Isolated electromagnetic proportional balancing valve suitable for multi-pressure working conditions

Abstract

The invention relates to an isolated electromagnetic proportional balancing valve suitable for multi-pressure working conditions. The isolated electromagnetic proportional balancing valve comprises amagnetic circuit balancing device and a pressure balancing device. The magnetic circuit balancing device comprises an outer magnetizer, a wire package, a magnetic isolating ring, a static iron core, amain spring, a magnetic conducting cover, a proportional magnetic ring, an armature, a positioning spring and a pressing ring. The pressure balancing device comprises a valve body, a valve stem, a valve core, a guide ring, a bottom cover, a large sealing ring, middle sealing rings and small sealing rings. According to the valve, the large flux leakage magnetic circuit and proportional magnetic ring design is adopted, the electromagnetic force of the electromagnetic valve can increase almost linearly, the balance of the electromagnetic force and the spring force is realized, and the balance and stability of stress of the armature are ensured; and meanwhile the balance pressure design is adopted for a liquid path so that medium static pressure and medium dynamic pressure can be cancelled out, the stress state of the armature has no connection with the pressure, the working pressure range can be enlarged, and the isolated electromagnetic proportional balancing valve is suitable for special working conditions of the pressure changes and fluctuations.

Description

technical field [0001] The invention relates to an isolated electromagnetic proportional balance valve suitable for multi-pressure working conditions, which is suitable for a precise adjustment element of the flow of fluid systems such as automobiles, aerospace and medical equipment. Background technique [0002] In many fields such as automobiles, aerospace, medical equipment, etc., there are extremely high requirements for electromagnetic proportional valves, and the opening of the valve port can be changed according to the ratio of the control current loaded on the coil, so as to realize the automatic and precise adjustment of the flow rate. [0003] For the solenoid valve, as the stroke changes, the electromagnetic force changes in a quadratic relationship, while the change of the spring force with the formation is generally linear, so the electromagnetic force changes faster than the spring force, so it is difficult to use Electromagnetic force and spring force are bala...

AI Technical Summary

Problems solved by technology

There are high requirements for machining accuracy, and it is difficult to maintain consistency in production; (2) Friction structure

Since the spool needs to leak magnetic flux through the wall during its movement, the distance between the spool and the wall is small. Although the spool is suspended by the leaf spring, there is still a risk of friction, which is easily affected by the environment and causes friction, which will affect the product. Proportional performance

[0005] In addition, the traditional electromagnetic proportional valve is not only affected by friction, but the greater interference factor comes from the pressure of the medium, and with the increase of the valve diameter, the increase of the medium pressure and the pressure fluctuation during use, its influence more serious

When the valve is in the closed state, the spool or armature of the valve will be affected by the pressure difference, and the electromagnetic force is greater than the pressure difference force and the spring force to open the valve, but once the valve is opened, the pressure difference force will decrease rapidly, making the valve core The force balance is difficult to maintain

In addition, the dynamic pressure of the medium during the flow process will also disturb the force state of the valve core, making it difficult for the valve core to stabilize at a specific opening position

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