CN107478557B - Detection device of dust concentration detector - Google Patents
Detection device of dust concentration detector Download PDFInfo
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- CN107478557B CN107478557B CN201710860299.1A CN201710860299A CN107478557B CN 107478557 B CN107478557 B CN 107478557B CN 201710860299 A CN201710860299 A CN 201710860299A CN 107478557 B CN107478557 B CN 107478557B
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- 239000000428 dust Substances 0.000 title claims abstract description 98
- 238000001514 detection method Methods 0.000 title claims abstract description 88
- 239000013307 optical fiber Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 8
- 230000002146 bilateral effect Effects 0.000 claims description 5
- 238000007664 blowing Methods 0.000 abstract description 22
- 238000009434 installation Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000000149 argon plasma sintering Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000009795 derivation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a detection device of a dust concentration detector, which comprises a lower bottom plate, a chamber body and an upper cover plate, wherein a detection chamber is arranged on the chamber body, a dust guide sleeve is arranged at an upper opening, a light emitting channel and a light receiving channel are arranged on the chamber body, a light source and a light inlet convex lens are arranged on the light emitting channel, a light outlet convex lens and a receiver are arranged on the light receiving channel, a first blowing channel and a second blowing channel are arranged on the chamber body, the first blowing channel and the second blowing channel are respectively aligned to one side surfaces of the light inlet convex lens and the light outlet convex lens, a first pipe joint and a second pipe joint are arranged on the upper cover plate, and the first pipe joint and the second pipe joint are respectively communicated with the first blowing channel and the second blowing channel. The detection device can effectively protect the light-in convex lens and the light-out convex lens, avoid dust from adhering to the surfaces of the light-in convex lens and the light-out convex lens, and improve the detection precision.
Description
Technical Field
The present disclosure relates to detection devices, and particularly to a detection device for a dust concentration detector.
Background
The dust concentration detection system is used for measuring the concentration of dust or particles in an open space, and can be widely applied to online real-time dust concentration monitoring of workshops, working environments, working spaces, offices, outdoor spaces and the like in various industries, and dust concentration monitoring of special industrial working environments such as mines, underground coal mines and the like. However, the concentration of the particles in the urban rail transit place also needs to be detected online, because the urban rail transit place has large flow of people, dust on the ground can be raised, the subway operation can also generate some metal particles, and the too high concentration of the particles can cause harm to human bodies. The main principle of the existing dust concentration detector is to detect by adopting a light scattering principle, for example, the patent number is as follows: 201010294093.5 discloses that dust concentration is detected by the principle of light scattering, light rays are reflected when encountering dust, and then reflected by a spherical reflector and then received by a photoelectric detector (receiver), and optical signals are converted into electric signals so as to reflect the dust concentration. The dust concentration detector is connected with a sampling pump as the power of dust-containing gas. However, the detection devices of dust concentration detectors of the light scattering principle used at present have the following disadvantages: 1. the spherical reflector inside the dust concentration detection instrument used at present is easy to adhere to dust particles after long-time use, so that the reflection effect of the spherical reflector is affected, and the accuracy of a detection result is affected; 2. the flow route of dust-containing gas of the existing instrument detection device is unreasonable, and the flow channel of the dust-containing gas is long and bent, so that dust is easy to adhere in the channel, and the detection result of the dust is inaccurate; 3. the current detection device is carried out by the principle of light scattering, light generated by a light source enters a detection cavity and is received by a receiver after being scattered by dust, the current detection cavity is simple in structure and is only a cylindrical cavity, and a laser light source emits laser from the left side. The laser beam is reflected by the spherical reflecting mirror and then is converged into the monitoring range of the photoelectric detector, and the reflected light of the spherical reflecting mirror can be monitored after penetrating through the flowing area of the dust, so that the reflected light can be shielded by the dust, and the monitoring result is inaccurate.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the detection device of the dust concentration detector can effectively protect the light-in convex lens and the light-out convex lens, prevent dust from adhering to the surfaces of the light-in convex lens and the light-out convex lens, and improve detection precision.
In order to solve the technical problems, the technical scheme of the invention is as follows: the detection device of the dust concentration detector comprises a lower bottom plate, a chamber body and an upper cover plate, wherein the lower bottom plate and the upper cover plate are respectively fixed at the upper end and the lower end of the chamber body, a detection chamber is arranged on the chamber body, an upper opening and a lower opening which are communicated with the detection chamber are respectively arranged on the upper cover plate and the lower bottom plate, the lower opening is positioned vertically below the upper opening, a dust guide sleeve is arranged at the upper opening of the upper cover plate, and a guide channel for vertically guiding dust into the detection chamber is arranged on the dust guide sleeve; the cavity body is provided with a light emitting channel and a light receiving channel which extend horizontally, and the light emitting channel and the light receiving channel are communicated with the detection cavity and intersect to form an included angle; the light emitting device comprises a cavity body, a light receiving channel, a light source, a light emitting convex lens, a light receiving channel, a light source, a light receiving channel, a first pipe joint, a second pipe joint, a first pipe joint and a second pipe joint, wherein the light source and the light emitting convex lens are arranged on the light emitting channel, the light emitting convex lens and the light receiving channel are arranged on the light receiving channel, the light emitting convex lens and the light emitting convex lens are closer to a detection cavity than the light source and the light emitting convex lens, the cavity body is provided with a first injection channel communicated with the light emitting channel, the first injection channel is aligned with one side surface of the light emitting convex lens, which is close to the detection cavity, the second injection channel is communicated with the light receiving channel, the second injection channel is aligned with one side surface of the light emitting convex lens, which is close to the detection cavity, and the upper cover plate is provided with the first pipe joint and the second pipe joint communicated with the first injection channel and the second injection channel respectively.
As a preferable scheme, the detection chamber is of a symmetrical structure, the detection chamber comprises a left chamber and a right chamber which are symmetrical left and right relative to a vertical symmetry plane, the vertical center line of the diversion channel is positioned on the vertical symmetry plane, the light emitting channel is communicated with the right chamber, and the light receiving channel is communicated with the left chamber.
As a preferable scheme, the left chamber is a first left side wall, a second left side wall, a third left side wall, a fourth left side wall and a fifth left side wall which are sequentially connected, the first left side wall and the second left side wall are vertical, the second left side wall is vertical to the extending direction of the light receiving channel and forms an obtuse angle with the third left side wall, the third left side wall and the fourth left side wall are vertical, the fifth left side wall and the fourth left side wall are vertical and are parallel to the third left side wall, the shape of the right chamber is symmetrical to the shape of the left chamber and comprises a first right side wall, a second right side wall, a third right side wall, a fourth right side wall and a fifth right side wall, the fifth left side wall and the fifth right side wall are coplanar and are connected, the junction of first left side wall and first right side wall is provided with the middle reflection plane, and this middle reflection plane is perpendicular with vertical symmetry face, the junction of fifth left side wall and fifth right side wall is provided with middle reflection arch, is provided with left middle reflection inclined plane and right middle reflection inclined plane that bilateral symmetry set up on this middle reflection arch, be provided with left side reflection arch and the right side reflection arch of mutual bilateral symmetry on second left side wall and the second right side wall respectively, left side reflection arch and right side reflection protruding structure are the same, and left side reflection arch includes first left side plane and second left side plane, and this first left side plane is parallel with the light receiving passageway, and the second left side plane is parallel with fifth left side wall.
As a preferable scheme, the dust flow guiding sleeve is detachably fixed on the upper cover plate, the flow guiding channel sequentially comprises a connecting channel section, a diameter-reduced channel section and a guiding-out channel section from top to bottom, the large diameter end of the diameter-reduced channel end is connected with the connecting channel section, and the guiding-out channel section is connected with the small diameter end of the diameter-reduced channel section.
As a preferable scheme, the diameter-reducing channel section comprises a primary diameter-reducing channel section, a transitional connecting section and a secondary diameter-reducing channel section, wherein the axial contour line of the primary diameter-reducing channel section is an arc-shaped contracted contour line, the transitional connecting section is respectively connected with the small diameter end of the primary diameter-reducing channel section and the large diameter end of the secondary diameter-reducing channel, and the secondary diameter-reducing channel section is a conical diameter-reducing channel section.
As a preferred embodiment, the outlet opening of the outlet channel section extends downward and into the detection chamber.
As a preferable scheme, the chamber body is provided with a light intensity detection channel which is communicated with the light emission channel, and a light intensity detection sensor is detachably arranged in the light intensity detection channel.
As a preferable scheme, an installation step is arranged in the light receiving channel, the light emitting convex lens is installed in the light receiving channel and is in positioning contact with the installation step on the side surface, a jacking screw sleeve for jacking the other side of the light emitting convex lens is installed in the light receiving channel through threads, and a receiver and a shielding device are installed at the tail end of the light receiving channel.
As a preferred solution, the chamber body is further provided with a span calibration device for calibrating the detection device.
As a preferred solution, the span calibration device comprises two structural forms; a span calibration device comprises a span calibration channel arranged on a chamber body, wherein the span calibration channel is communicated with a light receiving channel, and a span calibration light source capable of adjusting light intensity is arranged in the span calibration channel;
another span alignment device comprises an optical fiber communicating between a light emitting channel and a light receiving channel, the optical fiber conducting light emitted by a light source to a receiver in the light receiving channel, the optical fiber having an optical switch disposed thereon.
After the technical scheme is adopted, the invention has the following effects: 1. the dust concentration detector comprises a chamber body, wherein a detection chamber is arranged on the chamber body, an upper opening and a lower opening which are communicated with the detection chamber are respectively arranged on an upper cover plate and a lower bottom plate, the lower opening is positioned vertically under the upper opening, a dust guide sleeve is arranged at the upper opening of the upper cover plate, the flowing power of dust-containing gas is provided for a sampling pump of the dust concentration detector, so that the dust-containing gas directly vertically enters the detection chamber from the dust guide sleeve and flows out from the lower opening, the flowing route of dust is short, the dust is not easy to adhere, and the loss of dust in the detection process is avoided; 2. the cavity body is provided with a light emitting channel and a light receiving channel which extend horizontally, and the light emitting channel and the light receiving channel are communicated with the detection cavity and intersect to form an included angle; the light emission channel is provided with a light source and a light inlet convex lens, the light receiving channel is provided with a light outlet convex lens and a receiver, and the light inlet convex lens and the light outlet convex lens are closer to the detection cavity than the light source and the receiver, so that the light emitted by the light source is dispersed to a dust flow area in the detection cavity through the light inlet convex lens, and the light is conveniently dispersed to cover the whole dust flow area; meanwhile, the light enters the light receiving channel after being refracted by dust and then is condensed by the light-emitting convex lens, so that the light signal of the receiver is more convenient to receive; 3. the cavity body is provided with a first blowing channel communicated with the light emission channel, the first blowing channel is aligned with one side surface of the light-in convex lens, which is close to the detection cavity, the cavity body is provided with a second blowing channel communicated with the light-receiving channel, the second blowing channel is aligned with one side surface of the light-out convex lens, which is close to the detection cavity, the upper cover plate is provided with a first pipe joint and a second pipe joint which are communicated with a zero gas supply system, and the first pipe joint and the second pipe joint are respectively communicated with the first blowing channel and the second blowing channel, so that the light-in convex lens and the light-out convex lens can be blown by the first blowing channel and the second blowing channel, dust can be prevented from adhering to the surfaces of the light-in convex lens and the light-out convex lens due to the fact that the blown gas is zero gas (the gas without dust), and the accuracy of a detection result is improved.
The left cavity is provided with a first left side wall, a second left side wall, a third left side wall, a fourth left side wall and a fifth left side wall which are sequentially connected, the first left side wall is vertical to the second left side wall, the second left side wall is vertical to the extending direction of the light receiving channel and forms an obtuse angle with the third left side wall, the third left side wall is vertical to the fourth left side wall, the fifth left side wall is vertical to the fourth left side wall and is parallel to the third left side wall, the shape of the right cavity is symmetrical to the shape of the left cavity and comprises a first right side wall, a second right side wall, a third right side wall, a fourth right side wall and a fifth left side wall, the fifth left side wall and the fifth right side wall are coplanar and are connected, an intermediate reflection plane is arranged at the joint of the first left side wall and the first right side wall and is vertical to the vertical symmetry plane, the connection part of the fifth left side wall and the fifth right side wall is provided with a middle reflecting bulge, the middle reflecting bulge is provided with a left middle reflecting inclined plane and a right middle reflecting inclined plane which are arranged in bilateral symmetry, the second left side wall and the second right side wall are respectively provided with a left reflecting bulge and a right reflecting bulge which are mutually symmetrical in bilateral symmetry, the left reflecting bulge and the right reflecting bulge have the same structure, the left reflecting bulge comprises a first left plane and a second left plane, the first left plane is parallel to the light receiving channel, the second left plane is parallel to the fifth left side wall, therefore, the detection chamber has reasonable structure, the light passing through dust is reflected by the middle reflecting bulge, the left reflecting bulge, the right reflecting bulge and the middle reflecting plane, the light intensity of the light can be gradually weakened through the reflecting bulge and the reflecting plane to achieve the extinction purpose, meanwhile, unnecessary light enters the left cavity and the right cavity which are bilaterally symmetrical after being reflected so as to effectively form a light trap, and the light which is not scattered by dust is prevented from being received by the receiver.
Because the dust water conservancy diversion cover can be dismantled and fixed on the upper cover plate, the water conservancy diversion passageway from top to bottom includes connecting channel section, reducing passageway section and derivation passageway section in order, the major diameter end and the connecting channel section of reducing passageway end are connected, the derivation passageway section is connected with the minor diameter end of reducing passageway section, dust gas can concentrate after the reducing passageway section like this, make dust distribution more even, then enter into the detection cavity through the derivation passageway section, the volume increases suddenly, the dust flows the loss more even in the dust flow region of detection cavity like this, make the testing result more accurate, and utilize the connecting channel section can conveniently connect other parts, such as dust cutterbar, thereby the dust concentration of different particle diameters of detection that can be selective.
The diameter-reducing channel section comprises a primary diameter-reducing channel section, a transitional connecting section and a secondary diameter-reducing channel section, wherein the axial contour line of the primary diameter-reducing channel section is an arc-shaped contracted contour line, the transitional connecting section is respectively connected with the small diameter end of the primary diameter-reducing channel section and the large diameter end of the secondary diameter-reducing channel, and the secondary diameter-reducing channel section is a conical diameter-reducing channel section.
And because the export of export passageway section downwardly extending just stretches into and detects the cavity and lie in the upper edge top of light receiving passageway, export the dust of passageway section like this and the mouth is nearer down, and dusty gas is derived from the mouth down more easily, makes the testing result of dust more accurate, avoids the diffusion volume of dust in the monitoring cavity, avoids the dust to be by secondary reflection.
And because the cavity body is provided with the light intensity detection channel which is communicated with the light emission channel, the light intensity detection sensor is detachably arranged in the light intensity detection channel, the luminous intensity of the light source can be detected by utilizing the light intensity detection sensor, and the light intensity of the light source can be adjusted to a proper value, so that the light intensity detection device is convenient for a receiver to accurately receive.
And because the installation step is arranged in the light receiving channel, the light emitting convex lens is installed in the light receiving channel and the side surface of the light emitting convex lens is in positioning contact with the installation step, the internal thread of the light receiving channel is provided with the jacking screw sleeve for jacking the other side of the light emitting convex lens, the tail end of the light receiving channel is provided with the receiver and the shielding device, the installation of the light emitting convex lens is simple, the receiving precision and the accuracy of the receiver can be higher by utilizing the shielding device, and the interference of external signals is avoided.
And because the span calibration device comprises two structural forms; a span calibration device comprises a span calibration channel arranged on a chamber body, wherein the span calibration channel is communicated with a light receiving channel, and a span calibration light source capable of adjusting light intensity is arranged in the span calibration channel; the other span calibrating device comprises an optical fiber which is communicated between the light emitting channel and the light receiving channel, the optical fiber conducts the light emitted by the light source to a receiver in the light receiving channel, and an optical switch is arranged on the optical fiber, so that the sensitivity of the receiver can be detected by using the two span calibrating devices, the sensitivity and the accuracy of each value of the receiver in the range can be calibrated by adjusting the light intensity of the span calibrating light source and comparing the light intensity with the received light intensity of the absolute receiver, of course, the other scheme can conduct the light source in the light emitting channel to the light receiving channel through the optical fiber and directly receive the light source by the receiver and switch the light source through the optical switch, the optical fiber is in a closed state during normal use, and the optical switch is opened only when the span calibration is needed, and the sensitivity and the accuracy of each value in the range of the receiver can be calibrated.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 is a schematic perspective view of another angle of an embodiment of the present invention;
FIG. 3 is a top view, partially in section, of a belt of an embodiment of the present invention;
FIG. 4 is a rotational cross-sectional view at A-A of FIG. 3;
FIG. 5 is a perspective view of the chamber body;
FIG. 6 is a top view of the chamber body;
FIG. 7 is a top view of a span calibration device with one configuration in accordance with an embodiment of the present invention;
FIG. 8 is a top view of a span calibration device with another configuration in accordance with an embodiment of the present invention;
in the accompanying drawings: 1. a lower base plate; 2. a chamber body; 211. a first left side wall; 212. a second left side wall; 213. a third left side wall; 214. a fourth left side wall; 215. a fifth left side wall; 216. a middle reflective protrusion; 217. left reflecting protrusion; 218. a middle reflection plane; 221. a first right side wall; 222. a second right side wall; 223. a third right side wall; 224. a fourth right side wall; 225. a fifth right and left side wall; 226. a right reflecting protrusion; 3. an upper cover plate; 4. a dust guide sleeve; 5. a first pipe joint; 6. a second pipe joint; 7. a shield; 8. a light intensity detection sensor; 9. a light intensity detection channel; 10. a light emission channel; 11. a light source; 12. a light-entering convex lens; 13. a detection chamber; 14. a light receiving channel; 15. a light-emitting convex lens; 16. pressing the screw sleeve; 17. a receiver; 18. a second blowing channel; 19. a first blowing channel; 20. span calibration channels; 21. a span-calibrated light source; 22. an optical fiber; 23. an optical switch.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
The left and right sides of the chamber body 2 are determined according to the arrangement mode of fig. 6.
As shown in fig. 1 to 6, a detection device of a dust concentration detector comprises a lower base plate 1, a chamber body 2 and an upper cover plate 3, wherein the lower base plate 1, the chamber body 2 and the upper cover plate 3 are all made of metal materials; the lower bottom plate 1 and the upper cover plate 3 are respectively fixed at the upper end and the lower end of the chamber body 2 through screws, a detection chamber 13 is arranged on the chamber body 2, an upper opening and a lower opening which are communicated with the detection chamber 13 are respectively arranged on the upper cover plate 3 and the lower bottom plate 1, the lower opening is positioned vertically under the upper opening, a dust guide sleeve 4 is arranged at the upper opening of the upper cover plate 3, and a guide channel for vertically guiding dust into the detection chamber 13 is arranged on the dust guide sleeve 4; the lower port of the dust concentration detector is communicated with the suction port of the sampling pump, and the sampling pump generates suction force to enable dust-containing gas to enter the detection chamber 13 from the dust guide sleeve 4.
The chamber body 2 is provided with a light emitting channel 10 and a light receiving channel 14 which extend horizontally, and the light emitting channel 10 and the light receiving channel 14 are communicated with the detection chamber 13 and intersect to form an included angle; the preferred included angle in this embodiment is 100-110; the light emission channel 10 is provided with a light source 11 and a light-in convex lens 12, the light receiving channel 14 is provided with a light-out convex lens 15 and a receiver 17, the light-in convex lens 12 and the light-out convex lens 15 are closer to the detection cavity 13 than the light source 11 and the receiver 17, the receiver 17 is a photoelectric conversion device commonly used in dust concentration detectors, and a photodiode is adopted, such as a photoelectric detector disclosed in patent number 201010294093.5. The light source 11 is similar to the point light source 11, and the laser light source 11 is adopted, so that the light generated by the point light source 11 is diffused by the light-entering convex lens 12, so that the diffused light covers the whole dust flow area, and the dust flow area is actually a vertical flow area between the diversion channel and the lower opening. And the light scattered by the dust is collected by the light-emitting convex lens 15, so that the light is more convenient for the receiver 17 to accurately receive. The detection mode has smaller error and higher accuracy than the mode of 201010294093.5.
As shown in fig. 1 and 4, the chamber body 2 is provided with a first blowing channel 19 communicated with the light emitting channel 10, the first blowing channel 19 is aligned with one side surface of the light inlet convex lens 12 near the detection chamber 13, the chamber body 2 is provided with a second blowing channel 18 communicated with the light receiving channel 14, the second blowing channel 18 is aligned with one side surface of the light outlet convex lens 15 near the detection chamber 13, the upper cover plate 3 is provided with a first pipe joint 5 and a second pipe joint 6 communicated with a zero gas supply system, and the first pipe joint 5 and the second pipe joint 6 are respectively communicated with the first blowing channel 19 and the second blowing channel 18. In actual use, the zero gas supply system can be the gas discharged by the sampling pump of the dust concentration detector, the dust flowing out of the lower opening of the dust concentration detector can be filtered by the filter membrane to form zero gas, and the sampling pump can send part of the zero gas into the first pipe joint 5 and the second pipe joint 6. Of course, the zero gas supply system may also be a separate supply system.
As shown in fig. 5 and 6, the detecting chamber 13 has a symmetrical structure, the detecting chamber 13 includes a left chamber and a right chamber which are symmetrical left and right with respect to a vertical symmetry plane, a vertical center line of the flow guiding channel is located on the vertical symmetry plane, the light emitting channel 10 is communicated with the right chamber, and the light receiving channel 14 is communicated with the left chamber. The first left side wall 211, the second left side wall 212, the third left side wall 213, the fourth left side wall 214 and the fifth left side wall 215 which are sequentially connected with each other in the left cavity, the first left side wall 211 and the second left side wall 212 are perpendicular, an included angle between the second left side wall 212 and the third left side wall 213 is an obtuse angle, the third left side wall 213 and the fourth left side wall 214 are perpendicular, the fifth left side wall 215 and the fourth left side wall 214 are perpendicular and are parallel to the third left side wall 213, the shape of the right cavity is symmetrical to the shape of the left cavity and comprises a first right side wall 221, a second right side wall 222, a third right side wall 223, a fourth right side wall 224 and a fifth right side wall 225, a middle reflection plane 218 is arranged at the joint of the first left side wall 211 and the first right side wall 221, the middle reflection plane 218 is perpendicular to the vertical symmetry plane, a middle reflection bulge 216 is arranged at the joint of the fifth left side wall 213 and the fifth left side wall 215, a middle reflection bulge 216 is arranged at the joint of the fifth left side wall 215 and the fifth left side wall 215, the middle reflection plane 226 is parallel to the second left side wall 217, the middle reflection plane is parallel to the second left side wall and the middle reflection plane is parallel to the fifth left side wall 215, the middle reflection plane is parallel to the fifth left side wall and the fifth left side wall 215 and the middle reflection plane.
The dust flow guiding sleeve 4 is detachably fixed on the upper cover plate 3, the flow guiding channel sequentially comprises a connecting channel section, a diameter reducing channel section and a guiding-out channel section from top to bottom, the large diameter end of the diameter reducing channel end is connected with the connecting channel section, and the guiding-out channel section is connected with the small diameter end of the diameter reducing channel section. The diameter-reducing channel section comprises a primary diameter-reducing channel section, a transitional connection section and a secondary diameter-reducing channel section, wherein the axial contour line of the primary diameter-reducing channel section is an arc diameter-reducing contour line, the transitional connection section is respectively connected with the small diameter end of the primary diameter-reducing channel section and the large diameter end of the secondary diameter-reducing channel, and the secondary diameter-reducing channel section is a conical diameter-reducing channel section. The outlet opening of the outlet channel section extends downwards and into the detection chamber 13. And the lower opening is provided with an air outlet nozzle which also extends upwards into the detection chamber 13, so that the dust circulation path is shortened, and the dust dissipation is further avoided.
The chamber body 2 is provided with a light intensity detection channel 9, the light intensity detection channel 9 is communicated with a light emission channel 10, and a light intensity detection sensor 8 is detachably arranged in the light intensity detection channel 9. The light receiving channel 14 is internally provided with an installation step, the light emergent convex lens 15 is installed in the light receiving channel 14, the side surface of the light emergent convex lens is in positioning contact with the installation step, the internal thread of the light receiving channel 14 is provided with a jacking screw sleeve 16 jacking the other side of the light emergent convex lens 15, and the tail end of the light receiving channel 14 is provided with a receiver 17 and a shielding device 7. The light-entering convex lens 12 is installed in the light-emitting channel 10 in the same manner as described above.
Fig. 7 and 8 add span calibration means to the system of fig. 3 to detect the sensitivity of the receiver to various values over the range of measurement, as shown in fig. 7 and 8. And the chamber body is also provided with a span calibrating device for calibrating the detecting device.
As shown in fig. 7, the span calibration device includes two structural forms; a span calibrating device comprises a span calibrating channel 20 arranged on a chamber body, wherein a span calibrating light source 21 capable of adjusting light intensity is arranged in the span calibrating channel 20; when the span calibration is carried out, the span calibration light source 21 is directly turned on, and the light source in the light emission channel is turned off, so that the span calibration light source 21 emits light intensities with different intensities, and the light intensities with different intensities are received by the receiver.
Similarly, as shown in fig. 8, another span calibrating device includes an optical fiber 22 communicating between a light emitting channel and a light receiving channel, the optical fiber 22 conducting light emitted from a light source to a receiver in the light receiving channel, and an optical switch 23 is provided on the optical fiber 22. This configuration uses a light source that directs light generated by the light source through the optical fiber 22 into the light receiving channel and into the receiver, again allowing span calibration.
The dust monitoring principle in the invention is the same as the principle of patent number 201010294093.5, and light reflection is adopted to convert light signals into electric signals so as to reflect dust concentration, which is also the principle of on-line detection of the dust concentration commonly used at present, and the dust monitoring principle is not described in detail in the application.
The above examples are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and adaptations of the technical solution of the present invention should and are intended to fall within the scope of the present invention as defined in the claims.
Claims (10)
1. The utility model provides a detection device of dust concentration detector which characterized in that: the dust collection device comprises a lower bottom plate, a chamber body and an upper cover plate, wherein the lower bottom plate and the upper cover plate are respectively fixed at the upper end and the lower end of the chamber body, a detection chamber is arranged on the chamber body, an upper opening and a lower opening which are communicated with the detection chamber are respectively arranged on the upper cover plate and the lower bottom plate, the lower opening is positioned vertically under the upper opening, a dust guide sleeve is arranged at the upper opening of the upper cover plate, and a guide channel for vertically guiding dust into the detection chamber is arranged on the dust guide sleeve; the cavity body is provided with a light emitting channel and a light receiving channel which extend horizontally, and the light emitting channel and the light receiving channel are communicated with the detection cavity and intersect to form an included angle; the light emitting device comprises a cavity body, a light receiving channel, a light source, a light emitting convex lens, a light receiving channel, a light source, a light receiving channel, a first pipe joint, a second pipe joint, a first pipe joint and a second pipe joint, wherein the light source and the light emitting convex lens are arranged on the light emitting channel, the light emitting convex lens and the light receiving channel are arranged on the light receiving channel, the light emitting convex lens and the light emitting convex lens are closer to a detection cavity than the light source and the light emitting convex lens, the cavity body is provided with a first injection channel communicated with the light emitting channel, the first injection channel is aligned with one side surface of the light emitting convex lens, which is close to the detection cavity, the second injection channel is communicated with the light receiving channel, the second injection channel is aligned with one side surface of the light emitting convex lens, which is close to the detection cavity, and the upper cover plate is provided with the first pipe joint and the second pipe joint communicated with the first injection channel and the second injection channel respectively.
2. The detecting device for a dust concentration detector according to claim 1, wherein: the detection chamber is of a symmetrical structure, the detection chamber comprises a left chamber and a right chamber which are symmetrical left and right relative to a vertical symmetry plane, the vertical center line of the flow guide channel is positioned on the vertical symmetry plane, the light emitting channel is communicated with the right chamber, and the light receiving channel is communicated with the left chamber.
3. The detecting device for a dust concentration detector according to claim 2, wherein: the light receiving device comprises a left cavity, a first left side wall, a second left side wall, a third left side wall, a fourth left side wall and a fifth left side wall, wherein the first left side wall, the second left side wall, the third left side wall, the fourth left side wall and the fifth left side wall are sequentially connected, the second left side wall is perpendicular to the extending direction of the light receiving channel, an included angle between the second left side wall and the third left side wall is an obtuse angle, the third left side wall and the fourth left side wall are perpendicular to the fifth left side wall, the fifth left side wall and the fourth left side wall are perpendicular to the third left side wall and are parallel to the third left side wall, the shape of the right cavity is symmetrical to the shape of the left cavity and comprises a first right side wall, a second right side wall, a third right side wall, a fourth right side wall and a fifth left side wall, the fifth left side wall and the fifth left side wall are coplanar and are connected, an intermediate reflection plane is arranged at the connection of the first left side wall and the first right side wall, the intermediate reflection plane is perpendicular to the vertical symmetry plane, an intermediate reflection bulge is arranged at the connection of the fifth left side wall and the fifth left side wall, a left intermediate reflection inclined plane and an intermediate reflection plane are arranged on the intermediate reflection bulge which are in bilateral symmetry, the left side and the right side, the second left side wall and the right side bulge is arranged on the second left side and the right side plane is parallel to the plane, and the plane is opposite to the plane, and the plane is arranged on the first left side and the bulge.
4. A detection apparatus of a dust concentration detector according to any one of claims 1 to 3, characterized in that: the dust flow guide sleeve is detachably fixed on the upper cover plate, the flow guide channel sequentially comprises a connecting channel section, a diameter reduction channel section and a guiding-out channel section from top to bottom, the large diameter end of the diameter reduction channel section is connected with the connecting channel section, and the guiding-out channel section is connected with the small diameter end of the diameter reduction channel section.
5. The detecting device for a dust concentration detecting instrument according to claim 4, wherein: the diameter-reducing channel section comprises a primary diameter-reducing channel section, a transitional connection section and a secondary diameter-reducing channel section, wherein the axial contour line of the primary diameter-reducing channel section is an arc diameter-reducing contour line, the transitional connection section is respectively connected with the small diameter end of the primary diameter-reducing channel section and the large diameter end of the secondary diameter-reducing channel, and the secondary diameter-reducing channel section is a conical diameter-reducing channel section.
6. The detecting device for a dust concentration detecting instrument according to claim 5, wherein: the outlet of the outlet channel section extends downwards and into the detection chamber.
7. The detecting device for a dust concentration detecting instrument according to claim 6, wherein: the chamber body is provided with a light intensity detection channel which is communicated with the light emission channel, and a light intensity detection sensor is detachably arranged in the light intensity detection channel.
8. The detecting device for a dust concentration detecting instrument according to claim 7, wherein: the light receiving channel is internally provided with a mounting step, the light emitting convex lens is mounted in the light receiving channel, the side surface of the light emitting convex lens is in positioning contact with the mounting step, the light receiving channel is internally provided with a jacking screw sleeve for jacking the other side of the light emitting convex lens, and the tail end of the light receiving channel is provided with a receiver and a shielding device.
9. The detecting device for a dust concentration detecting instrument according to claim 8, wherein: and the chamber body is also provided with a span calibrating device for calibrating the detecting device.
10. The detecting device for a dust concentration detecting instrument according to claim 9, wherein: the span calibration device comprises two structural forms;
a span calibration device comprises a span calibration channel arranged on a chamber body, wherein the span calibration channel is communicated with a light receiving channel, and a span calibration light source capable of adjusting light intensity is arranged in the span calibration channel;
another span alignment device comprises an optical fiber communicating between a light emitting channel and a light receiving channel, the optical fiber conducting light emitted by a light source to a receiver in the light receiving channel, the optical fiber having an optical switch disposed thereon.
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| CN108279197A (en) * | 2018-04-26 | 2018-07-13 | 孝感华工高理电子有限公司 | A kind of dust sensor |
| CN108318507B (en) * | 2018-05-11 | 2024-09-17 | 立海科技(江西)有限公司 | Stone plate surface detection device |
| CN110132802B (en) * | 2019-05-07 | 2024-01-12 | 张家港谱析传感科技有限公司 | Online detection device and online detection method for particle size and particle concentration |
| CN111537406A (en) * | 2020-04-29 | 2020-08-14 | 张家港谱析传感科技有限公司 | Particulate matter arrangement method for aerodynamic particle size and concentration detection |
| CN112014281A (en) * | 2020-08-27 | 2020-12-01 | 苏州亿利安机电科技有限公司 | Light path plug head of direct-reading dust concentration measuring instrument |
| CN112014280B (en) * | 2020-08-27 | 2023-11-24 | 苏州亿利安机电科技有限公司 | On-line detection method of direct-reading dust concentration measuring instrument |
| CN112557271B (en) * | 2020-12-17 | 2024-07-09 | 西安鼎研科技股份有限公司 | Particulate matter measuring instrument and working method thereof |
| CN115290518B (en) * | 2022-10-10 | 2022-12-30 | 张家港谱析传感科技有限公司 | Take particle size spectrometer of self calibration |
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