DE7530282U - FIRE RESISTANT VENTILATION DUCT - Google Patents

Description

Grünzweig + Hartmann GM 804

and Glasfaser AG

67 Ludwigshafen am Rhein ¹² 9-1975

Bgrn. Grünzweig-Str. 1-47 TE-ND2 f-ho

Applicant: GRl) NZYiEIG «- HARTMANN UND GLASFASER AG 67oo Ludwigshafen am Rhein

Fire-resistant ventilation duct

The innovation concerns a fire-resistant ventilation duct consisting of a sheet metal duct on the outside Fiber insulation panels are arranged and attached by an adhesive. There are sheet metal lines and cannula known whose Mineraifaserplattenbeklr-; j dung with organic Glues are attached. The organic glue will only used as an assembly aid, as they set quickly, However, it cannot withstand the high temperatures of fire, so an additional mechanical fastening of the Mineral fas ο rdämiuplat Lon is necessary.

The inorganic, predominantly hydraulic adhesives known per se, for example based on cement, are not or only rarely used because of their long setting times and poor adhesion. The usual V / No. sergln adhesive meet the temperatures required in accordance with DIN 4102 for fire protection class V 90

7530282 22.oi.76

- 2 - GM 80 * 4

from approx. 1000 C not:;. Country. Because of their relative The low shrinkage effect is caused by the water glass glue sintering and shrinking of the mineral fiber boards even at temperatures of 600 ° C to 700 ° C.

According to the contract, these disadvantages are to be eliminated in that the sheet metal duct is provided with fiber dam plates. is lined with a fire-resistant and heat-absorbing inorganic adhesive:; are ligt. The adhesive consists of a mixture of alkali silicate solutions and finely divided metal hydroxides and / or carbonates which, in a temperature range of 150 - 1100 C, form metal oxides with elimination of water or carbon dioxide, the melting points of which are above 1100 C. The absorption is based on the fact that the glue contains substances in its composition which, when exposed to temperature, are subject to endothermic decomposition in which worms are consumed. By appropriate selection and coordination of these substances with one another, it was surprisingly possible to obtain an adhesive with good strength properties and excellent temperature behavior. The durchgeführteil fire tests according to DIN 4102 "fire-resistant ventilation ducts with fire resistance class L 90" showed that by almost continuously carried decomposition of silicates and additives · during the temperature increase to about 1000 ⁰ C and this took place dehydration and evaporation of HPO and CO-, so much thermal energy has been consumed that the heat transfer through the insulating panels has been considerably reduced.

In addition, is effected by coating of the mineral fibers during application of the adhesive neuerungsgenässen located under the adhesive layer on the insulating plates that in ". Temperature exposure above 600 ⁰ C a Keramisierungseffekt of the mineral fibers occurs, v / hich sintering of the

7530282 22.oi.7i

GM 804

Isolation plate) ^ prevented in the temperature range of over 1000 C. In a preferred embodiment, the adhesive should therefore envelop the fibers at least at the boundary layer and not just around the surface to be glued. From a technical point of view, it would be advantageous if the adhesive ^{enveloped all the fibers of the 1} mineral fiber 3 earth pla Ue, but economic interests stand in the way.

In a further embodiment, the mineral fiber boards should preferably be applied in at least two layers and with the heat-absorbing adhesive attached. Because the glue not only at the boundary layer between sheet metal duct and thermal insulation board, but also between the individual layers The mineral fiber insulation panels are applied, there is a higher heat absorption and thus a better fire behavior in the required class with significantly lower Insulation panel thickness.

With consistent implementation of the innovation concept, the mineral fiber insulation should preferably also be on the outside puttied off the heat-absorbing adhesive and gfs. be surrounded with a sheet metal jacket. The sheet metal jacket cover the ventilation duct only serves to protect the thermal insulation from moisture and mechanical influences.

For the adhesive, silicate solutions are preferred, the soda or Potash water glasses with a high SiOpi ratio NapO or SiOp: KpO of, for example, 3: 1 or more. Suitable additives are calcium, magnesium and Zinc carbonates as well as aluminum and barium hydroxide. In order to improve the plasticity and elasticity, the Adhesive Additions of asbestos fibers or high-melting glass or mineral fibers and / or binding clays (bentonite) added, will. In general, adhesives are preferred whose composition is in the following weight ranges:

Sodium silicate solution with ca-UO wt? S solid

GH 804

UO - 75 parts by weight

Aluminum hydroxide or bauxite

25-60 parts by weight

Short fiber asbestos

0-15 parts by weight

If necessary, the setting and hearing of the innovative adhesive can be accelerated by adding the hard substances known per se for V / aterglar. These hard materials include metal salts of 6- hydrofluoric acid, hydrofluoric acid, fluorotitanic acid, as well as borates, phosphates and acetates.

To prevent the adhesive from penetrating into the; Mineral fiber boards To improve, surface-active agents can be incorporated in its manufacture. For this purpose Suitable surface-active agents are, for example: fatty alcohol sulfonates, alkyl faryl sulfonates or ethylene oxide condensates. Further details of the innovation can be found in the drawing and in the following description.

They show: FIG. 1

Figure 2

a perspective of a part
an air duct;

the detail a) corresponding to Figure 1 in the front view

The innovation consists essentially of a sheet metal duct 1, the duct being round - or as shown - may consist of a square tube or a polygonal tube, on the outside of which mineral fiber insulation panels 2 are arranged which are held with a heat-absorbing adhesive 3 on the sheet metal channel. The mineral fiber insulation panels

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GH UO ^ Π

solion multilayered unu offset from one another - as can be seen from Figure 2 - are applied so that gf v ,. Joints that arise between the individual plates are covered by the η borrowed 3 th La ^ e. Air: · External mechanical protection can be provided by a v / eiLeror Dleclirnai.tol U. The adhesive ί is to be applied at least on the boundary layer between the tubular sheet metal duct and the first thermal insulation layer, but preferably the heat-absorbing adhesive should also be provided between the individual layers, wodu.ch reduces the thickness of the thermal insulation layer when the same fire protection class is required can be.

Claims (3)

-G- GM 804 protective imperfections 1. Fire-resistant ventilation duct, consisting of a sheet metal duct, en whose Aus_, enseite mineral fiber insulation panels are arranged and fastened by an adhesive, characterized in that the sheet metal duct (1) is clad with mineral fiber insulation panels (2), which are covered with a fire-resistant and heat-absorbing inorganic adhesive (3) are fixed, v / obei the adhesive (3) consists of a mixture of alkali silicate and finely divided Hetall hydroxides and / or carbonates, which in the temperature range of 15O ⁰ C to 1100 ⁰ C under Elimination of water or carbon dioxide form metal oxides, ι
consists. form with melting points above 1100 C, 2. Fire-resistant Lüfi.ungsleitung according to claim 1, characterized characterized in that the adhesive (3) envelops the fibers at least at the boundary layer. 3. Fire-resistant ventilation duct according to claim 1 and 2, characterized in that the mineral fiber insulation panels \ (2) applied in at least two layers and with the heat absorbent adhesive (3) are attached. U. Fire-resistant Lii Ctungsleitung according to claim 1, 2 p, fr ,. 3, marked thereby, dnsr. din mineral fiber diminution (2) nut-sided with the irmea-absorbing adhesive abospnchiol I. and is preferably surrounded by a sheet metal mount], (M.