CN205643092U - Dust concentration sensor - Google Patents
Dust concentration sensor Download PDFInfo
- Publication number
- CN205643092U CN205643092U CN201620481021.4U CN201620481021U CN205643092U CN 205643092 U CN205643092 U CN 205643092U CN 201620481021 U CN201620481021 U CN 201620481021U CN 205643092 U CN205643092 U CN 205643092U
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- laser
- gas outlet
- dust concentration
- concentration sensor
- ventilating duct
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Abstract
The utility model is suitable for a suspended particles concentration detection device field provides dust concentration sensor in the gas, and it includes the laser sensor body, is equipped with air inlet, gas outlet on the laser sensor body and feeds through the ventiduct between air inlet and gas outlet, and the ventiduct has photosensitive measuring position, still is equipped with the current -limiting structure in the ventiduct, and the current -limiting structure lies in between air inlet and the photosensitive measuring position and is close to photosensitive measuring position setting. The utility model discloses a photosensitive measuring position the place ahead at the ventiduct sets up a current -limiting structure, thereby can form a current -limiting passageway in the place ahead at photosensitive measuring position, the air current is because the inertia effect after flowing through the current -limiting passageway, can continue to keep to concentrate the state through photosensitive measuring position, make air current concentration degree when flowing through photosensitive measuring position improve, thus, the dust granule quantity that is detected had both been increased, can not increase parietal reflection parasitics light in the laser sensor body again, dust concentration sensor's detection accuracy has been improved.
Description
Technical field
This utility model belongs to concentration of suspended particles detection device field in gas, particularly relates to dust concentration and passes
Sensor.
Background technology
Laser dust concentration sensor is to utilize MIE scattering theory that particle in air is carried out count measurement
Or the sensor that mass concentration is measured, it generally comprises a ventilating duct, a LASER Discharge Tube and one
Photo-sensitive cell.Its operation principle is: the air-flow entering laser dust concentration sensor flows along ventilating duct,
Being irradiated by laser when flowing through above photo-sensitive cell and produce scattered light, photo-sensitive cell receives scattered light, passes through
The analysis of scattered light i.e. can be obtained the dust concentration situation flowing through in photo-sensitive cell overhead stream.
In prior art, air-flow freely flows through above photo-sensitive cell along ventilating duct, so, is detected
Dust concentration situation can be affected by ventilating duct width, so, if the width of ventilating duct is the widest, examine
A large amount of particle can be lost during survey, thus the accuracy in detection of serious laser dust concentration sensor;If it is and logical
Scattered light on the width too narrow then laser dust concentration sensor inwall in air channel strengthens, and then can cause veiling glare
Increase, and the increase of veiling glare also influences whether the accuracy in detection of laser dust concentration sensor.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, it is provided that dust concentration sensor,
Which solve existing laser dust concentration sensor when detecting air-flow dust concentration due to by ventilating duct width
Impact causes the technical problem of its accuracy in detection difference.
For reaching above-mentioned purpose, the technical solution adopted in the utility model is: dust concentration sensor, including
Laser sensor body, described laser sensor body is provided with air inlet, gas outlet and enters described in being communicated in
Ventilating duct between QI KOU and described gas outlet, described ventilating duct has photosensitive detection position, described ventilating duct
Inside be additionally provided with flow restriction, described flow restriction between described air inlet and described photosensitive detection position also
Arrange near described photosensitive detection position.
Alternatively, described laser sensor body includes having inner chamber, described air inlet, described gas outlet
Main casing and be located at the Laser emission assembly of described interior intracavity, photo-sensitive cell, circuit board, described interior intracavity limits
Surely having described ventilating duct, described photo-sensitive cell to be positioned at described ventilating duct, described Laser emission assembly is towards institute
Stating photosensitive detection position and launch laser beam, described flow restriction is located on described Laser emission assembly or is located at
On described main casing.
Alternatively, described Laser emission assembly includes mounting seat, the Laser emission being installed in described mounting seat
Managing and be located at the condenser lens of described LASER Discharge Tube front end, described mounting seat includes pedestal and from described pedestal
Top extends the extension board being convexly equipped in described pedestal front, described extension board runs through and is provided with and described photosensitive unit
Part just relative to detection hole, described flow restriction is that the current limliting plate of described extension board side is located in bending.
Alternatively, described pedestal is provided with the appearance housing location for described LASER Discharge Tube and described condenser lens
Chamber and the louvre connected with described cavity volume.
Alternatively, described pedestal has the tail end away from described extension board, and described louvre is near described tail end
Arrange.
Alternatively, described interior intracavity is further defined with snapping in the draw-in groove of location for described Laser emission assembly, described
Draw-in groove has the two groove sidewalls being oppositely arranged, described pedestal be designed with institute towards the sidepiece of groove sidewall described in two
Stating louvre, one of them described groove sidewall is located between described gas outlet and described draw-in groove and on this groove sidewall
It is provided with the dissipating vias for connecting described gas outlet and the described louvre near this groove sidewall.
Alternatively, described flow restriction has the ventilation section metering hole less than described ventilating duct ventilation section.
Alternatively, described laser sensor body has the first sidepiece and the second sidepiece that interval is oppositely arranged,
Described first sidepiece is located at by described air inlet, and described second sidepiece, described ventilating duct bag are located in described gas outlet
Include along parallel described first sidepiece extend the first ventilation unit and bending be located at described first ventilation unit one end and from
The second ventilation unit that described first sidepiece extends towards described gas outlet.
Alternatively, the angle enclosing formation between described first ventilation unit and described second ventilation unit is obtuse angle, institute
State and between the second ventilation unit and described gas outlet, be provided with a light barrier, leading to away from described first of described light barrier
The position in wind portion is provided with several for the air-vent connecting described second ventilation unit and described gas outlet.
Alternatively, described laser sensor this most internal be additionally provided with for detect described laser sensor this most internal it
The critesistor of ambient temperature.
The dust concentration sensor that this utility model provides, is set by the front, photosensitive detection position at ventilating duct
Putting a flow restriction, thus can form a restricted flow passage in the front at photosensitive detection position, air-flow is flowing through limit
Due to effect of inertia after circulation road, may proceed in the way of keeping collected state by photosensitive detection position and
Scatter again after flowing through photosensitive detection position so that air-flow concentration degree when flowing through photosensitive detection position improves, this
Sample, had both added the dust granule quantity being detected, will not increase again laser sensor chamber body wall
Reflection veiling glare, improves the accuracy in detection of dust concentration sensor dramatically.
Accompanying drawing explanation
Fig. 1 is the Laser emission assembly assembling schematic diagram one with drain pan of this utility model embodiment offer;
Fig. 2 is the Laser emission assembly assembling schematic diagram two with drain pan of this utility model embodiment offer;
Fig. 3 is the schematic diagram of the airflow passes position limiting structure that this utility model embodiment provides;
Fig. 4 is the structural representation one of the mounting seat that this utility model embodiment provides;
Fig. 5 is the structural representation two of the mounting seat that this utility model embodiment provides;
Fig. 6 is the generalized section of the Laser emission assembly that this utility model embodiment provides;
Fig. 7 is critesistor, Laser emission assembly, blower fan and the drain pan that this utility model embodiment provides
Fitting plane schematic diagram;
Fig. 8 is the overall assembling schematic diagram of the laser sensor body that this utility model embodiment provides;
Fig. 9 is the decomposing schematic representation of the dust concentration sensor that this utility model embodiment provides;
Figure 10 is critesistor, Laser emission assembly, photo-sensitive cell and the electricity that this utility model embodiment provides
The fitting plane schematic diagram of road plate;
Figure 11 is the structural representation of the top cover that this utility model embodiment provides.
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 embodiment, this utility model is further elaborated.Should be appreciated that described herein specifically
Embodiment, only in order to explain this utility model, is not used to limit this utility model.
It should be noted that when an element is described as " being fixed on " or " being arranged at " another element
Time upper, it can be directly on another element or may be simultaneously present centering elements.When an element quilt
Being depicted as " connection " another element, it can be to be directly connected to another element or may deposit simultaneously
At centering elements.
Also, it should be noted the orientation term such as left and right, upper and lower, top in following example, end,
It is only relative concept or with the normal operating condition of product as reference each other, and should not be regarded as having
Restrictive.
As shown in figs. 1-11, the dust concentration sensor that this utility model embodiment provides, including laser sensing
Device body 1, laser sensor body 1 is provided with air inlet 101, gas outlet 102 and is communicated in air inlet
Ventilating duct 103 between 101 and gas outlet 102, ventilating duct 103 has photosensitive detection position, ventilating duct
Be additionally provided with flow restriction 10 in 103, flow restriction 10 between air inlet 101 and photosensitive detection position also
Arrange near photosensitive detection position, i.e. flow restriction 10 is positioned at the front at photosensitive detection position along air flow direction,
Air-flow, after air inlet 101 enters in ventilating duct 103, can first flow through flow restriction 10 and pass through photosensitive detection
Position.The dust concentration sensor that this utility model embodiment provides, by the photosensitive inspection at ventilating duct 103
Survey front, position and one flow restriction 10 is set, thus a current limliting can be formed in the front at photosensitive detection position and lead to
Road, air-flow due to effect of inertia, may proceed to pass through in the way of keeping collected state after flowing through restricted flow passage
Also scatter after flowing through photosensitive detection position in photosensitive detection position so that air-flow is flowing through photosensitive detection position again
Time concentration degree improve, dust loss is greatly decreased, and so, has both added the dust granule number being detected
Amount, will not increase again the reflection veiling glare of laser sensor body 1 internal chamber wall, improve dust dramatically
The accuracy in detection of concentration sensor.
Preferably, in the lump with reference to shown in Fig. 1, Fig. 3 and Fig. 4, flow restriction 10 has ventilation section and is less than
The metering hole 100 of ventilating duct 103 ventilation section.During airflow passes metering hole 100, concentration degree improves, and
Due to effect of inertia, air-flow also can keep collected state when metering hole 100 flows through photosensitive detection position,
Scatter further along behind photosensitive detection position, thus, give vent to anger width narrow into gas can be formed at photosensitive detection position
Structure so that detection air-flow concentration degree improve, dust loss is greatly decreased, and improves the inspection of product
Survey sensitivity.
Preferably, in the lump with reference to shown in Fig. 7, Fig. 9 and Figure 10, be provided with in laser sensor body 1 for
The critesistor 15 of the ambient temperature in detection laser sensor body 1.Herein, by laser sensor
Set up critesistor 15 in body 1, so, laser sensor can be detected in real time originally by critesistor 15
Ambient temperature in body 1, thus be beneficial to be adjusted according to actual environment temperature, revise dust concentration sensing
The output result of device, efficiently solve dust concentration sensor because of Laser emission assembly 12 the most defeated
Go out power difference and cause the technical problem that dust concentration sensor outputs accuracy is low.
Preferably, critesistor 15 is convex to be exposed in ventilating duct 103, so, and can be real by critesistor 15
Time detection ventilating duct 103 in air themperature, thus be beneficial to improve further the temperature that critesistor 15 detects
The accurate reliability of degree.
Preferably, in the lump with reference to shown in Fig. 1, Fig. 7, Fig. 8 and Fig. 9, laser sensor body 1 includes tool
Have inner chamber, air inlet 101, the main casing 11 of gas outlet 102 and be located at interior intracavity Laser emission assembly 12,
Photo-sensitive cell 13, circuit board 14;Interior intracavity defines ventilating duct 103, photo-sensitive cell 13 and photosensitive detection
Position is that upper and lower para-position is arranged, and the position with photo-sensitive cell about 13 para-position setting of ventilating duct 103 is light
Quick detection position, Laser emission assembly 12 is towards photosensitive detection position transmitting laser beam, and flow restriction 10 sets
On Laser emission assembly 12 or be located on main casing 11.Laser emission assembly 12, photo-sensitive cell 13,
Circuit board 14 and critesistor 15 are all located at interior intracavity, Laser emission assembly 12, photo-sensitive cell 13 and heat
Quick resistance 15 is all electrically connected with circuit board 14, and Laser emission assembly 12 can be under the control of circuit board 14
Send out laser beam;Its detection information can be fed back to circuit board 14 by photo-sensitive cell 13 and critesistor 15
On, and the detection information fed back photo-sensitive cell 13 and critesistor 15 by circuit board 14 processes backward
Outer output detections result.The setting of flow restriction 10, concentration degree when can make airflow passes photosensitive detection position
Improving, dust loss is greatly decreased, thus improves the detection sensitivity of product.
Preferably, in the lump with reference to shown in Fig. 1-6, Laser emission assembly 12 includes mounting seat 121, is installed on
LASER Discharge Tube 122 in mounting seat 121 and the condenser lens 123 being located at LASER Discharge Tube 122 front end,
Mounting seat 121 includes pedestal 1211 and extends the extension being convexly equipped in pedestal 1211 front from pedestal 1211 top
Plate 1212, extension board 1212 runs through be provided with photo-sensitive cell 13 just relative to detection hole 12121, ventilate
The position with the para-position setting of detection hole about 12121 in road 103 is photosensitive detection position, flow restriction 10
Be located at the current limliting plate of extension board 1212 side for bending, metering hole 100 runs through to be located on current limliting plate.This
Place, the plate that flow restriction 10 is set in mounting seat 121, its simple in construction, easily fabricated, and
The installation procedure of flow restriction 10 can be saved.Photo-sensitive cell 13 and Laser emission assembly 12 are installed on circuit board
After the lower surface of 14, photo-sensitive cell 13 is vertically positioned at circuit board 14 lower surface and detection hole
Between 12121, when Laser emission assembly 12 sends out laser beam, detection hole 12121 be positioned at laser beam with
Between photo-sensitive cell 13, and the laser beam that Laser emission assembly 12 sends is along the side parallel with photo-sensitive cell 13
Formula is irradiated in light trapping chamber 107 from the underface in detection hole 12121 and photo-sensitive cell 13.Detection hole 12121
Setting, be beneficial to ensure that photo-sensitive cell 13 can effectively detect and produce when laser beam irradiation crosses ventilating duct 103
Scattered information, thus it is dense to flowing through dust in the air-flow of ventilating duct 103 to be beneficial to realize laser sensor body 1
The detection function of degree.The setting of condenser lens 123, converges for the laser beam sent by Laser emission assembly 12
Gather in detection hole 12121 and the underface of photo-sensitive cell 13.
Preferably, in the lump with reference to shown in Fig. 1-5, pedestal 1211 is provided with for LASER Discharge Tube 122 and focusing
The accommodating cavity volume 12111 positioned of lens 123 and the louvre 12112 connected with cavity volume 12111.Louvre
The setting of 12112 so that the heat produced when LASER Discharge Tube 122 works can distribute, effectively in time
Improve the radiating effect of LASER Discharge Tube 122, be beneficial to ensure the service life of LASER Discharge Tube 122.
Preferably, pedestal 1211 has the tail end away from extension board 1212, and the tail end of pedestal 1211 is near going out
QI KOU 102, louvre 12112 is arranged near tail end.Herein, by the position of louvre 12112 is entered
Row optimal design-aside, both can improve the radiating effect of LASER Discharge Tube 122, again will not be to the accuracy of detection of product
Produce impact.
Preferably, seeing figures.1.and.2 in the lump shown, interior intracavity is further defined with for Laser emission assembly 12
Snapping in the draw-in groove 104 of location, draw-in groove 104 has the two groove sidewalls being oppositely arranged, pedestal 1211 towards two
The sidepiece of groove sidewall is designed with louvre 12112, and one of them groove sidewall is located at gas outlet 102 and draw-in groove 104
Between and this groove sidewall be provided with for connecting gas outlet 102 and the louvre 12112 near this groove sidewall
Dissipating vias 105.The setting of draw-in groove 104, can be beneficial to improve Laser emission assembly 12 further at laser
The steadiness installed in sensor body 1.The setting of dissipating vias 105 so that LASER Discharge Tube 122 works
The partial heat given out can discharge through dissipating vias 105, gas outlet 102 from louvre 12112,
Its excellent in heat dissipation effect.
Preferably, with reference to shown in Fig. 6, preposition diaphragm opening 12113 and rearmounted diaphragm in pedestal 1211, it are additionally provided with
Hole 12114, rearmounted diaphragm opening 12114 is between preposition diaphragm opening 12113 and cavity volume 12111.Herein,
Carry out limiting the beam size of laser beam by preposition diaphragm opening 12113 and rearmounted diaphragm opening 12114, can profit
In reducing scattering of light and interference.
Preferably, the power of LASER Discharge Tube 122 is 3mw~5mw, and the external diameter of LASER Discharge Tube 122 is
5mm~8mm, for this LASER Discharge Tube 122, uses condenser lens 123 that laser beam is converged in 15mm's
Position, now spot size and the angle of divergence size of test point is in suitably value, so that laser sensing
Accuracy and the stability of the value that device body 1 measurement obtains can be more preferably.As the present embodiment one is the most concrete
Embodiment, LASER Discharge Tube 122 selects external diameter to be 6mm, power is 3.6mw, wavelength is swashing of 650nm
Light-emitting tube 122.Of coursing, in concrete application, the parameter value of LASER Discharge Tube 122 is not limited to this.
Preferably, in the lump with reference to shown in Fig. 1, Fig. 2 and Fig. 7, laser sensor body 1 has interval phase
To the first sidepiece arranged and the second sidepiece, air inlet 101 is located at the first sidepiece, and gas outlet 102 is located at the
Two sidepieces, ventilating duct 103 includes that the first ventilation unit 1031 and the bending that extend along parallel first sidepiece are located at the
One ventilation unit 1031 one end and the second ventilation unit 1032 extended towards gas outlet 102 from the first sidepiece.This
Place, the first sidepiece and the second sidepiece are respectively front side portion and the rear lateral portion of laser sensor body 1.Herein,
First ventilation unit 1031 and the second ventilation unit 1032 connect formation one substantially L-shaped structure, so, phase
For existing U-shaped ventilating duct 103, can effectively reduce gas and flow to gas outlet 102 from air inlet 101
Flow through distance, thus be beneficial to improve the detection sensitivity of dust concentration sensor.
Preferably, the angle enclosing formation between the first ventilation unit 1031 and the second ventilation unit 1032 is obtuse angle,
So, can effectively reach to reduce air and flow to the gas outlet 102 and his like the purpose through distance from air inlet 101.
Of coursing, the angle enclosing formation between the first ventilation unit 1031 and the second ventilation unit 1032 is alternatively right angle,
Or, the transition turning between the first ventilation unit 1031 and the second ventilation unit 1032 can be smooth arc shape.
Preferably, in the lump shown in reference Fig. 1, Fig. 2 and Fig. 7, the second ventilation unit 1032 and gas outlet 102
Between be provided with a light barrier 110, the position away from the first ventilation unit 1031 of light barrier 110 is provided with several
For connecting the air-vent 1101 of the second ventilation unit 1032 and gas outlet 102.In concrete application, flow into logical
Air-flow in air channel 103 can flow at gas outlet 102 from air-vent 1101.Herein, by dust concentration
The internal structure of sensor optimizes design further, can effectively prevent ambient from shining sense from gas outlet 102
Situation on optical element 13 occurs, thus is beneficial to improve further the accuracy of detection of dust concentration sensor.
Preferably, in the lump with reference to shown in Fig. 1, Fig. 2 and Fig. 7, in laser sensor body 1, it is additionally provided with use
In the light trapping chamber 107 of absorption laser beam, light trapping chamber 107 has the accent connected with ventilating duct 103,
The convex windshied part being exposed in ventilating duct 103 of extension it is provided with at accent and in the position near air inlet 101 side.
Draw-in groove 104 and light trapping chamber 107 are respectively arranged on the two opposing lateral sides of ventilating duct 103 corner, accent and card
Groove 104 is just relative, and the laser beam that Laser emission assembly 12 is launched is irradiated into light trapping after ventilating duct 103
In chamber 107, photo-sensitive cell 13 is between Laser emission assembly 12 and light trapping chamber 107 and is positioned at ventilation
In road 103.The setting of windshied part, gets around during the intersection of bootable airflow passes ventilating duct 103 and accent
Light trapping chamber 107, thus the dust that effectively prevent in air-flow causes in accent entrance light trapping chamber 107
The phenomenon of light trapping chamber 107 dust stratification occurs, and then prevents owing to light trapping chamber 107 dust stratification causes laser ash
Dust concentration sensor light noise increases, the bad phenomenon of output result misalignment occurs.
Preferably, the wall in the frontage and airiness road 103 of windshied part is arc-shaped curved surface, so, can make to keep out the wind
Portion is mild to the guiding effectiveness comparison of air-flow, thus is beneficial to prevent air-flow from producing bigger impact at windshied part
And the pressure loss.Of coursing, in concrete application, the shape of windshied part is not limited to this, such as: the court of windshied part
Also tapered plane can be set to the wall of ventilating duct 103.
Specifically, the cavity wall in light trapping chamber 107 can use light absorbent to make, or, light trapping chamber 107
Cavity wall may be used without being formed by sub-optical processing again after non-light absorbent makes, both modes all can make
Light trapping chamber 107 has the effect absorbing laser beam.
Preferably, in the lump with reference to shown in Fig. 7 and Fig. 9, laser sensor body 1 also includes being located at gas outlet
102 or air inlet 101 at blower fan 16.The setting of blower fan 16, is mainly used in as laser sensor body
In 1, the flowing of air-flow provides and drives power.
Preferably, in the lump with reference to shown in Fig. 7, Fig. 9 and Figure 10, above-mentioned blower fan 16 is for being located at gas outlet
Air exhauster 16 at 102, circuit board 14 is provided with and dodges breach 142 for dodge air exhauster 16, takes out
Blower fan 16 is through dodging breach 142 and being installed at gas outlet 102, and air exhauster 16 is electrical with circuit board 14
Connecting, circuit board 14 can control air exhauster 16 startup optimization and out of service.During air exhauster 16 startup optimization,
It forms negative pressure, so that extraneous air can be from air inlet 101 in making ventilating duct 103 in the way of bleeding
Enter in laser sensor body 1, and final outflow at gas outlet 102 is swashed after ventilating duct 103 guides
Outside optical sensor body 1.
Preferably, in the lump with reference to shown in Fig. 1, Fig. 2, Fig. 8, Fig. 9 and Figure 11, main casing 11 includes the end
Shell 111 and top cover 112, top cover 112 is covered on drain pan 111 and is connected formation with drain pan 111 to be had interior
Chamber, air inlet 101, the main casing 11 of gas outlet 102.Herein, main casing 11 simple in construction, manufacturer
Just and be beneficial to its internal part (internal part includes being located at the Laser emission assembly 12 of interior intracavity, photosensitive unit
Part 13, critesistor 15 and circuit board 14 etc.) installation.
Specifically, in the lump with reference to shown in Fig. 7, Fig. 9 and Figure 10, circuit board 14 has towards drain pan 111
Bottom panel and top plate face towards top cover 112, Laser emission assembly 12, photo-sensitive cell 13 and heat
Quick resistance 15 be all preferably attached to the bottom panel of circuit board 14, photo-sensitive cell 13 and critesistor 15 from
The bottom panel of circuit board 14 extends convex being exposed in ventilating duct 103, so, is beneficial to improve the tight of product structure
Gathering property, the air being beneficial to again ensure to enter in laser sensor body 1 can first pass through photo-sensitive cell 13 and temperature-sensitive
Resistance 15 is just discharged outside laser sensor body 1.
Preferably, in the lump shown in reference Fig. 1, Fig. 2, Fig. 7, Fig. 8, Fig. 9 and Figure 11, air inlet 101
Being located on top cover 112, ventilating duct 103 is located on drain pan 111, and top cover 112 is provided with and air inlet 101
Laying respectively at the upper breach 1022 of the two opposing lateral sides of top cover 112, drain pan 111 is provided with and upper breach 1022
Para-position arranges and encloses the lower breach 1021 forming gas outlet 102 with upper breach 1022.Herein, by right
The position of air inlet 101, gas outlet 102 and ventilating duct 103 is optimized setting, can beneficially reduce laser
The volume of sensor body 1.
Preferably, the opening section area of air inlet 101 less than gas outlet 102 opening section area one
Half, so it is beneficial to ensure the smoothness that air-flow flows in laser sensor body 1.
Preferably, in the lump with reference to shown in Fig. 1, Fig. 7 and Fig. 8, drain pan 111 includes base plate 1110, header board
1111, back plate 1112, left plate 1113 and right panel 1114, header board 1111, back plate 1112, left plate 1113
The edge being arranged at base plate 1110 is bent respectively with right panel 1114.Lower breach 1021 is located at back plate
The end near left plate 1113 of 1112, ventilating duct 103 is from the turning of header board 1111 with right panel 1114
Place extends at the medium position of left plate 1113, and header board 1111 and left plate 1113 are located in light trapping chamber 107
Corner, draw-in groove 104 is arranged at the centre of drain pan 111 in the mode forming 45 degree of angles with header board 1111
Position.
Preferably, in the lump with reference to shown in Fig. 1, Fig. 2 and Fig. 7, drain pan 111 also include the first dividing plate 1115,
Second partition the 1116, the 3rd dividing plate the 1117, the 4th dividing plate the 1118, the 5th dividing plate 1119, the first dividing plate 1115
From the position of the close left plate 1113 of header board 1111, the inner side towards drain pan 11111 is bowing;The
Two dividing plates 1116 bend towards the bowing end of the first dividing plate 1115 at left plate 1113 and extend, and second
One end of dividing plate 1116 is connected in left plate 1113, the other end and the bowing end of the first dividing plate 1115
It is oppositely arranged in interval.The end that first dividing plate 1115 is relative with second partition 1116 forms light trapping chamber 107
Accent, the bowing end of the first dividing plate 1115 is above-mentioned windshied part, the first dividing plate 1115,
Two dividing plates 1116, left plate 1113 and header board 1111 enclose the above-mentioned light trapping chamber 107 of formation jointly.3rd every
Plate 1117 extends in drain pan 111 along the mode parallel with header board 1111 from right panel 1114, and the 3rd every
Having spacing between end away from right panel 1114 and the left plate 1113 of plate 1117, light barrier 110 is from left plate
The position of the close lower breach 1021 of 1113 is towards the end away from right panel 1114 of the 3rd dividing plate 1117
Bending extend, and one end of light barrier 110 be connected to back plate 1112 near lower breach 1021 position,
The end away from right panel 1114 of the other end and the 3rd dividing plate 1117 is that interval is oppositely arranged, the 4th dividing plate
1118 from the 3rd dividing plate 1117 away from right panel 1114 end by with header board 1111 in 45 degree of angles in the way of
Towards back to light trapping chamber 107 direction extend, the 5th dividing plate 1119 from light barrier 110 away from left plate 1113
End by with header board 1111 in 45 degree of angles in the way of towards back to light trapping chamber 107 direction extend, header board
1111, the first dividing plate 1115, second partition the 1116, the 3rd dividing plate 1117 and light barrier 110 enclose jointly
Forming above-mentioned ventilating duct 103, the 4th dividing plate 1118 and the 5th dividing plate 1119 enclose the above-mentioned draw-in groove of formation jointly
104, the i.e. the 4th dividing plate 1118 and the 5th dividing plate 1119 form the above-mentioned two groove sidewalls of draw-in groove 104, the 5th every
Plate 1119 is every the groove sidewall being located between draw-in groove 104 and gas outlet 102.
Preferably, the length of the 5th dividing plate 1119, more than the length of the 4th dividing plate 1118, so, can prevent
4th dividing plate 1118 blocks the louvre 12112 near it, thus is beneficial to fully ensure that LASER Discharge Tube 122
Radiating effect.
Preferably, in the lump with reference to shown in Figure 10 and Figure 11, top cover 112 includes 1121, four pieces of difference of top board
The side plate 1122 of edge of top board 1121 is located in bending and bending be connected to two adjacent side plates 1122 and with
This two adjacent side plates 1122 encloses the baffle plate 1123 forming air flowing lumen, and air inlet 101 is located at and is enclosed shape
Become on one block of side plate 1122 of air flowing lumen 106, circuit board 14 runs through and is provided with for connecting air stream
Cavity 106 and the passage 141 of ventilating duct 103.Air-flow enters air flowing lumen 106 from air inlet 101
In, after the barrier effect by baffle plate 1123, the flow direction of air-flow can be changed, flow at passage 141
In ventilating duct 103.After photo-sensitive cell 13 and critesistor 15 are all installed on the lower surface of circuit board 14,
Critesistor 15 is positioned at passage 141 and photo-sensitive cell 13 along air-flow flow direction in ventilating duct 103
Between, i.e. air-flow first flows through critesistor 15 after passage 141 enters in ventilating duct 103 and passes through photosensitive
Element 13, is so beneficial to preferably revise laser sensor body 1 according to the detected value of critesistor 15
Output result.
Preferably, in the lump with reference to shown in Fig. 1 and Fig. 9, above-mentioned dust concentration sensor also includes being packaged in
External conductive casing 2 outside laser sensor body 1 and being electrically connected between circuit board 14 and external conductive casing 2
Ground wire, drain pan 111 runs through and is provided with the cable-through hole 108 worn for ground wire.External conductive casing 2 concretely by
The shell 2 that conducting metal is made, which is provided with the air intake 21 arranged in inside and outside para-position with air inlet 101 and
The air vent (not shown) arranged in inside and outside para-position with gas outlet 102.Herein, by ground wire by circuit board
14 are electrically connected with external conductive casing 2, can play the effect of shielding interference, thus be beneficial to improve dust
The stability of concentration sensor.
The dust concentration sensor that this utility model embodiment provides, by setting in the front at photosensitive detection position
Put a bit of restricted flow passage, so that air-flow directly flows through photosensitive detection position by after restricted flow passage, detection
After further along side scatter so that detection air flow collection moderate improve, dust loss is greatly decreased, increase
The sensitivity of detection.Additionally, it offers heat radiation by pedestal 1211 tail end at Laser emission assembly 12
Hole 12112, offer dissipating vias 105 at the tail end of the 4th dividing plate 1118, thus LASER Discharge Tube 122 can be made
It is exposed, and the position being in close blower fan 16 is connected with gas outlet 102, thus play raising laser and send out
Penetrate the effect of pipe 122 radiating effect.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model,
All any amendment, equivalent or improvement etc. made within spirit of the present utility model and principle, all should
Within being included in protection domain of the present utility model.
Claims (10)
1. dust concentration sensor, including laser sensor body, described laser sensor body be provided with into
QI KOU, gas outlet and the ventilating duct being communicated between described air inlet and described gas outlet, described ventilation stage property
There is photosensitive detection position, it is characterised in that: it is additionally provided with flow restriction, described flow restriction in described ventilating duct
Arrange between described air inlet and described photosensitive detection position and near described photosensitive detection position.
2. dust concentration sensor as claimed in claim 1, it is characterised in that: described laser sensor is originally
Body includes having inner chamber, described air inlet, the main casing of described gas outlet and be located at the laser of described interior intracavity
Emitting module, photo-sensitive cell, circuit board, described interior intracavity defines described ventilating duct, described photo-sensitive cell
Being positioned at described ventilating duct, described Laser emission assembly launches laser beam, institute towards described photosensitive detection position
State flow restriction be located on described Laser emission assembly or be located on described main casing.
3. dust concentration sensor as claimed in claim 2, it is characterised in that: described Laser emission assembly
The LASER Discharge Tube that including mounting seat, is installed in described mounting seat and be located at described LASER Discharge Tube front end
Condenser lens, described mounting seat includes pedestal and extension is convexly equipped in described pedestal front from described pedestal top
Extension board, described extension board runs through be provided with described photo-sensitive cell just relative to detection hole, described current limliting tie
Structure is the current limliting plate that described extension board side is located in bending.
4. dust concentration sensor as claimed in claim 3, it is characterised in that: described pedestal is provided with confession
Cavity volume that described LASER Discharge Tube houses location with described condenser lens and the louvre connected with described cavity volume.
5. dust concentration sensor as claimed in claim 4, it is characterised in that: described pedestal have away from
The tail end of described extension board, described louvre is arranged near described tail end.
6. dust concentration sensor as claimed in claim 5, it is characterised in that: described interior intracavity is further defined by
Having the draw-in groove snapping in location for described Laser emission assembly, described draw-in groove has the two groove sidewalls being oppositely arranged,
Described pedestal be designed with described louvre towards the sidepiece of groove sidewall described in two, one of them described groove sidewall
It is located between described gas outlet with described draw-in groove and this groove sidewall is provided with for connecting described gas outlet with close
The dissipating vias of the described louvre of this groove sidewall.
7. the dust concentration sensor as described in any one of claim 1 to 6, it is characterised in that: described limit
Flow structure has the ventilation section metering hole less than described ventilating duct ventilation section.
8. the dust concentration sensor as described in any one of claim 1 to 6, it is characterised in that: described sharp
Optical sensor body has the first sidepiece and the second sidepiece that interval is oppositely arranged, and described air inlet is located at described
First sidepiece, described gas outlet is located at described second sidepiece, and described ventilating duct includes along parallel described first side
The first ventilation unit and bending that portion extends are located at described first ventilation unit one end and from described first sidepiece towards institute
State the second ventilation unit that gas outlet extends.
9. dust concentration sensor as claimed in claim 8, it is characterised in that: described first ventilation unit with
The angle enclosing formation between described second ventilation unit is obtuse angle, between described second ventilation unit and described gas outlet
Being provided with a light barrier, the position away from described first ventilation unit of described light barrier is provided with several for connecting
Described second ventilation unit and the air-vent of described gas outlet.
10. the dust concentration sensor as described in any one of claim 1 to 6, it is characterised in that: described
This internal temperature-sensitive electricity being additionally provided with for detecting this internal ambient temperature of described laser sensor of laser sensor
Resistance.
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CN201620481021.4U CN205643092U (en) | 2016-05-23 | 2016-05-23 | Dust concentration sensor |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111307680A (en) * | 2020-03-10 | 2020-06-19 | 深圳市宇驰环境技术有限公司 | Wearable device |
CN112461852A (en) * | 2020-11-06 | 2021-03-09 | 中广核核电运营有限公司 | Cleaning detection method, system, device, equipment and storage medium for circuit board |
-
2016
- 2016-05-23 CN CN201620481021.4U patent/CN205643092U/en active Active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111307680A (en) * | 2020-03-10 | 2020-06-19 | 深圳市宇驰环境技术有限公司 | Wearable device |
CN111307680B (en) * | 2020-03-10 | 2022-10-21 | 深圳市宇驰环境技术有限公司 | Wearable device |
CN112461852A (en) * | 2020-11-06 | 2021-03-09 | 中广核核电运营有限公司 | Cleaning detection method, system, device, equipment and storage medium for circuit board |
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