Indoor waste gas detection device

Abstract

An indoor waste gas detection device disclosed by the present invention comprises a detection box, the detection box is internally provided with a detection element and an exhaust funnel, the bottom of the exhaust funnel is sequentially provided with an airflow trend assembly and a processing mechanism, an air inlet fan sucks indoor air from a top grid through negative pressure, and the indoor air is stably conveyed to the exhaust funnel after primary filtration. A built-in multi-sensor array synchronously detects gas components, data are uploaded to a main control chip for analysis in real time, when the concentration of pollutants does not exceed the standard, a control column rotates to enable a gas flow groove to be aligned with an exhaust connecting pipe, gas is directly exhausted, once formaldehyde or TVOC and the like are recognized to exceed the standard, the control column switches a channel, and activated carbon preferentially captures organic pollutants in an adsorption box, so that the adsorption effect is achieved. And then the gas rises to the spraying area, atomized liquid drops sprayed by the water storage cover dissolve residual acidic substances and soluble organic matters, purified clean air is discharged from the side wall, and spraying wastewater is precipitated and then sent back to the water storage cover by a circulating pump to realize liquid reuse.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas detection technology, specifically to an indoor exhaust gas detection device. Background Technology

[0002] Indoor exhaust gas detection devices are electronic devices used to monitor and analyze the composition and concentration of specific harmful gases in indoor air in real time. Their core function is to protect the health and safety of people indoors. They actively collect ambient air samples through built-in high-sensitivity sensors and identify and quantify target pollutants. In daily life and work, these devices are mainly used to detect lethal exhaust gases such as carbon monoxide produced by incomplete combustion, as well as asphyxiating gases such as carbon dioxide that accumulate due to poor ventilation. They can also monitor health hazards such as formaldehyde, benzene, and volatile organic compounds that evaporate from building materials, furniture, or cleaning agents. Once the concentration of these harmful gases exceeds the preset safety threshold, the device will immediately issue a strong warning through audible and visual alarms, reminding people to take emergency measures such as shutting off the gas source, turning on ventilation, or evacuating quickly. This effectively prevents safety accidents such as poisoning, suffocation, and explosions, ultimately providing a crucial early warning and safety barrier for enclosed spaces such as residences, offices, factories, and garages.

[0003] In the prior art, publication number "CN118275420B" discloses an exhaust gas detection device and its detection method for exhaust gas treatment, relating to the field of exhaust gas detection. The device includes a base and an exhaust gas collection pipe. The exhaust gas collection pipe is positioned above the base to collect treated exhaust gas. An exhaust gas storage chamber is installed above the base to collect the exhaust gas, and the left end of the storage chamber is connected to the collection pipe, allowing the collection pipe to deliver gas into the storage chamber. A gas extraction mechanism is installed inside the storage chamber to draw gas from the collection pipe into the storage chamber. This exhaust gas detection device for exhaust gas treatment achieves quantitative collection of the gas through the movement of a piston within the storage chamber, combined with a first unidirectional flow mechanism, thus making subsequent detection data more comparable. When the piston is pushed to exhaust gas, a second unidirectional flow mechanism ensures that the gas smoothly enters the detection chamber for detection, making it convenient to use.

[0004] However, existing technologies still have significant shortcomings, such as: Traditional indoor exhaust gas detection devices generally suffer from the drawback of limited functionality and lack of intelligent airflow scheduling capabilities, resulting in continuous high energy consumption of the purification system. Furthermore, single adsorption technology cannot handle water-soluble pollutants and is prone to failure due to saturation. In addition, maintenance costs are high and there is a risk of secondary pollution. Summary of the Invention

[0005] The purpose of this invention is to provide an indoor exhaust gas detection device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an indoor exhaust gas detection device, comprising a detection box, wherein the detection box contains a detection element and an exhaust funnel, and the bottom of the exhaust funnel is provided with an airflow direction component and a processing mechanism in sequence; The airflow direction component includes an airflow cylinder, which has an air inlet pipe, an exhaust pipe and a control column built into it. The processing mechanism includes an adsorption box and a water storage cover, with the water storage cover located near the top surface of the adsorption box.

[0007] Preferably, the top surface of the detection box is provided with an air intake grille, which can filter the incoming gas.

[0008] Preferably, the inner wall of the detection box is fixed with a mounting cover, and the mounting cover is located near the bottom of the air intake grille, and the exhaust funnel is fixed with the bottom bolts during installation. An air intake fan is provided inside the mounting cover.

[0009] Preferably, the air inlet pipe is located at the bottom outlet of the airflow cylinder and connected to the top interface of the adsorption box, the exhaust pipe is located on the surface of the airflow cylinder and extends to the outside of the detection box, and one end of the airflow pipe is connected to an exhaust head.

[0010] Preferably, the airflow cylinder is located at the bottom outlet of the exhaust funnel and the two are sealed together, and the control column is located inside the interface on the surface of the airflow cylinder, and the two are movably connected and sealed to each other.

[0011] Preferably, an airflow groove runs through the center of the control column, and the airflow groove can be connected to the exhaust pipe and the intake pipe in sequence after rotation.

[0012] Preferably, each end of the control column is fitted with a connecting seat, and the connecting seat is fitted to the inner wall of the detection box and fixed with bolts, so as to realize the installation and limiting of the control column.

[0013] Preferably, the bottom of the adsorption box is provided with a base, and an adsorption plate is installed in an array inside the adsorption box, and activated carbon can be placed on the adsorption plate.

[0014] Preferably, the testing box has purification and exhaust vents on both the front and back, and the water storage cover has nozzles arranged in a circumferential array at the bottom, with the water storage cover located below the purification and exhaust vents.

[0015] Preferably, the bottom of the water storage hood is provided with a circulation pipe, one end of which is connected to the interface of the water storage hood, and the other end is close to the bottom surface inside the test box.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. Through multi-sensor fusion detection and intelligent airflow control, precise and efficient indoor exhaust gas monitoring is achieved. The independent airflow direction component is driven by a motor to rotate the control column and precisely switch the airflow channel. When the detection indicators are normal, the airflow channel is directly connected to the exhaust pipe for rapid discharge. When the parameters exceed the standard, it immediately switches to the purification channel. This automatic flow guidance mechanism based on real-time data not only avoids the ineffective operation of the treatment mechanism, but also ensures that polluted gas is introduced into the purification system in time, which significantly improves the detection response speed and overall energy efficiency.

[0017] 2. The system adopts a two-stage purification structure that combines activated carbon adsorption and atomized spraying to form a synergistic treatment with complementary advantages. The pre-activated carbon unit is specifically designed to adsorb non-water-soluble organic waste gas and odorous substances, while the post-atomized spraying system effectively treats water-soluble inorganic waste gas and some organic matter, while also cooling and removing dust. The recycling design of the spray liquid significantly reduces operation and maintenance costs and water consumption. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall device of the present invention; Figure 2 This is a perspective view of the device of the present invention; Figure 3 This is a front view of the device of the present invention; Figure 4 This is a cross-sectional view of the device of the present invention; Figure 5 This is a top view of the device of the present invention; Figure 6 This is a schematic diagram of the internal structure of the detection box in this invention; Figure 7 for Figure 6 Enlarged view of the airflow direction component; Figure 8 This is a schematic diagram of the airflow direction and exhaust in this invention.

[0019] In the diagram: 1. Inspection box; 11. Air intake grille; 12. Mounting cover; 13. Air intake fan; 2. Detection element; 3. Exhaust funnel; 4. Airflow direction assembly; 41. Airflow tube; 42. Inlet pipe; 43. Exhaust pipe; 44. Exhaust head; 45. Control column; 46. Airflow slot; 47. Connecting seat; 5. Processing mechanism; 51. Adsorption box; 52. Adsorption plate; 53. Base; 54. Water storage cover; 55. Spray nozzle; 56. Circulation pipe; 57. Purification exhaust port. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-8 The present invention provides a technical solution: Example 1: An indoor exhaust gas detection device: Includes a detection box 1, which is the outer shell of the indoor exhaust gas detection device. It houses an airflow direction component 4 and a processing mechanism 5. The airflow direction component 4 controls the gas flow inside the detection box 1, allowing the gas to be directly discharged or to enter the processing mechanism 5 for purification. The front of the detection box 1 includes a control panel for user control. The control panel, as the core of the human-machine interface, combines touch sensing and physical buttons. A built-in MCU main control chip analyzes user commands in real time. The purification fan speed is adjusted via a capacitive touch slider, and a membrane switch enables mode switching, such as detection, purification, and standby. An OLED screen dynamically displays PM2.5, formaldehyde, and TVOC concentration values ​​and historical curves. A short press of the power button activates the rapid detection mode, and a long press for 3 seconds enters the purification linkage state. All operation commands are transmitted to each execution unit via a CAN bus. The bottom of the detection box 1 can be equipped with casters for easy movement into the room and to a suitable location for operation.

[0022] The top surface of the testing chamber 1 is equipped with an air intake grille 11, which filters the incoming gas. An installation cover 12 is fixed to the inner wall of the testing chamber 1, located near the bottom of the air intake grille 11. An exhaust funnel 3 is fixed to the bottom bolts during installation. An air intake fan 13 is located inside the installation cover 12. An airflow guiding component 4 and a processing mechanism 5 are sequentially arranged at the bottom of the exhaust funnel 3. It is worth noting that the top of the testing chamber 1 includes the air intake grille 11. The gas inside is drawn into the testing chamber 1 through the air intake grille 11. The air intake grille 11 effectively filters the incoming gas. The incoming gas is filtered to prevent particulate impurities from entering the device and causing blockages in internal components. The intake fan 13 is located on the inner wall of the mounting cover 12, which connects the intake fan to the detection chamber 1, forming a whole. The intake fan 13 is driven by a DC brushless motor to rotate the centrifugal impeller at high speed, creating a negative pressure zone inside the mounting cover 12. This forces external gas to be drawn in from the intake grille 11 under atmospheric pressure. The airflow is accelerated by the impeller and generates directional flow kinetic energy, penetrating the primary filter screen and entering the detection chamber. This process uses PWM speed regulation of the motor to precisely control the airflow, ensuring that the sampled gas passes stably through the sensor reaction area and effectively blocks large particulate impurities such as hair.

[0023] The detection chamber 1 contains a detection element 2 and an exhaust funnel 3. The exhaust funnel 3 is funnel-shaped, which accelerates and evenly distributes the airflow as it passes through the detection element 2, effectively improving the sensor's response speed and measurement consistency. The detection element 2 is installed on its inner wall and can be used to detect and analyze the components in the passing gas. The electrochemical sensor generates a current signal through an oxidation-reduction reaction at the gas diffusion electrode. The metal oxide semiconductor sensor utilizes the resistance change after the target gas is adsorbed by the gas-sensitive material. The infrared sensor quantitatively analyzes the gas concentration based on the absorption intensity at a specific wavelength. All sensor data are processed by a temperature compensation algorithm and a multiple linear regression model to achieve simultaneous detection and cross-validation of pollutants such as formaldehyde, TVOC, and carbon dioxide at the ppm level.

[0024] Based on the test results, the airflow direction component 4 selects whether the incoming gas is directly discharged or enters the treatment mechanism 5 for purification. For example, when the tested gas does not contain excessive levels of formaldehyde, carbon dioxide, or other resins, the system can control the gas to be directly discharged from the test chamber 1. However, when a certain parameter in the gas exceeds the standard, the gas flow direction can be changed so that it passes through the treatment mechanism 5 for purification. The airflow direction component 4 includes an airflow cylinder 41, which has an inlet pipe 42, an exhaust pipe 43, and a control column 45. The inlet pipe 42 is located at the bottom outlet of the airflow cylinder 41 and is connected to the top interface of the adsorption box 51. The exhaust pipe 43 is located on the surface of the airflow cylinder 41 and extends to the outside of the test chamber 1. One end of the airflow pipe is connected to an exhaust head 44. The airflow cylinder 41 is located at the bottom outlet of the exhaust funnel 3, and the two are sealed together. The control column 45 is located inside the interface on the surface of the airflow cylinder 41, and the two are movably connected and sealed to each other. An airflow groove 46 runs through the center of the airflow path assembly 4, and after rotation, the airflow groove 46 can connect sequentially with the exhaust pipe 43 and the intake pipe 42. Specifically, the airflow cylinder 41 in the airflow path assembly 4 is located at the outlet of the exhaust funnel 3 and the two are sealed together. At the same time, the exhaust pipe 43 runs through the surface of the airflow cylinder 41 and is located on its side. The intake pipe 42 is located at the bottom outlet of the airflow cylinder 41. A control column 45 is installed between the two. The control column 45 also runs through the surface of the airflow cylinder 41 and can be movably connected to it and dynamically sealed. The two pipes and the surface of the control column 45 are matched so as not to affect the rotation of the control column 45 and to ensure that the control column 45 can fit with the two pipes when rotating. The airflow groove 46 runs through the center of the control column 45, and the rotation of the control column 45 can be controlled so that the airflow groove 46 is aligned and fitted with the intake pipe 42 or the exhaust pipe 43 to achieve connection. When connected to one pipe, the other pipe is in a closed state.

[0025] Example 2: Based on Embodiment 1, connecting seats 47 are respectively sleeved at both ends of the control column 45, and the connecting seats 47 are fitted to the inner wall of the detection box 1 and fixed with bolts to realize the installation and limiting of the control column 45. In order to ensure the stability of the control column 45, connecting seats 47 are added to connect it to the inner wall of the detection box 1. At the same time, sprockets and chains can be added, and the rotation of the control column 45 can be controlled under the drive of the motor. The airflow groove 46 is selected to connect with the required pipe.

[0026] The treatment mechanism 5 includes an adsorption box 51 and a water storage cover 54. The water storage cover 54 is located near the top surface of the adsorption box 51. The bottom of the adsorption box 51 is provided with a base 53. Adsorption plates 52 are arrayed inside the adsorption box 51, and activated carbon can be placed on the adsorption plates 52. The treatment structure is mainly divided into two parts: activated carbon adsorption purification and atomized spray treatment. The adsorption box 51 is limited and installed by the base 53. The adsorption plates 52 are built inside, and the required activated carbon can be placed on the adsorption plates 52 for adsorption and purification of the passing gas. Later, the detection box 1 can be opened, the adsorption box 51 can be taken out, the bottom cover with threads at the bottom can be removed, and the adsorption plates 52 inside can be taken out one by one to replace the activated carbon.

[0027] The front and back of the detection chamber 1 are equipped with purification exhaust ports 57. A water storage hood 54 has nozzles 55 arranged in a circular array at its bottom, and is located below the purification exhaust ports 57. A circulation pipe 56 is located at the bottom of the water storage hood 54, with one end connected to the interface of the water storage hood 54 and the other end close to the bottom surface inside the detection chamber 1. Further, the water storage hood 54 is fixed near the top surface of the adsorption chamber 51. The water storage hood 54 is used to store liquid. After the adsorbed and purified gas is discharged from the bottom of the adsorption chamber 51, it floats upwards. At this point, a secondary treatment can be performed on the gas using spraying. This treatment is mainly responsible for handling water-soluble inorganic waste gas and some other waste gases. The system effectively cools and removes dust from the air. The treated gas is discharged into the room through the purification exhaust holes 57 on both sides of the detection box 1, while the sprayed liquid falls into the bottom of the detection box 1. It can be pumped back into the water storage hood 54 through the circulation pipe 56 and water pump, thus achieving the effect of recycling. The system adopts a two-stage purification structure that combines activated carbon adsorption and atomized spraying to form a synergistic treatment with complementary advantages. The pre-activated carbon unit is specifically designed to adsorb non-water-soluble organic waste gas and odorous substances, while the post-atomized spraying system effectively treats water-soluble inorganic waste gas and some organic matter, while also cooling and removing dust. The recycling design of the spray liquid greatly reduces operation and maintenance costs and water consumption.

[0028] The intake fan 13 draws indoor air in from the top grille through negative pressure, and after initial filtration, it is stably delivered to the exhaust funnel 3. The built-in multi-sensor array synchronously detects the gas composition, and the data is uploaded to the main control chip for analysis in real time. When the pollutant concentration does not exceed the standard, the control column 45 rotates to align the airflow channel 46 with the exhaust pipe 43, and the gas is directly discharged. Once formaldehyde or TVOC exceeding the standard is detected, the motor drives the control column 45 to switch the path, so that the airflow channel 46 connects to the bottom intake pipe 42, and the polluted gas is forced into the treatment mechanism 5. In the adsorption box 51, activated carbon preferentially captures organic pollutants, and then the gas rises to the spray area. The atomized droplets sprayed by the water storage hood 54 dissolve residual acidic substances and soluble organic matter. The purified clean air is discharged from the side wall, while the spray wastewater is returned to the water storage hood 54 by the circulating pump after sedimentation to achieve liquid reuse. The whole process realizes intelligent air treatment through the closed-loop logic of detection, judgment, diversion and purification.

[0029] Working Principle: The detection box 1 is the outer shell of the indoor exhaust gas detection device, which contains an airflow direction component 4 and a processing mechanism 5. The airflow direction component 4 controls the gas flow inside the detection box 1, allowing the gas to be discharged directly or enter the processing mechanism 5 for purification. The front of the detection box 1 includes a control panel for user control of the device. The control panel serves as the core of human-machine interaction, employing a combination of touch sensing and physical buttons. The built-in MCU main control chip analyzes user commands in real time. The purification fan speed is adjusted via a capacitive touch slider, and the membrane switch enables mode switching, such as detection, purification, and standby. The OLED screen dynamically displays PM2.5, formaldehyde, and TVOC concentration values ​​and historical curves. A short press of the power button activates the rapid detection mode, while a long press for 3 seconds enters the purification linkage state. All operation commands are transmitted to each execution unit via the CAN bus. Additionally, the bottom of the detection box 1 can be equipped with casters, making it easy for users to push the detection box 1 into the room and move it to a suitable location for operation.

[0030] It is worth noting that the top of the detection chamber 1 includes an air intake grille 11. The gas inside is drawn into the detection chamber 1 through the air intake grille 11. The air intake grille 11 can effectively filter the incoming gas, preventing particulate impurities from entering the device and causing problems such as blockage of internal components. The air intake fan 13 is located on the inner wall of the mounting cover 12. The mounting cover 12 can be used to connect the air intake fan to the detection chamber 1, thus forming a whole. The air intake fan 13 is driven by a DC brushless motor to rotate the centrifugal impeller at high speed, creating a negative pressure zone inside the mounting cover 12. This forces the external gas to be drawn in through the air intake grille 11 under atmospheric pressure. After the airflow is accelerated by the impeller, it generates directional flow kinetic energy, penetrates the primary filter of the grille, and enters the detection chamber. This process uses PWM speed regulation of the motor to precisely control the airflow, ensuring that the sampled gas passes stably through the sensor reaction area and effectively blocks large particulate impurities such as hair.

[0031] The exhaust funnel 3 is funnel-shaped. This funnel structure accelerates and evenly distributes the airflow as it passes through the detection element 2, effectively improving sensor response speed and measurement consistency. The detection element 2 is installed on its inner wall to detect and analyze the components in the passing gas. The electrochemical sensor generates a current signal through a redox reaction at the gas diffusion electrode. The metal oxide semiconductor sensor utilizes the resistance change after the target gas is adsorbed by the gas-sensitive material. The infrared sensor quantitatively analyzes the gas concentration based on the absorption intensity at a specific wavelength. All sensor data are processed by a temperature compensation algorithm and a multiple linear regression model, ultimately achieving simultaneous detection and cross-validation of pollutants such as formaldehyde, TVOC, and carbon dioxide at ppm level accuracy. Based on the detection results, the airflow direction component 4 selects whether the incoming gas is directly discharged or enters the treatment unit 5 for purification. For example, when the detected gas does not contain excessive levels of formaldehyde, carbon dioxide, or other resins, the system can control the gas to be directly discharged from the detection chamber 1. However, when a certain parameter in the gas exceeds the standard, the gas flow direction can be changed, causing it to pass through… The air is purified by the treatment mechanism 5. Specifically, the airflow tube 41 in the airflow direction assembly 4 is located at the outlet of the exhaust funnel 3 and the two are sealed together. At the same time, the exhaust pipe 43 extends through the surface of the airflow tube 41 and is located on its side. The air inlet pipe 42 is located at the bottom outlet of the airflow tube 41. A control column 45 is installed between the two. The control column 45 also extends through the surface of the airflow tube 41 and can be movably connected to it, and a dynamic seal is formed. The pipes and the surface of the control column 45 are matched, so as not to affect the rotation of the control column 45 and to ensure that the control column 45 can rotate freely. The control column 45 is fitted with two connecting pipes. An airflow groove 46 runs through the center of the control column 45, which can be rotated to align the airflow groove 46 with the intake pipe 42 or the exhaust pipe 43 to achieve connection. When connected to one pipe, the other pipe is in a closed state. To ensure the stability of the control column 45, a connecting seat 47 is added to connect it to the inner wall of the detection box 1. At the same time, a sprocket and chain can be added, and the rotation of the control column 45 can be controlled by the motor to select the connection between the airflow groove 46 and the required pipe.

[0032] The treatment structure is mainly divided into two parts: activated carbon adsorption purification and atomized spray treatment. It includes an adsorption box 51, which is fixed by a base 53. The adsorption box 51 contains an adsorption plate 52 on which activated carbon can be placed to adsorb and purify the passing gas. Later, the detection box 1 can be opened, the adsorption box 51 removed, and the bottom cover with threads removed to replace the activated carbon in the adsorption plates 52. Further, a water storage hood 54 is fixed near the top surface of the adsorption box 51. The water storage hood 54 stores liquid. After the adsorbed and purified gas is discharged from the bottom of the adsorption box 51, it floats upwards. At this point, spray treatment can perform secondary treatment on the gas, mainly treating water-soluble inorganic waste gas and some organic matter, and effectively cooling and removing dust. The treated gas is discharged into the room through the purification exhaust holes 57 on both sides of the detection box 1, while the sprayed liquid falls to the bottom of the detection box 1. Through the circulation pipe 56 and a water pump, it can be drawn back into the water storage hood 54, thus achieving a recycling effect.

[0033] The intake fan 13 draws indoor air in from the top grille through negative pressure, and after initial filtration, it is stably delivered to the exhaust funnel 3. The built-in multi-sensor array synchronously detects the gas composition, and the data is uploaded to the main control chip for analysis in real time. When the pollutant concentration does not exceed the standard, the control column 45 rotates to align the airflow channel 46 with the exhaust pipe 43, and the gas is directly discharged. Once formaldehyde or TVOC exceeding the standard is detected, the motor drives the control column 45 to switch the path, so that the airflow channel 46 connects to the bottom intake pipe 42, and the polluted gas is forced into the treatment mechanism 5. In the adsorption box 51, activated carbon preferentially captures organic pollutants, and then the gas rises to the spray area. The atomized droplets sprayed by the water storage hood 54 dissolve residual acidic substances and soluble organic matter. The purified clean air is discharged from the side wall, while the spray wastewater is returned to the water storage hood 54 by the circulating pump after sedimentation to achieve liquid reuse. The whole process realizes intelligent air treatment through the closed-loop logic of detection, judgment, diversion and purification.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An indoor exhaust gas detection device, characterized in that: It includes a detection box (1), which contains a detection element (2) and an exhaust funnel (3). The bottom of the exhaust funnel (3) is provided with an airflow direction component (4) and a processing mechanism (5). The airflow direction component (4) includes an airflow tube (41), which has an air intake pipe (42), an exhaust pipe (43) and a control column (45) built into it. The processing mechanism (5) includes an adsorption box (51) and a water storage cover (54), the water storage cover (54) being located near the top surface of the adsorption box (51).

2. The indoor exhaust gas detection device according to claim 1, characterized in that: The top surface of the detection box (1) is provided with an air intake grille (11), and the air intake grille (11) can filter the incoming gas.

3. The indoor exhaust gas detection device according to claim 1, characterized in that: The inner wall of the test box (1) is fixed with an installation cover (12), and the installation cover (12) is located near the bottom of the air intake grille (11), and the exhaust funnel (3) is fixed with the bottom bolts during installation. An air intake fan (13) is provided inside the installation cover (12).

4. The indoor exhaust gas detection device according to claim 1, characterized in that: The air intake pipe (42) is located at the bottom outlet of the airflow cylinder (41) and is connected to the top interface of the adsorption box (51). The exhaust pipe (43) is located on the surface of the airflow cylinder (41) and extends to the outside of the detection box (1). One end of the airflow pipe is connected to an exhaust head (44).

5. An indoor exhaust gas detection device according to claim 1, characterized in that: The airflow cylinder (41) is located at the bottom outlet of the exhaust funnel (3) and the two are sealed together. The control column (45) is located in the interface on the surface of the airflow cylinder (41) and the two are movably connected and sealed to each other.

6. The indoor exhaust gas detection device according to claim 1, characterized in that: An airflow groove (46) runs through the center of the control column (45), and the airflow groove (46) can be connected to the exhaust pipe (43) and the intake pipe (42) in sequence after rotation.

7. An indoor exhaust gas detection device according to claim 1, characterized in that: The control column (45) is fitted with connecting seats (47) at both ends, and the connecting seats (47) are fitted with the inner wall of the detection box (1) and fixed with bolts, so as to realize the installation and limiting of the control column (45).

8. The indoor exhaust gas detection device according to claim 1, characterized in that: The bottom of the adsorption box (51) is provided with a base (53), and an adsorption plate (52) is installed in the adsorption box (51) in an array, and activated carbon can be placed on the adsorption plate (52).

9. An indoor exhaust gas detection device according to claim 1, characterized in that: The testing box (1) has purification and exhaust holes (57) on both the front and back. The water storage cover (54) has nozzles (55) arranged in a circular array at the bottom, and the water storage cover (54) is located below the purification and exhaust holes (57).

10. An indoor exhaust gas detection device according to claim 7, characterized in that: The bottom of the water storage cover (54) is provided with a circulation pipe (56), and one end of the circulation pipe (56) is connected to the interface of the water storage cover (54), and the other end is close to the bottom surface inside the test box (1).

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