Self-grinding and self-rotating three-way reversing disc valve

Abstract

The invention provides a self-grinding and self-rotating three-way reversing disc valve. A closed valve cavity is formed among an upper valve body 10, a lower valve body 1 and a middle body 3. The lower valve body 1 is provided with an inlet. The upper valve body 10 is provided with a first outlet and a second outlet. Valve seats 9 are arranged on the upper valve body 10 and the lower valve body 1 correspondingly. The valve seats are in sealed fit with upper and lower valve discs 4. The upper and lower valve discs 4 are in pressing fit on the sealing faces of the valve seats 9 through elastic supports. The center axes where the upper and lower valve discs 4 are located, the center axis where the inlet of the lower valve body 1 is located and the center axis where the first outlet in the upper valve body 10 is located do not coincide with one another, and eccentricity exists. The upper and lower valve discs 4 can achieve self-rotating around the center axes of the upper and lower valve discs 4. A sharp corner is formed at the junction of the side face and the bottom face of each valve disc (4). In the movement process of the valve, the valve discs (4) rotate around a valve rod and meanwhile achieve self-rotating around the center axes of the valve discs (4), the sealing faces are constantly ground and polished, and the service life of the valve is prolonged. In the valve reversing process, the sharp-edge valve discs (4) constantly scrape foreign matter on the sealing faces, the situation that particle media enter the sealing faces to cause damage is avoided, and the service life of the valve is prolonged.

Description

technical field [0001] The invention relates to a disc valve, in particular to a self-grinding rotary three-way reversing disc valve. Background technique [0002] In material systems such as polysilicon, coal chemical industry, power plant ash removal, mud, boiler slag discharge, ore pulp, etc., it is often necessary to switch between three different process media, and two media require automatic switching, one is slurry containing particles, And it is easy to crystallize, and the other is a medium such as acidic water. The three-way valve with the traditional structure has the following problems: (1) During the switching process, the valve core and the two valve seats cannot be in contact at the same time, which will cause the accumulation and crystallization of slurry particles in the empty contact stage, so it is not suitable It is necessary to frequently switch between the occasions; (2), the traditional three-way valve seat needs to be pressed to the valve core by med...

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Problems solved by technology

The three-way valve with the traditional structure has the following problems: (1) During the switching process, the valve core and the two valve seats cannot be in contact at the same time, which will cause the accumulation and crystallization of slurry particles in the empty contact stage, so it is not suitable It is necessary to frequently switch between the occasions; (2), the traditional three-way valve seat needs to be pressed to the valve core by medium pressure to achieve sealing, so it is impossible to completely eliminate the granular medium between the valve core and seat sealing pair when the valve is sealed, often causing the valve The closure is not tight, leakage occurs, and because the medium particles continue to accumulate near the sealing pair, the valve will fail over time; (3), the valve core and seat always have a large mutual friction during the valve opening and closing process, which is easy to cause valve failure. The service life is short, generally not more than 3 months; (4), the traditional structure valve often occurs "locking" phenomenon when it expands at high temperature, and the normal switching function of the valve cannot be realized, and the working conditions are greatly restricted

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