CN203670827U - An inclined full sealing surface seat butterfly valve - Google Patents

Abstract

The utility model discloses a butterfly valve with an inclined full-sealing surface valve seat, which comprises a valve seat, a valve rod and a butterfly plate; the valve rod is connected with the valve seat, and the axis of the valve rod is superposed with the rotation line of the butterfly plate; a sealing surface is arranged around the inner surface of the valve seat, and the sealing surface is in matched contact with the edge of the butterfly plate to realize butterfly valve sealing; the edge of the butterfly valve is an annular part spherical surface, and is continuous and equal in width; the sealing surface is an annular part spherical surface which is continuous and has the same width, and a circular surface formed by the surrounding of the annular sealing surface is inclined to a rotation line of the butterfly plate, so that the sealing surface does not pass through the joint of the valve seat and the valve rod.

Description

An inclined full sealing surface seat butterfly valve

technical field

The utility model relates to a mechanical sealing mechanism, in particular to a valve seat butterfly valve with an inclined full sealing surface.

Background technique

The butterfly valve includes a valve seat and a butterfly plate. The butterfly plate is a disc-shaped plate that rotates around a valve stem in the valve seat to realize the opening and closing of the valve. The edge of the butterfly plate is in sealing contact with the valve seat in the closed state, and the surface of the valve seat that is in sealing contact with the butterfly plate is the sealing surface.

In the butterfly valve of the prior art, as shown in Figure 1, the butterfly plate 1 is connected to the valve seat 3 through the valve stem, the valve stem passes through the sealing surface 3 of the valve seat, and the butterfly plate 1 rotates around the valve stem, so the valve stem must pass through the valve seat. The sealing surface 3 of the seat, the sealing surface 3 is interrupted at the valve stem, so that the connection between the valve stem and the sealing surface 3 becomes the weak point of the butterfly valve seal. In order to prevent leakage at the joint between the valve stem and the sealing surface, the general treatment method is to expand the area of the sealing surface connected to the valve stem and the area of the edge of the butterfly plate connected to the valve stem, or to increase the sealing interference here. All these methods will inevitably lead to the increase of torque, the increase of valve seat wear and the shortening of service life.

Utility model content

In view of this, the purpose of this utility model is to propose a valve seat butterfly valve with an inclined full sealing surface. The butterfly valve has good sealing performance and long service life.

Based on the above purpose, the utility model provides an inclined full sealing surface valve seat butterfly valve, including a valve seat, a valve stem, and a butterfly plate; the valve stem is connected to the valve seat, and its axis coincides with the rotation line of the butterfly plate; The surface is provided with a sealing surface, and the sealing surface cooperates with the edge of the butterfly plate to realize the sealing of the butterfly valve; the edge of the butterfly valve is an annular part spherical surface, continuous and equal in width; the sealing surface is an annular part spherical surface, continuous and equal in width, so The circular surface formed by the annular sealing surface is inclined to the rotation line of the butterfly plate so that the sealing surface does not pass through the connection between the valve seat and the valve stem.

Optionally, the spherical radius of the sealing surface of the valve seat is smaller than the spherical radius of the edge of the butterfly plate.

Optionally, in a sealed state, the butterfly plate forms an included angle with its rotation line, so that the sealing surface that matches the edge of the butterfly plate is a continuous partial spherical surface of equal width.

Optionally, a sealing protrusion is provided on the inner surface of the surrounding valve seat; the sealing surface is arranged on the sealing protrusion.

Optionally, transition chamfers surrounding the inner surface of the valve seat are provided on both sides of the sealing surface; the transition chamfers are partially cylindrical or partially conical.

Optionally, the chamfered surface is continuous or discontinuous.

Optionally, the sealing surface is an elastic sealing surface.

Optionally, the front and back of the butterfly plate are provided with valve stem connecting holes, which are respectively located at both ends of a diameter of the butterfly plate, and the axis of the valve stem connecting hole coincides with the turning line of the butterfly plate; the valve stem is provided with two Or one of them is firmly connected with the butterfly plate through the connecting hole of the valve stem.

It can be seen from the above that the inclined full sealing surface valve seat butterfly valve provided by the utility model designs the sealing surface of the butterfly valve and the edge of the butterfly plate into a special shape, thereby forming a gap between the valve body, the valve seat and the disc plate. Complete, continuous and effective self-tightening sealing pair. Under the effect of the pressure difference between the inlet and outlet of the butterfly valve, the sealing surface of the elastic valve seat is forced to move in the direction that is conducive to sealing. Within the designed working pressure range, the greater the pressure difference between the inlet and outlet of the butterfly valve, the better the sealing effect. The butterfly valve can be directly installed at the end of the pipeline as an emptying valve or a vacuum valve, which solves the problem that the butterfly valve is not suitable for use as an emptying valve.

Description of drawings

Fig. 1 is the structural representation of the butterfly valve of prior art;

Fig. 2 is a half-sectional schematic diagram of the structure of a seated butterfly valve with an inclined full sealing surface according to an embodiment of the utility model;

Fig. 3 is a partial cross-sectional view in another direction of the inclined full sealing surface valve seat butterfly valve of the utility model embodiment;

Fig. 4 is a schematic diagram of an overall half-section structure of a seated butterfly valve with an inclined full sealing surface according to an embodiment of the utility model.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of a butterfly valve with an inclined full sealing surface seat according to an embodiment of the present invention. Including a butterfly plate 21, a valve seat 22, and a valve stem 24, the sealing surface 23 on the valve seat 22 is in contact with the butterfly plate 21 to realize sealing of the butterfly valve. In this embodiment, the butterfly plate 21 still rotates around the valve stem 24 to realize the opening of the butterfly valve. close. Wherein, the axis of the valve stem 24 coincides with the line of revolution of the butterfly plate 21, and the circular surface formed by the sealing surface 23 forms an included angle with the valve stem 24. In this embodiment, the included angle should be set within an appropriate range so that The joint between the valve stem 24 and the valve seat 22 does not pass through the sealing surface 23 .

In the above embodiment, the sealing surface 23 is an annular part spherical surface, continuous and equal in width. The spherical surface refers to the trajectory of a moving point with a fixed distance from a certain point in space, and satisfies the equation x ² +y in the space rectangular coordinate system ² +z ² =R ² , where R is the radius of the sphere. Correspondingly, the edge of the butterfly plate 21 is a partial spherical surface matched with the sealing surface. Preferably, the spherical radius of the edge of the butterfly plate 21 is equal to the radius of the butterfly plate 21 . Preferably, the spherical radius of the sealing surface 23 is slightly smaller than the spherical radius of the edge of the butterfly plate 21 , so that there is an interference fit between the sealing surface and the edge of the butterfly plate and the sealing surface 23 .

In the above-mentioned embodiments, the sealing surface 23 and the valve stem 24 form an included angle, which means that the butterfly plate 21 deflects around the diameter perpendicular to the valve stem 24 in the sealed state, so that the sealing surface 23 deflects accordingly, and the resulting sealing surface 23 Angle with valve stem 24.

In the above embodiment, the sealing surface of the butterfly valve edge and the matching valve seat is set as a spherical surface, which greatly improves the sealing efficiency of the butterfly plate and the valve seat. When the thickness of the butterfly plate is set, the gap between the butterfly plate and the valve seat A better sealing effect can be achieved without setting too much sealing interference. At the same time, the connection between the valve stem and the valve seat does not pass through the sealing surface, so that a continuous and uninterrupted sealing surface is formed on the valve seat, so that the sealing pressure between the butterfly plate and the valve seat is uniform in the sealed state, making the butterfly valve The opening and closing torque is approximately linear, which reduces the maximum safe torque output value of the opening and closing butterfly valve, reduces the torque requirement of the opening and closing butterfly valve, thereby reducing the cost of using the butterfly valve; the continuous sealing surface of the valve seat makes the butterfly valve easier to vulcanize and form. .

In some embodiments, the sealing surface is an elastic sealing surface.

Fig. 3 is a cross-sectional view in another direction of the inclined full sealing surface seat butterfly valve of the embodiment of the utility model, and the view direction of Fig. 3 is perpendicular to the view direction of Fig. 2 . As shown in Figure 3, a sealing protrusion 25 is provided around the inner wall of the valve seat 22, and the sealing surface 23 is arranged on the inner surface of the sealing protrusion 25. The circular surface surrounded by the sealing surface 23 forms an angle of α° with the rotation line of the butterfly plate. . The edge of the butterfly plate 21 is in contact with the sealing surface 23 provided on the sealing protrusion 25 in a sealed state. Further, the sealing protrusion 25 is also provided with a transitional chamfering surface 26 surrounding both sides of the sealing surface 23, and the transitional chamfering surface 26 terminates at the junction with the valve stem. The transitional chamfered surface 26 is a partial conical surface or cylindrical surface, so that the butterfly plate rotates around the rotation line during the process of closing the butterfly valve, reaches the transitional chamfered surface 26 , and then contacts the sealing surface 23 .

In some embodiments, the included angle between the sealing surface and the valve stem can also be increased to ensure that the transition chamfered surfaces on both sides of the sealing surface are continuous conical surfaces or cylindrical surfaces.

In various embodiments of the present invention, the partial spherical surface is preferably an annular curved surface of equal width obtained by intercepting the spherical surface by two parallel planes whose distance is smaller than the diameter of the spherical surface. The partial spherical surface may also be an annular curved surface of non-equal width obtained by intercepting the spherical surface by two non-parallel planes.

In various embodiments of the present utility model, the partial conical surface is preferably an annular curved surface of equal width obtained by intercepting the conical surface by two parallel planes whose distance is less than the height of the conical surface. The partial conical surface may also be an annular curved surface of non-equal width obtained by intercepting the conical surface by two non-parallel planes.

In various embodiments of the present utility model, the partial cylindrical surface is preferably an annular curved surface of equal width obtained by cutting the cylindrical surface with two parallel planes whose distance is less than the height of the cylindrical surface. The partial cylindrical surface may also be an annular curved surface of non-equal width obtained by intercepting the cylindrical surface by two non-parallel planes.

Fig. 4 is an overall half-sectional view of the inclined full sealing surface valve seat butterfly valve according to the embodiment of the utility model. Both sides of the butterfly plate 21 are respectively provided with valve stem connecting holes 27, which are located at both ends of a diameter of the butterfly plate 21. The hole axis of the valve stem connecting hole 27 forms an included angle with the butterfly plate 21 and is symmetrical about the geometric center of the butterfly plate. There are two valve stems 24, which are arranged in the middle of the inner surface of the valve seat, at the same position as the existing valve stems, and are fastened to the valve stem connecting hole 27 by mechanical fasteners. In the assembled state, the sealing protrusion 25 surrounds the cylindrical surface of the inner surface of the valve seat and is symmetrical about the geometric center of the butterfly plate.

In some other embodiments, the valve stem can be connected with the butterfly plate through other structures.

Since the sealing surface of the inclined full-seat butterfly valve provided by the embodiment of the utility model does not pass through the valve stem, there is no discontinuity at the valve stem, so the valve stem and the valve seat are allowed to be fixed in a non-sealing manner. When the edge of the butterfly plate leaves the sealing surface, theoretically the torque of the valve stem is only the torque caused by the friction between the valve stem and the valve stem seal and the valve stem and the bushing, so the torque after the butterfly valve is opened is very small. Stable torque, which reduces the wear between the edge of the butterfly plate and the sealing surface, and increases the stability and life of the sealing pair formed by the edge of the butterfly plate and the sealing surface; There is no need for interference fit between them, the rotational friction of the valve stem is reduced, so the torque to open the butterfly valve is also significantly reduced, and the opening and closing device of the butterfly valve can work in the state of low power and low torque output. Work, but also help to reduce energy consumption.

In addition, because the radius of the spherical surface of the sealing surface of the inclined full-sealing butterfly valve in the embodiment of the utility model is slightly smaller than the spherical radius of the edge of the butterfly plate, and at the same time the edge of the butterfly plate and the sealing surface have a certain width, when the butterfly valve is used in the initial stage, in the sealing state Next, only a part of the sealing surface is in interference fit contact with the edge of the butterfly plate. When the part of the sealing surface in contact with the edge of the butterfly plate is worn to a certain extent, the edge of the butterfly plate can further contact the unworn part of the sealing surface. Butterfly valve life is doubled.

It can be seen from the above that the utility model designs the sealing surface of the butterfly valve and the edge of the butterfly plate into a special shape, thereby forming a complete, continuous and effective self-tightening pair in the valve body, between the valve seat and the disc plate. Under the effect of the pressure difference between the inlet and outlet of the butterfly valve, the sealing surface of the elastic valve seat is forced to move in the direction that is conducive to sealing. Within the designed working pressure range, the greater the pressure difference between the inlet and outlet of the butterfly valve, the better the sealing effect. The butterfly valve can be directly installed at the end of the pipeline as an exhaust valve or a vacuum valve, which solves the problem that the butterfly valve is not suitable for use as an exhaust valve.

Those of ordinary skill in the art should understand that: the above descriptions are only specific embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications made within the spirit and principles of the present utility model, equivalent Replacement, improvement, etc. should all be included in the protection scope of the present utility model.

Claims (9)

1. a hermetically sealed valve seat butterfly valve of inclination, comprises valve seat, valve rod, butterfly plate; Described valve rod is connected with valve seat, and its axis overlaps with the turning spur of butterfly plate; Be provided with sealing surface around valve seat interior surface, sealing face contacts and realizes butterfly valve seal with butterfly plate edge mate; It is characterized in that, described butterfly valve edge is annulus sphere, continuous and wide; Described sealing surface is annulus sphere, continuous and wide, and the turning spur that described annular sealing surface favours butterfly plate around the disc forming makes sealing surface without described valve seat and valve rod joint.

2. hermetically sealed valve seat butterfly valve of inclination according to claim 1, is characterized in that, the spherical radius of described sealing surface is less than the spherical radius at butterfly valve edge.

3. hermetically sealed valve seat butterfly valve of inclination according to claim 1, is characterized in that, under sealing state, butterfly plate and its turning spur form angle, thus with the sealing surface of butterfly plate edge mate be wide continuously spherical calotte.

4. hermetically sealed valve seat butterfly valve of inclination according to claim 3, is characterized in that within the scope of sealing surface, and dish version and valve seat can form the sealing of continuous effective.

5. hermetically sealed valve seat butterfly valve of inclination according to claim 1, is characterized in that, is provided with seal convexity around described valve seat interior surface; Described sealing surface is arranged in sealing projection.

6. hermetically sealed valve seat butterfly valve of inclination according to claim 5, is characterized in that, described sealing surface both sides are provided with the transition chamfer surface around described valve seat interior surface; Described transition chamfer surface is part cylndrical surface or part conical surface.

7. hermetically sealed valve seat butterfly valve of inclination according to claim 6, is characterized in that, described chamfer surface is continuous or discontinuous.

8. hermetically sealed valve seat butterfly valve of inclination according to claim 1, is characterized in that, described sealing surface is resilient seal surface.

9. hermetically sealed valve seat butterfly valve of inclination according to claim 1, is characterized in that, described butterfly plate positive and negative is provided with valve rod attachment hole, lays respectively at the two ends of a diameter of butterfly plate, and the axis of valve rod attachment hole can overlap by turning spur with butterfly plate; Described valve rod is provided with two or one, is fastenedly connected by valve rod attachment hole and butterfly plate.

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