Metal melt pump

A metal melt pump comprising:

• a bottomed cylinder body including a side wall and a bottom wall;
• a melt flow passage body including a melt flow passage that connects a suction port and an ejection port, the melt flow passage body being a body separate from the bottomed cylinder body;
• and
• a melt driving part including a magnetic field device rotatably disposed around a vertically oriented rotary shaft inside the bottomed cylinder body and an electric motor that rotates the magnetic field device,
• wherein
• the suction port opens on a side surface of the melt flow passage body,
• the magnetic field device includes a plurality of permanent magnets,
• the plurality of permanent magnets each have an upper face magnetic pole and a lower face magnetic pole that are magnetized such that an upper face portion and a lower face portion become magnetic poles,
• the plurality of lower face magnetic poles of the plurality of permanent magnets vertically face the bottom wall,
• the plurality of permanent magnets are arranged such that lower face magnetic poles with different polarities are alternately arrayed along a circumference of the rotary shaft, and
• the melt flow passage body is removably provided on the bottomed cylinder body at a position below the bottomed cylinder body and where a magnetic force line from a first permanent magnet among the plurality of permanent magnets penetrates through the bottom wall of the bottomed cylinder body downward to reach the melt flow passage and penetrates from the melt flow passage through the bottom wall of the bottomed cylinder body upward to return to a second permanent magnet adjacent to the first permanent magnet,
• wherein the bottom wall of the bottomed cylinder body is provided with a projection for fixation,
• the projection for fixation engages with a recess surrounded by an inner side flow passage wall of the melt flow passage body.