Pump impeller
First Claim
1. A pump impeller manufactured by press forming of steel plate and comprising a boss formed with a central bore for connecting said boss to a main shaft of said pump through key and key way engagement, and a main shroud fixed to said boss, said impeller characterized in that said boss is formed with a polygonal portion on the periphery of said boss, that said main shroud is formed at central portion thereof with a polygonal recess fitting to said polygonal portion of said boss, that a retainer plate is mounted on said boss at an end portion thereof opposite to an end portion from which said main shroud is fitted to said boss, and that said retainer plate is connected by welding to said main shroud.
1 Assignment
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Accused Products
Abstract
A pump impeller manufactured by press forming of steel plate and comprising a boss formed with a central bore for connecting the boss to a main shaft of the pump through key and key way engagement, and a main shroud fixed to the boss is disclosed. The impeller is characterized in that the boss is formed with a polygonal portion on the periphery of the boss and the main shroud is formed at central portion thereof with a polygonal recess fitting to the polygonal portion of the boss. A retainer plate is mounted on the boss at an end portion thereof opposite to an end portion from which the main shroud is fitted to the boss and is connected by welding to the main shroud. Thereby, since the power is transmitted from the boss to the main shroud through polygonal surfaces, no substantial stress concentration occurs at the power transmitting area.
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Citations
10 Claims
- 1. A pump impeller manufactured by press forming of steel plate and comprising a boss formed with a central bore for connecting said boss to a main shaft of said pump through key and key way engagement, and a main shroud fixed to said boss, said impeller characterized in that said boss is formed with a polygonal portion on the periphery of said boss, that said main shroud is formed at central portion thereof with a polygonal recess fitting to said polygonal portion of said boss, that a retainer plate is mounted on said boss at an end portion thereof opposite to an end portion from which said main shroud is fitted to said boss, and that said retainer plate is connected by welding to said main shroud.
Specification