Sealing test device for ventilation system of nuclear power plant

Abstract

The utility model discloses a nuclear power plant ventilation system sealing performance test device comprising a test tank body, a first port of the test tank body is circular, and an opposite second port is square; the round flange assembly is matched and sealed at the first port of the test tank body; the square flange assembly is matched and sealed at the second port of the test tank body; the heating assembly is assembled on the test tank body and is used for heating the inner cavity of the test tank body; the test tank body is provided with an inflation port, a pressure measuring piece or a pressure measuring port for installing the pressure measuring piece, and a temperature measuring piece or a temperature measuring port for installing the temperature measuring piece. The device is suitable for the sealing test of a sealing gasket, a pipeline and the like of a ventilation system; through the arrangement of the test tank body and the inflation inlet and the heating assembly on the test tank body, different pressures, temperatures and the like of normal working conditions and limiting working conditions of the nuclear power plant ventilation system can be simulated to detect the sealing performance and the limiting working conditions, and the leakage rate of the system is conveniently researched and analyzed.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power sealing tests, in particular to a nuclear power plant ventilation system sealing test device. Background Art

[0002] The ventilation and air conditioning system piping in nuclear power plants frequently suffers from leaks, with leaks primarily concentrated at flange (pipeline or equipment) connections. Leaks are particularly severe in the high-temperature sections of the emergency iodine circuit. Based on the ventilation system's on-site requirements, leaking gaskets must be replaced or a plugging and wrapping solution implemented. To prevent frequent leaks after repairs, various gasket types undergo sealing performance testing before replacement. After repairs, pipeline pressure maintenance is used to verify the quality of the replaced gaskets or plugging and wrapping to ensure they meet the system's leakage rate requirements.

[0003] The sealing gaskets of the ventilation and air-conditioning system of a nuclear power plant need to pass benchmark tests and inspections, extreme operating conditions tests (extreme operating conditions under installation conditions), aging performance tests (thermal aging, radiation aging), and functional tests (sealing performance). Therefore, it is necessary to develop test equipment to verify that the sealing performance meets the corresponding technical requirements. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a nuclear power plant ventilation system sealing test device.

[0005] The technical solution adopted by the utility model to solve the technical problem is to provide a nuclear power plant ventilation system sealing test device, including:

[0006] A test tank body, wherein the first port of the test tank body is circular and the opposite second port is square;

[0007] a round flange assembly, adapted to seal against the first port of the test tank;

[0008] a square flange assembly adapted to seal against the second port of the test tank; and

[0009] A heating assembly, mounted on the test tank body, for heating the inner cavity of the test tank body;

[0010] The test tank body is provided with an air filling port, a pressure measuring piece or a pressure measuring port for installing the pressure measuring piece, and a temperature measuring piece or a temperature measuring port for installing the temperature measuring piece.

[0011] Preferably, a test position for placing a sealing gasket to be tested is formed between the circular flange assembly and the first port of the test tank body.

[0012] Preferably, a test position for placing a sealing gasket to be tested is formed between the square flange assembly and the second port of the test tank.

[0013] Preferably, the first port or the second port of the test tank forms a test docking side for docking with a system to be tested or a pipeline to be tested.

[0014] Preferably, the test tank is provided with a safety valve.

[0015] Preferably, the heating assembly includes at least one electric heating rod, and the electric heating rod is inserted into the test tank.

[0016] Preferably, a first handle is provided on the surface of the circular flange assembly facing away from the test tank body.

[0017] Preferably, a second handle is provided on the surface of the square flange assembly facing away from the test tank body.

[0018] Preferably, the nuclear power plant ventilation system sealing test device further comprises:

[0019] A mobile trolley is provided on which the test tank is mounted via a bracket.

[0020] Preferably, the test tank is placed horizontally.

[0021] The beneficial effects of the utility model are as follows: it is suitable for sealing tests of sealing gaskets, pipes, etc. of ventilation systems; through the setting of the test tank body and the air filling port and heating components on it, it can simulate the different pressures, temperatures, etc. of normal working conditions and extreme working conditions of the ventilation system of a nuclear power plant, and carry out sealing performance and extreme working condition tests, which is convenient for studying and analyzing whether the leakage rate of the system is within the normal range; the overall structure and maintenance are simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0023] Figure 1 The utility model is a structural schematic diagram of a nuclear power plant ventilation system sealing test device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0025] like Figure 1 As shown, a nuclear power plant ventilation system sealing test device according to an embodiment of the present invention may include a test tank body 10, a round flange assembly 20 and a square flange assembly 30 for sealing both ends of the test tank body 10, and a heating assembly for heating the test tank body 10.

[0026] The internal chamber of the test tank 10 serves as an air chamber for pressurization during testing. The test tank 10 has two opposing ports, a first port and a second port. The first port is circular, adapted to fit and seal the round flange assembly 20 thereon. The second port is square, adapted to fit and seal the square flange assembly 30 thereon, thereby forming a sealed test tank 10.

[0027] The two ports of the test tank 10 are configured in different shapes. The structure can be formed by connecting a circular air duct 101 and a square-shaped air duct 102. Specifically, the square-shaped air duct 102 is a duct with one circular end and the other square end. The circular end of the square-shaped air duct 102 connects to the circular air duct 101. The square end of the square-shaped air duct 102 forms the second port of the test tank 10, and the end of the circular air duct 101 away from the square-shaped air duct 102 forms the first port of the test tank 10.

[0028] The test tank body 10 is provided with an air filling port 11 for connecting to an air filling device. The air filling device fills compressed air into the test tank body 10 through the air filling port 11 so that the internal pressure of the test tank body 10 reaches the pressure required for the test.

[0029] The test tank 10 is provided with a pressure measuring member 12 for monitoring the pressure within the test tank 10. Alternatively, a pressure measuring port is provided on the test tank 10 for mounting the pressure measuring member 12, and the pressure within the test tank 10 is monitored via the pressure measuring member 12. The pressure measuring member 12 may be, but is not limited to, a pressure gauge, preferably a local pressure gauge.

[0030] The test tank body 10 is also provided with a temperature measuring element for monitoring the temperature inside the test tank body 10. Alternatively, a temperature measuring port 13 is provided on the test tank body 10 for installing a temperature measuring element, and the temperature inside the test tank body 10 is monitored by the temperature measuring element. The temperature measuring element may be, but is not limited to, a thermometer or a thermocouple. Preferably, Figure 1 The test tank body 10 shown is provided with three temperature measuring ports 13 , one temperature measuring port 13 is close to the first port, one temperature measuring port 13 is close to the second port, and another temperature measuring port 13 is located in the middle of the test tank body 10 .

[0031] To improve safety, the test tank body 10 is further provided with a safety valve 14 which opens to release pressure when the pressure inside the test tank body 10 exceeds a specified value.

[0032] The circular flange assembly 20 further includes a circular flange 21 and a circular flange cover 22. The circular flange 21 is configured to fit over the first port of the test tank 10 and be secured thereto via fasteners. The circular flange cover 22 is configured to fit over the circular flange 21 and seal it. A sealing gasket further seals the circular flange 21 and the first port of the test tank 10. During a leak-tightness test of a circular sealing gasket, the circular flange 21 and the first port of the test tank 10 form a test position for the sealing gasket to be tested.

[0033] Alternatively, a first handle 23 may be provided on the surface of the circular flange cover 22 of the circular flange assembly 20 facing away from the test tank body 10 for taking or placing the circular flange cover 22 or the entire circular flange assembly 20 .

[0034] The square flange assembly 30 may further include a square flange 31 and a square flange cover 32. The square flange 31 is adapted to fit over the second port of the test tank 10 and be secured thereto via fasteners. The square flange cover 32 is adapted to fit over the square flange 31 and seal it. A sealing gasket further seals the square flange 31 and the second port of the test tank 10. During a seal test of a square sealing gasket, the square flange 31 and the second port of the test tank 10 form a test position for placing the sealing gasket to be tested.

[0035] Alternatively, a second handle 33 may be provided on the surface of the square flange cover 32 of the square flange assembly 30 facing away from the test tank body 10 for taking or placing the square flange cover 32 or the entire square flange assembly 30 .

[0036] The heating assembly is mounted on the test tank 10 and is used to heat the interior of the test tank 10. It is preferably an electric heating assembly. The heating assembly further includes at least one electric heating rod 40, which is inserted into the test tank 10. The terminal of the electric heating rod 40 is located outside the test tank 10 for connection to the electrical control box 50 or power supply.

[0037] The nuclear power plant ventilation system sealing test device of the present invention is not only suitable for sealing or pressure testing of circular or square sealing gaskets, but also for sealing or pressure testing of fixed locations or pipelines in systems with sealing requirements, such as nuclear power ventilation systems. When used for sealing testing of a system or pipeline, the first port or the second port of the test tank body 10 is sealedly docked with the system or pipeline under test. To this end, the first port or the second port of the test tank body 10 forms a test docking side for docking with the system or pipeline under test.

[0038] Furthermore, to achieve the mobility of the sealing test device and facilitate its application in multiple occasions, the nuclear power plant ventilation system sealing test device also includes a mobile trolley 60, and the test tank body 10 is mounted on the mobile trolley 60 via a bracket 61. On the mobile trolley 60, the test tank body 10 is placed horizontally.

[0039] The nuclear power plant ventilation system sealing test device of the present invention may further include an electric control box 50 . The electric control box 50 may be positioned on a mobile vehicle 60 and located below the test tank 10 .

[0040] The utility model of the nuclear power plant ventilation system sealing test device is used for sealing gasket testing:

[0041] Depending on whether the gasket to be tested is round or square, it is placed at the first or second port of the test tank. The ends of the test tank are sealed and compressed using a round flange assembly and a square flange assembly, respectively. The gasket to be tested is compressed by 20%. The bolts between the port and the flange assembly are fixed. The inflation valve of the pressure device is opened and compressed air is introduced into the test tank. When the pressure in the test tank reaches 0.022 MPa, the pressure is stopped, the inflation valve is closed, and the pressure is maintained at 90°C for 2 hours.

[0042] The compression of the sealing gasket to be tested is increased to 30%, and after maintaining the pressure at 0.022 MPa at room temperature for 48 hours, the pressure value of the pressure gauge is observed to see if it fluctuates. If the pressure value does not change after 48 hours of pressure maintenance, the electric heating rod 40 inside the test tank is energized for testing, and the inside of the test tank is heated to 80°C, and the heating is continued for 24 hours, and the pressure of the test tank is recorded once. The heating is continued for another 72 hours, and the pressure of the test tank is recorded once. There is no change in the pressure of the test tank after the two pressure stabilization tests.

[0043] Increase the compression of the tested sealing gasket to 40% and maintain the pressure at 90°C for 2 hours.

[0044] After maintaining the pressure, observe the changes in the pressure value of the pressure gauge. If there is any change, it means that the seal is leaking and it is judged as unqualified.

[0045] During the test, the compression of the sealing gasket to be tested is controlled by a plug gauge.

[0046] The allowable temperature fluctuation range is ±3°C, and the allowable pressure gauge fluctuation range is +2KPa.

[0047] In the above-mentioned sealing gasket test, the sealing gasket to be tested is installed at one end of the test tank, and the other end is sealed with a sealing gasket that meets the sealing requirements.

[0048] When the nuclear power plant ventilation system sealing test device of the present invention is used for system fixed point position or pipeline testing, the operation can refer to the above operation process.

[0049] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A nuclear power plant ventilation system sealing test device, characterized in that: include: A test tank body, wherein the first port of the test tank body is circular and the opposite second port is square; a round flange assembly, adapted to seal against the first port of the test tank; a square flange assembly adapted to seal against the second port of the test tank; and A heating assembly, mounted on the test tank body, for heating the inner cavity of the test tank body; The test tank body is provided with an air filling port, a pressure measuring piece or a pressure measuring port for installing the pressure measuring piece, and a temperature measuring piece or a temperature measuring port for installing the temperature measuring piece.

2. The nuclear power plant ventilation system sealing test device according to claim 1, characterized in that: A test position for placing a sealing gasket to be tested is formed between the circular flange assembly and the first port of the test tank body.

3. The nuclear power plant ventilation system sealing test device according to claim 1, characterized in that: A test position for placing a sealing gasket to be tested is formed between the square flange assembly and the second port of the test tank.

4. The nuclear power plant ventilation system sealing test device according to claim 1, characterized in that: The first port or the second port of the test tank forms a test docking side for docking with a system to be tested or a pipeline to be tested.

5. The nuclear power plant ventilation system sealing test device according to claim 1, characterized in that: The test tank body is provided with a safety valve.

6. The nuclear power plant ventilation system sealing test device according to claim 1, characterized in that: The heating assembly includes at least one electric heating rod, and the electric heating rod is inserted into the test tank.

7. The nuclear power plant ventilation system sealing test device according to claim 1, characterized in that: A first handle is provided on the surface of the circular flange assembly facing away from the test tank body.

8. The nuclear power plant ventilation system sealing test device according to claim 1, characterized in that: The surface of the square flange assembly facing away from the test tank body is provided with a second handle.

9. The nuclear power plant ventilation system sealing test device according to any one of claims 1 to 8, characterized in that: The nuclear power plant ventilation system sealing test device also includes: A mobile trolley is provided on which the test tank is mounted via a bracket.

10. The nuclear power plant ventilation system sealing test device according to claim 9, characterized in that: The test tank is placed horizontally.

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