Industrial dust sensor

Abstract

The utility model discloses an industrial dust sensor which comprises an outer shell, an optical structure used for testing dust concentration is installed in the outer shell, a top cover is arranged at the upper end of the outer shell, a circuit module is installed on the bottom face of the top cover, and a gas circuit structure is arranged in the lower end of the outer shell and comprises an inner shell. A detection through hole and a flow guide grid arranged around the detection through hole are arranged in the middle of the top surface of the inner shell, an exhaust assembly is arranged on the inner shell, a plurality of sampling through holes are formed in the side wall of the outer shell, and airflow enters the flow guide grid through the sampling through holes and converges at the detection through hole; according to the utility model, airflow can be homogenized through the flow guide grating, so that gas sampling is more uniform, external light is prevented from entering the detection through holes and interfering a test result, the exhaust assembly can directly discharge tested particles, a self-cleaning pollution discharge effect is achieved, the sampling area is increased through the plurality of sampling through holes, and the sampling efficiency is improved. And the test is more representative and is not easy to block, so that the high-concentration dust test is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of dust sensor technology, and in particular to an industrial dust sensor. Background Technology

[0002] Dust sensors are widely used in various industrial environments, such as steel, power generation, chemical, and cement industries. They monitor dust concentration in the industrial environment in real time and trigger an alarm when the concentration exceeds a preset value. The use of dust sensors effectively protects worker health and safety. The principle of light scattering in dust sensors is that dust-laden airflow enters the detection chamber through the inlet, and under laser irradiation, it generates scattered light. This scattered light is received by a photodetector, converted into an electrical signal, and then converted from digital to analog to obtain dust concentration data.

[0003] Dust sensors operate in harsh environments with high dust concentrations, which can easily lead to problems such as inlet blockage, dust accumulation inside the sensor, and uneven sampling airflow, severely affecting the test results. Therefore, this application proposes an industrial dust sensor to address these issues. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an industrial dust sensor that features uniform sampling airflow, self-cleaning and dust removal, and anti-clogging properties.

[0005] To solve the above-mentioned technical problems, this utility model includes a shell, an optical structure for testing dust concentration is installed inside the shell, a top cover is provided at the upper end of the shell, a circuit module for power supply is installed on the bottom surface of the top cover, an air passage structure is provided inside the lower end of the shell, the air passage structure includes an inner shell, a detection through hole is provided in the middle of the top surface of the inner shell and a flow guide grid arranged around the detection through hole, an exhaust assembly is provided on the inner shell, and a plurality of sampling through holes are provided on the side wall of the shell. The airflow enters the flow guide grid through the sampling through holes and converges at the detection through hole.

[0006] Preferably, the optical structure includes a laser, a detector, and a light trap. The laser and the detector are respectively mounted obliquely on the inner wall of the outer shell above the inner shell. The light trap is mounted on the inner wall of the inner shell. The laser beam of the laser passes through the detection through-hole and the light trap is in the laser beam path of the laser. The laser beam emitted by the laser is scattered by particles and received by the detector. Other stray laser beams enter the light trap.

[0007] Preferably, the sampling through holes are circumferentially distributed, and the sampling through holes are at the same height and position as the outer edge of the flow guide grille.

[0008] Preferably, the flow guide grid includes a plurality of grid plates, which are circumferentially distributed. The inner edge of the grid plate is flush with the inner wall of the detection through hole, and the outer edge of the grid plate is attached to the inner wall of the outer shell. The sampling through hole is located between two adjacent grid plates.

[0009] Preferably, the grating plate is a corrugated plate, and all the grating plates form an inner spiral-shaped flow guide grating.

[0010] Preferably, the grid plate is a multi-folded plate.

[0011] Preferably, the height of the grating plate gradually decreases from the outer edge to the inner edge.

[0012] Preferably, the exhaust assembly includes a bottom cover fixed to the bottom of the inner shell and a fan. The fan is located inside the inner shell and on the side away from the light trap. The bottom cover is provided with a plurality of exhaust holes and maintenance holes.

[0013] Preferably, the fan is mounted on the bottom cover and positioned away from the light trap.

[0014] Preferably, the top cover is provided with a flange joint.

[0015] The beneficial effects of this utility model are as follows: By setting a flow guide grille around the detection through hole on the top surface of the inner shell, this utility model can uniformly distribute airflow, making gas sampling more uniform. At the same time, it can block external light from entering the detection through hole and interfering with the test results. Meanwhile, the exhaust component can directly discharge the particulate matter after the test, which has a self-cleaning and sewage discharge effect. Multiple sampling through holes increase the sampling area, making the test more representative and less prone to clogging, which is beneficial for high-concentration dust testing. Attached Figure Description

[0016] Figure 1 This is a front view of the overall structure of this utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0018] Figure 3 This is a three-dimensional schematic diagram of the gas path structure of this utility model;

[0019] Figure 4 In this utility model Figure 3 A plan view;

[0020] Figure 5 This is a schematic diagram of a grid plate structure in the air passage structure of this utility model;

[0021] Figure 6 This is a schematic diagram of another type of grille structure in the air passage structure of this utility model;

[0022] Figure 7 This is a schematic diagram of the fan in the middle of the overall structure of this utility model.

[0023] In the diagram: 1. Outer shell; 2. Top cover; 3. Circuit module; 4. Inner shell; 5. Detection through hole; 6. Flow guide grille; 61. Grille plate; 62. Inner edge; 63. Outer edge; 7. Sampling through hole; 8. Laser; 9. Detector; 10. Light trap; 11. Bottom cover; 12. Fan; 13. Exhaust port; 14. Maintenance port; 15. Flange joint. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All directional indicators (such as up, down, left, right, front, back, etc.) in the present utility model are only used to explain the relative positional relationship and movement of each component in a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indicator will also change accordingly.

[0025] like Figure 1-4 As shown, this embodiment provides an industrial dust sensor, including a housing 1. An optical structure for testing dust concentration is installed inside the housing 1. A top cover 2 is provided at the upper end of the housing 1. A circuit module 3 is installed on the bottom surface of the top cover 2. The circuit module 3 is connected to a laser 8, a detector 9, and a fan 12 via board connections or wires for power supply. An air passage structure is provided inside the lower end of the housing 1. The air passage structure includes an inner shell 4. A detection through hole 5 and a flow guide grille 6 arranged around the detection through hole 5 are provided in the middle of the top surface of the inner shell 4. An exhaust assembly is provided on the inner shell 4. Several sampling through holes 7 are provided on the side wall of the housing 1. The airflow enters the flow guide grille 6 through the sampling through holes 7 and converges at the detection through hole 5.

[0026] The optical structure includes a laser 8, a detector 9, and a light trap 10. The laser 8 and the detector 9 are respectively tilted and installed on the inner wall of the outer shell 1 above the inner shell 4. The tilt angle of the laser 8 and the detector 9 forms a 90° angle. The light trap 10 is installed on the inner wall of the inner shell 4. The laser light emitted by the laser 8 passes through the detection through-hole 5 and the light trap 10 is in the laser light path of the laser 8. The laser light emitted by the laser 8 is scattered by particles and received by the detector 9. Other stray laser light enters the light trap 10.

[0027] The sampling through holes 7 are distributed in a circle, and the sampling through holes 7 are at the same height and position as the outer edge 63 of the guide grille 6. The annular distribution of the sampling through holes 7 can collect the airflow around 360°, increasing the sampling area and making it less prone to clogging.

[0028] The sampling through-hole 7 can be a regular or irregular shape such as a circle, semi-circle, ellipse, star, heart, or polygon. In this example, the sampling through-hole 7 is rectangular. The sampling through-hole 7 can be presented in multiple rows, and the height of the multiple rows of sampling through-hole 7 needs to be consistent with the height of the outer edge 63 of the flow guide grille 6.

[0029] The flow guide grid 6 includes several grid plates 61, which are distributed circumferentially. The inner edge 62 of the grid plate 61 is flush with the inner wall of the detection through hole 5, and the outer edge 63 of the grid plate 61 is attached to the inner wall of the outer shell 1. The sampling through hole 7 is located between two adjacent grid plates 61. The adjacent grid plates 61 form an airflow channel. The sampling gas enters the airflow channel through the sampling through hole 7 and is collected at the sampling through hole 7. The height of the grid plate 61 gradually decreases from the outer edge 63 to the inner edge 62. The height of the inner edge 62 is shorter than that of the outer edge 63, which is more conducive to the collection and convergence of airflow.

[0030] The grid plate 61 is a corrugated plate, and all the grid plates 61 form an inner spiral guide grid 6, which can uniformly distribute the airflow, increase the airflow intake, improve the sampling volume, and at the same time delay the airflow stagnation time, thereby improving the detection accuracy.

[0031] like Figures 5-6 As shown, the grid plate 61 can also be other shapes, such as a multi-fold plate. The multi-fold plate can be a single fold plate or a multi-fold plate forming a raised structure.

[0032] like Figure 1 , 7 As shown, the exhaust assembly includes a bottom cover 11 fixed to the bottom of the inner shell 4 and a fan 12. The fan 12 is located inside the inner shell 4. The bottom cover 11 is provided with several exhaust holes 13 and a maintenance hole 14. Specifically, the maintenance hole 14 is located on one side of the exhaust hole 13. The fan 12 is fixed to the bottom cover 11 and is far away from the light trap 10. This avoids damage to the fan 12 caused by the laser and reduces the influence of some stray light. Of course, the fan 12 can also be located in the middle of the bottom cover 11. The exhaust holes 13 are located directly below the fan 12, which can play the role of allowing negative pressure to enter the sampling airflow and allowing the airflow to be discharged. The maintenance hole 14 facilitates the cleaning of the equipment.

[0033] A flange joint 15 is provided on the top cover 2. The flange joint 15 is located in the middle, edge or other position of the top cover 2. In this example, the flange joint 15 is located on the side of the top cover 2, away from the center, so that the sensor can be easily installed against the wall.

[0034] Its working principle is as follows: After the fan 12 is started, a negative pressure is formed inside the industrial dust sensor. Under the action of negative pressure, the sampling airflow enters the guide grid 6 through the sampling through hole 7. The particles converge at the detection through hole 5 in the middle of the sensor with the airflow in all directions. The laser emitted by the laser 8 is scattered by the particles and received by the detector 9. Other stray lasers enter the light trap 10. With the continued action of the fan 12, the particles that have been tested are discharged through the exhaust hole 13, giving the industrial dust sensor a self-cleaning and decontamination function. By setting the guide grid 6 around the detection through hole 5 on the top surface of the inner shell 4, the airflow can be uniform, making the gas sampling more uniform. At the same time, it can block external light from entering the detection through hole 5 and interfering with the test results. Meanwhile, the exhaust component can directly discharge the particles that have been tested, which has a self-cleaning and decontamination effect. Multiple sampling through holes 7 increase the sampling area, making the test more representative and less prone to clogging, which is beneficial for high-concentration dust testing.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An industrial dust sensor, comprising a housing, characterized in that, The housing contains an optical structure for testing dust concentration. The upper end of the housing has a top cover, and the bottom surface of the top cover has a circuit module for power supply. The lower end of the housing has an air passage structure, which includes an inner shell. The top surface of the inner shell has a detection through hole and a flow guide grid around the detection through hole. The inner shell has an exhaust assembly. The side wall of the housing has several sampling through holes. The airflow enters the flow guide grid through the sampling through holes and converges at the detection through hole.

2. An industrial dust sensor according to claim 1, characterized in that, The optical structure includes a laser, a detector, and a light trap. The laser and the detector are respectively tilted and mounted on the inner wall of the outer shell above the inner shell. The light trap is mounted on the inner wall of the inner shell. The laser beam of the laser passes through the detection through-hole and the light trap is in the laser beam path of the laser. The laser beam emitted by the laser is scattered by particles and received by the detector. Other stray laser beams enter the light trap.

3. An industrial dust sensor according to claim 1, characterized in that, The sampling through holes are distributed in a circle, and the sampling through holes are at the same height and position as the outer edge of the flow guide grille.

4. An industrial dust sensor according to claim 1, characterized in that, The flow guide grid includes several grid plates, which are circumferentially distributed. The inner edge of the grid plate is flush with the inner wall of the detection through hole, and the outer edge of the grid plate is attached to the inner wall of the outer shell. The sampling through hole is located between two adjacent grid plates.

5. An industrial dust sensor according to claim 4, characterized in that, The grating is a corrugated plate, and all the gratings form an inner spiral-shaped flow guide grating.

6. An industrial dust sensor according to claim 4, characterized in that, The grating plate is a multi-folded plate.

7. An industrial dust sensor according to claim 4, characterized in that, The height of the grating plate gradually decreases from the outer edge to the inner edge.

8. An industrial dust sensor according to claim 2, characterized in that, The exhaust assembly includes a bottom cover fixed to the bottom of the inner shell and a fan. The fan is located inside the inner shell. The bottom cover has several exhaust holes and maintenance holes.

9. An industrial dust sensor according to claim 8, characterized in that, The fan is mounted on the bottom cover and is positioned away from the light trap.

10. An industrial dust sensor according to claim 1, characterized in that, The top cover is equipped with a flange joint.

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