US2279620A - Ventilator - Google Patents

Description

April 14, 1942- w. F. HlRscHMAN 'l 2,279,620

VVENTILATOR Filled Nov. 2*, 1938 2 Slieekts-Sheet l 2;\

y i 72 [L Mh y "Illu". Tip/7g A? X' i INVENTOR April 14, 1942.v W F HlRscHMAN 2,279,620

VENTILATOR Filed Nov. 2, 1938y 2 Sheetsl-Shee' 2 INVENTOR ATTORNEY Q6 25 fg if zu Patented pr. 1 4, i942 VENTILATOR William F. Hirschman, Buial, N. Y., assigner to W. F. Hirschman Co., Inc., Buffalo, N. Y., a. corporation of New York Application November 2, 1938, Serial No.A 238,433

(Cl. 23o-117) 9 Claims.

ated parts `are protected` from the impurities present in the air Withdrawn from the room, or rooms, of the building with which the ventilator communicates, this object contemplating the mounting of the motor in a vcompartment which isolates it from the said air.

A further object is to guard against entry of Water of condensation into the motor compartment.

A still further object is a ventilator in which provision is made for cooling the motor with fresh air. Y

A still further object is a novel construction and arrangement of the parts of the ventilator, whereby to achieve simplicity in design and efficiency in operation.

The invention is illustrated in the accompanying drawings in which:

- Figure 1 is a perspective view of a ventilator embodying the features of the invention;

Figure 2 is an enlarged elevational View thereof, partially in section;

Figure 3 is a horizontal section taken along line 3 3 of Figure 2;

Figure 4 is a vertical section taken along line 4 4 of the same gure;

Figure 5v is a longitudinal section throughV the motor compartment and illustrates a rnodiiiedV form of the invention;

Figure 6 isa similar section illustrating an'- other embodiment of the invention.

The ventilator, as illustrated, is, to outward appearances, of conventional design and includes a head I5, a neck II and a base I2, the latter tting over, and being suitably' secured to, a curb I3 which is formed or provided upon the roof or deck of a building. The fan by which the air is exhausted from the room, or rooms, with which the ventilator'communicates is indicated at I4.

In accordance with the invention the electricmotor I5 by Which the fan is driven is mounted in a compartment I6. The latter is provided by a rectangularly shaped housing I'IWhichv is mounted in the neck II upon angle members I8, said members supporting said housing so that it extends from one end which abuts the wall of the neck toward, and a short distance beyond, the axial center of the neck. The housing, as illustrated, comprises inner and outer shells I9 and 2i), respectively, which are spaced to provide a heat insulating chamber 2|, the latter preferably being filled with a suitable insulating material. It is understood, of course, that inthe event thatthe insulating properties of the Walls of the housing are unimportant a single 'shell construction may be employed.

The fan I4 is fixed to the upper end of a drive shaft 22, the axis of the latter preferably coinciding with that of the neck I I. The lower'end of the shaft is mounted in an upright bearing standard 23, the upper end of the shaft extending through an opening 24 formed in the top wall of the housing. The bearing standard 23 is suitably secured to a base 25. The latter, asbest shown in Figure 4, is channel-shaped in crosssection and has a plate 21 secured to one of its legs 26. The said plate provides a mounting for the motor I5, the driveV pulley 28 of the motor` being connected to a companion pulley 29 Xefd to the drive shaft 22 by a belt 30. Thefbase 25 is supported upon the bottom Wall of the compartment I 6 by the legs 26 and is secured against lengthwise movement by bolts 3|. Preferably they top Wall of the housing I'l is formed' with an' annular shoulder 32 which is adapted to prevent v'vater of condensation from entering the coipartment through the opening 24,

In order to provide for cooling of the motor' I5 an opening 33 is formed in the neck Il of the ventilator, the said opening being formed in that portion of the neck against which the open end of the housing I1 abuts and being partially closed by a door 34. The latter is formed adjacent its base with a louver 35 through which air is per-1 mitted to enterv the compartment I3. In this connection it will be noted that the opening v24v through which the drive shaft of the fan passes is large enough tok provide a substantial clearance around the said shaft, whereby to providean outlet through which air may pass from the compartment I6.

During operation of the fan I4 air is exhaustedv from the room, or rooms, with which the venti-- lator communicates, the said air passing aroundA the housing I1 and being expelled from the hood.' At the same time, owingv to suction above the' opening 24, fresh air is caused to enterv the com-` partment I6, this air owing over the motor I5v to cool it and escaping through the opening 24 to enter the main body of air passing up through the neck II. From the foregoing it will be apparent that the motor I5, belt 30 and associated parts are protected from the air bearing the dust, gases and other impurities. None of this air is permitted to enter the compartment I6 through the opening 24, owing to the higher pressure in the compartment, and the continuous stream of fresh air which is discharged through the opening during operation of the fan. Injury to the motor, fan belt and associated parts is thus prevented. The motor, however, despite its isolation from the main body of air passing through the ventilator is cooled effectively by the stream of fresh air Which is caused to flow through the compartment I6, it being noted that the motor is located in close proximity to `the louver 35 and hence receives the benet of the air while in its coolest state.

In the embodiment shown in Figure 6 the outer shell 2B of the housing II is formed with a lip 36. The latter projects above the top wall and co-operates with a disc 31 which is secured to the drive shaft 22 and which is formed with a peripheral flange 38. The said lip and'disc provide a tortuous path for the cooling air which passes through the compartment I6 and serve not-only toprevent water of condensation, which may accumulate upon the top of the housing, from entering the compartment but also to prevent entry of any such water which may drip from the interior of the hood toward the opening 24. In other respects the construction is similar to the embodiment first described.

The embodiment shown in Figure 5 is similar to that shown in Figure 6 in the respect that a lip 36 is formed around the opening 24. In this instance, however, a modified form of fan is em-vr ployed. The said fan, as illustrated, includes main blades 39 and auxiliary blades 40, all of which are carried by a central disc 4I. The latter covers the opening 24 and hence also serves to prevent water of condensation from dripping into the comparement I6. The auxiliary blades are formed, or provided, upon the under side of the disc and 'they induce a flowof fresh air through the compartment to cool the motor in the manner described. In other words the auxiliary blades supplement the action of the main blades.

In addition to the advantages above noted, the various embodiments illustrated have the further advantages that facility in assembling the parts is promoted; and simplicity in construction and economy in operation are insured.

I claim as my invention:

1. An air exhausting unit for a ventilator including a housing which is `supported horizontally in a vertical flue and which is formed with an air inlet opening in an end Wall and an air outlet opening inaJ top wall, a fan located in said flue above said housing for withdrawing air from the space with which the flue communicates, a supporting frame in said housing, a motor mounted on said frame adjacent said air inlet opening, an entrance to said housing from the exterior of said iiue through which access may be` had to said motor, a vertical shaft driven by said motor and in turn driving said fan, said s haftbeing co-axial with said flue and extending through the air outlet opening and a bearing mounted on said frame below the outlet opening in which the lower end of said shaft is rotatablyV in said housing for driving said shaft and a. cover-piece carried by said shaft exteriorly of the housing, said cover-piece overlying said air outlet to prevent entry of water through it into the housing but being spaced from the latter so that the fanA also induces a flow of air through the housing to cool said motor.

3. An air exhausting unit for a ventilator including a housing which is supported horizontally in a vertical flue and which is formed with air inlet and outlet openings, a fan located in said flue above said housing for withdrawing air from the space with which the ue communicates, a vertical shaft for driving said fan, said shaft being co-axial with said flue and extending through the air outlet opening, a motor mounted in said housing between said air inlet and outlet openings for driving said shaft and a cover-piece carried by said shaft exteriorly of the housing, saidvcover-piece overlying the outlet opening to prevent entry of water through it into the housing but being spaced from the latter so that the fan also induces a flow of air through the housing to cool said motor.

4. An air exhausting unit for a ventilator including a housing which is supported horizontally in a vertical iiue and which is formed with air inlet and outlet openings, a fan located in said iiue above said housing for withdrawing air from the space with which the flue communicates, a vertical shaft for driving said fan,said shaft being co-axial with said flue and extending through the air outlet opening, a bearing located in said housing below the air outlet opening and in which the lower end of said shaft is rotatably supported, a motor mounted in said housing between said air inlet and outlet openings for driving said shaft and a cover-piece carried by said shaft exteriorly of the housing, said cover-'piece overlying the air outlet opening to prevent entry of water through it into the housing but being spaced from the latter so that the fan also induces a ow of air through the housing to cool said motor.

5. An air exhausting unit yfor a ventilator including a housing which is supported horizontally in a vertical ue and which is formed with air inlet and outlet openings, an entrance to said housing from the exterior of saidfiue, a fan located in said yflue above said housing for withdrawing air from the space with which the flue communicates, a supporting frame in said housing, a motor mounted on said frame adjacent said air inlet opening, an entrance to said housing from the exterior of said ue through which access may be had to said motor, a vertical shaft driven by said motor and in turn driving said fan, said shaft being co-axial with said flue and extending through the air outlet opening, a bearing mounted on said frame below the air outlet opening and in which the lower end of said shaft is rotatably supported and a cover-piece carried by said'shaft exteriorly of the housing, said cover-piece overlying the air outlet opening to prevent entry of water through it into the housing but being spaced from the latter so that the fan also induces a iiow of air through the housing to cool said motor.

6. An air exhausting unit for a ventilator including a housing which is supported horizontally in a vertical nue and which is formed with air inlet and outlet openings, a fan located in said flue exteriorly of said housing, said fan having a set of large blades for withdrawing air around said housing from the space with which the iiue communicates, a Vertical shaft for driving said fan, said shaft being co-axial with said ue and extending through the air outlet opening and a motor in said housing for driving said shaft, said fan having a set of small blades which are located over and in close relation to the outlet opening so that they induce a fiow of air through the housing to cool said motor.

7. An air exhausting unit for a ventilator including a housing which is supported horizontally in a vertical i'lue and which is formed with air inlet and outlet openings, a fan located in said ilue and above said housing, said fan having a set of large blades for withdrawing air from the space with which the ue communicates, a cover-piece which overlies the air outlet opening, a vertical shaft for driving said fan, said shaft being co-axial with said flue and extending through the air outlet opening and a motor in said housing for driving said shaft, said fan having a set of small blades which are located under said cover-piece and in close relation to the outlet opening so that they induce a flow of air through the housing to cool said motor.

8. An air exhausting unit for a Ventilator including a housing which is supported horizontally in a vertical flue and which is formed with an air inlet opening in an end wall and an air outlet opening in a top wall, a fan located in said flue above said housing for withdrawing v:El

air from the space with which the flue communicates, a supporting frame in said housing, a vertical member mounted at one side of said frame at the end adjacent said air inlet opening, a motor mounted on said member and supported over said frame, said motor having a drive pulley, an entrance to said housing from the exterior of said flue through which access may be had to said motor, a vertical shaft driven by said motor and to the upper end of which said fan is fixed, said shaft being co-axial with said iiue and extending through said Iair outlet opening, a driven pulley xed to said shaft within said housing, a bearing mounted on said frame below the air outlet opening and in which the lower end of said shaft is rotatably supported, a belt connecting said driving and driven pulleys and a coverpiece fixed tor said shaft which overlies the air outlet opening to prevent entry of water through it into the housing but which is spaced from the latter so that the fan also induces a ow of air through the housingto cool said motor.

9. An air exhausting unit for a ventilator vinv from the space with which the flue communi- Cates, a shaft for driving said fan, said shaft extending through said outlet opening and axially of said ue, said fan being adapted to in. n

duce a flow of air through said compartment to cool said motor and means, which normally closes the open end of said housing and which is accessible from the exteriorof said iiue, for providing admission to said compartment to enable servicing of said motor and fan.

WILLIAM F. HIRSCHMAN.

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