Low-resistance two-way sealing butterfly valve

Abstract

The utility model discloses a low-resistance two-way sealing butterfly valve which comprises a valve body and a valve clack, a strip-shaped groove (8) concaved downwards is formed in the center of the back of the valve clack, the strip-shaped groove is distributed along the central axis of the back of the valve clack to roughly divide the back of the valve clack into two parts, fusiform shaft hole bearing hubs (9) are symmetrically arranged on the two sides of the back of a valve plate, and the fusiform shaft hole bearing hubs (9) are arranged in the valve body. Two rib plates (10) are symmetrically arranged on the front face of the valve plate relative to the central axis. The utility model has the beneficial effects that the vortex core of a valve medium can be effectively controlled, so that the vortex core uniformly forms two large vortexes, the generation of disordered small vortexes is inhibited and eliminated, the flow state is stabilized, and the flow resistance is reduced; when the valve is closed, the evenly-distributed protruding wave-shaped round corners make contact with part of the sealing face of the valve body, under the action of medium pressure, the small protruding round corners deform, the contact width of the small protruding round corners and the sealing face is increased, and the sealing specific pressure is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to butterfly valve especially relates to bidirectional sealing butterfly valve. BACKGROUND

[0002] Butterfly valve is a kind of valve widely used in petroleum, metallurgy, water supply and drainage and other pipeline systems. It is usually composed of valve body, valve clapper, valve shaft, sealing ring, adjusting pressure plate, shaft sleeve and other components, and the external torque is transmitted through the valve shaft to drive the disc-shaped butterfly plate to rotate 90°, and when closed, the sealing ring on the valve clapper contacts the sealing surface of the valve body after adjusting the pressure plate device, and the sealing contact surface is extruded to prevent the medium from passing through. When opened, the sealing ring gradually separates from the sealing surface of the valve body until the valve clapper forms a perpendicular angle with the sealing surface. As a continuous medium, the valve clapper and the valve shaft are always in the pipeline cavity during operation, and the medium cannot be avoided. The scouring of the medium will also cause destructive damage to the valve clapper. At the same time, the thickness of the valve clapper determines the maximum sealing pressure that the butterfly valve can withstand. The higher the sealing pressure, the thicker the valve clapper, but the greater the resistance to the medium. After the fluid passes through the cylindrical obstacle in the pipeline, two vortexes with opposite directions are formed periodically at the tail of the obstacle. The vortexes interfere with each other and attract each other. The formation and dissipation of vortexes are accompanied by changes in energy. If the frequency of vortexes is close to that of the object itself, resonance and even destruction will occur, and the noise produced is unacceptable in the process of production and life. As a complex geometric body, the butterfly plate needs to be shaped properly to reduce the influence of vortex structure after flow. This is a problem that needs to be solved urgently. SUMMARY

[0003] The technical problem to be solved by the utility model is that the existing butterfly valve clapper structure produces two vortexes, and therefore a low-resistance bidirectional sealing butterfly valve is provided.

[0004] The technical scheme of the utility model is as follows: a low-resistance bidirectional sealing butterfly valve, comprising a valve body and a valve clapper, a strip-shaped groove is arranged in the center of the back of the valve clapper and recessed downward, the strip-shaped groove is distributed along the central axis of the back of the valve clapper to divide the back of the valve clapper into two parts, and two shuttle-shaped shaft hole bearing hubs are symmetrically arranged on both sides of the back of the valve clapper. Two rib plates are symmetrically arranged on the front of the valve clapper about the central axis.

[0005] In the above-mentioned scheme, the back of the valve clapper is in the shape of an arc that bulges outward, and the highest point of the arc is in the center of the back of the valve clapper.

[0006] In the above-mentioned scheme, the strip-shaped groove comprises three grooves connected in sequence.

[0007] In the above-mentioned scheme, the two ends of the strip-shaped groove are provided with triangular planes, and the triangular planes are provided with threaded holes.

[0008] The sealing ring is integrally annular, the upper end of the longitudinal section of the annular shape is semicircular arc, the surface of the semicircular arc is uniformly distributed with convex wavy round corners, the lower part of the longitudinal section of the annular shape is an outwardly inclined tangent slope, the bottom of the tangent slope extends outwardly with a stop portion, the stop portion extends downwardly with a side plane, the bottom of the side plane extends inwardly with a bottom slope, and the center of the bottom slope is provided with a U-shaped protrusion.

[0009] The beneficial effect of the utility model is that the vortex core of the medium passing through the valve can be effectively controlled to uniformly form two larger vortexes, the occurrence of small turbulent vortexes is inhibited and eliminated, the flow state is stabilized and the flow resistance is reduced; when the valve is closed, the several uniformly distributed convex wavy round corners are partially in contact with the sealing surface of the valve body, when the medium pressure acts, the convex small round corners will be deformed to increase the contact width with the sealing surface and improve the sealing specific pressure. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is the axial side schematic view of the valve disc in the utility model;

[0011] Figure 2 is the front view and back view of the valve disc in the utility model;

[0012] Figure 3 is the axial side schematic view and cross-sectional view of the sealing ring in the utility model;

[0013] Figure 4 、 Figure 5 、 Figure 6 is the axial side schematic view of the new butterfly valve complete machine of three angles in the utility model;

[0014] In the drawing, 1 is semicircular arc, 2 is wavy round corner, 3 is tangent slope, 4 is stop portion, 5 is side plane, 6 is bottom slope, 7 is U-shaped protrusion, 8 is strip-shaped recess, 9 is shuttle-shaped shaft hole bearing hub, 10 is rib plate, and 11 is triangular plane. DETAILED DESCRIPTION

[0015] The application will be further described below in combination with the drawings.

[0016] A low-resistance bidirectional sealing butterfly valve, comprising a valve body and a valve disc, wherein a strip-shaped recess 8 is arranged in the center of the back of the valve disc and recessed downward, the strip-shaped recess is distributed along the central axis of the back of the valve disc and divides the back of the valve disc into two parts, shuttle-shaped shaft hole bearing hubs 9 are symmetrically arranged on both sides of the back of the valve disc, and two rib plates 10 are symmetrically arranged on the front of the valve disc about the central axis.

[0017] The valve back body is in the shape of a tortoise shell, or an outwardly convex arc, with the highest point of the arc in the center of the valve back. The top of the spindle hole bearing hub is provided with a flat surface for machining the pin hole. The strip-shaped groove edge is streamlined. The two ends of the strip-shaped groove are provided with triangular flats 11, which smoothly transition with the valve back body. The triangular flats are provided with threaded holes for mounting machining fixtures. The valve front is concave, and along the direction of the strip-shaped groove, is provided with two ribs higher than the concave surface, for increasing the structural strength of the valve. The concave outer circle is a stepped surface, and is provided with grooves for mounting sealing rings and uniformly distributed threaded holes for mounting adjusting plates.

[0018] The valve is covered with a sealing ring, which is a circular ring-shaped component. The upper end of the circular ring cross-section is a semicircular arc 1, and along the semicircular arc, several convex wavy round corners 2 are uniformly distributed. The two ends of the semicircular arc are tangent bevels 3, and between the two side planes and the bevels, there are provided stopper portions 4, which extend downwardly with side planes 5, and the bottom of the side planes extend inwardly with bottom bevels 6, and the center of the bottom bevels is provided with a U-shaped protrusion 7. When the valve is closed, the several uniformly distributed convex wavy round corners are in partial contact with the valve body sealing surface. When the medium pressure acts, the convex wavy round corners will deform, so that the contact width with the sealing surface increases, and the sealing specific pressure is improved.

[0019] Those skilled in the art should know that the protection scheme of the present application is not limited to the above-mentioned embodiments, but can be variously arranged, combined and transformed on the basis of the above-mentioned embodiments, and various transformations of the present application without departing from the spirit of the present application all fall within the protection scope of the present application.

Claims

1. A low-resistance bidirectional sealing butterfly valve, comprising: The valve body and valve disc are characterized in that: a downwardly recessed strip groove (8) is provided in the center of the back of the valve disc, the strip groove is distributed along the central axis of the back of the valve disc to roughly divide the back of the valve disc into two parts, a shuttle-shaped shaft hole bearing hub (9) is symmetrically provided on both sides of the back of the valve disc, and two ribs (10) are symmetrically provided on the front of the valve disc about the central axis.

2. The low-resistance bidirectional sealing butterfly valve as described in claim 1, characterized in that: The back of the valve disc is generally convex with an outward arc shape, and the highest point of the arc is at the center of the back of the valve disc.

3. The low-resistance bidirectional sealing butterfly valve as described in claim 1, characterized in that: The strip-shaped groove comprises three groove segments connected in sequence.

4. The low-resistance bidirectional sealing butterfly valve as described in claim 1, characterized in that: The two ends of the strip groove are provided with triangular planes (11), and the triangular planes are provided with threaded holes.

5. A low-resistance bidirectional sealing butterfly valve as described in claim 1, characterized in that: The valve disc is covered with a sealing ring, which is circular in shape. The upper end of the longitudinal section of the circular ring is semi-circular (1), and the surface of the semi-circular ring is evenly covered with raised wavy rounded corners (2). The lower part of the longitudinal section of the circular ring is an outwardly inclined tangent slope (3). The bottom of the tangent slope extends outward to a stop (4), and the stop extends downward to a side plane (5). The bottom of the side plane extends inward to a bottom slope (6), and the center of the bottom slope is provided with a U-shaped protrusion (7).

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