Electronic expansion valve and its seat assembly, seat core

Abstract

The invention discloses an electronic expansion valve, its valve seat assembly, and a valve seat core. A flow port is opened on the peripheral wall of the valve seat core. The flow port includes a large flow port section and a small flow port section. The large flow port The section is close to the top of the valve seat core, the small flow port section is close to the bottom end of the valve seat core, and the large flow port section and the small flow port section are staggered in the circumferential direction of the valve seat core set up. The structure of the valve seat core prevents the refrigerant and impurities from rushing into the valve port when the opening is small, avoids the accumulation of impurities in the sealing part of the valve port, keeps the sealing part of the valve port clean, and ensures the sealing when the valve port is closed. sex.

Description

technical field [0001] The invention relates to the technical field of fluid control components, in particular to an electronic expansion valve, a valve seat assembly and a valve seat core thereof. Background technique [0002] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a typical electronic expansion valve. [0003] Generally, the electronic expansion valve includes a casing 10 , a motor 20 , a gear assembly 30 , a valve stem assembly 40 and a valve seat assembly 50 . [0004] The motor 20 is built in the casing 10, and the output shaft of the motor 20 is connected to the screw rod 60 through the gear assembly 30 supported on the gear seat. The screw rod 60 is connected with a nut 70 through threaded fit, and the nut 70 is connected to the valve stem assembly 40, wherein, The circumferential direction of the nut 70 is limited. [0005] please combine figure 2 , figure 2 It is a structural schematic diagram of a valve seat assembly of ...

AI Technical Summary

Problems solved by technology

[0012] When the electronic expansion valve is used in a system with a lot of impurities, the valve stem assembly 40 is lifted away from the valve port 51a, and when the opening is small, the refrigerant and impurities rush in from the inlet connection pipe 53 through the flow port 52a, among which the larger particles Impurities will be deposited on the sealing part of the valve port 51a. When the valve stem assembly 40 closes the valve port 51a, the previously deposited impurities will cause wear to the sealing parts of the two, which will easily cause leakage and affect the performance of the electronic expansion valve.

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