US3329095A

US3329095A - Booster pump

Info

Publication number: US3329095A
Application number: US508004A
Authority: US
Inventors: Henning G Bartels
Original assignee: Individual
Current assignee: Individual
Priority date: 1965-11-16
Filing date: 1965-11-16
Publication date: 1967-07-04
Anticipated expiration: 1984-07-04

Description

July 4, v1967 H, G, BARTELS 3,329,095

BOOSTER PUMP Filed Nov. 16, 1965 United States Patent O 3,329,095 BOOSTER PUMP Henning G. Bartels, Harvestedhuder Weg 48, Hamburg, Germany Filed Nov. 16, 1965, Ser. No. 508,004 3 Claims. (Cl. 103-87) ABSTRACT F THE DISCLOSURE In a pump wherein the impeller is moved axially between an inoperative and an operative position, depending upon whether or not the `driving -motor is deenergized or energized, an annular bushing is provided which is secured to the impeller, surrounds the impeller intake and fits into an enlarged section of the pump intake when the impeller is in the operative position to substantially close off the space between the impeller intake and the pump casing at that time, with the bushing providing a face against which fluid pressure will act to move the impeller toward the inoperative position when the motor is deenergized. With the bushing moved out of the way the area for fluid ilow with the pump inoperative is greatly increased.

This invention relates to fluid moving apparatus for temporarily increasing the pressure or speed of a fluid continuously flowing through a pipe line. More particularly, the invention constitutes an improvement over the device disclosed in my U.S. Patent No. 2,824,520 of Feb. 25, 1958.

An important object of the invention is automatically to change the intake area in a connected pump pipeline due to axial movement of the rotor of an inner electric motor. When the pump is activated, the intake area is reduced but when the motor is idle this Opening becomes larger.

In a centrifugal pump with a submerged electric rotor and impeller on the same shaft, the axial movement of the shaft, due to the energization of the motor for operation, magnetically attracts the rotor to the motor stator and pushes the rotor and the impeller toward the intake, reducing the pump intake. The opposite movement opening the inlet, with the electric motor turned off, is due to the hydraulic force and pressure of t-he fluid normally flowing in the pipe and returning the rotor and impeller to normal position.

Other objects and advantages of the invention will appear in the specification and claims. The construction and operation will be more clearly understood from the following description of a specific embodiment in connection with the accompanying drawings, in which:

FIGURE 1 is a longitudinal sectional view of the device of the present invention in its maximum pressure position with the rotor activated; and

FIGURE Z is a longitudinal sectional View similar to FIGURE l, but showing the impeller blade and rotor in its other limiting position with the motor unactivated.

In a centrifugal pump construction, during the idle period of the pump, a large cross-sectional area is needed to insure eiicient flow of the liquid. A decreased area such as occurs when pumping produces eddy currents and causes eddy losses when the pump is not operating as a pump. While the pump is at rest a booster pressure pump should have the same or even larger cross-sectional area than the connected pipe line.

Referring now more particularly to t-he drawings, a pipe line pump comprises a casing with an inlet 11 and an outlet passage 12 built into a pipe line in 3,329,095 Patented July 4, 1967 ICC which the device is to be used and in which the uid How is in the direction indicated.

An electric motor means comprising a circular fixed stator 13 is located in the casing 10 and spaced axially from the inner -surface thereof t-o form a fluid passageway 12 between the casing and the stator. Within the stator is a rotor 14 mounted on a shaft 16 which is movable endwise by the magnetism of its electric actuation in a direction opposite the fluid flow, and in the reverse direction by the flow and pressure of fluid therein.

At the inlet end is a circular impeller 15 secured to the shaft 16 with a plurality of radiating tubular jets 19 larger near the inner or intake ends 15a adjacent the shaft but slightly decreasing at the outlets 15b discharging near the inside of the casing 10 and having a surrounding tubular (annular) end bushing 17 mounted in advance of the impeller tube intakes. This bushing has an outer diameter to t in the enlarged section 11a of the pipe inlet 11 and an inwardly inclined surface 20 leading to the outside of the impeller inlet. The tubular jets 19 receive the impact of fluid owing in the pipe and accelerate the fluid throwing it outwardly when the electric pump is actuated.

vTo accelerate and direct fluid efliciently from the jets 19, a guiding inlet ring 18 in the casing 10` having inlet openings 21 of a diameter to receive the outer ends of the jets 19, is rounded outwardly with slightly larger discharge openings 22, or has a diameter larger than the inlet, which throws the fluid outwardly and directs it in the longitudinal direction of the casing 10.

Thus, the jets of the impeller 16 and this accelerator guiding ring 18 act to receive the fluids and accelerate them to the degree most beneficial and ecient by the rotation of the propeller shaft 16.

When the electric motor is energized, the rotor 14 is drawn endwise with its shaft 16 against the flow pressure of uid to move the bushing 17 to closing position as shown in FIGURE 1; thus, the operation of t-he rotor 14 causes the passage 12 to be reduced at the inlet 11 and the jets 19 increase the flow and pressure of fluid in the passage.

When the electric current is shut olf, the stator 13 and its shaft 16 are moved with the impeller 15 by the flow of liquid in the casing 10, to the position shown by FIGURE 2, enlarging the flow passage 12 at the inlet and reducing the pressure of fluid in the casing.

I claim:

1. In an apparatus for increasing the pressure of Huid in a pipe line and comprising a casing having walls dening an inlet, and electric motor within and spaced from the walls of the casing to define a fluid passageway thereabout, said motor having a shaft coaxial with said inlet and movable axially, and impeller means secured to the inlet end of said shaft, said impeller means having an intake adjacent said shaft and an outlet at a greater radial distance from the shaft, the arrangement being such that when the motor is deenergized the impeller means is in an inoperative position and from said inoperative position when the motor is energized the shaft moves axially toward said inlet to a second position at which said impeller means is operative to pump fluid from said inlet toward said passageway, the improvement comprising: said impeller means intake being substantially smaller in diameter about said shaft than is the inlet of the casing; an annular bushing (17) secured to said shaft and coaxial therewith, said bushing being external of said impeller means intake, said bushing being of a size to substantially close the space between said impeller means intake and the casing at the inlet when said impeller means is in the second position, said bushing being moved back away from the casing at the inlet a substantial distance when the impeller means is in the inoperative position to permit uid to How freely therebetween.

2. In an apparatus as set forth in claim 1 wherein said casing has an enlarged section (11a) at said inlet and the periphery o! aid bushing is received in said enlarged section When the impeller means is in the second position.

3. In an apparatus as set forth in claim 1, wherein said bushing has an inclined face (20) extending out- Wardly and upstream from said impeller means intake.

References Cited UNITED STATES PATENTS 2,987,002 6/ 1961 Schipper 103-87 FOREIGN PATENTS 1,103,764 4/1961 Germany.

10 ROBERT M. WALKER, Primary Examiner.

Claims

1. IN AN APPARATUS FOR INCREASING THE PRESSURE OF FLUID IN A PIPE LINE AND COMPRISING A CASING HAVING WALLS DEFINING AN INLET, AND ELECTRIC MOTOR WITHIN AND SPACED FROM THE WALLS OF THE CASING TO DEFINE A FLUID PASSAGEWAY THEREABOUT, SAID MOTOR HAVING A SHAFT COAXIAL WITH SAID INLET AND MOVABLE AXIALLY, AND IMPELLER MEANS SECURED TO THE INLET END OF SAID SHAFT, SAID IMPELLER MEANS HAVING AN INTAKE ADJACENT SAID SHAFT AND AN OUTLET AT A GREATER RADIAL DISTANCE FROM THE SHAFT, THE ARRANGEMENT BEING SUCH THAT WHEN THE MOTOR IS DEENERGIZED THE IMPELLER MEANS IS IN AN INOPERATIVE POSITION AND FROM SAID INOPERATIVE POSITION WHEN THE MOTOR IS ENERGIZED THE SHAFT MOVES AXIALLY TOWARD SAID INLET TO A SECOND POSITION AT WHICH SAID IMPELLER MEANS IS OPERATIVE TO PUMP FLUID FROM SAID INLET TOWARD SAID PASSAGEWAY, THE IMPROVEMENT COMPRISING: SAID IMPELLER MEANS INTAKE BEING SUBSTANTIALLY SMALLER IN DIAMETER ABOUT SAID SHAFT THAN IS THE INLET OF THE CASING; AN ANNULAR BUSHING (17) SECURED TO SAID SHAFT AND COAXIAL THEREWITH, SAID BUSHING BEING EXTERNAL OF SAID IMPELLER MEANS INTAKE, SAID BUSHING BEING OF A SIZE TO SUBSTANTIALLY CLOSE THE SPACE BETWEEN SAID IMPELLER MEANS INTAKE AND THE CASING AT THE INLET WHEN SAID IMPELLER MEANS IS IN THE SECOND POSITION, SAID BUSHING BEING MOVED BACK AWAY FROM THE CASING AT THE INLET A SUBSTANTIAL DISTANCE WHEN THE IMPELLER MEANS IS IN THE INOPERATIVE POSITION TO PERMIT FLUID TO FLOW FREELY THEREBETWEEN.