CN208206739U - A kind of particle concentration detection device - Google Patents
A kind of particle concentration detection device Download PDFInfo
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- CN208206739U CN208206739U CN201820945985.9U CN201820945985U CN208206739U CN 208206739 U CN208206739 U CN 208206739U CN 201820945985 U CN201820945985 U CN 201820945985U CN 208206739 U CN208206739 U CN 208206739U
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Abstract
The utility model discloses a kind of particle concentration detection devices that testing result accuracy is high, including closed shell, shell is equipped with air inlet and air outlet, blower is equipped in air inlet in shell, blower is connected with the lighttight defeated windbend pipe of setting in the housing, measurement zone is equipped in the end of defeated windbend pipe in shell, corresponding at measurement zone in shell equipped with light source and collimation focusing unit, scattering light collector is equipped in measurement zone, the other end of measurement zone is equipped with lighttight outlet air bend pipe, and outlet air bend pipe is connected with air outlet；It is equipped with reflective mirror far from the side of light source in measurement zone in shell, the light absorption room for absorbing mirror reflection light is equipped in shell, light absorption room includes the cabinet that inner wall is covered with black light-absorbing dope layer, and cabinet is equipped with light import.
Description
Technical field
The utility model relates to a kind of particle concentration detection devices.
Background technique
Particle concentration detection device based on light scattering principle the application of civilian and industrial circle for a long time, for qualitative or
Particulate matter situation in person's quantitative detection environment, such as part dust sensor, PM2.5 sensor, smoke alarm etc., it is such
The principle of device can be briefly described are as follows: light is the medium for detecting dust, and particulate matter can scatter light, of different size and form
Grain has different scattering light characteristics.If a large amount of particulate matters are equivalent to the different isotropic bead of many partial sizes, Michaelis
Scattering theory give isotropic uniform dielectric bead scattered optical field under the conditions of parallel light Space Angle distribution with
Relationship between sphere diameter, by the particle scattered light signal of some collected angle, by relevant data processing algorithm
Calculate particle diameter and number, further calculate out the concentration value of particulate matter.
Although particle concentration detection device has had many applications, but still there is many problems.For example, some
Occasion is thinner to the thickness requirement of detection device, in order to install, saves space；In another example interference problem because design or
The reason of installation, causes extraneous light to enter device internal measurement area and causes interference to measurement；In addition, light scattering measurement
Useful signal be particulate matter scattering optical signal, but scattered light signal is generally relatively weak, when testing light source irradiates measurement zone,
Only fraction light intensity is scattered by particulate matter, and most light intensity, which can pass through measurement zone, becomes transmitted light, and transmitted light is irradiated to survey
When measuring the subsequent mechanical structure in area, reflection can be generated, reflected light is turned back to measurement zone, will be generated and be interfered to measurement, to produce
Raw error, such as transmitted light are saturated the optical device for receiving particulate matter scattering light in advance, cause be high particle concentration illusion；
In addition to this, temperature is also to cause a key factor of measurement error, because the environment temperature of installation site changes, or
Person's light source working overlong time causes optical scattering measuring system temperature to increase, and can all influence the accuracy of measurement result, especially
When temperature change is larger, influencing also can be bigger.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of inspections of particle concentration that testing result accuracy is high
Survey device.
In order to solve the above technical problems, the technology employed by the present utility model is a kind of particle concentration detection dress
It sets, including closed shell, shell is equipped with air inlet and air outlet, and shell is interior to be equipped with blower, blower and setting in air inlet
Lighttight defeated windbend pipe in the housing is connected, and is equipped with measurement zone in the end of defeated windbend pipe in shell, shell is interior right
It should be equipped with light source and collimation focusing unit at measurement zone, scattering light collector is equipped in measurement zone, the other end of measurement zone is set
There is lighttight outlet air bend pipe, outlet air bend pipe is connected with air outlet；It is equipped with instead in measurement zone far from the side of light source in shell
Light microscopic, shell is interior to be equipped with the light absorption room for absorbing mirror reflection light, and light absorption room includes that inner wall is covered with black light-absorbing coating
The cabinet of layer, cabinet are equipped with light import.
As a preferred solution, the blower is turbofan, and the air intake surface of turbofan and outlet air surface are mutual
Vertically.
As a preferred solution, the outlet air bend pipe caliber is gradually increased along air-out direction.
As a preferred solution, the outlet section flare of the outlet air bend pipe.
As a preferred solution, the defeated windbend pipe and outlet air bend pipe are all S-shaped structure.
As a preferred solution, temperature sensor is equipped in the shell.
As a preferred solution, reflective mirror setting is by the measurement zone at 5-8cm.
As a preferred solution, the reflective mirror mirror surface and from measurement zone come out transmitted light between angle be less than
40°。
The beneficial effects of the utility model are: since the light intensity for only having a small amount of light source to project becomes scattering by particulate matter scattering
Light, a large amount of light intensity can penetrate measurement zone as transmitted light, and transmitted light is irradiated to the subsequent mechanical structure of measurement zone, can generate anti-
It penetrates, reflected light is turned back to measurement zone, will generate interference to measurement, for example make the scattering light collector for receiving particulate matter scattering light
Be saturated in advance, cause be high particle concentration illusion, so shell in measurement zone far from light source side be equipped with reflective mirror,
The light absorption room for absorbing mirror reflection light is equipped in shell, light absorption room includes the case that inner wall is covered with black light-absorbing dope layer
Body, cabinet is equipped with light import, after transmitted light enters light absorption room, by multiple reflection and absorption, the light of " race " out
Become very faint by force, is not enough to generate interference to the scattering measuring system of measurement zone.
Common axial flow blower air intake surface is parallel with outlet air surface, detection device space needed for thickness direction be axial flow blower with
The sum of the installation space of defeated windbend pipe, and turbofan is used in the present apparatus, and the air intake surface of turbofan and outlet air surface are mutual
Vertically, so that defeated windbend pipe is directly connected thereto from blower side, to reduce installation space needed for entirety, so that particulate matter is dense
Degree detection device can design it is thinner, in order to install, save space.
Due to by lighttight defeated windbend pipe and outlet air bend pipe delivery air, effectively prevent extraneous light by into
Wind cavity enters measurement zone, so that measurement result is more accurate.
The outlet air bend pipe caliber is gradually increased along air-out direction, is increased the cross-sectional area of cavity, is reduced air outlet
Wind speed, advantageously reduce noise.
The outlet section flare of the outlet air bend pipe, can further decrease the wind speed of air outlet, advantageously reduce noise.
The defeated windbend pipe and outlet air bend pipe are all S-shaped structure, further ensure that not extraneous light passes through air inlet
Cavity enters measurement zone, so that measurement result is more accurate, while allowing air-flow to be able to achieve stable transition when flowing through bend,
Be conducive to the stability of measurement.
Be equipped with temperature sensor in the shell, processing amendment can be carried out to detection data according to temperature, reduce because
Error caused by variation of ambient temperature.
Reflective mirror setting place 5-8cm by measurement zone, can make light as much as possible enter light absorption room, so that examining
It is more accurate to survey result.
The reflective mirror mirror surface and from measurement zone come out transmitted light between angle less than 40 °, may make into light absorption
Even if the light of room has very little part to project after multiple reflections, will not reflex at measurement zone causes to influence measurement result.
Detailed description of the invention
Fig. 1 is the schematic view of the front view of the utility model.
In Fig. 1: shell 1-0, blower 1-1, air inlet 1-2, defeated windbend pipe 1-3, outlet air bend pipe 1-4, air outlet 1-5 are surveyed
Area 1-6, light source 1-7, collimation focusing unit 1-8 are measured, light collector 1-9, reflection light 1-10, reflecting mirror 1-11, light are scattered
Import 1-12, light absorption room 1-13.
Specific embodiment
With reference to the accompanying drawing, the specific embodiment of the utility model is described in detail.
As shown in Figure 1, a kind of particle concentration detection device, including closed shell 1-0, shell 1-0 are equipped with air inlet
It is equipped with turbofan 1-1 in 1-2 and air outlet 1-5, shell 1-0 air inlet 1-2 at, the air intake surface of turbofan 1-1 and out
Wind face is mutually perpendicular to.
Blower 1-1 is connected with the defeated windbend pipe 1-3 of the lighttight S-shaped being arranged in shell 1-0, defeated in shell 1-0
The end of windbend pipe 1-3 is equipped with tubulose measurement zone 1-6, and shell 1-0 is equipped with light source 1-7 and collimation focusing list at measurement zone 1-6
The other end that scattering light collector 1-9, measurement zone 1-6 are equipped in first 1-8, measurement zone 1-6 is equipped with lighttight S-shaped outlet air bend pipe
1-4, outlet air bend pipe 1-4 are connected with air outlet 1-5；Outlet air bend pipe 1-4 caliber is gradually increased along air-out direction, outlet air bend pipe 1-
4 outlet section flare.Reflective mirror 1-11, reflective mirror 1-11 are equipped with far from the side of light source in measurement zone 1-6 in shell 1-0
Setting is by the measurement zone 1-6 at 5cm.The reflective mirror 1-11 mirror surface and from measurement zone 1-6 come out transmitted light between angle be
30°.The light absorption room 1-13 for absorbing reflective mirror 1-11 reflection light 1-10 is equipped in shell 1-0, light absorption room 1-13 includes interior
Wall is covered with the cabinet of black light-absorbing dope layer, and cabinet is equipped with light import 1-12.Temperature sensor is equipped in the shell 1-0
(not shown).
Measurement zone 1-6 is the region of particulate matter light scattering measurement, and sampling air flow passes through measurement zone 1-6, and light source 1-7 is by quasi-
Straight focusing unit 1-8, is irradiated to measurement zone 1-6, the particulate matter of measurement zone 1-6 produces scattering, the scattering light of particulate matter to light
It is acquired in some angle by scattering light collector 1-9, scattered light signal passes through photoelectric conversion, then calculates through relevant data processing
Method, can calculate particle diameter.
The principles and effects of the invention, and the implementation that part uses only is illustrated in the above embodiments
Example, rather than limits the present invention；It should be pointed out that for those of ordinary skill in the art, not departing from this hair
Under the premise of bright concept, various modifications and improvements can be made, and these are all within the protection scope of the present invention.
Claims (8)
1. a kind of particle concentration detection device, including closed shell, shell is equipped with air inlet and air outlet, in shell into
Blower is equipped at air port, it is characterised in that: blower is connected with setting lighttight defeated windbend pipe in the housing, shell it is interior
The end of defeated windbend pipe is equipped with measurement zone, is corresponding at measurement zone in shell equipped with light source and collimation focusing unit, measurement zone
Interior to be equipped with scattering light collector, the other end of measurement zone is equipped with lighttight outlet air bend pipe, and outlet air bend pipe is connected with air outlet；
It is equipped with reflective mirror far from the side of light source in measurement zone in shell, is equipped with the light absorption for absorbing mirror reflection light in shell
Room, light absorption room include the cabinet that inner wall is covered with black light-absorbing dope layer, and cabinet is equipped with light import.
2. a kind of particle concentration detection device as described in claim 1, it is characterised in that: the blower is turbofan,
And the air intake surface and outlet air surface of turbofan are mutually perpendicular to.
3. a kind of particle concentration detection device as claimed in claim 2, it is characterised in that: the outlet air bend pipe caliber edge goes out
Wind direction is gradually increased.
4. a kind of particle concentration detection device as claimed in claim 3, it is characterised in that: the outlet section of the outlet air bend pipe
Flare.
5. a kind of particle concentration detection device as claimed in claim 4, it is characterised in that: the defeated windbend pipe and out windbend
Guan Douwei S-shaped structure.
6. a kind of particle concentration detection device according to any one of claims 1 to 5, it is characterised in that: in the shell
Equipped with temperature sensor.
7. a kind of particle concentration detection device as claimed in claim 6, it is characterised in that: the reflective mirror setting is measuring
By area at 5-8cm.
8. a kind of particle concentration detection device as claimed in claim 7, it is characterised in that: the reflective mirror mirror surface with from survey
The angle between the transmitted light that area comes out is measured less than 40 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820945985.9U CN208206739U (en) | 2018-06-20 | 2018-06-20 | A kind of particle concentration detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820945985.9U CN208206739U (en) | 2018-06-20 | 2018-06-20 | A kind of particle concentration detection device |
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| Publication Number | Publication Date |
|---|---|
| CN208206739U true CN208206739U (en) | 2018-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820945985.9U Active CN208206739U (en) | 2018-06-20 | 2018-06-20 | A kind of particle concentration detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680476A (en) * | 2018-06-20 | 2018-10-19 | 苏州百创达环保科技有限公司 | A kind of particle concentration detection device |
-
2018
- 2018-06-20 CN CN201820945985.9U patent/CN208206739U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680476A (en) * | 2018-06-20 | 2018-10-19 | 苏州百创达环保科技有限公司 | A kind of particle concentration detection device |
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