US40482A - Improvement in blowers - Google Patents

Description

'Ntra raras BENNET HOTGHKISS, OF NEW HAVEN, CONNECTICUT.

IMPROVEMENT IN BLovvEFts.

Specification forming part of Letters Patent No. 110,482, dat-cd November 3, 18652.

To (all whom it may concern:

Beit known that l, BENNET IIOTCHKISS, of the city and county of New Haven and State ot' ConnecticutJ have invented new and useful Improvements in Fan-Blowers; and I do hereby declare the following to be a full, clear, and cXact description 'ot' the construe tion and operation of the same when taken in connection with the accompanying drawings, which form part of this specification, in which- Figure 1f is a side view. Fig. 2 is a longitudinal section. Fig. 3 is a transverse section.

Sameletters of reference indicate like parts.

In the common fan-blower the blades or fans are large and never exceeding six in number, usually three rfour. '.lhe airis drawn through openings in both sides of the shell or case, and discharged from an opening tangential to the circle described by the blades. In this manner of receiving and discharging the'air by the use of such large blades lthe air forced before them (the blades) when re'- leased from the direct action of the blades, as it is when the blade passes the outlet, rebounds and is struck by, the air before the next blade and produces a concussion, the rapid succession of' which occasions the unpleasant noise always attending the use of such blowers. the rotation of the air nearly around the case, consumes no small proportion of the power required to maintain the blast. i

The object oi' my invention, therefore, is to produce a blower requiring much less power than the common blower, and at the same time noiseless in-its operation.

It consists in .an outward shell or case within which, upon ,an axis, I hang two wheels placed the required distance apart, (according to the size of the blower, 1 prefer about onefourth the diameter of the wheels). In the rims of these two wheels, and extending from the rim of one wheel to the rim of the other, I set and 'tix blades not exceeding in width onetwentieth the diameter of the wheels, and placed at a little distance apart, as more fully set forth hereinafter. I make the blades slightly convex upon one side and set them so that'the convex side will be inclined outward iroxn lthe wheel, the wheels to revolve in a direction opposite to the inclination of the This concussion, together with blades. The result is that air is drawn' in through the center of the wheels to supply the vacuum occasioned by the revolution 0 the blades. The air passes from within the wheel outbetween the many blades into an air-chamber, and, owing to the peculiar form where the blast is required.

To enable others skilled in the art to make and use my improved blower, I will proceed to describe its construction and operation.

A is the shell or caseinclosing the fan, and also forms the air-chamber.

. B B are two wheels,1xed to an agile, C, which is made to revolvein bearings D D.

a a are .blades fixed, one end into rim of each of the two wheels B B. I make these blades from thin sheet metalcurved, as shown in Fig. 2, and set so that the convex side will face in the direction in which the wheel revolves, and inclined 'in the opposite direction, as shown in Fig. 2. t

E is the driving-pulley fixed tothe arbor (J. F are openings through the side of the shell to admit air to supply the blast.

H is the air chamber; 1, the outlet. l place 'a partition, L, within the ease, (see Pig. 3,)

and between the fan and outlet, to form apassage from the air-chamber to the outlet. Red arrows denote the currents of air. When power is applied and the fans or blades revolving, the air which is before them isthrown o" and a fresh supply drawn through the inlet. The air thusthrown oit' is forced into the air= chamber and through the outlet to the conductors. 'Ihe nearer together the floats or blades are Vplaced the narrower they may be, (but the width before mentioned experiments have4 proved'to be about right, provided, however, that they be so wide that a line drawn at' right angles with and' over one blade will strike the next bladeback above its lower edge, as-shown inFig.- 2, and but little more than this width must be used else the air will be rotated with the blades. flu this manner a constant and steady draft is kept up between all the blades.; consequently` there cannot be rebound or concussion ofthe mow` -ing or compressed ar,wthoiit which there can be no noise, asbefore shown, and the object of myinvention fully accomplished an assertion warranted by numerous practical experimentsrproving the theory of my invention-as herein set forth to be practically correct,

Therefore, having fully Eet/forth my inven tion, I do not broadly claim e curved "olado for fan-blowers, as such is not new; but

Whatl claim as of my invention, end new and useful, and desire to secure by Letters latent,is i Y The blades a a when the Same are of the form and set relatively to each other iu the manner described, and combined with an airol1 amber, H, inlets F, and outlet I, substantially ausland for the purpose specified.

BENNE'IHOTCHKISS. Witnesses: v

JOHN E EARIE,

IRUFUS SANFon'

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