Independent smoke alarm

Abstract

The utility model relates to an independent smoke-sensing alarm, which comprises a protective shell detachably and tightly buckled at the bottom of a fixed bottom plate, a smoke labyrinth ring arranged at the peripheries of a smoke sensor, a temperature sensor and a light-sensing probe, and a circuit board arranged at the bottom of an electronic circuit board, circuit contact pins of the smoke sensor, the temperature sensor and the light sensing probe extend downwards to be tightly inserted into a circuit board, the smoke alarm is an independent smoke alarm, a communication card slot is added, a mobile communication card can be conveniently installed before use, the smoke alarm can be networked with a fire platform, the fire detection condition can be conveniently checked, and alarm can be conveniently carried out; the fire alarm is provided with a plurality of different sensors for judging whether fire occurs or not, misjudgment is effectively reduced, interference of particulate matter and light is isolated through the smoke maze with a good isolation effect, and the judgment accuracy is further improved. According to the utility model, the structure is greatly optimized, the installation is very convenient, and the problem that part of components on the circuit board cannot be automatically welded on a production line in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke alarms, in particular to an independent smoke detector alarm. Background Art

[0002] In traditional technical applications, smoke detectors or smoke sensors are generally designed into three parts: a detector housing, an electronic circuit board, and a smoke maze structure. In this traditional and common technical application, a single independent smoke alarm can actually only give prompts and beeps. Currently, there are already many independent smoke alarms, mainly using sound warning as the main means, and basically only one smoke sensor is used for detection.

[0003] Currently, there are some independent smoke alarms, but their installation structures are very difficult to disassemble and assemble. Moreover, the mobile communication card is installed inside, making it inconvenient to install the mobile communication card. The installation operation is not convenient. At the same time, for the current smoke detectors of the same type, when manufacturing, the connection wires between the circuit board and the detection sensor are very complex, and the connection method is inconvenient. It is necessary to connect circuits on both sides of the circuit board for welding, so automated production on the production line cannot be carried out, and the assembly is difficult.

[0004] Based on this, the utility model designs an independent smoke detector alarm to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an independent smoke detector alarm, which can be an independent smoke alarm without any network and wires. It is equipped with a communication card slot, which is convenient for installing a mobile communication card before use. It can be connected to a fire situation platform without external wiring, facilitating the viewing of fire detection situations and also facilitating alarm. Moreover, it has a variety of sensors for judging whether a fire has occurred, effectively reducing false alarms. At the same time, a smoke maze with good isolation effect is used to isolate the interference of particulate matter and light, further improving the accuracy of judgment.

[0006] The utility model is implemented as follows: An independent smoke detector alarm includes:

[0007] A protective shell, an electronic circuit board, a maze cover, a smoke maze, and a fixed bottom plate;

[0008] The protective shell is a hollow housing, which is a closed housing with an open top. A smoke channel is also annularly provided on the side wall of the protective shell. The smoke channel is a fence-shaped through hole penetrating the side wall of the protective shell. A light guide column is also provided at the bottom of the protective shell. The light guide column is a transparent columnar structure. The inner end of the light guide column extends into the interior of the protective shell and also serves as a mute button;

[0009] The smoke maze is a circular maze passage. A positioning plate is provided at the bottom of the smoke maze. Smoke sensors, temperature sensors, and light sensors are also provided on the top of the positioning plate. The smoke maze is arranged around the smoke sensors, temperature sensors, and light sensors;

[0010] The electronic circuit board is a flat circuit board, which can be detachably installed at the bottom of the smoke maze; A communication card slot and a buzzer are also embedded on the bottom surface of the electronic circuit board;

[0011] The fixed bottom plate is a flat plate; The maze cover is a frustum-shaped base. An annular insect-proof net is provided at the bottom of the maze cover. The maze cover can be detachably locked to the bottom of the fixed bottom plate. The protective shell and the maze cover can be detachably buckled to form a complete cavity; The electronic circuit board, the positioning plate, and the smoke maze are all located in the cavity formed by the protective shell and the maze cover;

[0012] The smoke maze can be detachably and stably buckled inside the insect-proof net; A battery is provided at the top of the maze cover. The positive and negative electrodes of the battery are connected with pins. The connectors of the smoke sensors, temperature sensors, and light sensors are also provided with pins. Each of the pins extends below the positioning plate;

[0013] Each of the pins is plugged into the socket of the electronic circuit board.

[0014] Further, the protective shell does not contact the electronic circuit board;

[0015] A card cover is also provided at the bottom of the electronic circuit board. The card cover is a flip cover, which can be opened and installed at the bottom of the protective shell. The communication card slot is opposite to the opening of the card cover; The communication card slot is located inside the card cover;

[0016] The buzzer is also within the protection range of the card cover.

[0017] Further, a plurality of buckle grooves are provided on the side wall of the maze cover, and a plurality of buckles are also provided on the inner wall of the top opening of the protective shell. The positions and numbers of the plurality of buckle grooves and the plurality of buckles correspond one by one. The buckle grooves and the buckles can be detachably buckled;

[0018] The protective shell can be detachably locked to the bottom of the maze cover through the buckle grooves and the buckles.

[0019] Further, each of the pins can be detachably connected to the circuit board of the electronic circuit board through a wiring terminal;

[0020] The buzzer can be detachably inserted into the circuit at the bottom of the electronic circuit board. The buzzer is connected to the battery through the wiring terminal on the electronic circuit board.

[0021] Furthermore, a plug-in slot and a plurality of limiting buckles are also arranged at the bottom of the positioning plate; the plug-in slot is a groove protruding upward;

[0022] A pre-installed positioning seat also protrudes upward from the top of the electronic circuit board; the pre-installed positioning seat can be detachably and tightly inserted into the plug-in slot, and there is an interference fit between the pre-installed positioning seat and the plug-in slot;

[0023] The electronic circuit board can be detachably installed at the bottom of the smoke maze through the pre-installed positioning seat and the plug-in slot;

[0024] The limiting buckle is a PVC elastic hook, and a plurality of the limiting buckles can be elastically and detachably hooked on the edge of the electronic circuit board.

[0025] Furthermore, the battery includes an alkaline battery and a lithium battery.

[0026] The beneficial effects of the present utility model are as follows: 1. The protective shell of the present device can be disassembled and assembled with the fixed bottom plate, which is convenient for installation and adjustment, more convenient to use, provides convenience for later replacement of components or batteries, and the installation method is simple. It only needs to fix the fixed bottom plate indoors through glue or bolts to complete the installation;

[0027] 2. The fixed bottom plate, electronic circuit board and maze cover of the present device are arranged in a compact structure. Moreover, the chip and the easily damaged circuit board are designed on the outside, and the pins also protrude outside, making installation and assembly more convenient, and the connection operation between the circuit board and the pins is also more convenient. In addition, the fixed bottom plate, the internal battery and the circuit board of the present device are modular, can be disassembled and assembled conveniently, are more convenient to use, and the replacement of components is also more convenient;

[0028] 3. The protective shell of the present device is locked through the positioning block and the buckle groove, which is convenient to open. Moreover, a card cover is also provided, which can conveniently install a mobile communication card, has more usage scenarios, no longer requires pre-connection of lines, nor does the building need to have communication lines and circuits. The present device can complete signal transmission and power supply by itself, is basically not restricted by the environment during use, can not only directly give a beeping warning for warning information, but also can automatically alarm in time and transmit the detection data to the platform for manual judgment of the fire situation;

[0029] 4. The present device is also provided with a smoke maze, and various sensors are arranged inside for protection, which not only improves the detection accuracy rate, but also can effectively alleviate the aging of the sensors. Moreover, multiple sensors are used, the detection information is more complete, and the false alarm rate is low.

[0030] 5. The present device also provides 2 types of battery options, and the user can independently choose a lithium battery or an alkaline battery. Description of the Drawings

[0031] The present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 It is a schematic diagram of the bottom structure of the overall disassembled state of the present utility model;

[0033] Figure 2 It is a schematic diagram of the top structure of the overall disassembled state of the present utility model;

[0034] Figure 3 It is a schematic diagram of the internal structure of the protective shell of the present utility model;

[0035] Figure 4 It is a schematic diagram of the top structure of the electronic circuit board of the present utility model;

[0036] Figure 5 It is a schematic diagram of the internal structure of the smoke maze of the present utility model;

[0037] Figure 6 It is a schematic diagram of the side structure of the top installation of the maze cover of the present utility model.

[0038] In the accompanying drawings, the list of components represented by each reference numeral is as follows:

[0039] 1 - Protective shell, 11 - Card cover, 12 - Smoke channel, 13 - Light guide column, 14 - Buckle, 2 - Electronic circuit board, 21 - Buzzer, 22 - Communication card slot, 23 - Pre - installed positioning seat, 3 - Maze cover, 31 - Pin, 32 - Insect - proof net, 33 - Battery, 34 - Buckle groove, 4 - Smoke maze, 41 - Positioning plate, 42 - Insertion slot, 43 - Limit buckle, 5 - Fixed bottom plate. Specific embodiments

[0040] Please refer to Figures 1 to 6 As shown, the present utility model provides an independent smoke detector. To better understand the above - mentioned technical solution, the above - mentioned technical solution will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0041] In a specific embodiment of the technical solution of the present utility model:

[0042] It includes a protective shell 1, a fixed bottom plate 5, a maze cover 3 and a smoke maze 4;

[0043] The protective case 1 is a hollow housing, which is a closed housing with an open top. A smoke passage 12 is also provided around the side wall of the protective case 1. The smoke passage 12 is a fence-shaped through hole penetrating the side wall of the protective case 1. A light guide column 13 is provided at the bottom of the protective case 1. The light guide column 13 is a transparent columnar structure, and the inner end of the light guide column 13 extends deep into the protective case 1. Through the light guide column 13, the external light can be conveniently guided, facilitating the internal sensor to accurately detect the changes in smoke and light. Moreover, the light guide column 13 of this device is integrally connected to the protective case 1, with barb buckles set, and the structure is stable and not easy to fall off, effectively avoiding the situation of the light guide column 13 falling off and being lost.

[0044] That is, smoke can enter the interior of the protective case 1 through the smoke passage 12, and the protective case 1 is not in contact with the electronic circuit board 2.

[0045] The electronic circuit board 2 is a flat circuit board, and the electronic circuit board 2 can be detachably installed at the bottom of the smoke maze 4. A communication card slot 22 and a buzzer 21 are also embedded on the bottom surface of the electronic circuit board 2.

[0046] A card cover 11 is also provided at the bottom of the electronic circuit board 2. The card cover 11 is a flip cover, and the card cover 11 can be flip-openly installed at the bottom of the protective case 1. The communication card slot 22 is facing the opening of the card cover 11. The communication card slot 22 is inside the card cover 11. The buzzer 21 is also within the protection range of the card cover 11.

[0047] The fixed bottom plate 5 is a flat plate; the maze cover 3 is a frustum-shaped base. An annular insect-proof net 32 is provided at the bottom of the maze cover 3. The maze cover 3 and the insect-proof net 32 are an integrally formed structure. The maze cover 3 can be detachably locked at the bottom of the fixed bottom plate 5. The protective case 1 and the maze cover 3 can be detachably buckled to form a complete cavity. The electronic circuit board 2, the positioning plate 41, and the smoke maze 4 are all within the cavity formed by the protective case 1 and the maze cover 3.

[0048] Originally, 2 emitting tubes, 1 receiving tube, 1 shielding cover, 1 inductor, and 3 battery pins were to be installed at the bottom of the electronic circuit board 2. However, in this device, all these components are arranged on the same side. This structural design facilitates the automatic wave soldering in production. In the original design, the plug-in components were distributed on both sides of the circuit board. Since the maze body is prone to deformation when heated, multiple manual welding processes were required. With this design structure, after one-time plug-in, it directly passes through the wave soldering furnace for automatic welding to be completed, simplifying the production process and greatly improving the production capacity.

[0049] The smoke maze 4 can be detachably and stably buckled inside the insect-proof net 32. A battery 33 is provided at the top of the maze cover 3. The battery 33 includes alkaline batteries and lithium batteries. The positive and negative electrodes of the battery 33 are connected with pins 31. The joints of the smoke sensor, temperature sensor, and light sensor probe are also provided with pins 31. Each pin 31 extends below the positioning plate 41.

[0050] The bottom of the positioning plate 41 is also provided with a plug-in slot 42 and a plurality of limit buckles 43; the plug-in slot 42 is a groove protruding upward;

[0051] A pre-installed positioning seat 23 is also protruded upward on the top of the electronic circuit board 2; the pre-installed positioning seat 23 can be detachably and tightly inserted into the plug-in slot 42, and there is an interference fit between the pre-installed positioning seat 23 and the plug-in slot 42;

[0052] The electronic circuit board 2 can be detachably installed at the bottom of the smoke maze 4 through the pre-installed positioning seat 23 and the plug-in slot 42;

[0053] The limit buckle 43 is a PVC elastic hook, and a plurality of limit buckles 43 can be elastically separated and hung on the edge of the electronic circuit board 2.

[0054] Each pin 31 is plugged into a socket of the electronic circuit board 2;

[0055] A smoke sensor, a temperature sensor and a light sensor are also arranged at the bottom center of the fixed base plate 5;

[0056] A pre-installed positioning seat 23 is also protruded downward on the top of the electronic circuit board 2. The electronic circuit board 2 itself is a hard PCB circuit board, and the pre-installed positioning seat 23 is set on the electronic circuit board 2;

[0057] The protective shell 1 is tightly mounted on the electronic circuit board 2 by matching the position of the pre-installed positioning seat 23;

[0058] The side wall of the labyrinth cover 3 is provided with a plurality of buckle grooves 34, and the inner wall of the top opening of the protective shell 1 is also provided with a plurality of buckles 14, and the positions and numbers of the plurality of buckle grooves 34 correspond to the plurality of buckles 14 one by one, and the buckle grooves 34 and the buckles 14 can be detachably buckled;

[0059] The protective shell 1 is detachably locked to the bottom of the labyrinth cover 3 through the buckle groove 34 and the buckle 14. The buckle groove 34 is a commonly used rotary lock buckle, and can also be a threaded structure to ensure stable installation and facilitate knob clamping.

[0060] The protective shell 1 plays the role of shading and ventilation. It can not only shield and protect the electronic components, but also effectively block large particles of dust. Positioning holes and buckle grooves are also provided at the bottom of the protective shell 1, which can position and snap the protective shell 1 and the electronic circuit board 2. It also needs to be easy to disassemble and assemble to form a modular structure.

[0061] The smoke maze 4 is an annular maze channel. The annular maze channel of the smoke maze 4 is a hyperbolic reflector composed of multiple V-shaped grooves, so that the smoke maze 4 forms a grating and constitutes a maze hyperbolic reflective structure, which is beneficial to converge the emitted light from the transmitting tube and reflect it to the receiving tube. This structure enhances the optical signal intensity and improves the sensitivity.

[0062] The inner and outer rings of the smoke maze 4 are connected through a plurality of maze channels on the side wall. The side wall of the smoke maze 4 is also covered with an insect-proof net 32, which can effectively prevent flying insects or particulate matter from entering the sensor, effectively avoiding false alarms caused by flying insects and large particulate matter to this device. The maze-type ventilation channel can effectively eliminate most interference objects and also effectively avoid direct sunlight on the sensor, further reducing the interference factors in monitoring, thereby effectively improving the monitoring accuracy rate.

[0063] Each pin 31 is detachably connected to the circuit board of the electronic circuit board 2 through a terminal block;

[0064] The buzzer 21 is detachably inserted on the circuit at the bottom of the electronic circuit board 2, and the buzzer 21 is connected to the battery 33 through the terminal block on the electronic circuit board 2.

[0065] The circuit pins 31 of the smoke sensor, temperature sensor and light sensor probe penetrate downward through the through holes of the maze cover 3, and the pins 31 extend below the maze cover 3; each pin 31 is inserted into the socket of the electronic circuit board 2.

[0066] The smoke maze 4, electronic circuit board 2, fixed bottom plate 5 and protective shell 1 of this device are installed in a modular snap-in groove, which is convenient for installation and insertion, and is more convenient for the later maintenance and initial installation of the equipment.

[0067] It should be noted that:

[0068] 1. Current smoke alarms are generally set according to the actual wiring conditions of buildings. If the building structure meets the new fire safety requirements, smoke alarms that are designed to be connected to the building property management or the fire alarm platform are preferred. Such smoke alarms generally require a main unit and multiple extension units to be connected to each other to form a fire warning network. Once the main unit fails, all the extension units in the entire building will become ineffective. Or as long as there are network failures in the main unit or the building, including power outages and other abnormalities, the entire system will fail and become paralyzed. Each smoke alarm of this device exists independently, with its own independent sensor and communication method. It does not require a host or an overall network. Whether there is a power outage in the building or the host is damaged, this device will not become ineffective. 2. Due to its independent characteristics, this device can accurately locate the alarm point, does not rely on any wires, and has a higher alarm success rate. It will not fail to give a warning due to wire damage. Especially when there is a fire at the location of the smoke alarm, but the wire burns out first, then all the alarms on this wire will become ineffective, while this device does not have such a problem. As long as there is a fire, it will give an alarm first. Without wires, there is no problem of wire damage. 3. When installing the current smoke alarms internally, for the convenience of circuit board connection, the circuit board is attached to the base. It is necessary to remove all devices such as the housing, bracket, and anti-misoperation baffle of the entire alarm to connect the alarm to the wire. This device has the mobile communication card facing down, that is, the card cover 11 is exposed outside, which can facilitate the assembly of the mobile communication card before use, with a more reasonable structure and convenient installation.

[0069] On the top of the electronic circuit board 2, a pre-installed positioning seat 23 also protrudes upward; 2 transmitting tubes, 1 receiving tube, 1 shielding cover, 1 inductor, and 3 battery pins are installed on the pre-installed positioning seat 23. The plug-in components are soldered on the same side of the pre-installed seat. This structural design facilitates the automatic wave soldering in production. The original design was that the plug-in components were distributed on both sides of the circuit board. Since the maze body is prone to deformation when heated, it was necessary to solder them manually in multiple processes. In this design, after plugging in once, it directly passes through the wave soldering furnace for automatic soldering to completion, simplifying the production process and greatly improving the production capacity.

[0070] When this utility model is in use, it is adhered to the building wall through the top of the fixed base plate 5 or locked with bolts. The card cover 11 is disassembled, and a mobile communication card is installed into the communication card slot 22 to complete the installation.

[0071] When a fire breaks out and smoke appears, various sensors enclosed inside the smoke maze 4 generate abnormal detection data. The data is collected through the circuit board on the electronic circuit board 2, and is transmitted to the platform via the chip and mobile network thereon, and then sent to the fire control platform. At the same time, the buzzer 21 will also be activated to issue an alarm. Such a circuit board and the chip thereon are common devices of the smoke alarm. Any smoke alarm requires a suitable circuit board and a single-chip microcomputer chip to monitor the sensor data, which will not be elaborated here as existing circuit boards and chips can be utilized.

[0072] When the circuit board is damaged, the protective case 1 can be disassembled to remove the electronic circuit board 2, and a new circuit board can be replaced and inserted onto the pin 31. If necessary, it can also be strengthened by soldering.

[0073] A light guide column 13 is also provided at the bottom of the protective case 1. The light guide column 13 is a transparent columnar structure, and its inner end extends deep into the protective case 1. Through the light guide column 13, it is convenient to guide external light, facilitating the internal sensors to accurately detect changes in smoke and light. Moreover, the light guide column 13 of this device is integrally connected to the protective case 1. The light guide column 13 also has the function of key silencing. It adopts a crescent-shaped cylinder, and a cylinder extends from the back of the upper cover. A square hole is provided in the middle of its outer arc. A hook matching with it is provided on the key light guide column. When the key light guide column is pushed into the extended column, the hook is caught in the square hole, fixing the key light guide in the column and making it not easy to fall off. This structure solves the problem that the key light guide column in the original design was prone to falling off and being lost.

[0074] Replacing the battery 33 is more convenient. The entire fixed bottom plate 5 and the electronic circuit board 31 are removed, and the internal smoke maze 4 and the maze cover 3 are integrally disassembled to replace the battery 33. Since the pins 31 of the battery are connected to the pluggable wiring terminals, they can be connected as long as they are plugged tightly, and they are separated after being pulled out. Each component forms a modular structure, making replacement and disassembly more convenient. Installing, replacing modules, replacing the battery 33, and the mobile communication card of this device are all very convenient. The circuit pins of various sensors such as the smoke sensor, temperature sensor, and light sensor probe extend downward and are inserted onto the circuit board through the wiring terminals, which is convenient for plugging and unplugging, and is also more convenient for connection, use, and replacement. This device also adds a two-battery compatibility design, and users can choose to use lithium batteries or alkaline batteries by themselves.

[0075] The "upper" of this device refers to the side connected to the building, and the "lower" refers to the side facing outward for easy operation. The illustrations of this device are all shown in the installed state, and the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0076] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered by the scope protected by the claims of the present invention.

Claims

1. An independent smoke detector, characterized in that, Including: A protective case (1), an electronic circuit board (2), a labyrinth cover (3), a smoke labyrinth (4), and a fixed base plate (5); The protective case (1) is a hollow housing. The protective case (1) is a closed housing with an opening at the top. A smoke passage (12) is also provided in a circular shape on the side wall of the protective case (1). The smoke passage (12) is a fence-shaped through hole penetrating the side wall of the protective case (1). A light guide column (13) is also provided at the bottom of the protective case (1). The light guide column (13) is a transparent columnar structure, and the inner end of the light guide column (13) extends into the interior of the protective case (1); The smoke labyrinth (4) is an annular labyrinth passage. A positioning plate (41) is provided at the bottom of the smoke labyrinth (4). A smoke sensor, a temperature sensor, and a light sensor probe are also provided on the top of the positioning plate (41). The smoke labyrinth (4) is arranged around the smoke sensor, the temperature sensor, and the light sensor probe; The electronic circuit board (2) is a flat circuit board. The electronic circuit board (2) can be detachably installed at the bottom of the smoke labyrinth (4); A communication card slot (22) and a buzzer (21) are also embedded on the bottom surface of the electronic circuit board (2); The fixed base plate (5) is a flat plate; The labyrinth cover (3) is a frustum-shaped base. An annular insect-proof net (32) is provided at the bottom of the labyrinth cover (3). The labyrinth cover (3) can be detachably locked to the bottom of the fixed base plate (5). The protective case (1) and the labyrinth cover (3) can be detachably buckled to form a complete cavity; The electronic circuit board (2), the positioning plate (41), and the smoke labyrinth (4) are all located in the cavity formed by the protective case (1) and the labyrinth cover (3); The smoke labyrinth (4) can be detachably and stably buckled inside the insect-proof net (32); A battery (33) is provided at the top of the labyrinth cover (3). The positive and negative electrodes of the battery (33) are connected to pins (31). Pins (31) are also provided at the connectors of the smoke sensor, the temperature sensor, and the light sensor probe. Each of the pins (31) extends below the positioning plate (41); Each of the pins (31) is inserted into the socket of the electronic circuit board (2).

2. The independent smoke detector according to claim 1, wherein: The protective case (1) does not contact the electronic circuit board (2); A cover (11) is also provided at the bottom of the electronic circuit board (2). The cover (11) is a flip cover. The cover (11) can be opened and installed at the bottom of the protective case (1). The communication card slot (22) is facing the opening of the cover (11); The communication card slot (22) is located inside the cover (11); The buzzer (21) is also within the protection range of the cover (11).

3. An independent smoke detector according to claim 1, characterized in that: A plurality of buckle grooves (34) are provided on the side wall of the labyrinth cover (3). A plurality of buckles (14) are also provided on the inner wall of the top opening of the protective case (1). The positions and numbers of the plurality of buckle grooves (34) and the plurality of buckles (14) correspond one by one. The buckle grooves (34) and the buckles (14) can be detachably buckled; The protective case (1) can be detachably locked to the bottom of the labyrinth cover (3) through the buckle grooves (34) and the buckles (14).

4. An independent smoke detector according to claim 1, characterized in that: Each of the pins (31) is detachably connected to the circuit board of the electronic circuit board (2) through a terminal; The buzzer (21) is detachably inserted on the circuit at the bottom of the electronic circuit board (2), and the buzzer (21) is connected to the battery (33) through the terminal on the electronic circuit board (2).

5. An independent smoke detector according to claim 1, characterized in that: A plugging groove (42) and a plurality of limiting buckles (43) are further provided at the bottom of the positioning plate (41); the plugging groove (42) is a groove protruding upward; A pre-installed positioning seat (23) is further protruded upward at the top of the electronic circuit board (2); the pre-installed positioning seat (23) is detachably and tightly inserted into the plugging groove (42), and an interference fit is provided between the pre-installed positioning seat (23) and the plugging groove (42); The electronic circuit board (2) is detachably installed at the bottom of the smoke maze (4) through the pre-installed positioning seat (23) and the plugging groove (42); The limiting buckle (43) is a PVC elastic hook, and a plurality of the limiting buckles (43) are elastically and detachably hung on the edge of the electronic circuit board (2).

Images