Device for detecting concentration of formaldehyde in air based on laser technology

Abstract

The invention relates to the technical field of laser formaldehyde concentration detection devices, and discloses an air formaldehyde concentration detection device based on a laser technology. A trapping device composed of an assembly box, a rear end cover, a laser diode, a refractor, a photodiode, a first partition plate, a mounting frame, a reflector, a second partition plate, an air pump, a second guide pipe and an electromagnetic valve is arranged on the lower surface of the machine body. According to the invention, the trapping device is arranged, so that the equipment obtains the capability of accurately trapping and deeply analyzing external air, and in the operation process of the equipment, the trapping device continuously and efficiently collects an external air sample and rapidly carries out all-around component analysis on the external air sample; detection deviation caused by environmental interference, detection errors and other factors is effectively corrected in cooperation with analysis data, the accuracy degree of formaldehyde content detection of equipment is remarkably improved, and it is ensured that the detection result can truly and reliably reflect the formaldehyde content level in the actual environment.

Description

Technical Field

[0001] The present invention relates to the technical field of laser formaldehyde concentration detection devices, and specifically to a formaldehyde concentration detection device in air based on laser technology. Background Art

[0002] A laser formaldehyde concentration detection device is a cutting-edge device in the field of indoor environmental monitoring for accurately measuring the formaldehyde content in air, which is of great significance for ensuring human health. It uses laser as the light source and utilizes the absorption characteristics of formaldehyde molecules for laser with a specific wavelength to detect the concentration. The laser generator inside the device emits a laser beam with high stability and good monochromaticity. When the laser passes through an air sample containing formaldehyde, part of the laser is absorbed by formaldehyde molecules. By detecting the change in laser intensity with a high-precision photodetector and relying on the Lambert-Beer law, the built-in microprocessor accurately calculates the formaldehyde concentration value in the air.

[0003] Currently, the common laser formaldehyde concentration detection devices on the market have obvious drawbacks in the detection principle. When detecting the indoor formaldehyde content, such devices rely solely on a single laser detection method. However, the indoor environment is special, and the air flow is usually poor, resulting in the easy accumulation of various gases in a limited space. In such a complex gas environment, when the laser formaldehyde concentration detection device conducts detection work only by relying on the single means of laser, the detection process is extremely susceptible to interference from other gases. Since the detection device calculates the formaldehyde concentration based on the signal feedback by the laser, the interference from other gases will cause signal distortion, and finally there will be a certain error in the formaldehyde concentration value measured by the device. This error may lead to misjudgment of the actual formaldehyde content in the room. Therefore, we propose a formaldehyde concentration detection device in air based on laser technology. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides a formaldehyde concentration detection device in air based on laser technology, which solves the problems that when the existing laser formaldehyde concentration detection device conducts detection work only by relying on the single means of laser, the detection process is extremely susceptible to interference from other gases; since the detection device calculates the formaldehyde concentration based on the signal feedback by the laser, the interference from other gases will cause signal distortion, and finally there will be a certain error in the formaldehyde concentration value measured by the device, and this error may lead to misjudgment of the actual formaldehyde content in the room.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention is realized through the following technical solutions: An air formaldehyde concentration detection device based on laser technology, including a fuselage, an optical lens is installed at the lens interface of the fuselage, a display screen is installed inside the fuselage, control buttons are arranged on the rear surface of the fuselage, an assembly frame is fixedly connected to the upper surface of the fuselage, and a microprocessor is installed inside the fuselage;

[0008] A trapping device composed of an assembly box, a rear end cover, a laser diode, a refracting mirror, a photodiode, a partition one, a mounting frame, a reflecting mirror, a partition two, an air pump, a conduit two and a solenoid valve is arranged on the lower surface of the fuselage;

[0009] A heat dissipation device composed of a connecting pipe, a gas distribution pipe, a conduit, heat dissipation fins, a guiding box and a cover plate is arranged on the surface of the fuselage;

[0010] An exhaust device composed of an electric push rod, an adapter plate, a connecting rod, a pressing frame, a guiding frame, a sealing cover and a sealing gasket is arranged on the lower surface of the assembly box.

[0011] Preferably, the trapping device includes an assembly box, the assembly box is fixedly connected to the lower surface of the fuselage, a rear end cover is installed at the rear of the assembly box, a laser diode is fixedly connected to the inner wall of the rear end cover, a refracting mirror is fixedly connected to the inner wall of the assembly box near one end of the rear end cover, a photodiode is fixedly connected to the lower surface of the refracting mirror, a partition one is fixedly connected to the inner wall of the assembly box, a mounting frame is fixedly connected to the side surface of the partition one, and a reflecting mirror is fixedly connected to the inner wall of the mounting frame. The refracting mirror can send the laser source output by the laser diode into the gas storage space in the assembly box, so that the laser passes through the gas in the gas storage space.

[0012] Preferably, a limiting frame is fixedly connected to the inner wall of the assembly box, a support frame is inserted into the inner wall of the limiting frame, the support frame is installed inside the assembly box, a dust collection bag is fixedly connected to the inner wall of the support frame, the dust collection bag is located inside the assembly box, a partition two is fixedly connected to the inner wall of the assembly box, an air pump is fixedly connected to the side surface of the partition two, a conduit one is fixedly connected to the input end of the air pump, a solenoid valve is fixedly connected to the output end of the air pump, a conduit two is installed at the upper output end of the solenoid valve, and a protective grille is fixedly connected to the front end of the assembly box. By using the filtering effect of the dust collection bag, when the air pump pumps external gas, the dust in the external gas can be filtered to reduce the probability of dust entering the assembly box and causing pollution inside the assembly box.

[0013] Preferably, the heat dissipation device includes a connecting pipe, the connecting pipe is fixedly connected to the output end of the second conduit, the output end of the connecting pipe is fixedly connected with a gas distribution pipe, an air inlet hole is opened on the right side of the rear end cover, the output end of the gas distribution pipe is fixedly connected to the inner wall of the air inlet hole, and an exhaust hole is opened on the left side of the rear end cover;

[0014] A conduit is fixedly connected to the right side of the gas distribution pipe, a fixing frame is fixedly connected to the right side of the fuselage, the conduit is fixedly connected to the inner wall of the fixing frame, heat dissipation fins are installed on the inner wall of the fuselage, the heat dissipation fins penetrate through the upper surface of the fuselage, a guiding box is fixedly connected to the upper surface of the fuselage, the conduit is fixedly connected to the right surface of the guiding box, the upper end of the heat dissipation fins is located inside the guiding box, and a cover plate is fixedly connected to the upper surface of the guiding box. The gas distribution pipe can be used to send the gas sent by the connecting pipe into the conduit and the air inlet hole respectively, so that the pumped gas can dissipate heat from two areas.

[0015] Preferably, the exhaust device includes an electric push rod, the electric push rod is fixedly connected to the lower surface of the assembly box, the end of the telescopic rod of the electric push rod is fixedly connected with an adapter plate, a connecting rod is fixedly connected to the lower surface of the adapter plate, one end of the connecting rod away from the adapter plate is fixedly connected with a pressing frame, a guiding frame is fixedly connected to the lower surface of the assembly box, a sealing cover is slidably connected to the inner wall of the guiding frame, a sealing gasket is fixedly connected to the upper surface of the sealing cover, and the sealing gasket abuts against the lower surface of the assembly box. The guiding frame can be used to guide the moving direction of the sealing cover to ensure that the sealing cover opens along a specified direction after losing the restriction.

[0016] Preferably, the laser diode is electrically connected to the fuselage, the output end of the laser diode abuts against the side surface of the refracting mirror, the photodiode is electrically connected to the fuselage, and the photodiode abuts against the lower surface of the refracting mirror. The photodiode can cooperate with the built-in processor in the fuselage to analyze the received reflected light source to identify various gases in the trapped gas.

[0017] Preferably, a round hole is opened on the surface of the first partition plate, the lower output end of the solenoid valve is inserted into the inner wall of the round hole, the solenoid valve is electrically connected to the fuselage, and the lower output end of the solenoid valve is communicated with the inside of the mounting frame. The solenoid valve can be used to control the output direction of the gas pumped by the air pump under the control of the fuselage, so that the gas pumped by the air pump can be used for equipment heat dissipation.

[0018] Preferably, jacks are provided on the surface of the second partition board. The first conduit is fixedly connected to the inner wall of the jack. The first conduit is communicated with the inside of the air pump. The air pump is electrically connected to the fuselage. The second conduit penetrates through the right surface of the assembly box. The air pump can pump the external gas into the gas storage area formed by the collection box, so that when the device is used in different environments, the gas in different environments can be captured, and the fuselage can be used to analyze the gas in different environments in real time.

[0019] Preferably, the connecting pipe is communicated with the inside of the second conduit. The connecting pipe is communicated with the inside of the sub-air pipe. The sub-air pipe is communicated with the inside of the air inlet hole. The air inlet hole is communicated with the inside of the rear end cover. The exhaust hole is communicated with the inside of the rear end cover. The gas sent by the sub-air pipe can be injected into the sealed installation space of the rear end cover and the refractive mirror through the air inlet hole, so that the laser diode installed in the installation space can be cooled by the fluidity of the gas.

[0020] Preferably, the electric push rod is electrically connected to the fuselage. The connecting plate is in contact with the lower surface of the assembly box. The extrusion frame abuts against the lower surface of the sealing cover. A chamfer is provided at the front end of the extrusion frame. The expansion state of the sealing cover can be adjusted under the control of the electric push rod through the extrusion frame, so that the sealing cover can be opened or closed according to the needs of the user.

[0021] In summary, the technical effects and advantages of the present invention are as follows:

[0022] 1. In the present invention, by providing a capture device, the device obtains the ability to accurately capture and deeply analyze the external air. During the operation of the device, the capture device continuously and efficiently collects external air samples and quickly conducts a comprehensive component analysis on them. Relying on the obtained real-time data, the device can compare and analyze these data with the internal pre-stored standard data model and a large amount of detection data accumulated in the past in multiple dimensions and at a deep level, effectively correcting the detection deviation caused by factors such as environmental interference and detection errors, and significantly improving the accuracy of the device for detecting formaldehyde content, ensuring that the detection results can truly and reliably reflect the formaldehyde content level in the actual environment.

[0023] 2. In the present invention, by providing a heat dissipation device, when the device is working, the heat generated by the laser unit can be effectively suppressed, reducing the problem that the service life of the device is reduced due to overheating of the internal heat during long-term operation of the device, and further improving the heat control effect of the device during operation.

[0024] 3. In the present invention, by providing an exhaust device, the air in the capture device can be discharged to facilitate the subsequent use of the capture device. Description of the Drawings

[0025] Figure 1 Schematic diagram of the overall structure of a formaldehyde concentration detection device in air based on laser technology according to the present invention;

[0026] Figure 2 Rear view structure schematic diagram of a formaldehyde concentration detection device in air based on laser technology according to the present invention;

[0027] Figure 3 Front view of a formaldehyde concentration detection device in air based on laser technology according to the present invention;

[0028] Figure 4 Partial structure schematic diagram of a formaldehyde concentration detection device in air based on laser technology according to the present invention;

[0029] Figure 5 Schematic diagram of the structure of the trapping device of a formaldehyde concentration detection device in air based on laser technology according to the present invention;

[0030] Figure 6 For a formaldehyde concentration detection device in air based on laser technology according to the present invention Figure 5 Right view;

[0031] Figure 7 Internal structure schematic diagram of the trapping device of a formaldehyde concentration detection device in air based on laser technology according to the present invention;

[0032] Figure 8 Schematic diagram of the structure of the heat dissipation device of a formaldehyde concentration detection device in air based on laser technology according to the present invention;

[0033] Figure 9 Schematic diagram of the structure of the exhaust device of a formaldehyde concentration detection device in air based on laser technology according to the present invention.

[0034] In the figure: 1, fuselage; 2, optical lens; 3, display screen; 4, control button; 5, assembly frame;

[0035] 6, trapping device; 61, assembly box; 62, rear end cover; 63, laser diode; 64, refracting mirror; 65, photodiode; 66, partition one; 67, mounting frame; 68, reflecting mirror; 69, limiting frame; 610, support frame; 611, dust collection bag; 612, partition two; 613, air pump; 614, conduit one; 615, solenoid valve; 616, conduit two; 617, protective grille;

[0036] 7, heat dissipation device; 71, connecting pipe; 72, branch air pipe; 73, air inlet hole; 74, air outlet hole; 75, air guide pipe; 76, fixing frame; 77, heat dissipation fins; 78, guiding box; 79, cover plate;

[0037] 8. Exhaust device; 81. Electric push rod; 82. Connecting plate; 83. Connecting rod; 84. Extrusion frame; 85. Guide frame; 86. Sealing cover; 87. Sealing gasket. Detailed implementation manner

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Refer to Figures 1-9 A formaldehyde concentration detection device in the air based on laser technology as shown, body 1, an optical lens 2 is installed at the lens interface of body 1, a display screen 3 is installed inside body 1, control buttons 4 are arranged on the rear surface of body 1, an assembly frame 5 is fixedly connected to the upper surface of body 1, and a microprocessor is installed inside the body 1;

[0040] A capture device 6 composed of an assembly box 61, a rear end cover 62, a laser diode 63, a refracting mirror 64, a photodiode 65, a partition plate 66, a mounting frame 67, a reflecting mirror 68, a partition plate 612, an air pump 613, a conduit 616 and a solenoid valve 615 is arranged on the lower surface of the body 1;

[0041] A heat dissipation device 7 composed of a connecting pipe 71, a branch air pipe 72, a guide air pipe 75, heat dissipation fins 77, a guide box 78 and a cover plate 79 is arranged on the surface of the body 1;

[0042] An exhaust device 8 composed of an electric push rod 81, a connecting plate 82, a connecting rod 83, an extrusion frame 84, a guide frame 85, a sealing cover 86 and a sealing gasket 87 is arranged on the lower surface of the assembly box 61.

[0043] Among them, the capture device 6 includes an assembly box 61, the assembly box 61 is fixedly connected to the lower surface of the body 1, a rear end cover 62 is installed at the rear of the assembly box 61, a laser diode 63 is fixedly connected to the inner wall of the rear end cover 62, a refracting mirror 64 is fixedly connected to the inner wall of the assembly box 61 near one end of the rear end cover 62, a photodiode 65 is fixedly connected to the lower surface of the refracting mirror 64, a partition plate 66 is fixedly connected to the inner wall of the assembly box 61, a mounting frame 67 is fixedly connected to the side surface of the partition plate 66, and a reflecting mirror 68 is fixedly connected to the inner wall of the mounting frame 67. The laser source output by the laser diode 63 can be sent into the gas storage space in the assembly box 61 by using the refracting mirror 64, so that the laser passes through the gas in the gas storage space.

[0044] Among them, a limiting frame 69 is fixedly connected to the inner wall of the assembly box 61. A support frame 610 is inserted into the inner wall of the limiting frame 69. The support frame 610 is installed inside the assembly box 61. A dust collection bag 611 is fixedly connected to the inner wall of the support frame 610. The dust collection bag 611 is located inside the assembly box 61. A second partition 612 is fixedly connected to the inner wall of the assembly box 61. An air pump 613 is fixedly connected to the side surface of the second partition 612. A first conduit 614 is fixedly connected to the input end of the air pump 613. A solenoid valve 615 is fixedly connected to the output end of the air pump 613. A second conduit 616 is installed at the upper output end of the solenoid valve 615. A protective grille 617 is fixedly connected to the front end of the assembly box 61. By using the filtering effect of the dust collection bag 611, when the air pump 613 pumps in external air, the dust in the external air can be filtered to reduce the probability of dust entering the assembly box 61 and contaminating the inside of the assembly box 61.

[0045] Among them, the heat dissipation device 7 includes a connecting pipe 71. The connecting pipe 71 is fixedly connected to the output end of the second conduit 616. A gas distribution pipe 72 is fixedly connected to the output end of the connecting pipe 71. An air inlet hole 73 is opened on the right side of the rear end cover 62. The output end of the gas distribution pipe 72 is fixedly connected to the inner wall of the air inlet hole 73. An exhaust hole 74 is opened on the left side of the rear end cover 62.

[0046] A guide pipe 75 is fixedly connected to the right side of the gas distribution pipe 72. A fixing frame 76 is fixedly connected to the right side of the fuselage 1. The guide pipe 75 is fixedly connected to the inner wall of the fixing frame 76. Heat dissipation fins 77 are installed inside the fuselage 1. The heat dissipation fins 77 penetrate through the upper surface of the fuselage 1. A guiding box 78 is fixedly connected to the upper surface of the fuselage 1. The guide pipe 75 is fixedly connected to the right side surface of the guiding box 78. The upper ends of the heat dissipation fins 77 are located inside the guiding box 78. A cover plate 79 is fixedly connected to the upper surface of the guiding box 78. By using the gas distribution pipe 72, the gas sent into the connecting pipe 71 can be respectively sent into the guide pipe 75 and the air inlet hole 73, so that the pumped gas can dissipate heat in two areas.

[0047] Among them, the exhaust device 8 includes an electric push rod 81. The electric push rod 81 is fixedly connected to the lower surface of the assembly box 61. The end of the telescopic rod of the electric push rod 81 is fixedly connected to an adapter plate 82. A connecting rod 83 is fixedly connected to the lower surface of the adapter plate 82. One end of the connecting rod 83 far from the adapter plate 82 is fixedly connected to a pressing frame 84. A guiding frame 85 is fixedly connected to the lower surface of the assembly box 61. A sealing cover 86 is slidably connected to the inner wall of the guiding frame 85. A sealing gasket 87 is fixedly connected to the upper surface of the sealing cover 86. The sealing gasket 87 abuts against the lower surface of the assembly box 61. By using the guiding frame 85, the moving direction of the sealing cover 86 can be guided to ensure that the sealing cover 86 opens along a specified direction after losing its restriction.

[0048] Among them, the laser diode 63 is electrically connected to the fuselage 1, the output end of the laser diode 63 is in contact with the side surface of the refractor 64, the photodiode 65 is electrically connected to the fuselage 1, and the photodiode 65 is in contact with the lower surface of the refractor 64. The photodiode 65 can be used in conjunction with the built-in processor in the fuselage 1 to analyze the received reflected light source to identify various gases in the captured gas.

[0049] Among them, a circular hole is opened on the surface of the partition 66, the lower output end of the solenoid valve 615 is plugged into the inner wall of the circular hole, the solenoid valve 615 is electrically connected to the fuselage 1, and the lower output end of the solenoid valve 615 is connected to the interior of the mounting bracket 67. The solenoid valve 615 can be used to control the output direction of the gas pumped by the air pump 613 under the control of the fuselage 1, so that the gas pumped by the air pump 613 can be used for equipment heat dissipation.

[0050] Among them, a socket is opened on the surface of the second partition 612, and the first conduit 614 is fixedly connected to the inner wall of the socket. The first conduit 614 is connected to the inside of the air pump 613, and the air pump 613 is electrically connected to the fuselage 1. The second conduit 616 passes through the right side surface of the assembly box 61. The air pump 613 can be used to pump external gas into the gas storage area formed by the collection box, so that when the equipment is used in different environments, it can capture the gas in different environments and cooperate with the fuselage 1 to perform real-time analysis of the gas in different environments.

[0051] Among them, the connecting pipe 71 is connected to the interior of the second conduit 616, the connecting pipe 71 is connected to the interior of the gas distribution pipe 72, the gas distribution pipe 72 is connected to the interior of the air inlet hole 73, the air inlet hole 73 is connected to the interior of the rear end cover 62, and the exhaust hole 74 is connected to the interior of the rear end cover 62. The gas delivered by the gas distribution pipe 72 can be injected into the enclosed installation space of the rear end cover 62 and the refraction mirror 64 through the air inlet hole 73, so that the fluidity of the gas can be used to dissipate heat for the laser diode 63 installed in the installation space.

[0052] Among them, the electric push rod 81 is electrically connected to the fuselage 1, the connecting plate 82 is in contact with the lower surface of the assembly box 61, the extrusion frame 84 is in contact with the lower surface of the sealing cover 86, and the front end of the extrusion frame 84 is provided with a chamfer. Through the extrusion frame 84, the expansion state of the sealing cover 86 can be adjusted under the control of the electric push rod 81, so that the sealing cover 86 can be opened or closed according to user needs.

[0053] Working principle of the present invention: When using the device, place the device in the environment to be detected, turn on the switch of the fuselage 1, the fuselage 1 is powered on and works, and outputs the laser into the detection environment through the built-in laser emission unit and the optical lens 2. After the laser is output into the detection environment, the photodetector in the fuselage 1 detects the intensity change of the laser, and uses the Lambert-Beer law to calculate the concentration of formaldehyde in the air with the help of the built-in microprocessor;

[0054] Before detection, the user can turn on the switch of the air pump 613. The air pump 613 is powered on and works, and pumps the external gas into the solenoid valve 615 from the direction of the protective grille 617 in cooperation with the first conduit 614. When the air pump 613 extracts gas, the gas enters the air pump 613 through the protective grille 617 and the dust collection bag 611. When the gas passes through the dust collection bag 611, the dust collection bag 611 filters the dust mixed inside itself. The filtered gas is pumped into the solenoid valve 615 through the air pump 613. The solenoid valve 615 sends the gas into the gas storage area of the assembly box 61 and the second conduit 616 respectively through the output ports on the upper and lower sides. After the solenoid valve 615 works for 1 min ± 10 s, the fuselage 1 controls the solenoid valve 615 to close the lower output port, and the gas can only be sent into the second conduit 616 through the upper output port;

[0055] After the gas storage area is filled with external gas, turn on the switches of the laser diode 63 and the photoelectric sensor through the button on the fuselage 1. The laser diode 63 is powered on and works, and outputs the laser into the gas in the gas storage area in cooperation with the refraction mirror 64. After the laser passes through the gas storage area, the laser is sent back to the refraction mirror 64 through the reflection of the reflection mirror 68. The refraction mirror 64 sends the returned laser into the photodiode 65. The photodiode 65 cooperates with the microprocessor in the fuselage 1 to analyze the laser band reflected back, so as to obtain the real-time air data in the external environment. After obtaining the data in the external environment, the fuselage 1 can compare the external air data collected by its own laser with the air data obtained by the capture device 6 through the microprocessor, so as to analyze the formaldehyde content in the external air. By setting the capture device 6, the device obtains the ability to accurately capture and deeply analyze the external air. During the operation of the device, the capture device 6 continuously and efficiently collects external air samples and quickly conducts a comprehensive component analysis on them; relying on the obtained real-time data, the device can compare and analyze these data with the internal pre-stored standard data model and a large number of detection data accumulated in the past in multiple dimensions and at a deep level, effectively correcting the detection deviation caused by factors such as environmental interference and detection error, significantly improving the accuracy of the device for detecting formaldehyde content, and ensuring that the detection result can truly and reliably reflect the formaldehyde content level in the actual environment;

[0056] After the gas is sent into the second conduit 616, the gas enters the connecting pipe 71 through the second conduit 616. The connecting pipe 71 sends the gas into the gas distribution pipe 72. The gas distribution pipe 72 sends the gas into the air inlet hole 73 and the air guide pipe 75 respectively. The gas enters the installation area of the rear end cover 62 through the air inlet hole 73, and cooperates with the exhaust hole 74 to dissipate heat from the laser diode 63 located in the installation area. The gas entering the air guide pipe 75 enters the guiding box 78, and cooperates with the heat dissipation fins 77 to dissipate heat from the heat generated by the laser unit in the fuselage 1. By setting the heat dissipation device 7, when the device is working, the heat generated by the laser unit can be effectively suppressed, reducing the problem that the internal heat of the device overheats due to long-term operation of the device, resulting in a reduction in the service life of the device, and further improving the heat control effect of the device during operation;

[0057] In addition, when the detection is completed and the gas in the assembly box 61 needs to be discharged, the switch of the electric push rod 81 is turned on. The electric push rod 81 is energized to work and pushes the connecting plate 82. The connecting plate 82 cooperates with the connecting rod 83 to push the extrusion frame 84. During the movement of the extrusion frame 84, it leaves below the sealing cover 86. The sealing cover 86 loses the restriction of the extrusion frame 84 and moves downward along the guiding direction of the guiding frame 85 under the action of its own weight. When the sealing cover 86 is opened, the gas can be discharged through the hole below the assembly box 61. By setting the exhaust device 8, the air in the trapping device 6 can be discharged to facilitate the subsequent use of the trapping device 6.

[0058] All the electrical components mentioned in this article are connected to the external main controller and 220V mains. And the main controller can be a conventional known device such as a computer for control. At the same time, the analysis methods used in this solution can all adopt the existing conventional gas analysis methods.

[0059] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An air formaldehyde concentration detection device based on laser technology, including a fuselage (1), characterized in that: An optical lens (2) is installed at the lens interface of the fuselage (1). A display screen (3) is installed inside the fuselage (1). Control buttons (4) are arranged on the rear surface of the fuselage (1). An assembly frame (5) is fixedly connected to the upper surface of the fuselage (1). A trapping device (6) composed of an assembly box (61), a rear end cover (62), a laser diode (63), a refracting mirror (64), a photodiode (65), a partition one (66), a mounting bracket (67), a reflecting mirror (68), a partition two (612), an air pump (613), a conduit two (616) and a solenoid valve (615) is arranged on the lower surface of the fuselage (1). A heat dissipation device (7) composed of a connecting pipe (71), a sub-air pipe (72), a guide air pipe (75), heat dissipation fins (77), a guiding box (78) and a cover plate (79) is arranged on the surface of the fuselage (1). An exhaust device (8) composed of an electric push rod (81), an adapter plate (82), a connecting rod (83), a pressing frame (84), a guiding frame (85), a sealing cover (86) and a sealing gasket (87) is arranged on the lower surface of the assembly box (61).

2. The air formaldehyde concentration detection device based on laser technology according to claim 1, characterized in that: The trapping device (6) includes an assembly box (61). The assembly box (61) is fixedly connected to the lower surface of the fuselage (1). A rear end cover (62) is installed at the rear side of the assembly box (61). A laser diode (63) is fixedly connected to the inner wall of the rear end cover (62). A refracting mirror (64) is fixedly connected to the inner wall of the assembly box (61) near one end of the rear end cover (62). A photodiode (65) is fixedly connected to the lower surface of the refracting mirror (64). A partition one (66) is fixedly connected to the inner wall of the assembly box (61). A mounting bracket (67) is fixedly connected to the side surface of the partition one (66). A reflecting mirror (68) is fixedly connected to the inner wall of the mounting bracket (67).

3. The air formaldehyde concentration detection device based on laser technology according to claim 1, wherein: A limiting frame (69) is fixedly connected to the inner wall of the assembly box (61). A support frame (610) is inserted into the inner wall of the limiting frame (69). The support frame (610) is installed inside the assembly box (61). A dust collection bag (611) is fixedly connected to the inner wall of the support frame (610). The dust collection bag (611) is located inside the assembly box (61). A partition two (612) is fixedly connected to the inner wall of the assembly box (61). An air pump (613) is fixedly connected to the side surface of the partition two (612). A conduit one (614) is fixedly connected to the input end of the air pump (613). A solenoid valve (615) is fixedly connected to the output end of the air pump (613). A conduit two (616) is installed at the upper output end of the solenoid valve (615). A protective grille (617) is fixedly connected to the front end of the assembly box (61).

4. A formaldehyde concentration detection device in air based on laser technology according to claim 1, characterized in that: The heat dissipation device (7) includes a connecting pipe (71), the connecting pipe (71) is fixedly connected to the output end of the second conduit (616), the output end of the connecting pipe (71) is fixedly connected to a gas distribution pipe (72), an air inlet hole (73) is formed on the right side of the rear end cover (62), the output end of the gas distribution pipe (72) is fixedly connected to the inner wall of the air inlet hole (73), and an exhaust hole (74) is formed on the left side of the rear end cover (62). A conduit (75) is fixedly connected to the right side of the gas distribution pipe (72), a fixing frame (76) is fixedly connected to the right side of the fuselage (1), the conduit (75) is fixedly connected to the inner wall of the fixing frame (76), heat dissipation fins (77) are installed on the inner wall of the fuselage (1), the heat dissipation fins (77) penetrate through the upper surface of the fuselage (1), a guiding box (78) is fixedly connected to the upper surface of the fuselage (1), the conduit (75) is fixedly connected to the right side surface of the guiding box (78), the upper end of the heat dissipation fins (77) is located inside the guiding box (78), and a cover plate (79) is fixedly connected to the upper surface of the guiding box (78).

5. The air formaldehyde concentration detection device based on laser technology according to claim 1, characterized in that: The exhaust device (8) includes an electric push rod (81), the electric push rod (81) is fixedly connected to the lower surface of the assembly box (61), the end of the telescopic rod of the electric push rod (81) is fixedly connected to an adapter plate (82), a connecting rod (83) is fixedly connected to the lower surface of the adapter plate (82), an extrusion frame (84) is fixedly connected to the end of the connecting rod (83) away from the adapter plate (82), a guiding frame (85) is fixedly connected to the lower surface of the assembly box (61), a sealing cover (86) is slidably connected to the inner wall of the guiding frame (85), a sealing gasket (87) is fixedly connected to the upper surface of the sealing cover (86), and the sealing gasket (87) abuts against the lower surface of the assembly box (61).

6. The air formaldehyde concentration detection device based on laser technology according to claim 1, wherein: The laser diode (63) is electrically connected to the fuselage (1), the output end of the laser diode (63) abuts against the side surface of the refractive mirror (64), the photodiode (65) is electrically connected to the fuselage (1), and the photodiode (65) abuts against the lower surface of the refractive mirror (64).

7. A formaldehyde concentration detection device in air based on laser technology according to claim 1 or 3, characterized in that: A round hole is formed on the surface of the first partition plate (66), the lower output end of the solenoid valve (615) is inserted into the inner wall of the round hole, the solenoid valve (615) is electrically connected to the fuselage (1), and the lower output end of the solenoid valve (615) is communicated with the inside of the mounting bracket (67).

8. The formaldehyde concentration detection device in the air based on laser technology according to claim 1 or 3, characterized in that: A jack is formed on the surface of the second partition plate (612), the first conduit (614) is fixedly connected to the inner wall of the jack, the first conduit (614) is communicated with the inside of the air pump (613), the air pump (613) is electrically connected to the fuselage (1), and the second conduit (616) penetrates through the right side surface of the assembly box (61).

9. The air formaldehyde concentration detection device based on laser technology according to claim 1 or 4, characterized in that: The connecting pipe (71) is internally connected to the second conduit (616), the connecting pipe (71) is internally connected to the gas distribution pipe (72), the gas distribution pipe (72) is internally connected to the air inlet hole (73), the air inlet hole (73) is internally connected to the rear end cover (62), and the exhaust hole (74) is internally connected to the rear end cover (62).

10. The formaldehyde concentration detection device in air based on laser technology according to claim 1 or 5, characterized in that: The electric push rod (81) is electrically connected to the fuselage (1), the connecting plate (82) is in contact with the lower surface of the assembly box (61), the extrusion frame (84) abuts against the lower surface of the sealing cover (86), and a chamfer is provided at the front end of the extrusion frame (84).

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