PUMP DEVICE

Abstract

A pump device (10) for pumping a fluid, having a hydraulic enclosure (12) that comprises an annular section, a pump ring (14) that is deformable and which defines an annular pump chamber at least in certain regions, a pump ring carrier (16) that is solidly connected to the pump ring (14), a first connector and a second connector, which first connector and which second connector are in fluid communication with the pump chamber, wherein the pump device (10) is set up in such a way that at least one measure influences a parking position of an eccentric (18) such that said parking position is preferred in the region of a clamping member (114), the measure being selected from: a) at least one recess in the hydraulic housing, which recess locally widens the chamber for the pump ring (14) in the axial direction, b) a geometry of the pump ring carrier (16), in which the pump ring carrier (16) has an enlarged diameter on its inner side facing the eccentric (18) in the angular region of the clamping member (114), and c) a geometric configuration of the pump ring (14), which, in the non-installed state of the pump ring (14), provides in one region at least a reduced strength of the pump ring (14), said region being in the clamping member region in the installed state of the pump ring (14), resulting in a reduced axial pressing action of the pump ring (14) in the clamping member region.

Claims

1. A pump device (10, 500) for pumping a fluid, having a hydraulic enclosure (12, 200, 508) that comprises an annular section, a pump ring (14, 400, 506) that is deformable and defines an annular pump chamber (57) at least in certain regions, a pump ring carrier (16, 300, 504) that is solidly connected to the pump ring (14), a first connector (51) and a second connector (52), which first connector (51) and which second connector (52) are in fluid communication with the pump chamber (57), an eccentric (18, 502), which must be driven by a shaft (20) defining an axial and a radial direction such that the eccentric (18, 502) is rotatable relative to the hydraulic enclosure (12, 200, 508), wherein the eccentric (18, 502) is arranged in the pump device (10, 500) in such a manner that the eccentric (18, 502) deforms the pump ring (14, 400, 506) as a function of a current rotating position of the eccentric (18, 502) in such a manner that the pump ring (14, 400, 506) presses against the annular section (22) at least in certain regions in order to convey the fluid along the pump chamber (57) from the first connector (51) to the second connector (52), depending on the current rotating position of the eccentric (18, 502), by rotating the eccentric (18, 502), a clamping member (114), designed to statically press the pump ring (14, 400, 506) against the annular section (22) of the hydraulic enclosure (12, 200, 508) in a clamping member region (45), wherein the pump device (10, 500) is adapted such that by way of at least one measure, a parking position of the eccentric (18, 502) is affected such that it is preferred in the region of the clamping member (114), the measure being selected from: a) at least one recess (202) in the hydraulic enclosure (12, 200, 508) that locally widens the space for the pump ring (14, 400, 506) in the axial direction, b) a geometry of the pump ring carrier (16, 300, 504) that is such that the pump ring carrier (16, 300, 504) features an enlarged diameter (304) on its interior side facing the eccentric (18, 502) in the angular region of the clamping member (114), and c) a geometric configuration of the pump ring (14, 400, 506) which provides at least for a reduced strength of the pump ring (14, 400, 506) in one region in the non-installed state of the pump ring (14, 400, 506), this region being in the clamping member region (45) in the installed state of the pump ring (14, 400, 506), resulting in a reduced axial pressing action of the pump ring (14, 400, 506) in the clamping member region (45).

2. A pump device according to claim 1, in which measure a provides for the at least one recess (202) in the hydraulic enclosure (12, 200, 508) to be graded.

3. A pump device according to claim 1, in which measure a provides for the at least one recess (202) in the hydraulic enclosure (12, 200, 508) to be continuous.

4. A pump device according to claim 1, in which the measure a) provides that the at least one recess (202) in a convex area (204) of the hydraulic enclosure (12, 200, 508) is provided.

5. A pump device according to claim 1, in which the measure a) provides that two recesses (202) are provided, and are provided opposite in the axial direction in the hydraulic enclosure (12, 200, 508).

6. A pump device according to claim 1, in which the measure b) provides that the pump ring carrier (16, 300, 504) features an enlarged diameter on its outer side facing the eccentric (18, 502) in the angular region of the clamping member (114).

7. A pump device according to claim 1, in which the measure c) provides that the pump ring (14, 400, 506) is embodied such that it features an asymmetrical mound in its non-installed state.

8. A pump device according to claim 1, in which the clamping member (114) is designed to statically press at least a portion of the pump ring (14, 400, 506) against the annular section (22) in the clamping member region (45) between the first connector (51) and the second connector (52), and as a result to reduce or prevent a flow of fluid between the first connector (51) and the second connector (52) via the clamping member region (45).

9. A pump ring for a pump device (10, 500), in particular a pump device (10, 500) according to claim 1, in which the pump ring (14, 400, 506) provides for a reduced strength of the pump ring (14, 400, 506) in one region, said region being in the clamping member region (45) in the installed state of the pump ring (14, 400, 506), resulting in a reduced axial pressing action of the pump ring (14, 400, 506) in the clamping member region (45).

10. A pump ring according to claim 9, featuring an asymmetrical mound.

Description

[0031] The invention is schematically shown in the drawings based on embodiments, schematically and extensively described with reference to the drawings. The figures show as follows:

[0032] FIG. 1: a sectional view of a pump device;

[0033] FIG. 2: a side view of the pump device of FIG. 1;

[0034] FIG. 3: a sectional view of the pump device of FIG. 1;

[0035] FIG. 4: a cross-section of a hydraulic enclosure with a recess;

[0036] FIG. 5: an embodiment of a pump ring carrier,

[0037] FIG. 6: an embodiment of a pump ring in a sectional view;

[0038] FIG. 7: a pump arrangement, in order to clarify different positions of the eccentric.

[0039] FIGS. 1 through 3 are shown primarily in order to explain the operation of a pump device of the type described here without addressing the special features of the pump device proposed here in detail.

[0040] FIG. 1 shows a sectional view of a pump device, referred to in general with reference number 10, and embodied here as an orbital pump. The illustration shows a hydraulic enclosure 12, a pump ring 14, a pump ring carrier 16, an eccentric 18, a shaft 20, a drive 140, a first bearing 110, a second bearing 118, a socket 112 that may also be described as a ring 112, a clamping member 114 that may also be described as a separating chamber pin, an eccentric bearing 116, and a sealing ring 120 that may also be described as a sealing disk 120.

[0041] The first bearing 110 in this embodiment is mounted as a floating bearing, and the second bearing 118 is mounted as a fixed bearing. This provides for quality bearing.

[0042] By way of eccentric bearing 116, a needle bearing may be used. This bearing has a limited radial extension. Other bearing types are conceivable as well, for instance rolling bearings. The eccentric bearing 116 allows for a low-friction transfer of forces between the rotating eccentric 18 and the torque-proof pump ring 14 or pump ring carrier 16.

[0043] The hydraulic enclosure 12 comprises an annular section 22 as well as a first lateral section 24 that may also be described as a pump cover, and a second lateral section 26 that may also be described as a motor flange or as a drive flange. The two lateral sections 24, 26 are arranged opposite each other. The pump ring 14 is located at least partially between the two lateral sections 24, 26 of the hydraulic enclosure 12. The annular section 22 has a first collar 74 and a second collar 75.

[0044] The drive 140 has a stator arrangement 145 as well as a rotor arrangement 146. The drive 140 partially attached to a tubular area 170 of the second lateral section 26.

[0045] The pump enclosure 12 has a locking pin 27, designed to snap into place when the clamping member 114 is inserted into the pump enclosure 12 and to axially ensure the clamping member 114. The introduction of the clamping member 114 may take place prior to the assembly of the drive 140.

[0046] The pump ring 14 is deformable and may be made out of an elastomeric material or of another deformable material.

[0047] FIG. 2 shows a side view of the pump device 10 of FIG. 1.

[0048] FIG. 3 shows a section across the pump device 10, seen along section line III-III in FIG. 2. A first connector 51 and a second connector 52 are provided, which connectors 51, 52 are in fluid communication with a pump chamber 57, which is formed between the annular section 22 of the hydraulic enclosure and a running surface 46 of the pump ring, and which in the illustration of FIG. 3 extends annularly and clockwise from the first connector 51 to the second connector 52. In the section extending counterclockwise from the first connector 51 to the second connector 52, the pump chamber 57 is deactivated by the clamping member 114 in that the clamping member 114 statically presses the running surface 46 of the pump ring 14 against the annular section 22 of the hydraulic enclosure 12, thus preventing a flow of fluid through this section, or at least powerfully reducing it. The region in which the clamping member 114 presses the running surface 46 of the pump ring 14 against the annular section 22 will also be referred to hereinafter as the clamping member region 45.

[0049] The illustration of the interior of the hydraulic enclosure 12 is schematic and exaggerates the deformation of the pump ring 14 in order to clarify the principle.

[0050] The functionality of the orbital pump is described below based on FIG. 1 and FIG. 3.

[0051] The eccentric 18 is supported on the shaft 20 and is driven by it. The drive 140, typically a motor or an electric motor, serves in turn for driving the shaft 20. According to one embodiment, a controllable drive 140 is provided by way of drive 140.

[0052] The shaft 20 is rotated around its longitudinal axis 21, which defines an axial direction of the pump device 10. The eccentric 18 is therefore also moved into a rotation around the longitudinal axis of the shaft 20. This movement of the eccentric 18 is transmitted to the pump ring 14 via the bearing 116 and via the pump ring carrier 16. The pump ring carrier 16 and the pump ring 14 are connected in a torque-proof connection relative to the hydraulic enclosure 12, but they are moved locally toward or away from the annular section 22, depending on the rotating position of the eccentric 18. FIG. 3 shows the eccentric 18 in a direction marked by an arrow 19, pointing in the shown example at 9 o'clock, in other words, the region of the eccentric 18 with the greatest radial extension shows in the direction of the arrow 19. This causes the pump ring 14 to be moved in this direction 19 and to be pressed against the annular section 22 in the region 58. This causes the pump channel 57 to be reduced or fully blocked in region 58.

[0053] When the eccentric rotates clockwise, the location 58, at which the pump ring 14 is pressed against the annular section 22, moves clockwise as well, such that the fluid in the pump chamber 57 is pumped or transported clockwise from the first connector 51 to the second connector 52. A fluid bypass via which the fluid moves clockwise from the second connector 52 to the first connector 51 is prevented by the clamping member 114 or by another interruption of the pump chamber 57 in this region.

[0054] The pump device 10 also functions in the opposite direction as a result of a reversal of the rotational directions of the eccentric 18.

[0055] FIG. 4 [shows] a section of a hydraulic enclosure 200 with a recess 202 formed in a convex region 204 of the hydraulic enclosure 200. Via this recess 202 in convex region 204 in the region of the clamping member and the resulting rigidity jump via the smaller axial pressing action of the pump ring, the park position detection of the eccentric improves in the 0 position. This recess may be provided as a graded and/or as a flowing transition.

[0056] FIG. 5 shows a top view of an embodiment of a pump ring carrier, referred to in general with reference number 300. The figures in the illustration are only exemplary, and are in no way restrictive. In this pump ring carrier 300, a recess is provided circumferentially in the side wan, which is not shown in this illustration, and in which the pump ring (not shown) is at least partially provided.

[0057] The illustration further shows a pump ring carrier recess 302 in the circumferential region of the pump ring carrier 300, into which the clamping member (not shown) is to be inserted. The pump ring 300 further has an enlarged diameter 304 on the interior side facing the eccentric (not shown) in the angular region of the clamping member, which may be in the range of 1/10 mm, resulting in an out-of-roundness. The out-of-roundness in the direction of the clamping member leads to a lower mechanical strain in that direction as compared to other directions. As a result, the eccentric can park more easily in the 0 position.

[0058] FIG. 6 shows a sectional view of an embodiment of a pump ring, referred to in general with reference number 400. In one region 402, it features a mound, marked by the arrows 404 and the dotted lines 406. This region, which may comprise the entire extensive region of the pump ring 400 except for the clamping member region, therefore has an increased strength. This results in turn in a reduced strength of the pump ring in the region that is in the clamping member region in the installed state of the pump ring 400. This results in a reduced axial pressing action of the built-in pump ring 400 in the clamping member region.

[0059] Due to the asymmetrical mound of the pump ring 400, there is therefore a lower axial pressing action in the region of the clamping member than in the remaining part of the pump ring 400. With the lower axial pressing action, the detection of the eccentric improves in direction 0.

[0060] The respective listed measures a, b, c individually or in any combination, favor a rotating position of the eccentric in the zero position, that is in the direction of the clamping member 114, since in this region, the pump ring 14 can be easily moved by distance 48 towards the clamping member 114. The zero position as a parking position is advantageous, since in the other positions there is an increased risk that the pressure difference between outlet and intake exercises a moment on the eccentric that leads to a rotation of the eccentric 18 when it is not held by the shaft 20 (cf. FIG. 1).

[0061] FIG. 7 shows a schematic view of a pump device 500, of which an eccentric 502, a pump ring carrier 504, a pump ring 506, and a hydraulic enclosure 508 are shown. An arrow 510 shows the rotation of the eccentric. The illustration shows different rotating positions of the eccentric 502, specifically 0, 90, 180, and 270. These are possible rotating positions, and therefore also parking positions of the eccentric 502. The stated measures are intended to reach a parking position of the eccentric 502 of 0.

[0062] On the left side of the illustration, a graph 550 is shown, the X-axis of which shows the rotation angle of the eccentric 502, and the Y-axis of which shows the pressure. The graph 550 therefore clarifies the development of the pressure as a function of the rotation angle of the eccentric 502.

[0063] Naturally, the present invention allows for many possible variations and modifications.