US 11,708,822 B2
Handheld high-pressure cleaning machine
Pinghua Wu, Suzhou (CN); Yong Qiao, Suzhou (CN); and Haijun Zhang, Suzhou (CN)
Assigned to Positec Power Tools (Suzhou) Co., Ltd., Suzhou (CN)
Filed by Positec Power Tools (Suzhou) Co., Ltd., Suzhou (CN)
Filed on Mar. 4, 2021, as Appl. No. 17/192,002.
Application 17/192,002 is a continuation of application No. 15/518,205, granted, now 10,968,899, previously published as PCT/CN2016/106663, filed on Nov. 21, 2016.
Claims priority of application No. 201510810513.3 (CN), filed on Nov. 20, 2015.
Prior Publication US 2021/0190048 A1, Jun. 24, 2021
Int. Cl. B08B 3/02 (2006.01); F04B 1/16 (2006.01); F04B 19/22 (2006.01); F04C 18/077 (2006.01); F04C 18/07 (2006.01); F04B 17/03 (2006.01); F04B 53/14 (2006.01); F04B 17/06 (2006.01); F04B 53/06 (2006.01)
CPC F04B 1/16 (2013.01) [B08B 3/026 (2013.01); F04B 17/03 (2013.01); F04B 17/06 (2013.01); F04B 19/22 (2013.01); F04B 53/06 (2013.01); F04B 53/14 (2013.01); F04B 53/144 (2013.01); F04C 18/07 (2013.01); F04C 18/077 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A handheld cleaning machine powered by direct current, and connectable to an external water source using a water pipe; wherein the handheld cleaning machine comprises a spray gun comprising:
a housing, wherein a motor and a pump driven by the motor are provided in the housing;
a handle having a front end and a rear end with the front end of the handle formed on or connected to the housing;
a detachable rechargeable battery pack coupled externally to the handle; and
a nozzle connected to a water outlet of the pump whereby water from the external water source may be sprayed out through the nozzle;
wherein the pump comprises a central chamber, a water inlet, the water outlet and a single plunger, a water inlet chamber connected to the water inlet, and a water outlet chamber connected to the water outlet, and wherein the plunger is disposed in the central chamber and is driven by the motor to perform reciprocating motion in the central chamber;
wherein the water inlet chamber and the water outlet chamber are located at one side of the plunger closer to the nozzle, and the external water enters the water inlet chamber through the water inlet, is discharged from the water outlet chamber after being pressurized by the central chamber, and is sprayed outward through the nozzle;
wherein the pump further comprises a pump body, a first pump cover and a second pump cover, and the first pump cover and the second pump cover are detachably installed on both sides of the pump body; and
wherein each of the first pump cover and the second pump cover comprises a connection channel, and the water inlet chamber and the water outlet chamber are connected to the central chamber through the connection channel.