Buffered pump system

Patent metadata

Field	Value
Publication number	US-2025270985-A1
Application number	US-202519206113-A
Country	US
Kind code	A1
Filing date	May 13, 2025
Priority date	Jun 25, 2019
Publication date	Aug 28, 2025
Grant date	—

Abstract

A pump including an inlet one-way valve; a pump chamber downstream of and in fluid communication with the inlet one-way valve; a piston slideably engaged with the pump chamber; a piston cavity within the piston and in fluid communication with the pump chamber; a liquid accumulator operable within the piston cavity; an actuator engaged with piston; and an outlet one-way valve downstream of and in fluid communication with the pump chamber.

First claim

What is claimed is:

1 . A pump comprising:
an inlet one-way valve; a pump chamber downstream of and in fluid communication with the inlet one-way valve, wherein the pump chamber comprises a piston bore having a length from about 5 to about 35 mm and an open cross section area of from about 4 to about 500 cm 2 ; a piston slideably engaged with the piston bore of the pump chamber, wherein the piston defines a piston cavity that is in fluid communication with the pump chamber; a liquid accumulator operable within the piston cavity; an outlet one-way valve downstream of and in fluid communication with the pump chamber; a housing containing the pump chamber, the piston, the piston cavity, and the liquid accumulator; and an actuator engaged with the piston, wherein the actuator extends from outside of the housing into the housing beyond the pump chamber, wherein:
the pump chamber has an upstroke pump chamber volume and the piston cavity has a piston cavity volume from about 0.1 to about 4 mL, and
the piston cavity volume is from about 0.2 to about 0.8 of the upstroke pump chamber volume.

2 . The pump of claim 1 , wherein the piston cavity is defined by a piston cavity opening oriented towards the pump chamber and a piston cavity closed end oriented towards the actuator and a piston cavity peripheral wall extending from the piston cavity closed end to the piston cavity opening.

3 . The pump of claim 2 , wherein the piston cavity peripheral wall is slideably engaged with the pump chamber.

4 . The pump of claim 2 , wherein the pump further comprises a resilient member engaged with the actuator; wherein the pump chamber has a pump chamber volume that is a function of position of the piston; and wherein the resilient member is biased to expand the pump chamber volume.

5 . The pump of claim 4 , wherein the actuator is a trigger.

6 . The pump of claim 5 , wherein the piston cavity peripheral wall is slideably engaged with the pump chamber.

7 . The pump of claim 6 , wherein the resilient member is outside of the pump chamber.

8 . The pump of claim 7 , wherein the outlet one-way valve is a precompression valve.

9 . The pump of claim 8 , wherein the liquid accumulator is selected from the group consisting of a bladder accumulator, diaphragm accumulator, gas filled piston accumulator, spring type accumulator, and compressible medium accumulator.

10 . The pump of claim 8 , wherein the liquid accumulator is a bladder accumulator.

11 . The pump of claim 1 , wherein the actuator is an external surface of the piston.

12 . The pump of claim 1 , wherein the liquid accumulator is selected from the group consisting of a bladder accumulator, diaphragm accumulator, gas filled piston accumulator, spring type accumulator, and compressible medium accumulator.

13 . The pump of claim 1 , wherein the actuator is a trigger.

14 . The pump of claim 1 , wherein the pump further comprises a dip tube upstream of the inlet one-way valve.

15 . The pump of claim 1 , wherein the liquid accumulator is a bladder accumulator positioned entirely within the piston cavity.

Assignees

• Procter & Gamble

Inventors

• Bauer Matthew Stephen
• Lane Richard Lee
• Lewis Cody Dylan
• Morley James Alexander

Classifications

• B05B11/1069

  the valve being made of a resiliently deformable material or being urged in a closed position by a spring · CPC title

• B05B11/1016

  the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element (B05B11/1022, B05B11/1023 take precedence) · CPC title

• B05B11/1011

  without substantial movement of the nozzle in the direction of the pressure stroke · CPC title

• B05B11/104

  the outlet valve being opened by pressure after a defined accumulation stroke · CPC title

• F04B7/0266

  the inlet and discharge means being separate members · CPC title