Energy-saving crucible for vacuum suspension smelting

Abstract

The energy-saving crucible for vacuum suspension smelting comprises a circumferential side wall, a crucible bottom and an upper fixing ring, the circumferential side wall comprises inner wall strips, outer wall plates and side sealing pieces, the inner wall strips and the outer wall plates are in one-to-one correspondence, the inner wall strips are made of oxygen-free copper, the outer wall plates are made of zirconium oxide, and cooling structures are arranged on the outer wall surfaces of the inner wall strips. The side sealing piece is clamped between the inner wall strip and the outer wall plate; the crucible bottom comprises an inner bottom sheet, an outer base and a bottom sealing piece, the inner bottom sheet is attached to the inner side of the bottom of the inner wall strip and installed on the outer base, the outer base is fixedly connected with the outer wall plate in the outer circumferential direction, the inner bottom sheet is made of oxygen-free copper, a heat dissipation structure is arranged on the lower bottom face of the inner bottom sheet, and the bottom sealing piece is clamped between the inner bottom sheet and the outer base; the upper fixing ring is a zirconium oxide lantern ring, is attached to the outer side of the upper portion of the outer wall plate and is fixedly connected with the outer wall plate. The oxygen-free copper and the zirconium oxide are combined for use, the use amount of copper and power loss are reduced, external insulation treatment does not need to be carried out on the exterior of the crucible, and energy is greatly saved and consumption is greatly reduced during smelting.

Description

Technical Field

[0001] The present invention relates to the field of casting technology, and in particular to a crucible structure capable of significantly saving energy and reducing consumption during vacuum suspension melting. Background Art

[0002] The vacuum suspension melting furnace is an important equipment for achieving pure melting. The emergence of vacuum suspension melting technology has promoted the development of preparation technology for high-purity, refractory, highly active, radioactive and other materials.

[0003] The smelting characteristics of a suspension furnace are that the molten material and a water-cooled copper crucible are placed together in a coil under a vacuum environment, and eddy currents are generated in the molten material and the copper crucible using the principle of induction heating. By utilizing the mutual repulsion of the induced magnetic fields of the molten material and the copper crucible, the molten material and the crucible wall are separated, achieving a semi-suspension effect with only a small amount of contact at the base, thereby achieving the purpose of high-purity smelting. However, during the smelting process, the copper crucible is also a heavy load, and the induced eddy currents inside it generate resistive heat, consuming a large amount of power. Moreover, the existing copper crucible adopts an integrated structure, which is very difficult to repair and maintain, and it is difficult to take targeted measures. This not only reduces work efficiency but also significantly increases the cost of repair and maintenance.

[0004] Therefore, how to significantly save energy and reduce consumption during vacuum suspension melting is an issue that the industry urgently needs to solve. Summary of the Invention

[0005] A main purpose of the present invention is to overcome at least one of the above-mentioned defects of the prior art and provide an energy-saving crucible for vacuum suspension melting that can significantly save energy and reduce consumption during vacuum suspension melting.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: According to one aspect of the present invention, there is provided an energy-saving crucible for vacuum suspension melting, comprising: A circumferential side wall, comprising eight or more inner wall strips, eight or more outer wall plates, and a side seal, wherein the inner wall strips correspond to the outer wall plates one-to-one, the inner wall strips are made of oxygen-free copper, and the outer wall plates are made of zirconia. A cooling structure is provided on the outer wall surface of the inner wall strips, and the side seal is sandwiched between the inner wall strips and the outer wall plates and is used to seal the cooling structure; The crucible bottom comprises an inner bottom sheet, an outer base, and a bottom seal. The inner bottom sheet is abutted against the inner side of the bottom of the inner wall strip and is mounted on the outer base. The outer base is connected and fixed to the outer wall plate in the outer circumferential direction. The inner bottom sheet is made of oxygen-free copper, and a heat dissipation structure is provided on the lower bottom surface of the inner bottom sheet. The bottom seal is sandwiched between the inner bottom sheet and the outer base and is used to seal the heat dissipation structure. An upper fixing ring is a sleeve ring made of zirconium oxide. The upper fixing ring is attached to the outer side of the upper portion of the outer wall plate and is fixedly connected to the outer wall plate.

[0007] According to a specific embodiment of the present invention, the side seals and the bottom seals are both ceramic fiber sealing pads.

[0008] According to a specific embodiment of the present invention, the cooling structure and the heat dissipation structure both include an inlet and an outlet, and coolant flows into both.

[0009] According to a specific embodiment of the present invention, the cooling liquid in the cooling structure flows from bottom to top.

[0010] According to a specific embodiment of the present invention, there are more than two inner bottom sheets, and mica material is sandwiched between any two of the inner bottom sheets for insulation, and any of the inner bottom sheets is a semicircular or fan-shaped structure.

[0011] According to a specific embodiment of the present invention, the upper portion of the outer wall plate has a recessed structure, the upper fixing ring cooperates with the recessed structure, and the upper fixing ring is connected to the outer wall plate via a connector, and the connector is made of zirconium oxide.

[0012] According to a specific embodiment of the present invention, the outer base includes a working surface, a receiving surface and a supporting convexity. The working surface supports the inner bottom piece and is connected to the inner bottom piece. The receiving surface is located on the outside and has a step between the working surface. The receiving surface and the step act to clamp the inner wall strip and the concave part of the outer wall plate. The supporting convexity is located on the outer periphery of the outer base and protrudes at the bottom. The inner peripheral surface of the concave part of the outer wall plate is fitted with the outer peripheral surface of the supporting convexity and are connected by a connecting piece. The connecting piece is made of zirconia.

[0013] According to a specific embodiment of the present invention, the crucible has a truncated cone shape as a whole, the inner wall strips and the outer wall plate have a trapezoidal structure, and mica material is filled between any two inner wall strips for insulation.

[0014] According to a specific embodiment of the present invention, the inner side surface of the inner wall strip is an arc-shaped structure, and all the inner wall strips are combined together to form an inner hole with a large upper opening and a taper.

[0015] According to a specific embodiment of the present invention, the inner wall strips and the outer wall panels are connected and fixed in a one-to-one correspondence via connecting pieces, and the connecting pieces are made of zirconia.

[0016] As can be seen from the above technical solution, the advantages and positive effects of the energy-saving crucible for vacuum suspension melting of the present invention are: The present invention adopts a combination of oxygen-free copper and zirconium oxide to reduce copper usage and power loss, and the crucible does not need to be insulated externally. The split structure of the present invention is convenient for maintenance and is more targeted, thereby significantly saving energy and reducing consumption during vacuum suspension melting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the energy-saving crucible for vacuum levitation melting of the present invention.

[0018] Figure 2 The figure is a schematic cross-sectional view of an energy-saving crucible for vacuum levitation melting according to an embodiment of the present invention.

[0019] Figure 3 The diagram is a schematic diagram of the explosion structure of an embodiment of the energy-saving crucible for vacuum suspension smelting according to the present invention.

[0020] Figure 4 The figure is a schematic diagram of the overall structure of a crucible for vacuum suspension melting in the prior art.

[0021] Figure 5 The present invention is a schematic diagram of the use state of a crucible for vacuum suspension melting in the prior art. DETAILED DESCRIPTION

[0022] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0023] like Figures 1 to 3 As shown, the energy-saving crucible for vacuum levitation melting of the present invention comprises a circumferential side wall 1, a crucible bottom 2, and an upper fixing ring 3. The circumferential side wall 1 comprises more than eight inner wall strips 11, more than eight outer wall plates 12, and a side seal 13. The inner wall strips 11 correspond one-to-one with the outer wall plates 12. The inner wall strips 11 are made of oxygen-free copper, and the outer wall plates 12 are made of zirconium oxide. A cooling structure 4 is provided on the outer wall surface of the inner wall strips 11, with one cooling structure 4 between each pair of the inner wall strips 11 and the outer wall plates 12. The side seals 13 are sandwiched between the inner wall strips 11 and the outer wall plates 12 and are used to seal the cooling structures 4. The number of the side seals is the same as the number of the inner wall strips 11 and the outer wall plates 12, and they correspond one-to-one.

[0024] The crucible bottom 2 comprises an inner bottom sheet 21, an outer base 22, and a bottom seal 23. The inner bottom sheet 21 rests against the inner side of the bottom of the inner wall strip 11 and is mounted on the outer base 22. The outer base 22 is circumferentially connected and fixed to the outer wall plate 12. The inner bottom sheet 11 is made of oxygen-free copper, and a heat dissipation structure 5 is provided on the lower surface of the inner bottom sheet 21. The bottom seal 23 is sandwiched between the inner bottom sheet 21 and the outer base 22 and is used to seal the heat dissipation structure 5. There are multiple heat dissipation structures 5, each corresponding to one inner bottom sheet 21.

[0025] The upper fixing ring 3 is a sleeve ring made of zirconium oxide. The upper fixing ring 3 is attached to the outer side of the upper portion of the outer wall plate 12 and is fixedly connected to the outer wall plate 12 .

[0026] According to a specific embodiment of the present invention, the side seal 13 and the bottom seal 23 are both ceramic fiber sealing pads.

[0027] According to a specific embodiment of the present invention, the cooling structure 4 and the heat dissipation structure 4 both include an inlet and an outlet, and coolant is introduced into both. The inlet 51 of the heat dissipation structure 5 is on the inside, and the outlet 52 of the heat dissipation structure 5 is on the outside.

[0028] According to a specific embodiment of the present invention, the coolant flows from bottom to top in the cooling structure 4. The inlet 41 of the cooling structure 4 is at the bottom, and the outlet 42 of the cooling structure is at the outside.

[0029] According to a specific embodiment of the present invention, there are two or more inner bottom sheets 21, and mica material 8 is sandwiched between any two inner bottom sheets 21 for insulation, and any inner bottom sheet 21 is a semicircular or fan-shaped structure. The mica material 8 is a material with good insulation and temperature resistance.

[0030] According to a specific embodiment of the present invention, the upper portion of the outer wall plate 12 has a concave structure, the upper fixing ring 3 cooperates with the concave structure, and the upper fixing ring 3 is connected to the outer wall plate 12 via a connector, and the connector is made of zirconia.

[0031] According to a specific embodiment of the present invention, the outer base 22 includes a working surface, a receiving surface, and a supporting protrusion. The working surface supports the inner bottom sheet 11 and is connected to the inner bottom sheet 21. The receiving surface is located on the outside and has a step between it and the working surface. The receiving surface and the step act to clamp the inner wall strip 11 and the concave portion of the outer wall panel 12. The supporting protrusion is located on the periphery of the outer base 22 and has a protruding bottom. The inner circumference of the concave portion of the outer wall panel 12 is in contact with the outer circumference of the supporting protrusion and is connected by a connector 7. The connector 7 is made of zirconia. The connector 7 can be a bolt, threaded and fixed, with a protruding outer end.

[0032] According to a specific embodiment of the present invention, the crucible has a truncated cone shape as a whole, the inner wall strips 11 and the outer wall plate 12 have a trapezoidal structure, and mica material is filled between any two inner wall strips 11 for insulation.

[0033] According to a specific embodiment of the present invention, the inner side surface of the inner wall strips 11 is an arc-shaped structure, and all the inner wall strips 11 are combined together to form an inner hole with a large upper opening and a taper.

[0034] According to a specific embodiment of the present invention, the inner wall strips 11 and the outer wall panels 12 are fixed to each other via connectors 6, which are made of zirconium oxide and can be bolts, threaded connections, or countersunk fixations.

[0035] As can be seen from the above technical solution, the advantages and positive effects of the energy-saving crucible for vacuum suspension melting of the present invention are: The present invention uses oxygen-free copper and zirconium oxide in combination to reduce copper usage and power loss, and the crucible does not need to be insulated. The split structure of the present invention is easy to repair and maintain, and is more targeted, thereby significantly saving energy and reducing consumption during vacuum suspension melting. Figure 4 As shown, it is made of copper. The use of the crucible for vacuum suspension melting in the prior art is as follows Figure 5 As shown, the lower waterway needs to be welded together.

[0036] Compared with the crucible in the prior art, the crucible of the present invention has the following advantages: 1. The energy-saving crucible of the present invention consumes 30% of the copper in the crucible of the prior art.

[0037] 2. The power loss of the crucible in the prior art accounts for 50% of the input power, while the energy-saving crucible of the present invention has a loss of only 15%.

[0038] 3. Low maintenance costs. Taking a crucible for melting 30kg of titanium as an example, the existing crucible costs 4,000 yuan per piece and takes 20 days to manufacture. This is because the water channel requires deep drilling, which is time-consuming and prone to processing failure. The energy-saving crucible of the present invention has a loss cost of 500 yuan per piece and a processing cycle of 3 days. It is easy to process.

[0039] 4. The present invention is easy to maintain. In the prior art, the water channels at the lower ends of the crucible petals are welded together. Once a petal is damaged, the entire crucible needs to be dismantled, replaced, and re-welded. The energy-saving crucible of the present invention is fixed with bolts, so it does not need to be completely disassembled when replaced. Only the active area needs to be replaced.

[0040] 5. The outer layer of the crucible in the prior art is made of copper, which easily generates discharge between the crucible and the suspension coil, so insulation treatment is required. The outermost layer of the energy-saving crucible of the present invention has insulating properties and does not require insulation treatment.

[0041] The main material of the present invention is zirconium oxide, lined with oxygen-free copper plate, which reduces the use of oxygen-free copper, that is, reduces the carrier in the eddy current effect area, thereby significantly reducing power loss and improving smelting efficiency.

[0042] Those skilled in the art will appreciate that the specific structures and processes described in the foregoing detailed description are merely illustrative and non-limiting. Furthermore, those skilled in the art may combine the various technical features described above in various possible ways to create new technical solutions, or make other modifications, all of which fall within the scope of the present invention.

Claims

1. An energy-saving crucible for vacuum suspension melting, characterized in that: include: A circumferential side wall, comprising eight or more inner wall strips, eight or more outer wall plates, and a side seal, wherein the inner wall strips correspond to the outer wall plates one-to-one, the inner wall strips are made of oxygen-free copper, and the outer wall plates are made of zirconia. A cooling structure is provided on the outer wall surface of the inner wall strips, and the side seal is sandwiched between the inner wall strips and the outer wall plates and is used to seal the cooling structure; The crucible bottom comprises an inner bottom sheet, an outer base, and a bottom seal. The inner bottom sheet is abutted against the inner side of the bottom of the inner wall strip and is mounted on the outer base. The outer base is connected and fixed to the outer wall plate in the outer circumferential direction. The inner bottom sheet is made of oxygen-free copper, and a heat dissipation structure is provided on the lower bottom surface of the inner bottom sheet. The bottom seal is sandwiched between the inner bottom sheet and the outer base and is used to seal the heat dissipation structure. An upper fixing ring is a sleeve ring made of zirconium oxide. The upper fixing ring is attached to the outer side of the upper portion of the outer wall plate and is fixedly connected to the outer wall plate.

2. The energy-saving crucible for vacuum levitation melting according to claim 1, characterized in that: The side seals and the bottom seal are both ceramic fiber sealing pads.

3. The energy-saving crucible for vacuum levitation melting according to claim 1, characterized in that: The cooling structure and the heat dissipation structure both include an inlet and an outlet, and coolant flows into both.

4. The energy-saving crucible for vacuum levitation melting according to claim 3, characterized in that: The coolant in the cooling structure flows from bottom to top.

5. The energy-saving crucible for vacuum levitation melting according to claim 1, characterized in that: There are more than two inner bottom sheets, and mica material is sandwiched between any two of the inner bottom sheets for insulation. Any of the inner bottom sheets is a semicircular or fan-shaped structure.

6. The energy-saving crucible for vacuum levitation melting according to claim 1, characterized in that: The upper portion of the outer wall plate has a concave structure, the upper fixing ring cooperates with the concave structure, and the upper fixing ring is connected to the outer wall plate via a connecting piece, and the connecting piece is made of zirconium oxide.

7. The energy-saving crucible for vacuum levitation melting according to claim 1, characterized in that: The outer base includes a working surface, a receiving surface and a supporting convexity. The working surface supports the inner bottom plate and is connected to the inner bottom plate. The receiving surface is located on the outside and has a step between the receiving surface and the working surface. The receiving surface and the step act to clamp the inner wall strip and the concave part of the outer wall plate. The supporting convexity is located on the outer periphery of the outer base and protrudes at the bottom. The inner peripheral surface of the concave part of the outer wall plate is fitted with the outer peripheral surface of the supporting convexity and are connected by a connecting piece. The connecting piece is made of zirconia.

8. The energy-saving crucible for vacuum levitation melting according to claim 1, characterized in that: The crucible is in a truncated cone shape as a whole, the inner wall strips and the outer wall plate are in a trapezoidal structure, and mica material is filled between any two inner wall strips for insulation.

9. The energy-saving crucible for vacuum levitation melting according to claim 8, characterized in that: The inner side surface of the inner wall strip is an arc-shaped structure, and all the inner wall strips are combined together to form an inner hole with a large upper opening and a taper.

10. The energy-saving crucible for vacuum levitation melting according to claim 9, characterized in that: The inner wall strips and the outer wall panels are connected and fixed in a one-to-one correspondence via connecting pieces, and the connecting pieces are made of zirconia material.

Images