Optical labyrinth smoke alarm convenient to assemble
By employing a combination of forward and backward emitting tubes and a snap-fit/twisting structure in the optical maze smoke detector, the problems of low detection accuracy and low production efficiency have been solved, achieving high-precision smoke recognition and simplified assembly, thus improving production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGSHAN GUANGWEI FIRE EQUIP TECH CO LTD
- Filing Date
- 2025-09-10
- Publication Date
- 2026-05-19
AI Technical Summary
Existing optical maze smoke detectors have low detection accuracy, making it difficult to distinguish between smoke and non-smoke particles. Furthermore, they are difficult to manufacture and assemble, resulting in low mass production efficiency.
An optical maze smoke alarm was designed, which uses a combination of forward and backward emitting tubes to increase the scattering angle, and simplifies the assembly process through a snap-fit and screw-on structure, including a snap-fit structure between the bracket and the top cover and a screw-on structure for the top cover.
It improves the accuracy and sensitivity of smoke detection, reduces false alarms and missed alarms, simplifies the production and assembly process, and improves the efficiency of mass production.
Smart Images
Figure CN224263686U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an alarm device, and more particularly to a smoke alarm. Background Technology
[0002] Optical labyrinth smoke detectors detect smoke in the environment to trigger fire alarms. In existing technology, typical optical labyrinth smoke detectors employ a forward-scattering structure combining a single transmitter and a single receiver. When smoke particles enter the labyrinth cavity, the detection beam emitted by the transmitter interacts with the smoke particles, causing forward scattering, which in turn triggers photoelectric conversion in the receiver to acquire the signal. However, the detection accuracy of a single scattering angle is low, and it cannot effectively distinguish between smoke and non-smoke particles, easily leading to false alarms or missed alarms. Furthermore, existing optical labyrinth smoke detectors are difficult to manufacture and assemble, resulting in low mass production efficiency. Utility Model Content
[0003] To overcome the shortcomings of the existing technology, this utility model provides an optical maze smoke alarm that is easy to assemble and effectively identifies smoke and non-smoke particles.
[0004] The technical solution adopted by this utility model to solve its technical problem is:
[0005] An easily assembled optical labyrinth smoke detector includes a base, a bracket mounted on the base, a top cover mounted on the bracket, a labyrinth cavity between the bracket and the top cover, and several smoke inlets on the outer wall of the top cover. The base is provided with a forward emitting tube holder, a backward emitting tube holder, and a receiving tube holder, each containing a forward emitting tube, a backward emitting tube, and a receiving tube, respectively. The bottom of the labyrinth cavity has forward scattering holes, backward scattering holes, and receiving holes for exposing the forward emitting tube, backward emitting tube, and receiving tube. The bracket is mounted on the base via a snap-fit structure, and the top cover is mounted on the bracket via a screw-on structure.
[0006] As a further improvement of this utility model, the included angle between the forward transmitting tube socket and the receiving tube socket is an obtuse angle.
[0007] As a further improvement of this utility model, the included angle between the rearward transmitting tube socket and the receiving tube socket is an acute angle.
[0008] As a further improvement of this utility model, the upper end of the bracket is provided with a tubular part, and the inner side of the top of the cover is provided with a plurality of labyrinth walls arranged circumferentially. After assembly, the lower end of the labyrinth wall extends into the tubular part to form the labyrinth cavity.
[0009] As a further improvement of this utility model, the inner sidewall of the tubular part is provided with several grooves in the circumferential direction.
[0010] As a further improvement of this utility model, the top inner side of the top cover is provided with a plurality of arranged V-shaped stripes.
[0011] As a further improvement of this utility model, the lower end of the bracket is provided with a plurality of downwardly extending buckle arms, and the end of the buckle arm is provided with an outwardly protruding buckle hook. The base includes an annular seat. After assembly, the buckle arms extend into the annular seat, and the buckle hook is located directly below the annular seat.
[0012] As a further improvement of this utility model, the inner sidewall of the annular seat is provided with an annular step, and the lower end of the bracket is provided with a plurality of support parts in the circumferential direction. After assembly, the bottom of the support parts abuts against the annular step.
[0013] As a further improvement of this utility model, the lower end of the upper cover is symmetrically provided with a connecting part that protrudes laterally outward, and the upper end of the bracket is symmetrically provided with a plug-in seat. The plug-in seat is provided with a connecting port that is open at one end and not closed on the inside. During assembly, the lower end of the upper cover abuts against the upper end of the bracket, and the connecting part rotates and slides laterally into the connecting port.
[0014] As a further improvement of this utility model, an insect-proof net is provided on the outer periphery of the top cover.
[0015] The beneficial effects of this utility model are as follows: The base of this utility model is provided with a forward transmitting tube seat, a backward transmitting tube seat, and a receiving tube seat. A forward transmitting tube, a backward transmitting tube, and a receiving tube are respectively installed in the forward transmitting tube seat, the backward transmitting tube seat, and the receiving tube seat. The bottom of the labyrinth cavity is provided with a forward scattering hole, a backward scattering hole, and a receiving hole for exposing the forward transmitting tube, the backward transmitting tube, and the receiving tube. The two transmitting tubes generate forward scattering signals and backward scattering signals respectively to increase the scattering angle, thereby improving the detection accuracy of the alarm.
[0016] In addition, the bracket of this utility model is installed on the base through a snap-fit structure, and the top cover is installed on the bracket through a screw-on structure. The overall assembly structure is simple and convenient, thereby improving production efficiency. Attached Figure Description
[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0018] Figure 1 This is a schematic diagram of the structure of this utility model.
[0019] Figure 2 This is a partial exploded view of the structure of this utility model.
[0020] Figure 3 This is a schematic diagram of the support structure.
[0021] Figure 4 This is a structural diagram of the base.
[0022] Figure 5 This is a structural diagram of the top cover (reverse side facing up).
[0023] Figure 6 This is a structural cross-sectional view of the present invention.
[0024] Figure 7 This is an exploded view of the top cover.
[0025] Figure 8 This is an exploded view of the part of the present invention installed on the circuit board. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.
[0027] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.
[0028] The following describes some embodiments of the present invention with reference to the accompanying drawings.
[0029] Reference Figures 1 to 8 An easily assembled optical labyrinth smoke detector includes a base 1, a bracket 2 mounted on the base 1, a top cover 3 mounted on the bracket 2, a labyrinth cavity 21 between the bracket 2 and the top cover 3, and several smoke inlets 34 on the outer side wall of the top cover 3. The base 1 is provided with a forward emitting tube seat 11, a backward emitting tube seat 12, and a receiving tube seat 13. A forward emitting tube 14, a backward emitting tube 15, and a receiving tube 16 are respectively installed inside the forward emitting tube seat 11, the backward emitting tube seat 12, and the receiving tube seat 13. The bottom of the labyrinth cavity 21 is provided with a forward scattering hole 22, a backward scattering hole 23, and a receiving hole 24 for exposing the forward emitting tube 14, the backward emitting tube 15, and the receiving tube 16. The bracket 2 is mounted on the base 1 via a snap-fit structure, and the top cover 3 is mounted on the bracket 2 via a screw-on structure.
[0030] In this embodiment, the angle α between the forward emitting tube 11 and the receiving tube 13 is greater than 90 degrees, which is an obtuse angle, and the scattered signal is a forward scattered signal; the angle b between the backward emitting tube 12 and the receiving tube 13 is less than 90 degrees, which is an acute angle, and the scattered signal is a backward scattered signal. The two emitting tubes alternately generate scattered signals to increase the scattering angle. When smoke enters the labyrinth cavity, the forward scattered signal and the backward scattered signal detect each other. Then, the smoke particle size is collected by the forward emitting tube 14, the backward emitting tube 15, and the receiving tube 16 to distinguish between fire and non-fire particles, which greatly improves the response sensitivity of the sensor and thus improves the detection accuracy of the alarm.
[0031] In this embodiment, the forward scattering aperture 22 and the backward scattering aperture 23 are set to be inclined and elliptical in shape, which has a light-gathering effect and can effectively increase the signal amount at the receiving end, thereby improving the accuracy of detection.
[0032] The upper end of the bracket 2 is provided with an upwardly extending tubular part 25, and the top inner side of the top cover 3 is provided with several circumferentially spaced V-shaped maze walls 31. After assembly, the lower end of the maze wall 31 extends into the tubular part 25 to form the maze cavity 21. The light in the maze cavity 21 is refracted multiple times to improve the accuracy of detection.
[0033] The inner wall of the tubular portion 25 is provided with a plurality of vertical grooves 26 arranged circumferentially. The top inner side of the upper cover 3 is provided with a plurality of V-shaped stripes 32 arranged in a plurality of rows. In this embodiment, the plurality of grooves 26 can effectively reduce the background light inside the labyrinth cavity 21, and the plurality of stripes 32 can also eliminate the background light and, at the same time, serve as guide grooves, allowing external smoke to quickly enter the labyrinth cavity 21, reducing the alarm response time.
[0034] The bracket 2 of this utility model is installed on the base 1 through a snap-fit structure. Specifically, the lower end of the bracket 2 is provided with several downwardly extending snap-fit arms 27, and the end of each snap-fit arm 27 is provided with an outwardly protruding snap-fit hook 28. The base 1 includes an annular seat 17. After assembly, the snap-fit arms 27 extend into the annular seat 17, and the snap-fit hooks 28 are located directly below the annular seat 17. The assembly structure is simple. In this embodiment, the inner sidewall of the annular seat 17 is provided with an annular step 18, and the lower end of the bracket 2 is provided with several support parts 29. After assembly, the bottom of the support parts 29 abuts against the annular step 18 to prevent the bracket 2 from snapping down too much, facilitating assembly.
[0035] The upper cover 3 of this utility model is installed on the bracket 2 by a screw fastener structure. Specifically, the lower end of the upper cover 3 is symmetrically provided with a connecting part 33 that protrudes laterally outward, and the upper end of the bracket 2 is symmetrically provided with a plug seat 210. The plug seat 210 is provided with a connecting port 211 that is open at one end and not closed on the inside. During assembly, the lower end of the upper cover 3 abuts against the upper end of the bracket 2, and the connecting part 33 rotates and slides laterally into the connecting port 211. The assembly structure is simple.
[0036] In this embodiment, the top of the connecting part 33 is provided with a snap-fit part, and the top of the connecting port 211 is provided with a snap-fit groove that is adapted to the shape of the snap-fit part. After assembly, the connecting part 33 rotates and slides laterally into the connecting port 211, and the snap-fit part snaps into the snap-fit groove, so that the upper cover 3 and the bracket 2 are stably connected.
[0037] The outer wall of the upper cover 3 is provided with an insect-proof net 35. Specifically, it can adopt a set assembly structure for easy assembly. In addition, the insect-proof net 35 can effectively prevent flying insects from entering the maze cavity and causing false alarms.
[0038] In this invention, the lower end of the base 1 is mounted on the circuit board 4. The lower end of the base 1 is provided with several positioning posts 19. The circuit board 4 is provided with positioning holes 41 corresponding to the positioning posts 19. After assembly, the positioning posts 19 extend into the positioning holes 41 for easy assembly. Additionally, the circuit board 4 is provided with snap-fit holes 42 corresponding to the snap-fit arm 27. After the bracket 2 is mounted on the base 1, the snap-fit arm 27 extends further downward into the snap-fit hole 42, and then the snap-fit hook 28 snaps onto the bottom of the circuit board 4. The assembly structure is simple.
[0039] In this invention, the term "multiple" refers to two or more items unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0040] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0041] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.
Claims
1. A conveniently assembled optical labyrinth smoke alarm comprising a base (1) characterised in that The base (1) is provided with a support (2), the support (2) is provided with an upper cover (3), a labyrinth cavity (21) is arranged between the support (2) and the upper cover (3), a plurality of smoke inlet holes (34) are arranged on the outer side wall of the upper cover (3), the base (1) is provided with a front emission tube seat (11), a rear emission tube seat (12) and a receiving tube seat (13), the front emission tube seat (11), the rear emission tube seat (12) and the receiving tube seat (13) are respectively provided with a front emission tube (14), a rear emission tube (15) and a receiving tube (16), the bottom of the labyrinth cavity (21) is respectively provided with a front scattering hole (22), a rear scattering hole (23) and a receiving hole (24) for exposing the front emission tube (14), the rear emission tube (15) and the receiving tube (16), the support (2) is installed on the base (1) through a clamping structure, and the upper cover (3) is installed on the support (2) through a rotating buckle structure.
2. The convenience assembled optical labyrinth smoke alarm of claim 1, wherein The included angle between the front emission tube seat (11) and the receiving tube seat (13) is obtuse.
3. The convenience assembled optical labyrinth smoke alarm of claim 1 wherein The included angle between the rear emission tube seat (12) and the receiving tube seat (13) is acute.
4. The convenience assembled optical labyrinth smoke alarm of claim 1 wherein The upper end of the support (2) is provided with a tubular part (25), the inner side of the top of the upper cover (3) is provided with a plurality of labyrinth walls (31) arranged in a circumferential direction, after assembly, the lower end of the labyrinth wall (31) extends into the tubular part (25), and the labyrinth cavity (21) is formed.
5. The convenience assembled optical labyrinth smoke alarm of claim 4 wherein The inner side wall of the tubular part (25) is circumferentially provided with a plurality of grooves (26).
6. The convenience assembled optical labyrinth smoke alarm of claim 4 wherein The inner side of the top of the upper cover (3) is provided with a plurality of V-shaped stripe parts (32) arranged in a circumferential direction.
7. The convenience assembled optical labyrinth smoke alarm of claim 1, wherein The lower end of the support (2) is provided with a plurality of clamping arms (27) extending vertically downward, the distal end of the clamping arm (27) is provided with a clamping hook (28) protruding outward, and the base (1) comprises a ring-shaped seat (17), after assembly, the clamping arm (27) extends into the ring-shaped seat (17), and the clamping hook (28) is located directly below the ring-shaped seat (17).
8. The convenience assembled optical labyrinth smoke alarm of claim 7, wherein The inner side wall of the ring-shaped seat (17) is provided with a ring-shaped step (18), and the lower end of the support (2) is circumferentially provided with a plurality of supporting parts (29), after assembly, the bottom of the supporting part (29) abuts against the ring-shaped step (18).
9. The convenience assembled optical labyrinth smoke alarm of claim 1 wherein The lower end of the upper cover (3) is symmetrically provided with a connecting part (33) protruding outward in a transverse direction, the upper end of the support (2) is symmetrically provided with a plug-in seat (210), the plug-in seat (210) is provided with a connecting port (211) with one end open and the inner side not closed, and during assembly, the lower end of the upper cover (3) abuts against the upper end of the support (2), and the connecting part (33) is rotated and transversely slid into the connecting port (211).
10. The convenience assembled optical labyrinth smoke alarm of claim 1, wherein The outer periphery of the upper cover (3) is provided with an insect-proof net (35).