CN220105803U - Labyrinth structure with low background interference and fire detector with same - Google Patents
Labyrinth structure with low background interference and fire detector with same Download PDFInfo
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- CN220105803U CN220105803U CN202320958395.0U CN202320958395U CN220105803U CN 220105803 U CN220105803 U CN 220105803U CN 202320958395 U CN202320958395 U CN 202320958395U CN 220105803 U CN220105803 U CN 220105803U
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- low background
- light
- background interference
- tooth
- labyrinth structure
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 239000000779 smoke Substances 0.000 claims description 43
- 238000005070 sampling Methods 0.000 claims description 31
- 241000238631 Hexapoda Species 0.000 claims description 14
- 230000002265 prevention Effects 0.000 claims description 14
- 230000000903 blocking effect Effects 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 8
- 241000561734 Celosia cristata Species 0.000 claims description 2
- 210000001520 comb Anatomy 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
The utility model relates to the technical field of fire detectors, and particularly discloses a labyrinth structure with low background interference and a fire detector with the structure. The photoelectric rack is provided with a transmitting tube mounting seat and a receiving tube mounting seat for accommodating the transmitting tube and the receiving tube, the inner peripheral wall of the photoelectric rack is provided with a first toothed portion and a second toothed portion which are in a saw-tooth shape, the first toothed portion is arranged at the position of the transmitting tube and the receiving tube in the opposite direction for transmitting and receiving light, the second toothed portion is arranged at the rest position between the two first toothed portions, and the tooth distance of the first toothed portion is larger than that of the second toothed portion. According to the utility model, the first tooth parts and the second tooth parts with different sizes are arranged, so that the light emitted by the emitting tube is greatly improved by generating the background reflection light when the light irradiates the first tooth parts and the second tooth parts, and the performance of the point smoke-sensing fire detector is better.
Description
Technical Field
The utility model relates to the technical field of fire detectors, and particularly discloses a labyrinth structure with low background interference and a fire detector with the structure.
Background
The photoelectric smoke detector is a device for detecting fire by utilizing the absorption and scattering effects of fire smoke on light, and the spot type smoke detector belongs to the photoelectric smoke detector and consists of a transmitting element, a receiving element, a circuit board, a sampling darkroom and other parts, wherein the outside smoke can enter the darkroom, but light cannot enter the darkroom, so that the interference of ambient light on the receiving element is eliminated.
A smoke-sensing labyrinth as disclosed in patent No. CN211044476U, which comprises a labyrinth upper cover, a labyrinth base, a light emitting device, a light receiving device and a pseudo light source emitting device; the labyrinth base is provided with a labyrinth component along the inner periphery of the bottom surface; the labyrinth component, the labyrinth base and the labyrinth upper cover form a plane labyrinth; the labyrinth component can be formed by a plurality of L-shaped vertical plates, and each L-shaped vertical plate is laminated and arranged, so that the light can not irradiate in although gaps exist between the L-shaped vertical plates, and smoke particles can conveniently enter the smoke sensing labyrinth and are protected from light.
Although this patent shields the irradiation influence of external environment light by providing the labyrinth member, after the smoke particles entering the interior of the labyrinth are irradiated by the transmitting tube, scattered light rays are further reflected when the scattered light rays are irradiated to the surfaces of the labyrinth upper cover and the labyrinth base, and the light intensity loss is increased by these background reflected light rays, so that the performance of the smoke detector is influenced, and therefore, further improvement is required.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a labyrinth structure with low background interference and a fire detector with the structure.
On one hand, the utility model discloses a labyrinth structure with low background interference, which adopts the following technical scheme:
a low background interference labyrinth structure comprising: the photoelectric frame and the insect prevention cover of mutual lock, be equipped with smog sampling groove on the photoelectric frame, be equipped with the diaphragm in the insect prevention cover, diaphragm and smog sampling groove constitute the maze darkroom jointly, be equipped with transmitting tube and receiver tube on the smog sampling groove, smog sampling groove's inner peripheral wall interval is equipped with first tooth portion and the second tooth portion of cockscomb structure, the tooth pitch of first tooth portion is greater than the tooth pitch of second tooth portion.
Preferably, the first teeth are arranged at positions of the emitting tube and the receiving tube in the opposite directions of light emission and light receiving, and the second teeth are arranged at the rest positions between the two first teeth.
Preferably, the pitch p of the first tooth part 1 P is 1mm or less 1 Less than or equal to 3mm; the pitch p of the second tooth part 2 Is 0mm < p 2 ≤1mm。
Preferably, the inner peripheral wall of the light shielding ring is provided with a serrated third tooth part.
Preferably, the inner top wall of the shading ring is provided with a serrated fourth tooth part.
Preferably, the distance delta H between the ray junction point of the emitting tube and the receiving tube and the bottom wall of the smoke sampling groove is set to be more than or equal to 5mm and less than or equal to 22mm.
Preferably, a plurality of clapboards are arranged between the outer wall of the diaphragm and the inner wall of the insect prevention cover at intervals in the circumferential direction, and a plurality of smoke channels are formed by separating the diaphragm and the insect prevention cover through a plurality of clapboards.
Further preferably, the lower end of the light shielding ring extends into the smoke sampling groove, an avoidance notch is formed in the top of the smoke sampling groove, and the lower end of the partition plate is inserted into the avoidance notch.
Preferably, a light blocking sheet is arranged on the smog sampling groove and positioned at the light intersection of the transmitting pipe and the receiving pipe, and the light blocking sheet is of a Y-shaped structure.
In another aspect, the present utility model discloses a spot-type smoke-sensing fire detector comprising the spot-type smoke-sensing fire detector labyrinth structure described above.
Compared with the prior art, the utility model at least comprises the following beneficial effects:
according to the utility model, the sawtooth-shaped first tooth parts and the sawtooth-shaped second tooth parts are arranged on the peripheral wall of the smoke sampling groove, so that the background reflection light generated when the light emitted by the emitting tube irradiates the peripheral wall of the smoke sampling groove is greatly improved, the reflection effect of the light can be further improved by the design of the first tooth parts and the second tooth parts with different sizes, and invalid light is lost in multiple reflection, so that the background light formed by diffuse reflection is weakened, the accuracy of the receiving tube for capturing and receiving scattered light is improved, and the performance of the point-type smoke-sensing fire detector is better.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a labyrinth structure with low background interference in embodiment 1;
FIG. 2 is a cross-sectional view of a low background interference labyrinth structure of example 1;
FIG. 3 is a schematic view of a low background interference labyrinth structure of the photovoltaic rack according to embodiment 1;
FIG. 4 is a schematic diagram of an insect-proof cover with a labyrinth structure with low background interference in embodiment 1;
FIG. 5 is a cross-sectional view of a low background interference labyrinth structure of example 2;
FIG. 6 is a schematic view of a low background interference labyrinth structure of an optoelectronic shelf according to example 2;
FIG. 7 is a schematic diagram of a point-type smoke-sensing fire detector according to the embodiment.
Reference numerals illustrate:
1. a photovoltaic rack; 11. a smoke sampling groove; 12. a transmitting tube mounting seat; 13. a receiving tube mount; 14. a light blocking sheet; 15. avoiding the notch; 16. a lateral gap; 2. an insect prevention cover; 21. a diaphragm; 22. a partition plate; 3. a first tooth portion; 4. a second tooth portion; 5. a third tooth portion; 6. fourth tooth portion.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
Example 1
A labyrinth structure with low background interference is shown in figures 1-4, and comprises a photoelectric frame 1 and an insect prevention cover 2, wherein the photoelectric frame 1 and the insect prevention cover 2 are mutually buckled to form a labyrinth cavity. The photoelectric frame 1 is provided with a smoke sampling groove 11, the smoke sampling groove 11 is provided with a transmitting tube mounting seat 12 and a receiving tube mounting seat 13, and the transmitting tube mounting seat 12 and the receiving tube mounting seat 13 are respectively used for mounting a transmitting tube and a receiving tube, and the ray track of the transmitting tube and the ray track of the receiving tube are in the same horizontal plane; an aperture ring 21 is arranged in the insect prevention cover 2, and a transverse gap 16 for smoke to enter the labyrinth darkroom is reserved between the aperture ring 21 and the smoke sampling groove 11. The labyrinth structure formed by the photoelectric frame 1 and the insect prevention cover 2, the smoke sampling groove 11 and the aperture 21 form a labyrinth darkroom together, so that external smoke can enter, but external light can not enter, and the light emitted by the emitting tube in the darkroom irradiates smoke particles, so that the light is scattered and captured and received by the receiving tube, and further the smoke concentration of the environment is detected to judge fire conditions.
Referring to fig. 3, a light blocking sheet 14 is disposed in the middle of the smoke sampling groove 11, the light blocking sheet 14 is located at the intersection of the light of the emitting tube and the light of the receiving tube, in this embodiment, the light blocking sheet is of a Y-shaped structure, and the light blocking sheet 14 prevents the light of the emitting tube from directly irradiating the receiving tube, thereby improving the detection accuracy of the smoke concentration.
Referring to fig. 3, in order to reduce the influence of the background reflected light on the detection of the concentration of the smoke particles, the inner peripheral wall of the smoke sampling groove 11 is provided with a first tooth portion 3 and a second tooth portion 4 in a zigzag shape at intervals, and the pitch of the first tooth portion 3 is larger than that of the second tooth portion 4. The pitch p of the first tooth 3 1 Preferably 1 mm.ltoreq.p 1 The pitch p of the second tooth part 4 is less than or equal to 3mm 2 Preferably 0mm < p 2 Is less than or equal to 1mm. The strong infrared light that the transmitting tube sent out can be effectively absorbed by first tooth portion 3 and second tooth portion 4 to the tooth design of first tooth portion 3 and second tooth portion 4 is the different for the size, has aggravated the degree of complexity of N diffuse reflection, makes invalid light at multiple reflection loss, thereby has weakened the backlight that diffuse reflection formed, has played excellent low background light interference effect.
Preferably, the first teeth 3 are arranged at two positions of the emitting tube and the receiving tube in the opposite directions of light emission and light receiving, and the second teeth 4 are arranged at the rest positions between the two first teeth 3. Because the tooth pitch of the first tooth part 3 is larger than the tooth pitch of the second tooth part 4, the light ray scattered or absorbed by the first tooth part 3 is higher, so that the first and last diffuse reflection effects of infrared light are better improved, the background light interference on the ray intersection detection area of the transmitting tube and the receiving tube is reduced to be extremely low, and the detection accuracy performance is more ideal.
Referring to fig. 3 and 4, in order to further reduce the reflected light, the inner peripheral wall of the aperture 21 is provided with a third tooth portion 5 having a saw-tooth shape, and the inner top wall of the aperture 21 is provided with a fourth tooth portion 6 having a saw-tooth shape. The third tooth part 5 and the fourth tooth part 6 can reduce the reflected light interference above the ray intersection of the transmitting tube and the receiving tube. Secondly, the bottom wall of the photoelectric frame 1 of the embodiment is designed to form a smoke sampling groove 11 for sinking, and a height delta H of 5 mm-22 mm is reserved between the bottom wall of the smoke sampling groove 11 and the ray junction of the transmitting tube and the receiving tube, so that the reflected ray interference below the ray junction of the transmitting tube and the receiving tube is reduced.
The outer wall of the diaphragm 21 to the inner wall of the insect prevention cover 2 are circumferentially provided with a plurality of partition plates 22, the diaphragm 21 and the insect prevention cover 2 are separated by the plurality of partition plates 22 to form a plurality of smoke channels, and by arranging the partition plates 22, external environment smoke particles can enter the labyrinth darkroom more uniformly and stably through the smoke channels, so that the scattering effect in the labyrinth darkroom is more stable, the generation of background reflection light is further reduced, and the detection reliability is improved.
Example 2
The labyrinth structure with low background interference is different from embodiment 1 in that the top end of the smoke sampling groove 11 on the photoelectric frame 1 is arranged in a protruding manner, the top of the smoke sampling groove 11 is provided with an avoidance notch 15, the lower end of the partition plate 22 can extend downwards to be inserted into the avoidance notch 15, so that the space of the smoke channel is larger, the uniformity of smoke particle sampling is improved, moreover, the partition plate 22 and the avoidance notch 15 are matched, the buckling stability between the photoelectric frame 1 and the insect prevention cover 2 is better, the rapid and accurate installation of workers can be assisted, and the production efficiency is improved.
Example 3
As shown in FIG. 7, the spot-type smoke-sensing fire detector has the performance advantages of high smoke detection sensitivity and good accuracy by applying the labyrinth structure.
The foregoing has outlined rather broadly the more detailed description of the utility model in order that the detailed description of the utility model that follows may be better understood, and in order that the present principles and embodiments may be better understood; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.
Claims (10)
1. A low background interference labyrinth structure comprising: the photoelectric frame and the insect prevention cover of mutual lock, be equipped with smog sampling groove on the photoelectric frame, be equipped with the diaphragm in the insect prevention cover, diaphragm and smog sampling groove constitute the maze darkroom jointly, be equipped with transmitting tube and receiver tube on the smog sampling groove, its characterized in that, smog sampling groove's inner peripheral wall interval is equipped with first tooth portion and the second tooth portion of cockscomb structure, the tooth pitch of first tooth portion is greater than the tooth pitch of second tooth portion.
2. The low background interference labyrinth structure of claim 1, wherein said first teeth are disposed at positions of the emitting tube and receiving tube in opposite directions of light emission and reception, and said second teeth are disposed at the rest positions between two of said first teeth.
3. The low background interference labyrinth structure of claim 1, wherein the pitch p of the first teeth 1 P is 1mm or less 1 Less than or equal to 3mm; the pitch p of the second tooth part 2 Is 0mm < p 2 ≤1mm。
4. The labyrinth structure of claim 1, wherein the inner peripheral wall of the light shielding ring is provided with a third tooth portion having a saw tooth shape.
5. The low background interference labyrinth structure of claim 1, wherein the inner top wall of the light shielding ring is provided with a fourth tooth portion having a saw tooth shape.
6. The labyrinth structure with low background interference according to claim 1, wherein the distance Δh from the ray junction of the emitting tube and the receiving tube to the bottom wall of the smoke sampling tank is set to be 5 mm-22 mm.
7. The labyrinth structure with low background interference according to claim 1, wherein a plurality of baffles are circumferentially arranged between the outer wall of the diaphragm and the inner wall of the insect-proof cover at intervals, and a plurality of smoke passages are formed by separating the diaphragm and the insect-proof cover by a plurality of baffles.
8. The labyrinth structure with low background interference according to claim 7, wherein the lower end of the light shielding ring extends into the smoke sampling groove, an avoidance notch is formed in the top of the smoke sampling groove, and the lower end of the partition plate is inserted into the avoidance notch.
9. The labyrinth structure with low background interference according to claim 1, wherein a light blocking sheet is arranged on the smoke sampling groove, the light blocking sheet is positioned at the light intersection of the emitting tube and the receiving tube, and the light blocking sheet is of a Y-shaped structure.
10. A fire detector comprising a low background interference labyrinth as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320958395.0U CN220105803U (en) | 2023-04-23 | 2023-04-23 | Labyrinth structure with low background interference and fire detector with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320958395.0U CN220105803U (en) | 2023-04-23 | 2023-04-23 | Labyrinth structure with low background interference and fire detector with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220105803U true CN220105803U (en) | 2023-11-28 |
Family
ID=88870011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320958395.0U Active CN220105803U (en) | 2023-04-23 | 2023-04-23 | Labyrinth structure with low background interference and fire detector with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220105803U (en) |
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2023
- 2023-04-23 CN CN202320958395.0U patent/CN220105803U/en active Active
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