Washable particle counting sensor

Abstract

The utility model relates to the technical field of particle sensors, in particular to a washable particle counting sensor which comprises a lens, the lens is embedded in a photosensitive cavity, and the outer surface of the lens is sealed at the adjacent ends of a laser channel and an extinction channel; a through hole is formed in the lens in the circumferential direction of the air inlet channel in a penetrating mode, and the air inlet channel communicates with the exhaust channel through the through hole. According to the utility model, the lens is arranged in the photosensitive cavity, the outer surface of the lens is sealed at the adjacent ends of the laser channel and the extinction channel, the through hole is formed in the lens along the circumferential direction of the air inlet channel, and the air inlet channel is communicated with the exhaust channel through the through hole, so that water can be conveniently injected into the photosensitive cavity through the exhaust channel or the air inlet channel; in the cleaning process, water cannot enter the laser channel and the extinction channel, and compared with an existing cleaning mode, the sensor shell does not need to be disassembled, and the cleaning device is convenient and fast to use and small in maintenance difficulty.

Description

Technical Field

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

[0002] At present, the particle sensors on the market are mainly used to detect the concentration of particulate matter in the air. For example, a laser dust particle counting sensor disclosed in CN114279942A. These sensors are widely used in environmental monitoring, industrial safety, indoor air quality control and other fields. They can effectively measure particulate matters of different sizes, such as PM2.5, PM10, etc.

[0003] Due to their large inertia, large particulate matters in the sampling air flow are likely to accumulate and form blockages in the photosensitive cavity inside the sensor, affecting the normal operation of the sensor. Therefore, it is usually necessary to regularly disassemble the sensor housing for cleaning. This process not only takes a lot of time, but also requires professional operation, increasing the maintenance difficulty. Summary of the Utility Model

[0004] In view of this, the utility model provides a washable particle counting sensor, which is provided with a lens in the photosensitive cavity, and the outer surface of the lens is sealed at the adjacent ends of the laser channel and the extinction channel. At the same time, through holes are provided along the circumferential direction of the intake channel on the lens, and the intake channel is connected to the exhaust channel through the through holes, facilitating the injection of water into the photosensitive cavity through the exhaust channel or the intake channel to clean the photosensitive cavity. During the cleaning process, water will not enter the laser channel and the extinction channel. Compared with the existing cleaning method, it is not necessary to disassemble the sensor housing, which is more convenient and fast, and the maintenance difficulty is smaller.

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

[0006] The utility model provides a washable particle counting sensor, including a housing, wherein,

[0007] A photosensitive cavity is arranged inside the housing;

[0008] An intake channel is arranged on one side of the photosensitive cavity, and an exhaust channel is arranged on the other side. The intake channel and the exhaust channel are coaxial;

[0009] 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 coaxial, and the laser channel is perpendicular to the intake channel;

[0010] It also includes a lens, wherein,

[0011] The lens is embedded in the photosensitive cavity, and the outer surface of the lens is sealed at the adjacent ends of the laser channel and the extinction channel;

[0012] A through hole is provided on the lens and runs through the lens along the circumferential direction of the intake passage. The intake passage is communicated with the exhaust passage through the through hole.

[0013] Based on the above technical solutions, preferably, the photosensitive cavity, the lens, and the through hole are all square in shape.

[0014] Based on the above technical solutions, preferably, a laser emitter is further included, wherein,

[0015] One end of the laser emitter is screwed into one end of the laser passage far from the photosensitive cavity.

[0016] Based on the above technical solutions, preferably, the laser beam emitted by the laser emitter passes through the lens and then enters the extinction passage.

[0017] Based on the above technical solutions, preferably, the inner diameter of the extinction passage is larger than the inner diameter of the laser passage, and a black oxide coating is provided on the surface of the extinction passage.

[0018] Based on the above technical solutions, preferably, a photosensitive module is further included, wherein,

[0019] An installation passage is provided on one side of the photosensitive cavity. The installation passage is perpendicular to the intake passage and perpendicular to the laser passage. The outer surface of the lens is sealed on one end of the laser passage close to the photosensitive cavity;

[0020] The photosensitive module is fixed in the installation passage.

[0021] Based on the above technical solutions, preferably, the opposite ends of the intake passage and the exhaust passage extend out of the outer end of the housing, and a tubular structure is formed on the outer end of the housing.

[0022] Based on the above technical solutions, preferably, a sheath flow device is further included, wherein,

[0023] The sheath flow device is detachably provided on one end of the intake passage far from the photosensitive cavity.

[0024] Based on the above technical solutions, preferably, the sheath flow device includes a sheath flow tube and a jet tube, wherein,

[0025] One end of the sheath flow tube is screwed onto the intake passage and is communicated;

[0026] One end of the jet tube passes through the central hole of the sheath flow tube and extends into the through hole, and the other end is fixedly connected to the sheath flow tube.

[0027] Based on the above technical solutions, preferably, one end of the sheath flow tube is provided with an internal thread, and one end of the air inlet channel is provided with an external thread, wherein,

[0028] the internal thread meshes with the external thread.

[0029] The washable particle counting sensor of the present utility model has the following beneficial effects compared with the prior art:

[0030] (1) By arranging a lens in the photosensitive cavity, and the outer surface of the lens is sealed at the adjacent ends of the laser channel and the extinction channel. At the same time, through holes are arranged along the circumferential direction of the air inlet channel on the lens, and the air inlet channel is communicated with the exhaust channel through the through holes, which is convenient to inject water into the photosensitive cavity through the exhaust channel or the air inlet channel to clean the photosensitive cavity. During the cleaning process, water will not enter the laser channel and the extinction channel. Compared with the existing cleaning method, it is not necessary to disassemble the sensor housing, which is relatively convenient and fast, and the maintenance difficulty is small.

[0031] (2) By arranging a sheath flow device, it is convenient to increase a high-speed clean air flow through the cell sheath flow technology to comprehensively wrap the sampling air flow, so that the sampling air flow is not easy to break through the protection air flow and pollute the photosensitive cavity, and thus dust is not easy to adhere to the through holes of the lens, which is convenient for subsequent water washing. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model 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 utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is a perspective view of a washable particle counting sensor of the present utility model;

[0034] Figure 2 is a side view of a washable particle counting sensor of the present utility model;

[0035] Figure 3 is a sectional view taken along the line A-A of the present utility model;

[0036] Figure 4 is a sectional view taken along the line B-B of the present utility model;

[0037] In the figure: 1. Outer shell; 2. Lens; 3. Laser emitter; 4. Photosensitive module; 5. Sheath flow device; 51. Sheath flow tube; 52. Jet tube; 101. Photosensitive cavity; 102. Air intake channel; 103. Exhaust channel; 104. Laser channel; 105. Extinction channel; 106. Installation channel; 201. Through hole; 501. Internal thread; 1021. External thread. Detailed implementation mode

[0038] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the specific implementation modes of the present invention. Obviously, the described implementation modes are only a part of the implementation modes of the present invention, rather than all of the implementation modes. Based on the implementation modes in the present invention, all other implementation modes obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] As Figures 1-4 shown, a washable particle counting sensor of the present invention includes an outer shell 1, a lens 2, a laser emitter 3, and a photosensitive module 4.

[0040] Among them, the outer shell 1 is a rectangular structure, and a rectangular photosensitive cavity 101 is arranged inside it.

[0041] An air intake channel 102 is arranged on one side of the photosensitive cavity 101, and an exhaust channel 103 is arranged on the other side. The air intake channel 102 and the exhaust channel 103 are coaxial. As Figure 1 shown, the opposite ends of the air intake channel 102 and the exhaust channel 103 extend out of the outer end of the outer shell 1 and form a tubular structure on the outer end of the outer shell 1. The sampling air flow enters the photosensitive cavity 101 from the air intake channel 102 and then discharges from the exhaust channel 103.

[0042] The lens 2 is a square transparent optical lens, which is embedded in the photosensitive cavity 101. The outer surface of the lens 2 is sealed at the adjacent ends of the laser channel 104 and the extinction channel 105. Among them, a square through hole 201 is arranged through the lens 2 along the circumferential direction of the air intake channel 102. The air intake channel 102 and the exhaust channel 103 are connected through the through hole 201. After the sampling air flow enters the photosensitive cavity 101, it is in the through hole 201 and is protected by the lens 2, so that the photosensitive cavity 101 does not directly contact the sampling air flow.

[0043] As Figure 3As shown in the figure, a laser channel 104 is provided on one side of the photosensitive cavity 101, and an extinction channel 105 is provided on the other side. The laser channel 104 and the extinction channel 105 are coaxial, and the laser channel 104 is perpendicular to the intake channel 102. Among them, a laser emitter 3 is provided at one end of the laser channel 104 away from the photosensitive cavity 101. One end of the laser emitter 3 is screwed into the laser channel 104. The laser beam emitted by the laser emitter 3 passes through the lens 2 and then enters the extinction channel 105, and is subjected to extinction processing by the extinction channel 105.

[0044] To improve the extinction effect, the inner diameter of the extinction channel 105 is larger than that of the laser channel 104, and a black oxide coating is applied on the surface of the extinction channel 105.

[0045] As Figure 4 As shown in the figure, an installation channel 106 is provided on one side of the photosensitive cavity 101. The installation channel 106 is perpendicular to the intake channel 102 and perpendicular to the laser channel 104. The outer surface of the lens 2 is sealed at one end of the laser channel 104 close to the photosensitive cavity 101. The photosensitive module 4 is fixed in the installation channel 106. When the laser beam passes through the through hole 201, the sampled air flow is irradiated by the laser beam and emits a light scattering phenomenon. The photosensitive module 4 collects these scattered lights and converts them into electrical signals.

[0046] When it is necessary to clean the photosensitive cavity 101, water is injected into the photosensitive cavity 101 through the exhaust channel 103 or the intake channel 102. After the water enters the through hole 201, the lens 2 in the photosensitive cavity 101 is cleaned. During the cleaning process, due to the sealing effect of the lens 2, the water will not enter the laser channel 104 and the extinction channel 105. Compared with the existing cleaning method, it is not necessary to disassemble the housing 1 of the sensor, which is more convenient and fast, and the maintenance difficulty is smaller.

[0047] In order to reduce the dust attachment on the lens 2 and thus reduce the later maintenance difficulty, a sheath flow device 5 is detachably provided at one end of the intake channel 102 away from the photosensitive cavity 101, so as to increase a high-speed clean air flow through the cell sheath flow technology to comprehensively wrap the sampled air flow, making it difficult for the sampled air flow to break through the protective air flow and pollute the photosensitive cavity 101, and thus it is not easy for dust to attach to the through hole 201 of the lens 2, which is convenient for later water washing.

[0048] The sheath flow device 5 is any one of the existing technologies. For example, a sheath flow device disclosed in CN210142063U reveals the specific structure and principle of the sheath flow device. In the above-mentioned washable particle counting sensor, the sheath flow device 5 includes a sheath flow tube 51 and a jet tube 52. Among them, one end of the sheath flow tube 51 is screwed onto the intake channel 102 and communicated; one end of the jet tube 52 passes through the central hole of the sheath flow tube 51 and extends into the through hole 201, and the other end is fixedly connected to the sheath flow tube 51. A gap is reserved between the jet tube 52 and the intake channel 102 for the high-speed clean air flow to pass through.

[0049] When the sheath flow cell 5 is used, the sampling air flow is delivered from the jet tube 52 to the through hole 201, and the high-speed clean air flow is input from the sheath flow tube 51 into the gap between the jet tube 52 and the air inlet channel 102, and wraps the sampling air flow at the outlet of the jet tube 52. Among them, the high-speed clean air flow can be supplied by an air source, and the air source is used to generate compressed air, and the compressed air is input into the sheath flow tube 51 after purification treatment to form a high-speed clean air flow.

[0050] As Figures 2-3 shown, in order to realize the screw connection between the sheath flow tube 51 and the air inlet channel 102, an internal thread 501 is provided at one end of the sheath flow tube 51, and an external thread 1021 is provided at one end of the air inlet channel 102. Among them, the internal thread 501 meshes with the external thread 1021.

[0051] The usage method of a washable particle counting sensor of the present utility model is as follows:

[0052] When it is necessary to clean the photosensitive cavity 101, water or cleaning liquid is injected into the photosensitive cavity 101 through the pipeline to the exhaust channel 103, and the lens 2 and its through hole 201 are cleaned with the cleaning liquid to remove dust. The outer diameter of the water injection pipeline is smaller than the inner diameter of the exhaust channel 103. Therefore, during the water injection process, the waste water can be discharged from the exhaust channel 103.

[0053] 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 washable particle counting sensor, comprising a housing (1), wherein, a photosensitive cavity (101) is arranged inside the housing (1); an air inlet channel (102) is arranged on one side of the photosensitive cavity (101), and an air outlet channel (103) is arranged on the other side. The air inlet channel (102) and the air outlet channel (103) are coaxial; a laser channel (104) is arranged on one side of the photosensitive cavity (101), and an extinction channel (105) is arranged on the other side. The laser channel (104) and the extinction channel (105) are coaxial, and the laser channel (104) is perpendicular to the air inlet channel (102); characterized in that: it further comprises a lens (2), wherein, the lens (2) is embedded in the photosensitive cavity (101), and the outer surface of the lens (2) is sealed on the adjacent ends of the laser channel (104) and the extinction channel (105); a through hole (201) is arranged on the lens (2) along the circumferential direction of the air inlet channel (102), and the air inlet channel (102) is communicated with the air outlet channel (103) through the through hole (201).

2. The washable particle counting sensor according to claim 1, wherein: The photosensitive cavity (101), the lens (2) and the through hole (201) are all square-shaped.

3. The washable particle counting sensor according to claim 1, wherein: It further comprises a laser emitter (3), wherein, one end of the laser emitter (3) is screwed into one end of the laser channel (104) far from the photosensitive cavity (101).

4. The washable particle counting sensor according to claim 3, characterized in that: The laser beam emitted by the laser emitter (3) passes through the lens (2) and then enters the extinction channel (105).

5. The washable particle counting sensor according to claim 1, wherein: The inner diameter of the extinction channel (105) is larger than the inner diameter of the laser channel (104), and a black oxide coating is provided on the surface of the extinction channel (105).

6. The washable particle counting sensor according to claim 1, wherein: It further comprises a photosensitive module (4), wherein, an installation channel (106) is arranged on one side of the photosensitive cavity (101). The installation channel (106) is perpendicular to the air inlet channel (102) and perpendicular to the laser channel (104), and the outer surface of the lens (2) is sealed on one end of the laser channel (104) close to the photosensitive cavity (101); the photosensitive module (4) is fixed in the installation channel (106).

7. The washable particle counting sensor according to claim 1, wherein: The opposite ends of the air inlet channel (102) and the air outlet channel (103) extend out of the outer end of the housing (1) and form a tubular structure on the outer end of the housing (1).

8. The washable particle counting sensor according to claim 7, wherein: It further comprises a sheath flow device (5), wherein, the sheath flow device (5) is detachably arranged on one end of the air inlet channel (102) far from the photosensitive cavity (101).

9. The washable particle counting sensor according to claim 8, characterized in that: The sheath flow device (5) comprises a sheath flow tube (51) and a jet tube (52), wherein, one end of the sheath flow tube (51) is screwed onto the air inlet channel (102) and communicated; one end of the jet tube (52) passes through the central hole of the sheath flow tube (51) and extends into the through hole (201), and the other end is fixedly connected to the sheath flow tube (51).

10. The washable particle counting sensor according to claim 9, characterized in that: One end of the sheath flow tube (51) is provided with an internal thread (501), and one end of the intake passage (102) is provided with an external thread (1021), wherein, The internal thread (501) meshes with the external thread (1021).

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