Five-eccentric butterfly valve

Abstract

Provided is a five-eccentric butterfly valve. An eccentric distance a is formed between a symmetrical central face of a sealing face of the valve and an axial central face of a rotating shaft, an eccentric distance b is formed between a flow channel central face and the radial central face of the rotating shaft, angle offset of an angle alpha is formed between the sealing face and the axial central face of the rotating shaft, an eccentric distance c is formed between the axial line of an oval cone frustum and the radial central face of the rotating shaft, and an eccentric distance d is formed between a sealing face at the lower end of the oval cone frustum and the axial central face of the rotating shaft. The five-eccentric butterfly valve has the advantages that the eccentric distance b between the flow channel central face and the radial central face of the rotating shaft can be reduced by adjusting the size of the parameter c and the parameter d through a mathematical analysis method, namely, the opening and closing torque of the valve can be reduced effectively, energy can be saved, consumption can be reduced, and cost can be lowered. The existence of the angle alpha is discovered through the research of the angle alpha formed by the sealing face and the axial central face of the rotating shaft, the sealing face of the valve is an inclined face, the opening angle and the closing angle of the valve are small, the opening speed and the closing speed are high, sealing specific pressure is even, sealing is reliable, safety of equipment is ensured, and the service life is prolonged.

Description

technical field [0001] The invention relates to a valve, specifically a five-eccentric butterfly valve. Background technique [0002] In the prior art, the butterfly valve has developed from centerline butterfly valve, single eccentric butterfly valve, double eccentric butterfly valve to triple eccentric butterfly valve. When this type of butterfly valve works, the rotation of the shaft drives the rotation of the valve plate, so that the conical surface of the valve plate is gradually squeezed towards the valve seat. Play a sealing role, so there will be a lot of friction between the valve plate and the valve seat, by reducing the eccentricity between the center surface of the flow channel and the axial surface of the rotating shaft Angle, to reduce friction, or to achieve no friction, to reduce the driving torque, but the existing technology has not made further breakthroughs after the development of the triple eccentric structure, and there are still shortcomings such as l...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the butterfly valve has developed from centerline butterfly valve, single eccentric butterfly valve, double eccentric butterfly valve to triple eccentric butterfly valve. When this type of butterfly valve works, the rotation of the shaft drives the rotation of the valve plate, so that the conical surface of the valve plate is gradually squeezed towards the valve seat. Play a sealing role, so there will be a lot of friction between the valve plate and the valve seat, by reducing the eccentricity between the center surface of the flow channel and the axial surface of the rotating shaft Angle, to reduce friction, or to achieve no friction, to reduce the driving torque, but the existing technology has not made further breakthroughs after the development of the triple eccentric structure, and there are still shortcomings such as large opening and closing torque, unreliable sealing, and short service life.

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