Switching mechanism of overflow safety valve

Abstract

The invention discloses a switching mechanism of an overflow safety valve. The switching mechanism comprises a liquid inlet connector and a valve core component, wherein a liquid inlet hole is formed in the liquid inlet connector; the valve core component is removable relative to the liquid inlet connector and is used for controlling the switching on and off of the liquid inlet hole; the valve core component comprises a nut and a valve pad which is arranged in the nut; the valve pad is provided with a sealing surface which is matched with the liquid inlet connector; the sealing surface is a spherical surface. According to the switching mechanism of the overflow safety valve, disclosed by the invention, through matching of the removable valve core component and the liquid inlet connector, the valve core component can be used for controlling the switching on and off of an oil way from the liquid inlet hole to a liquid outlet hole, large-flow overflow can be realized after the valve core component is far away from the liquid inlet connector, the flow of the overflow safety valve is greatly increased, the axial displacement of the valve core component can be lessened by fast overflow in a short time, the axial deformation of a reset spring is reduced when the axial displacement of the valve core component is lessened, and the pressure fluctuation can be finally reduced.

Description

technical field [0001] The invention belongs to coal mine fully mechanized mining hydraulic support, in particular, the invention relates to an opening and closing mechanism of an overflow safety valve. Background technique [0002] With the large-scale implementation and development of coal mine fully mechanized mining hydraulic supports, fully mechanized mining work has more and more stringent requirements for hydraulic supports, so there are further requirements for the safety valve of the hydraulic cylinder of the protection support, especially for the safety valve There are further requirements for the service life and reliability of the hydraulic support. When the pressure from the top of the hydraulic support causes passive force, whether the safety valve can unload in a short time, fully and stably under the condition of high pressure directly affects the service life of the support. and support security. It will not only damage seals, pipes and hydraulic components...

AI Technical Summary

Problems solved by technology

[0004] The overflow channel of the existing safety valve adopts the liquid passage hole arranged around the side wall of the valve core. The diameter of the liquid passage hole is small, resulting in small discharge flow and large flow loss. The seat bears the axial force exerted by the return spring, which leads to poor stress on the valve core and large pressure fluctuations during the working process, which leads to generally unsatisfactory closing pressure of the safety valve, and eventually leads to failure of the hydraulic components connected to the safety valve. Such as excessive loss of oil in the high-pressure cylinder, resulting in waste

The sealing effect between the spool and the valve sleeve is not ideal, and the processing accuracy of the groove on the surface of the spool for installing the seal is not easy to control

In addition, the spring cavity inside the valve housing is in an open state, and the dustproof, waterproof and rustproof effects are poor, which reduces the service life of the safety valve

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