multi-stage high-pressure water pump of a centrifugal type

摘要

The present invention can improve the performance of the pump by greatly reducing the flow loss to the hydraulic loss, it provides a centrifugal multi-stage high pressure water supply pump that can be greatly miniaturized with the same performance and the manufacturing cost can be low.;The centrifugal multistage high pressure water supply pump is provided with at least two stages of impellers 21 so as to rotate together on the rotating shaft 12 of the motor portion 11, and an upstream side of the upstream impellers 21 of the impellers 21. In the inlet 13 is fixed to the inlet casing 30 is formed in the center, the pumping guide member 25 and the sealing plate to guide the high pressure water discharged to the outer periphery of the upstream impeller 21 downstream 23 is fixedly installed between the upstream side impeller 21 and the downstream side impeller 21, and the pumping guide member to guide and discharge the high pressure water discharged to the outer periphery of the downstream side impeller 21 downstream ( A discharge port casing 40 having a discharge port 14 at its periphery 25 is provided to be fixed downstream of its downstream impeller 21, and the impeller 21 has a plurality of centrifugal plates in the front and rear plates thereof. It is fixed with the impeller blades in between, the inlet is formed at the center of the front plate, and the rear plate is rotated. In at least two or more stages of centrifugal multistage high-pressure water supply pumps installed to rotate together with (12), the pumping guide member 25 includes: an outer circumferential flange 25a that surrounds the outer circumference of the impeller 21 at regular intervals; The through hole 25e for guiding the high pressure water discharged outward from the impeller 21 to the rear (downstream direction) is formed, is in airtight contact with the impeller 21 on one surface, and with respect to the rotary shaft 12. The disk 25b in the outer circumferential flange 25a in which the sliding hole 25c is formed in the center so as to have a sliding rotational relationship, and the high pressure water formed on the other surface of the disk 25b and passed through the through hole 25e. It is characterized by consisting of a guide blade (25d) for guiding in the center direction between the sealing plate 23 and the discharge port casing (40).