CN216484590U - Portable gas detector - Google Patents

Abstract

The utility model discloses a portable gas detector, which comprises a shell, a substrate, a laser arranged on one side of the substrate, an air chamber device and a laser detector, wherein the air chamber device comprises a light inlet and a light outlet, the laser emitted by the laser enters the air chamber device from the light inlet, the air chamber device comprises a first reflector and a second reflector which are arranged relatively and used for refracting the laser, and the refracted laser is emitted into the laser detector from the light outlet; the portable gas detector also comprises a first total reflector and a second total reflector, wherein the first total reflector is used for adjusting the angle of the laser entering the gas chamber device, and the second total reflector is used for adjusting the angle of the laser entering the laser detector. Compared with the prior art, the retroreflective lens assembly saves the complex retroreflective lens assembly in the prior art, reduces the difficulty of light path adjustment and reduces the cost; meanwhile, the sensitivity of the method for detecting gases with low concentration and low quantity is remarkably improved.

Description

Portable gas detector

Technical Field

The utility model relates to a gaseous check out test set field, in particular to portable gaseous detector.

Background

In recent years, air pollution is more and more serious, people pay more attention to air safety, under the condition, air quality detection becomes more important, along with the development and maturity of a photoelectric monitoring technology and a spectral analysis technology, gas detection equipment applying the principle also appears endlessly, gas detection equipment in the prior art generally comprises a QCL laser, a middle infrared laser detector, a retro-reflector and a gas to be detected, the QCL laser is used for emitting wide-spectrum middle infrared laser, the gas to be detected is needed to be punctured by laser, different gases can absorb middle infrared laser with corresponding frequency, the middle infrared laser absorbing corresponding frequency enters a middle infrared laser detector through a plurality of groups of complex retro-reflectors or other methods for signal processing and analysis, by comparing the substance samples in the library, the absorption spectrum can be analyzed to detect various corresponding substances.

However, in the prior art, the angle of the light path is inconvenient to adjust, and meanwhile, the path of the laser in the gas chamber device is short, so that the sensitivity of the laser in the detection of gases with low concentration and low quantity is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a portable gas detector has solved the inconvenient technical problem of portable gas detector light path adjustment among the prior art.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts as follows: a portable gas detector, comprising: a housing; a substrate disposed within the housing; install laser instrument, air chamber device and laser detector on one side of the base plate, just the air chamber device is including advancing light entrance and light-emitting window, the laser that the laser instrument sent is followed it enters into to advance the light entrance among the air chamber device, including setting up first reflector and the second reflector that is used for refracting laser in its length direction both sides relatively in the air chamber device, through refracted laser by the light-emitting window jets into laser detector.

Furthermore, the portable gas detector further comprises a first total reflector and a second total reflector which are arranged on the substrate, wherein the first total reflector is arranged at the light inlet of the gas chamber device and is opposite to the laser for adjusting the angle of the laser entering the gas chamber device, and the second total reflector is arranged at the light outlet of the gas chamber device and is opposite to the laser detector for adjusting the angle of the laser entering the laser detector.

Further, a beam splitter component is arranged between the laser detector and the second total reflection mirror.

Furthermore, a first mounting opening is formed in the substrate, the laser is arranged opposite to the first mounting opening, and a cooling fan is arranged on one side, opposite to the laser, of the first mounting opening.

Further, the air chamber device still is equipped with air inlet and gas vent, be equipped with on the base plate with the relative excessive mouth of gas vent, portable gas detection appearance still includes: the sealing ring is arranged between the exhaust port and the overflowing port in a cushioning mode; the exhaust guide nozzle is arranged on one side of the base plate opposite to the air chamber device and is detachably installed in the flow passing port; and the air pipe joint is matched with the exhaust guide nozzle.

Further, the housing includes: the first cover body and the second cover body are respectively arranged on two sides of the surface of the substrate to oppositely clamp and package the substrate, and the handle is arranged at the end part of the substrate.

Further, the first cover body comprises a first frame arranged on one side of the substrate, and a first cover plate arranged on the opposite side of the first frame and the substrate; the second cover body comprises a second frame arranged on the other side of the substrate, and a second cover plate arranged on the opposite side of the second frame and the substrate in a covering mode.

Further, portable gas detector still including install main control board, signal board, collection board and the power strip on the base plate.

Further, portable gas detection appearance still includes the light path of laser instrument or the light path is outer to be set up movably ground from examining the piece, just laser detector and gallery data connection, contain laser in the gallery and pass through the spectrogram of piece from examining, the piece from examining of locating in the light path is used for detecting whether gas detection appearance is normal.

Further, portable gas detector still includes plectrum, drive arrangement and spacing subassembly, the one end installation of plectrum the piece is examined certainly, just the other end of plectrum with drive arrangement connects, drive arrangement drives the plectrum rotates, spacing subassembly keeps off and establishes the both sides of plectrum rotation direction are in order to restrict the turned angle of plectrum.

Has the advantages that: compared with the prior art, the laser, the air chamber device and the laser detector are uniformly arranged on the substrate, laser emitted by the laser enters the air chamber device, the laser is refracted in the air chamber device, and the angle of the laser emitted from the air chamber device can be adjusted by adjusting the incident angle of the laser, so that a complex retro-reflective mirror assembly in the prior art is saved, the integration degree of a light path assembly is high, the adjustment difficulty is reduced, light path devices are reduced, and the cost is reduced; meanwhile, the arrangement of the air chamber device prolongs the path of laser passing through the air chamber device, and the sensitivity of the laser in detection of gases with low concentration and low mass is remarkably improved.

Drawings

Fig. 1 is a structural diagram of the portable gas detector at the viewing angle of the first cover of the present invention.

Fig. 2 is a view showing an internal structure of the portable gas detector shown in fig. 1, with a view angle of the first cover omitted.

Fig. 3 is a structural diagram of the portable gas detector at the viewing angle of the second cover of the present invention.

Fig. 4 is an internal structure view of the portable gas detector shown in fig. 3, with the view angle of the second cover omitted.

Fig. 5 is an explosion structure diagram of the portable gas detector of the present invention.

Fig. 6 is a perspective view of the middle air chamber device of the present invention.

Fig. 7 is a schematic perspective view of another view angle of the middle air chamber device according to the present invention.

Fig. 8 is a schematic view of the explosion structure of the middle air chamber device of the present invention.

Fig. 9 is a sectional structure view of the middle air chamber device of the present invention.

Wherein, the utility model provides a main reference numeral is:

10. a housing; 101. a first cover body; 1011. a first frame; 1012. a first cover plate; 1013. a first base plate; 1014. a first cavity; 102. a second cover body; 1021. a second frame; 1022. a second cover plate; 1023. a second base plate; 1024. a second cavity; 103. a handle; 104. an air outlet; 105. an air inlet; 106. heat dissipation holes; 20. a substrate; 201. a first mounting port; 202. a second mounting opening; 203. an overflow channel; 301. a main control board; 302. a signal plate; 303. collecting a plate; 304. a power panel; 401. self-checking the film; 402. a fixed block; 403. a shifting sheet; 404. a drive device; 405. a limiting component; 50. a laser; 100. an air chamber device; 60. a laser detector; 70. a heat radiation fan; 501. a first total reflection mirror; 502. a second total reflection mirror; 503. a beam splitter assembly; 80. a seal ring; 801. an exhaust guide nozzle; 1. a sealing cover; 2. a first reflective mirror; 3. a second reflective mirror; 4. a zinc selenide lens window sheet; 5. a gas chamber main body; 51. a gas chamber cavity; 52. a light inlet; 53. a light outlet; 54. an air inlet; 55. an opening; 56. a first side wall; 57. a second side wall; 58. a fourth side wall; 59. an exhaust port; 6. a second fixing plate; 7. a first gas pipe joint; 71. a first hose; 8. a second air pipe joint; 81. a second hose; 9. mounting a bracket; 91. a wind control device; 92. a first fixing plate.

Detailed Description

It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The utility model provides a portable gas detector, as shown in figures 1 to 5, this portable gas detector major composition structure is including casing 10, base plate 20, still including installing light path subassembly, self-checking subassembly and the circuit control subassembly on base plate 20, carries out the detail to portable gas detector below.

Referring to fig. 5, the substrate 20 is mainly a rectangular plate structure, and is disposed in the middle of the casing 10, and the light path component, the self-checking component and the circuit control component are mounted on two sides of the substrate 20; the housing 10 is mainly composed of two parts, namely a first cover 101 and a second cover 102, the first cover 101 and the second cover 102 are oppositely arranged, and the opposite sides of the first cover 101 and the second cover 102 are both provided with openings 55, the substrate 20 is arranged between the first cover 101 and the second cover 102, the substrate 20 is clamped in the middle by the first cover 101 and the second cover 102, and the first cover 101 and the second cover 102 respectively form a cavity capable of accommodating each component, so that each functional component (a light path component, a self-test component and a circuit control component) on the substrate 20 can be encapsulated and protected by the two covers, and the handle 103 and the substrate 20 are fixed by screws, thus the structural design greatly improves the installation convenience of the gas detector, facilitates the disassembly and replacement of the components inside the detector, and the upper end of the substrate 20 is provided with the handle 103, is convenient for carrying.

More specifically, the first cover 101 includes a first frame 1011 and a first cover plate 1012, the first frame 1011 is configured as a rectangular frame structure, the size of the first frame 1011 is consistent with the size of the substrate 20, and the main parameters that need to ensure the size consistency include length and width, so as to ensure the flatness of the external dimensions of the detector, and the first frame 1011 and the substrate 20 are fixed together by a plurality of screws; the first cover plate 1012 and the first edge frame 1011 are detachably mounted, the first cover plate 1012 is a plate body, after the first edge frame 1011 is mounted on the substrate 20, the first cover plate 1012 is mounted on the first edge frame 1011 through screws, and a switch and an interface (a power supply interface, a signal interface and the like) are arranged on the first edge frame 1011, so that the optical path assembly, the self-checking assembly, the circuit control assembly and the like can conveniently perform data transmission and other operations with the outside.

In one embodiment, the first frame 1011 is a split frame, which is composed of two parts, namely a first bottom plate 1013 disposed at the bottom of the testing apparatus and an inverted "concave" frame combined with the first bottom plate 1013 to form a frame, so that the self-testing assembly is mounted on the first bottom plate 1013, and is fixed on the first bottom plate 1013 and the substrate 20, and is stably fixed inside the testing apparatus.

More specifically, the second cover 102 includes a second frame 1021 and a second cover 1022, the second frame 1021 and the substrate 20 are fixed together by a plurality of screws, the second frame 1021 is configured as a rectangular frame structure, the size of the second frame 1021 is consistent with the size of the substrate 20, and the main parameters that need to ensure the consistency of the sizes include length and width, so as to ensure the flatness of the external dimensions of the detector; the second cover 1022 and the second frame 1021 are fixed together by a plurality of screws, and in this embodiment, the switch and the interface (power interface, signal interface, etc.) may also be disposed on the second frame 1021.

Similarly, in an embodiment, the second frame 1021 may also be a split structure, that is, the second frame 1021 is also split into two parts, one part is the second bottom plate located at the lowest end of the detector, and the other part is a frame structure in the shape of the inverted "concave" similarly.

The optical path component is installed on one side of the substrate 20, and mainly comprises a laser 50, a gas chamber device 100 and a laser detector 60; the laser 50 comprises a fixing plate and an emitting head arranged on the fixing plate, a first mounting opening 201 is formed in the substrate 20, the fixing plate of the laser 50 is aligned with the first mounting opening 201, the fixing plate and the periphery of the first mounting opening 201 are fixed together through screws, the emitting head is positioned on one side of the fixing plate opposite to the first mounting opening 201, a cooling fan 70 is further arranged on one side of the fixing plate opposite to the first mounting opening 201, and the cooling fan 70 is positioned in the first mounting opening 201 and used for cooling the laser 50; the air chamber device 100 is installed on one side of the laser 50 of the substrate 20, the air chamber device 100 has a length, in a conventional state, the air chamber device 100 is horizontally placed, one side of the air chamber device 100 in the length direction is provided with a light inlet 52 and a light outlet 53, the laser detector 60 is opposite to the light outlet 53 of the air chamber device 100, laser emitted by the laser 50 enters the air chamber device 100 from the light inlet 52, the laser is refracted for multiple times in the air chamber device 100, the refracted laser enters the laser detector 60 from the light outlet 53, the laser detector 60 analyzes the laser to obtain a corresponding map, and substances contained in the air chamber can be determined by comparing the obtained map with the map in the map library.

According to the laser device, the laser 50, the air chamber device 100 and the laser detector 60 are uniformly arranged on the substrate 20, laser emitted by the laser 50 enters the air chamber device 100, the laser is refracted in the air chamber device 100, and the angle of the laser emitted from the air chamber device 100 can be adjusted by adjusting the incident angle of the laser 50, so that a complex retro-reflecting mirror assembly in the prior art is saved, the integration degree of a light path assembly is high, the adjustment difficulty is reduced, light path devices are reduced, and the cost is reduced; meanwhile, the arrangement of the gas chamber device 100 prolongs the path of laser passing through the gas chamber device 100, and the sensitivity of the laser in detection of gases with low concentration and low quantity is obviously improved.

Specifically, as shown in fig. 6 to 9, the air chamber device includes an air chamber main body 5, an air chamber cavity 51 is formed inside the air chamber main body 5, an air control device 91 capable of adjusting the air speed and collecting the air is disposed on the air chamber main body 5, an air inlet of the air control device 91 is communicated with the air chamber cavity 51, an air outlet is communicated with the external environment of the air chamber main body 5, and an air inlet 54 communicated with the air chamber cavity 51 is formed on the air chamber main body 5. The air chamber body 5 is provided with a light inlet 52 for guiding incident light and a light outlet 53 for guiding reflected light at positions close to the two ends, the light inlet 52 and the light outlet 53 are respectively arranged on two opposite side walls of the air chamber body 5, and the air chamber cavity 51 is internally provided with a first reflective mirror 2 and a second reflective mirror 3 which are oppositely arranged.

When the utility model discloses when applying to quantum cascade laser instrument and carrying out gaseous detection, utilize the gas that air inlet 54 butt joint needs to detect, utilize wind-operated device 91 will wait to detect that gaseous extraction enters air chamber cavity 51 and derives from its self gas vent, let air chamber cavity 51 be full of the gas that waits to detect, it is leading-in from advancing light mouth 52 with the light beam of quantum cascade laser again, the light beam of quantum cascade laser pierces through waits to detect gaseous and reflects from light-emitting window 53 after first reflector 2 and the reflection of second reflector 3, as shown in fig. 4, utilize the collection to reflect the light beam of light-emitting window 53 and handle, can acquire the density of gaseous granule that detects, detect gaseous pollution degree etc.

Just the utility model discloses with wind accuse device 91, air inlet 54, first reflector 2, second reflector 3, light inlet 52 and light-emitting mouth 53 and the integration of air chamber cavity 51 integrative, but the user of being convenient for uses. And the wind control device 91 capable of adjusting the wind speed is utilized to control the flow speed of the gas to be measured, and the amount of the sampled gas can be limited according to the length of the time. In addition, by using the wind control device 91, the dust remained on the air chamber cavity 51, the first reflector 2 and the second reflector 3 can be discharged by using airflow, so that the cleaning effect is achieved, the measurement precision of the quantum cascade laser is improved, and the problems that the amount and the flow speed of the sampled gas cannot be controlled and the cleaning function is not available in the conventional quantum cascade laser gas detection chamber are solved. In addition, by changing the incident angle of the beam of the qc laser from the light entrance 52, the path length of the beam can be changed. The longer the optical signal of the gas optical path to be measured is, the stronger the optical signal is, the higher the sensitivity of the test result is, so that the user can adjust the incident angle of the light speed according to the requirement of precision, and the use by the user is facilitated.

Specifically, in one embodiment, the zinc selenide lens window sheets 4 are mounted on both the light inlet 52 and the light outlet 53.

In one embodiment, to facilitate the installation of zinc selenide lens window sheet 4, light inlet 52 and light outlet 53 are both counter bored holes.

In one embodiment, to facilitate the installation of the first reflective mirror 2 and the second reflective mirror 3, the air chamber body 5 is opened at both ends with openings 55 communicating with the air chamber cavity 51, wherein the sealing cover 1 is disposed at one opening 55, and the wind control device 91 is disposed at the other opening 55.

In addition, in order to facilitate the installation of the wind control device 91, in an embodiment, the air chamber device further includes a mounting bracket 9 disposed at one end of the air chamber main body 5, and the wind control device 91 is disposed on the mounting bracket 9, that is, the mounting bracket 9 is located between the wind control device 91 and the air chamber main body 5.

In one embodiment, the plenum body 5 includes: two oppositely disposed first and third sidewalls 56 and 58 (not shown), and two oppositely disposed second and fourth sidewalls 57 and 58. The light outlet 53 is located on the second side wall 57 and is disposed near the wind control device 91. The light inlet 52 is located on the fourth side wall 58 and is disposed adjacent to the sealing cover 1. The first reflecting mirror 2 is disposed on the second side wall 57, and the second reflecting mirror 3 is disposed on the fourth side wall 58. The structural design can effectively utilize space, the light speed can be emitted from the light outlet 53 after being incident from the light inlet 52 and reflected by the reflector, and the path of the light speed can be longer so as to improve the sensitivity.

In one embodiment, to better fill the entire chamber 51 with the gas to be measured, the pneumatic control device 91 is a variable speed blower, and the air inlet 54 is located on the first sidewall 56 and near one end of the sealing cover 1.

Because of when detecting poisonous and harmful gas, need go on in sealed reagent bottle, for this reason, in order to let the utility model discloses applicable to and detect poisonous and harmful gas, in an embodiment, be provided with first gas coupling 7 on the air inlet 54, be connected with first hose 71 on the first gas coupling 7. A first fixing plate 92 is arranged at the exhaust port of the wind control device 91, a second air pipe joint 8 communicated with the exhaust port of the wind control device 91 is arranged on the first fixing plate 92, and a second hose 81 is connected to the second air pipe joint 8. And the reagent bottles are butted through the first hose 71 and the second hose 81 to form a sealing structure so as to realize the detection of toxic and harmful gases.

Specifically, in one embodiment, to connect the first hose 71 and the second hose 81, the first air pipe joint 7 and the second air pipe joint 8 are both self-locking air pipe joints. And in order to reduce the assembly steps of the present invention, the first fixing plate 92 is integrated with the mounting bracket 9.

Continuing to refer to fig. 5, the exhaust port 59 of the air chamber device 100 is directly opposite to the substrate 20, a flow passing port is arranged on the substrate 20 and aligned with the exhaust port 59 of the air chamber device 100, meanwhile, the air inlet 54 of the air chamber device 100 is arranged on the other side of the air chamber device 100 opposite to the exhaust port 59, the air inlet 54 and the exhaust port 59 are communicated with an air source outside the housing 10, and the stable supply of the gas to be measured in the air chamber device 100 is maintained; a sealing ring 80 is further arranged between the exhaust port 59 and the flow passing port in a padding manner for ensuring the sealing performance between the exhaust port 59 and the flow passing port, an exhaust guide nozzle 801 is further arranged on one side of the substrate 20 opposite to the air chamber device 100, the exhaust guide nozzle 801 is detachably installed in the flow passing port through threaded connection, the exhaust guide nozzle 801 is further provided with the second air pipe joint 88, the second air pipe joint 88 is matched with the exhaust guide nozzle 801, the second air pipe joint 88 is connected with a pipeline, and a second hose 8181 is quickly installed between the second air pipe joint 88 and the exhaust guide nozzle 801.

Further, the portable gas detector further comprises a first total reflector 501 and a second total reflector 502, the first total reflector 501 is arranged opposite to the laser 50 and is arranged at the light inlet 52 of the gas chamber device 100, the first total reflector 501 is used for refracting the laser emitted by the laser 50 into the light inlet 52, and the angle of the laser entering the gas chamber device 100 can be controlled only by adjusting the angle of the first total reflector 501; the second total reflection mirror 502 is disposed at the light exit 53 of the air chamber device 100 and opposite to the laser detector 60, and the angle of the laser beam entering the laser detector 60 can be adjusted by only adjusting the angle of the second total reflection mirror 502.

In addition, a beam splitter component 503 is further disposed between the laser detector 60 and the second total reflection mirror 502, and the beam splitter component 503 disperses the laser light, so that the laser detector 60 can perform analysis and detection conveniently.

The circuit control assembly comprises a main control board 301, a signal board 302, a collecting board 303 and a power board 304, the main control board 301, the signal board 302, the collecting board 303 and the power board 304 are all fixedly installed on the substrate 20, the collecting board 303 is used for collecting optical signals sent by the laser detector 60 and transmitting the collected signals to the signal board 302, the signal board 302 analyzes and processes the signals, processed data are transmitted to the main control board 301, the main control board 301 is provided with a bottom layer algorithm and a drawing library, specific substances are analyzed and compared, the power board 304 is used for power conversion, and stable voltage is provided.

The self-checking component comprises a self-checking sheet 401, the self-checking sheet 401 is movably arranged on the light path or outside the light path of the laser 50, the self-checking sheet 401 is made of standard Polystyrene (PS), when the laser detector 60 receives laser passing through the material, a specific standard spectrogram can be generated, the specific standard spectrogram is compared with a standard spectrogram of Polystyrene (PS) in a gallery, and if the light path through which the laser passes is finally judged to contain the PS, the gas detector operates normally and can start to detect.

Further, the self-checking assembly further includes a fixed block 402, a dial plate 403, a driving device 404 and a limiting assembly 405, the self-checking plate 401 is installed at one end of the dial plate 403, the other end of the dial plate 403 is fixed on the driving device 404, the driving device 404 drives the dial plate 403 to rotate, the driving device 404 is installed on the fixed block 402, the fixed block 402 is fixed with the substrate 20 and the housing 10 together through screws, the limiting assembly 405 includes two limiting posts, the two limiting posts are fixed at two sides of the dial plate 403 in opposite rotation directions, a certain space is provided between the two limiting posts, the dial plate 403 can only rotate between the two limiting posts, the driving device 404 drives the dial plate 403 to rotate, the self-checking plate 401 on the dial plate 403 is rotated to the transmitting end of the laser 50 and then located in the optical path of the laser 50, when the self-checking plate 401 is located in the optical path, the self-checking of the detector is performed, when the detector is operating normally, the self-checking piece 401 is rotated out of the light path by the shifting piece 403.

Preferably, the driving device 404 in this embodiment is a solenoid; in other embodiments, the driving device 404 may be an electric motor or the like.

Further, referring to fig. 1 to 5, the main heat generating components in the gas detector include a laser 50 and a circuit control component in an optical path component, in this application, a substrate 20 is disposed at the central portion of a housing 10, the laser 50 and the circuit control component are mounted at two sides of the substrate 20, the laser 50 and the circuit control component are both located in a first cavity 1014 and a second cavity 1024, a heat dissipation fan 70 is detachably connected to the substrate 20 through screws, the substrate 20 is provided with a first mounting opening 201, the laser 50 is mounted at one side of the first mounting opening 201, the heat dissipation fan 70 is correspondingly mounted at the other side of the first mounting opening 201, the heat dissipation fan 70 is opposite to the laser 50, an air inlet 105 opposite to the heat dissipation fan 70 is disposed on the housing 10, and an air outlet 104 corresponding to each circuit control component is further disposed on the housing 10, therefore, the heat dissipation fan 70 can circularly supply air to the inside of the housing 10, cold air enters from the air inlet 105 and is diffused in the first cavity 1014 and the second cavity 1024 to take away heat of the laser 50 and various circuit control components, and finally the heat is discharged from the air outlet 104, so that the purpose of heat dissipation of the whole gas detector is achieved; and two cavities are respectively arranged on two sides of the substrate 20, so that heat emitted by the laser 50 and the circuit control assembly can be discharged from two sides of the substrate 20 respectively, the heat dissipation area of the whole detector is increased, and the structural strength of the shell 10 is prevented from being influenced by the arrangement of too many air outlets 104 on one side of the detector.

In this embodiment, the heat dissipation fan 70, the power board 304, the acquisition board 303 and the signal board 302 are disposed in the second cavity 1024, the main control board 301 and the laser 50 are disposed in the first cavity 1014, the laser 50 is correspondingly mounted on one side of the first mounting port 201, and the heat dissipation fan 70 can directly dissipate heat of the laser 50 while introducing cold air to the detector; moreover, a second mounting port 202 is further disposed above the first mounting port 201 of the substrate 20, the second mounting port 202 is used for mounting the main control board 301, and after the main control board 301 is mounted on the second mounting port 202, an overflowing channel 203 is further reserved on the second mounting port 202, the overflowing channel 203 is communicated with the first cavity 1014 and the second cavity 1024 on two sides of the substrate 20, so as to facilitate diffusion of cold air, the cooling fan 70 corresponds to the air inlet 105 on the second cover 102, the main control board 301 corresponds to the air outlet 104 on the first cover 101, and the power board 304, the acquisition board 303 and the signal board 302 all have corresponding air outlets 104 on the second cover 102, so that each heating device inside the detector can be uniformly cooled, and the cooling effect of the detector is improved.

It should be added that one side of the main control board 301 is further provided with a plurality of radiating fins which are uniformly arranged, so as to improve the radiating efficiency of the main control board 301, and the radiating fins in this embodiment are disposed in the first cavity 1014, so as to avoid the heat in the second cavity 1024 from being too concentrated.

Further, heat dissipation holes 106 are further formed in the side portions of the first cover 101 and/or the second cover 102 parallel to the substrate 20, in this embodiment, the heat dissipation holes 106 are located at the side of the first cover 101, and the heat dissipation holes 106 are disposed near the heat dissipation fan 70, so as to facilitate air flow circulation.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A portable gas detector, comprising: a housing (10); a substrate (20) provided in the housing (10); install laser instrument (50), air chamber device (100) and laser detector (60) of base plate (20) one side, just air chamber device (100) are including advancing light entrance (52) and light-emitting window (53), the laser that laser instrument (50) sent enters into from advancing light entrance (52) in air chamber device (100), including relative setting in air chamber device (100) first reflector (2) and second reflector (3) that are used for refracting laser at its length direction both sides, through refracted laser by light-emitting window (53) incides into laser detector (60).

2. The portable gas detector according to claim 1, further comprising a first total reflection mirror (501) and a second total reflection mirror (502) disposed on the substrate (20), wherein the first total reflection mirror (501) is disposed at the light inlet (52) of the gas cell device (100) and opposite to the laser (50) for adjusting the angle of the laser light entering the gas cell device (100), and the second total reflection mirror (502) is disposed at the light outlet (53) of the gas cell device (100) and opposite to the laser detector (60) for adjusting the angle of the laser light entering the laser detector (60).

3. The portable gas detector according to claim 2, wherein a beam splitter assembly (503) is further provided between the laser detector (60) and the second total reflection mirror (502).

4. The portable gas detector according to claim 1, wherein the substrate (20) has a first mounting opening (201), the laser (50) is disposed opposite to the first mounting opening (201), and a heat dissipation fan (70) is disposed on a side of the first mounting opening (201) opposite to the laser (50).

5. The portable gas detector according to claim 1, wherein the gas cell device (100) is further provided with a gas inlet (54) and a gas outlet (59), the base plate (20) is provided with a flow port opposite to the gas outlet (59), and the portable gas detector further comprises:

the sealing ring (80) is arranged between the exhaust port (59) and the overflowing port in a cushioning mode;

an exhaust guide nozzle (801) which is arranged on one side of the substrate (20) relative to the air chamber device (100) and is detachably installed in the flow passing opening;

and the air pipe joint is matched with the exhaust guide nozzle (801).

6. The portable gas detector according to claim 1, wherein the housing (10) comprises: the first cover body (101) and the second cover body (102) are respectively arranged on two sides of the plate surface of the substrate (20) to oppositely clamp and seal the substrate (20), and the handle (103) is arranged at the end part of the substrate (20).

7. The portable gas detector according to claim 6, wherein the first cover (101) comprises a first rim (1011) arranged on one side of the substrate (20), a first cover plate (1012) arranged on the opposite side of the first rim (1011) to the substrate (20); the second cover body (102) comprises a second frame (1021) arranged on the other side of the substrate (20), and a second cover plate (1022) arranged on the opposite side of the second frame (1021) and the substrate (20).

8. The portable gas detector according to claim 1, further comprising a main control board (301), a signal board (302), a collection board (303) and a power supply board (304) mounted on the base board (20).

9. The portable gas detector according to claim 1, further comprising a self-test piece (401) movably disposed on or outside the optical path of the laser (50), and the laser detector (60) is connected to a library database, wherein the library database contains a spectrogram of laser light passing through the self-test piece (401), and the self-test piece (401) disposed in the optical path is used for detecting whether the gas detector is normal.

10. The portable gas detector according to claim 9, further comprising a dial (403), a driving device (404), and a limiting component (405), wherein the self-checking piece (401) is installed at one end of the dial (403), the other end of the dial (403) is connected to the driving device (404), the driving device (404) drives the dial (403) to rotate, and the limiting component (405) is arranged on two sides of the dial (403) in the rotating direction to limit the rotating angle of the dial (403).

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