A method for controlling oil return in a multi-line system

A multi-line system and control method technology, applied in the direction of refrigerators, compressors, compressors, etc., can solve the problem of inaccurate oil return, achieve sufficient oil volume, improve oil return reliability, and improve reliability

Active Publication Date: 2020-08-18
QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an oil return control method for a multi-line system, which solves the problem of inaccurate oil return

Method used

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  • A method for controlling oil return in a multi-line system
  • A method for controlling oil return in a multi-line system
  • A method for controlling oil return in a multi-line system

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0045] In the oil return control method of the multi-connected system of this embodiment, the multi-connected system includes an indoor unit and a plurality of outdoor units, the plurality of outdoor units are respectively connected to the indoor unit, and the indoor unit includes a plurality of parallel-connected indoor units.

[0046] For example, a multi-split system includes two outdoor units: the first outdoor unit and the second outdoor unit; see figure 1 As shown; the first outdoor unit includes a compressor 101, an oil separator 102, a one-way valve 103, a four-way valve 104, an outdoor heat exchanger 105, a gas-liquid separator 106, etc., and an oil level sensor 107 is arranged in the compressor 101 , used to detect the oil level of the re...

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Abstract

The invention discloses a method for controlling oil return of a multi-connection system. The multi-connection system includes an indoor unit and a plurality of outdoor units, and the plurality of outdoor units are respectively connected to the indoor unit; the method includes: judging the multi-connection Whether there is compressor oil shortage in the system; if so, enter the oil return control: obtain the oil level of each compressor; adjust the oil return frequency of each compressor according to the system load rate and the oil level of each compressor; It affects the normal operation of the system, and realizes directional and precise oil return to ensure sufficient oil in each compressor, improves the reliability of oil return, and improves the reliability of system operation.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to an oil return control method for a multi-line system. Background technique [0002] At present, the use of multi-connected central air conditioners is becoming more and more common. With the diversification of architectural design, the length of piping and the difference between internal and external units are increasing. In order to ensure reliable lubrication of compressors, various oil return modes are generally designed for units. When multiple outdoor units are connected, the oil content of the compressors of each outdoor unit is different due to the different operating hours. At present, the regular oil return method is commonly used. All outdoor units return oil at the same time, with equal output and equal oil return. It will cause some compressors to lack oil, and some compressors to have too much oil, resulting in inaccurate oil return. Contents o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B13/00F25B31/00F25B41/04F25B41/06F25B49/02F25B41/20F25B41/24F25B41/34
CPCF25B13/00F25B31/004F25B49/022F25B2700/03F25B2600/02F25B2500/16F25B41/20F25B41/31
Inventor 王海胜卢大海张铭崔国栋张莉
Owner QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD
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