Smoke detector
By introducing an isolation mechanism into the smoke detector, the isolation component disconnects the smoke detector in case of a fault, thus solving the problem of the smoke detector failure affecting external wiring, realizing fault protection and automatic recovery functions, and reducing wiring difficulty.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU HIKFIRE TECH LTD
- Filing Date
- 2025-08-27
- Publication Date
- 2026-06-30
AI Technical Summary
A malfunction in the smoke-sensing mechanism of a traditional smoke detector can affect the operation of other components on the external wiring circuit, rendering it unusable.
A smoke detection device is designed, comprising a housing and a smoke detection mechanism, equipped with an isolation mechanism. The isolation component forms a conductive circuit with the smoke detection mechanism and is configured to disconnect when the current value exceeds a preset current value to prevent the fault from affecting the external circuit.
When a short circuit or overcurrent fault occurs in the smoke detection mechanism, the isolator automatically disconnects, protecting other components on the external wiring circuit from operating normally. After the fault is cleared, it automatically returns to normal operation, reducing wiring difficulty and the impact of the fault.
Smart Images
Figure CN224437015U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of fire protection equipment technology, specifically relating to a smoke detector. Background Technology
[0002] In today's society, fire safety is of paramount importance, and smoke detectors, as a key component of fire early warning systems, play an indispensable role.
[0003] However, traditional smoke detectors still have some drawbacks. The most significant one is that the smoke-detecting mechanism of the smoke detector is connected in series with the external wiring. When the smoke-detecting mechanism malfunctions, such as a short circuit or overcurrent, it will affect the operation of other components in the circuit where the smoke detector is located, causing other components to malfunction. Utility Model Content
[0004] The purpose of this application is to provide a smoke detection device that can solve the problem in related technologies where a malfunction in the smoke detection mechanism of a smoke detection device can affect the operation of other components in the circuit where the smoke detection device is located.
[0005] This application provides a smoke detector, including:
[0006] case;
[0007] The smoke-detecting mechanism is housed within the casing.
[0008] An isolation mechanism is connected to the housing. The isolation mechanism includes an isolation element, which is connected in series with an external wiring circuit. The isolation element and the smoke-detecting mechanism form a conductive circuit. The isolation element is configured to disconnect the isolation element and the smoke-detecting mechanism when the current value of the conductive circuit is greater than a preset current value.
[0009] In this embodiment, the smoke detector includes an isolation mechanism, which includes an isolating element connected in series with an external wiring circuit. The isolating element and the smoke detector form a conductive circuit, and the isolating element is configured to disconnect the isolating element and the smoke detector when the current value in the conductive circuit exceeds a preset current value. In actual use, when the smoke detector experiences a short circuit or overcurrent fault, the current value in the conductive circuit will exceed the preset current value. At this time, the isolating element will automatically disconnect from the smoke detector, thereby preventing the smoke detector from affecting the operation of other components on the external wiring circuit. Attached Figure Description
[0010] Figure 1 This is an explosion diagram of the smoke detector disclosed in the embodiments of this application;
[0011] Figure 2 This is a schematic diagram of the isolation mechanism disclosed in the embodiments of this application;
[0012] Figure 3 for Figure 2 An explosion diagram;
[0013] Figure 4 This is a schematic diagram of the structure of the conductive spring sheet disclosed in the embodiments of this application;
[0014] Figure 5 This is a schematic diagram of the isolation component disclosed in an embodiment of this application from one viewpoint;
[0015] Figure 6 This is a schematic diagram of the isolation component disclosed in an embodiment of this application from another perspective;
[0016] Figure 7 This is a schematic diagram of the structure of the seat disclosed in the embodiments of this application;
[0017] Figure 8 This is a partial cross-sectional view of the smoke-detecting device disclosed in the embodiments of this application;
[0018] Figure 9 This is one of the structural schematic diagrams of the smoke-detecting mechanism disclosed in the embodiments of this application;
[0019] Figure 10 This is a second schematic diagram of the smoke-detecting mechanism disclosed in the embodiments of this application;
[0020] Figure 11 This is the third schematic diagram of the smoke-detecting mechanism disclosed in the embodiments of this application;
[0021] Figure 12 for Figure 11 An explosion diagram;
[0022] Figure 13 This is one of the schematic diagrams illustrating the arrangement of the light-shielding plate disclosed in the embodiments of this application;
[0023] Figure 14 This is a second schematic diagram of the arrangement of the light-shielding plate disclosed in the embodiments of this application;
[0024] Figure 15 This is one of the schematic diagrams showing the arrangement of the transmitting element and the receiving element disclosed in the embodiments of this application;
[0025] Figure 16 This is a second schematic diagram illustrating the arrangement of the transmitting and receiving elements as disclosed in the embodiments of this application;
[0026] Figure 17 This is the third schematic diagram illustrating the arrangement of the transmitting and receiving elements as disclosed in the embodiments of this application;
[0027] Figure 18 This is a schematic diagram of the structure of the housing, baffle, and light guide column disclosed in the embodiments of this application;
[0028] Figure 19 This is one of the structural schematic diagrams of the shell body disclosed in the embodiments of this application;
[0029] Figure 20 This is the second schematic diagram of the shell body structure disclosed in the embodiments of this application;
[0030] Figure 21 This is a schematic diagram of the structure of the cover disclosed in the embodiments of this application.
[0031] Explanation of reference numerals in the attached figures:
[0032] 110-Shell, 111-Shell body, 1111-Air inlet, 112-Cover, 1121-Conductive part, 113-First cavity, 114-Second cavity, 115-Light emission mask, 116-Guide plate, 1161-Allowing space, 117-Baffle, 1171-Through hole, 118-Light guide column;
[0033] 200-Smoke detection mechanism, 210-First circuit board, 220-Outer shell, 221-Air inlet, 222-First chamber, 223-Second chamber, 224-Guide rib, 225-First shell section, 2251-First mounting channel, 2252-Second mounting channel, 226-Second shell section, 230-Light shield, 231-First sub-board, 232-Second sub-board, 240-Air inlet channel, 241-First sub-channel, 242-Second sub-channel, 250-Shielding cover;
[0034] 300-Isolation mechanism, 310-Base, 311-Drainage port, 312-Mounting groove, 320-Isolation component, 320a-Second circuit board, 321-First conductive area, 322-Second conductive area, 323-Third conductive area, 324-Fourth conductive area, 330-Conductive spring, 330a-First conductive spring, 330b-Second conductive spring, 331-First sub-part, 332-Second sub-part, 333-Mounting part, 3331-Toothed part;
[0035] 510 - First threaded connector, 520 - First pressing member, 530 - Second threaded connector, 540 - Second pressing member, 550 - Third threaded connector, 560 - Fourth threaded connector;
[0036] 610 - Transmitting element, 620 - Receiving element;
[0037] 710 - Drainage channel; 720 - First gap;
[0038] 800 - Mounting cavity. Detailed Implementation
[0039] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.
[0040] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0041] The smoke-detecting device provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.
[0042] Please refer to Figures 1 to 21 As shown in the figure, this application provides a smoke detection device, including: a housing 110, a smoke detection mechanism 200, and an isolation mechanism 300.
[0043] Specifically, the smoke-detecting mechanism 200 is disposed within the housing 110.
[0044] The isolation mechanism 300 is connected to the housing 110. The isolation mechanism 300 includes an isolation element 320, which is connected in series with the external wiring circuit. The isolation element 320 and the smoke detection mechanism 200 form a conductive circuit. The isolation element 320 is configured to disconnect the isolation element 320 and the smoke detection mechanism 200 when the current value of the conductive circuit is greater than a preset current value.
[0045] The isolator 320 includes, for example, a second circuit board 320a connected in series with an external circuit and forming a conductive loop with the smoke detector 200. The second circuit board 320a may be equipped with an overload protection element connected in series with the conductive loop. When the current in the conductive loop exceeds a preset current value, the overload protection element disconnects, thereby cutting off the conductive loop and disconnecting the isolator 320 and the smoke detector 200. Specifically, the overload protection element may include, for example, a field-effect transistor (FET).
[0046] It should be noted that when the isolator 320 and the smoke detector 200 are disconnected, the isolator 320 is normally connected in series on the external wiring circuit, and the external wiring circuit is still in a normal conductive state. The disconnection of the isolator 320 and the smoke detector 200 will not affect the operation of other components on the external wiring circuit.
[0047] In this embodiment, the smoke detector includes an isolation mechanism 300, which includes an isolating element 320 connected in series with an external wiring circuit. The isolating element 320 and the smoke detector 200 form a conductive circuit, and the isolating element 320 is configured to disconnect the isolating element 320 and the smoke detector 200 when the current value in the conductive circuit exceeds a preset current value. In actual use, when the smoke detector 200 experiences a short circuit or overcurrent fault, the current value in the conductive circuit will exceed the preset current value. At this time, the isolating element 320 will automatically disconnect from the smoke detector 200, thereby preventing the smoke detector 200 from affecting the operation of other components on the external wiring circuit. In addition, after the fault is cleared, the overload protection element automatically reconnects the isolating element 320 and the smoke detector 200 to allow the smoke detector 200 to return to normal operation.
[0048] Furthermore, in related technologies, the isolation mechanism 300 and the smoke detector are two independent components that require on-site wiring. However, in the solution provided in this application embodiment, the isolation mechanism 300 is part of the smoke detector. During the factory processing stage, the isolation mechanism 300 is pre-assembled with other components of the smoke detector, thus eliminating the need for on-site wiring and reducing the difficulty of wiring.
[0049] In one alternative implementation, refer to Figures 1 to 3 As shown, the isolation mechanism 300 also includes a seat 310, which is located on one side of the housing 110 and connected to the housing 110. The seat 310 is provided with a mounting cavity 800, and the isolation member 320 is located in the mounting cavity 800. That is, the mounting cavity 800 is formed solely by the seat 310.
[0050] In another embodiment, the isolation mechanism 300 further includes a seat 310, which is located on one side of the housing 110 and connected to the housing 110. The seat 310 and the housing 110 together form an installation cavity 800, and the isolation member 320 is located inside the installation cavity 800.
[0051] In this embodiment, the base 310 and the housing 110 together form the mounting cavity 800. Compared with the previous embodiment, where the mounting cavity 800 is formed solely by the base 310, the size of the base 310 can be set to be smaller in this embodiment, which helps to reduce the volume of the smoke detector.
[0052] In another embodiment, reference Figures 2 to 4 as well as Figure 21As shown, the housing 110 is provided with a conductive part 1121, which is electrically connected to the smoke detection mechanism 200. The isolation mechanism 300 also includes a conductive spring 330, which is in conductive contact with the isolation member 320. A portion of the conductive spring 330 is pressed onto the conductive part 1121. The conductive part 1121 acts as a conductive medium between the conductive spring 330 and the smoke detection mechanism 200 to realize the electrical connection between the two.
[0053] The conductive spring 330 is elastic. After actual assembly, under the elastic action of the conductive spring 330 itself, the conductive spring 330 and the conductive part 1121 maintain close contact, thereby making the electrical connection between the two more reliable.
[0054] In addition, when other components, such as the isolator 320 or the conductive part 1121, have processing errors and assembly errors, these errors can be compensated by causing the conductive spring 330 to undergo elastic deformation. This helps to reduce the processing difficulty of the smoke detector and can reduce the scrap rate of the smoke detector.
[0055] Optionally, refer to Figures 2 to 5 As shown, the conductive spring 330 includes, for example, a first sub-part 331 and a second sub-part 332. The isolator 320 includes the second circuit board 320a mentioned above. The first sub-part 331 is located between the second circuit board 320a and the base 310 and is in conductive contact with the second circuit board 320a. The second sub-part 332 is inclined relative to the first sub-part 331. One end of the second sub-part 332 is connected to the first sub-part 331, and the other end is pressed onto the conductive part 1121.
[0056] In other embodiments, a rigid conductive sheet may be used to replace the conductive spring 330 mentioned above.
[0057] In another embodiment, reference Figure 7 and Figure 8 As shown, the end face of the base 310 away from the housing 110 is provided with a drain port 311, and the housing 110 is provided with an air inlet 1111. The drain port 311 is connected to the air inlet 1111 through the inner cavity of the housing 110.
[0058] With the scheme of this embodiment, water is less likely to accumulate on the end face of the seat 310 away from the housing 110, and the liquid can be quickly discharged through the drain port 311. This helps to reduce the failure rate of the smoke detector, and with this setting, the smoke detector can be better suited for humid environments such as basements and pipe corridors.
[0059] Optionally, refer to Figure 8As shown, the seat 310 and the housing 110 together form a drainage channel 710, and there is a gap between the seat 310 and the housing 110 in the arrangement direction. For ease of description, this gap is defined as the first gap 720. (Refer to...) Figure 8 As shown, the drain port 311 is connected to the inner cavity of the housing 110 via the drain channel 710 and the first gap 720. It should be noted that the arrangement direction of the seat 310 and the housing 110 is, for example, as follows: Figure 8 The direction indicated by the dashed arrow line A in the diagram is... Figure 8 The solid arrows in the diagram all indicate the liquid discharge path.
[0060] In other embodiments, the seat 310 may not have a drain port 311.
[0061] In another embodiment, the conductive spring 330 is provided with a mounting portion 333, which extends along the arrangement direction of the base 310 and the housing 110. Both opposite sides of the mounting portion 333 are provided with toothed portions 3331, which are part of the mounting portion 333. The base 310 is provided with a mounting groove 312, and the mounting portion 333 is located within the mounting groove 312, with the toothed portions 3331 abutting against the sidewall of the mounting groove 312. The toothed portions 3331 are easily deformable, thus facilitating the installation of the mounting portion 333 within the mounting groove 312, and the deformed toothed portions 3331 can more reliably abut against the sidewall of the mounting groove 312.
[0062] Furthermore, by designing the shape of the toothed portion 3331, the deformability of the toothed portion 3331 in the direction from the housing 110 to the base 310 can be made greater than its deformability in the direction from the base 310 to the housing 110. This makes it more difficult for the mounting portion 333 to detach from the mounting groove 312, thereby improving the stability of the conductive spring 330. Specifically, the direction from the housing 110 to the base 310 is, for example, Figure 4 The direction indicated by arrow B in the diagram.
[0063] In other embodiments, both opposite sides of the mounting portion 333 may be planar structures.
[0064] In one alternative implementation, refer to Figure 4 As shown, the mounting portion 333 is, for example, a mounting plate, and its width gradually decreases along the direction from the housing 110 to the base 310. The direction from the housing 110 to the base 310, the width direction of the mounting plate, and the thickness direction of the mounting plate are all perpendicular to each other. The width direction of the mounting plate is, for example,... Figure 4The direction indicated by arrow C in the diagram. With this configuration, the mounting part 333 is roughly inverted cone-shaped, and during actual assembly, its narrower end is pre-inserted into the mounting groove. Then, guided by this end, the mounting part 333 can be easily and quickly installed into the mounting groove 312.
[0065] In another embodiment, reference Figure 18 and Figure 19 As shown, the peripheral sidewall of the end of the housing 110 away from the base 310 is recessed along the direction close to the axis of the housing 110, and is provided with at least two air inlets 1111. Each air inlet 1111 is arranged circumferentially around the housing 110. With this arrangement, the flue gas is concentrated at the end of the housing 110 away from the base 310 and enters the housing 110, thereby better meeting the air intake requirements of the end of the housing 110 away from the base 310.
[0066] In addition, setting the number of air inlets 1111 to at least two can increase the speed at which flue gas enters the housing 110. Furthermore, arranging the air inlets 1111 around the housing 110 at circumferential intervals facilitates the entry of flue gas from different directions into the housing 110, which helps to improve the accuracy of detection.
[0067] In other embodiments, the peripheral sidewall of the end of the housing 110 away from the base 310 may not be recessed, in which case the housing 110 is generally cylindrical. Furthermore, the number of air inlets 1111 may also be one.
[0068] In another embodiment, reference Figure 8 and Figure 18 As shown, a baffle 117 is provided inside the housing 110. The baffle 117 divides the inner cavity of the housing 110 into a first cavity 113 and a second cavity 114. The second cavity 114 is located away from the seat 310 and is connected to the air inlet 1111. The smoke sensing mechanism 200 is provided with an air inlet 221, which is located inside the second cavity 114. The baffle 117 is recessed towards the center of the second cavity 114.
[0069] Using the solution provided in this embodiment, the smoke first enters the second cavity 114, and then enters the smoke-sensing mechanism 200 through the air inlet 221. By making the baffle 117 recessed towards the center of the second cavity 114, the smoke can be guided to move away from the first cavity 113. This can better confine the smoke within the second cavity 114, reduce the diffusion of smoke into the first cavity 113, and thus increase the air intake speed of the smoke-sensing mechanism 200.
[0070] Furthermore, the peripheral sidewall of the end of the housing 110 away from the seat 310 is recessed in a direction close to the axis of the housing 110, so that the cavity wall of the second cavity 114 is recessed in a direction close to the axis of the housing 110, thereby facilitating the entry of flue gas into the second cavity 114.
[0071] Specifically, refer to Figure 8 As shown, a portion of the smoke-sensing mechanism 200 passes through the baffle 117 and extends into the second cavity 114, and this portion is provided with an air inlet 221. The other portion of the smoke-sensing mechanism 200 is located in the first cavity 113.
[0072] Optionally, refer to Figure 1 and Figure 8 As shown, the housing 110 includes, for example, a housing body 111 and a cover 112 disposed at one end of the housing body 111. The cover 112 is disposed facing the base 310 and together with the base 310 forms an installation cavity 800. A baffle 117 is located inside the housing body 111 and divides the inner cavity of the housing body 111 into a first cavity 113 and a second cavity 114. The first gap 720 mentioned above is connected to the first cavity 113. After the liquid enters the first cavity 113 through the first gap 720, it enters the second cavity 114 through the gap between the baffle 117 and the housing body 111, and finally exits through the air inlet 1111.
[0073] In other embodiments, the baffle 117 may also be a flat plate structure.
[0074] In another embodiment, reference Figure 2 and Figure 5 As shown, the isolator 320 is provided with a first conductive area 321 and a second conductive area 322. The isolation mechanism 300 also includes a first threaded connector 510, a first pressing member 520, a second threaded connector 530 and a second pressing member 540. One end of the first threaded connector 510 passes through the first pressing member 520 and the isolator 320 in sequence and is connected to the base 310. Under the action of the first threaded connector 510, the first pressing member 520 can press the first cable of the external line toward the first conductive area 321 so that the two are electrically connected.
[0075] One end of the second threaded connector 530 passes through the second pressing member 540 and the isolating member 320 in sequence and is connected to the seat 310. Under the action of the second threaded connector 530, the second pressing member 540 can press the second segment into the second conductive area 322 so that the two are electrically connected.
[0076] In actual use, the first cable is placed between the first pressing member 520 and the first conductive area 321. Then, the first threaded connector 510 is rotated to reduce the distance between the first pressing member 520 and the first conductive area 321. The first pressing member 520 then presses the first cable against the first conductive area 321. In this state, the first pressing member 520 and the isolating member 320 together clamp the first cable, preventing it from separating from the first conductive area 321, thus achieving the connection between the first cable and the smoke detector. The connection between the second cable and the smoke detector is similar and will not be described further. It is evident that this embodiment allows for the connection of the first and second cables of the external wiring to the smoke detector through a simple rotation operation, making the connection between the external wiring and the smoke detector relatively easy.
[0077] Specifically, the number of the first cable and the second cable are both two, for example. Correspondingly, the number of the first threaded connector 510, the first pressing member 520, the first conductive area 321, the second threaded connector 530, the second pressing member 540, and the second conductive area 322 are both two. The first cable, the first threaded connector 510, the first pressing member 520, and the first conductive area 321 correspond one-to-one, and the second cable, the second threaded connector 530, the second pressing member 540, and the second conductive area 322 correspond one-to-one. The two first cables are, for example, input cables, and the two second cables are, for example, output cables. The first cable and the second cable correspond one-to-one.
[0078] Optionally, the isolator 320 may include, for example, the second circuit board 320a mentioned above. One end of the first threaded connector 510 passes sequentially through the first pressing member 520 and the second circuit board 320a, and is connected to the base 310. One end of the second threaded connector 530 passes sequentially through the second pressing member 540 and the second circuit board 320a, and is connected to the base 310. The second circuit board 320a is provided with a first conductive region 321 and a second conductive region 322.
[0079] Further, refer to Figure 2 , Figure 4 as well as Figure 6 As shown, the isolation mechanism 300 may also include a third threaded connector 550 and a fourth threaded connector 560, the second circuit board 320a may also include a third conductive region 323 and a fourth conductive region 324, and there are two conductive springs 330. The conductive springs 330 correspond one-to-one with the conductive parts 1121. The two conductive springs 330 are the first conductive spring 330a and the second conductive spring 330b, respectively.
[0080] One end of the third threaded connector 550 passes sequentially through the second circuit board 320a and the first sub-part 331 of the first conductive spring 330a, and is connected to the base 310. Under the action of the third threaded connector 550, the third conductive region 323 and the first conductive spring 330a make conductive contact. One end of the fourth threaded connector 560 passes sequentially through the second circuit board 320a and the first sub-part 331 of the second conductive spring 330b, and is connected to the base 310. Under the action of the fourth threaded connector 560, the fourth conductive region 324 and the second conductive spring 330b make conductive contact. One of the third conductive region 323 and the fourth conductive region 324 is used for input signals, and the other is used for output signals.
[0081] In actual assembly, simply rotating the third threaded connector 550 can fix the first conductive spring 330a and make it electrically connected to the isolator 320. Simply rotating the fourth threaded connector 560 can fix the second conductive spring 330b and make it electrically connected to the isolator 320, thereby reducing the assembly difficulty of the smoke detector.
[0082] In other embodiments, the first cable can also be connected to the first conductive area 321 by soldering, and similarly, the second cable can also be connected to the second conductive area 322 by soldering.
[0083] In another embodiment, reference Figures 10 to 14 As shown, the smoke-sensing mechanism 200 includes a housing 220 and at least two light-shielding plates 230. The side wall of the housing 220 is provided with an air inlet 221. Each light-shielding plate 230 is located in the inner cavity of the housing 220 and is arranged sequentially around the axis of the housing 220. Each light-shielding plate 230 divides the inner cavity of the housing 220 into a first chamber 222 and a second chamber 223 arranged around the first chamber 222. The second chamber 223 is connected to the air inlet 221. An air intake channel 240 is formed between any two adjacent light-shielding plates 230, allowing smoke to enter the first chamber 222.
[0084] The first chamber 222 is used to detect flue gas. In this embodiment, the light shield 230 can block external light from entering the first chamber 222, thereby preventing external light from interfering with the detection of flue gas and improving the detection accuracy of flue gas.
[0085] Optionally, refer to Figure 12As shown, the outer casing 220 includes, for example, a first casing portion 225 and a second casing portion 226 connected together. The first casing portion 225 is disposed near the base 310, and the second casing portion 226 is provided with an air intake grille. The air intake grille has air intake holes 221, which can effectively block large particles such as insects. In addition, after the flue gas enters the second chamber 223, most of the dust in the flue gas will remain in the second chamber 223 under the action of gravity and electrostatic adsorption, thereby improving the detection effect of the flue gas and reducing false alarms caused by dust.
[0086] Optionally, refer to Figure 16 As shown, the second shell portion 226 is provided with at least two guide ribs 224, each guide rib 224 being located within the second chamber 223, and the guide ribs 224 are arranged at intervals along the circumference of the first chamber 222. The guide ribs 224 can guide the flue gas, thereby allowing for more precise control of the flue gas flow direction, which can shorten the time it takes for the flue gas to enter the first chamber 222. Specifically, refer to... Figure 16 As shown, the included angle between any two adjacent guide ribs 224 is, for example, 60°.
[0087] In other embodiments, the smoke-detecting mechanism 200 may also exclude the light-shielding plate 230.
[0088] In another embodiment, reference Figure 14 As shown, the air intake channel 240 includes a first sub-channel 241 and a second sub-channel 242 arranged at an angle. The second chamber 223, the first sub-channel 241, the second sub-channel 242, and the first chamber 222 are sequentially connected. This arrangement, with its bent shape, effectively blocks light. Furthermore, this configuration results in a simpler and more regular structure for the air intake channel 240, reducing the flow resistance of smoke entering the first chamber 222, thus shortening the hysteresis time of the smoke detector and improving its sensitivity.
[0089] Optionally, the intake passage 240 may include, for example, only a first sub-passage 241 and a second sub-passage 242 to further reduce the flow resistance of flue gas entering the first chamber 222. Specifically, refer to Figure 14 As shown, with this configuration, the air intake channel 240 is approximately herringbone in shape. More specifically, the sunshade 230 includes, for example, a first sub-plate 231 and a second sub-plate 232 arranged at an angle, with a first sub-channel 241 formed between two adjacent first sub-plates 231 and a second sub-channel 242 formed between two adjacent second sub-plates 232, and referenced... Figure 14 As shown, the included angle between two adjacent sub-plates is, for example, 13.8°.
[0090] In other embodiments, the intake passage 240 may also be a straight passage, in which case the axis of the intake passage 240 is a straight line.
[0091] In another embodiment, reference Figure 16 and Figure 17 As shown, the smoke detection mechanism 200 includes a housing 220, an emitting element 610, and a receiving element 620. The housing 220 has a first chamber 222 for detecting smoke. The emitting element 610 and the receiving element 620 are both located in the housing 220. The emitting element 610 can emit light of at least two different wavelengths into the first chamber 222, and the receiving element 620 can receive light of at least two different wavelengths reflected by the smoke in the first chamber 222.
[0092] The solution provided in this embodiment utilizes at least two different wavelengths of light to detect smoke. According to the Mie scattering theory, when the incident light wavelength, i.e., the wavelength of the light emitted by the emitting element 610, is greater than or close to the particle diameter, the change in the incident light wavelength has a significant impact on the scattered light intensity distribution. Conversely, when the incident light wavelength is much smaller than the particle diameter, the change in the incident light wavelength has a smaller impact on the scattered light intensity distribution. In other words, the solution provided in this embodiment distinguishes between fire particles and interfering particles by the difference in scattered light intensity at different wavelengths. This detection method has high accuracy, thereby reducing false alarms.
[0093] Furthermore, in this embodiment, one emitting element 610 can emit light of at least two different wavelengths, which reduces the number of emitting elements 610 and thus simplifies the structure of the smoke detection mechanism 200. Similarly, one receiving element 620 can receive light of at least two different wavelengths, which reduces the number of receiving elements 620 and thus also simplifies the structure of the smoke detection mechanism 200.
[0094] Optionally, refer to Figure 15 As shown, the first housing 225 mentioned above, for example, has a first mounting channel 2251 and a second mounting channel 2252. Both the first mounting channel 2251 and the second mounting channel 2252 are connected to the first chamber 222. The transmitting element 610 is located in the first mounting channel 2251, and the receiving element 620 is located in the second mounting channel 2252. The intersection of the axes of the first mounting channel 2251 and the second mounting channel 2252 is, for example, the center of the first chamber 222, to better detect the flue gas. Furthermore, the transmitting element 610 is, for example, interference-fitted with the first mounting channel 2251, and the receiving element 620 is, for example, interference-fitted with the second mounting channel 2252, and reference... Figure 16 As shown, the horizontal angle between the transmitting element 610 and the receiving element 620 is, for example, 124.8°. Figure 15 As shown, the vertical angle between the transmitting element 610 and the receiving element 620 is, for example, 129.8°.
[0095] Optionally, the emitting element 610 can emit at least red and blue light, and correspondingly, the receiving element 620 can receive at least red and blue light. More specifically, the wavelength of the red light is 940 nm, the wavelength of the blue light is 466 nm, and the wavelength range that the receiving element 620 can receive is 350 to 1150 nm. In actual use, the receiving element 620 distinguishes between fire particles and interference particles based on the difference between the red and blue light it receives.
[0096] Further, refer to Figure 12 As shown, the receiving element 620 is covered by a shield 250 to reduce external electromagnetic interference to the receiving element 620.
[0097] In other embodiments, the transmitting element 610 may also emit light of a single wavelength only into the first chamber 222, and similarly, the receiving element 620 may also receive light of a single wavelength only.
[0098] In another embodiment, reference Figure 8 , Figure 18 and Figure 19 As shown, the smoke-sensing mechanism 200 includes a first circuit board 210 and a housing 220. The housing 210 is provided with a light-emitting mask 115. At least a portion of the housing 220 is located between the first circuit board 210 and the light-emitting mask 115. The side of the first circuit board 210 facing the light-emitting mask 115 is provided with a light source module. A light guide post 118 is provided inside the housing 110. One end of the light guide post 118 is positioned towards the light source module, and the other end is in contact with the light-emitting mask 115.
[0099] In actual use, most of the light emitted by the light source module is transmitted to the light-emitting mask 115 via the light guide column 118. The setting of the light guide column 118 reduces light loss and improves light utilization. In addition, with this setting, the amount of light scattered into the housing 110 by the light source module is reduced. This portion of light will not interfere with the detection of flue gas, thereby reducing the impact of the light source module on flue gas detection.
[0100] Further, refer to Figure 20 As shown, the housing 110 is provided with at least two guide vanes 116, which are arranged circumferentially around the smoke sensing mechanism 200. The guide vanes 116 guide the flow of smoke, allowing the smoke to enter the smoke sensing mechanism 200 more quickly. Specifically, refer to... Figure 20 As shown, the included angle between any two adjacent guide vanes 116 is, for example, 60°.
[0101] Furthermore, refer to Figure 18 and Figure 20As shown, the housing 110 contains the aforementioned baffle 117, which has a through hole 1171. One end of the light guide column 118, away from the light source module, passes through the through hole 1171 and contacts the light-emitting mask 115. Additionally, the guide plate 116, for example, has a clearance space 1161, within which at least a portion of the light guide column 118 is located. This reduces the obstruction of the light guide column 118 to the flow of smoke, allowing the smoke to enter the smoke-sensing mechanism 200 more quickly.
[0102] In other embodiments, the smoke-detecting mechanism 200 may also exclude the light guide column 118.
[0103] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.
Claims
1. A smoke-detecting device, characterized in that, include: Casing (110); A smoke-detecting mechanism (200) is disposed within the housing (110); An isolation mechanism (300) is connected to the housing (110). The isolation mechanism (300) includes an isolation element (320), which is connected in series with an external wiring circuit. The isolation element (320) and the smoke-sensing mechanism (200) form a conductive circuit. The isolation element (320) is configured to disconnect the isolation element (320) and the smoke-sensing mechanism (200) when the current value of the conductive circuit is greater than a preset current value.
2. The smoke-detecting device according to claim 1, characterized in that, The isolation mechanism (300) further includes a seat (310), which is located on one side of the housing (110) and connected to the housing (110). The seat (310) and the housing (110) together form an installation cavity (800), and the isolation member (320) is located inside the installation cavity (800).
3. The smoke-detecting device according to claim 2, characterized in that, The housing (110) is provided with a conductive part (1121), which is electrically connected to the smoke-detecting mechanism (200). The isolation mechanism (300) further includes a conductive spring (330), which is in conductive contact with the isolation member (320), and a portion of the conductive spring (330) is pressed onto the conductive part (1121). And / or, the end face of the seat (310) away from the housing (110) is provided with a drain port (311), the housing (110) is provided with an air inlet (1111), and the drain port (311) is connected to the air inlet (1111) through the inner cavity of the housing (110).
4. The smoke-detecting device according to claim 3, characterized in that, The conductive spring (330) is provided with a mounting part (333), which extends along the arrangement direction of the base (310) and the housing (110). The mounting part (333) is provided with toothed parts (3331) on both opposite sides. The base (310) is provided with a mounting groove (312). The mounting part (333) is located in the mounting groove (312), and the toothed parts (3331) abut against the side wall of the mounting groove (312).
5. The smoke-detecting device according to claim 2, characterized in that, The peripheral sidewall of the housing (110) at the end away from the base (310) is recessed along the direction close to the axis of the housing (110) and is provided with at least two air inlets (1111), and each of the air inlets (1111) is arranged circumferentially around the housing (110). And / or, the housing (110) is provided with a baffle (117), the baffle (117) divides the inner cavity of the housing (110) into a first cavity (113) and a second cavity (114), the second cavity (114) is disposed away from the seat (310) and is connected to the air inlet (1111), the smoke sensing mechanism (200) is provided with an air inlet (221), the air inlet (221) is located in the second cavity (114), and the baffle (117) is recessed toward the center of the second cavity (114).
6. The smoke-detecting device according to claim 2, characterized in that, The isolating member (320) is provided with a first conductive area (321) and a second conductive area (322). The isolating mechanism (300) further includes a first threaded connector (510), a first pressing member (520), a second threaded connector (530), and a second pressing member (540). One end of the first threaded connector (510) passes through the first pressing member (520) and the isolating member (320) in sequence and is connected to the seat (310). Under the action of the first threaded connector (510) The first pressing member (520) can press the first cable of the external line towards the first conductive area (321) so that the two are electrically connected. One end of the second threaded connector (530) passes through the second pressing member (540) and the isolation member (320) in sequence and is connected to the seat (310). Under the action of the second threaded connector (530), the second pressing member (540) can press the second cable of the external line towards the second conductive area (322) so that the two are electrically connected.
7. The smoke-detecting device according to claim 1, characterized in that, The smoke-sensing mechanism (200) includes a housing (220) and at least two light-shielding plates (230). The side wall of the housing (220) is provided with an air inlet (221). Each of the light-shielding plates (230) is located in the inner cavity of the housing (220) and is arranged sequentially around the axis of the housing (220). Each of the light-shielding plates (230) divides the inner cavity of the housing (220) into a first chamber (222) and a second chamber (223) arranged around the first chamber (222). The second chamber (223) is connected to the air inlet (221). An air intake channel (240) is formed between any two adjacent light-shielding plates (230) to allow smoke to enter the first chamber (222).
8. The smoke-detecting device according to claim 7, characterized in that, The air intake channel (240) includes a first sub-channel (241) and a second sub-channel (242) arranged at an angle, and the second chamber (223), the first sub-channel (241), the second sub-channel (242) and the first chamber (222) are connected in sequence.
9. The smoke-detecting device according to claim 1, characterized in that, The smoke detection mechanism (200) includes a housing (220), an emitting element (610), and a receiving element (620). The housing (220) has a first chamber (222) for detecting smoke. The emitting element (610) and the receiving element (620) are both located in the housing (220). The emitting element (610) can emit light of at least two different wavelengths into the first chamber (222), and the receiving element (620) can receive light of at least two different wavelengths reflected by the smoke in the first chamber (222).
10. The smoke-detecting device according to claim 1, characterized in that, The smoke-sensing mechanism (200) includes a first circuit board (210) and a housing (220). The housing (110) is provided with a light-emitting mask (115). The housing (220) is located between the first circuit board (210) and the light-emitting mask (115). The side of the first circuit board (210) facing the light-emitting mask (115) is provided with a light source module. The housing (110) is provided with a light guide column (118). One end of the light guide column (118) is set towards the light source module, and the other end is in contact with the light-emitting mask (115).