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.

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

[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.