Air Conditioning Compressor Comprising a Differential Pressure Control Device
An air conditioning compressor for air conditioning systems in motor vehicles, wherein the air conditioning compressor at the high pressure output comprises a check valve and a pressure control device, for example a pressure control valve or a bursting disk.
The invention relates to an air conditioning compressor for air conditioning systems in motor vehicles, wherein the air conditioning compressor comprises a check valve and a pressure control device at the high pressure outlet.
Compressors of this type are known. The integration of the check valve is required to improve the starting behavior of the displacement-adjustable compressor and to safeguard the coupling-free drive of the compressor for the switched-off air conditioning operation. This check valve is installed in the high pressure region of the system and, at least in the case of a pressure gradient counter to the throughput direction of the check valve in the high pressure side, divides the high pressure side into two partial regions.
Furthermore, according to the state of the art, a pressure control valve is integrated on the high pressure side in the air conditioning compressor, the valve being disposed downstream in front of the check valve. This means that in the event of a pressure gradient at the check valve counter to the throughput direction of the check valve, which is to say during a pressure increase in the remaining high pressure region of the air conditioning system, the high pressure cannot be relieved via the pressure control valve.
It is therefore the object of the invention to implement an air conditioning compressor and/or an air conditioning system, which are not associated with these problems.
The task is solved by an air conditioning compressor for air conditioning systems in motor vehicles, wherein the air conditioning compressor comprises a check valve and a pressure control device on the high pressure outlet, for example a pressure control valve or a bursting disk, wherein the pressure control device is disposed downstream behind the check valve and wherein a differential pressure control device is disposed in parallel to the check valve. Preferably an air conditioning compressor is used, wherein the differential pressure control device acts in both flow directions, which is to say both in the flow direction from the air conditioning compressor into the air conditioning system, and also in the opposite flow direction. This has the advantage that even if a check valve is used, pressure control is guaranteed for the entire high pressure region of the air conditioning system upstream and downstream of the check valve.
In addition, an air conditioning compressor is preferred, wherein the differential pressure control device is a valve device, which is to say a device that is reversible and reusable.
Furthermore, an air conditioning compressor is preferred, wherein the differential pressure control device is a bursting disk.
A further air conditioning compressor according to the invention is characterized in that the bursting disk is integrated in the check valve. Also preferred is an air conditioning compressor, wherein the pressure differential for triggering the bursting disk is greater than the pressure differential for the check valve. This has the advantage that first a pressure increase beyond the maximum pressure can act at the compressor outlet via the check valve onto the pressure control valve disposed downstream thereof. Only if the check valve jams or fails will the differential pressure control be triggered and connect the elevated pressure at the compressor outlet to the pressure control valve in the other part of the high pressure line of the air conditioning system.
Furthermore, a compressor is preferred, wherein the differential pressure control device on the high pressure side of the air conditioning system connects the air conditioning compressor and the remaining high pressure part of the air conditioning system, which is to say both system parts, to the actual pressure control valve.
The invention will be explained on the basis of the figures.
The higher pressure differential is particularly necessary for safeguarding the differential pressure in the event a bursting disk 25 is used within the check valve 29, as is shown in
- 1 Air conditioning compressor
- 3 Check valve
- 5 Gas cooler
- 7 Inner heat exchanger
- 9 Expansion valve
- 11 Outlet line
- 13 Compressor housing
- 15 Pressure control device
- 17 Differential pressure control device
- 19 Check valve
- 21 Check valve
- 23 High pressure region of the air conditioning system
- 25 Bursting disk
- 29 Check valve
- 31 Piston of the check valve 29
- 33 Valve housing
- 35 Helical spring
- 37 Valve seat
- 39 Line to the outlet line 11
- 41 Line between the air conditioning compressor 1 and the high pressure region 23
Claims
1. An air conditioning compressor for air conditioning systems in motor vehicles, the air conditioning compressor at the high pressure output comprising a check valve and a pressure control device, for example a pressure control valve or a bursting disk, wherein the pressure control device is disposed downstream behind the check valve and that a differential pressure control device is disposed parallel in to the check valve.
2. The air conditioning compressor according to claim 1, wherein the differential pressure control device acts in both flow directions, which is to say both in the flow direction from the air conditioning compressor into the air conditioning system, and also in the opposite flow direction.
3. The air conditioning compressor according to claim 1, wherein the differential pressure control device is a valve device, which is to say it is reversible and reusable.
4. The air conditioning compressor according to claim 1, wherein the differential pressure control device is a bursting disk.
5. The air conditioning compressor according to claim 4, wherein the bursting disk is integrated in the check valve.
6. The air conditioning compressor according to claim 4, wherein the pressure differential for triggering the bursting disk is greater than the pressure differential on the check valve.
7. An air conditioning compressor according claim 1, wherein the differential pressure control device on the high pressure side of the air conditioning system connects the air conditioning compressor and the remaining high pressure side of the air conditioning system, which is to say both system parts, to the actual pressure control valve.
Type: Application
Filed: Nov 4, 2006
Publication Date: Nov 20, 2008
Inventors: Willi Parsch (Seeheim), Thomas Di Vito (Wehrheim), Jan Hinrichs (Friedrichsdorf), Robert Mager (Munchen), Jurgen Wertenbach (Fellbach)
Application Number: 12/092,810
International Classification: F25B 41/06 (20060101);