US819820A - Ventilating means for inclosed machines. - Google Patents

Description

PATENTED MAY 8, 1906v E. M. TINGLEY. VENTILATING MEANS FOR INOLOSED MACHINES.

APPLICATION FILED HAR.17.1905.

WITNESSES In order shaft and located in the shaft-bearings are located in shaft into the UNITED STATES PATENT oi rron EGBERT M. TINGLEY, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & PoRATIo or PENNSYLVANIA.

MANUFACTURING COMPANY, A COR- VENTILATIJfJC-Ji MEANS FOR IhlCLOSED MACHINES- and useful Improvement in Ventilating Means for Inclosed Machines, of which the following is a specification.

My invention relates to means for establishing and maintaining. forced ventilation for machines, and particularly to inclosing casings for such means. 1

The object of my invention is to provide means to be employed in combination with machine-casings for preventing leakage atundesired locations. l

that the heat due to the losses in the electrical and magnetic circuits of certain types of dynamo-electric machines may be readily dissipated, it hasbeen found desirable to provide means for enforcing ventilation of the machine structure. Such a means and animproved machine structure constitute the subject-matter of another application, Serial N 0. 250,614, filed by me of even date herewith, and comprise inlet-ports, inlet chambers surrounding the shaft, a:

chamber containing the dynamo-electric Inach1ne,-passages between the chambers, and suitable propellers or blowers carried by the passages to produce a draft from each inlet-chamber into the machinechamber.

1 Since there is a tendency to exhaust the air from the inlet-chambers, leakage-currents from the exterior into those'chambers may occur. through the openings in their walls which receive'the ends of the shaft, and if the proximity to the apertures in the chamber-walls leakagecurrents may convey particles of oil from the machine-chamber, which may then be deposited in the ventilating-passages or upon the windings f the machine. Even if the bearings are not located inproximity to the apertures in the ends of the inclosing casing it is desirable to prevent leakage of air that may be warm and laden with moisture and particles of dust and oil into the machine from the engine-room in which the machine is located. Y

It is the specific object of my invention to Specification of Letters Patent. Application filed March 17, 1905. Serial .embod .for the projecting ends of 1 at the bottom of Patented m,- s, 1906.

No. 250,615. a

provide means for preventing leakage from the exterior into interior chambers through apertures in the chamber-walls that accommodate the projecting ends of a shaft or any other movable members. 1

My invention is illustrated in the accompanying drawings, Figure 1 of which is a view in end el with, certain parts being broken away for the sake of clearness of illustration; and Fig. 2 is a view, partially in horizontal longitudinal section and partially in plan, of the machine shown in F ig. 1.

The dynamo-electric machine 1, that comprises a stationary armature 2, a rotatable field-magnet 3, and a shaft 4, maybe of any suitable construction known in the art, except as regards the ventilating devices which y my present invention, and since these devices are alike at the two ends of the machine I have illustrated'them' at one end only, it being understood that a'similar illustration of the other end of the machine would be a mere duplication. The ends of the machine-frame are provided with inclosing end bells 5, having centrally-located apertures 6, through which the ends of the shaft 4 project, suitable bearings 7 being provided the shaft.

Mounted u on the shaft 4 in proximity to the ends of the rotatable field-magnet 3 are collars 8, in the peripheries of which propeller-blades 9 are secured at such angles as to produce drafts of air toward the field-magnet when the mac end bells 5 are provided with inlet-ports 10 the machine, which communicate with inlet-chambers 11, that are formed by the end bells and partitions 12, having centrallylocated apertures 13 sur rounded byinwardl -eXtending short cylindrical shells 14, the collar 8 and its propellerblades 9 being located within the'cylindrical shell.

The portions of the walls of the inletchambers that surround the apertures 6 are depressed, and annular plates 15 cover the depressions, thereby forming chambers 16, that surround the shaft. Communication between the chambers 16 and the chamber containing the armature and field-magnets is vation of a dynamo-electric- 'machlne constructed in accordanc therehine 1s in operation. The

provided by means of tubes 17, the ends of I municating (passages between the pressure which perforate the partitions 12 and the inner walls of the chambers 16, substantially as shown; 4

5 When the machine is in operation, the

propeller blades 9 establish a circulation 0m the inlet-port 10 and the inlet-chamber 11 to the chamber containing the armature and field-magnets, and as a consequence the 1 air in the machine-chamber is under com ression while the air in the inlet-chamber 1 1 1s being exhausted. As the tubes 17 provide communication between the machine-chamand the chambers 16, the air in the cham- 5,16 also under compression, and escape 1.: efrom is provided only through the range-s aces between the edges of the .ap-

rturesan the shaft. Currents will thereestablished from thechambers 16 to 20 he exterior and into the inlet-chamber 11,

will prevent the ingress of air through tEgflearance-spaees between the shaft and t and bells.

om the description and drawings it is 5 seen that leakage from the exterior to the inletrehamber is effectually prevented by means of the chambers 16, inwhich the air is maintamed under pressure, and that no air which 's saturated or laden with particles of oil will ev supplied to the machine for ventilation v desire it to be understood that my invention is not limited to. electrical machines, since it may be applied to any machine in which fluid packings are desired for a memher that has either a rotary or a reciprocatory m tion v I, 341 has my invention- 1. The combination with a shaft, an inlet- 4 chamber, a pressure-chamber, and means for efieeting a circulation from the inlet chamber to the pressurtz-chamben; of a third-l chamber surrounding the shaft, and one or more communicating passages between the pressurechamber and the third chamber.

2. The combination with a shaft, an inletehamber, a pressure chamber, and means for establishing a circulation from the inlet to the pressure chamber, ofan outer chamber surrounding the shaft, and one or more communicating passages between the pressureehamber and the outer chamber.

3. The combination with a shaft, inlet and pressure chambers, and means for establishing a circulation from the inlet-chamber to the pressure-chamber, of a third chamber surrounding the shaft and one or more comchamber an the third chamber.

4. The combination with a shaft, an inletchamber, and a pressure-chamber, of a third chamber surrounding the shaft and means for maintaining a fluid-pressure in the third chamber. v a v 5. The combination of an inlet-chamber, a movable member that projects through the walls of the chamber, and awchaniber surrounding-the said movable member in which a fluid-pressure is maintained.-

6. The combinationof a chamber from which fluid is xhaustedand having an aper-- tured wall, a movable member that projects through the wall-aperture, and a chamber that surrounds the movable member adjacent to the aperture and in which a fluidpressure is maintained.

7. The combination of an apertured chamber-wall the fluidspressures on opposite sides of which differ, a member that is movably located in the aperture in the chamber-wall, and a chamber that surrounds the movable member adjacent to the aperture and in which a fluid-pressure is maintained.

8. The combination with an apertured chamber-wall the fluid-pressures on opposite sides of which differ, of a member that is movably located in the wall-aperture and an annular cover that cooperates with the chamher-wall adjacent to the aperture to form an auxiliary chamber, and-means for Suppl mg fluid-pressure to said auxiliary chamber.

9. The combination with a shaft and a casmg having two chambers between which exists a difference of fluid-pressure, of an annular chamber the inner wall of-which is the shaft, and, a conduit between said annular chamber and the casing-chamber in which exists the higher pressure.

10. The combination with a casing having a chamber in which the fluid-pressure exceeds that of the atmosphere, of a member that movably projects through the walls of the casing, a chamberthat surrounds the movable member'adjacent to the casing-wall, and one or more conduits between said surrounding chamber and the high-pressure chamber.

In testimony whereof I have hereunto subscribed my name this 11th day of March,

. EGBERT M. TINGLEY.

Witnesses:

, WEsLEY G. CARR,

BIRNEY HINEs.

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