A furnace cover and induction furnace thereof

Abstract

The application discloses a furnace cover and an induction electric furnace thereof, and relates to the field of induction electric furnaces. The furnace cover comprises a furnace cover steel component, the furnace cover steel component is filled with a casting body, and an inner magnetic yoke is arranged in the casting body. The induction electric furnace comprises the furnace cover and further comprises a furnace lining arranged in the induction electric furnace, a magnetically conductive furnace charge is arranged in the furnace lining, an inductor is arranged outside the furnace lining, and an outer magnetic yoke is arranged outside the inductor. Under the cooperation of the inner magnetic yoke and the outer magnetic yoke, the magnetic field flowing to the furnace cover is not shielded but conducted back to the furnace, and acts on the magnetically conductive furnace charge in the furnace lining, so that the magnetic field loss is avoided, and the energy consumption is effectively reduced.

Description

Technical Field

[0001] This application relates to the field of induction furnaces, and in particular to a furnace cover and an induction furnace thereof. Background Technology

[0002] The furnace cover of the induction furnace is installed on top of the furnace, firmly covering and fixing it in place. The furnace cover consists of a steel structure and castable refractory. Traditional furnace covers have a short-circuit ring made of copper tubing embedded in the castable refractory. Its function is to shield the magnetic field generated by the induction generator, blocking the magnetic field below the short-circuit ring, preventing the magnetic field from spreading to the top of the furnace cover, avoiding overheating of the furnace cover's steel structure, and reducing energy loss caused by magnetic field diffusion.

[0003] Since the function of the short-circuit ring is to shield the magnetic field, it cannot conduct the magnetic field. When the magnetic field flows to the short-circuit ring, it is absorbed by the shield. This part of the magnetic field actually acts on the short-circuit ring, so the temperature rise of the short-circuit ring is very high, and water cooling is required.

[0004] The magnetic field generated by the induction furnace is used to cut the furnace charge inside the furnace lining, causing the charge to generate eddy currents and melt. Therefore, the magnetic field is shielded and absorbed by the short-circuit ring, and its action on the short-circuit ring is actually a waste of energy for the induction furnace. Utility Model Content

[0005] In order to improve the problem that although the short-circuit ring can prevent the furnace cover from heating up, the magnetic field absorbed by the short-circuit ring does not act on the furnace charge heating, resulting in some energy waste, this application provides an inner magnetic yoke type furnace cover for induction furnaces.

[0006] Firstly, the furnace cover provided in this application adopts the following technical solution:

[0007] A furnace cover includes a furnace cover steel component, the furnace cover steel component being filled with a casting body, and an inner magnetic yoke being disposed within the casting body.

[0008] By adopting the above technical solution, the short-circuit ring pre-embedded in the furnace cover is replaced with an inner magnetic yoke. Because the inner magnetic yoke has extremely high magnetic permeability, the magnetic field flowing to the furnace cover is not shielded. Instead, under the action of the inner magnetic yoke, the magnetic field is guided back into the furnace and acts on the magnetically conductive charge within the furnace lining, thus avoiding magnetic field loss and effectively reducing energy consumption.

[0009] Optionally, the inner magnetic yoke is provided in multiple ways, and the multiple inner magnetic yokes are evenly spaced around the circumference of the furnace cover steel component.

[0010] By adopting the above technical solution, multiple inner magnetic yokes are evenly spaced around the circumference of the furnace cover steel component, which can effectively guide and distribute the magnetic field generated by the induction furnace, so that the magnetic field acts more evenly on the magnetic charge in the furnace lining and improve the magnetic field utilization rate.

[0011] Secondly, the induction furnace provided in this application adopts the following technical solution:

[0012] An induction furnace includes a furnace cover and a furnace lining disposed inside the furnace. The furnace lining contains magnetically conductive furnace charge, and an inductor is disposed outside the furnace lining. An outer magnetic yoke is disposed outside the inductor.

[0013] By adopting the above technical solution, the configuration of the magnetic charge within the furnace lining allows the magnetic field to directly act on the charge. When the inductor is switched on with alternating current, it generates an alternating magnetic field in its surrounding space, which is the basis for heating in the induction furnace. The outer magnetic yoke outside the inductor enhances the control of the magnetic field, improving the working performance of the induction furnace. Simultaneously, the inner magnetic yoke within the furnace cover effectively guides the magnetic field, reducing heat generation in the furnace cover's steel structure and directing the magnetic field into the induction furnace to act on the magnetic charge, thus reducing energy loss.

[0014] Optionally, multiple outer magnetic yokes are provided, and the multiple outer magnetic yokes are evenly spaced around the circumference of the furnace lining.

[0015] By adopting the above technical solution, the uniformly distributed outer magnetic yoke can effectively constrain the magnetic field generated by the sensor, making the magnetic lines of force more concentrated in the furnace charge area inside the furnace lining, and reducing magnetic leakage.

[0016] Optionally, the number of outer magnetic yokes is the same as the number of inner magnetic yokes, and the outer magnetic yokes are arranged one-to-one above the inner magnetic yokes.

[0017] By adopting the above technical solution, the number of outer and inner magnetic yokes is consistent, and the outer magnetic yokes are positioned one-to-one above the inner magnetic yokes, allowing the magnetic field to form a more closed magnetic circuit. Simultaneously, because the magnetic field distribution is more uniform and concentrated, the problem of localized overheating or underheating of the magnetic flux furnace charge is effectively avoided.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. By setting an inner magnetic yoke inside the furnace cover, the magnetic field generated by the sensor can be fixed, preventing the magnetic field from spreading to the upper part of the furnace cover, thereby avoiding overheating of the furnace cover steel structure.

[0020] 2. The combined action of the inner and outer magnetic yokes ensures that the magnetic field flowing to the furnace cover is not shielded, but is instead conducted back into the furnace and acts on the magnetic charge inside the furnace lining, thus avoiding magnetic field loss and effectively reducing energy consumption. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a vertical sectional view of a furnace cover according to an embodiment of the present application, showing the furnace cover steel components, casting body and inner magnetic yoke;

[0023] Figure 2 This is a cross-sectional view in the horizontal direction of a furnace cover according to an embodiment of the present application, which shows the circumferential distribution of multiple inner magnetic yokes;

[0024] Figure 3 This is a cross-sectional view of an induction furnace provided in an embodiment of this application.

[0025] Reference numerals in the attached drawings: 1. Steel component of furnace cover; 2. Casting body; 3. Inner magnetic yoke; 4. Furnace lining; 5. Magnetic charge; 6. Inductor; 7. Outer magnetic yoke. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0027] In one aspect, embodiments of this application disclose a furnace cover.

[0028] Reference Figure 1 A furnace cover includes a furnace cover steel component 1, a casting body 2 is filled inside the furnace cover steel component 1, and a plurality of inner magnetic yokes 3 are provided inside the casting body 2.

[0029] Among them, the casting body 2 has low thermal conductivity, which effectively prevents the high temperature inside the furnace from being transferred to the furnace cover steel component 1, reducing heat loss. In addition, the casting body 2 can also work with the furnace cover steel component 1 to distribute stress and improve the stability of the furnace cover structure.

[0030] The inner magnetic yoke 3 can be made of silicon steel sheets or iron-nickel alloy with high magnetic permeability. Silicon steel sheets have the characteristics of high magnetic permeability and low loss, making them suitable for high-frequency magnetic field environments; iron-nickel alloys have good temperature stability and are suitable for high-temperature working conditions.

[0031] Reference Figure 2 Multiple inner magnetic yokes 3 are evenly spaced around the circumference of the furnace cover steel component 1. During the furnace cover manufacturing process, multiple inner magnetic yokes 3 are first fixed in a circular pattern inside the furnace cover steel component 1, and then the casting body 2 is filled into the furnace cover steel component 1. After the casting body 2 solidifies, the furnace cover is formed.

[0032] Multiple inner magnetic yokes 3 are evenly spaced around the circumference of the furnace cover steel component 1, which can effectively guide and distribute the magnetic field inside the furnace cover. Due to the ultra-high magnetic permeability of the inner magnetic yokes 3, the magnetic field flowing to the furnace cover is not shielded, but is guided back into the furnace under the action of the inner magnetic yokes 3, thereby effectively reducing energy consumption.

[0033] The implementation principle of a furnace cover according to an embodiment of this application is as follows: by setting an inner magnetic yoke 3 inside the furnace cover, the magnetic field is prevented from diffusing to the upper part of the furnace cover, thereby avoiding heating of the furnace cover steel structure. At the same time, under the action of the inner magnetic yoke 3, the magnetic field flowing to the furnace cover is not shielded, but is conducted back into the furnace, avoiding magnetic field loss and effectively reducing energy consumption.

[0034] Secondly, embodiments of this application disclose an induction furnace.

[0035] Reference Figure 3 An induction furnace includes the furnace cover described in the above embodiment, and also includes a furnace lining 4 disposed inside the induction furnace, a magnetic charge 5 disposed inside the furnace lining 4, an inductor 6 disposed outside the furnace lining 4, and a plurality of outer magnetic yokes 7 disposed outside the inductor 6.

[0036] Multiple outer magnetic yokes 7 are evenly spaced around the circumference of the furnace lining 4, which can effectively constrain the magnetic field generated by the inductor 6, making the magnetic lines of force more concentrated in the furnace charge area inside the furnace lining 4 and reducing magnetic leakage. In addition, the number of outer magnetic yokes 7 is the same as the number of inner magnetic yokes 3, and the outer magnetic yokes 7 are arranged one-to-one above the inner magnetic yokes 3, so that the magnetic field can form a more closed magnetic circuit.

[0037] The furnace lining 4 is made of refractory material with high thermal insulation properties, which greatly reduces the conduction of high temperature inside the furnace to the outside of the furnace body and reduces heat loss. The magnetic charge 5 has high magnetic permeability, which can make the magnetic field distribution inside the furnace more uniform, thereby allowing the charge to be heated uniformly under the action of induced current.

[0038] Reference Figure 3 By placing the outer magnetic yoke 7 outside the inductor 6, the magnetic field generated by the inductor 6 can be effectively guided and constrained, making it act more concentratedly on the furnace charge area inside the furnace lining 4. The outer magnetic yoke 7 can be made of silicon steel sheets with high magnetic permeability or iron-nickel alloy.

[0039] Reference Figure 3When the alternating magnetic field generated by sensor 6 diffuses towards the furnace cover, the inner magnetic yoke 3 guides the magnetic field upwards, and then the corresponding outer magnetic yoke 7 below guides the magnetic field back into the furnace. Unlike traditional short-circuit rings that shield the magnetic field, causing the magnetic energy to be absorbed and wasted, and requiring water cooling, the combined action of the inner magnetic yoke 3 and the outer magnetic yoke 7 ensures that the magnetic field flowing to the furnace cover is not shielded, but is instead conducted back into the furnace, acting on the magnetic charge 5 within the furnace lining 4. This avoids magnetic field loss and effectively reduces energy consumption. Simultaneously, it prevents the furnace cover steel component 1 from overheating due to the magnetic field, eliminating the need for a complex cooling system and improving the stability of equipment operation.

[0040] The implementation principle of an induction furnace according to an embodiment of this application is as follows: when the alternating magnetic field generated by the inductor 6 diffuses towards the furnace cover, the inner magnetic yoke 3 guides the magnetic field upward, and then the corresponding outer magnetic yoke 7 located below guides the magnetic field back into the furnace, acting on the magnetic charge 5, thereby reducing energy loss. This not only solves the energy waste problem caused by the traditional short-circuit ring, but also improves the overall efficiency and heating uniformity of the induction furnace.

[0041] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A furnace lid, characterized in that: It includes a furnace cover steel component (1), which is filled with a casting body (2), and an inner magnetic yoke (3) is provided inside the casting body (2).

2. A furnace cover according to claim 1, characterized in that: The inner magnetic yoke (3) is configured as a plurality of such yokes, which are evenly spaced around the circumference of the furnace cover steel component (1).

3. An induction furnace, comprising a furnace lid as described in any one of claims 1-2, characterized in that: It also includes a furnace lining (4) installed inside the induction furnace, a magnetic charge (5) is installed inside the furnace lining (4), an inductor (6) is installed outside the furnace lining (4), and an outer magnetic yoke (7) is installed outside the inductor (6).

4. An induction furnace according to claim 3, characterized in that: The outer magnetic yoke (7) is configured as a plurality of them, and the plurality of outer magnetic yokes (7) are evenly spaced around the circumference of the furnace lining (4).

5. An induction furnace according to claim 3, characterized in that: The number of the outer magnetic yokes (7) is the same as the number of the inner magnetic yokes (3), and the outer magnetic yokes (7) are arranged one-to-one above the inner magnetic yokes (3).

Images