Air fryer with electromagnetic heating function and high heat cycle efficiency

Abstract

The utility model provides an air fryer with an electromagnetic heating function and high heat cycle efficiency, and aims to solve the problems of low heat cycle efficiency and low heat energy utilization rate caused by unreasonable layout of an electromagnetic heating device and a hot air fan in a hot air cavity in the air fryer in the prior art. An air fryer with an electromagnetic heating function and high heat cycle efficiency comprises a fryer body provided with a cooking cavity; the air frying furnace end is arranged on the fryer body, and a hot air cavity cover and a cold air cavity cover are arranged on the air frying furnace end; a fan assembly; and the electromagnetic heating assembly comprises an electromagnetic coil assembly arranged on the hot air cavity cover and a heating disc suspended in the hot air cavity, the hot air fan is arranged between the heating disc and the hot air cavity cover, and a heating disc through hole communicated with the air inlet end of the hot air fan and the cooking cavity is formed in the middle of the heating disc. According to the utility model, when the hot air fan works, hot air heats food in the cooking cavity along the circulation path, and the heat circulation efficiency is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of kitchen appliances, and particularly relates to an air fryer with an electromagnetic heating function and high heat circulation efficiency. Background Art

[0002] Currently, some air fryers on the market use electromagnetic heating devices instead of traditional heating tubes. These air fryers energize an electromagnetic coil, generating induction heating on the heating plate. A heat fan then blows the heat from the heating plate into the cooking chamber to cook the food. However, the layout of the electromagnetic heating device and the heat fan within the hot air chamber of existing air fryers is irrational. As a result, when the heat fan is operating, the hot air cannot form an effective hot air circulation path between the hot air chamber and the cooking chamber. This easily generates eddy currents and turbulence in the cooking chamber, resulting in uneven cooking of the food and low thermal energy utilization efficiency. Utility Model Content

[0003] The utility model provides an air fryer with electromagnetic heating function and high heat circulation efficiency, aiming to solve the problems in the prior art of the electromagnetic heating device and the hot air fan in the hot air chamber of the air fryer, which lead to low heat circulation efficiency and low heat energy utilization rate.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] An air fryer with electromagnetic heating function and high heat circulation efficiency, comprising:

[0006] The fryer body is provided with a cooking cavity;

[0007] An air frying burner head is arranged on the fryer body, and is provided with a hot air cavity cover and a cold air cavity cover. A hot air cavity communicating with the cooking cavity is provided in the hot air cavity cover, and a cold air cavity is provided between the hot air cavity cover and the cold air cavity cover;

[0008] a fan assembly, the fan assembly comprising a hot fan disposed in the hot air chamber, a cold fan disposed in the cold air chamber, and a fan motor for driving the hot fan and the cold fan to rotate; and

[0009] An electromagnetic heating assembly, the electromagnetic heating assembly includes an electromagnetic coil assembly arranged on the hot air chamber cover and a heating plate suspended in the hot air chamber, the hot fan is arranged between the heating plate and the hot air chamber cover, and a heating plate through hole connecting the air inlet end of the hot fan and the cooking chamber is provided in the middle of the heating plate, and an air guide channel connecting the air outlet end of the hot fan and the cooking chamber is provided between the heating plate and the inner side wall of the hot air chamber cover; when the hot fan is working, the air blown out from the air outlet end of the hot fan is blown into the cooking chamber from the air guide channel.

[0010] A further solution: the hot air chamber cover includes a heat insulation cover and a shielding cover located on the upper side of the heat insulation cover; the hot air chamber is arranged on the inner side of the heat insulation cover, and the electromagnetic coil assembly is arranged between the heat insulation cover and the shielding cover; the cold air chamber is located between the shielding cover and the cold air chamber cover.

[0011] Based on the above technical solution: the above layout structure is more reasonable, so that the heating plate is suspended in the hot air cavity, and an air guide channel connected to the air outlet end of the hot fan is formed between the heating plate and the heat insulation cover, which facilitates the hot fan to quickly blow the heat emitted by the heating plate into the cooking cavity; the electromagnetic coil assembly is arranged between the heat insulation cover and the shielding cover, and the heat insulation cover plays a role of heat insulation, reducing the heat radiation generated by the heating plate in the hot air cavity to the electromagnetic coil, and when the cold fan in the cold air cavity is working, it can not only dissipate heat to the fan motor, but also dissipate heat to the electromagnetic coil assembly.

[0012] A further solution: the heating plate is located directly below the electromagnetic coil assembly, and the air guide channel is located between the heating plate and the electromagnetic coil assembly.

[0013] Based on the above technical solution: the heating plate is located directly below the electromagnetic coil assembly, so that the two are arranged relative to each other, so that after the electromagnetic coil assembly is energized, the heating plate generates electromagnetic induction heating, and at the same time, the structural layout of the two is utilized to form an air guide channel.

[0014] A further solution: the air guide channel includes a first channel located between the upper surface of the heating plate and the top wall of the heat insulation cover, and a second channel located between the outer edge of the heating plate and the inner side wall of the heat insulation cover.

[0015] Based on the above technical solution: the above setting makes the air outlet end of the hot fan fully connected with the air guide channel in the circumferential direction, and the air guide channel is fully connected with the upper part of the cooking cavity in the circumferential direction. The hot air blown out from the air outlet end of the hot fan can enter the cooking cavity evenly from the circumferential direction through the air guide channel. Not only is the heat circulation efficiency higher, but the hot air can also heat the circumference surrounding the food at the same time, so the food is heated more evenly and tastes better.

[0016] A further solution: the heat fan includes an upper baffle, a lower baffle, and a plurality of fan blades located between the upper baffle and the lower baffle, wherein the plurality of fan blades are arranged around the output shaft of the fan motor; the upper and lower ends of each fan blade are fixedly connected to the upper baffle and the lower baffle respectively;

[0017] The lower baffle is provided with a lower baffle through hole connected to the heating plate through hole; the output shaft of the fan motor is connected to the upper baffle through a bolt.

[0018] Based on the above technical solution: the above setting makes the hot fan a centrifugal fan, the air outlet end of the hot fan is connected to the air guide channel, and the air inlet end of the hot fan is located at the through hole of the lower baffle, thereby forming a hot air circulation path, making the hot air circulation efficiency higher; at the same time, since the lower baffle through hole is provided on the lower baffle, the bolts can be fixedly connected to the output shaft of the motor through the through hole of the lower baffle, which is convenient for users to disassemble the hot fan for cleaning.

[0019] A further solution is that a heat insulation cover through hole extending upward is provided in the middle of the heat insulation cover, the shielding cover covers the upper side of the heat insulation cover through hole, the lower baffle is arranged in the heating plate through hole, and the upper baffle is arranged in the heat insulation cover through hole.

[0020] Based on the above technical solution: by arranging the lower baffle in the through hole of the heating plate and the upper baffle in the through hole of the heat insulation cover, an air guide channel connecting the cooking cavity and the air outlet end of the hot fan is formed between the heating plate and the heat insulation cover, so that the air outlet end of the hot fan and the air guide channel are efficiently connected; the shielding cover can effectively prevent the heat in the hot air cavity from entering the cold air cavity by covering the through hole of the heat insulation cover.

[0021] A further solution is that an annular groove is provided on the upper side of the heat insulation cover, and the electromagnetic coil assembly is arranged in the annular groove.

[0022] Based on the above technical solution: the above arrangement is not only convenient for installing the electromagnetic coil assembly, but also the heat insulation cover plays a role of heat insulation, which can effectively prevent the heat in the hot air cavity from radiating heat to the electromagnetic coil assembly.

[0023] A further solution: the electromagnetic coil assembly includes a coil disk, a coil frame located on the upper side of the coil disk, and several magnetic conductors arranged around the coil frame; the coil frame is provided with several mounting parts around its center, and several of the magnetic conductors are arranged on the mounting parts in a one-to-one correspondence.

[0024] A further solution: the heating plate is square in shape, and the four corners of the heating plate are all arc-shaped transitions.

[0025] Based on the above technical solution: the above setting makes the cooking cavity and the air guide channel fully connected in the circumferential direction, and the hot air blown out from the air outlet of the hot fan can enter the cooking cavity evenly along the air guide channel from the upper circumference surrounding the cooking cavity, thereby heating the food evenly in the circumferential direction. Not only is the heat circulation efficiency higher, but the food is also heated more evenly.

[0026] A further solution is that a plurality of arc-shaped guide plates are provided on the heating plate, and the plurality of guide plates are arranged around the center of the heating plate, and an arc-shaped air guide groove with a diameter gradually increasing from the center to the edge of the heating plate is formed between each two adjacent guide plates.

[0027] Based on the above technical solution: by arranging a guide plate on the heating plate, not only the contact area between the heating plate and the hot air is increased, so that the heat of the heating plate can be quickly taken away by the circulating hot air, thereby improving the efficiency of heat energy utilization, but the air guide groove can also guide the hot air blown out from the air outlet of the hot fan into the cooking cavity, making the hot air circulation smoother.

[0028] The beneficial effects of the utility model are:

[0029] The utility model suspends the heating plate in the electromagnetic heating device in the hot air cavity, the hot fan is arranged between the heating plate and the hot air cavity cover, and a heating plate through hole is provided in the middle of the heating plate, which connects the air inlet end of the hot fan with the cooking cavity; by suspending the heating plate in the hot air cavity, an air guide channel connecting the air outlet end of the hot fan and the cooking cavity is formed between the heating plate and the inner side wall of the hot air cavity cover, and through the above reasonable structural layout, a circulation path of the hot air is formed, so that when the hot fan is working, the hot air blown out from the air outlet end of the hot fan is first blown into the cooking cavity along the air guide channel, and then flows back from the cooking cavity through the heating plate through the through hole to the air inlet end of the hot fan, thereby avoiding turbulence of the hot air in the cooking cavity, and allowing the hot air to heat the food in the cooking cavity along the circulation path, so that the heat circulation efficiency is higher, thereby improving the heat energy utilization efficiency.

[0030] By arranging the electromagnetic coil assembly on the hot air chamber cover and setting a cold air chamber between the hot air chamber cover and the cold air chamber cover, the cold fan in the cold air chamber can not only dissipate heat for the fan motor but also dissipate heat for the electromagnetic coil assembly when working, thereby preventing the electromagnetic coil assembly from overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a schematic diagram of the cross-sectional structure of the present utility model.

[0033] Figure 2 It is a schematic diagram of the exploded structure of the shielding cover, the heat insulation cover, the electromagnetic heating device and the heating plate.

[0034] Figure 3 It is a schematic diagram of the exploded structure of the fan motor, hot fan and cold fan.

[0035] Figure 4 It is a structural diagram of the heating plate.

[0036] Figure 5 It is a structural schematic diagram of a heating plate with a guide plate.

[0037] Description of the numbers in the figure:

[0038] 1-fryer body; 11-cooking chamber; 2-air fryer burner; 21-cold air chamber cover; 211-cold fan; 212-fan motor; 213-cold air chamber; 22-heat insulation cover; 221-heat insulation cover through hole; 222-annular groove; 223-hot air chamber; 23-shielding cover; 3-hot fan; 31-upper baffle; 32-lower baffle; 321-lower baffle through hole; 33-bolt; 4-heating plate; 41-guide plate; 42-air guide groove; 43-heating plate through hole; 5-air guide channel; 6-coil plate; 7-coil frame; 8-magnetic conductor. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] like Figures 1 to 3 As shown, this embodiment provides an air fryer with electromagnetic heating function and high heat circulation efficiency, including:

[0041] The fryer body 1 is provided with a cooking cavity 11;

[0042] An air frying burner 2 is provided on the fryer body 1 and is provided with a hot air cavity cover and a cold air cavity cover 21. A hot air cavity 223 communicating with the cooking cavity 11 is provided in the hot air cavity cover, and a cold air cavity 213 is provided between the hot air cavity cover and the cold air cavity cover 21.

[0043] a fan assembly, the fan assembly comprising a hot fan 3 disposed in the hot air chamber 223, a cold fan 211 disposed in the cold air chamber 213, and a fan motor 212 for driving the hot fan 3 and the cold fan 211 to rotate, that is, the hot fan 3 and the cold fan 211 are coaxially disposed on the output shaft of the fan motor 212; and

[0044] An electromagnetic heating component, which includes an electromagnetic coil component arranged on the hot air chamber cover and a heating plate 4 suspended in the hot air chamber 223. The hot fan 3 is arranged between the heating plate 4 and the hot air chamber cover, and a heating plate through hole 43 is provided in the middle of the heating plate 4 for connecting the air inlet end of the hot fan 3 with the cooking chamber 11. An air guide channel 5 is provided between the heating plate 4 and the inner side wall of the hot air chamber cover for connecting the air outlet end of the hot fan 3 with the cooking chamber 11. When the hot fan 3 is working, the air blown out from the air outlet end of the hot fan 3 blows downward from the air guide channel 5 into the cooking chamber 11, and then flows back upward from the cooking chamber 11 through the heating plate through hole 43 to the air inlet end of the hot fan 3.

[0045] Specifically, the heating plate 4 is disposed directly below the electromagnetic coil assembly, and the air guide channel is located between the heating plate and the electromagnetic coil assembly. When the electromagnetic coil assembly is energized, the heating plate 4 generates electromagnetic induction heating. The heating plate 4 can be suspended in the hot air cavity 223 via a connector. A certain distance is provided between the upper side of the heating plate 4 and the top wall of the hot air cavity cover. A certain distance is provided between the circumference of the heating plate 4 and the inner side wall of the hot air cavity cover, thereby forming an air guide channel 5. The hot fan 3 is a centrifugal fan, with its air outlet facing the air guide channel 5. Hot air is blown into the cooking cavity 11 through the air guide channel 5. The hot air then flows back from the cooking cavity 11 through the heating plate through-hole 43 to the air inlet end of the hot fan 3, thereby forming a hot air circulation path. The hot air circulates more efficiently along the preset path, and the heat utilization rate is higher.

[0046] In some embodiments, such as Figure 1 and Figure 2 As shown, the hot air chamber cover includes a heat insulation cover 22 and a shielding cover 23 located above the heat insulation cover 22; the hot air chamber 223 is located inside the heat insulation cover 22, and the electromagnetic coil assembly is located between the heat insulation cover 22 and the shielding cover 23; the cold air chamber 213 is located between the shielding cover 23 and the cold air chamber cover 21. The upper end of the heat insulation cover 22 is fixedly connected to the shielding cover 23. The heat insulation cover 22 can separate the hot air chamber 223 from the electromagnetic coil assembly, thereby reducing the heat radiation received by the electromagnetic coil assembly. In addition, when the cold fan 211 is in operation, it can not only dissipate heat from the fan motor 212, but also from the electromagnetic coil assembly. The hot fan 3, the heat insulation cover 22, and the heating plate 4 are coaxially arranged, that is, the hot fan 3 is arranged in the center between the heat insulation cover 22 and the heating plate 4, which is conducive to the hot air blown out from the air outlet end of the hot fan 3 to enter the air guide channel 5 evenly from the circumference, and then enter the cooking cavity 11 evenly from the air guide channel 5, thereby heating the food simultaneously in the circumference and making it heated evenly.

[0047] In some embodiments, such as Figure 1 、 Figure 4 and Figure 5 As shown, depending on the shape of the heat shield 22, the heating plate 4 can be square, with all four corners having arc-shaped transitions. The shape of the heating plate 4 can also be circular, etc., as needed. The heating plate 4 can be suspended in the hot air chamber 223 via a plurality of connectors arranged around its circumference.

[0048] To further increase the heat dissipation area of ​​the heating plate 4 and its contact area with the circulating hot air, the heating plate 4 is provided with several curved guide vanes 41. These guide vanes 41 are arranged around the center of the heating plate 4, and between each pair of adjacent guide vanes 41, a curved air guide groove 42 is formed, with the diameter gradually increasing from the center to the edge of the heating plate. Specifically, the guide vanes 41 can be arranged in an arc shape and extend from the center to the edge of the heating plate 4. The diameter of the air guide groove gradually increases towards the edge, ensuring smoother circulation of the hot air.

[0049] In some embodiments, such as Figure 1 and Figure 3 As shown, the hot fan 3 includes an upper baffle 31, a lower baffle 32 and a plurality of fan blades located between the upper baffle 31 and the lower baffle 32, and the plurality of fan blades are arranged around the output shaft of the fan motor 212; the upper and lower ends of each fan blade are fixedly connected to the upper baffle 31 and the lower baffle 32 respectively; specifically, the fan blades are arc-shaped and extend from the middle of the upper baffle 31 to its outer edge.

[0050] The lower baffle plate 32 is provided with a lower baffle through hole 321 which is connected to the heating plate through hole 43. The hot air passes from the cooking chamber 11 upward through the heating plate through hole 43 and then enters the hot fan 3 through the lower baffle through hole 321. The lower baffle through hole 321 is the air inlet end of the hot fan 3. The output shaft of the fan motor 212 is connected to the upper baffle plate 31 through a bolt 33, and the bolt 33 is fixed to the output shaft of the fan motor 212 from bottom to top through the lower baffle through hole 321. Specifically, the bolt 33 is threadedly connected to the output shaft of the fan motor 212. Therefore, when disassembling, the bolt 33 is unscrewed to remove the hot fan 3 from the output shaft of the fan motor 212, and it can be cleaned, etc.

[0051] In some embodiments, such as Figure 1 and Figure 2As shown, the middle part of the heat insulation cover 22 is provided with a heat insulation cover through hole 221 extending upward, the shield cover 23 covers the upper side of the heat insulation cover through hole 221, the lower baffle 32 is arranged in the heating plate through hole 43, and the upper baffle 31 is arranged in the heat insulation cover through hole 221. Specifically, the output shaft of the fan motor 212 passes downward through the shield cover 23 and is connected to the hot fan 3. The diameters of the heat insulation cover through hole 221 and the heating plate through hole 43 are set to be slightly larger than the diameter of the hot fan 3, so that the hot fan 3 can rotate, and at the same time, the hot air blown out from the air outlet of the hot fan 3 can smoothly enter the air guide channel 5. The air guide channel 5 includes a first channel located between the upper surface of the heating plate 4 and the top wall of the heat insulation cover 22, and a second channel located between the outer edge of the heating plate 4 and the inner wall of the heat insulation cover 22. Specifically, the air outlet end of the hot fan 3 is fully connected with the air guide channel 5 in the circumferential direction, and the upper part of the cooking cavity 11 is fully connected with the air guide channel 5 in the circumferential direction, which not only makes the heat circulation efficiency higher, but also the hot air surrounds the circumference of the upper part of the cooking cavity 11 and blows downward into the cooking cavity 11 at the same time, which can heat the food in the circumference at the same time, making the food heated more evenly and taste better.

[0052] In some embodiments, such as Figure 1 and Figure 2 As shown, to facilitate installation of the electromagnetic coil assembly, an annular groove 222 is provided on the upper side of the heat shield 22, and the electromagnetic coil assembly is disposed within the annular groove 222. The electromagnetic coil assembly comprises a coil disk 6, a coil frame 7 located above the coil disk 6, and a plurality of magnetic conductors 8 disposed around the coil frame 7. The coil frame 7 has a plurality of mounting portions disposed around its center, and the plurality of magnetic conductors 8 are disposed one-to-one on the mounting portions.

[0053] Working principle description:

[0054] When the electromagnetic coil assembly is energized, the heating plate 4 generates electromagnetic induction heat, causing the hot fan 3 to operate. Hot air blown from the air outlet of the hot fan 3 enters the cooking cavity 11 through the air guide 5, thereby heating the food. The hot air then flows from the cooking cavity 11 through the heating plate through-holes 43 and the lower baffle through-holes 321 and enters the hot fan 3. When the cooling fan 211 is in operation, it not only dissipates heat from the fan motor 212, but also from the electromagnetic coil assembly.

[0055] The present invention is not limited to the above optional implementation methods. Under the premise of not conflicting with each other, the various solutions can be combined arbitrarily. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in their shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the scope of protection of the present invention.

Claims

1. An air fryer with electromagnetic heating function and high heat circulation efficiency, characterized in that: include: The fryer body is provided with a cooking cavity; An air frying burner head is arranged on the fryer body, and is provided with a hot air cavity cover and a cold air cavity cover. A hot air cavity communicating with the cooking cavity is provided in the hot air cavity cover, and a cold air cavity is provided between the hot air cavity cover and the cold air cavity cover; a fan assembly, the fan assembly comprising a hot fan disposed in the hot air chamber, a cold fan disposed in the cold air chamber, and a fan motor for driving the hot fan and the cold fan to rotate; and An electromagnetic heating component, the electromagnetic heating component includes an electromagnetic coil component arranged on the hot air chamber cover and a heating plate suspended in the hot air chamber, the hot fan is arranged between the heating plate and the hot air chamber cover, and a heating plate through hole connecting the air inlet end of the hot fan and the cooking chamber is provided in the middle of the heating plate, and an air guide channel connecting the air outlet end of the hot fan and the cooking chamber is provided between the heating plate and the inner side wall of the hot air chamber cover; when the hot fan is working, the air blown out from the air outlet end of the hot fan is blown into the cooking chamber from the air guide channel.

2. The air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 1, characterized in that: The hot air chamber cover includes a heat insulation cover and a shielding cover located on the upper side of the heat insulation cover; the hot air chamber is arranged on the inner side of the heat insulation cover, and the electromagnetic coil assembly is arranged between the heat insulation cover and the shielding cover; the cold air chamber is located between the shielding cover and the cold air chamber cover.

3. An air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 1 or 2, characterized in that: The heating plate is located directly below the electromagnetic coil assembly, and the air guide channel is located between the heating plate and the electromagnetic coil assembly.

4. The air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 2, characterized in that: The air guide channel includes a first channel located between the upper surface of the heating plate and the top wall of the heat insulation cover, and a second channel located between the outer edge of the heating plate and the inner side wall of the heat insulation cover.

5. The air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 2, characterized in that: The heat fan includes an upper baffle, a lower baffle, and a plurality of fan blades located between the upper baffle and the lower baffle, wherein the plurality of fan blades are arranged around the output shaft of the fan motor; the upper and lower ends of each fan blade are fixedly connected to the upper baffle and the lower baffle respectively; The lower baffle is provided with a lower baffle through hole connected to the heating plate through hole; the output shaft of the fan motor is connected to the upper baffle through a bolt.

6. The air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 5, characterized in that: The middle of the heat insulation cover is provided with a heat insulation cover through hole extending upward, the shielding cover covers the upper side of the heat insulation cover through hole, the lower baffle is arranged in the heating plate through hole, and the upper baffle is arranged in the heat insulation cover through hole.

7. The air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 2, characterized in that: An annular groove is provided on the upper side of the heat insulation cover, and the electromagnetic coil assembly is arranged in the annular groove.

8. The air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 7, characterized in that: The electromagnetic coil assembly includes a coil disk, a coil frame located on the upper side of the coil disk, and several magnetic conductors arranged around the coil frame; the coil frame is provided with several mounting parts around its center, and several magnetic conductors are arranged on the mounting parts in a one-to-one correspondence.

9. The air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 1, characterized in that: The heating plate is in a square shape, and the four corners of the heating plate are all arc-shaped transitions.

10. The air fryer with electromagnetic heating function and high heat circulation efficiency according to claim 1, characterized in that: The heating plate is provided with a plurality of arc-shaped guide plates, which are arranged around the center of the heating plate, and an arc-shaped air guide groove with a diameter gradually increasing from the center to the edge of the heating plate is formed between each two adjacent guide plates.

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