CN111968333A - Self-powered fire alarm device and system - Google Patents
Self-powered fire alarm device and system Download PDFInfo
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- CN111968333A CN111968333A CN202010971592.7A CN202010971592A CN111968333A CN 111968333 A CN111968333 A CN 111968333A CN 202010971592 A CN202010971592 A CN 202010971592A CN 111968333 A CN111968333 A CN 111968333A
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- 238000001816 cooling Methods 0.000 claims abstract description 41
- 238000009413 insulation Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 description 5
- 230000004044 response Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/005—Fire alarms; Alarms responsive to explosion for forest fires, e.g. detecting fires spread over a large or outdoors area
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
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- Fire Alarms (AREA)
Abstract
The invention relates to a self-powered fire alarm device and a self-powered fire alarm system, and mainly relates to the field of fire early warning. The application provides a fire alarm device includes: the solar thermoelectric generation device comprises a shell, a heat insulation layer, a cooling layer, a thermoelectric generation piece, a solar panel and an alarm device; this thermoelectric generation piece one side is provided with the cooling layer, the opposite side is provided with solar cell panel, then when the conflagration takes place around this fire alarm device, when external environment's temperature produced huge change, this thermoelectric generation piece is close to one side temperature rising of this solar cell panel, one side temperature variation condition near this cooling layer is less, then this thermoelectric generation piece both sides can produce great difference in temperature, according to the thermoelectric generation principle, then can produce electric current on this thermoelectric generation piece, and because alarm device is connected with this thermoelectric generation piece electricity, then when this thermoelectric generation piece produces electric current, this alarm device reports to the police.
Description
Technical Field
The invention relates to the field of fire early warning, in particular to a self-powered fire alarm device and a self-powered fire alarm system.
Background
The climate is warmed, the extreme weather is increased, the global forest fire is in the high-occurrence period, and the forest fire risk is aggravated; forest resources are increasing day by day, the combustible load in the forest is continuously increased, China enters a forest fire high-risk period, and the forest fire prevention pressure is aggravated; influenced by traditional customs and various operation activities, wildfire is increased, China is still in the period of forest fire incident, and the difficulty of forest fire prevention is increased. The number of large-area forest watchtowers is insufficient, supporting living facilities are simple and crude, the application level of a forest fire video monitoring system is not high, and the fire watchcoverage rate is only 68.1%. The satellite forest fire monitoring timeliness is not high, the spatial resolution is only 1 kilometer, and the identification capability needs to be improved. In 2016, the early warning of the forest fire in China is mainly achieved by electronic watchtowers and artificial watchtowers, 3245 forest fire element monitoring stations are arranged in the country, 746 combustible factor acquisition stations are arranged, 9312 artificial watchtowers are arranged, 3998 sets of video monitoring systems are arranged, and the fire observation coverage rate is 68.1%. Aiming at the current situations that the early warning response mechanism is imperfect, the forest fire monitoring precision and timeliness are not high, and blind areas exist in observation, an informatization technology and a modern high-tech means are urgently needed to be utilized, the application of a new technology is strengthened, an early warning mode is innovated, response measures are strengthened, and a perfect forest fire danger early warning response system is constructed.
The fire alarm device in the prior art mainly detects the temperature in the coverage area of the device, and when the temperature reaches a preset threshold value, the fire alarm device gives an alarm.
However, when the external environment is complicated, the ignition point of some inflammable substances is low, and if the environment temperature is judged to be greater than the preset threshold value to judge whether a fire disaster occurs, the fire behavior of the inflammable substances with the low ignition point is easily ignored, and the alarm and early warning are not easy to be performed when the fire disaster just occurs.
Disclosure of Invention
The invention aims to provide a self-powered fire alarm device and a self-powered fire alarm system aiming at the defects in the prior art, so as to solve the problems that in the prior art, when the external environment is relatively complex, the ignition point of some inflammable matters is relatively low, if the environment temperature is judged to be greater than a preset threshold value to judge whether a fire disaster occurs, the fire behavior of the inflammable matters with relatively low ignition point is easily ignored, and the alarm and early warning are not easy to be performed when the fire disaster occurs.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, the present application provides a self-powered fire alarm device, comprising: the solar thermoelectric generation device comprises a shell, a heat insulation layer, a cooling layer, a thermoelectric generation piece, a solar panel and an alarm device; inner wall of the shell is provided with the insulating layer, casing one end is equipped with the hole, hole and insulating layer constitute the recess, the inside cooling layer that is provided with respectively of recess, thermoelectric generation piece and solar cell panel, wherein, the cooling layer is filled inside the recess, one side that the insulating layer was kept away from to the cooling layer is provided with the thermoelectric generation piece, one side that the insulating layer was kept away from to the thermoelectric generation piece is provided with solar cell panel, alarm device sets up inside the casing, and alarm device is connected with solar cell panel and thermoelectric generation piece electricity respectively.
Optionally, the housing comprises: the first shell and the second shell are in threaded connection.
Optionally, the material of the first shell and the second shell is polyethylene material.
Optionally, the specific heat capacity of the cooling layer is much greater than that of the thermoelectric generation sheet.
Optionally, the thermal insulation layer is made of asbestos cloth.
Optionally, the alarm device comprises: at least one of an audible and visual alarm device, an audible alarm device and an optical alarm device.
Optionally, the fire alarm device further comprises a signal transmitting device, wherein the signal transmitting device is arranged inside the shell and electrically connected with the thermoelectric generation piece.
Optionally, the fire alarm device further comprises a heat energy absorbing film coated on an outer wall of the housing.
In a second aspect, the present application provides a self-powered fire alarm system, comprising: the fire alarm system comprises a signal receiving device, a processor and the fire alarm device of any one of the first aspect, wherein the signal receiving device is electrically connected with the processor and is used for receiving an alarm signal generated by the fire alarm device.
The invention has the beneficial effects that:
the application provides a fire alarm device includes: the solar thermoelectric generation device comprises a shell, a heat insulation layer, a cooling layer, a thermoelectric generation piece, a solar panel and an alarm device; the inner wall of the shell is provided with a heat insulation layer, one end of the shell is provided with a hole, the hole and the heat insulation layer form a groove, the groove is internally provided with a cooling layer, a thermoelectric generation sheet and a solar cell panel respectively, wherein the cooling layer is filled in the groove, one side of the cooling layer, far away from the heat insulation layer, is provided with the thermoelectric generation sheet, one side of the thermoelectric generation sheet, far away from the heat insulation layer, is provided with the solar cell panel, an alarm device is arranged in the shell and is electrically connected with the solar cell panel and the thermoelectric generation sheet respectively, one side of the thermoelectric generation sheet is provided with the cooling layer, the other side is provided with the solar cell panel, when a fire disaster happens around the fire alarm device, the temperature of the external environment is greatly changed, the temperature of one side, close to the solar cell panel, of the thermoelectric generation sheet is increased, the temperature change condition of one side, according to the principle of temperature difference power generation, current can be generated on the temperature difference power generation sheet, and the alarm device gives an alarm when the temperature difference power generation sheet generates current as the alarm device is electrically connected with the temperature difference power generation sheet; and this shells inner wall's insulating layer makes the inside and outside temperature of this casing produce huge temperature difference, the inside alarm device who sets up of protection casing, in addition, because the high specific heat capacity of cooling layer, make the upper and lower surface difference in temperature of thermoelectric generation piece increase, in earlier stage when the conflagration emergence, the volume that external temperature rose is less, the cooling layer is equivalent to the increase of the difference in temperature with thermoelectric generation piece both sides, this fire alarm device has improved the sensitivity of this fire alarm device in earlier stage before the conflagration takes place, and make the fire alarm device of this application carry out the alarm early warning in the conflagration emergence initial stage.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a self-powered fire alarm apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of another self-energizing fire alarm device according to an embodiment of the present invention;
fig. 3 is a schematic structural view of another self-powered fire alarm device according to an embodiment of the present invention.
Icon: 10-a housing; 11-a first housing; 12-a second housing; 20-a thermal insulation layer; 30-a cooling layer; 40-thermoelectric power generation pieces; 50-a solar panel; 60-an alarm device; 70-signal emitting means.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiment is a metal plate embodiment of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In order to make the implementation of the present invention clearer, the following detailed description is made with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a self-powered fire alarm apparatus according to an embodiment of the present invention; as shown in fig. 1, the present application provides a self-powered fire alarm device, including: the solar thermoelectric generation device comprises a shell 10, a heat insulation layer 20, a cooling layer 30, a thermoelectric generation sheet 40, a solar panel 50 and an alarm device 60; casing 10 inner wall is provided with insulating layer 20, casing 10 one end is equipped with the hole, hole and insulating layer 20 constitute the recess, the inside cooling layer 30 that is provided with respectively of recess, thermoelectric generation piece 40 and solar cell panel 50, wherein, cooling layer 30 fills inside the recess, one side that insulating layer 20 was kept away from to cooling layer 30 is provided with thermoelectric generation piece 40, one side that insulating layer 20 was kept away from to thermoelectric generation piece 40 is provided with solar cell panel 50, alarm device 60 sets up inside casing 10, and is connected with thermoelectric generation piece 40 electricity.
The shape of the housing 10 may be cylindrical, spherical, or hemispherical, and is not specifically limited herein, for convenience of description, the shape of the housing 10 is illustrated as hemispherical, the thermal insulation layer 20 is disposed inside the hemispherical, one end of the housing 10 is dug to form a hole, the hole penetrates through the wall of the housing 10, so that the hole and the thermal insulation layer 20 form a groove, the thermal insulation layer 20 serves as the bottom of the groove, the wall of the hole serves as the wall of the thermal insulation layer 20, the groove is filled with the cooling layer 30, generally, the cooling layer 30 is fully paved at the bottom of the groove, the amount of the cooling layer 30 is set according to actual needs, and is not specifically limited herein, the thermoelectric generation sheet 40 is disposed above the cooling layer 30, and equivalently, the thermoelectric generation sheet 40 seals the cooling layer 30 inside the groove, one side of the thermoelectric generation piece 40 is tightly attached to the cooling layer 30, the other side of the thermoelectric generation piece 40 is provided with a solar panel 50, the solar panel 50 is used for converting solar energy into electric energy when sunlight exists and is used as a preparation power supply, generally, when the power supply of the alarm device 60 is the thermoelectric generation piece 40, when a fire disaster occurs in the initial stage, the two sides of the thermoelectric generation piece 40 have large temperature difference, so that the thermoelectric generation piece 40 generates current, the current excites the alarm device 60 to alarm, when the fire disaster occurs for a long time, the temperature of a fire scene is overhigh, so that the overall temperature of the fire alarm device in the application is overhigh, the temperature of the two sides of the thermoelectric generation piece 40 is overhigh, namely, the temperature difference measured by the thermoelectric generation piece 40 is basically 0, so that the thermoelectric generation piece 40 cannot generate electricity with high efficiency, at this time, the solar panel 50 is used as the preparation power supply, the alarm device 60 is powered, so that the alarm device 60 gives an alarm to avoid causing the delay of fire.
Optionally, the fire alarm apparatus further includes a capacitor or a battery for storing the amount of electricity generated from the solar cell panel 50, and the capacitor or the battery is generally disposed between the solar cell panel 50 and the alarm apparatus 60.
FIG. 2 is a schematic structural view of another self-energizing fire alarm device according to an embodiment of the present invention; as shown in fig. 2, optionally, the housing 10 includes: the first shell 11 and the second shell 12 are screwed, and the first shell 11 and the second shell 12 are screwed.
The first casing 11 and the second casing 12 are screwed together, that is, the first casing 11 and the second casing 12 are detachable from each other, and after the first casing 11 and the second casing 12 are detached, devices inside the first casing 11 and the second casing 12 can be replaced or maintained.
Optionally, the materials of the first shell 11 and the second shell 12 are both polyethylene materials.
Alternatively, the specific heat capacity of the cooling layer 30 is much larger than that of the thermoelectric generation chip 40.
The specific heat capacity of the cooling layer 30 is generally much larger than that of the thermoelectric generation piece 40, i.e. to rise to the same temperature, the temperature rise time of the cooling layer 30 is much longer than that of the thermoelectric generation piece 40.
Optionally, the material of the thermal insulation layer 20 is asbestos cloth.
Optionally, the alarm device 60 comprises: at least one of the audible and visual alarm device 60, the audible alarm device 60 and the visual alarm device 60.
The alarm device 60 may be any one of the sound-light alarm device 60, the sound alarm device 60 and the light alarm device 60, or may be a plurality of combinations of the sound-light alarm device 60, the sound alarm device 60 and the light alarm device 60, and in practical application, the number of the alarm devices 60 is set according to actual needs, and is not specifically limited herein.
Optionally, the fire alarm device further includes a signal transmitting device 70, and the signal transmitting device 70 is disposed inside the housing 10 and electrically connected to the solar cell panel 50 and the thermoelectric generation chip 40, respectively.
The signal transmitting device 70 is disposed inside the housing 10, the solar cell panel 50 and the thermoelectric generation sheet 40 are electrically connected to the signal transmitting device 70, respectively, for providing electric energy to the signal transmitting device 70, when the electric energy generated by the thermoelectric generation sheet 40 is greater than the electric energy threshold of the signal transmitting device 70, the signal transmitting device 70 transmits an alarm signal to a remote terminal, so as to alarm the remote terminal.
Fig. 3 is a schematic structural view of another self-powered fire alarm device according to an embodiment of the present invention, and as shown in fig. 3, the fire alarm device may further include a thermal energy absorbing film, which is coated on an outer wall of the housing 10.
The heat energy absorbing film is coated on the outer wall of the shell 10 and used for absorbing heat energy when a fire disaster happens, so that the temperature of the shell 10 rises faster, namely the temperature difference between the two sides of the thermoelectric generation piece 40 is larger, the current is generated more rapidly, and the timeliness of alarming is improved.
The application provides a fire alarm device includes: the solar thermoelectric generation device comprises a shell 10, a heat insulation layer 20, a cooling layer 30, a thermoelectric generation sheet 40, a solar panel 50 and an alarm device 60; the inner wall of the shell 10 is provided with a heat insulation layer 20, one end of the shell 10 is provided with a hole, the hole and the heat insulation layer 20 form a groove, the groove is internally provided with a cooling layer 30, a thermoelectric generation sheet 40 and a solar cell panel 50 respectively, wherein the cooling layer 30 is filled in the groove, one side of the cooling layer 30, which is far away from the heat insulation layer 20, is provided with the thermoelectric generation sheet 40, one side of the thermoelectric generation sheet 40, which is far away from the heat insulation layer 20, is provided with the solar cell panel 50, an alarm device 60 is arranged in the shell 10 and is electrically connected with the thermoelectric generation sheet 40, one side of the thermoelectric generation sheet 40 is provided with the cooling layer 30, the other side is provided with the solar cell panel 50, when a fire disaster occurs around the fire alarm device, the temperature of the external environment is greatly changed, the temperature of one side, which is close to the solar cell panel 50, the two sides of the thermoelectric generation piece 40 can generate a large temperature difference, according to the thermoelectric generation principle, the thermoelectric generation piece 40 can generate current, and the alarm device 60 gives an alarm when the thermoelectric generation piece 40 generates current because the alarm device 60 is electrically connected with the thermoelectric generation piece 40; and this casing 10 inner wall's insulating layer 20 makes the inside and outside temperature of this casing 10 produce huge temperature difference, protect the inside alarm device 60 that sets up of casing 10, in addition, because the high specific heat capacity of cooling layer 30, make the upper and lower surface difference in temperature increase of thermoelectric generation piece 40, in earlier stage when the conflagration takes place, the volume that external temperature rises is less, cooling layer 30 is equivalent to the difference in temperature increase with thermoelectric generation piece 40 both sides, this fire alarm device has improved the sensitivity of this fire alarm device earlier stage in the conflagration emergence, and make the fire alarm device of this application carry out the alarm early warning in the conflagration emergence initial stage.
The application provides a fire alarm system from energy supply, fire alarm system includes: a signal receiving device, a processor and the fire alarm device of any one of the first aspect, the signal receiving device being electrically connected to the processor, the signal receiving device being adapted to receive an alarm signal generated by the fire alarm device 60.
The signal receiving device can receive the sound and light signals generated by the remote sound and light alarm device 60, sound alarm device 60 and light alarm device 60, and also can receive the signal transmitted by the signal transmitting device 70 and transmit the received signal to the processor, and the processor records the place and time of the fire and gives an alarm to provide the place and time of the fire to a fire alarm or a fire fighting team.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A self-powered fire alerting device, characterized in that the fire alerting device comprises: the solar thermoelectric generation device comprises a shell, a heat insulation layer, a cooling layer, a thermoelectric generation piece, a solar panel and an alarm device; the solar thermal power generation device comprises a shell, and is characterized in that the inner wall of the shell is provided with a heat insulation layer, one end of the shell is provided with a hole, the hole and the heat insulation layer form a groove, the inside of the groove is respectively provided with a cooling layer, a thermoelectric generation piece and a solar cell panel, wherein the cooling layer is filled in the groove, one side, away from the heat insulation layer, of the cooling layer is provided with the thermoelectric generation piece, the thermoelectric generation piece is away from one side, away from the heat insulation layer, of the heat insulation layer, the solar cell panel is arranged, an alarm device is arranged in the shell, and the alarm device is respectively electrically connected with the solar cell panel and the thermoelectric.
2. The self-powered fire alerting device of claim 1, wherein the housing comprises: the shell comprises a first shell and a second shell, wherein the first shell and the second shell are in threaded connection.
3. A self-powered fire alerting device as claimed in claim 2, wherein the first and second housings are both of polyethylene material.
4. The self-powered fire alarm device of claim 1, wherein the specific heat capacity of the cooling layer is much greater than the specific heat capacity of the thermoelectric generation chip.
5. The self-energized fire alarm device of claim 1, wherein the thermal insulation layer is made of asbestos cloth.
6. The self-powered fire alarm device of claim 1, wherein the alarm device comprises: at least one of an audible and visual alarm device, an audible alarm device and an optical alarm device.
7. The self-powered fire alarm device of claim 1, further comprising a signal emitting device disposed inside the housing and electrically connected to the thermoelectric generation chip.
8. The self-powered fire alarm device of claim 1, further comprising a thermal energy absorbing film coated on the outer wall of the housing.
9. A self-powered fire alerting system, characterized in that the fire alerting system comprises: a signal receiving device, a processor and a fire alarm device as claimed in any one of claims 1 to 8, wherein the signal receiving device is electrically connected with the processor and is used for receiving an alarm signal generated by the fire alarm device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010971592.7A CN111968333A (en) | 2020-09-16 | 2020-09-16 | Self-powered fire alarm device and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010971592.7A CN111968333A (en) | 2020-09-16 | 2020-09-16 | Self-powered fire alarm device and system |
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| CN111968333A true CN111968333A (en) | 2020-11-20 |
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| CN202010971592.7A Pending CN111968333A (en) | 2020-09-16 | 2020-09-16 | Self-powered fire alarm device and system |
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| CN (1) | CN111968333A (en) |
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| WO2021137239A1 (en) * | 2019-12-31 | 2021-07-08 | Honigsberg Doron | Fire alerting device and system |
| CN118629146A (en) * | 2024-08-08 | 2024-09-10 | 赛富能科技(深圳)有限公司 | Self-powered long-acting fire alarm device |
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