CN215066145U - Small-volume air pipe insertion type infrared carbon dioxide detection device - Google Patents
Small-volume air pipe insertion type infrared carbon dioxide detection device Download PDFInfo
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- CN215066145U CN215066145U CN202120154880.3U CN202120154880U CN215066145U CN 215066145 U CN215066145 U CN 215066145U CN 202120154880 U CN202120154880 U CN 202120154880U CN 215066145 U CN215066145 U CN 215066145U
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Abstract
The utility model discloses a small-volume air duct plug-in type infrared carbon dioxide detection device, which comprises an outer shell, an air chamber cylinder, a light source assembly, a main control plate assembly, a battery, a window cover plate and an end cover plate, wherein the outer shell is of a cylindrical structure and is internally provided with a containing groove and a containing cavity, the containing groove is of an open structure and is formed with a window on the peripheral surface of the outer shell, and the window cover plate covers the window to close the containing groove; the main control board assembly is provided with a photoelectric detector, the light source assembly and the main control board assembly are respectively arranged at two ends of the air chamber cylinder, and a light emitting end of the light source assembly and a receiving end of the photoelectric detector are communicated with the inside of the air chamber cylinder; the detachable setting of air chamber section of thick bamboo, light source subassembly and main control board subassembly is accomodating the inslot, and the battery setting is accomodating the intracavity, and one end is passed through the end cover and is sealed accomodating the chamber. The utility model discloses reduced the volume greatly, can directly peg graft inside the tuber pipe, do not additionally occupy the equipment exterior space, the consumption is little, can adopt the direct power supply of battery.
Description
[ technical field ] A method for producing a semiconductor device
The utility model belongs to the technical field of gas concentration detects, especially, relate to a bayonet infrared carbon dioxide detection device of little volume tuber pipe.
[ background of the invention ]
Carbon dioxide is denser than air and less harmful to humans, but it exceeds a certain amount and affects the respiration of humans (other living things are) because of increased concentration of carbonic acid in blood, increased acidity and acidosis.
The concentration and the content of carbon dioxide can influence the daily work and rest of human beings, and the concentration and the content of carbon dioxide and the physiological reaction of human bodies are as follows:
350-450 ppm: the same general outdoor environment is adopted,
350-1000 ppm: the air is fresh, the breath is smooth,
1000-2000 ppm: air was perceived to be turbid and begin to be drowsy,
2000-5000 ppm: headache, lethargy, dull, inattentive, accelerated heartbeat, mild nausea,
greater than 5000 ppm: can lead to severe hypoxia, resulting in permanent brain damage, coma, and even death.
Carbon dioxide detecting instruments become indispensable equipment in various industries, for example, carbon dioxide concentration in blown gas needs to be detected in an air conditioner pipeline, the phenomenon that the carbon dioxide concentration in the gas blown into a room is too high and the harm to human health is avoided, however, the diameter of an air conditioner air pipe is small, the existing air pipe type carbon dioxide sensor is generally composed of a sensor shell with an air pipe detecting probe, the size of the sensor is large, an infrared sensor probe with digital output is integrated in the sensor, the infrared sensor probe is externally connected with direct current or alternating current for power supply, a communication interface mode is a 4-20mA or RS-485 interface, power consumption is large, power cannot be supplied through a battery, and wiring cost of a power supply and a communication line is high; the space occupied in the air conditioner is large.
Therefore, it is necessary to develop a small-volume air duct insertion type infrared carbon dioxide detecting device to solve the above problems.
[ Utility model ] content
The utility model discloses a main aim at provides a bayonet infrared carbon dioxide detection device of little volume tuber pipe has reduced holistic volume greatly, can directly peg graft inside the tuber pipe, does not additionally occupy the equipment exterior space, and the consumption is little, can adopt dry battery direct power supply.
The utility model discloses a following technical scheme realizes above-mentioned purpose: a small-volume air pipe insertion type infrared carbon dioxide detection device comprises an outer shell, an air chamber cylinder, a light source component, a main control board component, a battery, a window cover plate and an end cover plate, wherein the outer shell is of a cylindrical structure, a containing groove and a containing cavity are formed in the outer shell, the containing groove is of an open structure, a window is formed in the outer peripheral surface of the outer shell, and the window cover plate is detachably covered on the window to seal the containing groove; the main control board assembly is provided with a photoelectric detector, the light source assembly and the main control board assembly are respectively arranged at two ends of the air chamber cylinder, and a light emitting end of the light source assembly and a receiving end of the photoelectric detector are communicated with the inside of the air chamber cylinder; the air chamber barrel, the light source assembly and the main control board assembly are detachably arranged in the containing groove, the battery is arranged in the containing cavity, and one end of the battery is sealed through the end cover plate to form the containing cavity.
Further, still include an installed part, the shell body passes through screw locking on the installed part, or alternate in the jack of installed part, the installed part passes through screw locking on ventilation pipe.
Further, an air cavity is formed inside the air chamber cylinder; an air inlet hole and an air outlet hole which are communicated with the air cavity are formed in the air chamber cylinder; the air inlet hole is arranged close to the light source component, and the air outlet hole is arranged close to the photoelectric detector; the window cover plate is provided with a first air vent corresponding to the air inlet hole or the air outlet hole.
Further, the inner wall surface of the air cavity is coated with a gold plating layer.
Further, the light source assembly comprises a light source fixing plate and an LED light source arranged on the light source fixing plate; the LED light source is a narrow-band LED light source, the wavelength range of the light source is 0-5 mu m, and the power is less than 1 mW.
Further, the centers of the LED light source and the photoelectric detector are located on the same straight line, and the straight line is parallel to or collinear with the axis of the air chamber cylinder.
Further, a microprocessor MCU, an LED light source driving module, a detector signal processing module, a communication module and a power circuit are integrated on the main control board assembly, and the microprocessor MCU is electrically connected with the LED light source driving module, the detector signal processing module, the communication module and the power circuit; the power supply circuit converts and stabilizes the voltage output by the battery and then supplies power to the microprocessor MCU, the communication module, the LED light source driving module and the detector signal processing module.
Further, the LED light source driving module comprises a pulse generator, a pulse signal power driving amplifier and a singlechip pulse width adjusting generator;
the detector signal processing module comprises a photocurrent voltage converter, a small signal amplifier and a filter; the photoelectric current-voltage converter is composed of an operational amplifier current-voltage conversion circuit, the photoelectric detector converts light energy into a tiny current signal, the tiny current signal is amplified by the small signal amplifier, and then passes through the filter to filter out direct current components and high-frequency noise in the signal, and finally the signal is converted into a voltage signal.
Further, the communication module is a Lora communication module.
Further, the communication module further comprises an antenna assembly; the antenna assembly is a sucker antenna with a leading-out wire and is fixed on the ventilation pipeline in a sucker mode.
Compared with the prior art, the utility model relates to a bayonet infrared carbon dioxide detection device of little volume tuber pipe's beneficial effect lies in:
1) the light source driving MCU, the detector signal processing MCU and the communication MCU in the traditional structure are integrated into a main control board, so that the installation cost and space of a circuit board are saved, the whole size is greatly reduced, and the cost is reduced;
2) the light source assembly, the main control panel assembly and the air chamber cylinder form an integral structure and are arranged in the cylindrical cylinder, so that the integral volume of the detection device is further reduced, the occupied space is greatly reduced, and the application range is expanded;
3) the mounting piece is arranged at the end part of the cylindrical shell, and is directly mounted in the ventilation pipe in a bolt mounting mode, so that the mounting and dismounting are convenient; the surface of the cylindrical barrel shell is provided with the window and the window cover plate, so that the light source assembly, the main control plate assembly and the air chamber barrel in the cylindrical barrel shell can be maintained and replaced conveniently, and the convenience of maintenance is provided;
4) meanwhile, a micro-power-consumption LED light source is adopted, low-power-consumption Lora communication is adopted, the power consumption of the whole machine is 3-5 mW, the power consumption of the sensor is greatly reduced, and the purpose of supplying power by using one dry battery is realized; the optical path of the sensor adopts a linear optical path, so that the optical wave energy loss formed by a plane or spherical reflection type optical path junction adopted by a common air duct type carbon dioxide sensor is avoided, and the resolution of the sensor can be obviously improved;
5) greatly reduces the manufacturing cost and improves the market competitiveness.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic diagram of an explosive structure according to an embodiment of the present invention;
fig. 3 is a schematic side perspective structure view of the embodiment of the present invention;
fig. 4 is a schematic diagram of a frame principle of a main control board assembly in an embodiment of the present invention;
the figures in the drawings represent:
100 small-volume air pipes are inserted into the infrared carbon dioxide detection device;
1 outer shell, 11 containing groove, 12 containing cavity, 13 first vent hole; 2 air chamber cylinder, 21 air chamber, 22 air inlet and 23 air outlet; 3 light source assembly, 31 light source fixing plate, 32LED light source; 4, a main control board component, 41, a photoelectric detector; 5, a battery; 6 window cover plate, 61 second vent hole; 7 end cover plates; 8, mounting parts, 81 mounting panels, 82 threaded hole seats and 83 jack seats; 9, an antenna component, 91, an antenna fixing seat and 92; 10 filtration membrane.
[ detailed description ] embodiments
The first embodiment is as follows:
referring to fig. 1 to 4, the present embodiment is an infrared carbon dioxide detecting device 100 with a small volume inserted into an air duct, which includes an outer casing 1, an air chamber cylinder 2, a light source assembly 3, a main control panel assembly 4, a battery 5, a window cover plate 6 and an end cover plate 7, wherein the outer casing 1 is in a cylindrical structure and is internally provided with an accommodating groove 11 and an accommodating cavity 12, the accommodating groove 11 is in an open structure and is formed with a window on the outer peripheral surface of the outer casing 1, and the window cover plate 6 is detachably covered on the window to close the accommodating groove 11; the light source assembly 3 and the main control plate assembly 4 are respectively arranged at two axial ends of the air chamber cylinder 2, a light emitting end of the light source assembly 3 is communicated with the interior of the air chamber cylinder 2, a photoelectric detector 41 for receiving light energy is arranged on the main control plate assembly 4, and a receiving end of the photoelectric detector 41 is communicated with the interior of the air chamber cylinder 3; the air chamber barrel 2, the light source assembly 3 and the main control board assembly 4 form a whole detachable structure and are arranged in the containing groove 11, the battery 5 is arranged in the containing cavity 12, and one end of the battery is sealed through the end cover plate 7, so that the containing cavity 12 is formed.
In order to facilitate the installation of the outer casing 1, the carbon dioxide detecting device 100 further includes a mounting member 8.
In this embodiment, the mounting member 8 includes a mounting panel 81, and a threaded hole seat 82 disposed on the mounting panel 81, one end of the outer casing 1 is locked on the mounting panel 81 by screws, and the mounting member 8 is screwed into the threaded hole seat 82 and locked on the wall of the ventilation duct.
In another embodiment, the mounting member 8 includes a mounting panel 81, a receptacle 83 provided on the mounting panel 81, and the outer case 1 is mounted in a receptacle of the receptacle 83. The mounting member 8 is screwed to the ventilation duct.
One end of the outer shell 1 is of a closed structure, and the other end of the outer shell is sealed through an end cover plate 7.
An air chamber 21 is formed inside the air cell cylinder 2. The air chamber cylinder 2 is provided with an air inlet hole 22 and an air outlet hole 23 which are communicated with the air chamber 21. The air inlet hole 22 is disposed near the light source assembly 3, and the air outlet hole 23 is disposed near the photodetector 41. The outer shell 1 is provided with a first vent hole 13 corresponding to the position of the air inlet hole 22 or the air outlet hole 23, and the window cover plate 6 is provided with a second vent hole 61 corresponding to the position of the air inlet hole 22 or the air outlet hole 23.
The air inlet hole 22 is provided with a filtering membrane 10 for filtering the air entering the air chamber 21.
The inner wall surface of the air cavity 21 is coated with a layer of a metal material (not shown) having oxidation resistance. The metal material layer can be a gold plating layer, the gold plating layer has strong oxidation resistance and corrosion resistance, and meanwhile, the gold plating can enable the inner wall surface of the air cavity 21 to be smoother, so that the loss of illumination irradiating the inner wall surface of the air cavity 21 after reflection is smaller.
The light source assembly 3 includes a light source fixing plate 31, and an LED light source 32 disposed on the light source fixing plate 31. In this embodiment, the LED light source 32 is a narrow-band LED light source, the wavelength range of the light source is 0-5 μm, the center value of the peak wavelength is 4.26 μm, the power is less than 1mW, and the light source can work in a square wave mode or a pulse mode.
The centers of the LED light source 32 and the photoelectric detector 41 are positioned on the same straight line, and the straight line is parallel to or collinear with the axis of the air chamber cylinder 2, so that the light path is ensured to be linear, the loss caused by light reflection is reduced to the maximum extent, and meanwhile, as the gold plating layer is arranged on the inner wall surface of the air chamber 21, part of light rays reach the photoelectric detector 41 by means of the inner wall surface.
The main control panel assembly 4 is integrated with a microprocessor MCU, an LED light source driving module, a detector signal processing module, a communication module and a power circuit, wherein the microprocessor MCU is electrically connected with the LED light source driving module, the detector signal processing module, the communication module and the power circuit. The power supply circuit converts and stabilizes the voltage output by the battery 5 and then supplies power to the microprocessor MCU, the communication module, the LED light source driving module and the detector signal processing module.
The microprocessor MCU is internally provided with a flash memory, and temperature and humidity compensation function information is stored in the flash memory and comprises a calibration coefficient, a serial number and a temperature and humidity compensation function coefficient which are acquired by a temperature and humidity sensor. The temperature and humidity compensation function of the microprocessor MCU can be realized by acquiring sensor data in different temperature and humidity environments, applying a linear regression equation and multiple curve fitting to obtain the temperature and humidity compensation function, and realizing the temperature and humidity compensation function of the microprocessor MCU by realizing the compensation function through single chip microcomputer software and writing the compensation function into a flash memory.
A conducting member (not shown in the figure) for communicating the corresponding electrical connection points of the battery 5 and the main control board assembly 4 is arranged between the receiving groove 11 and the receiving cavity 12.
The photoelectric detector 41 is a photodiode detector which responds within the wavelength range of 0-5 mu m, and the wavelength region with the strongest signal response is about 4.2 mu m.
The LED light source driving module comprises a pulse generator, a pulse signal power driving amplifier and a singlechip pulse width adjusting generator which are driven by a singlechip, wherein the pulse generator generates a pulse signal by a timing module in the singlechip and outputs the pulse signal, the pulse period is 2000 mus, the positive pulse width is 20 mus, and the frequency is 1 kHz; the driving pulse width can be controlled by single chip microcomputer software; the pulse signal power driving amplifier is composed of a power triode. The LED light source driving module drives the light source component 3 to emit light through emitting pulse signals.
The detector signal processing module comprises a photocurrent voltage converter, a small signal amplifier and a filter. The photocurrent voltage converter is composed of an operational amplifier current voltage conversion circuit, the photoelectric detector 41 works in a photovoltaic mode, when infrared light irradiates a sensitive area of the detector, light energy is converted into a tiny current signal, namely a photovoltaic characteristic, the tiny current signal is amplified by the small signal amplifier, a signal filter circuit is used for filtering out direct current components and high-frequency noise in the signal, and finally the signal is converted into a voltage signal between 0V and 3V.
The communication module is a Lora communication module, supports the deep sleep mode of an idle state, can further reduce standby power consumption, and the total power consumption of the Lora communication module is less than 1W.
The communication module further comprises an antenna assembly 9. The antenna assembly 9 includes an antenna fixing base 91, and an antenna 92 disposed on the antenna fixing base 91 and in signal communication with the main control board assembly 4. In this embodiment, the antenna fixing base 91 is a suction cup type fixing base structure and is fixed on the ventilation duct by an adsorption manner. The antenna assembly 9 is a sucker antenna with a lead-out wire, the ISM frequency band comprises 433, 868, 915MH and the like, and the antenna is fixed on the metal ventilation pipeline in a sucker mode.
The window cover plate 6 and the outer shell 1 are detachably assembled through a buckle structure. A plurality of positioning portions (not marked in the figure) for positioning and fastening the air chamber cylinder 2, the light source assembly 3 and the main control panel assembly 4 are arranged in the accommodating groove 11.
The end cover 7 is assembled with the outer case 1 by screwing.
The outer casing 1 is integrally and radially mounted in the ventilation duct.
When the light source assembly 3 or the main control plate assembly 4 or the air chamber cylinder 2 breaks down and needs to be replaced, the mounting piece 8 carrying the outer shell 1 is integrally screwed off from the ventilation pipeline, then the window cover plate 6 is opened, the light source assembly 3, the main control plate assembly 4 and the air chamber cylinder 2 are exposed, and operations such as maintenance and replacement can be conveniently carried out on the air chamber cylinder 2; if the batteries need to be replaced, the end cover plate 7 is unscrewed, the batteries 5 are poured out, and the end cover plate 7 is screwed after the new batteries are replaced; after the parts are replaced, the mounting part 8 is directly carried with the whole body of the outer shell 1 and is tightly locked on the ventilation pipeline through screwing.
The carbon dioxide detecting apparatus 100 of the present embodiment deals with CO2Concentration detection is designed based on Lambert beer's law, since CO2Difference in concentration, CO2The absorption energy of infrared light with certain wavelength is different, and when the light passes through the light filled with CO2After the air chamber, the energy of the infrared light detected by the photoelectric detector is different, thereby generating different photovoltaic currents,the CO can be calculated by detecting the magnitude of the photovoltaic current2And (4) concentration.
The working principle of the small-volume air duct insertion type infrared carbon dioxide detection device 100 of the embodiment is as follows: the air in the ventilation pipeline enters the air cavity 21 from the air inlet 22 on the air chamber barrel 2 along the air flow direction, the LED light source driving module sends out pulses to excite the LED light source 32 to send out infrared light, the light energy of the air passing through the air in the air cavity 21 is absorbed and finally reaches the photoelectric detector 41 end, the photoelectric detector 41 detects light energy signals, the detector signal processing module converts the light energy signals into electric signals, the electric signals are transmitted to the microprocessor MCU, and the electric signals are wirelessly transmitted to an upper computer or a control center through the communication module, so that the concentration of carbon dioxide in the ventilation pipeline is measured.
The carbon dioxide detection device provided by the embodiment does not use an infrared sensor probe with digital output, so that one MCU is omitted, and the work of the MCU with digital output is finished by putting the MCU into a Lora communication MCU, thereby saving the cost of one MCU and reducing the volume of the sensor compared with the traditional air pipe type carbon dioxide sensor; the digital output infrared sensor probe comprises a PCB, an MCU, a light source drive circuit and a detector signal amplification processing circuit, and has larger volume and higher cost.
The carbon dioxide detection device provided by the embodiment omits a traditional air duct type carbon dioxide sensor shell, only keeps a cylindrical air duct detection probe, and has small integral volume of the sensor. The sensor places an LED light source, a photodiode detector, a PCB and a Lora communication MCU into a wind pipe detection carbon rod.
The carbon dioxide detection device that this embodiment provided adopts the low-power consumption Lora communication mode, compares 4-20mA or RS-485(Modbus agreement) communication interface that traditional tuber pipe formula carbon dioxide sensor adopted, and the low power dissipation has saved the wiring cost moreover, can use a section dry battery power supply.
The inserted infrared carbon dioxide detection device 100 of small volume tuber pipe of this embodiment's beneficial effect lies in:
1) the light source driving MCU, the detector signal processing MCU and the communication MCU in the traditional structure are integrated into a main control board, so that the installation cost and space of a circuit board are saved, and the overall size is greatly reduced;
2) the light source assembly, the main control panel assembly and the air chamber cylinder form an integral structure and are arranged in the cylindrical cylinder, so that the integral volume of the detection device is further reduced, the occupied space is greatly reduced, and the application range is expanded;
3) the mounting piece is arranged at the end part of the cylindrical shell, and is directly mounted in the ventilation pipe in a bolt mounting mode, so that the mounting and dismounting are convenient; the surface of the cylindrical barrel shell is provided with the window and the window cover plate, so that the light source assembly, the main control plate assembly and the air chamber barrel in the cylindrical barrel shell can be maintained and replaced conveniently, and the convenience of maintenance is provided;
4) meanwhile, a micro-power-consumption LED light source is adopted, low-power-consumption Lora communication is adopted, the power consumption of the whole machine is 3-5 mW, the power consumption of the sensor is greatly reduced, and the purpose of supplying power by using one dry battery is realized; the optical path of the sensor adopts a linear optical path, so that the optical wave energy loss formed by a plane or spherical reflection type optical path junction adopted by a common air duct type carbon dioxide sensor is avoided, and the resolution of the sensor can be obviously improved;
5) greatly reduces the manufacturing cost and improves the market competitiveness.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (10)
1. The utility model provides an infrared carbon dioxide detection device of small size tuber pipe bayonet which characterized in that: the solar cell comprises an outer shell, an air chamber cylinder, a light source component, a main control board component, a battery, a window cover board and an end cover board, wherein the outer shell is of a cylindrical structure, a containing groove and a containing cavity are formed in the outer shell, the containing groove is of an open structure, a window is formed in the outer peripheral surface of the outer shell, and the window cover board is detachably covered on the window to seal the containing groove; the main control board assembly is provided with a photoelectric detector, the light source assembly and the main control board assembly are respectively arranged at two ends of the air chamber cylinder, and a light emitting end of the light source assembly and a receiving end of the photoelectric detector are communicated with the inside of the air chamber cylinder; the air chamber barrel, the light source assembly and the main control board assembly are detachably arranged in the containing groove, the battery is arranged in the containing cavity, and one end of the battery is sealed through the end cover plate to form the containing cavity.
2. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 1, wherein: still include an installed part, the shell body passes through screw locking on the installed part, or alternate in the jack of installed part, the installed part passes through screw locking on ventilation pipe.
3. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 1, wherein: an air cavity is formed inside the air chamber cylinder; an air inlet hole and an air outlet hole which are communicated with the air cavity are formed in the air chamber cylinder; the air inlet hole is arranged close to the light source component, and the air outlet hole is arranged close to the photoelectric detector; the window cover plate is provided with a first air vent corresponding to the air inlet hole or the air outlet hole.
4. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 3, characterized in that: and the inner wall surface of the air cavity is coated with a gold plating layer.
5. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 1, wherein: the light source assembly comprises a light source fixing plate and an LED light source arranged on the light source fixing plate; the LED light source is a narrow-band LED light source, the wavelength range of the light source is 0-5 mu m, and the power is less than 1 mW.
6. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 5, wherein: the centers of the LED light source and the photoelectric detector are positioned on the same straight line, and the straight line is parallel or collinear with the axis of the air chamber cylinder.
7. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 1, wherein: the main control panel assembly is integrated with a microprocessor MCU, an LED light source driving module, a detector signal processing module, a communication module and a power circuit, and the microprocessor MCU is electrically connected with the LED light source driving module, the detector signal processing module, the communication module and the power circuit; the power supply circuit converts and stabilizes the voltage output by the battery and then supplies power to the microprocessor MCU, the communication module, the LED light source driving module and the detector signal processing module.
8. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 7, wherein: the LED light source driving module comprises a pulse generator, a pulse signal power driving amplifier and a singlechip pulse width adjusting generator;
the detector signal processing module comprises a photocurrent voltage converter, a small signal amplifier and a filter; the photoelectric current-voltage converter is composed of an operational amplifier current-voltage conversion circuit, the photoelectric detector converts light energy into a tiny current signal, the tiny current signal is amplified by the small signal amplifier, and then passes through the filter to filter out direct current components and high-frequency noise in the signal, and finally the signal is converted into a voltage signal.
9. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 7, wherein: the communication module is a Lora communication module.
10. The small-volume air duct insertion type infrared carbon dioxide detection device as claimed in claim 7, wherein: the communication module also comprises an antenna component; the antenna assembly is a sucker antenna with a leading-out wire and is fixed on the ventilation pipeline in a sucker mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120154880.3U CN215066145U (en) | 2021-01-20 | 2021-01-20 | Small-volume air pipe insertion type infrared carbon dioxide detection device |
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| CN202120154880.3U CN215066145U (en) | 2021-01-20 | 2021-01-20 | Small-volume air pipe insertion type infrared carbon dioxide detection device |
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| CN215066145U true CN215066145U (en) | 2021-12-07 |
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