US912549A - Rotary blower. - Google Patents

Description

L. E. FAGALL. ROTARY BLOWER! APPLICATION FILED MAR. 12, 1908.

m Z 2 ,W W/ An 9 z 7 m A E w i m J n M2 w y W m F a; a X m M fi 2 0 1 m v I/ w: MW?! m H w a L. E. FAGAN. ROTARY BLOWER. APPLICATION rILEi) MAB. 1 1908.

Patented Feb. 16, 1909.

2 sums-sum 2 W z'fnasses:

' LEWIS FAGAN, F MINNEAPOLIS, MINNESOTA.

' ROTARY BLOWER.

To all whom it may concern:

Be it known that .I, LEWIS E. FAGAN, a

' citizen of the United States, residing at Minneapolis, in the county of Henn epin and State of Minnesota, have invented certain new and useful Improvements iii/Rotary Blowers, of which the following is a specification.

' My invention relates to rotary blowers,

and particularly to such as embody two or more intersecting cylindrical casing members one of which contains a fixed core and a driving-shaft carrying impellers which revolve in an annular space between the core and casing, and the other of which contains a rotating cylindrical drum or idler provided with longitudinal recesses for receiving the revolving impeller blades during their return movements to the suction side of the casing.

My improvement relates to the provision of means whereby at the proper times the air under pressure carried in the idler recesses in approaching the suction side of the blower is enabled to flow through passage-ways in the core of the first named casing member to the spaces between the impeller blades at the Working side, instead of being carried to the suction port, thereby effecting a saving of air under fpressure as well as preventing the noise 0 its escape at the suction side.

My improvements are illustrated in the accompanying drawings, in which Flgure 1 is a transverse section of the preferred construction-of my improved rotary blower taken on the plane of the broken line w-w of Fig. 2;Fig. 2 is a longitudinal section of the machine on the plane of the broken line 'x:v of Fig. 1;Fig. 3 1s a like section on the plane of the broken line z-z of Fig. 2; Fig. 4 is a transverse section, similar to Fig. 1, of a modified construction in which is employed a single idler instead of a plurality of idlers; Fig. 5 is a top view of the core detached; Fig. 6 shows an end view of the core and showing also the disk and impeller blades; Fig. 7 shows portions of the upper cylindrical segments am the plates and flange for filling the grooves in the idlers and the space between them; and Fig. 8 is a perspective view of one of the idlers.

In Figs. 1 to 3 the casing is shown as consisting of three intersecting cylindrical segments designated, respectively, 1,2, and 3, which have their respective ends closed by heads 4 and 5, which are fixed in place and, in part, constitute the supports for the ma- Specification of Letters Patent.

Application filed March 12, 1908.

' Patented Feb. 16, 1909.

Serial No. 420,633.

chine. The heads 4 of the lower and larger casing member 1 have outwardly extending projections 6 that provide the journal-boxes or a driving-shaft 7; and these heads are also provided with inwardly projecting cylindrical cores 8 having axial openings which in rnish interior bearings for the six aft. Between the inner ends of the cores is aspace sufficient to permit the free rotation of, a disk 9 formed on a hub 10 that is secured to the shaft 7 at the center of the casing member 1. The impeller blades, of which there may be five as snown 1n Figs. 1 to 3, or any other suitable number, are designated 11, 12, 13,14,

and 15, and are formed on or attached to the d1sk 9 and extend from its sides in directions parallel with the shaft 7; and the blades, be-

ing equally spaced, divide the annular space I 16 between the cores and easing into a like number of equal spaces or pockets. The upper surfaces of the cores 8 are provided with grooves 17 and 18, curved in cross-section and extending longitudinally of the cores at opposite sides of the vertical plane of their common axis. From the groove 17 of each core a slot or passage-way 19 extends through the core to its lower surface at the same side of the vertical lane; and fromthe groove 18 of each core a 0t or passage-dry 20 extends through the core at that side of the axis to the lower surface, and in communication with the passage-Way 20 is a port or opening '21 to the annular space intermediate the grooves 17 and 18.

The heads 5 of the casing members 2 and 3 are provided with journal-boxes 22 for the axles 23 and 24-of the idlers 25 and 26 that are rotated by gearing (not shown) connecting the axles. with the driving-shaft 7. The two idlers are of like form and size and comprise three longitudinal hollow vanes or blades 27 the peripheries of which constitute arcs of a circle, and the recesses 28 of which are preferably nearly circular. These idlers may each be formed of two sections or be provided with a circular groove 29 extending from the axle to the periphery. They are geared to revolve in the same direction and, like the impeller, may be rotated either toward the right or left. For the purposes of illustration the impeller is assumed to revolve in the direction indicated by the arrow a and the idlers in that indicated by the arrow 6.

The drums arefplaccd to revolve respectively in the core grooves 17 and 1S, and the outlet -tered with the passage-way disk 9 is free to rotate in the lower portions l of the circumferential grooves 29. The up er ortions of the latter grooves are partia y (ilosed by plates 30 that are secured to the casings, and a downwardly extending flange 31 at the point of juncture of the casings 2 and 3 fills in the space of the grooves 29 intermediate that filled bythe plates 30. The plates 30 and flange 31 serve to steady and guide the idlers in their rotary movements. p

The casing has the usual inlet or suction openin 32 at one side and discharge opening 33 at t 1e opposite side, and Su located as to be in communication successively with the spaces between airs of impeller blades and with the drum 0 iambers 28.

and 12-13, while an is flowing in through the inlet 32 to the space between the blades 15 and 11, and air is being discharged from the space intervening the blades 13-14 against the pressure of' the air in the, outlet opening 33. Just before the parts have ro' tated to the positions shown in Fig. 1 the chamber 28 of the idler 25 in which the blade 14 appears, was in communication with the ort an? hence received a charge of air un er pressure which the idler carried along until the opening to the chamber 28 registered with the opening to the passageway 19 which permitted a portion oi the compressed air in the chamber 28 to flow throu h the core 8 to the space between the impeller blades 12 and 13. The rotation to the position shown in Fig. 1 also carried along air under pressure in the space be-.

tween the blades 14 and 15 which, when the blade 15 had passed the port 21 leading to the passa e-way 20, was permitted to flow.

through t e core to the space between the blades 11 and 12. Just before the chamber 28 of the idler 26, in which appears the blade 15 in Fig. 1, reached the position shown, it was in communication with the spac between the blades 1.4 and 15 and received a charge of air under pressure which, during the time the opening to the chamber regiswas per mitted to flow through the core to the space between the blades 12 and 13. By this arrangement of devices nearly all of the air under pressure that is not discharged at the outlet is preventeo from being carried back to the suction side and is saved by being permitted to return to the annular space 16 to be again carried by the impeller to the discharge outlet.

In the construction illustrated by Fig. 4 only one idler is employed, and the other parts are varied only suflieiently to adapt them to such modification. The cores 8, instead of having each two longitudinal grooves, have each only one groove, 3-1,

which is arranged centrally over the shaft 7 and each core has but one air passage-u ay 35 through its body. The impeller in this instance is shown as having but three blades, designated '11, 1.2; and 13, to correspond with the, three-varied idler. The parts in this construction that are like those heretofore described are indicated by like reference numerals. It is believed that the mode of operation \& ill be apparent in the light ol" the description hereinbefore g ven.

For supplying air at the hi her n'essures tne construction showing the arger number of impeller blades and a lurality of idlers is preferable; but for the owe-r pressures the modified construction, with fewer impeller blades and a single idler, is a desirable form of machine.

Having described my invention, what I claim and desire to secure by Letters Patent is v i 1. In a rotary blower, a casing, stationary cores therein providing an intermediate. annular space and having lon itudinal grooves in their surfaces, impeller blades arranged to revolve in such annular space, and longitudinally recessed idler blades ar anged to revolve in said core grooves, the cores being n ovided with air ducts extending transversely through the core bodies and connect-- ing said surface grooves at the one side with the annular space at the opposite side, substantially as set forth.

2. In a rotary blower, a casing, stationary cores therein providing an intermediate annular space and having longitudinal surface grooves and transverse airducts connecting such grooves with the annular air space at the opposite side of the cores, impeller blades arranged t-o'revolve insaid annular space, and longitudinally recessed idler blades arranged to revolve in the core grooves, substantially as set forth.

3. In a rotary blower, a casing, stationary cores therein providing an intermediate annula space and having longitudinal surface grooves and transverse air ducts connecting such grooves with the annular air space at the opposite side of the cores, a disk arran ed to rotate between the core ends, impeler blades carried by the disk and operating in the annular space, and longitudinally recesse'd idler blades arranged to revolve in the core grooves, the said air ducts being arranged to permit the passage of air under pressure from the core grooves to the space between impeller blades at the opposite side, substantially as set forth.

4. A rotary blower, comprising a casing, stationary cores therein having longitudinal surface grooves and transverse air ducts connecting such grooves with the annular air space at the opposite side of the cores, a disk arran ed to rotate between the core ends, im e er blades carried thereon, andlongitu ally recessed idler blades arranged to revolve in the core grooves, for the purpose set forth.

5. A rotary blower, comprising a casing, stationary cores therein having longitudinal surface grooves and transverse air ducts connecting such grooves with the annular air,. space at the opposite slde of the cores, a disk arranlged to rotate between the core ends, impe er blades carried by the disk and operating in the annular space, and a plurality of idlers arranged to rotate in said grooves and having longitudinal recesses, substanbetween the adjacent ends of the cores, im-

peller blades carried thereon, and suitably core grooves, substantially as set forth.

7. A rotary blower comprising a casing formed by intersecting cylindrical segments and heads, cores supported by the heads of one of the fiylinders and provided with longitudinal gr' oves along their surfaces and air ducts extending transversely through the core bodies from said grooves and from an intermediate point to the opposite annular space, rotating impeller blades, and idlers arranged to rotate in said grooves and having longitudinal recesses, substantially as set 'forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses this 10th day of March, 1908.

LEWIS E. FAGAN.

Witnesses:

P. H. GUNOKEL, H. A. BOWMAN.

chambered idlers arranged to rotate in said

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