Automobile air-conditioning heating power expansion valve

Abstract

An automobile air conditioning thermal expansion valve is provided, wherein, an upper part and a lower part of the valve body are respectively provided with an outlet I, an inlet II, an outlet III and an inlet IV; a push rod is arranged in the valve body, the bottom end of the push rod is supported on a valve ball which is arranged on a valve seat; the valve seat is arranged on a spring which is arranged in a groove of an adjusting bolt; the adjusting bolt is inserted from the bottom of the valve body; a top end of the push rod is connected with a seal cover through a memory alloy spring; a temperature sensing diaphragm is arranged between the memory alloy spring on the top end of the push rod and the top end of the push rod, the temperature sensing diaphragm and a temperature sensing diaphragm press ring are welded on a boss inside the valve body; an upper end of the push rod is provided with a boss with the diameter larger than that of the other parts of the push rod; or the memory alloy spring is covered on the push rod, the memory alloy spring is supported by the boss on the push rod; a seal bolt is cylindrically screwed into the top part of the valve body. The invention has the advantages of simple structure, reliable temperature sensibility and low cost; the memory alloy spring is used as temperature sensing medium, thereby solving the problem of leakage of the temperature sensing medium.

Description

technical field [0001] The invention relates to a flow control device of a refrigeration system, in particular to a thermal expansion valve applied to an automobile air-conditioning system. Background technique [0002] Since the automotive air-conditioning system has been operating under vibration and bumpy conditions for a long time, the thermal expansion valves used in the automotive air-conditioning system have high requirements on performance such as vibration resistance and reliability. Thermal expansion valves are divided into F-type and H-type according to their shapes. The F-type automotive air-conditioning thermal expansion valve is an external temperature-sensitive throttling control element. It is affected by the contact area, contact tightness and The impact of ambient temperature, and the connecting capillary of the temperature sensing package is easily broken; the temperature sensing conditions, vibration resistance, durability, and adjustment performance of t...

AI Technical Summary

Problems solved by technology

However, the present invention needs to prepare a special temperature-sensing agent filling device, and it does not completely avoid the possibility of leakage of the temperature-sensing agent in the bellows. The filling form, filling quality or pressure of the agent

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