CN111292500B - Smoke-sensitive fire detection alarm - Google Patents
Smoke-sensitive fire detection alarm Download PDFInfo
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- CN111292500B CN111292500B CN201811497050.XA CN201811497050A CN111292500B CN 111292500 B CN111292500 B CN 111292500B CN 201811497050 A CN201811497050 A CN 201811497050A CN 111292500 B CN111292500 B CN 111292500B
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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
- G08B17/107—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 for detecting light-scattering due to smoke
Abstract
The utility model provides a smoke sensing fire detection alarm belongs to alarm technical field. The smoke fire detection alarm comprises a shell, a light emission component, a light detection component and a light barrier, wherein: the light emitting component and the light detecting component are both arranged on the shell; the light barrier is arranged in the shell and blocks a light path between the detection end of the optical detection component and the light emitting end of the light emitting component; the height of the light barrier is a preset value, and the preset value is determined based on the light intensity detected by the light detection component when no smoke exists and the light intensity which is detected by the light detection component when smoke exists and can trigger an alarm. By adopting the smoke detection alarm, the height of the light barrier is reduced, the area of the effective scattering area is increased, and the accuracy of smoke detection of the smoke detection alarm can be improved.
Description
Technical Field
The disclosure relates to the technical field of alarms, in particular to a smoke-sensing fire detection alarm.
Background
A smoke-sensitive fire detection alarm is generally installed on an indoor ceiling, and when smoke is generated due to indoor fire, the smoke rises and enters the smoke-sensitive fire detection alarm, so that the smoke-sensitive fire detection alarm can be triggered to send out an alarm.
The smoke-sensitive fire detection alarm generally comprises a shell, a light emission component and a light detection component, wherein the light emission component and the light detection component are both arranged in the shell, a diaphragm is arranged on the side wall of the shell, and an effective scattering area exists between the light emission component and the light detection component in the shell. Under the condition of no smoke, light emitted by the light emitting component cannot be detected by the light detecting component, and under the condition of smoke, light entering the effective scattering area can encounter smoke in the effective scattering area to scatter, and the scattered light can emit to the light detecting component and is detected by the light detecting component. The higher the concentration of smog, the higher the intensity of the light that light detection components and parts detected is, when the intensity of the light that light detection components and parts detected is greater than the predetermined threshold value, the smoke sensing fire detection alarm just can send the warning.
In implementing the present disclosure, the inventors found that the related art has at least the following problems:
after smoke enters the smoke-sensitive fire detection alarm, the smoke cannot enter an effective scattering area necessarily, the gathering effect of the smoke in the effective scattering area is poor, when a large amount of smoke enters the smoke-sensitive fire detection alarm, the smoke-sensitive fire detection alarm can send an alarm, and therefore the accuracy of detecting the smoke by the smoke-sensitive fire detection alarm is low.
Disclosure of Invention
The embodiment of the disclosure provides a smoke-sensing fire detection alarm to solve the problems of the related art. The technical scheme is as follows:
according to this embodiment, a smoke fire detection alarm is provided, smoke fire detection alarm includes casing, light emission components and parts, light detection components and parts and barn door, wherein:
the light emitting component and the light detecting component are both arranged on the shell;
the light barrier is arranged in the shell and blocks a light path between the detection end of the optical detection component and the light emitting end of the light emitting component;
the height of the light barrier is a preset value, and the preset value is determined based on the light intensity detected by the light detection component when no smoke exists and the light intensity which is detected by the light detection component when smoke exists and can trigger an alarm.
Optionally, the emission direction of the light-emitting component and the detection direction of the light-detecting component both face the inside of the housing, an overlapping region exists between the emission range of the light-emitting component and the detection range of the light-detecting component, and the overlapping region is an effective scattering region;
the smoke sensing fire detection alarm further comprises a plurality of light barriers for blocking ambient light, a smoke channel is formed between every two adjacent light barriers, and a channel opening of the smoke channel, which is located inside the shell, faces to the effective scattering area.
Optionally, the smoke passage is located at a central position of the passage opening in the shell towards the shell.
Optionally, the shape of the cross section of the diaphragm is herringbone;
the herringbone light fence comprises a first vertical plate and a second vertical plate, and the first vertical plate and the second vertical plate are fixed with each other;
a first side edge of the first vertical plate, which is far away from the fixed position, is positioned outside the shell, and a second side edge of the second vertical plate, which is far away from the fixed position, is positioned inside the shell;
and guide plates facing the effective scattering area are arranged on the second lateral edge of the second vertical plate, a guide groove is formed between every two adjacent guide plates, and the notch of each guide groove is a passage opening of the smoke passage.
Optionally, the cross section of the guide plate is arc-shaped.
Optionally, the housing includes a base and an upper cover, the diaphragm is disposed on the base, the base is provided with a first mounting box and a second mounting box, and the upper cover is mounted above the diaphragm;
a first mounting opening for mounting the light-emitting component is formed in the side wall, located on the outer surface of the shell, of the first mounting box;
and a second mounting port for mounting the optical detection component is arranged on the side wall of the outer surface of the shell of the second mounting box.
Optionally, a first baffle and a second baffle perpendicular to the upper cover are arranged on the surface of the upper cover inside the housing;
a first slot is formed in the position, corresponding to the first mounting opening, of the first mounting box, and a second slot is formed in the position, corresponding to the second mounting opening, of the second mounting box;
the first baffle is inserted into the first slot, the first baffle is positioned between the light-emitting component and the first mounting opening, the second baffle is inserted into the second slot, and the second baffle is positioned between the light-detecting component and the second mounting opening.
Optionally, a diffuse reflection layer is disposed on both the surface of the base located inside the housing and the surface of the upper cover located inside the housing.
Optionally, the light barrier includes a first light barrier and a second light barrier, the first light barrier blocks a light path between the detection end of the optical detection element and the light emitting end of the optical emission element, and the second light barrier blocks a light path between a lateral edge of the first light barrier and the detection end of the optical detection element.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
in the embodiment of this disclosure, this sense cigarette fire detection alarm includes casing, light emission components and parts, optical detection components and parts and barn door, wherein: the light emitting component and the light detecting component are both arranged on the shell; the light barrier is arranged in the shell and blocks a light path between the detection end of the optical detection component and the light emitting end of the light emitting component; the height of the light barrier is a preset value, and the preset value is determined based on the light intensity detected by the light detection component when no smoke exists and the light intensity which is detected by the light detection component when smoke exists and can trigger an alarm. Compared with the prior art, reduce the height of barn door, can increase the area of effective scattering region, like this, when effective scattering region's existence smog, the light intensity that the optical detection components and parts detected is higher, need not to wait to a large amount of smog and enters into smoke fire detection alarm, and smoke fire detection alarm just can send the warning, and then, can improve the degree of accuracy that smoke fire detection alarm detected smog.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural view of a smoke-sensitive fire detection alarm provided in an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a smoke sensing fire detection alarm provided by an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a smoke sensing fire detection alarm provided by an embodiment of the present disclosure;
FIG. 4 is a schematic view of an effective scattering area within a smoke fire detection alarm provided by an embodiment of the disclosure;
fig. 5 is a schematic structural diagram of a diaphragm provided in an embodiment of the disclosure
FIG. 6 is a schematic structural diagram of a light barrier of a smoke-sensing fire detection alarm provided by an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a smoke-sensing fire detection alarm provided by the embodiment of the disclosure.
Description of the figures
1. Casing 2, light emission component
3. Optical detection component 4 and light barrier
11. Diaphragm 12, smoke channel
13. Base 14, upper cover
15. First mounting box 16 and second mounting box
41. A first light shielding sub-plate 42 and a second light shielding sub-plate
111. A first vertical plate 112 and a second vertical plate
113. The connecting edge 114 and the first side edge
115. Second side edge 116, guide plate
121. Passage port 141, first baffle
142. Second baffle 151, first installing port
152. First slot 161 and second mounting port
162. Second slot A, effective scattering area
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
For the safety of people's lives and properties, smoke-sensitive fire detection alarms, that is, alarms that can issue an alarm when detecting that smoke concentration exceeds a preset threshold, are generally installed indoors. The smoke-sensitive fire detection alarm in the related art has at least the following problems:
firstly, after smoke enters the interior of the smoke-sensing fire detection alarm, the smoke does not necessarily enter the effective scattering area, so that the gathering effect of the smoke in the effective scattering area is poor, when a large amount of smoke enters the smoke-sensing fire detection alarm, the smoke-sensing fire detection alarm can send an alarm, and therefore, the accuracy of detecting the smoke by the smoke-sensing fire detection alarm is low.
Secondly, all be provided with the barn door that is used for blockking that the light transmission components and parts sent gets into the optical detection components and parts among the smoke sensing fire detection alarm among the correlation technique, and this barn door highly is higher, almost contacts with the lower surface of upper cover, and is thus visible, does not have the clearance between the top of barn door and the upper cover almost, and is corresponding, has reduced the area of effective scattering area among the smoke sensing fire detection alarm, also can further lead to smoke sensing fire detection alarm to detect the degree of accuracy of smog lower.
For solving the problem in the related art, this embodiment provides a smoke fire detection alarm, as shown in fig. 1, this smoke fire detection alarm includes casing 1, light emission component 2 and light detection component 3, wherein: the light emitting component 2 and the light detecting component 3 are both arranged on the shell 1; the emission direction of the light-emitting component 2 and the detection direction of the light-detecting component 3 both face the inside of the housing 1. As shown in fig. 2 and 3, a light-blocking panel 4 is provided inside the housing 1, and the light-blocking panel 4 blocks a light path between the detection end of the light detection component 3 and the light emission end of the light emission component 2.
The light emitting component 2 and the light detecting component 3 may be light emitting diodes, the light detecting component 3 may convert an optical signal corresponding to the received light into an electrical signal and transmit the electrical signal to the amplifier, and the amplifier transmits the amplified signal to the processor to perform subsequent operations.
In the implementation, the light path that the transmission end of light emission component part 2 sent is located the inside of casing 1, the light path that the detection end of light detection component part 3 detected is located the inside of casing 1, under the condition of no smog, light that light detection component part 2 emitted also can be detected to light detection component part 3, in order to avoid the appearance of this kind of condition, it is corresponding, be provided with barn door 4 in the inside of casing 1, barn door 4 blocks the light path between the detection end of light detection component part 3 and the luminous end of light emission component part 2, thus, under the condition of no smog, the in-process of the light propagation of light emission component part 2 transmission, most is sheltered from by barn door 4, and then, the light intensity that light detection component part 3 detected is relatively weak, can not produce the alert condition of wrong report.
The light barrier 4 is made of a light-tight material, the light barrier 4 is vertically erected between the light emission component 2 and the light detection component 3, the purpose of blocking the light detected by the light detection component 3 is achieved, and the thickness of the light barrier 4 is not limited, and the purpose of blocking the light from penetrating is achieved.
In implementation, there is an overlapping region between the emission range of the light-emitting component 2 and the detection range of the light-detecting component 3, and the overlapping region is an effective scattering region. The effective scattering region is a region where light rays inside the housing 1 are scattered when encountering smoke and can be reflected to the light detection element 3. Wherein, smog comprises a large amount of tiny smog particles, and when smog got into the inside of casing 1, the inside light of casing 1 all can meet smog and take place the scattering phenomenon, but the light through the scattering can not all be detected by light detection components and parts 3.
It can be seen that the effective scattering region needs to satisfy two conditions, one is where light exists, so the effective scattering region needs to be located in the emission range of the light-emitting device 2, and the other is where light can be detected by the light-detecting device 3 after being reflected by smoke, so the effective scattering region needs to be located in the detection range of the light-detecting device 3, so the effective scattering region falls in the overlapping region of the emission range of the light-emitting device 2 and the detection range of the light-detecting device 3, as shown in fig. 4, a is the effective scattering region shown in a in fig. 4, where fig. 4 is only a schematic diagram for illustrating the effective scattering region and does not form a specific limitation.
In application, if the area of the effective scattering area is larger, the smoke fire detection alarm device has higher accuracy in detecting smoke and higher detection speed, because once the area of the effective scattering area is increased, the smoke fire detection alarm device in the scheme firstly gives an alarm when the smoke concentration entering the shell 1 is equal, because the light intensity detected by the light detection component 3 is higher when the light flux of the scattered light is more under the condition of smoke.
The area of effective scattering region can be increased through the height that changes barn door 4, and it can be correspondingly, the height of barn door 4 is for predetermineeing the numerical value, and this predetermines the numerical value and is less than the distance between the upper surface of the bottom of casing 1 and the lower surface at the top of casing, and should predetermine the numerical value and confirm based on the light intensity that light detection components and parts 3 detected when having smog and the light intensity that can trigger the warning that light detection components and parts 3 detected when having smog, specifically can be as follows:
the size that the technical staff set up the firework warning to and all install and debug the inside spare part of casing 1 after, the technical staff can adjust the height of barn door 4, under the co-altitude, the light intensity that light detection components and parts 3 detected under the no smog condition of test, do not mark as normal light intensity, test light detection components and parts 3 received just can take place the light intensity of reporting to the police, do not mark as warning light intensity. The skilled person can determine the variation curve between the normal light intensity and the height of the light barrier 4 and the variation curve between the alarm light intensity and the height of the light barrier 4 according to the test. Then, the technician can determine the height value of the light barrier 4 corresponding to the large change in the alarm light intensity without changing the normal light intensity much as the height value of the light barrier 4.
Alternatively, the specific idea for the skilled person to determine the height of the light barrier 4 may also be:
the size that the technical staff set up fireworks and lanterns and report to the police to and all install and debug the inside spare part of casing 1 after, the technical staff can adjust the height of barn door 4, and under the smokeless fog circumstances, the height of barn door 4 can not trigger the smoke and fire detection alarm just and produce the warning. Or, under the condition of no smoke, the height of the light barrier 4 corresponds to the preset light intensity range detected by the optical detection component 3, and a technician can adjust the height of the light barrier 4 according to the preset light intensity range, wherein the preset light intensity range cannot trigger the smoke-sensing fire detection alarm to generate an alarm.
Based on the above, the height of the light barrier 4 is a preset value, and the preset value is smaller than the distance between the upper surface of the bottom of the housing 1 and the lower surface of the top of the housing, so that a gap exists between the light barrier 4 and the lower surface of the top of the housing 1. If the light is scattered in the gap, the scattered light can be detected by the optical detection component 3, so that the height of the light barrier 4 is reduced, and the area of an effective scattering area can be increased. Furthermore, when there is smoke in the effective scattering area, the more the luminous flux of the scattered light occurs, and further, the greater the intensity of the light detected by the light detection element 3, correspondingly, when there is smoke in the interior of the smoke fire detection alarm, the more easily the light detection element detects smoke, and further, the accuracy of the smoke fire detection alarm can be further improved.
It is to be noted that the height of the light barrier 4 and the dimensions of the smoke alarm, the distance between the upper surface of the bottom and the lower surface of the top of the housing 1, the dimensions of the structures inside the housing 1 adjacent to the light barrier 4, etc. are related. Therefore, the height of the light barrier 4 needs to be determined according to the light intensity detected by the light detection component 3 when no smoke exists and the light intensity which can trigger alarm and is detected by the light detection component 3 when smoke exists under the condition that the structures and the positions of all parts in the smoke-sensitive fire detection alarm, the structure and the position of the light barrier 4 and the like are standardized.
Optionally, in order to enable the smoke entering the inside of the housing 1 to enter the effective scattering area in the case of smoke, the smoke fire detection alarm may further include a plurality of diaphragms 11 blocking ambient light, a smoke passage 12 is formed between two adjacent diaphragms 11, and a passage opening 121 of the smoke passage 12 located inside the housing 1 faces the effective scattering area.
The light barriers 11 may also be referred to as light barriers, and are used to block light in an environment outside the housing 1 from entering the housing 1, so that the fire alarm generates a false alarm, and on the other hand, a smoke channel 12 is formed between two adjacent light barriers 11, so that smoke can enter the housing 1 through the smoke channel 12.
In practice, the passage openings 121 of the smoke passages 12 formed by two adjacent diaphragms 11 face the effective scattering area, so when smoke enters the interior of the housing 1 through the smoke passages 12, the smoke is finally discharged into the interior of the housing 1 from the passage openings 121, and flows to the effective scattering area under the drainage action of the passage openings 121. Furthermore, the smoke is gathered in the effective scattering area, and correspondingly, the light intensity detected by the light detection component 3 is higher, so that the accuracy and the rapidity of the smoke detection of the smoke sensing fire detection alarm can be improved.
Alternatively, in order to orient the passage opening 121 of the smoke passage 12 inside the housing 1 towards the effective scattering area, the passage opening, correspondingly, as shown in fig. 2, the cross-section of the light barrier 11 is shaped like a chevron, as shown in fig. 3, the chevron-shaped light barrier 11 includes a first riser 111 and a second riser 112, wherein the first riser 111 and the second riser 112 are fixed in a crossed manner, as shown in fig. 5, the first riser 111 and the second riser 112 are crossed to form a junction edge 113, a first side edge 114 of the first riser 111 parallel to the junction edge 113 is located on the outer surface of the casing 1, a second side edge 115 of the second riser 112 parallel to the junction edge 113 is located inside the casing 1, and the second side edge 115 of the second vertical plate 112 is provided with a guide plate 116 facing the effective scattering area, and a guide groove is formed between two adjacent guide plates 116, and the notch of the guide groove is the passage opening 121 of the smoke passage 12.
Wherein the cross section of the diaphragm 11 means a cross section along the thickness direction of the diaphragm 11.
In practice, two adjacent light barriers 11 form the smoke passage 12, the ends of the guide plates 116 of two adjacent second risers 112 form the passage openings 121 of the smoke passage 12, and the passage openings 121 of the smoke passage 12 formed by the ends of two adjacent guide plates 116 face the effective scattering area because the ends of the guide plates 116 face the effective scattering area.
In order to let all the scattered light enter the light detection component 3, the channel opening 121 of the smoke channel 12 may be correspondingly directed to the position of the strongest light intensity in the effective scattering area. Wherein the position with the strongest light intensity can be at any position of the housing 1, for example, the position with the strongest light intensity can be the central position inside the housing 1, and then the passage opening 121 of the smoke passage 12 can be towards the central position inside the housing 1. The specific position with the strongest light intensity is not limited in this embodiment, and a technician may determine the position according to the actual situation of the smoke-sensitive fire detection alarm, and the position with the strongest light intensity in this embodiment and the drawings may be exemplified by the central position inside the housing 1, and other situations are similar to them, and thus are not described again.
In practice, if the position with the highest light intensity is at the central position of the housing 1, accordingly, the ends of the guide plates 116 are all directed to the central position of the housing 1, and the passage openings 121 of the smoke passage 12 are directed to the central position of the interior of the housing 1, namely, the side edges of the guide plates 116 close to the central position of the housing 1.
Based on chevron structure's diaphragm 11, when smog passed through smoke channel 12 and got into the inside of casing 1, because the passway mouth 121 of smoke channel 12 all faces the inside central point department of casing 1, so just gather a large amount of smog at the inside central point department of casing 1, the light that enters into casing 1 inside all can enter into the inside central point department of casing 1 under the guide effect of diaphragm 11, and then can improve the gathering effect of smog at the inside effective scattering region of casing 1, and then, improve the degree of accuracy of smoke fire detection alarm.
Optionally, under the condition of no smoke, in order to avoid that the light emitted by the light emitting component 2 enters the light detecting component 3 through the reflection of the guide plate 116, correspondingly, the shape of the guide plate 116 may be made into an arc shape, that is, as shown in fig. 5, the shape of the cross section of the guide plate 116 is an arc shape, so that after the light emitted by the light emitting component 2 is emitted for multiple times through the arc-shaped guide plate 116, the intensity of the light may be reduced, even if the light after being reflected for multiple times enters the light detecting component 3, the intensity is weaker, and false alarm of the smoke-sensing fire detection alarm may not be caused.
It should be noted that the shape of the cross section of the guide plate 116 may also be other shapes, such as a semi-circle, and the like, which is not limited in this embodiment with respect to the shape of the cross section of the guide plate 116.
It can be seen that, in this embodiment, on one hand, the guiding function of the guiding plate 116 at the end of the second vertical plate 112 of the diaphragm 11 guides the smoke entering the inside of the housing 1 to the central position of the housing 1, so that the light detection component 3 can detect more light rays, and the intensity of the light rays detected by the light detection component 3 is enhanced. On the other hand, through reducing the height of barn door 4, make the space between barn door 4 and the surface at the top of casing 1 also form effective scattering region, and then, improved effective scattering region's area, like this for the light that light emission component part 2 transmitted takes place the scattering in more positions, as long as light takes place the scattering and just probably is detected by light detection component part 3, and then, also strengthens the intensity of the light that light detection component part 3 detected. Thus, under the condition of entering the smoke with the same quantity, the scheme has higher accuracy, is more sensitive and is quicker.
Optionally, as described above, if the light is scattered at the central position inside the housing 1, the probability that the scattered light is detected by the optical detection component 3 is higher, and more areas for scattering the light are vacated near the central position inside the housing 1 as much as possible, and accordingly, the light blocking end of the light blocking plate 4 cannot be located at the central position, that is, the light blocking plate 4, whose light blocking end is farthest from the central position, is the most ideal light blocking plate 4. In this case, diffraction may occur at the edge of the light-shielding end portion of the light-shielding plate 4, and the diffracted light may be detected by the light detection element 3. In order to solve the problem that the diffracted light is detected by the optical detection component 3, the following steps are correspondingly performed:
as shown in fig. 6 and with reference to fig. 2, the light barrier 4 includes a first light barrier 41 and a second light barrier 42, the first light barrier 41 blocks the light path between the detection end of the light detection component 3 and the light emission end of the light emission component 2, and the second light barrier 42 blocks the light path between the lateral edge of the first light barrier 41 and the detection end of the light detection component 3.
In implementation, as shown in fig. 2, the cross section of the light barrier 4 along the thickness direction is shaped like a wrench, and includes a first light barrier 41 and a second light barrier 42, where the first light barrier 41 blocks the light path between the detecting end of the light detecting component 3 and the light emitting end of the light emitting component 2 to block the light emitted by the light emitting component 2. The second light-blocking plate 42 blocks the light path between the lateral edge of the first light-blocking plate 41 and the detection end of the optical detection component 3, and is used for blocking the light diffracted by the edge of the first light-blocking plate 41. Thus, under the condition that the distance between the side edge of the first light barrier plate 41 close to the central position and the central position is large, the light detection component 3 can not detect light rays or the intensity of the detected light rays can be ignored under the condition of no smoke, and the distance between the side edge of the first light barrier plate 41 and the central position of the shell 1 can be large.
Like this, under the inside circumstances of casing 1 is got into to no smog, the light that light transmission component 2 sent can hardly be detected by light detection component 3, and then, can avoid feeling the condition of cigarette fire detection alarm false alarm.
Alternatively, as shown in fig. 1, the housing 1 of the smoke fire detection alarm may comprise a base 13 and an upper cover 14, wherein the diaphragm 11 is arranged on the base 13 and the upper cover 14 is positioned on the upper portion of the diaphragm 11.
Wherein, the upper cover 14, the base 13 and the diaphragm 11 between the upper cover 14 and the base 13 of the housing 1 enclose the inside of the housing 1.
In operation, as shown in fig. 4 and with reference to fig. 5, the diaphragm 11 is mounted on the base 13 of the housing 1 between the base 13 and the cover 14, the first riser 111 and the second riser 112 of the diaphragm 11 are perpendicular to the base 13 and the cover 14, the first riser 111 of the diaphragm 11 faces the exterior of the housing 1, and the second riser 112 faces the interior of the housing 1. The light emitting component 2 and the light detecting component 3 are mounted on the casing 1, for example, as shown in fig. 1, a first mounting box 15 and a second mounting box 16 may be disposed on the base 13 of the casing 1, a through hole is disposed on a side wall of the first mounting box 15 inside the casing 1, a through hole is disposed on a side wall of the second mounting box 16 inside the casing 1, the light emitting component 2 is mounted in the first mounting box 15 at a position corresponding to the through hole, and the light detecting component 3 is mounted in the second mounting box 16 at a position corresponding to the through hole.
Here, the first mounting box 15 and the second mounting box 16 may be located inside the housing 1, that is, may be located in a detection chamber enclosed by the diaphragm 11. As shown in fig. 1 and 2, the first mounting box 15 and the second mounting box 16 may also form a side wall of the housing 1 together with the plurality of diaphragms 11, that is, the plurality of diaphragms 11, the first mounting box 15 and the second mounting box 16 together enclose a detection chamber, and this structural arrangement obviously can save the arrangement space of the smoke-fire detection alarm, and is beneficial to miniaturization of smoke and fire alarm.
In the implementation, the first mounting box 15 is used for mounting the light emitting component 2 on the one hand, and is used for shielding the light emitted by the light emitting component 2 on the other hand, so the first mounting box 15 may have a box-shaped structure, and may also have a box-shaped structure, etc., and this embodiment does not limit this, and it is enough to realize the mounting of the light emitting component 2 and the light shielding effect. Similarly, the second mounting box 16 is used for installing the optical detection component 3 on the one hand, and on the other hand is used for avoiding under the smokeless condition, and light is detected by the optical detection component 3, so the second mounting box 16 can have a box-shaped structure, also can have a box-shaped structure, and can realize that the optical detection component 3 and the shading effect can be installed.
In implementation, a central angle formed by the intersection of the central axis of the first mounting box 15 and the central axis of the second mounting box 16 may be within a preset numerical range, for example, the central angle may be 120 degrees or 135 degrees. The central axis of the first mounting box 15 passes through the center of the through hole in the side wall of the first mounting box 15, and the central axis of the second mounting box 16 passes through the center of the through hole in the side wall of the second mounting box 16.
Alternatively, as shown in fig. 1 and 3, a first mounting opening 151 for mounting the light emitting component 2 is provided on a side wall of the first mounting box 15 on the outer surface of the housing 1; a second mounting opening 161 for mounting the light detection component 3 is provided in a side wall of the second mounting box 16 on the outer surface of the housing 1.
In practice, the technician may mount the light emitting component 2 in the first mounting box 15 through the first mounting opening 151, and the emitting end of the light emitting component 2 is aligned with the through hole on the side wall of the first mounting box 15 inside the housing 1. Also, the technician can mount the optical detection component 3 in the second mounting box 16 through the second mounting opening 161, and the detection end of the optical detection component 3 is aligned with the through hole on the side wall of the second mounting box 16 inside the housing 1. Since the first mounting box 15 and the second mounting box 16 are made of opaque materials, light emitted from the light emitting component 2 in the first mounting box 15 can be emitted to the inside of the housing 1 through the through hole in the first mounting box 15, and the light detecting component 3 in the second mounting box 16 can detect light inside the housing 1 through the through hole in the second mounting box 16.
Alternatively, in order to prevent the light emitting component 2 from being separated from the first mounting box 15 through the first mounting opening 151 and the light detecting component 3 from being separated from the second mounting box 16 through the second mounting opening 161, correspondingly, as shown in fig. 1, the surface of the upper cover 14 inside the housing 1 is provided with a first baffle plate 141 and a second baffle plate 142 perpendicular to the upper cover 14; as shown in fig. 1, a first slot 152 is provided at a position of the first mounting box 15 corresponding to the first mounting opening 151, and a second slot 162 is provided at a position of the second mounting box 16 corresponding to the second mounting opening 161; as shown in fig. 1, the first baffle 141 is inserted into the first insertion groove 152, the first baffle 142 is located between the light emitting device 2 and the first installation opening 151, the second baffle 142 is inserted into the second insertion groove 162, and the second baffle 142 is located between the light detecting device 3 and the second installation opening 161.
In practice, as shown in fig. 7, the first blocking plate 141 is inserted into the first slot 152 to block the first mounting opening 151 of the first mounting box 15, so as to limit the light-emitting component 2 and prevent it from coming out of the first mounting box 15. Similarly, the second blocking plate 142 is inserted into the second slot 162 to block the second mounting opening 161 of the second mounting box 16 and prevent the second blocking plate from being removed from the second mounting box 16. Moreover, the first baffle 141 is inserted in the first slot 152, and the second baffle 142 is inserted in the second slot 162, so that dust and the like in the environment can be prevented from entering the inside of the housing 1 through the first mounting port 151 and the second mounting port 161, and light in the environment can be prevented from entering the second mounting box 16 through the second mounting port 161 to affect the detection of the light detection component 16.
Optionally, the thickness of the portions of the first and second baffles 141 and 142 close to the upper cover 14 is greater than that of the portions far from the upper cover 14, the thickness of the portions of the first baffle 141 close to the upper cover 14 is greater than the width of the notches of the first slots 152, and the thickness of the portions of the second baffle 142 close to the upper cover 14 is greater than the width of the notches of the second slots 162.
In practice, as shown in fig. 7, the thickness of the first baffle 141 gradually increases from the end close to the upper cover 14 to the end far from the upper cover 14, and likewise, the thickness of the second baffle 142 gradually increases from the end close to the upper cover 14 to the end far from the upper cover 14 (not shown in the figure, refer to fig. 7). Thus, the first baffle 141 can be inserted into the first slot 152 by interference, and the second baffle 142 can be inserted into the second slot 162 by interference. Further, the first baffle 141 is interference-mounted in the first slot 152, and the second baffle 142 is interference-mounted in the second slot 162, so that the upper cover 14 is fixed to the first mounting box 15 and the second mounting box 16, respectively, and further, the upper cover 14 is mounted above the diaphragm 11.
Of course, the upper cover 14 may be mounted above the diaphragm 11 by other methods, for example, the upper cover 14 may be fixed on the upper portion of the diaphragm 11 by gluing, for example, the diaphragm 11 has a certain thickness, so the upper cover 14 may be mounted on the upper portion of the diaphragm 11 by screws, and the connection method between the upper cover 14 and the diaphragm 11 is not limited in this embodiment, and the upper cover 14 may be fixed above the diaphragm 11.
Alternatively, in order to prevent the light emitted from the light-emitting device 2 from entering the light-detecting device 3 after being reflected by the surface of the base 13 or the surface of the upper cover 14 under the condition that no smoke enters the inside of the housing 1, a diffuse reflection layer is correspondingly disposed on the surface of the base 13 inside the housing 1 and the surface of the upper cover 14 inside the housing 1.
In practice, a diffuse reflection layer is a surface layer that diffusely reflects light. The diffuse reflective layer may be an uneven surface layer, for example, the surface of the base 13 and the upper cover is provided with ripples, a plurality of protrusions, a plurality of grooves, etc. Thus, after the light emitted from the light emitting element 2 is emitted to the diffuse reflection layer of the base 13 or the diffuse reflection layer of the upper cover 14, the intensity of the light becomes weak after multiple reflections, and even if a part of the light enters the light detecting element 3, the intensity is small, and the smoke-sensitive fire detecting alarm is not triggered to give an alarm.
In the embodiment of this disclosure, this sense cigarette fire detection alarm includes casing, light emission components and parts, optical detection components and parts and barn door, wherein: the light emitting component and the light detecting component are both arranged on the shell; the light barrier is arranged in the shell and blocks a light path between the detection end of the optical detection component and the light emitting end of the light emitting component; the height of the light barrier is a preset value, and the preset value is determined based on the light intensity detected by the light detection component when no smoke exists and the light intensity which is detected by the light detection component when smoke exists and can trigger an alarm. Compared with the prior art, reduce the height of barn door, can increase the area of effective scattering region, like this, when effective scattering region's existence smog, the light intensity that the optical detection components and parts detected is higher, need not to wait to a large amount of smog and enters into smoke fire detection alarm, and smoke fire detection alarm just can send the warning, and then, can improve the degree of accuracy that smoke fire detection alarm detected smog.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a smoke fire detection alarm, its characterized in that, smoke fire detection alarm includes casing, light emission components and parts, light detection components and parts and barn door, wherein:
the light emitting component and the light detecting component are both arranged on the shell;
the light barrier is arranged in the shell and blocks a light path between the detection end of the optical detection component and the light emitting end of the light emitting component;
the height of the light barrier is a preset value, and the preset value is determined based on the light intensity detected by the light detection component when no smoke exists and the light intensity which is detected by the light detection component when smoke exists and can trigger an alarm.
2. The smoke-sensing fire detection alarm device according to claim 1, wherein the emission direction of the light-emitting element and the detection direction of the light-detecting element both face the inside of the housing, an overlapping region exists between the emission range of the light-emitting element and the detection range of the light-detecting element, and the overlapping region is an effective scattering region;
the smoke sensing fire detection alarm further comprises a plurality of light barriers for blocking ambient light, a smoke channel is formed between every two adjacent light barriers, and a channel opening of the smoke channel, which is located inside the shell, faces to the effective scattering area.
3. The smoke-sensitive fire detection alarm of claim 2, wherein the smoke passage is located at a central position within the housing with the passage opening facing the interior of the housing.
4. The smoke-sensitive fire detection alarm of claim 2, wherein the cross-section of the diaphragm is herringbone in shape;
the herringbone light fence comprises a first vertical plate and a second vertical plate, and the first vertical plate and the second vertical plate are fixed with each other;
a first side edge of the first vertical plate, which is far away from the fixed position, is positioned outside the shell, and a second side edge of the second vertical plate, which is far away from the fixed position, is positioned inside the shell;
and guide plates facing the effective scattering area are arranged on the second lateral edge of the second vertical plate, a guide groove is formed between every two adjacent guide plates, and the notch of each guide groove is a passage opening of the smoke passage.
5. The smoke-sensitive fire detection alarm of claim 4, wherein the cross-section of the guide plate is arcuate in shape.
6. The smoke-sensing fire detection alarm of claim 2, wherein the housing comprises a base and an upper cover, the diaphragm is disposed on the base, the base is provided with a first mounting box and a second mounting box, and the upper cover is mounted above the diaphragm;
a first mounting opening for mounting the light-emitting component is formed in the side wall, located on the outer surface of the shell, of the first mounting box;
and a second mounting port for mounting the optical detection component is arranged on the side wall of the outer surface of the shell of the second mounting box.
7. The smoke-sensing fire detection alarm of claim 6, wherein a first baffle and a second baffle perpendicular to the upper cover are arranged on the surface of the upper cover inside the housing;
a first slot is formed in the position, corresponding to the first mounting opening, of the first mounting box, and a second slot is formed in the position, corresponding to the second mounting opening, of the second mounting box;
the first baffle is inserted into the first slot, the first baffle is positioned between the light-emitting component and the first mounting opening, the second baffle is inserted into the second slot, and the second baffle is positioned between the light-detecting component and the second mounting opening.
8. The smoke-sensitive fire detection alarm of claim 6, wherein a diffuse reflective layer is provided on both the surface of the base inside the housing and the surface of the upper cover inside the housing.
9. The smoke-sensing fire detection alarm according to any one of claims 1 to 8, wherein the light barrier comprises a first light barrier and a second light barrier, the first light barrier blocking a light path between the detection end of the optical detection element and the light emission end of the light emission element, and the second light barrier blocking a light path between a lateral edge of the first light barrier and the detection end of the optical detection element.
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| CN201811497050.XA CN111292500B (en) | 2018-12-07 | 2018-12-07 | Smoke-sensitive fire detection alarm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811497050.XA CN111292500B (en) | 2018-12-07 | 2018-12-07 | Smoke-sensitive fire detection alarm |
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| CN111292500B true CN111292500B (en) | 2022-02-08 |
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| CN111707643A (en) * | 2020-07-20 | 2020-09-25 | 九江珀伽索斯科技有限公司 | Optical darkroom assembly for photoelectric smoke-sensing fire detector |
| CN112017389B (en) * | 2020-09-14 | 2022-08-09 | 杭州海康消防科技有限公司 | Fire detector and fire detection method |
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| CN111292500A (en) | 2020-06-16 |
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