An electronic expansion valve

Abstract

The invention discloses an electronic expansion valve, comprising a valve port seat, a guide sleeve and a valve needle, the lower end of the guide sleeve is sleeved or connected with the upper end of the valve port seat or the guide sleeve and the valve port seat are One piece, the upper part of the valve needle has a large diameter part, the lower part of the valve needle has a small diameter part, the small diameter part of the valve needle is located in the guide sleeve and can reciprocate axially in the guide sleeve The small-diameter portion is slidably sleeved with a collar for blocking air flow, and the outer sidewall of the collar is fixedly connected with the inner sidewall of the guide sleeve or the collar is integrated with the guide sleeve. The electronic expansion valve of the present invention can effectively prevent the airflow from directly impacting the valve needle. When the airflow momentum is large, most of the airflow will be blocked by the lower end surface of the collar, and only a very small part of the airflow will be received at the head of the valve needle. The impact will not cause large vibrations to the valve needle, so the noise caused by the vibration of the valve needle can be reduced, and even the noise can be eliminated.

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] The electronic expansion valve is an important part in the refrigeration system, which mainly plays the role of throttling and reducing pressure and regulating flow. The existing electronic expansion valve includes a valve body, a nut, and a valve needle assembly threadedly engaged with the nut. A driving device is used to drive the valve needle assembly to rotate while generating axial movement to adjust the opening of the valve port to achieve flow control. [0003] The invention patent with the publication number CN102454818A and the name "An Electric Valve" discloses an electronic expansion valve with the following structure: valve seat, valve core seat, valve needle screw assembly, nut, wherein the valve needle screw assembly is installed on th...

AI Technical Summary

Problems solved by technology

However, when the refrigerant is running unstable, the electronic expansion valve will produce noise

Since the noise is only generated when the electronic expansion valve is working, and the noise does not exist all the time, the reason for the noise cannot be found for a long period of time, and the electronic expansion valve cannot be further improved to eliminate or reduce the noise.

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