Filter element detection device

Abstract

A filter element detection device comprises a chemical detector, the chemical detector is arranged in a first air channel communicated with an outlet of a chemical filter, the chemical detector comprises a shell, a first winding drum, a second winding drum, a first rotating wheel, a second rotating wheel, test paper, a driver and a color detector, and a working cavity is formed in the shell; a detection opening penetrating to the working cavity is formed in the side face of the shell, the first winding drum, the second winding drum, the first rotating wheel and the second rotating wheel are rotatably arranged in the working cavity, the test paper is wound around the first winding drum and sequentially wound around the first rotating wheel, the second rotating wheel and the second winding drum, and the test paper penetrates through the detection opening and is exposed out of the outer surface of the shell. The driver is in transmission connection with the test paper; the color detector is arranged on the shell; in conclusion, the chemical detector can judge the service life condition of the chemical filter element for multiple times, is very convenient and rapid, and is high in maintenance efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of filter detection, and in particular to a filter element detection device. Background Art

[0002] At present, the fuel cell of hydrogen and oxygen fuel cell vehicles is a device that uses precious metals as catalysts to generate electricity through electrochemical reactions between hydrogen and oxygen. When air enters the hydrogen fuel cell stack, since the components of the air include gases such as CO, NO2, SO2, some of the gases in the air will cause a certain degree of pollution to the precious metal catalysts inside the stack, causing the activity of the catalyst to decrease, thereby affecting the safety and stability of the operation of the hydrogen fuel cell. Therefore, in order to ensure the intake quality of the car's air, an air filter is usually installed at the air intake end leading to the hydrogen and oxygen fuel cell to eliminate the aforementioned gases that have adverse effects on the precious metal catalysts inside the stack. However, after the filter has been purified for a certain period of time, the filter element of the air filter will also reach the purification upper limit, and the purification effect will be reduced or lost. At this time, the service life of the filter element of the air filter has ended and it needs to be replaced.

[0003] In order to know when the life of the filter element of the air filter ends, some technical solutions will set a test paper assembly between the air filter and the hydrogen-oxygen battery, and regularly check and replace the test paper of the assembly to determine whether the life of the filter element has ended. However, this detection method is very cumbersome, and the test paper needs to be replaced for each inspection and judgment, resulting in low maintenance efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a filter element detection device to solve the technical problem that the device for detecting the filter element of the air filter of the hydrogen-oxygen battery is too troublesome to use, resulting in low maintenance efficiency.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a filter element detection device, including a chemical detector, which is arranged in a first air channel connected to the outlet of the chemical filter, the chemical detector includes a shell, a first drum, a second drum, a first wheel, a second wheel, a test paper, a driver and a color detector, a working chamber is provided in the shell, and a detection opening that penetrates into the working chamber is provided on the side of the shell, the first drum, the second drum, the first wheel and the second wheel are rotatably arranged in the working chamber, the test paper is rolled on the first drum and wound around the first wheel, the second wheel and the second drum in sequence, the test paper passes through the detection opening, and the test paper is exposed on the outer surface of the shell, the driver is transmission-connected to the test paper, and the driver is used to drive the test paper to move along its winding direction, and the color detector is arranged in the shell, and the color detector is used to detect the color of the part of the test paper that has passed through the detection opening.

[0006] Optionally, the first reel is disposed above the second reel at an interval, and the first rotating wheel is disposed above the second rotating wheel;

[0007] The chemical detector further includes a coating assembly, which includes a storage bottle and a coating roller. The storage bottle is disposed in the working chamber, the storage bottle is disposed above the test paper, a first accommodating chamber is disposed in the storage bottle, the first accommodating chamber is used to store absorption liquid, a coating groove connected to the first accommodating chamber is disposed on the bottom surface of the storage bottle, the coating roller is rotatably disposed in the coating groove, the coating roller blocks the communication port between the first accommodating chamber and the coating groove, and the coating roller is pressed on the top surface of the test paper;

[0008] When the test paper moves along its winding direction, the test paper drives the smear roller to rotate, so that the absorption liquid on the smear roller is smeared on the top surface of the test paper.

[0009] Optionally, the smear roller and the first rotating wheel are arranged correspondingly, and the smear roller and the first rotating wheel clamp the test paper.

[0010] Optionally, the color detector is used to detect the color of the bottom surface of the portion of the test paper located between the second rotating wheel and the second roller.

[0011] Optionally, the application assembly further includes a storage container and a buffer container, the buffer container is provided with a second accommodating chamber, the storage container is provided with a third accommodating chamber, the top surface of the shell is provided with a connecting hole extending through the working chamber, the storage bottle is fixed on the top surface of the working chamber, the buffer container is fixed on the top surface of the shell, the storage container is detachably mounted on the top surface of the buffer container, and the first accommodating chamber, the connecting hole, the second accommodating chamber and the third accommodating chamber are connected in sequence.

[0012] Optionally, the chemical detector also includes a driving gear, a first gear and a second gear, the driving gear, the first gear and the second gear are arranged in the working chamber, the driving gear is connected to the first gear and the second gear, the first gear is connected to the first roll, and the second gear is connected to the second roll, and the driver is used to drive the first roll and the second roll to rotate so that the test paper moves along its winding direction.

[0013] Optionally, the chemical detector also includes a third wheel and a fourth wheel, and the third wheel and the fourth wheel are rotatably disposed on the shell, and the third wheel and the fourth wheel protrude from the outer surface of the shell, and the test paper roll is disposed on the first roller and is wound around the first roller, the first wheel, the third wheel, the fourth wheel, the second wheel and the second roller.

[0014] Optionally, a controller is further included, the controller is connected to the driver and the color detector, and the controller is configured as follows:

[0015] After the driver drives the test paper to perform a movement cycle, the driver controls the color detector to detect the color of a designated position of the test paper, and the color detector transmits the detection result to the controller.

[0016] Optionally, a physical detector is also included, which is arranged in a second air channel connected to the outlet of the physical filter. The controller is connected to the physical detector. The physical detector continuously detects the air flow. When the physical detector detects that the actual flow is less than a certain value, the physical detector transmits an abnormal signal to the controller.

[0017] Optionally, it also includes multiple chemical detectors, and the inner wall of the first air channel is provided with multiple accommodating holes corresponding to the chemical detectors along its circumference, the chemical detectors are correspondingly arranged in the accommodating holes, and the test paper is flush with or protrudes from the inner wall of the first air channel.

[0018] Compared with the prior art, the filter element detection device according to the embodiment of the present invention has the following beneficial effects:

[0019] In the chemical detector of the present invention, the test paper is rolled on the first reel and is wound around the first wheel, the second wheel and the second reel in sequence. The driver can drive one or more of the reels and wheels to move the test paper along its winding direction. Specifically, the test paper passes through the first wheel, the second wheel and the second reel from the first reel in sequence. During this process, the unreacted test paper passes through the detection opening of the shell and is exposed outside the shell. The test paper contacts the air in the first air channel. The color of the test paper after contact is detected by the color detector and is finally rolled into the second reel. The color detector first calibrates a color. When the color detected by the color detector is different from the calibrated color, the chemical filter element is normal. When the color detected by the color detector is the same as the calibrated color, the chemical filter element is abnormal and the life of the chemical filter element ends. In summary, the chemical detector of the present invention can judge the life of the chemical filter element multiple times, which is very convenient and fast, and has high maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view of the chemical detector of the present invention.

[0021] Figure 2 for Figure 1 Sectional view of AA.

[0022] Figure 3 for Figure 2 A partial enlarged view of point B in the middle.

[0023] Figure 4 It is a left side view of the chemical detector of the present invention.

[0024] Figure 5 It is a structural schematic diagram of the filter element detection device of the present invention installed in the air channel.

[0025] Figure numerals: 1. chemical detector; 11. shell; 111. working chamber; 112. detection opening; 12. test paper; 13. drive; 14. color detector; 15a. first reel; 15b. second reel; 16a. first rotating wheel; 16b. second rotating wheel; 16c. third rotating wheel; 16d. fourth rotating wheel; 17a. first gear; 17b. second gear; 17c. driving gear; 18. coating assembly; 181. storage bottle; 1811. first accommodating chamber; 1812. coating groove; 182. coating roller; 183. buffer container; 1831. second accommodating chamber; 184. storage container; 1841. third accommodating chamber; 2. physical detector; 3. controller; 4. chemical filter; 5. physical filter. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "circumferential", etc. are based on the orientations or positional relationships 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.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] like Figures 1 to 5 As shown, a filter element detection device of the present invention includes a chemical detector 1, the chemical detector 1 is arranged in a first air channel connected to the outlet of a chemical filter 4, the chemical detector 1 includes a housing 11, a first reel 15a, a second reel 15b, a first rotating wheel 16a, a second rotating wheel 16b, a test paper 12, a driver 13 and a color detector 14, a working chamber 111 is arranged in the housing 11, a detection opening 112 penetrating to the working chamber 111 is arranged on the side of the housing 11, the first reel 15a, the second reel 15b, the first rotating wheel 16a, and the second rotating wheel 16b are rotatable The test paper 12 is movably arranged in the working chamber 111, the test paper 12 is rolled on the first reel 15a, and is wound around the first rotating wheel 16a, the second rotating wheel 16b and the second reel 15b in sequence, the test paper 12 passes through the detection opening 112, and the test paper 12 is exposed on the outer surface of the shell 11, the driver 13 is transmission-connected to the test paper 12, and the driver 13 is used to drive the test paper 12 to move along its winding direction, and the color detector 14 is arranged in the shell 11, and the color detector 14 is used to detect the color of the part of the test paper 12 that has passed through the detection opening 112.

[0030] In the above technical solution, the driver 13 can drive one or more of the reels and wheels to move the test paper 12 along its winding direction. Specifically, the test paper 12 passes through the first wheel 16a, the second wheel 16b and the second reel 15b from the first reel 15a in sequence. During this process, the unreacted test paper 12 passes through the detection opening 112 of the shell 11 and is exposed outside the shell 11. The test paper 12 contacts the air in the first air channel. After the contact, the color of the test paper 12 is detected by the color detector 14 and finally rolled up in the second reel 15b. The color detector 14 first calibrates a color. When the color detected by the color detector 14 is different from the calibrated color, the chemical filter element is normal. When the color detected by the color detector 14 is the same as the calibrated color, the chemical filter element is abnormal. Normally, the life of the chemical filter element ends. Furthermore, the color calibrated by the color detector 14 should be set according to the color after the reaction between the target component to be detected and the color developer component on the test paper 12; in summary, the chemical detector 1 of the present invention can judge the life of the chemical filter element multiple times, which is very convenient and fast, and the maintenance efficiency is high; in addition, since the air in the first air channel will only move rapidly along its axial direction, the first reel 15a, the second reel 15b, the first rotating wheel 16a and the second rotating wheel 16b are located in the working chamber 111, which can reduce the probability of the test paper 12 on the aforementioned components being contaminated by the air in the first air channel; further, the color detector 14 can specifically detect the color of the portion of the test paper 12 located between the detection opening 112 and the second reel 15b.

[0031] Furthermore, the first reel 15a is arranged above the second reel 15b at intervals, and the first rotating wheel 16a is arranged above the second rotating wheel 16b; the chemical detector 1 also includes a smearing assembly 18, and the smearing assembly 18 includes a storage bottle 181 and a smearing roller 182, the storage bottle 181 is arranged in the working chamber 111, the storage bottle 181 is arranged above the test paper 12, a first accommodating chamber 1811 is arranged in the storage bottle 181, the first accommodating chamber 1811 is used to store the absorption liquid, the bottom surface of the storage bottle 181 is provided with a smearing groove 1812 connected to the first accommodating chamber 1811, the smearing roller 182 is rotatably arranged in the smearing groove 1812, and the smearing roller 182 seals The connecting port between the first accommodating cavity 1811 and the smearing groove 1812 is blocked, and the smearing roller 182 is pressed against the top surface of the test paper 12; wherein, when the test paper 12 moves along its winding direction, the test paper 12 drives the smearing roller 182 to rotate, so that the absorption liquid on the smearing roller 182 is smeared on the top surface of the test paper 12; wherein, the test paper 12 itself has the component of a color developer, which can react with harmful components by itself, and smearing the absorption liquid on the test paper 12 is to accelerate the reaction between the test paper 12 and the harmful components. In addition, the absorption liquid in the storage bottle 181 is continuously in contact with the top surface of the smearing roller 182. When the smearing roller 182 rotates, the smearing roller 182 can continuously apply the absorption liquid to the uncontaminated part of the test paper 12.

[0032] Furthermore, the smear roller 182 and the first rotating wheel 16a are arranged correspondingly, and the smear roller 182 and the first rotating wheel 16a clamp the test paper 12 to ensure that the smear roller 182 can apply sufficient pressure to the test paper 12 to ensure effective smearing and prevent the smear roller 182 from causing damage to the test paper 12.

[0033] Furthermore, the color detector 14 is used to detect the color of the bottom surface of the test paper 12 located between the second rotating wheel 16b and the second reel 15b, so as to provide the test paper 12 with a certain reaction time. When the color of the test paper 12 changes, it is ensured that the color detector 14 can actually detect the changed color.

[0034] Furthermore, the smear component 18 also includes a storage container 184 and a buffer container 183, the buffer container 183 is provided with a second accommodating chamber 1831, the storage container 184 is provided with a third accommodating chamber 1841, the top surface of the shell 11 is provided with a connecting hole extending through the working chamber 111, the storage bottle 181 is fixedly arranged on the top surface of the working chamber 111, the buffer container 183 is fixedly arranged on the top surface of the shell 11, the storage container 184 is detachably mounted on the top surface of the buffer container 183, the first accommodating chamber 1811, the connecting hole, the second accommodating chamber 1831 and the third accommodating chamber 1841 are connected in sequence; wherein, the storage container 184 can be removed or replaced to facilitate the addition of absorption liquid; further, the horizontal cross-sectional area of ​​the second accommodating chamber 1831 is larger than the horizontal cross-sectional area of ​​the third accommodating chamber 1841 The height of the second accommodating chamber 1831 is smaller than the height of the third accommodating chamber 1841, so as to effectively increase the storage volume of the absorption liquid while reducing the pressure of the absorption liquid on the coating roller 182, thereby reducing the risk of leakage of the absorption liquid from the coating roller 182; further, the storage container 184 can be connected to the buffer container 183 through a switch valve. When the second accommodating chamber 1831 is full of liquid, the switch valve is closed to reduce the hydraulic pressure received by the coating roller 182. When the absorption liquid in the second accommodating chamber 1831 and even the first accommodating chamber 1811 is exhausted, the switch valve can be opened to add absorption liquid; further, the connecting hole and the position where the storage container 184 is connected to the buffer container 183 are provided with a certain distance in the horizontal direction to prevent the absorption liquid in the third accommodating chamber 1841 from directly impacting the coating roller 182, thereby reducing the risk of leakage of the absorption liquid from the coating roller 182.

[0035] Furthermore, the chemical detector 1 also includes a driving gear 17c, a first gear 17a and a second gear 17b, wherein the driving gear 17c, the first gear 17a and the second gear 17b are arranged in the working chamber 111, the driving gear 17c is connected to the first gear 17a and the second gear 17b, the first gear 17a is connected to the first reel 15a, and the second gear 17b is connected to the second reel 15b, and the driver 13 is used to drive the first reel 15a and the second reel 15b to rotate so that the test paper 12 moves along its winding direction; wherein the first gear 17a and the second gear 17b have the same structure and size to ensure the consistency of movement of various parts of the test paper 12, the first gear 17a can be connected to the first reel 15a by a rotating shaft, and the second gear 17b can be connected to the second reel 15b by a rotating shaft.

[0036] Furthermore, the chemical detector 1 further comprises a third rotating wheel 16c and a fourth rotating wheel 16d, wherein the third rotating wheel 16c and the fourth rotating wheel 16d are rotatably disposed on the housing 11, and the third rotating wheel 16c and the fourth rotating wheel 16d protrude from the outer surface of the housing 11, and the test paper 12 is rolled up on the first reel 15a, and is wound around the first reel 15a, the first rotating wheel 16a, the third rotating wheel 16c, the fourth rotating wheel 16d, the second rotating wheel 16b and the second reel 15b; wherein, The third rotating wheel 16c and the fourth rotating wheel 16d protrude from the outer surface of the shell 11 to ensure that the test paper 12 can be completely exposed to the air in the first air channel, thereby increasing the probability of the test paper 12 reacting with harmful gases; further, the third rotating wheel 16c and the fourth rotating wheel 16d can be completely located outside the working chamber 111, or can pass through the detection opening 112. At this time, part of the third rotating wheel 16c and the fourth rotating wheel 16d are located in the working chamber 111, and the other part protrudes from the outer surface of the shell 11.

[0037] Furthermore, it also includes a controller 3, which is connected to the driver 13 and the color detector 14, and the controller 3 is configured as follows: after the driver 13 drives the test paper 12 to perform a movement cycle, the color detector 14 is controlled to detect the color of a specified position of the test paper 12, and the color detector 14 transmits the detection result to the controller 3; wherein, the test paper 12 is rolled up at a position on the first reel 15a, and after the driver 13 drives the test paper 12 to perform a movement cycle, the position moves to be rolled up on the second reel 15b.

[0038] Further, it also includes a physical detector 2, which is arranged in a second air channel connected to the outlet of the physical filter 5, and the controller 3 is connected to the physical detector 2. The physical detector 2 continuously detects the air flow rate. When the physical detector 2 detects that the actual flow rate is less than a certain value, the physical detector 2 transmits an abnormal signal to the controller 3; wherein, when the actual flow rate is less than a certain value, it indicates that the filter element of the physical filter 5 has an abnormality; in addition, the first air channel and the second air channel can be the same air channel.

[0039] Furthermore, it includes multiple chemical detectors 1, and the inner wall of the first air channel is provided with multiple accommodating holes corresponding to the chemical detectors 1 along its circumference, and the chemical detectors 1 are correspondingly arranged in the accommodating holes, and the test paper 12 is flush with or protrudes from the inner wall of the first air channel; wherein, one chemical detector 1 detects one harmful component, and multiple chemical detectors 1 respectively detect multiple harmful components.

[0040] Furthermore, the specific connection methods of the fixed setting and the fixed connection refer to the relative position relationship of two components that can be fixedly connected, including fixing by a connecting piece, fixing by welding, fixing by an adhesive, fixing by one-piece molding, and fixing by a snap connection.

[0041] Furthermore, the rotational connection refers to the ability of two connected parts to rotate, including connection through bearings and connection through clearance fit.

[0042] Furthermore, the connecting parts include fasteners, straps, ties, pneumatic connecting elements, hydraulic connecting elements, flange plates, Velcro, and buttons.

[0043] In summary, the embodiment of the present invention provides a filter element detection device, and its technical effects are:

[0044] In the chemical detector 1 of the present invention, the test paper 12 is rolled on the first reel 15a and is sequentially wound around the first rotating wheel 16a, the second rotating wheel 16b and the second reel 15b. The driver 13 can drive one or more of the reels and the rotating wheels to move the test paper 12 along its winding direction. Specifically, the test paper 12 passes through the first rotating wheel 16a, the second rotating wheel 16b and the second reel 15b from the first reel 15a in sequence. During this process, the unreacted test paper 12 passes through the detection opening 112 of the housing 11 and is exposed outside the housing 11. The test paper 12 and The test paper 12 comes into contact with the air in the first air channel, and the color of the test paper 12 is detected by the color detector 14 after the contact, and finally rolled into the second roll 15b, wherein the color detector 14 first calibrates a color, when the color detected by the color detector 14 is different from the calibrated color, the chemical filter element is normal, when the color detected by the color detector 14 is the same as the calibrated color, the chemical filter element is abnormal, and the life of the chemical filter element is over; in summary, the chemical detector 1 of the present invention can judge the life of the chemical filter element multiple times, which is very convenient and fast, and has high maintenance efficiency.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A filter element detection device, It is characterized in that The invention comprises a chemical detector (1), wherein the chemical detector (1) is arranged in a first air passage connected to an outlet of a chemical filter (4), wherein the chemical detector (1) comprises a housing (11), a first reel (15a), a second reel (15b), a first rotating wheel (16a), a second rotating wheel (16b), a test paper (12), a driver (13) and a color detector (14); a working chamber (111) is arranged in the housing (11), a detection opening (112) penetrating to the working chamber (111) is arranged on a side of the housing (11), and the first reel (15a), the second reel (15b), the first rotating wheel (16a) and the second rotating wheel (16b) are rotatably arranged in the housing (11). In the working chamber (111), the test paper (12) is rolled up on the first reel (15a), and is sequentially wound around the first rotating wheel (16a), the second rotating wheel (16b) and the second reel (15b); the test paper (12) passes through the detection opening (112), and the test paper (12) is exposed on the outer surface of the shell (11); the driver (13) is transmission-connected to the test paper (12), and the driver (13) is used to drive the test paper (12) to move along its winding direction; the color detector (14) is arranged on the shell (11), and the color detector (14) is used to detect the color of the portion of the test paper (12) that has passed through the detection opening (112).

2. The filter element detection device according to claim 1, It is characterized in that The first reel (15a) is arranged above the second reel (15b) at a distance, and the first rotating wheel (16a) is arranged above the second rotating wheel (16b); The chemical detector (1) further comprises a smearing assembly (18), the smearing assembly (18) comprising a storage bottle (181) and a smearing roller (182), the storage bottle (181) being arranged in the working chamber (111), the storage bottle (181) being arranged above the test paper (12), the storage bottle (181) being provided with a first accommodating chamber (1811), the first accommodating chamber (1811) being used for storing absorption liquid, the bottom surface of the storage bottle (181) being provided with a smearing groove (1812) connected to the first accommodating chamber (1811), the smearing roller (182) being rotatably arranged in the smearing groove (1812), the smearing roller (182) blocking the communication port between the first accommodating chamber (1811) and the smearing groove (1812), the smearing roller (182) being pressed against the top surface of the test paper (12); When the test paper (12) moves along its winding direction, the test paper (12) drives the smear roller (182) to rotate, so that the absorption liquid on the smear roller (182) is smeared on the top surface of the test paper (12).

3. The filter element detection device according to claim 2, It is characterized in that The smear roller (182) and the first rotating wheel (16a) are arranged correspondingly, and the smear roller (182) and the first rotating wheel (16a) clamp the test paper (12).

4. The filter element detection device according to claim 2, It is characterized in that The color detector (14) is used to detect the color of the bottom surface of the portion of the test paper (12) located between the second rotating wheel (16b) and the second reel (15b).

5. The filter element detection device according to claim 2, It is characterized in that The application assembly (18) further includes a storage container (184) and a buffer container (183); the buffer container (183) is provided with a second accommodating chamber (1831); the storage container (184) is provided with a third accommodating chamber (1841); the top surface of the shell (11) is provided with a connecting hole extending through the working chamber (111); the storage bottle (181) is fixedly arranged on the top surface of the working chamber (111); the buffer container (183) is fixedly arranged on the top surface of the shell (11); the storage container (184) is detachably mounted on the top surface of the buffer container (183); the first accommodating chamber (1811), the connecting hole, the second accommodating chamber (1831) and the third accommodating chamber (1841) are connected in sequence.

6. The filter element detection device according to claim 1, It is characterized in that The chemical detector (1) further comprises a driving gear (17c), a first gear (17a) and a second gear (17b); the driving gear (17c), the first gear (17a) and the second gear (17b) are arranged in the working chamber (111); the driving gear (17c) is connected to the first gear (17a) and the second gear (17b); the first gear (17a) is connected to the first reel (15a); the second gear (17b) is connected to the second reel (15b); the driver (13) is used to drive the first reel (15a) and the second reel (15b) to rotate so as to move the test paper (12) along its winding direction.

7. The filter element detection device according to claim 1, It is characterized in that The chemical detector (1) further comprises a third rotating wheel (16c) and a fourth rotating wheel (16d), wherein the third rotating wheel (16c) and the fourth rotating wheel (16d) are rotatably arranged on the housing (11), and the third rotating wheel (16c) and the fourth rotating wheel (16d) protrude from the outer surface of the housing (11); the test paper (12) is rolled up on the first reel (15a), and is wound around the first reel (15a), the first rotating wheel (16a), the third rotating wheel (16c), the fourth rotating wheel (16d), the second rotating wheel (16b) and the second reel (15b).

8. The filter element detection device according to claim 1, It is characterized in that The device further comprises a controller (3), wherein the controller (3) is connected to the driver (13) and the color detector (14), and the controller (3) is configured as follows: After the driver (13) drives the test paper (12) to perform a movement cycle, the driver (13) controls the color detector (14) to perform a detection on the color of a designated position of the test paper (12), and the color detector (14) transmits the detection result to the controller (3).

9. The filter element detection device according to claim 8, It is characterized in that It also includes a physical detector, which is arranged in a second air channel connected to the outlet of the physical filter (5). The controller (3) is connected to the physical detector. The physical detector continuously detects the air flow rate. When the physical detector detects that the actual flow rate is less than a certain value, the physical detector transmits an abnormal signal to the controller (3).

10. The filter element detection device according to claim 1, It is characterized in that It also includes a plurality of chemical detectors (1), the inner wall of the first air channel is provided with a plurality of accommodating holes corresponding to the chemical detectors (1) along its circumference, the chemical detectors (1) are arranged correspondingly in the accommodating holes, and the test paper (12) is flush with or protrudes from the inner wall of the first air channel.

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