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Device used for restraining self-excited oscillation of servo valve and capable of adjusting orifice area

A self-excited oscillation, servo valve technology, applied in the direction of fluid pressure actuation device, servo meter circuit, fluid pressure actuation system components, etc. Servo valve support and other issues

Active Publication Date: 2017-06-13
HUATIAN ENG & TECH CORP MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these will lead to more prominent pressure fluctuations in the hydraulic system
The nozzle baffle servo valve used in the system is particularly susceptible to self-excited oscillation caused by this pressure fluctuation disturbance
The self-excited oscillation phenomenon of the servo valve is commonly known as howling. It is usually a high-frequency oscillation, which is particularly easy to damage the supports and other parts in the servo valve, which will cause the servo valve and the entire hydraulic system to fail to work.
At present, this problem is still being studied in the industry, and there is no generally effective measure to completely eliminate it.

Method used

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  • Device used for restraining self-excited oscillation of servo valve and capable of adjusting orifice area
  • Device used for restraining self-excited oscillation of servo valve and capable of adjusting orifice area
  • Device used for restraining self-excited oscillation of servo valve and capable of adjusting orifice area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, a device for suppressing self-excited oscillation of a servo valve with an adjustable orifice area includes a valve seat 1, a slide valve 2 adapted to the valve seat 1, an oil return hole of the valve seat, and an oil return hole arranged on the valve seat throttling device inside;

[0020] The inlet of the oil return hole of the valve seat is set correspondingly to the jet area of ​​the nozzle baffle, and the throttling device includes a cone valve core 4 which is threadedly connected with the inner wall of the oil return hole of the valve seat and is threadedly connected with the oil return hole of the valve seat. The cone valve seat 3; the center of the cone valve seat 3 is provided with a first flow hole 5, and the cone valve core 4 is fixedly connected with a cone 7 on the opposite end surface of the cone valve seat 3, and the cone 7 The diameter of the bottom surface of the cone valve core 4 is smaller than the diameter of the cone valve core 4...

Embodiment 2

[0024] Based on the above embodiment, the cone valve core 4 in this embodiment is fixedly connected to the inner wall of the oil return hole of the valve seat, the cone valve core 4 is arranged close to the inlet of the oil return hole of the valve seat, and the cone valve seat 3 is connected to the oil return hole of the valve seat. The opposite end surface of the cone valve core 4 is provided with a screw hole; or,

[0025] The cone valve seat 3 is fixedly connected with the oil return hole of the valve seat, the cone valve seat 3 is set close to the oil return hole of the valve seat, and the cone valve core 4 is set on the opposite end surface of the cone valve seat 3 With screw holes.

[0026] In this embodiment, the distance between the cone valve core 4 and the adjustable cone valve can be changed by screwing the screw hole, and then the flow area of ​​the orifice can be adjusted to achieve a balance between stability and other flow characteristics, and suppress the self...

Embodiment 3

[0028] Based on the above embodiment, the diameter of the bottom surface of the cone 7 at the bottom end of the cone valve core 4 in this embodiment is larger than the diameter of the first flow hole 5;

[0029] The center of the poppet valve core 4 is provided with a third flow hole, and the diameter of the third flow hole is smaller than that of the first flow hole 5;

[0030] The inlet end of the first flow hole 5 on the end surface corresponding to the cone valve seat 3 and the cone valve core 4 is a slope, and the inclination angle is compatible with the cone of the cone valve core 4;

[0031] When the cone of the cone spool 4 enters the first through hole 5 and the cone of the cone spool 4 cooperates with the port on which the first flow hole 5 is inclined, the cone valve The flow between the core 4 and the cone valve seat 3 only passes through the third flow hole and the flow area is the smallest;

[0032] The third flow hole in this embodiment is used to prevent the c...

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Abstract

The invention discloses a device used for restraining self-excited oscillation of a servo valve and capable of adjusting an orifice area. The device comprises a valve seat, a slide valve adaptive to the valve seat, a valve seat oil return hole and a throttling device arranged in the valve seat oil return hole, wherein an inlet of the valve seat oil return hole is formed corresponding to a nozzle flapper jet region; the throttling device comprises a cone valve element in threaded connection with the inner wall of the valve seat oil return hole, and a cone valve seat in threaded connection with the valve seat oil return hole; when the top end of a cone of the cone valve element is not intersected with the end face of the cone valve seat, the through-flow between the cone valve element and the cone valve seat is maximum; a through-flow area between the cone valve element and the cone valve seat is gradually reduced along with the cone of the cone valve element entering a first through-flow hole of the cone valve seat. According to the device provided by the invention, through changing the distance between the cone valve element and the cone valve seat, a throttling area and the oil return backpressure are changed, cavitation of the jet region is reduced, and the self-excited oscillation of the servo valve is restrained.

Description

technical field [0001] The invention relates to a device for suppressing self-excited oscillation of a servo valve with adjustable orifice area. Background technique [0002] The hydraulic system is developing towards miniaturization and integration in aerospace and other fields. The pumps, servo valves, hydraulic cylinders and other components of the hydraulic system are integrated in the manifold. But these will lead to more prominent pressure fluctuations in the hydraulic system. The nozzle baffle servo valve used in the system is particularly susceptible to the self-excited oscillation phenomenon caused by the pressure fluctuation disturbance. The self-excited oscillation phenomenon of the servo valve is commonly known as howling. It is usually a high-frequency oscillation, which is particularly easy to damage the supports and other parts in the servo valve, which will cause the servo valve and the entire hydraulic system to fail to work. At present, this problem is st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B21/00
CPCF15B21/008F15B2211/8609F15B2211/8613
Inventor 陈猛卫卫石海军
Owner HUATIAN ENG & TECH CORP MCC
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