US3050011A

US3050011A - Rotary pump

Info

Publication number: US3050011A
Application number: US814490A
Authority: US
Inventors: Karl Martin; Rexroth Walter
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-05-20
Filing date: 1959-05-20
Publication date: 1962-08-21
Anticipated expiration: 1979-08-21

Description

Aug. 21, 1962 M. KARL ETAL 3,050,011

ROTARY PUMP Filed May 20, 1959 FIG.

o 0 0 o /s- F I G. 3 INVENTORS 24' MARTIN KARL WALTER REXROTH /4- BY F I G. 2

ATT EY iinited grates 3,050,011 ROTARY PUNIP Martin Karl, 48 Reed St., Pontiac, R.I., and Walter Rexroth, New London Turnpike, West Warwick, RI. Filed May 20, 1959, Ser. No. 814,490 4 Claims. (Cl. 103126) Our present invention relates to pumps, and more particularly to a novel construction of a rotary pressure pump.

The principal object of the present invention is to provide a rotary pressure pump which will deliver a given quantity of liquid with less horsepower than that required by conventional pumps.

A further object of the present invention is to provide a rotary pressure pump which will deliver a given quantity of liquid with a smaller size pump than that required by conventional pumps.

Another object of the present invention is to provide a rotary pressure pump having a minimum number of moving parts.

With the above and other objects and advantageous features in view, our invention consists of a novel arrangement of parts, more fully disclosed in the detailed description following, in conjunction with the accompanying drawings, and more particularly defined in the appended claims.

In the drawings,

FIG. 1 is an enlarged section taken on line 1-1 on FIG. 2.

FIG. 2 is a top plan view of the pump with the cover removed.

FIG. 3 is a view similar to FIG. 2 with the blades turned ninety degrees.

In various types of pumping operations, liquid or chemicals must be circulated in large quantities and often in both directions. Gear pumps, normally used for this purpose are inefficient and wear quickly when operated at high speeds. The present invention provides a rotary pressure pump utilizing impellers in the place of gears to eliminate wear. Furthermore, the pump of the present invention is designed to circulate large quantities of liquid with a minimum of power.

Referring more in detail to the drawings, the pump of the present invention comprises a generally rectangular housing having an end wall 11 and side walls 12 integrally therewith. The housin is provided with solid corners 13 to form a generally oval pump cavity 14. The other end wall 15 comprises a removable cover which is retained on the end walls 12 by a plurality of bolts 16 and sealed with a gasket 17. A pair of spaced

parallel shafts

18 and 19 extend through the end wall 11, through the pump cavity 14 and are journaled in bearings 2t) and 21 respectively in the cover portion 15.

Mounted on a shaft 18 in the cavity 14- is an impeller blade 22. Mounted on the shaft 19 is a complementary impeller blade 23 identical with the blade 22. The

impeller blades

22 and 23 are provided with opposite curved edges 24 comprising segments of circles and terminating in a curved blade edge 25 which forms a complete circle when the impeller blades are clearing each other as shown in FIG. 2. The impeller blades rotate in opposite directions and are designed to barely touch in the position shown in FIG. 2 and to be separated to allow free passage of liquid therebetween in the position shown in FIG. 3. The inlet openings 26 are in the end walls 12 on opposite sides between the impeller blades.

The pump of the present invention is reversible. Experience has shown that where ordinary bearings are provided, the strain of reversing the direction of rotation 3,5,ll Patented Aug. 21, 1962 frequently dislodges the bearings. It is therefore preferred that the bearings be mounted as shown in FIG. 1. Each

shaft

18 and 19 passes through a bearing 27 having permanent type lubricated packing 28. The bearings 27 are provided with external flanges 29. A plurality of bolts 30 extend through the flanges 29 and into the end wall 11 to lock the bearing in place and prevent twisting movement of the bearing. Externally of the pump housing, the

shafts

13 and 19 are provided with meshing gears 31 so that if the shaft 18 is driven in one direction the shaft 19 will be driven in the opposite direction at the same speed. The gears 31 are timing gears and may be adjusted to set the initial position of the impellers with respect to each other.

The applicants have found that the above construction permits the delivery of large quantities of liquid with about one-half of the horsepower required by other types of pumps and with only half the size of conventional gear pumps. The pump of the present invention will pump or circulate any chemical and will easily pump sludge or muddy water. Where the water is being pumped from a tank or reservoir positioned above the pump, the blades are set as shown in FIGS. 2 and 3. In the position shown in FIG. 3, when no pressure is being applied, the water can flow freely through the pump by gravity. This permits rapid circulation of large quantities of Water. When the pump must apply pressures at all times the impellers are first positioned at right angles to each other so that there is never any opening between the impellers in any position to permit the back pressure through the pump.

Since there are no meshing gears, wear is reduced to a minimum and the pump will operate efficiently over long periods of time. The pump can be housed in an external housing so that the gears 31 can operate in grease at all times. This will provide quiet operation and long life. Other advantages of the present invention will be readily apparent to a person skilled in the art.

We claim:

1. A reversible circulating pump comprising a housing having side walls and one end wall, a cover for the other end of said housing, said housing having an oval cavity, a pair of spaced parallel shafts extending through said end wall and cavity and into said cover, an impeller mounted in said cavity on each shaft, an inlet and outlet opening in opposite side wall portions of said housing between said shafts, and intermeshing timing gears on said shafts outside of said housing, said impellers being identical, each having a general S-shape with thick central portions tapering to a curved point at each end, said shafts extending through the center of said central portions, the axes of the said impellers being so spaced that the respective ends intermesh but so positioned that one end of one will clear the end of the other when they are rotated in opposite directions, the inside curve of each blade end forming a circle with the inside curve of the blade of the intermeshing impeller, the thickness and curvature of said impellers being so shaped that they sealingly contact each other at all times during rotation when said impellers are initially positioned at right angles to each other.

2. A reversible circulating pump comprising a housing having side walls and one end wall, a cover for the other end of said housing, said housing having an oval cavity, a pair of spaced parallel shafts extending through said end wall and cavity and into said cover, an impeller mounted in said cavity on each shaft, an inlet and outlet opening in opposite side wall portions of said housing between said shafts, and intermeshing timing gears on said shafts outside of said housing, said cover and end wall having bearings for said shafts, said end wall bearings each including a T-shaped bearing having bolts passing through the cross portion for anchoring said bearings to said end wall, said impellers being identical, each having a general S-shape with thick central portions tapering to a curved point at each end, said shafts ex tending through the center of said central portions, the axes of the said impellers being so spaced that the respective ends intermesh but so positioned that one end of one will clear the end of the oher when they are rotated in opposite directions, the inside curve of each blade end forming a circle with the inside curve of the blade of the intermeshing impeller, the thickness and curvature of said impellers being so shaped that they sealingly contact each other at all times during rotation when said impellers are initially positioned at right angles to each other.

3. A reversible circulating pump comprising a housing having side walls and one end wall, a cover for the other end of said housing, said housing having an oval cavity, a pair of spaced parallel shafts extending through said end wall and cavity and into said cover, an impeller mounted in said cavity on each shaft, an inlet and outlet opening in opposite side wall portions of said housing between said shafts, and intermeshing timing gears on said shafts outside of said housing, said impellers being identical, each having a general S-shape with thick central portions tapering to a curved point at each end, said shafts extending through the center of said central portions, the axes of the said impellers being so spaced that the respective ends intermesh but so positioned that one end of one will clear the end of the other when they are rotated in opposite directions, the inside curve of each blade end forming a circle with the inside curve of the blade of the intermeshing impeller, the thickness and curvature of said impellers being so shaped that they sealingly contact each other at all times during rotation when said impellers are initially positioned at right angles to each other, said timing gears permitting changes in the relative position of said impellers to provide for a space more than sealing clearance between said impellers at all times during the rotation of said impellers when they are initially placed in parallel position.

4. A reversible circulating pump comprising a housing having side walls and one end wall, a cover for the other end of said housing, said housing having an oval cavity, a pair of spaced parallel shafts extending through said end wall and cavity and into said cover, an impeller mounted in said cavity on each shaft, an inlet and outlet opening in opposite'side wall portions of said housing between said shafts, and intermeshing timing gears on said shafts outside of said housing, said cover and end wall having bearings for said shafts, said end wall bearings each including a T-shaped bearing having bolts passing through the cross portion for anchoring said hearings to said end wall, said impellers being identical, each having a general S-shape with thick central portions tapering to a curved point at each end, said shafts extending through the center of said central portions, the axes of the said impellers being so spaced that the respective ends intermesh but so positioned that one end of one will clear the end of the other when they are rotated in opposite directions, the inside curve of each blade end forming a circle with the inside curve of the blade of the 'intermeshing impellers, the thickness and curvature of said impellers being so shaped that they sealingly contact'each other at all times during rotation when said impellers are initially positioned at right angles to each other, said timing gears permitting changes in the relative position of said impellers to provide for a space more than sealing clearance between said impellers at all times during the rotation of said impellers when they are initially placed in parallel position.

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