Electronic expansion valve

By designing the position change of the transmission assembly in the electronic expansion valve, the second valve core is closed before the first valve core, and the problem of large valve closing force in the prior art is solved, and the valve closing force is reduced and efficiency is improved.

CN120426702APending Publication Date: 2025-08-05HANGZHOU SANHUA RES INST CO LTD
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Patent Information

Application Number
CN202410161891.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-02-05
Publication Date
2025-08-05

AI Technical Summary

Technical Problem

When the existing electronic expansion valve is closed, the valve closing force required for the second valve spool to close the second valve port is large, mainly because the pressure difference between the two sides of the second valve port is large after the first valve spool to close the first valve port.

Method used

An electronic expansion valve is designed, and the transmission assembly has a first position and a second position during movement. The second valve core is in contact with the second valve port at the first position, the first valve core is in contact with the first valve port at the second position, and the end of the transmission assembly is in contact with the first valve port at the first position away from the first valve port at the first position, ensuring that the second valve core closes the valve port before the first valve core and reduces the pressure difference.

Benefits of technology

By reducing the pressure difference between the two sides of the second valve opening, the valve closing force required for closing the second valve core is reduced, and the valve closing efficiency is improved.

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Abstract

The electronic expansion valve comprises a transmission assembly, a first valve element, a second valve element, a first valve port part and a second valve port part, the inner diameter of the second valve port part is larger than that of the first valve port part, and part of the transmission assembly has a first position and a second position in the process of moving towards the first valve port part. At the first position, the second valve element abuts against the second valve port part, and the first valve element is separated from the first valve port part; at the second position, the second valve element abuts against the second valve port part, and the first valve element abuts against the first valve port part; the end, connected with the first valve element, of the transmission assembly is farther away from the first valve port part at the first position than at the second position. In this way, the second valve element closes the second valve port part before the first valve element closes the first valve port part, the pressure difference between the two sides of the second valve port part is reduced, and then the valve closing force needed by the second valve element for closing the second valve port part is reduced.
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