Superconducting induction heating system for metal bar blank

Abstract

A superconductive induction heating system for a metal bar blank is characterized in that a variable-frequency power supply is connected with a capacitor bank and a superconductive induction coil, the superconductive induction coil is located in a liquid nitrogen cooling cavity, the liquid nitrogen cooling cavity wraps a bar heating furnace cavity, and the bar heating furnace cavity and the liquid nitrogen cooling cavity are isolated by a refractory material and a thermal insulation material; during working, metal bars or blanks are pushed into the heating furnace cavity through the pushing mechanism, one or more metal bars or blanks can be pushed into the heating furnace cavity at a time according to different sizes of the bars, and after heating is completed, a heated bar is pushed out through the pushing mechanism. As the superconductive inductor has zero resistance value, the inductor has no heating loss in the heating process, while a large amount of heat is taken away and extra electric energy is consumed due to the fact that water cooling is needed for heating of the inductor in traditional induction heating. Compared with traditional induction heating, the superconducting induction heating can save electricity by 40-50%. And the basic national policy of energy conservation and emission reduction is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal hot working, and relates to induction heating before hot working such as forging and extrusion of metal rods or metal billets, and particularly relates to a superconducting induction heating system for metal rod billets. Background Art

[0002] Currently, the equipment used for heating metal rods or metal billets before forging and extrusion is mainly an induction heating furnace. In the existing induction heating furnace, the induction coil is made of copper tubes. Since the current generates heat when passing through the copper tubes during the working process, cooling water needs to be introduced into the copper tubes for cooling. Due to the large amount of heat generated, a large amount of electric energy is converted into heat of the inductor and wasted during the operation of the equipment. Summary of the Invention

[0003] In order to overcome the above deficiencies of the prior art, the purpose of the utility model is to provide a superconducting induction heating system for metal rod billets. The induction coil is made of superconducting materials. Since the superconducting inductor has a zero resistance value during the heating process, there is no heat loss in the inductor. In traditional induction heating, water cooling is required due to heat generation, which takes away a large amount of heat and consumes additional electric energy. Superconducting induction heating can save 40 - 50% of electricity compared with traditional induction heating.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A superconducting induction heating system for metal rod billets includes a frequency conversion power supply (1), characterized in that the frequency conversion power supply (1) is connected to a capacitor bank (8) and a superconducting induction coil (2). The superconducting induction coil (2) is located in a liquid nitrogen cooling chamber (5), and the liquid nitrogen cooling chamber (5) is wrapped outside a billet heating furnace chamber (3). The billet heating furnace chamber (3) and the liquid nitrogen cooling chamber (5) are isolated by refractory materials and heat insulation materials (4).

[0006] The billet heating furnace chamber (3) and the liquid nitrogen cooling chamber (5) are isolated by refractory materials and heat insulation materials (4) to isolate the superconducting induction coil (2) from the billet heating furnace chamber (3).

[0007] The liquid nitrogen cooling chamber (5) is designed with one or more liquid nitrogen cooling chambers according to the length of the superconducting inductor. Each chamber is connected to a liquid nitrogen replenishment and circulation device (6) through a pipeline (7) to meet the low-temperature operation working state of the superconducting inductor.

[0008] The superconducting induction coil (2) is made of superconducting materials, located in the liquid nitrogen cooling chamber (5), and is cooled by liquid nitrogen to maintain a superconducting working state of - 196°C.

[0009] The frequency conversion power supply (1) includes a power supply with power frequency, intermediate frequency, super audio frequency or high frequency.

[0010] The beneficial effects of the present utility model are as follows:

[0011] When heating a metal rod blank or a metal billet, since the induction coil of this structure uses superconducting material, compared with the induction coil made of copper material in traditional induction heating equipment, due to the superconducting material having no resistance or extremely low resistance, the ineffective energy consumption caused by the resistance of the traditional induction coil when passing alternating current is avoided, and all the alternating current electrical energy is converted into alternating magnetic field energy and absorbed by the metal material. More than 40 - 50% of the electrical energy is saved.

[0012] If this structure is applied to the metal material processing industry, the metal materials forged or extruded into shape after being heated by this patented product will be applied to multiple fields such as aerospace, transportation, oil pipelines, and power facilities, with huge economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the present invention.

[0014] Among them, 1 is a variable frequency power supply, 2 is a superconducting induction coil, 3 is a rod blank heating furnace cavity, 4 is refractory material and heat insulation material, 5 is a liquid nitrogen cooling chamber, 6 is a liquid nitrogen replenishment and circulation device, and 7 is a pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following further describes the present utility model in conjunction with the drawings.

[0016] As Figure 1 shown, a superconducting induction heating system for metal rod blanks includes a variable frequency power supply (1), and is characterized in that the variable frequency power supply (1) is connected to a capacitor bank (8) and a superconducting induction coil (2), the superconducting induction coil (2) is located in a liquid nitrogen cooling chamber (5), the liquid nitrogen cooling chamber (5) is wrapped outside the rod blank heating furnace cavity (3), and the rod blank heating furnace cavity (3) and the liquid nitrogen cooling chamber (5) are isolated by refractory material and heat insulation material (4).

[0017] Between the rod blank heating furnace cavity (3) and the liquid nitrogen cooling chamber (5), the superconducting induction coil (2) and the rod blank heating furnace cavity (3) are isolated by refractory material and heat insulation material (4).

[0018] According to the length of the superconducting inductor, one or more liquid nitrogen cooling chambers are designed for the liquid nitrogen cooling chamber (5), and each chamber is connected to a liquid nitrogen replenishment and circulation device (6) through a pipeline (7) to meet the low - temperature operation working state of the superconducting inductor.

[0019] The superconducting induction coil (2) is made of superconducting material, located in the liquid nitrogen cooling chamber (5), and is cooled by liquid nitrogen to maintain a superconducting working state of - 196°C.

[0020] The variable frequency power supply (1) includes a power supply with power frequency, intermediate frequency, super audio frequency or high frequency.

[0021] The working principle of the present utility model is as follows:

[0022] An induction coil made of superconducting material is installed in a sealed liquid nitrogen cooling chamber. The liquid nitrogen cooling circulation equipment ensures that it works in the superconducting state at -196°C. The variable frequency power supply supplies power to the capacitor bank and the superconducting induction coil, causing the induction coil to generate an alternating magnetic field. The metal material in the induction coil is in the alternating magnetic field and generates eddy currents due to induction, thereby generating heat to achieve the heating purpose.

[0023] During operation, the metal bar stock or blank is pushed into the heating furnace cavity by the propulsion mechanism. Depending on the size of the bar stock, one or more can be pushed in at a time. After heating is completed, the heated bar stock is pushed out by the propulsion mechanism. Since the superconducting inductor has a zero resistance value, there is no heat loss in the inductor during the heating process, while traditional induction heating requires water cooling due to heat generation, thus taking away a large amount of heat and consuming additional electrical energy. Superconducting induction heating can save 40 - 50% of electricity compared to traditional induction heating. It conforms to the basic national policy of energy conservation and emission reduction.

Claims

1. A superconducting induction heating system for a metal rod blank, comprising a variable frequency power supply (1), characterized in that: The variable frequency power supply (1) is connected to the capacitor group (8) and the superconducting induction coil (2). The superconducting induction coil (2) is located in a liquid nitrogen cooling chamber (5). The liquid nitrogen cooling chamber (5) is wrapped outside the rod heating furnace chamber (3). The rod heating furnace chamber (3) and the liquid nitrogen cooling chamber (5) are isolated by refractory materials and thermal insulation materials (4).

2. A metal rod blank superconducting induction heating system according to claim 1, characterized in that: The superconducting induction coil (2) is isolated from the rod heating furnace chamber (3) by refractory materials and heat-insulating materials (4) between the rod heating furnace chamber (3) and the liquid nitrogen cooling chamber (5).

3. A metal rod blank superconducting induction heating system according to claim 1, characterized in that: The liquid nitrogen cooling chamber (5) is designed to have one or more liquid nitrogen cooling chambers according to the length of the superconducting inductor, and each chamber is connected to the liquid nitrogen replenishment circulation device (6) via a pipeline (7) to meet the low-temperature operation working state of the superconducting inductor.

4. A metal rod blank superconducting induction heating system according to claim 1, characterized in that: The superconducting induction coil (2) is made of superconducting material, installed in a liquid nitrogen cooling chamber (5), and cooled by liquid nitrogen to maintain a superconducting working state of -196°C.

5. The metal rod blank superconducting induction heating system according to claim 1, characterized in that: The variable frequency power supply (1) includes industrial frequency, medium frequency, super-audio frequency or high frequency power supply.

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