Anti-fog smoke-sensing fire detector
By setting up a temperature control module in the dark room of the smoke-sensitive fire detector to heat the air flow, the problem of the detector being susceptible to water mist false alarms is solved, and the accuracy of fire detection and effective utilization of resources are achieved.
Patent Information
- Application Number
- CN202421202130.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-29
AI Technical Summary
Conventional smoke fire detectors are susceptible to water mist and produce false alarms, resulting in false alarms and waste of fire resources.
The temperature control module is installed in the dark room of the detector, and the airflow is heated through the temperature control module to aerosolize the water mist, thereby avoiding the water mist scattering the laser.
Effectively eliminate water mist, avoid misreports caused by the scattering effect of water mist on the laser, ensure the accuracy of fire detection, and avoid false alarms and waste of resources.
Smart Images
Figure CN222482809U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fire detection, in particular to an anti-fog smoke fire detector. Background Art
[0002] In the process of indoor fire monitoring, smoke fire detectors are often used for fire detection. They can be roughly divided into gas-sensitive resistor type, photoelectric sensor type and ion sensor type. The detection principle of the photoelectric sensor type is to set a set of laser transmitters and receivers in a dark box. When there is no fire, the laser receiver cannot receive the laser emitted by the laser transmitter. When a fire occurs, the smoke generated during the combustion process diffuses into the dark box. Due to the scattering effect of particles on the laser, the laser receiver will receive the scattered laser. By identifying the light intensity received by the laser receiver, the concentration of smoke in the air can be indirectly identified, and then it can be determined whether a fire has occurred.
[0003] However, it is not only smoke and dust in the air that can scatter lasers. Water mist can also scatter lasers. For example, when boiling water under a smoke fire detector, the rising water mist enters the detector and scatters the laser, causing the smoke fire detector to falsely alarm, resulting in false alarms and wasting firefighting resources.
[0004] It should be noted that the information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to a person skilled in the art. Utility Model Content
[0005] In order to solve the technical problem that the above-mentioned conventional smoke fire detectors are easily affected by water mist and produce false alarms, the utility model provides an anti-fog smoke fire detector, which includes a substrate and a shell, the shell includes a base and an upper cover, the base is arranged on the substrate, the upper cover is surrounded by air holes, the upper cover and the base cover each other to form a darkroom, a temperature control module and a light sensing module are provided in the darkroom, a heating zone is provided in the darkroom, the temperature control module is arranged in the heating zone, and the temperature control module can control the temperature of the airflow entering the darkroom.
[0006] Furthermore, the heating zone is annular and is located below the pores.
[0007] Furthermore, the temperature control module includes a heating body and a temperature sensor, the heating body is arranged around the heating zone, the temperature sensor is electrically connected to the substrate and is located in the heating zone, and the temperature sensor can monitor the temperature of the heating zone.
[0008] Furthermore, the heating body is a spiral heating wire.
[0009] Furthermore, the light sensing module includes a transmitter and a receiver, the transmitter and the receiver are respectively arranged on two sides of the bottom of the base, and the transmitter and the receiver are respectively electrically connected to the substrate.
[0010] Further, the axes of the transmitter and the receiver intersect.
[0011] Furthermore, the anti-fog smoke fire detector also includes a humidity sensor, which is arranged in the darkroom and is electrically connected to the substrate.
[0012] Further, the humidity sensor is located directly below the intersection of the axes of the transmitter and the receiver.
[0013] Furthermore, the anti-fog smoke fire detector also includes an adapter plate, which is arranged at the bottom of the base, and the humidity sensor is arranged on the adapter plate, the humidity sensor is electrically connected to the adapter plate, and the adapter plate is electrically connected to the substrate.
[0014] Furthermore, a matte portion is provided on the inner top wall of the upper cover.
[0015] Based on the above, the anti-fog smoke fire detector provided by the utility model, compared with the prior art, arranges a temperature control module in a dark room, and heats the airflow through the temperature control module to vaporize the water mist in the airflow, thereby preventing the water mist from entering the dark room with the airflow and scattering the laser, thereby achieving the technical effect of eliminating the water mist, avoiding false alarms caused by the scattering effect of water mist on the laser, and wasting fire-fighting resources. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. The positional relationship described in the drawings in the following description is based on the direction of the components in the drawings unless otherwise specified.
[0017] Figure 1 A schematic diagram of the structure of an anti-fog smoke fire detector provided by an embodiment of the utility model;
[0018] Figure 2 A schematic diagram of the explosion structure of an anti-fog smoke fire detector provided by an embodiment of the utility model;
[0019] Figure 3A schematic diagram of the structure of a darkroom provided in one embodiment of the utility model;
[0020] Figure 4 for Figure 1 Cross-sectional view at AA in the middle.
[0021] Reference numerals:
[0022] DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying 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 utility model. In addition, the terms "first" and "second" are used only for descriptive purposes, 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 of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof all mean "at least including".
[0025] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of an anti-fog smoke fire detector provided by an embodiment of the utility model; Figure 2 A schematic diagram of the explosion structure of an anti-fog smoke fire detector provided in one embodiment of the utility model.
[0026] In order to solve the technical problem that the conventional smoke fire detector is easily affected by water mist and generates false alarms, or to achieve at least one of the above advantages or other advantages, an embodiment of the utility model provides an anti-fog smoke fire detector. As shown in the figure, the anti-fog smoke fire detector includes: a substrate 10 and a housing 20. The substrate 10 is pre-buried with a power supply and a communication line.
[0027] The housing 20 includes a base 21 and an upper cover 22. In a specific implementation, the base 21 is disposed on the substrate 10, and the upper cover 22 is surrounded by air holes 30. The upper cover 22 and the base 21 cover each other to form a dark chamber 40. Air can flow into the dark chamber 40 through the air holes 30.
[0028] A temperature control module 50 and a light sensing module 60 are provided in the darkroom 40. A heating zone is provided in the darkroom. The heating zone is an annular space located between the mutually staggered positions of the base 21 and the upper cover 22, and the temperature control module 50 is arranged in the heating zone. When air flows into the darkroom 40 from the air hole 30, it first flows through the temperature control module 50, and the temperature control module 50 can control the temperature of the airflow entering the darkroom 40.
[0029] Preferably, the heating zone is located below the air hole 30. It should be noted that in the actual application scenario of the detector, it should be fixed upside down on the ceiling. At this time, the heating zone is located above the air hole 30, which satisfies the natural law that smoke spreads upward, and naturally flows through the temperature control module 50 and then flows into the darkroom 40.
[0030] Specifically, if Figure 3 As shown, the temperature control module 50 includes a heating body 51 and a temperature sensor 52. The heating body 51 is arranged around the heating zone. The heating body 51 is electrically connected to the substrate 10. The temperature sensor 52 is electrically connected to the substrate 10 and is located in the heating zone. The temperature sensor 52 can monitor the temperature of the heating zone to prevent the temperature of the heating zone from being too high to damage the particles in the air.
[0031] Preferably, the heating body 51 is a spiral heating wire, which can ensure a large contact area with the airflow in a limited space without blocking or hindering the airflow.
[0032] In some preferred embodiments, the light sensing module 60 includes a transmitter 61 and a receiver 62. In specific implementation, the transmitter 61 and the receiver 62 are respectively arranged on both sides of the bottom of the base 21. The transmitter 61 and the receiver 62 are respectively electrically connected to the substrate. Preferably, the axes of the transmitter 61 and the receiver 62 intersect.
[0033] It is understandable that if Figure 4As shown, the axes of the transmitter 61 and the receiver 62 intersect, but are not facing each other directly, that is, under normal circumstances, the receiver 62 cannot directly receive the laser emitted by the transmitter 61. Only when there is smoke in the airflow in the darkroom 40, the receiver 62 can receive the laser emitted by the transmitter 61 through the scattering of smoke particles. At this time, the receiver collects light intensity data, obtains the smoke concentration and issues an alarm.
[0034] In some preferred embodiments, the anti-fog smoke fire detector further includes a humidity sensor 70 , which is disposed in the darkroom 40 .
[0035] In a specific implementation, an adapter plate 80 is provided at the bottom of the base 21, and the adapter plate 80 is electrically connected to the base plate 10. The humidity sensor 70 is provided on the adapter plate 80. The humidity sensor 70 can monitor the humidity of the airflow in the darkroom 40. When the humidity of the airflow in the darkroom 40 is lower than the threshold value H (defined according to 80% relative humidity of air under the temperature condition of the darkroom 40), it means that only smoke exists in the airflow in the darkroom 40 without the interference of water mist. The receiver 62 collects the received light intensity data, obtains the smoke concentration and issues an alarm, thereby realizing the fire detection function.
[0036] If the humidity in the darkroom 40 is higher than the threshold value H, it means that there is water mist in the airflow in the darkroom 40. The heater 51 works to increase the temperature to vaporize the water mist, thereby preventing the detector from giving a false alarm due to the scattering effect of the water mist on the laser.
[0037] Preferably, the humidity sensor 70 is located directly below the intersection of the axes of the transmitter 61 and the receiver 62. On the one hand, it is closest to the laser scattering area and has the highest monitoring accuracy. On the other hand, it saves the most space without affecting the optical path.
[0038] In some preferred embodiments, a matte portion 90 is provided on the inner top wall of the upper cover 22. Specifically, the matte portion 90 is a sawtooth-shaped protrusion, which can prevent the receiver 62 from directly receiving the laser emitted by the transmitter 61 through the reflection effect of the top wall of the upper cover 22, thereby affecting the monitoring result.
[0039] After a comparative test: a conventional smoke fire detector and the anti-fog smoke fire detector described in this application were fixed at 30-40cm above the water vapor generator and timed. The conventional smoke fire detector began to generate false alarms in about 30 seconds, while the anti-fog smoke fire detector did not generate an alarm. When the experimental time was extended to 2 hours, the anti-fog smoke fire detector still did not generate an alarm.
[0040] It should be noted that the above comparative test is only used to illustrate the beneficial effects of the anti-fog smoke fire detector of the present application, and should not be understood as an improvement on the method of use. Conventional methods of use are used in the process.
[0041] To sum up, compared with the prior art, the anti-fog smoke fire detector provided by the utility model, by arranging a temperature control module in a dark room, heats the airflow through the temperature control module, so that the water mist in the airflow is vaporized, and the water mist is prevented from entering the dark room with the airflow and scattering the laser, thereby achieving the technical effect of eliminating the water mist, avoiding false alarms caused by the scattering effect of the water mist on the laser, and causing wrong alarms and wasting fire-fighting resources.
[0042] Although the terms such as darkroom, transmitter, receiver, etc. are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.
[0043] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the utility model can be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background technology at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation on the claim.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. An anti-fog smoke fire detector, characterized in that: include substrate; The shell comprises a base and an upper cover, wherein the base is arranged on the substrate, the upper cover is surrounded by air holes, the upper cover and the base cover each other to form a darkroom, a temperature control module and a light sensing module are arranged in the darkroom, a heating zone is arranged in the darkroom, and the temperature control module is arranged in the heating zone, and the temperature control module can control the temperature of the airflow entering the darkroom.
2. The anti-fog smoke fire detector according to claim 1, characterized in that: The heating zone is annular and is located below the air hole.
3. The anti-fog smoke fire detector according to claim 1, characterized in that: The temperature control module includes a heating body and a temperature sensor. The heating body is arranged in the heating zone in a surrounding manner. The temperature sensor is electrically connected to the substrate and is located in the heating zone. The temperature sensor can monitor the temperature of the heating zone.
4. The anti-fog smoke fire detector according to claim 3, characterized in that: The heating body is a spiral heating wire.
5. The anti-fog smoke fire detector according to claim 1, characterized in that: The light sensing module comprises a transmitter and a receiver. The transmitter and the receiver are respectively arranged on two sides of the bottom of the base. The transmitter and the receiver are respectively electrically connected to the substrate.
6. The anti-fog smoke fire detector according to claim 5, characterized in that: The axes of the transmitter and the receiver intersect.
7. The anti-fog smoke fire detector according to claim 6, characterized in that: The anti-fog smoke fire detector further comprises a humidity sensor, which is arranged in the darkroom and electrically connected to the substrate.
8. The anti-fog smoke fire detector according to claim 7, characterized in that: The humidity sensor is located directly below the intersection of the axes of the transmitter and the receiver.
9. The anti-fog smoke fire detector according to claim 7, characterized in that: The anti-fog smoke fire detector also includes an adapter plate, which is arranged at the bottom of the base, and the humidity sensor is arranged on the adapter plate. The humidity sensor is electrically connected to the adapter plate, and the adapter plate is electrically connected to the substrate.
10. The anti-fog smoke fire detector according to claim 1, characterized in that: The inner top wall of the upper cover is provided with a matte portion.