US1014321A - Fan. - Google Patents

Description

D. B. MINOR.

FAN.

APPLICATION FILED D1303 1910 1,014,321, Patented Jan: 9, 1912.

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UNITED STATES PATENT OFFICE.

DANIEL B. MINOR, OF ST, PAUL, MINNESOTA, ASSIGNOR TO LESLIE S. HACKNEY, OF

ST. PAUL, MINNESOTA..

FAN.

Specification of Letters Patent.

Application filed December 3, 1910. Serial No. 595,511.,

To all whom it may concern: I

Be it known that I, DANIEL B. MINOR, of St. Paul, Ramsey county, Minnesota. have invented certain new and useful Improvements in Fans, of which the following is a specification.

My invention relates to rotary fans of the blast or suction type and the primary object of the invention is to eliminate the whirring or buzzing sound caused bythe contact. of the air with the fan blades and incidental to the operation of an ordinary fan.

A further object is to provide a fan which will be practically noiseless and adapted for use in the living roomsof the house or in oilices, stores, and other places where an ordinary fan, on account of its noise, could not beused.

The invention consists generally in providing one or more deflecting rings between the fan blades and the airintake.

In the accompanying drawings forming part of this specification, Figure 1 is a perspective view illustrating my apparatus ready for use, Fig. 2 is a detail sectional view through the fan casing and fan, Fig. 3 is a similar view taken on a sect-ion line at right anglessubstantially to the section line of Fig. 2, Fig. 4 is a detail sectional view showing the manner of mounting the deflecting rings in the fan casing.

In the drawing, (Fig. 1), I have shown two fan casings, 2 and 3, one for the intake and the other for the exhaust, with the fans therefor mounted on the same shaft and driven preferably by a motor 4 interposed between the fan casings. These casings have central openings 5, one forming a fresh air intake and the other an exhaust and said casings have trunksti and 7 communicating with suitable air ducts, one trunk directing the fresh air from one fan to the room to be ventilated and the other trunk directing the foul air into the casing to be discharged through its exhaust opening. I thus arrange 8', fresh [air and exhaust fan on the same 'shaft'and thereby effect a considerable economy in "space over what is required when the fans and casings therefor are separately or independently arranged. I have shown the interior of one casing and. this willv sufiiciently illustrate the invention, as the construction of the other fan is 'substantially the same.

8 represents a fan having radial blades 9 arranged at intervals around the periphery of the fan.

10 is a spider having a hub 11 that is securedon a shaft 12 by suitable means, said spider and shaft being concentric with the intake opening of the casing. I have found that where the air is drawn in this central opening and strikes the blades obliquely, that a whirring. or buzzing sound will result, which causes the operation of the fan to be exceedingly annoying if located inv a living room, sleeping room or ofiice. The

fan blades I have shown are of ordinary construction, corresponding to a great many fans in general use. To obviate this noise resulting from the revolution of the fan, I provide rings 13 encircled by the fan blades and at right angles substantiallyto the plane of said blades and mounted on rods 14 having sleeves or thimbles 15. There may be any suitable number of these rings, but I have shown three herein. A greater or less number may be used, however, if. preferred. The openings in the rin register with the inlet opening 5 an when the air enters this inlet opening it must-pass between the rings before coming in contact with the blades 'and these rings compel the air currents to move outwardly toward the blades in a straight line or-along the radial lines of the fan. The-result is that the air currents do not impinge upon the edges of the blades obliquely .but pass between them, following the lanes between the rings and cont-acting with the blades squarely and do not produce the humming or whirring sound usually incident to the operation of a rotary fan. The efficiency of this device I have proven by the use of the apparatus embodying the invention in full slze. I prefer to make these rings of sheet metal of suitable ga e, but any other material may be used, i preferred, and I may modify the construction of the fan and casing in various ways and still be within the scope of my invention. I have also found in the operation of an ordinary fan or blower that the currents of air striking the sharp angle in the wall of the easing at the exit will produce a sharp, whistling sound similar to a siren whistle, this sound being more marked the nearer the fan viate this ,I arrange a plate 16 within the casing 2 extending from the angle 17 in the wall to afpoint within the casing forming the chord of the arc which includes the wall of the casing between the ends of the plate.

This plate 1s preferably arranged close to the fan blades, as indicated in Fig. 2,, so that the air currents, instead of striking the sharp angle 17 and producing a whistling sound, will be drawn into the narrow space between the blades and the plate 16, with the result that the air currents will not strike the sharp corner as before and the pressure will be equalized substantially on each side of this corner and the disagree able whistling sound will be entirely eliminated. v

I claim as my invention 1. The combination, with a rotary fan havin a central air lntake, of a ring encircled by said fan blades and lying in a plane at right angles substantially to the plane of said fan.

2. The combination, with a rotary fan having a casing provided with a central air intake, of a plurality of rings encircled by the blades of said fan and lying in planes at right angles substantially to the planes I of said blades.

3. A rotary fan having a casing and a central air intake and a series 0 radial blades, a series of flat rings encircled by Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of ?atents,

said blades and spaced apart and having central openings corresponding substantially to the airintake opening, and said rings operating to direct the air currents radially into the path of said blades.

1. The combination, with a rotary fan having a central air intake and blades or vanes of uniform width substantially from end to end and a ring disposed within the space inclosed by said vanes or blades and lying in a plane at right angles substantially to the planesof said blades, for the purpose specified.

5. The combination, with a casing, of a rotary fan therein consisting of side plates and vanes 0r blades located between the outer portions of said plates, said casin having a central air intake and a periphera discharge, rods passing through said fan plates from side to side and a series of rings mounted on said rods and inclosed by said fan blades, said rings operating to d1- rect the air currents between said blades and in a direct-ion parallel substantially with the planes thereof.

In witness whereof, I have hereunto set my hand this 25th day of November 1910.

DANIEL B. MINOR.

Witnesses:

G. E. SORENSEN, C. H, REHFUSS.

' Washington, D. 0.

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