Steam turbine exhaust hood atmospheric valve

Abstract

The utility model relates to the technical field of steam turbine exhaust hoods, in particular to a steam turbine exhaust hood atmospheric valve which comprises a valve shell, a valve port is formed in the valve shell, a second valve deck is installed in the valve port, a first connecting seat is installed on the outer surface of the valve shell, and a second connecting seat is installed on the outer surface of the second valve deck. The second connecting seat is detachably connected with the other end of the connecting rod; a second asbestos rubber plate is installed on the outer surface of the valve shell and can cover the outer surface of the second valve deck. According to the valve, the valve shell and the second valve cover are connected together through the connecting rod, after the second valve cover is closed, under the connecting effect of the connecting rod, during transportation and a hydrostatic test, the second valve cover is also firm and stable, the second asbestos rubber plate cannot be damaged, a temporary gasket does not need to be additionally arranged, repeated mounting and dismounting are not needed, repeated procedures are reduced, and the construction period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine exhaust cylinders, in particular to an atmospheric valve for a steam turbine exhaust cylinder. Background Art

[0002] The exhaust cylinder atmospheric valve of the steam turbine is a safety protection facility for the vacuum system. The sudden interruption of the cooling water of the condenser of the condensing steam turbine unit will cause the absolute pressure of the exhaust steam to exceed one atmosphere. When the steam pressure is too high, the exhaust cylinder atmospheric valve opens to discharge the steam in the steam turbine and condenser to the atmosphere, which plays a role in protecting the condenser and the exhaust cylinder.

[0003] Reference Figure 1 The exhaust cylinder atmospheric valve in the prior art is mainly composed of a clamping ring 3, a first valve cover 7, a 1mm first asbestos rubber sheet 6, etc. The gray cast iron cast valve seat 9 is equipped with the first valve cover 7, the clamping ring 3 and the first asbestos rubber sheet 6 installed between the clamping ring 3 and the first valve cover 7. Under normal vacuum conditions, the first asbestos rubber sheet 6 is pressed inward on the first valve cover 7 by the external atmospheric pressure; when the steam pressure in the exhaust cylinder rises to a certain value, the steam pressure in the exhaust cylinder acts on the first valve cover 7, and the shear force formed by the first valve cover 7 and the clamping ring 3 breaks the first asbestos rubber sheet 6, thereby allowing the steam to be discharged into the atmosphere. There is a limit cover 8 on the exhaust cylinder atmospheric valve to prevent the first valve cover 7 and the first asbestos rubber sheet 6 from flying out when the atmospheric valve is actuated. The limit cover 8 is installed on the valve seat 9 through the first studs 2 and the first nut 1 on both sides, and the first studs 2 press the first asbestos rubber sheet 6 on the outer surface of the first valve cover 7. When the steam turbine manufacturer conducts cylinder hydraulic test and transportation, a temporary gasket 5 is installed above the first asbestos rubber sheet 6. The temporary gasket 5 can press the first asbestos rubber sheet 6 and the first valve cover 7, stabilize the first valve cover 7, and protect the first asbestos rubber sheet 6 from damage. An asbestos rubber sheet gasket 4 is also installed between the top of the temporary gasket 5 and the travel limit cover 8. During installation, the temporary gasket 5 must be removed, otherwise the atmospheric valve will lose its protective function.

[0004] As described above, the exhaust cylinder atmospheric valve in the above-mentioned prior art needs to be installed with a temporary gasket 5 to protect the first asbestos rubber sheet 6 when the cylinder is transported; however, during on-site installation, the temporary gasket 5 needs to be removed, otherwise the protective function of the atmospheric valve is lost, and repeated loading and unloading makes the process complicated and affects the construction period. Utility Model Content

[0005] In order to solve the technical problem that in the prior art, when the exhaust cylinder atmospheric valve is transported, a temporary gasket for protecting the asbestos rubber sheet needs to be installed, but during on-site installation, the temporary gasket needs to be removed, otherwise the protective effect of the atmospheric valve will be lost, and repeated loading and unloading will cause complicated procedures and affect the construction period, the utility model provides a turbine exhaust cylinder atmospheric valve.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A steam turbine exhaust cylinder atmospheric valve comprises a valve housing, a valve port is formed in the valve housing, a second valve cover is installed in the valve port, a first connecting seat is installed on the outer surface of the valve housing, a second connecting seat is installed on the outer surface of the second valve cover, the first connecting seat is detachably connected to one end of a connecting rod, and the second connecting seat is detachably connected to the other end of the connecting rod; a second asbestos rubber sheet is installed on the outer surface of the valve housing, and the second asbestos rubber sheet can cover the outer surface of the second valve cover.

[0008] With the above structural scheme, under normal vacuum conditions, the second asbestos rubber sheet is pressed against the outer surface of the second valve cover. When the steam pressure in the exhaust cylinder rises to a certain value, the steam pressure in the exhaust cylinder acts on the second valve cover, breaking the second asbestos rubber sheet, thereby allowing the steam to be discharged into the atmosphere. The valve housing and the second valve cover are connected together by a connecting rod. After the second valve cover is closed, under the connecting action of the connecting rod, the second valve cover is also firm and stable during transportation and water pressure testing, and the second asbestos rubber sheet will not be damaged. There is no need to install temporary gaskets, and there is no need for repeated installation and disassembly, which reduces repeated processes and shortens the construction period.

[0009] As a preferred implementation method of the atmospheric valve of a steam turbine exhaust cylinder, a plurality of inner pressure rings are provided on the outer surface of the second valve cover, and the inner pressure ring is installed on the second valve cover through a second stud, and a second nut is installed at one end of the second stud extending out of the outer surface of the second valve cover, and the inner pressure ring is pressed between the second nut and the second valve cover; a plurality of outer pressure rings are provided on the outer surface of the valve housing, and the outer pressure ring is installed on the outer surface of the valve housing through a third stud, and a second nut is installed at one end of the third stud extending out of the outer surface of the valve housing, and the outer pressure ring is pressed between the second nut and the valve housing; the second stud and the third stud both pass through the second asbestos rubber sheet, and the third asbestos rubber sheet is pressed between the inner pressure ring and the second valve cover, and the third asbestos rubber sheet is pressed between the outer pressure ring and the valve housing.

[0010] As a preferred implementation of a turbine exhaust cylinder atmospheric valve, the first connecting seat is connected to one end of the connecting rod via a pin, and the second connecting seat is connected to the other end of the connecting rod via a pin.

[0011] By adopting the above structural solution, the connection method is simple and the cost is low.

[0012] As a preferred implementation of a turbine exhaust cylinder atmospheric valve, the size of the first connecting seat gradually increases in a direction approaching the valve housing, and the size of the second connecting seat gradually increases in a direction approaching the second valve cover.

[0013] The above structural solution is adopted to improve the firmness of the first connecting seat and the second connecting seat.

[0014] As a preferred implementation of the atmospheric valve of a steam turbine exhaust cylinder, the side wall of the second valve cover that is connected to the valve port gradually shrinks in the direction toward the inside of the valve housing.

[0015] By adopting the above structural solution, after the second valve cover is connected to the valve port, the valve port can limit the second valve cover, making the second valve cover more firm and stable.

[0016] As a preferred implementation of a turbine exhaust cylinder atmospheric valve, a plurality of inner pressure rings are arranged in a circular pattern.

[0017] As a preferred implementation of a turbine exhaust cylinder atmospheric valve, a plurality of outer pressure rings are arranged in a circular array.

[0018] As a preferred implementation method of a turbine exhaust cylinder atmospheric valve, an asbestos rubber ring is connected to the inner surface of the valve housing, one end of all third studs passing through the inner surface of the valve housing passes through the opening on the asbestos rubber ring, and the third studs are interference connected with the opening on the asbestos rubber ring.

[0019] With the above structural solution, the asbestos rubber ring plays a sealing role.

[0020] As a preferred implementation of a turbine exhaust cylinder atmospheric valve, the second connecting seat is located in the center of the second valve cover.

[0021] The above structural solution is adopted to enhance the stability of the second valve cover.

[0022] As a preferred implementation of a turbine exhaust cylinder atmospheric valve, a protective cover is connected to the outer surface of the valve housing, and the protective cover surrounds the second valve cover.

[0023] By adopting the above structural solution, the protective cover can prevent the second valve cover from flying around.

[0024] The beneficial effects of the utility model include:

[0025] Under normal vacuum conditions, the second asbestos rubber sheet is pressed against the outer surface of the second valve cover. When the steam pressure in the exhaust cylinder rises to a certain value, the steam pressure in the exhaust cylinder acts on the second valve cover, breaking the second asbestos rubber sheet, thereby allowing the steam to be discharged into the atmosphere. The valve housing and the second valve cover are connected together by a connecting rod. After the second valve cover is closed, under the connecting action of the connecting rod, the second valve cover is also firm and stable during transportation and water pressure testing, and the second asbestos rubber sheet will not be damaged. There is no need to install temporary gaskets, and there is no need for repeated installation and disassembly, which reduces repeated processes and shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a half-section structural schematic diagram of a steam turbine exhaust cylinder atmospheric valve in the prior art;

[0028] Figure 2 It is a schematic diagram of the half-section structure of a steam turbine exhaust cylinder atmospheric valve in a specific implementation manner of the utility model.

[0029] List of parts and reference numerals:

[0030] 1. First nut; 2. First stud; 3. Clamping ring; 4. Asbestos rubber sheet gasket; 5. Temporary gasket; 6. First asbestos rubber sheet; 7. First valve cover; 8. Limit cover; 9. Valve seat;

[0031] 10. Valve housing; 11. Pin shaft; 12. Connecting rod; 13. Second valve cover; 14. Second asbestos rubber sheet; 15. Inner pressure ring; 16. Second stud; 17. Second nut; 18. Outer pressure ring; 19. Third stud; 20. Protective cover; 21. Asbestos rubber ring. DETAILED DESCRIPTION

[0032] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme in the utility model will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Reference Figure 2This embodiment proposes a turbine exhaust cylinder atmospheric valve, including a valve housing 10, the valve housing 10 is provided with a valve port, a second valve cover 13 is installed in the valve port, the side wall of the second valve cover 13 that is connected to the valve port gradually shrinks in the direction toward the inside of the valve housing 10, and the connecting surface between the second valve cover 13 and the valve port is an inverted cone surface, which can limit the second valve cover 13 and make the second valve cover 13 more firm and stable. A first connecting seat is installed on the outer surface of the valve housing 10, and the size of the first connecting seat gradually increases in the direction close to the valve housing 10. A second connecting seat is installed on the outer surface of the second valve cover 13, and the second connecting seat is located in the center of the second valve cover 13. The size of the second connecting seat gradually increases in the direction close to the second valve cover 13. The first connecting seat is connected to one end of the connecting rod 12 through a pin shaft 11, and the second connecting seat is connected to the other end of the connecting rod 12 through a pin shaft 11.

[0034] The outer surface of the second valve cover 13 is provided with a plurality of inner pressure rings 15, which are arranged in a circumferential array. The inner pressure ring 15 is installed on the second valve cover 13 through a second stud 16. The second stud 16 is installed with a second nut 17 at one end extending out of the outer surface of the second valve cover 13. The inner pressure ring 15 is pressed between the second nut 17 and the second valve cover 13. The outer surface of the valve housing 10 is provided with a plurality of outer pressure rings 18, which are arranged in a circumferential array. The outer pressure ring 18 is installed on the outer surface of the valve housing 10 through a third stud 19. The second stud 19 is installed with a second nut 17 at one end extending out of the outer surface of the valve housing 10. The outer pressure ring 18 is pressed between the second nut 17 and the valve housing 10. The outer surface of the valve housing 10 is provided with a second asbestos rubber sheet 14, which can cover the outer surface of the second valve cover 13. The second stud 16 and the third stud 19 both pass through the second asbestos rubber sheet 14 . The third asbestos rubber sheet is pressed between the inner pressure ring 15 and the second valve cover 13 . The third asbestos rubber sheet is pressed between the outer pressure ring 18 and the valve housing 10 .

[0035] The outer surface of the valve housing 10 is connected with a protective cover 20, which surrounds the second valve cover 13. The first connection seat, the second connection seat, the inner pressure ring 15 and the outer pressure ring 18 are all located in the protective cover 20 to prevent the second valve cover 13 from flying around. An asbestos rubber ring 21 is connected to the inner surface of the valve housing 10. One end of all the third studs 19 passing through the inner surface of the valve housing 10 passes through the opening of the asbestos rubber ring 21. The third studs 19 are interference-connected with the opening of the asbestos rubber ring 21, and the asbestos rubber ring 21 plays a sealing role.

[0036] The working principle of this embodiment is:

[0037] Under normal vacuum conditions, the second asbestos rubber sheet 14 is pressed against the outer surface of the second valve cover 13. When the steam pressure in the exhaust cylinder rises to a certain value, the steam pressure in the exhaust cylinder acts on the second valve cover 13, and the shear force formed by the second valve cover 13 and the outer pressure ring 18 breaks the second asbestos rubber sheet 14, thereby allowing the steam to be discharged into the atmosphere. The valve housing 10 and the second valve cover 13 are connected together by the connecting rod 12 and the pin 11, which can prevent the second valve cover 13 from flying out when the atmospheric valve is actuated. In this embodiment, the second valve cover 13 and the valve housing 10 are connected together by the connecting rod 12 and the pin 11. After the second valve cover 13 is closed, under the connection of the connecting rod 12 and the pin 11, the second valve cover 13 is also firm and stable during transportation and water pressure testing, and the second asbestos rubber sheet 14 will not be damaged. There is no need to install a temporary gasket 5, and there is no need to repeatedly install and disassemble, which reduces repeated processes and shortens the construction period.

[0038] In this embodiment, the first connecting seat and one end of the connecting rod 12 can be detachably connected by other connecting methods, and the second connecting seat and the other end of the connecting rod 12 can be detachably connected by other connecting methods, such as snap connection.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steam turbine exhaust cylinder atmospheric valve, comprising a valve housing (10), the valve housing (10) having a valve port, a second valve cover (13) installed in the valve port, characterized in that: A first connecting seat is mounted on the outer surface of the valve housing (10), and a second connecting seat is mounted on the outer surface of the second valve cover (13); the first connecting seat is detachably connected to one end of the connecting rod (12), and the second connecting seat is detachably connected to the other end of the connecting rod (12); a second asbestos rubber sheet (14) is mounted on the outer surface of the valve housing (10), and the second asbestos rubber sheet (14) is capable of covering the outer surface of the second valve cover (13).

2. A steam turbine exhaust cylinder atmospheric valve according to claim 1, characterized in that: A plurality of inner pressure rings (15) are provided on the outer surface of the second valve cover (13). The inner pressure rings (15) are mounted on the second valve cover (13) via second studs (16). A second nut (17) is mounted on one end of the second studs (16) extending out of the outer surface of the second valve cover (13). The inner pressure rings (15) are pressed tightly between the second nut (17) and the second valve cover (13). The outer surface of the valve housing (10) is provided with a plurality of outer pressure rings (18), the outer pressure rings (18) being mounted on the outer surface of the valve housing (10) via third studs (19), a second nut (17) being mounted on one end of the third studs (19) extending out of the outer surface of the valve housing (10), and the outer pressure rings (18) being pressed tightly between the second nut (17) and the valve housing (10); The second stud bolt (16) and the third stud bolt (19) both pass through the second asbestos rubber sheet (14); the third asbestos rubber sheet is pressed between the inner pressure ring (15) and the second valve cover (13); and the third asbestos rubber sheet is pressed between the outer pressure ring (18) and the valve housing (10).

3. A steam turbine exhaust cylinder atmospheric valve according to claim 1, characterized in that: The first connecting seat is connected to one end of the connecting rod (12) via a pin shaft (11), and the second connecting seat is connected to the other end of the connecting rod (12) via a pin shaft (11).

4. A steam turbine exhaust cylinder atmospheric valve according to claim 1, characterized in that: The size of the first connection seat gradually increases in a direction approaching the valve housing (10), and the size of the second connection seat gradually increases in a direction approaching the second valve cover (13).

5. The steam turbine exhaust cylinder atmospheric valve according to claim 1, characterized in that: The side wall of the second valve cover (13) that is butted against the valve port gradually shrinks in a direction toward the interior of the valve housing (10).

6. A steam turbine exhaust cylinder atmospheric valve according to claim 2, characterized in that: A plurality of inner pressure rings (15) are arranged in a circular pattern.

7. A steam turbine exhaust cylinder atmospheric valve according to claim 2, characterized in that: A plurality of outer pressure rings (18) are arranged in a circular array.

8. A steam turbine exhaust cylinder atmospheric valve according to claim 7, characterized in that: An asbestos rubber ring (21) is connected to the inner surface of the valve housing (10), one end of each of the third studs (19) passing through the inner surface of the valve housing (10) passes through an opening on the asbestos rubber ring (21), and the third studs (19) are interference-connected with the opening on the asbestos rubber ring (21).

9. The steam turbine exhaust cylinder atmospheric valve according to claim 1, characterized in that: The second connecting seat is located in the center of the second valve cover (13).

10. The steam turbine exhaust cylinder atmospheric valve according to claim 1, characterized in that: A protective cover (20) is connected to the outer surface of the valve housing (10), and the protective cover (20) surrounds the second valve cover (13).

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