Electronic expansion valve and its spool

Abstract

The invention discloses an electronic expansion valve and its valve core. The valve core includes a driving connection part and a flow regulating part fixed under the driving connecting part. The flow regulating part is in an inverted circular frustum structure as a whole; The lower end of the flow regulating part is provided with at least one diversion groove in the circumferential direction, which runs through the bottom end surface of the flow regulating part. The lower end of the valve core is provided with at least one diversion groove that runs through the bottom end surface of the flow adjustment part along the circumference. In this way, when the opening of the valve core reaches a certain level, the design of the diversion groove reduces the flow adjustment. The area of ​​the vortex area at the bottom increases the effective flow area of ​​the refrigerant and reduces the impact on flow regulation; in addition, due to the reduction of the area of ​​the eddy area, the generation of cavitation at the eddy area is correspondingly reduced, which can effectively reduce fluid noise.

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.

Images