Air fryer with IH coil heating plate at bottom

Abstract

The invention relates to an air fryer with a bottom IH coil heating plate, and aims to solve the technical problems that the existing similar air fryer with upper and lower heating pipes is poorer in bottom heating temperature stability and more difficult to control, and meanwhile, the steam heating structure design and the inner pot putting induction detection structure design are too complicated and the production cost is higher. The air fryer is characterized in that an IH coil heating plate is arranged at a metal heat insulation layer at the bottom of the lower portion of an inner pot of the air fryer, a grill is arranged in the inner pot, the inner pot is a non-magnetic pot body or a ferrite pot body, and the grill is a ferrite grill; the baking tray is aligned with the IH coil heating tray below, and the grill in the inner pot is heated by the magnetic induction of the IH coil heating tray through the inner pot; when the inner pot is a non-magnetic pot body, a glass layer is arranged at the hollow part in the middle of the inner bottom of the inner pot; meanwhile, the IH coil heating disc serves as a microswitch, and whether the inner pot of ferrite is placed or not is sensed through the magnetic field generated by the IH electromagnetic module before use.

Description

Technical Field

[0001] The invention relates to an air fryer, in particular to an air fryer with a bottom IH coil heating plate. Background Art

[0002] An air fryer is a new type of household appliance that uses high-speed air circulation technology to fry food. The food it makes can reduce 80% of the fat compared to traditional electric fryers. It is easy to clean in daily use, safe and economical, and is very popular. Some existing air fryers have upper and lower heating tubes on the inner pot, such as the application number 202320435577.X disclosed in the Chinese patent literature, the authorization announcement date is 2023.09.26, and the utility model name is "Air fryer bottom heating structure"; other similar products use the working principle of air fryers for cooking pizza, and replace the lower heating tube at the bottom of the inner pot with an IH electromagnetic module and its IH heating plate, such as the application number 202410422595.3 disclosed in the Chinese patent literature, the application announcement date is 2024.07.16, and the invention name is "An electromagnetic heating pizza machine and its control method". IH heating is a technology that uses the principle of electromagnetic induction for heating. It is efficient, uniform and safe. The working principle of IH heating is to generate a magnetic field through an electromagnetic coil, so that the inner pot directly generates heat, thereby avoiding the heat conduction loss in traditional heating methods. The heat conversion rate is extremely high, reaching more than 95%. The air fryer with upper and lower heating tubes mentioned above adopts radiation heating methods such as bottom heating and multi-purpose electric heating tubes. Since the grill is usually set in the inner pot, the temperature conduction efficiency of the electric heating tube is relatively low, and the high temperature generates a large amount of excess temperature, which will cause excessive temperature rise of the whole machine. High temperature resistant materials are also required locally, and the cost will also increase. For other air fryers with steam function, if steam is generated, a complex closed structure is required for safety, which is costly. At the same time, most of the air fryers on the market currently use machine switches to control the opening and closing of the heating tube, which is relatively complicated to install and cost. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the present invention is to provide a bottom IH coil heating plate air fryer in the art, so as to solve the technical problems that the bottom heating temperature stability of the existing similar air fryers with upper and lower double heating tubes is poor and difficult to control, and the steam heating structure design and the inner pot induction detection structure design are too complicated and the production cost is high. The purpose is achieved through the following technical solutions.

[0004] A bottom IH coil heating plate air fryer, the shell of the air fryer has an opening on one side thereof, an inner pot is provided in the inner pot, a handle is provided on the outer side thereof, a first fan blade and an electric heating tube are provided in the groove at the top of the metal insulation layer above the inner pot in the shell, the first fan blade is connected through the motor shaft of the motor provided at the top of the metal insulation layer in the machine head; an IH coil heating plate is provided at the metal insulation layer at the bottom below the inner pot in the shell, a second fan blade is provided in the body below the IH coil heating plate, the second fan blade is a heat dissipation fan, the fan blade circuit board of the second fan blade, and the motor and the electric heating tube are connected to the PCB circuit board provided at the top of the metal insulation layer in the machine head through a line. The key points of its structural design are that the height of the inner pot is greater than 110 mm, a grill is provided in the inner pot, the inner pot is a non-magnetic pot body or a ferrite pot body, and the grill is a ferrite grill; the grill is aligned with the IH coil heating plate below, and the magnetic induction of the IH coil heating plate heats the grill in the inner pot through the inner pot. Thus, the air fryer adds an IH coil heating plate at the bottom of the metal insulation layer, and the IH coil heating plate heats the grill in the air fryer through the air; at the same time, a steam cooking form of a soup and rice pot with a lid is added below, and the influence of the steam generated by cooking on the product is eliminated by the above-mentioned high-temperature heating and drying steam method; and the IH electromagnetic module in the IH coil heating plate is used to detect whether there is an inner pot to determine whether to heat or not, and the structure is simpler and the production cost is lower. Compared with the existing metal heating tube structure at the bottom of the body, the IH coil heating plate structure at the bottom of the body is convenient for directly generating heat for the ferrite component, and the heat conversion rate is higher, especially with the electric heating tube at the top of the body, the bottom heating and cooking effect of the food on the non-direct contact ferrite grill is better, and the upper and lower cooking effects of the food on the grill are better. The above-mentioned grill is preferably set close to the bottom of the inner pot. At the same time, the use of the grill and the glass city below facilitates the cleaning of the bottom of the pot body, which is the development trend of existing similar air fryers; when the inner pot is a ferrite pot body, the food at the bottom of the inner pot can also be heated by the IH coil heating plate.

[0005] When the inner pot is set inside the machine body, the IH electromagnetic module in the IH coil heating plate generates a magnetic field that senses the ferrite, generates resistance and a large current, and the PCB circuit board triggers the IH coil heating plate, the motor and the electric heating tube to work. Therefore, before working, the PCB circuit board first triggers the IH electromagnetic module of the IH coil heating plate to detect the ferrite and then triggers the work of the corresponding components; if the IH electromagnetic module of the IH coil heating plate does not detect the ferrite, it means that the inner pot and its baking tray are not placed inside the machine body, and the corresponding components do not start working.

[0006] A micro switch is provided at the inner edge of the opening on one side of the shell, and the micro switch is connected to the PCB circuit board through a circuit. When the inner pot is inside the body, the inner pot triggers the micro switch through the ejector pin. The micro switch cooperates with the IH electromagnetic module detection of the IH coil heating plate to make it safer, or the micro switch can be omitted.

[0007] A glass layer is provided in the hollowed-out portion of the inner bottom of the inner pot, so that the magnetic induction of the IH coil heating plate can pass through the inner pot to heat the grill in the inner pot. In particular, when the inner pot is a non-magnetic pot such as an aluminum pot, or an iron pot, a glass layer is provided at the bottom, so that the grill is heated and the heat conduction effect is better.

[0008] An NTC temperature sensor is provided on one side of the groove at the top of the metal insulation layer above the inner pot in the shell, and the NTC temperature sensor is connected to the PCB circuit board through a line. Thus, through the cooperation of the NTC temperature sensor and the control chip and control program on the PCB circuit board, the operation of the corresponding fan blades and heating components under different temperature states can be more accurately controlled.

[0009] A soup and rice pot is arranged in the middle of the bottom of the inner pot, a pot cover is arranged at the pot mouth of the soup and rice pot, and an exhaust hole is arranged on one side of the pot cover.

[0010] An air guide cover is arranged on the top of the metal heat insulation layer above the first fan blade, and a radial stirring fan blade is arranged inside the air guide cover. The motor is arranged on the top of the air guide cover, and the motor shaft of the motor is connected to the radial stirring fan blade and the first fan blade at the same time.

[0011] The grill has a flat area in the middle and hollow through-hole areas symmetrically arranged on both sides. The grill is fixed by bosses symmetrically arranged and stamped on both sides of the pot body of the inner pot. The above structure facilitates the placement of the baking tray in the inner pot and the placement of the soup and rice pot on the grill. The soup and rice pot can also be directly placed in the inner pot for use.

[0012] The inner pot has two handles symmetrically arranged on one side of the outer diameter, and the length of the inner pot is greater than the width and less than twice the width. The above is an embodiment of a large-capacity inner pot, and the inner pot can be set according to the capacity and the machine body.

[0013] The invention has reasonable structural design, convenient production and assembly, low production cost, good safety, good heating effect, high efficiency, and precise temperature sensing and temperature control; it is suitable for use as a bottom IH coil heating plate air fryer, as well as a structural improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present invention, in which the dotted line on the top of the machine body is the internal structure of the machine head, and the dotted line is the magnetic induction line.

[0015] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the inner pot.

[0016] Figure 3 yes Figure 2 Schematic diagram of the inner pot steam cooking state structure.

[0017] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure of a soup rice pot.

[0018] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure of steam cooking usage status.

[0019] Figure 6 yes Figure 5 Schematic diagram of the magnetic induction cross-sectional structure when the inner pot is taken out, where the dotted lines are the magnetic induction lines.

[0020] Serial numbers and names of the accompanying drawings: 1. outer shell, 2. first fan blade, 3. electric heating tube, 4. inner pot, 5. handle, 6. grill, 7. IH coil heating plate, 8. second fan blade, 9. glass layer, 10. radial stirring fan blade, 11. NTC temperature sensor, 12. soup and rice pot, 13. pot cover. Implementation

[0021] Now, the structure and use of the present invention will be further described in conjunction with the accompanying drawings. Figure 1-Figure 6 As shown, the shell 1 of the air fryer has an opening on one side in which an inner pot 4 is arranged, a handle 5 is arranged on the outside of the inner pot, a first fan blade 2 and an electric heating tube 3 are arranged in a groove at the top of the metal insulation layer above the inner pot in the shell, and the first fan blade is connected through the motor shaft of the motor arranged at the top of the metal insulation layer in the machine head; an IH coil heating plate 7 is arranged at the metal insulation layer at the bottom below the inner pot in the shell, and a second fan blade 8 is arranged in the body below the IH coil heating plate, and the second fan blade is a heat dissipation fan, and the fan blade circuit board of the second fan blade, and the motor and the electric heating tube are connected to the PCB circuit board arranged at the top of the metal insulation layer in the machine head through the line. The height of the above inner pot is greater than 110mm, and a grill 6 is arranged in the inner pot, the inner pot is a non-magnetic pot body or a ferrite pot body, and the grill is a ferrite grill; the grill is aligned with the IH coil heating plate below, and the magnetic induction of the IH coil heating plate heats the grill in the inner pot through the inner pot. When the inner pot is arranged inside the machine body, the IH electromagnetic module in the IH coil heating plate generates a magnetic field which senses the ferrite, generates resistance and a large current, and the PCB circuit board triggers the IH coil heating plate, the motor and the electric heating tube to work.

[0022] A glass layer 9 is provided in the hollowed-out middle of the bottom of the inner pot; an NTC temperature sensor 11 is provided on one side of the groove at the top of the metal insulation layer above the inner pot in the outer shell, and the NTC temperature sensor is connected to the PCB circuit board through a line. A soup and rice pot 12 is provided in the middle of the bottom of the inner pot, and a pot cover 13 is provided at the mouth of the soup and rice pot, and an exhaust hole is provided on one side of the pot cover. The soup and rice pot is placed in the middle of the inner pot, and a reserved gap is provided between the outer diameter of the inner pot and the inner wall of the inner pot, and a corresponding placement area is provided at the bottom of the inner pot. An air guide cover is provided on the top of the metal insulation layer above the first fan blade, and a radial stirring fan blade 10 is provided in the air guide cover. The motor is arranged on the top of the air guide cover, and the motor shaft of the motor is connected to the radial stirring fan blade and the first fan blade at the same time.

[0023] The grill has a plane area in the middle and hollow through-hole areas symmetrically arranged on both sides. The grill is fixed by bosses symmetrically arranged and stamped on both sides of the inner pot. Two handles are symmetrically arranged on one side of the inner pot. The length of the inner pot is greater than the width and less than twice the width.

[0024] The air fryer has three design options: Option 1: Figure 1 , Figure 2 As shown, the air fryer has an IH coil heating plate at the bottom, and a grill is provided in the inner pot. The grill material is ferrite, and the inner pot is preferably made of non-magnetic material (e.g. glass, plastic, ceramic, and the above plastic is a high-temperature resistant special fiber plastic). Its working principle is: the IH coil heating plate forms a magnetic field with high-speed and high-frequency oscillation, which makes the grill in the inner pot heat up, and then conducts heat to the food placed on the grill, thereby achieving three-dimensional, direct and efficient heating.

[0025] Option 2, such as 3- Figure 5 As shown, the inner pot of the air fryer is provided with a soup and rice pot, and the pot is provided with a pot cover. The bottom of the air fryer is also provided with an IH heating coil disk; when the steam generated after heating is discharged from the exhaust hole of the pot cover, it is dried by the temperature generated by the electric heating of the air fryer, thus avoiding the influence of steam on the machine. Its working principle is: the IH coil heating disk heats the soup and rice pot, and the steam generated by the liquid in the soup and rice pot after heating is discharged, and the high temperature generated by the electric heating tube dries the steam.

[0026] Solution 2 is a simple embodiment of an air fryer with steam cooking function. On the one hand, it can be convenient for cooking foods such as soup and rice, and can be equipped with as many soup pots or rice pots as necessary to simultaneously meet the needs of cooking a variety of foods and consumers. On the other hand, the generated steam is dried by the electric heating tube or blown out of the body by the fan blades.

[0027] Option 3: Figure 6As shown, the bottom of the air fryer is equipped with an IH coil heating plate. Since the IH principle is to generate high-frequency oscillations through electromagnetic waves, it is necessary to sense ferrite. By using this principle, when the inner pot leaves the machine body, the IH coil heating plate does not sense the inner pot and does not generate heating, and the top electric heating tube will not heat up, thereby protecting the safety of consumers and reducing the cost of traditional micro switches. Its working principle is: the IH coil heating plate generates a magnetic field. When the inner pot is inside the machine body, the magnetic field senses the ferrite, generating resistance and large current; if the inner pot is taken out, the magnetic field does not sense the ferrite, there is no resistance and current, and it is determined that the inner pot is not in the machine body.

[0028] To sum up, the air fryer includes a new type of air fryer and its inner pot detection and judgment method. The air fryer adopts the magnetic induction function of the IH principle, which is simple and efficient, has various structural forms, a wide range of applications, low production costs, and has market promotion value.

[0029] The above contents are intended to illustrate the technical means of the present invention, but not to limit the technical scope of the present invention. Those skilled in the art may make obvious improvements or substitutions to the present invention in combination with existing common knowledge, which also fall within the protection scope of the claims of the present invention.

Claims

1. An air fryer with a bottom IH coil heating plate, wherein an inner pot (4) is arranged in an opening on one side of a shell (1) of the air fryer, a handle (5) is arranged on the outer side of the inner pot, a first fan blade (2) and an electric heating tube (3) are arranged in a groove at the top of a metal insulation layer above the inner pot in the shell, and the first fan blade is connected through a motor shaft at a motor arranged at the top of the metal insulation layer in a machine head; an IH coil heating plate (7) is arranged at the metal insulation layer at the bottom below the inner pot in the shell, a second fan blade (8) is arranged in the machine body below the IH coil heating plate, the second fan blade is a heat dissipation fan, a fan blade circuit board of the second fan blade, and the motor and the electric heating tube are connected to a PCB circuit board arranged at the top of the metal insulation layer in the machine head through a line; characterized in that The inner pot (4) is provided with a grill (6), the inner pot is a non-magnetic pot body or a ferrite pot body, and the grill is a ferrite grill; the grilling plate is aligned with the IH coil heating plate (7) below, and the magnetic induction of the IH coil heating plate heats the grill in the inner pot through the inner pot.

2. The bottom IH coil heating plate air fryer according to claim 1, characterized in that When the inner pot (4) is arranged inside the machine body, the IH electromagnetic module in the IH coil heating plate (7) generates a magnetic field that induces the ferrite, generates resistance and a large current, and the PCB circuit board triggers the IH coil heating plate, the motor and the electric heating tube (3) to work.

3. The bottom IH coil heating plate air fryer according to claim 1 or 2, characterized in that A micro switch is provided at the inner edge of the opening on one side of the housing (1); the micro switch is connected to the PCB circuit board via a line; when the inner pot (4) is inside the machine body, the inner pot triggers the micro switch via a pin.

4. The bottom IH coil heating plate air fryer according to claim 1, characterized in that A glass layer (9) is provided in the hollowed-out portion in the middle of the bottom of the inner pot (4).

5. The bottom IH coil heating plate air fryer according to claim 1, characterized in that An NTC temperature sensor (11) is provided on one side of the top groove of the metal heat insulation layer above the inner pot (4) in the outer shell (1), and the NTC temperature sensor is connected to the PCB circuit board via a line.

6. The bottom IH coil heating plate air fryer according to claim 1, characterized in that A soup and rice pot (12) is provided in the middle of the bottom of the inner pot (4), a pot cover (13) is provided at the pot mouth of the soup and rice pot, and an exhaust hole is provided on one side of the pot cover.

7. The bottom IH coil heating plate air fryer according to claim 1, characterized in that An air guide cover is provided on the top of the metal heat insulation layer above the first fan blade (2), and a radial stirring fan blade (10) is provided inside the air guide cover. A motor is arranged on the top of the air guide cover, and a motor shaft of the motor is connected to both the radial stirring fan blade and the first fan blade.

8. The bottom IH coil heating plate air fryer according to claim 1, characterized in that The grill (6) has a plane area in the middle and hollow through-hole areas symmetrically arranged on both sides. The grill is fixed by bosses that are symmetrically arranged on both sides of the pot body of the inner pot (4) and formed by stamping.

9. The bottom IH coil heating plate air fryer according to claim 1, characterized in that Two handles (5) are symmetrically arranged on one side of the outer diameter of the inner pot (4); the length of the inner pot is greater than the width and less than twice the width.

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