Water pump frequency conversion speed regulation control method, device and system

Abstract

The invention relates to a water pump frequency conversion speed regulation control method, device and system. The method comprises the steps that the maximum theoretical flow and corresponding water pump lift, and the minimum theoretical flow and corresponding water pump lift of a water pump water supply or closed-type water circulation system are obtained; according to the maximum theoretical flow and corresponding water pump lift, and the minimum theoretical flow and corresponding water pump lift, a pipe feature theoretical curve is drawn; the current fed water pressure value and the current discharged water pressure value of a water pump in the water pump water supply or closed-type water circulation system are detected, and the actually measured lift of the water pump is calculated; the current flow of the water pump in the water pump water supply or closed-type water circulation system is detected, and according to the pipe feature theoretical curve, the theoretical lift corresponding to the current flow is obtained; and according to the actually measured lift and the theoretical lift, the frequency of the water pump is adjusted until the actually measured lift after the frequency is updated and the theoretical lift after the frequency is updated are the same. The method does not need to arrange a sensor on any demand point, easiness and practicability are achieved, and the energy conservation effect is good.

Description

technical field [0001] The invention relates to the technical field of variable frequency speed regulation of water pumps, in particular to a control method, device and system for variable frequency speed regulation of water pumps. Background technique [0002] Water pump water supply or closed water circulation system is used in thousands of households and all walks of life. Accurate supply on demand is the current mainstream demand, which can save energy or resources to the greatest extent, and meet the needs more accurately. Therefore, frequency conversion speed regulation technology has been widely used Applications. [0003] At present, commonly used frequency conversion speed regulation methods include constant head speed regulation control method and most unfavorable point pressure difference speed regulation control method. The constant head speed regulation control method refers to that no matter what the flow rate is, the pump head is kept at the head of the maxim...

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Problems solved by technology

[0004] Although the constant head speed control method has no risk of under-current, it is not energy-saving because most of the working hours are in the state of over-current and over-voltage

Although the most unfavorable point pressure difference speed control method is energy-saving, the most unfavorable point must first be determined. In the water pump feed water or closed water circulation system, the most unfavorable point is not necessarily the most remote demand point or heat exchange coil branch. , the closer points or branch roads may be more unfavorable due to more bends and resistance points, and the demand degree of each demand point may be different, when the demand pressure difference at the farthest demand point is low, and a relative When the demand pressure difference of the closer demand point is higher, it may be more difficult to meet the demand point and become the most unfavorable point; if the area where the most unfavorable point is located is out of service, or the gradual or sudden change of the pipeline system causes the filter of the branch pipeline to be clogged Asking other questions will also lead to the change of the most unfavorable point; if the selected sensor setting point is not the most unfavorable point, the demand point is met, which may lead to undervoltage and undercurrent at other more unfavorable points, so that the entire control method fails

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