High-efficient frequency-variable and speed-adjusting water supplying method with total flow and supplying apparatus thereof

Abstract

This is a water supply method at entire flow rate and high efficient speed adjustment by frequency conversion. Divide the area into different districts in vertical first and figure out lift difference among the districts. Then decide the numbers and total flow rate of pumps in large capacity and small capacity. Set the pump's speed adjustment scopes and start-stop configures and restrict the low limits of pump's high frequency and pressure of pipe networks. The air pressing water supply tank, small capacity pump and large capacity pump are started in order, water flow rate changes from high to low, frequency conversion pumps are closed in order as the manner of large capacity pumps starting, running at decreasing frequency, small capacity pumps starting near to large ones low limitation, both large and small ones stop at reaching their low limitation. This method keeps the pumps working at high efficiency period during all water supply time and avoids repeating start and stop.

Description

(1) Technical field [0001] The invention relates to a frequency conversion speed regulation supply method and equipment for a fluid circulation system, in particular to a frequency conversion speed regulation supply method and equipment applicable to building water supply. (2) Background technology [0002] The existing frequency conversion water supply equipment has two grades of products: the first is an early product, which is characterized by 2~3 water pumps, one of which is controlled by a frequency converter, and the other is a power frequency pump (not controlled by a frequency converter) . When the flow rate is small, the inverter is put into operation, the current frequency drops, the water pump runs at a low speed, and there is no lower limit of frequency. When the frequency is low to a certain value, the water pump runs idly and cannot supply water to the system. When the water consumption of the system gradually increases, the current frequency gradually increas...

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Problems solved by technology

Compared with the initial products, this type of product has improved to a certain extent when the pump works in the high-efficiency section, and is more energy-efficient than the initial products. Therefore, the objective function is unclear, the improvement measures are not targeted, there is no definition for the high-efficiency section of the water pump, and there is no definition for the frequency of the high-efficiency working motor current, so it is impossible to fundamentally solve the energy-saving problem of frequency conversion speed regulation water supply equipment

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