A proportional flow valve

Abstract

The invention discloses a proportional flow valve, which includes a valve housing assembly, an electromagnet assembly, a valve core assembly, a sealing ring structure and a pretightening force structure. There is an air intake passage extending up and down inside the air seat. The electromagnet assembly is used to provide upward magnetic attraction. The valve core assembly has an upward movable stroke driven by the magnetic attraction force. The inlet of the air channel is formed at the lower end of the valve core assembly and communicates with the air intake passage, the outlet is formed at the side end of the valve core assembly, and the sealing ring structure includes a sealing ring in which the inner ring is sleeved on the valve core assembly and the outer ring is fixed in the installation cavity. Ring, the pre-tightening force structure is set between the valve core assembly and the inner wall of the installation cavity to provide a downward pre-tightening force for the valve core assembly. It works stably under different working conditions, and solves the influence of high back pressure on the proportional flow valve.

Description

technical field [0001] The invention relates to the technical field of gas flow control and valves, in particular to a proportional flow valve. Background technique [0002] In the proportional flow valve, the flow output value has a linear relationship with the valve core opening, and the valve core opening has a linear relationship with the input electrical signal through an intermediate conversion mechanism, thus determining the linear relationship between the flow output value and the input signal. [0003] Ordinary solenoid valves use an electromagnetic coil and a linear spring structure, and are usually used as an on-off valve, that is, after the electromagnetic coil is energized, it overcomes the spring force to open the valve core, because the electromagnetic force generated by the electromagnetic coil has an exponential relationship with the air gap, while the linear spring and the compression amount Or the stretching amount has a linear relationship. Under the same...

AI Technical Summary

Problems solved by technology

However, it is difficult to meet the requirement that the proportional flow valve is stable at a certain position during the opening process of the valve port, so the linear relationship between the flow output value and the input signal cannot be realized, and the proportional adjustment of the flow rate cannot be realized.

[0004] In some working conditions, such as a transfer ventilator, the venturi nozzle is usually used to introduce air after the proportional valve, but the gas passing through the proportional valve will generate a large back pressure when passing through the venturi nozzle. It cannot work normally under high pressure conditions, and the proportional adjustment of flow rate cannot be realized.

[0005] So far, there is no proportional flow valve on the market that can solve the above problems

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