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Energy-saving control method for water pump variable speed based on general flow-speed mathematical model

A mathematical model and energy-saving control technology, applied in pump control, non-variable pumps, machines/engines, etc., can solve problems such as publications, documents or materials that have not been published publicly

Active Publication Date: 2021-10-01
北京凯德中天科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] There are no published publications, documents or materials on the method of variable speed energy-saving control of water pumps based on the general flow-speed mathematical model.

Method used

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  • Energy-saving control method for water pump variable speed based on general flow-speed mathematical model
  • Energy-saving control method for water pump variable speed based on general flow-speed mathematical model
  • Energy-saving control method for water pump variable speed based on general flow-speed mathematical model

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Experimental program
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Effect test

Embodiment Construction

[0030] At present, in the application of pump variable speed operation, the main theoretical basis is the pump characteristic curve equation (2), the pipe network characteristic curve equation (3) and the proportional law equation (4), (5), (6).

[0031] h 1 =aQ 1 2 +bQ 1 +c

(2)

[0032] h 1 =H st +S e Q 1 2 (3)

[0033]

[0034]

[0035]

[0036] In the formula:

[0037] h 1 : current head of the water system, m

[0038] a, b, c: constants

[0039] S e : pipe network friction at rated flow

[0040] no 1 : pump speed target value, rpm or Hz

[0041] Q 1 : the current flow rate of the pump, m 3 / s

[0042] Q e : pump rated flow, m 3 / s

[0043] h e : Rated head of the water system, m

[0044] no e : pump rated speed, rpm or Hz

[0045] h st : net lift of water system, m

[0046] N 1 : Operating power, kW

[0047] N e : rated power, kW

[0048] For a specific water pump, a, b, and c are constants obtained after fitting according to the...

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Abstract

The present invention is based on the universal flow-speed mathematical model of water pump variable speed energy-saving control method, which belongs to water pump variable speed energy-saving and related technologies. The key point of dynamic speed control is to study the influence of the change of net head on the relationship between flow and speed, to study the variable speed range of water pumps, and to construct a general flow-speed mathematical model for variable speed pumps according to the physical characteristics of pump variable speed operating conditions, which solves the lack of theory for water pump variable speed control According to the problem, the variable speed dynamic controller and speed regulating device of the water pump system are used to form the variable speed energy saving control system of the water pump, which can obtain deep and fine closed-loop dynamic energy saving control, and can be widely used in the variable speed control of various water pumps newly built or renovated. water supply system.

Description

technical field [0001] The invention belongs to water pump variable speed energy saving and related technologies. Background technique [0002] The power consumption of water pumps accounts for about 20% of the total electricity consumption in the country. The energy saving of water pump systems plays a decisive role in the implementation of national energy saving and emission reduction policies. Therefore, the variable speed energy saving of water pumps has always been a key research object. [0003] Both water pumps and fans belong to square torque load equipment, but there are some differences between the two. The water pump system usually has a net head, and the congenital conditions are more unfavorable, so it is more complicated than the fan system in terms of variable speed energy saving control. Especially due to the existence of the net head of the water pump system, the proportional law that is also applicable to the power frequency operation of the fan and water p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D15/00
CPCF04D15/0066F04D15/0072
Inventor 高毅夫
Owner 北京凯德中天科技发展有限公司