Helium leak detection device for rupture disk device of nuclear power equipment

Abstract

The invention belongs to the technical field of detection devices, and provides a helium leak detection device for a rupture disk device of nuclear power equipment, the helium leak detection device comprises a gas inlet pipe, a gas outlet pipe, an inner cylinder, an outer cylinder and a detection assembly, the outer cylinder is sleeved in the inner cylinder, and the gas inlet pipe and the gas outlet pipe pass through the outer cylinder and are communicated with the inner cylinder; a detection pipeline is arranged on the side wall of the outer cylinder, and the detection assembly is connected with the outer cylinder through the detection pipeline. By optimizing the structural design of the air inlet pipe, the air outlet pipe, the inner cylinder body and the outer cylinder body, the inner cylinder body and the outer cylinder body are completely separated and have independent sealed spaces, meanwhile, segmented installation is not needed, the functions of rapid inflation and exhaust are achieved, the detection period is greatly shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of detection devices, and in particular relates to a helium leak detection device for a bursting disc device of a nuclear power equipment. Background Art

[0002] Nuclear power nuclear island main equipment system such as Figure 1 As shown, the steam generator set components have been operating under the harsh conditions of high temperature, high pressure, high flow rate liquid flushing and sodium environment for a long time, and there is a risk of leakage. Once the system leaks, the water, water vapor and sodium in the container will react violently with sodium water, which will release a large amount of heat and produce hydrogen, causing the temperature and pressure near the sodium water reaction zone to rise sharply; as the corrosion of the leak expands, the leakage will expand and spread, which will not only damage the steam generator, but in severe cases will threaten the normal operation of the sodium-cooled fast reactor. In order to protect the safety of the entire sodium circuit, multiple bursting disc safety devices are installed in the system. As a widely used safety relief device, the bursting disc safety device can explode at a calibrated temperature and pressure to release pressure, which can effectively prevent the equipment from being damaged by overpressure; the structure of the bursting disc device is shown in the figure. Figure 2 The figure shows a vertical cylindrical jacketed vessel, in which both the inner shell component and the outer shell component are sealed with C-type sealing rings. During use, the C-type sealing ring is in line contact with the tube sheet surface, resulting in a low sealing effect. Therefore, a helium leak test is required to verify the sealing effect of the C-type sealing ring and the sealing performance of the butt weld.

[0003] In the prior art, usually Figure 1 as well as Figure 2 Two detection devices, among which, Figure 1 In the embodiment, when each internal component is subjected to helium leak detection, the two sealed chamber components need to be welded twice to the upper and lower parts of the cylinder respectively. After the helium leak detection test is completed, they need to be removed by grinding. In addition, defects and quality problems are easily caused during the welding and grinding process. When using this solution, welding and grinding are required for each test during the helium leak detection and sealing test, which is easy to cause quality problems. At the same time, it is not possible to quickly assemble and disassemble, and the work efficiency is low. Figure 2 In the embodiment, the helium leak detection sealing test device and the components inside the bursting disc share a flange end cover, so that they form two inner and outer sealed chambers. The two sealed chambers need to be pre-tightened using two sets of fastener components, and the C-type sealing ring has clear requirements on the size of the bolt pre-tightening force. There is a factor that the pre-tightening force of fastener component 1 interferes with the pre-tightening force of fastener component 2. Therefore, the pre-tightening force of fastener component 1 is difficult to control, which adds uncontrollable factors of the non-C-type sealing ring seal itself to the helium leak detection test, greatly reducing the probability of success of the helium leak detection sealing test. For this reason, it is necessary to design a detection device that is efficient and easy to install. Summary of the invention

[0004] In order to overcome the problems existing in the prior art, an object of the present invention is to provide a helium leak detection device for a bursting disc device of a nuclear power equipment.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a helium leak detection device for a bursting disc device of a nuclear power equipment, comprising: an air inlet pipe, an air outlet pipe, an inner cylinder, an outer cylinder and a detection component, the outer cylinder is sleeved in the inner cylinder, the air inlet pipe and the air outlet pipe pass through the outer cylinder and are connected with the inner cylinder; a detection pipeline is arranged on the side wall of the outer cylinder, and the detection component is connected with the outer cylinder through the detection pipeline; the inner cylinder comprises an inner cylinder body, a pressure cover, a blind plate and an inner sealing ring; the inner sealing ring is arranged at the opening of the inner cylinder body, the blind plate is arranged on the inner side of the pressure cover, the pressure cover is fixed at the opening of the inner cylinder body and presses the inner sealing ring and the blind plate; an air inlet is arranged on the pressure cover, the air inlet is connected to the air inlet pipe, and an air outlet is arranged at the bottom of the inner cylinder body, and the air outlet is connected to the air outlet pipe.

[0006] Its main working principle is to determine the leakage of the bursting disc device of nuclear power equipment, that is, the inner cylinder, based on the tracking and detection capabilities of helium. The working process is as follows: First, the inner cylinder to be tested is placed in the outer cylinder and covered with a gland. At the same time, in order to improve its airtightness, a blind plate and an inner sealing ring are separately set between the gland and the inner cylinder. At this time, ensure that the inner cylinder itself can form a closed detection space. Then, helium is filled into the inner cylinder through the air inlet pipe. As a light gas that is not easy to react with other substances, helium can penetrate tiny leaks.

[0007] When the detection space is filled with helium, helium can enter the outer cylinder through the leakage point between the pressure cap and the inner cylinder body. Then the helium is connected to the detection component outside the detection space through the detection pipe on the side wall of the outer cylinder. The detection component starts to work and checks the helium content, thereby reflecting the leakage degree of the inner cylinder and further reflecting the sealing performance of the inner cylinder.

[0008] After the test is completed, the helium can be discharged through the outlet pipe, and the inner cylinder can be repaired or replaced as necessary according to the test results.

[0009] During the entire testing process, the design of the air inlet and outlet pipes ensures that helium can flow smoothly into and out of the testing space, while the structure of the inner cylinder and the gland ensures the sealing of the testing space, making helium leak detection both accurate and efficient.

[0010] Preferably, an inner cylinder flange is provided at the opening of the inner cylinder body, and the inner cylinder flange and the inner cylinder body are an integrally formed structure; the pressure cover is fixedly connected to the inner cylinder flange by screws and presses the inner sealing ring and the blind plate.

[0011] Preferably, a support portion is provided at the bottom of the inner cylinder body, the support portion is integrally formed with the inner cylinder body, an end of the support portion is in contact with the outer cylinder body, and the support portion separates the inner cylinder body from the outer cylinder body.

[0012] Preferably, the outer cylinder body includes an outer cylinder body and an end cover, the end cover is fixedly installed at the opening of the outer cylinder body, the end cover is provided with a first through hole, the air inlet pipe is connected to the air inlet through the first through hole, and a second through hole is provided at the bottom of the outer cylinder body, and the air outlet pipe is connected to the air outlet through the second through hole.

[0013] Preferably, the air inlet pipe is threadedly connected to the first through hole, the air inlet pipe is threadedly connected to the second through hole, gaskets are sleeved on the outside of the air inlet pipe and the air outlet pipe, and the gaskets are tightened during the connection between the air inlet pipe and the first through hole and the air inlet pipe and the second through hole.

[0014] Preferably, an outer cylinder flange and an outer sealing ring are provided at the opening of the outer cylinder body, and the outer cylinder flange and the outer cylinder body are an integrally formed structure; the pressure cover is fixedly connected to the inner cylinder flange by screws and the outer sealing ring is pressed.

[0015] Preferably, it further comprises a lifting ring, wherein the lifting ring is fixedly connected to the air intake pipe.

[0016] Preferably, the air inlet pipe is a threaded steel pipe.

[0017] Preferably, at least two groups of the detection pipes are provided, at least two groups of the detection pipes are connected to the outer cylinder, the detection assembly includes a leak detector and a pressure gauge, at least two groups of the detection pipes are connected to the leak detector and the pressure gauge respectively.

[0018] Preferably, the side wall of the outer cylinder is provided with ear seats, and the ear seats are provided in at least two groups, and at least two groups of the ear seats are respectively arranged on both sides of the outer cylinder.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] By optimizing the structural design of the air inlet pipe, air outlet pipe, inner cylinder and outer cylinder, the inner cylinder and outer cylinder are completely separated, both of which have independent sealing spaces, and do not need to be installed in sections, which realizes the functions of rapid inflation and exhaust, greatly shortens the detection cycle, and improves work efficiency. At the same time, the improvement of the internal structure of the inner cylinder, especially the use of the inner sealing ring and the blind plate, enhances the sealing performance of the detection space, helps to detect tiny leaks more accurately, and improves the accuracy of detection. And it simplifies the operation process, making it easier for staff to perform leak detection operations, reducing the complexity of operation and the possibility of human error. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the existing embodiment 1;

[0023] Figure 2 Schematic diagram of existing embodiment 2

[0024] Figure 3 This is a schematic diagram of the helium leak detection device used for the bursting disc device of nuclear power equipment.

[0025] 1. Inlet pipe; 2. Outlet pipe; 3. Inner cylinder; 30. Inner cylinder body; 31. Pressure cover; 32. Blind plate; 33. Inner sealing ring; 34. Inner cylinder flange; 35. Support part; 4. Outer cylinder; 40. Outer cylinder body; 400. Second through hole; 41. End cover; 410. First through hole; 42. Outer cylinder flange; 43. Outer sealing ring; 5. Detection component; 50. Leak detector; 51. Pressure gauge; 6. Gasket; 7. Lifting ring; 8. Ear seat. DETAILED DESCRIPTION

[0026] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0028] This embodiment provides a helium leak detection device for a bursting disc device of a nuclear power equipment, such as Figure 3 The figure shows an air inlet pipe 1, an air outlet pipe 2, an inner cylinder 3, an outer cylinder 4 and a detection assembly 5. The outer cylinder 4 is sleeved in the inner cylinder 3, so that the inner parts of the outer cylinder 4 and the inner cylinder 3 have independent cavities. The air inlet pipe 1 and the air outlet pipe 2 pass through the outer cylinder 4 and communicate with the inner cylinder 3, so that helium can be discharged into the inner cylinder 3 through the air inlet pipe 1 and discharged from the exhaust pipe. A detection pipeline is provided on the side wall of the outer cylinder 4, and the detection assembly 5 is connected to the outer cylinder 4 through the detection pipeline to detect leakage of the inner cylinder 3.

[0029] The inner cylinder 3 includes an inner cylinder body 30, a gland 31, a blind plate 32, and an inner sealing ring 33. The inner sealing ring 33 is arranged at the opening of the inner cylinder body 30, and the blind plate 32 is arranged on the inner side of the gland 31. The gland 31 is fixed at the opening of the inner cylinder body 30 and presses the inner sealing ring 33 and the blind plate 32. The gland 31 is provided with an air inlet, which is connected to the air inlet pipe 1, and the bottom of the inner cylinder body 30 is provided with an air outlet, which is connected to the air outlet pipe 2. The air tightness of the inner cylinder 3 is improved in this way.

[0030] During operation, first, the inner cylinder 3 to be tested is placed in the outer cylinder 4 and covered with a gland 31. At the same time, in order to improve its airtightness, a blind plate 32 and an inner sealing ring 33 are separately arranged between the gland 31 and the inner cylinder 30. At this time, it is ensured that the inner cylinder 3 itself can form a closed detection space. Then, helium is filled into the inner cylinder 3 through the air inlet pipe 1. Helium, as a light gas that is not easy to react with other substances, can penetrate tiny leaks.

[0031] When the detection space is filled with helium, the helium can enter the outer cylinder 4 through the leakage point between the pressure cover 31 and the inner cylinder body 30, and then the helium is connected to the detection component 5 outside the detection space through the detection pipeline on the side wall of the outer cylinder 4. The detection component 5 starts to work and checks the helium content, thereby reflecting the leakage degree of the inner cylinder 3, and then reflecting the sealing performance of the inner cylinder 3.

[0032] After the detection is completed, the helium can be discharged through the gas outlet pipe 2, and the inner cylinder 3 can be repaired or replaced as necessary according to the detection results.

[0033] During the entire detection process, the design of the air inlet pipe 1 and the air outlet pipe 2 ensures that helium can smoothly enter and exit the detection space, while the structure of the inner cylinder 3 and the pressure cover 31 ensures the sealing of the detection space, thereby making the helium leak detection accurate and efficient.

[0034] In some optional embodiments, an inner cylinder flange 34 is provided at the opening of the inner cylinder body 30, and the inner cylinder flange 34 is an integrally formed structure with the inner cylinder body 30. The gland 31 is fixedly connected to the inner cylinder flange 34 by screws and compresses the inner sealing ring 33 and the blind plate 32. By means of the inner cylinder flange 34, the compression area is increased and the compression stability is improved.

[0035] In some optional embodiments, a support portion 35 is provided at the bottom of the inner cylinder body 30 , the support portion 35 is integrally formed with the inner cylinder body 30 , an end of the support portion 35 contacts the outer cylinder body 4 , and the support portion 35 separates the inner cylinder body 30 from the outer cylinder body 4 .

[0036] In some optional embodiments, the outer cylinder 4 includes an outer cylinder body 40 and an end cover 41, and the end cover 41 is fixedly installed at the opening of the outer cylinder body 40. At the same time, in order to ensure that the air inlet pipe 1 and the air outlet pipe 2 can smoothly pass through the outer cylinder body 4, a first through hole 410 is provided on the end cover 41, and the air inlet pipe 1 is connected to the air inlet through the first through hole 410. A second through hole 400 is provided at the bottom of the outer cylinder body 40, and the air outlet pipe 2 is connected to the air outlet through the second through hole 400.

[0037] In some optional implementations, the air inlet pipe 1 is threadedly connected to the first through hole 410, and the air inlet pipe 1 is threadedly connected to the second through hole 400. A gasket 6 is sleeved on the outside of the air inlet pipe 1 and the air outlet pipe 2. The gasket 6 is tightened during the connection between the air inlet pipe 1 and the first through hole 410 and the air inlet pipe 1 and the second through hole 400. By squeezing the gasket 6, the air tightness of the connection between the air inlet pipe 1, the air outlet pipe 2 and the outer cylinder 4 is improved.

[0038] In some optional implementations, an outer cylinder flange 42 and an outer sealing ring 43 are provided at the opening of the outer cylinder body 40. The outer cylinder flange 42 and the outer cylinder body 40 are an integrally formed structure. The pressure cover 31 and the inner cylinder flange 34 are fixedly connected by screws and the outer sealing ring 43 is pressed tightly.

[0039] In some optional implementations, a lifting ring 7 is further included, and the lifting ring 7 is fixedly connected to the air intake pipe 1. By setting the lifting ring 7, the inner cylinder 3 can be hoisted. Specifically, to ensure that the air intake pipe 1 can withstand the load during the hoisting process, the air intake pipe 1 needs to be set as a threaded steel pipe.

[0040] In some optional implementations, there are no less than two groups of detection pipelines, no less than two groups of detection pipelines are connected to the outer cylinder 4, the detection assembly 5 includes a leak detector 50 and a pressure gauge 51, and no less than two groups of detection pipelines are connected to the leak detector 50 and the pressure gauge 51 respectively. Of course, there are multiple groups of detection pipelines to meet different detection requirements. Each group of detection pipelines is connected to the outer cylinder 4 to facilitate the connection between the detection assembly 5 and the outer cylinder 4. The detection assembly 5 can include various types of instruments, in addition to the leak detector 50 and the pressure gauge 51, it can also include a thermometer, a hygrometer, etc. to meet different detection requirements. Each group of detection pipelines can be connected to corresponding instruments to facilitate data collection and analysis. In addition, in order to improve the accuracy and reliability of detection, a data processing unit, such as a computer or a microprocessor, can be introduced into the detection assembly 5 for real-time processing and analysis of detection data, so as to timely discover and locate leaks.

[0041] In some optional implementation embodiments, the side wall of the outer cylinder 4 is provided with ear seats 8, and the ear seats 8 are respectively provided in at least two groups, and at least two groups of ear seats 8 are respectively provided on both sides of the outer cylinder 4. When the outer cylinder 4 is placed on the fixing frame, the ear seats 8 can be placed on the surface of the fixing frame to achieve the fixing of the outer cylinder 4.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A helium leak detection device for a bursting disc device of a nuclear power equipment, characterized in that: include: An air inlet pipe, an air outlet pipe, an inner cylinder, an outer cylinder and a detection assembly, wherein the outer cylinder is sleeved in the inner cylinder, and the air inlet pipe and the air outlet pipe pass through the outer cylinder and are connected to the inner cylinder; a detection pipeline is provided on the side wall of the outer cylinder, and the detection assembly is connected to the outer cylinder through the detection pipeline; The inner cylinder comprises an inner cylinder body, a gland, a blind plate, and an inner sealing ring; The inner sealing ring is arranged at the opening of the inner cylinder body, the blind plate is arranged on the inner side of the pressure cover, the pressure cover is fixed at the opening of the inner cylinder body and presses the inner sealing ring and the blind plate; the pressure cover is provided with an air inlet, the air inlet is connected to the air inlet pipe, and the bottom of the inner cylinder body is provided with an air outlet, the air outlet is connected to the air outlet pipe.

2. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 1, characterized in that: An inner cylinder flange is arranged at the opening of the inner cylinder body, and the inner cylinder flange and the inner cylinder body are an integrally formed structure; the gland is fixedly connected to the inner cylinder flange by screws and presses the inner sealing ring and the blind plate.

3. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 1, characterized in that: A support portion is provided at the bottom of the inner cylinder body. The support portion is integrally formed with the inner cylinder body. An end of the support portion contacts the outer cylinder body. The support portion separates the inner cylinder body from the outer cylinder body.

4. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 1, characterized in that: The outer cylinder body includes an outer cylinder body and an end cover, wherein the end cover is fixedly installed at the opening of the outer cylinder body, a first through hole is provided on the end cover, and the air inlet pipe is connected to the air inlet through the first through hole, and a second through hole is provided at the bottom of the outer cylinder body, and the air outlet pipe is connected to the air outlet through the second through hole.

5. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 4, characterized in that: The air inlet pipe is threadedly connected to the first through hole, and the air inlet pipe is threadedly connected to the second through hole. Gaskets are sleeved on the outside of the air inlet pipe and the air outlet pipe. The gaskets are tightened during the connection between the air inlet pipe and the first through hole and the air inlet pipe and the second through hole.

6. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 1, characterized in that: An outer cylinder flange and an outer sealing ring are arranged at the opening of the outer cylinder body, and the outer cylinder flange and the outer cylinder body are an integrally formed structure; the gland is fixedly connected to the inner cylinder flange by screws and the outer sealing ring is pressed tightly.

7. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 1, characterized in that: It also includes a lifting ring, which is fixedly connected to the air inlet pipe.

8. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 7, characterized in that: The air inlet pipe is a threaded steel pipe.

9. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 1, characterized in that: The detection pipes are provided with at least two groups, and at least two groups of the detection pipes are connected to the outer cylinder. The detection assembly includes a leak detector and a pressure gauge, and at least two groups of the detection pipes are connected to the leak detector and the pressure gauge respectively.

10. The helium leak detection device for a bursting disc device of a nuclear power equipment according to claim 1, characterized in that: The side wall of the outer cylinder is provided with ear seats, and the ear seats are respectively provided in at least two groups, and at least two groups of the ear seats are respectively arranged on both sides of the outer cylinder.

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