Fresh air device with air quality management function

Abstract

The invention discloses a fresh air device with an air quality management function. A filter, a first air pump, a second air pump, a third air pump, a particle concentration detection module, a substance image recognition module, an indoor air pressure detection module and a controller are mounted in a mounting shell of the fresh air device. The controller electrically controls the filter, the first air pump, the second air pump and the third air pump to be intelligently matched according to detection data of the particle concentration detection module, the substance image recognition module and the indoor air pressure detection module, and therefore air is purified and adjusted. The fresh air device with the air quality management function is simple in structure, convenient to install, capable of conducting intelligent air purification adjustment according to actual requirements of users, diversified in purification function and more convenient to use.

Description

Technical Field

[0001] The invention relates to a fresh air device for purifying air. Background Art

[0002] Common household fresh air devices are to install the air filtration circulation system on the top ceiling of the house or inside other hard-installed facilities during hard decoration. When there is a lot of dust outside, the user can close all the doors and windows, and then turn on the air filtration circulation system to filter the dust from the outside air and input it into the house, thereby achieving the effect of air circulation and reducing dust. Such devices have a fixed installation structure, and are inconvenient to disassemble and repair. If you want to install and use them after decoration, the installation workload is huge. In addition, its air circulation processing function is single, and it cannot meet the diversified needs of users in specific living environments. For example, in the case of particulate matter that affects the user's respiratory tract in the air in the living area within a specific time period, and the climate conditions in a specific time period affect the user's breathing state, etc., the traditional fresh air device cannot meet the user's special needs for air quality. Summary of the invention

[0003] The present invention provides a fresh air device with air quality management function to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

[0004] A fresh air device with air quality management function, comprising: a mounting shell for fixing on the side of a window; the mounting shell is provided with:

[0005] Filter, used to filter the outside air entering the room;

[0006] A first air pump is connected to the air inlet end of the filter for drawing external air into the filter for filtering;

[0007] a second air pump connected to an air inlet end of the filter for drawing indoor air into the filter for filtering;

[0008] a third air pump connected to the air outlet of the filter for discharging the filtered air drawn in by the first air pump or the second air pump into the room;

[0009] A particle concentration detection module, used to detect the concentration of particulate matter in the air, and when the concentration of the particulate matter is detected to be greater than a preset value, control the first air pump, the filter and the third air pump to start;

[0010] A substance image recognition module, for performing image recognition on allergen substances that may cause allergies, and controlling the first air pump, the filter and the third air pump to turn on when the allergen substances that may cause allergies are detected;

[0011] An indoor air pressure detection module is used to detect the air pressure of the indoor air, and when the detected air pressure value is lower than a preset value, control the first air pump and the third air pump to start;

[0012] The controller is used to electrically control the filter, the first air pump, the second air pump and the third air pump according to the detection data of the particle concentration detection module, the material image recognition module and the indoor air pressure detection module.

[0013] Furthermore, the installation housing is also provided with:

[0014] A hazardous gas detection module, electrically connected to the controller, for detecting common hazardous gases or specific hazardous gases in the air;

[0015] The hazardous gas filtering module is electrically connected to the controller for filtering the hazardous gases in the air.

[0016] Furthermore, the hazardous gas filtering module includes: a liquid storage bottle detachably mounted on a mounting shell; a vent hole formed in the liquid storage bottle, one end of which is connected to the filter and the other end of which is connected to a third air pump; a plurality of sub-packaging units for storing different reaction liquids are arranged in the liquid storage bottle; a nozzle for spraying the corresponding reaction liquid is arranged at a position facing the vent hole of each sub-packaging unit.

[0017] Furthermore, a plurality of liquid filter layers corresponding to a plurality of subpackaging units respectively for filtering harmful gases from the air are sequentially arranged in a straight line direction in the vent hole; the nozzle is directed from the upper side of the liquid filter layer toward the liquid filter layer; a reflux hole for reflowing the reaction liquid is arranged below the liquid filter layer; the subpackaging unit is formed with a liquid outlet cavity located above and a reflux cavity located below; the reflux hole is connected to the reflux cavity; the nozzle is connected to the liquid outlet cavity; a reflux pump for pumping the reaction liquid in the reflux cavity into the liquid outlet cavity is arranged between the liquid outlet cavity and the reflux cavity.

[0018] Furthermore, the liquid filter layer has a plurality of interconnected liquid sprinkling holes formed inside it; the liquid filter layer has a plurality of air flow holes for air circulation formed on its left and right sides; the plurality of air flow holes located on one side of the liquid filter layer are connected to the plurality of liquid sprinkling holes, and are connected to the plurality of air flow holes located on the other side of the liquid filter layer through the plurality of liquid sprinkling holes.

[0019] Furthermore, a dry filter layer for filtering the reaction liquid after the reaction is detachably mounted at the other end of the vent hole.

[0020] Furthermore, the hazardous gas detection module includes: a detection test paper piece arranged between the hazardous gas filtering module and the filter; the air inlet end of the air hole formed in the detection test paper piece is connected to the filter and the air outlet end is connected to the hazardous gas filtering module; the detection test paper piece has a plurality of test paper units arranged in the circumferential direction of the air hole, each of which can react with the corresponding harmful gas; a monitoring camera for image recognition of the colors of the plurality of test paper units is installed at the end of the detection test paper piece; when the monitoring camera recognizes that the color of the corresponding test unit has changed, it controls the hazardous gas filtering module to start.

[0021] Furthermore, the first air pump and the third air pump are connected to a first pipeline and a second pipeline; the first pipeline is provided with a first control valve for controlling the air circulation in the first pipeline; the second pipeline is provided with a second control valve for controlling the air circulation in the second pipeline; one end of the second pipeline is connected to the filter; the air outlet end of the third air pump is connected to the second pipeline through the third control valve; the first control valve, the second control valve and the third control valve are all electrically connected to the controller.

[0022] Furthermore, tracks are installed on both sides of the installation shell, and a rolling shutter is installed at the bottom; a metal mesh for preventing mosquitoes and granular substances is rolled up on the outer periphery of the rolling shutter; connecting blocks are provided on both sides of the terminal end of the metal mesh; the two connecting blocks are respectively slidably connected to the corresponding tracks.

[0023] Furthermore, the filter, the test paper piece and the liquid storage bottle are all detachably installed in the installation shell through the installation slot; a mounting cover is provided on one side of the installation shell for opening the installation shell to replace the filter, the test paper piece and the liquid storage bottle.

[0024] The benefit of the present invention is that the fresh air device with air quality management function provided is simple in structure and easy to install. It can select the intelligent air purification and adjustment method according to the actual needs of the user. The purification and adjustment functions are diversified and more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 is a schematic diagram of a fresh air device with air quality management function of the present invention;

[0027] Figure 2 yes Figure 1A schematic diagram of the internal structure of a fresh air device with air quality management function;

[0028] Figure 3 yes Figure 2 A schematic diagram of the specific structure of the liquid storage bottle of the fresh air device with air quality management function;

[0029] A fresh air device 10 with air quality management function, a mounting shell 11, a mounting slot 111, a mounting cover 112, a filter 12, a first air pump 13, a second air pump 14, a third air pump 15, a liquid storage bottle 16, a vent 161, a packaging unit 162, a liquid outlet cavity 1621, a reflux cavity 1622, a reflux hole 1623, a nozzle 163, a reflux pump 164, a liquid filter layer 165, a liquid sprinkling hole 1651, an air flow hole 1652, a drying filter layer 166, a test paper 17, a test paper unit 171, a monitoring camera 18, a track 19, a rolling shutter 20, a metal mesh 21, a connecting block 22, a controller 23, an indoor air pressure detection module 24, a material image recognition module 25, a particle concentration detection module 26, a first control valve 27, a second control valve 28, a third control valve 29, a first pipeline 30, and a second pipeline 31. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0031] like Figures 1 to 3 As shown, a fresh air device 10 with air quality management function of the present application includes: a mounting shell 11. The mounting shell 11 can be directly installed as a whole with the window during the early stage of house construction, embedded in the wall, so as to be fixed to the side of the window, generally installed at the upper end of the window. The mounting shell 11 can also be added to the upper end of the window at a later stage after the house is built. At this time, it can be added and fixed to the wall at the upper end of the window, or the glass of the window can be cut and modified, so that it and the modified glass together constitute a part of the window. The installation structure is simple and the installation method is diversified. The installation position and installation time can be determined according to the actual needs of the user, which is more convenient.

[0032] The installation shell 11 is provided with: a filter 12, a first air pump 13, a second air pump 14, a third air pump 15, a particle concentration detection module 26, a material image recognition module 25, an indoor air pressure detection module 24 and a controller 23. Among them: the filter 12 is used to filter the outside air entering the room; the first air pump 13 is connected to the air inlet end of the filter 12 to draw the outside air into the filter 12 for filtering; the second air pump 14 is connected to the air inlet end of the filter 12 to draw the indoor air into the filter 12 for filtering; the third air pump 15 is connected to the air outlet end of the filter 12 to discharge the filtered air drawn in by the first air pump 13 or the second air pump 14 into the room; the particle concentration detection module 26 is used to detect the concentration of particulate matter in the air, and when it is detected that the concentration of particulate matter is greater than a preset value, the first air pump 13, the filter 12 and the third air pump 15 are controlled. The air pump 15 is turned on; the material image recognition module 25 is used to perform image recognition on allergen substances that may cause allergies, and when allergen substances that may cause allergies are detected, the first air pump 13, the filter 12 and the third air pump 15 are controlled to be turned on; the indoor air pressure detection module 24 is used to detect the air pressure of the indoor air, and when the detected air pressure value is lower than a preset value, the first air pump 13 and the third air pump 15 are controlled to be turned on; the controller 23 is used to electrically control the filter 12, the first air pump 13, the second air pump 14 and the third air pump 15 according to the detection data of the particle concentration detection module 26, the material image recognition module 25 and the indoor air pressure detection module 24.

[0033] Specifically, the first air pump 13 and the third air pump 15 are connected to a first pipeline 30 and a second pipeline 31. The first pipeline 30 is provided with a first control valve 27 for controlling the air circulation in the first pipeline 30, and the second pipeline 31 is provided with a second control valve 28 for controlling the air circulation in the second pipeline 31. One end of the second pipeline 31 is connected to the filter 12, and the air outlet end of the third air pump 15 is connected to the second pipeline 31 through the third control valve 29. The first control valve 27, the second control valve 28 and the third control valve 29 are all electrically connected to the controller 23.

[0034] That is to say, the indoor air pressure detection module 24, material image recognition module 25 and particle concentration detection module 26 of the fresh air device 10 with air quality management function are in a real-time detection state. When any one or more of the detection values ​​of the indoor air pressure detection module 24, material image recognition module 25 and particle concentration detection module 26 exceed the preset values, the user will be notified of the current air status through APP text messages, sound reminders, etc. The user will confirm whether to turn on the fresh air device 10 with air quality management function based on the detected air status. When the user turns on the fresh air device 10 with air quality management function, all windows in the house can be closed first. At this time:

[0035] If one of the material image recognition module 25 and the particle concentration detection module 26 detects a control quality problem or both detect a control quality problem, the controller 23 first controls the second air pump 14, the third control valve 29 and the third air pump 15 to start, and first circulates and purifies the air in the room. Then, the controller 23 controls the second air pump 14 and the third control valve 29 to start and stop, and controls the first air pump 13, the second control valve 28 and the third air pump 15 to start. At this time, the first control valve 27 is closed, so that the control outside the house is purified and filtered and discharged into the house. The air discharge flow rate here can be determined according to the air pressure in the house, that is, the air filtration and discharge control is performed through the detection value of the indoor air pressure detection module 24 and the preset air pressure value to ensure that the indoor air is fresh and the indoor air pressure is comfortable.

[0036] The controller 23 first controls the second air pump 14, the third control valve 29 and the third air pump 15 to start circulating and purifying the air in the room. The degree of end control can be achieved through time setting, or by setting a particle concentration detection module 26 and a material image recognition module 25 outside the installation shell 11 to monitor the air quality and end control. This solution is to control the circulation and purification of the air in the room through time setting.

[0037] If only the detection value of the indoor air pressure detection module 24 deviates from the preset value, and the control quality is not abnormal, the controller 23 controls the first air pump 13, the first control valve 27 and the third air pump 15 to start, and adjusts the air flow of the first air pump 13 and the first control valve 27 according to the preset air pressure value and the indoor air pressure value detected in real time by the indoor air pressure detection module 24, thereby realizing the regulation of the indoor air pressure and improving the user's breathing comfort.

[0038] APP text message sending, sound reminder device, etc. are structures attached to the fresh air device 10 with air quality management function. The specific structure and method are not limited in this solution.

[0039] The particle concentration detection module 26 is a PM2.5 detection module in the prior art. The material image recognition module 25 uses an image collector to collect high-definition images of the air flowing through, and the material image recognition module 25 also stores material image information that may cause allergies to the user (causing respiratory allergies, skin allergies, and other body allergies), such as pollen image information, catkins image information, etc. In this way, the material image recognition module 25 can accurately determine whether there are particulate substances in the air that may cause allergies by comparing and analyzing the image information of the air monitored in real time with the material image information in the memory.

[0040] The above-mentioned fresh air device 10 with air quality management function has a simple structure and is easy to install. Users can install it according to their own needs. The fresh air device 10 with air quality management function can also select intelligent air purification and adjustment methods according to the actual needs of users. The purification and adjustment functions are diversified and more convenient to use.

[0041] Furthermore, the installation shell 11 is also provided with: a hazardous gas detection module and a hazardous gas filtering module. The hazardous gas detection module can detect common hazardous gases or specific hazardous gases in the air, and then the hazardous gases in the air are filtered through the hazardous gas filtering module, thereby reducing the content of hazardous gases in the air and protecting the health of the user.

[0042] Specifically, the hazardous gas detection module includes: a test paper piece 17 disposed between the hazardous gas filtering module and the filter 12, and the test paper piece 17 is formed with pores. The air inlet end of the pore is connected to the filter 12, and the air outlet end is connected to the hazardous gas filtering module. The test paper piece 17 is arranged with a plurality of test paper units 171 in the circumferential direction of the pore, and the plurality of test paper units 171 can react with the corresponding harmful gases respectively, so as to judge the harmful gases contained in the air by detecting the color change of the test paper. A monitoring camera 18 is installed at the end of the test paper piece 17, and the monitoring camera 18 can perform image recognition on the colors of the plurality of test paper units 171, and when it is recognized that the color of the corresponding test unit has changed, the hazardous gas filtering module is controlled to start, so as to filter the air for harmful gases. In this way, the air can be intelligently detected, the targeted harmful gases can be accurately judged, and the user's physical safety can be protected in time.

[0043] Specifically, the above-mentioned hazardous gas filtering module includes: a liquid storage bottle 16. The liquid storage bottle 16 is detachably installed in the installation shell 11, which is easy to disassemble and replace. The liquid storage bottle 16 is formed with a vent hole 161, one end of the vent hole 161 is connected to the filter 12 and the other end is connected to the third air pump 15. A plurality of sub-packaging units 162 are arranged in the liquid storage bottle 16, and the plurality of sub-packaging units 162 are respectively used to store different reaction liquids. Each sub-packaging unit 162 is provided with a nozzle 163 facing the vent hole 161 for spraying out the corresponding reaction liquid. In this way, the corresponding harmful gases can be filtered through different reaction liquids. Chemical reaction filtration or water-soluble filtration can be used here.

[0044] The hazardous gas detection module of this solution is not limited to liquid filtration, and can also use a structure that has adsorption properties for the corresponding hazardous gases for physical filtration.

[0045] Furthermore, a plurality of liquid filter layers 165 are sequentially arranged in a straight line direction in the vent hole 161, and the plurality of liquid filter layers 165 correspond to the plurality of subpackaging units 162 respectively to filter harmful gases from the air. The corresponding nozzle 163 faces the liquid filter layer 165 from above, and a reflux hole 1623 is arranged below the liquid filter layer 165 for reflux of the reaction liquid sprayed from the nozzle 163. The subpackaging unit 162 is formed with a liquid outlet cavity 1621 located above and a reflux cavity 1622 located below, the reflux hole 1623 is connected to the reflux cavity 1622, the nozzle 163 is connected to the liquid outlet cavity 1621, and a reflux pump 164 is arranged between the liquid outlet cavity 1621 and the reflux cavity 1622, and the reaction liquid in the reflux cavity 1622 can be pumped into the liquid outlet cavity 1621 through the reflux pump 164. With such a structure, the reaction liquid in the dispensing unit 162 can be recycled, thereby improving the utilization rate of the reaction liquid and facilitating the cleaning and replacement of the reaction liquid.

[0046] As a further structure, the liquid filter layer 165 has a plurality of interconnected liquid dripping holes 1651 formed therein, and the liquid filter layer 165 has a plurality of air flow holes 1652 formed on its left and right sides, and the plurality of air flow holes 1652 located on one side of the liquid filter layer 165 are connected to the plurality of liquid dripping holes 1651, and are connected to the plurality of air flow holes 1652 located on the other side of the liquid filter layer 165 through the plurality of liquid dripping holes 1651. Such a structure can increase the contact time between air and reaction liquid, and improve the contact sufficiency between air and reaction liquid, thereby improving the purification quality.

[0047] As a further structure, a dry filter layer 166 is detachably installed at the other end of the vent hole 161, and the reaction liquid after the reaction can be filtered through the dry filter layer 166 to prevent the reaction liquid from entering the room along with the air.

[0048] For users living in areas with severe air pollution, especially near chemical parks and breeding areas, they can use the fresh air device 10 with air quality management function to purify the polluted air in a targeted and effective manner, thereby reducing the impact of polluted air on human health.

[0049] As a specific implementation, the filter 12, the test paper 17 and the liquid storage bottle 16 are all detachably installed in the installation housing 11 through the installation slot 111, and a mounting cover 112 is provided on one side of the installation housing 11 for opening the installation housing 11 to replace the filter 12, the test paper 17 and the liquid storage bottle 16. This makes it easy to replace and clean the internal filtering structure and the detection structure, and is convenient to use.

[0050] As a specific implementation, tracks 19 are installed on both sides of the installation housing 11, and a roller shutter 20 is installed below. A metal mesh 21 for preventing mosquitoes and granular substances is wound around the outer periphery of the roller shutter 20. The terminal of the metal mesh 21 is provided with connecting blocks 22 on both sides. When installing, the two connecting blocks 22 are respectively slidably connected to the corresponding tracks 19. In this way, when the fresh air device 10 with air quality management function is not used, the metal mesh 21 can achieve a simple function of preventing mosquitoes and granular substances, avoiding the installation of screen windows, and is very convenient to use.

[0051] Furthermore, the track 19 and the rolling shutter 20 can be detachably installed on the installation shell 11. Specifically, they can be detachably inserted through a groove buckle structure. The disassembly and installation are convenient. They can be directly removed when not needed and directly inserted when needed. If necessary, the installation structure of the track 19 and the rolling shutter 20 can be fixed by screws, non-stick adhesive and other structures on the basis of the inserted structure.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A fresh air device with air quality management function, characterized in that: include: An installation housing is used to be fixed to the side of the window; The installation housing is provided with: Filter, used to filter the outside air entering the room; a first air pump connected to the air inlet end of the filter for drawing external air into the filter for filtering; a second air pump connected to the air inlet end of the filter for drawing indoor air into the filter for filtering; a third air pump connected to the air outlet of the filter for discharging the filtered air drawn in by the first air pump or the second air pump into the room; A particle concentration detection module, used to detect the concentration of particulate matter in the air, and when the concentration of the particulate matter is detected to be greater than a preset value, control the first air pump, the filter and the third air pump to start; a substance image recognition module, for performing image recognition on allergen substances that may cause allergies, and controlling the first air pump, the filter and the third air pump to turn on when the allergen substances that may cause allergies are detected; An indoor air pressure detection module, used to detect the air pressure of the indoor air, and control the first air pump and the third air pump to start when the detected air pressure value is lower than a preset value; A controller is used to electrically control the filter, the first air pump, the second air pump and the third air pump according to the detection data of the particle concentration detection module, the material image recognition module and the indoor air pressure detection module.

2. The fresh air device with air quality management function according to claim 1 is characterized in that: The installation housing is also provided with: A hazardous gas detection module, electrically connected to the controller for detecting common hazardous gases or specific hazardous gases in the air; The hazardous gas filtering module is electrically connected to the controller for filtering the hazardous gases in the air.

3. The fresh air device with air quality management function according to claim 2 is characterized in that: The hazardous gas filtering module comprises: a liquid storage bottle detachably mounted on the mounting housing; The liquid storage bottle is formed with a vent hole having one end connected to the filter and the other end connected to the third air pump; The liquid storage bottle is provided with a plurality of sub-packaging units for storing different reaction liquids; Each of the dispensing units is provided with a nozzle for spraying the corresponding reaction liquid at a position facing the vent hole.

4. The fresh air device with air quality management function according to claim 3 is characterized in that: A plurality of liquid filter layers are sequentially arranged in a straight line direction in the vent hole, corresponding to the plurality of the subpackaging units respectively, to filter harmful gases from the air; The nozzle is directed toward the liquid filter layer from above the liquid filter layer; A reflux hole for refluxing the reaction liquid is provided below the liquid filter layer; The dispensing unit is formed with a liquid outlet cavity located at the top and a reflux cavity located at the bottom; The reflux hole is connected to the reflux cavity; The nozzle is connected to the liquid outlet cavity; A reflux pump for pumping the reaction liquid in the reflux chamber into the liquid outlet chamber is provided between the liquid outlet chamber and the reflux chamber.

5. The fresh air device with air quality management function according to claim 4 is characterized in that: The liquid filter layer has a plurality of interconnected liquid dripping holes formed therein; The liquid filter layer is formed with a plurality of air flow holes on the left and right sides thereof for air circulation; The plurality of air flow holes located on one side of the liquid filter mesh layer are connected to the plurality of liquid shower through holes, and are connected to the plurality of air flow holes located on the other side of the liquid filter mesh layer through the plurality of liquid shower through holes.

6. The fresh air device with air quality management function according to claim 3 is characterized in that: A dry filter layer for filtering the reaction liquid after the reaction is detachably mounted on the other end of the vent hole.

7. The fresh air device with air quality management function according to claim 2, characterized in that: The hazardous gas detection module comprises: a detection test paper disposed between the hazardous gas filtering module and the filter; The air holes formed on the test paper have an air inlet end connected to the filter and an air outlet end connected to the hazardous gas filtering module; The test paper piece has a plurality of test paper units arranged in the circumferential direction of the air hole, each of which can react with the corresponding harmful gas; A monitoring camera for image recognition of the colors of the plurality of test paper units is installed at the end of the test paper piece; When the monitoring camera recognizes that the color of the corresponding test unit changes, it controls the hazardous gas filtering module to start.

8. The fresh air device with air quality management function according to claim 1, characterized in that: The first air pump and the third air pump are connected with a first pipeline and a second pipeline; The first pipeline is provided with a first control valve for controlling the air circulation in the first pipeline; The second pipeline is provided with a second control valve for controlling the air circulation in the second pipeline; One end of the second pipeline is connected to the filter; The air outlet of the third air pump is connected to the second pipeline through a third control valve; The first control valve, the second control valve and the third control valve are all electrically connected to the controller.

9. The fresh air device with air quality management function according to claim 1, characterized in that: Tracks are installed on both sides of the installation shell, and a rolling shutter is installed at the bottom; The outer periphery of the rolling shutter is provided with a metal mesh for preventing mosquitoes and granular substances; The terminal end of the metal mesh is provided with connecting blocks on both sides; The two connection blocks are respectively slidably connected to the corresponding rails.

10. The fresh air device with air quality management function according to claim 1, characterized in that: The filter, the test paper and the liquid storage bottle are all detachably mounted in the mounting housing through mounting slots; A mounting cover for opening the mounting shell to replace the filter, the test paper and the liquid storage bottle is provided on one side of the mounting shell.

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