US1418704A

US1418704A - Compound turbine blower

Info

Publication number: US1418704A
Application number: US460578A
Authority: US
Inventors: Edward D Green
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-04-11
Filing date: 1921-04-11
Publication date: 1922-06-06
Anticipated expiration: 1939-06-06

Description

Patented June 6, 1922 E. 0. GREEN. COMPOUND TURBINE BLOWER.

COMPOUND TURBINE BLOWER.

L41 8*, 704, Specification of Application filed April 11,

To all whom it may concern Be it known that I, EDWARD D. GREEN, a I citizen of the United States, and a resident of Chicago, Cook County, and Stateof Illinois, have invented certain new and useful Improvements in Compound Turbine Blowers, of which the following isdeclared to be a full, clear, and exact description.

This invention relates to blowers, and its principal object is to obtain a maximum pressure with a minimum expenditure of power. Ordinary fan blowers develop only a limited amount of pressure for a given size, and although positive blowers develop higher pressure, it is at the expenditure of much power. One of the objects of this invention is to obtain greater air pressure than is now possible with a fan blower, with less power than is required for driving a positive blower. lVith these and other objects and advantages in view, this invention consists in the several novel features of construction, arrangement and combination of parts, hereinafter fully set forth and claimed.

The invention is clearly illustrated in the accompanying drawing, in which 1-- Fig. "l is a central longitudinal section through a blower, embodying a simple form of the present invention; Fig. 2 is a cross section taken on line 22 of Fig. 1; Fig. 3 is a cross section taken on line.3-3 of Fig. 1; and Fig. 4: is a perspective view of one of the blades of the blower fan.

Referring to said drawing, the reference character 10 designates a blower casing, which comprises a cylindrical'wall or shell 11 and two heads or

ends

12, 18, riveted or otherwise secured thereto. Concentric with said cylindrical wall or shell, and extending through the casing, is a drive shaft 14 which is journaled in suitable bearings on or adjacent the casing. Said shaft is connected to and driven by any suitable power. mech anism, and it is here shown as coupled with Y an electric motor ll'mounted on a base 18 adjacent the fan casing. Said casing has an axially disposed air inlet opening 19 in one head 12 and a tangential air discharge opening 20 in its cylindrical wall 11., adjacent its other head 13. 7

Within the casing are a number of 'intercommunicating air chambers 21, 22, 23, 24L, in which are

fans

25, 26, that are mounted j on the drive shaft 14, each fan 25 being arsecured to the casing wall 11.

Letters Patent Patented June 6, 1922.

1921. Serial No. 460,578.

ranged to force air from the chamber in which it is located, to an adjacent chamber, and the fan 26 being arranged to discharge the air from the easing into the conduit (not shown) which conveys it to its work.

The air chambers 21,22, 23,are of greater diameter and considerably wider than the fans 25, and each chamber is made up of a transverse sidewall 21 having a central opening, and a curved end wall 21 To the edge portion of the curved end wall 21 may be secured a second side wall 21 which is also formed with a central opening registering with the central opening in an ad j acent side wall 21 The air chamber members 21, 22, 23, are secured in the casing 10 in any suitable manner, and in the drawing, I have shown them as abutting against each other, the innermost one abutting against a ring or angle iron member 11 which is Set screws 11*, threaded in the head 12 and bearing against the outermost. air chambermember, may be provided to crown the air chamber members together with the innermost one crowded against the ring 11 The air chamber 24 is contained between the innermost air chamber member 23 and head 13 of the casing, and the inlet from the air chamber 23 to the air chamber 24 is through an annular passage 24 which leads to the fan 26.

The fans lettered 25 are practically alike and a description of one will sul'lice for all. The hub portion 27 of the fan is formed with a number of spokes 28, and a circular plate orflange' 29. To said flange 29 is bolted, riveted or otherwise secured, a disc 30 and to said disc are secured a number of fan blades 31, certain of which are also secured to the spokes 28. To the edges of said fanblades,'opposite the edges which are secured to the disc 30, is secured a ring or circular centrally open disc .32, which is of greater diameter than the disc 30, and its central opening 33 is preferably of about the same area as the inlet opening 19 to the casing. The fan blades 31 extend radially from the inlet or central opening and pro ject beyond the periphery of the disc 30, to the periphery of the ring or disc 32.

Each blade is flat throughout the greater part of its length, as at 34 (see Fig. 4) and the fiat portion extends radially in a plane parallel with the shaft 14. The portions of the blades which project beyond the disc 3 are shaped to deflect the course of the air from the fan, and turn it laterally therefrom, as is indicated by the arrows thereon in Fig. 1, into the portion of the air chamber which is on the discharge side of the fan, from which it enters the adjacent air chamber. To obtain this lateral deflection of the air and to reduce the effective diameter of the fan and consequently to reduce the power required, the end portions of the fan blades, which project beyond the disc 30, are tipped back along the lateral discharge side of the fan, so as to slope back from one side of the fan to the other and their end portions are bent forward--that is, in the line of travel of the blades-thus providing concave faces on the front parts of the projecting end portions of the blades which slope back from one side of the fan to the other. Conveniently, the end portions 34: of the fan blades may be bent back along diagonal lines running from the edge of one disc to the edge of the other, and the extreme end portions 349 are bent forward, as is clearl illustrated in Fig. a.

By reason of the formation of the blades just described, air entering between the fan blades (when the blower is in operation) will be thrown outward and deflected laterally into the open space in the air chamber from which it moves at great velocity, into the fan in an adjacent air chamber, which forces it into an adjacent air chamber 23 and so on until it reaches the air chamber 24.

The fan in the air chamber 24 may be of the ordinary blower type of fan and, as shown, comprises, spaced discs 32*, 30 transverse blades 31* therebetween, and a hub 27 connected thereto. The disc 30 is solid, but the disc 32 is formed with a cen. tral opening which communicates with the adjacent air chamber 23 through the air passage 2%. Said fan 26 discharges the air out through the discharge opening 20 from which it is conveyed by the conduit to the work to be performed.

To reduce friction and end thrust upon the shaft 14, I mount the fans 25 adjacent the walls of their air chambers which contain the inlet openings, and mount the fan 26 adjacent the wall opposite the one containing the inlet opening, as is clearly i llus trated in Fig. 1. The air pressure upon the closed sides of the fans 25 is thereby counterbalanced to some extent by the air pres sure on the open side of the fan 26.

More or less variation of the exact details of construction is possible without departing from the spirit of this invention; I desire, therefore, not to limit myself to the exact form of the construction shown and described, but intend. in the following claims, to point out all of the invention disclosed herein.

I claim as new, and desire to secure by Letters Patent:

1. A blower comprising, a fan casing having an axial inlet opening and a tangential discharge opening, a shaft, and a fan thereon revoluble in said casing and comprising radially extending discs, one of which has an axial opening communicating with the inlet opening of the casing, and radial fan blades extending transversely between said discs in planes parallel with said shaft, said fan blades having end portions extending beyond the edge of one disc and thereat angularly disposed with respect to the portions of the blades within the marginal edge of said disc. 7

2. A blower comprising, a fan casing having an axial inlet opening and a tangential discharge opening, a shaft, and a fan thereon revoluble in said casing and comprising radially extending discs, one of which has an axial opening communicating with the inlet opening of the casing, and radial fan blades extending transversely between said discs in planes parallel with said shaft, said fan blades having end portions extending beyond the edge of one disc and being tilted back on oblique lines running from the edge of said disc, the extreme end portions of said blades being bent forward.

3. A blower comprising a fan casing having an axial inlet opening and a tangential discharge opening, a shaft, and a fan thereon revoluble in said casing and comprising radially extending discs, one of which has an axial opening communicating with the inlet opening of the casing, and radial fan blades extending transversely between said discs in planes parallel with said shaft, said fan blades having end portions extending beyond the edge of one disc and the side edges of said end portions of the blades at that side of the fan being concave and the faces of said end portions sloping away from said concave edges and merging into the opposite straight edges of the blades.

4. A. blower comprising a fan casinghaving an axially arranged inlet opening and a tangential discharge opening, a shaft, a fan thereon revoluble in said casing and comprising two spaced radially extending discs, one of which has an axial opening coinciding with the inlet opening of the casing, said disc being of greater diameter than the other disc, and radial fan blades secured to and extending between said discs in planes parallel with said shaft, said fan blades having end portions extending beyond the edge of the smaller disc to the edge of the larger one and being tilt-ed back on oblique lines running from the edge of one disc to the edge of another, the extreme end portions of said blades being bent forward.

A blower comprising in combination, a casing having a plurality of intercommunicating chambers, opening one into the other through axial openings, and there being a tangential discharge opening from the air chamber at one end, a drive shaft in said casing, a blower fan mounted on said shaft in one air chamber and having angularly disposed fan blade ends for discharging air laterally from the fan, and a centrifically acting blower fan in the air chamber having the tangential discharge outlet.

6. A blower comprising in combination a casing having a plurality of intercommunieating air chambers, opening one to the other through axial openings and there being a tangential discharge opening from the endmost one of said air chambers, a drive shaft in said casing, blower fans mounted on said shaft in certain of said air chambers adjacent the inlet sides thereof and having angularly disposed fan blade ends for discharging air laterally from the fans, and a centrifically acting blower fan mounted on said shaft in the chamber containing the discharge opening and adjacent the wall opposite the one containing the air inlet opening.

7. A blower comprising in combination, a casing having an air outlet chamber at one end, a plurality of other air chamber members secured in said casing at one side of said air outlet chamber, all of said chambers being intercommunicating, a drive shaft in said casing, blower fans mounted on said shaft in said air chambers, those in the chambers other than the outlet air chamber having angularly disposed fan blade ends for discharging air laterally from the fans, substantially as described.

EDWARD D. GREEN.