Explosionproof control method for multi-connected air conditioning unit during refrigerant recovery
A technology of multi-connected air conditioners and control methods, which is applied in air conditioning systems, heating and ventilation control systems, heating methods, etc., can solve problems such as leakage of refrigerant, slow diffusion of refrigerant, and environmental pollution.
Active Publication Date: 2013-12-25
NINGBO AUX ELECTRIC
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Problems solved by technology
[0006] The outdoor unit modules of the prior art have the following defects when recycling refrigerant: due to the excessive amount of refrigerant recovered in some outdoor unit modules, if two of the three outdoor unit modules are broken, the refrigerant in the remaining outdoor unit module will The amount of refrigerant will increase sharply, and the diffusion speed of the refrigerant in the module is very slow, resulting in a large amount of refrigerant being accumulated in the low-pressure return pipe of the module. Once the temperature rises at this time, the liquid refrigerant will vaporize and the pressure will increase sharply, which may cause The low-pressure air return pipe bursts, which will leak refrigerant, pollute the environment, cause large economic losses, and even cause safety accidents when it bursts. Moreover, the low-pressure air return pipe needs to be repaired or replaced, which is very troublesome
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0022] Such as figure 1 , figure 2 As shown, the explosion-proof control method when the multi-connected air-conditioning unit of the present invention recycles refrigerant, its specific steps are as follows.
[0023] a. Shut down, add a first air pressure balance pipe 3 between the outdoor heat exchanger 1 and the gas-liquid separator 2 of each outdoor unit module of the unit, the first air pressure balance pipe 3 and the liquid storage Also be provided with the second air pressure balance pipe 7 that communicates both between device 4, set a critical pressure value P on the first air pressure balance pipe 3 a The mechanical pressure switch valve 8, the critical pressure value P a 4.2MPa-5.5MPa, preferably 4.5MPa; the mechanical pressure switch valve 8 of the present invention is a commercially available unloading valve with a model number...
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The invention discloses an explosionproof control method for a multi-connected air conditioning unit during refrigerant recovery. The method comprises the following steps of: 1, stopping and arranging a first air pressure balancing pipe (3) provided with a mechanical pressure switch valve (8) between an outdoor heat exchanger (1) and a gas-liquid separator (2) of each outdoor unit module; 2, closing a stop valve on a high-pressure liquid pipe (5), which is used for recovering a refrigerant, of the outdoor unit module, opening a stop valve on a low-pressure return pipe (10) of the module, and running a compressor (6) of the module to enable the module to recover the refrigerant from other parts of the unit; 3, opening the mechanical pressure switch valve (8) once the pressure value P0 of the gas-liquid separator (8) of the outdoor unit module is more than or equal to a critical pressure value Pa; and 4, stopping the compressor (6) of the outdoor unit module. By the control method, the burst of the low-pressure return pipe can be avoided.
Description
technical field [0001] The invention relates to a multi-connected air-conditioning unit, in particular to an explosion-proof control method when the multi-connected air-conditioning unit recycles refrigerant. Background technique [0002] The multi-connected air conditioner unit in the prior art includes a plurality of outdoor unit modules connected in parallel, a plurality of indoor unit modules, and two refrigerant circulation main pipes connecting each indoor unit module and each outdoor unit module, and the plurality of outdoor unit modules are connected in parallel, parallel The last outdoor unit module communicates with the parallel connected indoor unit module through two refrigerant circulation main pipes. [0003] Each outdoor unit module includes compressor, oil separator, four-way reversing valve, outdoor heat exchanger (condenser in cooling mode, evaporator in heating mode), throttling device, liquid receiver and gas-liquid separator The outlet of the compressor...
Claims
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IPC IPC(8): F24F1/06F24F11/00
Inventor 郑坚江侯丽峰赵世婷
Owner NINGBO AUX ELECTRIC