CN205749214U - Sensor of dust concentration - Google Patents
Sensor of dust concentration Download PDFInfo
- Publication number
- CN205749214U CN205749214U CN201620670167.3U CN201620670167U CN205749214U CN 205749214 U CN205749214 U CN 205749214U CN 201620670167 U CN201620670167 U CN 201620670167U CN 205749214 U CN205749214 U CN 205749214U
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- dust concentration
- sensor
- housing
- lid
- laser
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Abstract
This utility model belongs to dust concentration field of sensing technologies, particularly relates to sensor of dust concentration.The laser directive light sensitive area of Laser emission assembly output, dust air-flow is entered runner by air inlet, and through light sensitive area, photo-sensitive cell obtains the scattered light signal of dust, then is obtained dust concentration by circuit board process.The circuit board being provided with photo-sensitive cell is installed in housing, and use cover cap together in opening part, the first conductive shielding layer outside housing with lid outside the second conductive shielding layer by the place of covering holding electrically connect, and the second conductive shielding layer keeps electrically connecting with circuit board ground, ensure that the whole sensor outer housing being made up of housing and lid realizes electrically connecting with circuit board ground, thus the reliably extraneous radiation interference of shielding.This sensor of dust concentration uses the housing being electroplate with conductive shielding layer to shield with lid, allows the detection signal of photo-sensitive cell be difficult to by extraneous radiation interference, it is ensured that measurement result is accurate, and is easily worked and assembles, and overall structure is light.
Description
Technical field
This utility model belongs to dust concentration field of sensing technologies, particularly relates to sensor of dust concentration.
Background technology
Sensor of dust concentration is to utilize MIE scattering theory to count particle in air or mass concentration survey
The device of amount.Sensor of dust concentration generally include one for the runner of air current flow, one send out for producing the laser of laser
Penetrate pipe and one for sensing the photo-sensitive cell of light.Air-flow flows in runner, by laser when flowing through above photosensitive part
Irradiating and produce scattered light, photo-sensitive cell receives scattered light, by the analysis of scattered light obtains flowing through the feelings of dust in gas
Condition.
In sensor of dust concentration of the prior art, the detection signal of photo-sensitive cell is easily subject to extraneous radiation interference,
After being interfered, measurement result will produce bigger error.Existing sensor of dust concentration generally uses metal-back to be covered in circuit
On plate or use metal shell parcel overall structure, shield.Metal-back is covered in the scheme on circuit board, because parcel
Incomplete, shield effectiveness is not good enough.Metal shell wraps up integrally-built scheme so that sensor of dust concentration is heavy, and increases
Mounting process.
Utility model content
The purpose of this utility model is to provide a kind of sensor of dust concentration, it is intended to solve existing sensor of dust concentration
When metal-back is covered on circuit board, shield effectiveness is not good enough and causes heavy when metal shell parcel overall structure and installs
The technical problem of complex process.
This utility model is achieved in that sensor of dust concentration, including:
Having a runner and the housing of an opening, one end of described runner is formed with air inlet, the other end is formed and gives vent to anger
Hole, is provided with a light sensitive area in described runner, the outer wall of described housing is electroplate with the first conductive shielding layer；
For the Laser emission assembly by laser output to described light sensitive area；
Its photosurface is toward the photo-sensitive cell of described light sensitive area；
The circuit board in being located at described housing and electrically connected with described photo-sensitive cell；And
Being covered on the lid of described opening part, the outer wall of described lid is electroplate with and being electrically connected to ground of described circuit board
Second conductive shielding layer, described first conductive shielding layer and described second conductive shielding layer by described lid and described opening it
Between the place of covering electrical connection.
Further, described housing has the inner chamber communicated with described opening, is provided with first in described inner chamber separately
Installing plate and the second installing plate, be formed between described first installing plate and described second installing plate and send out for installing described laser
Penetrate the mounting groove of assembly.
Further, described first installing plate offers first lead to for connect described air inlet and described mounting groove
Air holes, described second installing plate offers the second air vent for connecting described venthole and described mounting groove.
Further, described air inlet and described venthole lay respectively in the opposite sides of described housing, by described shell
The described runner that the inwall of body, described first installing plate enclose formation with described second installing plate is U-shaped.
Further, described lid is intended for the side of described circuit board and is provided with connection post, the outer wall of described connection post
Being electroplate with the 3rd conductive shielding layer electrically connected with described second conductive shielding layer, described circuit board has and is electrically connected with described ground wire
The Lu Tong district of windowing connect, described connection post is away from the end abutment of described lid in described Lu Tong district of windowing.
Further, described housing and described lid are moulding.
Further, the extraction sector for air-flow to be introduced described runner by described air inlet is also included.
Further, also include the light trapping for absorbing the laser by the output of described Laser emission assembly, described photosensitive
Element is arranged between described Laser emission assembly and described light trapping.
Further, described circuit board offering the perforate communicated with described runner, the inner side of described lid is provided with use
In the air-flow of described air inlet position is guided the dust barrier to described perforate.
Further, described Laser emission assembly includes the LASER Discharge Tube for producing laser, along being sent out by described laser
Penetrate plus lens, the first diaphragm and the second diaphragm that the laser optical path direction of pipe generation sets gradually.
This utility model having the technical effect that relative to prior art, the laser directive photaesthesia of Laser emission assembly output
District, dust air-flow is entered runner by air inlet, and through light sensitive area, photo-sensitive cell obtains the scattered light signal of dust, then by electricity
Road plate processes and obtains dust concentration.The circuit board being provided with photo-sensitive cell is installed in housing, and uses cover cap together in opening
Place, the first conductive shielding layer outside housing with lid outside the second conductive shielding layer electrically connected by the place's of covering holding, and second
Conductive shielding layer keeps electrically connecting with circuit board ground, it is ensured that the whole sensor outer housing being mainly made up of housing and lid and electricity
Road plate ground wire realizes electrical connection, thus reliably shields extraneous radiation interference.This sensor of dust concentration uses and is electroplate with conducting screen
The housing covering layer shields with lid, allows the detection signal of photo-sensitive cell be difficult to by extraneous radiation interference, it is ensured that to measure knot
Fruit accurately, and is easily worked and assembles, and overall structure is light.
Accompanying drawing explanation
Fig. 1 is the three-dimensional installation diagram of the sensor of dust concentration that this utility model embodiment provides；
Fig. 2 is the three-dimensional exploded view of the sensor of dust concentration of Fig. 1；
Fig. 3 is the assembling signal of housing, Laser emission assembly and the photo-sensitive cell applied in the sensor of dust concentration of Fig. 1
Figure；
Fig. 4 is the three-dimensional structure diagram of the housing applied in the sensor of dust concentration of Fig. 1；
Fig. 5 is mounting seat, circuit board, Laser emission assembly and the photo-sensitive cell applied in the sensor of dust concentration of Fig. 1
Assembling schematic diagram；
Fig. 6 is the assembling schematic diagram of mounting seat and the Laser emission assembly applied in the sensor of dust concentration of Fig. 1；
Fig. 7 is the three-dimensional structure diagram of the lid applied in the sensor of dust concentration of Fig. 1；
Fig. 8 is the three-dimensional structure diagram of another angle of the lid of Fig. 7.
Housing 10 second air vent 151 lid 50
Antetheca 10a mounting groove 16 dust barrier 51
Rear wall 10b connects seat 17 and connects post 52
Left wall 10c screwed hole 171 installing hole 53
Right wall 10d Laser emission assembly 20 extraction sector 60
Runner 11 LASER Discharge Tube 21 mounting seat 70
Light sensitive area 111 plus lens 22 accommodates chamber 71
Air inlet 112 first diaphragm 23 louvre 72
Venthole 113 second diaphragm 24 adjutage 73
Opening 12 photo-sensitive cell 30 detects hole 731
Light trapping 13 circuit board 40 first conductive shielding layer 81
First installing plate 14 is windowed Lu Tong district 41 second conductive shielding layer 82
First air vent 141 through hole 411 the 3rd conductive shielding layer 83
Second installing plate 15 perforate 42
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.Should be appreciated that specific embodiment described herein is only in order to explain
This utility model, is not used to limit this utility model.
Referring to Fig. 1 to Fig. 4, the sensor of dust concentration that this utility model embodiment provides, including having a runner 11
With the housing 10 of an opening 12, one end of runner 11 is formed with air inlet 112, the other end is formed with venthole 113, in runner 11
Being provided with a light sensitive area 111, the outer wall of housing 10 is electroplate with the first conductive shielding layer 81；For laser is exported to light sensitive area
The Laser emission assembly 20 of 111；Photo-sensitive cell 30, its photosurface is toward light sensitive area 111；It is located at the circuit board in housing 10
40, circuit board 40 electrically connects with photo-sensitive cell 30；And be covered on the lid 50 at opening 12, the outer wall of lid 50 be electroplate with
Second conductive shielding layer 82 being electrically connected to ground of circuit board 40, the first conductive shielding layer 81 passes through with the second conductive shielding layer 82
The place of covering between lid 50 with opening 12 electrically connects.
The laser directive light sensitive area 111 of Laser emission assembly 20 output, dust air-flow (shown in double dot dash line) is by air inlet
Hole 112 enters runner 11, and through light sensitive area 111, photo-sensitive cell 30 obtains the scattered light signal of dust, then by circuit board 40
Reason obtains dust concentration.The circuit board 40 being provided with photo-sensitive cell 30 is installed in housing 10, and uses lid 50 to be covered on out
At mouth 12, the first conductive shielding layer 81 outside housing 10 and the second conductive shielding layer 82 outside lid 50 keep electricity by the place of covering
Connect, and the second conductive shielding layer 82 keeps being electrically connected to ground with circuit board 40, it is ensured that be mainly made up of housing 10 and lid 50
Whole sensor outer housing and circuit board 40 ground wire realize electrically connect, thus reliably shielding external world radiation interference.This dust concentration
Sensor uses the housing 10 being electroplate with conductive shielding layer to shield with lid 50, allows the detection signal of photo-sensitive cell 30 be difficult to
By extraneous radiation interference, it is ensured that measurement result is accurate, and is easily worked and assembles, and overall structure is light.
The circuit board 40 being provided with Laser emission assembly 20 and photo-sensitive cell 30 is horizontally placed in housing 10 opening 12, allows sharp
Light emission component 20 and photo-sensitive cell 30 are distributed in runner 11 precalculated position, and the program is easily assembled.Circuit board 40 is PCB.Sense
Optical element 30 is placed in housing 10 runner 11, and the laser of Laser emission assembly 20 output is parallel with the photosurface of photo-sensitive cell 30.
The scattered light signal of dust is converted to the signal of telecommunication by photo-sensitive cell 30, then is obtained dust concentration by circuit board 40 process, and this is existing
There is technology.
First conductive shielding layer 81 of housing 10 is electroplated metal layer, is used for shielding extraneous radiation interference.The of lid 50
Two conductive shielding layers 82 are electroplated metal layer, are used for shielding extraneous radiation interference.Electroplated metal layer can be electroless nickel layer or its
Its electroplated metal layer.Lid 50 is covered at housing 10 opening 12, the of the first conductive shielding layer 81 of housing 10 and lid 50
Two conductive shielding layers 82 contact and keep electrical connection.
Further, housing 10 is in cube, and housing 10 has antetheca 10a, rear wall 10b, left wall 10c, right wall 10d.Enter
Pore 112 and venthole 113 are distributed on antetheca 10a and rear wall 10b respectively.It is to be appreciated that housing 10 can also be in spheroid
Or other shape.
Further, referring to Fig. 3, Fig. 4, housing 10 has the inner chamber communicated with opening 12, arranges separately in inner chamber
There is the first installing plate 14 and the second installing plate 15, be formed for installing laser between the first installing plate 14 and the second installing plate 15
The mounting groove 16 of emitting module 20.The program is easily worked, it is simple to the assembling of Laser emission assembly 20.
Further, the first installing plate 14 offers the first air vent for connecting air inlet 112 and mounting groove 16
141, the second installing plate 15 offers the second air vent 151 for connecting venthole 113 and mounting groove 16.Allow by air inlet
112 air-flows entering runner 11 divide a part, the first air vent 141 enter mounting groove 16, then through the second air vent 151 row
Go out venthole 113, make the Laser emission assembly 20 in mounting groove 16 be continuously in good fan Warm status, allow dust concentration sense
Device is durable.In Laser emission assembly 20, LASER Discharge Tube 21 is main heater element, and the first air vent 141 and second ventilates
LASER Discharge Tube 21 is dispelled the heat by the bootable air-flow in hole 151.
Further, air inlet 112 and venthole 113 lay respectively in the opposite sides of housing 10, by housing 10
The runner 11 that wall, the first installing plate 14 enclose formation with the second installing plate 15 is U-shaped.This compact conformation, is easily worked, and allows gas
Laser emission assembly 20 in mounting groove 16 is dispelled the heat by stream.It is to be appreciated that runner 11 can also in yi word pattern or other shape,
And air inlet 112 and venthole 113 are arranged in housing 10 relevant position.
Further, referring to Fig. 2, Fig. 7, Fig. 8, lid 50 is intended for the side of circuit board 40 and is provided with connection post 52,
Connect post 52 outer wall be electroplate with the 3rd conductive shielding layer 83 electrically connect with the second conductive shielding layer 82, circuit board 40 have and
The Lu Tong district 41 of windowing being electrically connected to ground, connects post 52 and is away from the end abutment of lid 50 in Lu Tong district 41 of windowing.3rd leads
Shield layer 83 is electroplated metal layer, and electroplated metal layer can be electroless nickel layer or other electroplated metal layer.Connect post 52 bottom surface
Tightly contacting with the Lu Tong district 41 of windowing of circuit board 40, the 3rd conductive shielding layer 83 electrically connects with Lu Tong district 41 of windowing, so that
Second conductive shielding layer 82 electrically connects with Lu Tong district 41 of windowing, and then makes the ground wire guarantor of the second conductive shielding layer 82 and circuit board 40
Hold electrical connection, the first conductive shielding layer 81 with the second conductive shielding layer 82 contact holding electrical connection, thus reliably shielding outside
Boundary's radiation interference.Specifically, connecting post 52 and be shaped on lid 50, this structure is easily worked.
Further, being provided with the connection seat 17 with screwed hole 171 in housing 10, lid 50 offers with being connected on post 52
Through installing hole 53, offers through hole 411 at Lu Tong district 41 of windowing, lid 50, circuit board 40 and housing 10 are by wearing successively
Be located at installing hole 53, through hole 411 is connected with the securing member (not shown) of screwed hole 171.This structure is easily assembled, and allows housing 10
The first conductive shielding layer 81 contact with the second conductive shielding layer 82 of lid 50 holding electrical connection.Connect seat 17 and be connected post
The on-demand configuration of quantity of 52.It is to be appreciated that can also be connected by buckle structure or other machinery between housing 10 and lid 50
The mode of connecing realizes connecting.
Further, housing 10 and lid 50 are moulding.The program is easily worked, and light weight.It is to be appreciated that
Housing 10 can also be for using the material that other density is lower than density metal the structure using existing technique to make with lid 50
Part, makes overall structure light.Specifically, housing 10 uses black plastic material to make, beneficially photo-sensitive cell 30 measurement result
Accurately.
Further, the extraction sector 60 for air-flow to be introduced runner 11 by air inlet 112 is also included.Extraction sector 60
For fan.Fan is installed at venthole 113, forms negative pressure and make air-flow enter from air inlet 112, from fan in the way of bleeding
Position is flowed out.It is to be appreciated that extraction sector 60 can also be air pump or other extraction sector.Extraction sector 60 and electricity
Road plate 40 electrically connects.
Further, referring to Fig. 4, the cross-sectional area of venthole 113 is more than the cross-sectional area of air inlet 112.Can
Make sensor internal air-flow more stable.Preferably, venthole 113 area is more than one times of air inlet 112 area, and structure is tight
Gathering, internal gas flow is stable.Venthole 113 is flared aperture, is easily worked.
Further, please refer to Fig. 3, also include falling into for the light absorbing the laser exported by Laser emission assembly 20
Trap 13, photo-sensitive cell 30 is arranged between Laser emission assembly 20 and light trapping 13.The laser of Laser emission assembly 20 output is worn
Absorbed by light trapping 13 after crossing light sensitive area 111.Laser enters light trapping 13 behind the surface of photo-sensitive cell 30.Light trapping
13 take shape in housing 10, for absorbing the laser injected.Light trapping 13 uses light absorbent to make, or carries out sub-optical processing,
To realize extinction.
Further, refer to Fig. 2, Fig. 7, Fig. 8, circuit board 40 offers the perforate 42 communicated with runner 11, lid
The inner side of 50 is provided with the air-flow at by air inlet 112 and guides the dust barrier 51 to perforate 42.Air inlet 112 and perforate
The normal direction of 42 is staggered, and the air-flow with dust is entered by air inlet 112, and the big dust particle in air-flow is stopped by dust
Wall 51 stops, then in perforate 42 enters runner 11.Reduce bulky grain dirt ash and flow through light sensitive area 111, reduce light sensitive area
The dust accumulation of 111, extends the service life of sensor of dust concentration.Dust barrier 51 is shaped on lid 50, should
Structure is easily worked.
Further, referring to Fig. 3, Fig. 5, Fig. 6, Laser emission assembly 20 includes the LASER Discharge Tube for producing laser
21, plus lens the 22, first diaphragm 23 set gradually along the laser optical path direction produced by LASER Discharge Tube 21 and the second light
Door screen 24.Laser is focused at directly over light sensitive area 111, i.e. photo-sensitive cell 30 by plus lens 22.Laser and air-flow converge at light
Sensitizing range 111, former direction incident beam incident light trap 13.First diaphragm 23 and the second diaphragm 24 are aperture, the first light
The combination of door screen 23 and the second diaphragm 24 can reduce the shot noise of diaphragm mouth.Specifically, the power of LASER Discharge Tube 21 is
3.6mw, outside dimension is 6mm, and wave band is 650nm.For LASER Discharge Tube 21, plus lens 22 is used to be converged in by laser
The position of 15mm, now spot size and the angle of divergence of test point is in suitable size, measures and obtains sensor of dust concentration
Accuracy and stability more preferably.Convergent point is 2mm with the distance of photo-sensitive cell 30.In actual applications, on-demand selection laser
Transmitting tube 21 and the parameter of plus lens 22.
Further, also include that mounting seat 70, mounting seat 70 have a receiving chamber 71 and the heat radiation connected with receiving chamber 71
Hole 72, LASER Discharge Tube 21, plus lens the 22, first diaphragm 23 be mounted on accommodating in chamber 71, and the second diaphragm 24 is installed on peace
On the sidewall of dress seat 70, LASER Discharge Tube 21 is dispelled the heat by louvre 72.Mounting seat 70 is prolonged in the one end being provided with the second diaphragm 24
Stretch and be formed with adjutage 73, adjutage 73 offers detection hole 731, in photo-sensitive cell 30 is installed on detection hole 731 and with electricity
Road plate 40 electrically connects.This structure is easily worked and assembles.
The air purifier that this utility model embodiment provides, including air channel part and the dust concentration sensing with air channel
Device, sensor of dust concentration is installed on air channel part and is intended on the inwall in air channel.It is to be appreciated that sensor of dust concentration also may be used
To be installed on the outer wall of air purifier, sensor of dust concentration can also be applied to other and have on the equipment in air channel, should
Sensor of dust concentration is susceptible to outer gas stream interference, can keep the detection of degree of precision under different air ambients.
These are only preferred embodiment of the present utility model, not in order to limit this utility model, all in this practicality
Any amendment, equivalent and the improvement etc. made within novel spirit and principle, should be included in guarantor of the present utility model
Within the scope of protecting.
Claims (10)
1. sensor of dust concentration, it is characterised in that including:
Having a runner and the housing of an opening, one end of described runner is formed with air inlet, the other end is formed with venthole, institute
Being provided with a light sensitive area in stating runner, the outer wall of described housing is electroplate with the first conductive shielding layer；
For the Laser emission assembly by laser output to described light sensitive area；
Its photosurface is toward the photo-sensitive cell of described light sensitive area；
The circuit board in being located at described housing and electrically connected with described photo-sensitive cell；And
Being covered on the lid of described opening part, the outer wall of described lid is electroplate be electrically connected to ground second with described circuit board
Conductive shielding layer, described first conductive shielding layer and described second conductive shielding layer are by between described lid and described opening
Cover place's electrical connection.
2. sensor of dust concentration as claimed in claim 1, it is characterised in that described housing has and communicates with described opening
Inner chamber, is provided with the first installing plate and the second installing plate, described first installing plate and described second peace separately in described inner chamber
It is formed with the mounting groove for installing described Laser emission assembly between dress plate.
3. sensor of dust concentration as claimed in claim 2, it is characterised in that offer on described first installing plate for even
Logical described air inlet and the first air vent of described mounting groove, described second installing plate offers for connecting described venthole
The second air vent with described mounting groove.
4. sensor of dust concentration as claimed in claim 3, it is characterised in that described air inlet and described venthole position respectively
In the opposite sides of described housing, the inwall of described housing, described first installing plate enclose shape with described second installing plate
The described runner become is U-shaped.
5. sensor of dust concentration as claimed in claim 1, it is characterised in that described lid is intended for the one of described circuit board
Side is provided with connection post, and the outer wall of described connection post is electroplate with the 3rd conductive shield electrically connected with described second conductive shielding layer
Layer, described circuit board has and the described Lu Tong district of windowing being electrically connected to ground, and described connection post is away from the end of described lid
Window described in being connected to Lu Tong district.
6. sensor of dust concentration as claimed in claim 1, it is characterised in that described housing and described lid are injection
Part.
7. the sensor of dust concentration as described in any one of claim 1 to 6, it is characterised in that also include for by air-flow by
Described air inlet introduces the extraction sector of described runner.
8. the sensor of dust concentration as described in any one of claim 1 to 6, it is characterised in that also include for absorbing by institute
Stating the light trapping of the laser of Laser emission assembly output, described photo-sensitive cell is arranged at described Laser emission assembly and falls into described light
Between trap.
9. the sensor of dust concentration as described in any one of claim 1 to 6, it is characterised in that offer on described circuit board
The perforate communicated with described runner, the inner side of described lid is provided with for guiding the air-flow of described air inlet position to described perforate
Dust barrier.
10. the sensor of dust concentration as described in any one of claim 1 to 6, it is characterised in that described Laser emission assembly bag
Include the LASER Discharge Tube for producing laser, the convergence set gradually along the laser optical path direction produced by described LASER Discharge Tube
Lens, the first diaphragm and the second diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620670167.3U CN205749214U (en) | 2016-06-27 | 2016-06-27 | Sensor of dust concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620670167.3U CN205749214U (en) | 2016-06-27 | 2016-06-27 | Sensor of dust concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205749214U true CN205749214U (en) | 2016-11-30 |
Family
ID=57382942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620670167.3U Active CN205749214U (en) | 2016-06-27 | 2016-06-27 | Sensor of dust concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205749214U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328695A (en) * | 2017-09-01 | 2017-11-07 | 北京攀藤科技有限公司 | Particulate matter quality concentration sensor and particulate matter quality concentration detection method |
-
2016
- 2016-06-27 CN CN201620670167.3U patent/CN205749214U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107328695A (en) * | 2017-09-01 | 2017-11-07 | 北京攀藤科技有限公司 | Particulate matter quality concentration sensor and particulate matter quality concentration detection method |
| CN107328695B (en) * | 2017-09-01 | 2024-05-31 | 南昌攀藤科技有限公司 | Particulate matter mass concentration sensor and particulate matter mass concentration detection method |
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