Piston type differential-pressure-free opening electromagnetic valve

Abstract

The invention discloses a piston type differential-pressure-free opening electromagnetic valve which comprises a valve body, an air inlet pipe and an air outlet pipe are arranged in the valve body, a piston controls opening and closing of the air inlet pipe and the air outlet pipe, and a first branch pipe, a second branch pipe, a third branch pipe, a third air chamber, a first air chamber and a second air chamber are arranged in the valve body on the upper side and the lower side of the piston respectively; and a valve element structure for controlling opening and closing among the first branch pipe, the second branch pipe and the third branch pipe is arranged in the third air chamber. According to the piston type differential-pressure-free opening electromagnetic valve, opening and closing of the first branch pipe, the second branch pipe and the third branch pipe are controlled through the valve element structure, and when the electromagnetic valve is opened, the first air chamber, the second air chamber and the third air chamber communicate with one another, so that the technical performance of differential-pressure-free opening and closing is achieved.

Description

technical field [0001] The invention relates to a solenoid valve, in particular to a piston-type solenoid valve that opens without pressure difference. Background technique [0002] Solenoid valve is a very critical executive component for the automatic control of pipeline system, especially in the refrigeration system, the opening and closing of solenoid valve often requires the opening and closing of coil to control the pipeline to realize the opening and closing of solenoid valve. In the prior art, during the opening and closing process of the solenoid valve, there is a pressure difference between the air chambers that control the opening and closing of the inlet pipe and the outlet pipe. Especially during the opening process, the air chamber in the valve body cannot be emptied to cause a pressure difference, which leads to the piston It cannot be fully opened (the gravity of the piston is negligible), and there is a certain pressure loss, especially in some fields with h...

AI Technical Summary

Problems solved by technology

In the prior art, during the opening and closing process of the solenoid valve, there is a pressure difference between the air chambers that control the opening and closing of the inlet pipe and the outlet pipe. Especially during the opening process, the air chamber in the valve body cannot be emptied to cause a pressure difference, which leads to the piston It cannot be fully opened (the gravity of the piston is ignored), and there is a certain pressure loss, especially in some areas with high precision requirements, such pressure loss is not allowed.

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