Title:
HYDRAULIC DEVICE FOR DRIVING OIL WELL PUMP
Document Type and Number:
WIPO Patent Application WO/2014/141426
Kind Code:
A1
Abstract:
This hydraulic device for driving an oil well pump is provided, as a pump main body within a single housing by means of a single unit structure, with at least a bidirectional variable-capacity piston pump, a discharge quantity detection unit, a discharge pressure detection unit, and a magnetic proportional control valve. Within the pump main body are provided: a connection section that is provided to the housing side surface and to which the pump discharge duct of an external pilot hydraulic circuit is connected; and a second pilot duct that leads an external pilot pressure from the connection section to a pilot duct between the magnetic proportional control valve and the discharge duct of the piston pump. A means that mechanically cuts off the supply of the external pilot pressure at the point in time when the discharge pressure of the piston pump becomes no greater than a preset pressure is further provided on the second pilot duct. As a result, it is possible, by means of a simple configuration that does not lead to increased cost and that does not rely on electrical control, to provide a hydraulic device that is for driving an oil well pump and that can avoid the occurrence of cavitation even if a control system halts.
Inventors:
HIRAIDE HIROKAZU (JP)
HAYASHI AKIHIRO (JP)
HAYASHI AKIHIRO (JP)
Application Number:
PCT/JP2013/057166
Publication Date:
September 18, 2014
Filing Date:
March 14, 2013
Export Citation:
Assignee:
YUKEN KOGYO CO LTD (JP)
International Classes:
F04B49/10; E21B43/00; F04B1/20; F04B1/26; F15B11/00
Foreign References:
| JP2011526972A | 2011-10-20 | |||
| JPS5648494A | 1981-05-01 | |||
| JPH08261158A | 1996-10-08 | |||
| JPH08232853A | 1996-09-10 |
Attorney, Agent or Firm:
HANAMURA, Futoshi (JP)
Futoshi Hanamura (JP)
Futoshi Hanamura (JP)
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