Two-stage jet pump proportioner

Claim 2

In a mixture dispensing device having a housing defining a mixing compartment; normally open valve means for conducting solvent to said compartment above a comparatively low positive gauge pressure including a vent valve and flow control valve closed by solvent present having a pressure above said low positive gauge pressure; manual means for actuating the solvent valve means above said low pressure and the solute valve means simultaneously therewith; and, jet pump mixing means in said compartment inducing said lower pressure by confluent flow of said solvent and solute for mixing said solvent and solute in a solution of predetermined portions.

Claim 3

The device defined in claim 1 including means for inducing said lower pressure by flow of said solvent mixing with and acting upon solute supplied through said solute valve means.

Claim 4

The device defined in claim 2 in which said jet pump mixing means comprises: means conducting solvent at high pressure through converging walls and ejecting it as a column through a gap into a throat having a size greater than that of the column, and said solute valve means having its outlet connected to supply solute to said gap; and back flow check valve means between said solvent valve means and said solute valve means for maintaining solvent and solute prime of said gap.

Claim 5

The device defined in claim 2 including a nozzle having a flow area substantially less than the water flow area ahead of the jet pump means.

Claim 6

The device defined in claim 1 including a jet mixing pump in said mixing chamber establishing by operation of the positive gauge pressure upon the solvent valve a negative gauge pressure upon the solute valve.

Claim 7

A jet pump mixing and dispensing unit comprising: a housing defining a compartment, means received in said compartment having a first section defining two spaced passages with converging walls of different lengths defining nozzles each terminating in a port, one passage defining a long nozzle extending through the section and terminating in one port, the other passage defining a short nozzle terminating in another port at a mixing chamber that is laterally open to the outside of said housing to receive solute under approximately zero gauge pressure, said other passage extending beyond the mixing chamber and terminating in a passage portion having diverging walls coaxial with the other port and ending in an outlet; and means in said compartment defining a second section coacting with said first section to define a second mixing chamber interconnecting the one port and opening at the downstream end of said second section.

Claim 8

A jet pump mixing and dispensing unit comprising: a housing defining a compartment, means received in said compartment having a first section defining two spaced passages with converging walls of different lengths defining nozzles each terminating in a port, one passage defining a long nozzle extending through the section and terminating in one port, the other passage defining a short nozzle terminating in another port at a mixing chamber that is laterally open to the outside of said housing to receive solute under approximately zero gauge pressure, said other passage extending beyond the mixing chamber and terminating in a passage portion having diverging walls coaxial with the other port and ending in an outlet; and means in said compartment defining a second section coacting with said first section to define a second mixing chamber interconnecting the one port and opening at the downstream end of said second section.

Claim 9

The jet pump unit defined in claim 6 in which: said first section is stationary; and, said second section is a removable insert.

Claim 10

The jet pump unit called for in claim 6 in which said discharge conduit has diverging walls.

Claim 11

A solution proportioning, mixing and dispensing device comprising: a plurality of liquid flow jet pump means, each comprising a conically converging side wall terminating in a jet nozzle port to convert solvent under pressure to jet flow energy at approximately zero gauge pressure jetting into respective mixing stage chambers filled with solute at approximately the same pressures; and a pump chamber for one of the nozzles having an inlet opening of a size larger than the jet port thereof disposed in axial alignment therewith with a terminal section of a conical diverging contour for converting flow energy to pressure flow, said nozzle and pump chamber being spaced to provide a gap defined by one of said mixing stage chambers supplied with a free flow of solute at approximately zero gauge pressure and said one pump chamber operating with free flow to the other mixing stage chamber; the ratio of the area sizes of the jet port to the inlet opening determining the proportioning ratio.

Claim 12

A solution proportioning, mixing and dispensing device comprising: a plurality of liquid flow jet pump means, each comprising a conically converging side wall terminating in a jet nozzle port to convert solvent under pressure to jet flow energy at approximately zero gauge pressure jetting into respective mixing stage chambers filled with solute at approximately the same pressures; and a pump chamber for one of the nozzles having an inlet opening of a size larger than the jet port thereof disposed in axial alignment therewith with a terminal section of a conical diverging contour for converting flow energy to pressure flow, said nozzle and pump chamber being spaced to provide a gap defined by one of said mixing stage chambers supplied with a free flow of solute at approximately zero gauge pressure and said one pump chamber operating with free flow to the other mixing stage chamber; the ratio of the area sizes of the jet port to the inlet opening determining the proportioning ratio.

Claim 13

The device defined in claim 9 in which said ratios of flow area sizes are substantially the same.

Claim 14

The device defined in claim 9 in which the pressure of the solvent and the solute in the second stage gap are substantially the same.

Claim 15

The device defined in claim 9 in which the ratio of area sizes of the jet inlet opening and mixture receiving port being less than 1 to 4.

Claim 16

A jet pump solute mixing unit comprising: a shell internally having a unitary partition means defining a first stage confluence chamber and an insert means forming with the partition means a second stage confluence chamber between them; said partition means defining spaced nozzles whose inlets are open to a common source of liquid solvent under pressure having conical converging side walls terminating in jet ports, one of the ports opening into the first stage mixing chamber and the other into the second stage confluence chamber; said partition means defining a primary mixing pump having an inlet port spaced from and disposed in coaxial alignment with said first stage jet port to define a first stage confluence gap therebetween in which solvent under flow energy entrains solute; said primary mixing pump defining conical side walls that diverge from said primary stage inlet port to entrain solute followed by diverging side walls to mix the solute and solvent and convert the flow energy of the mixture to pressure at a primary stage mixture outlet therefrom directly in communication with said second stage confluence chamber, said insert means defining a second stage mixing pump having an inlet port from said second stage confluence chamber disposed in coaxial alignment with said other jet port and defining diverging side walls following said inlet port to convert the flow energy of the mixture therein to pressure at the outlet therefrom; the relative sizes of said jet ports and pump chamber ports determining the ratios of solute and solvent at said gaps; aperture means through the wall of the shell for conducting solute to the primary gap; and means for conducting solvent to both of said converging nozzles.

Claim 17

A jet pump solute mixing unit comprising: a shell internally having a unitary partition means defining a first stage confluence chamber and an insert means forming with the partition means a second stage confluence chamber between them; said partition means defining spaced nozzles whose inlets are open to a common source of liquid solvent under pressure having conical converging side walls terminating in jet ports, one of the ports opening into the first stage mixing chamber and the other into the second stage confluence chamber; said partition means defining a primary mixing pump having an inlet port spaced from and disposed in coaxial alignment with said first stage jet port to define a first stage confluence gap therebetween in which solvent under flow energy entrains solute; said primary mixing pump defining conical side walls that diverge from said primary stage inlet port to entrain solute followed by diverging side walls to mix the solute and solvent and convert the flow energy of the mixture to pressure at a primary stage mixture outlet therefrom directly in communication with said second stage confluence chamber, said insert means defining a second stage mixing pump having an inlet port from said second stage confluence chamber disposed in coaxial alignment with said other jet port and defining diverging side walls following said inlet port to convert the flow energy of the mixture therein to pressure at the outlet therefrom; the relative sizes of said jet ports and pump chamber ports determining the ratios of solute and solvent at said gaps; aperture means through the wall of the shell for conducting solute to the primary gap; and means for conducting solvent to both of said converging nozzles.

Claim 18

The jet pump defined in claim 13 including a backflow check valve means upstream to the pressure conversion nozzles for maintaining the prime of said pumps.

Claim 19

The jet pump unit defined in claim 13 including a short cylindrical section between the inlet port and the diverging wall following it.

Claim 20

A jet pump unit comprising: a housing having a cross wall means intermediate its ends and defining a chamber at its outlet and; said cross wall having a first passage therethrough defined by converging walls as its upstream end terminating in a jet nozzle, and by diverging walls at the downstream end with an entrance port larger than said jet nozzle, and a solute supply passage opening laterally through the housing and defining an enlarged gap between said nozzle and entrance port; said cross wall having a second passage through the cross wall defined by converging walls terminating in a jet nozzle; an insert means received in said chamber downstream of said cross wall having a passage therethrough defined by diverging walls having an entrance port larger than the second jet nozzle and coaxial therewith; and, the facing walls of said cross wall and insert means defining between them a space forming a gap connecting said second jet nozzle in communication with said diverging walls.

Claim 21

A jet pump unit comprising: a housing having a cross wall means intermediate its ends and defining a chamber at its outlet and; said cross wall having a first passage therethrough defined by converging walls as its upstream end terminating in a jet nozzle, and by diverging walls at the downstream end with an entrance port larger than said jet nozzle, and a solute supply passage opening laterally through the housing and defining an enlarged gap between said nozzle and entrance port; said cross wall having a second passage through the cross wall defined by converging walls terminating in a jet nozzle; an insert means received in said chamber downstream of said cross wall having a passage therethrough defined by diverging walls having an entrance port larger than the second jet nozzle and coaxial therewith; and, the facing walls of said cross wall and insert means defining between them a space forming a gap connecting said second jet nozzle in communication with said diverging walls.