U.S. patent application number 11/496563 was filed with the patent office on 2008-01-31 for automatic elastomer extrusion apparatus and method.
This patent application is currently assigned to Schlumberger Technology Corporation. Invention is credited to Geoff Downton, Lawrence Lee.
Application Number | 20080023123 11/496563 |
Document ID | / |
Family ID | 38984950 |
Filed Date | 2008-01-31 |
United States Patent
Application |
20080023123 |
Kind Code |
A1 |
Downton; Geoff ; et
al. |
January 31, 2008 |
Automatic elastomer extrusion apparatus and method
Abstract
The present invention relates to an automatic elastomer
extrusion apparatus and method. An apparatus 400 for in-situ
extrusion of an elastomeric coating 410 on a profiled helical
surface 450 can include a template (100, 200) forming a gap between
the profiled helical surface 450 and an adjacent profiled helical
surface (102, 202) of a template (100, 200) itself to extrude an
elastomer therethrough. A tracking mechanism 302 and/or carriage
300 can allow a template to follow the contours of the profiled
helical surface 350. The apparatus can include means for providing
relative movement between the profiled helical surface and the
template. The apparatus (500, 600) can include a cleaning module
(502, 602), an adhesive application module (504, 604), an elastomer
deposition module (506, 606), and/or a curing module (508, 608).
Each module can further include a template (100, 200) and/or a
tracking mechanism 302.
Inventors: |
Downton; Geoff;
(Minchinhampton, GB) ; Lee; Lawrence; (Hardwicke,
GB) |
Correspondence
Address: |
SCHLUMBERGER OILFIELD SERVICES
200 GILLINGHAM LANE, MD 200-9
SUGAR LAND
TX
77478
US
|
Assignee: |
Schlumberger Technology
Corporation
|
Family ID: |
38984950 |
Appl. No.: |
11/496563 |
Filed: |
July 31, 2006 |
Current U.S.
Class: |
156/98 ;
156/244.11; 425/11 |
Current CPC
Class: |
B29C 48/154 20190201;
B29C 48/09 20190201; B29C 35/02 20130101; B29C 48/13 20190201; B29C
48/152 20190201; B29C 2035/0827 20130101 |
Class at
Publication: |
156/98 ;
156/244.11; 425/11 |
International
Class: |
B32B 43/00 20060101
B32B043/00 |
Claims
1. An apparatus for extruding an elastomeric coating on a profiled
helical surface comprising: a template having a surface spaced
relative to the profiled helical surface to create a gap
therebetween; a source of an elastomer in communication with the
gap; means for extruding the elastomer through the gap; and at
least one tracking mechanism connected to the template and retained
against the profiled helical surface.
2. The apparatus of claim 1 wherein the profiled helical surface is
an interior surface of a stator.
3. The apparatus of claim 1 wherein the profiled helical surface is
an exterior surface of a rotor.
4. The apparatus of claim 1 further comprising means for providing
relative axial movement between the profiled helical surface and
the template.
5. The apparatus of claim 1 wherein the at least one tracking
mechanism is at least one wheel.
6. The apparatus of claim 5 further comprising a drive apparatus
connected to the at least one wheel.
7. The apparatus of claim 1 further comprising: means for removing
a pre-existing elastomeric coating from the profiled helical
surface; means for applying an adhesive on the profiled helical
surface; and means for curing the elastomeric coating.
8. The apparatus of claim 7 further comprising means for providing
relative movement between the profiled helical surface and the
apparatus.
9. The apparatus of claim 7 further comprising means for providing
relative movement between the profiled helical surface and each of
the template and the respective means for removing, applying, and
curing.
10. An apparatus for extruding an elastomeric coating on a profiled
helical surface comprising: a carriage disposed adjacent the
profiled helical surface; a cleaning module, an adhesive
application module, an elastomer deposition module comprising a
template having a surface spaced relative to the profiled helical
surface to create a gap therebetween and a source of an elastomer
in communication with the gap, and a curing module each disposed on
the carriage; and a traversal apparatus connected to the carriage
for traversing the profiled helical surface.
11. The apparatus of claim 10 wherein the elastomer deposition
module further comprises means for extruding the elastomer through
the gap.
12. The apparatus of claim 10 wherein the elastomer deposition
module further comprises at least one displacement servo to
maintain an orientation of the template relative to the profiled
helical surface.
13. The apparatus of claim 10 wherein the carriage further
comprises at least one displacement servo to maintain an
orientation of an assembly of the modules relative to the profiled
helical surface.
14. The apparatus of claim 10 wherein the adhesive application
module further comprises: a second template having a surface spaced
relative to the profiled helical surface to create a second gap;
and a source of an adhesive in communication with the second
gap.
15. The apparatus of claim 14 wherein the adhesive application
module further comprises at least one displacement servo to
maintain an orientation of the second template relative to the
profiled helical surface.
16. The apparatus of claim 10 wherein the cleaning module is
disposed adjacent a first end of the carriage and the curing module
adjacent a second end of the carriage, the adhesive application
module being disposed adjacent the cleaning module and the
elastomer deposition module being disposed between the adhesive
application module and the curing module.
17. The apparatus of claim 10 wherein the traversal apparatus
comprises at least one tracking mechanism retained against the
profiled helical surface.
18. The apparatus of claim 17 wherein the carriage is rotatable
about a longitudinal axis of the profiled helical surface.
19. The apparatus of claim 17 further comprising a rotational drive
apparatus connected to the profiled helical surface to rotate the
profiled helical surface during deposition of an elastomer.
20. The apparatus of claim 19 wherein the traversal apparatus
further comprises a guide connected to the carriage and following
at least one track extending in a straight line parallel to a
longitudinal axis of the profiled helical surface as the profiled
helical surface is rotated relative to the at least one track.
21. The apparatus of claim 10 wherein the carriage comprises a
plurality of interconnected circular body members retained coaxial
to a longitudinal axis of the profiled helical surface by a
plurality of tracking mechanisms retained against the profiled
helical surface and circumferentially mounted on the plurality of
circular body members.
22. The apparatus of claim 10 wherein the traversal apparatus
comprises at least one wheel resiliently held against the profiled
helical surface.
23. The apparatus of claim 22 further comprising a drive apparatus
connected to the at least one wheel to drive the carriage along the
profiled helical surface.
24. A method of extruding an elastomeric coating on a profiled
helical surface comprising: providing a template having a surface
spaced relative to the profiled helical surface to create a gap
therebetween, the gap in communication with a source of an
elastomer; extruding the elastomer on the profiled helical surface
through the gap; and providing relative movement between the
profiled helical surface and the template, the template tracking
the profiled helical surface with at least one wheel retained
against the profiled helical surface.
25. The method of claim 24 wherein the step of providing relative
movement comprises powering a drive apparatus connected to the at
least one wheel.
26. A method of extruding an elastomeric coating on a profiled
helical surface comprising: disposing a carriage with a cleaning
module, an adhesive application module, an elastomer deposition
module, and a curing module mounted thereto along the profiled
helical surface; removing a pre-existing elastomeric coating with
the cleaning module from a section of the profiled helical surface
as the carriage is disposed along the profiled helical surface;
applying an adhesive with the adhesive application module on the
section of the profiled helical surface where the pre-existing
elastomeric coating has been previously removed by the cleaning
module; extruding an elastomer through a gap formed between a
template of the elastomer deposition module and the profiled
helical surface on the section of the profiled helical surface
where the pre-existing elastomeric coating has been previously
removed with the cleaning module and the adhesive has been
previously applied with the adhesive application module; and curing
the elastomeric coating with the curing module on the section of
the profiled helical surface where the cleaning, adhesive
application, and elastomer deposition modules have previously
removed the pre-existing elastomeric coating, applied the adhesive,
and deposited the elastomeric coating.
27. The method of claim 26 further comprising positioning the
template with at least one tracking mechanism connected to the
template and retained against the profiled helical surface.
28. The method of claim 26 further comprising positioning the
template with at least one displacement servo disposed between the
template and the carriage.
29. The method of claim 26 wherein each of the cleaning, applying,
extruding, and curing steps occur concurrently.
30. The method of claim 26 further comprising providing relative
movement between the carriage and the profiled helical surface
during the cleaning, applying, extruding, and curing steps.
31. The method of claim 26 further comprising providing relative
movement between the carriage and each of the cleaning module, the
adhesive application module, the elastomer deposition module, and
the curing module during the cleaning, applying, extruding, and
curing steps.
32. The method of claim 26 further comprising: connecting a guide
to the carriage, the guide following at least one track extending
in a straight line parallel to an axis of the profiled helical
surface; connecting at least one tracking mechanism to the
carriage, the at least one tracking mechanism retained against the
profiled helical surface; and imparting relative rotation between
the profiled helical surface and the carriage to drive the carriage
along the track and the profiled helical surface.
Description
BACKGROUND
[0001] The invention relates generally to extruding an elastomer.
More particularly, the invention relates to an automatic elastomer
extrusion apparatus and a method for extruding an elastomer onto a
rotor or inside a stator of a progressive cavity motor or pump.
[0002] Progressive cavity pumps or motors, also referred to as a
progressing cavity pumps or motors, typically include a power
section consisting of a rotor with a profiled helical exterior
surface disposed within a stator with a profiled helical interior
surface. The rotor and stator of a progressive cavity apparatus
operate according to the Moineau principle, originally disclosed in
U.S. Pat. No. 1,892,217.
[0003] In use as a pump, relative rotation is provided between the
stator and rotor by any means known in the art, and a portion of
the profiled helical exterior surface of the rotor engages the
profiled helical interior surface of the stator to form a set of
sealed chambers or cavities. As the rotor turns eccentrically
within the stator, the cavities progress axially to move any fluid
present in the cavities.
[0004] In use as a motor, a fluid source is provided to the
cavities formed between the rotor and stator. The pressure of the
fluid causes the cavities to progress resulting in relative
rotation between the stator and rotor. In this manner fluidic
energy can be converted into mechanical energy.
[0005] As progressive cavity pumps or motors rely on a seal between
the stator and rotor surfaces, one of or both of these surfaces
preferably includes a resilient or dimensionally forgiving
material. Typically, the resilient material has been a layer of
elastomer disposed on the profiled helical interior surface of the
stator, but can be disposed on the profiled helical exterior
surface of the rotor. The stator and rotor are typically made of
steel.
[0006] In use, the heat and stress encountered can cause cracking
and other wear of the elastomer. A hydrocarbon or other caustic
fluid can cause degradation of the elastomer. Regardless of the
cause, it can be desirable to replace or otherwise automatically
extrude a layer of elastomer on a profiled helical surface.
SUMMARY OF THE INVENTION
[0007] The present invention relates to a method and apparatus for
extruding an elastomeric coating on a profiled helical surface or
redressing a pre-existing elastomeric coating. An apparatus can
include a template having a surface spaced relative to the profiled
helical surface to create a gap therebetween, a source of an
elastomer in communication with the gap, and at least one tracking
mechanism connected to the template and retained against the
profiled helical surface. The tracking mechanism can be resiliently
held against, or otherwise fixed into contact with, the profiled
helical surface. The apparatus can include means for extruding the
elastomer through the gap. The apparatus can include means for
providing relative movement between the profiled helical surface
and the template. The movement can be axial and/or rotational. The
at least one tracking mechanism can be at least one wheel. A drive
apparatus can be connected to the at least one wheel. The profiled
helical surface can be an interior surface of a stator or an
exterior surface of a rotor. The apparatus can further include
means for removing a pre-existing elastomeric coating from the
profiled helical surface, means for applying an adhesive on the
profiled helical surface, and/or means for curing the elastomeric
coating. The apparatus can include means for providing relative
movement between the profiled helical surface and the apparatus or
for providing relative movement between the profiled helical
surface and each of the template and the respective means for
removing, applying, and curing.
[0008] In another embodiment, an apparatus for extruding an
elastomeric coating on a profiled helical surface can include a
carriage disposed adjacent the profiled helical surface, a cleaning
module, an adhesive application module, an elastomer deposition
module including a template having a surface spaced relative to the
profiled helical surface to create a gap therebetween and a source
of an elastomer in communication with the gap, and a curing module
each disposed on the carriage, and a traversal apparatus connected
to the carriage for traversing the profiled helical surface.
[0009] The elastomer deposition module can include means for
extruding the elastomer through the gap. The elastomer deposition
module can include at least one displacement servo to maintain an
orientation of the template relative to the profiled helical
surface. The carriage can include at least one displacement servo
to maintain an orientation of an assembly of the modules relative
to the profiled helical surface. The adhesive application module
can include a second template having a surface spaced relative to
the profiled helical surface to create a second gap, and a source
of an adhesive in communication with the second gap. The adhesive
application module can include at least one displacement servo to
maintain an orientation of the second template relative to the
profiled helical surface.
[0010] The cleaning module can be disposed adjacent a first end of
the carriage and the curing module adjacent a second end of the
carriage, the adhesive application module can be disposed adjacent
the cleaning module and the elastomer deposition module can be
disposed between the adhesive application module and the curing
module. The traversal apparatus can include at least one tracking
mechanism resiliently held against the profiled helical surface.
The carriage can be rotatable about a longitudinal axis of the
profiled helical surface. The apparatus can include a rotational
drive apparatus connected to the profiled helical surface to rotate
the profiled helical surface during deposition of an elastomer.
[0011] The traversal apparatus can include a guide connected to the
carriage and following at least one track extending in a straight
line parallel to a longitudinal axis of the profiled helical
surface as the profiled helical surface is rotated relative to the
at least one track. The traversal apparatus can include a drive
apparatus connected to the carriage to drive the carriage along the
profiled helical surface and/or at least one wheel resiliently held
against the profiled helical surface. A drive apparatus can be
connected to the at least one wheel to drive the carriage along the
profiled helical surface.
[0012] In another embodiment, a method of extruding an elastomeric
coating on a profiled helical surface can include providing a
template having a surface spaced relative to the profiled helical
surface to create a gap therebetween, the gap in communication with
a source of an elastomer, extruding the elastomer on the profiled
helical surface through the gap, and providing relative movement
between the profiled helical surface and the template, the template
tracking the profiled helical surface with at least one wheel
resiliently held against the profiled. helical surface. The
relative movement can be provided by powering a drive apparatus
connected to the at least one wheel.
[0013] In yet another embodiment, a method of extruding an
elastomeric coating on a profiled helical surface can include
disposing a carriage with a cleaning module, an adhesive
application module, an elastomer deposition module, and a curing
module mounted thereto along the profiled helical surface, removing
a pre-existing elastomeric coating with the cleaning module from a
section of the profiled helical surface as the carriage is disposed
along the profiled helical surface, applying an adhesive with the
adhesive application module on the section of the profiled helical
surface where the pre-existing elastomeric coating has been
previously removed by the cleaning module, extruding an elastomer
through a gap formed between a template of the elastomer deposition
module and the profiled helical surface on the section of the
profiled helical surface where the pre-existing elastomeric coating
has been previously removed with the cleaning module and the
adhesive has been previously applied with the adhesive application
module, and curing the elastomeric coating with the curing module
on the section of the profiled helical surface where the cleaning,
adhesive application, and elastomer deposition modules have
previously removed the pre-existing elastomeric coating, applied
the adhesive, and deposited the elastomeric coating. The method can
include positioning the template with at least one tracking
mechanism connected to the template and resiliently held against
the profiled helical surface. The template can be positioned with
at least one displacement servo disposed between the template and
the carriage.
[0014] The cleaning, applying, extruding, and curing steps can
occur concurrently to a different portion of the rotar/stator.
Relative movement can occur between the carriage and the profiled
helical surface during the cleaning, applying, extruding, and
curing steps. The method can include providing relative movement
between the carriage and each of the cleaning module, the adhesive
application module, the elastomer deposition module, and the curing
module during the cleaning, applying, extruding, and curing
steps.
[0015] The method can also include connecting a guide to the
carriage, the guide following at least one track extending in a
straight line parallel to an axis of the profiled helical surface,
connecting at least one tracking mechanism to the carriage, the at
least one tracking mechanism resiliently held against the profiled
helical surface, and imparting relative rotation between the
profiled helical surface and the carriage to drive the carriage
along the track and the profiled helical surface.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is a perspective view of a template for use with a
rotor, according to one embodiment of the invention.
[0017] FIG. 2 is a perspective view of a template for use in a
stator, according to one embodiment of the invention.
[0018] FIG. 3A is a perspective view of a carriage with multiple
tracking mechanisms, according to one embodiment of the
invention.
[0019] FIG. 3B is a perspective view of the carriage of FIG. 3A
disposed on a profiled helical surface.
[0020] FIG. 4 is a perspective view of the extrusion of an
elastomer on a profiled helical surface using the template of FIG.
1, according to one embodiment of the invention.
[0021] FIG. 5 is a schematic view of an automatic elastomer
depositing apparatus disposed on a rotor, according to one
embodiment of the invention.
[0022] FIG. 6 is a schematic cross-sectional view of an automatic
elastomer depositing apparatus disposed in the profiled helical
bore of a stator, according to one embodiment of the invention.
[0023] FIG. 7 is a perspective view of a carriage disposed along a
track by the rotation of the profiled helical surface, according to
one embodiment of the invention.
[0024] FIG. 8 is a perspective view of a template movably attached
to a carriage by a plurality of displacement servos, according to
one embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
[0025] FIG. 1 illustrates one embodiment of a template 100, for use
in extruding a layer of elastomer onto a profiled helical surface.
The term profiled shall refer to a non-circular cross-section, for
example, a lobed or corrugated cross-section of a rotor (FIG. 5) or
a stator (FIG. 6) for use as a power section of a progressive
cavity apparatus. The term template, as used herein, shall refer to
an element having at least one profiled interior or exterior
surface, which can be a helical surface, with a shape substantially
similar to that of an adjacent profiled helical surface. The shape
of the template can permit a gap between a profiled surface of the
template and the adjacent profiled helical surface to be coated. A
template can be disposed around an exterior profiled helical
surface, for example the exterior surface of the rotor in FIG. 5,
or disposed within an interior profiled helical surface, for
example the interior surface of the stator in FIG. 6. The gap can
be circumferential to the profiled helical surface, for example, a
tube.
[0026] The template in FIG. 1 has an aperture 102 that is sized and
profiled respective to the profiled, or lobed, helical surface onto
which the elastomer can be deposited (see FIG. 4), to create the
desired thickness and/or orientation of elastomeric coating. For
example, with a profiled helical surface, the aperture 102 can have
a profiled helical shape (see 102 in FIG. 1) or have a profiled
linear shape (not shown). Although the template 100 is shown with a
circular outer perimeter, it can be any shape. The template 100 can
be of any thickness desired. The template can include a heat source
to aid in the extrusion process.
[0027] To use, the template 100 is disposed adjacent to a profiled
helical surface, for example, the exterior surface of a rotor. In a
typical die for extruding an elastomeric tube, the extrusion gap is
formed between a mandrel and a land (also referred to as a die
aperture or bearing) in the cap of the die itself. An example of a
profiled helical tube formed by extrusion is found in (SCH-10/Ref.
No. 92.1101,), herein incorporated by reference. The present
invention allows a gap to be formed between the exterior surface of
a rotor (or interior surface of a stator with a template as shown
in FIG. 2) and the template 100. Thus, the surface of a rotor or
stator can be used as a substitute to the mandrel or land of the
extrusion die. The gap is typically oriented such that it is
continuous around the circumference. Thus a thick or relatively
thin layer of elastomer can be extruded onto the profiled helical
surface. Due to the viscous nature of an elastomer, it cannot
typically be spray deposited. However, an elastomer can be extruded
through this gap and onto the profiled helical surface to form the
elastomeric coating. Means for extruding the elastomer through the
gap can include a hydraulic or mechanical press, for example, a
screw press, or any other extrusion power means known in the
art.
[0028] Relative movement between the template and rotor surface can
then be added to facilitate extrusion along the surface of the
stator. The profiled helical shape of the aperture 102 of the
template 100 permits a gap therebetween, and any elastomer extruded
therethrough, to be of uniform thickness due to the parallel
aperture and rotor surfaces. An optional adhesive can be applied to
the helical profiled surface before extrusion to aid in the
adhesion of the elastomeric coating by one or more spray nozzles,
template, and/or brushes. An optional cleaning step can remove any
pre-existing elastomeric coating and/or contaminants by chemical,
thermal, hydraulic, cutting, scraping, and/or abrasive action.
After extrusion, the elastomeric coating can then be cured by any
means known in the art, which can include using pressure, heat,
ultraviolet light, and/or the passage of time.
[0029] Similarly, if an elastomeric coating is to be formed on the
profiled helical interior surface of a stator, a template 200 with
an outer profiled helical surface 202 such as in FIG. 2 can be
utilized. The outer surface 202 of the template 200 can be sized
and profiled respective to the profiled helical surface onto which
the elastomer can be deposited. The outer surface 202 of the
template 200 can be helical, as shown, to allow the gap
therebetween, and thus any elastomer extruded therethrough, to be
of uniform thickness. To use, the template 200 is disposed within
the bore of a stator. As above, an elastomer can then be extruded
through the gap formed therebetween to form the elastomeric
coating.
[0030] To allow the template (100, 200), to follow the helical
pattern of the profiled surface, a tracking mechanism can be used.
A tracking mechanism can be retained into contact with the profiled
helical surface or can be resiliently held against the profiled
helical surface, of a stator or rotor for example. The resilient
force can be through a wheel constructed of a resilient material,
for example, urethane, or by adding a shock absorbing member to the
tracking mechanism. A plurality of tracking mechanisms can be used.
A tracking mechanism allows the template, or carriage, to follow
the contours of the profiled helical surface as relative movement
is imparted between the template and profiled helical surface.
[0031] In a preferred embodiment, the longitudinal axis of the
template and the longitudinal axis of the profiled helical surface
remain concentric during the relative movement therebetween. A
tracking mechanism can be a wheel, track, or skid, for example. A
tracking mechanism can ride in the valley between each lobe of the
profiled surface (see FIG. 3B) to follow the helical pattern. A
tracking mechanism can include a wheel with the outer surface
shaped as a channel. This incurvate channel can allow the wheel to
ride along the apex of a lobe of the profiled helical surface. To
aid in positioning the template with respect to the profiled
helical surface, at least one displacement servo can be attached to
the template to correct any positioning errors to maintain a
desired or preferred orientation. The displacement servo can be
disposed between a template and the tracking mechanism. A plurality
of displacement servos can allow for three dimensional adjustment
of the template.
[0032] FIG. 3A illustrates a carriage 300 with a plurality of
tracking mechanisms (302, 302') mounted to each circular body
member (304, 304'). The circular body members (304, 304') can be
spaced further apart by using longer connecting members 306.
Although two circular body members (304, 304') are illustrated, any
means for mounting the tracking mechanisms (302, 302') to the
carriage 300 can be utilized. Similarly, any means for mounting a
tracking mechanism directly to a template (100, 200) can be used.
FIG. 3B illustrates the plurality of tracking mechanisms (302,
302') retained against a profiled helical surface 350 of a rotor,
for example. A tracking mechanism (302, 302') can be resiliently
held against the profiled helical surface if so desired by any
means known in the art. A single tracking mechanism can be-attached
directly to a template (100, 200) itself, and does not require the
use of a carriage 300 as shown in FIGS. 3A-3B. Although illustrated
as tracking an exterior profiled helical surface 350 (for example,
with template 100), the tracking mechanisms (302, 302') can be
utilized with a stator template 200. In such a configuration, the
tracking mechanism can be mounted such that they contact the
interior profiled helical surface. For example, the wheels (302,
302') can be mounted on the exterior of the carriage 300 and/or
template and the carriage and/or template disposed within the bore
of the stator. Although four adjacent tracking mechanisms (302,
302') are shown on each circular body member (304, 304') of the
carriage 300, four are not required. The number of members used can
depend on the number of lobes of the profiled helical surface
and/or the amount of support needed, for example, a single member
can be used if substantially all of the weight of the template is
supported by other means. Similarly, the number of tracking
mechanism used can depend on the amount of support needed and/or
the number of lobes of the profiled helical surface and is not
limited to sets of four as shown in the Figures.
[0033] A carriage 300 can also allow for the mounting of a cleaning
module, an adhesive application module, an elastomer deposition
module, and/or a curing module, as discussed in reference to FIGS.
5-6. Each module can include a template, for example, the elastomer
deposition module can include a template and a source of an
elastomer in communication with the gap formed between the template
and the profiled helical surface to be coated.
[0034] A tracking mechanism can include a drive apparatus, for
example, the drive apparatus can be connected to a wheel to advance
the tracking mechanism, and thus any template connected thereto,
along the profiled helical surface.
[0035] Referring now to FIG. 4, one apparatus for extruding an
elastomeric coating is shown. The extruder module 400 includes a
source of elastomer (not shown), which can be a hydraulic or
mechanical press, in communication with a gap formed between an
aperture 102 of the template 100 and the exterior surface of the
rotor 450.
[0036] In use, a profiled helical surface, for example, a rotor
450, is disposed within the profiled helical aperture 102 of the
template 100 to allow in-situ extrusion of an elastomer. The
profiled helical aperture 102 and the profiled helical exterior
surface of the rotor 450 are design adjustable to create a gap
therebetween. This gap can be of uniform or varying thickness
around the circumference, as is known in the art. An elastomer can
then be extruded through the gap by any means know in the art. A
supply of elastomer can be carried by the extrusion means itself,
for example, a double screw press, or supplied by umbilical to the
extrusion means. The gap can be substantially the thickness of the
formed elastomeric coating 410 if the elastomer retains its as
extruded dimensions after curing, if required.
[0037] Relative movement can then be provided between the template
100 and the rotor 450 during extrusion to permit the template to
track the rotor's 450 helical surface, and accordingly coat the
rotor with a desired thickness of elastomeric coating 410. The
rotor 450 can be coated with an adhesive prior to extrusion to aid
in the adhesion of the elastomeric coating 410 to the profiled
helical surface. Relative movement can be imparted by mechanical or
electromagnetic force applied to one or both of the profiled
helical surface 450 and template 100, for example, a template
and/or a rotor can be moved by driving a wheel or set of wheels
connected to the template and resiliently held against the rotor
surface along the helical pattern of the rotor. By disposing at
least one tracking mechanism substantially parallel to the path
formed by a lobe or valley of the profiled helical surface, at
least one tracking mechanism, for example a wheel, can be powered
to create the relative movement between template and rotor, for
example. A wheel can have an outer surface that allows for traction
between the wheel and the rotor surface, which is typically smooth
steel.
[0038] If primarily relative axial movement between the
longitudinal axis of the rotor 450 and the longitudinal axis of the
template 100, as defined by the helix of each, is imparted,
rotation of the template 100 about the longitudinal axis of the
rotor 450 can also be added to permit the template 100 to track the
helical pitch of the rotor 450. The relative axial movement can be
achieved by powered means, for example an electric motor rotating
the template and/or rotor, or unpowered means, for example at least
one tracking mechanism immovably, but can be adjustable, connected
to the template to tracks the surface of the rotor, but allowing
for movement between the profiled helical surface and the tracking
mechanism, for example, the rotation of a wheel. Due to the helical
pattern, the tracking mechanism can serve as a guide to allow the
template to rotate about the axis of the rotor, or stator, as
relative axial movement is imparted between the template and rotor,
or stator.
[0039] Relative axial movement can be achieved by mechanical or
electrical means, for example, by powering a drive wheel against a
surface, said surface not limited to the profiled helical surface
but can be, for example, a planar surface extending substantially
parallel to the longitudinal axis of the rotor.
[0040] Referring again to FIG. 4, at least one tracking mechanism
(not shown) can be used to allow the template 100 to track the
profiled helical surface of the rotor 450 during relative movement
therebetween. The rate of relative movement between the adjacent
template 100 and rotor 450 surfaces can depend on the extrusion
rate and/or the desired thickness of elastomer 410 to be formed.
Similarly, the rate of extrusion can be modified to correspond to a
desired rate of traversal and/or thickness of elastomer 410. After
deposition of the elastomer 410, a section of, or the entirety of,
the elastomeric coated rotor 410 can be cured in-situ, or placed in
an oven or other curing device. Relative movement can also be
achieved through the use of an optional rotational drive apparatus,
guide, and track assembly as discussed in reference to FIG. 5. A
rotor is used for exemplary purposes, a stator or any other
profiled helical surface can be coated with elastomer without
departing from the spirit of the invention.
[0041] Although FIG. 4 illustrates extruding a layer of elastomer
on the exterior surface of a rotor 450, the interior surface of a
stator, as shown in FIG. 6, can be coated with an elastomer without
departing from the spirit of the invention, for example, by
extruding an elastomer using the template of FIG. 2. In the stator
embodiment, relative axial movement can be achieved by mounting
template to a rod and disposing the rod through the bore of the
stator. In such an embodiment, it can be desirable to add a
rotational apparatus, for example roller bearings, between the
template and the rod to allow rotation between the rod and the
template. This enables the rod to be disposed axially through the
bore while the tracking member tracks the profiled helical surface
and imparts rotation to the template. Further, relative movement
can be imparted between the stator bore and the template by driving
a tracking mechanism, as disclosed in reference to FIG. 4.
[0042] FIG. 5 illustrates one embodiment of an apparatus for
redressing a profiled helical surface having a pre-existing
elastomeric coating. An automatic elastomer depositing apparatus
500 is shown disposed over the profiled helical exterior surface of
a rotor 550. The rotor is shown with a pre-existing elastomeric
coating 501 formed on the profiled helical surface of the rotor 550
with dotted lines indicating the profiled helical exterior surface
of the rotor 550. The automatic elastomer depositing apparatus 500
can include a cleaning module 502, an adhesive application module
504, an elastomer deposition module 506, and a curing module 508. A
module (502, 504, 506, 508) can have an active surface that is
fully disposed around the circumference of the rotor 550 or that is
point focused and rotated around the longitudinal axis of the rotor
550 to allow for use at any point on the circumference.
[0043] The cleaning module 502 can remove a pre-existing
elastomeric layer 501, if present, through any means known in the
art. The cleaning module 502 can clean any contaminants from the
exterior surface of the rotor 550, for example, rust or scale. The
cleaning module 502 can utilize heat, chemical, cutting, scraping,
and/or abrasive action.
[0044] The adhesive application module 504 can apply a thin
controlled layer of adhesive through any means known in the art, if
the use of adhesive is desired. For example, an adhesive
application module 504 can include one or more spray nozzles and/or
brushes. An adhesive application module 504 can include a template
to apply a desired thickness of adhesive. A source of adhesive can
be provided in communication with the template to dispense the
adhesive through the gap between the template and the profiled
helical surface. The source of adhesive can be carried by the
adhesive application module 504 itself or provided by an umbilical
as is known in the art. The umbilical can include a swivel
device.
[0045] The design and/or orientation of the template relative to
the profiled helical surface can control the geometry of the gap.
In a preferred embodiment for use with an exterior profiled helical
surface, such as the exterior surface of the rotor 550, a template
is designed with an aperture whose inner surface is spaced relative
to the circumference of the profiled helical surface to create a
gap therebetween. The gap can be of variable thickness, for
example, around the circumference or of uniform thickness, as is
known in the art. A template can have any shape of profiled
interior or exterior surface. A template can include a profiled
helical aperture (for use with a rotor) or exterior (for use with a
stator) surface or a profiled surface with a straight longitudinal
aperture or exterior surface. Any of the cleaning module 502, the
adhesive application module 504, the elastomer deposition module
506, and the curing module 508 can employ a template.
[0046] A template used with an exterior profiled helical surface
can have an inner aperture geometry that is relatively smaller than
the circumference of the rotor with an elastomeric coating (501,
509). A template thus can have radial slits or other elements to
allow the template to expand such that a module with a template,
for example the adhesive application module 504, can be removed
from the rotor 550.
[0047] To allow any module (502, 504, 506, 508), which can include
a template and/or a tracking mechanism, to traverse the profiled
helical surface, a traversal apparatus can be employed. A traversal
apparatus can allow axial and/or radial movement with respect to a
module (502, 504, 506, 508) and/or template and the profiled
helical surface. The profiled helical surface can be displaced, any
module (502, 504, 506, 508) can be displaced, or any combination
thereof.
[0048] A traversal apparatus can include a drive apparatus to
impart relative movement between the automatic elastomer depositing
apparatus 500 and the profiled helical surface and/or include a
tracking mechanism to allow the automatic elastomer depositing
apparatus 500 to track the profiled helical surface along the
helix. A wheel, skid, or a continuous belt can be used as a
tracking mechanism. The tracking mechanism can be resiliently held
against the profiled helical surface and connected to a module
(502, 504, 506, 508) and/or template. For example, if at least one
wheel is used as a tracking mechanism, the wheel can be retained
against any portion of the profiled helical surface to track the
profiled helical surface. A profiled helical surface typically
includes multiple lobes, with an apex of each lobe and a valley
between each lobe. A wheel, or plurality of wheels, can, for
example, be disposed in a valley and/or against an apex of a lobe.
When relative movement is imparted between the wheel and the
profiled helical surface, the wheel can track the profiled helical
surface. By connecting the wheel and/or other tracking mechanism to
a module (502, 504, 506, 508) and/or template, the module and/or
template can track the contours of the profiled helical surface as
the module and/or template is disposed down the axis of the
profiled helical surface. An apex of a lobe of a profiled helical
surface, for example the rotor 550, can thus remain adjacent a lobe
of a template with a profiled aperture, if utilized, during
movement of the profiled helical surface with respect to the
template. As the tracking mechanism, and any module (502, 504, 506,
508) and/or template connected thereto, is disposed along the axis
of the profiled helical surface, the tracking mechanism follows the
contours of the profiled helical surface by rotating at the same
pitch of the profiled helical surface. This can allow the gap to
remain uniform with respect to the full length of the profiled
helical surface as a module (502, 504, 506, 508) and/or template is
disposed along the surface of the profiled helical surface.
[0049] As a module (502, 504, 506, 508) and/or template can be
susceptible to positioning errors with respect to a desired
alignment with the profiled helical surface, at least one
displacement servo can be utilized. A plurality of displacement
servos can allow independent radial movement with respect to each
module (502, 504, 506, 508), tracking mechanism, template, and/or
the profiled helical surface. A displacement servo can allow
precise control of the gap formed between a template and the
adjacent section of the profiled helical surface. The displacement
servo, for example, can be connected between a template, if used,
and a module (502, 504, 506, 508) or tracking mechanism.
[0050] The invention can also include an elastomer deposition
module 506 which deposits an elastomeric coating 507 on the
profiled helical surface. The means for depositing an elastomeric
coating 507 can include means for extrusion, one or more spray
nozzles and/or brushes, or any other means known in the art for
depositing an elastomeric coating. In a preferred embodiment, an
elastomer deposition module 506 includes at least one template, as
disclosed above and means for extruding an elastomer through the
gap. In an embodiment for use with a rotor 550, a template is
designed with an inner surface of an aperture that creates a
desired gap between the template and the profiled helical surface.
Any template can have a profiled helical or non-helical surface
without departing from the spirit of the invention. A source of an
elastomer is in communication with the gap and the elastomer is
extruded or otherwise disposed onto the profiled helical surface,
shown in FIG. 5 as an exterior surface of a rotor 550, through the
gap. The design of the gap can control the thickness of the
elastomeric coating 507. The gap, and consequentially the
elastomeric coating 507, can be of variable thickness or of uniform
thickness, as is known in the art. The source of elastomeric
coating can be carried by the elastomer deposition module 506
itself or provided by an umbilical as is known in the art. The
umbilical can include a swivel device.
[0051] The curing module 508 can apply heat, light, or otherwise
cure the elastomeric coating through any means know in the art. A
template can be utilized if desired to ensure uniform curing, for
example, uniform heat application through a profiled heating
coil.
[0052] In use, the automatic elastomer depositing apparatus 500 is
disposed against the profiled helical exterior surface of a rotor
550, which can have a pre-existing elastomeric coating 501.
Relative movement is then imparted between the automatic elastomer
depositing apparatus 500 and the profiled helical surface of the
rotor 550. The automatic elastomer depositing apparatus 500 can
allow movement of each respective module (502, 504, 506, 508) in
unison or individually. The relative movement can be imparted
through any type of traversal apparatus or traversal means.
[0053] During the relative movement, the cleaning module 502 can
remove any pre-existing elastomeric coating 501 and/or other
contaminants to expose the rotor surface 503. Adhesive can then be
applied to the cleaned rotor surface 503 with an adhesive
application module 504, which can include a template tracking the
profiled helical surface with at least one tracking mechanism. An
elastomeric coating 507 is then applied to the adhesive coated
surface 505 with the elastomer deposition module 506, which can
include a template tracking the profiled helical surface with at
least one tracking mechanism. The uncured elastomeric coating 507
can then be cured with the curing module 508, to create a rotor 550
with a cured elastomeric coating 509. Although the curing module
508 is illustrated in FIG. 2 as disposed totally within the bore of
the stator 650, this module can optionally include a component
located exterior to the stator 650. This exterior component can be
used to apply heat from the outside of the stator 650 or simply as
an insulating mechanism for controlling the temperature of the
portion of the stator 650 being processed.
[0054] The automatic elastomer depositing apparatus 500 can allow
any of the modules to be activated at any time. For example, all of
the modules (502, 504, 506, 508) can act on the profiled helical
surface concurrently. This can allow the redressing of an
elastomeric coating 509 with one pass of the automatic elastomer
depositing apparatus 500 along the profiled helical surface of the
rotor 550.
[0055] Any means known in the art can be utilized to provide
relative movement between any of the respective modules (502, 504,
506, 508) and the profiled helical surface of the rotor 550. The
means for providing relative movement can be a separate traversal
module for use in addition to the other modules (502, 504, 506,
508) or each respective module (502, 504, 506, 508) can include its
own respective traversal apparatus. To provide relative movement
between the modules (502, 504, 506, 508) and the profiled helical
surface of the rotor 550, a carriage can be employed. The carriage
can allow the mounting of any of the modules (502, 504, 506, 508)
in combination or alone. A plurality of carriages can be used
without departing from the spirit of the invention. A carriage can
be formed with a flexible connection between the modules (502, 504,
506, 508). A carriage can include at least one traversal apparatus,
for example, a drive apparatus and/or tracking mechanism to allow
the carriage to track the profiled helical surface. A drive
apparatus and/or tracking mechanism can be mounted anywhere on the
carriage and/or on the modules (502, 504, 506, 508). A drive
apparatus and/or tracking mechanism can form a separate module
which is attached to the carriage. A carriage embodiment is
preferably utilized with a profiled helical surface with a constant
pitch. If a carriage is used, a plurality of tracking mechanisms
can be employed to support the entire automatic elastomer
depositing apparatus 500 against the profiled helical surface.
[0056] In a preferred embodiment, at least one tracking mechanism
is disposed between the cleaning module 502 and the adhesive
application module 504 to allow the tracking mechanism to contact
the cleaned rotor surface 503. In a preference embodiment, the
configuration of tracking mechanisms shown in FIGS. 3A-B can be
disposed on the cleaned rotor surface 503 and connected to a
carriage. The use of two sets (304, 304' in FIG. 3A) of adjacent
tracking mechanisms can allow for increased stability, however, any
number of tracking mechanisms and/or sets of adjacent tracking
mechanisms can be used without departing from the spirit of the
invention.
[0057] The tracking mechanism, for example, a wheel, can include a
drive apparatus connected thereto to drive the cleaning module
along the profiled helical surface. The tracking mechanism can be
attached to a template, if present. A traversal apparatus can
include a separate drive mechanism to propel the traversal
apparatus with respect to the profiled helical surface independent
of the presence of a tracking mechanism. A traversal apparatus can
include any means to provide relative axial and/or radial
movement.
[0058] A carriage is not required and relative movement can be
imparted to each module (502, 504, 506, 508) with respect to the
profiled helical surface of the rotor 550, independent of the other
modules. For example a module (502, 504, 506, 508) can include its
own respective traversal apparatus, for example, a tracking
mechanism and/or drive apparatus. Each respective tracking
mechanism can have a drive apparatus which is connected to the
tracking mechanism, for example, a wheel, to provide relative
movement between the module (502, 504, 506, 508) and the profiled
helical surface. Each module can have a differing rate of
traversal. The physical gap between the modules, independent of the
use of a carriage, and/or speed at which the automatic elastomer
depositing apparatus 500 functions can be dependent upon the
traction of the means for relative movement, the speed at which
each module can be moved, the cleaning, adhesive application,
elastomeric coating deposition, and curing process times, amount of
radiated heat during the curing process, and/or vibration. Each
module (502, 504, 506, 508) can be moved independently or in a
coordinated movement with the other modules depending on the
desired rate of traversal for each respective module. If a carriage
is used, the carriage can be moved at a rate equal to the rate of
the slowest traversing module (502, 504, 506, 508).
[0059] An optional rotational drive apparatus can allow rotation of
the profiled helical surface, for example about a longitudinal
axis. If an optional rotational drive apparatus is used, a
traversal apparatus can include at least one track extending in a
straight line parallel to the longitudinal axis of the profiled
helical surface. A guide is provided to follow the track, with the
guide being attached to a carriage or a module (502, 504, 506,
508). A carriage or a module (502, 504, 506, 508) can include a
tracking mechanism, for example a wheel. As the profiled helical
surface, for example the rotor 550, is rotated about the axis, a
tracking mechanism follows the contours of the profiled helical
surface. By connecting the tracking mechanism to a guide which
follows a straight line track, the rotation of the profiled helical
surface is translated into axial movement of the carriage or module
(502, 504, 506, 508) to which the tracking mechanism and guide are
attached, similar to a threaded connection advancing against
another threaded connection, for example, the interaction of a nut
and bolt.
[0060] Each module (502, 504, 506, 508) of the automatic elastomer
depositing apparatus 500 can compete its respective process on a
desired section of profiled helical surface before activating the
next respective module. For example, the entire profiled helical
surface of the rotor 550 can be cleaned with the cleaning module
502, then the adhesive application module 504 can apply a coating
of adhesive on the entire profiled helical surface of the rotor
550, the elastomer deposition module 506 can then deposit an
elastomeric coating on the entire profiled helical surface of the
rotor 550, and the curing module 508 can cure the entire profiled
helical surface of the rotor 550.
[0061] The invention can include the removing, applying,
depositing, and curing steps in the same axial direction along the
profiled helical surface. The invention can include removing,
applying, depositing, and curing in a reciprocating manner, for
example, one module (502, 504, 506, 508) acting from a first end of
the rotor 550 to the opposing second end of the rotor 550, and a
second module acting from the second end to the first end. Either
of these embodiments preferably include means to traverse the
profiled helical surface in two opposing directions.
[0062] Referring now to FIG. 6, an automatic elastomer depositing
apparatus 600 is shown disposed within the profiled helical
interior surface of a stator 650. The automatic elastomer
depositing apparatus 600 can be used for redressing a profiled
helical surface having a pre-existing elastomeric coating 601. The
automatic elastomer depositing apparatus 600 illustrated includes a
cleaning module 602, an adhesive application module 604, an
elastomer deposition module 606, and a curing module 608, as
discussed in reference to FIG. 5.
[0063] The cleaning module 602 can remove a pre-existing
elastomeric layer 601, if present, through any means known in the
art. The cleaning module 602 can clean any contaminants from the
interior profiled helical surface of the stator 650, for example,
rust or scale. The cleaning module 602 can utilize heat, chemical,
cutting, scraping, and/or abrasive action. As a stator body is
typically a bore, the cleaning module 602 can also include means
for removing the cleaning residue and/or removed portions of
pre-existing elastomeric coating 601, for example, a vacuum
device.
[0064] The adhesive application module 604 can apply a thin
controlled layer of adhesive through any means known in the art, if
the use of adhesive is desired. For example, an adhesive
application module 604 can include one or more spray nozzles and/or
brushes. An adhesive application module 604 can include a template
to apply a desired thickness of adhesive therebetween. A source of
adhesive can be provided in communication with the template to
dispense the adhesive through a gap between the template and the
profiled helical surface of the stator 650. The source of adhesive
can be carried by the adhesive application module 604 itself or
provided by an umbilical as is known in the art. The umbilical can
include a swivel device.
[0065] In contrast to the template disclosed in reference to FIG.
5, when used on a profiled helical interior surface of a stator 650
as in FIG. 6, a template can have an outside surface that
preferably is profiled. The design and/or orientation of the
template relative to the profiled helical surface can control the
geometry of the gap. In a preferred embodiment for use on a
profiled helical interior surface, such as a stator 650, a template
is designed with an outer surface spaced relative to the
circumference of the bore of the profiled helical surface to create
a gap therebetween. The gap can be of variable thickness or of
uniform thickness, as is known in the art.
[0066] As the bore of a stator is a profiled helical surface, it
can be desirable to allow a module (602, 604, 606, 608), which can
include a template, to track the profiled helical surface with at
least one tracking mechanism. A tracking mechanism can include, for
example, a wheel, skid, or a continuous belt. The tracking
mechanism can be resiliently held against the profiled helical
surface and connected to a module (602, 604, 606, 608) and/or
template. For example, if at least one wheel is used as the
tracking mechanism, it can be resiliently held against any portion
of the profiled helical surface and can track the profiled helical
surface. A profiled helical surface typically includes multiple
lobes, with an apex of each lobe and a valley between each lobe. A
wheel, or plurality of wheels, can be disposed in a valley and/or
against an apex of a lobe, for example. When relative movement is
imparted between the wheel and the profiled helical surface, the
wheel can track the profiled helical surface. By connecting the
wheel or other tracking mechanism to a module (602, 604, 606, 608)
and/or template, the module and/or template can track the contours
of the profiled helical surface as the module and/or template is
disposed down the axis of the profiled helical surface. An apex of
a lobe of a profiled helical surface, for example the stator 650,
can thus remain adjacent a lobe of a template with a profiled outer
surface, if utilized, during movement of the profiled helical
surface with respect to the template. This can allow the gap
therebetween to remain of uniform configuration along the length of
the axis as a module (602, 604, 606, 608) and/or template is
disposed along the profiled helical surface.
[0067] As a module (602, 604, 606, 608) and/or template can be
susceptible to positioning errors with respect to a desired
alignment with the profiled helical surface of the stator 650, at
least one displacement servo can be utilized. A plurality of
displacement servos can allow independent radial movement with
respect to each module (602, 604, 606, 608), tracking mechanism,
template, and/or the profiled helical surface. If a template is
utilized, at least one displacement servo can allow precise control
of the gap formed between the template and the adjacent section of
the profiled helical surface. A displacement servo, for example,
can be connected between a template, if used, and a module (602,
604, 606, 608) or tracking mechanism.
[0068] The invention can also include an elastomer deposition
module 606 which deposits an elastomeric coating 607 on the
profiled helical surface. The means for depositing an elastomeric
coating can include means for extruding elastomer, one or more
spray nozzles and/or brushes, or any other means known in the art
for depositing an elastomeric coating. In a preferred embodiment,
an elastomer deposition module 606 includes at least one template
and means for extruding an elastomer through the gap. In the
embodiment used in a stator 650, a template is designed with an
outer surface that creates a desired gap between the template and
the profiled helical surface of the stator 650. The template can
have a profiled helical or non-helical surface without departing
from the spirit of the invention. A source of an elastomer is in
communication with the gap and the elastomer is extruded or
otherwise disposed onto the profiled helical surface, shown in FIG.
6 as an interior surface of a stator 650, through the gap. The
design of the gap can control the thickness of the elastomeric
coating 607.
[0069] The curing module 608 can include means for applying heat,
light, or otherwise cure the elastomeric coating 607 by any means
know in the art. A template can be utilized if desired to ensure
uniform curing, for example, uniform heat application through a
profiled heating coil.
[0070] In use, the automatic elastomer depositing apparatus 600 is
disposed against the profiled helical interior surface of a stator
650, which can have a pre-existing elastomeric coating 601.
Relative movement is then imparted between the automatic elastomer
depositing apparatus 600 and the profiled helical surface of the
stator 650. The automatic elastomer depositing apparatus 600 can
allow movement of each respective module (602, 604, 606, 608) in
unison or individually. The relative movement can be imparted
through any type of traversal apparatus or traversal means.
[0071] During the relative movement, the cleaning module 602 can
remove any pre-existing elastomeric coating 601 and/or other
contaminants to expose the stator interior surface 603. Adhesive
can then be applied to the cleaned stator interior surface 603 with
an adhesive application module 604, which can include a template
tracking the profiled helical surface with at least one tracking
mechanism. An elastomeric coating 607 is then applied to the
adhesive coated surface 605 with the elastomer deposition module
606, which can include a template tracking the profiled helical
surface with at least one tracking mechanism. The uncured
elastomeric coating 607 can then be cured with the curing module
608, to create a stator 650 with a cured elastomeric coating
609.
[0072] A carriage can allow the mounting of any of the modules
(602, 604, 606, 608) in combination or alone. A carriage, if used,
can connect the modules with a rod extending axially between each
module. The carriage can include a drive apparatus. A traversal
apparatus can be used to allow a module or a carriage, if present,
to traverse the profiled helical surface. A traversal apparatus can
include a drive apparatus or at least one tracking mechanism
retained or resiliently held against the profiled helical surface.
The tracking mechanism can include a drive apparatus.
[0073] A traversal apparatus can include a rod extending axially
though the bore of the stator 650 and a drive apparatus configured
to traverse the rod. Similarly, the rod can be displaced through
the bore by means external to the stator 650. A track and guide, as
disclosed in reference to FIG. 5, can be utilized with the stator
650 redressing embodiment, with the track contained within the bore
of the stator 650.
[0074] Although one of each type of module is illustrated in the
FIGS. 5-6, a plurality of any or all of the modules can be present
without departing from the spirit of the invention. The elastomeric
deposition module employing a template and means for extrusion can
be used alone, and the other three modules are optional. Relative
movement between modules and the profiled helical surface can
consist of displacing the module, the profiled helical surface, a
carriage, if present, or any combination thereof. Automation means
can be utilized without departing from the spirit of the
invention.
[0075] FIG. 7 illustrates another means for providing relative
movement between a carriage 300 and a profiled helical surface, for
example, the rotor 750 shown. In use as a traversal apparatus, at
least one guide 702 is connected to the carriage 300, which
includes a plurality of tracking members (302, 302'). As the rotor
750 is rotated, by any means known in the art, the guide 702
restricts any rotation of the carriage 300 around the longitudinal
axis of the rotor 750 by contact with the track 704. The helix
shape coupled with the tracking members (302, 302') creates a screw
drive to dispose the carriage with respect to the longitudinal axis
of the rotor 650. Although illustrated using a carriage 300, the
guide and track system can be utilized by attaching the guide 702
to a template (100, 200) instead of the carriage 300. A template
(100, 200) may be disposed along the rotor 750 by connection to the
carriage 300. More than one track 704 and/or guide 702 can be used
as desired, for example, one similar to a railroad. Further, a
track 704 and guide 702 system can be used within a stator bore by
disposing a track 704 along the longitudinal axis of the bore. In
such configuration, a stator bore template (see 200 in FIG. 2) can
include an opening through the center to allow for passage of the
track 704. The stator bore template can further include a guide
702. A guide 702 may include wheels or be any type of track 704 and
guide 702 as is known in the art. The helical shape of the profiled
surface and the tracking mechanism allow for the traversal of the
profiled helical surface using only axial rotation of said
surface.
[0076] Referring now to FIG. 8, a carriage 300 with a template 100
mounted thereto is illustrated. The template 100 is supportably
connected to a mounting ring 802 that is rigidly connected to the
carriage 300. Although the template 100 is shown disposed on a
proximate end of the carriage 300, a template 100 can be disposed
between the two circular body members (304, 304') without departing
from the spirit of the invention. The template is movably retained
to the mounting ring 802 by four displacement servos 804. Although
four displacement servos are illustrated, a single or any plurality
of servos 804 can be used to adjust the template 100 relative to
the profiled helical surface, as is well known by one of ordinary
skill in the art. A servo 804 can be mounted in any orientation, so
as to provide the desired movement of the template. For example, a
servo can allow the template 100 to pitch, roll, yaw, or even
rotate, with respect to the mounting ring 802. A displacement servo
804 can allow correction of template 100 positioning errors. This
allows a user to maintain a desired gap, and thus a desired
thickness of elastomeric coating, between the profiled helical
surface of the template and the profiled helical surface to which
the elastomer is being deposited, for example, a rotor or stator
body.
[0077] Numerous embodiments and alternatives thereof have been
disclosed. While the above disclosure includes the best mode belief
in carrying out the invention as contemplated by the named
inventors, not all possible alternatives have been disclosed. For
that reason, the scope and limitation of the present invention is
not to be restricted to the above disclosure, but is instead to be
defined and construed by the appended claims.
* * * * *