Dome valve and dome valve automatic control system used in pneumatic conveying system

Abstract

A dome valve for a pneumatic conveying system comprises a valve body, a semi-spherical valve element arranged in the valve body, a drive crank used for driving the semi-spherical valve element to rotate and a pneumatic executing element connected with the drive crank. The valve body comprises an upper valve body and a lower valve body which are assembled together. The upper valve body is provided with a valve opening and a seal air bag. The lower valve body is internally provided with a valve element installation seat. The dome valve has the beneficial effects that in the valve opening and closing process, the semi-spherical valve element does not make contact with the seal air bag or generate friction with the seal air bag during rotating, so that wear is avoided; and meanwhile, the semi-spherical valve element is long in service life and convenient to replace.

Description

technical field [0001] The invention belongs to the field of industrial valves, in particular to a dome valve used in a pneumatic conveying system, and also relates to an automatic control system for the dome valve. Background technique [0002] In the industrial field, especially in the field of pipeline medium transportation, industrial valves are widely used. Among them, the dome valve is widely used in the pneumatic ash conveying system of coal-fired power plants. It is generally composed of a valve body, a hemispherical valve core, a sealing air bag, and a driving crank arm. Turn to open to realize opening and closing of the valve. During the continuous opening and closing process of the dome valve, the surface of the dome valve plate will gradually wear and tear, resulting in a decrease in sealing performance, which needs to be replaced; in the current dome valve, the valve body and the dome valve plate are fixed structures. When the top valve plate needs to be repla...

AI Technical Summary

Problems solved by technology

During the continuous opening and closing process of the dome valve, the surface of the dome valve plate will gradually wear and tear, resulting in a decrease in sealing performance and needs to be replaced; in the current dome valve, the valve body and the dome valve plate are fixed structures, once round When the top valve plate needs to be replaced, only the whole dome valve can be replaced, which is costly and labor-intensive

[0003] In addition, in the current dome valve structure, there is a gap between the hemispherical spool and the valve port, which can reduce or eliminate the wear on the contact surface between the hemispherical spool and the valve port. The sealing of the valve port in this structure is basically It is realized by sealing the airbag, but the airbag is also susceptible to friction on the surface of the valve core. Once the sealed airbag is damaged, the sealing effect will decrease and affect the use

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