U.S. patent application number 14/655779 was filed with the patent office on 2015-11-26 for arrangement and process for mounting a resonant spring in a linear motor compressor and a linear motor compressor.
The applicant listed for this patent is WHIRLPOOL S.A.. Invention is credited to Clodovir Gallo, Marcelo Knies, Dietmar Erich Bernhard Lilie, Henrique Bruggmann Muhle, Rinaldo Puff.
Application Number | 20150337822 14/655779 |
Document ID | / |
Family ID | 50002376 |
Filed Date | 2015-11-26 |
United States Patent
Application |
20150337822 |
Kind Code |
A1 |
Lilie; Dietmar Erich Bernhard ;
et al. |
November 26, 2015 |
ARRANGEMENT AND PROCESS FOR MOUNTING A RESONANT SPRING IN A LINEAR
MOTOR COMPRESSOR AND A LINEAR MOTOR COMPRESSOR
Abstract
A compressor comprising: a cylinder crankcase (10) defining a
compression chamber (13) housing a reciprocating piston (22); an
actuating means (40) coupled to the piston (22); and a resonant
spring means (50) having a first and a second diametrical end
segment (50a, 50b) respectively affixed to the actuating means (40)
by a first securing means (MF1) and to the cylinder crankcase (10)
by a second securing means (MF2), the latter comprising: a base
vise jaw (60, 60') affixed to the second diametrical end segment
(50b); a top vise jaw (70, 70') mounted between opposite portions
of the cylinder crankcase (10) and seated, pressed and locked
against the base vise jaw (60, 60'), in a condition in which the
axes of the end diametrical segments (50a, 50b) intercept the axis
of the compression chamber (13) and in which the piston (22) has a
predetermined axial position in the compression chamber (13).
Inventors: |
Lilie; Dietmar Erich Bernhard;
(Joinville - Sc, BR) ; Knies; Marcelo;
(Joinville-Sc, BR) ; Gallo; Clodovir;
(Joinville-Sc, BR) ; Puff; Rinaldo; (Joinville -
Sc, BR) ; Muhle; Henrique Bruggmann; (Joinville-Sc,
BR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
WHIRLPOOL S.A. |
Sao Paulo, SP |
|
BR |
|
|
Family ID: |
50002376 |
Appl. No.: |
14/655779 |
Filed: |
December 20, 2013 |
PCT Filed: |
December 20, 2013 |
PCT NO: |
PCT/BR2013/000592 |
371 Date: |
June 26, 2015 |
Current U.S.
Class: |
417/417 ;
92/132 |
Current CPC
Class: |
F04B 39/127 20130101;
F04B 39/0027 20130101; F04B 39/121 20130101; F04B 35/045 20130101;
F04B 35/04 20130101; F04B 39/123 20130101 |
International
Class: |
F04B 35/04 20060101
F04B035/04; F04B 39/00 20060101 F04B039/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 28, 2012 |
BR |
BR1020120336197 |
Claims
1. An arrangement for mounting a resonant spring in a linear motor
compressor of the type comprising: a cylinder crankcase defining a
cylindrical region inside which is formed a compression chamber a
piston reciprocating in the compression chamber, an actuating means
coupled to the piston; and a resonant spring means having a first
diametrical end segment, affixed to the actuating means by a first
securing means and a second diametrical end segment, affixed to the
cylinder crankcase by a second securing means, characterized in
that the second securing means comprises: a base vise jaw rigidly
affixed to the second diametrical end segment of the resonant
spring means in a predetermined position; a top vise jaw mounted,
by a first tightening means, between two opposite portions of the
cylinder crankcase and seated and compressed, by at least one
second tightening means and in an axially and radially adjustable
manner, in relation to the shaft of the resonant spring means,
against the base vise jaw, locking the latter to the top vise jaw,
in a condition in which the axes of the end diametrical segments of
the resonant spring means intercept the axis of the cylindrical
region of the cylinder crankcase and in which the piston presents a
predetermined axial position inside said cylindrical region.
2. The arrangement, as set forth in claim 1, characterized in that
the base vise jaw presents two guide surfaces located in planes
parallel to each other and orthogonal to the axis of the second
diametrical segment and symmetric in relation to the longitudinal
axis of the resonant spring means, the top vise jaw comprising a
"U" shaped body mounted, by the first tightening means, between the
two opposite extensions of the cylinder crankcase and presenting a
basic portion from which projects a pair of flanges parallel to
each other, located orthogonally to the axis of the second
diametrical segment and seated and compressed, by at least one of
the second tightening means, each against a respective guide
surface of the base vise jaw locking said vise jaws between each
other.
3. The arrangement, as set forth in claim 2, characterized in that
the base vise jaw is provided with at least one through opening
joining the two guide surfaces and having its longitudinal axis
intercepting the axis of the resonant spring means, said each
flange of the top vise jaw being provided with at least one through
hole, said second tightening means being defined by a bolt, loosely
arranged through a respective through opening of the base vise jaw
and, in a tight manner, through a respective through hole of the
top vise jaw and having an enlarged end head externally seated
against one of said flanges and an opposite end threaded inside a
locking means associated with the other of said flanges.
4. The arrangement, as set forth in claim 3, characterized in that
the locking means is defined by a nut externally seated against the
other of said flanges of the top vise jaw.
5. The arrangement, as set forth in claim 3, characterized in that
the locking means is defined by through hole itself, internally
threaded, of said other flange of the top vise jaw.
6. The arrangement, as set forth in claim 3, characterized in that
the cylinder crankcase incorporates two opposite extensions in the
form of two rods projecting axially from the cylindrical region in
the same direction, each rod being provided with a through hole
aligned with the through hole of the other rod, the first
tightening means being defined by a bolt, loosely arranged through
the top vise jaw, between the two flanges and between the second
tightening means and the basic portion of the top vise jaw and
through the through holes of the two opposite extensions of the
cylinder crankcase, said bolt having an enlarged end head
externally seated against one of said opposite extensions and an
opposite end threaded inside a locking means associated with the
other of said rods.
7. The arrangement, as set forth in claim 6, characterized in that
the locking means is defined by a nut operatively associated with
the other of said rods of the cylinder crankcase.
8. The arrangement, as set forth in claim 7, characterized in that
the nut is externally seated against said other rod of the cylinder
crankcase.
9. The arrangement, as set forth in claim 7, characterized in that
the nut is defined by an insert incorporated in said other rod of
the cylinder crankcase.
10. The arrangement, as set forth in claim 6, characterized in that
the locking means is defined by the through hole itself, which is
internally threaded, of said other rod of the cylinder
crankcase.
11. The arrangement, as set forth in claim 1, characterized in that
the resonant spring means is defined by at least one coil spring
and has the second diametrical end segment in two pieces and
defined in two radial portions, each of which being formed by a
respective spring wire end portion.
12. The arrangement, as set forth in claim 1, characterized in that
the base vise jaw presents a rear surface seated against the second
diametrical segment of the resonant spring means and comprises a
bracket having an arcuate median portion seated against said second
diametrical segment, and a pair of lateral tabs seated and rigidly
and permanently affixed to said rear surface of the base vise jaw,
pressing and locking said second diametrical segment to the base
vise jaw.
13. The arrangement, as set forth in claim 1, characterized in that
the cylindrical region of the cylinder crankcase houses, therein, a
sleeve, said compression chamber being defined inside said
sleeve.
14. The arrangement, as set forth in claim 2, characterized in that
the base vise jaw presents a frontal surface facing the basic
portion of the top vise jaw, said through opening being defined by
a lowered portion open to said frontal surface of the base vise
jaw.
15. The arrangement, as set forth in claim 2, characterized in that
the base vise jaw is provided with two through passages, joining
the two guide surfaces, and being located parallel and on opposite
sides in relation to a plane containing the axis of the resonant
spring means and the second diametrical end segment thereof.
16. The arrangement, as set forth in claim 15, characterized in
that each flange of the base vise jaw further presents a median cut
defining a gap large enough to loosely receive the second
diametrical end segment of the resonant spring means.
17. A process for mounting a resonant spring in a linear motor
compressor of the type defined in claim 1, characterized in that it
comprises the steps of: affixing, rigidly and definitively, the
base vise jaw to the second diametrical end segment of the resonant
spring means, in a predetermined and aligned position in relation
to the axis of the resonant spring means; affixing the diametrical
end segment of the resonant spring means to the actuating means by
means of the first securing means, with the axis of the actuating
means being arranged coaxially aligned to the axis of the resonant
spring means and to the axis of the base vise jaw; preliminary
affixing the top vise jaw to the base vise jaw using the second
tightening means; inserting the pre-mounted assembly defined by
actuating means, the resonant spring means and the piston inside
the cylinder crankcase, said piston being positioned inside the
compression chamber; adjusting the distance between the top of the
piston and the seating plane of the valve plate in the cylinder
crankcase; centralizing the magnets in relation to the cylinder
crankcase, according to two longitudinal planes, orthogonal to each
other and which contain the axis of the cylinder crankcase, and
maintaining the resonant assembly in the aligned position;
actuating the first tightening means in order to lock the top vise
jaw to the opposite extensions of the cylinder crankcase; and
actuating the second tightening means in order to lock the base
vise jaw to the top vise jaw.
18. (canceled)
Description
FIELD OF THE INVENTION
[0001] The present invention refers to an arrangement for mounting
a resonant spring in a compressor of the type driven by a linear
motor and, more particularly, to an arrangement for mounting a
resonant spring of the type which couples a movable assembly of
compression, that is, a piston/rod/actuating means assembly to a
non-resonant assembly, usually defined by a cylinder crankcase
fixed inside a compressor housing. The invention further refers to
a process for carrying out said mounting, and to a linear motor
compressor obtained with the proposed mounting arrangement.
PRIOR ART
[0002] In a linear compressor, the gas compression process
includes, mainly, two sub-assemblies: a first sub-assembly composed
by the cylinder, usually defined in a crankcase, and by the linear
motor assembly, which is also fixed to the crankcase, and which is
responsible for generating the thrust required for displacing the
piston inside the cylinder and, consequently, for the gas
compression; and a second sub-assembly formed by the piston, the
rod or connecting rod, the displacement means, which contains the
magnets driven by the motor, and by the resonant spring, which has
one of the ends thereof connected to the displacement means and the
other end connected to the crankcase.
[0003] For the proper operation of the compressor, in first place,
it is mandatory that a certain distance be held between the
cylinder top and the piston top, when the latter is in its
compression dead center, such distance defining the capacity of the
compressor and the variability of such capacity. Additionally, it
is also fundamental to ensure the alignment of the piston in
relation to the cylinder and thus minimize the piston load on the
cylinder, which functions as a pneumatic or oil bearing.
[0004] It should be understood that in order to obtain a correct
spacing between the piston top and the cylinder top, during the
mounting process, a chain of tolerances have to be respected, with
values being kept within narrow bands, in order that such distance,
upon ending the mounting, is kept within acceptable values.
Further, in order to obtain a correct alignment of the piston in
relation to the cylinder, the tolerances orthogonal to the main
shaft of the compressor also have to be kept with values within
narrow bands. This implies high costs for manufacturing the
necessary components, demanding complex and costly operations.
[0005] A known mounting arrangement, described in the Brazilian
patent application PI0705541-2 (WO2009/076734), comprises a first
securing means to secure one end of the resonant spring to the
actuating means by means of a plastic welding between two plastic
components respectively injected, over one end of the spring and
over one end of the actuating means. In this solution, said plastic
welding of the first securing means has the function of joining and
for compensating for axial, lateral and torsional tolerances. The
mounting arrangement of this prior solution does not require very
precise tolerances of the components to be mounted to each other,
both in the direction of the cylinder axis and in the orthogonal
direction, without compromising the concentric positioning of the
movable assembly in relation to the cylinder axis, as well as in
relation to the distance between a piston top portion in relation
to the cylinder top, which distance, as already mentioned, defines
the displaced volume and the corresponding refrigeration capacity
of the compressor.
[0006] Although it is a very interesting solution process-wise, two
drawbacks are introduced in the product.
[0007] One drawback is due to the fact that the fixation by means
of plastic material is very dependent on the type and quality of
the plastic being used. Furthermore, the plastic material may
undergo thermo-chemical deterioration as time goes by, thereby
reducing the reliability of the fixation obtained.
[0008] Another drawback is due to the fact that the plastic
component defining the first securing means, joining the actuating
means to the resonant spring, operates as a second spring which,
depending on its rigidity, may amplify the excitement caused by the
compression of the gas on the piston top and thus excite resonant
modes of the spring.
[0009] Another known mounting arrangement described in the
Brazilian patent application PI1000181-6 (WO2011/082461) comprises
fixation and alignment means of the resonant assembly in relation
to the crankcase and linear motor, not requiring too tight
tolerances of the components, both in the direction of the main
axis and in the orthogonal direction and allowing, even with wider
tolerances, to achieve a correct positioning of the piston, with a
suitable alignment between the piston and the cylinder.
[0010] In said second prior art solution, the alignment adjustments
in three directions may be carried out using reliable mechanical
fixation means, which do not amplify the excitement generated by
the gas compression on the piston top.
[0011] In this second known solution, the first securing means
comprises a clamp already incorporated to the actuating means and
which is fitted around a diametrical end segment of the spring wire
and pressed against the latter by means of a tightening bolt. This
known union between the actuating means and the spring adjacent end
allows obtaining alignment adjustments in two directions, which are
the rotation of the actuating means around the diametrical end
segment of the spring wire and the linear displacement of the
actuating means along said diametrical segment of the spring. This
spring-actuating means union allows for the centralization of the
latter in relation to the longitudinal axis of the spring as an
initial step in the mounting process of the resonant assembly.
[0012] However, in said prior art second solution, the opposite end
of the spring comprises one two-piece diametrical segment, defined
in two radial portions, each of which being formed by a respective
end portion of the spring wire, said two-piece diametrical segment
receiving a second securing means defined by an inner vise jaw and
an outer vise jaw, the first carrying a half-shell facing the other
vise jaw, in order that both vise jaws may be pressed against each
other, by means of tightening bolts, around the two-piece
diametrical segment of the spring, the outer vise jaw being
provided with means for bearing it in the non-resonant assembly,
particularly in the cylinder crankcase.
[0013] The half-shell is mounted to the inner vise jaw in order to
be linearly displaceable in a diametrical direction in relation to
the spring and orthogonal to the two-piece diametrical segment of
the spring wire, ensuring the possibility of adjustment according
to this direction. Furthermore, the spring may be displaced in
relation to the half shell in a direction orthogonal to the first
direction, that is, in the direction matching that of the two-piece
diametrical segment, ensuring the assembly adjustment in a second
direction. This mounting arrangement further allows for a third
adjustment direction defined by the possibility of rotating the
second securing means, defined by the assembly of vise jaws and
half shell, around the two-piece diametrical segment of the spring
wire.
[0014] During the mounting alignment process, the adjustments in
the three directions are carried out until the alignment is
properly set. When this happens, both vise jaws are then locked to
each other and around the two-piece diametrical segment of the
spring wire, by tightening two bolts.
[0015] Although being more advantageous in relation to the first
mounting system using plastic elements, this second known solution
requires that during the alignment process of the compression
mechanism defining the resonant assembly, the tightening bolts of
the inner and outer vise jaw of the second securing means, must to
be relieved, allowing the vise jaw to move in relation to the end
radial portions of the spring wire. However, the spring presents
shape malformations, especially alignment deviations between the
end radial portions of the wire in the two-piece diametrical
segment. When the load between the two vise jaws is released for
carrying out the alignment adjustment, the spring tends to
naturally deform, causing the alignment process to be undesirably
long. Furthermore, precise equipment are required for measuring the
piston positioning in relation to the crankcase, as well as with
the magnets in relation to the motor center, since the assembly
should not be mechanically forced, for in such case,, upon being
released, the mechanism would lose alignment due to the tensions
present on the spring.
[0016] From the disclosure above, it is thus desirable the
development of a new solution for the complete alignment of the
parts comprised by the resonant assembly, without the drawbacks of
the prior solutions mentioned above.
SUMMARY OF THE INVENTION
[0017] The present invention has the generic object of providing an
arrangement for mounting a resonant spring in a linear compressor,
of the type considered above and which allows the use of component
parts of relatively simple and easy construction and assembly,
without requiring too tight tolerances for obtaining a correct
centralized positioning of the piston inside the cylinder and a
resistant and reliable mounting, throughout the entire life span of
the compressor, without interfering in the operational
characteristics of the resonant spring.
[0018] The present invention has the further object of providing a
mounting arrangement, such as mentioned above and which is able to
guarantee, upon the assembly of the piston to the cylinder, a
predetermined distance between the piston top and the valve plate,
to ensure an adequate capacity to the compressor.
[0019] Another object of the present invention is to guarantee a
correct positioning of the magnets in relation to the motor, with
an adequate concentricity in both directions orthogonal to the
piston displacement axis and angularly around said axis, allowing
the magnets to travel the space between the motor blades without
contacting the latter.
[0020] In order to comply with the objects cited above, the present
invention provides an arrangement for mounting a resonant spring in
a linear motor compressor of the type comprising: a cylinder
crankcase defining a cylindrical region inside which is formed a
compression chamber; a piston which reciprocates in the compression
chamber, an actuating means coupled to the piston; and a resonant
spring means having a first diametrical end segment affixed to the
actuating means by a first securing means and a second diametrical
end segment fixed to the cylinder crankcase by a second securing
means.
[0021] According to the invention, the second securing means
comprises: a base vise jaw rigidly affixed to the second
diametrical segment of the resonant spring means in a predetermined
position; a top vise jaw mounted, by a first tightening means,
between two opposite portions of the cylinder crankcase and seated
and compressed, by at least one second tightening means and in a
axially and radially adjustable manner in relation to the shaft of
the resonant spring means, against the base vise jaw, locking the
latter to the top vise jaw, in a condition in which the axes of the
end diametrical segments of the resonant spring means intercept the
axis of the cylindrical region of the cylinder crankcase and in
which the piston presents a predetermined axial position inside
said cylindrical region.
[0022] Considering the previous fixation of the resonant spring
means to the movable assembly of compression, in a condition in
which the axis of both parts are kept coaxial to each other, the
present construction for the mounting arrangement, particularly for
the second securing means, allows carrying out the required axial
alignment and positioning of the resonant assembly in relation to
the cylinder crankcase of the compressor and to the motor, during
the assembly of the latter, without risking to lose the alignment
between the two radial portions of the second diametrical end
segment of the resonant spring means.
[0023] The invention also uses the known simplified construction
for the first securing means, which is able to allow the first
diametrical end segment of the resonant spring means to be fixed to
the movable assembly of compression, in a position defined along
the relative displacement thereof in the diametrical direction of
said first diametrical end segment of the resonant spring means and
around said direction, facilitating the coaxial alignment of the
resonant spring means with the movable assembly of compression.
[0024] The invention also refers to a process for mounting the
resonant spring means in a linear motor compressor of the type
defined above, and to the linear motor compressor obtained.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The invention will be described below, with reference to the
enclosed drawings, given by way of example of embodiments of the
invention and in which:
[0026] FIG. 1 represents a schematic and simplified longitudinal
sectional view of a compressor driven by a linear motor and having
the resonant spring means mounted to the parts of compressor
assembly and of non-resonant assembly, according to an arrangement
of the prior art;
[0027] FIG. 2 represents a perspective view of the resonant spring
means, having the first diametrical end segment thereof mounted to
the first securing means which is carried by the movable assembly
of compression, and the second diametrical end segment thereof
affixing the base vise jaw of the second securing means, according
to a first configuration of the invention;
[0028] FIG. 3 represents a perspective view similar to that of FIG.
2, however illustrating the piston already provided with its
cylindrical skirt;
[0029] FIGS. 4A and 4B represent a longitudinal diametrical
sectional view of the resonant spring means, offset by 90.degree.
and illustrating the base vise jaw according to the first
configuration of the invention and rigidly affixed to the second
diametrical segment of the spring means;
[0030] FIG. 5 represents a perspective view of the spring means
having the first diametrical end segment thereof affixed to the
movable assembly of compression, only partially illustrated, and
the second diametrical end segment thereof affixing the base vise
jaw, with the top vise jaw being illustrated in an exploded
condition, said vise jaws being built according to the first
configuration of the invention;
[0031] FIG. 6 represents a schematic and simplified longitudinal
sectional view of a compressor of the type shown in FIG. 1, without
the housing, however including the mounting arrangement of the
present invention according to the first configuration;
[0032] FIG. 7 represents a view similar to that of FIG. 6, however
with the longitudinal section plane offset by 90 degrees in
relation to that of FIG. 6;
[0033] FIG. 8 represents a perspective view of the movable assembly
of compression and resonant spring means, mounted to the cylinder
crankcase, using the first configuration of the base and top vise
jaws;
[0034] FIG. 9 represents a perspective view of the spring means
having the first diametrical end segment thereof affixed to the
movable assembly of compression, only partially illustrated, and
the second diametrical end segment thereof affixing the base vise
jaw, with the top vise jaw being illustrated in an exploded
condition, said vise jaws being built according to a second
configuration of the invention;
[0035] FIG. 10 represents a perspective view of the movable
assembly of compression and resonant spring means, with the base
and top vise jaws of the second configuration and with the
tightening means in a mounted position; and
[0036] FIG. 11 represents a perspective view of the movable
assembly of compression and resonant spring means, mounted to each
other and to the cylinder crankcase, with the tightening means in
an exploded position and using the second configuration of the base
and top vise jaws.
DETAILED DESCRIPTION OF THE INVENTION
[0037] As already mentioned, the mounting arrangement of resonant
spring of the present invention is described for a refrigeration
compressor construction driven by a linear motor.
[0038] As exemplarily shown in FIG. 1 of the attached drawings, the
compressors, usually used for refrigeration and driven by an
electric motor of the linear type, comprise a housing 1, usually
hermetic and which houses a non-resonant assembly, including a
cylinder crankcase 10 which may be mounted in housing 1 by means of
suspension springs 11, for example, coil springs.
[0039] The cylinder crankcase 10 incorporates a cylindrical region
12 inside which is housed a sleeve 20 defining a compression
chamber 13, having one end 13a usually closed by a valve plate 14
and by a head 15, and an open opposite end 13b through which is
mounted a piston 22, incorporating a cylindrical skirt 22a and
which reciprocates inside the compression chamber 13 of the sleeve
20. The piston 22 is coupled, usually by means of a rod 30, to an
actuating means 40 which carries magnets 41 of a linear motor M
which is mounted to the cylinder crankcase 10.
[0040] The cylinder crankcase 10 may further incorporate two
opposite extensions 17, which take the form of two rods 17a which
project axially from the cylindrical region 12, in the same
direction, in order to retain, therebetween, the linear motor M.
Each rod 17a is provided with a through hole 17b aligned with the
through hole 17b of the other rod 17a.
[0041] The linear motor M is responsible for providing the
necessary thrust for the displacement of the piston 22 inside the
compression chamber 13 of the sleeve 20 and consequently, for the
compression of refrigerant fluid in gas form.
[0042] The movable assembly of compression, defined by the
piston-rod-actuating means assembly, is coupled to a resonant
spring means 50, mounted in order to apply opposite axial forces on
the piston 22, upon the reciprocating axial displacement of the
latter inside the compression chamber 13. The resonant spring means
acts on the movable assembly of compression, together with the
linear motor M of the compressor, also operating as an axial
displacement guide of the piston 22. The movable assembly of
compression and the resonant spring means define the resonant
assembly of the compressor.
[0043] In the prior art construction, illustrated by way of example
in FIG. 1, the resonant spring means 50 is defined by a single coil
spring, having a first diametrical end segment 50a and a second
diametrical end segment 50b, usually two-piece, said end
diametrical segments 50a, 50b being respectively affixed to the
movable assembly of compression (usually to the actuating means
40), by a first securing means MF1 and to the non-resonant
assembly, for example to the cylinder crankcase 10 or to the
supporting structure thereof, by a second securing means MF2.
[0044] Although not illustrated in the attached drawings, it should
be understood that the resonant spring means 50 may be formed by
two coil springs, situation in which each of the end diametrical
segments 50a, 50b, of the resonant spring means 50 is defined by
end radial extensions, substantially facing each other and coaxial
to each other, of each of the two coil springs. The end radial
extensions may also be positioned so as to overlap and to be
substantially parallel to each other, according to another
constructive embodiment.
[0045] Thus, the resonant spring means 50 may be defined by at
least one coil spring, having the first diametrical end segment 50a
defined by a continuous spring wire extension and the second
two-piece diametrical end segment 50b and defined in two radial
portions, each of which being formed by a respective spring wire
end portion.
[0046] The end diametrical segments 50a, 50b, of the resonant
spring means 50, in the form of a coil, are coaxial to each other
and located according to a direction which is orthogonal to the
axis of the resonant spring means 50, not being mandatorily
parallel to each other. This type of construction is described and
illustrated in said patent application PI1000181-6 (WO2011/082461).
The refrigeration compressor to which is applied the resonant
spring mounting arrangement of the present invention comprises,
inside a housing 1, usually hermetic, the same basic components
described for the linear motor compressor illustrated in FIG. 1,
with said common components being defined by the same reference
numerals.
[0047] The first securing means MF1 may comprise, such as already
described in said patent application PI1000181-6, two bearing
portions 6, opposite to each other and each provided with a recess
7 configured to act as a concave cradle, usually with a
semi-circular profile, inside which is partially housed a
respective extension of the first diametrical end segment 50a of
the resonant spring means 50, which segment is defined by an
usually, but not mandatorily, continuous extension of the wired
which forms the resonant spring means 50.
[0048] In the illustrated construction, the two bearing portions 6
are incorporated to the actuating means 40 and are configured to
brace and fix, to each other, the first diametrical end segment 50a
of the resonant spring means 50.
[0049] The construction of the first securing means MF1 allows the
first diametrical end segment 50a of the resonant spring means 50
to be linearly displaced through the interior of the two bearing
portions 6, before the final tightening of the latter, according to
the diametrical direction of the axis of said first diametrical end
segment 50a, and also angularly around said diametrical axis. The
positioning of said first diametrical end segment 50a of the
resonant spring means 50 may be thus linearly and angularly
adjusted during the assembly of the movable assembly, before the
final pressing of a tightening means, allowing to easily obtain the
desired coaxial fixation of the resonant spring means 50 to the
actuator 40, that is, to the movable assembly of compression. It
should be understood that the resonant spring means 50 is built to
have the end diametrical segments 50a e 50b thereof positioned in a
centralized manner in relation to the axis of the resonant spring
means 50, but not necessarily parallel to each other.
[0050] In illustrated embodiment, the end diametrical segments 50a,
50b of the resonant spring means 50 are located coplanar to each
other and according to directions orthogonal to the axis of the
resonant spring means 50.
[0051] In this case, the bearing portions 6 have the axis of their
recesses 7 also located orthogonal to the axis of the resonant
spring means 50, allowing for the linear adjustment of the
positioning of the first diametrical end segment 50a of the spring
means to be carried out according to a direction orthogonal to the
axis of the resonant spring means 50, and the angular adjustment of
said first diametrical end segment 50a to be carried out by the
angular displacement of the resonant spring means 50 around the
axis of said first diametrical end segment 50a.
[0052] According to FIGS. 2 to 8 of the present invention, the
second securing means MF2 comprises a base vise jaw rigidly affixed
to the second diametrical end segment 50b, usually in two pieces,
of the resonant spring means 50 in a predetermined position.
[0053] The second diametrical end segment 50b of the resonant
spring means 50 is defined in two radial portions, each being
formed by a respective end portion of the spring wire.
[0054] According to the same FIGS. 2 to 8, the second securing
means MF2 also comprises a top vise jaw 70 mounted, by means of a
first tightening means 80, between the two opposite extensions 17
of the cylinder crankcase 10. The second securing means MF2 is
further seated and compressed, by a second tightening means 90 and
in a axially and radially adjustable manner, in relation to the
shaft of the resonant spring means 50, against the base vise jaw
60, locking the latter to the top vise jaw 70, in a condition in
which the axis of the end diametrical segments 50a, 50b of the
resonant spring means 50 intercept the axis of the cylindrical
region 12 and in which the piston 22 presents a predetermined axial
position inside the sleeve 20.
[0055] The base vise jaw 60 may present two guide surfaces 61,
located in planes parallel to each other and orthogonal to the axis
of the second diametrical end segment 50b and symmetrical in
relation and symmetrical in relation to the longitudinal axis of
the resonant spring means 50.
[0056] In the construction illustrated in FIGS. 2 to 8, which
represents a first embodiment of the invention, the top vise jaw 70
comprises a "U" shaped body 71 mounted, by means of the first
tightening means 80, between the two opposite extensions 17 of the
cylinder crankcase 10 and presenting a basic portion 71a from which
projects a pair of flanges 72 parallel to each other, located
orthogonally to the axis of the second diametrical end segment 50b
and seated and compressed, by the second tightening means 90, each
against a respective guide surface 61 of the base vise jaw 60,
locking said vise jaw to each other.
[0057] In the first embodiment of the present invention,
illustrated in FIGS. 2 to 8, the base vise jaw 60 is provided with
a through opening 62 joining the two guide surfaces 61 and having
the longitudinal axis thereof intercepting the axis X of the
resonant spring means 50, with each flange 72 of the top vise jaw
70 being provided with a through hole 73.
[0058] The second tightening means 90 is defined by a bolt 91,
loosely disposed through the through opening 62 of the base vise
jaw 60 and tightly through a respective through hole 73 of the top
vise jaw 70. The bolt 91 presents an enlarged end head 91a
externally seated against one of said flanges 72 and an opposite
end 91b threaded inside a locking means MT1 associated to the other
of said flanges 72.
[0059] According to said first configuration, the locking means MT1
is defined by an opposite end nut 91c, externally seated against
the other of said flanges 72 of the top vise jaw 70. Although not
illustrated herein in detail, it should be understood that the
locking means MT1 may be defined by the through hole 73 itself,
internally threaded, of said other flange 72 of the top vise jaw
70.
[0060] The base vise jaw 60 presents a frontal surface 60a facing
the basic portion 71a of the body 71 of the top vise jaw 70, the
through opening 62 being defined by a lowered portion 62a open to
said front surface 60a of the base vise jaw 60.
[0061] The first tightening means 80 is defined by a bolt 81,
loosely provided through the top vise jaw 70, between the two
flanges 72, and between the second tightening means 90 and the
basic portion 71a of the top vise jaw 70 and through a through hole
17b provided in rod 17a of each of the two opposite extensions 17
of the cylinder crankcase 10. The bolt 81 has an enlarged end head
81a externally seated against one of said rods 17a and an opposite
end 81b threaded inside a locking means MT2 associated with the
other of said rods 17a.
[0062] In the first illustrated configuration (FIGS. 2 to 8), the
locking means MT2 is defined by a nut 81c operatively associated
with the other of said rods 17a of the cylinder crankcase 10.
[0063] Although not illustrated in details in FIGS. 2 to 8, it
should be understood that the nut 81c may be externally seated
against the other rod 17a of the cylinder crankcase 10, or also be
defined by an insert incorporated in said other rod 17a of the
cylinder crankcase 10, for example, by over-injecting the
latter.
[0064] The locking means MT2 may be defined by the through hole 17b
itself, internally threaded, of said other rod 17a of the cylinder
crankcase 10.
[0065] The base vise jaw 60 of the first configuration may present
a rear surface 64, seated against the second diametrical end
segment 50b of the resonant spring means 50 and comprises a bracket
65 having an arcuate median portion 65a and which is seated against
said second diametrical end segment 50b, and a pair of lateral tabs
65b, which are seated and rigidly and permanently fixed to said
rear surface 64 of the base vise jaw 60, for example, by welding,
pressing and locking said second diametrical end segment 50b
(two-piece in the illustrated construction) of the resonant spring
means 50, to the base vise jaw 60.
[0066] According to the construction illustrated in FIGS. 2 to 8,
the formation of the compressor starts by mounting the base vise
jaw 60 and of the bracket 65 in the second two-piece diametrical
end segment 50b of the resonant spring means 50, locking the two
end radial portions of the spring wire. From this mounting, the
assembly defined by the base vise jaw 60 and bracket 65 will no
longer be dismounted, with the bracket 65 being mounted against the
rear surface 64 of the base vise jaw 60 by means of pressing
followed by fixation, usually by welding, of the lateral tabs 65b
against the base vise jaw 60.
[0067] In this mounting operation, it is obtained the alignment of
the base vise jaw 60 in relation to the axis X of the resonant
spring means 50, it being understood that said axis X should pass
through the center of the first diametrical end segment 50a on the
opposite side of the resonant spring means 50 and also through the
center of the median passage 62 of the base vise jaw 60. In this
phase of the mounting, it is also important that the guide surfaces
61 of the base vise jaw 60 be positioned in an orthogonal or
substantially orthogonal manner in relation to the axis of the
second diametrical end segment 50b of the resonant spring means
50.
[0068] In a second mounting phase, the first diametrical end
segment 50a of the resonant spring means 50 is mounted to the
actuating means 40 using the first securing means MF1, as
previously described, however having as reference the base vise jaw
60 already affixed to the second two-piece diametrical end segment
50b of the resonant spring means 50. This method allows the axis of
the actuating means 40 to be coaxially aligned with the axis X of
the resonant spring means 50 and, consequently, with the axis of
the base vise jaw 60. Next, the top vise jaw 70 is fixed to the
base vise jaw 60, using the second tightening means 90, which, when
operated, deforms both flanges 72 of the top vise jaw 70, locking
the base vise jaw 60 therein. In this phase, the driving of the
second tightening means 90 need not be effected definitively and
with the maximum required torque. The locking in this phase is
preliminary, with the definitive locking being executed only at the
end of the mounting process, as described further below.
[0069] It should be understood that the design of the flanges 72
and their spacing in relation to the base vise jaw 60 is carried
out in order to allow both the assembly and the secure locking of
the two vise jaws between each other.
[0070] The pre-mounted assembly defined by the actuating means 40,
the resonant spring means 50 and the piston 22 are inserted inside
the cylinder crankcase 10, with the piston 22 being positioned
inside the sleeve 20, which is previously mounted in the
cylindrical region 12 of the cylinder crankcase 10 and,
consequently, aligned in relation to the cylinder crankcase 10. In
this moment, the distance between the top of the piston 22 and the
seating plane of the valve plate in the sleeve 20 and in the
cylinder crankcase 10 are adjusted to the desired value.
[0071] Subsequently, the magnets 41 are centralized in relation to
the cylinder crankcase 10, according to both longitudinal planes,
orthogonal to each other and which comprise the axis of the
cylinder crankcase 10. This centralization may also be carried out
by using non-illustrated mounting devices, which are able to
centralize the resonant assembly and keep it in a position aligned
to the axis of the cylinder crankcase 10.
[0072] Once the resonant assembly is aligned and positioned in the
cylinder crankcase 10, it follows the actuation of the first
tightening means 80, located through the opposite extensions 17 of
the cylinder crankcase 10, providing the tightening of the rods 17a
of said opposite extensions 17 against the adjacent end faces of
the top vise jaw 70, locking the latter in relation to the cylinder
crankcase 10.
[0073] Next, it is carried out the actuation of the second
tightening means 90 to provide the compression of the guide
surfaces 61 of the base vise jaw 60, locking the latter in the top
vise jaw 70.
[0074] Since the entire mechanism represented by the resonant
assembly is aligned to the axis of the cylinder crankcase by means
of the mentioned mounting devices (not illustrated), after driving
the two tightening means 80, 90, the mounting devices may be
removed, and the resonant assembly being thus provided with the
desired alignment.
[0075] FIGS. 9 to 11 illustrate the invention using a second
configuration for the second securing means MF2, which also
comprises a base vise jaw 60' rigidly fixed to the second
diametrical end segment 50b, usually two-piece, of the resonant
spring means 50 in a predetermined position, exactly as already
described in relation to the mounting of the base vise jaw 60 of
the first embodiment. According to the same FIGS. 9 to 11, the
second securing means MF2 also comprises a top vise jaw 70' which
is likewise mounted, by means of a first tightening means 80',
between the two opposite extensions 17 of the cylinder crankcase
10. The second securing means MF2 is also seated and compressed, by
two second tightening means 90' and in an axially and radially
adjustable manner in relation to the axis of the resonant spring
means 50, against the base vise jaw 60', locking the latter to the
top vise jaw 70', in a condition such that the axes of the end
diametrical segments 50a, 50b of the resonant spring means 50
intercept the axis of the cylindrical region 12, and in which the
piston 22 presents a predetermined axial position inside the sleeve
20.
[0076] The base vise jaw 60' may present two guide surfaces 61',
defined in planes parallel to each other and orthogonal to the axis
of the second diametrical end segment 50b, and symmetrical in
relation to the longitudinal axis of the resonant spring means 50.
In the construction illustrated in FIGS. 9 to 11, the top vise jaw
70' comprises a body 71', "U" shaped and presenting a basic portion
71a' from which projects a pair of flanges 72', parallel to each
other, the top vise jaw 70' being mounted, by the first tightening
means 80', between the two opposite extensions 17 of the cylinder
crankcase 10.
[0077] The flanges 72' of the top vise jaw 70' are located
orthogonally to the axis of the second diametrical end segment 50b,
and seated and compressed, by the second tightening means 90', each
against a respective guide surface 61' of the base vise jaw 60',
locking said vise jaws to each other.
[0078] Each flange 72' of the base vise jaw 70' presents a pair of
through holes 73' coaxially aligned to a respective through hole
73' of the other flange 72', and further a median cut 74' defining
a gap sufficient to loosely receive the second diametrical end
segment 50b of the resonant spring means 50, each of the median
cuts 74' being further provided with an internal end widening 75'
inside which said second diametrical end segment 50b is even more
loosely positioned, upon the assembly of the compressor.
[0079] In the second configuration of the invention, the base vise
jaw 60' is provided with two through openings 62', joining the two
guide surfaces 61a' and disposed parallel and spaced from each
other and defined on opposite sides, usually symmetrically, in
relation to a plane containing the axis of the resonant spring
means and of the second diametrical end segment 50b thereof.
[0080] Each of the second tightening means 90' is defined by a bolt
91', loosely provided through the respective through passages 62'
of the base vise jaw 60'. The through passages 62' present a
diameter greater than that of the bolts 91' in order to allow
radial and axial assembly adjustments, as previously described in
relation to the first configuration of the invention. Each bolt 91'
is located, in a tight manner, through a respective pair of through
holes 73' of the top vise jaw 70'.
[0081] Each bolt 91' presents an enlarged end head 91a' externally
seated against one of said flanges 72' of the top vise jaw 70' and
one opposite end 91b' threaded inside a locking means MT1'
associated to the other of said flanges 72'.
[0082] According to said second configuration, the locking means
MT1 is defined by an opposite end nut 91c', externally seated
against the other of said flanges 72' of the top vise jaw 70'.
Although not being illustrated herein in detail, it should be
understood that the locking means MT1' may be defined by through
holes 73', internally threaded, of said other flange 72' of the top
vise jaw 70'.
[0083] In said second configuration, the first tightening means 80'
is defined by a bolt 81', loosely arranged through the top vise jaw
70', between the flanges 72' thereof and through the through hole
17b provided in rod 17a of each of the two opposite extensions 17
of the cylinder crankcase 10. The bolt 81' presents the same
construction and assembly already described in relation to the bolt
81 of the first configuration, and the same constructive variations
described in relation to FIGS. 2 to 8 are likewise applicable. The
base vise jaw 60' of the second configuration, illustrated in FIGS.
9 to 11, may be mounted to the second diametrical end segment 50b
of the resonant spring means 50 exactly in the same manner already
described in relation to the configuration illustrated in FIGS. 2
to 8, that is, by using the same bracket 65.
[0084] According to the construction illustrated in FIGS. 9 to 11,
the mounting of the compressor begins by mounting the base vise jaw
60' and the bracket 65 in the second two-piece diametrical end
segment 50b of the resonant spring means 50, locking the two end
radial portions of the spring wire. From this mounting, the
assembly defined by the base vise jaw 60' and bracket 65 will no
longer be disassembled, with the bracket 65 being mounted against a
rear surface 64' of the base vise jaw 60' by pressing followed by
fixation, usually by welding, of the lateral tabs 65b against the
base vise jaw 60'. The base vise jaw 60' presents the rear surface
64' thereof facing the basic portion 71a' of the body 71' of the
top vise jaw 70', upon mounting the two vise jaws. In this
embodiment, the first tightening means 80' is loosely arranged
between the flanges 74' and between the basic portion 71a' of the
top vise jaw 70' and the rear surface 64' of the base vise jaw
60'.
[0085] In this mounting operation, it is obtained the alignment of
the base vise jaw 60' in relation to the axis X of the resonant
spring means 50. It should be understood that said axis X should
pass by the center of the first diametrical end segment 50a on the
opposite side of the resonant spring means 50 and also between the
two through passages 62' of the base vise jaw 60'. In this mounting
phase, it is also important that the guide surfaces 61' of the base
vise jaw 60' be positioned orthogonally or substantially
orthogonally to the axis of the second diametrical end segment 50b
of the resonant spring means 50.
[0086] In a second mounting phase, the first diametrical end
segment 50a of the resonant spring means 50 is mounted to the
actuating means 40 using the first securing means MF1, as
previously described, however having as reference the base vise jaw
60' already previously fixed in the second two-piece diametrical
end segment 50b of the resonant spring means 50. This method allows
the axis of the actuating means 40 to be coaxially aligned to the
axis X of the resonant spring means 50 and therefore to the axis of
the base vise jaw 60'.
[0087] Next, the top vise jaw 70' is fixed to the base vise jaw 60'
using the second tightening means 90', which, when actuated, deform
the two lateral portions 72a' of the top vise jaw 70', locking the
base vise jaw 60' therein. In this phase, the actuation of the
second tightening means 90 is not necessarily carried out
definitively and with the maximum required torque. The locking in
this phase is preliminary, and the definitive locking is carried
out only at the end of the mounting process.
[0088] It should be understood that the dimensioning of the flanges
72' and the gap thereof in relation to the base vise jaw 60' is
carried out in order to allow both the mounting and the safe
locking of the two vise jaws to each other.
[0089] The pre-mounted assembly defined by the actuating means 40,
the resonant spring means 50 and the piston 22 is inserted inside
the cylinder crankcase 10, said piston being positioned inside the
sleeve 20, which is previously mounted in the cylindrical region 12
of the cylinder crankcase 10 and, consequently, aligned in relation
to the cylinder crankcase 10. In this moment, by means of
non-illustrated external devices, the distance between the top of
the piston 22 and the seating plane of the valve plate in the
sleeve 20 and in the cylinder crankcase 10 is adjusted to the
desired value.
[0090] Next, the magnets 41 are centralized in relation to the
cylinder crankcase 10, according to the two longitudinal planes,
orthogonal to each other and which contain the axis of the cylinder
crankcase 10. This centralization is also carried out by using
non-illustrated mounting devices, able to centralize the resonant
assembly and keep it in a position aligned to the axis of the
cylinder crankcase 10.
[0091] Following the resonant assembly alignment and positioning in
the cylinder crankcase 10, it is then carried out the actuation of
the first tightening means 80' and, subsequently, of the second
tightening means 90', exactly as previously described in relation
to the first configuration of FIGS. 2 to 8.
[0092] In short, the mounting process of the resonant spring, in a
linear motor compressor of the type defined above, comprises the
steps of: affixing, rigidly and definitively, the base vise jaw 60,
60' to the second diametrical end segment 50b of the resonant
spring means 50, in a predetermined and aligned position in
relation to the axis X of the resonant spring means 50; affixing
the diametrical end segment 50a of the resonant spring means 50 to
the actuating means 40 by means of the first securing means MF1,
with the axis of the actuating means 40 being arranged coaxially
aligned to the axis X of the resonant spring means 50 and to the
axis of the base vise jaw 60, 60'; preliminary affixing the top
vise jaw 70, 70' to the base vise jaw 60, 60' using at least one
second tightening means 90, 90'; inserting the pre-mounted assembly
defined by actuating means 40, the resonant spring means 50 and the
piston 22 inside the cylinder crankcase 10, with the piston 22
being positioned inside the sleeve 20; adjusting the distance
between the top of the piston 22 and the seating plane of the valve
plate 14 in the cylinder crankcase 10; centralizing the magnets in
relation to the cylinder crankcase 10, according to the two
longitudinal planes, orthogonal to each other and which contain the
axis of the cylinder crankcase 10, and maintaining the resonant
assembly in the aligned position; actuating the first tightening
means 80, 80' in order to lock the top vise jaw 70, 70' to the
opposite extensions 17 of the cylinder crankcase 10; and actuating
at least one second tightening means 90, 90' in order to lock the
base vise jaw 60, 60' to the top vise jaw 70, 70'.
* * * * *