Patent ID: 7480544
Filing Date: 2009-01-20
Classification: F04D,G05D

Abstract:
1. An operation method of energy-efficient and constant-pressure fluid-transport machines coupled in parallel, comprising: providing a system impedance curve of a load, wherein said system impedance curve is determined by a flow rate and impedance of said load; providing a performance curve and an equal-efficiency curve of a fluid-transport machine, wherein said performance curve of said fluid-transport machine is determined by a flow rate and pressure of said fluid-transport machine; coupling a plurality of said fluid-transport machines in parallel to calculate a performance curve of said fluid-transport machines in parallel, wherein said performance curve of said fluid-transport machines in parallel intercepts said system impedance curve with an operational point, and said operational point is corresponding to said pressure and said flow rate of said load; comparing a plurality of total output powers to acquire a number of fluid-transport machines in parallel according to said pressure of said load, said flow rate of said load and said performance curves of said fluid-transport machines, wherein said total output power corresponding to said number of fluid-transport machines in parallel is minimum in said total output powers; determining a flow rate of fluid-transport machines in parallel by dividing said flow rate of said load with said number of fluid-transport machines in parallel; and adjusting a rotation speed of each of said fluid-transport machines in parallel to make said flow rate of fluid-transport machines in parallel fixed.