Indoor air quality detection device

Abstract

The invention relates to an indoor air quality detection device, and relates to the technical field of indoor environment monitoring, the indoor air quality detection device comprises a box body and a supporting frame, the supporting frame is installed at the lower end of the box body, a formaldehyde sensor and an ammonia gas sensor are installed in the box body, and a first air inlet assembly and a second air inlet assembly are installed on the box body. The first gas inlet assembly is connected with a formaldehyde sensor, the second gas inlet assembly is connected with an ammonia gas sensor, a temperature control mechanism is installed in the box body and used for controlling the temperature of gas in the first gas inlet assembly and the second gas inlet assembly, and a control module is installed in the box body and used for controlling the temperature of gas in the first gas inlet assembly and the second gas inlet assembly. And the temperature control mechanism is electrically connected with the control module. The method has the effect of avoiding the influence of temperature errors on the detection precision.

Description

Technical Field

[0001] The present application relates to the field of indoor environment monitoring technology, and in particular to an indoor air quality detection device. Background Art

[0002] Indoor air quality detection devices are an indispensable part of modern life. They are used to monitor and analyze the concentration of various pollutants in the indoor environment, helping users understand the air quality status in their living or working spaces. As people pay more and more attention to healthy living and working environments, the application scope of indoor air quality detection devices is also expanding. It is not only limited to family homes, but also widely used in public places such as offices, schools, and hospitals. These devices provide users with accurate data support by detecting harmful substances such as formaldehyde and ammonia in the air, so that they can take corresponding measures to improve indoor air quality and ensure people's health.

[0003] At present, the commonly used indoor air quality detection devices on the market mainly rely on formaldehyde detectors and ammonia detectors to monitor the concentration of harmful gases in indoor air. To achieve this goal, common methods include the use of chemical reagents, photoionization detection (PID) and electrochemical sensors. Among them, the chemical reagent method generates observable color changes through chemical reactions to determine the gas concentration; the photoionization detection method uses ultraviolet irradiation to generate ion currents and then measures the gas concentration; and the electrochemical sensor method determines the gas concentration through the changes in electrical signals generated by the electrochemical reaction between gas molecules and the sensor surface. In addition, some advanced detection devices are also equipped with data recording and transmission functions, which can monitor and record changes in indoor air quality in real time.

[0004] However, the existing indoor air quality detection devices have a significant defect in practical applications. That is, due to the inconsistency of indoor ambient temperature, the temperature of the gas to be detected is different when it enters the detection device, thus affecting the accuracy of the detection results. Temperature changes will affect the diffusion rate and chemical reaction rate of the gas, which will lead to deviations in the readings of the detection instrument. This temperature-induced error is particularly obvious during long-term monitoring, which seriously affects the user experience and the reliability of the detection results. Summary of the invention

[0005] In order to avoid the influence of temperature error on detection accuracy, the present application provides an indoor air quality detection device.

[0006] The indoor air quality detection device provided in this application adopts the following technical solution: An indoor air quality detection device comprises a box and a support frame, wherein the support frame is installed at the lower end of the box, a formaldehyde sensor and an ammonia sensor are installed in the box, a first air intake assembly and a second air intake assembly are installed on the box, the first air intake assembly is connected to the formaldehyde sensor, and the second air intake assembly is connected to the ammonia sensor, a temperature control mechanism is installed in the box, the temperature control mechanism is used to control the temperature of the gas in the first air intake assembly and the second air intake assembly, and a control module is installed in the box, and the temperature control mechanism is electrically connected to the control module.

[0007] By adopting the above technical solution, the indoor air quality detection device can maintain stable detection accuracy under different temperature conditions. The temperature control mechanism controls the temperature of the gas in the first air intake assembly and the second air intake assembly to ensure that the temperature of the gas entering the formaldehyde sensor and the ammonia sensor is constant, eliminating the detection error caused by temperature changes and improving the accuracy and reliability of the detection results. At the same time, the precise control of the temperature control mechanism by the control module further improves the intelligence level and user experience of the entire system.

[0008] In a specific possible implementation scheme, the first air intake component includes an air intake hopper, an air suction pump and a ventilation pipe, the air intake hopper is installed at the upper end of the box body, the air intake hopper air outlet is arranged in the box body, the air suction pump is installed in the air intake hopper, one end of the ventilation pipe is installed at the air outlet at the lower end of the air intake hopper, and the other end of the ventilation pipe leads to the formaldehyde sensor, the first air intake component and the second air intake component are arranged in the same structure, and the first air intake component and the second air intake component are installed side by side on the box body.

[0009] By adopting the above technical solution, the design of the air intake bucket ensures the effective collection of gas, and the air pump improves the gas suction efficiency and ensures the representativeness of the gas sample. Secondly, the setting of the ventilation pipe enables the gas to be smoothly transmitted to the corresponding sensor. At the same time, the first air intake assembly and the second air intake assembly have the same structure and are installed side by side, which ensures the consistency and synchronization of the two gas detections and improves the accuracy and reliability of the detection.

[0010] In a specific possible implementation scheme, it also includes a one-way valve, which includes a limit sleeve, a limit spring and an air stop plug. A limit ring is installed at the lower end of the air inlet hopper, and the limit sleeve is installed at the air outlet of the air inlet hopper. A sleeve cavity is provided in the limit sleeve, and the air stop plug is slidably connected in the limit sleeve. One end of the limit spring is connected to the lower end surface of the air stop plug, and the other end of the limit spring is connected to the inner side wall of the lower end of the sleeve cavity.

[0011] By adopting the above technical solution, the addition of the one-way valve ensures that the gas can only flow in one direction, preventing the external air from flowing back into the air intake hopper, and improving the stability and reliability of the detection device. Specifically, the design of the limit sleeve, limit spring and air stop plug enables the air stop plug to open when gas flows in, and close when there is no gas inflow or the gas flows in the reverse direction, effectively preventing the entry of external pollutants and ensuring the accuracy of the detection results.

[0012] In a specific feasible implementation scheme, a first detection chamber and a second detection chamber are provided on the lower end surface of the housing, the formaldehyde sensor is installed in the first detection chamber, the ammonia sensor is installed in the second detection chamber, the end of the ventilation pipe facing away from the air intake hopper is connected to the first detection chamber, and the second air intake assembly is connected to the second detection chamber to pass the gas into the second detection chamber.

[0013] By adopting the above technical scheme, the setting of the first detection cavity and the second detection cavity ensures that formaldehyde and ammonia are detected in independent spaces respectively, avoiding cross interference and improving the accuracy of the detection results; the connection method between the ventilation tube and the first detection cavity and the second detection cavity ensures that the gas can smoothly enter the corresponding detection cavity, further improving the detection efficiency and stability.

[0014] In a specific feasible implementation scheme, the temperature control mechanism includes a liquid storage tank, a first cooling box and a second cooling box. The liquid storage tank is installed in the box body, the first cooling box is installed corresponding to the formaldehyde sensor, and the second cooling box is installed corresponding to the ammonia sensor. The liquid storage tank is connected to the first cooling box and the second cooling box through different circulation pumps, respectively. The ventilation pipe in the first air intake assembly is set through the first cooling box, and the ventilation pipe in the second air intake assembly is set through the second cooling box.

[0015] By adopting the above technical solution, the temperature control mechanism can effectively control the gas temperature in the first air intake assembly and the second air intake assembly, ensuring that the temperature of the gas entering the formaldehyde sensor and the ammonia sensor remains constant. This helps to improve the detection accuracy, avoid errors caused by temperature changes, and improve the overall performance of the indoor air quality detection device.

[0016] In a specific possible implementation manner, the ventilation pipe located in the first cooling box and the ventilation pipe installed in the second cooling box are spirally arranged.

[0017] By adopting the above technical solution, the spirally arranged ventilation pipe can increase the path length of the gas in the cooling box and prolong the contact time between the gas and the cooling medium, thereby improving the cooling efficiency of the gas and ensuring that the temperature of the gas entering the detection chamber is more stable, thereby improving the accuracy and reliability of formaldehyde and ammonia detection.

[0018] In a specific implementation scheme, a first temperature control sensor is provided at the connection between the ventilation pipe in the first air intake component and the first detection chamber and at the connection between the ventilation pipe in the second air intake component and the second detection chamber. The first temperature control sensor is electrically connected to the control module, and the control module is electrically connected to the circulation pump.

[0019] By adopting the above technical solution, the indoor air quality detection device can monitor the temperature of the gas in real time before it enters the detection chamber, and adjust the working state of the circulation pump through the control module to ensure that the gas is detected at a constant temperature, effectively avoiding the problem of decreased detection accuracy due to temperature changes, and improving the accuracy and reliability of the detection results.

[0020] In a specific feasible implementation scheme, a vent is opened on the side wall of the box body, and a ventilation device is arranged in the vent. The ventilation device includes an inlet fan, a rotary switch mechanism and a pressure sensor. The inlet fan is installed in the vent, and the rotary switch mechanism is installed on the side of the vent adjacent to the outside of the box body. The pressure sensor is installed in the rotary switch mechanism. The rotary switch mechanism can squeeze the pressure sensor, and the pressure sensor is electrically connected to the inlet fan and the control module.

[0021] By adopting the above technical solution, the vents and the ventilation devices inside them can effectively regulate the air circulation inside and outside the box to ensure the stability of the environment inside the box. Specifically, the air inlet fan can accelerate the air exchange between the inside and outside of the box, and the design of the rotary switch mechanism enables the vents to be closed when necessary to prevent external polluted gases from entering the box. At the same time, the use of the pressure sensor and the control module can automatically adjust the working state of the air inlet fan according to actual needs, realize intelligent control, and improve the reliability and accuracy of the detection device.

[0022] In a specific feasible implementation scheme, the rotary switch mechanism includes a driving motor, a limit shell, a turntable and a wind shield, the limit shell being installed on the inner wall of the ventilation hole, the turntable being rotatably connected in the limit shell, the turntable being provided with a limit slot, the wind shield being provided with a plurality of limit blocks at the lower ends of the plurality of wind shields, the limit blocks being slidably connected in the limit slot, the upper end surfaces of the wind shields being provided with slide rods, the limit shell being provided with slide slots corresponding to the plurality of wind shields, the slide rod being slidably connected in the slide slots, the side wall of the limit shell being provided with a limit shell mounting slot, the limit shell mounting slot being provided through the side wall of the limit shell, the driving motor being installed in the ventilation hole, the driving motor output shaft being provided with a driving gear, the side wall of the turntable being provided with a tooth slot, the driving gear extending into the limit shell mounting slot and meshing in the tooth slot.

[0023] By adopting the above technical solution, the rotary switch mechanism realizes intelligent control of the opening and closing state of the vent. Specifically, the drive motor cooperates with the tooth groove of the turntable through the driving gear to realize the precise rotation of the turntable, thereby driving the limit block to move in the limit groove, so that the wind shield slides up and down in the slide groove, thereby changing the opening and closing degree of the vent. This design not only improves the adjustment accuracy of the vent, but also can respond quickly according to needs, ensuring indoor air circulation while preventing external pollution from entering, further improving the use effect and user experience of the air quality detection device.

[0024] In a specific implementation scheme, it also includes a second temperature control sensor, which is installed in the box. The second temperature control sensor is electrically connected to the control module, and the control module is electrically connected to the drive motor.

[0025] By adopting the above technical solution, the second temperature control sensor can monitor the temperature inside the box in real time and transmit the temperature signal to the control module. The control module adjusts the working state of the drive motor according to the received temperature signal, and then adjusts the position of the rotary switch mechanism to achieve precise control of the opening and closing degree of the vent. This design effectively ensures the stability of the temperature inside the box, improves the detection accuracy, and ensures the accuracy of the air quality detection results.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting a temperature control mechanism in the box, the temperature of the gas entering the first air intake assembly and the second air intake assembly is controlled, which effectively solves the influence of temperature change on the detection accuracy and improves the stability and reliability of the detection results; 2. The control module is electrically connected to the temperature control mechanism, which can automatically adjust the gas temperature according to actual needs to ensure the constant gas temperature during the detection process, further improving the detection accuracy; 3. The first air intake assembly and the second air intake assembly have the same structure and are installed side by side, so that the detection process of formaldehyde and ammonia is more synchronized, avoiding the result deviation caused by the difference in detection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application.

[0028] Figure 2 A cross-sectional view of the box.

[0029] Figure 3 for Figure 2 Enlarged view of part A.

[0030] Figure 4 It is a structural schematic diagram of the rotary switch mechanism.

[0031] Figure 5 It is a structural diagram showing the installation relationship between the turntable and the pressure sensor.

[0032] Explanation of the reference numerals: 1. housing; 11. first detection chamber; 12. second detection chamber; 2. support frame; 3. first air intake assembly; 31. air intake hopper; 32. suction pump; 33. ventilation pipe; 34. one-way valve; 341. limiting sleeve; 3411. sleeve cavity; 342. limiting spring; 343. air stop plug; 4. second air intake assembly; 5. formaldehyde sensor; 6. ammonia sensor; 7. temperature control mechanism; 71. liquid storage tank; 72. first cooling tank; 73. second cooling tank ; 74. Circulation pump; 8. Control module; 9. Ventilation device; 91. Inlet fan; 92. Rotary switch mechanism; 921. Drive motor; 922. Limit shell; 9221. Slide groove; 9222. Limit shell mounting groove; 923. Turntable; 9231. Limit groove; 9232. Tooth groove; 924. Wind shield; 9241. Limit block; 9242. Slide rod; 925. Drive gear; 93. Pressure sensor; 10. First temperature control sensor; 11a. Second temperature control sensor. DETAILED DESCRIPTION

[0033] The embodiment of the present application discloses an indoor air quality detection device.

[0034] like Figure 1 As shown, the indoor air quality detection device includes a box body 1 and a support frame 2, and the support frame 2 is installed at the lower end of the box body 1. A formaldehyde sensor 5 and an ammonia sensor 6 are installed in the box body 1, and a first air intake component 3 and a second air intake component 4 are installed on the box body 1. The first air intake component 3 is connected to the formaldehyde sensor 5, and the second air intake component 4 is connected to the ammonia sensor 6. A temperature control mechanism 7 is installed in the box body 1, and the temperature control mechanism 7 is used to control the temperature of the gas in the first air intake component 3 and the second air intake component 4. A control module 8 is installed in the box body 1, and the temperature control mechanism 7 is electrically connected to the control module 8. The control module 8 can be a microprocessor or a single-chip microcomputer, which is used to receive electrical signals. The control module 8 can also be connected to an external device through a wireless communication module to achieve remote monitoring and data transmission.

[0035] like Figure 2 and Figure 3As shown, the first air intake component 3 includes an air intake hopper 31, an air suction pump 32, a vent pipe 33 and a one-way valve 34. The air intake hopper 31 is installed at the upper end of the box body 1, and the air outlet of the air intake hopper 31 penetrates the upper side wall of the box body 1 and extends into the box body 1. The air suction pump 32 is installed in the air intake hopper 31, and the one-way valve 34 is installed in the air outlet at the lower end of the air intake hopper 31. The one-way valve 34 includes a limiting sleeve 341, a limiting spring 342 and an air stop plug 343. The limiting sleeve 341 is installed at the air outlet of the air intake hopper 31, and a sleeve cavity 3411 is provided in the limiting sleeve 341. The air stop plug 343 is slidably connected in the limiting sleeve 341. One end of the limit spring 342 is connected to the lower end surface of the air stop plug 343, and the other end of the limit spring 342 is connected to the inner side wall of the lower end of the sleeve cavity 3411. One end of the vent pipe 33 is installed at the air outlet at the lower end of the air inlet bucket 31, and the other end of the vent pipe 33 leads to the formaldehyde sensor 5. In other embodiments, a guide groove can be provided in the limit sleeve 341, and a guide block matching the guide groove is provided on the air stop plug 343 to ensure that the air stop plug 343 maintains linear motion during movement to avoid jamming. The connection method of the limit sleeve 341 and the limit ring can be threaded or snap-fit, which is easy to disassemble and clean. The structure of the second air intake component 4 is the same as that of the first air intake component 3, and the second air intake component 4 is used to ventilate the ammonia sensor 6.

[0036] The temperature control mechanism 7 includes a liquid storage tank 71, a first cooling box 72 and a second cooling box 73. The liquid storage tank 71 is installed in the box body 1. The first cooling box 72 is installed corresponding to the formaldehyde sensor 5, and the second cooling box 73 is installed corresponding to the ammonia sensor 6. The liquid storage tank 71 is connected to the first cooling box 72 and the second cooling box 73 through different circulation pumps 74 respectively. The ventilation pipe 33 in the first air intake component 3 is set through the first cooling box 72, and the ventilation pipe 33 in the second air intake component 4 is set through the second cooling box 73. The first air intake component 3 and the second air intake component 4 both include an air intake hopper 31, an air suction pump 32 and a ventilation pipe 33. The air intake hopper 31 is installed at the upper end of the box body 1, and the air outlet of the air intake hopper 31 is set in the box body 1. The air suction pump 32 is installed in the air intake hopper 31. One end of the ventilation pipe 33 is installed at the air outlet at the lower end of the air intake hopper 31, and the other end of the ventilation pipe 33 leads to the formaldehyde sensor 5 or the ammonia sensor 6.

[0037] The liquid in the liquid storage tank 71 can be water or other cooling media, such as ethylene glycol solution, to meet different temperature requirements. A heat sink is provided inside the liquid storage tank 71 to enhance the heat transfer efficiency. The vent pipe 33 can be made of stainless steel material, which has good corrosion resistance and thermal conductivity, or a copper tube, which has better thermal conductivity. The vent pipe 33 is spirally arranged in the first cooling box 72 and the second cooling box 73, which increases the contact area between the gas and the coolant and improves the heat exchange efficiency.

[0038] A first detection chamber 11 and a second detection chamber 12 are provided on the lower end surface of the box body 1, a formaldehyde sensor 5 is installed in the first detection chamber 11, an ammonia sensor 6 is installed in the second detection chamber 12, a vent pipe 33 is connected to the first detection chamber 11 at one end away from the air inlet hopper 31, and a second air inlet assembly 4 is connected to the second detection chamber 12 to pass the gas into the second detection chamber 12. A first temperature sensor is provided inside the first detection chamber 11 and the second detection chamber 12 to monitor the temperature of the gas when it enters the detection chamber to ensure that the gas temperature is within a set range, the first temperature sensor is electrically connected to the control module 8, and the control module 8 is electrically connected to the circulation pump 74, so that according to the temperature of the gas introduced, the first temperature sensor sends an electrical signal to the control module 8, and then the control module 8 controls the flow rate of the pumped coolant to adjust the degree of cooling of the gas.

[0039] like Figure 4 and Figure 5 As shown, a vent is opened on the side wall of the box body 1, and a ventilation device 9 is arranged in the vent. The ventilation device 9 includes an inlet fan 91, a rotary switch mechanism 92 and a pressure sensor 93. The inlet fan is installed in the vent, and the rotary switch mechanism 92 is installed on the side of the vent adjacent to the outside of the box body 1. The pressure sensor 93 is installed in the rotary switch mechanism 92. The rotary switch mechanism 92 can squeeze the pressure sensor 93. The pressure sensor 93 is electrically connected to the inlet fan 91 and the control module 8.

[0040] The function of the ventilation device 9 is to introduce fresh air when necessary, to remove the exhaust gas in the box body 1, and to maintain the air circulation in the box body 1. The air inlet fan 91 can be driven by a brushless DC motor, which has the characteristics of low noise and long life. The rotary switch mechanism 92 includes a driving motor 921, a limit shell 922, a turntable 923 and a windshield 924. The limit shell 922 is installed on the inner wall of the ventilation hole, and the turntable 923 is rotatably connected in the limit shell 922. A limit slot 9231 is provided on the turntable 923. There are several windshields 924. A limit block 9241 is provided at the lower end of the windshields 924. The limit block 9241 is slidably connected in the limit slot 9231. A sliding rod 9242 is provided on the upper end surface of the windshield 924. A slide slot 9221 is provided on the limit shell 922 corresponding to the windshields 924. The slide rod 9242 is slidably connected in the slide slot 9221. The limit A limit shell mounting groove 9222 is arranged on the side wall of the shell 922, and the limit shell mounting groove 9222 penetrates through the side wall of the limit shell 922. The driving motor 921 is installed in the vent, and a driving gear 925 is arranged on the output shaft of the driving motor 921. A tooth groove 9232 is arranged on the side wall of the turntable 923. The driving gear 925 extends into the limit shell mounting groove 9222 and is engaged in the tooth groove 9232. The pressure sensor 93 is installed in the limit groove 9231. A force transmission spring is installed between the pressure sensor 93 and the limit block 9241. One end of the force transmission spring is fixedly connected to the limit block 9241, and the other end of the force transmission spring is pressed against the pressure sensor 93.

[0041] The driving motor 921 can be a stepper motor or a servo motor, which has the characteristics of precise control and high response speed. The pressure sensor 93 can be a resistive or capacitive pressure sensor 93, which has high sensitivity and reliability. The control module 8 can automatically adjust the speed of the driving motor 921 according to the signal of the pressure sensor 93 to achieve dynamic balance of the air in the box 1.

[0042] In the embodiment of the present application, a second temperature control sensor is also included. The second temperature control sensor is installed in the box body 1. The second temperature control sensor is electrically connected to the control module 8, and the control module 8 is electrically connected to the drive motor 921.

[0043] The second temperature control sensor is used to monitor the temperature in the box 1 to ensure that the temperature in the box 1 is within a suitable range. The second temperature control sensor can be an NTC thermistor or a PT100 platinum resistor, which has high precision and high stability. The control module 8 can automatically adjust the speed of the drive motor 921 according to the signal of the second temperature control sensor, thereby controlling the opening and closing degree of the windshield 924 to achieve a dynamic balance of the temperature in the box 1.

[0044] The implementation principle of an indoor air quality detection device in an embodiment of the present application is as follows: by setting a temperature control mechanism 7 in the box body 1, the temperature of the gas entering the detection device can be effectively controlled to avoid the influence of temperature changes on the detection accuracy. Specifically, after the gas enters the air inlet hopper 31, it is sent to the ventilation pipe 33 through the suction pump 32, and the ventilation pipe 33 passes through the cooling box. The gas is cooled to the set temperature in the cooling box before entering the detection chamber. In this way, no matter how the external ambient temperature changes, the temperature of the gas entering the detection chamber is always maintained within the set range, thereby improving the accuracy of the detection results. In addition, through the intelligent control of the control module 8, the flow rate of the coolant can be adjusted according to the actual situation, further improving the reliability and stability of the system.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An indoor air quality detection device, comprising a box (1) and a support frame (2), wherein the support frame (2) is installed at the lower end of the box (1), and is characterized in that: A formaldehyde sensor (5) and an ammonia sensor (6) are installed in the box (1); a first air intake component (3) and a second air intake component (4) are installed on the box (1); the first air intake component (3) is connected to the formaldehyde sensor (5); the second air intake component (4) is connected to the ammonia sensor (6); a temperature control mechanism (7) is installed in the box (1); the temperature control mechanism is used to control the temperature of the gas in the first air intake component (3) and the second air intake component (4); a control module (8) is installed in the box (1); the temperature control mechanism is electrically connected to the control module (8).

2. The indoor air quality detection device according to claim 1, characterized in that: The first air intake component (3) comprises an air intake hopper (31), an air suction pump (32) and a ventilation pipe (33); the air intake hopper (31) is mounted at the upper end of the housing (1); an air outlet of the air intake hopper (31) is arranged in the housing (1); the air suction pump (32) is mounted in the air intake hopper (31); one end of the ventilation pipe (33) is mounted at the air outlet at the lower end of the air intake hopper (31); the other end of the ventilation pipe (33) leads to the formaldehyde sensor (5); the first air intake component (3) and the second air intake component (4) have the same structure; the first air intake component (3) and the second air intake component (4) are mounted side by side on the housing (1).

3. The indoor air quality detection device according to claim 2, characterized in that: The invention also comprises a one-way valve (34), wherein the one-way valve (34) comprises a limiting sleeve (341), a limiting spring (342) and an air stop plug (343); a limiting ring is installed at the lower end of the air inlet hopper (31); the limiting sleeve (341) is installed at the air outlet of the air inlet hopper (31); a sleeve cavity (3411) is arranged in the limiting sleeve (341); the air stop plug (343) is slidably connected in the limiting sleeve (341); one end of the limiting spring (342) is connected to the lower end surface of the air stop plug (343); and the other end of the limiting spring (342) is connected to the inner side wall of the lower end of the sleeve cavity (3411).

4. The indoor air quality detection device according to claim 2, characterized in that: A first detection chamber (11) and a second detection chamber (12) are provided on the lower end surface of the box body (1); the formaldehyde sensor (5) is installed in the first detection chamber (11); the ammonia sensor (6) is installed in the second detection chamber (12); the end of the ventilation pipe (33) facing away from the air intake hopper (31) is connected to the first detection chamber (11); the second air intake assembly (4) is connected to the second detection chamber (12) to pass gas into the second detection chamber (12).

5. The indoor air quality detection device according to claim 2, characterized in that: The temperature control mechanism comprises a liquid storage tank (71), a first cooling box (72) and a second cooling box (73); the liquid storage tank (71) is installed in the box body (1); the first cooling box (72) is installed corresponding to the formaldehyde sensor (5); the second cooling box (73) is installed corresponding to the ammonia sensor (6); the liquid storage tank (71) is connected to the first cooling box (72) and the second cooling box (73) through different circulation pumps (74); the ventilation pipe (33) in the first air intake component (3) is arranged to pass through the first cooling box (72); and the ventilation pipe (33) in the second air intake component (4) is arranged to pass through the second cooling box (73).

6. The indoor air quality detection device according to claim 3, characterized in that: The ventilation pipe (33) located in the first cooling box (72) and the ventilation pipe (33) installed in the second cooling box (73) are spirally arranged.

7. The indoor air quality detection device according to claim 5, characterized in that: A first temperature control sensor (10) is provided at the connection between the ventilation pipe (33) in the first air intake component (3) and the first detection chamber (11), and at the connection between the ventilation pipe (33) in the second air intake component (4) and the second detection chamber (12); the first temperature control sensor (10) is electrically connected to the control module (8), and the control module (8) is electrically connected to the circulation pump (74).

8. The indoor air quality detection device according to claim 1, characterized in that: A vent is provided on the side wall of the box body (1), and a ventilation device (9) is arranged in the vent. The ventilation device (9) comprises an air intake fan (91), a rotary switch mechanism (92) and a pressure sensor (93). The air intake fan is installed in the vent, and the rotary switch mechanism (92) is installed on the side of the vent adjacent to the outside of the box body (1). The pressure sensor (93) is installed in the rotary switch mechanism (92). The rotary switch mechanism (92) can squeeze the pressure sensor (93). The pressure sensor (93) is electrically connected to the air intake fan (91) and the control module (8).

9. The indoor air quality detection device according to claim 8, characterized in that: The rotary switch mechanism (92) comprises a driving motor (921), a limiting shell (922), a rotating disk (923) and a windshield (924); the limiting shell (922) is mounted on the inner side wall of the ventilation hole; the rotating disk (923) is rotatably connected in the limiting shell (922); a limiting slot (9231) is provided on the rotating disk (923); a plurality of windshields (924) are provided, and a limiting block (9241) is provided at the lower end of each of the plurality of windshields (924); the limiting block (9241) is slidably connected in the limiting slot (9231); a sliding rod (9242) is provided on the upper end surface of the windshield (924); and the limiting shell (922) is provided with a rotating disk (9231). A plurality of windshield plates (924) are provided with sliding grooves (9221) corresponding to the windshield plates (924), the sliding rod (9242) is slidably connected in the sliding grooves (9221), a limiting shell mounting groove (9222) is provided on the side wall of the limiting shell (922), the limiting shell mounting groove (9222) penetrates the side wall of the limiting shell (922), the driving motor (921) is installed in the vent, a driving gear (925) is provided on the output shaft of the driving motor (921), a tooth groove (9232) is provided on the side wall of the turntable (923), the driving gear (925) extends into the limiting shell mounting groove (9222) and is meshed in the tooth groove (9232).

10. The indoor air quality detection device according to claim 9, characterized in that: It also includes a second temperature control sensor, which is installed in the box (1), the second temperature control sensor is electrically connected to the control module (8), and the control module (8) is electrically connected to the drive motor (921).

Images