JPH0435002Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to the structure of a fire-resistant packing material that is flexible and compressible under pressure.

BACKGROUND ART Conventionally, nozzle stopper systems, slide valve systems, immersion nozzles, and the like have been used in steel manufacturing and ingot factories to adjust the flow of molten steel.

These molten steel flow regulating fireproof structures are used as assembly structures for various fireproof members.

Refractory mortar has conventionally been used to join and fix these refractory members. For example, a molten steel pot,
Slide valves are used for tandaishi pots, etc.
Between nozzles or between sleeve and stopper head,
For joints, refractory mortar has been applied between the upper part of the stopper and the fixed retaining brick, and between the stopper hardware for gas-injected stoppers.

Problems to be Solved by the Invention However, applying refractory mortar is labor-intensive and takes a long time to dry and bond. The high temperature during use causes seizure between fireproof members or seizure between metal fittings and fireproof members, so if some of the members are damaged during use, it is difficult to replace only the damaged parts.

In addition, the mortar parts of the joints of structures joined with refractory mortar have poor molten steel and slag resistance, which often causes steel leakage accidents.

Furthermore, there are drawbacks such as insufficient airtightness and entrainment of air in the case of a submerged nozzle, and improvements are desired.

Therefore, the present applicant has improved the conventional so-called preform packing, and has created continuous protrusions parallel to the installation surface on part or all of the surface of the packing material, which is fire-resistant, flexible and compressible under pressure. We proposed a fire-resistant packing material (Japanese Patent Application Laid-Open No. 62-259663) with However, especially at the joint between the slide valve and the collector nozzle, erosion caused by air entrainment or intrusion of molten steel sometimes became a problem.

Therefore, the present invention aims to further improve the airtightness of the joint to eliminate such troubles.

Measures to Solve the Problems In view of this situation, the inventors of the present invention have conducted various studies and have focused on the point that airtightness can be further increased by simply slightly increasing the protrusion at the bottom of the outer peripheral surface. After much research and development, we were able to complete this invention.

EXAMPLES The present invention will be described in detail below based on figures showing several examples of implementation of the present invention.

FIG. 1 is a longitudinal cross-sectional view of an example in which the protrusions of the present invention are provided on the outer peripheral surface of the packing material, and a vertical cross-sectional view showing the mode of use thereof using imaginary lines.

In these illustrated examples, reference numeral 1 denotes a fire-resistant packing material, which is made of a known material such as inorganic refractory powder, inorganic fiber, and synthetic resin emulsion by the present applicant (Japanese Unexamined Patent Application Publication No. 55-117).
109550) may be used. 2 is a slide plate, and 3 is a collector nozzle set under it. Generally, the general shape of the refractory packing material 1 is such that the vertical section is slightly tapered so that it is sandwiched between the slide plate 2 and the collector nozzle 3, and the outer diameter of the upper side is 170 mm, and the wall thickness is 170 mm. Approximately 5 mm, outer diameter of the lower side is approximately 130 mm, and height is approximately 40 mm. Numerals 4 and 5 are ring-shaped protrusions provided on the outer surface of the ring, and generally three protrusions provide the best sealing effect, and numeral 4 is the upper two slightly smaller semicircular protrusions with a radius of about 3 mm; 5 is the lowest protrusion, and its size is preferably about twice the cross section of protrusion 4. This is because if it is less than 2 times, it will not expand sufficiently when pressed and deformed, so the sealing effect will be low, and if it is more than 2 times, it will be too much and will not deform evenly, causing air entrainment. .

As mentioned above, the protrusions 4 and 5 are provided on the outer circumferential surface of the packing material of the present invention in contact with the refractory member, and the cross-sectional shape thereof may be semicircular, elliptical, triangular, or square.

By using this product, the air seal defect rate has been reduced to 50% from 0.1% to 0.05%.
The efficiency of steelmaking operations has improved.

By using the fire-resistant packing material of the present invention, better packing properties can be obtained compared to the packing material proposed by the applicant mentioned above for the following reasons.

When fitting a fireproof member through a fireproof packing material, the protrusions of the packing material are deformed, but this deformability is possible even under pressure that does not cause deformation of the packing material itself, so the refractory member Even if there is a slight inclination during bonding, it can absorb the stress deviation and achieve a perfect seal. In addition, the application range of mounting pressure can be widened, air seal failure and steel leakage accidents due to inability to be mounted can be prevented, and the fitting work can be easily performed and the working time can be greatly shortened.

Note that among the protrusions, those with a large cross section are deformed and expanded over a considerably wider area when pressed by a nozzle or the like, compared to other small protrusions. Therefore, even if the gaps between the joints are not uniform, the gap will evenly spread through the gaps, completely blocking air entrainment and completely eliminating problems such as abnormal melting damage caused by the intrusion of molten steel.

Effects of the invention (1) Even if there is a fairly large inclination when joining fireproof members (slide plate and collector nozzle, etc.), it is possible to absorb the stress deviation and create an almost complete seal to prevent molten steel from entering. As a result, steel leakage accidents are almost eliminated.

(2) It is possible to widen the range of mounting pressure (the pressure exerted by conventional fitting alloys such as bolts and nuts), and it is possible to prevent accidents due to poor mounting.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the packing material of the present invention and its usage using imaginary lines; in the figure, 1...
Fire-resistant packing material, 2...Slide plate,
3... Collector nozzle, 4 and 5... Tujo.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Of the ring-shaped protrusions 4 provided on the outer peripheral surface of the fire-resistant packing material 1 in the shape of an inverted truncated right cone, the lowermost protrusion 5 has a cross section that is larger than the others. A fire-resistant packing material with protrusions on the surface, which is twice as large. 2. The fire-resistant packing material having protrusions on the surface according to claim 1, wherein the protrusions 4 and 5 are semicircular, oval, triangular, quadrilateral, trapezoidal, or other polygonal.