Rotary pump exhibiting an adjustable delivery volume, in particular for adjusting a coolant pump

Patent metadata

Field	Value
Publication number	US-9416786-B2
Application number	US-201313966366-A
Country	US
Kind code	B2
Filing date	Aug 14, 2013
Priority date	Aug 14, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

An adjustable delivery volume rotary pump, including: first and second housing structures; a delivery chamber comprising a first chamber wall formed by the first housing structure, a second chamber wall formed by the second housing structure, a fluid inlet in a low-pressure region and a fluid outlet in a high pressure region; a pump wheel rotatable about a rotational axis in the delivery chamber; and a pressing device for generating pressing force. The second housing structure can be moved relative to the first housing structure from a first to a second position, against the pressing force. In the second position, a gap exists between the first and the second chamber walls and fluid can escape from the delivery chamber by bypassing the inlet and the outlet, or a circulation of the fluid which reduces the delivery rate of the rotary pump arises in the gap within the delivery chamber.

First claim

The invention claimed is:

1. A rotary pump exhibiting an adjustable delivery volume, comprising:
a housing including a first housing structure and a second housing structure;
a delivery chamber comprising a first chamber wall formed by the first housing structure, a second chamber wall formed by the second housing structure, an inlet for a fluid in a low-pressure region and an outlet for the fluid in a high pressure region;
a pump wheel which can be rotated in the delivery chamber about a rotational axis (R); and
a pressing device for generating a pressing force,
wherein the second housing structure can be moved relative to the first housing structure from a first position into a second position, against the pressing force, and in the second position, a gap (G) exists between the first chamber wall and the second chamber wall,
wherein fluid can escape from the delivery chamber by bypassing the inlet and the outlet, and
wherein in the first position, the second housing structure abuts the first housing structure and forms a seal therewith.

2. The rotary pump according to claim 1 , wherein the second chamber wall is an end-facing wall or a region of an end-facing wall of the delivery chamber.

3. The rotary pump according to claim 1 , wherein the second housing structure is a housing cover which closes off the delivery chamber on one end-facing side.

4. The rotary pump according to claim 1 , wherein the second chamber wall limits the low-pressure region.

5. The rotary pump according to claim 4 , wherein the inlet ports into the delivery chamber in the second chamber wall.

6. The rotary pump according to claim 1 , wherein the second housing structure can be tilted or pivoted relative to the first housing structure into the open position.

7. The rotary pump according to claim 6 , wherein a tilting or pivoting axis (T) of the second housing structure extends transverse to the rotational axis (R).

8. The rotary pump according to claim 7 , wherein the tilting or pivoting axis (T) of the second housing structure extends in the vicinity of the guide or through the guide.

9. The rotary pump according to claim 1 , wherein the pressing device presses the second housing structure against the first housing structure in the axial direction.

10. The rotary pump according to claim 1 , wherein the first housing structure comprises an end-facing area on a side which axially faces the second housing structure, and either an internal area which points towards the rotational axis (R) and forms an internal angle with the end-facing area or an external area which points away from the rotational axis (R) and forms an external angle with the end-facing area, and wherein the second housing structure abuts the end-facing area or either the internal area or the external area and can be tilted into the second position about a tilting axis (T) formed in the pressure contact.

11. The rotary pump according to claim 1 , wherein the second housing structure is guided, such that it cannot be rotated about the rotational axis (R), relative to the first housing structure.

12. The rotary pump according to claim 11 , wherein the second housing structure is guided by an axial guide which is joined to the first housing structure in a positive fit, a frictional fit or a material fit and formed on the first housing structure.

13. The rotary pump according to claim 12 , wherein the tilting or pivoting axis (T) of the second housing structure ( 24 ) extends in the vicinity of the guide or through the guide.

14. The rotary pump according to claim 13 , wherein the tilting or pivoting axis extends transverse to a guiding device of the guide.

15. The rotary pump according to claim 1 , wherein the rotary pump comprises one or more side channel stages.

16. The rotary pump according to claim 1 , wherein the rotary pump is a side channel pump.

17. The rotary pump according to claim 1 , wherein the pressing device comprises or is formed by a mechanical spring.

18. The rotary pump according to claim 17 , wherein the spring is a wave ring spring, a helical spring, a disc spring or a leaf spring.

19. The rotary pump according to claim 17 , wherein the spring is pressurised.

20. A pump arrangement for supplying a unit, wherein the pump arrangement comprises a working pump for conveying the working fluid towards or away from the unit, and a rotary pump according to claim 1 ,
wherein the working pump comprises:
a working pump housing;
a drive shaft for rotary-driving the working pump, by the combustion engine and in a fixed rotational speed relationship to it;
a working pump wheel, which can be rotary-driven by the drive shaft and is connected, rotationally fixed, to the drive shaft, for conveying the working fluid;
a setting structure which can be adjusted into different positions relative to the working pump housing by a control fluid, in order to adjust a working pump configuration which influences the delivery volume of the working pump at a given rotational speed; and
a control valve for setting a pressure or volume flow of the control fluid formed by the working fluid, which determines the position of the setting structure, and
wherein the rotary pump is provided for delivering the control fluid to the control valve and is preferably arranged at least partially in the working pump housing.

21. The pump arrangement according to claim 20 , wherein the pump wheel of the rotary pump can be rotary-driven by the drive shaft.

22. The arrangement according to claim 21 , wherein the pump wheel is connected, rotationally fixed, to the drive shaft.

23. The pump arrangement according to claim 20 , wherein the working pump wheel is a radial feed wheel for conveying the working fluid from a radially internal inflow region into a radially more external outflow region and in that the pump configuration which can be adjusted by the setting structure is an adjustable flow geometry.

24. The pump arrangement according to claim 23 , wherein the adjustable flow geometry is a fluid cross-section or flow profile on the flow path of the working fluid which comprises the inflow region, the working pump wheel and the outflow region.

25. The pump arrangement according to claim 20 , wherein the pump arrangement is a coolant pump for a combustion engine.

26. The pump arrangement according to claim 20 , wherein the pump arrangement supplies a unit of a combustion engine with the working fluid.

Assignees

• Shw Automotive Gmbh
• Schwabische Huttenwerke Automotive Gmbh

Inventors

• Welte Claus
• Meinig Uwe

Classifications

• F04D15/0038

  by varying the effective cross-sectional area of flow through the rotor · CPC title

• F04C15/0042

  Systems for the equilibration of forces acting on the machines or pump (interstice adjustment other than by fluid pressure F01C21/102) · CPC title

• F04C2/10

  of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member · CPC title

• F04D5/002 Primary

  Regenerative pumps (for elastic fluids F04D23/008) · CPC title

• F05D2270/64

  Hydraulic actuators · CPC title