Air fryer

Abstract

The utility model provides an air fryer which comprises a shell, a fryer body and an auxiliary heating device, the shell comprises a lower machine body and an upper machine body, the fryer shell comprises the lower machine body and the upper machine body, the fryer body is arranged on the lower machine body, the fryer body is provided with a magnetic conduction fryer wall, the fryer wall defines a cooking cavity, and the auxiliary heating device is arranged corresponding to the fryer wall so as to heat the fryer body when powered on. According to the air fryer provided by the embodiment of the invention, the auxiliary heating device is electrified to be magnetically coupled with the fryer wall to heat the fryer wall, and the fryer wall generates heat and heats food. The air fryer can heat food in the cooking cavity through the fryer wall and the hot air flow at the same time, and the cooking speed of the air fryer is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to an air fryer. BACKGROUND

[0002] With the pursuit of healthy diet by users, air fryers gradually appear in people's field of vision. The air fryer evaporates the moisture on the surface of the food through the high-speed circulating hot air flow, so that the food can achieve the effect of frying without oil, thereby reducing the intake of oil and making the food healthier. In addition, the air fryer does not need to use oil and water, is simple and convenient to operate, and has a very fast cooking speed.

[0003] The main heating of the air fryer is to rely on the air flow driven by the fan located at the upper part, and the air flow passes through the heating device to generate hot air flow. The heat conduction effect of air medium is lower than that of metal and other materials, and the cooking effect of hot air flow on food is slow. The heating mode of the air fryer is single, the heating efficiency is low, and the application range is limited. CONTENT OF THE INVENTION

[0004] The embodiment of the present application provides an air fryer to at least partially improve the above technical problems.

[0005] In one aspect, the embodiment of the present application provides an air fryer, which comprises a shell, a pot body and an auxiliary heating device. The shell comprises a lower body and an upper body, and the pot body is arranged in the lower body. The pot body has a magnetically conductive pot wall, and the pot wall forms a cooking cavity. The auxiliary heating device is arranged corresponding to the pot wall to heat the pot body when powered on.

[0006] In one embodiment, the air fryer further comprises a fan and a main heating device. The fan has magnetic conductivity and is arranged in the upper body and is used to form air flow circulation in the cooking cavity. The main heating device is arranged opposite to the fan and is used to heat the fan blades.

[0007] In one embodiment, the main heating device is arranged corresponding to the fan blades and surrounds the axis of the fan to heat the fan blades when powered on.

[0008] In one embodiment, the air fryer further comprises a heating panel, which is arranged in the upper body and located between the main heating device, the auxiliary heating device and the pot body.

[0009] In one embodiment, the pot body has a side wall, and the auxiliary heating device is arranged around the outer circle of the side wall.

[0010] In an embodiment, when the air fryer starts cooking, the main heating device and the auxiliary heating device are controlled to be turned on alternately according to the driving signal, and when the air fryer stops cooking, the main heating device and the auxiliary heating device are controlled to be turned off.

[0011] In an embodiment, the air fryer further comprises a control circuit, the control circuit comprising a first driving module, a first capacitor, a second driving module and a second capacitor, the first driving module being electrically connected to the second driving module to form a first branch, the first capacitor being electrically connected to the second capacitor to form a second branch, two ends of the first branch being electrically connected to two ends of the second branch, one end of the auxiliary heating device being electrically connected between the first driving module and the second driving module, and the other end being electrically connected between the first capacitor and the second capacitor.

[0012] In an embodiment, the control circuit is configured to control the first driving module and the second driving module to be turned on alternately according to the driving signal when the air fryer starts cooking, and to control the first driving module and the second driving module to be turned off when the air fryer stops cooking.

[0013] In an embodiment, the air fryer further comprises a driving circuit, the driving circuit comprising a third driving module, a third capacitor, a fourth driving module and a fourth capacitor, the third driving module being electrically connected to the fourth driving module to form a third branch, the third capacitor being electrically connected to the fourth capacitor to form a fourth branch, two ends of the third branch being electrically connected to two ends of the fourth branch, one end of the main heating device being electrically connected between the third driving module and the fourth driving module, and the other end being electrically connected between the third capacitor and the fourth capacitor.

[0014] The air fryer provided by the embodiments of the present application can heat food in the cooking cavity through the pot wall and the hot air flow at the same time, thereby improving the cooking rate of the air fryer. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0016] Figure 1 A structural schematic diagram of an air fryer according to an embodiment of the present application is shown in FIG. 1.

[0017] Figure 2 A structural schematic diagram of another air fryer according to an embodiment of the present application is shown in FIG. 2.

[0018] Figure 3A control circuit and a driving circuit provided by an embodiment of the present application.

[0019] Fig. 1 is a structural schematic diagram of a control circuit and a driving circuit according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work fall within the scope of protection of the present application.

[0021] In the present application, unless otherwise explicitly specified or limited, the terms “mounting”, “connecting”, “fixing” and the like should be understood in a broad sense. For example, it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection, electrical connection; it can be direct connection, indirect connection through an intermediate medium, or internal connection of two elements, or it can be surface contact or surface contact connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0022] In addition, the terms “first”, “second”, and the like are only used for distinguishing description, and cannot be understood as specific or special. The description of the terms “some embodiments”, “other embodiments”, and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0023] Embodiments

[0024] An air fryer 100 is provided in embodiments of the present application, please refer to Figure 1 The air fryer 100 can be an air fryer or the like, and the air fryer can evaporate the moisture on the surface of food such as vegetables through a high-speed circulating hot air flow, so as to achieve the effect of fryer cooking without oil.

[0025] Please refer to Figure 2 The air fryer 100 can include a shell 10, a pot body 20, a heating panel 30, a fan 40, and an auxiliary heating device 60. The pot body 20 is detachably assembled in the shell 10, that is, the pot body 20 can be selectively placed in or taken out of the shell 10. The fan 40 is arranged on the upper body 12 of the shell 10, and the fan 40 is arranged opposite to the cooking cavity 21 of the pot body 20. The auxiliary heating device 60 can be arranged on the heating panel 30 and correspondingly arranged with the fan blade 42 of the fan 40. The auxiliary heating device 60 is correspondingly arranged with the pot body 20.

[0026] The magnetic property of the pot wall is used in cooperation with the auxiliary heating element to improve the heating efficiency and realize 360° heating of the food, thereby effectively improving the heating effect. At the same time, since the heat storage and heat conduction of metal are relatively strong, the pot wall can maintain a relatively high temperature and continuously transfer heat to the food.

[0027] In some embodiments, the auxiliary heating device is an electromagnetic element.

[0028] Specifically, please refer to Figure 1 and Figure 2 The shell 10 can be made of metal material, which has good heat dissipation and reduces the influence of internal heat on the components of the shell 10, thereby ensuring the use safety of the air fryer 100. The metal shell has high strength and long service life, which ensures the use safety of the components inside the air fryer 100 and reduces the influence of external vibration or impact.

[0029] The lower body 11 and the upper body 12 form an inner cavity therebetween. The lower body 11 and the upper body 12 are detachably connected to facilitate subsequent separate replacement and reduce maintenance costs. In one embodiment, the pot body 20 is detachably arranged in the lower body 11, and the pot body 20 has a cooking cavity 21. The upper body 12 is used to close the cooking cavity 21. In another embodiment, the shell 10 further includes a first opening, and the first opening communicates with the inner cavity. The pot body 20 is detachably accommodated in the inner cavity, and the pot body 20 is placed in the inner cavity through the first opening.

[0030] The pot body 20 can be used to hold food to be cooked. In an embodiment, the pot body 20 has a pot wall 22 and a bottom 23, which are connected to each other. The bottom 23 is used to hold food, and the pot wall 22 can be formed around the bottom 23 to form a cooking cavity 21. The pot wall 22 can be integrally formed with the bottom 23 or connected by welding, etc. In the embodiment, the pot wall 22 is a magnetic pot wall, which can be made of a magnetic material, such as copper, etc., and the surface thereof can be provided with a non-stick coating. Specifically, the pot body 20 can also be made of stainless steel. The stainless steel pot body has strong rust prevention and good corrosion resistance, and the pot body 20 made of stainless steel is also more durable and easy to clean. The pot body 20 can also be made of aluminum alloy. The aluminum alloy pot body 20 is light in weight and has good heat conduction effect, and can quickly conduct heat, which is suitable for short-time cooking. The pot body 20 can also be made of carbon steel. The carbon steel pot body 20 has high weight resistance, wear resistance and corrosion resistance, and can adapt to more cooking requirements and occasions. The surface of the pot body 20 can also be coated with an artificial coating. The coating is very smooth, which can make the fryer easier to clean and facilitate cooking, and also reduce unnecessary oil use.

[0031] In the embodiment, the pot body 20 can also be provided with a basket (not shown in the figure), which can be a kitchen utensil accessory for baking food inside the air fryer 100. The basket can be made of food-grade aluminum alloy and has different specifications and shapes to adapt to different food and baking requirements. The bottom of the pot body 20 has a protruding structure. When the basket is placed in the cooking cavity 21, the bottom of the basket can abut against the protruding structure to suspend the basket. The food to be cooked is placed on the surface of the basket facing the fan 40. The basket can be used to cook various foods in the air fryer 100, so that the surface of the food is impacted by the hot air flow, making it golden and crispy. Compared with the bottom wall of the pot body 20 having a protrusion, the basket can provide a flat placement plane, on which the food to be cooked can be placed, which is convenient for food placement and avoids mutual stacking of food.

[0032] The heating panel 30 is arranged on the upper body. The heating panel 30 can isolate oil. Please continue to refer to Figure 2 .

[0033] In the present embodiment, the air fryer can further comprise a fan 40 and a main heating device 50, the main heating device 50 is arranged on the upper body, and the auxiliary heating device 60 is arranged in the shell 10 and is arranged in a spaced manner with the main heating device 50, and the fan 40 is used to form air circulation in the cooking cavity 21. Specifically, the fan 40 can comprise a driving device 41 and a fan blade 42, the driving device 41 can comprise a driving shaft 411, and the fan blade 42 can be a magnet conductor such as stainless steel, copper, aluminum alloy and the like, so that the fan blade 42 can be subjected to the action of the surrounding magnetic field. The driving device 41 is arranged in the top shell, and the driving shaft 411 of the driving device 41 extends towards the direction close to the pot body 20, the fan blade 42 is installed on the driving shaft 411, and the driving shaft 411 drives the fan blade 42 to form an air flow, the air flow transfers heat to the food, the food is heated to be cooked, and the air fryer 100 can complete cooking.

[0034] The fan 40 has magnetic conductivity and can be coupled with the main heating device 50, the main heating device 50 is arranged opposite to the fan 40 and is used to heat the fan blade of the fan 40. Avoiding the condensation of oil and the like on the fan blade, at the same time, a heat source is formed from above, the auxiliary heating device 60 forms a heat source below, different heating effects are achieved, the cooking mode of the air fryer is enriched, and the application range of the air fryer is widened.

[0035] The driving device 41 in the present embodiment can adopt a direct-current brushless motor, which is a direct-current motor using electronic commutation. Compared with a traditional alternating-current motor, the direct-current brushless motor has the following advantages:

[0036] Firstly, the direct-current brushless motor has higher energy efficiency ratio: since current reversal adjustment through a traditional commutator is not needed, the direct-current brushless motor can realize the stopping and starting of the motor in a shorter time and has lower energy consumption, so it has higher energy efficiency ratio. Secondly, the direct-current brushless motor has longer service life: since there is no friction material (such as carbon brush) in the motor, the motor has smaller friction loss during operation and has longer service life. Thirdly, the direct-current brushless motor has smaller noise: since the motor has smaller internal friction, the motor has lower noise. Finally, the direct-current brushless motor has wide speed regulation range: the speed regulation range of the direct-current brushless motor is relatively wide, which can adapt to different loads and working conditions.

[0037] It can be understood that, within a normal power range, the power size of the fan 40 determines the number of revolutions of the driving device 41. The power size of the fan 40 can be changed to adjust the speed of the fan 40. In this way, the flow rate of the air flow in the pot body 20 can be changed, the internal heat circulation flow rate can be changed, and the cooking effect of the air fryer 100 can be changed.

[0038] In the present embodiment, please refer to Figure 2 and Figure 3The auxiliary heating device 60 is arranged corresponding to the pot wall 22 and surrounds the axis of the fan 40 to heat the pot body 20 when powered. Further, the auxiliary heating device 60 can include a first coil 62. The first coil 62 is powered and the power current is alternating current to generate an alternating magnetic field. The pot body 20 is located in the alternating magnetic field, and the pot body 20 generates eddy current to generate heat for the pot body 20. The first coil 62 is arranged corresponding to the pot wall 22 on the heating panel 30 and surrounds the axis of the fan 40 in a multi-turn structure, which can be distributed along the axis of the fan blade 42 towards the edge of the fan blade 42. The specific number of turns of the first coil 62 can be selected and designed according to the implementation effect, and the implementation is not limited.

[0039] Since the first coil 62 heats the pot wall 22, the heated area of the end of the pot wall 22 close to the first coil 62 is small and the distance is relatively far, and the heating energy efficiency is reduced. The distance between the first coil 62 and the pot body 20 in the embodiment (as shown by L1) can be less than 30mm. The distance can be the minimum distance between the first coil 62 and the end of the pot wall 22 close to the upper body 12. The distance between the first coil 62 and the pot body 20 can be avoided to be too large to affect the magnetic coupling between the first coil 62 and the pot body 20, improve the heating effect of the first coil 62 on the pot wall 22, and enhance the heating energy efficiency of the first coil 62. Figure 2

[0040] In the embodiment, the pot body 20 also has a flange wall arranged on the pot wall 22 of the pot body 20 and outwardly folded, and the flange wall is at least partially arranged parallel to the auxiliary heating device 60. When the auxiliary heating device 60 is heated, the flange wall corresponds to the auxiliary heating device 60, so that the heating efficiency is higher. At the same time, the flange wall can also be used as a handle of the pot body 20, which is convenient for users to take.

[0041] In the embodiment, please refer to Figure 2 and Figure 3 The main heating device 50 is used to heat the fan blade 42 of the fan 40. The main heating device 50 can be magnetically coupled with the fan blade 42 through an alternating magnetic field. The fan blade 42 in the rotating process passes through the alternating magnetic field, and the fan blade 42 generates eddy current to generate heat for the fan blade 42. The air flow driven by the fan blade 42 can absorb the heat on the fan blade 42 to become a hot air flow, and the hot air flow can heat food.

[0042] ​The main heating device 50 corresponds to the fan blade 42 and surrounds the axis of the fan 40 to heat the fan blade 42 when powered. Specifically, the main heating device 50 can include a second coil 51, which is powered and has an alternating current to generate an alternating magnetic field. The second coil 51 is arranged on the heating panel 30 and surrounds the axis of the fan 40 in a multi-turn structure corresponding to the fan blade 42, which can be distributed along the axis of the fan blade 42 towards the edge of the fan blade 42. The specific number of turns of the second coil 51 can be selected and designed according to the implementation effect, which is not limited in the embodiment. The second coil 51 can heat the fan blade 42 when powered. The main heating device 50 generates an alternating magnetic field through the second coil 51, and the fan blade 42 of the fan 40 moves internally under the action of the alternating magnetic field, so that it is quickly heated itself, and then heats the surrounding air. While heating the surrounding air, it can also drive the heated air to form hot air, which can improve the heat exchange efficiency of the fan 40 and the air. The arrangement of the second coil 51 around the axis of the fan 40 can ensure that the fan blade 42 of the fan 40 can be heated by the second coil 51, and also facilitate the arrangement of the second coil 51, and simplify the structure of the main heating device 50.

[0043] The heating panel 30 is arranged on the upper body and located between the main heating device 50 and the auxiliary heating device 60 and the pot body 20. The heating panel 30 can play a role in isolating grease. The main heating device 50 and the auxiliary heating device 60 can be directly fixed to the pot body 20. The fixing methods include but are not limited to fastener connection, welding, etc. The embodiment does not limit the fixing method of the main heating device 50 and the auxiliary heating device 60.

[0044] In the embodiment, please continue to refer to Figure 2 When the air fryer 100 starts cooking, a driving signal is received. The driving signal can be a signal emitted by the built-in program of the air fryer 100, or it can be an external signal received by the air fryer 100, which is not limited in the embodiment. According to the driving signal, the main heating device 50 and the auxiliary heating device 60 are controlled to be turned on alternately. The air fryer 100 can achieve different cooking effects, avoid the situation of burnt pot when only heating the pot body 20, and avoid the situation that only hot air flow can cause the food to be cooked too dry, so that the user's use experience is not good. Therefore, the method of alternately heating is used to cook the food to be cooked.

[0045] In addition, when the air fryer 100 stops cooking, the main heating device 50 and the auxiliary heating device 60 are controlled to be turned off. According to the driving signal or the signal emitted by the timer or other devices, the main heating device 50 and the auxiliary heating device 60 are controlled to be turned off, and the fan 40 is controlled to be turned off synchronously, so that the air fryer 100 stops heating, and the situation of burning or burnt pot of the internal food to be cooked is avoided.

[0046] In an embodiment, the air fryer 100 further comprises a control circuit 61, which can be used to control the auxiliary heating device 60 to switch the heating state, so that the air fryer 100 can achieve multiple different heating effects.

[0047] Please refer to Figure 3 The control circuit 61 can include a first drive module 611, a second drive module 612, a first capacitor 613, and a second capacitor 614. The first drive module 611 is electrically connected to the second drive module 612 to form a first branch, and the first capacitor 613 is electrically connected to the second capacitor 614 to form a second branch. The two ends of the first branch are electrically connected to the two ends of the second branch, that is, the first branch can be arranged in parallel with the second branch. One end of the auxiliary heating device 60 is electrically connected between the first drive module 611 and the second drive module 612, and the other end is electrically connected between the first capacitor 613 and the second capacitor 614.

[0048] The first coil 62 can heat the pot 20 when energized. Specifically, the first coil 62 forms an alternating magnetic field when connected to alternating current, and the internal molecules of the pot 20 move under the action of the alternating magnetic field, so that the pot 20 is rapidly heated. The heat of the pot 20 can heat the food, so that the food can be smoothly cooked.

[0049] The first drive module 611 and / or the second drive module 612 can be an insulated gate bipolar transistor (IGBT) or the like. The first drive module 611 and the second drive module 612 can both control the conduction and disconnection of the current, and can achieve fine control of the current, voltage, and frequency of the circuit by controlling the conduction and disconnection of the first drive module 611 and the second drive module 612.

[0050] The first capacitor 613 and / or the second capacitor 614 can be an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, or a ceramic capacitor, etc. Specifically, the aluminum electrolytic capacitor is made by winding the water-absorbing paper soaked with paste-like electrolyte between two aluminum foils, and the thin oxide film serves as the dielectric. The aluminum electrolytic capacitor has large capacity and can withstand large pulsating current. The tantalum electrolytic capacitor has good storage, long service life, small capacity error, and small size. The ceramic capacitor has high dielectric constant, low dielectric loss, good frequency characteristics, and good stability.

[0051] In addition, the first capacitor 613 and / or the second capacitor 614 can also be a mica capacitor, a polystyrene capacitor, a polypropylene capacitor, or a polytetrafluoroethylene capacitor, etc. Each type of capacitor has its own unique characteristics and application scenarios, and needs to be selected and designed according to actual needs.

[0052] Please refer toFigure 3 The control circuit 61 is configured to control the first driving module 611 and the second driving module 612 to be turned on alternately according to a driving signal when the air fryer 100 starts cooking. The driving signal can include a first driving signal and a second driving signal, the first driving signal being transmitted to the first driving module 611, and the second driving signal being transmitted to the second driving module 612. The first driving signal and the second driving signal can be a rectangular wave existing in a positive half cycle or a negative half cycle, or both the positive half cycle and the negative half cycle, which is not limited in the embodiment. The first driving signal and the second driving signal appear or disappear periodically. The first driving module 611 turns on the first branch when the first driving signal is obtained, and turns off the first branch when the first driving signal is not obtained. The second driving module 612 turns on the first branch when the second driving signal is obtained, and turns off the first branch when the second driving signal is not obtained. Because the periodic first driving signal and the second driving signal appear alternately, that is, the control circuit 61 can only receive one of the first driving signal and the second driving signal at the same time, the first driving module 611 and the second driving module 612 can be turned on alternately. By turning on and off the first branch according to the first driving signal and the second driving signal through the first driving module 611 and the second driving module 612, the frequency of the current passing through the first coil 62 is adjusted.

[0053] In addition, please refer to Figure 3 The main heating device 50 can further include a driving circuit 52, which can be the same as or different from the control circuit 61 of the auxiliary heating device 60, which is not limited in the embodiment. The driving circuit 52 can include a third driving module 521, a fourth driving module 522, a third capacitor 523, and a fourth capacitor 524. The third driving module 521 is electrically connected to the fourth driving module 522 to form a third branch, and the third capacitor 523 is electrically connected to the fourth capacitor 524 to form a fourth branch. The two ends of the third branch are electrically connected to the two ends of the fourth branch, that is, the third branch can be arranged in parallel with the fourth branch. One end of the main heating device 50 is electrically connected between the third driving module 521 and the fourth driving module 522, and the other end is electrically connected between the third capacitor 523 and the fourth capacitor 524, that is, one end of the second coil 51 is electrically connected between the third driving module 521 and the fourth driving module 522, and the other end is electrically connected between the third capacitor 523 and the fourth capacitor 524.

[0054] The second coil 51 can heat the fan blade 42 when energized. Specifically, the second coil 51 forms an alternating magnetic field when connected to alternating current, and the fan blade 42 moves its own internal molecules under the action of the alternating magnetic field, so that it is rapidly heated. The fan 40 generates a hot air flow, and the heat of the hot air flow can heat the food, so that the food can be cooked smoothly.

[0055] The third driving module 521 and / or the fourth driving module 522 can be an insulated gate bipolar transistor (IGBT) or the like. The third driving module 521 and the fourth driving module 522 can both control the conduction and disconnection of the current, and the fine control of the current, voltage, and frequency of the circuit can be achieved by controlling the conduction and disconnection of the third driving module 521 and the fourth driving module 522.

[0056] The third capacitor 523 and / or the fourth capacitor 524 can be an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, or a ceramic capacitor, etc. Specifically, the aluminum electrolytic capacitor is a capacitor with a thin oxide film as a dielectric, which is formed by winding two aluminum foils with a water-absorbing paper soaked in paste-like electrolyte sandwiched between them. The aluminum electrolytic capacitor has a large capacity and can withstand large pulsating current. The tantalum electrolytic capacitor has good storage properties, long service life, small capacity error, and small size. The ceramic capacitor has high dielectric constant, low dielectric loss, good frequency characteristics, and good stability.

[0057] In addition, the third capacitor 523 and / or the fourth capacitor 524 can also be a mica capacitor, a polystyrene capacitor, a polypropylene capacitor, or a polytetrafluoroethylene capacitor, etc. Each type of capacitor has its unique characteristics and application scenarios, and needs to be selected and designed according to actual needs.

[0058] Please refer to Figure 3 The driving circuit 52 is configured to control the third driving module 521 and the fourth driving module 522 to be opened alternately according to a driving signal when the air fryer 100 starts cooking. The driving signal can include a third driving signal and a fourth driving signal, the third driving signal can be transmitted to the third driving module 521, and the fourth driving signal can be transmitted to the fourth driving module 522. The third driving signal and the fourth driving signal can be a rectangular wave existing in a positive half cycle or a negative half cycle, or both a positive half cycle and a negative half cycle, which is not limited in the embodiment. The third driving signal and the fourth driving signal appear or disappear periodically. The third driving module 521 turns on the third branch when the third driving signal is obtained, and turns off the third branch when the third driving signal is not obtained. The fourth driving module 522 turns on the third branch when the fourth driving signal is obtained,

[0059] The fourth driving module 522 is configured to disconnect the third branch when the fourth driving signal is not acquired. Since the third driving signal and the fourth driving signal are alternately present in a periodic manner, i.e., the driving circuit 52 can only receive one of the third driving signal and the fourth driving signal at the same time, the third driving module 521 and the fourth driving module 522 are alternately turned on. The third driving module 521 and the fourth driving module 522 are configured to adjust the frequency of the current passing through the second coil 51 by turning on and off the third branch according to the third driving signal and the fourth driving signal.

[0060] Further, the control circuit 61 can turn off the main heating device 50, and the driving circuit 52 can turn off the auxiliary heating device 60. Further, the control circuit 61 can cut off the current passing through the first coil 62 to turn off the auxiliary heating device 60, i.e., stop the heating operation of the pot body 20. The driving circuit 52 can cut off the current passing through the second coil 51 to turn off the main heating device 50, i.e., stop the heating operation of the fan blade 42. When the main heating device 50 is turned off, the air fryer 100 can be synchronously turned off, so as to avoid the heat being dissipated with the airflow of the fan 40 and avoid wasting energy.

[0061] It can be understood that the driving circuit 52 can be the same as the control circuit 61, and the working principles of the two can also be the same. For the convenience of understanding, the working principle is introduced by taking the control circuit 61 as an example. Please refer to Figure 3 , which is as follows:

[0062] When the cooking is not started, neither the first driving module 611 nor the second driving module 612 is turned on, the voltage of the second node (indicated as D2 in Figure 3 ) and the third node (indicated as D3 in Figure 3 ) is the same, and no potential difference is formed at the two ends of the first coil 62, and no current is transmitted in the first coil 62. The cooking stage can be described in four stages. In the first stage, the first driving module 611 receives the first driving signal, the first driving module 611 is turned on, the potential of the first node (indicated as D1 in Figure 3 ) is higher than that of the second node and the third node, the current flows out of the first node and flows to the third node along the second node. The first coil 62 has a current flowing from the first end to the second end. In the second stage, under the control of the first driving signal, the first driving module 611 is disconnected, and the current between the second node and the third node continues to be transmitted until the potentials of the two nodes are the same. In the third stage, under the control of the second driving signal, the second driving module 612 is turned on. Since the fourth node (indicated as D4 in Figure 3In the fourth stage, under the control of the second driving signal, the second driving module 612 is turned off, and the current between the second node and the third node continues to flow until the potentials of the two nodes are the same. Between the first stage and the fourth stage, the current direction of the current flowing in the first coil 62 changes. The cycle is repeated, and the current flowing in the first coil 62 is an alternating current.

[0063] When the air fryer 100 stops cooking, the control first driving module 611 and the second driving module 612 are turned off, that is, neither of the first driving module 611 and the second driving module 612 is turned on. The voltages of the second node and the third node are the same, and no potential difference is formed across the two ends of the first coil 62, and no current flows in the first coil 62.

[0064] In an embodiment, in order to ensure the heating effect of the first coil 62 and the second coil 51, it is necessary to increase the heating power of the first coil 62 and the second coil 51. In the present embodiment, please refer to Figure 2 Under the condition of a frequency of 25 kHz and a voltage of 1 V, the resistance value of the first coil 62 and / or the second coil 51 can be greater than 0.75Ω. According to Ohm's law I = V / R, under the given voltage condition, the first coil 62 and / or the second coil 51 need to obtain greater power, and higher resistance is needed to limit the current, so as to avoid excessive heat loss.

[0065] In the present embodiment, please refer to Figure 2 The heating panel 30 is arranged on the upper body 12, and the heating panel 30 can be used to limit the heating range and guide the airflow to flow. The heating panel 30 can be a microcrystalline panel, which has excellent properties such as heat resistance, wear resistance, corrosion resistance, and thermal shock resistance. The heating panel 30 can separate the cooking cavity 21 from the main heating device 50 and the auxiliary heating device 60, so as to avoid the internal heat and water vapor from affecting the normal use of the main heating device 50 and the auxiliary heating device 60. The heating panel 30 can also separate the driving device 41 and the fan blade 42, so as to ensure that the fan blade 42 can generate airflow circulation in the cooking cavity 21, and also avoid the internal heat and water vapor from affecting the operation of the driving device 41.

[0066] In a more specific embodiment, please refer to Figure 3 and Figure 2The heating panel 30 comprises a first area 31 and a second area 32, the second area 32 can be substantially circular, and the second area 32 corresponds to the fan blade 42. The first area 31 is arranged outside the second area 32, and the first area 31 can be a substantially annular structure, and the first area 31 corresponds to the pot wall 22. The auxiliary heating device 60 can be arranged in the first area 31, that is, the first coil 62 is arranged in the first area 31, and the alternating magnetic field of the first coil 62 acts on the pot wall 22 of the pot body 20. The main heating device 50 can be arranged in the second area 32, that is, the second coil 51 is arranged in the second area 32, and the alternating magnetic field of the second coil 51 acts on the pot wall 22 of the pot body 20. The air fryer 100 can simultaneously perform hot air heating and pot body 20 heating, improve the heating rate, and increase the cooking effect.

[0067] Please refer to Figure 2 The first area 31 is provided with a through hole 311 penetrating through the heating panel 30, the driving shaft 411 is arranged in the through hole 311, and the fan blade 42 is mounted on the driving shaft 411 and located on the side of the heating panel 30 away from the second coil 51. The fan blade 42 can be arranged on the driving shaft 411 and rotate coaxially, and the fan blade 42 can generate air flow in the cooking cavity 21 under the action of the driving shaft 411. The fan 40 can form air flow circulation in the cooking cavity 21. Wherein, the diameter of the driving shaft 411 can be slightly smaller than the hole diameter of the through hole 311, so that the driving shaft 411 can be smoothly arranged out of the through hole 311, to ensure that the driving shaft 411 can be smoothly rotated in the through hole 311, and also can avoid heat escaping from the through hole 311, to ensure the use rate of energy.

[0068] Preferably, the through hole 311 is arranged on the heating panel 30, and can be arranged at the center of the heating panel 30. For example, the heating panel 30 can be circular, and the axis of the through hole 311 and the axis of the heating panel 30 coincide with each other, so that the distance from the driving shaft 411 arranged on the through hole 311 to each part of the edge of the heating panel 30 is the same. The heating panel 30 can be provided with a larger size fan blade 42, thereby increasing the action area of the fan 40, and thereby generating a larger air flow range.

[0069] In this embodiment, please refer to Figure 3 and ​, the commercial power is alternating current with a voltage of 220V and a frequency of 50Hz. The commercial power cannot meet the use standard of the air fryer 100. The control circuit 61 in the embodiment further includes a first conversion module 615, which can be electrically connected to the circuit of the commercial power. The commercial power can be converted into low-voltage direct current through the conversion of the first conversion module 615, and the voltage value can be selected and designed according to the specific implementation requirements. The embodiment does not make any limitation. Specifically, the first conversion module 615 can include a rectifier bridge stack and a voltage stabilizing circuit. The sinusoidal alternating current can be converted into direct current with constant voltage through the two, so as to be converted by the first driving module 611 and the second driving module 612 subsequently, for example, converted into square wave current by the driving module, and then the first coil 62 can conduct current to heat the pot body 20.

[0070] It can be understood that, in order to ensure the use requirements of the second coil 51, the driving circuit 52 of the main heating device 50 can also include a second conversion module 525. The second conversion module 525 of the main heating device 50 can include a rectifier bridge stack and a voltage stabilizing circuit. The sinusoidal alternating current can be converted into direct current with constant voltage through the second conversion module 525 of the main heating device 50. Subsequently, the third driving module 521 and the fourth driving module 522 can be converted, and then the second coil 51 can conduct current to heat the fan 40.

[0071] The air fryer 100 provided by the embodiment of the present application can heat the fan blades 42 of the fan 40 through the main heating device 50, the fan blades 42 are driven to generate hot air flow, and the hot air flow circulates in the cooking cavity 21 to heat the food. The auxiliary heating device 60 is powered and magnetically coupled with the pot wall 22 to heat the pot wall 22, and the pot wall 22 generates heat to heat the food. The air fryer 100 can heat the food in the cooking cavity 21 through the pot wall 22 and the hot air flow at the same time, thereby improving the cooking rate of the air fryer 100. In addition, the main heating device 50 and the auxiliary heating device 60 are controlled separately to heat, so as to realize different heating effects, enrich the cooking methods of the air fryer 100, and broaden the application range of the air fryer 100.

[0072] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An air fryer characterized in that, The air fryer comprises: a housing comprising a lower body and an upper body; a pot body arranged in the lower body, the pot body having a magnetically conductive pot wall enclosing a cooking cavity; a secondary heating device arranged corresponding to the pot wall to heat the pot body when powered.

2. The air fryer according to claim 1, characterized in that, The air fryer further comprises: a fan having magnetic conductivity and arranged in the upper body, and used to form air circulation in the cooking cavity; a primary heating device arranged opposite to the fan and used to heat the fan blades.

3. The air fryer according to claim 2, characterized in that The primary heating device is arranged corresponding to the fan blades and surrounds the axis of the fan to heat the fan blades when powered. The secondary heating device is arranged outside the primary heating device.

4. The air fryer according to claim 3, characterized in that The air fryer further comprises a heating panel arranged between the primary heating device, the secondary heating device, and the pot body.

5. The air fryer of claim 1, wherein, The pot body has a following wall arranged on the pot wall of the pot body, and the following wall is at least partially arranged parallel to the secondary heating device.

6. The air fryer of claim 1, wherein, The pot body has a pot wall, and the secondary heating device is arranged outside the pot wall.

7. An air fryer according to any one of claims 2 to 4, wherein, When the air fryer starts cooking, the primary heating device and the secondary heating device are controlled to be alternately turned on according to a driving signal, and when the air fryer stops cooking, the primary heating device and the secondary heating device are controlled to be turned off.

8. An air fryer according to any one of claims 1 to 6, wherein, The air fryer further comprises a control circuit comprising a first driving module, a first capacitor, a second driving module, and a second capacitor, the first driving module is electrically connected to the second driving module to form a first branch, the first capacitor is electrically connected to the second capacitor to form a second branch, two ends of the first branch are electrically connected to two ends of the second branch, one end of the secondary heating device is electrically connected between the first driving module and the second driving module, and the other end is electrically connected between the first capacitor and the second capacitor.

9. The air fryer of claim 8, wherein, The control circuit is used to control the first driving module and the second driving module to be alternately turned on according to a driving signal when the air fryer starts cooking, and to control the first driving module and the second driving module to be turned off when the air fryer stops cooking.

10. An air fryer according to any one of claims 2 to 4, wherein, The air fryer further comprises a driving circuit comprising a third driving module, a third capacitor, a fourth driving module, and a fourth capacitor, the third driving module is electrically connected to the fourth driving module to form a third branch, the third capacitor is electrically connected to the fourth capacitor to form a fourth branch, two ends of the third branch are electrically connected to two ends of the fourth branch, one end of the primary heating device is electrically connected between the third driving module and the fourth driving module, and the other end is electrically connected between the third capacitor and the fourth capacitor.

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