Wedge type double gate plate structure with V-shaped conical surface

Abstract

The invention belongs to the technical field of valves, and particularly relates to a wedge type double gate plate structure with a V-shaped conical surface. The wedge type double gate plate structurecomprises a gate plate A and a gate plate B which are oppositely arranged, a semi-spherical protrusion is arranged on the butt joint surface of the gate plate A, the V-shaped conical surface is arranged on the butt joint surface of the gate plate B, the semi-spherical protrusion is positioned in the V-shaped conical surface, the vertex of the semi-spherical protrusion is located outside the buttjoint surface where the semi-spherical protrusion is located, namely the vertex of the semi-spherical protrusion is higher than the butt joint surface, and the edge of the V-shaped conical surface extends out of the butt joint surface of the gate plate B where the V-shaped conical surface is located. The convex spherical surface of the gate plate A always rolls on the V-shaped concave conical surface of the gate plate B, therefore, on one hand, the phenomenon that the two gate plates do not fit due to the processing size error can be avoided, the friction force between the two gate plates cannot be increased along with the increase of the running time, due to continuous grinding, the spherical surface can tend to be smooth, the friction force between the two gate plates is reduced, the motion of the spherical surface is facilitated, and the phenomenon that the gate plates are clamped can be prevented.

Description

technical field [0001] The invention belongs to the technical field of valves, and in particular relates to a wedge-type double gate structure with a V-shaped conical surface. Background technique [0002] Common spherical connection wedge double ram structure such as figure 1 As shown, the middle of gate A and gate B is processed into a spherical shape, so that gate A and gate B can produce a slight rotation around the spherical surface, thereby compensating for the machining error of the wedge angle and compensating for thermal expansion at high temperature The change of wedge angle caused by cold shrinkage prevents the phenomenon of high temperature jamming. [0003] However, since the diameters of the spherical surfaces of the two rams cannot be completely consistent during processing, they cannot be completely ideally fitted together. Therefore, in practical applications, the non-fit of the two spherical surfaces will cause a larger than expected Friction force, and a...

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Problems solved by technology

[0003] However, since the diameters of the spherical surfaces of the two rams cannot be completely consistent during processing, they cannot be completely ideally fitted together. Therefore, in practical applications, the non-fit of the two spherical surfaces will cause a larger than expected Friction force, and as the running time increases, this friction force continues to increase, and finally makes the spherical surface unable to rotate as expected, resulting in jamming

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