Electronic expansion valve

Abstract

The invention discloses an electronic expansion valve. The electronic expansion valve comprises a valve opening base, a guiding sleeve and a valve needle. The lower end of the guiding sleeve is sleeved with the upper end of the valve opening base in a connected manner or the lower end of the guiding sleeve and the upper end of the valve opening base are integrally connected or the guiding sleeve and the valve opening base are an integrated piece. The upper portion of the valve needle is provided with a large-diameter part, and the lower portion of the valve needle is provided with a small-diameter part. The small-diameter part of the valve needle is located in the guiding sleeve and can do the reciprocating movement in the guiding sleeve in the axial direction. The small-diameter part is sleeved with a lantern ring in a sliding manner, and the lantern ring is used for stopping airflow. The outer side wall of the lantern ring and the inner side wall of the guiding sleeve are fixedly connected or the lantern ring and the guiding sleeve are an integrated piece. According to the electronic expansion valve, airflow can be effectively prevented from directly impacting on the valve needle, and when airflow impact force is very large, most of airflow is blocked by the lower end face of the lantern ring, only the head part of the valve needle can be subjected to an extremely small part of airflow impact, and the valve needle cannot be greatly vibrated; and thus, noise, formed through vibration, of the valve needle can be reduced, and even 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.

Images