Electronic expansion valve

Abstract

The embodiment of the invention provides an electronic expansion valve, which comprises an outer cover provided with a valve cavity, a valve seat provided with a valve seat cavity, a nut, a screw rod and a valve needle, wherein the outer cover is fixed on the valve seat; the upper end of the nut is positioned in the valve cavity and the lower end of the nut is fixed on the valve seat; the screw rod is inserted into the nut and is in transmission connection with an internal thread on the upper end part of the nut; the lower end of the valve needle is positioned in the valve seat cavity and the upper end of the valve needle is slidably arranged in a guide hole on the lower end part of the nut; the screw rod is connected with the valve needle and drives the valve needle to slide in the guide hole; at least one first through hole for communicating the valve cavity with the guide hole is formed on the nut; and at least one thread channel for communicating the valve seat cavity with the guide hole is formed on the inner surface of the guide hole or the side surface of the valve needle. The thread channel is formed to communicate the valve cavity with the valve seat cavity, so that the valve needle flexibly moves up and down; therefore, the reliability of the electronic expansion valve is improved.

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 working principle of the stepping motor to drive the magnetic rotor part to rotate by the coil, and converts the rotation of the magnetic rotor part into the up and down movement of the screw rod, and the screw rod drives the valve needle connected to it to rise or Decrease 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 and the like. Among them, the outer cover is correspondingly arranged on the valve seat, and the valve cavity and the valve seat cavity are respectively formed in the outer cover and the valve seat; the magnetic rotor is arranged in the valve cavity, and is connected with ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, when the high-speed flowing fluid enters the electronic expansion valve, the high-speed fluid directly enters the valve cavity through the through hole, and the impact force on the magnetic rotor in the valve cavity is relatively large, causing the magnetic rotor to vibrate violently, and the magnetic rotor is prone to phenomenon of rupture

Moreover, due to the compact design of the valve seat, the opening of the through hole will affect the layout of the parts in the electronic expansion valve, and it is difficult to open the through hole

Therefore, the reliability of the electronic expansion valve in the prior art is low

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