CN206369678U - A kind of inner shield system for laser dust sensor - Google Patents
A kind of inner shield system for laser dust sensor Download PDFInfo
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- CN206369678U CN206369678U CN201621347521.5U CN201621347521U CN206369678U CN 206369678 U CN206369678 U CN 206369678U CN 201621347521 U CN201621347521 U CN 201621347521U CN 206369678 U CN206369678 U CN 206369678U
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- radome
- circuit board
- dust sensor
- laser
- shield system
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Abstract
The utility model discloses a kind of inner shield system for laser dust sensor, including housing, circuit board, air inlet, air outlet, the position of bone are provided with housing, circuit board is provided with power supply voltage stabilizing chip, laser module fixing base is provided with below circuit board, laser module fixing base, which is provided with below tunnel inlet, ducting outlet, circuit board, is provided with lower radome, laser module fixing base is arranged on the inside of lower radome, the electromagnetic interference for shielding laser module and photodiode；Tunnel inlet staggers and communicates setting respectively with air inlet and the ducting outlet with the position of air outlet.The utility model uses lower shielding harness and special Duct design, the problems such as shielding stability produced by effectively solving current laser dust sensor external shield is poor, complex process, cost are high, security risk is big, so that the strong antijamming capability of sensor, accuracy of detection is high.
Description
Technical field
The utility model is related to laser dust sensor technical field, and in particular to a kind of for laser dust sensor
Inner shield system.
Background technology
With the continuous deterioration of environment, turn into every profession and trade field increasingly to the detection of dust concentration so that people live must
Need, and demand will be increasing, and laser dust sensor is used as the kernel component of laser dust detecting instrument, its property
There can be conclusive influence to the quality of detecting instrument.But laser dust sensor is in the course of the work, its inner member
And circuit is often influenceed by external electromagnetic field, cause testing result deviation larger.Therefore, current major part laser powder
Dust sensor solves electromagnetic interference problem using stainless steel casing external shield technology, but external shield technology has following ask
Topic：1st, because air inlet and air outlet can not be shielded completely, therefore the dry of electromagnetism can not be shielded completely using external shield technology
Disturb, shield effectiveness is poor；2nd, external shield needs to install spring additional, is connected to ground shell, stainless steel casing contacted with spring in the presence of compared with
Big contact resistance and the problem of there is loose contact, cause shielding to be failed；3rd, external shield needs to install outside spring and stainless steel
Shell, causes mounting process complicated, cost increase problem；4th, outside stainless steel casing is connected to ground, when being installed in miscellaneous equipment,
There is the security risk of shell and power supply short circuit and fire.
Due to laser dust sensor external shield technology, to there is unstable above-mentioned shielding properties, complex process, cost high, easily
The safety problems such as generation fire so that laser dust sensor accuracy of detection is poor, manufacturing cost is high, and is caused greatly to user
Inconvenience, seriously constrains further genralrlization and the application of laser dust detecting instrument, therefore it is good, anti-to be badly in need of a kind of shielding of offer
The strong shielding harness of interference performance, the accuracy of detection for improving laser dust sensor, is applied to laser dust sensor
Dust detection under various environment.
The content of the invention
The purpose of this utility model is to provide a kind of inner shield system for laser dust sensor, using lower shielding
Cover and special Duct design realize sensor inner shield, improve the antijamming capability and accuracy of detection of sensor, effectively solve mesh
The problems such as shielding stability produced by preceding laser dust sensor external shield is poor, complex process, cost are high, security risk is big.
To achieve the above object, the technical solution adopted in the utility model is：It is a kind of to be used for the interior of laser dust sensor
It is provided with shielding harness, including housing, the housing at circuit board, air inlet, air outlet, the position of bone, air outlet and is provided with fan, electricity
It is provided with above the plate of road below power supply voltage stabilizing chip, circuit board and is provided with laser module fixing base, is set on the laser module fixing base
Have and be provided with lower radome below tunnel inlet, ducting outlet, light sensitive area, photodiode screens, the circuit board, it is described to swash
Light module fixing base is arranged on the inside of lower radome, the electromagnetic interference for shielding laser module and photodiode；Under described
Radome is provided with through hole, and the through hole is respectively superposed with the tunnel inlet on laser module fixing base, ducting outlet；The wind
Fan is located on the outside of lower radome, and the position of the tunnel inlet and air inlet and the ducting outlet and air outlet is staggered respectively
And setting is communicated, the lower radome is located at the side position of bone formation tunnel inlet corresponding with housing and air intake of tunnel inlet
Air communication channel between mouthful, the side position of bone formation air channel corresponding with housing that the lower radome is located at ducting outlet goes out
Mouth and the air communication channel between air outlet.
Further, the circuit board is provided with upper radome, the electromagnetic interference for screened circuit part.
Further, the upper radome wraps up a part for circuit board, and the power supply voltage stabilizing chip is located at upper screen
Cover on the outside of cover.
Further, the laser module fixing base bottom is provided with an anti-light reflection device, and the anti-light reflection device is located at light
Immediately below sensitizing range.
Further, the power supply voltage stabilizing chip is provided with metal net mask.
Further, the through hole of the lower radome is provided with metal net mask.
Further, the lower radome is provided with fixing hole, and the lower radome passes through bolt and circuit through fixing hole
Connect the power supply of plate.
Further, the upper radome is welded on circuit boards.
Further, the housing, which is adopted, is made from an insulative material.
Compared with prior art, the beneficial effects of the utility model are：
1st, inner shield system of the present utility model, simple in construction, easy for installation, with low cost, by sensing element such as photoelectricity
Diode, laser module, circuit board are directly surrounded entirely, and effectiveness compared to traditional external shield effect more preferably, resists dry
Disturb that ability is stronger, so that the accuracy of detection of sensor is greatly improved, the sensor for installing this inner shield system can be more stable
Reliably worked in various environment, it is adaptable to various supporting detection terminals.
2nd, the utility model uses special Duct design, by the position of tunnel inlet and air inlet, ducting outlet and air outlet
Setting of staggering respectively is put, and air inlet, air outlet are arranged on outside radome, effectiveness is further increased, effectively
Solving external shield in the prior art and there is air inlet and air outlet can not completely shield and cause the problem of shield effectiveness is not good.
3rd, the utility model by lower radome be connected with circuit board used in bolt by radome be directly connected to
Get up, it is firm to contact, so that loose contact problem caused by spring need to be installed additional by avoiding external shield, shielding is more stablized.
4th, the utility model housing, which is adopted, is made from an insulative material, safe and reliable, in the absence of short with other external equipment power supplys
Road and the security risk problem for causing fire.
Brief description of the drawings
Fig. 1 is a kind of structural representation of inner shield system for laser dust sensor of the utility model；
Fig. 2 is the structural representation of the utility model laser module fixing base；
Fig. 3 is mounting structure of shield cover schematic diagram under the utility model；
Fig. 4 is the structural representation of radome under a kind of full enclosed of the utility model；
In figure：1st, housing；2nd, circuit board；3rd, air inlet；4th, air outlet；5th, the position of bone；6th, fan；7th, power supply voltage stabilizing chip；
8th, laser module fixing base；81st, tunnel inlet；82nd, ducting outlet；83rd, light sensitive area；84th, photodiode screens；9th, lower screen
Cover cover；91st, through hole；92nd, fixing hole；10th, upper radome；11st, anti-light reflection device.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical solution of the utility model is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole embodiments.
Based on the embodiment in the utility model, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of the utility model protection.
As Figure 1-4, in a kind of inner shield system for laser dust sensor, including housing 1, the housing 1
Provided with circuit board 2, air inlet 3, air outlet 4, the position of bone 5, fan 6 is provided with air outlet 4, the top of circuit board 2 is provided with power supply voltage stabilizing
Chip 7, the lower section of circuit board 2 is provided with laser module fixing base 8, and the laser module fixing base 8 is provided with tunnel inlet 81, air channel
Outlet 82, light sensitive area 83, photodiode screens 84, the lower section of circuit board 2 are provided with lower radome 9, the laser module
Fixed seat 8 is arranged at the lower inner side of radome 9；The lower radome 9 is provided with through hole 91, and the through hole 91 is fixed with laser module
Tunnel inlet 81, ducting outlet 82 on seat 8 are respectively superposed.The lower radome 9 and the grounding connection of circuit board 2 are complete under formation
Shielding space, constitutes full-shield system under photodiode and laser module, for shielding laser module and photodiode
Electromagnetic interference.This have the advantage that：Inner shield system architecture is simple, easy for installation, it is to avoid traditional use spring, no
Become rusty the complicated mounting process such as outer steel shell and double faced adhesive tape fixation, by sensing element such as photodiode, laser module, circuit board 2
Directly it is enclosed in entirely in lower radome 9, compared to traditional external shield effect more preferably, antijamming capability is more for effectiveness
By force, so that the accuracy of detection of sensor is greatly improved, the manufacturing cost reduction of whole sensor, antijamming capability is improved,
Testing result is more stable reliable.
The fan 6 is located at the lower outside of radome 9, the tunnel inlet 81 and air inlet 3 and the ducting outlet 82
Stagger respectively with the position of air outlet 4 and communicate setting, the lower radome 9 is located on the side of tunnel inlet 81 and housing 1
Air communication channel between corresponding the formation tunnel inlet 81 of the position of bone 5 and air inlet 3, the lower radome 9 is located at ducting outlet
Air communication channel between the 82 side formation ducting outlet 82 of the position of bone 5 corresponding with housing 1 and air outlet 4.So it is made
It is advantageous in that：Air inlet 3, air outlet 4 are arranged on outside radome, tunnel inlet 81 and air inlet 3 and ducting outlet 82 with
The position of air outlet 4 is staggered and communicates setting respectively, is alleviated because tunnel inlet 81, ducting outlet 82 are not shielded and are produced
Electromagnetic interference, further increases effectiveness, effectively prevent that external shield has air inlet 3 and air outlet 4 can not be complete
Full-shield and cause the problem of shield effectiveness is not good.
The top of the circuit board 2 is provided with upper radome 10, circuit board 2 and the connection of upper radome 10 collectively constitute one it is full frame
Space is covered, full-shield system, the electromagnetic interference for screened circuit part on circuit is constituted.
Upper shielding harness and lower shielding harness collectively constitute the interior full-shield system of laser dust sensor after fastening.Upper screen
Covering system and lower shielding harness fastening must ensure not staying any gap, stay gap to influence shielding properties, by sensor internal
Sensing element is entirely surrounded, and is loaded in special radome so that antijamming capability and screening ability are all stronger.
Further, the bottom of laser module fixing base 8 is provided with an anti-light reflection device 11, the anti-light reflection device 11
Immediately below light sensitive area 83.This have the advantage that：Because lower radome 9 is made of metal, easily laser is produced anti-
Penetrate, disturb the path of the LASER Light Source of light sensitive area 83 so that larger error occurs in testing result, to prevent because radome is to inspection
The influence of result is surveyed, an anti-light reflection device 11 is set immediately below light sensitive area 83, the reflective influence to light path is prevented effectively from, is protected
Demonstrate,prove accuracy of detection.
Further, a part for the top of the parcel of upper radome 10 circuit board 2, the power supply voltage stabilizing chip 7 is located at
The upper outside of radome 10.This have the advantage that：Because power supply voltage stabilizing chip 7 is easily generated heat, if being wrapped in radome
In 10, then it is unfavorable for power supply voltage stabilizing chip 7 and radiates, easy detonator circuit safety problem.
Further, the power supply voltage stabilizing chip 7 be provided with metal net mask, it is above-mentioned mention power supply voltage stabilizing chip 7 radiating ask
Power supply voltage stabilizing chip 7, to ensure shield effectiveness, is provided separately within a metal net mask by topic herein, metal net mask and circuit board 2
Connection, collectively forms shielding harness on circuit, it is ensured that the shield effectiveness of inner shield system.
The through hole 91 of the lower radome 9 is provided with metal net mask, and not influenceing, tunnel inlet 81 and ducting outlet 82 are empty
In the case of flow of air, tunnel inlet 81 and ducting outlet 82 also are shielded, further improve the shielding of inner shield system
Effect.
The lower radome 9 is provided with fixing hole 92, and the lower radome 9 passes through bolt and circuit board 2 through fixing hole 92
Power supply connect.Whole inner shield system is directly bolted on the ground wire of circuit, simple to operation, effectively shielding
Influence of the electromagnetic interference to circuit, photodiode and laser module, so as to improve the antijamming capability of sensor.
The upper radome 10 is welded on the circuit board 2, it is ensured that obtain reliable effectiveness.
The housing 1, which is adopted, to be made from an insulative material, and cost is low, safe and reliable, in the absence of short with other external equipment power supplys
Road and the security risk problem for causing fire.
Embodiment 1：As shown in Fig. 2 a kind of inner shield system for laser dust sensor, including housing 1, the shell
It is provided with body 1 at circuit board 2, air inlet 3, air outlet 4, the position of bone 5, air outlet 4 and is provided with fan 6, the top of circuit board 2 is provided with power supply
Voltage stabilizing chip 7, the lower section of circuit board 2 is provided with laser module fixing base 8, the laser module fixing base 8 provided with tunnel inlet 81,
Ducting outlet 82, light sensitive area 83, photodiode screens 84, the lower section of circuit board 2 are provided with lower radome 9, the laser
Module fixing base 8 is arranged at the lower inner side of radome 9；The lower radome 9 is provided with through hole 91, the through hole 91 and laser module
Tunnel inlet 81, ducting outlet 82 in fixed seat 8 are respectively superposed.The lower radome 9 and the grounding connection of circuit board 2, are formed
Lower full-shield space, constitutes full-shield system under photodiode and laser module, for shielding laser module and the pole of photoelectricity two
The electromagnetic interference of pipe.
The fan 6 is located at the lower outside of radome 9, the tunnel inlet 81 and air inlet 3 and the ducting outlet 82
Stagger respectively with the position of air outlet 4 and communicate setting, the lower radome 9 is located on the side of tunnel inlet 81 and housing 1
Air communication channel between corresponding the formation tunnel inlet 81 of the position of bone 5 and air inlet 3, the lower radome 9 is located at ducting outlet
Air communication channel between the 82 side formation ducting outlet 82 of the position of bone 5 corresponding with housing 1 and air outlet 4.
The bottom of laser module fixing base 8 is provided with an anti-light reflection device 11, and the anti-light reflection device 11 is located at photaesthesia
Immediately below area 83.
The housing 1 adopts made of plastic；The lower radome 9 is made of stainless steel or the foreign copper-nickel alloy metal material of class.
The lower radome 9 is provided with fixing hole 92, and the lower radome 9 passes through bolt and circuit board 2 through fixing hole 92
Power supply connect.
Embodiment 2：As shown in figure 1, the present embodiment is used for the inner shield system of laser dust sensor and the area of embodiment 1
It is not only that：The top of circuit board 2 is provided with upper radome 10, and circuit board 2 and the connection of upper radome 10 collectively constitute one entirely
Shielding space, constitutes full-shield system, the electromagnetic interference for screened circuit part on circuit.The upper radome 10 is using ocean
Copper-nickel alloy material is made.
During assembling, first upper radome 10 of burn-oning square on the circuit board 2, and laser module, photodiode are put into circuit
In the shielding space that plate 2 is constituted with lower radome 9, upper and lower shielding harness is then locked by fixed screw again, it is overall to load shell
The inside of body 1, it is quick and easy for installation.
Embodiment 3：As shown in figure 1, the present embodiment is used for the inner shield system and above-described embodiment of laser dust sensor
Differ only in：The lower radome 9 is a hexahedron structure close to the side opening of circuit board 2 one, the lower radome 9
Close to the side opening edge of circuit board 2 along fixing hole 92 is provided with, lower radome 9 is connected with the power supply of circuit board 2 with bolt.
Embodiment 4：As shown in figure 4, the present embodiment is used for the inner shield system and above-described embodiment of laser dust sensor
Differ only in：The lower radome 9 is an imperforation hexahedron structure, and laser module fixing base 8 is surrounded entirely, constituted
The lower full-shield system of photodiode and laser module.The lower upper surface of radome 9 is provided with fixing hole 92, and passes through fixed screw
It is connected with the power supply of circuit board 2.Upper shielding harness be the same as Example 2, upper shielding harness collectively constitutes sharp with lower full-shield system
The inner shield system of light dust sensor, shield effectiveness is more preferably.
The interior full-shield system of any one in above-described embodiment is applied to laser dust sensor, after tested, using interior
Full-shield system laser dust sensor can be dust measurement precision controlling 12% or so, compared to industry measurement accuracy 15%
Left and right, can largely improve the precision of detection, relative to the laser dust sensor of same type, successfully evaded into
This height, stability are poor, short life, big noise the shortcomings of, disclosure satisfy that different application occasion detect terminal demand.
While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art,
It is appreciated that these embodiments can be carried out in the case where not departing from principle of the present utility model and spirit a variety of changes, repaiies
Change, replace and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.
Claims (9)
1. a kind of inner shield system for laser dust sensor, including housing（1）, the housing（1）It is interior to be provided with circuit board
（2）, air inlet（3）, air outlet（4）, the position of bone（5）, air outlet（4）Place is provided with fan（6）, circuit board（2）Top is provided with power supply
Voltage stabilizing chip（7）, circuit board（2）Lower section is provided with laser module fixing base（8）, the laser module fixing base（8）It is provided with wind
Road entrance（81）, ducting outlet（82）, light sensitive area（83）, photodiode screens（84）, it is characterised in that：The circuit board
（2）Lower section is provided with lower radome（9）, the laser module fixing base（8）It is arranged at lower radome（9）Inner side, it is sharp for shielding
The electromagnetic interference of optical mode group and photodiode；The lower radome（9）It is provided with through hole（91）, the through hole（91）With laser
Module fixing base（8）On tunnel inlet（81）, ducting outlet（82）It is respectively superposed；The fan（6）Positioned at lower radome（9）
Outside, the tunnel inlet（81）With air inlet（3）And the ducting outlet（82）With air outlet（4）Position stagger respectively
And communicate setting, the lower radome（9）Positioned at tunnel inlet（81）Side and housing（1）The upper corresponding position of bone（5）Formed
Tunnel inlet（81）With air inlet（3）Between air communication channel, the lower radome（9）Positioned at ducting outlet（82）Side
With housing（1）The upper corresponding position of bone（5）Form ducting outlet（82）With air outlet（4）Between air communication channel.
2. a kind of inner shield system for laser dust sensor according to claim 1, it is characterised in that the electricity
Road plate（2）Top is provided with upper radome（10）, the electromagnetic interference for screened circuit part.
3. a kind of inner shield system for laser dust sensor according to claim 2, it is characterised in that on described
Radome（10）Wrap up circuit board（2）A part for top, the power supply voltage stabilizing chip（7）Positioned at upper radome（10）Outside.
4. a kind of inner shield system for laser dust sensor according to claim 1 or 2, it is characterised in that institute
State laser module fixing base（8）Bottom is provided with an anti-light reflection device（11）, the anti-light reflection device（11）Positioned at light sensitive area
（83）Underface.
5. a kind of inner shield system for laser dust sensor according to claim 3, it is characterised in that the electricity
Source voltage stabilizing chip（7）It is provided with metal net mask.
6. a kind of inner shield system for laser dust sensor according to claim 1 or 2, it is characterised in that institute
State lower radome（9）Through hole（91）It is provided with metal net mask.
7. a kind of inner shield system for laser dust sensor according to claim 1 or 2, it is characterised in that institute
State lower radome（9）It is provided with fixing hole（92）, the lower radome（9）Through fixing hole（92）Pass through bolt and circuit board（2）
Power supply connect.
8. a kind of inner shield system for laser dust sensor according to claim 2, it is characterised in that on described
Radome（10）It is welded on circuit board（2）On.
9. a kind of inner shield system for laser dust sensor according to claim 1 or 2, it is characterised in that institute
State housing（1）Adopt and be made from an insulative material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621347521.5U CN206369678U (en) | 2016-12-09 | 2016-12-09 | A kind of inner shield system for laser dust sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621347521.5U CN206369678U (en) | 2016-12-09 | 2016-12-09 | A kind of inner shield system for laser dust sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206369678U true CN206369678U (en) | 2017-08-01 |
Family
ID=59392079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621347521.5U Active CN206369678U (en) | 2016-12-09 | 2016-12-09 | A kind of inner shield system for laser dust sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206369678U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764708A (en) * | 2017-11-24 | 2018-03-06 | 武汉市普瑞思高科技有限公司 | A kind of vehicle-mounted laser PM2.5 sensors |
-
2016
- 2016-12-09 CN CN201621347521.5U patent/CN206369678U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764708A (en) * | 2017-11-24 | 2018-03-06 | 武汉市普瑞思高科技有限公司 | A kind of vehicle-mounted laser PM2.5 sensors |
| CN107764708B (en) * | 2017-11-24 | 2024-01-02 | 武汉市普瑞思高科技有限公司 | Vehicle-mounted laser PM2.5 sensor |
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