A noise reduction relief valve with balanced hydrodynamic force and adjustable damping function

Abstract

The invention provides a noise reduction overflow valve with hydrodynamic force balancing and adjustable damping functions. A flow baffle is fixedly connected with the end, close to an oil return cavity, of an overflow valve element. A flow blocking circular groove surrounding the overflow valve element in a circle is formed in the end face of the side, facing an oil inlet cavity, of the flow baffle. The intersection of the extension cord of the generatrix of the conical surface of the overflow valve element and the end face of the flow blocking circular groove is located in the middle of the whole circular groove face. The flow blocking circular groove is additionally formed, and after oil is jetted to the flow blocking circular groove at a high speed through a valve opening, the impact force exerted on the valve element is generated on the flow blocking circular groove, the direction of the impact force is the direction for making the valve opening become larger and is opposite to the direction of the hydrodynamic force of the impact force, the influences of the hydrodynamic force on the pressure of the oil inlet cavity of the overflow valve are restrained, and the pressure regulation accuracy is improved. The noise reduction overflow valve is further additionally provided with a damping hole, a damping piston and a damping regulation mechanism, the damping piston is in small clearance fit with the damping hole, a damping cavity is formed, different types of damping can be exerted on the overflow valve element through the damping regulation mechanism, the vibration of the overflow valve element is reduced, and the vibration and noise reduction effects are achieved.

Description

technical field [0001] The invention relates to an overflow valve for vibration reduction and noise reduction, in particular to a noise reduction overflow valve with balanced hydraulic power and adjustable damping. Background technique [0002] When the pressure oil in the oil inlet chamber pushes the relief valve spool and opens the overflow passage, the liquid flows from the oil inlet chamber through the valve port to the oil return chamber, which will form a force on the valve core, that is, hydraulic power. According to the principle of fluid mechanics, the direction of the hydraulic force on the valve core is the direction in which the valve port is closed. From the perspective of static performance, the following force balance equation is satisfied: [0003] (1) [0004] in, - Spring precompression force; - the area where the oil acts on the spool; [0005] - pressure in the oil chamber; - hydraulic power [0006] Therefore, the pressure in the oil inlet c...

AI Technical Summary

Problems solved by technology

[0018] Due to the small viscous damping of the spool of the conventional relief valve, the spool vibrates greatly when it is opened or subjected to external disturbances (such as changes in overflow flow), which will have adverse effects on the operation of the equipment and the environment

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