Fire alarm system
By combining external and internal interference suppression devices, electromagnetic interference is suppressed, solving the problem of false alarms caused by non-fire factors in fire alarm systems, and achieving stable operation and high reliability of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-03-24
AI Technical Summary
Existing fire alarm systems are susceptible to non-fire factors such as temperature, humidity, airflow, and electromagnetic interference, leading to false alarms and losses of manpower, material resources, and financial resources.
The method combines external and internal interference suppression devices. The external device suppresses electromagnetic interference on the transmission line through filters, isolation relays, active contactors, etc., while the internal device suppresses the intensity of electromagnetic interference signals through isolation transformers, anti-interference devices, filters, etc.
This effectively reduced the frequency of system fault alarms, ensured the normal and stable operation of the fire alarm system, and improved the system's stability and reliability.
Smart Images
Figure CN224035967U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to fire alarm technical field, specifically, relate to a fire alarm system. BACKGROUND
[0002] With the development of intelligent factory and wisdom city, fire alarm system also tends to be intelligent. The fire automatic alarm system can send linkage control signal to each relevant controlled equipment according to the set control logic, and accept the linkage feedback signal of the relevant equipment, has independent network structure and wiring system, can independently run, operate and manage, has good implementation significance for preventing fire and extinguishing fire.
[0003] In reality, the fire alarm system will cause false alarm due to temperature, humidity, airflow, electromagnetic interference and other non-fire factors, causing different degrees of human, material and financial losses.
[0004] Therefore, an anti-interference fire alarm system is urgently needed. UTILITY MODEL CONTENT
[0005] The utility model is made to solve the above technical problem, and the purpose is to provide a fire alarm system, which solves the problem of false alarm caused by temperature, humidity, airflow, electromagnetic interference and other non-fire factors.
[0006] In order to realize the above purpose, the utility model provides a fire alarm system, which comprises: a fire alarm module, an external interference suppression device arranged outside the fire alarm module, and an internal interference suppression device arranged inside the fire alarm module, wherein,
[0007] The external interference suppression device is used for suppressing electromagnetic interference on the transmission line.
[0008] The internal interference suppression device is used for suppressing the signal strength of electromagnetic interference.
[0009] Preferably, the fire alarm module comprises: a fire-fighting equipment electric control device, a module box and a fire alarm system host; wherein,
[0010] The fire-fighting equipment electric control device is electrically connected with the module box, and the module box is electrically connected with the fire alarm system host.
[0011] Preferably, the fire alarm system host comprises: a detector, a fire-fighting broadcast, a fire-fighting telephone extension and an alarm button; wherein,
[0012] The detector is connected with the fire alarm system host through an alarm bus and a power supply bus;
[0013] The fire alarm system host is connected with the fire alarm system host through a fire alarm bus, the alarm bus and the power bus;
[0014] The fire alarm system host is connected with the fire alarm system host through a fire alarm bus, the alarm bus and the power bus.
[0015] Preferably, the detector, the fire alarm, the fire telephone extension and the alarm button are each provided with a bus isolator for isolating the detection loop of the fire compartment of a short-circuit fault.
[0016] Preferably, the external interference suppression device comprises a first filter and an isolation relay; wherein,
[0017] The first filter is connected in series with the module box, and the first filter is used to suppress electromagnetic noise.
[0018] The isolation relay is arranged at the front end of the module box, and wherein,
[0019] The isolation relay is used to isolate the electromagnetic interference signals in the process of collecting signals outside the fire alarm system host.
[0020] Preferably, the external interference suppression device further comprises an active contactor; wherein,
[0021] The active contactor is electrically connected with the fire equipment control device, and the active contactor is used to control the start and stop of the fire equipment control device.
[0022] Preferably, the internal interference suppression device comprises an isolation transformer, an anti-interference device and a second filter; wherein,
[0023] The isolation transformer and the second filter are connected in series with the power bus.
[0024] The isolation transformer is used to isolate different potentials and suppress common-mode interference.
[0025] The anti-interference device is used to protect electronic equipment from electrical interference.
[0026] The second filter is used to filter external electromagnetic noise.
[0027] Preferably, the anti-interference device is a composite protector.
[0028] Preferably, the active contactor is a normally open contact of a DC 24V power supply.
[0029] Preferably, a display device is arranged on the fire alarm system host.
[0030] According to the above description and practice, the fire alarm system has the beneficial effects that, compared with the traditional fire alarm system, it has the following beneficial effects:
[0031] 1. The filter, isolation relay, active contactor normally open contact and other modes outside the fire alarm module are used to suppress and eliminate the electromagnetic interference on most of the power lines, signal lines and other transmission lines, so as to avoid the strong electric signal from entering the internal part of the fire alarm system and ensure the normal operation of the system.
[0032] 2. The internal interference device composed of the isolation transformer, anti-interference device and second filter inside the fire alarm module achieves the purpose of isolating different areas and different loops, reducing system voltage and suppressing electromagnetic interference strength signal. BRIEF DESCRIPTION OF DRAWINGS
[0033] Figure 1 It is a total schematic view of the fire alarm system involved in an embodiment of the utility model.
[0034] Figure 2 It is a structural schematic view of the external interference suppression device involved in an embodiment of the utility model.
[0035] Figure 3 It is a structural schematic view of the internal interference suppression structure involved in an embodiment of the utility model.
[0036] Figure 4 It is an installation schematic view of the anti-interference device involved in an embodiment of the utility model.
[0037] The reference signs in the drawings are:
[0038] 1. Isolation relay; 2. Active contactor; 3. Input module; 4. Output module; 5. Input and output module; 6. Isolation transformer; 7. Filter; 8. Resistor; 9. Inductor; 10. Capacitor; 11. Bus isolator; 12. Fire-fighting broadcast; 13. Fire-fighting telephone extension; 14. Manual fire alarm button with fire-fighting telephone jack; 15. Anti-interference device. DETAILED DESCRIPTION
[0039] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in one or more embodiments in any suitable manner.
[0040] Further, the accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:
[0041] Unless otherwise defined, the terms "mounting", "connected", "connecting" are to be construed as broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, or electrically connected, can be directly connected, or indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.
[0042] In view of the problem that the conventional fire alarm system in the prior art is prone to false alarm caused by non-fire factors such as temperature, humidity, air flow, electromagnetic interference, etc., the present application provides a fire alarm system.
[0043] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0044] In this embodiment, a fire alarm system is disclosed, Figure 1 The entire schematic diagram of the fire alarm system is shown. Figure 2 The schematic diagram of the external interference suppression device involved in the fire alarm system is shown. Figure 3 The schematic diagram of the internal interference suppression structure involved in the fire alarm system is shown. Figure 4 The installation schematic diagram of the anti-interference device involved in the fire alarm system is shown.
[0045] Please refer to Figures 1 to 4The utility model discloses a fire alarm system, including: fire alarm module, set up the outside interference suppression device of fire alarm module, set up the inside interference suppression device of fire alarm module, wherein, outside interference suppression device is used for inhibiting the electromagnetic interference on transmission line, inside interference suppression device is used for inhibiting the signal intensity of electromagnetic interference.
[0046] Further, the fire alarm module comprises: a fire-fighting equipment electric control device, a module box and a fire alarm system host; wherein the fire-fighting equipment electric control device is electrically connected with the module box, and the module box is electrically connected with the fire alarm system host. The fire alarm system host comprises: a detector, a fire-fighting broadcast 12, a fire-fighting telephone extension 13 and an alarm button 14; wherein the detector is connected with the fire alarm system host through an alarm bus and a power supply bus; the fire-fighting broadcast 12 is connected with the fire alarm system host through a fire-fighting broadcast bus, an alarm bus and a power supply bus; and the fire-fighting telephone extension 13 is connected with the fire alarm system host through a fire-fighting telephone bus, an alarm bus and a power supply bus.
[0047] Further, the detector, the fire-fighting broadcast 12, the fire-fighting telephone extension 13 and the alarm button 14 are all provided with a bus isolator 11, and the bus isolator 11 is used for isolating the detection loop of a fire prevention subarea with a short-circuit fault. When a short-circuit fault occurs in one of the detector, the fire-fighting broadcast 12, the fire-fighting telephone extension 13 and the alarm button 14, the bus isolator 11 can quickly isolate the entire detection loop of the corresponding fire prevention subarea, thereby improving the stability and reliability of the system.
[0048] Further, the external interference suppression device comprises: a first filter 7, an isolation relay 1 and an active contactor 2; wherein the first filter 7 is connected in series with the module box, and the first filter 7 is used for suppressing electromagnetic noise; the isolation relay 1 is arranged at the front end of the module box, and the isolation relay 1 is used for isolating electromagnetic interference signals in the transmission process of the external acquisition signal of the fire alarm system host; and the active contactor 2 is electrically connected with the electric control device of the fire-fighting equipment, and the active contactor 2 is used for controlling the start and stop of the electric control device of the fire-fighting equipment. The first filter 7 is used for the working voltage at a specified power frequency, and is a device for suppressing electromagnetic noise. The main function of the device is to obtain a power signal of a specific frequency or a power signal after a specific frequency is eliminated by connecting the first filter 7 in the power line, so that the useful signal can pass through as much as possible without attenuation, and the useless signal can be reflected as much as possible. The isolation relay 1 can physically isolate the electromagnetic interference signals in the transmission process of the external acquisition signal of the fire alarm system, and significantly reduces the electromagnetic noise level inside the system. The anti-interference device 15 acts as a composite protector, effectively resisting interference from external electrical equipment and protecting the stable operation of the system.
[0049] Further, the internal interference suppression device comprises: an isolation transformer 6, an anti-interference device 15 and a second filter 7; wherein the isolation transformer 6 and the second filter 7 are connected in series with the power bus; the isolation transformer 6 is used for isolating different potentials, suppressing common-mode interference and reducing the electromagnetic noise inside the system, and the windings in the isolation transformer 6 are provided with electrostatic shielding, so that higher anti-interference characteristics can be obtained; the output end and the input end of the isolation transformer 6 are completely disconnected and isolated, so that even if a human body touches an electrified object, the human body will not be electrified, and the safety in use is improved; and the isolation transformer 6 adopts a DC 24V power supply, which is a safe voltage and will not cause damage to the human body. The anti-interference device 15 is used for protecting electronic equipment from electrical interference, and protects the stable operation of the internal electronic equipment of the system; and the second filter 7 is used for filtering out external electromagnetic noise, thereby improving the stability of the system operation.
[0050] Further, the anti-interference device 15 is a composite protector. The anti-interference device 15 is a composite protector composed of a crystal triode, a transient voltage suppressor (TVS diode) and a solid-state discharge tube and the like. The composite protector is an important electronic equipment protection device, and its functions include overvoltage protection, surge interference suppression, electromagnetic interference filtering, safety protection and increasing equipment life. By using the anti-interference device, the electronic equipment can be effectively protected from electrical interference damage, and the reliability and stability of the system are improved. In other embodiments, the components of the anti-interference device 15 can also be composed of diodes (ordinary diodes, rectifier diodes, voltage stabilizing diodes, Zener diodes), gas discharge tubes (GDT), metal oxide varistors (MOV), voltage-dependent resistors 8, multi-layer metal oxide structure devices (MLV), composite protection tubes and the like.
[0051] Further, the active contactor 2 is a normally open contact of a DC 24V power supply. Compared with the conventional passive normally open contact, the active contactor 2 effectively avoids the electromagnetic interference formed due to different voltages when the fire alarm system accesses the external control equipment.
[0052] Further, a display device is arranged on the host of the fire alarm system, which provides an intuitive and convenient operation interface for the user. Through the display device, the user can view the running state, alarm information and fault prompt of the system in real time, greatly improving the maintainability and usability of the system.
[0053] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be regarded as limiting the claims to which they relate.
Claims
1. A fire alarm system, characterized in that, include: The fire alarm module, an external interference suppression device disposed outside the fire alarm module, and an internal interference suppression device disposed inside the fire alarm module; wherein, The external interference suppression device is used to suppress electromagnetic interference on the transmission line; The internal interference suppression device is used to suppress the signal strength of electromagnetic interference.
2. The fire alarm system as described in claim 1, characterized in that, The fire alarm module includes: a fire equipment electrical control device, a module box, and a fire alarm system host; wherein... The fire-fighting equipment electrical control device is electrically connected to the module box, and the module box is electrically connected to the main unit of the fire alarm system.
3. The fire alarm system as described in claim 2, characterized in that, The fire alarm system main unit includes: detectors, fire broadcast system, fire telephone extension, and alarm buttons; wherein... The detector is connected to the fire alarm system host via an alarm bus and a power bus. The fire broadcast is connected to the fire alarm system host via the fire broadcast bus, the alarm bus, and the power bus; The fire telephone extension is connected to the fire alarm system host via the fire telephone bus, the alarm bus, and the power bus.
4. The fire alarm system as described in claim 3, characterized in that, The detector, the fire broadcast, the fire telephone extension, and the alarm button are all equipped with bus isolators, which are used to isolate the detection circuit of the fire compartment in case of short circuit fault.
5. The fire alarm system as described in claim 3, characterized in that, The external interference suppression device includes: a first filter and an isolation relay; wherein... The first filter is connected in series with the module box, and the first filter is used to suppress electromagnetic noise; The isolation relay is located at the front end of the module box, wherein... The isolation relay is used to isolate electromagnetic interference signals during the transmission of signals acquired from the outside of the fire alarm system host.
6. The fire alarm system as described in claim 2, characterized in that, The external interference suppression device further includes: an active contactor; wherein... The active contactor is electrically connected to the fire-fighting equipment's electrical control device, and the active contactor is used to control the start and stop of the fire-fighting equipment's electrical control device.
7. The fire alarm system as described in claim 6, characterized in that, The active contactor is a normally open contact of a DC24V power supply.
8. The fire alarm system as described in claim 3, characterized in that, The internal interference suppression device includes: an isolation transformer, an anti-interference device, and a second filter; wherein... The isolation transformer and the second filter are connected in series with the power bus; The isolation transformer is used to isolate different potentials and suppress common-mode interference; The anti-interference device is used to protect electronic equipment from electrical interference; The second filter is used to filter out external electromagnetic noise.
9. The fire alarm system as described in claim 8, characterized in that, The anti-interference device is a composite protector.
10. The fire alarm system as described in claim 2, characterized in that, A display device is installed on the main unit of the fire alarm system.