A relief valve suitable for compensating hydraulic power in back pressure condition

Abstract

The utility model relates to an overflow valve suitable for compensating hydraulic power in working conditions with back pressure, which belongs to the technical field of aerospace servo systems. The valve body is provided with an inlet A, an outlet B, an overflow port C and an oil discharge port D, and a chamber e, an oil chamber f and a spring chamber g are formed between the valve body and the valve core, and the overflow port C and The oil chamber f is connected, the valve core and the valve body are provided with a valve port at the inlet end of the oil chamber f, and a flange structure is provided at the valve core near the valve port. The stepped design, hollow design and parallel double spring design adopted by the valve core of the present invention make the valve compact in structure and have a large thrust-to-weight ratio. By setting a damping hole on the spool, the oil is replenished in time during the retraction process of the spool, which effectively eliminates the "stuck" phenomenon of the spool. By reasonably matching the throttling area of ​​the damping hole of the spool and the damping hole of the oil return port, the adverse effect of the back pressure of the overflow port on the balance of the spool is effectively eliminated.

Description

technical field [0001] The invention belongs to the technical field of aerospace servo systems, and in particular relates to an overflow valve suitable for compensating hydraulic power in working conditions with back pressure. Background technique [0002] As the pressure control element of servo energy, the relief valve is mainly used for constant pressure and relief. When used as a safety valve, it can also play the role of preventing overload and safety protection. Compared with general hydraulic systems, aerospace servo systems often have the characteristics of high pressure and large flow, which put forward higher requirements for the reliability, pressure stabilization accuracy and thrust-to-weight ratio of relief valves. Specifically, the constant pressure spring and valve core assembly of the relief valve used in the aerospace system should have a relatively large thrust-to-weight ratio, and the hydraulic power fluctuation of the valve port should be as small as poss...

AI Technical Summary

Problems solved by technology

Finally, under the load sudden drop condition of the ordinary relief valve, the large thrust spring pushes the spool to reset, which often causes jamming due to vacuum, which is not allowed in the aerospace servo system

Although the above-mentioned problems can be alleviated simply by improving the machining accuracy and selecting materials with superior performance, the cost is relatively high. This patent aims to alleviate the above-mentioned problems from the perspective of optimizing the structural design

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