Proportional flow valve

Abstract

The invention discloses a proportional flow valve. The valve comprises a valve shell assembly, an electromagnet assembly, a valve element assembly, a sealing ring structure and a pre-tightening forcestructure. A mounting cavity is formed in the valve shell assembly, an air inlet base is formed at the open end of the mounting cavity, an air inlet channel extending in the vertical direction is formed in the air inlet base, and the electromagnet assembly is used for providing upward magnetic attraction force. The valve element assembly has an upward moving stroke under driving of magnetic attraction force, an air guide channel is formed in the valve element assembly, an inlet of the air guide channel is formed in the lower end of the valve element assembly and communicates with the air inletchannel, and an outlet of the air guide channel is formed in the side end of the valve element assembly. The sealing ring structure comprises a sealing ring, wherein an inner ring of the sealing ringis sleeved with the valve element assembly, the pre-tightening force structure is arranged between the valve element assembly and the inner wall of the mounting cavity so as to provide downward pre-tightening force for the valve element assembly, and a valve element is stabilized at all working positions through balance between multiple forces. Therefore, the proportional flow valve can stably work on different working conditions, and the influence caused by high back pressure to the proportional flow valve is avoided.

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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