CN210863533U

CN210863533U - Point type photoelectric smoke detector with same sensitivity for black smoke and white smoke

Info

Publication number: CN210863533U
Application number: CN201921766249.8U
Authority: CN
Inventors: 李金星; 严宝华; 安磊
Original assignee: Guotai Yi'an Electricity Co ltd Beijing
Current assignee: Guotai Yi'an Electricity Co ltd Beijing
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2020-06-26
Anticipated expiration: 2029-10-21

Abstract

The application provides a point type photoelectric smoke detector of same sensitivity of black cigarette white cigarette, includes: the detector comprises a detector upper cover, a labyrinth and a circuit board arranged in the labyrinth, wherein a patch light emitter and a patch light receiver are attached to the circuit board; the labyrinth is arranged in the upper cover of the detector; the labyrinth comprises a labyrinth cover and a labyrinth base clamped with the labyrinth cover, the top surface of the labyrinth cover is an insect-proof net, a light-emitting component and a light-receiving component are arranged in the labyrinth, and the light-emitting component finally forms a cone-shaped emission main light path with a light-emitting surface as a bottom surface; the light receiving assembly finally forms a cone-shaped receiving main light path taking the center of a light inlet surface of the light receiver as a cone top, and the area of the light inlet surface of the light receiving assembly, which can be irradiated by scattered light of the emitting main light path, is a smoke detection area. The smoke detection function with the same sensitivity of black smoke and white smoke can be realized by the single patch light emitter and the single patch light receiver.

Description

Point type photoelectric smoke detector with same sensitivity for black smoke and white smoke

Technical Field

The application relates to the technical field of smoke detection, in particular to a point type photoelectric smoke detector with the same sensitivity for black smoke and white smoke.

Background

At present, the point type photoelectric smoke detector is designed according to the principle that smoke particles scatter and reflect light. The method can be divided into a forward scattering type, a backward scattering type, a front and back combined bidirectional scattering type and a dual-band scattering type according to the detection principle. The forward scattering type has high sensitivity but is insensitive to black smoke, and cannot meet the requirement of the same sensitivity of black smoke and white smoke of a new national standard; although the response of the current back scattering to black and white smoke is better consistent, the maze smoke feeding is difficult, the direction is poorer, the size is larger, and the miniaturization is difficult to realize; the front and back combination of the bidirectional scattering type and the two-waveband scattering type can solve the problem of the same sensitivity of black smoke and white smoke, but the two infrared receiving tubes or the two infrared transmitting tubes are needed to be realized together with complicated data analysis and calculation, and the technology has complicated process, higher cost and poor reliability.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a point type photoelectric smoke detector of black cigarette with white cigarette sensitivity, this application smoke detector just can realize black cigarette, the same sensitivity of white cigarette with single paster light transmitter and paster photoreceiver, and it is smooth and easy to advance the cigarette, and the inside and outside smog concentration in the maze is unanimous under the different air current environment, does not have obvious position difference to can realize full paster ization, screwless, miniaturization and low cost.

In order to achieve the above object, the present application provides a point type photoelectric smoke detector with the same sensitivity for black smoke and white smoke, comprising: the detector comprises a detector and a detector base, wherein the detector is clamped on the detector base and comprises a detector upper cover, a labyrinth and a circuit board arranged in the labyrinth, and a patch light emitter and a patch light receiver are attached to the circuit board; the labyrinth is arranged in the upper cover of the detector; the light emitting module and the light receiving module are arranged in the labyrinth, and the light emitting module finally forms a cone-shaped emission main light path taking the light emitting surface as the bottom surface; the light receiving assembly finally forms a cone-shaped receiving main light path taking the center of the light inlet surface of the patch light receiver as a cone apex, and the area of the light inlet surface of the light receiving assembly, which can be irradiated by the emitting main light path, is a smoke detection area.

As above, the conical smoke guide device is convexly arranged from the top cover of the upper detector cover to the labyrinth direction, the conical top of the conical smoke guide device abuts against the central position of the insect-proof net, the peripheral wall of the conical smoke guide device extends to the inner wall direction of the upper detector cover to form a plurality of triangular separation blades, the triangular separation blades are uniformly arranged at intervals, a smoke inlet cavity is formed between the upper detector cover, two adjacent triangular separation blades, the peripheral wall of the conical smoke guide device and the insect-proof net, a smoke inlet hole is formed in the side wall of the upper detector cover, and the smoke inlet hole is communicated with the smoke inlet cavity.

As above, the light emitting assembly includes a light emitter shielding column, a light emitter light guide column and a light emitter light guide tube, two ends of the light emitter shielding column are respectively connected to the labyrinth cover and the circuit board, the light emitter light guide column is disposed inside the light emitter shielding column, the light emitter light guide column is disposed on the light emitting side of the patch light emitter, the light emitter light guide tube and the light emitter shielding column are integrally formed and disposed on the light emitting surface of the light emitter light guide column along the horizontal direction, and the light emitter light guide column is used for changing the transmission direction of light.

As above, the light receiving assembly includes a light receiver shading column, a light receiver light guiding column and a receiving light guiding pipe, two ends of the light receiver shading column are respectively connected with the labyrinth cover and the circuit board, the light receiver light guiding column is disposed inside the light receiver shading column, the light receiver light guiding column is disposed on the light receiving side of the patch light receiver, the receiving light guiding pipe is integrally formed with the light receiver shading column and is disposed at the light inlet surface of the light receiver light guiding column along the horizontal direction, and the light receiver light guiding column is used for changing the propagation direction of light.

As above, one end of the receiving light pipe away from the light-shielding column of the light receiver is a C-shaped light-shielding device, a through hole is axially formed in the C-shaped light-shielding device, the peripheral wall is a three-sided closed one-sided opening structure, and the opening direction faces the emission main light path.

As above, an included angle γ formed between the first light reflecting surface of the light emitter light guiding pillar and the second light reflecting surface of the light receiver light guiding pillar ranges from 105 degrees to 135 degrees.

The light absorbing and reflecting blades in the primary reflection region of the light trap region are right light absorbing and reflecting blades, and the right light absorbing and reflecting blades reflect and absorb the emitted light irradiated on the right light absorbing and reflecting blades to one side of the light emitting component; the light absorption and reflection blades of the secondary reflection area of the light trap area are leftward light absorption and reflection blades, and the leftward light absorption and reflection blades reflect and absorb emitted light irradiated on the leftward light absorption and reflection blades to one side of the light receiving component.

As above, the light guide column of the light emitter comprises a first light inlet surface, a first light reflecting surface and a first light outlet surface, the first light inlet surface is located on the bottom surface of the light guide column of the light emitter, the first light inlet surface is correspondingly arranged above the patch light emitter, the first light reflecting surface is obliquely arranged on the top surface of the light guide column of the light emitter, an included angle β between the first light reflecting surface and the circuit board is 40-60 degrees, the first light outlet surface is located on the side surface of the light guide column of the light emitter, the first light outlet surface is a spherical surface, and a light emitting guide pipe is arranged on the first light outlet surface.

As above, the light guide column of the light receiver includes a second light inlet surface, a second light reflecting surface and a second light outlet surface, the second light inlet surface is located on the side surface of the light guide column of the light receiver, the second light inlet surface is arranged along the vertical direction and is located near the light guide tube, the second light reflecting surface is obliquely arranged on the top surface of the light guide column of the light receiver, an included angle β between the second light reflecting surface and the circuit board is 40 degrees to 60 degrees, the second light outlet surface is arranged on the bottom surface of the light guide column of the light receiver, and the second light outlet surface is correspondingly arranged above the patch light receiver.

As above, wherein, be equipped with the pilot lamp on the circuit board, the edge of fly net is equipped with pilot lamp leaded light post, pilot lamp leaded light post perpendicular to fly net sets up, and the correspondence setting is in the top of pilot lamp, cover on the detector and be equipped with the leaded light post opening, the top of pilot lamp leaded light post stretches into in the leaded light post opening.

The beneficial effect that this application realized is as follows:

(1) this application uses a set of solitary light transmitter subassembly transmission light pipe and light receiver subassembly to receive the principle that the light pipe adopted the backscattering to make the change of different particle diameter signals not as sensitive as forward scattering, and the sensitivity of various cigarette will probably realize the homogenization relatively.

(2) This application adopts the special integrated chip of cigarette end, has reduced the circuit board area, and the effectual influence that reduces space radiation to amplifier circuit has improved the stability of signal, can realize the sampling of undercurrent high gain signal, for differential sampling, the integral operation provides the guarantee, makes the stability of detector reach a new height.

(3) The luminous intensity of steerable paster light emitter of this application realizes carrying out highlight and low light sampling in turn under same extinction coefficient (M) value, judges smog kind according to the sampling difference of the highlight under the same M value, low light, carries out data correction according to the characteristic of different smog again, realizes that black and white cigarette alarm sensitivity is the same.

(4) This application advances the cigarette smoothly, increases a paster temperature sensor on the circuit board, alright realize cigarette, temperature composite detector's all functions.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is an exploded schematic view of a point-type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of a point type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a point type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to an embodiment of the present invention.

Fig. 4 is a schematic view of a light emitter and light guide column structure of a point type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to an embodiment of the present invention.

Fig. 5 is a schematic view of the light receiver light guide pillar structure of the point type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to the embodiment of the present invention.

Fig. 6 is a schematic structural diagram of an optical receiver shielding column and a C-shaped shielding device of a point type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of a control circuit of a point type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to an embodiment of the present invention.

Fig. 8 is a flowchart of a detection method of a point-type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to an embodiment of the present invention.

Fig. 9 is a flow chart of sampling and alarm determination for a point-type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to an embodiment of the present invention.

Fig. 10 is an exploded view of a point-type photoelectric smoke detector with the same sensitivity for black smoke and white smoke according to another embodiment of the present invention.

Fig. 11 is a longitudinal sectional view of a point type photoelectric smoke detector having the same sensitivity to black smoke and white smoke according to another embodiment of the present invention.

Reference numerals: 1-detector upper cover; 2-maze; 3-a detector base; 4-a light-receiver shading column; 5-light emitter light guide column; 6-light receiver light guide column; 7-a circuit board; 8-a binding post; 9-a saw-tooth structure; 11-smoke inlet holes; 12-light guide post opening; 13-a conical smoke guide device; 21-a labyrinth base; 22-labyrinth cover; 23-left direction light absorbing reflective vanes; a 24-C shaped shade; 25-insect-proof net; 26-a clamping part; 27-a bump; 28-right light absorbing reflective vanes; 50-a first light inlet surface; 51-a first light-reflecting surface; 52-a first light-emitting surface; 61-a second light inlet surface; 62-a second light-reflecting surface; 63-a second light-emitting surface; 71-patch light emitter; 72-patch optical receiver; 73-indicator light; 74-indicator light guide post; 75-light emitter shading column; 76-an emission light pipe; 77-emission main optical path; 78-receiving the main light path; 79 — a first detection zone; 80-a second detection zone; 100-a signal acquisition element; 101-an amplifier; 102-an analog-to-digital conversion module; 103-a processor; 104-a voltage stabilizer; 1031-smoke and temperature detection control module; 1032-a light emitter control module; 1033-a microcontroller; 1034-IO control module; 1035-data storage.

Detailed Description

The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example one

As shown in fig. 1, a point-type photoelectric smoke detector with the same sensitivity for black smoke and white smoke comprises a detector and a detector base 3, wherein the detector is clamped on the detector base 3 and comprises a detector upper cover 1, a labyrinth 2 and a circuit board 7 arranged in the labyrinth 2, and a patch light emitter 71 and a patch light receiver 72 are attached to the circuit board 7; a cavity for accommodating the labyrinth 2 is formed between the upper detector cover 1 and the detector base 3, and the labyrinth 2 is positioned in the cavity; the labyrinth 2 comprises a labyrinth base 21 and a labyrinth cover 22, the labyrinth cover 22 is arranged on the detector upper cover 1, the labyrinth base 21 is arranged on the labyrinth cover 22, the circuit board 7 is arranged on the labyrinth base 21, the top surface of the labyrinth cover 22 is an insect-proof net 25, a light trap region capable of absorbing emitted light is arranged at a position irradiated by the emitted light, the light trap region is arranged on the inner side surface of the labyrinth base 21, a light emitting component and a light receiving component are arranged in the labyrinth 2, the light emitting component and the light receiving component are arranged on the circuit board 7, and the light emitting component forms a cone-shaped emission main light path 77 taking a light-emitting surface as a bottom surface; the light receiving component forms a cone-shaped receiving main light path 78 taking the center of a light inlet surface of the light receiver as a cone top; the area of the main emission light path 77 that can be irradiated on the light inlet surface of the light receiving component is the detection area of smoke.

Light emission subassembly is under the smokeless condition, the light of transmission is absorbed by the extinction subassembly on the maze lateral wall, thereby can not received by light receiving component, when smog, smog gets into the detection zone, smog produces the scattering effect to light, make the transmitted light that paster light emitter 71 sent transmit to light receiving component in, light receiving component detects the scattered light after, then can judge there is smog, can judge the concentration size of smog according to the power of received signal, the concentration of smog is big or small more, then received light signal is stronger.

As shown in fig. 1 and 2, the upper cover 1 of the detector is conical, the side part of the upper cover is provided with a plurality of smoke inlet holes 11 at uniform intervals along the circumferential direction, the top surface of the labyrinth cover 22 is provided with an insect-proof net 25, and the edge of the insect-proof net 25 is connected with the side wall of the labyrinth cover; the detector upper cover 1 is provided with a conical smoke guide device 13 protruding from the cover top to the direction of the insect-proof net 25, and the conical top of the conical smoke guide device 13 is abutted against the central position of the insect-proof net 25. The peripheral wall of the conical smoke guide device 13 extends towards the inner wall of the detector upper cover 1 to form a plurality of triangular separation blades which are uniformly arranged at intervals, a smoke inlet cavity is formed among the detector upper cover 1, two adjacent triangular separation blades, the peripheral wall of the conical smoke guide device 13 and the insect-proof net, and the smoke inlet hole 11 is communicated with the smoke inlet cavity. The smoke flowing into the detector from different directions can enter the smoke inlet cavity and is guided to the central part of the insect-proof net 25 by the conical smoke guiding device 13.

According to the utility model discloses an embodiment has seted up a plurality of apertures on the fly net 25, and smog can get into 2 mazes from the aperture in, then gets into 2 central detection positions in maze perpendicularly, improves the detection degree of accuracy. The insect net 25 also prevents small flying insects from entering the maze.

According to an embodiment of the present invention, the included angle δ formed between the conical surface of the conical smoke guiding device 13 and the plane of the insect-proof net 25 is 10 degrees to 60 degrees, the preferred range is 12 degrees to 45 degrees, and the most preferred range is 15 degrees to 30 degrees.

According to an embodiment of the present invention, the tapered smoke guiding device 13 and the triangular blocking piece at the edge are integrally formed with the upper cover of the detector, or can be separately manufactured.

For smoke, smoke can directly enter the detection area (the sum of the first detection area 79 and the second detection area 80) through the insect-proof net 25, and the wedge-shaped triangular smoke inlet cavity formed between the detector upper cover 1 and the labyrinth cover 22 can change the horizontal airflow into the vertical airflow under the condition that the airflow exists, so that the smoke can enter the central area of the detection area in the labyrinth without obstruction. Because the labyrinth is a horizontal plane top end smoke inlet structure, and the light guide column 5 of the light emitter in the labyrinth is in a light condensation mode, the labyrinth 2 can be made to be very thin, and the smoke inlet depth is reduced. The smooth smoke inlet effect and the low smoke inlet depth greatly improve the smoke response speed, the azimuth performance, the airflow interference resistance performance and the fire sensitivity experiment of the point type photoelectric smoke detector.

As shown in fig. 1-3, the light emitting assembly includes a light emitter shading column 75, a light emitter light guide column 5 and a light emitting guide tube 76, and the patch light emitter 71 is attached to the circuit board 7; the patch light emitter 71 is directly attached to the circuit board 7 in the process of producing the circuit board 7, manual installation of the patch light emitter 71 is not needed, labor cost and manual assembly time are reduced, and the light emitter shading column 75 is perpendicular to the circuit board 7 and is installed in a space between the circuit board 7 and the insect-proof net 25; the top and the labyrinth lid 22 butt of light emitter shading post 75, bottom and labyrinth base 21 butt prevent that the inside light of labyrinth 2 from getting into in the light emitter shading post 75, also prevent simultaneously that the light in the light emitter shading post 75 from getting into in the labyrinth 2, light emitter light guide post 5 sets up in light emitter shading post 75 to light emitter light guide post 5 sets up the luminescence side at paster light emitter 71. The emission light guide tube 76 is integrally formed with the light emitter shading column 75, and is disposed at the light exit surface of the light emitter light guide column 5 along the horizontal direction. The light emitter shading column 75 and the emitting light guide tube 76 are used for preventing the internal light and the external light from being wound in series, limiting and absorbing stray light emitted by the patch light emitter 71 to prevent the stray light from entering the interior of the labyrinth cavity, and the light emitter light guide column 5 is used for changing the light transmission direction and the light beam shape.

According to one embodiment of the present invention, the patch light emitter 71 emits infrared light.

According to an embodiment of the present invention, the light emitter shading column 75 is a column-type hollow light emitter shading column.

According to one embodiment of the present invention, the light emitter shading column 75 is integrally formed with the emission light pipe 76 and the labyrinth cover 22.

As shown in fig. 4, the light guide pillar 5 of the light emitter has a light guiding performance, and includes a first light inlet surface 50, a first light reflecting surface 51, and a first light outlet surface 52; the first light inlet surface 50 is located on the bottom surface of the light guide column 5 of the light emitter, the first light inlet surface 50 is correspondingly arranged above the patch light emitter 71, the first light reflecting surface 51 is obliquely arranged on the top surface of the light guide column 5 of the light emitter, the first light outlet surface 52 is arranged in the vertical direction, the first light outlet surface 52 is located on the side surface of the light guide column 5 of the light emitter, and the first light outlet surface 52 is a spherical surface; as shown in fig. 2, the emission light guide 76 is integrally formed on the light emitter shade bar 75, and the emission light guide 76 is disposed along the horizontal direction; the emission light guide 76 is disposed at the light emitting position of the first light emitting surface 52 perpendicular to the first light emitting surface 52. The light emitted by the patch light emitter 71 enters the light guide pillar 5 of the light emitter from the first light inlet surface 50, and then irradiates the first light reflecting surface 51, and the incident light is reflected to the first light outlet surface 52 through the first light reflecting surface 51.

According to an embodiment of the present invention, the first light emitting surface 52 is spherical, and has a focusing function to light, and light passes through the first light emitting surface 52 to form a cone-shaped emission main light path 77 or a parallel emission main light path with the first light emitting surface 52 as a base.

According to an embodiment of the present invention, the included angle β formed between the first reflective surface 51 and the circuit board 7 is 40 degrees to 60 degrees.

According to the utility model discloses an embodiment, be provided with convex lens in first play plain noodles 52 department, convex lens plays the effect of assembling to light, stray light is absorbed by black light emitter shading post 5 and transmission light pipe 76, the chief ray appears and uses lens as the end to just to the cone type transmission chief ray 77 to the left direction extinction reflection of light blade 23 on the maze lateral wall for the cone point, cone type transmission chief ray 77 has reduced the area of contact of transmission light with left direction extinction reflection of light blade 23 under the condition that does not reduce the quantity of light of subtracting the photometry. It is very advantageous to reduce the background light value.

As shown in fig. 1-3, the light receiving assembly includes a light-shielding column 4, a light-guiding column 6 and a receiving light-guiding tube, and the patch light receiver 72 is attached to the circuit board 7; the light receiver shading column 4 is vertical to the circuit board 7 and is arranged in the space between the circuit board 7 and the insect-proof net 25; the two ends of the light receiver shading column 4 are respectively connected with the labyrinth cover 22 and the circuit board 7, the light receiver light guide column 6 is arranged in the light receiver shading column 4, and the receiving light guide pipe and the light receiver shading column 4 are integrally formed; the receiving light pipe is arranged at the light inlet surface of the light receiver light guide column 6 along the horizontal direction. The light receiver shading column 4 and the receiving light guide pipe are used for preventing stray light inside the maze and light outside the maze from entering the light receiver light guide column 6, and the light receiver light guide column 6 is used for changing the light propagation direction and the light beam shape.

Preferably, the light receiver shielding column 4 is a cylindrical hollow light receiver shielding column.

As shown in fig. 5, the light receiver light guide column 6 has a light guide characteristic, and includes a second light inlet surface 61, a second light reflecting surface 62 and a second light outlet surface 63; the second light inlet surface 61 is positioned on the side surface of the light guide column 6 of the light receiver, and the second light inlet surface 61 is arranged along the vertical direction and is positioned close to the position for receiving the light guide tube; the second light reflecting surface 62 is obliquely arranged on the top surface of the light guide column 6 of the light receiver; the second light emitting surface 63 is disposed on the bottom surface of the light guiding pillar 6 of the light receiver, and the second light emitting surface 63 is correspondingly disposed above the patch light receiver 72. The smoke scattered light enters from the receiving light guide pipe, and then the smoke scattered light irradiates the second light reflecting surface 62 from the second light inlet surface 61, and the smoke scattered light is reflected to the second light emitting surface 63 through the second light reflecting surface 62.

According to the utility model discloses an embodiment, second goes out the plain noodles 63 and is globular, and on the smog scattered light shined paster photoreceiver 72 after the focusing action of second play plain noodles 63, paster photoreceiver 72 received the smog scattered light.

According to an embodiment of the present invention, the included angle β formed between the second reflective surface 62 and the circuit board 7 is 40 degrees to 60 degrees.

According to the utility model discloses an embodiment is provided with convex lens in second play plain noodles 63 department, and convex lens plays the effect of assembling to light, and stray light is absorbed by black light receiver shading post 4.

The patch light receiver 72 is used for detecting the smoke concentration, the second light inlet surface 61 of the light receiver light guide column 6 in the light receiver shading column 4 can not detect any light under the condition of no smoke, when smoke exists in the detection area, smoke particles scatter emitted light, and part of scattered light can irradiate the second light inlet surface 61 of the light receiver light guide column 6. The light entering the second light inlet surface 61 is reflected by the second light reflecting surface 62 and then exits from the convex lens at the bottom of the light guide column 6 of the light receiver. The convex lens converges the emitted light and irradiates the patch optical receiver 72. The patch optical receiver 72 converts the received optical signal into a current signal. The greater the smoke concentration, the stronger the optical signal received by the patch optical receiver 72 and the stronger the converted current signal.

According to the utility model discloses a further embodiment, change light receiver leaded light post 6 into the spotlight formula light conduction mode that light inlet area is greater than the light-emitting outlet area.

Preferably, the angle formed by the central axis of the transmitting light pipe 76 and the central axis of the receiving light pipe is 30 to 90 degrees.

As shown in fig. 3, the included angle γ formed between the first light reflecting surface 51 of the light emitter light guiding pillar 5 and the second light reflecting surface 62 of the light receiver light guiding pillar 6 is 60 degrees to 155 degrees, and according to the present invention, the value range of the γ angle is preferably 105 degrees to 135 degrees.

As shown in fig. 1-3 and fig. 6, a C-shaped light shielding device 24 is disposed at the position of receiving the light guide pipe, a through hole is disposed in the axial direction of the C-shaped light shielding device 24, the peripheral wall is three-sided closed, one side is open, and the opening direction is opened towards the emission main light path 77, that is, towards the light emitter shading column 75; the through hole is communicated with the receiving light pipe, and the receiving light pipe is in a hollow tubular shape. The three-sided closed perimeter wall of the C-shaped light shielding device 24 can effectively prevent background light and ambient light from entering the light receiver light guide column 6, thereby preventing the background light and the ambient light from entering the patch light receiver 72, and secondly, the detection light can enter the receiving light guide tube from the opening of the C-shaped light shielding device 24 without affecting the entrance of the detection light into the light receiver light guide column 6, so that the C-shaped light shielding device 24 can reduce the background light and the signal-to-noise ratio of the smoke signal.

The unabsorbed clean ambient light from the top of the maze is effectively blocked by the C-shaped light blocking device 24; stray light reflected from the light absorbing reflecting blades 23 is also effectively shielded by the C-shaped light shielding device 24; stray light reflected from the bottom or side of the labyrinth (except for the side directly opposite the receiving light pipe) is also effectively blocked. However, the effective detection area of the smoke is not reduced, as shown in fig. 3, the denser shadow area (i.e., the first detection area 79) in the figure is an effective detection area without the C-shaped light shielding device 24, and the less dense shadow area (i.e., the second detection area 80) in the figure is an effective detection area increased after the C-shaped light shielding device 24 is added, because one side of the C-shaped light shielding device 24 is an opening, the received light can enter the receiving light guide tube from the opening, so that the width of the receiving main light path 78 is increased, and the area of the detection area where the receiving main light path 78 intersects with the transmitting main light path 77 is increased.

As shown in fig. 3, in the condition where the C-shaped light shield 24 is not installed, the detection area is a first detection area 79; after the C-shaped light shield 24 is installed, the detection area is the sum of the first detection area 79 and the second detection area 80, so that the area of the detection area is increased after the C-shaped light shield 24 is installed, and the smoke detection effect is improved.

As shown in fig. 3, the labyrinth base 21 is divided into a circuit board mounting area for mounting the circuit board 7 and an optical trap area provided with a light absorbing member including a plurality of left light absorbing and reflecting blades 23 and a plurality of right light absorbing and reflecting blades 28. The light trap region is correspondingly disposed at a position where the emitted light emitted from the first light-emitting surface 52 of the light guide pillar 5 of the light emitter can be irradiated, and the emitted light is emitted by the patch light emitter 71. A straight line (i.e., L-shaped straight line in fig. 3) is drawn from the right inner midpoint of the junction of the light-receiving shade 4 and the light-receiving guide 24 through the inner vertex of the C-shaped shade 24 of the light-receiving guide 24. The upper side of the line L in fig. 3 is a secondary reflection region (e.g., region a in fig. 3), and the lower side of the line is a primary reflection region (e.g., region B in fig. 3). The emitted light irradiated to the primary reflection region is likely to enter the patch optical receiver 72 by the primary reflection; the emitted light striking the secondary reflective region must undergo at least a second reflection to be likely to enter the patch optical receiver 72; the primary reflection region (i.e., region B in fig. 3) is provided with a right light absorption/reflection blade 28, and the right light absorption/reflection blade 28 reflects the emitted light to the right side (light emitting assembly side); the secondary reflection region (i.e., region a in fig. 3) is provided with a left light absorbing and reflecting blade 23, and the left light absorbing and reflecting blade 23 reflects the emitted light toward the left side (light receiving element side).

As shown in fig. 3, the labyrinth base 21 includes a base side wall extending from the edge toward the labyrinth cover 22, the inner side of the base side wall is fixed with a plurality of right light-absorbing and reflecting blades 28 and a plurality of left light-absorbing and reflecting blades 23, an included angle α between the left light-absorbing and reflecting blades 23 and the right light-absorbing and reflecting blades 28 and a main optical axis of the emitted light irradiated on the surface is 105 degrees to 165 degrees, the emitted light emitted by the patch light emitter 71 is irradiated on the left light-absorbing and reflecting blades 23 and the right light-absorbing and reflecting blades 28 and then reflected on other light-absorbing and reflecting blades, other light-absorbing and reflecting blades can also absorb the light, and after multiple reflections and absorptions, the emitted light is absorbed, and thus cannot irradiate the second light inlet surface 61 of the light receiver light guide column 6.

As shown in fig. 1, be equipped with pilot lamp 73 on the circuit board 7, the edge of fly net 25 is equipped with pilot lamp leaded light post 74, pilot lamp leaded light post 74 perpendicular to fly net 25 sets up, and correspond the top that sets up at pilot lamp 73, be equipped with leaded light post opening 12 on the detector upper cover 1, the top of pilot lamp leaded light post 74 stretches into leaded light post opening 12 in, pilot lamp leaded light post 74 is used for guiding the pilot light of pilot lamp 73, the pilot light display state in the pilot lamp leaded light post 74 is observed to leaded light post opening 12 of permeable detector upper cover 1, when smog was reported to the police, pilot lamp 73 lights.

Preferably, the indicator light guide pillar 74 is a hollow column, and the indicator light guide pillar 74 is made of a material having good light transmittance. The indicator light guide post 74 is disposed within the cylindrical indicator light shade post.

Preferably, the labyrinth cover 22, the labyrinth base 21, the light emitter shielding column 75, the light receiver shielding column 4 and the columnar indicator light shielding column are all made of black opaque materials.

Preferably, the light emitter shade post 75, the light receiver shade post 4 and the pillar-shaped light shade post are tightly combined with the circuit board, so that external light cannot enter the light shade post, and light inside the light shade post cannot be exposed.

Two output pads of the circuit board 7 are respectively in electrical contact with a spring plate electrically connected with two binding posts 8 (shown in fig. 1), the binding posts 8 are installed on the detector base 3, and the binding posts 8 are connected with the controller through wires, so that detection signals can be transmitted to the controller, and instructions of the controller can be received.

As shown in fig. 1, the labyrinth cover 22 has a first side wall, and the labyrinth base 21 has a second side wall; after the labyrinth cover 22 is installed on the labyrinth base 21, a first side wall of the labyrinth cover 22 is wrapped outside a second side wall of the labyrinth base 21, a clamping part 26 is arranged on the first side wall, and a lug 27 is arranged on the second side wall; the protrusion 27 is engaged with the engaging portion 26 to limit the position between the labyrinth cover 22 and the labyrinth base 21, thereby preventing the relative rotation between the labyrinth cover 22 and the labyrinth base 21.

According to an embodiment of the present invention, the top of the labyrinth cover 22 is a plane, and a plurality of small holes with a diameter of 0.8-1 mm are opened on the plane.

According to an embodiment of the present invention, the labyrinth 2 and the labyrinth cover 22 are made of black light-absorbing plastic. The surface of the circuit board 7 is coated with black paint. The electronic elements are distributed below and around the transmitting light pipe and the receiving light pipe and are sprayed with black three-proofing paint.

For ambient light, the labyrinth 2 and the labyrinth cover 22 are made of black light-absorbing plastic, and the surface of the circuit board 7 is coated with black paint. The electronic components are distributed under and around the transmitting light pipe 76 and the receiving light pipe and are painted with black, three-proofing paint. Therefore, the ambient light cannot directly irradiate the inside of the labyrinth 2 under the shielding of the upper cover 1 and the labyrinth cover 22 of the detector, and even if a small amount of reflected light enters the labyrinth 3, the reflected light is absorbed and reflected many times by the black labyrinth bottom, the transmitting light pipe 76, the receiving light pipe, and the circuit board 7, so that the reflected light cannot reach the patch light receiver 72.

As shown in fig. 7, the core control device is arranged on the circuit board 7, and includes a signal acquisition element 100, an amplifier 101, an analog-to-digital conversion module 102, a processor 103, and a voltage stabilizer 104; the amplifier 101 is connected with the signal acquisition element 100, the analog-to-digital conversion module 102 is connected with the amplifier 101, the processor 103 is connected with the analog-to-digital conversion module 102, and the voltage stabilizer 104 is connected with the processor 103. The signal acquisition element 100 is used for acquiring a smoke signal, the amplifier 101 is used for amplifying the acquired smoke signal, the analog-to-digital conversion module 102 is used for converting the acquired analog signal into a digital signal and transmitting the digital signal to the processor 103, and the processor 103 is used for processing the digital signal. The processor 103 comprises a smoke and temperature detection control module 1031, a light emitter control module 1032, a microcontroller 1033, an IO control module 1034 and a data memory 1035; the smoke and temperature detection control module 1031 is connected with the analog-to-digital conversion module 102, the microcontroller 1033 is connected with the smoke and temperature detection control module 1031 and the light emitter control module 1032, the IO control module 1034 and the data memory 1035 are connected with the microcontroller 1033, the smoke and temperature detection control module 1031 is used for controlling smoke and temperature detection, the light emitter control module 1032 is used for controlling the light signal emitted by the patch light emitter 71 and controlling the luminous intensity of the patch light emitter 71, the IO control module 1034 is used for controlling input and output, the data memory 1035 is used for storing data processed by the processor 103, the integrated core control device effectively reduces the influence of space radiation on the amplification circuit, improves the stability of the signal, can realize small-current high-gain signal sampling, and provides guarantee for differential sampling and integral operation.

According to an embodiment of the invention, the detector base 3 comprises a recess adapted to receive the labyrinth base 21.

According to the utility model discloses an embodiment is provided with paster temperature sensor on the circuit board, and temperature sensor realizes surveying ambient temperature's effect.

Example two

As shown in fig. 10, the present invention provides another point-type photoelectric smoke detector with the same sensitivity for black smoke and white smoke.

Compared with the first embodiment, the point type photoelectric smoke detector is only different from the first embodiment in that the detector upper cover 1 and the detector base 3 are different, the detector upper cover 1 is substantially cylindrical, and compared with the first embodiment, the size of the detector upper cover 1 and the detector base 3 is smaller, so that the cost is reduced, and is only two thirds of the cost of the first embodiment.

As shown in fig. 11, the labyrinth base 21 is provided with a saw-toothed structure 9 in a region located on the non-circuit board. When the unabsorbed clean ambient light from the top of the maze irradiates the bottom of the maze, the black maze bottom absorbs the light first, and the light which is absorbed unclean is reflected by the inclined planes of the saw teeth of the saw tooth structure 9 to the end far away from the patch light receiver 72 and is absorbed by the black maze shell continuously. This is advantageous for enhancing the ambient light interference resistance of the detector.

EXAMPLE III

As shown in fig. 8, the present invention provides a method for detecting a point-type photoelectric smoke detector with the same sensitivity for black smoke and white smoke; the method comprises the following steps:

step S1, sampling, setting a sampling period for collecting smoke signals, uniformly distributing the total sampling time in the sampling period into a plurality of sub-sampling periods, and carrying out sampling once in each sub-sampling period; so as to filter the influence of the power frequency radiation on the signal.

Wherein the collected smoke signal is the concentration of smoke.

Wherein the sampling period is 1-10 seconds, and the sampling period is adjusted according to the smoke concentration. The total sampling time of one sampling period is 20 milliseconds of the period of the power frequency 50 HZ. The total sampling time is divided into sub-sampling periods, which are 0.3125 ms to 10 ms, preferably 0.62 ms to 5 ms, and more preferably 1.25 ms to 2.5 ms.

Step S2, judging whether the sampled data exceed the early warning value, if yes, executing step S3, if not, executing pollution compensation judgment processing, and then returning to continue executing S1 sampling;

wherein the early warning value is a preset smoke concentration value, and specifically, the early warning value is set to be 0.15dBm^-1。

And if so, executing compensation correction to correct the sampling data so as to compensate errors caused by the dust in the detector.

And step S3, judging the smoke type, and correspondingly correcting the fire alarm value according to the smoke type.

Wherein the fire alarm value is greater than the early warning value.

As shown in fig. 9, step S3 includes the following sub-steps:

step S310, starting a strong light and weak light alternative sampling mode, and collecting smoke concentration data;

step S320, judging whether the sampling data is similar to the paraffin smoke model or not, and if so, correcting the paraffin fire sampling value of the sampling data; if not, go to step S330;

specifically, for the same cigarette, two sampling data are respectively obtained under the conditions of strong light irradiation and weak light irradiation, the obtained two sampling data are subtracted to obtain a difference value, the corresponding relation between the sampling data and the difference value of the cigarette is stored in a paraffin model in advance, and whether the tested cigarette is the cigarette is judged by judging whether the difference value corresponding to the sampling data falls into the difference value range of the paraffin model. The paraffin smoke is white smoke, and the back scattering type photoelectric smoke detector has good consistency on black smoke test fire and white smoke test fire, but has certain difference on a plurality of specific test fires. Therefore, in order to further ensure the same sensitivity for black smoke and white smoke, the type of the test fire needs to be determined. The fire alarm value of the detection smoke which alarms relatively late is properly reduced; the fire alarm value of the smoke with relatively early alarm is properly improved, so that the alarm sensitivity of different types of smoke is kept consistent. Therefore, the paraffin fire sampling value is corrected for the sampling data, so that the sensitivity of the detector for detecting paraffin smoke reaches a better average value.

Step S330, judging whether the sampling data is similar to the cotton rope smoke model, and if so, correcting the cotton rope fire sampling value of the sampling data; if not, go to step S340;

whether the sampling data are similar to the cotton rope smoke model or not is judged, if yes, the cotton rope smoke is tested, the fire alarm value is adjusted, and the sensitivity of the detector for detecting the cotton rope smoke reaches a better average value.

Step S340, judging whether the sampling data is similar to the wood smoke model or not, and if so, correcting the wood fire sampling value of the sampling data; if not, go to step S350;

judging whether the sampling data is similar to the wood smoke model or not, if so, determining that the test is wood smoke, and adjusting the fire alarm value to enable the sensitivity of the detector for detecting the wood smoke to reach a better average value.

Step S350, judging whether the sampling data is similar to the polyurethane smoke model or not, if so, correcting the polyurethane fire sampling value of the sampling data, and if not, executing step S360;

and judging whether the sampling data is similar to the polyurethane smoke model or not, if so, determining that the test is polyurethane smoke, and adjusting the fire alarm value to ensure that the sensitivity of the detector for detecting the polyurethane smoke reaches a better average value.

And step S360, judging whether the sampling data is similar to an n-heptane smoke model, if so, correcting the n-heptane fire sampling value of the sampling data, and if not, executing step S370.

And judging whether the sampling data is similar to the n-heptane smoke model or not, if so, determining that the test is the n-heptane smoke, and adjusting the fire alarm value to enable the sensitivity of the detector for detecting the n-heptane smoke to reach a better average value.

Comparing the sampling data with different kinds of smoke models, judging whether the sampling data is similar to a certain smoke model, if the sampling data is similar to a certain smoke model, judging that the smoke type is the kind of the smoke model similar to the certain smoke model, and then correcting the fire alarm value by adopting a sampling value correction method of the smoke of the kind. The sampling data is compared with the corrected fire alarm value, so that the alarm is more accurate, and the phenomena of false alarm and missed alarm are prevented.

Step S3 further includes, if the sampled data is not similar to the smoke model, executing step S370, and performing forced alarm condition determination, that is, determining whether the sampled data meets the forced alarm condition, if so, alarming, otherwise, executing the interference removal process. The forced alarm condition judgment is a step executed when the data of the type of smoke generated by the sampling data cannot be detected, in an actual environment, sometimes a plurality of types of smoke are mixed together, when the plurality of types of smoke are mixed together, the type of smoke cannot be detected, the forced alarm condition judgment needs to be executed, namely whether the sampling data reaches the concentration range of forced alarm is judged, if so, forced alarm is carried out, otherwise, an interference removal process is executed.

And step S4, judging whether the sampling data exceeds the corrected fire alarm value, if so, performing fire alarm, and if not, ending the process.

The beneficial effect that this application realized is as follows:

(3) The luminous intensity of the controllable light emitter can be controlled, strong light and weak light alternate sampling can be achieved under the same dimming coefficient (M), the smoke type can be judged according to the sampling difference value of the strong light and the weak light under the same M, data correction can be conducted according to the characteristics of different smoke, and the same black-white smoke alarm sensitivity can be achieved.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should fall within the patent coverage of the present invention.

Claims

1. The utility model provides a same point type photoelectric smoke detector of sensitivity of black cigarette white cigarette which characterized in that includes: the detector comprises a detector and a detector base, wherein the detector is clamped on the detector base and comprises a detector upper cover, a labyrinth and a circuit board arranged in the labyrinth, and a patch light emitter and a patch light receiver are attached to the circuit board; the labyrinth is arranged in the upper cover of the detector; the light emitting module and the light receiving module are arranged in the labyrinth, and the light emitting module finally forms a cone-shaped emission main light path taking the light emitting surface as the bottom surface; the light receiving assembly finally forms a cone-shaped receiving main light path taking the center of the light inlet surface of the patch light receiver as a cone apex, and the area of the light inlet surface of the light receiving assembly, which can be irradiated by the scattered light of the emitting main light path, is a smoke detection area.

2. The point type photoelectric smoke detector with the same sensitivity as black smoke and white smoke according to claim 1, wherein the detector upper cover is convexly provided with a conical smoke guide device from the cover top to the labyrinth direction, the conical top of the conical smoke guide device abuts against the central position of the insect-proof net, the peripheral wall of the conical smoke guide device extends towards the inner wall direction of the detector upper cover to form a plurality of triangular separation blades, the triangular separation blades are uniformly arranged at intervals, a smoke inlet cavity is formed between the detector upper cover, two adjacent triangular separation blades, the peripheral wall of the conical smoke guide device and the insect-proof net, the side wall of the detector upper cover is provided with a smoke inlet, and the smoke inlet is communicated with the smoke inlet cavity.

3. The spot type photoelectric smoke detector of the same sensitivity as black smoke and white smoke of claim 1, wherein the light emitting component comprises a light emitter shielding column, a light emitter light guide column and a light emitter light guide pipe, two ends of the light emitter shielding column are respectively connected with the labyrinth cover and the circuit board, the light emitter light guide column is arranged inside the light emitter shielding column, the light emitter light guide column is arranged on the light emitting side of the patch light emitter, the light emitter light guide pipe and the light emitter shielding column are integrally formed and arranged at the light emitting surface of the light emitter light guide column along the horizontal direction, and the light emitter light guide column is used for changing the propagation direction of light.

4. The spot type photoelectric smoke detector according to claim 3, wherein the light receiving assembly comprises a light receiver shielding column, a light receiver light guiding column and a receiving light guiding pipe, two ends of the light receiver shielding column are respectively connected to the labyrinth cover and the circuit board, the light receiver light guiding column is disposed inside the light receiver shielding column, the light receiver light guiding column is disposed on a light receiving side of the patch light receiver, the receiving light guiding pipe is integrally formed with the light receiver shielding column and is disposed at a light inlet surface of the light receiver light guiding column along a horizontal direction, and the light receiver light guiding column is used for changing a propagation direction of light.

5. The spot type photoelectric smoke detector according to claim 4, wherein an end of the receiving light pipe away from the light-receiving-unit shielding column is a C-shaped light-shielding device, the C-shaped light-shielding device has an axial through hole, and a peripheral wall of the C-shaped light-shielding device has a structure with three faces closing one face and an opening, wherein the opening is oriented toward the main emission light path.

6. The spot type photoelectric smoke detector with the same sensitivity as the black smoke and white smoke of claim 4, wherein an included angle γ formed by the first light reflecting surface of the light emitter light guide column and the second light reflecting surface of the light receiver light guide column ranges from 105 degrees to 135 degrees.

7. The spot type photoelectric smoke detector according to claim 1, wherein the light absorbing and reflecting blades of the primary reflection region of the light trap region are right light absorbing and reflecting blades, and the right light absorbing and reflecting blades reflect and absorb the emitted light irradiated thereon to one side of the light emitting element; the light absorption and reflection blades of the secondary reflection area of the light trap area are leftward light absorption and reflection blades, and the leftward light absorption and reflection blades reflect and absorb emitted light irradiated on the leftward light absorption and reflection blades to one side of the light receiving component.

8. The point type photoelectric smoke detector with the same sensitivity as black smoke and white smoke of claim 3, wherein the light emitter light guide column comprises a first light inlet surface, a first light reflecting surface and a first light outlet surface, the first light inlet surface is located on the bottom surface of the light emitter light guide column, the first light inlet surface is correspondingly arranged above the patch light emitter, the first light reflecting surface is obliquely arranged on the top surface of the light emitter light guide column, an included angle β between the first light reflecting surface and the circuit board is 40-60 degrees, the first light outlet surface is located on the side surface of the light emitter light guide column, the first light outlet surface is spherical, and the first light outlet surface is provided with an emission light guide pipe.

9. The point type photoelectric smoke detector with the same sensitivity as the black smoke and white smoke of claim 4, wherein the light receiver light guide column comprises a second light inlet surface, a second light reflecting surface and a second light outlet surface, the second light inlet surface is located on the side surface of the light receiver light guide column, the second light inlet surface is arranged along the vertical direction and is located close to the receiving light guide pipe, the second light reflecting surface is obliquely arranged on the top surface of the light receiver light guide column, an included angle β between the second light reflecting surface and the circuit board is 40-60 degrees, the second light outlet surface is arranged on the bottom surface of the light receiver light guide column, the second light outlet surface is correspondingly arranged above the patch light receiver, and the second light outlet surface is spherical.

10. The point type photoelectric smoke detector with the same sensitivity as black smoke and white smoke according to claim 1, wherein an indicator light is arranged on the circuit board, an indicator light guide column is arranged at the edge of the insect-proof net, the indicator light guide column is arranged perpendicular to the insect-proof net and correspondingly arranged above the indicator light, a light guide column opening is arranged on the detector upper cover, and the top end of the indicator light guide column extends into the light guide column opening.