Oil return device and oil recovery method for frequency conversion multi-connected air conditioner unit

Abstract

The invention discloses an oil returning device of a frequency conversion multi-union air conditioning unit. The oil returning device is characterized in that an air outlet I (5) of a fixed frequency compressor (3) is communicated with an air inlet pipe I (7) arranged on the side face of an oil separator I (1) through an air outlet pipe I (6), an air outlet II (8) of a variable frequency compressor (4) is communicated with an air inlet pipe II (10) arranged on the side face of an oil separator II (2) through an air outlet pipe II (9), an exhaust pipe I (11) arranged at the upper end of the oil separator I (1) is arranged in parallel to an exhaust pipe II (12) arranged at the upper end of the oil separator II (2), an oil returning port I (13) arranged at the lower end of the oil separator I (1) is communicated with an oil inlet II (14) of the variable frequency compressor (4), and an oil returning port II (15) arranged at the lower end of the oil separator II (2) is communicated with an oil inlet I (29) of the fixed frequency compressor (3). The invention also discloses an oil recovering method of the frequency conversion multi-union air conditioning unit, by the method, the oil level of the fixed frequency compressor (3) and the variable frequency compressor (4) can be recovered.

Description

technical field [0001] The invention relates to an oil return device of a frequency conversion multi-connected air conditioner unit and an oil recovery method thereof. Background technique [0002] Such as figure 1 As shown, the free separator 1' in the oil return device of the current frequency conversion multi-connected air-conditioning unit is filtered by several layers of wire mesh 2' when the intake air is used to separate the lubricating oil mixed in the gas refrigerant, and The drips gather at the bottom of the container 3'. When the accumulated lubricating oil reaches a certain height, it returns to the crankcase of the compressor through the oil return capillary 4'. Although this oil separator has a simple structure and a manufacturing method, it has a good oil separation effect. Not high, when two compressors are connected in parallel, due to different displacements, it is easy to cause oil bias. After the inverter compressor runs at low frequency for a long time,...

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Problems solved by technology

[0002] like figure 1 As shown, the free separator 1' in the oil return device of the current frequency conversion multi-connected air-conditioning unit is filtered by several layers of wire mesh 2' when the intake air is used to separate the lubricating oil mixed in the gas refrigerant, and The drips gather at the bottom of the container 3'. When the accumulated lubricating oil reaches a certain height, it returns to the crankcase of the compressor through the oil return capillary 4'. Although this oil separator has a simple structure and a manufacturing method, it has a good oil separation effect. Not high, when two compressors are connected in parallel, due to different displacements, it is easy to cause oil bias. After the inverter compressor runs at low frequency for a long time, the oil level of the compressor is likely to drop, and the oil will accumulate in the system. , which is unfavorable to the operation of the compressor and is easy to damage the compressor

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