Fire safety monitoring system
Through the debris stacking detection system composed of Doppler effect sensors and related circuits, the safety hazards caused by stacking items in the fire safety monitoring system are solved, timely detection and processing of escape channels are realized, and the reliability of fire safety monitoring is improved. sex.
Patent Information
- Application Number
- CN202420210953.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-01-29
AI Technical Summary
The existing fire safety monitoring system has monitoring loopholes and safety hazards, especially when items are stacked, it is difficult to detect and deal with it in a timely manner.
The debris stacking detection circuit consisting of Doppler effect sensor, comparison circuit, delay circuit and switch control circuit is used to detect items entering the set area through microwave signals, and determine the long-term stacking situation through timing cycle detection, send alarms and wireless communications Module reminds staff to handle it.
It effectively eliminates safety hazards caused by stacking items, improves the reliability of fire safety monitoring, and ensures smooth escape passages.
Smart Images
Figure CN222145411U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of fire management, and specifically to a fire safety monitoring system. Background Art
[0002] Fire is a common disaster that can cause huge losses to people's lives, property and the environment. Modern fire safety monitoring systems can monitor and identify fires in real time through sensors, image recognition, artificial intelligence and other technologies, realize automatic alarm and emergency response, and greatly improve the efficiency and accuracy of fire prevention. However, the existing fire safety monitoring system still has some monitoring loopholes and potential safety hazards. Utility Model Content
[0003] The utility model provides a fire safety monitoring system, which solves the problem of monitoring loopholes in the fire safety monitoring system in the related art.
[0004] The technical solution of the utility model is as follows: it comprises a debris stacking detection circuit connected to a first controller, the debris stacking detection circuit comprises a Doppler effect sensor, a comparison circuit, a first delay circuit and a switch control circuit,
[0005] The Doppler effect sensor is used to detect the entry of an object into a set area. The first input end of the comparison circuit is connected to the output end of the Doppler effect sensor. The second input end of the comparison circuit is connected to a reference voltage. The output end of the comparison circuit is connected to the input end of the first delay circuit. The output end of the first delay circuit is connected to the first controller.
[0006] The first end of the switch control circuit is connected to the first power supply, the second end of the switch control circuit is connected to the power supply end of the Doppler effect sensor, and the first controller is used to periodically send a control signal to the control end of the switch control circuit.
[0007] Furthermore, the comparison circuit includes a comparator U3, a non-inverting input terminal of the comparator U3 is a first input terminal of the comparison circuit, an inverting input terminal of the comparator U3 is a second input terminal of the comparison circuit, and an output terminal of the comparator U3 is an output terminal of the comparison circuit.
[0008] Furthermore, the first delay circuit includes a capacitor C1 , a first end of the capacitor C1 is connected to the output end of the comparator U3 , and a second end of the capacitor C1 is grounded.
[0009] Furthermore, the switch control circuit includes a switch tube Q1, a first end of the switch tube Q1 is a first end of the switch control circuit, a second end of the switch tube Q1 is a second end of the switch control circuit, and a control end of the switch tube Q1 is connected to the first controller.
[0010] Furthermore, a voltage follower is connected between the output end of the Doppler effect sensor and the input end of the comparison circuit.
[0011] Furthermore, it also includes a fire door status detection circuit, which includes a resistor R5, a reed switch U5 and a capacitor C2. The first end of the resistor R5 is connected to the second power supply, the second end of the resistor R5 is connected to the first end of the reed switch U5, the second end of the reed switch U5 is grounded, the capacitor C2 is connected in parallel to both ends of the reed switch U5, and the first end of the reed switch U5 is connected to the second controller.
[0012] Furthermore, an alarm circuit is included, which includes a NOT gate U6A and a NOT gate U6B connected in sequence, wherein the power supply end of the NOT gate U6A is connected to the first end of the reed switch U5, the input end of the NOT gate U6A is connected to the output end of the NOT gate U6B through a capacitor C3, and the input end of the NOT gate U6A is connected to the input end of the NOT gate U6B through a resistor R6.
[0013] The output end of the NOT gate U6B is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is connected to the second power supply end of the alarm U8, the first power supply end of the alarm U8 is connected to the second power supply, and the second end of the switch tube Q2 is grounded.
[0014] Furthermore, it also includes a first wireless communication module, and the first controller is connected to the monitoring platform through the first wireless communication module.
[0015] Furthermore, it also includes a second wireless communication module, and the second controller is connected to the monitoring platform through the second wireless communication module.
[0016] The working principle and beneficial effects of the utility model are:
[0017] In the utility model, the Doppler effect sensor includes an oscillator, a transmitter and a detector, etc. The transmitter transmits the microwave signal generated by the oscillator to the external antenna to form microwave protection in the set area. By setting the Doppler effect sensor in the set area such as the corridor, when an object or a person enters the set area, the microwave signal is reflected, and the detector calculates the frequency shift between the reflected microwave signal and the emitted microwave signal and outputs it. The output signal of the Doppler effect sensor is connected to the first input end of the comparison circuit and compared with the reference voltage of the second input end. When an object or a person enters the set area, the comparison circuit outputs a high-level signal. In order to avoid the influence of interference signals, a first delay circuit is added to the output end of the comparison circuit. If the output end of the comparison circuit is still high after a period of delay, it indicates that an object or a person has entered the set area.
[0018] In order to further determine whether there are objects that have been piled up for a long time in the set area, the first controller can periodically send a control signal to control the switch control circuit to enable, that is, to periodically control the Doppler effect sensor to be powered on and work. The timing period can be set to one day. For example, the Doppler effect sensor is powered on and work at the same time every day. If objects can be detected in the set area when powered on for more than ten times in a row, it is determined that the object is an object that has been piled up for a long time, and the staff needs to be reminded to deal with it in time to avoid the stacking of objects in the set area causing blockage of the escape route, thereby eliminating safety hazards and improving the reliability of fire safety monitoring. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0020] Figure 1 This is the schematic diagram of the debris stacking detection circuit in the utility model;
[0021] Figure 2 This is the principle diagram of the fire door status detection circuit in the utility model. DETAILED DESCRIPTION
[0022] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.
[0023] The fire safety monitoring system of this embodiment includes a debris stacking detection circuit connected to the first controller, and the debris stacking detection circuit includes a Doppler effect sensor U1, a comparison circuit, a first delay circuit and a switch control circuit.
[0024] The Doppler effect sensor U1 is used to detect the entry of an object into a set area. The first input end of the comparison circuit is connected to the output end of the Doppler effect sensor U1, the second input end of the comparison circuit is connected to the reference voltage, the output end of the comparison circuit is connected to the input end of the first delay circuit, and the output end of the first delay circuit is connected to the first controller.
[0025] A first end of the switch control circuit is connected to the first power supply, a second end of the switch control circuit is connected to the power supply end of the Doppler effect sensor U1, and the first controller is used to periodically send a control signal to the control end of the switch control circuit.
[0026] In the utility model, the Doppler effect sensor U1 includes an oscillator, a transmitter and a detector, etc. The transmitter transmits the microwave signal generated by the oscillator to the external antenna to form microwave protection in the set area. By setting the Doppler effect sensor U1 in the set area such as the corridor, when an object or a person enters the set area, the microwave signal is reflected, and the detector calculates the frequency shift between the reflected microwave signal and the emitted microwave signal and outputs it. The output signal of the Doppler effect sensor U1 is connected to the first input end of the comparison circuit and compared with the reference voltage of the second input end. When an object or a person enters the set area, the comparison circuit outputs a high-level signal. In order to avoid the influence of interference signals, a first delay circuit is added to the output end of the comparison circuit. If the output end of the comparison circuit is still high after a period of delay, it indicates that an object or a person has entered the set area.
[0027] In order to further determine whether there are objects that have been piled up for a long time in the set area, the first controller can periodically send a control signal to control the switch control circuit to enable, that is, to periodically control the Doppler effect sensor U1 to be powered on and work. The timing period can be set to one day. For example, the Doppler effect sensor U1 is powered on and work at the same time every day. If the Doppler effect sensor U1 can be detected to have objects in the set area when it is powered on for more than ten times in a row, it is judged that the object is an object that has been piled up for a long time, and the staff needs to be reminded to deal with it in time to avoid the stacking of objects in the set area causing blockage of the escape route, thereby eliminating safety hazards and improving the reliability of fire safety monitoring.
[0028] Furthermore, the comparison circuit includes a comparator U3, a non-inverting input terminal of the comparator U3 is a first input terminal of the comparison circuit, an inverting input terminal of the comparator U3 is a second input terminal of the comparison circuit, and an output terminal of the comparator U3 is an output terminal of the comparison circuit.
[0029] In this embodiment, the comparator U3 is used to implement the comparison circuit function. When an object or a person enters the set area, the output voltage of the Doppler effect sensor U1 is greater than the reference voltage, and the comparator U3 outputs a high level. The reference voltage is obtained by voltage division of the resistor R2 and the resistor R3. The reference voltage can be adjusted by adjusting the resistance values of the resistor R2 and the resistor R3. The circuit structure is simple and easy to operate.
[0030] Furthermore, the first delay circuit includes a capacitor C1 , a first end of the capacitor C1 is connected to the output end of the comparator U3 , and a second end of the capacitor C1 is grounded.
[0031] In this embodiment, the first delay circuit is implemented by capacitor C1, which can filter out short-time interference pulse signals and avoid false triggering of the debris accumulation detection circuit caused by short-time interference pulse signals.
[0032] Further, the switch control circuit includes a switch tube Q1, a first end of the switch tube Q1 is a first end of the switch control circuit, a second end of the switch tube Q1 is a second end of the switch control circuit, and a control end of the switch tube Q1 is connected to the first controller.
[0033] In this embodiment, the first controller periodically sends a high level signal to the control end of the switch tube Q1 to control the switch tube Q1 to be turned on periodically, thereby controlling the Doppler effect sensor U1 to be powered on periodically, which is beneficial to reducing the power consumption of the Doppler effect sensor U1.
[0034] Furthermore, a voltage follower is connected between the output terminal of the Doppler effect sensor U1 and the input terminal of the comparison circuit.
[0035] In this embodiment, the output end of the Doppler effect sensor U1 is connected to the voltage follower U2A, which plays a role of impedance matching, and is conducive to better transmitting the output signal of the Doppler effect sensor U1 to the comparison circuit.
[0036] Furthermore, it also includes a fire door status detection circuit, which includes a resistor R5, a reed switch U5 and a capacitor C2. The first end of the resistor R5 is connected to the second power supply, the second end of the resistor R5 is connected to the first end of the reed switch U5, the second end of the reed switch U5 is grounded, the capacitor C2 is connected in parallel to both ends of the reed switch U5, and the first end of the reed switch U5 is connected to the second controller.
[0037] In this embodiment, the reed switch U5 is arranged on the fire door, and a magnet is arranged at the corresponding position of the door frame. The fire door is in a normally closed state, and the node in the reed switch is closed under the suction of the magnet, and the first end of the reed switch is at a low level; when the fire door is opened, the reed switch is away from the magnet, and the node in the reed switch jumps open under the action of the reset spring. Due to the delay effect of the capacitor C2, the voltage at the first end of the reed switch U5 gradually increases. When the opening time of the fire door exceeds the set value, the first end of the reed switch U5 is recognized as a high level by the second controller, and the second controller judges that the fire door has been opened for a long time based on this.
[0038] It should be noted that the first controller and the second controller may adopt currently commonly used microcontrollers such as single chip microcomputer, DSP, ARM, etc., and no specific limitation is made here.
[0039] Furthermore, an alarm circuit is included, which includes a NOT gate U6A and a NOT gate U6B connected in sequence, wherein the power supply end of the NOT gate U6A is connected to the first end of the reed switch U5, the input end of the NOT gate U6A is connected to the output end of the NOT gate U6B through the capacitor C3, and the input end of the NOT gate U6A is connected to the input end of the NOT gate U6B through the resistor R6.
[0040] The output end of the NOT gate U6B is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is connected to the second power supply end of the alarm U8, the first power supply end of the alarm U8 is connected to the second power supply, and the second end of the switch tube Q2 is grounded.
[0041] In this embodiment, the NOT gate U6A and the NOT gate U6B form a multivibrator circuit. When the fire door is opened for a long time, the first end of the reed switch U5 is at a high level, the power supply end of the NOT gate U6A is energized, the multivibrator circuit starts to work, and the output end of the NOT gate U6B outputs a square wave signal. The square wave signal controls the switch tube Q2 to be turned on and off periodically, thereby controlling the alarm to intermittently send out an alarm signal.
[0042] The working principle of the multivibrator circuit is as follows: when the input end of the NOT gate U6A is at a low level, the output end of the NOT gate U6A is at a high level, and the output end of the NOT gate U6B is at a low level. The output end of the NOT gate U6A charges the capacitor C3 through the resistor R6. As the capacitor C3 is charged, the input end voltage of the NOT gate U6A increases continuously. When it increases to a set value, the NOT gate U6B jumps to a high level. The NOT gate U6B reversely charges the capacitor C3. The input end voltage of the NOT gate U6A decreases continuously. When it decreases to a set value, the NOT gate U6B jumps to a low level. This cycle continues, and a multivibrator signal is output at the output end of the NOT gate U6B.
[0043] Furthermore, it also includes a first wireless communication module, and the first controller is connected to the monitoring platform through the first wireless communication module.
[0044] In this embodiment, the first controller sends the debris stacking information of the set area to the monitoring platform through the first wireless communication module, so that the back-end management personnel can find the safety hazard of the evacuation passage being blocked in time.
[0045] Furthermore, it also includes a second wireless communication module, and the second controller is connected to the monitoring platform via the second wireless communication module.
[0046] In this embodiment, the second controller sends the fire door status information to the monitoring platform through the second wireless communication module, so that the back-end management personnel can promptly discover the safety hazard caused by the fire door being opened for a long time.
[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. Fire safety monitoring system, characterized in that, It includes a debris stacking detection circuit connected to the first controller, the debris stacking detection circuit includes a Doppler effect sensor, a comparison circuit, a first delay circuit and a switch control circuit, The Doppler effect sensor is used to detect the entry of an object into a set area. The first input end of the comparison circuit is connected to the output end of the Doppler effect sensor. The second input end of the comparison circuit is connected to a reference voltage. The output end of the comparison circuit is connected to the input end of the first delay circuit. The output end of the first delay circuit is connected to the first controller. The first end of the switch control circuit is connected to the first power supply, the second end of the switch control circuit is connected to the power supply end of the Doppler effect sensor, and the first controller is used to periodically send a control signal to the control end of the switch control circuit.
2. The fire safety monitoring system according to claim 1, characterized in that: The comparison circuit includes a comparator U3, a non-inverting input terminal of the comparator U3 is a first input terminal of the comparison circuit, an inverting input terminal of the comparator U3 is a second input terminal of the comparison circuit, and an output terminal of the comparator U3 is an output terminal of the comparison circuit.
3. The fire safety monitoring system according to claim 2, characterized in that: The first delay circuit includes a capacitor C1 , a first end of the capacitor C1 is connected to the output end of the comparator U3 , and a second end of the capacitor C1 is grounded.
4. The fire safety monitoring system according to claim 1, characterized in that: The switch control circuit includes a switch tube Q1, a first end of the switch tube Q1 is a first end of the switch control circuit, a second end of the switch tube Q1 is a second end of the switch control circuit, and a control end of the switch tube Q1 is connected to the first controller.
5. The fire safety monitoring system according to claim 1, characterized in that: A voltage follower is connected between the output end of the Doppler effect sensor and the input end of the comparison circuit.
6. The fire safety monitoring system according to claim 1, characterized in that: It also includes a fire door status detection circuit, which includes a resistor R5, a reed switch U5 and a capacitor C2. The first end of the resistor R5 is connected to the second power supply, the second end of the resistor R5 is connected to the first end of the reed switch U5, the second end of the reed switch U5 is grounded, the capacitor C2 is connected in parallel to the two ends of the reed switch U5, and the first end of the reed switch U5 is connected to the second controller.
7. The fire safety monitoring system according to claim 6, characterized in that: It also includes an alarm circuit, which includes a NOT gate U6A and a NOT gate U6B connected in sequence, the power supply end of the NOT gate U6A is connected to the first end of the reed switch U5, the input end of the NOT gate U6A is connected to the output end of the NOT gate U6B through a capacitor C3, and the input end of the NOT gate U6A is connected to the input end of the NOT gate U6B through a resistor R6. The output end of the NOT gate U6B is connected to the control end of the switch tube Q2, the first end of the switch tube Q2 is connected to the second power supply end of the alarm U8, the first power supply end of the alarm U8 is connected to the second power supply, and the second end of the switch tube Q2 is grounded.
8. The fire safety monitoring system according to claim 1, characterized in that: It also includes a first wireless communication module, and the first controller is connected to the monitoring platform through the first wireless communication module.
9. The fire safety monitoring system according to claim 6, characterized in that: It also includes a second wireless communication module, and the second controller is connected to the monitoring platform via the second wireless communication module.