Smoke sensing detection device

Abstract

The invention provides a smoke sensing detection device which comprises a shell. The smoke detector comprises a detection chamber, a smoke sensor and a smoke sensor; the light emitter and the receiver are located in the detection chamber; the separation blade assembly comprises a plurality of first separation blades which are arranged in the circumferential direction of the side wall of the detection chamber; the first blocking pieces are arranged opposite to the light emitter, and at least one of the first light blocking pieces is located in a light emitting path of the light emitter. The first separation blade is provided with a first prism, a second prism and a third prism which extend along the height direction of the detection chamber; the second prism is connected between the first prism and the third prism and is provided with a first surface, a second surface and a third surface connected between the first surface and the second surface, the first prism is provided with a fourth surface which is angularly adjacent to the first surface, and the third prism is provided with a fifth surface which is angularly adjacent to the second surface; the light of the illuminator reaching the first surface or the fourth surface is reflected between the first surface and the first prism; light of the light emitter reaching the second face or the fifth face is reflected between the second face and the fifth face.

Description

Technical Field

[0001] The present application relates to the technical field of smoke detection, and in particular to a smoke detection device. Background Art

[0002] Existing photoelectric smoke detection devices are usually constructed with a light emitter and a receiver. The light emitted by the light emitter is scattered into the receiver by smoke particles entering the detection chamber, and the photoelectric smoke detection device determines the smoke concentration based on the light received by the receiver. However, in the absence of smoke, the wall of the detection chamber itself will also reflect light to the receiver, thereby interfering with the detection result, resulting in the existing photoelectric smoke detection device usually having a high detection value in the absence of smoke, but low detection accuracy and sensitivity. Summary of the invention

[0003] The present application aims to provide a smoke detection device to solve or alleviate at least part of the problems mentioned in the background technology.

[0004] In order to achieve one of the aforementioned purposes, according to one aspect of the present application, a smoke detection device is provided, the smoke detection device comprising: a housing; and a smoke detector arranged in the housing, the smoke detector comprising: a detection chamber; a light emitter and a receiver arranged in the detection chamber; and a baffle assembly, the baffle assembly comprising a plurality of first baffles arranged circumferentially along the side wall of the detection chamber, the plurality of first baffles being arranged opposite to the light emitter, and at least one of the plurality of first baffles being in the light emission path of the light emitter; the first baffle is constructed with a plurality of first baffles extending in the height direction of the detection chamber; A first prism, a second prism and a third prism are extended; the second prism is connected between the first prism and the third prism, the second prism has a first face, a second face and a third face connected between the first face and the second face, the first prism has a fourth face adjacent to the first face at an angle, and the third prism has a fifth face adjacent to the second face at an angle; the light of the light emitter reaching the first face or the fourth face is reflected between the first face and the first prism; the light of the light emitter reaching the second face or the fifth face is reflected between the second face and the fifth face.

[0005] In addition to or as an alternative to one or more of the above features, in another embodiment, the second prism tapers from the bottom of the detection chamber toward the top of the detection chamber.

[0006] In addition to one or more of the above features, or as an alternative, in another embodiment, the angle between the third surface and the bottom of the detection chamber is between 85 degrees and 87 degrees.

[0007] In addition to one or more of the above features, or as an alternative, in another embodiment, the angle between the first surface and the bottom of the detection chamber is between 85 degrees and 87 degrees, and / or the angle between the second surface and the bottom of the detection chamber is between 85 degrees and 87 degrees.

[0008] In addition to one or more of the above features, or as an alternative, in another embodiment, the first prism tapers from the bottom of the detection chamber toward the top of the detection chamber, and the angle between the fourth surface and the bottom of the detection chamber is between 85 degrees and 87 degrees.

[0009] In addition to one or more of the above features, or as an alternative, in another embodiment, the third prism tapers from the bottom of the detection chamber toward the top of the detection chamber, and the angle between the fifth surface and the bottom of the detection chamber is between 85 degrees and 87 degrees.

[0010] In addition to one or more of the above features, or as an alternative, in another embodiment, in a cross section parallel to the top of the detection chamber, an angle between the third surface and the second surface is between 145 degrees and 160 degrees.

[0011] In addition to one or more of the above features, or as an alternative, in another embodiment, on the end surface of the first baffle facing the top of the detection chamber, the angle between the first surface and the fourth surface is between 115 degrees and 125 degrees.

[0012] In addition to one or more of the above features, or as an alternative, in another embodiment, on the end surface of the first baffle facing the top of the detection chamber, the angle between the second surface and the fifth surface is between 55 degrees and 65 degrees.

[0013] In addition to one or more of the above features, or as an alternative, in another embodiment, in a cross section parallel to the top of the detection chamber, the first prism is configured as a strip structure, and the second prism and the third prism extend from the middle of the strip structure toward the light emitter.

[0014] In addition to one or more of the above features, or as an alternative, in another embodiment, on the side of the third prism facing away from the second prism, the first baffle is configured with a recess having a zigzag cross-section between the third prism and the first prism.

[0015] In addition to one or more of the above features, or as an alternative, in another embodiment, the arrangement range of the plurality of first baffles at least covers an illumination range of the side wall of the detection chamber directly propagated by the light emitted by the light emitter.

[0016] In addition to one or more of the above features, or as an alternative, in another embodiment, the baffle assembly further includes a plurality of second baffles, the second baffles being configured with a fourth prism, a fifth prism and a sixth prism extending in the height direction of the detection chamber; the fifth prism being connected between the fourth prism and the sixth prism, the fifth prism having a first adjacent face, a second adjacent face and a third adjacent face connected between the first adjacent face and the second adjacent face, the fourth prism having a fourth adjacent face angularly adjacent to the first adjacent face, and the sixth prism having a fifth adjacent face angularly adjacent to the second adjacent face;

[0017] The light of the light emitter reaching the first adjacent surface or the fourth adjacent surface is reflected between the first adjacent surface and the fourth adjacent surface; the light of the light emitter reaching the second adjacent surface or the fifth adjacent surface is reflected between the second adjacent surface and the fifth adjacent surface.

[0018] In addition to one or more of the above features, or as an alternative, in another embodiment, the plurality of second baffles are adjacent to the plurality of first baffles and are circumferentially arranged on one side and / or both sides of the plurality of first baffles along the side wall of the detection chamber.

[0019] In addition to one or more of the above features, or as an alternative, in another embodiment, the plurality of first baffles are evenly arranged from one boundary of the irradiation range in a direction toward another boundary of the irradiation range, and a first baffle arranged at the boundary of the irradiation range is adjacent to at least one second baffle and the spacing between the first baffles and the adjacent second baffles is greater than or less than the spacing between every two adjacent first baffles.

[0020] In addition to one or more of the above features, or as an alternative, in another embodiment, the baffle assembly further includes at least one third baffle, the third baffle including a seventh prism, an eighth prism and a ninth prism; the eighth prism is connected between the seventh prism and the ninth prism, the eighth prism has a first adjacent surface and a second adjacent surface adjacent to each other, the seventh prism has a third adjacent surface adjacent to the first adjacent surface at an angle, and the ninth prism has a fourth adjacent surface adjacent to the second adjacent surface at an angle;

[0021] The light from the light emitter reaching the first abutting surface or the third abutting surface is reflected between the first abutting surface and the third abutting surface; the light from the light emitter reaching the second abutting surface or the fourth abutting surface is reflected between the second abutting surface and the fourth abutting surface.

[0022] In addition to one or more of the above features, or as an alternative, in another embodiment, the at least one third baffle is arranged circumferentially along the side wall of the detection chamber and is located at a boundary of a receiving range of the receiver for receiving light.

[0023] According to the smoke detection device of the present application, a plurality of light traps are formed by the angled arrangement between the three prisms of the first baffle, thereby significantly consuming the light directly irradiated onto the side wall of the detection room in the absence of smoke, reducing the background light received by the receiver, and lowering the detection value of the smoke detector in the absence of smoke, providing a larger measuring range corresponding to the change in smoke concentration for smoke detection, thereby improving the sensitivity and accuracy of smoke detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The disclosure of the present application will be more convenient to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application.

[0025] In the figure:

[0026] Figure 1 is an exploded schematic diagram of a smoke detection device according to an embodiment of the present application;

[0027] Figure 2 yes Figure 1 A three-dimensional diagram of the smoke guide bracket in FIG.

[0028] Figure 3 yes Figure 1 A cross-sectional view of a smoke detection device in FIG.

[0029] Figure 4 yes Figure 1 A cross-sectional view of the smoke detection device from another angle;

[0030] Figure 5 yes Figure 1 A cross-sectional view of the smoke detection device from another angle;

[0031] Figure 6 Shows Figure 1 A schematic diagram of the arrangement structure of the light emitter and the receiver of the smoke detection device;

[0032] Figure 7 Shows Figure 6 Schematic diagram of the light emitting and receiving range of the light emitter and receiver in the horizontal direction;

[0033] Figure 8 Shows Figure 6 Schematic diagram of the light emission range of the light emitter in the height direction;

[0034] Fig. 9Shows Figure 6 Schematic diagram of the light receiving range of the receiver in the height direction;

[0035] Fig.10 Shows Figure 1 A schematic diagram of the structure of the detection chamber of the smoke detector;

[0036] Fig.11 Shows Figure 1 A cross-sectional view of a smoke detector in FIG.

[0037] Fig.12 Shows Fig.10 An enlarged top view of the structure of the first baffle;

[0038] Fig.13 Shows Fig.12 A cross-sectional view of the first baffle in FIG.

[0039] Fig.14 Shows Fig.10 An enlarged top view of the structure of the second baffle;

[0040] Fig.15 Shows Fig.14 A cross-sectional view of the second baffle in FIG.

[0041] Fig.16 Shows Fig.10 An enlarged top view of the structure of the third baffle;

[0042] Fig.17 Shows Fig.16 A cross-sectional view of the third baffle in FIG.

[0043] Fig.18 Shows Fig.10 Schematic diagram of the arrangement of the baffle assembly in the detection chamber. DETAILED DESCRIPTION

[0044] The present application will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present application can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided here to make the disclosure of the present application more complete and clear, and to fully convey the concept of the present application to those skilled in the art.

[0045] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature displayed or implied in the accompanying drawings, it is easy for those skilled in the art to continue to make appropriate combinations or deletions between these technical features (or their equivalents), thereby obtaining more other embodiments of the present application that may not be directly mentioned in this document, and these embodiments do not deviate from the scope of the technical idea of ​​the present application.

[0046] Figure 1 It is a schematic diagram of a smoke detection device according to an embodiment of the present application. The smoke detection device mainly includes a housing 100, a smoke guide bracket 200 and a smoke detector 300. The housing 100 includes a main housing 110 and a top plate 120. An opening 1111 is configured in the middle of the upper surface 111 of the main housing 110, and the top plate 120 is arranged above the opening 1111 at a distance. The main housing 110 may include a base 113 and a surrounding portion 112 connecting the upper surface 111 and the base 113 for circumferentially covering other components. The smoke detector 300 is arranged in the main housing 110, and includes a detection chamber 310 and a circuit board 320 arranged on the base 360 ​​of the detection chamber, and a light emitter 330 and a receiver 340 electrically connected to the circuit board 320. The circuit board 320 can control the light emitter 330 to emit light, and convert the light information received by the receiver 340 into an electrical signal for data collection and processing. The light emitted by the light emitter 330 is scattered by smoke particles entering the detection chamber 310 and received by the receiver 340. The smoke detector 300 determines the smoke concentration based on the light received by the receiver 340 (for example, the magnitude of the dimming rate). The light emitter 330 includes a light emitting element 331 and a transmitting lens 332 electrically connected to the circuit board 320, and the receiver 340 includes a receiving element 341 and a receiving lens 342 electrically connected to the circuit board 320. The transmitting lens 332 and the receiving lens 342 are respectively installed in the lens bracket 350, and the lens bracket 350 is integrated with a transmitting tube 333 and a receiving tube 343 corresponding to the transmitting lens 332 and the receiving lens 342.

[0047] For ease of observation, Figure 2 An enlarged view of the smoke guide bracket 200 is shown, and Figure 2 Lieutenant General Figure 1 The smoke guide bracket 200 in the installation position is turned upside down at a certain angle. The smoke guide bracket 200 is arranged between the main housing 110 and the top plate 120, and has a smoke guide main plate 210 that is recessed from the edge of the top plate 120 toward the main housing 110. The smoke guide bracket 200 guides smoke from the gap between the smoke guide main plate 210 and the main housing 110 through the opening 1111 on the upper surface 111 of the main housing 110 into the smoke detector 300, for example Figure 5 The dotted arrow in the figure shows the direction in which smoke enters the gap between the smoke guide main board 210 and the main housing 110. The concave guiding design of the smoke guide main board 210 makes the pressure in the gap between the smoke guide main board 210 and the main housing 110 lower than the pressure in the external environment. The resulting pressure difference attracts smoke toward the inside of the main housing 110, plays a good guiding role and improves the smoke intake efficiency of the smoke detection device, thereby improving the response speed and detection sensitivity of the smoke detection device.

[0048] The following introduces further specific implementation or refinement and improvement process of the smoke guide bracket 200, so as to further improve its working efficiency, reliability or for other improvement considerations.

[0049] Depend on Figure 2 and Figure 5 It can be seen that the smoke guide main board 210 includes a circular central board 211 that abuts against the smoke detector 300 and an annular side board 212 that extends from the edge of the central board 211 toward the edge of the top board 120, that is, the annular side board 212 is configured in the shape of a side surface of a truncated cone structure. The central board 211 can provide a planar contact with the smoke detector 300, avoid collision damage to the smoke detector 300 by the concave smoke guide main board 210, and allow the smoke guide main board 210 to be more stably placed between the top board 120 and the smoke detector 300. The annular side board 212 under this arrangement has a certain inclination, such as Figure 5 The angle a indicated by the mark can be determined according to the size of the gap between the top plate 120 and the upper surface 111 of the main housing 110 and the diameter ratio of the top plate 120 to the base 113, for example, between 25 degrees and 35 degrees, preferably 29 degrees. Smoke can be guided into the smoke detector 300 along the inclined direction of the annular side plate 212 under the action of the pressure difference. Although Figure 2 The annular side plate 212 shown has a smooth surface, but in an optional embodiment, the surface of the annular side plate 212 may also have certain undulations to achieve different guiding effects.

[0050] Also like Figure 2 As shown, the smoke guide bracket 200 also includes a smoke guide main board 210 extending toward the main housing 110 (i.e., along the Figure 1The smoke guide plates 220 are provided between the annular side plate 212 and the smoke detector 300 and are evenly distributed along the circumference of the central plate 211, thereby playing a role in guiding smoke in all directions. By guiding the smoke radially from the outside to the inside of the fire detector, the circumferential swirl of the smoke is reduced, and the smoke intake efficiency of the fire detector is improved. The smoke guide plate 220 can be constructed as a right-angled triangle plate perpendicular to the plane where the central plate 211 is located. The first right-angled side 221 of the right-angled triangle plate extends radially along the central plate 211 and abuts against the smoke detector 300, the second right-angled side 222 is perpendicular to the central plate 211, and the hypotenuse 223 extends along the generatrix of the annular side plate 212. The angle between the first right-angled side 221 and the second right-angled side 222 is consistent with the inclination of the annular side plate 212. In an optional embodiment, the first right-angled side 221 of the smoke guide plate 220 may not extend radially along the central plate 211, or the smoke guide plate 220 may not be perpendicular to the central plate 211, but may be slightly inverted to the smoke guide main plate 210, thereby forming a shape similar to a fan blade. The smoke guide plate 220 may also be constructed into other triangular plate shapes or curved plates other than right-angled triangular plates to meet other smoke guiding requirements.

[0051] In an optional embodiment, if Figure 5 As shown, the edge of the top plate 120 may be constructed with a mounting portion 121 protruding toward the smoke guide bracket 200, and the mounting portion 121 and the smoke guide main board 210 of the smoke guide bracket 200 may be engaged by snap connection, threaded connection, etc. to provide a convenient assembly operation.

[0052] Figures 3 to 5 Shows Figure 1 The cross-sectional views of the smoke detection device at different angles are shown below. Figures 3 to 5 The working principle of the smoke detector 300 is described. First, Figure 3 As shown by the solid arrow, the light emitting element 331 of the light emitting device 330 emits light, and the light perpendicular to the upper surface 111 of the main housing 110 is changed to a direction parallel to the upper surface 111 of the main housing 110 by the emission lens 332 (for example, changed by 90 degrees), and then the light is focused and emitted from the emission tube 333. Then, as shown in FIG. Figure 4 As shown in FIG. 1 , the light emitted by the light emitter 330 can form a conical emission area (shown as a fan in the cross-sectional view), and the portion overlapping with the conical receiving area of ​​the receiver 340 is the detection area T. The light of the detection area T is scattered by smoke particles and enters the receiving area of ​​the receiver 340. Figure 5 As shown by the solid arrow, the light entering the receiving tube 343 changes the path of the light (for example, 90 degrees) through the receiving lens 342, and is received by the receiving element 341 after being focused. When the received light reaches the set threshold, a fire alarm is issued, for example Figure 1The light guide column 400 in the display is lit or flashing.

[0053] Figure 6 Shows Figure 1 FIG. 3 is a schematic diagram of the arrangement structure of the light emitter 330 and the receiver 340 of the smoke detection device. Figure 6 (a) shows a transmitting lens 332 , a receiving lens 342 , and a lens holder 350 for mounting the two, wherein the lens holder 350 has a transmitting tube 333 and a receiving tube 343 . Figure 6 (b) shows the lens holder 350 in which the transmitting lens 332 and the receiving lens 342 have been packaged. Figure 6 (c) shows Figure 6 (b) shows a lens holder 350 and a circuit board 320 on which a light emitting element 331 and a receiving element 341 are mounted. Figure 6 (d) shows the assembled light emitter 330 and receiver 340. The light emitter 330 and receiver 340 are designed in an integrated manner through the lens bracket 350, which can save the steps of adjusting the position and angle during installation, simplify the operation process, and improve the installation efficiency and layout accuracy.

[0054] Figure 7 A schematic diagram of the light emission and receiving range in the horizontal direction (i.e., the direction parallel to the upper surface 111 of the main shell 110) is shown, wherein the light emission angle range E1 is between 15° and 35°, the light receiving angle range R1 is between 45° and 65°, and the overlapping part of the light emission range and the receiving range is the detection area T. Figure 8 1 shows a schematic diagram of the light emission range in the height direction (ie, a direction perpendicular to the upper surface 111 of the main housing 110), wherein the light emission angle range E2 is between 15° and 35°. Fig. 9 FIG. 2 shows a schematic diagram of the light receiving range in the height direction, and the light receiving angle range R2 is between 45° and 65°. Figure 8 and Fig. 9 It can be seen that the transmitting lens 332 and the receiving lens 342 are configured to have a right triangle cross section with an angle of approximately 45°, thereby changing the direction of the light by 90°. Figure 8As shown, the side of the emitting lens 332 facing the detection chamber 310 is constructed with an emitting convex lens 3321 to focus the light emitted by the light emitting element 331. The distance J between the focusing point and the surface of the emitting convex lens 3321 can be relatively far, for example, close to or exceeding the length of the emitting tube 333. The emitting convex lens 3321 can converge the emitted light before emitting it, thereby reducing the loss of light in the emitting tube 333 and allowing most of the emitted light to propagate toward the middle of the side wall of the detection chamber 310, avoiding dispersion outside the side wall of the detection chamber 310, which is beneficial to the reflection consumption of light by the baffle (described in detail below) arranged near the side wall of the detection chamber 310, thereby effectively reducing the background light when there is no smoke. Fig. 9 As shown, a receiving convex lens 3421 is configured on one side of the receiving lens 342 facing the receiving element 341 to converge the received light and transmit it to the receiving element 341 , thereby improving the sensing accuracy of the receiving element 341 .

[0055] Fig.10 Shows Figure 1 A schematic diagram of the structure of the detection chamber 310 of the smoke detector 300, and Fig.11 Shows Figure 1 A horizontal cross-sectional view of the smoke detector 300 in FIG. Fig.10 and Fig.11 It can be seen that the smoke detector 300 is provided with a baffle assembly 500, which may include a plurality of first baffles 510 and a plurality of second baffles 520 and optionally a third baffle 530, for consuming and absorbing the light emitted by the light emitter 330 by reflection in the absence of smoke, thereby reducing the light (which may be called background light) received by the receiver 340 in the absence of smoke, and reducing the interference of the reflection of the detection chamber 310 itself on the detection result. Fig.11 In the embodiment, the baffle assembly 500 is arranged in a semicircle distribution opposite to the semicircle of the detection chamber 310 where the light emitter 330 and the receiver 340 are located. In an optional embodiment, the baffle assembly can also be arranged in a larger or smaller range. Among them, a plurality of first baffles 510 are arranged opposite to the light emitter 330, and at least one of the plurality of first baffles 510 is in the light emission path of the light emitter 330 for reflecting and absorbing light. In a preferred embodiment, the arrangement range of the plurality of first baffles 510 at least covers the irradiation range of the side wall of the detection chamber 310 where the light emitted by the light emitter 330 is directly transmitted. Outside the direct irradiation range, a second baffle 520 with a simpler structure than the first baffle 510 can be used to simplify the manufacturing process and reduce the manufacturing cost. It should be understood that the second baffle 520 may not be used, and all first baffles 510 may be used.

[0056] Combination Fig.10 , Fig.12 , 13It can be seen that the first baffle 510 is constructed with a first prism 511, a second prism 512 and a third prism 513 extending along the height direction of the detection chamber 310 (i.e., a direction perpendicular to the bottom of the detection chamber 310), the second prism 512 is connected between the first prism 511 and the third prism 513, and has a first surface 5121, a second surface 5122 and a third surface 5123 connected between the first surface 5121 and the second surface 5122. Among them, the first surface 5121 is adjacent to the fourth surface 5111 of the first prism 511 at an angle, and the second surface 5122 is adjacent to the fifth surface 5131 of the third prism 513 at an angle. Therefore, a light trap can be formed between the first surface 5121 and the fourth surface 5111. When the light of the emitter is directly irradiated (i.e., in the absence of smoke) to the first surface 5121 or the fourth surface 5111, the light can be repeatedly reflected between the first surface 5121 and the fourth surface 5111 for multiple times, thereby consuming the energy of the light. A light trap is also formed between the second surface 5122 and the fifth surface 5131 . When the light from the transmitter directly hits the second surface 5122 or the fifth surface 5131 , multiple transmissions may occur, thereby consuming the energy of the light and reducing the light reflected to the receiver 340 .

[0057] In a more specific embodiment, Fig.12 As shown, in a horizontal cross section (such as a cross section parallel to the top or bottom of the detection chamber 310), the angle between the first surface 5121 and the fourth surface 5111 can be between 115° and 125°, for example, 120°; the angle between the second surface 5122 and the fifth surface 5131 can be between 55° and 60°, for example, 57°; and the angle between the second surface 5122 and the third surface 5123 is between 145° and 160°. It can be seen that the bending design of the third surface 5123 and the second surface 5122 forms a concave space in the angle between the second prism 512 and the third prism 513, and the light propagating along the third surface 5123 of the second prism 512 to the fifth surface 5131 of the third prism 513 in the horizontal direction is reflected to the second surface 5122 of the second prism 512 by the fifth surface 5131, thereby entering the concave light trap between the second surface 5122 and the fifth surface 5131, thereby effectively reducing the background light.

[0058] In a preferred embodiment, the second prism 512 is configured to taper from the bottom of the detection chamber 310 toward the top of the detection chamber 310, thereby having a side surface that gradually slopes upward. For example, the third surface 5123 of the second prism 512 and the bottom of the detection chamber 310 have an angle between 85° and 87°, preferably 86° (e.g. Fig.10The angle b shown in FIG. 5 is a diagram showing an angle b shown in FIG. 5 . Since the third surface 5123 of the second prism 512 is tilted toward the receiver 340 in the horizontal direction, the light reflected by it is more likely to be received by the receiver 340. To avoid this, the light propagating to the third surface 5123 is reflected upward or downward through this tilt design, avoiding the light receiving range in the height direction of the receiver 340, thereby reducing the background light received by the receiver. In a preferred embodiment, the first surface 5121 and the second surface 5122 of the second prism 512 can also be designed to form an angle between 85° and 87° with the bottom of the detection chamber 310, preferably 86°.

[0059] In addition, the first prism 511 and the third prism 513 may also be configured to taper from the bottom of the detection chamber 310 toward the top of the detection chamber 310. For example, the fourth surface 5111 of the first prism 511 and the fifth surface 5131 of the third prism 513 may also be designed to form an angle between 85° and 87° with the bottom of the detection chamber 310, preferably 86°. Fig.13 The cross-sectional view of the first baffle 510 at AA in FIG. 5 schematically shows the inclination angle c of the fifth surface 5131 of the third prism 513. Through the tapered design, the light of the transmitter can be reflected away from the receiving range of the receiver 340.

[0060] The first baffle 510 of the present application forms a light trap at least on both sides of the second prism 512 through the angled arrangement between the three prisms, thereby significantly consuming the light irradiated onto the side wall of the detection chamber 310, reducing the light received by the receiver 340, and reducing the detection value of the smoke detector 300 in the absence of smoke, thereby providing a larger measuring range for smoke detection and improving the sensitivity and accuracy of smoke detection.

[0061] In addition, light can also be reflected between adjacent baffles to achieve light shielding and consumption, and through the adjacent arrangement of multiple first baffles 510, a light trap can also be formed between the third prism 513 of a first baffle 510 and the first prism 511 of the adjacent first baffle 510, thereby achieving further consumption and absorption of light.

[0062] In a preferred embodiment, Fig.12 and 13As shown, on the end face of the first baffle (or on the cross section parallel to the top of the detection chamber), the first prism 511 is configured as a strip structure with a relatively long extension length, and the second prism 512 and the third prism 513 extend from the middle of the length direction of the strip structure toward the light emitter, so that the three prisms as a whole form a structure with a cross section similar to a "K" shape. Furthermore, on the side of the third prism 513 facing away from the second prism 512, a notch 514 with a zigzag cross section can be configured between the first prism 511 and the third prism 513, for example Fig.12 The cross-section of the first prism 511 is a trapezoidal notch to further form a complex light trap. It should be understood that in other embodiments, the first prism 511 may also be shorter, for example, the first prism 511 does not continue to extend from the side of the third prism 513 facing away from the second prism 512. Fig.12 The angle ranges and shape details indicated in the figure are merely exemplary. In other implementations, some detail structures may be appropriately added or deleted or other angle ranges may be selected.

[0063] Fig.14 Shows Fig.10 An enlarged top view of the structure of the second baffle 520; Fig.15 Shows Fig.14 520. It can be seen that the structure of the second baffle 520 is similar to that of the first baffle 510, and is configured with three prisms extending along the height direction of the detection chamber 310: a fourth prism 521, a fifth prism 522, and a sixth prism 523. The fifth prism 522 is connected between the fourth prism 521 and the sixth prism 523, and has a first adjacent surface 5221, a second adjacent surface 5222, and a third adjacent surface 5223 connected between the first adjacent surface 5221 and the second adjacent surface 5222 (see Fig.15). The first adjacent face 5221 is adjacent to the fourth adjacent face 5211 of the fourth prism 521 at an angle, and the second adjacent face 5222 is adjacent to the fifth adjacent face 5231 of the sixth prism 523 at an angle. A light trap is formed between the first adjacent face 5221 and the fourth adjacent face 5211, a light trap is formed between the second adjacent face 5222 and the fifth adjacent face 5231, and a light trap is also formed between the third adjacent face 5223 and the fifth adjacent face 5231. Since the second baffle 520 is disposed on one side and / or both sides of the plurality of first baffles 510, that is, outside the direct irradiation range of the light emitter 330, the light intensity in the area where the second baffle 520 is located is lower than that in the area where the first baffle 510 is located. Therefore, for the purpose of simplifying processing and reducing costs, the structure of the second baffle 520 can be appropriately simplified. For example, the first adjacent surface 5221, the second adjacent surface 5222, the third adjacent surface 5223, the fourth adjacent surface 5211, and the fifth adjacent surface 5231 can only have an angle of about 89 degrees with the bottom of the detection chamber 310, so as to facilitate the demolding operation and to a certain extent reflect the light upward and downward. For example, Fig.15 A cross-sectional view taken at BB of the second blocking piece 520 is shown, and an inclination angle e of the fifth adjacent surface 5231 of the sixth prism 523 is indicated.

[0064] Optionally, the baffle assembly 500 may further include a third baffle 530. In a local area where reflected critical light may exist, for example, at a boundary of a receiving range of a receiver, the third baffle 530 may be provided to specifically eliminate the possible critical light. Fig.16 Shows Fig.10 The third baffle 530 is an enlarged top view of the structure, Fig.17 Shows Fig.16 530. It can be seen that the third baffle 530 includes a seventh prism 531, an eighth prism 532 and a ninth prism 533; the eighth prism 532 is connected between the seventh prism 532 and the ninth prism 533, the eighth prism 532 has a first adjacent surface 5321 and a second adjacent surface 5322 adjacent to each other, the seventh prism 531 has a third adjacent surface 5311 adjacent to the first adjacent surface 5321 at an angle, and the ninth prism 533 has a fourth adjacent surface 5331 adjacent to the second adjacent surface 5322 at an angle. The light of the light emitter reaching the first adjacent surface 5321 or the third adjacent surface 5311 is reflected between the two; the light of the light emitter reaching the second adjacent surface 5322 or the fourth adjacent surface 5331 is reflected between the two. Similar to the second baffle, the first abutting surface 5321, the second abutting surface 5322, the third abutting surface 5311, and the fourth abutting surface 5331 may only have an angle of about 89 degrees with the bottom of the detection chamber 310 to facilitate the mold removal operation and to reflect light upward and downward to a certain extent. Fig.17As shown, the inclination angle g of the first adjacent surface 5321 of the eighth prism 532 is indicated.

[0065] Fig.18 Shows Fig.10 Schematic diagram of the arrangement of the baffle assembly in the detection chamber in . It can be seen that in this embodiment, the plurality of first baffles 510 are evenly arranged along the circumference of the detection chamber 310, and the spacing between every two adjacent first baffles 510 is the same, for example, 13° apart. The plurality of second baffles 520 are evenly arranged along the circumference of the detection chamber 310 on one side or both sides of the plurality of first baffles 510, and the spacing between every two adjacent first baffles 510 is the same, for example, 13° apart. Adjacent first baffles 510 and second baffles 520 may also be spaced 13° apart, so that the plurality of first baffles 510 and the plurality of second baffles 520 are evenly distributed circumferentially as a whole. Or as Fig.18 As shown in the figure, at the boundary of the emission range of the light emitter, for example, the angle between the first baffle 510 and the second baffle 520 is 14°, so that the multiple first baffles 510 and the multiple second baffles 520 are unevenly distributed circumferentially as a whole to adapt to the complex optical reflection conditions at the boundary of the reflection range. Fig.18 A third baffle 530 located at the boundary of the receiving range of the receiver is also shown. It should be understood that in other embodiments, other numbers of first baffles 510, second baffles 520, and third baffles 530 may be used, and other suitable arrangements may be used, depending on factors such as the arrangement positions of the light emitter 330 and the receiver 340 and the light range intensity.

[0066] Tables 1-4 show the test data tables of the smoke detection device of the present application. Among them, the threshold value represents the dimming rate of the light emitter 330 caused by smoke. A threshold value of 0 represents the absence of smoke, and a larger threshold value represents a higher smoke concentration. The sampling data in Table 1 are the sampling values ​​related to the smoke concentration detected by the four smoke detection devices of the present application at various thresholds. The sampling value with a threshold value of 0 represents the sampling value of the background light when there is no smoke. The change of 0.35 can represent the change in the sampling value of the smoke detection device when the smoke concentration changes to 0.35. The larger the change, the more sensitive the device. It can be seen that the smoke detection device of the present application has a lower background light sampling value, and thus has a lower possibility of false alarms, and the change of 0.35 is larger, and has a higher sensitivity. Table 2 shows the test data when the fire occurs at different locations of the smoke detection device. It can be seen that the smoke detection device of the present application has good detection capabilities for fire situations in all locations. Table 3 shows the airflow sampling data, where the unfavorable orientation is the orientation corresponding to the second right-angled side 222 of the smoke guide bracket 200 and the smoke guide plate 220, and the favorable orientation is the orientation between the smoke guide plates 220, and two tests with airflow velocities of 0.2m / s and 1m / s were conducted on the two orientations. It can be seen that even if smoke enters in an unfavorable orientation, the smoke detection device of the present application still has a good detection effect. Table 4 shows a table of smoke detection alarm thresholds for several different combustibles. The lower the alarm threshold, the higher the sensitivity. It can be seen that the 8 smoke detection devices of the present application all have good alarm sensitivity.

[0067] Table 1. Smoke box smoke sampling test data table

[0068]

[0069] Table 2. Sampling test data of smoke entering from different directions

[0070]

[0071]

[0072] Table 3. Airflow test sampling data table

[0073]

[0074] Table 4. Fire sensitivity test alarm threshold (db / m)

[0075] Device No. Calibration threshold Smoldering wood fire Cotton rope smoldering fire Polyurethane Fire n-heptane fire Device 1 0.32 0.5 0.56 1.02 0.62 Device 2 0.35 0.45 0.61 1.01 0.82 Device 3 0.38 0.5 0.52 1.22 0.91 Device 4 0.40 0.59 0.48 1.10 0.94 Device 5 032 0.31 0.14 0.72 0.76 Device 6 0.35 0.29 0.19 0.61 0.78 Device 7 0.38 0.48 0.24 0.81 0.82 Device 8 0.40 0.81 0.27 1.22 0.92

[0076] The above examples mainly illustrate the smoke detection device of the present application. Although only some of the embodiments of the present application are described, it should be understood by those skilled in the art that the present application can be implemented in many other forms without departing from its subject matter and scope. Therefore, the examples and embodiments shown are regarded as illustrative rather than restrictive, and the present application may cover various modifications and substitutions without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A smoke detection device, characterized in that: The smoke detection device comprises: Housing; and A smoke detector is arranged in the housing, and the smoke detector comprises: Detection room; An emitter and a receiver disposed in the detection chamber; and A baffle assembly, the baffle assembly comprising a plurality of first baffles arranged circumferentially along a side wall of the detection chamber, the plurality of first baffles being arranged opposite to the light emitter, and at least one of the plurality of first baffles being in a light emission path of the light emitter; The first baffle is constructed with a first prism, a second prism and a third prism extending in the height direction of the detection chamber; the second prism is connected between the first prism and the third prism, the second prism has a first face, a second face and a third face connected between the first face and the second face, the first prism has a fourth face adjacent to the first face at an angle, and the third prism has a fifth face adjacent to the second face at an angle; The light of the light emitter reaching the first surface or the fourth surface is reflected between the first surface and the fourth surface; the light of the light emitter reaching the second surface or the fifth surface is reflected between the second surface and the fifth surface. 2 . The smoke detection device according to claim 1 , wherein the second prism tapers from the bottom of the detection chamber toward the top of the detection chamber. 3 .

3. The smoke detection device according to claim 2, characterized in that: The included angle between the third surface and the bottom of the detection chamber is between 85 degrees and 87 degrees.

4. The smoke detection device according to claim 3, characterized in that: The angle between the first surface and the bottom of the detection chamber is between 85 degrees and 87 degrees, and / or the angle between the second surface and the bottom of the detection chamber is between 85 degrees and 87 degrees.

5. The smoke detection device according to claim 2, characterized in that: The first prism tapers from the bottom of the detection chamber toward the top of the detection chamber, and an angle between the fourth surface and the bottom of the detection chamber is between 85 degrees and 87 degrees.

6. The smoke detection device according to claim 2, characterized in that: The third prism tapers from the bottom of the detection chamber toward the top of the detection chamber, and an angle between the fifth surface and the bottom of the detection chamber is between 85 degrees and 87 degrees.

7. The smoke detection device according to claim 1, characterized in that: In a cross section parallel to the top of the detection chamber, an angle between the third surface and the second surface is between 145 degrees and 160 degrees.

8. The smoke detection device according to claim 1, characterized in that: On the end surface of the first baffle facing the top of the detection chamber, an angle between the first surface and the fourth surface is between 115 degrees and 125 degrees.

9. The smoke detection device according to claim 1, characterized in that: On the end surface of the first baffle facing the top of the detection chamber, the angle between the second surface and the fifth surface is between 55 degrees and 65 degrees.

10. The smoke detection device according to any one of claims 1 to 9, characterized in that: In a cross section parallel to the top of the detection chamber, the first prism is configured as a strip structure, and the second prism and the third prism extend from a middle portion of the strip structure toward the light emitter.

11. The smoke detection device according to claim 10, characterized in that: On a side of the third prism facing away from the second prism, the first baffle is configured with a notch having a meandering cross section between the third prism and the first prism.

12. The smoke detection device according to any one of claims 2 to 9, characterized in that: The arrangement range of the plurality of first baffles at least covers the illumination range of the side wall of the detection chamber directly propagated by the light emitted by the light emitter.

13. The smoke detection device according to claim 12, characterized in that: The baffle assembly further includes a plurality of second baffles, wherein the second baffles are configured with a fourth prism, a fifth prism, and a sixth prism extending in a height direction of the detection chamber; the fifth prism is connected between the fourth prism and the sixth prism, the fifth prism has a first adjacent surface, a second adjacent surface, and a third adjacent surface connected between the first adjacent surface and the second adjacent surface, the fourth prism has a fourth adjacent surface adjacent to the first adjacent surface at an angle, and the sixth prism has a fifth adjacent surface adjacent to the second adjacent surface at an angle; The light of the light emitter reaching the first adjacent surface or the fourth adjacent surface is reflected between the first adjacent surface or the fourth adjacent surface; the light of the light emitter reaching the second adjacent surface or the fifth adjacent surface is reflected between the second adjacent surface and the fifth adjacent surface.

14. The smoke detection device according to claim 13, characterized in that: The plurality of second baffles are adjacent to the plurality of first baffles and are circumferentially arranged on one side and / or both sides of the plurality of first baffles along the side wall of the detection chamber.

15. The smoke detection device according to claim 14, characterized in that: The multiple first baffles are evenly arranged from one boundary of the irradiation range in a direction toward another boundary of the irradiation range, and a first baffle arranged at the boundary of the irradiation range is adjacent to at least one second baffle and the spacing between the first baffles and the adjacent second baffles is greater than or less than the spacing between every two adjacent first baffles.

16. The smoke detection device according to claim 12, characterized in that: The baffle assembly further comprises at least one third baffle, the third baffle comprising a seventh prism, an eighth prism and a ninth prism; the eighth prism is connected between the seventh prism and the ninth prism, the eighth prism has a first adjacent surface and a second adjacent surface adjacent to each other, the seventh prism has a third adjacent surface adjacent to the first adjacent surface at an angle, and the ninth prism has a fourth adjacent surface adjacent to the second adjacent surface at an angle; The light from the light emitter reaching the first abutting surface or the third abutting surface is reflected between the first abutting surface and the third abutting surface; the light from the light emitter reaching the second abutting surface or the fourth abutting surface is reflected between the second abutting surface and the fourth abutting surface.

17. The smoke detection device according to claim 16, characterized in that: The at least one third baffle is circumferentially arranged along the side wall of the detection chamber and is located at a boundary of a receiving range of the receiver for receiving light.

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