公开(公告)号：US20190011159A1

公开(公告)日：2019-01-10

申请号：US16029691

申请日：2018-07-09

Applicant: LG Electronics Inc.

Inventor： Kang Wook LEE ,  Soojin KANG ,  Hansaem PARK ,  Ho Jong JEONG

IPC: F25B49/02 ,  F25B1/04 ,  F25B40/02 ,  F25B40/06

Abstract: An air conditioning device includes a vapor injection cycle in which an operating speed of a compressor is adjusted to improve efficiency, and a method for controlling the device. The air conditioning device includes an inner heat-exchanger for exchanging heat between a first portion of refrigerant passing through a condenser and a second portion of the refrigerant branched from the first refrigerant, and an injection channel through which the second portion of the refrigerant is injected into the compressor. The inner heat exchanger includes an outer tube and an inner tube disposed inside the outer tube. The first portion of the refrigerant flows into the inner tube, while the second portion of the refrigerant flows into the outer tube. Thus, when a variation of air-conditioning load is small and an injection super-heating temperature is low, the device enables reduction of the compressor rotation speed to ensure high injection super-heating temperature.