AIR CONDITIONER

• Main Authors: SANADA SHINTARO, AOKI MITSUYA, HIROSAKI YU, YAMAZAKI TATSURO, ANDO SATOHIKO
• Format: Patent
• Language: English; Japanese
• Published: 27.08.2020
• Subjects: BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; WEAPONS

To provide an air conditioner capable of securing a refrigerant circulation amount necessary for a heating operation in returning to the heating operation from a defrosting operation.SOLUTION: A second opening/closing valve 29b is closed while driving a compressor 21, and keeping valves excluding the second opening/closing valve 29b in a state same as that in a defrosting operation, after termination of the defrosting operation. By driving the compressor 21 while closing both of a first opening/closing valve 29a and the second opening/closing valve 29b, a liquid refrigerant accumulated in a gas-liquid separator 28 flows out from the gas-liquid separator 28 to a second liquid branch pipe 68. Further as a second expansion valve 27b is fully opened, a gas refrigerant accumulated in the gas-liquid separator 28 flows out from the gas-liquid separator 28 to a bypass pipe 69, and is sucked into the compressor 21. After the lapse of a prescribed time from the termination of the defrosting operation, the first opening/closing valve 29a is opened in a state of closing the second opening/closing valve 29b, while fully opening both of a first expansion valve 27a and the second expansion valve 27b.SELECTED DRAWING: Figure 2 【課題】除霜運転から暖房運転に復帰した際に、暖房運転に必要な冷媒循環量を確保できる空気調和機を提供する。【解決手段】除霜運転が終了した後、圧縮機２１を駆動させたまま、および、第２開閉弁２９ｂ以外の各弁を除霜運転時と同じ状態に維持したまま、第２開閉弁２９ｂを閉じる。第１開閉弁２９ａと第２開閉弁２９ｂとをともに閉じて圧縮機２１を駆動することによって、気液分離器２８に滞留する液冷媒が、気液分離器２８から第２液分管６８へと流出する。また、第２膨張弁２７ｂも全開とされているので、気液分離器２８に滞留するガス冷媒が、気液分離器２８からバイパス管６９へと流出して圧縮機２１に吸入される。除霜運転が終了してから所定時間が経過した後、第２開閉弁２９ｂを閉じた状態、および、第１膨張弁２７ａの開度と第２膨張弁２７ｂの開度をともに全開としたまま、第１開閉弁２９ａを開く。【選択図】図２