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Publication numberUS3575535 A
Publication typeGrant
Publication dateApr 20, 1971
Filing dateApr 21, 1969
Priority dateApr 21, 1969
Publication numberUS 3575535 A, US 3575535A, US-A-3575535, US3575535 A, US3575535A
InventorsBickar Frederick H
Original AssigneeBickar Frederick H
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Additive proportioning, positive displacement, pumplike device
US 3575535 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

United States Patent Frederick H. Bickar 2517 besserman St, Torrance, Calif. 90503 817,91 1

Apr. 21, 1969 Apr. 20, 1971 [72] Inventor [21 Appl. No. [22] Filed [45 Patented [54] ADDITIVE PROPORTIONING, POSITIVE DISPLACEMENT, PUMPLIKE DEVICE 12 Claims, 4 Drawing Figs.

[52] US. Cl 1. 417/244, 137/99, 417/348, 417/377 [51] Int. Cl ..F04b 25/00, F04b 17/00, F04b 35/00 [50] Field of Search 103/5, 7, 2,

I26, 126 (B), 126 (i0), 126 (TO), 126(5); 230/141,l43,205;123/l2;91/87;417/244, 348,

Primary ExaminerCarlton R. Croyle Assistant Examiner-Wilbur .l Goodlin Attorney-Mahoney, Hornbaker and Schick ABSTRACT: A pair of multivaned impellers are rotatably mounted interengaged longitudinally. intermediate an inlet and outlet of a main fluid chamber, the impellers during rotation passing fluid in a bifurcated flow path between said vanes transversely outwardly along said impellers and longitudinally along transversely spaced sides of said main fluid chamber. An additive fluid chamber is also formed by the housing spaced from the main fluid chamber, said additive fluid chamber having similarly mounted impellers therein which are axially aligned with the impellers of the main fluid chamber and secured rotatable by said main fluid chamber impellers. The outlet of the additive fluid chamber is connected in fluid communication with a diffuser in the main fluid chamber, said diffuser being positioned midway of said impellers in the main fluid chamber extending axially elongated therealong at the chamber inlet side thereof. Furthermore, the diffuser has outlets transversely midway thereof directed toward the impellers and oppositely generally transversely extending arcuate surfaces closely adjacent each of said impellers extending transversely at least equal to the circumferential spacing of the vanes on the impellers. The chamber inlet side of the diffuser is preferably formed with arcuate surfaces similar to the before-mentioned arcuate surfaces but projecting arcuately in reverse fashion directing fluid from said chamber inlet in said bifurcated flow path. Finally, a diffuser may be similarly positioned in the additive fluid chamber preferably being formed of similar exterior shape, and the impellers of the additive fluid chamber are formed for passing fluid through said chamber of a determined proportionate volume less than the fluid passed through said main fluid chamber by the impellersthereof. Thus, additive fluid through the additive fluid chamber will be metered into the main fluid chamber for mixing with the main fluid flow in determined and exact proportion.

ADDHTIIVIE PROPORTIONHNG, IPOSITIIVE DISPLACIEIVWNT, FIUMPLIKE DEVICE BACKGROUND OF THE INVENTION This invention relates to an additive proportioning, positive displacement, pumplike device wherein additive fluid is metered by the device into a main fluid flow stream passing therethrough in a predetermined and constant proportion. More particularly, this invention relates to a device of the foregoing general character wherein proper proportionate mixing of the additive fluid into the main fluid stream is maintained despite any possible variations in main stream fluid flow, the additive fluid flow always being directly regulated with the main fluid flow due to the unique construction of the device. As a result, exactly proportioned fluid mixtures may be obtained on longterm fluid flow basis and premixing of the fluids is not required.

An example of a prime use of the device of the present invention is for the proportionate mixing of liquid additives in a main flow stream of water for use in extinguishing gasoline fires and the like. A relatively recently developed liquid additive has been effectively used mixed with a main stream of water which, when directed over a gasoline fire, forms an oxygen-impervious film over the burning gasoline, thereby extinguishing the same. Prior to the present invention, two methods have been used for intermixing the liquid additive with the water in order that the liquid mixture may be directed over and extinguish the gasoline fires, both methods presenting certain inherent difi'rculties.

The most obvious method, of course, for intermixing the liquid additive and water is to permix the same in a container and make use of pumping devices for removing the mixture from the container, or using smaller portable devices which can be carried to the fire site containing the mixture for direction on the fire. Clearly, if the additive liquid and water are required to be premixed in separate containers, the available quantity thereof is limited and a premixed supply must always be maintained. Thus, although this premixing method might be satisfactory where only small quantities are required for the relatively minor gasoline fires, such method is impossible of use for fighting major fires of large magnitude.

As a result of the inherent limitations of the premixing method, a method of continuously mixing of the additive liquid with a continuous water stream has been used of a form involving the well-known venturi principle, that is, in brief terms, use of the mainstream water flow past an orifice to create a low-pressure area causing the interrnixing flow of the additive liquid into the mainstream water flow. Although this venturi method does provide continuous intermixing of the additive liquid and water, it is extremely difficult therewith to control the liquid proportions of mixing, and becomes even more difiicult of control when the volume of liquid additive is only a relatively small proportion of the volume of water flow. For instance, in the example of use cited, the liquid additive provides maximum efficiency and effectiveness when mixed with the water in the proportion of one part liquid additive to or 16 parts of water and using this venturi-type method of continuous intermixing even with slight variations in water flow, there are many instances of an insufficient quantity of liquid additive and many instances of an excess and wasting of liquid additive.

OBJECTS AND SUMMARY OF THE INVENTION it is, therefore, an object of this invention to provide an additive proportioning, positive displacement, pumplike device wherein an exact proportionate and continuous intermixing of additive fluid with a main fluid flow is obtained so that the exact desired concentration of additive in the final main fluid flow is always assured. Thus, with the device of the present invention, variations in main fluid flow will not affect the proportionate mixing of additive fluid therewith so as to maintain the effectiveness of the mixture at a maximum without additive wasting through the use of excess quantities thereof. As a result, the device of the present invention is well adapted for use in the continuous proportionate mixing of liquid additives to a mainstream water flow in the combating and extinguishing of special forms of fires, such as gasoline fires and the like.

It is a further object of this invention to provide an additive proportioning, positive displacement, pumplike device of the foregoing general character making use of interengaged, positive displacement impellers for passing the main stream of fluid through a housing chamber, the metering into this main stream of the additive fluid being directed at and carried into the main fluid stream by such impellers so as to insure proper metering, as well as proper disbursement of the additive into the main fluid stream in the exact proportions desired.

Furthermore, it is preferred to provide the supply of additive fluid passing through a supplementary additive fluid chamber having similar interengaged, positive displacement impellers which are moved at a speed regulated directly by the impellers of the main fluid chamber so that the additive fluid flow will be regulated directly by the main fluid flow requiring the predetermined proportioning to be maintained despite variations in .the main fluid flow. Still further, with this arrangement of interconnected, main fluid impellers and additive fluid impellers always assuring the proper fluid proportioning, the main fluid impellers may be driven directly by the pressure and flow of the main fluid stream to, in turn, directly drive the additive fluid impellers and eliminate'the necessity of any outside driving means for the device.

It is still a further object of this invention to provide an additive proportioning, positive displacement, pumplike device having the foregoing adaptability and, attributes wherein an improved form and location of diffuser means may be provided in the main fluid chamber directly preceding the main fluid impellers for metering the additive fluid flow into the main fluid flow such that certain inherent characteristics of the positive displacement impellers of the main fluid chamber are used to maintain proper additive metering and interspersing. The additive fluid diffuser in the main fluid chamber is positioned midway of the interengaged impellers and has outlet means directed toward the impellers at this midway location. This diffuser also has certain arcuate surfaces thereupon adjacent the additive fluid inlet and particularly formed relative to and closely adjacent to the impeller vanes functioning to take advantage of the lowpressure area inherently developed by the interengaged impellers for permitting the metered entrance of the additive fluid and transportation thereof by the impellers into and interspersed in the main fluid flow.

Other objects and advantages of the invention will be apparent from the following specification and the accompanying drawing which is for the purpose of illustration only.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a longitudinal, vertical sectional view of an embodiment of an additive proportioning device incorporating the principles of the present invention;

HO. 2 is a reduced, horizontal sectional view looking in the direction of the arrows 2 2 in FIG. 1;

FIG. 3 is a reduced, fragmentary, horizontal sectional view looking in the direction of the arrows 3-3 in FIG. 1; and

FIG. 4 is a reduced, transverse, vertical sectional view looking in the direction of the arrows 4-4 in FIG. 1.

DESCRIPTION OF THE BEST EMBODIMENT CONTEMPLATED An embodiment of the additive proportioning, positive displacement, pumplike device incorporating the principles of the present invention is shown in FIGS. 1 through d and includes a housing generally indicated at 10 forming a main fluid chamber generally indicated at 12 having a main fluid inlet 14 longitudinally spaced from a main fluid outlet 16. A pair of interengaged, multivaned impellers 18 are rotatably mounted in the main fluid chamber 12 by axial shaftlikc hubs 20 in somewhat usual manner. The impellers 18 have an equal number of radially projecting and axially extending vanes 22 and with said impellers being of the positive displacement form, the vanes 22 being fully interengaged radially, transversely between said impellers and the circumferential spacing between said vanes being equal.

At the same time the rotatable movement of the impeller vanes 22 transversely outwardly of the respective impellers 18 is closely adjacent transversely spaced housing sides 24 forming the transverse sides of the main fluid chamber 12, said housing sides being formed arcuately in their longitudinal extension to partially conform to the outer extremities of the impeller vanes. Thus, a main fluid stream entering the main fluid chamber 12 through the inlet 14 is passed longitudinally in a bifurcated flow path transversely outwardly along the impellers 18 in the spaces circumferentially between the vanes 22 thereof and along the housing sides 24 ultimately to and outwardly through the outlet 16 of the main fluid chamber. Furthermore, reverse longitudinal flow of the main fluid stream between the impellers 18 from the sides thereof toward the main fluid outlet 16 is prevented by the full interengagement of the impeller vanes 22 between said impellers, thereby tending to create a low-pressure area midway of said impellers at the sides thereof toward the main fluid inlet 14.

An additive diffuser 26 is positioned transversely midway of the impellers 18 at the sides thereof toward the main fluid inlet 14 and closely adjacent the radial extremities of the impeller vanes 22, preferably extending the full axial lengths of the impellers. Preferably substantially exactly transversely midway of the impellers 18, the additive diffuser 26 is formed with a series of outlet openings 28 opening outwardly longitudinally toward the impeller vanes 22 and communicating inwardly of the diffuser with a diffuser passage 30 extending the axial length of the diffuser relative to the impellers 18. The diffuser 26 is also formed throughout the axial length thereof with oppositely transversely extending, arcuate surfaces 32 positioned closely adjacent the extremities of the impeller vanes 22 and conforming to the circular paths of movement of the outer extremities of the impeller vanes 22.

Each of the diffuser arcuate surfaces 32 extends transversely from transversely midway of the diffuser 26 and the outlet openings 28 thereof preferably a distance at least equal to the circumferential spacing between the impeller vanes 22 so that these diffuser arcuate surfaces increase the effect of the inherent low-pressure area normally generated at this location of the main fluid chamber 12 adjacent the leaving of interengagement of the oppositely rotating impeller vanes 22. Thus, additive fluid may be metered from the additive diffuser 26 through the diffuser outlet openings 28 into the spaces between the diffuser vanes 22 as these vanes leave their interengagement and such additive fluid will be carried between the diffuser blades along the diffuser arcuate surfaces 32 and oppositely transversely into the bifurcated path of flow of the main fluid stream passing longitudinally through the main fluid chamber 12 transversely outwardly along the impellers 18. It is also preferred to form similar, but oppositely longitudinally facing, generally transversely extending arcuate surfaces 34 on the additive diffuser 26 for aiding in directing the main fluid flow entering the main fluid chamber 12 in its bifurcated path of flow.

The housing 10 further forms an additive fluid chamber generally indicated at 36 spaced from the main fluid chamber 12 having an additive fluid inlet 38 and an additive fluid outlet 40 spaced longitudinally therefrom. A similar pair of multivrtned, interengaged impellers 42 are rotatably mounted in the additive fluid chamber 36 longitudinally between the inlet 38 and outlet 40 thereof, said impellers 42 preferably being axially aligned with and secured through shaftlike hubs 43 directly to the impellers 18 of the main fluid chamber 12 for being rotatably driven by said main fluid chamber impellers. The interengaged, oppositely rotating impellers 42 of the additive fluid chamber 36 are mounted relative to each other and relative to arcuate and transversely spaced housing sides 44 in the same manner as described relative to the impellers 18 of the main fluid chamber 12, the prime difference being that vanes 46 of the impellers 42, although preferably equal in number to the impeller vanes 22 of the main fluid chamber 12, are of different size so that the spaces circumferentially therebetween are of different size as will be hereinafter discussed.

A diffuser 48 is mounted in the additive fluid chamber 36 in the same location and of the same general configuration as the additive diffuser 26 of the main fluid chamber 12, except that this diffuser 48 in the additive fluid chamber does not include any passages therethrough for any fluid flow. Thus, the diffuser 48 is transversely midway of the impellers 42 in the additive fluid chamber 36 and oppositely transversely extending, arcuate surfaces 50 thereof aid in directing an additive fluid stream entering the additive fluid chamber 36 through the inlet 38 in a bifurcated flow path transversely outwardly along the housing sides 44 between the impeller vanes 46 longitudinally to the additive fluid outlet 40. The additive fluid outlet 40 is connected in fluid communication through a passage 52 with an inlet 54 of the main fluid chamber diffuser 26 at an end thereof as best shown in FIG. 1.

Returning to a consideration of the relative sizes of the spaces between the impeller vanes 22 of the main fluid chamber impellers 18 and the impeller vanes 46 of the additive fluid chamber impellers 42, as shown by comparison of FIGS. 2 and 3, and also taking into account the axial extents of the main fluid chamber impellers and the additive fluid chamber impellers, as clearly shown in F108. 1 and 4, the proportioning between the main fluid being passed through the main fluid chamber 12 by the impellers 18 and the additive fluid being metered into said main fluid flow which is passed through the additive fluid chamber 36 by the impellers 42 will be determined by the relative volumes between the vanes 22 of the main fluid chamber impellers and the vanes 46 of the additive fluid chamber impellers, since, in this case, the respective impellers have the same numbers of vanes and are rotatably secured together for simultaneous rotation. ln the particular embodiment illustrated, the relative vanes spacing volumes are in a proportion of about 15 to one, that is, 15 parts of main fluid to one part of additive fluid, which would be suitable for the previously discussed additive liquid for mixing with a main flow water stream usable in combating gasoline fires and the like. lt is obvious to one skilled in the art that the sizes of the various impellers could be altered and that the impellers rotational speeds could be altered, even varying between the impellers 18 of the main fluid chamber 12 and the impellers 42 of the additive fluid chamber 36, the important thing being that according to the broader principles of the present invention, the volume of main fluid passed through the main fluid chamber by the positive displacement impellers thereof will be in a predetermined proportion to the additive fluid passed through the additive fluid chamber by the positive displacement impellers thereof requiring an exactly proportioned intermixing for the ultimate fluid stream leaving the main fluid chamber.

In operation, main fluid under pressure flowing into the main fluid chamber 12 through the inlet 14 will flow in the bifurcated path transversely outwardly along the main fluid chamber impellers l8 oppositely rotating these impellers and ultimately longitudinally through the main fluid chamber to the outlet 16. The rotation of the main fluid chamber impellers 18 will cause simultaneous rotation of the additive fluid chamber impellers 42 causing a metered flow of additive fluid through the additive fluid chamber 36, the passage 52, the additive diffuser 26 and from the additive diffuser outlet openings 28 into the circumferential spaces between the vanes 22 of the main fluid chamber impellers 18. Such additive fluid entering the main fluid chamber 12 will be carried transversely outwardly by the main fluid chamber impellers l8 and interspersed in the previously determined exact proportion into the main fluid, being carried therewith longitudinally through the main fluid chamber l2 and outwardly through the outlet lb thereof.

Thus, according to the principles of the present invention,- an additive proportioning, positive displacement, purnplike device is provided which will exactly meter and intersperse additive fluid in a determined proportion into a main fluid flow stream. Furthermore, since in the preferred form, the main fluid flow determines and regulates the exact flow of the additive fluid, the determined exact proportioning will always be maintained, despite any variations in main fluid flow. Even further, a unique form of metering and interspersing of the additive fluid into the main fluid is established by the additive fluid diffuser directing the additive fluid into the main fluid.

lclaim:

l. in an additive proportioning, positive displacement, pumplilte device; the combination of: a pair of multivaned, radially and rotatably interengaged main impellers mounted in a housing longitudinally intermediate a main fluid inlet and a main fluid outlet of a main fluid chamber of said housing, said main impeller vanes rotatably moving adjacent housing opposite transversely spaced sides of said main fluid chamber passing fluid in a bifurcated path of flow from said main fluid 3. An additive proportioning device as defined in claim I in which each of said additive impellers in said additive fluid chamber is axially aligned with a main impeller of said main fluid chamber and is secured rotatable by and therewith, said additive impellers of said additive fluid chamber having equally circumferentially spaced additive impeller vanes equal in number to equally circumferentially spaced main impeller vanes of said main impellers in said main fluid chamber.

4. An additive proportioning device as defined in claim 1 in which each of said additive impellers in said additive fluid chamber is axially aligned with a main impeller of said main fluid chamber and is secured rotatable by and therewith, said additive impellers of said additive fluid chamber having equally circumferentially spaced additive impeller vanes equal in number to equally circumferentially spaced main impeller vanes of said main impellers in said main fluid chamber, the volumes of the circumferential spaces between said additive i impeller vanes of said additive impellers in said additive fluid inlet longitudinally along said housing sides to said main fluid outlet, said main impeller vane, interengagement substantially preventing-reverse longitudinal fluid flow between said main impellers; said main fluid inlet including means for connecting said main fluid inlet to a main pressurized fluid flow and directing said main fluid into said main fluid chamber against said main impeller vanes rotatably driving said main impellers during main impeller passing of said main fluid in "said bifurcated path of flow from said main fluid V inlet longitudinally along said housing sides to and from said main fluid outlet; said main impellers being free of rotatable driving other than by said main fluidflow from said'rnain fluld'inlet; additive diffuser means adjacent said main impellers at side's thereof longitudinally toward said main fluid inlet of said main fluid chamber for directing an additive fluid substantially equally between said main impeller vanes of each of said main impellers upon said main impeller vanes rotatably leaving said interengagement and moving toward said housing sides to mix said additive fluid with said driving main fluid flow from said chamber being a determined proportionate amount less than those of said main impellers in said main fluid chamber.

5. in an additive proportioning, positive displacement, pumplike device, the combination of: a housing having a main fluid chamber with generally longitudinally spaced main fluid inlet-and main fluid outlet; at least two multivaned, radially interengaged, rotatable main impellers in said main fluid chamber between said main fluid inlet and main fluid outlet,

1 'said main impellers being oppositely rotatable with said vanes main fluid inlet of said main fluid chamber; a secdnd pair of multivaned, radially and rotatably interengaged impellers mounted in said housing in an additive fluid chamber spaced from said main fluid chamber longitudinally intermediate an additive fluid inlet and an additive fluid outlet of said additive fluid chamber, said additive impeller vanes of said additive impellers in said additive fluid chamber rotatably moving adjacent housing transversely spaced sides of said additive fluid chamber passing an additive impeller regulated supply of additive fluid in a bifurcated path of flow flom said additive fluid inlet longitudinally along "said housing sides to said additive fluid outlet, said additive fluid outlet being operabiy connected in communication with said main fluid chamber diffuser means supplying said additive fluid to said main fluid chamber diffuser means; and means operably connecting said additive impellers of said additive fluid chamber robly driven solely by said main impellers of said main fluid chamber.

2. An additive proportioning device as defined in claim l in which said multi vaned additive impellers in said additive fluid chamber are constructed and arranged relative to said main impellers in said main fluid chamber passing an additive impeller regulated determined proportion less additive fluid through said additive fluid chamber and to said niain' fluid thereof moving rotatably at outer transverse sides thereof closely adjacent opposite sides of said main fluid chamber formed by said housing generally longitudinally toward said main fluid chamber outlet passing a main fluid flow from said main fluid chamber inlet in bifurcated flow fashion between said main impeller vanes at said main impeller outer sides generally longitudinally along said main fluid chamber opposite sides and toward said main fluid chamber outlet, said interengagement of said main impeller vanes substantially preventing a reverse longitudinal passage of fluid transversely between said main impellers; and an additive diffuser substantially transversely midway of said interengaged main impellers and directly longitudinally adjacent sides of said main impellers toward said main fluid chamber inlet, said additive diffuser having an additive inlet communicable with a supply flow of additive fluid and an additive outlet directed generally midway toward said main impellers and against said main impeller vanes immediately as said main impeller vanes leave said interengagement to direct said additive fluid flow between said main impeller vanes of each of said main impellers upon said main impeller vanes leaving said interengagement thereof and mix between said main impeller varies with said main fluid flow being passed by said main which said additive diffuser is axially elongated relative to axes impeller vanes.

ti. An additive proportioning device as defined in claim 5 in 1 transversely from transversely midway of said additive diffuser chamber diffuser means than is passed through said main fluid and closely radially adjacent said main impeller vanes, each of said additive diffuser arcuate surfaces extending circumferentially if its respective main impeller a circumferential distance at least equal to the circumferential spacing between circumferentially adjacent main impeller vanes of said main impeller.

9. An additive proportioning device as defined in claim in which said additive diffuser is axially elongated relative to axes of said main impellers having said additive outlet substantially transversely midway of said additive diffuser; in which said main impeller vanes of each of said main impellers are generally radially extending and equally circumferentially spaced; and in which said additive diffuser is formed with transversely arcuate surfaces extending oppositely transversely from transversely midway of said additive diffuser and closely radially adjacent said main impeller vanes, each of said additive diffuser arcuate surfaces extending circumferentially of its respective main impeller a circumferential distance at least equal to the circumferential spacing between circumferentially adjacent main impeller vanes of said main impeller.

10. An additive proportioning device as defined in claim 5 in which said additive diffuser is axially elongated relative to axes of said main impellers having said. additive outlet substantially transversely midway of said additive diffuser; in which said main impeller vanes of each of said main impellers are generally radially extending and equally circumferentially spaced; and in which said additive diffuser is fonned with transversely arcuate surfaces extending oppositely transversely from transvemely midway of said additive diffuser and closely radially adjacent said main impeller vanes, each of said additive diffuser arcuate surfaces extending circumferentially of its respective main impeller a circumferential distance at least equal to the circumferential spacing between circumferentially adjacent main impeller vanes of said main impeller, oppositely transversely arcuate extending surfaces on said additive diffuser generally longitudinally toward and generally longitudinally opposed to said main fluid chamber inlet extending from transversely midway of said additive diffuser.

11. An additive proportioning device as defined in claim 5 in which at least two multivanes, radially interengaged. rotatable additive impellers are mounted in an additive fluid chamber of said housing spaced from said main fluid chamber of said housing, said additive impellers of said additive fluid chamber being spaced longitudinally between an additive chamber inlet and additive chamber outlet of said additive fluid chamber, said additive chamber inlet eing communicable with said additive fluid supply flow, said additive impellers of said additive fluid chamber being oppositely rotatable with said additive impeller vanes thereof moving rotatably at outer transverse sides thereof closely adjacent opposite sides of said additive fluid chamber formed by said housing generally longitudinally toward said additive fluid chamber outlet passing said additive fluid supply flow from said additive fluid chamber inlet in bifurcated flow fashion between said additive impeller vanes at said additive impeller outer sides and toward said additive fluid chamber outlet, means operably connecting said additive fluid chamber outlet in fluid communication with said additive inlet of said additive diffuser in said main fluid chamber; in which said main fluid inlet of said main fluid chamber includes means for connecting said main fluid inlet to said main fluid flow and said main fluid flow is a main pressurized fluid flow, said main fluid inlet directing said main fluid into said main fluid chamber against said main impeller vanes rotatably driving said main impellers during main impeller passing of said main ,fluid in said bifurcated path of flow from said main fluid inlet to and from said main fluid outlet, said main impellers being free of driving other than by said main fluid flow from said main fluid inlet; and in which there is means operably connecting said additive impellers of said additive fluid chamber for rotatably driving said additive impellers solely by said main impellers of said main fluid chamber.

12. An additive proportioning device as defined in claim 11 in which said additive diffuser is axially elongated relative to axes of said main impellers having said additive outlet substantially transversely midway of said additive diffuser; in

which said main impeller vanes of each of said main impellers are generally radial y extending and equally circumferentially spaced; in which said additive diffuser is formed with transversely arcuate surfaces extending oppositely transversely from transversely midway of said additive diffuser and closely radially adjacent said main impeller vanes, each of said additive diffuser arcuate surfaces extending circumferentially of its respective main impeller a circumferential distance at least equal to the circumferential spacing between circumferentially adjacent main impeller vanes of said main impeller, oppositely transversely arcuate extending surfaces on said additive diffuser generally longitudinally toward and generally longitudinally opposed to said main fluid chamber inlet extending from transversely midway of said additive diffuser; and in which a diffuser is in said additive fluid chamber longitudinally adjacent and substantially midway of said additive impellers of said additive fluid chamber between said additive impellers and said additive fluid chamber inlet, said additive fluid chamber diffuser of said additive fluid chamber having oppositely generally transversely extending arcuate surfaces formed from midway of said additive fluid chamber diffuser and generally longitudinally facing said additive fluid chamber inlet.

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Classifications
U.S. Classification417/244, 137/99, 417/377, 417/348
International ClassificationF04C11/00, F04C2/12, F04C13/00, A62C25/00, F04C2/00
Cooperative ClassificationF04C13/00, F04C11/001, F04C2/123, A62C25/005
European ClassificationF04C13/00, A62C25/00B, F04C11/00B, F04C2/12B