| 摘要 |
PROBLEM TO BE SOLVED: To improve the mass productivity and reduce the cost by constituting a resin-made casing having an opening from an inner casing consisting of the combination of a plurality of preliminarily resin-molded split inner casings and an outer casing for covering at least the outer surface thereof. SOLUTION: This pump casing 10 in a double volute pump is formed of a resin-made inner casing 16 including a volute 14 having two passages 14a, 14b with a bulkhead 12 in between, and a resin-made outer casing 18 for covering the outside of the inner casing 16 so as to enclose it. The outer casing 18 has a suction port on one axial end surface 20, and the tip end surface 24 of the volute 14 has a discharge port. The inner casing 16 is formed of split inner casings 16a, 16b divided into two, and the outer casing 18 is resin-molded so as to cover the outer surface of the inner casing 16. |
