Pressure-adjustable air leakage detection device and detection method

Abstract

The invention discloses a pressure-adjustable air leakage detection device which comprises a sealed cabin, a booster fan connected with the cabin through an air supply pipeline, an exhaust pipeline and a pressure measurement module, the exhaust pipeline and the pressure measurement module are connected to the sealed cabin, and a first gas flow meter and a second gas flow meter are installed on the air supply pipeline and the exhaust pipeline respectively. A heat exchange cylinder is installed in the sealed cabin, and the bottom of the sealed cabin is connected with a drainage pipe. The effects of improving the accuracy of product air leakage detection under different pressures and avoiding the influence of moist air on the tested product in the test process are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of air leakage detection, in particular to a pressure-adjustable air leakage detection device and a detection method. Background Art

[0002] Leakage refers to the amount of air that leaks out through the gaps in a product under a certain pressure. Most existing methods for detecting leakage are to compress air into the product and use the soap bubble method to determine whether the product is leaking. When the pressure required for measuring the leakage of a product is high or the leakage itself is high, the existing leakage detection device cannot reach the required pressure, or when it reaches the required pressure, it cannot accurately read the leakage value. There is an urgent need for a leakage detection device that can accurately read the leakage value and measure multiple pressure requirements.

[0003] In view of the above problems, it is urgent to design a leakage detection device that can measure different pressures and accurately read the leakage value to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is that it is impossible to accurately measure the air leakage value of a product in a set air pressure environment.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a pressure-adjustable air leakage detection device, comprising a sealed cabin, a booster fan connected to the cabin through an air supply pipe, and an exhaust pipe and a pressure measurement module connected to the sealed cabin, the air supply pipe and the exhaust pipe are respectively installed with a first gas flow meter and a second gas flow meter, a heat exchange cylinder is installed in the sealed cabin, and a drain pipe is connected to the bottom of the sealed cabin.

[0006] Preferably, a fan is fixedly installed in the heat exchange tube, and a thermal diode is arranged at the bottom of the heat exchange tube.

[0007] Preferably, the thermal diodes are distributed at equal angles along the axial direction of the heat exchange tube.

[0008] Preferably, the output end of the air supply pipe is connected to the coil through a support pipe fixed in the sealed cabin, the coil is spirally wound around the bottom of the heat exchange cylinder, and the bottom end of the coil is arranged downward.

[0009] Preferably, the support pipe is arranged obliquely relative to the axis of the heat exchange tube, and the distance between the bottom end of the support pipe and the heat exchange tube is greater than the distance between the top end of the support pipe and the heat exchange tube.

[0010] Preferably, a fixing rod is connected between the side wall of the supporting pipe and each section of the coil.

[0011] Preferably, the bottom end of the coil is arranged toward the outer wall of the heat exchange tube, and the bottom end of the coil is located directly above the drain pipe.

[0012] A pressure-adjustable air leakage detection method comprises the following steps: Step 1: Air tightness test: close the exhaust duct, start the booster fan to pressurize the cabin so that the air pressure in the cabin reaches the test pressure, and stabilize the pressure. Read the air pressure inside the cabin through the pressure measurement module to determine whether there is air leakage in the cabin; Step 2: Leakage detection: exhaust the pressurized gas in the cabin through the exhaust pipe, then connect the tested product to the exhaust pipe, start the heat exchange cylinder, and deliver pressurized gas to the cabin through the booster fan until the cabin pressure read by the pressure measurement module reaches the test pressure, and maintain the pressure in the cabin. When the pressure reaches the set time, read the reading Q of the first gas flow meter at the same time. n and the reading Q of the second gas flow meter n , recorded as the first set of data; Step 3: Repeat the measurement, maintain the pressure measurement module at a stable measurement value through the booster fan, and record a set of data at regular intervals. Record multiple sets of data. The reading of the second gas flow meter is the leakage of the product, and take the average of multiple sets of leakage to get the average leakage of the product.

[0013] 1. The present invention provides a pressure-adjustable air leakage detection device and method, in which compressed air is delivered to the cabin through a booster fan, the gas flow rate of the booster fan can be adjusted, and then the pressure in the cabin is adjusted. Gas flow meters are respectively provided on the air supply pipe and the exhaust pipe of the cabin. The test product is connected to the exhaust pipe, and the gas flow rate flowing into and out of the cabin through the pipe can be accurately read, thereby realizing accurate measurement of air leakage values ​​under different pressures.

[0014] 2. By installing coils and heat exchange tubes in the cabin and conducting heat in a one-way manner through thermal diodes, the temperature of the gas in the cabin is reduced, thereby reducing the water content of the gas, delivering dry air to the test products and ensuring the quality of the test products. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0016] In the figure: 1. Booster fan; 2. First gas flow meter; 3. Pressure measurement module; 4. Cabin; 5. Second gas flow meter; 6. Air supply pipe; 7. Exhaust pipe; 8. Support pipe; 9. Coil; 10. Drain pipe; 11. Heat exchange cylinder. DETAILED DESCRIPTION

[0017] As shown in the figure, the present invention provides a pressure-adjustable air leakage detection device, including a sealed cabin 4, a booster fan 1 connected to the cabin 4 through an air supply pipe 6, and an exhaust pipe 7 and a pressure measurement module 3 connected to the sealed cabin 4, the air supply pipe 6 and the exhaust pipe 7 are respectively installed with a first gas flow meter 2 and a second gas flow meter 5, a heat exchange tube 11 is installed in the sealed cabin 4, and a drain pipe 10 is connected to the bottom of the sealed cabin 4.

[0018] The air supply pipe 6 is a metal pipe, and the output end of the booster fan 1 is connected to the air supply pipe 6. The booster fan 1 pressurizes the interior of the cabin 4 through the air supply pipe 6. While pressurizing, the pressure value in the cabin 4 is detected by the pressure measurement module 3. When the pressure value reaches the set pressure value, the booster fan 1 is turned off. The first gas flow meter 2 is used to measure the gas flow from the booster fan 1 to the cabin 4; the second gas flow meter 5 is used to measure the gas flow output from the cabin 4 through the exhaust pipe 7, that is, the gas leakage of the tested product.

[0019] When the air pressure in the cabin 4 is stable, the reading of the first gas flow meter 2 should be equal to the reading of the second gas flow meter 5. If the reading of the first gas flow meter 2 is greater than the reading of the second gas flow meter 5, there is a gas leak in the cabin 4.

[0020] As a preferred embodiment of the present invention. A fan is fixedly installed in the heat exchange tube 11, and a thermal diode is arranged at the bottom of the heat exchange tube 11. The heat exchange tube 11 is a sandwich cylinder structure, the heat exchange tube 11 is fixedly installed in the cabin 4, a fan is installed at the inner top of the heat exchange tube 11 to discharge heat, and the thermal diode is installed in the interlayer of the heat exchange tube 11. The thermal diode is used for heat exchange of the coil 9, and cools the air entering the cabin 4, so that the water vapor condenses, and avoids the influence of humid air on the tested product during the test.

[0021] As a preferred embodiment of the present invention, in order to achieve uniform heat exchange, the thermal diodes are distributed at equal angles along the axial direction of the heat exchange tube 11 .

[0022] As a preferred embodiment of the present invention, the output end of the air supply pipe 6 is connected to the coil 9 through the support pipe 8 fixed in the sealed cabin 4, and the coil 9 is spirally wound at the bottom of the heat exchange tube 11, and the bottom end of the coil 9 is arranged downward. The coil 9 is wound at the bottom of the heat exchange tube 11, and the thermal diode is correspondingly installed at the bottom of the heat exchange tube 11, and the top of the heat exchange tube 11 is used to install a fan.

[0023] like Figure 1As shown. The support pipe 8 is arranged obliquely relative to the axis of the heat exchange tube 11, and the distance between the bottom end of the support pipe 8 and the heat exchange tube 11 is greater than the distance between the top end and the heat exchange tube 11. Air enters through the bottom of the support pipe 8 and enters the coil 9 from the top of the support pipe 8. Before entering the coil 9, it is necessary to prevent the water vapor in the air from liquefying to ensure that the air supply pipe 6 is in a dry state, so the gap between the bottom of the support pipe 8 and the heat exchange tube 11 is increased.

[0024] like Figure 1 As shown, in order to enhance the stability of the supporting pipe 8, a fixing rod is connected between the side wall of the supporting pipe 8 and each section of the coil 9.

[0025] like Figure 1 The bottom end of the coil 9 is arranged toward the outer wall of the heat exchange tube 11, and the bottom end of the coil 9 is located directly above the drain pipe 10. The drain pipe 10 is located outside the heat exchange tube 11, and the top of the drain pipe 10 is connected to the collection tank. The water flowing out of the coil 9 directly enters the collection tank and is discharged through the drain pipe 10 after the test.

[0026] A pressure-adjustable air leakage detection method comprises the following steps: Step 1: Air tightness test: close the exhaust pipe 7, start the booster fan 1 to pressurize the cabin 4, so that the air pressure in the cabin 4 reaches the air pressure used for testing, and stabilize the pressure. Read the air pressure inside the cabin 4 through the pressure measurement module 3 to determine whether there is air leakage in the cabin 4; Step 2: Leakage detection: exhaust the pressurized gas in the cabin 4 through the exhaust pipe 7, then connect the tested product to the exhaust pipe 7, start the heat exchange cylinder 11, and deliver pressurized gas to the cabin 4 through the booster fan 1 until the air pressure in the cabin 4 read by the pressure measurement module 3 reaches the air pressure used for detection, and maintain the pressure in the cabin 4. When the pressure is maintained for the set time, read the reading Q of the first gas flow meter 2 at the same time. n and the reading Q of the second gas flow meter 5 n , recorded as the first set of data; Step three, repeat the measurement, maintain the pressure measurement module 3 at a stable measurement value through the booster fan 1, and record a set of data at regular intervals, record multiple sets of data, calculate the leakage by subtracting the reading of the second gas flow meter 5 from the reading of the first gas flow meter 2, and take the average of the multiple sets of leakage to obtain the average leakage of the product.

Claims

1. A pressure-adjustable air leakage detection device, characterized in that: The invention comprises a sealed cabin (4), a booster fan (1) connected to the cabin (4) via an air supply pipe (6), and an exhaust pipe (7) and a pressure measurement module (3) connected to the sealed cabin (4); a first gas flow meter (2) and a second gas flow meter (5) are respectively installed on the air supply pipe (6) and the exhaust pipe (7); a heat exchange cylinder (11) is installed in the sealed cabin (4); and a drain pipe (10) is connected to the bottom of the sealed cabin (4).

2. A pressure-adjustable air leakage detection device as claimed in claim 1, characterized in that: A fan is fixedly installed inside the heat exchange tube (11), and a thermal diode is arranged at the bottom of the heat exchange tube (11).

3. A pressure-adjustable air leakage detection device as claimed in claim 2, characterized in that: The thermal diodes are distributed at equal angles along the axial direction of the heat exchange cylinder (11).

4. A pressure-adjustable air leakage detection device as claimed in claim 1, characterized in that: The output end of the air supply pipe (6) is connected to the coil (9) via a support pipe (8) fixed in the sealed chamber (4); the coil (9) is spirally wound around the bottom of the heat exchange cylinder (11), with the bottom end of the coil (9) arranged downward.

5. A pressure-adjustable air leakage detection device as claimed in claim 4, characterized in that: The support pipe (8) is arranged obliquely relative to the axis of the heat exchange tube (11), and the distance between the bottom end of the support pipe (8) and the heat exchange tube (11) is greater than the distance between the top end of the support pipe (8) and the heat exchange tube (11).

6. A pressure-adjustable air leakage detection device as claimed in claim 5, characterized in that: A fixing rod is connected between the side wall of the supporting pipe (8) and each section of the coil (9).

7. A pressure-adjustable air leakage detection device as claimed in claim 4, characterized in that: The bottom end of the coil (9) is arranged toward the outer wall of the heat exchange cylinder (11), and the bottom end of the coil (9) is located directly above the drain pipe (10).

8. A pressure-adjustable air leakage detection method as claimed in claim 1, characterized in that The steps include: Step 1: Air tightness test: close the exhaust pipe (7), start the booster fan (1) to pressurize the cabin (4), so that the air pressure in the cabin (4) reaches the air pressure used for testing, and stabilize the pressure. Read the air pressure inside the cabin (4) through the pressure measurement module (3) to determine whether there is air leakage in the cabin (4); Step 2: Leakage detection: the pressurized gas in the chamber (4) is discharged through the exhaust pipe (7), and then the test product is connected to the exhaust pipe (7). The heat exchange cylinder (11) is started, and the pressurized gas is delivered to the chamber (4) through the booster fan (1) until the air pressure in the chamber (4) read by the pressure measurement module (3) reaches the air pressure used for the test, and the pressure in the chamber (4) is maintained. When the pressure is maintained for a set time, the reading Q of the first gas flow meter (2) is read at the same time. n and the reading Q of the second gas flow meter (5) n , recorded as the first set of data; Step 3: Repeat the measurement, maintain the pressure measurement module (3) at a stable measurement value through the booster fan (1), and record a set of data at regular intervals. Record multiple sets of data, the reading of the second gas flow meter (5) is the leakage of the test product, and take the average of the multiple sets of leakage to obtain the average leakage of the product.

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