Application of pressure sensor in non-negative pressure water supply system

At present, in order to eliminate the impact on residential water use in urban water supply, the relevant urban water supply regulations drafted by my country stipulate that it is not allowed to install domestic and production water pumps directly on the municipal pipeline network. Resident water supply equipment is connected in series to the municipal water supply pipe network, and a non-negative pressure water supply system is required. A flow controller and a sub-cavity stabilized pressure compensation tank should be added between the pump inlet and the municipal pipe network. The flow controller constantly monitors the municipal pipes. Net pressure. While ensuring that the municipal pipe network does not produce negative pressure, it can also make full use of the original pressure of the municipal pipe network.   　　The non-negative pressure water supply system detects the pressure change of the water supply pipe network when the water consumption changes through the high-sensitivity pressure sensor or pressure switch installed on the water supply pipe network, and continuously transmits the changed signal to the microcomputer. According to different operating conditions, the compensation amount is dynamically controlled to achieve dynamic pressure balance and ensure a constant pressure in the water supply pipe network to meet the water needs of users. When municipal piped tap water enters the regulating tank at a certain pressure, the air in the pressure stabilizing compensation tank is discharged from the vacuum eliminator, and the vacuum eliminator is automatically closed after the water is full. When the tap water can meet the water pressure and water volume requirements, the water supply equipment directly supplies water to the water pipe network through the bypass check valve; when the pressure of the tap water pipe network cannot meet the water requirements, the system will pass the pressure sensor, or the pressure switch, the electricity The contact pressure gauge gives the pump signal to start the pump operation.     　　In addition, when the water is supplied by the pump, if the water volume of the tap water pipe network is greater than the pump flow rate, the system maintains normal water supply. During the peak period of water use, if the water volume of the tap water pipe network is less than the pump flow rate, the water in the regulating tank can still be used as a supplementary water source to supply water normally. At this time, the air enters the regulating tank from the vacuum eliminator, which eliminates the negative pressure of the tap water pipe network. After the peak period of water use, the system returns to its normal state. If the tap water supply is insufficient or the water supply of the pipe network is stopped, which causes the water level in the regulating tank to drop continuously, the liquid level controller will give a water pump shutdown signal to protect the water pump unit. This process circulates in this way, and finally achieves the purpose of water supply without negative pressure.