Power supply system of vacuum heating furnace

Abstract

The invention relates to the field of vacuum heating furnaces, in particular to a power supply system of a vacuum heating furnace, which comprises an electrode assembly and a cooling assembly, the electrode assembly comprises a graphite electrode and a copper electrode, the graphite electrode is positioned in the vacuum heating furnace and connected to a heating body, one end of the copper electrode is connected with the graphite electrode, and the other end is connected with an external power supply; a cooling assembly is arranged on the copper electrode for cooling; a series connection mode that the graphite electrode is connected to the heating body, the copper electrode is connected to the graphite electrode and the external power supply is adopted, the whole graphite electrode is in an oxygen-free vacuum environment, so that the graphite electrode can bear the high temperature of the heating body, the copper electrode is in a relatively low-temperature environment, and the copper electrode is cooled through the cooling assembly; and good mechanical properties and conductivity can be maintained, so that the graphite electrode and the copper electrode can be well protected.

Description

Technical Field

[0001] The invention relates to the field of vacuum heating furnaces, and in particular to a power supply system of a vacuum heating furnace. Background Art

[0002] A vacuum heating furnace is a device that generates heat through a heating element and heats the product inside it. The heating element needs to be connected to an external power source through an electrode, and the electrode is directly connected to the heating element, causing the electrode to be in a high-temperature state at all times. Existing electrode materials have good heat resistance in the vacuum environment of the furnace, but the electrode must be extended out of the vacuum furnace to connect to an external power source. The part of the electrode exposed to the air is extremely susceptible to oxidation under high temperature conditions. Some existing technologies are equipped with a cooling system on the electrode, but the overall effect is not ideal. In actual use, the electrode still needs to be frequently replaced.

[0003] Therefore, it is necessary to propose an electrode power supply system with greater stability and durability. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a power supply system for a vacuum heating furnace, comprising:

[0005] An electrode assembly, comprising a graphite electrode and a copper electrode, for supplying power to a heating element in the vacuum heating furnace, wherein the graphite electrode is located in the vacuum heating furnace and connected to the heating element, one end of the copper electrode is located in the vacuum heating furnace and connected to the graphite electrode, and the other end is located outside the vacuum heating furnace and used to connect to a power source, and the copper electrode is sealed and connected to the vacuum heating furnace;

[0006] A cooling component is arranged on the copper electrode and is used for cooling the copper electrode.

[0007] Preferably, the graphite electrode and the copper electrode are arranged sequentially along a first direction, a cooling inner hole is provided on the end surface of the copper electrode away from the graphite electrode, the cooling assembly comprises an inlet pipe and an outlet pipe, the inlet pipe extends into the cooling inner hole for introducing a heat exchange medium into the cooling inner hole, and the outlet pipe is installed at the orifice end of the cooling inner hole for exporting the heat exchange medium in the cooling inner hole.

[0008] Preferably, the copper electrode is a columnar electrode extending along the first direction, the cooling inner hole is a circular hole opened on the circular end surface of the copper electrode away from the graphite electrode and coaxial with the copper electrode, and the inlet pipe is coaxially arranged with the cooling inner hole and the copper electrode.

[0009] Preferably, the cooling assembly further comprises a positioning member, wherein the positioning member is fixedly mounted on an end of the copper electrode away from the graphite electrode, and an inlet hole and an outlet hole are formed on the positioning member, which are used to mount the inlet pipe and the outlet pipe respectively.

[0010] Preferably, when the power supply system is assembled on the vacuum heating furnace, the first direction is parallel to a horizontal plane, and the outlet hole and the outlet pipe are oriented vertically upward.

[0011] Preferably, the outlet pipe is connected to a circulating water pump.

[0012] Preferably, it further comprises a sealing installation part, the outer end of the sealing installation part is sealingly installed with the vacuum heating furnace, the inner end of the sealing installation part is sealingly installed with the copper electrode, and the sealing installation part is made of insulating and heat-insulating materials.

[0013] Preferably, the sealing installation part is a double-layer sleeve structure, wherein the outer sleeve is connected to the vacuum heating furnace, and the inner sleeve is connected to the copper electrode.

[0014] Preferably, a retaining member that fits the outer contour of the copper electrode is provided on the copper electrode.

[0015] Preferably, a plurality of groups of electrode assemblies are spaced apart on the heating element, and each group of electrode assemblies is equipped with the cooling assembly.

[0016] Applying the technical solution provided by the present invention, the power supply system includes an electrode assembly and a cooling assembly, the electrode assembly includes a graphite electrode and a copper electrode, the graphite electrode is located in a vacuum heating furnace and connected to a heating element, one end of the copper electrode is connected to the graphite electrode, and the other end is connected to an external power supply, the copper electrode and the vacuum heating furnace are sealed, and a cooling assembly is arranged on the copper electrode for cooling; the graphite electrode is connected to the heating element, and the copper electrode is connected to the graphite electrode and the external power supply in series, the graphite electrode as a whole is in an oxygen-free vacuum environment, so that it can withstand the high temperature of the heating element, and the copper electrode is in a relatively low temperature environment, and the copper electrode is cooled by the cooling assembly, so that good mechanical properties and conductivity can be maintained, so that both the graphite electrode and the copper electrode can be well protected, thereby improving the stability and heat resistance of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a power supply system of a vacuum heating furnace provided in one embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the overall structure of a power supply system of a vacuum heating furnace provided in one embodiment of the present invention;

[0019] Among them, 1. vacuum heating furnace; 2. electrode assembly; 21. graphite electrode; 22. copper electrode; 221. cooling inner hole; 3. cooling assembly; 31. inlet pipe; 32. outlet pipe; 33. positioning piece; 4. sealing installation part. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Figure 1 It is a structural schematic diagram of a power supply system of a vacuum heating furnace provided in one embodiment of the present invention.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a power supply system for a vacuum heating furnace, including an electrode assembly 2 and a cooling assembly 3. The electrode assembly 2 includes a graphite electrode 21 and a copper electrode 22. The graphite electrode 21 is located inside the vacuum heating furnace 1. One end of the graphite electrode 21 is connected to a heating element (not shown) of the vacuum heating furnace 1. The specific connection method between the electrode and the heating element can be based on the existing technology, which will not be described in detail here. The other end of the graphite electrode 21 is connected to the end of the copper electrode 22 located inside the vacuum heating furnace 1. The other end of the copper electrode 22 is located outside the vacuum heating furnace 1 for connection. An external power supply is provided, and the copper electrode 22 is sealedly connected to the vacuum heating furnace 1. The graphite electrode 21 is connected to the heating element, and the copper electrode 22 is connected to the graphite electrode 21 and the external power supply in series. The graphite electrode 21 is placed in an oxygen-free vacuum environment as a whole. The graphite electrode 21 has the ability to withstand the high temperature of the heating element in a vacuum environment, and the copper electrode 22 is placed in a relatively low temperature environment to avoid the copper electrode 22 directly contacting the high-temperature heating element to cause softening or even melting. The copper electrode is cooled by the cooling component 3 so that it can maintain good mechanical properties and conductivity.

[0023] like Figure 1 As shown, in one preferred embodiment, the graphite electrode 21 and the copper electrode 22 are arranged in sequence along the first direction. Figure 1The first direction is the left direction. A cooling inner hole 221 is provided on the end face of the copper electrode 22 away from the graphite electrode 21. The cooling assembly 3 includes an inlet pipe 31 and an outlet pipe 32. The inlet pipe 31 extends into the cooling inner hole 221 for introducing a cooling medium into the cooling inner hole 221. The outlet pipe 32 is installed at the orifice end of the cooling inner hole 221 for guiding out the cooling medium in the cooling inner hole 221. In addition, other methods may be used to cool the copper electrode 22, for example, winding a cooling pipeline on the copper electrode 22.

[0024] The heating element may be a graphite heating element or a resistance coil, etc., as long as it can generate heat after current is passed through it, which will not be elaborated here.

[0025] In one preferred embodiment, the copper electrode 22 is a columnar electrode extending along the first direction, the cooling inner hole 221 is coaxial with the copper electrode 22, and the inlet pipe 31 is coaxial with the cooling inner hole 221. Figure 1 As shown, after the cooling medium enters the cooling inner hole 221 from the inlet pipe 31, it flows in the cooling inner hole 221, and is led out from the outlet pipe 32 of the orifice after flowing to the orifice, so that all parts of the copper electrode 22 can be fully and evenly cooled, thereby improving the cooling effect;

[0026] In addition, if Figure 1 As shown, the depth of the cooling inner hole 221 should be increased as much as possible under the premise of ensuring the stability of the copper electrode 22, so that as many parts of the copper electrode 22 as possible are in direct contact with the cooling medium for heat exchange, thereby improving the cooling effect on the copper electrode 22; the inlet pipe 31 can be made of a material with better thermal conductivity. When the cooling medium enters the bottom of the cooling inner hole 221, it is in direct contact with the copper electrode 22 and becomes a cooling medium with a higher temperature. When the higher temperature cooling medium flows to the orifice of the cooling inner hole 221 and the outlet pipe 32 under the action of pressure, the cooling effect on the copper electrode 22 is limited. By setting the inlet pipe 31 to have better thermal conductivity, the cooling medium with a lower temperature in the inlet pipe 31 can cool the above-mentioned cooling medium with a higher temperature to a certain extent, thereby making the cooling medium have a better cooling effect on the copper electrode 22 as a whole, and in disguised form improves the heat exchange time between the cooling medium and the copper electrode 22, so that the same unit of cooling medium has a better cooling effect on the copper electrode 22.

[0027] like Figure 1 As shown, in one preferred embodiment, the cooling assembly further includes a positioning member 33, which is fixedly mounted on one end of the copper electrode 22 away from the graphite electrode 21, and is used to position and install the inlet pipe 31 and the outlet pipe 32.

[0028] like Figure 1As shown, in one preferred embodiment, when the power supply system is assembled on the vacuum heating furnace 1, the first direction is parallel to the horizontal plane, and the outlet hole and the outlet pipe 32 are oriented vertically upward, that is, Figure 1 In the structure shown in , when the cooling medium enters the copper electrode 22, some cooling media with a lower boiling point, such as water, will inevitably boil and vaporize, and the density of water vapor is much smaller than the density of water, and the volume is much larger than the volume of water. Therefore, by setting the outlet pipe 32 to face upward, when water vapor is generated in the cooling inner hole 221, the water vapor is discharged upward from the outlet pipe 32, so that the unvaporized low-temperature water can be smoothly filled in the cooling inner hole 221 without being hindered by the water vapor, thereby improving the cooling effect on the copper electrode 22.

[0029] Furthermore, a circulating water pump can be connected to the output port of the outlet pipe 32 to quickly extract the water vapor and the higher temperature cooling water in the cooling inner hole 221 and the outlet pipe 32, so that the low temperature water in the inlet pipe 31 can smoothly enter the cooling inner hole 221.

[0030] like Figure 1 As shown, in one of the preferred embodiments, a sealing installation part 4 is provided between the copper electrode 22 and the vacuum heating furnace 1, the outer end of the sealing installation part 4 is sealed and connected to the vacuum heating furnace 1, and the inner end is sealed and connected to the copper electrode 22, and the sealing installation part 4 is made of insulating and heat-insulating material. On the one hand, the current on the copper electrode 22 will not be conducted to the furnace wall of the vacuum heating furnace 1, and on the other hand, the sealing installation part 4 will not conduct the high temperature on the furnace wall of the vacuum heating furnace 1 to the copper electrode 22, which can play a good protective role for the copper electrode 22.

[0031] Furthermore, the sealing installation part 4 can adopt a double-layer sleeve structure, wherein the outer sleeve is connected to the vacuum heating furnace 1 and the inner sleeve is connected to the copper electrode 22 , thereby further isolating the copper electrode 22 from the high-temperature furnace wall of the vacuum heating furnace 1 and improving the protection effect on the copper electrode 22 .

[0032] In addition, Figure 1 In the embodiment shown, the sealing installation part 4 has an outer sleeve, an inner sleeve and a sealing flange at the end of the sleeve (i.e., the structure at the left end of the sealing installation part 4). The sealing flange is used to seal and connect the copper electrode 22. The sealing flange is also made of insulating and heat-insulating materials to ensure the overall sealing of the vacuum heating furnace and to ensure that it can smoothly form a vacuum environment. In another embodiment, the sealing flange at the end of the sleeve can be arranged on one side of the sleeve inside the vacuum heating furnace 1. Figure 1 The center is the right side of the sleeve, and the inner side of the sealing flange is sealed and connected to the graphite electrode 21. In this way, the copper electrode 22 can be separated from the inside of the vacuum heating furnace 1 as a whole, further improving the protection effect of the copper electrode 22.

[0033] In one of the preferred embodiments, a retaining member that fits the outer contour of the copper electrode 22 is provided on the copper electrode 22. The retaining member should have stronger heat resistance than the copper electrode 22. When the copper electrode 22 tends to soften and deform due to heat, the retaining member can well maintain the shape of the copper electrode 22, and the retaining member can be made of a material with good thermal conductivity, such as iron, steel or other alloys. An additional cooling water circulation system is provided on the retaining member so that the heat on the copper electrode 22 can be discharged by the retaining member; in addition, the retaining member can also be provided to wrap the outside of the copper electrode 22 as a whole, so that a vacuum environment with a low oxygen concentration is formed between the inner wall of the retaining member and the copper electrode 22, which can prevent the copper electrode 22 from being directly in contact with the outside air over a large area and causing oxidation.

[0034] Figure 2 It is a schematic diagram of the overall structure of a power supply system of a vacuum heating furnace provided in one embodiment of the present invention.

[0035] like Figure 2 As shown, in one of the preferred embodiments, multiple groups of electrode assemblies 2 are arranged at intervals on the heating element, and each group of electrode assemblies 2 is equipped with a cooling assembly 3. By arranging multiple groups of electrode assemblies 2, the current distribution on the heating element can be made more uniform, thereby improving the heating effect of the product inside it.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A power supply system for a vacuum heating furnace, characterized in that: include: An electrode assembly, comprising a graphite electrode and a copper electrode, for supplying power to a heating element in the vacuum heating furnace, wherein the graphite electrode is located in the vacuum heating furnace and connected to the heating element, one end of the copper electrode is located in the vacuum heating furnace and connected to the graphite electrode, and the other end is located outside the vacuum heating furnace and used to connect to a power source, and the copper electrode is sealed and connected to the vacuum heating furnace; A cooling component is arranged on the copper electrode and is used for cooling the copper electrode.

2. The power supply system according to claim 1, characterized in that: The graphite electrode and the copper electrode are arranged in sequence along a first direction. A cooling inner hole is provided on the end surface of the copper electrode away from the graphite electrode. The cooling assembly includes an inlet pipe and an outlet pipe. The inlet pipe extends into the cooling inner hole for introducing a heat exchange medium into the cooling inner hole. The outlet pipe is installed at the orifice end of the cooling inner hole for exporting the heat exchange medium in the cooling inner hole.

3. The power supply system according to claim 2, characterized in that: The copper electrode is a columnar electrode extending along the first direction, the cooling inner hole is a circular hole opened on the circular end surface of the copper electrode away from the graphite electrode and coaxial with the copper electrode, and the inlet pipe is coaxially arranged with the cooling inner hole and the copper electrode.

4. The power supply system according to claim 3, characterized in that: The cooling assembly also includes a positioning member, which is fixedly installed at one end of the copper electrode away from the graphite electrode. The positioning member is provided with an inlet hole and an outlet hole, which are used to install the inlet pipe and the outlet pipe respectively.

5. The power supply system according to claim 4, characterized in that: When the power supply system is assembled on the vacuum heating furnace, the first direction is parallel to a horizontal plane, and the outlet hole and the outlet pipe are oriented vertically upward.

6. The power supply system according to claim 2, characterized in that: The outlet pipe is connected with a circulating water pump.

7. The power supply system according to claim 1, characterized in that: It also includes a sealing installation part, the outer end of the sealing installation part is sealed and connected to the vacuum heating furnace, the inner end of the sealing installation part is sealed and installed with the copper electrode, and the sealing connection part is made of insulating and heat-insulating materials.

8. The power supply system according to claim 7, characterized in that: The sealing installation part is a double-layer sleeve structure, wherein the outer sleeve is connected to the vacuum heating furnace, and the inner sleeve is connected to the copper electrode.

9. The power supply system according to claim 1, characterized in that: The copper electrode is provided with a retaining piece which fits the outer contour of the copper electrode.

10. The power supply system according to claim 1, characterized in that: The electrode assemblies are arranged in a plurality of groups at intervals on the heating element, and each group of the electrode assemblies is equipped with the cooling assembly.

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