Electronic expansion valve

Abstract

The invention provides an electronic expansion valve comprising a valve body having a valve port and a valve needle matched with the valve prot to adjust flows for the electronic expansion valve. The electronic expansion valve is characterized in that the valve port orderly comprises a first conical surface part, a straight section part and a second conical surface part, wherein the height of the first conical surface part and the height of the straight section part are in a relationship of =<d1/d2=<10; d1 represents the height of the first conical surface part; and d2 represents the height of the second conical surface part. When the valve needle leaves the valve port to a position with at least 250 pulse, a flow path with an annular cross section is formed between the first conical surface of the valve needle and the first conical surface part of the valve port; the annular ring area is gradually increased from the valve port to the inner cavity of the valve seat, so circulation area from the valve port to the inner cavity of the valve seat is smoothly changed; and when fluid flows through the valve port, jumping changes of the circulation area can be avoided, so bubbles can be prevented and noise can be reduced.

Description

technical field [0001] The invention relates to the technical field of fluid control components, in particular to an electronic expansion valve. Background technique [0002] In the technical field of refrigeration and heating, the electronic expansion valve is the refrigerant flow control part of the refrigeration and heating equipment. Refrigerant flow. [0003] However, affected by the design of the internal flow passage of the electronic expansion valve, the fluid will generate noise when passing through the valve port. Therefore, for some medium and high-end models, the flow passage of the expansion valve needs to be specially designed. [0004] Please refer to figure 1 , figure 1 It is a schematic structural diagram of a typical electronic expansion valve in the prior art. [0005] The electronic expansion valve includes a valve seat 16, on which a first connecting pipe 14 and a second connecting pipe 15 are respectively fixedly connected. Connecting pipe 15 (flui...

AI Technical Summary

Problems solved by technology

[0008] like figure 2 As shown, the lower end of the valve port 17' is provided with a bell mouth 171', although the bell mouth 171' can reduce noise to a certain extent, but when the fluid flows from the first connecting pipe 14 through the valve port 17' to the second connecting pipe 15 During the process, since the diameter of the inner hole of the valve port 17' is much smaller than the diameter of the inner hole of the first connecting pipe 14, when the fluid passes through the valve port 17', the flow area will still change abruptly, so that the fluid is easy to pass through the valve port. Bubbles are generated, and the bubbles are squeezed and broken through the valve port, resulting in noise

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