An electronic expansion valve

Abstract

The invention discloses an electronic expansion valve, belonging to the technical field of expansion valves, comprising a valve seat and a casing arranged on a valve body, the casing is fixed on the valve seat, and a first channel and a second channel are arranged on the valve body. The valve seat is provided with a flow channel and a valve port between the first channel and the second channel, and a valve needle and a rotor assembly for driving the valve needle to move back and forth are arranged in the casing, and a valve seat is provided with a matching valve needle. When the valve needle moves back and forth along the guide hole, it opens or closes the valve port. One side of the valve seat is provided with an upper valve chamber connected to the inside of the casing, and the other side is provided with a lower valve chamber connected with the second channel. , There is a communicating balance hole between the upper valve cavity and the lower valve cavity. The electronic expansion valve provided by the present invention is provided with a balance hole communicating with the upper valve cavity and the lower valve cavity. Through the function of the balance hole, the pressure in the upper valve cavity is consistent with the pressure in the lower valve cavity, and the pressure difference formed by the upper valve cavity and the first channel on the valve needle is the same as the pressure formed by the first channel and the lower valve cavity on the valve needle. The differential forces cancel each other out.

Description

technical field [0001] The invention relates to the technical field of expansion valves, in particular to an electronic expansion valve. Background technique [0002] As a flow regulating element, the electronic expansion valve adapts to the development requirements of refrigeration electromechanical integration and provides conditions for the intelligence of the refrigeration system. It is a promising self-control regulating element. The electronic expansion valve uses the principle of a stepping motor to drive the magnetic rotor part to rotate forward and reverse through the coil, and converts the rotation of the magnetic rotor part into the up and down movement of the push rod, and the push rod drives the valve needle connected to it to rise or fall Control the flow of refrigerant. [0003] The publication number is CN 106151554 A, and the publication date is that the Chinese invention patent application on November 23, 2016 discloses a kind of figure 1 In the electroni...

AI Technical Summary

Problems solved by technology

[0004] However, in order to achieve the purpose of reducing the pressure difference resistance of the valve needle, the above-mentioned existing electronic expansion valve needs to set up a balance chamber 107 and a bypass channel 109 on the seat body, which is difficult to process, difficult to manufacture, and requires high assembly accuracy. The overall balance structure more complex

In addition, because the valve needle 31 needs to go down deep into the balance chamber 107, the valve needle is slender, the processing of the valve needle is difficult, and the slender valve needle is easily deformed after being stressed, which affects the overall use effect of the electronic expansion valve.

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