Electronic expansion valve

Abstract

The embodiment of the invention provides an electronic expansion valve, comprising a magnetic rotor, a stop rod and a screw rod, wherein the axis of the screw rod is coincided with the axis of the magnetic rotor. The electronic expansion valve further comprises a connecting plate which is fixedly arranged in a through hole of the magnetic rotor, a first fixing hole is arranged at the center of the connecting plate, and the upper end part of the screw rod is fixedly arranged in the first fixing hole; a second fixing hole for fixing the stop rod is arranged on the connecting plate, and the lower end part of the stop rod is fixedly arranged in the second fixing hole; and the magnetic rotor drives the screw rod and the stop rod to rotate by the connecting plate. The stop rod, the screw rod and the magnetic rotor are firmly connected by the connecting plate which is fixedly arranged on the magnetic rotor, and the magnetic rotor is not influenced by the radial force of the connecting plate in the process that the stop rod and the screw rod are arranged on the magnetic rotor by the connecting plate, so as to reduce the possibility of cracking of the magnetic rotor owning to high radial force and improve the reliability of the electronic expansion valve.

Description

technical field [0001] Embodiments of the present invention relate to valve technology, in particular to an electronic expansion valve. Background technique [0002] The current electronic expansion valve uses the principle of a stepping motor to drive the magnetic rotor part to rotate forward and reverse with a coil, and convert the rotation of the magnetic rotor part into the up and down movement of the screw, and the screw drives the valve needle connected to it. Up or down to control the flow of the electronic expansion valve. [0003] The main structure of the electronic expansion valve in the prior art includes an outer cover, a valve seat, a nut, a valve needle, a screw rod, a magnetic rotor, a stop rod and the like. Wherein, the stop rod is injection-molded in a plastic assembly for installing the stop rod and the screw rod on the magnetic rotor. During the installation process of the electronic expansion valve, the screw rod is usually pressed into the installatio...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, since the magnetic rotor is a highly brittle material, after the plastic component is pressed into the magnetic rotor, the magnetic rotor bears an outward radial force, and the magnetic rotor is easily broken due to excessive radial force; the plastic component relies on the magnetic The pressure between the rotor through holes is fixed in the magnetic rotor, which is prone to loosening

Electronic expansion valves in the prior art are less reliable

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