US 1909578 A
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Ma 16; 1933;" J. c. FRANKE 1,909,578 4 PUMP Y Filed m. 4, 1930 2 sheets-$11651; 1
Jzwemor: faerizgawiu y 1933 J. c. FRANKE 1,909,578
Filed Dec. 4, 1930 2 Sheets-Sheet 2 Patented May 16, 1933 UNITED STATES PATENT OFFICE JOHN GUARD FRANKE, OF .BERLIN-WILMERSDOBF, GERMANY, ASSIGNOR TO N. V.
OCTROOI MAATSCHAPPI-T HERMES, .OF AMSTERDAM, NETHERLANDS, A CORPORA- TION OF THE NETHERLANDS PUMP Application filed December 4, 1930, Serial No. 500,090, and in Germany February 5, 1930.
M invention relates to pumps, and more particularly'to the type in which a unit including an engine and a pump is supported It is an object of my invention to so design a float pump of this type that it will not tip. To this end I arrange the engine in the float.
As a rule the engine is an electric motor.
It is old in pumps to combine the motor and the impeller into a pump unit, and to suspend the unit from the delivery pipe of the pump so that it is immersed in the liquid. In such pumps the stufling box between the motor and the pump is diflicult to hold tight, particularly if there is a considerable head of water on'the stuffing box. As a rule it is necessary to provide a compressor for maintaining a definite counter pressure at the stufling box. This drawback was eliminated by providing a float for the unit, and placing the unit on top of the float, with the stufling box above the water level. This type obviously V has a high center of gravity and therefore it must be held against tipping by suspending it from the delivery pipe, or by supporting it on the walls of the well in which the pump floats. Apart from this the unit is in an unfavorable position with respect to damage w by falling stones, dirt, and water.
By arranging the engine within the float as suggested by me, the center of gravity of the system is lowered and there is no longer- 5 any tipping tendency, and the stufling box 3 is relieved of the high head to which it is exposed in immersed pumps. The head acting on the stufling box is only equal to the distance from the stufling box to the water level.
It is another object of my invention to reduce still further, or to relieve altogether, even this small head.
To this end I provide a closed float with an opening, or openings, in its base.
By these means the entrapped air is placed under a certain pressure at one side of the 'stufiing box which counteracts, or balances, thi pressure due to the head at the opposite si e.
In the accompanying drawings a pump with a float having a closed base, and a float with openings in its base, are illustrated by way of example.
In the dr'awings Fig. 1 is an axial section through the float of the first type, V
Fig. 2 is an axial section through the base of the motor-and-pump unit,
Fig. 3 is a section on the line 3-3 in Fig. 2,
Fig. 4 is a plan view of the impeller, viewed from below,
Fig. 5 is a plan view of the impeller guide, also viewed from below, and
Fig.6 is an axial section through the float I of the second type.
Referring now to the drawings, 1 is the casing ofthe pump, 2 is the casing of the engine, here shown as an electric motor, and 3 is the float. The casings 1 and 2 are connected by a threaded sleeve 22-, and the easing 1 of the oump is connected to the float 3 by flanges 4 and 5 and a threaded ring 6.
The motor casing 2 is arranged in the float 3 and current is supplied to the motor by a cable 7 which is admitted through the cover of the float, and a rubber sleeve 8. 9 is a handle on the cover of the float. a
10 is the shaft of the motor, Fig. 2, 23 is a ball bearing in which the shaft is mounted to rotate, and 24 is a partition at the base of the pump casing l on which the bearing 23 is erected, with a stufling box 11 below the. bear ing. 12 is the impeller which is seated on the free end of the shaft 10, and equipped with spiral blades 13, Fig. 4, and 25 is a guide which is fitted on-the threaded end of the shaft 10 so as to hold the impeller 12 on a shoulder at the shaft. This guide has helical passages. 14 for supplying Water to the impeller 12 near its boss.
15, Fig. 5,-is the delivery passage of the pump, 16 is a connection at the end of the passage, and 17 is a delivery pipe at the end of the connection.
18 is a guard protecting the pump from access of grit etc., having openings defined by bars 19, and wire netting 20 extending across the openings.
The float 3 in Fig. 1 need not be closed at the top as the air in the float is not under pressure from the liquid. h is the head on the stuffing box 11.
The head is normallysmall so that thestufling box 11 will stand it. It may be desirable, however, to still further reduce the pressure on the stuffing box. A pump with means for reducing the pressure is shown in Fig. 6. Here the float 3 must beclosed at the top, and provided with openings 21 in its base. The openings admit water to the base of the float, and the water is kept away from the motor casing 2 by a tube 26. The water which penetrates into the float compresses the air in the float and a reaction is generated which counteracts the head it. The effective head on the stufling box is determined by the head it and the head h, from bearing 11 to the level of Water ii the float 3. The stuiflng box is re lieved altogether if arranged at the level of the liquid in which the float 3 is suspended.
1. Aportable pump comprising a. float; and a unit including an engine arranged within said float, .a pump below said engine and having an inlet, and a guard having screened openings arranged below said pump to guard the inlet thereof.
2. A portable pump comprising a float, and a unit including an engine and a pump supported by said float, said engine being within said float.
3. A portable pump comprising a closed float, with an opening in its base, a unit including an engine and a. pump supported by said float, said engine being within said float, and packing means intermediate said engine and said pump.
In testimony whereof, I afix my signature.
JOHN COARD FRANK'E.