CN219657103U - Low-temperature cold leakage detection device - Google Patents
Low-temperature cold leakage detection device Download PDFInfo
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- CN219657103U CN219657103U CN202320063876.5U CN202320063876U CN219657103U CN 219657103 U CN219657103 U CN 219657103U CN 202320063876 U CN202320063876 U CN 202320063876U CN 219657103 U CN219657103 U CN 219657103U
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- cold
- pipe
- cold box
- liquid nitrogen
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- 238000001514 detection method Methods 0.000 title claims abstract description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 28
- 238000011084 recovery Methods 0.000 claims abstract description 21
- 239000001307 helium Substances 0.000 claims abstract description 16
- 229910052734 helium Inorganic materials 0.000 claims abstract description 16
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003860 storage Methods 0.000 claims abstract description 9
- 238000001819 mass spectrum Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Abstract
The utility model discloses a low-temperature cold leakage detection device which comprises a cold box, a liquid nitrogen storage tank, a helium bottle, a liquid nitrogen recovery tank and a vacuum unit, wherein a to-be-detected body is arranged in the cold box, the top of the to-be-detected body is connected with the vacuum unit through a leakage detection pipeline and forms a vacuumizing passage, and the leakage detection pipeline is connected with a helium mass spectrum leakage detector and a vacuum gauge; the cold box is connected with a filling pipe, a recovery pipe and an air inlet pipe, one end of the filling pipe is fixedly connected with the liquid nitrogen storage tank, and the filling pipe is fixedly connected with a top liquid inlet pipe of the cold box; the helium bottle is fixedly connected with a top air inlet hole of the cold box through an air inlet pipe; one end of the recovery pipe is fixedly connected with the liquid nitrogen recovery tank, and the other end of the recovery pipe stretches into the cold box. The utility model can detect the cold leakage condition of the to-be-detected piece in liquid nitrogen, and accurately find the position of the leakage hole and measure the size of the leakage rate, thereby ensuring the reliability of the cold leakage detection of the to-be-detected piece.
Description
Technical Field
The utility model relates to the technical field of cold leakage detection, in particular to a low-temperature cold leakage detection device.
Background
Cold leakage at low temperature refers to the phenomenon that the leakage rate index of weld defects detected at room temperature is high, and the leakage rate increases sharply at low temperature such as liquid nitrogen. In the process of manufacturing low-temperature equipment such as a low-temperature heat exchanger, a purifier, a low-temperature Dewar and the like, the phenomenon of low-temperature cold leakage caused by materials, welding flux, welding lines, structural stress and the like is a troublesome problem frequently encountered in low-temperature engineering. The existing low-temperature equipment generally adopts a gas diaphragm compressor to boost high-purity nitrogen to airtight test pressure, and then the high-purity nitrogen is filled into a test pressure container to carry out airtight test; however, some low-temperature equipment has small leakage holes with small leakage rate of 1 multiplied by 10 < -9 > Pa.m at normal temperature 3 Small leak holes below/s are difficult to inspect at normal temperature even with high sensitivity leak detectors.
Based on the above situation, the utility model provides a low-temperature cold leakage detection device which can effectively solve the above problems.
Disclosure of Invention
The utility model aims to provide a low-temperature cold leakage detection device. The low-temperature cold leakage detection device provided by the utility model can detect the cold leakage condition of the to-be-detected piece in liquid nitrogen, and accurately find the position of the leakage hole and measure the size of the leakage rate, thereby ensuring the reliability of cold leakage detection of the to-be-detected piece.
The utility model is realized by the following technical scheme:
the low-temperature cold leakage detection device comprises a cold box, a liquid nitrogen storage tank, a helium bottle, a liquid nitrogen recovery tank and a vacuum unit, wherein a body to be detected is arranged in the cold box, the top of the body to be detected is connected with the vacuum unit through a leak detection pipeline and forms a vacuumizing passage, and the leak detection pipeline is connected with a helium mass spectrometer leak detector and a vacuum gauge; the cold box is connected with a filling pipe, a recovery pipe and an air inlet pipe, one end of the filling pipe is fixedly connected with the liquid nitrogen storage tank, and the filling pipe is fixedly connected with a top liquid inlet pipe of the cold box; the helium bottle is fixedly connected with a top air inlet hole of the cold box through an air inlet pipe; one end of the recovery pipe is fixedly connected with the liquid nitrogen recovery tank, and the other end of the recovery pipe stretches into the cold box.
According to the above technical scheme, as a further preferable technical scheme of the above technical scheme, a liquid level meter is arranged on one side of the cold box.
According to the above technical scheme, as a further preferable technical scheme of the above technical scheme, the leak detection pipeline is connected with a vacuum valve.
According to the above technical scheme, as a further preferable technical scheme of the above technical scheme, the filling pipe is connected with a filling valve.
According to the above technical scheme, as a further preferable technical scheme of the above technical scheme, the air inlet pipe is connected with a one-way valve.
Compared with the prior art, the utility model has the following advantages:
the low-temperature cold leakage detection device provided by the utility model can detect the cold leakage condition of the to-be-detected piece in liquid nitrogen, and accurately find the position of the leakage hole and measure the size of the leakage rate, thereby ensuring the reliability of cold leakage detection of the to-be-detected piece.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present utility model, preferred embodiments of the present utility model will be described below with reference to specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present patent; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.
Example 1:
the low-temperature cold leakage detection device comprises a cold box 1, a liquid nitrogen storage tank 2, a helium bottle 3, a liquid nitrogen recovery tank 4 and a vacuum unit 5, wherein a body 6 to be detected is arranged in the cold box 1, the top of the body 6 to be detected is connected with the vacuum unit 5 through a leak detection pipeline 7 and forms a vacuumizing passage, and the leak detection pipeline 7 is connected with a helium mass spectrometer leak detector 8 and a vacuum gauge 9; the cold box 1 is connected with a filling pipe 10, a recovery pipe 11 and an air inlet pipe 12, one end of the filling pipe 10 is fixedly connected with the liquid nitrogen storage tank 2, and the filling pipe 10 is fixedly connected with a top liquid inlet pipe 13 of the cold box 1; the helium bottle 3 is fixedly connected with a top air inlet hole 14 of the cold box 1 through an air inlet pipe 12; one end of the recovery pipe 11 is fixedly connected with the liquid nitrogen recovery tank 4, and the other end of the recovery pipe 11 stretches into the cold box 1.
The utility model can detect the cold leakage condition of the to-be-detected piece in liquid nitrogen, and accurately find the position of the leakage hole and measure the size of the leakage rate, thereby ensuring the reliability of the cold leakage detection of the to-be-detected piece.
Further, in another embodiment, a level gauge 15 is provided on one side of the cold box 1. The level gauge 15 is arranged to detect whether the liquid nitrogen in the cold box 1 reaches an upper limit during filling.
Further, in another embodiment, a vacuum valve 16 is connected to the leak detection pipe 7.
Further, in another embodiment, a filling valve 17 is connected to the filling pipe 10.
Further, in another embodiment, the air inlet pipe 12 is connected with a check valve 18.
The working principle of one of the embodiments of the present utility model is as follows:
firstly, a filling valve 18 is opened, liquid nitrogen in a liquid nitrogen storage tank 2 is filled into a cold box 3 through an infusion pump 13 until a liquid level meter 16 reaches the upper limit, then the filling valve 18 is closed, a vacuum valve 17 is opened, the interior of a piece 6 to be detected is vacuumized until the vacuum degree displayed by the vacuum meter 9 is below 5Pa, then a one-way valve 19 is opened, high-pressure helium in a helium bottle 3 is injected into the cold box 3, liquid nitrogen is discharged through a recovery pipe 11 under the action of the helium, the liquid nitrogen level in the cold box 1 is reduced, the vertical side face of the piece 6 to be detected is detected from top to bottom, once cold leakage occurs, a helium mass spectrometer leak detector displays the leak rate, and the position of the cold leakage hole is determined.
Based on the description of the utility model and the drawings, a person skilled in the art can easily make or use a low-temperature cold leakage detecting device according to the present utility model, and can produce the positive effects described in the present utility model.
Unless specifically stated otherwise, in the present utility model, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the positional relationship indicated is based on the positional relationship indicated in the drawings, and is merely for convenience of describing the present utility model and simplifying the description, and it is not necessary to indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationship in the present utility model are merely for exemplary illustration and should not be construed as limitations of the present patent, and it is possible for those skilled in the art to understand the specific meaning of the above terms in conjunction with the drawings and according to the specific circumstances.
Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" herein are to be construed broadly, e.g., they may be fixed, removable, or integral; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present utility model fall within the scope of the present utility model.
Claims (5)
1. The utility model provides a cold detection device that leaks of low temperature which characterized in that: the device comprises a cold box (1), a liquid nitrogen storage tank (2), a helium bottle (3), a liquid nitrogen recovery tank (4) and a vacuum unit (5), wherein a body to be detected (6) is arranged in the cold box (1), the top of the body to be detected (6) is connected with the vacuum unit (5) through a leak detection pipeline (7) and forms a vacuumizing passage, and the leak detection pipeline (7) is connected with a helium mass spectrometer leak detector (8) and a vacuum gauge (9); the cold box (1) is connected with a pouring pipe (10), a recovery pipe (11) and an air inlet pipe (12), one end of the pouring pipe (10) is fixedly connected with the liquid nitrogen storage tank (2), and the pouring pipe (10) is fixedly connected with a top liquid inlet pipe (13) of the cold box (1); the helium bottle (3) is fixedly connected with a top air inlet hole (14) of the cold box (1) through an air inlet pipe (12); one end of the recovery pipe (11) is fixedly connected with the liquid nitrogen recovery tank (4), and the other end of the recovery pipe (11) stretches into the cold box (1).
2. The low-temperature cold leakage detection device according to claim 1, wherein: one side of the cold box (1) is provided with a liquid level meter (15).
3. The low-temperature cold leakage detection device according to claim 1, wherein: the leak detection pipeline (7) is connected with a vacuum valve (16).
4. The low-temperature cold leakage detection device according to claim 1, wherein: and the filling pipe (10) is connected with a filling valve (17).
5. The low-temperature cold leakage detection device according to claim 1, wherein: the air inlet pipe (12) is connected with a one-way valve (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320063876.5U CN219657103U (en) | 2023-01-10 | 2023-01-10 | Low-temperature cold leakage detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320063876.5U CN219657103U (en) | 2023-01-10 | 2023-01-10 | Low-temperature cold leakage detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219657103U true CN219657103U (en) | 2023-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320063876.5U Active CN219657103U (en) | 2023-01-10 | 2023-01-10 | Low-temperature cold leakage detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219657103U (en) |
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2023
- 2023-01-10 CN CN202320063876.5U patent/CN219657103U/en active Active
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