US1136142A - Blower. - Google Patents

Description

C. V. KERR.

BLOWER.

APPUCAIION FILED AUG. 15. 19:3.

Patented Apr. 20, 1915.

as a number of stationary blades or vanes.

MRJLES VOLNEY KERR, 01E WELLSVILLJE, NEW YO 1:: 1..

*Btowna.

meat la.

Application filed August 15, 191 s. semi no. 785,009.

To all whom it may concern Be it known that 1, CHARLES V. KERR, a citizen of the United States, residing at Wellsville, New York, have invented a certain new and useful Blower, of which the following is a specification.

()ne object of my invention is to increase the eliiciency of blowers employed for forced draft, or ether purposes, by providing improved dififiisionl -ineans which prevent losses by eddy-currents, e More particularly, I accomplish-t result by employing, at the discharge sidebf the fan, an annular discharge nozzle, and in this nozzle I provide These blades are preferably curved so that they receive air from the fan traveling in its normal direction and discharge this air 5 radially. In effect, these blades divide the annular discharge or diffusion nozzle into a plurality of nozzles, in place of the usual volute casing, each of which is larger at the discharge end than at the inner end. Air passing into the small ends of the nozzles is thus reduced in velocity with increase of pressure so that the kinetic energy. imparted by the fan is most efficiently converted into potential energy. Air is discharged from the circular, vaned difl'user into an inclosed space such as the stokehole of a vessel for example, and the combination specified is especially adapted to maintain suitable pressure in such an. inclosure in an efiicient manner and without the provision of a volute casing which is frequently employed incompressors.

Another principal object of the invention is to reduce the noise of blower-fans and the like by making the number fan and the number of blades in the difl'user prime to each other. This prevents the whole number of blades in the rotor and.

- Specification of Letters Patent.

of blades in the juice to eah Patented Apr. 2 0, TQM.

plan and partly in section of half of the apparatus, and Fig. 2 is a vertical section.

Reference character ldesignates a suction passage leading through the deck 2 of a vessel, or the like; This suction passage terminates in what may-be identified as a suc.

The impeller shaft 4 suption-throat 3. ports impeller 5 within the throat. At the discharge side of the impeller is deflector 6, preferably of conoidal shape. The inner end of suction-throat 3 is curved and flanged outward, and an annular diffuser surrounding thedefiect'or is formed by plates 7 and 8 secured to the suction-throat and outer edge of the deflector, respectively. \Vithin this diffusion ring or nozzle are a plurality of vertical diffusion blades or vanes 9, and these are preferably curved, as shown in Fig. 1. The diffusion ring thus constitutes essentially a multiple volute discharge casing. Air is discharged by the fan through the space between the suction-throat and the deflector, and strikes the inner ends of the difi'usion vanes in nearly tangential lines, as indicated by the arrows, Fig. 1, and the vanes direct this air outward in radial lines, as shown. The cross-sectional area of each subordinate nozzle increases from the inlet to the outlet sides, and thus each component part of the diffusion ring forms'part of a volute casing. To reduce noise in the way above suggested, the number of blades in the fan may, for example, be thirty-one, and the number of blades in the diffuser may be thirty-two. These numbers are prime to each other, and,

* therefore, produce the desired result in re Other numbers of blades other may be chosen, but it will probably usually be desirable to make the number of blades closely approach each other, although this is not an essential limitation.

ducing noise.

M designates a suitable motor, such as a steam turbine mounted on the impeller shaft and suitably suspended. Any suitable hlghspeed motor designed to cooperate with the impeller may, of courseabe employed.

The invention is ,designed for advantageous use of an impeller of the kind described in my previous pending applications, .Serial Numbers 648,584 and 665,785,

although it is notlimited to the use ofthat form'of impeller.

operation.

I claim:

1. In a blower or the like, a bladed im- Ipeller and .a difl'user having stationary lades, and diffuser being prime to each other.

2. In a blower or the like, the combination of a rotary bladed impeller designed to move air axially, a deflector at the discharge side of the impeller, an annular diffusion ring at the periphery of the deflector, said ring being in a plane parallel to the rotative plane of the impeller, and diffusion I the fiumber of .blades in the impeller tion of a suction inlet, an impeller for moving air axially rotatably supported within said inlet, a stationary deflector at the discharge side of the impeller arranged to receive air moving axially and to deliver it spirally outward, an annular series of diffusion vanes to receive air from the deflector and deliver it radially outward, and an inclosure for containing air under pressure wherein said difi'usion vanes are located.

5. In a blower or the like, the combination of a suction inlet, an impeller rotatably mounted therein and constructed and arranged to move air spirally away from said inlet, an annular series of diffusion vanes arranged concentric with said impeller to receive air therefrom and deliver it radially outward, and an inclosed space wherein said series of diffusion vanes is mounted for containing air under pressure.

CHARLES VOLNEY KERR.

Witnesses:

CHAS. O. LIVERMORE, VOLINEY A. KERR.

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