Air detection device for indoor building materials

Abstract

The invention relates to the technical field of environment detection, and provides an air detection device for indoor building materials, which comprises a main sampling module for collecting samples and a treatment cabin fixedly connected with the sampling module, the sampling module comprises a vertically arranged sampling channel, a filter membrane clamping device arranged in the sampling channel and used for clamping a filter membrane and a power unit used for providing constant negative pressure, the treatment cabin is fixedly connected with the side wall of the sampling channel, and a sliding channel used for allowing the filter membrane clamping device to slide is arranged between the treatment cabin and the sampling channel; and a purging mechanism for drying the filter membrane is arranged in the treatment cabin. The device has the beneficial effects that after sampling is finished, the filter membrane holder is moved into the treatment cabin, and the purging mechanism in the treatment cabin purges and blows a filter membrane by using continuous dry low-flow-speed airflow to take away redundant moisture on the filter membrane, so that rapid, uniform and nondestructive drying of the filter membrane is realized, and the quality of the filter membrane is improved. The purposes of rapid detection, continuous monitoring and on-site evaluation are achieved.

Description

Technical Field

[0001] This invention relates to the technical field of environmental testing, and more specifically, to a device for detecting air quality in indoor building materials. Background Technology

[0002] During interior decoration or renovation, various building materials continuously release pollutants into the air, which has become one of the main factors affecting indoor air quality. These pollutants include not only widely concerned gaseous pollutants such as formaldehyde and volatile organic compounds, but also an equally important but often overlooked particulate matter from building materials floating in the air. This particulate matter mainly comes from the cutting, grinding, and installation processes of wood, gypsum, stone, etc., so accurate monitoring of this type of PM2.5 is necessary.

[0003] In monitoring the mass concentration of PM2.5 in ambient air, the filter membrane sampling-weighing method is currently the recognized benchmark method. However, under special conditions of high humidity, such as the humid spring weather in southern China, basements, or newly constructed damp rooms, the high humidity in the ambient air causes the filter membrane to adsorb a large amount of water vapor during sampling, resulting in a "false increase in mass" during weighing, which seriously affects the measurement accuracy. The traditional solution is to place the sampled filter membrane in a constant temperature and humidity chamber for 24 to 48 hours to equilibrate and allow the moisture to fully evaporate before weighing. Although this method can ensure accuracy, it is extremely time-consuming and cannot meet the needs of rapid detection, on-site assessment, or large-scale continuous monitoring. Therefore, a new technical solution is needed to address the above-mentioned technical problems. Summary of the Invention

[0004] This application proposes an indoor building material air quality testing device. After sampling, the filter membrane holder is moved into the processing chamber, and the filter membrane is swept away by a continuous dry low-velocity airflow using a purging mechanism in the processing chamber. This removes excess moisture from the filter membrane, achieving rapid, uniform, and non-destructive drying of the filter membrane while ensuring that the sampling airflow is not disturbed. This enables rapid detection, continuous monitoring, and on-site evaluation.

[0005] Therefore, this application provides an indoor building material air detection device, including a main sampling module for collecting samples and a processing chamber fixedly connected to the sampling module. The sampling module includes a vertically arranged sampling channel, a filter membrane holder disposed in the sampling channel for holding a filter membrane, and a power unit for providing constant negative pressure. The processing chamber is fixedly connected to the side wall of the sampling channel, and a sliding channel is provided between the two to allow the filter membrane holder to slide. A purging mechanism for drying the filter membrane is provided in the processing chamber.

[0006] By adopting the above technical solution: when using the air detection device, the power unit first uses a negative pressure state in the sampling channel, and then the indoor air containing or installed building materials enters the sampling channel. The air passes through the filter membrane on the filter membrane holder, and suspended particles, i.e. PM2.5, are impacted and remain on the filter membrane. After sampling is completed, the filter membrane holder is pushed through the sliding channel into the processing chamber. The purging structure in the processing chamber uses a low-speed airflow to purge the bottom of the filter membrane, so that the moisture on the filter membrane is carried away by the dry and clean airflow, achieving rapid, non-destructive, and uniform drying of the filter membrane, thus achieving the purpose of rapid detection, continuous monitoring, and on-site evaluation.

[0007] Preferably, the filter membrane holder is provided with a support frame for pushing the filter membrane holder to slide in the sliding channel, the filter membrane holder is engaged with the support frame, and a first driving member is provided between the support frame and the sampling channel for pushing the support frame to slide in the sliding channel.

[0008] By adopting the above technical solution: during the sampling stage, the filter membrane holder is supported by a support frame. After sampling is completed, the first driving component pushes the support frame to slide in the sliding channel, so that the support frame carries the filter membrane holder into the processing chamber. Since the filter membrane holder and the support frame are engaged, the filter membrane holder can be easily removed from the support frame and then a new filter membrane holder and filter membrane can be put in for the next test, reducing the installation time of the filter membrane in the sampling channel and further improving the test effect.

[0009] Preferably, a guide assembly is provided between the support frame and the sliding channel. The guide assembly includes a guide groove formed in the sliding channel and a guide bar fixedly connected to the support frame. The guide bar is located in the guide groove and is slidably connected to the guide groove.

[0010] By adopting the above technical solution: when the support frame slides in the sliding channel, the support frame drives the guide strip to slide along the guide groove, so that when the support frame slides from the sampling channel to the processing chamber, it is guided by the guide groove, making the sliding more stable.

[0011] Preferably, the support frame is fixedly connected to the two sides perpendicular to the guide bar with sealing plates for blocking the sliding channel.

[0012] By adopting the above technical solution: by setting two sealing plates, when the support frame drives the filter membrane holder to be located in the collection channel, the sealing plate on the side away from the first driving component abuts against the sliding channel at the position in the processing chamber, and the sealing plate blocks the sliding channel; when the first driving component pushes the support frame to slide to the processing chamber, the support frame drives the sealing plate on the side closer to the first driving component to block the sliding channel at the position in the sampling channel, thereby realizing that when the support frame moves between the sampling channel and the processing chamber, the sealing plate can be used to block the sliding channel, so that the sampling channel and the processing chamber are two independent sealed cavities.

[0013] Preferably, the filter membrane holder includes an inner ring and an outer ring, with the edge of the filter membrane sleeved on the outside of the inner ring and the outer ring sleeved on the outside of the inner ring, and the edge of the filter membrane clamped between the inner ring and the outer ring.

[0014] By adopting the above technical solution, the filter membrane holder is set as an inner ring and an outer ring, so that when the filter membrane holder drives the filter membrane to dry, the airflow directly passes through the filter membrane to dry the filter membrane evenly.

[0015] Preferably, the bottom end of the filter membrane is provided with a dynamic support mechanism for supporting the bottom end of the filter membrane. The dynamic support mechanism includes a support net for supporting the filter membrane and a sliding rod slidably disposed in the sampling channel. The sliding rod is fixedly connected to the support net and is connected to a second driving member for driving the sliding rod to slide. The second driving member is fixedly connected to the sampling channel.

[0016] By adopting the above technical solution: when the filter membrane holder moves the filter membrane to sample in the sampling channel, the second driving component drives the sliding rod to slide, and the sliding rod drives the support net to abut against the filter membrane. The support net supports the filter membrane, avoiding the collapse of the center of the filter membrane due to prolonged continuous negative pressure. After sampling is completed, the power source that generates negative pressure is turned off, and then the second driving component is activated to drive the support net to separate from the filter membrane through the sliding rod. At this time, the filter membrane holder can be pushed into the processing chamber by the support frame, and then the filter membrane is dried by a clean and dry purge airflow with a low flow rate. By setting the filter membrane holder composed of inner and outer rings and the dynamic support mechanism that matches the filter membrane holder in the sampling channel, the filter membrane can be supported when it needs support and can achieve 100% unobstructed flow when drying in the processing chamber requires unobstructed flow.

[0017] Preferably, the purging mechanism is located at the bottom of the filter membrane. The purging mechanism includes an air inlet pipe for conveying clean and dry gas into the treatment chamber and an air distribution plate for uniformly distributing the gas. The air distribution plate is fixedly connected to the treatment chamber and the air inlet pipe. A cavity communicating with the air inlet pipe is opened in the air distribution plate. An air outlet is opened at the end of the air distribution plate away from the air inlet pipe and communicates with the cavity.

[0018] By adopting the above technical solution: the air inlet pipe delivers clean and dry gas to the cavity of the air distribution plate, and then the gas flows from the cavity to the filter membrane through the air outlet. The filter membrane is swept by the dry and slow-flowing air, so that the moisture on the filter membrane is separated from the filter membrane along with the clean and dry air.

[0019] Preferably, the top of the processing chamber is provided with a heating plate for heating the filter membrane, and the heating plate is fixedly connected to the processing chamber.

[0020] By adopting the above technical solution, the environment in which the filter membrane is located is heated by setting a heating plate, which reduces the adsorption force between water and the filter membrane fiber. At the same time, the reverse airflow efficiently carries away the activated water molecules. This synergistic effect of "thermal loosening" and "airflow carrying" achieves an order-of-magnitude speed increase compared to simply letting it stand still.

[0021] Preferably, the top of the processing chamber is provided with an exhaust pipe for discharging gas and an electromagnetic control valve installed on the exhaust pipe, and the exhaust pipe is fixedly connected to the processing chamber.

[0022] By adopting the above technical solution: the airflow through the filter membrane is discharged from the treatment chamber through the exhaust pipe, and at the same time, the opening and closing of the exhaust pipe is controlled by the electromagnetic control valve to prevent the moisture in the surrounding environment from entering the treatment chamber through the exhaust pipe after the dried filter membrane is closed, so as to prevent the filter membrane from reabsorbing moisture after the treatment is completed in the treatment chamber.

[0023] Preferably, the side wall of the processing chamber is provided with a material inlet, and an opening and closing plate is provided at the material inlet. A snap-fit ​​structure for fixing the opening and closing plate is provided between the opening and closing plate and the processing chamber. The snap-fit ​​structure includes a fixing block fixedly connected to the processing chamber, a snap-fit ​​groove opened on the fixing block, and a snap-fit ​​strip fixedly connected to the opening and closing plate. The snap-fit ​​strip and the snap-fit ​​groove are snap-fitted together.

[0024] By adopting the above technical solution: after the filter membrane is dried, the opening and closing plate is moved to separate the snap strip from the snap groove, so that the opening and closing plate opens the material inlet. Then, the filter membrane holder and filter membrane in the processing chamber are taken out from the material inlet using tweezers or other tools. After the filter membrane is removed from the filter membrane holder, it is weighed as soon as possible to complete the rapid on-site detection of PM2.5.

[0025] The working principle and beneficial effects of this application are as follows: 1. By setting up a processing chamber and a purging mechanism, the air detection device first uses a power unit to create a negative pressure state in the sampling channel. Then, indoor air containing or installed building materials enters the sampling channel. The air passes through the filter membrane on the filter membrane holder, and suspended particles, i.e., PM2.5, are impacted and remain on the filter membrane. After sampling is completed, the filter membrane holder is pushed through the sliding channel into the processing chamber. The purging structure in the processing chamber uses a low-speed airflow to purge the bottom of the filter membrane, so that the moisture on the filter membrane is carried away by the dry and clean airflow. This achieves rapid, non-destructive, and uniform drying of the filter membrane, enabling rapid detection, continuous monitoring, and on-site assessment.

[0026] 2. By setting up a ring-shaped filter membrane holder and a dynamic support mechanism, when the filter membrane holder moves the filter membrane to sample in the sampling channel, the second driving component drives the sliding rod to slide. The sliding rod drives the support net to abut against the filter membrane, using the support net to support the filter membrane and avoid the center of the filter membrane from collapsing due to prolonged continuous negative pressure. After sampling is completed, the power source that generates negative pressure is turned off, and then the second driving component is activated to drive the support net to separate from the filter membrane through the sliding rod. At this time, the filter membrane holder can be pushed into the processing chamber by the support frame, and then the filter membrane is dried by a clean and dry purge airflow with a low flow rate. By setting up a filter membrane holder composed of inner and outer rings and a dynamic support mechanism that matches the filter membrane holder in the sampling channel, the filter membrane is supported when it needs support and achieves 100% unobstructed flow when it needs to be unobstructed during drying in the processing chamber.

[0027] 3. By setting up a purging mechanism and a heating plate, the heating plate heats the environment in which the filter membrane is located, reducing the adsorption force between water and the filter membrane fibers. At the same time, the reverse airflow efficiently carries away the activated water molecules. This synergistic effect of "thermal loosening" and "airflow carrying" achieves an order-of-magnitude speed increase compared to simply letting it stand still for equilibrium. Attached Figure Description

[0028] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 This is a schematic diagram of a device for detecting air quality in indoor building materials according to this application; Figure 2 This application shows a structural schematic diagram of the connection between the sampling channel and the processing chamber; Figure 3 This application shows a structural schematic diagram of the support frame structure; Figure 4 For this application Figure 3 A magnified view of part A in the middle; Figure 5 This application shows a structural schematic diagram of the sealing of the material inlet by the opening and closing plate.

[0030] The technical features in the attached drawings are labeled as follows: 1. Main sampling module; 11. Sampling channel; 12. Filter membrane holder; 121. Inner ring; 122. Outer ring; 13. Negative pressure pipe; 2. Processing chamber; 21. Feed port; 3. Support frame; 31. First driving component; 4. Guiding assembly; 41. Guiding groove; 42. Guiding strip; 5. Sealing plate; 6. Dynamic support mechanism; 61. Support net; 62. Sliding rod; 63. Second driving component; 7. Purging mechanism; 71. Air inlet pipe; 72. Air distribution plate; 721. Cavity; 722. Air outlet; 8. Heating plate; 9. Air outlet pipe; 91. Solenoid valve; 10. Opening and closing plate; 20. Snap-fit ​​structure; 201. Fixing block; 202. Snap-fit ​​groove; 203. Snap-fit ​​strip; 30. Purging air source. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1-2 As shown, this embodiment provides an indoor building material air quality testing device, including a main sampling module 1 for collecting samples and a processing chamber 2 fixedly connected to the sampling module. The sampling module includes a vertically arranged sampling channel 11, a filter membrane holder 12 disposed in the sampling channel 11 for holding the filter membrane, and a power unit for providing constant negative pressure. In this embodiment, a cyclone cutter is provided at the top of the sampling channel 11, and the power unit is preferably a vacuum pump. The vacuum pump is connected to the sampling channel 11 through a negative pressure pipe 13. The processing chamber 2 is fixedly connected to the side wall of the sampling channel 11, and a sliding channel is provided between the two to allow the filter membrane holder 12 to slide. A purging mechanism 7 for drying the filter membrane is provided in the processing chamber 2.

[0033] like Figures 2-4 As shown, the filter membrane holder 12 is provided with a support frame 3 for pushing the filter membrane holder 12 to slide in the sliding channel. The filter membrane holder 12 is engaged with the support frame 3. A first driving member 31 for pushing the support frame 3 to slide in the sliding channel is provided between the support frame 3 and the sampling channel 11. A guide assembly 4 is provided between the support frame 3 and the sliding channel. The guide assembly 4 includes a guide groove 41 opened in the sliding channel and a guide strip 42 fixedly connected to the support frame 3. The guide strip 42 is located in the guide groove 41 and is slidably connected to the guide groove 41. A sealing plate 5 for sealing the sliding channel is fixedly connected to the two sides of the support frame 3 perpendicular to the guide strip 42.

[0034] like Figures 3-4 As shown, the filter membrane holder 12 includes an inner ring 121 and an outer ring 122. The edge of the filter membrane is sleeved on the outside of the inner ring 121, and the outer ring 122 is sleeved on the outside of the inner ring 121. The edge of the filter membrane is clamped between the inner ring 121 and the outer ring 122. A dynamic support mechanism 6 is provided at the bottom of the filter membrane to support the bottom of the filter membrane. The dynamic support mechanism 6 includes a support net 61 for supporting the filter membrane and a sliding rod 62 slidably disposed in the sampling channel 11. The sliding rod 62 is fixedly connected to the support net 61. The sliding rod 62 is connected to a second driving member 63 for driving the sliding rod 62 to slide. The second driving member 63 is fixedly connected to the sampling channel 11. In this embodiment, in order to facilitate the display of the position of the support net 61, a plate-shaped structure with holes is used instead of the support net 61 to display the positional relationship and connection relationship.

[0035] like Figure 2 As shown, the purging mechanism 7 is located at the bottom of the filter membrane. The purging mechanism 7 includes an inlet pipe 71 for conveying clean and dry gas into the treatment chamber 2 and an air distribution plate 72 for uniformly distributing the gas. The air distribution plate 72 is fixedly connected to the treatment chamber 2 and the inlet pipe 71. A cavity 721 communicating with the inlet pipe 71 is opened in the air distribution plate 72. An outlet hole 722 is opened at the end of the air distribution plate 72 away from the inlet pipe 71. The outlet hole 722 is communicating with the cavity 721. A purging gas source 30 is provided at the end of the inlet pipe 71 away from the treatment chamber 2. In this embodiment, the purging gas source 30 is preferably a high-pressure gas cylinder. A primary pressure reducing valve and a secondary pressure regulating valve for controlling the gas pressure and a mass flow controller for accurately controlling the gas flow are provided on the inlet pipe 71.

[0036] like Figure 2 As shown, a heating plate 8 for heating the filter membrane is provided at the top of the processing chamber 2, and the heating plate 8 is fixedly connected to the processing chamber 2; an exhaust pipe 9 for discharging gas and an electromagnetic control valve are provided at the top of the processing chamber 2, and the exhaust pipe is fixedly connected to the processing chamber 2. In this embodiment, a temperature and humidity sensor for monitoring the temperature and humidity of the gas flow from the processing chamber 2 is provided at the exhaust pipe 9. The temperature and humidity sensor is connected to the control center, which is used to control the temperature of the heating plate 8 and the flow rate of the purge gas. For the convenience of those skilled in the art, the following preferred combination data are disclosed in this embodiment: the flow rate of the purge gas is controlled within the range of 0.1 L / min to 2 L / min by a mass flow controller, the heating temperature is controlled within the range of 40°C to 60°C, and the duration of combined drying is 5 minutes to 20 minutes.

[0037] like Figure 2 and Figure 5As shown, the side wall of the processing chamber 2 is provided with a material inlet 21, and an opening and closing plate 10 is provided at the material inlet 21. A snap-fit ​​structure 20 for fixing the opening and closing plate 10 is provided between the opening and closing plate 10 and the processing chamber 2. The snap-fit ​​structure 20 includes a fixing block 201 fixedly connected to the processing chamber 2, a snap-fit ​​groove 202 opened on the fixing block 201, and a snap-fit ​​strip 203 fixedly connected to the opening and closing plate 10. The snap-fit ​​strip 203 and the snap-fit ​​groove 202 are snap-fitted together.

[0038] The basic principle of this embodiment is as follows: First, the opening and closing plate 10 is opened to place the filter membrane holder 12 with the filter membrane installed into the support frame 3 located in the processing chamber 2. Then, the opening and closing plate 10 is sealed to the material inlet 21. Then, the first driving component 31 is activated to drive the support frame 3 to slide in the sliding channel, so that the support frame 3 drives the filter membrane holder 12 and the filter membrane to slide into the sampling channel 11. At this time, the support frame 3 drives the sealing plate 5 to block the sliding channel, so that the processing chamber 2 is isolated from the sampling channel 11. Then, the second driving component 63 is activated to drive the sliding rod 62 to slide a certain distance, so that the sliding rod 62 drives the support net 61 to abut against the filter membrane and support the filter membrane. After the preparation work is completed, the vacuum pump is started to make the sampling channel negative pressure through the negative pressure pipe 13. The airflow in the room enters the sampling channel 11 through the cyclone cutter, and then enters the negative pressure pipe 13 after passing through the filter membrane on the filter membrane holder 12. The floating particles in the airflow, namely PM2.5, are intercepted by the filter membrane.

[0039] After sampling for a certain period of time, the sampling ends and the vacuum pump stops working. Then, the second drive unit 63 is activated, which drives the support net 61 away from the filter membrane via the sliding rod 62. Then, the first drive unit 31 is activated, which drives the support frame 3 to slide into the processing chamber 2 from the sampling channel 11 through the sliding channel. When the support frame 3 drives the filter membrane holder 12 to fully enter the processing chamber 2, the support frame 3 drives the sealing plate 5 to seal the sliding channel, so that the processing chamber 2 module forms a sealed chamber. At the same time, the heating mechanism and the purge air source 30 are activated. The purge air source 30 enters the cavity 721 of the air distribution plate 72 after passing through the first-stage pressure reducing valve, the second-stage pressure regulating valve and the mass flow controller. Then, it flows evenly to the filter membrane from the air outlet 722. At this time, the top of the filter membrane is heated and the bottom is purged in reverse. The airflow that purges the filter membrane is discharged from the processing chamber 2 through the exhaust pipe.

[0040] When the temperature and humidity sensor on the exhaust pipe 9 detects that the humidity is lower than the set value, the solenoid valve 91 on the exhaust pipe 9 is closed first, and then the purge air source 30 is closed to maintain a certain positive pressure in the treatment chamber 2. This prevents external moisture from flowing directly into the treatment chamber 2 after the opening and closing plate 10 opens after the treatment chamber 2 cools down. Then, the opening and closing plate 10 is moved to separate the snap-fit ​​strip 203 from the snap-fit ​​groove 202. Using tweezers or other tools, the filter membrane holder 12 and the filter membrane in the treatment chamber 2 are taken out from the material inlet 21. After the filter membrane is removed from the filter membrane holder 12, it is weighed as soon as possible to complete the rapid on-site detection of PM2.5. This achieves rapid, uniform, and non-destructive drying of the filter membrane, enabling rapid detection, continuous monitoring, and on-site evaluation.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting air quality in indoor building materials, characterized in that, The sample includes a main sampling module (1) for collecting samples and a processing chamber (2) fixedly connected to the sampling module. The sampling module includes a vertically arranged sampling channel (11), a filter membrane holder (12) for holding the filter membrane in the sampling channel (11), and a power unit for providing constant negative pressure. The processing chamber (2) is fixedly connected to the side wall of the sampling channel (11), and a sliding channel is provided between the two to allow the filter membrane holder (12) to slide. A purging mechanism (7) for drying the filter membrane is provided in the processing chamber (2).

2. The indoor building material air quality detection device according to claim 1, characterized in that, The filter membrane holder (12) is provided with a support frame (3) for pushing the filter membrane holder (12) to slide in the sliding channel. The filter membrane holder (12) and the support frame (3) are engaged. A first driving member (31) for pushing the support frame (3) to slide in the sliding channel is provided between the support frame (3) and the sampling channel (11).

3. The indoor building material air quality detection device according to claim 2, characterized in that, A guide component (4) is provided between the support frame (3) and the sliding channel. The guide component (4) includes a guide groove (41) opened in the sliding channel and a guide strip (42) fixedly connected to the support frame (3). The guide strip (42) is located in the guide groove (41) and is slidably connected to the guide groove (41).

4. The indoor building material air quality detection device according to claim 3, characterized in that, The support frame (3) is fixedly connected to the two sides perpendicular to the guide strip (42) with sealing plates (5) for blocking the sliding channel.

5. The indoor building material air quality detection device according to claim 1, characterized in that, The filter membrane holder (12) includes an inner ring (121) and an outer ring (122). The edge of the filter membrane is sleeved on the outside of the inner ring (121), and the outer ring (122) is sleeved on the outside of the inner ring (121). The edge of the filter membrane is held between the inner ring (121) and the outer ring (122).

6. The indoor building material air quality detection device according to claim 5, characterized in that, The bottom end of the filter membrane is provided with a dynamic support mechanism (6) for supporting the bottom end of the filter membrane. The dynamic support mechanism (6) includes a support net (61) for supporting the filter membrane and a sliding rod (62) slidably disposed in the sampling channel (11). The sliding rod (62) is fixedly connected to the support net (61). The sliding rod (62) is connected to a second driving member (63) for driving the sliding rod (62) to slide. The second driving member (63) is fixedly connected to the sampling channel (11).

7. The indoor building material air quality detection device according to claim 1, characterized in that, The purging mechanism (7) is located at the bottom of the filter membrane. The purging mechanism (7) includes an air inlet pipe (71) for conveying clean and dry gas into the processing chamber (2) and an air distribution plate (72) for uniformly distributing the gas. The air distribution plate (72) is fixedly connected to the processing chamber (2) and fixedly connected to the air inlet pipe (71). A cavity (721) communicating with the air inlet pipe (71) is opened in the air distribution plate (72). An air outlet (722) is opened at one end of the air distribution plate (72) away from the air inlet pipe (71). The air outlet (722) is communicating with the cavity (721).

8. A device for detecting indoor building material air quality according to claim 7, characterized in that, The top of the processing chamber (2) is provided with a heating plate (8) for heating the filter membrane, and the heating plate (8) is fixedly connected to the processing chamber (2).

9. A device for detecting indoor building material air quality according to claim 8, characterized in that, The top of the processing chamber (2) is provided with an exhaust pipe (9) for discharging gas and an electromagnetic control valve provided on the exhaust pipe (9). The exhaust pipe is fixedly connected to the processing chamber (2).

10. A device for detecting indoor building material air quality according to claim 9, characterized in that, The processing chamber (2) has a material inlet (21) on its side wall. A door opening and closing plate (10) is provided at the material inlet (21). A snap-fit ​​structure (20) for fixing the door opening and closing plate (10) is provided between the door opening and closing plate (10) and the processing chamber (2). The snap-fit ​​structure (20) includes a fixing block (201) fixedly connected to the processing chamber (2), a snap-fit ​​groove (202) opened on the fixing block (201), and a snap-fit ​​strip (203) fixedly connected to the door opening and closing plate (10). The snap-fit ​​strip (203) is snap-fitted into the snap-fit ​​groove (202).

Images