US2393963A - Turbine wheel - Google Patents

Description

Psa-naa Feb. s, i946 j orales TURBINE WHEEL Adolph L. BergeigDaytony, Ohio Application September 22,1944, Serial No. 555,385

, 2 claims (cl. ca -41) (Granted under the act of March` 3. 1883, as amended April 30, 1928; 370 0. G. 757) l The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty `thereon.l

I'his invention relates to turbine wheels and more particularly to turbine wheels adapted to I be operated by the exhaust gases from an internal combustion engine for the .purpose of driving a supercharger or other auxiliary equipment.

Turbine wheels which yare driven by hot exhaust gases are subject to high degrees of heat and consequent rapid deterioration. Accordingly, it is desirable to provide some cooling means to maintain the temperature of such' wheels below that of the 'driving gases. It is, therefore, an object of my invention to provide a turbine wheel structure having provision for maintenance of flow of a cooling medium therethrough and it is a further object oi' my invention to construct a cooling means for a turbine' wheel so ythat a flow of cool air or other gaseous medium is maintained through the interior thereof during operation without the necessity of providing an auxiliary pumping device.

To obtain the above objects, I provide a turbine wheel having a substantially hollow'` interior wherein is supported a bathe plate spaced from the walls of the interior both laterally and peripherally. There is further provided ingress and egress means for a cooling medium on opposite sides oi the baille platel and comprising ports so arranged that the egress port area is disposed at a greater radial distance from the axis of the turbine wheel than the ingress port area, so that diilerential centrifugal forces are thus obtained on the quantities of cooling medium disposed on opposite sides of the baille plate,.whereby a continuous ilow of cooling medium around the baille plate is maintained in the interior of the turbine wheel.

For a more complete understanding of my invention, reference may be had to the appended drawing showing a turbine wheel comprising a body made of generally plate-shaped walls I and 2 and having a series of turbine blades I welded peripherally about the edges of the walls I and 2 by means of welded seams 5, and thereby inclosing a baille plate 6 supported a its center by being welded at 'I to a hub 8 formed integrally at the 6 and a now diverting cone I4 is provided on member I having an axis co-axial with bores Il and I2. A plurality of egress ports I i 'are provided in wall 2 and disposed pe'ipheraily about the hub A tubular shaft I8 is secured as by` welding or the like at Il to the hub 8 with the interior of the shaft communicating with the ingress bore I0 and the turbine wheel is thus supported for rotationf on the tubular shaft I 8.

In operation, a source of gaseous cooling medium such as air is connected through tubular shaft I8 to the interior of the turbine wheel via bores I0 and I2 where it .fills the space on one side of the baille plate 6. When the turbine wheel is rotating, frictional drag on the gaseous cooling means causes rotation thereof and the ensuing centrifugal force compels iiow of the gas radially outward and around the periphery of baille plate 6 and thenceradially downward and through the egress ports I B outwardly of the interior ofthe turbine wheel at the other side of the balde plate. In view of the location of the areas of the egress ports I 6 at a further radial distance from the axis of the turbine wheel than any portion of the cross sectional area of the bore I0, there will be a greater total centrifugal force acting on any radial column of transverse unit area of the cooling medium on the ingress side 0i' baille plate C than on the egress side thereof, whereby a continuous ilow`of cooling medium, as indicated by the arrows, will be maintained while the turbine wheel is rotating, without the necessity of providing auxiliary pumping means of any sort for flow maintenance.

Having thus described my invention, I claim:

1. In a turbine wheel having a wheel body coin-- prised of a pair of walls forming a hollow interior therebetween, a baille plate disposed axially of said whee1 body and supported within said interior and laterally and peripherally spaced from said walls, an ingress channel for a cooling medium comprising an open ended tubular shaft disposed axially of said wheel body, one o! said center of the wall 2. The baille plate '6 iS spaced 50 walls having an axial bore /and being concentrilaterally and peripherally from the faces of walls I and 2 which form the interior of the turbine wheel', as shown. Hub member 8 has an axial ingress bore Il therethrough in alignment with a bore I! provided centrally aboutthe baie plate 5 cally secured to said tubular shaft at the open end thereof, said baille plate having an axial bore therein in communication with the interior of said tubular shaft through the axial bore in said wall whereby said cooling medium has access to o 2 .y 'uw menor o: ma wheel body et one we o: ma

l baille plate, an egress means for said cooling medium comprising a sitesideo: said `body 1 medium is compelled by forces to now in contiguity with said walls from through said wallfaoing the oppobores disposed baille plate and located radially plurality of radially arranged' beyond said tubular shaft and disposed parallel to the axis thereof and having direct communication with the exterior of said ties of cooling medium retained inA saidwheel on opposite of said baille plate having unequal centrifugal forces acting thereon when said turbine wheel is rotating. whereby said cooling said unequal centrifugal wall, the quanti-A e of the bore in said baille plate for diverting axial l flow of s aid cooling medium radially outward of said baille plate said flow diverting cone Iheilig formed on the other of said pair of walls and arranged to protrude into the bore of said baille plate and being concentrically spaced therein.

ADOLPH L. BERGER.

forth in claim'l,v Y

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