Gas pump with a sealing oil groove

Patent metadata

Field	Value
Publication number	US-9546658-B2
Application number	US-201314101510-A
Country	US
Kind code	B2
Filing date	Dec 10, 2013
Priority date	Dec 11, 2012
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A gas pump including a first housing part ( 1 ) comprising a sealing surface ( 6 ); a second housing part ( 2 ) comprising a sealing surface ( 7 ); a delivery chamber ( 3 ) comprising an inlet ( 4 ) and an outlet ( 5 ) for a gas; and a delivery device ( 11, 12 ), which can be moved within the delivery chamber ( 3 ), for delivering the gas, wherein the housing parts ( 1, 2 ) are joined to each other such that they at least partially enclose the delivery chamber ( 3 ) over a circumference of the chamber, and such that their sealing surfaces ( 6, 7 ) abut each other in order to seal off the delivery chamber ( 3 ), and wherein a sealing recess ( 9 ) extends in at least one of the sealing surfaces ( 6, 7 ) around the delivery chamber ( 3 ) and is filled with a sealing liquid when the gas pump is in operation.

First claim

What is claimed:

1. A gas pump, comprising:
a first housing part comprising a first sealing surface;
a second housing part comprising a second sealing surface;
a delivery chamber comprising an inlet and an outlet for a gas; and
a delivery device, which is movable within the delivery chamber, for delivering the gas,
wherein the first and second housing parts are joined to each other such that they at least partially enclose the delivery chamber over a circumference of the chamber, and such that the first and second sealing surfaces abut each other in order to seal off the delivery chamber, and wherein a sealing recess extends in at least one of the first and second sealing surfaces around the delivery chamber and is filled with a sealing liquid when the gas pump is in operation; and
wherein the gas pump is a negative pressure pump for supplying one or more assemblies with negative pressure and wherein a liquid lubricant, which serves to lubricate the delivery device or seal off delivery cells within the delivery chamber, also forms the sealing liquid.

2. The gas pump according to claim 1 , wherein the one or more assemblies are part of a motor vehicle.

3. The gas pump according to claim 1 , wherein the sealing recess is connected via a feed to a reservoir or circulation of the sealing liquid, such that the sealing liquid can be fed to the sealing recess.

4. The gas pump according to claim 1 , wherein a feed for the lubricant is connected to the sealing recess and/or in that lubricant which serves as the sealing liquid in the sealing recess can penetrate from the sealing recess into the delivery chamber.

5. A gas pump according to claim 1 , wherein a liquid pump is provided for supplying an assembly with a liquid which also forms the sealing liquid;
the liquid pump comprises a delivery chamber and a delivery device which can be moved within the delivery chamber, and the delivery chamber comprises an inlet on a low-pressure side of the liquid pump and an outlet on a high-pressure side of the liquid pump, for the liquid; and
a feed is provided which connects the sealing recess to the low-pressure side or the high pressure side of the liquid pump.

6. A gas pump according to claim 5 , wherein the liquid pump is a lubricant pump and the liquid is a lubricant which serves to lubricate the assembly.

7. The gas pump according to claim 5 , wherein one of the first and second housing parts of the gas pump forms one or more chamber walls of the delivery chamber of the liquid pump.

8. The gas pump according to claim 7 , wherein the first and second housing parts of the gas pump form a front-facing wall and a circumferential wall.

9. The gas pump according to claim 5 , wherein a feed diverges on the high pressure side of the liquid pump and is connected to the sealing recess such that liquid delivered by the liquid pump can pass through the feed into the sealing recess.

10. The gas pump according to claim 9 , wherein the feed diverges on the high pressure side of the liquid pump downstream of the delivery chamber of the liquid pump.

11. The gas pump according to claim 5 , wherein a filter device for cleaning the liquid is provided downstream of the delivery chamber of the liquid pump and the feed diverges downstream of the filter device.

12. The gas pump according to claim 11 , wherein the filter device is upstream of the assembly to be supplied and the feed diverges upstream of the assembly.

13. The gas pump according to claim 5 , wherein a feed which diverges on the low pressure side of the liquid pump is connected to the sealing recess such that liquid suctioned by the liquid pump can pass into the sealing recess.

14. The gas pump according to claim 5 , wherein the feed diverges within a housing of the liquid pump.

15. The gas pump according to claim 14 , wherein the feed diverges within a housing of the liquid pump on the low-pressure side of the liquid pump upstream of the delivery chamber of the liquid pump.

16. The gas pump according to claim 1 , wherein the sealing recess can be supplied with the sealing liquid via a feed which diverges at a point of divergence from a supply system for supplying an assembly with a liquid, and the point of divergence or a portion of the feed which extends between the point of divergence and the sealing recess is geodetically higher than a liquid level which is established in the supply system when the gas pump, or a liquid pump which serves to deliver the liquid in the supply system, is at a stop.

17. The gas pump according to claim 1 , wherein the gas pump is arranged at least partially immersed in liquid and the liquid at least partially surrounds the sealing surfaces on an exterior side which faces away from the delivery chamber of the gas pump.

18. The gas pump according to claim 1 , wherein the gas pump is arranged on a combustion engine or driven by the combustion engine, and a lubricating liquid which serves to lubricate the combustion engine forms the sealing liquid.

19. The gas pump according to claim 1 , wherein the delivery device of the gas pump and a delivery device of a liquid pump are arranged in a housing which comprises the first and second housing parts, such that they can be moved and/or rotated.

20. The gas pump according to claim 19 , wherein the delivery devices can be rotated about the same rotational axis.

21. A vehicle comprising: a combustion engine;
a gas pump according to claim 1 ;
an assembly to which negative pressure or positive pressure relative to the ambient pressure of the vehicle can be applied by means of the gas pump; and
a lubricant circulation for supplying each of the combustion engine and the gas pump with liquid lubricant, wherein the sealing recess which serves to seal off the gas pump is connected to the lubricant circulation, such that the lubricant forms the sealing liquid.

22. The vehicle according to claim 21 , wherein the gas pump is mechanically coupled to the combustion engine in order to be driven thereby.

Assignees

• Shw Automotive Gmbh

Inventors

• Bohner Jürgen
• Peters Sven

Classifications

• F01C21/10

  Outer members for co-operation with rotary pistons; Casings (casings for rotary engines or machines in general F16M) · CPC title

• F04C25/02

  for producing high vacuum (sealing arrangements F04C27/00; silencing F04C29/06) · CPC title

• F04C2/356

  with vanes reciprocating with respect to the outer member · CPC title

• F04C18/3442

  the surfaces of the inner and outer member, forming the inlet and outlet opening · CPC title

• F04C29/025

  using a lubricant pump · CPC title