US1238292A - Ventilating construction for dynamo-electric machines. - Google Patents

Description

R. E. HELLMUND.

VENTILAHNG zuNsTRuCioN Fori :avremo summe MACHINES.

APPLICATION PILU! M105 lil-J.

1,238,292. lateutcd Aug. 28, 1917.'

UNITED STATES PATENT OFFICE.

RUDOLF E. HELLMUND, 0F PITTSBURGH, IPENNSYLVANIA, ASSIGNOR TO WESTING- i HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENN- SYLVANIA.

VENTILATING' CONSTRUCTION FOR DYNAMO-ELECTRIC MACHINES.

Specification of Letters Paten .Patented Aug. 28, 1917.

Application filed August 6, 1915. Serial No. 43,99811,

Y?) all whom it may concern:

Be it known that I, RUDOLF E. H nnLuUSn, a subject ol' the Emperor of Germany, and a resident of Pittsburgh, in the county of Alle gheuy and State of Pennsylvania., have invented :t new and useful improvement in Ventilating Constructions 4 for Dynamo- Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric machines provided with forced-draft venti lating means. and it has special reference to motors for railway service in which ventilating currents of air are caused topass through end openings in the motor armatures by means of fans secured to the armature shafts.

The objects of m. invention are to improve the eicieney of Ventilating devices of the above indicated character and to prevent the entrance of water, or other foreign substances,through the ventilating openings.

In the accompanying drawing, Figure-Ltb is an axial sectional view of a portion of a railway motor equipped with Ventilating means constructed in accordance with my invention, and Fig. 2 is a transverse sectional view taken partially along the line H-II and partially along the line III-III of Fig. 1.

In ventilated railway motors of the type in which the circulation of air is accomplished by means of centrifugal fans adapted to draw air through the armature and discharge it through openings in the motor housing adjacent to the fan, the most eiii- -cient ventilation can be obtained if the airy leaving the tan is permitted to escape directly from the motor housing without being deflected. Such an arrangement, however,

has the disadvantage that water, snow and other foreign substances can readily enter through the discharge openings and reach the armature core through the fan and its supply openings. According to my present invention, I so -construct the air passages associated with the fan that any water which may enter the fan is trapped and drained out of the motor without entering the armature core.

Referring to the accompanying drawing,V

the machine here shown comprises a stationary frame 1 having eld -m,agnet colls 2 mounted on polar projections 3, a bearingi housing 4 and an armature having a lami natcd core nwmbcr .3, a winding (i and a shaft T. 'lhc armature shaft is rotatably supported in bearings, one of which is shown at associated with the hearing housing 4.

The laminated core member 5 of the armature is provided with longitudinal passages E), and a centrifugal fan 10provided with radhilly-extending blades 11 confined between annular plates 12, is secured to the shaft, between the arn'iature core 5 and the bearing 8.

Adjacent to the outer periphery of the fan 10. the hearing housing 4 is provided with a series of discharge openings13, shown in Fig. 1. .It will be noted that air discharged from the fan is enabled to ass directlrthrongh the openings 13 wit out deflection. The inner end of each of the passages formed h v the fan blades 11 and the plates' the drawing, currents of air are caused to pass through the Ventilating passages 9, by means of' the fan 10, in the directions indicated by the arrows in Fig. 1. Any'water or other foreign substance which may enter the fan through the openin 13 is trapped in the depressions 14 an is discharged through the lower o enings 13 by the centrifugal force of the an, assisted by gravity. The free escape of air from-the fan is, therefore, unobstructed, while the entrance of water into the motor is eiectually pre-- vented. Y

It isto be understood that-myinvention is notl restricted to the precise structural details which I have shown and described, but that any modifications may be effected within the spirit of my invention which fall within the scope ofthe appended claims.

Iclaim as my invention:

1. In a dynamo-electric machine, the combination with a stationary member, a rota.- table member provided with longitudinal Ventilating passages, a casing inclosing the said members and provided with Ventilating enter the fan throu openings, and a fan embodying n set ot air passages communicating with the ventilating passages in the sind rotatable member and anothci set of passages communicating directly with said Ventilating openings, of means located intermediate the said sets of passages for trapping foreign matter that may enter the fan through seid openings.

2. In a dynamo-electric machine, the combination with a stationary member, a rotatable member,V a casing inclosing the said members and provided with openings for the passage of air, and a ventilating fan as- Sociabed with the-said rotatable member and having a direct and unobstructed communication with the external atmosphere through ,the said openings, of means for trapping foreign matter that may enter the fan through the said openings.

3. A dynamoeleetric machine comprising a stationary member, a, rotatable member, n casing inelosing the said members and pro` vided with openings for the passage of air, and a Ventilating fan associated with the said rotatable member and embodying a trap for stopping foreign. matter that may h the said openings.

'4. In a dynamo-e estrie machine, the combination with a stiitionurv member. n. rotafor the passage of air, and a fan embodying air passages communicating With the venti' lating passages in the said rotatable member and adapted to force air directly, and without deflection, through the openings in the seid casing, of means located at the entrance to the said air passages for trapping foreign matter that muy enter the fan.

5. A dynamo-electric machine comprising a stationar member, a rotatable member }V=rovided with longitudinal Ventilating passages, a easing inelosing the said members and provided with openings for the passage of air, and a fan embodying air passages communicating with the Ventilating passages in the said rotatable member and other radially-disposed directly toward the o enings in the said casing, the inner end o each of the said'radially-disposed passages being provided with a water-trapping depression.

In testimony whereof, I have hereunto subscribed my name this 29th day of July 1915.

RUDOLF E. HELLMUND.

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