Device for measuring performance of metal sealing ring for spent fuel storage under high temperature condition

Abstract

The invention relates to a device for measuring the performance of a metal sealing ring for spent fuel storage under a high-temperature condition. The device comprises a test container, double sealing rings, a heating assembly and leak detection equipment, the test container comprises a container body, a cover body and a partition plate; the cover body covers the container body and is in sealed connection with the container body through double sealing rings, so that an accommodating space is formed inside the container body; the partition plate is arranged in the containing space and divides the containing space into a first space and a second space which are independent of each other. The first space is close to the cover; the heating assembly is arranged in the second space; and the leakage detection equipment is communicated with the gap between the double sealing rings through the communication hole of the cover body. The double sealing rings are directly installed on the test container, the first space and the double sealing rings are heated through the heating assembly arranged in the second space, the real use condition of the spent fuel storage container is better met, leakage is measured in real time through the leakage detection equipment, the sealing performance of the double sealing rings under the use working condition is obtained, and the test efficiency is improved. And the measurement result is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel sealing performance measurement, and in particular to a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions. Background Art

[0002] Spent fuel, also known as irradiated nuclear fuel, is nuclear fuel that has been exposed to radiation and used, usually produced by nuclear reactors in nuclear power plants. Spent fuel has a high heat release rate. Therefore, the container storing spent fuel is in a high-temperature environment for a long time. Long-term use in a high-temperature environment will cause the performance of the container components to deteriorate, especially the metal sealing ring as a sealing component. According to relevant national regulations, standards and design requirements, the metal sealing ring is required to maintain good sealing performance when used in a long-term high-temperature environment. Therefore, corresponding test equipment is required to measure the sealing performance of the metal sealing ring after long-term use. Most existing test equipment needs to be equipped with large heating equipment. For example, the heating device heats the metal sealing ring and then installs it on the container for airtightness testing. This method cannot well reflect the actual scene when the metal sealing ring is used, resulting in deviations in the measured sealing performance. The above problems need to be solved urgently. Summary of the invention

[0003] The invention discloses a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions, aiming to solve the technical problems existing in the prior art.

[0004] The present invention adopts the following technical solutions:

[0005] The present invention provides a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions, comprising a test container, a double sealing ring, a heating component and a leak detection device; the test container comprises a container body, a cover body and a partition; the cover body is arranged on the container body and is sealed and connected through the double sealing ring to form a accommodating space inside; the partition is arranged in the accommodating space and divides the accommodating space into a first space and a second space that are independent of each other; the first space is close to the cover body; the heating component is arranged in the second space; the leak detection device is connected to the gap between the double sealing rings via the connecting hole of the cover body.

[0006] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, the heating assembly includes a heater, a first temperature measuring element, a second temperature measuring element and a heating controller; the heater is arranged in the second space; the first temperature measuring element is arranged in the first space and adjacent to the double sealing ring, and is used to measure the temperature of the double sealing ring; the second temperature measuring element is arranged in the second space and adjacent to the heater, and is used to measure the temperature of the heater; the heating controller is connected to the heater, the first temperature measuring element and the second temperature measuring element, and is used to control the heater according to the measurement values ​​of the first temperature measuring element and the second temperature measuring element.

[0007] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, a plurality of the first temperature measuring elements and a plurality of the second temperature measuring elements are included; the plurality of the first temperature measuring elements are evenly distributed along the inner circumference of the double sealing ring; and the plurality of the second temperature measuring elements are evenly distributed in the second space.

[0008] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, the leak detection equipment comprises a helium concentration sensor, a connecting pipe, and a helium mass spectrometer; the helium concentration sensor is used to measure the helium concentration in the first space;

[0009] The connecting pipe connects the connecting hole and the helium mass spectrometer.

[0010] The device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention comprises a plurality of helium concentration sensors; the plurality of helium concentration sensors are used at least to measure the helium concentration in the middle and bottom of the first space.

[0011] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, a gas filling port is provided on the wall of the test container corresponding to the first space for connecting an external helium pressure device.

[0012] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, the connecting pipe of the leak detection device is sealed and connected to the connecting hole through a sealing connector; the sealing connector is made of a metal material having a thermal expansion coefficient greater than that of the cover body, and is provided with a through passage therein, and comprises a head and an insertion portion; the head is larger in size than the connecting hole, is covered on the connecting hole, and is screwed to the cover body by bolts, and the head is sealed with the connecting hole through a sealing gasket; the insertion portion is connected to the head and is located in the connecting hole, and can abut against the inner wall of the connecting hole after heating; one end of the through passage is connected to the connecting pipe, and the other end is located in the connecting hole.

[0013] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, the bolt rod of the bolt includes a cylindrical portion and a threaded portion; the cylindrical portion is close to the nut of the bolt and is in clearance with the through hole of the head;

[0014] The sealing gasket is made of a material that can be deformed under pressure.

[0015] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, the sealing gasket is made of graphite.

[0016] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, the insertion portion is a truncated cone structure that gradually expands from one side connected to the head to the other side; the connecting hole is a conical hole connected to the insertion portion, and the inner wall of the connecting hole is in contact with the surface of the insertion portion.

[0017] In the device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention, the double sealing ring includes an inner sealing ring and an outer sealing ring; there is a gap between the side sealing ring and the outer sealing ring, and both are sealed and connected to the container body and the cover body.

[0018] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0019] The present invention mainly provides a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions. The device is based on directly installing a double sealing ring on a test container, and heating the first space and the double sealing ring with a heating component arranged in the second space. This is more in line with the actual use of the spent fuel storage container, and the leakage is measured in real time with a leak detection device to obtain the sealing performance of the double sealing ring under the use condition, and the measurement result is more accurate; thus, the service life of the sealing ring can be judged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0021] Figure 1 It is a schematic structural diagram of a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions according to the present invention;

[0022] Figure 2 For the present invention Figure 1 A local enlarged structural schematic diagram;

[0023] Figure 3It is a schematic structural diagram of the installation state of the sealing connector in a preferred embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Test container; 11. Container body; 12. Cover; 121. Connecting hole; 13. Partition; 14. Accommodating space; 141. First space; 142. Second space; 15. Inflating port; 16. Exhaust port; 2. Double sealing ring; 21. Inner sealing ring; 22. Outer sealing ring; 3. Heating assembly; 31. Heater; 32. First temperature measuring element; 33. Second temperature measuring element; 34. Heating controller; 4. Leak detection equipment; 41. Helium concentration sensor; 42. Connecting pipe; 43. Helium mass spectrometer; 5. Sealing connector; 51. Head; 511. Threaded hole; 52. Insertion part; 53. Sealing gasket; 54. Through passage; 6. Bolt; 61. Bolt rod; 611. Cylindrical part; 612. Threaded part; 62. Nut. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a magnetic connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically limited.

[0028] In the field of interventional medical device technology, the direction close to the operator is generally defined as the proximal end, and the direction away from the operator is defined as the distal end. The direction of the central axis of an object such as a cylinder or a tube is defined as the axial direction. The radial direction refers to the direction passing through the central axis in the radial plane, for example, the straight line direction along the diameter or radius, or the straight line direction perpendicular to the central axis.

[0029] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to solve the problems existing in the prior art, an embodiment of the present application provides a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions.

[0031] like Figure 1 As shown, a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions comprises a test container 1, a double sealing ring 2, a heating assembly 3 and a leak detection device 4; the test container 1 comprises a container body 11, a cover 12 and a partition 13; the cover 12 is covered on the container body 11 and is sealed and connected through the double sealing ring 2 to form a receiving space 14 inside; the partition 13 is arranged in the receiving space 14 and divides the receiving space 14 into a first space 141 and a second space 142 which are independent of each other; the first space 141 is close to the cover 12; the heating assembly 3 is arranged in the second space 142; the leak detection device 4 is connected to the gap between the double sealing rings 2 through the connecting hole 121 of the cover 12; specifically, the double sealing ring 2 is a metal sealing ring; the leakage detection adopts the cladding vacuum method-gas detector method, and the leak detection device 4 is used to quickly measure the leakage rate of the double sealing ring 2; specifically, the leakage detection can be carried out with reference to the relevant contents of GB / T 17230-1998 "Leakage Inspection of Radioactive Material Safe Transport Packages".

[0032] The device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present invention is based on directly installing a double sealing ring on a test container, and heating the first space and the double sealing ring by a heating component arranged in the second space, which is more in line with the actual use of the spent fuel storage container, and the leakage is measured in real time by a leak detection device to obtain the sealing performance of the double sealing ring under the use condition, and the measurement result is more accurate; and then the service life of the sealing ring is judged, such as by continuously monitoring the change of the leakage rate.

[0033] In some preferred embodiments, the heating assembly 3 includes a heater 31, a first temperature measuring element 32, a second temperature measuring element 33 and a heating controller 34; the heater 31 is arranged in the second space 142; the first temperature measuring element 32 is arranged in the first space 141 and is adjacent to the double sealing ring 2, and is used to measure the temperature of the double sealing ring 2; the second temperature measuring element 33 is arranged in the second space 142 and is adjacent to the heater 31, and is used to measure the temperature of the heater 31; the heating controller 34 is connected to the heater 31, the first temperature measuring element 32 and the second temperature measuring element 33, and is used to measure the temperature of the heater 31 according to the measured values ​​of the first temperature measuring element 32 and the second temperature measuring element 33. The heater 31 is controlled, and the heater 31 is used to simulate the heat release of the spent fuel. Specifically, the power of the heater 31 is controlled according to the measurement value of the first temperature measuring element 32 until the first temperature measuring element 32 reaches the working temperature of the spent fuel storage container. The first temperature measuring element 32 is set adjacent to the double sealing ring 2, so that it can better reflect the real temperature of the double sealing ring 2 and make it closer to the actual working temperature. The temperature of the heater 31 is measured by the second temperature measuring element 33 to make it more consistent with the temperature of the spent fuel heat release. The heater 31 can be selected as an electric heater. The first temperature measuring element 32 and the second temperature measuring element 33 are temperature sensors, such as thermocouples, thermal resistors or other existing temperature measuring elements.

[0034] Preferably, the heating assembly 3 includes a plurality of first temperature measuring elements 32 and a plurality of second temperature measuring elements 33; the plurality of first temperature measuring elements 32 are evenly distributed along the circumference of the inner side of the double sealing ring 2, thereby more accurately measuring the temperature change of the double sealing ring 2, such as taking the average value of a plurality of measured values ​​as the measured value, and the temperature change of each part; the plurality of second temperature measuring elements 33 are evenly distributed in the second space 142; thereby, more accurately measuring the heat release temperature of the spent fuel and the temperature change of each part.

[0035] In some preferred embodiments, the leak detection device 4 includes a helium concentration sensor 41, a connecting pipe 42, and a helium mass spectrometer 43; the helium concentration sensor 41 is used to measure the helium concentration in the first space 141; the connecting pipe 42 connects the connecting hole 121 and the helium mass spectrometer 43; preferably, the connecting pipe 42 is a metal hose.

[0036] In some preferred embodiments, multiple helium concentration sensors 41 are included; the multiple helium concentration sensors 41 are used to measure the helium concentration in the middle and bottom of the first space 141 at least; based on the helium concentration measurements at the bottom and the middle respectively, this value is used as the helium concentration in the first space, and it is more accurate to substitute it into the following formula to convert the actual leakage rate.

[0037]

[0038] In the formula,

[0039] Q airIt is the leakage rate value under standard air conditions (standard atmospheric pressure, 25°C);

[0040] Q mix It is the value actually measured by helium mass spectrometer leak detector;

[0041] P mix is the pressure of the mixed gas (helium and air mixed gas) inside the first space 141;

[0042] P He is the helium partial pressure inside the first space 141;

[0043] μ air , μ He are the dynamic viscosities of air and helium, respectively;

[0044] Pu is the environmental pressure in the test;

[0045] Pd is the pressure between the two seal rings in the test;

[0046] P std is standard atmospheric pressure.

[0047] In some preferred embodiments, a filling port 15 is provided on the wall of the test container 1 corresponding to the first space 141 for connecting an external helium pressure device to fill the first space 141 with helium through the external helium pressure device to simulate the pressure conditions of the spent fuel storage container during operation.

[0048] Preferably, an exhaust port 16 is provided on the wall of the test container 1 corresponding to the first space 141 , and exhaust is discharged through the exhaust port 16 during the inflation process of the inflation port 15 , so that the helium concentration in the first space 141 can be controlled; specifically, both the inflation port 15 and the exhaust port 15 are provided with valves.

[0049] In some preferred embodiments, Figure 2As shown, the connecting pipe 42 of the leak detection device 4 is sealed and connected to the connecting hole 121 through the sealing connector 5; the sealing connector 5 is made of metal with a thermal expansion coefficient greater than that of the cover body 12, and is provided with a through channel 54 therein, and includes a head 51 and an inserting portion 52; the head 51 is larger than the connecting hole 121, is covered on the connecting hole 121, and is screwed to the cover body 12 through bolts 6, and the head 51 is sealed with the connecting hole 121 through a sealing gasket 53; the inserting portion 52 is connected to the head 51 and is located in the connecting hole 121, and can press against the connecting hole 121 after heating. The inner wall of the hole 121; one end of the through channel 54 is connected to the connecting pipe 42, and is sealed and fixedly connected, such as welding, and the other end is located in the connecting hole 121; based on the connecting pipe 42 and the connecting hole 121 being connected by the sealing connector 5, the connecting pipe 42 is easy to disassemble; and, when the inserting part 52 expands due to heat, it can abut against the inner wall of the connecting hole 121, then, the sealing between the sealing connector 5 and the connecting hole 121 can be improved, and the gas in the environment can be prevented from entering and affecting the accuracy of the measurement; preferably, the inserting part 52 and the connecting hole 121 have a clearance fit, such as a fit.

[0050] In some preferred embodiments, the bolt rod 61 of the bolt 6 includes a cylindrical portion 611 and a threaded portion 612; the cylindrical portion 611 is close to the nut 62 of the bolt 6 and is gap-matched with the through hole of the head 51; the sealing gasket 53 is made of a material that can deform under pressure, such as graphite or other high-temperature resistant elastic materials.

[0051] In some preferred embodiments, Figure 3 As shown, the insertion portion 52 is a truncated cone-shaped structure that gradually expands from one side of the connecting head 51 to the other side; the connecting hole 121 is a conical hole connected to the insertion portion 52, and the inner wall of the connecting hole 121 fits with the surface of the insertion portion 52; based on the insertion portion 52 and the connecting hole 121 are both set as truncated cone-shaped structures, when the sealing connector 5 is screwed on the cover body 12, the inner wall of the connecting hole 121 fits with the surface of the insertion portion 52, so that the gap between the two is smaller, and then when the insertion portion 52 is heated and expanded, it can fit more closely with the inner wall of the connecting hole 121, which can further improve the sealing performance; and based on its truncated cone-shaped structure, when it expands, it will generate a force along the extension direction of the connecting hole, thereby driving the head 51 to move toward the cover body 12, thereby improving the sealing performance between the head 51 and the cover body 12.

[0052] Preferably, the head 51 and the insertion part 52 are screwed together, and the head 51 is provided with a threaded hole 511 for screwing the end of the insertion part 52; the connecting tube 42 is sealed and connected to the outer periphery of the threaded hole 511, based on which the head 51 and the insertion part 52 are detachable, and during the process of screwing the head 51 and the insertion part 52, the sealing gasket 53 can be squeezed and the insertion part 52 can be tightly fitted to the inner wall of the connecting hole 121.

[0053] In some preferred embodiments, the double sealing ring 2 includes an inner sealing ring 21 and an outer sealing ring 22 ; there is a gap between the inner sealing ring 21 and the outer sealing ring 22 , and both are sealedly connected to the container body 11 and the cover body 12 .

[0054] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions, characterized in that: Includes test container, double seal, heating assembly and leak detection equipment; The test container comprises a container body, a cover body and a partition; The cover body is disposed on the container body and is sealed and connected via the double sealing rings to form a containing space inside; The partition is arranged in the accommodation space and divides the accommodation space into a first space and a second space which are independent of each other; The first space is close to the cover body; The heating component is disposed in the second space; The leak detection device is connected to the gap between the double sealing rings via the connecting hole of the cover body.

2. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 1, characterized in that: The heating assembly includes a heater, a first temperature measuring element, a second temperature measuring element and a heating controller; The heater is disposed in the second space; The first temperature measuring element is arranged in the first space and adjacent to the double sealing ring, and is used to measure the temperature of the double sealing ring; The second temperature measuring element is disposed in the second space and adjacent to the heater, and is used to measure the temperature of the heater; The heating controller is connected to the heater, the first temperature measuring element and the second temperature measuring element, and is used to control the heater according to the measurement values ​​of the first temperature measuring element and the second temperature measuring element.

3. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 2, characterized in that: It comprises a plurality of the first temperature measuring elements and a plurality of the second temperature measuring elements; the plurality of the first temperature measuring elements are evenly distributed along the inner circumference of the double sealing ring; and the plurality of the second temperature measuring elements are evenly distributed in the second space.

4. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 1, characterized in that: The leak detection equipment includes a helium concentration sensor, a connecting pipe, and a helium mass spectrometer; The helium concentration sensor is used to measure the helium concentration in the first space; The connecting pipe connects the connecting hole and the helium mass spectrometer.

5. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 2, characterized in that: A plurality of helium concentration sensors are included; the plurality of helium concentration sensors are used to measure the helium concentration in the middle and bottom of the first space at least.

6. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 1, characterized in that: An air filling port is provided on the wall of the test container corresponding to the first space, and is used for connecting an external helium pressure device.

7. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 1, characterized in that: The connecting pipe of the leak detection device is sealed and connected to the connecting hole through a sealing connector; The sealing connector is made of a metal material having a thermal expansion coefficient greater than that of the cover body, is provided with a through passage therein, and includes a head portion and an insertion portion; The head is larger than the communicating hole, the cover is disposed on the communicating hole and is screwed to the cover body by bolts, and the head is sealed with the communicating hole by a sealing gasket; The inserting portion is connected to the head and is located in the communicating hole, and can abut against the inner wall of the communicating hole after heating; One end of the through passage is connected to the connecting pipe, and the other end is located in the connecting hole.

8. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 7, characterized in that: The bolt shank of the bolt comprises a cylindrical portion and a threaded portion; The cylindrical portion is close to the nut of the bolt and is in clearance fit with the through hole of the head; The sealing gasket is made of a material that can be deformed under pressure.

9. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 7, characterized in that: The inserting part is a truncated cone-shaped structure that gradually expands from one side connected to the head to the other side; the communicating hole is a conical hole of the inserting part, and the inner wall of the communicating hole is in contact with the surface of the inserting part.

10. The device for measuring the performance of metal sealing rings for spent fuel storage under high temperature conditions according to claim 1, characterized in that: The double sealing ring comprises an inner sealing ring and an outer sealing ring; there is a gap between the inner sealing ring and the outer sealing ring, and both are sealedly connected to the container body and the cover body.

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