Discussion on the application of non-negative pressure water supply equipment

Discussion on the application of non-negative pressure water supply equipment The non-negative pressure water supply equipment is a new type of water supply method developed on the basis of the traditional frequency conversion constant pressure water supply system. It is not a simple combination of pumps, pipe fittings, valves, tanks and control cabinets, but A high-tech product integrating machinery, electronics, information and automatic control technology. With the deepening of the development of the concept of non-negative pressure water supply, more and more scientific research units and production companies have conducted in-depth research on the non-negative pressure technology and have achieved fruitful results. The domestic non-negative pressure technology is analyzed based on the working principle of the existing non-negative pressure water supply equipment in the market. The non-negative pressure water supply system is mainly composed of variable frequency speed regulating water pump units, steady flow compensators, vacuum suppressors, pressure and flow sensors, and Composed of pressure self-balancer, control cabinet, filter, backflow preventer and other equipment. According to the different principles of its realization of non-negative pressure function, it can be roughly divided into the following forms: (1) Steady flow compensator and vacuum suppressor control mode: When the municipal pipe network water supply is insufficient or the user water consumption exceeds the municipal pipe network supply capacity When the vacuum suppressor is opened, the air enters the steady flow compensator, turning the originally closed compensator into a cut-off water tank to suppress negative pressure generation. In addition, a liquid level control is set in the steady flow compensator. When it is lower than the low level, The water pump stopped working. (2) Self-controlled current limiting mode: When the municipal pipe network is insufficient or the user's water consumption is greater than the municipal pipe network's supply capacity, the pressure sensor signal feedback is used to limit the frequency converter so that the pump does not take more water, and the municipal pipe When the network water supply meets the requirements, the system returns to normal. (3) Pressure control point method: When the water supply of the municipal pipe network is insufficient or the user's water consumption is greater than the supply capacity of the municipal pipe network, straight up the variable flow constant pressure water supply water pump. After the water supply meets the requirements, the system returns to normal. Water pump manufactureru003c/pu003e
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