Crucible body gas circuit structure for inflation cooling

Abstract

The utility model belongs to the technical field of vacuum metallurgy, and relates to a crucible of a vacuum consumable electric arc furnace, in particular to a crucible body gas circuit structure for inflation cooling. The gas circuit structure comprises a gas filling pipeline and a pressure measuring pipeline which are the same in structure, the first end of a first vent hole is located on the side end face of a crucible flange, the first vent hole is vertically communicated with a vertically-arranged second vent hole, the lower end of the second vent hole is connected with a first gas pipe, and the first gas pipe surrounds the lower end face of a water jacket flange; the first air pipe is connected to a second air pipe extending downwards and vertically, the second air pipe is located on the outer wall of the crucible water jacket, and the lower end of the second air pipe is bent and communicated into the crucible body. Under the impact of high-speed water flow, the pipeline weldment does not generate fatigue cracks, the sealing part at the joint of the pipeline weldment and the barrel body is not scalded, and the risk of melting interruption or furnace body explosion caused by the fact that cooling water enters the crucible body is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum metallurgy technology, and relates to a vacuum self-consuming electric arc furnace crucible, specifically to a crucible body gas path structure for gas-filled cooling. Background Technology

[0002] Vacuum self-consuming electric arc furnace uses the heat generated by an electric arc to melt metal. The crucible body (made of copper) and the base (made of copper) are assembled and called a crystallizer. The liquid metal melted by the electric arc crystallizes into an ingot in the crystallizer, which is circulated with cooling water. In the early stage of ingot solidification, the molten pool and the crucible wall are in contact. The heat released by the solidification of the ingot is transferred to the cooling water through the crucible body and the base. To accelerate cooling, a stainless steel crucible water jacket is installed on the outer wall of the crucible body, with a 10mm gap between the water jacket and the outer wall. Outside the water jacket, there is an arc-stabilizing stainless steel cylinder. There is a sealing ring between the flange of the water jacket and the flange of the arc-stabilizing cylinder, and another sealing ring between the lower end face of the crucible flange and the flange of the melting station. This structure ensures that, under the action of the pressurized water pump at the bottom of the melting station, the cooling water flows at a high speed from the bottom of the crucible cylinder along the inner diameter of the water jacket, flows to the gap between the flange of the water jacket and the crucible flange (made of copper) of the crucible body, and then flows into the gap between the arc-stabilizing water jacket and the melting station, exiting the melting station from the outlet on the outside of the gap. This structure ensures sufficient cooling of the crucible body, thereby ensuring that the heat released by the solidification of the ingot is carried away by the cooling water, avoiding the risk of the copper crucible body being melted by the ingot.

[0003] However, after the ingot solidifies and shrinks, the heat transfer method between the ingot and the crucible wall changes from heat conduction to heat radiation. For a few multi-element alloys, where the density and melting point of the alloying elements differ greatly, this cooling method inevitably leads to compositional segregation. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and propose a gas path structure for a crucible body used for gas-cooling.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A gas path structure for a crucible body for gas filling and cooling includes a crucible body, a gas filling pipeline and a pressure measuring pipeline. A crucible flange is provided on the upper end face of the crucible body, and a crucible water jacket is fitted on the outside of the crucible body. A water jacket flange is provided on the upper end face of the crucible water jacket.

[0007] The gas filling pipeline and the pressure measuring pipeline have the same structure. Both the gas filling pipeline and the pressure measuring pipeline have a first vent hole arranged horizontally inside the crucible flange. The first end of the first vent hole is located on the side end face of the crucible flange. The first vent hole is vertically connected to a second vent hole arranged vertically. The second vent hole penetrates the lower end face of the crucible flange. The lower end of the second vent hole is connected to a first gas pipe. The first gas pipe surrounds the lower end face of the water jacket flange. The first gas pipe is connected to a second gas pipe extending vertically downward. The second gas pipe is located on the outer wall of the crucible water jacket. The lower end of the second gas pipe is bent and connected to the crucible body.

[0008] Furthermore, a KF connector is provided at the first end of the first vent.

[0009] Furthermore, the inflation line and the pressure measuring line are arranged opposite to each other, and a pressure sensor is provided at the upper end of the pressure measuring line.

[0010] Furthermore, a water-proof ring is provided between the lower end face of the crucible flange and the upper end face of the water jacket flange.

[0011] Furthermore, a gas pipe connecting block is provided between the lower end face of the crucible flange and the upper end face of the water jacket flange. The gas pipe connecting block includes a first connecting block and a second connecting block. The second connecting block is connected to the lower part of the first connecting block. The second vent hole includes a vertically arranged vertical through hole located in the first connecting block and a horizontally arranged horizontal through hole located in the second connecting block. The lower end of the vertical through hole is connected to the horizontal through hole, and the vertical through hole and the horizontal through hole are perpendicular to each other.

[0012] Furthermore, a sealing ring is provided on the upper end face of the tracheal connection block.

[0013] Furthermore, the first air pipe surrounds one-quarter of the circumference of the lower end face of the water jacket flange.

[0014] Furthermore, the second air tube is divided into a stainless steel tube segment and a copper tube segment. The stainless steel tube segment is located above the copper tube segment. A stainless steel connecting block is connected to the lower end of the stainless steel tube segment, and a copper connecting block is provided at the upper end of the copper tube segment. The stainless steel connecting block and the copper connecting block are screwed together.

[0015] Furthermore, a sealing ring is provided between the upper end face of the copper connecting block and the lower end face of the stainless steel connecting block.

[0016] Furthermore, the stainless steel pipe section includes an "S"-shaped bend.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] First, the gas path structure of the crucible body for gas-filled cooling provided by this utility model will not produce fatigue cracks in the pipe welds under the impact of high-speed water flow, and the seal at the connection with the cylinder will not melt, thus avoiding the risk of melting interruption or furnace explosion caused by cooling water entering the crucible body.

[0019] Secondly, for the gas-filling pipeline, during the entire ingot melting process, gas is introduced from outside the melting station into the gap between the ingot and the inner wall of the crucible. The heat of the ingot is transferred to the gas, which in turn is transferred to the crucible wall, and then to the high-speed flowing cooling water outside, thereby accelerating the cooling of the liquid metal and helping to reduce the segregation of the ingot composition. To ensure the normal combustion of the electric arc and the continuation of melting, the pressure measuring pipeline on the other side is used to measure the gas pressure. The pressure value is fed back to the input controller. The continuous and stable pressure will not damage the integrity of the molten pool at the top of the ingot and the continuity of the electric arc. Attached Figure Description

[0020] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0021] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 Main view of the gas-cooled crucible body and melting station assembly of this utility model;

[0023] Figure 2 This is a partial schematic diagram of the assembly of the gas-cooled crucible body and the melting station at part A of this utility model.

[0024] Figure 3 Side view of the gas-cooled crucible body and melting station assembly of this utility model;

[0025] Figure 4 This is a schematic diagram of the tracheal connection block of this utility model;

[0026] Figure 5 This is a schematic diagram of the KF connector structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the water-proof ring structure of this utility model;

[0028] Figure 7 This is a schematic diagram of the second trachea structure of this utility model;

[0029] Figure 8This is a schematic diagram of the connection structure between the copper connecting block and the copper pipe section of this utility model.

[0030] Wherein: 1 is KF connector; 2 is crucible body; 2-1 is crucible flange; 2-11 is first vent hole; 2-12 is second vent hole; 3 is melting station sealing ring; 4 is melting station; 5 is arc stabilizing water jacket sealing ring; 6 is water-proof ring; 7 is gas pipe connecting block; 8 is arc stabilizing water jacket; 9 is crucible water jacket; 10 is second gas pipe; 11 is pipe clamp; 12 is water outlet; 13 is stainless steel connecting block; 14 is copper connecting block; 15 is copper pipe section; 16 is hook; 17 is copper bottom pad; 18 is base plate; 19 is bottom water inlet pipe; 20 is first gas pipe. Detailed Implementation

[0031] Exemplary embodiments will be described in detail below. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples consistent with some aspects of this invention as detailed in the appended claims.

[0032] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Example

[0034] like Figure 1-3 As shown, a crucible body gas path structure for gas filling and cooling includes a crucible body 2, a gas filling pipeline and a pressure measuring pipeline. The upper end of the crucible body 2 is provided with a crucible flange 2-1, and the outside of the crucible body 2 is provided with a crucible water jacket 9. The upper end of the crucible water jacket 9 is provided with a water jacket flange.

[0035] The inflation pipeline and the pressure measuring pipeline have the same structure and are arranged opposite to each other. Both the inflation pipeline and the pressure measuring pipeline have a first vent 2-11 arranged horizontally inside the crucible flange 2-1. The first end of the first vent 2-11 is located on the side end face of the crucible flange 2-1. The first vent 2-11 is vertically connected to a second vent 2-12 arranged vertically. The second vent 2-12 penetrates the lower end face of the crucible flange 2-1. The lower end of the second vent 2-12 is connected to a first air pipe 20. The first air pipe 20 surrounds the lower end face of the water jacket flange. The first air pipe 20 is connected to a second air pipe 10 extending vertically downward. The second air pipe 10 is located on the outer wall of the crucible water jacket 9. The lower end of the second air pipe 10 is bent and connected to the inside of the crucible body 2.

[0036] In this embodiment, the lower part of the second gas pipe 10 is bent at 90 degrees and connected to the through hole on the side wall of the crucible body 2. The two are integrated by welding.

[0037] It should be further explained that the gas is introduced through the first vent 2-11 on the circumferential surface of the crucible flange 2-1 of the crucible body 2, and passes through the horizontal and vertical holes inside the crucible flange 2-1, the gas pipe connecting block 7 at the lower end face of the crucible flange 2-1, the second gas pipe 10, the stainless steel connecting block 13, the copper connecting block 14, and the copper pipe section 15 at the bottom of the crucible body 2, before entering the gap between the crucible body 2 and the bottom pad 17. A similar pipe is arranged on one side symmetrical to the crucible body axis, and the upper end of this pipe is connected to a pressure sensor for measuring the gas pressure inside the crucible body 2. The two symmetrical gas paths are installed on the outer wall of the stainless steel water jacket of the crucible body 2, avoiding the impact of high-speed water flow on the weld seams at the pipe connections.

[0038] Furthermore, such as Figure 5 As shown, a KF connector 1 is provided at the first end of the first vent 2-11.

[0039] In this embodiment: at the joint on the outer circumference of the crucible flange 2-1 of the crucible body 2, a KF joint as specified in ISO-2861-1 is used. When the crucible body 2 is loaded into the melting station, the gas charging pipeline, the pressure measuring pipeline and the crucible body 2 can be quickly connected as one unit. When it is unloaded from the furnace, the gas charging pipeline, the pressure measuring pipeline and the crucible body 2 can be quickly disconnected.

[0040] It should be noted that one end of the crucible flange 2-1 of the crucible body 2 uses a KF connector 1, and the other end uses a round flange structure. The round flange end face is machined with a sealing groove and six stepped through holes for installing hexagonal socket head cap bolts. The interior of the crucible flange 2-1 has two mutually perpendicular vent holes. The first vent hole 2-11 is horizontal and communicates with the flange connector, such as... Figure 4 As shown, the second vent hole 2-12 is machined vertically, the upper end of the second vent hole 2-12 is connected to the horizontal first vent hole 2-11, and the lower end of the second vent hole 2-12 is connected to the air pipe connecting block 7.

[0041] Furthermore, the inflation line and the pressure measuring line are arranged opposite to each other, and a pressure sensor is provided at the upper end of the pressure measuring line.

[0042] Furthermore, such as Figure 6 As shown, a water-proof ring 6 is provided between the lower end face of the crucible flange 2-1 and the upper end face of the water jacket flange.

[0043] In this embodiment, a water-proof ring 6 is installed on the lower end face of the crucible flange 2-1 of the crucible body 2 and the upper end face of the water jacket flange. The water-proof ring 6 isolates the high-speed water flow from the gas pipe connecting block, avoiding the impact of the high-speed water flow on the gas connecting block and the weld, and ensuring the reliability of the seal at this point.

[0044] Furthermore, such as Figure 4As shown, a gas pipe connecting block 7 is provided between the lower end face of the crucible flange 2-1 and the upper end face of the water jacket flange. The gas pipe connecting block 7 includes a first connecting block and a second connecting block. The second connecting block is connected to the lower part of the first connecting block. The second vent hole 2-12 includes a vertically arranged vertical through hole located in the first connecting block and a horizontally arranged horizontal through hole located in the second connecting block. The lower end of the vertical through hole is connected to the horizontal through hole. The vertical through hole and the horizontal through hole are perpendicular to each other.

[0045] In this embodiment: the gas connection block 7 is installed on the lower end face of the crucible flange 2-1 of the crucible body 2, and is made of stainless steel. The upper end face of the gas connection block 7 is machined with a sealing groove and six stepped holes for installing hexagonal socket head cap screws. The gas connection block 7 is screwed to the lower end face of the crucible flange 2-1.

[0046] Furthermore, a sealing ring is provided on the upper end face of the tracheal connection block 7.

[0047] Furthermore, the first air pipe 20 surrounds one-quarter of the circumference of the lower end face of the water jacket flange.

[0048] In this embodiment: the second gas pipe connected to the gas connecting block 7 in the horizontal direction travels along the outer wall of the crucible water jacket 9, at about a quarter of the circumference of the water jacket, the stroke is close to a quarter circle arc, the direction becomes vertically downward, along the pipe clamp 11 on the outer wall of the water jacket, and extends to the bottom stainless steel connecting block 13. At about 150mm from the connecting block, the gas pipe is bent from a straight pipe into an "S" shaped pipe.

[0049] Furthermore, such as Figure 7-8 As shown, the second air tube 10 is divided into a stainless steel tube section and a copper tube section. The stainless steel tube section is located above the copper tube section 15. The lower end of the stainless steel tube section is connected to a stainless steel connecting block 13. The upper end of the copper tube section 15 is provided with a copper connecting block 14. The stainless steel connecting block 13 and the copper connecting block 14 are connected.

[0050] In this embodiment: the upper end of the stainless steel connecting block 13 is connected to the stainless steel pipe section, and the lower end is connected to the copper connecting block 14 by two stainless steel hexagonal bolts. The lower end surface of the stainless steel connecting block is a flat surface with a finish of 3.2 μm. There is a through hole in the center of both the stainless steel connecting block 13 and the copper connecting block 14, and the two through holes are interconnected. A sealing groove is machined on the upper end surface of the copper connecting block 14, and a silicone sealing ring is installed in the groove. The lower end surface is connected to the copper pipe section 15, and the hole on the copper connecting block 14 is interconnected with the copper pipe section 15.

[0051] The bottom piping of crucible body 2 uses 15 sections of copper pipe, which utilizes the thermal conductivity of copper to reduce the temperature at the connection between the pipe and crucible body 2, allowing the seal at that point to operate at room temperature. The entire gas circuit can maintain reliable and stable long-term operation under conditions of high temperature on the inner wall of crucible body 2 and high-speed water flow on the outer wall of crucible body 2.

[0052] Furthermore, a sealing ring is provided between the upper end face of the copper connecting block 14 and the lower end face of the stainless steel connecting block 13.

[0053] In this embodiment: the lower end face of the stainless steel connecting block 13 and the copper connecting block 14 are connected by bolts. The upper end face of the copper connecting block 14 is machined with a sealing groove, and a silicone sealing ring is installed in the groove. The lower end face of the copper connecting block 14 is welded to the copper pipe section 15. After the copper pipe 15 extends downward for a certain distance, it is bent at 90 degrees, changing from a vertical direction to a horizontal direction, and inserted into the wall of the crucible body 2. The insertion point is welded to connect the horizontal copper pipe 15 and the crucible body 2 into one piece. The heat transferred into the copper gas pipe 15 inside the crucible body 2 is carried away by the surrounding water, ensuring the reliability of the seal.

[0054] Furthermore, the stainless steel pipe section includes an "S"-shaped bend.

[0055] In this embodiment, the second gas pipe 10 is machined into an "S" shape at a distance of 150mm from the bottom stainless steel connecting block 13. The advantage of this is that it can reduce the speed of the gas flow and avoid the gas flow from affecting the molten pool or electric arc in the crucible body 2. When the gas pipe joint needs to be repaired, it can supplement or compensate for the length of the gas pipe and increase the flexibility of the connection between the stainless steel pipe and the bottom copper joint.

[0056] In addition, the first gas pipe descends along the outer wall of the stainless steel water jacket of the crucible body 2. The area between the outer wall of the crucible water jacket 9 and the inner wall of the arc-stabilizing water jacket 8 forms a water storage area. The water in this area has no outlet. The second gas pipe 10 is not affected by the water flow in this area and will not vibrate. It is fixed to the outer wall of the water jacket by the pipe clamp 11.

[0057] It should be noted that there is an arc-stabilizing water jacket 8 outside the crucible water jacket 9, an arc-stabilizing water jacket sealing ring 5 between the water jacket flange and the arc-stabilizing water jacket flange, and a melting station sealing ring 3 between the lower end face of the crucible flange and the melting station flange. This structure can ensure that, under the action of the pressurized water pump at the bottom of the melting station 4, the cooling water flows upward from the bottom water inlet pipe 19 of the crucible body along the inner diameter of the crucible water jacket at a high speed, flows to the gap between the flange of the crucible water jacket 9 and the crucible flange (made of copper) of the crucible body 2, and then flows to the gap between the arc-stabilizing water jacket 8 and the melting station 4, and flows out of the melting station from the outlet 12 on the outside of the gap. The crucible body 2 is separated from the base plate 18 by the hook 16 (a copper base pad 17 is set above the base plate 18). This structure ensures sufficient cooling of the crucible body.

[0058] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0059] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A gas path structure for a crucible body used for gas-cooling, characterized in that, It includes a crucible body (2), an air filling pipeline and a pressure measuring pipeline. The upper end of the crucible body (2) is provided with a crucible flange (2-1), and the outside of the crucible body (2) is provided with a crucible water jacket (9). The upper end of the crucible water jacket (9) is provided with a water jacket flange. The gas filling pipeline and the pressure measuring pipeline have the same structure. Both the gas filling pipeline and the pressure measuring pipeline have a first vent hole (2-11) arranged horizontally inside the crucible flange (2-1). The first end of the first vent hole (2-11) is located on the side end face of the crucible flange (2-1). The second end of the first vent hole (2-11) is vertically connected to a second vent hole (2-12) arranged vertically. The second vent hole (2-12) is connected to a first air pipe (20). The first air pipe (20) surrounds the lower end face of the water jacket flange. The first air pipe (20) is connected to a second air pipe (10) extending vertically downward. The second air pipe (10) is located on the outer wall of the crucible water jacket (9). The lower end of the second air pipe (10) is bent and connected to the crucible body (2).

2. The gas path structure for a crucible body used for gas-cooling according to claim 1, characterized in that, A KF connector (1) is provided at the first end of the first vent (2-11).

3. The gas path structure for a crucible body used for gas-cooling according to claim 1, characterized in that, The inflation line and the pressure measuring line are arranged opposite to each other, and a pressure sensor is installed at the upper end of the pressure measuring line.

4. The gas path structure for a crucible body used for gas-cooling according to claim 1, characterized in that, A water-proof ring (6) is provided between the lower end face of the crucible flange (2-1) and the upper end face of the water jacket flange.

5. The gas path structure for a crucible body used for gas-cooling according to claim 1, characterized in that, A gas pipe connecting block (7) is provided between the lower end face of the crucible flange (2-1) and the upper end face of the water jacket flange. The gas pipe connecting block (7) includes a first connecting block and a second connecting block. The second connecting block is connected to the lower part of the first connecting block. The second vent hole (2-12) includes a vertically arranged vertical through hole located in the first connecting block and a horizontally arranged horizontal through hole located in the second connecting block. The lower end of the vertical through hole is connected to the horizontal through hole. The vertical through hole and the horizontal through hole are perpendicular to each other.

6. The gas path structure for a crucible body used for gas-cooling according to claim 5, characterized in that, A sealing ring is provided on the upper end face of the tracheal connection block (7).

7. The gas path structure for a crucible body used for gas-cooling according to claim 1, characterized in that, The first air pipe (20) surrounds one-quarter of the circumference of the lower end face of the water jacket flange.

8. The gas path structure for a crucible body used for gas-cooling according to claim 1, characterized in that, The second air tube (10) is divided into a stainless steel tube section and a copper tube section (15). The stainless steel tube section is located above the copper tube section (15). The lower end of the stainless steel tube section is connected to a stainless steel connecting block (13). The upper end of the copper tube section (15) is provided with a copper connecting block (14). The stainless steel connecting block (13) and the copper connecting block (14) are connected.

9. The gas path structure for a crucible body used for gas-cooling according to claim 8, characterized in that, A sealing ring is provided between the upper end face of the copper connecting block (14) and the lower end face of the stainless steel connecting block (13).

10. The gas path structure for a crucible body used for gas-cooling according to claim 8, characterized in that, The stainless steel pipe section includes an "S"-shaped bend.

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