Control valve of variable displacement compressor

Abstract

The invention provides a control valve of a variable displacement compressor. The control valve of the variable displacement compressor comprises a drive part and a valve part, wherein the drive partcomprises a shell, a control unit, a Hall element, a moving core, a magnet, a first spring, a static core, a memory alloy drive piece and a heating element, and the valve part comprises a valve body,a valve core assembly and a connecting rod. The control valve provided by the invention drives the valve core assembly to move by using the characteristics of heating and elongation of a memory alloymaterial, realizes automatic closed-loop control of an opening degree of the control valve, and has high control accuracy; an electromagnetic drive mode is cancelled, the shell, the valve body, the valve core and other components can adopt light aluminum materials or common carbon steel materials, so the manufacturing cost is low, and the miniaturization of the control valve is convenient to realize; the impact of the valve core assembly on the valve body is reduced, and the control valve helps to extend the service life of the control valve; a corrugated pipe pressure sensing component is notneeded to be used, so additional equipment investment is avoided; and the problem of reduced performance of the control valve caused by the elastic attenuation of the corrugated pipe after use is avoided.

Description

technical field [0001] The invention relates to the field of compressor control valves, in particular to a control valve for variable displacement compressors. Background technique [0002] Automobile air-conditioning compressor is the heart of automobile air-conditioning refrigeration system, which plays the role of compressing and transporting refrigerant vapor. According to different working principles, air conditioner compressors can be divided into fixed displacement compressors and variable displacement compressors. Many of the current automobile air-conditioning systems use variable displacement compressors. When the air-conditioning system is working, changing the displacement of the compressor can change the cooling capacity, which is convenient for adjustment and can save energy consumption. [0003] The control valve is an important part of the variable displacement compressor, which can steplessly adjust the power of the compressor and change the displacement of...

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Problems solved by technology

[0004] 1. The electromagnetically driven control valve has high requirements on the materials of the shell, valve body and valve core during production. The shell needs to be made of pure iron with good magnetic conductivity and strict carbon content requirements, and the valve body needs to be made of copper. High-quality materials, the valve core needs to be made of stainless steel, and the manufacturing cost is relatively high;

[0005] 2. The volume of the control valve is large, and it is inconvenient to install and use; the impact of the valve core on the valve port is relatively large during use, and the service life of the control valve is short, which increases the replacement cost;

[0006] 3. The manufacturing cost of the bellows pressure sensing element is high, which increases additional equipment investment; the bellows pressure sensing element has the problem of elastic attenuation after a period of use, which will easily cause the performance of the control valve to decline and lead to the failure of the air conditioning system

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