US1631591A - Combined liquid and air pump - Google Patents

Description

n 7 1927. e E. HILL COMBINED LIQUID AND AIR PUMP Filed June 7., 1926 uvvggvjok A TT ORNE Y Patented June 7, 1927.

UNITED STATES 1,631,591 PATENT OFFIQE. d.

EBENEZER HILL; OF SOUTH NORWALK, CONNECTICUT, ASSIGNOR TO THE HILL COM- PBESSOR & PUMP COMPANY, OF NEW YORK. N. Y., A CORPORATION OF DELAWARE.

comnmnn LIQUID Anniim rumr.

Application filed June 7,

- close to force fluid t erefrom.

The object of the present invention is to provide a pump of this character which is specially designed for mixing and pumping fluids having diflerent qualities, such a i pump being adapted to supply fuel, for ex ample air and oil, under pressure in a vaorized condition to the burner of an oil eater. This object is attained by locating the in- I take for air at such a point that a slight vacuum is created in the pockets during the rotation of the annular and pinion before those pockets reach the air intake, and providing a fluid intake on the intake side of 5 the gears as they rotate, between the discharge and the air intake whereby fluid will be first drawn into the pockets as they come around and then air drawn in. The fluid and air become mixed in the pockets and are 1 finally discharged under'pressure with the fluid atomized. With this arrangement not only is the fluid broken up and mixed with the air and discharged under pressure, but it becomes heated by the compressing action of the pump and somewhat gasified.v Furthermore, the fluid will act, under proper conditions, both to lubricate the movin parts and seal the joints.

In the accompanying drawings Fig. 1

shows a longitudinal section on the line 1-1 on Fig. 2, of a pump that embodies this invention. Fig. 2 shows an end view of the pump. The pump illustrated, as far as therotors I and their 'co-operation is concerned 'is of the type shown and described in Patent #1,505,707 issued to me August 19, .1924.

In the pump illustrated the casing 11, which is enerally circular in outline, contains a cyTindrical pumping chamber 2 that is closed on one end by a head 3 which is fastened to the casing by ani suitable means. The casing has an air inta e passage 4 on one side and a discharge passage 5 on the is a rotor 8.

1926. Serial No. 114,138.

movement axially in the ,pumping cham er The hub 9 of the. rotor is mounted on anti-friction bearings 10-the' l inner ring 11 of which is fastened to the hub While the outer ring 12 is fitted so that it may have a slight axlal movement in the casing. The driving shaft 13 is splined in the hub of the rotor so that while the shaft will drive the rotor it will not interfere with the axial movement of the rotor.

Fastened in the rotor 8 is an internally toothed gear or annular 14, and engaging the teeth of this gear are the teeth of'an externally toothed gear or pinion 15. The pinion is mounted on anti-friction bearings 16 that are supported by a stud 17 fastened in the head. This stud is positioned out of axial line with the driving'shaft so that the axis of the pinion will be eccentric to the axis of the annular. The pinion, preferably, hasone less tooth than the annular and the teeth coa'ct to cause the opening and closing of the pockets 18 which effect the pumping or compression of the fluids in the well known manner.

A spring 19 is arrangedin a cavity 20 in the casing that communicates with the pumping chamber, in such manner that the spring thrusts against the outer race ring 12 and through the bearing presses the edge of. the rotor and the faces of the pumping gears toward the inner face of the head 'Lubricant is introduced into this cavity.

Leading from the reservoir 21 which is connected with the discharge and into which the fluid is pumped, to the cavity containing the spring may be a pipe 22. The function of this connection is to admit dischar. e pressure to the cavity and permit it to e exerted on the back of the rotor. This connection also is adapted to conduct back lubricant which has passed through the pump. Any common type of packing 23 may be arranged in the end of the casing to prevent leakage from the spring cavity around the driving shaft.

In carrying out this invention a ort 24 is made through the casing head to t e path of the rotor pockets. This ort is located between the air intake port, a ove described,-

'2. On this side the pockets open as the gears turn. A pipe 25 leading from the source of fluid supply, such as fuel oil, is connected by a fitting 26 with this port, a needle valve being arranged in this fitting to control the flow of fluid therethrough. 7

With this arran ement of ports a slight vacuum is create in the pockets before they reach the first or fluid port. This tends to draw in oil, if oil be the fluid, through the port 24 into the pockets as they reach it, the amount bein regulated by the needle valve. If desire the oil could be supplied under some outside initial pressure but for ordinary uses there is suflicient vacuum created to draw in the proper quantity of oil for the purpose desired. When the pockets reach the air intake port air is drawn in the pockets containing the oil. As the gears move beyond th s point and the pockets decrease in volumetric capacity, the oil and air become mixed and'compressed and when the pockets reach the discharge port the mixture is forced out under such pressure that the oil vis atomized- Under normal conditions heat is generated by the compression of the air and this tends to vaiporize the oil and render it more readily in ammable. The vapor may be discharged into a tank as shown or may be led directly to the place of use. With the connections illustrated pressure fromthe tank will be exerted on the back of the rotors to balance the ressure on the front of the rotors, and as the air which exerts that pressure contains oil lubrication will be supplied to the backs of the rotors. The oil that is drawn in bythe pump lubricates the front of the rotors and acts to seal the joints and ensure efficient pumping action. With this invention a single pump may be employed for delivering 011 and air immediately to a burner.

beneath a boiler or other heater, properly mixed and vaporized, and with uniform velocity to produce the required even heat when i ited.

The invention claimed is 1. A rotary pump comprising a casing containing a pum ing chamber, an annular toothed rotor and a inion rotor rotatable in said chamber, sai annular and pinion intermeshing and mounted in eccentric relation with the latter having fewer teeth than the former, whereby pockets that open and close are produced between the teeth as the rotors turn, a discharge port opening through the casing from the path of contracting pockets, and a plurality of intake ports opening through the casing to the path plurality of intake ports opening through the casing to the path of the pockets, both of said intake, ports being so located with relation to the path of the pockets that the pockets are expanding and a partial vacuum results in the pockets before they reach the ports as the rotors turn.

3. A rotary pump comprising a casing containing a pumping chamber, an annular toothed rotor and a inion rotor rotatable in said chamber, sai annular and pinion intermeshing and mounted in eccentric relation with the latter having fewer teeth than the former, whereby pockets that expand and contract are produced between the teeth as the rotors turn, a discharge port through the casing from the pathof the pockets adjacent to the locality of greatest contraction of said pockets, an intake ort through the casing to the path of expanding pockets, and

an intake port through the casing to the path of the expanding pockets between the discharge port. and the firstv mentioned intake port, on the intake side as the rotors turn.

4. A rotary pump comprising a casing containing a pum ing chamber, an annular toothed rotorand a inion rotor rotatable in' said chamber, sai annular and pinion intermeshing and mounted in eccentric relation with the latter havin fewer teeth than the former, whereby poc ets that/expand and contrac are produced between the teeth as the rotors turn, a discharge port through the casing from the path of the pockets, adjacent to the locality of greatest contraction of said pockets, an intake port through the casing to the path 'of expanding pockets, an intake port through the casing to the path of expanding pockets between the discharge port and first mentioned intake ort, on the intake side as the rotors turn, an a valve for controlling the passage to said intermediate intake port.

5. rotary pump comprising a casing contalning a pumping chamber, an annular toothed rotor and a pinion rotor rotatable in said chamber, said annular and pinion intermeshing and mounted in eccentric relation with the latter havin fewer teeth than the former, whereby poc ets that expand and contract are produced between the teeth as the rotors turn, a discharge port opening through the casing from the path of contracting pockets, and two intake ports opening through the casin to the path of expanding pockets where y liquid mey be first drawn into the pockets through one intake port and air then drawn into the pockets through the other intake port by a vacuum ull, and discharged under pressure in an to intermingled vaporized condition through the discharge port, as the rotors turn.

EBEZER HILL.v

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