CN204437304U - A kind of butterfly valve seal structure - Google Patents

Abstract

The utility model discloses a sealing structure of a butterfly valve, which belongs to the field of mechanical design. The butterfly valve includes a valve body, a valve stem and a disc plate. The valve body is provided with a circulation pipe, and the disc plate is connected with the valve stem. The disc is arranged in the circulation channel, and it is characterized in that the outer circumference of the disc has an arc-shaped cross section, and the circulation channel of the valve body is also provided with a seal that matches the outer circumference of the disc. The sealing part is made of metal elastic material, the matching surface of the sealing part and the disc plate is arc-shaped, and the sealing part is sealed with the outer periphery of the disc plate through the arc surface. The technical solution of the utility model utilizes the arc surface to cooperate with the sealing structure, which effectively prevents the backflow of the medium, and effectively increases the sealing performance of the disc valve under the condition of reverse pressure.

Description

A butterfly valve sealing structure

technical field

The utility model belongs to the mechanical field and relates to a sealing device, in particular to a sealing structure suitable for a butterfly valve.

Background technique

Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used for switch control of low-pressure pipeline medium. A kind of valve, the valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays the role of cutting and throttling on the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment.

Most of the existing butterfly valves have the following disadvantages:

1. The disc is relatively thick and the flow resistance is relatively large;

2. When it is normally open, the sealing ring is flushing against the medium, which will affect the sealing;

3. When it is reversely sealed, the sealing effect is relatively poor and it is easy to leak.

Utility model content

In view of this, the utility model provides a butterfly valve sealing structure.

In order to achieve the above object, the specific technical scheme is as follows:

A butterfly valve sealing structure, the butterfly valve includes a valve body, a valve stem and a disc plate, the valve body is provided with a flow channel, the disc plate is connected to the valve stem, and the disc plate is arranged on the flow channel Among them, the section of the outer circumference of the disc is arc-shaped, and the flow pipe of the valve body is also provided with a sealing part that matches the outer circumference of the disc, and the sealing part is made of metal elastic material, so The matching surface of the sealing part and the disc plate is arc-shaped, and the sealing part and the outer periphery of the disc plate are sealed through the cooperation of the arc surface.

Preferably, an annular pressure ring is also included, the pressure ring is arranged on one side of the flow pipe of the valve body, and the inner diameter of the pressure ring is equal to or larger than the inner diameter of the flow pipe.

Preferably, the sealing part includes an elastic metal sealing ring with a U-shaped cross section, the sealing ring is arranged in the flow channel, and cooperates with the outer periphery of the disc to seal.

Preferably, one end of the sealing ring is connected to the flow pipe of the valve body, and the other end of the sealing ring is fixed to one side of the valve body through a pressure ring.

Preferably, an actuator is also included, and the actuator is connected with the valve stem.

Preferably, the actuator is a pneumatic, hydraulic or electric actuator.

Compared with the prior art, the technical solution of the utility model uses the arc surface to cooperate with the sealing structure, thereby effectively preventing the backflow of the medium, and effectively increasing the sealing performance of the disc valve under reverse pressure.

Description of drawings

The accompanying drawings constituting a part of the utility model are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the cross-sectional structure schematic diagram of the utility model embodiment;

Fig. 3 is the enlarged structural schematic diagram of the sealing structure of the utility model embodiment;

Fig. 4 is a schematic diagram of the disc structure of the utility model embodiment;

Fig. 5 is a schematic diagram of the structure of the sealing part of the embodiment of the utility model.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Embodiments of the present utility model will be explained in detail below in conjunction with the accompanying drawings.

As shown in FIG. 1 and FIG. 2 , a butterfly valve sealing structure according to an embodiment of the present invention, the butterfly valve includes a valve body 1 , a valve stem 2 and a disc plate 3 . The valve body 1 is provided with a circulation pipeline, the disc plate 3 is connected with the valve stem 2, and the disc plate 3 is arranged in the circulation pipeline.

As shown in Figure 3 and Figure 4, the cross-section of the outer periphery of the disc 3 is arc-shaped, and the flow channel of the valve body 1 is also provided with a sealing part 4 matching the outer periphery of the disc. The sealing part 4 is made of metal elastic material. The mating surface of the sealing part 4 and the dish plate 3 is arc-shaped, and the outer periphery of the sealing part 4 and the dish plate 3 is sealed through the cooperation of the arc surface.

The embodiment of the utility model effectively prevents the backflow of the medium by matching the arc surface with the sealing structure, and effectively increases the sealing performance of the butterfly valve in the prior art under the reverse pressure bearing condition of the butterfly valve.

As shown in FIG. 2 and FIG. 3 , in the embodiment of the present utility model, an annular pressure ring 5 is also included. Also as shown in FIG. 5 , the sealing part 4 includes an elastic metal sealing ring with a U-shaped cross section. One end of the sealing ring is connected to the flow pipe of the valve body 1, and the other end of the sealing ring is fixed on one side of the valve body 1 by a pressure ring 5, preferably the pressure ring 5 is pressed on the valve body 1 by hexagon socket bolts.

And preferably, the inner diameter of the pressure ring 5 is equal to or greater than the inner diameter of the flow pipe, which reduces the fluid resistance.

As shown in Figure 4, in the embodiment of the present utility model, it is preferable that the cross section of the outer circumference of the disc 3 is arc-shaped and inclined towards one side, preferably inclined towards the sealing part 4, and the thickness of the disc 3 is appropriately reduced, so as to Reduce flow resistance.

The butterfly valve sealing structure of the utility model is suitable for double eccentric, triple eccentric butterfly valves, etc., and is suitable for the control of pipeline flow paths. The sealing surface of the outer periphery of the butterfly plate 3 is designed as a spherical structure with a certain oblique cone shape. The sealing portion of the valve body 1 is a U-shaped structure. The sealing between the valve body and the butterfly plate 3 is an arc surface matching sealing structure, and its sealing performance is good, especially in two-way sealing, and it is corrosion-resistant, high-temperature resistant, high-pressure resistant, and has a long service life, effectively preventing the backflow of the medium, and effectively The sealing performance of the butterfly valve in the reverse pressure-bearing condition of the butterfly valve in the prior art is increased.

The specific embodiments of the present invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention shall fall within the scope of the present invention.

Claims (6)

1. A butterfly valve sealing structure, the butterfly valve includes a valve body, a valve stem and a disc plate, the valve body is provided with a flow channel, the disc plate is connected with the valve stem, and the disc plate is located on the In the circulation pipeline, it is characterized in that the cross-section of the outer circumference of the disc is arc-shaped, and the circulation pipeline of the valve body is also provided with a sealing part matched with the outer circumference of the disc, and the sealing part is made of metal Made of elastic material, the matching surface of the sealing part and the disc plate is arc-shaped, and the sealing part is sealed with the outer periphery of the disc plate through the arc surface. 2. The butterfly valve sealing structure according to claim 1, further comprising an annular pressure ring, the pressure ring is arranged on one side of the valve body flow pipe, and the inner diameter of the pressure ring is equal to or greater than the The inner diameter of the flow pipe. 3. The butterfly valve sealing structure according to claim 2, wherein the sealing part comprises an elastic metal sealing ring with a U-shaped cross section, the sealing ring is arranged in the flow pipe, and is connected to the disc plate The outer periphery fits the seal. 4. The butterfly valve sealing structure according to claim 3, wherein one end of the sealing ring is connected to the flow pipe of the valve body, and the other end of the sealing ring is fixed to the valve body of the valve body through a pressure ring. side. 5. The butterfly valve sealing structure according to claim 4, further comprising an actuator, the actuator being connected to the valve rod. 6. The butterfly valve sealing structure according to claim 5, wherein the actuator is a pneumatic, hydraulic or electric actuator.