Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (9): 2499-2507.doi: 10.13229/j.cnki.jdxbgxb.20211265

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Flow characteristics analysis of constant flow control valve based on AMESim

Jia-yi WANG1(),Xin-hui LIU1,Zhan WANG2,Jin-shi CHEN1(),Ya-fang HAN3,Yu-qi WANG1   

  1. 1.School of Mechanical and Aerospace Engineering，Jilin University，Changchun 130022，China
    2.BBK Test Systems Co. ，Ltd. ，Beijing 101102，China
    3.Shanghai Aircraft Design and Research Institute，Shanghai 200232，China
  • Received:2021-11-23 Online:2023-09-01 Published:2023-10-09
  • Contact: Jin-shi CHEN E-mail:jywang13@jlu.edu.cn;spreading@jlu.edu.cn

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Abstract:

To study the constant flow mechanism of the constant flow control valve， the influence of flow area and gradient on the characteristics of constant flow control valve are analyzed based on the actual structure of a certain type of valve. Firstly， the mathematical model， the control theoretical model and the transfer function block diagram of the dynamic system are established to quantitatively analyze the influence of these factors. Then the AMESim simulation model is established， and the influence mechanism of these factors on the steady-state and dynamic characteristics of the valve is analyzed. The reliability of the simulation model is verified by the experiment. The results show that there exists negative feedback between stages in the constant flow control valve， which compensates the pressure difference between the two sides of throttle and reduces the flow adjustment deviation. Adjusting the flow area of the pressure compensator can improve the steady-state characteristics of the constant flow control valve. Adjusting the flow area gradient of the pressure compensator can significantly improve the static and dynamic characteristics of the constant flow control valve.

Key words: mechanical design, constant flow control valve, flow area, AMESim, steady-state characteristics, dynamic characteristis

CLC Number: 

  • TH137.5

Fig.1

Structure of constant flow control valve"

Fig.2

Valve sleeve profile structure"

Fig.3

Shape expansion diagram of three axis distribution valve ports"

Fig.4

Structure of constant flow control valve damping"

Fig.5

Dynamic system block diagram"

Fig.6

System test loop"

Table 1

Pressure difference-flow relationship in testing"

压差/MPa流量/（L·min-1）压差/MPa流量/（L·min-1）
1.02.824.02.90
1.52.904.52.92
2.02.915.02.95
2.52.855.52.98
3.02.876.03.00
3.52.89

Table 2

Basic parameters"

参 数数值
阀芯直径/mm3.6
阀套直径/mm5.5
压力补偿器开孔直径/mm1.2×5
节流口直径/mm1.56
弹簧刚度/（N·mm-1）3.43
弹簧预紧力/N6.86
射流角/（°）69
油液密度/（g·cm-3）0.86
流量系数0.69

Fig.7

AMESim simulation model of constant flow control valve"

Fig.8

Valve control form"

Fig.9

Steady state characteristic curve of constant flow control valve"

Fig.10

Flow curve with pressure"

Fig.11

Distribution diagram of three holes"

Fig.12

Distribution diagram of seven holes"

Fig.13

Pressure difference flow curve under different overcurrent area"

Fig.14

Axial equidistant distribution diagram of five-axis"

Fig.15

Equidistant distribution diagram of uniaxial axis"

Fig.16

Simulation model of hole five-axis distribution"

Fig.17

Simulation model of uniaxial distribution"

Fig.18

Area gradient under different pore distribution"

Fig.19

Flow change curve of three kinds of valves under load step input"

Fig.20

Flow variation curve under different load step pressure with the equidistant distribution of the three-axis"

Fig.21

Flow variation curve under different load step pressure with the equidistant distribution of the five-axis"

Fig.22

Flow variation curve under different load step pressure with equidistant distribution of single axis"

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