A hot air convection fan and an air-frying microwave oven

Abstract

The utility model provides a kind of hot air convection fan and air fryer microwave oven, the fan includes hub, fan blade and recess;Fan blade, recess are set n, n is positive integer, n fan blade, n recess are evenly distributed and set on the outside wall of hub along circumference;The setting position of each recess corresponds with the setting position of each fan blade;The inside wall of hub is connected with the outside wall of rotating shaft of rotating motor by heat insulation component, fan blade includes first flanging, blade main body and second flanging;First flanging is connected with second flanging by blade main body;First flanging, second flanging all have certain angle with blade main body;A kind of hot air convection fan and air fryer microwave oven described in the utility model, the structure of fan can be optimized, the heat exchange efficiency inside microwave oven is improved, the cooking time of food is shortened, the uniformity of food heating is guaranteed, the cooking quality of food is improved, and the taste of food is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of air fryer microwave ovens, specifically to a hot air convection fan and an air fryer microwave oven. Background Technology

[0002] As user demands increase, the types of microwave ovens are becoming more and more diverse. Among them, the air fryer microwave oven is a kitchen appliance that combines the functions of a microwave oven and an air fryer. Current air fryer microwave ovens use a single-blade design for their hot air fan, which results in significant airflow organization defects during operation. This structure prevents hot air from being effectively transferred from the heating chamber to the interior of the oven cavity, leading to slow heat circulation between the heating chamber and the oven cavity.

[0003] This low heat exchange efficiency directly impacts cooking performance. On one hand, it prolongs cooking time; on the other hand, it leads to uneven heating, affecting the final texture and quality of the food, including key indicators such as crispness of the outer crust and evenness of internal cooking. Therefore, researching how to improve the slow heat circulation environment within the heating chamber and oven cavity, thereby increasing heat exchange efficiency, shortening cooking time, and improving cooking quality, is of great significance.

[0004] Patent CN222937862U discloses an air fryer microwave oven, including a cavity. A hot air structure is located at the top of the cavity, and the hot air structure includes a heating element located within the cavity. The cavity includes a top plate, a portion of which protrudes upwards to form a first clearance portion for accommodating the heating element. The hot air structure also includes a housing assembly, a partition, and a fan. The partition is disposed between the housing assembly and the top plate to form two hot air chambers respectively communicating with the cavity. The fan is disposed within each hot air chamber, and the two fans rotate in opposite directions. By improving the structure of the top plate, the heating element is directly installed within the cavity, resulting in a closer proximity to the food being cooked without obstruction. The generated heat radiation can directly act on the food surface, improving the microwave oven's safety. However, because the fan blades have a single-flanged structure, airflow organization defects can easily occur during operation, leading to slow heat circulation between the heating chamber and the cavity, affecting the microwave oven's internal heat exchange efficiency. Utility Model Content

[0005] In view of this, the present invention aims to propose a hot air convection fan and an air fryer microwave oven to solve the problem that the fan blades in existing air fryer microwave ovens are mostly of a single-flanged structure. During fan operation, this can easily lead to the ineffective conduction of hot air from the heating cavity to the oven cavity, resulting in slow heat circulation between the heating cavity and the oven cavity. This, in turn, affects heat exchange efficiency, prolongs food cooking time, and easily causes uneven heating of food. The present invention optimizes the fan structure to avoid the situation where hot air cannot be effectively conducted from the heating cavity to the oven cavity, accelerates the heat circulation speed between the heating cavity and the oven cavity, improves the heat exchange efficiency inside the microwave oven, shortens food cooking time, ensures uniform heating of food, improves food cooking quality, and preserves the taste of food.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] This utility model relates to a hot air convection fan and an air fryer microwave oven. The hot air convection fan includes a hub, fan blades, and grooves. There are n fan blades and n grooves, where n is a positive integer. The n fan blades and n grooves are evenly distributed along the circumference on the outer wall of the hub. The position of each groove corresponds to the position of each fan blade. Each groove is located at the end of the corresponding fan blade facing the hub. The inner wall of the hub is connected to the outer wall of the rotating shaft of a rotary motor via a heat insulation component. The fan blades include a first flange, a blade body, and a second flange. The first flange is connected to the second flange via the blade body. Both the first flange and the second flange have a certain angle with the blade body.

[0008] Furthermore, the required number of fan blades or grooves, n, ranges from 8 to 10.

[0009] Furthermore, the first flange bend is located on the side of the blade body facing the heat insulation component, and the second flange bend is located on the side of the blade body away from the heat insulation component.

[0010] Furthermore, the angle between the first flange and the main body of the blade is α, and the angle between the second flange and the main body of the blade is β, where α and β are both positive numbers.

[0011] Furthermore, α = β = 90°.

[0012] Furthermore, the first flange is wedge-shaped, and the second flange is rectangular.

[0013] Furthermore, the height of the first flange is less than the height of the second flange, and the length of the first flange is less than the length of the second flange.

[0014] Furthermore, the blade body includes blade one and blade two; one end of blade one is connected to the hub and the blade body of two adjacent fan blades respectively, and the other end of blade one is connected to blade two; blade two is bent to the side facing the heat insulation component to form a first flange, and blade two is bent to the side facing the microwave oven cavity to form a second flange.

[0015] Furthermore, the groove includes a first groove surface, a second groove surface, and a third groove surface; the second groove surface is bent and disposed on the fan blade, and the two ends of the first groove surface and the third groove surface are bent and disposed on the outer peripheral surfaces of the fan blade and the hub, respectively, and the first groove surface is connected to the third groove surface through the second groove surface; the first groove surface, the second groove surface, and the third groove surface all have a certain angle with the plane where the blade body is located.

[0016] An air fryer microwave oven includes a hot air convection fan, the fan being disposed inside the air fryer microwave oven.

[0017] Compared with the prior art, the hot air convection fan and air fryer microwave oven described in this utility model have the following beneficial effects:

[0018] By optimizing the fan configuration, the fan structure can be improved, preventing hot air from failing to be effectively conducted from the heating cavity to the oven cavity. This accelerates the heat circulation speed between the heating cavity and the oven cavity, improves the heat exchange efficiency inside the microwave oven, shortens the cooking time, ensures the uniformity of food heating, enhances the cooking quality of the food, and guarantees the taste of the food. Attached Figure Description

[0019] The accompanying drawings, which constitute a part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments and descriptions of the utility model are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0020] Figure 1 An exploded view of the hot air structure components inside an air fryer microwave oven;

[0021] Figure 2 This is a schematic diagram of the reverse-rotating fan structure in a hot air convection fan.

[0022] Figure 3 This is a schematic diagram of the forward-rotating fan junction in a hot air convection fan.

[0023] Figure 4 This is a diagram showing a section cut along the vertical direction of an air fryer microwave oven, with the straight line between the centers of the two fans as the cutting line.

[0024] Figure 5 This is a magnified view of point A in a cross-sectional view of an air fryer microwave oven.

[0025] Explanation of reference numerals in the attached drawings: 1. Hub; 11. Inner plane; 12. Outer circumferential surface; 13. Through hole; 2. Fan blade; 21. First flange; 22. Blade body; 221. First blade; 222. Second blade; 23. Second flange; 3. Groove; 31. First groove surface; 32. Second groove surface; 33. Third groove surface; 4. Heat insulation component; 41. Inner heat insulation cover; 42. Outer heat insulation cover; 5. Rotary motor; 51. Shaft; 52. Forward rotation motor; 53. Reverse rotation motor; 6. Heating element; 7. Baffle plate; 10. Forward rotation fan; 20. Reverse rotation fan. Detailed Implementation

[0026] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to convey the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] This embodiment is for an air fryer microwave oven. Similar to a conventional air fryer microwave oven, the overall structure consists of a cavity, a fan, and a heating element.

[0031] In the existing technology, cooking appliances with air fryer microwave functions have long cooking times and unsatisfactory cooking results when the air fryer mode is turned on. The main reason is that the heat circulation between the heating chamber and the oven cavity is slow.

[0032] To address the problem that existing air fryer microwave ovens often use single-flanged fan blades, which can hinder the effective transfer of hot air from the heating chamber to the oven cavity during operation, resulting in slow heat circulation between the heating chamber and the oven cavity, thus affecting heat exchange efficiency, prolonging cooking time, and causing uneven heating, this embodiment proposes a hot air convection fan and air fryer microwave oven. The hot air convection fan includes a hub 1, fan blades 2, and grooves 3. There are n fan blades 2 and n grooves 3, where n is a positive integer. The n fan blades 2 and n grooves 3 are evenly distributed along the circumference on the outer wall of the hub 1. The position of each groove 3 corresponds to the position of each fan blade 2; and each groove 3 is located at the end of the corresponding fan blade 2 facing the hub 1. That is, a groove 3 is provided at the connection point between each fan blade 2 and the hub 1. The inner wall of the hub 1 is connected to the outer wall of the shaft 51 of a rotary motor 5 via a heat insulation component 4, enabling directional rotation of the fan under the drive of the rotary motor 5. The fan blade 2 includes a first flange 21, a blade body 22, and a second flange 23. The first flange 21 is connected to the second flange 23 through the blade body 22. Both the first flange 21 and the second flange 23 have a certain angle with the blade body 22. The number n of fan blades 2 or grooves 3 required to be provided ranges from 8 to 10.

[0033] By optimizing the fan's structure, the system avoids situations where hot air cannot be effectively conducted from the heating chamber to the oven cavity, accelerating the heat circulation speed between the heating chamber and the oven cavity, improving the heat exchange efficiency inside the microwave oven, shortening cooking time, ensuring uniform heating, improving cooking quality, and preserving the taste of the food. Furthermore, the fan blades 2 of the hot air fan feature a double-flanged design, with the two flanges extending in opposite directions. When the fan is running, this structure generates bidirectional airflow, significantly improving the heat exchange efficiency between the heating chamber and the oven cavity. This improved design significantly enhances the heat circulation speed by increasing airflow turbulence and expanding the hot air coverage area. Compared to traditional single-flanged blades, the double-reverse-flanged structure effectively improves heat conduction efficiency, thereby effectively shortening cooking time and improving the uniformity of food heating, resulting in better cooking performance.

[0034] Specifically, both the first flange 21 and the second flange 23 are smoothly connected to the blade body 22 via a circular arc. The first flange 21 is bent on the side of the blade body 22 facing the heat insulation component 4, and the second flange 23 is bent on the side of the blade body 22 away from the heat insulation component 4. The angle between the first flange 21 and the blade body 22 is α, and the angle between the second flange 23 and the blade body 22 is β. Both α and β are positive numbers, and their specific values ​​are set according to requirements. Furthermore, the first flange 21 is wedge-shaped, and the second flange 23 is rectangular. The height of the first flange 21 is less than the height of the second flange 23, and the length of the first flange 21 is less than the length of the second flange 23. In this embodiment, α = β = 90°. That is, both the first flange 21 and the second flange 23 are perpendicular to the blade body 22. Height refers to the dimension of the component in the vertical direction. Length refers to the dimension of the component in the front-back or inside-out direction.

[0035] By extending the first flange 21 and the second flange 23 in opposite directions along the blade body 22, the two flanges on the blade body 22 can effectively accelerate the heat circulation between the heating chamber and the oven cavity when the fan rotates. The difference in shape and size between the first flange 21 and the second flange 23 ensures a certain distance between the fan and the heat insulation component 4, preventing the heat insulation component 4 from contacting the operating fan. In addition, the wedge-shaped first flange 21 and the rectangular second flange 23, in combination, prevent the formation of airflow organization defects and accelerate the hot air circulation efficiency of the heat circulation. This improves the heat exchange efficiency between the heating chamber and the oven cavity. It also simplifies the structure of the fan blade 2, thereby reducing the cost of the fan blade 2 and the space occupied by the fan in the microwave oven.

[0036] The blade body 22 includes a first blade 221 and a second blade 222. One end of the first blade 221 is connected to the hub 1 and the blade bodies 22 of two adjacent fan blades 2, respectively, and the other end of the first blade 221 is connected to the second blade 222. The second blade 222 is bent with a first flange 21 on the side facing the heat insulation component 4, and a second flange 23 on the side facing the microwave oven cavity. The width of the first blade 221 is initially consistent from the inside out and then gradually decreases. The width of the second blade 222 initially gradually decreases from the inside out, then remains consistent, then gradually increases, and finally remains consistent. In this embodiment, the width refers to the dimension of the component in the left-right direction.

[0037] By setting the irregular shape of blade 1 221 and blade 222, it is possible to ensure the tightness and reliability of the connection between each blade 2 and the hub 1, and also to ensure the strength of the connection between adjacent blades 2, which is conducive to improving the stability and safety of the overall structure of blade 2.

[0038] The hub 1 is a hollow structure. The hub 1 includes an inner plane 11, an outer peripheral surface 12, and a through hole 13. The two ends of the outer peripheral surface 12 are respectively connected to the outer side wall of the inner plane 11 and the arc of the fan blade 2. The through hole 13 is located at the center of the inner plane 11. The through hole 13 provides a passage for the rotating shaft 51 of the rotary motor 5 to pass through. The outer peripheral surface 12 is an arc surface, and the diameter of the end of the outer peripheral surface 12 facing the inner plane 11 is less than the diameter of the end of the outer peripheral surface 12 facing the fan blade 2.

[0039] By setting up the various components of hub 1, the air pressure can be concentrated and the eddy current resistance can be reduced, thereby optimizing the heat exchange efficiency of the airflow. It can also expand the air intake area, making the temperature distribution inside the microwave oven cavity more uniform, thereby improving the circulation efficiency of hot air. It also has the function of suppressing eddy current noise, improving the rigidity and strength of hub 1 structure, giving it a higher resistance to deformation, thereby reducing the vibration amplitude of the fan when rotating at high speed, and playing a role in noise reduction.

[0040] The groove 3 includes a first groove surface 31, a second groove surface 32, and a third groove surface 33. The second groove surface 32 is bent and disposed on the fan blade 2. The two ends of the first groove surface 31 and the third groove surface 33 are bent and disposed on the outer peripheral surface 12 of the fan blade 2 and the hub 1, respectively. The first groove surface 31 is connected to the third groove surface 33 through the second groove surface 32. The first groove surface 31, the second groove surface 32, and the third groove surface 33 all have a certain angle with the plane where the blade body 22 of the fan blade 2 is located. The angle between the first groove surface 31, the third groove surface 33 and the blade body 22 ranges from [90°, 180°].

[0041] By designing the grooves 3, the area of ​​the fan blades 2 can be effectively reduced, providing more airflow channels for heat exchange. This greatly improves the heat exchange efficiency between the heating chamber and the furnace chamber, ensuring uniform heating of food and thus enhancing user satisfaction. It also strengthens the connection between the fan blades 2 and the hub 1, ensuring stability and reliability.

[0042] An air fryer microwave oven includes a hot air convection fan, which is disposed inside the microwave oven. Specifically, the microwave oven also includes a hot air structure assembly. The hot air structure assembly is disposed above the cavity; the hot air structure assembly consists of a heating element 6, a hot air convection fan, a baffle plate 7, a heat insulation component 4, and a rotary motor 5. The heating element 6, the baffle plate 7, and the heat insulation component 4 are all disposed at the top of the cavity, and the fan and the rotary motor 5 are also disposed above the cavity. The heating element 6 is connected to the baffle plate 7; the heating element 6, the fan, and the baffle plate 7 are all disposed between the heat insulation component 4 and the cavity, and the rotary motor 5 is disposed on the side of the heat insulation component 4 away from the cavity, with the output end of the rotary motor 5 passing through the heat insulation component 4 and connected to the fan. The top of the baffle plate 7 has a folded edge with a rectangular groove for easy fixing to the heat insulation component 4, improving the stability of the baffle plate 7 during microwave oven operation.

[0043] By optimizing the components within the air fryer microwave oven, the safety of microwave oven use can be effectively improved, the efficiency of hot air exchange between the heating chamber and the oven cavity can be enhanced, cooking time can be shortened, and the quality of cooking can be improved.

[0044] The hot air structure assembly also includes a limiting member and a fixing member. The limiting member, fan, and fixing member are sequentially arranged from top to bottom on the outer wall of the rotating shaft 51 of the rotary motor 5. The limiting member and fixing member are used to fix the fan in the desired position on the rotary motor 5. An annular groove is provided on the rotating shaft 51, and the limiting member is disposed within the annular groove to improve the stability of the connection between the limiting member and the rotating shaft 51, thereby improving the overall installation efficiency of the hot air structure assembly. The fixing member is threadedly connected to the rotating shaft 51.

[0045] By setting up limiting and fixing parts, the tightness of the connection between the fan and the rotating shaft 51 of the rotary motor 5 can be improved, and the safety during the operation of the fan can also be improved.

[0046] Specifically, the heating element 6 is disposed in an arc-shaped groove at the top of the cavity. At least two heating elements 6, fans, and rotary motors 5 are provided. Preferably, two heating elements 6, fans, and rotary motors 5 are provided. The two heating elements 6 are arranged parallel to each other in the arc-shaped groove at the top of the cavity, and the baffle plate 7 is vertically disposed in the middle of the outer side wall of the two heating elements 6 to separate the two fans with different directions of rotation. This avoids the influence of the two fans on the hot air circulation direction when they work simultaneously, improving the efficiency of heat exchange between the heating cavity and the furnace cavity. The two fans are disposed between the two heating elements 6, and are respectively disposed on the left and right sides of the baffle plate 7. The positions of the two rotary motors 5 correspond to the positions of the two fans. The two rotary motors 5 are disposed on top of the heat insulation assembly 4. The rotation directions of the shafts 51 of the two rotary motors 5 are opposite. The two fans have identical structures and rotate in opposite directions. The two rotary motors 5 are a forward-rotating motor 52 and a reverse-rotating motor 53. The two fans are a forward-rotating fan 10 and a reverse-rotating fan 20. The forward-rotating motor 52 is connected to the forward-rotating fan 10 via the heat insulation component 4, and the reverse-rotating motor 53 is connected to the reverse-rotating fan 20 via the heat insulation component 4. In this embodiment, forward rotation refers to rotation in a clockwise direction, and reverse rotation refers to rotation in a counter-clockwise direction.

[0047] The dual-fan design effectively accelerates heat circulation between the heating cavity and the microwave oven body, and also breaks down the hot and cold stratification within the cavity more quickly, resulting in a more even temperature distribution and preventing food from being partially burnt or undercooked. This, in turn, helps to shorten cooking time, improve cooking quality, and ensure even cooking.

[0048] The heat insulation assembly 4 includes an inner heat insulation cover 41 and an outer heat insulation cover 42. The inner heat insulation cover 41 and the outer heat insulation cover 42 are sequentially arranged on the top of the cavity from bottom to top. The tops of both the inner heat insulation cover 41 and the outer heat insulation cover 42 are rectangular. The inner heat insulation cover 41 has a fully enclosed structure, forming a cavity with the top of the cavity. The fan, heating element 6, and baffle 7 are all disposed inside the cavity. The outer heat insulation cover 42 has a semi-enclosed structure, with its bottom fitting against the top of the inner heat insulation cover 41. The outer heat insulation cover 42 includes four notches, which are respectively located on the sidewalls at the four corners of the top of the outer heat insulation cover 42.

[0049] The inner heat shield 41 effectively isolates heat between the heating chamber and the hot air structure components, preventing excessive heat loss and facilitating efficient heat exchange via the hot air convection fan. The four notches on the outer heat shield 42 serve two purposes: heat dissipation and ventilation, and simplifying the structure of the heat insulation component 4, thus reducing its cost.

[0050] In this utility model, any air fryer microwave oven may include a hot air convection fan structure as described in this embodiment. Based on the relevant structures and assembly relationships of the first flange 21 and the second flange 23 provided in this embodiment, the air fryer microwave oven also includes conventional components such as the oven cavity, fan, and heating element 6. Since these are all prior art, they will not be described in detail here.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hot air convection fan, characterized by, It includes a hub (1), a fan blade (2) and a groove (3); there are n fan blades (2) and n grooves (3), where n is a positive integer. The n fan blades (2) and n grooves (3) are evenly distributed along the circumference on the outer wall of the hub (1); the position of each groove (3) corresponds to the position of each fan blade (2); and each groove (3) is located at the end of the corresponding fan blade (2) facing the hub (1); the inner wall of the hub (1) is connected to the outer wall of the rotating shaft (51) of the rotary motor (5) through the heat insulation component (4). The fan blade (2) includes a first flange (21), a blade body (22) and a second flange (23); the first flange (21) is connected to the second flange (23) through the blade body (22); the first flange (21) and the second flange (23) have a certain angle with the blade body (22).

2. A hot air convection fan according to claim 1, wherein The required number n of the fan blades (2) or grooves (3) is 8 to 10.

3. A hot air convection fan according to claim 1, wherein The first flange (21) is bent on the side of the blade body (22) facing the heat insulation component (4), and the second flange (23) is bent on the side of the blade body (22) away from the heat insulation component (4).

4. A hot air convection fan according to claim 1, wherein The angle between the first flange (21) and the blade body (22) is α, and the angle between the second flange (23) and the blade body (22) is β, where α and β are both positive numbers.

5. A hot air convection fan according to claim 4, wherein, The α=β=90°.

6. A hot air convection fan according to claim 1, wherein The first flange (21) is wedge-shaped, and the second flange (23) is rectangular.

7. A hot air convection fan according to claim 1, wherein The height of the first flange (21) is less than the height of the second flange (23), and the length of the first flange (21) is less than the length of the second flange (23).

8. A hot air convection fan according to claim 1, wherein, The blade body (22) includes a first blade (221) and a second blade (222); one end of the first blade (221) is connected to the blade body (22) of the hub (1) and the two adjacent fan blades (2) respectively, and the other end of the first blade (221) is connected to the second blade (222); the second blade (222) is bent to the side facing the heat insulation component (4) to form a first flange (21), and the second blade (222) is bent to the side facing the microwave oven cavity to form a second flange (23).

9. A hot air convection fan according to claim 1, wherein, The groove (3) includes a first groove surface (31), a second groove surface (32) and a third groove surface (33); the second groove surface (32) is bent and set on the fan blade (2), and the two ends of the first groove surface (31) and the third groove surface (33) are bent and set on the outer peripheral surface (12) of the fan blade (2) and the hub (1) respectively. The first groove surface (31) is connected to the third groove surface (33) through the second groove surface (32); the first groove surface (31), the second groove surface (32) and the third groove surface (33) all have a certain angle with the plane where the blade body (22) is located.

10. An air-frying microwave oven characterized by comprising: Includes a hot air convection fan according to any one of claims 1-9, said fan being disposed inside an air fryer microwave oven.

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