A device for detecting air leakage in finished products based on displacement changes

Abstract

This utility model belongs to the field of detection technology, and particularly relates to a device for detecting leaks in finished products based on displacement changes. It includes a mounting plate, a cylinder, a controller, a buzzer, a distance sensor, a spring, and a piston plate. The cylinder is fixed to the geometric center of the mounting plate. The controller and buzzer are vertically mounted on the front of the cylinder. The distance sensor is mounted on the upper part of the cylinder with its sensing surface facing downwards. Both the distance sensor and the buzzer are electrically connected to the controller. The piston plate is slidably disposed inside the cylinder. This utility model, by incorporating a cylinder, controller, buzzer, distance sensor, spring, piston plate, inflation bladder, and one-way valve, achieves automatic pressurization, real-time monitoring, and leak alarm. It overcomes the problems of water immersion detection not being applicable to the entire machine, pressure gauges relying on manual readings, and fixed sensor systems being costly and having poor environmental adaptability. It has the advantages of moderate cost, simple operation, and timely response.

Description

Technical Field

[0001] This utility model belongs to the field of detection technology, and in particular relates to a device for detecting air leakage in finished products based on displacement changes. Background Technology

[0002] With the development of industrial technology, many devices require good airtightness during use, such as battery test cabinets and power battery packs in the new energy field, as well as vacuum equipment, medical instruments, and pressure vessels. Leaks in these devices can lead to performance degradation, safety hazards, or even system failure; therefore, reliable airtightness testing is essential before use.

[0003] Currently, common leak detection methods mainly include manual immersion testing, pressure gauge monitoring, and fixed sensor testing. Among them, manual immersion testing, although low in cost and with intuitive results, requires immersing the tested equipment in water to observe bubbles, making it unsuitable for testing the sealing of the entire machine or assembled equipment. Pressure gauge testing can achieve pressurization and pressure holding, but it relies on manual periodic inspections and readings, making it impossible to achieve real-time continuous monitoring and difficult to detect minute leaks in a timely manner. While automatic detection systems using fixed sensors can achieve data acquisition and alarms, they are expensive overall, have poor resistance to electromagnetic interference and changes in environmental temperature and humidity, and have strict requirements for the operating environment, making it difficult to widely apply in small and medium-sized enterprises or at the end of ordinary production lines.

[0004] Therefore, there is a particular need for a device that detects leaks in finished products based on displacement changes, in order to solve the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of existing leak detection methods, such as inconvenience in operation, poor real-time performance, high cost, or weak environmental adaptability, this utility model provides a device for detecting leaks in finished products based on displacement changes.

[0006] This utility model is achieved through the following technical means: a device for detecting air leakage in finished products based on displacement changes, comprising a mounting plate, a cylinder, a controller, a buzzer, a distance sensor, a spring, a piston plate, a vent plate, an air outlet pipe, a threaded block, an inflatable bladder, and a one-way valve. The cylinder is fixed at the geometric center of the mounting plate. The controller and the buzzer are vertically distributed and installed at the front of the cylinder. The distance sensor is installed in the upper part of the cylinder with its sensing surface facing downward. Both the distance sensor and the buzzer are electrically connected to the controller. The piston plate is slidably disposed inside the cylinder, with the sensing surface of the distance sensor facing the piston plate. One end of the spring is fixed to the inner wall of the cylinder, and the other end is connected to the piston plate. The vent plate is fixed to the lower part of the cylinder. The air outlet pipe is fixed to one side of the lower part of the cylinder, and its air outlet end is threaded with a threaded block. The inflatable bladder is fixed to the other side of the lower part of the cylinder, and its air outlet end communicates with the inside of the cylinder. The one-way valve is disposed inside the air outlet end of the inflatable bladder.

[0007] In a preferred embodiment of this utility model, it further includes a motor, a rotating rod, a sliding block, a lifting plate, and a support plate. The motor is installed on one side of the middle part of the cylinder and is electrically connected to the controller. The rotating rod is fixed to the output shaft of the motor. The sliding block is rotatably disposed at one end of the rotating rod. The lifting plate is slidably disposed on one side of the lower part of the cylinder. The airbag is located below the lifting plate. The sliding block slides with the lifting plate through a reserved groove. The support plate is installed on one side of the top of the mounting plate, and the bottom of the airbag contacts the top of the support plate.

[0008] In a preferred embodiment of the present invention, a limiting block is further included. The limiting block is fixed to the lower part of the cylinder and is located below the piston plate and in contact with it.

[0009] In a preferred embodiment of this invention, the threaded block is made of sealing rubber.

[0010] In a preferred embodiment of this invention, the lifting plate completely obscures the body of the inflatable bladder from a top-down view.

[0011] In a preferred embodiment of this utility model, the motor is a DC geared motor.

[0012] Beneficial effects: 1. This utility model achieves automatic pressurization, real-time monitoring and leakage alarm by setting up a cylinder, controller, buzzer, distance sensor, spring, piston plate, air bladder and one-way valve. It overcomes the problems of water immersion detection not being applicable to the whole machine, pressure gauge relying on manual reading, and fixed sensor system having high cost and poor environmental adaptability. It has the advantages of moderate cost, simple operation and timely response.

[0013] 2. This utility model achieves automatic compression of the airbag and automatic pressurization of the cylinder through the linkage structure of the motor, rotating rod, sliding block and lifting plate, replacing manual operation, improving the stability of the pressurization process and achieving the practical effect of automated detection. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a partial sectional view of the mounting plate, cylinder, piston plate, air outlet pipe, and airbag components of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the mounting plate, cylinder, airbag, and support plate components of this utility model.

[0017] Figure 4 This is a three-dimensional structural diagram of the motor, rotating rod, sliding block, and lifting plate components of this utility model.

[0018] The attached diagram is labeled as follows: 1. Mounting plate, 2. Cylinder, 3. Controller, 4. Buzzer, 5. Distance sensor, 6. Spring, 7. Piston plate, 8. Limiting block, 9. Vent plate, 10. Air outlet pipe, 11. Threaded block, 12. Inflatable bladder, 13. One-way valve, 14. Motor, 15. Rotating rod, 16. Sliding block, 17. Lifting plate, 18. Support plate. Detailed Implementation

[0019] Example: A device for detecting leaks in finished products based on displacement changes, such as... Figures 1-3 As shown, the device includes a mounting plate 1, a cylinder 2, a controller 3, a buzzer 4, a distance sensor 5, a spring 6, a piston plate 7, a limiting block 8, a vent plate 9, an air outlet pipe 10, a threaded block 11, an inflation bladder 12, and a one-way valve 13. The cylinder 2 is fixedly connected to the geometric center of the mounting plate 1. The controller 3 and buzzer 4 are bolted perpendicularly to the front of the cylinder 2. The distance sensor 5 is bolted to the upper part of the cylinder 2, with its sensing surface facing downwards. Both the distance sensor 5 and the buzzer 4 are electrically connected to the controller 3. The piston plate 7 is slidably disposed inside the cylinder 2, with the sensing surface of the distance sensor 5 facing the piston plate 7. The upper end of the spring 6 is fixedly connected to the inner wall of the cylinder 2, and the lower end is connected to the piston plate 7, providing an elastic force for the piston plate 7 to return downwards. The limiting block 8 is fixedly connected to the lower part of the cylinder 2. The piston plate 7 is located below and in contact with the piston plate 7, thereby limiting the maximum downward stroke of the piston plate 7 inside the cylinder 2 and preventing the piston plate 7 from sliding to the height area where the air outlet pipe 10 and the air bladder 12 are located. The vent plate 9 is fixedly connected to the lower part of the cylinder 2. The air outlet pipe 10 is fixedly connected to the lower left side of the cylinder 2. The internal thread of its air outlet end is provided with a threaded block 11. The threaded block 11 is made of sealing rubber and has good sealing performance. By unscrewing the threaded block 11 to open the air outlet pipe 10, the gas inside the cylinder 2 can be discharged. The air bladder 12 is fixedly connected to the lower right side of the cylinder 2. Its air outlet end is connected to the inside of the cylinder 2. The one-way valve 13 is set inside the air outlet end of the air bladder 12 to ensure that the gas can only flow into the cylinder 2 from the air bladder 12 in one direction and prevent the gas inside the cylinder 2 from flowing back.

[0020] like Figures 1-4As shown, it also includes a motor 14, a rotating rod 15, a sliding block 16, a lifting plate 17, and a support plate 18. The motor 14 is bolted to the right side of the middle part of the cylinder 2. The motor 14 is electrically connected to the controller 3, and the motor 14 is a DC geared motor with stable and adjustable speed. The rotating rod 15 is fixedly connected to the output shaft of the motor 14. The sliding block 16 is rotatably disposed at the lower end of the rotating rod 15. The lifting plate 17 is slidably disposed on the lower right side of the cylinder 2. The airbag 12 is located below the lifting plate 17. The sliding block 16 slides with the lifting plate 17 through a pre-reserved groove. When the motor... When the rotating rod 15 rotates, the sliding block 16 drives the lifting plate 17 to move up and down reciprocally, thereby realizing automatic compression of the airbag 12 and completing continuous inflation. The lifting plate 17 completely covers the body of the airbag 12 from a top view, ensuring that the airbag 12 can be fully compressed during the downward pressing of the lifting plate 17. The support plate 18 is bolted to the top right side of the mounting plate 1, and the bottom of the airbag 12 contacts the top of the support plate 18. The support plate 18 provides bottom support and limit for the airbag 12, ensuring that it is stable under force during the downward pressing of the lifting plate 17.

[0021] When this device is needed, the operator first fixes the device to the finished product equipment whose air tightness is to be tested by mounting plate 1. At this time, the cylinder 2 is in a closed state, the piston plate 7 is located in a lower position inside the cylinder 2, and the spring 6 is in a naturally extended state.

[0022] Then, the automatic pressurization stage begins. The controller 3 issues an inflation command, and the motor 14 starts. Its output shaft drives the rotating rod 15 to rotate clockwise. The rotating rod 15 pushes the lifting plate 17 to move downward in the vertical direction through the sliding block 16, gradually squeezing the air bladder 12 located below it. During the squeezing process, the gas inside the air bladder 12 is compressed and flows into the cylinder 2 through the one-way valve 13. As the gas is continuously filled, the air pressure inside the cylinder 2 gradually increases, pushing the piston plate 7 to move upward against the elastic force of the spring 6. During this process, while the sliding block 16 drives the lifting plate 17 to move downward, it slides to the left along the reserved slide groove on the lifting plate 17. When the sliding block 16 slides to the leftmost end of the slide groove, the lifting plate 17 reaches the lower limit position, completing one squeezing action.

[0023] Then the output shaft of motor 14 reverses, driving the rotating rod 15 to rotate counterclockwise. The sliding block 16 then pulls the lifting plate 17 to move upward, escaping the pressure on the airbag 12. At the same time, the sliding block 16 slides to the right along the slide groove to reset. When the sliding block 16 slides to the rightmost end of the slide groove, the lifting plate 17 returns to the initial position, completing one inflation cycle. The controller 3 can control the motor 14 to repeat this reciprocating motion once or twice according to the set program to ensure that the cylinder 2 is filled with sufficient gas and establishes a stable pressure environment.

[0024] After pressurization is completed, controller 3 activates distance sensor 5 to detect the distance between it and piston plate 7 in real time, and sets the measured value at this time as the reference value as the reference standard for subsequent leakage judgment. The system then enters the pressure holding detection stage.

[0025] During the testing phase, if the tested equipment has good airtightness and no gas leakage, the pressure inside the cylinder 2 remains constant, the position of the piston plate 7 remains stable, the distance signal continuously monitored by the distance sensor 5 does not change significantly, the controller 3 determines it to be in normal condition, the buzzer 4 does not activate, and the system maintains monitoring.

[0026] If the tested equipment leaks, the gas inside the cylinder 2 leaks into the tested equipment through the vent plate 9, causing the air pressure acting on the piston plate 7 to decrease. At this time, the return force of the spring 6 takes effect, pushing the piston plate 7 to move downward. The distance sensor 5 captures the displacement change of the piston plate 7 in real time and transmits the signal to the controller 3. After the controller 3 determines that the displacement exceeds the allowable threshold, it immediately triggers the buzzer 4 to issue an audible and visual alarm to remind the operator that there is a leakage fault in the equipment.

[0027] After the alarm is triggered, the operator can issue the inflation command again through the controller 3 to restart the motor 14 for pressurization, push the piston plate 7 back to its original position, and the system continues to monitor, realizing the cyclic detection function. The whole process does not require frequent manual intervention, realizing full automation from pressurization, calibration, monitoring to alarm, improving detection efficiency and reliability.

Claims

1. A device for detecting leakage of a finished product based on displacement change, characterized by, The system includes a mounting plate (1), a cylinder (2), a controller (3), a buzzer (4), a distance sensor (5), a spring (6), a piston plate (7), a vent plate (9), an air outlet pipe (10), a threaded block (11), an inflation bladder (12), and a one-way valve (13). The cylinder (2) is fixed to the geometric center of the mounting plate (1). The controller (3) and the buzzer (4) are vertically distributed and installed at the front of the cylinder (2). The distance sensor (5) is installed inside the upper part of the cylinder (2), with its sensing surface facing downwards. Both the distance sensor (5) and the buzzer (4) are electrically connected to the controller (3). The piston plate (7) is slidably disposed inside the cylinder (2), the sensing surface of the distance sensor (5) faces the piston plate (7), one end of the spring (6) is fixed to the inner wall of the cylinder (2), and the other end is connected to the piston plate (7), the vent plate (9) is fixed to the lower part of the cylinder (2), the air outlet pipe (10) is fixed to one side of the lower part of the cylinder (2), and a threaded block (11) is provided inside the air outlet end, the air bladder (12) is fixed to the other side of the lower part of the cylinder (2), and its air outlet end is connected to the inside of the cylinder (2), and a one-way valve (13) is disposed inside the air outlet end of the air bladder (12).

2. A device for detecting leakage of a finished product based on displacement change according to claim 1, wherein It also includes a motor (14), a rotating rod (15), a sliding block (16), a lifting plate (17), and a support plate (18). The motor (14) is installed on one side of the middle part of the cylinder (2). The motor (14) is electrically connected to the controller (3). The rotating rod (15) is fixed on the output shaft of the motor (14). The sliding block (16) is rotatably set at one end of the rotating rod (15). The lifting plate (17) is slidably set on one side of the lower part of the cylinder (2). The airbag (12) is located below the lifting plate (17). The sliding block (16) slides with the lifting plate (17) through the reserved sliding groove. The support plate (18) is installed on one side of the top of the mounting plate (1). The bottom of the airbag (12) is in contact with the top of the support plate (18).

3. A device for detecting leakage of a finished product based on change in displacement according to claim 2, wherein It also includes a limiting block (8), which is fixed to the lower part of the cylinder (2) and located below and in contact with the piston plate (7).

4. The device for detecting leakage of finished product based on displacement change according to claim 3, characterized in that, The threaded block (11) is made of sealing rubber.

5. The device for detecting air leakage in a finished product based on displacement change according to claim 4, characterized in that, The lifting plate (17) completely obscures the body of the inflatable bladder (12) from a top-down view.

6. A device for detecting leakage of a finished product based on change in displacement according to claim 5, wherein The motor (14) is a DC geared motor.

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