Buffered pump system

Patent metadata

Field	Value
Publication number	US-11519394-B2
Application number	US-201916451394-A
Country	US
Kind code	B2
Filing date	Jun 25, 2019
Priority date	Jun 25, 2019
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

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 said inlet one-way valve;
a piston slideably engaged with said pump chamber;
a piston cavity within said piston and in fluid communication with said pump chamber;
a liquid accumulator operable within said piston cavity and accumulating liquid with increasing pressure and discharging liquid with decreasing pressure, wherein said liquid accumulator is a bladder accumulator, wherein said liquid accumulator is in fluid communication with said pump chamber during a downstroke of said piston;
an actuator engaged with said piston;
and an outlet one-way valve downstream of and in fluid communication with said pump chamber;
wherein:
said piston cavity is defined by a piston cavity opening oriented towards said pump chamber and a piston cavity closed end oriented towards said actuator and a piston cavity peripheral wall extending from said piston cavity closed end to said piston cavity opening,
the pump chamber has an upstroke pump chamber volume and the piston cavity has a piston cavity volume that is from about 0.2 to about 0.8 of the upstroke pump chamber volume, and
the upstroke pump chamber volume is measured between the inlet one-way valve and the outlet one-way valve with the piston located at its upstroke position.

2. The pump according to claim 1 , wherein said pump chamber further comprises a piston bore and said piston is slideably engaged with said piston bore.

3. The pump according to claim 2 , wherein said piston cavity peripheral wall is slideably engaged with said pump chamber.

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

5. The pump according to claim 4 , wherein said actuator is a trigger.

6. The pump according to claim 5 , wherein said piston cavity peripheral wall is slideably engaged with said pump chamber.

7. The pump according to claim 6 , wherein said resilient member is outside of said pump chamber.

8. The pump according to claim 7 , wherein said outlet one-way valve is a precompression valve.

9. The pump according to claim 1 , wherein said actuator is a trigger.

10. The pump according to claim 1 , wherein said pump further comprises a dip tube upstream of said inlet one-way valve.

11. The pump according to claim 1 , wherein said bladder accumulator is positioned entirely within said piston cavity.

12. A pump comprising:
an inlet one-way valve;
a pump chamber downstream of and in fluid communication with said inlet one-way valve;
a piston slideably engaged with said pump chamber;
a piston cavity within said piston and in fluid communication with said pump chamber;
a liquid accumulator operable within said piston cavity, wherein said liquid accumulator is a diaphragm accumulator, wherein said liquid accumulator is in fluid communication with said pump chamber during a downstroke of said piston;
an actuator engaged with said piston;
and an outlet one-way valve downstream of and in fluid communication with said pump chamber;
wherein:
said piston cavity is defined by a piston cavity opening oriented towards said pump chamber and a piston cavity closed end oriented towards said actuator and a piston cavity peripheral wall extending from said piston cavity closed end to said piston cavity opening,
the pump chamber has an upstroke pump chamber volume and the piston cavity has a piston cavity volume that is from about 0.2 to about 0.8 of the upstroke pump chamber volume, and
the upstroke pump chamber volume is measured between the inlet one-way valve and the outlet one-way valve with the piston located at its upstroke position.

13. The pump according to claim 12 , wherein said pump chamber further comprises a piston bore and said piston is slideably engaged with said piston bore.

14. The pump according to claim 13 , wherein said piston cavity peripheral wall is slideably engaged with said pump chamber.

15. The pump according to claim 12 , wherein said pump further comprises a resilient member engaged with said actuator; wherein said pump chamber has a pump chamber volume that is a function of position of said piston; and wherein said resilient member is biased to expand said pump chamber volume.

16. The pump according to claim 15 , wherein said resilient member is outside of said pump chamber.

17. The pump according to claim 16 , wherein said outlet one-way valve is a precompression valve.

Assignees

• Procter & Gamble

Inventors

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

Classifications

• B05B11/1038 Primary

  Pressure accumulation pumps, i.e. pumps comprising a pressure accumulation chamber · CPC title

• B05B11/104

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

• B05B11/1069

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

• B05B11/1011

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