CN113720964A - Formaldehyde detection system and air purification device applying same - Google Patents
Formaldehyde detection system and air purification device applying same Download PDFInfo
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- CN113720964A CN113720964A CN202010452605.XA CN202010452605A CN113720964A CN 113720964 A CN113720964 A CN 113720964A CN 202010452605 A CN202010452605 A CN 202010452605A CN 113720964 A CN113720964 A CN 113720964A
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 444
- 238000001514 detection method Methods 0.000 title claims abstract description 110
- 238000004887 air purification Methods 0.000 title claims abstract description 67
- 239000003570 air Substances 0.000 claims description 223
- 238000000746 purification Methods 0.000 claims description 16
- 230000007613 environmental effect Effects 0.000 claims description 11
- 239000012080 ambient air Substances 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007664 blowing Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
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- G01N33/0022—General constructional details of gas analysers, e.g. portable test equipment using a number of analysing channels
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Abstract
The invention relates to a formaldehyde detection system and an air purification device, wherein the formaldehyde detection system comprises a formaldehyde sensor and is characterized in that: the device comprises a detection space, an active gas collection and detection device and a controller, wherein the active gas collection and detection device comprises a first channel and a first control gas valve arranged in the first channel, a second channel and a second control gas valve arranged in the second channel, and a third channel and a third control gas valve arranged in the third channel; the first control air valve, the second control air valve and the third control air valve are all connected with the controller and are controlled to be opened and closed by the controller. Compared with the prior art, the invention has the advantages that: the controller controls the third control air valve to be closed under the condition that the formaldehyde detection system is not required to detect the formaldehyde content, so that the third channel is in a normally closed state, the formaldehyde sensor can be prevented from being in a detection environment for a long time, and the formaldehyde sensor is prevented from being poisoned.
Description
Technical Field
The invention relates to a formaldehyde detection system and an air purification device using the same.
Background
Along with the concern of people on health, especially formaldehyde gas with great harmfulness is the main cause of numerous diseases, so some air purification devices increase the detection function of formaldehyde content on the basis of air purification, can indicate the air quality in the current environment better. The formaldehyde sensor for general household use is susceptible to various influences, one of which is the influence of air flow, so that the formaldehyde sensor is usually prevented from being designed at the air inlet and the air outlet of the air purification device, but the mode can only avoid the interference of the air flow of the air purification device, but cannot avoid the interference of other external air flows, such as wind blowing, a fan and the like. Secondly, the formaldehyde sensor may be poisoned in the environment of high concentration formaldehyde (or interference gas) for a long time, so that the formaldehyde sensor is damaged.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a formaldehyde detection system capable of preventing a formaldehyde sensor from being affected by air flow and preventing the formaldehyde sensor from being poisoned, aiming at the above prior art.
A second technical problem to be solved by the present invention is to provide an air purification device with formaldehyde detection function, which can prevent the formaldehyde sensor from being affected by air flow and can prevent the formaldehyde sensor from being poisoned.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a formaldehyde detecting system, includes formaldehyde sensor, its characterized in that: the device also comprises a detection space, an active gas collection and detection device and a controller, wherein the active gas collection and detection device comprises
The inlet of the first channel is communicated with the outside, the outlet of the first channel is communicated with the detection space, a first control air valve is arranged in the first channel,
the outlet of the second channel is communicated with the outside, the inlet of the second channel is communicated with the detection space, a second control air valve is arranged in the second channel,
the inlet of the third channel is communicated with the detection space, the formaldehyde sensor is arranged at the outlet of the third channel, and a third control air valve is arranged in the third channel;
the first control air valve, the second control air valve and the third control air valve are all connected with the controller, and the controller controls the opening and closing of the first control air valve, the second control air valve and the third control air valve, so that the conduction and the closing of the three channels are realized; when the three channels are closed, the detection space forms a closed space, and when only the first channel is conducted, the detection space is communicated with the external part through the first channel; when only the second channel is conducted, the detection space is communicated with the external connector through the second channel, and when only the third channel is conducted, the detection space is communicated with the external connector through the third channel; under the condition that the formaldehyde detection system is not required to detect the formaldehyde content, the controller controls the third control air valve to be closed, so that the third channel is in a normally closed state; when the formaldehyde detection system is required to detect the formaldehyde content, the controller firstly controls the first control air valve and the second control air valve to be opened, so that the first channel and the second channel are simultaneously communicated, external gas enters the detection space, after the air flow in the space to be detected is stable, the controller firstly controls the first control air valve and the second control air valve to be closed, so that the first channel and the second channel are simultaneously closed, then controls the third control air valve to be opened, so that the third channel is communicated, and the formaldehyde sensor measures the formaldehyde content in the gas in the detection space.
As an improvement, the active gas collecting and detecting device further comprises a fourth channel, an inlet of the fourth channel is communicated with the detection space, an outlet of the fourth channel is communicated with the outside, and a fourth control gas valve is arranged in the fourth channel; the fourth control air valve is also connected with the controller, and the controller controls the fourth control air valve to open and close, so that the fourth channel is communicated and closed.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides an air purification device, includes air purification controller, air purification module, inlet channel and exhaust passage, inlet channel's entry and external environment intercommunication, and air purification module is connected with the air purification controller and is controlled its operating condition by the air purification controller, and inlet channel's export and air purification module's entry intercommunication, exhaust passage's entry and air purification module's export intercommunication, exhaust passage's export and external environment intercommunication, its characterized in that: the formaldehyde detection system with the structure is further included, wherein the inlet of the second channel is communicated with the air inlet channel.
As an improvement, the active gas collecting and detecting device further comprises a fourth channel, an inlet of the fourth channel is communicated with the detection space, an outlet of the fourth channel is communicated with the exhaust channel, and a fourth control gas valve is arranged in the fourth channel; the fourth control air valve is also connected with the controller, and the controller controls the fourth control air valve to open and close, so that the fourth channel is communicated and closed.
The controller is integrated with the air purification controller, or the controller directly adopts the air purification controller.
The formaldehyde detection system detects the formaldehyde content in the air before purification through the following steps:
step 1, a controller controls a first control air valve and a second control air valve to be opened to enable a first channel and a second channel to be communicated, controls a third control air valve to be closed to enable a third channel to be closed, and enables air in an external environment to enter a detection space through the first channel by utilizing suction of an air inlet channel and then flow out of the second channel;
and 3, after the gas in the space to be detected is stable, opening a third control gas valve of the controller to enable a third channel to be conducted, and enabling a formaldehyde sensor to measure the content of formaldehyde in the gas in the space to be detected.
The formaldehyde detection system detects the formaldehyde content in the air before purification through the following steps:
step 1, a controller controls a first control air valve and a second control air valve to be opened to enable a first channel and a second channel to be communicated, controls a third control air valve and a fourth control air valve to be closed to enable a third channel and a fourth channel to be closed, and enables air in an external environment to enter a detection space through the first channel and then flow out of the second channel by utilizing suction of an air inlet channel;
and 3, after the gas in the space to be detected is stable, opening a third control gas valve of the controller to enable a third channel to be conducted, and enabling a formaldehyde sensor to measure the content of formaldehyde in the gas in the space to be detected.
The formaldehyde detection system detects the formaldehyde content in the air purified by the air purification device through the following steps:
step S1, the controller controls the second control air valve and the fourth control air valve to be opened, controls the first air valve and the third control air valve to be closed at the same time, and makes the purified air enter the detection space through the fourth channel by utilizing the suction force of the air inlet channel in the air purification device and then flows out from the second channel;
step S2, after the preset time, the controller controls the second control air valve and the fourth control air valve to be closed, and simultaneously keeps the first control air valve and the third control air valve to be closed, so as to finish the collection of the environmental gas;
and step S3, after the gas in the space to be detected is stable, the third control gas valve of the controller is opened, so that the third channel is conducted, and the formaldehyde sensor is used for measuring the formaldehyde content in the gas in the detection space.
The formaldehyde detection system detects the formaldehyde content in the mixed air obtained by mixing the ambient air and the air purified by the air purification device through the following steps:
step A1, the controller controls the first control air valve, the second control air valve and the fourth control air valve to be opened simultaneously and controls the third control air valve to be closed simultaneously, the suction force of the air inlet channel of the air purification device is utilized to enable the air in the environment and the purified air to reach the detection space to be mixed after passing through the first channel and the fourth channel respectively, and then the air flows out through the second channel;
step A2, after a preset time, the controller controls the first control air valve, the second control air valve and the fourth control air valve to be closed, meanwhile, the third control air valve is kept closed, and the collection of the environmental gas is completed;
and step A3, after the gas in the space to be detected is stable, opening a third control gas valve of the controller to enable the third channel to be conducted, and enabling the formaldehyde sensor to measure the formaldehyde content in the gas in the space to be detected.
The formaldehyde detection system can further protect the formaldehyde sensor through the following strategies:
strategy 1, in the case of the operation of the formaldehyde detection system, if it is detected that the concentration of formaldehyde in the environment is lower than a first preset threshold, the above steps 1 to 3 or steps S1 to S3 or steps a1 to A3 are normally performed;
and the strategy 2 is that under the condition that the formaldehyde detection system works, if the formaldehyde content in the air before purification is detected to be higher than a second preset threshold value, the formaldehyde content in the air before purification is calculated by detecting the formaldehyde content in the purified air and detecting the formaldehyde content in mixed air formed by mixing the ambient air and the air purified by the air purification device.
And 3, under the condition that the formaldehyde detection system works, if the formaldehyde content in the air before purification is detected to be higher than a second preset threshold value, and meanwhile, the formaldehyde content in the mixed air obtained by mixing the ambient air and the air purified by the air purification device is also higher than the second preset threshold value, reducing the execution frequency of the strategy 2.
Compared with the prior art, the invention has the advantages that: the controller controls the third control air valve to be closed under the condition that the formaldehyde detection system is not required to detect the formaldehyde content, so that the third channel is in a normally closed state, the formaldehyde sensor can be prevented from being in a detection environment for a long time, and the formaldehyde sensor is prevented from being poisoned.
Drawings
FIG. 1 is a block diagram of a formaldehyde detection system according to a first embodiment of the present invention.
FIG. 2 is a block diagram of a formaldehyde detection system according to a second embodiment of the present invention.
FIG. 3 is a block diagram of an air purification apparatus using the formaldehyde detection system of the second embodiment.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings.
Example one
The formaldehyde detecting system shown in fig. 1 comprises a formaldehyde sensor 1, a detecting space 2, an active gas collecting and detecting device and a controller 3, wherein the active gas collecting and detecting device comprises
A first channel 41, the inlet of which is communicated with the outside, the outlet of which is communicated with the detection space, a first control air valve 42 is arranged in the first channel,
a second channel 43, the outlet of which is communicated with the outside, the inlet of which is communicated with the detection space, a second control air valve 44 is arranged in the second channel,
the inlet of the third channel is communicated with the detection space, the formaldehyde sensor is arranged at the outlet of the third channel, and a third control air valve 46 is arranged in the third channel;
the first control air valve 42, the second control air valve 44 and the third control air valve 45 are all connected with the controller 3, and the controller controls the opening and closing of the first control air valve, the second control air valve and the third control air valve, so that the conduction and the closing of the three channels are realized; when the three channels are closed, the detection space forms a closed space, and when only the first channel is conducted, the detection space is communicated with the external part through the first channel; when only the second channel is conducted, the detection space is communicated with the external connector through the second channel, and when only the third channel is conducted, the detection space is communicated with the external connector through the third channel; under the condition that the formaldehyde detection system is not required to detect the formaldehyde content, the controller controls the third control air valve to be closed, so that the third channel is in a normally closed state; when the formaldehyde detection system is required to detect the formaldehyde content, the controller firstly controls the first control air valve and the second control air valve to be opened, so that the first channel and the second channel are simultaneously communicated, external gas enters the detection space, after the air flow in the space to be detected is stable, the controller firstly controls the first control air valve and the second control air valve to be closed, so that the first channel and the second channel are simultaneously closed, then controls the third control air valve to be opened, so that the third channel is communicated, and the formaldehyde sensor measures the formaldehyde content in the gas in the detection space.
Example two
The difference from the first embodiment is that the active gas collection and detection device further comprises a fourth channel 47, an inlet of the fourth channel is communicated with the detection space, an outlet of the fourth channel is communicated with the outside, and a fourth control gas valve 48 is arranged in the fourth channel; the fourth control air valve 48 is also connected to the controller 3 and is controlled by the controller to open and close, so as to realize the passage and closing of the fourth channel, as shown in fig. 2.
The air purification device with the formaldehyde detection system in the embodiment comprises an air purification controller, an air purification module 5, an air inlet channel 6 and an exhaust channel 7, wherein the inlet of the air inlet channel is communicated with the external environment, the air purification module 5 is connected with the air purification controller and the working state of the air purification controller is controlled by the air purification controller, the outlet of the air inlet channel 6 is communicated with the inlet of the air purification module 5, the inlet of the exhaust channel 7 is communicated with the outlet of the air purification module 5, the outlet of the exhaust channel 7 is communicated with the external environment, and the inlet of a second channel in the formaldehyde detection system is communicated with the air inlet channel; the outlet of the fourth passage communicates with the exhaust passage, see fig. 3.
In this embodiment, the controller 3 directly adopts an air purification controller.
The formaldehyde detection system in the air purification device detects the formaldehyde content in the air before purification through the following steps:
step 1, a controller controls a first control air valve and a second control air valve to be opened to enable a first channel and a second channel to be communicated, controls a third control air valve and a fourth control air valve to be closed to enable a third channel and a fourth channel to be closed, and enables air in an external environment to enter a detection space through the first channel and then flow out of the second channel by utilizing suction of an air inlet channel;
and 3, after the gas in the space to be detected is stable, opening a third control gas valve of the controller to enable a third channel to be conducted, and enabling a formaldehyde sensor to measure the content of formaldehyde in the gas in the space to be detected.
The method separates the gas collection process from the formaldehyde detection process by utilizing four channels and a detection space, and avoids the influence of gas flow by detecting stable gas in the space. Meanwhile, under the condition that the formaldehyde detection system is not required to detect the content of formaldehyde, the controller controls the third control air valve to be closed, so that the third channel is in a normally closed state, and the third channel is opened only when the detection is required, so that the formaldehyde sensor is prevented from being in a detection environment for a long time, and the formaldehyde sensor is prevented from being poisoned.
The formaldehyde detection system detects the formaldehyde content in the air purified by the air purification device through the following steps:
step S1, the controller controls the second control air valve and the fourth control air valve to be opened, controls the first air valve and the third control air valve to be closed at the same time, and makes the purified air enter the detection space through the fourth channel by utilizing the suction force of the air inlet channel in the air purification device and then flows out from the second channel;
step S2, after the preset time, the controller controls the second control air valve and the fourth control air valve to be closed, and simultaneously keeps the first control air valve and the third control air valve to be closed, so as to finish the collection of the environmental gas;
and step S3, after the gas in the space to be detected is stable, the third control gas valve of the controller is opened, so that the third channel is conducted, and the formaldehyde sensor is used for measuring the formaldehyde content in the gas in the detection space.
The formaldehyde content in the air purified by the air purification device is detected, the formaldehyde content can be used for evaluating the purification effect, and the service life of the purification component is calculated.
The formaldehyde detection system detects the formaldehyde content in the mixed air obtained by mixing the ambient air and the air purified by the air purification device through the following steps:
step A1, the controller controls the first control air valve, the second control air valve and the fourth control air valve to be opened simultaneously and controls the third control air valve to be closed simultaneously, the suction force of the air inlet channel of the air purification device is utilized to enable the air in the environment and the purified air to reach the detection space to be mixed after passing through the first channel and the fourth channel respectively, and then the air flows out through the second channel;
step A2, after a preset time, the controller controls the first control air valve, the second control air valve and the fourth control air valve to be closed, meanwhile, the third control air valve is kept closed, and the collection of the environmental gas is completed;
and step A3, after the gas in the space to be detected is stable, opening a third control gas valve of the controller to enable the third channel to be conducted, and enabling the formaldehyde sensor to measure the formaldehyde content in the gas in the space to be detected.
The formaldehyde detection system can further protect the formaldehyde sensor by the following strategies:
strategy 1, in the case of the operation of the formaldehyde detection system, if it is detected that the concentration of formaldehyde in the environment is lower than a first preset threshold, the above steps 1 to 3 or steps S1 to S3 or steps a1 to A3 are normally performed;
and the strategy 2 is that under the condition that the formaldehyde detection system works, if the formaldehyde content in the air before purification is detected to be higher than a second preset threshold value, the formaldehyde content in the air before purification is calculated by detecting the formaldehyde content in the purified air and detecting the formaldehyde content in mixed air formed by mixing the ambient air and the air purified by the air purification device.
And 3, under the condition that the formaldehyde detection system works, if the formaldehyde content in the air before purification is detected to be higher than a second preset threshold value, and meanwhile, the formaldehyde content in the mixed air obtained by mixing the ambient air and the air purified by the air purification device is also higher than the second preset threshold value, reducing the execution frequency of the strategy 2.
Claims (10)
1. The utility model provides a formaldehyde detecting system, includes formaldehyde sensor, its characterized in that: the device also comprises a detection space, an active gas collection and detection device and a controller, wherein the active gas collection and detection device comprises
The inlet of the first channel is communicated with the outside, the outlet of the first channel is communicated with the detection space, a first control air valve is arranged in the first channel,
the outlet of the second channel is communicated with the outside, the inlet of the second channel is communicated with the detection space, a second control air valve is arranged in the second channel,
the inlet of the third channel is communicated with the detection space, the formaldehyde sensor is arranged at the outlet of the third channel, and a third control air valve is arranged in the third channel;
the first control air valve, the second control air valve and the third control air valve are all connected with the controller, and the controller controls the opening and closing of the first control air valve, the second control air valve and the third control air valve, so that the conduction and the closing of the three channels are realized; when the three channels are closed, the detection space forms a closed space, and when only the first channel is conducted, the detection space is communicated with the external part through the first channel; when only the second channel is conducted, the detection space is communicated with the external connector through the second channel, and when only the third channel is conducted, the detection space is communicated with the external connector through the third channel; under the condition that the formaldehyde detection system is not required to detect the formaldehyde content, the controller controls the third control air valve to be closed, so that the third channel is in a normally closed state; when the formaldehyde detection system is required to detect the formaldehyde content, the controller firstly controls the first control air valve and the second control air valve to be opened, so that the first channel and the second channel are simultaneously communicated, external gas enters the detection space, after the air flow in the space to be detected is stable, the controller firstly controls the first control air valve and the second control air valve to be closed, so that the first channel and the second channel are simultaneously closed, then controls the third control air valve to be opened, so that the third channel is communicated, and the formaldehyde sensor measures the formaldehyde content in the gas in the detection space.
2. The formaldehyde detection system according to claim 1, wherein: the active gas collecting and detecting device also comprises a fourth channel, the inlet of the fourth channel is communicated with the detection space, the outlet of the fourth channel is communicated with the outside, and a fourth control gas valve is arranged in the fourth channel; the fourth control air valve is also connected with the controller, and the controller controls the fourth control air valve to open and close, so that the fourth channel is communicated and closed.
3. The utility model provides an air purification device, includes air purification controller, air purification module, inlet channel and exhaust passage, inlet channel's entry and external environment intercommunication, and air purification module is connected with the air purification controller and is controlled its operating condition by the air purification controller, and inlet channel's export and air purification module's entry intercommunication, exhaust passage's entry and air purification module's export intercommunication, exhaust passage's export and external environment intercommunication, its characterized in that: further comprising the formaldehyde detection system of claim 1, wherein an inlet of the second passage communicates with the intake passage.
4. The air purification apparatus according to claim 3, wherein: the active gas collecting and detecting device also comprises a fourth channel, the inlet of the fourth channel is communicated with the detection space, the outlet of the fourth channel is communicated with the exhaust channel, and a fourth control gas valve is arranged in the fourth channel; the fourth control air valve is also connected with the controller, and the controller controls the fourth control air valve to open and close, so that the fourth channel is communicated and closed.
5. The air purification apparatus according to claim 4, wherein: the controller is integrated with the air purification controller, or the controller directly adopts the air purification controller.
6. The air purification apparatus according to claim 3, wherein: the formaldehyde detection system detects the formaldehyde content in the air before purification through the following steps:
step 1, a controller controls a first control air valve and a second control air valve to be opened to enable a first channel and a second channel to be communicated, controls a third control air valve to be closed to enable a third channel to be closed, and enables air in an external environment to enter a detection space through the first channel by utilizing suction of an air inlet channel and then flow out of the second channel;
step 2, after the preset time, the controller controls the first control air valve and the second control air valve to be closed, and simultaneously keeps the third control air valve to be closed, so that the environmental gas collection is completed;
and 3, after the gas in the space to be detected is stable, opening a third control gas valve of the controller to enable a third channel to be conducted, and enabling a formaldehyde sensor to measure the content of formaldehyde in the gas in the space to be detected.
7. The air purification apparatus according to claim 4, wherein: the formaldehyde detection system detects the formaldehyde content in the air before purification through the following steps:
step 1, a controller controls a first control air valve and a second control air valve to be opened to enable a first channel and a second channel to be communicated, controls a third control air valve and a fourth control air valve to be closed to enable a third channel and a fourth channel to be closed, and enables air in an external environment to enter a detection space through the first channel and then flow out of the second channel by utilizing suction of an air inlet channel;
step 2, after the preset time, the controller controls the first control air valve and the second control air valve to be closed, and meanwhile, the third control air valve and the fourth control air valve are kept closed, so that the environmental gas collection is completed;
and 3, after the gas in the space to be detected is stable, opening a third control gas valve of the controller to enable a third channel to be conducted, and enabling a formaldehyde sensor to measure the content of formaldehyde in the gas in the space to be detected.
8. The air purification apparatus according to claim 7, wherein: the formaldehyde detection system detects the formaldehyde content in the air purified by the air purification device through the following steps:
step S1, the controller controls the second control air valve and the fourth control air valve to be opened, controls the first air valve and the third control air valve to be closed at the same time, and makes the purified air enter the detection space through the fourth channel by utilizing the suction force of the air inlet channel in the air purification device and then flows out from the second channel;
step S2, after the preset time, the controller controls the second control air valve and the fourth control air valve to be closed, and simultaneously keeps the first control air valve and the third control air valve to be closed, so as to finish the collection of the environmental gas;
and step S3, after the gas in the space to be detected is stable, the third control gas valve of the controller is opened, so that the third channel is conducted, and the formaldehyde sensor is used for measuring the formaldehyde content in the gas in the detection space.
9. The air purification apparatus according to claim 8, wherein: the formaldehyde detection system detects the formaldehyde content in the mixed air obtained by mixing the ambient air and the air purified by the air purification device through the following steps:
step A1, the controller controls the first control air valve, the second control air valve and the fourth control air valve to be opened simultaneously and controls the third control air valve to be closed simultaneously, the suction force of the air inlet channel of the air purification device is utilized to enable the air in the environment and the purified air to reach the detection space to be mixed after passing through the first channel and the fourth channel respectively, and then the air flows out through the second channel;
step A2, after a preset time, the controller controls the first control air valve, the second control air valve and the fourth control air valve to be closed, meanwhile, the third control air valve is kept closed, and the collection of the environmental gas is completed;
and step A3, after the gas in the space to be detected is stable, opening a third control gas valve of the controller to enable the third channel to be conducted, and enabling the formaldehyde sensor to measure the formaldehyde content in the gas in the space to be detected.
10. The air purification apparatus according to claim 9, wherein: the formaldehyde detection system can further protect the formaldehyde sensor through the following strategies:
strategy 1, in the case of the operation of the formaldehyde detection system, if it is detected that the concentration of formaldehyde in the environment is lower than a first preset threshold, the above steps 1 to 3 or steps S1 to S3 or steps a1 to A3 are normally performed;
and the strategy 2 is that under the condition that the formaldehyde detection system works, if the formaldehyde content in the air before purification is detected to be higher than a second preset threshold value, the formaldehyde content in the air before purification is calculated by detecting the formaldehyde content in the purified air and detecting the formaldehyde content in mixed air formed by mixing the ambient air and the air purified by the air purification device.
And 3, under the condition that the formaldehyde detection system works, if the formaldehyde content in the air before purification is detected to be higher than a second preset threshold value, and meanwhile, the formaldehyde content in the mixed air obtained by mixing the ambient air and the air purified by the air purification device is also higher than the second preset threshold value, reducing the execution frequency of the strategy 2.
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