Pressure-driven metered mixing dispensing pumps and methods
First Claim
1. A pressure-driven metered mixing dispensing pump, comprising:
- a housing;
a fluid inlet;
a piston disposed in the housing at least partially defining first, second and third chambers within the housing, the first and second chambers each in fluid communication with the third chamber, the piston configured to, in response to first fluid entering the first chamber via the fluid inlet, move in a first direction to decrease the volume of the second chamber thereby ejecting second fluid, different from the first fluid, from the second chamber into the third chamber;
a spring to move the piston in a second direction to decrease the volume of the first chamber thereby ejecting at least some of the first fluid from the first chamber into the third chamber thereby mixing the at least some of the first fluid and the second fluid to form a mixture in the third chamber; and
an outlet to discharge the mixture from the third chamber.
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Accused Products
Abstract
An example pressure-driven metered mixing dispensing pump includes a housing, a fluid inlet, a piston disposed in the housing at least partially defining first, second and third chambers, the first and second chambers each in fluid communication with the third chamber, the piston to, in response to first fluid entering the first chamber via the fluid inlet, move in a first direction to decrease the volume of the second chamber thereby ejecting second fluid from the second chamber into the third chamber, a spring to move the piston in a second direction to decrease the volume of the first chamber thereby ejecting at least some of the first fluid from the first chamber into the third chamber thereby mixing the at least some of the first fluid and the second fluid to form a mixture, and an outlet to discharge the mixture from the third chamber.
19 Citations
20 Claims
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1. A pressure-driven metered mixing dispensing pump, comprising:
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a housing; a fluid inlet; a piston disposed in the housing at least partially defining first, second and third chambers within the housing, the first and second chambers each in fluid communication with the third chamber, the piston configured to, in response to first fluid entering the first chamber via the fluid inlet, move in a first direction to decrease the volume of the second chamber thereby ejecting second fluid, different from the first fluid, from the second chamber into the third chamber; a spring to move the piston in a second direction to decrease the volume of the first chamber thereby ejecting at least some of the first fluid from the first chamber into the third chamber thereby mixing the at least some of the first fluid and the second fluid to form a mixture in the third chamber; and an outlet to discharge the mixture from the third chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a pressure-driven metered mixing dispensing pump having first, second and third chambers at least partially defined by a piston, the method comprising:
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supplying first fluid into the first chamber to eject second fluid, different from the first fluid, from the second chamber into the third chamber when the piston is moved in a first direction; ejecting at least some of the first fluid from the first chamber into the third chamber to form a mixture of the first and second fluids when the piston is moved in a second direction; and ejecting the mixture from the third chamber, and further comprising siphoning an additional amount of the second fluid into the second chamber as the at least some of the first fluid is ejected from the first chamber into the third chamber. - View Dependent Claims (18, 19)
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20. A method of operating a pressure-driven metered mixing dispensing pump having first, second and third chambers at least partially defined by a housing and a piston, the method comprising:
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supplying first fluid into the first chamber to eject second fluid, different from the first fluid, from the second chamber into the third chamber; ejecting at least some of the first fluid from the first chamber into the third chamber to form a mixture of the first and second fluids; ejecting the mixture from the third chamber; and further comprising siphoning an additional amount of the second fluid into the second chamber as the at least some of the first fluid is ejected from the first chamber into the third chamber.
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Specification