US1745474A - Heat-insulating casing - Google Patents

Description

Feb. 4, 1930.

P cAsslDY HEAT INSULATING CASING 3 Sheets-Sheet Filed Sept INVENTOR S n N R O T T.. .A Y. BM

Feb. 4, 1930. P. cAsslDY HEAT INSULATING cAsING s sheets-sheet 2 Filed sept. 9. 192e 0' 000 z 0: 0. 0.0.0 0,0,0,0,0 0000 0,0,0,0, 0.0.0.9'A b 0000000000000. 003090000000000. 000000000000 0000000000000. "0000000000000, 000000000000000000. 000002.0000000000000000.. Y000000000 v000000000000* 0 000000000000000000. A 00000000000 00000. 0000000 .000000000000000 000000 Vv000 0000000,0

00000000 00 00000000 w0n000000 000 v0000.0000000. 000000 BY rm' ATTORNEYS Patented Feb. 4, 1930 UNITED STATES PATENT OFFICE.

IPERRY CASSIDY, yO1? DARIEN, CONNECTICUT, ASSIGNOR T0 THE BABCOOK & WILCOX i COMPANY, F BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY HEAT-INSULATING CASINGrv Applicationk led September 9, 1926. Serial No. 134,355.

j My present invention relates to casings, such as are commonly used for enclosing furnaces, boilers and the like to prevent the passage of heat from such structures, and will be be'stunderstoodvfrom the following description and the annexed drawings, in which Fig. 1 is a section of a portion of a boiler furnacewall and a boiler with a casing embodying one form of my invention; Fig. 2 is an enlarged view of a portion of` Fig. 1k onl the line 22 of Fig. 3; Fig. 3 is a view of Fig.v 2 looking in the direction of the arrows 3-3 of Fig. 2, and Fig. 4 is a view similar to Fig. 2 but showing a modification.

Like reference characters indicate like parts in the various views.

In heat-insulating casings, there is commonly provided a layer of any heat-insulating material which is ordinarily covered on the exterior and sometimes on the interior by a sheet metal covering. These coverings are y made up of metallic plates and the casing is .further provided with stiifening members extending along the sheet metal covering to hold the parts in position, the ends of these s Stiening members being 4ordinarily connected to the framing" ofthefurnace or other structure to which the casing is applied. As heretofore constructed, the casing covering `and the stiffening members have been ,ar-

ranged so that there are large metallic paths insulating material, thus nullifying to a large degree the eectiveness of the heatk insulation. By my present invention, I provide a means for holding the parts ofthe casing in position and, at the same time, minimize or entirely .v avoid any such jmetallic vpaths throughl the heat-insulating layer. Furthermore, thel panel plates which cover the heatinsulating material are yflat rand without flanges and may be sheared into plates of the desired size from sheet metal stock.

In theillustrative embodiment of my in vention shown in Figs. 1, 2'and 3, the refractory wall 10 is provided exteriorly with a layer of heat-insulating material 11 and a sheetV metal exteriory covering made up of plates 12. Extending along the exterior of kthe casing are stiftening members 13, the ends of which may be connected to the framing of the boiler setting. In the illustrative arrangement, the stiifening member is T-shaped in section, with an enlarged head 14 connected to the body portion of the stifening member. The adjacent edges of a pair of plates 12 are separated by the body portion of the stiifening member 13 with the head 14 inside of the plates 12, this body portion extending only a small distance inside the plates 12 and being buried in the heat-insulating layer 11, as shown best in Fig. 2. A packing 15, preferably in the form of a pliable strip of material not affected by heat extends along the joint between the edges of the plates y12 and the stiffening member 13, as shown in Fig. 2, and a metallic bar 16 is laid against this packing strip. y

Spaced 'along the body portion of the stiifening member 13 are pressure devices by which the bars 16 are pressed toward the plates 12 and toward the stiening member 13 in such a way that the plates 12 are clamped against the head 14 and sothat the packing 15 is also pressed into the joint between the stiffening member and the edges of the plates. In the form illustrated, each pressure device has a double-ended bolt 17 passing loosely through an opening 18 in the body portion of the stilfening member, each end of this bolt passing loosely through a bar 19 with the outer end of the bar resting against the body portion of the stifening member 13 and its inner end resting against one of the bars 16, the ends of the bolt 17 being bent so that these ends are atl right-angles to the surface of the bar 19. On tightening up the nuts 2O on the bolt 17, it will be obvious that each bar 19 is forced both vertically and horizontally in Fig. 2, and since the reaction of the bolt is against the body portion of the stiffening member 13, the'net result is that the plates 12, the head 14 and the packing strips 15 are all clamped together and held in position so that the plates 12 are fastened to the stiffening member 13 and, at the same Stime, the joint between the edges of such what is known as a double casing used in some places where the heat-insulating material is not held against a refractory wall,

as is the case in Fig. 2. In such casing, both the exterior and the interior of the refractorylayer 21 is provided with a metallic covering made up of plates 22 on the exterior of the layer and plates 23 on the interior of the layer. The stiffening member 13 and the arrangement by which the edges of the platesl 22 are held against the sti ening member and the joint sealed are the same as those illustrated in Fig. 2 and need not be described again.'

Preferably the edges of the plates 23 on the interior of the casing are spaced apart a distance somewhat greater than the width of the head 14 of the stiffening member and the -layer of heat-insulating material opposite this space may be continued as by a block 24 of some suitable heat-insulating material or may be filled with a mass of plastic insulation.' The space between the edges of the plates 23, 23 maybe'covered by an auxiliary covering plate 25 which may be fastened to one of the plates 23. Where the casing is accessible from its interior side, it is obvious that the entire casing may be assembled before the block 24 is placed in position and covered bythe auxiliary plate 25.

Preferably the plates 22 and 23, with the insulation 21 between them, are formed into panels, held together by bolts 26V in the usual manner, with a washer or packing 28 between the metallic washer 27 and the adjacent plate.

The panels are readily moved into place fromy the exterior because of the cutting-awayof the plates 23 to form an opening wider than the head 14 of the fixed stiffening member 13.

rate hat metallic plates, members extending along said plates,` each of said members having a portion extending between the adjacent edges of a pair of plates and an enlarged head on one side of said plates, a packing at the joint between said edges and said niember, means Vto hold the edges of said plates against said head and the packing against said plates and the body kportions of said members, said means comprising a metallic bar extendingalong said packing yparallel to the joint, and means, connected to said inember, to press said metallic bar toward saidy plates and toward said body portion.

l 2. A casing comprising a plurality of separate flat metallic plates, members extending alongsaid plates, each of said members havf ing a portion extending between vthe adjacent edges of a pair of plates and an enlarged head on one side of said plates, a packing at the joint between said edges'and said member, meanslto hold the edges of said plates against said head and the packing against said plates and the body portions of said members,A saidmeans comprising a first metallic bar extending along rsaid packing parallel to the joint, a second bar having one end resting against said body portion and the other end resting on said iirst bar, and a pressure device connected to said member to force said second bar and said first bar toward said plates and toward said body portion.

3. A furnace casing comprising a plurality of separate fiat metallic plates, members extending along said plates, each of said members having a portion extending betweenl the adjacent edges of a pair of plates and an enlarged head on one side of said plates, barsextending along the opposite sidesof said plates, packing material interposed between said bars and said members and between said bars and said plates, and clamping means for forcing said bars towards said plates and said members and ksaid heads against said plates whereby substantially airtight joints are formed.

4. A furnacecasing comprising a plurality of separate flat metallic plates, members extending along said plates, each .of said membersliaving a portion extending between "rec the adjacent edges of a pair of plates and an v enlarged head onone side of said plates, a packing at thejoint between said edges and said member,y and means to. hold the edges of said plates against said head and the packing in the joint between said member and said plates whereby said casing is rendered air tight. j' 1 n 5. A furnace casing comprising a plurality of separate metallic plates, members extending `along said plates, each of said members having a portion extendingbetween the adj acent'edges of a pair of plates andan enlarged head on one side of said plates, bars extending substantially parallel to said plates and "ics v iio on opposite sides of tlie'joint between the edges thereof, packing means interposed between said bars and said plates, and clamping means acting between saidmembers andthe respective bars andconstructed andarranged iac to create pressure between eachfof said bars and the associated member Vand plate.

6. A furnace casingcomprisinga plurality',

of separate metallic plates, members extending along said plates, each of said members havinga portion extending between the adjacent edges of a pair of platesand an en- I larged head on one side of said plates, bars Y extending substantially parallel to said I Y f plates and on opposite sides of the joint between the edges thereof, a packing strip loc-ated at the joint between a plate and thel associated member, and means comprising said bars for exerting pressure against said y strip in the direction of the head and of the extending portion of the member, whereby the joint between said plate and said associated member is sealed.

7 A furnace casing comprising a plurality of separate metallic plates, members extending along said plates, each of said members having a portion extending between the adjacent edges of a pair of plates and an enlarged head on one side of said plates, bars extendingV substantially parallel to said plates and on opposite sides of the joint between the edges thereof, a heat insulating pad of yielding material interposed between each of said bars and the associated plate and member,

' and clamping means constructedand arv ranged to force each of said bars against said pad in the directions of the associated plate and member'and said head against the oppo- `site sides of said plates.

PERRY CASSIDY.

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