US2500532A - Cooling means for machines - Google Patents

Description

A. s. FENEMORE COOLING MEANS FOR MACHINES March 14, 1950 Filed Aug. 21, 1947 I, flag INVENTOR Elan .S'. F'ene'more.

ATTORNEY WITNESSES: I fizwz 72w. 4,

Patented Mar. 14, 1950 UNITED STATES i ia'llENT OFFICE COOLING MEANS FOR MACHINES Application August 21, 1947, Serial No. 769,905 In Great Britain July 29, 1941 Section 1, Public Law 690, August 8, 194.6 Patent expires July 29, 1961 3 Claims. 1

My invention relates to apparatus for ventilating machines and more particularly to apparatus forms-re effectively ventilating and thus cooling dynamo-electric machines used as swinging frame dynamometers.

One broad object of my invention is the provis on of ventilating apparatus for enclosed machines that shall be reliable, inexpensive, and eflicient, and that does not require the designing and building of ventilating apparatus into the machine itself.

Another broad object of my invention is the provision of apparatus for vent'lating a dynamoelectric machine used as a. swinging frame dynamometer.

A somewhat more specific object of my invention is the provision of moving cooling air to the interior of a swinging frame dynamometer from an outside source in such manner that no appreciable drag is imposed on the movement of the frame or in any other manner interfering with the swinging movement of the frame.

The objects stated are merely illustrative of the Fig. 4 is a longitudinal sectional view showing a form of my invention applied to a dynamo-electric machine;

Fig. 5 is a vew of a transversesection, on line VV of Fig. 4;

Fig. 6 is a transverse sectional view of modified. construction of my invention; and

Fig. '7 is a longitudinal sectional view, on line VII-VII of Fig. 6.

In Fig. 1, I show the supply conduit l, for supplying cooling air to the interior of the swinging frame 2, provided with the shoe 3 conforming to the contour of the cylindrical outer surface of the S2. The cylindrical swinging frame l is provided with an opening l registering with the axial region of the supply conduit. The disposition of the shoe 3 with reference to the frame 2 is such that only a relatively small radial airgap is provided between the two parts 2 and 3. Cooling air flowing, under some pressure, from conduit I in the direction indicated by the arrow {5 will thus enter the opening 4 and only a relatively small leakage will take place at the radial airgap 6. The circumferential extent of the opening of conduit l is so chosen, for the usual angular swing of dynamometer frames, that the swinging of the frame 2 will not cause opening l to move out of registry with the opening of conduit I.

When the swing of the dynamometer frame, as frame H2, is through some considerable angle from a neutral position, then I provide the frame [2 with several oocnings I l circumferentially spaced as shown in Fig. 3, and I extend the shoe portion for conduit ll into a complete belt l3 encircling the frame l2.

In Fig. 4 I show my invention, of the form shown in Figs. 1 and. 2, appl'ed to a dynamoelectric machine used as a dynamometer. The rotor R is mounted on the arbor A disposed to 1'0- ste in the bearings B disposed in the frame 22. The frame 22 is mounted for rotation in bearings B in the frame structure FS of the dynamometer.

The shoe 3 is disposed within the groove 21. The shoe 3. by being thus disposed in the groove 2'5, more effectively directs the cooling air from conduit I into the frame 22. In order to eliminate the possibilitv of the cooling air affecting the indications of the dynamometer by improper flow of the air through the frame I provide the frame 22 with baffles 28 and 29.

The baffle 28 is provided with a plurality of holes that do not match the opening it. The cooling air entering the frame 22 is thus evenl distributed in the left end of the frame 22 and thus flows substantially uniformly through the openings 39, over the rotor R and through the stator S to the region of baffie 29. This assures that the cooling air flows over the commutator and then out through the openings 3|.

When the angular dynamometer frame movement is large and it is not feasible, or desirable to use the construction shown in Figs. 1 to 5 inclusive then the type of structure ShOWn in Figs. 6 and '7 may be utilized.

In the structure shown in Figs. 6 and '7, the frame 42 is provided with a single opening 44, but the conduit ll is provided with a shoe portion do that is in the form of a hood 53 disposed over a circumferential sector of the frame 42 and in the form of an encircling belt 63 over the remaining portion of the circumference of the frame i2.

While I have discussed but a few embodiments of my invention, it is apparent that others, once having had the benefit of my teachings, may devise similar apparatus. I, therefore, do not wish to be limited to the particular embodiments shown but wish to be limited only by the scope of the claims hereto appended.

I claim as my invention:

1. In combination with a swinging frame type dynamometer, a cylindrical frame mounted for angular movement about its axis, said cylindrical frame being provided with a radial inlet opening in the cylindrical surface near one end of the frame, and provided with an axially disposed opening in the end remote from the end provided with the radial inlet, and conduit means provided with a shoe sector encompassing a portion of the cylindrical frame over the radial opening, whereby cooling air flowing in the conduit means toward the frame will enter said cylindrical frame through the radial inlet and emerge from the frame through the axially disposed opening.

2. In a ventilating system for a dynamo-e1ectric swinging frame type dynamometer, in combinat on, a base, a swinging frame, having a cylindrical surface at least at one region thereof, mounted for swinging movement in the base, said frame carrying the armature of a dynamo-elem other opening remote from the first opening for if discharging the cooling air supplied by the conduit to the swinging frame.

3. In a ventilating system, in combination, a base, a cylindrical container having a radial opening in the cylindrical surface for receiving ventilating air and an opening at one end thereof for discharging the ventilating air, bearings in the base for the container so that the container is rotatably mounted with reference to the base, a conduit mounted in fixed relation to the base and disposed so that the end thereof is in registry with the radial opening in the container when the container is in its normal position, and a hood secured to the end of the conduit for directing the cooling air into the radial opening even though the container moves from its normal position.

ALAN STEPHEN FENEMORE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,118,215 Mossman Nov. 24, 1914 1,451,577 Jantzen Apr. 10, 1923 1,523,822 Marret Jan. 20, 1925 1,750,873 Buck Mar. 18, 1930 1,305,332 Gcss May 12, 1931 2,057,637 Schneider Oct. 13, 1936 2,351,963 Hayes June 20, 1944 2,352,317 Goff June 27, 1944 FOREIGN PATENTS Number Country Date 494,497 Great Britain Oct. 26, 1938

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