CN210687019U - Two-way hard sealing butterfly valve - Google Patents

Abstract

The utility model relates to the technical field of valves, a two-way butterfly valve sealed firmly is disclosed, including valve body and valve shaft, movable disk seat that has conical surface structure through the pressure equipment of valve body clamping ring in the valve body, the valve body inner wall has concave yield stair structure, stair structure includes horizontal surface and vertical surface, movable disk seat outer wall have with the horizontal ladder face and the vertical ladder face of valve body stair structure adaptation, the laminating of horizontal ladder face and the horizontal surface of valve body stair structure, vertical ladder face has the clearance with stair structure's vertical surface, the butterfly plate passes through the metal seal circle with movable disk seat conical surface and seals, the butterfly plate passes through the connecting piece and is fixed and rotatory along with the valve shaft, the bearing is established with valve body friction position to the valve shaft, bearing department. The butterfly valve seat is in a form of automatically adjusting and moving through hydraulic power, the sealing effect can be guaranteed when the butterfly plate bears the pressure in the forward direction and the reverse direction, and when the butterfly plate bears the pressure in the reverse direction, the hydraulic power pushes the valve seat to move leftwards to be in close contact with the metal sealing ring and the rubber soft sealing ring at the butterfly plate to realize reverse sealing.

Description

Two-way hard sealing butterfly valve

technical field

The utility model relates to the technical field of valves, in particular to a bidirectional hard sealing butterfly valve.

Background technique

Ordinary metal hard sealing butterfly valve, the disc sealing geometry adopts cone or spherical shape, the disc sealing ring is deformed by radial compression and the thrust of the positive medium, so that the disc sealing ring and the valve seat form a wedge effect, so as to realize the positive seal.

However, when the medium flows in the reverse direction, the butterfly plate sealing ring will tend to be separated from the sealing valve seat due to the thrust of the medium, which will eventually lead to poor reverse sealing effect of the butterfly valve. Therefore, this ordinary butterfly valve is only suitable for one-way sealing conditions. .

At present, few domestic butterfly valves can achieve two-way sealing, especially under high pressure conditions, the reverse sealing effect is not satisfactory. Some of the existing two-way sealing butterfly valves use rubber soft sealing structure, that is, by adding rubber sealing The compression amount of the ring can achieve reverse sealing, but this sealing effect is not lasting, and the sealing ring is fragile and not durable, and it is impossible to achieve reverse sealing under high pressure; in addition, there are also butterfly valves with triple eccentric hard sealing structure, but It has been proved by many feedbacks that it is not effective in high pressure reverse sealing.

SUMMARY OF THE INVENTION

The technical problem solved by the utility model is to overcome the defects of the prior art and provide a bidirectional hard sealing butterfly valve which can achieve bidirectional equal pressure sealing and zero leakage.

The purpose of the present utility model is achieved through the following technical solutions:

A two-way hard-sealed butterfly valve includes a valve body and a valve shaft. A movable valve seat with a conical surface structure is press-fitted in the valve body through a valve body pressure ring. The inner wall of the valve body has a concave step structure, and the stepped structure includes a lateral surface. and the vertical surface, the outer wall of the movable valve seat has a lateral stepped surface and a vertical stepped surface that are adapted to the stepped structure on the valve body, the lateral stepped surface is fitted with the lateral surface of the stepped structure of the valve body, and the vertical stepped surface is compatible with the stepped structure. There is a gap on the vertical surface of the butterfly plate, the conical surface of the butterfly plate and the movable valve seat are sealed by a metal sealing ring, the butterfly plate and the valve shaft are fixedly connected by a pin, the butterfly plate rotates with the valve shaft, and the friction part between the valve shaft and the valve body is set. There is a bearing, and the bearing is provided with a packing package.

Further, a rubber soft sealing ring is installed at the sealing part of the metal sealing ring. The rubber soft sealing ring is located at the small diameter end of the conical surface of the movable valve seat, and the rubber soft sealing ring is press-fitted on the metal sealing ring through the pressure plate and the butterfly plate pressure ring A double seal is formed.

Furthermore, the butterfly plate pressing ring is also provided with a set screw to abut against the pressing plate, so as to adjust the sealing degree of the rubber soft sealing ring.

Further, the bearing is made of high-strength brass and graphite.

Further, the packing adopts pressure self-sealing V-shaped combined sealing ring.

Further, the valve shaft is an integral valve shaft passing through the butterfly plate.

Compared with the prior art, the utility model has the following beneficial effects:

The butterfly valve creatively designs the valve seat in a form that can be automatically adjusted and moved by hydraulic power, which can ensure the sealing effect in both forward and reverse pressure bearing. It is in close contact with the metal sealing ring and rubber soft sealing ring at the butterfly plate to realize reverse sealing.

The sealing ring at the butterfly plate is a combination of metal hard sealing ring and rubber soft sealing ring. The metal hard seal is the main seal, and the rubber soft seal is the auxiliary seal. The rubber soft seal can be adjusted by the set screw to further strengthen the sealing effect. .

After testing, the butterfly valve of the present application can realize two-way equal pressure sealing and achieve zero leakage sealing effect, which completely solves the technical problem that the butterfly valve was difficult to achieve reverse sealing in the past. A major technological breakthrough.

Description of drawings

FIG. 1 is a partial structural schematic diagram of the bidirectional hard-sealed butterfly valve described in Embodiment 1. FIG.

Detailed ways

The present utility model will be further described below in conjunction with the specific embodiments, wherein, the accompanying drawings are only used for exemplary description, and what is shown is only a schematic diagram, not a physical drawing, and should not be construed as a limitation on the present patent; in order to better illustrate the present utility model In the new embodiment, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

Example 1

As shown in Figure 1, a bidirectional hard-sealed butterfly valve is provided, which includes a valve body 1 and a valve shaft (not shown), the valve body is a double eccentric structure, and the inner cavity of the valve body 1 is press-fitted with a The movable valve seat 3 with all stainless steel conical surface structure, the valve body 1 has a concave step structure on the inner wall where the movable valve seat 3 is installed, the step structure includes a lateral surface 11 and a vertical surface 12, the movable valve seat 3 The outer wall has a horizontal stepped surface 31 and a vertical stepped surface 32 that are adapted to the stepped structure on the valve body. The surface 12 has a gap, the butterfly plate 4 and the conical surface 33 of the movable valve seat are sealed by the metal sealing ring 5, the butterfly plate and the valve shaft are fixedly connected as a whole by a pin, the butterfly plate rotates with the valve shaft, and the friction part between the valve shaft and the valve body Bearings are provided, and packings are provided at the bearings.

The two-way hard-sealed butterfly valve of this embodiment is realized by reserving a gap between the vertical stepped surface of the movable valve seat and the vertical surface of the stepped structure, so that the movable valve seat moves in the reverse direction when the medium reversely flows in the butterfly valve. Reverse sealing is possible, in which the movable valve seat does not need manual operation control, etc., it is completely self-adjusting and moving according to the flow of the medium, and has strong self-adjustment, which can play an excellent reverse sealing effect.

In order to further strengthen the reverse sealing effect, a rubber soft sealing ring 6 is also installed at the sealing part of the metal sealing ring 5. The rubber soft sealing ring 6 is located at the small diameter end of the conical surface of the movable valve seat, and the rubber soft sealing ring 6 is pressed by the pressure plate 7. It is installed at the metal sealing ring to form a double seal, and the periphery of the pressure plate 7 is fixed in position by the butterfly plate pressure ring 8.

Specifically, the rubber soft sealing ring 6 and the metal sealing ring 5 should have a staggered embedded structure, that is, the rubber soft sealing ring 6 is provided with a convex part 61 at the end contacting with the metal sealing ring, and the metal sealing ring 5 is at the corresponding position of the convex part The concave part is adapted to the convex part, so that the two sealing rings are interdependent, and problems such as movement and dislocation will not easily occur.

In addition, the butterfly plate pressing ring 8 is also provided with a set screw 9 to abut against the pressing plate 7, so as to adjust the sealing degree of the rubber soft sealing ring. The sealing effect can be continuously ensured by tightening the screw 9. Of course, when the wear reaches a certain level, the butterfly plate pressing ring 8 and the pressing plate 7 can be removed to replace the rubber soft sealing ring 6.

In this embodiment, the bearing at the connection between the butterfly plate and the valve shaft is made of high-strength brass and graphite, which has a small friction coefficient and does not require oil injection and lubrication under long-term working conditions.

The packing adopts pressure self-sealing V-shaped combined sealing ring. The higher the pressure in the working state, the better the sealing effect.

Common butterfly valves on the market all use segmented valve shafts. The valve shaft in this embodiment is an integral valve shaft that penetrates the butterfly plate. It will produce the phenomenon of pressure deflection and internal planting, which is very beneficial to improve the reverse sealing effect of the butterfly valve.

When the butterfly plate is under reverse pressure, the hydraulic force will push the movable valve seat to move to the left, and it is in close contact with the metal sealing ring and the rubber soft sealing ring to achieve excellent reverse sealing. The movement of the movable valve seat in this embodiment is self-regulated by hydraulic power, and the sealing effect can be ensured in both forward and reverse pressure bearing. A large number of test results have proved that the butterfly valve of this embodiment achieves a good effect of zero leakage under the condition of two-way equal pressure (pressure ratio is 1:1). The application of this sealing structure completely solves the technical problem that the butterfly valve was difficult to achieve reverse sealing in the past, especially for the butterfly valve with high pressure such as 4.0MPa, it is a major technological breakthrough.

At present, the bidirectional hard-sealed butterfly valve of this embodiment has been successfully applied in the Donglei pumping station project, and the effect is good.

Obviously, the above-mentioned embodiments are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims (6)

1. The utility model provides a two-way butterfly valve sealed firmly, including valve body and valve shaft, a serial communication port, movable valve seat that has conical surface structure is equipped with through the valve body clamping ring pressure in the valve body, the stair structure of concave yield has on the valve body inner wall, stair structure includes horizontal surface and vertical surface, movable valve seat outer wall have with the valve body on the horizontal ladder face and the vertical ladder face of stair structure adaptation, the laminating of horizontal ladder face and the horizontal surface of valve body stair structure, vertical ladder face has the clearance with stair structure's vertical surface, the butterfly plate passes through the metal seal circle with movable valve seat's conical surface and seals, the butterfly plate passes through the connecting piece and is fixed and rotatory along with the valve shaft, the bearing is established with valve body friction position to the valve.

2. The bidirectional hard seal butterfly valve according to claim 1, wherein a soft rubber seal is further provided at the seal of the metal seal ring, the soft rubber seal is located at the small-caliber end of the conical surface of the movable valve seat, and the soft rubber seal is press-fitted at the metal seal ring through the pressing plate and the pressing ring of the butterfly plate to form a double seal.

3. The bidirectional hard seal butterfly valve of claim 2, wherein the butterfly plate pressing ring is further provided with a set screw for abutting against the pressing plate so as to adjust the tightness of the rubber soft seal ring.

4. The bidirectional hard seal butterfly valve of claim 1, wherein the bearing is made of high-force brass plus graphite.

5. The bidirectional hard seal butterfly valve of claim 1, wherein the packing is a pressure self-sealing V-shaped combination seal ring.

6. The bidirectional hard seal butterfly valve of claim 1 wherein the valve shaft is a unitary valve shaft extending through the butterfly plate.

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