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Oil return control method and device and multi-split air conditioner system

A multi-line system and oil return control technology, which is applied in the field of multi-line systems, can solve the problems of not providing differentiated oil return solutions, and achieve the effect of reasonable and reliable design and precise oil return

Active Publication Date: 2021-02-12
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the embodiment of the present invention, an oil return control method, device and multi-line system are provided to solve the problem in the prior art that no differentiated oil return scheme is provided according to the actual engineering situation during oil return

Method used

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  • Oil return control method and device and multi-split air conditioner system
  • Oil return control method and device and multi-split air conditioner system
  • Oil return control method and device and multi-split air conditioner system

Examples

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Comparison scheme
Effect test

Embodiment 1

[0068] see figure 1 , figure 1 It is a flow chart of an oil return control method provided by an embodiment of the present invention. The method is applied to a multi-line system and includes the following steps:

[0069] S10: Determine the average length of the connecting pipe between the internal and external units, the first correction coefficient and the second correction coefficient according to the system operating parameters;

[0070] The operating parameters of the system can be parameters such as the inlet pipe temperature of the indoor unit, the outlet pipe temperature of the indoor unit, the ambient temperature, the number of internal units in the system, and the capacity ratio of the indoor and outdoor units. a correction factor and a second correction factor;

[0071] S20: Determine the corresponding oil return priority based on the average length of the connecting pipe, the first correction coefficient and the second correction coefficient;

[0072] The averag...

Embodiment 2

[0076] see figure 2 , figure 2 It is a flow chart of another oil return control method provided by the embodiment of the present invention. This method is applied to a multi-line system and includes the following steps:

[0077] S101: Determine the average length of the connecting pipe between the internal and external machines according to the system parameters;

[0078] The system parameters may be the inlet pipe temperature of the indoor unit, the outlet pipe temperature of the indoor unit, etc. Please refer to Embodiment 3 for details. The length of each connecting pipe is determined based on different system parameters, and then the average value is calculated to obtain the average length L of the connecting pipe.

[0079] S102: Determine a first correction coefficient according to the number of internal machines in the system;

[0080] During specific implementation, the first correction parameters corresponding to the number of internal units may be preset, see Tab...

Embodiment 3

[0097] On the basis of the above-mentioned embodiment 2, preferably, a specific method for obtaining the average length of the connecting pipe is further provided, see the attached image 3 , with image 3 A flow chart for determining the average length of connecting pipes between internal and external units is shown.

[0098] In the refrigeration debugging mode, all the indoor units are fully turned on, the lowest temperature can be set, and the ultra-high-end operation is performed. Step S101 specifically includes:

[0099] S1011: Calculate the difference ΔTPi between the inlet pipe temperature TJi of each indoor unit and the system average low pressure saturation temperature Tpd;

[0100] Wherein, the temperature TJi of the inlet pipe of the indoor unit can be obtained by detecting the temperature sensing package of the inlet pipe of the indoor unit on the hydraulic pipe of each indoor unit, and the unit is °C. Tpd is the average low pressure saturation temperature value ...

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Abstract

The invention discloses an oil return control method and device and a multi-split air conditioner system. The method comprises the steps that the average length, the first correction coefficient and the second correction coefficient of a connecting pipe between an inner unit and an outer unit are determined according to system operation parameters; the corresponding oil return priority is determined based on the average length, the first correction coefficient and the second correction coefficient of the connecting pipe; and oil return operation of the multi-split air conditioner system is controlled based on the oil return priority. According to the oil return control method and device and the multi-split air conditioner system, different oil return priorities can be determined accordingto the actual engineering condition, the oil return priority design is reasonable and reliable, accurate oil return is achieved, oil return is conducted when a unit needs oil, and the phenomenon thatoil is frequently returned when the unit is sufficient in oil amount or oil is not returned in time when the unit is short of oil is avoided.

Description

technical field [0001] The present invention relates to the technical field of air conditioner oil return control, in particular to an oil return control method, device and multi-connection system. Background technique [0002] Due to the large number of indoor units and the long length of the connecting pipes of the multi-split unit, after a period of operation, a large amount of refrigeration oil will remain in the indoor units and the connecting pipes. The system design usually has oil return control for the heat exchanger of the indoor unit and the connecting pipe. The refrigerant oil in the pipe is brought back to the outdoor unit. [0003] The traditional multi-line oil return control method is single, and oil return operation occurs frequently during cooling or heating operation, which seriously affects user comfort and causes more noise complaints; frequent oil return also leads to increased operating energy consumption. The oil return control of the traditional mul...

Claims

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Application Information

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IPC IPC(8): F24F11/61F24F11/64F24F11/86F25B31/00F24F140/20
CPCF24F11/61F24F11/64F24F11/86F25B31/004F24F2140/20
Inventor 焦华超申传涛金孟孟武连发
Owner GREE ELECTRIC APPLIANCES INC
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