Electronic expansion valve and valve core thereof

Abstract

The invention discloses an electronic expansion valve and a valve core thereof. The valve core comprises a driving connection part and a flow adjusting part fixedly arranged under the driving connection part; the overall flow adjusting part is of an inverted circular truncated cone structure; and the lower end of the flow adjusting part is provided with at least one flow guide groove in the circumferential direction, and the flow guide grooves penetrate through the bottom end surface of the flow adjusting part. According to the valve core, the lower end of the flow adjusting part of the valve core is provided with the at least one flow guide groove penetrating through the bottom end surface of the flow adjusting part in the circumferential direction, in this way, when the opening degree of the valve core reaches a certain degree, the area of an eddy current zone on the lower portion of the flow adjusting part is decreased through the design of the flow guide grooves, the effective circulation area of a refrigerant is increased, and the influence on flow adjusting is reduced; and in addition, as the area of the eddy current zone is decreased, cavitation at the eddy current position is reduced correspondingly, and the fluid noise can be effectively lowered.

Description

technical field [0001] The invention relates to the technical field of fluid control components, in particular to an electronic expansion valve and a valve core thereof. Background technique [0002] Generally, an electronic expansion valve includes a driving part, a gear assembly, a screw rod, a valve core and a valve seat assembly. [0003] The output shaft of the driving part is connected to the screw rod through the gear assembly, and the screw rod is threadedly connected to the valve core, wherein the circumferential direction of the valve core is limited. [0004] The valve seat of the valve seat assembly is provided with interfaces connected with two connecting pipes respectively. One of the two connecting pipes is a fluid inlet and the other is a fluid outlet. The valve seat also has a valve port, which controls the opening and closing of the valve port. On-off of two interfaces. [0005] A valve core seat is embedded in the valve seat, and a flow port connecting t...

AI Technical Summary

Problems solved by technology

[0009] When the spool is lifted slowly, the flow rate of the valve body increases gradually, and the flow rate of the refrigerant increases to a certain level, because the head of the spool, that is, the flow adjustment part is of blunt structure, it is easy to form many small vortices at the lower part of the flow adjustment part. , eventually forming turbulence or turbulence, which not only increases the noise, but also tends to cause the flow rate to remain unchanged or decrease, resulting in the failure of the function of regulating the flow rate

[0010] Therefore, how to improve the structure of the spool of the electronic expansion valve to avoid turbulent flow at the bottom of the spool when the flow rate increases, which affects the adjustment of the flow rate, is a technical problem that those skilled in the art need to solve at present.

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