Coolant injection device and control method of rotary compressor

Abstract

The invention discloses a refrigerant charging device of a rotary compressor, which includes a motor arranged in a sealed shell and a compressor pump body connected with the motor, wherein, the compressor pump body includes a cylinder, a main bearing and a supplementary bearing which are respectively arranged at the upper part and the lower part of the cylinder, a crankshaft connected with the motor, a cylinder compression chamber containing a piston which can rotate freely, a slip sheet the front end of which is pressed and connected to the excircle of the piston, and a slip sheet groove for holding the slip sheet; the cylinder, the main bearing or the supplementary bearing of the compressor pump body are provided with the refrigerant charging device, the device is at least provided with a charging hole which is opened on the cylinder compression chamber and a switching valve which responds to the pressure change of the cylinder compression chamber, and the entrance of the refrigerant charging device is connected with the upper space of the shell and / or the exit of an indoor heat exchanger so as to charge gas and / or liquid refrigerant to the cylinder compression chamber. By charging the refrigerant to the cylinder compression chamber, the invention designs the switching valve which automatically controls the charging rate of the refrigerant according to the pressure change of the cylinder compression chamber, with simple and reasonable structure, reliability and cost advantage.

Description

technical field [0001] The invention relates to a rotary compressor, in particular to a refrigerant charging device for a rotary compressor and a control method thereof. Background technique [0002] In order to prevent the rotary compressor mounted on the air conditioner from overheating, and to improve the heating capacity and efficiency, the technology of charging (injecting) refrigerant into the cylinder compression chamber of the compressor is applied. This filling method generally adopts the following method: the refrigerant filling hole arranged on the main bearing or the auxiliary bearing uses the upper or lower moving surface of the piston to achieve the purpose of opening and closing with the rotation of the piston. Therefore, the start and stop of filling depends on the angle of rotation of the piston. In principle, the charging hole cannot communicate with the inner diameter side of the piston during operation, so the diameter of the charging hole is generally l...

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Problems solved by technology

Moreover, with the rotation of the piston, the charging hole is continuously opened and closed, so the effective hole area is about 1 / 2 of the above-mentioned diameter, so this charging method cannot correspond to a system filled with a large amount of refrigerant

Moreover, the opening and closing of the filling hole depends on the rotation angle of the piston, so there is a disadvantage that the timing of the opening and closing is always fixed.

Therefore, there will be a problem that the efficiency of the compressor and the system will be reduced in the combined heating and cooling air conditioner with large changes in the cylinder compression chamber.

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