US976795A

US976795A - Centrifugal fan or pump.

Info

Publication number: US976795A
Application number: US42017908A
Authority: US
Inventors: Arthur C Fraser
Original assignee: AMERICAN BLOWER CO
Current assignee: AMERICAN BLOWER CO
Priority date: 1908-03-10
Filing date: 1908-03-10
Publication date: 1910-11-22
Anticipated expiration: 1927-11-22

Description

A. c. FRASER. GENTRIFUGAL FAN 0R PUMP. APPLICATIONv FILED HAB.. 10, 1908.

Patented Nov.22,1`910.

2 BHEBTS-BHEET 1.

LCL

FIG; 6, I I

INVENTOR .51W

WITNESSES: 47%/ 70m 41%/ A. c. FRASER. CENTBIPUGAL FAN 0B. PUMP.

APPLICATION FILED 16.13.10, 1908. I

. Patented Nov. 22 1910.D

2 Samus-SHEET 2. I

I INVENTOR 1Min/'nm' l A WITNESSES: $914 43% nutren srAtrns PATENT' ARTHUR C. FRASER, 0F NEW YORK, N. Y., ASSIGNOR, .BY MESNE ASSIGNMENTS, T0 AMERICAN BLOWER CIOMIEAIII'Y,` OF GREEN ISLAND, NEW YORK, A CORPORATION OF NEW YORK.

CENTRIFUGAL FAN -oa PUMP.

Application filed March 10, 1908. Serial No. 420,179.

To all whom it may concern:

Be it known that I, ARTHUR C. FRASER, a citizen of the Uni-ted States, residing in the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Centrifugal Fans or Pumps, of which .the following is a'speciication.

This invention relates to centrifugal fans, blowers, pumps, etc., of the multiblade drum type. Examples of centrifugal fans of this type are found in sundry patents of S. C. Davidson, notably No. 662,395, datedv November 27, 1900.

The object of the present invention is to construct the rotary member variously called the wheel, runner, or rotor of such fans or pumps so that it may be reversible, that is to say so that it may be driven in either right or left hand directiomthat is, either clockwise or counter-clockwise.

In said Patent, No. 662,395, there' is shown' in Figure 13 a form of rotar drum with radial blades (see also Patent o. 662,396) a drum of this construction is revoluble in either direction, being thus applicable to either a right-hand or-left-hand casing. The

more efficient constructions, however, are

those shown in the remaining figures of said Patent No. 662,395, wherein the oiitenedges of the blades are turned in the direction of rotation, the blades being preferably curved with their outer edges havlng a lead over their inner edges; a' rotor .thus constructed is adapted to turn in .only one direction, so that for example if builtfor a right-hand casing it is inapplicable to a left-hand casing. For some purposes it is desirable that the rotor be readily reversible; and in an event it is desirable that like rotors be rea ily applicable to either 'right-hand or lefthand casings. To suitably attain these results is the principal object of the present invention.

According to thisl invention, instead of constructing the rotor withits blades and supporting disk directly and permanently unitedv as 'heretofore I constructl the drum with two rings, pre erably precise counterparts, with the numerous blades permanentl fastened between them, land I provide or attaching either ring to the supporting disk so that the drum is reversible relatively to the disk, andv maybe turned end for end according to the direction in which it is destined to rotate, the ring thus turned toward the disk being then securely attached thereto. The attachinglmeans consists ref. erably of rivets or bolts passing throng coincidmg holes in the ring and disk; by making the holes in each ring to precisely coincide with the holes in the disk, the drum may be turned in either direction and b bringing the respective holes into coincidence, the fastenings may be put through them and the ring'anddisk thereby united. If it becomes necessary to reverse a rotor thus constructed, it is only necessary to remove the bolts or'cut the rivets uniting the drum to the disk, remove the drum and turn it end for end, and reunite its opposite ring to the disk. n

In the accompanylng drawings, F1g.l1 1s a diametrical section of a centrifugal rotor constructed according to my invent-ion; Fig.

Patented Nov. 22.1910: A

2 is a fragmentary end elevation thereof partly in section, the rotor being' mounted for lefthand (or counter-clockwise) routation; Fig. 3 is a fragmentary end elevatlon yshowing the same drum oppositely mounted,

that is, for clockwise rotation; Fig. 4 is'an enlarged fragmentar vlew Vshowmg the construction of the bla es, rlng, disk and fastening; Fig. 5is a similar View to Fig. 41, i

but showing a modified construction, and showin the drum partly separated from the disk; 4ig. 6 is a fragmentary view corresponding to Fig. 4 but showln the con struction' of Fig. 5; Fig. 7 is an e evation of a reversible fan' casing, of which Fig. 1s a side elevation partly in vertical sectlon; and Fig. 9 is an elevation of the supporting frame.

Referring first to Figs. 1 to l6 inclusive, let A designate the centrifu al rotor as a whole comprising the drum and the dlsk C, which latter has a hub C and 1s mounted on the driving shaft D in the usual manner. The drum B comprises the numerous blades a a (usually 48 to 64 in number), Vand rm s bv b between which said blades are fastene This fastening is essentially-permanent, be- 1n best made-by turnin in ears c from the ens of the blades an uniting them b rivets d to the-rin s b (Fig. 4:- The d1s C has fastening ho es e at suita 4le intervals, preferably equ1distant. The ringsl b b have coinciding holes e.

The drum being turned in either direction so that either ring b is against th'efdisk 6. The holes and the the adjoining disk b, or this may be `omit-teda The rings b b may project inwardly beyond the inner edges of the blades, as shown in Figs. 1, 2 and 4, or may project outwardly beyond the blades as shown 1n Figs. 5 and fastening devices may be located partly between the blades as shown 1, 2 and 4, or mainly exterior thereto as shown in Figs. 5 and 6.

The drum B of -this invention is essentially alike at opposite ends, and is preferably symmetrical except for the cross-sectional conformation of the blades. blades are alike at their opposite ends, and the spaces or ports between the blades `are preferably closed at both ends.

To make the reversible centrifu al rotor which forms the leading feature lo this invention fully available, it is desirable to provide a reversible casing therefor. A suitable construction of such casing is shown in Figs. 7, 8 and 9. The rotor A shown in these figures is specically of the construction shown in Figs. 5 and 6. Its shaft D turns in a bearing F formed on a bearing fram'ei and suitably supported in any desirable manner, as for examle upon a base or pedestal-H. The casing which in this instance is shown as a one-piece casting, is fastened to and supported by a frame J', which also is mounted upon an suitable sup ort such as a pedestal H, 'an which is fixe ly united to 4the bearing frame-G, either by being formed integrally therewithor by being 'bolted-thereto@ In the construction shown the sup ortin f frame J is fastened to the main she or fie d magnet casting I of an electro-motor which is mounted upon the pedestal H, but any other driving means ma be substituted.

he frame J is frmed referably with 'an annular portion or ring which in the construction shown4 is supported by cross pieces n n at intervals so as to leave an open s ace for-admittingair to the bearinos for t e purpose set forth in the patent o? C. Davidson, No. 681,389 of August 27, 1901. The ring K is made concentric with the axis ofrotation, and is constructed to t a rear flange p formed on the casing E. The casin isv made alike on bothits front and rear si es, so that its front side has a like ange Against this front ange is fastened a these fastenings may be mainly within the series of blades as shown in Figs.

The

ring L, which is flanged er bent inwardly to o'rm a contracting mouth or throatfor the admission opening or eye of the fari. The rings K and L are preferably substantial counterparts of one another, and both these rings and both the flan es p p of the casing are formed with intere angeable fastening means by which either flange of the casing may be attached to either ring. The fastening means shown consists of the usual tap-screws which enter coinciding'holesl in the respective flanges and rings. These holes are preferably equidistant, eight holes g being shownin the ring K (Fig. 9) and eight screws or bolts r bein shown in Fig. 7. This construction permits the arts to be so assembled that the casing shall ave its outlet or discharge M turned either to thc right as shown in full lines in Fig. 7, or to the left as shown in dotted lines at M. Or when assembled in either position, that is for either right or left discharge the casing may be disconnected and reassemb trary position. 4

The described construction in connection with the reversible rotor first described, thus enables any viven fan built or assembled for right-hand discharge to be easil changed at will to left-hand discharge, or vice versa. The described construction of casing also enables the discharge outlet to be directed horizontally,V vertically, or at intermediate angles for either right or left discharge. This is accomplished b turning the casing rotatively to t e desire angle and until the respective holes coincide, and then passing the fastening bolts through such holes. By the use of eight holes and bolts asshown, the casin may thus be turned for either horizonta bottom or horizontal top discharge, and either vertical upcast or vertical downcast discharge, that is to say to four different positions, and also to the intermediate positions discharging at angles of 45 degrees. As an illustration, one of these latter angles is indicated in dotted lines at M2 at the right in Fig. 7. Thus the resent construction of casing admits of t e same adjustability in direction of discharge as is provided for by the construction set forth '1n said Davidson Patent No. 681,389, this led in the con-' modifications and changes other than those set forth specifically. l Nothing is claimed in the present application which is'contained in any ,of the patjents of S. C. Davidson hereinbefore referred to, or any other patents granted to or applied for by him relating to centrifugal fans multiblade drum type, the combination with a single inlet casing of a rotor comprising an end support and a reversible drum formed with two substantially Ylike rings with numerous curved blades fastened between them, said blades arranged to inclose a large intake chamber, and said drum being adaptedv for attachment at either end to ad support for'driving to either right or 2. 4In a centrifugal fan or pump of the lnultiblade drum type, the combination with a single inlet casing of a rotor comprising a' single supporting d isk opposite said inlet and a reversible drum formed with two substantially like rings with mnnerous-curved blades fastened between them, said blades arranged to inclose a large intake chamber, and attaching means adapted for the attachment of either of said rings to said disk for driving to either right or left.

' 3. In a centrifugal fan or pump of the multiblade drum type, the combination with a single inlet casing of a rotor comprising a single supportinv disk opposite said inlet and a reversible rum formed with two like rings with numerous curved blades fastened .between them, said blades arranged to inclose a large intake chamber and having thelr outer edges turned forward, said rings having holes coinciding with holes in said disk, and fastenings engaging said holes to unite either ring to the disk whereby the drum is adapted for attachment at either end to said disk for driving to either right or left.

In witness whereof, I have hereunto signed my name in the presence of two sub scribing witnesses.

t ARTHUR C. FRASER.

- Witnesses:

DOMINGO A. USINA, FRED. WHITE.