Electromagnetic valve

Abstract

The invention provides an electromagnetic valve. The electromagnetic valve comprises a valve body part and a piston part, the piston part is movably arranged in an accommodating cavity, the piston part is provided with a closing position and an opening position, and when the piston part is located at the closing position, the piston part blocks an outlet; under the condition that the piston part is located at the opening position, the piston part avoids the outlet and an inlet; the piston part comprises an outer piston and an inner piston structure arranged in a cavity of the outer piston, the outer wall of the outer piston is matched with the inner wall of the accommodating cavity, the inner piston structure is provided with an inner balance hole and a first annular groove formed around the outer wall of the inner piston structure, and the outer piston is provided with an outer balance hole; and the inner balance hole, the first annular groove and the outer balance hole form a balance channel, an opening of the inner balance hole is a first opening, and an opening of the outer balance hole is a second opening. According to the scheme of the electromagnetic valve, the balance channel can be conveniently formed, the piston part can be made to be small in size and compact in structure, and therefore the size of the electromagnetic valve can be reduced.

Description

[0001] This application is a divisional application of the following application: the application date is January 3, 2020, the application number is 202010006882.8, and the name of the invention is solenoid valve. technical field [0002] The present invention relates to the technical field of solenoid valves, in particular to a solenoid valve. Background technique [0003] The piston part of the solenoid valve is used to block the outlet of the solenoid valve, and the piston part is provided with a penetrating balance channel. For the case of small pressure difference, the on-off valve is relatively stable. The flow capacity of the balance channel of the solenoid valve and the pilot valve port is related to the pressure. The balance channel is on the high pressure side, and the pilot valve port is on the low pressure side. When the pressure difference is high, the valve is opened. It is a gaseous environment, the gas is compressed, and the density increases. Under the same ...

AI Technical Summary

Problems solved by technology

The flow capacity of the balance channel of the solenoid valve and the pilot valve port is related to the pressure. The balance channel is on the high pressure side, and the pilot valve port is on the low pressure side. When the pressure difference is high, the valve is opened. It is a gaseous environment, the gas is compressed, and the density increases. Under the same pressure difference, the flow capacity of the high-pressure environment is greater than that of the low-pressure environment, so the flow capacity is relatively high. In this way, the flow capacity around the piston parts has a relatively enlarged tendency, and the pilot valve port The flow capacity tends to decrease relatively, which will cause the pressure in the upper chamber of the piston part to be too high, and the piston part cannot be opened.

[0004] Existing piston parts are usually of one-piece structure, and the balance channel runs through the interior, but if the size of the piston part is small, the balance channel is not easy to process, which is not conducive to the compact structure and volume reduction of the solenoid valve

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