US3655294A

US3655294A - Pump

Info

Publication number: US3655294A
Application number: US3757A
Authority: US
Inventors: Robert H Thatcher
Original assignee: Marine Systems Inc
Current assignee: Marine Systems Inc
Priority date: 1970-01-19
Filing date: 1970-01-19
Publication date: 1972-04-11
Anticipated expiration: 1989-04-11

Abstract

This invention is a fluid pump having an axially rotating duct which has an internal impeller blade therein disposed substantially axially. The pump has an inlet and outlet to couple the duct with a fluid medium functioning as the source and receiver of the fluid, and a powering means to axially rotate the duct to result in moving the fluid.

Description

United States atet Thatcher 51 Apr. 11., 1972 s41 PUMP 2,470,794 5/1949 Snyder ..415/72 2,605,606 8/1952 Pilz ..4l5/l22 [72] Inventor. Robert H. Thatcher, Wichita, Kans. 2,801,069 7/1957 Campbeum- 41 5 68 [73] Assignee: Marine Systems, Inc., Wichita, Kans. 3,083,893 4/1963 Dean ....415/68 [22] Filed: Jam 19 1970 3,330,214 7/1967 Donaldson ..4l5/71 [21] Appl- No 3,757 Primary Examiner-C. J. Husar Attorney-John H. Widdowson [52] U.S.C1 AIS/68 415/72 511 Int. Cl ..F0 1dl/24 1 1 ABSTRACT Field of Search "415/72, 71 This invention is a fluid pump having an axially rotating duct which has an internal impeller blade therein disposed substan- [56] References Cited tially axially. The pump has an inlet and outlet to couple the UNITED STATES PATENTS duct with a fluid medium functioning as the source and receiver of the fluid, and a powering means to axially rotate 622,4 4/1899 Hoskm the duct to result in moving the fluid, 3,531,214 9/1970 Abramson 950,5 64 3/1910 Bennett ..4l5/72 15 Claims, 16 Drawing Figures PATENTEDAPR 1 1 I972 SHEET 1 [1F 5 INVENTOR.

ROBERT H THATCHER ATTORNEY PATENTEDAPR 11 I972 3,655,294

sum 2 OF 5 n W I "1* W H III l I 1: H H l INVENTOR.

l ROBERT H. THATCHER I ATTORNEY PATENTEDAPR 11 1912 3,655,294

sum u or 5 "qr- ROBERT H. THATCHE R TORNEY PUMP Numerous types of pumps are known to the prior art, including those used for propulsion. However, these devices require some type of driving shaft or central hub arrangement to the impeller which disrupts the fluid flow normally preceding the impeller. Also, the prior art devices do not nonnally have an attached shrouded impeller and thus lose efficiency by pressure loss around the ends of the impeller blades. To produce pumping capability of the same order, prior art devices utilize impeller blades with higher rotational speeds, resulting in high jet velocities, which are very susceptible to cavitation and loss of mechanical efficiency.

In accordance with the preferred specific embodiments to be hereafter described the pump of this invention is provided that can be operably connected with a fluid medium by conduits. The pump can be operably installed to be powered by various configurations of powering devices. It can be arranged to function in a counter rotating tandem fashion with another similar unit or operate as a single unit. The pump is preferably operably installed with straight vanes in the inlet and outlet conduits to lessen the whirl component of the flow and increase efficiency. Also, it is preferably installed with suitable entry and diffuser to limit pressure losses due to fluid dynamlCS.

In accordance with a preferred specific embodiment of this invention, a pump is provided with an axially rotatable ducted impeller having internal blading and connected to the fluid medium by fixed inlet and outlet ducts. The bladed duct can be rotated by any of various powering devices as will be described hereinafter. The bladed duct of this preferred specific embodiment is internal cylindrical and has tapered and helically curved blades attached within the duct positioned obliquely to the central axis of the duct with curvilinear exposed edges. The impeller blades are preferably disposed at an angle between and 75 and more preferably between the range of 30 to 60. The blades can support a fluidically streamlined centerbody along the central axis of the duct.

In accordance with another preferred specific embodiment of this invention, a pump is provided generally similar to that, supra, except for the bladed duct. The internally cylindrical bladed duct of this embodiment has generally helically curved blades attached within the duct obliquely positioned relative to the ducts central axis similar to those described hereinbefore, and having smooth curvilinear unattached edges, but do not support a centerbody or have a form to do so.

In accordance with another preferred specific embodiment of this invention, a pump is provided generally similar to that supra, but having a differently bladed duct. The internally circular bladed duct of this preferred specific embodiment gas generally flat blades which are somewhat semicircular in shape themselves individually and have their curved edge attached to the inside of the duct to position the blades at opposite and oblique angles to the central axis of the duct. The impeller blades are preferably disposed at an angle in the range of 15 to 75 and more preferably between the range of 30 to 60, and blades at 45 have been found very satisfactory.

In accordance with another preferred specific embodiment of this invention, inclusive, with the referred specific embodiments set forth, supra, a pump is provided which is remotely powerable by a motor, engine, turbine, or the like as a powering device couplable to the rotatable bladed duct by a belt, chain or the like. The bladed duct is encircled by the belt, chain or like member and operably attached to the powering device.

In accordance with another preferred specific embodiment of this invention, consistent with those described, supra, a pump is provided which is powerable by a motor, engine, turbine or the like coupled directly with the rotatable duct by means of gears of a surface contact device. In this preferred specific embodiment, the bladed duct is provided attached on its outer surface with a gear or contacting surface which is coupled operably with a gear or contact surface of the motor, engine, turbine or the like.

in accordance with an additional preferred specific embodiment of this invention, consistent with those supra, a pump is provided which has the bladed duct member integral with the powering device. In this preferred specific embodiment, the bladed duct is placed coaxial with the motor, turbine or engine and located therein, so the powering device encircles and attaches to the bladed duct.

One object of this invention is to provide a pump which overcomes the aforementioned disadvantages of the prior art devices.

Another of this invention is to provide a new pump which will absorb a high level of power and is operable to transfer fluid at a relatively high flow rate without cavitation, for example, as in an irrigation water line.

Another object of this invention is to provide a new pump operable for water jet propelling water vehicles which does not limit the hull design.

Still another object of this invention is to provide a new pump which is adaptable to be powered by various methods.

Yet another object of this invention is to provide a pump which is easily adaptable to installation in a fluid duct system without re-routing the duct.

One further object of this invention is to provide a pump which is highly efficient in energy transfer and relatively easy and economical to manufacture.

Various other objects, advantages and features of this invention will become apparent to those skilled in theart from the following discussion, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a view of the pump of this invention installed in a line with inlet and outlet conduits and having a remote powering means;

FIG. 2 is a cross-sectional view of the rotatable bladed duct taken on line 22 of FIG. 1;

FIG. 3 is a cross-sectional view of the installed device taken on line 33 of FIG. 1;

FIG. 4 is a cross-section of the flow straightening member taken pn line 44 of FIG. 1;

FIG. 5 is a view of the pump of this invention having two tandemly coupled, individually powered and counter-rotating bladed ducts;

FIG. 6 is a cross-sectional view of the pump of this invention having electrical powering means coaxial with and attached to the bladed duct;

FIG. 7 is a view of the pump of this invention having the powering means operably connected with the rotatable bladed duct by gearing;

FIG. 8 is an end view of the bladed duct having a centerbody;

FIG. 9 is a perspective cross-sectional view of the bladed duct having a centerbody taken on line 9-9 of FIG. 8;

FIG. 10 is an end view of the curved bladed duct without a centerbody;

FIG. 11 is a perspective cross-sectional view of the curved bladed duct without a centerbody taken on line 11-11 of FIG. 10;

FIG. 12 is a longitudinal cross-sectional view of the pump of this invention installed to be belt driven and having a flat bladed duct therein;

FIG. 13 is an end view of the flat bladed duct taken on line 13-13 ofFlG. 12;

FIG. 14 is a perspective cross-sectional view of the flat bladed duct without a centerbody taken on line 1414 of FIG. 13;

FIG. 15 is a graph of test results of head versus flow rate for various impeller rotation speeds relative an impeller embodiment of the invention; and

FIG. 16 is a graph of test results of impeller rotational speed versus head at a constant flow rate relative the impeller tested.

The following is a discussion and description of preferred specific embodiments of the new pump of this invention, such being made with reference to the drawings, whereupon the same reference numerals are used to indicate the same or similar parts and/or structure. It is to be understood that such discusion and description is not to unduly limit the scope of the invention.

The new pump of this invention as disclosed herein includes description and drawings of seven primary preferred specific embodiments, namely, three relative to the pumps internal configuration, three relative to the pumps external configuration and one relative to the use of the propulsion pump in a plural combination. More specifically, the preferred specific embodiments of this invention so disclosed herein are, namely, (l) a rotatable duct section of a fluid flow duct having curved and attached internal blading supporting a centerbody l0, (2) a rotatable duct section of a fluid flow duct having curved and internal blading l2, (3) a rotatable duct section of fluid flow duct having generally flat internally attached blades 14, (4) a means of remotely powering the pump by a motor, engine, turbine or the like connected to the propulsion pump by a belt, chain or like device 16, (5) a means of directly powering the propulsion pump by a motor, engine or the like connected with the pump by means of a gear or contact surface arrangement 18, (6) a means of integrally powering the pump by a motor, engine, turbine or like device connected to the pump such that the bladed duct is integral and coaxial with the powering device 20, (7) a means of operating the pump of this invention in tandem combination with other similar units 22.

Referring to the drawings in detail and in particular to FIG. 1, the pump of this invention is shown in a single unit configuration remotely powered and having flow conduit attached. Generally, the pump of this invention comprises a rotatable bladed duct section 24 generally in line with a flow duct 26 and powered by an attached powering means or driver 28.

The portions of the flow duct 26 adjoining the bladed duct 24 form the inlet thereto and outlet therefrom and having straightening vanes 30 therein to straighten the fluid flow in that area. The straightening vanes 30 cross-sectionally divide the flow within the wall 31 of the flow duct 26. The flow duct 26 joins the bladed duct 24 and is attached in a joint 32 which is fitted with a seal and bearing arrangement to allow the bladed duct to rotate without leakage of the fluid. The inside of the wall 31 of the flow duct 26 and the inside end portion of the bladed duct 24 align to provide a generally smooth surface for the fluid to flow along.

The bladed duct 24 is fitted externally with different means to rotate same as per the above-described preferred specific embodiments. FIG. 1 shows the pump remotely powered 16 by a driver 28 which is connected to the bladed duct 24 by a means of a belt and pulley arrangement 34. In this remotely powered arrangement 16 the bladed duct 24 is fitted with an extended grooved flange 36 therearound and the driver 28 is fitted with a pulley 38. A belt 40 passes around the pulley 38 and the flange 36. The belt and pulley arrangement 34 is shown for convenience, however, it is understood a similar functioning sprockets and chain or like arrangement can also function to remotely power the pump of this invention. When the pump of this invention is directly powered 18 as shown in FIG. 7, the driver 28 is fitted with a hub 42 having a contacting surface which meshes with a similar surface on a flange 44 extending from the bladed duct 24. ln this directly powered arrangement 18, energy is transmitted directly from the driver 28 to the bladed duct 24. Another arrangement to power the pump of this invention is to place the bladed duct 24 internally with the driver 28 like that shown in FIG. 6. The external wall of the bladed duct 24 is integrally attached with the central axial part of the driver 28 so the flow through the bladed duct 24 is along the axis of the driver. In the arrangement shown, the driver 28 is an electric motor with the bladed duct 24 integrally with the armature 46. It is understood that the driver 28 of this integrally powered arrangement 20 could be a turbine, engine or fluid motor in addition to the electric motor arrangement shown in FIG. 6. The pump of this invention is shown in a tandem arrangement 22 in FIG. 5 operably positioned in a flow duct 26.

The bladed ducts 24 of the tandem arrangement 22 are preferably counter rotating and can be powered individually as shown, or by any of the above-described powering embodiments.

The bladed duct 24 is the primary element of the pump of this invention; it can be installed and powered by any of the described embodiments, supra. The bladed duct 24 of this invention as described herein also has several preferred specific embodiments of its internal configuration. One such preferred specific embodiment is shown in FIG. 8 and has somewhat helically curved blades 48 attached to duct wall 50 and curvilinear unattached edges 52. The curved blades 48 support a centerbody 54. The curved blades 48 can be varied in their angular attachment with the duct wall 50 through the preferred range of 15 to 75. The curved blades 48 are tapered generally on one end from a thicker portion 56 attached to the wall 50 to a thinner portion 58 attached to the centerbody 54 and on the other end 60 the curved blades 48 are generally more uniform in thickness. The curved blades 48 attach to the centerbody 54 at its generally central portion and support it such that its longitudinal axis is along the axis of rotation of the bladed duct 24 as it rotates when in operation. The centerbody 54 is fluidically streamlined and somewhat generally cigar shaped with a cylindrical central portion 62 and being tapered to conical ends 64.

In accordance with another preferred specific embodiment of the bladed duct 24 of this invention, a duct is shown in FIG. 10 provided with the wall 50 having curved blades 66 attached somewhat similar to the curved blades 48 described above. The curved blades 66 are generally helical in shape and formed with the inside of the duct wall 50; they can be angularly disposed within the preferred range of 15 to 75. Individually, the blades 66 taper from a thicker section 68 near the wall 50 to a thinner section 70 at the unattached edges 72. The unattached edges 72 of the curved blades 66 have a curvilinear shape and join the attached edge of the blade at the wall 50.

In accordance with another preferred specific embodiment of this invention, shown in FIG. 14, a bladed duct 24 is provided with the duct wall 50 having flat blades 74 attached thereto. The blades 74 are somewhat flat in contour and placed perpendicular to the longitudinal axis of the duct with the opposed unattached edges 76 oppositely inclined to the longitudinal axis within the preferred range of 15 to 75 of inclination, more preferred in the range of 30 to 60. The blades 74 are generally semieliptical in form and are attached to the duct wall 50 of their curved side 76. The flat bladed duct 14 is shown in a remotely powered preferred specific embodiment 16 of this invention in FIG. 12. The 45 angle of blades 74 has been found very satisfactory.

In use and in operation of the pump of this invention in any of the above-described preferred specific embodiments, it is to be understood the bladed duct 24 can be combined with any of the above-described means of powering dependent upon the intended use and imposed limitations.

A pump embodiment of this invention has been tested. It comprised a curved bladed duct with centerbody l0, and an integral powering means 20 as generally described in the following example.

EXAMPLE A pump embodiment of this invention with curved bladed duct having a centerbody like that shown in FIG. 8, and driver like that shown in FIG. 6 were incorporated in a test apparatus.

The test was a qualitative comparison of the impellers of this invention, referred to as the HIVE impeller, and impeller having a blade whose chord increases with distance form the axis or rotation, and a four-bladed impeller, an impeller housing a blade with a constant chord, and both impellers mounted within a like duct to turn therewith.

The four-bladed impeller was fitted with an axially positioned stream-lined teardrop shaped central hub having the more blunt end oriented upstream and having four mutually perpendicular blades extending from the hub to the duct walls. The blades were generally rectangular in shape and oriented at a 5 angle of attack relative to the fluid flow. The fourbladed impeller configuration was within the design parameters of a low head high velocity pump. The test apparatus was arranged with the pump placed in a line between two containers in which the water, which was used as the working fluid, could be kept at a constant level, as it was. The connecting conduit was generally in a straight line between the containers and equipped with devices for measuring pressure before and after the pump and the flow rate of the water. The conduit was about 4 inches in diameter, circular and did not have straightening vanes, nor did it have either an ideal entry or an ideal diffuser.

The four-bladed impeller and the HlVE configuration were tested at various impeller speeds, heads and flow rates, such data being recorded. Additionally, pressure ahead of and behind the pump was measured and the electrical power input to the pump driver was measured and recorded.

A plot of the measured head vs. flow rate for various rotational impeller speeds is shown in FIG. 15. The test apparatus was limited to flow rates and head pressures shown. A comparison of impeller speed and head for a similar flow rate of the two impellers is shown in FIG. 16.

It was an object of the test to operate the two impellers in the stalled and unstalled conditions. For explanation, an impeller is operating in stall condition when the flow separates from the blades rather than follow the contour. The force or head generated by the blade decreases with increasing rotational speed after the stall occurs. As can be seen from both plots of the speed taken, the four-bladed impeller did not produce a substantial increase in head for increasing rotational speed, thus operated substantially in the stalled condition, while for similar speeds the HIVE impeller did not appear to have reached the stalled condition. It can be seen from the constant flow rate curve that for similar impeller rotational speeds at the same flow rate, the HIVE impeller produced approximately 2.5 times the head of the conventional impeller in the range of the heads tested. Additionally, the constant flow rate curve indicates that for that flow rate an optimum head and impeller speed has not been reached in the test for either impeller, since the curve does not show a peak. Measurements taken of the input power to the pump were for a rough reference, and are not specifically presented herein. It was noted that both impellers operated at about the same efficiency.

The following conclusions were deduced from the abovedescribed tests. The produced results indicate the rotatable duct device of this invention performs excellently as a pump, and is capable of being conveniently manufactured and operated as such. The HIVE performed very significantly better than did the four-bladed configuration in pumping water against moderate heads. The four-bladed impeller only performed acceptable within the design parameters as a low head, high velocity pump. No de-rotation devices or diffusers were employed to improve performance, or recover energy present in the fluid or that which is lost due to poor flow handling, although these can be used in final designs of subsequent adaptations of this invention.

As will become apparent from the foregoing description of the pump of this invention, a new means is provided to transfer fluid. The pump is adapted to inline installations and to be powered by various methods and by various sources. The structure itself is relatively simple and has a minimum of moving parts. The pump has structural strength advantages resulting from the shrouded impeller, and the advantages of generally uniform direction of flow in a minimum of space, and with a minimum of moving parts. The pump of this invention is very economical to manufacture and simple to operate and thus adaptable for use in a wide variety of applications.

While the invention has been described in conjunction with specific embodiments thereof, it will be understood that this description is intended to illustrate and not limit the scope of the invention, which is defined by the following claims.

I claim:

1. A fluid pump means comprising:

a. a duct substantially cylindrical internally and having a plurality of curved internal impeller blades attached thereto to rotate therewith and adapted for axial movement of fluid, said impeller blades being substantially similar, disposed to a substantial degree axially within said duct, and positioned uniformly on the sides of said duct at oppositely disposed angles from the axis of said duct, said blades being tapered from a thicker portion adjacent the duct wall to a thinner edge portion, generally helical in contour, having a smoothly formed curvilinear edge smoothly coinciding with said duct wall and generally semi-eliptical in shape;

b. an inlet to and an outlet from said duct having means to couple same with a fluid medium; and

c. a means to couple said duct with a power means adapted to axially rotate said duct.

2. The pump means of claim 1 wherein said duct is cylindrical, and the plane of said impeller blade is disposed at an angle from the axis of said duct in the range of 15 to 75.

3. The pump means of claim 1 wherein said duct is cylindrical, and the plane of said impeller blade is disposed at an angle from the axis of said duct in the range of 30 to 60.

4. A fluid pump as described in claim 1, wherein: said means to couple said duct with said fluid medium has,

a. a bearing member around said duct to hold same substantially in line with a conduit connecting said fluid medium and support for axial rotation of said duct;

b. a seal member around said duct to retain the fluid within said duct and conduit;

c. a flow straightening member within the portion of said conduit connecting said duct and said fluid medium; and

d. said inlet to and outlet from said duct both having said flow straightening member.

5. A fluid pump as described in claim 1, wherein there is a means to remotely couple said duct with a power means adapted to axially rotate said duct,

a. said power means comprising one selected from the group consisting of an engine, motor, and turbine;

b. said duct having an extended flange member therearound adapted to receive a connecting device;

c. said power means having a hub member attached to its output member adapted to receive said connecting device; and

(1. said flange member of said duct and said hub of said power means connected by said connecting device encircling both.

6. A fluid pump as described in claim 1, wherein there is a means to directly couple said duct with a power means adapted to axially rotate said duct,

a. said power means comprising one selected from the group consisting of a motor, engine, and turbine;

b. said duct having an extended flange member therearound adapted with gearing to transmit rolling motion;

0. said power means having a hub member attached to its output member adapted with gearing to transmit rolling motion; and

d. said flange member of said duct and said hub member of said power means operably positioned to contact one another.

7. A fluid pump as described in claim 1, wherein there is a means to integrally couple said duct means with a power means adapted to axially rotate said duct,

a. said power means being selected from the group consisting of a motor, pump, and turbine; and

b. said power means having a passageway therethrough on the axis of the driving member operable to receive, retain, attach and rotate axially said duct.

8. A fluid pump as described in claim 1, wherein:

said duct having internal impeller blade means has means to rotatably couple same with said fluid medium has,

a. a plurality of rotatable ducts like said duct connected in a series fluid circuit; and

b. said ducts are rotatable in opposite directions.

9. A fluid pump means comprising:

a. a duct substantially cylindrical in form internally and having a plurality of internal impeller blades attached thereto to rotate therewith and adapted for axial movement of fluid, said impeller blades disposed to a substantial degree axially within said duct;

b. a streamlined centerbody within said duct;

c. said impeller blades being substantially similar, positioned on sides of said duct at oppositely disposed angles, fixed to said centerbody, and support said centerbody, said centerbody turning with said duct in operation;

d. an inlet to and an outlet from said duct having means to couple same with a fluid medium; and

e. a means to couple said duct with a power means adapted to axially rotate said duct.

10. A fluid pump as described in claim 9, wherein:

said means to couple said duct with said fluid medium has,

ll. A fluid pump as described in claim 9, wherein there is a means to remotely couple said duct with a power means adapted to axially rotate said duct,

d. said flange member of said duct and said hub of said power means connected by said connecting device encircling both.

12. A fluid pump as described in claim 9, wherein there is a means to directly couple said duct with a power means adapted to axially rotate said duct,

c. said power means having a hub member attached to its output member adapted with gearing to transmit rolling motion; and

13. A fluid pump as described in claim 9, wherein there is a means to integrally couple said duct means with a power means adapted to axially rotate said duct,

a said power means being selected from the group consisting of a motor, pump, and turbine; and

b. said power means having a passageway therethrough on the axis of the driving member operable to receive, retain, attach and rotate axialiy said duct.

14. A fluid pump as described in claim 9, wherein:

b. said ducts are rotatable in opposite directions.

15. A pump as described in claim 9, wherein:

a. said impeller blades are tapered from a thicker portion adjacent the duct wall to a thinner edge portion and portion attaching said centerbody; l i b. said impeller blades are of a general semielrptical shape,

helical in contour and have a smooth curvilinear edge which joins said duct wall and said centerbody; and c. said centerbody is generally cylindrical in form and tapered to a cone shape on both ends having points aligned with the axis of said duct and said centerbody.

Claims

1. A fluid pump means comprising: a. a duct substantially cylindrical internally and having a plurality of curved internal impeller blades attached thereto to rotate therewith and adapted for axial movement of fluid, said impeller blades being substantially similar, disposed to a substantial degree axially within said duct, and positioned uniformly on the sides of said duct at oppositely disposed angles from the axis of said duct, said blades being tapered from a thicker portion adjacent the duct wall to a thinner edge portion, generally helical in contour, having a smoothly formed curvilinear edge smoothly coinciding with said duct wall and generally semi-eliptical in shape; b. an inlet to and an outlet from said duct having means to couple same with a fluid medium; and c. a means to couple said duct with a power means adapted to axially rotate said duct.

2. The pump means of claim 1 wherein said duct is cylindrical, and the plane of said impeller blade is disposed at an angle from the axis of said duct in the range of 15* to 75*.

3. The pump means of claim 1 wherein said duct is cylindrical, and the plane of said impeller blade is disposed at an angle from the axis of said duct in the range of 30* to 60*.

4. A fluid pump as described in claim 1, wherein: said means to couple said duct with said fluid medium has, a. a bearing member around said duct to hold same substantially in line with a conduit connecting said fluid medium and support for axial rotation of said duct; b. a seal member around said duct to retain the fluid within said duct and conduit; c. a flow straightening member within the portion of said conduit connecting said duct and said fluid medium; and d. said inlet to and outlet from said duct both having said flow straightening member.

5. A fluid pump as described in claim 1, wherein there is a means to remotely couple said duct with a power means adapted to axially rotate said duct, a. said power means comprising one selected from the group consisting of an engine, motor, and turbine; b. said duct having an extended flange member therearound adapted to receive a connecting Device; c. said power means having a hub member attached to its output member adapted to receive said connecting device; and d. said flange member of said duct and said hub of said power means connected by said connecting device encircling both.

6. A fluid pump as described in claim 1, wherein there is a means to directly couple said duct with a power means adapted to axially rotate said duct, a. said power means comprising one selected from the group consisting of a motor, engine, and turbine; b. said duct having an extended flange member therearound adapted with gearing to transmit rolling motion; c. said power means having a hub member attached to its output member adapted with gearing to transmit rolling motion; and d. said flange member of said duct and said hub member of said power means operably positioned to contact one another.

7. A fluid pump as described in claim 1, wherein there is a means to integrally couple said duct means with a power means adapted to axially rotate said duct, a. said power means being selected from the group consisting of a motor, pump, and turbine; and b. said power means having a passageway therethrough on the axis of the driving member operable to receive, retain, attach and rotate axially said duct.

8. A fluid pump as described in claim 1, wherein: said duct having internal impeller blade means has means to rotatably couple same with said fluid medium has, a. a plurality of rotatable ducts like said duct connected in a series fluid circuit; and b. said ducts are rotatable in opposite directions.

9. A fluid pump means comprising: a. a duct substantially cylindrical in form internally and having a plurality of internal impeller blades attached thereto to rotate therewith and adapted for axial movement of fluid, said impeller blades disposed to a substantial degree axially within said duct; b. a streamlined centerbody within said duct; c. said impeller blades being substantially similar, positioned on sides of said duct at oppositely disposed angles, fixed to said centerbody, and support said centerbody, said centerbody turning with said duct in operation; d. an inlet to and an outlet from said duct having means to couple same with a fluid medium; and e. a means to couple said duct with a power means adapted to axially rotate said duct.

10. A fluid pump as described in claim 9, wherein: said means to couple said duct with said fluid medium has, a. a bearing member around said duct to hold same substantially in line with a conduit connecting said fluid medium and support for axial rotation of said duct; b. a seal member around said duct to retain the fluid within said duct and conduit; c. a flow straightening member within the portion of said conduit connecting said duct and said fluid medium; and d. said inlet to and outlet from said duct both having said flow straightening member.

11. A fluid pump as described in claim 9, wherein there is a means to remotely couple said duct with a power means adapted to axially rotate said duct, a. said power means comprising one selected from the group consisting of an engine, motor, and turbine; b. said duct having an extended flange member therearound adapted to receive a connecting device; c. said power means having a hub member attached to its output member adapted to receive said connecting device; and d. said flange member of said duct and said hub of said power means connected by said connecting device encircling both.

12. A fluid pump as described in claim 9, wherein there is a means to directly couple said duct with a power means adapted to axially rotate said duct, a. said power means comprising one selected from the group consisting of a motor, engine, and turbine; b. said duct having an extended flange member therearound adapted with gearing to transmit rolling motion; c. said power means having a hub member attached to its outPut member adapted with gearing to transmit rolling motion; and d. said flange member of said duct and said hub member of said power means operably positioned to contact one another.

13. A fluid pump as described in claim 9, wherein there is a means to integrally couple said duct means with a power means adapted to axially rotate said duct, a. said power means being selected from the group consisting of a motor, pump, and turbine; and b. said power means having a passageway therethrough on the axis of the driving member operable to receive, retain, attach and rotate axially said duct.

14. A fluid pump as described in claim 9, wherein: said duct having internal impeller blade means has means to rotatably couple same with said fluid medium has, a. a plurality of rotatable ducts like said duct connected in a series fluid circuit; and b. said ducts are rotatable in opposite directions.

15. A pump as described in claim 9, wherein: a. said impeller blades are tapered from a thicker portion adjacent the duct wall to a thinner edge portion and portion attaching said centerbody; b. said impeller blades are of a general semieliptical shape, helical in contour and have a smooth curvilinear edge which joins said duct wall and said centerbody; and c. said centerbody is generally cylindrical in form and tapered to a cone shape on both ends having points aligned with the axis of said duct and said centerbody.