Abstract: Aiming at the problem of the difficulty in changing the displacement of vehicle scroll compressors, this invention opens a displacement changing control device for scroll compressors that is good for the quick start of the compressor, and can conveniently control the displacement and pressure of the compressor within the set range, and can be used with various kinds of scroll compressors. It includes the case (1). A piston barrel (3) that is used to install the piston control valve (2) that is set in the case (1). An air-intake channel (4) that connects with the piston barrel (3), high pressure feedback channel (7) and displacement adjustment channel (9) that are set on the piston barrel. The piston control valve (2) is located between the air-intake channel (4) and the high pressure feedback channel (7). A spring (10), which has one end that resists the piston control valve (2), is installed in the air-intake channel (4).

Abstract: Aiming at settling the problem of unstable pressure for the existing vehicle scroll compressor and the problem of being unable to create electric automobile air conditioner compressors after appropriate alteration, this invention offers a new type that delivers constant pressure and a fully enclosed scroll compressor. It includes a static disc (1), dynamic disc (2) and crankshaft (5). The static disc (1) is fixed in the case (6). The type line end of the dynamic disc (2) penetrates into the static disc (1). The dynamic disc (2) is connected with the crankshaft (5). The crankshaft (5) is connected with the drive unit (13). The air outlet (9) that connects with the high pressure cavity (10) in the static disc (6) is set on the case (6). The air inlet (8) that connects with the air intake cavity 18 of the static disc (1) is set on the other end of the case (6). Its feature is as follows: the high pressure cavity (10) is connected with a zoom type unloading valve (11) that has adjustable pressure.