CN215180006U

CN215180006U - Air detection device

Info

Publication number: CN215180006U
Application number: CN202120776658.7U
Authority: CN
Inventors: 王堃; 胡镇韬; 毛建平; 王墅; 伍晨迪; 贾林虎
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-12-14
Anticipated expiration: 2031-04-15

Abstract

The present application relates to an air detection device. This empty gas detection surveys device includes: a sampling portion for collecting a first gas, the sampling portion having a channel for receiving the first gas; the decomposition piece is arranged in the channel and used for decomposing formaldehyde in the first gas penetrating through the decomposition piece to obtain a second gas; and a detection part for detecting the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas so as to obtain the formaldehyde concentration in the first gas according to the difference value between the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas. Compared with the prior art, this application obtains the second gas through utilizing the formaldehyde of decomposer in with first gas to decompose, calculates the formaldehyde concentration in the first gas according to the difference of the carbon dioxide concentration of first gas and second gas, and it is with low costs and detect the precision height to detect.

Description

Air detection device

Technical Field

The application relates to the technical field of air quality detection, in particular to an air detection device.

Background

Indoor air pollution has become an important field which people pay more and more attention to, and a convenient, rapid and accurate formaldehyde detection technology becomes a key direction of attention of family users. The existing formaldehyde testing method is mainly based on a formaldehyde sensor of an electrochemical method, and the detection principle is that formaldehyde molecules and internal electrolyte thereof generate electrochemical reaction to generate electrons, the electrons form current, and the content of the formaldehyde molecules is judged by monitoring the current. This type of sensor has problems of high cost and inaccurate detection.

SUMMERY OF THE UTILITY MODEL

This application is to current formaldehyde sensor with high costs and the unsafe problem of monitoring, provides an empty gas detection surveys device, and this empty gas detection surveys device has low cost and detects the high technological effect of precision.

An air detection device comprising:

a sampling portion for collecting a first gas, the sampling portion having a channel for receiving the first gas;

the decomposition piece is arranged in the channel and used for decomposing formaldehyde in the first gas penetrating through the decomposition piece to obtain a second gas; and

a detection section for detecting a carbon dioxide concentration of the first gas and a carbon dioxide concentration of the second gas to obtain a formaldehyde concentration in the first gas from a difference between the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas.

In one embodiment, the decomposition member includes a decomposition film made of or coated with a formaldehyde decomposition material.

In one embodiment, the channels include a first channel and a second channel that are not in communication with each other;

the decomposition piece is arranged in the first channel and used for decomposing the first gas in the first channel to obtain the second gas;

the detection unit is configured to detect a carbon dioxide concentration of the second gas in the first passage and detect a carbon dioxide concentration of the first gas in the second passage.

The size of the decomposing part is equivalent to the drift diameter of the first channel.

In one embodiment, the detection portion includes a first sensor and a second sensor;

the first sensor is arranged in the first channel, is positioned on the downstream of the decomposition component on the airflow path and is used for detecting the carbon dioxide concentration of the second gas in the first channel; the second sensor is arranged in the second channel and used for detecting the concentration of the carbon dioxide of the first gas in the second channel.

In one embodiment, the sampling portion includes a housing forming the channel and a pumping portion disposed in the housing for providing a pumping force for gas to enter the channel.

In one embodiment, the housing further forms an exhaust chamber in communication with the passage, and the exhaust portion is disposed in the exhaust chamber, and when the suction force is provided by the exhaust portion, gas enters the exhaust chamber through the passage.

In one embodiment, the housing has an exhaust hole communicating with the pumping chamber, and when the pumping portion provides the pumping force, gas enters the pumping chamber through the passage and is exhausted from the housing through the exhaust hole.

In one embodiment, the sampling part further comprises a partition part which is arranged in the shell and partitions the shell to form the passage and the air pumping chamber, and the partition part is provided with a mounting cavity which is communicated with the passage and the air pumping chamber;

the detection part is arranged in the mounting cavity.

In one embodiment, the handle is arranged outside the shell.

Above-mentioned air detection device, when actual operation, in the first gas access channel was gathered to the sampling portion, the first gas can be decomposed to the decomposition piece, detects the carbon dioxide concentration that can detect the first gas that is not decomposed to and detect the carbon dioxide concentration of the second gas after the first gas is decomposed. The concentration of carbon dioxide obtained by decomposing formaldehyde in the first gas can be obtained by detecting the difference between the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas by the detection unit, and the concentration of formaldehyde in the first gas can be obtained. Compared with the prior art, the formaldehyde in the first gas is decomposed by the decomposing piece to obtain the second gas, the concentration of the formaldehyde in the first gas is calculated according to the difference value of the concentrations of the carbon dioxide of the first gas and the second gas, the detection cost is low, and the detection precision is high.

Drawings

FIG. 1 is a perspective view of an air detection device according to an embodiment of the present application;

FIG. 2 is a top view of the air detection unit shown in FIG. 1;

fig. 3 is a rear view of the air detection unit shown in fig. 2.

Description of reference numerals:

an air detection device 10; a sampling unit (11); a channel 111; a housing 112; an air extraction section 113; an exhaust chamber 114;

an exhaust vent 115; a partition 116; a decomposition member 12; a detection unit 13; a grip 14.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 2, an embodiment of the present application provides an air detection apparatus 10, which includes a sampling portion 11, a decomposition component 12, and a detection portion 13. The first sampling portion 11 is for collecting a first gas and has a passage 111 for accommodating the first gas. The decomposition member 12 is provided in the passage 111 for decomposing formaldehyde in the first gas that has penetrated itself to obtain the second gas. The detection unit 13 is configured to detect a carbon dioxide concentration of the first gas and a carbon dioxide concentration of the second gas, and obtain a formaldehyde concentration in the first gas according to a difference between the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas.

In the air detection device 10, in actual operation, the sampling unit 11 collects the first gas and enters the passage 111, and the decomposition member 12 can decompose the first gas, detect the carbon dioxide concentration of the first gas that is not decomposed, and detect the carbon dioxide concentration of the second gas that is obtained by decomposing the first gas. The concentration of carbon dioxide obtained by decomposing formaldehyde in the first gas can be obtained by detecting the difference between the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas by the detection unit 13, and the concentration of formaldehyde in the first gas can be obtained.

Compared with the prior art, the formaldehyde in the first gas is decomposed by the decomposing element 12 to obtain the second gas, the concentration of the formaldehyde in the first gas is calculated according to the difference value of the concentrations of the carbon dioxide of the first gas and the second gas, the detection cost is low, and the detection precision is high.

The detection unit 13 may be a sensor having a function of detecting the concentration of carbon dioxide, may be a sensor dedicated to detecting the concentration of carbon dioxide, or may be an integrated sensor (for example, a sensor integrating humidity detection and carbon dioxide detection) in which the detection of the contents of a plurality of components is integrated.

It can be understood that the decomposition member 12 is disposed on the gas flow path in the channel 111 and is connected with the inner wall of the channel 111 in a sealing manner, so that the first gas in the channel 111 can flow out to obtain the second gas after being decomposed by the decomposition member 12 on the gas flow path, so that the first gas can be sufficiently decomposed.

It is understood that the air detection device 10 further includes a processing unit, connected to the detection unit 13, for acquiring the carbon dioxide concentration data detected by the detection unit 13, and obtaining the formaldehyde concentration in the first gas according to the difference between the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas. The processing part is a processing element with a processing function, such as an industrial personal computer, a central processing unit, a microprocessor, an embedded single chip microcomputer and the like. And are not particularly limited herein. The processor may be integrated with the detector or may be provided separately.

Further, the air detection device 10 further includes a display screen, and the display screen is connected to the processing unit and is used for receiving the calculation result of the processing unit and displaying the formaldehyde concentration. The user is facilitated to know the air quality.

It will be appreciated that the first gas is a gas within the environment to be detected. The air detection device 10 provided in the embodiment of the present application can also be used to detect the content of other components (such as carbon dioxide content) of the first gas, and the above is only a description of a part of the structure of formaldehyde detection. For example, when the ambient humidity needs to be detected, the air detection device 10 may further include a humidity sensor 13 for detecting the water content of the first gas, i.e., obtaining the ambient humidity.

In some embodiments, the decomposition member 12 includes a decomposition film made of or coated with a formaldehyde decomposition material. When the first gas passes through the decomposition membrane, the first gas contacts with the formaldehyde material on the decomposition membrane and reacts to generate carbon dioxide and water.

The formaldehyde decomposing material may be a non-photocatalyst material, such as manganese dioxide, chromium pentoxide, chlorine oxide, etc. The non-photocatalyst material can directly decompose formaldehyde without requiring light conditions or ultraviolet conditions when contacted with formaldehyde. In addition, the formaldehyde decomposition material may be a photocatalyst material such as titanium oxide, and in this case, the detection unit 13 further includes an ultraviolet generator (e.g., an ultraviolet UV lamp) for catalyzing the titanium oxide to decompose formaldehyde by ultraviolet rays generated by the ultraviolet generator. In other embodiments, the decomposition member 12 may also be an ozone generator, a negative ion generator, or the like.

It is understood that the first gas can penetrate the decomposition membrane after passing through the decomposition membrane to obtain the second gas. Preferably, the decomposition membrane may be a porous material (e.g., a nano-porous material) made of a formaldehyde decomposition material, or a porous material based on a porous substrate (e.g., a plastic substrate) coated with a formaldehyde decomposition material.

Each of the decomposition films may have one or more formaldehyde decomposition materials, and the specific form is not limited.

Further, the decomposition member 12 includes a plurality of decomposition membranes which are sequentially arranged at intervals on the gas flow path. The first gas flows through the decomposition films in sequence to be decomposed to obtain the second gas, so that the formaldehyde in the first gas can be effectively decomposed, and the accuracy of the measurement result is improved.

In some embodiments, referring to fig. 1 and 2, the channel 111 includes a first channel and a second channel that are not in communication with each other. The decomposition member 12 is disposed in the first passage and is configured to decompose the first gas in the first barrel to obtain a second gas. The detection unit 13 detects the carbon dioxide concentration of the second gas in the first channel and detects the carbon dioxide concentration of the first gas in the second channel.

In actual operation, the first gas is sucked into the first channel and the second channel. The first gas of the first channel passes through the decomposition member 12 when flowing, and is decomposed by the decomposition member 12 to become the second gas, and the second gas passes through the detection portion 13 when flowing, so that the detection portion 13 can detect the concentration of carbon dioxide contained therein. The first gas of the second passage does not pass through the decomposition member 12 but directly passes through the detection portion 13 while flowing, so that the detection portion 13 detects the concentration of carbon dioxide contained therein. The difference between the two concentration values detected by the detecting part 13 is the concentration of carbon dioxide decomposed by the decomposing element 12 in the second gas, so that the concentration of formaldehyde can be obtained.

At this time, by providing the two passages 111 without the two passages 111 being communicated with each other, the detection unit 13 can detect the carbon dioxide concentrations of the first gas and the second gas conveniently, which contributes to simplifying the structure of the entire air detection apparatus 10.

Further, the size of the decomposition member 12 is equivalent to the size of the path of the first passage. At this time, the decomposition member 12 is hermetically connected to the first passage, and the first gas can completely pass through the decomposition member 12, and further, the formaldehyde in the first gas can completely pass through the decomposition member 12. Therefore, the accuracy of the detection result is improved.

Wherein the decomposition member 12 may be provided at an inlet of the first passage. The first gas can directly enter the interior of the decomposition member 12 through the inlet of the first passage and is decomposed by contacting with the formaldehyde decomposition material. Of course, the decomposition member 12 may be provided in the middle of the first passage. And is not particularly limited.

Alternatively, referring to fig. 1 and 2, the decomposition member 12 is provided to cover the inlet of the first passage. At this time, the size of the decomposition element 12 may be equivalent to the size (diameter) of the inlet of the first passage, i.e., complete decomposition of the first gas may be achieved, which contributes to a reduction in the size of the decomposition element 12, an increase in the utilization rate of the decomposition element 12, and a reduction in the cost of the decomposition material.

When the channel 111 includes the first channel and the second channel, the detection unit 13 may include two sensors or only one sensor. For example, when the detection portion 13 includes only one sensor, the second gas obtained by decomposition in the first channel and the first gas not decomposed in the second channel can sequentially enter the sensor and be sequentially detected by the sensor. Specifically, the air detection device 10 may further include a first installation portion, the first installation portion has a first accommodation cavity therein, the sensor is located in the first accommodation cavity, the first installation portion has a first inlet and a second inlet communicated with the first accommodation cavity, the first inlet is connected to an outlet of the first channel, the second inlet is connected to an outlet of the second channel, an outlet of the first channel is provided with a first valve, an outlet of the second channel is provided with a second valve, when the sensor is used for detecting the second gas of the first channel, the first valve switches on the first channel and the first accommodation cavity, and the second valve stops the second channel and the first accommodation cavity, the second gas in the first channel enters the first accommodation cavity and enters the sensor, and a detection result of the sensor at this time is a carbon dioxide concentration of the second gas. When the sensor is used for detecting the first gas of the second channel, the first valve stops the first channel and the first accommodating cavity, the second valve conducts the second channel and the first accommodating cavity, the first gas in the second channel enters the first accommodating cavity and enters the sensor, and the detection result of the sensor is the carbon dioxide concentration of the first gas. The concentration of formaldehyde in the first gas can thus be obtained from the concentration difference of two successive results.

In other embodiments, the number of the channels 111 may be only one, and the detection may include only one sensor or two sensors. Illustratively, the number of the passages 111 is one, the number of the sensors is two, the passages 111 have two outlets arranged at intervals in the extending direction thereof, and the decomposition member 12 is connected between the two outlets of the passages 111. One sensor communicates with one of the outlets of the channel 111 and the other sensor communicates with one of the outlets of the channel 111 to the other outlet. After the first gas enters the channel 111 through the inlet of the channel 111, a part of the first gas enters the corresponding sensor through the first outlet for measurement, so that the sensor detects the carbon dioxide concentration of the first gas, the other part of the first gas does not flow out from the first outlet but continuously flows along the channel 111, and is decomposed by the decomposing element 12 to obtain a second gas, and finally, the second gas flows out through the second outlet and then flows out through the corresponding sensor, so that the sensor detects the carbon dioxide concentration of the second gas.

In some embodiments, the detection portion 13 includes a first sensor provided in the first passage and located downstream of the decomposition member 12 in the gas flow path for detecting the carbon dioxide concentration of the second gas in the first passage, and a second sensor. The second sensor is arranged in the second channel and used for detecting the carbon dioxide concentration of the first gas in the second channel.

In actual operation, the first gas in the first channel is decomposed by the decomposition component 12 and enters the first sensor, and the first sensor detects the carbon dioxide concentration of the second gas. The first gas in the second channel directly enters the second sensor, and the carbon dioxide concentration of the first gas is detected by the second sensor. In this case, the air detection device 10 does not need to be provided with a structure like a mounting portion, which contributes to simplification of the structure, circuit control, and the like of the air detection device 10.

In other embodiments, the detection unit 13 may include only one sensor. The description is given by way of example for one sensor and one channel 111. The channel 111 has a proximal outlet and a distal outlet spaced apart along its extension, the proximal outlet being closer to the inlet of the channel 111 than the distal outlet, the disintegrating elements 12 being connected between the two outlets of the channel 111. Air detection device 10 still includes the second installation department, has the second holding chamber in the second installation department, and the second holding intracavity is located to the sensor, and the second installation department has first entry and the second entry with second holding chamber intercommunication, the near exit linkage of first entry and passageway 111, the second entry and the distant exit linkage of passageway 111, and near export is provided with first valve, and distant export is provided with the second valve. When the sensor is used for detecting the first gas in the channel 111, the first valve is communicated with the near outlet and the second accommodating cavity, the second valve is communicated with the far outlet and the second accommodating cavity, the first gas in the channel 111 enters the second accommodating cavity and enters the sensor, and the detection result of the sensor is the carbon dioxide concentration of the first gas at the moment. When the sensor is used for detecting the second gas in the channel 111, the first valve stops the near outlet and the second accommodating cavity, the second valve conducts the far outlet and the second accommodating cavity, the first gas in the channel 111 cannot enter the second accommodating cavity and needs to be decomposed into the second gas through the decomposing piece 12, the second gas enters the second accommodating cavity and enters the sensor, and the detection result of the sensor is the carbon dioxide concentration of the second gas.

In some embodiments, referring to fig. 1 and 2, the sampling portion 11 includes a housing 112 and a pumping portion 113 disposed in the housing 112, the housing 112 forming a channel 111, the pumping portion 113 providing a pumping force for allowing gas to enter the channel 111.

In actual operation, the air exhaust portion 113 is first opened, negative pressure is formed in the channel 111 by the suction force generated by the air exhaust portion 113, and the external first gas enters the channel 111 under the action of the suction force (negative pressure) and flows along the channel 111. When the first gas flows in the passage 111, the first gas can pass through the decomposition member 12 and be decomposed by the decomposition member 12 to obtain the second gas, and the second gas continues to flow to the detection portion 13 by the suction force, so that the detection portion 13 detects the carbon dioxide concentration of the second gas. When the first gas flows in the passage 111, the first gas can directly enter the detection portion 13, and the carbon dioxide concentration of the first gas can be detected by the detection portion 13. Thus, the sampling part 11 can collect the first gas by arranging the air exhaust part 113, the flow in the first gas channel 111 can be accelerated, and the first gas and the second gas can sufficiently enter the sensor, so that the detection precision of the sensor is improved.

It should be noted that when the channel 111 includes a first channel and a second channel, only one pumping portion 113 may be provided, and the first channel and the second channel may simultaneously collect the first gas under the suction force of the same pumping portion 113. When one passage 111 is included, the passage 111 having a proximal outlet and a distal outlet, and the number of sensors is two, the number of the pumping sections 113 may be two, and one pumping section 113 is correspondingly disposed downstream of the gas flow path of one sensor. The specific manner is not limited herein.

The air extracting portion 113 may be an air extracting pump, an air extractor, or another component capable of generating a suction force, and is not limited herein.

In an embodiment, referring to fig. 1 and 2, the housing 112 further forms a pumping chamber 114 in communication with the passage 111, the pumping portion 113 is disposed in the pumping chamber 114, and when the pumping portion 113 provides a pumping force, gas enters the pumping chamber 114 through the passage 111. In actual operation, the suction force generated by the air extracting portion 113 causes the air in the air extracting chamber 114 to flow at a high speed to generate a negative pressure, so that the external first gas can flow through the passage 111 and the air extracting chamber 114 in sequence. The provision of the extraction chamber 114 facilitates the installation of the extraction portion 113.

Further, referring to fig. 1 and 3, the housing 112 has a gas discharge hole 115 communicating with the pumping chamber 114, and the gas pumped to the pumping chamber 114 through the pumping portion 113 is discharged out of the housing 112 through the gas discharge hole 115. In this way, the discharge of the sucked gas is realized. In other embodiments, the pumping unit 113 may be operated in a reverse direction, so that the gas in the pumping chamber 114 is exhausted from the housing 112 through the passage 111 by the pumping unit 113.

In specific embodiments, referring to fig. 1 and 2, the sampling portion 11 further includes a partition 116, the partition 116 is disposed on the housing 112 and partitions the housing 112 to form the passage 111 and the pumping chamber 114, the partition 116 has an installation cavity communicating the passage 111 and the pumping chamber 114, and the detection portion 13 is disposed in the installation cavity. In actual operation, when the gas in the passage 111 passes through the installation cavity, the gas can be absorbed by the detection part 13 to measure the carbon dioxide content. The other portion is exhausted through the mounting cavity into the exhaust plenum 114.

The specific configuration of the partition 116 depends on the number of sensors in the detection unit 13, and is not limited. Alternatively, when the detection portion 13 includes two sensors and the passage 111 includes a first passage and a second passage, the mounting cavity of the partition 116 includes a first mounting cavity and a second mounting cavity which are independent, the first mounting cavity communicates with the first passage and the air exhaust chamber 114, the second mounting cavity communicates with the second passage and the air exhaust chamber 114, the first sensor is disposed in the first mounting cavity, and the second sensor is disposed in the second mounting cavity.

In the present embodiment, when the detection unit 13 detects the carbon dioxide concentration of each gas, only a small amount of the gas component needs to be inhaled.

In some embodiments, referring to fig. 1 and 3, the air detection device 10 further includes a grip 14, the grip 14 being disposed outside of the housing 112. Is convenient for operators to hold. Further, the handle 14 is provided with a switch, and the switch is in control connection with the air extracting portion 113 and is used for starting or stopping the air extracting portion 113. Thus, when the operator holds the grip 14, the air suction unit 113 can be started or stopped by operating the switch, thereby facilitating one-handed operation.

In the air detection device 10 provided in the embodiment of the present application, during actual operation, the sampling portion 11 collects the first gas to enter the channel 111, and the decomposition member 12 can decompose the first gas, detect the carbon dioxide concentration of the first gas that can not be decomposed, and detect the carbon dioxide concentration of the second gas after the first gas is decomposed. The concentration of carbon dioxide obtained by decomposing formaldehyde in the first gas can be obtained by detecting the difference between the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas by the detection unit 13, and the concentration of formaldehyde in the first gas can be obtained. Compared with the prior art, the formaldehyde in the first gas is decomposed by the decomposing element 12 to obtain the second gas, the concentration of the formaldehyde in the first gas is calculated according to the difference value of the concentrations of the carbon dioxide of the first gas and the second gas, the detection cost is low, and the detection precision is high.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An air detection device, comprising:

a sampling portion (11) for collecting a first gas, the sampling portion (11) having a channel (111) for containing the first gas;

a decomposition member (12) provided in the passage (111) for decomposing formaldehyde in the first gas penetrating therethrough to obtain a second gas; and

and a detection unit (13) for detecting the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas to obtain the formaldehyde concentration in the first gas from the difference between the carbon dioxide concentration of the first gas and the carbon dioxide concentration of the second gas.

2. The air detection apparatus according to claim 1, wherein the decomposition member (12) includes a decomposition film made of or coated with a formaldehyde decomposition material.

3. The air detection device according to claim 1, wherein the channel (111) comprises a first channel and a second channel that are not in communication with each other;

the decomposition piece (12) is arranged in the first channel and is used for decomposing the first gas in the first channel to obtain the second gas;

the detection unit (13) is configured to detect a carbon dioxide concentration of the second gas in the first channel and to detect a carbon dioxide concentration of the first gas in the second channel.

4. An air detection device according to claim 3, wherein the size of the disintegrating members (12) corresponds to the size of the passage of the first passage.

5. The air detection device according to claim 3, wherein the detection portion (13) includes a first sensor and a second sensor;

the first sensor is arranged in the first channel and is positioned on the gas flow path at the downstream of the decomposition component (12) and is used for detecting the carbon dioxide concentration of the second gas in the first channel; the second sensor is arranged in the second channel and used for detecting the concentration of the carbon dioxide of the first gas in the second channel.

6. The air detection device according to any one of claims 1 to 5, wherein the sampling portion (11) includes a housing (112), and an air extraction portion (113) provided to the housing (112), the housing (112) forming the passage (111), the air extraction portion (113) providing a suction force for making air enter the passage (111).

7. The air detection apparatus according to claim 6, wherein the housing (112) is further formed with an air extracting chamber (114) communicating with the passage (111), the air extracting portion (113) is provided to the air extracting chamber (114), and when the suction force is supplied from the air extracting portion (113), the air enters the air extracting chamber (114) through the passage (111).

8. The air detection apparatus according to claim 7, wherein the housing (112) has an exhaust hole (115) communicating with the suction chamber (114), and when the suction force is supplied from the suction portion (113), the gas enters the suction chamber (114) through the passage (111) and is exhausted from the housing (112) through the exhaust hole (115).

9. The air detection apparatus according to claim 8, wherein the sampling portion (11) further includes a partition portion (116), the partition portion (116) being provided in the housing (112) and partitioning the housing (112) to form the passage (111) and the suction chamber (114), the partition portion (116) having a mounting cavity communicating the passage (111) and the suction chamber (114);

the detection part (13) is arranged in the mounting cavity.

10. The air detection device of claim 6, further comprising a grip (14), the grip (14) being disposed outside of the housing (112).