ELECTROMAGNETIC PUMP AND COMBUSTION DEVICE EMPLOYING THE SAME

To increase a return quantity of fuel from an oil feeding pipe during an operation stop time of a combustion device and secure stability in fuel supply in a driving time of the combustion device in an electromagnetic pump.SOLUTION: An electromagnetic pump 1 comprises: a suction joint 2; a discharge joint 3; a tubular cylinder 4 disposed therebetween; an electromagnetic coil 5 which generates a magnetic force in an intermittent manner in the cylinder 4; a plunger 6 which is disposed inside of the cylinder 4 and moved reciprocally by the magnetic force of the electromagnetic coil 5; a suction check valve unit 8 which is disposed within the plunger 6; a discharge check valve unit 33 which is provided within the discharge joint 3 and discharges a fluid (fuel) sucked by the plunger 6; and a push-up member 9 which is disposed on an end portion of the plunger 6 and pushes up the discharge check valve unit 33 so as to open the same. The suction check valve unit 8 includes a suction valve 81, a suction valve seat 82, and a bypass flow passage 80 in which the fuel is communicated between the inside of the plunger 6 and the suction joint 2 when the suction valve 81 is pressed by the suction valve seat 82.SELECTED DRAWING: Figure 2 【課題】電磁ポンプにおいて、燃焼装置の運転停止時に、送油管からの燃料の戻り量を多くし、且つ駆動時の燃料供給の安定性を確保する。【解決手段】電磁ポンプ１は、吸入ジョイント２と、吐出ジョイント３と、それらの間に配設された管状のシリンダ４と、シリンダ４に間欠的に磁力を発生させる電磁コイル５と、シリンダ４の内側に配設され電磁コイル５の磁力により往復動するプランジャ６と、プランジャ６内部に設けられ設された吸入逆止弁部８と、吐出ジョイント３内部に設けられプランジャ６で吸引した流体（燃料）を吐出するた吐出逆止弁部３３と、プランジャ６の端部に配設され吐出逆止弁部３３を開成可能にすべく突き上げる突上部材９と、を備える。また、吸入逆止弁部８は、吸入弁８１と、吸入弁座８２と、吸入弁８１が吸入弁座８２に押圧されたときにプランジャ６内と吸入ジョイント２との間で燃料を連通させるバイパス流路８０と、を有する。【選択図】図２