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High-efficiency cluster type water pump system with constant pressure and variable flow and operation control method

A water pump system and variable flow technology, applied in pump control, water supply pipeline system, pumping station, etc., can solve problems such as unreasonable water pump configuration, insufficient water supply, waste of electric energy, etc., achieve significant energy saving effects, shorten start-up time, and save hardware The effect of investment

Inactive Publication Date: 2012-03-21
BOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the water consumption of some industrial and mining enterprises varies greatly, and the traditional manual operation method is difficult to meet the water supply demand, and the phenomenon of insufficient water supply or running water often occurs, which not only causes waste of water resources, but also often causes waste of electric energy
For complex water supply and drainage systems, relevant literature has disclosed a group-controlled water pump system composed of multiple pumps and multiple frequency converters. The switching mode of the pump group realizes positional control according to the water demand. At the same time, the system efficiency has been improved to a certain extent, but there are still the following problems: (1) The configuration of the water pump is not reasonable, and there is still a lot of room for energy saving and efficiency improvement; (2) The entire system is equipped with many frequency converters, and the frequency conversion The price of the device is high, the one-time investment is large, and the cost performance of the whole system is low; (3) The pump set adopts the hard switching method, which is easy to cause water hammer effect and bring great damage to the pipeline system

Method used

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  • High-efficiency cluster type water pump system with constant pressure and variable flow and operation control method
  • High-efficiency cluster type water pump system with constant pressure and variable flow and operation control method
  • High-efficiency cluster type water pump system with constant pressure and variable flow and operation control method

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Embodiment Construction

[0025] Such as figure 1 As shown, the clustered water pump system involved in the present invention includes a plurality of sequentially numbered water pumps 1, each of which is connected to a control valve 2, and the number of water pumps is determined according to the following method:

[0026] 1) First determine the operating conditions required by the user, including head, maximum flow and minimum flow; take head H=250m, maximum flow Qmax=550m 3 / hour, minimum flow Qmin=150 m 3 / hour as an example.

[0027] 2) Take the minimum flow rate and head demand of the working condition as the rated flow rate Q of a single pump 1 N and rated head H N , and then by the efficiency η of the actual water pump N To select the rated rated shaft power parameter P N =ρgQ N h N / (3600ηN ), ρ is liquid density, unit is Kg / m 3 , g is the gravitational acceleration, the unit is m / s squared; with Q N =150m 3 / hour, H N =250m, the rated efficiency of the pump is η N =0.74 as an exam...

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Abstract

The invention discloses a high-efficiency cluster type water pump system with constant pressure and variable flow and an operation control method. According to the high-efficiency cluster type water pump system, a water pump can be reasonably configured according to the constant pressure and water consumption continuous change rule of industrial and mining enterprises. The high-efficiency cluster type water pump system comprises a plurality of water pumps, a full-voltage bus, two frequency converting buses, two frequency converters and a plurality of normally-opened alternating current contactors, wherein one water pump is a speed regulating pump and other water pumps are constant speed pumps; each water pump is provided with a driving motor; the driving motors are divided into a group I and a group II; each driving motor in two groups is connected with the full-voltage bus, a frequency converting bus I and a frequency converting bus II through contacts of the two alternating current contactors; a frequency converter I and a frequency converter II are respectively connected between the full-voltage bus and the frequency converting bus II as between the frequency converting bus I and the frequency converting bus II through contacts of another two alternating current contactors; and one residual contact of the alternating current contactor is connected between the two frequency converting buses. The control process comprises a start process of the water pumps, the speed regulating operation process of a variable speed pump, a flexible switching process of the water pumps and the speed regulating operation process of the variable speed pump after the flexible switching process is ended.

Description

technical field [0001] The invention relates to a high-efficiency cluster water pump system with constant pressure and variable flow in a water supply system and an operation control method. More specifically, according to the needs of industrial and mining enterprises for constant pressure and variable flow, rationally configure fixed-speed pumps, variable-speed pumps and frequency converters and build clusters Type water pumps to ensure that each water pump is in a high-efficiency operating state under different operating conditions. Background technique [0002] At present, the water consumption of some industrial and mining enterprises varies greatly, and the traditional manual operation method is difficult to meet the water supply demand, and the phenomenon of insufficient water supply or running water often occurs, which not only causes waste of water resources, but also often causes The waste of electric energy. For complex water supply and drainage systems, relevant...

Claims

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Application Information

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IPC IPC(8): E03B5/00E03B7/07F04B49/06
Inventor 巫庆辉于忠党
Owner BOHAI UNIV
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