CN218710640U

CN218710640U - Connection protection mechanism for furnace legs and immersion pipes of single-pipe vacuum furnace

Info

Publication number: CN218710640U
Application number: CN202222525642.6U
Authority: CN
Inventors: 魏建华; 赵占山; 付友鹏; 朱韶哲; 张民庆
Original assignee: Aomg China Co ltd
Current assignee: Aomg China Co ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2023-03-24
Anticipated expiration: 2032-09-23

Abstract

The utility model discloses a connection protection mechanism of single tube vacuum furnace leg and dip pipe belongs to the external concise field of iron and steel stove. The device comprises furnace legs, a dip pipe, a furnace leg cooling chamber, a dip pipe steel strip, a lifting gas pipe and a pipeline protection device thereof; the furnace legs are provided with a furnace leg working layer, a back seam material, a furnace leg shell and a furnace leg flange; the dip pipe is provided with a dip pipe flange, a working layer brick, an internal casting material, an anchoring piece, an external casting material and a dip pipe shell; the dip pipe flange and the furnace leg flange are welded and fixed through a dip pipe steel belt; the lifting gas pipe extends into the dipping pipe through the internal castable and the working layer bricks; a pipeline protection device for protecting the lifting gas pipe is fixed on the shell of the dip pipe; and the cavity is arranged between the working layer brick and the dipping pipe flange, so that gas passing through a gap between the furnace leg flange and the dipping pipe flange is prevented from corroding the working layer, the furnace leg of the vacuum furnace is simply connected with the dipping pipe, the sealing performance is improved, and the lifting gas pipeline is not easy to burn off.

Description

Connection protection mechanism for furnace legs and immersion pipes of single-pipe vacuum furnace

Technical Field

The utility model relates to a connection protection mechanism of a furnace leg and a dip pipe of a single-tube vacuum furnace, belonging to the field of external refining of steel furnaces.

Background

The molten steel vacuum treatment technology adopts a vacuum furnace to carry out external refining on the molten steel so as to remove hydrogen and impurities in the molten steel and produce high-purity steel. The vacuum furnace is composed of a vacuum chamber and a dipping tube. However, the dip pipe is the position with the worst working condition and the fastest corrosion loss in the vacuum furnace and is also a key factor for limiting the service life of the vacuum furnace. The prior art bulletin number: CN 106011389B mentions that "the damage form of the vacuum furnace dip pipe mainly includes: scouring of high-temperature molten steel, slag erosion, thermal exfoliation and structural exfoliation caused by temperature fluctuation, refractory material sinking and breaking and the like; the notice number is: CN 214458150U mentions that "because the dip pipe is connected with the bottom of the vacuum tank through a flange, the sealing performance of the dip pipe flange and the accuracy of the butt joint position are very important to the service life of the dip pipe, the circulating pipe and the lower tank as a whole. In the prior art, a sealing surface of a flange for connecting the dip pipe is of a planar structure, is influenced by the use environment, has poor flange sealing effect, is inaccurate in positioning during butt joint, and also influences the sealing effect of the flange of the dip pipe to cause leakage, the vacuum degree in the refining process cannot meet the production requirement, so that the dip pipe is short in service life, frequent in offline, seriously influences the production rhythm, and reduces the production rate. "; the large single-tube vacuum furnace is mainly designed for realizing deep desulfurization, deep decarburization and other vacuum treatment functions in a vacuum chamber; the notice number is: CN 216274239U mentions that "the dip pipe for the single-pipe vacuum furnace is easily deformed due to high temperature in the using process, and meanwhile, the welding seam is easily failed, especially the deformation of the flange and the failure of the welding seam, which more directly affects the using safety of the furnace leg and the groove of the vacuum furnace; the 'and' sealing gasket and bolt design can better ensure that the original flange is not damaged under the condition of ensuring sealing. ". In conclusion, the lifting gas pipeline may be blown in the use process, and the furnace leg flange and the dip pipe flange are connected by bolts, so that the connection is complex, the sealing is not tight, and the like, which seriously affects the actual service life of the dip pipe.

SUMMERY OF THE UTILITY MODEL

For the above-mentioned problem that solves prior art and exists, this application provides a connection protection mechanism of single tube vacuum furnace stove leg and dip pipe, has realized that vacuum furnace stove leg is simple with the dip pipe connection, improves the leakproofness and guarantees to promote the difficult blowout of gas line.

In order to achieve the purpose, the technical scheme of the application is as follows: a connection protection mechanism for a furnace leg and a dip pipe of a single-tube vacuum furnace comprises the furnace leg, the dip pipe, a furnace leg cooling chamber, a dip pipe steel belt, a lifting gas pipe and a pipeline protection device.

The furnace legs are provided with a furnace leg working layer, a back seam material, a furnace leg shell and a furnace leg flange; the furnace leg working layer, the back seam material and the furnace leg shell are all cylindrical and are sequentially arranged from inside to outside, and a furnace leg flange is arranged at the top of the outer side of the back seam material.

The dip pipe is provided with a dip pipe flange, a working layer brick, an internal casting material, an anchoring part, an external casting material and a dip pipe shell; the working layer bricks, the inner casting material, the dip pipe shell, the anchoring piece and the outer casting material are sequentially arranged from inside to outside.

Further, the dip pipe flange is positioned at the top of the outer side of the inner castable; the lifting gas pipe extends into the dipping pipe through the internal castable and the working layer bricks; the furnace leg flange is positioned on the top of the outer side of the back seam material on the furnace leg.

Furthermore, the furnace leg cooling chamber is positioned at the bottom of the furnace leg flange, and comprises a furnace leg flange air inlet hole and a furnace leg flange air outlet hole which are respectively arranged at two sides of the furnace leg flange, and a cavity which is formed by the top of the working layer brick being higher than the top of the dipping pipe flange.

Further, the dip pipe flange and the furnace leg flange are welded and fixed through a dip pipe steel belt; the quality of the steel strip of the dip pipe is preferably low-alloy high-strength carbon structural steel which is not less than Q245.

Further, the dip pipe cooling chamber is positioned at the bottom of the dip pipe flange.

Furthermore, the pipeline protection device is fixed on the dip pipe shell, the inner diameter of the pipeline protection device is larger than that of the lifting gas pipe, and the pipeline protection device is a steel pipe filled with casting materials inside and plays a role in protecting the lifting gas pipe.

The utility model discloses owing to adopt above technical scheme, can gain following technological effect:

(1) The dip pipe flange and the furnace leg flange are welded and fixed through the dip pipe steel belt, compared with the prior art that the dip pipe is connected through bolts and fixed through sealant, the butt joint difficulty of the dip pipe of the large single-pipe vacuum chamber is greatly reduced, and the dip pipe and the furnace leg can be completely sealed;

(2) Cooling media are introduced into the furnace leg cooling chamber and the dip pipe cooling chamber for cooling treatment, so that the connection quality of the furnace leg flange and the dip pipe flange caused by high temperature is avoided, and the service life of the flange can be greatly prolonged; and a cavity is arranged between the working layer brick and the dipping pipe flange, so that the working layer is prevented from being damaged and corroded by gas passing through a gap between the furnace leg flange and the dipping pipe flange.

Drawings

FIG. 1 is a schematic structural view of a connection protection mechanism of a leg and a dip pipe of a single-tube vacuum furnace;

FIG. 2 is a top view of a connection protection mechanism for a leg and a dip tube of a single-tube vacuum furnace;

FIG. 3 is an enlarged view of a portion of I.

The sequence numbers in the figures illustrate: 1. a furnace leg working layer; 2. back sewing materials; 3. a furnace leg housing; 4. a furnace leg flange; 5. a furnace leg cooling chamber; 6. a dip tube steel strip; 7. a dip pipe flange; 8. a dip tube cooling chamber; 9. a furnace leg flange air inlet; 10. a furnace leg flange air outlet; 11. working layer bricks; 111. a cavity; 12. an internal castable; 13. an anchoring member; 14. an external castable; 15. a pipeline protection device; 16. a lift gas tube; 17. the tube shell is dipped.

Detailed Description

The invention will be described in further detail with reference to the following figures and specific embodiments: the present application is further described by taking this as an example.

Example 1

As shown in fig. 1 to 3, the present embodiment provides a connection protection mechanism for a furnace leg and a dip pipe of a single-tube vacuum furnace, which comprises a furnace leg, a dip pipe, a furnace leg cooling chamber, a dip pipe steel strip 6, a lifting gas pipe 16 and a pipeline protection device 15; the furnace legs are provided with a furnace leg working layer 1, a back seam material 2, a furnace leg shell 3 and a furnace leg flange 4; the furnace leg working layer 1, the back seam material 2 and the furnace leg shell 3 are all cylindrical and are sequentially arranged from inside to outside, a furnace leg flange 4 is arranged at the top of the outer side of the back seam material 2, and a furnace leg flange air inlet 9 and a furnace leg flange air outlet 10 are respectively arranged on the furnace leg flange 4; the dip pipe is provided with a dip pipe flange 7, a working layer brick 11, an internal casting material 12, an anchoring piece 13, an external casting material 14, a lifting gas pipe 16 and a dip pipe shell 17; the working layer bricks 11, the inner casting material 12, the dip pipe shell 17, the anchoring pieces 13 and the outer casting material 14 are sequentially arranged from inside to outside, and the dip pipe flange 7 is arranged at the top of the outer side of the inner casting material 12; a plurality of lifting gas pipes 16 extend into the dip pipe through the internal castable 12 and the working layer bricks 11; the dipping pipe flange 7 and the furnace leg flange 4 are fixed in a butt joint mode through a dipping pipe steel belt 6. The bottom of the furnace leg flange 4 is provided with a furnace leg cooling chamber 5. The bottom of the dip pipe flange 7 is provided with a dip pipe cooling chamber 8. The top of the working layer brick 11 is higher than the top of the dipping pipe flange 7, and a cavity 111 is arranged between the working layer brick 11 and the dipping pipe flange 7. A pipeline protection device 15 for protecting the lifting gas pipe 16 is fixed on the dip pipe shell 17.

The number of the furnace leg flange air inlet holes 9 and the number of the furnace leg flange air outlet holes 10 can be set according to the actual situation. In the present example, the number of the furnace leg flange air inlet holes 9 and the number of the furnace leg flange air outlet holes 10 are 2.

The dipping pipe flange and the furnace leg flange are welded and fixed through a dipping pipe steel belt.

In practical industrial application, the dip pipe is easy to deform due to the action of high temperature in the using process, and meanwhile, a welding line is easy to lose efficacy, particularly the deformation of a flange and the failure of the welding line, so that the using safety of a furnace leg and the dip pipe is directly influenced. Therefore, the furnace leg of the utility model adopts two-way cooling chamber design, namely, the furnace leg flange air inlet holes 9 and the two furnace leg flange air outlet holes 10 are arranged at the two sides of the furnace leg flange 4, so that the stroke of the cooling medium in the flange is shortened by 1/2, and the cooling effect is excellent; the dipping pipe flange 7 is horizontally designed, the dipping pipe steel strip 6 is connected with the dipping pipe flange 7 in a welding mode, when the dipping pipe flange 7 is in butt joint with the furnace leg flange 4, the dipping pipe steel strip 6 and the dipping pipe are directly sleeved in the furnace leg flange 4, and then the dipping pipe steel strip 6 and the furnace leg flange 4 are fixedly welded.

The cooling medium is preferably cold water or cold air.

A duct protection device 15 is added outside the lift gas duct 16 to prevent the lift gas duct from being damaged. The top of the working layer brick 11 is higher than the top of the dip pipe flange 7, a cavity 111 is arranged between the working layer brick 11 and the dip pipe flange 7, the cavity 111 needs to be filled with casting materials after being installed with a furnace leg matched with the upper part, a gas channel is changed, and the engineering layer brick 11 is prevented from being damaged and corroded by the gas through channel.

The above, only for the utility model discloses create the concrete implementation way of preferred, nevertheless the utility model discloses the protection scope of creation is not limited to this, and any person skilled in this technical field is in the utility model discloses create the technical scope of disclosure, according to the utility model discloses the technical scheme of creation and utility model design equivalence replacement or change all should be covered in the protection scope of creation of the utility model.

Claims

1. A connection protection mechanism for a furnace leg and a dip pipe of a single-tube vacuum furnace is characterized by comprising a furnace leg, a dip pipe, a furnace leg cooling chamber (5), a dip pipe steel belt (6), a lifting gas pipe (16) and a pipeline protection device (15); the furnace legs are provided with a furnace leg working layer (1), a back seam material (2), a furnace leg shell (3) and a furnace leg flange (4); the furnace leg working layer (1), the back seam material (2) and the furnace leg shell (3) are all cylindrical and are sequentially arranged from inside to outside, and a furnace leg flange (4) is arranged at the top of the outer side of the back seam material (2); the dip pipe is provided with a dip pipe flange (7), a working layer brick (11), an internal casting material (12), an anchoring piece (13), an external casting material (14) and a dip pipe shell (17); the working layer bricks (11), the internal castable (12), the dip pipe shell (17), the anchoring pieces (13) and the external castable (14) are arranged in sequence from inside to outside; the lifting gas pipe (16) extends into the dip pipe through the internal casting material (12) and the working layer bricks (11); a pipeline protection device (15) for protecting the lifting gas pipe (16) is fixed on the dipping pipe shell (17); the dip pipe flange (7) is positioned at the top of the outer side of the inner castable (12), and the furnace leg flange (4) is positioned at the top of the outer side of the back seam material (2) on the furnace leg; the furnace leg cooling chamber (5) is positioned at the bottom of the furnace leg flange (4), the furnace leg cooling chamber (5) comprises a furnace leg flange air inlet hole (9) and a furnace leg flange air outlet hole (10) which are respectively arranged at two sides of the furnace leg flange (4), and a cavity (111) formed by the top of the working layer brick (11) being higher than the top of the dip pipe flange (7); the dipping pipe flange (7) and the furnace leg flange (4) are welded and fixed through a dipping pipe steel belt (6).

2. The connection protection mechanism for the oven leg and the dip pipe of the single-tube vacuum oven according to claim 1, characterized in that the number of the air inlet holes (9) of the oven leg flange and the air outlet holes (10) of the oven leg flange is 2.

3. The connection protection mechanism for the furnace leg and the dip pipe of the single-tube vacuum furnace according to claim 1, characterized in that the dip pipe steel strip (6) is made of low-alloy high-strength carbon structural steel with the material quality not lower than Q245.

4. The connection protection mechanism for the furnace leg and the dip pipe of the single-tube vacuum furnace according to claim 1, characterized in that the bottom of the dip pipe flange (7) is a dip pipe cooling chamber (8).

5. The connection protection mechanism for the leg and the dip pipe of the single tube vacuum furnace according to claim 1, wherein the inner diameter of the pipe line protection device (15) is larger than that of the lifting gas pipe (16), and the pipe line protection device (15) is a steel pipe with casting material injected inside.