US 2078334 A
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J. A. MARTOCELLO BLOWER April 27,1937;
5 Sheets-.Sheet 1 Filed March 28, 19,35
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BLOWER Filed March 28, 1935 5 Sheets-Shes?,v 4
lNvENToR 'Josefc NarZoceZZo ATTORNEY April 27, 1937. J. A. MARTocELLo 2,078,334
BLOWER Filed March 28, 1955 5 Sheets-Sheet 5 N/N JZ 25a T f T '0\ 4 45 iii. 8
A i 45 42 i /4 yaan J5 g 24a 45 J6 57a T Y T 45 k/Y\J INVENTOR Jose/v QJVaz'aceZZo BYQOm/af 5MM ATTORN EY Patented Apr. y27, 1937 y STATES PATENT OFFICE f 1 *I ,21178.334`
. BLOWER H Jesph A. Martocello, Philadelphia, ra. A'Application Marchas, 1935, serial No. 13,464'- 2 Claims.
My invention relates to improvements in air blowers ofthe type known as rotary blowers, and used-eitheras exhausters or blowers;
This invention particularlyrelates tomyimproved blower disclosed in application Serial No.
750,878, led by meOctober 31, 1934, for air conditioningapparatusL-d v The object of vmy invention is to increase the e'ciency of blowers and to reduce the Eibration and noise associated with such devices.
A further object is to provide a blower having helicoid impellers, operatively associated within a casing. y
-A further object is to construct a blower with a plurality of yimpellers each having helical lobes which intermesh. Said lobes are arranged so that` they will' gradually roll together throughoutthe length of the impellers as the latter revolve, thereby imparting rapid'motion to the air as itis forced from between the continuouslyconverging surfaces of the adjacent lobes as they roll together.`
A further 'object is to provide an impeller having lobes arranged spirally throughout the vlength ofthe impeller and occupying successively different radial positions throughout the length of the impeller, for distributing the weight symmetrically relatively to the axis of the impeller, and thereby eliminating pulsations and vibration at high speed of rotation.'
A further object is to provide means for reducing the end vthrust of the impellers.
A further object is to provide a blower having a casing enclosing elongated impellers and construct thec`asingwith `elongated inlet and outlet passageways. l
These together with various other novel features lof-construction and 1 larrangement of the parts, which will be more fully hereinafter described and claimed, constitute my invention.
Referring to the accompanying drawings:
Fig. 1 is a horizontal sectional view of a blower showing the impellers in plan, and embodying my invention. Fig. 2 is a vertical, longitudinal, section on line 2 2, Fig. 1. Figs. 3 and 4 are perspective views of the impellers, detached. Fig. 5 is a transverse vertical sectional view as on line 5-5, Fig. 1. Figs. 6 and '7 are transverse vertical sectional views on lines 6-6 and 1 7, respectively, Fig. 1, the casing being omitted. Fig. 8 is a vertical, central, transverse sectional view of a blower, showing another form of my invention in which the helical impellers are each provided with three lobes. Fig. 9 is an end view of the impellers shown in Fig. 8.
In the accompanying drawings, in ywhich like reference characters refer to like parts, I0 represents my improved blower, or exhauster, comprising a casing I2 formed of end members I3 and I4 and longitudinal side spacing members I5 and I6, secured tothe endmembers by fastening devices II.- The side members I5 and I6 are of seglmental formation, having inner cylindricalsurfaces. Said side members are'arranged in spaced relation to each other and form air inlet and outlet passageways I9 and 20, through the casing. Said passageways extend the length of the casing between the end members. The walls of the side members I5 and I6, defining said passageways I9 and 20 are inclined toward the center of the casing I2, as shown in Fig. 8, andinsure the unobstructed passage of air into and from the casing.
The end members I3 and I4 have bearings 22 formed thereon. Shafts'23 and 24, in the yform of stud shafts, are formed integrally with the impellers 30 and 3|. ySaid shafts are rotatably mounted in the bearings 22, located at opposite ends of the casing. Said shafts and the impellers thereon are positioned in-parallel relation toeach other and extend lengthwise in relation to the length of the casing. Enlarged circular portions 25 are integrally formed with the shafts and with the impellers and form end thrust collars.
'I'he shaft 23 is extended beyond the casing and forms means for the attachment of suitable driving means for rotating the shaft. Gear wheels 26 and 21, having helically positioned teeth 28 and 29, are secured upon the shafts 23 and 24. Said gear wheels intermesh for rotating the shaft 24 in unison with the shaft 23.
The impellers 30 and 3l are rigidly formed upon the kstud shafts 23 and 24, and'occupy the space within the casing I2 between the end members I3 and I4. Each impeller is constructed with two or more lobes. Figs. 1 to 7 show the impeller 30 formed with lobes 32 and 33, and the impeller 3| with lobes 34 and 35. The lobes of each impeller are integrally formed with central body portions 31 and 38, respectively, which portions are concaved and form recesses which are occupied successively by the lobes of the opposite impeller, as the impellers are rotated by their respective driving gears.
The lobes of the opposite impellers 3D and 3| mesh alternately when the impellers are rotated, as shown in Fig. 5, and form a continuous closure to the passage of air between the impellers. The lobes upon each impeller rotate within the cylindrical portions of the two side sections I5 and I6 of the casing and form air passageways, for carrying the air through the casing adjacent to the sections I5 and I6, as indicated by the arrows, Fig. 5.
Impellers have heretofore been constructed with the lobes extending parallel with the axis of the impellers, My invention resides in the helical formation of the impellers. The lobes are extended spirally throughout the length of the impellers and form helicoid impellers.
The lobes 32 and 33 upon the impeller 30 are pitched to form a right hand spiral and the lobes 34 and 35 upon the opposite impeller 3| are pitched to form a left hand spiral.
rows in Fig. 5, the spiral lobeslswill -intermesh and continuously coil together throughout the length of the impellers, The convolute surfacesY will form air pockets between the lobes-,ofthe opposite impellers, which pockets rapidly 'reduce in size as the lobes roll together and imparta rapid movement tothe air throughout the length of the impellers, and discharge the air through the outlet passageway 20 formed in the casing.
The impellers are rotated in the proper directions, as indicated by the arrows in Fig. 5, so'that the air pockets formed between the convolute surfaces of the lobes will open as the lobes are rotated adjacent to the inlet passageway I9 of the casing, and said pockets will close as the lobes are rotated adjacent to the outlet passageway 20 of the casing.
When the impellers are rotated rapidly the helicoid formation thereof will impart an end thrust, due to the resistance of the air, which tends to move the impellers toward the end member I3 of the casing; to counteract this end thrust, the teeth of the gear wheels 26 andA 21 are inclined in spiral directions opposite to the pitch of the impellers, thereby imparting anend thrust to the gear wheels which is opposed to the end thrust imparted by the air to the impellers. The teeth 28 of the gear wheel 26 have a left hand pitch and the lobes of the impeller 30 have a right hand pitch. The impeller 30 and the wheel 26 are rigidly mounted on the same shaft 23. The teeth 29 on the gear wheel 21, secured on the shaft 24, have a right hand pitch and the impeller 3|, also rigid with the shaft 24,V
has the lobes 34 and 35 formed with a left hand pitch. By this arrangement the end thrust of the rapidly rotating gear wheels will tend to reduce the end thrust imparted to the helical impellers.
Figs. 8 and 9 illustrate a form of helical impellers 40 and 4I, each comprising three lobes, 42 and 43 respectively. The lobes are formed upon the triangular body portions 31a. and 38a,
When the` impellers are rotated as indicated by the arand extend spirally about the axis of the impellers and extend throughout the entire length of the impellers. Said lobes 42 and 43 are rigidly mounted upon the shafts 23a and 24a and intermesh in a manner similar to the impellers having two lobes, as above described.
By constructing a blower, or exhauster, with helical impellers, a more symmetrical distribution of the Weight of the lobes is obtained, and a more perfect balancing of the rctatingparts is made possible, thus eliminating pulsations and vibration to a greatervextent than has heretofore been I possible, and insuring silence during operation.
By this construction a continuous ow of air from the blower is obtained and thereby pro- -ducing more efficient results.
The novel construction of the casing having elongated inlet and outlet passageways, which are .Y coextensve with the length of the impellers, in-
sures a full delivery of air equal to the capacity of the impellers.
Various changes in the details of constructio and the arrangement of the parts maybe made withoutdeparting from my invention,
I claim: Y
l. A blower-v comprising elongated intermeshing impellers, end casing members in which the impellers are rotatably mounted, side casing members secured between said end members and positioned in parallel relation relatively to the length of the impellers, and said side members arranged in spaced relation to each other and having inclined walls forming inlet and outlet passage` ways, co-extensive 'in width with the distance between the center lines of the impellers and coextensive in length with the length of the impellers, said inlet andoutlet passageways beingv substantially unrestricted and said outlet passageway discharging-,directly to the atmosphere.
2. A blower comprising elongated intermeshing impellers, end casing members in which the impellers are rotatably mounted with their axes positioned in spaced parallel relation to each other, semicylindrical side casing members positioned concentric with each impeller, means securing the opposite ends of the side members upon the opposite end members, and said side members having longitudinal edge Walls inclined toward the central portion of the casing and denning inlet and outlet passageways coextensive in Width with the distance between the center lines of the impellers and co-extensive in lengthv with the length of the impellers, said inlet and outlet passageways being substantially unrestricted and said outlet passageway discharging directly to the atmosphere.
JOSEPH A. MAR'rooE'LLo.