US2324116A

US2324116A - Rotary oil pump

Info

Publication number: US2324116A
Application number: US385342A
Authority: US
Inventors: Sivertsen Gudmund
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-03-26
Filing date: 1941-03-26
Publication date: 1943-07-13
Anticipated expiration: 1960-07-13

Description

July 13, 1943. G. SIVERTSEN 2,324,116

ROTARY OIL PUMP Filed March 26, '1941 Fical.

A AT RNEY Patented July 13, 1943 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to rotary pumps, and more particularly to a novel compact multiple pump structure for supplying an oil burner with a. predetermined mixture of air and oil.

In accordance with the invention I provide a compact sectional casing having spaced connected chambers, housing a gear pump and an im peller unit. The gear pump and the impeller unit are used to respectively and successively mix and atomize suitable proportions of oil and air, in two stages. The oil is supplied to the gear pump by gravity feed through an external controllable valve. The use of an oil sump is rendered superfluous. The pump of the invention contains no restricted passages or needle valves, avoiding the danger of clogging.

Prior pump units for oil burners employed a special pump to feed the oil from a reservoir to an oil sump. The oil in the sump was drawn up by another pump which also mixed it with a suitable proportion of air. The thus obtained mixture of oil and air was atomized by an impeller and discharged through a burner nozzle. A pump was required for returning the oil into the reservoir.

It is among the objects of the invention to provide a novel compact multiple pump structure of simple construction which operates without an oil sump.

Another object of the invention is to provide an oil burner pump with no restricted passages or needle valves that are likely to clog up.

Still another object of the invention is to provide a novel pump unit for oil burners containing a gear pump for initially admixing the oil and air, and an impeller pump for'atomizing the mixture of oil and air.

These and further objects of the invention will become apparent in the following description of preferred embodiments thereof illustrated in the drawing, wherein:

Figure 1 is a longitudinal vertical section of a pump unit in accordance with the invention.

Figure 2 is a transverse section taken along the line 2-2 of Figure 1, showing the gear pump used for mixing oil and air.

Figure 3 is a transverse section taken along the line 33 of Figure 1., showing the impeller unit for atomizing the mixture of oil and air.

Referring to the drawing. my novel pump structure comprises bed plate i having rigidly mounted thereon the sectional pump casing. The casing comprises a plurality of disk and housing sections. The housing sections are open on both sides, while the disk section abuts the sides of the housing sections, greatly facilitating its con struction and assembly. The pump casing comprises disk sections l3 and i5 and housing sections l2 and I4.

The oil is preferably supplied to the pump by gravity feed from the tank indicated at It. Pipe line I! connects tank It with duct l3 bored through disk section l. A magnetically operated valve l9 and an adjusting needle valve 2!] are arranged in pipe line H, both valves being schematically indicated in the drawing.

Duct 18 in disk section I! is connected with oil nozzle 2|. Oil nozzle 2| extends through air passage 22 provided in disk section H to space 23 provided in the mixing chamber 24. Mixing chamber 24 is arranged in housing section l2. Space 23 and air passage 22 are connected by channel 25, bored. through disk section II. A timing gear pump comprising two gears 26 and 21 i arranged in mixing chamber 24. Timing gear 26 is keyed to main shaft 28 and timing gear 2! is secured to shaft 29. Timing gear pump 26, 21 sucks in the air through air passage 22 and mixes it with the oil taken up by the passing air from oil nozzle 2|.

Passage 30 in disk section |3 is connected with mixing chamber 24 as well as with conduit 3| in disk section l4 to impeller chamber 32. Impeller chamber 32 houses a pair of meshing impeller units 33, 34, each preferably having two blades. Impeller 33 is keyed to the main shaft 28. Impeller 34 is secured to shaft 29. Conduit 35 in housing section |4 connects impeller chamber 32 with pipe 36 connected with oil nozzle 31. Oil

' nozzle 31 is arranged with the burner or furnace,

not shown in the drawing, directly supplying the combustible mixtur thereto.

Main shaft 28 is connected with drive shaft 4|] and electric motor 4| by flexible coupling 38. Motor 4| is fastened onto bed plate l0. Bearing 42 is arranged in a projecting hub of disk section l5, for main shaft 28. An oil collecting chamber 43 is provided behind bearing 42. Channel 44 communicates from impeller chamber 32 to shaft 28 at its bearing, affording suitable lubrication for the bearing. The oil is directed to collecting chamber 43 and returned to impeller chamber 32 through conduit 45.

In practice, the operation of my simplified oil pump is as follows: Oil from tank I 6 reaches nozzle 2| by gravity feed in a regulated manner. The regulation of the oil flow is through magnetically operated valve l9 and adjustable through needle valve 20. Motor 4| rotates shaft 28 through flexible coupling 38. Gear 26 keyed to shaft 28 meshes with gear 21 which, in turn, drives shaft 29. Thus, gears 26 and 2! ensure the timed rotation of impeller blades 33, 34.

Continuous rotation of timing gear-pump 26, 21 draws in the air from passage 22 which, in turn, takes up the oil from nozzle 2|. The air passage through channel 25 is concentric about the oil flow, and both reach mixing chamber 24 together. It is to be understood that the air flow to mixing chamber 24 may be independently regulated. The gears 26, 21 pulverize the oil for a first stage admixture with the air. The admixed oil and air are thereupon forced into impeller chamber 32 for atomizing action by impeller 33, 34. The mixture of oil and air is atomized into the proper combustible mixture for the furnace and impelled to fuel nozzle 31 through opening 35.

Various changes and modifications may be made to the details of construction of the inven tion without departing from the broader spirit and scope thereof, as set forth in the following claim.

I claim:

A pumping unit for oil burners comprising a sectional casing, embodying a mixing chamber, a mixing pump located therein, an atomizing chamber, an atomizing pump therein, means for operating the two pumps in timed relation, an air inlet, including a vertical portion connectable to a source of air supply, and a horizontal portion communicating with said mixing chamber below the pump therein, an oil nozzle concentrically disposed within the horizontal portion of said inlet and extending therethrough into said mixing chamber, in proximity to said mixing pump, whereby the oil issuing from said nozzle will be subjected to the action of the surrounding stream of air in its introduction to said mixing chamber, a passage leading from the top of said mixing chamber, including a horizontal portion merging into a vertical portion, parallel with the vertical portion of said inlet, a second horizontal portion parallel to the base of the unit merging into a vertical portion opening into th atomizing chamber beneath the atomizing pump, a vertically disposed discharge outlet leading from the top of the latter chamber and a fuel nozzle connected to said outlet, the defining surfaces of said passages to said mixing chamber and between the latter and the atomizing chamber, together with those of the two chambers and said discharge outlet, being uninterrupted and constituting a continuous closed conduit, wholly contained within said casing, to conduct the fluids through the casing for discharge therefrom into the fuel nozzle, in the ultimate combustible mixture, in a constant unidirectional movement from said inlet to said outlet.

GUDMUND SIVERTSEN.