Vehicle-mounted atmospheric volatile organic compound detection device

Abstract

The utility model discloses a vehicle-mounted atmospheric volatile organic compound detection device, and belongs to the technical field of analysis and detection. A vehicle-mounted atmosphere volatile organic compound detection device comprises an air duct and an air pump, the air duct is fixed to the output end of the air pump, and the vehicle-mounted atmosphere volatile organic compound detection device further comprises an ionization unit fixedly installed in the air duct and used for converting volatile organic compounds in an air sample into charged ions; the adsorption unit is fixedly mounted in the air duct, is connected with the ionization unit and is used for capturing and enriching charged ions; the data communication unit is used for transmitting the monitoring data to an external device or a cloud server, neutral molecules (including VOCs) in an air sample are ionized to form charged ions through the arrangement of the ionization unit and the adsorption unit, the charged VOCs ions make contact with an efficient adsorption material in the adsorption unit and are captured, and after a period of time, the VOCs in the air sample can be detected. A large number of low-concentration VOCs are enriched on the adsorption material, a high-concentration sample is formed, and the adsorption efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to analysis detection technical field especially, relate to a detection device of vehicular atmospheric volatile organic compound. BACKGROUND

[0002] With the development of modern industry and the acceleration of urbanization, air pollution problem is increasingly serious, especially the emission of volatile organic compounds (VOCs) poses a significant threat to environmental quality and human health, VOCs not only cause photochemical smog and ozone layer destruction, but also may cause respiratory diseases and other health problems, therefore, real-time monitoring of VOCs concentration in the atmosphere becomes an important task of environmental protection and public health management.

[0003] At present, the commonly used VOCs detection method and technology include laboratory analysis, portable sensor and fixed site monitoring, although the above-mentioned methods have characteristics, but in practical application can only provide local information, for mobile pollution sources or wide range of environmental changes reaction is slow, and subject to the existing instrument detection limit, the existing instrument detection adopts large volume airflow through adsorbent, or the adsorption material is placed in the air to be measured for a long time, a disadvantage of these methods is that almost all organic matter has adsorption effect, and the adsorbent utilization efficiency is not high. SUMMARY

[0004] The utility model discloses a detection device of vehicular atmospheric volatile organic compound to solve the problem of adsorbent in prior art adsorbing all organic matter, and the adsorbent utilization efficiency is not high.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A detection device of vehicular atmospheric volatile organic compound, including the air duct and the air pump, the air duct with the air pump output end fixed, still include: ionization unit, fixed mounting in the air duct, for converting volatile organic compounds in air sample into charged ions, adsorption unit, fixed mounting in the air duct, with Ionization unit is connected, for capturing and enriching the charged ion, data communication unit, for transmitting monitoring data to external equipment or cloud server.

[0007] In order to produce corona discharge through high voltage electrode, make the neutral molecule (including VOCs) in air ionization, form the charged ion, preferably, the ionization unit includes: corona discharge ionizer, is equipped with positive electrode and negative electrode, for producing high voltage electrode, make the neutral molecule in air ionization, ion guide plate, for guiding the charged ion to move towards adsorption unit.

[0008] In order to enhance the attraction to positively charged VOC ions, improve the selectivity and efficiency of adsorption, further, the adsorption unit comprises: enrichment membrane, installed at the negative electrode of the corona discharge ionizer; temperature control module, for adjusting the working temperature of the adsorption material.

[0009] In order to realize the remote management and maintenance of the system, further, the data communication unit comprises: a wireless communication module comprising one or more of Wi-Fi, Bluetooth or cellular network for remote data transmission and command reception; user interface, the user interface comprises a display screen or an indicator light, which provides intuitive operation feedback and status prompt.

[0010] In order to remove large particles and other non-gaseous pollutants, further, the air duct comprises a pre-filtering bin and a detection bin, a valve is installed between the pre-filtering bin and the detection bin; wherein the ionization unit, the adsorption unit and the data communication unit are installed in the detection bin.

[0011] In order to prevent the accumulation of fine particles and maintain high filtration efficiency, further, the pre-filtering bin is provided with a filter screen at one end away from the detection bin, a filter membrane is installed in the pre-filtering bin, a rotating shaft is installed between the filter screen and the filter membrane, an impeller is fixedly installed on the rotating shaft, and the rotating shaft is rotatably connected with the valve; wherein a first brush is fixedly installed on the rotating shaft, and the first brush abuts against the filter membrane.

[0012] In order to maintain the proper contact pressure between the rotating shaft and the valve, ensure the sealing performance and smooth switching of the valve, further, a mounting seat for supporting the rotating shaft is fixedly installed in the pre-filtering bin, a spring is movably installed on the rotating shaft, and the two ends of the spring abut against the mounting seat and the valve respectively.

[0013] In order to let the particles be discharged through the dust falling port and keep the internal environment clean, further, the filter membrane is slidingly installed in the pre-filtering bin, a baffle is rotatably installed on the filter membrane through an elastic member, and a dust falling port matched with the baffle is formed in the pre-filtering bin.

[0014] In order to improve the particle discharge efficiency, further, first protrusions are symmetrically installed on both sides of the baffle, the first protrusions are equidistantly arranged, and second protrusions are fixedly installed on the outer wall of the pre-filtering bin and abut against the first protrusions.

[0015] In order to wipe the particles adhering to the surface of the filter screen and improve the air intake efficiency, further, a second brush is fixedly installed on the rotating shaft away from the valve and penetrates through the filter screen.

[0016] Compared with the prior art, this utility model provides a vehicle-mounted atmospheric volatile organic compound detection device, which has the following beneficial effects:

[0017] 1. This vehicle-mounted atmospheric volatile organic compound detection device, through the setting of ionization unit and adsorption unit, ionizes neutral molecules (including VOCs) in air samples to form charged ions. The charged VOCs ions come into contact with and are captured by the highly efficient adsorption material in the adsorption unit. After a period of time, a large number of low-concentration VOCs are enriched on the adsorption material, forming a sample with a higher concentration, thereby improving the adsorption efficiency.

[0018] 2. This vehicle-mounted atmospheric volatile organic compound (VOC) detection device uses a filter screen installed at the end of the pre-filtration chamber away from the detection chamber to pre-filter the air sample entering the system, removing large particles and other non-gaseous pollutants, and effectively capturing large particles such as dust, pollen, and smoke. A filter membrane is installed in the pre-filtration chamber to further filter the air sample after it has passed through the filter screen, removing finer particles and some VOCs. A rotating shaft is installed between the filter screen and the filter membrane, and an impeller is fixedly installed on the rotating shaft. When the air pump draws in the air sample, the impeller is driven to rotate, which enhances the flow and uniform distribution of the airflow and improves the filtration efficiency.

[0019] 3. In this vehicle-mounted atmospheric volatile organic compound detection device, when the valve core is opened, the rotating shaft will drive the filter membrane to slide a certain distance in the pre-filtration chamber. At this time, the baffle tightly fits the dust discharge port, making the pre-filtration chamber a relatively sealed environment. The first brush wipes the dust on the filter membrane onto the baffle. When the air pump is turned off, the spring drives the valve core to reset, and the baffle resets along with the filter membrane, allowing the particulate matter to be discharged through the dust discharge port. During the discharge process, the first protrusion on the surface of the baffle continuously contacts the second protrusion on the outer wall of the pre-filtration chamber, generating vibration and improving the particulate matter discharge efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a vehicle-mounted atmospheric volatile organic compound detection device proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of a vehicle-mounted atmospheric volatile organic compound detection chamber proposed in this utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of a vehicle-mounted pre-filter for volatile organic compounds.

[0023] Figure 4 This is a schematic diagram of a baffle installation structure for vehicle-mounted atmospheric volatile organic compounds proposed in this utility model.

[0024] In the figure: 1, the air duct; 101, the pre-filter bin; 102, the detection bin; 103, the ash outlet; 104, the second protrusion; 2, the air pump; 3, the ionization unit; 301, the corona discharge ionizer; 302, the ion guide plate; 4, the adsorption unit; 401, the enrichment membrane; 402, the temperature control module; 5, the data communication unit; 6, the valve; 7, the filter screen; 8, the filter membrane; 9, the rotating shaft; 10, the impeller; 11, the first brush; 12, the mounting seat; 13, the spring; 14, the baffle; 1401, the first protrusion; 15, the second brush. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0026] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "top", "bottom", "in", "out" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0027] Embodiment:

[0028] Reference Figures 1-4 A vehicle-mounted atmospheric volatile organic compound detection device, comprising an air duct 1 and an air pump 2, the air duct 1 serves as the main channel for guiding the air sample into the device, the air duct 1 is fixed with the output end of the air pump 2, and the air pump 2 is responsible for extracting the external air sample and introducing it into the air duct 1. The air pump 2 has sufficient suction capacity to ensure the representativeness and flow stability of the sample, and further comprises: an ionization unit 3 fixedly installed in the air duct 1, used for converting volatile organic compounds in the air sample into charged ions; an adsorption unit 4 fixedly installed in the air duct 1 and connected with the ionization unit 3, used for capturing and enriching the charged ions; a data communication unit 5 used for transmitting monitoring data to external equipment or a cloud server.

[0029] When detection is required, the air pump 2 is started, which draws air samples from the outside and introduces them into the device through the air duct 1. When the air samples pass through the ionization unit 3, the neutral molecules in the air, including VOCs, are ionized to form charged ions. The charged VOC ions come into contact with the high-efficiency adsorbent material in the adsorption unit 4 and are captured. After a period of time, a large amount of low-concentration VOCs are enriched on the adsorbent material, forming a higher-concentration sample. The data collected by the adsorption unit 4 is transmitted to external devices or cloud servers through the data communication unit 5 for further processing and analysis. Users can view real-time monitoring data, receive alarm information, and manage device settings through the accompanying application.

[0030] It should be noted that in order to maintain long-term stable operation, the adsorbent material needs to be regenerated regularly. This is usually done by heating desorption, and then cooling back to the adsorption state, preparing for the next round of sampling.

[0031] The ionization unit 3 includes: a corona discharge ionizer 301 with positive and negative electrodes for generating high-voltage electrodes to ionize neutral molecules in the air; and an ion guide plate 302 for guiding charged ions to move towards the adsorption unit.

[0032] The corona discharge ionizer 301 has positive and negative electrodes, which generates corona discharge through high-voltage electrodes to ionize neutral molecules in the air, including VOCs, to form charged ions. The positive electrode is usually made of metal wire or fine metal needle, which can withstand high voltage without being easily damaged. The negative electrode can be a ring-shaped or other shaped metal plate, which maintains a proper distance from the positive electrode to ensure stable electric field distribution. A high-voltage power supply provides the required high voltage for the corona discharge ionizer 301 to ensure the effectiveness and stability of the ionization process. The ion guide plate 302 is located behind the corona discharge ionizer 301 to guide the movement of charged ions to the adsorption unit 4, avoiding ion loss. It is made of materials with good electrical conductivity, such as stainless steel or silver-plated copper plate, to ensure charge transmission efficiency. It is designed with a specific curved or grid structure to help evenly distribute the electric field, reduce charge accumulation, and improve ion transmission efficiency. High-strength insulating materials are used to support the ion guide plate 302 to prevent short circuits and ensure its stable operation in a high-voltage environment.

[0033] When the air sample enters the wind tunnel 1 and passes through the ionization unit 3, the high-voltage electrode generated by the corona discharge ionizer 301 ionizes the neutral molecules (including VOCs) in the air, forming charged ions. At this time, the strong electric field between the positive electrode and the negative electrode causes the molecules in the air to undergo collision ionization, generating a large number of charged ions, which are accelerated under the action of the electric field and move towards the ion guide plate 302. The ion guide plate 302 effectively guides the charged ions along the predetermined path by its special geometry and material properties, and finally enters the adsorption unit 4 for capture and enrichment. In order to further improve the ionization effect, a temperature control module 402 can be set near the corona discharge ionizer 301 to adjust the local temperature and promote the occurrence of ionization reaction. In addition, a small amount of oxygen or water vapor can also be introduced to enhance the ionization efficiency.

[0034] The adsorption unit 4 includes:

[0035] The enrichment film 401 is made of materials with high specific surface area, strong adsorption capacity and good electrical conductivity, such as modified activated carbon, molecular sieve or metal organic framework (MOFs). These materials have high affinity for VOCs and can effectively adsorb charged ions. They are designed in the form of thin film or fiber mesh to increase the contact area with charged ions and improve the adsorption efficiency. The enrichment film 401 can be directly attached to the surface of the negative electrode to ensure that the charged ions can be quickly captured. Since it is installed at the negative electrode, the enrichment film 401 has a negative charge, which further enhances the attraction to positively charged VOC ions and improves the selectivity and efficiency of adsorption.

[0036] The temperature control module 402 includes:

[0037] Heating element: such as resistance wire or heating sheet, installed near the enrichment film 401, which can raise the temperature when needed to regenerate or desorb the adsorption material;

[0038] Cooling device: such as heat sink or small fan, used to lower the temperature during adsorption to maintain the best adsorption conditions. The cooling device can also prevent the performance of the adsorption material from being degraded due to high temperature;

[0039] Temperature sensor: real-time monitoring of the working temperature of the adsorption material and feedback of the data to the control system for accurate adjustment of heating or cooling power.

[0040] When the charged ions pass through the corona discharge ionizer 301, the enrichment film 401 at the negative electrode is electrostatically attracted and quickly captured and enriched. At this time, the temperature control module 402 maintains a low-temperature environment through the cooling device, enhancing the adsorption effect and ensuring that more VOC ions are effectively captured. Over time, a large number of low-concentration VOCs are enriched on the enrichment film 401, forming a higher-concentration sample. During this period, the temperature control module 402 continuously monitors and maintains the optimal adsorption temperature, ensuring the stability and efficiency of the adsorption process. To maintain long-term stable operation, the enrichment film 401 needs to be regenerated regularly, usually by heating elements to raise the temperature, causing the adsorbent material to release the enriched VOCs for subsequent detection unit analysis. After that, the cooling device is used to restore the adsorption state, preparing for the next round of sampling.

[0041] The data communication unit 5 includes a wireless communication module, such as Wi-Fi, Bluetooth, or cellular network, for remote data transmission and command reception; a user interface, including a display screen or indicator light, providing intuitive operation feedback and status prompts.

[0042] The wireless communication module supports multiple wireless communication protocols to adapt to different application scenarios and technical requirements. Specifically:

[0043] Wi-Fi module: connects to the Internet or local area network through a wireless local area network (WLAN), enabling high-speed data transmission, suitable for situations requiring large amounts of data exchange;

[0044] Bluetooth module: provides short-range wireless communication capabilities, suitable for quick pairing and data transmission with mobile devices (such as smartphones and tablets), allowing users to view test results in real time;

[0045] Cellular network module (such as 4G / 5G): enables remote data transmission through mobile communication networks, particularly suitable for long-term outdoor use or areas far from fixed network coverage, ensuring real-time monitoring and data uploading.

[0046] The wireless communication module not only transmits monitoring data to external devices or cloud servers, but also supports receiving control instructions from remote terminals, such as starting / stopping sampling, adjusting parameters, etc., enabling remote management and maintenance of the system.

[0047] When the adsorption unit 4 completes enrichment and generates monitoring data, these data are first stored in the data processing unit. Subsequently, the wireless communication module transmits the data to an external device or a cloud server according to a preset transmission strategy (such as timed uploading or event-triggered uploading) for further analysis and archiving. A remote terminal (such as a PC or a smartphone application) can send control instructions to the vehicle-mounted atmospheric volatile organic compound detection device through the wireless communication module, such as adjusting the sampling frequency or changing the temperature setting. After receiving the command, the data processing unit will immediately perform the corresponding operation and provide feedback on the current state through the user interface. The user interface provides an intuitive operation platform for users, whether it is through the display screen to view detailed information or through the indicator light to obtain brief prompts, which can help users better understand and manage the detection process. Especially in outdoor or mobile environments, the design of the user interface takes into account ease of use and reliability, ensuring smooth operation even in adverse conditions.

[0048] The air cylinder 1 includes a pre-filtering bin 101 and a detection bin 102. The pre-filtering bin 101 is located at the front end of the air cylinder 1 and is used to preliminarily filter the air sample entering the system to remove large particles and other non-gaseous pollutants. A valve 6 is installed between the pre-filtering bin 101 and the detection bin 102. The ionization unit 3, the adsorption unit 4, and the data communication unit 5 are installed in the detection bin 102.

[0049] When the air pump 2 starts and extracts the external air sample, the air first passes through the filter screen or filter element in the pre-filtering bin 101 to remove large particles and other non-gaseous pollutants. This step not only protects the subsequent processing units but also improves the reliability of the final detection results. The pre-filtered air sample enters the detection bin 102 through the valve 6. The valve 6 can cut off the flow path when necessary to meet different operation requirements. After the air sample enters the detection bin 102, it successively passes through the ionization unit 3 and the adsorption unit 4. The ionization unit 3 converts the volatile organic compounds in the air sample into charged ions. Subsequently, these charged ions are captured and enriched by the adsorption unit 4.

[0050] A filter screen 7 is installed at the end of the pre-filtering bin 101 away from the detection bin 102. It is used to preliminarily filter the air sample entering the system to remove large particles and other non-gaseous pollutants, effectively capturing large particulate matter such as dust, pollen, and smoke. A filter membrane 8 is installed inside the pre-filtering bin 101 to further filter the air sample after passing through the filter screen 7, removing finer particles and some volatile organic compounds. A rotating shaft 9 is jointly installed between the filter screen 7 and the filter membrane 8. A impeller 10 is fixedly installed on the rotating shaft 9. The rotating shaft 9 is rotationally connected with the valve 6. When the air pump 2 extracts the air sample, the impeller 10 is driven to rotate, enhancing the flowability and uniform distribution of the airflow and improving the filtering efficiency. A first brush 11 is fixedly installed on the rotating shaft 9 and abuts against the filter membrane 8.

[0051] When the air pump 2 starts and extracts the external air sample, the air first passes through the filter screen 7 in the pre-filtering bin 101 to remove large particles and other non-gaseous pollutants, the impeller 10 is driven to rotate to enhance the flowability and uniform distribution of the air flow, and the treated air sample then passes through the filter membrane 8 to further remove finer particles and part of volatile organic compounds. In this process, the first brush 11 continuously wipes the surface of the filter membrane 8 with the rotation of the rotating shaft 9 to prevent fine particles from accumulating and maintain high filtration performance, and the pre-filtered air sample enters the detection bin 102 through the valve 6 for detection.

[0052] The pre-filtering bin 101 is fixedly provided with a mounting seat 12 for supporting the rotating shaft 9, and the rotating shaft 9 is movably provided with a spring 13, and the two ends of the spring 13 are respectively abutted with the mounting seat 12 and the valve 6. When the rotating shaft 9 is impacted or vibrated externally, the spring 13 can provide a certain buffer to protect the rotating shaft 9 and related components from being damaged.

[0053] Through the action of the spring 13, the proper contact pressure between the rotating shaft 9 and the valve 6 is maintained to ensure the sealing performance and smooth opening and closing of the valve 6. When the valve 6 is opened or closed, the spring 13 can help the rotating shaft 9 to quickly reset to ensure that the system returns to the normal working state.

[0054] The filter membrane 8 is slidably installed in the pre-filtering bin 101, and the filter membrane 8 is rotatably provided with a baffle 14 through an elastic element, preferably a torsion spring, and the pre-filtering bin 101 is provided with a dust falling port 103 matched with the baffle 14.

[0055] When the valve core of the valve 6 is opened, the rotating shaft 9 drives the filter membrane 8 to slide in the pre-filtering bin 101 by a certain distance, at this time, the baffle 14 tightly abuts the dust falling port 103, so that a relatively sealed environment is formed in the pre-filtering bin 101, and the first brush 11 wipes the dust on the filter membrane 8 to the baffle 14. When the air pump 2 is closed, the spring 13 drives the valve core to reset, and the baffle 14 resets together with the filter membrane 8 to allow the particles to be discharged through the dust falling port 103.

[0056] The baffle 14 is symmetrically provided with first protrusions 1401 on both sides, and the first protrusions 1401 are equidistantly arranged, and the pre-filtering bin 101 is fixedly provided with second protrusions 104 abutting with the first protrusions 1401.

[0057] When the baffle 14 resets, the first protrusions 1401 on the surface continuously contact the second protrusions 104 on the outer wall of the pre-filtering bin 101 to produce oscillation, thereby improving the particle discharge efficiency.

[0058] The end of the rotating shaft 9 away from the valve 6 penetrates out of the filter screen 7 and is fixedly provided with a second brush 15.

[0059] When the air pump 2 is working, the rotating shaft 9 drives the filter membrane 8 to slide in the pre-filter bin 101 by a distance, at this time, the second brush 15 abuts against the filter screen 7, and is used for wiping the particulate matter adhered to the surface of the filter screen 7, and improving the air intake efficiency.

[0060] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art, according to the technical scheme and the inventive concept of the present application, can make equivalent replacement or change within the technical range disclosed by the present application, and all of them should be covered within the protection scope of the present application.

Claims

1. A device for detecting atmospheric volatile organic compounds in a vehicle, comprising a wind tube (1) and a gas pump (2), the wind tube (1) being fixed with the output end of the gas pump (2), characterized in that, Also includes: Ionization unit (3) is fixedly installed in the air duct (1), for converting volatile organic compounds in air sample into charged ions; Adsorption unit (4) is fixedly installed in the air duct (1), connected with the ionization unit (3), for capturing and enriching the charged ions; Data communication unit (5) is used for transmitting monitoring data to external equipment or cloud server.

2. The device for detecting atmospheric volatile organic compounds according to claim 1, wherein The ionization unit (3) comprises: Corona discharge ionizer (301) is provided with positive electrode and negative electrode, for generating high voltage electrode to make neutral molecules in air ionize; Ion guide plate (302) is used for guiding the movement of charged ions to the adsorption unit (4).

3. The device according to claim 2, wherein The adsorption unit (4) comprises: Enrichment membrane (401) is installed at the negative electrode of the corona discharge ionizer (301); Temperature control module (402) is used for adjusting the working temperature of the adsorption material.

4. The device for detecting atmospheric volatile organic compounds according to claim 3, wherein The data communication unit (5) comprises: Wireless communication module, including one or more of Wi-Fi, Bluetooth or cellular network, for remote data transmission and command receiving; User interface, the user interface includes display screen or indicator light, provides intuitive operation feedback and state prompt.

5. The device according to claim 1 or 4, wherein The air duct (1) comprises pre-filter bin (101) and detection bin (102), the valve (6) is installed between the pre-filter bin (101) and the detection bin (102); Wherein, the ionization unit (3), adsorption unit (4) and data communication unit (5) are installed in the detection bin (102).

6. The device for detecting atmospheric volatile organic compounds according to claim 5, wherein The pre-filter bin (101) is installed with filter screen (7) away from one end of the detection bin (102), the pre-filter bin (101) is installed with filter membrane (8), the filter screen (7) and the filter membrane (8) are jointly installed with rotating shaft (9), the rotating shaft (9) is fixedly installed with impeller (10), the rotating shaft (9) is rotatably connected with the valve (6); Wherein, the rotating shaft (9) is fixedly installed with first brush (11), the first brush (11) is abutted with the filter membrane (8).

7. The device according to claim 6, wherein The pre-filter bin (101) is fixedly installed with mounting seat (12) for supporting the rotating shaft (9), the spring (13) is movably installed on the rotating shaft (9), the two ends of the spring (13) are respectively abutted with the mounting seat (12) and the valve (6).

8. The device according to claim 7, wherein The filter membrane (8) is slidably installed in the pre-filter bin (101), the filter membrane (8) is rotatably installed with baffle (14) on the filter membrane (8) through elastic member, the pre-filter bin (101) is provided with ash falling port (103) matched with the baffle (14).

9. The device according to claim 8, wherein The baffle (14) is symmetrically installed with first protrusion (1401) on both sides, the first protrusions (1401) are equidistantly arranged, the second protrusion (104) is fixedly installed on the outer wall of the pre-filter bin (101) and abutted with the first protrusion (1401).

10. The device according to claim 9, wherein The rotating shaft (9) penetrates out of the filter screen (7) and is fixedly installed with second brush (15) away from the valve (6).

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