Distributed electromagnetic heating drying equipment
Through distributed electromagnetic heating and drying equipment, the integrated electromagnetic heating plate is driven by high-frequency power supply, uniform radiation heating of materials is achieved, solving the problems of low heat transfer efficiency and uneven temperature in traditional drying technology, and achieving high efficiency, energy-saving and uniform heating effects.
Patent Information
- Application Number
- CN202421300742.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-07
AI Technical Summary
In the existing drying technology, the heat source is separated from the material, resulting in low heat transfer efficiency, uneven temperature, large energy loss, and long drying time and difficult to control product quality.
The distributed electromagnetic heating and drying equipment is adopted, and the integrated electromagnetic heating plate is driven by a high-frequency power supply, the electromagnetic coil plate and the induction metal heating plate are combined into one, and the materials are uniformly heated by radiation.
It achieves efficient heat transfer, uniform temperature, energy saving, shortened drying time, no need for reverse plate operation, short preheating time, and small heat of the heating plate.
Smart Images
Figure CN222783880U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a distributed electromagnetic heating drying device, which is used for drying baked and fried food, Chinese medicinal materials, medicines, nuts, chemical materials, wood, building materials and other agricultural products and other materials. Background Art
[0002] At room temperature, wet materials are prone to mildew and are not conducive to preservation. Traditional drying methods such as sun drying or natural air drying are greatly affected by weather and natural environment and are no longer suitable for modern industrial and agricultural production.
[0003] 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 disadvantages of these technologies are 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. The heat transfer efficiency is low, the temperature is uneven, and the energy loss is large. At the same time, the temperature difference between the intermediate medium air and the material is large. During dehumidification, the temperature of the discharged hot air is high, and energy waste is serious. High-humidity hot air also damages the surrounding environment. These methods all have 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 rear 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 rear end materials. The front end material is too dry and loses too much water, while the back end material contains too much water. It is impossible to accurately control the water content of the material, which reduces the product quality. It requires manual multiple plate turning operations, which is labor-intensive and wastes energy.
[0004] The principle of hot air circulation drying technology is that during the hot air circulation process, when the hot air passes through the gaps between the heat exchangers of the heat source, it absorbs the heat of the heat source, the air temperature rises, and when it passes through the gaps between the baking trays, it transfers the heat to the material. After the material absorbs the heat, the moisture in the material evaporates into water vapor and is taken away by the hot air. When the moisture content of the hot air exceeds a certain value, it is discharged, and so on. The disadvantages of this technology are large wind resistance, uneven wind field distribution, uneven temperature, low heat exchange efficiency, large temperature difference between the front and rear materials, and large required air volume. The reason is that the heat source and the material are completely separated. First, the air is heated into hot air, and the hot air transfers heat to the material when passing through the material. Due to the large wind resistance of the heat source heat exchanger, the wind speed and temperature at various places in the wind field vary greatly. When the hot air passes through the gaps between the baking trays, it manifests as longitudinal through-the-hall wind and small lateral flow, so the heat transfer efficiency is low and the drying time is long. Especially for the materials in the middle baking tray, due to the small gap and relatively small air flow, the drying time is particularly different from the drying time of the materials in the edge baking trays. Moreover, when the air passes through the material, the material continuously absorbs heat, the air temperature gradually decreases, and the temperature difference between the front and rear air temperatures is large. Therefore, it is necessary to cool down the air in the middle and perform manual reversal operations, which increases labor costs. During dehumidification, the hot air temperature is much higher than the material temperature, and the exhaust air temperature is high, which wastes energy, and the high humidity air affects the surrounding environment.
[0005] Some drying methods use circulating hot water, steam, and heat transfer oil. Many small tubes are densely arranged in the oven. Circulating hot water, steam, and heat transfer oil pass through the tubes, and the baking tray is placed on the tubes. The disadvantage of this technology is that the welding of a large number of small tubes is labor-intensive and costly. The weight of the small tubes plus the heat transfer medium is particularly large, so the residual heat is large, the preheating time and the cooling time are long, and energy is wasted. In addition, the baking tray is in line contact with the small tubes, and the heat transfer effect is not good. If the temperature is high, it is easy to overheat near the contact point. If the temperature is increased, the pressure of the pipeline (water pipe or oil pipe) will increase significantly, so the temperature cannot be too high, and the radiation heating effect on the upper surface of the material is limited.
[0006] During vacuum drying, since there is no air medium to transfer heat, the heat can only be transferred by hot water or heat transfer oil flowing through the heating platform to heat the bottom of the baking tray. The disadvantage is that the bottom of the baking tray and the heating platform must be very flat, and the processing accuracy must be particularly 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. At the same time, the heat transfer process is very sensitive to foreign matter on the heating platform, which must be removed at any time, and the cleaning is particularly troublesome. Utility Model Content
[0007] In order to overcome the above-mentioned defects, the purpose of the utility model is to provide a distributed electromagnetic heating drying equipment.
[0008] In order to achieve the above-mentioned purpose, the utility model provides a distributed electromagnetic heating drying device, a distributed electromagnetic heating drying device, characterized in that it comprises a cabinet, wherein the cabinet comprises an equipment compartment and a heating compartment; a high-frequency power supply is arranged in the equipment compartment;
[0009] A material rack is provided in the heating bin;
[0010] A plurality of integrated electromagnetic heating plates are arranged on the support frame at intervals through the heating frame.
[0011] The integrated electromagnetic heating plate at least comprises an electromagnetic coil plate and an induction metal heating plate arranged in parallel and spaced apart, wherein the electromagnetic coil plate and the induction metal heating plate are integrated into one body through an insulating layer; the electromagnetic coil plate has two electrodes;
[0012] The two output ends of the high-frequency power supply are electrically connected to the two lead-out electrodes of each integrated electromagnetic heating plate.
[0013] 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.
[0014] 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.
[0015] Furthermore, the cross-sectional width of the metal strip is more than 6 times its thickness.
[0016] 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.
[0017] Furthermore, an insulating seat is provided in the heating chamber, and a plurality of electrode springs are provided on the insulating seat, the electrode springs are electrically connected to the output end of the high-frequency power supply in the equipment chamber, and the lead-out electrodes of the integrated electromagnetic heating plate are elastically in contact with the electrode springs either individually or through a busbar;
[0018] Furthermore, an insulating tube is provided between the equipment compartment and the heating compartment, the lead-out electrode of the integrated electromagnetic heating plate is electrically connected to the busbar, a conductive column is provided on the busbar, and the conductive column passes through the insulating tube into the equipment compartment and is electrically connected to the output end of the high-frequency power supply;
[0019] Furthermore, a material tray guide rail is arranged on the support frame between the integrated electromagnetic heating plates.
[0020] Furthermore, the heating chamber is a vacuum chamber or the air pressure inside the chamber is lower than the air pressure outside the chamber; an air extraction pipe and an air inlet pipe are arranged on the heating chamber.
[0021] Furthermore, a material conveying device is provided between the integrated electromagnetic heating plates.
[0022] The utility model directly distributes the integrated electromagnetic heating plate densely and evenly above and below the material. The upper and lower surface areas of the integrated electromagnetic heating plate are huge. The radiation is used to radiate heat to the upper surface of the material and the bottom of the material tray, and the material is heated up and down. When hot air circulation drying is performed, the circulating air no longer has the function of a heat transfer medium but only has the function of taking away the evaporated water vapor. Therefore, the air temperature is not much different from the material temperature. At the same time, since there is no heat exchanger, the wind resistance is small, the air volume is small, and the power consumed by the fan is also reduced; when vacuum drying is performed, in a vacuum state, heat can also be radiated to the material from both the upper and lower directions. The vacuum does not affect the heat transfer, and precision processing is no longer required; through radiation heat transfer, it is no longer sensitive to foreign matter; since there is no pipeline, increasing the temperature will not cause an increase in pressure, so the temperature can be increased and the radiation capacity can be enhanced. Plate heating has a large surface area and a small total weight, so the preheating time is short and the residual heat is small. The utility model distributes the heating plates densely and evenly above and below the material, heats the material up and down, and has the advantages of efficient heat transfer, uniform temperature, energy saving, shortened drying time, no need for inverting the tray, short preheating time, and small residual heat of the heating plate. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 Shown is a schematic structural diagram of a circulating hot air distributed electromagnetic heating drying device according to an embodiment of the utility model.
[0024] Figure 2 Shown is a structural diagram of an integrated electromagnetic heating plate.
[0025] Figure 3 Shown is a top view of the integrated electromagnetic heating plate with the upper heating plate removed.
[0026] Figure 4 Shown is a plan view of the electromagnetic coil plate in the integrated electromagnetic heating panel.
[0027] Figure 5Shown is a schematic diagram of the docking of the material tray rack on the material trolley and the integrated electromagnetic heating plate.
[0028] Figure 6 Shown is a simplified schematic diagram of the structure of the vacuum distributed electromagnetic heating drying equipment according to an embodiment of the utility model.
[0029] Figure 7 Shown is a schematic structural diagram of the continuous belt distributed electromagnetic heating drying equipment of an embodiment of the utility model.
[0030] Figure 8 Shown is a simplified schematic diagram of the structure of the tunnel-type distributed electromagnetic heating drying equipment according to an embodiment of the utility model.
[0031] Among them: 1-high frequency conversion unit; 2-primary coil; 3-secondary coil; 4-magnetic core; 5-electrode combination device; 6-secondary coil terminal; 7-insulator; 8-integrated electromagnetic heating plate; 9-rear beam of heating frame; 10-integrated electromagnetic heating plate lead-out electrode; 11-hot air circulation channel; 12-dehumidification device; 13-fan; 14-insulation; 15-front beam of heating frame; 16-integrated electromagnetic heating plate pressure strip; 17-heating frame cross beam; 18-heating frame side strip; 19-heating frame side beam; 20-door handle; 21-integrated electromagnetic heating plate installation column; 22-integrated Electromagnetic heating plate electrode; 23-integrated electromagnetic heating plate electrode outlet; 24-upper heating plate; 25-upper insulating layer; 26-electromagnetic coil plate; 27-lower insulating layer; 28-lower heating plate; 29-integrated electromagnetic heating plate side strip; 30-integrated electromagnetic heating plate front strip; 31-integrated electromagnetic heating plate rear strip; 32-trolley pallet baffle; 33-trolley pallet frame; 34-trolley column; 35-trolley wheel; 36-exhaust pipe; 37-intake pipe; 38-feed hopper; 39-conveyor belt; 40-baffle plate; 41-discharge hopper; 42-material conveying / material tray support device. DETAILED DESCRIPTION
[0032] 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.
[0033] 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.
[0034] 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.
[0035] The utility model uses a high-frequency power supply to convert 50Hz industrial frequency alternating current into high-frequency alternating current with a frequency of 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, the conductor through which the high-frequency current flows has its own resistance and will also generate heat. Due to the skin effect generated by the high-frequency current, the equivalent resistance increases and more heat is generated. The control system controls the heating power and thus the heating temperature by controlling the frequency and size of the high-frequency current. It is also possible to use industrial frequency power supply directly, but the efficiency is much lower.
[0036] The utility model discloses a distributed electromagnetic heating drying equipment, a distributed electromagnetic heating drying equipment, comprising a cabinet, wherein the cabinet comprises an equipment compartment and a heating compartment; a high-frequency power supply is arranged in the equipment compartment; a support frame is arranged in the heating compartment; a plurality of integrated electromagnetic heating plates are arranged on the support frame at intervals through the heating frame, the integrated electromagnetic heating plate at least comprises an electromagnetic coil plate and an induction metal heating plate arranged in parallel at intervals, the electromagnetic coil plate and the induction metal heating plate are integrated into one by an insulating layer; the electromagnetic coil plate has two electrodes; the two output ends of the high-frequency power supply are electrically connected to the two lead-out electrodes of each integrated electromagnetic heating plate.
[0037] The integrated electromagnetic heating plate in 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 present invention is a hollow metal plate formed by "cutting" or stamping the metal plate by physical or chemical means on the metal plate, and the hollow metal plate is a continuous rotating or convoluted metal plate strip, such as Figure 3 to Figure 4As 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.
[0038] 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.
[0039] 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;
[0040] The physical method includes but is not limited to turning, milling, planing, grinding and the like; the chemical method includes but is not limited to chemical etching and the like;
[0041] The induction metal heating plate is generally made of ferromagnetic metal material;
[0042] 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.
[0043] 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.
[0044] 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.
[0045] The high-frequency power supply includes a high-frequency conversion unit and a transformer, and the transformer includes a primary coil, a secondary coil and a magnetic core.
[0046] 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.
[0047] like Figure 1 As shown, the distributed electromagnetic heating drying equipment of the utility model includes a box body, and the box body includes an equipment compartment and a heating compartment; a high-frequency power supply is arranged in the equipment compartment; a support frame is arranged in the heating compartment, and a plurality of integrated electromagnetic heating plates are arranged on the support frame through the heating frame; the high-frequency power supply includes a high-frequency conversion unit and a transformer, and the transformer includes a primary coil, a secondary coil and a magnetic core. The output end of the high-frequency conversion unit is electrically connected to the primary side of the transformer, and the secondary side of the transformer is electrically connected to the two lead-out electrodes of the integrated electromagnetic heating plate; the above-mentioned high-frequency power supply can be selected and designed as needed.
[0048] Since the thickness of the upper and lower insulating layers 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, to ensure safety when the upper or lower insulating layer is damaged, and to reduce the requirements and thickness of insulation; 3) to achieve load impedance matching by adjusting the transformation ratio.
[0049] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0050] Example 1
[0051] like Figure 1 As shown, an embodiment of the utility model is a circulating hot air distributed electromagnetic heating and drying equipment, including a high-frequency conversion unit 1, a primary coil 2, a secondary coil 3, a magnetic core 4, a secondary coil terminal 6, an electrode combining device 5, an integrated electromagnetic heating plate 8, a hot air circulation channel 11, a dehumidification device 12, a fan 13, insulation 14, an integrated electromagnetic heating plate mounting column 21, a door handle 20, a casing, a temperature measurement system and a control system, etc.
[0052] A plurality of integrated electromagnetic heating plates are arranged on an integrated electromagnetic heating plate mounting column 21 at a certain interval through a heating frame, wherein the heating frame comprises: a heating frame front beam 15, a heating frame rear beam 9, a heating frame side bar 18, a heating frame side beam 19, a heating frame cross beam 17, an integrated electromagnetic heating plate pressure bar 16, and an integrated electromagnetic heating plate lead-out electrode 10; the integrated electromagnetic heating plate 8 comprises an upper induction metal heating plate 24, an upper insulating layer 25, an electromagnetic coil plate 26, a lower induction metal insulating layer 27, a lower induction metal heating plate 28, an integrated electromagnetic heating plate electrode 22, an integrated electromagnetic heating plate front side bar 30, an integrated electromagnetic heating plate rear side bar 31, and an integrated electromagnetic heating plate side side bar 29 that are closely contacted and stacked; The integrated electromagnetic heating plate 8 is sandwiched between the heating frame crossbeam 17 and the integrated electromagnetic heating plate pressure strip 16; the integrated electromagnetic heating plate electrode 22 is led out through the integrated electromagnetic heating plate electrode outlet 23 of the upper heating plate 24, and is electrically connected to the integrated electromagnetic heating plate lead-out electrode 10; the integrated electromagnetic heating plate lead-out electrode 10 is insulated and arranged on the rear beam 9 of the heating frame through the insulator 7; the integrated electromagnetic heating plate lead-out electrode 10 is electrically connected to the secondary coil 3 of the transformer through the electrode combining device 5 and the secondary coil terminal 6, the primary coil 2 of the transformer is electrically connected to the high-frequency conversion unit 1, and the primary coil 2 and the secondary coil 3 are installed on the magnetic core 4 to share the magnetic circuit; the upper end of the drying equipment is the hot air circulation channel 11, Figure 1 The arrow in the figure indicates the direction of air flow; the dehumidification device 12 and the circulating fan 13 are arranged on the top of the drying equipment; the casing, insulation, temperature measurement system, control system, etc. are all necessary.
[0053] Example 2
[0054] As a further improvement of the above embodiment, an insulating seat is provided in the heating chamber, a plurality of electrode springs are provided on the insulating seat, the electrode springs are electrically connected to the output end of the transformer, and the electrodes of the integrated electromagnetic heating plate are elastically in contact with the electrode springs either individually or through a busbar;
[0055] Example 3
[0056] As a further improvement of the above embodiment, an insulating tube is arranged between the equipment compartment and the heating compartment, the integrated electromagnetic heating plate leads out the electrode and is connected to the bus bar, a conductive column is arranged on the bus bar, and the conductive column enters the equipment compartment through the insulating tube and is electrically connected to the output end of the transformer.
[0057] Example 3
[0058] As a further improvement of the above embodiment, a material tray guide is provided on the integrated electromagnetic heating plate mounting column 21 and on the support frame between each integrated electromagnetic heating plate, so that the material does not need to be loaded with a trolley, but the material can be directly pushed in with a tray;
[0059] The working principle of the circulating hot air distributed electromagnetic heating drying equipment in the embodiment of the utility model is as follows:
[0060] Push the cart loaded with materials into the heating bin, insert each layer of trays loaded with materials between the corresponding integrated electromagnetic heating plates, and close the door. Start the control system. When the high-frequency current generated by the high-frequency conversion unit 1 flows through the primary coil 2, a high-frequency magnetic field is induced in the magnetic core 4. This high-frequency magnetic field induces a high-frequency current in the secondary coil 3. The high-frequency current flows to the electromagnetic coil plate 26, thereby generating eddy currents in the upper heating plate 24 and the lower heating plate 28. The eddy currents cause the upper induction metal heating plate 24 and the lower induction metal heating plate 28 to heat up. At the same time, the electromagnetic coil plate 26 generates heat due to its own resistance, and the heat is transferred to the upper induction metal heating plate 24 and the lower induction metal heating plate 28 through the upper insulating layer 25 and the lower insulating layer 27 respectively. Due to the upper insulating layer 25, the upper insulating layer 27 is electrically conductive to the upper induction metal heating plate 24 and the lower induction metal heating plate 28. The thickness of the insulating layer 25 and the lower insulating layer 27 is very thin, and the temperature difference between the electromagnetic coil plate 26 and the upper induction metal heating plate 24 and the lower induction metal heating plate 28 is very small; when the temperature of the upper induction metal heating plate 24 and the lower induction metal heating plate 28 rises, heat is radiated to the upper surface of the material in the trolley baking tray and the bottom of the baking tray, the temperature of the material rises, and the moisture in the material continuously evaporates into water vapor and is carried away by the circulating air flow; when the humidity of the circulating hot air exceeds a certain value, the dehumidification device 12 is started to discharge the wet steam out of the box, and this process is repeated until the material is dried; the control system and the temperature measurement system control the drying temperature.
[0061] Since the secondary coil 3 and the primary coil 2 are connected by magnetic field induction coupling, the electromagnetic coil plate 26 is completely electrically isolated from the power grid and is therefore safe; at the same time, the parasitic capacitance between the secondary coil 3 and the primary coil 2 is very small, so the parasitic capacitance between the power grid and the upper heating plate 24 and the lower heating plate 28 is also very small, and thus the leakage current is also very small; the transformer also reduces the operating voltage of the electromagnetic coil plate 26 and the thickness of the upper insulating layer 25 and the lower insulating layer 27.
[0062] Since the radiation area of the upper induction metal heating plate 24 and the lower induction metal heating plate 28 is very large (20 times the surface area of the same power warp-type electric heating tube), during the operation, a very high temperature is not required to radiate the heat required for drying. At the same time, since the integrated electromagnetic heating plate 8 has a small thickness, a small total weight, and a large surface area, the temperature is low, the waste heat is small, and the temperature control is more accurate. Figure 2 The structure diagram of the integrated electromagnetic heating plate 8 is shown. Figure 3 The figure shows a top view of the integrated electromagnetic heating plate after removing the upper heating plate 24. Figure 4 The figure shows a plan view of the electromagnetic coil plate 26 in the integrated electromagnetic heating plate. Figure 5 The figure shows the connection between each layer of the material tray rack on the material cart and each layer of the integrated electromagnetic heating plate in the heating bin.
[0063] Example 4
[0064] Figure 6 This is another embodiment of the utility model. The integrated electromagnetic heating plate is arranged in a vacuum box or a vacuum tank to form a vacuum distributed electromagnetic heating drying device. The exhaust pipe 36 is connected to the vacuum pump, and the air inlet pipe 37 is connected to the nitrogen tank or directly to the atmosphere through the air valve. Since the utility model is mainly radiation heating, and it is heated up and down, the working temperature of the integrated electromagnetic heating plate 8 can be higher under the vacuum state. Therefore, compared with other vacuum drying technologies, the heat transfer efficiency is higher and the drying speed is faster. At the same time, traditional vacuum drying is conduction heat transfer, and there cannot be anything on the heating plate. It is very sensitive to residues and needs to be cleaned frequently, which is a large workload; while the integrated electromagnetic heating plate 8 of the utility model is radiation heat transfer, which is not sensitive to residues, can greatly reduce labor intensity, and has greater advantages.
[0065] Example 5
[0066] Figure 7 It is another embodiment of the utility model, the integrated electromagnetic heating plate is installed above and below the conveyor belt 39 to form a continuous belt type distributed electromagnetic heating drying device, which can be a single layer or multiple layers of continuous belt drying, Figure 7 There are three layers in the middle, and the integrated electromagnetic heating plate radiates heat uniformly up and down on each layer of material. The material enters the drying equipment from the feed hopper 38, and is heated up and down as the conveyor belt slowly moves forward, and the moisture in the material evaporates. When the material reaches the end of each layer, it falls into the conveyor belt of the next layer, continues to be dried, and finally is discharged from the discharge hopper 41. The function of the baffle plate 40 is to prevent the material from falling from the layer. The arrow in the figure is the direction of material movement. The continuous belt drying equipment has a large output, but the continuous belt dryer implemented by the existing heating technology uses circulating hot air drying, which has uneven temperature and low efficiency.
[0067] Example 6
[0068] Figure 8 It is another embodiment of the utility model. The integrated electromagnetic heating plate is installed in the tunnel drying equipment. The integrated electromagnetic heating plate can be arranged in 1 to 1 layers at intervals up and down, and in 1 to 1 sections horizontally. The tunnel can be vacuum or normal pressure type; a material conveying device is arranged between the integrated electromagnetic heating plates.
[0069] The present invention also has other variations, such as a fixed material tray guide rail or a material tray support frame or a material conveying device is provided between the integrated electromagnetic heating plates.
[0070] The present invention also has other variations, such as the electromagnetic coil plate 26 can be cut into various shapes by laser, and the integrated electromagnetic heating plate 8 can be formed into other shapes, such as a cylindrical shape.
[0071] The utility model also has other modified applications, such as arranging a conveyor belt in a long vacuum tank, installing the integrated electromagnetic heating plate above and below the conveyor belt, and forming a vacuum continuous belt type distributed electromagnetic heating drying device.
[0072] 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.
[0073] 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.
[0074] 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.
[0075] 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. A distributed electromagnetic heating drying device, characterized in that: It comprises a cabinet, wherein the cabinet comprises an equipment compartment and a heating compartment; a high-frequency power supply is arranged in the equipment compartment; A support frame is provided in the heating chamber; A plurality of integrated electromagnetic heating plates are arranged on the support frame at intervals through the heating frame. The integrated electromagnetic heating plate at least comprises an electromagnetic coil plate and an induction metal heating plate arranged in parallel and spaced apart, wherein the electromagnetic coil plate and the induction metal heating plate are integrated into one body through an insulating layer; the electromagnetic coil plate has two electrodes; The two output ends of the high-frequency power supply are electrically connected to the two lead-out electrodes of each integrated electromagnetic heating plate; 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; The electromagnetic coil plate is a hollow metal plate formed by physically cutting or punching the metal plate. The hollow metal plate is a continuous rotating or convoluted metal strip, and both ends of the metal strip are electrodes.
2. The distributed electromagnetic heating drying equipment according to claim 1, characterized in that: The cross-sectional width of the metal strip is more than 6 times its thickness.
3. The distributed electromagnetic heating drying equipment according to claim 1, characterized in that: The metal strip is a maze-like spiral strip directly cut 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.
4. The distributed electromagnetic heating drying equipment according to claim 1, characterized in that: An insulating seat is arranged in the heating chamber, and a plurality of electrode springs are arranged on the insulating seat. The electrode springs are electrically connected to the output end of the high-frequency power supply in the equipment chamber, and the lead-out electrodes of the integrated electromagnetic heating plate are in elastic contact with the electrode springs either individually or through a bus.
5. The distributed electromagnetic heating drying equipment according to claim 1, characterized in that: An insulating tube is arranged between the equipment compartment and the heating compartment, the lead-out electrode of the integrated electromagnetic heating plate is electrically connected to the bus, a conductive column is arranged on the bus, the conductive column passes through the insulating tube into the equipment compartment, and is electrically connected to the output end of the high-frequency power supply.
6. The distributed electromagnetic heating drying equipment according to claim 1, characterized in that: A material tray guide rail is arranged on the support frame between the integrated electromagnetic heating plates.
7. The distributed electromagnetic heating drying equipment according to claim 1, characterized in that: The heating chamber is a vacuum chamber or the air pressure inside the chamber is lower than the air pressure outside the chamber; an air extraction pipe and an air inlet pipe are arranged on the heating chamber.
8. The distributed electromagnetic heating drying equipment according to claim 1, characterized in that: A material conveying device is arranged between the integrated electromagnetic heating plates.