Water chiller, water output adjustment method and air conditioning system

Patent metadata

Field	Value
Publication number	US-12264860-B2
Application number	US-202017628663-A
Country	US
Kind code	B2
Filing date	Jul 6, 2020
Priority date	Aug 30, 2019
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

A water chiller, a water output adjustment method, and an air conditioning system. The water chiller includes: at least two cooling towers used in parallel, a water pressure balance adjustment circuit, and a main control hoard, where each of the at least two cooling towers includes a water pressure pre-adjustment circuit, the main control board is configured to control the water pressure pre-adjustment circuit to realize real-time water output adjustment of the each of the at least two cooling towers, and control the water pressure balance adjustment circuit to achieve a water output balance adjustment among-multiple cooling towers.

First claim

What is claimed is:

1. A water chiller, comprising: at least two cooling towers used in parallel, a water pressure balance adjustment circuit, and a main control board, wherein each of the at least two cooling towers comprises a water pressure pre-adjustment circuit, the main control board is configured to control the water pressure pre-adjustment circuit to realize real-time water output adjustment of the each of the at least two cooling towers, and control the water pressure balance adjustment circuit to achieve a water output balance adjustment among multiple cooling towers,
wherein the water pressure pre-adjustment circuit comprises: a water pressure detection module, a water pressure control module and a first comparison module, wherein the water pressure control module receives a water pressure control signal from the main control board and outputs a control signal, and the first comparison module is configured to compare the control signal output by the water pressure control module with a water pressure detection signal output by the water pressure detection module to obtain a first comparison result, and output a water output adjustment signal to a pump of the each of the at least two cooling towers according to the first comparison result.

2. The water chiller according to claim 1 , wherein the first comparison module comprises a subtractor and an adder, input signals of the subtractor are the control signal output by the water pressure control module and the water pressure detection signal output by the water pressure detection module respectively, an output signal of the subtractor and the control signal output by the water pressure control module are used as input signals of the adder, and the water output adjustment signal is output from an output terminal of the adder.

3. The water chiller according to claim 2 , wherein the subtractor comprises: an operational amplifier U 9 , a negative input terminal of the operational amplifier U 9 is connected to an output terminal of the water pressure detection module through a resistor R 38 , a positive input terminal of the operational amplifier U 9 is connected to an output terminal of the water pressure control module through a resistor R 33 , the positive input terminal of the operational amplifier U 9 is further grounded through a resistor R 34 , an output terminal of the operational amplifier U 9 is connected to the adder, and the output terminal of the operational amplifier U 9 is further connected to the negative input terminal of the operational amplifier U 9 through a resistor R 39 .

4. The water chiller according to claim 2 , wherein the adder comprises: an operational amplifier U 3 , a positive input terminal of the operational amplifier U 3 is connected to an output terminal of the subtractor through a resistor R 3 , the positive input terminal of the operational amplifier U 3 is further connected to an output terminal of the water pressure control module through a resistor R 4 , a negative input terminal of the operational amplifier U 3 is grounded through a resistor R 1 , and the water output adjustment signal is output from an output terminal of the operational amplifier U 3 .

5. The water chiller according to claim 1 , wherein the water pressure balance adjustment circuit comprises:
a plurality of balance modules, each of the plurality of balance modules corresponding to a cooling tower of the at least two cooling towers, and configured to receive a water pressure detection signal sent by the water pressure detection module corresponding to the each of the plurality of balance modules and the water pressure control signal sent by the main control board; and
a second comparison module configured to receive and compare output signals sent by the plurality of balance modules to obtain a second comparison result, and feed back the second comparison result to the main control board;
wherein the main control board adjusts water output control signals according to the second comparison result to realize a balance of water outputs among the at least two cooling towers.

6. The water chiller according to claim 5 , wherein one of the plurality of balance modules comprises: an operational amplifier U 1 , an operational amplifier U 2 , and an operational amplifier U 4 , wherein:
a positive input terminal of the operational amplifier U 2 is connected to an output terminal of the water pressure detection module, a negative input terminal of the operational amplifier U 2 is connected to a negative input terminal of the operational amplifier U 1 through a resistor R 9 , an output terminal of the operational amplifier U 2 is connected to a positive input terminal of the operational amplifier U 4 through a resistor R 22 , and the output terminal of the operational amplifier U 2 is further connected to the negative input terminal of the operational amplifier U 2 through a resistor R 5 ;
a positive input terminal of the operational amplifier U 1 is connected to an output terminal of the main control board, an output terminal of the operational amplifier U 1 is connected to the negative input terminal of the operational amplifier U 4 through a resistor R 21 , and the output terminal of the operational amplifier U 1 is connected to the negative input terminal of the operational amplifier U 1 through a resistor R 8 ;
a positive input terminal of the operational amplifier U 4 is grounded through a resistor R 26 , an output terminal of the operational amplifier U 4 is connected to an input terminal of the second comparison module through a resistor R 27 , and the output terminal of the operational amplifier U 4 is further connected to the negative input terminal of the operational amplifier U 4 through a resistor R 23 .

7. The water chiller according to claim 5 , wherein the second comparison module comprises: an operational amplifier U 8 , a negative input terminal of the operational amplifier U 8 is connected to an output terminal of one of the plurality of balance modules through a resistor R 16 , a positive input terminal of the operational amplifier U 8 is connected to an output terminal of another one of the plurality of balance modules through a resistor R 17 , the positive input terminal of the operational amplifier U 8 is further grounded through a resistor R 19 , and an output terminal of the operational amplifier U 8 feeds back the comparison result to the main control board, and the output terminal of the operational amplifier U 8 is further connected to the negative input terminal of the operational amplifier U 8 through a resistor R 18 .

8. The water chiller according to claim 6 , wherein the operational amplifier U 4 is a differential amplifier.

9. A water output adjustment method of a water chiller, wherein the water chiller comprises at least two cooling towers used in parallel, a water pressure balance adjustment circuit, and a main control board, each of the at least two cooling towers comprises a water pressure pre-adjustment circuit, and the water output adjustment method comprises:
controlling, by the main control board, the water pressure pre-adjustment circuit to realize real-time water output adjustment of the each of the at least two cooling towers, and
control, by the main control board, the water pre sure balance adjustment circuit to achieve a water output balance adjustment among multiple cooling towers,
wherein the water pressure pre-adjustment circuit comprises a water pressure detection module, a water pressure control module and a first comparison module, and the controlling, by the main control board, the water pressure pre-adjustment circuit to realize real-time water output adjustment of the each of least two cc towers comprises:
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Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

• Hu Jiang
• Shen Lifeng
• Qian Pei
• Zhou Baolin

Classifications

• F25B2700/19

  Pressures · CPC title

• F24F2140/12

  Heat-exchange fluid pressure · CPC title

• F24F11/89

  Arrangement or mounting of control or safety devices · CPC title

• F24F11/88 Primary

  Electrical aspects, e.g. circuits · CPC title

• F24F11/49

  ensuring correct operation, e.g. by trial operation or configuration checks · CPC title