Title:
PUMP DEVICE AND AGRICULTURAL PLANT PROTECTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2020/191730
Kind Code:
A1
Abstract:
A pump device and an agricultural plant protection machine, the pump device comprising: a pump body (1) provided with a liquid inlet (11) and with a liquid outlet (12); and a pressure relief device (60), the pressure relief device comprising a primary valve (610), a pilot valve (620) connected to the primary valve, and a flow guide channel (630); the primary valve comprising a liquid inlet portion (611) communicated with the liquid outlet, a liquid outlet portion (612) communicated with the liquid inlet, and a first valve core (613); the pilot valve comprising a second valve core (621) and a first channel (622); one end of the flow guide channel being communicated with the liquid outlet, the other end being provided with a first flow guide opening (631), and the second valve core being able to seal the first flow guide opening; when hydraulic pressure in the pump body exceeds a preset pressure threshold, the second valve core, affected by a pesticide top holding force, separates from the first flow guide opening, and pesticide enters the first channel, causing a pressure difference to be formed between an end of the first valve core nearest the liquid outlet portion and an end of the first valve core furthest from the liquid outlet portion, thus achieving pressure relief.
More Like This:
| WO/2014/079625 | VALVE DEVICE FOR USE IN A FUEL INJECTION SYSTEM |
| WO/2017/187228 | HYDRAULIC PUMP WITH ISOLATED COMMUTATOR |
Inventors:
SHU ZHAN (CN)
ZHOU LE (CN)
ZHOU WANREN (CN)
ZHOU LE (CN)
ZHOU WANREN (CN)
Application Number:
PCT/CN2019/080167
Publication Date:
October 01, 2020
Filing Date:
March 28, 2019
Export Citation:
Assignee:
SZ DJI TECHNOLOGY CO LTD (CN)
International Classes:
F04B49/22; B64D1/18; F04B53/10
Foreign References:
| CN208425428U | 2019-01-25 | |||
| CN2786391Y | 2006-06-07 | |||
| CN203906931U | 2014-10-29 | |||
| CN205401290U | 2016-07-27 | |||
| CN108488455A | 2018-09-04 | |||
| CN105605263A | 2016-05-25 | |||
| CN106382401A | 2017-02-08 | |||
| CN204628673U | 2015-09-09 | |||
| US20180354624A1 | 2018-12-13 | |||
| JPH1198945A | 1999-04-13 |
Attorney, Agent or Firm:
BEIJING BESTIPR INTELLECTUAL PROPERTY LAW CORPORATION (CN)
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