U.S. patent application number 17/252246 was filed with the patent office on 2021-10-21 for pump device and method for at least locally sealing the pump device.
The applicant listed for this patent is ebm-papst St. Georgen GmbH & Co. KG. Invention is credited to Benjamin DIETZ, Hassan GHODSI-KHAMENEH, Daniel HAUER, Andreas KUHLMEY, Gerhard KUHNERT, Mario STAIGER.
Application Number | 20210324843 17/252246 |
Document ID | / |
Family ID | 1000005737020 |
Filed Date | 2021-10-21 |
United States Patent
Application |
20210324843 |
Kind Code |
A1 |
KUHLMEY; Andreas ; et
al. |
October 21, 2021 |
PUMP DEVICE AND METHOD FOR AT LEAST LOCALLY SEALING THE PUMP
DEVICE
Abstract
The invention relates to a pump device for pumping a fluid,
comprising a hydraulic housing (2), a pump ring support (5) which
is arranged in the hydraulic housing (2), an elastic pump ring (3)
which is arranged between the pump ring support (5) and the
hydraulic housing (2) in the radial direction (RR), and a
separating chamber pin (4), wherein the pump ring (3) can be
pressed in the radial direction (RR) against an inner wall surface
of the hydraulic housing (2) by means of the separating chamber pin
(4) in order to produce an at least local seal on the hydraulic
housing (2), and wherein the hydraulic housing (2) has a radial
offset section (6), along which an offset element that is formed on
the separating chamber pin (4) or a separate offset element that
interacts with the separating chamber pin can be introduced in the
axial direction (AR) and thus offsets the separating chamber pin
(4) and the pump ring (3) in the radial direction.
Inventors: |
KUHLMEY; Andreas;
(Schramberg, DE) ; KUHNERT; Gerhard;
(VS-Villingen, DE) ; GHODSI-KHAMENEH; Hassan; (St.
Georgen, DE) ; STAIGER; Mario;
(Schramberg-Tennenbronn, DE) ; HAUER; Daniel;
(Ortenberg, DE) ; DIETZ; Benjamin; (Furtwangen,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ebm-papst St. Georgen GmbH & Co. KG |
St. Georgen |
|
DE |
|
|
Family ID: |
1000005737020 |
Appl. No.: |
17/252246 |
Filed: |
May 16, 2019 |
PCT Filed: |
May 16, 2019 |
PCT NO: |
PCT/EP2019/062583 |
371 Date: |
December 14, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04B 43/02 20130101 |
International
Class: |
F04B 43/02 20060101
F04B043/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 15, 2018 |
DE |
10 2018 114 455.5 |
Claims
1. A pump device for pumping a fluid, comprising a hydraulic
housing (2), a pump ring support (5) which is arranged in the
hydraulic housing (2), an elastic pump ring (3) which is arranged
between the pump ring support (5) and the hydraulic housing (2) in
the radial direction (RR), and a separating chamber pin (4),
wherein the pump ring (3) can be pressed in the radial direction
(RR) against an inner wall surface of the hydraulic housing (2) by
means of the separating chamber pin (4) in order to produce an at
least local seal on the hydraulic housing (2), and wherein the
hydraulic housing (2) has a radial offset section (6), along which
an offset element that is formed on the separating chamber pin (4)
or a separate offset element that interacts with the separating
chamber pin (4) can be introduced in the axial direction (AR) and
thus offsets the separating chamber pin (4) and the pump ring (3)
in the radial direction.
2. The pump device according to claim 1, characterized in that the
separating chamber pin (4) can be offset in the radial direction
(RR), in a state in which the pump ring (3) is completely extended
in the axial direction (AR), in order to simultaneously press the
pump ring (3) against the inner wall surface of the hydraulic
housing (2) over its entire effective axial length.
3. The pump device according to claim 1, characterized in that the
radial offset section (6) of the hydraulic housing (2) is formed as
a radial stage.
4. The pump device according to claim 1, characterized in that the
offset element is formed as a single piece with the separating
chamber pin (4).
5. The pump device according to claim 1, characterized in that a
radially outer insertion plane (EE) of a shell surface of the
separating chamber pin (4) extends, without overlap, in the radial
direction (RR) as relates to a pump ring plane (PE) of the pump
ring (3), said pump ring plane to be offset outward radially in the
radial direction when the separating chamber pin (4) is in the
preassembled state.
6. The pump device according to claim 3, characterized in that the
radial stage and the offset element formed on the separating
chamber pin (4) have a corresponding angled ramp (7, 8), by means
of which the separating chamber pin (4) can be displaced in the
axial direction (AR) in order to simultaneously produce a radial
offset of the separating chamber pin (4) and of the pump ring
(3).
7. The pump device according to claim 1, characterized in that the
hydraulic housing (2) forms a mount (9) for the separating chamber
pin (4) on a side axially opposite the radial offset section (6) as
relates to the pump ring support (5), wherein the mount (9) has an
insertion ramp (10) extending at an incline in the radial direction
(RR), by means of which the separating chamber pin (4) can be
displaced and simultaneously offset in the radial direction
(RR).
8. The pump device according to claim 1, further comprising at
least one insertion element (22), the radial extension of which is
dimensioned greater than that of the radial offset section, and
which can be inserted, in the axial direction (AR), into the radial
offset section and, in doing so, offsets the separating chamber pin
(4) and the pump ring (3) exclusively in the radial direction
(RR).
9. The pump device according to claim 8, characterized in that the
hydraulic housing (2) has two axially opposite radial offset
sections and two insertion elements (22) as relates to the pump
ring support (5), wherein a respective insertion element (22) is
insertable into a respective radial offset section in the axial
direction (AR) and, in doing so, offsets the separating chamber pin
(4) and the pump ring (3) from two axially opposite sides,
exclusively in the radial direction (RR).
10. A method for at least locally sealing a pump device for pumping
a fluid, the pump device comprising a hydraulic housing (2), a pump
ring support (5) which is arranged in the hydraulic housing (2), an
elastic pump ring (3) which is arranged between the pump ring
support (5) and the hydraulic housing (2) in the radial direction,
and a separating chamber pin (4), the method comprising initially
positioning the separating chamber pin (4) in a state in which the
pump ring (3) has complete extension in an axial direction and
offsetting the separating chamber pin in the radial direction (RR)
to press the pump ring (3) against the inner wall surface (21) of
the hydraulic housing (2) and produce an at least local seal.
11. The method according to claim 10, wherein the hydraulic housing
(2) has a radial offset section, the method further comprising
introducing an offset element that is formed on the separating
chamber pin (4) or a separate offset element that interacts with
the separating chamber pin (4) along the radial offset section in
the axial direction (AR) to offset the separating chamber pin (4)
and the pump ring (3) in the radial direction (RR).
12. The method according to claim 11, wherein the radial offset
section of the hydraulic housing is formed as a radial stage and
the radial stage and the offset element formed on the separating
chamber pin (4) have a corresponding angled ramp (7, 8), the method
further comprising displacing the separating chamber pin (4) via
the angled ramp in the axial direction in order to simultaneously
offset the separating chamber pin (4) and the pump ring (3) in the
radial direction (RR).
13. The method according to claim 10, wherein the hydraulic housing
(2) forms a mount for the separating chamber pin (4) on a side
axially opposite the radial offset section as relates to the pump
ring support (5), and the mount (9) has an insertion ramp (10)
extending at an incline in the radial direction (RR), the method
comprising displacing the separating chamber pin (4) in the axial
direction (AR) via the insertion ramp (10) extending at an incline
to be simultaneously offset in the radial direction (RR).
14. The method according to claim 10, wherein the pump device (1)
has at least one insertion element (22), the radial extension of
which is dimensioned greater than that of the radial offset
section, the method comprising inserting the at least one insertion
element in the axial direction (AR), into the radial offset section
and, in doing so, offsetting the separating chamber pin (4) and the
pump ring (3) exclusively in the radial direction (RR).
15. The method according to claim 10, wherein the hydraulic housing
(2) has two axially opposite radial offset sections and two
insertion elements (22) as relates to the pump ring support (5),
the method further comprising inserting a respective insertion
element (22) into a respective radial offset section in the axial
direction (AR) and, in doing so, offsetting the separating chamber
pin (4) and the pump ring (3) from two axially opposite sides,
exclusively in the radial direction (RR).
Description
[0001] The invention relates to a pump device and a method for at
least locally sealing the pump device, particularly on an inner
wall surface of the hydraulic housing while using a separating
chamber pin.
[0002] Type-defining pump devices are well-known from the prior
art. For example, publication WO 2016/173800 A1, stemming from the
applicant, discloses a corresponding pump device for pumping and/or
conveying fluids with a hydraulic housing, a pump ring support, and
a pump ring, which is offset by means of a separating chamber pin,
which is also characterized as a clamping element, in order to
separate, with sealing, pump chambers from one another and/or a
suction side from a pressure side of the pump. The pump ring is
characterized also as a membrane by technical experts. During
assembly, the separating chamber pin is pressed axially into the
elastic pump ring and, in doing so, its free front edge displaces
the pump ring in both the axial and radial direction, wherein the
radial offset produces a seal on the inner wall surface of the
hydraulic housing. It is problematic in this case that axial loads
are exerted onto the pump ring, caused by the axial introduction
and/or displacement of the separating chamber pin, and these axial
loads can damage the pump ring or lead to an unequal stress ratio
within the pump ring. The sealing tightness is then not ensured or
at least not over the service life of the pump device.
[0003] Therefore, the object upon which the invention is based is
to provide a pump device, in which the sealing of the pump ring can
take place on the hydraulic housing, wherein the axial forces
acting on the pump ring during assembly are eliminated or at least
reduced.
[0004] This object is achieved by the combination of features
according to claim 1.
[0005] According to the invention, a pump device is proposed for
pumping a fluid, said pump device comprising a hydraulic housing, a
pump ring support which is arranged in the hydraulic housing, an
elastic pump ring which is arranged between the pump ring support
and the hydraulic housing in the radial direction, and a separating
chamber pin.
[0006] The pump ring can be pressed in the radial direction against
an inner wall surface of the hydraulic housing by means of the
separating chamber pin, to produce an at least local seal on the
hydraulic housing, in order to separate pump chambers of the pump
device from one another. The hydraulic housing has a radial offset
section, along which an offset element that is formed on the
separating chamber pin or a separate offset element that interacts
with the separating chamber pin can be introduced in the axial
direction, and thus offsets the separating chamber pin and the pump
ring in the radial direction, in order to produce a radial
compression of the elastic pump ring on the hydraulic housing.
[0007] The provision of the radial offset section provided on the
hydraulic housing and of the offset element acting on the
separating chamber pin makes it possible to guide the separating
chamber pin initially completely or substantially completely
through the pump ring without exerting any significant axial force
onto the pump ring. The pressing of the pump ring onto the
hydraulic housing in the radial direction can advantageously be
effected by the offset element that interacts with the radial
offset section once the separating chamber pin extends the pump
ring in the axial direction. The axial force, which leads to an
undesirable local movement of the pump ring in the axial direction,
and which was previously exerted onto the pump ring during
insertion of the separating chamber pin, can be avoided.
[0008] In an advantageous design variant, the offset element is
formed as one piece on the separating chamber pin, particularly on
its axial edge section, and offsets the separating chamber pin in
the radial direction as soon as it interacts with the radial offset
section. The interaction can be achieved, for example, in that the
offset element is displaced over the radial offset section in the
axial direction and, in doing so, offsets the separating chamber
pin in the radial direction. The one-piece design means that
additional components can be eliminated.
[0009] Furthermore, a design of the pump device is characterized in
that a radially outer insertion plane of a shell surface of the
separating chamber pin extends, without overlap, in the radial
direction as relates to a pump ring plane of the pump ring, said
pump ring plane to be offset outward radially in the radial
direction when the separating chamber pin is in the preassembled
state. The separating chamber pin can hereby be guided to the pump
ring in the axial direction without making contact therewith or at
least without exerting an axial force onto said pump ring. The
insertion plane and the pump ring plane can also coincide. The
preassembled state is the state in which the separating chamber pin
is introduced into the elastic pump ring, but radial compression
has yet to be exerted onto the pump ring.
[0010] Furthermore, a design of the pump device, in which the
separating chamber pin can be offset in the radial direction, in a
state in which the pump ring is completely extended in the axial
direction, is advantageous in order to simultaneously press the
elastic pump ring against the inner wall surface of the hydraulic
housing over its entire effective axial length. To this end, the
separating chamber pin has a sufficient axial length such that it
is initially guided completely through the pump ring in the axial
direction and only subsequently offset as a whole in the radial
direction. Thus, there are no axial forces acting on the pump ring
which could damage it during insertion of the separating chamber
pin.
[0011] In one design variant of the pump device, it is provided
that the radial offset section of the hydraulic housing is formed
as a radial stage. In particular, the radial stage is provided on
an axial insertion section of the hydraulic housing for the
separating chamber pin such that the separating chamber pin can
interact with the radial stage in the axial outer region, i.e.
spaced apart from the pump ring axially, in order to effect the
radial offset of the separating chamber pin and the pump ring.
[0012] In one refinement, the pump device is characterized in that
the radial stage and the offset element formed on the separating
chamber pin have a corresponding angled ramp, by means of which the
separating chamber pin can be displaced in the axial direction in
order to simultaneously produce the radial offset of the separating
chamber pin and of the pump ring. Thus, the separating chamber pin
can be pushed axially, as before, into the pump ring, while the
angled ramps of the radial stage and of the offset element offer a
guide for the separating chamber pin, said guide automatically
offsetting the separating chamber pin in the radial direction upon
complete insertion into the final assembly position.
[0013] Furthermore, one exemplary embodiment of the pump device
provides that the hydraulic housing forms a mount for the
separating chamber pin on a side axially opposite the radial offset
section as relates to the pump ring support. The mount has an
insertion ramp extending at an incline in the radial direction, by
means of which the separating chamber pin can be displaced and
simultaneously offset in the radial direction. The separating
chamber pin can be offset in the radial direction on a second axial
side via the inclined insertion ramp of the mount, and consequently
the separating chamber pin can be offset over its entire axial
length. A design in which the inclined insertion ramp and the
angled ramps have the same angle as relates to an axial extension
of the separating chamber pin is advantageous such that the
separating chamber pin can be offset axially in the radial
direction, the same on both sides.
[0014] In an alternative variant, the pump device further comprises
at least one insertion element, the radial extension of which is
dimensioned greater than that of the radial offset section. The at
least one insertion element can be inserted into the radial offset
section in the axial direction and, in doing so, offsets the
separating chamber pin and the pump ring exclusively in the radial
direction. This means that the number of parts is greater due to
use of an insertion element, but conventional standardized
separating chamber pins can be used which are offset in the radial
direction via the insertion element. An offset element formed on
the separating chamber pin can then be eliminated.
[0015] In one refinement of the pump device, the hydraulic housing
has two axially opposite radial offset sections and two insertion
elements as relates to the pump ring support, wherein a respective
insertion element is insertable into a respective radial offset
section in the axial direction and, in doing so, offsets the
separating chamber pin and the pump ring from two axially opposite
sides, exclusively in the radial direction. By means of this
solution with two insertion elements, the number of parts is again
increased, but the pump ring can experience a uniform radial
compression, from two axial sides, on the hydraulic housing due to
the radial offset of the separating chamber pin.
[0016] The disclosure additionally comprises the method for the at
least local sealing of the previously described pump device,
comprising a hydraulic housing and a drive shaft extending within
the hydraulic housing in the axial direction, a pump ring support
arranged between the hydraulic housing and the drive shaft in the
radial direction, an elastic pump ring arranged between the pump
ring support and the hydraulic housing in the radial direction, and
a separating chamber pin. With the method, the separating chamber
pin is initially positioned in a state in which the pump ring is
completely extended in the axial direction and subsequently offset
in the radial direction. The pump ring is hereby pushed or pressed
against the inner wall surface of the hydraulic housing in order to
produce the at least local seal.
[0017] One design of the method provides that an offset element
that is formed on the separating chamber pin or a separate offset
element that interacts with the separating chamber pin is
introduced in the axial direction, along the radial offset section
of the hydraulic housing, and thus offsets the separating chamber
pin and the pump ring in the radial direction.
[0018] The method further comprises the variant that the radial
offset section formed as the radial stage and the offset element
formed on the separating chamber pin have the corresponding angled
ramp, by means of which the separating chamber pin is pushed in the
axial direction in order to simultaneously offset the separating
chamber pin and the pump ring in the radial direction.
[0019] For the design variant in which the hydraulic housing forms
the mount for the separating chamber pin on the side axially
opposite the radial offset section as relates to the pump ring
support and has the insertion ramp extending at an incline in the
radial direction, the method provides that the separating chamber
pin is pushed in the axial direction via the insertion ramp
extending at an incline and is simultaneously offset in the radial
direction. The pump ring as a whole is hereby pressed against the
inner wall surface of the hydraulic housing from its two axially
opposite sides.
[0020] With the solution in which the pump device has at least one
insertion element, the radial extension of which is dimensioned
greater than that of the radial offset section, the insertion
element is inserted, in one design variant of the method, into the
radial offset section in the axial direction and, in doing so,
offsets the separating chamber pin and the pump ring exclusively in
the radial direction.
[0021] Furthermore, the method comprises the exemplary embodiment
in which the hydraulic housing has two axially opposite radial
offset sections and two insertion elements as relates to the pump
ring support, wherein a respective insertion element is insertable
into a respective radial offset section in the axial direction and,
in doing so, offsets the separating chamber pin and the pump ring
from two axially opposite sides, exclusively in the radial
direction.
[0022] Other advantageous further embodiments of the invention are
characterized in the dependent claims and/or are shown in more
detail in the following by means of the figures, along with the
description of the preferred embodiment of the invention. The
following is shown:
[0023] FIG. 1 a lateral sectional view of a section of a
conventional pump device not in accordance with the invention;
[0024] FIG. 2a a lateral sectional view of a section of a pump
device in a first design variant;
[0025] FIG. 2b the lateral sectional view of the section from FIG.
2a with the separating chamber pin mounted;
[0026] FIG. 3a a lateral sectional view of a section of a pump
device in a second design variant;
[0027] FIG. 3b the lateral sectional view of the section from FIG.
3a with the separating chamber pin mounted;
[0028] FIG. 4 sectional view A-A from FIGS. 2a and 3a;
[0029] FIG. 5 sectional view B-B from FIGS. 2b and 3b;
[0030] Equivalent reference numerals indicate the same technical
elements in all views.
[0031] FIG. 1 shows a lateral sectional view of a section of a
conventional pump device 100 with a hydraulic housing 101, a pump
ring support 103 arranged in the hydraulic housing 101, as well as
an elastic pump ring 102 arranged in between. The pump device 100
is not necessarily prior art but instead only represents the object
achieved by the invention. During assembly, a separating chamber
pin 104 is pushed into the pump ring 102 in the axial direction and
presses, with its free axial and, against the pump ring 102
simultaneously in the axial and radial direction for compression on
the inner wall surface of the hydraulic housing 101, wherein damage
can occur to the pump ring 102 due to the axial force effect.
[0032] FIGS. 2a and 2b show a first design variant of a section of
the pump device 1 in a lateral sectional view, wherein the radial
direction RR extends vertically and the axial direction AR extends
horizontally. Additional components of the pump device 1, such as
the drive motor or the drive shaft, have been omitted for the sake
of clarity. The pump device 1 comprises, as essential components,
the hydraulic housing 2 formed from several parts, the pump ring
support 5, the elastic pump ring 3 arranged between the pump ring
support 5 and the hydraulic housing 2 in the radial direction, and
the separating chamber pin 4. FIG. 2a shows the separating chamber
pin 4 in the preassembled state; FIG. 2b shows it in the final
assembly state. A connection 20 for conveying fluid is shown on an
outer side of the hydraulic housing 2. The hydraulic housing 2 can
also partly be replaced by a flange.
[0033] The hydraulic housing 2 has an insertion channel 12 for the
separating chamber pin 4, on the first axial side of which the
radial offset section 6 formed as the radial stage is provided and
on the second axial side of which the mount 9 for the separating
chamber pin 4 is provided. The radial stage of the radial offset
section 6 on the hydraulic housing 2 forms an angled ramp 7, by
means of which the separating chamber pin 4 can be offset in the
radial direction. In the preassembled position according to FIG.
2a, the radially outer insertion plane EE of the shell surface of
the separating chamber pin 4 extends parallel to and slightly apart
from the pump ring plane PE of the pump ring 3 in the radial
direction such that the separating chamber pin 4 can be guided to
the pump ring 3 in the axial direction, in the state shown in FIG.
2a, without an axial force being exerted onto the pump ring.
[0034] The offset element is formed, in one piece, on the
separating chamber pin 4 as a local thickening 14 in the axial end
section. The transition between the thickening 14 and the rest of
the separating chamber pin 4 likewise occurs via an angled ramp 8,
which is formed according to the angled ramp 7 of the radial stage.
If the separating chamber pin 4 is pushed in the axial direction AR
into its final assembly position according to FIG. 2b, the
separating chamber pin 4 is offset radially outward about the
radial extension of the thickening 14 of the separating chamber pin
4 and simultaneously presses the elastic pump ring 3 against the
inner wall surface 21 of the hydraulic housing 2, as shown in FIG.
2b. To ensure a radial offset of the separating chamber pin 4 over
its entire axial length, the mount 9 has the insertion ramp 10 at
an angle according to the angled ramp 7 of the hydraulic housing 2.
To this end, the separating chamber pin 4 forms a conical taper 11
on its free axial end, said taper being formed according to the
insertion ramp 10 in the design shown. In FIG. 2b, the separating
chamber pin 4 is pushed completely into the mount 9; the seal is
formed between the pump ring 3 and the inner wall surface 21.
[0035] FIGS. 3a and 3b show an alternative variant of the pump
device 1 in sections as lateral side views, wherein the same
features as in FIGS. 2a and 2b are not repeated, but nevertheless
should be considered disclosed. As a variant of the solution
according to FIGS. 2a and 2b, the radial offset section 6 of the
hydraulic housing 2 is at a right angle and formed identically on
both axially opposite sides of the pump ring support 5. In the
preassembled position according to FIG. 3a, the separating chamber
pin 4 is already positioned with the pump ring 3 completely
extended in the axial direction. The insertion plane EE and the
pump ring plane PE coincide without spacing in the exemplary
embodiment shown. A respective insertion element 22 is pushed
axially into the radial offset sections 6 on both sides, the radial
extension of which is dimensioned greater than that of the radial
offset sections 6. On their edge sections facing the separating
chamber pin 4, the insertion elements 22 each have a chamfer 23 in
order to be more easily inserted and, in doing so, to offset the
separating chamber pin 4 and the elastic pump ring 3 exclusively in
the radial direction RR and press them against the inner wall
surface 21 of the hydraulic housing 2.
[0036] FIGS. 4 and 5 show sectional views A-A of FIGS. 2a and 3a
and B-B of FIGS. 2b and 3b, respectively, wherein the radial offset
of the separating chamber pin 4 and the hereby effected pressing of
the pump ring 3 against the inner wall surface 21 of the hydraulic
housing 2 can be seen. Furthermore, radial channels 24 are provided
on the hydraulic housing 2 for establishing a fluid connection with
a pump chamber between the inner wall surface 21 of the hydraulic
housing 2 and the pump ring 3, wherein the pump ring 3 separates
the two radial channels 24, as viewed in the circumferential
direction.
[0037] Even if not shown in the figures, an alternative design also
comprises combining the two exemplary embodiments according to
FIGS. 2a and 2b with one another and providing the solution
according to FIGS. 3a, 3b with rectangular radial offset sections 6
on an axial side and an insertion element 22 on the opposite axial
side and providing a solution according to FIGS. 2a, 2b with
insertion 9, wherein the separating chamber pin 4 is formed on its
two axial sides according to the exemplary embodiments shown.
* * * * *