US 12,138,645 B2
Liquid pump
Ming Kei Wu, Jiangsu (CN)
Assigned to HCP PACKAGING CO., LTD., Jiangsu (CN)
Appl. No. 17/790,356
Filed by HCP PACKAGING CO., LTD., Jiangsu (CN)
PCT Filed Feb. 5, 2021, PCT No. PCT/CN2021/075514
§ 371(c)(1), (2) Date Jun. 30, 2022,
PCT Pub. No. WO2022/156007, PCT Pub. Date Jul. 28, 2022.
Claims priority of application No. 202110088197.9 (CN), filed on Jan. 22, 2021.
Prior Publication US 2023/0241633 A1, Aug. 3, 2023
Int. Cl. B05B 11/10 (2023.01); B05B 11/00 (2023.01)
CPC B05B 11/1069 (2023.01) [B05B 11/1074 (2023.01); B05B 11/0044 (2018.08)] 14 Claims
OG exemplary drawing
 
1. A liquid pump, comprising:
a pump body;
a valve seat, the valve seat being mounted at a lower end portion of the pump body, wherein the pump body is an integral part integrally formed by a same material, the pump body comprising a shell with a hollow pump cavity and an elastic valve plate disposed at a bottom end portion of the shell, and the elastic valve plate is provided with a valve passage, the valve seat being disposed below the elastic valve plate in a fitted manner, the valve seat comprising a valve body with a liquid flow passage, and a top of the valve body is provided with a seal structure that can be fitted with the elastic valve plate in a sealed manner;
a piston;
a piston rod, the piston rod comprises a rod body and a piston head fixedly disposed on a lower end of the rod body, the rod body is provided with a liquid outlet channel extending in an axial direction, and a lower portion of the rod body is opened with a liquid outlet hole communicating with the liquid outlet channel, the piston having an inner piston body and an outer piston body that are coaxially and fixedly disposed, the inner piston body is disposed on the rod body in a sliding fit, and the outer piston body is disposed in the hollow pump cavity of the pump body in a sliding fit, wherein an annular groove is formed between the piston head and the rod body, into which a lower end portion of the inner piston body can be inserted in a fitted manner;
a connecting rod, the connecting rod having a mounting hole extending in the axial direction, the rod body of the piston rod passes through the mounting hole in a fitted manner in the axial direction, clamping structures fitted with each other are provided between an outer peripheral portion of the piston rod and an inner peripheral wall of the mounting hole;
a lock cover, the lock cover fixedly disposed on an upper end portion of the pump body, the connecting rod and the lock cover are in a sliding fit, and the lock cover is provided with a through hole penetrating in the axial direction, the connecting rod passes through the through hole in a sliding fit in the axial direction, and the liquid pump further comprising an elastic member disposed between an upper end portion of the lock cover and an upper end portion of the connecting rod and providing a force required for the connecting rod to move upward, a lower end portion of the connecting rod has a limit protruding platform protruding outward along an outer peripheral wall of the connecting rod, an outer diameter of the limit protruding platform is larger than an aperture of the through hole, and the limit protruding platform is located below the lock cover; and
an elastic member, the elastic member disposed between the lock cover and the connecting rod and providing a force required for the connecting rod to move upward and away from the lock cover.