The invention discloses a
temperature control anti-freezing device for a fire hydrant. The
temperature control anti-freezing device comprises a temperature acquisition module, a control module, a heating module, a power supply module and an alarm module. The temperature acquisition module adopts three PT1000
platinum resistor temperature sensors which are respectively arranged at the water inlet end, the middle section and the fire hydrant interface section of a pipeline, monitors the temperature of each area in real time and transmits the temperature to the control module through a shielding
signal line. The control module is based on an STM32F407
microcontroller, dynamically adjusts PWM output through a PID
algorithm, and controls the flexible
silica gel heating belts arranged in the heating module in a partitioned mode to work. The power supply module adopts a mains supply and a
lithium battery to supply power, and when the
voltage of the mains supply is lower than 198V, automatic switching is realized. And the alarm module triggers sound-light alarm when the temperature is abnormal and wirelessly transmits an
alarm signal through LoRa. According to the device, through distributed
temperature monitoring, partitioned precise heating and an intelligent
temperature control algorithm, freezing of fire fighting water is effectively prevented, and pipeline damage caused by local overheating in a traditional scheme is avoided.