Title:
PLUNGER PUMP, PLANT-PROTECTION UNMANNED AERIAL VEHICLE, AND SPRAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/095071
Kind Code:
A1
Abstract:
The present application provides a plunger pump, a plant-protection unmanned aerial vehicle, and a spray device. The plunger pump comprises: a plunger cavity, provided with a liquid inlet and a liquid outlet; a plunger structure at least partially received in the plunger cavity and capable of performing reciprocating motion in the plunger cavity to suck liquid from the liquid inlet and discharge the liquid from the liquid outlet; and a seal member in sealable engagement with the plunger structure. The seal member comprises: an annular body portion having a first side and a second side along an axial direction, and an inner side and an outer side along a radial direction; a first seal portion extending, from the surface of the first side of the annular body portion, in a direction away from the first side and being configured to be adjacent to the inner side of the annular body portion; and a second seal portion extending, from the surface of first side of the annular body portion, in a direction away from the first side and being configured to be adjacent to the outer side of the annular body portion. The first seal portion and the second seal portion are spaced apart to form a notch on the first side of the annular body portion, and the first seal portion and the second seal portion are configured in an asymmetric structure, thus improving a sealing effect and the wear resistance.
Inventors:
SHU ZHAN (CN)
ZHOU LE (CN)
GAO JUNZHANG (CN)
ZHOU LE (CN)
GAO JUNZHANG (CN)
Application Number:
PCT/CN2020/127642
Publication Date:
May 12, 2022
Filing Date:
November 09, 2020
Export Citation:
Assignee:
SZ DJI TECHNOLOGY CO LTD (CN)
International Classes:
F04B53/02; F04B1/16
Foreign References:
| CN211258979U | 2020-08-14 | |||
| CN111237466A | 2020-06-05 | |||
| CN210928965U | 2020-07-07 | |||
| CN2481870Y | 2002-03-13 | |||
| CN2101776U | 1992-04-15 | |||
| CN105756878A | 2016-07-13 | |||
| US20180298885A1 | 2018-10-18 | |||
| US20150110654A1 | 2015-04-23 |
Attorney, Agent or Firm:
BEIJING BESTIPR INTELLECTUAL PROPERTY LAW CORPORATION (CN)
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