CN112037463A - High-sensitivity smoke alarm - Google Patents
High-sensitivity smoke alarm Download PDFInfo
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- CN112037463A CN112037463A CN202010951078.7A CN202010951078A CN112037463A CN 112037463 A CN112037463 A CN 112037463A CN 202010951078 A CN202010951078 A CN 202010951078A CN 112037463 A CN112037463 A CN 112037463A
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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
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
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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
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
The invention relates to the technical field of fire-fighting equipment and discloses a high-sensitivity smoke alarm which comprises a shell, wherein a top cover is fixedly installed at the top of the shell, a light emitting source is fixedly installed at the bottom of the top cover, an air inlet hole is formed in the outer surface of the shell, a light shading device is fixedly installed at the position of one end of the air inlet hole, and the included angle between a shutter light shading sheet and a base is forty-five degrees. Make light be located the inlet port top and just can pass the shade and enter into the A region in the picture on being close parallel position with the tripe anti-dazzling screen, because smoke alarm generally installs at the top, in use hardly appears the light that can be located the inlet port top, make it can shield most light, the interference of external light to the device has been avoided, the stability of the device work has been improved, thereby also avoided the structure bending of anti-dazzling screen among the traditional smoke alarm more to cause external smog difficult so that enter into smoke alarm inside thereby lead to insensitive problem.
Description
Technical Field
The invention relates to the technical field of fire-fighting equipment, in particular to a high-sensitivity smoke alarm.
Background
The smoke alarm is a very common fire-fighting equipment, various buildings such as houses, markets and office buildings have the shadow, the smoke alarm is the most important ring in a fire-fighting system and is responsible for finding out fire in time, the smoke alarm of the mainstream at present can be divided into an ionic type and a photoelectric type, the basic principle is basically the same, a stable ionization field or illumination is formed in the smoke alarm, when a fire occurs, the generated smoke enters the interior through the upper hole of the smoke alarm, the stable ionization field or illumination is influenced, the damage device is balanced, an induction device is excited and an alarm is given, the fire can be found out in time, the smoke alarm is directly networked with a fire-fighting office usually, and once the alarm occurs, the alarm can be directly and automatically given.
However, in the environment where the smoke alarm is located, there are many floating dusts, for example, in places where there are many floating dusts in the environment of a flour mill, and these floating dusts may also enter the interior of the smoke alarm through the holes, thereby affecting the ionization field or the illumination balance, thereby causing false triggering, which makes the smoke alarm need to set a triggering threshold value when installed, if the threshold value is set too high, triggering will cause too large area of fire and cause great loss when it is easy to cause fire, if the threshold value is set too low, it is easy to cause false alarm, and there is a difference with the setting of different threshold values of the environment, which makes the setting of the threshold value very difficult, in addition, in order to ensure that the smoke alarm is not interfered by external light, more L-shaped light-shielding strips are installed at the holes, which makes the whole structure more complicated, and increases the manufacturing cost, for this, the present document proposes a high-sensitivity smoke alarm, aiming at solving the above-mentioned problems.
Disclosure of Invention
Aiming at the defects of the existing smoke alarm provided in the background technology in the using process, the invention provides the high-sensitivity smoke alarm which has the advantage of no need of adjusting the threshold value and solves the problem of difficult setting of the threshold value of the traditional smoke alarm.
The invention provides the following technical scheme: a high-sensitivity smoke alarm comprises a shell, a top cover is fixedly mounted at the top of the shell, a light emitting source is fixedly mounted at the central position of the bottom of the top cover, air inlet holes are formed in the outer surface of the shell, the number of the air inlet holes is four, a shading device is fixedly mounted at the position, located at one end of each air inlet hole, of the inner wall of the shell, a base is fixedly mounted at the bottom of the shell, a partition device is fixedly mounted at the central position of the top of the base and comprises a cross partition plate, a blocking plate is fixedly mounted at the outer surface of the cross partition plate, the number of the blocking plates is four, one end of the blocking plate is connected with the end face of the cross partition plate, the other end of the blocking plate is in contact with the inner wall of the shell, an air vent is formed in one side of, the inside fixed mounting that is close to one end of baffler has the refractor on the position, the inside fixed mounting that is located the position of the other end of baffler has detection device.
Preferably, detection device includes the base, the both sides of base and baffler contact and the back of base and the inner wall of shell laminate mutually, the positive fixed mounting of base has the sensitization board, fixed mounting has the pipe of blocking on the position that the front of base is located sensitization board outside four corners, the one end fixed mounting that blocks the pipe has the board of rectifying, the position that rectangular hole and this rectangular hole were seted up to one side of board of rectifying is drunk relatively with the sensitization board, fixed mounting has fixed strip I on the position that the front of base is close to the outside, the one end fixed mounting of fixed strip I has the thermoplastic film, the thermoplastic film cup joints with the stationary blade is fixed, the one end fixed mounting of thermoplastic film has fixed strip II, II surfaces of fixed strip and baffler fixed connection and position are located one side of board of rectifying.
Preferably, the top of the cross-shaped partition board is in contact with the light emitting source, and the center line of the cross-shaped partition board and the axis of the light emitting source are located on the same straight line.
Preferably, the thermoplastic film is made of thermoplastic plastics which shrink under heat.
Preferably, the shading device comprises two fixing plates, the fixing plates are fixedly arranged on two sides of the air inlet hole, one side of each fixing plate is fixedly provided with a louver shading sheet, and an included angle between each louver shading sheet and the base is forty-five degrees.
Preferably, the included angle between the refractor and the base is forty-five degrees.
The invention has the following beneficial effects:
1. the invention makes the top of the cross-shaped partition plate contact with the luminous source and the central line of the cross-shaped partition plate and the axis of the luminous source are positioned on the same straight line, so that the cross-shaped partition plate divides the light emitted by the luminous source into four lights with the same intensity and directly irradiates on the refractor, the light emitted by the luminous source irradiates on the photosensitive plate through the refraction of the refractor by the included angle of forty-five degrees between the refractor and the base, four groups of detection devices can be activated by a single light source, the complexity of the whole structure of the device is reduced, the outer surface of the cross-shaped partition plate is fixedly provided with the blocking plates, the number of the blocking plates is four, the inner cavity of the shell is divided into four B areas under the blocking of the blocking plates, each B area is provided with the detection device, when a fire disaster happens, a local high-temperature air flow can be formed at an ignition point and the smoke dust is driven to move upwards, until the device is contacted with a ceiling to transversely flow, the outer surface of the shell is provided with four air inlet holes, so that transverse air flows enter the area A through the air inlet holes facing to the air flow direction and enter the area B through the air vent, the light intensity received by the photosensitive plates in the area B is influenced, the light intensity received by the photosensitive plates is different, the sensing device is excited to give an alarm, the device identifies whether a large amount of smoke exists or not through the difference between the light intensities received by the photosensitive plates, the influence of the environment where the device is located on the detection device in each area B is the same under normal state, the device does not need to set a threshold value before installation and use, and the problem that the excessive fire area is too large and large loss is caused due to late triggering when the threshold value is set to be too high and easily cause fire is avoided, the threshold value is set to be too low, which easily causes the condition of false alarm, thereby improving the practicability of the device.
2. The invention is characterized in that a light shading device is fixedly arranged at one end of the air inlet hole, and the included angle between the louver light shading sheet and the base is forty-five degrees, so that light rays can pass through the light shading device and enter the area A in the figure only when being positioned above the air inlet hole and positioned close to and parallel to the louver light shading sheet, because the smoke alarm is generally arranged at the top, the light rays which can be positioned above the air inlet hole are difficult to appear in use, the smoke alarm can shield most of the light rays, the interference of external light rays to the device is avoided, the working stability of the device is improved, meanwhile, the problem that the external smoke is difficult to enter the smoke alarm to cause insensitivity due to more bent structures of the louver light in the traditional smoke alarm is also avoided, meanwhile, a partitioning device is fixedly arranged at the center position of the top of the base, and the partitioning device divides the inner space of the shell into the area A and, the main detection equipment is installed in the area B, no part is arranged in the area A, and the area B is communicated with the area A only through the vent hole formed in one side of the blocking plate, so that the difficulty of light scattered in the area A entering the area B through the vent hole is further increased, and the working stability of the device is further improved.
3. According to the invention, the thermoplastic film is made of thermoplastic plastics which can shrink when heated, when smoke dust is carried by heat convection formed by a fire to enter the thermoplastic film through the air inlet hole and the air vent hole, the temperature in the thermoplastic film is raised and the thermoplastic film shrinks, so that the volume in the thermoplastic film is reduced, the concentration of smoke in the thermoplastic film is increased, the shielding effect of the smoke on light in the transmission process is improved, the illumination intensity on the light-sensitive plate is further reduced, namely the difference generated among all detection devices is more obvious, the device is more sensitive to the fire, meanwhile, the device can find and timely trigger an alarm when the fire is initially formed, and the applicability of the device is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic front view of the structure of the present invention;
FIG. 3 is a schematic sectional front view of the structure of the present invention;
FIG. 4 is a schematic view of the internal structure of the present invention;
FIG. 5 is a schematic view of the distribution of the internal regions of the structure of the present invention;
FIG. 6 is a schematic view of a structural inspection apparatus according to the present invention;
FIG. 7 is a cross-sectional view of a structure detecting device according to the present invention.
In the figure: 1. a housing; 2. a top cover; 3. a light emitting source; 4. an air inlet; 5. a light shielding device; 51. a fixing plate; 52. a louver blade; 6. a base; 7. a partitioning means; 71. a cross-shaped partition plate; 72. a barrier plate; 73. a vent hole; 74. a fixing sheet; 8. a refractor; 9. a detection device; 91. a base; 92. a light-sensing plate; 93. a blocking pipe; 94. a light-adjusting plate; 95. a fixing strip I; 96. a thermoplastic film; 97. and a fixing strip II.
Detailed Description
The technical solutions in 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 embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1-7, a high sensitivity smoke alarm includes a housing 1, and is characterized in that: the top of the shell 1 is fixedly provided with a top cover 2, the central position of the bottom of the top cover 2 is fixedly provided with a luminous source 3, the outer surface of the shell 1 is provided with air inlet holes 4, the number of the air inlet holes 4 is four, the position of the inner wall of the shell 1, which is positioned at one end of the air inlet hole 4, is fixedly provided with a light shading device 5, the light shading device 5 comprises a fixing plate 51, the number of the fixing plate 51 is two, the fixing plate 51 is fixedly arranged at two sides of the air inlet holes 4, one side of the fixing plate 51 is fixedly provided with a louver shading sheet 52, the included angle between the louver shading sheet 52 and the base 6 is forty-five degrees, the bottom of the shell 1 is fixedly provided with a base 6, the central position of the top of the base 6 is fixedly provided with a partitioning device 7, the partitioning device 7 comprises a cross-shaped, the outer surface of the cross partition plate 71 is fixedly provided with four partition plates 72, one end of each partition plate 72 is connected with the end surface of the cross partition plate 71, the other end of each partition plate 72 is in contact with the inner wall of the shell 1, one side of each partition plate 72 is provided with a vent hole 73, one end of each vent hole 73 is fixedly provided with a fixing piece 74, a refractor 8 is fixedly arranged at a position close to one end inside each partition plate 72, an included angle between each refractor 8 and the base 6 is forty-five degrees, a detection device 9 is fixedly arranged at a position at the other end inside each partition plate 72, each detection device 9 comprises a base 91, two sides of each base 91 are in contact with the corresponding partition plate 72, the back of each base 91 is attached to the inner wall of the shell 1, the front of each base 91 is fixedly provided with a light-sensing plate 92, and blocking pipes 93 are fixedly arranged at positions, which are positioned at, one end fixed mounting that stops pipe 93 has light adjusting plate 94, the position that rectangular hole and this rectangular hole were seted up to one side of light adjusting plate 94 is drunk relatively with sensitization board 92, fixed mounting has fixed strip I95 on the position that the front of base 91 is close to the outside, the one end fixed mounting of fixed strip I95 has thermoplastic film 96, thermoplastic film 96 material is for meeting the thermoplastic of thermal contraction, thermoplastic film 96 and stationary blade 74 are fixed to be cup jointed, thermoplastic film 96's one end fixed mounting has fixed strip II 97, fixed strip II 97 surface and baffler 72 fixed connection and position are located one side of light adjusting plate 94.
Wherein, the position of one end of the air inlet hole 4 is fixedly provided with the shading device 5, and the included angle between the louver shading sheet 52 and the base 6 is forty-five degrees, so that light rays can pass through the shading device 5 and enter the area A in the figure 5 when being positioned above the air inlet hole 4 and positioned close to and parallel to the louver shading sheet 52, because the smoke alarm is generally arranged at the top, the light rays which can be positioned above the air inlet hole 4 are difficult to appear in use, the smoke alarm can shield most of the light rays, the interference of external light rays to the device is avoided, the working stability of the device is improved, meanwhile, the problem that the external smoke is difficult to enter the smoke alarm to cause insensitive triggering due to more bent structures of the louver in the traditional smoke alarm is also avoided, meanwhile, the central position at the top of the base 6 is fixedly provided with the partition device 7, and the inner space of the housing 1 is divided into an area a and an area B in fig. 5 by the partitioning device 7, as the area B is provided with main detection equipment and has no parts, and the area B is communicated with the area a only through one side of the barrier plate 72 provided with the vent hole 73, the difficulty that the light scattered in the area a enters the area B through the vent hole 73 is further increased, and the working stability of the device is further improved.
Wherein, the cross partition plate 71 is cross-shaped, the top of the cross partition plate 71 is in contact with the light source 3, the central line of the cross partition plate 71 and the axis of the light source 3 are positioned on the same straight line, so that the cross partition plate 71 divides the light emitted by the light source 3 into four lights with the same intensity and directly irradiates on the refractor 8, the included angle between the refractor 8 and the base 6 is forty-five degrees, so that the light emitted by the light source 3 irradiates on the light-sensitive plate 92 through the refraction of the refractor 8, four groups of detection devices 9 can be activated through a single light source, the complexity of the whole structure of the device is reduced, the blocking plates 72 are fixedly arranged on the outer surface of the cross partition plate 71, the number of the blocking plates 72 is four, so that the inner cavity of the shell 1 is divided into four B areas under the blocking of the blocking plates 72 and each B area is provided with detection equipment, when a fire disaster occurs, a local high-temperature airflow is formed at an ignition point and drives smoke dust to move upwards until the smoke dust is contacted with a ceiling so as to flow transversely, at the moment, the outer surface of the shell 1 is provided with the air inlet holes 4, the number of the air inlet holes 4 is four, transverse airflow enters the area A through the air inlet holes 4 facing to the airflow direction and enters the area B through the air vent 73, the intensity of light rays received by the light sensing plates 92 in the area B is influenced, the illumination intensity received among the light sensing plates 92 is different, the sensing device is excited and gives an alarm, the device identifies whether a large amount of smoke exists or not through the difference among the illumination intensity received by each light sensing plate 92, and the influence of the environment where the device is located on the detection device in each area B is the same under a normal state, make the device need not set for the threshold value before the installation is used to trigger later and cause the too big and great loss of area of excessive fire that causes when avoiding the threshold value to set for too high easily resulting in the conflagration, the threshold value sets for the condition that excessively hangs down easily to lead to the false positive, thereby has improved the device's practicality.
Wherein, be for the thermoplastic who meets heat shrink through thermoplastic film 96 material, after the heat convection who fires the stroke carries the smoke and dust to enter into thermoplastic film 96 through inlet port 4 and vent 73, make the temperature rise in thermoplastic film 96 and make thermoplastic film 96 take place the shrink, thereby make the volume in thermoplastic film 96 diminish and lead to the concentration of inside smog to rise, thereby make light receive the in-process of propagating and shelter from the effect improvement of smog, can let the illumination intensity on the sensitization board 92 further descend and be the difference that produces between each detection device more obvious, thereby make the device more sensitive to the perception of conflagration, the device that also is simultaneously can just discover and in time trigger the warning when conflagration tentatively forms, the device applicability has been improved.
The using method of the invention is as follows:
during the installation, smoke alarm generally installs at the top, and the light that can be located inlet port 4 top hardly appears in use makes shade 5 can shield most light to simple structure itself is inside air current and the more convenient entering of smoke and dust of external world.
When in use, the cross partition plate 71 divides the light emitted by the light source 3 into four lights with the same intensity and directly irradiates the refractor 8, the included angle between the refractor 8 and the base 6 is forty-five degrees, so that the light emitted by the light source 3 irradiates the light-sensitive plate 92 through the refraction of the refractor 8, when a fire occurs, a local high-temperature airflow is formed at an ignition point and drives smoke dust to move upwards until the ignition point is contacted with a ceiling so as to transversely flow, the transverse airflow enters the area A through the air inlet hole 4 facing to the airflow direction and enters the area B through the air vent 73, further the intensity of the light received by the light-sensitive plate 92 in the area B is influenced, the difference of the illumination intensity received between the light-sensitive plates 92 is generated so as to excite the sensing device and give an alarm, and meanwhile, after the heat convection generated by the fire carries the smoke dust to enter the thermoplastic film 96 through the air inlet hole 4 and the air vent, the temperature in the thermoplastic film 96 is increased and the thermoplastic film 96 is shrunk so that the volume in the thermoplastic film 96 becomes smaller to cause the concentration of the internal smoke to rise, thereby improving the shielding effect of the smoke to the light during the propagation.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A high sensitivity smoke alarm comprising a housing (1), characterized in that: the top of the shell (1) is fixedly provided with a top cover (2), the central position of the bottom of the top cover (2) is fixedly provided with a luminous source (3), the outer surface of the shell (1) is provided with four air inlet holes (4) and the number of the air inlet holes (4) is four, the inner wall of the shell (1) is positioned at one end of the air inlet holes (4) and is fixedly provided with a shading device (5), the bottom of the shell (1) is fixedly provided with a base (6), the central position of the top of the base (6) is fixedly provided with a partition device (7), the partition device (7) comprises a cross partition plate (71), the outer surface of the cross partition plate (71) is fixedly provided with four partition plates (72) and the number of the partition plates (72) is four, one end of each partition plate (72) is connected with the end face of the cross partition plate (71), and the other end of each partition plate (72) is contacted with the inner wall, air vent (73) have been seted up to one side of baffler board (72), the one end fixed mounting of air vent (73) has stationary blade (74), fixed mounting has refractor (8) on baffler board (72) inside position that is close to one end, fixed mounting has detection device (9) on baffler board (72) inside position that is located the other end.
2. A high sensitivity smoke alarm according to claim 1 wherein: the detection device (9) comprises a base (91), the two sides of the base (91) are in contact with a blocking plate (72), the back of the base (91) is attached to the inner wall of the shell (1), a light sensing plate (92) is fixedly mounted on the front of the base (91), a blocking pipe (93) is fixedly mounted on the position, located at the four corners of the outer side of the light sensing plate (92), of the front of the base (91), a light adjusting plate (94) is fixedly mounted at one end of the blocking pipe (93), a rectangular hole is formed in one side of the light adjusting plate (94), the position of the rectangular hole is relatively drunk by the light sensing plate (92), a fixing strip I (95) is fixedly mounted on the position, close to the outer side, of the front of the base (91), a thermoplastic film (96) is fixedly mounted at one end of the fixing strip I (95), the thermoplastic film (96) is fixedly sleeved with a fixing sheet (74), and a fixing strip II (97) is fixedly mounted at one end of the, the outer surface of the fixing strip II (97) is fixedly connected with the blocking plate (72) and is positioned on one side of the light-rectifying plate (94).
3. A high sensitivity smoke alarm according to claim 2 wherein: the top of the cross partition plate (71) is in contact with the light-emitting source (3) and the central line of the cross partition plate (71) and the axis of the light-emitting source (3) are positioned on the same straight line.
4. A high sensitivity smoke alarm according to claim 2 wherein: the material of the thermoplastic film (96) is thermoplastic plastic which shrinks when being heated.
5. A high sensitivity smoke alarm according to claim 1 wherein: the shading device (5) comprises two fixing plates (51), the number of the fixing plates (51) is two, the fixing plates are fixedly installed on two sides of the air inlet holes (4), one side of each fixing plate (51) is fixedly provided with a louver shading sheet (52), and an included angle between each louver shading sheet (52) and the base (6) is forty-five degrees.
6. A high sensitivity smoke alarm according to claim 1 wherein: the included angle between the refractor (8) and the base (6) is forty-five degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010951078.7A CN112037463A (en) | 2020-09-11 | 2020-09-11 | High-sensitivity smoke alarm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010951078.7A CN112037463A (en) | 2020-09-11 | 2020-09-11 | High-sensitivity smoke alarm |
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| CN112037463A true CN112037463A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010951078.7A Pending CN112037463A (en) | 2020-09-11 | 2020-09-11 | High-sensitivity smoke alarm |
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| CN (1) | CN112037463A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114550404A (en) * | 2022-04-22 | 2022-05-27 | 江苏河马自动化设备有限公司 | Smoke alarm for fire control |
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| US6479833B1 (en) * | 1998-03-07 | 2002-11-12 | Robert Bosch Gmbh | Fire alarm box with direct and scattered light detection and gas-sensitive layers |
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| CN110132813A (en) * | 2019-06-17 | 2019-08-16 | 北京精英系统科技有限公司 | The method and apparatus of particle concentration in a kind of measurement air |
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| US4017193A (en) * | 1976-03-02 | 1977-04-12 | Leo Loiterman | Apparatus for measuring the transmittance or opacity of a gaseous medium carrying particulate matter through a conduit |
| EP0813178A1 (en) * | 1996-06-13 | 1997-12-17 | Cerberus Ag | Optical smoke detector |
| US6479833B1 (en) * | 1998-03-07 | 2002-11-12 | Robert Bosch Gmbh | Fire alarm box with direct and scattered light detection and gas-sensitive layers |
| CN1248034A (en) * | 1998-09-14 | 2000-03-22 | 西门子建筑技术公司 | Optical smoke gas alarm operated by extinction principle and temp. drift method for compensating the alarm |
| JP5415331B2 (en) * | 2010-03-17 | 2014-02-12 | 能美防災株式会社 | Dimmable smoke detector |
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| CN207752606U (en) * | 2018-01-05 | 2018-08-21 | 张泽 | A kind of chamber structure of family fire photoelectric smoke detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114550404A (en) * | 2022-04-22 | 2022-05-27 | 江苏河马自动化设备有限公司 | Smoke alarm for fire control |
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