An air-frying cooking machine

Abstract

This invention provides an air fryer, aiming to solve the technical problem of low heat dissipation efficiency in existing air fryers. An air fryer includes: a body with a cooking chamber and a heat dissipation chamber; a first pipe disposed within the body, containing a first air outlet channel, through which the heat dissipation chamber is connected to the outside; an air fryer assembly including a first fan for hot air heating; a second pipe surrounding the outside of the first pipe, with a second air outlet channel between them, through which the air fryer assembly is connected to the outside; the outlet end of the second air outlet channel surrounds the outside of the outlet end of the first air outlet channel, and its cross-sectional area contracts from the inlet end to the outlet end. When the airflow generated by the air fryer assembly is discharged through the second air outlet channel, the flow velocity increases and the static pressure decreases in the contracted section, forming a low pressure at the outlet end, actively drawing hot air from the heat dissipation chamber and discharging it through the first air outlet channel, thus accelerating the airflow within the heat dissipation chamber.

Description

Technical Field

[0001] This invention belongs to the field of kitchen cooking appliance technology, specifically relating to an air fryer. Background Technology

[0002] An air fryer is a kitchen appliance that uses high-speed hot air circulation to cook food. It works by generating heat through a heating element, which, combined with a fan, rapidly circulates hot air within the cooking chamber, creating a crispy surface on the food. Existing air fryers typically include a main body, a cooking chamber within the main body, and an air frying component for generating hot air.

[0003] During operation, the hot air temperature inside the cooking chamber of an air fryer typically reaches 180°C to 200°C. This high temperature is transferred to the surrounding environment through the internal structure, causing the temperature of the heat dissipation chamber containing electrical components (such as motors and circuit boards) to rise. To ensure that the electrical components operate within their normal operating temperature range, most air fryers are equipped with a cooling fan inside the machine. This fan draws in cool outside air, passes it over the heating area, and then exhausts it through the vent, thus achieving air cooling for the electrical components.

[0004] However, in existing cooling fan designs, the airflow path is mostly straight or with simple bends, which easily generates local turbulence within the machine body. This prevents the hot air in the cooling cavity from being fully and quickly expelled, resulting in low heat dissipation efficiency. As users' requirements for the power and cooking temperature of air fryers continue to increase, the heat generation of electrical components increases accordingly. The heat dissipation capacity of existing cooling structures is gradually becoming insufficient, affecting the long-term service life of electrical components and the overall reliability of the machine. Summary of the Invention

[0005] This invention provides an air fryer, which aims to solve the technical problem of low heat dissipation efficiency in existing air fryers.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An air fryer, comprising: The machine body has a cooking cavity and a heat dissipation cavity. A first pipe is installed inside the machine body, and a first air outlet channel is provided inside the first pipe. The heat dissipation cavity is connected to the outside through the first air outlet channel. An air fryer assembly, disposed within the machine body, the air fryer assembly including a first fan for heating the cooking cavity with hot air; and... The second pipe is arranged around the outside of the first pipe, and a second air outlet channel is provided between the inner side wall of the second pipe and the outer side wall of the first pipe. The air outlet end of the air blasting component is connected to the air inlet end of the second air outlet channel. The air outlet end of the second air outlet channel is arranged around the outside of the air outlet end of the first air outlet channel. The cross-sectional area of ​​the second air outlet channel gradually decreases from its air inlet end to its air outlet end.

[0007] A further embodiment: The air inlet end of the machine body near the second air outlet channel is also provided with a second fan, and the second fan blows air towards the air outlet end of the second air outlet channel.

[0008] Based on the above technical solution: the second fan continuously delivers air into the second air outlet channel, further increasing the airflow velocity within the channel. Combined with the contraction of the outlet cross-sectional area, the airflow accelerates more significantly in the contraction section, increasing the negative pressure at the outlet and correspondingly enhancing the suction force on the first air outlet channel. This combination of active air delivery and passive contraction achieves a double improvement in the exhaust velocity of the heat dissipation cavity, resulting in higher heat dissipation efficiency.

[0009] A further embodiment: the air outlets of the first air outlet channel and the second air outlet channel are both located on the rear side of the machine body.

[0010] Based on the above technical solution: the two air outlets are centrally located at the rear of the unit, ensuring that the exhaust airflow is directed in the same direction, thus preventing the airflow from spreading towards the user. At the same time, the centralized air outlet structure makes the overall appearance of the unit more streamlined.

[0011] A further embodiment: The air fryer assembly includes a heat insulation cover and a motor cover. The heat insulation cover has a hot air chamber that communicates with the cooking cavity, and the first fan is located inside the hot air chamber. The heat insulation cover is located on the upper or rear side of the cooking cavity, and the motor cover is located on the side of the heat insulation cover away from the cooking cavity. A cold air chamber is provided between the motor cover and the heat insulation cover, and the second fan is disposed in the cold air chamber; The motor cover is equipped with a motor, which is used to drive the first fan and the second fan to operate. Both the hot air chamber and the cold air chamber exhaust air outward through the second air outlet channel.

[0012] Based on the above technical solution: the hot air from the hot air chamber and the cooling air from the cold air chamber share the same second air outlet channel. The first and second fans simultaneously supply air into the second air outlet channel, and the merging of the two airflows increases the total air volume within the channel. With the cross-sectional area of ​​the second air outlet channel contracting, the increased total air volume further enhances the airflow velocity in the contracting section. According to the Venturi effect, the faster the velocity, the lower the static pressure, resulting in a larger negative pressure between the outlet of the first air outlet channel and the heat dissipation chamber, strengthening the suction effect and thus more efficiently extracting the hot air from the heat dissipation chamber. Simultaneously, the cooling air discharged from the cold air chamber is at a lower temperature than the hot air directly discharged from the hot air chamber. After mixing in the second air outlet channel, the temperature of the mixed airflow discharged from the outlet is lower than the temperature of the hot air discharged alone.

[0013] A further embodiment: the shafts of the first fan and the second fan are perpendicular to each other; the first fan is coaxially mounted on the output shaft of the motor; a transmission assembly is provided between the motor and the second fan, and the motor drives the second fan to operate through the transmission assembly; Alternatively, the first fan and the second fan are coaxially mounted on the output shaft of the motor.

[0014] Based on the above technical solutions: both layout methods use the same motor to drive two fans, eliminating the need for a separate motor for the second fan and reducing the number of components. The most compact layout can be selected based on the internal space of the machine.

[0015] A further solution: When the shafts of the first fan and the second fan are perpendicular to each other, a second fan mounting part is provided on the upper side of the heat insulation cover, and the second fan is rotatably mounted on the second fan mounting part; The transmission assembly includes a first engagement part disposed on the output shaft of the motor and a second engagement part coaxial with the shaft of the second fan. The first engagement part and the second engagement part are driven by helical gear meshing.

[0016] Based on the above technical solution: the rotation direction of the motor is converted to the rotation direction required by the second fan by the helical gear meshing, so as to realize the power transmission and enable the second fan to blow air directly towards the second air outlet channel, thereby increasing the exhaust efficiency of the second air outlet channel. This results in a stronger Venturi effect at the air outlet ends of the second and first air outlet channels, a larger negative pressure value at the air outlet ends, and a stronger suction effect on the first air outlet channel, thereby extracting the hot air in the heat dissipation cavity more efficiently.

[0017] A further embodiment: An annular channel is provided between the motor cover and the heat insulation cover, surrounding the transmission assembly and the second fan. The air inlet of the annular channel is located on the front side of the annular channel and communicates with the heat dissipation cavity. The air outlet of the annular channel is located on the rear side of the annular channel and communicates with the air inlet of the first air outlet channel.

[0018] Based on the above technical solution: An annular channel surrounds the second fan, with its air inlet located at the front and connected to the heat dissipation cavity, and its air outlet located at the rear and connected to the air inlet of the first air outlet channel. The air outlet of the annular channel avoids the first fan, thus preventing airflow from entering the first air outlet channel during operation. Furthermore, extending the air inlet of the first air outlet channel to the front of the heat dissipation cavity allows the negative pressure suction effect of the second air outlet channel to cover the front area of ​​the heat dissipation cavity. Hot air entering the first air outlet channel through the annular channel is then drawn out, preventing heat accumulation at the front of the heat dissipation cavity and achieving effective heat dissipation for the electrical components located at the front of the heat dissipation cavity.

[0019] A further embodiment: The air fryer assembly includes a heat insulation cover and a motor cover. The heat insulation cover is located on the upper or rear side of the cooking cavity, and the motor cover is located on the side of the heat insulation cover away from the cooking cavity. A receiving cavity is provided between the heat insulation cover and the motor cover. The first fan is located in the receiving cavity, and the heat insulation cover is provided with a plurality of first ventilation holes for the airflow blown by the first fan to enter the cooking cavity and a plurality of second ventilation holes for the airflow in the cooking cavity to flow back to the first fan. The motor cover is equipped with a motor, which is used to drive the first fan to operate; A third air outlet channel is provided between the motor cover and the heat insulation cover, which connects the air outlet end of the first fan and the air inlet end of the second air outlet channel. The heat dissipation cavity is located on the upper side of the motor cover, and a third pipe connects the first pipe to the heat dissipation cavity.

[0020] Based on the above technical solution: The first fan is located in the cavity between the heat insulation cover and the motor cover, and its air outlet is connected to both the first ventilation hole of the heat insulation cover and the third air outlet channel of the motor cover. When the first fan is running, part of the airflow is blown into the cooking cavity through the first ventilation hole to heat the food, while another part of the airflow enters the second air outlet channel through the third air outlet channel, serving as the active airflow driving the Venturi effect. This active airflow flows through the air outlet of the second air outlet channel and is blown out at high speed, forming a low-pressure area at the air outlet of the first air outlet channel, thereby creating a negative pressure difference between the heat dissipation cavity on the upper side of the motor cover and the air outlet of the first air outlet channel. Under this negative pressure, the hot air in the heat dissipation cavity is drawn into the first air outlet channel through the third pipe, and then merges with the active airflow of the second air outlet channel at the air outlet before being discharged to the outside. One fan simultaneously realizes three functions: hot air heating, Venturi effect suction, and heat dissipation cavity exhaust, eliminating the need for additional fans. The structure is highly integrated, effectively reducing the number of parts and the overall size of the machine.

[0021] Further options: the second pipe is integrally formed with the motor cover, or the second pipe is separately connected to the motor cover; and / or, The first pipe and the second pipe are integrally formed, or the first pipe is separately inserted into the second pipe.

[0022] Based on the above technical solution: the integrated design ensures the positioning accuracy and concentricity between the two pipes; the plug-in method facilitates individual replacement and manufacturing.

[0023] A further embodiment: The machine body is provided with two cooking chambers and two sets of air frying components arranged side by side; the two sets of air frying components correspond one-to-one with the two cooking chambers; The two cooking cavities are arranged side by side, one above the other; and the two sets of air fryer components are arranged side by side, one above the other. Alternatively, the two cooking cavities are arranged side by side, and the two sets of air fryer components are arranged side by side; At least one set of the air fryer components has its air outlet end connected to the air inlet end of the second air outlet channel; both the first pipe and the second pipe are located between the two sets of the air fryer components.

[0024] Based on the above technical solution: when the air outlets of both air blast components are connected to the air inlet of the second air outlet channel, the airflow velocity within the second air outlet channel can be further increased. According to the Venturi effect, the faster the velocity, the lower the static pressure, and the greater the negative pressure value formed at the air outlet, thus strengthening the suction effect on the first air outlet channel and more efficiently extracting hot air from the heat dissipation cavity. Furthermore, the sharing of a single second air outlet channel between the two air blast components saves on the number of fans and air outlet channels, resulting in higher integration and lower cost.

[0025] The beneficial effects of this invention are as follows: This invention employs a second air outlet channel that surrounds the first air outlet channel, with the cross-sectional area of ​​the second air outlet channel contracting from its inlet end to its outlet end. When the airflow generated by the air blasting component is discharged through the second air outlet channel, the airflow velocity increases and the static pressure decreases in the contracted section, creating a low-pressure region at the outlet end based on the Venturi effect. Since the outlet end of the first air outlet channel is located within this low-pressure region, a negative pressure difference is formed between the outlet end of the first air outlet channel and the heat dissipation cavity. Under the action of negative pressure, the hot air in the heat dissipation cavity is actively drawn in and discharged through the first air outlet channel, accelerating the airflow within the heat dissipation cavity. Furthermore, the higher-temperature air discharged from the air blasting component through the second air outlet channel and the lower-temperature air discharged from the heat dissipation cavity through the first air outlet channel are further mixed at the outlet end. The temperature of the mixed air is lower than the temperature of the hot air directly discharged from the air blasting component, which helps to reduce the temperature rise near the wall.

[0026] Unlike existing technologies where hot air in the heat dissipation cavity is mainly blown out by a first fan, this invention uses negative pressure active suction to expel hot air from the heat dissipation cavity in a shorter time, reducing the residence time of hot air in the cavity. This suction effect is continuous, constantly replacing the hot air in the heat dissipation cavity with cool outside air, lowering the ambient temperature around the electrical components inside the cavity, delaying the aging of components caused by long-term high-temperature operation, and improving the stability of the entire machine under long-term continuous operation.

[0027] Furthermore, the suction effect of this invention utilizes the airflow generated by the air blast component itself during operation, eliminating the need for additional independent ventilation equipment or additional driving power, thus improving heat dissipation efficiency without increasing overall power consumption. This passive suction method based on the Venturi effect also avoids the noise caused by additional fan operation, achieving a balance between heat dissipation efficiency, energy consumption, and noise. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a cross-sectional structural diagram of the present invention, showing the second pipe being snapped into the motor cover and the first pipe and the second pipe being integrally formed.

[0030] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0031] Figure 3 yes Figure 1A schematic diagram of the exploded structure of the first and second pipes and the main body.

[0032] Figure 4 This is a first-view structural diagram showing the second pipe integrated with the first pipe.

[0033] Figure 5 This is a structural schematic diagram from a second perspective showing that the second pipe is integrated with the first pipe.

[0034] Figure 6 This is a cross-sectional structural diagram from a first-view perspective showing that the shaft of the second fan is perpendicular to the shaft of the first fan.

[0035] Figure 7 yes Figure 6 A magnified structural diagram at point B.

[0036] Figure 8 yes Figure 6 A magnified schematic diagram of the air outlet structure of the first and second air outlet channels at point C.

[0037] Figure 9 This is a cross-sectional view of the second fan's shaft being perpendicular to the first fan's shaft.

[0038] Figure 10 This is a schematic diagram of the exploded structure of the first meshing part, the second meshing part, and the first pipe.

[0039] Figure 11 yes Figure 10 A magnified structural diagram at point D.

[0040] Figure 12 This is a schematic diagram of the air outlet ends of the first and second air outlet channels.

[0041] Figure 13 This is a cross-sectional structural diagram of the first fan located between the motor cover and the heat shield.

[0042] Figure 14 yes Figure 13 A magnified schematic diagram of the air outlet structure of the first and second air outlet channels at point E.

[0043] Figure 15 This is a schematic diagram of the structure where the second pipe is inserted into the first pipe.

[0044] Figure 16 This is a schematic diagram of the exploded structure of the second pipe and the first pipe.

[0045] Explanation of the labels in the diagram: 1-Main body; 11-Cooking cavity; 12-Heat dissipation cavity; 2-First pipe; 21-First air outlet channel; 3-Second pipe; 31-Second air outlet channel; 41-First fan; 42-Heat insulation cover; 421-Hot air cavity; 422-First ventilation hole; 423-Second ventilation hole; 424-Hot air outlet; 43-Motor cover; 431-Cold air cavity; 432-Motor; 433-Second fan; 434-Second fan mounting part; 435-Cold air outlet; 441-First meshing part; 442-Second meshing part; 45-Receiving cavity; 46-Third air outlet channel; 47-Third pipe; 5-Annular channel; 6-Intermediate connecting channel; 7-Supporting rib; 8-Air inlet; 9-Heating element. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0047] like Figures 1 to 16 As shown, this embodiment provides an air fryer, including: The machine body 1 has a cooking cavity 11 inside and a heat dissipation cavity 12 inside; the heat dissipation cavity 12 can be located at the front, rear or upper part of the machine body; electronic components such as motor 432 and circuit board are located inside the heat dissipation cavity 12. A first pipe 2 is disposed inside the body 1. A first air outlet channel 21 is provided inside the first pipe 2. The heat dissipation cavity 12 is connected to the outside through the first air outlet channel 21. An air fryer assembly, disposed within the body 1, includes a first fan 41 for heating the cooking cavity 11 with hot air; and... The second pipe 3 surrounds the outer side of the first pipe 2, and a second air outlet channel 31 is provided between the inner sidewall of the second pipe 3 and the outer sidewall of the first pipe 2. The air outlet end of the air fryer assembly is connected to the air inlet end of the second air outlet channel 31. The air fryer assembly is connected to the outside through the second air outlet channel 31. The air outlet end of the second air outlet channel 31 surrounds the outer side of the air outlet end of the first air outlet channel 21. The cross-sectional area of ​​the second air outlet channel 31 gradually decreases from its air inlet end to its air outlet end. That is, when the air fryer assembly is working, the first fan 41 blows hot air into the cooking chamber 11, and the excess hot air will be discharged from the second air outlet channel 31. Since the cross-sectional area of ​​the second air outlet channel 31 is set to contract from its air inlet end to its air outlet end, the airflow is accelerated at the air outlet end of the second air outlet channel 31, forming a low-pressure area at the air outlet end according to the Venturi effect. Since the air outlet of the first air outlet channel 21 is located in the low-pressure area, the hot air in the heat dissipation cavity 12 inside the body 1 is actively drawn out through the first air outlet channel 21 under the action of negative pressure, which accelerates the air flow in the heat dissipation cavity 12 and further improves the heat dissipation efficiency.

[0048] In some specific implementations, such as Figure 1 , Figure 2 and Figure 6 As shown, a second fan 433 is also provided inside the body 1 near the air inlet end of the second air outlet channel 31, and the second fan 433 blows air towards the air outlet end of the second air outlet channel 31. When the second fan 433 is running, it continuously blows air into the second air outlet channel 31, and the airflow generated by the first fan 41 of the air blasting component is combined and discharged through the second air outlet channel 31, thereby increasing the exhaust pressure. The airflow is further accelerated at the air outlet end of the second air outlet channel 31, and the Venturi effect is more significant at the air outlet end, which is conducive to the airflow in the heat dissipation cavity 12 being drawn into the first air outlet channel 21 and discharged outward.

[0049] In some specific implementations, such as Figure 1 , Figure 6 and Figure 13 As shown, the air outlets of the first air outlet duct 21 and the second air outlet duct 31 are both located on the rear side of the unit body 1. They can be configured to exhaust air directly to the rear, to the side rear, or to the upper rear at an angle. The two air outlets are concentrated on the rear side of the unit body 1, and the exhaust airflow is directed in the same direction toward the rear of the unit body 1, avoiding diffusion toward the user.

[0050] In some specific implementations, such as Figure 1 , Figure 6 and Figure 13As shown, the air fryer assembly includes a heat insulation cover 42 and a motor cover 43. When the heat insulation cover 42 is located above the cooking cavity 11, the motor cover 43 is located above the heat insulation cover 42; alternatively, when the heat insulation cover 42 is located behind the cooking cavity 11, the motor cover 43 is located behind the heat insulation cover 42. The heating element 9 of the air fryer assembly can be located above the cooking cavity 11 or behind the cooking cavity 11.

[0051] The heat insulation cover 42 contains a hot air chamber 421 communicating with the cooking cavity 11, and the first fan 41 is located inside the hot air chamber 421. A cold air chamber 431 is provided between the motor cover 43 and the heat insulation cover 42, and the second fan 433 is located inside the cold air chamber 431. A motor 432 is mounted on the motor cover 43, which drives the first fan 41 and the second fan 433. Both the hot air chamber 421 and the cold air chamber 431 exhaust air outwards through the second air outlet channel 31. The hot air from the hot air chamber 421 and the cooling air from the cold air chamber 431 share the same second air outlet channel 31. The two airflows converge and are discharged together within the second air outlet channel 31, creating a more pronounced Venturi effect at the outlet ends of the second air outlet channel 31 and the first air outlet channel 21. This further draws the airflow within the heat dissipation cavity 12 into the first air outlet channel 21 for rapid discharge, resulting in a more significant heat dissipation effect.

[0052] In some specific implementations, such as Figures 6 to 11 As shown, in order to ensure that the airflow from the second fan 433 is directed directly towards the second air outlet 31, thereby increasing the exhaust velocity, the shafts of the first fan 41 and the second fan 433 are perpendicular to each other. The first fan 41 is coaxially mounted on the output shaft of the motor. A transmission assembly is provided between the motor 432 and the second fan 433, and the motor 432 drives the second fan 433 to operate through the transmission assembly. Specifically, a second fan mounting part 434 is provided on the upper side of the heat insulation cover 42, and the second fan 433 is rotatably mounted on the second fan mounting part 434. The transmission assembly includes a first engagement part 441 disposed on the output shaft of the motor 432 and a second engagement part 442 coaxial with the shaft of the second fan 433. The first engagement part 441 and the second engagement part 442 are driven by helical gear meshing. When the motor 432 rotates, power is transmitted to the second fan 433 through helical gear meshing, realizing synchronous linkage between the first fan 41 and the second fan 433. Both the first meshing part 441 and the second meshing part 442 are bevel gears.

[0053] Or, in another implementation, such as Figure 1As shown, the first fan 41 and the second fan 433 are coaxially mounted on the output shaft of the motor 432. This layout results in a more compact structure with fewer components. When the second fan 433 is operating, it directly cools the motor 432 above it.

[0054] In some specific implementations, such as Figure 6 , Figure 9 and Figure 10 As shown, an annular channel 5 is provided between the motor cover 43 and the heat insulation cover 42, surrounding the transmission assembly and the second fan 433. The air inlet of the annular channel 5 is located on the front side and communicates with the heat dissipation cavity 12, while the air outlet of the annular channel 5 is located on the rear side and communicates with the air inlet of the first air outlet channel 21. The annular channel 5 bypasses the second fan 433, which can prevent the airflow generated by the second fan 433 from directly entering the first air outlet channel 21 during operation; furthermore, the annular channel 5 extends the air inlet of the first air outlet channel 21 to the front side of the heat dissipation cavity 12, so that the negative pressure suction can cover the front area of ​​the heat dissipation cavity 12.

[0055] In some specific implementations, such as Figures 1 to 5 As shown, the machine body 1 has two cooking chambers 11 arranged side by side and two sets of air frying components; the two sets of air frying components correspond one-to-one with the two cooking chambers 11. The two cooking chambers 11 are arranged side by side, one above the other, and the two sets of air fryer components are arranged side by side, one above the other. Alternatively, the two cooking cavities 11 can be arranged side by side, and the two sets of air fryer components can be arranged side by side. At least one air fryer assembly has its air outlet end connected to the air inlet end of the second air outlet channel 31. Preferably, the air outlet ends of both air fryer assemblies are connected to the air inlet end of the second air outlet channel 31, thereby further increasing the exhaust velocity of the second air outlet channel 31 and forming a stronger Venturi effect at the air outlet end. This allows the airflow in the heat dissipation cavity 12 to be further accelerated and drawn into the first air outlet channel 21, thereby increasing the heat dissipation efficiency. The first pipe 2 and the second pipe 3 are both located between the two sets of air fryer components, thereby facilitating the first air outlet channel 21 to draw heat from the heat dissipation cavity 12 between the two cooking cavities and the two motors 432.

[0056] In some specific implementations, such as Figures 13 to 16As shown, the air fryer assembly includes a heat insulation cover 42 and a motor cover 43, with the motor cover 43 located above the heat insulation cover 42. A receiving cavity 45 is provided between the heat insulation cover 42 and the motor cover 43, and the first fan 41 is located within the receiving cavity 45. The heat insulation cover 42 has several first ventilation holes 422 for the airflow from the first fan 41 to enter the cooking chamber 11, and several second ventilation holes 423 for the airflow from the cooking chamber 11 to the first fan 41. The motor cover 43 has a motor 432 for driving the first fan 41. A third air outlet channel 46 is provided between the motor cover 43 and the heat insulation cover 42, connecting the air outlet of the first fan 41 and the air inlet of the second air outlet channel 31. The heat dissipation cavity 12 is located above the motor cover 43, and a third pipe 47 connects the first pipe 2 to the heat dissipation cavity 12. The air outlet of the first fan 41 is connected to the first ventilation hole 422 of the heat insulation cover 42 and the third air outlet channel 46 of the motor cover 43. Part of the airflow is blown into the cooking cavity 11 through the first ventilation hole 422, and the other part of the airflow enters the second air outlet channel 31 through the third air outlet channel 46.

[0057] In some specific implementations, such as Figure 1 As shown, the second pipe 3 is connected to the motor cover 43 in a split manner, and can be configured as a snap-fit ​​for easy disassembly and maintenance.

[0058] Alternatively, the second pipe 3 can be integrally formed with the motor cover 43 to increase structural strength.

[0059] In some specific implementations, such as Figure 4 As shown, the first pipe 2 and the second pipe 3 are integrally formed, reducing the number of parts and assembly steps.

[0060] Or, such as Figure 14 As shown, the first pipe 2 is inserted separately into the second pipe 3, which facilitates separate manufacturing. When the first pipe 2 is inserted into the second pipe 3, a supporting rib 7 can be provided between the outer side wall of the first pipe 2 and the inner side wall of the second pipe 3 to strengthen the structure.

[0061] like Figures 1 to 5As shown, in one specific embodiment of this invention, the air fryer assembly is located at the rear of the cooking chamber 11, and can be configured as a single-layer or double-layer cooking chamber 11. When it is a double-layer cooking chamber 11, the heat dissipation chamber 12 is located at the rear of the body 1. The first air outlet channel 21 is located between the upper and lower air fryer assemblies to facilitate the extraction of air from the heat dissipation chamber 12 between them. The motor cover 43 is provided with a cold air outlet 435 for exhausting air from the cold air chamber 431, and the heat insulation cover 42 is provided with a hot air outlet 424 for exhausting air from the hot air chamber 421. Both the cold air outlet 435 and the hot air outlet 424 are connected to the second air outlet channel 31 for exhausting air. Specifically, the second pipe 3 is provided with an upwardly bent intermediate connecting channel 6. The air inlet end of the intermediate connecting channel 6 is connected to both the hot air outlet 424 and the cold air outlet 435, and its upper end is snapped onto the motor cover 43. The second pipe 3 can also be designed with a downwardly bent intermediate connecting channel 6 to connect with the air blasting component located on the lower side. The intermediate connecting channel 6 is integrally set with the second pipe 3, which facilitates manufacturing and increases airtightness. The first pipe 2 is located inside the second pipe 3 and is integrally formed with it. Specifically, the first pipe 2 extends backward from the rear side wall of the second pipe 3 and is integrally formed with the rear side wall of the second pipe 3, which facilitates direct connection between the air inlet end of the first air outlet channel 21 and the heat dissipation chamber 12. In this embodiment, the first fan 41 and the second fan 433 are coaxially arranged and both exhaust air towards the second air outlet duct 31, thereby increasing the exhaust pressure and creating a stronger Venturi effect at the air outlet ends of the first air outlet duct 21 and the second air outlet duct 31, accelerating the airflow in the heat dissipation cavity 12 to be drawn into the first air outlet duct 21. An air inlet 8 is provided on the body 1 for intake of air from the outside when the first fan 41 and the second fan 433 are operating.

[0062] like Figures 6 to 12 As shown, in another specific embodiment, the second pipe 3 is integrally formed with the motor cover 43. The first pipe 2 is located between the motor cover 43 and the heat insulation cover 42, and the air outlet end of the first pipe 2 is inserted into the second pipe 3. The first air outlet channel 21 is connected to the heat dissipation cavity 12 at the front of the body 1 through the annular channel 5. The shaft of the second fan 433 is perpendicular to the shaft of the first fan 41. The second fan 433 is located at the air inlet end of the second air outlet channel 31, and when it is working, it blows air towards the air outlet end of the second air outlet channel 31, thereby increasing the exhaust air velocity and forming a stronger Venturi effect at the air outlet ends of the first air outlet channel 21 and the second air outlet channel 31, accelerating the airflow in the heat dissipation cavity 12 to be drawn into the first air outlet channel 21. The hot air outlet 424 on the heat insulation cover 42 directly exhausts air towards the air outlet end of the second air outlet channel 31. The body 1 is provided with an air inlet 8 for the first fan 41 and the second fan 433 to draw air from the outside when they are working.

[0063] like Figures 13 to 16As shown, in the third specific embodiment, a first fan 41 is arranged between the heat insulation cover 42 and the motor cover 43, and a first pipe 2 is inserted into a second pipe 3. While blowing airflow into the cooking cavity 11, the first fan 41 also exhausts air outward through the second air outlet channel 31. A third air outlet channel 46 is provided between the motor cover 43 and the heat insulation cover 42, connecting the air outlet end of the first fan 41 and the air inlet end of the second air outlet channel 31. The heat dissipation cavity 12 is located on the upper side of the motor cover 43, and a third pipe 47 connects the first pipe 2 and the heat dissipation cavity 12. The third pipe 47 is integrally formed with the first pipe 2, and the third pipe 47 bends upward from the front end of the first pipe 2 to connect with the heat dissipation cavity 12 in the upper part of the body 1. A supporting rib 7 is also provided on the inner wall of the air outlet of the second pipe 3 to support the first pipe 2. An air inlet 8 is provided on the body 1 for air to enter from the outside when the first fan 41 is working.

[0064] Working principle explanation: When the air fryer is working, the motor 432 drives the first fan 41 and the second fan 433 to operate.

[0065] In the scheme employing a separate layout of hot air chamber 421 and cold air chamber 431, the first fan 41 blows the hot air heated by the heating element 9 from the hot air chamber 421 into the cooking chamber 11 to heat and cook the food. The second fan 433 draws in cooling air from the outside and sends it into the cold air chamber 431 to cool the motor 432 and the upper side of the heat insulation cover 42. After cooling, the airflow enters the second air outlet channel 31 together with some of the hot air discharged from the hot air chamber 421. The two airflows merge and flow towards the outlet end along the second air outlet channel 31. Since the cross-sectional area of ​​the second air outlet channel 31 is designed to contract from its inlet end to its outlet end, the combined airflow increases in velocity as it flows through the contraction section, forming a low-pressure area at the outlet end according to the Venturi effect. The outlet end of the first air outlet channel 21 is located inside the outlet end of the second air outlet channel 31, thus creating a negative pressure difference between the outlet end of the first air outlet channel 21 and the heat dissipation chamber 12, thereby generating an active suction effect on the first air outlet channel 21. Hot air in the heat dissipation cavity 12 enters the first air outlet 21 through the annular channel 5, is accelerated and extracted, and is discharged to the outside along with the mixed airflow in the second air outlet 31. Because the total air volume increases after the hot air and cooling air merge, the negative pressure value formed in the contraction section is greater, the suction effect is stronger, and the hot air in the heat dissipation cavity 12 can be extracted more efficiently, reducing the ambient temperature around the electrical components in the heat dissipation cavity 12.

[0066] In the configuration employing the cavity 45 layout, the first fan 41 is located within the cavity 45 between the heat insulation cover 42 and the motor cover 43. Its outlet is connected to both the first ventilation hole 422 of the heat insulation cover 42 and the third air outlet channel 46 of the motor cover 43. When the first fan 41 operates, a portion of the airflow is blown into the cooking cavity 11 through the first ventilation hole 422 to heat the food, while another portion enters the second air outlet channel 31 through the third air outlet channel 46, serving as the active airflow driving the Venturi effect. The negative pressure at the outlet of the second air outlet channel 31 is transmitted to the heat dissipation cavity 12 via the third pipe 47 and the first air outlet channel 21, drawing hot air out of the heat dissipation cavity 12 on the upper side of the motor cover 43. Thus, a single fan simultaneously performs three functions: hot air heating, Venturi effect suction, and exhaust from the heat dissipation cavity 12.

[0067] This invention is not limited to the above-mentioned optional embodiments. Under the premise of non-contradiction, the various solutions can be combined arbitrarily. Anyone can derive other forms of products under the guidance of this invention. However, no matter what changes are made in their shape or structure, all technical solutions that fall within the scope of the claims of this invention are within the protection scope of this invention.

Claims

1. An air fryer, characterized in that, include: The machine body has a cooking cavity and a heat dissipation cavity. A first pipe is installed inside the machine body, and a first air outlet channel is provided inside the first pipe. The heat dissipation cavity is connected to the outside through the first air outlet channel. An air fryer assembly, disposed within the machine body, the air fryer assembly including a first fan for heating the cooking cavity with hot air; and... The second pipe is arranged around the outside of the first pipe, and a second air outlet channel is provided between the inner side wall of the second pipe and the outer side wall of the first pipe. The air outlet end of the air blasting component is connected to the air inlet end of the second air outlet channel. The air outlet end of the second air outlet channel is arranged around the outside of the air outlet end of the first air outlet channel. The cross-sectional area of ​​the second air outlet channel gradually decreases from its air inlet end to its air outlet end.

2. The air fryer cooking machine according to claim 1, characterized in that, The machine body is also equipped with a second fan at the air inlet end near the second air outlet channel, and the second fan blows air towards the air outlet end of the second air outlet channel.

3. An air fryer cooking machine according to claim 2, characterized in that, The air outlets of the first and second air outlet channels are both located at the rear of the machine body.

4. An air fryer cooking machine according to claim 3, characterized in that, The air fryer assembly includes a heat insulation cover and a motor cover. The heat insulation cover has a hot air chamber that communicates with the cooking cavity, and the first fan is located inside the hot air chamber. The heat insulation cover is located on the upper or rear side of the cooking cavity, and the motor cover is located on the side of the heat insulation cover away from the cooking cavity. A cold air chamber is provided between the motor cover and the heat insulation cover, and the second fan is disposed in the cold air chamber; The motor cover is equipped with a motor, which is used to drive the first fan and the second fan to operate. Both the hot air chamber and the cold air chamber exhaust air outward through the second air outlet channel.

5. An air fryer cooking machine according to claim 4, characterized in that, The shafts of the first fan and the second fan are perpendicular to each other; the first fan is coaxially mounted on the output shaft of the motor; a transmission assembly is provided between the motor and the second fan, and the motor drives the second fan to operate through the transmission assembly; Alternatively, the first fan and the second fan are coaxially mounted on the output shaft of the motor.

6. An air fryer cooking machine according to claim 5, characterized in that, When the shafts of the first fan and the second fan are perpendicular to each other, a second fan mounting part is provided on the upper side of the heat insulation cover, and the second fan is rotatably mounted on the second fan mounting part; The transmission assembly includes a first engagement part disposed on the output shaft of the motor and a second engagement part coaxial with the shaft of the second fan. The first engagement part and the second engagement part are driven by helical gear meshing.

7. An air fryer cooking machine according to claim 6, characterized in that, An annular channel is provided between the motor cover and the heat insulation cover, surrounding the transmission assembly and the second fan. The air inlet of the annular channel is located on the front side of the annular channel and communicates with the heat dissipation cavity. The air outlet of the annular channel is located on the rear side of the annular channel and communicates with the air inlet of the first air outlet channel.

8. An air fryer cooking machine according to claim 1, characterized in that, The air fryer assembly includes a heat insulation cover and a motor cover. The heat insulation cover is located on the upper or rear side of the cooking cavity, and the motor cover is located on the side of the heat insulation cover away from the cooking cavity. A receiving cavity is provided between the heat insulation cover and the motor cover. The first fan is located in the receiving cavity. The heat insulation cover is provided with a plurality of first ventilation holes for the airflow blown by the first fan to enter the cooking cavity and a plurality of second ventilation holes for the airflow in the cooking cavity to flow back to the first fan. The motor cover is equipped with a motor, which is used to drive the first fan to operate; A third air outlet channel is provided between the motor cover and the heat insulation cover, which connects the air outlet end of the first fan and the air inlet end of the second air outlet channel. The heat dissipation cavity is located on the upper side of the motor cover, and a third pipe connects the first pipe to the heat dissipation cavity.

9. An air fryer cooking machine according to any one of claims 4 to 8, characterized in that, The second pipe is integrally formed with the motor cover or is separately connected to the motor cover; and / or, The first pipe and the second pipe are integrally formed, or the first pipe is separately inserted into the second pipe.

10. An air fryer cooking machine according to claim 1, characterized in that, The machine body is provided with two cooking chambers and two sets of air frying components arranged side by side; the two sets of air frying components correspond one-to-one with the two cooking chambers; The two cooking cavities are arranged side by side, one above the other; and the two sets of air fryer components are arranged side by side, one above the other. Alternatively, the two cooking cavities are arranged side by side, and the two sets of air fryer components are arranged side by side; At least one set of the air fryer components has its air outlet end connected to the air inlet end of the second air outlet channel; both the first pipe and the second pipe are located between the two sets of the air fryer components.

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