Double-cylinder variable-capacity compressor and control method

Abstract

The invention provides a double-cylinder variable-capacity compressor and a control method thereof. The double-cylinder variable-capacity compressor includes a shell, a motor and a cylinder assembly,wherein the motor and the cylinder assembly are arranged in the shell, the motor is connected with the cylinder assembly through a crankshaft, the cylinder assembly includes a variable-capacity chamber component, a sealing component and a gear oil pump, the sealing component is fixed between the variable-capacity chamber component and the gear oil pump, the crankshaft is provided with a cavity extending to the top of the crankshaft, and the sealing component is provided with a communication channel communicated with the variable-capacity chamber component, one end of the cavity is communicatedwith an upper cavity of the motor, and the other end of the cavity is communicated with an outlet of the communication channel. The compressor can be switched freely between a single-cylinder runningmode and a double-cylinder running mode according to the actual use environment of the compressor in an air conditioner, and it is guaranteed that high-pressure gas at the tail of a variable-capacitypart is in a gaseous state in the double-cylinder running mode. On one hand, the energy efficiency of double-cylinder running is improved, on the other hand, the stability of the compressor in switching between the single-cylinder running mode and the double-cylinder running mode is improved, and energy saving and high reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of air-conditioning compressors, in particular to a double-cylinder variable capacity compressor and a control method. Background technique [0002] At present, in order to meet the user's requirements for high efficiency, energy saving and comfort of air-conditioning products, our company uses variable capacity compressors to replace traditional variable frequency compressors. The structure of the double-cylinder variable capacity compressors is as follows: Figure 7 As shown, the variable capacity compressor has two operating modes: single cylinder and double cylinder. Cylinder operation mode to meet the needs of users with large cooling capacity. At present, our variable capacity compressor mainly uses pins to control the operation of single cylinder or double cylinder of the compressor. When the pin locks the sliding slide, the lower cylinder is idling, and the compressor realizes single cylinder Running...

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Problems solved by technology

[0002] At present, in order to meet the user's requirements for high efficiency, energy saving and comfort of air conditioning products, our company uses variable capacity compressors to replace traditional variable frequency compressors. The structure of the double cylinder variable capacity compressor is as follows: Figure 7 As shown, the variable capacity compressor has two operating modes: single-cylinder and double-cylinder. Cylinder operation mode to meet the needs of users with large cooling capacity. At present, our variable capacity compressor mainly uses pins to control the single-cylinder or double-cylinder operation of the compressor. When the pin locks the sliding slide, the lower cylinder is idle, and the compressor realizes single-cylinder Running, when the pin is retracted, the compressor operates in two cylinders, and the control of the pin is mainly controlled by the pressure on the head of the pin. The high pressure is introduced into the tail of the slider and the head of the pin through the exhaust port through the variable capacity component. The tail of the slider and the head of the pin belong to a relatively sealed environment. When the high-pressure refrigerant gas passes through the variable capacity component, the ambient temperature around the variable capacity component Low, after a long time of operation, the refrigerant in the variable capacity parts will change from gaseous state to liquid state, and the liquid refrigerant will have the following effects: First, it enters the compression chamber through the gap between the sliding vane and the sliding vane groove, resulting in a decrease in the performance of the compressor. When the compressor is switched from the double-cylinder operation mode to the single-cylinder operation mode, the liquid refrigerant in the variable capacity part needs to be vaporized before the pin can lock the sliding plate normally, resulting in unstable switching and even out-of-step control

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