Ball sealing structure and hydraulic valve

Abstract

The invention discloses a ball sealing structure. The ball sealing structure comprises a ball and a first valve element, wherein a valve port is formed in the surface of the first valve element; the diameter of the valve port is smaller than that of the ball; a conical sealing face is arranged at the valve port; an arc sealing face consistent with the arc face of the ball is arranged on the conical sealing face; and the ball abuts against the arc sealing face so that the sealing structure can be formed. The ball sealing structure and a hydraulic valve are reasonable in design, simple in structure and capable of achieving sealing under the ultrahigh pressure and multi-dust working conditions.

Description

technical field [0001] The invention relates to the technical field of ultra-high pressure components, in particular to a ball sealing structure and a hydraulic valve. Background technique [0002] The hydraulic valve is an automatic component operated by pressure oil. It is controlled by the pressure oil of the pressure distribution valve and can be used to control the on-off of oil, gas and water pipeline systems. The common structure of the hydraulic valve is: a sphere is set at the front end of the flow channel of the spool, when the hydraulic oil flows forward, the flow pressure of the fluid can break the sphere, and the hydraulic oil can flow normally; when the hydraulic oil flows reversely , the ball will block the flow channel to form a cut-off effect and prevent the reverse flow of hydraulic oil. For ultra-high pressure working conditions, due to the severe impact of high-pressure hydraulic oil on the O-ring, the O-ring is easily washed away. When the ball returns ...

AI Technical Summary

Problems solved by technology

For ultra-high pressure working conditions, due to the severe impact of high-pressure hydraulic oil on the O-ring, the O-ring is easily washed away. When the ball returns to the sealing position, the high-pressure oil will leak due to the lack of sealing of the O-ring, resulting in O The sealing ring fails when it is in a static state, so only a hard seal structure can be used between the valve core and the ball

[0003] At present, the hard seal structure of the spool and the ball is mainly divided into three types: the first one is that the edge of the valve port of the flow channel of the spool collides with the sphere to form a line seal, but because the edge of the valve port is easy to A gap will be generated, which will lead to seal failure; the second is to set a conical sealing surface at the flow passage of the valve core to form a line seal with the ball, but because the conical sealing surface of the valve core is being processed, the sealing line cannot be processed to be completely in line with the ball. The spheres are consistent, so there will be a small gap between the sphere and the annular line seal formed by the conical sealing surface, and a complete seal cannot be guaranteed; the third is to set a large area consistent with the arc surface of the sphere at the flow channel of the valve core. The arc sealing surface is used to form a surface seal with the sphere, but in coal mines and other fields, the hydraulic oil usually contains dust. Due to the large contact area between the sphere and the arc sealing surface, dust is easy to accumulate on the sphere and the arc sealing surface on the contact surface, resulting in seal failure

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