ELECTRONIC EXPANSION VALVE WITH HIGH FLOW CONTROL PRECISION

摘要

An electronic expansion valve with precise flow control, comprising a valve seat (1) and a valve rod (3). A through groove (11) penetrating the top and bottom of the valve seat is formed on the valve seat (1); a bearing seat (2) matching the through groove is inserted in the through groove (11); the bearing seat (2) includes a seat body (23), a through hole (21) passing through the seat body is formed in the seat body (3); the through hole (21) matches the valve rod (3). An internal thread segment (24) is formed in the middle of the inner wall of the through hole (21). A matched straight tube is welded to the bottom of the through groove (11). The outer wall of the valve seat (1) is provided with a side hole communicated with the through groove (11), a matching elbow pipe (4) is welded to the side hole. An isolating sleeve (10) is welded to the outer wall of the valve seat (1). A magnetic rotor (6) is provided outside the upper end of the valve rod (3); a second circular groove (27) and a rectangular valve port (26) are formed on the outer wall of a lower end opening of the seat body (23). The electronic expansion valve can not only eliminate the lateral pressure generated by the valve rod under an air, but also improve the flow control precision, and therefore, the control and adjustment of a system are facilitated, and costs are reduced so as to meet market requirements.