Butterfly valve

Abstract

The utility model relates to valve technical field discloses a butterfly valve, include: valve body, set up on the valve body, valve rod, pass through the valve body and valve cap, be provided with the dish plate frame on the valve rod, the dish plate frame sets up in the valve body, rotating part, set up in the periphery of valve rod, and the valve rod is connected with the valve body rotation through rotating part, first elastic pre -tension structure, one end of first elastic pre -tension structure is connected with the end surface of rotating part, and the end surface of valve cap is connected with the other end of first elastic pre -tension structure, when the valve rod drives dish plate frame linear movement along the axial direction of valve rod under the external working condition, first elastic pre -tension structure generates first force and second force, and the linear movement direction of first force and dish plate frame is same and acts on the valve cap, and the linear movement direction of second force and dish plate frame is opposite and acts on dish plate frame. The utility model has solved under the external working condition, and the butterfly valve internal part produces axial displacement due to thermal expansion and leads to butterfly valve sealing ring damage, and the problem that the valve occurs internal leakage.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a butterfly valve. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve primarily used for on / off control of media in low-pressure pipelines. Its closing element (the butterfly plate) is disc-shaped, rotating around its axis to open, close, and regulate flow. This valve is suitable for air, water, steam, slurry, oil, liquid metals, radioactive media, and various corrosive fluids, primarily functioning as a shut-off and throttling device in pipelines. The core opening and closing element of the butterfly valve is the disc-shaped butterfly plate, which rotates around its own axis within the valve body, thereby controlling the fluid flow path.

[0003] Existing valves, under high temperature or alternating temperature conditions, such as Figure 4 As shown, the valve stem 5 will undergo axial (Y-axis) deformation. Since the valve stem 5 is fixed to the disc holder 2, and the sealing ring 4 is fixed on the disc holder 2, the axial (Y-axis) deformation of the valve stem 5 will be transmitted to the sealing ring 4, causing the sealing ring 4 to be displaced by force and damaging the sealing surface, thereby causing internal leakage of the valve.

[0004] like Figure 5 As shown, the disc holder 2, rotating component 6, limiting sleeve 16, and valve cover 12 are positioned in axial (Y-axis) contact, which to some extent prevents axial (Y-axis) movement of the valve stem 5. However, considering the tolerance fit between components, the tensile expansion of component materials under high temperature or temperature alternation conditions, and the opening and closing factors of the valve stem 5, a gap h between the limiting sleeve 16 and the valve cover 12 must be reserved in the design, usually with a value of 2~3mm. Therefore, the limiting sleeve 16 is basically unable to effectively limit the axial displacement of the sealing ring 4.

[0005] In summary, under high temperature or alternating temperature conditions, the sealing ring 4 will still be damaged due to displacement caused by force, resulting in internal leakage of the valve. Utility Model Content

[0006] This utility model provides a butterfly valve to solve the problem that under high temperature or alternating temperature conditions, the internal parts of the butterfly valve undergo axial displacement due to thermal expansion, which leads to damage to the sealing ring and internal leakage of the valve.

[0007] This utility model provides a butterfly valve, comprising: a valve body; a valve cover disposed on the valve body; a valve stem passing through the valve body and the valve cover, a disc holder disposed on the valve stem and disposed within the valve body; a rotating component disposed around the valve stem, the valve stem being rotatably connected to the valve body via the rotating component; a first elastic pre-tightening structure, one end of the first elastic pre-tightening structure being connected to the end face of the rotating component, and the other end of the first elastic pre-tightening structure being connected to the end face of the valve cover; when the valve stem drives the disc holder to move linearly along the valve stem axis under external operating conditions, the first elastic pre-tightening structure generates a first force and a second force, the first force being in the same direction as the linear movement of the disc holder and acting on the valve cover, and the second force being in the opposite direction to the linear movement of the disc holder and acting on the disc holder.

[0008] Beneficial effects: Under high temperature or alternating temperature conditions, the valve stem, disc holder, and sealing ring generate axial displacement forces. The first elastic pre-tightening structure generates bidirectional forces under the axial displacement forces, and the second force is opposite to the axial displacement forces of the disc holder, thereby offsetting the axial displacement forces of the disc holder, reducing the damage caused by the axial displacement of the sealing ring, and preventing internal leakage of the valve due to sealing ring damage.

[0009] In one alternative embodiment, the rotating component is a bearing.

[0010] In one optional embodiment, the first elastic preload structure includes: a first limiting sleeve disposed around the valve stem and abutting against the end face of the rotating component; a first spring, with a first end connected to the first limiting sleeve and a second end connected to the valve cover; a gasket disposed between the valve body and the valve cover; and a thrust pad, with one end connected to the second end of the first spring and the other end connected to the gasket. The first elastic preload structure generates a first force that acts on the valve cover through the thrust pad and the gasket, thereby compressing the gasket.

[0011] Beneficial effects: Under high temperature or alternating temperature conditions, the valve stem, disc holder and sealing ring generate axial displacement force. The first elastic pre-tightening structure generates bidirectional force under the axial displacement force. The first force compresses the gasket. The sealing pressure formed after the gasket is compressed compensates for the gasket's sealing and ensures the sealing performance between the valve cover and the valve body.

[0012] In one optional embodiment, a first through hole is provided on the valve body, and a first elastic pre-tightening structure is disposed in the first through hole; a second through hole is provided on the valve cover, and the diameter of the second through hole is smaller than the diameter of the first through hole.

[0013] In one optional embodiment, the butterfly valve further includes a second elastic pre-tightening structure. One end of the second elastic pre-tightening structure is connected to the end face of the rotating member, and the other end of the second elastic pre-tightening structure is elastically connected to the end face of the disc holder. When the valve stem drives the disc holder to move linearly along the valve stem axis under external operating conditions, the second elastic pre-tightening structure generates a third force and a fourth force. The third force is in the same direction as the linear movement of the disc holder and acts on the valve cover through the rotating member and the first elastic pre-tightening structure. The fourth force is opposite to the linear movement of the disc holder and acts on the disc holder.

[0014] Beneficial effects: Under high temperature or alternating temperature conditions, the valve stem, disc holder and sealing ring generate axial displacement force. The second elastic pre-tightening structure generates bidirectional force under the axial displacement force. The fourth force is opposite to the axial displacement force, thereby offsetting the axial displacement force, reducing the damage caused by the axial displacement of the sealing ring, and preventing internal leakage of the valve due to sealing ring damage.

[0015] In one optional embodiment, the second elastic preload structure includes: a second limiting sleeve disposed around the valve stem, the second limiting sleeve being located in the cavity between the disc holder and the valve body, and the second limiting sleeve abutting against the end face of the rotating component; and a second spring, the first end of the second spring being connected to the second limiting sleeve, and the second end of the second spring being connected to the disc holder.

[0016] In one alternative embodiment, a sealing ring is provided on the outer edge of the disc tray, and the sealing ring is fixed to the disc tray by a disc pressure ring.

[0017] In one alternative embodiment, a packing cavity is provided between the upper end of the valve stem and the valve cover, and packing is provided inside the packing cavity.

[0018] Beneficial effect: The sealing pressure formed by the packing after compression ensures the sealing of the valve stem and the valve cover.

[0019] In one alternative embodiment, a gasket ring is provided at the bottom of the packing. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a butterfly valve according to an embodiment of the present utility model; Figure 2 for Figure 1 Enlarged schematic diagram of parts C and D; Figure 3 for Figure 1 Enlarged schematic diagram of parts E and F in the middle; Figure 4 A schematic diagram of the structure of an older type of butterfly valve; Figure 5 for Figure 1 Enlarged schematic diagrams of parts A and B in the diagram.

[0022] Explanation of reference numerals in the attached figures: 1. Valve body; 2. Disc holder; 3. Disc pressure ring; 4. Sealing ring; 5. Valve stem; 6. Rotating component; 7. Washer ring; 8. Packing; 12. Valve cover; 13. Gasket; 14. Stud; 15. Nut; 16. Limiting sleeve; 17. First limiting sleeve; 18. First spring; 19. Thrust pad; 20. Second limiting sleeve; 21. Second spring; 22. First through hole; 23. Second through hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The existing valve seal is mainly divided into two parts: the main seal between the sealing ring 4 and the valve body 1, and the shell seal between the valve body 1 and the valve cover 12, and between the valve stem 5 and the valve cover 12.

[0025] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0026] According to an embodiment of this utility model, a butterfly valve is provided, comprising: a valve body 1, a valve cover 12, a valve stem 5, a rotating component 6, and a first elastic pre-tightening structure. The valve cover 12 is disposed on the valve body 1; the valve stem 5 passes through the valve body 1 and the valve cover 12, and a disc holder 2 is disposed on the valve stem 5, which is located inside the valve body 1; the rotating component 6 is disposed around the valve stem 5, and the valve stem 5 is rotatably connected to the valve body 1 via the rotating component 6; one end of the first elastic pre-tightening structure is connected to the end face of the rotating component 6, and the other end of the first elastic pre-tightening structure is connected to the end face of the valve cover 12; when the valve stem 5 drives the disc holder 2 to move linearly along the axial direction of the valve stem 5 under external operating conditions, the first elastic pre-tightening structure generates a first force and a second force. The first force is in the same direction as the linear movement of the disc holder 2 and acts on the valve cover 12, while the second force is in the opposite direction to the linear movement of the disc holder 2 and acts on the disc holder 2. The external operating conditions are high temperature or alternating temperature conditions.

[0027] Under external operating conditions, the valve stem 5, disc holder 2, and sealing ring 4 generate axial displacement force. The axial displacement force is transmitted to the first elastic pre-tightening structure. The second force generated by the first elastic pre-tightening structure under this force is opposite to the axial displacement force of the disc holder 2, thereby offsetting the axial displacement force of the disc holder 2, reducing the damage caused by the axial displacement of the sealing ring 4, and preventing internal leakage of the valve due to damage to the sealing ring 4.

[0028] In one embodiment, the rotating component 6 is a bearing.

[0029] In one embodiment, a sealing ring 4 is provided on the outer edge of the disc holder 2, and the sealing ring 4 is fixed to the disc holder 2 by the disc pressure ring 3. The valve stem 5 is firmly connected to the disc holder 2. Under the action of the actuator, the valve stem 5 applies torque to the sealing ring 4, causing it to squeeze the valve body 1, thereby achieving the main seal between the sealing ring 4 and the valve body 1.

[0030] In one embodiment, the first elastic preload structure includes a first limiting sleeve 17 and a first spring 18. The first limiting sleeve 17 is disposed around the valve stem 5 and abuts against the end face of the rotating member 6; the first end of the first spring 18 is connected to the first limiting sleeve 17, and the second end of the first spring 18 is connected to the valve cover 12.

[0031] Under external operating conditions, the axial displacement force generated by the valve stem 5, disc holder 2 and sealing ring 4 is transmitted to the first limiting sleeve 17 through the rotating part 6. The first limiting sleeve 17 transmits the force to the first spring 18. Under the action of this force, the first spring 18 is compressed to generate a bidirectional spring force F.

[0032] In one embodiment, the first elastic preload structure further includes a gasket 13 and a thrust pad 19. The gasket 13 is disposed between the valve body 1 and the valve cover 12; one end of the thrust pad 19 is connected to the second end of the first spring 18, and the other end of the thrust pad 19 is connected to the gasket 13; the first elastic preload structure generates a first force that acts on the valve cover 12 through the thrust pad 19 and the gasket 13, causing the gasket 13 to compress. After being compressed, the gasket 13 forms a sealing pressure, ensuring the sealing performance of the valve body 1 and the valve cover 12.

[0033] for Figure 1 In the C and D position structure, the disc holder 2, rotating component 6, first limiting sleeve 17, first spring 18, thrust pad 19, and valve cover 12 are axially (Y-axis) in contact and positioning. Under high temperature or alternating temperature conditions, the valve stem 5 will undergo axial (Y-axis) deformation. Since the valve stem 5 and disc holder 2 are fixed together, and the sealing ring 4 is fixed on the disc holder 2, the axial (Y-axis) deformation of the valve stem 5 will be transmitted to the sealing ring 4. The first elastic preload structure is compressed by the displacement from the rotating component 6, and the first spring 18 generates a double... The spring force F in the positive Y-axis direction can be applied to the valve cover 12 through the thrust pad 19 and the gasket 13, and transmitted to the stud 14 and nut 15. The stud 14 is stretched axially to generate a continuous preload force, which can compensate for the sealing of the gasket 13. The second force F in the negative Y-axis direction can be transmitted to the sealing ring 4 through the first limit sleeve 17, the rotating part 6 and the disc bracket 2, providing it with a reverse second force to prevent the axial movement of the sealing ring 4 and ensure the main seal between the sealing ring 4 and the valve body 1.

[0034] In one embodiment, a first through hole 22 is provided on the valve body 1, and a first elastic pre-tightening structure is provided in the first through hole 22; a second through hole 23 is provided on the valve cover 12, and the diameter of the second through hole 23 is smaller than the diameter of the first through hole 22. Thus, the first elastic pre-tightening structure corresponds to a portion of the end face of the valve cover 12, so that the first elastic pre-tightening structure generates a first force that can act on the valve cover 12 through the end face of the valve cover.

[0035] In one embodiment, the butterfly valve further includes a second elastic pre-tightening structure. One end of the second elastic pre-tightening structure is connected to the end face of the rotating member 6, and the other end of the second elastic pre-tightening structure is elastically connected to the end face of the disc holder 2. When the valve stem 5 drives the disc holder 2 to move linearly along the axial direction of the valve stem 5 under external operating conditions, the second elastic pre-tightening structure generates a third force and a fourth force. The third force is in the same direction as the linear movement of the disc holder 2 and acts on the valve cover 12 through the rotating member 6 and the first elastic pre-tightening structure. The fourth force is opposite to the linear movement of the disc holder 2 and acts on the disc holder 2.

[0036] Under external operating conditions, the valve stem 5, disc holder 2, and sealing ring 4 generate axial displacement force. The axial displacement force is transmitted to the second elastic preload structure. The fourth force generated by the second elastic preload structure under this force is opposite to the axial displacement force of the disc holder 2, thereby offsetting the axial displacement force of the disc holder 2, reducing the damage caused by the axial displacement of the sealing ring 4, and preventing internal leakage of the valve due to damage to the sealing ring 4.

[0037] In one embodiment, the second elastic preload structure includes a second limiting sleeve 20 and a second spring 21. The second limiting sleeve 20 is disposed around the valve stem 5, located in the cavity between the disc holder 2 and the valve body 1, and abuts against the end face of the rotating member 6; the first end of the second spring 21 is connected to the second limiting sleeve 20, and the second end of the second spring 21 is connected to the disc holder 2.

[0038] Under external operating conditions, the axial displacement force generated by the valve stem 5, disc holder 2 and sealing ring 4 is transmitted to the second limiting sleeve 20 through the rotating part 6. The second limiting sleeve 20 transmits the force to the second spring 21. Under the action of this force, the second spring 21 is compressed to generate a bidirectional spring force F.

[0039] The valve stem 5 extends from the valve body 1 along both the Y-axis and -Y-axis directions, respectively. Figure 1 The first elastic preload structure is set at positions C and D respectively. Figure 1 The C-position structure and the D-position structure are arranged symmetrically about the center of the channel. Figure 1 Second elastic preload structures are respectively installed at positions E and F. Figure 1 The E-position structure and the F-position structure are symmetrically arranged about the center of the channel.

[0040] for Figure 1In the E and F position structures, the disc holder 2, the second spring 21, the second limiting sleeve 20, the rotating part 6, the first limiting sleeve 17, the first spring 18, the thrust pad 19, and the valve cover 12 are axially (Y-axis) in contact and positioned. Under high temperature or alternating temperature conditions, the valve stem 5 will undergo axial (Y-axis) deformation. Since the valve stem 5 and the disc holder 2 are fixed together, and the sealing ring 4 is fixed on the disc holder 2, the axial (Y-axis) deformation of the valve stem 5 will be transmitted to the sealing ring 4. The second elastic preload structure is compressed by the displacement from the rotating part 6, and the second spring 21 is compressed. The compression generates a bidirectional spring force F. The third force F in the positive Y-axis direction is transmitted sequentially to the stud 14 and nut 15 through the second limiting sleeve 20, rotating part 6, first limiting sleeve 17, first spring 18, thrust pad 19 and valve cover 12. The stud 14 is stretched axially to generate a continuous preload force, which can compensate for the sealing of the gasket 13. The fourth force F in the negative Y-axis direction is transmitted to the sealing ring 4 through the disc bracket 2, providing it with a reverse compensating force, preventing the axial movement of the sealing ring 4, and ensuring the main seal between the sealing ring 4 and the valve body 1.

[0041] In one embodiment, a packing cavity is provided between the upper end of the valve stem 5 and the valve cover 12, and packing 8 is provided in the packing cavity. A gasket 7 is provided at the bottom of the packing 8, and a packing gland is provided at the open upper end face. The sealing pressure formed by the packing 8 after being compressed under force ensures the sealing of the housing between the valve stem 5 and the valve cover 12.

[0042] More specifically, the first spring 18 is a disc spring. The second spring 21 is a disc spring.

[0043] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A butterfly valve, comprising: Valve body (1); Valve cover (12), the valve cover (12) is disposed on valve body (1); A valve stem (5) passes through the valve body (1) and the valve cover (12). A disc holder (2) is provided on the valve stem (5). The disc holder (2) is located inside the valve body (1). The butterfly valve is characterized in that it further includes: Rotating component (6), the rotating component (6) is disposed around the valve stem (5), and the valve stem (5) is rotatably connected to the valve body (1) through the rotating component (6); The first elastic pre-tightening structure has one end connected to the end face of the rotating part (6) and the other end connected to the end face of the valve cover (12). When the valve stem (5) drives the disc holder (2) to move linearly along the axial direction of the valve stem (5) under external working conditions, the first elastic pre-tightening structure generates a first force and a second force. The first force is in the same direction as the linear movement of the disc holder (2) and acts on the valve cover (12). The second force is opposite to the linear movement of the disc holder (2) and acts on the disc holder (2).

2. A butterfly valve according to claim 1, characterized in that, The rotating component (6) is a bearing.

3. A butterfly valve according to claim 1, characterized in that, The first elastic preload structure includes: The first limiting sleeve (17) is disposed on the periphery of the valve stem (5) and abuts against the end face of the rotating part (6); The first spring (18) has its first end connected to the first limiting sleeve (17) and its second end connected to the valve cover (12).

4. A butterfly valve according to claim 3, characterized in that, The first elastic preload structure further includes: Gasket (13), the gasket (13) is disposed between valve body (1) and valve cover (12); A thrust pad (19) is provided, one end of which is connected to the second end of the first spring (18), and the other end of which is connected to the gasket (13). The first elastic preload structure generates a first force that acts on the valve cover (12) through the thrust pad (19) and the gasket (13) to compress the gasket (13).

5. A butterfly valve according to claim 1, characterized in that, The valve body (1) is provided with a first through hole (22), and a first elastic pre-tightening structure is provided in the first through hole (22); the valve cover (12) is provided with a second through hole (23), and the diameter of the second through hole (23) is smaller than the diameter of the first through hole (22).

6. A butterfly valve according to claim 1, characterized in that, The butterfly valve also includes a second elastic pre-tightening structure. One end of the second elastic pre-tightening structure is connected to the end face of the rotating member (6), and the other end of the second elastic pre-tightening structure is elastically connected to the end face of the disc holder (2). When the valve stem (5) drives the disc holder (2) to move linearly along the axial direction of the valve stem (5) under external working conditions, the second elastic pre-tightening structure generates a third force and a fourth force. The third force is in the same direction as the linear movement of the disc holder (2) and acts on the valve cover (12) through the rotating member (6) and the first elastic pre-tightening structure. The fourth force is opposite to the linear movement of the disc holder (2) and acts on the disc holder (2).

7. A butterfly valve according to claim 6, characterized in that, The second elastic preload structure includes: The second limiting sleeve (20) is disposed on the periphery of the valve stem (5). The second limiting sleeve (20) is located in the cavity between the disc holder (2) and the valve body (1), and the second limiting sleeve (20) abuts against the end face of the rotating part (6). The second spring (21) has its first end connected to the second limiting sleeve (20) and its second end connected to the disc holder (2).

8. A butterfly valve according to claim 1, characterized in that, A sealing ring (4) is provided on the outer edge of the disc holder (2), and the sealing ring (4) is fixed on the disc holder (2) by the disc pressure ring (3).

9. A butterfly valve according to claim 1, characterized in that, A packing cavity is provided between the upper end of the valve stem (5) and the valve cover (12), and packing (8) is provided in the packing cavity.

10. A butterfly valve according to claim 9, characterized in that, A gasket (7) is provided at the bottom of the packing (8).

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