CN212963892U - Breathable film true water detection device - Google Patents

Abstract

The breathable film real water detection device comprises a test tool for placing a breathable film component to be detected, wherein a water cavity is formed in one side of the breathable film component in the test tool, a breathable cavity directly communicated with the external atmosphere is formed in the other side of the breathable film component, and a breathable film of the breathable film component forms a gas exchange channel between the water cavity and the breathable cavity; the water tank pressure testing device is characterized by further comprising an air loop and a water cavity loop, wherein a pressurizing loop used for pressurizing the water tank is arranged in the air loop, a water injection testing loop is arranged in the water cavity loop and comprises a water inlet valve and a pressure sensor, the water inlet end of the water inlet valve is communicated with the water tank, the water outlet end of the water inlet valve is communicated with the water cavity, and the pressure sensor is arranged on a pipeline between the water inlet valve and the water cavity. For the direct test method, carry out direct test through real water, make water and ventilated membrane direct contact in order to verify actual waterproof performance, detect water cavity pressure variation through high accuracy pressure sensor to can carry out high efficiency, high accuracy detection to electronic equipment's waterproof membrane part.

Description

Breathable film true water detection device

Technical Field

The utility model relates to a real water detection device of ventilated membrane for real water test of ventilated membrane part waterproof performance among the electronic equipment.

Background

The waterproof breathable film is a high-molecular waterproof material and is mainly applied to the fields of electronics, buildings, medical treatment and the like. The breathable film is widely applied to electronic equipment industries, particularly electronic products such as mobile phones and flat plates. With the development of the industry, higher requirements are provided for the waterproof performance of electronic equipment, and how to ensure that all breathable film products adopted on an electronic equipment production line have the waterproof performance meeting the requirements is an important subject of industry development.

At present, when the breathable film is applied to specific products, detection is generally not performed or only conventional water pressure detection is performed, but the detection can not achieve the precision which meets the waterproof grade requirement required by electronic equipment. Particularly, when the electronic device requires a waterproof performance higher than IPX 7, any imperceptible water seepage may affect the performance of the device or cause damage to the device, and meanwhile, because parts of the electronic device, such as speakers, and the like, need to keep air flow with the outside to ensure the performance, a complete sealing measure cannot be taken, and only the qualification rate of the electronic device can be ensured by improving the detection accuracy of the breathable film.

The existing detection scheme aiming at the breathable film cannot meet the requirements. For example, patent document 201420434792.9 provides a waterproof testing apparatus for an exhaust valve with a breathable waterproof membrane, in the process of testing the waterproof performance of the exhaust valve with the breathable waterproof membrane, compressed air is used to promote accumulated water in a hole site of a test step to impact the breathable waterproof membrane on the exhaust valve to be tested, and if the breathable waterproof membrane of the exhaust valve to be tested is damaged, the accumulated water accumulated in the hole site of the test step can permeate the breathable waterproof membrane in the exhaust valve under the action of the compressed air. However, when the accumulated water in the hole site of the step is subjected to impact test, a large amount of water bubbles are easily generated in the accumulated water, and the water bubbles cover the damaged point on the breathable waterproof membrane of the exhaust valve, so that the condition of the test structure is influenced.

Patent document 201521041405.6 is directed at above the damaged point problem on the ventilative waterproof membrane of aqueous vapor bubble cover discharge valve, utilizes the waterproof ventilated membrane in the waterproof ventilative valve of examination of high pressure water direct impact examination, consequently can avoid appearing aqueous vapor bubble cover the damaged point on the ventilative waterproof membrane and then influence the condition of test structure effectively to promote the waterproof test accuracy of waterproof ventilative valve.

Above-mentioned two schemes are mainly to the ventilative water proof membrane of the discharge valve that sets up on the outdoor industrial product casing to the waterproof test of ventilated membrane, discharge valve is used for keeping the inside and outside pressure equilibrium of outdoor industrial product casing, avoids taking place water, moisture, dust and the inside that the filth among the external environment got into the casing through sealed gap. The requirement for waterproof performance is low, so that the water leakage judgment can be carried out by simple water flow impact. The scheme can detect the waterproof breathable film products with obvious water leakage, but the breathable films slightly leaking to some electronic products with high requirements cannot be detected.

In addition, some slightly strict testing methods are available in the prior art, for example, patent 201210439348.1 discloses connecting a negative pressure device, completely immersing a vent window filter including a gas permeable membrane to be detected in water for injection, starting the negative pressure device to pump the vent window filter into a negative pressure state, controlling the air pressure to be-10 KPa to-100 KPa, maintaining the negative pressure to be 1S-20S, observing the vent window part of the vent window filter, and indicating that the seal of the vent window filter is not qualified if water for injection permeates into the vent window filter. According to the scheme, a negative pressure detection method is adopted according to the anti-pollution requirement of the medical industry, the waterproof breathable film product with obvious water leakage can be detected, but for the breathable film with only slight leakage, the air pressure fluctuation is small and is not easy to detect, the water seepage amount is very slight, the efficiency is low through an observation method, the accuracy and the effectiveness of observation are difficult to guarantee, and the breathable film product cannot be identified under the condition of extremely slight leakage.

Based on the situation, the scheme of the indirect breathable film waterproof testing device with higher detection precision is provided. In some cases, however, direct testing with real water is required, with the water in direct contact with the breathable film to verify the actual water resistance.

SUMMERY OF THE UTILITY MODEL

In view of above situation, the utility model provides a real water detection device of ventilated membrane can carry out high efficiency, high accuracy detection to electronic equipment's water proof membrane part, carries out direct test through real water, makes water and ventilated membrane direct contact in order to verify actual waterproof performance, not only can detect out comparatively obvious phenomenon of leaking, can also detect out the slight seepage condition to guarantee electronic equipment's waterproof performance.

According to the utility model, the device for detecting the real water of the breathable film comprises a testing tool for placing the breathable film component to be detected, wherein a water cavity is arranged on one side of the breathable film component in the testing tool, and the other side of the breathable film component is a breathable cavity directly communicated with the external atmosphere; the breathable film part is hermetically arranged between the water cavity and the breathable cavity, and a breathable film of the breathable film part forms a gas exchange channel between the water cavity and the breathable cavity; the water tank pressurization test system is characterized by further comprising an air loop and a water cavity loop, wherein a pressurization loop used for pressurizing the water tank is arranged in the air loop, a water injection test loop is arranged in the water cavity loop and comprises a water inlet valve and a pressure sensor, the water inlet end of the water inlet valve is communicated with the water tank, the water outlet end of the water inlet valve is communicated with the water cavity, and the pressure sensor is arranged on a pipeline between the water inlet valve and the water cavity.

Further, the water cavity loop further comprises a negative pressure pumping loop, the negative pressure pumping loop is provided with a drain valve, the water inlet end of the drain valve is communicated with the water cavity, and the water outlet end of the drain valve is communicated with the vacuum generator.

Furthermore, the pressurizing loop comprises an air source, a first air pressure regulating valve, a proportional valve and an air path one-way valve which are connected in sequence, and the air path one-way valve is connected with the water tank.

Preferably, the air circuit further comprises a negative pressure detection circuit, the negative pressure detection circuit comprises a second air pressure regulating valve connected with an air source, a vacuum valve and a vacuum generator, and the vacuum generator is connected with the water cavity through a drain valve.

Preferably, the air circuit further comprises a compression pipeline, the compression pipeline is provided with an air cylinder control valve connected with an air source, the air cylinder control valve is connected with an air cylinder, and a piston rod of the air cylinder is connected with a compression part of the test tool.

Preferably, still include the automatic return circuit that adds water, the automatic return circuit that adds water includes water feeding valve, water pitcher, level sensor, discharge valve and muffler, water feeding valve, level sensor, discharge valve are connected with the water pitcher respectively, and the muffler is connected with discharge valve.

Preferably, the water cavity loop further comprises an overflow extraction loop, the overflow extraction loop is provided with an overflow valve, the water inlet end of the overflow valve is communicated with the water cavity and/or an overflow cavity arranged below the water cavity, and the water outlet end of the overflow valve is communicated with the vacuum generator.

Further, the test fixture comprises a compression sealing plate and a lower fixing plate, a breathable film component is arranged between the compression sealing plate and the lower fixing plate, and a water cavity is formed between the breathable film component and the lower fixing plate.

Further, the test tool further comprises a test valve seat, and the compression sealing plate and the lower fixing plate are arranged on the test valve seat.

Further, still include underframe and upper cover, the upper cover is located on the underframe, test valve seat and compress tightly shrouding and bottom plate setting are on the upper cover. Other components are arranged in the bottom frame or fixedly connected with the bottom frame.

After the technology provided by the utility model is adopted, according to the utility model discloses a technical scheme has following beneficial effect:

1) for the direct test method, carry out direct test through real water, make water and ventilated membrane direct contact in order to verify actual waterproof performance, detect water cavity pressure variation through high accuracy pressure sensor to can carry out high efficiency, high accuracy detection to electronic equipment's waterproof membrane part.

2) Compared with the prior art, the breathable membrane component with serious water leakage (also called large leakage) can be rapidly identified and judged, and the testing efficiency is improved; but also can accurately identify and judge the breathable membrane component with slight leakage (also called micro leakage), thereby ensuring that the electronic equipment has the waterproof performance meeting the requirement.

3) The detection precision is high, the reliability is high, the breathable film component with the trace water leakage defect can be tested, and the matching adjustment can be carried out according to the waterproof requirements of different equipment.

4) The method has the advantages of convenient test and high detection speed, and is suitable for a small amount of detection such as laboratory detection, and is also suitable for being deployed on a production line of electronic equipment products or components for process inspection or final inspection.

5) Meanwhile, the structure is compact, the device is small and exquisite, different functions can be realized by different loops formed by all parts, and meanwhile, the requirements of multiple functional loops can be met by partial parts, so that the number of integral parts and the deployment cost are reduced.

Drawings

FIG. 1 shows a structure of a permeable membrane real water detection device according to an embodiment of the present invention;

fig. 2 shows a schematic view of a test fixture according to an embodiment of the present invention;

FIG. 3 illustrates an air circuit connection diagram of an embodiment of the present invention;

fig. 4 shows a connection diagram of an automatic water adding loop according to an embodiment of the present invention;

fig. 5 shows a water cavity circuit connection diagram of the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to embodiments shown in the drawings. The described embodiments include various specific details to aid understanding, but they are to be construed as merely illustrative, and not restrictive of all embodiments of the invention. Meanwhile, in order to make the description more clear and concise, a detailed description of functions and configurations well known in the art will be omitted.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "upper", "lower" or "above" and "below" in the present application refer to the upper and lower relationships as generally illustrated in the drawings of the present application. When the placement state changes, for example, when the placement state is turned over, the corresponding positional relationship should be changed accordingly to understand or implement the technical solution of the present application.

The breathable film real water detection device provided by the embodiment comprises a bottom frame 81 and an upper cover 82, wherein the upper cover 82 is arranged on the bottom frame 81. The test tool comprises a test valve seat 34, a compression sealing plate 36 and a lower fixing plate 35, wherein the compression sealing plate 36 and the lower fixing plate 35 are arranged on the test valve seat 34, the test valve seat 34 is arranged on the upper cover 82, and other components are arranged in the bottom frame 81 or fixedly connected with the bottom frame 81.

Fig. 1 is a structural diagram of a permeable membrane real water detection device according to an embodiment of the present application, wherein components of a control device and components of an overflow circuit are omitted for clarity, and an upper cover 82 and a bottom frame 81 are cut away to clearly see components of an air circuit, an automatic water adding circuit and a water cavity circuit inside.

The breathable film real water detection device provided by the embodiment tests a single breathable film part at each time, the position relation of the parts in the test tool is shown in fig. 2, and because the specific structures of different breathable film parts to be tested are not completely the same, but the test working principle and method are consistent with the present application, the schematic simplified expression is adopted in fig. 2 to more clearly illustrate the principle, structure and method of the present application.

As shown in fig. 2, the testing tool includes a pressing sealing plate 36 and a lower fixing plate 35, a breathable film component 60 is disposed between the pressing sealing plate 36 and the lower fixing plate 35, a water cavity is formed between the breathable film component 60 and the lower fixing plate 35, and the other side of the breathable film component 60 is a breathable cavity directly communicated with the external atmosphere.

The breathable film component 60 is hermetically arranged between the pressing sealing plate 36 and the lower fixing plate 35, and the breathable film of the breathable film component forms a gas exchange channel between the breathable cavity and the water cavity.

The atmosphere of the environment where the breathable film real water detection device is located when the external atmosphere refers to testing can be the atmospheric environment of the nature, and can also be a specific atmospheric environment created according to the product index requirements.

The device for detecting the real water of the breathable film provided by the embodiment detects whether the breathable film has water permeation (water leakage) or not, namely detects the waterproof performance of the breathable film. The other structural parts of the air-permeable membrane part 60, i.e. the parts of the components which are neither air-permeable nor water-impermeable, are fixed between the pressing close plate 36 and the lower fixing plate 35 by a sealing structure, for example, a sealing ring structure is used for fixing and sealing, so that the air-permeable cavity and the water cavity are isolated from each other, and there is no place for communication with each other except the air-permeable membrane.

Fig. 3 shows an air circuit of the breathable film real water detection device provided by this embodiment, which includes an air source, a first air pressure regulating valve 10, a second air pressure regulating valve 16, a proportional valve 14, an air path check valve 17, a vacuum valve 12, a vacuum generator 15, an air cylinder control valve 13, and a water tank 22.

The air source, the first air pressure regulating valve 10, the proportional valve 14 and the air path one-way valve 17 are connected in sequence, and the air path one-way valve 17 is connected with the water tank 22. Forming a water tank pressurization loop which is mainly used for providing real water meeting set pressure for the water cavity to be injected into the water cavity.

When the water tank supplies water into the water inlet cavity, the pressure is provided by the proportional valve in the pressurizing loop to perform pneumatic and hydraulic actions, and the check valve on the gas circuit ensures that the pressure in the water tank does not return to the proportional valve, so that the water inlet damage of the proportional valve is avoided.

The air loop also comprises a second air pressure regulating valve 16 connected with an air source, a vacuum valve 12 and a vacuum generator 15 to form a negative pressure detection loop, and the vacuum generator 15 is connected with the water cavity through a drain valve 31. A negative pressure is generated by the vacuum generator 15, and the water cavity is vacuumized and used for operating and confirming whether the air-permeable membrane part exists in the test tool and extracting air in the water cavity before the leakage test. The specific operation method comprises the steps of opening the vacuum valve and the drain valve, and detecting the pressure value of the pressure sensor of the water cavity to judge whether the breathable film part is placed or not.

The air circuit further comprises an air cylinder control valve 13 connected with an air source, the air cylinder control valve 13 is connected with an air cylinder 18 (an external matching component) to form a pressing pipeline, and a piston rod of the air cylinder 18 is connected with a pressing component of the testing tool. The piston rod of the control cylinder 18 moves up and down to press the product to be measured. In this embodiment, specifically, the piston rod of the cylinder 18 is connected to the pressing seal plate 36 of the test fixture, and the gas permeable membrane member 60 fixed between the pressing seal plate 36 and the lower fixing plate 35 is pressed by pressing the pressing seal plate 36.

Fig. 4 shows an automatic water adding circuit of the breathable film real water detection device provided by this embodiment, which includes a water adding valve 20, a water tank 22, a liquid level sensor 23, an exhaust valve 21, and a silencer 24.

The water adding valve 20, the liquid level sensor 23 and the exhaust valve 21 are respectively connected with the water tank 22, and the silencer 24 is connected with the exhaust valve 21 and used for exhausting the pressure in the water tank.

The liquid level sensor 23 in the automatic water adding loop is used for detecting whether water exists in the water tank 22 or not, after the water in the water tank 22 is judged, the water adding valve 20 and the exhaust valve 21 are closed, and if no water exists in the water tank 22, an alarm is given. Ensuring that there is water in the water tank 22 ensures effective water-proof detection. When the water adding valve 20 and the exhaust valve 21 are opened, a water adding loop is formed, and test water can be ensured.

The automatic water adding loop senses the water level in the water tank through an upper liquid level sensor and a lower liquid level sensor on the water tank inside the equipment, and when the water level is lower than a limit value, a water adding valve and an exhaust valve can be automatically opened, so that water can enter the water tank. When the water level reaches the upper limit, the water adding valve and the exhaust valve are closed, and the water adding is stopped. Therefore, the water level in the water tank can be kept consistent when the water is supplied into the water cavity every time. If the water level in the tank is lower than the lower limit, the alarm is given, and water is not supplied until the water level is full to the upper limit.

When water is added automatically, the pressure in the water tank is released through the exhaust valve and the silencer, and the problem that water cannot be added automatically due to the pressure in the water tank is avoided.

Fig. 5 shows a water cavity loop of the breathable film real water detection device provided by this embodiment, which includes a water inlet valve 30, a pressure sensor 32, a water discharge valve 31, an overflow valve 33, a test valve seat 34 of a test fixture, a pressure seal plate 36, and a lower fixing plate 35.

The water inlet valve 30, the pressure sensor 32 and corresponding pipelines form a water injection test loop, the water inlet end of the water inlet valve 30 is communicated with the water tank 22, the water outlet end of the water inlet valve 30 is communicated with the water cavity, and the pressure sensor 32 is arranged on the pipeline between the water inlet valve 30 and the water cavity.

The water discharge valve 31 in the water cavity loop and the vacuum generator 15 form a negative pressure pumping loop.

The pressing close plate 36 and the lower fixing plate 35 are provided with waterproof breathable film products, and a water injection test loop is formed from the water tank 22, the water inlet valve 30 and the pressure sensor 32 to the water cavity. When water is injected, the water tank is pressurized through the air loop, the water inlet valve and the water discharge valve which are connected with the water cavity are opened to fill the water cavity with water, then the water discharge valve is closed, the water cavity is continuously pressurized to the set pressure through the air loop, and the water inlet valve is closed.

The overflow valve 33 in the water cavity loop and the vacuum generator 15 form an overflow extraction loop, and the overflow extraction loop is used for solving the problem that when a test product leaks greatly, a large amount of water flows out from a product, so that a large amount of overflow of a working table is caused, and the production and safety are influenced, so that the function is increased. There is an overflow chamber below the product, and when the product leaks greatly, water can flow to the overflow intracavity, and the waste water tank is arranged into through vacuum generator with the overflow to the principle of rethread vacuum suction this moment, stops danger.

In the device for detecting the breathable film real water provided by the embodiment, in terms of selecting specific components, the water inlet valve 30, the water discharge valve 31, the overflow valve 33, the vacuum valve 12, the water adding valve 20, the exhaust valve 21 and other components all adopt two-way electromagnetic valves, so as to realize the on-off of the loop/branch where the two-way electromagnetic valve is located. The water cavity pressure sensor 32 is a pressure sensor for measuring water pressure, and can output an electric signal or a data signal by using the pressure sensor, thereby being beneficial to data display and collection, and can be processed by a control system so as to be convenient for debugging, control or realizing automatic operation.

The real water detection device of ventilated membrane that this embodiment provided, the waterproof test of ventilated membrane is carried out according to following step.

The first step is as follows: the air-permeable membrane unit 60 is fixed between the closing plate 36 and the lower fixing plate 35.

The second step is that: the vacuum valve 12 is opened, the drain valve 31 is opened, and negative pressure is generated by the vacuum generator 15 connected to the water chamber. Whether a breathable film part is to be tested in the testing tool is judged by detecting whether the water cavity has negative pressure, and if the water cavity has negative pressure and is within a set range, the breathable film part and the interior of the water cavity are judged to be normal. By the method, whether the breathable film component to be detected is loaded in the testing tool can be detected in advance before the waterproof detection of the breathable film is carried out, so that false detection and misinformation are avoided.

The third step: the water tank 22 is supplied with a preset pressure through the proportional valve 14, the water inlet valve 30 and the water discharge valve 31 are opened, and the water cavity formed between the breathable film part 60 and the lower fixing plate 35 in the water cavity valve seat 34 is filled with water.

The fourth step: the drain valve 31 is closed, the feed tank and the water chamber are continuously pressurized to the set test pressure through the proportional valve 14, and then the feed valve is closed.

The fifth step: the pressure sensor 32 on the water cavity pipeline detects the pressure change in the water cavity to judge whether the product leaks water. For example, a leak amount is set to a standard of 5Pa/S, and a defective product is determined when the detection pressure change rate is 5Pa/S or more, and a defective product is determined when the detection pressure change rate is less than 5 Pa/S.

And a sixth step: the drain valve 31 is opened to drain the pressure in the water cavity to normal pressure, and then the vacuum valve 12 is opened to drain residual water in the water cavity.

According to the test method, the automatic control of the detection process can be carried out by matching with the upper computer software developed by me department, and the detection result and the numerical value can be visually displayed. The device has the characteristics of short test period, high test precision, small and exquisite device and the like, and is convenient for the matching of an automatic production line of electronic products.

According to the breathable film real water detection device of the embodiment, a direct test method is adopted, direct test is carried out through real water, water is in direct contact with the breathable film to verify the actual waterproof performance, and the pressure change of the water cavity is detected through the high-precision pressure sensor, so that the waterproof film part of the electronic equipment can be subjected to high-efficiency and high-precision detection. Compared with the prior art, the breathable membrane component with serious water leakage (also called large leakage) can be rapidly identified and judged, and the testing efficiency is improved; but also can accurately identify and judge the breathable membrane component with slight leakage (also called micro leakage), thereby ensuring that the electronic equipment has the waterproof performance meeting the requirement. The detection precision is high, the reliability is high, the breathable film component with the trace water leakage defect can be tested, and the matching adjustment can be carried out according to the waterproof requirements of different equipment. The method has the advantages of convenient test and high detection speed, and is suitable for a small amount of detection such as laboratory detection, and is also suitable for being deployed on a production line of electronic equipment products or components for process inspection or final inspection. Meanwhile, the structure is compact, the device is small and exquisite, different functions can be realized by different loops formed by all parts, and meanwhile, the requirements of multiple functional loops can be met by partial parts, so that the number of integral parts and the deployment cost are reduced.

Claims (10)

1. The real water detection device for the breathable film is characterized by comprising a test tool for placing a breathable film component to be detected, wherein a water cavity is formed in one side of the breathable film component in the test tool, and a breathable cavity directly communicated with the external atmosphere is formed in the other side of the breathable film component; the breathable film part is hermetically arranged between the water cavity and the breathable cavity, and a breathable film of the breathable film part forms a gas exchange channel between the water cavity and the breathable cavity; the water tank pressurization test system is characterized by further comprising an air loop and a water cavity loop, wherein a pressurization loop used for pressurizing the water tank (22) is arranged in the air loop, a water injection test loop is arranged in the water cavity loop and comprises a water inlet valve (30) and a pressure sensor (32), the water inlet end of the water inlet valve (30) is communicated with the water tank (22), the water outlet end of the water inlet valve (30) is communicated with the water cavity, and the pressure sensor (32) is arranged on a pipeline between the water inlet valve (30) and the water cavity.

2. The breathable film real water detection device of claim 1, wherein the water chamber circuit further comprises a negative pressure pumping circuit, the negative pressure pumping circuit is provided with a drain valve (31), a water inlet end of the drain valve (31) is communicated with the water chamber, and a water outlet end of the drain valve (31) is communicated with the vacuum generator (15).

3. The breathable film real water detection device of claim 1, wherein the pressurization loop comprises an air source, a first air pressure regulating valve (10), a proportional valve (14) and an air path check valve (17) which are connected in sequence, and the air path check valve (17) is connected with the water tank (22).

4. The detection device for breathable film real water according to any one of claims 1 to 3, wherein the air circuit further comprises a negative pressure detection circuit, the negative pressure detection circuit comprises a second air pressure regulating valve (16) connected with an air source, a vacuum valve (12) and a vacuum generator (15), and the vacuum generator (15) is connected with the water cavity through a drain valve (31).

5. The breathable film real water detection device according to any one of claims 1 to 3, wherein the air circuit further comprises a compression pipeline, the compression pipeline is provided with a cylinder control valve (13) connected with an air source, the cylinder control valve (13) is connected with a cylinder (18), and a piston rod of the cylinder (18) is connected with a compression part of the test tool.

6. The breathable film real water detection device of any one of claims 1 to 3, further comprising an automatic water adding loop, wherein the automatic water adding loop comprises a water adding valve (20), a water tank (22), a liquid level sensor (23), an exhaust valve (21) and a silencer (24), the water adding valve (20), the liquid level sensor (23) and the exhaust valve (21) are respectively connected with the water tank (22), and the silencer (24) is connected with the exhaust valve (21).

7. The breathable membrane real water detection device according to any one of claims 1 to 3, wherein the water cavity loop further comprises an overflow extraction loop, the overflow extraction loop is provided with an overflow valve (33), the water inlet end of the overflow valve (33) is communicated with the water cavity and/or an overflow cavity arranged below the water cavity, and the water outlet end of the overflow valve (33) is communicated with the vacuum generator (15).

8. The device for detecting true water of the breathable film according to any one of claims 1 to 3, wherein the testing tool comprises a pressing sealing plate (36) and a lower fixing plate (35), a breathable film component (60) is arranged between the pressing sealing plate (36) and the lower fixing plate (35), and a water cavity is formed between the breathable film component (60) and the lower fixing plate (35).

9. The device for detecting the true water of the breathable film according to claim 8, wherein the testing tool further comprises a testing valve seat (34), and the pressing sealing plate (36) and the lower fixing plate (35) are arranged on the testing valve seat (34).

10. The device for detecting true water of a breathable film according to claim 9, further comprising a bottom frame (81) and an upper cover (82), wherein the upper cover (82) is disposed on the bottom frame (81), and the test valve seat (34), the pressing close plate (36) and the lower fixing plate (35) are disposed on the upper cover (82).

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