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Patent Searching and Data


Title:
PRESSURE RELIEF DEVICE FOR HYDRAULIC MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/090352
Kind Code:
A1
Abstract:
A pressure relief device for a hydraulic machine. The bottom of an oil tank (1) is in communication with an inlet of a prefill valve (D1), an outlet of the prefill valve (D1) is in communication with an upper chamber of a master cylinder (2), and a hydraulic control port of the prefill valve (D1) is connected to an outlet of a gear pump (B1) by means of a two-position four-way solenoid directional valve (YV1). The device is also provided with a cartridge valve (C1) and a two-position three-way solenoid ball valve (YA1); an oil port B of the cartridge valve (C1) is connected to the upper chamber of the master cylinder (2) by means of a pressure relief oil pipe (3), an oil port A of the cartridge valve (C1) is connected to the oil tank (1), the hydraulic control port of the cartridge valve (C1) is connected to the oil port A of the two-position three-way solenoid ball valve (YA1), an oil port P of the two-position three-way solenoid ball valve (YA1) is connected to the pressure relief oil pipe (3), an oil port T of the two-position three-way solenoid ball valve (YA1) is connected to the oil tank (1); the two-position three-way solenoid ball valve (YA1) is in the open state during power failure. When a valve spool of the prefill valve (D1) is stuck, the two-position three-way solenoid ball valve (YA1) is energized, the oil port A of the two-position three-way solenoid ball valve (YA1) is in communication with the oil port T, the hydraulic control port of the cartridge valve (C1) is depressurized, such that the cartridge valve (C1) is open, and the upper chamber of the master cylinder (2) is able to return oil to the oil tank (1) to release pressure by means of the pressure relief oil pipe (3).

Inventors:
CHEN LIANGJUAN (CN)
Application Number:
PCT/CN2016/106515
Publication Date:
May 24, 2018
Filing Date:
November 20, 2016
Export Citation:
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Assignee:
CHEN LIANGJUAN (CN)
International Classes:
B30B15/16
Foreign References:
CN102794381A2012-11-28
CN202741655U2013-02-20
CN202862614U2013-04-10
CN103552276A2014-02-05
CN203962571U2014-11-26
CN202062696U2011-12-07
JPH09314391A1997-12-09
Attorney, Agent or Firm:
NANJING SUKE PATENT AGENT CO., LTD. (CN)
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