SWING VANE-TYPE PUMP ACTUATOR WHICH PREVENTS FRETTING CORROSION

Title:

SWING VANE-TYPE PUMP ACTUATOR WHICH PREVENTS FRETTING CORROSION

Document Type and Number:

WIPO Patent Application WO/2011/129642

Kind Code:

A2

Abstract:

A test for operation over an extended period was performed on a high-power swing pump in which an independent seal device was employed, and a swing vane pump of a high-efficiency, pendulum-type wave power generating system was applied to use a swing vane-type pump actuator at a high pressure of 25MPa, as opposed to conventional, commercially available actuators. Test results showed that abrasive wear occurs by fretting corrosion at high-strength joint surfaces of hydraulic components in which a high-strength direction and a low-strength direction oppose each other. A need exists to quickly overcome abnormal wear and put a high efficiency wave power generating system into practical use. When a cylinder, the strength of which is low in the radiation direction with respect to a center shaft, and a side cover, the strength of which is high in the radiation direction, are coupled together to form joint surfaces therebetween, a cylindrical portion, which protrudes toward the cylinder, is arranged at the cylinder cover, such that the same distortion occurs to the side cover as that of the cross-section of the cylinder, which is distorted to a nearly elliptical shape by high-pressure working fluids. In addition, a pipeline, with which a low-pressure side working chamber is always in communication, is installed on the surface of a static vane fixed at the cylinder, wherein said surface of the static vane contacts the side cover.

Inventors:

WATABE TOMIJI (JP)
SHIN SEUNG-HO (KR)
HONG KEY-YONG (KR)

Application Number:

PCT/KR2011/002686

Publication Date:

October 20, 2011

Filing Date:

April 14, 2011

Export Citation:

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Assignee:

KOREA OCEAN RES DEV INST (KR)
WATABE TOMIJI (JP)
SHIN SEUNG-HO (KR)
HONG KEY-YONG (KR)

International Classes:

F04C13/00; F04C15/00; F15B15/12

Foreign References:

JP2001271735A	2001-10-05
JP2000128632A	2000-05-09
JP2002168180A	2002-06-14
JP2000403806A	2000-12-02

Other References: