Large-diameter electronic expansion valve applying double-valve-needle structure

Abstract

The utility model relates to a large-caliber electronic expansion valve applying a double-valve needle structure, which comprises a stator assembly and a valve seat assembly, the valve seat assembly comprises a valve seat component, a non-magnetic tube arranged at the upper end of the valve seat component and a magnetic rotor component arranged in the non-magnetic tube, and an outer valve needle and a valve needle spring are arranged in the valve seat component. A valve port is formed in the bottom of the valve seat assembly, one end of the outer valve needle is inserted into the valve port, a first inner cavity is formed in the outer valve needle, a valve port cover is installed at the lower end of the outer valve needle, a hole is formed in the bottom of the valve port cover, a side hole communicated with the hole is formed in the outer side wall of the valve port cover, a nut is slidably installed in the first inner cavity, and an inner valve element is installed at the lower end of the nut. A second inner cavity is formed in the lower portion of the inner valve element, an inner valve needle and a compression spring are installed in the second inner cavity, and the lower end of the magnetic rotor assembly is axially connected with the nut. When the opening degree is small and large, high-precision adjustment can be achieved, the energy-saving effect is obvious, installation is convenient, and the pressure balancing function is achieved.

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