A portable dust detector

Abstract

The application discloses a portable dust detector, which comprises a detection outer cylinder, a holding handle arranged at one end of the detection outer cylinder, a detection channel arranged in the middle of the detection outer cylinder and penetrating in the radial direction, a first installation chamber and a second installation chamber arranged on the detection outer cylinder and communicating with the detection channel, a light source, a collimating lens and a light blocking sheet sequentially arranged in the first installation chamber, a small hole arranged in the center of the light blocking sheet and the light blocking sheet arranged on the side close to the detection channel, a light trap, a focusing lens group and a light receiver sequentially arranged in the transmission direction of the light in the second installation chamber, the light trap arranged on the side close to the detection channel, the light trap arranged in the middle of the focusing lens group and corresponding to the small hole on the light blocking sheet, a battery arranged in the holding handle, an axial threading hole arranged on the detection outer cylinder, and the light receiver and the light source connected with the battery. The portable dust detector is simple to use and portable.

Description

Technical Field

[0001] This invention relates to the field of dust detection technology, and in particular to a portable dust detector. Background Technology

[0002] Currently, dust particulate matter concentration detection in the environment mainly relies on dust concentration detectors. For example, patent application CN201721218267.3 discloses a dust concentration detector device that primarily uses the principle of light scattering. However, this device requires additional sampling tubes, sampling pumps, and other accessories, resulting in a relatively large overall size and reduced portability. This is inconvenient for law enforcement personnel conducting on-site inspections. Such devices are generally suitable for long-term monitoring at fixed locations. For temporary, unforeseen inspections, the large size, portability, and need for on-site assembly make these devices unusable. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a portable dust detector that is very small and portable, and can conveniently detect particulate matter in flowing air, so as to meet the needs of law enforcement officers for rapid on-site detection.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a portable dust detector, comprising a cylindrical detection outer cylinder, one end of which is provided with a handle for easy gripping, and a radially penetrating detection channel in the middle of the outer cylinder. A first mounting chamber and a second mounting chamber, communicating with the detection channel, are respectively provided on both sides of the detection channel on the outer cylinder. In the first mounting chamber, a light source, a collimating lens, and a light-blocking plate are sequentially installed according to the direction of light transmission. A small hole is provided at the center of the light-blocking plate to facilitate light passage, and the light-blocking plate is located on the side closer to the detection channel. In the second mounting chamber, a light trap, a focusing lens group, and a light receiver located at the focal point of the focusing lens group are sequentially installed according to the direction of light transmission. The light trap is located on the side closer to the detection channel, in the middle of the focusing lens group, and corresponds to the small hole on the light-blocking plate. A battery is installed inside the handle. An axial through-hole connecting the first and second mounting chambers is provided on the outer cylinder. The axial through-hole is independent of the detection channel. The light receiver and the light source are both connected to the battery.

[0005] As a more preferred embodiment, the outer detection cylinder is provided with a light-passing hole, which connects the first mounting chamber and the detection channel. The diameter of the first mounting chamber is larger than the diameter of the light-passing hole, forming a mounting step. There are two light-blocking plates. A partition block is installed in the first mounting chamber. The partition block is provided with a central through hole to facilitate the passage of light. The partition block presses one of the light-blocking plates onto the mounting step. The collimating lens is fixed on the collimating lens mounting base. The other light-blocking plate is pressed between the partition block and the collimating lens mounting base.

[0006] As a more preferred embodiment, the collimating lens mounting base is also provided with a through hole to facilitate the passage of light. The upstream end face of the collimating lens mounting base is provided with a first mounting groove to facilitate the collimating lens. The light source is fixed on the light source mounting base. The downstream end of the light source mounting base is provided with a second mounting groove to facilitate the installation of the collimating lens. The collimating lens is installed in the first mounting groove and the second mounting groove.

[0007] As a more preferred embodiment, the light source mounting base includes an outer base, an inner base, and a fixing cover plate. The outer base is inserted into the first mounting cavity, and the second mounting groove is disposed on the outer base. A connecting flange is threaded to the upstream end of the outer base. The inner base is inserted into the outer base, and a light source fixing groove is provided on the inner base to facilitate the fixing of the light source. The light source is fixed in the light source fixing groove. The fixing cover plate is detachably fixed to the inner base to press and fix the light source. A light-emitting circuit board is fixed to the end of the detection outer cylinder, and an end cover that seals the light-emitting circuit board and the fixing cover plate is also fixed to the end of the detection outer cylinder.

[0008] As a more preferred embodiment, the focusing lens group includes a focusing lens mounting base, with an upstream lens mounting groove and a downstream lens mounting groove respectively provided upstream and downstream of the focusing lens mounting base. An upstream convex lens and a downstream convex lens are embedded and fixed in the upstream lens mounting groove and the downstream lens mounting groove, with the convex surfaces of the upstream convex lens and the downstream convex lens arranged opposite to each other. The light trap is fixed on the upper end plane of the upstream convex lens and located at the center of the upstream convex lens.

[0009] As a more preferred embodiment, the light receiver is fixed to the lens spacer, the lens spacer is provided with a conical through hole, the small diameter end of the conical through hole is located on the downstream side, the light receiver is fixed inside the small diameter end of the conical through hole, the detector outer cylinder is fixed with a downstream end cap that presses the light receiver tightly, and a filter is provided in the conical through hole upstream of the light receiver.

[0010] After adopting the above technical solution, the effect of the present invention is as follows: The portable dust detector includes a cylindrical detection outer cylinder. One end of the outer cylinder is provided with a handle for easy gripping. A radially penetrating detection channel is provided in the middle of the outer cylinder. A first mounting chamber and a second mounting chamber, communicating with the detection channel, are respectively provided on both sides of the detection channel on the outer cylinder. In the first mounting chamber, a light source, a collimating lens, and a light-blocking plate are sequentially installed according to the light transmission direction. The light-blocking plate has a small hole at its center to facilitate light passage and is located on the side closer to the detection channel. In the second mounting chamber, a light trap, a focusing lens group, and a light receiver located at the focal point of the focusing lens group are sequentially installed according to the light transmission direction. The light trap is located on the side closer to the detection channel and is located in the middle of the focusing lens group, corresponding to the small hole on the light-blocking plate. A battery is installed inside the handle. The outer cylinder is provided with a connection between the first and second mounting chambers. The chamber has an axial wire hole, which is independent of the detection channel. The light receiver and the light source are both connected to the battery. Therefore, in use, the portable dust detector is inserted into a flowing airflow, such as into a chimney or exhaust pipe, with the detection channel facing the flow direction. The dust-laden airflow flows through the detection channel, and the light generated by the light source passes through the detection channel. When there are no particles in the airflow, the light directly enters the light trap and is absorbed. When particles in the dust-laden airflow pass through the detection channel, the light shines on the particles, forming scattered light. Then, the dissipated light passes through the focusing lens group and is received by the light receiver. The light intensity received by the light receiver can detect the amount of particles and ultimately the concentration of particles. Of course, a sampling pump can also be configured to sample the airflow obtained from the environment being detected and introduce it into the detection channel. This allows the detection of dust concentration in environments without airflow. This portable dust detector is simple to use and easy to operate.

[0011] Furthermore, since the outer cylinder of the detector is provided with a light-passing hole, which connects the first mounting chamber and the detection channel, and the diameter of the first mounting chamber is larger than the diameter of the light-passing hole, forming a mounting step, and there are two light-blocking plates, a partition block is installed in the first mounting chamber, and the partition block is provided with a central through hole to facilitate the passage of light, the partition block presses one of the light-blocking plates tightly onto the mounting step, the collimating lens is fixed on the collimating lens mounting base, and the other light-blocking plate is pressed between the partition block and the collimating lens mounting base. Therefore, by using two light-blocking plates, other scattered light rays can be constrained, ensuring that a relatively concentrated beam of light passes through the detection channel, thus ensuring the accuracy of the detection.

[0012] Furthermore, since the light source mounting base includes an outer base, an inner base, and a fixing cover plate, the outer base is inserted into the first mounting cavity, the second mounting groove is provided on the outer base, and a connecting flange is threaded to the upstream end of the outer base. The inner base is inserted into the outer base, and a light source fixing groove is provided on the inner base to facilitate the fixing of the light source. The light source is fixed in the light source fixing groove, and the fixing cover plate is detachably fixed on the inner base to press and fix the light source. A light-emitting circuit board is fixed to the end of the detection outer cylinder, and an end cover that seals the light-emitting circuit board and the fixing cover plate is also fixed to the end of the detection outer cylinder. This light source mounting base can be better fixed on the detection outer cylinder, and the end cover protects the internal light source. The disassembly and replacement of the light source are also more convenient.

[0013] Furthermore, since the light receiver is fixed on the lens spacer, and the lens spacer is provided with a conical through hole, the small diameter end of the conical through hole is located on the downstream side. The light receiver is fixed inside the small diameter end of the conical through hole, and the detector outer cylinder is fixed with a downstream end cap that presses the light receiver tightly. A filter is provided in the conical through hole upstream of the light receiver. The conical through hole can facilitate the collection of light, while the filter can filter out interfering light. This ensures that the light receiver can receive the specified light more accurately, reduces interference, and ensures the accuracy of detection. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the present invention;

[0016] Figure 2 yes Figure 1 Structural cross-sectional view along AA;

[0017] Figure 3 yes Figure 1 The left view;

[0018] Figure 4 yes Figure 3 Structural cross-sectional view along BB;

[0019] Figure 5 yes Figure 4 Enlarged view of the structure at point C;

[0020] In the attached diagram: 1. Detector outer cylinder; 2. Handle; 3. Detection channel; 4. Light source; 5. Collimating lens; 6. Light-blocking plate; 7. Light trap; 8. Focusing lens group; 81. Focusing lens mounting base; 82. Upstream convex lens; 83. Downstream convex lens; 9. Light receiver; 10. Battery mounting slot; 11. Axial wire hole; 12. Light beam through hole; 13. Dividing block; 14. Collimating lens mounting base; 15. First mounting groove; 16. Second mounting groove; 17. Outer seat; 18. Inner seat; 19. Fixing cover plate; 20. Light-emitting circuit board; 21. End cover; 22. Lens spacer; 23. Downstream end cover; 24. Filter; 25. Central through hole. Detailed Implementation

[0021] The present invention will be further described in detail below through specific embodiments.

[0022] like Figure 1-5 As shown, a portable dust detector includes a cylindrical detection outer cylinder 1. One end of the outer cylinder 1 has a handle 2 for easy gripping. A radially penetrating detection channel 3 is provided in the middle of the outer cylinder 1. A first mounting chamber and a second mounting chamber, communicating with the detection channel 3, are respectively provided on both sides of the outer cylinder 1. In the first mounting chamber, a light source 4, a collimating lens 5, and a light-blocking plate 6 are sequentially installed according to the light transmission direction. The light-blocking plate 6 has a small hole at its center to facilitate light passage and is located on the side closest to the detection channel 3. The second mounting chamber... Indoor installations are equipped with a light trap 7, a focusing lens group 8, and a light receiver 9 located at the focal point of the focusing lens group 8, arranged sequentially in the direction of light transmission. The light trap 7 is located on the side close to the detection channel 3, and is located in the middle of the focusing lens group 8, corresponding to the small hole on the light-blocking plate 6. The handle 2 has a battery mounting slot 10 inside, which can be used to install a battery. The outer detection cylinder 1 has an axial through hole 11 connecting the first and second installation chambers. The axial through hole 11 is independent of the detection channel 3. The light receiver 9 and the light source 4 are both connected to the battery.

[0023] In this embodiment, a light-passing hole 12 is provided on the outer cylinder 1, which connects the first mounting chamber and the detection channel 3. The diameter of the first mounting chamber is larger than the diameter of the light-passing hole 12, forming a mounting step. There are two light-blocking plates 6. A partition block 13 is installed in the first mounting chamber. The partition block 13 has a central through-hole 25 to facilitate the passage of light. The partition block 13 presses one of the light-blocking plates 6 onto the mounting step. The collimating lens 5 is fixed on the collimating lens mounting base 14, and the other light-blocking plate 6 is pressed between the partition block 13 and the collimating lens mounting base 14. The collimating lens mounting base 14 also has a through-hole to facilitate the passage of light. A first mounting groove 15 to facilitate the collimating lens 5 is provided on the upstream end face of the collimating lens mounting base 14. The light source 4 is fixed on the light source 4 mounting base. A second mounting groove 16 to facilitate the installation of the collimating lens 5 is provided on the downstream end of the light source 4 mounting base. The collimating lens 5 is installed in the first mounting groove 15 and the second mounting groove 16.

[0024] The light source mounting base includes an outer base 17, an inner base 18, and a fixing cover plate 19. The outer base 17 is inserted into the first mounting cavity, and the second mounting groove 16 is disposed on the outer base 17. A connecting flange is threaded to the upstream end of the outer base 17. The inner base 18 is inserted into the outer base 17. The inner base 18 is provided with a light source fixing groove for convenient fixing of the light source 4. The light source 4 is fixed in the light source fixing groove. The fixing cover plate 19 is detachably fixed on the inner base 18 to press and fix the light source 4. A light-emitting circuit board 20 is fixed to the end of the detection outer cylinder 1. An end cover 21 that seals the light-emitting circuit board 20 and the fixing cover plate 19 is also fixed to the end of the detection outer cylinder 1.

[0025] The focusing lens group 8 includes a focusing lens mounting base 81. An upstream lens mounting groove and a downstream lens mounting groove are respectively provided upstream and downstream of the focusing lens mounting base 81. An upstream convex lens 82 and a downstream convex lens 83 are embedded and fixed within the upstream and downstream lens mounting grooves, with their convex surfaces facing each other. The light trap 7 is fixed on the upper plane of the upstream convex lens 82 and located at the center of the upstream convex lens 82. A light receiver 9 is fixed on a lens spacer 22, which has a conical through-hole. The small-diameter end of the conical through-hole is located downstream. The light receiver 9 is fixed inside the small-diameter end of the conical through-hole. A downstream end cap 23 is fixed on the outer detection cylinder 1 to press the light receiver 9 tightly. A filter 24 is provided upstream of the light receiver 9 within the conical through-hole.

[0026] In use, the portable dust detector is inserted into the flowing airflow, with the detection channel 3 aligned with the flow direction. The dust-laden airflow flows through the detection channel 3, and the light generated by the light source 4 passes through the detection channel 3. When there are no particles in the airflow, the light directly enters the light trap 7 and is absorbed. When there are particles, the light will irradiate the particles after they flow through the detection channel 3, forming scattered light. The dissipated light passes through the upstream convex lens 82 and the downstream convex lens 83 of the focusing lens group 8 and is received by the light receiver 9. In this way, the light intensity received by the light receiver 9 can detect the amount of particles and ultimately detect the concentration of particles.

[0027] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and alterations made to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A portable dust detector, characterized in that: The device includes a cylindrical detection outer cylinder with a handle at one end for easy gripping. A radially penetrating detection channel is located in the middle of the outer cylinder. A first mounting chamber and a second mounting chamber, communicating with the detection channel, are respectively located on either side of the detection channel. In the first mounting chamber, a light source, a collimating lens, and a light-blocking plate are sequentially installed according to the light transmission direction. The light-blocking plate has a small hole at its center to facilitate light passage and is located near the detection channel. In the second mounting chamber, a light trap, a focusing lens group, and a light receiver located at the focal point of the focusing lens group are sequentially installed according to the light transmission direction. The light trap is located near the detection channel and is situated in the middle of the focusing lens group, corresponding to the small hole on the light-blocking plate. A battery is installed inside the handle. An axial through-hole connecting the first and second mounting chambers is provided on the outer cylinder. This axial through-hole is independent of the detection channel. The light receiver and the light source are both connected to the battery. The outer detection cylinder is provided with a light-passing hole, which connects the first mounting chamber and the detection channel. The diameter of the first mounting chamber is larger than the diameter of the light-passing hole, forming a mounting step. Two light-blocking plates are provided. A partition block is installed inside the first mounting chamber, and the partition block has a central through-hole to facilitate light passage. The partition block presses one of the light-blocking plates firmly onto the mounting step. The collimating lens is fixed to the collimating lens mounting base, and the other light-blocking plate is pressed between the partition block and the collimating lens mounting base. The focusing lens assembly includes a focusing lens mounting base. An upstream lens mounting groove and a downstream lens mounting groove are respectively provided upstream and downstream of the focusing lens mounting base. An upstream convex lens and a downstream convex lens are embedded and fixed within the upstream and downstream lens mounting grooves, with their convex surfaces facing each other. The light trap is fixed on the upper end plane of the upstream convex lens and located at the center of the upstream convex lens. The light receiver is fixed on the lens spacer, which has a conical through hole. The small diameter end of the conical through hole is located on the downstream side. The light receiver is fixed inside the small diameter end of the conical through hole. A downstream end cap that presses the light receiver is fixed on the outer detection cylinder. A filter is provided in the conical through hole upstream of the light receiver.

2. The portable dust detector as described in claim 1, characterized in that: The collimating lens mounting base is also provided with a through hole to facilitate the passage of light. The upstream end face of the collimating lens mounting base is provided with a first mounting groove to facilitate the collimating lens. The light source is fixed on the light source mounting base. The downstream end of the light source mounting base is provided with a second mounting groove to facilitate the installation of the collimating lens. The collimating lens is installed in the first mounting groove and the second mounting groove.

3. A portable dust detector as described in claim 2, characterized in that: The light source mounting base includes an outer base, an inner base, and a fixing cover plate. The outer base is inserted into the first mounting cavity, and the second mounting groove is disposed on the outer base. A connecting flange is threaded to the upstream end of the outer base. The inner base is inserted into the outer base, and a light source fixing groove is provided on the inner base to facilitate the fixing of the light source. The light source is fixed in the light source fixing groove. The fixing cover plate is detachably fixed on the inner base to press and fix the light source. A light-emitting circuit board is fixed to the end of the detection outer cylinder, and an end cover that seals the light-emitting circuit board and the fixing cover plate is also fixed to the end of the detection outer cylinder.

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