CN217738577U - Device for detecting leakage of single-opening container by using hydrogen-nitrogen mixed gas - Google Patents

Abstract

The utility model relates to the technical field of leak detection, and specifically discloses a device for leak detection of a single-mouth container by using a hydrogen-nitrogen mixed gas. It includes a hydrogen-nitrogen inflatable component for filling the hydrogen-nitrogen mixed gas into the single-port container to be inspected; the single-port container to be inspected is placed in the working cavity of the leak detection box; the working cavity of the leak detection box and the single-port container to be inspected are inspected. The leak detection component is connected; it also includes a replacement component; the replacement component is in communication with the working chambers of the single-port container to be tested and the leak detection box, respectively, and is filled with inert gas into the working chambers of the single-port container to be tested and the leak detection box, respectively, Thereby, the air in the working chamber of the single-mouth container to be tested and the leak detection box is replaced. The device not only reduces the cost of leak detection of the single-mouth container, but also has high detection accuracy.

Description

A device for leak detection of single-port containers using hydrogen-nitrogen mixed gas

technical field

The utility model relates to the technical field of leak detection, in particular to a device for leak detection of single-port containers using hydrogen-nitrogen mixed gas.

Background technique

At present, the airtightness of various containers is very important to production safety, life safety and economic value, and helium inspection is generally used for single-port containers with higher airtightness requirements. Due to the high price of helium, the cost of helium inspection is high. No more.

The mixed gas of 5% hydrogen + 95% nitrogen is a safe non-flammable gas, easy to buy, and the price is only about 1/10-1/20 of helium, and can be quickly detected as low as 5*10-7mbarl /s leak rate, the qualified leak rate of the single-mouth container is ≤1*10-6mbarl/s, so the hydrogen-nitrogen mixture can be used as the test gas for whether the air-tightness of the single-mouth container is qualified.

However, due to the existence of water vapor in the air, it can produce hydrogen under the action of ultraviolet rays, and the generated hydrogen will enter the hydrogen mass spectrometer through the leak. In addition, the water vapor itself can also enter the hydrogen mass spectrometer through the leak. Hydrogen ions can also be generated under the ionization of the ion source of the instrument, which greatly interferes with the detection and affects the application of this method. Therefore, urgently need to solve.

Utility model content

In order to solve the above technical problems, the utility model provides a device for leak detection of single-port containers using hydrogen-nitrogen mixed gas. The device not only reduces the cost of leak detection of single-port containers, but also has high detection accuracy.

In order to achieve the above object, the utility model provides the following technical solutions:

A device for leak detection of a single-port container using a hydrogen-nitrogen mixed gas, characterized in that it includes a hydrogen-nitrogen gas filling assembly for charging the hydrogen-nitrogen mixed gas into the single-port container to be inspected; the single-port container to be inspected is placed in a leak detection box In the working chamber of the leak detection box; the working chamber of the leak detection box communicates with the detection assembly for leak detection of the single-port container to be inspected; it also includes a replacement assembly; the replacement assembly communicates with the single-port container to be inspected and the working chamber of the leak detection box respectively, Inert gas is filled into the working chambers of the single-port container to be inspected and the leak detection box respectively, so as to replace the air in the single-port container to be inspected and the working chamber of the leak detection box.

Preferably, the replacement assembly includes an inert gas bottle and an exhaust pipeline arranged outside the leak detection box; the exhaust pipeline communicates with the working chamber of the leak detection box, and an exhaust valve is provided on the exhaust pipeline; the inert The gas bottle communicates with the working chamber of the leak detection box through the first inert gas tube, and the first inert gas tube is provided with a first inert gas valve.

Preferably, the one-way interface of the single-port container to be inspected is communicated with the transition pipeline; the replacement assembly also includes a second inert gas tube; one end of the second inert gas tube is communicated with the transition pipeline, and the other end is communicated with the inert gas bottle , and the second inert gas pipe is provided with a second inert gas valve; the transition pipe is communicated with the exhaust pipe; the exhaust pipe is communicated with a vacuum pump, and an exhaust valve is provided on the exhaust pipe.

Preferably, the hydrogen-nitrogen gas filling assembly includes a high-pressure hydrogen-nitrogen gas supply bottle; the high-pressure hydrogen-nitrogen gas supply bottle communicates with the transition pipeline through a hydrogen-nitrogen gas supply pipeline; an inflation valve is arranged on the hydrogen-nitrogen gas supply pipeline.

Preferably, the detection component includes a detection pipeline; one end of the detection pipeline communicates with the hydrogen leak detector, and the other end communicates with the working chamber of the leak detection box, and the detection pipeline is provided with a leak detection valve.

Preferably, it also includes an auxiliary evacuation pipe; one end of the auxiliary evacuation pipe communicates with the auxiliary vacuum pump, and the other end communicates with the working chamber of the leak detection box, and an auxiliary valve is provided on the auxiliary evacuation pipe.

Preferably, the gas in the inert gas bottle is high-purity nitrogen.

Compared with the prior art, the beneficial effects of the utility model are:

(1) The utility model is provided with a leak detection box, an inert gas bottle, and an exhaust pipe of the working chamber which is arranged outside the leak detection box and communicates with the leak detection box. An exhaust valve is arranged on the exhaust pipe; the inert gas bottle communicates with the working chamber of the leak detection box through the first inert gas pipe, and the first inert gas valve is arranged on the first inert gas pipe. Through such a setting, the exhaust valve and the first inert gas valve can be opened to replace the air in the working chamber of the leak detection box through the inert gas in the inert gas bottle before the leak detection test is started for the single-port container to be tested, effectively The influence of the air in the working chamber of the original leak detection box on the test results is eliminated, thereby improving the accuracy of the test results.

(2) The utility model is provided with the one-way interface of the single-port container to be inspected to communicate with the transition pipeline, and the transition pipeline communicates with the second inert gas pipe, one end of the second inert gas pipe communicates with the transition pipeline, and the other end communicates with the inert gas bottle , and the second inert gas pipe is provided with a second inert gas valve. At the same time, the transition pipeline communicates with the exhaust pipe; the exhaust pipe communicates with the vacuum pump, and the exhaust valve is provided on the exhaust pipe. Through such a setting, before starting the leak detection test of the single-port container to be inspected, the air inside the single-port container to be inspected can be firstly vacuumed by opening the evacuation valve and the vacuum pump, and then the second inert gas valve is opened in the single-port container to be inspected. The container is filled with inert gas. Since the single-port container to be inspected has only one one-way interface, it is difficult to completely evacuate the air inside it once vacuuming. Only by opening the evacuation valve and vacuum pump again can the injected inert gas be pumped out. Such repeated operations finally exhaust the air inside the single-mouth container to be inspected, effectively eliminating the influence of the air inside the single-mouth container to be inspected on the test results, thereby improving the accuracy of the experimental results.

(3) The utility model is provided with a high-pressure hydrogen-nitrogen gas supply bottle, and the high-pressure hydrogen-nitrogen gas supply bottle is connected with the transition pipeline through a hydrogen-nitrogen gas supply pipeline, and an inflation valve is arranged on the hydrogen-nitrogen gas supply pipeline. At the same time, the hydrogen leak detector is connected to the detection pipeline, and the other end of the detection pipeline is connected to the working chamber of the leak detection box, and the detection pipeline is provided with a leak detection valve. Through such a setting, the leak detection of the single-port container is realized by using the hydrogen-nitrogen mixed gas, which reduces the cost of leak detection of the single-port container.

(4) The utility model is provided with an auxiliary evacuation pipe connected with the auxiliary vacuum pump, the other end of the auxiliary evacuation pipe is connected with the working chamber of the leak detection box, and an auxiliary valve is arranged on the auxiliary evacuation pipe. Through this setting, the inert gas in the working chamber of the leak detection box can be vacuumed before the hydrogen leak detector detects the leak in the working chamber of the leak detection box, so that the detection result of the hydrogen leak detector on the working chamber of the leak detection box is more accurate. For accuracy, thus improving the experimental results.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the parallel technical solution of the utility model.

The actual corresponding relationship between each label of the present utility model and part name is as follows:

10-Single port container to be inspected 11-Transition pipe 20-Leak detection box 21-Exhaust pipe

22-Exhaust valve

30-Inert gas bottle 31-First inert gas tube 32-Second inert gas tube

33-First inert gas valve 34-Second inert gas valve

40-High-pressure hydrogen and nitrogen gas supply cylinder 41-Hydrogen and nitrogen gas supply pipeline 42-Inflation valve 50-Vacuum pump

51-Exhaust pipe 52-Evacuate valve

60-hydrogen leak detector 61-detection pipeline 62-leak detection valve

70-auxiliary vacuum pump 71-auxiliary evacuation pipe 72-auxiliary valve

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Example 1

As shown in Figure 1-2, a device for leak detection of a single-port container using hydrogen-nitrogen mixed gas is characterized in that it includes a hydrogen-nitrogen gas filling assembly that fills the inside of the single-port container 10 to be inspected with hydrogen-nitrogen mixed gas; The single-port container 10 is placed in the working chamber of the leak detection box 20; the working chamber of the leak detection box 20 communicates with the detection assembly that detects the leak of the single-port container 10 to be inspected; it also includes a replacement assembly; The working chambers of the leak box 20 are respectively connected, and inert gas is filled into the working chambers of the single-port container 10 to be checked and the leak detection box 20 respectively, thereby replacing the air in the working chambers of the single-port container 10 to be checked and the leak detection box 20 .

The replacement assembly consists of an inert gas bottle 30 , an exhaust pipe 20 , an exhaust valve 22 , a second inert gas pipe 32 , and a second inert gas valve 34 .

The exhaust pipeline 21 is installed outside the leak detection box 20 , the exhaust pipeline 21 communicates with the working chamber of the leak detection box 20 , and the exhaust valve 22 is installed on the exhaust pipeline 21 . The first inert gas pipe 31 communicates the inert gas bottle 30 with the working chamber of the leak detection box 20 , and the first inert gas valve 33 is installed on the first inert gas pipe 31 .

Through such an arrangement, the single-port container 10 to be inspected can be opened the exhaust valve 22 and the first inert gas valve 31 before the leak detection test is started, and the inert gas in the inert gas bottle 30 will discharge the gas in the working chamber of the leak detection box 20. The air is replaced to effectively eliminate the influence of the air in the original working chamber of the leak detection box 20 on the test results, thereby improving the accuracy of the test results.

One end of the second inert gas pipe 32 communicates with the transition pipeline 11 , the other end communicates with the inert gas bottle 30 , and the one-way interface of the single-port container 10 to be checked communicates with the transition pipeline 11 . The second inert gas valve 34 is installed on the second inert gas pipe 32 . At the same time, the transition pipe 11 communicates with the exhaust pipe 51 ; the exhaust pipe 51 communicates with the vacuum pump 50 , and the exhaust valve 52 is arranged on the exhaust pipe 51 .

With such an arrangement, the air in the single-port container 10 to be inspected can be evacuated by first opening the evacuation valve 52 and the vacuum pump 50 before starting the leak detection test. Open the second inert gas valve 34 again and fill the inert gas in the single-port container 10 to be checked. Since the single-port container 10 to be checked has only one one-way interface, it is difficult to completely evacuate the air inside it once by vacuuming. Only by opening it again The evacuation valve 52 and the vacuum pump 50 pump out the injected inert gas again. Through such repeated operations, the air inside the single-port container 10 to be inspected is finally exhausted, effectively reducing the air in the single-port container 10 to be inspected to the detection result. The influence is eliminated, thereby improving the accuracy of the experimental results.

The hydrogen-nitrogen gas filling assembly is composed of a high-pressure hydrogen-nitrogen gas supply bottle 40, a hydrogen-nitrogen gas supply pipeline 41 and an inflation valve 42; the high-pressure hydrogen-nitrogen gas supply cylinder 40 communicates with the transition pipeline 11 through the hydrogen-nitrogen gas supply pipeline 41, and the hydrogen-nitrogen gas supply The pipeline 41 is provided with an inflation valve 42 . Opening the inflation valve 42 allows the mixed gas of hydrogen and nitrogen to enter the interior of the single-port container 10 to be tested. The detection assembly consists of a hydrogen leak detector 60, a detection pipeline 61 and a leak detection valve 62; one end of the detection pipeline 61 communicates with the hydrogen leak detector 60, and the other end communicates with the working chamber of the leak detection box 20, and the leak detection valve 62 is installed On the detection pipeline 61. Through such arrangement, the leak detection of the single-port container 10 to be tested is realized by using the hydrogen-nitrogen mixed gas, and the cost of leak detection of the single-port container 10 to be tested is reduced.

An auxiliary evacuation pipe 71 is also provided; one end of the auxiliary evacuation pipe 71 communicates with the auxiliary vacuum pump 70 , and the other end communicates with the working chamber of the leak detection box 20 , and the auxiliary evacuation pipe 71 is provided with an auxiliary valve 72 . Through such an arrangement, the inert gas in the working chamber of the leak detection box 20 can be evacuated before the hydrogen leak detector 60 detects the leak in the working chamber of the leak detection box 20, so that the hydrogen leak detector 60 can detect the leakage of the leak detection box 20. The detection result of the working chamber is more accurate, thereby improving the experimental effect.

The gas in the inert gas bottle 30 in the present invention is preferably high-purity nitrogen, which is easy to obtain, thereby effectively reducing the use cost.

Example 2

The concrete operation steps of the utility model are as follows:

S1, put the single-port container 10 to be inspected into the working cavity of the leak detection box 20, and connect the one-way interface of the single-port container 10 to be inspected to the transition pipe 11;

S2, open the exhaust valve 22 on the exhaust pipe 21 of the leak detection box 20 and the first inert gas valve 33 on the first inert gas pipe 31, and the high-purity nitrogen in the inert gas bottle 30 passes along the first inert gas pipe 31 Enter the working chamber of the leak detection box 20, the air in the working chamber of the leak detection box 20 is squeezed by high-purity nitrogen, and discharged along the exhaust pipe 21;

S3, close the first inert gas valve 33 and the exhaust valve 22, open the auxiliary valve 72 and the auxiliary vacuum pump 70 on the auxiliary evacuation pipe 71, and vacuumize the working chamber of the leak detection box 20;

S4, close the auxiliary valve 72 and the auxiliary vacuum pump 70 on the auxiliary evacuation pipe 71, open the evacuation valve 52 on the vacuum pump 50 and the evacuation pipe 51, and evacuate the air inside the single-port container 10 to be checked;

S5, close the evacuation valve 52 on the vacuum pump 50 and the exhaust pipe 51, open the second inert gas valve 34 on the second inert gas pipe 32 pipe; the high-purity nitrogen in the inert gas bottle 30 passes along the second inert gas pipe 32 and The transition pipeline 11 enters the interior of the single-port container 10 to be inspected until the atmospheric pressure is reached, and the second inert gas valve 34 is closed;

S6, repeat step S4 and step S5 at least three times, open the vacuum pump 50 and the evacuation valve 52 on the evacuation pipe 51, and evacuate the high-purity nitrogen inside the single-port container 10 to be checked until the specified vacuum degree is reached, and then close the evacuation valve 52 and vacuum pump 50;

S7, the background value in the working chamber of the leak detection box 20 drops to a specified value, and the gas charging valve 42 on the hydrogen nitrogen gas supply pipeline 41 is opened; Check the inside of the single-port container 10, and after reaching the specified pressure, close the inflation valve 42;

S8, open the hydrogen leak detector 60 and the leak detection valve 62 on the detection pipeline 61, and the hydrogen gas leaked into the working chamber of the leak detection box 20 by the hydrogen leak detector 60 is detected by the hydrogen leak detector 60, thereby determining the single port to be inspected Whether the container 10 leaks or whether the leak exceeds the standard.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto. The equivalent replacement or change of the new technical solution and the concept of the utility model shall be covered by the protection scope of the utility model.

Claims (7)

1. A device for leak detection of a single-port container using a hydrogen-nitrogen mixed gas, characterized in that it comprises a hydrogen-nitrogen gas filling assembly inside the single-port container (10) to be checked; the single-port container to be inspected (10) placed in the working cavity of the leak detection box (20); the working cavity of the leak detection box (20) communicates with the detection assembly for leak detection of the single-port container (10) to be inspected; also includes a replacement assembly; the The replacement assembly communicates with the working chambers of the single-port container to be inspected (10) and the leak detection box (20) respectively, and inert gas is filled into the working chambers of the single-port container to be inspected (10) and the leak detection box (20) respectively, thereby Replace the air in the working cavity of the single-port container (10) to be checked and the leak detection box (20). 2. A device for leak detection of a single-port container using hydrogen-nitrogen mixed gas according to claim 1, characterized in that, the replacement assembly includes an inert gas bottle (30) and is arranged outside the leak detection box (20) The exhaust duct (21); the exhaust duct (21) communicates with the working chamber of the leak detection box (20), and the exhaust duct (21) is provided with an exhaust valve (22); the inert gas bottle ( 30) Communicate with the working chamber of the leak detection box (20) through the first inert gas pipe (31), and the first inert gas pipe (31) is provided with a first inert gas valve (33). 3. A device for leak detection of single-port containers using hydrogen-nitrogen mixed gas according to claim 2, characterized in that, the one-way interface of the single-port container (10) to be inspected is communicated with the transition pipeline (11); The replacement assembly also includes a second inert gas pipe (32); one end of the second inert gas pipe (32) communicates with the transition pipe (11), and the other end communicates with the inert gas bottle (30), and the second inert gas The pipe (32) is provided with a second inert gas valve (34); the transition pipeline (11) communicates with the exhaust pipe (51); the exhaust pipe (51) communicates with the vacuum pump (50), and the exhaust pipe ( 51) is provided with evacuation valve (52). 4. A device for leak detection of a single-port container using hydrogen-nitrogen mixed gas according to claim 3, characterized in that, the hydrogen-nitrogen inflation assembly includes a high-pressure hydrogen-nitrogen gas supply bottle (40); the high-pressure hydrogen The nitrogen gas supply cylinder (40) communicates with the transition pipeline (11) through the hydrogen nitrogen gas supply pipeline (41); the hydrogen nitrogen gas supply pipeline (41) is provided with an inflation valve (42). 5. A device for leak detection of single-port containers using hydrogen-nitrogen mixed gas according to claim 2, 3 or 4, characterized in that, the detection assembly includes a detection pipeline (61); the detection pipeline (61 ) one end is communicated with the hydrogen leak detector (60), and the other end is communicated with the working chamber of the leak detection box (20), and the detection pipeline (61) is provided with a leak detection valve (62). 6. A device for leak detection of single-port containers using hydrogen-nitrogen mixed gas according to claim 5, characterized in that it also includes an auxiliary evacuation tube (71); one end of the auxiliary evacuation tube (71) is connected to the auxiliary evacuation tube The vacuum pump (70) is communicated, and the other end is communicated with the working cavity of the leak detection box (20), and an auxiliary valve (72) is arranged on the auxiliary evacuation pipe (71). 7. A device for leak detection of single-port containers using hydrogen-nitrogen mixed gas according to claim 6, characterized in that the gas in the inert gas bottle (30) is high-purity nitrogen.

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