Патент USA US2404203код для вставки
July 16, 1946- c. F. ZlMM-ER-MANN ‘ 2,404,203‘ EXHAUSTER Filed Aug. 20, 1942 3 Sheets-Sheet 1 Ikll .70 l aw ‘.. vi . - I 1mm. J I J». ‘ , “N . J I M , . 2%"; WU.a July 16, 1946. c. F. ZIMMERMAN'N ' EXHAUSTER - 2,404,203 ’ v 3 Sheets-Sheet 2 i , w. ‘. j ___.4 I yam/1mm”: m/ . , ‘s. ' July 16, 1946. c. F. ZIMMERMANN 2,404,203 EXHAUSTER 3 sheets-sheet 3 Filed' Aug. 20, 1942 > - - @717.’ Z7 9/ 1% y 2,404.20?» Patented July 16,}‘1946 UNITED STATES PATENT OFFICE 2,404,203 EXHAUSTER Carl F.,Zimmerm'ann, Chicago, Ill., a'ssignor to Aerostream Pneumatic Conveyors, -Inc., Chi cago, 111., a corporaticnlof Illinois Application August 20, 1942, Serial No. 455,538 . 10 Claims. (01. 302-25) 1 2. The present invention relates to exhausters and an exhauster ‘of this character wherein elimina tion of erosive wear on the steam manifold is is particularly directed to improvements in ex hausters of the type wherein a fluid jet such as steam is introduced into a conduit for the purpose of establishing a vacuum in the conduit and in ' ducing ?ow of air through the conduit to enable the air stream to transport granular materials held in suspension therein. complete. It is a further purpose of the invention to pro vide in an exhauster of the character described a construction wherein the nozzles which direct steam or other fluid from the manifold into the mixing chamber of the eXhauster are protected Exhausters of this ‘type are generally well known as parts of con from abrasion by the material passingthrough veyor systems for conveying ashes and the 1ike. 10 the exnauster and are readily accessible from the The ‘principal purpose of the present invention exterior ofthe exhauster so that they may be is to provide an exhauster of the character men removed ‘and replaced without necessity for re tioned above which when inserted in a conduit ' moving any other part of the e'xh'auster. The may have any of the fast wearing parts replaced invention contemplates also that the protecting or may be changed to ?t different operating con 15 means by which the nozzles are protected from ditions without breaking a main joint in the con abrasion may also be readily replaced without dis duit and without disturbing those elements such turbing the various parts of the exhauster. ~ as the manifold and the suction chamber and ‘ It is a further purpose of the invention to pro discharge conduit coupling ?ange that are essen vide'in an exhauster of the character described tially the same for all operating conditions. 20 an'improved combination of a suction chamber In the basic design of exhausters of this char with the manifold and mixing chamber whereby acter the different degrees of vacuum to be estab the ef?ciency of the exhauster as a whole is mate lished, the steam pressure to be used, and other ' rially increased. operating conditions often require substantial The present invention contemplates also as an variations in the contour, size and design of the 25 object an exhauster wherein all of the wear parts ' mixing chamber, throat and discharge tube of the such as the tubular members making up the exhauster proper as Well as changes in the‘ angle suction chamber‘, the nozzle protectors, the mix at which the steam nozzle discharges into the > ing chamber, the throat and the discharge tube mixing chamber and changes in the interior con struction of the nozzle itself. The present ap constitute individual elements normally rigidly 30 paratus is particularly directed to a device whereby such design changes may be made in the parts above referred to without in any way'affect ing the manifold, thesuction chamber, the dis charge ?ange and the connecting frame members. 35 Variations in the angle. at which the nozzle is directed into the suction chamber are‘taken care held in place but readily replaceable while the main joints of the conduit and the manifold re main connectedlin their usual fashion, the ar rangement being such that during the removal and replacement of a part the means connect ing the exhauster in the line of the conduit re main to form a cradle or support for the new part until it is clamped in place. i of by different nozzle housings while the mix ing chamber, the throat and discharge tube, The features and advantages of the invention will appear more fully from the following descrip which together with the suction chamber make 40 tion», reference being had to the accompanying up that part of the exhauster called the diffuser ‘ drawings wherein a preferred form of the inven tube, have their interior dimensions and contours tion is shown. It should be understood however variable without changing the overall dimensions that the drawings and description-are illustra and the exterior contours; The savings in manu tive only and are not to be taken as limiting the facture and maintenance because of the afore 45 invention except insofar as it is limited by the mentioned features are numerous. Standard In the drawings: ' parts for the manifold suction chamber casting, the discharge ?ange and the frame members may Fig. 1 is a view in side elevation of an exhauster be employed. Also, the patterns for the other assembly embodying my invention, certain of the parts remain the same, it being necessary only 50 steam jet nozzles being left off for the sake of to change the cores thereof to suit the desired clearness, and the lower portion of the device design. It is obvious that the quantities of mate being broken’ away; rial which must be carried in stock are greatly Fig. 2 is an enlarged sectional view taken reduced. lengthwise through'a portion of the exhauster It is also‘ an object of the invention to provide 55 illustrating the manifold construction and'its con claims. I i I ' .3 thereon to which the frame members 2| and 22 are bolted by a plurality of bolts 2'! and 28, the bolts Z'Iserving to attach the frame member ill to the lug 25 and the bolts 28 serving to attach the frame member 22 to the lug 26. The frame members 2I and 22 are constructed of steel chan nels. nection. in the conduit line alongwith the frame ‘ members “which serve to lock togetherptwo edges ' ' of the conduit between which the exhauster is‘ inserted; Fig. 3 is a plan view of the exhauster, certain ‘ of the nozzles being left out for the sake of clear ness; . I Asuction chamber casting, 29 which'is cyline Fig. 4 is a fragmentary sectional view taken on drical in cross section has a reduced portion 36 Fig. 5 is a fragmentary sectional View taken‘ 10 that slides into the manifold I2 to abut against the conduit IE! and form a continuation thereof. on the line 5-5 of Fig. 1; This suction chamber casting has an enlarged Fig. 6 is a fragmentary sectional view taken annular portion 3! which is provided with a mul on the line 6-45 of Fig. 1; / the line 4—4 of Fig. 1; s Fig.7 is a fragmentary sectional View takenon . . the line 'i'—l of Fig. 1, further illustrating the coupling of ‘a conduit to the discharge end of the ‘ exhauster ;' ‘ tiplicity of rectangular apertures 32 around the thereof. in periphery ly spaced and ;in i These apertures are uniform thev present form there are eight of them. The wall around each aperture is recessed as indicated at 33 to provide a seat Fig. 8 is a sectional view taken on the line isv-d-s ; for a nozzle housing 34 which has a rectangular of Fig. 3 but on an enlarged scale; Fig. 9 is a plan view of one of the eight nozzle 20 ?ange 35 around the periphery thereof. The nozzle housing is also a casting of a material that housings that are embodied in the device; Fig. '10 is a sectional view on the line |a_ic of Fig. 9; and Fig. 11 is a fragmentary sectional view'takenw ,onthe line II—‘II of Fig. 1. . - Referring now in detail to the drawings, the ‘present invention is’ embodied in an exhauster, the purpose of which is to establish a vacuum in ' a receptacle or conduit which is connected to the inlet side ‘of the exhauster whereby to induce a now of air into, through and out of the receptacle .or'conduit. The exhauster is often required'to is designed to resist abrasion. ' The nozzle housing is shown in’ plan View’ in Fig. 9 and in section in Fig. 10. .The housing has . 25 a tubular portion 36 which is adapted to project beyond the end of the suction chamber casting into va mixing chamber 31 as illustrated in Fig. 2. The tubular portion'36 has a cylindrical bore‘ 38 ' and the bore 38 is enlarged at 39 to receive a packing ring 40 (see Fig. 2). A nozzle 4| ex tends intothe bore 38 and is connected by a cou pling 62' to a length‘ of pipe 43 that leads to a serve as a part of the conduit into which it is . inserted, and the conduit is used to transport union coupling 4d, one section of which is on the ' granular materialsiwhich are carried in suspen pipe 45 which is threaded into one of the outlets ' sion by the air stream that is caused to ?ow through the conduit by means of the exhauster. This granular material of course travels through the'exhauster. ‘ , - One of the principal‘uses for devices of this character is in the conveying of ashes. Naturally thematerial in the ash may be highly abrasive and it always presents a problem of replacement of parts that become worn or damaged due to ‘ the: abrasive action of the material conveyed ‘through the exhauster. The present'exhauster ‘ .is so constructed'as to provide a highly ef?cient‘ vacuum creating and conveying device with facili . ties whereby the abrasive action of the material i ‘ conveyed occasions a minimum amount of shut down for replacement of parts. Referring now to Figs. 1, 2, 3 and a. my in; vention is shown as mounted in a conduit line consisting of an ‘inlet section, It and a discharge ' section II. A steam manifold. I2 has one face pipe‘ 43 and the other section of which is upon a Ii. It will be evident from the foregoing descrip tion that if it is desired to remove a nozzle 4| for purposes of replacement or repair of the noz zle or'of the nozzle housing 34 the coupling 44 is ‘loosened and the housing and nozzle can then be removed or the nozzle itself can be removed while the housing remains in place. The housing protects the exterior of the nozzle from abrasion but of course it does not protect the tipv of the nozzle from abrasion due to the passage of steam through it. If a different nozzle is desired due to di?erentcharacteristics of the exhauster it is possible to replace the present ‘nozzle without disturbing the rest of the apparatus.v Also, new 50 ‘housings and nozzles to provide a different di rection of jet into the mixing-chamber may be ~ applied withoutidisturbing the mountingpof the suction chamber casting. ' > _ I That part of the exhauster unit that I refer to as the diffuser tube is composed of thesuc I3 thereof drilled to receive bolts I4 which pass‘ through a flange I5 of the conduit I0 so that the tion chamber 29, a mixing chamber‘ casting 31, .a throatvcasting' 6| and a vdscharge tube casting manifold can be attached directly to the con 62. The mixing chamber 31 is a part of the dif fuser Wherethe steam from the nozzles 4| mixes with the material being drawn from the conduit Ill. This mixing ‘chamber is a casting, conical iduit. The manifold I2 has an inlet opening I 6 and has a plurality of outlets I1, there being eight of the outlets IT in the form of device'shown.‘ Of course the number of outlets may be changed to suit any particular installation. _ ' in shape, with its larger end of'the same size as ‘the .outlet end of the suction chamber. Both The manifold I2. also has two oppositely dis posed lugs I8 which project from its face I9 op E165 castings 29 and 31 are provided with annular posite the conduit receiving face I3. These lugs I8 are drilled or cored to receive two bolts 20 in v?anges at their meeting ends. The casting 29 ' has a flange 46 thereon and the casting 31 has a ?ange 41 thereon. These two ?anges are each lug, these bolts serving to attach two frame members 2| and 22 to the manifold l2. The ‘frame members 2| and 22 extend in parallel rela-i tion from the manifold I2 to a discharge ?ange and 49. The split. ring section 48 is the bottom section (see Fig. 1) and is bolted to the frame 23 which is in th'e'form of a split ring and which members 2| and 22 by means of -a pair of bolts clamped together by two split ring sections 48 '50 and 5! ‘passing through the frame member 22 and a pair of bolts 52 and 53 ‘passing through the may be bolted to a ?ange IIa on the conduit'l I‘. The discharge flange 23‘ha's two lugs .25 and 26 575 iframeplmember 2|. The showing in Fig. 2 illus is provided with threaded holes 24 by which it‘ 2,404,203 5 trates the construction of the split ring 48 and the manner in which the bolts 52 and 53 secure it in placer The bolts 56 and 5| of course se cure the other side of the split ring in'the same fashion. The split ring section 49 is a duplicate of the section 48 and the two ring sections are 6 . corresponding shoulders provided on the sections 23a and 23b. The bolts 21 and 28 are arranged in sets of two for each section of the ‘discharge ?ange 23 so that once the discharge flange is clamped in place the upper pair of bolts 'canbe applied. The lower pairs of bolts are of course permanently used to fasten the lower half of the discharge ?ange 23 in place. ' provided with a packing ring 54 to seal the joint between the two ?anges 46 and 41 on the cast It is believed the construction of the exhauster . ings 30 and 31. In order to clamp the two split ring sections 48 and Y49 together I provide two 10 will be clear from the foregoing description. The principal features and advantages lie in‘ clamping lugs 55 and 56 (see Figs. ly and 4) at the protection of'the manifold by means of the each of the frame members, and these lugs are suction chamber casting, the accessibility of the secured together by bolts 51 which pass through nozzles and their protection by means of the the ?anges of the frame members 2| and 22 and which are provided with nuts '56 in order that 15 nozzle housings, and the ready access to any section of the exhauster without disturbing the the lugs 55 and 56 may be drawn together and connection between the conduits l6 and II. It in turn clamp the split ring sections together in is believed to be evident from the foregoing de the manner illustrated in Fig. 4. When the top scription that the frame members 2| and 22, to ring section 49 is clamped in place it is then per manently fastened by means of suitable bolts 59 20 gether with the manifold l2 and the lower half T of the discharge ?ange 23, constitute a perma and “passing through each of the frame mem nent and rigid connection between the conduits bers 2| and 22 and threading into the section 49. l0 and II. The lower half of the discharge The small end of the mixing chamber cast ?ange 23 coupled with the lower sections 63 and ting 3'| abuts a short cylindrical‘ casting 6| which forms the throat of the diffuser. The inner size of the casting BI is the same as the inner size of the mixing chamber casting 31. The discharge 48 also provideia cradle or support for the sev eral castings 36 and 37 and 6| and 62 so that these castings maybe laid in place and taken ' tube casting 62 abuts the other end face of the out and replaced with a minimum amount of throat casting?l, the discharge casting 62 being di?iculty. ‘ ' - ; The particular design of the suction chamber conical in construction and increasing in di and the diffusing tube is ‘such as to permit the ameter from the throat casting 6! to the conduit nozzles to be advantageously used to direct the ||. The throat casting 6| and the castings 3'! discharge from the nozzles into the throat of the and 62 are clamped together by means of 'two exhauster with a minimum loss of available en split ring sections 63 and 64 (see Figs. 1; 3 and 5). ergy. This factor and the protection of the The lower ring section 63 is permanently attached nozzles aiforded by the nozzle housings tend to to the frame members 2| and 22 by two hor lengthen the life of the castings. H and‘ 6| which izontally extending lugs 65 and the upper sec bear the brunt of the abrasive action of the ma tion 64 has similar lugs 66. The lugs 65 are bolt terial being drawn through the exhauster. ed to the frame members 2| and 22 by bolts 6? In each individual installation of an exhauster and the lugs 66 are similarly bolted to the frame 40 the factors'which determine the particular nozzle members 2| and 22 by bolts 68. The two ring that will be used and the particular‘ mixing cham sections 63 and 64 are clamped together by two her, throat and discharge tube that will be used - bolts 69 and 16 which pass vertically through the may be widely different from the factors ,en lugs 65 and 66. The bolts 69 and 16 are pro vided with nuts ‘H and "I2. A packing ring 1'3 45 countered in another installation. For example, if a much higher vacuum must be maintained serves to seal the joints between the castings 31 in the suction chamber, this does not require any and 62 on the one hand and the throat casting redesign of the suction chamber but it does re 6| on the other hand. It will be noted that the quire changes in the nozzles, mixing chamber, top ring section 64 can be removed by taking off the nuts ‘H and 12 and releasing the bolts 50 throat and discharge tube.‘ With my invention the basic parts of the exhauster, namely, the, 68. Thus it is a fairly simple matter to replace manifold, the suction chamber casting, the dis a throat casting 6| whenever that is desired. charge ?ange and the frame members which con The throat casting being at the point of smallest nect the discharge ?ange to the manifold may diameter in the entire exhauster is subject to the greatest wear and therefore should be ca 55 be the same for a great variety of conditions so long as the conduits in which the exhauster is pable of ready replacement with a minimum to be inserted are essentially the same in diame amount of di?lculty. The present construction ter. Changing conditions therefore in an in makes such replacement possible. stallation requiring higher or lower vacuum may The discharge end of the discharge tube 62 is be made by changing only those parts which provided with an exterior rib 14 which seats have to be changed to get the desired result, in a corresponding recess in the discharge ?ange namely, the mixing chamber, throat, the dis 23. I have previously described how the dis charge tube and the nozzles and their housings. charge ?ange 23 is in turn connected by means It is believed to be apparent‘from the foregoing of bolts 24a that pass through a ?ange on the 65 description that I have provided an exhauster conduit II and are threaded into the holes 24 in the discharge ?ange. A packing ring 15 is interposed between the end of the discharge tube 62 and the adjacent face of the conduit ||. The two sections 23a and 23b of the discharge ?ange 23 are illustrated in Fig. 6 which also illustrates how these two sections are clamped together. Two bolts 16 and 11 having nuts 18 and ‘Hi thereon pass through the ?anges of the mem bers 22 and 2|, respectively, and serve to clamp two sets of clamping lugs 80 and 8| against the 27-5 which is simple in construction and capable of adaption to a great variety of conditions en countered in individual installations with a mini mum amount of change. It is‘ also believed to be evident that the exhauster hereinbefore described is particularly adapted to keep “maintenance cost at a low level by cutting down the replacement to only those parts that are actually worn, and making such parts readily accessible for replace ment.‘ ' r 1 r - ~ ~ = 2,404,203 7' 8 V Having'thus describednmy invention, what'I‘ tachment of a conduit thereto, a diffuser tube 1_.'In'a steam jet exhauster’ of the character described, a steam manifold of ring form having secured to the frame members, and extending from the manifold to the ‘discharge ?ange, said diffuser tube having ?uid jet nozzle inlets in the periphery thereof adjacent to the manifold, and means on one face thereof for connection toga ?uid, jet nozzles connected to the manifold and claim as new and desire to secure by vLetters V " Patent is: r - ' conduit, oppositely disposedframe members af extending through said nozzle inlets. 6. In a steam jet exhauster of the character‘ ?xed to said manifold and projecting fromsaid , manifold in the direction opposite to the conduit, ‘ described, a steam manifold of ring form having said frame members having a discharge ?ange-af 10 means on one face thereof for connection to a ?xedthereto at the ends remote from the mani fold, said discharge ?ange having means for at 1 tachment of a conduit thereto, spaced two-sec ?xed to said manifold and projecting from said conduit, oppositely disposed frame members af- . manifold in the direction opposite to the conduit, said frame members having a discharge ?ange tion connecting clamps attached tosaid framev members intermediate the ends thereof, a diffuser ‘15 af?xed thereto at the ends remote from the mani tube interposed between the manifold and the fold, said discharge ?ange having means for at? discharge ?ange and having a mixing chamber, ‘ tachment of a conduit thereto, a diffuser ,rtube a tubularthroatportionand a tubular discharge secured to the frame and extending from the portion, said portions being removably supported manifold to the discharge ?ange, and clamping on said, frame membersby-said clamps‘ and said means carried by said frame members securing said diffuser tube to said members, saiddiffuser discharge ?ange, a suction chamber comprising a tubular member having an inlet end extending tube comprising a plurality of tubular sectionsand said clam-ping means comprising split rings cover into the» manifold whereby to protect the inner . wall thereof, said tubular member having cir " cumferentially spaced apertures therein, nozzle housings in said apertures and steam jet nozzles connected to the manifold and. extending through said housings andapertures into the in terior of the mixing chamber. ing the joints between said sections. 25 4 2. In an exhauster of the character described, a pressure?uid manifold of ring form, a suction I '7. In a steam J'et- exhauster of the character described, a steam manifold of ring form having means on one face thereof for connection to a ' conduit, oppositely disposed frame members af ?xed to said manifold and projecting from said manifold in the direction opposite to the conduit, , said frame members having‘ a, discharge’ ?ange chamber tube having an inlet portion registering a?ixed thereto at the ends remote from the mani fold, said discharge ?ange having means forat-l, , having nozzle mounting apertures peripherally = tachment of aconduit thereto, a diffuser, tube spaced about it, said manifold having outlets '35 secured to the frame and’ extending from the therein outside the suction chamber tube and manifold to the discharge ?ange, said diffuser 3 removable nozzlesconnected to said manifold to \ tube comprising'a tubular suction chamber sec;v ‘ receive ?uid from said outlets,» said nozzles ex tion having an inlet portion extending into the , with the opening through said manifold, said tube 1 tending into the suction chamber tube. through manifold ring protecting the inner wall thereof . said apertures. from abrasive action of’ the material passing through the manifold ring, a conical mixing ' - v3. In an exhauster of the character described, a pressure ?uid manifold of ring form, a suction chamber section abutting said casing, a throat chamber tube having an inlet portion registering with the opening through said manifold, said section abutting the mixing chamber section, and a conical discharge section abutting the throat, section and extending to the‘discharge ?ange. 8. In asteam jet exhauster of the character described, a steam manifold of ring form having 1 tube having nozzle mounting'apertures periph 1 erally spaced about it, [said manifold having out 1 lets therein outside the suction chamber tube, ‘ removable nozzles connected to said manifold to receive ?uid from said outlets, said nozzles ex tending into the suction chamber tube through 1 said apertures, and nozzle guards mounted in said apertures and shielding the walls of the nozzles ‘ from the interior of said tube, means’on one face thereof for connectionto a conduit, oppositely disposed frame members af ?xed'to said manifold and ‘projecting from‘, said manifold in the direction opposite to the conduit, said frame members having a discharge ?ange a?‘ixed thereto at the ends remote from the mani fold, said discharge ?ange having means for at 4. In an exhauster of the character described, 1 a pressure ?uid manifold of ‘ring ,form,‘ a suction 55 tachment of a conduit thereto, a diffuser tube 3 chamber tube having an inlet portion registering secured to the frame and extending from, the with the opening through said manifold, said manifold to the discharge ?ange, said diffuser tube comprising a tubular suction chamber sec erally spaced about it, said manifold having out tion having an inlet portion‘ extending into the lets therein outside the suction chamber tube, 60 manifold ring protecting the inner wall'thereof and removable nozzles connected to said mani from abrasive action of the material passing fold to receive ?uid from said outlets, said nozzles through the manifold ring, a conical mixing extending into the suction chamber tube through chamber section, abutting said casing, a ‘throat said aperture, said tube having seats about said section abutting the, mixing chamber section and apertures and said guards having ?anges rest 65 a conical discharge section abutting the throat ing on said seats. , Y section and extending to the discharge ?ange, 5. In a steam jet ‘exhauster of the character said suction chamber section having peripherally described, a steam manifold of ring formnhaving spaced nozzle inlets therein and removable nozzle 1 tube having nozzle mounting apertures periph- = 1 ‘ j _ = 1» 1 ‘ ; means on one face thereof for connection to a 1 ‘ conduit,.oppositely disposed ‘frame members af_' ,70 housings in said inlets. ' " 9.-In a steam jet exhaustenofhthecharacter, 7 1 ?xed to said manifold and projecting from said " described, a steam manifold of ringform having manifold in the directionopposite to the conduit, - means’, on one face’ thereof for connection to a said frame members havinga discharge ?ange a?'ixed theretoat the ends‘remote from the man- i 3 ifold, said discharge ?ange having means for. at? 175 conduit, oppositely disposedframe members af ?xed to. said manifold and projectingfrom said manifold in the direction opposite to the, conduit,‘ 2,404,203 > said frame members having a discharge ?ange affixed thereto at the ends remote from the mani fold, said discharge ?ange having means for at tachment of a conduit thereto, a diffuser tube secured to the frame and extending from the manifold to the discharge ?ange, said diffuser tube comprising a tubular suction chamber section having an inlet portion extending into the mani fold ring protecting the inner wall thereof from ' abrasive action of the material passing through 10 the manifold ring, a conical mixing chamber sec tion abutting said casing, a throat section abut ting the mixing chamber section and a conical discharge section abutting the throat section and 10 said frame members having a discharge ?ange a?ixed thereto at the ends remote from the mani fold, said discharge ?ange having means for at tachment of a conduitv thereto, a‘diffuser tube secured to the frame and‘ extending from the manifold to ‘the discharge ?ange, said diffuser tube comprising a tubular suction chamber sec tion having an inlet portion extending into the manifold ring protecting the inner wall thereof from abrasive action of the material passing through the manifold ring, a conical mixing chamber section abutting said casing, a throat section abutting the mixing chamber section and a conical discharge section abutting the throat extending to the discharge ?ange, said suction 16 section and extending to the discharge ?ange, said suction chamber section having peripherally chamber section having peripherally spaced noz spaced nozzle inlets therein, outlet conduits con zle inlets therein, outlet conduits connected to the nected to the manifold at peripherally spaced manifold at peripherally spaced‘points thereon points thereon outside of and around the suction outside of and around the suction chamber sec tion, and ?uid jet nozzles on said conduits extend 20 chamber section, ?uid jet nozzles on said con duits extending through said inlets, and nozzle ing through said inlets. , housings in said inlets protecting the portions of 10. In a steam jet exhauster of the character means on one face thereof for connection to a the nozzles interiorly of the suction chamber sec tion from abrasion by material passing through conduit, oppositely disposed frame members af said section. described, a steam manifold of ring form having ?xed to said manifold and projecting from said manifold in the direction opposite to the conduit, ' CARL F. ZIMMERMANN.