Vacuum-resistant bracket structure of atmospheric valve rupture disk

Abstract

The invention belongs to the technical field of large steam turbine atmospheric valve rupture disks, and discloses an atmospheric valve rupture disk vacuum-resistant bracket structure which comprises a supporting ring and a supporting frame, the supporting ring is arranged on the vacuum side and the supporting frame is arranged on the pressure relief side, and supporting ring sealing planes are arranged on the upper face and the lower face, away from the outer circle edge, of the supporting ring. A supporting ring spherical crown is arranged at the intersection of the interior of the supporting ring and the supporting ring sealing plane, a hollow through hole is formed in the supporting ring spherical crown, supporting frame sealing planes are arranged on the upper face and the lower face, away from the outer circle edge, of the supporting frame, a supporting frame spherical crown is arranged at the intersection of the interior of the supporting frame and the supporting frame sealing plane, and a circular through seam is formed in the inner side of the root of the supporting frame spherical crown. Compared with a traditional vacuum-resistant bracket, the vacuum-resistant bracket has higher back pressure resistance and longer service life, the hidden danger that fragments fall off after blasting is eliminated, and it is ensured that a discharge channel can be completely opened.

Description

Technical Field

[0001] This application belongs to the technical field of large steam turbine atmosphere valve rupture discs, and particularly relates to a vacuum-resistant bracket structure for an atmosphere valve rupture disc. Background Art

[0002] A rupture disc is one of the important safety accessories for pressure vessels. When the pressure vessel is overpressured, the rupture disc can quickly burst and release the internal pressure, preventing the pressure from continuing to rise and avoiding the explosion of the pressure vessel. The atmosphere valve rupture disc of a steam turbine plays an important role in overpressure protection of the steam turbine, and is of great significance for preventing major mechanical damage to the steam turbine due to excessive exhaust pressure. During the operation of a power plant, the rupture disc of the steam turbine serves as the pressure boundary of the vacuum system. Once it fails, it will cause the unit to shut down unexpectedly. Therefore, the reliability of the steam turbine rupture disc is crucial for ensuring the safe and economic operation of the power plant.

[0003] In recent years, domestic research and development of steam turbine atmosphere valve rupture discs has begun. Currently, some power plants have completed domestic substitution and the use effect is good. During the operation of the steam turbine, the low-pressure cylinder is in a vacuum state, and the atmosphere valve rupture disc needs to bear the back pressure during operation. Once the rupture disc cannot bear the back pressure, it will be damaged and its performance will not meet the requirements, posing a great safety hazard.

[0004] The traditional vacuum-resistant bracket is a single-layer diaphragm with slits or holes opened on the spherical crown, and is supported by several square or circular support plates to resist the back pressure. Under the long-term action of harsh working conditions such as vibration, high temperature, and pressure, once the square or circular support plates fall off, the back pressure resistance ability of the vacuum-resistant bracket will rapidly decline or completely lose the ability to bear the back pressure. In addition, problems such as a large number of fragments will occur. Summary of the Invention

[0005] The purpose of this application is to overcome the defects of the prior art, and thus provide a vacuum-resistant bracket structure for an atmosphere valve rupture disc, which has stronger back pressure resistance ability and longer service life than the traditional vacuum-resistant bracket, eliminates the hidden danger of fragment shedding after bursting, and ensures that the relief channel can be fully opened.

[0006] To achieve the above purpose, this application provides the following technical solutions:

[0007] A vacuum-resistant bracket structure for an atmosphere valve rupture disc includes a support ring and a support frame. The support ring is arranged on the vacuum side and the support frame is on the pressure relief side;

[0008] Support ring sealing planes are provided on the upper and lower surfaces of the support ring at a distance from the outer circle edge. A support ring spherical crown is provided at the intersection of the inside of the support ring and the support ring sealing plane, and a hollow through hole is opened in the support ring spherical crown;

[0009] The upper and lower surfaces of the support frame away from the outer circle edge are provided with support frame sealing planes. A support frame spherical crown is provided at the intersection of the interior of the support frame and the support frame sealing planes. A circular through slot is provided inside the root of the support frame spherical crown.

[0010] The support ring spherical crown and the support frame spherical crown are adapted, and the support ring sealing plane and the support frame sealing plane are adapted.

[0011] In some embodiments, round holes are provided at both ends of the circular through slot.

[0012] In some embodiments, the diameter of the round hole is 1 mm to 5 mm.

[0013] In some embodiments, an included angle of 10° to 90° is left uncut through the circular through slot.

[0014] In some embodiments, the diameter of the circular through slot is 5 mm to 20 mm larger than the diameter of the hollow through hole.

[0015] In some embodiments, the ratio of the height of the support ring spherical crown to the circular diameter at the root of the spherical crown is 0.1 to 0.2.

[0016] In some embodiments, both the support ring and the support frame are made of stainless steel plates.

[0017] In some embodiments, the support ring and the support frame are circular structures and are cut into circular diaphragms by mechanical processing means.

[0018] In some embodiments, the circular dimension of the support ring is much larger than its thickness, and the circular dimension of the support frame is much larger than its thickness.

[0019] In some embodiments, the edges of the support ring and the support frame are fixedly connected by resistance welding.

[0020] Compared with the prior art, the atmospheric valve rupture disk vacuum-resistant bracket structure provided by the present application has the following beneficial effects:

[0021] The present application provides a high-reliability atmospheric valve rupture disk vacuum-resistant bracket structure. Compared with the traditional vacuum-resistant bracket, the present invention has stronger vacuum resistance and back pressure capacity (test verification shows that it can withstand 4.5 times the backup pressure), longer service life (it can still rupture normally after 900 fatigue tests), no fragments after rupture, and the discharge channel can be fully opened, with more stable performance.

[0022] In this application, a support ring and a support frame are used in combination. The spherical crown on the support ring fits perfectly with the spherical crown on the support frame. When the back pressure is borne by the rupture disk of the atmospheric valve, since the sealing planes on the support ring and the support frame are clamped, the spherical crown on the support ring can provide support for the spherical crown of the support frame, preventing the spherical crown of the support frame from deforming or becoming unstable, and thus ensuring that the entire rupture disk does not deform. When the rupture disk reaches the bursting pressure and relieves pressure by bursting, the support frame is completely opened through its circular through-slit to the relief channel, and the spherical crown of the support frame is tightened by the uncut part of the circular through-slit to prevent it from falling off. The support ring and the support frame are each an integral structure, and their peripheries are clamped by flanges, and there are no fragments. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of this application, the following will briefly introduce the drawings required for the technical description.

[0024] Figure 1 The front view of the assembled support ring and support frame provided by this application;

[0025] Figure 2 The top view of the assembled support ring and support frame provided by this application;

[0026] Figure 3 The front view of the support ring provided by this application;

[0027] Figure 4 The top view of the support ring provided by this application;

[0028] Figure 5 The front view of the support frame provided by this application;

[0029] Figure 6 The top view of the support frame provided by this application.

[0030] Explanation of the Reference Numerals in the Drawings:

[0031] 1. Support ring; 2. Support frame; 3. Support ring sealing plane; 4. Support ring spherical crown; 5. Hollow through-hole; 6. Circular through-slit; 7. Round hole; 8. Support frame spherical crown; 9. Support frame sealing plane. Detailed Description of the Embodiments

[0032] The following will be further described in detail through specific embodiments.

[0033] As Figures 1 to 6 shown, this application provides a vacuum-resistant bracket structure for the rupture disk of an atmospheric valve. The vacuum-resistant bracket structure is used in combination with a positive-arch slotted rupture disk to provide the positive-arch slotted rupture disk with the ability to resist vacuum and back pressure. The vacuum-resistant bracket structure is a double-layer structure, including a support ring 1 and a support frame 2. After the support ring 1 and the support frame 2 are combined, they are fixedly connected by resistance welding at their edges.

[0034] Optionally, the materials used for the support ring 1 and the support frame 2 are both austenitic stainless steel.

[0035] Optionally, the support ring 1 and the support frame 2 are made of austenitic stainless steel sheets.

[0036] The support ring 1 and the support frame 2 are circular structures. The sheets are cut into circular diaphragms by machining means, and then formed into arched spherical crowns through tooling. The upper and lower surfaces at a certain distance from the outer circle edge are planes, and the intersection of the interior with the planes is a spherical crown structure. The spherical crown structures and dimensions of the support ring 1 and the support frame 2 are the same and fit seamlessly. The support ring 1 and the support frame 2 are used in combination, with the support ring 1 on the vacuum side and the support frame 2 on the pressure relief side.

[0037] As Figure 3 and Figure 4 shown, the support ring 1 is a circular structure. Its circular dimension is much larger than its thickness. The upper and lower surfaces at a certain distance (for example, 3 mm to 4 mm) from the outer circle edge are the support ring sealing planes 3. The intersection of the interior with the support ring sealing plane 3 is a support spherical crown 4. The interior is completely cut off by laser or equivalent process on the support spherical crown 4 to form a hollow through hole 5.

[0038] As Figure 5 and Figure 6 shown, the support frame 2 is a circular structure. Its circular dimension is much larger than its thickness. The upper and lower surfaces at a certain distance from the outer circle edge are the support frame sealing planes 9. The intersection of the interior with the support frame sealing plane 9 is a support frame spherical crown 8. A circular through slot 6 is machined on the support frame spherical crown 8 by laser or equivalent process.

[0039] The support ring 1 has a hollow through hole structure (hollow through hole 5) at a certain distance inside the root of the support spherical crown 4. The remaining part of the support spherical crown 4 fits seamlessly with the spherical crown surface of the support frame 2. The support frame 2 is machined with a circular through slot 6 with a width of 0.2 mm to 1 mm at a certain distance inside the root of the support frame spherical crown 8. The circular through slot 6 has a certain angle α (as Figure 6 shown) not cut through. The diameter of the circular through slot 6 is larger than the diameter of the hollow through hole 5 of the support ring 1.

[0040] Optionally, the circular through slot 6 has an included angle of 10° to 90° not cut through.

[0041] Optionally, circular holes 7 with a diameter of 1 mm to 5 mm are left at both ends of the circular through slot 6.

[0042] Optionally, the diameter of the circular through slot 6 is 5 mm to 20 mm larger than the diameter of the hollow through hole 5 of the support ring 1.

[0043] Optionally, the ratio of the height of the supporting spherical crown 4 to the circular diameter at the root of the spherical crown is 0.1 to 0.2. The height of the supporting spherical crown 4 is the distance from the highest point of the arch to the edge sealing plane, and the circular diameter at the root of the supporting spherical crown is the circular diameter where the arched spherical crown intersects the edge sealing plane.

[0044] The support ring 1 and the support frame 2 are used in cooperation. The supporting spherical crown 4 on the support ring 1 fits perfectly with the supporting spherical crown 8 on the support frame 2. When the atmospheric valve rupture disk bears back pressure, since the sealing planes on the support ring 1 and the support frame 2 (the support ring sealing plane 3 and the support frame sealing plane 9) are clamped, the supporting spherical crown 4 can provide support for the support frame spherical crown 8, preventing the support frame spherical crown 8 from deforming or buckling, and thus ensuring that the rupture disk as a whole does not deform. When the rupture disk reaches the bursting pressure and bursts to relieve pressure, the support frame 2 opens the relief channel completely through its circular through slot 6, and tightens the support frame spherical crown 8 through the uncut part of the circular through slot 6 to prevent it from falling off. The support ring 1 and the support frame 2 are each an integral structure, and the peripheries are clamped by flanges, and there are no fragments.

[0045] The outer diameters of the support ring 1 and the support ring 2 are exactly the same; the sizes of the supporting spherical crown 4 and the support frame spherical crown 8 are basically the same, that is, the supporting spherical crown 4 on the support ring 1 is slightly smaller than the support frame spherical crown 8 on the support frame 2, that is, the inner one will be slightly smaller to facilitate fitting together. Among them, the circular through slot 6 and the hollow through hole 5 are processed by laser or equivalent processes.

[0046] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A vacuum-resistant bracket structure for an atmospheric valve bursting disc, characterized in that: It comprises a support ring (1) and a support frame (2), wherein the support ring (1) is arranged on the vacuum side and the support frame (2) is arranged on the pressure relief side; The support ring (1) is provided with a support ring sealing plane (3) on the upper and lower sides away from the outer circular edge, and a support ring crown (4) is provided at the intersection of the interior of the support ring (1) and the support ring sealing plane (3), and the support ring crown (4) is provided with a hollow through hole (5); The support frame (2) is provided with a support frame sealing plane (9) on the upper and lower sides away from the outer circular edge, a support frame spherical cap (8) is provided at the intersection of the interior of the support frame (2) and the support frame sealing plane (9), and a circular through slit (6) is provided on the inner side of the root of the support frame spherical cap (8); The support spherical ball crown (4) and the support frame spherical ball crown (8) are adapted to each other, and the support ring sealing plane (3) and the support frame sealing plane (9) are adapted to each other.

2. The vacuum-resistant bracket structure of the atmospheric valve bursting disc according to claim 1, characterized in that: Circular holes (7) are provided at both ends of the circular through slit (6).

3. The vacuum-resistant bracket structure of the atmospheric valve bursting disc according to claim 2 is characterized in that: The diameter of the circular hole (7) is 1 mm to 5 mm.

4. The vacuum-resistant bracket structure for the atmospheric valve bursting disc according to claim 1, characterized in that: The circular through-slit (6) has an angle of 10° to 90° left uncut.

5. The vacuum-resistant bracket structure for the atmospheric valve bursting disc according to claim 1, characterized in that: The diameter of the circular through slit (6) is 5 mm to 20 mm larger than the diameter of the hollow through hole (5).

6. The vacuum-resistant bracket structure for the atmospheric valve bursting disc according to claim 1, characterized in that: The ratio of the height of the supporting spherical crown (4) to the circular diameter of the spherical crown root is 0.1 to 0.

2.

7. The vacuum-resistant bracket structure for an atmospheric valve bursting disc according to claim 1, characterized in that: The support ring (1) and the support frame (2) are both made of stainless steel plates.

8. The vacuum-resistant bracket structure for an atmospheric valve bursting disc according to claim 1, characterized in that: The support ring (1) and the support frame (2) are circular structures and are cut into circular membranes by mechanical processing means.

9. The vacuum-resistant bracket structure for the atmospheric valve bursting disc according to claim 8, characterized in that: The circular size of the support ring (1) is much larger than its thickness, and the circular size of the support frame (2) is much larger than its thickness.

10. The vacuum-resistant bracket structure of the atmospheric valve bursting disc according to claim 1, characterized in that: The edges of the support ring (1) and the support frame (2) are connected and fixed by resistance welding.

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