Operation method of energy-saving fluid transporting machineries in parallel array with constant pressure

• US 7,480,544 B2
• Filed: 07/10/2006
• Issued: 01/20/2009
• Est. Priority Date: 12/02/2005
• Status: Expired due to Fees

• Current Assignee: Wen-Cheng Huang
• Original Assignee: Wen-Cheng Huang
• Inventors: Huang, Wen-Cheng, Fu, Wu-Hsiung, Wang, Chi-Yi
• Primary Examiner(s): Rodriguez; Paul L
• Assistant Examiner(s): Laughlin; Nathan
• Application Number:
  US11/482,805
• Publication Number:
  US 20070150113A1
• Time in Patent Office: 925 Days
• Field of Search: 700/282, 417/1, 417/2, 417/3, 417/5, 73/11.6
• US Class Current: 700/282
• CPC Class Codes: F04D 15/029 for pumps operating in parallel
• CPC Class Codes: G05D 7/0641 using a plurality of throttling means G05D7/067 takes precedence

Abstract

The present invention discloses a system of energy-efficient and constant-pressure fluid-transport machines coupled in parallel, which can flexibly and massively provide gas and water to every fabrication unit. The system of the present invention comprises: variable-frequency centrifugal fluid-transport machines, pressure gauges, power meters, flow meters, and controllers. The performance curves of the abovementioned system of fluid-transport machines coupled in parallel and the system impedance curves of the loads are analyzed theoretically and built in the controllers together with the equal-efficiency curves provided by the manufacturer. When the system is operating, the data detected by the pressure gauges, power meters, and flow meters are compared with the built-in data to obtain the optimal energy-efficient conditions as the operational criteria of the system of the present invention.

Claims

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.

2. The operation method of claim 1, further comprising turning on or shutting down said fluid-transport machines in parallel.

3. 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 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

turning on or shutting down said fluid-transport machines in parallel according to said number of fluid-transport machines in parallel.

4. The operation method of claim 3, further comprising 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.