| 摘要 |
PURPOSE: A scroll type compressor is provided to improve the controllability and the responsibility of a backpressure control valve. CONSTITUTION: A scroll type compressor comprises a housing, a fixed scroll, a movable scroll, a suction chamber(42), a compression chamber, an ejection chamber(47), and a back pressure chamber(39). The fixed scroll and the movable scroll are pressurized each other by the back pressure within the back pressure chamber. A back pressure control valve(72) is formed between the ejection room or compression room and the back pressure chamber and/or between the back pressure chamber and the suction chamber. The back pressure control valve comprises a first valve room(74a) which is communicated with the ejection room or the compression room by a high pressure path, a second valve room(74b) which is communicated with the back pressure chamber by a back pressure path, a third valve room(74c) which is communicated with the suction chamber by a low pressure path, a first pressure receiving surface(S1) which is located within the first valve room, a second pressure receiving surface(S2) which is located within the second valve room, and a third pressure receiving surface(S3) which is located within the third valve room. The pressure receiving area of the third pressure receiving surface is larger than the pressure receiving area of the first pressure receiving surface and the pressure receiving area of the second pressure receiving surface.
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