Internal heating type electromagnetic oven

Abstract

The utility model discloses an internal heating type electromagnetic oven, which comprises an oven body and an electromagnetic heating component arranged in the oven body, the electromagnetic heating component comprises a central tube arranged in the oven body, an electromagnetic coil wound on the central tube and a heating cylinder sleeved outside the electromagnetic coil, and the heating cylinder is made of electromagnetic induction materials. And the central tube is made of a non-magnetic material. After the electromagnetic coil is powered on, the heating cylinder emits heat, and therefore food in the oven body is heated in an electromagnetic heating mode. Due to the fact that the heating cylinder is located in the center of the furnace cavity in the furnace body, the heating cylinder serves as a heat source, the temperature of the heating cylinder is the highest, and the heating cylinder is surrounded by the furnace cavity, most heat emitted by the heating cylinder can be used for heating the furnace cavity, only the portions, connected with the furnace body, of the two ends of the heating cylinder have little heat loss, and therefore the heat utilization efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of baking machinery technology, and in particular to an internal heating electromagnetic oven. Background Technology

[0002] Currently, the mainstream oven technologies on the market primarily employ two heating methods: natural gas combustion heating and resistance heating elements. When using natural gas, the combustion process produces a series of toxic and harmful substances, polluting not only the environment but also directly contaminating the food being baked. While resistance heating elements address safety concerns to some extent, their low electro-thermal conversion efficiency (typically only 60%–80%) results in wasted energy and low overall heat utilization in these ovens.

[0003] Currently, there are also ovens that use electromagnetic heating, which can greatly improve the efficiency of electrothermal conversion. The electromagnetic heating elements in these ovens are usually located at the bottom or on the walls, so heat dissipates from the walls or bottom into the oven cavity during heating. Additionally, this heating method causes some heat generated by the electromagnetic heating elements to leak outwards from the oven walls, thus reducing heat utilization efficiency.

[0004] Patent CN212912934U discloses an electromagnetic grill, including a base, an electromagnetic heating grill module, and an electromagnetic heating frying pan module. The electromagnetic heating grill module includes an electromagnetic heating grill core, a first heating cylinder, a second heating cylinder, and a middle plate. The electromagnetic heating frying pan module includes an electromagnetic heating frying pan core, a first frying pan heating plate, a second frying pan heating plate, a middle plate, a metal plate, and a cooktop shell. This grill, with its electromagnetic heating grill module and electromagnetic heating frying pan module, can grill and fry food, and can heat food in each module simultaneously, resulting in high efficiency. However, because the electromagnetic heating grill core used for heating is mounted on the base, a significant amount of heat generated by the electromagnetic heating grill core is transferred to the base and then dissipates downwards, leading to waste.

[0005] Patent CN208837692U discloses an electromagnetic induction heating oven, including a cabinet and an electromagnetic induction heating hot air module installed on the cabinet for heating the internal space of the cabinet. The electromagnetic induction heating hot air module includes metal baffles for moving to form airflow and a first motor for driving the movement of the baffles; it also includes an electromagnetic heating device for providing an alternating magnetic field to the baffles, causing them to generate a corresponding alternating current and thus heat up. Since the electromagnetic induction heating hot air module is located on the side wall of the cabinet, a lot of heat will inevitably dissipate outward through the side wall of the cabinet. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an internal heating electromagnetic oven, which solves the problem that the current electromagnetic ovens have reduced heat utilization efficiency because the electromagnetic heating element is set on the oven wall or bottom, causing the heat emitted by the electromagnetic heating element to leak out from the oven wall.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] An internal heating electromagnetic oven includes an oven body and an electromagnetic heating assembly disposed within the oven body. The electromagnetic heating assembly includes a central tube disposed within the oven body, an electromagnetic coil wound around the central tube, and a heating cylinder sleeved around the electromagnetic coil. The heating cylinder is made of an electromagnetic induction material, and the central tube is made of a non-magnetic material.

[0009] Furthermore, there is a gap between the electromagnetic coil and the heating cylinder, which serves as an air duct. Two covers are connected to the outside of the furnace body, and each cover is fixedly connected with a ventilation pipe. Both covers contain air chambers, and the air chambers of the two covers correspond to the two ends of the air duct. The two ends of the air duct are connected to the corresponding air chambers, and / or the two ends of the central pipe are connected to the corresponding air chambers.

[0010] Furthermore, the furnace body is a vertical cylindrical shape, and the heating cylinder and the central tube are both fixedly connected to the center of the furnace body in a vertical direction.

[0011] Furthermore, an oil receiving tray is rotatably connected to the bottom of the furnace body, the oil receiving tray is sleeved outside the heating cylinder, a hanging rack is placed on the oil receiving tray, and a first motor for driving the tray to rotate is provided on the furnace body.

[0012] Furthermore, a screw conveyor is fixedly connected inside the furnace body, the screw conveyor is wound around the heating cylinder, and openings are provided on the side wall of the furnace body at positions corresponding to both ends of the screw conveyor.

[0013] Furthermore, an oil receiving tray is placed at the bottom of the furnace body, and at least one layer of baffles is provided inside the furnace body.

[0014] Furthermore, the furnace body is a horizontal cylindrical shape, the central tube is fixedly connected to the heating cylinder, the heating cylinder is rotatably connected to the furnace body, the furnace body is provided with support legs for supporting the furnace body, and the furnace body is provided with a second motor for driving its rotation.

[0015] Furthermore, the furnace body has a heat insulation layer on the inner side wall and / or the inner wall of the heating cylinder, a temperature sensor is installed inside the furnace body, a furnace door is installed on the furnace body, and ventilation holes are opened on the furnace body.

[0016] Furthermore, it also includes an electromagnetic heating frequency converter, which is electrically connected to an electromagnetic coil.

[0017] The positive effects of this utility model are:

[0018] 1. This utility model includes a furnace body with a central tube inside. An electromagnetic coil is wound around the central tube, and a heating element made of electromagnetic induction material is fitted over the electromagnetic coil. When the electromagnetic coil is energized, the heating element heats up, thus heating the food inside the furnace using electromagnetic heating. Since the heating element is located in the center of the furnace cavity, it acts as the heat source and has the highest temperature. Because the heating element is surrounded by the furnace cavity, most of the heat emitted by the heating element is used to heat the furnace cavity, with only a very small amount of heat loss at the ends of the heating element connected to the furnace body, thereby improving heat utilization efficiency.

[0019] 2. The heating element has an insulation layer inside, and an air duct is located between the insulation layer and the electromagnetic coil. Air is introduced into the air duct and the central tube to cool the electromagnetic coil, preventing it from overheating and shortening its lifespan or even burning out. At the same time, the heating power can be increased when using the same electromagnetic coil. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of Example 1;

[0021] Figure 2 This is a structural schematic diagram of Example 2;

[0022] Figure 3 This is a structural schematic diagram of Example 3;

[0023] Figure 4 This is a structural schematic diagram of Example 4;

[0024] In the picture:

[0025] 1. Support leg; 2. Furnace body; 3. Mounting plate; 4. Temperature sensor; 5. Partition plate; 6. Ventilation hole; 7. End cover; 8. Ventilation pipe; 9. Furnace door; 10. Handle; 11. Furnace cavity; 12. Oil receiving tray; 13. Air chamber; 14. Central tube; 15. Electromagnetic coil; 16. Heating cylinder; 17. Screw conveyor; 18. Opening; 19. Hanger; 20. Driven gear; 21. Second motor; 22. Drive gear; 23. First motor; 24. Gear ring; 25. Air duct. Detailed Implementation

[0026] Example 1

[0027] like Figure 1As shown, an internal heating electromagnetic oven includes a cylindrical oven body 2 and an electromagnetic heating assembly disposed within the oven body 2. The electromagnetic heating assembly includes a central tube 14 disposed within the oven body 2, an electromagnetic coil 15 wound around the central tube 14, and a heating cylinder 16 sleeved around the electromagnetic coil 15. The heating cylinder 16 is made of an electromagnetic induction material (e.g., iron), and the central tube 14 is made of a non-magnetic material (e.g., epoxy resin). An electromagnetic heating frequency converter is disposed outside the oven body 2, and the electromagnetic heating frequency converter is electrically connected to the electromagnetic coil 15.

[0028] There is a gap between the electromagnetic coil 15 and the heating element 16, which serves as an air duct 25. Two covers are connected to the outside of the furnace body 2. Each cover includes an annular mounting plate 3 fixedly connected to the outside of the furnace body 2 and a bowl-shaped end cap 7 that is fastened to the mounting plate 3. The end caps 7 are welded to their respective mounting plates 3. A ventilation pipe 8 is fixedly connected to each end cap 7. The two ends of the central tube 14 are respectively secured to the corresponding end caps 7. An air chamber 13 is located between the end cap 7 and the mounting plate 3 of each cover. The end cap 7 has a through hole in its center. The mounting plate 3 also has through holes evenly distributed circumferentially at positions corresponding to the air duct 15, thus allowing the two ends of the air duct 25 to communicate with the corresponding air chambers 13. The upper and lower ends of the central tube 14 are also connected to the corresponding air chambers 13. The upper and lower ends of the heating element 16 are fixedly connected to the furnace body 2. The lead wire of the electromagnetic coil 15 passes through the mounting plate 3 and the end cap 7 in sequence and is then connected to the electromagnetic heating frequency converter.

[0029] The furnace body 2 is a vertical cylindrical shape, and the heating element 16 and the central tube 14 are both vertically fixed to the center of the furnace body 2. A furnace door 9 is provided on the side wall of the furnace body 2, and a handle 10 is provided on the furnace door 9. An oil receiving tray 12 is placed at the bottom inside the furnace body 2, and two layers of perforated partitions 5 are provided inside the furnace body 2. Insulation layers are provided on the inner walls of the side walls of the furnace body 2 and the inner walls of the heating element 16. A temperature sensor 4 is provided inside the furnace body 2. A vent 6 is opened at the top of the furnace body 2, and a support leg 1 is provided at the bottom of the furnace body 2. To facilitate the insertion of the oil receiving tray 12 into the furnace cavity 11 from the furnace door 9, the oil receiving tray 12 can be made in a fan shape, and then assembled into a circle after being placed into the furnace cavity 11.

[0030] The working process of this utility model is as follows:

[0031] Pull handle 10 to open oven door 9. Place the food to be baked on partition 5. The electromagnetic heating frequency converter operates, energizing electromagnetic coil 15. A changing magnetic field is formed within electromagnetic coil 15, which in turn generates eddy currents in heating cylinder 16, causing heating cylinder 16 to heat up. The heat emitted by heating cylinder 16 is dissipated into oven cavity 11 inside oven body 2, heating the food placed on partition 5. Vent hole 6 allows water vapor and smoke from the baking process to be discharged.

[0032] Because this invention uses electromagnetic heating to heat food placed on the partition 5, the electrothermal conversion efficiency is very high. The efficiency typically exceeds 90%, thus saving electrical energy and improving energy efficiency. This invention avoids the use of flammable and explosive natural gas or liquefied petroleum gas, and does not produce open flames during the heating process, greatly reducing the risk of fire or explosion and making it safer to use. At the same time, electromagnetic heating itself does not produce harmful gases or substances, thus ensuring the safety of the baked food and a friendly working environment.

[0033] By combining the temperature signal fed back by the temperature sensor, the heating power and the on / off power of the electromagnetic coil 15 can be precisely controlled by the electromagnetic heating frequency converter, so as to achieve precise control of the temperature inside the oven cavity 11, ensuring that the food is heated evenly during the baking process and avoiding over-baking or under-baking.

[0034] In addition, during the heating process, ventilation is provided through the ventilation pipe 8 to the air duct 25 and the central pipe 14 to cool the electromagnetic coil 15, so as to avoid the electromagnetic coil 15 from overheating and having a short lifespan or even burning out.

[0035] Since the heating cylinder 16 is located in the center of the furnace cavity 11 and is surrounded by the furnace cavity 11, most of the heat emitted by the heating cylinder 16 will be used to heat the furnace cavity 11. Only a very small portion at both ends of the heating cylinder 16 will lose heat. Therefore, the heat loss is minimal, which can further improve heating efficiency and reduce energy consumption.

[0036] Example 2

[0037] like Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that:

[0038] The oil receiving tray 12 is an integral ring, fitted around the heating cylinder 16. A gear ring 24 is fixedly connected to the bottom surface of the oil receiving tray 12. Bullseye bearings are evenly distributed along the circumference of the bottom of the gear ring 24, and the bullseye bearings abut against the bottom surface of the furnace cavity 11. Rollers are distributed along the inner circle of the gear ring 24 on the bottom surface of the furnace body 2. The rollers are supported on the inner circle of the gear ring 24, and all rollers are rotatably connected to the furnace body 2. A first motor 23 is fixedly connected to the bottom of the furnace body 2. The output shaft of the first motor 23 passes through the furnace body 2, and a gear fixedly connected to the output shaft meshes on the gear ring 24. A hanger 19 is placed on the oil receiving tray 12.

[0039] In addition, in this embodiment, the furnace door 9 is no longer located on the side wall of the furnace body 2, but is located on the top of the furnace body 2. The furnace door 9 is ring-shaped and covers the top of the furnace body 2. After opening the furnace door 9, the oil receiving tray 12 and the hanging rack 19 can be taken out and placed.

[0040] In this embodiment, poultry such as chicken and duck, or other foods, can be roasted by hanging. The first motor 23 drives the gear ring 24 to rotate, which in turn drives the oil receiving tray 12 and the hanging rack 19 to rotate, so that the suspended food rotates around the heating cylinder 16 in the oven cavity 11, thereby making the food on the hanging rack 19 evenly roasted.

[0041] Example 3

[0042] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that:

[0043] The furnace body 2 no longer has a furnace door 9. A screw conveyor 17 is fixedly connected inside the furnace body 2. The screw conveyor 17 is a chain plate type screw conveyor. The screw conveyor 17 is wound around the heating cylinder 16. Openings 18 are provided on the side wall of the furnace body 2 at positions corresponding to both ends of the screw conveyor 17.

[0044] The screw conveyor 17 has two conveying directions: from bottom to top or from top to bottom. Food is put into the screw conveyor 17 through the opening 18 at one end, and the baked food is sent out from the other end of the screw conveyor 17, thereby realizing continuous baking of food and improving production efficiency.

[0045] Example 4

[0046] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that:

[0047] The furnace body 2 is a horizontal cylindrical shape. The central tube 14 and the heating cylinder 16 are both horizontally arranged. The furnace door 9 is located on the right side of the furnace body 2. The furnace body 9 and the heating cylinder 16 are rotatably connected through each other. The mounting plate 3 is fixedly connected to the heating cylinder 16. The support legs 1 are fixedly connected to the outside of the two end caps 7, thereby supporting the furnace body 9. A ring-shaped driven gear 20 is fixedly connected to the left side of the furnace body 2. The driven gear 20 is sleeved on the left end cap 7. A second motor 21 is fixedly connected to the left end cap 7. A driving gear 22 is fixedly connected to the output shaft of the second motor 21. The driving gear 22 meshes with the driven gear 20.

[0048] When the second motor 21 rotates, it drives the furnace body 2 to rotate through the driving gear 22 and the driven gear 20, which can roast sunflower seeds, peanuts and other roasted goods in the furnace cavity 11.

[0049] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. An internal heating electromagnetic oven, comprising an oven body (2) and an electromagnetic heating assembly disposed within the oven body (2), characterized in that, The electromagnetic heating assembly includes a central tube (14) disposed in the furnace body (2), an electromagnetic coil (15) wound around the central tube (14), and a heating cylinder (16) sleeved around the electromagnetic coil (15). The heating cylinder (16) is made of electromagnetic induction material, and the central tube (14) is made of non-magnetic material.

2. The internal heating electromagnetic oven according to claim 1, characterized in that, There is a gap between the electromagnetic coil (15) and the heating cylinder (16), which is a duct (25). Two covers are connected to the outside of the furnace body (2). Each cover is fixedly connected with a ventilation pipe (8). Both covers contain air chambers (13). The air chambers (13) of the two covers correspond to the two ends of the duct (25). The two ends of the duct (25) are connected to the corresponding air chambers (13), and / or the two ends of the central tube (14) are connected to the corresponding air chambers (13).

3. The internal heating electromagnetic oven according to claim 1, characterized in that, The furnace body (2) is a vertical cylindrical shape, and the heating cylinder (16) and the central tube (14) are both fixedly connected to the center of the furnace body (2) in a vertical direction.

4. The internal heating electromagnetic oven according to claim 3, characterized in that, The furnace body (2) has an oil receiving tray (12) rotatably connected to the bottom. The oil receiving tray (12) is sleeved on the heating cylinder (16). A hanging rack (19) is placed on the oil receiving tray (12). The furnace body (2) is equipped with a first motor (23) for driving the tray to rotate.

5. An internal heating electromagnetic oven according to claim 1, characterized in that, A screw conveyor (17) is fixedly connected inside the furnace body (2). The screw conveyor (17) is wound around the heating cylinder (16). Openings (18) are provided on the side wall of the furnace body (2) at positions corresponding to both ends of the screw conveyor (17).

6. The internal heating electromagnetic oven according to claim 1, characterized in that, The furnace body (2) has an oil receiving tray (12) at the bottom, and the furnace body (2) has at least one layer of partition (5).

7. An internal heating electromagnetic oven according to claim 1, characterized in that, The furnace body (2) is a horizontal cylindrical shape. The central tube (14) is fixedly connected to the heating cylinder (16). The heating cylinder (16) is rotatably connected to the furnace body (2). The furnace body (2) is provided with a support leg (1) for supporting the furnace body (2). The furnace body (2) is provided with a second motor (21) for driving its rotation.

8. An internal heating electromagnetic oven according to claim 1, characterized in that, The furnace body (2) has a heat insulation layer on the inner side wall and / or the inner wall of the heating cylinder (16). The furnace body (2) has a temperature sensor (4) inside. The furnace body (2) has a furnace door (9) and a ventilation hole (6) on it.

9. An internal heating electromagnetic oven according to claim 1, characterized in that, It also includes an electromagnetic heating frequency converter, which is electrically connected to an electromagnetic coil (15).

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