CN214226086U - Double-light source wireless smoke alarm - Google Patents

Abstract

The utility model relates to a smoke detection technical field especially relates to a wireless smoke alarm of two light sources, include: a housing; the smoke detector comprises an optical receiver and two light sources, wherein the two light sources respectively emit light with different wavelengths, and the optical receiver is used for receiving the light emitted by the two light sources; the main circuit board is arranged in the shell, the light receiver and the two light sources are electrically connected with the main circuit board, the main circuit board is provided with a control circuit module and a wireless communication module, and the control circuit module is electrically connected with the wireless communication module. The double-light-source wireless smoke alarm can distinguish different types of smoke and common interference sources, and improves the capability of the double-light-source wireless smoke alarm in eliminating the interference sources and avoiding false alarm. Meanwhile, the states of the alarms and the like can be uploaded to the management platform by utilizing the wireless communication module, and managers can also give instructions to the plurality of double-light-source wireless smoke alarms from the management platform, so that centralized remote control is realized.

Description

Double-light source wireless smoke alarm

Technical Field

The utility model relates to a smoke detection technical field especially relates to a wireless smoke alarm of two light sources.

Background

At present, a photoelectric smoke detection technology is widely applied to various smoke alarms, wherein the most common scheme is to detect smoke concentration by adopting infrared light, and the output current of an infrared receiver is in direct proportion to the smoke concentration. According to the technical scheme, the approximate concentration of the smoke can be sensed, but the size of particulate matters and the type of the smoke cannot be identified, the smoke with small particle size is insensitive to reaction, and particles such as dust, oil smoke and water mist are easy to make a detector generate misjudgment.

SUMMERY OF THE UTILITY MODEL

Therefore, a double-light-source wireless smoke alarm is needed to solve the problem that the traditional smoke alarm cannot distinguish the size and the type of particulate matters and is easy to generate false alarm.

The above purpose is realized by the following technical scheme:

a dual light source wireless smoke alarm comprising:

a housing having a detection space formed thereon;

the smoke detector is arranged in the shell and comprises an optical receiver and two light sources, the two light sources respectively emit light with different wavelengths to the detection space, and the optical receiver is used for receiving the light which is emitted by the two light sources and scattered by smoke particles in the detection space;

the main circuit board is arranged in the shell, the light receiver and the two light sources are electrically connected with the main circuit board, the main circuit board is provided with a control circuit module and a wireless communication module, and the control circuit module is electrically connected with the wireless communication module.

In one embodiment, the smoke detector further comprises a detection circuit board and a control chip integrated with an analog front-end circuit, the control chip is arranged on the detection circuit board, the optical receiver and the two light sources are arranged on the control chip, the optical receiver and the two light sources are electrically connected with the detection circuit board, and the detection circuit board is electrically connected with the control circuit module.

In one embodiment, the double-light-source wireless smoke alarm further comprises a smoke detection maze, the smoke detection maze is covered on the light receiver and the two light sources, the smoke detection maze is provided with a plurality of smoke inlet channels with the same size, and the smoke detection maze is used for forming a maze type detection space.

In one embodiment, the smoke detection labyrinth comprises an integrally formed top plate and a plurality of spacers, the plurality of spacers are arranged on the top plate at regular intervals around the central axis of the top plate, and the top plate is a conical plate protruding towards the side where the plurality of spacers are located.

In one embodiment, the dual light source wireless smoke alarm further comprises:

the smoke inlet support is detachably connected with the shell, the smoke inlet support is covered outside the smoke detection labyrinth, and a plurality of openings with the same size are circumferentially arranged on the smoke inlet support; and

the insect-proof net is sleeved outside the smoke inlet support.

In one embodiment, the main circuit board is further provided with a power circuit module, the power circuit module is electrically connected with the control circuit module, the dual-light-source wireless smoke alarm further comprises a battery pack, and the power circuit module is electrically connected with the battery pack.

In one embodiment, the main circuit board is further provided with an extended function circuit module, the extended function circuit module is electrically connected with the control circuit module, the dual-light-source wireless smoke alarm further comprises a loudspeaker, and the extended function circuit module is electrically connected with the loudspeaker.

In one embodiment, the dual-light-source wireless smoke alarm further comprises a temperature and humidity sensor, the temperature and humidity sensor is arranged on the main circuit board and electrically connected with the extended function circuit module, and the shell is provided with a detection window corresponding to the temperature and humidity sensor.

In one embodiment, the wireless communication module is a LoRa module.

In one embodiment, the control circuit module comprises a microcontroller integrated with an analog front end circuit, and the optical receiver is electrically connected with the microcontroller.

The double-light-source wireless smoke alarm at least has the following technical effects:

the utility model discloses a wireless smoke alarm of two light sources, it has shell, smoke detector and main circuit board, is formed with the detection space on the shell, and smoke detector includes light receiver and two light sources, and two light sources send the light of different wavelengths respectively to the detection space and are received by light receiver, and main circuit board is equipped with control circuit module and wireless communication module. The light receiver can output two sets of current signals, and the control circuit module can distinguish different types of smog and common interference sources by analyzing the current signals of the light receiver, so that the capability of the double-light-source wireless smog alarm for eliminating the interference sources and avoiding false alarm is improved. Meanwhile, the control circuit module can transmit the working state or field environment state information of the double-light-source wireless smoke alarm to the management platform through the wireless communication module, and managers can also issue instructions from the management platform, and the instructions are issued to the multiple double-light-source wireless smoke alarms in a wireless communication mode, so that centralized remote control is realized.

Drawings

Fig. 1 is a schematic structural view of a dual-light-source wireless smoke alarm according to an embodiment of the present invention;

FIG. 2 is an exploded view of the structure shown in FIG. 1;

FIG. 3 is a schematic view of the smoke detection principle of the arrangement shown in FIG. 1;

FIG. 4 is a schematic view of the smoke detection maze of the configuration of FIG. 1;

fig. 5 is a schematic sectional view a-a of the structure shown in fig. 4.

Wherein:

100-a housing;

110-a smoke inlet support; 120-projection;

200-a smoke detector;

210-a light source; 220-an optical receiver;

230-probing the circuit board; 240-control chip;

300-a main circuit board;

310-key switches;

400-smoke detection maze;

410-a top plate; 420-a spacer;

500-insect-proof net;

600-a speaker;

700-temperature and humidity sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description of the dual light source wireless smoke alarm of the present invention is made in detail by embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and 2, a dual light source wireless smoke alarm according to an embodiment of the present invention includes a housing 100, a smoke detector 200, and a main circuit board 300. The housing 100 forms a detection space, the smoke detector 200 is disposed in the housing 100, the smoke detector 200 includes a light receiver 220 and two light sources 210, the two light sources 210 respectively emit light with different wavelengths to the detection space, and the light receiver 220 is used for receiving the light emitted by the two light sources 210 and scattered by smoke particles in the detection space. The main circuit board 300 is disposed in the housing 100, the light receiver 220 and the two light sources 210 are electrically connected to the main circuit board 300, and the main circuit board 300 is provided with a control circuit module and a wireless communication module, and the control circuit module is electrically connected to the wireless communication module.

Wherein the two light sources 210 may be infrared light with a wavelength of 470nm and blue light with a wavelength of 850nm, respectively. The light receiver 220 includes an infrared light receiver and a blue light receiver, respectively. It is understood that the minute particles having different particle sizes have different scattering characteristics. Therefore, the light emitted from the two light sources 210 is scattered by smoke particles and reaches the light receiver 220, and the light receiver 220 will generate two sets of current signals. The two groups of current signals are processed by an analog front-end circuit and then converted into voltage signals in direct proportion to the smoke concentration. After the microcontroller processes the voltage numerical values of the two channels of infrared light and blue light output by the analog front-end circuit through a series of operations, the ratio of the power transmission ratio PTR of the two channels is calculated, and the parameter can distinguish the particle size, thereby distinguishing the smoke of different types (such as smoldering polyurethane smoke, smoldering wood smoke, paper burning smoke and the like) and common interference sources (such as oil smoke and water mist), and improving the capability of the double-light-source wireless smoke alarm for eliminating the interference sources and avoiding false alarm.

The wireless communication module may include a wireless transceiver chip and an antenna. The wireless transceiver chip and the control circuit module interact with the input and output interface through a data transmission bus. The wireless transceiver chip adopts the mode of intermittent type nature work in order to reduce the alarm consumption, saves battery power. The microcontroller controls the power supply of the wireless transceiver chip through the output interface. When the alarm uploads information, the control circuit module transmits information such as the state of the alarm, the field temperature and the humidity to the wireless transceiver chip, and the wireless transceiver chip sends the information to the wireless network, so that the information is uploaded to the management platform. The manager can also issue an instruction from the management platform, and the instruction is issued to the plurality of smoke alarms through the wireless communication network, so that centralized remote control is realized. In one embodiment, the wireless communication module is a LoRa module, wherein the chinese name of LoRa is Long Range Radio (Long Range Radio). In this embodiment, wireless communication module adopts the LoRa module, can improve wireless signal transmission distance, reduces alarm operating power. Of course, in other embodiments, the wireless communication module may also implement the wireless communication function by using technologies such as Zigbee, WiFi, NB-IoT (narrowband internet of things), bluetooth, and the like.

As shown in fig. 3, as a better embodiment, the smoke detector 200 further includes a detection circuit board 230 and a control chip 240 integrated with an analog front-end circuit, the control chip 240 is disposed on the detection circuit board 230, the light receiver 220 and the two light sources 210 are disposed on the control chip 240, the light receiver 220 and the two light sources 210 are electrically connected to the detection circuit board 230, and the detection circuit board 230 is electrically connected to the control circuit module. In this embodiment, the smoke detector 200 adopts the control chip 240 in which the light source 210, the light receiver 220 and the analog front-end circuit are integrated, and compared with an independent analog front-end circuit, the integrated circuit has higher device precision and smaller generated noise, reduces errors and interferences of detection signals, and improves the accuracy and reliability of a signal processing circuit.

The functions of the analog front-end circuit generally include transimpedance amplification and ADC analog-to-digital conversion. The control circuit module communicates with the control chip 240 through the data transmission bus, and modifies the value of the register configured inside the control chip 240, thereby adjusting the emission frequency and emission current of the light source 210 in the smoke detector 200, and the amplification factor of the transimpedance amplification in the analog front-end circuit, the sampling frequency of the ADC converter, and other parameters. These parameters are related to sensitivity, accuracy, operating power (power consumption). For example, increasing the emission frequency, emission current of the light source 210 may increase sensitivity; the amplification factor of transimpedance amplification in the analog front-end circuit is improved so as to improve the sensitivity; the sampling frequency of the analog front-end circuit is increased to improve the accuracy. Of course, sensitivity, accuracy, and power consumption are mutually limiting, requiring engineers to select relatively suitable parameters according to different application requirements.

Alternatively, as another preferred embodiment, the control circuit module includes a microcontroller integrated with an analog front-end circuit, and the optical receiver 220 is electrically connected to the microcontroller. In this embodiment, the control circuit module adopts the microcontroller integrated with the analog front-end circuit, and compared with an independent analog front-end circuit, the integrated circuit has higher device precision and lower generated signal noise, reduces errors and interference of detection signals, and improves the accuracy and reliability of the signal processing circuit. It should be noted that the dual light source wireless smoke alarm may be implemented by using the control chip 240 integrated with the analog front end circuit or by using the microcontroller integrated with the analog front end circuit.

Referring to fig. 2, in one embodiment, the dual light source wireless smoke alarm further comprises a smoke detection maze 400, wherein the smoke detection maze 400 is covered on the light receiver 220 and the two light sources 210, the smoke detection maze 400 is provided with a plurality of smoke inlet channels with the same size, and the smoke detection maze 400 is used for forming a maze type detection space. The smoke detection maze 400 can be fixed on the main circuit board 300 by a bottom buckle, and the control chip 240 is placed in the center of the bottom of the detection space of the smoke detection maze 400. When smoke exists in the detection space, light emitted by the two light sources 210 reaches the light receiver 220 after being scattered by smoke particles. The more smoke particles, the stronger the light received by the light receiver 220. The smoke detection maze 400 used in this example has a detection space of about phi 20mm by 12.5mm, which reduces the volume of the dual-light-source wireless smoke alarm and makes the dual-light-source wireless smoke alarm more suitable for residential and commercial buildings. The smoke inlet channels of the smoke detection labyrinth 400 are consistent in size, and the orientation consistency performance of the alarm is guaranteed.

As shown in fig. 4 and 5, the smoke detection labyrinth 400 further includes a top plate 410 and a plurality of spacers 420, the plurality of spacers 420 being disposed on the top plate 410 at regular intervals around a central axis of the top plate 410, the top plate 410 being a tapered plate protruding toward a side where the plurality of spacers 420 are located. Preferably, smoke detection maze 400 is a one-piece structure, i.e., top plate 410 and plurality of spacers 420 are integrally formed. The inner side of the top plate 410 of the smoke detection maze 400 is formed into a conical structure, so that light rays emitted by the light source 210 are prevented from being directly reflected to the light receiver 220 through the inner wall of the top part, and the accuracy of the smoke detector in detecting the smoke concentration is ensured.

Referring to fig. 2, in one embodiment, the dual-light source wireless smoke alarm further includes a smoke inlet support 110 and an insect-proof net 500, the smoke inlet support 110 is detachably connected to the housing 100, the smoke inlet support 110 is covered outside the smoke detection maze 400, and a plurality of openings with the same size are circumferentially arranged on the smoke inlet support 110. The insect-proof net 500 is sleeved outside the smoke inlet support 110. Wherein, the smoke inlet support 110 can be detachably connected with the casing 100 by using a snap structure. Or the smoke inlet support 110 may be detachably coupled to the housing 100 using screws. The smoke inlet support 110 of the embodiment is circumferentially provided with a plurality of openings with the same size, so that smoke can uniformly enter a detection space formed by the smoke detection labyrinth 400 from all directions, and the direction consistency performance of the alarm is ensured. The insect net 500 ensures that enough smoke can penetrate through the insect net 500 to enter the detection space, and simultaneously can prevent insects from entering the smoke detection maze 400. Wherein, the insect-proof net 500 may adopt a net structure with a mesh diameter of about 1 mm.

On the basis of the above embodiment, the main circuit board 300 is further provided with a power supply circuit module, the power supply circuit module is electrically connected with the control circuit module, the dual-light-source wireless smoke alarm further comprises a battery pack, and the power supply circuit module is electrically connected with the battery pack. Preferably, the power circuit module may include an anti-reverse connection circuit, a filtering circuit and a voltage stabilizing circuit. The anti-reverse connection circuit can prevent the circuit from being damaged when the circuit is inadvertently reverse connected, and the filtering and voltage stabilizing circuit provides stable and reliable working voltage for functional circuits such as the control circuit module and the like.

Referring to fig. 2, on the basis of the above embodiment, the main circuit board 300 is further provided with an extended function circuit module, the extended function circuit module is electrically connected to the control circuit module, the dual-light source wireless smoke alarm further includes a speaker 600, and the extended function circuit module is electrically connected to the speaker 600. Furthermore, the shell 100 may further be provided with a detachment detection structure, and the extended function circuit module includes a detachment detection circuit, thereby realizing a function of detecting whether the alarm is detached.

In one embodiment, the detachment detection structure includes a key switch 310, and the key switch 310 is disposed on the main circuit board 300. The housing 100 includes an upper case and a lower case which are coupled to each other, and the main circuit board 300 is mounted in a space between the upper case and the lower case. The key switch 310 has a spring plate, and the bottom case has a protrusion 120 corresponding to the spring plate. In the non-detached state, the protrusion 120 of the bottom case presses the elastic sheet of the key switch 310 on the main circuit board 300, and the key switch 310 is in the off state. Under the dismantlement state, protruding 120 loosens the shell fragment, and key switch 310 is the closure state this moment to the wireless smoke alarm of dual-light source can be through wireless communication module to management platform routing information, the suggestion managers inspection alarm has the anomaly.

Referring to fig. 2, on the basis of the above embodiment, the dual-light-source wireless smoke alarm further includes a temperature and humidity sensor 700, the temperature and humidity sensor 700 is disposed on the main circuit board 300 and electrically connected to the extended function circuit module, and the housing 100 is provided with a detection window corresponding to the temperature and humidity sensor 700.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A dual light source wireless smoke alarm, comprising:

a housing having a detection space formed thereon;

the smoke detector is arranged in the shell and comprises an optical receiver and two light sources, the two light sources respectively emit light with different wavelengths to the detection space, and the optical receiver is used for receiving the light emitted by the two light sources and scattered by smoke particles in the detection space;

the main circuit board is arranged in the shell, the optical receiver and the two light sources are electrically connected with the main circuit board, a control circuit module and a wireless communication module are arranged on the main circuit board, and the control circuit module is electrically connected with the wireless communication module.

2. The dual-light-source wireless smoke alarm device of claim 1, wherein the smoke detector further comprises a detection circuit board and a control chip integrated with an analog front-end circuit, the control chip is disposed on the detection circuit board, the light receiver and the two light sources are disposed on the control chip, the light receiver and the two light sources are electrically connected with the detection circuit board, and the detection circuit board is electrically connected with the control circuit module.

3. A dual light source wireless smoke alarm according to claim 1 or 2 further comprising a smoke detection labyrinth, said smoke detection labyrinth being housed over said light receiver and said two light sources, said smoke detection labyrinth having a plurality of smoke inlet channels of uniform size, said smoke detection labyrinth being adapted to form a labyrinth of said detection spaces.

4. A dual light source wireless smoke alarm according to claim 3 wherein said smoke detection labyrinth comprises an integral top plate and a plurality of spacers, said plurality of spacers being disposed on said top plate at uniform intervals about a central axis of said top plate, said top plate being a tapered plate projecting to a side where said plurality of spacers are located.

5. A dual light source wireless smoke alarm according to claim 3 further comprising:

the smoke inlet support is detachably connected with the shell, the smoke inlet support is covered outside the smoke detection labyrinth, and a plurality of openings with the same size are circumferentially arranged on the smoke inlet support; and

and the insect-proof net is sleeved on the outer side of the smoke inlet support.

6. The dual-light source wireless smoke alarm device of claim 1, wherein the main circuit board is further provided with a power circuit module, the power circuit module is electrically connected with the control circuit module, the dual-light source wireless smoke alarm device further comprises a battery pack, and the power circuit module is electrically connected with the battery pack.

7. The dual-light source wireless smoke alarm device according to claim 1, wherein the main circuit board further comprises an extended function circuit module, the extended function circuit module is electrically connected with the control circuit module, the dual-light source wireless smoke alarm device further comprises a speaker, and the extended function circuit module is electrically connected with the speaker.

8. The wireless smoke alarm of claim 7, further comprising a temperature and humidity sensor, wherein the temperature and humidity sensor is disposed on the circuit board and electrically connected to the extended function circuit module, and the housing is provided with a detection window corresponding to the temperature and humidity sensor.

9. The dual light source wireless smoke alarm of claim 1, wherein the wireless communication module is a LoRa module.

10. The dual light source wireless smoke alarm of claim 1, wherein said control circuit module comprises a microcontroller integrated with analog front end circuitry, said light receiver being electrically connected to said microcontroller.

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