Power supply configuration method and heating method of vacuum induction furnace

Abstract

The invention provides a power supply configuration method and a heating method for a vacuum induction furnace, and belongs to the technical field of metallurgical equipment.The outer side wall of a crucible of the vacuum induction furnace is sleeved with at least two independent electric heating mechanisms in the vertical direction, and the outer portion of the vacuum induction furnace is provided with a power supply. A corresponding independent control power supply cabinet is arranged corresponding to each independent electric heating mechanism, and a power supply connector of each independent electric heating mechanism is connected with a wire outlet end of the corresponding control power supply cabinet, so that a main power supply is formed, the requirement of a high-power power supply of the vacuum induction furnace can be met, and the problem that in the prior art, the vacuum induction furnace is inconvenient to use is effectively solved. The problem of vacuum corona discharge caused by overhigh power supply voltage is solved; the independent electric heating mechanisms can be respectively lifted out of the vacuum induction furnace during mounting and dismounting, so that the mounting, dismounting and overhauling are convenient; and the corresponding independent electric heating mechanisms can be independently controlled by controlling the power supply cabinet according to the heating process requirements, so that the heating process is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical equipment, and more specifically, to a power supply configuration method and a heating method for a vacuum induction furnace. Background Art

[0002] Industrial applications generally require high-power vacuum power supplies. Currently, the maximum power of vacuum induction power supplies is about 12500KW. However, its voltage should not exceed 950-1250V. If the voltage is too high, glow discharge will occur, making the equipment unable to work normally. At the same time, increased power will cause the current to increase rapidly and exceed the limit of the induction copper tube. Moreover, when the vacuum voltage is higher than 950 volts, vacuum corona or inter-electrode fire will occur, which greatly limits the large-scale vacuum power supply.

[0003] At present, in the actual application of vacuum induction furnaces, when a single furnace needs to have a higher power, the thyristor or IGBT power supply in the prior art cannot meet the high power requirement.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a vacuum induction furnace power supply configuration method and a heating method to solve the problem in the prior art that, in the actual application of the vacuum induction furnace, when a single furnace needs higher power, the existing thyristor or IGBT power supply cannot meet the high power requirement.

[0006] The present invention provides a method for configuring a power supply of a vacuum induction furnace, comprising the following steps:

[0007] On the outer side wall of the crucible of the vacuum induction furnace, at least two independent electric heating mechanisms are arranged in a vertical direction;

[0008] Leading the power connector of each independent electric heating mechanism arranged on the outer side wall of the crucible to the outside of the vacuum space of the vacuum induction furnace, and providing a corresponding control power cabinet corresponding to each independent electric heating mechanism outside the vacuum induction furnace;

[0009] The power connector of each independent electric heating mechanism is connected to the outlet terminal of the corresponding control power cabinet to complete the power configuration of the vacuum induction furnace.

[0010] In addition, a preferred solution is that at least two independent electric heating mechanisms are arranged in a vertical direction on the outer side wall of the crucible of the vacuum induction furnace, including:

[0011] According to the heating position area of ​​the crucible and the preset vacuum voltage limit, design a layout scheme of the independent electric heating mechanism on the outer side wall of the crucible; wherein the layout scheme includes the number of the independent electric heating mechanisms and the position of each independent electric heating mechanism on the outer side wall of the crucible;

[0012] According to the layout scheme, the independent electric heating mechanisms are arranged on the outer side wall of the crucible in sequence from top to bottom.

[0013] In addition, a preferred solution is that the independent electric heating mechanism includes a single IGBT or at least two single IGBTs connected in parallel or at least two single IGBTs connected in series.

[0014] In addition, a preferred solution is that the independent electric heating mechanism includes a thyristor vacuum power induction coil or at least two thyristor vacuum power induction coils connected in parallel or at least two thyristor vacuum power induction coils connected in series.

[0015] In addition, a preferred solution is that a magnetic yoke is provided outside the thyristor vacuum power supply induction coil.

[0016] In addition, a preferred solution is that when the independent electric heating mechanism includes at least two parallel thyristor vacuum power induction coils or at least two series thyristor vacuum power induction coils, the output impedance of each thyristor vacuum power induction coil to the corresponding control power cabinet is the same.

[0017] In addition, a preferred solution is that the power connector of each independent electric heating mechanism arranged on the outer side wall of the crucible is led out to the outside of the vacuum space of the vacuum induction furnace, including:

[0018] The connector of each independent electric heating mechanism is used as a power connector and is led out from the vacuum sealing flange plate of the vacuum induction furnace to the outside of the vacuum space of the vacuum induction furnace.

[0019] In addition, a preferred solution is that the power connector of each independent electric heating mechanism arranged on the outer side wall of the crucible is led out to the outside of the vacuum space of the vacuum induction furnace, including:

[0020] Connect the connector of each independent electric heating mechanism to one end of a water-cooling cable, and use the other end of the water-cooling cable as a power connector;

[0021] Lead the power connector from the vacuum sealing flange plate of the vacuum induction furnace to the outside of the vacuum space of the vacuum induction furnace.

[0022] In addition, a preferred solution is that in the process of providing a corresponding control power supply cabinet corresponding to each of the independent electric heating mechanisms,

[0023] Each of the independent electric heating mechanisms corresponds to a corresponding control power supply cabinet;

[0024] The control power supply cabinet includes a cabinet body and a transformer, a rectifier, and an inverter arranged inside the cabinet body; wherein the transformer is connected to the transmission line, the rectifier is connected to the transformer, a switch is arranged between the rectifier and the transformer, the inverter is connected to the rectifier, and an output terminal is connected to the output side of the inverter.

[0025] The present invention provides a heating method for a vacuum induction furnace, which adopts the vacuum induction furnace power configuration method as described above to configure the heating power supply for the heating position of the vacuum induction furnace, and based on the preset heating process requirements, independently controls the corresponding independent electric heating mechanism through the control power cabinet until the heating process of the vacuum induction furnace is completed.

[0026] It can be seen from the above technical scheme that the power supply configuration method and heating method of the vacuum induction furnace provided by the present invention are arranged and sleeved in the vertical direction on the outer wall of the crucible of the vacuum induction furnace, and a corresponding independent control power supply cabinet is set outside the vacuum induction furnace corresponding to each independent electric heating mechanism. The power connector of the independent electric heating mechanism is connected to the outlet terminal of the corresponding control power supply cabinet, thereby forming a total power supply together, which can meet the demand for high-power power supply of the vacuum induction furnace, and effectively solve the problem of vacuum corona discharge caused by excessive power supply voltage in the prior art; it can meet the technical requirements of current limiting of the copper tube of the induction coil; and the independent electric heating mechanism can be hoisted out of the vacuum induction furnace respectively during installation and removal, which is convenient for installation, disassembly and maintenance; according to the requirements of the heating process, the corresponding independent electric heating mechanism can be independently controlled by the control power supply cabinet, thereby optimizing the heating process.

[0027] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By referring to the following description in conjunction with the accompanying drawings, and with a more complete understanding of the present invention, other objects and results of the present invention will become more apparent and easily understood.

[0029] Figure 1 is a flow chart of a method for configuring a power supply for a vacuum induction furnace according to an embodiment of the present invention;

[0030] Figure 2Schematic diagram of the structure of a vacuum induction furnace heating power supply according to an embodiment of the present invention;

[0031] Figure 3 is a schematic structural diagram of a heating power supply for a vacuum induction furnace according to another embodiment of the present invention;

[0032] Figure 4 4 is a schematic diagram of a power supply configuration of a vacuum induction furnace according to an embodiment of the present invention.

[0033] In the attached drawings, 1-independent electric heating mechanism, 2-control power supply cabinet, 21-transformer, 22-rectifier, 23-inverter, 24-switch, 31-crucible, 32-vacuum space, 33-vacuum tank, 34-vacuum system, 35-feeding channel, 4-water cooling cable, 5-transmission line.

[0034] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0035] In the following description, for the purpose of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. However, it is apparent that these embodiments may also be implemented without these specific details.

[0036] In view of the problem that in the above-mentioned prior art, in the actual application of the vacuum induction furnace, the existing thyristor or IGBT power supply cannot meet the high power requirement when a single furnace needs higher power, a vacuum induction furnace power supply configuration method and a heating method are proposed.

[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] In order to illustrate the power supply configuration method and heating method of the vacuum induction furnace provided by the present invention, Figure 1 The flow chart of the power supply configuration method of a vacuum induction furnace according to an embodiment of the present invention is shown; Figure 2 The structure of a vacuum induction furnace heating power supply according to an embodiment of the present invention is shown; Figure 3 The structure of a vacuum induction furnace heating power supply according to another embodiment of the present invention is shown; Figure 4 The principle of the power supply configuration of a vacuum induction furnace according to an embodiment of the present invention is shown.

[0039] like Figures 1 to 4 As shown together, the vacuum induction furnace power supply configuration method provided by the present invention comprises the following steps:

[0040] Step S1, on the outer wall of the crucible 3 of the vacuum induction furnace, at least two independent electric heating mechanisms 1 are arranged in a vertical direction;

[0041] Step S2, leading the power connector of each independent electric heating mechanism 1 arranged on the outer wall of the crucible 31 to the outside of the vacuum space 32 of the vacuum induction furnace, and setting a corresponding control power cabinet 2 outside the vacuum induction furnace corresponding to each independent electric heating mechanism 1;

[0042] Step S3, connecting the power connector of each independent electric heating mechanism 1 to the outlet terminal of the corresponding control power cabinet 2 to complete the power configuration of the vacuum induction furnace.

[0043] It should be noted that the main structure of the vacuum induction furnace in the present invention is a mature structure in the prior art, which includes a vacuum tank 33, and a vacuum connection hole is opened on the vacuum tank 33 to connect with the vacuum system 34, so that a vacuum space 32 is formed inside the vacuum tank 33. A crucible 31 is arranged in the vacuum space 32, and an electric heating mechanism is arranged outside the crucible 31 to enable the crucible 31 to have a heating function. In the prior art, the crucible 31 is generally heated by connecting a whole heating power supply (thyristor or IGBT power supply) outside the crucible 31. Due to the limitation of vacuum voltage, the large-scale vacuum power supply is limited. For the situation where a single furnace needs more power, the thyristor or IGBT power supply in the prior art cannot meet the high power requirements. Therefore, the present invention forms a large vacuum power supply by applying several mature and safe separate power supplies (independent electric heating mechanisms) to a crucible 31 to meet the needs of industrial applications. A vertical feeding channel 35 is provided on the inner side wall of the heating crucible 31 for adding raw materials to the inside of the crucible 31 from the outside.

[0044] At least two independent electric heating mechanisms 1 are arranged and sleeved in the vertical direction on the outer side wall of the crucible 31 of the vacuum induction furnace, and a corresponding independent control power supply cabinet 2 is set outside the vacuum induction furnace corresponding to each independent electric heating mechanism 1. The power connector of the independent electric heating mechanism 1 is connected with the outlet terminal of the corresponding control power supply cabinet 2, so as to form a total power supply together, which can meet the demand for high-power power supply of the vacuum induction furnace and effectively solve the problem of vacuum corona discharge caused by excessive power supply voltage in the prior art; it can meet the technical requirements of current limiting of the copper tube of the induction coil; and the independent electric heating mechanism can be lifted out of the vacuum induction furnace respectively during installation and removal, which is convenient for installation, disassembly and maintenance; according to the requirements of the heating process, the corresponding independent electric heating mechanism can be independently controlled by the control power supply cabinet, so as to optimize the heating process.

[0045] As a preferred embodiment of the present invention, at least two independent electric heating mechanisms 1 are arranged in a vertical direction on the outer wall of the crucible 31 of the vacuum induction furnace, including:

[0046] According to the heating position area of ​​the crucible 31 and the preset vacuum voltage limit, a layout scheme of the independent electric heating mechanism 1 on the outer wall of the crucible 31 is designed; wherein the layout scheme includes the number of the independent electric heating mechanisms 1 and the position of each independent electric heating mechanism 1 on the outer wall of the crucible 31;

[0047] According to the layout scheme, the independent electric heating mechanisms 1 are arranged on the outer side wall of the crucible 31 in sequence from top to bottom.

[0048] Specifically, according to the heating position area of ​​the crucible 31 and the preset vacuum voltage limit (the specific value is determined according to the actual situation), the number of independent electric heating mechanisms 1 and the positions of different independent electric heating mechanisms 1 on the outer wall of the crucible 31 are determined, and then according to the layout plan, the independent electric heating mechanisms 1 are arranged on the outer wall of the crucible 31 in sequence from top to bottom at the heating position of the crucible 31.

[0049] As a preferred solution of the present invention, the independent electric heating mechanism 1 includes a single IGBT or at least two single IGBTs connected in parallel or at least two single IGBTs connected in series.

[0050] Specifically, the single IGBT in the present invention refers to an IGBT high-frequency induction heating module, and its single structure is a mature application in the prior art. In the present invention, a single IGBT can be used as an independent electric heating mechanism 1, or multiple single IGBTs can be connected in series or in parallel as an independent electric heating mechanism 1, and the present invention does not make any special limitation on this.

[0051] As a preferred solution of the present invention, the independent electric heating mechanism 1 includes a thyristor vacuum power induction coil or at least two thyristor vacuum power induction coils connected in parallel or at least two thyristor vacuum power induction coils connected in series.

[0052] Specifically, a single thyristor vacuum power induction coil is a mature application in the prior art. In the present invention, a thyristor vacuum power induction coil can be used as an independent electric heating mechanism 1, or multiple thyristor vacuum power induction coils can be connected in series or in parallel to serve as an independent electric heating mechanism 1, and the present invention does not make any special limitation on this.

[0053] It should be noted that: no matter the independent electric heating mechanism 1 is a single IGBT or a thyristor vacuum power induction coil, or a combination of a single IGBT and a thyristor vacuum power induction coil, for different independent electric heating mechanisms 1, the specific number of components, connection methods and power of the single IGBT or thyristor vacuum power induction coil can be different or the same, and the number of independent electric heating mechanisms 1 can be determined according to actual needs, and the present invention does not make any special restrictions on this. Figure 2 and Figure 3 As shown, in Figure 2In the embodiment, each independent electric heating mechanism 1 includes the same number of single IGBT or thyristor vacuum power supply induction coils. Figure 3 In the embodiment, the independent electric heating mechanism 1 includes different numbers of single IGBT or thyristor vacuum power supply induction coils.

[0054] As a preferred solution of the present invention, a magnetic yoke is arranged outside the thyristor vacuum power supply induction coil.

[0055] Specifically, a corresponding magnetic yoke may be installed outside the induction coil to prevent personal injury and reactive power loss caused by magnetic leakage of the induction coil.

[0056] As a preferred embodiment of the present invention, when the independent electric heating mechanism 1 includes at least two parallel thyristor vacuum power induction coils or at least two series thyristor vacuum power induction coils, the output impedance of each thyristor vacuum power induction coil to the corresponding control power cabinet is the same.

[0057] Specifically, the output impedances of each independent electric heating mechanism 1 to the corresponding induction coil are the same or similar, so that the independent electric heating mechanism 1 heats the crucible 31 evenly.

[0058] As a preferred solution of the present invention, the power connector of each independent electric heating mechanism 1 arranged on the outer wall of the crucible 31 is led out to the outside of the vacuum space 32 of the vacuum induction furnace, including:

[0059] The connector of each independent electric heating mechanism 1 is led out from the vacuum sealing flange plate of the vacuum induction furnace to the outside of the vacuum space 32 of the vacuum induction furnace as a power connector.

[0060] As a preferred solution of the present invention, the power connector of each independent electric heating mechanism 1 arranged on the outer wall of the crucible 31 is led out to the outside of the vacuum space 32 of the vacuum induction furnace, including:

[0061] Connect the connector of each independent electric heating mechanism 1 to one end of the water cooling cable 4, and use the other end of the water cooling cable 4 as a power connector;

[0062] Lead the power connector from the vacuum sealing flange plate of the vacuum induction furnace to the outside of the vacuum space 32 of the vacuum induction furnace.

[0063] Specifically, each independent electric heating mechanism 1 can be directly connected to the vacuum sealing flange plate on the wall of the vacuum tank 33 and led out of the vacuum tank 33 under the atmosphere, or connected to the vacuum sealing flange plate on the side wall of the vacuum tank 33 through a water-cooling cable 4 and led out of the vacuum tank 33 under the atmosphere. Both methods are acceptable and the present invention does not make any special limitations on this.

[0064] As a preferred solution of the present invention, in the process of providing a corresponding control power supply cabinet 2 corresponding to each independent electric heating mechanism 1,

[0065] Each independent electric heating mechanism 1 corresponds to a corresponding control power supply cabinet 2;

[0066] The control power supply cabinet 2 includes a cabinet body and a transformer 21, a rectifier 22, and an inverter 23 arranged inside the cabinet body; wherein the transformer 21 is connected to the transmission line 5, the rectifier 22 is connected to the transformer 21, a switch 24 is arranged between the rectifier 22 and the transformer 21, the inverter 23 is connected to the rectifier 22, and an output terminal is connected to the output side of the inverter 23.

[0067] Specifically, the above-mentioned control power cabinet 2 in the present invention is a power cabinet structure based on which each control power cabinet 2 can independently control the corresponding independent electric heating mechanism 1 .

[0068] The heating method of the vacuum induction furnace provided by the present invention adopts the vacuum induction furnace power supply configuration method of the present invention as described above to configure the heating power supply for the heating position of the vacuum induction furnace, and based on the preset heating process requirements, independently controls the corresponding independent electric heating mechanism 1 by controlling the power supply cabinet 2 until the heating process of the vacuum induction furnace is completed.

[0069] It can be seen from the above specific embodiments that the power supply configuration method and heating method of the vacuum induction furnace provided by the present invention are arranged and sleeved in the vertical direction on the outer wall of the crucible of the vacuum induction furnace, and a corresponding independent control power supply cabinet is provided on the outside of the vacuum induction furnace corresponding to each independent electric heating mechanism. The power connector of the independent electric heating mechanism is connected to the outlet terminal of the corresponding control power supply cabinet, thereby forming a total power supply together, which can meet the demand for high-power power supply of the vacuum induction furnace, and effectively solve the problem of vacuum corona discharge caused by excessive power supply voltage in the prior art; it can meet the technical requirements of current limiting of the copper tube of the induction coil; and the independent electric heating mechanism can be hoisted out of the vacuum induction furnace respectively during installation and removal, which is convenient for installation, disassembly and maintenance; according to the requirements of the heating process, the corresponding independent electric heating mechanism can be independently controlled by the control power supply cabinet, thereby optimizing the heating process.

[0070] As described above, the power configuration method and heating method of the vacuum induction furnace proposed in the present invention are described by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the power configuration method and heating method of the vacuum induction furnace proposed in the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A method for configuring a power supply of a vacuum induction furnace, characterized in that: The steps include: On the outer side wall of the crucible of the vacuum induction furnace, at least two independent electric heating mechanisms are arranged in a vertical direction; Leading the power connector of each independent electric heating mechanism arranged on the outer side wall of the crucible to the outside of the vacuum space of the vacuum induction furnace, and providing a corresponding control power cabinet corresponding to each independent electric heating mechanism outside the vacuum induction furnace; The power connector of each independent electric heating mechanism is connected to the outlet terminal of the corresponding control power cabinet to complete the power configuration of the vacuum induction furnace.

2. The method for configuring a power supply for a vacuum induction furnace according to claim 1, characterized in that: At least two independent electric heating mechanisms are arranged in a vertical direction on the outer side wall of the crucible of the vacuum induction furnace, including: According to the heating position area of ​​the crucible and the preset vacuum voltage limit, design a layout scheme of the independent electric heating mechanism on the outer side wall of the crucible; wherein the layout scheme includes the number of the independent electric heating mechanisms and the position of each independent electric heating mechanism on the outer side wall of the crucible; According to the layout scheme, the independent electric heating mechanisms are arranged on the outer side wall of the crucible in sequence from top to bottom.

3. The method for configuring a power supply for a vacuum induction furnace according to claim 1, characterized in that: The independent electric heating mechanism includes a single IGBT or at least two single IGBTs connected in parallel or at least two single IGBTs connected in series.

4. The method for configuring a power supply for a vacuum induction furnace according to claim 1, characterized in that: The independent electric heating mechanism includes a thyristor vacuum power induction coil or at least two thyristor vacuum power induction coils connected in parallel or at least two thyristor vacuum power induction coils connected in series.

5. The method for configuring a power supply for a vacuum induction furnace according to claim 4, characterized in that: A magnetic yoke is arranged outside the thyristor vacuum power supply induction coil.

6. The method for configuring a power supply for a vacuum induction furnace according to claim 4, characterized in that: When the independent electric heating mechanism includes at least two parallel-connected thyristor vacuum power induction coils or at least two series-connected thyristor vacuum power induction coils, the output impedance from each thyristor vacuum power induction coil to the corresponding control power cabinet is the same.

7. The method for configuring a power supply for a vacuum induction furnace according to claim 1, characterized in that: The method of leading the power connector of each independent electric heating mechanism arranged on the outer side wall of the crucible to the outside of the vacuum space of the vacuum induction furnace comprises: The connector of each independent electric heating mechanism is used as a power connector and is led out from the vacuum sealing flange plate of the vacuum induction furnace to the outside of the vacuum space of the vacuum induction furnace.

8. The method for configuring a power supply for a vacuum induction furnace according to claim 1, characterized in that: The method of leading the power connector of each independent electric heating mechanism arranged on the outer side wall of the crucible to the outside of the vacuum space of the vacuum induction furnace comprises: Connect the connector of each independent electric heating mechanism to one end of a water-cooling cable, and use the other end of the water-cooling cable as a power connector; Lead the power connector from the vacuum sealing flange plate of the vacuum induction furnace to the outside of the vacuum space of the vacuum induction furnace.

9. The method for configuring a power supply for a vacuum induction furnace according to claim 1, characterized in that: In the process of providing a corresponding control power supply cabinet corresponding to each of the independent electric heating mechanisms, Each of the independent electric heating mechanisms corresponds to a corresponding control power supply cabinet; The control power supply cabinet includes a cabinet body and a transformer, a rectifier, and an inverter arranged inside the cabinet body; wherein the transformer is connected to the transmission line, the rectifier is connected to the transformer, a switch is arranged between the rectifier and the transformer, the inverter is connected to the rectifier, and an output terminal is connected to the output side of the inverter.

10. A method for heating a vacuum induction furnace, characterized in that: The heating power supply of the heating position of the vacuum induction furnace is configured by the vacuum induction furnace power supply configuration method as described in any one of claims 1 to 9, and based on the preset heating process requirements, the corresponding independent electric heating mechanism is independently controlled by the control power supply cabinet until the heating process of the vacuum induction furnace is completed.

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