A low-leakage, high-temperature butterfly valve

Abstract

The present invention discloses a low-leakage, high-temperature butterfly valve in the field of butterfly valve technology, comprising an upper valve stem, a valve seat, a butterfly plate, a valve body and a lower valve stem, wherein the upper valve stem passes through the interior of the valve body, and the bracket is sleeved into the upper valve stem and fixed to the valve body by bolts; the lower valve stem passes through the valve body and is mounted on the butterfly plate, and the bracket and the bottom cover are respectively mounted on the upper and lower parts of the valve body, and the packing pressure plate is mounted on the bracket by studs, and the packing pressure plate fixes the packing pad, packing and packing sleeve, and a disc spring is arranged between the stud and the bracket for realizing automatic compensation after the packing is consumed, thereby ensuring the upper sealing. The present invention arranges a disc spring when the stud and the bracket are installed, and the disc spring has good elasticity, and can realize automatic compensation after the packing is consumed during use, thereby ensuring the upper sealing and extending the service life of the high-temperature butterfly valve.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, in particular to a low-leakage, high-temperature butterfly valve. Background Art

[0002] With the continuous development of modern science and technology, high temperature butterfly valves are used more and more widely. For example, thermal power plants, nuclear power plants, oil refineries and heating companies often use high temperature valves, so the requirements for existing butterfly valves are getting higher and higher.

[0003] Currently, many high-temperature butterfly valves use multi-layer sealing rings and pure metal seals between the valve seat and the butterfly plate. The upper seal at the packing is usually fixed with simple bolts. Therefore, there are still the following defects:

[0004] (1) High-temperature butterfly valves are mostly used in high-pressure and high-temperature media, and the fluidity of the media is also relatively large. During use, the sealing ring is often subjected to the erosion of the media, which can easily lead to the failure of the sealing layer.

[0005] (2) Under high temperature conditions, when the clearance between the metal sealing ring and the butterfly plate is large, the switch will operate normally and will not get stuck. However, the sealing leakage will be large. When the clearance is small, the sealing ring and the butterfly plate may get stuck due to the different expansion coefficients of the materials.

[0006] (3) Currently, the filler is often sealed in the form of graphite. Graphite is easily oxidized and consumed in an oxygen environment above 450°C, which is an essential property of the material.

[0007] Based on this, the present invention designs a low-leakage high-temperature butterfly valve to solve the above problems. Summary of the Invention

[0008] The purpose of the present invention is to provide a low-leakage high-temperature butterfly valve, which is a self-compensating packing seal. When the packing is oxidized and consumed, it can automatically compensate for the consumption, thereby ensuring sealing. This form reduces the packing replacement cycle and reduces maintenance costs. Under high-temperature environmental conditions, it can ensure the sealing of the high-temperature butterfly valve and the smooth opening and closing of the butterfly plate.

[0009] To achieve the above objectives, the present invention provides the following technical solutions: a low-leakage, high-temperature butterfly valve, comprising an upper valve stem, a valve seat, a butterfly plate, a valve body, and a lower valve stem, wherein the upper valve stem passes through the interior of the valve body, a bracket is sleeved into the upper valve stem and fixed to the valve body by bolts; the lower valve stem passes through the valve body and is mounted on the butterfly plate, and a bracket and a bottom cover are respectively mounted on the upper and lower parts of the valve body;

[0010] The valve seat is fixed to the valve body by screws, and the valve seat presses the J-shaped sealing ring onto the valve body. Valve seat sealing rings are arranged on both sides of the long side of the J-shaped sealing ring, and a spring loading ring is arranged inside the J-shaped sealing ring. The spring loading ring is formed by connecting end to end to increase the elasticity of the J-shaped sealing ring.

[0011] Furthermore, a packing installation hole is provided in the bracket, and the packing pad, the packing, and the packing sleeve are sequentially passed through the upper valve stem and installed in the packing installation hole;

[0012] Furthermore, the packing pressure plate is installed on the bracket through the studs, and the packing pressure plate fixes the packing pad, packing and packing sleeve. A disc spring is set between the studs and the bracket to realize automatic compensation after the packing is consumed to ensure the upper sealing;

[0013] Preferably, the upper valve stem passes through the valve body shaft hole and is installed on the butterfly plate through a spline, and the lower valve stem passes through the valve body shaft hole and is installed on the butterfly plate through a spline.

[0014] Preferably, the bottom cover is fixed to the valve body by bolts or welding, and the bracket is sleeved into the upper valve stem and fixed to the valve body by bolts.

[0015] Preferably, a nut for adjusting tightness is provided on the stud.

[0016] Preferably, the J-shaped sealing ring is used in interference fit with the butterfly plate. When the butterfly plate is closed, the butterfly plate squeezes the J-shaped sealing ring to deform it and squeeze it with the spring loading ring. The J-shaped sealing ring and the spring loading ring jointly provide elastic force to achieve sealing between the butterfly plate.

[0017] Preferably, a shaft sleeve is mounted on the upper valve stem, a step is provided on the upper valve stem, and the upper valve stem is fixed up and down after the bracket and the valve body are installed and fixed.

[0018] Preferably, a sealing ring is installed between the bracket and the valve body to prevent leakage between the bracket and the valve body.

[0019] Preferably, a lower sealing ring is installed between the bottom cover and the valve body to prevent leakage between the bottom cover and the valve body.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention sets a disc spring when the stud and the bracket are installed. The disc spring has good elasticity and can realize automatic compensation after the packing is consumed during use, thereby ensuring the upper seal and extending the service life of the high-temperature butterfly valve.

[0022] 2. The stud of the present invention adopts a full-thread form. When the filler is consumed too much during use and the automatic compensation of the disc spring fails, the nut can be tightened downward to restore the automatic compensation ability of the disc spring, thereby extending the maintenance and replacement time.

[0023] 3. The present invention adopts a J-shaped sealing ring and is provided with a spring loading ring at the same time. The spring loading ring is formed by connecting end to end to increase the elasticity of the J-shaped sealing ring and make it have good elasticity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 Schematic diagram of the internal structure of the present invention;

[0026] Figure 2 It is a partially enlarged structural schematic diagram of the J-type sealing ring, spring loading ring and valve seat sealing ring of the present invention.

[0027] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0028] 1- bracket, 2- connecting sleeve, 3- stud, 4- nut, 5- packing sleeve, 6- packing, 7- packing washer, 8- disc spring, 9- packing pressure plate, 10- upper valve stem, 11- upper sealing ring, 12- shaft sleeve, 13- screw, 14- valve seat, 15- butterfly plate, 16- bottom cover, 17- valve body, 18- lower valve stem, 19- lower sealing ring, 20- J-type sealing ring, 21- spring loading ring, 22- valve seat sealing ring. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] See also Figure 1-2 The present invention provides a technical solution: a low-leakage, high-temperature butterfly valve, including a bracket 1, a connecting sleeve 2, a stud 3, a nut 4, a packing sleeve 5, a packing 6, a packing gasket 7, a disc spring 8, a packing pressure plate 9, an upper valve stem 10, an upper sealing ring 11, a shaft sleeve 12, a screw 13, a valve seat 14, a butterfly plate 15, a bottom cover 16, a valve body 17, a lower valve stem 18, a lower sealing ring 19, a J-type sealing ring 20, a spring loading ring 21, and a valve seat sealing ring 22; the upper valve stem 10 passes through the axial hole of the valve body 17 and is installed on the butterfly plate 15 through a spline, the bracket 1 is sleeved into the upper valve stem 10 and is fixed to the valve body 17 by bolts; the lower valve stem 18 passes through the axial hole of the valve body 17 and is installed on the butterfly plate 15 through a spline, and the bottom cover 16 is fixed to the valve body 17 by bolts or welding.

[0031] A mounting hole for packing 6 is provided in the bracket 1. The packing pad 7, packing 6 and packing sleeve 5 are sequentially installed in the packing hole of the bracket 1 through the upper valve stem 10, and then the packing pressure plate 9 is installed on the spacer 1 through the stud 3 to fix the packing pad 7, packing 6 and packing sleeve 5, thereby ensuring the sealing performance. The packing pad 7 can prevent the packing 6 from being deformed or broken. A disc spring 8 is provided when the stud 3 is installed with the bracket 1. The disc spring 8 has good elasticity and can realize automatic compensation after the packing 6 is consumed during use, thereby ensuring the upper sealing and extending the service life of the high-temperature butterfly valve.

[0032] The stud 3 adopts a full-thread form. When the filler 6 is consumed too much during use and the automatic compensation of the disc spring 8 fails, the nut 4 can be tightened downward to restore the automatic compensation ability of the disc spring 8, thereby extending the maintenance and replacement time.

[0033] The valve seat 14 is fixed to the valve body 17 by screws 13. The valve seat 14 presses the J-type sealing ring 20 onto the valve body 17. Valve seat sealing rings 22 are arranged on both sides of the long side of the J-type sealing ring 20 to ensure the sealing between the valve body 17 and the valve seat 14. A spring loading ring 21 is arranged in the J-type sealing ring 20. The spring loading ring 21 is formed by connecting end to end to increase the elasticity of the J-type sealing ring 20 and make it have good elasticity. The J-type sealing ring 20 is used in an interference fit with the butterfly plate 15. When the butterfly plate 15 is closed, the butterfly plate 15 squeezes the J-type sealing ring 20 to deform it and squeeze it with the spring loading ring 21. The J-type sealing ring 20 and the spring loading ring 21 jointly provide elastic force to achieve a sealing effect with the butterfly plate 15.

[0034] The shaft sleeve 12 is sleeved on the upper valve stem 10, and a step is provided on the upper valve stem 10. After the bracket 1 and the valve body 17 are installed and fixed, the upper valve stem 10 is fixed up and down, thereby preventing the upper valve stem 10 from flying out, avoiding flying out damage, and playing a protective role; at the same time, a sealing ring 11 is installed between the bracket 1 and the valve body 17 to prevent leakage between the bracket 1 and the valve body 17, thereby playing a good sealing role.

[0035] A lower sealing ring 19 is installed between the bottom cover 16 and the valve body 17 to prevent leakage between the bottom cover 16 and the valve body 17 and play a good sealing role.

[0036] The present invention sets a disc spring 8 when the stud 3 and the bracket 1 are installed. The disc spring 8 has good elasticity and can realize automatic compensation after the packing 6 is consumed during use, thereby ensuring the upper seal and extending the service life of the high-temperature butterfly valve.

[0037] The stud 3 adopts a full-thread form. When the filler 6 is consumed too much during use and the automatic compensation of the disc spring 8 fails, the nut 4 can be tightened downward to restore the automatic compensation ability of the disc spring 8, thereby extending the maintenance and replacement time.

[0038] By designing a J-shaped sealing ring 20 and arranging a spring loading ring 21 at the same time, the spring loading ring 21 is formed by connecting end to end, thereby increasing the elasticity of the J-shaped sealing ring 20 and making it have good elasticity.

[0039] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0040] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-leakage, high-temperature butterfly valve comprising an upper valve stem (10), a valve seat (14), a butterfly plate (15), a valve body (17) and a lower valve stem (18), characterized in that: The upper valve stem (10) passes through the interior of the valve body (17), and the bracket (1) is inserted into the upper valve stem (10) and fixed to the valve body (17) by bolts; the lower valve stem (18) passes through the valve body (17) and is installed on the butterfly plate (15), and the bracket (1) and the bottom cover (16) are installed on the upper and lower parts of the valve body (17) respectively; The valve seat (14) is fixed on the valve body (17), and the valve seat (14) presses the J-shaped sealing ring (20) on the valve body (17). Valve seat sealing rings (22) are provided on both sides of the long side of the J-shaped sealing ring (20), and a spring loading ring (21) is provided inside the J-shaped sealing ring (20). The spring loading ring (21) is formed by connecting the end to the end to increase the elasticity of the J-shaped sealing ring (20); A packing installation hole is provided in the bracket (1), and a packing pad (7), a packing (6), and a packing sleeve (5) are sequentially passed through the upper valve stem (10) and installed in the packing installation hole; The packing pressure plate (9) is installed on the bracket (1) through the stud (3). The packing pressure plate (9) fixes the packing pad (7), the packing (6), and the packing sleeve (5). A disc spring (8) is provided between the stud (3) and the bracket (1) to realize automatic compensation after the packing (6) is consumed, thereby ensuring the upper sealing; The J-shaped sealing ring (20) is used in an interference fit with the butterfly plate (15). When the butterfly plate (15) is closed, the butterfly plate (15) squeezes the J-shaped sealing ring (20) to deform it and squeeze it with the spring loading ring (21). The J-shaped sealing ring (20) and the spring loading ring (21) jointly provide elastic force to achieve sealing between the butterfly plate (15).

2. A low leakage, high temperature butterfly valve according to claim 1, characterized in that: The upper valve stem (10) passes through the axial hole of the valve body (17) and is mounted on the butterfly plate (15) via a spline, and the lower valve stem (18) passes through the axial hole of the valve body (17) and is mounted on the butterfly plate (15) via a spline.

3. A low leakage, high temperature butterfly valve according to claim 1, characterized in that: The bottom cover (16) is fixed to the valve body (17) by means of bolts or welding, and the bracket (1) is inserted into the upper valve stem (10) and fixed to the valve body (17) by means of bolts.

4. A low leakage, high temperature butterfly valve according to claim 1, characterized in that: The stud (3) is provided with a nut (4) for adjusting the tightness.

5. The low leakage high temperature butterfly valve according to claim 1, characterized in that: The upper valve stem (10) is sleeved with a shaft sleeve (12), and a step is provided on the upper valve stem (10). After the bracket (1) and the valve body (17) are installed and fixed, the upper valve stem (10) is fixed up and down.

6. The low leakage high temperature butterfly valve according to claim 1, characterized in that: A sealing ring (11) is installed between the bracket (1) and the valve body (17) to prevent leakage between the bracket (1) and the valve body (17).

7. The low leakage, high temperature butterfly valve according to claim 1, characterized in that: A lower sealing ring (19) is installed between the bottom cover (16) and the valve body (17) to prevent leakage between the bottom cover (16) and the valve body (17).

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