Air tightness detection device and air tightness detection system

Abstract

The utility model provides an air tightness detection device and an air tightness detection system. The air tightness detection device comprises a main pipeline first end used for being communicated with an air source; the pressure reducing valve and the pressure gauge are arranged on the main pipeline; the pressure reducing valve is close to the main pipeline first end relative to the pressure gauge; two ends of the first branch pipeline are respectively communicated with the second end of the main pipeline and the to-be-tested component; the first flow meter and the first switch valve are arranged on the first branch pipeline; the second branch pipeline is connected with the first branch pipeline in parallel; two ends of the second branch pipeline are respectively communicated with the second end of the main pipeline and the to-be-tested component; the first proportional valve and the second switch valve are both arranged on the second branch pipeline. According to the gas tightness detection device provided by the invention, the first branch pipeline and the second branch pipeline are connected in parallel, and gas flowing quickly in the gas charging stage does not pass through the flowmeter, so that the flowmeter is prevented from being damaged due to the too high rate of the gas, and the subsequent measurement accuracy of the flowmeter is ensured; the gas flow rate is accurately controlled through the first proportional valve, and the integrity of the to-be-measured assembly in the measurement process is guaranteed.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of fuel cell, and in particular to a gas tightness detection device. BACKGROUND

[0002] As a clean and efficient energy, fuel cell is widely used in the fields of transportation and portable power supply. In order to ensure the safety of fuel cell, the gas tightness of fuel cell needs to be detected.

[0003] The existing detection system includes a gas source, a pipeline and a pressure gauge. The gas source is communicated with a hydrogen channel of the fuel cell through the pipeline. The pressure gauge is arranged on the pipeline. In the test process, the pressure value of the pressure gauge is read immediately after the gas source fills a certain pressure gas into the hydrogen channel, and then the pressure value of the pressure gauge is read again after a preset time. If the pressure values of the pressure gauge before and after change greatly, it is proved that the hydrogen channel has a leakage.

[0004] However, in the process of implementing the present disclosure, the inventor found that because the filling rate (pressure change rate) is too fast in the filling stage, the internal structure of the pressure gauge may be damaged, resulting in a decrease in the accuracy of the final measurement. CONTENT OF THE UTILITY MODEL

[0005] One of the technical problems to be solved by the present disclosure is how to improve the accuracy of the measurement results of the gas tightness detection device.

[0006] To solve the above technical problem, the present disclosure provides a gas tightness detection device in the first aspect, comprising:

[0007] A main pipeline, a first end of the main pipeline is used for being communicated with a gas source;

[0008] A pressure reducing valve is arranged in the main pipeline;

[0009] A pressure gauge is arranged in the main pipeline. The pressure reducing valve is close to the first end of the main pipeline relative to the pressure gauge. A first branch pipeline, two ends of the first branch pipeline are used for being communicated with a second end of the main pipeline and a to-be-tested component respectively;

[0010] A first flow meter is arranged in the first branch pipeline;

[0011] A first on-off valve is arranged in the first branch pipeline;

[0012] A second branch pipeline is connected with the first branch pipeline in parallel. Two ends of the second branch pipeline are used for being communicated with the second end of the main pipeline and the to-be-tested component respectively;

[0013] A first proportional valve is arranged in the second branch pipeline; and

[0014] A second on-off valve is arranged in the second branch pipeline.

[0015] In some embodiments, the first proportional valve is closer to the second end of the main pipe than the second on-off valve.

[0016] In some embodiments, further comprising:

[0017] a third branch pipe, a first end of the third branch pipe being in communication with the second branch pipe, the second on-off valve being located between the first proportional valve and the first end of the third branch pipe, a second end of the third branch pipe being configured to be in communication with the atmosphere; and

[0018] a third on-off valve, disposed in the third branch pipe.

[0019] In some embodiments, further comprising:

[0020] a first differential pressure gauge, disposed in the first branch pipe.

[0021] In some embodiments, further comprising:

[0022] a plurality of fourth branch pipes, a first end of each of the plurality of fourth branch pipes being in communication with both the first end of the first branch pipe and the first end of the second branch pipe, a second end of each of the plurality of fourth branch pipes being configured to be in communication with a chamber of the component under test; and

[0023] a plurality of fourth on-off valves, the number of the plurality of fourth on-off valves being the same as the number of the plurality of fourth branch pipes, one of the plurality of fourth on-off valves being disposed in each of the plurality of fourth branch pipes.

[0024] In some embodiments, the first end of the first branch pipe and the first end of the second branch pipe are both configured to be in communication with a first chamber of the component under test; further comprising:

[0025] a fifth branch pipe, two ends of the fifth branch pipe being configured to be in communication with the second end of the main pipe and a second chamber of the component under test, respectively;

[0026] a second flow meter, disposed in the fifth branch pipe;

[0027] a fifth on-off valve, disposed in the fifth branch pipe;

[0028] a sixth branch pipe, in parallel with the fifth branch pipe, two ends of the sixth branch pipe being configured to be in communication with the second end of the main pipe and the second chamber of the component under test, respectively;

[0029] a second proportional valve, disposed in the sixth branch pipe; and

[0030] a sixth on-off valve, disposed in the sixth branch pipe.

[0031] In some embodiments, a seventh on-off valve, the pressure-reducing valve being located between the seventh on-off valve and the pressure gauge.

[0032] In some embodiments, further comprising:

[0033] The data acquisition unit is connected with the first flow meter signal, and the data acquisition unit is configured to acquire and record the operation data of the first flow meter.

[0034] In some embodiments, further comprising:

[0035] The alarm device is connected with the first flow meter signal, the first flow meter is capable of converting the measured flow data into a first signal, and the alarm device is capable of issuing an alarm based on the first signal.

[0036] The second aspect of the present disclosure provides a gas tightness detection device, comprising:

[0037] The gas source, and

[0038] The gas tightness detection device of the first aspect, the first end of the main pipeline of the gas tightness detection device is in communication with the gas source.

[0039] Through the above technical solution, the gas tightness detection device provided by the present disclosure is provided. By arranging two parallel first branch pipelines and second branch pipelines, in the inflation stage, the first switch valve is closed and the second switch valve is opened, so that the gas flowing rapidly from the main pipeline is reduced in pressure by the pressure reducing valve and then enters the to-be-detected assembly through the second branch pipeline. Since the rapidly flowing gas does not pass through the flow meter at this time, the damage of the gas to the flow meter due to the excessively fast speed of the gas is avoided, and the accuracy of the subsequent flow meter measurement is ensured. In addition, the first proportional valve can finely control the speed of the gas entering the to-be-detected assembly, so as to avoid the impact of the excessively fast speed of the gas on the to-be-detected assembly, and ensure the integrity of the to-be-detected assembly during the measurement. After the pressure gauge detects that the pipeline pressure is stable, the detection stage is entered, the first switch valve is opened and the second switch valve is closed. At this time, the main pipeline connected with the gas source and the pressure reducing valve on the main pipeline ensure the stability of the pressure of the first branch pipeline, ensure the stability of the system, and improve the accuracy of the measurement. At this time, the measurement is performed by the flow meter, the flow meter realizes the measurement of the small leakage amount of the to-be-detected assembly, and the accuracy of the detection is improved. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 is a structure schematic diagram of the inflation stage of the gas tightness detection device disclosed by the embodiments of the present disclosure;

[0042] Figure 2 is a structure schematic diagram of the pressure stabilization stage of the gas tightness detection device disclosed by the embodiments of the present disclosure;

[0043] Figure 3 is a structural schematic diagram of a first sub-detection stage of the air tightness detection device disclosed by the embodiments of the present disclosure;

[0044] Figure 4 is a structural schematic diagram of a second sub-detection stage of the air tightness detection device disclosed by the embodiments of the present disclosure;

[0045] Figure 5 is a structural schematic diagram of an exhaust stage of the air tightness detection device disclosed by the embodiments of the present disclosure;

[0046] Figure 6 is a schematic diagram of a fourth branch pipeline and a fourth switch valve of the air tightness detection device disclosed by the embodiments of the present disclosure;

[0047] Figure 7 is a structural schematic diagram of a fifth branch pipeline and a sixth branch pipeline of the air tightness detection device disclosed by the embodiments of the present disclosure.

[0048] Legend of reference signs:

[0049] 1, main pipeline; 2, pressure reducing valve; 3, pressure gauge; 4, first branch pipeline; 5, first flow meter; 6, first switch valve; 7, second branch pipeline; 8, first proportional valve; 9, second switch valve; 10, third branch pipeline; 11, third switch valve; 12, first differential pressure gauge; 13, fourth branch pipeline; 14, fourth switch valve; 15, fifth branch pipeline; 16, second flow meter; 17, fifth switch valve; 18, sixth branch pipeline; 19, second proportional valve; 20, sixth switch valve; 21, seventh switch valve; 22, gas source; 23, component to be detected; 24, second differential pressure gauge; 25, seventh branch pipeline; 26, eighth switch valve. DETAILED DESCRIPTION

[0050] The embodiments of the present disclosure are further described below in conjunction with the drawings and examples. The detailed description of the following examples and drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure, and the present disclosure can be implemented in many different forms, and is not limited to the specific examples disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0051] The present disclosure provides these examples in order to make the present disclosure thorough and complete, and fully express the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions and values set forth in these examples should be interpreted as merely exemplary, and not as a limitation.

[0052] It should be noted that in the description of the present disclosure, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the purpose of facilitating the description of the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation to the present disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0053] In addition, "first", "second", and similar words used in the present disclosure do not indicate any order, number or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error. "Include" or "contain" and similar words mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0054] It should also be noted that in the description of the present disclosure, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; It can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances. When it is described that a specific device is located between the first device and the second device, there can be an intermediate device between the specific device and the first device or the second device, or there can be no intermediate device.

[0055] All terms used in the present disclosure have the same meaning as understood by those skilled in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted to have meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or excessively formalized sense, unless specifically defined here.

[0056] Techniques, methods, and equipment known to those skilled in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and equipment should be considered part of the specification.

[0057] Embodiment 1

[0058] As Figures 1 to 3 shown, the present application embodiment 1 provides a gas tightness detection device, comprising:

[0059] The main pipe 1 is used for communicating with the gas source 22 at the first end of the main pipe 1;

[0060] A pressure reducing valve 2 is arranged in the main pipeline 1;

[0061] A pressure gauge 3 is arranged in the main pipeline 1; the pressure reducing valve 2 is arranged close to the first end of the main pipeline 1 relative to the pressure gauge 3;

[0062] A first branch pipeline 4 is arranged in the main pipeline 1; two ends of the first branch pipeline 4 are respectively arranged in communication with the second end of the main pipeline 1 and the component 23 to be tested;

[0063] A first flow meter 5 is arranged in the first branch pipeline 4;

[0064] A first on-off valve 6 is arranged in the first branch pipeline 4;

[0065] A second branch pipeline 7 is arranged in parallel with the first branch pipeline 4; two ends of the second branch pipeline 7 are respectively arranged in communication with the second end of the main pipeline 1 and the component 23 to be tested;

[0066] A first proportional valve 8 is arranged in the second branch pipeline 7; and

[0067] A second on-off valve 9 is arranged in the second branch pipeline 7.

[0068] Specifically, the main pipeline 1 ensures that the gas can be stably delivered from the gas source 22 to the first branch pipeline 4 or the second branch pipeline 7. The first end of the main pipeline 1 can be connected with the gas source 22 through threads or flanges, and the gas source 22 can use the gas source 22 in the factory. The gas source 22 can use compressed air or compressed nitrogen, etc.

[0069] The pressure reducing valve 2 is used to reduce the pressure of the gas flowing from the gas source 22 into the main pipeline 1, which not only avoids the damage of high pressure to the first branch pipeline 4 and the second branch pipeline 7, but also avoids the impact of high pressure on each component in the system, maintains the structural integrity and functional stability of each component, and further ensures the accuracy of the final test results.

[0070] The first branch pipeline 4 and the second branch pipeline 7 are arranged in parallel, so that the gas in the main pipeline 1 can be branched to different branch pipelines to be connected with the component 23 to be tested. The first on-off valve 6 is used to control the communication between the first branch pipeline 4 and the main pipeline 1; the first flow meter 5 is used to measure the flow of the gas in the pipeline; the second on-off valve 9 is used to control the communication between the first branch pipeline 4 and the main pipeline 1; and the first proportional valve 8 is used to accurately control the gas rate entering the component 23 to be tested (for example, adjusted to 5Kpa / S) to ensure the accuracy and safety of the test. The first proportional valve 8 can use an electric proportional valve or a pneumatic proportional valve, etc.

[0071] The airtightness testing device may also include a pressure relief valve (not shown in the figure), which can be installed on the main pipeline 1 between the pressure gauge 3 and the pressure reducing valve 2, for releasing pressure after measurement. All pipelines and components of this application are available through commercial procurement.

[0072] The airtightness testing device can include four stages in the testing process: inflation stage, pressure stabilization stage, testing stage, and deflation stage.

[0073] like Figure 1 As shown, during the inflation stage, the first switch valve 6 is closed, the second switch valve 9 is opened, and the gas source 22 is turned on. At this time, the rapidly flowing gas passes through the second branch pipe 7 and, after its rate is precisely controlled by the first proportional valve 8, enters the component under test 23. This avoids large pressure fluctuations impacting the component under test 23, ensuring its integrity during the measurement process. Since the first switch valve 6 is closed, damage to the flow meter from large pressure fluctuations is also avoided, ensuring the integrity of the flow meter's internal structure and thus guaranteeing the accuracy of the final measurement. Furthermore, the flow meter can accurately detect even minute leaks, improving detection precision. When the pressure value measured by pressure gauge 3 reaches the preset pressure value and does not fluctuate significantly for a period of time (e.g., a few seconds), it enters the pressure stabilization stage.

[0074] like Figure 2 As shown, during the pressure stabilization phase, the gas source 22 remains open, the first switch valve 6 remains closed, and the second switch valve 9 remains open. Gas continues to flow through the second branch pipe 7 and the first proportional valve 8. This phase is maintained for a preset time (e.g., a few minutes) to ensure that the pressure in the system and the component under test 23 is stable, thus ensuring the accuracy of the measurement in the subsequent detection phase.

[0075] like Figure 3 As shown, during the testing phase, the gas source 22 remains open, the second switch valve 9 is closed, and the first switch valve 6 is opened. At this time, the main pipeline 1 connected to the gas source 22 and the pressure reducing valve 2 on the main pipeline 1 can continue to ensure the stability of the pressure in the first branch pipeline 4, ensuring the stability of the system and improving the accuracy of the measurement. Measurement is performed using the first flow meter 5 on the first branch pipeline 4. If the flow rate displayed by the first flow meter 5 remains zero or close to zero for a period of time, the sealing performance of the component under test 23 is good; if the flow rate displayed by the first flow meter 5 shows a continuous and large reading, it indicates that the component under test 23 has a certain degree of leakage and poor sealing performance.

[0076] During the exhaust phase, shut off the gas source 22, open the second switch valve 9, keep the first switch valve 6 open, and open the pressure relief valve.

[0077] The air tightness detection device can be selected as an automatic control mode or a manual control mode. When the automatic control mode is adopted, electromagnetic valves are selected for the valves, and the control method of the automatic control mode can be slightly improved on the basis of the control method in the prior art without any creative labor.

[0078] By the technical solution, the air tightness detection device provided by the disclosure can make the gas flowing rapidly from the main pipeline 1 pass through the pressure reducing valve 2 to be reduced in pressure and then be introduced into the component 23 to be detected through the second branch pipeline 7 by closing the first switch valve 6 and opening the second switch valve 9 in the inflation stage. Since the rapidly flowing gas does not pass through the flow meter at this time, the damage of the flow meter caused by the excessively fast rate of the gas is avoided, and the accuracy of the subsequent measurement of the flow meter is ensured. In addition, the first proportional valve 8 can finely control the rate of the gas introduced into the component 23 to be detected, so that the integrity of the component 23 to be detected in the measurement process is ensured. After the pressure gauge 3 detects that the pressure in the pipeline is stable, the detection stage is entered, the first switch valve 6 is opened and the second switch valve 9 is closed, and at this time, the main pipeline 1 connected with the gas source 22 and the pressure reducing valve 2 on the main pipeline 1 ensure the stability of the pressure in the first branch pipeline 4 and the stability of the system, and improve the accuracy of the measurement. At this time, the measurement is performed through the flow meter, and the flow meter realizes the measurement of the small leakage of the component 23 to be detected, and the accuracy of the detection is improved.

[0079] As shown in FIG. 1, Figures 1 to 5 In some embodiments, the first proportional valve 8 is closer to the second end of the main pipeline 1 than the second switch valve 9.

[0080] Specifically, by placing the first proportional valve 8 in front, the pressure change of the main pipeline 1 can be responded more timely, the rate of the gas can be quickly adjusted, and more stable gas supply can be provided for the subsequent detection process. At the same time, the system failure caused by pressure fluctuation and unstable flow can be reduced, and the reliability and service life of the system are improved.

[0081] As shown in FIG. 1, Figures 1 to 5 In some embodiments, the air tightness detection device further comprises:

[0082] a third branch pipeline 10, a first end of the third branch pipeline 10 is in communication with the second branch pipeline 7, and the second switch valve 9 is located between the first proportional valve 8 and the first end of the third branch pipeline 10; a second end of the third branch pipeline 10 is used to be in communication with the atmosphere; and

[0083] a third switch valve 11 arranged in the third branch pipeline 10.

[0084] Specifically, a third branch pipe 10 is installed with its second end connected to the atmosphere, and a third switch valve 11 is installed on the third branch pipe 10, providing a rapid pressure relief channel for the entire system. When emergency pressure relief of the system is required, the third switch valve 11 is opened, and the gas can be quickly discharged into the atmosphere through the third branch pipe 10, reducing the risk of system damage due to excessive pressure. This greatly improves the safety and ease of operation of the system in emergency situations. In addition, it can also be used for venting during the venting stage after testing is completed. That is, the third branch pipe 10 and the third switch valve 11, along with the pressure relief valve, can be installed individually or in combination.

[0085] To ensure the accuracy of the measurement, such as Figures 1 to 5 As shown, in some embodiments, it also includes:

[0086] The first differential pressure gauge 12 is installed on the first branch pipe 4.

[0087] Specifically, the testing phase may include a first sub-test phase and a second sub-test phase, such as... Figure 3 As shown, in the first sub-test stage, the gas source 22 remains open, the first switch valve 6 is opened, the second switch valve 7 is closed, and then the flow meter is used for measurement. After the measurement is completed, the second sub-test stage begins. Figure 4 As shown, at this time, the gas source 22 is turned off, the first switch valve 6 is kept closed, and the second switch valve 9 is kept open. After a period of time (e.g., a few minutes), the value of the first differential pressure gauge 12 is read. If the value is zero or close to zero, the component under test 23 is determined to have good sealing performance; if the value is large, the component under test 23 is determined to have poor sealing performance. When the results detected by the first differential pressure gauge 12 and the flow meter are inconsistent, the component under test 23 needs to be retested, or the first differential pressure gauge 12 and the flow meter need to be repaired until the results detected by the first differential pressure gauge 12 and the flow meter are consistent.

[0088] like Figure 6 As shown, in some embodiments, it also includes:

[0089] Multiple fourth branch pipes 13, each having a first end connected to both the first end of the first branch pipe 4 and the first end of the second branch pipe 7, and each fourth branch pipe 13 having a second end connected to a chamber of the component under test 23; and

[0090] Multiple fourth switching valves 14 are provided, with the same number of fourth switching valves 14 as the fourth branch pipes 13, and one fourth switching valve 14 is provided for each fourth branch pipe 13.

[0091] Specifically, the first ends of multiple fourth branch pipes 13 can be connected to the first ends of both the first branch pipe 4 and the second branch pipe 7 via a multi-port connector. During the testing process, different chambers of the component under test 23 can be tested sequentially. For example, when the chambers of the component under test 23 include a hydrogen chamber, an oxygen chamber, and a coolant chamber, there can be three fourth branch pipes 13. The second ends of the three fourth branch pipes 13 are connected to the three chambers of the component under test 23 respectively. When testing the hydrogen chamber, the fourth switch valve 14 on the fourth branch pipe 13 connected to the hydrogen chamber can be opened, and the fourth switch valves 14 on the other fourth branch pipes 13 can be closed. By connecting multiple fourth branch pipes 13 to different chambers of the component under test 23, the sealing performance of the component under test 23 can be more comprehensively evaluated during the testing process. Since each fourth branch pipe 13 is equipped with an independent fourth switch valve 14, the gas flow in each chamber can be controlled individually, improving the flexibility and accuracy of the test.

[0092] like Figure 7 As shown, in some embodiments, the first end of the first branch pipe 4 and the first end of the second branch pipe 7 are both used to communicate with the first chamber of the component under test 23; it also includes:

[0093] The fifth branch pipe 15 has two ends that are respectively connected to the second end of the main pipe 1 and the second chamber of the component under test 23;

[0094] The second flow meter 16 is installed in the fifth branch pipe 15;

[0095] The fifth switch valve 17 is installed in the fifth branch pipe 15;

[0096] The sixth branch pipe 18 is connected in parallel with the fifth branch pipe 15; the two ends of the sixth branch pipe 18 are respectively used to connect to the second end of the main pipe 1 and the second chamber of the component under test 23.

[0097] A second proportional valve 19 is installed in the sixth branch pipe 18; and,

[0098] The sixth switch valve 20 is installed in the sixth branch pipeline 18.

[0099] Specifically, the second differential pressure gauge 24, the seventh branch pipe 25 and the eighth switch valve 26 can also be included; the second differential pressure gauge 24 can be arranged on the fifth branch pipe 15, the first end of the seventh branch pipe 25 is in communication with the sixth branch pipe 18, and the sixth switch valve 20 is located between the second proportional valve 19 and the first end of the sixth branch pipe 18; and the second end of the seventh branch pipe 25 is used for communication with the atmosphere. The second proportional valve 19 can be selected from an electric proportional valve or a pneumatic proportional valve and the like. By arranging the fifth branch pipe 15 and the sixth branch pipe 18, the different chambers (the first chamber and the second chamber) of the to-be-tested assembly 23 can be sequentially subjected to the air tightness detection of the different chambers of the to-be-tested assembly 23, the inflation, pressure stabilization and detection of multiple chambers are realized, and the sealing performance of the to-be-tested assembly 23 can be more comprehensively evaluated. In each stage of the detection, the opening and closing of the fifth switch valve 17 can be in conjunction with the first switch valve 6, and the opening and closing of the sixth switch valve 20 can be in conjunction with the second switch valve 9.

[0100] As shown in FIG. 1, in some embodiments, the seventh switch valve 21 is arranged between the gas source 22 and the pressure gauge 3. Figures 1 to 5

[0101] Specifically, in the inflation stage, the pressure stabilization stage and the first sub-detection stage, the seventh switch valve 21 can be opened; in the second sub-detection stage and the exhaust stage, the seventh switch valve 21 can be closed. The seventh switch valve 21 can cut off the connection between the gas source 22 and the pressure reducing valve 2 in an emergency, so as to prevent the gas with excessively high pressure from directly impacting the pressure reducing valve 2 and subsequent detection devices. For example, in the case of an abnormally high pressure or an emergency of the system, the seventh switch valve 21 can be closed in time to avoid damage to the system caused by excessively high pressure, thereby improving the safety of the system. The seventh switch valve 21 can also be used to control the opening and closing of the gas source.

[0102] As shown in FIG. 1, in some embodiments, the system further includes: Figures 1 to 5

[0103] A data acquisition unit (not shown in the figure) is in signal connection with the first flowmeter 5, and the data acquisition unit is used for acquiring and recording the operation data of the first flowmeter 5.

[0104] Specifically, the data acquisition unit can be selected from a data acquisition card, a remote terminal unit and the like. The data acquisition unit can store the acquired operation data, so as to facilitate subsequent data analysis and processing. Through analysis of a large amount of data, the air tightness of the to-be-tested assembly 23 can be more deeply understood, and potential problems and trends can be found. For example, whether the to-be-tested assembly 23 has a slow leakage problem can be judged by analyzing the flow variation curve in different time periods.

[0105] As shown in FIG. 1, in some embodiments, the system further includes: Figures 1 to 5 ​​​

[0106] An alarm device (not shown in the figure) is connected with the first flow meter 5, the first flow meter 5 can convert the measured flow data into a first signal, and the alarm device can issue an alarm based on the first signal.

[0107] Specifically, the alarm device can be an audible and light alarm, or a control system integrated alarm, etc. When the data measured by the first flow meter 5 exceeds the preset threshold, the alarm device can immediately issue an alarm to remind the staff that there may be a problem with the sealing of the component 23 to be measured.

[0108] Embodiment 2

[0109] As shown in Figures 1 to 5 Embodiment 2 of the present application provides a gas tightness detection system, comprising:

[0110] a gas source 22, and

[0111] the gas tightness detection device of Embodiment 1, the first end of the main pipeline 1 of the gas tightness detection device is in communication with the gas source 22.

[0112] Through the above technical solution, the gas tightness detection system provided by Embodiment 2 of the present application includes the gas tightness detection device provided by Embodiment 1. By arranging two parallel first branch pipelines 4 and second branch pipelines 7, in the inflation stage, the first switch valve 6 is closed and the second switch valve 9 is opened, so that the gas flowing rapidly from the main pipeline 1 is reduced in pressure by the pressure reducing valve 2 and then introduced into the component 23 to be measured through the second branch pipeline 7. Since the rapidly flowing gas does not pass through the flow meter at this time, the damage of the flow meter caused by the excessively fast rate of the gas is avoided, and the accuracy of the subsequent flow meter measurement is ensured. In addition, the first proportional valve 8 can finely control the rate of the gas entering the component 23 to be measured, so as to avoid the impact of the excessively fast rate of the gas on the component 23 to be measured, and ensure the integrity of the component 23 to be measured during the measurement. After the pressure gauge 3 detects that the pipeline pressure is stable, the detection stage is entered, the first switch valve 6 is opened and the second switch valve 9 is closed. At this time, the main pipeline 1 connected with the gas source 22 and the pressure reducing valve 2 on the main pipeline 1 ensure the stability of the pressure of the first branch pipeline 4, ensure the stability of the system, and improve the accuracy of the measurement. At this time, the measurement is carried out through the flow meter, the flow meter realizes the measurement of the small leakage amount of the component 23 to be measured, and the accuracy of the detection is improved.

[0113] So far, the embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description.

[0114] Although some specific embodiments of the present disclosure have been described in detail by way of examples, one skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the present disclosure. One skilled in the art should understand that the above embodiments can be modified or equivalent replacements can be made to some technical features without departing from the scope and spirit of the present disclosure. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict.

Claims

1. An air tightness detecting device characterized by comprising: It comprises: a main pipeline (1), a first end of the main pipeline (1) is used for communicating with a gas source (22); a pressure reducing valve (2) arranged in the main pipeline (1); a pressure gauge (3) arranged in the main pipeline (1); the pressure reducing valve (2) is close to the first end of the main pipeline (1) relative to the pressure gauge (3); a first branch pipeline (4), two ends of the first branch pipeline (4) are respectively used for communicating with a second end of the main pipeline (1) and a component to be tested (23); a first flowmeter (5) arranged in the first branch pipeline (4); a first on-off valve (6) arranged in the first branch pipeline (4); a second branch pipeline (7) parallel to the first branch pipeline (4); two ends of the second branch pipeline (7) are respectively used for communicating with the second end of the main pipeline (1) and the component to be tested (23); a first proportional valve (8) arranged in the second branch pipeline (7); and a second on-off valve (9) arranged in the second branch pipeline (7).

2. The air tightness detection device according to claim 1, wherein the first proportional valve (8) is close to the second end of the main pipeline (1) relative to the second on-off valve (9).

3. The air tightness testing apparatus of claim 2, wherein, It further comprises: a third branch pipeline (10), a first end of the third branch pipeline (10) communicates with the second branch pipeline (7), the second on-off valve (9) is located between the first proportional valve (8) and the first end of the third branch pipeline (10); a second end of the third branch pipeline (10) is used for communicating with the atmosphere; and a third on-off valve (11) arranged in the third branch pipeline (10).

4. The air tightness testing apparatus of claim 1, wherein It further comprises: a first differential pressure gauge (12) arranged in the first branch pipeline (4).

5. The air tightness testing apparatus of claim 1, wherein It further comprises: a plurality of fourth branch pipelines (13), first ends of the plurality of fourth branch pipelines (13) both communicate with a first end of the first branch pipeline (4) and a first end of the second branch pipeline (7), and second ends of the plurality of fourth branch pipelines (13) are respectively used for communicating with one chamber of the component to be tested (23); and a plurality of fourth on-off valves (14), the number of the fourth on-off valves (14) is the same as that of the fourth branch pipelines (13), and each of the fourth on-off valves (14) is arranged in each of the fourth branch pipelines (13).

6. The air tightness testing apparatus of claim 1, wherein The first end of the first branch pipeline (4) and the first end of the second branch pipeline (7) are both used for communicating with a first chamber of the component to be tested (23); it further comprises: a fifth branch pipeline (15), two ends of the fifth branch pipeline (15) are respectively used for communicating with the second end of the main pipeline (1) and a second chamber of the component to be tested (23); a second flowmeter (16) arranged in the fifth branch pipeline (15); a fifth on-off valve (17) arranged in the fifth branch pipeline (15); a sixth branch pipeline (18) parallel to the fifth branch pipeline (15); two ends of the sixth branch pipeline (18) are respectively used for communicating with the second end of the main pipeline (1) and the second chamber of the component to be tested (23); a second proportional valve (19) arranged in the sixth branch pipeline (18); and A sixth on-off valve (20) is arranged in the sixth branch line (18).

7. The air tightness detection device according to claim 1, wherein, A seventh on-off valve (21) is arranged between the pressure reducing valve (2) and the pressure gauge (3).

8. The air tightness testing apparatus of claim 1, wherein, Further comprising: A data acquisition unit is connected with the first flow meter (5) in signal, and the data acquisition unit is used for collecting and recording the operation data of the first flow meter (5).

9. The air tightness testing apparatus of claim 1, wherein, Further comprising: An alarm device is connected with the first flow meter (5) in signal, the first flow meter (5) can convert the measured flow data into a first signal, and the alarm device can issue an alarm based on the first signal.

10. A leak detection system, comprising: Comprising: An air source (22), and The air tightness detection device according to any one of claims 1-9, wherein a first end of a main line (1) of the air tightness detection device is in communication with the air source (22).

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