Four-eccentricity butterfly valve

Abstract

The invention provides a four-eccentricity butterfly valve, and belongs to the technical field of eccentric butterfly valves. The four-eccentricity butterfly valve comprises four eccentricity structures. The engaging angle of the butterfly valve can be adjusted through the four eccentricity formed by the rotation center axis of a valve seat and the plain line of the section of a sealing surface of the valve seat, and therefore the third eccentricity and the fourth eccentricity can be changed according to the requirements of the working conditions, various reasonable engaging angles beta are designed in different environments, the size of the second eccentricity can be reduced, and opening with small torque is achieved. The four-eccentricity butterfly valve is simple in structure, the torque of opening of the valve is effectively reduced, the energy consumption of an actuator for driving of the valve can be greatly reduced, and therefore energy saving and environmental protection are effectively achieved.

Description

technical field [0001] The invention relates to a novel butterfly valve, which belongs to the technical field of eccentric butterfly valves, in particular to a four-eccentric butterfly valve. Background technique [0002] Usually in the valve industry, the butterfly valve is one of the commonly used valve types. The butterfly valve has been continuously improved from the centerline butterfly valve (single eccentric) to the double eccentric butterfly valve, and then to the triple eccentric butterfly valve. After each improvement, the torque on the valve stem is It is easier to open, although the triple eccentric is a very good structure, compared with the single eccentric and double eccentric, the opening torque is greatly reduced, and the triple eccentric butterfly valve cannot freely design a reasonable meshing angle through different working conditions, resulting in butterfly valves The opening torque is relatively large, and it is not energy-saving and environmentally fri...

AI Technical Summary

Problems solved by technology

Although this invention is also a four-eccentric butterfly valve, its fourth eccentricity means that there is an angle difference between the half-angle of the major axis and the half-angle of the minor axis of the elliptical cone, and the cross section of the sealing surface formed by the sealing ring and the valve seat is a perfect circle or approximately positive. Although this kind of eccentricity can well solve the problem of seal replacement wear when the butterfly valve is opened and closed, this invention cannot effectively reduce the torque required for valve opening, thus failing to achieve environmental protection and energy saving

[0004] A four-eccentric butterfly valve and its design method are disclosed in the Chinese invention patent specification CN102141156B. The main problem to be solved in the invention is the interference between the dynamic and static sealing surfaces of the four-eccentric butterfly valve, although the four-eccentric butterfly valve in this invention also has the advantages of small operating torque. , but the design algorithm of the invention is complicated, which only theoretically provides support for the design of the four-eccentric butterfly valve, which is not conducive to the production, processing and manufacturing of industrial butterfly valves.

Although the invention has the advantages of simple structure, no friction between the sealing surfaces, good sealing effect, corrosion resistance, long service life, can reduce the flow channel area, reduce the closing torque, reduce the selection cost of the actuator, and is easy to install and neutral Good and other advantages, but the invention is to reduce the closing torque of the valve by deflecting the elliptical cone of the elliptical sealing pair and the center line of the valve flow channel. This method is essentially the same as the principle of reducing the torque of the valve opening and closing in the present invention The difference is that the invention does not disclose a four-eccentric butterfly valve for effectively reducing the valve opening torque

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