Flow type air tightness detection device

Abstract

The utility model provides a flow type air tightness detection device which comprises a valve plate, an air inlet valve, an air outlet valve, a differential pressure sensor and a laminar flow pipe. The valve plate is provided with an air inlet channel, a first air conveying channel and a second air conveying channel, and the air inlet valve is connected with the air inlet channel, the first air conveying channel and the second air conveying channel and used for controlling connection and disconnection of the air inlet channel, the first air conveying channel and the second air conveying channel. The exhaust valve is connected with the first gas transmission channel and the second gas transmission channel and used for controlling connection and disconnection between the first gas transmission channel and the outside and between the second gas transmission channel and the outside. The pressure difference sensor is connected to the first gas transmission channel and the second gas transmission channel and is used for detecting the pressure difference between the test cavity and the standard cavity; the two ends of the laminar flow pipe are connected to the first air conveying channel and the second air conveying channel respectively, when the pressure difference exists between the test cavity and the standard cavity, air in the standard cavity slowly flows towards the test cavity, the situation that a test product is slightly damaged and cannot be detected can be avoided, and the detection accuracy of the battery pack is improved.

Description

Flow-type airtightness testing device Technical Field

[0001] This utility model relates to the technical field of airtightness testing equipment, specifically a flow-type airtightness testing device. Background Technology

[0002] A sealing tester, also known as an airtightness tester, is mainly used for sealing tests of packaging bags, bottles, tubes, cans, boxes, battery packs, etc. in industries such as food, pharmaceuticals, medical devices, daily chemicals, automobiles, electronic components, stationery, and consumer electronics, to prevent damage and air leakage.

[0003] In recent years, energy issues have become a global concern, and developing new energy sources has become an inevitable trend in the automotive industry. As the power source for automobiles, the power battery has become a key focus in the new energy vehicle industry, and the sealing performance of new energy vehicle battery packs has also become a crucial point of focus. The sealing and waterproof performance of new energy battery packs need to reach a certain level. Currently, when conducting airtightness testing on battery packs, it is usually necessary to place the test battery pack and a standard battery pack (a physical, leak-proof model battery pack can be used) into the test chamber and standard chamber, respectively. After injecting compressed gas and allowing it to stand still, the pressure difference sensor is observed to see if a pressure difference value appears. This testing method has high accuracy and relatively good test results.

[0004] However, when the battery pack being tested has extremely minor damage, the rate at which air enters the battery pack from the test chamber is very slow, and the differential pressure sensor may fail to detect it for a short period of time, thus compromising the accuracy of the test. Therefore, designing a device that can accurately detect the airtightness of the battery pack has become an urgent problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a flow-type airtightness detection device that can accurately detect the airtightness of a battery pack.

[0006] The technical solution of this utility model is to provide a flow-type airtightness detection device with the following structure:

[0007] The system includes a valve plate and an intake valve, an exhaust valve, a differential pressure sensor, and a laminar flow tube mounted on the valve plate. The valve plate has an intake channel, a first air delivery channel, and a second air delivery channel. One end of the intake channel penetrates one side wall of the valve plate for connection to an external air source. One end of the first and second air delivery channels penetrates the other side wall of the valve plate, respectively for connection to a test chamber and a standard chamber. The intake valve is connected to the intake channel, the first air delivery channel, and the second air delivery channel to control the opening and closing of these channels. The exhaust valve is connected to the first and second air delivery channels to control the opening and closing of these channels to the outside environment. The differential pressure sensor is connected to the first and second air delivery channels to detect the pressure difference between the test chamber and the standard chamber. The laminar flow tube is connected at both ends to the first and second air delivery channels to connect the test chamber and the standard chamber. When a pressure difference exists between the test chamber and the standard chamber, air from the standard chamber slowly flows into the test chamber through the laminar flow tube.

[0008] With the above structure, the flow-type airtightness testing device of this invention has the following advantages compared with the prior art:

[0009] During testing, this invention allows the test product to be placed in the test chamber and the standard product in the standard chamber. The air inlet valve connects the air inlet channel to the first and second air delivery channels, inflating both chambers. After inflation, the air inlet valve disconnects the air inlet channel from the first and second air delivery channels. Once the chamber is stationary, the differential pressure sensor is observed to detect any pressure difference. If the tested battery pack exhibits even minor damage, a pressure difference will occur between the test chamber and the standard chamber. At this point, air in the standard chamber will slowly flow into the test chamber through the laminar flow tube. Under the influence of this airflow, the differential pressure sensor can accurately detect this difference, allowing users to easily determine whether the battery pack's airtightness is acceptable.

[0010] This invention incorporates a laminar flow tube on the valve plate, which can prevent the failure to detect minor damage to the tested product and improve the accuracy of battery pack testing.

[0011] Preferably, the laminar flow tube includes a bent section and two vertical sections connected to both ends of the bent section, with the free ends of the two vertical sections respectively connected to the first gas delivery channel and the second gas delivery channel.

[0012] Preferably, a protective cover is attached to the valve plate to cover the laminar flow tube. Since the laminar flow tube is relatively thin, the protective cover can protect it and prevent blockage due to bending.

[0013] Preferably, the valve plate is provided with a first through hole, a second through hole and a third through hole, one end of the first through hole, the second through hole and the third through hole are respectively connected to the air intake channel, the first air supply channel and the second air supply channel, and the other end is connected to the air intake valve.

[0014] Preferably, the intake valve includes a valve body, a piston plate, a sealing connector, and a sealing gasket. The valve body has an upper valve chamber and a lower valve chamber arranged coaxially and communicating with each other from top to bottom. The valve body has a first intake port and a second intake port, which communicate with the top and bottom of the upper valve chamber, respectively. The piston plate is slidably connected to the upper valve chamber, and its outer peripheral wall is sealed to the inner wall of the upper valve chamber. The sealing connector is slidably connected to the lower valve chamber, and its outer peripheral wall is sealed to the inner wall of the lower valve chamber. The upper end of the sealing connector extends into the upper valve chamber and connects to the bottom of the piston plate, while its lower end connects to the sealing gasket. The first through hole, the second through hole, and the third through hole are located at the lower end of the lower valve chamber. The sealing gasket moves up and down with the piston plate, thereby separating from or abutting against the second and third through holes, thus opening or closing them.

[0015] Air is introduced into the valve chamber through the first or second air inlet, creating a pressure difference between the upper and lower parts of the piston plate. This drives the piston plate to move up and down, which in turn drives the sealing gasket to move up and down through the sealing connector, causing the sealing gasket to fit or separate from the second and third through holes. When the sealing gasket fits with the second and third through holes, the connection between the air intake channel and the first and second air delivery channels is broken. When the sealing gasket separates from the second and third through holes, the air intake channel connects with the first and second air delivery channels.

[0016] The original air path was controlled by a solenoid valve. However, after prolonged use, the solenoid valve tends to overheat, affecting the stability of the airflow and consequently the accuracy of the detection. Therefore, the air inlet valve was designed with the above structure to keep the drive part (i.e., the piston plate) away from the sealing gasket, thereby reducing the impact of temperature on the detection accuracy.

[0017] Preferably, a limiting hole is provided on the inner top wall of the upper valve chamber, and a limiting rod is provided on the top of the piston plate at a position corresponding to the limiting hole. The free end of the limiting rod slides axially and is circumferentially limited within the limiting hole. This can prevent circumferential rotation when the sealing gasket moves up and down, thereby avoiding misalignment of the sealing gasket with the second and third through holes, which could lead to poor sealing.

[0018] Preferably, both the piston plate and the sealing connector have at least one sealing ring on their outer peripheral walls to improve their sealing performance.

[0019] Preferably, the valve plate is provided with a fourth through hole, a fifth through hole and a sixth through hole, one end of the fourth through hole, the fifth through hole and the sixth through hole are respectively connected to the outside, the first air supply channel and the second air supply channel, and the other end is connected to the exhaust valve; the exhaust valve has the same structure as the intake valve.

[0020] Preferably, the valve plate is provided with a seventh through hole and an eighth through hole, one end of which is connected to the first gas delivery channel and the second gas delivery channel, respectively, and the other end is connected to the differential pressure sensor.

[0021] Preferably, the valve plate is also provided with a ninth through hole that communicates with the first air supply channel, and the other end of the ninth through hole is connected to a pressure sensor. The pressure sensor can also directly detect whether the pressure value of the test chamber changes, providing users with more detection methods to choose from. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the structure of this utility model.

[0023] Figure 2 is a schematic diagram of the valve plate and laminar flow tube in this utility model.

[0024] Figure 3 is a cross-sectional view of the valve plate in this utility model.

[0025] Figure 4 is a half-sectional view of the intake valve in this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Valve plate; 11. Inlet passage; 111. First through hole; 12. First air supply passage; 121. Second through hole; 122. Fifth through hole; 123. Seventh through hole; 124. Ninth through hole; 13. Second air supply passage; 131. Third through hole; 132. Sixth through hole; 133. Eighth through hole; 14. Fourth through hole; 2. Inlet valve; 21. Valve body; 211. Upper valve chamber; 212. Lower valve chamber; 213. First air inlet hole; 214. Second air inlet hole; 215. Limiting hole; 22. Piston plate; 221. Limiting rod; 23. Sealing connector; 24. Sealing gasket; 25. Sealing ring; 3. Exhaust valve; 4. Differential pressure sensor; 5. Laminar flow tube; 6. Protective cover; 7. Pressure sensor. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. At the same time, the terms "first", "second", etc., are only used to distinguish the names of various components and do not have a primary or secondary relationship. Therefore, they should not be construed as limitations on this utility model.

[0030] As shown in Figures 1, 2, 3 and 4, this utility model discloses a flow-type air tightness detection device, which includes a valve plate 1 and an inlet valve 2, an exhaust valve 3, a differential pressure sensor 4 and a laminar flow pipe 5 disposed on the valve plate 1.

[0031] The valve plate 1 is provided with an air inlet channel 11, a first air delivery channel 12 and a second air delivery channel 13. One end of the air inlet channel 11 passes through one side wall of the valve plate 1 and is used to connect to an external air source. One end of the first air delivery channel 12 and the second air delivery channel 13 passes through the other side wall of the valve plate 1 and are used to connect to the test chamber and the standard chamber, respectively.

[0032] The intake valve 2 is connected to the intake channel 11, the first air supply channel 12, and the second air supply channel 13, and is used to control the opening and closing of the intake channel 11 and the first air supply channel 12 and the second air supply channel 13; the exhaust valve 3 is connected to the first air supply channel 12 and the second air supply channel 13, and is used to control the opening and closing of the first air supply channel 12 and the second air supply channel 13 with the outside; the differential pressure sensor 4 is connected to the first air supply channel 12 and the second air supply channel 13, and is used to detect the pressure difference between the test chamber and the standard chamber; the two ends of the laminar flow pipe 5 are respectively connected to the first air supply channel 12 and the second air supply channel 13, and are used to connect the test chamber and the standard chamber. When there is a pressure difference between the test chamber and the standard chamber, the air in the standard chamber flows slowly into the test chamber through the laminar flow pipe 5.

[0033] In this invention, during testing, the test product is placed in the test chamber, and the standard product is placed in the standard chamber. Then, the air inlet valve 2 controls the air inlet channel 11 to connect with the first air delivery channel 12 and the second air delivery channel 13, inflating the test chamber and the standard chamber. After inflation, the air inlet valve disconnects the air inlet channel 11 from the first air delivery channel 12 and the second air delivery channel 13. After the chamber comes to rest, the differential pressure sensor 4 is observed to detect any pressure difference. If the tested battery pack has extremely minor damage, a pressure difference will appear between the test chamber and the standard chamber. At this time, the air in the standard chamber will slowly flow into the test chamber through the laminar flow tube 5. Under the influence of the airflow, the differential pressure sensor 4 can accurately detect this, thus facilitating the user's judgment on whether the battery pack's airtightness is up to standard. This invention, by setting the laminar flow tube 5 on the valve plate 1, can avoid the situation where minor damage to the test product goes undetected, improving the accuracy of battery pack testing. The aforementioned differential pressure sensor 4 is prior art and will not be described in detail here.

[0034] The laminar flow tube 5 includes a bent section and two vertical sections connected to both ends of the bent section. The free ends of the two vertical sections are respectively connected to the first air supply channel 12 and the second air supply channel 13. The bent section can be set in a spiral shape, which can extend the length of the laminar flow tube 5 and make the air flow slower.

[0035] Since the laminar flow tube 5 is relatively thin and easily bent, a protective cover 6 is connected to the valve plate 1 and placed over the laminar flow tube 5 to protect it and prevent it from becoming blocked due to bending.

[0036] The valve plate 1 is provided with a first through hole 111, a second through hole 121, and a third through hole 131. One end of the first through hole 111, the second through hole 121, and the third through hole 131 are respectively connected to the intake channel 11, the first air supply channel 12, and the second air supply channel 13, and the other end is connected to the intake valve 2. The valve plate 1 is also provided with a fourth through hole 14, a fifth through hole 122, and a sixth through hole 132. One end of the fourth through hole 14, the fifth through hole 122, and the sixth through hole 132 are respectively connected to the outside, the first air supply channel 12, and the second air supply channel 13, and the other end is connected to the exhaust valve 3.

[0037] The intake valve 2 includes a valve body 21, a piston plate 22, a sealing connector 23, and a sealing gasket 24. The valve body 21 has an upper valve chamber 211 and a lower valve chamber 212 arranged coaxially and communicating with each other from top to bottom. The valve body 21 has a first intake port 213 and a second intake port 214, which communicate with the top and bottom of the upper valve chamber 211, respectively. The piston plate 22 is slidably connected to the upper valve chamber 211, and the outer peripheral wall of the piston plate 22 is sealed to the inner wall of the upper valve chamber 211. The sealing connector 23 is slidably connected to the lower valve chamber 212. The sealing connector 23 is located inside the valve chamber 212, and its outer peripheral wall is sealed to the inner wall of the lower valve chamber 212. The upper end of the sealing connector 23 extends into the upper valve chamber 211 and is connected to the bottom of the piston plate 22. The lower end of the sealing connector 23 is connected to the sealing gasket 24. The first through hole 111, the second through hole 121 and the third through hole 131 are located at the lower end of the lower valve chamber 212. The sealing gasket 24 moves up and down with the piston plate 22, thereby separating from or abutting against the second through hole 121 and the third through hole 131, thereby opening or closing the second through hole 121 and the third through hole 131.

[0038] Air is introduced into the upper valve chamber 211 through the first air inlet 213 or the second air inlet 214, creating a pressure difference between the upper and lower parts of the piston plate 22. This drives the piston plate 22 to move up and down, which in turn drives the sealing gasket 24 to move up and down through the sealing connector 23. This causes the sealing gasket 24 to fit or separate from the second through hole 121 and the third through hole 131. When the sealing gasket 24 fits with the second through hole 121 and the third through hole 131, the connection between the air intake channel 11 and the first air supply channel 12 and the second air supply channel 13 is broken. When the sealing gasket 24 separates from the second through hole 121 and the third through hole 131, the air intake channel 11 connects with the first air supply channel 12 and the second air supply channel 13.

[0039] Since the original air path was controlled by a solenoid valve, which tends to overheat after prolonged use, affecting the stability of the airflow and consequently the accuracy of the detection, the air intake valve 2 was designed with the above structure to keep the drive part away from the sealing gasket 24 and reduce the impact of temperature on the detection accuracy.

[0040] A limiting hole 215 is provided on the inner top wall of the upper valve chamber 211. A limiting rod 221 is provided on the top of the piston plate 22 at a position corresponding to the limiting hole 215. The free end of the limiting rod 221 slides axially and is circumferentially limited within the limiting hole 215. This can prevent circumferential rotation when the sealing gasket 24 moves up and down, thereby avoiding misalignment of the sealing gasket 24 with the second through hole 121 and the third through hole 131, which would lead to poor sealing.

[0041] At least one sealing ring 25 is provided on the outer peripheral wall of both the piston plate 22 and the sealing connector 23 to improve their sealing performance.

[0042] The exhaust valve 3 has the same structure as the intake valve 2. Its lower valve chamber is located above the fourth through hole 14, the fifth through hole 122 and the sixth through hole 132. After the test is completed, the exhaust valve 3 releases air to the outside through the fourth through hole 14.

[0043] The valve plate 1 is provided with a seventh through hole 123 and an eighth through hole 133. One end of the seventh through hole 123 and the eighth through hole 133 are respectively connected to the first gas supply channel 12 and the second gas supply channel 13, and the other end is connected to the differential pressure sensor 4.

[0044] The valve plate 1 is also provided with a ninth through hole 124 that is connected to the first gas supply channel 12. The other end of the ninth through hole 124 is connected to a pressure sensor 7, which can directly detect whether the pressure value of the test chamber changes, providing more detection methods for users to choose from.

[0045] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A flow-type airtightness testing device, characterized in that: The system includes a valve plate (1) and an intake valve (2), an exhaust valve (3), a differential pressure sensor (4), and a laminar flow tube (5) mounted on the valve plate (1). The valve plate (1) is provided with an intake channel (11), a first gas delivery channel (12), and a second gas delivery channel (13). One end of the intake channel (11) penetrates one side wall of the valve plate (1) for connecting to an external gas source. One end of the first gas delivery channel (12) and the second gas delivery channel (13) penetrates the other side wall of the valve plate (1) for connecting to the test chamber and the standard chamber, respectively. The intake valve (2) is connected to the intake channel (11), the first gas delivery channel (12), and the second gas delivery channel (13) for controlling the connection between the intake channel (11) and the first gas delivery channel (12). The opening and closing of the first gas supply channel (12) and the second gas supply channel (13); the exhaust valve (3) is connected to the first gas supply channel (12) and the second gas supply channel (13) to control the opening and closing of the first gas supply channel (12) and the second gas supply channel (13) with the outside world; the differential pressure sensor (4) is connected to the first gas supply channel (12) and the second gas supply channel (13) to detect the pressure difference between the test chamber and the standard chamber; the two ends of the laminar flow tube (5) are respectively connected to the first gas supply channel (12) and the second gas supply channel (13) to connect the test chamber and the standard chamber. When there is a pressure difference between the test chamber and the standard chamber, the air in the standard chamber flows slowly to the test chamber through the laminar flow tube (5).

2. The flow-type airtightness detection device according to claim 1, characterized in that: The laminar flow tube (5) includes a bent section and two vertical sections connected to both ends of the bent section. The free ends of the two vertical sections are respectively connected to the first gas delivery channel (12) and the second gas delivery channel (13).

3. The flow-type airtightness detection device according to claim 2, characterized in that: A protective cover (6) is connected to the valve plate (1) for covering the laminar flow pipe (5).

4. The flow-type airtightness detection device according to claim 1, characterized in that: The valve plate (1) is provided with a first through hole (111), a second through hole (121) and a third through hole (131). One end of the first through hole (111), the second through hole (121) and the third through hole (131) are respectively connected to the air intake channel (11), the first air supply channel (12) and the second air supply channel (13), and the other end is connected to the air intake valve (2).

5. The flow-type airtightness testing device according to claim 4, characterized in that: The intake valve (2) includes a valve body (21), a piston plate (22), a sealing connector (23), and a sealing gasket (24). The valve body (21) has an upper valve chamber (211) and a lower valve chamber (212) arranged coaxially and communicating with each other from top to bottom. The valve body (21) has a first intake hole (213) and a second intake hole (214), which communicate with the top and bottom of the upper valve chamber (211), respectively. The piston plate (22) is slidably connected within the upper valve chamber (211), and the outer peripheral wall of the piston plate (22) is sealed to the inner wall of the upper valve chamber (211). The sealing connector (23) is slidably connected to... Inside the lower valve chamber (212), the outer peripheral wall of the sealing connector (23) is sealed to the inner wall of the lower valve chamber (212); the upper end of the sealing connector (23) extends into the upper valve chamber (211) and is connected to the bottom of the piston plate (22); the lower end of the sealing connector (23) is connected to the sealing gasket (24); the first through hole (111), the second through hole (121) and the third through hole (131) are located at the lower end of the lower valve chamber (212); the sealing gasket (24) moves up and down with the piston plate (22), thereby separating from or abutting against the second through hole (121) and the third through hole (131), thereby opening or closing the second through hole (121) and the third through hole (131).

6. The flow gas tightness testing device of claim 5, wherein: The upper valve chamber (211) has a limiting hole (215) on its inner top wall. The piston plate (22) has a limiting rod (221) at the position corresponding to the limiting hole (215) on its top. The free end of the limiting rod (221) slides axially and is circumferentially limited in the limiting hole (215).

7. The flow gas tightness testing device of claim 5, wherein: At least one sealing ring (25) is provided on the outer peripheral wall of both the piston plate (22) and the sealing connector (23) to improve their sealing performance.

8. The flow-type airtightness testing device according to claim 5, characterized in that: The valve plate (1) is provided with a fourth through hole (14), a fifth through hole (122) and a sixth through hole (132). One end of the fourth through hole (14), the fifth through hole (122) and the sixth through hole (132) are connected to the outside, the first gas supply channel (12) and the second gas supply channel (13) respectively, and the other end is connected to the exhaust valve (3). The exhaust valve (3) has the same structure as the intake valve (2).

9. The flow-type airtightness detection device according to claim 1, characterized in that: The valve plate (1) is provided with a seventh through hole (123) and an eighth through hole (133). One end of the seventh through hole (123) and the eighth through hole (133) are connected to the first gas supply channel (12) and the second gas supply channel (13), respectively, and the other end is connected to the differential pressure sensor (4).

10. The flow-type airtightness detection device according to claim 1, characterized in that: The valve plate (1) is also provided with a ninth through hole (124) that is connected to the first gas transmission channel (12), and the other end of the ninth through hole (124) is connected to a pressure sensor (7).

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