Integrated electromagnetic heating plate and integrated electromagnetic heater

Abstract

The utility model discloses an integrated electromagnetic heating plate and an integrated electromagnetic heater. Comprising an integrated electromagnetic heating plate and a high-frequency power supply, the integrated electromagnetic heating plate at least comprises an electromagnetic coil plate and an induction metal heating plate which are arranged in parallel at an interval, and an insulating layer is arranged between the electromagnetic coil plate and the induction metal heating plate; the electromagnetic coil plate is provided with two electrodes; and the two electrodes are connected with the output end of the high-frequency power supply or the two electrodes are connected with the output end of the high-frequency power supply through a transformer. The multi-layer heating device can realize large-area uniform heating, can be made into any shape, is particularly suitable for multi-layer uniform heating under a limited space condition, and has a wide application prospect.

Description

Technical Field

[0001] The utility model relates to an integrated electromagnetic heating plate and an integrated electromagnetic heater, which are applied to heat sources for drying, baking and frying food, Chinese medicinal materials, medicines, nuts, chemical materials, wood, building materials and other agricultural products and other materials. Background Art

[0002] With the development of industry and agriculture, people have developed technologies such as hot air circulation drying, vacuum drying, and airflow drying. The heating methods include fin-type electric heating tubes, circulating hot water, steam, thermal oil, heat pumps, etc. The disadvantage of these technologies is that the heat source is separated from the material, and an intermediate medium (such as air, water, etc.) is required to transfer heat between the heat source and the dried material. This method has theoretical defects, because when the heat transfer medium passes through the material, the material continuously absorbs heat, and the temperature of the medium gradually decreases, causing a temperature difference between the front and back ends of the material (if there is no temperature difference, it means that the material has not absorbed heat, and the drying process cannot be achieved). This temperature difference causes a large difference in the drying time of the front and back ends of the material. The front end material is too dry and loses too much water, and the back end material contains too much water. It is difficult to accurately control the water content, which reduces the product quality. It requires continuous inversion operations, which is labor-intensive and wastes energy.

[0003] During vacuum drying, since there is no air medium to transfer heat, the heat can only be transferred to the bottom of the baking tray by hot water or heat transfer oil flowing through the heating platform (due to the pressure, there is a pipe under the platform). The disadvantage is that the bottom of the baking tray and the heating platform must be very flat, and the processing precision is high, so the processing cost is high. At the same time, the material can only absorb heat from the bottom of the baking tray, and the upper end of the material cannot absorb heat, so the heat exchange efficiency is half as low, and the drying time is prolonged. At the same time, the weight of the platform plus the heat transfer medium is very large, the residual heat is large, the preheating time is long, and the energy waste is large. What's more troublesome is that the heat transfer process is very sensitive to foreign matter on the platform and under the baking tray (because the temperature cannot be high, the radiation is limited; if the temperature is too high, the pressure is high; there is no air, and close contact is required for heat transfer), which needs to be cleaned at any time, and the workload is large.

[0004] These occasions require large-area uniform heating, and in order to reduce the floor space, most of them are multi-layer structures.

[0005] The traditional electromagnetic heating structure has a thick insulation layer under the heating plate, and a wire coil made of multiple strands of wire under the insulation layer. This electromagnetic heating structure is completely unsuitable for heating from above for the following reasons: 1. The wire coil needs fan cooling, which requires a large space; 2. The size of the wire coil is limited. If it is too large, it is difficult to manufacture, install, and form; 3. The magnetic field distribution of this wire coil is uneven, resulting in uneven heating. Utility Model Content

[0006] In order to solve the above problems and overcome the defects of the traditional electromagnetic heater structure, the utility model provides an integrated electromagnetic heater.

[0007] To achieve the above purpose, the integrated electromagnetic heating plate of the utility model comprises at least an electromagnetic coil plate and an induction metal heating plate arranged in parallel and spaced apart, an insulating layer is arranged between the electromagnetic coil plate and the induction metal heating plate; the electromagnetic coil plate has two electrodes.

[0008] Furthermore, the induction metal heating plate includes an upper induction metal heating plate and a lower induction metal heating plate; the electromagnetic coil plate is arranged between the upper induction metal heating plate and the lower induction metal heating plate; and an insulating layer is arranged between the electromagnetic coil plate and the upper induction metal heating plate and the lower induction metal heating plate.

[0009] Furthermore, the electromagnetic coil plate is a hollow metal plate formed by cutting or stamping the metal plate by physical or chemical means, and the hollow metal plate is a continuous rotating or convoluted metal strip, and both ends of the metal strip are electrodes.

[0010] Furthermore, the cross-sectional width of the metal strip is more than 6 times its thickness.

[0011] Furthermore, the metal strip is a very long maze-like spiral strip directly cut from a metal plate; or a rectangular spiral circle; or a circular planar multi-turn spiral circle, with one electrode on the outside and the other electrode in the middle; or composed of two semicircular spiral circles, with one electrode on the outside and the other electrode on the outside.

[0012] In order to achieve the above-mentioned object, the integrated electromagnetic heater of the utility model is characterized in that it comprises an integrated electromagnetic heating plate and a high-frequency power supply, wherein:

[0013] The integrated electromagnetic heating plate at least comprises an electromagnetic coil plate and an induction metal heating plate arranged in parallel and at intervals, an insulating layer is arranged between the electromagnetic coil plate and the induction metal heating plate; the electromagnetic coil plate has two electrodes;

[0014] The two electrodes are connected to the output end of the high-frequency power supply or the two electrodes are connected to the output end of the high-frequency power supply through a transformer.

[0015] Furthermore, the integrated electromagnetic heating plate is bent into a cylindrical shape, an arc shape or a U shape.

[0016] Furthermore, a supporting beam is arranged under the integrated electromagnetic heating plate.

[0017] Furthermore, a pressure strip is arranged on the integrated electromagnetic heating plate.

[0018] Furthermore, a thermal insulation is arranged below the lower insulating layer, and a support plate is arranged below the thermal insulation.

[0019] In the utility model, the electromagnetic coil plate that generates a magnetic field and the upper induction metal heating plate and the lower induction metal heating plate that generate eddy current heating are tightly combined into one through a thin insulating layer. The electromagnetic coil plate is very long and its width is much larger than its thickness. There is a thin heat-conducting insulating layer between the electromagnetic coil plate and the upper heating plate and the lower heating plate. When a high-frequency current passes through the electromagnetic coil plate, eddy currents are generated in the upper heating plate and the lower heating plate, and the eddy currents cause the upper heating plate and the lower heating plate to heat up. At the same time, the electromagnetic coil plate also generates heat due to its own resistance, and the heat is transferred to the upper heating plate and the lower heating plate. However, the insulating layer between the electromagnetic coil plate and the upper heating plate and the lower heating plate is very thin, so the temperature difference generated is very small. The eddy currents in the upper heating plate and the lower heating plate per unit area are only related to the current of the electromagnetic coil plate closest to them, so the heating is uniform, whether in the middle position or on both sides.

[0020] In the utility model, since cooling is not required, the upper heating plate, the upper insulating layer, the electromagnetic coil plate, the lower insulating layer and the lower heating plate can be tightly stacked and made into one body, the overall thickness can be very small, and the lateral size can be very large, which is very suitable for multi-layer large-area uniform heating and can be made into any shape; the heat of the electromagnetic coil plate is also utilized, so it is more energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a top view of the integrated electromagnetic heater without the upper heating plate according to an embodiment of the utility model.

[0022] Figure 2 Shown is a schematic structural diagram of an integrated electromagnetic heater according to an embodiment of the utility model.

[0023] Figure 3 Shown is a plan view of the electromagnetic coil plate of an embodiment of the utility model.

[0024] Figure 4 The figure shows the centerline trajectory of an electromagnetic coil plate with an electrode led out from the middle in another embodiment of the utility model.

[0025] Figure 5 Shown is a centerline trajectory diagram of a spiral electromagnetic coil plate according to another embodiment of the utility model.

[0026] Figure 6 Shown is a centerline trajectory diagram of an electromagnetic coil plate composed of two semicircular loops in another embodiment of the utility model.

[0027] Figure 7 Shown is a schematic structural diagram of another embodiment of the utility model having a supporting crossbeam and a pressure strip.

[0028] Figure 8 Shown is a schematic structural diagram of single-sided heating in another embodiment of the present invention.

[0029] Among them: 1-high frequency power supply, 2-magnetic core, 3-primary coil, 4-secondary coil, 5-rear side bar, 6-electrode, 7-electromagnetic coil plate, 8-side side bar, 9-front side bar, 10-electrode outlet, 11-upper heating plate, 12-upper insulation layer, 13-lower insulation layer, 14-lower heating plate, 15-support beam, 16-pressing bar, 17-insulation, 18-support plate. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The integrated electromagnetic heating plate of the utility model at least comprises an electromagnetic coil plate and an induction metal heating plate arranged in parallel and spaced apart, and the electromagnetic coil plate and the induction metal heating plate are connected as a whole through an insulating layer. The electromagnetic coil plate in the utility model is a hollow metal plate formed by "cutting" or stamping the metal plate by physical or chemical means, or is made by other methods, and the hollow metal plate is a continuous rotating or convoluted metal strip, such as Figures 3 to 6As shown, it can be a long maze-like spiral strip cut directly from a metal plate; or a rectangular spiral circle; or a circular multi-turn spiral circle; or two semicircular spiral circles. The two ends of the metal strip are electrodes.

[0034] The width of the metal strip can be designed as needed. Generally, the width of the cross section of the metal strip is more than 6 times the thickness.

[0035] The material of the electromagnetic coil plate can be selected from metal materials with low resistivity, such as gold, silver, copper, aluminum, iron or their alloys, etc., as needed;

[0036] The physical method includes but is not limited to turning, milling, planing, grinding, casting, spraying and the like; the chemical method includes but is not limited to chemical etching and the like;

[0037] The induction metal heating plate is generally made of ferromagnetic metal material, but non-ferromagnetic metal material with high resistivity can also be used;

[0038] The dimensions of the electromagnetic coil plate and the induction metal heating plate should be similar to facilitate processing and production; preferably, in order to protect the electromagnetic coil plate, the induction metal heating plate can be slightly larger than the electromagnetic coil plate; in particular, the electromagnetic coil plate can be smaller than the induction metal heating plate. The thickness of the electromagnetic coil plate and the induction metal heating plate can be designed according to needs.

[0039] The induction metal heating plate can be arranged on one side or both sides of the electromagnetic coil plate, and the thermal efficiency is higher when it is arranged on both sides.

[0040] The above-mentioned insulating material can be various insulating heat-resistant materials. Preferably, a viscous heat-resistant resin or coating can be used. This material can make the insulating layer thinner, so that the electromagnetic coil plate as a whole is thinner.

[0041] In the above structure, the electromagnetic coil plate that generates a magnetic field and the upper induction metal heating plate and the lower induction metal heating plate that generate eddy current heating are tightly combined into one through a thin insulating layer. The electromagnetic coil plate is very long and its width is much larger than its thickness. There is a thin thermal conductive insulating layer between the electromagnetic coil plate and the upper induction metal heating plate and the lower induction metal heating plate. When a high-frequency current passes through the electromagnetic coil plate, eddy currents are generated in the upper induction metal heating plate and the lower induction metal heating plate. The eddy currents cause the upper heating plate and the lower heating plate to heat up. At the same time, the electromagnetic coil plate also generates heat due to its own resistance, and conducts the heat to the upper heating plate and the lower heating plate. However, the insulating layer between the electromagnetic coil plate and the upper heating plate and the lower heating plate is very thin, so the temperature difference generated is very small. The eddy currents in the upper heating plate and the lower heating plate per unit area are only related to the current of the electromagnetic coil plate closest to them.

[0042] The utility model uses a high-frequency power supply to convert industrial frequency alternating current into alternating current with a frequency of generally 1 to 200kHz or even higher. When the high-frequency current flows through the conductor, a high-frequency magnetic field is generated around the conductor, causing eddy currents to be generated in the nearby metal, which causes the metal to heat up. At the same time, when the high-frequency current flows through the conductor, it will also generate heat due to its own resistance, and the high-frequency current will generate a skin effect, which will increase the equivalent resistance and generate more heat. In special cases, direct industrial frequency power supply can also be used, but the efficiency is much lower.

[0043] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0044] Example 1

[0045] like Figure 1 As shown, the utility model embodiment is an integrated electromagnetic heater, including 1-high frequency power supply, 2-magnetic core, 3-primary coil, 4-secondary coil, 5-rear side bar, 6-electrode, 7-electromagnetic coil plate, 8-side bar, 9-front side bar, 10-electrode outlet, 11-upper heating plate, 12-upper insulating layer, 13-lower insulating layer, 14-lower heating plate

[0046] The electromagnetic coil plate 7 is cut from a plate, with an upper insulating layer 12 arranged on it, and a lower insulating layer 13 arranged below it, an upper heating plate 11 arranged above the upper insulating layer 12, and a lower heating plate 14 arranged below the lower insulating layer 13, the electrode 6 of the electromagnetic coil plate 7 is led out from the electrode outlet 10 of the upper heating plate 11, and a front side strip 9, a side side strip 8 and a rear side strip 5 are arranged around it.

[0047] Preferably, the heater can be made into the optimal shape required by the heated object according to actual conditions.

[0048] The working principle of the integrated electromagnetic heater in the embodiment of the utility model is as follows:

[0049] After the high-frequency power supply 1 is started, when the high-frequency current generated by the high-frequency power supply 1 flows through the primary coil 3, a high-frequency magnetic field is induced in the magnetic core 2, and the high-frequency magnetic field induces a high-frequency current in the secondary coil 4. The high-frequency current flows to the electromagnetic coil plate 7, and a high-frequency magnetic field is generated near the electromagnetic coil plate 7. The high-frequency magnetic field generates eddy currents in the upper heating plate 11 and the lower heating plate 14. The eddy currents make the upper heating plate 11 and the lower heating plate 14 heat up. At the same time, the electromagnetic coil plate 7 itself heats up by resistance, and the generated heat is conducted to the upper heating plate 11 and the lower heating plate 14 through the upper insulating layer 12 and the lower insulating layer 13. Due to the isolation of the transformer, the power grid has low requirements for the upper insulating layer 12 and the lower insulating layer 13, and they can be very thin (such as less than 0.2mm), so the temperature difference between the electromagnetic coil plate 7 and the upper heating plate 11 and the lower heating plate 14 is small. The width of the electromagnetic coil plate 7 is much larger than the thickness, the coupling between adjacent parts is small, and the heating is uniform.

[0050] The parasitic capacitance between the primary coil 3 and the secondary coil 4 of the transformer is very small, so the total parasitic capacitance of the power grid to the upper heating plate 11 and the lower heating plate 14 is also very small, and the high-frequency leakage current generated is very small. The transformer also achieves load impedance matching.

[0051] By adjusting the output frequency of the high-frequency power supply 1, the heating power can be adjusted, thereby controlling the heating temperature.

[0052] Since the insulation layer is very thin, the heating area is large, and the total area of ​​the electromagnetic coil plate is large, the electromagnetic coil plate and the upper and lower heating plates are equivalent to a huge flat capacitor. The role of the transformer: 1) to increase the impedance of the power grid to the upper and lower heating plates, and reduce leakage current; 2) to isolate the power grid, ensure safety when the insulation layer is damaged, and reduce the requirements for insulation; 3) to achieve load impedance matching by adjusting the transformation ratio.

[0053] Example 2

[0054] like Figure 4 As shown, in this embodiment, one electrode of the electromagnetic coil plate 7 is led out from the outside, and the other electrode is led out from the middle.

[0055] Example 3

[0056] like Figure 5 As shown, in this embodiment, the electromagnetic coil plate 7 is a circular spiral, one electrode is led out from the outside, and the other electrode is led out from the middle, which is suitable for circular heating.

[0057] Example 4

[0058] like Figure 6 As shown, in this embodiment, the electromagnetic coil plate 7 is composed of two semicircular loops, and the two electrodes are both led out from the outside, which is suitable for circular heating and easier to connect.

[0059] Example 5

[0060] like Figure 7 As shown, in this embodiment, the support beam 15 supports the lower heating plate 14, and the pressure strip 16 presses the upper heating plate 11, so that the heater is not easily deformed by heat.

[0061] Example 6

[0062] like Figure 8 As shown, this embodiment is suitable for single-sided heating, and a heat preservation 17 is arranged under the electromagnetic coil plate 7 and the lower insulating layer 13.

[0063] It should be noted that the utility model also has other variants. The electromagnetic coil plate can be made into various shapes and its width can also be changed to adapt to various heating. Because the heater is small in thickness, it can be pressed into various shapes, such as cylindrical, etc.

[0064] The utility model also has other modified applications, such as adding a high heat conductive plate such as an aluminum plate or a copper plate on the heating plate to make the heating more uniform.

[0065] The utility model is described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the utility model. Many other changes and modifications that do not depart from the concept and scope of the utility model should be considered as the protection scope of the utility model.

[0066] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0067] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An integrated electromagnetic heating plate, characterized in that: It at least comprises an electromagnetic coil plate and an induction metal heating plate which are arranged in parallel and at intervals, wherein the electromagnetic coil plate and the induction metal heating plate are integrated into one body through an insulating layer; and the electromagnetic coil plate has two electrodes.

2. The integrated electromagnetic heating plate according to claim 1, characterized in that: The induction metal heating plate comprises an upper induction metal heating plate and a lower induction metal heating plate; the electromagnetic coil plate is arranged between the upper induction metal heating plate and the lower induction metal heating plate; an insulating layer is arranged between the electromagnetic coil plate and the upper induction metal heating plate and the lower induction metal heating plate.

3. The integrated electromagnetic heating plate according to claim 1, characterized in that: The electromagnetic coil plate is a hollow metal plate formed by cutting or punching the metal plate by physical or chemical means. The hollow metal plate is a continuous rotating or convoluted metal strip, and both ends of the metal strip are electrodes.

4. The integrated electromagnetic heating plate according to claim 3, characterized in that: The cross-sectional width of the metal strip is more than 6 times its thickness.

5. The integrated electromagnetic heating plate according to claim 3, characterized in that: The metal strip is a long maze-like spiral strip cut directly from a metal plate; or a rectangular spiral circle; or a circular plane multi-turn spiral circle, with one electrode on the outside and the other electrode in the middle; or composed of two semicircular spiral circles, with one electrode on the outside and the other electrode on the outside.

6. An integrated electromagnetic heater, characterized in that: It includes an integrated electromagnetic heating plate and a high-frequency power supply, wherein: The integrated electromagnetic heating plate at least comprises an electromagnetic coil plate and an induction metal heating plate arranged in parallel and at intervals, an insulating layer is arranged between the electromagnetic coil plate and the induction metal heating plate; the electromagnetic coil plate has two electrodes; The two electrodes are connected to the output end of the high-frequency power supply or the two electrodes are connected to the output end of the high-frequency power supply through a transformer.

7. The integrated electromagnetic heater according to claim 6, characterized in that: The integrated electromagnetic heating plate is bent into a cylindrical shape, an arc shape or a U shape.

8. The integrated electromagnetic heater according to claim 6, characterized in that: A supporting crossbeam is arranged under the integrated electromagnetic heating plate.

9. The integrated electromagnetic heater according to claim 6, characterized in that: A pressure strip is arranged on the integrated electromagnetic heating plate.

10. The integrated electromagnetic heater according to claim 6, characterized in that: A heat preservation layer is arranged below the insulating layer, and a support plate is arranged below the heat preservation layer.

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