JPH0646595Y2 - Gas bubbling nozzle - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, for example, in continuous casting for steelmaking, the present invention prevents clogging of a pouring nozzle due to solidification of molten steel, non-metallic inclusions in a ladle, and a tundish. The present invention relates to a gas bubbling nozzle attached to a molten metal container for promoting floating.

Hereinafter, in the present invention, the gas pool is one of the constituents of a gas bubbling portion, and the gas bubbling portion is a gas pool, a porous refractory material or a gas bubbling nozzle refractory material around the gas pool. Refers to the connected part.

[Conventional technology]

Conventionally, as such a gas bubbling nozzle, an upper nozzle provided with a gas bubbling mechanism is disclosed in Japanese Utility Model Laid-Open No. 61-41449.
There is a structure described in Japanese Patent Publication No. 60-160965.

The upper nozzle for gas bubbling is shown in FIG. 5 and FIG.
As shown in FIG. 6 as seen from the line VI-VI, the nozzle body C made of a refractory material is disposed in the metal case A with the sealant B interposed between the upper gas pool D and the lower gas pool E. The metal case A
Dedicated gas blowing pipes F and G connected to each gas pool are provided on the outside of the, and the flow rate of the gas supplied to the respective gas pools D and E is controlled.

[Problems to be solved by the device]

However, F, G provided outside the metal case A
Multiple gas injection pipes, such as, due to the position of the upper nozzle attached to the casting device, causes various restrictions on the arrangement, the spacing between each must be extremely narrow, therefore, The upper gas pool D has a structure connected by a guide groove H.

Therefore, dedicated pipes F and G to the respective gas pools D and E
There is a possibility that gas may be mixed with each other and reliable control of gas supply may not be possible.

As a countermeasure, a method of filling a sealant B between the nozzle body C and the metal case A to block the inflow of gas between the gas blowing pipes is adopted.

However, it is impossible to prevent the outflow of gas and prevent the inflow of gas between the gas blowing pipes when the metal case expands at the time of receiving heat when pouring out the molten metal.

The problem to be solved in the present invention is to provide a gas bubbling portion such as a gas pool in several places of the related art, and to provide a dedicated gas blowing pipe connected to each gas bubbling portion (gas pool) on the outside of the metal case. The gas bubbling upper nozzle that is designed to control the gas flow rate, prevents gas from flowing into other gas bubbling parts (gas pools) from other gas blowing pipes, and simplifies the periphery of the gas bubbling nozzle. The purpose is to find effective means for rationalizing the design of the attachment area.

[Means for Solving the Problems]

The present invention comprises a nozzle main body made of an inorganic material and a metal case arranged outside the nozzle main body. Gas pools are provided at the upper and lower parts of the nozzle main body, and independent gas pumps are provided for feeding gas into each gas pool. In the nozzle of the molten metal container in which the gas blowing pipe is attached to the outside of the metal case, a gas guide pipe connecting the upper gas pool and the gas blowing pipe is provided along the metal case.

As a result, the exclusive gas injection pipes are completely cut off from each other, and the flow rate control to the individual gas pools is made more reliable.

The gas guide pipe connecting the gas pool and the gas blowing pipe at at least one location can be provided with a sealant between the metal case and the refractory body, and the sealant can be provided along the axial direction of the nozzle. . It may also be provided outside the metal case of the nozzle. In this case, the structure is simple and the assembly is easy.

Here, the gas guide pipe needs to be provided along the metal case, and it is better to be adjacent to the metal case, but it may be slightly embedded in the nozzle body. Further, the gas guide pipe and the gas blowing pipe may be integrated with each other apart from the metal case, or may be connected inside or outside the nozzle body via a joint. In any case, in the present invention, a plurality of gas injection pipes leading to the nozzle body are concentrated on one outer surface of the nozzle body, and from there, a gas guide pipe is used to reach the location of gas bubbling along the metal case along the nozzle body. The inner side and / or the outer side may be fitted together, and in some cases, the inner side and the outer side of the metal case may be alternated.

The guide pipe may be a ceramic pipe of alumina, zirconia, silica, zircon, SiC, Si ₃ N ₄ or the like, or a steel pipe, other non-ferrous metal pipe, or a pipe made of a heat-resistant organic material.

When molding the gas bubbling nozzle of the present invention, there are a method of pouring an indeterminate porous refractory material into a mold, a uniaxial molding by a press, or an integral molding by a lapper press, etc. In order to clearly distinguish the above, if a gas-impermeable dense material or a material having a different degree of porosity is combined in the middle of each material, the effect of controlling gas bubbling is further enhanced.

Further, in molding, when filling materials, different materials may be separately filled and molded (pressed and cast), or a composite refractory in which different materials are joined in advance may be used.

〔Example〕

FIG. 1 shows an embodiment of the present invention in cross section, and FIG. 2 shows a cross sectional structure taken along the line II--II in FIG.

In these figures, the same parts as those of the conventional example shown in FIGS. 5 and 6 are indicated by the same symbols, and 1 indicates a gas guide pipe according to the present invention.

That is, it has a nozzle body (C) made of an inorganic material such as a nozzle refractory of a molten metal container, and a metal case (A) arranged outside the nozzle body (C). ) Upper and lower gas pools (D), (E) are provided, and the respective gas pools (D),
In the nozzle of the molten metal container in which independent gas blowing pipes (F) and (G) for feeding gas to (E) are attached to the outside of the metal case (A), the upper gas pool (D) and the gas blowing pipe (F) ) Is provided along the metal case (A).

The gas guide pipe 1 is connected to the gas injection pipe F attached to the metal case A in the gas pool D, passes through between the sealant B filled between the metal case A and the refractory, and is connected to the upper part. It opens into the gas pool D.

FIG. 3 is a diagram showing the details of the connection between the gas guide pipe 1 and the gas blowing pipe F. By connecting the gas guide pipe 1 and the gas injecting pipe F through the connecting member 2, the connection is ensured and the gas leaks from the connecting portion. Absent. In this figure, the upper gas pool D space and the lower gas pool E space that surround the entire circumference of the nozzle body are cut at two places, and the grooves 4a, 4b with a short width from the upper gas pool space to the lower end 3 of the nozzle body are formed. Cutting, and the upper gas pool D space and the lower gas pool E of the groove
The portion 4a between the spaces is attached by filling the guide pipe 1 with the sealant B, and the portion 4b of the lower gas pool E space from the rest of the groove to the lower gas bubbling gas injecting pipe G for the lower gas bubbling. The connecting groove space 5 connects the lower gas pool E space.

In one example of the manufacturing method adopted in this example, the guide pipe is formed by cutting grooves for the gas pool, the guide pipe, etc. on the refractory surface regardless of whether or not the refractory is baked after the nozzle body is molded. It is set between the inside of the metal case and the groove of the refractory (nozzle body) and filled with sealable mortar and other sealant at the same place. In this case, if the surface of the guide pipe and / or the groove is provided with irregularities or dents before the sealing agent is adhered, the adhesion is better and the sealing property is improved.

In the conventional upper gas pool D, a guide groove is provided in order to improve the connection with the gas blowing pipe F, and the upper upper gas pool D is formed by a space that greatly expands downward. In the case of the present invention, however, gas is not supplied to the gas pool. , The gas itself does not enter the other gas pools because it is performed by a pipe with a good sealing property.

As described above, the guide pipe according to the present invention is provided to prevent gas mixture between the plurality of independently provided pipes. Therefore, as shown in the figure, a plurality of gas pools are vertically arranged. In that case, if the gas to the upper gas pool is connected by the guide pipe 1, the effect can be sufficiently exerted.

Of course, the accuracy of control can be improved by providing the guide pipes in all of the plurality of gas pools.

The defect rate of the conventional type without guide pipes shown in FIGS. 5 and 6 was as high as 25% due to the sealing agent closing the guide groove, etc. The defective rate in the case of the nozzle of the present invention having the structure shown in FIG. 2 is about 1% or less, which is a large decrease.

FIG. 4 shows an example in which a gas-impermeable dense refractory material J is combined with the main body refractory material. FIG. 4 is a diagram showing another embodiment of the present invention. Referring to the figure, the guide pipe 11 according to the present invention is provided on the outer surface of the metal case A along the axial direction thereof. This allows the gas bubbling to be controlled more accurately and centrally.

As in the case of the first embodiment, the internal structure of the nozzle body C can be simplified. As a means for attaching the guide pipe to the outside of the metal case, there is a method of attaching by welding or a clamp, but in any case, it is better to be adjacent to the metal case.

The nozzle according to the present invention has a plurality of gas bubbling parts for the nozzle body, and a plurality of gas blowing pipes corresponding to the gas bubbling parts.
It is preferable to independently provide a flow rate adjusting jig such as a pump, a valve, a cylinder, an accumulator, and a supply device so that the type and the like can be freely changed. Also,
In the above embodiment, only the example of the upper nozzle has been described, but the nozzle of the present invention can be used as a pouring nozzle using a metal case such as a dipping nozzle, a sliding nozzle, a nozzle tuyere brick and the like.

[Effect of device]

 The present invention has the following effects.

(1) Since it is possible to completely shut off the blow pipes from each other,
There is no gas leak.

(2) Since the amount of gas supplied to each gas pool can be precisely controlled, the gas bubbling of the molten metal in the container can be finely performed.

(3) The gas supply can be secured even if the metal case and the seal material are damaged during use.

(4) The structure is simple and the assembly is easy.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention, and FIG. 4 shows a second embodiment in which a gas-impermeable dense refractory material is combined with the body refractory material. Show. 5 to 6 show a conventional example. 1,11: Gas guide pipe 2: Connecting member, 3: Lower end of nozzle body 4a, 4b: Groove, 5: Connecting groove space A: Metal case, B: Sealant C: Nozzle body, D: Upper gas pool E: Lower part Gas pool F, G: Gas injection pipe H: Guide groove, J: Dense refractory material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B22D 41/58 7511-4E (56) References Japanese Patent Application No. 63-80068 (Japanese Utility Model Sho 61- No. 174620) and the specification and drawings attached to the application of Microfilm (JP, U) Japanese Patent Application No. 53-128317 (Japanese Utility Model Application No. 52-33799). Film of the contents of the film (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A nozzle body (C) made of an inorganic material, and a metal case (A) arranged outside the nozzle body (C).
And gas pools (D) and (E) are provided on the upper and lower parts of the nozzle body (C), and independent gas blowing pipes (F) for feeding gas into the respective gas pools (D) and (E). ), (G) are attached to the outside of the metal case (A) in the nozzle of the molten metal container, the upper gas pool (D) and the gas blowing pipe (F)
A gas bubbling nozzle, characterized in that a gas guide pipe (1) for connecting to and is provided along a metal case (A).