POWER SOURCE-FREE DRAIN SYSTEM, COOLING SYSTEM AND COOLING METHOD

To simply make a cooling system of a diesel engine by eliminating an unnecessary auxiliary machine and power supply equipment, while greatly reducing an amount of cooling water, by constructing a primary cooling mode without the need for a secondary cooling water.SOLUTION: A drain system includes: a water supply tank 1 for an engine; a diesel engine 4 arranged in the position lower in the gravity direction than the water supply tank 1 for the engine, and having a pump 5 with a machine; a water supply pipe 7 for sending the water stored in the water supply tank 1 for the engine into the pump 5 with the machine using the gravity as the cooling water; a line pump 26 for sending the cooling water discharged from the diesel engine 4 into the diesel engine 4 again, and complementing the pressure necessary for reflow; a heat exchanger 10 for lowering temperature of the cooling water; first transportation piping (27, 28) for sending the cooling water pressurized with the line pump 26 into the heat exchanger 10; and a reflux pipe 29 for refluxing the cooling water of the temperature lowered by the heat exchanger 10 into the pump 5 with the machine. The pump 5 with the machine works by the torque generated by the diesel engine 4.SELECTED DRAWING: Figure 1 【課題】２次冷却水を必要としない１次冷却方式を構築することにより、冷却水量を大幅に低減しつつ不要な補機や電源設備を省いて簡素にディーゼル機関の冷却システムを構成する。【解決手段】機関用給水槽１と、機関用給水槽１よりも重力方向に低い位置に配置された、機付ポンプ５を有するディーゼル機関４と、機関用給水槽１に蓄えられた水を冷却水として重力で機付ポンプ５に送り込む給水管７と、ディーゼル機関４から排出された冷却水を、再度ディーゼル機関４に送り込む還流に必要な圧力を補完するラインポンプ２６と、冷却水を降温する熱交換器１０と、ラインポンプ２６で加圧された冷却水を熱交換器１０に送り込む第１の輸送配管（２７，２８）と、熱交換器１０によって降温した冷却水を機付ポンプ５に還流する還流管２９を備える。機付ポンプ５はディーゼル機関４が発生する回転力によって動作する。【選択図】 図１