Direct-current electric arc furnace
By designing a hollow flow channel inside the beam ring and setting inlet and outlet water ports, cooling water circulation is achieved, which solves the problem of thermal expansion and contraction of the beam ring caused by high temperature, extends service life, simplifies structure, and improves equipment reliability and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI GLOBAL UNION TECHNOLOGY CO LTD
- Filing Date
- 2025-06-25
- Publication Date
- 2026-05-19
AI Technical Summary
The beam ring of a DC electric arc furnace is prone to cracking due to thermal expansion and contraction in high-temperature environments. Existing technological improvements have resulted in a complex furnace cover structure, and the risk of cracking still exists.
A hollow flow channel is designed inside the beam ring, with inlet and outlet water inlets, which are connected to the cooling water system to achieve cooling water circulation and reduce the temperature variation of the beam ring.
This effectively avoids the thermal expansion and contraction of the beam ring caused by temperature changes, improves its service life, simplifies the furnace cover edge structure, and enhances the reliability and ease of operation of the equipment.
Smart Images
Figure CN224262212U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of metal smelting, and in particular relates to a DC electric arc furnace. Background Technology
[0002] A direct current (DC) electric arc furnace is an electric arc furnace that uses direct current (DC) as its energy source. It generates heat through an electric arc between electrodes and the furnace charge (or molten pool) to achieve the purpose of melting. This type of furnace is suitable for melting steel, alloys, and non-ferrous metals. The furnace cover beam is a crucial component of a DC electric arc furnace, its main function being to support the furnace lid and assist in heat dissipation. However, during the smelting process, due to the high temperatures, the furnace cover beam of a DC electric arc furnace is prone to thermal expansion and contraction, leading to cracking.
[0003] To address the problem of beam ring cracking, existing technologies have employed various measures. For example, spring supports are added to the edge of the beam ring, or universal joints are used to connect the furnace cover and the furnace body. However, these structural designs result in a complex structure at the edge of the furnace cover, which is also affected by high temperatures, making it prone to cracking. Utility Model Content
[0004] In view of this, the present invention provides a DC electric arc furnace, which aims to solve the problem of easy cracking of the beam ring in the prior art while maintaining the simplicity of the furnace cover edge structure.
[0005] The technical solution of this utility model is implemented as follows:
[0006] This utility model provides a DC electric arc furnace, including a furnace body with an open top and an internal cavity for accommodating materials to be smelted; a furnace cover that covers the top of the furnace body; the furnace cover has a through hole for a motor rod to pass through; a beam ring disposed at the edge of the furnace cover and supporting the furnace cover; wherein the beam ring is hollow inside and has a water flow channel, the beam ring is provided with a water inlet and a water outlet, the water inlet and the water outlet being respectively connected to the flow channel.
[0007] In one embodiment, the furnace cover includes an inner spherical surface on the inner side and an outer spherical surface on the outer side, and a first inclined surface connecting the inner spherical surface and the outer spherical surface; the first inclined surface faces the outer side of the receiving cavity, and the first inclined surface and the top surface of the furnace body form an acute angle; wherein the beam ring abuts between the first inclined surface of the furnace cover and the top surface of the furnace body.
[0008] In one embodiment, the beam ring has a second inclined surface that conforms to the first inclined surface of the furnace cover and a bottom surface that conforms to the top surface of the furnace body, as well as a connecting surface connecting the second inclined surface and the bottom surface; wherein the water inlet and the water outlet are distributed on the connecting surface.
[0009] In one embodiment, the water inlet and the water outlet are arranged opposite each other in the diametrical direction of the furnace cover.
[0010] In one embodiment, the beam ring protrudes upward relative to the edge of the furnace cover to form a protrusion, and the water inlet and the water outlet are disposed on the protrusion.
[0011] In one embodiment, the inlet and the outlet are each provided with a quick connector.
[0012] In one embodiment, the system further includes: a cold water connecting hose connected to the inlet to provide cold water into the flow channel; and a hot water connecting hose connected to the outlet to draw hot water out of the flow channel.
[0013] In one embodiment, a water tank is also included, which is connected to the hot water connection hose to store the hot water flowing from the outlet.
[0014] In one embodiment, a water inlet is provided at the bottom of the water tank, which is used to draw water out of the water tank.
[0015] In one embodiment, an insulation layer is provided on the outside of the water tank.
[0016] This utility model provides a DC electric arc furnace, which includes a furnace body, a furnace cover, and a beam ring. The furnace body has an open top and an internal cavity for accommodating the material to be smelted. The furnace cover fits over the top of the furnace body and has a through hole for a motor rod to pass through. The beam ring is located at the edge of the furnace cover and supports it. The beam ring is hollow inside and has a water flow channel. The beam ring has an inlet and an outlet, which are respectively connected to the flow channel. This utility model solves the problem of thermal expansion and contraction caused by high temperatures in traditional beam rings by optimizing the beam ring structure and using a hollow interior with a flow channel. By setting an inlet and an outlet on the beam ring and connecting it to an external cooling water system, the circulation of cooling water is achieved, thereby reducing the temperature fluctuation of the beam ring. Furthermore, the beam ring itself is designed to support the furnace cover; that is, the beam ring not only supports the furnace cover but also provides excellent heat dissipation and effectively prevents thermal expansion and contraction caused by temperature changes, thus significantly improving the service life of the beam ring. In addition, due to the internal flow channel design of the beam ring, its structure is simple, simplifying the structure of the furnace cover edge. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0018] Figure 1 An overall sectional view of an embodiment of the DC electric arc furnace provided by this utility model;
[0019] Figure 2 for Figure 1 A schematic diagram of the furnace lid structure;
[0020] Figure 3 for Figure 1 Enlarged view of point A in the middle.
[0021] 1. Furnace body; 11. Receiving cavity; 12. Top surface; 2. Furnace cover; 21. Through hole; 22. Inner spherical surface; 23. Outer spherical surface; 24. First inclined surface; 3. Beam ring; 31. Flow channel; 32. Water inlet; 33. Water outlet; 34. Second inclined surface; 35. Bottom surface; 36. Protrusion; 4. Electrode rod; 5. Quick connector; 6. Cold water connection hose; 7. Hot water connection hose; 8. Water tank; 81. Water inlet. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0025] A direct current (DC) electric arc furnace is an electric arc furnace that uses direct current (DC) as its energy source. It generates heat through an electric arc between electrodes and the furnace charge (or molten pool) to achieve the purpose of melting. This type of furnace is suitable for melting steel, alloys, and non-ferrous metals. The furnace cover beam is a crucial component of a DC electric arc furnace, its main function being to support the furnace lid and assist in heat dissipation. However, during the smelting process, due to the high temperatures, the furnace cover beam of a DC electric arc furnace is prone to thermal expansion and contraction, leading to cracking.
[0026] To address the problem of beam ring cracking, existing technologies have employed various measures. For example, spring supports are added to the edge of the beam ring, or universal joints are used to connect the furnace cover and the furnace body. However, these structural designs result in a complex furnace cover structure, which, being similarly affected by high temperatures, is still prone to cracking.
[0027] In view of this, this utility model embodiment provides a DC electric arc furnace, which aims to solve the problem of easy cracking of the beam ring in the prior art while maintaining the simplicity of the furnace cover structure.
[0028] Please see Figure 1 and Figure 2 The DC electric arc furnace includes a furnace body 1, a furnace cover 2, and a beam ring 3. The top of the furnace body 1 is open, and the interior has a receiving cavity 11 for smelting the material. The furnace cover 2 is fitted onto the top of the furnace body 1, and has a through hole 21 through which the motor rod passes. The beam ring 3 is located at the edge of the furnace cover 2 and serves to support the furnace cover 2. The interior of the beam ring 3 is designed as a hollow structure, forming a flow channel 31 for water supply, and is equipped with a water inlet 32 and a water outlet 33, both of which are connected to the flow channel 31 to achieve the circulation of cooling water, thereby effectively reducing the impact of high temperature on the beam ring 3 and reducing the risk of cracking caused by thermal expansion and contraction. This design improves the durability of the beam ring 3 while ensuring the simplicity of the edge structure of the furnace cover 2.
[0029] In actual operation, the furnace cover 2 is tightly closed onto the top of the furnace body 1, at which point the beam ring 3 will support the furnace cover 2. Next, check whether the inlet 32 and outlet 33 are correctly connected to the external cooling water system; then, ensure that the motor rod passes through the through hole 21 on the furnace cover 2 and is properly inserted. Start the cooling water circulation system, injecting cooling water into the flow channel 31 inside the beam ring 3 through the inlet 32. The water flows through the flow channel 31 and is discharged from the outlet 33, thus forming a continuous cooling cycle. This process can reduce the thermal expansion and contraction effect of the beam ring 3 caused by high temperatures, thereby reducing the possibility of cracking. During use, it is necessary to regularly check whether the quick connector 5 of the inlet 32 and outlet 33 is secure, and whether the cooling water flow rate is normal, to ensure stable operation of the equipment.
[0030] This embodiment of the invention optimizes the structure of the beam ring 3 by adopting an internally hollow design with flow channels 31, thus solving the problem of thermal expansion and contraction caused by high temperatures in traditional beam ring 3s. By providing an inlet 32 and an outlet 33 on the beam ring 3 and connecting it to an external cooling water system, the cooling water circulation is achieved, thereby reducing the temperature fluctuation range of the beam ring 3. Furthermore, the beam ring 3 itself is used to support the furnace cover 2; that is, the beam ring 3 not only supports the furnace cover 2 but also has excellent heat dissipation capabilities, effectively avoiding thermal expansion and contraction caused by temperature changes, thereby significantly improving the service life of the beam ring. In addition, the internal flow channels 31 of the beam ring 3 simplify the structure and reduce the structural burden on the edge of the furnace cover 2. This improvement not only simplifies the structure of the furnace cover 3 edge but also enhances the reliability of equipment operation.
[0031] In some embodiments, please refer to Figure 1 and Figure 3 To better support the furnace cover 2 and prevent the beam ring 3 from bending due to its hollow interior, the way the beam ring 3 supports the furnace cover 2 has been optimized. Specifically, the furnace cover 2 includes an inner spherical surface 22 and an outer spherical surface 23, as well as a first inclined surface 24 connecting the inner spherical surface 22 and the outer spherical surface 23; the first inclined surface 24 faces the outside of the receiving cavity 11, and the first inclined surface 24 and the top surface 12 of the furnace body 1 form an acute angle; wherein, the beam ring 3 abuts between the first inclined surface 24 of the furnace cover 2 and the top surface 12 of the furnace body 1.
[0032] Since the beam ring 3 abuts between the first inclined surface 24 of the furnace cover 2 and the top surface 12 of the furnace body 1, the pressure exerted on the beam ring 3 by the furnace cover 2 and the furnace body 1 can be reduced. Furthermore, the stress distribution of the beam ring 3 is more uniform, thereby effectively avoiding deformation or damage caused by local stress concentration. In addition, the design of the first inclined surface 24 can also guide heat to dissipate outwards, further reducing the thermal expansion and contraction effect of the beam ring 3 caused by high temperature.
[0033] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 3 To enhance the stability of the beam ring 3 between the furnace cover 2 and the furnace body 1, the beam ring 3 is fitted between the furnace cover 2 and the furnace body 1. Specifically, the beam ring 3 has a second inclined surface 34 that fits into the first inclined surface 24 of the furnace cover 2 and a bottom surface 35 that fits into the top surface 12 of the furnace body 1, as well as a connecting surface connecting the second inclined surface 34 and the bottom surface 35; wherein, the water inlet 32 and the water outlet 33 are distributed on the connecting surface.
[0034] This embodiment of the invention improves the installation stability of the beam ring 3 by providing a second inclined surface 34 and a bottom surface 35 on the beam ring 3, which are respectively in close contact with the first inclined surface 24 of the furnace cover 2 and the top surface 12 of the furnace body 1. The design of the connecting surface not only facilitates the arrangement of the water inlet 32 and the water outlet 33, but also further enhances the overall structural strength of the beam ring 3.
[0035] In some embodiments, please refer to Figure 1 and Figure 2 The inlet 32 and outlet 33 are arranged opposite each other in the diameter direction of the furnace cover 2.
[0036] This embodiment of the invention achieves uniform flow of cooling water within the internal flow channel 31 of the beam ring 3 by aligning the inlet 32 and outlet 33 opposite each other along the diameter of the furnace cover 2. This arrangement ensures a stable circulation path for the water flow throughout the flow channel 31, preventing uneven cooling caused by excessively fast or slow local water flow rates. Furthermore, the symmetrical positions of the inlet 32 and outlet 33 result in a more balanced heat distribution within the beam ring 3, further reducing thermal stress concentration caused by temperature differences.
[0037] In some embodiments, please refer to Figure 1 and Figure 2 The inlet 32 and outlet 33 are each equipped with a quick connector 5.
[0038] In practical use, when it is necessary to replace or repair the cooling water pipes, the operation can be completed simply by plugging and unplugging the quick connector 5, without the need for additional tools, significantly reducing downtime. Furthermore, the quick connector 5 has excellent sealing performance, effectively preventing cooling water leakage and ensuring the stable operation of the cooling system. This design improvement further enhances the overall reliability and practicality of the DC electric arc furnace, providing users with a more convenient operating experience.
[0039] This embodiment of the invention achieves convenient connection and disassembly of the cooling water system by providing quick connectors 5 at the inlet 32 and outlet 33. The design of the quick connectors 5 not only simplifies the operation process but also improves the efficiency of equipment maintenance.
[0040] In some embodiments, please refer to Figure 1and Figure 3 The DC electric arc furnace also includes a cold water connection hose 6 and a hot water connection hose 7. The cold water connection hose 6 is connected to the water inlet 32 to supply cold water into the flow channel 31; the hot water connection hose 7 is connected to the water outlet 33 to draw out the hot water from the flow channel 31.
[0041] The inclusion of cold water connection hose 6 and hot water connection hose 7 further optimizes the operating efficiency of the cooling system. Cold water connection hose 6 ensures a continuous and stable flow of cooling water into the flow channel 31 inside the beam ring 3, effectively absorbing heat generated by high temperatures. Hot water connection hose 7 quickly draws the heat-absorbing water out, preventing heat accumulation within the beam ring 3 and maintaining its temperature within a relatively stable range. This design not only improves cooling performance but also reduces thermal expansion and contraction caused by temperature fluctuations, further extending the service life of the beam ring 3.
[0042] In some embodiments, please refer to Figure 1 and Figure 2 To better manage and utilize the cooling water, the DC electric arc furnace is also equipped with a water tank 8. The water tank 8 is connected to a hot water connection hose 7 and is used to store the hot water flowing out from the outlet 33.
[0043] In some embodiments, please refer to Figure 1 and Figure 2 The bottom of the water tank 8 is equipped with a water inlet 81 for drawing water out of the tank. This design allows hot water to be directed to different locations according to actual needs, such as being discharged to an external cooling system for cooling and then recycled. This hot water can be used for workers' showers after get off work or directly for other production processes.
[0044] In some embodiments, please refer to Figure 1 and Figure 2 To further enhance the overall performance of the equipment, an insulation layer is typically installed on the outside of the water tank 8. This insulation layer effectively reduces heat loss during storage, thus maintaining water temperature stability. This not only helps improve the efficiency of the cooling system but also reduces energy consumption. Simultaneously, the insulation layer design prevents external environmental interference with the water temperature inside the water tank 8, ensuring more reliable operation of the cooling system.
[0045] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A DC electric arc furnace, characterized in that, include: The furnace body has an open top and an internal cavity for holding the material to be smelted. A furnace cover that fits over the top of the furnace body; the furnace cover has a through hole for a motor rod to pass through; A beam ring is provided at the edge of the furnace cover and supports the furnace cover; The beam ring is hollow inside and has a water flow channel. The beam ring is provided with a water inlet and a water outlet, which are respectively connected to the flow channel.
2. The DC electric arc furnace according to claim 1, characterized in that, The furnace cover includes an inner spherical surface on the inside and an outer spherical surface on the outside, as well as a first inclined surface connecting the inner spherical surface and the outer spherical surface; the first inclined surface faces the outside of the receiving cavity, and the first inclined surface and the top surface of the furnace body form an acute angle; The beam ring abuts between the first inclined surface of the furnace cover and the top surface of the furnace body.
3. The DC electric arc furnace according to claim 2, characterized in that, The beam ring has a second inclined surface that fits into the first inclined surface of the furnace cover and a bottom surface that fits into the top surface of the furnace body, as well as a connecting surface that connects the second inclined surface and the bottom surface; The inlet and the outlet are respectively located on the connecting surface.
4. The DC electric arc furnace according to claim 1, characterized in that, The water inlet and the water outlet are arranged opposite each other in the diameter direction of the furnace cover.
5. The DC electric arc furnace according to claim 1, characterized in that, The beam ring protrudes upward relative to the edge of the furnace cover to form a protrusion, and the water inlet and the water outlet are located on the protrusion.
6. The DC electric arc furnace according to claim 1, characterized in that, The inlet and outlet are each equipped with a quick connector.
7. The DC electric arc furnace according to claim 6, characterized in that, Also includes: A cold water connection hose is connected to the inlet to supply cold water into the flow channel; A hot water connection hose is connected to the outlet to draw hot water out of the flow channel.
8. The DC electric arc furnace according to claim 7, characterized in that, It also includes a water tank, which is connected to the hot water connection hose to store the hot water flowing from the outlet.
9. The DC electric arc furnace according to claim 8, characterized in that, The bottom of the water tank is provided with a water inlet, which is used to draw water out of the water tank.
10. The DC electric arc furnace according to claim 8, characterized in that, The water tank is equipped with an insulation layer on the outside.