Introduction:Non negative pressure water supply systemIt is a new type of water supply method developed on the basis of the traditional variable frequency constant pressure water supply system. It is not a simple combination of water pumps, pipe fittings, valves, tanks, and control cabinets, but a high-tech product that integrates mechanical, electronic, information, and self-control technologies.
　　
According to the existing market, there is no negative pressure technology in ChinaNon negative pressure water supply equipmentAnalyzing the working principle, the non negative pressure water supply system mainly consists of a variable frequency speed regulating water pump unit, a steady flow compensator, a vacuum suppressor, pressure and flow sensors, a pre pressure self balancing device, a control cabinet, a filter, a backflow preventer, and other equipment.
　　
According to the different principles of achieving non negative pressure function, it can be roughly divided into the following forms:
　　
1. Control mode of steady current compensator and vacuum suppressor
　　
When the municipal water supply network is insufficient or the user's water consumption exceeds the supply capacity of the municipal water supply network, the vacuum suppressor opens and air enters the steady flow compensator, turning the originally closed compensator into a cut-off water tank to suppress negative pressure. In addition, liquid level control is set in the steady flow compensator. When it is lower than the low level, the water pump stops working.
　　
2. Self controlled current limiting mode
　　
When the municipal water supply network is insufficient or the user's water consumption exceeds the supply capacity of the municipal water supply network, the feedback of pressure sensing signals is used to limit the frequency converter, so that the water pump does not take excessive water. When the municipal water supply network meets the requirements, the system returns to normal.
　　
3. Pressure control point method
　　
When the municipal water supply network is insufficient or the user's water consumption exceeds the supply capacity of the municipal water supply network, a variable flow constant pressure water supply pump is directly started. After the water supply meets the requirements, the system returns to normal.