Butterfly valve with bidirectional sealing device

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a butterfly valve with a bidirectional sealing device, which comprises a butterfly valve body, a valve rod is movably mounted in the middle of the butterfly valve body, and a valve plate is arranged at the lower end of the valve rod and positioned inside the butterfly valve body. The bag ball is arranged between the outer side of the valve plate and the outer side of the pressing plate, the sealing ring is arranged on the outer side of the bag ball, and the sealing performance between the sealing ring and the inner wall of the butterfly valve body is higher along with the fact that the borne forward pressure is larger, so that the sealing performance can be improved when the forward pressure is borne, and the elastic valve seat is arranged on the other side of the pressing plate. When the pressing plate is subjected to reverse pressure, the pressing plate deforms and extrudes the elastic valve seat, the outer side face of the elastic valve seat is expanded towards the outer side edge of the pressing plate and abuts against the pressing plate, the larger the reverse pressure borne by the pressing plate is, the larger the deformation degree of the elastic valve seat is, it means that the elastic valve seat abuts against the pressing plate more stably, the abutting area is increased, and the sealing performance is improved accordingly.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, and particularly relates to a butterfly valve with a two-way sealing device. Background Technique

[0002] A butterfly valve is a valve widely used in pipeline systems, mainly used for regulating and controlling the flow of fluids. It has a simple structure, small size, and light weight, and is usually composed of a valve body, a valve plate, a valve shaft, and a driving device. The core component of the butterfly valve is the valve plate, which is like a butterfly wing and rotates around the valve shaft. The rotation angle of the valve plate determines the size of the channel for the fluid to pass through the valve, thereby controlling the flow rate.

[0003] When the valve plate is fully opened, the fluid can flow freely; when the valve plate is closed, the fluid flow is blocked. However, in the traditional sealing structure, a pressing plate is used for fixing the seal. After long-term use, the pressing plate wears, and when the pressing plate is subjected to a positive pressure, gaps are easily generated between the pressing plate and the valve seat, resulting in fluid leakage. Content of the Utility Model

[0004] The purpose of the utility model is to provide a butterfly valve with a two-way sealing device to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A butterfly valve with a two-way sealing device, comprising

[0007] A butterfly valve body, a valve rod is movably installed in the middle of the butterfly valve body, and a valve plate is arranged at the lower end of the valve rod and inside the butterfly valve body;

[0008] A pressing plate is arranged on the front surface of the valve plate, and a sealing mechanism one is arranged between the pressing plate and the outer side of the valve plate;

[0009] A sealing mechanism two is arranged inside the butterfly valve body close to the pressing plate.

[0010] Preferably, the sealing mechanism one includes a clamping groove, the clamping groove is arranged between the pressing plate and the outer side of the valve plate, a bladder ball is annularly arranged inside the clamping groove, and a sealing ring is sleeved on the outer side of the bladder ball;

[0011] Preferably, guide grooves are arranged on both inner walls of the clamping groove close to the sealing ring, and limiting rings matched with the guide grooves are arranged on both sides of the sealing ring;

[0012] Preferably, an O-ring is arranged between the limiting ring and the guide groove outside the sealing ring;

[0013] Preferably, the second sealing mechanism comprises an elastic valve seat, the elastic valve seat is annularly arranged on the inner wall of one side of the butterfly valve body close to the pressure plate, and a pressure ring is annularly arranged on the other side of the elastic valve seat;

[0014] Preferably, the elastic valve seat is made of rubber.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] A butterfly valve with a two-way sealing device, the device arranges a balloon between the outer sides of the valve plate and the pressure plate, and a sealing ring is arranged on the outer side of the balloon. As the positive pressure increases, the sealing performance between the sealing ring and the inner wall of the butterfly valve body becomes higher, so that the sealing performance can be improved when the positive pressure is applied, and an elastic valve seat is arranged on the other side of the pressure plate. When the pressure plate is subjected to reverse pressure, the pressure plate is deformed and squeezes the elastic valve seat, and the outer side surface of the elastic valve seat is also stretched and abutted toward the outer edge of the pressure plate. When the reverse pressure applied to the pressure plate is greater, the deformation degree of the elastic valve seat is greater, which means that the abutment with the pressure plate is more stable, and the abutment area is increased, and the sealing performance is increased accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall main structure of the utility model;

[0018] Figure 2 For the utility model Figure 1 The enlarged schematic diagram at A in the middle;

[0019] Figure 3 For the utility model Figure 1 Enlarged schematic diagram of point B in the middle.

[0020] In the figure: 1. Butterfly valve body; 2. Valve stem; 3. Valve plate; 4. Pressure plate; 5. Clamp groove; 6. Ball; 7. Sealing ring; 8. Guide groove; 9. Limiting ring; 10. O-ring; 11. Elastic valve seat; 12. Pressure ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figures 1-3 As shown, a technical solution provided by the utility model:

[0023] A butterfly valve with a two-way sealing device, comprising a butterfly valve body 1, a valve stem 2 is movably installed in the middle of the butterfly valve body 1, and a valve plate 3 is arranged at the lower end of the valve stem 2 and inside the butterfly valve body 1; a pressing plate 4 is arranged on the front surface of the valve plate 3, and a first sealing mechanism is arranged between the pressing plate 4 and the outer side of the valve plate 3; a second sealing mechanism is arranged inside the butterfly valve body 1 close to the pressing plate 4; the first sealing mechanism includes a clamping groove 5, a clamping groove 5 is arranged between the pressing plate 4 and the outer side of the valve plate 3, a bladder ball 6 is annularly arranged inside the clamping groove 5, and a sealing ring 7 is sleeved outside the bladder ball 6; guide grooves 8 are arranged on both inner walls of the clamping groove 5 close to the sealing ring 7, and limiting rings 9 matched with the guide grooves 8 are arranged on both sides of the sealing ring 7; an O-ring 10 is arranged between the limiting ring 9 and the guide groove 8 outside the sealing ring 7; the second sealing mechanism includes an elastic valve seat 11, an elastic valve seat 11 is annularly arranged on the inner wall of the butterfly valve body 1 close to the pressing plate 4, the elastic valve seat 11 is made of rubber material, and a pressing ring 12 is annularly arranged on the other side of the elastic valve seat 11;

[0024] In this embodiment, when the pressing plate 4 is subjected to a positive pressure, the pressing ring 12 will also deform and squeeze the elastic valve seat 11. After being pressed, the outer side of the elastic valve seat 11 expands towards the outer edge of the pressing plate 4 and abuts against the edge of the pressing plate 4. Moreover, the pressing plate 4 will squeeze the bladder ball 6 inside the clamping groove 5, and the bladder ball 6 is pressed to push the sealing ring 7 outwards, so that the front end face of the sealing ring 7 abuts against the inner wall of the butterfly valve body 1. The greater the positive pressure received, the higher the sealing performance between the sealing ring 7 and the inner wall of the butterfly valve body 1. In this way, the sealing performance can be improved when receiving a positive pressure. When the pressing plate 4 is subjected to a negative pressure, the pressing plate 4 deforms and squeezes the elastic valve seat 11, and the outer side of the elastic valve seat 11 also expands towards the outer edge of the pressing plate 4 and abuts. The greater the negative pressure received by the pressing plate 4, the greater the deformation degree of the elastic valve seat 11, which means that it abuts against the pressing plate 4 more stably, and the abutting area increases, and the sealing performance increases accordingly.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions in the specification are only preferred examples of the present invention and do not limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A butterfly valve with a bidirectional sealing device, characterized in that: include A butterfly valve body (1), a valve stem (2) being movably mounted in the middle of the butterfly valve body (1), and a valve plate (3) being arranged at the lower end of the valve stem (2) and located inside the butterfly valve body (1); A pressure plate (4) is arranged on the front side of the valve plate (3), and a sealing mechanism 1 is arranged on the outer side of the pressure plate (4) and the valve plate (3); A second sealing mechanism is provided inside the butterfly valve body (1) on a side close to the pressure plate (4).

2. A butterfly valve with a bidirectional sealing device according to claim 1, characterized in that: The sealing mechanism 1 comprises a clamping groove (5), the clamping groove (5) being arranged between the outer sides of the pressure plate (4) and the valve plate (3), a capsule ball (6) being arranged in an annular shape inside the clamping groove (5), and a sealing ring (7) being sleeved on the outer side of the capsule ball (6).

3. A butterfly valve with a bidirectional sealing device according to claim 2, characterized in that: Guide grooves (8) are provided on both inner walls of the clamping groove (5) close to the sealing ring (7), and limiting rings (9) matching the guide grooves (8) are provided on both sides of the sealing ring (7).

4. A butterfly valve with a bidirectional sealing device according to claim 3, characterized in that: An O-ring (10) is provided between the limiting ring (9) and the guide groove (8) located outside the sealing ring (7).

5. The butterfly valve with a bidirectional sealing device according to claim 1, characterized in that: The second sealing mechanism comprises an elastic valve seat (11), the elastic valve seat (11) being arranged in an annular manner on the inner wall of one side of the butterfly valve body (1) close to the pressure plate (4), and a pressure ring (12) being arranged in an annular manner on the other side of the elastic valve seat (11).

6. A butterfly valve with a bidirectional sealing device according to claim 5, characterized in that: The elastic valve seat (11) is made of rubber.

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