Refrigerant filling type rotary compressor

Abstract

The invention discloses a refrigerant filling type rotary compressor comprising a casing, a compression mechanism, an injection tube and an injection valve. The compression mechanism includes a cylinder, a main bearing, a vice bearing, a crankshaft, a piston and a slip sheet, the inner wall of a cylinder cavity of the cylinder is provided with a filling opening, and a filling channel with a filling hole is arranged on the cylinder. The injection valve is in a close state to isolate the filling hole and the filling opening when the pressure in the cylinder cavity is greater than the pressure in the filling hole, and the injection valve is in an open state to connect the filling hole and the filling opening when the pressure in the cylinder cavity is less than the pressure in the filling hole. When the injection valve is in the close state, a clearance which is between the injection valve and the filling opening and capable of entering a compressed gas is called the clearance volume formed by injection valve, the ratio range of the clearance volume formed by injection valve to cylinder suction volume is 0.3-1.5%. The refrigerant filling type rotary compressor can reduce the performance loss of the refrigerant filling type rotary compressor.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a refrigerant-filled rotary compressor. Background technique [0002] Generally, the working process of the refrigerant-filled rotary compressor is that when the compressor suction ends, the pressure in the compression chamber of the compressor is lower than the pressure of the refrigerant injection port, and the injection valve opens one-way to compress the injection gas in the chamber. With the movement of the piston, the volume of the compression chamber gradually decreases, and the gas pressure gradually increases. When the pressure in the compression chamber is equal to the pressure of the refrigerant injection port, the injection valve is closed. With the further movement of the piston, the volume of the compression chamber is further reduced. When the gas pressure in it is slightly higher than the exhaust pressure, the compressor exhaust valve opens and the compressor starts to ...

AI Technical Summary

Problems solved by technology

[0003] However, the common refrigerant-filled rotary compressor has the following defects: due to the existence of the injection valve and the charging port, the high-pressure gas charged in the gap of the injection valve and the charging port will not be further compressed when the piston moves to the charging port. compression discharge

It will become the extra clearance volume of the compressor, which is called the clearance volume formed by the injection valve, which affects the performance of the compressor

At the same time, when the piston moves to the filling port, the compressed and undischarged gas in the compression chamber may also leak to the suction chamber

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