US475302A

US475302A - Rotary blower or engine

Info

Publication number: US475302A
Authority: US
Publication date: 1892-05-24
Anticipated expiration: 1909-05-24

Description

(No Model.)

G. GROWELL.

ROTARY BLOWER OR ENGINE. No 475,302. Patented May 24, 1892.

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GILMER OROYVELL, OF BROOKLYN, NEIV YORK.

ROTARY BLOWER OR ENGINE.

' SPECIFICATION forming part of Letters Patent No. 475,302, dated May 24, 1892.

Application filed April 3, 1890. Renewed October 19, 1891- Serial No. 109,091- (No model.)

To aZZ whom it may concern.-

Be it known that I, GILMER CRoWELL, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in RotaryBlowers orEngines, of which the following is a specification.

This invention relates to that type of rotary air-blast fans, blowers, or engines wherein a rotating drum is eccentrically journaled within a stationary cylinder or case and carries a radially sliding piston having no springs, packings, or followers. In this type of blower or engine it is exceedingly difficult to obtain perfect and satisfactory results from the fact that there are points in the diameter of the stationary cylinder where both ends of the piston do not accurately fill the cylinder, in consequence of which leakage and loss of power or pressure results. For this reason a sliding piston having no springs or packings or followers and carried by a drum eccentrically journaled in a cylindrical case has never, so far as I know, been practicably used for any considerable length of time.

The objects of my invention are to avoid the above objections, to provide a novel construction whereby the radially sliding fan blades or pistons touch and accurately fit diametrically-opposite points at every part of the internal caliber of the stationary cylinder without employing springs or packings or followers, an'd to provide a novel fan blade or piston for this special type of blower or engine. To accomplish these objects, my invention involves the features of construction, the combination or arrangement of parts, and the principles of operation hereinafter described and claimed, reference being made to the accompanying drawing, in which the figure is a vertical central sectional View of sufficient of the air-blast, blower, or engine to exhibit theimprovements claimed.

In order to enable those skilled in the art to make and use my invention, I will now describe the same in detail, referring to the drawing, whereinerwise laterally adjust the cylinder in the boring mechanism and bore it on a center (indicated by the numeral 3,) which is slightly eccentric to the center 2, so that the internal caliber is thereby struck from two different centers and not more than two. This forms the internal surface with a single long crescent-shaped concavity, as at4, which vanishes at the points 5 into the true circular part 6. By this construction the diameter of the internal caliber is increased at the diametrical line '7 8, and at this point the said diameter is co-ordinate with the diameter at the diametrical line 9 10. This is essential for the perfect Working of the radially-slidin g fan or piston blades 12, carried by a rotating drum 13, j ournaled eccentrically in the stationary cylinder. As there is a positive measured distance across the cylinder on theline7 8, which is co-ordinate to the distance across the cylinder on the line 9 10, the opposite extremities ofthe fan orpiston blades 12 will in their revolution preserve accurate and close contact or fit throughout the diameter of the internal caliber without liability of leakage at any point past a blade, whereby I attain by actual demonstration twenty per cent. increased power or pressure in the working of the blower 01' engine. WVhether the fan or piston blades be driven or serve to drive is immaterial, and therefore I do not enter into further detailed illustration and explanation in this respect,

as it is not essential for the proper understanding of my improvement.

It has been proposed to strike the internal caliber of a cylinder from three different centers; but the construction has never been worked in consequence of the impossibility of obtaining fan blades or pistons that will practicably operate con j ointly therewith and avoid leakage without using spring followers or packings and the like, for the working fluid will at points in the cylinder blow past the extremities of the pistons.

The axis of the rotating drum in my construction is composed of a through-shaft 14, journaled eccentrically in the cylinder-heads, and that the fan-blades may be practically continuous in a radial line the yokes 15 each have a longitudinal slot 16, so that the shaft passes through the yokes, while the latter are free to slide back and forth. The fan-blades are rigidly secured to the opposite ends of the yokes and the extremities of the blades are convex and touch and accurately fit superficially the inside of the stationary cylinder. While the drum is journaled eccentrically in the cylinder and the internal diameter thereof is struck from two difierent centers, still the extremities of the fan-blades accurately fit the cylinder at every point in the revolution of the fan, and there is no possibility of the air or other fluid blowing past the extremity of a blade, whereby the power of the engine is enlarged and good results attained.

The method of obtaining the center 3 will be clearly understood by the following explanation: The center 3 must be on the line indicated by the numeral 17, and to obtain this line it is drawn through the center 2 to where the line 7 intersects the circle 6 at the top of the casing, as shown. This determines the angle of the line 17, and on this line at the proper distance from the center 2 the second center 3 is formed that will strike the crescent 4, whereby the distance or diameter on the line 7 8 will be the same as the distance or diameter on the line 9 10. This produces what I term a perfectly-fitted cylinder, since a definite length of fan-blade working in the eccentric drum will accurately fit the interior of the cylinder at every point.

Having thus described my invention, what I claim is 1. The combination of the stationary cylinder having its'internal caliber struck from two different centers only to form the single crescent-shaped concavity and leave the remainder of the caliber truly circular with the drum eccentricallyjournaled in the cylinder, and a fan or piston blade sliding radially and having its' opposite extremities superficially bearing against the inside of the cylinder, substantially as described.

2. The combination of the stationary cylinder having its internal caliber struck from two different centers only to form the single crescent-shaped concavity and leave the remainder of the caliber truly circular with the drum, the through-shaft journaled eccentrically in the cylinder-heads, and the slotted yokes carrying the fan or piston blades and sliding on the shaft, with the fan or piston blades having their extremities in superficial contact with the internal caliber described, substantially as set forth.

In testimony whereof I have atlixcd my signature in presence of witnesses.

A GILMER CROWELL.

\Vitnesses:

ISAAC ROBERTS, WILLARD R. EAMES.