回転式圧縮機

Abstract

PROBLEM TO BE SOLVED: To prevent the wear of an outer circumference of a roller piston due to shortage of the lubricating oil by opening an oil feed valve provided between an opening part in the lubricating oil in an oil feed pipe and an opening part on a suction pipe side in an interlocking manner with a defrosting detecting means to feed the lubricating oil even when the lubricating oil on the outer circumference of the roller piston is washed away. SOLUTION: In a cooling system of a refrigerator, when a compressor 1 is operated for some time, an evaporator 20 is frosted, and the frost is removed by heating the evaporator 20 by a defrosting device 21. When a defrosting means 22 detects the start of the compressor 1 next to the action signal of the defrosting device 21, an oil feed valve 23 is opened. The lubricating oil 12 of high pressure in an enclosed casing 2 flows into a suction chamber in a cylinder of low pressure passing a suction pipe 13 and a suction passage through an oil feed pipe 24, and lubricates the outer circumference of the roller piston 6. When the oil feed valve 23 is opened, a closing command delaying means 25 detects the open signal, and the oil feed valve 23 is closed after the prescribed period of time.
(57)【要約】 【課題】 回転式圧縮機に関し、ベーンとローラーピス トンの間の摩擦力増大時にローラーピストンの外周への 給油量増大によりベーン,ローラーピストンの外周の磨 耗および冷媒,潤滑油の熱分解を防ぎ、信頼性の高い回 転式圧縮機とする。 【解決手段】 密閉ケーシング2と、密閉ケーシング2 内でシリンダ5とローラーピストン6およびベーン7な どにより囲まれた吸入室10および圧縮室11と、吸入 室10と密閉ケーシング2外の冷却システムを連通する 吸入管13と、密閉ケーシング2内下部の潤滑油12内 と吸入管13を連通する給油管24と、ローラーピスト ン6とベーン7の相対速度を検出する速度検出手段28 と、速度検出手段28と連動し給油管24の潤滑油12 内開口部と吸入管13側開口部の間に設けた給油弁23 とから構成される手段とする。

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