Pump assembly

Abstract

The invention relates to a pump unit (10) comprising an inner rotor (12), an outer rotor (14), and a housing (16), wherein the inner rotor (12) has a predetermined position (18) relative to the housing (16), the predetermined position (18) being configured to space a rotation axis (20) of the outer rotor (14) apart from a reference (22) of the housing (16), so that a radial gap (24) between the outer rotor (14) and the inner rotor (12) is reduced, wherein the pump unit (10) is configured to pump a fluid by rotating the inner rotor (12) and / or the outer rotor (14).

Description

[0001] The present invention relates to a pump unit, a method for manufacturing a pump unit, a system and a vehicle.

[0002] Currently, a wide variety of pumps, geometries, and solutions exist for conveying fluids. Due to increasing efficiency expectations for pumps, as well as heightened energy efficiency requirements, the need for innovative and robust pumping solutions is constantly growing.

[0003] The continuous reduction of weight in the vehicle sector to reduce fuel consumption, as well as increasing competition, is causing cost pressure, leading to a greater demand for cheaper and more efficient vehicle components. Disclosure of the invention

[0004] The pump unit according to the invention, with the features of claim 1, has the advantage over the known design that the form and positional tolerances of the inner rotor, the outer rotor, and other components of the pump unit can be reduced, thus simplifying manufacturing and reducing costs. Furthermore, the efficiency of the pump unit can preferably be increased by the smaller radial gap, particularly at higher pressures. The performance stability of the pump unit can also preferably be increased, especially at high pressures. The reduction of the radial gap of the pump unit is also preferably self-regulating through the hydraulic operating principle by means of the spacing of the outer rotor from the reference point of the housing. Furthermore, the pump unit can preferably operate in a direction-neutral manner.

[0005] According to the invention, this is achieved by the pump unit having an inner rotor, an outer rotor and a housing, wherein the inner rotor has a predetermined position relative to the housing, wherein the predetermined position is configured to space a rotation axis of the outer rotor away from a reference of the housing, so that a radial gap between the outer rotor and the inner rotor is reduced, wherein the pump unit is configured to pump and / or compress a fluid by rotating the inner rotor and / or the outer rotor.

[0006] In other words, the outer rotor can also align itself concentrically with the housing bore due to a hydrodynamic bearing condition, thus closing the radial gap. Preferably, the housing can have a bore in which the outer rotor runs or rotates. Preferably, the bore is larger than the outer rotor by a certain amount or clearance. The clearance between the housing and the outer rotor can generate a directed force via the existing pressure gradient. Preferably, the bore can be positioned eccentrically relative to the outer rotor, so that the resulting total force reduces the tooth head gap or radial gap, thereby increasing efficiency.Preferably, a one-sided reduction of the clearance between the outer rotor and the housing can be achieved by different geometries of the housing bore in the housing, whereby the resulting force is preferably directed in one direction so that the outer rotor is still adequately supported.

[0007] The dependent claims preferably describe further developments of the invention.

[0008] Preferably, the reference of the housing is a center point of a first cross-sectional area of ​​a housing bore in the housing in which the inner rotor and the outer rotor are arranged.

[0009] An advantage of this embodiment is that by offsetting the housing's reference point from the center point, a fluid within the housing is compressed, thus reducing the radial gap. Preferably, the housing can also have any other type of bore and / or recess, such as round, elliptical, or similar.

[0010] Preferably, the outer rotor has a second cross-sectional area, wherein a first diagonal of the first cross-sectional area and a diagonal of the second cross-sectional area form a ratio, wherein the predetermined position is spaced from the center point by the value of the ratio.

[0011] One advantage of this embodiment is that it was surprisingly found experimentally that the pump unit is vibration-damping at such a spacing.

[0012] Furthermore, the predetermined position is preferably set up to reduce the radial gap by reducing the distance between the outer surface of the outer rotor and the housing.

[0013] An advantage of this embodiment is that by adjusting the distance between the outer surface of the outer rotor and the housing, in particular a wall of the housing bore, a force can be set which can be generated by the compression of a fluid in the pump unit, in order to reduce the radial gap.

[0014] Preferably, the pump unit is configured to generate a force, by means of the predetermined position and rotation of the outer rotor, which is designed to reduce the radial gap.

[0015] One advantage of this embodiment is that the rotation of the outer rotor, or an angular velocity or similar, can be specifically adjusted in order to create a force that acts on the outer rotor, thus reducing the radial gap.

[0016] Preferably, the predetermined position is set up to position the outer rotor eccentrically to the housing.

[0017] An advantage of this embodiment is that the radial gap between the teeth of the inner rotor and the teeth of the outer rotor can be reduced, thus increasing the pumping action and the efficiency of the pump unit. Eccentricity can, in particular, mean that the axis of rotation of the housing bore is offset from the axis of rotation of the outer rotor.

[0018] Preferably, the inner rotor has a rotation axis which is arranged at the predetermined position.

[0019] One advantage of this embodiment is that by arranging the inner rotor offset to an axis of symmetry of the housing, the radial gap between the interior and the outer rotor can be reduced.

[0020] Further preferably, the inner rotor has a first toothing for driving the inner rotor, wherein the inner rotor has a second toothing which is configured to convey a fluid, wherein the outer rotor has a third toothing which is configured to engage with the second toothing in order to convey the fluid.

[0021] An advantage of this embodiment is that high pump efficiency can be achieved through the engagement of the gears. Preferably, the pump unit is a gerotor pump. More preferably, both the inner and outer rotors can be manufactured, in particular by means of a sintering process, or milled, eroded, or similarly machined from solid material.

[0022] Another aspect concerns a process for manufacturing a pump unit, as described above and below, which includes the following steps: Providing a housing with a housing bore, arranging an outer rotor in the housing bore such that a rotation axis of the outer rotor is arranged at a predetermined position, the predetermined position being configured to reduce a radial gap between the outer rotor and an inner rotor.

[0023] Another aspect of the invention relates to a vehicle and / or a system which has a pump unit as described above and below and / or has a pump which was manufactured using the method as described above and below. Drawings

[0024] Exemplary embodiments of the invention are described below with reference to the accompanying drawings. The drawing shows: Fig. 1 a pump unit according to one embodiment, Fig. 2 a flowchart to illustrate steps of the method according to one embodiment, Fig. 3 a vehicle according to one embodiment, Fig. 4 a plant according to one embodiment. Embodiments of the invention

[0025] Fig. 1 Figure 1 shows a pump unit 10 according to one embodiment. The pump unit 10 has an inner rotor 12, an outer rotor 14, and a housing 16. Preferably, the inner rotor 12 has a predetermined position 18 relative to the housing 16, wherein the predetermined position 18 is configured to space a rotation axis 20 of the outer rotor 14 apart from a reference 22 of the housing 16, thus reducing a radial gap 24 between the outer rotor 14 and the inner rotor 12. The pump unit 10 is configured to pump a fluid by rotating the inner rotor 12 and / or the outer rotor 14.

[0026] As in the Fig. 1As shown, the housing 16 has a housing bore 30, wherein the reference 22 of the housing 16 is preferably a center point 26 of a first cross-sectional area 28. Thus, in particular, the axis of rotation 20 of the outer rotor 14 can be spaced apart from the center point 26 of a first cross-sectional area 28 of a housing bore 30. More preferably, a first diagonal 36 of the first cross-sectional area 28 and a second diagonal 38 of a second cross-sectional area 34 of the outer rotor 14 can form a ratio, wherein the predetermined position 18 is spaced apart from the center point by the value of the ratio.

[0027] The outer rotor 14 preferably has an outer surface 40, wherein the distance between the outer surface 40 and the housing 16 or a wall of the housing bore 30 can be reduced in order to reduce the radial gap 24. The inner rotor 12 preferably has a rotation axis 42, which is arranged at the predetermined position 18. Furthermore, the inner rotor 12 preferably has a first toothing 46 for driving the inner rotor 12. Preferably, the inner rotor has a second toothing 48, in particular for conveying a fluid. Furthermore, the outer rotor 14 preferably has a third toothing 50, which is configured to engage with the second toothing 48 in order to convey the fluid.

[0028] Figure 2Figure 1 shows a flowchart illustrating the steps of method 100 according to one embodiment. Method 100 for manufacturing a pump unit 10, as described above and below, comprises the following steps: Providing S1 of a housing 16 with a housing bore 30, arranging S2 of an outer rotor 14 in the housing bore 30 such that a rotation axis 20 of the outer rotor 14 is arranged at a predetermined position 18, wherein the predetermined position 18 is configured to reduce a radial gap 24 between the outer rotor 14 and an inner rotor 12.

[0029] Fig. 3 Figure 200 shows a vehicle 200 according to one embodiment. The vehicle 200 preferably has a pump unit 10, as described above and below, and / or a pump 202, which was manufactured using the method 100, as described above and below.

[0030] Fig.4Figure 300 shows an embodiment of the system. The system 300 preferably comprises a pump unit 10, as described above and below, and / or a pump 202, which was manufactured using the method 100, as described above and below. Reference symbol list

[0031] 10 Pump unit 12 Inner rotor 14 Outer rotor 16 Housing 18 Predetermined position 20 Axis of rotation 22 Reference 24 Radial gap 26 Center point 28 First cross-sectional area 30 Housing bore 34 Second cross-sectional area 36 First diagonal 38 Second diagonal 40 Outer surface 42 Axis of rotation 46 First tooth 48 Second tooth 50 Third tooth 100 Method for manufacturing a pump unit S1 Providing a housing S2 Arranging an outer rotor 200 Vehicle 202 Pump 300 Plant

Claims

1. Pump unit (10) comprising: - an inner rotor (12), - an outer rotor (14), - a housing (16), wherein the inner rotor (12) has a predetermined position (18) relative to the housing (16), wherein the predetermined position (18) is configured to space a rotation axis (20) of the outer rotor (14) apart from a reference (22) of the housing (16) so that a radial gap (24) between the outer rotor (14) and the inner rotor (12) is reduced, wherein the pump unit (10) is configured to pump and / or compress a fluid by rotating the inner rotor (12) and / or the outer rotor (14).

2. Pump unit (10) according to claim 1, wherein the reference (22) of the housing (16) is a center point (26) of a first cross-sectional area (28) of a housing bore (30) in the housing (16) in which the inner rotor (12) and the outer rotor (14) are arranged.

3. Pump unit (10) according to claim 2, wherein the outer rotor (14) has a second cross-sectional area (34), wherein a first diagonal (36) of the first cross-sectional area (28) and a second diagonal (38) of the second cross-sectional area (34) form a ratio, wherein the predetermined position (18) is spaced from the center point (26) by the value of the ratio.

4. Pump unit (10) according to one of the preceding claims, wherein the predetermined position (18) is configured to reduce the radial gap (24) by reducing a distance between an outer surface (40) of the outer rotor (14) and the housing (16).

5. Pump unit (10) according to claim 4, wherein the pump unit (10) is configured to generate a force by means of the predetermined position (18) and the rotation of the outer rotor (14) which is configured to reduce the radial gap (24).

6. Pump unit (10) according to one of the preceding claims, wherein the predetermined position (18) is configured to position the outer rotor (18) eccentrically to the housing (16).

7. Pump unit (10) according to one of the preceding claims, wherein the inner rotor (12) has a rotation axis (42) which is arranged at the predetermined position (18).

8. Pump unit (10) according to one of the preceding claims, wherein the inner rotor (12) has a first toothing (40) for driving the inner rotor (12), wherein the inner rotor (12) has a second toothing (48) which is configured to pump a fluid, wherein the outer rotor (14) has a third toothing (50) which is configured to engage with the second toothing (48) in order to pump the fluid.

9. Method (100) for manufacturing a pump unit (10) according to any one of the preceding claims 1 to 8, comprising the steps: - providing (S1) a housing (16) with a housing bore (30), - arranging (S2) an outer rotor (14) in the housing bore (30) such that an axis of rotation (20) of the outer rotor (14) is at a predetermined position (18), wherein the predetermined position (18) is configured to reduce a radial gap (24) between the outer rotor (14) and the inner rotor (12).

10. Vehicle (200) and / or system (300) comprising a pump unit (10) according to any one of claims 1 to 8 and / or a pump (202) which was manufactured by the method (100) according to claim 9.

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