ELECTRONIC EXPANSION VALVE

摘要

A sleeve (4) is fixed in a main valve cavity (11) of an electronic expansion valve, and a valve core seat (2) of the electronic expansion valve is movably disposed in the sleeve (4) along an axial direction. A circumferential side wall of the sleeve (4) is provided with a sleeve runner (41). A circumferential side wall of the valve core seat (2) is provided with a valve core seat side hole (24). When refrigerants flow forward, the valve core seat (2) closes a main valve port (441) to break communication between the sleeve runner (41) and the valve core seat side hole (24), and the refrigerants flow to a valve port (21) at a valve core through the sleeve runner (41). When the refrigerants reversely flow, the valve core seat (2) moves up to open the main valve port (441) and enable the valve core seat side hole (24) to communicate with the sleeve runner (41). When the refrigerants flow forward, the structure design of the electronic expansion valve can avoid an excessively big impact of high-pressure refrigerants on the valve core seat (2) and prevent it from being eccentric.