JPH0572956U - Immersion tube for vacuum degassing equipment - Google Patents

Abstract

(57) [Abstract] [Structure, Purpose] The present invention has an outwardly facing flange 2
In a dipping tube for a vacuum degassing device, comprising a metal cylindrical body (1) having an inner cylindrical surface and an inner cylinder refractory arranged on the inner peripheral surface of the cylindrical body (1), The inner cylinder refractory locking portion (4) provided in the inner pipe is located within the range from the substantially central portion to the top in the height direction of the dip pipe, and the inner cylinder refractory (5) is divided into a plurality in the circumferential direction. And consists of one piece in the height direction,
The inner cylinder refractory (5) is characterized in that an engaging portion (8) for engaging with the locking portion (4) is provided on the outer peripheral surface of the inner tubular refractory material (5). The life of the immersion pipe is extended.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vacuum degassing apparatus dip tube used in a vacuum degassing apparatus such as a DH method or an RH method, and more particularly to a dipping tube for a vacuum degassing apparatus having an improved durable structure.

[0002]

[Prior Art]

 The vacuum degassing apparatus by the RH method has a structure in which a dip pipe is connected to the tips of two reflux pipes in the lower part of a vacuum chamber having an exhaust hole and an alloy addition hole. In this device, the dip pipe is immersed in the molten steel in the ladle, the vacuum chamber is evacuated, and the molten steel is sucked up by blowing an inert gas into the dipping pipe on the rising side, while the dipping pipe from the descending side is sucked. The molten steel is spouted out, and in this way the molten steel is circulated and refined. The improvement of the immersion tube of this type of device is disclosed in Japanese Utility Model Laid-Open No. 1-244442.

In the conventional dipping pipe, since the inner cylinder bricks are vertically stacked in three stages, the difference in thermal expansion of the inner cylinder bricks in each stage and the blowing of an inert gas for circulating molten steel The inner tubular brick is easily worn away due to melting damage of joints caused by, and this causes the inner tubular brick to fall off.

Further, in the dipping pipe described in the above-mentioned publication, the inner tubular brick is divided into a plurality of pieces in the circumferential direction and is integrally formed in the height direction. However, since the means for locking the inner tubular brick to the metal cylindrical body is at the lower part of the dip tube and the rear L-shaped notch is formed in the circumferential direction on the back surface of the cylindrical brick, it is not in use. The effect of preventing falling cannot be expected because cracks are likely to occur at the corners of the part due to the concentration of thermal stress.

[0005]

[Problems to be Solved by the Invention] In order to solve the problems of the conventional method as described above, the present inventor has a completely different idea from the conventional one, that is, the engaging portion between the inner cylinder brick and the metal cylindrical body. Is provided in the range from approximately the center of the dip tube in the height direction to the top, the cracks caused by the difference in thermal expansion and the penetration of molten steel are prevented.

[0006]

[Means for Solving the Problems]

 The present invention was developed as a result of various studies and experiments to solve the above-mentioned problems of the conventional method. The technical configuration of the present invention is a metal cylinder having an outwardly facing flange 2 1 and an inner cylinder refractory disposed on the inner peripheral surface of the cylindrical body 1, the inner cylinder refractory engaging portion 4 provided on the inner peripheral surface of the cylindrical body 1 in a vacuum degassing apparatus immersion pipe. The inner tube refractory 5 is located in a range from the substantially central portion to the top in the height direction of the dip pipe, and the inner tube refractory 5 is divided into a plurality of pieces in the circumferential direction and is made of a single piece in the height direction. It is characterized in that an engaging portion 8 for engaging with the engaging portion 4 is provided on the outer peripheral surface thereof, and by adopting such a configuration, the influence of heat is small and the life of the immersion pipe is extended.

A specific example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a vertical cross-sectional view showing an example of the dipping tube of the present invention, in which 1 is a metal cylinder having an outward flange 2 on the top, and the cylinder 1 is installed outward. A large number of locking studs 3 for irregular refractories are planted. Further, on the inner peripheral surface of the cylindrical body 1, the locking portion 4 of the integral-body inner refractory 5 is arranged independently or continuously within a range from the substantially central portion to the top portion in the height direction of the immersion pipe. It is set up.

Reference numeral 7 denotes an inner-cylinder refractory, which is divided into a plurality in the circumferential direction and is integrally formed in the height direction. These inner-cylinder refractories are internally provided on the outer peripheral surface of the cylindrical body 1. An engaging portion 8 corresponding to the locking portion 4 is provided.

The dipping pipe of the present invention is completed by assembling each member having the above-mentioned structure by a well-known means and applying an amorphous refractory material 6 on the outer circumference.

FIG. 2 is a side view showing another example of the one-piece inner cylinder refractory 5, in which a protrusion or a ridge 5 ′ is provided on the outer periphery of the top of the inner cylinder refractory and the inner peripheral surface of the cylindrical body 1 is provided. This is an example of engaging and fixing with a provided locking portion (not shown), and 8 is an engaging portion provided on the outer peripheral surface thereof, but it is not always necessary.

FIG. 3 and FIG. 4 show a series of developed views showing an example in which the inner cylinder refractory is made to have a vertical shape, 15 is a shape enlarged by a slight angle downward, and 25 is a shape slightly enlarged downward. This is an example in which the inner cylinder refractory is securely held by forming a tapered shape and constructing them by combining them as shown in the figure. The inner cylinder refractory may be provided with the locking portion 8, but it is not always necessary.

[0013]

[Effect of the device]

 (1) Since the metal cylinder and the inner cylinder refractory locking part are provided on the upper part of the immersion pipe, there is little heat effect, damage and molten steel penetration is less than in the conventional method, and the life of the immersion pipe is extended. Can be achieved.

(2) Since the inner tube refractory is integrally formed in the height direction, the construction is easy and the strength is excellent.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of the dip tube of the present invention.

FIG. 2 is a side view showing another example of the one-piece inner tube refractory material.

FIG. 3 is a development view showing another example of a vertical refractory inner cylinder.

FIG. 4 is a development view showing another example of the inner cylinder refractory having a vertical shape.

[Explanation of symbols]

 1 Metal Cylindrical Body 2 Outward Flange 3 Stud 4 Engagement Hardware 5 Integral Inner Cylinder Refractory 5'Protrusion or Ridge 6 Irregular Refractory 7 Inner Cylinder Refractory 8 Engagement Part 15 Integral Inner Cylinder Refractory 25 Integrated inner tube refractory

Claims (3)

[Scope of utility model registration request] 1. A dip tube for a vacuum degassing apparatus, comprising a metal cylindrical body (1) having an outwardly facing flange at the top and an inner cylinder refractory arranged on the inner peripheral surface of the cylindrical body (1). At
The inner cylinder refractory locking portion (4) provided on the inner peripheral surface of the cylindrical body (1) is located within a range from the substantially central portion to the top in the height direction of the dip tube, and the inner cylinder refractory (5 ) Is divided into a plurality of pieces in the circumferential direction and is made of a single piece in the height direction, and an engaging portion (8) for engaging with the engaging portion (4) is provided on the outer peripheral surface of the inner tubular refractory material (5). An immersion tube for a vacuum degassing device, which is characterized by: 2. The dip tube for a vacuum degassing apparatus according to claim 1, wherein the inner cylinder refractory of the height direction integral body has a shape close to the vertical and is alternately combined. 3. The immersion pipe for a vacuum degassing apparatus according to claim 1, wherein a locking ridge is provided on the outer periphery of the top of the inner cylinder refractory of the one piece in the height direction.