High-precision dust sensor

Abstract

The utility model relates to a high-precision dust sensor. The dust sensor comprises a light-emitting component, a light-receiving component and a dust channel. The dust channel comprises a dust inlet bin, a transition bin, a detection bin and a dust outlet bin; the air inlet bin and the air outlet bin are transversely arranged; the detection bin is vertically arranged; the light-emitting component and the light-receiving component are arranged on the two sides of the transition bin. The light-emitting component comprises a light-emitting bin and a light-emitting element. The light receiving component comprises a light receiving bin and a light receiving element; a shielding rod is arranged in the detection bin; the shielding rod is arranged between the light-emitting element and the light-receiving element and shields light emitted by the light-emitting element. According to the utility model, the light path structure between the light emitting component and the light receiving component is simplified, the structure of the whole dust sensor is miniaturized, the installation requirement of the dust sensor is reduced, and popularization and application are facilitated; when air to be detected enters the transition bin from the air inlet bin and enters the air outlet bin from the detection bin, turning needs to be conducted once, external light isolation is formed, and it is avoided that external light enters the detection bin from the air inlet bin and the air outlet bin to interfere the detection result.

Description

Technical Field

[0001] This utility model relates to the technical field of dust sensors, and in particular to a high-precision dust sensor. Background Technology

[0002] Dust sensors are classified into photoelectric dust sensors and electrical dust sensors according to their working principle. Photoelectric dust sensors are the most widely used. The working principle of a photoelectric dust sensor is based on the principle of light scattering. A photoelectric dust sensor includes a light-emitting element, a light-receiving element, and a dust channel. Dust flows along the dust channel; the light-emitting element emits light, which is scattered by the dust, thus altering the light signal received by the light-receiving element. In existing dust sensors, the paths of the light emitted by the light-emitting element and the light received by the light-receiving element form a zigzag shape. The dust channel passes through the inflection point of this zigzag shape, where the light emitted by the light-emitting element is scattered by the dust. This is to prevent the direct light from the light-emitting element from mixing with the scattered light, which would then be received by the light-receiving element and converted into an incorrect electrical signal. This necessitates that more space be reserved in the initial design of the dust sensor to accommodate the diagonally placed light-emitting and light-receiving elements, as well as the optical path between them. This results in a larger overall size of the dust sensor, requiring more space for installation, which is not conducive to widespread application. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a high-precision dust sensor.

[0004] The technical solution of this utility model is as follows: a high-precision dust sensor, including a light-emitting component, a light-receiving component, and a dust channel; the dust channel includes a dust inlet chamber, a transition chamber, a detection chamber, and a dust outlet chamber connected sequentially from bottom to top; dust enters the high-precision dust sensor through the dust inlet chamber, then passes through the transition chamber and the detection chamber sequentially, and is discharged from the dust outlet chamber; the dust concentration is detected in the detection chamber; the light-emitting component and the light-receiving component are respectively arranged on both sides of the transition chamber, forming the basic components for dust concentration detection; the light-emitting component includes a light-emitting chamber and a light-emitting element; the light-emitting element is arranged inside the light-emitting chamber and emits light to the right; the right side of the light-emitting chamber is connected to the detection chamber; the light-receiving component includes a light-receiving chamber and a light-receiving element; the light-receiving element is arranged inside the light-receiving chamber and receives light emitted from the left; a shielding rod is provided inside the detection chamber; the shielding rod is arranged between the light-emitting element and the light-receiving element to block the light emitted from the light-emitting element, preventing direct light from the light-emitting element from directly entering the light-receiving element, while allowing scattered light to reach the light-receiving element, ensuring the detection accuracy of the dust sensor and saving the arrangement space of the light-emitting component and the light-receiving component.

[0005] Preferably, both the air inlet and outlet chambers are arranged horizontally; the detection chamber is arranged vertically; the air to be tested needs to make a turn when entering the transition chamber from the air inlet chamber and when entering the outlet chamber from the detection chamber, forming a physical barrier against external light, so as to prevent external light from entering the detection chamber from the air inlet and outlet chambers and interfering with the detection results.

[0006] Preferably, the high-precision dust sensor further includes a housing and a substrate; the housing includes a front shell and a rear shell; the front shell and the rear shell sandwich the substrate in the middle; a dust inlet chamber and a transition chamber are disposed between the front shell and the substrate; a light-emitting chamber, a light-receiving chamber, a detection chamber, and a dust outlet chamber are disposed between the front shell and the rear shell; a light-emitting element and a light-receiving element are mounted on the front side of the substrate; the high-precision dust sensor forms a structure that is easy to install.

[0007] Preferably, the light-emitting component further includes lens A; lens A is disposed between the light-emitting element and the shielding rod; the light-receiving component further includes lens B; lens B is disposed between the shielding rod and the light-receiving element; the light-emitting element is located at the focal point of lens A, which is beneficial for converting the light emitted by the light-emitting element into parallel light, making it easier to capture dust flowing through the detection chamber; the light-receiving element is located at the focal point of lens B, which is beneficial for focusing the light entering the light-receiving chamber onto the light-receiving element, thereby improving the detection accuracy of the dust sensor.

[0008] Preferably, the shielding rod has an arc surface on the side facing the light-receiving element; the reflected light from the light-emitting element is scattered onto the arc surface and will not be reflected back to the light-receiving element, thus eliminating stray light entering the light-receiving element; the arc surface can create a smooth flow without interfering with the airflow and can be used for stable detection.

[0009] Preferably, a heating element is provided on the substrate; the heating element is located at the bottom of the transition chamber and serves as the driving force for the airflow to be measured.

[0010] Furthermore, the lower end of the front housing is provided with a dust inlet communicating with the dust inlet chamber to facilitate dust entering the dust sensor; the upper end of the front housing is provided with a dust outlet communicating with the dust outlet chamber to facilitate dust leaving the dust sensor.

[0011] Furthermore, the dust inlet chamber is connected to the bottom left side of the transition chamber; the air to be tested flowing into the transition chamber makes a turn; the dust outlet chamber is connected to the top right side of the detection chamber; the air to be tested flowing into the dust outlet chamber makes a turn; this provides better isolation from external light.

[0012] Furthermore, the front shell has an inner recess A corresponding to the detection chamber position; the rear shell has an inner recess B corresponding to the detection chamber position; the distance between the inner recess A and the inner recess B, and the distance between the inner wall of the front shell and the front wall of the substrate are equal, so that the gas in the transition chamber flows steadily into the detection chamber, ensuring the detection accuracy of the dust sensor.

[0013] Furthermore, the concave plate facing the transition chamber is provided with a guide slope plate to guide the gas smoothly into the detection chamber.

[0014] Preferably, the detection chamber is located at the top center of the transition chamber to ensure that the transition chamber fully absorbs external light and reduces the interference of external light on dust detection.

[0015] Preferably, the right end of the light-emitting chamber is provided with a slit structure corresponding to the light-emitting element; the stray light emitted by the light-emitting element is diffusely reflected in the slit structure, which can reduce the stray light incident on the light-receiving element.

[0016] The beneficial effects of this utility model are as follows: The high-precision dust sensor of this utility model has the following advantages:

[0017] (1) This utility model simplifies the optical path structure between the light-emitting component and the light-receiving component, so as to make the structure of the entire dust sensor more miniaturized, reduce the installation requirements of the dust sensor, and facilitate its application. The air to be tested needs to turn once when it enters the transition chamber from the air inlet chamber and when it enters the air outlet chamber from the detection chamber, so as to form a physical isolation of external light, so as to prevent external light from entering the detection chamber from the air inlet chamber and the air outlet chamber and interfering with the detection results.

[0018] (2) The reflected light of the light-emitting element of this utility model is scattered onto the arc surface and will not be reflected back to the light-receiving element, thus eliminating stray light entering the light-receiving element; the arc surface can be made into a smooth flow without interfering with the airflow and can be used for stable detection.

[0019] (3) The heating element of this utility model provides power for the flow of mixed gas. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the high-precision dust sensor of this utility model in Embodiment 1;

[0021] Figure 2 This is a schematic diagram of the detection chamber of the high-precision dust sensor in Embodiment 2;

[0022] Figure 3 This is a front view of the high-precision dust sensor of this utility model in Embodiment 3;

[0023] Figure 4 yes Figure 3 AA section view;

[0024] Figure 5 yes Figure 4 BB section view;

[0025] Figure 6 yes Figure 5 CC section view;

[0026] Figure 7 yes Figure 5 DD sectional view;

[0027] In the diagram: 11. Light-emitting chamber, 111. Slit structure, 12. Light-emitting element, 13. Lens A, 21. Light-receiving chamber, 22. Light-receiving element, 23. Lens B, 31. Dust inlet chamber, 32. Transition chamber, 33. Detection chamber, 331. Shielding rod, 34. Dust outlet chamber, 41. Front shell, 411. Dust inlet, 412. Dust outlet, 413. Concave A, 4131. Guide slope A, 42. Rear shell, 421. Concave B, 5. Substrate, 51. Heating element. Detailed Implementation

[0028] Example 1: See Figure 1 A high-precision dust sensor includes a light-emitting component, a light-receiving component, and a dust channel. The dust channel includes a dust inlet chamber 31, a transition chamber 32, a detection chamber 33, and a dust outlet chamber 34 connected sequentially from bottom to top. Dust enters the high-precision dust sensor through the dust inlet chamber 31, then passes through the transition chamber 32 and the detection chamber 33 in sequence, and is discharged from the dust outlet chamber 34. Dust concentration is detected in the detection chamber 33. The light-emitting component and the light-receiving component are respectively disposed on both sides of the transition chamber 32, forming the basic components for dust concentration detection. The light-emitting component includes a light-emitting chamber 11 and a light-emitting element 12. The light-emitting element 12 is disposed in the light-emitting chamber. Inside 11, light is emitted to the right; the right side of the light-emitting chamber 11 is connected to the detection chamber 33; the light-receiving component includes a light-receiving chamber 21 and a light-receiving element 22; the light-receiving element 22 is located inside the light-receiving chamber 21 and receives the light emitted from the left; the detection chamber 33 is equipped with a shielding rod 331; the shielding rod 331 is located between the light-emitting element 12 and the light-receiving element 22 to block the light emitted from the light-emitting element 12, thereby preventing the direct light from the light-emitting element 12 from directly entering the light-receiving element 22, while allowing scattered light to reach the light-receiving element 22, ensuring the detection accuracy of the dust sensor, and saving the arrangement space of the light-emitting component and the light-receiving component.

[0029] Compared with the prior art, this utility model simplifies the optical path structure between the light-emitting component and the light-receiving component, so as to make the structure of the entire dust sensor more miniaturized, reduce the installation requirements of the dust sensor, and facilitate its widespread application.

[0030] The light-emitting component also includes lens A 13; lens A 13 is disposed between the light-emitting element 12 and the shielding rod 331; the light-receiving component also includes lens B 23; lens B 23 is disposed between the shielding rod 331 and the light-receiving element 22; the light-emitting element 12 is located at the focal point of lens A 13, which helps to convert the light emitted by the light-emitting element 12 into parallel light, making it easier to capture dust flowing through the detection chamber 33; the light-receiving element 22 is located at the focal point of lens B 23, which helps to gather the light entering the light-receiving chamber 21 to the light-receiving element 22, thereby improving the detection accuracy of the dust sensor.

[0031] Example 2: See Figure 2 Example 2 is basically the same as Example 1, and the similarities will not be repeated. The difference is that the shielding rod 331 has an arc surface on the side facing the light receiving element 22. The reflected light from the light emitting element 12 is scattered onto the arc surface and will not be reflected back to the light receiving element 22, thus eliminating stray light entering the light receiving element 22. The arc surface can make a smooth flow without interfering with the airflow and can be used for stable detection.

[0032] Example 3: See Figure 3-7 Example 3 is basically the same as Example 2, and the similarities will not be repeated. The difference is that the air inlet and air outlet are both arranged horizontally; the detection chamber 33 is arranged vertically; the air to be tested needs to turn once when it enters the transition chamber 32 from the air inlet and the air outlet from the detection chamber 33, so as to form a physical isolation of external light, so as to prevent external light from entering the detection chamber 33 from the air inlet and air outlet and interfering with the detection results.

[0033] The high-precision dust sensor also includes a housing and a substrate 5; the housing includes a front shell 41 and a rear shell 42; the front shell 41 and the rear shell 42 sandwich the substrate 5 in the middle; the dust inlet chamber 31 and the transition chamber 32 are disposed between the front shell 41 and the substrate 5; the light-emitting chamber 11, the light-receiving chamber 21, the detection chamber 33, and the dust outlet chamber 34 are disposed between the front shell 41 and the rear shell 42; the light-emitting element 12 and the light-receiving element 22 are mounted on the front side of the substrate 5; the high-precision dust sensor forms a structure that is easy to install.

[0034] A heating element 51 is provided on the substrate 5; the heating element 51 is located at the bottom of the transition chamber 32 and serves as the driving force for the flow of mixed gas.

[0035] The lower end of the front housing 41 is provided with a dust inlet 411 that communicates with the dust inlet chamber 31 to facilitate dust entering the dust sensor; the upper end of the front housing 41 is provided with a dust outlet 412 that communicates with the dust outlet chamber 34 to facilitate dust leaving the dust sensor.

[0036] The dust inlet chamber 31 is connected to the bottom left side of the transition chamber 32; the air to be tested flowing into the transition chamber 32 makes a turn; the dust outlet chamber 34 is connected to the top right side of the detection chamber 33; the air to be tested flowing into the dust outlet chamber 34 makes a turn; this provides better isolation from external light.

[0037] The front shell 41 has an indentation A 413 corresponding to the position of the detection chamber 33; the rear shell 42 has an indentation B 421 corresponding to the position of the detection chamber 33; the distance between the indentation A 413 and the indentation B 421 and the distance between the inner wall of the front shell 41 and the front wall of the substrate 5 are equal, so that the gas in the transition chamber 32 flows into the detection chamber 33 stably, ensuring the detection accuracy of the dust sensor.

[0038] The concave plate 413 has a guide slope plate 4131 on the side facing the transition chamber 32 to guide the gas smoothly into the detection chamber 33.

[0039] The detection chamber 33 is located at the top center of the transition chamber 32 to ensure that the transition chamber 32 fully absorbs external light and avoids interference from external light on dust detection.

[0040] The working principle of this embodiment is as follows: Dust enters the high-precision dust sensor through the dust inlet chamber 31, then passes through the transition chamber 32 and the detection chamber 33 in sequence, and is discharged from the dust outlet chamber 34. The dust concentration is detected in the detection chamber 33. The air to be tested needs to turn once when it enters the transition chamber 32 from the air inlet chamber and the outlet chamber from the detection chamber 33, forming a physical isolation of external light to prevent external light from entering the detection chamber 33 from the air inlet chamber and the outlet chamber and interfering with the detection results. The shielding rod 331 can prevent the direct light from the light-emitting element 12 from directly hitting the light-receiving element 22, while allowing the scattered light to hit the light-receiving element 22, ensuring the detection accuracy of the dust sensor and saving the arrangement space of the light-emitting and light-receiving components. This invention simplifies the optical path structure between the light-emitting component and the light-receiving component, making the entire dust sensor structure more miniaturized, reducing the installation requirements of the dust sensor, and facilitating its widespread application. The air to be measured needs to make a turn both when entering the transition chamber 32 from the inlet chamber and when entering the outlet chamber from the detection chamber 33, forming a physical barrier against external light to prevent external light from entering the detection chamber 33 from the inlet and outlet chambers and interfering with the detection results. The reflected light from the light-emitting element 12 is scattered onto the arc surface and will not be reflected back to the light-receiving element 22, eliminating stray light entering the light-receiving element 22. This arc surface can create a smooth flow without interfering with the airflow and allows for stable detection.

[0041] Example 4: Example 4 is basically the same as Example 3, and the similarities will not be repeated. The difference is that: the right end of the light-emitting chamber 11 is provided with a slit structure 111 corresponding to the light-emitting element 12; the stray light emitted by the light-emitting element 12 is diffusely reflected in the slit structure, which can reduce the stray light incident on the light-receiving element 22.

Claims

1. A high-precision dust sensor, comprising a light-emitting component, a light-receiving component, and a dust channel; characterized in that, The dust channel includes a dust inlet chamber, a transition chamber, a detection chamber, and a dust outlet chamber connected sequentially from bottom to top. Light-emitting components and light-receiving components are respectively located on both sides of the transition chamber. The light-emitting component includes a light-emitting chamber and a light-emitting element. The light-emitting element is located inside the light-emitting chamber and emits light to the right. The right side of the light-emitting chamber is connected to the detection chamber. The light-receiving component includes a light-receiving chamber and a light-receiving element. The light-receiving element is located inside the light-receiving chamber and receives light emitted from the left. A shielding rod is installed inside the detection chamber. This shielding rod is located between the light-emitting element and the light-receiving element to block the light emitted from the light-emitting element.

2. The high-precision dust sensor according to claim 1, characterized in that: It also includes an outer shell and a substrate; the outer shell includes a front shell and a rear shell; the front shell and the rear shell sandwich the substrate in the middle; the dust inlet chamber and the transition chamber are disposed between the front shell and the substrate; the light-emitting chamber, the light-receiving chamber, the detection chamber, and the dust outlet chamber are disposed between the front shell and the rear shell; the light-emitting element and the light-receiving element are mounted on the front side of the substrate.

3. The high-precision dust sensor according to claim 1, characterized in that: The light-emitting component also includes lens A; lens A is disposed between the light-emitting element and the shielding rod; the light-receiving component also includes lens B; lens B is disposed between the shielding rod and the light-receiving element; the light-emitting element is located at the focal point of lens A; the light-receiving element is located at the focal point of lens B.

4. The high-precision dust sensor according to claim 1, characterized in that: The shielding rod has an arc-shaped surface on the side facing the light-receiving element.

5. The high-precision dust sensor according to claim 1, characterized in that: A heating element is provided on the substrate; the heating element is located at the bottom of the transition chamber.

6. The high-precision dust sensor according to claim 2, characterized in that: The lower end of the front shell is provided with a dust inlet that communicates with the dust inlet chamber; the upper end of the front shell is provided with a dust outlet that communicates with the dust outlet chamber.

7. The high-precision dust sensor according to claim 6, characterized in that: The dust inlet chamber is connected to the bottom left side of the transition chamber; the dust outlet chamber is connected to the top right side of the detection chamber.

8. The high-precision dust sensor according to claim 2, characterized in that: The front shell has an inner recess A corresponding to the position of the detection chamber; the rear shell has an inner recess B corresponding to the position of the detection chamber; the distance between the inner recess A and the inner recess B, and the distance between the inner wall of the front shell and the front wall of the substrate are equivalent.

9. The high-precision dust sensor according to claim 1, characterized in that: The testing chamber is located at the top center of the transition chamber.

10. The high-precision dust sensor according to claim 1, characterized in that: The right end of the light-emitting chamber is equipped with a slit structure corresponding to the light-emitting element.

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