CN210865011U

CN210865011U - Smoke sensor with optical labyrinth structure

Info

Publication number: CN210865011U
Application number: CN201922463065.0U
Authority: CN
Inventors: 梁永富; 段艳明; 王凯
Original assignee: Shenzhen Anshi Intelligent Co ltd
Current assignee: Shenzhen Anshi Intelligent Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-06-26
Anticipated expiration: 2029-12-31

Abstract

An optical labyrinth smoke sensor, comprising: the device comprises a concave plastic upper shell, a Y-shaped photoelectric transceiving diode support, a maze base with a protruding structure and a metal insect-proof net, wherein one end of the Y-shaped support is provided with two light-emitting diode cavities, and the other end of the Y-shaped support is provided with a photosensitive receiving tube cavity. The light-emitting diode cavity and the photosensitive receiving tube cavity are both arranged in an upward inclined mode, and the upward inclined angles of the two emitting tube cavities are the same; the support sets up in the maze base, the metal fly net cover is located "Y" type photoelectric transceiver diode support outside, the maze epitheca can be dismantled with the maze base and be connected. The smoke sensor has the advantages of high response speed, better sensitivity direction and directivity, and capability of distinguishing the size of particles entering a labyrinth, eliminating interference sources and avoiding false alarm.

Description

Smoke sensor with optical labyrinth structure

Technical Field

The utility model relates to a smog alarm technology field, concretely relates to smoke transducer of optics maze structure.

Background

The photoelectric smoke sensor is widely applied to various fields such as city security, districts, factories, companies, schools, families, warehouses and the like.

The smoke sensor is widely used in buildings as a device for finding fire and giving an alarm, and the optical maze of the traditional smoke sensor consists of an infrared transmitting tube, an infrared receiving tube and a smoke chamber. Under normal conditions, the infrared receiving tube cannot receive the optical signal emitted by the infrared emitting tube. After the smoke enters the smoke chamber, due to the diffuse reflection effect of smoke particles, the infrared receiving tube receives the optical signal emitted by the infrared emitting tube and generates photocurrent, so that the conversion from the smoke signal to the electrical signal is realized. When the signal intensity exceeds a preset alarm value, the judgment and the alarm of the fire are realized.

However, in the optical sensor (commonly called as a labyrinth) of the existing smoke sensor, an optical plane formed by a transmitting tube cavity and a receiving tube is vertical to the end surface of an upper cover of the optical labyrinth, and the base is provided with the optical labyrinth with a stack structure; the situation that the directionality of smoke detected by the sensor is poor due to the fact that the structures of the base stack columns for smoke inlet are not uniform exists. In addition, the optical maze only has one infrared transmitting tube and one infrared receiving tube, so that smoke is judged as long as tiny particles enter the cavity in principle, other non-smoke particles such as water vapor are judged as smoke by mistake, and phenomena such as false alarm are caused.

SUMMERY OF THE UTILITY MODEL

The application provides a smoke sensor with an optical labyrinth structure, which aims to solve the problems that the traditional optical labyrinth is limited by a self design principle and a structure, the response speed of smoke is low after the smoke enters the labyrinth, the sensitivity directivity is poor, and the repeatability is poor; the problem that the traditional smoke sensor is easily interfered by external environment and generates non-fire false alarm can be solved.

The application provides a smoke sensor of optical maze structure, includes: the LED light source comprises a concave plastic upper shell, a Y-shaped photoelectric transceiving diode support, a labyrinth base with a bulge structure and a metal insect-proof net, wherein two light-emitting diode cavities are arranged at one end of the Y-shaped support, and a photosensitive receiving tube cavity is arranged at the other end of the Y-shaped support. The light emitting diode cavity and the photosensitive receiving tube cavity are both arranged in an upward inclined manner, the upward inclined angles of the two transmitting tube cavities are the same, and the light emitting diode can be a random combination of light emitting diodes with wavelengths of 940nm or 850nm, such as infrared light, blue light, red light and the like; the support is arranged on the labyrinth base, the metal insect-proof net is sleeved outside the Y-shaped photoelectric transceiving diode support, and the labyrinth upper shell is detachably connected with the labyrinth base; the middle part of the inner surface of the top cover is provided with a recess, the outer side of the recess is provided with a plurality of first annular conical hammer-shaped toothed protrusions, the outer side of the conical hammer-shaped toothed protrusions is annularly provided with a plurality of herringbone fences to form a smoke inlet channel, and the outer side of the smoke inlet channel is provided with an annular surrounding bone.

In some embodiments, the angle C between the infrared light emitting diode cavity and the infrared emitter tube cavity is 31 degrees, and the angle D between the photosensitive receiver tube cavity and the infrared light emitting diode cavity is 164.5 degrees.

In some embodiments, the upward-inclined angle E of the infrared light emitting diode cavity or the upward-inclined angle E of the infrared emission tube cavity is 20.7 degrees; the upward inclined angle of the cavity of the photosensitive receiving tube is 20 degrees in terms of the angle F

In some embodiments, the outer surface of the top cover of the labyrinth upper shell is provided with a Y-shaped indicator.

In some embodiments, two sinking platforms are further arranged on the inner side of the smoke inlet channel.

In some embodiments, a metal insect net is placed between the surround and the chevron-shaped barrier.

In some embodiments, a protrusion for shielding light is disposed in the middle of the "Y" shaped photo diode support, a groove is disposed in the middle of the protrusion, and two positioning pins are disposed at the bottom of the "Y" shaped photo diode support to facilitate mounting on a printed circuit board.

In some embodiments, the surfaces of all three cavities are provided with fine shining and matte patterns for preventing light reflection.

In some embodiments, a plurality of second annular conical surface hammer-shaped tooth-shaped bulges are arranged in the middle of the labyrinth base, and fine shining dummy grains are arranged on the surfaces of the second annular conical surface hammer-shaped tooth-shaped bulges; the labyrinth base is provided with an eave-shaped structure for placing the Y-shaped photoelectric transceiving diode bracket.

In some embodiments, the labyrinth upper shell is connected with the labyrinth base in a buckling manner, and a plurality of buckles are arranged on the outer edge of the labyrinth upper shell; the outer edge of the labyrinth base is provided with a plurality of clamping holes.

According to the embodiment, the smoke sensor has the advantages that the upper shell of the smoke sensor adopts the unique herringbone fence to form the smoke inlet channel, smoke enters the labyrinth, the response speed is high, and the sensitivity direction is better in directivity; the double-transmitting-receiving labyrinth has the advantages of reasonable structure, high detection sensitivity, high response speed, easy detection of tiny particles and good directivity; in addition, the optical maze uses two light sources with different wavelengths, and smoke particles with different diameters have different emission intensities to the light sources with different wavelengths, so that the intensity received by the photosensitive receiving tube is different, the sizes of particles entering the maze can be distinguished, whether the currently detected particles belong to the smoke particles or not is indirectly distinguished, and the capability of the smoke sensor for eliminating interference sources and avoiding false alarm is improved.

Drawings

FIG. 1 is an exploded view of an embodiment of an optical maze configured smoke sensor;

FIG. 2 is a cross-sectional view of an embodiment of an optical maze configured smoke sensor;

FIG. 3 is a schematic view of the opposite side of the labyrinth upper shell of an optical labyrinth smoke sensor according to an embodiment;

FIG. 4 is a schematic view of the front of the labyrinth upper shell of the smoke sensor of the optical labyrinth structure according to an embodiment;

FIG. 5 is a cross-sectional view of a labyrinth upper shell of an optical labyrinth configuration smoke sensor of an embodiment;

FIG. 6 is a bottom view, top view, partially enlarged view of a labyrinth upper shell of an optical labyrinth smoke sensor in accordance with an embodiment;

FIG. 7 is a schematic top view of a "Y" shaped photodiode mount of an embodiment of an optical maze configured smoke sensor;

FIG. 8 is a side view of a "Y" shaped photodiode mount of an embodiment of a smoke sensor in an optical maze configuration;

FIG. 9 is an angled view of an embodiment of a "Y" shaped photodiode mount of a smoke sensor in an optical maze configuration;

FIG. 10 is a cross-sectional view of a "Y" shaped photodiode mount of an embodiment of an optical maze configured smoke sensor;

FIG. 11 is a perspective view of a labyrinth base of an optical labyrinth smoke sensor in accordance with one embodiment;

figure 12 is a top view and a cross-sectional view of a "Y" shaped photodiode mount of an embodiment of an optical maze configured smoke sensor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Referring to fig. 1-12, the present application provides an optical maze-structured smoke sensor comprising: labyrinth upper shell 3, "Y" type photoelectric transceiver diode support 1, labyrinth base 2 and metal fly net 4. This "Y" type photoelectric transceiver diode support 1 sets up on labyrinth base 2, and the metal fly net 4 cover is located "Y" type photoelectric transceiver diode support 1 outside, and labyrinth epitheca 3 can be dismantled with labyrinth base 2 and be connected.

The "Y" type photodiode transceiver 1 has three cavities: the red light diode cavity and the infrared transmitting tube cavity are arranged at one end of the Y-shaped photoelectric transceiving diode bracket 1, the photosensitive receiving tube cavity is arranged at the other end of the Y-shaped photoelectric transceiving diode bracket, a red light emitting tube 53 is arranged in the red light emitting tube cavity, an infrared transmitting tube 52 is arranged in the infrared transmitting tube cavity, and a photosensitive receiving tube 51 is arranged in the photosensitive receiving tube cavity. The red light emitting tube cavity, the infrared emitting tube cavity and the photosensitive receiving tube cavity are all arranged in an upward inclined mode, wherein the upward inclined angle of the red light emitting tube cavity is the same as the upward inclined angle of the infrared emitting tube cavity and is represented by an angle E; the angle at which the photosensitive receiving tube cavity is upwardly inclined is indicated by angle F.

Referring to fig. 6 or 10, in some embodiments, the angle C between the infrared led cavity and the infrared emitter cavity is 31 degrees, and the angle D between the photosensitive receiver cavity and the infrared led cavity is 164.5 degrees. In actual production, an error of ± 0.5 degrees is allowed.

Referring to fig. 11, in some embodiments, the angle E of upward inclination of the red light emitting tube cavity or the angle E of upward inclination of the infrared light emitting tube cavity is 20.7 degrees; the angle of the upward inclination of the cavity of the photosensitive receiving tube is 20 degrees at an angle F.

Referring to fig. 2-6, in some embodiments, the top cover outer surface of the labyrinth upper shell 3 is provided with a Y-shaped indicator 34. The middle part of the inner surface of the top cover is provided with a recess 33, the recess 33 utilizes fine particles to scatter and refract part of light, and direct reflection to a photosensitive receiving tube is avoided, so that the reliability of the sensor is improved; a plurality of hammer-shaped toothed projections 31 with first annular conical surfaces are arranged outside the depressions 33, and a plurality of herringbone fences 36 are annularly arranged outside the hammer-shaped toothed projections 31 with the first conical surfaces to form a smoke inlet channel. The smoke inlet channel formed by the herringbone fences is beneficial to the transverse airflow guide channel, and the fences are arranged in a plurality of numbers, are uniformly arranged along the circumferential direction and are arranged at intervals, so that the shading effect can be achieved.

The outer side of the smoke inlet channel is provided with an annular surrounding bone 32, and a gap 38 between the surrounding bone 32 and the herringbone fence 36 is used for placing the metal insect-proof net 4. Two sinking platforms 35 are arranged on the inner side of the smoke inlet channel and are used for being matched with the protruding structures of the clearance labyrinth base 2.

Referring to fig. 7-10, in some embodiments, the middle of the "Y" shaped photodiode support 1 is provided with a protrusion 9 for blocking light; the middle of the bulge 9 is provided with a groove 10; two positioning pins 12 are arranged at the bottom of the Y-shaped photoelectric transceiving diode bracket 1, so that the mounting on a printed circuit board is facilitated.

In some embodiments, the surface of one, two or all of the three cavities may be provided with fine matte patterns for preventing light reflection.

Referring to fig. 11 to 12, in some embodiments, a plurality of second annular conical-surface hammer-shaped tooth-shaped protrusions 25 are arranged in the middle of the labyrinth base 2, and fine matte patterns for preventing light reflection can be further arranged on the surfaces of the second annular conical-surface hammer-shaped tooth-shaped protrusions 25; the labyrinth base 2 is provided with an eave-shaped structure 26 for placing the Y-shaped photoelectric transceiving diode bracket 1; the outer edge of the labyrinth base 2 is provided with a plurality of downwardly facing catches 14 for mounting a smoke sensor.

In some embodiments, the labyrinth upper shell 3 is snap-connected with the labyrinth base 2, and the outer edge of the labyrinth upper shell 3 is provided with a plurality of snaps 37; the outer edge of the labyrinth base 2 is provided with a plurality of upward-facing clamping holes 13.

The labyrinth base 2 has an outer diameter designated as R1 and an inner diameter designated as R2, the inner diameter of the largest ring of the plurality of first annular tapered hammer-shaped toothed projections 31 is designated as R3, and the inner diameter of the recess 33 is designated as R4. The long leg length of the chevron fence is indicated as L1 and the long leg width is indicated as L2. The inside diameter of the labyrinth base 2 is indicated as R5 and the width of the three cavities is indicated as L5.

The two transmitting tubes and the two receiving tubes are respectively arranged in a cavity of the Y-shaped photoelectric transceiving diode bracket; the red light emitting diode cavity and the infrared emitting tube cavity are arranged on the same side, an included angle is formed by the two light emitting diode cavities, the receiving tube cavity is arranged on the other side and is arranged in a Y-shaped included angle, in a specific embodiment, a red light emitting diode with the diameter of phi 3mm and the peak wavelength of 633nm and an infrared emitting tube with the diameter of phi 3mm and the peak wavelength of 945nm are used as a light source and a transmitter, and a photosensitive receiving tube with the peak wavelength of 940n is used as a receiver; r1-48.8 mm, R2-45.8 mm, R3-34.5 mm, R4-10 mm, R5-49.3 mm, L1-6.9 mm, L2-1.1 mm, L5-6.8 mm. Through the test:

the requirements for the EN14604 and GB20517 standards on the directionality of smoke sensitivity of smoke sensors: smoke enters from 8 directions of the smoke sensor (a fixed reference point is selected, and the smoke sensor performs testing every 45 degrees), the smoke sensitivity of the smoke sensor is recorded when the smoke sensor sends out an alarm signal, the ratio of the maximum sensitivity to the minimum sensitivity in the 8 directions does not exceed 1.60, and the performance is better when the ratio is closer to 1.

For the requirements of EN14604 and GB20517 standards on the smoke sensitivity repeatability of the smoke sensor, smoke enters 6 times from one fixed direction of the smoke sensor, the smoke sensitivity of the smoke sensor is recorded when the smoke sensor sends out an alarm signal, the ratio of the maximum sensitivity to the minimum sensitivity in 6 tests is not more than 1.60, and the performance is better when the ratio is closer to 1.

Test data show that the smoke sensitivity of the smoke maze is better in directivity, stable in performance and superior in detection sensitivity.

For the sensor of the present application, the labyrinth upper shell 3 adopts a unique herringbone fence to form a smoke inlet channel. When the sensor is in a normal working environment, the surrounding air does not contain smoke particles, the receiving pipe does not receive the feedback signal of the smoke particles, and the sensor does not give an alarm. When smoke particles enter a labyrinth, red light and infrared light emitted by the red light tube and the infrared emission tube irradiate the smoke particles when working, so that light rays are subjected to diffuse reflection and enter the photosensitive receiving tube to form a current signal, the stronger the smoke concentration is, the stronger the current signal is, the sensor amplifies the signal and then conducts digital quantitative analysis, and when the smoke reaches a certain concentration, the sensor is triggered to alarm, and sends out a sound-light alarm signal to send out a warning.

The double-transmitting-receiving labyrinth has the advantages of reasonable structure, high detection sensitivity, high response speed, easiness in detection of micro particles generated during combustion of polyurethane synthetic furniture and good directivity. In addition, the optical maze uses light sources with two wavelengths, so that the sizes of particles entering the maze can be distinguished, and by means of the two wavelengths, the smoke sensor can distinguish different types of smoke and common interference sources, thereby improving the capability of eliminating the interference sources and avoiding false alarm of the smoke sensor.

It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.

Claims

1. An optical labyrinth smoke sensor, comprising: the LED light source comprises a concave plastic upper shell, a Y-shaped photoelectric transceiving diode support, a labyrinth base with a bulge structure and a metal insect-proof net, wherein one end of the Y-shaped support is provided with two LED cavities, and the other end of the Y-shaped support is provided with a photosensitive receiving tube cavity; the light-emitting diode cavity and the photosensitive receiving tube cavity are both arranged in an upward inclined mode, and the upward inclined angles of the two emitting tube cavities are the same; the support is arranged on the labyrinth base, the metal insect-proof net is sleeved outside the Y-shaped photoelectric transceiving diode support, and the labyrinth upper shell is detachably connected with the labyrinth base; the middle part of the inner surface of the top cover is provided with a recess, the outer side of the recess is provided with a plurality of first annular conical hammer-shaped toothed protrusions, the outer side of the conical hammer-shaped toothed protrusions is annularly provided with a plurality of herringbone fences to form a smoke inlet channel, and the outer side of the smoke inlet channel is provided with an annular surrounding bone.

2. The smoke sensor of claim 1 where the angle C between the two led cavities is 31 degrees and the angle D between the photoreceiver cavity and either led cavity is 164.5 degrees.

3. The smoke sensor of claim 1 where the angle E of the upward slope of both led cavities is 20.7 degrees; the angle F of the upward inclination of the cavity of the photosensitive receiving tube is 20 degrees.

4. The smoke sensor of claim 1 wherein the outer surface of the top cover of the labyrinth upper shell is provided with a "Y" shaped indicator.

5. The smoke sensor of claim 1 wherein two platforms are further provided inside said smoke inlet path.

6. The smoke sensor of claim 1 wherein a metal insect net is placed between said rail and said chevron-shaped barrier.

7. The smoke sensor as claimed in claim 1, wherein the middle of the "Y" shaped bracket is provided with a protrusion for shielding light, the protrusion has a groove in the middle, and the bottom of the bracket is provided with two positioning pins for facilitating the installation on the printed circuit board.

8. A smoke sensor according to claim 1 in which the surfaces of the three cavities are each provided with a fine matt finish to prevent reflections.

9. The smoke sensor as claimed in claim 1, wherein a plurality of second annular conical surface hammer-shaped tooth-shaped protrusions are arranged in the middle of the labyrinth base, and fine shining dumb veins are arranged on the surfaces of the second annular conical surface hammer-shaped tooth-shaped protrusions; the labyrinth base is provided with an eave-shaped structure for placing the Y-shaped photoelectric transceiving diode bracket.

10. The smoke sensor of any one of claims 1 to 9 wherein the labyrinth upper shell is snap-fit to the labyrinth base, the outer edge of the labyrinth upper shell being provided with a plurality of snaps; the outer edge of the labyrinth base is provided with a plurality of clamping holes.