CN113739398A - Carbon dioxide gas concentration adjusting device and control method thereof - Google Patents

Carbon dioxide gas concentration adjusting device and control method thereof Download PDF

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Publication number
CN113739398A
CN113739398A CN202111114520.1A CN202111114520A CN113739398A CN 113739398 A CN113739398 A CN 113739398A CN 202111114520 A CN202111114520 A CN 202111114520A CN 113739398 A CN113739398 A CN 113739398A
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gas concentration
module
carbon dioxide
infrared
dioxide gas
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武斌
申涛
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Shenzhen Meisi Xianrui Electronic Co ltd
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Shenzhen Meisi Xianrui Electronic Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F24F2110/70—Carbon dioxide

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Fluid Mechanics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The invention discloses a carbon dioxide gas concentration adjusting device and a control method thereof, wherein the adjusting device comprises a box body arranged in the adjusting device and provided with a ventilation port, and CO2Gas concentration detection module, control module, CO2The gas concentration detection module is connected with the control module; when CO is present2Gas enters the box body through the ventilation port and contacts with the CO2After the gas concentration detection module, CO2The gas concentration detection module detects the content of the current specified gas concentration, and the control module detects the content of the current specified gas concentration according to CO2CO fed back by gas concentration detection module2The electric signal of the content of the gas concentration controls the ventilation quantity of the air conditioning equipment. The invention arranges CO in the box body2The gas concentration detection module and the control module not only realize the indoor CO2The gas concentration is measured, the service life of the carbon dioxide gas concentration adjusting device is prolonged, and the purpose of automatically adjusting the air inlet volume of the air conditioning equipment according to the carbon dioxide gas concentration is realized.

Description

Carbon dioxide gas concentration adjusting device and control method thereof
Technical Field
The invention belongs to the technical field of carbon dioxide concentration adjustment, and particularly relates to a carbon dioxide gas concentration adjusting device and a control method thereof.
Background
With the continuous improvement of the quality of life, more and more rooms are provided with air conditioners in the living and working spaces of people, but in order to reduce the power loss, the tightness of the rooms is more and more strict, and the action directly leads to the poorer and poorer quality of air in the rooms. Carbon dioxide gas is an important component in air content, accounts for about 0.03 percent of the air content, is the main cause of people staying in a relatively closed space for a long time to generate a feeling of dizziness, fainting and sinking, and the concentration of the carbon dioxide gas represents the quality of the air to a certain extent.
At present, the fresh air conditioner realizes the ventilation function of indoor and outdoor air, but does not automatically adjust the ventilation volume according to the concentration of indoor carbon dioxide gas, so that the problems of high operation cost and high power energy consumption are caused.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a carbon dioxide gas concentration adjusting device, which solves the problem that the air volume of an air conditioning device cannot be automatically adjusted according to the carbon dioxide gas concentration in the prior art.
The invention also aims to provide a control method of the carbon dioxide gas concentration adjusting device.
In order to achieve the purpose, the technical scheme of the invention is realized as follows: a carbon dioxide gas concentration regulating device is arranged in air conditioning equipment and comprises a box body with a ventilation opening arranged therein and CO2Gas concentration detection module, control module, CO2The gas concentration detection module is connected with the control module; when CO is present2Gas enters the box body through the ventilation port and contacts with the CO2After the gas concentration detection module, the CO2The gas concentration detection module detects the content of the current specified gas concentration, and the control module detects the content of the current specified gas concentration according to CO2CO fed back by gas concentration detection module2Of gas concentrationThe content electric signal controls the ventilation quantity of the air conditioning equipment.
Preferably, the carbon dioxide gas concentration adjusting device further includes CO2Gas concentration alarm module and display module, CO2The gas concentration alarm module and the display module are connected with the control module.
Preferably, the CO is2The gas concentration detection module comprises an upper cover body, a bottom plate, an infrared light source, an infrared thermopile gas sensor and a waterproof breathable film, wherein the upper cover body and the bottom plate are connected in a matched manner to detect CO2Gas concentration's air chamber, infrared light source and infrared thermopile gas sensor set up in the air chamber and with bottom plate fixed connection, waterproof ventilated membrane setting is used for avoiding outside atmospheric water vapour composition to get into the air chamber influence and detects CO in the top of last lid2The gas concentration.
Preferably, the infrared thermopile gas sensor comprises a filtering module, an infrared thermopile module, an analog front-end module and a pin column, wherein the input end of the analog front-end module is connected with the infrared thermopile module, and the output end of the analog front-end module is connected with the pin column;
CO2after the gas contacts the filtering module, the infrared thermopile module detects CO2Content of gas concentration, said CO2And the electric signal with the content of the gas concentration enters an analog front-end module to be amplified and subjected to analog-to-digital conversion to obtain a digital signal, and the digital signal is communicated with the outside through a pin column.
Preferably, this thermopile infrared sensor further includes the base, infrared thermopile module, simulation front end module and pin post all set up on the base, and infrared thermopile module is located base central point and puts.
Preferably, the filter module comprises a filter and a cap, and the filter is located on the cap.
Preferably, the input end of the analog front-end module is connected with the infrared thermopile module through a lead; the output end of the analog front-end module is connected with the pin column through a gold thread.
Preferably, the number of the optical filters is matched with that of the infrared thermopile modules.
Preferably, the infrared thermopile module is an infrared thermopile chip; the analog front-end module is an NTC chip; the filter can filter out infrared rays with specific wavelengths.
The other technical scheme of the invention is realized as follows: a control method of the carbon dioxide gas concentration adjustment device described above, the control method comprising the steps of:
s1, starting the carbon dioxide gas concentration adjusting device, and CO2Gas concentration detection module detects current CO in real time2The content of gas concentration;
s2, judging the current CO2CO whether the content of the gas concentration is at a preset value2If the gas concentration is within the content threshold value, executing S3, and if the gas concentration is not within the content threshold value, continuing executing the current process;
s3, the control module is according to CO2CO fed back by gas concentration detection module2The air concentration signal controls the ventilation volume of the air conditioning equipment.
Compared with the prior art, the invention arranges CO in the box body2The gas concentration detection module and the control module not only realize the application of NDIR detection technology to indoor CO2The gas concentration is measured, the service life of the carbon dioxide gas concentration adjusting device is prolonged, and the purpose of automatically adjusting the air inlet volume of the air conditioning equipment according to the carbon dioxide gas concentration is realized.
Drawings
Fig. 1 is a schematic perspective view of a carbon dioxide gas concentration adjusting device provided in embodiment 1 of the present invention;
fig. 2 is a schematic exploded view of a carbon dioxide gas concentration adjusting device provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a gas concentration detection module in a carbon dioxide gas concentration adjustment device according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural diagram of a dual-channel infrared thermopile gas sensor in a carbon dioxide gas concentration adjusting apparatus according to embodiment 1 of the present invention;
FIG. 5 is an equivalent circuit diagram of an NTC chip in a dual-channel infrared thermopile gas sensor in a carbon dioxide gas concentration adjusting apparatus according to embodiment 1 of the present invention;
FIG. 6 is a schematic structural diagram of a single-channel infrared thermopile gas sensor in a carbon dioxide gas concentration regulating apparatus according to embodiment 1 of the present invention;
FIG. 7 is an equivalent circuit diagram of an NTC chip in a single-channel infrared thermopile gas sensor in a carbon dioxide gas concentration adjusting apparatus according to embodiment 1 of the present invention;
fig. 8 is a block flow chart of a control method of a carbon dioxide gas concentration adjustment device according to embodiment 2 of the present invention.
In the figure, 1, a box body, 11, a ventilation port, 2, a gas concentration detection module, 3, a control module, 4, an alarm, 5, a display module, 1, a filtering module, 2, a thermopile module, 21, a cover body, 22, a bottom plate, 23, an infrared light source, 24, an infrared thermopile gas sensor, 241, a filtering module, 2411, a light filter, 2412, a pipe cap, 242, an infrared thermopile module, 243, an analog front end module, 244, a pin column, 245, a base and 25 are waterproof breathable films.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or member to which the present invention is directed must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The carbon dioxide gas concentration regulating device provided by the embodiment of the invention is arranged in air conditioning equipment and comprises a box body 1 internally provided with a ventilation port 11 and CO2Gas concentration detection module 2, control module 3, CO2The gas concentration detection module 2 is connected with the control module 3; when CO is present2The gas enters the box body 1 through the ventilation port 11 and contacts CO2After the gas concentration detection module 2, CO2The gas concentration detection module 2 detects the content of the current specified gas concentration, and the control module 3 detects the content of the current specified gas concentration according to CO2CO fed back by gas concentration detection module 22The electric signal of the content of the gas concentration controls the ventilation quantity of the air conditioning equipment.
After adopting the proposal, CO is arranged in the box body 12The gas concentration detection module 2 and the control module 3 not only realize the application of NDIR detection technology to indoor CO2The gas concentration is measured, the service life of the carbon dioxide gas concentration adjusting device is prolonged, and the purpose of automatically adjusting the air inlet volume of the air conditioning equipment according to the carbon dioxide gas concentration is realized.
Further, the carbon dioxide gas concentration adjusting device further comprises CO2Gas concentration alarm module and display module 5, CO2The gas concentration alarm module and the display module 5 are connected with the control module 3.
Thus, by setting up CO2A gas concentration alarm module and a display module 5, and CO2The gas concentration alarm module 4, the display module 5 and the control module 3 are connected, so that reminding is effectively realizedIndoor CO2Whether the gas concentration is normal or not and real-time display of indoor CO2The gas concentration is achieved, and the market competitiveness and the quality of the whole device are improved.
Further, the CO is2The gas concentration alarm module comprises an alarm 4 and a remote alarm assembly, the control module 3 sends an alarm signal to the alarm 4 to give an alarm, and the alarm signal is sent to external electronic equipment to give an alarm through the remote alarm assembly.
Like this, through setting up alarm 4 and remote alarm subassembly to couple together control module 3 and alarm 4 and remote alarm subassembly, effectual indoor CO of having realized reminding2The concentration is normal, and further market competitiveness and quality of the whole device are improved.
Wherein remote alarm subassembly can with cell-phone direct communication, namely behind the special APP of user's cell-phone installation, can read alarm information and CO that control module sent2And (4) concentration information.
The remote alarm component can be one or more of a low-power Bluetooth BLE module, a Wifi module, a ZigBee module, a Lora module, an NB-IOT module or a 4G-CAT1 module.
When the remote alarm assembly is a low-power-consumption Bluetooth BLE module, a plurality of COs (carbon monoxide) can be arranged in a plane area with a certain area through a Bluetooth Mess function2The gas alarm device forms a network, and a user can operate a special APP through a mobile phone and read data of any node in the network in the area of the local area network;
when the remote alarm component is a Wifi module, a plurality of COs are arranged in a plane area with a certain area2Control module in the gas alarm device can be connected with wireless router through the Wifi module, constitutes the LAN, perhaps connects the high in the clouds server through wireless router, regularly uploads data, perhaps reports alarm information in proruption.
When the remote alarm component is a ZigBee module, a plurality of COs can be arranged in a plane area with a certain area2The gas alarm device forms a network, and all data are uploaded to the cloud end by the main node after being gathered to the ZigBee main node.
When the remote alarm assembly is a Lora module, a network can be formed in a three-dimensional area, and all CO in the whole three-dimensional area2The data of the control module 3 in the gas alarm device can be sent to the Lora server in real time, and the Lora server sends the data to the cloud.
When the remote alarm component is an NB-IOT or 4G-CAT1 module, all COs in a larger area2The data of the control module 3 in the gas alarm device can be connected with a communication base station through an NB-IOT module or a 4G-CAT1 module and directly sent to the cloud.
When the remote alarm subassembly is wireless module, constitutes the LAN, and the user can operate special APP in the cell-phone, directly reads the data of an arbitrary node in the LAN in the region of LAN, and the high in the clouds is also sent to the data simultaneously, and special APP in the user's operatable cell-phone visits the data of an arbitrary node in the high in the clouds in any place, sends emergency alarm information to the high in the clouds back, and the high in the clouds can direct propelling movement report to the police to user's cell-phone.
When the remote alarm component power carrier module is arranged in a three-dimensional area, a power carrier main node is arranged in a power control room or a monitoring room, and the main node can be directly connected with each natural gas alarm device in the three-dimensional area through a 220V live wire.
Further, as shown in FIG. 3, CO2The gas concentration detection module 2 comprises an upper cover body 21, a bottom plate 22, an infrared light source 23, an infrared thermopile gas sensor 24 and a waterproof breathable film 25, wherein the upper cover body 21 and the bottom plate 22 are connected in a matching manner to form a CO detection2Gas concentration's air chamber, infrared light source 23 and infrared thermopile gas sensor 24 set up in the air chamber and with bottom plate 22 fixed connection, waterproof ventilated membrane 25 sets up in the top of upper cover body 21 and is used for avoiding outside atmospheric water vapour composition to get into the air chamber influence and detect CO2The gas concentration.
Furthermore, the waterproof breathable film 25 is formed by pressing a polypropylene fabric, a high-molecular breathable film, a network reinforcing rib and the polypropylene fabric through a hot melt adhesive layer, so that the influence of external atmospheric water vapor components entering the air chamber on the detection of CO can be effectively avoided2The gas concentration.
Further, as shown in fig. 4 and 6, the infrared thermopile gas sensor 24 includes a filter module 241, an infrared thermopile module 242, an analog front end module 243 and a pin post 244, wherein an input end of the analog front end module 243 is connected with the infrared thermopile module 242, and an output end is connected with the pin post 244;
CO2after the gas contacts the filter module 241, the infrared thermopile module 242 detects CO2Content of gas concentration, CO2The electrical signal with the gas concentration content enters the analog front end module 243 for amplification and analog-to-digital conversion to obtain a digital signal, and the digital signal is communicated with the outside through the pin 244.
Thus, with the above structure, CO2After infrared radiation energy emitted by the gas passes through the filtering module 241, the infrared radiation energy is absorbed by the thermopile module 242 to generate a thermoelectric signal, the thermoelectric signal enters the analog front-end module 243 to be amplified and subjected to analog-to-digital conversion to obtain a digital signal, and the digital signal is communicated with the outside through the pin 244;
in the above process, the thermopile module and the analog front-end module are integrated in this embodiment, and compared with the prior art that an analog sensor is required to be used in combination with a peripheral signal amplifying circuit and a signal processing circuit, the thermopile front-end module obviously reduces the volume and the complexity of the peripheral circuit on the premise of consistent functions.
In the embodiment, the thermopile module 242 and the analog front-end module 243 are integrated, and compared with the prior art that an analog sensor is required to be used in combination with a peripheral signal amplifying circuit and a signal processing circuit, the size is obviously reduced and the complexity of the peripheral circuit is reduced on the premise of consistent functions.
Further, the infrared thermopile infrared sensor further includes a base 245, the infrared thermopile module 242, the analog front end module 243, and the pin column 244 are all disposed on the base 245, and the infrared thermopile module 242 is located at the center of the base 245.
Further, the filtering module 241 includes a filter 2411 and a cap 2412, and the filter 2411 is disposed on the cap 2412.
Further, the input end of the analog front end module 243 is connected to the infrared thermopile module 242 through a wire (preferably a gold wire); the output of the analog front end module 243 is connected to the pin 244 through a gold wire.
Specifically, the filter 2411 may filter out infrared rays of a specific wavelength;
specifically, moisture, carbon dioxide, and the like in the atmosphere have a strong absorption effect on infrared light with a specific wavelength, and if infrared radiation in the whole wavelength range emitted by an object is allowed to pass through the sensor optical window, the radiation energy received by the thermopile sensor is easily interfered by the concentration of atmospheric components, so that the output result of the sensor is affected. The silicon-based infrared filter loaded on the optical window of the sensor can selectively transmit infrared light in a specific wavelength range, and by designing the transmission-cut-off wavelength parameters of the filter, an atmospheric absorption waveband causing interference can be shielded outside the sensor, so that the radiation energy received by the thermopile sensor is only related to the surface temperature of a measured object and is not interfered by the concentration of atmospheric components.
Further, the input end of the analog front end module 243 is connected to the infrared thermopile module 242 through a gold wire; the output of the analog front end module 243 is connected to the pin 244 through a gold wire.
Further, at least two optical filters 2411 and at least two infrared thermopile modules 242 are arranged, and the number of the optical filters 2411 is matched with that of the infrared thermopile modules 242.
In a specific embodiment, when the optical filter 2411 and the infrared thermopile module 242 are configured as one, the infrared thermopile infrared sensor formed by the optical filter 2411 is a single-channel infrared thermopile gas sensor, as shown in fig. 6 in particular; when the filter 2411 and the infrared thermopile module 242 are provided in two, the infrared thermopile infrared sensor formed by the filter is a dual-channel infrared thermopile gas sensor, as shown in fig. 4.
Further, the thermopile module 242 is an infrared thermopile chip; the analog front end module 243 is an NTC chip.
The NTC chip is used for monitoring the ambient temperature of the thermopile sensor and compensating the output voltage of the thermopile sensor.
When the two-channel infrared thermopile gas sensor W is adopted, the signal processing circuit is shown in FIG. 5 and comprises an NTC voltage division bridge circuit and a signal processing circuit; the signal processing circuit differentially amplifies a uV level weak voltage Vtp output by the infrared thermopile sensor W by using a low-noise zero-temperature-drift operational amplifier U, wherein the amplification factor G is determined by a resistor R1 and a resistor R3;
Figure BDA0003274810210000101
after the voltage signal is amplified, VoutAnd converting the ICI into a digital signal through an analog-to-digital converter, and calculating a gas concentration algorithm:
Vtp＝(Vout-Vref)/G
the NTC voltage division bridge circuit measures the resistance of an NTC chip 243 in the infrared thermopile sensor W by matching with the resistance R5 through the voltage division principle by adopting the bridge circuit:
Figure BDA0003274810210000102
and converting the acquired NTC divided voltage into a digital signal through an analog-to-digital converter (ICI) to compensate the output voltage of the sensor.
The software algorithm is designed based on the beer-Lambert law, i.e.
I1＝I0e-klx
Wherein, I1Denotes the density of the target gas, I0Denotes the density of the zero gas, k denotes the absorption coefficient of the particular gas and filter combination, l denotes the equivalent optical length of the infrared light source and infrared thermopile sensor, and x denotes the gas concentration.
For NDIR applications, the measured gas does not absorb all of the infrared light at its infrared absorption peak, so the beer-Lambert law is modified to fit the practical application for measurement, i.e., measurement
Figure BDA0003274810210000111
Wherein m represents the absorption capacity of the gas to be detected, and the value is less than 1; n represents an increase in the power term due to changes in the optical path length and scattering requirements of the light, which can make the equation fit exactly to the actual absorption data.
The calibration steps and the algorithm of the W gas concentration of the dual-channel infrared thermopile sensor in the signal processing algorithm are as follows:
1) injecting N into the gas chamber2Waiting for the gas to be stabilized, and constructing a zero-concentration environment of the gas to be detected;
2) measuring peak-to-peak output V of a working channel1Peak to peak output of the reference channel, V0And a current ring temperature T0;
3) calculating W zero position Z of infrared thermopile sensor0(reference channel and working channel are in CO2Ratio of gas concentration to zero)
Figure BDA0003274810210000112
4) Injecting the measured gas with concentration of x1 into the gas chamber, and measuring the peak output V of the working channel4Peak output of reference channel V3And the current ambient temperature T1The concentration relationship is as follows:
Figure BDA0003274810210000113
Figure BDA0003274810210000114
where FA represents the fractional absorption of the gas.
5) The temperature coefficients of the parameters m and FA are calculated according to the formula
mT＝m0+i0*(T-T0)
(1-FAT)＝(1-FA)*(1+j*(T-T0))
Where mT represents the value at ambient temperature T, m0The expression is the value obtained at calibration, i0Temperature coefficient, T, representing parameter m0Represents the ambient temperature at calibration; FAT indicates a value at which the ring temperature is T, FA is a value obtained by calibration, and j indicates a temperature coefficient of the parameter FA. From the two parameters temperature coefficient, the temperature compensation of the coefficient m at various concentrations can be calculated, i.e.
mT＝m0+i*(T-T0)
Where i represents the correction coefficients of the parameters m and FA.
6) And calculating the concentration of the measured gas.
Figure BDA0003274810210000121
A plurality of communication protocols such as Bluetooth, WiFi and other wireless protocols are integrated in the algorithm, communication can be carried out with the outside, and behavior control is carried out by matching with external equipment. In addition, in order to facilitate the wired communication of users, a contact pin interface is reserved on the PCB board, so that the external connection is facilitated.
In the examples of the present invention CO2The gas concentration measuring module 2 is mainly used for detecting the concentration of carbon dioxide gas, CO, in a room2The gas concentration measuring module is arranged in an industry standard carbon dioxide gas concentration adjusting device (namely a box body 1), and as shown in figure 1, ventilation openings 11 are formed in the periphery of the box body 1 and used for allowing indoor air to flow, so that the indoor air is diffused into the device, and the indoor carbon dioxide gas concentration can be conveniently tested.
The display module 5 displays CO2The gas concentration measurement module 2 reads and has built-in wireless communication. The display module 5 is provided with a low-power-consumption display module which can be a negative segment code LCD, an off-white dot matrix LCD module, a low-power-consumption TFTLCD module or an OLED module.
In addition, as shown in fig. 7, an equivalent circuit diagram of the analog front end module 243 is shown, and as can be seen from fig. 7, the pairCO2The voltage signal output by the gas concentration detection module 2 is sent to the main control chip IC2 for algorithm processing after signal amplification and analog-to-digital conversion, and finally the current carbon dioxide gas concentration is obtained.
In addition, as can be seen from fig. 7, the output voltages of the first to third pins of the infrared thermopile module 242 are amplified by the operational amplifier U, and the second to fourth pins of the infrared thermopile sensor W are converted into voltage signals by the voltage dividing circuit, and then the voltage signals are respectively sent to the analog-to-digital converter IC1 to convert the voltage analog signals into digital signals for external communication.
The input end of the analog front end module (NTC chip) 243 is connected to the infrared thermopile module 242 by gold wires.
The output terminal of the analog front end module (NTC chip) 243 is connected to the pin post 244 through a gold wire.
The working process of the thermopile infrared sensor integrated with the analog front end provided by the embodiment mainly comprises the following steps:
firstly, an object to be measured emits infrared radiation energy, and the optical filter 11 filters out unwanted infrared rays and retains the needed infrared rays;
step two, the infrared thermopile module 242 absorbs and generates a thermoelectric signal, and the hot spot signal enters an analog front end module (NTC chip) 243 through a gold wire;
in the analog front end module (NTC chip) 243, the thermoelectric signal first enters the input selector, then the amplifier U amplifies the signal, and then the digital-to-analog converter IC1 converts the analog signal into a digital signal, which can be communicated with the outside through different interfaces.
The infrared thermopile sensor W integrated with an analog front end provided by the embodiment has the following advantages:
firstly, miniaturization is realized, specifically:
in the prior art, an infrared thermopile sensor W is needed to be matched with a peripheral signal amplifying circuit and a signal processing circuit, so that the peripheral circuit is overstaffed and complicated; in the case that the functions of the present embodiment are the same as those of the prior art, the volume of the present embodiment is miniaturized, which lays a foundation for the miniaturization of the subsequent modules of the user.
Secondly, improve user development efficiency, specifically do:
the output digital signal of the embodiment can be directly communicated with the main control chip IC2 without the need of processing the original voltage signal by a user, thereby improving the development efficiency and saving the time.
Finally, the cost is reduced, specifically:
the analog front end module (NTC chip) 243 can receive two paths of infrared thermopile sensor W signals, can be perfectly matched with NDIR dual-channel gas measurement, and can convert the NDIR dual-channel gas measurement signals into digital signals by using only one NTC chip.
The use principle of the carbon dioxide gas concentration adjusting device provided by the embodiment 1 of the invention is as follows:
the device is mainly installed on an indoor wall, indoor air enters the device from the air holes 11 formed in the box body (namely the carbon dioxide gas concentration adjusting device) 1 through natural diffusion, and CO is integrated in the device2Gas concentration measuring module 2, when carbon dioxide gas enters CO2After the gas concentration measuring module 2, the carbon dioxide gas has the absorption effect on the infrared radiation with a specific wavelength, so that CO2The output signal of the sensor in the gas concentration measuring module 2 is changed, and the concentration content of the current carbon dioxide gas can be calculated according to the beer-Lambert gas absorption law; the measured carbon dioxide gas concentration data can be communicated with the air conditioner through different communication protocols or wired connection, so that the ventilation quantity can be intelligently controlled according to the indoor carbon dioxide gas concentration in the fresh air mode of the air conditioner.
Example 2
As shown in fig. 8, a control method of a carbon dioxide gas concentration adjustment device according to embodiment 2 of the present invention includes the following steps:
s1, starting the carbon dioxide gas concentration adjusting device, and CO2Gas concentration detection module 2 detects current CO in real time2The content of gas concentration;
s2, judging the current CO2CO whether the content of the gas concentration is at a preset value2If the gas concentration is within the content threshold value, executing S3, and if the gas concentration is not within the content threshold value, continuing executing the current process;
s3, the control module 3 controls the air conditioner according to CO2CO fed back by gas concentration detection module 22The air concentration signal controls the ventilation volume of the air conditioning equipment.
After the scheme is adopted, by adopting the control method in the embodiment 2 of the invention, the aim of measuring the indoor carbon dioxide gas concentration by using an NDIR detection technology is fulfilled, the service life of the carbon dioxide gas concentration adjusting device is prolonged, and the aim of automatically adjusting the air intake volume of the air conditioning equipment according to the carbon dioxide gas concentration is fulfilled.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The carbon dioxide gas concentration regulating device is arranged in air conditioning equipment and is characterized by comprising a box body (1) internally provided with a ventilation port (11), and CO2A gas concentration detection module (2), a control module (3), the CO2The gas concentration detection module (2) is connected with the control module (3); when CO is present2Gas enters the box body (1) through the ventilation port (11) and contacts the CO2After the gas concentration detection module (2), the CO2The gas concentration detection module (2) detects the content of the current specified gas concentration, and the control module (3) detects the content of the current specified gas concentration according to CO2CO fed back by gas concentration detection module (2)2The electric signal of the content of the gas concentration controls the ventilation quantity of the air conditioning equipment.
2. The method according to claim 1, wherein the carbon dioxide gas is used as a carbon dioxide gasA regulating device, characterized in that the carbon dioxide gas concentration regulating device also comprises CO2A gas concentration alarm module and a display module (5), the CO2The gas concentration alarm module and the display module (5) are connected with the control module (3).
3. The apparatus for adjusting carbon dioxide gas concentration according to claim 2, wherein the CO is2The gas concentration detection module (2) comprises an upper cover body (21), a bottom plate (22), an infrared light source (23), an infrared thermopile gas sensor (24) and a waterproof breathable film (25), wherein the upper cover body (21) and the bottom plate (22) are connected in a matching manner to form CO detection2Gas concentration's air chamber, infrared light source (23) and infrared thermopile gas sensor (24) set up in the air chamber and with bottom plate (22) fixed connection, waterproof ventilated membrane (25) set up the top of last lid (21) and are used for avoiding outside atmosphere steam composition to get into the air chamber influence and detect CO2The gas concentration.
4. A carbon dioxide gas concentration regulating device according to claim 3, characterized in that the infrared thermopile gas sensor (24) comprises a filter module (241), an infrared thermopile module (242), an analog front end module (243) and a pin column (244), wherein the analog front end module (243) has an input connected with the infrared thermopile module (242) and an output connected with the pin column (244);
CO2after the gas contacts the filtering module (241), the infrared thermopile module (242) detects CO2Content of gas concentration, said CO2The electric signal of the content of the gas concentration enters an analog front end module (243) for amplification and analog-to-digital conversion to obtain a digital signal, and the digital signal is communicated with the outside through a pin column (244).
5. A carbon dioxide gas concentration regulating device according to claim 4, characterized in that the thermopile infrared sensor further comprises a base (245), the infrared thermopile module (242), the analog front end module (243) and the pin column (244) are all disposed on the base (245), and the infrared thermopile module (242) is located at the center of the base (245).
6. The carbon dioxide gas concentration regulating device according to claim 5, wherein the filter module (241) comprises a filter (2411) and a cap (2412), and the filter (2411) is located on the cap (2412).
7. A carbon dioxide gas concentration regulating device according to claim 6, characterized in that the input end of the analog front end module (243) is connected with the infrared thermopile module (242) through a lead; the output end of the analog front end module (243) is connected with the pin column (244) through a gold wire.
8. The carbon dioxide gas concentration regulating device according to claim 7, wherein the number of the optical filters (2411) and the number of the infrared thermopile modules (242) are at least two, and the number of the optical filters (2411) is matched with the number of the infrared thermopile modules (242).
9. A carbon dioxide gas concentration regulating device according to any one of claims 4 to 8, wherein said infrared thermopile module (242) is an infrared thermopile chip; the analog front-end module (243) is an NTC chip; the filter (2411) may filter out infrared rays of a specific wavelength.
10. A control method of the carbon dioxide gas concentration adjusting apparatus according to any one of claims 1 to 9, characterized by comprising the steps of:
s1, starting the carbon dioxide gas concentration adjusting device, and CO2The gas concentration detection module (2) detects the current CO in real time2The content of gas concentration;
s2, judging the current CO2CO whether the content of the gas concentration is at a preset value2If not, S3 is executed, and if yes,continuing to execute the current procedure;
s3, the control module (3) controlling the operation according to CO2CO fed back by gas concentration detection module (2)2The air concentration signal controls the ventilation volume of the air conditioning equipment.
CN202111114520.1A 2021-09-23 2021-09-23 Carbon dioxide gas concentration adjusting device and control method thereof Pending CN113739398A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111114520.1A CN113739398A (en) 2021-09-23 2021-09-23 Carbon dioxide gas concentration adjusting device and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111114520.1A CN113739398A (en) 2021-09-23 2021-09-23 Carbon dioxide gas concentration adjusting device and control method thereof

Publications (1)

Publication Number Publication Date
CN113739398A true CN113739398A (en) 2021-12-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111114520.1A Pending CN113739398A (en) 2021-09-23 2021-09-23 Carbon dioxide gas concentration adjusting device and control method thereof

Country Status (1)

Country Link
CN (1) CN113739398A (en)

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