US3196799A

US3196799A - Liquids-solids pump

Info

Publication number: US3196799A
Application number: US312064A
Authority: US
Inventors: Isidor R Loss
Original assignee: Ingersoll Rand Co
Current assignee: Ingersoll Rand Co
Priority date: 1963-09-27
Filing date: 1963-09-27
Publication date: 1965-07-27
Anticipated expiration: 1982-07-27

Description

July 27, 1965 l. R. LOSS LIQUIDS-SOLIDS PUMP 2 Sheets-Sheet 1 Filed Sept. 27, 1963 IN VENTOR.

lglDOR R. L0 5 cm izz A FIG. 2

AGENT July 27, 1965 1. R. LOSS LIQUIDS-SOLIDS PUMP 2 Sheets-Sheet 2 Filed Sept. 27, 1963 INVENTOR. L 05 ISIDOR R.

AGENT United States Patent 3,196,799 LIQUIDS-559M338 PUMP Isidor R. Loss, Phillipsburg, N.J., assignor to Ingersoll- Rand Company, New York, N.Y., a corporation of New Jersey Filed Sept. 27, 1963, Ser. No. 312,064 8 Claims. (Cl. 103-107) This invention relates generally to pumps, and more particularly to pumps for handling solids entrained in liquid.

Pumps of this general type are not new as shown in US. patents, Number 2,635,548 granted to C. H. Brawley on April 21, 1952, Number 2,785,930 granted to W. R. Burnside on March 29, 1960, and 2,958,293 granted to R. F. Pray, Jr. on November 1, 1960.

It should be understood that pumps for handling solids entrained in liquids are subject to clogging of the'fiow path and impeller. Therefore, such pumps must provide for unrestricted flow of solids to be handled. To accomplish the necessary free flow, the impeller of such a pump is normally disposed at the end of the pump chamber opposite a center inlet. It should be realized that there is a determinable amount of slippage in rotary pumps of this general type which is amplified when the impeller is removed from the main pump chamber or the pump chamber flow path.

Accordingly, it is an object of this invention to provide a rotary pump for handling solids entrained in liquids that is not readily subject to clogging.

Another object of the present invention is to provide a rotary pump for handling solids entrained in liquids with means to prevent clogging of the impelling means.

Still another object of the present invention is to provide the foregoing type pump with the impelling means removed from the main pump chamber having an improved output.

And another object of the present invention is to provide the foregoing type pump that is of relatively simple and rugged construction and is not subject to malfunction. This invention contemplates a pump for handling solids entrained in liquids comprising a pair of rotatable impellers in spaced face to face relationship, a casing enclosing the impellers and defining a circular pump chamber therebetween on a plane transverse to the axis of rotation of the impellers, said casing having an outlet coplanar with the chamber and tangential to the pump, and an inlet pipe connected to the casing extending towards the axis of the pump to provide solids entrained in liquid to be pumped.

The foregoing and other objects and advantages will appear more fully hereinafter from a consideration of the detailed description which follows, taken together with the accompanying drawings wherein several embodiments of the invention are illustrated by Way of example. It is to be expressly understood, however, that the drawings are for illustration purposes only and are not to be construed as defining the limits of the invention.

FIGURE 1 is an elevational view of a pump made in accordance with the present invention,

FIGURE 2 is a sectional view taken on line 2-2 of FIGURE 1, and

FIGURES 3 and 4 are sectional views similar to FIG- URE 2 each illustrating a modified pump made in accordance with the present invention.

Referring now to the drawings, particularly FIGURES 1 and 2, a pump made in accordance with the present invention has a casing providing a pair of axially spaced end walls 11 and 12 connected to each other at their outer peripheries by an annular wall to define a pump chamber 20. The end walls 11 and 12 have

openings

13 and 1 respectively, that are in axial alignddfibflfid Patented July 27, 1965 ment. The annular wall 15 has a boss face 16 with an inlet opening 17 therethrough that extends radially relative the pump, and a tangentially disposed outlet neck 18 with a flange 19 for connection to a conduit to receive pumped matter. A cover plate 21 is bolted or otherwise connected to wall 11 to close one end of casing 10 and has a recess to provide, with opening 13, an impeller chamber 22 at the end of pump chamber 20. Cover plate 21 has a centrally disposed cup portion 23 for housing a bearing 24, as will be further discussed.

A second cover plate 25 is bolted or otherwise connected to wall 12 to close the other end of casing 10 and is recessed to provide, with opening 14., a second impeller chamber 26 at the other end of pump chamber 20 from and in axial alinement with impeller chamber 22. Cover plate 25 has a boss 27 with a through bore 28 that is counterbored to house a bearing 29, the bore 28 and bearing 29 being in axial alinement with each other and with bearing 24.

Impellers

30 and 31 are rotatably disposed in spaced face to face relationship to one another in

impeller recesses

22 and 26, respectively, and are connected to a shaft 32 that extends through bore 28 and is rotated by a motor 33.

Impellers

30 and 31 have hubs supported in

bearings

24 and 29, respectively, while a ring plate 35 is bolted to and cooperates with boss 27 to house a seal 34 against leakage along shaft 32. It should be understood that

bearings

24 and 29 could rotatably support shaft 32 instead of

impeller

30 and 31.

A flanged inlet pipe 36 is connected to the cross face 16 of Wall 15 and extend-s radially inwardly through opening 17 toward the center of chamber 20 which is a low pressure area when the pump is in operation. Radially disposed pipe 36 may be replaced by an offset pipe 37, as shown in FIGURE 1, which provides inlet fluid to the low pressure area of pump chamber 20 and in a direction with flow therein. As a further modification a combination of

inlet pipes

36 and 37 may be provided. Although the inlet opening 17 is angularly offset approximately 270 from outlet 18, this angular relationship is for illustration purposes only and is not to be construed as defining the limits of the present invention.

In operation, solid-s entrained in liquid enter the central low pressure area of pump chamber 20 through inlet pipe 36 and/ or 37, and is driven in a circular path around the axis of the pump, which is the axis of rotation of shaft 32, by the

impellers

30 and 31. Centrifugal force due to the circular flow in chamber 20 urges the liquid and solids towards wall 15, and out of the pump through tangential outlet 18. It should now be understood that the material being pumped does not sharply change direction, and with impelling forces acting on both sides of the flow in chamber 20 provides the pump with improved output efliciency while maintaining the aforementioned non-clogging features.

Impellers

30 and 31 are made in the usual manner by providing an annular recess in the impeller face in which is disposed a series of spaced vanes. Alternately, the impellers may be manufactured by providing an annular series of spaced pockets, the material therebetween acting as vanes. To reduce the tendency of the pockets or spaces between the vanes of the impellers to become clogged by solids carried by the fluid being pumped,

impellers

30 and 31 may be rotated at speeds different from each other but in the same direction.

To accomplish such diiferential speed, as shown in IGURE 3, a hollow shaft 42 is provided in place of shaft 32 and is connected only to impeller 31. A second shaft 41 is provided which extends through shaft 42 and is connected only to impeller 30. Motor 33, in this instance, is connected through a conventional gear box 44) to rotate

shafts

41 and 42 in the same direction and each at a speed diiferent than the other. To vary or adjust the speed differential of

shaft

41 and 42 or impellers 3t) and 31, gear ratio changes (not shown) well known in the art may be incorporated in gear box 40.

Another means for rotating

impellers

30 and 31 at speeds independent of each other is shown in FIGURE 4. In this modification, shaft 32 is connected to only impeller 31, and cover plate 21 is replaced by a cover plate 25A which corresponds to cover plate 25. Cover plate 25A now provides the impeller recess 22 and has a boss 27A for housing a bearing 29A that rotatably supports the hub of impeller 30. Boss 27A has a bore 28A through which extends a shaft 32A that is connected to only impeller 30 and is driven by a motor 33A. A ring 35A is provided to cooperate With boss 27A to a seal 34A against leakage along shaft 32A. Thus, in this instance, the rotational speeds 3t) and 31 are individually derived by independently controlled

motors

33A and 33, respectively.

It should now be readily understood that a novel rotary pump with improved output capabilities is provided for handling solids entrained in liquids that has desired non-clogging features and impeling means on both sides of the flowing mass when the pump is in operation.

Although several embodiments of the invention have been illustrated and described in detail, it is to be expressly understood that the invention is not limited thereto. Various changes may be made in the design and arrangement of the parts Without departing from the spirit and scope of the invention as the same will now be understood by those skilled in the art.

I claim:

1. A rotary pump for handling solids entrained in liquids, comprising:

a pump casing having a pair of axially spaced end Walls and a peripheral wall joined to the end Walls to define a pump chamber with tangential discharge means at its outer periphery for pumped fluid;

the end walls each having a circular recess of smaller diameter than the pump chamber and in communication with the pump chamber;

shaft means extending into the pump casing and into the end wall recesses;

a pair of open faced impellers disposed in spaced faceto-face relationship each in one of the end wall recesses with its open face in unrestricted communication with the pump chamber and being mounted on the shaft means for rotation thereby to impel fluid in the chamber for pumping; and

inlet means extending through the peripheral wall into the pump chamber between the impellers and terminating adjacent the shaft means for supplying fluid thereto to be pumped.

2. A rotary pump in accordance with claim 1, and the inlet means comprising:

a pipe connected to the peripheral casing Wall which extends inwardly between the impellers toward the center of the chamber to provide liquid to be pumped directly to the low pressure area of the chamber; and

the peripheral casing Wall having an opening therethrough for the pipe to permit the pipe to communicate with a source of fluid to be pumped.

3. A rotary pump in accordance with claim 2, and:

the pipe being spaced from the impellers to prevent solids in the liquid being pumped from being trapped between the pipe and the impeller faces, and between the pipe and the end Walls.

A rotary pump for handling solids entrained in liquids, comprising:

shaft means extending into the pump casing and into the end wall recesses;

inlet means extending radially into the pump chamber between the impellers and terminating adjacent the shaft means for supplying fluid to be pumped to the chamber.

5. A rotary pump for handling solids entrained in liquids, comprising:

shaft means extending into the pump casing and into the end wall recesses;

inlet means extending into the pump between the impellers offset from a radial toward the shaft means in the direction of flow in the chamber and terminating adjacent the shaft means for supplying fluid to be pumped to the chamber.

6. A rotary pump for handling solids entrained in liquids, comprising:

a shaft extending axially through the chamber into the end wall recesses and outwardly from the casing through one of the end walls;

a pair of open faced impellers mounted in spaced faceto-face relationship on the shaft for rotation in unison thereby to impel fluid in the chamber for p p e;

each impeller being disposed in one of the end wall recesses and having its open face in unrestricted communication with the chamber; and

an inlet extending through the peripheral Wall into the pump chamber between the impellers and terminatmg adjacent the shaft for supplying fluid thereto to be pumped.

7. A rotary pump for handling solids entrained in liquids, comprising:

a pair of shafts each extending through one of the end walls and into the recess of the wall through which it extends;

a pair of open faced impellers each disposed in one of the end wall recesses with its open face in unrestricted communication With the chamber and being mounted on the shaft in the same recess for rotation thereby independent of the rotation of the other impeller to impel fluid in the chamber for pumping; and

an inlet extending through the peripheral wall into the pump chamber between the impellers and terminating adjacent the shafts for supplying fluid thereto to be pumped.

8. A rotary pump for handling solids entrained in liquids, comprising:

a tubular shaft extending through one of the end walls and into the recess of the wall through which it extends, and another shaft extending through the tubular shaft and the pump chamber into the other end wall recess;

References Cited by the Examiner UNITED STATES PATENTS 921,118 5/09 Kasley 253-77 1,395,464 11/21 Woock 103107 2,635,548 4/53 Brawley l03l03 2,985,108 5/61 Stoner et al 103-105 X 3,131,877 5/64 Budzien 103--111 DONLEY J. STOCKING, Primary Examiner.

HENRY F. RADUAZO, Examiner.

Claims

1. A ROTARY PUMP FOR HANDLING SOLIDS ENTRAINED IN LIQUIDS, COMPRISING: A PUMP CASING HAVING A PAIR OF AXIALLY SPACED END WALLS AN A PERIPHERAL WALL JOINED TO THE END WALLS TO DEFINE A PUMP CHAMBER WITH TANGENTIAL DISCHARGE MEANS AT ITS OUTER PERIPHERY FOR PUMPED FLUID; THE END WALLS EACH HAVING A CIRCULAR RECESS OF SMALLER DIAMETER THAN THE PUMP CHAMBER AND IN COMMUNICATION WITH THE PUMP CHAMBER; SHAFT MEANS EXTENDING INTO THE PUMP CASING AND INTO THE END WALL RECESSES; A PAIR OF OPEN FACED IMPELLERS DISPOSED IN SPACED FACETO-FACE RELATIONSHIP EACH IN ONE OF THE END WALL RECESSES WITH ITS OPEN FACE IN UNRESTRICED COMMUNICATION WITH THE PUMP CHAMBER AND BEING MOUNTED