Filter element air tightness detection method and filter element air tightness detection device

Abstract

The invention discloses a filter element air tightness detection method and a filter element air tightness detection device. The filter element air tightness detection method comprises the steps that S1, an air storage unit is connected with a connector of a filter element in a sealed mode through a pipeline; s2, the filter element is immersed in water, and gas which changes color when encountering water is injected into the filter element; s3, the color of the water is observed, and if the color of the water changes, the filter element leaks air; otherwise, the detection unit is used for detecting new substances generated by the reaction of the gas and the water, and if yes, the filter element leaks gas. According to the method, gas which changes color when encountering water is injected into the filter element, if the filter element leaks gas, the gas is mixed with the water, and the water is colored, so that whether the air tightness of the filter element is qualified or not is judged, the gas leakage phenomenon is amplified, and the accuracy of air tightness detection of the filter element is improved; in addition, the detection unit can be used for detecting new substances produced by reaction of gas and water for further verification, if the detection unit detects the new substances, the filter element leaks gas, and if the detection unit does not detect the new substances, the air tightness of the filter element is better.

Description

Technical Field

[0001] The invention relates to a filter element air tightness detection method and a filter element air tightness detection device. Background Art

[0002] The filter element is a component made by rotary welding. During operation, the pressure inside the bottle is high. If there are cold welds and leaky welds at the weld line, the welds of the filter element are prone to water leakage. Therefore, in order to ensure that the filter element has good air tightness, the filter element needs to be tested for air tightness before use. In the prior art, there are two main methods for testing the air tightness of the water purifier filter element cylinder. One is to inflate the water purifier filter element cylinder and detect the air pressure changes in the water purifier filter element cylinder. If the air pressure in the water purifier filter element cylinder continues to decrease, it means that the air tightness of the filter element is poor. The other is to inflate the water purifier filter element cylinder and place it in water. If bubbles appear, it means that the air tightness is poor. Both of these test methods are not easy to detect slight leaks in the filter element, resulting in inaccurate test results. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defect of inaccurate detection results of the air tightness detection method of the filter element in the prior art, and to provide a filter element air tightness detection method and a filter element air tightness detection device.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A method for detecting air tightness of a filter element comprises the following steps:

[0006] S1. Sealingly connecting the gas storage unit to the interface of the filter element through a pipeline;

[0007] S2, immersing the filter element in water, and injecting a gas that changes color when in contact with water into the filter element;

[0008] S3. Observe the color of the water. If the color of the water changes, the filter element is leaking. Otherwise, use a detection unit to detect new substances generated by the reaction of the gas and the water. If there are any new substances, the filter element is leaking.

[0009] In the present scheme, the method for testing the air tightness of the filter element is carried out by injecting a gas that changes color when it comes into contact with water into the filter element. If the filter element leaks, the gas mixes with the water to make the water show color, thereby judging whether the air tightness of the filter element is qualified, amplifying the leakage phenomenon and improving the accuracy of the air tightness testing of the filter element. If the color change of the water is not obvious enough, further verification can be carried out by detecting the new substance produced by the reaction of gas and water through the detection unit. If the detection unit detects the new substance, the filter element is leaking. Conversely, if the detection unit does not detect the new substance, the air tightness of the filter element is better.

[0010] In step S1, the gas storage unit is sealed and connected to the interface of the filter element through a pipeline, a gas delivery channel is established between the gas storage unit and the filter element, and the gas in the gas storage unit is delivered to the filter element through the pipeline, so that the filter element is filled with gas.

[0011] In steps S2 and S3, the filter element is immersed in water and gas is injected into the filter element. If the filter element is leaking, bubbles can be directly observed emerging from the water. If the filter element has a small amount of slow leakage, the leaked gas is not sufficient to gather into bubbles, and it can be judged whether the filter element is leaking by observing the color change of the water. Furthermore, the detection unit can be used to detect new substances produced by the reaction of gas and water to improve the accuracy of air tightness detection.

[0012] Preferably, in step S1, the gas is chlorine gas.

[0013] In this solution, chlorine gas is mixed with water to make the water yellow-green, which is easy to observe. At the same time, chlorine gas also reacts with water to produce hydrochloric acid, making the water acidic, which is conducive to detection by the detection unit. Of course, in other solutions, the gas can also be bromine gas or other gases that can react with water and change the color of water.

[0014] Preferably, the detection unit includes a first PH test paper and a second PH test paper, and step S3 includes the steps of:

[0015] S31, using the first pH test paper to detect the pH value of the water before injecting gas into the filter element;

[0016] S32, using the second pH test paper to detect the pH value of the water after the filter element is injected with gas;

[0017] S33, comparing the difference between the pH value of the first pH test paper and the pH value of the second pH test paper, if the difference is greater than a first preset value, the filter element is leaking.

[0018] In this solution, the first PH test paper is used to detect the PH value of the water before the filter element is ventilated, and the second PH test paper is used to detect the PH value of the water after the filter element is ventilated. If the difference between the PH value of the first PH test paper and the PH value of the second PH test paper is greater than the first preset value, it can be determined that the filter element is leaking. Among them, this first preset value can be set according to the user. The first preset value is usually set so that the user can accurately determine whether the filter element is leaking. In other solutions, since the acidity of the water after ventilation is not lower than the acidity of the water before ventilation, a piece of PH test paper can also be used for testing twice. The first time, the PH test paper is used to detect the PH value of the water before the filter element is ventilated, and the second time, the same PH test paper is used to continue to detect the PH value of the water. If the filter element is leaking, the color of the PH test paper will continue to change, and the values ​​of the two PH test papers are recorded separately.

[0019] Of course, in other alternative solutions, other equipment can also be used to detect new substances produced by reactions in water.

[0020] Preferably, the detection unit also includes an image collector, which is used to respectively collect the grayscale image of the first PH test paper and the grayscale image of the second PH test paper; if the difference between the pixel value of the first PH test paper and the pixel value of the second PH test paper is greater than a second preset value, the filter element is leaking.

[0021] In this solution, compared with judging the color of the PH test paper by naked eyes, the grayscale image of the first PH test paper and the grayscale image of the second PH test paper are respectively collected by the image collector, and whether the pixel difference between the two is greater than the second preset value is used to determine whether the filter element is leaking. The detection result is more accurate and compensates for the error of naked eye recognition. Among them, the second preset value can be set according to the user.

[0022] A filter element air tightness detection device, which is used in the filter element air tightness detection method as described above, and comprises a water tank, a filter element fixing mechanism, an air storage unit and a driving mechanism, wherein the water tank has a accommodating chamber with a first opening at an upper end, the filter element fixing mechanism is used to fix the filter element, the filter element fixing mechanism is installed above the water tank and can be lifted and lowered in a vertical direction, the driving mechanism is used to drive the filter element fixing mechanism to be lifted and lowered in a vertical direction so that the filter element is submerged in or exposed in the water of the accommodating chamber through the first opening, and the air storage unit is used to connect the filter element and supply air to the filter element.

[0023] In this solution, the water tank is used to hold water, the filter element fixing mechanism is used to fix the filter element, and the driving mechanism is used to drive the filter element fixing mechanism to rise and fall, so that the filter element is immersed in water or exposed in flushing water through the first opening. The air storage unit is used to supply air to the filter element.

[0024] Preferably, the filter element fixing mechanism includes a support frame and a filter element seat, the filter element seat is installed on the support frame, the upper surface of the filter element seat has a receiving groove matching the outer diameter of the filter element, the receiving groove is extended in the horizontal direction, the bottom surface of the receiving groove has an air inlet docking with the interface of the filter element, and the air storage unit can be connected with the filter element through the air inlet.

[0025] In this solution, the accommodating groove is arranged horizontally, which facilitates the horizontal placement of the filter element and reduces the height of the filter element, so that the filter element can be submerged with a small amount of water. The filter element is fixed on the filter element seat through the accommodating groove and can also be connected to the air storage unit through the air inlet to achieve quick connection.

[0026] Preferably, there are two driving mechanisms, the two driving mechanisms are respectively installed at two ends of the support frame, and the two driving mechanisms are configured to be synchronously driven.

[0027] In this solution, by respectively arranging driving mechanisms at both ends of the support frame, and the two driving mechanisms are arranged synchronously, the force on the support frame is evenly applied, so that the support frame can be lifted and lowered smoothly.

[0028] Preferably, the driving mechanism includes a cylinder, a guide block and a sliding rod, the guide block is connected to the water tank, the sliding rod is passed through the guide block and extends in the vertical direction, the upper end of the sliding rod is connected to the support frame, and the telescopic rod of the cylinder is connected to the support frame.

[0029] In this solution, the cylinder drives the support frame to rise and fall through the telescopic rod, and the sliding rod slides up and down in the hole on the guide block. The sliding rod cooperates with the guide hole on the guide block to realize the guiding function, thereby improving the stability of the support frame when being lifted and lowered.

[0030] Preferably, the filter element air tightness detection device also includes a protective mechanism, which includes an outer shell, an exhaust pipe and a protective door, the outer shell has a accommodating chamber with a second opening, the protective door is installed at the second opening to close the accommodating chamber, and the protective door can be opened and closed, the water tank and the filter element fixing mechanism are both located inside the accommodating chamber, one end of the exhaust pipe is connected to the accommodating chamber, and the other end of the exhaust pipe is used to connect to an exhaust system.

[0031] In this solution, by setting up a protective mechanism, the filter element air tightness detection device can be kept in a closed state during the working process, and the exhaust pipe discharges harmful gases to prevent gas leakage and pollution of the environment, thereby ensuring the safety of the detection process. At the same time, the protective mechanism also protects the equipment.

[0032] Preferably, the filter element air tightness detection device also includes a detection unit, which includes a PH test paper and an image collector. The PH test paper is attached to the filter element seat, and the image collector is installed on the support frame for collecting the image of the PH test paper.

[0033] In this solution, the detection unit composed of pH test paper and image acquisition device can detect acidic substances generated by the reaction of gas and water, thereby improving the accuracy of detection.

[0034] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0035] The positive and progressive effect of the present invention is that the filter element air tightness detection method injects a gas that changes color when it comes into contact with water into the filter element. If the filter element leaks, the gas mixes with water to make the water show color, thereby judging whether the filter element is airtight or not, amplifying the leakage phenomenon and improving the accuracy of the filter element air tightness detection. If the color change of the water is not obvious enough, further verification can be carried out by detecting the new substance produced by the reaction of gas and water through the detection unit. If the detection unit detects the new substance, the filter element is leaking. Conversely, if the detection unit does not detect the new substance, the filter element has good air tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The figure is a flow chart of a method for detecting air tightness of a filter element according to a preferred embodiment of the present invention.

[0037] Figure 2 The structure diagram of the filter element air tightness detection device of a preferred embodiment of the present invention is as follows Figure 1 .

[0038] Figure 3 The structure diagram of the filter element air tightness detection device of a preferred embodiment of the present invention is as follows Figure 2 .

[0039] Figure 4 It is a structural schematic diagram of a filter element seat according to a preferred embodiment of the present invention.

[0040] Figure 5 The structure of the filter element air tightness detection device including the protection mechanism in a preferred embodiment of the present invention is shown in FIG. Figure 3 .

[0041] Description of reference numerals:

[0042] Water tank 1

[0043] Accommodating chamber 11

[0044] Filter element fixing mechanism 2

[0045] Support frame 21

[0046] Filter seat 22

[0047] Accommodating groove 221

[0048] Air Inlet 222

[0049] Driving mechanism 3

[0050] Cylinder 31

[0051] Telescopic rod 311

[0052] Guide block 32

[0053] Sliding rod 33

[0054] Protection mechanism 4

[0055] Housing 41

[0056] Accommodating chamber 411

[0057] Exhaust pipe 42

[0058] Protective door 43

[0059] Detection unit 5

[0060] Image collector 51

[0061] Filter 10

[0062] Open and close valve 20 DETAILED DESCRIPTION

[0063] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0064] like Figure 1 As shown, this embodiment discloses a filter element air tightness detection method, and the filter element air tightness detection method comprises the steps of:

[0065] S1. Sealingly connecting the gas storage unit to the interface of the filter element through a pipeline;

[0066] S2. Immerse the filter element in water and inject a gas that changes color when it comes into contact with water into the filter element;

[0067] S3. Observe the color of the water. If the color of the water changes, the filter element is leaking. Otherwise, use the detection unit to detect new substances generated by the reaction of gas and water. If there are any, the filter element is leaking.

[0068] In step S1, the gas storage unit (not shown in the figure) is sealed and connected to the interface of the filter element through a pipeline, and a gas delivery channel is established between the gas storage unit and the filter element. The gas in the gas storage unit can be delivered to the filter element through the pipeline, so that the filter element is filled with gas. In steps S2 and S3, the filter element is immersed in water, and the valve on the gas storage unit is opened to inject gas into the filter element through the pipeline. If the filter element leaks, the bubbles emerging from the water can be directly observed. If there is a small amount of slow leakage in the filter element, the leaked gas is not enough to gather into bubbles, and it can also be judged by observing the color change of the water. If the color change is not obvious, it can be further judged by detecting the new substance produced by the reaction of gas and water through the detection unit, thereby improving the accuracy of air tightness detection.

[0069] In this embodiment, the method for detecting air tightness of the filter element is carried out by injecting a gas that changes color when it comes into contact with water into the filter element. If the filter element is leaking, the gas mixes with the water to make the water appear colored, thereby judging whether the air tightness of the filter element is qualified, amplifying the leakage phenomenon, and improving the accuracy of the air tightness detection of the filter element. If the color change of the water is not obvious enough, further verification can be carried out by detecting the new substance produced by the reaction of the gas and water through the detection unit. If the detection unit detects the new substance, the filter element is leaking. Conversely, if the detection unit does not detect the new substance, the air tightness of the filter element is better.

[0070] In this embodiment, in step S1, the gas is chlorine. Chlorine mixes with water to turn the water into yellow-green, which is easy to observe. At the same time, chlorine also reacts with water to produce hydrochloric acid, making the water acidic, which is conducive to detection by the detection unit. Of course, in other embodiments, the gas can also be bromine or other gases that can react with water and change the color of water.

[0071] In this embodiment, the detection unit includes a first PH test paper and a second PH test paper, and step S3 includes the steps of:

[0072] S31, using a first pH test paper to detect the pH value of water before injecting air into the filter element;

[0073] S32, using a second pH test paper to detect the pH value of water after the filter element is filled with gas;

[0074] S33, comparing the difference between the pH value of the first pH test paper and the pH value of the second pH test paper, if the difference is greater than a first preset value, the filter element is leaking.

[0075] In step S31, the first PH test paper is used to detect the PH value of the water before the filter element is ventilated, and in step S32, the second PH test paper is used to detect the PH value of the water after the filter element is ventilated. If the difference between the PH value of the first PH test paper and the PH value of the second PH test paper is greater than the first preset value, it can be determined that the filter element is leaking. Among them, this first preset value can be set according to the user. Under normal circumstances, the first preset value is set so that the user can accurately determine whether the filter element has a leak.

[0076] In other alternative embodiments, since the acidity of the water after ventilation is not lower than the acidity of the water before ventilation, a piece of PH test paper can also be used for testing twice. The first time, the PH value of the water before the filter element is ventilated is tested with the PH test paper, and the second time, the PH value of the water is continuously tested with the same PH test paper, and the two values ​​of the PH test paper are recorded respectively. If the filter element is leaking, the color of the PH test paper will continue to change.

[0077] Of course, in other alternative embodiments, other equipment may also be used to detect new substances produced by reactions in water.

[0078] In this embodiment, the detection unit also includes an image collector, which is used to collect the grayscale image of the first PH test paper and the grayscale image of the second PH test paper respectively; if the difference between the pixel value of the first PH test paper and the pixel value of the second PH test paper is greater than the second preset value, the filter element is leaking. Compared with judging the color of the PH test paper by the naked eye, the grayscale image of the first PH test paper and the grayscale image of the second PH test paper are collected by the image collector respectively, and whether the pixel difference between the two is greater than the second preset value is used to determine whether the filter element is leaking. The detection result is more accurate and compensates for the error of naked eye recognition. Among them, the second preset value can be set according to the user.

[0079] like Figure 2-Figure 5 As shown, this embodiment also discloses a filter element air tightness detection device, which is used in the filter element air tightness detection method as described above, and the filter element air tightness detection device includes a water tank 1, a filter element fixing mechanism 2, an air storage unit and a driving mechanism 3. The water tank 1 has a accommodating chamber 11 with a first opening at the upper end, the filter element fixing mechanism 2 is used to fix the filter element 10, the filter element fixing mechanism 2 is installed above the water tank 1 and can be lifted and lowered in the vertical direction, the driving mechanism 3 is used to drive the filter element fixing mechanism 2 to lift and lower in the vertical direction, so that the filter element 10 is submerged in or exposed in the water of the accommodating chamber 11 through the first opening, and the air storage unit is used to connect the filter element 10 and supply air to the filter element. The water tank 1 is used to hold water, the filter element fixing mechanism 2 is used to fix the filter element 10, and the driving mechanism 3 is used to drive the filter element fixing mechanism 2 to lift and lower, so that the filter element 10 is submerged in water or exposed in flushing water through the first opening. The air storage unit is used to supply air to the filter element 10.

[0080] like Figure 2-Figure 5 As shown, the filter element fixing mechanism 2 includes a support frame 21 and a filter element seat 22. The filter element seat 22 is installed on the support frame 21. The upper surface of the filter element seat 22 has a receiving groove 221 that matches the outer diameter of the filter element 10. The receiving groove 221 is extended in the horizontal direction. The bottom surface of the receiving groove 221 has an air inlet 222 that docks with the interface of the filter element 10. The air storage unit can communicate with the filter element 10 through the air inlet 222. The receiving groove 221 is arranged horizontally, which is convenient for the filter element 10 to be placed horizontally and reduces the height of the filter element 10, so that the filter element 10 can be submerged with a small amount of water. The filter element 10 is fixed on the filter element seat 22 through the receiving groove 221, and can also be connected with the air storage unit through the air inlet 222 to achieve quick connection.

[0081] like Figure 2 , Figure 3 and Figure 5 As shown, in this embodiment, there are two driving mechanisms 3, which are respectively installed at both ends of the support frame 21, and the two driving mechanisms 3 are configured as a synchronous drive setting, so that the support frame 21 is evenly stressed, which facilitates the smooth lifting and lowering of the support frame 21.

[0082] like Figure 2 , Figure 3 and Figure 5 As shown, the driving mechanism 3 includes a cylinder 31, a guide block 32 and a sliding rod 33. The guide block 32 is connected to the water tank 1. The sliding rod 33 is inserted through the guide block 32 and extends in the vertical direction. The upper end of the sliding rod 33 is connected to the support frame 21. The telescopic rod 311 of the cylinder 31 is connected to the support frame 21. The cylinder 31 drives the support frame 21 to rise and fall through the telescopic rod 311, and the sliding rod 33 slides up and down in the hole on the guide block 32. The sliding rod 33 cooperates with the guide hole on the guide block 32 to realize the guiding function, thereby improving the stability of the filter element fixing mechanism 2 when rising and falling.

[0083] like Figure 2 As shown, in this embodiment, the number of the sliding rods 33 and the number of the guide blocks 32 are both two, and the two sliding rods 33 and the two guide blocks 32 are respectively arranged on both sides of the cylinder 31 to improve the guiding effect.

[0084] like Figure 5 As shown, the filter element air tightness detection device also includes a protective mechanism 4, which includes a shell 41, an exhaust pipe 42 and a protective door 43. The shell 41 has a second opening of the accommodating chamber 411, and the protective door 43 is installed at the second opening to close the accommodating chamber 411. The protective door 43 can be opened and closed. The water tank 1 and the filter element fixing mechanism 2 are both located inside the accommodating chamber 411. One end of the exhaust pipe 42 is connected to the accommodating chamber 411, and the other end of the exhaust pipe 42 is used to connect the exhaust system. By setting the protective mechanism 4, the filter element air tightness detection device can be in a closed state during the working process. The exhaust pipe 42 discharges harmful gases to prevent gas leakage and pollute the environment, thereby ensuring the safety of the detection process. At the same time, the protective mechanism 4 also protects the equipment.

[0085] like Figure 2 and Figure 3 As shown, the filter element air tightness detection device also includes a detection unit 5, which includes a pH test paper and an image collector 51. The pH test paper is attached to the filter element seat 22, and the image collector 51 is installed on the support frame 21 for collecting images of the pH test paper. The detection unit 5 composed of the pH test paper and the image collector 51 can detect acidic substances generated by the reaction of gas and water, thereby improving the accuracy of the detection. Preferably, the image collector 51 is a camera.

[0086] In this embodiment, the image collector 51 can collect the same PH test paper twice, the first time is before the filter element is ventilated, and the second time is after the filter element is ventilated. By processing the two collected images separately, the difference between the two images is obtained, and then it is determined whether the filter element is leaking.

[0087] like Figure 2 , Figure 3 and Figure 5As shown, in this embodiment, the water tank 1 is divided into three areas by two partitions, and filter element seats 22 are installed in the three areas. The air tightness test of the filter elements 10 can be performed simultaneously in the three areas, so that three filter elements 10 can be tested at one time to improve the efficiency of the filter element 10 testing.

[0088] In this embodiment, two on-off valves 20 are installed on the pipeline between the gas storage unit and the interface of the filter element 10, and the two on-off valves 20 are installed in series on the pipeline. During the test, only when the two on-off valves 20 are pressed at the same time, the pipeline is connected and the gas can be filled into the waterway of the filter element 10, which plays a protective role and ensures the safety of the experiment.

[0089] In the description of this article, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0090] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A filter element air tightness detection method, characterized in that: It includes the steps of: S1. Sealingly connecting the gas storage unit to the interface of the filter element through a pipeline; S2, immersing the filter element in water, and injecting a gas that changes color when in contact with water into the filter element; S3. Observe the color of the water. If the color of the water changes, the filter element is leaking. Otherwise, use a detection unit to detect new substances generated by the reaction of the gas and the water. If there are any new substances, the filter element is leaking.

2. The filter element air tightness detection method according to claim 1, characterized in that: In step S1, the gas is chlorine gas.

3. The filter element air tightness detection method according to claim 2, characterized in that: The detection unit includes a first PH test paper and a second PH test paper, and step S3 includes the steps of: S31, using the first pH test paper to detect the pH value of the water before injecting gas into the filter element; S32, using the second pH test paper to detect the pH value of the water after the filter element is injected with gas; S33, comparing the difference between the pH value of the first pH test paper and the pH value of the second pH test paper, if the difference is greater than a first preset value, the filter element is leaking.

4. The filter element air tightness detection method according to claim 3, characterized in that: The detection unit also includes an image collector, which is used to collect the grayscale image of the first PH test paper and the grayscale image of the second PH test paper respectively; if the difference between the pixel value of the first PH test paper and the pixel value of the second PH test paper is greater than a second preset value, the filter element is leaking.

5. A filter element air tightness detection device, characterized in that: The filter element air tightness detection device is used in the filter element air tightness detection method as described in any one of claims 1 to 4, and the filter element air tightness detection device includes a water tank, a filter element fixing mechanism, an air storage unit and a driving mechanism. The water tank has a accommodating chamber with a first opening at the upper end, and the filter element fixing mechanism is used to fix the filter element. The filter element fixing mechanism is installed above the water tank and can be lifted and lowered in the vertical direction. The driving mechanism is used to drive the filter element fixing mechanism to be lifted and lowered in the vertical direction so that the filter element is submerged in or exposed in the water of the accommodating chamber through the first opening, and the air storage unit is used to connect the filter element and supply air to the filter element.

6. The filter element air tightness detection device according to claim 5, characterized in that: The filter element fixing mechanism includes a support frame and a filter element seat, the filter element seat is installed on the support frame, the upper surface of the filter element seat has a receiving groove matching the outer diameter of the filter element, the receiving groove is extended in the horizontal direction, the bottom surface of the receiving groove has an air inlet docking with the interface of the filter element, and the air storage unit can be connected with the filter element through the air inlet.

7. The filter element air tightness detection device according to claim 6, characterized in that: The number of the driving mechanisms is two, and the two driving mechanisms are respectively installed at two ends of the support frame, and the two driving mechanisms are configured to be synchronously driven.

8. The filter element air tightness detection device according to claim 7, characterized in that: The driving mechanism includes a cylinder, a guide block and a sliding rod, the guide block is connected to the water tank, the sliding rod is passed through the guide block and extends in the vertical direction, the upper end of the sliding rod is connected to the support frame, and the telescopic rod of the cylinder is connected to the support frame.

9. The filter element air tightness detection device according to claim 5, characterized in that: The filter element air tightness detection device also includes a protective mechanism, which includes an outer shell, an exhaust pipe and a protective door. The outer shell has a accommodating chamber with a second opening. The protective door is installed at the second opening to close the accommodating chamber. The protective door can be opened and closed. The water tank and the filter element fixing mechanism are both located inside the accommodating chamber. One end of the exhaust pipe is connected to the accommodating chamber, and the other end of the exhaust pipe is used to connect to an exhaust system.

10. The filter element air tightness detection device according to claim 6, characterized in that: The filter element air tightness detection device also includes a detection unit, which includes a PH test paper and an image collector. The PH test paper is attached to the filter element seat, and the image collector is installed on the support frame for collecting the image of the PH test paper.

Images