Dust concentration detection and early warning device

Abstract

The utility model relates to the technical field of dust detection, in particular to a dust concentration detection early warning device which comprises a laser dust instrument, an audible and visual alarm is arranged on the laser dust instrument, an air inlet of the laser dust instrument is communicated with an air inlet pipe, a plurality of through holes are formed in the outer wall of the air inlet pipe in the circumferential direction and the length direction respectively, and the through holes are communicated with the audible and visual alarm. A plurality of through holes are formed in the air inlet pipe, a mesh basket is arranged at each through hole, the bottom wall of each mesh basket is located in the air inlet pipe, a gap for air to pass through is reserved in the middle of each mesh basket, a drying bag is arranged in each mesh basket, and a cover plate is arranged at each through hole of the air inlet pipe. According to the utility model, the laser dust meter can more conveniently detect the dust content in the air with higher humidity.

Description

Technical Field

[0001] The utility model relates to the technical field of dust detection, in particular to a dust concentration detection and early warning device. Background Art

[0002] A dust detector is a device used to detect the dust concentration in the ambient air. Dust detectors are referred to as dust meters, also called dust measuring instruments or dust testers. They are mainly used to detect the dust concentration in the ambient air. Dust meters are divided into: laser dust meters, online continuous monitoring dust meters, portable dust meters, etc. Dust meters are widely used in disease prevention and control centers, mines, metallurgy, power plants, chemical manufacturing, health supervision, environmental protection, online environmental monitoring, etc.

[0003] Among them, the laser dust monitor includes a shell, a sensor darkroom is arranged inside the shell, an air inlet and an air outlet are arranged on the shell, and the air inlet and the air outlet are connected to the sensor darkroom. The sensor darkroom is provided with a laser generator and a photoelectric detection circuit, and an exhaust system is also arranged in the shell. When the laser dust monitor is working, the exhaust system first draws the external air into the sensor darkroom through the air inlet under the action of its suction; when the suspended dust in the air is irradiated by the parallel light emitted by the laser generator in the darkroom, the scattered light intensity of the dust is proportional to the mass concentration, and the scattered light is converted into a photocurrent through the photoelectric converter, and converted into a photoelectric pulse number proportional to the scattered light intensity through the photocurrent integration circuit of the main control board; the relative mass concentration of the dust can be measured by calculating the number of pulses. The laser dust monitor calculates the detection data by a microprocessor and directly displays it through a high-definition LCD screen, which is convenient for on-site reading and viewing; the laser dust monitor usually has an audible and visual alarm, which has the functions of setting the alarm threshold and high-decibel audible and visual alarm for abnormal concentration.

[0004] Laser dust meters are not convenient for detecting dust concentration in high-humidity air. The moisture in the air can easily form a water film on the optical components, thereby changing the refractive index of the optical components, affecting the transmittance and reflectivity of the optical components, causing the power and accuracy of the laser generator to decrease, thereby affecting the accuracy of detecting dust concentration. Utility Model Content

[0005] The utility model aims to provide a dust concentration detection and early warning device to solve the problem that a laser dust meter is inconvenient to detect the dust concentration in high-humidity air.

[0006] The utility model is realized by the following technical solutions:

[0007] A dust concentration detection and early warning device comprises a laser dust monitor, on which an audible and visual alarm is arranged, an air inlet of the laser dust monitor is connected to an air inlet pipe, a plurality of through holes are respectively provided on an outer wall of the air inlet pipe in the circumferential direction and in the length direction, a mesh basket is provided at each of the through holes, a bottom wall of each of the mesh baskets is located inside the air inlet pipe, gaps are left in the middle of the plurality of mesh baskets for air to pass through, a drying bag is provided inside each of the mesh baskets, and a cover plate is provided at each through hole of the air inlet pipe.

[0008] Furthermore, a metal heat exchange tube is provided at one end of the air inlet pipe away from the laser dust monitor, an outer tube is provided on the outside of the metal heat exchange tube, one end of the outer tube close to the air inlet pipe is connected to a cold water pipe, and the other end is connected to a return water pipe, a cold water tank is provided at one end of the cold water pipe away from the outer tube, the return water pipe is connected to the cold water tank, and a circulating pump is provided on the cold water pipe.

[0009] Furthermore, one end of each cover plate is hinged to the outer wall of the air inlet pipe, and the other end is connected to the outer wall of the air inlet pipe by bolts. A connecting column is provided on the inner side wall of the cover plate, and a limiting plate is provided on the end of the connecting column away from the cover plate. The limiting plate is used to limit the corresponding drying bag near the inner bottom wall of the corresponding net basket.

[0010] Furthermore, a connector is provided at the air inlet of the laser dust monitor, and the connector is threadedly connected to the air inlet pipe.

[0011] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0012] In the utility model, when monitoring the dust content in the air with high humidity, the exhaust system inside the laser dust monitor draws the air in the environment into the intake pipe through the intake pipe. When the high-humidity air passes through multiple drying bags, the drying bags can adsorb the moisture in the high-humidity air, which can effectively reduce the moisture content in the air, and reduce the situation where the moisture in the air adheres to the surface of the optical element when entering the laser dust monitor, thereby affecting the normal detection of the laser dust monitor, which can reduce the influence of humidity on the laser dust monitor, and is conducive to enabling the laser dust monitor to more conveniently detect the dust content in the high-humidity air. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model.

[0014] In the attached picture:

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0016] Figure 2 This is a partial cross-sectional view of Example 1 of the utility model, which is intended to show the positional relationship between the air intake pipe and the drying bag.

[0017] Marks and corresponding parts names in the attached drawings:

[0018] 1. Laser dust monitor; 2. Air inlet pipe; 3. Through hole; 4. Net basket; 5. Drying bag; 6. Cover plate; 7. Metal heat exchange tube; 8. Outer tube; 9. Cold water pipe; 10. Return pipe; 11. Cold water tank; 12. Circulation pump; 13. Connecting column; 14. Limiting plate; 15. Connector. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in combination with the embodiments and drawings. The schematic implementation mode and description of the utility model are only used to explain the utility model and are not intended to limit the utility model. It should be noted that the utility model is already in the actual development and use stage.

[0020] Example 1

[0021] A dust concentration detection and early warning device, referring to Figure 1 , Figure 2 , including a laser dust monitor 1, on which an audible and visual alarm is arranged, an air inlet of the laser dust monitor 1 is connected to an air inlet pipe 2, a plurality of through holes 3 are provided on the outer wall of the air inlet pipe 2 along the circumferential direction and the length direction of the air inlet pipe 2, a mesh basket 4 is provided at each through hole 3, the bottom wall of each mesh basket 4 is located inside the air inlet pipe 2, a gap is left in the middle of the plurality of mesh baskets 4 for air to pass through, a drying bag 5 is provided inside each mesh basket 4, and a cover plate 6 is provided at each through hole 3 of the air inlet pipe 2. When monitoring the dust content in the air with high humidity, the exhaust system inside the laser dust monitor 1 draws the air in the environment into the air intake pipe 2 through the air intake pipe 2. When the high humidity air passes through multiple drying bags 5, the drying bags 5 can adsorb the moisture in the high humidity air, which can effectively reduce the moisture content in the air, reduce the moisture in the air from entering the laser dust monitor 1 and adhering to the surface of the optical element, thereby affecting the normal detection of the laser dust monitor 1, and reduce the influence of humidity on the laser dust monitor 1, which is conducive to enabling the laser dust monitor 1 to detect the dust content in the high humidity air. When the laser dust monitor 1 detects that the dust concentration in the air is higher than the preset threshold, the sound and light alarm is sounded by the sound and light alarm. The drying bag 5 contains a desiccant, and the desiccant can be a silica gel desiccant, a montmorillonite desiccant, an activated carbon desiccant, a mineral desiccant, etc.

[0022] As a preferred embodiment, refer to Figure 1 , Figure 2The end of the air inlet pipe 2 away from the laser dust monitor 1 is connected to a metal heat exchange pipe 7, which can be a steel pipe or a copper pipe. An outer pipe 8 is provided on the outside of the metal heat exchange pipe 7. The end of the outer pipe 8 close to the air inlet pipe 2 is connected to a cold water pipe 9, and the other end is connected to a return pipe 10. The end of the cold water pipe 9 away from the outer pipe 8 is provided with a cold water tank 11. The return pipe 10 is connected to the cold water tank 11, and a circulating pump 12 is provided on the cold water pipe 9. When the temperature and humidity of the air are high, the drying burden of the drying bag 5 is heavier, and the circulation pump 12 can be started at the same time. The circulation pump 12 transports the cold water in the cold water tank 11 to the outer tube 8 through the cold water pipe 9. The cold water exchanges heat with the high-temperature air inside the metal heat exchange tube 7 through the metal heat exchange tube 7, that is, the air is cooled, so that the water vapor in the high-temperature air is condensed into liquid in the metal heat exchange tube 7, reducing the subsequent burden of the drying bag 5 on adsorbing moisture, which is beneficial to extending the effective action period of the drying bag 5; on the other hand, high temperature will cause the semiconductor devices inside the laser dust meter 1 to generate more noise, which will affect the laser waveform. By cooling the air, the adverse effects of high-temperature air on the semiconductor devices inside the laser dust meter 1 can be reduced.

[0023] As a preferred embodiment, refer to Figure 1 , Figure 2 One end of each cover plate 6 is hinged to the outer wall of the air intake pipe 2, and the other end is connected to the outer wall of the air intake pipe 2 by bolts. A connecting column 13 is provided on the inner wall of the cover plate 6. A limiting plate 14 is provided at one end of the connecting column 13 away from the cover plate 6. The limiting plate 14 is used to limit the corresponding drying bag 5 to the inner bottom wall close to the corresponding net basket 4. Each drying bag 5 is at least partially located inside the air intake pipe 2, which is convenient for increasing the contact area between the drying bag 5 and the air inside the air intake pipe 2, thereby facilitating improving the efficiency of the drying bag 5 in absorbing moisture in the air. The drying bag 5 can be easily replaced by opening the cover plate 6.

[0024] As a preferred embodiment, refer to Figure 1 , Figure 2 The air inlet of the laser dust monitor 1 is provided with a connector 15, which is connected to the air inlet pipe 2 by threads. The outer wall of the connector 15 is provided with external threads, and the end of the air inlet pipe 2 close to the laser dust monitor 1 is provided with internal threads, so the connector 15 and the air inlet pipe 2 are detachably connected. When the laser dust monitor 1 detects an object that is not high-humidity and high-temperature air, the air inlet pipe 2 and the metal heat exchange tube 7 can be omitted, and the laser dust monitor 1 and the air inlet pipe 2 can be disassembled, and then the laser dust monitor 1 itself can be used independently.

[0025] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A dust concentration detection and early warning device, comprising a laser dust monitor (1), wherein the laser dust monitor (1) is provided with an audible and visual alarm, characterized in that: The air inlet of the laser dust monitor (1) is connected to an air inlet pipe (2), and the outer wall of the air inlet pipe (2) is provided with a plurality of through holes (3) in the circumferential direction and the longitudinal direction, and a mesh basket (4) is provided at each of the through holes (3). The bottom wall of each of the mesh baskets (4) is located inside the air inlet pipe (2), and a gap for air to pass through is left in the middle of the plurality of mesh baskets (4). A drying bag (5) is provided inside each of the mesh baskets (4), and a cover plate (6) is provided at each of the through holes (3) of the air inlet pipe (2).

2. A dust concentration detection and early warning device according to claim 1, characterized in that: The end of the air inlet pipe (2) away from the laser dust monitor (1) is connected to a metal heat exchange pipe (7), the metal heat exchange pipe (7) is sheathed with an outer pipe (8), the end of the outer pipe (8) close to the air inlet pipe (2) is connected to a cold water pipe (9), and the other end is connected to a return water pipe (10), the end of the cold water pipe (9) away from the outer pipe (8) is provided with a cold water tank (11), the return water pipe (10) is connected to the cold water tank (11), and a circulating pump (12) is provided on the cold water pipe (9).

3. A dust concentration detection and early warning device according to claim 1, characterized in that: One end of each cover plate (6) is hingedly connected to the outer wall of the air intake pipe (2), and the other end is connected to the outer wall of the air intake pipe (2) by bolts. A connecting column (13) is provided on the inner wall of the cover plate (6). A limiting plate (14) is provided at one end of the connecting column (13) away from the cover plate (6). The limiting plate (14) is used to limit the corresponding drying bag (5) to a position close to the inner bottom wall of the corresponding net basket (4).

4. A dust concentration detection and early warning device according to claim 1, characterized in that: A connector (15) is provided at the air inlet of the laser dust monitor (1), and the connector (15) is connected to the air inlet pipe (2) via threads.

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