Scroll compressor

Abstract

A scroll compressor according to the present invention includes a casing, an orbiting member provided within the casing and performing an orbiting motion, a non-orbiting member forming a compression chamber together with the orbiting member, the compression chamber having a suction chamber, an intermediate pressure chamber and a discharge chamber, a communication passage configured to bypass a refrigerant of the compression chamber into the casing, an opening / closing valve assembly configured to open and close the communication passage, and a switching valve assembly configured to operate the opening / closing valve assembly, the switching valve assembly being provided outside the casing and connected to the opening / closing valve assembly, whereby an installation of the bypass hole can result in prevention of over-compression and an installation of a control valve for varying a capacity outside the casing can result in reduction of costs for the control valve.

Description

technical field [0001] The present invention relates to a scroll compressor, in particular to a capacity variable device of the scroll compressor. Background technique [0002] A scroll compressor is a compressor in which a non-orbiting scroll is provided in the inner space of a casing, and the orbiting scroll engages with the non-orbiting scroll to perform an orbiting motion, so that the non-orbiting scroll Two pairs of compression chambers consisting of a suction chamber, an intermediate pressure chamber, and a discharge chamber are formed between the non-orbiting scroll portion and the orbiting wrap portion of the orbiting scroll. [0003] The scroll compressor can obtain a relatively higher compression ratio than other types of compressors, so that the suction, compression, and discharge strokes of the refrigerant are gently connected, so that a stable torque (toque) can be obtained. The scroll compressor has such a Advantages, often used to compress refrigerants in air...

AI Technical Summary

Problems solved by technology

[0019] However, the capacity variable device of the conventional scroll compressor as described above is composed of the adjustment ring 61, the lifting ring 62, and the control valve 63, and the number of parts is large, so that the adjustment ring 61 needs to be formed on the adjustment ring 61 in order to operate the adjustment ring 61. The first communication path 61a, the second communication path 61b, and the third communication path 61c have a problem that the structure of the adjustment ring 61 becomes complicated.

[0020] In addition, the capacity variable device of the conventional scroll compressor needs to use the refrigerant in the back pressure chamber 60a to quickly float the adjustment ring 61. However, since the adjustment ring 61 is formed in an annular shape and the control valve 63 is combined, the adjustment ring The added weight of the 61 makes it difficult to float the adjustment ring up quickly

In addition, the flow path for floating the adjustment ring 61 is long, and the refrigerant needs to flow into the space between the adjustment ring 61 and the lifting ring 62 to float the adjustment ring 61, but there is still a back pressure chamber on the upper surface of the adjustment ring 61 60a pressure, so it is not easy to make the adjustment ring 61 float, so that the responsiveness of the valve is correspondingly reduced, and the capacity change of the compressor cannot be controlled quickly

[0021] In addition, the capacity variable device of the conventional scroll compressor cannot be equipped with a bypass hole and a check valve for opening and closing the bypass hole structurally. When overcompression occurs in the corresponding operation mode, it cannot be properly adjusted. countermeasures, thereby reducing the efficiency of the compressor

[0022] In addition, in conventional capacity variable devices of scroll compressors, the control valve 63 is arranged inside the casing 110, and the size of the control valve 63 needs to be determined in consideration of the internal space of the casing, so the design freedom of the control valve 63 corresponds to In addition, a small control valve 63 is used in a limited space, so standardized and low-cost components cannot be used, and there is also a problem of increased manufacturing costs.

[0023] In addition, conventional capacity variable devices for scroll compressors are additionally provided with separate terminals for supplying power to the control valve in addition to the terminals for supplying power to the drive motor. , that is, the number of parts increases to increase the assembly workload and increase the manufacturing cost

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