CN211317647U - Leak detection and treatment tool for water chamber copper pipe of water chilling unit - Google Patents
Leak detection and treatment tool for water chamber copper pipe of water chilling unit Download PDFInfo
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- CN211317647U CN211317647U CN201921965019.4U CN201921965019U CN211317647U CN 211317647 U CN211317647 U CN 211317647U CN 201921965019 U CN201921965019 U CN 201921965019U CN 211317647 U CN211317647 U CN 211317647U
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Abstract
The utility model belongs to the technical field of the cooling water set overhauls, concretely relates to leak hunting and processing tool of cooling water set hydroecium copper pipe. In the utility model, the leak detection device comprises a helium mass spectrometer leak detector and a helium inlet; the processing device comprises a pipe expander, glue injection and a bushing; in the positive pressure accumulation method, a film is positioned on the outer side surface of a water chamber tube plate, a helium mass spectrometer leak detector is connected with a suction gun, and the suction gun is used for detecting the accumulated concentration of helium in the film to judge whether leakage exists or not; in the positive pressure suction gun method, suction guns are arranged at different positions of a copper pipe and a pipe plate, and the change of the instantaneous concentration of helium is detected to confirm the leakage position; helium is charged from a helium inlet. The reinforcing bushing is added on the basis of the traditional tube expansion process, the strength of the copper tube interface is enhanced after leak points are treated, and the heat exchange efficiency is not influenced.
Description
Technical Field
The utility model belongs to the technical field of the cooling water set overhauls, concretely relates to leak hunting and processing tool of cooling water set hydroecium copper pipe.
Background
At present, the traditional leakage detection means of the water chilling unit is foam leakage detection, only the leakage point defect on the surface can be detected, and finally the water chilling unit is judged to be qualified in tightness through pressure leakage detection and vacuum leakage detection, so that the refrigerant is allowed to have small amount of micro leakage. And the water system of the nuclear power plant has strict requirements on water quality, abnormal ions exist, the corrosion probability of materials is increased, and even the risk of radioactive outflow exists. Micro-leakage of the copper pipe of the water chilling unit can also cause leakage of the refrigerant to an adjacent water system, so that the ion level of the water system is increased, and the consequences are serious. The micro-leakage defect of the copper tube of the water chamber needs to be found and thoroughly treated, so that a new detection means and an acceptance standard need to be found. The risk point of the copper pipe leakage point of the water chilling unit mainly exists between the copper pipe of the water chamber and the pipe plate, and the leakage defect existing between the copper pipe joint of the water chamber and the pipe plate of the water chilling unit is treated.
Disclosure of Invention
1. The purpose is as follows:
this novel detection means and processing frock, the leak source that seeks hydroecium and copper pipe that can be accurate carries out effective reliable processing to the leak source.
2. The technical scheme is as follows:
the utility model discloses use in leak source inspection, processing, verification.
A leak detection and treatment tool for a water chamber copper pipe of a water chilling unit comprises a leak detection device and a treatment device; the leakage detection device comprises a helium mass spectrometer leakage detector and a helium inlet; the processing device comprises a pipe expander, glue injection and a bushing; in the positive pressure accumulation method, a film is positioned on the outer side surface of a water chamber tube plate, a helium mass spectrometer leak detector is connected with a suction gun, and the accumulated concentration of helium in the film is detected by the suction gun to judge that leakage exists; in the positive pressure suction gun method, a helium mass spectrometer leak detector is connected with a suction gun, the suction gun is arranged at different positions of a copper pipe and a pipe plate on the water side, and the change of the instantaneous concentration of helium is detected to confirm the leakage position; helium is charged from a helium inlet.
The bushing is tightly attached to the inner wall of the copper pipe.
The bushing is of a conical structure and is inserted into the copper pipe.
The tube plate is clamped outside the copper tube, and glue is filled between the tube plate and the copper tube.
3. The effect is as follows:
this novel detection means and processing frock, the leak source of looking into hydroecium and copper pipe that can be accurate carries out effective reliable processing to the leak source. And finally, the tightness of the water chamber can be effectively verified. Effectively control the abnormal ion level of the related water system.
And a helium mass spectrum leak detection method is introduced to obtain higher detection sensitivity and accurately find the position of a specific leak point. And the defect that only surface defects can be detected by a foaming method can be made up, and the defects of the inner wall of the copper pipe can be detected.
The reinforcing bushing is added on the basis of the traditional tube expansion process, the strength of the copper tube interface is enhanced after leak points are treated, and the heat exchange efficiency is not influenced.
And finally, verifying the processing condition by using a helium mass spectrum leak detection method.
Drawings
FIG. 1 is a schematic diagram of helium mass spectrometer leak detection by positive pressure accumulation
FIG. 2 is a schematic view of helium mass spectrometer leak detection by positive pressure pipette method
FIG. 3 is a schematic view of a pipe expander with a reinforcing liner
In the figure: 1. a shell side; 2. water side; 3. a film; 4. a helium mass spectrometer leak detector; 5. a helium gas inlet; 6. a copper pipe; 7. a tube sheet; 8. a pipe expander; 9. injecting glue; 10. a bushing.
Detailed Description
The utility model discloses use in leak source inspection, processing, verification.
During leakage detection, firstly, a nitrogen positive pressure foam leakage detection method is adopted to treat leakage points outside the water chilling unit so as to eliminate the influence of the leakage points of the unit on the environment background. And removing part of nitrogen in a proper amount, filling a certain amount of helium, and performing leak detection on the water chamber by a helium mass spectrometry leak detection method, so that the position of a leak point can be accurately searched. The shell side of the water chamber of the water chilling unit is provided with a refrigerant medium, and the tube side is provided with a water medium. The specific operation method comprises the following steps:
1) helium mass spectrum positive pressure accumulation method
Firstly, measuring a background helium concentration value in the current environment, firstly, filling a certain concentration of helium and nitrogen mixed gas into a refrigerant side (namely a shell side 1) of a condenser, sealing two sides of a water chamber of the condenser by using a sealed film 3 to form a sealed space, detecting the concentration of helium in a cavity sealed by using a film after sealing for 2 hours, and comparing the concentration with the background concentration to judge whether a copper pipe of the water chamber leaks or not, or judging whether the leakage exists or not by monitoring the change of the helium concentration in the cavity. The method is greatly influenced by environmental data, so the positive pressure accumulation method is mainly used for judging whether leakage exists or not and verifying after leakage treatment; and the leakage point of the external joint of the water chilling unit is required to be eliminated before leakage detection, so that the leakage of the refrigerant to the environment caused by the leakage point of the external joint is avoided, and the helium mass spectrum test data is influenced.
2) Helium mass spectrum positive pressure suction gun method
The refrigerant side (namely the shell side 1) of the condenser is filled with mixed gas of helium and nitrogen with certain concentration (8 kilograms of nitrogen is filled firstly, and then a small amount of helium is filled until the pressure detection pressure value is about 11.5 kilograms), if leakage points exist on the joint of a copper pipe and a pipe plate or the inner wall of the copper pipe, tracer gases of helium and nitrogen can enter the outer side and the surrounding atmospheric environment from a leakage hole, the change of the helium concentration rise in the surrounding atmospheric environment is detected by adopting a suction gun mode, and the position with the leakage defect and the unit leakage quantity can be specifically judged.
Aiming at the leak source treatment of the joint of the copper pipe and the pipe plate 7, a reinforcing lining is added on the basis of the traditional pipe expanding process, namely the strength of the pipe head is enhanced, and the lining 10 does not rebound or fall off. The lining 10 is arranged in a defective copper pipe, the expansion and propulsion of the pipe expander 8 are utilized, when a metal plastic material is extruded by a large force, the metal slides inwards, the lining 10 is wedged into the surface layer of the heat transfer pipe after being expanded, and the tight combination is realized, so that the compensation sealing effect is achieved; meanwhile, the adhesive is added between the copper tube and the tube plate to compensate the respective standard exceeding defects after the conventional mechanical processing, and the double insurance is used.
And finally verifying the processing condition by adopting a helium mass spectrum leak detection positive pressure accumulation method. The tightness of the water chamber can be effectively verified. Thereby controlling the abnormal ion level of the water system concerned.
Claims (4)
1. The utility model provides a leak hunting and processing tool of cooling water set hydroecium copper pipe which characterized in that: comprises a leak detection device and a processing device; the leak detection device comprises a film (3), a helium mass spectrometer leak detector (4) and a helium inlet (5); the processing device comprises a pipe expander (8), a glue injection (9) and a lining (10); in the positive pressure accumulation method, a film (3) is positioned on the outer side surface of a water chamber tube plate, a helium mass spectrometer leak detector (4) is connected with a suction gun, and the suction gun is arranged in the film (3); in the positive pressure suction gun method, a helium mass spectrometer leak detector (4) is connected with a suction gun, and the suction gun is arranged at different positions of a copper pipe and a pipe plate on a water side (2); helium is filled from a helium inlet (5).
2. The leak detection and treatment tool for the copper pipe of the water chamber of the water chilling unit according to claim 1, characterized in that: the bushing (10) is tightly attached to the inner wall of the copper pipe (6).
3. The leak detection and treatment tool for the copper pipe of the water chamber of the water chilling unit according to claim 1, characterized in that: the bushing (10) is of a conical structure and is inserted into the copper pipe (6).
4. The leak detection and treatment tool for the copper pipe of the water chamber of the water chilling unit according to claim 1, characterized in that: the tube plate (7) is clamped at the outer side of the copper tube (6), and glue injection (9) is filled between the tube plate and the copper tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921965019.4U CN211317647U (en) | 2019-11-14 | 2019-11-14 | Leak detection and treatment tool for water chamber copper pipe of water chilling unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921965019.4U CN211317647U (en) | 2019-11-14 | 2019-11-14 | Leak detection and treatment tool for water chamber copper pipe of water chilling unit |
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| Publication Number | Publication Date |
|---|---|
| CN211317647U true CN211317647U (en) | 2020-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921965019.4U Active CN211317647U (en) | 2019-11-14 | 2019-11-14 | Leak detection and treatment tool for water chamber copper pipe of water chilling unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526876A (en) * | 2022-01-27 | 2022-05-24 | 核电运行研究(上海)有限公司 | Differential pressure induction type conical pipe plug, negative pressure leakage detection device and leakage detection method thereof |
-
2019
- 2019-11-14 CN CN201921965019.4U patent/CN211317647U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526876A (en) * | 2022-01-27 | 2022-05-24 | 核电运行研究(上海)有限公司 | Differential pressure induction type conical pipe plug, negative pressure leakage detection device and leakage detection method thereof |
| CN114526876B (en) * | 2022-01-27 | 2024-06-11 | 核电运行研究(上海)有限公司 | Differential pressure induction type conical pipe plug, negative pressure leakage detection device and leakage detection method thereof |
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