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Safety control method for lubricating oil of multi-unit air conditioner of screw compressor

A screw compressor oil and screw compressor technology, applied in the direction of refrigeration safety arrangements, refrigerators, refrigeration components, etc., can solve the problem of stagnation, above the safe oil level, or the duration of the oil level below the safe oil level. More than 3 minutes and other problems, to achieve uniform distribution of lubricating oil, safe and reliable operation, and ensure the effect of lubricating oil distribution

Active Publication Date: 2013-07-10
NINGBO AUX ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the screw compressor is applied to a screw compressor multi-connected air conditioner, since one outdoor unit has to drag multiple or even more than 100 indoor units, and the distance between the indoor unit and the outdoor unit will reach more than 100 meters, at this time , a large amount of lubricating oil will be retained in the indoor evaporator and in the system pipeline, so the multi-connected air-conditioning lubricating oil safety control method in the prior art cannot solve the problem in the starting process, automatic adjustment process, shutdown process and protective adjustment process. , it must be ensured that the lubricating oil level in the screw compressor oil pool is above the safe oil level, or the oil level is below the safe oil level for no more than 3 minutes

Method used

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  • Safety control method for lubricating oil of multi-unit air conditioner of screw compressor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] As shown in the drawings, the screw compressor multi-connected air conditioner includes an outdoor unit and a multi-connected indoor unit 7, and the outdoor unit includes three screw compressors 1, an oil-gas separator 4, an air-cooled condenser 5, and a high-pressure liquid storage tank 6 and the gas-liquid separator 8, the oil pools of the screw compressors 1 are only connected by oil balance pipes; the return pipes to the respective return pipes are installed between the bottom of the oil-gas separator 4 and the return pipes of the screw compressor 1 The oil pipe 3 and the oil return electromagnetic valve 3.1 are used to send the lubricating oil at the bottom of the oil-gas separator 4 to the air return pipe of the screw compressor 1; To the gas-liquid separation oil return pipe 9 and solenoid valve 9.1 of the total air return pipe of the screw compressor 1.

[0026] A method for safety control of lubricating oil in multi-connected air conditioners of screw compresso...

Embodiment 2

[0038] A method for safety control of lubricating oil in multi-connected air conditioners of screw compressors, comprising the following steps:

[0039] 1) After the air conditioner unit is powered on, the oil heater 2 of the screw compressor 1 is in the power-on working state to heat the lubricating oil in the oil pool of the screw compressor 1; when the indoor unit 7 of the indoor unit receives the start signal, The control device of the indoor unit 7 sends a start signal to the electric control device of the screw compressor 1;

[0040] 2) When the temperature of the lubricating oil in the oil pool of the screw compressor 1 is ≥22°C, the unloading solenoid valve 10 is opened, and after the pressure difference between the high pressure HP and the low pressure LP satisfies︱HP-LP︱≤△P,△ P is 0.13MPa, start the screw compressor 1; if the temperature of the lubricating oil does not reach the set value, the screw compressor 1 is always in the standby state, and the oil heater 2 is...

Embodiment 3

[0050] A method for safety control of lubricating oil in multi-connected air conditioners of screw compressors, comprising the following steps:

[0051] 1) After the air conditioner unit is powered on, the oil heater 2 of the screw compressor 1 is in the power-on working state to heat the lubricating oil in the oil pool of the screw compressor 1; when the indoor unit 7 of the indoor unit receives the start signal, The control device of the indoor unit 7 sends a start signal to the electric control device of the screw compressor 1;

[0052] 2) When the temperature of the lubricating oil in the oil pool of the screw compressor 1 is ≥22°C, the unloading solenoid valve 10 is opened, and after the pressure difference between the high pressure HP and the low pressure LP satisfies︱HP-LP︱≤△P,△ P is 0.13MPa, start the screw compressor 1; if the temperature of the lubricating oil does not reach the set value, the screw compressor 1 is always in the standby state, and the oil heater 2 is...

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Abstract

The invention discloses a safety control method for lubricating oil of a multi-unit air conditioner of a screw compressor. The method comprises the following steps of: (1) electrifying an air conditioning unit; (2) starting the screw compressor when oil temperature of an oil sump reaches a certain value; (3) opening an oil return electromagnetic valve to replenish the oil if the oil level in the oil sump of the screw compressor is lower than a safety oil level; (4) loading in a gradient way until full load is realized when the screw compressor is started; (5) opening the oil return electromagnetic valve to replenish the oil when the oil level of the oil sump during running is lower than the safety oil level, and opening a gas separation oil return electromagnetic valve to return the oil if the load of the screw compressor is less than 20-55 percent; and (6) unloading in a gradient way until the screw compressor is stopped when the screw compressor reaches stoppage conditions. Compared with the conventional method, the method has the characteristic of guaranteeing that the oil level of the lubricating oil in the oil sump of the screw compressor is positioned above the safety oil level in a starting process, an automatic adjustment process, a stoppage process and a protective adjustment process or the time for keeping the oil level below the safety oil level does not exceed 3 minutes.

Description

technical field [0001] The invention relates to the field of air-conditioning control, in particular to a safety control method for multi-connected air-conditioning lubricating oil of screw compressors. Background technique [0002] At present, when screw compressors are used in conventional screw compressor air conditioners such as air-cooled chillers or water-cooled chillers, all components of the refrigeration cycle in the outdoor unit, such as screw compressors, oil-gas separators, and heat exchangers (shells) Tube evaporator, shell-and-tube condenser or air-cooled condenser), throttling components and connecting pipeline parts, etc., are assembled in the outdoor unit to form a whole. Therefore, the screw compressor is in the process of startup or automatic control operation In the process, the lubricating oil can be returned to the compressor smoothly, and no other special considerations are required to ensure the safety of the lubricating oil of the screw compressor. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02F04C28/28
Inventor 郑坚江程德威姜灿华
Owner NINGBO AUX ELECTRIC
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