US1869802A - Fan blade attachment - Google Patents

Description

Allg. 2, 1932. 1 P, DQRE 1,8695802 FAN BLADE ATTACHMENT Filed July 13. 1951 y ,oy-'ZWQW hlm. gofmph Dom Patented Aug. 2, 1932 vUNITED STATES' PATENT OFFICE JOSEPH I. DORE, or HOLLAND, MICHIGAN, AssIoNon To HOLLAND FURNAOE COMPANY,

or HOLLAND, MICHIGAN, A CORPORATION OF MICHIGAN FAN BLADE ATTACHMENT Application illed July 13,

This invention relates to a fan structure and more definitely pertains to a fan located at the top Of a hot air furnace jacket to draw the air upwardly and then force the air outf wardly, thus Creating artificial circulation of the air through the system.

1t has been common practice to utilize a fan in heating systems of this character; but the type of fan utilized has been the common radial inclined blade type, with the result that the fan largely churncd the air within the jacket in which it operated and consequently the efficiency of such a fan was eX- tremely low. Now, in my type of fan, l eliminate the disadvantage just set forth7 due to the novel shape of myfan.

It will be noted that the blades on my fan are so shaped as to serve a double purpose. The blades first draw the air upwardly into the plane in which the fan is rotating and then the upper portion of the blades force the air radially of the fan. Thus I obtain a high degree of efciency.

Another advantage of my device resides in the construction of the fan itself. The curved portions of the blade are .formed of thin metal whereby they may be easily trimmed to the desired shape after they vhave been installed. This is necessary because constant-speed motors are utilized 'in driving fans of this type and hence regulation of the amount of air handled by the fan must be secured by some other adjustment than the speed of the motor.

Briefly described. my invention consists of a fan of the shape disclosed revolubly mounted at the top of the warm air jacket.

The air enters into the plane of the fan.'

through a battle ring located immediately therebelow. lt will be noted that the inlet opening to tl e fan is of substantially the same diameter as the fan. This is necessary because oftentimes it is desirable to use the air system without running; the fan. and in order that the' How of air through the fan area 1931. Serial No. 550,429.

may be unimpeded a large opening is necessary. When the fan is running, the air from the furnace {iows upwardly in the usual manner and the lower edges of the blades draw this air upwardly, the entire radial lengths of the blades being effective during this Operation. After the air is drawn upwardly, the upper curved portions of the blades act in centrifugal fashion to throw the air out wardly into the outlet pipes.

The further Objects and advantages will be obvious to one skilled in the art without further description.

In the drawing i Fig. 1 is a view in cross section taken through a furnace installation equipped with my type of fan structure.

Fig. 2 isa perspective view of the fan.

Fig. 3 is an end view of Fig. 2.

Similar numerals refer to similar parts l throughout the several views.

As shown in the drawing` 10 indicates a furnace body surrounded by a furnace acket 11, this furnace jacket having a concaved top l2 and warm air outlet pipes 13 leading therefrom. The furnacel() heats the air surrounding the same and the air'rises` upwardly in the usualmanner. l

A bathe ring 15 is fastened to the jacket 11 below the outlet pipe 13 and this baffle ring guides the air slightly inwardly, whereby the fan will operate thereon and prevent back eddies from occurring.

A bearing member 16 is rigidly mounted upon the conical portion 12 of the jacket, and a shaft 17, having a driving pulley 18, is rotatively mounted in the bearing member 16. This shaft extends downwardly and supports the fan.

Referring particularly to Figs. 1 and 2, 20

indicates the hub of the fan, this hub having a hole 2l therethrough for receiving the shaft 17and rigidly attaching the shaft 17 to the fan by means of the disk 19. Thus, the rotation of the driving pulley 18 causes the fan to revolve. Inclined radial blades or vanes 22 are integrally formed with the hub 20 and extend outwardly therefrom. Each of these blades 22 has a scoop member 23 rigidly attached thereto by means of the bolts 24. The members 23 are preferably formed of a light sheet metal whereby they may be readily trimmed or cut to the desired shape after their installation. As previously set forth, this is necessary, in order to regulate the amount of air thrown thereby. The outer ends of the scoops are of considerable greater width than the inner portions because the air handled by the scoops increases as the outer edge thereof is approached. In other words the air passing upwardly from the furnace l() is acted upon along the entire lower edge of the blades 22 and then the scoops 23 force the same outwardly and the volume of the air is increased as the outer edges of the scoops are approached. This will be readily understood by those skilled in this art.

reciated that I have created a fan which 1s particularly effective in combination with a jacket of the character described. That is, the inletto the fan is of substantially the same size as the fan itself and consequently the fan must be of such a. design as to act upon a volume of air passing through the large inlet opening. Furthermore, the fan must then act upon the'air to divert or force the same outwardly without churning the air with a large loss in eiciency. Moreover, the system will operate when the fan is station- 5Irlavng thus revealed my invention, I claim as new and desire to secure the following combinations and elements by Letters Fatent of the United States.

I claim:

1. In a device of the class described, a cylindrical, jacket having a closed end and a lateral outlet near said closedl end, a fan rotatable on an axis substantially coincident with the axis of said cylindrical shell, said fan consisting of a dat hub portion, two blades extending radially from said hub portion at opposite Vangles thereto, said blades being attached to the flat hub portion, a scoop member detachably fastened to each blade parallel to but spaced from the forward edge of the respective blade, said scoop member curving upwardly and rearwardly from said blade for the purpose described.

2. A combination of elements as set forth in claim l but further characterized by the fact that the scoop members are of greatest depth near their outer edges and taper inwardly therefrom.

In combination, a fan comprising a fiat rectangular strip of metal bent to form a Hat hub intermediate its ends and two oppositely inclined blades at its ends, said blades and hub being connected by short portions, a scoop member detachably mounted. upon either blade rearwardly from its leading edge, said scoop members being of relatively light material and curving upwardly and of greater depth at their outer ends for the purpose described.

In testimony whereof I aix my signature.

JOSEPH P. DORE.

From the above description it will be ap` Y

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