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Pilot type proportional flow valve and control method

A proportional flow valve and pilot valve technology, which is used in fluid pressure actuation devices, fluid pressure actuation system testing, threaded fasteners, etc., can solve the problems of low flow control accuracy, large pressure differential loss, and low accuracy. Achieve the effect of promoting intelligence, increasing the range of flow control, and maintaining a wide range of system pressure differences

Active Publication Date: 2020-09-01
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problems of the existing proportional flow valve with complex structure, low flow control precision and large pressure loss; to solve the problems of high cost and low precision when using pressure sensor control, and to provide a simple structure, simple control, Pilot-operated proportional flow valve with small pressure loss, high flow control accuracy and large regulation range

Method used

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  • Pilot type proportional flow valve and control method

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Experimental program
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Effect test

Embodiment 1

[0048] Such as figure 1 As shown, a pilot-operated proportional flow valve includes a proportional pilot valve 1 and a main valve 4 . Pilot proportional valve 1 includes pilot valve spool 2, pilot valve proportional solenoid 3, pilot valve oil inlet A y and pilot valve outlet B y ;The main valve 4 includes the main valve spool 5, the main valve sleeve 6, the main valve oil inlet A, the main valve oil outlet B and the main valve control chamber X; the main valve oil inlet A passes through the third flow of the main valve 4 Road L 3 Connected throttle groove C x , throttle groove C x The throttling edge K of the main valve sleeve 6 communicates with the control chamber X of the main valve 4 .

[0049] At the same time, between the main valve 4 and the pilot proportional valve 1, an active control type differential pressure compensator 7 is added. Main valve control chamber X and compensator oil inlet A 2 Connected, compensator oil outlet B 2 Simultaneously with pilot val...

Embodiment 2

[0053] Such as image 3 As shown, the second embodiment of a novel pilot-operated proportional flow valve and its control method of the present invention is the same as the first embodiment in terms of structural composition and connection relationship, and the difference is:

[0054] Active control differential pressure compensator 7 is controlled by rotating motor 13 to drive ball screw 15, including compensator spool 8, compensator valve body 9, compensator spring 10, rotating motor 13, bearing 14, ball screw 15, push Rod 16, encoder 20, compensator oil inlet A 2 , Compensator oil outlet B 2 , Compensator spring chamber C 1 and compensator without spring chamber C 2 The compensator spool 8 is arranged in the compensator valve body 9, one end of the compensator spring 10 acts on one end face of the compensator spool 8, the other end acts on the compensator valve body 9, and is connected with the compensator spool 8 form the compensator spring chamber C 1 , the rotating ...

Embodiment 3

[0057] Such as Figure 5 As shown, the third embodiment of a novel pilot-operated proportional flow valve and its control method of the present invention is the same as the first embodiment in terms of structural composition and connection relationship, the difference is that the main valve 4 is provided with a second displacement sensor 17 ; The second displacement sensor 17 is connected with the main valve spool 5 to detect the displacement of the main valve spool 5 in real time.

[0058] Such as Figure 6 As shown, when the active control type differential pressure compensator 7 controls the differential pressure, the steps are the same as in the first embodiment, and a nonlinear compensation algorithm is further added. The nonlinear compensation algorithm is: according to the formula In the formula, the opening area A of the proportional pilot valve is related to the displacement of the pilot valve spool 2. There are different calculation methods according to the struct...

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Abstract

The invention discloses a pilot type proportional flow valve. The pilot type proportional flow valve comprises a proportional pilot valve communicating with a pilot cavity of a main valve, wherein a differential pressure compensator is arranged between the main valve and the proportional pilot valve, the differential pressure compensator compensates inlet and outlet differential pressure of the proportional pilot valve, the differential pressure compensator is an active control type differential pressure compensator and is provided with a valve element linear control device and a valve elementdisplacement real-time detection device, a signal output port of the valve element displacement real-time detection device is connected with a processor, and the processor is connected with and controls the valve element linear control device. The pilot type proportional flow valve solves the problems that a valve port adopts a method of correcting closed-loop control flow by a differential pressure sensor, the control precision of the pressure sensor is limited, the pressure sensor needs a large working range, but the compensation differential pressure is relatively small and is in the sameorder of magnitude as the pressure fluctuation in the system, so that fluctuation of flow is large due to small pressure change, and the stability is poor.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a pilot-operated proportional flow valve and a control method. Background technique [0002] The proportional flow control valve is one of the important components of the hydraulic system. Through the control of the flow, the control of the actuator speed is realized. There are two types of proportional flow control valves: direct-acting and pilot-operated. For large-flow valves, the pilot-operated control method is usually used. [0003] According to the calculation formula of the flow rate of the valve port, the output flow rate of the control valve is the product of the flow coefficient, the area of ​​the valve opening and the square root of the pressure difference before and after the valve port. The flow is simply the product of the valve opening area and the square root of the differential pressure. Due to the difficulty of directly detecting the flow rate, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B13/02F16B19/00
CPCF15B13/021F15B13/026F15B19/00
Inventor 权龙王波葛磊赵斌汪成文
Owner TAIYUAN UNIV OF TECH
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