阅读说明：本技术 一种用于电磁感应加热的电热组件的应用 (Application of electric heating assembly for electromagnetic induction heating ) 是由 徐惠民 居小伟 陈伟 于 2018-07-28 设计创作，主要内容包括：本发明涉及电加热技术领域,其公开了一种用于电磁感应加热的电热组件的应用。所述电热组件包括由中心部位向外按同一盘绕方向进行盘绕布置的导线,所述导线盘绕后其相邻导线段之间设置有间距,所述导线的外围设置有绝缘体,所述绝缘体的外围包围有导磁体,且在所述导磁体上沿着所述导线的盘绕路径设有用于控制磁路定向的开口,所述导磁体的开口朝向待加热物体的加热部位；所述电热组件用于铁磁性金属模具的加热。本发明拓展了电磁感应加热装置的应用范围,并通过该应用的实施,提高了对铁磁性物体的加热能力,达到环保节能的效果。(The invention relates to the technical field of electric heating, and discloses application of an electric heating assembly for electromagnetic induction heating. The electric heating component comprises a lead which is coiled and arranged from the center part to the outside according to the same coiling direction, a space is arranged between adjacent lead sections of the lead after the lead is coiled, an insulator is arranged on the periphery of the lead, a magnetizer is surrounded on the periphery of the insulator, an opening for controlling the orientation of a magnetic circuit is arranged on the magnetizer along the coiling path of the lead, and the opening of the magnetizer faces to the heating part of the object to be heated; the electric heating assembly is used for heating the ferromagnetic metal mold. The invention expands the application range of the electromagnetic induction heating device, improves the heating capacity of ferromagnetic objects by implementing the application, and achieves the effects of environmental protection and energy saving.)

1. The application of the electric heating assembly for electromagnetic induction heating is characterized in that the electric heating assembly comprises conducting wires which are coiled from a central part to the outside in the same coiling direction, after the conducting wires are coiled, a space is arranged between adjacent conducting wire sections of the conducting wires, an insulator is arranged on the periphery of the conducting wires, a magnetizer is surrounded on the periphery of the insulator, an opening for controlling the orientation of a magnetic circuit is arranged on the magnetizer along the coiling path of the conducting wires, and the opening of the magnetizer faces to a heating part of the object to be heated; the electric heating assembly is used for heating the ferromagnetic metal mold.

2. Use of an electric heating element for electromagnetic induction heating according to claim 1, characterised in that the insulation is a number of ceramic spacers which are sheathed on the conductor.

3. The use of an electric heating element according to claim 1, wherein said magnetic conductor is formed by laminating a plurality of silicon steel sheets with openings.

4. Use of an electric heating element according to claim 3 for electromagnetic induction heating, wherein the silicon steel sheet is a C-type silicon steel sheet.

5. The use of an electric heating assembly according to claim 1, wherein the conducting wire, the insulator and the magnetizer are packaged together by a high temperature resistant glue.

6. Use of an electric heating element for electromagnetic induction heating according to claim 5, characterised in that the high temperature resistant glue is a high temperature resistant inorganic glue.

7. Use of an electric heating element for electromagnetic induction heating according to claim 1, characterised in that the wire is a copper wire or a copper tube.

8. Use of an electric heating element for electromagnetic induction heating according to claim 1, characterized in that the mould is a sand-shooting mould for casting.

9. The use of an electric heating assembly for electromagnetic induction heating according to claim 8, wherein the sand-shooting mold comprises an iron mold for forming a cavity surface of the casting sand mold, and an iron sand box which is matched with the iron mold, a sand-shooting hole is arranged on the sand box, a cavity is arranged on the iron mold, and the electric heating assembly for electromagnetic induction heating is arranged in the cavity.

Technical Field

The invention relates to the technical field of electric heating, in particular to application of an electric heating assembly for electromagnetic induction heating.

Background

Conventional electric heating devices generally have two configurations: one is that an electric heating tube is adopted, and the electric heating wire in the electric heating tube generates heat after being electrified to heat an object to be heated; the other type is that the electromagnetic induction principle is utilized, and the induction coil is adopted to heat the ferromagnetic object, and the alternating current with a certain frequency is loaded in the induction coil, so that the coil generates an alternating magnetic field, the alternating magnetic field acts on the ferromagnetic object to be heated, the inside of the ferromagnetic object generates a large eddy current due to electromagnetic induction, and the ferromagnetic object generates heat to play a heating role.

Typical electromagnetic induction heating apparatuses include induction cookers, intermediate frequency ovens, and the like.

However, the conventional electromagnetic induction heating apparatus generally has the following problems: the alternating magnetic field generated in the electromagnetic induction coil can only heat ferromagnetic objects which are close to the electromagnetic induction coil, when the electromagnetic induction coil has a certain distance with the objects to be heated, the heating effect can be obviously reduced or even the expected heating effect can not be achieved due to the sharp attenuation of the magnetic field, and therefore the application range of the electromagnetic induction heating device is limited.

Disclosure of Invention

The invention aims to adopt an electromagnetic induction heating device with an improved structure and apply the electromagnetic induction heating device to the heating of ferromagnetic objects, thereby expanding the application range of the electromagnetic induction heating device, improving the heating capacity of the ferromagnetic objects through the application and achieving the effects of environmental protection and energy saving. The specific technical scheme is as follows:

the application of an electric heating assembly for electromagnetic induction heating comprises a lead which is coiled from a central part to the outside along the same coiling direction, wherein after the lead is coiled, a space is arranged between adjacent lead sections of the lead, an insulator is arranged on the periphery of the lead, a magnetizer is surrounded on the periphery of the insulator, an opening for controlling the orientation of a magnetic circuit is arranged on the magnetizer along the coiling path of the lead, and the opening of the magnetizer faces to a heating part of an object to be heated; the electric heating assembly is used for heating the ferromagnetic metal mold.

The heating that has adopted an electric heating element who improves the structure to realize ferromagnetic metal mold among the above-mentioned technical scheme, it coils the wire according to same coiling direction in order to form magnetic induction's heating coil, simultaneously, set up the directional magnetizer of taking the opening of control magnetic circuit in the wire periphery that coils, it is with the help of the good magnetic permeability of magnetizer, make the alternating magnetic field who produces on heating coil (wire) can realize induction conduction and the directional control of magnetic circuit through the magnetizer, and then can make in the scope that is covered by the directional magnetic circuit of magnetizer control, its ferromagnetic object obtains effectual heating. Compared with the traditional electromagnetic induction heating device, the direction of the magnetic circuit is changed through the magnetizer, and a ferromagnetic object with a certain distance from a heating coil (wire) can be heated; meanwhile, the directional control of the magnetic circuit is also beneficial to improving the heating effect.

As a preferable scheme of the insulator in the invention, the insulator is a plurality of ceramic space rings sleeved on the lead.

The ceramic space ring is sleeved on the lead, and the adjacent ceramic space rings are mutually overlapped and butted.

The ceramic space ring arranged on the periphery of the lead has an insulating function on one hand and also has a heat dissipation function on the lead on the other hand. In addition, the ceramic space rings are arranged in a mutual overlapping mode, and the other advantage is that the ceramic space rings can easily turn along with the coiled wires, so that the installation is convenient.

As a preferred embodiment of the magnetizer of the present invention, the magnetizer is formed by laminating a plurality of silicon steel sheets with openings.

As a preferable scheme of the silicon steel sheet in the invention, the silicon steel sheet is a C-type silicon steel sheet.

The C-shaped silicon steel sheet in the electric heating assembly is arranged, so that when a ferromagnetic object is heated, the opening of the C-shaped silicon steel sheet on the heating coil (wire) faces to one side of the ferromagnetic object to be heated, a heating magnetic field which is spaced from the wire by a certain distance and is used for heating the ferromagnetic object can be formed, and a good heating effect is achieved.

In the invention, the conducting wire, the insulator and the magnetizer are packaged into a whole through high-temperature-resistant glue.

Preferably, the high-temperature-resistant glue is a high-temperature-resistant inorganic glue.

As one of preferable embodiments of the wire winding arrangement in the present invention, the wire is wound in a clockwise direction.

As a second preferable mode of the wire winding arrangement in the present invention, the wire is wound in a counterclockwise direction.

As a third preferable mode of the wire winding arrangement in the present invention, the wound shape of the wire is a circular disk shape.

As a fourth preferable mode of the wire winding arrangement in the present invention, the shape of the wire after winding is rectangular.

As a fifth preferable mode of the wire winding arrangement in the present invention, the shape of the wound wire is adapted to the shape of the heating area of the object to be heated.

The lead wire in the invention comprises a solid lead wire and a hollow lead wire.

As a preferable scheme of the invention, the conducting wire is a copper wire or a copper pipe.

As a preferable scheme of the wire, the diameter of the wire is 5-15 mm.

Preferably, the mold is a sand-shooting mold for casting.

In the invention, the sand shooting mould comprises an iron mould for forming a cavity surface of a casting sand mould and an iron sand box which is involuted with the iron mould, wherein the sand box is provided with a sand shooting hole, the iron mould is provided with a cavity, and the cavity is internally provided with the electric heating assembly for electromagnetic induction heating.

Wherein, the electric heating component is fixed on the cavity wall arranged on the iron mold through high temperature resistant glue;

as a preferred scheme of the sand shooting mould, the iron mould is a lower iron mould, and the sand box is an upper sand box.

In order to enhance the heating effect, the electric heating assembly arranged on the lower iron mold is arranged as close as possible to the cavity surface of the lower iron mold.

Wherein, the opening of the C-shaped silicon steel sheet of the electric heating component arranged in the cavity of the lower iron mold is arranged upwards.

For large-scale sand-shooting moulds, to facilitate modular design, manufacture and installation, a plurality of electric heating assemblies may be arranged in the cavity of the lower iron mould.

In the invention, in order to enable the electric heating component to be close to the cavity surface of the sand shooting mould as much as possible, the upper surface of the cavity of the lower iron mould is provided with a three-dimensional curved surface structure, the three-dimensional curved surface is arranged at equal distance with the cavity surface on the upper sand box, and simultaneously, the upper end surface formed by overlapping the silicon steel sheets on the electric heating component also forms a three-dimensional curved surface structure and is matched with the upper surface of the cavity.

Because the electric heating component with the improved structure can heat the mould only in a short heating time, the process flow of the molding of the casting sand can be properly changed or optimized, for example, the sand injection of the cold mould and the heating of the mould can be carried out. It is also conceivable to heat the mold simultaneously with the sand shooting.

When the heating device is used, the upper sand box and the lower iron mold are combined together, meanwhile, alternating current is loaded in the electric heating assembly, so that the heating coil (wire) generates an alternating magnetic field, the alternating magnetic field is conducted through the magnetic induction of the C-shaped silicon steel sheet on the electric heating assembly, and the magnetic force line of the alternating magnetic field can upwards penetrate through the lower iron mold and enter the upper sand box to form a magnetic loop, so that the lower iron mold and the upper sand box are simultaneously heated. And after the lower iron mold and the upper sand box are heated, starting the sand shooting system, and injecting the molding sand into a cavity formed by the alignment of the lower iron mold and the upper sand box through the sand shooting hole, so as to form a casting shell. When the upper sand box and the lower iron mold are manufactured, the cavity surface of the upper sand box can be made into a rough surface, and the cavity surface of the lower iron mold can be made into a smooth surface. Because the cavity surface on the cope flask is rough and the cope flask is provided with sand shooting holes, the bonding force between the sand shell and the cope flask is larger than that between the sand shell and the lower iron mold. The molding sand for shooting sand molding can adopt precoated sand, the sand is cooled after the shooting sand molding is finished, and the sand shell shrinks due to cooling and can be left on the cope flask.

For a casting part with an upper parting surface and a lower parting surface, an upper sand shell and a lower sand shell with sand boxes can be respectively manufactured according to the method, and the manufactured upper sand shell with sand boxes and the manufactured lower sand shell with sand boxes are combined along the parting surfaces to form a casting cavity which can be used for casting parts.

It should be noted that, as the sand shooting mould using the electric heating assembly of the present invention, the arrangement of the sand box and the iron mould which are coupled in pairs can be changed, and besides the sand box and the iron mould are arranged in an up-and-down manner, the sand box and the iron mould can also be arranged in a horizontal direction, for example, the left iron mould and the right sand box are arranged in a matching manner, or the right iron mould and the left sand box are arranged in a matching manner. In addition, the electric heating assembly can be arranged on the iron mold and the sand box, and the heating effect on the sand-shooting mold can be achieved.

Above-mentioned penetrate sand mould go up electric heating element's setting, it utilizes electromagnetic induction heating principle can realize penetrating sand mould's rapid heating, with the sand mould among the prior art adopt the electrothermal tube to carry out the mode that heats compare, have following advantage:

firstly, the heating rate is fast, efficient: the traditional sand shooting mould is solid due to heat accumulation, and the heating speed of the electric heating pipe is low, so that the sand shooting moulding can be carried out by preheating for hours in advance in order to heat the mould and the moulding sand.

Secondly, energy conservation and environmental protection: the electric heating component of the invention adopts the silicon steel sheet to carry out magnetic circuit directional control heating, the heat is concentrated on the cavity surface close to the sand shooting mould during heating, the lower iron mould and the upper sand box are heated after being folded, and the sand shell after molding is left on the sand box, thus greatly reducing the thickness of the sand layer of the medium sand molding in the mould and reducing the sand consumption, and the consumed electric energy is less, thereby having good energy-saving and environment-friendly effects on the design of the sand shooting mould. The traditional heating mode has no directional heating function, needs the whole mould body to heat, and has high energy consumption.

Thirdly, the cooling structure of the die can be simplified: after the traditional sand shooting mould is shaped, because the heat of the mould is large, the cooling of the mould needs to be carried out by adopting a cooling copper pipe and cooling water. After the electric heating assembly is applied to the sand-shooting mold, the heating is directional heating controlled by a magnetic circuit, the heating time is short, the total heat is small, a special cooling device is not needed, and the heat dissipation of the lead can be realized through the heat conduction of the ceramic space ring, so that the cooling structure of the mold is simplified.

It should be further noted that the application range of the electric heating assembly for electromagnetic induction heating of the present invention is not limited to sand shooting molds, and can be used for heating conventional sand molding molds, other molds of different types which need to be heated, and non-mold ferromagnetic objects or appliances.

The invention has the beneficial effects that:

firstly, the invention relates to an application of an electric heating component for electromagnetic induction heating, which adopts an electric heating component with an improved structure to realize the heating of a ferromagnetic metal mold, coils a lead according to the same coiling direction to form a magnetic induction heating coil, and simultaneously, arranges a magnetizer with an opening at the periphery of the coiled lead for controlling the orientation of a magnetic circuit, so that an alternating magnetic field generated on the heating coil (lead) can realize the induction conduction and the orientation control of the magnetic circuit through the magnetizer by virtue of the good permeability of the magnetizer, thereby effectively heating a ferromagnetic object in the range covered by the oriented magnetic circuit controlled by the magnetizer. Compared with the traditional electromagnetic induction heating device, the direction of the magnetic circuit is changed through the magnetizer, and a ferromagnetic object with a certain distance from a heating coil (wire) can be heated; meanwhile, the directional control of the magnetic circuit is also beneficial to improving the heating effect.

Secondly, the C-shaped silicon steel sheet in the electric heating assembly is arranged to enable the opening of the C-shaped silicon steel sheet on the heating coil (wire) to face one side of the ferromagnetic object to be heated when the ferromagnetic object is heated, so that a heating magnetic field of the ferromagnetic object to be heated with a certain distance from the wire can be formed, and a good heating effect is achieved.

Thirdly, the electric heating component for electromagnetic induction heating of the invention has fast heating speed and high efficiency: the traditional sand shooting mould is solid due to heat accumulation, and the heating speed of the electric heating pipe is low, so that the sand shooting moulding can be carried out by preheating for hours in advance in order to heat the mould and the moulding sand.

Fourthly, the electric heating component for electromagnetic induction heating of the invention adopts the silicon steel sheet to carry out magnetic circuit directional control heating, the heat is concentrated on the cavity surface close to the sand shooting mould when in heating, the lower iron mould and the upper sand box are heated simultaneously after being folded, and the sand shell after molding is left on the sand box, thus greatly reducing the sand layer thickness of the sand molding in the mould, reducing the sand consumption, consuming less electric energy and having good energy-saving and environment-friendly effects on the design of the sand shooting mould. The traditional heating mode has no directional heating function, needs the whole mould body to heat, and has high energy consumption.

Fifth, the application of the electric heating assembly for electromagnetic induction heating of the present invention can simplify the cooling structure of the mold: after the traditional sand shooting mould is shaped, because the heat of the mould is large, the cooling of the mould needs to be carried out by adopting a cooling copper pipe and cooling water. After the electric heating assembly is applied to the sand-shooting mold, the heating is directional heating controlled by a magnetic circuit, the heating time is short, the total heat is small, a special cooling device is not needed, and the heat dissipation of the lead can be realized through the heat conduction of the ceramic space ring, so that the cooling structure of the mold is simplified.

Drawings

FIG. 1 is a schematic diagram of an electrical heating assembly used in an application of an electrical heating assembly for electromagnetic induction heating of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a schematic diagram of a wire winding configuration;

FIG. 4 is a schematic view of another coiled configuration of the wire;

fig. 5 is a schematic structural diagram of an electric heating assembly for electromagnetic induction heating applied to a sand shooting mould according to the present invention.

In the figure: 1. the device comprises a lead 2, an insulator 3, a silicon steel sheet 4, high temperature resistant glue 5, a sand shooting mold 6, an iron mold 7, a sand box 8, a sand shooting hole 9, a cavity 10, an electric heating component 11, high temperature resistant glue 12 and a sand shell.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.