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Oil mass regulating and controlling method for multi-connected air conditioning unit

A multi-connected air conditioner and unit technology, which is applied to compressors, refrigerators, refrigeration components, etc., can solve problems such as burning out compressors, lack of oil in compressors, and reducing the heat transfer effect of indoor and outdoor heat exchangers, achieving Avoid oil shortage, equal oil quantity, and ensure the effect of cooling and heating

Active Publication Date: 2014-05-14
NINGBO AUX ELECTRIC
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In this way, the heat exchange effect of the indoor and outdoor heat exchangers will be reduced, thereby reducing the cooling and heating effects of the air conditioner. Moreover, due to the loss of cold oil, the compressor will be short of oil, and in severe cases, the compressor will be burned.

Method used

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  • Oil mass regulating and controlling method for multi-connected air conditioning unit

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 1 As shown, the oil volume control method of the multi-connected air-conditioning unit of the present invention, the specific steps are as follows.

[0021] a. Use an auxiliary oil return pipe 2 with an auxiliary oil return valve 1 to connect the oil separator 3 with the gas-liquid separator 4;

[0022] The inner cavity of the oil separator 3 has the same cross-sectional area from top to bottom, and the inlet of the auxiliary oil return pipe 2 is located at four-fifths of the height of the oil separator 3 .

[0023] b. Use the first pressure sensor 5 to collect the outlet pressure value of the compressor 7, and use the second pressure sensor 6 to collect the compressor 7 inlet pressure value.

[0024] c. Divide the outlet pressure value of the compressor 7 by the inlet pressure value of the compressor 7 to obtain the hig...

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Abstract

The invention discloses an oil mass regulating and controlling method for a multi-connected air conditioning unit. The oil mass regulating and controlling method includes the following concrete steps that a, an oil separator (3) and a gas-liquid separator (4) are communicated through an auxiliary oil return pipe (2); b, the outlet pressure value of a compressor (7) is collected through a first pressure sensor (5), and the inlet pressure value of the compressor (7) is collected through a second pressure sensor (6); c, the high and low pressure ratio of the compressor (7) and the unit load ratio are calculated; d, whether the two conditions that the high and low pressure ratio is larger than 2.6 for 60 min, and the load ratio of the unit is larger than 75% for 60 min are met or not is judged, and if the one or two conditions are met, the next step is executed; e, an auxiliary oil return valve (1) is opened, so that oil in the oil separator (3) is pressed into the gas-liquid separator (4). The method can prevent lubricating oil in the compressor (7) from entering a refrigerating or heating circulating pipeline.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a method for regulating the oil quantity of a multi-connected air conditioner unit. Background technique [0002] The multi-connected air conditioner unit in the prior art includes a plurality of outdoor units, a plurality of indoor units, and two refrigerant circulation main pipes connecting each indoor unit and each outdoor unit. The circulation main pipe communicates with the indoor units connected in parallel. [0003] Each outdoor unit includes compressor, oil separator, four-way reversing valve, outdoor heat exchanger (condenser in cooling mode and evaporator in heating mode), external unit electronic expansion valve and gas-liquid separator. The outlet of the compressor communicates with one end of the oil separator, the other end of the oil separator communicates with the first valve port of the four-way reversing valve, the second valve port of the four-way reversing val...

Claims

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Application Information

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IPC IPC(8): F25B31/00
Inventor 郑坚江侯丽峰涂虬李朝珍
Owner NINGBO AUX ELECTRIC
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