Light supplementing structure of particle counting sensor

Abstract

The utility model relates to the technical field of particle counting sensors, in particular to a light supplementing structure of a particle counting sensor, which comprises a sensor body and a laser transmitter, a photosensitive cavity is arranged in the sensor body, a laser channel is arranged on one side of the photosensitive cavity, and an extinction channel is arranged on the other side of the photosensitive cavity. The laser channel and the extinction channel are coaxially arranged; the delustring device further comprises a plug, and one end of the plug is detachably arranged in the delustring channel. A counter bore is formed in one end, facing the laser channel, of the plug, and the bottom of the counter bore is used for reflecting a laser beam emitted by the laser emitter back to the photosensitive cavity; according to the utility model, the hole bottom of the counter bore is used for reflecting the laser beam emitted by the laser emitter back to the photosensitive cavity, so that the sampling air flow can be subjected to bidirectional irradiation, light supplement is realized, and when the number of particles in the sampling air flow is large, the light scattering effect can be enhanced in a bidirectional irradiation manner, and the measurement precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of particle counting sensors, in particular to a supplementary light structure for a particle counting sensor. Background Art

[0002] A particle counting sensor is a device used to detect and measure the number of suspended particulate matters in the air. Its working principle is usually based on the optical scattering method or the laser scattering method. When air passes through the photosensitive area inside the sensor, the particles therein will scatter the light emitted by the light source. The photodiodes or other photosensitive elements in the sensor will detect these scattered lights and convert them into electrical signals. By analyzing these signals, the sensor can calculate the number and size distribution of the particles, such as a laser dust particle counting sensor disclosed in CN114279942A.

[0003] In traditional particle counting sensors, the light emitted by the light source irradiates the sampling air flow unidirectionally. When the number of particles in the sampling air flow is large, the effect of light scattering will become poor and the measurement accuracy will decrease. To solve the above technical problems, it is necessary to provide a supplementary light structure for a particle counting sensor. Summary of the Utility Model

[0004] In view of this, the utility model provides a supplementary light structure for a particle counting sensor, which reflects the laser beam emitted by the laser emitter back into the photosensitive cavity by setting the bottom of the counterbore, so as to irradiate the sampling air flow bidirectionally for supplementary light, and further, when the number of particles in the sampling air flow is large, the effect of light scattering can be enhanced by the bidirectional irradiation method to improve the measurement accuracy.

[0005] The technical solution of the utility model is realized as follows:

[0006] The utility model provides a supplementary light structure for a particle counting sensor, including a sensor body and a laser emitter, wherein,

[0007] A photosensitive cavity is arranged inside the sensor body, a laser channel is arranged on one side of the photosensitive cavity, and an extinction channel is arranged on the other side. The laser channel and the extinction channel are coaxially arranged;

[0008] The laser emitter is arranged in the extinction channel and used to emit a laser beam towards the extinction channel;

[0009] It further includes a plug, wherein,

[0010] One end of the plug is detachably arranged in the extinction channel;

[0011] A counterbore is arranged at one end of the plug facing the laser channel, and the bottom of the counterbore is used to reflect the laser beam emitted by the laser emitter back into the photosensitive cavity.

[0012] Based on the above technical solutions, preferably, the counterbore includes a first round hole portion, a tapered hole portion, and a second round hole portion, wherein,

[0013] The tapered hole portion is disposed between the first round hole portion and the second round hole portion;

[0014] The inner diameter of the adjacent end of the tapered hole portion and the first round hole portion is equal, and the inner diameter of the adjacent end of the tapered hole portion and the second round hole portion is equal;

[0015] The inner diameter of the first round hole portion is greater than the inner diameter of the second round hole portion;

[0016] The inner diameter of the end of the laser channel close to the photosensitive cavity is equal to the inner diameter of the second round hole portion.

[0017] Based on the above technical solutions, preferably, the end of the first round hole portion away from the tapered hole portion is in the shape of a flared opening.

[0018] Based on the above technical solutions, preferably, the bottom of the counterbore is mirror-like.

[0019] Based on the above technical solutions, preferably, a black oxide coating is provided on the hole wall of the counterbore.

[0020] Based on the above technical solutions, preferably, internal threads are provided on the inner wall of the light extinction channel, and external threads are provided on one end of the plug, wherein,

[0021] The internal threads and the external threads are engaged with each other.

[0022] Based on the above technical solutions, preferably, the end of the plug away from the light extinction channel has a prismatic structure.

[0023] Based on the above technical solutions, preferably, anti-slip patterns are provided on the side of the end of the plug away from the light extinction channel.

[0024] Based on the above technical solutions, preferably, the photosensitive cavity is in the shape of a round hole, and the central axis of the laser channel passes through the center of the photosensitive cavity.

[0025] Based on the above technical solutions, preferably, a counterbore is provided at the end of the laser channel away from the photosensitive cavity, and one end of the laser emitter is screwed into the counterbore.

[0026] The supplementary light structure of a particle counting sensor of the present utility model has the following beneficial effects compared with the prior art:

[0027] (1) By setting the bottom of the counterbore to reflect the laser beam emitted by the laser emitter back into the photosensitive cavity, it is convenient to perform bidirectional irradiation on the sampling air flow to achieve supplementary lighting. Furthermore, when the number of particles in the sampling air flow is large, the effect of light scattering can be enhanced through bidirectional irradiation, thereby improving the measurement accuracy.

[0028] (2) By setting the counterbore to include a first round hole portion, a tapered hole portion, and a second round hole portion, it is convenient to correct the laser beam entering the counterbore through this structure, so that the path of the reflected laser beam is the same as that of the original laser beam.

[0029] (3) By setting the bottom of the counterbore to be mirror-like, it is convenient to improve the reflection effect of the laser beam. At the same time, by setting a black oxide coating on the hole wall of the counterbore, it is convenient to absorb the stray light generated after the laser beam is reflected, so as to eliminate the stray light and improve the measurement accuracy. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 Is a perspective view of the supplementary lighting structure of a particle counting sensor of the present invention;

[0032] Figure 2 Is a side view of the supplementary lighting structure of a particle counting sensor of the present invention;

[0033] Figure 3 Is a cross-sectional view taken along the A-A direction of the present invention;

[0034] Figure 4 Is a schematic structural diagram of the plug portion of the present invention;

[0035] In the figure: 1, sensor body; 2, laser emitter; 3, plug; 101, photosensitive cavity; 102, laser channel; 103, extinction channel; 301, counterbore; 302, external thread; 1011, sinking groove; 1031, internal thread; 3011, first round hole portion; 3012, tapered hole portion; 3013, second round hole portion. Detailed Embodiment

[0036] Next, in combination with the specific embodiments of the present utility model, the technical solutions in the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0037] As Figures 1-4 shown, a supplementary light structure of a particle counting sensor of the present utility model includes a sensor body 1, a laser emitter 2, and a plug 3.

[0038] Among them, a photosensitive cavity 101 in the shape of a circular hole is provided inside the sensor body 1. A laser channel 102 is provided on one side of the photosensitive cavity 101, and an extinction channel 103 is provided on the other side. The laser channel 102 and the extinction channel 103 are coaxially arranged, and the central axis of the laser channel 102 passes through the center of the photosensitive cavity 101. In addition, a reflecting mirror and a photodiode are also provided in the photosensitive cavity 101. An air inlet channel is provided on one side of the photosensitive cavity 101, and an air outlet channel is provided on the other side. The sampling air flow enters the photosensitive cavity 101 from the air inlet channel and then exits from the air outlet channel. During this process, the sampling air flow is irradiated by the laser in the photosensitive cavity 101 and undergoes a light scattering phenomenon. The specific counting principle can be known in the prior art. For example, the counting principle is disclosed in the optical path system of a particle counting sensor disclosed in CN218445045U.

[0039] One end of the plug 3 is detachably arranged in the extinction channel 103. Among them, a counterbore 301 is provided at one end of the plug 3 facing the laser channel 102 for receiving the laser. At the same time, a black oxide coating is applied on the inner wall of the counterbore 301 for absorbing stray light on the laser beam.

[0040] The laser emitter 2 is arranged in the extinction channel 103 for emitting a laser beam in the direction of the extinction channel 103. Specifically, a sink 1011 is provided at one end of the laser channel 102 away from the photosensitive cavity 101, and a threaded structure is provided in the sink 1011. One end of the laser emitter 2 is screwed into the sink 1011, which is convenient for disassembly and maintenance.

[0041] When the laser emitter 2 is emitting, the laser beam sequentially passes through the laser channel 102, the photosensitive cavity 101, and the extinction channel 103, and then hits the bottom of the counterbore 301. After that, the bottom of the counterbore 301 reflects the laser beam back into the photosensitive cavity 101 to achieve supplementary light. When the number of particles in the sampling air flow is large, the light scattering effect can be enhanced by the way of bidirectional irradiation to improve the measurement accuracy.

[0042] To improve the reflection effect, the bottom of the counterbore 301 is mirror-shaped. Specifically, this mirror-shaped structure is a plane mirror, and the mirror surface faces the laser channel 102.

[0043] After the laser beam irradiates the sampling air flow, it is affected by particles in the air, and its path may deviate during the process of passing through the extinction channel 103. Therefore, it is necessary to correct the path of the laser beam so that the emitted laser beam is coaxial with the original laser beam. For this purpose, a deviation correction structure is provided in the counterbore 301. Specifically, as Figure 4 shown, the counterbore 301 includes a first round hole part 3011, a tapered hole part 3012, and a second round hole part 3013.

[0044] Among them, the tapered hole part 3012 is arranged between the first round hole part 3011 and the second round hole part 3013. The inner diameter of the adjacent end of the tapered hole part 3012 and the first round hole part 3011 is equal, and the inner diameter of the adjacent end of the tapered hole part 3012 and the second round hole part 3013 is equal. The inner diameter of the first round hole part 3011 is larger than the inner diameter of the second round hole part 3013. The inner diameter of the end of the laser channel 102 close to the photosensitive cavity 101 is equal to the inner diameter of the second round hole part 3013.

[0045] When the laser beam passes through the first round hole part 3011 and reaches the tapered hole part 3012, the tapered hole part 3012 corrects the laser beam. After the corrected laser beam passes through the second round hole part 3013, it irradiates on the bottom of the hole and then is emitted. In this way, the reflected laser beam is coaxial with the original laser beam and will not interfere with the measurement.

[0046] As Figure 4 shown, in order to concentrate the laser beam into the first round hole part 3011, the end of the first round hole part 3011 away from the tapered hole part 3012 is in the shape of a flared opening to concentrate the laser beam.

[0047] In the above structure, the plug 3 is installed in the extinction channel 103 by means of screw engagement. Specifically, as Figures 3-4 shown, internal threads 1031 are provided on the inner wall of the extinction channel 103, and external threads 302 are provided on one end of the plug 3. Among them, the internal threads 1031 and the external threads 302 are engaged. During installation, after the internal threads 1031 and the external threads 302 are engaged and tightened, the installation of the plug 3 can be achieved. This structure facilitates the later replacement and maintenance of the plug 3.

[0048] To facilitate the screwing of the plug 3, the end of the plug 3 away from the extinction channel 103 is set to a prismatic structure, or anti-slip patterns are provided on the side of the end of the plug 3 away from the extinction channel 103 to achieve anti-slip and facilitate screwing.

[0049] In addition, internal threads 1031 are provided on the inner wall of the extinction channel 103, and the surface of the internal threads 1031 is subjected to black oxidation treatment. When the emitted laser beam passes through the extinction channel 103, the internal threads 1031 can absorb the stray light on the laser beam.

[0050] The usage method of the supplementary light structure of a particle counting sensor of the present utility model is as follows:

[0051] First, screw the end of the plug 3 with the external threads 302 into the extinction channel 103, and emit a laser beam from the laser emitter 2 in the direction of the plug 3. When the laser beam is reflected after hitting the counterbore 301 and re-enters the photosensitive cavity 101 along the original path, bidirectional illumination is achieved. When the number of particles in the sampling air flow is large, the effect of light scattering can be enhanced by the way of bidirectional illumination to improve the measurement accuracy.

[0052] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A supplementary light structure for a particle counting sensor, comprising a sensor body (1) and a laser emitter (2), wherein, a photosensitive cavity (101) is arranged inside the sensor body (1), a laser channel (102) is arranged on one side of the photosensitive cavity (101), and an extinction channel (103) is arranged on the other side. The laser channel (102) and the extinction channel (103) are coaxially arranged; the laser emitter (2) is arranged in the extinction channel (103) and is used for emitting a laser beam in the direction of the extinction channel (103); it is characterized in that: it further comprises a plug (3), wherein, one end of the plug (3) is detachably arranged in the extinction channel (103); a counterbore (301) is arranged on one end of the plug (3) facing the laser channel (102), and the bottom of the counterbore (301) is used for reflecting the laser beam emitted by the laser emitter (2) back into the photosensitive cavity (101).

2. The supplementary lighting structure of a particle counting sensor according to claim 1, characterized in that: The counterbore (301) comprises a first round hole part (3011), a tapered hole part (3012) and a second round hole part (3013), wherein, the tapered hole part (3012) is arranged between the first round hole part (3011) and the second round hole part (3013); the inner diameter of the adjacent end of the tapered hole part (3012) and the first round hole part (3011) is equal, and the inner diameter of the adjacent end of the tapered hole part (3012) and the second round hole part (3013) is equal; the inner diameter of the first round hole part (3011) is larger than the inner diameter of the second round hole part (3013); the inner diameter of the end of the laser channel (102) close to the photosensitive cavity (101) is equal to the inner diameter of the second round hole part (3013).

3. The supplementary light structure of a particle counting sensor according to claim 2, characterized in that: One end of the first round hole part (3011) far from the tapered hole part (3012) is in the shape of a flared opening.

4. The supplementary light structure of a particle counting sensor according to claim 1, characterized in that: The bottom of the counterbore (301) is mirror-like.

5. The supplementary lighting structure of a particle counting sensor according to claim 4, characterized in that: A black oxide coating is applied on the inner wall of the counterbore (301).

6. The supplementary light structure of a particle counting sensor according to claim 1, characterized in that: Internal threads (1031) are arranged on the inner wall of the extinction channel (103), and external threads (302) are arranged on one end of the plug (3), wherein, the internal threads (1031) and the external threads (302) are meshed with each other.

7. The supplementary light structure of a particle counting sensor according to claim 6, characterized in that: One end of the plug (3) far from the extinction channel (103) is in a prismatic structure.

8. The supplementary light structure of a particle counting sensor according to claim 6, characterized in that: Anti-slip patterns are arranged on the side part of one end of the plug (3) far from the extinction channel (103).

9. The supplementary light structure of a particle counting sensor according to claim 1, characterized in that: The photosensitive cavity (101) is in a round hole shape, and the central axis of the laser channel (102) passes through the center of the photosensitive cavity (101).

10. The supplementary light structure of a particle counting sensor according to claim 7, characterized in that: A counterbore (1011) is arranged on one end of the laser channel (102) far from the photosensitive cavity (101), and one end of the laser emitter (2) is screwed into the counterbore (1011).

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