Electronic expansion valve

Abstract

The invention discloses an electronic expansion valve used for a variable-frequency air conditioner. The electronic expansion valve comprises a motor (1) and a speed reducer (2), wherein the speed reducer (2) is connected with an output end of the motor (1), a gearbox (9) is sleeved outside the speed reducer (2), a motor casing (6) of the motor (1) is riveted to the outer side of the gearbox (9), a corrugated pipe (11) is sleeved outside a valve rod (15) of the electronic valve and extends or retracts along reciprocation of the valve rod (15). The electronic expansion valve further comprises a pressure release part (17) for discharging high-pressure refrigerant in the electronic expansion valve when the corrugated pipe (11) fractures, and the pressure release part (17) is arranged on the gearbox (9) or the motor casing (6). By the above structure, when the corrugated pipe fractures, the high-pressure refrigerant flows into the upper portion of a coil and can be discharged out of the electronic expansion valve through the pressure release part, so that discharging of the high-pressure refrigerant is realized, and the motor casing is protected.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to an electronic expansion valve used for frequency conversion air conditioners. Background technique [0002] Electronic expansion valves are mainly used in frequency conversion air conditioning systems. They drive the motor to rotate through high pulse frequency current, directly drive the reducer, and through the transmission of the threaded pair and the valve stem, the valve needle rises or falls, changing the opening degree of the valve port, thereby automatically Adjust the flow of refrigerant to keep the refrigerant circuit system in the best condition all the time. [0003] Please refer to figure 1 , figure 1 It is a structural schematic diagram of an electronic expansion valve in the prior art. The defects existing in the working process of this electronic expansion valve will be described in detail below with reference to the accompanying drawings. [0...

AI Technical Summary

Problems solved by technology

When the pipe fittings are not properly protected during welding, resulting in leakage of the welded part of the bellows 11', or improper use during use (the maximum operating pressure exceeds the allowable range), causing the bellows 11' to fail and rupture, a large amount of high-pressure refrigerant will be released. Quickly flow into the upper part of the coil through the leakage part

Although there is a shell 6' riveted on the top of the coil, the main function of this shell 6' is to prevent external moisture from entering the coil, and it cannot prevent the high-pressure refrigerant entering the shell 6' from leaking out. It will cause the riveted part of the shell 6 to be forcibly pulled off, and the unconstrained shell 6' will be rushed away like a bullet that has been unloaded

Since the shell 6' is a metal part, this will produce a certain lethality, threatening the safety of other parts and even personal safety in the system

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