CN219657104U - Special vacuum cover device for adjustable helium inspection - Google Patents
Special vacuum cover device for adjustable helium inspection Download PDFInfo
- Publication number
- CN219657104U CN219657104U CN202321237663.6U CN202321237663U CN219657104U CN 219657104 U CN219657104 U CN 219657104U CN 202321237663 U CN202321237663 U CN 202321237663U CN 219657104 U CN219657104 U CN 219657104U
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- China
- Prior art keywords
- plate
- adjusting
- helium
- vacuum cover
- special vacuum
- Prior art date
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Links
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 28
- 239000001307 helium Substances 0.000 title claims abstract description 28
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000007689 inspection Methods 0.000 title description 2
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims description 7
- 238000011056 performance test Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 229910052664 nepheline Inorganic materials 0.000 description 1
- 239000010434 nepheline Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model belongs to the technical field of nuclear power plant performance tests, and particularly relates to an adjustable special vacuum cover device for helium detection. The top plate, the front plate, the back plate and the side plate are connected to form a semi-sealed vacuum cover, the adjusting plate is mounted on the inner side of the front plate through the adjusting bolt, and meanwhile the top of the adjusting plate is attached to the lower portion of the side plate. The sealing strip is adhered to the lower part of the side plate, the inside of the adjusting plate and the inside of the back plate, and the distance between the adjusting plate and the back plate is adjusted by screwing the adjusting bolt to form a complete sealing ring. The special vacuum cover can realize the tightness which can adapt to the change of a certain range of width under a narrower width, and the tightness can meet the requirement of helium leakage detection.
Description
Technical Field
The utility model belongs to the technical field of nuclear power plant performance tests, and particularly relates to an adjustable special vacuum cover device for helium detection.
Background
The nepheline nuclear power No. 1 unit is a four-generation reactor, the coolant in the main loop is liquid metal sodium, and in order to ensure that the loop tightness meets the requirement, a helium leak detection mode is adopted for carrying out an air tightness test.
The main equipment is provided with a fillet weld at the pressure boundary after being mounted on the pile container, the width of the position is narrow, the width change is large after being mounted and welded, and the vacuum degree required by the test is high. The conventional vacuum cover is fixed, and sealing is realized through extrusion change of the sealing strip, so that the sealing performance required by helium detection can not be realized when the width is changed. The sealing performance of such pressure boundaries cannot be verified.
Disclosure of Invention
The utility model aims to provide an adjustable special vacuum cover device for helium detection. In order to verify the tightness of the pressure boundary at the joint of the main equipment and the pile body, the device is provided with a vacuum pumping port so as to carry out helium leak detection, and a stop block with an adjustable clearance function is arranged to verify whether the tightness of the pressure boundary meets the requirement.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
an adjustable special vacuum cover device for helium detection is characterized in that a top plate, a front plate, a rear plate and a side plate are connected to form a semi-sealed vacuum cover, an adjusting plate is arranged on the inner side of the front plate through an adjusting bolt, and meanwhile the top of the adjusting plate is attached to the lower portion of the side plate.
The sealing strip is adhered to the lower part of the side plate, the inside of the adjusting plate and the inside of the back plate, and the distance between the adjusting plate and the back plate is adjusted by screwing the adjusting bolt to form a complete sealing ring.
The top plate has two openings.
The two openings are respectively connected with a helium mass spectrometer leak detector and a standard leak.
The vacuum hood arrangement is placed over the fillet weld.
The beneficial effects obtained by the utility model are as follows:
the utility model relates to an adjustable special vacuum cover for helium detection, which can realize the tightness suitable for a certain range of width change under a narrower width, and can meet the requirement of helium leakage detection.
1) One open pore of the top plate is connected with the helium leak detector, so that the helium content in the vacuum cover can be detected, and the other open pore is connected with the standard leak hole, so that the system performance of the vacuum cover can be calibrated.
2) The adjustment within 1cm can be realized through the adjusting plate, the air tightness meets the requirement, and the adjustment range can be larger according to the tensile property of the sealing strip.
3) The vacuum cover can realize vacuum degree below 1Pa, and the sensitivity of helium leak detection is better than 10 -9 Pa·m 3 /s。
Drawings
FIG. 1 is a block diagram of an adjustable dedicated vacuum enclosure apparatus for helium testing;
in the figure: 1-a top plate; 2-side plates; 3-adjusting bolts; 4-front plate; 5-an adjusting plate; 6- (2)
And a rear plate.
Detailed Description
The utility model will now be described in detail with reference to the drawings and specific examples.
The utility model is mainly used for helium leakage detection of pressure boundary fillet weld. The principle of the utility model is that a closed space is formed by the top plate, the side plates, the front plate and the rear plate and the fillet weld to be detected. The adjusting plate 5 is installed on the inner side of the front plate 4 through the adjusting bolt 3, and meanwhile the top of the adjusting plate 5 is attached to the lower portion of the side plate 2, so that the distance between the adjusting plate 5 and the rear plate 6 can be changed through the adjusting bolt 3, the angle welding seam with different widths is adapted, and the required vacuum degree is provided for helium leak detection. And two openings of the top plate are connected with the helium mass spectrometer leak detector and the standard leak hole to form a complete detection system.
And (3) assembling: the vacuum cover is formed by connecting the top plate 1, the front plate 4, the rear plate 6 and the side plate 2 to form a semi-sealed vacuum cover, sealing strips are adhered to the lower part of the side plate 2, the inside of the adjusting plate 5 and the inside of the rear plate 6, and the distance between the adjusting plate 5 and the rear plate 6 is adjusted by screwing the adjusting bolt 3 to form a complete sealing ring. And (2) mounting: the vacuum cover is placed on the fillet weld and pressed downwards, and the distance between the adjusting plate and the surface to be detected is adjusted through the adjusting bolt, so that the adjusting plate is tightly pressed with the surface to be detected. And (3) system connection: the top plate was connected to a helium mass spectrometer leak detector with the other opening connected to a standard leak. Vacuumizing: and starting the helium mass spectrometer leak detector, and pumping the vacuum degree in the special vacuum cover to a required set value. And (3) calibrating a system: and opening a standard leak hole to perform system calibration. And (3) detection: leak detection is performed on the subject. And (3) disassembly: and releasing the pressure, loosening the adjusting bolt, and disassembling the special vacuum cover.
Claims (5)
1. An adjustable special vacuum cover device for helium detection is characterized in that: the top plate, the front plate, the back plate and the side plate are connected to form a semi-sealed vacuum cover, the adjusting plate is mounted on the inner side of the front plate through the adjusting bolt, and meanwhile the top of the adjusting plate is attached to the lower portion of the side plate.
2. The adjustable special vacuum hood apparatus for helium testing according to claim 1, wherein: the sealing strip is adhered to the lower part of the side plate, the inside of the adjusting plate and the inside of the back plate, and the distance between the adjusting plate and the back plate is adjusted by screwing the adjusting bolt to form a complete sealing ring.
3. The adjustable special vacuum hood apparatus for helium testing according to claim 1, wherein: the top plate has two openings.
4. An adjustable dedicated vacuum enclosure apparatus for helium testing according to claim 3, wherein: the two openings are respectively connected with a helium mass spectrometer leak detector and a standard leak.
5. The adjustable special vacuum hood apparatus for helium testing according to claim 1, wherein: the vacuum hood arrangement is placed over the fillet weld.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321237663.6U CN219657104U (en) | 2023-05-22 | 2023-05-22 | Special vacuum cover device for adjustable helium inspection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321237663.6U CN219657104U (en) | 2023-05-22 | 2023-05-22 | Special vacuum cover device for adjustable helium inspection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219657104U true CN219657104U (en) | 2023-09-08 |
Family
ID=87879053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321237663.6U Active CN219657104U (en) | 2023-05-22 | 2023-05-22 | Special vacuum cover device for adjustable helium inspection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219657104U (en) |
-
2023
- 2023-05-22 CN CN202321237663.6U patent/CN219657104U/en active Active
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| GR01 | Patent grant |