US2347839A - Impeller - Google Patents

Description

May 2, 1944.

IMPELLER Filed Oct. 4. 1945 W. A. NORRIS 2,347,839

Patented May 2, 1944 UNETED STATES PATENT OFFICE IMPE-LLER William A. Norris, Alhambra, Calif, v Application ()ctober 4, 1943, Serial N6. 504,832 4Claims. (01. 170-159) This invention relates to an air impeller.

The general object of the invention is to provide an improved multiple bladed impeller.

A more specific object of the invention is to provide an air impeller including novel blade members.

A further object of my invention is to provide an air impeller including a novel arrangement of impeller blades and a novel reenforcement for the blades.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing, wherein:

Fig. l is a side elevation showing my new impeller;

Fig. 2 is a front view of the impeller, and

Fig. 3 is a section taken on line 3-3, Fig. 2.

Referring to the drawing by reference characters, I have shown my invention as embodied in an air impeller which is indicated generally at Iii. The impeller is shown as comprising a disc H and a plurality of vanes or blades 12.

The disc II has a hub member l3 thereon. The hub member may be secured in place as by bolts it. The hub member is held on a shaft'of a motor I5 by means of a screw it. It will be understood, however, that the particular manner in which my impeller is shown as mounted is for purposes of illustration only and that the impeller is adapted for a wide number of uses.

In the disclosure the impeller includes eight blades. Each blade is made from a blank which includes a vane forming portion l1 and a projecting portio I 8. The outer ends IQ of the vanes and the inner ends 29 of the vanes are perpendicular to the leading edges 2| and the trailing edges 22 of the vanes. The projecting portions are shown as secured to the disc H as by rivets 23. The projecting portions as well as the vane portions themselves are arcuate in cross section throughout their entire width, as best shown in Fig. l.

The inner free edges of the vanes are secured to an annular washer-like member 24 as by rivets 25. The member 24 has an outside diameter which is greater than the outside diameter of the disc H as shown in Fig. 2 and the hole 21 in the member 24 is of such diameter that it substantially aligns with the corners formed by the leading edges of the blades and the inner ends of the blades. This leaves a portion 26 on each blade which is exposed within the inner hole 21. As a result of this construction when the impeller is rotated air is forced in the direction of the arrow in Fig. 1 by the outer end portions of the blades. Also, air is taken into the central aperture whence it passes radially and then rearwardly.

The present invention is an improvement on the construction shown in my application Serial No. 420,361 filed November 25, 1941. The present invention differs from the disclosure in said application in that the present vanes are curved throughout their entire width. This forms air pockets of maximum capacity and thus the volume of air discharged is increased over that shown in my prior application. Further, in the present application the disc member 24 has an outer diameter which exceeds that of the disc ll while in my prior application the disc memher is of much smaller area and does not have the efficiency of the present construction. Further, the present construction provides the inner aperture 21 in the disc 24 of the diameter so that it intersects the corner of the blades while in the prior application the diameter of the aperture in the disc member is such that a portion of the edge of each blade is exposed. Thus the new construction provides a better passageway for air passing through the disc member aperture.

From the foregoing description it will be apparent that I have invented a novel impeller which can be economically manufactured and which is highly efficient for its intended purpose.

Having thus described my invention, I claim:

1. An air impeller comprising a disc member adapted to be secured to a shaft, a plurality of impeller blades mounted on said disc member, each of said blades including a body portion which forms a vane, each of said body portions having a projection thereon, the projections being secured to the disc member, and an annular member arranged upon the body portions of the blades and secured to the edge portions thereof, the center portion of said annular member being open to provide a path for the column of air being moved by the vane members, the outer diameter of the annular member being greater than the diameter of said disc.

2. An air impeller comprising a disc member adapted to be secured to a shaft, a plurality of impeller blades mounted on said 'disc member, each of said blades including a body portion which forms a vane, each of said body portions having a projection thereon, the projections being secured to the disc member, and an annular member arranged upon the body portions of the blades and secured to the edge portions thereof,

ing secured to the disc member, each of said v blades being arcuate in cross section throughout its entire width, and an annular member ar' ranged upon the body portions of the blades and secured to the edge portions thereof, the center portion of said annular member being "open to provide a path for the column of air being moved by the vane members.

4. An air impeller comprising a disc member having a hub thereon, a plurality of impeller blades mounted on said disc member, each of said blades including a body portion which forms a vane, each of said body portions having a projectio thereon, the projections and body portions being arcuate in cross section throughout their entire width, the edge portions of the projections being secured to the disc member, said blades extending radially of the disc, and an annular member coaxial with the hub and arranged upon'and secured to the planar blade edge portions, the center of said annular member being open to provide a path'for a column of air being moved by the blades, the outer diameter of the annular member being greater than the diameter of the disc, the leading edge of

Images