Point-type smoke-sensing fire detector

Abstract

The utility model relates to the technical field of fire detectors, and specifically discloses a point-type smoke-sensing fire detector. The utility model relates to a smoke exhaust ventilator which comprises a base and an upper shell which are buckled with each other, a labyrinth and a PCB arranged in the labyrinth are arranged between the base and the upper shell, the upper shell is provided with a smoke inlet communicated with the labyrinth, the PCB is electrically connected with a light transmitting tube and a light receiving tube, and the light transmitting tube and the light receiving tube both comprise transmitting ends and welding parts. A standing part attached to the PCB is arranged between the transmitting end and the welding part, and the included angle between the ray of the transmitting end and the plane where the PCB is located is 0 + / -10 degrees. According to the utility model, the standing part is arranged between the transmitting end and the welding part, so that the light transmitting tube and the light receiving tube can be flatly placed on the surface of the PCB through the standing part, the double tubes and the PCB can be welded in a batch chip mounting mode on a chip mounter, the structure of the detector is simplified, the yield and the production efficiency are improved, and the production cost is reduced. And the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fire detectors, and specifically discloses a point-type smoke fire detector. Background Art

[0002] In the existing smoke detector, the transmitting tube and the receiving tube are connected to the circuit board by welding. For example, Patent 202223298320.9 discloses a smoke alarm with a split-type smoke inlet chamber, which includes: a base, a photoelectric induction component installed on the base, and a housing. The photoelectric induction component includes a circuit board, a smoke inlet chamber installed on the circuit board, and a transmitting tube and a receiving tube arranged in the smoke inlet chamber and electrically connected to the circuit board. The smoke inlet chamber includes a photoelectric frame, a smoke inlet chamber bracket installed on the photoelectric frame, and a smoke inlet chamber upper cover installed on the smoke inlet chamber bracket. A communication hole is opened at the bottom of the smoke inlet chamber bracket, and the communication hole is aligned with the transmitting end of the transmitting tube and the receiving end of the receiving tube on the photoelectric frame.

[0003] Since the pins of the existing transmitting tube and receiving tube are difficult to stand firm, it is necessary to use a photoelectric frame for welding, resulting in low welding efficiency and being not conducive to the simplification of the structure.

[0004] Regarding the problem of low welding efficiency, Patent 201921766249.8 discloses a point-type photoelectric smoke detector with the same sensitivity to black smoke and white smoke, which includes: a detector and a detector base. The detector is snap-fitted on the detector base. The detector includes a detector upper cover, a maze, and a circuit board arranged in the maze. A patch type light emitting tube and a patch type light receiving tube are attached to the circuit board; the maze is installed in the detector upper cover; the maze includes a maze cover and a maze base snap-fitted with the maze cover. The top surface of the maze cover is an insect-proof net. A light emitting component and a light receiving component are arranged in the maze. The light emitting component finally forms a conical main light emitting path with the light emitting surface as the bottom surface; the light receiving component finally forms a conical main light receiving path with the center of the light receiving surface of the light receiving tube as the cone apex. The area where the scattered light of the main light emitting path can irradiate the light receiving surface of the light receiving component is the smoke detection area.

[0005] Different from the optical reflection tube and the optical receiving tube, the detector of this patent uses a patch optical emitter and a patch optical receiver. During the process of manufacturing the circuit board, the patch optical emitter and the patch optical receiver can be directly attached to the circuit board without manual installation or soldering, reducing labor costs and manual assembly time. However, due to the limited light emission and reception ranges of its patch optical emitter and patch optical receiver, additional light emitter light guide columns and light receiver light guide columns need to be installed. By using the reflecting surfaces of the light guide columns, the paths of the emitted light and the received light are changed to irradiate the emitted light and the received light paths into the smoke detection area. Therefore, the light guide columns and the patch optical emitter / receiver must be accurately aligned during installation. Otherwise, it will affect their consistency, be unfavorable to the detection sensitivity of the detector, have high installation requirements and be unfavorable to the product yield. Moreover, the added light guide columns are also unfavorable to the structural simplification and cost.

[0006] Therefore, there is a need to develop a new point-type smoke fire detector that not only has the advantage of simplified structure but also can meet the production requirements of mass patch mounting to improve production efficiency. Summary of the Utility Model

[0007] The purpose of the present utility model is to overcome the deficiencies of the prior art and provide a point-type smoke fire detector.

[0008] The present utility model discloses a point-type smoke fire detector, adopting the following technical solution:

[0009] A point-type smoke fire detector includes a base and an upper shell that are buckled with each other. A maze and a PCB board arranged in the maze are provided between the base and the upper shell. The upper shell is provided with a smoke inlet communicating with the maze. A light emitter and a light receiver are electrically connected to the PCB board. Both the light emitter and the light receiver include an emission end and a welding part. A standing part that abuts against the PCB board is provided between the emission end and the welding part. The included angle between the ray of the emission end and the plane where the PCB board is located is 0 ± 10°.

[0010] Preferably, the standing part is a square block, and the emission end and the welding part are respectively arranged on two opposite transverse faces of the square block.

[0011] Preferably, the welding part is a pin. The tail end of the pin away from the standing part is bent and extended to form an auxiliary part. The bottom surface of the auxiliary part is flush with the bottom surface of the standing part, and the auxiliary part abuts against the PCB board for electrical connection.

[0012] Preferably, the bottom end of the emission end is flush with the bottom surface of the standing part, and the emission end abuts against the PCB board.

[0013] Preferably, a sinking detection area is provided in the maze, and the height difference between the plane where the transmitting end is located and the plane where the bottom of the sinking detection area is located is 3 to 10 mm.

[0014] Preferably, the maze includes a maze seat and a maze cover installed on the maze seat, the top surface of the maze cover is provided with an insect-proof net, the upper shell is provided with an inverted conical smoke guiding structure, the cone top of the conical smoke guiding structure abuts the middle part of the insect-proof net, and the conical smoke guiding structure forms an inclined smoke guiding surface on the side facing the insect-proof net, the smoke inlet is arranged on the outer periphery of the upper shell, and the smoke guiding surface is arranged opposite to the smoke inlet, and the smoke enters from the smoke inlet and enters the maze along the smoke guiding surface.

[0015] Preferably, two light shields are provided in the labyrinth cover, the light emitting tube and the light receiving tube are placed in the two light shields respectively, and a notch is provided on the light shield for exposing the emitting end.

[0016] Preferably, a plurality of first partitions are provided below the smoke guide surface, and the plurality of first partitions separate the space enclosed by the inner top wall of the upper shell, the smoke guide surface and the insect-proof net into a plurality of smoke inlet cavities, and the smoke inlet cavities are connected to the smoke inlet port.

[0017] Preferably, second partitions are provided at intervals on the bottom surface of the insect-proof net, and a plurality of the second partitions are connected one by one with a plurality of the first partitions.

[0018] Preferably, the labyrinth seat is snap-connected to the upper shell to fix the labyrinth cover and the PCB board inside; the upper shell is provided with a snap-connecting block, and the base is provided with a snap-connecting slot. The upper shell and the base are fixed by aligning the snap-connecting block with the snap-connecting slot and rotatingly connecting them. The base is provided with a wiring terminal, and the labyrinth seat is provided with a contact hole. The wiring terminal passes through the contact hole to contact the PCB board and is electrically connected.

[0019] Compared with the prior art, the utility model has at least the following beneficial effects:

[0020] The utility model optimizes and transforms the structure of the light emitting tube and the light receiving tube, and provides a standing part between the emitting end and the welding part, so that the light emitting tube and the light receiving tube can be placed flat on the surface of the PCB board through the standing part. Not only can the double tubes be welded to the PCB board by batch mounting on a mounting machine, but also the structure of the detector is simplified. There is no need to set up an additional photoelectric frame for installing the double tubes as in the prior art, and there is no need to set up an additional light guide column for changing the optical path as in the prior art, thereby improving the yield rate and production efficiency, and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the point-type smoke fire detector of this embodiment;

[0022] Figure 2 Schematic diagram of the split structure of the point-type smoke fire detector according to this embodiment;

[0023] Figure 3 Schematic diagram of the structure of the emitter tube of the point-type smoke fire detector according to this embodiment;

[0024] Figure 4 Schematic diagram of the structure of the upper shell of the point-type smoke fire detector according to this embodiment;

[0025] Figure 5 Schematic diagram of the structure of the maze cover of the point-type smoke fire detector according to this embodiment;

[0026] Figure 6 Schematic cross-sectional view of the point-type smoke fire detector according to this embodiment.

[0027] Explanation of the reference numerals in the drawings:

[0028] 1. Upper shell; 11. Smoke inlet; 12. Smoke guiding surface; 13. First partition; 2. Maze cover; 21. Insect-proof net; 22. Light-shielding cover; 23. Second partition; 3. PCB board; 4. Double tube; 41. Emitter end; 42. Standing part; 43. Welding part; 44. Auxiliary part; 5. Maze base; 51. Contact hole; 6. Base; 61. Wiring terminal. Detailed implementation manners

[0029] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific implementation manners.

[0030] This embodiment discloses a point-type smoke fire detector. Referring to Figure 1-6 , it includes a base 6 and an upper shell 1 that are buckled with each other. A maze is provided between the base 6 and the upper shell 1, and a PCB board 3 is arranged in the maze. The upper shell 1 is provided with a smoke inlet 11 communicating with the maze. The PCB board 3 is electrically connected with a light emitter and a light receiver (i.e., double tube 4). Both the light emitter and the light receiver include an emitter end 41 and a welding part 43. A standing part 42 that abuts against the PCB board 3 is provided between the emitter end 41 and the welding part 43. The angle between the ray of the emitter end 41 and the plane where the PCB board 3 is located is 0°. Of course, in other embodiments, it can also be 0 ± 10°.

[0031] By optimizing and transforming the structures of the optical emitter and the optical receiver, a standing portion 42 is provided between the emission end 41 and the welding portion 43, enabling the dual tube 4 (i.e., the optical emitter and the optical receiver) to be placed flat on the surface of the PCB board 3 through the standing portion 42, replacing the additional optical rack for placing the dual tube in the prior art. Moreover, since the direction of the emission end 41 of the dual tube is changed, there is no need to set a light guide column to change the optical path as in the prior art, and the maze can still meet the requirements of the detection area. In this way, on the one hand, the purpose of welding the dual tube 4 to the PCB board 3 in a batch by a pick-and-place machine can be achieved, thus improving the production output. On the other hand, the structure of the detector is simplified, the production cost is reduced, and the yield rate and production efficiency are improved.

[0032] In this embodiment, referring to Figure 3 , the standing portion 42 is a square block, and the emission end 41 and the welding portion 43 are respectively arranged on the two opposite transverse sides of the square block; the welding portion 43 is a pin, and the tail end of the pin far from the standing portion 42 is bent and extended to form an auxiliary portion 44. The bottom surface of the auxiliary portion 44 is flush with the bottom surface of the standing portion 42, and the auxiliary portion 44 is in contact welding with the PCB board 3 for electrical connection; the emission end 41 is a lamp bead, and the bottom end of the emission end 41 is flush with the bottom surface of the standing portion 42, and the emission end 41 is in contact with the PCB board 3. Through the above design of the structure of the dual tube 4, the contact surface between the standing portion 42 and the PCB board 3 is a relatively large square, enabling the dual tube 4 to be stably placed on the surface of the PCB board 3. In addition, the auxiliary portion 44 of the solder leg and the bottom end surface of the emission end 41 are both in contact with the PCB board 3, playing a role in assisting the stable placement. In addition, the emission end 41 is arranged on one side of the standing portion 42, which is beneficial to covering a shielding cover outside the optical receiver. See Figure 2 , the shielding cover can surround the optical receiver, only exposing the emission end 41. In this way, the anti-signal interference effect of the detector is better improved, and the detection accuracy of the smoke is improved.

[0033] In this embodiment, the maze includes a maze base 5 and a maze cover 2 installed on the maze base 5. The top surface of the maze cover 2 is provided with an insect-proof net 21. The upper shell 1 is provided with an inverted conical smoke guiding structure. The apex of the conical smoke guiding structure abuts against the middle of the insect-proof net 21. An inclined smoke guiding surface 12 is formed on one side of the conical smoke guiding structure facing the insect-proof net 21. The smoke inlet 11 is arranged on the outer periphery of the upper shell 1, and the smoke guiding surface 12 is arranged opposite to the smoke inlet 11, so that the smoke enters from the smoke inlet 11 and enters the lower maze as shown in Figure 6 . By providing a horizontally arranged insect-proof net 21 on the top surface of the maze cover 2, which is different from the vertically arranged insect-proof net in the prior art, not only the overall thickness of the detector is reduced, meeting the market demand for thinner fire detectors, but also, by providing a conical smoke guiding structure on the upper shell 1, a guiding and flowing effect on the smoke is achieved, and the smoke inlet effect is smoother. Thus, while reducing the thickness of the fire detector, the smoke detection reliability and sensitivity of the fire detector are ensured.

[0034] In this embodiment, a plurality of first partitions 13 are provided below the smoke guide surface 12, and the plurality of first partitions 13 separate the space enclosed by the inner top wall of the upper shell 1, the smoke guide surface 12 and the insect-proof net 21 to form a plurality of smoke inlet cavities, which are connected to the smoke inlet 11; a second partition 23 is provided below the bottom surface of the insect-proof net 21, and the plurality of second partitions 23 are connected one by one with the plurality of first partitions 13. By providing the first partitions 13 and the second partitions 23, a uniform smoke inlet effect is achieved from the smoke inlet 11 of the upper shell 1 to the interior of the maze, which not only makes the detector reliable in all directions of smoke detection without obvious azimuth differences, but also contributes to the convection effect of smoke, and can maintain the consistency of smoke concentration inside and outside the maze under different airflow environments, thereby improving the detection sensitivity.

[0035] In this embodiment, two light shields 22 are provided in the labyrinth cover 2, and the light emitting tube and the light receiving tube are placed in the two light shields 22 respectively, and a notch is provided on the light shield 22 for exposing the emitting end 41. By providing a cavity adapted to the double tube 4 in the labyrinth cover 2, on the one hand, it can be used as a light shield, so that the darkroom effect in the labyrinth is better, and on the other hand, the double tube 4 can be positioned and installed in the labyrinth, which improves the installation stability of the double tube 4, avoids the problem of looseness after long-term use caused by low welding strength, and improves the service life of the fire detector.

[0036] In this embodiment, the base 6 is provided with a terminal 61, and the labyrinth seat 5 is provided with a contact hole 51. The terminal 61 passes through the contact hole 51 and contacts the PCB board 3 to be electrically connected. The labyrinth seat 5 is snap-connected with the upper shell 1 to fix the labyrinth cover 2 and the PCB board 3 therein. The upper shell 1 is provided with a snap-connecting block, and the base 6 is provided with a snap-connecting slot. The upper shell 1 and the base 6 are fixed by aligning the snap-connecting block with the snap-connecting slot and rotating to connect. The terminal 61 rotates with the base 6 from abutting against the bottom wall of the labyrinth seat 5 to falling into the contact hole 51 and contacting the PCB board 3, so that the electrical contact assembly of the PCB board 3 and the terminal 61 is completed while the assembly of the base 6 and the upper shell 1 is completed, and the assembly efficiency is high and the connection is reliable.

[0037] In this embodiment, see Figure 6 A sinking detection area is provided in the maze, and the height difference between the plane where the transmitting end 41 is located and the plane where the bottom of the sinking detection area is located is 3 to 10 mm. By setting up the sinking detection area, the intersection point formed by the horizontal rays of the double-tube 4 transmitting end 41 is farther away from the bottom of the maze, thereby reducing reflection interference and widening the detection area in the maze, making the smoke detection result more accurate and faster.

[0038] The above has introduced in detail the technical solution provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A point-type smoke fire detector, comprising a base and an upper shell that are interlocked with each other, a maze and a PCB board arranged in the maze are arranged between the base and the upper shell, the upper shell is provided with a smoke inlet connected to the maze, and a light emitting tube and a light receiving tube are electrically connected to the PCB board, characterized in that: The light emitting tube and the light receiving tube both include an emitting end and a welding portion, a standing portion abutting against a PCB board is provided between the emitting end and the welding portion, and an angle between the ray of the emitting end and the plane where the PCB board is located is 0±10°.

2. The point type smoke fire detector according to claim 1, characterized in that: The standing portion is a block, and the emitting end and the welding portion are respectively arranged on two opposite lateral surfaces of the block.

3. The point type smoke fire detector according to claim 1, characterized in that: The welding part is a pin, and the tail end of the pin is bent and extended away from the standing part to form an auxiliary part. The bottom surface of the auxiliary part is flush with the bottom surface of the standing part, and the auxiliary part is in contact with the PCB board and is electrically connected.

4. The point type smoke fire detector according to claim 1, characterized in that: The bottom end of the transmitting end is flush with the bottom surface of the standing portion, and the transmitting end is in contact with the PCB board.

5. The point type smoke fire detector according to claim 1, characterized in that: A sinking detection area is provided in the maze, and the height difference between the plane where the transmitting end is located and the plane where the bottom of the sinking detection area is located is 3 to 10 mm.

6. The point type smoke fire detector according to claim 1, characterized in that: The maze includes a maze seat and a maze cover installed on the maze seat, the top surface of the maze cover is provided with an insect-proof net, the upper shell is provided with an inverted conical smoke-guiding structure, the cone top of the conical smoke-guiding structure abuts the middle part of the insect-proof net, and the conical smoke-guiding structure forms an inclined smoke-guiding surface on the side facing the insect-proof net, the smoke inlet is arranged on the outer periphery of the upper shell, the smoke guiding surface is arranged opposite to the smoke inlet, and the smoke enters from the smoke inlet and enters the maze along the smoke guiding surface.

7. The point-type smoke fire detector according to claim 6, characterized in that: Two light shields are arranged in the labyrinth cover, the light emitting tube and the light receiving tube are placed in the two light shields respectively, and a notch is arranged on the light shield for exposing the emitting end.

8. The point-type smoke fire detector according to claim 6, characterized in that: A plurality of first partitions are arranged at intervals below the smoke guide surface, and the plurality of first partitions separate the space surrounded by the inner top wall of the upper shell, the smoke guide surface and the insect-proof net into a plurality of smoke inlet cavities, and the smoke inlet cavities are connected to the smoke inlet port.

9. The point type smoke fire detector according to claim 8, characterized in that: The bottom surface of the insect-proof net is provided with second partitions at intervals, and a plurality of the second partitions are connected one by one with a plurality of the first partitions.

10. The point-type smoke fire detector according to claim 6, characterized in that: The labyrinth seat is connected with the upper shell by snapping, and the labyrinth cover and the PCB board are fixedly clamped therein; the upper shell is provided with a snap-in block, and the base is provided with a snap-in slot. The upper shell and the base are fixed by aligning the snap-in block with the snap-in slot and rotatingly connecting them. The base is provided with a wiring terminal, and the labyrinth seat is provided with a contact hole. The wiring terminal passes through the contact hole to contact the PCB board and is electrically connected.

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