CN210376127U

CN210376127U - Gas concentration detection device with mounting seat and combustible gas alarm device

Info

Publication number: CN210376127U
Application number: CN201921322124.6U
Authority: CN
Inventors: 卿笃安
Original assignee: Shenzhen Nuoan Environmental & Safety Inc
Current assignee: Shenzhen Noan Intelligent Co ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2020-04-21
Anticipated expiration: 2029-08-15

Abstract

The utility model provides a gas concentration detection device and combustible gas alarm device with mount pad, this gas concentration detection device with mount pad includes the light source, the concave surface speculum, binary channels detector and mount pad, light source mounting hole and detector mounting hole have been seted up on the mount pad, the light source assembles in the light source mounting hole, the binary channels detector assembles in the detector mounting hole, the concave surface speculum sets up with the mount pad relatively, the light that the light source sent shines to the concave surface speculum, the concave surface speculum assembles and reflection light to binary channels detector. Through setting up the mount pad to set up light source mounting hole and detector mounting hole simultaneously on the mount pad, with be used for installing light source and binary channels detector, can be so that the structure is compacter, and can fix light source and binary channels detector simultaneously through an element, and then reduced the quantity of component, and also reduced the installation complexity, be convenient for installation and dismantlement.

Description

Gas concentration detection device with mounting seat and combustible gas alarm device

Technical Field

The utility model relates to a gas concentration monitoring technology field especially relates to a gas concentration detection device and combustible gas alarm device with mount pad.

Background

The infrared combustible gas monitoring and alarming device has the advantages of long service life, good reliability, high detection precision and the like, is favored by users, and is particularly suitable for application occasions with high requirements on service life and reliability.

The infrared combustible gas monitoring and alarming device has more elements, so that the installation and disassembly processes are more complicated.

SUMMERY OF THE UTILITY MODEL

The utility model mainly provides a combustible gas alarm device and have gas concentration detection device of mount pad to solve the gas concentration detection device installation that has the mount pad and dismantle loaded down with trivial details technical problem.

In order to solve the technical problem, the utility model discloses a technical scheme be: the utility model provides a gas concentration detection device with mount pad, gas concentration detection device with mount pad includes light source, concave surface reflector, binary channels detector and mount pad, light source mounting hole and detector mounting hole have been seted up on the mount pad, the light source assemble in the light source mounting hole, the binary channels detector assemble in the detector mounting hole, the concave surface reflector with the mount pad sets up relatively, the light that the light source sent shines extremely the concave surface reflector, the concave surface reflector assemble and reflect light extremely the binary channels detector.

In order to solve the technical problem, the utility model discloses a technical scheme be: the combustible gas alarm device comprises an alarm and the gas concentration detection device with the mounting seat, wherein the alarm is electrically connected with the gas concentration detection device with the mounting seat and used for giving out alarm sound when the gas concentration detection device with the mounting seat detects that the concentration of combustible gas is greater than a preset value.

The utility model has the advantages that: the utility model discloses a set up the mount pad to set up light source mounting hole and detector mounting hole simultaneously on the mount pad, with be used for installing light source and binary channels detector, can be so that the structure is compacter, and can fix light source and binary channels detector simultaneously through an element, and then reduced the quantity of element, and also reduced the installation complexity, be convenient for installation and dismantlement.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is a schematic perspective view of a gas concentration detection apparatus having a mounting seat according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural view of the gas concentration detection apparatus having a mount in fig. 1;

FIG. 3 is a schematic perspective view of the adaptive reflector of FIG. 2;

fig. 4 is a schematic view of a processing flow of the adaptive reflector according to an embodiment of the present invention;

FIG. 5 is a perspective view of the mounting cartridge of FIG. 2;

FIG. 6 is a perspective view of the mounting base of FIG. 2;

FIG. 7 is an exploded view of the mount of FIG. 2 with the light source and dual channel detector;

FIG. 8 is a schematic view of a portion of the enlarged structure of FIG. 2;

FIG. 9 is a perspective view of the mounting cartridge of FIG. 2;

fig. 10 is a schematic flow chart of a gas concentration detection method according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The infrared combustible gas monitoring and alarming device has the advantages of long service life, good reliability, high detection precision and the like, is favored by users, and is particularly suitable for application occasions with high requirements on service life and reliability. Because the component quantity among the infrared combustible gas monitoring combustible gas alarm device is more, lead to installing and the process of dismantling comparatively loaded down with trivial details, consequently, the utility model provides a gas concentration detection device 100 with mount pad, through setting up the mount pad to set up light source mounting hole and detector mounting hole simultaneously on the mount pad, with be used for installing light source and binary channels detector, can make the structure compacter, and can fix light source and binary channels detector simultaneously through an component, and then reduced the quantity of component, and also reduced the installation complexity, be convenient for install and dismantle.

The present invention provides a gas concentration detecting device 100 with a mounting seat, please refer to fig. 1 and fig. 2, fig. 1 is a schematic perspective view of the gas concentration detecting device with a mounting seat according to an embodiment of the present invention, and fig. 2 is a schematic sectional view of the gas concentration detecting device with a mounting seat in fig. 1. Gas concentration detection device 100 with mount pad includes light source 10, concave mirror 40, two channel detector 30 and mount pad 60, light source mounting hole 62 and detector mounting hole 64 have been seted up on the mount pad 60, light source 10 assembles in light source mounting hole 62, two channel detector 30 assemble in detector mounting hole 64, concave mirror 40 sets up with mount pad 60 relatively, the light that light source 10 sent shines to concave mirror 40, concave mirror 40 assembles and reflects light to two channel detector 30.

The embodiment of the utility model provides a through setting up mount pad 60 to set up light source mounting hole 62 and detector mounting hole 64 simultaneously on mount pad 60, with be used for installing light source 10 and binary channels detector 30, can make the structure compacter, and can fix light source 10 and binary channels detector 30 simultaneously through an element, and then reduced the quantity of component, and also reduced the installation complexity, be convenient for install and dismantle, improved the installation accuracy simultaneously.

Further, as shown in fig. 2, the gas concentration detection apparatus with mounting base 100 further includes a mounting cylinder 50, and the mounting cylinder 50 has a first end 51 and a second end 53 opposite to each other. The mounting base 60 is connected to the first end 51 of the mounting tube 50, and the concave reflecting mirror 40 is disposed at the second end 53 of the mounting tube 50. By providing the mounting tube 50, the light source 10, the concave reflecting mirror 40, and the dual-channel detector 30 can be integrated, which facilitates mounting.

Alternatively, as shown in fig. 2, the axes of the light source mounting hole 62 and the detector mounting hole 64 are disposed obliquely with respect to the axis of the mounting cylinder 50.

In the present embodiment, as shown in fig. 2, the axis of the light source mounting hole 62 and the axis of the detector mounting hole 64 are symmetrically disposed about the axis of the mounting tube 50, so that the light focused by the concave reflector 40 can vertically enter the dual-channel detector 30, thereby improving the utilization rate of the light energy.

Further, as shown in fig. 2 and 5, fig. 5 is a schematic perspective view of the mounting barrel in fig. 2. The mounting tube 50 includes a mounting portion 52 and a tube body portion 54, the tube body portion 54 is hollow and connected to one side of the mounting portion 52, a mounting groove 522 is opened on a surface of the mounting portion 52 away from the tube body portion 54, the mounting seat 60 is accommodated in the mounting groove 522, the light source 10 and the dual-channel detector 30 are fixed on the mounting seat 60, and the concave reflector 40 is disposed on one side of the tube body portion 54 away from the mounting portion 52. The bottom of the mounting groove 522 is provided with an avoiding hole 524 for communicating the mounting groove 522 with the inside of the barrel 54, light emitted from the light source 10 enters the concave reflector 40 through the avoiding hole 524, and the light condensed and reflected by the concave reflector 40 enters the dual-channel detector 30 through the avoiding hole 524.

In this embodiment, as shown in fig. 2, 5 and 6, fig. 6 is a schematic perspective view of the mounting base in fig. 2. The mounting groove 522 is a stepped groove, the stepped groove includes a first groove 521 and a second groove 523, the first groove 521 is nested in the bottom of the second groove 523, and the avoiding hole 524 is located on the bottom surface of the first groove 521. The mount 60 includes a fixing portion 61 and a connecting portion 63, and a light source mounting hole 62 and a detector mounting hole 64 are opened in the fixing portion 61. The fixing portion 61 is accommodated in the first recess 521, and the connecting portion 63 is fixedly connected to the bottom surface of the second recess 523. The installation groove 522 is set to be a stepped groove, so that the installation seat 60 is limited conveniently and the installation seat 60 is prevented from moving; on the other hand, the axial length of the mounting seat 60 and the mounting cylinder 50 can be shortened, so that the structure is more compact and the size is smaller.

Wherein, in this embodiment, the fixing portion 61 and the connecting portion 63 are an integral structure, and certainly, in other embodiments, the fixing portion 61 and the connecting portion 63 may be detachably connected, and the embodiment of the present invention is not particularly limited.

Alternatively, in the present embodiment, the mounting grooves 522 are provided as circular grooves, the connecting portions 63 have a ring shape, and the ring-shaped connecting portions 63 are provided at opposite sides of the fixing portion 61. By providing the annular connecting portion 63, the volume of the connecting portion 63 can be reduced, and it is convenient to provide other elements in the mounting groove 522, so that the structure is more compact and the volume is smaller.

Further, as shown in fig. 2, the gas concentration detection apparatus 100 with a mounting base further includes an adaptive reflector 20, the adaptive reflector 20 is mounted in the light source mounting hole 62, a reflective groove 22 is formed on the surface of the adaptive reflector 20, a reflective surface 221 is formed on a side wall of the reflective groove 22, and the light source 10 is mounted in the center of the reflective groove 22.

Specifically, in the present embodiment, the reflective groove 22 is a groove having an opening, and the light emitted from the light source 10 exits through the opening. The groove is trumpet-shaped and is used for emitting the converged light.

As shown in fig. 4, fig. 4 is a schematic view of a processing flow of the adaptive light reflector according to an embodiment of the present invention. The adaptive reflector 20 can be manufactured by the following manufacturing steps:

s101: the filament shape sizes of the plurality of light sources 10 are counted.

S102: the filament shape size of the light source 10 is used for modeling to obtain an optimal shape curve of the light reflecting surface 221.

S103: the optimal shape curve of the reflecting surface 221 is utilized to process the reflecting groove 22 on the adaptive reflecting member 20, polish the side wall of the reflecting groove 22, and plate a layer of anti-oxidation protection film 24 on the polished side wall of the reflecting groove 22.

In this embodiment, the oxidation preventing protective film 24 may be an aluminum reflective film, and of course, in other embodiments, other types of oxidation preventing protective films 24 may be plated or coated as needed, for example: 50-200 nm gold film, 50-200 nm silver film, 100-200 nm titanium dioxide film, 100-200 nm vanadium pentoxide film, 100-200 nm silicon dioxide film, 100-200 nm magnesium fluoride film and 100-200 nm silicon nitride film, wherein the films are not only oxidation-resistant but also high in reflectivity. The anti-oxidation protective film 24 plated on the side wall of the light reflecting groove 22 can prevent the side wall of the light reflecting groove 22 from being oxidized, thereby improving the reflectivity of the light reflecting surface 221 and reducing the light loss.

By covering the adaptive reflector 20 outside the light source 10, the light emitted from the light source 10 can be collimated to improve the light intensity of the emergent light of the light source 10, reduce the light loss in the light transmission process, and further improve the light intensity incident to the dual-channel detector 30.

Further, as shown in fig. 7, fig. 7 is an exploded schematic view of the mounting base, the light source and the dual-channel detector in fig. 2. The hole wall of the detector mounting hole 64 and the outer wall of the dual-channel detector 30 are respectively provided with a limit groove 642 and a limit column 32 which are matched with each other. Through set up spacing post 32 and spacing groove 642 of mutually supporting between the pore wall at two channel detector 30 and detector mounting hole 64, can be convenient for fix a position two channel detector 30, prevent that two channel detector 30 from rotating in detector mounting hole 64, and then promote the stability of being connected of two channel detector 30 and self-adaptation reflection of light piece 20.

Further, a fixing hole 65 is opened on the mounting seat 60, and the gas concentration detection apparatus 100 with the mounting seat further includes a temperature sensor 70, and the temperature sensor 70 is disposed in the fixing hole 65.

Specifically, as shown in fig. 7, a fixing hole 65 is opened on a surface of the mounting seat 60 facing away from the mounting tube 50, and the temperature sensor 70 is disposed in the fixing hole 65 for detecting the temperature of the circuit board in the dual-channel detector 30 and giving a prompt when detecting that the temperature of the circuit board is high, so as to prevent the gas concentration detection apparatus 100 having the mounting seat from being damaged due to too high temperature.

Alternatively, in the present embodiment, the fixing hole 65 is a blind hole opened on the mount 60, and the temperature sensor 70 may be fixed in the fixing hole 65 by an adhesive or a screw, or the like, to improve the integration of the gas concentration detection apparatus 100 having the mount and to reduce the volume of the gas concentration detection apparatus 100 having the mount. Of course, in other embodiments, the fixing hole 65 may also be a through hole, and the embodiment of the present invention is not particularly limited.

In this embodiment, the light source is a mid-infrared light source emitting a wavelength band between 3000 nm and 7000 nm, and light in this wavelength band is more easily absorbed by the gas to be detected, for example, the absorption intensity of methane to light with a wavelength of 3310nm is 200 times that of light with a wavelength of 1670nm, so as to improve the detection accuracy of the gas concentration detection apparatus with multiple mounting seats. The central wavelength of the first wavelength light can be set to 3200nm to 3400nm, and the light in this wavelength band is more easily absorbed by methane, for example, the absorption intensity of methane for the light with the wavelength of 3310nm is 200 times that of the light with the wavelength of 1670nm, thereby improving the detection accuracy of the dual-channel detector 30. The central wavelength of the first wavelength light can be set to be 4200 nm-4300 nm, and the light in the wavelength band is easier to be absorbed by carbon dioxide. The central wavelength of the light of the first wavelength may also be set to 4600nm to 4700nm, which is more easily absorbed by carbon monoxide. The central wavelength of the second wavelength light may be set to 3930nm to 3950nm, and light in this wavelength band is not easily absorbed by the gas.

The utility model discloses another aspect still provides a combustible gas alarm device, and combustible gas alarm device includes the alarm and has the gas concentration detection device of mount pad, and the alarm is connected with the gas concentration detection device electricity that has the mount pad for the concentration that detects combustible gas at the gas concentration detection device that has the mount pad is greater than the default and sends the warning sound.

In this embodiment, the structure of the gas concentration detection apparatus with a mounting seat is the same as that of the gas concentration detection apparatus 100 with a mounting seat in the above embodiment, please refer to the description in the above embodiment, and the description thereof is omitted here. The default of combustible gas concentration can set up according to explosion-proof demand, the embodiment of the utility model provides a do not specifically prescribe a limit.

The present invention provides a gas concentration detecting device 100 with a mounting seat, please refer to fig. 1 and fig. 2, fig. 1 is a schematic perspective view of the gas concentration detecting device with a mounting seat according to an embodiment of the present invention, and fig. 2 is a schematic sectional view of the gas concentration detecting device with a mounting seat in fig. 1. Gas concentration detection device 100 with mount pad includes light source 10, self-adaptation reflection of light piece 20 and double-channel detector 30, light source 10 installs in self-adaptation reflection of light piece 20, the light that light source 10 sent shines to double-channel detector 30 after the self-adaptation reflection of light piece 20 focuses on, double-channel detector 30 is including being located the detection passageway and the reference passageway on same horizontal plane, the detection passageway is used for detecting the first light intensity of the first wavelength light after being absorbed by gas, the reference passageway is used for detecting the second light intensity of the second wavelength light that is not absorbed by gas, obtain the concentration of gas through first light intensity and second light intensity. The detection channel and the reference channel are located on the same horizontal plane, so that incident light entering the detection channel and the reference channel can enter the detection channel and the reference channel at the same time, the compensation error is reduced, and the detection precision of the gas concentration detection device 100 with the installation seat is improved.

The embodiment of the utility model provides a through installing light source 10 in self-adaptation reflection of light piece 20, utilize self-adaptation reflection of light piece 20 to carry out the collimation to the light that light source 10 sent to promote the luminous intensity of light source 10 emergent light, reduce the light loss among the light transmission process, and then promote the luminous intensity of incidenting to binary channels detector 30, promote binary channels detector 30's detectivity and detection precision, and then promote the detection precision that has the gas concentration detection device 100 of mount pad.

In this embodiment, the dual-channel detector 30 may be a pyroelectric combustible gas detector, and includes a photo resistor and a circuit board electrically connected to the photo resistor, the photo resistor changes its resistance value under the irradiation of light to change the current flowing through the photo resistor, the circuit board receives the current and converts the current into a periodic electrical signal, and the electrical signal is amplified and conditioned by a circuit and then converted into a digital signal by an a/D converter.

Specifically, the two detection channels convert the detected light intensity into an electric signal, and the two channel signals are subjected to differential processing to eliminate light intensity disturbance interference caused by power fluctuation and propagation loss of a light source, so that the light intensity differential change detected under the action of gas absorption is obtained. Under the same action distance of light and gas, the light intensity differential signal change of the dual-channel detector 30 increases along with the increase of the gas concentration, so that a mathematical relation curve in one-to-one correspondence of the gas concentration and the light intensity differential signal of the dual-channel detector 30 is established, the gas concentration sensing measurement is realized, and the dual-channel detector 30 is formed.

Of course, in other embodiments, other types of dual-channel detectors 30 may also be used as needed, and the embodiments of the present invention are not limited in particular.

As shown in fig. 2 and 3, fig. 3 is a schematic perspective view of the adaptive reflector in fig. 2. In this embodiment, the adaptive reflector 20 has a reflective groove 22 formed on the surface thereof, the side wall of the reflective groove 22 forms a reflective surface 221, and the light source 10 is installed at the center of the reflective groove 22.

Further, referring to fig. 2 and 3, the adaptive reflector 20 includes a light source portion 21 and a light reflecting portion 23 connected to the light source portion 21, the light source portion 21 is provided with an assembling hole 212, the light reflecting portion 23 is provided with a light reflecting groove 22, and the light source 10 is installed in the assembling hole 212 and extends into the light reflecting groove 22.

Specifically, in the present embodiment, the reflective groove 22 is opened on the reflective portion 23, the mounting hole 212 extends through the light source portion 21 from the center of the reflective groove 22, and the light source 10 is installed in the mounting hole 212 and extends into the reflective groove 22. By forming the fitting hole 212 for fitting the light source 10 on the adaptive reflecting member 20, it is possible to facilitate fixing the light source 10, to make the internal structure of the gas concentration detection apparatus 100 having a mounting seat more compact, and also to reduce the volume of the gas concentration detection apparatus 100 having a mounting seat. In addition, the structure of the adaptive reflector 20 also facilitates a fixed connection to facilitate installation of the adaptive reflector 20.

In another embodiment, the adaptive reflector 20 is provided as a reflector, with the light source 10 mounted in the center of the reflector. Since the reflector is processed conveniently, the processing cost of the gas concentration detection apparatus 100 having the mount can be reduced.

Optionally, the light reflected and emitted by the adaptive light reflector 20 may be parallel light, so as to reduce the diffusion of light, avoid the light from contacting obstacles in the transmission process, enable a greater proportion of light to be incident on the dual-channel detector 30, and further improve the light energy utilization rate of the light source 10.

In this embodiment, the opening angle of the light reflected and emitted through the adaptive reflector 20 is set to be less than 15 °. Wherein, the field angle of the light ray refers to: the maximum included angle between the direction of the emergent light and the light-emitting direction of the light source 10. The opening angle of the light is smaller than 15 degrees, so that the high light energy utilization rate can be met, the processing precision of the reflecting surface 221 is reduced, and the processing cost is further reduced.

Further, in the present embodiment, as shown in fig. 3, the light reflecting surface 221 of the adaptive light reflector 20 is a smooth curved surface, so as to reduce the processing difficulty. Of course, in other embodiments, the light reflecting surface 221 may be formed by splicing a plurality of planes. For example, a plurality of triangular planes may be connected in series. Or formed by splicing a plurality of hexagonal planes in sequence. Or adopt the plane concatenation of other polygons to form, the embodiment of the utility model provides a do not specifically restrict.

Further, as shown in fig. 2 and 5, the gas concentration detection apparatus with mount 100 further includes a concave mirror 40 and a mounting tube 50, the mounting tube 50 having a first end 51 and a second end 53 opposite to each other. The light source 10 and the dual channel detector 30 are disposed at a first end 51 of the mounting tube 50, and the concave mirror 40 is disposed at a second end 53 of the mounting tube 50. The light emitted from the light source 10 is reflected by the concave reflector 40 and then irradiated to the dual-channel detector 30. This embodiment is through setting up concave reflector 40, can focus in order to promote the luminous intensity to the emergent light of light source 10 on the one hand, and on the other hand also can shorten the distance between light source 10 and the double-channel detector 30 under the condition of guaranteeing certain optical path for the structure is compacter, and then reduces the volume that has the gas concentration detection device 100 of mount pad. In this embodiment, the concave reflector 40 is formed by processing glass, performing mirror polishing, and finally plating gold. In the embodiment, the concave reflector 40 is arranged, so that the light energy can be converged on the dual-channel detector 30 to make up for the defects of small photosensitive surface and low sensitivity of the dual-channel detector 30.

In this embodiment, the structure of the gas concentration detection apparatus with a mounting seat is the same as that of the gas concentration detection apparatus 100 with a mounting seat in the above embodiment, please refer to the description in the above embodiment, and the description thereof is omitted here. The default of combustible gas's concentration can set up according to combustible gas's kind and explosion-proof installation level, the embodiment of the utility model provides a do not specifically prescribe a limit to.

The present invention provides a gas concentration detecting device 100 with a mounting seat, please refer to fig. 1 and fig. 2, fig. 1 is a schematic perspective view of the gas concentration detecting device with a mounting seat according to an embodiment of the present invention, and fig. 2 is a schematic sectional view of the gas concentration detecting device with a mounting seat in fig. 1. Gas concentration detection device 100 with mount pad includes light source 10, concave mirror 40, binary channels detector 30, insulating mirror 80 and installation section of thick bamboo 50, installation section of thick bamboo 50 has mounting groove 522, detect chamber 55 and intercommunication mounting groove 522 and detect the hole 524 of dodging of chamber 55, it is used for the holding gas that awaits measuring to detect the chamber 55, light source 10 and binary channels detector 30 are located in mounting groove 522, concave mirror 40 is located in detecting the chamber 55, insulating mirror 80 covers dodging hole 524 in order to keep apart and detect chamber 55 and mounting groove 522, the light of light source 10 transmission shines to concave mirror 40 through dodging hole 524, the light that concave mirror 40 assembles and reflect is through dodging hole 524 incident binary channels detector 30.

The embodiment of the utility model provides a cover the lens 80 of dodging hole 524 through the setting, can keep apart the mounting groove 522 that installs light source 10 and binary channels detector 30 and the gaseous detection chamber 55 that is used for the holding to await measuring to can prevent to be located the gaseous entering mounting groove 522 in detecting chamber 55, avoid the gaseous electrical part of gaseous contact light source 10 and binary channels detector 30 that await measuring, and blast, and then promote the security performance that has the gas concentration detection device 100 of mount pad.

Wherein, in this embodiment, the isolation mirror 80 can allow the infrared light to penetrate through to detect the concentration of the gas to be measured in the infrared light range, and then avoid the influence of ambient light, promote the detection precision.

Optionally, the isolation mirror 80 may be a sapphire lens, a calcium fluoride lens, a silicon wafer, or the like, and the embodiment of the present invention is not particularly limited.

Further, as shown in fig. 2 and 6, the gas concentration detection apparatus 100 with a mounting seat further includes a mounting seat 60, the mounting seat 60 is disposed in the mounting groove 522, the mounting seat 60 is provided with a light source mounting hole 62 and a detector mounting hole 64, the light source 10 is mounted in the light source mounting hole 62, and the dual-channel detector 30 is mounted in the detector mounting hole 64. Through setting up mount pad 60 to set up light source mounting hole 62 and detector mounting hole 64 simultaneously on mount pad 60, with be used for installing light source 10 and binary channels detector 30, can make the structure compacter, and can fix light source 10 and binary channels detector 30 simultaneously through an component, and then reduced the quantity of component, and also reduced the installation complexity, be convenient for installation and dismantlement.

Further, as shown in fig. 2, 5 and 6, the mounting groove 522 is a step groove, the step groove includes a first groove 521 and a second groove 523 that are nested, the first groove 521 is nested at the bottom of the second groove 523, and the avoiding hole 524 is located at the bottom surface of the first groove 521. The mounting base 60 includes a fixing portion 61 and a connecting portion 63, the light source mounting hole 62 and the detector mounting hole 64 are opened on the fixing portion 61, the fixing portion 61 is accommodated in the first recess 521, and the connecting portion 63 is fixedly connected to the bottom surface of the second recess 523. The installation groove 522 is set to be a stepped groove, so that the installation seat 60 is limited conveniently and the installation seat 60 is prevented from moving; on the other hand, the axial length of the mounting seat 60 and the mounting cylinder 50 can be shortened, so that the structure is more compact and the size is smaller.

In the present embodiment, as shown in fig. 2 and 8, fig. 8 is a schematic diagram of a partially enlarged structure in fig. 2. The isolation mirror 80 is located in the mounting groove 522, the bottom surface of the first groove 521 is provided with a lens mounting groove 82, the isolation mirror 80 is located in the lens mounting groove 82, and the fixing portion 61 abuts against the isolation mirror 80. Through setting up the lens mounting groove 82 that is used for holding isolation mirror 80, can inject the removal of isolation mirror 80, only need utilize fixed part 61 butt in the terminal surface that exposes in lens mounting groove 82 of isolation mirror 80, can accomplish the fixed of isolation mirror 80, and then simplify the fixed knot structure of isolation mirror 80 for it is more convenient to install and dismantle.

Alternatively, as shown in fig. 8, the gas concentration detection apparatus 100 with a mounting base further includes an elastic member 90, and the elastic member 90 is elastically interposed between the fixing portion 61 and the isolation mirror 80. By providing the elastic member 90 between the contact surfaces of the insulating mirror 80 and the fixing portion 61, the fixing portion 61 and the insulating mirror 80 are prevented from being in hard contact to damage the insulating mirror 80.

Wherein, in the present embodiment, the elastic member 90 is provided as an elastic washer. Because the elastic washer is a common standard part, the elastic part 90 is set as the elastic washer, so that the production cost can be reduced, and the elastic washer can be conveniently replaced when damaged. In addition, the annular gasket may also avoid obstructing the clearance hole 524. The material used for manufacturing the elastic member 90 may be plastic, silica gel, etc., and the embodiment of the present invention is not limited specifically.

In another embodiment, the isolation mirror 80 is located in the detection chamber 55 and is adhesively attached to the mounting cylinder 50. Specifically, the isolation mirror 80 is disposed on the surface of the detection cavity 55 where the avoiding hole 524 is formed to seal the detection cavity 55. In the present embodiment, the insulating mirror 80 may be bonded to the mounting tube 50 with an adhesive. Of course, fasteners may also be used for connection, and the embodiments of the present invention are not limited specifically.

The present invention provides a gas concentration detecting device 100 with a mounting seat, please refer to fig. 1 and fig. 2, fig. 1 is a schematic perspective view of the gas concentration detecting device with a mounting seat according to an embodiment of the present invention, and fig. 2 is a schematic sectional view of the gas concentration detecting device with a mounting seat in fig. 1. Gas concentration detection device 100 with mount pad includes light source 10, concave mirror 40 and two channel detector 30, the light that light source 10 sent shines to concave mirror 40, concave mirror 40 assembles and reflects light to two channel detector 30, the distance between two channel detector 30 and the concave mirror 40 equals the radius of curvature of concave mirror 40, two channel detector 30 includes detection channel and reference channel, the detection channel is used for detecting the first light intensity of the first wavelength light after being absorbed by the gas, the reference channel is used for detecting the second light intensity of the second wavelength light that is not absorbed by the gas, obtain the concentration of gas through first light intensity and second light intensity.

In the present embodiment, under the same action distance between light and gas, the light intensity differential signal of the dual-channel detector 30 changes more with the increase of the gas concentration, so that a mathematical relationship curve corresponding to the gas concentration and the light intensity differential signal of the detector one to one is established to realize the sensing measurement of the gas concentration, thereby forming the dual-channel detector 30. Meanwhile, the integrated dual-channel detector 30 is used for simultaneously detecting the first wavelength light and the second wavelength light, so that the first wavelength light and the second wavelength light have the same source and propagation path, and the light intensity disturbance caused by the external environment, reflection scattering and the like is the same as the light loss, so that the light intensity disturbance caused by the light source intensity fluctuation and the propagation loss can be effectively eliminated by utilizing the differential signal processing of the first wavelength light and the second wavelength light, and the detection precision of the gas concentration detection device 100 with the mounting seat is improved.

The embodiment of the utility model provides a set up the radius of curvature that the distance between concave mirror 40 and the binary channels detector 30 equals concave mirror 40, be about to binary channels detector 30 and set up the curvature center position department at concave mirror 40, can guarantee that the focus after concave mirror 40 focuses is located binary channels detector 30, and then promotes binary channels detector 30's incident light intensity, promotes binary channels detector 30's detectivity, and then promotes the detection precision that has the gas concentration detection device 100 of mount pad.

In the present embodiment, the path length of the light emitted from the light source 10 to the incident dual-channel detector 30 is 6-20 cm. For example, the path length may be set to 6cm, 7cm, 8cm, 9cm, 10cm, 11cm, 12cm, 13cm, 14cm, 15cm, 16cm, 17cm, 18cm, 19cm, or 20cm, and the like, and the path length may be flexibly set according to the type of the gas to be measured, which is not particularly limited in the embodiment of the present invention.

Further, as shown in fig. 2, the gas concentration detection apparatus with mounting base 100 further includes a mounting cylinder 50, and the mounting cylinder 50 has a first end 51 and a second end 53 opposite to each other. The mounting tube 50 is hollow, the light source 10 and the dual-channel detector 30 are disposed at a first end 51 of the mounting tube 50, and the concave reflector 40 is disposed at a second end 53 of the mounting tube 50. By providing the mounting tube 50, the light source 10, the concave reflecting mirror 40, and the dual-channel detector 30 can be integrated, which facilitates mounting.

As shown in fig. 2 and 9, fig. 9 is a schematic perspective view of the mounting barrel in fig. 2. The second end 53 of the mounting tube 50 is provided with a reflector mounting hole 56, the concave reflector 40 is arranged in the reflector mounting hole 56, the aperture of the reflector mounting hole 56 is larger than the inner diameter of the mounting tube 50, and the axis of the reflector mounting hole 56 coincides with the axis of the mounting tube 50. By providing the mirror mounting hole 56 at the second end 53 of the mounting tube 50 and disposing the concave mirror 40 in the mirror mounting hole 56, the concave mirror 40 can be protected, the axial length of the gas concentration detection apparatus 100 having the mounting seat can be shortened, and the volume of the gas concentration detection apparatus 100 having the mounting seat can be reduced.

In another embodiment, the concave reflecting mirror 40 may also be directly disposed on the end surface of the second end 53 of the mounting cylinder 50, or disposed at an interval with the end surface of the second end 53 of the mounting cylinder 50, which is not limited in the embodiment of the present invention.

Further, as shown in fig. 2 and 5, vent holes 57 are opened in both opposite side walls of the mounting tube 50. The gas concentration detection device 100 with the mounting seat further comprises a calibration cover 110, the calibration cover 110 is sleeved on the outer side of the mounting cylinder 50 and is connected with the first end 51 of the mounting cylinder 50 to form a detection cavity 55, the detection cavity 55 is communicated with the inside of the mounting cylinder 50, and an air inlet 112 and an air outlet 114 are formed in the calibration cover 110.

Specifically, in the present embodiment, the calibration cover 110 is cylindrical, an opening is disposed on one end surface, the calibration cover 110 covers the outer side of the mounting cylinder 50, and the surface of the calibration cover 110, on which the opening is formed, is connected to the first end 51 of the mounting cylinder 50, so as to form the detection cavity 55 in a sealed manner. An air inlet 112 and an air outlet 114 are formed in the detection cavity 55, the gas to be detected enters the detection cavity 55 through the air inlet 112, and the gas to be detected flows out of the air outlet 114.

Wherein, the air inlet hole 112 is located on the side wall of the calibration cover 110 and located in the projection range of the vent hole 57 on the side wall, and the air outlet hole 114 is located on the end surface of the calibration cover 110 far away from the first end 51 of the mounting cylinder 50. Through set up the inlet port 112 in the projection range of air vent 57 on the lateral wall, can increase the content that is located the gaseous body of awaiting measuring in air vent 57, and then promote the gaseous detection precision of awaiting measuring.

Optionally, as shown in fig. 2, an air inlet 112 is disposed on a side of the calibration cover 110 close to the light source 10 to extend a flow path of the gas to be detected, so as to increase the gas content of the gas to be detected in the detection cavity 55 and reduce the influence of air on the concentration of the gas to be detected.

Further, as shown in fig. 2 and 6, the gas concentration detection apparatus 100 with a mounting base further includes a mounting base 60, the mounting base 60 is provided with a light source mounting hole 62 and a detector mounting hole 64, the light source 10 is mounted in the light source mounting hole 62, and the dual-channel detector 30 is mounted in the detector mounting hole 64. By providing the mounting tube 50, the light source 10, the concave reflecting mirror 40, and the dual-channel detector 30 can be integrated, which facilitates mounting.

Optionally, as shown in fig. 2, in the present embodiment, the axis of the light source mounting hole 62 and the axis of the detector mounting hole 64 are symmetrically disposed about the axis of the mounting cylinder 50, so that the light focused by the concave reflector 40 can vertically enter the dual-channel detector 30, thereby improving the utilization rate of light energy.

The present invention provides a gas concentration detecting device 100 with a mounting seat, please refer to fig. 1 and fig. 2, fig. 1 is a schematic perspective view of the gas concentration detecting device with a mounting seat according to an embodiment of the present invention, and fig. 2 is a schematic sectional view of the gas concentration detecting device with a mounting seat in fig. 1. Gas concentration detection device 100 with mount pad includes light source 10, concave mirror 40 and two-channel detector 30, the light that light source 10 sent shines to concave mirror 40, concave mirror 40 assembles and reflects light to two-channel detector 30, two-channel detector 30 is including being located detection passageway and the reference channel on same horizontal plane, the detection passageway is used for detecting the first light intensity of the first wavelength light after being absorbed by gas, the reference channel is used for detecting the second light intensity of the second wavelength light that is not absorbed by gas, obtain gaseous concentration through first light intensity and second light intensity. The detection channel and the reference channel are located on the same horizontal plane, so that incident light entering the detection channel and the reference channel can enter the detection channel and the reference channel at the same time, the compensation error is reduced, and the detection precision of the gas concentration detection device 100 with the installation seat is improved.

The embodiment of the utility model provides a through setting up concave surface mirror 40, can improve the luminous intensity that reachs binary channels detector 30, and then promote binary channels detector 30's sensitivity, be located same horizontal plane through the sense passage that sets up in the binary channels detector 30 and reference the passageway, can make the incident light that gets into in sense passage and the reference passageway get into simultaneously, and then reduce the compensation error, promote the detection precision that has the gas concentration detection device 100 of mount pad.

In the present embodiment, the gas concentration detection apparatus 100 with a mount includes a first narrow band filter provided in the detection channel and a second narrow band filter provided in the reference channel. The light entering the detection channel is filtered by the first narrow band filter to obtain first wavelength light, the light entering the reference channel is filtered by the second narrow band filter to obtain second wavelength light, the first wavelength light can be absorbed by gas, and the second wavelength light cannot be absorbed by the gas. The detection spectrum wave band can be flexibly selected by arranging the first narrow-band filter and the second narrow-band filter.

The fact that the light with the second wavelength cannot be absorbed by the gas means that, in an ideal situation, the gas does not have the capability of absorbing the light with the second wavelength, that is, in an ideal situation, after the light with the second wavelength passes through the gas, the energy of the light with the second wavelength does not change.

Specifically, in the present embodiment, the light source is a mid-infrared light source emitting a wavelength band between 3000 nm and 7000 nm, and light in this wavelength band is more easily absorbed by the gas to be detected, for example, the absorption intensity of methane for light with a wavelength of 3310nm is 200 times that of light with a wavelength of 1670nm, so that the detection accuracy of the gas concentration detection apparatus with multiple mounting seats is improved. The central wavelength of the first wavelength light can be set to 3200nm to 3400nm, and the light in this wavelength band is more easily absorbed by methane, for example, the absorption intensity of methane for the light with the wavelength of 3310nm is 200 times that of the light with the wavelength of 1670nm, thereby improving the detection accuracy of the dual-channel detector 30. The central wavelength of the first wavelength light can be set to be 4200 nm-4300 nm, and the light in the wavelength band is easier to be absorbed by carbon dioxide. The central wavelength of the light of the first wavelength may also be set to 4600nm to 4700nm, which is more easily absorbed by carbon monoxide. The central wavelength of the second wavelength light may be set to 3930nm to 3950nm, and light in this wavelength band is not easily absorbed by the gas.

Because the gas to be detected has a strong absorption effect on the first-wavelength light and the gas to be detected has no absorption effect on the second-wavelength light, when the emergent light of the light source 10 passes through the region of the gas to be detected, the energy of the first-wavelength light is reduced, and the energy of the second-wavelength light is not changed basically, so that a first light intensity corresponding to the energy of the first-wavelength light and a second light intensity corresponding to the energy of the second-wavelength light can be obtained, and further, the concentration of the gas to be detected can be obtained through calculation of the first light intensity and the second light intensity.

Optionally, in an embodiment, the light reflected and emitted by the adaptive light reflector 20 may be parallel light, so as to reduce the diffusion of light, avoid the light from contacting obstacles during the transmission process, make a greater proportion of light incident on the dual-channel detector 30, and further improve the light energy utilization rate of the light source 10.

In the present embodiment, the field angle of the light reflected and emitted by the adaptive light reflector 20 is set to be less than 15 °, where the field angle of the light refers to: the maximum angle between the direction of the light and the light emitting direction of the light source 10. The opening angle of the light is smaller than 15 degrees, so that the high light energy utilization rate can be met, the processing precision of the reflecting surface 221 is reduced, and the processing cost is further reduced.

Further, as shown in fig. 2, 5 and 6, the gas concentration detection apparatus 100 with a mounting seat further includes a mounting cylinder 50 and a mounting seat 60, the mounting cylinder 50 having a first end 51 and a second end 53 opposite to each other. The mount 60 is connected to the first end 51 of the mounting tube 50, and the light source 10 and the dual channel detector 30 are disposed on the mount 60. The concave mirror 40 is disposed at the second end 53 of the mounting tube 50. Through setting up mount pad 60 to set up light source mounting hole 62 and detector mounting hole 64 simultaneously on mount pad 60, with be used for installing light source 10 and binary channels detector 30, can make the structure compacter, and can fix light source 10 and binary channels detector 30 simultaneously through an component, and then reduced the quantity of component, and also reduced the installation complexity, be convenient for installation and dismantlement. By providing the mounting tube 50, the light source 10, the concave reflecting mirror 40, and the dual-channel detector 30 can be integrated, which facilitates mounting.

Further, as shown in fig. 2 and 6, the mounting base 60 is provided with a light source mounting hole 62 and a detector mounting hole 64, the light source 10 is assembled in the light source mounting hole 62, the dual-channel detector 30 is assembled in the detector mounting hole 64, and the axis of the light source mounting hole 62 and the axis of the detector mounting hole 64 are symmetrically arranged with respect to the axis of the mounting tube 50, so that the light focused by the concave reflector 40 can vertically enter the dual-channel detector 30, and further the utilization rate of light energy is improved.

Alternatively, in the present embodiment, as shown in fig. 2 and 5, the mounting tube 50 includes a mounting portion 52 and a tube body portion 54, the tube body portion 54 is disposed in a hollow manner and is connected to one side of the mounting portion 52, a mounting groove 522 is disposed on a surface of the mounting portion 52 away from the tube body portion 54, the mounting seat 60 is accommodated in the mounting groove 522, the light source 10 and the dual-channel detector 30 are fixed on the mounting seat 60, and the concave reflector 40 is disposed on one side of the tube body portion 54 away from the mounting portion 52. The bottom of the mounting groove 522 is provided with an avoiding hole 524 for communicating the mounting groove 522 with the inside of the barrel 54, light emitted from the light source 10 enters the concave reflector 40 through the avoiding hole 524, and the light condensed and reflected by the concave reflector 40 enters the dual-channel detector 30 through the avoiding hole 524.

Further, as shown in fig. 2 and 8, a detection chamber 55 is formed in the barrel 54, and the gas concentration detection apparatus 100 with a mounting seat further includes an isolation mirror 80, where the isolation mirror 80 is clamped between the bottom wall of the mounting groove 522 and the mounting seat 60, and is used for covering the avoiding hole 524 to isolate the detection chamber 55 from the mounting groove 522. This embodiment is used for keeping apart the isolation mirror 80 that detects chamber 55 and mounting groove 522 through the setting, can prevent to be located the gas entering mounting groove 522 in detecting chamber 55, avoids the gaseous electrical part that contacts light source 10 and binary channels detector 30 that awaits measuring, and explodes, and then promotes the security performance of the gas concentration detection device 100 who has the mount pad.

Referring to fig. 10, fig. 10 is a schematic flow chart illustrating a gas concentration detection method according to an embodiment of the present invention. The utility model also provides a gas concentration detection method, include:

s201: controlling the light source 10 to periodically emit light;

s202: controlling the concave reflector 40 to focus and reflect the emergent light of the light source 10 to the dual-channel detector 30, wherein the dual-channel detector 30 comprises a detection channel and a reference channel, the detection channel is used for detecting the first light intensity of the first wavelength light absorbed by the gas, and the reference channel is used for detecting the second light intensity of the second wavelength light not absorbed by the gas;

s203: and responding to the corresponding relation between the ratio of the first light intensity and the second light intensity and the concentration of the gas to be measured, and obtaining the concentration of the gas to be measured.

In the present embodiment, the light source 10 has a light emitting frequency of 1 to 10 HZ. For example, 1HZ, 2HZ, 3HZ, 4HZ, 5HZ, 6HZ, 7HZ, 8HZ, 9HZ, or 10HZ may be used. Can set up according to the gaseous kind of awaiting measuring and the gaseous concentration of awaiting measuring, the embodiment of the utility model provides a do not specifically prescribe a limit.

Under the same action distance of light and gas, the light intensity differential signal change of the dual-channel detector 30 increases along with the increase of the gas concentration, so that a mathematical relation curve corresponding to the gas concentration and the detector light intensity differential signal one to one is established, the gas concentration sensing measurement is realized, and the dual-channel detector 30 is formed. Meanwhile, the integrated dual-channel detector 30 is used for simultaneously detecting the first wavelength light and the second wavelength light, so that the first wavelength light and the second wavelength light have the same source and propagation path, and the light intensity disturbance caused by the external environment, reflection scattering and the like is the same as the light loss, so that the light intensity disturbance caused by the light source intensity fluctuation and the propagation loss can be effectively eliminated by utilizing the differential signal processing of the first wavelength light and the second wavelength light, and the detection precision of the gas concentration detection device 100 with the mounting seat is improved.

The above is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. The utility model provides a gas concentration detection device with mount pad, a serial communication port, gas concentration detection device with mount pad includes light source, concave surface speculum, binary channels detector and mount pad, light source mounting hole and detector mounting hole have been seted up on the mount pad, the light source assemble in the light source mounting hole, the binary channels detector assemble in the detector mounting hole, the concave surface speculum with the mount pad sets up relatively, the light that the light source sent shine to the concave surface speculum, the concave surface speculum assemble and reflect light extremely the binary channels detector.

2. The gas concentration detecting apparatus with a mounting base according to claim 1, further comprising a mounting cylinder having a first end and a second end disposed opposite to each other, wherein the mounting base is connected to the first end of the mounting cylinder, the concave reflecting mirror is disposed at the second end of the mounting cylinder, and an axis of the light source mounting hole and an axis of the detector mounting hole are disposed obliquely to the axis of the mounting cylinder.

3. The gas concentration detection apparatus having a mount according to claim 2, wherein an axis of the light source mounting hole and an axis of the detector mounting hole are provided symmetrically with respect to an axis of the mount cylinder.

4. The gas concentration detecting device with the mounting seat according to claim 2, wherein the mounting cylinder includes a mounting portion and a cylinder portion, the cylinder portion is hollow and connected to one side of the mounting portion, a mounting groove is formed in a surface of the mounting portion away from the cylinder portion, the mounting seat is accommodated in the mounting groove, and the concave reflecting mirror is disposed on one side of the cylinder portion away from the mounting portion; the intercommunication has been seted up to the bottom of mounting groove the mounting groove with the inside hole of dodging of barrel portion, the light that the light source sent passes through the hole of dodging incides the concave surface speculum, the reflection light of concave surface speculum is incided through the hole of dodging the binary channels detector.

5. The gas concentration detection device with the mounting seat according to claim 4, wherein the mounting groove is a stepped groove, the stepped groove includes a first groove and a second groove which are nested, the avoiding hole is located on a bottom surface of the first groove, the mounting seat includes a fixing portion and a connecting portion, the light source mounting hole and the detector mounting hole are disposed on the fixing portion, the fixing portion is accommodated in the first groove, and the connecting portion is fixedly connected with a bottom surface of the second groove.

6. The gas concentration detection apparatus having a mount according to claim 5, wherein the mounting groove is a circular groove, the connection portion is annular, and the annular connection portions are provided on opposite sides of the fixing portion.

7. The gas concentration detection apparatus with the mounting base according to claim 1, wherein the gas concentration detection apparatus with the mounting base further comprises an adaptive reflector, the adaptive reflector is mounted in the light source mounting hole, a light reflecting groove is formed on a surface of the adaptive reflector, a side wall of the light reflecting groove forms a light reflecting surface, and the light source is mounted in the center of the light reflecting groove.

8. The gas concentration detection apparatus with the mounting seat according to claim 1, wherein a hole wall of the detector mounting hole and an outer wall of the dual-channel detector are respectively provided with a limiting groove and a limiting column which are matched with each other.

9. The gas concentration detection apparatus having a mounting seat according to claim 1, wherein a fixing hole is opened in the mounting seat, and the gas concentration detection apparatus having a mounting seat further includes a temperature sensor disposed in the fixing hole.

10. A combustible gas alarm device, comprising an alarm and the gas concentration detection device with a mounting seat according to any one of claims 1 to 9, wherein the alarm is electrically connected with the gas concentration detection device with a mounting seat and is used for giving out an alarm sound when the gas concentration detection device with a mounting seat detects that the concentration of the combustible gas is greater than a preset value.