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Cooling mode start-up control method for screw-compression multi-connected central air conditioner

A technology of screw compressor and refrigeration mode, which is applied in heating and ventilation control systems, heating methods, space heating and ventilation, etc. It can solve the problems of unseen stability and reliability start-up methods, and achieve start-up stability and High reliability, compressor protection, good starting stability and reliability

Active Publication Date: 2011-09-21
NINGBO AUX ELECTRIC
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Problems solved by technology

[0003] Although the screw-type compression multi-connected central air conditioner has great advantages, how to control how to start it safely and reliably in the cooling mode has not been seen in the prior art with good stability and reliability. The starting method has become One of the hotspots in the study of screw compression multi-connected central air conditioners

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  • Cooling mode start-up control method for screw-compression multi-connected central air conditioner
  • Cooling mode start-up control method for screw-compression multi-connected central air conditioner

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Embodiment Construction

[0035] The start-up control method of the refrigeration mode of the screw-type compression multi-connected central air conditioner of the present invention, when the outdoor unit control unit receives the refrigeration start-up signal, executes the following start-up process:

[0036] (1) When the control unit confirms that the oil temperature of the screw compressor 1 is ≥ T0 through the detection of the oil temperature sensor 1.1, and the value range of T0 is 20-25°C, the control unit controls the unloading solenoid valve 2 to open to adjust the high pressure of the system and the pressure difference of the low pressure;

[0037] (2) When the absolute value of the pressure difference between the high pressure and low pressure of the system is less than or equal to the startup threshold, the startup threshold varies with different refrigerants and can be obtained through on-site testing. For example, the startup threshold of R22 refrigerant is generally 0.13MP, The starting t...

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Abstract

The invention discloses a cooling mode start-up control method for a screw-compression multi-connected central air conditioner with good stability and reliability. By controlling the accurate action and the mutual coordination of key members during start-up, the start-up stability and reliability are good; besides, experimental results show that the start-up stability and reliability reach a relatively high level.

Description

technical field [0001] The invention relates to the technical field of air-conditioning systems, in particular to a start-up control method for a refrigeration mode of a screw-type compression multi-connected central air conditioner. Background technique [0002] At present, there is a screw-type compression multi-connected central air conditioner, which breaks through the limitations of the existing conventional VRV modular combination multi-connected air conditioners, that is, the outdoor unit capacity of the screw-type compressed multi-connected central air conditioner ranges from 60HP, 70HP, 80HP, 90HP, 110HP, 125HP, etc., the maximum capacity of the outdoor unit with three screw compressors connected in parallel can reach 400HP, which breaks through the limitation that the maximum capacity of the conventional VRV multi-connected air conditioner is only 64HP; at the same time, the screw compressor multi-connected central There is no combination of basic modules in the ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00
Inventor 郑坚江程德威姜灿华
Owner NINGBO AUX ELECTRIC
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