Thermal expansion valve

Abstract

The invention discloses a thermal expansion valve, belongs to the technical field of vapor compression-type refrigerating, and is suitable for an automobile air conditioner system. The thermal expansion valve mainly comprises a thermal head 1, a valve body 2, a valve rod 3, a steel ball base assembly 4, an adjustment spring 5 and the like. The thermal expansion valve is characterized in that the steel ball base assembly 4 comprises a steel ball 41, a steel ball base 42 and a damping spring 43. When a driver suddenly starts the automobile air conditioning system, the steel ball 41, the steel ball base 42 and the damping spring 43 constituting the steel ball base assembly 4 have constitute a whole though the valve rod 3 and the steel ball base assembly 4 may disengage, and the damping spring 43 is in interference fit with a valve hole 21. By means of the inhibition function of the damping spring 43, the situation that the steel ball base assembly 4 and the adjustment spring 5 vibrate due to external excitation and disturbance is not prone to occurring, and accordingly the thermal expansion valve cannot sound abnormally.

Description

technical field [0001] The invention relates to a thermal expansion valve, which belongs to the technical field of vapor compression refrigeration and is suitable for various thermal expansion valves in automobile air-conditioning systems. Background technique [0002] As a key component in the automotive air-conditioning system, the thermal expansion valve plays the role of throttling and reducing pressure, regulating flow, and maintaining an appropriate degree of superheat. Its performance directly affects the performance of the air-conditioning system. [0003] The phenomenon of abnormal sound of thermal expansion valve is the first complaint of users in the international automotive air-conditioning industry in recent years. It usually occurs within one minute after the vehicle is started and the air conditioner is turned on. The duration is about 2 to 3 seconds. The reason is that When the driver suddenly turns on the car air conditioning system, if figure 1 As shown, t...

AI Technical Summary

Problems solved by technology

At present, the more common method in the industry is to increase the damping spring 5 to suppress the vibration of the steel ball seat assembly 4 and the adjustment spring 6. Since the steel ball seat assembly 4 and the damping spring 5 are in clearance fit, the vibration of the steel ball seat assembly 4 cannot be completely avoided. , increasing the damping spring 5 cannot fundamentally solve the abnormal sound of the thermal expansion valve

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