Air stove

Abstract

The present invention belongs to the field of stoves, and particularly relates to an electric stove. An air stove, comprising a housing, a heat generation unit, a control unit, and a heat insulation layer, and further comprising a furnace chamber and a fan system, wherein the furnace chamber is divided into at least two chambers, namely an inner chamber and an outer chamber, two ends of one chamber being in communication with two ends of another chamber; the fan system comprises an electric motor and fan blades, the fan blades being arranged in the furnace chamber, the electric motor being arranged outside the heat insulation layer, and the fan blades being connected to a shaft of the electric motor; the heat generation unit is arranged in the outer chamber of the furnace chamber; and the fan system sucks in air from one end of the furnace chamber, and the air flows through the heat generation unit and then enters the inner chamber of the furnace chamber from the other end.

Description

An air stove Technical Field

[0001] The invention belongs to the field of stoves, in particular to an electric stove. Background Art

[0002] The existing stoves still have some shortcomings. Gas stoves have a single function, the flame temperature is high, the oil is easy to decompose, and the food is easy to burn. Even if the fire is turned down, the overall heat energy is reduced, and the local temperature is still high. Frying requires more oil to use its convection heat transfer as a heat transfer medium to prevent burning, so gas stoves actually make cooking unhealthy; because they need to be connected to a gas source, they are fixed in position and inconvenient to move; there are also safety hazards such as exhaust gas, flameout, gas leakage, and fire caused by high-temperature open flames, which are particularly serious when used by the elderly and children; nearly half of the heat energy of gas stoves is not absorbed by the pots and directly dissipates into the surrounding environment, which is inefficient and causes energy waste. Cooking in summer is very hot; in places where there is no pipeline natural gas, using bottled gas is costly and has great safety hazards; the firepower of natural gas stoves is limited by pipeline pressure, and when too many users use it at the same time, the firepower is not strong enough; but even with so many problems, gas stoves are still the most widely used stoves in current cooking, because current electric stoves have more problems. For example, the most popular induction cooktop among electric stoves is not only picky about pots, but also heats up too quickly due to the direct heat from the iron body, making it difficult to control the pot temperature and easily burning food. At the same power level, it produces much more smoke than a gas stove, making cooking less tasty and unhealthy. Induction cooktops also have the same limited functionality as gas stoves. Ceramic stovetops, which are essentially a glass cover over a regular electric stove, are less safe than electric stoves in other respects. They heat up more slowly, retain a lot of heat, are inefficient, and have a panel that can easily burn people and even explode. While these are their own issues, they all share the common problem of not being able to precisely control the pot temperature, requiring a high level of skill in mastering the heat. This, combined with the unhealthy nature of cooking, and their limited functionality, leads to overcrowding and waste in the kitchen due to the overabundance of appliances. Technical issues

[0003] In order to solve the deficiencies of existing stoves, the present invention proposes a new technical solution to solve one or more problems existing in existing stoves. Technical Solutions

[0004] In order to solve the deficiencies of existing stove technology, the present invention provides a new technical solution.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] An air stove includes an outer shell, a heating unit, a control unit, an insulation layer, a furnace cavity, and a fan system. The furnace cavity is divided into an inner cavity and an outer cavity, at least two cavities connected at both ends; the fan system includes a motor and fan blades, the fan blades are arranged in the furnace cavity, the motor is arranged outside the insulation layer, and the fan blades are connected to the shaft of the motor; the heating unit is arranged in the outer cavity of the furnace cavity; the fan system draws air from one end of the furnace cavity, and the air flows through the heating unit and then enters the inner cavity of the furnace cavity from the other end.

[0007] Optionally, the furnace cavity includes a furnace cavity inner wall, a furnace cavity outer wall, and a furnace cavity cover. Any two of the furnace cavity inner wall, furnace cavity outer wall, and furnace cavity cover can form a whole and then be assembled with a third part to form a furnace cavity; or each of them can be an independent part, and the three can be assembled together to form a furnace cavity.

[0008] Optionally, a temperature sensor is further included, and the temperature sensor is installed on the air outlet channel of the heating unit.

[0009] Optionally, it also includes a fan blade shell and an air guide wheel. The fan blade shell is arranged at the lower end connecting the inner cavity and the outer cavity of the furnace cavity, and the fan blades are arranged in the fan blade shell; the air guide wheel is arranged at the air outlet end of the fan blade shell, and the air guide wheel uses spokes and inclined surfaces to guide the flow of air.

[0010] Optionally, it also includes a push rod, a spring, and a nozzle. The shaft of the motor is set as a hollow shaft, and the spring is assembled in the hollow shaft of the motor; the nozzle is set outside the guide wheel, and the nozzle can move up and down along the axis of the wind blade shell; one end of the push rod is connected to the spring, and the other end is connected to the nozzle.

[0011] Optionally, the motor is arranged on the suction side of the fan blade, and an suction gap is provided between the insulation layer and the motor shaft through hole and the shaft of the furnace cavity. When the motor drives the fan blade to rotate, cold air is sucked in from the suction gap to cool the shaft of the motor.

[0012] Optionally, the heating unit includes a heating wire, a heating wire coil rack, and a terminal. The heating wire coil rack is provided with a ventilation slot, and the heating wire is installed in the ventilation slot; one end of the terminal is connected to the heating wire by a conductive manner, and the other end passes through the furnace cavity and is connected to the control unit by a wire; the control unit 8 includes a wind speed adjustment module and a temperature control module.

[0013] Optionally, the furnace cavity includes a furnace cavity inner wall, a furnace cavity outer wall, and a furnace cavity cover; the furnace cavity inner wall constitutes the inner cavity of the furnace cavity, and the inner cavity is the space for the air stove to heat pots or food; the furnace cavity inner wall, the furnace cavity outer wall and the furnace cavity cover together constitute the outer cavity of the furnace cavity, and the heating unit is arranged in the outer cavity; the furnace cavity inner wall is connected to the top and bottom of the furnace cavity outer wall; it also includes a fan blade shell and an air guide wheel, the fan blade shell is arranged on the furnace cavity inner wall or the furnace cavity cover, the fan blade is arranged in the fan blade shell, and the air guide wheel is arranged on the air outlet side of the fan blade shell; the furnace cavity cover is arranged at the bottom of the furnace cavity, the motor is installed on the furnace cavity cover, and the motor shaft passes through the insulation layer and the furnace cavity cover and is connected to the fan blade; it also includes a temperature sensor, and the temperature sensor is installed on the air outlet channel of the heating unit.

[0014] Optionally, it also includes an inner cavity drain pipe, an outer cavity drain pipe, and a one-way drainage device; the inner cavity drain pipe is arranged on the inner wall of the furnace cavity, the outer cavity drain pipe is arranged on the furnace cavity cover, and the inner cavity drain pipe uses the space of the outer cavity drain pipe for drainage; the one-way drainage device is arranged on the water outlet channel of the outer cavity drain pipe to prevent a large amount of air from being sucked in from the outer cavity drain pipe.

[0015] Optionally, the shell includes an upper shell and a bottom cover, the bottom cover is provided with a ventilation slot, one end of the ventilation slot is provided with an exhaust hole, and the motor is placed in the ventilation slot after the upper shell and the bottom cover are assembled; the bottom cover is also provided with an air inlet, and the position of the air inlet allows the air entering the shell to flow through the control unit; it also includes a cooling fan, the air intake of the cooling fan is connected to the space where the control unit is located, and the air outlet of the cooling fan is connected to the ventilation slot of the bottom cover. Beneficial effects

[0016] An air stove of the present invention can achieve one or more of the following beneficial effects: using hot air heating and waste heat recovery to achieve the same fire-frying effect as a gas stove and achieve energy-saving effects close to those of an induction cooker; achieving precise temperature control, uniform temperature, not easy to stick to the pan, less oil smoke, making cooking healthier and simpler; it is not picky about pots and has better practicality; it can realize some or all of the functions of a series of home appliances such as ovens, air fryers, electric grills, teppanyaki, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 is an explosion diagram of an air stove

[0019] Figure 2 is a schematic diagram of the structure of an air stove.

[0020] Figure 3 is a cross-sectional view of a furnace

[0021] Figure 4 is a cross-sectional view of a furnace

[0022] Figure 5 is a schematic diagram of the structure of an air stove

[0023] Figure 6 is a schematic diagram of the wind guide wheel structure

[0024] Figure 7 is a schematic diagram of the fan system structure

[0025] Figure 8 is a schematic diagram of the structure of an air stove

[0026] Figure 9 is a schematic diagram of the structure of an air stove

[0027] Figure 10 is an exploded view of a heating unit

[0028] Figure 11 is a schematic diagram of the drainage pipe structure

[0029] Figure 12 is a schematic diagram of a cross-section cooling system for an air stove.

[0030] Figure 13 is a schematic diagram of the bottom of an air stove

[0031] Figure 14 is a schematic diagram of the structure of an air stove

[0032] Figure 15 is a schematic diagram of the structure of an air stove

[0033] Figure 16 is an appearance diagram of an air stove

[0034] In the picture:

[0035] Upper shell 2, bottom cover 201, ventilation slot 202, exhaust hole 203, air inlet 3, oven cavity 301, oven cavity inner wall 302, oven cavity outer wall 303, oven cavity cover 304, inner cavity drain pipe 305, outer cavity drain pipe 306, filter 307, corner piece 4, fan shell 5, heating unit 501, heating wire coil rack 502, heating wire 503, heating wire 6, fan system 601, motor 602, fan blade 603, heat sink 604, push rod 605, spring 606, shock-absorbing pad 7, cooling fan 701, air intake 702, air outlet 8, control unit 9, thermal insulation layer 10, air guide wheel 11, nozzle 12, power supply 13, temperature sensor 14, one-way drainage device 15, sealing ring 16, pot 17, wind speed adjustment knob 18, temperature adjustment knob. Best Mode for Carrying Out the Invention

[0036] It should be noted that, under the premise of no conflict, the embodiments and features in the embodiments of this application can be combined with each other, and any solution that can be easily thought of through this patent is within the scope of protection of this patent. The present invention is further described below with reference to the accompanying drawings and embodiments. Example 1

[0037] An air stove includes an outer shell, a heating unit 5, a control unit 8, an insulation layer 9, and also includes a furnace cavity 3 and a fan system. The furnace cavity is divided into an inner cavity and an outer cavity with at least two cavities connected at both ends; the fan system includes a motor 601 and a fan blade 602, the fan blade is arranged in the furnace cavity, the motor is arranged outside the insulation layer 9, and the fan blade is connected to the shaft of the motor; the heating unit 5 is arranged in the outer cavity of the furnace cavity 3; the fan system draws air from one end of the furnace cavity, and the air flows through the heating unit and then enters the inner cavity of the furnace cavity from the other end.

[0038] As shown in Figures 2, 3, and 1, the air stove's outer shell is composed of an upper shell 1 and a bottom cover 2. This is a single-stove outer shell structure. If the air stove of the present invention, excluding the upper shell and the bottom cover, is installed in another stove, then the structures that support and insulate the stove can be considered the outer shell. For example, if the present invention is used to transform it into a heating table, the tabletop is the outer shell. If the present invention is integrated into an integrated stove, the outer shell of the integrated stove is the outer shell. The oven cavity 3 shown in Figures 2 and 3 is barrel-shaped, with one end open for placing pots and pans. It is divided into two connected spaces, an inner cavity and an outer cavity, to achieve hot and cold air circulation within the oven cavity and also to achieve electrical safety isolation for the heating unit 5. Of course, it also has the function of thermal isolation, preventing the heating unit 5, oven cavity 3, and insulation layer 9 from directly heating the pot through air convection and radiation after heat is stored, causing a delay in adjusting the firepower. This will not be explained in detail here and will be introduced in detail later. The oven cavity 3 shown in Figures 2 and 3 has a conical space as the inner cavity and an outer cavity outside the conical space, creating a concentric structure with the outer cavity surrounding the inner cavity. Alternatively, two or more cavities may be arranged in parallel, with one or more inner cavities housing the cookware and one or more outer cavities housing the heating units. The inner and outer cavities are connected at both ends, allowing air to circulate between the inner and outer cavities after the cookware seals the oven cavity opening. The cavity housing the cookware is considered the inner cavity, and the remaining cavities are the outer cavities. Because the opening for the cookware is generally the center of the stove, the center is considered the inner cavity, and the periphery is the outer cavity. The arrows in Figure 3 indicate how air circulates between the inner and outer cavities of the oven cavity. This circulation is only achieved when a cookware is placed. If no cookware is placed, as shown by the arrows in Figure 2, most of the hot air will be released into the atmosphere, while the oven cavity will mostly draw in cooler air from the outside. As long as there are two connected cavities, whether concentric or parallel, the function can be achieved. However, multiple cavities are also possible, such as in the case of multiple heating units or multiple cooktops.

[0039] Due to the high operating temperature of the oven cavity, the bottom and sides are wrapped with an insulation layer 9. This insulation layer can be made of refractory insulation materials such as glass wool and rock wool. For household products that require compactness and refinement, nano-aerogel materials with lower thermal conductivity, such as silica nano-aerogel felt, can be used. The insulation layer can be thinner, making the air stove look lighter and more refined. Of course, vacuum insulation is more effective and thinner, but vacuum insulation can easily lose its vacuum and become ineffective. The heating unit 5 is installed in the outer cavity of the oven cavity 3, primarily for safety reasons. It is electrically isolated by the inner wall 301 of the oven cavity. It is installed in a position that is not accessible to users, even children with a wire. Soup entering the oven cavity cannot splash onto the heating unit. Of course, installation in the outer cavity also solves the problem of thermal lag caused by heat storage in the cookware. Cookware such as electric stoves and ceramic stoves cannot adjust the temperature as quickly as gas stoves because the heat stored in the heating unit directly affects the cookware. The heating unit in Figure 2 is a disc heater, which is determined by the structure of the furnace cavity. If the inner and outer cavities of the furnace cavity are not concentric structures, it may be better to use other heater structures. Heaters of any structure and principle can be used as long as they can meet the use requirements. However, from the perspective of preference, heaters with light weight, low cost and long life are better. The reason for light weight is to consider less heat storage, so that the air stove heats up quickly and there is less residual heat after shutdown.

[0040] To function, the fan system must include at least motor 601 and fan blades 602. In Figure 2, fan blades 602 are mounted at the throat connecting the inner and outer chambers of the furnace cavity. Motor 601 is mounted outside insulation layer 9, thermally isolating it from the furnace cavity. The shaft of motor 601 passes through the insulation layer and the furnace cavity to connect to fan blades 602. In Figure 2, the motor is mounted at the bottom of the furnace cavity, coaxial with the fan blades. This is a simple and space-saving installation method. The motor can also be mounted on the side wall of the furnace cavity, transmitting torque to the fan blades via gears, chains, or belts. The arrows in FIG2 indicate the air flow when no cookware is placed on the air cooker. At this time, the air blown by the fan blades 602 is released into the atmosphere. If a cookware is placed, the opening above the oven cavity will be sealed. As indicated by the arrows in FIG8 or FIG3, the air circulates inside the oven cavity. Except for the heat dissipation by the insulation layer and the heat storage loss of the air cooker, all the heat energy will be transferred to the cooker, which is much more energy-efficient than a gas cooker. If the insulation layer is well insulated and the oven cavity, heating unit, fan blades and other heat storage components are as light as possible, the efficiency of this air cooker will be comparable to that of an induction cooker. As shown in FIG2, the motor 601 drives the fan blades 602 to rotate, blowing air into the inner cavity of the oven cavity 3, thereby forming a negative pressure in the outer cavity of the oven cavity. Air is sucked in through the gap between the inner and outer cavities and passes through the heating unit 5. If the heating unit 5 is not in operation, the air flowing through it will be heated and the hot air will be blown into the inner cavity by the fan blades, thus using the hot air as a medium for heating. The motor 601 and the heating unit 5 are controlled by a control unit 8. The control unit 8 can be a circuit board containing various electronic components, enabling control of parameters such as motor speed, heating unit power, and oven cavity temperature. Alternatively, the control unit 8 can simply be one or more mechanical switches, which can be used to manually power the heating unit 5 and the motor on and off. Even if the control unit 8 is a simple mechanical switch, the heating unit 5 is electrically isolated and meets the safety standards of Class II electrical appliances. The forced convection of hot air simulates the heating method of a gas stove, resulting in high heat transfer efficiency and uniform temperature. Its safety and performance are far superior to those of an electric stove, and its performance is far superior to that of an electric ceramic stove or an induction cooker. Compared to these two stoves, it is also not picky about the shape and material of the cookware.

[0041] The structure shown in Figure 1 can realize the basic functions of this air stove. The heating unit and the motor are controlled by a mechanical switch. There is no cooling fan to cool the inside of the shell. As long as the insulation layer is made thick enough, the inside of the shell will maintain a suitable temperature. As long as the motor shaft is long enough, the heat transferred from the fan blades to the motor will dissipate along the way, and a ceramic shaft with poor thermal conductivity can be used, or the motor shaft and the fan blades can be connected in a heat-insulating manner. In this way, there is no problem even if the motor is not cooled. There is no temperature sensor. It is sufficient to match the power of the heating unit with the air volume of the fan blades. In case the heat load of the heating wire is too large, it will just burn out, and will not cause any danger to the user and the surrounding environment.

[0042] In order to achieve better results, the following are optional improvements to the air stove:

[0043] FIG3 is a schematic diagram of a furnace cavity cross-section, which provides a preferred furnace cavity structure. The furnace cavity 3 includes a furnace cavity inner wall 301, a furnace cavity outer wall 302, and a furnace cavity cover 303. Any two of the furnace cavity inner wall, furnace cavity outer wall, and furnace cavity cover can form a whole and then be assembled with a third part to form a furnace cavity; or each of the furnace cavity inner wall, furnace cavity outer wall, and furnace cavity cover can be an independent part, and the three can be assembled together to form a furnace cavity. The space enclosed by the furnace cavity inner wall 301 alone is the inner cavity, and the space enclosed by the furnace cavity inner wall, furnace cavity outer wall, and furnace cavity cover together is the outer cavity. The furnace cavity inner wall and furnace cavity outer wall can be formed by rolling metal sheets and welding them, or by stretching or extrusion, or by casting or extrusion of refractory insulating materials such as clay, refractory clay, and refractory cement to form at least two cavities connected at both ends. The inner cavity is the space for heating pots or food, and the outer cavity is used to place heating elements and other related components. The inner wall of the furnace cavity can also be made of high-temperature resistant glass material, so that the heat radiation of the heating unit can directly heat the pot or food through the inner wall of the furnace cavity; of course, the inner wall of the furnace cavity is made of thin metal material, and part of the heat energy can also be transferred to the inner cavity. When the fan system is not working, the inner wall 301 of the furnace cavity is like a pot placed on an electric stove. It only needs to control the power of the heating unit 5 through the control unit 8 to keep the temperature in the outer cavity within a suitable range to work normally; this mode that does not require the fan system to work mainly transfers heat through natural convection. The heating efficiency is extremely low across several layers of thermal barriers, and it can be used for purposes with low firepower requirements such as stewing sweet potatoes and keeping warm. The inner and outer walls of the furnace cavity can be connected together to form a single component. This can be integrally formed, for example, by extrusion or casting of refractory materials, by stretching or stamping metal sheets, or by welding. As shown in Figure 14, the inner and outer walls are welded together via multiple angle pieces 307 to form a single component. This component can be connected to the furnace cavity cover by screws. The ridges shown in the figure represent the locations for the screws, but screw posts can also be provided without the ridges, or riveting can be used. The outer wall of the furnace cavity can also be connected to the furnace cavity cover to form a single component, as shown in Figures 4 and 15. In this case, the furnace cavity cover is actually the base of the component, not a cover in the traditional sense. Since there are many ways to achieve the objectives of the present invention, and contradictions are inevitable, we will not be limited by the name. The process for connecting the outer wall of the furnace cavity cover is the same as described above. The inner wall of the furnace cavity 301 can also be combined with the furnace cavity cover 303. In this combination, the motor and the fan housing share the same reference as the furnace cavity cover, ensuring their concentricity. Of course, these three components can also be assembled as separate components to form the furnace cavity. The fan housing 4 can be integrally formed with the furnace cavity inner wall 301, or can be an independent part assembled with the furnace cavity. As shown in Figures 2, 14, and 15, if it is an axial flow fan, the fan housing 4 can be omitted. The fan housing is only a necessary structure in centrifugal fan or mixed flow fan structures.

[0044] To reduce heat storage, increase the air stove's temperature-rise rate, and minimize heat loss, furnace cavity 3 is best constructed from thin-walled metal. For example, the inner and outer walls of the furnace cavity can be made of 0.25mm thick stainless steel. These can be stamped with concave and convex shapes for increased strength, or even thinner stainless steel can be used. The furnace cavity cover 303, which houses the motor and requires a certain level of strength and rigidity, can be stamped from approximately 0.5mm thick stainless steel, with reinforced ribs added for added strength. Stainless steel maintains excellent mechanical properties and corrosion resistance at temperatures below 800°C, making it a preferred option for furnace cavity construction due to its light weight, low heat storage, long lifespan, low price, and simple processing. As shown in the furnace cavity cross-sectional view of Figure 4, a filter screen 306 is provided in the channel connecting the inner cavity of the furnace cavity and the upper end of the outer cavity. The filter screen can be a part of the furnace cavity or an independent part. The filter screen is used to prevent foreign matter from entering the outer cavity of the furnace cavity from here, and can also prevent children from reaching in with a wire from here and touching the heating unit 5. The filter screen holes can also adopt a shielding structure.

[0045] As shown in Figure 5, a temperature sensor 13 can be added, mounted on the air outlet duct of the heating unit 5. For precise stove temperature control, a temperature sensor is necessary. In high-temperature environments, thermocouples, infrared temperature measurement, and other methods are generally used; the figure shows a thermocouple. For controlling the air outlet temperature of the stove, it is best to install the temperature sensor 13 below the fan blades 602, as this is where the hot air converges, allowing the average value of the mixed hot air from various locations to be collected. However, installing it here is susceptible to being affected by dirt falling from the nozzle 11. Furthermore, if the fan system malfunctions and causes dry burning, the heating unit temperature cannot be sensed in a timely manner. Therefore, considering all factors, the temperature sensor 11 can be installed below the heating unit 5. The temperature difference between the temperature and the outlet temperature of the nozzle 11 can be measured through actual testing. If it is too large, it should be installed in a location with a smaller temperature difference. Of course, two temperature sensors can also be used: one to sense the outlet air temperature and the other to prevent dry burning.

[0046] As shown in FIG5 , a fan housing 4 and an air guide wheel 10 can be added. The fan housing is arranged at the lower end connecting the inner cavity and the outer cavity of the furnace cavity 3, and the fan blade 602 is arranged in the fan housing; the air guide wheel is arranged at the end of the fan housing where the air flows out, and the air guide wheel uses spokes and inclined surfaces to guide the flow of air. The fan blade 602 shown in FIG5 adopts the structure of a mixed flow fan blade, so a fan housing 4 is provided. The inclination of the fan housing is to allow the wind thrown onto it to flow into the inner cavity of the furnace cavity 3. In fact, it can also be a straight surface. This is because the axial flow plays a dominant role in the mixed flow fan blade, and the wind squeezed to the surrounding areas can be pressed forward by the closing of the tail end of the fan housing. Unlike a pure centrifugal fan blade, the wind flow direction must be changed by the curved surface of the fan housing. The fan housing 4 can be arranged on the inner wall of the furnace cavity, and can be integrally formed with the inner wall of the furnace cavity or assembled together in a separate manner; the fan housing 4 can also be arranged on the furnace cavity cover 303, and its bottom opening allows air to be inhaled; in short, the fan housing can be assembled in any manner at a position where the bottom of the inner and outer cavities are connected; the wind guide wheel 10 is installed at the end of the wind blade housing where the air is discharged in a fixed or removable manner. If a fixed and non-removable manner is adopted, the fan blades 602 must be able to be installed from the small end of the wind blade housing, which is not conducive to later cleaning. It is more reasonable to adopt a method that is easy to disassemble. The purpose of the wind guide wheel 10 is to guide the wind. The rotating wind will spread out to the surroundings under the action of centrifugal force, so that it cannot be concentrated to blow towards the center of the pot bottom. The spokes of the wind guide wheel can be used to allow the rotating wind to blow vertically upward instead, and the side of the wind guide wheel can also be made into an inclined surface to allow the wind to gather towards the center. By adjusting the inclination of this surface, the wind uniformity can be adjusted. Some inclined surfaces can also be added at specific locations to make the wind flow in a set direction. Through the wind guide wheel, it is possible to make the pot heat more evenly. FIG6 is a schematic diagram of an air guide wheel.

[0047] As shown in Figures 7 to 9, a push rod 604, a spring 605, and a nozzle 11 can also be added. The motor shaft is configured as a hollow shaft, and the spring is assembled within the hollow shaft of the motor. The nozzle is arranged outside the guide wheel and can move up and down along the axis of the fan housing. One end of the push rod is connected to the spring, and the other end is connected to the nozzle. As shown in Figure 7, the fan blade 602 is assembled on the motor shaft, and the spring 605 and push rod 604 are assembled within the motor shaft. The motor shaft is also equipped with a heat sink 603 for dissipating heat from the motor shaft. If the heat sink 603 is processed into a fan blade shape, it will drive air convection when the motor rotates, which not only dissipates heat from the motor shaft but also dissipates heat from the motor body. A shock-absorbing pad 606 can also be added to the motor 601. When the motor is installed in the furnace cavity 3, the shock-absorbing pad reduces the vibration transmitted from the motor to the stove. As shown in Figures 8 and 9, the pots 16 in these two figures vary in size. The nozzle 11 automatically adjusts its height based on the weight of the pot and the action of the spring 605 and push rod 604. This maintains a suitable distance between the nozzle and pots of varying sizes, ensuring efficient heating of the pot by the air cooker. When the nozzle is too far from the pot, airflow diffuses and, due to the Venturi effect, mixes with the cooler surrounding air, causing the air reaching the pot to cool or heat inconcentrated, thereby reducing efficiency. The end of the push rod that contacts the nozzle 11 can be ground into a spherical shape, or a small round ball, such as stainless steel or ceramic, can be added where the push rod contacts the nozzle. This minimizes friction between the nozzle and the motor 601 when it rotates, preventing the nozzle from rotating. This structure automatically adjusts the height of the nozzle 11 based on the size and shape of the pot, thereby increasing the heating efficiency of the air cooker. From the perspective of energy conservation, excluding heat loss from the insulation layer, all heat generated by the heating unit is absorbed by the pot. Therefore, efficiency should be the same regardless of the distance of the nozzle from the pot. This consideration is correct but one-sided. When the temperature of the air heating the cookware decreases, the heat transfer area and thermal conductivity remain unchanged, but the temperature difference between the inner and outer walls of the pot decreases, resulting in less heat energy absorbed by the pot. If the heating unit performs the same work, the temperature of the air sucked back from the inner cavity will increase. To maintain a consistent air temperature at the air stove nozzle, the heating unit must reduce its power, which means the air stove's firepower will decrease. Maintaining the same power heating will increase the temperature, shortening the life of the heating wire, reducing the density of the hot air, and reducing the air volume blown by the fan at the same speed. High temperature increases heat dissipation, requiring the insulation layer to be made of more heat-resistant materials, making the working environment of the fan blades even more harsh, etc., which brings a series of problems. Therefore, it is beneficial to adjust the height of the nozzle. Of course, you can also use special cookware without setting the nozzle, or you can use manual adjustment.

[0048] The four arrows in the oven cavity 3 in Figure 8 represent air flow. When a cookware is placed on the air cooker, the open end of the oven cavity is sealed by the cookware. During operation, the air within the oven cavity circulates internally. Fan blades 602 blow hot air toward the cookware. After releasing some of the heat energy to the cookware, the hot air is drawn into the outer cavity through the gap above the oven cavity. After being heated by the heating unit 5, it is blown back toward the cookware, continuing this cycle. Aside from heat loss through the insulation layer, the heat energy is absorbed and transferred only by the cookware, resulting in high efficiency. Even if the cookware and the air cooker are not properly matched and a gap exists, the loss of hot air is minimal. Any air leakage will inevitably disrupt the pressure balance in the oven cavity, creating a negative pressure, thus preventing further leakage. Experiments have shown that after the 650-degree hot air has fully heated the cookware, the temperature of the recovered air is still close to 450 degrees. Therefore, a hot air heating solution without this internal circulation structure would be extremely inefficient and unusable. As shown in Figures 2 and 5, when no pot is placed, most of the hot air is released into the air, and most of the air sucked into the outer cavity of the oven cavity 3 is cold air. However, this function can also be used for grilling, drying, etc.

[0049] As shown in Figures 8 and 9, the motor 601 is arranged on the suction side of the fan blade 602, and an suction gap is provided between the insulation layer 9 and the motor shaft through-hole and the shaft of the furnace cavity 3. When the motor 601 drives the fan blade 602 to rotate, cold air is sucked in from the suction gap to cool the shaft of the motor. Figure 9 shows two arrows at the motor shaft position, representing that cold air is drawn into the furnace cavity from here. To ensure better cooling of the shaft, a heat-insulating circular cylindrical structure is also set at the position of the motor shaft through hole in the furnace cavity cover 303. This cylindrical structure can be designed as a double layer and filled with heat-insulating material. On the one hand, it prevents hot air from directly acting on the motor shaft, and on the other hand, it guides the cold air to cool the entire length of the shaft. If the circular column is not set, the cold air will diffuse and mix with the hot air as soon as it enters the furnace cavity. The amount of cold air inhaled here is very small, less than one percent of the hot air flow rate. Therefore, as soon as it mixes, it becomes hot. The motor shaft extending into the furnace cavity cannot be cooled. If it is exposed to high temperatures for a long time, it will easily deform due to high-speed rotation, causing the fan system to fail. On the other hand, the heat transferred to the motor body through the shaft will increase, which will damage the life of the motor. At the same time, the height of the circular column can be set close to the fan blade, so that the area where the fan blade and the motor shaft meet can also be cooled, so that the connection between the fan blade and the motor is at a lower temperature, making the connection more reliable. The amount of cold air inhaled can be controlled by adjusting the gap here to achieve the desired cooling effect. In the structure shown in FIG9 , most of the air heated by the heating unit 5 will be sucked in from the outer ring of the fan blade housing. This is because the linear velocity of the blades is greater the further outward along the diameter of the fan blade, the greater the negative pressure generated by the pressure. Moreover, the hot air in this structure also flows from the outside to the center. Therefore, under the effect of these two factors, the air flow rate in the center of the fan blade is very small, so that the motor shaft only needs a small amount of cold air to be effectively cooled. This small amount of cold air hardly reduces the hot air temperature of the air stove. The reason why air can be sucked in from the outside is because of the negative pressure formed on the back of the fan blade by the rotation of the fan blade. As shown in FIG8 , while increasing the air suction gap, a heat sink can also be provided on the motor shaft to provide a better cooling and heating effect on the motor shaft. The heat sink can also be processed into the shape of a fan blade, but the direction of the wind must be towards the air suction gap, otherwise the air suction gap will not be able to be inhaled, causing a counter-effect.

[0050] Figure 10 is an exploded view of the heating unit 5, illustrating a preferred embodiment of the heating unit. The heating unit 5 comprises a heating wire 502, a heating wire coil 501, and a terminal 503. The heating wire coil is provided with a ventilation slot, within which the heating wire is mounted. One end of the terminal is electrically connected to the heating wire, while the other end passes through the furnace cavity and is connected to the control unit via a wire. The control unit 8 comprises a wind speed adjustment module and a temperature control module. As shown in the figure, the circular groove on the heating wire coil extends from front to back in the thickness direction and is provided with a latch to secure the heating wire within the groove. The heating wire is welded or crimped to the terminal. As shown in Figure 9, the terminal 503 passes through the furnace cavity cover 303 and the insulation layer 9. The contact area with the furnace cavity is covered with a high-temperature resistant insulation layer to prevent electrical leakage. The portion of the terminal exposed from the insulation layer 9 is connected to the control unit 8 via a wire. This terminal can be connected to a switching element of the control unit 8, such as a relay or thyristor. In a minimalist version, it can also be directly connected to a manual mechanical switch. The heating wire coil can be made of refractory insulating materials such as ceramic, mica, and refractory cement, with key considerations being its strength, density, specific heat capacity, and resistivity. Minimizing heat storage will result in a faster heating rate for the air stove and less residual heat after shutdown. Mica sheets offer the lightest weight and the least heat storage, but their durability and strength may not be as good as ceramics, which requires experimental verification. The heating unit 5 doesn't necessarily have to be a resistance wire solution; any material that can heat the air to an appropriate temperature and has a suitable lifespan and cost can be used, such as carbon fiber, ceramic heaters, silicon nitride heating plates, or high-frequency heating. However, considering all factors, resistance wire currently offers the best value for money. As shown in Figure 16, the air stove's operating panel features a wind speed adjustment knob 17 and a temperature adjustment knob 18. Accordingly, the control unit 8 must include modules for adjusting both temperature and wind speed, enabling dual-parameter control of the air stove. Temperature adjustment can be achieved either by directly adjusting the power or by adjusting the temperature setpoint, with the control unit automatically adjusting the power based on the temperature. The latter requires a temperature sensor. Adjustable temperature is crucial. Air stoves can precisely adjust the temperature from tens of degrees to over 650 degrees, making cooking easier and healthier. They can achieve the same taste as gas-powered cooking while reducing fumes by over 90%. For those who care more about their health, they can even achieve almost smokeless cooking by lowering the temperature. Gas stoves, on the other hand, can only adjust the power, not the temperature. Lowering the power only reduces the flame, but the area where the flame contacts the same high temperature remains hot. Therefore, even frying at the lowest power will still burn, and the center of the pan where the flame reaches will produce a lot of smoke. This can only be achieved by adding more oil and using convection to disperse the heat, but this is both oil-consuming and unhealthy.For beginners, frying an egg on a gas stove or induction cooker can easily burn, and learning to control the heat requires a lot of practice. However, with an air cooker, which offers precise temperature control, you only need to set the temperature according to the instructions, and at least you don't have to worry about burning the food. For example, when frying peanuts, just set the temperature to around 250°C, and you can achieve the same results as experienced people using traditional stoves, without even having to stir. While cooking on a gas stove requires experience to adjust the heat level according to the food's level, it's quick and easy to adjust. However, with electric and ceramic stoves, the heat storage in the stove's core and glass panel means there's a delay in adjusting the heat level. This delay is determined by the amount of heat stored, and it often takes 30 seconds or more to reach the set level. Therefore, electric and ceramic stoves can't adjust the heat level as quickly as gas or induction cookers, making it difficult to master the right level even with extensive experience. While the air cooker of the present invention also stores heat, it adjusts the heat level by adjusting the airflow, eliminating the delay associated with a gas stove. This is because the air stove is a constant temperature cooker. When the air volume is turned down or up, it automatically adjusts the power to keep the hot air at the set value. The temperature remains unchanged, but the air flow changes, and the overall heat delivered to the pot or food changes, just like adjusting the size of a gas flame. If the air stove, like a ceramic or electric stove, adjusts the heat by adjusting the power or temperature, there will also be a lag. For example, if the temperature is 650 degrees and the heat is reduced to 300 degrees, the air stove's heating element, the outer wall of the oven cavity, the oven cavity cover, and the insulation layer must all be reduced from 650 degrees to 300 degrees. The heat stored in these components can be released for a period of time, and the temperature drops slowly. Even if the power of the heating element drops to zero, the 350-degree temperature difference provided by the stored heat may be maintained for tens of seconds before the desired heat is finally reached. However, adjusting the air volume is different. Although these components also store the same amount of heat, they are in thermal equilibrium at the same temperature, and the stored heat will not be released. In extreme cases, if the fan system is turned off, stored heat will still be transferred outward. However, since the main heat storage components are separated by the inner wall 303 of the oven cavity, they rely on natural convection through multiple thermal barriers to reach the cookware. The amount of heat transferred per unit time is low, significantly different from electric stoves and ceramic stoves. If the control unit 8 only has one of the three functions of wind speed adjustment, temperature adjustment, or power adjustment, or even none of them, some of the objectives of the present invention can be achieved, but it is not comprehensive. For example, if only wind speed adjustment is available, the cooking effect can only be achieved by using a gas stove, which seriously reduces the cooking capacity of an air stove. If only power or temperature adjustment is available, there will be thermal lag, and excessive wind speed during grilling or simmering can lead to problems such as insufficient temperature and dehydration of the food. Only by being able to adjust both temperature and wind speed can the advantages of an air stove be fully utilized. While temperature and wind speed can be adjusted using buttons or a touchscreen, adjusting with a knob is faster and more user-friendly. As shown in Figure 16, the control panel includes both wind speed and temperature adjustment knobs.

[0051] As shown in Figures 3 to 9, the furnace cavity includes an inner wall 301, an outer wall 302, and a cover 303; the inner wall of the furnace cavity constitutes the inner cavity of the furnace cavity, which is the space for the air stove to heat pots or food; the inner wall of the furnace cavity, the outer wall of the furnace cavity and the cover together constitute the outer cavity of the furnace cavity, and the heating unit 5 is arranged in the outer cavity; the inner wall of the furnace cavity is connected to the top and bottom of the outer wall of the furnace cavity; it also includes a fan shell and an air guide wheel, the fan shell is arranged on the inner wall of the furnace cavity or the furnace cavity cover, the fan blade is arranged in the fan shell, and the air guide wheel is arranged on the air outlet side of the fan shell; the furnace cavity cover is arranged at the bottom of the furnace cavity, the motor is installed on the furnace cavity cover, and the motor shaft is connected to the fan blade after passing through the insulation layer and the furnace cavity cover; it also includes a temperature sensor 13, which is installed on the air outlet channel of the heating unit. As shown in FIG3 , the conical surface formed by the inner wall 301 of the oven cavity is the inner cavity. Both ends of the inner cavity are open. The large end is used to place the pot, and the small end is connected to the outer cavity, so that the hot space in the outer cavity can enter. The inner cavity can also be in the shape of a cylinder or a ladder, but the conical surface has a higher space utilization rate. When the space for placing the pot is satisfied, more space can be left for the outer cavity, and there is more space for installing the heating unit. In conjunction with FIG8 , the hot air flow is sprayed into the inner cavity from the nozzle 11 to heat the pot 16 or food placed on the inner cavity. The sunken inner cavity can hold round-bottomed pots and can also accommodate ingredients for baking, such as sweet potatoes, potatoes, etc.; if only flat-bottomed pots are considered, the inner cavity is deliberately set shallow so that it does not look like a cavity. However, as long as the pot is set up, the hot air sprayed on the pot is sucked back into the outer cavity of the oven cavity through the fan system, and the cycle works in this way. It also fully falls within the scope of protection of the present invention. There must be a certain volume of space between the wind blown by the fan 602 and the pot, which can be regarded as an inner cavity, but it is very shallow. Except for the inner cavity space in Figure 3, everything else belongs to the outer cavity. It is a space surrounded by the inner wall of the oven cavity, the outer wall of the oven cavity and the oven cavity cover. The outer cavity is connected to the top and bottom of the inner cavity, as indicated by the arrows in Figure 3, so that the hot air can circulate in these two cavities. The structures and installations of the fan housing, the guide wheel, the motor and the fan blades have been introduced above and will not be repeated here.

[0052] As shown in Figures 4 and 11, an inner cavity drain pipe 304, an outer cavity drain pipe 305, and a one-way drainage device 14 can also be added; the inner cavity drain pipe is arranged on the inner wall 301 of the furnace cavity, and the outer cavity drain pipe 305 is arranged on the furnace cavity cover 303. The inner cavity drain pipe uses the space in the outer cavity drain pipe to drain water; the one-way drainage device is arranged on the water outlet channel of the outer cavity drain pipe to prevent large amounts of air from being sucked into the outer cavity drain pipe. As shown in Figure 4, a circular groove is formed between the inner cavity wall 301 and the fan housing. When the air guide wheel and nozzle are installed, the depth of this groove increases. The inner cavity drain pipe 304 is arranged at the bottom of this groove to facilitate drainage. The outer cavity water drain pipe 305 is also arranged at the bottom of the furnace cavity cover. To reduce the space occupied by the drain pipe and the number of drainage outlets, the outlet of the inner cavity drain pipe 304 is directly opposite the water inlet of the outer cavity drain pipe, and water from the inner cavity drain pipe is discharged through the outer cavity drain pipe. When the air stove is working, the water inlet of the outer cavity drain pipe is in a negative pressure state. Hot air will not overflow from the drain pipe, but cold air will be sucked in from the outside when in a negative pressure state. Therefore, a one-way drain device 14 is set on the water outlet channel of the outer cavity drain pipe. The one-way drain device in Figure 11 is a thin piece that can rotate around an axis. It is in a vertical state under the action of gravity. The drain port is closed. Even if the seal is not tight, only a small amount of air can be sucked in from here, which has no effect on the air stove. When water is discharged, the one-way drain device 14 opens to drain water under the dual action of the kinetic energy of the water flow and the potential energy of gravity. The one-way drain device can be other one-way valve structures, but it requires a small opening force and a large opening space. For example, a one-way diaphragm valve is feasible. A filter can also be set at the entrance of the inner cavity drain pipe 304 to prevent large particles of debris from entering.

[0053] As shown in Figures 9, 12, and 13, a feasible housing and cooling structure are provided. The housing comprises an upper shell 1 and a bottom cover 2. The bottom cover is provided with a ventilation slot 201, one end of which is provided with an exhaust hole 202. When the upper shell and bottom cover are assembled, the motor is positioned within the ventilation slot. The bottom cover also has an air inlet 203, positioned so that air entering the housing flows through the control unit 8. The housing also includes a cooling fan 7, whose air intake 701 communicates with the space where the control unit is located, and whose air outlet 702 communicates with the ventilation slot 201 in the bottom cover. As shown in Figure 13, the raised ventilation slot on the bottom cover 2 is designed, on the one hand, to reduce the thickness of the entire cooktop for a better visual effect, and on the other hand, to centralize the wind power of the cooling fan 7 to cool the motor 601. For high-power induction cooktops or ceramic cooktops, two or more cooling fans are often used to cool the interior of the cooktop. This approach simply aims to increase the air flow within the cooktop, without rationally planning the cooling air path. In fact, it is only necessary to cool the components that the user needs to touch, such as the operation panel, control unit, power supply, and motor. If the air flow path can be planned well, only one cooling fan is needed. The cooling fan can use an axial fan, but due to the obstruction of internal parts, a centrifugal turbofan is used, which is more efficient, has greater wind pressure, and can change the direction of air flow. As shown in Figure 12, the air intake 701 of the cooling fan 7 is located in the space where the control unit 8 and power supply 12 are located. Since hot air has a lower density and will rise, the air intake is extended to the top of the space to effectively absorb the hot air in the entire space. The bottom cover 2 is provided with an air inlet 203 at the location of the control unit 8 and power supply 12. The location of the air inlet is preferably concentrated at the location of the heat sink and the components with high heat generation. The cold air from the outside is sucked in from here, cooling the electronic components immediately. It is then sucked in by the cooling fan 7 and blown towards the motor 601, and then discharged from the exhaust 202 of the bottom cover ventilation slot. This structure prioritizes cooling locations, clarifies the cooling airflow path, and arranges for component cooling based on their characteristics. For example, if a motor requires concentrated cooling with a higher air velocity, it is placed near the cooling fan's outlet. This structure reduces the need for cooling fans and offers considerable practical value.

[0054] Figure 1 is an exploded view of the air stove, in which you can see the three-dimensional effect of each major component. This figure is helpful for understanding the structure of the air stove. Example 2

[0055] As shown in Figure 14, fan blades 602 are installed in the outer cavity of the furnace chamber 3, on the air inlet side of the heating unit 5. The fan blades blow air toward the heating unit, which is heated by the heating unit and then ejected from the bottom of the inner cavity of the furnace chamber. This fan blade structure has a large outer diameter, which can achieve high air volume at low rotation speeds, which is beneficial for both noise reduction and motor life. As shown in Figure 14, the central disk connecting the fan blade to the motor blocks the path of airflow to the inner cavity, so holes are required in the fan blade center disk to connect the spokes. However, at high speeds, the spokes become a single entity. For example, a ping-pong ball can pass through the gap between the fan blades when it is stationary, but once the fan starts rotating, it cannot pass through unless it is spinning at a high enough speed. Air molecules are like small balls, and they can only partially pass through when the wind speed is high enough. This creates a contradiction: to increase the wind speed, the rotation speed of the fan blade 602 must be increased. As the rotation speed increases, the spokes of the central disk also rotate faster, and the air needs to move faster to partially pass through. The two effects cancel each other out, rendering the fan useless. Therefore, the structure in Figure 14 is just a schematic diagram, used to illustrate that the fan blades can also be installed in the outer cavity. In order to avoid the above situation, the fan blades can be designed into a cup shape, and the fan blades are distributed circumferentially inside the cup wall. The heating unit 5 is also installed in the cup, which avoids the above problem. The power connection line of the heating unit can be led out along the inner wall of the furnace cavity to avoid the rotating fan blades. Figure 14 does not have a fan blade shell or a nozzle. It is only necessary to set holes for ventilation at the bottom of the inner wall of the furnace cavity. Mesh holes can also be set to prevent large particles from falling into the outer cavity. The features of Example 1 that do not conflict with the fan blade installation method of this embodiment can be adopted in this embodiment. Example 3

[0056] As shown in Figure 15, the arrows indicate the flow of air within the oven cavity 3. Unlike the previous two embodiments, where hot air is ejected from the bottom of the oven cavity 3, in this embodiment, hot air is ejected from the top of the cavity. After completing heat exchange with the cookware, the hot air is drawn into the outer cavity from the bottom of the cavity. An air outlet is provided on the upper portion of the oven cavity inner wall 301. To prevent water from entering, the outlet is positioned vertically. For more effective waterproofing, an extended shield can be provided at the top, as shown in Figures 2, 8, and 9. The extended slope of the upper shell 1, where the cookware is placed, shields the gap above the oven cavity 3. The advantage of this embodiment is that the air flow direction aligns with its natural convection direction. For example, after being heated by the heating unit 5, the temperature increases, the density decreases, and the air flows upward. After being ejected into the cavity and exchanging heat with the cookware, the temperature decreases, the density increases, and the air sinks downward. Since this conforms to the direction of natural convection, the fan blades 602 do not need to perform additional work to overcome the forces of natural convection, but instead increase the force driving the air flow. However, this structure may result in the temperature at the center of the pot being lower than the edge temperature. However, this can be improved by adjusting the position and direction of the air outlet of the oven cavity. In addition, this problem is not a big problem in some commercial stoves. For example, in a cafeteria, when cooking large amounts of food in a large pot, a high edge temperature becomes an advantage. If the edge temperature is low, the force and frequency of stir-frying need to be increased to heat the food evenly. Therefore, this method has practical value in certain specific occasions, and by improving the air outlet, the heating effect in Example 1 may also be achieved.

[0057] Figure 15 illustrates an axial-flow fan structure. A centrifugal fan can also be used, with the centrifugal fan's blade housing connected to the bottom of the furnace's inner wall. For example, if the disc-shaped heating unit is used, and the centrifugal fan's outlet is directed directly at the heating unit, it will be difficult to provide uniform airflow to the heating unit due to the large area of ​​the heating unit and the small area of ​​the fan's outlet. Therefore, the centrifugal fan's outlet can be directed away from the heating unit. Instead, it can apply pressure to the furnace's outer cavity to ensure a more uniform flow of air through the heating unit. Due to the centrifugal fan's high outlet pressure, sufficient pressure can be provided throughout the outer cavity. If the heating unit's area is reduced and the large disc-shaped structure is not used, the air can be directed directly at the heating unit when its frontal area is similar to that of the centrifugal fan's outlet. Both axial-flow and centrifugal fans are mature technologies, so the illustration of the centrifugal fan scheme is omitted.

[0058] Unless otherwise specified, the structures and solutions in Example 1 can be adopted in this embodiment. For example, while the guide wheel, nozzle, and nozzle extension and lowering features in Example 1 do not conflict, their use in this fan blade structure will not provide beneficial effects. However, the furnace cavity manufacturing method, heating unit, control unit, motor cooling, and other features can all be implemented using the same solutions and will not be further elaborated here.

[0059] The above embodiments are not exhaustive of all structures and methods. The combination of all the above solutions and any solution that can be easily thought of through the present invention are all within the protection scope of the present invention.

Claims

1. An air stove, comprising a housing, a heating unit (5), a control unit (8), and a heat insulation layer (9), characterized in that: It also comprises a furnace cavity (3) and a fan system (6), wherein the furnace cavity is divided into an inner cavity and an outer cavity, at least two cavities connected at both ends; the fan system comprises a motor (601) and a fan blade (602), wherein the fan blade is arranged in the furnace cavity, the motor is arranged outside the heat insulation layer (9), and the fan blade is connected to the shaft of the motor; the heating unit (5) is arranged in the outer cavity of the furnace cavity; the fan system inhales air from one end of the furnace cavity, and the air flows through the heating unit and then enters the inner cavity of the furnace cavity from the other end.

2. An air cooker according to claim 1, characterized in that: The furnace cavity (3) comprises a furnace cavity inner wall (301), a furnace cavity outer wall (302), and a furnace cavity cover (303); any two of the furnace cavity inner wall, furnace cavity outer wall, and furnace cavity cover may form a whole and then be assembled with a third part to form a furnace cavity; or each of them may be an independent part and the three may be assembled together to form a furnace cavity.

3. An air cooker according to claim 1, characterized in that: It also includes a temperature sensor (13), which is installed on the air outlet channel of the heating unit (5).

4. The air cooker according to claim 1, characterized in that: It also includes a fan blade shell (4) and an air guide wheel (10), wherein the fan blade shell is arranged at the lower end connecting the inner cavity and the outer cavity of the furnace cavity (3), and the fan blade (602) is arranged in the fan blade shell (4); the air guide wheel is arranged at the end of the fan blade shell where air is discharged, and the air guide wheel uses spokes and inclined surfaces to guide the flow of air.

5. An air cooker according to claim 4, characterized in that: It also includes a push rod (604), a spring (605), and a nozzle (11); the shaft of the motor (601) is arranged as a hollow shaft, and the spring is assembled in the hollow shaft of the motor; the nozzle is arranged outside the wind guide wheel (10), and the nozzle can move up and down along the axis direction of the wind blade shell; one end of the push rod is connected to the spring, and the other end is connected to the nozzle.

6. An air cooker according to any one of claims 1 to 5, characterized in that: The motor (601) is arranged on the air suction side of the fan blade (602), and an air suction gap is arranged between the motor shaft through hole and the shaft of the heat insulation layer (9) and the furnace cavity (3); when the motor drives the fan blade to rotate, cold air is sucked in from the air suction gap to cool the shaft of the motor (601).

7. An air cooker according to any one of claims 1 to 5, characterized in that: The heating unit comprises a heating wire (502), a heating wire coil frame (501), and a terminal (503); the heating wire coil frame is provided with a ventilation slot, and the heating wire is installed in the ventilation slot; one end of the terminal (503) is connected to the heating wire by means of conduction, and the other end passes through the furnace cavity and is connected to the control unit (8) by means of a wire; the control unit 8 comprises a wind force adjustment module and a temperature control module.

8. The air cooker according to claim 1, characterized in that: The furnace cavity (3) comprises a furnace cavity inner wall (301), a furnace cavity outer wall (302), and a furnace cavity cover (303); the furnace cavity inner wall constitutes the inner cavity of the furnace cavity, and the inner cavity is a space for the air stove to heat pots or food; the furnace cavity inner wall, the furnace cavity outer wall, and the furnace cavity cover together constitute the outer cavity of the furnace cavity (3), and the heating unit (5) is arranged in the outer cavity; the furnace cavity inner wall is connected to the top and bottom of the furnace cavity outer wall; it also comprises a fan shell (4) and an air guide wheel (10); the fan shell is arranged on the furnace cavity inner wall or the furnace cavity cover, the fan blade (602) is arranged in the fan shell, and the air guide wheel is arranged on the air outlet side of the fan shell; the furnace cavity cover is arranged at the bottom of the furnace cavity, the motor (601) is installed on the furnace cavity cover, and the motor shaft passes through the heat insulation layer (9) and the furnace cavity cover and is connected to the fan blade (602); it also comprises a temperature sensor (13), and the temperature sensor is installed on the air outlet channel of the heating unit (5).

9. An air cooker according to claim 8, characterized in that: It also includes an inner cavity drainage pipe (304), an outer cavity drainage pipe (305), and a one-way drainage device (14); the inner cavity drainage pipe is arranged on the inner wall of the furnace cavity, the outer cavity drainage pipe is arranged on the furnace cavity cover, and the inner cavity drainage pipe uses the space of the outer cavity drainage pipe to drain water; the one-way drainage device (14) is arranged on the water outlet channel of the outer cavity drainage pipe to prevent excessive air from being sucked in from the outer cavity drainage pipe.

10. The air cooker according to claim 1, characterized in that: The housing comprises an upper housing (1) and a bottom cover (2), wherein the bottom cover is provided with a ventilation slot (201), one end of the ventilation slot is provided with an exhaust hole (202), and after the upper housing and the bottom cover are assembled, the motor (601) is located in the ventilation slot; the bottom cover is also provided with an air inlet hole (203), the position of the air inlet hole allows the air entering the housing to flow through the control unit (8); and the housing also comprises a cooling fan (7), the air intake port (701) of the cooling fan is connected to the space where the control unit (8) is located, and the air outlet (702) of the cooling fan is connected to the ventilation slot of the bottom cover.

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