A testing device and method for deozone performance of air purifier

Abstract

The present disclosure provides a test device and method for the deozonation performance of an air purifier, the test device comprising: a test chamber for accommodating the air purifier to be tested, simulating the actual indoor use environment; an ozone generator, the ozone generator is connected to the air inlet of the test chamber, and is used to continuously deliver ozone into the test chamber; and an exhaust purification device, the exhaust purification device is connected to the exhaust port of the test chamber, and the exhaust purification device is connected to the outdoors. The present disclosure can meet the requirements of the dynamic balance method, provide continuous generation of pollutants and dynamic balance tests, and are closer to the working conditions of the actual indoor environment, and can truly and objectively reflect the deozonation performance of the air purifier.

Description

Technical Field

[0001] The present disclosure relates to the field of air purifier performance testing, and in particular to a device and method for testing the ozone removal performance of an air purifier. Background Art

[0002] In recent years, ozone pollution has become a growing problem in my country, with concentrations rising annually. Especially during the hot summer months, ozone (O3) often overtakes PM2.5, becoming a significant source of air pollution. According to the 2019 China Ecological Environment Bulletin, days with O3 as the primary pollutant exceeding the standard accounted for 41.8% of all days, second only to PM2.5, which exceeded the standard at 45%. Compared to PM2.5, ozone pollution is more insidious because clear, cloudless, and windless days accelerate photochemical reactions, causing ozone concentrations to exceed the standard. Ozone is irritating and damaging to the eyes and respiratory tract. Prolonged exposure can significantly impair lung function, cause inflammation, and even lead to death. Ozone can also react chemically with indoor organic matter to produce carcinogens such as formaldehyde and acrolein, carboxylic acid irritants, and secondary pollutants such as organic aerosols containing free radicals. Therefore, strict control of indoor ozone concentrations is necessary.

[0003] Air purifiers are effective at removing pollutants such as PM2.5. With the revision and implementation of GB / T 18801-2015 "Air Purifiers," product quality has significantly improved, and purification functions have become more diverse. While the current standard specifies purification performance test methods for gaseous pollutants, such as Clean Air Delivery Rate (CADR) and Cumulative Cleaning Volume (CCM), ozone in actual indoor environments is continuously input or generated. The standard's pollutant generation method, which requires a single injection to the required initial concentration, deviates from the actual state of the pollutants. O3 is a gaseous pollutant that decomposes at room temperature. The standard uses a "single injection not exceeding 100 times the limit" method for gaseous pollutant CCM testing. However, ozone naturally decomposes more significantly at high concentrations, severely interfering with air purifier ozone performance testing. Therefore, the current gaseous pollutant purification performance test method is not suitable for evaluating air purifier ozone removal performance. In addition, no other data have been found reporting evaluation methods for this type of ozone purification performance, which has brought great trouble to the research and development and application of air purifiers with ozone removal functions, hindering people from responding to the increasingly prevalent ozone pollutants in a timely manner and affecting human health and development. Summary of the Invention

[0004] (1) Technical issues to be solved

[0005] The present disclosure provides a device and method for testing the ozone removal performance of an air purifier to at least partially solve the technical problems raised above.

[0006] (2) Technical solution

[0007] According to one aspect of the present disclosure, a device for testing the ozone removal performance of an air purifier is provided, comprising:

[0008] The test chamber is used to accommodate the air purifier to be tested and simulate the actual indoor use environment;

[0009] an ozone generator, the ozone generator being connected to the air inlet of the test chamber and being used to continuously deliver ozone into the test chamber; and

[0010] An exhaust purification device is connected to the exhaust port of the test chamber and is connected to the outside of the room.

[0011] According to an embodiment of the present disclosure, the ozone generating device includes a fan, a pollutant delivery port, an air volume measuring device and an upstream sampling port connected in sequence, wherein:

[0012] The fan is used to provide air supply power, transport ozone into the test chamber, and adjust the transport flow rate;

[0013] The pollutant injection port is set at the connection between the fan and the test chamber for injecting ozone;

[0014] The air volume measuring device is arranged downstream of the fan and is used to measure the air volume provided by the fan;

[0015] The upstream sampling port is used to measure the ozone concentration at the air inlet of the test chamber.

[0016] According to an embodiment of the present disclosure, the testing device further includes:

[0017] A filter comprising a particulate matter purification device and a gaseous pollutant removal device for purifying the background concentration in the test chamber; or

[0018] The pure gas source is used to connect to the gas source port of the ozone generator to provide gas source.

[0019] According to an embodiment of the present disclosure, the ozone generating device further includes a humidity regulator for adjusting the humidity of the gas delivered to the test chamber.

[0020] According to an embodiment of the present disclosure, the test chamber includes a test chamber body, an air flow control device, a transmission device, an air inlet valve, an air exhaust valve, a sampling point and a temperature and humidity adjustment device, wherein:

[0021] The test chamber body is used to accommodate the air purifier to be tested, forming a closed test environment;

[0022] The airflow control device is used to control the uniform mixing of ozone and airflow;

[0023] The conveying device includes a liftable movable platform on which the air purifier to be tested is placed, and is used to adjust the position of the air purifier to be tested, so that the test personnel do not need to enter the test chamber to operate, thereby avoiding affecting the test personnel and the test;

[0024] The air inlet valve is arranged at the air inlet of the test chamber and is used to realize the opening and closing of the connection between the test chamber and the ozone generator;

[0025] The exhaust valve is provided at the air outlet of the test chamber and is used to open and close the connection between the test chamber and the exhaust purification device;

[0026] The sampling point is provided in the test chamber and is used to collect the gas concentration in the test chamber;

[0027] The temperature and humidity regulating device is arranged in the test chamber and is used to regulate the temperature and humidity of the test chamber to predetermined values.

[0028] According to an embodiment of the present disclosure, the conveying device can realize the mutual conveyance of the air purifier between the operating window of the test chamber and the designated test position.

[0029] According to an embodiment of the present disclosure, the airflow control device includes:

[0030] A stirring fan, which is provided at the air inlet of the test chamber and is used to evenly mix the gas output by the ozone generator; and

[0031] A circulation fan is used to ensure that the airflow in the test chamber is fully mixed during the test.

[0032] According to an embodiment of the present disclosure, the inner wall of the test chamber body is made of a material that is resistant to ozone oxidation corrosion.

[0033] According to an embodiment of the present disclosure, the exhaust purification device includes a downstream sampling port for measuring the ozone concentration at the air outlet of the test chamber.

[0034] According to another aspect of the present disclosure, a method for testing the ozone removal performance of an air purifier using the aforementioned testing device is provided, comprising:

[0035] The air purifier to be tested is fixed in the test chamber and the ozone natural attenuation coefficient test is completed under predetermined conditions;

[0036] Inputting ozone into the test chamber at a predetermined concentration, and turning on the air purifier to be tested when the ozone concentration at the exhaust port of the test chamber stabilizes;

[0037] Ozone is continuously input into the test chamber at a predetermined concentration. When the cumulative amount of ozone gas continuously introduced from the upstream reaches a limit, or the concentration at the test chamber exhaust port reaches the same as the ozone concentration introduced at the test chamber inlet, the air purifier and the ozone generator are turned off, and the cumulative ozone purification amount and the clean air volume are calculated.

[0038] According to an embodiment of the present disclosure, fixing the air purifier to be tested in a test chamber and completing the ozone natural attenuation coefficient test under predetermined conditions includes:

[0039] The air purifier to be tested is fixed on the conveyor in the test chamber. The air purifier to be tested is in the off state during the natural attenuation coefficient test.

[0040] Turn on the temperature and humidity control device of the test chamber, and turn on the fan of the ozone generator to reduce the background pollutant concentration in the test chamber. Wait until the background concentration, temperature and relative humidity in the test chamber reach the specified state;

[0041] Turn on the stirring fan and the circulation fan, open the ozone generator and the air inlet and exhaust valves of the test chamber, and continuously and stably introduce a gaseous concentration of (0.48±0.04) mg / m 3 ozone, and continuously monitor the ozone concentration and air volume at the air inlet of the test chamber, as well as the ozone concentration at the air outlet;

[0042] Continuously monitor the ozone concentration at the exhaust outlet. When the ozone concentration at the exhaust outlet does not change by more than 5% within a predetermined period of time, the test chamber is in an upper stable state. Record the ozone concentration within half an hour and take the average value as C0.

[0043] Calculate the natural attenuation coefficient K e ,include:

[0044] The mass transfer process of ozone pollutants in the cabin satisfies the law of mass conservation:

[0045]

[0046] Where:

[0047] C - pollutant concentration in the test chamber, in milligrams per cubic meter;

[0048] C in - the ozone concentration continuously and constantly released into the air inlet during the test, in milligrams per cubic meter;

[0049] Q in ——Air volume at the test chamber inlet, in cubic meters per hour;

[0050] k0——natural deposition rate of pollutants, in hours;

[0051] k——the number of air changes in the test chamber, in hours;

[0052] V——test chamber volume, in cubic meters;

[0053] Q – the amount of clean air the purifier removes ozone, in cubic meters per hour;

[0054] When the test chamber is in the upper stable state, dC / dt = 0 and CADR = 0, so the natural attenuation constant is:

[0055]

[0056] Where:

[0057] C0 - the concentration of pollutants in the test chamber at the upper steady state, in milligrams per cubic meter;

[0058] Perform total attenuation testing, including:

[0059] The step of inputting ozone into the test chamber at a predetermined concentration and starting the air purifier to be tested after the ozone concentration at the exhaust port of the test chamber stabilizes comprises:

[0060] After the natural attenuation coefficient is completed, the sample to be tested is turned on to the rated state, and the time of turning on is recorded as t = 0h;

[0061] Keep the stirring fan and circulation fan turned on, and the air inlet of the test chamber is still steadily flowing with a concentration of (0.48±0.04) mg / m 3 ozone, and continuously monitor the ozone concentration at the exhaust vent of the test chamber. Record the data once every predetermined time, including the air volume at the air inlet, the pollutant concentration at the air inlet, and the pollutant concentration at the exhaust vent. When the ozone concentration at the exhaust vent drops to a value within a predetermined time range of no more than 5%, the test chamber is in the lower stable state for the first time. Record the ozone concentration within half an hour, and take the average value as the concentration Ct of the lower stable state.

[0062] Calculate the ozone clean air volume of the test sample, including:

[0063] When the test chamber is in the upper stable state, dC / dt in Formula 1 = 0, and the clean air volume of the test sample after removing ozone is obtained:

[0064]

[0065] Where:

[0066] C t - The concentration of pollutants in the test chamber at the lower steady state, in milligrams per cubic meter;

[0067] Conduct cumulative purification test, including:

[0068] The test ends when the cumulative amount of ozone gas continuously introduced into the air inlet reaches the cumulative purification amount limit corresponding to the clean air volume set for the target pollutant, or when the lower steady-state concentration exceeds the predetermined limit, whichever comes first.

[0069] Calculate the cumulative amount of ozone purification;

[0070]

[0071] Where:

[0072] C out，n - During the test, starting from t = 0h after the test sample is put into operation, the real-time ozone concentration at the exhaust outlet at time n is expressed in milligrams per cubic meter;

[0073] q - air change volume in the cabin per hour, in cubic meters per hour;

[0074] t——time when the test ends, in hours;

[0075] Δt is the time step of each ozone concentration recorded by the ozone instrument, in hours;

[0076] k e ——Total decay constant, in hours.

[0077] (3) Beneficial effects

[0078] It can be seen from the above technical solutions that the device and method for testing the ozone removal performance of an air purifier disclosed herein have at least one of the following beneficial effects:

[0079] (1) The test device and method for the ozone removal performance of an air purifier disclosed in the present invention fully consider the actual indoor environment and the distribution characteristics of ozone pollutants. The dynamic balance method is used to load the initial pollutant concentration, which is closer to the working conditions of the actual indoor environment and can truly reflect the ozone removal performance of the air purifier.

[0080] (2) The test device and method for the ozone removal performance of the air purifier disclosed in the present invention are reasonably designed, simulating the phenomenon of continuous ozone generation in an actual environment, and taking into account the characteristic that ozone is easily decomposed, scientifically and objectively evaluating the ozone removal performance of the air purifier.

[0081] (3) Based on the test results of the public test method, the removal principle, structure and operation mode of the ozone removal air purifier are optimized and designed to further improve the use effect and purification energy efficiency of the air purifier;

[0082] (4) The test device and method for the ozone removal performance of the air purifier disclosed in the present invention can provide a scientific basis for enterprise product research and development, quality management, and market development, and can guide the formulation and revision of enterprise standards, group standards, and industry standards, and has positive social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 This is a schematic diagram of the structure of a testing device for the ozone removal performance of an air purifier according to an embodiment of the present disclosure.

[0084] Figure 2 Schematic diagram of the change in ozone concentration during the air purifier testing phase in the test method for the ozone removal performance of an air purifier according to an embodiment of the present disclosure.

[0085] [Description of the main component symbols of the embodiment of the present disclosure in the accompanying drawings]

[0086] 10-Ozone generator; 20-Test chamber; 30-Exhaust purification device; 11-High-efficiency filter; 12-Activated carbon filter; 13-Fan; 14-Pollutant delivery port; 15-Air volume measuring device; 16-Upstream sampling port; 21-Test chamber body; 22-Air flow control device; 221-Stirring fan; 222-Circulation fan; 23-Conveying device; 24-Inlet valve; 25-Exhaust valve; 31-Downstream sampling port. DETAILED DESCRIPTION

[0087] The present disclosure provides a test device for the ozone removal performance of an air purifier, comprising: a test chamber for accommodating the air purifier to be tested and simulating an actual indoor use environment; an ozone generator, the ozone generator being connected to the air inlet of the test chamber and being used to continuously deliver ozone into the test chamber; and an exhaust purification device, the exhaust purification device being connected to the exhaust outlet of the test chamber and connected to the outdoors.

[0088] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0089] Certain embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, some, but not all, of which embodiments are shown. Indeed, the various embodiments of the present disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

[0090] In an exemplary embodiment of the present disclosure, a device for testing the ozone removal performance of an air purifier is provided.

[0091] Figure 1This is a schematic diagram of the structure of the test device for the ozone removal performance of the air purifier according to the embodiment of the present disclosure. Figure 1 As shown, the test device for the ozone removal performance of an air purifier disclosed herein includes: an ozone generator 10, a test chamber 20, and an exhaust purification device 30. The ozone generator 10 is connected to the air inlet (upstream) of the test chamber 20, and the exhaust outlet (downstream) of the test chamber 20 is connected to the exhaust purification device 30, which is connected to the outside of the room. The exhaust purification device 30 includes a downstream sampling port 31 for measuring the ozone concentration at the air outlet of the test chamber 20.

[0092] The ozone generator 10 includes a high-efficiency filter 11, an activated carbon filter 12, a fan 13, a pollutant delivery port 14, an air volume measurement device 15, and an upstream sampling port 16, which are connected in sequence. After entering the air source, air first passes through the high-efficiency filter 11 and the activated carbon filter 12. The high-efficiency filter 11 and the activated carbon filter 12 are used to purify the background concentration in the test chamber 20. The high-efficiency filter 11 is used to filter and remove particulate matter, and the activated carbon filter 12 is used to remove gaseous pollutants. The fan 13 is used to provide air supply power, transport ozone into the test chamber 20, and adjust the delivery flow rate. The pollutant delivery port 14 is located at the connection between the fan 13 and the test chamber 20 and is used to deliver ozone. The air volume measurement device 15 is located downstream of the fan 13 and is used to measure the air volume provided by the fan 13. The upstream sampling port 16 is used to measure the ozone concentration at the air inlet (upstream) of the test chamber 20.

[0093] The test chamber 20 includes a test chamber body 21, an air flow control device 22, a conveying device 23, an air inlet valve 24, an exhaust valve 25, a sampling point and a temperature and humidity control device (not shown). Among them, the test chamber body 21 is used to accommodate the air purifier to be tested, forming a closed test environment; the air flow control device 22 includes a stirring fan 221 and a circulation fan 222. The stirring fan 221 is used to evenly mix the target pollutants; the circulation fan 222 is used to ensure that the air flow in the test chamber is fully mixed during the test; the conveying device 23 includes a liftable movable platform 23 for placing the air purifier to be tested, which is used to adjust the position of the air purifier to be tested, so that the test personnel do not need to enter the test chamber to operate, avoiding the impact on the test personnel and the test. The air inlet valve 24 is set at the air inlet of the test chamber 20, that is, the connection between the test chamber 20 and the ozone generator 10; the exhaust valve 25 is set at the air outlet of the test chamber 20, that is, the connection between the test chamber 20 and the exhaust purification device 30. The sampling point is used to collect the gas concentration in the test chamber 20; the temperature and humidity adjustment device is arranged in the test chamber 20, and is used to adjust the temperature and humidity of the test chamber 20 to a predetermined value.

[0094] Preferably, the ozone generating device 10 further includes a humidity regulator for adjusting the humidity of the gas delivered to the test chamber 20 .

[0095] The inner wall of the test chamber body 21 is made of a material that is resistant to ozone oxidation. For example, the inner wall of the test chamber body 21 is made of polyethylene or covered with polytetrafluoroethylene to prevent ozone from oxidizing the chamber body and interfering with the test results, and to prevent ozone from corroding the test chamber.

[0096] The volume of the test chamber can be set as needed. For example, the volume of the test chamber is 3m 3 (Dimensions: 1.4m long x 1.4m wide x 1.5m high) or 30m 3 (Dimensions: length 3.4 × width 3.5 × height 2.5m).

[0097] In some embodiments, a transfer device 23 provided within the test chamber 20 can transfer the air purifier between the test chamber operating window and a designated test position, thereby completing the operation of the air purifier under test, eliminating the need for the tester to enter the chamber and avoid interference caused by the opening and closing of the chamber door. In other embodiments, the air purifier under test has wireless communication capabilities, thereby enabling remote operation.

[0098] In this embodiment, the air inlet valve 24 is located at the upper end of the test chamber 20, and the air exhaust valve 25 is located at the lower end of the test chamber 20, and the opening degree can be automatically controlled by the fan. The ozone generator 10 is capable of stably and continuously generating ozone pollutants with a relatively constant concentration, and is connected to the test chamber to meet the requirements of the dynamic balance method, providing continuous generation of pollutants and dynamic balance tests, simulating the continuous ozone pollution and room conditions in actual homes; further, considering that ozone is easy to decompose, the dynamic balance method can more effectively evaluate the deozonation performance of the air purifier, which is different from the attenuation method that only tests CADR and CCM, and is more in line with actual application conditions; and the ozone generator 10 has a flow regulation function, and the concentration generated is 0.1mg / m 3 ~200 mg / m 3 For example, in a simulated actual environment, the room ventilation frequency in a home is not less than 1 time per hour, generally 1-2 times per hour, and the upstream air intake volume is determined according to the volume of the test chamber.

[0099] In another exemplary embodiment of the present disclosure, a device for testing the ozone removal performance of an air purifier is provided. Unlike the above-described embodiments, the ozone generator 10 of the present disclosure further includes an oxygen source. Ozone generator 10 uses clean, pure oxygen provided by the oxygen source as its gas source, eliminating the need for a filter within ozone generator 10.

[0100] In another exemplary embodiment of the present disclosure, a method for testing the ozone removal performance of an air purifier is provided. The method for testing the ozone removal performance of an air purifier in this embodiment evaluates the ozone removal performance of the air purifier by testing the ozone clean air purification amount of the air purifier, including the following steps:

[0101] S100: The air purifier to be tested is fixed in the test chamber, and the ozone natural attenuation coefficient test is completed under predetermined conditions;

[0102] S200, continuously injecting ozone at a predetermined concentration into the air inlet of the test chamber, and when the ozone concentration at the air outlet of the test chamber stabilizes, turning on the air purifier to be tested;

[0103] S300, continuously input ozone into the test chamber at a predetermined concentration. When the cumulative amount of ozone gas continuously introduced from the upstream reaches a limit or the concentration at the test chamber exhaust outlet is higher than the limit specified in GB / T 18883, turn off the air purifier and the ozone generator, and calculate the cumulative ozone purification amount and the clean air volume.

[0104] The following is a detailed description of each step of this embodiment.

[0105] In step S100, the air purifier to be tested is first fixed in a test chamber, and an ozone natural attenuation coefficient test is completed under predetermined conditions. Specifically, step S100 includes steps S101-S104.

[0106] S101, the air purifier prototype is fixed on a test bench in the test chamber, the test bench is connected to the conveying device, and the air purifier is in the off state above the conveying device.

[0107] S102, turn on the temperature and humidity control device of the test chamber, and turn on the fan and filter of the ozone generator to reduce the background pollutant concentration in the test chamber, and wait until the background concentration, temperature and relative humidity in the test chamber reach the specified state.

[0108] S103: Turn on the stirring fan and the circulation fan, open the ozone generator and the air inlet and exhaust valves of the test chamber, and continuously and stably introduce a gaseous atmosphere with a concentration of (0.48±0.04) mg / m 3 ozone, and continuously monitor the ozone concentration and air volume at the air inlet of the test chamber, as well as the ozone concentration at the air outlet. Preferably, the air volume at the air inlet is 15-30m 3 / h, and the positive pressure in the cabin is controlled at around 5Pa.

[0109] S104, continuously monitor the ozone concentration at the exhaust outlet. When the ozone concentration at the exhaust outlet does not vary by more than 5% within 30 minutes, the test chamber is in an upper stable state. Record the ozone concentration within half an hour and take the average value as C0.

[0110] Specifically, the natural attenuation constant ke is calculated as follows:

[0111] The mass transfer process of ozone pollutants in the cabin satisfies the law of mass conservation, see Equation 1.

[0112]

[0113] Where:

[0114] C - the concentration of pollutants in the test chamber, in milligrams per cubic meter (mg / m 3 );

[0115] C in - The ozone concentration continuously released at the air inlet during the test, in milligrams per cubic meter (mg / m 3 );

[0116] Q in ——Air volume at the test chamber inlet, in cubic meters per hour (m 3 / h);

[0117] k0——natural deposition rate of pollutants, in hours per hour (h -1 );

[0118] k——the number of air changes in the test chamber, in hours per hour (h -1 );

[0119] V——test chamber volume, in cubic meters (m 3 );

[0120] Q - the amount of clean air that the purifier removes ozone, in cubic meters per hour (m 3 / h).

[0121] When the test chamber is in the upper stable state, dC / dt in Equation 1 = 0 and CADR = 0, so the natural attenuation constant is:

[0122]

[0123] Where:

[0124] C0——Concentration of pollutants in the test chamber at the upper steady state, mg / m 3 .

[0125] In step S200, after the natural attenuation test is completed, the air inlet of the test chamber continues to flow in a stable concentration of (0.48±0.04) mg / m 3 The step S200 includes steps S201-S204.

[0126] S201, after the natural attenuation coefficient is completed, ozone is still continuously and stably introduced into the air inlet (upstream) of the test chamber, while the ozone concentration at the air outlet (downstream) of the test chamber is continuously monitored, and the test sample is turned on to the rated state. The time of turning on is recorded as t=0h.

[0127] For example, in step S201, the stirring fan and the circulating fan are turned on to continuously and stably introduce a concentration of (0.48±0.04) mg / m into the air inlet (upstream) of the test chamber. 3 ozone, and continuously monitor the ozone concentration at the exhaust port (downstream) of the test chamber. The upstream air volume is 15-30m 3 / h, for example, the test chamber is 30m 3 When using 30m 3 / h air supply volume; the test chamber is 3m 3 When using 15m 3 / h air supply volume, the positive pressure in the cabin should be controlled at around 5Pa.

[0128] S202: Continuously monitor the ozone concentration at the exhaust port of the test chamber. When it is in a lower stable state for the first time, that is, the first relative ozone concentration stable point is reached, the ozone CADR test is completed.

[0129] For example, the stirring fan and the circulating fan are kept on, and the air inlet of the test chamber is still stably and continuously fed with a concentration of (0.48±0.04) mg / m 3 ozone, and continuously monitor the ozone concentration at the exhaust outlet of the test chamber. Record data every 2 minutes, including the air volume at the air inlet, the pollutant concentration at the air inlet, and the pollutant concentration at the exhaust outlet. When the ozone concentration at the exhaust outlet drops to a range of no more than 5% within 30 minutes, the test chamber is in the lower stable state for the first time. Record the ozone concentration within half an hour, and take the average value as the concentration Ct in the lower stable state.

[0130] S203: Ozone pollutants are continuously introduced upstream and the concentration downstream is continuously monitored. When it stabilizes, the second relatively stable point of ozone concentration is reached.

[0131] For example, the stirring fan and the circulating fan are kept on, and the air inlet (upstream) of the test chamber is still stably and continuously fed with a concentration of (0.48±0.04) mg / m 3 ozone, and continuously monitor the ozone concentration at the exhaust port (downstream) of the test chamber to keep the test going. The trend line of the downstream ozone concentration change is shown in the figure. Figure 2 .

[0132] S204: When the cumulative amount of ozone gas continuously introduced into the air inlet reaches the cumulative purification amount limit corresponding to the CADR set for the target pollutant, or the lower steady-state concentration exceeds the limit specified in GB / T 18883, whichever comes first, the test is terminated, the air purifier and ozone generator to be tested are turned off, the temperature and relative humidity in the test chamber are recorded, and the cumulative ozone purification amount and the ozone clean air volume are calculated.

[0133] The ozone clean air volume is calculated as shown in formula 3.

[0134] When the test chamber is in the upper stable state, dC / dt in Formula 1 = 0, so the clean air volume of the test sample to remove ozone is obtained as Formula 3:

[0135]

[0136] Where:

[0137] C t ——Concentration of pollutants in the test chamber at the lower stable state, mg / m 3 .

[0138] The cumulative ozone purification amount is calculated as follows:

[0139] The cumulative ozone purification amount is calculated according to Formula 4.

[0140]

[0141] Where:

[0142] C in The ozone concentration continuously released at the air inlet during the test is expressed in milligrams per cubic meter (mg / m 3 );

[0143] C out，n During the test, the real-time ozone concentration at the exhaust outlet at time n, in milligrams per cubic meter (mg / m 3 );

[0144] q - air exchange rate in the cabin per hour, in cubic meters per hour (m 3 / h);

[0145] t——time of test end, hours;

[0146] Δt is the time step (interval) that the ozone instrument records each ozone concentration, in hours;

[0147] k e ——Total decay constant, in hours per hour (h -1 );

[0148] V——test chamber volume, in cubic meters (m 3 ).

[0149] In this embodiment, according to the actual home environment, the room ventilation frequency should be no less than 1 hour. -1 , the air inlet (upstream) of different test chamber volumes is set differently, for example, 30m 3 The air volume at the test chamber inlet (upstream) is set to 30m 3 / h,3m3 The air volume at the test chamber inlet (upstream) is set to 15m 3 / h; the target pollutants shall be stably generated at the air inlet (upstream) of the test chamber, and the concentration shall be (3±0.25) times the concentration limit specified in Table 1 of GB / T 18883. The test time shall be based on the ozone cumulative purification limit or the downstream concentration exceeding the limit specified in GB / T 18883, whichever is reached first.

[0150] For the purpose of brief description, any description of technical features in the above-mentioned embodiment 1 that can be used for the same application is combined here, and there is no need to repeat the same description.

[0151] The embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that any implementations not depicted or described in the drawings or the main text of the specification are known to those skilled in the art and are not described in detail. Furthermore, the above definitions of the various elements and methods are not limited to the various specific structures, shapes, or methods described in the embodiments, and can be easily modified or replaced by those skilled in the art.

[0152] It should also be noted that directional terms such as "upper," "lower," "front," "back," "left," and "right" mentioned in the embodiments are merely references to the directions in the accompanying drawings and are not intended to limit the scope of protection of this disclosure. Throughout the drawings, identical elements are represented by identical or similar reference numerals. Conventional structures or configurations will be omitted where they may cause confusion in understanding this disclosure.

[0153] Furthermore, the shapes and sizes of the components in the figures do not reflect the actual sizes and proportions, but are merely illustrative of the contents of the embodiments of the present disclosure. In addition, in the claims, any reference signs placed between brackets should not be construed as limiting the claims.

[0154] Unless otherwise indicated, the numerical parameters in this specification and the appended claims are approximate and can vary depending on the desired properties obtained through the teachings of this disclosure. Specifically, all numbers used in the specification and claims to express compositional amounts, reaction conditions, and the like are to be understood as being modified in all instances by the term "about." Generally, such expressions are intended to encompass variations of ±10% in some embodiments, ±5% in some embodiments, ±1% in some embodiments, and ±0.5% in some embodiments, from the specified quantity.

[0155] Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[0156] The use of ordinal numbers such as "first," "second," and "third" in the specification and claims to modify corresponding elements does not in itself mean that the elements have any ordinal number, nor does it represent the order of one element relative to another or the order in the manufacturing method. The use of such ordinal numbers is only used to clearly distinguish one element with a certain name from another element with the same name.

[0157] Furthermore, unless specifically described or required to occur sequentially, the order of the steps is not limited to the order listed above and may be varied or rearranged based on desired design requirements. Furthermore, the above embodiments may be mixed and matched with each other or with other embodiments based on design and reliability considerations. That is, the technical features of different embodiments may be freely combined to form more embodiments.

[0158] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and further may be divided into a plurality of submodules or subunits or subcomponents. All features disclosed in this specification (including the accompanying claims, abstract and drawings) and all processes or units of any method or device so disclosed may be combined in any combination, except that at least some of such features and / or processes or units are mutually exclusive. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose. Furthermore, in a unit claim enumerating a number of devices, several of these devices may be embodied by the same item of hardware.

[0159] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various disclosed aspects, in the above description of exemplary embodiments of the present disclosure, various features of the present disclosure are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed approach should not be interpreted as reflecting an intention that the claimed disclosure requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, the disclosed aspects consist of fewer than all the features of the individual embodiments disclosed above. Accordingly, the claims that follow the detailed description are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate embodiment of the present disclosure.

[0160] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above are only specific embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A method for testing the deozonation performance of an air purifier, applied to a testing device for the deozonation performance of an air purifier, the testing method comprising: The air purifier to be tested is fixed in the test chamber, and the ozone natural attenuation coefficient test is completed under the predetermined conditions; Inputting ozone into the test chamber at a predetermined concentration, and when the ozone concentration at the exhaust port of the test chamber is stable, turning on the air purifier to be tested; Continuously input ozone into the test chamber at a predetermined concentration. When the cumulative amount of ozone gas continuously introduced from the upstream reaches a limit value, or the concentration at the test chamber exhaust port reaches the same as the ozone concentration at the test chamber inlet, turn off the air purifier and the ozone generator, and calculate the cumulative ozone purification amount and the clean air volume; The method of fixing the air purifier to be tested in the test chamber and completing the ozone natural attenuation coefficient test under predetermined conditions includes: The air purifier to be tested is fixed on the conveying device in the test chamber. The sample to be tested is in the off state during the natural attenuation coefficient test; Turn on the temperature and humidity adjustment device of the test chamber, and turn on the fan of the ozone generator to reduce the background pollutant concentration in the test chamber, and wait until the background concentration, temperature and relative humidity in the test chamber reach the specified state; Turn on the stirring fan and the circulation fan, open the ozone generator and the air inlet and exhaust valves of the test chamber, and continuously and stably introduce ozone with a gaseous concentration of (0.48±0.04) mg / m³ into the air inlet of the test chamber. At the same time, continuously monitor the ozone concentration and air volume at the air inlet of the test chamber, as well as the ozone concentration at the exhaust port; Continuously monitor the ozone concentration at the exhaust port. When the ozone concentration at the exhaust port changes within a predetermined period of time and the range is less than or equal to 5%, the test chamber is in an upper stable state. Record the ozone concentration within half an hour and take the average value as C0. Calculate the natural attenuation coefficient Ke, including: The mass transfer process of ozone pollutants in the cabin satisfies the law of mass conservation: …… ... Where: C——Concentration of pollutants in the test chamber, in milligrams per cubic meter; The ozone concentration continuously and constantly released at the air inlet during the test is expressed in milligrams per cubic meter; Q in ——Air volume at the test chamber inlet, in cubic meters per hour; k0——natural deposition rate of pollutants, in hours; k——the number of ventilation times in the test chamber, in hours; V——test chamber volume, in cubic meters; Q – the amount of clean air that the purifier removes ozone, in cubic meters per hour; When the test chamber is in the upper stable state, And CADR=0, so the natural attenuation constant is: …… ... Where: C0——the concentration of pollutants in the test chamber at the upper steady state, in milligrams per cubic meter; Perform total attenuation testing including: The step of inputting ozone into the test chamber at a predetermined concentration and starting the air purifier to be tested after the ozone concentration at the exhaust port of the test chamber is stabilized comprises: After the natural attenuation coefficient is completed, the sample to be tested is turned on to the rated state, and the time of turning on is recorded as t=0h; Keep the stirring fan and the circulation fan turned on, and the air inlet of the test chamber is still stably and continuously fed with ozone at a concentration of 0.48±0.04mg / m³. At the same time, the ozone concentration at the exhaust port of the test chamber is continuously monitored, and the data is recorded once every predetermined time, including the air volume at the air inlet, the pollutant concentration at the air inlet, and the pollutant concentration at the exhaust port. When the ozone concentration at the exhaust port drops to a range of less than or equal to 5% within the predetermined time, the test chamber is in the lower stable state for the first time, and the ozone concentration within half an hour is recorded, and the average value is taken as the concentration Ct of the lower stable state; Calculate the ozone clean air volume of the sample to be tested, including: When the test chamber is in the upper stable state, , thus obtaining the clean air volume of the tested sample that removes ozone: ……………………(Formula 3) Where: C t ——The pollutant concentration in the test chamber at the lower stable state, in milligrams per cubic meter; Conduct cumulative purification tests, including: When the cumulative amount of ozone gas continuously introduced into the air inlet reaches the cumulative purification amount limit corresponding to the clean air volume setting of the machine for the target pollutant, or the lower steady state concentration is higher than the predetermined limit, the test ends when the first of the two arrives; Calculate the cumulative ozone purification amount: ………………(Formula 4) Where: C out，n ——During the test, the real-time ozone concentration at the exhaust outlet at time n, starting from t=0 h after the test sample is put into operation, in milligrams per cubic meter; q——air change volume in the cabin per hour, in cubic meters per hour; t——time when the test ends, in hours; Δt is the time step of each ozone concentration recorded by the ozone instrument, in hours; k e ——total decay constant, in hours; Among them, the test device for the de-ozone performance of the air purifier includes: A test chamber (20) is used to accommodate the air purifier to be tested and simulate an actual indoor use environment; an ozone generating device (10), the ozone generating device (10) being connected to an air inlet of the test chamber (20) and being used for continuously delivering ozone into the test chamber (20); and An exhaust purification device (30), wherein the exhaust purification device (30) is in communication with an exhaust port of the test chamber (20), and the exhaust purification device (30) is in communication with the outdoors.

2. The testing method according to claim 1, characterized in that: The ozone generating device (10) comprises a fan (13), a pollutant delivery port (14), an air volume measuring device (15) and an upstream sampling port (16) which are connected in sequence, wherein: The fan (13) is used to provide air supply power, transport ozone into the test chamber (20), and adjust the transport flow rate; The pollutant injection port (14) is arranged at the connection between the fan (13) and the test chamber (20) and is used to inject ozone; The air volume measuring device (15) is arranged downstream of the fan (13) and is used to measure the air volume provided by the fan (13); The upstream sampling port (16) is used to measure the ozone concentration at the air inlet of the test chamber (20).

3. The testing method according to claim 2, characterized in that: The test device for air purifier deozone performance also includes: A filter, the filter comprising a particle purification device and a gaseous pollutant removal device, used to purify the background concentration of the test chamber (20); or A pure gas source is used to be connected to the gas source port of the ozone generating device (10) to provide a gas source.

4. The testing method according to claim 2, characterized in that: The ozone generating device (10) further comprises a humidity regulator, which is used to regulate the humidity of the gas delivered to the test chamber (20).

5. The testing method according to claim 1, characterized in that: The test chamber (20) comprises a test chamber body (21), an air flow control device (22), a transmission device (23), an air inlet valve (24), an air exhaust valve (25), a sampling point and a temperature and humidity adjustment device, wherein: The test chamber body (21) is used to accommodate the air purifier to be tested, forming a closed test environment; The airflow control device (22) is used to control the uniform mixing of ozone and airflow; The conveying device (23) is capable of realizing mutual conveyance of the air purifier between the operating window of the test chamber and the designated test position, and comprises a liftable movable platform for placing the air purifier to be tested, and is used for adjusting the position of the air purifier to be tested; The air inlet valve (24) is arranged at the air inlet of the test chamber (20) and is used to open and close the connection between the test chamber (20) and the ozone generating device (10); The exhaust valve (25) is arranged at the air outlet of the test chamber (20) and is used to open and close the connection between the test chamber (20) and the exhaust purification device (30); The sampling point is arranged in the test chamber (20) and is used to collect the gas concentration in the test chamber (20); The temperature and humidity adjustment device is arranged in the test chamber (20) and is used to adjust the temperature and humidity of the test chamber (20) to predetermined values.

6. The testing method according to claim 5, characterized in that: The airflow control device (22) comprises: a stirring fan (221), the stirring fan (221) being arranged at the air inlet of the test chamber (20) and being used for uniformly mixing the gas output by the ozone generating device (10); and A circulation fan (222), wherein the circulation fan (222) is used to ensure that the airflow in the test chamber (20) is fully mixed during the test process.

7. The testing method according to claim 5, characterized in that: The inner wall of the test chamber body (21) is made of a material that is resistant to ozone oxidation corrosion.

8. The testing method according to claim 1, characterized in that: The exhaust air purification device (30) comprises a downstream sampling port for measuring the ozone concentration at the air outlet of the test chamber (20).

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