Integrated plugging device for nuclear power evaporator main pump main pipeline

Abstract

The utility model discloses an integrated plugging device for a nuclear power evaporator main pump main pipeline, and belongs to the technical field of nuclear power evaporator plugging devices. According to the design scheme, an integrated design is adopted, so that an operator only needs to install a ring crane outside a main pipeline and a main pump during installation, the damage of irradiation to a human body is reduced, meanwhile, the use frequency of the ring crane is reduced, sealing is conducted from the side wall of the pump shell, and a sealing groove and a main bolt hole are not occupied after sealing; according to the scheme, metal and rubber are integrally vulcanized and processed, so that the process difficulty is low, the production yield is high, the defect invisible to naked eyes does not exist, the reliability is high, the service life is long, parts can be replaced at any time if damaged, and the cost is low. Operation is simple, and risks such as air pressure leakage do not exist.

Description

Technical Field

[0001] The utility model belongs to the technical field of nuclear power evaporator blocking devices, in particular to an integrated blocking device for a main pump and main pipeline of a nuclear power evaporator. Background Art

[0002] An inflatable sealing plug is used for sealing, which has poor reliability, short life, and the seals cannot be replaced individually. Once a groove is rotten, the air is inflated to a pressure of 0.6 MPa, which poses a risk to operators during cleaning. The sealing form of the inflatable sealing plug needs to be installed deep inside the main pipeline, evaporator, and main pump, resulting in a large radiation dose and great harm to the human body. Utility Model Content

[0003] The purpose of the utility model is to provide an integrated plugging device for the main pump and main pipeline of a nuclear power evaporator to solve the above-mentioned problems existing in the prior art.

[0004] Technical solution: An integrated sealing device for the main pipeline of the main pump of a nuclear power evaporator, comprising a pump casing body, a pump casing port arranged in the middle of the pump casing body, a bolt hanger arranged on the top of the pump casing port, a main sealing plate and a secondary sealing plate arranged in the middle of the pump casing port, a main sealing ring and a secondary sealing ring respectively arranged on both sides of the pipeline arranged between the main sealing plate and the secondary sealing plate, and the main sealing ring and the secondary sealing ring are respectively abutted against the inner wall of the pump casing body.

[0005] In a further embodiment, a lead shielding plate is provided on the main sealing plate.

[0006] In a further embodiment, a plurality of pressure fingers are provided on the top of the secondary sealing plate.

[0007] In a further embodiment, the pressure finger is connected to the pump casing body via a fixing bolt.

[0008] In a further embodiment, an intermediate flange is provided between the pipes.

[0009] In a further embodiment, a trapezoidal groove is provided at the intersection of the secondary sealing plate and the pump casing body.

[0010] In a further embodiment, a lifting ring is provided on the bolt hanger. Beneficial effects

[0011] This design adopts an integrated design so that during installation, the operator can use a ring crane to install it outside the main pipeline and main pump, reducing the harm of radiation to the human body and reducing the frequency of use of the ring crane. This design seals from the side wall of the pump casing. After sealing, the sealing groove and main bolt hole are not occupied, and the pump casing fastening and sealing system (double sealing grooves, main bolt holes) can be cleaned. At the same time, the high head pressure of the primary circuit system is sealed. This solution adopts metal and rubber integrated vulcanization processing, which has low process difficulty, high production yield and no defects invisible to the naked eye. It has strong reliability and long service life. If the parts are damaged, they can be replaced at any time. The operation is simple and there is no danger of air pressure leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view of the present utility model.

[0013] Figure 2 This is view A of the present invention.

[0014] Figure 3 It is a top view of the present utility model.

[0015] The accompanying drawings are marked as follows: 1. fixing bolt; 2. bolt hanger; 3. intermediate flange; 4. secondary sealing plate; 5. pressure finger; 6. secondary sealing ring; 7. main sealing ring; 8. main sealing plate; 9. lead shielding plate; 10. pump casing body; 11. pump casing port; 12. trapezoidal groove; 13. lifting ring. DETAILED DESCRIPTION

[0016] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention.

[0017] It will be apparent, however, to one skilled in the art that the present invention may be practiced without one or more of these details.

[0018] In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0019] like Figure 1-Figure 3 As shown, an integrated sealing device for the main pump and main pipeline of a nuclear power evaporator consists of a fixing bolt 1, a bolt hanger 2, an intermediate flange 3, a secondary sealing plate 4, a pressure finger 5, a secondary sealing ring 6, a main sealing ring 7, a main sealing plate 8, a lead shielding plate 9, a pump casing body 10, a pump casing port 11, a trapezoidal groove 12, and a lifting ring 13.

[0020] A pump casing port 11 is provided in the middle of the pump casing body 10, a bolt hanger 2 is provided on the top of the pump casing port 11, a main sealing plate 8 and a secondary sealing plate 4 are provided in the middle of the pump casing port 11, and a main sealing ring 7 and a secondary sealing ring 6 are provided on both sides of the pipeline provided between the main sealing plate 8 and the secondary sealing plate 4, respectively. The main sealing ring 7 and the secondary sealing ring 6 are against the inner wall of the pump casing body 10.

[0021] A lead shielding plate 9 is provided on the main sealing plate 8 .

[0022] A plurality of pressure fingers 5 are provided on the top of the secondary sealing plate 4 .

[0023] The pressure finger 5 is connected to the pump housing body 10 via a fixing bolt 1 .

[0024] An intermediate flange 3 is provided between the pipes.

[0025] A trapezoidal groove 12 is provided at the intersection of the secondary sealing plate 4 and the pump casing body 10 .

[0026] A lifting ring 13 is provided on the bolt hanger 2 .

[0027] 1. To solve the problem that the inflatable sealing plug needs to be folded into a roll and inserted into the main pipeline or pump casing pipeline for installation, which poses a great risk to personnel, an integrated design solution is adopted for the sealing design.

[0028] 2. To address the issue of leaving the sealing groove and main bolt hole end faces exposed, the sealing solution uses an axial rubber extrusion seal, which utilizes the side walls of the main line evaporator, main pipeline, and pump casing for sealing. This seal leaves the sealing groove and main bolt hole completely exposed.

[0029] 3. The sealing solution improves the safety, stability, and effectiveness of nuclear power. It adopts a three-seal design. The first seal is the main seal, which plays the role of the main seal. The second seal is the secondary seal. When the main seal leaks, the secondary seal can still play a sealing role under the leakage pressure. At the same time, there is a pressure test pipeline between the main seal and the secondary seal. When the main seal leaks, there will be a signal prompt. If the axial force fails, we also have a trapezoidal groove 12 seal, which can resist the leaking pressure water even if the axial force completely fails. Therefore, between the main seal and the secondary seal, and between the secondary seal and the trapezoidal groove 12 seal, we have added pressure sensors to monitor whether the entire seal is in an effective operating state.

[0030] 4. In order to save the time of ring lifting, the main bolt bracket and the sealing system are designed to be integrated. The main bolt bracket and the sealing system can be placed together above the main pipeline. After cleaning, the bolt bracket and the sealing system can be lifted out of the nuclear island together. At the same time, the sealing system has a built-in lead shielding layer to shield the primary circuit from radiation.

[0031] The hardware of this sealing system solution is divided into two systems:

[0032] The integrated sealing system consists of a rubber seal, metal plywood, and a lead shield. The integrated sealing gasket is vulcanized with radiation-resistant EPDM rubber. The primary seal ring 7 is constructed with 70A Shore hardness rubber, and the secondary seal ring is constructed with 60A Shore hardness rubber. These two rubbers form two annular seals (primary and secondary). The softer secondary seal ring 6 is preloaded before the main seal ring 7 is tightened. The disc spring compresses the primary and secondary seal rings 6. A passive sealing T-slot is designed at the contact point between the pump casing end face and the seal, housing a rectangular seal ring. This seal maintains a seal under a pressure of 0.2 MPa even if the primary or secondary seal ring 6 fails. This sealing system can be tightened by tightening bolts to clamp the primary seal plate 8, intermediate flange 3, and secondary seal plate 4. The primary and secondary seals deform to form a sealing surface with the pump casing sidewall, effectively sealing the system.

[0033] The main sealing plate 8, intermediate flange 3, and auxiliary sealing plate 4 are integrally machined from high-strength martensitic stainless steel (Rm ≥ 750MPa). During use, they are inserted into the pump casing sealing groove and compressed by the pressure finger 5. They can withstand a pressure of 0.35MPa and can withstand temperatures up to 80°C for extended periods, but not exceeding 120°C for short periods. If the sealing gasket is intact, it can be reused multiple times. If mechanical damage is found, the sealing gasket can be replaced at any time, and the blind plate and shielding material can still be used continuously.

[0034] A lead shielding plate 9 (two layers of 5mm thick lead plates) is mounted on the back of the main sealing plate 8 and riveted into the groove of the main sealing bottom plate (the groove depth is consistent with the thickness of the lead plate). After riveting, it is level with the lower part of the main sealing bottom plate.

[0035] The integrated sealing gasket and lead shielding material of the plugging and sealing system have been assembled before hoisting, so there is no need to install and debug near the pump casing, reducing the radiation dose of personnel during installation;

[0036] If the plugging and sealing system is damaged, it can be directly replaced. The plugging and sealing system, sealing fastening system and shielding materials can be used for a long time;

[0037] The system features a multi-faceted anti-misoperation design, with different bolt types used for the primary and secondary seals. The primary tightening bolts are equipped with tightening indicator lights.

[0038] During installation, personnel can operate outside the pump casing to reduce the radiation dose absorbed by operators;

[0039] Each sealing plate and the middle flange 3 of the plugging and sealing system are integrally processed with vertical ribs, which can reduce deformation under water pressure and further reduce the weight of the plugging and sealing system;

[0040] All nut parts of the sealing system are processed in one piece to avoid the risk of falling off caused by welding;

[0041] How it works

[0042] This design adopts an integrated design so that during installation, the operator can use a ring crane to install it outside the main pipeline and main pump, reducing the harm of radiation to the human body and reducing the frequency of use of the ring crane. This design seals from the side wall of the pump casing. After sealing, the sealing groove and main bolt hole are not occupied, and the pump casing fastening and sealing system (double sealing grooves, main bolt holes) can be cleaned. At the same time, the high head pressure of the primary circuit system is sealed. This solution adopts metal and rubber integrated vulcanization processing, which has low process difficulty, high production yield and no defects invisible to the naked eye. It has strong reliability and long service life. If the parts are damaged, they can be replaced at any time. The operation is simple and there is no danger of air pressure leakage.

[0043] In the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0044] The standard parts used in this utility model can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0045] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated plugging device for a main pump main pipeline of a nuclear power evaporator, comprising a pump casing body (10), characterized in that: A pump casing port (11) is provided in the middle of the pump casing body (10), a bolt hanger (2) is provided on the top of the pump casing port (11), a main sealing plate (8) and a secondary sealing plate (4) are provided in the middle of the pump casing port (11), a main sealing ring (7) and a secondary sealing ring (6) are provided on both sides of a pipeline provided between the main sealing plate (8) and the secondary sealing plate (4), and the main sealing ring (7) and the secondary sealing ring (6) are abutted against the inner wall of the pump casing body (10).

2. The integrated plugging device for the main pump and main pipeline of a nuclear power evaporator according to claim 1, characterized in that: A lead shielding plate (9) is provided on the main sealing plate (8).

3. The integrated plugging device for the main pump and main pipeline of a nuclear power evaporator according to claim 1, characterized in that: A plurality of pressure fingers (5) are provided on the top of the secondary sealing plate (4).

4. The integrated plugging device for the main pump and main pipeline of a nuclear power evaporator according to claim 3, characterized in that: The pressure finger (5) is connected to the pump casing body (10) via a fixing bolt (1).

5. The integrated plugging device for the main pump and main pipeline of a nuclear power evaporator according to claim 1, characterized in that: An intermediate flange (3) is provided between the pipelines.

6. The integrated plugging device for the main pump and main pipeline of a nuclear power evaporator according to claim 1, characterized in that: A trapezoidal groove (12) is provided at the intersection of the secondary sealing plate (4) and the pump casing body (10).

7. The integrated plugging device for the main pump and main pipeline of a nuclear power evaporator according to claim 1, characterized in that: A lifting ring (13) is provided on the bolt hanger (2).

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