CN210574186U

CN210574186U - Photoelectric smoke-sensing fire alarm optical labyrinth

Info

Publication number: CN210574186U
Application number: CN201922077922.3U
Authority: CN
Inventors: 吴雪丹
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-05-19
Anticipated expiration: 2029-11-27

Abstract

The utility model belongs to the technical field of the fire detection warning, concretely relates to can be applied to photoelectric type smoke fire alarm ware is in order to reduce the optics maze that external light disturbed photoelectric detection subassembly. The photoelectric smoke-sensitive fire alarm optical maze comprises a base, one side of the base is provided with a maze part with a maze channel, the maze channel is formed by matching a first blocking part and a second blocking part, and the first blocking part comprises a first fun and a second fun; the second stop comprises a third port and a fourth port; the third and fourth mons are at an acute angle, and the fourth mons extend between the first and second mons. The utility model discloses an adopt the labyrinth passage of "Z" font or similar "Z" font, on satisfying the required gas exchange efficiency's of alarm basis, can also carry out reflection or scattering many times to external light to reduce the interference of external light to the detection subassembly.

Description

Photoelectric smoke-sensing fire alarm optical labyrinth

Technical Field

The utility model belongs to the technical field of the fire detection warning, concretely relates to can be applied to photoelectric type smoke sensing fire detection alarm in order to reduce the optics maze of external light to its photoelectric detection subassembly interference.

Background

The fire disaster refers to a disastrous burning phenomenon which loses control in time or space, and is one of the most frequent and common main disasters threatening public safety and social development in various disasters; once fire and explosion happen, the casualties are large, and the economic loss is serious. The fire disaster process can be generally divided into five stages of initial stage, development, fierce stage, descent and extinguishment, in the initial stage, the general combustion area is not large, the flame is not high, the radiant heat is not strong, the smoke and gas flow is slow, the combustion speed is not fast, the best period for putting out the fire disaster is provided, and only few manpower and fire-fighting equipment are needed to put out the fire disaster in the stage if the fire disaster is found in time. Therefore, from the viewpoint of fire extinguishing, the earlier discovery and early warning is more beneficial to extinguishing the fire, and the initial and development stages are key stages of fire extinguishing. Therefore, a fire alarm (also called a smoke alarm) has practical significance for preventing fire and reducing fire loss.

The types of fire alarms include: smoke-sensitive fire alarms (including ionic smoke-sensitive and optical smoke-sensitive), temperature-sensitive fire alarms (including fixed-temperature and differential-temperature), gas-detection fire alarms, infrared-detection fire alarms, and the like. The smoke-sensitive fire alarm is the most commonly used fire alarm because the smoke generation process is usually accompanied in the initial stage, and the smoke-sensitive fire alarm can sense smoke to generate a fire early warning signal and can extinguish a fire before the fire is extinguished.

The photoelectric smoke-sensing fire alarm mainly comprises a light source, a photoelectric element and an electronic switch, detects smoke generated at the initial stage of a fire by using a light scattering principle, and sends out a fire alarm signal in time; general photoelectric smoke-sensitive fire alarm devices can be classified into a light-shielding type and a scattering type according to their structural characteristics.

The positions of a light emitting diode and a photoelectric element (namely a receiving tube) of the scattered photoelectric smoke-sensitive fire alarm do not correspond, when no smoke exists, light cannot be emitted to the photoelectric element, and a circuit maintains a normal state; when fire occurs, smoke enters the detector, light is reflected or scattered by smoke particles and received by the photoelectric element, and an optical signal is converted into an electric signal and amplified by the amplifying circuit to send out an alarm signal.

For the photoelectric smoke-sensitive fire alarm, after external light enters the detection assembly, the detection precision is inevitably interfered; therefore, the photoelectric smoke-sensitive fire alarm generally needs to consider adding an optical labyrinth to reduce the light interference of the external light to the detection assembly. For example:

CN2762117Y a chinese utility model patent for a labyrinth of photoelectric detector discloses a labyrinth for photoelectric detector, this labyrinth comprises guide plate, receiving cover, plane of reflection, transmitting cover, transmitting plate, lens, darkroom cover, and the marginal round of shell is located to the guide plate, and in the middle of two transmitting plates are located to the lens, two transmitting plates constitute a plane of reflection, and the both sides of two transmitting plates are located to receiving cover and transmitting cover correspondence. The labyrinth type detector mainly aims at the problem that the detector in the prior art is insensitive or nonresponsive to invisible or black smoke particles, and can respond sensitively to invisible or black smoke particles after being adopted, and is stable and reliable in work and high in signal-to-noise ratio. However, the structure is complex and the application range is narrow.

Chinese utility model patent of CN201965723U improved structure's maze for fire detector discloses a improve structure's maze for fire detector, this maze is covered the annular grating that hinders that forms under this body including circular shape body lower cover, this body is covered under and is equipped with the smog detecting device installing port that is used for installing smog detecting device, the top that should hinder the grating is formed with the contact edge, the contact edge that should hinder the grating and the circular shape on the internal surface in the middle of the probe lid of fire detector hinder the light zone and closely contact and fixed connection each other, it has the one deck to be used for the photic layer that hinders of extinction to coat on the light zone that hinders of probe lid. The blocking grating 26 of the patent also adopts an L-shaped structure, and has no obvious effect of reducing the interference of external light.

Chinese utility model patent of CN108564759A flue gas labyrinth cover discloses a flue gas labyrinth cover for using with the maze cooperation, it includes cylindrical casing, the lateral wall of casing is equipped with multiseriate through-hole along the circumferential direction, all be equipped with the transverse air current guide ring between the through-hole of adjacent two rows on the casing outer wall, be equipped with a plurality of vertical air current guide posts along the even setting of circumferential direction on the inner wall of casing, be equipped with a plurality of light-shields that evenly set up and spaced apart each other and arrange along the circumferential direction in the casing, still be equipped with annular settlement zone on the bottom plate of casing. The influence of the inner structure of the labyrinth cover on the inlet and outlet of the smoke to be detected and the dust resistance of the labyrinth cover are mainly considered, and the influence of external light on the detector is not considered.

Therefore, the existing optical labyrinth is not satisfactory in reducing the influence of external light interference, and a novel optical labyrinth structure applicable to the photoelectric smoke-sensing fire detection alarm is needed to be developed in consideration of cost, manufacturing and anti-interference effects.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can effectively reduce external light to the interference of detecting element, be convenient for make and the suitable optics maze of cost.

In order to achieve the above object, the utility model adopts the following scheme:

a novel photoelectric smoke-sensing fire alarm optical maze is a photoelectric smoke-sensing alarm used for fire detection and alarm, and comprises a base, wherein the base is used for being matched with a detection assembly so as to perform interference reduction treatment on external light; the base is the holding member of this optics maze, and main functional component all directly or indirectly cooperates on it, and one side of base is equipped with maze portion, and external and detection subassembly are kept apart to maze portion, make external gas (including smog) and light all need pass maze portion and can reach the detection subassembly.

The labyrinth part is provided with a labyrinth passage to communicate the detection assembly with the outside, so that the detection assembly normally works to detect and identify smoke.

The labyrinth passage is formed by matching a first blocking part and a second blocking part, the first blocking part comprises a first mons and a second mons, and the second blocking part comprises a third mons and a fourth mons; the angle between the third and fourth mons is acute, and after the first and second stops are mated, the fourth mon extends into the region between the first and second mons.

Preferably, the fourth port extends toward a junction of the first port and the second port, for example: may extend to a position near or at the junction of the first and second ports to form a "zigzag" (also including a zigzag-like) labyrinth passage. In principle, the extending position of the fourth port in the region between the first port and the second port can be various, but in terms of practical effect, extending it to the connection between the first port and the second port can reduce the interference of the external light to the detection assembly to the maximum extent without affecting the gas circulation effect, which is the best solution.

Preferably, the fourth port end is disposed parallel to the second port to form a parallel portion.

Preferably, the cross-sectional shapes of the first, second, third and fourth ports are linear, arcuate or wavy.

Preferably, the angle between the first and second ports is 45-120 °.

Preferably, the angle between the third and fourth ports is 30-60 °, and most preferably 45 °.

Preferably, the cross-sectional shape of the labyrinth portion is a shape having a closed boundary, such as a circular shape, a polygonal shape, or an elliptical shape; except, of course, for the path formed by the labyrinth passage.

Further, the optical maze also includes the cavity, and the cavity is linked together with detecting the subassembly, and the cavity sets up in the central point of maze portion.

Preferably, a flow guide part is arranged in the cavity and comprises a plurality of flow guide pieces so as to prevent the gas or smoke to be detected from directly flowing out without detection after entering the cavity.

Preferably, the labyrinth passage is formed by arranging two adjacent labyrinth blocks at intervals and matching, and the labyrinth blocks comprise a first caruncle, a middle caruncle and a tail caruncle; the first mons and the tail mons are respectively arranged at two ends of the middle mons and have different orientations; the included angle between the medial caruncle and the caudal caruncle is an acute angle, and each labyrinth block is arranged on the base in the same way of facing.

Moreover, the tail mons of the former labyrinth block extend into the area between the head mons and the middle mons of the latter labyrinth block; the mid-port and the tail-port of the former labyrinth block are respectively formed as the third port and the fourth port of the second barrier, while the fore-port and the mid-port of the latter labyrinth block are respectively formed as the first barrier including the first port and the second port.

Preferably, the labyrinth portion has an annular cross-sectional shape, and the verumontanum has an arcuate cross-sectional shape.

The utility model discloses a photoelectric type smoke sensing fire alarm optics maze, through the redesign to labyrinth structure, form the maze passageway that has "Z" font or similar "Z" font to the gas or the smog that supply to wait to detect pass through. On the basis of satisfying the required gas exchange efficiency of alarm, can also carry out reflection or scattering many times to external light through first fender portion and second fender portion, reduce the interference of external light to the detection subassembly.

Drawings

Fig. 1 is a schematic top view of an optical labyrinth according to an embodiment of the present invention, in order to ensure the closing effect of the labyrinth portion, a connecting portion is further provided between a first blocking portion and a second blocking portion forming each labyrinth passage, so that the labyrinth portion is entirely sealed except the labyrinth passage; wherein, the black arrow represents the flow process diagram of the external gas (i.e. the gas to be detected) entering the chamber;

FIG. 2 is a schematic view of the labyrinth passage structure of the embodiment in FIG. 1, which is an enlarged view of a part of the labyrinth passage structure in FIG. 1, and black arrows are used to show the flow process of the outside air;

FIG. 3 is a schematic front perspective view of an optical maze according to another embodiment of the present invention;

FIG. 4 is a schematic diagram of the back structure of the optical maze of the embodiment in FIG. 3;

FIG. 5 is a schematic diagram of a front top view of the optical maze of the embodiment of FIG. 3; wherein, the black arrow represents the flow process schematic diagram of the outside air entering the chamber;

FIG. 6 is a cross-sectional view of the optical maze of the embodiment of FIG. 3;

FIG. 7 is a schematic cross-sectional view of the optical maze and detection assembly of FIG. 3; the upper half part is an optical maze 1, and the lower half part is a detection component 2.

Detailed Description

In order to better understand the invention for those skilled in the art and to define the claimed scope more clearly, the invention will be described in detail below with respect to certain specific embodiments of the invention. It should be noted that the following description is only a few examples of the present invention, and the specific and direct descriptions of the related structures are only for the convenience of understanding the present invention, and the specific features do not naturally and directly limit the scope of the present invention. Conventional alternatives and substitutions made by those skilled in the art in light of the teachings of the present disclosure should be considered as within the scope of the present disclosure.

A novel photoelectric smoke-sensing fire alarm optical maze is used for a photoelectric smoke-sensing alarm for fire detection and alarm; it includes base 100, and base 100 is used for cooperating with the main part of alarm to carry out reflection processing to the external light that gets into wherein, reduce the interference of external light to the alarm, improve fire alarm's early warning degree of accuracy.

The susceptor 100 is provided at one side thereof with a labyrinth portion for isolating the outside from the sensing element so that the sensing element is not interfered by external light, and at the same time, allows gas to pass therethrough to be sensed by the sensing element.

For this, the labyrinth part has a labyrinth passage 300, the labyrinth passage 300 is formed by the first stopper 201 and the second stopper 202 being engaged, the first stopper 201 and the second stopper 202 being protrusively provided on the surface of the base 100; the first barrier 201 includes a first port 211 and a second port 212, and the second barrier 202 includes a third port 213 and a fourth port 214. The angle between the first port 211 and the second port 212 is acute, preferably 30-60, and most preferably 45; the angle between the third port 213 and the fourth port 214 is 45-120. And, after the first barrier 201 is mated with the second barrier 202, the fourth port 214 extends into the region between the first port 211 and the second port 212.

The first blocking portion 201 and the second blocking portion 202 may be respectively manufactured and then coupled to the base 100 by welding, bonding, fastening, or the like, or may be integrally formed with the base 100, and the latter is more preferable.

Optimally, the fourth mons 214 extends to a position near or near the junction of the first mons 211 and the second mons 212 to form a "zigzag" or "zigzag-like" labyrinth passage. In principle, the extending position of the fourth port 214 in the region between the first port 211 and the second port 212 can be varied, but in practical terms, extending it to the connection position or the vicinity of the connection position can reduce the interference of the external light to the detection assembly to the maximum extent without affecting the gas circulation effect, which is the best solution. At this time, the end of the fourth port 214 may be disposed parallel to the second port 212 to form a parallel portion 2141 to reduce the adverse effect on the gas channel.

To ensure the gas exchange effect inside and outside, the narrowest width of labyrinth passage 300 should not be less than 1mm, i.e.: the distance between the front end of the first port 211 and the third port 213 and the distance between the end of the fourth port 214 and the first port 211 or the second port 212 are not less than 1mm, so as to ensure that the inside and outside of the fire alarm have sufficient gas exchange effect. More preferably, the narrowest width of labyrinth passage 300 is not less than 3 mm.

In the case of satisfying the above structure, the cross-sectional shapes of the first, second, third and

fourth mons

211, 212, 213 and 214 may be linear, arc or wavy, and these may all realize the labyrinth function of the present invention, and the specific selection and combination are not limited herein.

In some embodiments, the cross-sectional shape of the labyrinth portion is a closed geometric shape (except for the communication channel of the labyrinth channel 300, of course) such as a circle, a polygon, or an ellipse, that is: the labyrinth portion is in the shape of a seal regardless of the labyrinth passage 300. A connecting part is arranged between the first blocking part 201 and the second blocking part 202 of each labyrinth passage 300, so that the labyrinth part is sealed except the labyrinth passages; for example, as shown in fig. 1, the second stop portion 202 of the previous labyrinth passage 300 and the first stop portion 201 of the subsequent labyrinth passage are connected together to close the gap therebetween, forming a basic unit similar to a "pi" shape.

Preferably, the optical maze further comprises a chamber 101, and the detection assembly is communicated with the chamber 101; the chamber 101 is disposed at a central position (referring to only a relative position, not a "central point" or a "central area" in the conventional sense) of a labyrinth portion forming a closed shape, so that the chamber 101 can communicate with the outside via the labyrinth passage 300.

In order to prevent external gas (i.e. the environmental gas to be detected) from entering labyrinth channel 300 from one side of the labyrinth, passing through chamber 101, and then directly flowing out from labyrinth channel 300 on the other side (certainly, it may also flow out from labyrinth channels 300 in other directions), so as to reduce the detection effect; a flow guide member 102 may be disposed in the chamber 101, wherein the flow guide member 102 includes a plurality of flow guide vanes 1021, so that the external air is turned to flow toward the detection assembly along the axial direction of the optical labyrinth after entering the chamber 101; meanwhile, the interference of external light on the detector can be reduced to a great extent by the turning.

In other preferred embodiments, the labyrinth passages 300 are formed by two adjacent labyrinth blocks 200, and each labyrinth block 200 has the same structure, including a first caruncle 210, a second caruncle 220, and a second caruncle 230, wherein the first caruncle 210 and the second caruncle 230 are respectively disposed at or near two ends of the second caruncle 220, and the two are oriented differently. For example, the first mons 210 extends from one end of the second mons 220 to its right side and the third mons 230 extends from the other end of the second mons 220 to its left side.

The labyrinth block 200 can be regarded as a further optimization of the basic component unit similar to the "pi" shape, and the first port 211 of the first barrier 201 and the third port 213 of the second barrier 202 are overlapped into a part.

The labyrinth blocks 200 are disposed on one side surface of the base 100 at intervals in a ring shape in a circumferential direction, and the labyrinth blocks 200 are disposed on the base 100 in a manner facing the same. Since the labyrinth block 200 has a certain height, a ring-shaped protrusion structure is formed on the side surface of the base 100, and the center of the ring shape is formed as the chamber 101.

The angle between the mons medial 220 and the mons caudal 230 is acute, and the mons caudal 230 of the former labyrinth block 200 extends into the vicinity of the junction of the mons medial 220 and the mons cephalad 210 of the latter labyrinth block 200, thereby forming a labyrinth passage 300 therebetween; the mid-port 220 and the aft-port 230 of the former labyrinth block 200 are respectively formed as the third port 213 and the fourth port 214 of the second barrier 202, while the fore-port 210 and the mid-port 220 of the latter labyrinth block 200 are respectively formed as the first barrier 201 including the first port 211 and the second port 212.

The cross-sectional shape of the labyrinth part is circular ring, the cross-sectional shape of the mons Venetian 210 is arc, and the cross-sectional shapes of the mons Venetian 220 and the mons Venetian 230 are line segments.

It is obvious that the preferred embodiment is a special case of the above-mentioned embodiments, and that the equivalent structures described as being suitable for the above-mentioned embodiments are also suitable for this embodiment.

Furthermore, although in the above embodiments, the first baffle 201 and the second baffle 202 forming the labyrinth passage 300, or the adjacent labyrinth block 200, all form a closed geometric shape except the labyrinth passage 300 in a surrounding manner; but does not mean that the optical maze must do so. The first blocking portion 201 and the second blocking portion 202, or the labyrinth block 200 may be disposed only in several directions and connected by a connecting structure, so as to achieve the object of the present invention, and only the ventilation efficiency is reduced. For example, in the case of a square labyrinth portion, a labyrinth passage group having a certain length is provided only at the center of four vertices or four sides. The labyrinth passage 300 may be arranged in other ways, such as an array, without being limited to a circle.

Claims

1. The photoelectric smoke-sensing fire alarm optical maze comprises a base (100), wherein the base (100) is used for being matched with a detection component; one side of the base (100) is provided with a labyrinth part which isolates the outside from the detection assembly; it is characterized in that the preparation method is characterized in that,

the labyrinth part is provided with a labyrinth passage (300), the labyrinth passage (300) is formed by matching a first blocking part (201) and a second blocking part (202), the first blocking part (201) comprises a first mons (211) and a second mons (212), and the second blocking part (202) comprises a third mons (213) and a fourth mons (214); the angle between the third port (213) and the fourth port (214) is acute, and the fourth port (214) extends into the region between the first port (211) and the second port (212).

2. The optoelectronic smoke-sensitive fire alarm optical maze of claim 1 wherein the fourth port (214) extends toward the junction of the first port (211) and the second port (212) to form a "zigzag" maze path (300).

3. The optoelectronic smoke-sensitive fire alarm optical maze of claim 1 wherein the fourth port (214) ends parallel to the second port (212) to form a parallel portion (2141).

4. The optical maze of the photoelectric smoke-sensitive fire alarm of claim 1, wherein the cross-sectional shapes of the first, second, third and fourth ports (211, 212, 213, 214) are straight, arc or wave.

5. The optoelectronic smoke-sensitive fire alarm optical maze of claim 1 wherein the angle between the first (211) and second (212) ports is 45-120 °; and/or the presence of a gas in the gas,

the included angle between the third port (213) and the fourth port (214) is 30-60 degrees.

6. The photoelectric smoke-sensitive fire alarm optical labyrinth according to claim 1, wherein the cross-sectional shape of the labyrinth portion is a circular, polygonal or elliptical shape.

7. The optical labyrinth of the photoelectric smoke-sensing fire alarm device as claimed in claim 6, further comprising a chamber (101), wherein the chamber (101) is communicated with the detection assembly, and the chamber (101) is arranged at the central position of the labyrinth part.

8. The optical labyrinth of an optoelectronic smoke-sensitive fire alarm according to claim 7, characterized in that a flow guide (102) is arranged in the chamber (101), the flow guide (102) comprising a number of flow guide vanes (1021).

9. The optical maze of the photoelectric smoke-sensitive fire alarm device of claim 1, wherein the maze passage (300) is formed by two adjacent maze blocks (200) which are arranged at intervals and matched, and the maze blocks (200) comprise a caruncle (210), a monuncle (220) and a caruncle (230); the fore-mons (210) and the aft-mons (230) are respectively arranged at two ends of the mid-mons (220), and the orientations of the fore-mons and the aft-mons are different;

the included angle between the medial caruncle (220) and the caudal caruncle (230) is an acute angle, and each labyrinth block (200) is arranged on the base (100) in an orientation-same way;

moreover, the Venus Venerupis (230) of the former labyrinth block (200) extends into the area between the Venus Venerupis (210) and the Venus Venerupis (220) of the latter labyrinth block (200); the mid-port (220) and the tail-port (230) of the former labyrinth block (200) are respectively formed as a third port (213) and a fourth port (214) of the second barrier (202), and the fore-port (210) and the mid-port (220) of the latter labyrinth block (200) are respectively formed as a first barrier (201) including a first port (211) and a second port (212).

10. The optical labyrinth of the photoelectric smoke-sensitive fire alarm device as claimed in claim 9, wherein the cross-sectional shape of the labyrinth portion is circular ring shape, and the cross-sectional shape of the first port (210) is arc shape.