DE8022740U1 - FIRE-RESISTANT SHEATHING OF INSULATED MOLDINGS FOR VERTICAL SUPPORT LINKS IN HEAT TREATMENT OVENS - Google Patents

Description

Refractory sheathing made from molded insulating parts for vertical support members in heat treatment furnaces

The invention relates to a refractory casing made of molded insulating parts for vertical support members, in particular standing tubes, so-called uprights, in heat treatment furnaces, in particular uhter-fired push and walking beam furnace, consisting of an inner layer surrounding the support members Fireproof, fibrous insulating layer and an outer layer surrounding it in positive engagement with one another standing refractory molded parts of the same height.

In modern heating furnaces, a wide variety of insulation systems are used to protect metal structures, such as slide rail tubes, Crossing pipes, lifting or riser pipes, standing pipes and other support members in pusher furnaces, beam hearth furnaces, walking beam furnaces and the like., when it comes to supports, the movable and stationary horizontal Bar goes, provided. Both the horizontal and vertical tubes are usually water cooled. About the heat losses To reduce the furnace and to increase their stability, they are provided with refractory coatings. These are subject to high and changing temperatures, repeated shocks, vibrations and the formation of scale and deposits and occasional damage from metal or

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Scale parts. They must therefore be interchangeable. For this purpose and to enable easy assembly, they are made from molded parts built up.

There are known refractory sheaths of various training for the purposes mentioned. A casing uses the initially mentioned molded parts of the same height, which have hook-shaped projections and recesses on their side surfaces in order to connect them to one another in a form-fitting manner. The molded parts are otherwise trapezoidal in order to be able to enclose a pipe. For pipes with very different diameters, molded parts of different trapezoidal shapes are required. Only if the hook-shaped positive connection is formed with a lot of play or if circular grooves are provided in one side surface and round wire-shaped projections which can engage in the corresponding grooves are provided in the other side surface, a greater angular mobility of the molded body is given, which allows adaptation to different pipe diameters when the width of the molded parts is small. However, this design has the disadvantage that with large game which inside ^ back to ^Q Srfnente. Gap between adjacent molded parts is not optimal. In addition, a very large number of shaped stones must be laid during assembly, with the result that there are many gaps that have a lower insulation value than the rest of the shaped parts. The inner layer is held resiliently compressed by the outer layer in such a way that it fixes the molded parts in their position by means of locking connections of adjacent molded parts that are under tension in the circumferential direction due to the counter-pressure achieved by the compression. This refractory sheathing is known from DE-AS 17 58 785. Another known refractory sheathing for standing pipes uses wider, also arcuate shaped parts, which, however, have recesses extending radially from the front to the inside on the upper side

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tu and has projections, so that before jumps of adjacent Formic
; <divide by recesses an offset above

The molded part overlap to create a form-fitting connection!) ;; to manufacture tape. Depending on the diameter of the to be isolated I support tube, the molded parts must have different dimensions <f, since their curvature is adapted to the curvature of the pipe.

A variety of different shaped bricks must therefore be kept in stock in order to be able to adapt to different tasks. In addition, the production is complex, since different shapes are reserved for the various molded parts have to.

There are also sheaths of this type, made up of molded parts of different heights, which have nits on two abutting sides and have springs on the other two abutting sides so that they can be laid in a composite.

Sheathing

The same applies to emej ^ from the curvature of the to be isolated Upright pipe or other pipes adapted curved shape! '' ■ parts, in which additionally in the axial direction of the to be isolated. " interlocking locking mechanism acting on the pipe Bindings in the form of step-shaped paragraphs with forwards and backwards:] jumps are provided. Moldings to be arranged one above the other

j: can have tongues on their upper side and grooves on their lower side. The production and storage of these molded parts is also very expensive. Insofar as the molded parts have radial recesses or recesses on their top and bottom

; have that the side protrusions and moldings of an in

Overlap in the longitudinal direction of the adjacent layer, the result is

; Disadvantage that the notch stresses in the corners of the recesses

■: ■ can become so large that cracks occur in use. Here-

;: the association is endangered. First an axially parallel groove

; and spring formation on the inside of the recesses

- bordering protrusions creates a certain operational reliability here

I mean.

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All of the known sheaths mentioned have the disadvantage that they are different for adaptation to pipes to be insulated A large number of different diameters and double tubes (support tubes running parallel to one another) Molded parts must be made in different shapes.

The invention is based on the object of specifying a casing made of molded parts. those with fewer numbers different molded parts and their production with less effort for a variety of different support members is possible.

To solve this problem it is provided according to the invention in the aforementioned refractory casing that the Molded parts only equilateral angle pieces with different leg lengths and straight spacers of different types Width include that all molded parts on two abutting side surfaces grooves and on the other two abutting one another Side surfaces have springs and that the inner layer is made up of adjusted, essentially rigid, flat Isolation plates is formed.

The inventive design of the molded parts makes it possible to adapt to almost all practical tasks with only 5 to 6 different molded parts. Elbows of different leg lengths, preferably with only two different leg lengths, enable all pipes to be grasped, including double pipes, with spacers of different widths being used to adapt to the diameter. The angle pieces of different leg lengths make it possible to avoid continuous joints parallel to the pipe axis. Rather, the molded parts can be laid in a bond J, ie the joints parallel to the pipe axis are from C

ψ Part layer to molded part layer offset from one another. The win | Elbow pieces also allow for the inner layer of insulation f

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the use of straight insulating panels that only need to be cut to the appropriate width. The use of special / In particular, soft mats to be wrapped around the support tubes, which require special fastening, in order not to Slipping together in a whisper is not necessary. Rather, one can essentially s ^ lS-'rt ^ Y ^ lii & fjlatten use that can be placed on top of each other without the risk of these shifting axially into each other.

The spacers expediently have a width that is twice the difference in the leg lengths of the two Contra-angles of different leg lengths are the same. This allows the elbow pieces with a large leg length small pipes are immediately surrounded, while in the adjacent layer then elbows with a small leg length be used to achieve an offset of the longitudinal joint, with the remaining space through a single Intermediate piece is bridged.

Another embodiment of the invention provides that other spacers have a width that is an integer Have multiples of the width of the aforementioned smallest intermediate piece. This allows larger pipes to be used Wrap a few different molded parts in the association, so that only a few longitudinal joints arise.

One embodiment of the invention provides that the molded parts Longitudinal ribs on the inside to keep the insulation panels apart exhibit. As a result, the insulation is designed appropriately and a certain amount of tension can also be achieved « and the thermal resistance is increased.

The angle pieces are preferably rounded on the inside and outside Corners designed to reduce the risk of damage.

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For the production of the casing from the angle pieces of different Leg length, preferably two different leg lengths, and intermediate pieces of different Width, only a single shape (base nut shape) is required. The cavity that will meet with the refractory material is, is designed such that at the same time either two angle pieces or two or three intermediate pieces can be produced. This is the shape for the two angle pieces connected by a straight piece for the production of an intermediate piece and are the other two shaped legs extended so that at least one larger spacer can be added. Be in manufacture now the molded parts to be produced by inserting into the mold the size of angle pieces or intermediate pieces laterally limited. Two spacer inserts are used to limit the angle piece to be produced and vice versa Elbow and, if necessary, spacer inserts to delimit the cavity of the spacers to be produced. So it is only a single basic shape is required, which is adapted to the various molded parts by means of inserts.

With the casing according to the invention from the special molded parts basic pipes with an outside diameter of e.g. 89 - 220 mm (i.e. practically occurring dimensions),

e.g.

Square tubes of 100 χ 100 and 100 χ 200 mm as well as double or Sheath tandem pipes from the individual pipes mentioned.

Due to the reduction in manufacturing cost because of the simplified Form training, which allows the restriction to only a few different molded parts, can be done quickly Achieve availability of molded parts with reduced inventory.

These advantages are also given in a further embodiment of the casing, with a pipe casing on the upper

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side overhanging, roof-shaped, up to close to the support member reaching cover hood made of molded parts. Such hoods made of semicircular \. shaped moldings are known. The invention now proposes that the molded parts of the cover hood are designed as isosceles angle pieces (same or different leg lengths) and, if necessary, straight intermediate pieces, and that these molded parts on the underside over the top of the molded parts of the support member casing in a form-fitting manner.

j§ have gripping recess. The molded parts of the cover are expediently step-shaped with on the side surfaces form-fitting interlocking projections and recesses (cranked).

By providing such a covering hood at the upper end of the casing, its stability against vibrations is increased. The ^one rational mechanical production of molded parts as well as the moldings of the pipe coating is cost possible. Due to the special construction of the hood and a corresponding ¹ choice of material, the pipe casing is protected against the trickling in of foreign matter, scale and slag.

All molded parts have a very high degree of dimensional accuracy and accuracy of fit, as only one basic production form is used.

By changing from a round casing to a square one or rectangular sheathing, the insulation of the standing pipes is improved and the service life of the sheathing is increased. These advantages are not outweighed by the higher use of materials.

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Two embodiments of the invention are explained in more detail with reference to a ψ drawing in which shows: |

Fig. 1 is a perspective view of a vertical tube with § partially visible inner layer and an outer layer! .. " from molded parts, f

FIG. 2 shows a casing corresponding to FIG. 1 for a dik-S keres standpipe, J.

Fig. 3 shows a cross section through a basic form for mother § the production of the moldings of the sheath of FIG. 1 and 2,

? ^; Fig. 4 is a view of a pipe casing with a cover |

hood, '|

Fig. 5 is a plan view of the cover according to Fig. 4 and

Fig. 6 is a view of a molded part of the cover according to f

Figures 4 and 5. h

In Fig. 1 and 2 is a standing tube (post) of a heat treatment \. lung furnace recognizable with a two-layer refractory;. Sheathing from an inner layer of four rectangular trains->

commercially available "_ ', cut, starrenylsolierplatten prepared j in the square 11 and a surrounding outer layer of a form fit in engagement with each other refractory shape> ■ 12 share the same height there. There are three different ^T before molded parts 12 are provided, namely isosceles angle pieces 1 and 2 with different leg lengths, of which the angle pieces 1 used in the second molded part position | are, have a greater leg length than the angle pieces 2, which are used in the first and third of the illustrated molded part layers. Accordingly, between the angle pieces 2

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Intermediate pieces 3 are provided with a shorter leg length. Since the Angle pieces 1 directly abut one another with their side surfaces, the width of the narrow intermediate piece 3 is the same Twice the difference of the bar slopes of the two elbows 1 and 2.

The casing of FIG. 2 is used to coat a larger one Upright tube 10. In principle, it is constructed in the same way as that according to FIG. 1, but between the angle pieces 1 greater leg length as well as intermediate pieces 3 and 4 provided between the angle pieces 2 smaller leg lengths, of which the width of the intermediate pieces 3 corresponds to that of the intermediate pieces 3 of the casing of FIG. 1, while the width of angle pieces 4 between angle pieces 2 of smaller leg length twice the width of the narrow ones Intermediate pieces 3 corresponds. The insulating plates 11 are also cut wider than for the casing according to FIG. 1.

The molded parts each have a groove 7 and extending parallel to the edge on their one side 5 and their underside 6 ″ on its other side 9 and its upper side 8 each have a corresponding spring 14. This means that all molded parts are radial Direction secured and a bond of molded part layer to molded part layer is effected. On the inside, the Molded longitudinal ribs 13 as spacers for the Isolicrplatten 11 on. This creates an air cushion between the Moldings and the insulating panels 11. Another air space arises between the pipe and the corners of the insulation panels. This is the insulation effect of the sheathing a round insulation adapted to the round circumference of the pipes with a total of adjacent insulating mat increased considerably.

The angle pieces have rounded corners on the inside and outside, as can be seen in the figures. For the production

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a single mold 15, the cross-section of which is used for the molded parts Fig. 3 shows. An arcuate recess is formed in it. This has the shape of an elbow 1 with a large Leg length, an intermediate piece 3 adjoining downwards, an intermediate piece 4 adjoining towards the side double width, an angle piece 2 with a short leg length, which continues to be connected to the side, and one in turn subsequent intermediate piece 4 with twice the length as that of the narrow intermediate piece 3. The size of the subsequent The mold space could also correspond to that of an intermediate piece with three times the width of the narrow intermediate piece 3. The embodiment shown has three inserts 17 the size of the intermediate parts 3 and 4. This creates press rooms 18 for an angle piece 1 and 19 for an angle piece 2 delimited. By filling in rooms 18 and 19 with "accordingly molded inserts and removal of the inserts 17, three mold spaces for intermediate pieces 3 and 4 are formed. Man thus recognizes that all molded parts can be produced with a single basic shape, if the corresponding Deposits are used. This simplifies the production considerable.

In a conventional embodiment of the molded parts, these have a thickness of 70 mm, while the longitudinal ribs 13 are a Have a height of 10 mm. The insulating plates 11 can be 20 mm thick. The insertable insulation panels -11 withstand higher temperatures than those provided for other jackets soft insulating mats or pressed half-shells, which is why the life expectancy of the casing is increased, if the molded parts are partially destroyed or particularly badly eroded due to special influences. The assembly is in relieved in each case.

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: The upper end of the · from the mold parts 12 formed Iso-'iii 'lierturms suitably forms a cover 20 that $ the mold parts inwardly and outwardly overhangs. : "A Abfe cover hood for a casing according to FIG. 1 can consist of four

) | Molded parts 21 exist, which are roof-shaped on the top

I are formed, but otherwise an isosceles angular

I form a piece that has rounded outer edges and a quarter

P circular inner wall. The bevel and cantilever

I ensure that any scale does not build up or

Ψ - if the furnace is running liquid - the slag on the house

: the overhang can drip off without the underlying fire

i fixed molded parts 12 to damage. The hood is therefore

Ä moderately from a liquid slag resistant Refractory material made.

To exclude a divergence of f Isolierturms formed from the mold parts 12 with certainty is the covering; dome designed so that the four or more mold parts by ij: a cranked joint are held in the composite 22, or a \: representing locking connection interlocking similar side I training. For this, the moldings of the Abi are covering hood 20 on the side surfaces with staircase-shaped form fit% sig interlocking projections 23 and recesses |; educated. In order to ensure a good bond with the underlying I molded parts 12, each angle piece 21 '{has on the underside one of the upper contour of the molded parts 12; corresponding recess 25, the width of which corresponds to the thickness of the molded parts 12. A circumferential groove 26 corresponds to the tongue 14 on the upper side of the molded parts 12. The circumferential recess 25 and the tongue-and-groove connection with the molded parts 12 provide absolute locking of the insulating tower in a desired position. The air gap 27 between

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The hood and the standpipe 10 should prevent foreign matter from trickling in to prevent, not too large or not too small, so that the vertical tube 10 vibrating during operation does not counteract the cover 20 strikes. To cover sheaths for larger pipes and double pipes, between the elbows 21 corresponding intermediate pieces are inserted, as is the case with the sheathing from the molded parts 12 in the form the intermediate parts 3 and 4 is provided.

To produce the molded parts 21 for the cover hood can also a single steel base nut shape can be used. The desired leg length can be achieved with appropriate inserts or the desired inner diameter can be achieved. The advantages of the molded parts apply to the production of these molded parts accordingly.

Claims (8)

1. Fireproof sheathing made from insulating moldings for vertical Support members, especially standing pipes, in heat treatment furnaces, especially under-fired push and walking beam furnaces, consisting of an inner layer surrounding the support members a fireproof, fibrous insulating layer and an outer layer surrounding it from each other in a form-fitting manner engaged refractory molded parts of the same height, characterized , that the molded parts (12) only isosceles elbows (1, 2) with different leg lengths and straight spacers (3, 4) of different widths encompass that all molded parts (12) on two abutting side surfaces (5, 6) have grooves (7) and on the two other abutting side surfaces (8, 9) tongues (14) and that the inner layer is formed from adjusted, substantially rigid, flat insulating plates (11). / 2 53 948 /·.."·. "■ • r r a] • · «ti I C f «· <I < 1 2. Sheathing according to claim 1, characterized in that only angle pieces (1, 2) are provided with two different leg lengths. ' 3. Sheathing according to claim 2, characterized in that that it comprises intermediate pieces (3), the width of which is twice the difference in the leg lengths of the angle pieces (1, 2) equals. 4. Sheath according to claim 3, characterized , p; that it comprises intermediate pieces (4), the width of which corresponds to a whole numerous multiples of twice the difference of §F the leg lengths of the elbows (1, 2) are the same. 5. Sheath according to one of claims 1 to 4, !: characterized, that the molded parts (12) on the inside longitudinal ribs (13) to hold the insulating plates (11) apart. 6. Sheath according to one of claims 1 to 5, S characterized in that that the angle pieces (1, 2) have rounded corners on the inside and outside. 7. Sheathing with an upper one, the one below; Moldings protruding roof-shaped, up close to the support member covering hood made of molded parts, according to one of claims 1 to 6, characterized in that that the molded parts of the cover (20) as isosceles angle pieces (21) and, if necessary, straight intermediate pieces are trained / 3 * Jt-. *! Ίι etc < . . ··><t I · · '·' -I »» ♦ ι ι ι ι ι ι c ι and that these molded parts form a positive fit on the underside of the top of the molded parts (12) of the support member casing have overlapping recess (25). 8. Sheath according to claim 7,
characterized in that the shaped parts of the covering hood (20) are step-shaped on the side surfaces with interlocking projections and recesses (23, 24) (cranked).