Particle detection module

Abstract

The utility model discloses a particle detection module. The key point of the technical scheme is that the particle detection module comprises a main control circuit board, the fairing is fixed on the main control circuit board, and an air inlet and an air outlet are formed in the fairing; the laser shell is fixed on the main control circuit board and is positioned in the fairing; the fan is arranged in the fairing to drive air to flow and penetrate through the fairing; the laser light source is fixed in the laser shell and emits laser towards the interior of the fairing, and the laser penetrates through air flowing through the interior of the fairing; the silicon photocell is fixed on the main control circuit board and located in the fairing, the silicon photocell is used for receiving scattered light rays disturbed by particles, and the silicon photocell is electrically connected with the main control circuit board; the laser light source, the silicon photocell and the fairing are integrated on the main control circuit board, so that the size of the detection module is reduced, the structure of the detection module is simplified, and the detection module is convenient to move.

Description

Technical Field

[0001] This utility model relates to the technical field of particle detection, and more specifically, to a particle detection module. Background Technology

[0002] Particulate matter detection, also known as dust detection or PM2.5 detection, is mainly used to detect particulate matter with a diameter of ≤2.5 micrometers in the air. These particles can remain suspended in the air for a long time, and when the concentration of these particles in the air is high, they can easily cause harm to people with respiratory diseases or dust allergies.

[0003] In the existing technology, there are already related particle laser detection modules. However, the laser emitter, air flow channel and detector of the existing laser detection modules are mostly set up separately, which has the problems of large size, complex structure and inconvenience of movement. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a particle detection module, which reduces the size of the detection module and simplifies the structure of the detection module by integrating the laser light source, silicon photocell and rectifier on the main control circuit board, making the detection module easier to move.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a particle detection module, including a main control circuit board;

[0006] A fairing, which is fixed on the main control circuit board, is provided with an air inlet and an air outlet;

[0007] A laser housing, which is fixed to the main control circuit board and located inside the shroud;

[0008] A fan, which is disposed inside the fairing to drive airflow through the fairing;

[0009] A laser source is fixed inside a laser housing and emits laser light toward the shroud, the laser light passing through the air flowing inside the shroud;

[0010] And a silicon photovoltaic cell, which is fixed on the main control circuit board and located inside the rectifier, the silicon photovoltaic cell is used to receive the light scattered after being disturbed by particles, and the silicon photovoltaic cell is electrically connected to the main control circuit board.

[0011] The present invention is further configured such that: an air flow channel is provided inside the shroud, and the two ends of the air flow channel are an air inlet and an air outlet, respectively;

[0012] The fairing is provided with a mounting groove that extends through the fairing to one side and passes through the airflow channel. The laser housing is installed in the mounting groove.

[0013] The present invention is further configured such that: the laser housing includes a mounting part, the mounting part is located at one end of the laser housing that protrudes from the housing, and the laser source is mounted on the mounting part;

[0014] The conductive part is provided with a channel through which the laser emitted by the laser source passes;

[0015] The device includes a detection unit, which comprises a flow space communicating with an air channel and a detection space located below the flow space. The flow space and the detection space are provided with holes for scattered light to pass through, and the silicon photocell is disposed in the detection space.

[0016] The present invention is further configured such that: the detection part is configured as a horizontally arranged plate-shaped structure; the space between the detection part and the shroud located above the detection part is a flow space; the space between the detection part and the main control circuit board located below the detection part is a detection space; and the plate-shaped structure of the detection part is provided with a vertically penetrating hole to allow scattered light to enter the lower part of the detection part from the upper part of the detection part.

[0017] The present invention is further configured such that: the laser housing also includes an extinction part, the extinction part is provided with an extinction cavity, the extinction cavity is provided with an entrance hole on the side near the detection part, the entrance hole allows light passing through the detection part to enter the extinction cavity, the extinction cavity is provided with a reflective surface, the reflective surface is provided with an inclined surface, the side of the extinction cavity opposite to the reflective surface is provided with an extinction surface, the side of the reflective surface away from the detection part is inclined towards the direction close to the extinction surface, the reflective surface is used to reflect the light incident only into the extinction cavity onto the extinction surface, and the extinction surface is provided with a plurality of bent parts protruding towards the reflective surface.

[0018] The present invention is further configured such that: the laser source and the mounting part are interference-fitted together, and the laser housing and the shroud are clearance-fitted together.

[0019] The present invention is further configured such that the laser housing and the rectifier are fixed to the main control circuit board by screws.

[0020] The present invention is further configured such that: the laser source is a laser emitter, and the laser emitted by the laser emitter has a wavelength of 400-700nm.

[0021] In summary, the present invention has the following advantages over the prior art: by integrating the laser light source, silicon photocell, and rectifier onto the main control circuit board, the present invention reduces the size of the detection module, simplifies the structure of the detection module, and facilitates the movement of the detection module. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the embodiment;

[0023] Figure 2 This is a schematic diagram illustrating the air vent in an embodiment;

[0024] Figure 3 This is a schematic diagram illustrating the specific structure of the laser housing in an embodiment;

[0025] Figure 4 for Figure 3 Enlarged schematic diagram of part A.

[0026] In the diagram: 1. Main control circuit board; 2. Shaft; 21. Air inlet; 22. Air outlet; 23. Mounting slot; 3. Fan; 4. Laser housing; 41. Mounting part; 42. Conducting part; 43. Detection part; 44. Matting part; 441. Entrance hole; 442. Reflecting surface; 443. Matting surface; 5. Laser source; 6. Silicon photovoltaic cell. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0028] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0029] Example: A particle detection module, see appendix. Figure 1 -Appendix Figure 4 The system includes a main control circuit board 1, a shroud 2, a laser housing 4, a fan 3, a laser light source 5, and a silicon photovoltaic cell 6. The shroud 2 is fixed to the main control circuit board 1 and has an air inlet 21 and an air outlet 22. The laser housing 4 is fixed to the main control circuit board 1 and located inside the shroud 2. The fan 3 is located inside the shroud 2 to drive airflow through the shroud 2. The laser light source 5 is fixed inside the laser housing 4 and emits laser light towards the inside of the shroud 2, and the laser light passes through the air flowing inside the shroud 2. The silicon photovoltaic cell 6 is fixed to the main control circuit board 1 and located inside the shroud 2. The silicon photovoltaic cell 6 is used to receive the light scattered after being disturbed by particles, and the silicon photovoltaic cell 6 is electrically connected to the main control circuit board 1.

[0030] The laser source 5, silicon photovoltaic cell 6, and rectifier 2 are integrated on the main control circuit board 1, which reduces the size of the detection module, simplifies the structure of the detection module, and facilitates the movement of the detection module.

[0031] When in use, air enters the shroud 2 through the air inlet 21 under the action of the fan 3, and then flows out through the air outlet 22 of the shroud 2. The laser emitted by the laser source 5 passes through the air flowing through the shroud 2. When the particles in the air pass through the laser beam, due to the large size of the particles, they will disturb the beam and cause scattering. The beam is scattered to the silicon photodiode 6 and detected by the silicon photodiode 6. Thus, the silicon photodiode 6 can transmit electrical signals to the main control circuit board 1.

[0032] Specifically, the main control circuit board 1 is connected to the laser light source 5 and the fan 3 to provide power to the laser light source 5 and the fan 3.

[0033] Specifically, an airflow channel is provided inside the shroud 2, with an air inlet 21 and an air outlet 22 at its two ends; a mounting groove 23 is provided on the shroud 2, extending through the shroud 2 to one side, and the mounting groove 23 passes through the airflow channel, with the laser housing 4 installed in the mounting groove 23.

[0034] Specifically, the laser housing 4 includes a mounting part 41, a conducting part 42, and a detection part 43. The mounting part 41 is located at the end of the laser housing 4 that is exposed, and the laser light source 5 is mounted on the mounting part 41. The conducting part 42 is provided with a channel through which the laser emitted by the laser light source 5 passes. The detection part 43 includes a flow space communicating with the air flow channel and a detection space located below the flow space. The flow space and the detection space are provided with holes through which scattered light passes. The silicon photodiode 6 is disposed in the detection space.

[0035] Specifically, the detection unit 43 is configured as a horizontally arranged plate-like structure. The space between the detection unit 43 and the shroud 2 located above the detection unit 43 is a flow space. The space between the detection unit 43 and the main control circuit board 1 located below the detection unit 43 is a detection space. The plate-like structure of the detection unit 43 is provided with a vertical hole that penetrates the plate-like structure so that scattered light can enter the detection unit 43 from above and below.

[0036] Specifically, the laser housing 4 also includes an extinction section 44, which has an extinction cavity. An entrance hole 441 is provided on the side of the extinction cavity near the detection section 43. The entrance hole 441 allows light passing through the detection section 43 to enter the extinction cavity. A reflective surface 442 is provided in the extinction cavity. The reflective surface 442 is an inclined surface. The side of the extinction cavity opposite to the reflective surface 442 is an extinction surface 443. The side of the reflective surface 442 away from the detection section 43 is inclined toward the direction close to the extinction surface 443. The reflective surface 442 is used to reflect the light incident only in the extinction cavity onto the extinction surface 443. The extinction surface 443 has several bent portions protruding toward the reflective surface 442.

[0037] By setting the extinction section 44, it is possible to prevent laser light from being reflected onto the silicon photovoltaic cell 6 and causing signal interference.

[0038] Specifically, the laser source 5 is interference-fitted with the mounting part 41, and the laser housing 4 is clearance-fitted with the shroud 2.

[0039] Specifically, the laser housing 4 and the shroud 2 are fixed to the main control circuit board 1 with screws.

[0040] Specifically, the laser source 5 is a laser emitter, and the laser emitted by the laser emitter has a wavelength of 400-700nm.

[0041] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A particulate detection module characterized by: The main control circuit board (1) is provided with a main control circuit board (1); The rectifier cover (2) is fixed on the main control circuit board (1), and the rectifier cover (2) is provided with an air inlet (21) and an air outlet (22); The laser shell (4) is fixed on the main control circuit board (1) and located in the rectifier cover (2); The fan (3) is arranged in the rectifier cover (2) to drive the air flow through the rectifier cover (2); The laser light source (5) is fixed in the laser shell (4) and emits laser towards the rectifier cover (2), and the laser passes through the air flowing through the rectifier cover (2); And the silicon photocell (6) is fixed on the main control circuit board (1) and located in the rectifier cover (2), which is used for receiving scattered light disturbed by particles, and the silicon photocell (6) is electrically connected with the main control circuit board (1).

2. A particle detection module according to claim 1, wherein: The rectifier cover (2) is provided with an air flow channel, and the air flow channel has an air inlet (21) and an air outlet (22) at both ends; The rectifier cover (2) is provided with a mounting groove (23) penetrating the rectifier cover (2) towards one side of the rectifier cover (2), the mounting groove (23) penetrates the air flow channel, and the laser shell (4) is mounted in the mounting groove (23).

3. A particle detection module according to claim 2, wherein: The laser shell (4) includes a mounting portion (41) located at one end of the laser shell (4) exposed from the shell, and the laser light source (5) is mounted in the mounting portion (41); The conducting portion (42) is provided with a channel for the laser emitted by the laser light source (5) to pass through; And the detection portion (43) includes a flow-through space in communication with the air flow channel and a detection space located below the flow-through space, the flow-through space and the detection space are provided with holes for the scattered light to pass through, and the silicon photocell (6) is arranged in the detection space.

4. A particle detection module according to claim 3, wherein: The detection portion (43) is arranged in a horizontally arranged plate structure, the space between the detection portion (43) and the rectifier cover (2) located above the detection portion (43) is the flow-through space, the space between the detection portion (43) and the main control circuit board (1) located below the detection portion (43) is the detection space, and the plate structure of the detection portion (43) is provided with holes vertically penetrating the plate structure for the scattered light to enter from above the detection portion (43) to below the detection portion (43).

5. A particle detection module according to claim 3, wherein: The laser shell (4) further comprises an extinction part (44) provided with an extinction cavity, the extinction cavity is provided with an incident hole (441) near the detection part (43), the incident hole (441) is used for the light passing through the detection part (43) to enter the extinction cavity, the extinction cavity is provided with a reflecting surface (442), the reflecting surface (442) is provided as an inclined surface, the side of the extinction cavity opposite to the reflecting surface (442) is provided as an extinction surface (443), the reflecting surface (442) is provided as an inclined surface away from the detection part (43) and towards the extinction surface (443), the reflecting surface (442) is used for reflecting the light in the extinction cavity to the extinction surface (443), and the extinction surface (443) is provided with a plurality of bending parts protruding towards the reflecting surface (442).

6. A particle detection module according to claim 3, wherein: The laser light source (5) is interference fit with the mounting part (41), and the laser shell (4) is clearance fit with the fairing (2).

7. A particle detection module according to claim 6, wherein: The laser shell (4) and the fairing (2) are fixed on the main control circuit board (1) by screws.

8. The particulate detection module of claim 1, wherein: The laser light source (5) is a laser emitter, and the wavelength of the laser emitted by the laser emitter is 400-700nm.

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