Principle and Model of Proportional Flow Valve with Simple Structure and without Displacement Dead Zone

ZHAO Junqi; WANG Chengwen; ZHAO Erhui; ZHAO Zankui; DU Wei

doi:10.7652/xjtuxb202207008

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Principle and Model of Proportional Flow Valve with Simple Structure and without Displacement Dead Zone

更新时间：2025-07-09

- Principle and Model of Proportional Flow Valve with Simple Structure and without Displacement Dead Zone
- Vol. 56, Issue 7, Pages: 67-75(2022)
- 作者机构：
  
  1. 太原理工大学机械与运载工程学院,太原,030024
  2. 太原理工大学新型传感器与智能控制教育部山西省重点实验室,太原,030024
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202207008
  CLC： TH137.52
- Online First：10 July 2022，
  
  Published：2022
- 稿件说明：
移动端阅览
ZHAO Junqi, WANG Chengwen, ZHAO Erhui, et al. Principle and Model of Proportional Flow Valve with Simple Structure and without Displacement Dead Zone[J]. 2022, 56(7): 67-75.
DOI：

ZHAO Junqi, WANG Chengwen, ZHAO Erhui, et al. Principle and Model of Proportional Flow Valve with Simple Structure and without Displacement Dead Zone[J]. 2022, 56(7): 67-75. DOI： 10.7652/xjtuxb202207008.

摘要

针对具有内部机械反馈的比例阀结构复杂、可靠性较低等问题

提出一种采用流量-位移反馈机制的三位四通比例流量阀原理与模型。给比例电磁铁施加电信号使先导阀芯产生运动

进而改变先导流量

使主阀芯两端压力失衡

主阀芯在压差作用下产生位移

而主阀位移又使主阀两端压力重新平衡

形成流量-位移反馈机制; 以三位四通阀作为主阀使比例流量阀可以控制负载运动速度与方向; 基于流量-位移反馈机制建立了三位四通比例流量阀的状态空间模型

推导出主阀芯位移与先导阀芯位移的近似函数关系。通过分析比例流量阀模型控制腔压力调节的范围

发现控制腔压力的下限值由零位时可变液阻等效面积与固定液阻直径决定

当阀芯离开零位时控制腔压力升高

其上限值为油源压力值。采用AMEsim仿真软件对所提出的三位四通比例流量阀模型进行仿真实验分析

分析结果表明:该比例流量阀结构简单、可靠性高

主阀芯位移与先导阀芯位移在零位附近为线性关系

且主阀阀芯位移在最大行程内没有死区; 当控制腔压力为油源压力的0.3倍时

主阀阀芯位移在阶跃信号下响应时间为0.01 s

在同等条件下与传统比例阀相比提高了50%。

Abstract

Aiming at the problems of complex structure and low reliability of proportional valves with internal mechanical feedback

a principle and model of 3-position 4-way proportional flow valve with flow-displacement feedback mechanism is proposed. Firstly

the electric signal is applied to the proportional solenoid to make the pilot spool move

and then change the pilot flow

so that the pressure at both ends of the main spool is unbalanced. The main spool is displaced under differential pressure

and such displacement rebalances the pressure at both ends of the main spool

forming a flow-displacement feedback mechanism. Then

with the 3-position 4-way valve as the main valve

the proportional flow valve can control the speed and direction of load movement. Finally

based on the flow displacement feedback mechanism

the state space model of the 3-position 4-way proportional flow valve is established

and the approximate functional relationship between the displacement of the main spool and that of the pilot spool is deduced. By analyzing the pressure regulation range of the control chamber of the proportional flow valve model

it is found that the lower limit of the control chamber pressure is determined by the equivalent area of variable hydraulic resistance and the diameter of fixed hydraulic resistance at zero position. When the valve core leaves zero position

the control chamber pressure increases

and its upper limit is the oil source pressure. AMESim simulation software is used to simulate and analyze the proposed 3-position 4-way proportional flow valve model. The analysis results show that the proportional flow valve has simple structure and high reliability. The displacement of main spool is linear with that of pilot spool near zero position

and there is no dead zone in the maximum stroke for main spool displacement. When the pressure of the control chamber is 0.3 times of the oil source pressure

the response time of the main spool displacement under the step signal is 0.01 s

which is 50% higher than that of the traditional proportional valve under the same conditions.

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Keywords

references

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