Nakamura Kinzoku Kogyosho, Inc.

Nakakin Co., Ltd.

Kazuo Morita

Tokuji Yamamoto

A rotary pump having a plurality of rotor structures disposed in a pump casing, each structure having a rotor disposed in a casing, a hollow drive shaft each for driving said rotor, a headed bolt disposed within the hollow drive shaft for attaching said rotor to the drive shaft, an internally threaded rotor shaft being attached to the rotor and having said bolt threaded therein, the rotor shaft being disposed within an enlarged diameter hollow end of the hollow drive shaft, and the head of the bolt is disposed at the end of the hollow drive shaft opposite to its end to which the rotor is attached, whereby no rotor attaching means are employed on the face of the rotor opposite to the rotor shaft, and the pump casing has a flat rotor cover over the rotor structures, without any substantial spaces between the rotor cover and the rotors.

Rotary pump with shaft/rotor connection

Rotary pumps wherein the conveyed fluid, e.g. foodstuffs, entering around the rotor seats, is prevented from staying there statically, by circulating part of the fluid from the high-pressure side of the pump chamber to the low-pressure side through appropriate holes or apertures disposed around the rotor seats, and by making use of the fluid pressure itself. Washing can be carried out around the seats by circulating water that is fed to the pump, instead of the fluid, after the use of the pump has been stopped. The pumps feature a fluid circulating passage between the high-pressure side and a space in a cap portion, for purposes of cleaning that space.

Growing community of inventors

Hirakata, Japan

Kazuo Morita