CN219418242U - Smoke detector - Google Patents

Abstract

The utility model provides a smoke detector, which comprises a shell and a darkroom positioned in the inner cavity of the shell, wherein an infrared emitter and an infrared receiver are arranged in the darkroom, the side wall of the darkroom is an anti-aperture, a plurality of ventilation gaps are arranged on the anti-aperture, a plurality of pairs of shading ribs arranged in an included angle form are arranged on the inner side of the anti-aperture, and the included angle surface of each pair of shading ribs forms a reflecting surface for reflecting infrared light; the light reflecting ring comprises an inclined surface section and a straight surface section, the light reflecting surface of the shading rib connected to the inclined surface section is inclined downwards, and the light reflecting surface of the shading rib connected to the straight surface section is vertically arranged; the emission port of the infrared emitter is opposite to the inclined plane section; the side wall of the shell close to the bottom is provided with a smoke inlet window and a water outlet hole. The detector adopts the K-shaped reflecting units to form the darkroom diaphragm in a stacked mode, and meanwhile, the reflecting surfaces of part of the K-shaped reflecting units incline downwards, and air can circulate at the bottom side and the periphery side of the darkroom, so that the darkroom can move backwards to leave a smoke inlet cavity, and the defect that dust and fog drops are accumulated in the darkroom is overcome.

Description

Smoke detector

Technical Field

The utility model relates to the technical field of fire-fighting equipment, in particular to a smoke detector.

Background

The smoke detector is used as fire detection equipment in the field of fire control and is widely applied to public places such as houses, office buildings, schools, hospitals and the like. The main working principle of the smoke detector is as follows: an infrared emitter and an infrared receiver are arranged in the smoke detector, under the condition that no smoke exists, one part of light rays of the infrared emitter are reflected out through a darkroom wall with a specific angle, the other part of light rays are repeatedly reflected in the darkroom, and finally, one part of light rays are received by the infrared receiver, and when the static value of the light rays received by the infrared receiver is low, an alarm is not triggered; when the smoke particles enter the smoke detector, a large amount of light rays of the infrared transmitter are received by the infrared receiver through reflection and refraction of the smoke particles, and when the received light rays exceed a threshold value, smoke alarm is triggered. Therefore, the specific structure, the arrangement mode, the waterproof performance and the like of the darkroom can directly influence the reflection track of light rays in the optical darkroom, and further influence the sensitivity and the stability of the smoke alarm.

Most smoke detectors are installed on smallpox, when encountering overcast, rainy and humid weather, ponding is easy to form on the smallpox, and the ponding can flow into the smoke detectors along the wire rod, corrode components and parts on the circuit board to form water mist on the side wall in the darkroom, make the smoke detectors receive the interference of water mist and report to the police by mistake. In addition, the darkroom of the smoke detector needs to be arranged in a ventilated environment, so that the darkroom is generally arranged at the front end of the body of the smoke detector, dust is easily accumulated in the darkroom for a long time, the light reflection effect of the optical darkroom is affected, and the sensitivity and the stability of the smoke alarm are also affected.

Disclosure of Invention

Aiming at the defects of the background technology, the utility model provides a smoke detector which can solve the problem that the sensitivity and stability of the smoke detector are reduced due to the fact that a darkroom is attached with water mist and the darkroom is filled with dust.

The utility model provides a smoke detector, which comprises a shell and a darkroom positioned in the inner cavity of the shell, wherein an infrared emitter and an infrared receiver are arranged in the darkroom, the side wall of the darkroom is an anti-aperture, a plurality of ventilation gaps are arranged on the anti-aperture, a plurality of pairs of shading ribs arranged in an included angle form are arranged on the inner side of the anti-aperture, and the included angle surface of each pair of shading ribs forms a reflecting surface for reflecting infrared light;

the light reflecting ring comprises an inclined surface section and a straight surface section, the light reflecting surface of the shading rib connected to the inclined surface section is inclined downwards, and the light reflecting surface of the shading rib connected to the straight surface section is vertically arranged;

the emission port of the infrared emitter is opposite to the inclined plane section;

the side wall of the shell close to the bottom is provided with a smoke inlet window and a water outlet hole.

Preferably, the reflecting ring is formed by sequentially superposing a plurality of K-shaped reflecting units, and the single K-shaped reflecting unit comprises a supporting plate and a pair of shading ribs connected to the supporting plate;

a ventilation gap is reserved between two adjacent K-shaped reflecting units.

Preferably, the shell comprises top cover and backshell, and the middle part of top cover is concave to form into cigarette cavity, advances the cigarette window and opens in the side of advancing cigarette cavity, and reflector ring part gets into in the cigarette cavity.

Preferably, the top plate at the bottom of the smoke inlet chamber is connected with the body of the top cover through a group of inclined ribs;

the group of oblique ribs are arranged at intervals, and gaps among the oblique ribs form a group of smoke inlet windows which are annularly arranged.

Preferably, the water outlet is formed in at least one inclined rib, a circle of water retaining wall is arranged on the inner wall of the top cover in a surrounding mode, and the water retaining wall is communicated with the water outlet through the drainage groove.

Preferably, the side wall of the housing is provided with a flow guiding channel.

Preferably, the periphery of the top cover is provided with an upper surrounding edge, and the side wall of the rear shell is sleeved on the inner side of the upper surrounding edge;

the diversion channel is formed by a gap between the upper surrounding edge and the side wall of the rear shell.

Preferably, the smoke detector further comprises a mounting seat, and the smoke detector is fixed with the wall through the mounting seat;

the periphery of the mounting seat is provided with a lower flanging which is nested in a gap between the upper surrounding edge and the side wall of the rear shell, and the diversion channel is divided into an outer channel and an inner channel;

the outer runner is formed by a gap between the lower flanging and the upper surrounding edge, and the top end height of the upper surrounding edge is lower than the top end height of the lower flanging, so that a notch for drainage is formed;

the inner flow passage is formed by a gap between the inner wall of the rear shell and the lower flanging, and the mounting seat is provided with a drainage hole communicated with the inner flow passage.

Preferably, the middle part of the rear shell is upwards convex to form a floating platform, and the upwards convex space of the floating platform forms a circuit board chamber;

the top surface of the rear shell forms a drainage slope or a step surface with a raised middle part.

Preferably, the periphery of the reflecting ring is also provided with a layer of insect-proof net.

According to the utility model, the K-shaped reflecting units are overlapped to form the darkroom diaphragm, and meanwhile, the reflecting surfaces of part of the K-shaped reflecting units are inclined downwards, so that air can circulate at the bottom side and the peripheral side of the darkroom, the darkroom can move backwards to leave a smoke inlet cavity, and the defect that dust and fog drops are accumulated in the darkroom is overcome; the smoke detector also utilizes the shell to construct a drainage channel, so that the condition that the device is damaged or flows into a darkroom to influence the detection accuracy due to the fact that the ceiling ponding enters the smoke detector and corrodes a circuit board is avoided.

Drawings

The utility model is described in detail below with reference to examples and figures, wherein:

FIG. 1 is an exploded view of the structure of the smoke detector of the present utility model.

Fig. 2 is a bottom view of the counter aperture.

Fig. 3 is a schematic structural view of a K-shaped light reflecting unit.

Fig. 4 is a top view of the top cover.

Fig. 5 is a top view of the rear housing.

Fig. 6 is a top view of the mount.

FIG. 7 is a schematic view of drainage of a smoke detector of the present utility model.

Reference numerals:

the smoke-entering and smoke-exiting device comprises a top cover, a 11-smoke-entering window, a 12-water outlet, a 13-smoke-entering cavity, a 14-water retaining wall, a 15-upper surrounding edge, a 16-inclined rib, a 2-rear shell, a 21-circuit board cavity, a 22-step surface, a 3-mounting seat, a 31-downward flanging, a 4-reverse aperture, a 41-K-shaped reflecting unit, a 411-supporting plate, a 412-light-shielding rib, a 42-inclined surface section, a 43-straight surface section, a 5-darkroom, a 51-infrared emitter, a 52-infrared receiver, a 6-diversion channel, a 61-notch, a 62-outer runner, a 63-inner runner, a 64-diversion hole, a 7-circuit board and an 8-insect-preventing net.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Thus, reference throughout this specification to one feature will be used in order to describe one embodiment of the utility model, not to imply that each embodiment of the utility model must be in the proper motion. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

The principles of the present utility model are described in detail below with reference to the drawings and examples.

The utility model provides a smoke detector, which comprises a shell and a darkroom 5 positioned in the inner cavity of the shell, wherein an infrared emitter 51 and an infrared receiver 52 are arranged in the darkroom 5, the side wall of the darkroom 5 is provided with an anti-aperture 4, a plurality of ventilation gaps are arranged on the anti-aperture 4, a plurality of pairs of shading ribs 412 which are arranged in an included angle manner are arranged on the inner side of the anti-aperture 4, and the included angle surface of each pair of shading ribs 412 is used for reflecting the reflective surface of infrared light;

the diaphragm 4 comprises an inclined surface section 42 and a straight surface section 43, the reflecting surface of the shading rib 412 connected with the inclined surface section 42 is inclined downwards, and the reflecting surface of the shading rib connected with the straight surface section 43 is vertically arranged;

the emission port of the infrared emitter 51 is opposite to the bevel section 42;

the side wall of the shell close to the bottom is provided with a smoke inlet window 11 and a water outlet hole 12.

In this embodiment, the aperture stop 4 is formed by sequentially stacking a plurality of K-shaped light reflecting units 41, and a single K-shaped light reflecting unit 41 includes a support plate 411 and a pair of light shielding ribs 412 connected to the support plate 411;

a ventilation gap is left between two adjacent K-shaped reflecting units 41.

The casing comprises top cap 1 and backshell, and the middle part of top cap 1 is concave to form into cigarette cavity 13, advances the cigarette window 11 and opens in the side of advancing cigarette cavity 13, and the reflector ring latter half gets into in the cigarette cavity.

The pair of light shielding ribs 412 of the K-shaped light reflecting unit 41 are disposed at an acute angle, each light shielding rib 412 is of a rectangular sheet structure, a smoke channel with a certain angle is formed between each pair of light shielding ribs 412, and infrared light is reflected in the darkroom 5 for multiple times. The section of the reflector 4 facing the emitting port of the infrared emitter 51 is the most concentrated part of reflection, and if accumulated water, fog drops or dust and other impurities adhere to the section of the reflector 4, the accuracy of the smoke detector can be seriously affected. In this embodiment, the light shielding ribs 412 of the inclined surface section 42 are designed to incline toward the top wall of the housing, so that dust accumulation is avoided, and the operation state of the smoke detector is kept stable for a long time.

Because of the ventilation requirement, the housing of the smoke detector cannot be sealed, and the accumulated water of the ceiling easily permeates into the smoke detector to corrode the circuit board 7 or adhere to the diaphragm 4 of the darkroom 5 to interfere with smoke detection. In this embodiment, the side wall of the housing is provided with a diversion channel 6, and the diversion channel 6 is used for discharging water collected by converging mist droplets in the darkroom 5 and water entering the smoke detector from the roof ceiling. The shell is made of plastic waterproof materials, so that the diversion channel 6 utilizes the design of the shell to drain water through the diversion channel 6, and the circuit board 7 and the darkroom 5 inside the shell are protected.

Specifically, the peripheral side of the top cover 1 is provided with an upper peripheral edge 15, and the side wall of the rear shell 2 is sleeved on the inner side of the upper peripheral edge 15;

the diversion channel 6 is formed by a gap between the upper surrounding edge 15 and the side wall of the rear shell 2, and the bottom end of the diversion channel 6 is communicated with the water outlet 12.

The smoke detector also comprises a mounting seat 3, and the smoke detector is fixed on the mounting surface such as a ceiling and the like through the mounting seat 3. The structure of the mounting seat 3 is also designed for drainage. The circumference of the mounting seat 3 is provided with a lower flanging 31, the lower flanging 31 is nested in a gap between the upper surrounding edge 15 and the side wall of the rear shell 2, and the diversion channel 6 is divided into an outer channel 62 and an inner channel 63;

the outer runner 62 is formed by a gap between the lower flange 31 and the upper peripheral edge 15, the top end of the upper peripheral edge 15 is lower than the top end of the lower flange 31, a notch 61 for drainage is formed, and the notch 61 is used for guiding water flowing from a ceiling on the periphery of the smoke detector to the smoke detector;

the inner runner 63 is formed by a gap between the inner wall of the rear shell 2 and the downward flange 31, and the mounting seat 3 is provided with a drainage hole 64 communicated with the inner runner 63, and the drainage hole 64 is used for guiding accumulated water in the range of the top surface of the mounting seat 3.

The sinking table is connected with the body of the top cover 1 through 8 inclined pull ribs 16, the inclined pull ribs 16 are arranged at intervals, and the gaps between the inclined pull ribs 16 enclose into 8-grid smoke inlet windows 11 which are annularly arranged.

In this embodiment, there are 4 inclined ribs 16 with water outlet holes 12, and a circle of water retaining wall 14 is arranged on one side wall of the inner wall of the top cover 1, and the water retaining wall 14 is communicated with the water outlet holes 12 through drainage grooves.

In the embodiment, the middle part of the rear shell 2 is upwards convex to form a floating platform, and the upwards convex space of the floating platform forms a circuit board chamber 21 for accommodating the circuit board 7;

the top surface of the rear shell 2 forms a step surface 22 with a raised middle part, and accumulated water between the mounting seat 3 and the rear shell 2 can flow to the diversion channel 6 through the step surface 22.

The mounting base 3, the rear housing 2 and the top cover 1 of the present embodiment constitute a complete drainage system. The drainage system works as follows: some of the water affecting the smoke detector comes from condensation water entering the darkroom 5 with the airflow, and another part comes from the smallpox ponding. If condensation water is generated on the diaphragm 4, the condensation water can drop down onto the inner wall of the top cover 1, and enter the water outlet hole 12 along the water retaining wall 14 to be discharged. In addition, due to the inclined design, the inclined section 42 of the reflector 4 can make condensed water more difficult to accumulate than the straight section 43, and the condensed water is more likely to drop off from the reflecting surface of the light shielding rib 412. On one hand, the ceiling ponding enters the outer flow channel 62 from the periphery of the smoke detector through the notch 61 between the lower flange 31 and the upper surrounding edge 15, then reaches the top cover 1 along the diversion channel 6, and finally is discharged from the water outlet 12 along the water retaining wall 14 of the top cover 1; the accumulated water just above the mounting seat 3 enters the drainage hole 64, enters 6 through the inner flow channel 63 to be converged, reaches the top cover 1 along 6, and finally is discharged from the water outlet hole 12 along the water retaining wall 14 of the top cover 1.

When the smoke detector works, external air flow enters the smoke inlet cavity 13 from the smoke inlet window 11 and then enters the darkroom 5 from the side face of the reflecting ring 4. If the temperature of the air flow is higher, the air flow can be discharged from the notch 61 and the drainage hole 64 through the diversion channel 6, so that the smoke can enter the darkroom more conveniently, the detection precision of the smoke detector is improved, and the drainage system of the embodiment can also be used as an air flow channel.

The product of the background technology is not provided with an air flow passage, and air flow cannot circulate in the smoke detector, so that a darkroom can only be designed at the front end of the body of the smoke detector, and the area of the air flow crossing the darkroom is increased. Because the darkroom is totally exposed outside the smoke detector body, dust can be directly accumulated in the darkroom 5 after a long time, the reflection effect of the anti-diaphragm 4 is affected, the smoke detection precision is poor, and false alarm is easily caused by dust accumulation.

In this embodiment, a layer of insect-proof net 8 is further disposed on the periphery of the reflective ring 4. The insect-proof net 8 is provided with a plurality of square micropores which can isolate the entry of insects, and the micropores are uniformly distributed on the insect-proof net 8. The insect-proof net 8 can effectively prevent insects from entering the insect-proof net 8, and false alarm caused by the entering of insects is avoided.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The smoke detector comprises a shell and a darkroom positioned in an inner cavity of the shell, wherein an infrared emitter and an infrared receiver are arranged in the darkroom;

the light reflecting ring comprises an inclined surface section and a straight surface section, the light reflecting surface of the shading rib connected to the inclined surface section is inclined downwards, and the light reflecting surface of the shading rib connected to the straight surface section is vertically arranged;

the emission port of the infrared emitter is opposite to the inclined plane section;

the side wall of the shell close to the bottom is provided with a smoke inlet window and a water outlet hole.

2. The smoke detector as set forth in claim 1, wherein the reflector ring is formed by sequentially stacking a plurality of K-shaped reflector units, a single K-shaped reflector unit including a support plate, and a pair of light shielding ribs connected to the support plate;

and the ventilation gap is reserved between two adjacent K-shaped reflecting units.

3. The smoke detector of claim 2, wherein the housing is comprised of a top cover and a rear housing, wherein a central portion of the top cover is recessed to form a smoke inlet chamber, the smoke inlet window is formed on a side surface of the smoke inlet chamber, and the reflector portion enters the smoke inlet chamber.

4. The smoke detector of claim 3, wherein the top plate at the bottom of the smoke inlet chamber is connected with the body of the top cover through a set of diagonal ribs;

the group of oblique ribs are arranged at intervals, and gaps among the oblique ribs form a group of smoke inlet windows which are annularly arranged.

5. The smoke detector of claim 4, wherein at least one of the diagonal ribs is provided with the water outlet, the inner wall of the top cover is provided with a circle of water retaining wall, and the water retaining wall is communicated with the water outlet through a drainage groove.

6. The smoke detector as defined in claim 5 wherein the side wall of the housing is provided with a flow guide channel.

7. The smoke detector of claim 6, wherein the top cover has an upper peripheral edge on a peripheral side thereof, and the side wall of the rear housing is sleeved on an inner side of the upper peripheral edge;

the diversion channel is formed by a gap between the upper surrounding edge and the side wall of the rear shell.

8. The smoke-sensitive detector of claim 7, further comprising a mount by which the smoke-sensitive detector is secured to a wall;

the periphery of the mounting seat is provided with a lower flanging which is nested in a gap between the upper surrounding edge and the side wall of the rear shell, and the diversion channel is divided into an outer channel and an inner channel;

the outer flow channel is formed by a gap between the lower flanging and the upper surrounding edge, and the top end of the upper surrounding edge is lower than the top end of the lower flanging, so that a notch for drainage is formed;

the inner flow passage is formed by a gap between the inner wall of the rear shell and the downward flanging, and the mounting seat is provided with a drainage hole communicated with the inner flow passage.

9. The smoke detector of claim 8, wherein the central portion of the rear housing is convex upward to form a floating platform, and the convex upward space of the floating platform forms a circuit board chamber;

the top surface of the rear shell forms a drainage slope or a step surface with a raised middle part.

10. The smoke detector as defined in claim 1, wherein the periphery of the reflector is further provided with an insect-proof net.