Title:
UNLOADING VALVE AND COMBINED-VALVE-TYPE BUFFER OIL CYLINDER
Document Type and Number:
WIPO Patent Application WO/2022/095530
Kind Code:
A1
Abstract:
An unloading valve and a combined-valve-type buffer oil cylinder, relating to the field of hydraulic oil cylinders. The unloading valve comprises a valve body, a valve core (10) and a return spring (16), and is further provided with a damping hole (15) and an unloading groove (13); a combined valve comprises the unloading valve and a throttling valve, wherein the throttling valve comprises a buffer plug (4) and a buffer cavity (9); a piston rod assembly of the combined-valve-type buffer oil cylinder is mounted in a cylinder body, the cylinder body comprises a cylinder head flange (2), a cylinder bottom (7) and a cylinder barrel (3), and the piston rod assembly comprises a guide sleeve (1), a piston (5) and a piston rod (6); and the combined valve is arranged on an oil cylinder. According to the technical solution, an unloading function of an oil inlet cavity is added, a buffering effect is significant, and a buffering pressure is reduced; in addition, the system is in an unloading state in a buffer stage, energy loss and system heating of the system are reduced, pressure impact caused by buffering on the system is avoided, reliability of the system is improved, and the difficulty of performance matching, mounting and debugging of an original buffer valve is reduced.
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Inventors:
ZHU DEWEI (CN)
RONG XIAOYU (CN)
RONG XIAOYU (CN)
Application Number:
PCT/CN2021/111710
Publication Date:
May 12, 2022
Filing Date:
August 10, 2021
Export Citation:
Assignee:
QINGDAO ACME INNOVATION TECH CO LTD (CN)
International Classes:
F15B15/14; F15B15/22
Foreign References:
| CN112196861A | 2021-01-08 | |||
| CN102537636A | 2012-07-04 | |||
| CN202419103U | 2012-09-05 | |||
| CN103438050A | 2013-12-11 | |||
| CN103912534A | 2014-07-09 | |||
| CN101475022A | 2009-07-08 | |||
| JP2001343079A | 2001-12-14 | |||
| US6805148B2 | 2004-10-19 | |||
| CN201610419750A | 2016-06-16 | |||
| CN202010751295A | 2020-07-30 | |||
| CN202021559346U | 2020-07-30 |
Other References:
See also references of EP 4160027A4
Attorney, Agent or Firm:
QINGDAO FIRST PATENT & TRADEMARK AGENT CO., LTD. (CN)
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