Ebara Corporation

Fujitsu Corporation

Shigeru Yoshikawa

Junichi Hayakawa

Tadashi Matsuda

Tsuneo Mizuno

A sealing system includes: a double mechanical seal having a pump-side sealing mechanism () and an atmospheric-side sealing mechanism (); a pump mechanism () driven by a rotational shaft (); a first medium circulation line () for circulating a fluid barrier-and-cooling medium between a first chamber () and a second chamber (), the first medium circulation line () being coupled to the first chamber () and the second chamber (), the fluid barrier-and-cooling medium being different from a fluid handled by the centrifugal pump; a heat exchanger () and a shut-off valve () attached to the first medium circulation line (); a second medium circulation line () bypassing the shut-off valve (); and a medium pressurizing pump () and an on-off valve () attached to the second medium circulation line ().

Sealing system

A sealing system includes: a double mechanical seal having a pump-side sealing mechanism () and an atmospheric-side sealing mechanism (); a pump mechanism () driven by a rotational shaft (); a first medium circulation line () for circulating a fluid barrier-and-cooling medium between a first chamber (a) and a second chamber (b), the first medium circulation line () being coupled to the first chamber (a) and the second chamber (b), the fluid barrier-and-cooling medium being different from a fluid handled by the centrifugal pump; a heat exchanger () and a shut-off valve () attached to the first medium circulation line (); a second medium circulation line () bypassing the shut-off valve (); and a medium pressurizing pump () and an on-off valve () attached to the second medium circulation line ().

A method for driving an ink jet printer which includes an electro-mechanical transducer which is operated by electrical pulses to eject ink from an ink nozzle connected to pressure chamber wherein two successive electrical pulses are supplied to the transducer before the ejected ink is separated from the remaining ink in the pressure chamber.

Growing community of inventors

Tokyo, Japan

Shigeru Yoshikawa