US2057196A - Dynamo-electric machine filter - Google Patents

Description

Oct. 13, 1936. L, A, K CH, JR 2,057,196

DYNAMO-ELECTRIC MACHINE FILTER Filed Dec. 23, 1952 VII/I glwuzntox LOUIS A. KOCH JR.

firflu Patented Oct. 13, 1936 PATENT OFFICE DYNAMO-ELECTRIC MACHINE FILTER Louis A. Koch,

Jr., Louisville, Ky.

Application December 23, 1932, Serial No. 648,523

4 Claims.

This invention relates to replaceable air filter structure particularly applicable to dynamo-electric machines, such as used on automotive vehicles.

The principal object of this invention is the production of an air filter structure that will occupy unused limited space adjacent an automotive dynamo and effectively remove foreign matter from air as it is forced through a wall of the dynamo to the interior for removing destructive heat incident to electric overloads that are imposed on the windings, commutator and brushes and has a direct application to the principles of generator cooling set forth in applicants copending application, Ser. No. 641,481.

A further object is the accomplishment of the above stated object with positive and inexpensive equipment and of a type that can be readily understood and sufiiciently accessible and easily manipulated to insure the desideratum.

The means employed according to this invention constitutes structure wherein the special air filter or cleaning equipment can be built into the unit during its manufacture or it can be subsequently lodged adjacent, or to same, and organized to function as if it has been originally built into the apparatus.

It is at once apparent that the apparatus provided by this invention for maintaining the generator at full normal capacity would enable a given size of generator unit to care for a greater volt-ampere output than if the unit were not so equipped.

Other objects and advantages of the structure are hereinafter set forth in detail and will be apparent to persons skilled in the art to which the invention relates and to these advantages in so far as they are patentably novel I will claim, the same as hereinafter set forth.

apertured face plate shown in cross section in Fig. 1, also in Fig. 6.

Figs. 3 and 3A represent respectively the top and elevational views of the air filter strap or cover.

Fig. 4 is a perspective view of the air filter medium on an enlarged scale.

Fig. 5 is an elevation of the end view of the drive end housing member of the generator to disclose the part as prepared for admitting air, dotted lines indicate the filter location.

Fig. 6 is a cross sectional view of Fig. 5 along line 6, 6, together with the filter strap of Fig. 3, and the filter face plate of Fig. 2 added and forming a housing or frame for the filter medium shown in Fig. 4.

Fig. '7 is a plan view of a section of the air filter strap, while Fig. 8 is a cross section of Fig. 7 along the line 8, 8.

Fig. 9 is a side elevational View of a modified structure of an air filter strap or cover.

Fig. 10 is a cross sectional view of an end plate of the generator to which is attached the air filter strap Fig. 9, with an air filter medium lodged therein.

Structure Numeral it indicates an electric generator, I l a radiator cooling fan, both of which are attached to and operated by internal combustion engine l2 by belt l3 in the conventional way, there being pulley I2A attached to the main crank shaft of the engine, pulley l IA fixed on the shaft that operates the radiator fan and pulley IBA fixed on to shaft [4 of the generator mounted in bearings l5, l6. This shaft [4 carries the armature on which are mounted the commutator, laminae and windings after the conventional practice.

Bearing I5 is a part of end housing H which is altered to provide openings [8 to admit air currents, indicated by arrows, created by fan blades IOB disposed between pulley [0A and the end housing, also by auxiliary fan I9 fixed to shaft [4 and disposed between said housing and the windings.

Between fan blades IOB and housing ll there is located a special type of air filter medium 20, disposed in a very special type of housing or matrix consisting of face plate 2| secured to end housing I! by screws 22 and a strap member 23 which surrounds the face plate and is lodged on same as well as on the end plate ll. It is essential to keep filter pad clean, therefore easy means are provided by employing a flimsy amorphous medium which is incompetent, by reason of its structure, to take and keep a sufficiently definite form and still function as a filter under the encountered conditions. This medium is easy to remove, clean and return to a frame or matrix provided on the generator, the mere insertion of which results in an effective filter.

It will be noted that strap 23 is of sufficient width to extend over the area in which fan blades HlB rotate. This strap serves not only to protect the fan from injury, but to assist in directing air currents through openings ZIA and I8 which communicate with the interior of the generator, where the air currents are again accelerated by interior fan l9. Both fans work together toexpel air from openings 24 disposed at the other end of the generator, preferably in commutator strap 25. While these fans are of the same general structure, the blades of fan l9 have an increased pitch according to the velocity of the air, as a means of deriving the full benefit of both groups of blades which would not be the case if both sets of blades had the same pitch owing to the fact that when the air reaches blades I9 it is already well accelerated.

Operation Inasmuch as these generators are disposed under the hoods of automobiles, it was found desirable to provide means for an easy and quick removal of the filter medium that becomes laden with foreign matter, and to be able to instantly replace it with a fresh medium. Therefore the filter strap 23 is provided with a latch 23A, which is arranged to engage the eye 23B, when in place, at the other end of the strap, and thereby secure same in a permanent way and confine the medium. Therefore the latch can be sprung, strap removed, used media removed, a media replaced and strap returned, all in a very brief period of time.

It will be noted that this filter normally is in a bar form shown in. Fig. 4 and that it is radially applied to the circular filter housing and forced to take up a generally circular form. To assist in locating this strap, lip 26, which is pressed or bent out of the strap 23 as illustrated in Figs. 7 and 8, is provided and so located that it will engage the inner surface of face plate 2! and thereby prevent the strap from displacement.

M o difi cation The strap 30 shown in Fig. 9 is made with depending walls 3|, 32, the object being to suitably attach filter media to the strap and to further increase the facilities with which the filter can be changed. It will be noted that depending wall is arranged to fit into groove 33 of end housing I! Which serves to lock and secure the filter.

Scope With the object of this invention and the structure of the means for accomplishing same having been disclosed, many further modifications, substitutions or eliminations can be indulged and the means for accomplishing same can be varied without departing from the spirit of this invention, therefore I do not wish to be limited to the specific forms shown and described, and desire to be limited only by the appended claims.

I claim:

1. In a dynamo-electric machine having an enclosing housing with an outlet at one end and an inlet at the other end, a shaft mounted in bearings carried by said ends, a fan carried by said shaft and cooperating with the inlet to force air through said housing via the inlet and the outlet, aremovable filter medium associated with said inlet, a fixed frame for said medium, and a detachable band encompassing said frame and extended to embrace at least a portion of said fan.

2. In a dynamo-electric machine having an enclosing housing with an outlet at one end and an inlet at the other end, a shaft mounted in bearings carried by said ends, a fan carried by said shaft and cooperating with the inlet to force air through said housing via the inlet and the outlet, and a removable filter medium associated with said inlet, a fixed frame for said medium, said frame being disposed between the fan and the inlet and a detachable band encompassing said frame and longitudinally extended to embrace at least a portion of said fan.

3. In a dynamo-electric machine having an enclosing housing with an outlet at one end and an inlet at the other end, a shaft mounted in bearings carried by said ends, a fan carried by said shaft and cooperating with the inlet to force air through said housing via the inlet and the outlet, a removable filter medium associated with said inlet, a fixed frame for said medium, said frame comprising a pair of discal juxtapositioned members and a detachable band encompassing said frame.

4. In a dynamo-electric machine having an enclosing housing with an outlet at one end and an inlet at the other end, a shaft mounted in bearings carried by said ends, a fan carried by said shaft and cooperating with the inlet to force air through said housing via the inlet and the outlet, a removable filter medium associated with said inlet, a fixed frame for said medium, said frame comprising a pair of discal juxtapositioned members and a. detachable band encompassing said frame and extended toembrace at least a portion of said fan.

LOUIS A. KOCH, JR.

Images