Equipment and method for rapidly detecting environmental protection performance of house building material

Abstract

The invention relates to equipment and method for rapidly detecting the environmental protection performance of a house building material, and belongs to the technical field of building material detection.The equipment comprises a PID detection module and an electrochemical detection module and further comprises a collection bin, a detection bin and a power bin, and the collection bin abuts against the surface of a leather building material; the detection bin is connected with the PID detection module and the electrochemical detection module; the power bin is connected between the collection bin and the detection bin and is provided with an air heater, the air heater blows hot air into the collection bin when rotating forwards, and gas in the collection bin is fed into the detection bin when the air heater rotates backwards; the technical problem of low accuracy of indoor air pollution source positioning in the prior art can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of building material testing, and particularly relates to a rapid detection device and method for the environmental protection performance of building materials for houses. Background Art

[0002] In building materials for houses, especially in leather decoration materials, TVOC (total volatile organic compounds) is often slowly released during use due to manufacturing processes. In order to ensure the environmental protection performance of furniture or decorations made of leather decoration materials, a detection device is needed to quickly detect the environmental protection performance of furniture or decorations made of leather decoration materials.

[0003] A patent with the publication number CN112285299B discloses an environmental protection building material formaldehyde detection device, which includes a main shell assembly, a rear drive assembly, a front steering assembly, and a formaldehyde detection assembly; the main shell assembly is the structural main body, including a bottom shell and an upper cover; the rear drive assembly is fixedly installed at the rear end of the bottom shell in the main shell assembly and can provide power for forward and backward movement; the front steering assembly is fixedly installed at the front end of the bottom shell in the main shell assembly and is used to realize automatic steering during movement; the formaldehyde detection assembly is fixedly installed at the detection assembly installation position of the upper cover in the main shell assembly. The formaldehyde detection assembly includes four groups of automatically rotatable formaldehyde detectors, which can take gas samples at different sampling points in the area, with higher accuracy. At the same time, it can move up and down under the drive of a lifting drive motor, and the detection range is wider.

[0004] The prior art has the following defects:

[0005] Only the gas samples in the collection area are detected, which will result in the inability to accurately detect the air pollution sources in a house that has been decorated, and the accuracy of locating indoor air pollution sources is low. Summary of the Invention

[0006] The present invention provides a rapid detection device and method for the environmental protection performance of building materials for houses, which can solve the technical problem of low accuracy in locating indoor air pollution sources in the prior art.

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] The present application provides a rapid detection device for the environmental protection performance of building materials for houses, including a PID detection module and an electrochemical detection module. It further includes a collection chamber, a detection chamber, and a power chamber. The collection chamber abuts against the surface of leather building materials; the detection chamber is connected to the PID detection module and the electrochemical detection module; the power chamber is connected between the collection chamber and the detection chamber. The power chamber has a hot air blower. When the hot air blower rotates forward, hot air is blown into the collection chamber, and when the hot air blower rotates backward, the gas in the collection chamber is sent into the detection chamber.

[0009] Through the above technical solution, a solution is adopted in which the collection bin directly abuts against the leather building materials and the hot air accelerates the volatilization of TVOC in a short time, and the environmental performance of specific leather building materials is detected, improving the accuracy of positioning indoor air pollution sources.

[0010] In the present invention, the above rapid detection device further includes a spiral tube, the spiral tube is connected between the hot air blower and the collection bin, and silica gel particles are filled in the spiral tube, and the silica gel particles are used to adsorb water vapor in the air.

[0011] Through the above technical solution, the silica gel particles in the spiral tube are used to adsorb water vapor in the air, reducing the influence of air humidity on the detection result. At the same time, the hot and humid air can also accelerate the volatilization of TVOC in the leather building materials, further improving the TVOC enrichment degree of the detection sample, and thus obtaining a relatively accurate detection result.

[0012] In the present invention, the above rapid detection device further includes an elastic bladder, the elastic bladder is connected between the collection bin and the surface of the leather building materials, and the elastic bladder makes the collection bin and the surface of the leather building materials fit tightly.

[0013] Through the above technical solution, the elastic bladder is used to make the collection bin and the surface of the leather building materials fit tightly, which can form a negative pressure on the surface of the leather building materials when the hot air blower sucks the air in the collection bin, and thus identify whether the leather building materials are genuine leather materials or artificial leather materials.

[0014] In the present invention, a plurality of electrode columns are connected to one end of the collection bin facing the elastic bladder, and a conductive ring is connected to a surface of the elastic bladder away from the collection bin. When the collection bin moves towards the surface of the leather building materials, the elastic bladder is compressed. After the elastic bladder is deformed under pressure, the electrode columns contact the conductive ring. When the electrode columns contact the conductive ring, the hot air blower is short-circuited.

[0015] Through the above technical solution, when the leather building materials are artificial leather materials without pores, it will cause the negative pressure in the collection bin to increase and then compress the elastic bladder, causing the electrode columns and the conductive ring to contact and thus short-circuiting the hot air blower, so that the device has the function of distinguishing genuine leather and artificial leather.

[0016] In the present invention, the above detection bin has a first detection space and a second detection space. The first detection space is connected to the PID detection module and the hot air blower, the second detection space is connected to the electrochemical detection module, and a nanofiltration membrane is connected between the first detection space and the second detection space, and the nanofiltration membrane allows formaldehyde to pass through.

[0017] Through the above technical solution, formaldehyde is separated from TVOC by a nanofiltration membrane, thereby removing the interference of other volatile organic gases in the formaldehyde detection process and improving the detection accuracy.

[0018] In the present invention, the above rapid detection device further includes a supplementary air pipe and a sample delivery pipe. The supplementary air pipe is connected to the outside of the hot air blower and the power chamber; the sample delivery pipe is connected to the hot air blower and the first detection space; only air is allowed to be inhaled into the hot air blower from the outside through the supplementary air pipe, and only the air is allowed to enter the first detection space from the hot air blower through the sample delivery pipe.

[0019] Through the above technical solution, by adopting the method of supplementing air from the outside, the water absorption of the silica gel particles can be further saturated, and the effect of the collection chamber for obtaining TVOC can be enhanced.

[0020] In the present invention, the above rapid detection device further includes a variable volume body, and a plurality of variable volume bodies are connected to the side wall of the second detection space facing away from the first detection space.

[0021] Through the above technical solution, the variable volume body is used to balance the pressure in the detection chamber, and the influence of the change and fluctuation of the pressure on the detection result is reduced.

[0022] In the present invention, the above rapid detection device further includes a filter sheet, and the filter sheet is connected in the supplementary air pipe.

[0023] Through the above technical solution, the filter sheet is adopted to improve the cleanliness of the incoming air and avoid the influence of dust entry on the detection accuracy.

[0024] This application also provides a rapid detection method for the environmental protection performance of building materials for houses. It uses the above rapid detection device for the environmental protection performance of building materials for houses, and further includes the following steps:

[0025] Step S1: After removing the variable volume body, start the hot air blower to rotate in reverse, so that air enters the spiral tube through the collection chamber. Wait until the silica gel particles absorb water vapor to a saturated state, reinstall the variable volume body, and make the variable volume body pop out into the detection chamber;

[0026] Step S2: Place the rapid detection device for the environmental protection performance of building materials for houses against the surface of the leather building materials, and start the hot air blower to rotate forward for a preset time. The hot air causes the water vapor in the silica gel particles to be fully desorbed to form humid hot air, which fills the collection chamber;

[0027] Step S3: Keep the humid hot air in the collection chamber cooled to room temperature, and start the hot air blower to rotate in reverse until the variable volume body deforms from being sunken inward relative to the outer surface of the detection chamber to protruding outward relative to the outer surface of the detection chamber;

[0028] Step S4: Start the PID detection module to read the TVOC detection data, and start the electrochemical detection module to read the formaldehyde detection data.

[0029] Through the above technical solution, the silica gel particles are used to adsorb water vapor, and the hot air blower blows out hot air to desorb the water vapor adsorbed by the silica gel particles, so as to obtain humid and hot gas acting on the leather building materials below the collection bin, improving the enrichment degree of TVOC in the gas in the collection bin, and thus more accurate detection results can be obtained. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Isometric view of a rapid detection device for the environmental protection performance of building materials for houses provided by an embodiment of the present invention;

[0032] Figure 2 Front view of a rapid detection device for the environmental protection performance of building materials for houses provided by an embodiment of the present invention;

[0033] Figure 3 Is Figure 2 The sectional view taken along line A-A in

[0034] Figure 4 Is Figure 3 The partial enlarged view at B in

[0035] Figure 5 Is Figure 3 The view after the elastic capsule is compressed and deformed in the partial enlarged view at B in

[0036] Figure 6 Side view of a rapid detection device for the environmental protection performance of building materials for houses provided by an embodiment of the present invention;

[0037] Figure 7 Is Figure 6 The sectional view taken along line C-C in

[0038] Figure 8 Exploded view of a rapid detection device for the environmental protection performance of building materials for houses provided by an embodiment of the present invention.

[0039] Icon: 1 - PID detection module; 2 - Electrochemical detection module; 3 - Collection chamber; 301 - Spiral tube; 3011 - Silica gel particles; 302 - Elastic bladder; 3021 - Electrode column; 3022 - Conductive ring; 4 - Power chamber; 401 - Hot air blower; 402 - Air supply pipe; 4021 - Filter sheet; 403 - Sample delivery pipe; 5 - Detection chamber; 501 - First detection space; 502 - Second detection space; 503 - Nanofiltration membrane; 504 - Variable volume body. Detailed implementation mode

[0040] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0042] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0043] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be welding, bolt connection, or riveting; it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0044] Embodiment:

[0045] Please refer to Figures 1 to 8 , Figures 1 to 8 which shows an embodiment of the present application.

[0046] This embodiment provides a rapid detection device for the environmental protection performance of building materials, as shown in Figure 1 and Figure 2As shown in the figure, it includes a PID detection module 1 and an electrochemical detection module 2. Exemplarily, the PID detection module 1 is based on a detector of model ppbRAE 3000, and the electrochemical detection module 2 is based on a sensor of model Interrscan4160. It also includes a collection chamber 3, a detection chamber 5, and a power chamber 4. The collection chamber 3 abuts against the surface of leather building materials (leather sofas, leather seat cushions); the detection chamber 5 is connected to the PID detection module 1 and the electrochemical detection module 2. After the probes of the two detection modules are connected through the transfer holes, they extend into the detection chamber 5; the power chamber 4 is connected between the collection chamber 3 and the detection chamber 5. As Figure 3 shown in the figure, the power chamber 4 has a hot air blower 401. When the hot air blower 401 rotates forward, hot air is blown into the collection chamber 3, and when the hot air blower 401 rotates in reverse, the gas in the collection chamber 3 is sent into the detection chamber 5.

[0047] Specifically, in addition to the fan body, the hot air blower 401 also has a resistance wire connected in series with a diode. When the hot air blower 401 rotates forward, the current passes through the diode to heat the resistance wire. When the hot air blower 401 rotates in reverse, the current cannot pass through the diode and thus the resistance wire does not heat up.

[0048] Through the above technical solution, the scheme of directly abutting the collection chamber 3 against the leather building materials and accelerating the volatilization of TVOC by hot air in a short time is adopted to detect the environmental protection performance of specific leather building materials, improving the accuracy of locating indoor air pollution sources.

[0049] As a preferred implementation manner, as Figure 3 、 Figure 7 and Figure 8 shown in the figure, the above rapid detection device also includes a spiral tube 301. The spiral tube 301 is connected between the hot air blower 401 and the collection chamber 3. Silica gel particles 3011 are filled in the spiral tube 301, and the silica gel particles 3011 are used to adsorb water vapor in the air.

[0050] It should be noted that the principle of silica gel adsorption and drying is that silica gel (SiO2・nH2O) removes water vapor through physical adsorption and has a low affinity for formaldehyde; the water absorption rate is about 30 - 40% (weight ratio); the formaldehyde adsorption rate is <0.1% (25℃, RH = 50%); and it has simple regeneration conditions: baking at 120℃ can restore the adsorption capacity. Therefore, when regeneration is required, hot air baking with the hot air blower 401 can complete the desorption of water vapor. At the same time, the hot air will form high-temperature and humid air and enter the collection chamber 3. After a certain degree of cooling in the collection chamber 3, the humid air penetrates into the interior of the leather building materials (penetrates into genuine leather or artificial leather with pores; non-porous artificial leather will cause heat accumulation during use due to its airtightness, which will exacerbate the volatilization of TVOC and is not a preferred choice for environmental protection building materials). The high temperature accelerates the volatilization of TVOC, and the high humidity increases the solubility of TVOC in the air.

[0051] Through the above technical solution, the silica gel particles 3011 in the spiral tube 301 are used to adsorb water vapor in the air, reducing the influence of air humidity on the test results. At the same time, the hot and humid air can also accelerate the volatilization of TVOC in the leather building materials, further improving the TVOC enrichment degree of the test samples, and thus obtaining relatively accurate test results.

[0052] As a preferred embodiment, as Figures 3 to 5 shown, the above rapid detection device further includes an elastic bladder 302. The elastic bladder 302 is made of silica gel material and is connected between the collection chamber 3 and the surface of the leather building material. The elastic bladder 302 makes the collection chamber 3 fit tightly with the surface of the leather building material.

[0053] During use, when the leather building material is genuine leather with good environmental protection performance or the second-level perforated artificial leather, when the hot air blower 401 rotates in reverse, the gas inside the leather building material will be pumped out to balance the pressure in the collection chamber 3. At this time, the elastic bladder 302 will not deform or deform slightly. When the leather building material is non-perforated artificial leather with poor environmental protection performance, due to its airtightness, a large negative pressure will be formed in the collection chamber 3, and then the elastic bladder 302 will be compressed in the form as Figure 5 shown.

[0054] Through the above technical solution, the elastic bladder 302 is used to make the collection chamber 3 fit tightly with the surface of the leather building material, which can form a negative pressure on the surface of the leather building material when the hot air blower 401 sucks the air in the collection chamber 3, and then identify whether the leather building material is genuine leather or artificial leather.

[0055] As a preferred embodiment, as Figure 4 and Figure 5 shown, several electrode columns 3021 are connected to one end of the collection chamber 3 facing the elastic bladder 302. A conductive ring 3022 is connected to the inner side of the elastic bladder 302 away from the collection chamber 3. When the collection chamber 3 moves towards the surface of the leather building material and compresses the elastic bladder 302, after the elastic bladder 302 is deformed by pressure, the electrode column 3021 contacts the conductive ring 3022. When the electrode column 3021 contacts the conductive ring 3022, the hot air blower 401 is short-circuited.

[0056] Through the above technical solution, when the leather building material is non-porous artificial leather material, it will cause the negative pressure in the collection chamber 3 to increase and then compress the elastic bladder 302, causing the electrode column 3021 and the conductive ring 3022 to contact and thus short-circuit the hot air blower 401, so that the device has the function of distinguishing between genuine leather and artificial leather.

[0057] As a preferred embodiment, the detection chamber 5 has a first detection space 501 and a second detection space 502. The first detection space 501 is connected to the PID detection module 1 and the hot air blower 401, and the second detection space 502 is connected to the electrochemical detection module 2. A nanofiltration membrane 503 is connected between the first detection space 501 and the second detection space 502, and the nanofiltration membrane 503 allows formaldehyde to pass through.

[0058] When used, the nanofiltration membrane 503 is exemplarily selected from NÜFTM nanofiltration membrane, which achieves selective permeation through membrane pore size screening and surface charge effect. Formaldehyde (molecular weight 30) can pass through the membrane pores due to its small size, while TVOC (such as benzene series, molecular weight>78) is retained. The membrane pore size is 0.5nm-2nm, which accurately screens small molecules, with a formaldehyde permeability of>90% and a TVOC retention rate of>95%.

[0059] Through the above technical solution, formaldehyde is separated from TVOC through the nanofiltration membrane 503, thereby eliminating the interference of other volatile organic gases in the formaldehyde detection process and improving the detection accuracy.

[0060] As a preferred implementation method, Figure 3 As shown, the above-mentioned rapid detection equipment also includes an air supply pipe 402 and a sample delivery pipe 403. The air supply pipe 402 connects the hot air blower 401 and the outside of the power compartment 4; the sample delivery pipe 403 connects the hot air blower 401 and the first detection space 501; the air supply pipe 402 only allows air to be sucked into the hot air blower 401 from the outside through a one-way valve, and the sample delivery pipe 403 only allows air to enter the first detection space 501 from the hot air blower 401 through a one-way valve. If necessary, an electromagnetic valve can be used to more accurately and independently control the on and off of the air supply pipe 402 and the sample delivery pipe 403.

[0061] Through the above technical solution, the water absorption of the silica gel particles 3011 can be further saturated by adopting the method of external air supply, thereby enhancing the effect of the collection chamber 3 in obtaining TVOC.

[0062] As a preferred implementation method, Figure 3 and Figure 8 As shown, the above-mentioned rapid detection equipment also includes a variable volume body 504. The exemplary variable volume body 504 adopts a rubber balloon (refer to a rubber-tipped dropper). The rubber balloon has a certain rigidity and ductility. Several variable volume bodies 504 are connected to the side wall of the second detection space 502 away from the first detection space 501.

[0063] Through the above technical solution, the variable volume body 504 is used to balance the pressure of the detection chamber 5, thereby reducing the influence of pressure fluctuations on the detection results.

[0064] As a preferred embodiment, the above-mentioned rapid detection device further includes a filter 4021, and the filter 4021 is connected inside the air supply pipe 402.

[0065] Through the above technical solution, the filter 4021 is used to improve the cleanliness of the incoming air and prevent dust from entering and affecting the detection accuracy.

[0066] This embodiment also provides a method for rapidly detecting the environmental protection performance of building materials for houses. It uses the above-mentioned rapid detection device for the environmental protection performance of building materials for houses and further includes the following steps:

[0067] Step S1: After removing the variable volume body 504, start the hot air blower 401 to rotate in reverse, so that air passes through the collection chamber 3 and enters the spiral tube 301. Wait until the silica gel particles 3011 absorb water vapor to a saturated state, reinstall the variable volume body 504, and make the variable volume body 504 pop out into the detection chamber 5;

[0068] Step S2: Press the rapid detection device for the environmental protection performance of building materials for houses against the surface of the leather building materials, and start the hot air blower 401 to rotate forward for a preset time. The hot air causes the water vapor in the silica gel particles 3011 to be fully desorbed to form humid and hot air, which fills the collection chamber 3;

[0069] Step S3: Keep the humid and hot air in the collection chamber 3 cool down to room temperature, and start the hot air blower 401 to rotate in reverse until the variable volume body 504 deforms from being sunken inward relative to the outer surface of the detection chamber 5 to protruding outward relative to the outer surface of the detection chamber 5;

[0070] Step S4: Start the PID detection module 1 to read the TVOC detection data, and start the electrochemical detection module 2 to read the formaldehyde detection data.

[0071] Through the above technical solution, the silica gel particles 3011 are used to adsorb water vapor, and the hot air blown by the hot air blower 401 is used to desorb the water vapor adsorbed by the silica gel particles 3011. Then, the humid and hot gas is used to act on the leather building materials below the collection chamber 3, improving the enrichment degree of TVOC in the gas in the collection chamber 3, and thus more accurate detection results can be obtained.

[0072] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope recorded in the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A rapid detection device for environmental performance of building materials, comprising a PID detection module (1) and an electrochemical detection module (2), characterized in that: Also includes: The collection chamber (3) is in contact with the surface of the leather building material; A detection chamber (5) connected to the PID detection module (1) and the electrochemical detection module (2); The power chamber (4) is connected between the collection chamber (3) and the detection chamber (5). The power chamber (4) has a hot air blower (401). When the hot air blower (401) rotates forward, hot air is blown into the collection chamber (3). When the hot air blower (401) rotates reversely, the gas in the collection chamber (3) is sent into the detection chamber (5).

2. The rapid detection device for environmental performance of building materials according to claim 1 is characterized in that: Also includes: The spiral tube (301) is connected between the hot air blower (401) and the collection chamber (3); the spiral tube (301) is filled with silica gel particles (3011); the silica gel particles (3011) are used to absorb water vapor in the air.

3. The rapid detection device for environmental performance of building materials according to claim 2 is characterized in that: Also includes: The elastic bag (302) is connected between the collection chamber (3) and the surface of the leather building material, and the elastic bag (302) enables the collection chamber (3) and the surface of the leather building material to fit tightly.

4. The rapid detection device for environmental performance of building materials according to claim 3 is characterized in that: A plurality of electrode columns (3021) are connected to one end of the collection chamber (3) facing the elastic capsule (302); a conductive ring (3022) is connected to the inner side of the elastic capsule (302) away from the collection chamber (3); when the collection chamber (3) moves toward the surface of the leather building material, the elastic capsule (302) is compressed; after the elastic capsule (302) is deformed under pressure, the electrode columns (3021) contact the conductive ring (3022); when the electrode columns (3021) contact the conductive ring (3022), the hot air blower (401) is short-circuited.

5. The rapid detection device for environmental performance of building materials according to claim 4 is characterized in that: The detection chamber (5) comprises a first detection space (501) and a second detection space (502); the first detection space (501) is connected to the PID detection module (1) and the hot air blower (401); the second detection space (502) is connected to the electrochemical detection module (2); a nanofiltration membrane (503) is connected between the first detection space (501) and the second detection space (502); the nanofiltration membrane (503) allows formaldehyde to pass through.

6. The rapid detection device for environmental performance of building materials according to claim 5 is characterized in that: Also includes: An air supply pipe (402) communicating with the hot air blower (401) and the outside of the power chamber (4); A sample delivery tube (403) connected to the hot air blower (401) and the first detection space (501); The air supply pipe (402) only allows air to be sucked into the hot air blower (401) from the outside, and the sample delivery pipe (403) only allows the air to enter the first detection space (501) from the hot air blower (401).

7. The rapid detection device for environmental performance of building materials according to claim 6 is characterized in that: Also includes: A plurality of variable capacitance bodies (504) are connected to a side wall of the second detection space (502) on a side facing away from the first detection space (501).

8. The rapid detection device for environmental performance of building materials according to claim 7 is characterized in that: Also includes: The filter sheet (4021) is connected to the air supply pipe (402).

9. A rapid detection method for environmental performance of building materials, characterized in that: The use of the rapid detection device for environmental performance of building materials as claimed in claim 8 further comprises the following steps: Step S1: after removing the variable volume body (504), the hot air blower (401) is started to rotate in reverse, so that air passes through the collection chamber (3) and enters the spiral tube (301). After the silica gel particles (3011) absorb water vapor to a saturated state, the variable volume body (504) is reinstalled and ejected into the detection chamber (5); Step S2: placing the housing building material environmental performance rapid testing device against the surface of the leather building material, starting the hot air blower (401) to rotate forward for a preset time, and using the hot air to fully desorb the water vapor in the silica gel particles (3011) to form moist hot air that is then filled into the collection chamber (3); Step S3: keeping the hot and humid air in the collection chamber (3) cooled to room temperature, starting the hot air blower (401) to reversely operate until the variable volume body (504) is deformed from being inwardly concave relative to the outer surface of the detection chamber (5) to being outwardly convex relative to the outer surface of the detection chamber (5); Step S4: starting the PID detection module (1) to read TVOC detection data, and starting the electrochemical detection module (2) to read formaldehyde detection data.

Images