Патент USA US2409456код для вставки
Get. 15, 1946. M. STEUE’RMAN 2,409,451 AIR PREHEATER FOR FURNACES AND THE LIKE Filed' Jan. 8. 1944 5 Sheets-Sheet 1 Inventor MAREK vsmusmmw 8*’ ‘F %_Atlorney weft-Q Oct. 15",‘ 1946. M, STEUERMAN ’ 2,409,451 AIR PREHEATER FOR FURNACES AND THELLIKE' Filled Jan. 8. 1944 3 Sheets-Sheet .2 Inventor MARE“ S’T'EUERMAN By ' .AM % Attorney 0d. 15, 1946. M, STEUERMAN ' 2,409,451 AIR PREHEATER FOR FURNACES AND THE LIKE ' Filed Jan. 8. 1944 I 3 Sheets-Sheet s v Inventor V ' v AREK s-rzusnmu ‘ By L5 Attorney 2,499,451 Patented Oct. 15, 1946 UNITED STATES PATENT ' OFFICE 2,409,451 AIR PREI-IE‘ATER FOR FURNACES AND THE LIKE Marek. Steuerman, London, England Application January‘ 8, 1944; Serial No.»517,601 In Great Britain March’. 26,1942 4 Claims. (Cl. 110-175) . 1 This invention concerns air preheaters for vfur naces and the like. of the kind adapted to be ' mounted on the inside or the ?re doorior in any other suitable convenient position for the pur~ 5 pose of preheating air passing into the furnace above the ?re grate with the object of obtaining improved combustion of the fuel on such grate, such preheaters each comprising a hollow body adapted to be heated by the ?re in the furnace . 2 . tuous path at or near the upper part of the hol low'body. .After leaving this tortuous path the air may be discharged‘ directly’ intovthe‘ furnace through one or more openings .in the front Wall and/or top and/or ends of the hollow bodyior in vany other suitable way, or‘ a supplementary or superheating chamber may be provided at the upper portion of V the preheater, which: cham ber may project forwardly beyond the front‘fauce of the front wall-1 of the hollow body, and. which and constrcted so thatlair, ‘or some air, on its 10 may have. a rectilinear; curved, or otherwise suit way into the furnace may pass through the pre'. heaterand be preheated prior to entering the ?respace. An object of this invention is to'provide an im ably shaped front wall. in which isor are- ar ranged one or more discharge apertures. The arrangement is» preferably such that‘ air proved‘. form? of air preheater, and according to 15 is admitted into the space between the movable ?ap or partition and the front wall of the hol the invention there is provided an airpreheater low body through a gapbetween these two parts, of'thelkind referred to for furnaces‘ and the like, wherein within‘ the hollowbody, and behind the front wall (i. e., the wall presentedzto the ?re) thereof, is arranged a ?ap or partition. dividing the‘ hollow body into two compartments, such ?ap or partition being movable towards and away from the said front wall to. control the flow of air the closing or opening’ of the said gap, and the extent to which itis opened being obtained and regulated by adjusting the movable ‘?apor par tition'with respect‘ to the front wall of the hollow body. Preferably said gap is provided at the lower part of. the hollow body and. is constituted on the one hand by ‘a‘longitudinal seat formed 25 upon the inside of the front wall-of the hollow body, and on the other hand by the front ‘sur face of the adjustable flap or partition which is adapted, in the closed position of the ?ap or partition, to seat upon the said‘seat, thus closing ‘30, the‘ gap entirely. ‘ Assuming, the preheater to be set with its rear Wall vertical, the said longitudinal through the space between the front wall of the hollow body and the such ?ap ‘or partition, and wherein means are, also provided for adjusting the position of such. flap or partition preferably from the exterior‘ of the hollow body. Moreparticularly the invention is concerned with air preheaters of the kind referred to and in which 'baflle means are‘ provided within‘ the seat, which is preferably horizontal, is convenient7 hollow body to ensure that the air to be preheated ly disposed at a; shbrt distance from the bottom of will take a tortuous‘ path through the hollow the hollow body and‘ at a location intermediate body; Therefore, according to a further feature 35 the‘ front wall and the, back of the hollow ,body, of the invention ba?ie means are‘arranged be ' and the said movable flap or partition preferably tween the said movable ?ap or partition and the extends from end to end of the hollowbody and said front wall of the hollow body to'de?ne one from the top thereof to a position somewhat be or“ more tortuous‘pathsi to which theair passing low the said seat so that the movable ?ap or through the space between the front‘ wall of the partition, with the said‘ sea-t, separates ‘the said hollow body and the movable ?ap or partition 40 two compartments of the hollow body from one must, pass. Preferably the said ba?le means‘ are constituted by co-operating interleaved baffles another, aslot-like portionibeing left,‘ however, adjacent the bottom ofthe hollow‘ body so as to carried ‘respectively upon one surfaceof the said serve ‘as an‘ air inlet for the entry of . air into movable flap. or. partition. and,‘ on the. opposite in 45 the hollow body" and to the said regulatable gap sidesurface ofrthersaid front ‘wall of the hollow between the/movablerflap or» partition and the body. ‘ ‘ . Prefera'bly, buti'not necessarily, the-arrangement of'the said'ba?le“ means‘ is such that the air to said seat on‘ the front wall, Alternatively,.the said adjustable ?ap‘ or partition may extendvto the" bottom of the hollow body and be provided with a hole or holes vfor the'passage of air there 50 forwards in the. hollow body‘ (i. e. transversely through at positions below the seat of the front of the‘said movable ?ap or partition and the wall. . front'wall of thezhollowi body), the air preferably Preferably‘the frontzwall of the hollow body is enteringthetortuous- path" provided by the ba?le formed internally with a.- series of ‘side by side be preheated passes tortuously‘backwards and meansi at or; near the. lower‘ part" of. the hollow body, gradually rising‘ to, and. leaving the ‘tor 55 parallelbutisomewhat spaced channels arranged 3 2,409,451 4 one above the other and extending longitudinally successive sections to expose otherwise hidden of the hollow body, and between these channels parts of the interior construction of the pre are arranged the hereinbefore mentioned ba?ies heater; which exend parallel to the channels and back Figure 5 is a section on line 5—-5, Figure 4; wardly from the said front wall. Similarly the Cl and front side of the said movable ?ap or partition is correspondingly formed, but the channels and ba?les of this ?ap or partition are offset with respect to those of the front wall, so that the ' ' Figure 6 is a perspective view of the flap or partition in the interior of the preheater. The air preheater illustrated in the drawings is intended to be attached to the inside of a fur ba?les of the ?ap or partition project more or 10 nace door. The preheater comprises a hollow less centrally into the channels of the front wall, body I of rectangular form as seen from the and vice versa. rear. From back to front it is relatively shallow The front surface of the front wall may be as compared with its length and breadth and its ridged or corrugated to increase its area and so front wall 2 inclines backwardly and downwardly to increase the heat exchange surface thereof. Conveniently this front surface of the front wall of the hollow [body is corrugated or ridged lon gitudinally, the crests of the corrugations follow, ing in shape, and coinciding in position with, slightly so that it is rather nearer the rear of the hollow body at the bottom thereof than it is at the top. At its upper end the front wall 2 is externally and internally extended forwardly at 3 so as to the bottoms of the channels in the rear side of 20 provide a longitudinal forwardly extending the front wall, which bottoms are preferably of chamber 12. The front wall 5 of this chamber semi-cylindrical form (i. e., semi-circular in is rectilinear and parallel to the back edge of cross-section). Thus the front surface of the the top ‘wall 6 of the hollow body, but the said front wall of the hollow body will appear to be front wall could be curved, e. g., convex, or in made up of a series of parallel side by side su 25 clined forwardly from its ends towards its centre perposed strips or bars, the front surface of each if desired. The wall 5 is provided with a row of of which is of part cylindrical form. The chan air discharge openings 7 which are conveniently nels and ba?ies of the said ?ap or partition may circular in cross-section and of frusto conical be shaped and arranged similarly to those of the form, the narrower ends of the holes being their front wall of the hollow body and the battles of forward ends. The axes of the holes may be both the latter and the said ?ap or partition may horizontal or somewhat downwardly inclined and taper towards their free longitudinal edges. they may or may not be parallel as seen in plan; A back plate may be provided to close the rear for example, the axes of the holes as seen in plan of the hollow body, or instead of using a back may splay outwards somewhat in the manner plate the furnace door may be relied upon to 35 of the thumb and ?ngers of an extended hand, effect the closing of the rear of the hollow body. or they may converge towards one another in If, however, a back plate is used, then it is pro a forward direction. Except for the discharge vided with one or more air inlet openings. Such holes above mentioned the front of the hollow inlet opening or openings may be at any suitable body is entirely closed. position and of any convenient shape and size, 40 The bottom wall 8 of the hollow body is of a but preferably a single opening is provided at sinuous or ogce form in cross-section, so that the lower part of the back plate, this opening inside the hollow body the bottom is on two being of elongated slot-like form extending al— most from end to end of the plate and having its upper edge coinciding with the lower edge of the said movable ?ap or partition. Preferably the front wall of the hollow body is backwardly and downwardly inclined with re spect to the plane passing through the rear edges of the walls of the preheater, so that, regarding the preheater in end elevation, it appears to de crease in depth (from front to back) in a direc tion from the top towards the bottom, i. e. it is of wedge shape in end elevation. Preferably the said movable ?ap or partition is pivotally mounted at its upper end in the hollow body, and screw and nut means are pref erably provided on or near its lower end for ad levels, that is to say, the bottom consists of two longitudinal horizontal steps, a lower rear step 9 and a higher forward step I 0 separated by a substantially vertical longitudinal part or “riser” II. The rear edge of the said forward step is provided with a backwardly directed ridge or flange I2 which extends from end to end of the hollow body and overhangs the more or less ver tical part or “riser” II. This backwardly di rected ridge or ?ange l2 constitutes a seat upon which is adapted to sit, in certain circumstances, the lower part of a hinged ?ap or partition l3 subsequently to be more fully described. ' Between the part of the bottom wall 8 of the hollow body and the bottom wall M (which wall also serves as a baffle) of the said chamber 4, and within the hollow body, are arranged a plurality lusting the flap or partition, the screw part of the adjusting means being extended so as to pro 160 of longitudinal parallel preferably equally spaced ject rearwardly of the preheater and being ba?ies “5 which are formed in one with the in-' adapted to pass through the furnace door and side surface of the front wall 2 of the hollow to be provided with a handle or knob at its outer body and extend from end to end of the latter, end so that the required adjustments may be parallel to the bottom 8 of the hollow body and made from the exterior of the furnace. backwardly from the said front wall 2 so as to In order that the invention may be thoroughly have their rear edges substantially flush with understood and readily be carried into practice, the rear edge of the said longitudinal seat ID. drawings are appended hereto in which: This rear seat edge, and the rear edges of all Figure 1 is a front elevation of one form of the above-mentioned ba?les, are spaced some preheater constructed according to this inven 70 distance from the plane containing the rear tion; edges of the top and bottom walls 6 and 8 and Figure 2 is an end elevation of the same; the side walls l6 and ll of the hollow body, and Figure 3 is a section on line 3--3, Figure 1; since the ba?les l5 are preferably all of the same Figure 4 is a back elevation of the preheater width from back to front as one another, and shown in Figures 1 to 5 partly broken away in as the front wall 2 of the hollow body inclines 2,409,451 "downwardly towards the‘ back of the_‘ hollow body, ‘the rear‘ edges of‘ the baflles ‘are ‘consequently spacédprogressively further away‘ from-the said plane ‘containing the ‘rearv edges of the- top and bottom and side-walls of the‘hollow body, ‘start ing from the bottom‘bai?e and travelling towards 6 and ‘ the ‘ front- surface of‘ the - hinged flap. ' ‘Thus the cooperating parts -|2 and"23 act as'a form’ of valve. ‘ I ' ‘On the back of- the hollow body is secured,-by screws, ‘the metal back cover plate‘ 25 which is formed‘ of metal- and which. has a portion of elon gated rectangular form cut out of its lower edge the upper‘ ba?le.‘ i i ‘' l . to form an air inlet‘ opening 30 opposite the space ~iThe inside surface is‘ of ‘the front wall 2 of between the bottom edge of the said hinged ?ap the hollow body is, between‘ ea'ch'pair ofwbailles l5».and between. the step [0 and the next ba?le 10 i3 and the lower and rearmost step-like part 9 '- and-between the topbaf?e. l5 and the lower wall _"l4~>of the» saidlchamberllly is shaped to substan tially semiecylindrical- concave formas seen from the back,-and‘the outer frontlsurface of-the front wall» '2' is correspondingly shapedso that the front ‘ wall ofii-the hollow body has-a plurality of longi tudinal; parallelconvex ribs I9 projecting‘ there ‘from; the longitudinal grooves 0r depressions 2i] " between which; ribs- correspond in position with the‘ba?l‘es within the‘ hollow body. Additional. of the bottomt of the hollow body. -‘ ‘For the purpose of adjusting‘the hinged ?ap i3 towards and away from the frontlwall 2 of ‘the hollow body, a, screwed stem 3 I‘ is provided which is mounted for rotatory, but non-axial, move ment in a sleeve-32 screwed‘ into the back plate ‘25 at the lower part of, and perpendicularly to, the-latter. The said sleeve is ‘adapted to pass through the furnace door, and‘ the sleeve and screwed stem are of! such a length as to be capa ble of projecting beyond the outer side of‘the = rib-s; ?ns, corrugations or projections may be pro furnace door whilst the stem 3i also extends into vided on the ‘hollow body if desired further to the hollow body land into the said hinged'flap increase'the area of- the heat exchange surfaces. ‘+3: The outer‘ end‘of‘ the screwed stem 3| is'pro The irontiwall 2 also ‘has a flattened portion 39 on which may be carriedthe maker’s name or. . vid'ed‘ with a knob 33 for rotating it, and at‘ its ‘inner end“ thewstem is screwed into a nut~>35 otherdata> ~ which is housed in- a- non-rotatable mannerin The ‘hinged flap or partition l3 above referred a recess 36 provided‘v at the-lower central part of to is disposed within the hollow body I, and com the hinged'?ap I3 and closed by a Plate 31; prises a rectangular'plate which is‘ of a length Preferably the top, bottom and side or end walls substantially equal to the distance between the of the preheater slope inwardly towards the front inside surfaces of the two end walls 16 and I‘! wall thereof. of the hollow body, but which plate is of a, depth In use the preheater is ?xed, for example by from top to bottom somewhat less than the depth studs 38 within the furnace, for example ?at of the hollow body from top to bottom at the rear against the inside surface of the furnace door to theref. ' the outside thereof so that the knob 33 can be Adjacent its upper edge, the said plate is pro manipulated from the outside of the furnace. vided with a rib 2i carrying a trunnion 22 at each The gap 30 at the lower part of the preheater end (Figure 5) and each of these trunnions seats is registered with a corresponding gap or with in a bearing 23 (Figure 4) provided at the adja cent end wall of the hollowbody, and the trun~ 40 one or more air inlet holes provided in the fur nace door. nion is rotatably secured in that position by a The front wall 2 of the preheater is therefore cover piece 24 recessed into the back edge of the presented in a somewhat oblique position to the end wall of the hollow body and secured in posi ?re within the furnace and in operation air enters tion by one of the screws used to secure the back through the gap 30 and rises within the pre cover plate 25 (subsequently to be described) in heater between the part 28 of the flap or parti position. When hinged in the hollow body I the tion l3 and the seat l2 and then passes in a upper edge of rib 2! of the ?ap or partition [3 tortuous ‘backward and forward manner up lies adjacent the inside surface of the top wall through the preheater into the forwardly pro 6 of the hollow body. . jecting chamber 4 and eventually out of the dis On its inner side the ?ap i3 is provided (see charge holes ‘I in the upper forwardly project Figure 6 in particular) with a plurality of equally ing portion or bulge 5 of the preheater, the air spaced parallel longitudinal baffles 26 which are so leaving the preheater being directed towards preferably cast integrally with the plate, the plate, in cross-section, being of semi-cylindrical form between each pair of bailles as shown at 21. The baffles 25 on the flap is are similar to the baf?es IE on the inside of the front wall 2 of the hollow body I, but when the hinged plate is in position in the hollow body, the ba?ies 26 of the flap are offset with respect to the baffles IE on the hollow body so that the latter baffles project into the spaces between the baffles on the flap. However, the baffles on the movable flap and those on the front wall of the hollow body are preferably of such dimensions that the baffles on the one part never touch the bottoms of the grooves between the baffles of the other part, The flap l3 projects downwardly below the low ermost baffle 26 on the plate so as to provide a lon the ?re. If the discharge holes 1 are arranged with their axes downwardly inclined then the streams of air issuing from these holes will be biased in a down ward direction. The flow of air through the pre heater is regulated by adjusting the flap or par tition i3 to and‘ away from the front wall 2 of the preheater by means of the adjusting screw 3! and the associated parts, this screw being op erated by the knob 33 from the exterior of the furnace. If desired, the intake of air can be en tirely shut off by adjusting the flap or partition l3 so that the part 28 thereof bears against the seat I2. I claim: 1. An air preheater for furnaces and the like gitudinally extending dependent ?ange 2B which 70 comprising a hollow body, its top wall being sub stantially imperforate, its rear wall being provided adjacent its bottom edge with air in?ow means, the rear wall being otherwise substantially im provided on the hollow body, so as to prevent the perforate, the front wall of said hollow body ingress of air to the space 29 between the inner surface of the front wall 2 of the hollow body 75 being provided with air out?ow means adjacent is adapted, in the closed position of the flap, to seat upon the hereinbefore mentioned seat 12, 2,409,451 its upper edge, the front wall being otherwise substantially imperforate, the inner face of the front wall being provided with ba?‘le-like forma tions extending generally in like directions and transversely to the direction from said air in?ow means to said air outflow means; a plate disposed ‘within said hollow body intermediate the inner face of said rear wall and said baf?e-like forma 8 face of the front wall and said ba?ie-like forma tions of said inwardly disposed plate extend mu tually in parallel directions and substantially at ‘right angles to the direction from said air in?ow means to said air out?ow means. 4. An air preheater for a furnace or the like, comprising a hollow box-like body, such body including a rear wall provided with air inlet means at its lower part and including a front tions of said front wall, said inwardly disposed plate having baffle-like formations facing said 10 wall having air discharge means at its upper bailie-Iike formations of said front wall and gen part, a flap mounted within said body between erally in like directions and extending trans said front and rear walls and pivotable about its versely to the direction from said air in?ow means to said air out?ow means, the free edges of said baffle-like formations of said inwardly disposed plate being disposed alternately with respect to the free edges of said baffle-like formations of said front wall; means for pivotally mounting said inwardly disposed plate at its upper por tion; and means extending through said rear wall for adjusting the pivotal position of said in— wardly disposed plate. upper end, means operable from the exterior ‘of said rear wall for moving the lower end of said ?ap towards or away from said front wall, a shoulder on said front wall co-operating with the lower end of said flap to form a variable air inlet to the space between the ?ap and the front wall, a plurality of ba?les on said front wall pro jecting into said space between the ?ap and front wall, the parts of the rear face of said front wall between said bailles being of semi-cylindrical form, 2,. An air preheater pursuant to claim 1 in a plurality of baffles on said ?ap, such ba?les ex which said ba?le-like formations at the inner tending towards said front wall and being offset face of the front wall and said ba?le-like forma tions of said inwardly disposed plate extend mu 25 relatively to the baflies on said front wall, and the parts of the front face of said ?ap between tually in parallel directions. the ba?les thereon being of semi-cylindrical form. 3. An air preheater pursuant to claim 1 in which said baffle-like formations at the inner MAREK STEUERMAN.