Electromagnetic heating heat conduction plate and electromagnetic heating vacuum / freeze drying equipment

Abstract

The utility model discloses an electromagnetic heating heat-conducting plate and electromagnetic heating vacuum / freeze drying equipment. Comprising a cabinet body, and the cabinet body comprises an equipment bin and a vacuum heating bin; a high-frequency power supply is arranged in the equipment bin; a support frame is arranged in the vacuum heating bin; a plurality of sets of integrated electromagnetic heating plates are arranged on the supporting frame at intervals through heating frames, each integrated electromagnetic heating plate at least comprises an electromagnetic coil plate and an induction metal heating plate which are arranged in parallel at intervals, and the electromagnetic coil plates and the induction metal heating plates are combined into a whole through insulating layers and are electrically connected with the high-frequency power supply; a heat conducting plate is arranged on or below the integrated electromagnetic heating plate, and a plurality of flow guide holes are formed in the heat conducting plate. Materials needing to be dried can be placed on the heat conducting plate to be evenly heated in a large area in a vacuum state, and the vacuum drying device has the advantages of being efficient in heat transfer, even in temperature, capable of saving energy, short in drying time, capable of improving quality and the like.

Description

Technical Field

[0001] The utility model relates to an electromagnetic heating vacuum / freeze drying device, which is used for drying food, Chinese medicinal materials, medicines, nuts, chemical materials and other materials that need to be dried. The vacuum mentioned in the utility model means that the air pressure in the vacuum heating chamber is negative pressure. Background Art

[0002] Many materials are temperature sensitive and need to be dried at low temperatures or freeze-dried in a vacuum environment.

[0003] During vacuum drying, due to the thin air, there is no air medium to transfer heat or the heat transfer capacity of the thin gas is reduced. The bottom of the baking tray can only be heated by circulating fluids such as hot water or heat transfer oil flowing through the heating platform, and a circulation system is formed by combining a circulating pump and an expansion tank to transfer heat. Due to the low temperature of hot water (pressure limitation) or the small specific heat capacity of heat transfer oil, the bottom of the baking tray and the heating platform are required to be very flat, and the processing accuracy is particularly high, so the processing cost is high. The temperature of the platform part corresponding to the water / oil inlet end is higher than the temperature of the platform part corresponding to the water / oil outlet end, and the temperature difference is still large, the heating is very uneven, and the drying time is prolonged. At the same time, the total weight of the platform itself and the heat transfer medium (water or oil) is large, the residual heat is large, the preheating time is long, the energy waste is large, and the temperature control cannot be accurate. At the same time, the heat transfer process is very sensitive to foreign matter on the heating platform, which needs to be removed at any time. Cleaning is particularly troublesome, the workload is large, and the use efficiency is reduced. Utility Model Content

[0004] In order to overcome the above-mentioned defects, the purpose of the utility model is to provide an electromagnetic heating vacuum / freeze drying device.

[0005] To achieve the above-mentioned purpose, the electromagnetic heating vacuum / freeze drying equipment of the utility model comprises a cabinet, wherein the cabinet comprises an equipment compartment and a vacuum heating compartment; a high-frequency power supply is arranged in the equipment compartment; a support frame is arranged in the vacuum drying compartment;

[0006] More than one partition frame is arranged on the support frame, an integrated electromagnetic heating plate is arranged on each partition frame, and a heat conducting plate is arranged on the upper side and / or the lower side of the electromagnetic heating plate; wherein at least one flow guide pipe is arranged at intervals in the middle of the heat conducting plate, and each flow guide pipe is formed with a liquid inlet and a liquid outlet on the side wall of the heat conducting plate;

[0007] It also includes a circulating liquid inlet pipe and a circulating liquid outlet pipe;

[0008] The circulating liquid inlet pipe is connected to the liquid inlet of each guide pipe;

[0009] The circulating liquid outlet pipe is connected to the liquid outlet of each guide pipe;

[0010] A circulation pipeline is arranged in the equipment warehouse, and a circulation pump and a liquid storage expansion tank are arranged on the circulation pipeline; the liquid inlet end of the circulation pipeline is connected to the liquid outlet end of the circulation liquid outlet pipe through a pipeline; the liquid outlet end of the circulation pipeline is connected to the liquid inlet end of the circulation liquid inlet pipe through a pipeline;

[0011] 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.

[0012] Furthermore, the integrated electromagnetic heating plate comprises an upper induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, a lower insulating layer, a lower protective plate or a lower induction metal heating plate which are arranged in parallel and tightly combined from top to bottom, and the electromagnetic coil plate has two electrodes.

[0013] Furthermore, the heat conduction plate is composed of an upper heat conduction plate and a lower heat conduction plate arranged opposite to each other, and a plurality of upper guide tube half-height grooves are arranged on the lower side of the upper heat conduction plate; a lower guide tube half-height groove is also correspondingly arranged on the upper side of the lower heat conduction plate; the upper guide tube half-height groove and the lower guide tube half-height groove are combined into a complete guide tube groove; the guide tube is arranged in the guide tube groove, and the heat conduction plate can be one piece or multiple pieces spliced ​​together.

[0014] Furthermore, the heat conducting plate is formed by drilling holes in the whole plate or pre-buried pipes and then casting; it can be one piece or multiple pieces spliced ​​together.

[0015] Furthermore, a heat conducting material is provided between the flow guide pipe and the flow guide pipe groove.

[0016] Furthermore, a corrosion-resistant protective plate or a soft pad is provided on the surface of the heat conducting plate, and a heat conducting material is applied on the contact surface between the heat conducting plate and the protective plate or the soft pad.

[0017] Furthermore, the metal strip is a long maze-like spiral strip directly cut from a metal plate.

[0018] Furthermore, the vacuum heating chamber is a vacuum tunnel chamber; if the heat conducting plate is arranged on the top, a conveyor belt is arranged thereon; if the heat conducting plate is arranged below, a conveyor belt is arranged on the upper induction metal heating plate.

[0019] Furthermore, it includes a heat conduction plate, an induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, and a lower insulating layer arranged in sequence from top to bottom; or an induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, a lower insulating layer, and a heat conduction plate arranged in sequence from top to bottom; the electromagnetic coil plate has two electrodes; wherein at least one flow guide tube is arranged at intervals in the middle of the heat conduction plate, and each flow guide tube is formed with a liquid inlet and a liquid outlet on the side wall of the heat conduction plate.

[0020] Furthermore, the heat conducting plate is an aluminum or copper plate, or an aluminum or copper alloy plate.

[0021] To achieve the above-mentioned purpose, the electromagnetic heating heat conduction plate of the utility model comprises a heat conduction plate, an induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, and a lower insulating layer arranged in sequence from top to bottom; or an induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, a lower insulating layer, and a heat conduction plate arranged in sequence from top to bottom; the electromagnetic coil plate has two electrodes; wherein at least one flow guide tube is arranged at intervals in the middle of the heat conduction plate, and each flow guide tube is formed with a liquid inlet and a liquid outlet on the side wall of the heat conduction plate.

[0022] The utility model sets a heat conducting plate on the upper or lower side of the integrated electromagnetic heating plate, and sets a plurality of flow guide pipes at a certain interval between the upper and lower sides of the heat conducting plate. The flow guide pipes, other pipeline systems, liquid storage expansion tanks and circulation pumps form a liquid circulation system; when the heat conducting plate is set on the upper side, the heat generated by the integrated electromagnetic heating plate is transferred to the heat conducting plate, and the heat conducting plate heats the material tray placed on it; when the heat conducting plate is set on the lower side, the heat generated by the integrated electromagnetic heating plate is directly transferred to the material tray. The heat conducting plate is made of a material with good thermal conductivity and has a thick thickness, so the temperature distribution of the entire plate surface is uniform. Since the weight of the materials in each material tray is difficult to be completely consistent, heat transfer is difficult under a vacuum state, and the material tray with less material may rise abnormally at the end of drying. Therefore, a plurality of flow guide pipes are set at a certain interval between the upper and lower sides of the heat conducting plate, and the flow guide pipes, other pipeline systems, liquid storage expansion tanks and circulation pumps form a liquid circulation system, and the heat of the heat conducting plate with a high temperature is transferred to the heat conducting plate with a low temperature through the circulating liquid, so that the temperature of the entire system is balanced. Since the integrated electromagnetic heating plate has no pressure limit and the power density is evenly distributed, the heat is transferred to the heat conducting plate by automatically raising the temperature locally, which can reduce the processing requirements of the heat conducting plate surface and is no longer sensitive to foreign matter on the surface. The slight difference in temperature of the entire system is achieved through the liquid circulation system. The utility model overcomes the shortcomings of uneven temperature of traditional vacuum / freeze drying, and has the advantages of efficient heat transfer, uniform temperature, energy saving, shortened drying time, and precise temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a schematic structural diagram of the electromagnetic heating vacuum / freeze drying device according to an embodiment of the utility model.

[0024] Figure 2 Shown is a structural diagram of an integrated electromagnetic heating plate and a heat conducting plate.

[0025] Figure 3 Shown is a top view of the integrated electromagnetic heating plate after removing the upper metal induction heating plate.

[0026] Figure 4Shown is a plan view of the electromagnetic coil plate in the integrated electromagnetic heating panel.

[0027] Figure 5 Shown is a structural diagram of a heat conducting plate with a guide tube.

[0028] Figure 6 Shown is a simplified structural diagram of a tunnel-type electromagnetic heating vacuum / freeze drying device with a heat-conducting plate according to an embodiment of the utility model.

[0029] Figure 7 Shown is a simplified structural diagram of a tunnel-type electromagnetic heating vacuum / freeze drying device without a heat conducting plate according to an embodiment of the utility model.

[0030] Figure 8 This is a schematic diagram of the circulating fluid system of the utility model.

[0031] Among them: 1-high frequency conversion unit; 2-primary coil; 3-secondary coil; 4-magnetic core; 5-secondary coil terminal; 6-integrated electromagnetic heating plate lead-out electrode; 7-heating frame longitudinal beam; 8-heating frame cross beam; 9-integrated electromagnetic heating plate; 10-insulator; 11-electrode combination device; 12-heat conducting plate; 13-heat conducting plate guide hole; 14-exhaust pipe; 15-intake pipe; 16-circulating liquid inlet pipe; 17-circulating liquid pipe joint; 18-circulating liquid outlet pipe; 19-circulating liquid branch pipe joint; 20-circulating liquid branch pipe; 2 1-door handle; 22-support frame; 23-heating frame fixing ear; 24-integrated electromagnetic heating plate electrode; 25-integrated electromagnetic heating plate electrode outlet; 26-upper induction metal heating plate; 27-upper insulation layer; 28-electromagnetic coil plate; 29-lower insulation layer; 30-lower protection plate; 31-integrated electromagnetic heating plate side strip; 32-integrated electromagnetic heating plate front strip; 33-integrated electromagnetic heating plate rear strip; 34-guide pipe; 35-tunnel type vacuum chamber; 36-conveyor belt; 37-circulation pump; 38-liquid storage expansion tank. 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 temperature between each layer of heat conducting plate is balanced by the liquid circulation system. Since the integrated electromagnetic heating plate is very thin, the heat conducting plate can be arranged on the upper side or the lower side of the integrated electromagnetic heating plate.

[0037] The utility model discloses an electromagnetic heating vacuum / freeze drying device, which comprises a cabinet body, wherein the cabinet body comprises an equipment compartment and a vacuum heating compartment; a high-frequency power supply is arranged in the equipment compartment; a support frame is arranged in the vacuum heating compartment; more than one partition frame is arranged on the support frame, and the number of the partition frames is set according to needs; for example, it can be 1-20 layers, or more.

[0038] An integrated electromagnetic heating plate is arranged on each partition frame; the integrated electromagnetic heating plate comprises an upper induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, a lower insulating layer, a lower protective plate or a lower induction metal heating plate which are arranged in parallel and tightly combined together, and 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 set of integrated electromagnetic heating plates.

[0039] 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. The hollow metal plate is a continuous rotating or convoluted metal strip, such as Figure 3 to Figure 4 As 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. The width of the metal strip can be designed as needed.

[0040] 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;

[0041] The physical method includes but is not limited to turning, milling, planing, grinding, laser cutting and the like; the chemical method includes but is not limited to chemical etching and the like;

[0042] A heat conducting plate is arranged on the upper side or the lower side of the integrated electromagnetic heating plate. The heat conducting plate can be made of a high thermal conductivity metal material, such as iron, aluminum, copper or alloy. The heat conducting plate can be integrated and cast by drilling or pre-buried pipes, or it can be formed by combining an upper and a lower piece. The heat conducting plate can also be spliced.

[0043] At least one guide pipe is arranged at intervals in the middle of the heat conducting plate. The number of guide pipes can be set as needed. When the heat conducting plate is integrated, it is formed by drilling holes or by casting after pre-buried pipes. When the heat conducting plate is composed of upper and lower pieces, guide grooves can be arranged on opposite sides of the upper and lower heat conducting plates, and guide pipes are arranged in the guide grooves. In order to ensure the speed of heat conduction, a thermal conductive agent is preferably coated between the guide pipe and the guide groove.

[0044] Each flow guide pipe is formed with a liquid inlet and a liquid outlet on the side wall of the heat conducting plate;

[0045] It also includes a circulating liquid inlet pipe and a circulating liquid outlet pipe;

[0046] The circulating liquid inlet pipe is connected to the liquid inlet of each guide pipe;

[0047] The circulating liquid outlet pipe is connected to the liquid outlet of each guide pipe;

[0048] A circulation pipeline is arranged in the equipment warehouse, and a circulation pump 37 and a liquid storage expansion tank 38 are arranged on the circulation pipeline; the liquid inlet end of the circulation pipeline is connected to the liquid outlet end of the circulation liquid outlet pipe through a pipeline; the liquid outlet end of the circulation pipeline is connected to the liquid inlet end of the circulation liquid inlet pipe through a pipeline.

[0049] like Figure 8The above-mentioned guide pipe, circulating liquid inlet pipe and circulating liquid outlet pipe, circulating pipeline, circulating pump 37 and liquid storage expansion tank 38 together form a circulation system.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In the above structure, the electromagnetic coil plate that generates a magnetic field and the upper induction metal heating plate that generates 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 protective plate (or heat conducting plate). When a high-frequency current passes through the electromagnetic coil plate, eddy currents are generated in the upper induction metal heating plate, which causes the upper induction metal heating plate to heat up. At the same time, the electromagnetic coil plate also heats up due to its own resistance, and conducts the heat to the upper induction metal heating plate and the heat conducting plate. However, the insulating layer between the electromagnetic coil plate and the upper induction metal heating plate is very thin, so the temperature difference generated is very small. The eddy current in the induction metal heating plate per unit area is only related to the current of the electromagnetic coil plate closest to it. Of course, the lower protective plate will also heat up. The integrated electromagnetic heating plate is very thin and it is also easy to conduct heat to the heat conducting plate.

[0054] Since the upper insulating layer and the lower insulating layer are 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 induction metal heating plate and the lower protective plate are equivalent to a huge flat plate capacitor.

[0055] The functions of the transformer are: 1) to increase the impedance of the power grid to the upper induction metal heating plate and the lower protection plate to reduce leakage current; 2) to isolate the power grid, ensure safety when the upper or lower insulation layer is damaged, and reduce the requirements and thickness of insulation; 3) to achieve load impedance matching by adjusting the transformation ratio.

[0056] The function of the heat conduction plate is to conduct heat laterally to make the temperature uniform, and to make the temperature between each layer uniform through the circulating fluid.

[0057] like Figure 1As shown, the electromagnetic heating vacuum / freeze drying equipment of the utility model includes a box body, the box body includes an equipment compartment and a vacuum heating compartment; a high-frequency power supply is arranged in the equipment compartment; a support frame is arranged in the vacuum heating compartment, and a plurality of sets 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.

[0058] A heat conduction plate is arranged on the upper or lower side of the integrated electromagnetic heating plate, and a plurality of flow guide pipes are arranged at a certain interval between the upper and lower sides of the heat conduction plate. The flow guide pipe, circulating liquid branch pipe, circulating liquid inlet pipe, circulating liquid outlet pipe and other necessary piping systems, joints, liquid storage expansion tank and circulating pump constitute a liquid circulation system;

[0059] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0060] Example 1

[0061] like Figure 1 As shown, an electromagnetic heating vacuum / freeze-drying device according to an embodiment of the utility model includes a high-frequency conversion unit 1, a primary coil 2, a secondary coil 3, a magnetic core 4, a secondary coil terminal 5, an electrode combining device 11, an integrated electromagnetic heating plate 9, a support frame 22, a door handle 21, a heat conducting plate 12, an exhaust pipe 14, an air intake pipe 15, a liquid circulation system, a shell, a temperature measurement system, a vacuum system, a safety valve and a control system, etc.

[0062] A plurality of sets of integrated electromagnetic heating plates are arranged on a support frame 22 through a heating frame at a certain interval, wherein the heating frame includes: a heating frame longitudinal beam 7, a heating frame cross beam 8 and an integrated electromagnetic heating plate lead-out electrode 6; the integrated electromagnetic heating plate 9 includes an upper induction metal heating plate 26, an upper insulating layer 27, an electromagnetic coil plate 28, a lower insulating layer 29, a lower protective plate 30, an integrated electromagnetic heating plate electrode 24, an integrated electromagnetic heating plate front edge strip 32, an integrated electromagnetic heating plate rear edge strip 33, and an integrated electromagnetic heating plate side edge strip 31, which are closely contacted and stacked; the integrated electromagnetic heating plate electrode 24 is led out through the integrated electromagnetic heating plate electrode outlet 25 of the upper induction metal heating plate 26, and is electrically connected to the integrated electromagnetic heating plate lead-out electrode 6; the insulating layer uses a mica board; the integrated electromagnetic heating plate lead-out electrode 6 is insulated by an insulator 10 On the rear crossbeam of the heating frame; the integrated electromagnetic heating plate lead-out electrode 6 is electrically connected to the secondary coil 3 of the transformer through the electrode combining device 11 and the secondary coil terminal 5, the primary coil 2 of the transformer is electrically connected to the high-frequency conversion unit 1, the primary coil 2 and the secondary coil 3 are installed on the magnetic core 4, and share the magnetic circuit; the heat conduction plate 12 is arranged on the upper induction metal heating plate 26, and is made of aluminum alloy material. A plurality of heat conduction plate guide holes 13 are arranged between the upper and lower parts of the heat conduction plate at a certain interval, and a guide pipe 34 is arranged in the heat conduction plate guide hole 13, which constitutes a liquid circulation system with the circulating liquid branch pipe joint 19, the circulating liquid branch pipe 20, the circulating liquid inlet pipe 16, the circulating liquid pipe joint 17, the circulating liquid outlet pipe 18 and other necessary pipeline systems, liquid storage expansion tanks and circulating pumps; the casing, insulation, temperature measurement system, control system, vacuum system, etc. are all necessary.

[0063] The exhaust pipe 14 is connected to the vacuum system. The vacuum system is generally composed of a water ring vacuum pump and a Roots vacuum pump. The water ring vacuum pump works when the vacuum degree is not high, and the Roots vacuum pump works when the vacuum degree is high. Vacuum valves are respectively arranged on the exhaust pipe 14 and the air inlet pipe 15. The vacuum valve of the exhaust pipe 14 is opened when vacuuming. After drying is completed, the vacuum valve of the air inlet pipe 15 is opened, and air enters. The vacuum heating chamber is at normal pressure. At this time, the door can be opened.

[0064] A necessary safety valve is required. When the vacuum heating chamber is under positive pressure, the safety valve starts to deflate.

[0065] Preferably, a corrosion-resistant protective plate or a soft pad, such as a stainless steel or silicone pad, is provided on the heat-conducting plate. The silicone pad is conducive to heat conduction and also has a protective effect.

[0066] Preferably, a heat conducting sheet, such as silicone cloth, is provided between the integrated electromagnetic heating plate and the heat conducting plate. The silicone cloth can fill the small gap between the integrated electromagnetic heating plate and the heat conducting plate to facilitate heat transfer.

[0067] Example 2

[0068] As a further improvement of the above embodiment, an insulating seat is provided in the vacuum 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;

[0069] Example 3

[0070] As a further improvement of the above embodiment, a flow guide pipe 34 is provided in the heat conduction plate flow guide hole 13 of the heat conduction plate 12, and the flow guide pipe 34 is welded to the circulating liquid branch pipe 20, which has the advantage of simple manufacturing and installation.

[0071] Example 4

[0072] A further improvement of the above embodiment is that, different from Embodiment 1, the heat conducting plate is formed by pre-embedding the flow guide pipe 34 and then casting.

[0073] The working principle of the electromagnetic heating vacuum / freeze drying device of the utility model embodiment is as follows:

[0074] Place the tray with the material on the heat conducting plate 12 and close the door. Start the vacuum system to evacuate the vacuum heating chamber to make the vacuum heating chamber in the required vacuum state. 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. The high-frequency magnetic field induces a high-frequency current in the secondary coil 3. The high-frequency current flows to the electromagnetic coil plate 28, thereby generating eddy currents in the upper induction metal heating plate 26. The eddy currents cause the upper induction metal heating plate 26 to heat up. At the same time, the resistance of the electromagnetic coil plate 28 itself generates heat, and the heat is transferred to the upper induction metal heating plate 26 through the upper insulating layer 27. Since the thickness of the upper insulating layer 27 is very thin, the temperature difference between the electromagnetic coil plate 28 and the upper induction metal heating plate 26 is very small. Of course, the lower protective plate 30 will also heat up. When the temperature of the upper induction metal heating plate 26 rises, the heat is transferred to the heat conducting plate 12 to heat the material tray, so that the moisture of the material in the tray evaporates continuously, and the evaporated water vapor is pumped away by the vacuum pump. This process is repeated until the material is dried. The control system and the temperature measurement system control the drying temperature.

[0075] During the drying process, the liquid circulation system is started to circulate the liquid (such as water or heat transfer oil) through the heat transfer plate flow pipe 34 of the heat transfer plate 12 continuously, and the liquid flowing through each layer of the heat transfer plate is continuously mixed, so that the temperature of each layer of the heat transfer plate 12 is uniform. Since each layer of the heat transfer plate 12 is mainly heated by the integrated electromagnetic heating plate below it, the circulating liquid only balances the temperature difference that may be generated by the different amounts of materials on each layer of the heat transfer plate. Therefore, not too much circulating liquid is needed to achieve uniform temperature of the entire system, which can avoid abnormal temperature rise of the heat transfer plate with less material.

[0076] Since the secondary coil 3 and the primary coil 2 are connected by magnetic field induction coupling, the electromagnetic coil plate 28 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 induction metal heating plate 26 and the lower protective plate 30 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 28 and the thickness of the upper insulating layer 27 and the lower insulating layer 29.

[0077] Since the temperature of the upper induction metal heating plate 26 is not limited by pressure, heat can be conducted and radiated to the material tray by increasing the temperature, and the requirements for the heat conducting plate and the tray are not high, and it is insensitive to foreign matter under the tray.

[0078] Example 5

[0079] Figure 5 This is another embodiment of the utility model. An integrated electromagnetic heating plate is installed in a tunnel-type vacuum chamber 35. A heat conducting plate is arranged on the integrated electromagnetic heating plate. A conveyor belt 36 is closely arranged on the heat conducting plate. It can be one section or multiple sections to form a continuous vacuum / freeze drying device.

[0080] Example 6

[0081] Figure 6 This is another embodiment of the utility model, where an integrated electromagnetic heating plate is installed in a tunnel-type vacuum bin 35, and a conveyor belt 36 is closely arranged above the integrated electromagnetic heating plate, which can be one section or multiple sections. Since the material is in dynamic motion, it is not necessary to balance the temperature of each section, which can greatly reduce the cost.

[0082] The utility model also has other variations, such as arranging a corrosion-resistant protective plate or a soft pad, such as a stainless steel plate or a silicone pad, on the heat-conducting plate. The silicone pad is conducive to heat conduction and also has a protective effect.

[0083] The utility model also has other variations, such as providing a heat conducting sheet, such as silicone cloth, between the integrated electromagnetic heating plate and the heat conducting plate. The silicone cloth can fill the small gap between the integrated electromagnetic heating plate and the heat conducting plate to facilitate heat transfer.

[0084] The utility model has other variations, such as the following protective plate 30 can be made of ferromagnetic material, which has a heating effect, and the temperature of the protective plate 30 is increased, so that it has the ability to radiate heat to the upper part of the material, which can shorten the drying time.

[0085] The present invention also has other variations, such as a heat conducting plate being arranged at the lower side of the integrated electromagnetic heating plate.

[0086] The utility model also has other variations, such as selecting a thicker induction metal heating plate instead of a special heat conducting plate.

[0087] The utility model also has other variations, such as when the temperature is not very sensitive, the heat conducting plate may not be used.

[0088] The utility model also has other variations, such as the heat conducting plate is formed by splicing a plurality of smaller plates, which is easy to manufacture.

[0089] 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.

[0090] 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.

[0091] 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 electromagnetic heating vacuum / freeze drying device, characterized in that: It comprises a cabinet, wherein the cabinet comprises an equipment compartment and a vacuum heating compartment; a high-frequency power supply is arranged in the equipment compartment; and a support frame is arranged in the vacuum drying compartment; More than one partition frame is arranged on the support frame, an integrated electromagnetic heating plate is arranged on each partition frame, and a heat conducting plate is arranged on the upper side and / or the lower side of the electromagnetic heating plate; wherein at least one flow guide pipe is arranged at intervals in the middle of the heat conducting plate, and each flow guide pipe is formed with a liquid inlet and a liquid outlet on the side wall of the heat conducting plate; It also includes a circulating liquid inlet pipe and a circulating liquid outlet pipe; The circulating liquid inlet pipe is connected to the liquid inlet of each guide pipe; The circulating liquid outlet pipe is connected to the liquid outlet of each guide pipe; A circulation pipeline is arranged in the equipment warehouse, and a circulation pump and a liquid storage expansion tank are arranged on the circulation pipeline; the liquid inlet end of the circulation pipeline is connected to the liquid outlet end of the circulation liquid outlet pipe through a pipeline; the liquid outlet end of the circulation pipeline is connected to the liquid inlet end of the circulation liquid inlet pipe through a pipeline; 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.

2. The electromagnetic heating vacuum / freeze drying device according to claim 1, characterized in that: The integrated electromagnetic heating plate comprises an upper induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, a lower insulating layer, a lower protective plate or a lower induction metal heating plate which are arranged in parallel and tightly combined from top to bottom, and the electromagnetic coil plate has two electrodes.

3. The electromagnetic heating vacuum / freeze drying equipment according to claim 1, characterized in that: The heat conduction plate is composed of an upper heat conduction plate and a lower heat conduction plate arranged opposite to each other, and a plurality of upper guide pipe half-height grooves are arranged on the lower side of the upper heat conduction plate; a lower guide pipe half-height groove is also arranged correspondingly on the upper side of the lower heat conduction plate; the upper guide pipe half-height groove and the lower guide pipe half-height groove are combined into a complete guide pipe groove; the guide pipe is arranged in the guide pipe groove; the heat conduction plate is one or more pieces spliced ​​together.

4. The electromagnetic heating vacuum / freeze drying equipment according to claim 1, characterized in that: The heat conducting plate is formed by casting a whole plate or pre-buried pipes; the heat conducting plate is formed by splicing one or more pieces.

5. The electromagnetic heating vacuum / freeze drying equipment according to claim 1, characterized in that: A heat conducting material is arranged between the guide pipe and the guide pipe groove.

6. The electromagnetic heating vacuum / freeze drying equipment according to claim 1, characterized in that: A corrosion-resistant protective plate or a soft pad is arranged on the surface of the heat-conducting plate, and a heat-conducting material is applied on the contact surface between the heat-conducting plate and the protective plate or the soft pad.

7. The electromagnetic heating vacuum / freeze drying equipment according to claim 2, characterized in that: The electromagnetic coil plate is a long maze-like spiral strip directly cut from a metal plate.

8. The electromagnetic heating vacuum / freeze drying equipment according to claim 2, characterized in that: The vacuum heating chamber is a vacuum tunnel chamber; if the heat conducting plate is arranged on the top, a conveyor belt is arranged on it; if the heat conducting plate is arranged on the bottom, a conveyor belt is arranged on the upper induction metal heating plate.

9. An electromagnetic heating heat conducting plate, characterized in that: It comprises a heat conducting plate, an induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, and a lower insulating layer arranged in sequence from top to bottom; or an induction metal heating plate, an upper insulating layer, an electromagnetic coil plate, a lower insulating layer, and a heat conducting plate arranged in sequence from top to bottom; the electromagnetic coil plate has two electrodes; wherein at least one flow guide tube is arranged at intervals in the middle of the heat conducting plate, and each flow guide tube is formed with a liquid inlet and a liquid outlet on the side wall of the heat conducting plate.

10. The electromagnetic heating heat conducting plate according to claim 9, characterized in that: The heat conducting plate is an aluminum or copper plate, or an aluminum or copper alloy plate.

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