Matching system for pump head flow of central air-conditioning water system and resistance flow of air-conditioning pipeline system

Abstract

The invention relates to a matching system for a pump head flow of a central air-conditioning water system and a resistance flow of an air-conditioning pipeline system. The matching system comprises at least one water pump, a plurality of water-cooling air-conditioning host machines, two pressure detectors and a controller, wherein the water pumps are in parallel connection; water outlets of the water pumps are connected with corresponding water inlets of the water-cooling air-conditioning host machines through a water inlet header pipe; the two pressure detectors are respectively mounted on the water inlet header pipe and water outlet header pipe of the water-cooling air-conditioning host machines; signal output ends of pressure difference detectors are connected with a pressure detecting signal input end of the controller; and a control signal output end of the controller is connected with control signal input ends of the water pumps and is used for controlling the rotating speeds of the water pumps. The matching system provided by the invention utilizes an inlet and outlet water pressure difference and a frequency converter to control the rotating speeds of the water pumps so as to control the pump head flow; the problem of oversize head at local flowing moment of the water pumps is solved; the rotating speeds of the water pumps are adjusted by the controller according to the requirement; and the problem of ultrahigh energy consumption of the water pumps is effectively solved.

Description

technical field [0001] The invention relates to a central air conditioner, in particular to a water pump speed control system for the central air conditioner, in particular to a matching system for the head flow rate of the water pump of the central air conditioner water system and the resistance flow rate of the air conditioner piping system. [0002] Background technique [0003] At present, central air conditioning is an indispensable air conditioning system in modern buildings. Among them, the cooling water pump or cooling water pump group in the central air conditioning system provides water for the central air conditioning, and the water enters the unit for heat exchange with the unit, and then the heat in the unit is taken away by water. The chilled water pump or chilled water pump group is set up to deliver the cold and hot water generated by the central air-conditioning main unit to the indoor terminal to provide cold and hot water, and to transport the cold and h...

AI Technical Summary

Problems solved by technology

It will cause flow loss, generally only 80% of the flow of 2 pumps in parallel, and generally only 70% of the flow of 3 pumps in parallel

[0010] In order to ensure that the stop of one of the pumps in the system will not cause reverse flow of water, a one-way valve will be installed at the outlet of each pump, and the one-way valve will also lose part of the efficiency of the pump.

[0011] Some people use multiple pumps to install frequency converters, and then use frequency converters to adjust the speed of multiple pumps to adjust the head and flow, but obviously this method is not economical, and the price of investing in frequency converters is much higher than the price difference of water pumps

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