WO2017035895A1

WO2017035895A1 - Induction heating device and manufacturing method thereof

Info

Publication number: WO2017035895A1
Application number: PCT/CN2015/091298
Authority: WO
Inventors: 孙侥鲜; 刘秀强; 王长明; 谢守德; 徐丹
Original assignee: 东莞劲胜精密组件股份有限公司; 东莞华程金属科技有限公司
Priority date: 2015-09-01
Filing date: 2015-09-30
Publication date: 2017-03-09
Also published as: CN105082455A

Abstract

Provided are an induction heating device and a manufacturing method thereof. The induction heating device comprises: a receiving body (3); a heating coil (5); and a covering layer (7). The receiving body (3) comprises a bottom wall and a side wall surrounding the bottom wall. The heating coil (5) winds around the bottom wall and the side wall in multiple turns and is bond-fixed thereto. The covering layer (7) is inject-molded on the heating coil (5), and the heating coil (5) is wrapped between the covering layer (7) and the receiving body (3). The heating coil (5) comprises two contacts (6) at two distal ends thereof. The two contacts (6) are exposed from the covering layer (7) to form positive and negative poles.

Description

Induction heating device and manufacturing method thereof

[Technical Field]

The invention relates to an induction heating device and a manufacturing method thereof.

【Background technique】

Electrical products are more and more widely used in our lives. People's improvement of the quality of life has promoted the development of electrical products. The heating coil of the ordinary electrical product is generally a 2D coil, and the heating of the 2D coil generally heats the bottom of the inner pot, and the heat is transmitted from the bottom of the container to the upper portion through contact conduction, so that the temperature of the pot is slow and the heat is not uniform.

[Summary of the Invention]

In view of the above, it is necessary to provide an induction heating device that is heated at a high temperature and uniform in heat, and a method of fabricating the same.

An induction heating device comprising: a receiving body comprising a bottom wall and a side wall surrounding the bottom wall; and a heating coil distributed around the plurality of turns and fixedly attached to the bottom wall and the side wall, the heating coil And comprising two contacts respectively disposed at two ends, and a cover layer formed on the heating coil by injection molding, and coating the heating coil between the cover layer and the receiving body, the two contacts Exposed from the cover layer to form a positive and negative electrode.

A method for manufacturing an induction heating device includes the following steps:

Injection molding to form a receiving body, the receiving body comprising a bottom wall and a side wall surrounding the bottom wall;

Forming a heating body by using a metal material, the shape of the heating body matching the shape of the receiving body;

Attaching the heating body to the bottom wall and the side wall of the receiving body;

Processing the heating body into a plurality of turns of a heating coil that is circumferentially distributed and attached to the bottom wall and the side wall, the heating coil including two contacts respectively located at both ends;

Forming a cover layer on the heating coil to cover the heating coil between the cover layer and the receiving body, and the two contacts are exposed from the cover layer to form a positive and negative electrode.

Since the heating coil is disposed around the bottom wall and the side wall of the receiving body, it can be extended in a three-dimensional space, so that the area can be designed to be larger, and the surrounding heating can be realized, thereby improving the heating effect and allowing the receiving. The pot on the body heats up quickly and the heating effect is more uniform.

[Description of the Drawings]

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and those skilled in the art can obtain drawings of other embodiments according to the drawings without any creative work.

Figure 1 is a perspective view of a receiving body of an embodiment;

2 is a perspective view of a heating body of an embodiment;

Figure 3 is a perspective view of the heating body of Figure 1 combined with the housing shown in Figure 2;

Figure 4 is a perspective view showing the formation of a heating coil on the housing shown in Figure 3;

Figure 5 is a perspective view of the heating coil shown in Figure 4 after injection molding;

Figure 6 is a partial schematic view showing the contact of the heating coil and the recess of the cover layer of an embodiment;

Fig. 7 is a flow chart showing the steps of a method of fabricating an induction heating device according to an embodiment.

【detailed description】

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the understanding of the present disclosure will be more fully understood.

Referring to FIGS. 1 through 6, an induction heating device 100 (see FIG. 6) of an embodiment includes a housing 3, a heating coil 5, and a cover layer 8. The housing 3 is formed by injection molding and includes a bottom wall and a side wall surrounding the bottom wall. The overall contour of the heating coil 5 is in the shape of a pot and is distributed around a plurality of turns, and is fixedly attached to the bottom wall and the side wall of the receiving body 3. The covering layer 8 is injection-molded on the heating coil 5 to cover the heating coil 5. Between the cover layer 8 and the container 3. The heating coil 5 includes two contacts 6 at its both ends, and the contacts 6 are exposed from the cover layer 8 to form positive and negative electrodes. In the present embodiment, the outer surface of the heating coil 5 is attached and fixed to the inner surface of the housing 3. Since the heating coil 5 is attached to the bottom wall and the side wall of the housing 3, it is not surrounded by the same plane, and thus may be referred to as a 3D heating coil. In other embodiments, the heating coil 5 can be attached and fixed to the outer surface of the housing 3.

In the present embodiment, the cover layer 8 is provided with a recess 7 at the position of the contact 6 to expose the contact 6 to the recess 7. The edge of the housing 3 is also integrally formed with a positioning buckle 4. The positioning buckles 4 are plural and are evenly spaced along the circumference of the housing 3 for positioning the housing 3 .

When the heating coil 5 is powered on by the contact 6, a surrounding magnetic field can be formed. When heating, the metal pot is placed in the receiving body 3, and the alternating magnetic field lines in the close magnetic field pass through the magnetic of the nearby metal pot. Metal (iron, cobalt, nickel) materials will drive the microcrystalline structure of the metal, resulting in a myriad of small eddy currents, so that the microstructure of the metal material itself rubs against each other and heats itself, thus achieving the purpose of non-contact heating of the metal material. The induction heating device 100 is heated by electromagnetic induction, and the heating coil 5 itself does not generate heat due to the magnetic field, and the heating ability and efficiency are high.

Since the heating coil 5 is disposed on the bottom wall and the side wall of the receiving body 2, the area of the heating coil 5 can be designed to be larger, and wraparound heating can be realized, thereby improving the heating effect and making the receiving body 3 warm up quickly. And the heating effect is more uniform. At the same time, the induction heating device 100 saves space, and the induction heating device 100 can be small in size and light in overall weight.

The induction heating device 100 has a uniform magnetic field distribution, a large effective induction area, uniform heating, high heating efficiency, and stable product performance. The pot-shaped heating body 1 is processed and integrally formed with the injection molding material to form an induction heating device 100, which can be used for products such as intelligent heating pots. In addition to the conventional bottom heating, the surrounding heating of the entire inner liner can be achieved, and the heating is obtained very uniformly. The overall heating effect, the heating area is increased by 50% compared with the ordinary coil, the temperature rises rapidly and the heating is uniform. The power of the induction heating device of the present invention can easily reach about 1500 watts and is high in efficiency compared to the heat limit of several hundred watts of the heat resistance of the limited coil of the conventional coil.

In addition to being used as an induction heating coil, the heating coil 5 of the present invention can also be used for purposes such as conducting electricity, receiving signals from an antenna, and the like.

Since the overall injection molding of the heating coil 5 is not exposed, only the two contacts 6 are exposed, so that the heating coil 5 is well protected, especially corrosion-resistant, and can be reliably waterproofed, which can greatly extend the service life of the product. The heating coil 5 is integrally molded and wrapped, and the problem that a short circuit may occur between the wires of the coil after the product is used for a long time. It is also advantageous to obtain a higher quality factor by heating the coil 5, thereby significantly reducing the loss and increasing the inductance of the coil.

Induction heating device 100 can be widely used in various electrical fields, such as smart home appliances, including smart pots, smart refrigerators, smart TVs, etc., providing dustproof, scratch-resistant and anti-corrosion for future multi-functional consumer electronics induction heating devices. Excellent solutions such as anti-drop, shockproof and anti-oxidation.

Referring to FIG. 7, a method for manufacturing an induction heating device according to an embodiment includes the following steps:

Step S101, injection molding forms the housing 3, and the housing 3 includes a bottom wall and a side wall surrounding the bottom wall. Referring to FIG. 1 , the material of the container 3 can be any plastic or ceramic material. The plastic is, for example, PC, ABS, PC+ABS, PC+20%GF, and the like. The thickness of the container 3 is 1 to 3 mm. When injection molding, the nozzle temperature is 270 to 300 ° C, the mold temperature is 60 to 100 ° C, and the injection pressure is 50 to 80 MPa. Specifically, the housing 3 is also in the shape of a pot, and the positioning buckle 4 is integrally formed at the edge thereof. The positioning buckles 4 are plural and are evenly spaced along the circumference of the housing 3 for positioning the housing 3 .

In step S102, the heating body 1 is formed of a metal material, and the shape of the heating body 1 matches the shape of the housing 3.

Referring to FIG. 2, the heating body 1 can be stamped and formed from a metal material according to the shape desired for the product. The heating body 1 can be made of a metal material having good electrical conductivity, small electrical resistivity and fast heat dissipation, such as silver, brass, phosphor bronze, beryllium copper and the like. The heating body 1 can be formed by stamping, including cutting, stretching, punching and the like. Alternatively, the heating body 1 has a bottom portion and a side portion that match the bottom wall and the side wall of the housing body 3, and both have a length and a width of 160 mm or more. In an embodiment, the heating body 1 may be subjected to nickel plating treatment of the metal material before being formed by stamping.

In step S103, the heating body 1 is attached and fixed to the bottom wall and the side wall of the container 3. Referring to FIG. 3 , in particular, the bottom and side portions of the heating body 1 can be respectively attached and fixed to the bottom wall and the side wall of the receiving body 3 by means of a backing or a dispensing primer. In one embodiment, the outer surface of the heating body 1 is attached and fixed to the inner surface of the housing 3. It can be understood that in another embodiment, the inner surface of the heating body 1 can also be attached and fixed to the outer surface of the container 3.

In step S104, the heating body 1 is processed into a plurality of turns of the heating coil 5 which is distributed around the bottom wall and the side wall, and the contacts 6 are respectively formed on both ends of the heating coil 5. Referring to FIG. 4, the receiving body 3 can be fixed on the jig, and the heating body 1 is processed into a heating coil 5 by a process such as CNC, laser engraving and/or engraving. The width of the heating coil 5 and the coil pitch can be set as needed. Alternatively, the coil has a width of 1.5-6 mm and a line width of 0.5-3 mm for obtaining a larger inductance value and better inductivity. In various embodiments, each turn of the heating coil 5 is circular, square or polygonal, or several shapes in parallel or the like. Then, two contacts 6 are formed at both ends (i.e., both ends of the head and the tail) of the heating coil 5. Two metal contacts 6 can be soldered at the respective locations. The two contacts 6 can be pretreated, such as nickel plated or gold plated. Nickel plating can prevent the surface of the product from chemically reacting with oxygen or chlorine in the air or water, which can keep the appearance clean and bright and prolong the service life. It is gold-plated and has good chemical stability.

In step S105, a cover layer 8 is formed on the heating coil 5 to cover the heating coil 5 between the cover layer 8 and the receiving body 3. The two contacts 6 are exposed from the cover layer 8 to form a positive and negative electrodes. Referring to FIG. 5, for example, the heating pot 2 can be placed in a mold, and plastic is injected into the mold to cover the heating coil 5 and expose the two contacts 6 so that the two contacts 6 form a positive and negative electrode. The injection molding material used for the cover layer 8 may be a plastic material or a ceramic material suitable for injection molding.

As shown in FIG. 6, in an embodiment, in step S105, the step of exposing the two contacts 6 of the heating coil 5 is specifically: the cover layer 8 leaves an empty slot 7 at the position of the contact 6, so that The contact 6 is exposed in the recess 7.

The heating coil 5 is processed by pressing a whole piece of metal after CNC, laser engraving and/or engraving, laser cutting, etc. The width and coil spacing of the heating coil 5 can be processed and adjusted according to actual needs in a very flexible and convenient manner.

It can be understood that the order of step S101 and step S102 can be reversed.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

An induction heating device, comprising:

a receiving body comprising a bottom wall and a side wall surrounding the bottom wall;

The heating coil is distributed around the plurality of turns and is fixedly attached to the bottom wall and the side wall, and the heating coil includes two contacts respectively located at both ends, and

a cover layer is formed on the heating coil by injection molding, and the heating coil is wrapped between the cover layer and the receiving body, and the two contacts are exposed from the cover layer to form a positive or negative pole.
The induction heating apparatus according to claim 1, wherein each of said heating coils is circular, square or polygonal.
The induction heating device according to claim 1, wherein the heating coil is made of silver, brass, phosphor bronze or beryllium copper.
The induction heating device according to claim 1, wherein a plurality of positioning buckles are integrally formed on an edge of the receiving body, and the plurality of positioning buckles are evenly spaced along a circumference of the receiving body.
The induction heating device according to claim 1, wherein an outer surface of said heating coil is attached and fixed to an inner surface of said housing.
The induction heating device according to claim 1, wherein said heating coil is fixed to said container by means of a backing or a dispensing primer.
The induction heating device according to claim 1, wherein said cover layer is formed with a recess at a position of said contact, and said contact is exposed in said recess.
A method for manufacturing an induction heating device includes the following steps:

Injection molding to form a receiving body, the receiving body comprising a bottom wall and a side wall surrounding the bottom wall;

Forming a heating body by using a metal material, the shape of the heating body matching the shape of the receiving body;

Attaching the heating body to the bottom wall and the side wall of the receiving body;

Processing the heating body into a plurality of turns of a heating coil that is circumferentially distributed and attached to the bottom wall and the side wall, the heating coil including two contacts respectively located at both ends;

Forming a cover layer on the heating coil to cover the heating coil between the cover layer and the receiving body, and the two contacts are exposed from the cover layer to form a positive and negative electrode .
The method of claim 8 wherein said heating body is stamped from silver, brass, phosphor bronze or beryllium copper.
The method of claim 8 wherein said housing and said cover layer are injection molded from a plastic or ceramic material.
The method of claim 8 wherein said heating body is processed using a CNC, laser engraving and/or engraving process to form said heating coil.