Fire detector and ship fire-fighting monitoring system
By using light sources of different wavelengths and monitoring sensors on ships to identify smoke particles, the problem of identifying ship fires in the early stages was solved, timely warnings were achieved during the pyrolysis and smoldering stages, and fire losses were reduced.
Patent Information
- Application Number
- CN202422769931.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-11-13
AI Technical Summary
The space on the ship is narrow, the smoke concentration is high, and the visibility is low. Fires are difficult to detect in the early stages and can easily lead to chain fires. Existing technologies make it difficult to provide timely warnings during the pyrolysis and smoldering stages.
An emitter is used to emit light sources of different wavelengths (less than 500nm and greater than 800nm) into the smoke sensing optical darkroom. Combined with monitoring sensors to monitor temperature and humidity, smoke particles and interference particles are identified through light scattering characteristics to improve fire identification accuracy.
It achieves timely early warning during the pyrolysis and smoldering stages, improves the accuracy and timeliness of fire identification, and reduces fire losses.
Smart Images
Figure CN223320902U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of fire monitoring technology, and specifically relates to a fire detector and a ship fire monitoring system. Background Art
[0002] Ships are characterized by cramped spaces, high smoke density, low visibility, and difficulty detecting early-stage fires, which can easily trigger chain fires. Combustible combustion can be broadly divided into three stages: pyrolysis, smoldering, and open flames. The pyrolysis and smoldering stages are characterized by the release of large quantities of smoke particles. Providing timely warnings during these stages is crucial for preventing fires and minimizing losses. Utility Model Content
[0003] Purpose of the utility model: The embodiment of the present application provides a fire detector, aiming to solve the above-mentioned technical problems; another purpose of the present application is to provide an assembly method applied to the above-mentioned fire detector.
[0004] Technical solution: A fire detector according to an embodiment of the present application includes:
[0005] The housing comprises a first housing portion and a second housing portion that are detachably connected, wherein the first housing portion and the second housing portion enclose a receiving cavity, and at least one of the first housing portion and the second housing portion is provided with a smoke inlet;
[0006] A smoke detection housing is provided in the accommodating cavity, and the smoke detection housing has a smoke optical darkroom connected to the smoke inlet;
[0007] a detection assembly connected to the smoke detection housing, the detection assembly comprising a transmitter and a receiver, the transmitter being configured to emit a first light source and a second light source toward the smoke-sensing optical darkroom, the wavelength of the first light source being less than 500 nm, and the wavelength of the second light source being greater than 800 nm, and the receiver being configured to receive the light source emitted by the transmitter when the smoke concentration in the smoke-sensing optical darkroom exceeds a threshold value;
[0008] A monitoring sensor is provided in the accommodating cavity, and the monitoring sensor is configured to monitor at least one of temperature and humidity.
[0009] In some embodiments, the smoke detection shell includes a third shell portion and a fourth shell portion that are detachably connected, and a groove is provided on the side of the third shell portion facing the fourth shell portion. The fourth shell portion and the groove form the smoke sensing optical darkroom, and the groove has a bottom wall and a side wall surrounding the bottom wall, and the bottom wall and the side wall are respectively provided with a plurality of ridges for reflecting light sources.
[0010] In some embodiments, the transmitter has a light source emitting end facing the smoke sensing optical darkroom, and the receiver has a light source receiving end facing the smoke sensing optical darkroom. The light source emitting end and the light source receiving end are located in the same plane, and the direction in which the light source emitting end emits the light source and the direction in which the light source receiving end receives the light source have an angle.
[0011] In some embodiments, the fourth shell portion has a first fixing seat and a second fixing seat, and the first fixing seat and the second fixing seat are both provided with fixing holes, the fixing holes connecting the accommodating cavity and the smoke optical darkroom, the transmitter is inserted into the fixing hole of the first fixing seat, and the receiver is inserted into the fixing hole of the second fixing seat.
[0012] In some embodiments, the fire detector further includes a circuit board, which is disposed in the accommodating cavity and located on a side of the fourth shell portion facing away from the third shell portion, and the transmitter, the receiver, and the monitoring sensor are respectively connected to the circuit board;
[0013] The fourth shell portion further has a positioning post extending toward the circuit board. The circuit board is provided with a positioning hole, and the positioning post is inserted into the positioning hole.
[0014] In some embodiments, a plurality of smoke inlets are provided on the outer peripheral side of the first shell portion, and the plurality of smoke inlets are spaced apart around the first shell portion.
[0015] In some embodiments, the fire detector further includes an insect-proof net, and the insect-proof net cover is provided at the smoke inlet.
[0016] In some embodiments, the shell and the insect-proof net are both made of metal.
[0017] In some embodiments, one of the first shell portion and the second shell portion has a protrusion, and the other shell portion is provided with a recess for inserting the protrusion, and the protrusion is threadedly connected to an inner wall of the recess.
[0018] In some embodiments, the first light source is blue light, and the second light source is infrared light.
[0019] In some embodiments, the fire detector further includes a mounting base, which is provided on a side of the second shell portion facing away from the first shell portion. The mounting base is provided with a plurality of mounting holes, and the plurality of mounting holes are spaced around the second shell portion.
[0020] Accordingly, a ship fire monitoring system described in an embodiment of the present application includes the above-mentioned fire detector.
[0021] Beneficial effects: A fire detector according to an embodiment of the present application includes a shell, a smoke detection shell, a detection assembly, and a monitoring sensor. The shell includes a first shell portion and a second shell portion that are detachably connected, the first shell portion and the second shell portion enclose a receiving cavity, and at least one of the first shell portion and the second shell portion is provided with a smoke inlet. The smoke detection shell is arranged in the receiving cavity, and the smoke detection shell has a smoke-sensing optical darkroom connected to the smoke inlet; the detection assembly is connected to the smoke detection shell, and the detection assembly includes a transmitter and a receiver, and the transmitter is configured to emit a first light source and a second light source toward the smoke-sensing optical darkroom, the wavelength of the first light source is less than 500nm, and the wavelength of the second light source is greater than 800nm, and the receiver is configured to receive the light source emitted by the transmitter when the smoke concentration in the smoke-sensing optical darkroom exceeds a threshold value. The monitoring sensor is arranged in the receiving cavity, and the monitoring sensor is configured to monitor at least one of temperature and humidity. The first light source and the second light source are emitted intermittently and periodically into the smoke-sensing optical darkroom through the transmitter. When a fire occurs, the particle size of the smoke particles produced by pyrolysis and smoldering is generally less than 500nm, while the particle size of interfering particles such as dust in the air is generally greater than 1000nm. When the wavelength of the light source is greater than or close to the particle size of the particles, the change in the wavelength of the light source has a greater influence on the distribution of scattered light intensity. Therefore, the first light source and the second light source are emitted intermittently. As the smoke concentration increases, the smoke particles diffusely reflect the first light source and the second light source until the receiver receives the light source. The wavelengths of the first light source and the second light source change greatly, the intensity of the scattered light from the particles changes greatly, and the light signal value received by the receiver changes greatly, which is conducive to timely detection of the occurrence of fire. When the wavelength of the light source is smaller than the particle size, the change in the wavelength of the light source has little effect on the distribution of scattered light intensity. The wavelengths of the first light source and the second light source are generally smaller than the particle size of interfering particles such as dust in the air. Therefore, although the wavelengths of the first light source and the second light source change greatly, the scattered light intensity of interfering particles such as dust changes little, and the light signal value received by the receiver changes little. Emitting the first light source and the second light source through the transmitter is conducive to accurately identifying the smoke particles generated by the fire and the interfering particles in the air, thereby improving the accuracy of fire identification. In addition, by setting up a monitoring sensor to synchronously sense at least one of the temperature and humidity, the accuracy of the fire detector is further improved, which is conducive to timely detection and prevention of fire, thereby reducing losses. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0023] Figure 1 This is a schematic structural diagram of a fire detector according to an embodiment of the present application;
[0024] Figure 2 It is a schematic diagram of a partial cross-sectional structure of a housing according to an embodiment of the present application;
[0025] Figure 3 This is a schematic diagram of the explosion structure of the fire detector according to an embodiment of the present application;
[0026] Figure 4 This is a structural diagram of the fourth shell portion from one perspective of an embodiment of the present application;
[0027] Figure 5 This is a structural diagram of the third shell portion from one perspective of an embodiment of the present application;
[0028] Figure 6 This is a schematic structural diagram of the fourth shell portion from another perspective of the embodiment of the present application;
[0029] Figure 7 This is a structural diagram of the second shell portion from one perspective of an embodiment of the present application;
[0030] Figure markings: 1. shell; 10. first shell part; 100. recess; 11. second shell part; 110. convex part; 111. mounting base; 1110. mounting hole; 12. accommodating chamber; 13. smoke inlet; 2. smoke detection shell; 20. smoke sensing optical darkroom; 21. third shell part; 210. groove; 2100. bottom wall; 2101. side wall; 211. ridge; 22. fourth shell part; 220. first fixing seat; 221. second fixing seat; 222. fixing hole; 223. positioning column; 3. detection assembly; 30. transmitter; 300. light source transmitting end; 31. receiver; 310. light source receiving end; 4. monitoring sensor; 5. circuit board; 50. positioning hole; 6. insect net; 7. plug. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.
[0032] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.
[0033] Reference Figures 1 to 7 A fire detector includes a shell 1, a smoke detection shell 2, a detection component 3 and a monitoring sensor 4.
[0034] The housing 1 comprises a first shell portion 10 and a second shell portion 11 that are detachably connected. The first and second shell portions 10, 11 define a housing chamber 12, and at least one of the first and second shell portions 10, 11 is provided with a smoke inlet 13. A smoke detector housing 2 is disposed within the housing chamber 12 and includes a smoke-sensing optical darkroom 20 connected to the smoke inlet 13. A detection assembly 3 is connected to the smoke detector housing 2 and includes a transmitter 30 and a receiver 31. The transmitter 30 is configured to emit a first light source and a second light source toward the smoke-sensing optical darkroom 20. The wavelength of the first light source is less than 500 nm, and the wavelength of the second light source is greater than 800 nm. The receiver 31 is configured to receive the light emitted by the transmitter 30 when the smoke concentration within the smoke-sensing optical darkroom 20 exceeds a threshold. A monitoring sensor 4 is disposed within the housing chamber 12 and is configured to monitor at least one of temperature and humidity.
[0035] Transmitter 30 periodically transmits a first light source and a second light source into the smoke-sensing optical darkroom 20 at intervals. When a fire occurs, the particle size of smoke particles produced by pyrolysis and smoldering is generally less than 500 nm, while the particle size of interfering particles such as dust in the air is generally greater than 1000 nm. When the wavelength of the light source is greater than or close to the particle size, changes in the wavelength significantly affect the distribution of scattered light intensity. Therefore, by transmitting the first and second light sources at intervals, as smoke concentration increases, smoke particles diffusely reflect the first and second light sources until they are received by receiver 31. This significantly changes the wavelengths of the first and second light sources, the intensity of light scattered by the particles, and the optical signal value received by receiver 31, facilitating timely detection of fire.
[0036] When the wavelength of the light source is smaller than the particle size, the change in the wavelength of the light source has little effect on the distribution of scattered light intensity. The wavelengths of the first light source and the second light source are generally smaller than the particle size of interfering particles such as dust in the air. Therefore, although the wavelengths of the first light source and the second light source change greatly, the scattered light intensity of interfering particles such as dust changes little, and the light signal value received by the receiver 31 changes little, thereby identifying the influence of interfering particles such as dust in the air.
[0037] The emission of the first and second light sources by transmitter 30 facilitates accurate identification of smoke particles generated by a fire and interfering particles in the air, thereby improving the accuracy of fire identification. Furthermore, the provision of monitoring sensor 4 for simultaneous sensing of at least one of temperature and humidity further improves the accuracy of the fire detector, facilitating timely detection and prevention of fires, thereby reducing losses. Specifically, this embodiment may employ a temperature and humidity sensor, the sensing principles of which are conventional and will not be further described herein.
[0038] In some embodiments, reference Figures 3 to 6 The smoke detector housing 2 includes a detachably connected third housing portion 21 and a fourth housing portion 22. A groove 210 is provided on the side of the third housing portion 21 facing the fourth housing portion 22. The fourth housing portion 22 and the groove 210 enclose a smoke optical darkroom 20. The groove 210 has a bottom wall 2100 and side walls 2101 surrounding the bottom wall 2100. The bottom wall 2100 and the side walls 2101 are each provided with a plurality of ridges 211 for reflecting light sources. Specifically, the third housing portion 21 and the fourth housing portion 22 can be connected by means of a snap fastener or the like. After the third and fourth housing portions 21 and 22 are connected, a gap exists between the third and fourth housing portions 21 and 22, connecting the smoke optical darkroom 20 and the smoke inlet 13, thereby ensuring that external smoke can enter the smoke optical darkroom 20.
[0039] It should be noted that the ridges 211 can be integrally formed with the fourth shell portion 22. The ridges 211 on the side walls 2101 are sequentially connected and arranged in a surrounding pattern, while the ridges 211 on the bottom wall 2100 are sequentially arranged along a single direction. The ridges 211 reflect and weaken the light emitted by the transmitter into the smoke darkroom 20, thereby preventing the receiver 31 from receiving the light when there is no fire.
[0040] In some embodiments, reference Figures 3 to 6The transmitter 30 has a light emitting end 300 facing the smoke-sensing optical darkroom 20, and the receiver 31 has a light receiving end 310 facing the smoke-sensing optical darkroom 20. The light emitting end 300 and the light receiving end 310 are located in the same plane, and the direction in which the light is emitted by the light emitting end 300 and the direction in which the light is received by the light receiving end 310 are at an angle. The light emitting end 300 of the transmitter 30 and the light receiving end 310 of the receiver 31 are arranged in the same plane and at an angle so that the light emitted by the transmitter 30 can be reflected by the ridge 211 after entering the smoke-sensing optical darkroom 20. In the absence of a fire generating smoke particles, the receiver 31 will not receive the light or will only receive a weak light.
[0041] It is understandable that as a fire occurs, the concentration of smoke particles in the air continues to rise, thereby increasing the diffuse reflection of the light source by the smoke particles in the smoke-sensing optical darkroom 20. The intensity of the light source received by the receiver 31 continues to increase, and the concentration of the smoke particles reaches a threshold. The light signal value received by the receiver 31 also reaches a threshold. At this time, the corresponding light signal alarm threshold is set at the receiver 31, and an accurate and timely alarm can be issued.
[0042] In some embodiments, reference Figure 3 、 Figure 4 and Figure 6 The fourth shell portion 22 includes a first fixing seat 220 and a second fixing seat 221. Both the first fixing seat 220 and the second fixing seat 221 define a fixing hole 222 that connects the accommodating cavity 12 and the smoke sensing optical darkroom 20. The transmitter 30 is disposed through the fixing hole 222 of the first fixing seat 220, and the receiver 31 is disposed through the fixing hole 222 of the second fixing seat 221. The first fixing seat 220 and the second fixing seat 221 can be integrally formed with the main body of the fourth shell portion 22. Similarly, the third shell portion 21 can also be manufactured using an integral molding process, such as thermoplastic molding of plastic or other materials.
[0043] In some embodiments, reference Figures 2 to 4 The fire detector also includes a circuit board 5, which is disposed within the accommodating cavity 12 and located on the side of the fourth housing 22 facing away from the third housing 21. The transmitter 30, receiver 31, and monitoring sensor 4 are each connected to the circuit board 5. The fourth housing 22 also has a positioning post 223 extending toward the circuit board 5. The circuit board 5 is provided with a positioning hole 50, and the positioning post 223 is inserted into the positioning hole 50.
[0044] The circuit board 5 can be a double-layer circuit board 5 , with the transmitter 30, receiver 31, and monitoring sensor 4 located on the side facing the fourth shell 22. The side of the circuit board 5 facing away from the fourth shell 22 can be equipped with components such as signal acquisition circuitry, signal processing circuitry, and power supply circuitry. The circuit board 5 is pre-secured within the second shell 11 , and the transmitter 30 and receiver 31 are placed within the corresponding securing holes 222 . The positioning posts 223 are then inserted into the positioning holes 50 . This helps maintain the relative position of the fourth shell 22 and circuit board 5 , improves the stability of the fourth shell 22, the receiver 31, and the transmitter 30 , reduces the impact of external vibration on the transmitter 30 and receiver 31, and improves protection for the transmitter 30 and receiver 31 .
[0045] In some embodiments, reference Figures 1 to 3 The first shell portion 10 is provided with a plurality of smoke inlets 13 on its outer periphery, and the plurality of smoke inlets 13 are spaced around the first shell portion 10. The first shell portion 10 can be formed in an integrally molded structure, with the plurality of smoke inlets 13 formed circumferentially during the molding process to ensure that external smoke particles enter the accommodation chamber 12 in a timely manner. Correspondingly, the second shell portion 11 can also be formed in an integrally molded structure.
[0046] In some embodiments, reference Figure 1 and Figure 2 The fire detector further includes an insect-proof net 6, which is covered over the smoke inlet 13. The insect-proof net 6 is beneficial for preventing large particles of impurities, insects, etc. in the air from entering the accommodating cavity 12, thereby avoiding contamination of the fire detector and interference with the use of the fire detector.
[0047] In some embodiments, the housing 1 and the insect screen 6 are both made of metal. The housing 1 and the insect screen 6 can be made entirely of, for example, stainless steel. Metal housing 1 and insect screen 6 have excellent resistance to shock and vibration, while also providing excellent shielding properties, thereby enhancing the fire detector's resistance to electromagnetic radiation and static electricity.
[0048] In some embodiments, reference Figure 1 and Figure 3One of the first shell 10 and the second shell 11 has a protrusion 110, and the other has a recess 100 for the protrusion 110 to be inserted into, and the protrusion 110 is threadedly connected to the inner wall of the recess 100. In this embodiment, the protrusion 110 is provided on the second shell 11, and the recess 100 is provided on the first shell 10. By providing external threads on the outer periphery of the protrusion 110 and matching internal threads on the inner wall of the recess 100, the first shell 10 and the second shell 11 can be screwed together by means of the protrusion 110 and the recess 100, facilitating rapid assembly of the housing 1 and providing good connection stability and sealing. In addition, before tightening the first and second shells 10, a certain amount of electronic potting silicone can be poured into the accommodating cavity 12 for auxiliary fixation, which helps to further improve the housing 1's ability to resist salt spray, mold, and humidity and heat.
[0049] In some embodiments, the first light source is blue light and the second light source is infrared light. Specifically, the emitter 30 may periodically emit blue light with a wavelength of 470 nm and infrared light with a wavelength of 940 nm. In other embodiments, other light sources capable of distinguishing smoke particles from interference particles may be emitted, and the wavelength and light source type may be flexibly adjusted as needed.
[0050] In some embodiments, reference Figure 1 and Figure 7 The fire detector also includes a mounting base 111, which is disposed on a side of the second housing 11 facing away from the first housing 10. The mounting base 111 defines a plurality of mounting holes 1110, which are spaced apart around the second housing 11. The mounting base 111 can be integrally formed with the second housing 11. The plurality of mounting holes 1110 provided on the mounting base 111 facilitates the overall installation of the housing 1, improving the stability of the fire detector.
[0051] Furthermore, in some embodiments, reference Figure 1 The fire detector further includes a plug 7. Specifically, the plug 7 can be an aviation plug. The internal wiring of the plug 7 can be provided with grounding, power positive pole, power negative pole, communication positive pole, communication negative pole, etc. This facilitates power supply and communication connection for the internal components of the fire detector, ensuring the timeliness of monitoring power supply, data transmission and alarm.
[0052] Accordingly, a ship fire monitoring system according to an embodiment of the present application includes the fire detector described above. It is understood that the ship fire monitoring system can have all the technical features and technical effects of the fire detector described above, which will not be described in detail here.
[0053] The above is a detailed introduction to a fire detector and a ship fire monitoring system provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present application.
Claims
1. A fire detector, characterized in that: include: A housing (1) comprises a first housing portion (10) and a second housing portion (11) which are detachably connected, wherein the first housing portion (10) and the second housing portion (11) enclose a receiving cavity (12), and at least one of the first housing portion (10) and the second housing portion (11) is provided with a smoke inlet (13); A smoke detection housing (2) is provided in the accommodating cavity (12), and the smoke detection housing (2) has a smoke-sensing optical darkroom (20) connected to the smoke inlet (13); A detection assembly (3) is connected to the smoke detection housing (2), the detection assembly (3) comprising a transmitter (30) and a receiver (31), the transmitter (30) being configured to emit a first light source and a second light source toward the smoke-sensing optical darkroom (20), the wavelength of the first light source being less than 500 nm, and the wavelength of the second light source being greater than 800 nm, and the receiver (31) being configured to receive the light source emitted by the transmitter (30) when the smoke concentration in the smoke-sensing optical darkroom (20) exceeds a threshold value; A monitoring sensor (4) is provided in the accommodating cavity (12), and the monitoring sensor (4) is configured to monitor at least one of temperature and humidity.
2. The fire detector according to claim 1, characterized in that The smoke detection housing (2) comprises a third housing portion (21) and a fourth housing portion (22) that are detachably connected. A groove (210) is provided on a side of the third housing portion (21) facing the fourth housing portion (22). The fourth housing portion (22) and the groove (210) enclose the smoke optical darkroom (20). The groove (210) has a bottom wall (2100) and a side wall (2101) surrounding the bottom wall (2100). The bottom wall (2100) and the side wall (2101) are respectively provided with a plurality of ridges (211) for reflecting a light source.
3. The fire detector according to claim 2, characterized in that The transmitter (30) has a light source emitting end (300) facing the smoke sensing optical darkroom (20), and the receiver (31) has a light source receiving end (310) facing the smoke sensing optical darkroom (20). The light source emitting end (300) and the light source receiving end (310) are located in the same plane, and the direction in which the light source emitting end (300) emits the light source and the direction in which the light source receiving end (310) receives the light source have an included angle.
4. The fire detector according to claim 2 or 3, characterized in that: The fourth shell portion (22) has a first fixing seat (220) and a second fixing seat (221), the first fixing seat (220) and the second fixing seat (221) are both provided with a fixing hole (222), the fixing hole (222) communicating with the accommodating cavity (12) and the smoke optical darkroom (20), the transmitter (30) being arranged through the fixing hole (222) of the first fixing seat (220), and the receiver (31) being arranged through the fixing hole (222) of the second fixing seat (221).
5. The fire detector according to claim 2, characterized in that The fire detector further comprises a circuit board (5), the circuit board (5) being arranged in the accommodating cavity (12), and the circuit board (5) being located on a side of the fourth shell portion (22) facing away from the third shell portion (21), and the transmitter (30), the receiver (31), and the monitoring sensor (4) being respectively connected to the circuit board (5); The fourth shell portion (22) further has a positioning column (223) extending toward the circuit board (5); the circuit board (5) is provided with a positioning hole (50); and the positioning column (223) is plugged into the positioning hole (50).
6. The fire detector according to claim 1, characterized in that A plurality of smoke inlets (13) are provided on the outer peripheral side of the first shell portion (10), and the plurality of smoke inlets (13) are arranged at intervals around the first shell portion (10).
7. The fire detector according to claim 1 or 6, characterized in that: The fire detector further comprises an insect-proof net (6), and the insect-proof net (6) is arranged to cover the smoke inlet (13).
8. The fire detector according to claim 7, characterized in that The housing (1) and the insect-proof net (6) are both made of metal.
9. The fire detector according to claim 1, characterized in that One of the first shell (10) and the second shell (11) has a convex portion (110), and the other is provided with a recess (100) for the convex portion (110) to be inserted, and the convex portion (110) is threadedly connected to the inner wall of the recess (100).
10. The fire detector according to claim 1, characterized in that The first light source is blue light, and the second light source is infrared light.
11. The fire detector according to claim 1, characterized in that The fire detector further comprises a mounting base (111), the mounting base (111) being arranged on a side of the second shell portion (11) facing away from the first shell portion (10), the mounting base (111) being provided with a plurality of mounting holes (1110), and the plurality of mounting holes (1110) being arranged at intervals around the second shell portion (11).
12. A ship fire monitoring system, characterized in that: Comprising the fire detector according to any one of claims 1 to 11.