An air supply mechanism and an air fryer oven

Abstract

The present invention discloses an air supply mechanism, which includes a rotating shaft, an air supply fan blade, and a heat dissipation fan blade. The heat dissipation fan blade is fixedly connected to the rotating shaft, and the air supply fan blade is installed on the rotating shaft through an overrunning mechanism. The overrunning mechanism can drive the air supply fan blade to rotate together with the rotating shaft when the rotating shaft rotates in the first rotation direction. Moreover, the overrunning mechanism can disconnect the air supply fan blade from the rotational drive of the rotating shaft when the rotating shaft rotates in the second rotation direction. The air supply mechanism provided by this solution utilizes the one-way drive and reverse stopping characteristics of the overrunning mechanism. Whether in the case of the air fryer oven performing pure baking work or in the case of air frying work, the heat dissipation fan blade can effectively dissipate heat from driving components such as the motor, improving the product reliability, extending the service life, and reducing the product manufacturing cost and maintenance difficulty. The present invention also discloses an air fryer oven including the above-mentioned air supply mechanism.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 202011052525.1 and the invention title "An air supply mechanism and an air fryer oven", which was filed with the Chinese Patent Office on September 29, 2020. The entire content of which is incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of baking appliances, and in particular, to an air supply mechanism and an air fryer oven. Background Art

[0003] Air frying is a way of baking food. Since it uses little or no cooking oil when processing food, it can reduce the oil content in the food and has the advantages of being healthy, easy to use, and easy to clean. Therefore, it is becoming more and more popular among people. The principle of air frying is to use hot air heated by electric energy to flow cyclically in a closed container, so as to quickly fry the food in the container and make the food have a taste and flavor similar to that of fried food.

[0004] Currently, the structure of an air fryer oven mainly includes an air supply mechanism, a heating element, and a container for holding food. The heating element is used to heat the air in the container, and the air supply mechanism is used to direct the flow of the heated hot air to heat and fry the food placed in the container. The air supply mechanism includes a motor, a blower fan blade, and a heat dissipation fan blade fixedly connected to the rotating shaft of the motor. When the rotating shaft of the motor rotates, it drives the blower fan blade and the heat dissipation fan blade to rotate simultaneously.

[0005] When the existing air fryer oven performs pure baking work, the blower fan blade does not need to rotate, otherwise it will damage the normal baking of the food ingredients. When the blower fan blade is stationary, the heat dissipation fan blade cannot rotate either, and the high-temperature container directly bakes the motor, resulting in the motor temperature being too high to be used normally. For this reason, an additional heat dissipation mechanism needs to be provided to dissipate heat from the motor, which makes the structure of the air fryer oven more complex, and at the same time greatly increases the product manufacturing cost and the maintenance difficulty.

[0006] Therefore, how to solve the problem of motor heat dissipation in the air fryer oven during pure baking is a technical problem that needs to be solved by those skilled in the art at present. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide an air supply mechanism that can effectively dissipate heat from the motor during both the pure baking work and the air frying work of the air fryer oven, improve the product reliability, extend the service life, and reduce the product manufacturing cost and the maintenance difficulty. Another purpose of the present invention is to provide an air fryer oven including the above air supply mechanism.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] An air supply mechanism, comprising a rotating shaft, an air supply fan blade and a heat dissipation fan blade, wherein the heat dissipation fan blade is fixedly connected to the rotating shaft, the air supply fan blade is mounted on the rotating shaft through an overrunning mechanism, the overrunning mechanism can drive the air supply fan blade to rotate together with the rotating shaft when the rotating shaft rotates in a first rotation direction, and the overrunning mechanism can disengage the air supply fan blade from the rotational drive of the rotating shaft when the rotating shaft rotates in a second rotation direction.

[0010] Preferably, the overrunning mechanism includes a first moving part, a second moving part and a stop component arranged between the first moving part and the second moving part. The rotating shaft is fixedly connected to the first moving part, the air supply fan blade is fixedly connected to the second moving part, the stop component can drive the second moving part to rotate together with the first moving part when the first moving part rotates in a first rotation direction, and the stop component can disengage the second moving part from the rotational drive of the first moving part when the first moving part rotates in a second rotation direction.

[0011] Preferably, the overrunning mechanism is a ratchet mechanism, a ball locking one-way mechanism or a free-travel one-way clutch.

[0012] Preferably, the overrunning mechanism is a ball locking one-way mechanism. The ball locking one-way mechanism includes an inner ring and an outer ring rotatably connected coaxially with the outer ring of the inner ring. A plurality of balls are arranged between the inner ring and the outer ring. The outer ring of the inner ring is provided with a plurality of ball grooves extending circumferentially and distributed at intervals. The ball grooves and the inner wall of the outer ring form a cavity for accommodating the balls. The tail end to the head end of each cavity extends along the same rotation direction around the inner ring, and the width of each cavity in the radial direction of the inner ring gradually decreases from the tail end to the head end. The width of the tail end of the cavity in the radial direction of the inner ring is greater than the diameter of the ball, and the width of the head end of the cavity in the radial direction of the inner ring is less than or equal to the diameter of the ball.

[0013] Preferably, the side wall of the ball groove for contacting the ball and the inner wall of the outer ring for contacting the ball are provided with limiting grooves for restricting the axial movement of the ball along the rotating shaft.

[0014] Preferably, the ball locking one-way mechanism further includes a first support plate and a second support plate. The first support plate is fixedly connected to the rotating shaft. The second support plate is fixedly connected to the air supply fan blade and is arranged to rotate relative to the rotating shaft. The first support plate is provided with a first support portion for supporting the ball. The second support plate is provided with a second support portion for applying pressure to the ball. The first support plate supports the second support plate through the ball. The first support plate is fixedly connected to one of the inner ring and the outer ring, and the second support plate is fixedly connected to the other of the inner ring and the outer ring;

[0015] Alternatively, the ball locking one-way mechanism further includes a first support plate, a second support plate and a limiting ring. The first support plate is fixedly connected to the air supply fan blade and is arranged to rotate relative to the rotating shaft. The second support plate is fixedly connected to the rotating shaft. The first support plate is provided with a first support portion for supporting the ball. The limiting ring is fixedly connected to the rotating shaft and is used for supporting the first support plate. The first support plate is fixedly connected to one of the inner ring and the outer ring, and the second support plate is fixedly connected to the other of the inner ring and the outer ring.

[0016] Preferably, the heat dissipation fan blade is a radial centrifugal fan blade.

[0017] Preferably, the air supply mechanism further includes a motor, and the rotating shaft is the main shaft of the motor.

[0018] Preferably, the air supply mechanism further includes a heat dissipation air hood. The heat dissipation air hood covers the outer periphery of the heat dissipation fan blade. The rotating shaft penetrates through the heat dissipation air hood and forms a heat dissipation air inlet between the rotating shaft and the heat dissipation air hood. The outer periphery of the heat dissipation air hood is provided with a heat dissipation air outlet.

[0019] The air supply mechanism provided by the present invention includes a rotating shaft, an air supply fan blade and a heat dissipation fan blade. The heat dissipation fan blade is fixedly connected to the rotating shaft. The air supply fan blade is installed on the rotating shaft through an overrunning mechanism. The overrunning mechanism can drive the air supply fan blade to rotate together with the rotating shaft when the rotating shaft rotates in the first rotation direction. Moreover, the overrunning mechanism can disengage the air supply fan blade from the rotational drive of the rotating shaft when the rotating shaft rotates in the second rotation direction.

[0020] The working principle of the solution of the present invention is as follows:

[0021] When the air supply mechanism is applied to an air fryer oven, when the rotating shaft rotates in the first rotation direction, it can drive the air supply fan blade and the heat dissipation fan blade to rotate together. Among them, the air supply fan blade can provide an air flow for blowing hot air for the air fryer oven, which is suitable for the air fryer oven to perform baking and blowing operations. At the same time, the heat dissipation fan blade can dissipate heat and cool the driving components such as the motor of the air supply mechanism; when the rotating shaft rotates in the second rotation direction, it can drive the heat dissipation fan blade to rotate and dissipate heat from the driving components such as the motor. Due to the one-way driving characteristic of the overrunning mechanism, the air supply fan blade is disengaged from the rotational drive of the rotating shaft. Therefore, the air supply fan blade cannot rotate with the rotating shaft. At this time, the air supply mechanism is suitable for the air fryer oven to perform simple baking operations without the air supply fan blade providing an air flow for blowing hot air.

[0022] It can be seen that the air supply mechanism provided by this solution utilizes the one-way driving and reverse stopping characteristics of the overrunning mechanism. Whether in the case of simple baking of the air fryer oven or in the case of air frying, it can effectively dissipate heat from the driving components such as the motor using the heat dissipation fan blade, improving product reliability, extending service life, and reducing product manufacturing costs and maintenance difficulties.

[0023] The present invention also provides an air fryer oven including the above air supply mechanism. The derivation process of the beneficial effects generated by this air fryer oven is generally similar to the derivation process of the beneficial effects brought by the above air supply mechanism, so it will not be elaborated herein. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the internal structure when the air supply mechanism in a specific embodiment of the present invention is installed in an air fryer oven;

[0026] Figure 2 It is a schematic diagram of the structure of the air supply mechanism in a specific embodiment of the present invention;

[0027] Figure 3 It is a top view of the ball locking one-way mechanism in a specific embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the installation structure of the first ball locking one-way mechanism in a specific embodiment of the present invention;

[0029] Figure 5Schematic diagram of the installation structure of the second ball locking one-way mechanism in the specific embodiment of the present invention;

[0030] Figure 6 Schematic diagram of the installation structure of the second ball locking one-way mechanism in the specific embodiment of the present invention;

[0031] Figure 7 Schematic diagram of the structure of the free travel one-way clutch in the specific embodiment of the present invention;

[0032] Figure 8 Schematic diagram of the structure of the first ratchet mechanism in the specific embodiment of the present invention;

[0033] Figure 9 Schematic diagram of the structure of the second ratchet mechanism in the specific embodiment of the present invention.

[0034] Figures 1 to 9 The meanings of the following reference numerals are as follows:

[0035] 1 - air supply air duct, 2 - air supply fan blade, 3 - heat dissipation air duct, 4 - heat dissipation fan blade, 5 - heat dissipation air inlet, 6 - motor, 7 - heat dissipation air outlet, 8 - container, 9 - overrunning mechanism, 10 - rotating shaft, 11 - outer ring, 12 - inner ring, 13 - ball, 14 - cavity, 15 - tail end, 16 - head end, 17 - limiting groove, 18 - first support plate, 19 - second support plate, 20 - limiting ring, 21 - ratchet teeth, 22 - ratchet wheel, 23 - inner ratchet teeth, 24 - spring, 25 - ratchet pawl. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] Please refer to Figures 1 to 9 , the present invention provides an air supply mechanism, including a rotating shaft 10, an air supply fan blade 2 and a heat dissipation fan blade 4. The heat dissipation fan blade 4 is fixedly connected to the rotating shaft 10, and the air supply fan blade 2 is installed on the rotating shaft 10 through an overrunning mechanism 9. The overrunning mechanism 9 can drive the air supply fan blade 2 to rotate together with the rotating shaft 10 when the rotating shaft 10 rotates in the first rotation direction. Moreover, the overrunning mechanism 9 can disengage the air supply fan blade 2 from the rotational drive of the rotating shaft 10 when the rotating shaft 10 rotates in the second rotation direction.

[0038] The working principle of the solution of the present invention is as follows:

[0039] When this air supply mechanism is applied to an air fryer oven, when the rotating shaft 10 rotates in the first rotation direction, due to the one-way driving characteristic of the overrunning mechanism, the rotating shaft 10 can drive the air supply fan blade 2 and the heat dissipation fan blade 4 to rotate together. Among them, the air supply fan blade 2 can provide an air flow for blowing hot air for the air fryer oven, which is suitable for the air fryer oven to perform baking and blowing operations. At the same time, the heat dissipation fan blade 4 can dissipate heat from the driving components such as the motor 6 of the air supply mechanism; when the rotating shaft 10 rotates in the second rotation direction, it can drive the heat dissipation fan blade 4 to rotate and dissipate heat from the driving components such as the motor 6, and due to the one-way driving and reverse stopping characteristics of the overrunning mechanism 9, the air supply fan blade 2 is disengaged from the rotational drive of the rotating shaft 10. Therefore, the air supply fan blade 2 cannot rotate with the rotating shaft 10. At this time, this air supply mechanism is suitable for the air fryer oven to perform simple baking operations without the air supply fan blade 2 providing an air flow for blowing hot air.

[0040] It can be seen that the air supply mechanism provided by this solution utilizes the one-way driving and reverse stopping characteristics of the overrunning mechanism 9. Whether in the case of simple baking operation of the air fryer oven or in the case of air frying operation, the heat dissipation fan blade 4 can effectively dissipate heat from the driving components such as the motor 6, improving product reliability, extending service life, and reducing product manufacturing costs and maintenance difficulties.

[0041] Preferably, the overrunning mechanism 9 includes a first moving part, a second moving part, and a stopping component arranged between the first moving part and the second moving part. The rotating shaft 10 is fixedly connected to the first moving part, the air supply fan blade 2 is fixedly connected to the second moving part, and the stopping component can make the first moving part drive the second moving part to rotate together when the first moving part rotates in the first rotation direction, and the stopping component can make the second moving part disengage from the rotational drive of the first moving part when the first moving part rotates in the second rotation direction.

[0042] Specifically, there are various forms of structures that can achieve the functions of the above stopping component. According to the different structural shapes of the first moving part and the second moving part, the overrunning mechanism 9 can specifically adopt mechanisms with one-way driving and reverse stopping characteristics such as a ratchet mechanism, a ball locking one-way mechanism, or a free travel one-way clutch.

[0043] In a preferred embodiment, the overrunning mechanism 9 is a ball locking one-way mechanism, such as Figure 3As shown, the ball locking one-way mechanism includes an inner ring 12 and an outer ring 11 rotatably connected coaxially to the outer ring of the inner ring 12. A plurality of balls 13 are provided between the inner ring 12 and the outer ring 11. The balls 13 can be spherical steel balls, alloy balls, glass balls, etc., having sufficient strength and hardness to support rotation. The outer ring of the inner ring 12 is provided with a plurality of ball grooves extending circumferentially and spaced apart. The ball grooves and the inner wall of the outer ring 11 form a cavity 14 for accommodating the balls 13. The tail end 15 to the head end 16 of each cavity 14 extends along the same rotational direction around the inner ring 12 (for example Figure 3 the extension direction from the tail end 15 to the head end 16 of each cavity 14 shown in is arranged in the clockwise direction around the inner ring 12), and the width of each cavity 14 in the radial direction of the inner ring 12 gradually decreases from the tail end 15 to the head end 16. The width of the tail end 15 of the cavity 14 in the radial direction of the inner ring 12 is greater than the diameter of the ball 13, and the width of the head end 16 of the cavity 1 in the radial direction of the inner ring 12 is less than or equal to the diameter of the ball 13. In this embodiment, the rotating shaft 10 can be fixedly connected coaxially with the inner ring 12 or with the outer ring 11. Correspondingly, the blower fan blade 2 is fixedly connected to the other one of the inner ring 12 and the outer ring 11. Preferably, for convenience of arrangement, as Figure 3 shown, the rotating shaft 10 is fixedly connected coaxially with the inner ring 12, and the blower fan blade 2 is fixedly connected to the outer ring 11. When the rotating shaft 10 rotates counterclockwise, the ball 13 rolls to the head end 16 of the cavity 14. At this time, both sides of the ball 13 are in close contact with the ball groove and the inner wall of the outer ring 11 respectively. Therefore, the rotating shaft 10 can transmit the torque to the outer ring 11, thereby driving the blower fan blade 2 to rotate counterclockwise together with the rotating shaft 10. When the rotating shaft 10 rotates clockwise, the ball 13 rolls to the tail end 15 of the cavity 14. At this time, the ball 13 cannot be in close contact with the ball groove and the inner wall of the outer ring 11 at the same time. Therefore, the rotating shaft 10 cannot transmit the torque to the outer ring 11, so that the outer ring 11 is disengaged from the rotational drive of the inner ring 12, that is, the rotating shaft 10 cannot drive the blower fan blade 2 to rotate clockwise together.

[0044] As Figure 4 shown, preferably, limiting grooves 17 for restricting the axial movement of the balls 13 along the rotating shaft 10 are provided on the side wall of the ball groove for contacting the balls 13 and on the inner wall of the outer ring 11 for contacting the balls 13. After the ball locking one-way mechanism is assembled, since the balls 13 are restricted in the limiting grooves 17 on both sides, the inner ring 12 and the outer ring 11 cannot move relative to each other axially either. Therefore, when the rotating shaft 10 is arranged vertically, it can support the blower fan blade 2.

[0045] As Figure 5As shown, preferably, the ball locking one-way mechanism further includes a first support plate 18 and a second support plate 19. The first support plate 18 is fixedly connected to the rotating shaft 10. The second support plate 19 is fixedly connected to the air supply fan blade 2 and is arranged to rotate relative to the rotating shaft 10. The first support plate 18 is provided with a first support portion for supporting the ball 13, and the second support plate 19 is provided with a second support portion for applying pressure to the ball 13. The first support plate 18 supports the second support plate 19 through the ball 13. The first support plate 18 is fixedly connected to one of the inner ring 12 and the outer ring 11, and the second support plate 19 is fixedly connected to the other of the inner ring 12 and the outer ring 11. In this solution, by setting the first support plate 18 and the second support plate 19, effective support for the air supply fan blade 2 can be achieved when the rotating shaft 10 is vertically arranged. Specifically, after the ball locking one-way mechanism is assembled, the ball 13 is supported above the first support portion of the first support plate 18. At the same time, the second support plate 19 is supported above the ball 13. The gravity of the second support plate 19 together with the air supply fan blade 2 is applied to the ball 13 through the second support portion, and this pressure is transmitted to the first support plate 18 through the ball 13, thereby realizing the use of the first support plate 18 to support the second support plate 19 and the air supply fan blade 2. When the structural arrangement of this solution is adopted, the first support plate 18 provides support for the second support plate 19 through the ball 13. The ball 13 is in point contact with the first support plate 18, the second support plate 19, the inner ring 12, and the outer ring 11, so that there is no surface contact between the two relatively moving parts in this mechanism, and the running noise of the device can be effectively reduced.

[0046] As Figure 6 shown, in another preferred solution, the ball locking one-way mechanism further includes a first support plate 18, a second support plate 19, and a limit ring 20. The first support plate 18 is fixedly connected to the air supply fan blade 2 and is arranged to rotate relative to the rotating shaft 10. The second support plate 19 is fixedly connected to the rotating shaft 10. The first support plate 18 is provided with a first support portion for supporting the ball 13. The limit ring 20 is fixedly connected to the rotating shaft 10 and is used to support the first support plate 18. The first support plate 18 is fixedly connected to one of the inner ring 12 and the outer ring 11, and the second support plate 19 is fixedly connected to the other of the inner ring 12 and the outer ring 11. In this solution, by setting the limit ring 20, effective support for the air supply fan blade 2 can be achieved when the rotating shaft 10 is vertically arranged. Specifically, after the ball locking one-way mechanism is assembled, the first support plate 18 is supported above the limit ring 20. The limit ring 20 is fixedly connected to the rotating shaft 10, and the first support plate 18 is arranged to rotate relative to the limit ring 20. The gravity of the first support plate 18 together with the air supply fan blade 2 is transmitted to the rotating shaft 10 through the limit ring 20, thereby realizing the use of the limit ring 20 to support the first support plate 18 and the air supply fan blade 2.

[0047] As Figure 7As shown, the overrunning mechanism 9 in this specific embodiment specifically uses a free-travel one-way clutch. The free-travel one-way clutch includes a ratchet wheel 22 and an outer ring 11 rotatably connected to the ratchet wheel 22. A plurality of curved ratchet teeth 21 are provided on the outer periphery of the ratchet wheel 22. A ball 13 is provided between the outer ring 11 and the ratchet teeth 21. When the ratchet wheel 22 rotates counterclockwise Figure 7 as shown in Figure 7 , the ball 13 is wedged between the ratchet teeth 21 and the outer ring 11, causing the outer ring 11 to rotate synchronously with the ratchet wheel 22; when the ratchet wheel 22 rotates Figure 7 clockwise as shown in Figure 7 , the ball 13 is released from the ratchet teeth 21 and the outer ring 11, and the ratchet wheel 22 rotates freely while the outer ring 11 remains stationary. The blower fan blade 2 is fixedly connected to the outer ring 11, and the rotating shaft 10 is fixedly connected to the ratchet wheel 22.

[0048] As Figure 8 shown, the overrunning mechanism 9 in this specific embodiment uses a ratchet mechanism. The first ratchet mechanism includes an inner ring 12 and an outer ring 11 rotatably connected to the inner ring 12. A plurality of inner ratchet teeth 23 are provided on the inner periphery of the outer ring 11. A claw hole is provided on the outer periphery of the inner ring 12. A cylindrical pawl 25 is slidably connected along the radial direction in the claw hole. An elastic member (such as a spring 24) is provided between the cylindrical pawl 25 and the claw hole. The blower fan blade 2 is fixedly connected to the outer ring 11, and the rotating shaft 10 is fixedly connected to the inner ring 12. When the rotating shaft 10 rotates clockwise, the pawl 25 extends out of the claw hole, and the inner ring 12 transmits the torque to the outer ring 11 through the pawl 25, so that the outer ring 11 together with the blower fan blade 2 rotates clockwise following the rotating shaft 10; when the rotating shaft 10 rotates counterclockwise, the pawl 25 is subjected to the radial pressure of the inner wall of the outer ring 11, causing the pawl 25 to retract into the claw hole against the elastic force of the spring 24. Therefore, the inner ring 12 cannot transmit the torque to the outer ring 11 through the pawl 25, so that the blower fan blade 2 and the outer ring 11 are disengaged from the rotational drive of the inner ring 12 and cannot rotate counterclockwise following the rotating shaft 10.

[0049] As Figure 9As shown, the overrunning mechanism 9 in this specific embodiment adopts the second ratchet mechanism. The second ratchet mechanism includes an inner ring 12 and an outer ring 11 rotatably connected to the inner ring 12. A plurality of inner ratchet teeth 23 are provided on the inner periphery of the outer ring 11, and a plurality of pawls 25 are provided on the outer periphery of the inner ring 12. The tail end of each pawl 25 is rotatably connected to the inner ring 12 and the other end is connected to the inner ring 12 through an elastic member (such as a spring 24). The elastic member is used to push the tail end of the pawl 25 outward. The air supply fan blade 2 is fixedly connected to the outer ring 11, and the rotating shaft 10 is fixedly connected to the inner ring 12. When the rotating shaft 10 rotates in the clockwise direction, since the tail end of the pawl 25 acts on the side surface of the inner ratchet tooth 23, the inner ring 12 can transmit the torque to the outer ring 11 through the limiting action of the pawl 25 and the inner ratchet tooth 23. Therefore, the outer ring 11 together with the air supply fan blade 2 can rotate in the clockwise direction following the rotating shaft 10; when the rotating shaft 10 rotates in the counterclockwise direction, since the pawl 25 is radially pressed by the inner wall of the outer ring 11, the pawl 25 moves closer to the center direction of the inner ring 12 against the elastic force of the elastic member, and further enables the pawl 25 to smoothly pass through each inner ratchet tooth 23. Therefore, the inner ring 12 cannot transmit the torque to the outer ring 11, and the outer ring 11 together with the air supply fan blade 2 cannot rotate counterclockwise following the rotating shaft 10.

[0050] Preferably, the heat dissipation fan blade 4 is a radial centrifugal fan blade, that is, the outlet angle of the heat dissipation fan blade 4 is 90°. Simply put, from the radial cross-section of the heat dissipation fan blade 4, the included angle between the extension line of the outer side of the fan blade and the reverse tangent of the rotation direction of the fan blade at this point is a right angle. By selecting the radial centrifugal fan blade in this solution, when the motor 6 rotates forward and backward, the heat dissipation fan blade 4 can generate heat dissipation air, thereby improving the heat dissipation effect on the motor 6.

[0051] Preferably, the air supply mechanism further includes a motor 6, and the rotating shaft 10 is the main shaft of the motor 6.

[0052] Preferably, the air supply mechanism further includes a heat dissipation air hood 3. The heat dissipation air hood 3 covers the outer periphery of the heat dissipation fan blade 4. The rotating shaft 10 penetrates through the heat dissipation air hood 3 and forms a heat dissipation air inlet 5 with the heat dissipation air hood 3, that is, the heat dissipation air inlet 5 is provided on the heat dissipation air hood 3. At the same time, a heat dissipation air outlet 7 is provided on the outer periphery of the heat dissipation air hood 3. The heat dissipation fan blade 4 can suck in the cooling air through the heat dissipation air inlet 5. The cooling air moves from the tail end to the head end of the motor 6, which can improve the motor heat dissipation efficiency. The heat exchange cooling air is then discharged from the heat dissipation air outlet 7 on the outer periphery of the heat dissipation air hood 3.

[0053] The present invention also provides an air fryer oven including the above air supply mechanism. The air fryer oven further includes a container 8 and a housing. The air supply mechanism is preferably arranged in the cavity between the container 8 and the housing. The air fryer oven can also be provided with an air supply air hood 1 covering the outer periphery of the air supply fan blade 2, as Figure 1As shown, the air supply hood 1 is communicated with the container 8 through ventilation holes. The derivation process of the beneficial effects generated by this air fryer oven is generally similar to the derivation process of the beneficial effects brought by the above-mentioned air supply mechanism, so it will not be elaborated herein.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air supply mechanism, characterized in that, It includes a rotating shaft (10), a blowing fan blade (2) and a heat dissipation fan blade (4). The heat dissipation fan blade (4) is fixedly connected to the rotating shaft (10). The blowing fan blade (2) is mounted on the rotating shaft (10) through an overrunning mechanism (9). The overrunning mechanism (9) can drive the blowing fan blade (2) to rotate together with the rotating shaft (10) when the rotating shaft (10) rotates in the first rotation direction. Moreover, the overrunning mechanism (9) can disengage the blowing fan blade (2) from the rotational drive of the rotating shaft (10) when the rotating shaft (10) rotates in the second rotation direction. The overrunning mechanism (9) is a ball locking one-way mechanism. The ball locking one-way mechanism includes an inner ring (12) and an outer ring (11) rotatably connected coaxially to the outer ring of the inner ring (12). A plurality of balls (13) are provided between the inner ring (12) and the outer ring (11). The outer ring of the inner ring (12) is provided with a plurality of ball grooves extending circumferentially and distributed at intervals. The ball grooves and the inner wall of the outer ring (11) form a cavity (14) for accommodating the balls (13). The tail end to the head end of each cavity (14) extends along the same rotation direction around the inner ring (12), and the width of each cavity (14) in the radial direction of the inner ring (12) gradually decreases from the tail end to the head end. The width of the tail end of the cavity (14) in the radial direction of the inner ring (12) is greater than the diameter of the ball (13), and the width of the head end of the cavity (14) in the radial direction of the inner ring (12) is less than or equal to the diameter of the ball (13). The rotating shaft (10) is coaxially and fixedly connected to the inner ring (12) or the outer ring (11). Correspondingly, the blowing fan blade (2) is fixedly connected to the other one of the inner ring (12) and the outer ring (11). Limiting grooves (17) for restricting the axial movement of the balls (13) along the rotating shaft (10) are provided on the side walls of the ball grooves for contacting the balls (13) and on the inner walls of the outer ring (11) for contacting the balls (13). After the ball locking one-way mechanism is assembled, since the balls (13) are restricted in the limiting grooves (17) on both sides, the inner ring (12) and the outer ring (11) cannot move relative to each other axially.

2. The air supply mechanism according to claim 1, characterized in that Limiting grooves (17) for restricting the axial movement of the balls (13) along the rotating shaft (10) are provided on the side walls of the ball grooves for contacting the balls (13) and on the inner walls of the outer ring (11) for contacting the balls (13).

3. The air supply mechanism according to claim 1, characterized in that, The ball locking one-way mechanism further includes a first support plate (18) and a second support plate (19). The first support plate (18) is fixedly connected to the rotating shaft (10). The second support plate (19) is fixedly connected to the blower fan blade (2) and is arranged to rotate relative to the rotating shaft (10). The first support plate (18) is provided with a first support portion for supporting the ball (13). The second support plate (19) is provided with a second support portion for applying pressure to the ball (13). The first support plate (18) supports the second support plate (19) through the ball (13). The first support plate (18) is fixedly connected to one of the inner ring (12) and the outer ring (11), and the second support plate (19) is fixedly connected to the other of the inner ring (12) and the outer ring (11). Alternatively, the ball locking one-way mechanism further includes a first support plate (18), a second support plate (19) and a limiting ring (20). The first support plate (18) is fixedly connected to the blower fan blade (2) and is arranged to rotate relative to the rotating shaft (10). The second support plate (19) is fixedly connected to the rotating shaft (10). The first support plate (18) is provided with a first support portion for supporting the ball (13). The limiting ring (20) is fixedly connected to the rotating shaft (10) and is used for supporting the first support plate (18). The first support plate (18) is fixedly connected to one of the inner ring (12) and the outer ring (11), and the second support plate (19) is fixedly connected to the other of the inner ring (12) and the outer ring (11).

4. The air supply mechanism according to claim 1, characterized in that, The heat dissipation fan blade (4) is a radial centrifugal fan blade.

5. The air supply mechanism according to claim 1, wherein It further includes a motor (6), and the rotating shaft (10) is the main shaft of the motor (6).

6. The air supply mechanism according to claim 5, characterized in that, It further includes a heat dissipation air hood (3). The heat dissipation air hood (3) covers the outer periphery of the heat dissipation fan blade (4). The rotating shaft (10) penetrates through the heat dissipation air hood (3) and forms a heat dissipation air inlet (5) between the rotating shaft (10) and the heat dissipation air hood (3). The outer periphery of the heat dissipation air hood (3) is provided with a heat dissipation air outlet (7).

7. An air fryer oven, characterized in that, It includes a blower mechanism as described in any one of claims 1 to 6.

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