CN219511768U - Test device for measuring tightness of seal box by oxygen-containing method - Google Patents
Test device for measuring tightness of seal box by oxygen-containing method Download PDFInfo
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- CN219511768U CN219511768U CN202320480610.0U CN202320480610U CN219511768U CN 219511768 U CN219511768 U CN 219511768U CN 202320480610 U CN202320480610 U CN 202320480610U CN 219511768 U CN219511768 U CN 219511768U
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Abstract
The utility model discloses a test device for measuring tightness of a seal box by an oxygen-containing method, which comprises a seal box to be tested, wherein one side of the seal box to be tested is connected with an air source through an air inlet pipe, the other side of the seal box to be tested is connected with a plurality of exhaust pipes, the seal box is respectively connected with an air pump and an oxygen analyzer through the exhaust pipes, and the air inlet pipe and the exhaust pipes are respectively provided with a control valve and a check valve. According to the utility model, the inert gas (high-purity nitrogen) is conveyed into the sealed box to be detected to purify the box chamber, and then whether the oxygen and the pressure in the box are changed or not is detected, so that the sealing effect of the sealed box to be detected is judged. The utility model has good tightness, short detection process time and more accurate detection.
Description
Technical Field
The utility model relates to the technical field of detection equipment, in particular to a test device for measuring tightness of a sealing box by an oxygen-containing method.
Background
The circulating fan unit and the cooling heat exchanger which are applied to the inert gas safety protection system of the nuclear power plant are integrally arranged in a process box to form a sealed box, and the sealed box is integrally welded. In order to prevent leakage of harmful gases in the system, which is harmful to human health, the sealing performance of this seal box is extremely high. In the prior art, there are various ways to detect the sealing performance of a container manufactured by welding, but the conventional and economical ways are to detect by adopting a water measurement method, namely, observing whether bubbles escape from water by a bubble coating method and a manual soaking method in water, so as to judge the sealing performance of the container. The method is simple, convenient and more visual, but the method is inaccurate in detecting tiny leakage points of the container, has a certain subjective factor in judgment, is easy to misjudge, cannot quantify detection data, cannot accurately measure the sealing performance of the product, and is low in detection efficiency but extremely high in labor cost.
Disclosure of Invention
The utility model aims to solve the technical problems in the prior art, and provides a test device for measuring the tightness of a seal box by an oxygen-containing method, which has the advantages of good tightness, short detection process time and high detection precision.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides a test device of sealing box leakproofness is surveyed to oxygen-containing method, includes the sealed box that is surveyed, one side of the sealed box that is surveyed is connected with the air supply through the intake pipe, and the opposite side is connected with a plurality of blast pipes to be connected with air pump and oxygen analyzer respectively through the blast pipe, all be provided with control valve and check valve on intake pipe and the blast pipe.
The exhaust pipeline adopts a metal pipe, the pipeline joints are all connected in a welding mode, and the welding quality of the welding line is checked in a penetration test mode through nondestructive testing, so that leakage generated at the transitional joint is avoided. The check valve is arranged on the pipeline of the air inlet pipe and the exhaust pipe, and the test medium can only flow along the air flow direction, so that the backflow of the mixed gas is prevented, and the purity of the test gas is influenced. The exhaust pipe is provided with an independent large-caliber pipeline which is specially used for rapidly exhausting the air in the laboratory, so that the experimental time is greatly shortened. During experiments, firstly, an air source is opened to convey inert gas (the air source adopts inert gas with high purity) into the box body to flow through the box chamber so as to purify the box chamber, the concentration of oxygen is continuously monitored, and when the concentration of oxygen is reduced to be low enough, the purification process is stopped. And starting the air pump to adjust the pressure in the box body to the experimental pressure, and closing the box body, and detecting whether the oxygen and the pressure in the box body change or not through the oxygen analyzer, so as to judge the tightness of the box body to be detected.
Further, a pressure reducing valve is arranged at the air outlet end of the air source and used for reducing and stabilizing the pressure of air delivery, so that the pressure meets the test requirement.
Further, the control valve and the check valve are in threaded connection with the air inlet pipe/the air outlet pipe, sealing tapes are wound at the threaded positions, and meanwhile, water seals are adopted at all threaded connection positions, so that the tightness of a test pipeline and the purity of a test medium are ensured.
Further, the air inlet end of the air inlet pipe adopts a nine-way assembly, the air inlet pipe adopts the nine-way assembly, the air in the box body is ensured to be discharged rapidly, and the air is ensured to be conveyed to all corners in the box body.
Further, a vacuum gauge is arranged on the exhaust pipe, and the pressure in the box body is measured.
Further, a dryer is arranged on the exhaust pipe connected with the oxygen analyzer, and an air inlet pipeline of the oxygen analyzer is provided with the dryer, so that impurities and moisture in a test medium can be filtered, and the measurement accuracy and the service life of the oxygen analyzer are ensured.
Further, a fan is arranged in the tested sealing box, so that the air entering the box is quickly mixed with the air in the original box, and the air discharging speed in the box is increased.
Further, the observation window is opened to the sealed box that is surveyed, be provided with the thermometer in the sealed box that is surveyed, the condition such as temperature in the convenient observation box through the observation window.
According to the utility model, the inert gas (high-purity nitrogen) is conveyed into the sealed box to be detected to purify the box chamber, and then whether the oxygen and the pressure in the box are changed or not is detected, so that the sealing effect of the sealed box to be detected is judged. The utility model has good tightness, short detection process time and more accurate detection.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
fig. 2 is a schematic diagram of the working principle of the present utility model.
Labeling and describing: 1. a fan; 2. a pressure reducing valve; 3. an air inlet pipe; 4. a sealed box to be tested; 5. a thermometer; 6. a vacuum gauge; 7. a check valve; 8. a control valve; 9. a tee joint; 10. a nine-way assembly; 11. a gas source; 12. an observation window; 13. an exhaust pipe; 14. an air pump; 15. an oxygen analyzer; 16. a dryer; 17. a first water tank; 18. and a second water tank.
Detailed Description
An embodiment of a test apparatus for measuring the sealability of a seal box by an oxygen-containing method according to the present utility model will be further described with reference to fig. 1 to 2.
The utility model provides a test device of sealing box leakproofness is surveyed to oxygen-containing method, includes the sealed box 4 that is surveyed, one side of sealed box 4 is connected with air supply 11 through intake pipe 3, and the opposite side is connected with a plurality of blast pipes 13 to be connected with air pump 14 and oxygen analyzer 15 respectively through blast pipe 13, all be provided with control valve 8 and check valve 7 on intake pipe 3 and the blast pipe 13.
The exhaust pipe 13 is a metal pipe, the pipeline joints are all connected in a welding mode, and the welding quality of the welding line is checked in a nondestructive testing and penetration test mode, so that leakage generated at the transitional joint is avoided. The check valve 7 is arranged on the pipelines of the air inlet pipe 3 and the air outlet pipe 13, and the test medium can only flow along the air flow direction, so that the backflow of the mixed gas is prevented, and the purity of the test gas is influenced. The exhaust pipe 13 is provided with an independent large-caliber pipeline which is specially used for rapidly exhausting the air in the laboratory, so that the experiment time is greatly shortened. The air inlet pipe 3 adopts a high-pressure hose, and a tee joint 9 is arranged on the pipeline and communicated with an air source 11, the tested sealing box 4 and an oxygen analyzer 15 respectively. During experiments, firstly, the air source 11 is opened to convey inert gas (the air source 11 adopts inert gas with high purity) into the box body to flow through the box chamber so as to purify the box chamber, the concentration of oxygen is continuously monitored, and when the oxygen concentration is reduced to be low enough, the purification process is stopped. The air pump 14 is started to adjust the pressure in the box body to the experimental pressure, and then the air pump is closed, and whether the oxygen and the pressure in the box body change or not is detected by the oxygen analyzer 15, so that the tightness of the box body to be detected is judged.
In this embodiment, preferably, the air outlet end of the air source 11 is provided with a pressure reducing valve 2, so as to reduce and stabilize the pressure of the air delivery, so that the pressure meets the test requirement.
In this embodiment, preferably, the control valve 8 and the check valve 7 are in threaded connection with the air inlet pipe 3/the air outlet pipe 13, a sealing tape is wound at the thread, and meanwhile, water seals are adopted at all the threaded connection parts, and the first water tank 17 and the second water tank 18 are respectively arranged at the control valve 8 and the check valve 7 of the air inlet pipe 3 and the air outlet pipe 13, so that the tightness of the test pipeline and the purity of the test medium are ensured.
In this embodiment, preferably, the air inlet end of the air inlet pipe 3 adopts a nine-way assembly 10, and the air inlet pipe 3 adopts the nine-way assembly 10, so that air in the box body is ensured to be rapidly discharged, and air can be ensured to be conveyed to all corners in the box body.
In this embodiment, preferably, the exhaust pipe 13 is provided with a vacuum gauge 6 to measure the pressure in the tank.
In this embodiment, preferably, the exhaust pipe 13 connected to the oxygen analyzer 15 is provided with a dryer 16, and the air inlet pipe 3 of the oxygen analyzer 15 is provided with the dryer 16, so that impurities and moisture in the test medium can be filtered, and the measurement accuracy and the service life of the oxygen analyzer 15 are ensured.
In this embodiment, preferably, the fan 1 is disposed in the sealed box 4 to be tested, so that the air entering the sealed box is quickly mixed with the air in the original box, and the air discharging speed in the box is increased.
In this embodiment, preferably, the sealed box 4 to be tested is provided with an observation window 12, and the sealed box 4 to be tested is provided with a thermometer 5 therein, so that the temperature inside the box body can be conveniently observed through the observation window 12.
The specific experimental procedure is shown with reference to fig. 2:
1) Connecting test pipelines and instruments among the devices according to the graph, and sealing the inlet and the outlet of the box chamber by using a blind plate;
2) Opening the control valves V3 and V4 of the air outlet and outlet pipe 13 (opening the oxygen analyzer 15 and the outer exhaust channel), and closing the control valve V2 (closing the air pump 14 channel);
3) Opening the fan 1 in the sealed box 4 to be tested;
4) Sequentially opening a pressure reducing valve V1 and a bottle head valve of a gas source 11, and allowing an inert gas (high-purity nitrogen) to flow through the box chamber to purify the box chamber, so as to continuously monitor the concentration of oxygen;
5) Observing the oxygen concentration, stopping the purification process when the oxygen concentration is low enough (about 100 ppm), and closing the fan 1, the bottle valve, the valve V4 and the valves V1 and V3 in sequence;
5) Opening a control valve V2, starting a micro air pump C (for vacuumizing), and adjusting the pressure to the test pressure (the test pressure of the project-2000 Pa);
6) Closing the valve V2 and the micro air pump C;
7) If the oxygen concentration exceeds 100ppm, repeating the steps 3) and 4) until the requirement is met;
8) In oxygen analyzer O 2 After the reading is stable, the initial oxygen concentration O in the sealed box chamber is recorded 2i Temperature and relative pressure;
9) The length of the time t is corresponding to the leakage rate of the hour to be measured (30 min in the project), and the final oxygen concentration O in the sealed box chamber is recorded 2f Air pressure, temperature and relative pressure;
10 Sealing test meets EJ/T1096-1999 standard, and the sealing grade reaches grade 1 (less than or equal to 5 multiplied by 10-4/h).
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (8)
1. A test device for measuring tightness of a sealing box by an oxygen-containing method is characterized in that: the device comprises a tested sealing box, wherein one side of the tested sealing box is connected with an air source through an air inlet pipe, the other side of the tested sealing box is connected with a plurality of exhaust pipes, the tested sealing box is respectively connected with an air pump and an oxygen analyzer through the exhaust pipes, and the air inlet pipe and the exhaust pipes are respectively provided with a control valve and a check valve.
2. The test device for measuring tightness of a seal box by an oxygen-containing method according to claim 1, wherein: the air outlet end of the air source is provided with a pressure reducing valve.
3. The test device for measuring tightness of a seal box by an oxygen-containing method according to claim 1, wherein: and a vacuum gauge is arranged on the exhaust pipe.
4. The test device for measuring tightness of a seal box by an oxygen-containing method according to claim 1, wherein: the control valve and the check valve are in threaded connection with the air inlet pipe/the air outlet pipe, sealing adhesive tapes are wound on the threaded positions, and meanwhile, water seals are adopted at all the threaded connection positions.
5. The test device for measuring tightness of a seal box by an oxygen-containing method according to claim 1, wherein: and the air inlet end of the air inlet pipe adopts a nine-way assembly.
6. The test device for measuring tightness of a seal box by an oxygen-containing method according to claim 1, wherein: and a dryer is arranged on the exhaust pipe connected with the oxygen analyzer.
7. The test device for measuring tightness of a seal box by an oxygen-containing method according to claim 2, wherein: and a fan is arranged in the tested sealing box.
8. The test device for measuring tightness of a seal box by an oxygen-containing method according to claim 7, wherein: the sealed box to be tested is provided with an observation window, and a thermometer is arranged in the sealed box to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320480610.0U CN219511768U (en) | 2023-03-14 | 2023-03-14 | Test device for measuring tightness of seal box by oxygen-containing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320480610.0U CN219511768U (en) | 2023-03-14 | 2023-03-14 | Test device for measuring tightness of seal box by oxygen-containing method |
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| Publication Number | Publication Date |
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| CN219511768U true CN219511768U (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320480610.0U Active CN219511768U (en) | 2023-03-14 | 2023-03-14 | Test device for measuring tightness of seal box by oxygen-containing method |
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| CN (1) | CN219511768U (en) |
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2023
- 2023-03-14 CN CN202320480610.0U patent/CN219511768U/en active Active
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