Vacuum induction melting furnace input electric rotating shaft assembly structure

Abstract

The utility model discloses a vacuum induction smelting furnace electricity inlet rotating shaft assembly structure, including inner electrode tube, the inner electrode tube outer surface is closely equipped with the installation of inner insulating tube, one end of inner insulating tube of the inner electrode tube is equipped with the installation of one insulating sleeve. The utility model discloses a vacuum induction smelting furnace electricity inlet rotating shaft assembly structure can make the current can be efficiently passed through the shaft body and is delivered to the induction coil or other conductive components. Its structural features include the coaxial design of inner electrode tube and outer electrode tube and inner insulating sleeve, which not only ensures the effective transmission of electric energy, but also improves the stability and safety of the overall structure. The research and development target of the vacuum induction smelting furnace electricity inlet rotating shaft assembly structure is mainly to improve the equipment performance and stability, facilitate maintenance and upgrading, improve production efficiency and reduce energy consumption, and meet the needs of complex process.

Description

Technical Field

[0001] This utility model relates to the field of vacuum induction melting furnace technology, and in particular to the assembly structure of the electric inlet shaft of a vacuum induction melting furnace. Background Technology

[0002] Vacuum induction melting (VIM) furnaces have become indispensable tools in numerous high-tech industries, especially those requiring extremely high material purity and precision. Their applications range from aerospace and defense to nuclear energy and electronics, each benefiting from the unique capabilities of VIM furnaces. In the aerospace industry, VIM furnaces are crucial for producing high-performance alloys and specialty steels that can withstand extreme conditions. These materials are used to manufacture aircraft engines, structural components, and spacecraft parts, where reliability and durability are paramount. The ability to melt and refine metals in a controlled vacuum environment ensures that the final product meets stringent quality standards.

[0003] The energizing shaft is also a crucial component of the induction melting furnace coil and a key factor affecting current transmission. The inner and outer electrodes are two concentric thick-walled copper tubes, which isolate the current between the copper tubes and between the copper tubes and the shaft sleeve. As a vital part for energizing the induction coil, the energizing shaft carries a low-voltage, high-current supply from the intermediate frequency power source. Furthermore, the tilting mechanism is directly connected to the energizing shaft. During induction coil operation, the tilting mechanism experiences a low-potential current flow, reducing the current used for induction heating. This results in decreased eddy currents in the heated metal solid, reduced heat generation, increased energy consumption, and low current efficiency. Consequently, all related mechanisms become energized, increasing the risk to operators. Therefore, we propose a new assembly structure for the energizing shaft of the vacuum induction melting furnace. Utility Model Content

[0004] The main purpose of this invention is to provide an assembly structure for the electric inlet shaft of a vacuum induction melting furnace, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: The assembly structure of the electric inlet shaft of a vacuum induction melting furnace includes an inner electrode tube. An inner insulating tube is tightly fitted onto the outer surface of the inner electrode tube. A first insulating sleeve is fitted onto one end of the inner insulating tube. A second insulating sleeve, an O-ring, a second spacer, another O-ring, a pressure sleeve, and an inner electrode nut are sequentially fitted onto the other end of the inner electrode tube. An outer electrode tube is fitted onto the outer side of the inner insulating tube, with its two ends nested inside the first and second insulating sleeves respectively to form a seal. The outer sides of the inner insulating tube are respectively fitted with the first and second insulating sleeves for compression sealing. An L-shaped tube is connected to one end of the outer surface of the outer electrode tube, and a return connector is connected to the other end. An outer insulating tube is tightly fitted onto the outer surface of the outer electrode tube. A shaft outer sleeve is fitted onto the outer side of the outer insulating tube, and a connection is made between the shaft outer sleeve and one end of the outer insulating tube. The outer electrode tube is separated by nested insulating partition rings at one end and by nested inner insulating sleeves at the other end. A circular pad, a first partition sleeve, another circular pad, and an outer insulating sleeve are nested sequentially on the outer surface of the outer electrode tube at the other end. The outer electrode nut is screwed onto the surface of the outer electrode tube for sealing. A fixing ring is provided on the outside of one end of the outer tube. A stop fixing ring is fixedly installed on the outside of the outer electrode tube. A spring washer and a screw insulating sleeve are sequentially fitted on the hexagonal head screw. The hexagonal head screw then passes through the hole on the stop fixing ring and the hole on the insulating partition ring before being screwed into the screw hole on the fixing ring. A rotary joint is connected to one end of the inner electrode tube. A water inlet connector is connected to the input end of the rotary joint. A rotating shaft seal is fitted on the outer surface of the outer tube. A washer and a screw-fitting nut are fitted at one end of the outer surface of the outer tube. A nut is screw-fitted on the side of the rotating shaft seal on the outer surface of the outer tube.

[0006] Preferably, the first insulating sleeve seals and presses one end of the outer electrode tube and the inner insulating tube together, and the other end is sealed by the second insulating sleeve and then tightened by the inner electrode nut. A cooling water return gap is left between the outer electrode tube and the inner insulating tube, and the cooling water return gap is connected to the L-shaped tube and the return connector.

[0007] Preferably, the inner electrode tube and the outer electrode tube are isolated and insulated from each other by an inner insulating tube, a first insulating sleeve, and a second insulating sleeve.

[0008] Preferably, the insulating partition ring seals and presses one end of the outer sleeve and the outer insulating tube, and seals the other end with the inner insulating sleeve and then tightens and presses the seal with the outer electrode nut, and a gap is reserved between the outer sleeve and the outer insulating tube.

[0009] Preferably, the internal hexagonal head screw is insulated from the stop retaining ring by a screw insulating sleeve, and the internal hexagonal head screw tightens and presses one end of the shaft sleeve onto the insulating partition ring by screwing it into the screw hole in the retaining ring.

[0010] Preferably, one end of the L-shaped tube and the inner electrode tube is connected to the induction coil, and one end of the inner electrode tube and the outer electrode tube is connected to the intermediate frequency power supply through an outer electrode clip.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention enables efficient current transmission through the shaft to the induction coil or other conductive components. Its structural features include the coaxial design of the inner and outer electrode tubes and an inner insulating sleeve, which not only ensures efficient power transmission but also improves the overall structural stability and safety. The development goals of the electric input shaft assembly structure for vacuum induction melting furnaces are primarily to improve equipment performance and stability, facilitate maintenance and upgrades, increase production efficiency and reduce energy consumption, and adapt to the needs of complex processes. Achieving these goals will help promote the further development of vacuum induction melting technology and provide more reliable technical support for the field of high-end materials preparation. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the electric inlet shaft assembly structure of the vacuum induction melting furnace of this utility model; Figure 2 The electric shaft assembly structure of the vacuum induction melting furnace of this utility model Figure 1 Enlarged view of point A in the middle; Figure 3 The electric shaft assembly structure of the vacuum induction melting furnace of this utility model Figure 1 Enlarged view at point B in the middle; Figure 4 The electric shaft assembly structure of the vacuum induction melting furnace of this utility model Figure 1 Enlarged view of point C in the middle.

[0013] In the diagram: 1. Inner electrode tube; 2. L-shaped tube; 3. No. 1 insulating sleeve; 4. Outer electrode tube; 5. Inner insulating tube; 6. Socket head cap screw; 7. Spring washer; 8. Screw insulating sleeve; 9. Insulating partition ring; 10. Fixing ring; 11. Return connector; 12. Shaft outer sleeve; 13. Outer insulating tube; 14. Shaft seal; 15. Nut; 16. Inner insulating sleeve; 17. Circular washer; 18. First spacer; 19. Washer; 20. Compression nut; 21. Outer insulating sleeve; 22. Outer electrode nut; 23. No. 2 insulating sleeve; 24. O-ring; 25. Second spacer; 26. Compression sleeve; 27. Inner electrode nut; 28. Rotary joint; 29. ​​Water inlet connector. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0015] Example: Figure 1-4 As shown, the assembly structure of the electric inlet shaft of the vacuum induction melting furnace includes an inner electrode tube 1. An inner insulating tube 5 is tightly fitted onto the outer surface of the inner electrode tube 1. An insulating sleeve 3 is fitted onto one end of the inner electrode tube 1 at the inner insulating tube 5. A second insulating sleeve 23, an O-ring 24, a second spacer 25, an O-ring 24, a pressure sleeve 26, and an inner electrode nut 27 are sequentially fitted onto the other end of the inner electrode tube 1 at the inner insulating tube 5. An outer electrode tube 4 is fitted onto the outer side of the inner insulating tube 5, and the inner sides of both ends of the outer electrode tube 4 are... The first insulating sleeve 3 and the second insulating sleeve 23 are nested on the outside of the inner insulating tube 5 to form a seal. The first insulating sleeve 3 and the second insulating sleeve 23 are respectively fitted on the outside of both ends of the inner insulating tube 5 and pressed tightly to seal. An L-shaped tube 2 is connected to one end of the outer surface of the outer electrode tube 4, and a return connector 11 is connected to the other end of the outer electrode tube 4. An outer insulating tube 13 is tightly fitted on the outer surface of the outer electrode tube 4. A shaft outer sleeve 12 is fitted on the outside of the outer insulating tube 13. One end of the shaft outer sleeve 12 and the outer insulating tube 13 are connected by an insulating sleeve. The outer end of the outer electrode tube 4 is separated by nested partition rings 9, and the other end is separated by nested inner insulating sleeves 16. The other end, located on the outer surface of the outer electrode tube 4, is also sequentially nested with a circular pad 17, a first spacer 18, another circular pad 17, and an outer insulating sleeve 21. These are then tightened and sealed to the surface of the outer electrode tube 4 by screwing on the outer electrode nut 22. One end of the outer sleeve 12 is provided with a fixing ring 10. A stop fixing ring is fixedly installed on the outside of the outer electrode tube 4. A spring washer 7 and a screw insulating sleeve 8 are sequentially fitted onto the internal hexagonal head screw 6. The hexagonal cylindrical head screw 6 passes through the hole on the stop fixing ring and the hole on the insulating partition ring 9 in sequence, and is then screwed into the screw hole on the fixing ring 10. One end of the inner electrode tube 1 is connected to a rotary joint 28, and the input end of the rotary joint 28 is connected to a water inlet joint 29. A rotating shaft seal 14 is fitted on the outer surface of the shaft sleeve 12. A washer 19 is fitted on one end of the outer surface of the shaft sleeve 12, and a compression nut 20 is screwed on. A nut 15 is screwed on the outer surface of the shaft sleeve 12 on one side of the rotating shaft seal 14. The first insulating sleeve 3 seals and presses one end of the outer electrode tube 4 and the inner insulating tube 5 together, and the other end is sealed by the second insulating sleeve 23 and then tightened by the inner electrode nut 27. A cooling water return gap is left between the outer electrode tube 4 and the inner insulating tube 5. The cooling water return gap is connected to the L-shaped tube 2 and the return connector 11. Specifically, the inner insulating sleeve 3 is fitted at one end between the outer electrode tube 4 and the inner insulating tube 5, and the insulating sleeve 23 is fitted at the other end between the outer electrode tube 4 and the inner insulating tube 5. At one end of the inner insulating sleeve 16, a circular pad 17, a first spacer 18, a circular pad 17, and an outer insulating sleeve 21 are sequentially stacked. Finally, the outer electrode nut 22 is screwed onto the outer electrode tube 4 to press and seal the port, thereby ensuring that cooling water does not leak between the outer electrode tube 4 and the inner insulating tube 5. At the same time, there is no electrical conductivity between the outer electrode tube 4 and the inner electrode tube 1. The cooling water that is cooled and returned flows into the gap between the inner insulating tube 5 and the outer electrode tube 4 through the L-shaped pipe 2, and then flows out to the outside through the return connector 11 for cooling. After cooling, it is sent into the inner electrode tube 1 through the circulation pump and the water inlet connector 29, and introduced into the induction coil to play a cooling role.

[0016] The inner electrode tube 1 and the outer electrode tube 4 are isolated and insulated from each other by the inner insulating tube 5, the first insulating sleeve 3 and the second insulating sleeve 23; Specifically, the inner electrode tube 1 and the outer electrode tube 4 are insulated, and the L-shaped tube 2 is connected to the outer electrode tube 4. The electrode is connected to one end of the induction coil through one end of the L-shaped tube 2, and one end of the inner electrode tube 1 is connected to the other end of the induction coil to form a circuit.

[0017] The insulating partition ring 9 seals and presses one end of the shaft outer sleeve 12 and the outer insulating tube 13, and seals the other end through the inner insulating sleeve 16 and then tightens and presses the seal through the outer electrode nut 22, with a gap reserved between the shaft outer sleeve 12 and the outer insulating tube 13. Specifically, the main purpose of this structure is to insulate the outer electrode tube 4 from the outer sleeve tube 12, preventing the current on the outer electrode tube 4 from flowing into the vacuum induction furnace. This structure needs to be fixed to the vacuum induction furnace by screws through the fixing ears on the rotating shaft seal 14, so that no current will flow into the vacuum induction furnace, avoiding the risk of electric shock and leakage.

[0018] The internal hexagonal head screw 6 is insulated from the stop retaining ring by the screw insulating sleeve 8, and the internal hexagonal head screw 6 tightens and presses one end of the shaft outer sleeve 12 onto the insulating partition ring 9 by screwing it into the screw hole in the retaining ring 10. Specifically, the function of the screw insulating sleeve 8 is to prevent electrical connection between the hexagon socket head cap screw 6 and the stop retaining ring. Since the hexagon socket head cap screw 6 needs to connect to the retaining ring 10, and the retaining ring 10 is metal welded to the shaft outer sleeve 12, this prevents the outer electrode tube 4 from being electrically connected to the shaft outer sleeve 12 through the hexagon socket head cap screw 6, thus providing insulation. The main function of the hexagon socket head cap screw 6 is to connect the shaft outer sleeve 12 and fix it to the outside of the rotating shaft seal 14. The inner insulating sleeve 16, the circular washer 17, the first spacer 18, and the outer insulating sleeve 21 provide isolation and insulation. Then, the outer electrode nut 22 is used to tighten and fix it, so that the shaft outer sleeve 12 is stably sleeved on the outside of the outer insulating tube 13.

[0019] L-shaped tube 2 and one end of the inner electrode tube 1 are connected to the induction coil, and one end of the inner electrode tube 1 and one end of the outer electrode tube 4 are connected to the intermediate frequency power supply through the inner and outer electrode clips of the conductive copper busbar. Specifically, one end of the L-shaped tube 2 is connected to one end of the induction coil, and one end of the inner electrode tube 1 is connected to the other end of the induction coil. The input current of the inner electrode tube 1 and the outer electrode tube 4 is connected to the intermediate frequency power supply through the conductive copper busbar inner and outer electrode clips.

[0020] It should be noted that this utility model is an assembly structure for the power input shaft of a vacuum induction melting furnace. In use, the inner electrode tube 1 and the outer electrode tube 4 are respectively connected to the conductive copper busbar electrode clips, and connected to the intermediate frequency power supply to form an intermediate frequency power supply, conductive copper busbar outer electrode clips, outer electrode tube 4, induction coil, inner electrode tube 1, conductive copper busbar inner electrode clips, and conductive copper busbar intermediate frequency power supply current loop. Cooling water enters the inner electrode tube 1 through the water inlet connector 29 and then enters the induction coil water inlet. After flowing through the induction coil, the cooling water flows back to the power input shaft through the L-shaped pipe 2 (that is, the gap between the outer electrode tube 4 and the inner insulating tube 5), and then flows out through the return connector 11 on the outer electrode tube 4 through the gap for cooling and then returns to the starting end of the cooling water for circulation and cooling. It has the dual functions of conducting electricity and introducing cooling water. It is connected to the current collection device and cooling water pipe outside the vacuum melting chamber, and connected to the induction coil inside the vacuum melting chamber, introducing intermediate frequency current and cooling water into the induction coil. The rotation of the concentric electric shaft is hydraulically driven. The hydraulic tilting device can rotate the shaft, thereby tilting the crucible. The tilting angle is 0° to 105°.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An assembly structure for the electric inlet shaft of a vacuum induction melting furnace, characterized in that: The device includes an inner electrode tube (1), on the outer surface of which an inner insulating tube (5) is tightly fitted. An insulating sleeve (3) is fitted onto one end of the inner electrode tube (1) at the inner insulating tube (5). A second insulating sleeve (23), an O-ring (24), a second spacer (25), another O-ring (24), a pressure sleeve (26), and an inner electrode nut (27) are sequentially fitted onto the other end of the inner electrode tube (1) at the inner insulating tube (5). An outer electrode tube (4) is fitted onto the outer side of the inner insulating tube (5), with the inner sides of both ends of the outer electrode tube (4) nested within the first insulating sleeve (3). The inner insulating tube (5) and the outer side of the second insulating sleeve (23) form a seal. The outer sides of the two ends of the inner insulating tube (5) are respectively fitted with the first insulating sleeve (3) and the second insulating sleeve (23) and pressed tightly to seal. One end of the outer surface of the outer electrode tube (4) is connected to an L-shaped tube (2), and the other end of the outer electrode tube (4) is connected to a return connector (11). The outer surface of the outer electrode tube (4) is tightly fitted with an outer insulating tube (13). The outer side of the outer insulating tube (13) is fitted with a shaft outer sleeve (12). One end of the shaft outer sleeve (12) and the outer insulating tube (13) are connected by an insulating partition ring ( 9) The two ends are nested and separated by an inner insulating sleeve (16). The other end is located on the outer surface of the outer electrode tube (4) and is also nested with a circular pad (17), a first spacer (18), a circular pad (17) and an outer insulating sleeve (21) in sequence. The outer electrode nut (22) is screwed onto the surface of the outer electrode tube (4) to press and seal it. One end of the shaft sleeve tube (12) is provided with a fixing ring (10). The outer side of the outer electrode tube (4) is fixedly installed with a stop fixing ring. The inner hexagonal cylindrical head screw (6) is provided with a spring washer (7) and a screw insulating sleeve (8) in sequence. The head screw (6) passes through the hole on the stop fixing ring and the hole on the insulating partition ring (9) in sequence and is screwed into the screw hole on the fixing ring (10). One end of the inner electrode tube (1) is connected to a rotary joint (28). The input end of the rotary joint (28) is connected to a water inlet joint (29). The outer surface of the shaft sleeve (12) is fitted with a rotating shaft seal (14). One end of the outer surface of the shaft sleeve (12) is fitted with a washer (19) and a screw-fitting nut (20). The outer surface of the shaft sleeve (12) is located on the side of the rotating shaft seal (14) and a screw-fitting nut (15) is screw-fitted.

2. The assembly structure of the electric inlet shaft of the vacuum induction melting furnace according to claim 1, characterized in that: The first insulating sleeve (3) seals and presses one end of the outer electrode tube (4) and the inner insulating tube (5), and seals the other end with the second insulating sleeve (23) and then tightens and presses the inner electrode nut (27) to make it sealed. A cooling water return gap is left between the outer electrode tube (4) and the inner insulating tube (5), and the cooling water return gap is connected to the L-shaped tube (2) and the return connector (11).

3. The assembly structure of the electric inlet shaft of the vacuum induction melting furnace according to claim 2, characterized in that: The inner electrode tube (1) and the outer electrode tube (4) are isolated and insulated from each other by an inner insulating tube (5), a first insulating sleeve (3) and a second insulating sleeve (23).

4. The vacuum induction melting furnace power input shaft assembly structure according to claim 3, characterized in that: The insulating partition ring (9) seals and presses one end of the shaft outer sleeve (12) and the outer insulating tube (13), and seals the other end through the inner insulating sleeve (16) and then tightens and presses the seal through the outer electrode nut (22), and a gap is reserved between the shaft outer sleeve (12) and the outer insulating tube (13).

5. The assembly structure of the electric inlet shaft of the vacuum induction melting furnace according to claim 4, characterized in that: The internal hexagonal head screw (6) is insulated from the stop retaining ring by the screw insulating sleeve (8), and the internal hexagonal head screw (6) tightens and presses one end of the shaft sleeve (12) onto the insulating partition ring (9) by screwing it into the screw hole in the retaining ring (10).

6. The assembly structure of the electric inlet shaft of the vacuum induction melting furnace according to claim 5, characterized in that: The L-shaped tube (2) and the inner electrode tube (1) are connected to the induction coil at one end, and the inner electrode tube (1) and the outer electrode tube (4) are connected to the intermediate frequency power supply through the outer electrode clip.

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