Lg Electronics Inc.

Joon-Hong Park

Seung-Jun Lee

Kang-Wook Cha

Young-Ju Bae

Seung-Mun An

Sang-Myung Byun

Sang-Mo Kim

Jeong-Min Han

A 2 stage rotary compressor is provided that includes a hermetic container that defines an outward appearance of the compressor; a 2 stage compression assembly provided in the hermetic container, wherein a low pressure cylinder, a middle plate, and a high pressure cylinder are successively stacked from any one of upper and lower portions; and first discharge port that discharges refrigerant compressed in the low pressure cylinder, and having an inner volume equivalent to 0.5% to 2.5% of an inner volume of the low pressure cylinder. A valve is installed on or under the discharge port. When the valve is opened, compressed refrigerant is discharged through the discharge port. When the valve is closed, refrigerant remains in the discharge port as much as the volume of the discharge port. Accordingly, refrigerant remaining in the discharge port is re-expanded in the cylinder, to thereby cause a compression loss. Moreover, in a case in which the volume of the discharge port is excessively small, a resistance occurs in a refrigerant passage. As a result, the volume of the discharge port should he appropriately restricted.

2 stage rotary compressor

A multi-stage rotary compressor comprises: a casing having a sealed space therein; a driving unit installed in the casing, for generating a driving force; a first compression unit and a second compression unit for receiving the driving force from the driving unit and compressing a refrigerant; and a connection unit for connecting the first and second compression units and guiding the refrigerant discharged from the second compression unit to be sucked directly in the first compression unit and then re-compressed, by which it is possible to vary capacity, even using every plurality of compression units, and to obtain power saving effect suitable for a saving mode.

Multi-stage rotary compressor

An air conditioner comprises: a first compression unit (C) and a second compression unit (C) for respectively compressing a refrigerant; an outdoor heat exchanger () provided at an outdoor unit and connected via the secondcontrol valve () to the first compression unit (C) and the second compression unit (C); and indoor heat exchanger () provided at an indoor unit is connected via the secondcontrol valve () to the first compression unit (C) and the second compression unit (C) and via the expansion valve () to the outdoor heat exchanger; and a first control valve () for controlling a refrigerant flow by selectively connecting the first compression unit (C) and the second compression unit (C) in series or in parallel. As the first compression unit (C) and the second compression unit (C) are selectively connected to each other in series or in parallel, a capacity of the air conditioner is varied according to a change of an indoor temperature and fabrication cost is minimized.

Air conditioner and driving method thereof

Growing community of inventors

Busan, South Korea

Joon-Hong Park