US3447739A

US3447739A - Fan

Info

Publication number: US3447739A
Application number: US620923A
Authority: US
Inventors: Jack F Hodder; Raphael D Schilz
Original assignee: JACK F HODDER; RAPHAEL D SCHILZ
Current assignee: JACK F HODDER; RAPHAEL D SCHILZ
Priority date: 1967-03-06
Filing date: 1967-03-06
Publication date: 1969-06-03
Anticipated expiration: 1986-06-03

Description

June 3, 1969 F, HOUDER ET AL 3,447,739

FAN

Filed March 6, 1967 Huw INVENTOR. JACK F. HoDDER. RAPHAEL n. scp-"Lz,

AN Jack F. Hodder, 803 3rd St. NW.,

United States Patent() and Raphael D. Schilz, 429 1st Drive NE., both of New Philadelphia, Ohio 44663 Filed Mar. 6, 1967, Ser. No. 620,923 Int. Cl. F04d 25/06, 25/08, 29/26 U.S. Cl. 230--117 3 Claims ABSTRACT OF THE DISCLOSURE A power driven fan including an inner tubular member adapted to be mounted on a non-rotating shaft, an outer tubular member spaced from the inne-r member land rotatable therea'bout, and .a plurality of radially, outwardly extending, circumferentially spaced blades fixed to a peripheral portion of the outer member.

The fan of the present invention comprises -a tubular inner member, a tubular outer member spaced from the inner member and supported for rotation t'hereabout, and a plurality of outwardly extending, circ-umferentially spaced blades fixed about an outer peripheral portion of the outer member.

Various advantages will become apparent upon considering the following description and drawings in which:

IFIG. 1 is an end view in elevation of a fan embodying the present invention with 'a portion of the fan cut out to show details of construction of vthe blades of such fan;

IFIG. 2 is a side elevational view of the fan of FIG. 1 partially in sect-ion to show further details of construction. y

Referring now to the drawings the fan embodying the present invent-ion is generally referred to by numeral and includes a tubular rigid inner member 12 having a generally cylindrical opening 13, wh-ich member 12 iucludes a forward portion 14, an intermediate portion 15, and a rearward portion 16. Forward portion 14 is generally cylindrical in shape and extends longitudinally rea-rwardly from the front end 22 of inner member 12 to .a radially outwardly extending annu-lar l-ip 18 having a transversely extending Iforward face 18a and a generally parallel transversely extending rearward face 18h. The intermediate port-ion 15 of inne-r member 12 is generally cylindrically shaped and extends longitudinally rearwardly from t-he rearward face 18b of Elip 18 and is slightly smaller in diameter than forward portion 14. The rea-rward portion 16 of -inner member 12 extends from the rear end of inner member 12 to the intermediate portion 15, which rearward portion is cylindrically shaped and of :a smaller diameter than intermediate portion 15 and 'accordingly defines an lannular .shoulder 19 with intermediate portion 15. The forward portion 14 of inner member 12 has la circumferential slot 21 extending radially inwardly from the outer surface thereof radjacent the `front end 22 of inner member 12.

The f-an 10 also include-s a tubular rigid outer member 24 which outer member has a longitudinal centerline coaxial with the centerline of inner mem'ber 12 when such members are :assembled with respect to one another. Outer member 24 has a rearward portion 26 and a forward portion 28. Rearward portion 26 has a generally cylindrical outer surface 30 extending longitudinally forward-ly from the rear end 31 of the outer member l24 to the forward portion 28. The rear end 31 of outer member 24 lies in a pl-ane normal 'to the longitudinal center line of outer member 24 which plane is disposed rearwardly of the rear end of inner member 12. The rearward portion 26 of member 24 also includes 'a generally cylindrical inner surface 32 extending longitudinally forwardly to an annular shoulder 33. The forward portion 28 of outer member 24 has an outer surface 3S which tapers smoothly from the rearward portion 26 to the forward end y36 `of outer member 24. The forward portion 28 of outer mem-ber 24 also includes an inner surface 37 extending from shoulder I33 which inner surface 37 has a short cylindrically shaped section 38 extending longitudinally forwardly to .a forward tapering section 39 which tapering sect-ion terminates at -an inward-ly directed circumferential lip 40 lhaving a transversely extendingn rear face 40a `and :a generally parallel transversely extending forward face 4Gb. A generally cylindrically shaped section 41 extends Ilongitudinally forwardly `from the forward face 40b of lip 40 to the front end 43 of outer member 24. Cylindrical section 41 has .a circumtferential slot 44 in .the wall thereof which slot 44 is disposed nearer t-he front end l43 of outer member 24 then to lip 40.

A plurality of :airfoil shaped blades 50 are suitably fixed to the forward porti-on 28 Iof outer member 24, which 'blades 50 extend vradially outwardly and rare uniformly spaced about the periphery of forward portion 28. The leading edge 51 of each blade 50y is :disposed adjacent the forward end 36 of outer member 24 with the hubs 52 0f each blade 50 being tapered the same amount as the taper of the Iforward portion 28. A rigid Itubular shroud 55 having ya gener-ally cylindrically shaped inner surface 56 is suitably iixed lto Ithe tips 53 of the blades 50. Shroud 55 has 'a generally cylindrically shaped rearward outer portion 57 and 1a forward outer portion 58 formed of circumferentially extending longitudinally spaced sharp crested ridges 59, which ridges Iform the familiar labyrinth type of rotary seal.

When 'the inner member 12 land outer member 24 are assembled with respect `to each other the respective lips 18 rand 40 thereof lie coplranarly to and spaced from one another, and fa recess 46 is defined by inner surface 32, tapering section 39 o-f inner surface 37, rearward face 40a! of lip 40, rearward face 18b of lip 18, outer surface of intermediate portion 15 and outer surface of rearward portion 16. The inner member 12 and outer member 24 in the :assembled condition, also, `define an annular chamber 48 -between forward face 40h of lip 40, cylindrical section 41, shoulder 43, forward portion 14 of inner member 12, and forward face 18a of lip 18.

An inside-out electrical motor 61 is received in recess 46, which motor 61 has fan annular shaped stator 62 suitably xed :at its inner surface to the rearward portion 16 of inner member 12 with a part 'of the forward end of the stator 62 abutting Iwith shoulder 19. Suitably sized electrical conductors I63 are suitably fixed to stator 62 to suitably energize the stator windings of motor 61. An annular shaped rotor `ba-r 64 is fixed `at its outer surface to lthe forwardmost portion of inner surface 32 of outer member 24 with a portion of the yforward end of rotor bar 64 abutting shoulder 33.

Two identical ball bearings 66 are suitably received in chamber 48. The inner race 67 of each of the bearings 66 is suitably fixed to the surface of forward portion 14 of inner member 12 while the outer race 68 is suitably lixed to the surface of cylindrical Section 41 of outer member 24. An annular shaped wave spring 69 is also disposed in chamber 48 forwardly of the forwardmost bearing 66 with the rearward end of such spring 69 abutting the forward face of the inner race 67 of such forwardmost bearing 66. Wave spring 69 is suitably arranged with respect to the bearings 66 to apply a rearwardly directed force to the bearings 66. The wave spring 69 is prevented from moving forwardly by an annularly shaped snap ring 70 suitably disposed in slot 21 of the forward portion 14 of inner member 12. An annularly shaped retaining ring 71 is suitably disposed in slot 44 of cylindrical section 41 which ring 71 abuts the outer race 68 of the forwardmost bearing 66.

It is apparent that shroud 55 and the forwardmost portion of forward portion 28 of outer member 24 define a fluid ow passageway therebetween.

The fan described hereinbefore and illustrated in the drawings is an axial ow fan, but it should be noted, that blades can be arranged with respect to the inner member 12 and outer member 24 so that the fan of the present invention becomes either a mixed ow fan or a centrifugal llow fan. Those skilled in the fan art can readily adapt the present invention to such mixed or centrifugal flow as desired. It is to be noted that a labyrinth seal be placed on the rear end portion of the fan 10 either by forming circumferential ridges in the rearward portion 26 of outward portion 24 or by fixing a labyrinth seal member to the outer member 24.

The fan of the present invention can be mounted on a shaft and the outer member 24 rotated by motor 61 to pump a uid. A typical application of this woud be to mount the fan 10 on the shaft of a vehicle wheel wherein the fan would circulate air for cooling the brake for such wheel. Other applications will, of course, be apparent to those skilled in this particular art.

Having described the preferred embodiment of my present invention and in accordance with the patent statutes, it is to be realized that modications may be made without departing from the broad scope of the present invention. Accordingly, it is requested that the scope of this invention be not restricted to the specific form shown for the uses mentioned except to the extent indicated in the appended claims.

What is claimed:

1. A fan comprising: a hollow generally cylindrical non-rotatable support member having an inner diameter greater than the axial length thereof; an electric motor stator mounted external to and encircling a portion of the outer surface of said support member; a hollow generally cylindrical rotatable member rotatably mounted coaxally external to said support member for rotation thereabout; said rotatable member having a portion surrounding and radially outwardly spaced from said stator; an electric motor rotor mounted within and drivingly connected to said portion of said rotatable member in a location surrounding said stator; a plurality of circumferentially spaced air moving blades mounted on the exterior of said rotatable member and extending outwardly therefrom.

2. A fan comprising: a hollow generally cylindrical non-rotatable support member; an electric motor stator mounted external to and encircling a portion of the outer surface of said support member; a hollow generally cylindrical rotatable member rotatably mounted coaxially external to said support member for rotation thereabout; said rotatable member having a portion surrounding and radially outwardly spaced from said stator; an electric motor rotor mounted within and drivingly connected to said portion ot said rotatable member in a location surrounding said stator; a plurality of circumferentially spaced air moving blades mounted on the exterior of said rotatable member and extending outwardly therefrom with an air ow guiding shroud member mounted on the outer edges of said blades to encircle and rotate with said rotatable member.

3. A fan as specified in claim 1 or 2 wherein said electric motor stator includes a set of stator windings.

References Cited UNITED STATES PATENTS 1,051,852 1/1913 Treat 230-120 1,055,487 3/1913 Papin 23o-120 1,614,091 1/1927 Van Tol 230-120 2,596,783 5/ 1952 Moore. 3,175,755 3/ 1965 Rockaeld.

FOREIGN PATENTS 386,039 1/ 1933 Great Britain.

HENRY P. RADUAZO, Primary Examiner.

U.S. C1. X.R. 230-120, 134