CN218412182U - Vehicle-mounted dust sensor - Google Patents
Vehicle-mounted dust sensor Download PDFInfo
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- CN218412182U CN218412182U CN202221911095.9U CN202221911095U CN218412182U CN 218412182 U CN218412182 U CN 218412182U CN 202221911095 U CN202221911095 U CN 202221911095U CN 218412182 U CN218412182 U CN 218412182U
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- air
- dust sensor
- vehicle
- pcb
- photoelectric conversion
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Abstract
The utility model provides an on-vehicle dust sensor includes: the air flow in the internal air passage passes through a heating part of the optical component. The air flow forms convection on two sides of the PCB, so that the heat dissipation mode is not limited to heat conduction, and the heat dissipation efficiency is further increased by forming convection on two sides of the PCB. And array holes are arranged on the PCB and used as filter screens for intercepting larger flock particles in the air.
Description
Technical Field
The utility model relates to a technical field that suspended particles detected particularly, relates to an on-vehicle dust sensor.
Background
The existing vehicle-mounted dust sensor is applied to an automobile after a device is replaced by a vehicle-specification device based on the principle of a household consumption-grade dust sensor. Compared with a household consumer-grade dust sensor, the vehicle-mounted dust sensor is often exposed to a high-temperature operation environment, so that the heat dissipation of the laser tube faces greater heat dissipation requirements. However, in the prior art, home consumer grade and vehicle mounted dust sensors conduct heat away through air, plastic housings with very low thermal conductivity. The mode has low heat dissipation efficiency, so that the power of the laser tube is attenuated after the laser tube runs for a long time, and the precision and the service life of the sensor are influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an on-vehicle dust sensor has effectively improved the radiating efficiency of sensor.
The embodiment of the utility model discloses a realize through following technical scheme:
an on-board dust sensor comprising: the air flow in the internal air passage passes through a heating part of the optical component.
Further, the heat generating portion includes: the tail and the pin end of the laser diode in the optical assembly.
Furthermore, the PCB is provided with array holes.
Further, the utility model discloses still include isolation component, a plurality of isolation component, shell and PCB board combination form inside air flue.
Furthermore, an air inlet and an air outlet are arranged on the shell, external air enters the internal air passage from the air inlet under the action of the pneumatic unit to form airflow, and the airflow sequentially passes through the array hole, the photoelectric conversion unit and the heating part of the optical assembly and is discharged from the air outlet.
Further, the photoelectric conversion unit is positioned below a region where the light beam emitted by the optical assembly meets the inner airway.
The utility model discloses technical scheme has following advantage and beneficial effect at least:
the utility model relates to an on-vehicle dust sensor, shell and PCB board combination form inside air flue, and the air current in the inside air flue is through the position that generates heat of optical assembly. The laser diode is arranged in the air channel on the premise that the opposite part in the sensor is sealed. The tail part and the pin end part of the laser diode in the optical component can be cooled by air through the airflow passing through the photoelectric conversion unit. Meanwhile, the air flow forms convection on two sides of the PCB, so that the heat dissipation mode is not limited to heat conduction, and convection heat dissipation is formed on two sides of the PCB, and the heat dissipation efficiency is further improved. And array holes are arranged on the PCB board and used as a filter screen for intercepting larger flock particles in the air.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is an external schematic view provided by the present invention;
fig. 2 is a schematic view illustrating an installation of an optical assembly provided by the present invention;
fig. 3 is a schematic diagram of heat dissipation of the end portion of the pin according to the present invention;
FIG. 4 is a schematic view of the flow direction of the air stream provided by the present invention;
icon: 1-shell, 11-air inlet, 12-air outlet, 2-pneumatic unit, 3-optical component, 31-laser diode, 4-PCB board, 41-first air guide hole, 42-second air guide hole, 43-array hole, 5-photoelectric conversion unit, 6-air flow, 61-first air flow, 62-second air flow, 7-isolation component, 8-pin end.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 to 4, a vehicle-mounted dust sensor includes: the pneumatic circuit comprises a shell 1, a pneumatic unit 2, an optical component 3, a photoelectric conversion unit 5, a PCB 4 and a circuit part, wherein an internal air channel is arranged between the shell 1 and the PCB 4. Can drive inside air flue through pneumatic unit 2 and form the air current, let the air current can accomplish the dust granule through photoelectric conversion unit 5 and detect, the air current also can take away the heat through the position that generates heat of optical component 3 simultaneously, realizes the heat dissipation to optical component. The pneumatic unit 2 can adopt a fan or other devices capable of realizing air flow; the housing 1 is provided with an air inlet 11 and an air outlet 12, and the pneumatic unit 2 can be arranged at the position of the air inlet or the position of the air outlet to realize the flow of air flow. The internal air channel can be formed by combining a plurality of isolation components 7 (which can be plates), the shell 1 and the PCB 4, but of course, other devices capable of forming air channels, such as pipes, etc., can be used.
In this embodiment, the optical component 3 emits laser light through the laser diode 31 therein, the light beam is shaped to form a focused light beam, a photoelectric conversion unit 5 is arranged below the focus of the light beam, and an air channel is arranged above the photoelectric conversion unit 5 in a direction perpendicular to and intersecting the light beam; then, when the pneumatic unit 2 works to drive air to pass through the photoelectric conversion unit 5 from an air channel, dust in the air can generate scattered light, the scattered light is captured by the photosensitive unit to generate pulse signals, and the rear-end circuit calculates the dust concentration in the air through a certain algorithm according to the pulse signals.
At this time, the laser diode 31 in the optical assembly 3, as a heating element, emits a large amount of heat at the tail and the pin end 8 thereof during operation, and the operating state thereof directly affects the accuracy and the lifetime of the sensor. If the laser diode 31 does not dissipate heat sufficiently during operation, the light efficiency of the laser diode 31 may be attenuated after a period of operation, and in severe cases, the laser diode 31 may be completely disabled.
The photoelectric conversion unit 5 is located below a region where the light beam emitted from the optical assembly 3 meets the internal airway. Through the arrangement of the internal air passage, external air can enter the internal air passage from the air inlet 11 under the action of the pneumatic unit 2 to form an air flow 6, and the air flow passes through the array hole 43, the photoelectric conversion unit 5 and the heat generating part of the optical component 3 in sequence and is discharged from the air outlet 12.
Because the utility model discloses be applied to on the car, if the air inlet to optical assembly 3 if the protection is not in place, after operation a period, inside photoelectric conversion unit 5 can the great flock granule of deposit, then directly leads to the sensitization unit signal of telecommunication saturation, and the sensor function is inefficacy. In the prior art, a filter screen is arranged at an air inlet of the sensor, but the manufacturing cost of the sensor is increased. An array of holes 43 is provided in the PCB 4. During the specific use, drive outer outside air by pneumatic unit 2 and get into shell 1 from air inlet 11, the guide through inside air flue carries out prefilter through array hole 43 with the flock in the outside air, comes the photoelectric conversion unit again and calculates out the dust concentration in the air.
The airflow 6 passes through the first air guide hole 41 to reach the other side of the PCB 4, and the guiding airflow 6 passing through the internal air passage is divided into two airflows, wherein one airflow performs air-cooling heat dissipation on the pin end (located on one side of the PCB 4) of the laser diode 31, and the other airflow passes through the second air guide hole 42 to perform air-cooling heat dissipation on the tail (located on the other side of the PCB 4) of the laser diode 31. The two air flows cool and radiate the heating part at two sides of the PCB 4 and form convection, so that the radiating mode is not limited to heat conduction and the radiating efficiency of the optical component 3 is increased.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An on-board dust sensor, comprising: the photoelectric conversion device comprises a shell (1), a pneumatic unit (2), an optical component (3), a photoelectric conversion unit (5), a PCB (printed circuit board) board (4) and a circuit part, and is characterized in that an internal air passage is arranged between the shell (1) and the PCB board (4), and air flow in the internal air passage passes through a heating position of the optical component (3).
2. The vehicle-mounted dust sensor according to claim 1, wherein the heat generating portion includes: a tail portion and a lead end portion (8) of a laser diode (31) in the optical assembly (3).
3. Vehicle dust sensor according to claim 2, characterized in that the PCB board (4) is provided with an array of holes (43).
4. Vehicle carried dust sensor according to claim 3, further comprising a spacer member (7), several of said spacer members (7), said housing (1) and said PCB board (4) combining to form said internal air duct.
5. The vehicle-mounted dust sensor according to claim 4, wherein an air inlet (11) and an air outlet (12) are provided on the housing (1), and external air enters the internal air passage from the air inlet (11) to form an air flow (6) under the action of the pneumatic unit (2), passes through the array hole (43), the photoelectric conversion unit (5) and the heat generating portion of the optical component (3) in sequence, and is discharged from the air outlet (12).
6. Vehicle-mounted dust sensor according to claim 5, characterized in that the photoelectric conversion unit (5) is located below the area where the light beam emitted by the optical assembly (3) meets the internal air duct.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022217838707 | 2022-07-12 | ||
| CN202221783870 | 2022-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218412182U true CN218412182U (en) | 2023-01-31 |
Family
ID=85014339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221911095.9U Active CN218412182U (en) | 2022-07-12 | 2022-07-22 | Vehicle-mounted dust sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218412182U (en) |
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2022
- 2022-07-22 CN CN202221911095.9U patent/CN218412182U/en active Active
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