US901337A - Disk ventilating-fan. - Google Patents

Description

D. P. GOSLINE.

DISK VENTILATING FAN.

ArPLIoATIoN FIL-Bn AUG. 24, 1905.

901,337. Patented 00120, 1908.

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D. P. GOSLINE. DISK VENTILATING FAN. urmouxon rmsn AUG. n4, 1905.

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UNITED sTATEs PATENT oEEicE.

DANIEL P. GOSLINE, OF BOSTON, MASSACHUSETTS.

DISK VENTILATING-FAN.

To all whom it may concern:

Be it known that I, DANIEL I). GosLINE, of Boston, in the county of Suffolk and State of Massachusetts, a subject of His Majesty King Edward VII, have invented a new and useful Improvement in Disk Ventilating-F ans, of which the following is a specification.

My invention relates to certain new and effective forms of the several parts and their arrangement to form a Ventilating fan which is efficient, economical and an improvement on such fans now in the market.

It consists especially in the form and shape of the blades and of the hub which is cone-shaped, and to the shape of the blades and their Inode of attachment to the rim by means of two distinct flanges turned in opposite directions. The blades are so curved as to present at alltimes to the inflowing air convex surfaces. which as they rotate draw air at the center of the small end of the cone hub. As the air in motion is accelerated the tendency of the air is to diverge from the center as the velocity increases. The dead space which would then be created is filled in my fan with the conical portion of the hub and effectually cuts off the return air currents so common and detrimental to all disk ventilating fans heretofore made.

My invention will be understood by ref erence to the drawings, in which- Figure l is a front elevation of a fan embodying my invention, Fig. 2 being a section on line 2-2 of Fig. l. Fig. 3 is a side elevation, and Fig. 4 is a plan of the templet from which the preferred form of blade is made. Fig. 5 is an enlarged section of a hub showing a modified form of construction. Fig. 6 is a perspective view of a fan embodying my invention. Y

A is the hub which may be secured to the shaft a by a key (see Fig. 2), or attached thereto by a set screw a2 (see Fig. 5). This hub is conical in shape, being larger on the rear side of the fan than on the front side.

B are ribs, each of which is substantially a segment of a circle and extends from the hub A to the rim C and are placed at angles with the shaft a. In the small sizes the hub and the ribs and rim are cast in one piece, but in the larger sizes I prefer to cast them separately. here the ribs are made separate from the hub I prefer to make each rib with a foot o in the shape of a segment of a circle, and adapted to fit into an annular recess or groove in the hub and be Specication of Letters Patent.

Application filed August 24, 1905.

Patented Oct. 20, 1908.

Serial No. 275,650.

bolted thereto, the foot being` so designed that it will conform to the shape of the hub and offer no obstruct-ion to the passage of air through the fan as it lies flush with the surface of the hub. This is a simple means of attachment but one of considerable importance as in fans of this class it is very desirable that there should be no unnecessary impeding obstacle to the passage of the air. The rim C which'defines the periphery of the fan is attached to the ribs in any desired way, preferably by riveting. To each rib is attached between the hub and the rim a blade D. I prefer to make the blades of the shape shown in Fig. 4L, from which it will appear that the body of the blade is approximately a section of an annulus bounded on two sides by approximately concentric lines (Z. The width of the blade is optional and may be diminished or increased as a volume or pressure fan is desired and the base of the blade where it joins the hub is preferably as indicated at all. The outer edge of the blade is notched as at Z2 where it engages the rim and its corner Z3 is bent forward to form one of the double peripheral flanges of the blade, and it is attached to the rim. Its front corneral"t is curved backward and also reaches and is attached to the rim and forms the second of the double peripheral fianges of the said blade. The rim therefore occupies approximately a middle position between the front and rear edges of the blade, and the front and rear outer corners are bent in opposite directions to engage the rim. In all fans of which I have knowledge the rim defines the rear edge of the fan, and hence they differ materially in this respect from my fan.v My construction enables each blade to be attached to the ribs and rim to the best advantage, a rib supporting the middle section of a blade and each corner being firmly attached to the rim.

In operation the fan is rotated in the dii rection indicated by the arrow in Fig. l, and the air passes through the fan in the direction indicated by the arrows in Fig. 3, the fan thus being run apparently backward for the best results. These points will be understood by those skilled in the art.

I have found that the tendency of the air in entering a rotating fan is to be thrown outward by centrifugal force and hence as it passes through the fan to leave a conical, neutral space, or dead center, small in the front and comparatively large in the rear,

in which there is no forward current of air, but on the contrary a rearward current is established which creat-es a back draft through the fan. The existence of this space and the consequent existence of any tendency to back draft I prevent by making the hub conical as shown, its diameter in front being such with relation to its diameter in the rear that it will substantially fill what would otherwise be the neutral space referred to and thus prevent any resulting back draft. The usual attempt to overcome this objectionable feature by using a scoop or bucketshaped blade I have entirely ignored, using for my air-moving surfaces convex blades instead ofconcave blades, my blades being set at an angle to the axis of the hub'. Tests have shown that air enters at all points along the convex edge of the blade from the center to thel periphery and gains in velocity as it is projected through the wheel by the convex surfaces, centrifugal force tending to help this action. The outer end of the blade joins the rim in two separate and distinct flanges. The front flange prevents loss of air by centrifugal discharge and thus gives direction to thev air currents and the rear flange, turned backward andy attached to the same rim, adds to the convex surface and greatly increases the effective blade area.

I have shown a modified construction in Fig. 5, in which the hub is made in two parts, the part A1 to which arecast the ribs B, and a sleeve A2 over which the part A1 is shrunk and which carries the continuation A3 of the conical hub. This hub is shown as attached to the shaft by means of aset screw a2.

What I claim as my invention is l. A Ventilating fan comprising a hub, a rim and a series of blades attached to said hub and rim at an angle to the axis of the hub and midway between the outer corners of the blade, said outer corners being turned in opposite directions and attachedV to the rim, as described.

2. A Ventilating fan comprising a hub, a

rim and a series of blades attached to said l hub and rim at an angle to the axis of the hub, said hub being conical, its greatest diameter being less than half the diameter of the fan whereby the tendency of the air to pass forward through said wheel is not checkedY while the tendency of the air to pass back through said wheel at the center is prevented, as described.

3. A Ventilating fan comprising a hub, a rim and a series of blades attached to said hub and said rim at an angle to the axis of the hub, said blades being of substan- 'tially equal width throughout their length and being longer than the radial distance from the hub to the rim, as set forth.

4. A Ventilating fan of the kind described, having a hub, a series of ribs,`a rini, anda series of blades attached to said rim, said hub being provided with means by which said ribs may be attached thereto in a manner whereby the surface of the hub may be smooth and unbroken so as to present no obstruction to the passage of air through the 7. A Ventilating fan composed ofa hub,

ribs, a rim and a series ofblades each having two flanges at its outer end bent in opposite directions and at sharp angles to the main portion of the blade and attached to the rim as described.

8. A Ventilating fan having convex surfaced blades the outer end of each of which is divided into two portions bent in opposite directions to forni peripheral' flanges, in. cornbination with a rim, said flanges being attached to said rim as described.

DANinL. r. GosLiNn.

In presence of- M. E. FLAHERTY, R. E. BREWER.

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