US 12,168,978 B2
Pump unit for miniature cleaning machine
Changguo Luo, Zhejiang (CN); Yubo Chen, Zhejiang (CN); and Yongsheng Zhao, Zhejiang (CN)
Assigned to LUTIAN MACHINERY CO., LTD., Zhejiang (CN)
Appl. No. 17/912,649
Filed by LUTIAN MACHINERY CO., LTD., Zhejiang (CN)
PCT Filed Nov. 8, 2021, PCT No. PCT/CN2021/129404
§ 371(c)(1), (2) Date Sep. 19, 2022,
PCT Pub. No. WO2022/188447, PCT Pub. Date Sep. 15, 2022.
Claims priority of application No. 202120503854.7 (CN), filed on Mar. 9, 2021.
Prior Publication US 2023/0134911 A1, May 4, 2023
Int. Cl. F04B 17/03 (2006.01); B08B 3/02 (2006.01); F04B 9/04 (2006.01)
CPC F04B 9/045 (2013.01) [B08B 3/028 (2013.01); F04B 17/03 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A pump unit for a miniature cleaning machine, comprising:
a motor (1), a pump shell (2), a plunger (3) and a transmission assembly (4), the plunger (3) and the transmission assembly (4) are arranged in the pump shell (2), a reset spring (5) enabling the plunger (3) to always have the upward moving trend is arranged in the pump shell (2), wherein the transmission assembly (4) comprises a pump main shaft (40), an eccentric shaft (41) and a ball bearing (42), one end of the pump main shaft (40) is in transmission connection with the motor (1), and the other end of the pump main shaft (40) is in transmission connection with one end of the eccentric shaft (41), the other end of the eccentric shaft (41) is connected to the pump shell (2), the eccentric shaft (41) is sleeved with the ball bearing (42), and a peripheral face of the ball bearing (42) is attached to an upper end face of the plunger (3),
wherein the plunger (3) comprises a plunger sleeve (30) and a plunger plug (31) connected to the plunger sleeve (30), an upper portion of the reset spring (5) is sleeved on a peripheral face of the plunger plug (31), and an upper end of the reset spring (5) abuts against a lower end face of the plunger sleeve (30).