Seal for a joint or juncture – Seal between fixed parts or static contact against...
Reexamination Certificate
1999-04-29
2001-08-28
Dayoan, B. (Department: 3628)
Seal for a joint or juncture
Seal between fixed parts or static contact against...
C277S412000, C222S591000
Reexamination Certificate
active
06279915
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tubular refractory channel, in particular a refractory nozzle, serving as a flowthrough for liquid metals, in particular liquid steel, with the channel being insertable into a thermally insulating outer lining and the channel and the outer lining being, if appropriate, connectable with a refractory mortar layer.
The invention relates furthermore to a method for packing joints between two refractory parts, in particular rotationally symmetrical parts, disposed one within the other which can be connected with a refractory mortar or cement, against the penetration of liquid metal, in particular liquid steel.
2. Description of Related Art
DE 196 51 534 A1 describes such a device. A refractory pouring sleeve as a wear part is slid into an insulating intermediate sleeve. A cement layer is provided in the joint between the sleeves. The pouring sleeve is heated inductively to casting temperatures. Thereby the cement layer is also brought nearly to casting temperatures. The result can be contraction, which leads to the fact that after a certain degree of wear, liquid metal can enter the space between the sleeves. This is undesirable. In particular, in the case of inductive heating of the pouring sleeves, liquid metal itself which has penetrated into the joint becomes coupled to the electromagnetic field of the inductor whereby it is additionally heated and liquified so that the danger exists that the cemented joint is under strong corrosive stress, wears prematurely and, consequently, further liquid metal can penetrate into the joint. Furthermore, the danger exists of a breakthrough of liquid metal at the other end of the joint. The liquid metal that has penetrated into the joint, incidentally, shields at least partially the pouring sleeve against the electromagnetic field of the inductor such that its intended heating is impaired.
SUMMARY OF THE INVENTION
It is the task of the present invention to propose a channel and a joint packing of the above described type in which liquid metal is prevented from penetrating into the joint.
The above object is achieved according to the invention by constructing the thermally insulating outer lining so that it overlaps the front face at the metal inflow-side of the tubular channel in the axial and radial direction so that the front face, on the one hand, is protected and, on the other hand, the joint between channel and outer lining, which can be filled with a refractory mortar, is not accessible in the aural direction of the main flow of the liquid metal such that no significant quantities of the liquid metal can penetrate into the joint.
In a preferred embodiment of the invention, the joint between the channel and the outer lining in the region of the front face of the channel is at least singly bent at an angle in the manner of a labyrinth in the approximately radial and approximately axial direction of the channel. This lengthens the joint and makes the penetration of liquid metal difficult in particular if it is filled with mortar or cement since the liquid metal would have to enter into the joint against the direction of the main flow, which is not to be anticipated.
In a preferred embodiment of the invention, a refractory cord and/or a refractory textile tape is wound around the channel. The mortar volume in the joint becomes smaller corresponding to the volume of the cord and/or the textile tape such that the contraction of the mortar has a lesser effect. A material can be used for the cord and/or the textile tape, which contracts significantly less than mortar and, unlike mortar, does not become hard and brittle by sintering but rather retains a certain elasticity by fissuring throughout. The cord and/or the textile tape preferably comprises substantially carbon.
A method of the above-described type is distinguished thereby in that onto the outer diameter of a second refractory part (channel) slidable into a first refractory part (outer lining) an encircling refractory cord or an encircling refractory textile tape is applied and that subsequently the two parts are slid one above the other in a mortar and/or cement bed potentially placed between them such that the first refractory part overlaps, as a thermally insulating outer lining at the side at which the metal flows in, the front face of the second refractory part (channel).
Therewith a simple method is created with which the joint is packed such that even if the mortar or cement contracts, virtually no liquid metal penetrates into it.
Further advantageous embodiments of the invention are evident in the appended claims and the following description of an exemplary embodiment.
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Bruckner Raimund
Grimm Daniel
Hellermann Robert
Kapoor Jivan
Dayoan B.
Didier-Werke AG
Miller William L.
Wenderoth , Lind & Ponack, L.L.P.
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