Piston valve, variable capacity scroll compressor and air conditioner

Abstract

The present invention provides a piston valve, which is used in a compression assembly and comprises a piston main body, a piston projection part and a first elastic member, wherein the piston main body is provided with a first cavity, the piston projection part is embedded in the first cavity, can move up and down relative to the piston main body, and is provided with a second cavity, the first elastic member is arranged between the piston main body and the piston projection part, and the piston projection part is further provided with a pressure equalizing hole penetrating through the bottom portion of the second cavity. The present invention provides a variable capacity scroll compressor and an air conditioner. According to the present invention, the piston valve has the axial flexibility, such that the machining precision requirement on the part is reduced, and the sealing effect of the piston valve is ensured so as to improve the reliability of the compressor and increase the capacity changing efficiency; and by arranging the pressure equalizing hole, the difference between the upper pressure and the lower pressure of the piston projection part is reduced, and the sealing performance of the piston valve is improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a piston valve, a variable capacity scroll compressor and an air conditioner. Background technique [0002] Scroll compressors are widely used in the fields of refrigeration, air conditioning and heat pumps because of their advantages of high efficiency, small size, light weight and stable operation. Generally speaking, a scroll compressor is composed of a closed casing, a fixed scroll, a movable scroll, a bracket, a crankshaft, an anti-rotation mechanism, and a motor. The profiles of the movable scroll and the fixed scroll are both spiral , and the movable scroll is installed eccentrically with respect to the fixed scroll with a difference of 180 degrees, so multiple crescent-shaped spaces are formed between the movable scroll and the fixed scroll. When the movable scroll takes the center of the static scroll as the center of rotation and performs non-rotation-translation...

AI Technical Summary

Problems solved by technology

This structure is not easy to process and requires high machining accuracy of the parts. In addition, if there are burrs or impurities in the gap between the lower end surface of the piston protrusion and the tooth top of the movable scroll, the sealing performance of the piston valve will be poor, and the reliability of the compressor will be affected. reduce

Secondly, the leakage channel remains unchanged after the piston valve is opened, which cannot meet the requirement of large-flow refrigerant outflow and reduce the capacity-changing efficiency

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