CN113049196A

CN113049196A - Method for accurately detecting leakage position of sealed container

Info

Publication number: CN113049196A
Application number: CN201911375819.5A
Authority: CN
Inventors: 李国全; 王炳晨
Original assignee: Shanghai Shen Li High Tech Co Ltd
Current assignee: Shanghai Shenli Technology Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-06-29

Abstract

The present application relates to a method of detecting a leak location in a sealed container, the method comprising: filling mixed gas into the sealed container to enable the value of a pressure gauge connected with the sealed container to reach a preset pressure value, wherein the mixed gas contains hydrogen; closing the air source and maintaining the pressure of the sealed container; and detecting the hydrogen gas with a hydrogen concentration detection device. The method fundamentally solves the problem that the traditional leak detection equipment cannot accurately detect, and the detection cost is also reduced by adopting the mixed gas containing hydrogen to detect.

Description

Method for accurately detecting leakage position of sealed container

Technical Field

The application relates to the field of packaging, in particular to a method for accurately detecting the leakage position of a sealed container.

Background

In daily life and industrial production, sealed containers are widely used, such as various gas storage tanks, vacuum bottles, pressure tanks, and the like. For a sealed container, airtightness is the most important function that it must have. Therefore, after the sealed container is processed and manufactured, the sealed container is required to be subjected to airtightness detection so as to evaluate the sealing performance of the sealed container.

The method of detecting a leak in a sealed container that is commonly used today is shown in fig. 1. A common method for detecting the airtightness of the sealed container is to introduce a detection gas into the sealed container, and after the sealed container is closed and subjected to pressure holding treatment, the following treatment methods are generally used: 1) soaking the sealed container in water and observing whether bubbles are generated; 2) smearing leakage detection liquid at the sealing contact position outside the sealed container, and observing whether the leakage detection liquid generates bubbles or changes the color of the leakage detection liquid; 3) and after the sealed container is sealed and maintained for a certain time, if the pressure value in the sealed container is not changed, judging that the air tightness of the sealed container is qualified, otherwise, judging that the air tightness of the sealed container is unqualified.

However, for the devices with complex systems and high sealing requirements, the above-mentioned conventional methods may not be convenient for detection, and therefore, other detection methods and devices are required to solve the problem.

Disclosure of Invention

The object of the present application is to provide a method which can accurately detect the leak position of a sealed container.

According to an embodiment of the present application, there is provided a method of detecting a leak location of a sealed container, the method including: filling mixed gas into the sealed container to enable the value of a pressure gauge connected with the sealed container to reach a preset pressure value, wherein the mixed gas contains hydrogen; closing the air source and maintaining the pressure of the sealed container; and detecting the hydrogen gas with a hydrogen concentration detection device.

Further, the mixed gas contains hydrogen gas and inactive gas.

Further, the inactive gas is nitrogen.

Further, the inactive gas is an inert gas.

Further, the concentration of hydrogen in the mixed gas is 8% to 10%.

Further, the predetermined pressure value is between 100 kilopascals and 150 kilopascals.

Further, the method further comprises: and observing whether the value of the pressure gauge connected with the sealed container changes.

Further, the method further comprises: and when the sealed container is judged to have leakage, the hydrogen concentration detection equipment sends out an alarm signal.

Further, the method further comprises: and when the concentration of hydrogen in the air is more than 10ppm, judging that the sealed container has leakage.

The method for detecting the leakage position of the sealed container provided in the embodiment of the disclosure fundamentally solves the problem that the traditional leakage detection equipment cannot accurately detect, and meanwhile, the detection cost is also reduced by adopting the mixed gas containing hydrogen to detect.

Drawings

The method of detecting a leak in a sealed container that is commonly used today is shown in fig. 1.

FIG. 2 shows a schematic diagram of a method of accurately detecting a leak location of a sealed container, according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

FIG. 2 shows a schematic diagram of a method of accurately detecting a leak location of a sealed container, according to an embodiment of the present application. The diagram is merely an example and is not intended to limit the scope of what is claimed in this application.

As shown in fig. 2, in the first step of the method, a mixed gas containing hydrogen is filled into the interior of the sealed container to be tested, so that the value of a pressure gauge connected to the sealed container reaches a predetermined pressure value. Here, the greater the predetermined pressure value, the higher the accuracy of the measurement. In practice, however, the predetermined pressure value must be within a reasonable range for safety reasons. In practical tests, when the sealed container is used for accommodating a fuel cell, the predetermined pressure value is preferably within a range of 100 to 150 KPa.

The mixed gas may contain at least one other gas in addition to hydrogen. The other gas may be a gas that is relatively inert in nature, such as nitrogen, an inert gas, or the like. Here, the reason why the detection is performed using hydrogen gas is that if there is a leak in the sealed container, hydrogen gas is easily detected because its molecular weight is small. Meanwhile, the cost of the hydrogen is high, so that the hydrogen is mixed with other gases to reduce the detection cost. In the preferred embodiment of the present application, the concentration of hydrogen in the mixed gas is between 8% and 10%, so that a balance between high detection success rate and low cost can be achieved.

In the second step of the process, the gas source is turned off and the sealed container is subjected to a pressure hold treatment. At this time, the air inlet of the sealing apparatus is closed, and the sealed container is maintained in a sealed state.

In the third step of the method, hydrogen gas is detected using a hydrogen gas concentration detection device. In addition, whether the value of a pressure gauge connected with the sealed container changes can be observed. Here, the hydrogen concentration detection device used may be a portable hydrogen detector, a pump-suction hydrogen detector, an online hydrogen detection alarm, or the like. When the hydrogen concentration in the air is detected to be greater than a certain threshold value and the sealed container is judged to have leakage, the hydrogen concentration detection equipment can send out an alarm signal in the form of sound or light to remind a user. Here, this threshold value may be set differently depending on the accuracy of the hydrogen concentration detection device. For example, it may be set such that the hydrogen concentration detection device issues an alarm signal when detecting that the concentration of hydrogen in the air is greater than 10 ppm.

The method for detecting the leakage position of the sealed container, which is provided by the embodiment of the disclosure, is easy to operate, fundamentally solves the problem that the traditional leakage detection equipment cannot accurately detect, and simultaneously reduces the detection cost by adopting the mixed gas containing hydrogen to detect.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A method of detecting a leak location in a sealed container, the method comprising:

filling mixed gas into the sealed container to enable the value of a pressure gauge connected with the sealed container to reach a preset pressure value, wherein the mixed gas contains hydrogen;

closing the air source and maintaining the pressure of the sealed container; and

the hydrogen gas is detected by a hydrogen gas concentration detection device.

2. The method of claim 1, wherein the mixed gas comprises hydrogen gas and a gas that is inert in nature.

3. The method of claim 2, wherein the inactive gas is nitrogen.

4. The method of claim 2, wherein the inactive gas is an inert gas.

5. The method of claim 1, wherein the concentration of hydrogen in the mixed gas is 8% to 10%.

6. The method of claim 1, wherein the predetermined pressure value is between 100 kilopascals and 150 kilopascals.

7. The method of claim 1, further comprising:

and observing whether the value of the pressure gauge connected with the sealed container changes.

8. The method of claim 1, further comprising:

and when the sealed container is judged to have leakage, the hydrogen concentration detection equipment sends out an alarm signal.

9. The method of claim 8, further comprising:

and when the concentration of hydrogen in the air is more than 10ppm, judging that the sealed container has leakage.