CN221993982U

CN221993982U - Smoke alarm

Info

Publication number: CN221993982U
Application number: CN202420275208.3U
Authority: CN
Inventors: 姚忠新; 孟进; 李志�
Original assignee: Guangdong Xidun Intelligent Fire Equipment Co ltd
Current assignee: Guangdong Xidun Intelligent Fire Equipment Co ltd
Filing date: 2024-02-04
Publication date: 2024-11-12
Anticipated expiration: 2034-02-04

Abstract

The utility model provides a smoke alarm comprising: the device comprises a shell, a substrate, an inner cover, a main control board, a light emitting unit and a light detecting unit; the inner cover is arranged on the base plate, is matched with the base plate to clamp the main control board, is provided with a plurality of through holes, and surrounds the base plate together to form a darkroom, and is internally provided with a light reflection structure; the light emitting unit and the light detecting unit are arranged on the main control board, and the light emitting unit and the light detecting unit are arranged in the dark room. Compared with the prior art, in the smoke alarm, the light emitting unit and the light detecting unit can be welded on the main control board in advance, the main control board is limited by clamping the inner cover and the base plate, the darkroom is also formed between the inner cover and the base plate, and when the main control board is clamped by the inner cover and the base plate, the light emitting unit and the light detecting unit just smoothly extend into the darkroom, so that the smoke alarm is simple to install and convenient to operate, and the production efficiency is improved.

Description

Smoke alarm

Technical Field

The utility model relates to the technical field of security protection, in particular to a smoke alarm.

Background

According to the existing fire safety regulations, a smoke alarm system is a necessary infrastructure fire protection facility for a building. The smoke alarm system can effectively prevent fire from occurring and spreading, and plays an important role in protecting life and property safety of people. Common smoke alarm systems typically include smoke alarms located at various monitoring locations within a building and a control terminal located at a control center. The control end realizes signal connection among the smoke alarms through pipelines, so that the alarms are controlled to realize fire alarm according to sensing signals obtained from the smoke alarms.

There are various principles of smoke alarms, for example, ionic smoke alarms have radioactive substances capable of generating an electric current, and when smoke particles in smoke enter a sensor, the electric current is disturbed, thereby causing the alarm to sound an alarm. The principle of photoelectric smoke alarm adopts and sets up an inner shell in the casing, and the inside darkroom that forms of inner shell sets up light reflection structure in the darkroom for the light beam that the transmitter sent reflects, makes the light beam unable to be caught by the receiver, when indoor smoke particle that exists, the light beam can be caught by the receiver under the influence of reflection, the refraction of smoke particle, then the alarm sends the alarm sound.

In the current photoelectric smoke alarm, as the circuit board is arranged on the outer side of the inner shell, the transmitter and the receiver are required to be arranged in the darkroom of the inner shell, so that the transmitter and the receiver are required to pass through the inner shell and then be welded on the circuit board, the welding operation is difficult, and the production efficiency is low.

Disclosure of utility model

The utility model aims to overcome the defects and shortcomings in the prior art and provides a smoke alarm.

One embodiment of the present utility model provides a smoke alarm comprising: the device comprises a shell, a substrate, an inner cover, a main control board, a light emitting unit and a light detecting unit;

The base plate, the inner cover, the main control board, the light emitting unit and the light detecting unit are arranged in the shell;

The inner cover is arranged on the base plate, is matched with the base plate to clamp the main control board, is provided with a plurality of through holes, and surrounds the base plate together to form a darkroom, and is internally provided with a light reflection structure, and the through holes are communicated with the darkroom;

The light emitting unit and the light detecting unit are arranged on the main control board and are electrically connected with the main control board, and the light emitting unit and the light detecting unit are arranged in the dark room.

In some optional embodiments, a first positioning groove is formed in the substrate, the main control board is matched with the first positioning groove in a positioning way, and the inner cover presses the main control board in the first positioning groove.

In some optional embodiments, a first positioning part is arranged in the first positioning groove, and a side positioning groove matched with the first positioning part in a positioning way is arranged on the side surface of the main control board.

In some alternative embodiments, the base plate is detachably connected to the housing, and when the base plate is connected to the housing, the base plate presses the inner cover against the inner wall of the housing to limit the position of the inner cover.

In some optional embodiments, a plurality of buckling parts are arranged on the substrate, the buckling parts are uniformly arranged around the substrate, a plurality of buckling grooves are arranged on the shell, and the buckling parts are correspondingly buckled and matched with the buckling grooves.

In some alternative embodiments, a second positioning part is arranged on the inner wall of the outer shell, a second positioning groove is arranged on the inner cover, and the second positioning part is matched with the second positioning groove in a positioning way.

In some optional embodiments, two light shielding chambers are disposed in the darkroom, a light passing hole is disposed on one side of the light shielding chamber, and the light emitting unit and the light detecting unit are correspondingly disposed in the two light shielding chambers.

In some alternative embodiments, two light shielding grooves are arranged on the inner cover, and the light shielding grooves, the main control board and/or the base plate surround to form the light shielding chamber.

In some alternative embodiments, a protruding light shielding plate is arranged on the substrate, and the light shielding plate is clamped into the light shielding groove and surrounds the light transmitting hole with the light shielding groove.

In some alternative embodiments, the light reflecting structure includes an intermediate light blocking plate disposed between the light emitting unit and the light detecting unit, and a plurality of reflecting plates disposed at an inner wall of the dark room and arranged in order in a direction from the light emitting unit to the light detecting unit, the light emitting unit and the light detecting unit being directed toward the reflecting plate.

Compared with the prior art, in the smoke alarm, the light emitting unit and the light detecting unit can be welded on the main control board in advance, the main control board is limited by clamping the inner cover and the base plate, the darkroom is also formed between the inner cover and the base plate, and when the main control board is clamped by the inner cover and the base plate, the light emitting unit and the light detecting unit just smoothly extend into the darkroom, so that the smoke alarm is simple to install and convenient to operate, and the production efficiency is improved.

In order that the utility model may be more clearly understood, specific embodiments thereof will be described below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of a smoke alarm according to one embodiment of the utility model;

FIG. 2 is a schematic diagram of a substrate and a main control board according to an embodiment of the present utility model;

FIG. 3 is an exploded view of a portion of the structure of the housing, the base plate, the inner cover and the main control panel according to one embodiment of the present utility model;

Fig. 4 is a cross-sectional view of a base plate, an inner cover, and a main control board according to an embodiment of the present utility model.

Reference numerals illustrate:

10. A housing; 11. a buckling groove; 12. a second positioning portion; 20. a substrate; 21. a first positioning groove; 22. a first positioning portion; 23. a fastening part; 24. a light shielding plate; 30. an inner cover; 31. a through hole; 32. a darkroom; 33. a light reflecting structure; 331. a middle light barrier; 332. a reflection plate; 34. a second positioning groove; 35. a light-transmitting hole; 36. a light shielding groove; 40. a main control board; 41. a side positioning groove; 50. a light emitting unit; 60. and a light detection unit.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "plurality" is 2 or more, and the meaning of "several" is 1 or more. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated unless otherwise indicated.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, reference to the terms "one embodiment," "some alternative implementations," or "some alternative embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1 to 3, an embodiment of the present utility model provides a smoke alarm including: the device comprises a housing 10, a base plate 20, an inner cover 30, a main control board 40, a light emitting unit 50 and a light detecting unit 60.

Referring to fig. 4, the substrate 20, the inner cover 30, the main control board 40, the light emitting unit 50 and the light detecting unit 60 are disposed in the housing 10; the inner cover 30 is arranged on the base plate 20 and is matched with the base plate 20 to clamp the main control board 40, a plurality of through holes 31 are formed in the inner cover 30, the inner cover 30 and the base plate 20 jointly surround to form a darkroom 32, a light reflection structure 33 is arranged in the darkroom 32, and the through holes 31 are communicated with the darkroom 32; the light emitting unit 50 and the light detecting unit 60 are disposed on the main control board 40 and electrically connected with the main control board 40, and the light emitting unit 50 and the light detecting unit 60 are disposed in the darkroom 32. The light emitting unit 50 and the light detecting unit 60 may be welded on the main control board 40 in advance, then placed on the substrate 20, and the main control board 40 is clamped and limited by the inner cover 30 and the substrate 20, and the darkroom 32 is also formed between the inner cover 30 and the substrate 20, and when the main control board 40 is clamped by the inner cover 30 and the substrate 20, the light emitting unit 50 and the light detecting unit 60 just smoothly extend into the darkroom 32, so that the installation is simple, the operation is convenient, and the production efficiency is improved.

The detection light beam emitted by the light emitting unit 50 is emitted to the light reflecting structure 33, the detection light beam cannot be emitted to the light detecting unit 60 through the light reflecting structure 33, smoke can enter the darkroom 32 through the through hole 31, after the smoke enters the darkroom 32, part of the detection light beam is emitted to the light detecting unit 60 under the influence of reflection/refraction of the smoke, after the detection light beam is captured by the light detecting unit 60, a detection signal is generated and sent to the main control board 40, the main control board 40 can send the detection signal to an alarm or a fire protection system, the alarm sends an alarm signal, and the alarm signal can be an optical signal or a sound signal.

In some alternative embodiments, the substrate 20 is provided with a first positioning slot 21, and the main control board 40 is matched with the first positioning slot 21 in a positioning way, so that the position deviation of the main control board 40 is avoided, and the inner cover 30 presses the main control board 40 in the first positioning slot 21, so that the main control board 40 is limited.

In some alternative embodiments, the first positioning portion 22 is disposed in the first positioning groove 21, and the side surface of the main control board 40 is disposed with a side positioning groove 41 that is in positioning fit with the first positioning portion 22, so as to avoid the main control board 40 from shaking in the first positioning groove 21.

In some alternative embodiments, the base plate 20 is detachably connected to the housing 10, when the base plate 20 is connected to the housing 10, the base plate 20 presses the inner cover 30 against the inner wall of the housing 10 to limit the position of the inner cover 30, and when the base plate 20 presses the inner cover 30 against the inner wall of the housing 10, the main control board 40 can be further pressed onto the inner cover 30, so that the inner cover 30 and the base plate 20 cooperate to clamp the main control board 40.

In some optional embodiments, a plurality of buckling parts 23 are arranged on the substrate 20, the plurality of buckling parts 23 are uniformly arranged around the substrate 20, a plurality of buckling grooves 11 are arranged on the shell 10, the buckling parts 23 are correspondingly in buckling fit with the buckling grooves 11, so that the substrate 20, the inner cover 30, the shell 10 and the main control board 40 are mutually fixed without using screws and other structures, the substrate 20 can be fixed with the substrate 20, the inner cover 30, the shell 10 and the main control board 40 only through the buckling structures, the structure is simplified, the production is convenient, and the production efficiency is improved.

In some alternative embodiments, the inner wall of the outer shell 10 is provided with the second positioning part 12, the inner cover 30 is provided with the second positioning groove 34, and the second positioning part 12 is matched with the second positioning groove 34 in a positioning way, so that the position offset between the inner cover 30 and the outer shell 10 is avoided, and the structural stability is improved.

In some alternative embodiments, two light shielding chambers are provided in the darkroom 32, one side of the light shielding chamber is provided with the light passing hole 35, and the light emitting unit 50 and the light detecting unit 60 are correspondingly arranged in the two light shielding chambers. Light can only enter the shading chamber through the light through holes 35, so that the influence of disordered ambient light on the light emitting unit 50 and the light detecting unit 60 can be avoided, and the precision is improved.

To facilitate the formation of the light shielding chamber, in some alternative embodiments, two light shielding grooves 36 are provided on the inner cover 30, the light shielding grooves 36 and the main control board 40 and/or the substrate 20 form the light shielding chamber around, when the inner cover 30 is pressed on the substrate 20, the main control board 40 is also pressed on the substrate 20, and the light shielding grooves 36 on the inner cover 30 are correspondingly covered on the outer sides of the light emitting unit 50 and the light detecting unit 60.

In some alternative embodiments, the substrate 20 is provided with a protruding light shielding plate 24, the light shielding plate 24 is clamped into the light shielding groove 36 and surrounds the light shielding groove 36 to form a light through hole 35, the light shielding plate 24 and the light shielding groove 36 together limit the light through hole 35, so that the formation of the light through hole 35 is facilitated, and the light shielding plate 24 limits the position of the inner cover 30 relative to the substrate 20 through being clamped with the light shielding groove 36, so that the structural stability is improved.

In some alternative embodiments, the light reflecting structure 33 includes an intermediate light blocking plate 331 and a plurality of reflecting plates 332, the intermediate light blocking plate 331 is disposed between the light emitting unit 50 and the light detecting unit 60, the plurality of reflecting plates 332 are disposed at the inner wall of the darkroom 32 and are sequentially arranged in a direction from the light emitting unit 50 to the light detecting unit 60, the light emitting unit 50 and the light detecting unit 60 are directed toward the reflecting plates 332, the light emitting unit 50 emits light beams toward any one or more of the reflecting plates 332, the light beams are not directed toward the light detecting unit 60 after being reflected by the respective reflecting plates 332, and the intermediate light blocking plate 331 can prevent the light beams of the light emitting unit 50 from being directed toward the light detecting unit 60.

The specific structures of the light emitting unit 50 and the light detecting unit 60 may be designed according to actual needs, for example, the light emitting unit 50 is an infrared emitter, and the light detecting unit 60 is an infrared receiver.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A smoke alarm, comprising: the device comprises a shell, a substrate, an inner cover, a main control board, a light emitting unit and a light detecting unit;

2. A smoke alarm according to claim 1 wherein: the base plate is provided with a first positioning groove, the main control board is matched with the first positioning groove in a positioning way, and the inner cover presses the main control board in the first positioning groove.

3. A smoke alarm according to claim 2 wherein: the main control board is characterized in that a first positioning part is arranged in the first positioning groove, and a side positioning groove matched with the first positioning part in a positioning way is arranged on the side face of the main control board.

4. A smoke alarm according to claim 1 wherein: the base plate is detachably connected with the shell, and when the base plate is connected with the shell, the base plate presses the inner cover to the inner wall of the shell so as to limit the position of the inner cover.

5. A smoke alarm as claimed in claim 4 wherein: the base plate is provided with a plurality of buckling parts, a plurality of buckling parts are uniformly arranged around the base plate, the shell is provided with a plurality of buckling grooves, and the buckling parts are correspondingly buckled and matched with the buckling grooves.

6. A smoke alarm as claimed in claim 4 wherein: the inner wall of the shell is provided with a second positioning part, the inner cover is provided with a second positioning groove, and the second positioning part is matched with the second positioning groove in a positioning way.

7. A smoke alarm according to any one of claims 1 to 6 wherein: two shading chambers are arranged in the darkroom, one side of each shading chamber is provided with a light passing hole, and the light emitting unit and the light detecting unit are correspondingly arranged in the two shading chambers.

8. A smoke alarm as claimed in claim 7 wherein: two shading grooves are formed in the inner cover, and the shading grooves, the main control board and/or the base plate surround to form the shading chamber.

9. A smoke alarm according to claim 8 wherein: the substrate is provided with a convex light shielding plate, and the light shielding plate is clamped into the light shielding groove and surrounds the light shielding groove to form the light through hole.

10. A smoke alarm according to any one of claims 1 to 6 wherein: the light reflecting structure comprises an intermediate light barrier and a plurality of reflecting plates, wherein the intermediate light barrier is arranged between the light emitting unit and the light detecting unit, the reflecting plates are arranged on the inner wall of the darkroom and are sequentially arranged in the direction from the light emitting unit to the light detecting unit, and the light emitting unit and the light detecting unit face the reflecting plates.