WO2025086996A1 - Air stove - Google Patents

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

The invention belongs to the field of stoves, in particular to an electric stove.

Background Art

The existing stoves still have some shortcomings. Gas stoves have single functions, high flame temperature, easy cracking of oil, easy burning of food, and even if the fire is turned down, only 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 avoid burning, so gas stoves actually lead to unhealthy cooking; because they need to be connected to a gas source, they are fixed in position and inconvenient to move and use; there are also safety hazards such as exhaust gas, flameout, gas leakage, and fire caused by high-temperature open flames, especially when used by the elderly and children. Nearly half of the heat energy of the gas stove is not absorbed by the pot but directly dissipated into the surrounding environment, which is inefficient and causes energy waste. It is very hot to cook in summer; in places where there is no pipeline natural gas, the cost of using bottled gas is high and the safety hazard is great; the firepower of the natural gas stove is limited by the pipeline pressure, and when there are too many users at the same time, the firepower is not strong enough; but even with so many problems, the gas stove is still the most widely used stove in current cooking, because the current electric stoves have more problems. For example, the most popular induction cooker among electric stoves is not only picky about the pot, but also because the iron body directly heats up, the temperature rises too quickly, making it difficult to control the pot temperature, and it is very easy to burn the pot. At the same power, the oil smoke is much larger than that of a gas stove, and the cooking is not tasty and unhealthy; the function of the induction cooker is also very simple like that of a gas stove. The electric ceramic stove is just a piece of glass covered on an ordinary electric stove. Except for being safer than an electric stove, it is worse than an ordinary electric stove in other aspects. It heats up slowly, has a large heat storage, is inefficient, and the panel is easy to burn people and may also burst. The above are their respective problems. Their common problem is that they cannot accurately control the temperature of the pot, resulting in high technical requirements for individuals to master the heat, and cooking is not healthy enough. The single function leads to too many kitchen appliances causing congestion and waste.

Technical issues

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

Technical Solutions

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

The objective of the present invention is achieved through the following technical solutions:

An air stove comprises an outer shell, a heating unit, a control unit, a heat insulation layer, a furnace cavity and a fan system, wherein 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 comprises a motor and a fan blade, wherein the fan blade is arranged in the furnace cavity, the motor is arranged outside the heat insulation layer, and the fan blade is connected to the shaft of the motor; the heating unit 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.

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, the furnace cavity outer wall, and the furnace cavity cover can form a whole and then be assembled with a third part to form the furnace cavity; or each of them can be an independent part, and the three can be assembled together to form the furnace cavity.

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

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 blade is arranged in the fan blade shell; the air guide wheel is arranged at the end of the fan blade shell where air flows out, and the air guide wheel uses spokes and inclined surfaces to guide the flow of air.

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 wind guide wheel, 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.

Optionally, the motor is arranged on the air suction side of the fan blade, and an air suction gap is arranged 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 air suction gap to cool the shaft of the motor.

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 force adjustment module and a temperature control module.

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 is connected to the fan blade after passing through the heat insulation layer and the furnace cavity cover; it also includes a temperature sensor, and the temperature sensor is installed on the air outlet channel of the heating unit.

Optionally, it also includes an inner cavity drain pipe, an outer cavity drain pipe, and a one-way drain 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 drain 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.

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 hole, and the position of the air inlet hole allows the air entering the shell to flow through the control unit; it also includes a cooling fan, the air intake port 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

An air stove of the present invention can achieve one or more of the following beneficial effects: utilizing hot air heating and waste heat recovery to achieve the same fire-filled pot cooking effect as a gas stove and achieve energy-saving effects close to those of an induction cooker; achieving precise temperature control, uniform temperature, non-sticky pots, and less oil smoke, making cooking healthier and simpler; not picky about pots and pans, and better practicality; and being able to realize part or all of the functions of a series of household appliances such as ovens, air fryers, electric grills, and teppanyaki.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described below with reference to the accompanying drawings and embodiments.

Figure 1 is an explosion diagram of an air stove

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

Figure 3 is a cross-sectional view of a furnace

Figure 4 is a furnace cross-section diagram 2

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

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

Figure 7 is a schematic diagram of the fan system structure

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

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

Figure 10 is an exploded view of a heating unit

Figure 11 is a schematic diagram of the drainage pipe structure

Figure 12 is a schematic diagram of a cross-section cooling of an air stove

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

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

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

Figure 16 is an appearance diagram of an air stove

In the figure:

Upper shell 2. Bottom cover 201. Ventilation slot 202. Exhaust hole 203. Air inlet 3. Furnace cavity 301. Inner wall of furnace cavity 302. Outer wall of furnace cavity 303. Furnace cavity cover 304. Inner cavity drain pipe 305. Outer cavity drain pipe 306. Filter 307. Corner piece 4. Fan blade 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 pad 7. Cooling fan 701. Air inlet 702. Air outlet 8. Control unit 9. Insulation layer 10. Air guide wheel 11. Nozzle 12. Power supply 13. Temperature sensor 14. One-way drainage device 15. Sealing ring 16. Cookware 17. Wind speed adjustment knob 18. Temperature adjustment knob.

Best Mode for Carrying Out the Invention

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

Embodiment 1

An air stove comprises an outer shell, a heating unit 5, a control unit 8, an insulation layer 9, and also comprises a furnace cavity 3 and a fan system, wherein 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 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 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 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.

As shown in Figures 2, 3 and 1, the shell of the air stove is composed of an upper shell 1 and a bottom cover 2. This is a shell structure form of a single stove. If the air stove of the present invention except the upper shell and the bottom cover is installed in other stoves, the structure that supports and isolates the stove can be regarded as the shell. For example, if the present invention is used to transform into a heating table, the tabletop is the shell. If the present invention is integrated into an integrated stove, the shell of the integrated stove is the shell. The furnace cavity 3 shown in Figures 2 and 3 is barrel-shaped, with one end open for placing pots and pans, and is divided into two spaces connected at both ends of the inner cavity and the outer cavity, so as to realize the cold and hot circulation of air in the furnace cavity, and also realize the electrical safety isolation of the heating unit 5; of course, there is also the function of thermal isolation, which prevents the heating unit 5, the furnace cavity 3, the heat insulation layer 9, etc. from directly heating the pots through air convection and radiation after heat storage, causing a delay in adjusting the firepower. This will not be explained in detail here, and will be introduced in detail later. The furnace cavity 3 shown in FIG. 2 and FIG. 3 has a conical space as the inner cavity and an outer cavity outside the conical space, which is a concentric structure in which the outer cavity surrounds the inner cavity; or two or more cavities may adopt a parallel structure, one or more inner cavities are used to place pots, one or more outer cavities are used to place heating units, and the inner cavity and the outer cavity are connected at both ends, so that after the pot is placed to seal the furnace cavity opening, the air circulates between the inner cavity and the outer cavity of the furnace cavity. The cavity where the pot is placed is regarded as the inner cavity, and the other cavities are the outer cavities, because the opening where the pot is placed is generally the center of the stove, the center is the inner cavity, and the periphery is the outer cavity. The arrows in FIG. 3 indicate how the air circulates between the inner and outer cavities of the furnace cavity. This circulation is also an effect that can only be achieved when the pot is placed. If the pot is not placed, as shown by the arrows in FIG. 2, most of the hot air will be released into the atmosphere, and most of the cold air inhaled by the furnace cavity is the outside. As long as there are two cavities connected at both ends, whether it is a concentric structure or a parallel structure, the function can be achieved, but there can also be multiple cavities, such as in the case of multiple heating units or multiple stove eyes.

Since the working temperature of the furnace cavity is high, the bottom and the side are wrapped with an insulation layer 9. The insulation layer can be made of refractory insulation materials such as glass wool and rock wool. If household products require to be small and exquisite, nano-aerogel materials with lower thermal conductivity can be used, such as silica nano-aerogel felt. The insulation layer can be thinner, making the appearance of the air stove thinner and more exquisite; of course, vacuum insulation is used, the effect is better and the size is thinner, but the vacuum is easy to lose vacuum and fail. The heating unit 5 is assembled in the outer cavity of the furnace cavity 3, mainly for safety considerations. It is electrically isolated by the inner wall 301 of the furnace cavity. The user cannot touch the position where it is installed, and even children cannot touch it with iron wire. Soup cannot pour into the furnace cavity. Of course, installing it in the outer cavity also solves the problem of heat storage causing the temperature lag of the pot. Cookers such as electric stoves and electric ceramic stoves cannot quickly adjust the temperature like gas stoves, which is caused by the direct action of the heat storage of the heating unit on the pot. 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 has less residual heat after shutdown.

The fan system must at least include a motor 601 and a fan blade 602 to achieve its function. In FIG2 , the fan blade 602 is mounted on the throat where the inner cavity of the furnace cavity is connected to the bottom of the outer cavity. The motor 601 is installed outside the heat insulation layer 9 to isolate it from the furnace cavity. The shaft of the motor 601 passes through the heat insulation layer and the furnace cavity and is connected to the fan blade 602. In FIG2 , the motor is installed at the bottom of the furnace cavity, coaxial with the fan blade. This is a simple and space-saving installation method. The motor can also be installed on the side wall of the furnace cavity to transmit torque to the fan blade through gears, chains or belts. The arrow in FIG2 is an air flow indicator when there is no pot placed on the air stove. At this time, the air blown by the fan blade 602 is dispersed into the atmosphere. If a pot is placed, the opening on the furnace cavity will be sealed. As indicated by the arrow in FIG8 or FIG3, the air circulates inside the furnace cavity. In addition to the heat dissipation of the heat insulation layer and the heat storage loss of the air stove, the heat energy will be fully transferred to the pot, which is much more energy-saving than the gas stove. If the heat insulation layer is well insulated, the weight of the furnace cavity, the heating unit, the fan blade and other heat storage parts is as light as possible, and the efficiency of the air stove will be comparable to that of the electromagnetic stove. As shown in FIG2, the motor 601 drives the fan blade 602 to rotate, blowing air into the inner cavity of the furnace cavity 3, thereby forming a negative pressure in the outer cavity of the furnace cavity, and the air is sucked from the gap between the inner and outer cavities. The sucked air passes through the heating unit 5. If the heating unit 5 is outside the working state, the air flowing through will be heated, and the hot air is blown into the inner cavity by the fan blade, so that the hot air is used as a medium for heating. The motor 601 and the heating unit 5 are controlled by the control unit 8. The control unit 8 may be a circuit board including a variety of electronic components, which can realize the control of parameters such as the motor speed, the heating unit power, and the temperature of the furnace cavity; the control unit 8 may also be only one or more mechanical switches, and the switch is used to manually control the power on and off of the heating unit 5 and the motor. Even if the control unit 8 is a simple form of a mechanical switch, since 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 the gas stove fire pot, with high heat transfer efficiency and uniform temperature. Its safety and use effect are much higher than those of electric stoves, and the use effect is also much better than that of electric ceramic stoves and induction cookers. Compared with the two, it is not picky about the shape and material of the pot.

The structure shown in Figure 1 can realize the basic functions of the 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 shaft of the motor is long enough, the heat transferred from the fan blades to the motor will be dissipated 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, so that there is no problem even if the motor is not cooled. There is no temperature sensor. It only needs to match the power of the heating unit with the air volume of the fan blade. In case the heat load of the heating wire is too large, it will just burn out, and will not cause danger to the user and the surrounding environment.

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

As shown in FIG3 , a schematic diagram of a furnace cavity cross section is provided, which provides a more 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 them can be an independent part, and the three can be assembled together to form a furnace cavity. The space surrounded by the furnace cavity inner wall 301 alone is the inner cavity, and the space surrounded 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 the furnace cavity outer wall can be formed by rolling up metal sheets and welding, or by stretching or extrusion, or by casting or extrusion of refractory insulating materials such as clay, refractory clay, and refractory cement, forming at least two cavities connected at both ends. The inner cavity is a space for heating pots or food, and the outer cavity is used to place heating elements and other related elements. 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 operation of the fan system mainly uses natural convection heat transfer, and the heating efficiency is extremely low across several layers of thermal barriers. It can be used for stewing sweet potatoes, keeping warm, and other purposes that require low firepower. The inner wall of the furnace cavity and the outer wall of the furnace cavity can be connected together to form a part, and can be integrally formed, such as by extrusion or casting of refractory materials, by stretching and stamping of metal plates, or by welding. As shown in FIG14, the inner wall of the furnace cavity and the outer wall of the furnace cavity are welded together through multiple corner pieces 307 to form a part; this part can be connected to the furnace cavity cover by screws, and the convex edge in the figure is the position of the locking screw, but it can also be provided by setting a screw column without the convex edge, or by riveting and other schemes. The outer wall of the furnace cavity can also be connected with the furnace cavity cover to form a zero body, as shown in FIG4 and FIG15, at this time, the two are a part, and the furnace cavity cover at this time is actually the bottom of the part, not the cover in the traditional sense. Since there are many ways to achieve the purpose of the present invention, it is inevitable to contradict, so it is not limited to the name, and the process of connecting the outer wall of the furnace cavity and the furnace cavity cover together is the same as above. The inner wall of the furnace cavity 301 can also be combined with the furnace cavity cover 303. In this combination mode, the motor and the fan blade shell are the same as the furnace cavity cover, which can ensure their concentricity. Of course, these three can also be independent parts assembled together to form a 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 is not required. The fan housing is only a necessary structure in the centrifugal fan or mixed flow fan structure.

From the perspective of reducing heat storage to increase the heating rate of the air stove and reducing heat storage loss, it is most appropriate to use thin-walled metal materials to make the furnace cavity 3. For example, the inner wall and outer wall of the furnace cavity can be made of 0.25 thick stainless steel material. Some concave and convex shapes can be stamped to increase strength, and even thinner stainless steel can be used. Since the furnace cavity cover 303 needs to install a motor, a certain strength and rigidity are required, so a 0.5 thick stainless steel sheet can be stamped and formed, and the strength can be improved by stamping reinforcement ribs. Stainless steel materials maintain good mechanical properties and corrosion resistance below 800 degrees. It is a preferred solution for manufacturing furnace cavities with light weight, less heat storage, long life, low price, and simple processing technology. As shown in the furnace cavity cross-sectional view of Figure 4, a filter screen 306 is provided in the passage connecting the inner cavity of the furnace cavity and the upper end of the outer cavity. The filter screen may 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 to prevent children from reaching in with wire from here and touching the heating unit 5. The filter screen holes may also adopt a shielding structure.

As shown in FIG5 , a temperature sensor 13 can be added, and the temperature sensor is installed on the air outlet channel of the heating unit 5. If the stove is to be accurately controlled in temperature, a temperature sensor needs to be added. In such a high temperature environment, thermocouples, infrared temperature measurement and the like can generally be used. The figure shows a thermocouple. Considering the air outlet temperature of the air stove, it is better to install the temperature sensor 13 under the fan blade 602, because this is where the hot air converges, and the average value of the hot air mixed at various places can be collected. However, if it is installed here, it is easily affected by the dirt falling from the nozzle 11 on the one hand, and on the other hand, when the fan system fails and dry burning occurs, the temperature of the heating unit cannot be sensed in time. Therefore, considering comprehensively, the temperature sensor 11 can be installed under the heating unit 5, and the temperature difference with the air outlet temperature of the nozzle 11 can be measured through actual testing. If it is too large, it needs to be set at a position with a smaller temperature difference. Of course, two temperature sensors can also be used, one to sense the temperature of the air outlet and the other to prevent dry burning.

As shown in FIG5 , a fan blade shell 4 and an air guide wheel 10 can be added. 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; the air guide wheel is arranged at the end of the fan blade shell where the air is discharged, and the air guide wheel uses spokes and inclined surfaces to guide the flow direction of the air. The fan blade 602 shown in FIG5 adopts the structure of a mixed flow fan blade, so a fan blade shell 4 is arranged. The inclination of the fan blade shell is to allow the wind thrown onto it to flow toward 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 leading role in the mixed flow fan blade, and the wind squeezed to the surroundings can be pressed forward by the closing of the tail end of the fan blade shell, unlike a pure centrifugal fan blade, which must rely on the curved surface of the fan blade shell to change the flow direction of the wind. The fan blade shell 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 split manner; the fan blade shell 4 can also be arranged on the furnace cavity cover 303, and the bottom opening thereof allows air to be inhaled; in short, the fan blade shell can be assembled in any manner at the 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 shell that is connected to the wind in a fixed or detachable manner. If a fixed non-detachable manner is adopted, the fan blade 602 must be able to be loaded from the small end of the wind blade shell, which is not conducive to later cleaning, and 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 around under the action of centrifugal force, so that it cannot be concentrated to the center of the bottom of the pot. The spokes of the wind guide wheel can be used to change the rotating wind to blow vertically upward, and the side of the wind guide wheel can also be made into an inclined plane to gather the wind toward the center. The wind uniformity can be adjusted by adjusting the inclination of this surface. Some inclined planes can also be added at specific positions to make the wind flow in the set direction. Through the wind guide wheel, it is possible to make the pot heated more evenly. FIG. 6 is a schematic diagram of an air guide wheel.

As shown in Figures 7 to 9, a push rod 604, a spring 605, and a nozzle 11 can also be added. 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 arranged outside the guide wheel, and the nozzle can move up and down along the axis direction of the fan blade shell; 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 the push rod 604 are assembled in 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 can not only dissipate heat from the motor shaft, but also dissipate heat from the motor body. A shock-absorbing pad 606 can also be added to the motor 601. When the motor is installed on the furnace cavity 3, the shock-absorbing pad reduces the vibration transmitted from the motor to the stove. As shown in FIG8 and FIG9, the sizes of the pots 16 in the two figures are different. The nozzle 11 automatically adjusts the height under the weight of the pot and the action of the spring 605 and the push rod 604, so that the nozzle and the pots of various sizes are kept at a reasonable distance, ensuring the efficiency of the air stove heating the pot. When the nozzle is too far away from the pot, the air flow diffuses and the air with a lower temperature in the surrounding area is mixed due to the Venturi effect, so that the air temperature reaching the pot is reduced or the heating is not concentrated, thereby reducing the efficiency. The end of the push rod that contacts the nozzle 11 is ground into a spherical shape, or a small round ball is added at the position where the push rod contacts the nozzle. Stainless steel or ceramic beads can be used. When the motor 601 rotates, the friction between the nozzle and the nozzle is small enough to prevent the nozzle from rotating. The function of this structure is to automatically adjust the height of the nozzle 11 according to the size and shape of the pot, which can increase the heating efficiency of the air stove. From the perspective of energy conservation, except for the heat loss of the insulation layer, the heat energy generated by the heating unit will be absorbed by the pot, so no matter whether the nozzle is far or near from the pot, the efficiency should be the same. This consideration is correct but one-sided. When the air temperature of the heating pot becomes lower, since the heat transfer area and thermal conductivity coefficient have not changed, but the temperature difference between the inner and outer walls of the pot has decreased, the heat energy absorbed by the pot will decrease. If the heating unit does the same work, it means that the temperature of the air sucked back from the inner cavity becomes higher. When the air outlet temperature of the air stove nozzle is maintained consistent, the heating unit must reduce the power, which means that the firepower of the air stove becomes smaller; if the same power is maintained for heating, the temperature will rise, shortening the life of the heating wire, making the hot air density smaller, and the air volume blown out by the fan blade at the same speed will be smaller. High temperature increases heat dissipation, so that the insulation layer must use more temperature-resistant materials, making the working environment of the fan blade worse, 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 pots without setting the nozzle, or you can use manual adjustment.

The four arrows of the furnace cavity 3 in FIG8 represent the flow of air. When a pot is placed on the air stove, the open end of the furnace cavity is sealed by the pot. At this time, when the air stove is working, the air in the furnace cavity is in an internal circulation state. The fan blade 602 blows the hot air to the pot. After the hot air releases part of the heat energy to the pot, it is sucked into the outer cavity from the gap above the furnace cavity. After being heated by the heating unit 5, it is blown to the pot again. This cycle continues. Except for the heat loss of the heat insulation layer, the heat energy can only be absorbed and transferred by the pot, and the efficiency is very high. Even if the pot and the air stove are not matched tightly and there is a gap, the loss of hot air is very small, because once there is air leakage, it will inevitably cause the pressure balance of the furnace cavity to be broken, forming a negative pressure, thereby preventing the hot air from leaking further. It has been verified by experiments that after the 650-degree hot air fully heats the pot, the temperature of the recovered air is still close to 450 degrees. Therefore, if there is no such internal circulation structure, the scheme of hot air heating will be extremely inefficient and cannot be used. As shown in FIG. 2 and FIG. 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.

As shown in Figures 8 and 9, the motor 601 is arranged on the air suction side of the fan blade 602, and an air suction gap is arranged 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 air suction gap to cool the shaft of the motor. Fig. 9 shows two arrows at the position of the motor shaft, which represent that the cold air is sucked into the furnace cavity from here. In order to ensure better cooling of the shaft, a circle of heat-insulating circular cylindrical structure is also set at the position of the motor shaft through hole of the furnace cavity cover 303. This cylindrical structure can be designed as a double layer, and the interior can be filled with heat-insulating materials. On the one hand, it prevents the hot air from directly acting on the motor shaft, and on the other hand, it guides the cold air to cool the full 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 sucked in here is very small, less than one percent of the hot air flow, so it will be hot as soon as it is mixed. The motor shaft extending into the furnace cavity cannot be cooled. It is in high temperature for a long time, and it is easy to deform at high speed, 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 this circular column can be set to be close to the fan blade, so that the area where the fan blade and the motor shaft cooperate 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 sucked in can be controlled by adjusting the gap here to achieve the required cooling effect. The structure in Fig. 9, most of the air heated by the heating unit 5 will be sucked from the outer ring of the fan blade shell, this is because the linear velocity of the blades is greater the more outward along the fan blade diameter direction, the greater the negative pressure generated by the pressure, and the hot air in the structure here also flows from the outside to the center, so under the effect of this dual factor, 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 effectively cool, and this small amount of cold air can hardly reduce the hot air temperature of the air stove. The reason why air can be sucked from the outside is because of the negative pressure formed by the fan blade rotating on the back of the fan blade. As shown in Figure 8, while increasing the air suction gap, a heat sink can also be set on the motor shaft, then the hot and cold effect of the motor shaft is better, and the heat sink can also be processed into the shape of the fan blade, but the flow direction of its wind must be towards the air suction gap, otherwise it will make the air suction gap unable to inhale air and cause counter-effect.

FIG10 is an exploded view of the heating unit 5, which provides a preferred solution of the heating unit. The heating unit 5 includes a heating wire 502, a heating wire coil rack 501, and a terminal 503. 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 method, 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 force adjustment module and a temperature control module. As shown in the figure, the annular groove on the heating wire coil rack is through the front and back in the thickness direction, and a clamp is provided to fix the heating wire in the groove, and the heating wire is welded or crimped on the terminal. As shown in FIG9, the terminal 503 passes through the furnace cavity cover 303 and the insulation layer 9, and the position where it contacts the furnace cavity has a high temperature resistant insulation layer to prevent leakage. The part of the terminal exposed from the insulation layer 9 is connected to the control unit 8 by a wire, which can be connected to the switch element of the control unit 8, such as a relay, a thyristor, etc. In the minimalist version, a manual mechanical switch can also be directly connected. The electric heating wire coil rack can be made of refractory insulating materials such as ceramics, mica, and refractory cement, and its strength, density, specific heat capacity, resistivity, etc. are mainly considered to make it store as little heat as possible, so that the air stove will heat up faster and there will be less residual heat after shutting down. The mica sheet is the lightest and has the least heat storage, but its durability and strength may not be as good as those made of ceramics, which requires experimental verification. The heating unit 5 does not necessarily have to adopt the solution of resistance wire. As long as the air can be heated to an applicable temperature and has a suitable life and cost, it can be adopted, such as carbon fiber, ceramic heater, silicon nitride heating plate, high-frequency heating, etc., but comprehensive consideration, the current price performance is the highest resistance wire. As shown in Figure 16, the operation panel of the air stove is provided with a wind force adjustment button 17 and a temperature adjustment button 18. Correspondingly, the control unit 8 must be provided with a module for adjusting temperature and wind force, so that the air stove can be controlled by two parameters. The temperature adjustment can be achieved by directly adjusting the power, and the control unit can automatically adjust the power according to the temperature by adjusting the temperature setting value, but the latter requires a temperature sensor to achieve. Adjustable temperature is very important. The air stove can adjust the temperature precisely from dozens of degrees to more than 650 degrees, which is very beneficial to various cooking conditions, making cooking simpler and healthier. It can reduce more than 90% of the oil smoke while achieving the same taste as gas cooking. For people who care more about health, they can even achieve almost smoke-free cooking by lowering the temperature. Gas stoves can only adjust the firepower but not the temperature. Turning down the firepower only makes the flame smaller. The place where the flame touches is also high temperature, so frying with the minimum firepower will also burn. The center of the pot where the flame burns is still full of oil smoke. Only by adding more oil and using convection to disperse the temperature can it be done, but it is oil-consuming and unhealthy. For beginners, using gas stoves or induction cookers, frying an egg may burn, and learning to read the fire requires a long time of practice; but air stoves with precise temperature control are different. You only need to set the temperature according to the instructions, at least you don’t have to worry about burning the dishes. For example, when frying peanuts, set the temperature to about 250, and you can achieve the effect that experienced people can achieve using traditional stoves without even frying. When cooking with a gas stove, it takes experience to adjust the firepower in time according to the heat of the food in the pot, but it reacts quickly and is easy to adjust. However, since the stove core and the glass panel of the electric stove and the electric ceramic stove store heat, there is a lag process in adjusting the firepower. The lag time is determined by the amount of heat stored in the stove, and it often takes 30 seconds or even more time to reach the set firepower. Therefore, the electric stove and the electric ceramic stove cannot adjust the firepower as quickly as the gas stove or the electromagnetic cooker. Even if you are experienced, it is not easy to master the heat of cooking. Although the air stove of the present invention also needs to store heat, it adjusts the firepower by adjusting the wind force, just like the gas stove, there is no lag. This is because the air stove is constant temperature, and when the air volume is reduced or increased, the power is automatically adjusted to keep the hot air at the set value. The temperature remains unchanged, but the air flow rate changes, and the overall heat blown to the pot or food changes, which is the same as the flame size adjustment of gas. If the air stove is like an electric ceramic stove or electric stove, and the firepower is adjusted by adjusting the power or temperature, there will be a lag. For example, if the temperature is 650 degrees now and the firepower is to be reduced to 300 degrees once it is reduced to less than half, the heating unit, the outer wall of the furnace cavity, the furnace cavity cover, the heat insulation layer, etc. of the air stove must 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 is slowly reduced. Even if the power of the heating unit is reduced to zero, the temperature difference of 350 degrees provided by the heat storage can last for tens of seconds before the desired firepower is finally achieved. However, it is different by adjusting the wind force. Although these components also store so much 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, the stored heat still needs to be transferred outward, but because the main heat storage components are separated by the inner wall 303 of the furnace cavity, they rely on natural convection through multiple thermal barriers to the pot, and the heat energy transferred per unit time is small, which is completely different from electric stoves and electric ceramic stoves. If the control unit 8 has only one of the three functions of wind force regulation, temperature regulation, and power regulation, or even none of the above functions, it can also achieve part of the purpose of the present invention, but it is not comprehensive. For example, if only the wind force can be adjusted, only the use effect of the gas stove can be achieved, which seriously reduces the cooking ability of the air stove; if only the power or temperature can be adjusted, there will be thermal lag, and when grilling or stewing, the wind force is too strong, resulting in the temperature not coming up, the food being dehydrated and dried, and other problems; only when both the temperature and the wind force can be adjusted can the advantages of the air stove be fully utilized. The temperature and wind force can be adjusted through buttons or touch screens, but it is faster to adjust through knobs, and it is more in line with user habits. As shown in Figure 16, a wind force adjustment button and a temperature adjustment button are set on the operation panel.

As shown in Figures 3 to 9, the furnace cavity includes 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 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 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 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 is connected to the fan blade after passing through the insulation layer and the furnace cavity cover; it also includes a temperature sensor 13, and the temperature sensor is installed on the air outlet channel of the heating unit. As shown in FIG3 , the conical surface surrounded by the inner wall 301 of the furnace 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 step, 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 hold ingredients for baking, such as sweet potatoes, potatoes, etc.; if only flat-bottomed pots are considered, and the inner cavity is deliberately set shallow so that it does not look like a cavity, but as long as the pot is set up, the hot air sprayed on the pot is sucked back into the outer cavity of the furnace cavity through the fan system, and the cycle works in this way, it also completely falls within the protection scope 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, which is a space surrounded by the inner wall of the furnace cavity, the outer wall of the furnace cavity and the furnace 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.

As shown in Fig. 4 and Fig. 11, an inner cavity drain pipe 304, an outer cavity drain pipe 305, and a one-way drain 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 of the outer cavity drain pipe for drainage; the one-way drain device is arranged on the water outlet channel of the outer cavity drain pipe to prevent a large amount of air from being sucked into the outer cavity drain pipe. As shown in Fig. 4, a circular groove is formed between the inner wall 301 of the furnace cavity and the fan blade shell. When the guide wheel and the nozzle are assembled, the depth of this groove increases, and the inner cavity drain pipe 304 is arranged at the bottom of this groove for easy drainage. The outer cavity water drain pipe 305 is also arranged at the bottom of the furnace cavity cover. In order to reduce the space occupied by the drain pipe and reduce the number of drainage outlets, the water outlet of the inner drain pipe 304 is directly opposite to the water inlet of the outer cavity drain pipe, and the water of the inner cavity drain pipe is discharged through the outer cavity drain pipe. When the air stove is working, the water inlet position of the outer cavity drain pipe is in a negative pressure state, and hot air will not overflow from the drain pipe, but in a negative pressure state, cold air will be sucked in from the outside, so 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 sheet that can rotate around an axis. It is in a vertical state under the action of gravity, and the drain port is closed. Even if the seal is not tight, only a trace 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 effects of the kinetic energy of the water flow and the gravitational potential energy. The one-way drain device can be other one-way valve structures, but it requires a small opening force and a large opening space, such as a one-way diaphragm valve. A filter screen can also be set at the entrance of the inner cavity drain pipe 304 to prevent large particles of debris from entering.

As shown in Fig. 9, Fig. 12 and Fig. 13, a feasible shell and cooling structure are provided. The shell includes an upper shell 1 and a bottom cover 2. The bottom cover is provided with a ventilation slot 201. One end of the ventilation slot is provided with an exhaust hole 202. After the upper shell and the bottom cover are assembled, the motor is placed in the ventilation slot; the bottom cover is also provided with an air inlet 203. The position of the air inlet allows the air entering the shell to flow through the control unit 8; and a cooling fan 7 is also provided. The air inlet 701 of the cooling fan is connected to the space where the control unit is located, and the air outlet 702 of the cooling fan is connected to the ventilation slot 201 of the bottom cover. As shown in Fig. 13, the convex shape of the ventilation slot is provided on the bottom cover 2. On the one hand, it is to reduce the thickness of the entire stove and make the visual effect better. On the other hand, it is to concentrate the wind cooling of the cooling fan 7 to cool the motor 601. For induction cookers or electric ceramic cookers with higher power, two or more cooling fans are used to cool the inside of the stove. Their approach is only to allow a larger flow of air to flow inside the stove, but there is no more scientific planning of the cold air path. In fact, it is only necessary to cool the operation panel, control unit, power supply, and motor that the user needs to touch. If the air flow path can be planned well, only a cooling fan is needed. The cooling fan can use an axial flow fan, but due to the obstruction of internal parts, a centrifugal turbo fan is used, which is more efficient, has a greater wind pressure, and can change the direction of air flow. As shown in Figure 12, the air suction port 701 of the cooling fan 7 is located in the space where the control unit 8 and the power supply 12 are located. Since the hot air density is lower and it will rise, the air suction port 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 the power supply 12. The position of the air inlet is preferably concentrated at the location of the heat sink and the components with large heat generation. The cold air from the outside is sucked in from here, and the electronic components are cooled at the first time, and then sucked in by the cooling fan 7, blown to the motor 601, and then discharged from the exhaust hole 202 of the bottom cover ventilation slot. This structure makes some trade-offs in cooling locations, clarifies the path of the cooling airflow, and makes arrangements for whether components should be cooled by suction or by blowing according to their characteristics. For example, if the location of the motor must be cooled by concentrated air with a higher flow rate, it is placed at the outlet of the cooling fan. This structure reduces the use of cooling fans and has certain practical value.

Figure 1 is an exploded view of the air stove, in which the three-dimensional effect of the main components can be seen. This figure is helpful for understanding the structure of the air stove.

Embodiment 2

As shown in Figure 14, the fan blade 602 is installed in the outer cavity of the furnace cavity 3, on the air inlet side of the heating unit 5, and the fan blade blows the air to the heating unit, and the air is ejected from the bottom of the inner cavity of the furnace cavity after being heated by the heating unit. The fan blade of this structure has a large outer diameter, and a large air volume can be achieved at a low speed, which is good for noise and motor life. As shown in Figure 14, the central disc of the fan blade connected to the motor blocks the path of the wind flow to the inner cavity, so it is necessary to open holes on the central disc of the fan blade to connect with the spokes, but when rotating at high speed, the spokes are equivalent to forming an entity, just like a fan, a table tennis ball can pass through the gap between the fan blades when it is stationary, once the fan rotates, it can no longer pass through, unless it is fast enough. Air molecules are also like small balls, and they can only partially pass through when the wind speed is fast enough. At this time, there is a contradiction. To increase the wind speed, the rotation speed of the fan blade 602 must be increased. When the rotation speed is high, the spoke rotation speed of the central disc is also faster. The air needs a faster speed to partially pass through, and the two phases offset each other, which is useless. Therefore, the structure in Figure 14 is only a schematic diagram, which is used to illustrate that the fan blades can also be installed in the outer cavity. To avoid the above situation, the fan blades can be designed to be cup-shaped, 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 has no fan blade shell and no nozzle. It is only necessary to set holes for ventilation at the bottom of the inner wall of the furnace cavity. Meshes can also be set to prevent large particles from falling into the outer cavity. The features in Example 1 that do not conflict with the fan blade installation method of this embodiment can be adopted in this embodiment.

Embodiment 3

As shown in Figure 15, the arrows in the figure are used to indicate how the air flows in the furnace cavity 3. Unlike the previous two embodiments in which the hot air is ejected from the bottom of the inner cavity of the furnace cavity 3, the hot air in this embodiment is ejected from the upper part of the inner cavity. After the hot air completes the heat exchange with the cookware, it is sucked into the outer cavity from the bottom of the inner cavity. An air outlet is opened on the upper part of the inner wall 301 of the furnace cavity. In order to prevent water from entering from here, the position where the air outlet is opened is made into a vertical surface. In order to be more effective in waterproofing, an extended shield can be set on the top, just as shown in Figures 2, 8, and 9, the extended inclined surface of the upper shell 1 where the cookware is placed covers the gap above the furnace cavity 3. The advantage of this embodiment is that the direction of air flow is consistent with the direction of its natural convection. For example, after being heated by the heating unit 5, the temperature increases, the density decreases, and the airflow flows upward; after being sprayed into the inner cavity and exchanging heat with the cookware, the temperature drops, the density increases, and the air sinks downward; in accordance with the direction of natural convection, the fan blade 602 does not need to do additional work to overcome the force of this natural convection, but instead increases the force driving the air flow. However, this structure may result in the temperature at the center of the pot being lower than the temperature at the edge. However, this can be improved by adjusting the position and direction of the air outlet of the furnace cavity. This problem is not a big problem in some commercial stoves. For example, in a cafeteria, when cooking large pots of food, the amount of food is large and the high edge temperature becomes an advantage. If the edge temperature is low, the intensity 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.

FIG15 shows the structure of an axial flow fan. A centrifugal fan can also be used. The air inlet of the centrifugal fan blade shell is connected to the bottom of the inner wall of the furnace cavity. If the disc-shaped heating unit in the figure is used, the air outlet of the centrifugal fan is blown directly. Since the heating unit area is too large and the air outlet area of the fan is small, it is impossible to provide uniform airflow to the heating unit. Therefore, the air outlet of the centrifugal fan may not be directly aimed at the heating unit, but by applying wind pressure to the outer cavity of the furnace cavity, the air flows through the heating unit more evenly. Since the air outlet pressure of the centrifugal fan is large, it can provide a sufficiently large pressure to the entire outer cavity. If the area of the heating unit is made small and this large disc-shaped structure is not used, when its windward area is not much different from the air outlet of the centrifugal fan, it can be blown directly to the heating unit. Both axial flow fans and centrifugal fans are mature technologies, so the attached figure of the centrifugal fan scheme is omitted.

In the absence of conflicts, the structures and solutions in the first embodiment can be adopted in this embodiment. For example, the guide wheel, nozzle, nozzle extension and lowering in the first embodiment do not conflict, but they cannot bring beneficial effects when used in this fan blade structure; while the manufacturing method of the furnace cavity, the heating unit, the control unit, the motor cooling and other features can adopt the same solution, which will not be repeated here.

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 (10)

An air stove comprises 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), the furnace cavity being divided into an inner cavity and an outer cavity, at least two cavities being connected at both ends; the fan system comprises a motor (601) and a fan blade (602), the fan blade being arranged in the furnace cavity, the motor being arranged outside the heat insulation layer (9), and the fan blade being connected to the shaft of the motor; the heating unit (5) being arranged in the outer cavity of the furnace cavity; the fan system inhaling 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. An air stove 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, the furnace cavity outer wall, and the furnace cavity cover can form a whole and then be assembled with a third part to form the furnace cavity; or each of them can be an independent part and the three can be assembled together to form the furnace cavity. The air stove according to claim 1, characterized in that it further comprises a temperature sensor (13), wherein the temperature sensor is installed on the air outlet passage of the heating unit (5). An air stove according to claim 1, characterized in that it also includes a fan shell (4) and an air guide wheel (10), wherein the fan 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 shell (4); the air guide wheel is arranged at the end of the fan shell where air flows out, and the air guide wheel guides the flow direction of air by using spokes and inclined surfaces. An air stove 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 set as a hollow shaft, and the spring is assembled in the hollow shaft of the motor; the nozzle is arranged outside the air 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. An air stove 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 heat insulation layer (9) and the motor shaft through hole and the shaft of the furnace cavity (3), and 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). An air stove 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 a conductive manner, and the other end passes through the furnace cavity and is connected to the control unit (8) by a wire; the control unit 8 comprises a wind force adjustment module and a temperature control module. An air stove 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 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 (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; and further comprises a fan blade The invention relates to a furnace unit comprising a housing (4) and an air guide wheel (10), wherein the air blade housing is arranged on the inner wall of the furnace cavity or on the furnace cavity cover, the air blade (602) is arranged in the air blade housing, and the air guide wheel is arranged on the air outlet side of the air blade housing; the furnace cavity cover is arranged at the bottom of the furnace cavity, the motor (601) is mounted 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 air blade (602); and further comprises a temperature sensor (13), which is mounted on the air outlet passage of the heating unit (5). An air stove according to claim 8, characterized in that it also includes an inner cavity drain pipe (304), an outer cavity drain pipe (305), and a one-way drain device (14); 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 to drain water; the one-way drain device (14) is arranged on the water outlet channel of the outer cavity drain pipe to prevent excessive air from being sucked in from the outer cavity drain pipe. An air stove according to claim 1, characterized in that: the outer shell comprises an upper shell (1) and a bottom cover (2), 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 shell 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 outer shell to flow through the control unit (8); and further 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.