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Control method of refrigerant flow of multi-connected unit

A control method and technology for refrigerant flow, applied in heating and ventilation control systems, heating methods, household heating, etc., can solve problems such as uneven distribution of refrigerant and uncontrollable total system flow, and achieve the effect of automatically adjusting the total flow

Active Publication Date: 2012-02-15
TCL AIR CONDITIONER ZHONGSHAN CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of refrigerant control caused by the structure of multi-connected central air conditioners, including the problem of uneven distribution of refrigerant and the uncontrollable total flow of the system, a method for controlling the flow of multi-connected refrigerant is proposed to solve this problem

Method used

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  • Control method of refrigerant flow of multi-connected unit
  • Control method of refrigerant flow of multi-connected unit

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Embodiment Construction

[0026] This method is based on the relationship between the return air temperature TH of the compressor of the multi-connected central air conditioner, the outlet temperature T3 of the heat exchanger of the outdoor unit, the temperature T2 of the evaporator, and the outlet temperature T2B of the evaporator, and controls the internal unit and the external unit according to certain rules. The method of controlling the refrigerant flow is implemented by the electronic expansion valve of the machine.

[0027] The multi-connection system includes one outdoor machine 10, multiple internal machines 9, branch pipes and connecting pipes of the internal and external machines. The external machines are connected to multiple internal machines through the connecting pipes of the internal and external machines and the branch pipes.

[0028] The external unit 10 includes a compressor 1, a four-way valve 2, an external unit heat exchanger 3, an external unit electronic expansion valve 4, a com...

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Abstract

The invention discloses a control method of refrigerant flow of a multi-connected unit. The multi-connected unit comprises an outdoor unit, indoor units, a compressor and a four-way valve, wherein the outdoor unit is connected with the multiple parallelly-connected indoor units, and the outdoor unit is provided with an outdoor unit electronic expansion valve; and each indoor unit is provided withan indoor unit electronic expansion valve, and an air return part of the compressor, the middles and outlets of indoor unit heat exchangers, and an outlet of an outdoor unit heat exchanger are provided with temperature sensors. The opening control rule of the indoor unit electronic expansion valves is that after the initial opening is determined, the opening is adjusted by a difference value A obtained by subtracting the average temperature value of the current bootable indoor unit heat exchangers from the temperature value of the indoor unit heat exchangers, and the opening control rule of the outdoor unit electronic expansion valve is that after the initial opening is determined, the opening is adjusted by a difference value B obtained by subtracting the average temperature value of thecurrent bootable indoor unit heat exchangers or the outlet temperature value of the outdoor unit heat exchanger from the air return temperature of the compressor. The control method can effectively and automatically control the refrigerant flow among the indoor units of multi-connected central air conditioners.

Description

technical field [0001] The invention relates to the technical field of refrigeration, and more specifically relates to a method for controlling the flow rate of multi-line refrigerants. Background technique [0002] The multi-connected central air conditioner is a type of central air conditioner in which an outdoor unit is connected to multiple indoor units, commonly known as "one-to-many", and the centralized management of each indoor unit adopts network control. One indoor unit can be started independently, or multiple indoor units can be started at the same time. It has the advantages of free control, high efficiency and energy saving, and easy installation and maintenance. It is welcomed by users. [0003] However, due to the large change in the load of the multi-connected system, one outdoor unit is connected to multiple indoor units, and the refrigerant piping between the indoor and outdoor units is long, and the length of the refrigerant piping between the indoor unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00F24F11/02
Inventor 陈卫东郑明华陈少锋黄培猛
Owner TCL AIR CONDITIONER ZHONGSHAN CO LTD
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