Real-time observation device of valve port jet erosion

Abstract

The invention discloses a real-time observation device of valve port jet erosion. A sinking trough is processed in a lower cover plate (3), and a simplified valve element (4) is arranged in the sinking trough; a valve port regulating cam (6) is arranged at one end of the simplified valve element (4), and a plane waveform spring (7) is arranged at the other end; a large sealing ring (8) is arrangedin the lower cover plate (3) along the side, a positioning bracket (9) is arranged on an experimental table board, and a pair of rotating brackets (5) are arranged on the positioning bracket (9); anupper cover plate (1) is fixed on the rotating brackets (5), bolts orderly penetrate through the upper cover plate (1), a transparent plate (2), the lower cover plate (3) and the internal module thereof, the rotating brackets are tensioned so as to compress the large sealing ring (8), the rotating brackets (5) are regulated so as to be vertical to the experimental table board; a micro-lens (11) isarranged on a high-speed camera (10) and vertical to the transparent plate (2), and is aligned with the simplified valve element (4).

Description

technical field [0001] The invention relates to the research field of valve port jet flow in a hydraulic system, in particular to a visualization experiment technique for valve port erosion by particle-containing jet flow. Background technique [0002] The prior art "Jet Erosion Wear Tester" (Application No. 201520126121.0) discloses an experimental device suitable for simulating erosion of turbine blades by sandy jets. The device sprays sandy jets into the Experiments are carried out on experimental samples. The current experimental device for jet erosion is similar to this device, which studies the erosion of the research object by the free jet without boundaries. This situation is more common in hydraulic equipment, and the hydraulic valve port is also a common part of the jet. This type of jet is a submerged jet with boundary constraints, and there are few related experimental studies and experimental devices for the erosion of this type of jet. [0003] Engineering pr...

AI Technical Summary

Problems solved by technology

When the hydraulic system is working, the tiny particles that invade the hydraulic system invade the hydraulic valve along with the oil. When the valve port is small, a jet flow is formed at the rear end of the valve port, and the tiny particles pass through the valve port with the high-speed jet. This process continues to accumulate, causing the valve port to generate Erosion wear destroys the hydraulic valve's ability to control oil, especially for high-precision hydraulic slide valves such as servo valves, which can easily lead to zero deviation, zero drift and zero position leakage

Due to the fast jet velocity at the valve port, it is difficult for conventional observation methods to accurately capture the movement of tiny particles

In addition, valve port erosion needs to go through a long-term accumulation process, but the hydraulic system cannot operate in contaminated oil for a long time, so how to solve the contradiction between the two has become a difficult point

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