Fire alarm system

Abstract

The utility model belongs to the technical field of fire alarm, and aims to provide a fire alarm system. According to the technical scheme, the fire alarm system comprises a main control module, a smoke detection module, a temperature detection module, an infrared detection module, a display module, an alarm module and a power supply module, the smoke detection module, the temperature detection module, the infrared detection module, the display module and the alarm module are electrically connected with the main control module; the power supply module is used for providing power support for the master control module, the smoke detection module, the temperature detection module, the infrared detection module, the display module and the alarm module. The anti-theft door is simple in structure, economical and practical, can meet the fireproof and anti-theft requirements of small buildings such as residential areas, factories and office areas, and can solve the problem of safety prevention of people in daily life.

Description

Technical Field

[0001] The utility model belongs to the technical field of fire alarm, and in particular relates to a fire alarm system. Background Art

[0002] Among various non-natural disasters, fire is one of the disasters that threaten public safety and social development. The increase in human activities has led to an increase in fire risks. With the development of society and economy, firefighting has become more and more important, and the importance of fire alarms has become increasingly prominent.

[0003] Currently, most fire alarm manufacturers focus on developing fire alarm systems for large public places and precious objects, and they mainly use centralized area alarm control.

[0004] However, in the process of using the prior art, the inventors found that the prior art has at least the following problems: the existing fire alarm has a relatively complex structure and a relatively high production cost. At the same time, some users also have anti-theft needs, but the fire alarm in the prior art cannot achieve the anti-theft function at the same time. Therefore, it is necessary to study a fire alarm system with a simple structure and the ability to achieve anti-theft alarm. Utility Model Content

[0005] In order to solve the above technical problems at least to a certain extent, the utility model provides a fire alarm system.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A fire alarm system comprises a main control module, a smoke detection module, a temperature detection module, an infrared detection module, a display module, an alarm module and a power supply module; the smoke detection module, the temperature detection module, the infrared detection module, the display module and the alarm module are all electrically connected to the main control module; the power supply module is used to provide power support to the main control module, the smoke detection module, the temperature detection module, the infrared detection module, the display module and the alarm module.

[0008] In a possible design, the main control module uses a STC89C52RC single-chip microcomputer and its peripheral circuits.

[0009] In a possible design, the smoke detection module includes a smoke sensor and an analog-to-digital conversion module, and the smoke sensor is communicatively connected to the main control module via the analog-to-digital conversion module.

[0010] In a possible design, the smoke sensor adopts an MQ-2 type smoke sensor; the analog-to-digital conversion module adopts a PCF8591 type analog-to-digital conversion module.

[0011] In a possible design, the temperature detection module uses a DS18B20 temperature sensor.

[0012] In a possible design, the alarm module includes an on-site alarm module and a remote alarm module, and both the on-site alarm module and the remote alarm module are electrically connected to the main control module.

[0013] In a possible design, the on-site alarm module includes a sixth resistor, a transistor and a buzzer; wherein the base of the transistor is electrically connected to the main control module through the sixth resistor, the collector of the transistor is electrically connected to one end of the buzzer, the other end of the buzzer is electrically connected to the power supply module, and the emitter of the transistor is grounded.

[0014] In a possible design, the remote alarm module adopts a GSM communication module.

[0015] In a possible design, the display module uses an LCD1602 liquid crystal display screen.

[0016] The beneficial effects of the utility model are concentrated in that the structure is simple and economical and practical, and it can meet the fire prevention and anti-theft needs of small buildings such as residential areas, factories and office areas, and can solve people's safety and prevention problems in daily life. Specifically, the utility model adopts a main control module, a smoke detection module, a temperature detection module and an infrared detection module as core components. During the implementation process, the smoke detection module can be used to detect the smoke concentration detection signal in the environment, the temperature detection module can be used to detect the temperature detection signal of the environment, and the infrared detection module can be used to detect the infrared detection signal at its set position, and transmit the collected detection signal to the main control module for data processing. When the smoke concentration detection signal and / or the temperature detection signal is greater than the corresponding threshold, the main control module sends a fire alarm message through the alarm module. When the infrared detection signal is abnormal, the main control module can output the anti-theft alarm message through the communication module, thereby realizing the alarm of fire prevention and anti-theft scenes, which has the value of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a control block diagram of a fire alarm system in an embodiment;

[0018] Figure 2 is a circuit schematic diagram of the main control module in the embodiment;

[0019] Figure 3 is a circuit schematic diagram of a smoke detection module in an embodiment;

[0020] Figure 4 is a circuit schematic diagram of the temperature detection module in the embodiment;

[0021] Figure 5is a circuit schematic diagram of a key adjustment module in an embodiment;

[0022] Figure 6 is a circuit schematic diagram of a field alarm module in an embodiment;

[0023] Figure 7 is a circuit schematic diagram of the display module in the embodiment. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0025] Embodiment 1:

[0026] like Figure 1 As shown, this embodiment provides a fire alarm system, including a main control module, a smoke detection module, a temperature detection module, an infrared detection module, a display module, an alarm module and a power module; the smoke detection module, the temperature detection module, the infrared detection module, the display module and the alarm module are all electrically connected to the main control module; the power module is used to provide power support to the main control module, the smoke detection module, the temperature detection module, the infrared detection module, the display module and the alarm module.

[0027] This embodiment has a simple structure and is economical and practical. It can meet the fire prevention and anti-theft needs of small buildings such as residential areas, factories and office areas, and can solve people's safety and prevention problems in daily life. Specifically, this embodiment uses a main control module, a smoke detection module, a temperature detection module and an infrared detection module as core components. During the implementation process, the smoke detection module can be used to detect the smoke concentration detection signal in the environment, the temperature detection module can be used to detect the temperature detection signal of the environment, and the infrared detection module can be used to detect the infrared detection signal at its set position, and transmit the collected detection signal to the main control module for data processing. When the smoke concentration detection signal and / or the temperature detection signal is greater than the corresponding threshold, the main control module sends a fire alarm message through the alarm module. When the infrared detection signal is abnormal, the main control module can output the anti-theft alarm message through the communication module, thereby realizing the alarm of fire prevention and anti-theft scenes, which has the value of promotion and application.

[0028] During the implementation of this embodiment, the infrared detection module can perform infrared detection. When someone breaks into the defense range corresponding to the infrared detection module, the infrared detection module can send a high-level infrared detection signal to the main control module. When no one is there, the infrared detection module can send a low-level infrared detection signal to the main control module. The main control module can confirm whether there is an intrusion based on the infrared detection signal, thereby realizing the anti-theft alarm function.

[0029] In this embodiment, the infrared detection module has a strong adaptability to ambient light, and includes an infrared transmitting module and an infrared receiving module. During the implementation process, the infrared transmitting module emits infrared rays of a certain frequency. When the detection direction encounters an obstacle, the infrared rays are reflected back and received by the infrared receiving module. After the received signal is processed by the comparator circuit, it will output an infrared detection signal to the main control module. During the implementation process, the detection distance can be adjusted by the potentiometer knob, the effective distance range is 2 to 80cm, and the working voltage is 3.3V-5V. The detection distance of the infrared detection module can be adjusted by the potentiometer, has the characteristics of low interference, easy assembly, and easy use, and can be widely used in many occasions such as robot obstacle avoidance, obstacle avoidance car, assembly line counting, and black and white line tracking.

[0030] In this embodiment, Figure 2 As shown, the main control module adopts STC89C52RC type single chip microcomputer U1 and its peripheral circuits.

[0031] It should be noted that the main control module can also use the STM32F1 series of microcontrollers and their peripheral circuits. In comparison, the STC89C52RC microcontroller has the advantages of low cost and low power consumption. Specifically, the STC89C52RC microcontroller is a low-power, high-performance CMOS 8-bit microcontroller with 8K programmable Flash memory. This type of microcontroller has a flexible 8-bit CPU and programmable Flash, which provides a highly efficient and flexible solution for many embedded control application systems. In addition, the STC89C52RC microcontroller has 8k bytes of Flash, 256 bytes of RAM, 32-bit I / 0 port, watchdog timer, 2 data pointers, 3 16-bit timers / counters, 1 6-vector 2-level interrupt structure, full-duplex serial port, and on-chip crystal oscillator and clock circuit. In addition, the STC89C52RC microcontroller has static logic operation down to 0Hz, and has two power saving modes, namely idle mode and power-off protection mode. The peripheral circuits of the STC89C52RC microcontroller include various sub-modules such as crystal oscillator circuit and reset circuit.

[0032] Specifically, in this embodiment, the STC89C52RC type single-chip microcomputer is powered by a 5V power supply; the crystal oscillator circuit adopts a 11.0592MHZ crystal oscillator, and the corresponding load capacitance is selected as 22pf. The execution speed of the STC89C52RC type single-chip microcomputer is determined by the 11.0592MHZ crystal oscillator with a sine wave signal as a reference, and the stability of the XTAL1 pin and the XTAL2 pin of the STC89C52RC type single-chip microcomputer is determined by the stabilizing role played by the load capacitance; the reset circuit can be used to restart the STC89C52RC type single-chip microcomputer when a program error occurs during operation, ensuring that the RST pin is at a high level for more than two machine cycles when power is turned on.

[0033] In this embodiment, the smoke detection module includes a smoke sensor and an analog-to-digital conversion module, and the smoke sensor is communicatively connected to the main control module via the analog-to-digital conversion module.

[0034] It should be noted that, in this embodiment, the signal received by the main control module is a digital signal. The smoke detection signal output by the smoke detection module is relatively weak, so the smoke detection signal needs to be amplified, filtered, level adjusted, etc. to meet the signal input requirements of the main control module.

[0035] During the implementation process, the smoke sensor can detect the combustible gas concentration detection signal in the surrounding environment and convert the smoke detection signal into electrical signals such as voltage / current. The conductivity of the smoke sensor can be significantly increased with the increase of combustible gas concentration, which makes it easier for the main control module to determine whether a fire has occurred, so that users can take timely measures to prevent fire.

[0036] In this embodiment, the smoke sensor adopts an MQ-2 type smoke sensor; the analog-to-digital conversion module adopts a PCF8591 type analog-to-digital converter U2.

[0037] It should be noted that the MQ-2 smoke sensor uses the principle of the influence of smoke concentration on the resistance of smoke-sensitive components to send the smoke concentration detection signal to the main control module. Of course, the smoke sensor can also use the MP-2 type smoke sensor. In this embodiment, the MQ-2 type semiconductor smoke sensor has the advantage of low cost. Specifically, the MP-2 type smoke sensor uses tin dioxide with high sensitivity as the gas-sensitive material, which can detect the content of combustible gas faster and more accurately. It has the advantages of a large range of conductivity changes, strong anti-interference ability, long life, high sensitivity, fast recovery response speed, large output signal, and stable operation. The MQ-2 type smoke sensor can detect the concentration of combustible gas, and convert the smoke detection signal into a voltage / current value through the analog-to-digital conversion module, and then send it to the main control module, thereby realizing the smoke detection function.

[0038] Specifically, during the implementation of this embodiment, the smoke sensor is electrically connected to the analog-to-digital conversion module via the smoke sensor interface J1. The smoke sensor can convert analog signals into digital signals via a PCF8591 converter, and then send them to the main control module for processing.

[0039] Among them, the PCF8591 converter is a monolithic integrated, separately powered, low-power, 8-bit CMOS data acquisition device. It has 4 analog inputs, 1 analog output and 1 serial IIC bus interface. The 3 address pins A0, A1 and A2 of the PCF8591 converter can be used for hardware address programming, allowing 8 PCF8591 devices to be connected on the same I2C bus without additional hardware. The address, control and data signals input and output on the PCF8591 converter are transmitted in serial mode through the two-line bidirectional IIC bus.

[0040] In this embodiment, Figure 4 As shown, the temperature detection module adopts DS18B20 temperature sensor U3.

[0041] Specifically, in this embodiment, the temperature detection module adopts a DS18B20 temperature sensor. Of course, the temperature detection module may also adopt a GX18B20 temperature sensor or a MY18B20 temperature sensor, wherein the DS18B20 temperature sensor has a lower cost.

[0042] Among them, the DS18B20 temperature sensor adopts a unique single bus interface mode, without external equipment, only one port is needed to communicate with the single chip microcomputer in the main control module, so that the main control module can monitor the real-time temperature. In addition, the power supply mode of the DS18B20 temperature sensor can be divided into internal parasitic power supply and external power supply. When the power supply voltage is 3.0V-5.5V, an external power supply is usually used, but if it is connected to the ground, an internal parasitic power supply needs to be used, but this method may affect the driving ability of the DQ pin. The DQ pin can realize bidirectional data transmission and clock signal. It is more stable and reliable to use an external power supply to power the temperature sensor, and the circuit design is also relatively simple. Therefore, in this embodiment, the I / O port of the single chip microcomputer in the main control module is connected to the DQ pin of the DS18B20 temperature sensor for communication, and the DC5V of the DS18B20 temperature sensor is directly connected to the external power module.

[0043] In addition, in this embodiment, if Figure 5As shown, a key adjustment module for adjusting the set thresholds of the smoke detection module and the temperature detection module is further provided. Specifically, the key adjustment module includes a setting key S2, a plus adjustment key S3 and a minus adjustment key S4. Based on the plus adjustment key S3 or the minus adjustment key S4, the set thresholds of the smoke detection module and the temperature detection module can be adjusted plus or minus.

[0044] In this embodiment, the alarm module includes an on-site alarm module and a remote alarm module, and both the on-site alarm module and the remote alarm module are electrically connected to the main control module.

[0045] like Figure 6 As shown, the on-site alarm module includes a sixth resistor R6, a transistor Q1 and a buzzer S1; wherein the base of the transistor Q1 is electrically connected to the main control module through the sixth resistor R6, the collector of the transistor Q1 is electrically connected to one end of the buzzer S1, the other end of the buzzer S1 is electrically connected to the power supply module, and the emitter of the transistor Q1 is grounded.

[0046] In this embodiment, on-site alarm can be realized through the buzzer S1 in the alarm module. The base of the transistor Q1 is connected to the P1.3 pin of the single-chip microcomputer in the main control module through the sixth resistor R6. When the system alarm condition is met, the P1.3 pin of the single-chip microcomputer in the main control module outputs a low level, the transistor Q1 is turned on, and the buzzer S1 sounds, thereby realizing the alarm function.

[0047] In this embodiment, the remote alarm module adopts a GSM (Global System for Mobile Communications) communication module. Of course, it can also adopt a communication module such as a WiFi module, as long as the remote alarm function can be realized, which is not limited here.

[0048] like Figure 7 As shown, the display module adopts LCD1602 type liquid crystal display screen U4.

[0049] It should be noted that the LCD1602 type liquid crystal display screen has the advantages of low power consumption, small size, ultra-thin and light weight, and can display data such as the smoke concentration value and temperature value of the current environment in real time. As an example, in this embodiment, the first line of the display module can display the current ambient temperature, the temperature setting value and the deployment status, and the second line can also display the detected smoke concentration of the current environment and the setting value of the smoke concentration.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fire alarm system, characterized in that: It includes a main control module, a smoke detection module, a temperature detection module, an infrared detection module, a display module, an alarm module and a power module; the smoke detection module, the temperature detection module, the infrared detection module, the display module and the alarm module are all electrically connected to the main control module; the power module is used to provide power support to the main control module, the smoke detection module, the temperature detection module, the infrared detection module, the display module and the alarm module; The alarm module includes an on-site alarm module and a remote alarm module, and both the on-site alarm module and the remote alarm module are electrically connected to the main control module; The on-site alarm module comprises a sixth resistor (R6), a transistor (Q1) and a buzzer (S1); wherein the base of the transistor (Q1) is electrically connected to the main control module through the sixth resistor (R6), the collector of the transistor (Q1) is electrically connected to one end of the buzzer (S1), the other end of the buzzer (S1) is electrically connected to the power module, and the emitter of the transistor (Q1) is grounded; The remote alarm module adopts a GSM communication module; The display module adopts LCD1602 type liquid crystal display screen; The main control module adopts STC89C52RC single chip microcomputer and its peripheral circuits; The smoke detection module includes a smoke sensor and an analog-to-digital conversion module, and the smoke sensor is communicatively connected with the main control module via the analog-to-digital conversion module.

2. A fire alarm system according to claim 1, characterized in that: The smoke sensor adopts the MQ-2 type smoke sensor; the analog-to-digital conversion module adopts the PCF8591 type analog-to-digital conversion module.

3. A fire alarm system according to claim 1, characterized in that: The temperature detection module adopts DS18B20 temperature sensor.

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