Corrugated pipe sealing experiment device for medium-pressure valve of nuclear power station steam turbine

Abstract

The utility model relates to a corrugated pipe sealing experiment device for a medium-pressure valve of a nuclear power station steam turbine, and belongs to the technical field of metal corrugated pipe sealing. The corrugated pipe sealing experiment device comprises a test rack, a simulation valve rod, a driving part and a sealing cover are arranged on the test rack, and a metal corrugated pipe mechanical seal is installed on the simulation valve rod; the driving piece is used for driving the simulation valve rod to rotate so as to simulate opening and closing of a butterfly valve, the sealing cover is fixedly arranged on the testing rack and is used for surrounding the metal corrugated pipe mechanical seal, the simulation valve rod and the sealing cover are arranged in a sealing mode, the sealing cover is arranged in an opening mode, and the metal corrugated pipe mechanical seal is arranged at the opening of the sealing cover in a sealing mode. An air inlet pipeline and an air outlet pipeline are arranged on the sealing cover, the air inlet pipeline is used for injecting a test medium into the sealing cover, and the air outlet pipeline is used for discharging the test medium in the sealing cover. The mechanical seal testing device has the effect of conveniently testing the mechanical seal of the metal corrugated pipe.

Description

Technical Field

[0001] This application relates to the field of metal bellows sealing technology, and in particular to an experimental device for bellows sealing of intermediate pressure valves in nuclear power plant steam turbines. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. A butterfly valve is characterized by its closing element (valve disc or butterfly plate) being a circular plate that rotates around a valve shaft to open and close. Butterfly valves can control the flow of various types of fluids, including air, water, steam, various corrosive media, slurry, oil, liquid metals, and radioactive media. They primarily function as shut-off and throttling devices in pipelines. The butterfly valve's opening and closing element is a disc-shaped butterfly plate that rotates around its own axis within the valve body, thereby achieving opening, closing, or regulation.

[0003] Butterfly valves are key equipment in the secondary loop of nuclear power plants. The metal bellows mechanical seal used in the steam turbines of domestic nuclear power plants is an important component, and the normal operation of the metal bellows mechanical seal is also an important guarantee for the normal operation of the steam turbine auxiliary system.

[0004] However, metal bellows seals need to be tested for sealing performance before they can be put into use, and currently, the sealing performance of metal bellows is relatively inconvenient. Utility Model Content

[0005] To facilitate the testing of metal bellows mechanical seals, this application provides an experimental device for bellows seals used in intermediate pressure valves of nuclear power plant steam turbines.

[0006] The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine provided in this application adopts the following technical solution:

[0007] A test apparatus for bellows sealing of a medium-pressure valve in a nuclear power plant turbine includes a test frame. A simulated valve stem, a drive component, and a sealing cover are mounted on the test frame. A metal bellows mechanical seal is installed on the simulated valve stem. The drive component drives the simulated valve stem to rotate, simulating the opening and closing of a butterfly valve. The sealing cover is fixedly mounted on the test frame and surrounds the metal bellows mechanical seal. A seal is formed between the simulated valve stem and the sealing cover. The sealing cover has an opening, and the metal bellows mechanical seal is positioned at the opening of the sealing cover. The sealing cover has an inlet pipe and an outlet pipe. The inlet pipe injects test medium into the sealing cover, and the outlet pipe discharges the test medium from the sealing cover.

[0008] Optionally, a protective cover is also included, which is fixedly installed on the opening end face of the sealing cover. A sealing ring is provided between the protective cover and the sealing cover. An vent pipe is provided on the protective cover, and the vent pipe is used to connect the test piece of the test medium.

[0009] Optionally, it also includes a compensating disc, which is located between the sealing cover and the protective cover and is provided with a sealing ring. The compensating disc is for the metal bellows mechanical seal to pass through and is used to fit the metal bellows mechanical seal. A sealing ring is provided between the inner ring of the compensating disc and the metal bellows mechanical seal. The protective cover and the compensating disc are fixedly mounted on the opening end face of the sealing cover by bolts.

[0010] Optionally, it also includes auxiliary bushings for fitting a simulated valve stem, wherein multiple auxiliary bushings are provided and fitted together, and the fitting surface of the auxiliary bushings is provided with a sealing ring.

[0011] Optionally, the auxiliary bushing has stepped grooves on both its inner and outer sides, the stepped grooves abutting against each other, and the sealing ring is located at the abutting point of the stepped grooves.

[0012] Optionally, the inner side of the auxiliary bushing has a keyhole, and the outer side of the auxiliary bushing has a keyway corresponding to the keyhole. It also includes a fixing pin, which is used to insert into the keyhole and the keyway to connect the inner and outer auxiliary bushings.

[0013] Optionally, the fixed end of the metal bellows mechanical seal is fixed to the compensating disc by bolts.

[0014] Optionally, the driving component includes a drive motor, a reducer, and a linkage drive device mounted on the test frame. The reducer is mounted on the output shaft of the drive motor, and the linkage drive device is used to connect to the simulated valve stem. The linkage drive device is mounted on the output shaft of the reducer.

[0015] Optionally, the test frame is provided with multiple support columns, and the support columns are provided with support bearings, with the simulated valve stem sleeved inside the support bearings.

[0016] Optionally, a round nut is provided at the end of the simulated valve stem, which is used to fix the auxiliary bushing to the simulated valve stem.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. When testing the sealing performance of a metal bellows seal, the metal bellows mechanical seal is installed on a simulated valve stem, and a sealing cover is fitted inside the metal bellows mechanical seal to simulate the valve body sealing chamber. Then, the test medium is injected into the sealing cover, and the simulated valve stem is rotated by a drive component to simulate the opening and closing of a butterfly valve. During this process, when the test pressure inside the sealing cover drops, it indicates that there is a leak in the metal bellows mechanical seal, which facilitates the testing of the sealing performance of the metal bellows mechanical seal. The operation is simple and convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an experimental device for sealing bellows pipes for intermediate pressure valves of nuclear power plant steam turbines, according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the valve stem and sealing cover in an experimental device for bellows sealing a medium-pressure valve of a nuclear power plant steam turbine, according to an embodiment of this application.

[0021] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle;

[0022] Figure 4 This is a schematic diagram of the compensation disc and protective cover in an experimental device for sealing a bellows valve of a nuclear power plant steam turbine, according to an embodiment of this application.

[0023] Figure 5 yes Figure 4 Enlarged diagram of part B.

[0024] Explanation of reference numerals in the attached drawings: 1. Test frame; 2. Simulated valve stem; 3. Drive component; 31. Drive motor; 32. Reducer; 33. Linkage drive device; 4. Sealing cover; 5. Metal bellows mechanical seal; 6. Inlet pipe; 7. Outlet pipe; 8. Protective cover; 9. Compensation disc; 10. Sealing ring; 11. Auxiliary bushing; 12. Stepped groove; 13. Keyhole; 14. Keyway; 15. Fixing pin; 16. Support bearing; 17. Round nut. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0026] This application discloses an experimental apparatus for sealing bellows in the intermediate-pressure valve of a nuclear power plant steam turbine. (Refer to...) Figure 1 The experimental device for bellows sealing of intermediate pressure valves in nuclear power plant steam turbines includes a test frame 1. The test frame 1 is equipped with a simulated valve stem 2, a drive component 3, and a sealing cover 4. A metal bellows mechanical seal 5 is installed on the simulated valve stem 2. The drive component 3 drives the simulated valve stem 2 to rotate, simulating the opening and closing of a butterfly valve. The sealing cover 4 is fixedly installed on the test frame 1 and surrounds the metal bellows mechanical seal 5. A seal is formed between the simulated valve stem 2 and the sealing cover 4. The sealing cover 4 has an opening, and the metal bellows mechanical seal 5 is sealed at the opening of the sealing cover 4. The sealing cover 4 is equipped with an inlet pipe 6 and an outlet pipe 7. The inlet pipe 6 is used to inject the test medium into the sealing cover 4, and the outlet pipe 7 is used to discharge the test medium from the sealing cover 4.

[0027] When testing the sealing performance of a metal bellows seal, the metal bellows mechanical seal 5 is installed on the simulated valve stem 2, and the sealing cover 4 is fitted inside the metal bellows mechanical seal 5 to simulate the valve body sealing chamber. Then, the test medium is injected into the sealing cover 4, and the simulated valve stem 2 is rotated by the driving component 3 to simulate the opening and closing of the butterfly valve. During this process, when the test pressure inside the sealing cover 4 drops, it indicates that there is a leak in the metal bellows mechanical seal 5, which facilitates the testing of the sealing performance of the metal bellows mechanical seal 5. The operation is simple and convenient.

[0028] Reference Figure 2 In this embodiment, a protective cover 8 is also included. The protective cover 8 is fixedly disposed on the open end face of the sealing cover 4. A sealing ring 10 is provided between the protective cover 8 and the sealing cover 4. An exhaust pipe is provided on the protective cover 8, which is used to connect the test piece of the test medium. After the protective cover 8 is fastened inside the sealing cover 4, the sealing surface of the metal bellows mechanical seal 5 is located inside the sealing cover 4, while the rear end is located inside the protective cover 8. When the metal bellows mechanical seal 5 leaks, the medium flows through the sealing surface into the protective cover 8, and then through the exhaust pipe. The leaked medium is measured through the test piece. The operation is simple and convenient.

[0029] Reference Figure 2 and Figure 3 In this embodiment, a compensation disc 9 is also included. The compensation disc 9 is located between the sealing cover 4 and the protective cover 8 and is provided with a sealing ring 10. The compensation disc 9 allows the metal bellows mechanical seal 5 to pass through and is used to fit the metal bellows mechanical seal 5. A sealing ring 10 is provided between the inner ring of the compensation disc 9 and the metal bellows mechanical seal 5. The protective cover 8 and the compensation disc 9 are fixedly mounted on the open end face of the sealing cover 4 by bolts. The outer diameter of the metal bellows mechanical seal 5 is compensated by the compensation disc 9, so as to adapt to the diameter of the sealing cover 4 and the metal bellows mechanical seal 5, thereby facilitating the sealing between the metal bellows mechanical seal 5 and the sealing cover 4.

[0030] Reference Figure 4 and Figure 5 In this embodiment, an auxiliary bushing 11 for fitting the simulated valve stem 2 is also included. Multiple auxiliary bushings 11 are provided and interlocked, with a sealing ring 10 on the fitting surface of each auxiliary bushing 11. Because the inner diameter of the simulated valve stem 2 is small, installing the metal bellows mechanical seal 5 onto the simulated valve stem 2 is relatively difficult. Therefore, when installing the metal bellows mechanical seal 5, the auxiliary bushings 11 are first installed according to the diameter of the simulated valve stem 2, and then the metal bellows mechanical seal 5 is fitted onto the auxiliary bushings 11, which facilitates the installation of the metal bellows mechanical seal 5. Furthermore, the sealing ring 10 reduces the possibility of leakage of the test medium through the gaps between the auxiliary bushings 11, thereby improving the test accuracy.

[0031] Reference Figure 4 and Figure 5 To facilitate the installation of the sealing rings 10 between the auxiliary bushings 11, stepped grooves 12 are provided on both the inner and outer sides of the auxiliary bushings 11. The stepped grooves 12 abut against each other, and the sealing rings 10 are located at the abutment of the stepped grooves 12.

[0032] Reference Figure 4 and Figure 5 In this embodiment, the inner auxiliary bushing 11 has a keyhole 13 on its inner side, and the outer auxiliary bushing 11 has a keyway 14 corresponding to the keyhole 13. It also includes a fixing pin 15, which is used to insert the keyhole 13 and the keyway 14 to connect the inner and outer auxiliary bushings 11. Under the action of the fixing pin 15, it is easy to fix the auxiliary bushing 11 to the simulated valve stem 2, and it is easy to transmit the rotation trend of the simulated valve stem 2 to the auxiliary bushing 11 and then to the metal bellows mechanical seal 5.

[0033] Reference Figure 4 In this embodiment, the fixed end of the metal bellows mechanical seal 5 is fixedly mounted on the compensation disc 9 by bolts.

[0034] Reference Figure 1 In this embodiment, the driving component 3 includes a drive motor 31, a reducer 32, and a connecting rod drive device 33 mounted on the test frame 1. The reducer 32 is mounted on the output shaft of the drive motor 31. The connecting rod drive device 33 is used to connect to the simulated valve stem 2. The connecting rod drive device 33 includes a sleeve, a connecting rod, and a bolt. The sleeve is used to connect to the input shaft, the connecting rod is fixedly mounted on the sleeve, and the bolt is used to fix and connect the connecting rod. The power source of the drive motor 31 is transmitted to the connecting rod drive device 33 after being reduced by the reducer 32, and drives the simulated valve stem 2 to rotate. The operation is simple and convenient.

[0035] Reference Figure 1 In this embodiment of the application, the test frame 1 is provided with multiple support columns, and support bearings 16 are provided on the support columns. The simulated valve stem 2 is sleeved in the support bearings 16. Under the action of the support bearings 16, the simulated valve stem 2 is supported, reducing the possibility of the simulated valve stem 2 shifting due to its length, and facilitating the testing of the sealing performance of the metal bellows mechanical seal 5.

[0036] Reference Figure 2 In this embodiment of the application, a round nut 17 is provided at the end of the simulated valve stem 2. The round nut 17 is used to fix the auxiliary bushing 11 to the simulated valve stem 2.

[0037] The implementation principle of the bellows sealing test device for the intermediate pressure valve of a nuclear power plant steam turbine according to an embodiment of this application is as follows:

[0038] A drive motor 31 drives a reducer 32 to rotate, which is connected to the simulated valve stem 2 (part 4) via a connecting rod drive device 33. Two sets of bearing assemblies provide positioning and support for the simulated valve stem 2. The sealing cover 4 and the protective cover 8 are installed independently, simulating the valve body sealing chamber. They are equipped with a test medium inlet pipe 6 and an outlet pipe 7 for the input and discharge of the test medium (superheated steam). The protective cover 8 prevents high-temperature steam from escaping and causing accidents, and can also collect leaks for easy measurement of the leakage of the metal bellows mechanical seal 5.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bellows sealing test device for intermediate pressure valves in nuclear power plant steam turbines, characterized in that: The test frame (1) includes a simulated valve stem (2), a drive unit (3), and a sealing cover (4). A metal bellows mechanical seal (5) is installed on the simulated valve stem (2). The drive unit (3) is used to drive the simulated valve stem (2) to rotate and simulate the opening and closing of a butterfly valve. The sealing cover (4) is fixedly installed on the test frame (1) and is used to surround the metal bellows mechanical seal (5). The simulated valve stem (2) and the sealing cover (4) are sealed together. The sealing cover (4) has an opening. The metal bellows mechanical seal (5) is sealed at the opening of the sealing cover (4). The sealing cover (4) is provided with an air inlet pipe (6) and an air outlet pipe (7). The air inlet pipe (6) is used to inject the test medium into the sealing cover (4), and the air outlet pipe (7) is used to discharge the test medium from the sealing cover (4).

2. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 1, characterized in that: It also includes a protective cover (8), which is fixedly installed on the open end face of the sealing cover (4). A sealing ring (10) is provided between the protective cover (8) and the sealing cover (4). An exhaust pipe is provided on the protective cover (8), which is used to connect the test piece of the test medium.

3. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 2, characterized in that: It also includes a compensation disc (9), which is located between the sealing cover (4) and the protective cover (8) and is provided with a sealing ring (10). The compensation disc (9) is for the metal bellows mechanical seal (5) to pass through and is used to fit the metal bellows mechanical seal (5). A sealing ring (10) is provided between the inner ring of the compensation disc (9) and the metal bellows mechanical seal (5). The protective cover (8) and the compensation disc (9) are fixedly installed on the opening end face of the sealing cover (4) by bolts.

4. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 1, characterized in that: It also includes auxiliary bushings (11) for fitting the simulated valve stem (2), wherein multiple auxiliary bushings (11) are provided and fitted together, and the fitting surface of the auxiliary bushings (11) is provided with a sealing ring (10).

5. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 4, characterized in that: The auxiliary bushing (11) is provided with stepped grooves (12) on both the inner and outer sides, the stepped grooves (12) abutting against each other, and the sealing ring (10) is located at the abutting point of the stepped grooves (12).

6. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 4, characterized in that: The inner side of the auxiliary bushing (11) has a keyhole (13) and the outer side of the auxiliary bushing (11) has a keyway (14) corresponding to the keyhole (13). It also includes a fixing pin (15) for inserting into the keyhole (13) and the keyway (14) to connect the inner and outer auxiliary bushings (11).

7. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 3, characterized in that: The fixed end of the metal bellows mechanical seal (5) is fixed on the compensation disc (9) by bolts.

8. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 1, characterized in that: The drive unit (3) includes a drive motor (31), a reducer (32) and a linkage drive device (33) mounted on the test frame (1). The reducer (32) is mounted on the output shaft of the drive motor (31). The linkage drive device (33) is used to connect the simulated valve stem (2). The linkage drive device (33) is mounted on the output shaft of the reducer (32).

9. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 1, characterized in that: The test frame (1) is provided with multiple support columns, and the support columns are provided with support bearings (16). The simulated valve stem (2) is sleeved in the support bearings (16).

10. The bellows sealing test device for intermediate pressure valve of nuclear power plant steam turbine according to claim 5, characterized in that: The simulated valve stem (2) is provided with a round nut (17) at its end, which is used to fix the auxiliary bushing (11) to the simulated valve stem (2).

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