Патент USA US2130910код для вставки
‘1 ‘Sept. 20, 1938. ‘2,130,910 M. A. SMITH, JR FAN Filed Feb. 9, 1935 3' Sheets-Sheet l x m l my? 7.‘2A a vw 4_ :v_ _ .0 v M 43 ,JWAflmM.HlmmmG A. Z .R12.. Sept. 20, 1938. M. A. SMITH, JR v 2,130,910 FAN Filed Feb. 9,» 1935 3, Sheets-Sheet 2 mymy.M; an . INVENTOR. 6%. ” a AA n I Sept. 20, 1938. 2,130,910 M. A. SMITH, JR mm ‘ Filed Feb. 9, 19:55 3 Sheets-Sheet 3 wm nwm. lmH“Il.h" A ..0_I4.7.Z8 4T1; 2%:4. 4 9Q; aZ: W M./,.i/. / / ‘ INVENTOR. Mean/?u 6'.‘ 6/4071, d2.‘ BY g f m ATTORNEY - 2,130,910v Patented sepezo, 193s’, UNlTE'D' -. STATES" PATENT OFFl-CE ‘ '- ' 2.130.019 " ' i saith, Jnfsz‘th m, Ind., some” i?e‘ffa‘i‘mo'r'i’od??‘t ‘tmmn' south Bend’ Application February 9, 1”}, Serial No. 5,691 2 Claims. . (cl. sat-m) tion II of the ?ange 22. A bladed fan 28 is This invention relates to fans, and more partic ' ularly to‘ ventilating fans.v received over the projection ll of the hub i4, and - ' The object of the invention is to increasethe v is fixedto the ?ange 22 by any suitable means . emciency, and to decrease the manufacturing cost such as the rivets 2L 7 ~ - 5 of ventilating fans by the use of certain novel constructional features hereinafter more fully de The blades of the fan 20 are designed-to de- 5 liver air uniformly across their working length. The peripheral velocity of the portions of the ' Accordingto a preferred embodiment of the in blade closer to the hub is less than the peripheral vention, a Venturi-shaped air intake ring formed velocity of points more distantly removed from ' 10 in ‘a unique manner is employed to'produce the hub. It is therefore necessary to progres 10 smooth air?ow past a novel fan designed to pro sively increase either the angle of incidence or duce uniform air?ow over its entire working area. / the effective width of the blade as the hub is ap Other important features of the invention re proached in order to deliver a uniform quantity side in the novel means employed to fix the driv of air: ,It has been found that better results can 1‘ ing motor to the air intake ring, and to the con be accomplished by progressively increasing both \ nection between the fan and the driving. shaft of [the effective width, and-the angle of incidence of , scribed. ' , ‘ the motor. . ‘ _ the blade as the peripheral velocity of the blade ' Other'important' features of the invention will" decreases as the hub is approached. In view of be apparent from the followingdetailed descrip ‘the fact that the peripheral velocity of the por20 tion together ‘with the accompanying drawings , tions of the blade adjacent to the hub, commonly calledrthe root of the blade, is very low, it has been found impractical to attempt to employ this submitted for purposes of illustration only, and not intended to de?ne the scope of the invention, reference being had for that purpose to the sub section of the blade to drive air. _ The portion of the blade having the highest 25 In the drawings, wh’erein similar reference ‘angle of incidence is the portion of the working 25 \ characters refer to similar parts throughout the length closest to the hub. The root of the blade J'oined claims. several'views: ‘H ' - - > . _ must be su?lciently strong to withstand consid , Figure 1 is a front elevation of_ a fan embody erable bending in order that'the section of the working length of the blade closest to the hub 30 Figure 2 is a side'elevati‘on, partly‘ in section. can be carried at the necessary high angle of 80 ofthefanshowninlligure 1; incidence. The root section of the blade is there 'Figure 3 is a side elevation partly in section, of fore made of uniform cross section in order to " the hub employed to fix, the fan‘ to the driving produce uniform torsional strength so.that the motor; ' ' blade maybe easily bent or formed to the high 35 Figure} isa front elevation similar toFig'm-e 1 angles necessary at the beginning of the working ing the present invention: I ) ' but showing a‘ different embodiment of the in vention; I . . - Figure 51s a side elevation of the fan shown in 1 Figure. 3; 40' _ ‘ ~ " Figure 6 isa rear elevation, similar to Figure 3, but showing a different embodiment of ,the in vention: ‘ s section, without danger of overstressing the ma . - . ‘The fan 28 is surrounded by a Venturi-shaped air intake ring 30 designed to produce smooth air ?ow and to prevent eddies in the air before it is 40 acted upon by the propeller 28. The ring it is formed in a novel manner by t Figure 'l is a side elevation of. the fan shown in butt-welding a strip of material to form a hollow cylinder of proper diameter to form the desired Flgure 8,is an enlarged view, taken on. the line , ring, The cylinder is then passed between a pair 45 . Figure 6; and 'HofFigure'l. ‘ / - Referring to the drawings, andmore particularly to Figure 1, there is shown a ventilating fan having a driving motor [I and a driving shaft I2. 50 A hub is having two sections of reduced‘ outer diameter l6 and i8 is ?xed to the driving shaft l2 by any suitable means such as the ‘screws 20. A ?ange 22 is received over the section, II of the hub-l4. and is ?xed.) thereto by shear-riveting a ' 166 portion of‘the section it into a countersunk sec . of rolls‘ which deform it to give it ‘the proper ‘ Venturi shape. The cylinder is then removed ' from~the forming rolls and placed in a squeezer. The squeezer is so designed as to place equal pres v sure on all points about the periphery of the cyl- 50 inder. The squeezing operation is continued‘ un til the material of the cylinder is stressed beyond ‘in elastic limit, and when so stressed it will re tain its shape permanently. ' Two Venturi-shaped rings may be formed to- 55 gether channel-shaped and then split to separate members 38. The members 38 may if desired them after the squeezing operation, or one may be formed at a time, as desired. The rings may be formed of any desired material such as aluminum formedlof a single strip. bent to form a triangle having ?at ‘apexes suitable to be welded to ‘the support struts 32. In this embodiment the rein or steel. , - forcing members 38 form the'counterpart of the Hi to the ring 30. Motor support struts 32 formed motor retaining ring 33. Y ‘The design of the fan is such that the ma of seamless tubing or rectangular strip metal‘of jority of the Joints may if desired be spot welded, Means are provided to ?x, the driving motor very thin cross section, (having the dimension 10 parallel to air ?ow many times greater than the dimension perpendicular to air ?ow) are spot -weided to a retaining ring 33, ?xed tothe driv ing motor ill by the screws 35, and extend to the ring 30. The motor support struts 32 are 15 preferably spot-welded to a T-shaped member although other means may be employedto ?x 10 the members together. Although the invention has been described with . particular reference to certain speci?c embodi ments,’ it is not intended to limit the scope of the invention to the embodiments shown, nor other wise than by the terms of the following claims. 15 34 ?xed to the ring 30 in any suitable manner, as by rivets 36. The support struts 32 are so pro portioned that the dimension parallel to air ?ow is many times greater than the dimension per 20 pendicular to air ?ow. In the smaller type fans illustrated in Figures 1 and 2, four motor support struts arranged as shown in Figure 1 may be sufficient to support the driving motor l0 and the fan 26. In the larger 25 types of fans it has been found desirable to em ploy six motor support struts 32 arranged as shown in Figure 4. _ To support ‘the largest types of fans it has been found advisable to use a triangulated structure 30 as shown in Figure 6. In this structure the motor support struts 32 welded to the T-shaped mem bers. 34 form a‘ triangular-shaped framework across‘ the ring 30.‘ Reinforcing members 38 strengthen the framework and form a support to _ which the feet 40 of the motor in maybe fas I .1. A ventilating fan comprising a driving motor including a shaft and a housing, a bladed fan having a working area designed to deliver air at _ uniform velocity, a generally conical shaped air 20 ?ow directing ring and an an outlet passage of substantially the same diameter as the fan, and means including a plurality of thin relatively wide brace members ?xed to the ?anged section of the , air ?ow directing ring and extending across said 25 ring to form a generally triangular shaped frame work to receive the housing of the‘v’driving motor to hold‘ the ends of the. blades of the fan adja cent and rearwardly of the section of the ring 30 of substantially the same diameter as the fan. 2. In a ventilating fan, a ‘driving motor includ, ing a housing and a driving shaft, a hub ?xed to the driving shaft, a flange riveted to the hub, a bladed fan ?xed to the ?ange, said blades having working sections designed to deliver air at uni 35 tened by any suitable means, such'as the bolts form velocity over the working area of said blades 42. If desired' resilient washers 44 formed of and a root section of uniform cross section to resist the concentration of bending stresses derubber or other sultable'material may be inter posed between the feet'40 of the motor and the veloped in the fan, a Venturi-shaped ring sur rounding the. fan, and means including thin rel 40 40 motor support, to damp out vibration. In the devices shown in Figures 1-5 the thrust atively long supports extending across the Ven and torque of the fan 23 are transmitted through turi-shaped ring ?xed to the housing of the driv the motor retaining ring 33 to the motor support ing motor to hold the outer ends of the fan blades adjacent the restricted section of the Venturi struts 32. , _ i ' In the device shown in Figures 6 and 7 the shaped ring. ' 45 45 thrust and torque of the fan 26 are transmitted through the feet 40 bolted to the reinforcing ' MARSHALL a 5mm, JR.