CN212870727U - Intermediate frequency induction melting furnace capable of improving melting efficiency - Google Patents
Intermediate frequency induction melting furnace capable of improving melting efficiency Download PDFInfo
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- CN212870727U CN212870727U CN202021232270.2U CN202021232270U CN212870727U CN 212870727 U CN212870727 U CN 212870727U CN 202021232270 U CN202021232270 U CN 202021232270U CN 212870727 U CN212870727 U CN 212870727U
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Abstract
The utility model discloses a can improve medium frequency induction melting furnace of melting efficiency, including the melting furnace body, its characterized in that: the melting furnace body comprises a refractory furnace body, an insulating layer, an induction coil and a graphite cylinder; the coating in the fire-resistant furnace body outside has the insulating layer, and induction coil evenly twines the insulating layer outside on the fire-resistant furnace body, and outside intermediate frequency power is connected at induction coil's both ends, and graphite cylinder's outside laminating sets up on the inner wall of fire-resistant furnace body and lies in fire-resistant furnace body along the intermediate position of direction of height. The utility model provides a problem that high conductivity metal inefficiency such as the current intermediate frequency induction melting furnace in market melts aluminium, copper and the problem of aluminium liquid oxidation that hump high oxidation film cracked easily and lead to.
Description
Technical Field
The utility model belongs to the technical field of metal melting equipment, especially, relate to a can improve medium frequency induction melting furnace of melting efficiency.
Background
Aluminum and aluminum alloys, copper and copper alloys are widely applied to the fields of electricity, light industry, mechanical manufacturing, building industry, national defense industry and the like, and the melting and casting industry of copper alloys and aluminum alloys has been greatly developed in recent years.
In the equipment for melting aluminum or copper by using the coreless induction furnace, the heating efficiency is usually only 30 to 40 percent because the electrical conductivity of aluminum and copper is high and the relative magnetic conductivity is close to 1, and most electric energy is generated by a coil and is taken away by cooling water.
In the coreless induction aluminum melting furnace, an oxidation film is formed on the surface of the aluminum liquid, and the oxidation film can prevent the aluminum liquid from being further oxidized. However, due to the electromagnetic stirring characteristic of the induction furnace, bulges can be formed on the surface of the aluminum liquid in the smelting process, the oxide film can be broken and a new oxide film can be formed when the bulges are high, the repeated circulation can increase the oxidation loss of the aluminum liquid, and the components of the aluminum liquid are influenced.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the prior art with not enough, the utility model aims to provide a can improve the intermediate frequency induction melting furnace of melting efficiency, solved the problem that high conductivity metal inefficiency such as the prior art intermediate frequency induction melting furnace melts aluminium, copper and the problem of the aluminium liquid oxidation that leads to of hump high oxide film breaking easily.
The technical scheme of the utility model as follows: a medium-frequency induction melting furnace capable of improving melting efficiency comprises a melting furnace body, wherein the melting furnace body comprises a refractory furnace body, an insulating layer, an induction coil and a graphite cylinder;
the coating in the fire-resistant furnace body outside has the insulating layer, and induction coil evenly twines the insulating layer outside on the fire-resistant furnace body, and outside intermediate frequency power is connected at induction coil's both ends, and graphite cylinder's outside laminating sets up on the inner wall of fire-resistant furnace body and lies in fire-resistant furnace body along the intermediate position of direction of height.
Preferably, the height of the graphite cylinder is 30-80% of the height of the refractory furnace body.
Preferably, the distance from the bottom of the graphite cylinder to the bottom of the refractory furnace body is 0-50% of the height of the refractory furnace body, and the distance from the top of the graphite cylinder to the top of the refractory furnace body is 20-70% of the height of the refractory furnace body.
Preferably, the thickness of the induction coil ranges from 30mm to 50 mm.
Preferably, the refractory furnace body is formed by sintering a refractory ramming material.
Preferably, the insulating layer is made of insulating refractory mortar.
Preferably, the furnace further comprises a graphite crucible arranged in the refractory furnace body.
Compared with the prior art, the utility model has the advantages of:
(1) the utility model adds the graphite cylinder in the refractory furnace body, because the graphite has low conductivity, the efficiency of the induction heating graphite is about 20 percent higher than the efficiency of heating copper or aluminum, after the graphite cylinder is added, the graphite is efficiently heated and transfers heat to furnace liquid in the place covered by the graphite in the furnace chamber, the graphite is directly contacted with furnace charge, the heat is transferred to the furnace charge through heat conduction, and the furnace charge is indirectly heated;
(2) in the utility model, due to the shielding effect of the graphite cylinder on the magnetic field, the electromagnetic stirring force of the induction melting furnace can be reduced, the problems of too high hump and bulge breakage of molten aluminum are reduced, and the oxidation loss of the molten aluminum can be effectively reduced;
(3) in the utility model, the graphite cylinders are at a certain distance from the upper part and the lower part of the furnace body, the upper part of the furnace body is not covered by graphite, and the induction coil directly heats furnace burden and has the same working condition as the conventional induction heating principle; a small section of graphite-free cylinder is reserved at the bottom of the furnace body for covering, and the copper alloy or the aluminum alloy needs to be electromagnetically stirred in the melting process so as to ensure the uniformity of components of molten metal and the melting speed of refractory raw materials;
(4) the utility model discloses when centreless induction furnace heats, graphite drum itself is exactly a whole ring in alternating magnetic field, and the electric current of formation is stable, can avoid striking sparks to the impact and the noise problem of medium frequency power supply because of the furnace charge that the furnace charge contact is not good to produce.
Drawings
FIG. 1 is a schematic structural view of a medium frequency induction melting furnace of the present invention for improving melting efficiency;
description of reference numerals:
1-refractory furnace body, 2-insulating layer, 3-induction coil and 4-graphite cylinder.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings and examples:
it should be noted that the structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, and any modification of the structure, change of the ratio relationship or adjustment of the size should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the efficacy that the present invention can produce and the purpose that can be achieved.
Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
As shown in fig. 1, it shows a specific embodiment of the present invention: a medium frequency induction melting furnace capable of improving melting efficiency comprises a melting furnace body, wherein the melting furnace body comprises a refractory furnace body 1, an insulating layer 2, an induction coil 3 and a graphite cylinder 4;
the outer side of a fire-resistant furnace body 1 is coated with an insulating layer 2, an induction coil 3 is uniformly wound on the outer side of the insulating layer 2 on the fire-resistant furnace body 1, two ends of the induction coil 3 are connected with an external medium-frequency power supply, two ends of a spiral induction copper coil are connected with the medium-frequency power supply, the coil is generally wound by a copper pipe, and water is introduced into the coil for cooling; magnetic lines of force generated inside the magnetic field changing at high speed generate countless small eddy currents in the metal raw material, so that the metal raw material is heated rapidly until the metal raw material is melted.
The outer side of the graphite cylinder 4 is attached to the inner wall of the refractory furnace body 1 and is located at the middle position in the refractory furnace body 1 along the height direction. Because graphite has low conductivity, the efficiency of induction heating graphite is about 20% higher than that of heating copper or aluminum, after the graphite cylinder is added, the graphite is efficiently heated at the place covered by graphite in the hearth and transfers heat to furnace liquid, the graphite is directly contacted with furnace charge, heat is transferred to the furnace charge through heat conduction, and the furnace charge is indirectly heated.
Specifically, the height of the graphite cylinder 4 is 30-80% of the height of the refractory furnace body 1.
Specifically, the distance from the bottom of the graphite cylinder 4 to the bottom of the refractory furnace body is 0% -50% of the height of the refractory furnace body 1, and the distance from the top of the graphite cylinder 4 to the top of the refractory furnace body 1 is 20% -70% of the height of the refractory furnace body 1.
The induction coil 3 directly heats the furnace charge at the place without graphite cover on the upper part of the hearth, and the working condition is the same as that of the conventional induction heating principle; a small section of non-graphite cover is reserved at the bottom of the hearth, and electromagnetic stirring is mainly considered to be needed in the melting process of copper alloy or aluminum alloy, so that the uniformity of components of molten metal and the melting speed of refractory raw materials are guaranteed.
In the coreless induction aluminum melting furnace, due to the shielding effect of the graphite cylinder 4 on a magnetic field, the electromagnetic stirring force of the induction furnace can be reduced, the problems of too high hump and cracking of molten aluminum, the oxidation loss of the molten aluminum and the like are reduced.
When the coreless induction furnace is heated, the graphite cylinder 4 is an integral circular ring in an alternating magnetic field, the formed current is stable, and the problems of impact and noise of furnace burden ignition to an intermediate frequency power supply caused by poor contact of the furnace burden can be avoided.
The graphite also has the advantages of high temperature resistance, good corrosion resistance, small coefficient of thermal expansion in the high-temperature use process, certain strain resistance to rapid cooling and rapid heating, stable chemical performance, no reaction with molten metal in the melting process and the like, the graphite cylinder 4 is arranged at a lower position in the middle of the hearth, and the graphite cylinder 4 is soaked in the molten metal in most of the working process and isolated from air, so that the oxidation loss of the graphite can be effectively reduced, and the service life of the graphite cylinder 4 is greatly prolonged.
Specifically, the thickness of the induction coil 3 ranges from 30mm to 50 mm.
Specifically, the refractory furnace body 1 is formed by sintering a refractory ramming material. The most widely applied refractory ramming mass is a dry furnace building method, generally a powder material is built through a mold, and is formed after sintering and demolding, and the requirements of sufficient refractoriness, good thermal stability, good chemical stability, small thermal expansion coefficient, higher mechanical property and the like are required. After the refractory ramming material is sintered and molded, a hearth of the coreless induction melting furnace is arranged inside the refractory ramming material, a metal raw material to be melted is placed inside the hearth, and electric energy is converted into heat energy by utilizing the electromagnetic induction principle.
Specifically, the insulating layer 2 is made of insulating refractory mortar; the insulating refractory mortar has high insulating property after being dried and solidified.
Specifically, the furnace further comprises a graphite crucible which is arranged in the refractory furnace body 1. The graphite crucible can also be embedded in the refractory material when the charge is tied off to prevent the graphite crucible from moving or falling off during working or tilting.
In addition, the graphite cylinder 4 can be replaced by other materials which have good magnetic conductivity and conductivity, long service life and do not pollute the molten liquid.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, and that the scope of the invention is defined by the appended claims.
Claims (7)
1. The utility model provides a can improve medium frequency induction melting furnace of melting efficiency, includes the melting furnace body, its characterized in that: the melting furnace body comprises a refractory furnace body, an insulating layer, an induction coil and a graphite cylinder;
the coating in the fire-resistant furnace body outside has the insulating layer, and induction coil evenly twines the insulating layer outside on the fire-resistant furnace body, and outside intermediate frequency power is connected at induction coil's both ends, and graphite cylinder's outside laminating sets up on the inner wall of fire-resistant furnace body and lies in fire-resistant furnace body along the intermediate position of direction of height.
2. The medium frequency induction melting furnace capable of improving melting efficiency according to claim 1, wherein: the height of the graphite cylinder is 30-80% of the height of the refractory furnace body.
3. The medium frequency induction melting furnace capable of improving melting efficiency according to claim 2, wherein: the distance from the bottom of the graphite cylinder to the bottom of the refractory furnace body is 0-50% of the height of the refractory furnace body, and the distance from the top of the graphite cylinder to the top of the refractory furnace body is 20-70% of the height of the refractory furnace body.
4. The medium frequency induction melting furnace capable of improving melting efficiency according to claim 1, wherein: the thickness of the induction coil ranges from 30mm to 50 mm.
5. The medium frequency induction melting furnace capable of improving melting efficiency according to claim 1, wherein: the refractory furnace body is formed by sintering refractory ramming materials.
6. The medium frequency induction melting furnace capable of improving melting efficiency according to claim 1, wherein: the insulating layer is made of insulating refractory mortar.
7. The medium frequency induction melting furnace capable of improving melting efficiency according to claim 1, wherein: also comprises a graphite crucible arranged in the refractory furnace body.
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| CN202021232270.2U CN212870727U (en) | 2020-06-29 | 2020-06-29 | Intermediate frequency induction melting furnace capable of improving melting efficiency |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701502A (en) * | 2021-09-03 | 2021-11-26 | 厦门升泓机械设备有限公司 | Induction furnace based on high-temperature refractory metal carbide preparation |
| CN115900352A (en) * | 2022-12-12 | 2023-04-04 | 常州创明磁性材料科技有限公司 | Furnace building mold and furnace building method for medium-frequency induction furnace |
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2020
- 2020-06-29 CN CN202021232270.2U patent/CN212870727U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701502A (en) * | 2021-09-03 | 2021-11-26 | 厦门升泓机械设备有限公司 | Induction furnace based on high-temperature refractory metal carbide preparation |
| CN113701502B (en) * | 2021-09-03 | 2024-02-27 | 厦门升泓机械设备有限公司 | Induction furnace based on high-temperature refractory metal carbide preparation |
| CN115900352A (en) * | 2022-12-12 | 2023-04-04 | 常州创明磁性材料科技有限公司 | Furnace building mold and furnace building method for medium-frequency induction furnace |
| CN115900352B (en) * | 2022-12-12 | 2023-12-01 | 常州创明磁性材料科技有限公司 | Medium frequency induction furnace building mold and furnace building method thereof |
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