Secondary water supply-pump station flow meter
Secondary water supply renovation project in an old residential area in Zhejiang Province
Implementing the secondary water supply renovation of old residential areas is one of the important projects to benefit the people. It is recommended to use secondary water supply equipment in the energy-saving renovation project of water pumps in old residential areas. The following is a brief overview of secondary water supply equipment. Secondary water supply equipment is a new type of water supply method developed on the basis of traditional variable frequency constant pressure water supply system. It is not a simple combination of water pumps, pipe valves, control cabinets and tanks, but a high-tech product integrating electronics, machinery, information and automatic control technology. With the in-depth development of the concept of non-negative pressure water supply, more and more scientific research institutions and enterprises have conducted in-depth research on non-negative pressure technology and achieved good results. Domestic non-negative pressure technology is analyzed based on the working principle of existing non-negative pressure water supply equipment on the market. The secondary water supply equipment system is mainly composed of control cabinets, variable frequency speed regulation water pump units, flow stabilizers, pressure and flow sensors, pre-pressure self-balancers, filters, backflow preventers and many other equipment. According to the different functional principles of non-negative pressure, it can be roughly divided into the following forms: 1. Steady flow and vacuum suppressor control mode When the municipal pipe network is short of water supply or the user's water consumption exceeds the supply capacity of the municipal pipe network, the vacuum suppressor will open and air will enter the steady flow, causing the originally closed water tank to become a cut-off water tank, which can prevent the generation of negative pressure. Liquid level control is set in the steady flow, and the water pump will stop working when it is below the lower level. 2. Automatic flow limiting mode When th
