Service device for vehicle air conditioning systems, and method for operating same, in particular for the self-cleaning type

A method for operating a servicing device for vehicle air-conditioning systems in particular for the self-cleaning thereof, wherein the servicing device is configured with an emptying device and a filling device for the drawing off of a refrigerant/compressor oil mixture from the refrigerant circuit system of a vehicle air-conditioning system and for the refilling of the vehicle air-conditioning system, said method comprising:

• residual emptying of the refrigerant circuit system of the vehicle air-conditioning system and/or of the servicing device with a vacuum pump;
• refilling the vehicle air-conditioning system, using a refilling system, with at least one of said components selected from the group consisting of refrigerant and compressor oil, the refilling system including a refrigerant reservoir which is under refrigerant pressure;
• connecting directly or indirectly via a connecting line with at least one high pressure servicing connection connector of the service device, an evacuated or at least partially evacuated flushing agent tank and at least one switchover valve block disposed within said servicing device and in fluid connection with a separator stage, with one pressure side of said vacuum pump and with a second pressure side of said vacuum pump, wherein said at least one switchover valve block includes a plurality of valves having:
• a first configuration for said residual emptying, a second configuration for flushing and a third configuration for said refilling with the refrigerant;
• and,
• causing the refrigerant to flow out from the refrigerant reservoir into the flushing agent tank during said flushing and thereby at least partially flushing the refrigerant/compressor oil mixture from the at least one switchover valve block.

A servicing device for use with vehicle air-conditioning systems to empty a refrigerant/compressor oil mixture from a refrigerant circuit system of a vehicle air-conditioning system and to fill the vehicle air-conditioning system with refrigerant, said servicing device comprising:

• at least one switchover valve block within said servicing device and having a plurality of valves, said at least one switchover valve block configured to control fluid flow through the service device, said at least one switchover valve block in fluid communication with a separator stage, one side of a vacuum pump and a second side of said vacuum pump;
• a refrigerant compressor configured to compress refrigerant received from the refrigerant circuit system during the emptying of the refrigerant circuit system;
• the separator stage comprising a separator configured to separate compressor oil from the refrigerant prior to the refrigerant flowing to the refrigerant compressor;
• said vacuum pump configured to create a vacuum to withdraw residual refrigerant/compressor oil mixture from the refrigerant circuit system, the at least one switchover valve block, or combinations thereof;
• a refilling system for refilling the refrigerant circuit system with at least one component selected from the group consisting of refrigerant, compressor oil and additive, said refilling system including a refrigerant reservoir that is configured to contain pressurized refrigerant, the refrigerant reservoir is fluidly connected to the at least one switchover valve block;
• a flushing agent tank fluidly connected to the at least one switchover valve block;
• pressure hoses provided with servicing connection connectors configured to connect to the refrigerant circuit system, the pressure hoses fluidly connected to the at least one switchover valve block to enable fluid to flow between the at least one switchover valve block and the refrigerant circuit system;
• wherein said plurality of valves of the at least one switchover valve block includes a first configuration of said plurality of valves to fluidly connect the vehicle air-conditioning system to the separator during the emptying of the refrigerant/compressor oil mixture from the refrigerant circuit system of the vehicle air-conditioning system;
• wherein said plurality of valves of the at least one switchover valve block includes a second configuration of said plurality of valves to fluidly connect the flushing agent tank to the refrigerant reservoir, the vacuum pump or combinations thereof to cause the at least one switchover valve block to be flushed out and cleaned of residual refrigerant/compressor oil mixture from the refrigerant circuit system that resides in the at least one switchover valve block;
• and
• wherein the at least one switchover valve block includes a third configuration of said plurality of valves to fluidly connect the refrigerant reservoir to the refrigerant circuit system of a vehicle air-conditioning system to fill the refrigerant circuit system with the refrigerant.

A servicing device for use with vehicle air-conditioning systems to empty a refrigerant/compressor oil mixture from a refrigerant circuit system of a vehicle air-conditioning system and to fill the vehicle air-conditioning system with refrigerant and compressor oil, said servicing device comprising:

• a vacuum pump for residual emptying the refrigerant circuit system, the servicing device, or combinations thereof of said refrigerant/compressor oil mixture,
• a refilling system for refilling the vehicle air-conditioning system with at least two components selected from the group consisting of refrigerant, compressor oil and additive,
• a refrigerant reservoir that is configured to be under refrigerant pressure,
• pressure hoses provided with servicing connection connectors configured to connect to the vehicle air-conditioning system being serviced,
• a separator stage comprising at least one separator, a refrigerant compressor, and a refrigerant weighing device;
• at least one pressure or time controlled switchover valve block configured to selectively control a fluidic connection between the refrigerant circuit system of the vehicle air-conditioning system and the separator stage, said at least one switchover valve block in fluid communication with the separator stage, with one side of said vacuum pump and with a second side of said vacuum pump;
• wherein the at least one switchover valve block includes a plurality of valves at least some of which are in a first configuration to fluidly connect the vehicle air-conditioning system to the separator during the emptying of the refrigerant/compressor oil mixture from the refrigerant circuit system of the vehicle air-conditioning system;
• wherein the at least one switchover valve block includes said plurality of valves at least some of which are in a second configuration to fluidly connect the flushing agent tank to the refrigerant reservoir, the vacuum pump or combinations thereof to cause the at least one switchover valve block to be flushed out and cleaned of residual refrigerant/compressor oil mixture from the refrigerant circuit system that resides in the at least one switchover valve block;
• and
• wherein the at least one switchover valve block includes said plurality of valves at least some of which are in a third configuration to fluidly connect the refrigerant reservoir to the refrigerant circuit system of the to fill the refrigerant circuit system with the refrigerant;
• an evacuatable flushing agent tank that is configured to be brought into fluidic flow connection with at least one of the servicing connection connectors via the at least one switchover valve block to enable said at least one switchover valve block to be flushed with fluid, said flushing agent tank also configured to be brought into fluidic flow communication with the refrigerant reservoir via the switchover valve block.