Device and method for testing formaldehyde decomposition conversion rate of air purifier

Abstract

The invention belongs to the technical field of performance detection of air purifiers, and particularly relates to a formaldehyde decomposition conversion rate testing device and method for an air purifier, and the device comprises a testing cabin which is used for placing a testing prototype and filling formaldehyde gas; the formaldehyde gas source is communicated with the test cabin and is used for introducing formaldehyde into the test cabin; the circulation module is used for gas circulation in the test cabin; the temperature and humidity adjusting module is communicated with the test cabin, and the temperature and humidity adjusting module is matched with the circulation module to adjust the temperature and humidity of the gas; the formaldehyde concentration detection module is used for detecting the formaldehyde concentration in the test cabin; the carbon dioxide detection module is used for detecting the carbon dioxide concentration in the test cabin; and the tail gas treatment module is communicated with the test cabin and is used for treating and discharging gas in the test cabin after the test is finished. According to the invention, the formaldehyde decomposition conversion rate and the formaldehyde removal rate of the test prototype can be measured.

Description

Technical Field

[0001] The invention belongs to the technical field of air purifier performance detection, and in particular relates to a formaldehyde decomposition conversion rate test device and method for an air purifier. Background Art

[0002] At present, household air purifiers on the market mainly rely on activated carbon, catalysts and other air purification materials to physically adsorb, catalytically decompose, and amino condense formaldehyde molecules in the air to achieve air formaldehyde removal. Among them, the catalytic material can convert air formaldehyde into harmless water and carbon dioxide, preventing formaldehyde molecules from remaining inside the purifier and forming a secondary pollution source; while the single activated carbon formaldehyde physical adsorption has the risk of adsorption saturation and secondary release.

[0003] In the traditional formaldehyde removal rate test method, only the spatial removal rate of formaldehyde per unit time is considered, and it is impossible to evaluate whether the formaldehyde is adsorbed and remains inside the purifier. There is a risk that manufacturers use the formaldehyde removal rate index parameters to falsely claim that their products have the function of catalyzing the decomposition of formaldehyde.

[0004] Based on the limitations of the above-mentioned traditional formaldehyde removal rate indicators, the present invention proposes a test method for measuring the formaldehyde decomposition conversion rate of an air purifier, which can measure the formaldehyde decomposition conversion rate while detecting the formaldehyde removal rate. Summary of the invention

[0005] The purpose of the present invention is to provide a formaldehyde decomposition conversion rate test device and method for an air purifier to solve the above-mentioned problem.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] An air purifier formaldehyde decomposition conversion rate test device, comprising:

[0008] A test chamber, wherein the test chamber is used to place the test sample and to be filled with formaldehyde gas;

[0009] a formaldehyde gas source, connected to the test chamber, and used to introduce formaldehyde into the test chamber;

[0010] A circulation module, used for gas circulation in the test chamber;

[0011] A temperature and humidity regulating module is connected to the test chamber, and cooperates with the circulation module to regulate the temperature and humidity of the gas;

[0012] A formaldehyde concentration detection module, used to detect the formaldehyde concentration in the test chamber;

[0013] A carbon dioxide detection module, used to detect the carbon dioxide concentration in the test chamber;

[0014] The tail gas treatment module is connected to the test chamber and is used for treating and discharging the gas in the test chamber after the test is completed.

[0015] Optionally, the formaldehyde gas source includes a formaldehyde gas generating device, which is fixedly connected in the test chamber and is used to generate formaldehyde gas.

[0016] Optionally, the formaldehyde concentration detection module includes a formaldehyde gas concentration detection device, which is fixedly connected in the test chamber and is used to detect formaldehyde concentration.

[0017] Optionally, the carbon dioxide detection module includes a carbon dioxide gas concentration detection device, which is fixed in the test chamber and is used to detect carbon dioxide concentration.

[0018] Optionally, a stirring fan is rotatably connected to the inner side of the top of the test chamber, and the stirring fan is used to stir and mix the gas in the test chamber.

[0019] Optionally, the temperature and humidity adjustment module includes a box body, the box body is connected to the bottom of the test chamber through a return air duct, and the box body is connected to the top of the test chamber through an air supply duct;

[0020] The temperature and humidity adjustment module is connected with a heater for temperature adjustment, a humidifier for increasing humidity, and an evaporator for reducing humidity;

[0021] A temperature and humidity sensor is fixedly connected in the test chamber.

[0022] Optionally, the circulation module includes a circulation fan, and the circulation fan is connected and arranged in the middle of the return air duct.

[0023] Optionally, the exhaust gas treatment module includes an air inlet and an air exhaust, wherein the air inlet is connected to one side of the bottom of the test chamber, and the air exhaust is connected to the top of the test chamber.

[0024] Optionally, the air inlet portion includes an air inlet pipe connected to the test chamber, and one end of the air inlet pipe away from the test chamber is connected to a first air purification component;

[0025] The exhaust part comprises an exhaust pipe connected to the test chamber, and one end of the exhaust pipe away from the test chamber is connected to a second air purification component and an exhaust fan in sequence.

[0026] A method for testing the formaldehyde decomposition conversion rate of an air purifier, using the above-mentioned test device for testing the formaldehyde decomposition conversion rate of an air purifier, comprises the following steps:

[0027] Placing the test prototype in the test chamber;

[0028] Using the circulation module and the temperature and humidity adjustment module to adjust the temperature and humidity in the test chamber;

[0029] The formaldehyde gas source generates formaldehyde in the test chamber;

[0030] Recording the initial formaldehyde gas concentration value and the carbon dioxide gas concentration value by the formaldehyde concentration detection module and the carbon dioxide detection module;

[0031] Running the test prototype purification function;

[0032] After the test sample is purified, the formaldehyde gas concentration value and the carbon dioxide gas concentration value at the end of purification are detected and recorded;

[0033] Using an exhaust gas treatment module to purify and discharge the gas in the test chamber;

[0034] Calculate the formaldehyde decomposition conversion rate and formaldehyde removal rate.

[0035] Compared with the prior art, the present invention has the following advantages and technical effects:

[0036] When in use, place the test prototype in the test chamber; use the circulation module and the temperature and humidity adjustment module to adjust the temperature and humidity in the test chamber; after the temperature and humidity are constant, generate formaldehyde in the test chamber through the formaldehyde gas source, and record the initial formaldehyde gas concentration value and carbon dioxide gas concentration value through the formaldehyde concentration detection module and the carbon dioxide detection module, run the purification function of the test prototype for a specified period of time, detect and record the formaldehyde gas concentration value and carbon dioxide gas concentration value when the purification ends, use the exhaust gas treatment module to purify and discharge the gas in the test chamber, calculate the formaldehyde decomposition conversion rate and the formaldehyde removal rate, and the formaldehyde removal rate and the formaldehyde decomposition rate of the test prototype can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0038] Figure 1 It is a schematic diagram of the structure of the present invention;

[0039] Figure 2 It is a flow chart of the test method of the present invention;

[0040] Among them, 001, test chamber; 002, stirring fan; 003, formaldehyde gas generating device; 004, carbon dioxide gas concentration detection device; 005, temperature and humidity sensor; 006, test prototype; 007, air inlet duct; 008, first air purification component; 009, return air duct; 010, circulating fan; 011, temperature and humidity adjustment module; 012, evaporator; 013, humidifier; 014, heater; 015, air supply duct; 016, exhaust duct; 017, second air purification component; 018, exhaust fan; 019, formaldehyde gas concentration detection device. DETAILED DESCRIPTION

[0041] The commonly used formaldehyde purification performance indicators of domestic air purifier products are usually formaldehyde clean air volume and formaldehyde removal rate. Among them, the formaldehyde clean air volume indicator is mainly tested in accordance with the national standard GB / T 18801 "Air Purifier" product standard. A certain concentration of formaldehyde gas is placed in the specified closed test chamber. By detecting the formaldehyde concentration at different purification times, the formaldehyde clean air volume value is converted. This indicator represents the rate of formaldehyde purification of air volume per unit time; while the formaldehyde removal rate indicator is mainly based on the enterprise method standard. A certain concentration of formaldehyde gas is also placed in the closed test chamber. The formaldehyde purification values ​​before and after 1 hour or other purification time are detected, and the formaldehyde removal rate value is calculated.

[0042] The formaldehyde clean air volume and formaldehyde removal rate both reflect the ability of air purifier products to purify and remove formaldehyde gas in the air, and do not take into account the treatment method of formaldehyde gas molecules by the internal filter of the purifier. Traditional air formaldehyde purification technology mainly relies on adsorption materials such as activated carbon to adsorb air formaldehyde gas molecules to achieve the effect of air formaldehyde removal. Although this technology is low-cost, there is a risk of secondary release of adsorption saturation; in recent years, domestic mainstream air purifier manufacturers have gradually adopted catalytic decomposition composite materials with strong oxidizing properties such as manganese dioxide to replace the traditional single activated carbon physical adsorption material, and decompose air formaldehyde into harmless water and carbon dioxide through catalytic reaction. The catalytic decomposition of formaldehyde has better removal effect and has the advantages of long life and no residue. Most domestic mainstream manufacturers have applied this technology to replace the traditional single activated carbon adsorption technology, but this technology has high consumables and R&D costs, and the catalytic decomposition material is similar to the activated carbon material in appearance and color. There is a risk that some manufacturers use indicators such as formaldehyde removal rate to falsely advertise that their products have formaldehyde catalytic decomposition function.

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Reference Figure 1 to Figure 2 The present invention discloses a formaldehyde decomposition conversion rate test device for an air purifier, comprising:

[0046] Test chamber 001, which is used to place the test sample 006 and fill it with formaldehyde gas;

[0047] A formaldehyde gas source is connected to the test chamber 001, and the formaldehyde gas source is used to introduce formaldehyde into the test chamber 001;

[0048] Circulation module, used for gas circulation in test chamber 001;

[0049] The temperature and humidity regulating module 011 is connected to the test chamber 001, and the temperature and humidity regulating module 011 cooperates with the circulation module to regulate the temperature and humidity of the gas;

[0050] Formaldehyde concentration detection module, used to detect the formaldehyde concentration in test chamber 001;

[0051] Carbon dioxide detection module, used to detect the carbon dioxide concentration in test chamber 001;

[0052] The exhaust gas treatment module is connected to the test chamber 001 and is used for gas treatment and discharge in the test chamber 001 after the test is completed.

[0053] When in use, the test prototype 006 is placed in the test chamber 001; the temperature and humidity in the test chamber 001 are adjusted using the circulation module and the temperature and humidity adjustment module 011; after the temperature and humidity are constant, formaldehyde is generated in the test chamber 001 through the formaldehyde gas source, and the initial formaldehyde gas concentration value and the carbon dioxide gas concentration value are recorded through the formaldehyde concentration detection module and the carbon dioxide detection module, the purification function of the test prototype 006 is run for a specified period of time, the formaldehyde gas concentration value and the carbon dioxide gas concentration value when the purification ends are detected and recorded, the exhaust gas treatment module is used to purify and discharge the gas in the test chamber 001, the formaldehyde decomposition conversion rate and the formaldehyde removal rate are calculated, and the formaldehyde removal rate and the formaldehyde decomposition rate of the test prototype 006 can be obtained.

[0054] The volume of the test chamber 001 in this embodiment is a typical value of 3m3 , 10m can be selected according to test requirements 3 、30m 3 For other volume and size specifications, test chamber 001 shall meet the technical requirements specified in QB / T 5364.

[0055] As an optional implementation, the formaldehyde gas source includes a formaldehyde gas generating device 003, the formaldehyde gas generating device 003 is fixedly connected in the test chamber 001, and the formaldehyde gas generating device 003 is used to generate formaldehyde gas.

[0056] As an optional implementation, the formaldehyde concentration detection module includes a formaldehyde gas concentration detection device 019. The formaldehyde gas concentration detection device 019 is fixedly connected in the test chamber 001. The formaldehyde gas concentration detection device 019 is used to detect the formaldehyde concentration.

[0057] As an optional implementation, the carbon dioxide detection module includes a carbon dioxide gas concentration detection device 004, which is fixedly connected to the test chamber 001 and is used to detect carbon dioxide concentration.

[0058] The detection accuracy of the carbon dioxide gas concentration detection device 004 and the formaldehyde gas concentration detection device 019 should be at least 1 ppm and 0.01 ppm respectively.

[0059] As an optional implementation, a stirring fan 002 is rotatably connected to the inner side of the top of the test chamber 001 , and the stirring fan 002 is used to stir and mix the gas in the test chamber 001 .

[0060] As an optional implementation, the temperature and humidity adjustment module 011 includes a box body, which is connected to the bottom of the test chamber 001 through the return air duct 009, and is connected to the top of the test chamber 001 through the supply air duct 015;

[0061] The temperature and humidity adjustment module 011 is connected with a heater 014 for temperature adjustment, a humidifier 013 for increasing humidity, and an evaporator 012 for reducing humidity;

[0062] A temperature and humidity sensor 005 is fixedly connected in the test chamber 001.

[0063] As an optional implementation, the circulation module includes a circulation fan 010 , and the circulation fan 010 is connected and arranged in the middle of the return air duct 009 .

[0064] As an optional implementation, the exhaust gas treatment module includes an air inlet and an air exhaust. The air inlet is connected and arranged on one side of the bottom of the test chamber 001, and the air exhaust is connected and arranged on the top of the test chamber 001.

[0065] The air inlet duct 007, the return air duct 009, the air supply duct 015, and the exhaust duct 016 are connected to the test cabin 001, and a pipe valve is built in to open and close the front and rear air paths of the pipes. The temperature and humidity adjustment module 011 is composed of an evaporator 012, a humidifier 013, a heater 014, a return air duct 009, a circulating fan 010, an air supply duct 015, and a temperature and humidity sensor 005. The temperature and humidity adjustment module 011 has a PID dynamic feedback control function, and can circulate the air in the cabin through the return air duct 009, the air supply duct 015, and the circulating fan 010 according to the preset temperature and relative humidity. Combined with the temperature and humidity sensor 005 to monitor the cabin air temperature and relative humidity in real time and the PID dynamic feedback control function of the temperature and humidity adjustment module 011, the operating power of the three components of the evaporator 012, the humidifier 013, and the heater 014 is adjusted in real time, thereby realizing the adjustment and control of the cabin air temperature and relative humidity of the test cabin 001.

[0066] As an additional implementation method, a carbon dioxide background removal module is connected to the middle of the air supply pipe 015 to remove the carbon dioxide gas in the test chamber 001.

[0067] Before the test, the carbon dioxide gas in the test chamber 001 is removed by the carbon dioxide background removal module to reduce the carbon dioxide background value, thereby making the carbon dioxide concentration value detected by the carbon dioxide gas concentration detection device 004 more accurate.

[0068] The carbon dioxide background removal module can use hollow fiber degassing membranes, alkaline adsorbents and other materials to achieve physical adsorption separation of carbon dioxide gas in the cabin air or chemical reaction absorption separation of alkaline materials.

[0069] As an optional embodiment, the air inlet portion includes an air inlet pipe 007 connected to the test chamber 001, and one end of the air inlet pipe 007 away from the test chamber 001 is connected to a first air purification component 008;

[0070] The exhaust part includes an exhaust pipe 016 connected to the test chamber 001, and one end of the exhaust pipe 016 away from the test chamber 001 is connected to a second air purification component 017 and an exhaust fan 018 in sequence.

[0071] The first air purification component 008 and the second air purification component 017 are both composed of HEPA high-efficiency air filters, gaseous pollutant adsorption catalytic decomposition materials, etc., and are used to purify and remove particulate matter, formaldehyde, TVOC and other air pollutants in the air.

[0072] When the exhaust fan 018 is running, the air inlet pipe 007 is used to take in air, and the first air purification component 008 can prevent harmful substances in the test chamber 001 from escaping.

[0073] A method for testing the formaldehyde decomposition conversion rate of an air purifier, using the above-mentioned test device for testing the formaldehyde decomposition conversion rate of an air purifier, comprises the following steps:

[0074] Place the test sample 006 in the test chamber 001;

[0075] Use the circulation module and the temperature and humidity adjustment module 011 to adjust the temperature and humidity in the test chamber 001;

[0076] The formaldehyde gas source generates formaldehyde in the test chamber 001;

[0077] The initial formaldehyde gas concentration value and the carbon dioxide gas concentration value are recorded by the formaldehyde concentration detection module and the carbon dioxide detection module;

[0078] Run the purification function of the test prototype 006;

[0079] After the purification of the test sample 006 is completed, the formaldehyde gas concentration value and the carbon dioxide gas concentration value at the end of the purification are detected and recorded;

[0080] Use the tail gas treatment module to purify and discharge the gas in the test chamber 001;

[0081] Calculate the formaldehyde decomposition conversion rate and formaldehyde removal rate.

[0082] Process and control the air background in the test cabin 001, open the valves of the air inlet duct 007 and the exhaust duct 016, run the exhaust fan 018, and reduce the air particulate matter and gaseous pollutants in the test cabin to the limit requirements specified in the national standard GB / T18883 indoor air quality standard. Then, turn off the exhaust fan 018, close the valves of the air inlet duct 007 and the exhaust duct 016, and proceed to the next step.

[0083] The temperature and humidity in the test cabin 001 are regulated and controlled, the return air duct 009 and the supply air duct 015 valves are opened, the circulating fan 010, the temperature and humidity adjustment module 011, the evaporator 012, the humidifier 013, the heater 014 and the temperature and humidity sensor 005 are turned on, and the control target range of the cabin temperature and relative humidity of the test cabin 001 is set. The typical value ranges of the cabin temperature and relative humidity tests are (23±2)℃ and (50±10)%, respectively. When the temperature and relative humidity are stable in the control target range, turn off the circulating fan 010, the temperature and humidity adjustment module 011, the evaporator 012, the humidifier 013 and the heater 014, close the return air duct 009 and the supply air duct 015 valves, and proceed to the next step.

[0084] Formaldehyde gas is generated in the test chamber 001, and the formaldehyde gas generating device 003 and the stirring fan 002 are turned on. Optionally, the amount of formaldehyde gas generated in this embodiment is 600 mg. After the formaldehyde gas is generated, the stirring fan 002 is turned off. After the stirring fan 002 stops rotating, the next step is performed.

[0085] Turn on the carbon dioxide gas concentration detection device 004 and the formaldehyde gas concentration detection device 019, detect and record the initial formaldehyde gas and carbon dioxide gas concentrations, and then proceed to the next step.

[0086] Run the purification function of the test sample 006. Optionally, the purification time of the test in this embodiment is 2 hours. After the purification time reaches 2 hours, turn off the purification function of the test sample 006 and proceed to the next step.

[0087] Turn on the carbon dioxide gas concentration detection device 004 and the formaldehyde gas concentration detection device 019, detect and record the termination of the formaldehyde gas and carbon dioxide gas concentrations, and then proceed to the next step.

[0088] Purify and exhaust the air in test cabin 001, open the valves of air inlet duct 007 and exhaust duct 016, run exhaust fan 018, and after the particulate matter and gaseous pollutants in the test cabin air are reduced to the limit requirements specified in the national standard GB / T18883 indoor air quality standard, turn off exhaust fan 018, and close the valves of air inlet duct 007 and exhaust duct 016.

[0089] Calculate the formaldehyde decomposition conversion rate. Based on the reaction mechanism that 1 mol of formaldehyde and 1 mol of oxygen generate 1 mol of carbon dioxide and 1 mol of water under catalytic reaction conditions, the difference between the initial concentration and the final concentration of formaldehyde gas and the difference between the initial concentration and the final concentration of carbon dioxide gas can be calculated through steps S4 and S6. The percentage of the difference in carbon dioxide gas concentration to the difference in formaldehyde gas concentration is the formaldehyde decomposition conversion rate. Calculate the formaldehyde removal rate. The difference between the initial concentration and the final concentration of formaldehyde gas can be calculated through steps S4 and S6. The percentage of the difference in formaldehyde gas concentration to the initial concentration of formaldehyde gas is the formaldehyde removal rate.

[0090] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 understood as a limitation on the present invention.

[0091] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An air purifier formaldehyde decomposition conversion rate test device, characterized in that: include: A test chamber (001), wherein the test chamber (001) is used to place a test sample (006) and to be filled with formaldehyde gas; A formaldehyde gas source is connected to the test chamber (001), and the formaldehyde gas source is used to introduce formaldehyde into the test chamber (001); A circulation module, used for gas circulation in the test chamber (001); A temperature and humidity regulating module (011) is connected to the test chamber (001), and the temperature and humidity regulating module (011) cooperates with the circulation module to regulate the temperature and humidity of the gas; A formaldehyde concentration detection module, used for detecting the formaldehyde concentration in the test chamber (001); A carbon dioxide detection module, used for detecting the concentration of carbon dioxide in the test chamber (001); The tail gas treatment module is connected to the test chamber (001) and is used for treating and discharging the gas in the test chamber (001) after the test is completed.

2. The formaldehyde decomposition conversion rate test device for an air purifier according to claim 1, characterized in that: The formaldehyde gas source comprises a formaldehyde gas generating device (003), the formaldehyde gas generating device (003) is fixedly connected in the test chamber (001), and the formaldehyde gas generating device (003) is used to generate formaldehyde gas.

3. The formaldehyde decomposition conversion rate test device for an air purifier according to claim 1, characterized in that: The formaldehyde concentration detection module comprises a formaldehyde gas concentration detection device (019), the formaldehyde gas concentration detection device (019) is fixedly connected in the test chamber (001), and the formaldehyde gas concentration detection device (019) is used to detect formaldehyde concentration.

4. The formaldehyde decomposition conversion rate test device for an air purifier according to claim 1, characterized in that: The carbon dioxide detection module comprises a carbon dioxide gas concentration detection device (004), the carbon dioxide gas concentration detection device (004) is fixedly connected in the test chamber (001), and the carbon dioxide gas concentration detection device (004) is used to detect carbon dioxide concentration.

5. The formaldehyde decomposition conversion rate test device for an air purifier according to claim 1, characterized in that: A stirring fan (002) is rotatably connected to the inner side of the top of the test chamber (001), and the stirring fan (002) is used to stir and mix the gas in the test chamber (001).

6. The formaldehyde decomposition conversion rate test device for an air purifier according to claim 1, characterized in that: The temperature and humidity adjustment module (011) comprises a box body, the box body is connected to the bottom of the test chamber (001) through a return air duct (009), and the box body is connected to the top of the test chamber (001) through an air supply duct (015); The temperature and humidity adjustment module (011) is internally connected with a heater (014) for temperature adjustment, a humidifier (013) for increasing humidity, and an evaporator (012) for reducing humidity; A temperature and humidity sensor (005) is fixedly connected in the test chamber (001).

7. The formaldehyde decomposition conversion rate test device for an air purifier according to claim 6, characterized in that: The circulation module comprises a circulation fan (010), and the circulation fan (010) is arranged in communication with the middle part of the return air duct (009).

8. The formaldehyde decomposition conversion rate test device for an air purifier according to claim 1, characterized in that: The exhaust gas treatment module comprises an air inlet and an air exhaust. The air inlet is arranged on one side of the bottom of the test chamber (001) and is connected to the top of the test chamber (001).

9. The formaldehyde decomposition conversion rate test device for an air purifier according to claim 8, characterized in that: The air inlet portion comprises an air inlet pipe (007) connected to the test chamber (001), and one end of the air inlet pipe (007) away from the test chamber (001) is connected to a first air purification component (008); The exhaust part comprises an exhaust pipe (016) connected to the test chamber (001), and one end of the exhaust pipe (016) away from the test chamber (001) is connected in sequence to a second air purification component (017) and an exhaust fan (018).

10. A method for testing the formaldehyde decomposition conversion rate of an air purifier, using the test device for the formaldehyde decomposition conversion rate of an air purifier according to any one of claims 1 to 9, characterized in that: The steps include: Placing the test prototype (006) in the test chamber (001); Using the circulation module and the temperature and humidity adjustment module (011) to adjust the temperature and humidity in the test chamber (001); The formaldehyde gas source generates formaldehyde in the test chamber (001); Recording the initial formaldehyde gas concentration value and the carbon dioxide gas concentration value by the formaldehyde concentration detection module and the carbon dioxide detection module; Running the purification function of the test prototype (006); After the purification of the test sample (006) is completed, the formaldehyde gas concentration value and the carbon dioxide gas concentration value at the end of the purification are detected and recorded; Using an exhaust gas treatment module to purify and discharge the gas in the test chamber (001); Calculate the formaldehyde decomposition conversion rate and formaldehyde removal rate.

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