Bottom blowing gun

Abstract

The utility model relates to a bottom blowing gun, which belongs to the technical field of bottom blowing guns and comprises a gun body, an outer tube and an inner tube are arranged at the front end of the gun body, the gun body is communicated with the inner tube, and a flange is fixedly connected outside the front end of the outer tube. Impurities such as combustible materials are prevented from entering the gun body to cause the risks of spray pipe blockage and even combustion and explosion, the safety and reliability of the gun are improved, and the service life of the gun is prolonged; the mounting mode is changed from welding outside a sleeve to flange assembly, so that the working efficiency of disassembling and assembling the gun body is improved; meanwhile, the air inlet connector and the gun body are connected in a welding mode instead of a threaded mode, and the raw material belt at the threaded position is prevented from entering the gun head to cause blockage.

Description

Technical Field

[0001] The utility model relates to a bottom blowing lance, belonging to the technical field of bottom blowing lances. Background Art

[0002] The bottom blowing lance is a key device for converter steelmaking. It is mainly used for bottom blowing the molten steel in the converter to improve metallurgical properties, enhance the quality of molten steel, and reduce the comprehensive cost. The design and performance of the bottom blowing lance directly affect the efficiency and quality in the smelting process. The current bottom blowing lance generally includes an outer tube, an inner tube and a sleeve. The sleeve is sleeved outside the outer tube, and the installation method is generally the way of welding outside the sleeve. The operation is difficult during welding and disassembly, and the work efficiency is low. In addition, the current bottom blowing lance is not provided with a filtering device, and the introduced inert gas often contains impurities such as combustibles, resulting in risks such as blockage, combustion and explosion. Moreover, the air inlet joint of the bottom blowing lance and the lance body are generally connected by threads, and raw tape is generally used to ensure the sealing performance, but the raw tape is easy to enter the lance head and cause blockage. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a bottom blowing lance aiming at the above deficiencies. A filter screen is arranged in the air inlet pipe to prevent impurities such as combustibles from entering the lance body and causing risks such as nozzle blockage, combustion and explosion, so as to improve the safety and reliability of the lance and extend the service life of the lance. The installation method is changed from welding outside the sleeve to flange assembly, which improves the work efficiency of disassembling and assembling the lance body. At the same time, the connection between the air inlet joint and the lance body is changed from threaded connection to welding, preventing the raw tape at the thread from entering the lance head and causing blockage.

[0004] In order to solve the above technical problems, the technical scheme adopted by the utility model is as follows: A bottom blowing lance includes a lance body. An outer tube and an inner tube are arranged at the front end of the lance body. The lance body is communicated with the inner tube, and a flange is fixedly connected to the outside of the front end of the outer tube.

[0005] As a further improvement of the above technical scheme:

[0006] A first air inlet joint is fixedly connected to the rear end of the outer tube, and a filter screen is arranged in the first air inlet joint.

[0007] The filter screen is conical, and the open end of the filter screen faces the inner tube.

[0008] The outer tube is sleeved outside the inner tube, and there is a gap between the outer tube and the inner tube.

[0009] The first air inlet joint is communicated with the gap.

[0010] A second air inlet joint is connected to the rear end of the lance body, and the second air inlet joint is welded to the lance body.

[0011] The utility model adopts the above technical solutions and has the following advantages: The inert gas enters from the first air inlet joint and enters the outer tube after being filtered by the conical filter screen. The filtration by the filter screen can prevent impurities such as combustibles from entering the gun body and causing blockage, combustion, explosion and other risks, improve the safety and reliability of the gun, and extend the service life of the gun. In addition, a flange is fixedly connected to the outside of the front end of the outer tube, and the installation method is changed from welding outside the sleeve to flange assembly, which improves the working efficiency of disassembling and assembling the gun body. At the same time, the connection between the air inlet joint and the gun body is changed from threaded connection to welding, preventing the raw material tape at the thread from entering the gun head and causing blockage.

[0012] The following further describes the utility model with reference to the drawings and embodiments. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the bottom blowing gun in the embodiment of the utility model.

[0014] In the figure,

[0015] 1-gun body, 2-outer tube, 3-inner tube, 4-gap, 5-flange, 6-first air inlet joint, 7-filter screen, 8-second air inlet joint. Specific Embodiments

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0017] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the utility model. Embodiment

[0018] As Figure 1As shown in the figure, a bottom blowing lance includes a lance body 1. At the front end of the lance body 1, there are an outer tube 2 and an inner tube 3. The outer tube 2 is sleeved outside the inner tube 3, and there is a gap 4 between the outer tube 2 and the inner tube 3. The lance body 1 is communicated with the inner tube 3. At the outside of the front end of the outer tube 2, a flange 5 is fixedly connected. At the rear end of the outer tube 2, a first air inlet joint 6 is fixedly connected. The first air inlet joint 6 is communicated with the gap 4. A filter screen 7 is arranged in the first air inlet joint 6. The filter screen 7 is conical, and the open end of the filter screen 7 faces the inner tube 3. At the rear end of the lance body 1, a second air inlet joint 8 is connected. The second air inlet joint 8 is welded to the lance body 1.

[0019] Inert gas enters from the first air inlet joint 6, and after being filtered by the conical filter screen 7, it enters the outer tube 2. The filtration by the filter screen 7 can prevent impurities such as combustibles from entering the lance body and causing blockage, or even risks such as combustion and explosion, improving the safety, reliability and service life of the lance. In addition, a flange 5 is fixedly connected to the outside of the front end of the outer tube 2, and the installation method is changed from welding outside the sleeve to flange 5 assembly, improving the working efficiency of disassembling and assembling the lance body. At the same time, the connection between the air inlet joint and the lance body 1 is changed from threaded connection to welding, preventing the raw tape at the thread from entering the lance head and causing blockage.

[0020] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bottom blowing gun, characterized in that: The gun body (1) comprises an outer tube (2) and an inner tube (3) at the front end of the gun body (1), the gun body (1) being connected to the inner tube (3), a flange (5) being fixedly connected to the outside of the front end of the outer tube (2); a first air inlet connector (6) being fixedly connected to the rear end of the outer tube (2), a filter screen (7) being provided inside the first air inlet connector (6).

2. A bottom blowing gun according to claim 1, characterized in that: The filter screen (7) is conical, and the opening end of the filter screen (7) faces the inner tube (3).

3. A bottom blowing gun according to claim 2, characterized in that: The outer tube (2) is sleeved on the outside of the inner tube (3), and a gap (4) is provided between the outer tube (2) and the inner tube (3).

4. A bottom blowing gun according to claim 3, characterized in that: The first air inlet connector (6) is in communication with the gap (4).

5. A bottom blowing gun according to claim 4, characterized in that: The rear end of the gun body (1) is connected to a second air inlet connector (8), and the second air inlet connector (8) is welded to the gun body (1).

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