US100236A - Improvement in pressure blower-wheels - Google Patents

Description

B. F. STURTEVANT.

.Pres sure Blower Wheel.

Patented Feb. 22,- 1870.

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Letters Patent No. 100,236, dated February 22, 1870.

IMPROVEMENT IN PRESSURE BLOWER-WHEELS.-

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern: 4

,Be it known that I, B. F. STURTEVANT,'Of Jamaica Plain, in the county of Norfolk, and State of Massachusetts, have invented an Improvement; in Pressure Blower-Wheels; and I do hereby declare that the following, taken in connection with the drawings, which accompany and form part of this specification, is a description of my invention sufficient to enable those skilled in the artto practice it.

In blowers designed to deliver large quantities of air under pressure, for blowing iron furnaces and other objects, great attention has to be paid to the form and proportions of the rotary blast-wheel in or-' der to secure the maximum effect withthe minimum of power.

In blowers made by'me heretofore, under Letters Patent of the United States, which have been granted for my inventions, I have substantially the same proportion of area of inlet for the shrouded blast-wheel to the area of its outlet, that I have in the wheel in which my present invention is embodied, but in my aforesaid patented construction I have not the same inclosed cubic capacity for air between .the inlet and outlet that I have in this improved wheel, because the rings which shroud the tiin-blades in former constructions are straight in the line of a cross-section, taken diametrically through the wheel, or in other words, the shroudings are hollow conic frustra, while in my improved wheel the shrouding's are made as dishing-rings, presenting their concave surfaces toward each other, so that the cubic capacity of the wheel is increased by the amount of the outward swell or convexity of the shroudings between the in let and outlet of the wheel, thereby increasing the' reservoir of air from which the discharge takes place,

and the efi'ective action of the wheel.

Figural shows a section taken through my improved blast-wheel, in a plane at right angles toits axis, and

Figure 2 is a section taken inthe plane of the axis.

The wheel is made with three hubs and three sets of arms, the outer arms being fixed to rings a, which make the inlets to the wheel.

To the rings a the shroudings b are fixed,as well 2 as to fans 0, and the arms on the center hub are united to the inner edges Jot the fans, stays (l proceeding from each arm to the outer end of the next adjacent fan.

inner to the outer edges, and the shroudings are made similarly convex to fit upon the sides of the fans to which the shroudings are united.

Heretofore blast-wheels have been made, as indioat-ed by the dotted lines seen in fig. 2, in which oonstruction the sides of the fanswere made substantially straight from their inner to their outer edges, and the. shroudings'were made with a plain conical dishing form, or as conic frustra, instead of in the concavo-convex dishing form shown in fig. 2.

By this improvement the annular rings of space represented in fig. 2, as bounded by the dotted lines and shroudings, are added to the internal capacity of my wheel, in which air is stored, as in a reservoir, adjacent to the outlet, from which the air is forcibly delivered from the wheel.

I claim a blast-wheel, made with the dishing concave-convex shrouding, substantially as described.

B. F. STUBTEVANT.

Witnesses;

J. B. CROSBY, L. H. LATiMER.

The sides of each fan are made convex from the

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