Gas pipeline liquid metal sealing valve for high-temperature environment

Abstract

The invention discloses a gas pipeline liquid metal sealing valve for high-temperature environment. The gas pipeline liquid metal sealing valve comprises a valve body provided with a gas inlet and a gas outlet, wherein the bottom of the valve body is provided with a cone-shaped sealing ring and a sealing groove filled with liquid metal, an acting mechanism is arranged on the valve body, the lower end of the acting mechanism is connected with an isolation cover body structure, the isolation cover body structure comprises an outer protecting cover and an inner sealing cover which are respectively matched with the cone-shaped sealing ring and the sealing groove, and the inner side of the upper part of the valve body is provided with a groove in the size slightly greater than that of the outer protecting cover. The gas pipeline liquid metal sealing valve has the advantages that by aiming at the problems of the liquid sealing structure that under the high temperature and high pressure conditions, in the process that a valve rod drives a sealing cover structure to downwards move, the liquid splashing can easily occur, and the pressure is unstable, a new technical scheme is provided, a sealing mode of coned-shaped sealing at the outer side and liquid metal sealing at the inner side is adopted, the technical effect of absolute sealing of the inner sealing cover is easily realized, in addition, the use period of equipment is long, the loss is low, and the economic benefits are realized to the maximum degree.

Description

technical field [0001] The invention relates to the technical field of gas valves, in particular to a liquid metal sealing valve for gas pipelines used in high-temperature environments. Background technique [0002] The sealing technology of the on-off control part of the high-temperature gas system pipeline is an urgent problem to be solved in the relevant field at present. The traditional control method generally adopts the disc globe valve. The disc globe valve has a large gap between the valve cover and the valve body, is easy to wear, and is easy to rust, so the sealing performance is poor, and frequent maintenance and replacement are required, resulting in increased purchase and use costs. In addition, in the existing stop valve, the contact surface between the valve body and the valve cover is usually set as a large plane, and the two hard planes are contacted and sealed. Or impurities accumulate on the plane, resulting in a loose fit between the contact surface and ...

AI Technical Summary

Problems solved by technology

The disc globe valve has a large gap between the valve cover and the valve body, is easy to wear, and is easy to rust, so the sealing performance is poor, and frequent maintenance and replacement are required, resulting in increased purchase and use costs.

In addition, in the existing stop valve, the contact surface between the valve body and the valve cover is usually set as a large plane, and the two hard planes are contacted and sealed. Or impurities accumulate on the plane, resulting in a loose fit between the contact surface and the valve cover, which reduces the sealing performance, especially when the temperature reaches 400-600°C or even higher, the current valve body cannot meet the requirements of complete cut-off. requirements, then for the opening and closing of flammable gases or even toxic gases, long-term leakage may cause workers to face great safety hazards, even life-threatening, which is not conducive to safe production and operation of workers' lives, health and safety.

The connecting flange of the high-performance stop valve is usually integrally cast with the shell and made by machining. Its structure is heavy and the production cost is high, and it cannot fundamentally solve the corresponding problems.

Some people also choose liquid-sealed valves, which are very convenient to use, but the liquid is easily splashed due to the unbalanced air pressure when the liquid-sealed valve cover is lowered during use, and even causes liquid overflow to cause seal failure, and the choice of liquid limits the operating temperature. , the general solution and its mixture are difficult to continue to use under the condition of over 100 ℃, and it is difficult to effectively exert its effective sealing characteristics under high temperature conditions

Images