Electronic expansion valve

Abstract

The invention provides an electronic expansion valve. The electronic expansion valve comprises a first valve seat, a second valve seat, a valve needle, a return spring, a driving mechanism and a sleeve, wherein the second valve seat is assembled on the first valve seat and provided with a main valve port; the valve needle slides to get close to or away from the main valve port and comprises a T-shaped end and a valve head end; the valve needle is sleeved with the return spring, and the return spring elastically keeps the main valve port normally opened; the driving mechanism comprises a nut and a screw, the screw is in threaded connection with the interior of the nut in the form of reciprocating in the sliding direction of the valve needle, and the screw abuts against the T-shaped end and drives the valve needle to open or close the main valve port; the return spring is sleeved with the sleeve, and the sleeve and the T-shaped end are matched so as to guide the valve needle to slide in the sleeve. The T-shaped end of the valve needle abuts against the driving mechanism, the sleeve and the T-shaped end are matched to form a sliding guiding relation, and thus the requirement for the concentricity of the valve needle and the screw is lowered, the phenomenon that the valve needle gets stuck in the working process is effectively avoided, the structure of the electronic expansion valve is simplified, and working difficulty is lowered.

Description

technical field [0001] The invention relates to an electronic expansion valve, in particular to an electronic expansion valve used in refrigeration systems such as air conditioners and refrigerators. Background technique [0002] In the air-conditioning market, due to the long distance between the indoor unit and the outdoor unit, two electronic expansion valves are generally used, and the two electronic expansion valves must be connected in parallel with check valves, so as to maximize the working efficiency of the air-conditioning system . [0003] In the electronic expansion valve of the prior art, the nut of the nut assembly is fixed in the guide sleeve, the guide sleeve is fixed on the valve seat, and the valve needle needs to be fixed in the valve port of the valve seat. The requirements are high, and the coaxiality between the valve core seat and the nut needs to be indirectly controlled through multiple assembly processes, and the coaxiality between the valve seat a...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an electronic expansion valve, which can overcome the difficulty in ensuring the coaxiality of the screw rod and the valve needle in the prior art, simplifies the structure of the electronic expansion valve, reduces the processing difficulty of the electronic expansion valve, and saves processing cost

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