Air tightness detection device

Abstract

The utility model discloses an air tightness detection device, and belongs to the field of air tightness detection. The air tightness detection device comprises an air pressure source, a pipeline and a gas flow meter. The air pressure source is used for inflating the to-be-tested piece; one end of the pipeline is connected with the air pressure source, and the other end of the pipeline is used for being connected with the to-be-tested piece; and the gas flow meter is connected to the pipeline. The air tightness detection device with the structure can shorten the air tightness detection waiting time and accelerate the work line rhythm, thereby improving the production efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air tightness detection, in particular to an air tightness detection device. BACKGROUND

[0002] In the process of pipeline production and processing, many products need to be tested for air tightness to detect whether they meet the air tightness requirements. At present, the differential pressure method is used to detect the air tightness of products, which requires waiting for a certain period of time, resulting in slow flow line rhythm and low efficiency. CONTENT OF THE UTILITY MODEL

[0003] The embodiments of the present application provide an air tightness detection device to reduce the air tightness detection waiting time, speed up the flow line rhythm, and thus improve the production efficiency.

[0004] The embodiments of the present application provide an air tightness detection device, which comprises a gas source, a pipeline and a gas flow meter. The gas source is used to inflate the measured part; one end of the pipeline is connected to the gas source, and the other end is used to connect the measured part; the gas flow meter is connected to the pipeline.

[0005] In the above technical solution, the gas flow meter is connected to the pipeline. After the gas source completes the inflation of the measured part, the connection between the gas source and the measured part is maintained, and the flow of the gas in the pipeline detected by the gas flow meter is observed and compared with the specified flow threshold. If the flow is lower than the specified flow threshold, the air tightness of the measured part meets the standard; if the flow is higher than the specified flow threshold, the air tightness of the measured part does not meet the standard. Thus, compared with the differential pressure method, it is not necessary to detect the pressure in the measured part after inflating it with a certain pressure and waiting for a period of time to determine whether the air tightness of the measured part meets the standard, thereby reducing the air tightness detection waiting time, speeding up the flow line rhythm, and thus improving the production efficiency.

[0006] In some embodiments, the air tightness detection device further comprises a smoke generator; the smoke generator is used to provide smoke gas into the pipeline.

[0007] In the above technical solution, the smoke generator is used to provide smoke gas into the pipeline, so that when the measured part has a leakage point, the smoke gas can exit the measured part from the leakage point, thereby facilitating the positioning of the leakage point and facilitating the subsequent repair of the measured part.

[0008] In some embodiments, the air tightness detection device further comprises a mixing container; the mixing container is connected to the pipeline, and the cavity of the mixing container is in communication with the pipeline; wherein the smoke generator is connected to the mixing container, and the smoke generator is used to provide smoke gas into the mixing container.

[0009] In the technical scheme, the cavity of the mixing container is communicated with the pipeline, the smoke generator is connected with the mixing container, and the smoke generator is used to provide smoke gas into the mixing container, so that the smoke gas can be uniformly mixed with the gas provided by the gas pressure source in the mixing container, thereby reducing the risk that the gas from the leakage point of the to-be-tested object out of the to-be-tested object does not carry or only carries a small amount of smoke gas, so that the leakage point is not found.

[0010] In some embodiments, the pipeline comprises a main pipeline, a first branch pipeline and a second branch pipeline; the outlet of the gas pressure source is selectively communicated with the first branch pipeline or the second branch pipeline, the first branch pipeline and the second branch pipeline are connected in parallel between the outlet of the gas pressure source and one end of the main pipeline, the other end of the main pipeline is used to connect the to-be-tested object; the gas flow meter is connected on the main pipeline or the first branch pipeline, and the mixing container is connected on the second branch pipeline.

[0011] In the technical scheme, the outlet of the gas pressure source is selectively communicated with the first branch pipeline or the second branch pipeline, the gas flow meter is connected on the main pipeline or the first branch pipeline, and the mixing container is connected on the second branch pipeline, so that the gas pressure source can be selectively communicated with or not communicated with the mixing container. Therefore, when the to-be-tested object is not determined to be not in conformity with the standard, the gas of the gas pressure source can not pass through the mixing container, thereby reducing the risk that the flow characteristics of the gas of the gas pressure source are changed due to smoke particles in the smoke gas, thereby affecting the detection of the gas flow meter.

[0012] In some embodiments, the air tightness detection device further comprises a gas pressure sensor; the gas pressure sensor is connected on the main pipeline or the first branch pipeline.

[0013] In the technical scheme, the air tightness detection device further comprises a gas pressure sensor; the gas pressure sensor is connected on the main pipeline or the first branch pipeline, so that the gas pressure sensor and the gas flow meter are in a series connection relationship, and the gas pressure sensor can detect the gas pressure of the gas flowing through the gas flow meter, thereby facilitating the adjustment of the output gas pressure of the gas pressure source to adjust the gas pressure flowing through the gas flow meter within a stable range, thereby reducing the risk that the fluctuation of the gas pressure affects the flow of the gas flowing through the gas flow meter, and further improving the detection accuracy.

[0014] In some embodiments, the air tightness detection device further comprises a three-way valve; the three-way valve has a first port, a second port and a third port, the first port is connected with the outlet of the gas pressure source, the second port is connected with the first branch pipeline, and the third port is connected with the second branch pipeline.

[0015] In the technical scheme, the three-way valve is used to control the outlet of the gas pressure source to be selectively communicated with the first branch pipeline or the second branch pipeline, and the structure is simple and easy to realize.

[0016] In some embodiments, the air tightness detection device further comprises a first one-way valve; the first one-way valve is connected to the second branch pipeline; along the flow direction of the gas in the second branch pipeline, the first one-way valve is located downstream of the mixing container.

[0017] In the above technical solution, along the flow direction of the gas in the second branch pipeline, the first one-way valve is located downstream of the mixing container, that is, the gas can move towards the main pipeline through the first one-way valve, that is, the first one-way valve can limit the movement of the gas from the end where the second branch pipeline and the main pipeline are connected to the mixing container, so that when the gas pressure source is not connected to the mixing container, the first one-way valve can limit the movement of the gas from the end where the second branch pipeline and the main pipeline are connected to the mixing container, so that the gas pressure in the mixing container and the second branch pipeline is less than the gas pressure in the main pipeline, thereby reducing the risk that the smoke gas enters the main pipeline and affects the detection of the gas flow meter due to the fact that the gas pressure in the mixing container and the second branch pipeline is consistent with the gas pressure in the main pipeline, thereby further improving the accuracy of the detection.

[0018] In some embodiments, the gas flow meter is connected to the first branch pipeline, and the gas pressure sensor is connected to the first branch pipeline; the air tightness detection device further comprises a second one-way valve; the second one-way valve is connected to the first branch pipeline; along the flow direction of the gas in the first branch pipeline, the second one-way valve is located downstream of the gas flow meter and the gas pressure sensor.

[0019] In the above technical solution, along the flow direction of the gas in the first branch pipeline, the second one-way valve is located downstream of the gas flow meter and the gas pressure sensor, that is, the gas can move towards the main pipeline through the second one-way valve, that is, the second one-way valve can limit the movement of the gas from the end where the first branch pipeline and the main pipeline are connected to the gas flow meter and the gas pressure sensor, so that when the gas pressure source is connected to the mixing container, the second one-way valve can limit the movement of the gas from the end where the first branch pipeline and the main pipeline are connected to the gas flow meter and the gas pressure sensor, thereby reducing the risk that the performance of the sensor is reduced due to the fact that the smoke particles in the smoke gas adhere to the surface of the sensor of the gas flow meter, thereby affecting the accuracy of the flow measurement, thereby further improving the accuracy of the detection.

[0020] In some embodiments, the air tightness detection device further comprises a gas pressure sensor; the gas pressure sensor is connected to the pipeline.

[0021] In the technical solution, the gas pressure sensor is connected to the pipeline, so that the operator can detect the gas pressure in the pipeline through the gas pressure sensor, and then the output gas pressure of the gas pressure source can be adjusted to adjust the gas pressure in the pipeline within a stable range, thereby reducing the risk that fluctuation of the gas pressure affects the flow of the gas in the pipeline, and improving the detection accuracy.

[0022] In some embodiments, the gas pressure sensor is located upstream of the gas flow meter along a flow direction of the gas in the pipeline.

[0023] In the technical solution, the gas pressure sensor is located upstream of the gas flow meter along a flow direction of the gas in the pipeline, so that the gas pressure sensor and the gas flow meter are in series, and the gas pressure sensor can detect the gas pressure of the gas flowing through the gas flow meter, and then the output gas pressure of the gas pressure source can be adjusted to adjust the gas pressure flowing through the gas flow meter within a stable range, thereby reducing the risk that fluctuation of the gas pressure affects the flow of the gas flowing through the gas flow meter, and further improving the detection accuracy.

[0024] In some embodiments, the gas tightness detection device further comprises a quick connector; the quick connector is arranged at one end of the pipeline and used to connect the pipeline and the to-be-detected member.

[0025] In the technical solution, the quick connector is arranged to enable the pipeline to be detachably connected to the to-be-detected member, and to facilitate internal communication and isolation of the pipeline and the to-be-detected member, and the structure is simple and easy to implement. BRIEF DESCRIPTION OF DRAWINGS

[0026] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0027] Figure 1 The structure schematic diagram of a first gas tightness detection device provided by some embodiments of the present application;

[0028] Figure 2 The structure schematic diagram of a second gas tightness detection device provided by some embodiments of the present application;

[0029] Figure 3 The structure schematic diagram of a third gas tightness detection device provided by some embodiments of the present application;

[0030] Figure 4 The structure schematic diagram of a fourth gas tightness detection device provided by some embodiments of the present application;

[0031] Figure 5 A structure diagram of a fifth air tightness detection device provided for some embodiments of the present application is shown in FIG. 6;

[0032] Figure 6 A structure diagram of a sixth air tightness detection device provided for some embodiments of the present application is shown in FIG. 7; Figure 5 An enlarged view of A in FIG. 6;

[0033] Figure 7 A structure diagram of a seventh air tightness detection device provided for some embodiments of the present application is shown in FIG. 8.

[0034] Figure 8 A structure diagram of a seventh air tightness detection device provided for some embodiments of the present application is shown in FIG. 8.

[0035] Icon: 100-air tightness detection device;

[0036] 10-air pressure source; 20-pipeline; 21-main pipeline; 22-first branch pipeline; 23-second branch pipeline; 24-third branch pipeline; 25-fourth branch pipeline; 30-gas flow meter; 31-second one-way valve; 40-air pressure sensor; 50-smoke generator; 51-mixing container; 52-first one-way valve; 60-three-way valve; 70-quick connector;

[0037] 200-pieces to be detected; 2001-battery device. DETAILED DESCRIPTION

[0038] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover not exclusive inclusion. The terms “first”, “second” and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0040] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0041] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0042] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0043] In the embodiments of the application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0044] "Multiple" appearing in this application means more than two (including two).

[0045] In the process of pipeline production and processing, many products need to be tested for air tightness to detect whether they meet the air tightness requirements. However, in the process of air tightness detection of the tested piece, in addition to considering the accuracy of the detection, the detection efficiency of the tested piece is also a problem that cannot be ignored.

[0046] A battery device is taken as an example, which comprises a plurality of battery cells and a plurality of thermal management components, and a smoke exhaust member. The battery cells are arranged at intervals along a first direction, and the thermal management components are arranged between adjacent two battery cells and used for adjusting the temperature of the battery cells. The smoke exhaust member comprises a shell and an end cover. The shell has an opening in a second direction, and the end cover covers the opening to form a smoke exhaust passage in the smoke exhaust member. One side of the battery cell in the second direction has a pressure relief mechanism. The pressure relief mechanism can be in the form of an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure relief valve or a safety valve. The end cover has a smoke exhaust hole in the second direction and facing the side of the battery cell, which communicates with the smoke exhaust passage and corresponds to the pressure relief mechanism of the plurality of battery cells one by one. The first direction is perpendicular to the second direction.

[0047] When the battery cell is in thermal runaway, the pressure relief mechanism is actuated or the weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or passage for the internal pressure or temperature to be released. The high-temperature and high-pressure substances in the battery cell will be discharged outward from the actuated part as exhaust and enter the smoke exhaust passage through the smoke exhaust hole to be guided out of the battery device, thereby reducing the heat of the exhaust and the risk of thermal failure spreading between the plurality of battery cells.

[0048] However, in the second direction, the end of the battery cell close to the smoke exhaust member protrudes from the end of the thermal management component close to the smoke exhaust member, so that the end cover located between the adjacent battery cells has no support of the battery cell, and thus a gap is easily formed between the end cover and the shell at this part, thereby having a risk of exhaust leakage. Therefore, the smoke exhaust passage of the battery device needs to be subjected to air tightness detection. At present, the air tightness of the product is detected by differential pressure method, that is, a certain pressure of gas is added into the smoke exhaust passage through the gas outlet of the smoke exhaust passage, the gas outlet of the smoke exhaust passage is blocked, a certain time is waited, and then the pressure in the smoke exhaust passage is measured, and the air tightness of the smoke exhaust passage is determined by comparison with the pressure when the pressure is kept. Since a certain time is needed for detection, the flow line beat is slow and the efficiency is low.

[0049] In view of this, in order to reduce the waiting time of air tightness detection, speed up the flow line beat and improve the production efficiency, an air tightness detection device is provided in the embodiments of the present application, which comprises a gas pressure source, a pipeline and a gas flow meter. The gas pressure source is used for inflating the to-be-detected member. One end of the pipeline is connected to the gas pressure source, and the other end is used for connecting the to-be-detected member. The gas flow meter is connected to the pipeline.

[0050] In the air tightness detection device, the gas flow meter is connected to the pipeline. After the air pressure source completes the air charging in the to-be-tested member, the air pressure source is kept connected to the to-be-tested member, and the flow of the gas in the pipeline detected by the gas flow meter is observed and compared with the specified flow threshold value. If the flow is lower than the specified flow threshold value, the air tightness of the to-be-tested member meets the standard. If the flow is higher than the specified flow threshold value, the air tightness of the to-be-tested member does not meet the standard. Therefore, compared with the case of differential pressure detection, it is not necessary to detect the pressure in the to-be-tested member after the to-be-tested member is charged with a certain pressure of gas and is kept for a period of time to determine whether the air tightness of the to-be-tested member meets the standard, thereby reducing the air tightness detection waiting time, speeding up the line rhythm, and improving the production efficiency.

[0051] According to some embodiments of the present application, please refer to Figure 1 , Figure 1 A structure diagram of a first air tightness detection device 100 provided by some embodiments of the present application is shown. The embodiments of the present application provide an air tightness detection device 100, which includes an air pressure source 10, a pipeline 20, and a gas flow meter 30. The air pressure source 10 is used to charge air into a to-be-tested member 200. One end of the pipeline 20 is connected to the air pressure source 10, and the other end is used to connect the to-be-tested member 200. The gas flow meter 30 is connected to the pipeline 20.

[0052] The air pressure source 10 can be used to discharge gas with a certain pressure. For example, the air pressure source 10 can be a storage tank or a gas pipeline with a pressure pump.

[0053] In some embodiments, the air tightness detection device 100 can further include a control center, which can be in communication connection with the air pressure source 10, so as to control the air pressure source 10 to charge air into the to-be-tested member 200 through the pipeline 20 when the pipeline 20 is connected to the to-be-tested member 200, or to control the air pressure source 10 to stop charging air into the pipeline 20 when the pipeline 20 is not connected to the to-be-tested member 200.

[0054] The pipeline 20 is a pipeline connecting the air pressure source 10 and the to-be-tested member 200. For example, the pipeline 20 can be made of metal material or thermoplastic material with certain strength, so as to reduce the risk of deformation of the pipeline 20 when the air pressure source 10 charges air into the to-be-tested member 200 through the pipeline 20.

[0055] The gas flow meter 30 is an instrument for measuring the flow rate of gas. For example, the gas flow meter 30 can be a diaphragm type flow meter or a vortex type flow meter.

[0056] In some embodiments, please refer to Figure 1The pipeline 20 is two sections, two ends of one section of the two sections of the pipeline 20 are respectively communicated with the gas flow meter 30 and the to-be-tested member 200, and two ends of the other section of the pipeline 20 are respectively communicated with the gas flow meter 30 and the gas pressure source 10. Specifically, after the gas pressure source 10 completes the inflation of the to-be-tested member 200, the connection between the gas pressure source 10 and the to-be-tested member 200 is maintained, and the flow of the gas in the pipeline 20 detected by the gas flow meter 30 is observed and compared with the specified flow threshold value. If the flow is lower than the specified flow threshold value, the air tightness of the to-be-tested member 200 meets the standard. If the flow is higher than the specified flow threshold value, the air tightness of the to-be-tested member 200 does not meet the standard.

[0057] Exemplarily, the flow threshold value can be a point value of any one of 1.1 L / min, 1.2 L / min, 1.3 L / min, 1.4 L / min, 1.5 L / min, 1.6 L / min, 1.7 L / min, 1.8 L / min, 1.92 L / min or any numerical value between any two points.

[0058] In the embodiment, the gas flow meter 30 is connected to the pipeline 20. After the gas pressure source 10 completes the inflation of the to-be-tested member 200, the connection between the gas pressure source 10 and the to-be-tested member 200 is maintained, and the flow of the gas in the pipeline 20 detected by the gas flow meter 30 is observed and compared with the specified flow threshold value. If the flow is lower than the specified flow threshold value, the air tightness of the to-be-tested member 200 meets the standard. If the flow is higher than the specified flow threshold value, the air tightness of the to-be-tested member 200 does not meet the standard. Therefore, compared with the case of differential pressure method detection, it is not necessary to detect the pressure in the to-be-tested member 200 after a certain pressure of gas is introduced into the to-be-tested member 200 and the to-be-tested member 200 is left for a period of time to determine whether the air tightness of the to-be-tested member 200 meets the standard, thereby reducing the waiting time for air tightness detection, accelerating the line rhythm, and improving the production efficiency.

[0059] According to some embodiments of the present application, please refer to Figure 2 and Figure 3 , Figure 2 and Figure 3 are structural schematic diagrams of two air tightness detection devices 100 provided by some embodiments of the present application. The air tightness detection device 100 further comprises a smoke generator 50. The smoke generator 50 is used to provide smoke gas into the pipeline 20.

[0060] The smoke generator 50 is a device capable of generating smoke or fog. Exemplarily, the smoke generator 50 can be a heating type smoke generator 50 or a chemical reaction smoke generator 50.

[0061] In some embodiments, please refer to Figure 2The pipeline 20 includes a main pipeline 21, a first branch pipeline 22 and a second branch pipeline 23. The outlet of the gas pressure source 10 is in communication with the first branch pipeline 22 and the second branch pipeline 23. The first branch pipeline 22 and the second branch pipeline 23 are connected in parallel between the outlet of the gas pressure source 10 and one end of the main pipeline 21. The other end of the main pipeline 21 is used to connect the to-be-tested member 200. The gas flow meter 30 is connected to the first branch pipeline 22, and the smoke generator 50 is connected to the second branch pipeline 23.

[0062] In some embodiments, referring to Figure 3 The pipeline 20 includes a main pipeline 21. One end of the main pipeline 21 is in communication with the outlet of the gas pressure source 10. The other end of the main pipeline 21 is in communication with the inside of the to-be-tested member 200. The smoke generator 50 and the gas flow meter 30 are both connected to the main pipeline 21.

[0063] In some embodiments, the control center can be in communication connection with the smoke generator 50. When the control center receives a value of the flow of the gas in the pipeline 20 detected by the gas flow meter 30, which is greater than a flow threshold value, the control center can control the smoke generator 50 to provide smoke gas into the pipeline, so as to facilitate the positioning of the leakage point of the to-be-tested member 200 by the smoke gas.

[0064] In this embodiment, the smoke generator 50 is used to provide smoke gas into the pipeline 20, so that when the to-be-tested member 200 has a leakage point, the smoke gas can exit the to-be-tested member 200 from the leakage point, thereby facilitating the positioning of the leakage point and facilitating the subsequent repair of the to-be-tested member 200.

[0065] According to some embodiments of the present application, referring to Figure 2 and Figure 3 The airtightness detection device 100 further includes a mixing container 51. The mixing container 51 is connected to the pipeline 20, and the cavity of the mixing container 51 is in communication with the pipeline 20. The smoke generator 50 is connected to the mixing container 51, and the smoke generator 50 is used to provide smoke gas into the mixing container 51.

[0066] The mixing container 51 is a housing part of the airtightness detection device 100 for mixing the smoke gas and the gas of the gas pressure source 10.

[0067] In some embodiments, the smoke generator 50 is arranged on the outer circumferential side of the mixing container 51, and the smoke outlet of the smoke generator 50 is arranged in the cavity of the mixing container 51 to provide smoke gas into the inside of the mixing container 51. The mixing container 51 is respectively provided with a gas inlet at two ends for the gas in the pipeline 20 to enter the cavity and a gas outlet for the gas in the cavity to enter the pipeline 20.

[0068] In the embodiment, the cavity of the mixing container 51 is in communication with the pipeline 20, the smoke generator 50 is connected to the mixing container 51, and the smoke generator 50 is configured to provide smoke gas into the mixing container 51, so that the smoke gas can be uniformly mixed with the gas provided by the gas pressure source 10 in the mixing container 51, thereby reducing the risk that the gas from the leakage point of the to-be-tested member 200 out of the to-be-tested member 200 does not carry or only carries a small amount of smoke gas, resulting in that the leakage point is not found.

[0069] According to some embodiments of the present application, please refer to Figure 4 and Figure 5 , Figure 4 and Figure 5 are structural schematic diagrams of two gas tightness detection devices 100 provided by some embodiments of the present application. The pipeline 20 includes a main pipeline 21, a first branch pipeline 22, and a second branch pipeline 23. The outlet of the gas pressure source 10 is selectively in communication with the first branch pipeline 22 or the second branch pipeline 23, and the first branch pipeline 22 and the second branch pipeline 23 are connected in parallel between the outlet of the gas pressure source 10 and one end of the main pipeline 21, and the other end of the main pipeline 21 is configured to be connected to the to-be-tested member 200. The gas flow meter 30 is connected to the main pipeline 21 or the first branch pipeline 22, and the mixing container 51 is connected to the second branch pipeline 23.

[0070] The "outlet of the gas pressure source 10 is selectively in communication with the first branch pipeline 22 or the second branch pipeline 23" can be understood as that the gas pressure source 10 can be connected to one of the first branch pipeline 22 or the second branch pipeline 23 under the control of an operator.

[0071] In some embodiments, the outlet of the gas pressure source 10 is detachably connected to the first branch pipeline 22 and the second branch pipeline 23, and the outlet of the gas pressure source 10 is detachably connected to the first branch pipeline 22.

[0072] In some embodiments, a first valve is arranged on the first branch pipeline 22, and a second valve is arranged on the second branch pipeline 23, the first valve is configured to cut off or communicate the first branch pipeline 22 and the outlet of the gas pressure source 10, and the second valve is configured to cut off or communicate the second branch pipeline 23 and the outlet of the gas pressure source 10.

[0073] In some embodiments, please refer to Figure 4 , the gas flow meter 30 is connected to the first branch pipeline 22, and the mixing container 51 is connected to the second branch pipeline 23; in some embodiments, please refer to Figure 5 , the gas flow meter 30 is connected to the main pipeline 21, and the mixing container 51 is connected to the second branch pipeline 23.

[0074] In the embodiment, the outlet of the gas pressure source 10 is selectively communicated with the first branch pipe 22 or the second branch pipe 23, and the gas flow meter 30 is connected on the main pipe 21 or the first branch pipe 22, and the mixing container 51 is connected on the second branch pipe 23, so that the gas pressure source 10 is selectively communicated with or not communicated with the mixing container 51. Thus, when the object 200 is not determined to be out of standard, the gas of the gas pressure source 10 can not pass through the mixing container 51, so as to reduce the risk that the flow characteristics of the gas of the gas pressure source 10 are changed due to the smoke particles in the smoke gas, and then affect the detection of the gas flow meter 30.

[0075] According to some embodiments of the present application, please refer to Figure 4 and Figure 5 The air tightness detection device 100 further comprises a gas pressure sensor 40. The gas pressure sensor 40 is connected on the main pipe 21 or the first branch pipe 22.

[0076] In the embodiment, the air tightness detection device 100 further comprises a gas pressure sensor 40. The gas pressure sensor 40 is connected on the main pipe 21 or the first branch pipe 22, so that the gas pressure sensor 40 and the gas flow meter 30 are in series, and the gas pressure sensor 40 can detect the gas pressure of the gas flowing through the gas flow meter 30, so as to facilitate adjusting the output gas pressure of the gas pressure source 10 to adjust the gas pressure flowing through the gas flow meter 30 in a stable range, so as to reduce the risk that the fluctuation of the gas pressure affects the flow of the gas flowing through the gas flow meter 30, and further improve the detection accuracy.

[0077] According to some embodiments of the present application, the air tightness detection device 100 further comprises a three-way valve 60. The three-way valve 60 has a first port, a second port and a third port, the first port is connected with the outlet of the gas pressure source 10, the second port is connected with the first branch pipe 22, and the third port is connected with the second branch pipe 23.

[0078] The three-way valve 60 (also referred to as three-way valve 60 door) is a valve commonly used in pipe systems, which has three connection ports and can control the flow of fluid between three different pipes 20. Exemplarily, the three-way valve 60 can be a spherical three-way valve, a butterfly three-way valve or a gate three-way valve.

[0079] Specifically, the three-way valve 60 can selectively connect the first port with the second port or the third port, so as to selectively communicate the outlet of the gas pressure source 10 with the first branch pipe 22 or the second branch pipe 23.

[0080] In some embodiments, the three-way valve 60 is an electromagnetic three-way valve 60, and the control center can be communicatively connected with the three-way valve 60 to control the three-way valve 60 to make the first port and the second port communicate with each other when the pipeline 20 communicates with the to-be-tested member 200, so as to make the outlet of the control gas pressure source 10 communicate with the first branch pipeline 22, and then make the gas pressure source 10 inflate the to-be-tested member 200 through the first branch pipeline 22 and the main pipeline 21; and when the control center receives a value of the flow of the gas in the pipeline 20 detected by the gas flow meter 30, which is greater than a flow threshold value, the control center controls the three-way valve 60 to make the first port and the third port communicate with each other, so as to make the outlet of the control gas pressure source 10 communicate with the second branch pipeline 23, and then make the gas pressure source 10 inflate the to-be-tested member 200 through the second branch pipeline 23 and the main pipeline 21, so as to drive the smoke gas in the mixing container 51 to enter the to-be-tested member 200, thereby facilitating the positioning of the leakage point of the to-be-tested member 200 by the smoke gas.

[0081] In the embodiment, the outlet of the gas pressure source 10 is selectively communicated with the first branch pipeline 22 or the second branch pipeline 23 through the three-way valve 60, which is simple in structure and easy to implement.

[0082] According to some embodiments of the present application, please refer to Figure 4 The gas tightness detection device 100 further comprises a first one-way valve 52. The first one-way valve 52 is connected to the second branch pipeline 23. In the flow direction of the gas in the second branch pipeline 23, the first one-way valve 52 is located downstream of the mixing container 51.

[0083] The first one-way valve 52 is a valve that allows gas to flow in only one direction. Exemplarily, the first one-way valve 52 can be a spring return one-way valve, a ball valve type one-way valve, or a diaphragm type one-way valve.

[0084] In the embodiment, in the flow direction of the gas in the second branch pipeline 23, the first one-way valve 52 is located downstream of the mixing container 51, i.e., the gas can move towards the main pipeline 21 through the first one-way valve 52, i.e., the first one-way valve 52 can limit the movement of the gas from the end where the second branch pipeline 23 and the main pipeline 21 are connected to the mixing container 51, so that when the gas pressure source 10 does not communicate with the mixing container 51, the first one-way valve 52 can limit the movement of the gas from the end where the second branch pipeline 23 and the main pipeline 21 are connected to the mixing container 51, so that the gas pressure in the mixing container 51 and the second branch pipeline 23 is less than the gas pressure in the main pipeline, thereby reducing the risk of smoke gas entering the main pipeline and affecting the detection of the gas flow meter 30 when the gas pressure in the mixing container 51 and the second branch pipeline 23 is consistent with the gas pressure in the main pipeline, and further improving the accuracy of the detection.

[0085] According to some embodiments of the present application, please refer to Figure 4The gas flow meter 30 is connected to the first branch pipe 22, and the gas pressure sensor 40 is connected to the first branch pipe 22. The air tightness detection device 100 further comprises a second one-way valve 31. The second one-way valve 31 is connected to the first branch pipe 22. In the flow direction of the gas in the first branch pipe 22, the second one-way valve 31 is located downstream of the gas flow meter 30 and the gas pressure sensor 40.

[0086] The second one-way valve 31 is a valve that allows gas to flow in only one direction. Exemplarily, the second one-way valve 31 can be a spring return one-way valve, a ball valve one-way valve, or a diaphragm one-way valve.

[0087] In this embodiment, in the flow direction of the gas in the first branch pipe 22, the second one-way valve 31 is located downstream of the gas flow meter 30 and the gas pressure sensor 40, i.e. the gas can move towards the main pipe 21 through the second one-way valve 31, i.e. the second one-way valve 31 can limit the movement of the gas from the end of the first branch pipe 22 connected to the main pipe 21 towards the gas flow meter 30 and the gas pressure sensor 40, so that when the gas pressure source 10 is in communication with the mixing container 51, the second one-way valve 31 can limit the movement of the gas from the end of the first branch pipe 22 connected to the main pipe 21 towards the gas flow meter 30 and the gas pressure sensor 40, thereby reducing the risk of the smoke particles in the smoke gas adhering to the sensor surface of the gas flow meter 30, causing the sensor performance to decrease, thereby affecting the accuracy of the flow measurement, and further improving the accuracy of the detection.

[0088] According to some embodiments of the present application, please refer to Figure 7 and Figure 8 , Figure 7 and Figure 8 are structural schematic diagrams of two air tightness detection devices 100 provided by some embodiments of the present application. The air tightness detection device 100 further comprises a gas pressure sensor 40. The gas pressure sensor 40 is connected to the pipe 20.

[0089] The gas pressure sensor 40 is a device for measuring the pressure of the gas. Exemplarily, the gas pressure sensor 40 can be a strain sensor or a diaphragm sensor.

[0090] The "gas pressure sensor 40 is connected to the pipe 20" can be understood as that the gas pressure sensor 40 is in communication with the pipe 20, and exemplarily, the gas pressure sensor 40 is used to detect the pressure of the gas in the pipe 20.

[0091] In some embodiments, please refer to Figure 7The pipeline 20 includes a main pipeline 21, a third branch pipeline 24 and a fourth branch pipeline 25. The outlet of the gas pressure source 10 is communicated with the third branch pipeline 24 and the fourth branch pipeline 25. The third branch pipeline 24 and the fourth branch pipeline 25 are connected in parallel between the outlet of the gas pressure source 10 and one end of the main pipeline 21. The other end of the main pipeline 21 is used to connect the to-be-tested member 200. The gas flow meter 30 is connected to the third branch pipeline 24, and the gas pressure sensor 40 is connected to the fourth branch pipeline 25.

[0092] In some embodiments, referring to Figure 8 The pipeline 20 includes a main pipeline 21. One end of the main pipeline 21 is communicated with the outlet of the gas pressure source 10. The other end of the main pipeline 21 is communicated with the inside of the to-be-tested member 200. The gas pressure sensor 40 and the gas flow meter 30 are both connected to the main pipeline 21.

[0093] It can be understood that the gas pressure sensor 40 is connected to the pipeline 20, so that the operator can detect the gas pressure in the pipeline 20 through the gas pressure sensor 40, and then adjust the output gas pressure of the gas pressure source 10 to stabilize the gas pressure in the pipeline 20 within the working gas pressure range of the to-be-tested member 200, so as to better simulate the state of the to-be-tested member 200 when working, thereby improving the accuracy of detection.

[0094] For example, taking the exhaust member of the battery device 2001 as an example, the above working gas pressure can be any point value of 1.6Mpa, 1.65Mpa, 1.7Mpa, 1.75Mpa, 1.8Mpa, 1.85Mpa, 1.9Mpa, 1.95Mpa, 2Mpa, or a range value between any two points.

[0095] In some embodiments, the control center can be in communication connection with the gas pressure sensor 40, so that when the control center receives the detected pressure value of the gas pressure sensor 40, if the detected pressure value is not within the working gas pressure range, the control center controls the gas pressure source 10 to increase or decrease the pressure of the gas provided by the gas pressure source 10, so that the gas pressure in the pipeline 20 is within the working gas pressure range of the to-be-tested member 200, and the detected pressure value of the gas pressure sensor 40 is within the working gas pressure range of the to-be-tested member 200.

[0096] In this embodiment, the gas pressure sensor 40 is connected to the pipeline 20, so that the operator can detect the gas pressure in the pipeline 20 through the gas pressure sensor 40, and then adjust the output gas pressure of the gas pressure source 10 to stabilize the gas pressure in the pipeline 20 within a stable range, thereby reducing the risk that the fluctuation of the gas pressure affects the flow of the gas in the pipeline 20, thereby improving the accuracy of detection. At the same time, the gas pressure in the pipeline 20 is stabilized within the working gas pressure range of the to-be-tested member 200, so as to better simulate the state of the to-be-tested member 200 when working, thereby improving the accuracy of detection.

[0097] According to some embodiments of the present application, please refer to Figure 7 The gas pressure sensor 40 is located upstream of the gas flow meter 30 in the flow direction of the gas in the pipeline 20.

[0098] In the present embodiment, the gas pressure sensor 40 is located upstream of the gas flow meter 30 in the flow direction of the gas in the pipeline 20, so that the gas pressure sensor 40 and the gas flow meter 30 are in series, and the gas pressure sensor 40 can detect the gas pressure of the gas flowing through the gas flow meter 30, thereby facilitating the adjustment of the output gas pressure of the gas pressure source 10 to adjust the gas pressure flowing through the gas flow meter 30 within a stable range, thereby reducing the risk of fluctuations in the gas pressure affecting the flow of the gas flowing through the gas flow meter 30, and further improving the accuracy of the detection.

[0099] According to some embodiments of the present application, please refer to Figure 5 and Figure 6 , Figure 6 is an enlarged view of A in Figure 5 . The gas tightness detection device 100 further comprises a quick connector 70. The quick connector 70 is arranged at one end of the pipeline 20 for connecting the pipeline 20 and the to-be-tested member 200.

[0100] The quick connector 70 is a fitting for connecting and disconnecting pipelines. Exemplarily, the quick connector 70 can be a plug-in quick connector 70, a locking quick connector 70 or a quick plug connector.

[0101] In some embodiments, the quick connector 70 comprises a housing and a flexible sleeve. The housing has a receiving cavity in communication with one end of the main pipeline 21, and an opening is arranged on the side of the housing away from the main pipeline 21 and in communication with the receiving cavity. The flexible sleeve is located in the receiving cavity, and the outer peripheral side of the flexible sleeve is in interference fit with the receiving cavity, and the inner peripheral side of the flexible sleeve is configured to be in interference fit with the outer peripheral side of the to-be-tested member 200.

[0102] In the present embodiment, the arrangement of the quick connector 70 enables the pipeline 20 to be detachably connected with the to-be-tested member 200, and facilitates the internal communication and isolation of the pipeline 20 and the to-be-tested member 200, which is simple in structure and easy to implement.

[0103] According to some embodiments of the present application, please refer to Figure 5 and Figure 6 , the present embodiment provides a gas tightness detection device 100, comprising a gas pressure source 10, a pipeline 20 and a gas flow meter 30. The gas pressure source 10 is used to inflate the to-be-tested member 200. One end of the pipeline 20 is connected to the gas pressure source 10, and the other end is used to connect the to-be-tested member 200. The gas flow meter 30 is connected to the pipeline 20.

[0104] The airtightness detection device 100 further comprises a smoke generator 50 and a mixing container 51. The mixing container 51 is connected to the pipeline 20, and a cavity of the mixing container 51 is in communication with the pipeline 20. The smoke generator 50 is connected to the mixing container 51, and the smoke generator 50 is configured to provide smoke gas into the mixing container 51.

[0105] The pipeline 20 comprises a main pipeline 21, a first branch pipeline 22 and a second branch pipeline 23. The outlet of the air pressure source 10 is selectively in communication with the first branch pipeline 22 or the second branch pipeline 23. The first branch pipeline 22 and the second branch pipeline 23 are connected in parallel between the outlet of the air pressure source 10 and one end of the main pipeline 21. The other end of the main pipeline 21 is configured to be connected to the to-be-tested member 200. The gas flow meter 30 is connected to the main pipeline 21, and the mixing container 51 is connected to the second branch pipeline 23.

[0106] The airtightness detection device 100 further comprises an air pressure sensor 40. The air pressure sensor 40 is connected to the main pipeline 21 or the first branch pipeline 22. In the flow direction of the gas in the pipeline 20, the air pressure sensor 40 is located upstream of the gas flow meter 30. The airtightness detection device 100 further comprises a three-way valve 60. The three-way valve 60 has a first port, a second port and a third port. The first port is connected to the outlet of the air pressure source 10. The second port is connected to the first branch pipeline 22. The third port is connected to the second branch pipeline 23. The airtightness detection device 100 further comprises a quick connector 70. The quick connector 70 is arranged at one end of the pipeline 20, and is configured to connect the pipeline 20 and the to-be-tested member 200.

[0107] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0108] The above embodiments are only used to illustrate the technical solutions of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modified, equivalent replaced, improved and the like within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An airtightness testing device, characterized in that, include: A pressure source is used to pressurize the test piece with air. A pipeline, one end of which is connected to the air pressure source, and the other end of which is used to connect to the device under test; A gas flow meter is connected to the pipeline; A smoke generator is used to supply smoke gas into the pipeline.

2. The airtightness testing device as described in claim 1, characterized in that, The airtightness detection device also includes: A mixing container is connected to the pipeline, and the cavity of the mixing container is in communication with the pipeline; The smoke generator is connected to the mixing container and is used to supply smoke gas into the mixing container.

3. The airtightness testing device as described in claim 2, characterized in that, The pipeline includes a main pipeline, a first branch pipeline, and a second branch pipeline; The outlet of the pressure source is selectively connected to the first branch pipe or the second branch pipe. The first branch pipe and the second branch pipe are connected in parallel between the outlet of the pressure source and one end of the main pipe. The other end of the main pipe is used to connect the device under test. The gas flow meter is connected to the main pipeline or the first branch pipeline, and the mixing container is connected to the second branch pipeline.

4. The airtightness testing device as described in claim 3, characterized in that, The airtightness detection device also includes: A pressure sensor is connected to the main pipeline or the first branch pipeline.

5. The airtightness testing device as described in claim 4, characterized in that, The airtightness detection device also includes: The three-way valve has a first port, a second port and a third port, the first port being connected to the outlet of the air pressure source, the second port being connected to the first branch pipe, and the third port being connected to the second branch pipe.

6. The airtightness testing device as described in claim 5, characterized in that, The airtightness testing device also includes: The first check valve is connected to the second branch pipe; Along the flow direction of the gas in the second branch pipeline, the first check valve is located downstream of the mixing container.

7. The airtightness testing device as described in claim 5, characterized in that, The gas flow meter is connected to the first branch pipe, and the gas pressure sensor is connected to the first branch pipe; The airtightness detection device also includes: The second check valve is connected to the first branch pipe; Along the direction of gas flow in the first branch pipe, the second check valve is located downstream of the gas flow meter and the pressure sensor.

8. The airtightness testing device as described in claim 1, characterized in that, The airtightness testing device also includes: A pressure sensor is connected to the pipeline.

9. The airtightness testing device as described in claim 8, characterized in that, Along the direction of gas flow in the pipeline, the pressure sensor is located upstream of the gas flow meter.

10. The airtightness testing device according to any one of claims 1-9, characterized in that, The airtightness detection device also includes: A quick connector is located at one end of the pipeline and is used to connect the pipeline and the device under test.

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