SELF-PRIMING CENTRIFUGAL PUMP

摘要

A pump with high performance and cleanability includes a casing having a smaller volute and a larger volute; a space between an outer circumference of an impeller and a starting end of the smaller volute being greater than that of the larger volute, generating a circulating flow of self-priming water from the smaller volute to the larger volute; and a diffusing part of the larger volute being formed into an upright, cylindrical self-priming water separating chamber guiding the self-priming water from the smaller volute to flow in for air-water separation. An inner circumference part of the casing is formed concentric with the outer circumference of the impeller with a predetermined space therebetween; defining members are protrusively disposed on the inner circumference part of the casing so as to define the shapes of the two volutes; and the self-priming water separating chamber is made attachable to and detachable from the casing.

主权项

1. A self-priming centrifugal pump comprising:
a pump casing having a smaller volute and a larger volute; a space being formed between an outer circumference of an impeller and a starting end of the smaller volute, said space being greater than a space between the outer circumference of the impeller and a starting end of the larger volute, generating a circulating current of self-priming water flowing from the smaller volute to the larger volute; a diffusing part of the larger volute being formed into an upright, cylindrical self-priming water separating chamber into which the current of the self-priming water from the smaller volute is guided to flow so that air-water separation of the self-priming water is carried out in the self-priming water separating chamber: characterized in that an inner circumference part of the casing is formed in a circular shape concentric with the outer circumference part of the impeller with a predetermined interval therebetween, and, in the annular space formed between the inner circumference part of the casing and the outer circumference part of the impeller, defining members are disposed on the inner circumference part of the casing so as to be protruded inward toward the vicinity of the outer circumference part of the impeller whereby the defining members define the shapes of the smaller volute and the larger volute; and respective passages from the smaller volute and the larger volute toward the self-priming water separating chamber are respectively separated into connectable members whereby the self-priming water separating chamber is enabled to be attached to and detached from the casing.