Frequency conversion water supply equipment water supply classification

Frequency water supply equipment, water supply classification according to the characteristics of water supply, frequency conversion water supply equipment, water supply constant pressure variable flow and variable pressure variable flow water two categories. The so-called constant pressure variable flow water supply refers to the change of water flow and water pressure is always the same water supply. The so-called variable pressure variable flow refers to the water supply pressure increases with the flow of a water supply. Suppose the flow resistance characteristic equation of the water supply pipeline is: where H is the head of water supply, is the water supply height (m), Q is the water supply flow rate (), A is the coefficient, which varies with the pipeline and the unit system used. The ideal variable pressure variable flow water supply H = f (Q) should be consistent with equation (1). According to this feature of water supply, to ensure constant water pressure at any end of the water supply pipe. In fact, it is difficult to provide equation (1) for the flow resistance of the water supply pipelines in the design and use phases of the building, and therefore it is not possible to supply the variable pressure variable water of the ideal law (expressed by the formula (1)). In addition, the ideal variable frequency water supply equipment variable pressure water supply must be for a specific water supply pipeline, there is no universality. Therefore, under normal circumstances ideal transformer variable water supply practical little practical value. At present, none of the common variable-frequency speed regulating water supply systems (equipment) is designed with the ideal water supply characteristics of a transformer. Practical variable pressure variable water supply equipment is designed, that is, the pressure of water supply increases with the increase of flow rate. For multi-pump parallel constant pressure water supply, the specific program is the system according to constant pressure water supply design, constant pressure value with the number of pumps into the jump step up. The jump value of each pump input can be set as needed. This makes it possible to bring the water level HQ of the ladder close to the ideal HQ characteristics of the transformer, resulting in excellent energy savings. This variable pressure water supply is named as the variable pressure variable water supply. This kind of variable pressure variable water supply control has versatility and practicability, and has been applied in domestic and international frequency conversion water supply system or equipment. For example, ABB drives produced by the PFC application macro can have the function of quasi-transformers variable water supply.

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