Rectangular cuboid high-performance air fryer

Abstract

The utility model relates to a cuboid high-performance air fryer, which aims to solve the poor design of the flow guide cover structure on the top of the pot body of the existing similar products, resulting in poor heat efficiency and fluid strength effect in the lower pot body, and poor cooking effect of food in the pot body. The key points are that the groove slot of the heat shield on the top of the pot body of the air fryer is in an oval shape, the top plane of the heat shield is in an arc-shaped curved tangent transition surface on the two sides, the groove sides of the heat shield are outwardly convex circular arc surfaces, the long side of the oval groove slot of the flow guide cover is 15-25% of the impeller diameter, and the short side of the oval is 11-15% of the impeller diameter; the tangent transition surfaces on the two sides of the groove of the flow guide cover and the inner pot opening inner wall of the inner pot of the pot body assembly have a spacing of 10-15 mm, the circular arc surfaces on the two sides of the flow guide cover are aligned with the inner pot opening inner wall of the lower pot body assembly; the flow guide cover, the corresponding heat shield, and the machine body exhaust from the side.

Description

Technical Field

[0001] This utility model relates to an air fryer, specifically a rectangular high-performance air fryer. Background Technology

[0002] An air fryer is a new type of household appliance that uses high-speed air circulation technology to fry food. Compared to traditional electric fryers, it reduces oil content by up to 80%, is easy to clean, and is both safe and economical, making it very popular. Currently, traditional air fryers are generally designed in square or round shapes to ensure performance, but these shapes take up a large area due to their width. For example, Chinese patent application number 202510171096.6, published on April 25, 2025, entitled "A High-Performance Air Fryer," describes an air fryer where one end of the metal insulated top cover is bent downwards, and the other end's back opening is integrated with the top of the hot air hood. At the connection point, the lower opening of the hot air hood is integrated with the back of the metal insulated inner lining of the metal insulated cover. Although the above-mentioned product has added a downward-curving structure at the front of the metal heat-insulating top cover above the pot opening, the thermal efficiency and fluid strength of the pot body below are poor, resulting in poor cooking effect of food inside the pot, which needs to be further improved. Summary of the Invention

[0003] To overcome the aforementioned shortcomings, the purpose of this utility model is to provide a rectangular high-performance air fryer that solves the technical problem of poor design of the upper air guide shroud structure in existing similar products, resulting in poor thermal efficiency and fluid strength within the lower part of the fryer, and consequently, poor cooking performance. This objective is achieved through the following technical solution.

[0004] A high-performance cuboid air fryer is disclosed. The air fryer has a cuboid body with a pot assembly inside an opening on one side of the front. An air guide shroud is located above the inner pot of the air fryer's head. An impeller and heating element are housed within a groove in the air guide shroud above the inner pot. The impeller is a metal fan blade, and the air guide shroud is also a metal air guide shroud. A stirring fan is located within a heat insulation shroud at the top of the air guide shroud. A shaded-pole motor is located at the top of the heat insulation shroud, and its motor shaft is connected to both the impeller and the stirring fan blade. The shaded-pole motor and heating element are connected to a circuit board and control panel inside the head via wiring. The heat insulation shroud and the metal lining of the inner wall at the lower opening of the air fryer form a heat insulation cavity. A grill rack may be located at the bottom of the inner pot. Key structural design features include an elliptical groove in the heat insulation shroud, tangentially curved transition surfaces on the front and rear sides of the top plane of the heat insulation shroud, and outwardly convex arc surfaces on the sides of the groove. The impeller described above is a radial centrifugal impeller, which increases the wind speed. The stirring fan blade is a plastic inertial flow heat dissipation impeller. The tangential transition surface of the heat shield avoids the fluid from turning sharply and causing serious losses. The arc surface of the heat shield should not be set with a vertical straight line, as the slope of a vertical straight line is too large, and the fluid loss will be too large.

[0005] The long side of the ellipse at the groove opening of the flow guide is 15-25% of the impeller diameter, and the short side is 11%-15% of the impeller diameter. This structure further improves the thermal efficiency and fluid strength of the boiler.

[0006] A 10-15mm gap is maintained between the tangential transition surfaces on both sides of the groove of the flow guide and the inner wall of the inner pot of the pot assembly. The two sides of the arc surface of the flow guide are aligned with the inner wall of the inner pot of the lower pot assembly. The aforementioned 10-15mm gap allows the fluid to change direction more smoothly, while the absence of a gap between the two sides of the arc surface of the flow guide and the inner pot of the lower pot assembly ensures smooth fluid deflection.

[0007] The arc length of the rear tangent transition surface at the groove opening of the flow guide is greater than the arc length of the front tangent transition surface. The rear tangent transition surface arc is provided with an end mounting hole for the heating tube, and the front tangent transition surface arc is provided with a fixing bracket for the heating tube.

[0008] The air outlet on one side of the curved surface of the air guide is aligned and connected with the exhaust port of the heat insulation cover, and the exhaust port of the heat insulation cover is aligned and connected with the exhaust cover of the machine body. Thus, the air outlet of the air guide is placed on the side, and corresponding to the exhaust port of the heat insulation cover and the exhaust cover of the machine body, the airflow intensity is relatively large, thereby quickly carrying the oil fumes and water vapor in the air fryer out of the pot.

[0009] An NTC temperature sensor is provided on one side of the groove in the air guide shroud. The NTC temperature sensor is connected to the circuit board and control panel via a circuit.

[0010] The impeller has main blades, formed by stamping and arranged in a triangular shape on the same plane, evenly distributed around the central shaft hole. At least one side of each main blade has a first auxiliary blade, formed by stamping and bending at a 90-degree angle, and the first auxiliary blade is a right-angled trapezoid. Symmetrically on the other side of the first auxiliary blade is a second auxiliary blade, also formed by stamping and bending a right-angled triangle. The height of the right-angled edge of the first auxiliary blade is lower than the height of the right-angled edge of the second auxiliary blade. The right-angled edges of the first and second auxiliary blades are symmetrically positioned on both sides of the outer diameter end of the main blade. The first auxiliary blade is the primary power source for the fluid, while the second auxiliary blade interferes with and breaks up the large-diameter turbulence generated by the impeller, reducing noise and enhancing fluid strength. In other words, the first auxiliary blade is a semi-open impeller, and the second auxiliary blade is an open impeller. This impeller performs better and more effectively than similar products in both clockwise and counterclockwise rotation. When rotating clockwise, the efficiency of the semi-open impeller is higher than that of an open impeller. When rotating counterclockwise, the main blade becomes an open impeller, reducing energy efficiency.

[0011] The impeller has eight main blades equidistantly arranged around the shaft hole, and corresponding first and second auxiliary blades; the angle between the first and second auxiliary blades of the impeller is 16°-24°, and the edge of the second auxiliary blade of the impeller has an angle of 172 degrees.

[0012] The triangular main blades of the impeller are provided with stamped triangular grooves, which are integrally formed with the irregular groove in the middle of the impeller.

[0013] The heating tube is a double-wound heating tube, with the double bend at the center of the heating tube located below the center of the impeller. The heating tube extends outward in parallel from the double bend. The use of a double-wound heating tube reduces the height of the heating tube, thereby reducing the height of the flow guide and shortening the fluid transport path.

[0014] This utility model has a reasonable structural design, is easy to manufacture and assemble, and has a wide range of applications. In particular, it has good thermal efficiency and fluid strength in the pot body, and the inner pot is closer to a rectangle, which makes it easier to place a larger volume air fryer in the same space on the kitchen countertop. It is suitable for use as a rectangular high-performance air fryer, as well as for structural improvements of similar products. Attached Figure Description

[0015] Figure 1 This is a side view of the internal structure of the body according to an embodiment of the present invention. The dotted lines in the figure represent the internal structure of the body.

[0016] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure.

[0017] Figure 3 yes Figure 1 The diagram shows the internal structure of the nose cone, with the dotted lines representing the internal structure of the heat shield.

[0018] Figure 4 yes Figure 3 A schematic diagram of the three-dimensional structure.

[0019] Figure 5 yes Figure 4 A schematic diagram of the internal structure of the bottom fairing, with the dotted line representing the impeller.

[0020] Figure 6 This is a three-dimensional structural diagram of the air guide cover of this utility model.

[0021] Figure 7 yes Figure 6 This is a schematic diagram of the internal structure of the bottom fairing.

[0022] Figure 8 yes Figure 5 Schematic diagram of the cross-sectional structure of the fairing Figure 1 .

[0023] Figure 9 yes Figure 5 Schematic diagram of the cross-sectional structure of the fairing Figure 2 .

[0024] Figure 10 This is a three-dimensional structural diagram showing the position and state of the impeller and heating tube of this utility model.

[0025] Figure 11 yes Figure 10 A schematic diagram of the top structure.

[0026] Figure 12 yes Figure 10 A schematic diagram of the three-dimensional structure of the impeller.

[0027] Figure 13 yes Figure 12 A top-view schematic diagram of the impeller structure.

[0028] Figure 14 This is a table comparing the simulation cloud map effects of this utility model and existing technologies.

[0029] Attached figures and their names: 1. Draft shield, 101. Groove, 102. Tangential transition surface, 103. Arc surface, 2. Impeller, 201. Shaft hole, 202. Main blade, 203. First auxiliary blade, 204. Second auxiliary blade, 3. Heating tube, 4. Heat insulation cover, 5. Stirring fan blade, 6. Shaded pole motor, 7. NTC temperature sensor, 8. Air outlet, 9. Fixing bracket. Implementation

[0030] The structure and use of this utility model will now be further described with reference to the accompanying drawings. Figures 1-13 As shown, the air fryer has a rectangular body. A pot assembly is located in the front opening on one side of the body. A guide shroud 1 is located in the head of the machine body above the inner pot of the pot assembly. An impeller 2 and a heating tube 3 are located in the groove 101 of the guide shroud above the inner pot. An NTC temperature sensor 7 is located on one side of the groove of the guide shroud. The impeller is a metal fan blade. The guide shroud is a metal guide shroud. A stirring fan blade 5 is located in the heat insulation cover 4 at the top of the guide shroud. A shaded pole motor 6 is located at the top of the heat insulation cover. The motor shaft of the shaded pole motor is connected to both the impeller and the stirring fan blade. The NTC temperature sensor, the shaded pole motor, and the heating tube are connected to the circuit board and control panel inside the head of the machine body through wiring. The heat insulation cover and the metal lining of the inner wall at the lower opening of the machine body form a heat insulation cavity. A grill rack may be located at the bottom of the inner pot. The groove opening of the aforementioned heat insulation cover is elliptical. The front and rear sides of the top plane of the heat insulation cover are curved tangential transition surfaces 102, and the sides of the groove of the heat insulation cover are outwardly convex arc surfaces 103. The long side of the ellipse at the groove opening of the flow guide cover is 15-25% of the impeller diameter, and the short side of the ellipse is 11%-15% of the impeller diameter. A gap of 10-15mm is left between the tangential transition surfaces on the front and rear sides of the groove of the flow guide cover and the inner wall of the inner pot of the pot assembly. At the same time, the arc length of the rear tangential transition surface at the groove opening of the flow guide cover is greater than the arc length of the front tangential transition surface. The rear tangential transition surface arc has an end mounting hole for the heating tube, and the front tangential transition surface arc has a fixing bracket 9 for the heating tube.

[0031] The air outlet 8 on one side of the arc surface of the above-mentioned air guide is aligned and connected with the exhaust port of the heat insulation cover, and the exhaust port of the heat insulation cover is aligned and connected with the exhaust cover of the machine body.

[0032] The impeller has eight main blades 202, formed by stamping and arranged in a triangular shape on the same plane, evenly distributed around the central shaft hole 201. Each main blade has a first auxiliary blade 203, formed by stamping and bending at a 90-degree angle, along at least one edge. The first auxiliary blade is a right-angled trapezoid. A second auxiliary blade 204, also formed by stamping and bending a right-angled triangle, is symmetrically positioned on the other side of the first auxiliary blade. The height of the right-angled edge of the first auxiliary blade is lower than the height of the right-angled edge of the second auxiliary blade. The right-angled edges of the first and second auxiliary blades are symmetrically located on both sides of the outer diameter end of the main blades. The impeller has eight main blades evenly spaced around the shaft hole, along with corresponding first and second auxiliary blades. The angle between the first and second auxiliary blades is 16°-24°, and one edge of the second auxiliary blade has a 172-degree angle. The triangular main blades of the impeller each have a stamped triangular groove, which is integrally formed and communicates with the irregular groove in the middle of the impeller.

[0033] The heating tube mentioned above is a double-wound heating tube. The double bend in the center of the heating tube is located below the center of the impeller, and the heating tube is led out parallel to the outside from the double bend.

[0034] To use, remove the pot assembly, place the food in the inner pot or the rack inside the inner pot, put the pot assembly back into the main unit, and press the button to select the corresponding cooking function on the control panel.

[0035] The air fryer's airflow hood features an optimal elliptical structure design, which solves the problem of placing a larger capacity air fryer in the same space on the countertop, making it difficult for existing similar products to achieve performance comparable to rectangular inner pots.

[0036] like Figure 14 As shown in the simulation temperature cloud map, the improved product has significantly improved thermal efficiency and fluid strength compared with the existing technology of similar products.

[0037] The above description is intended to illustrate the technical means of this utility model and is not intended to limit the technical scope of this utility model. Any obvious improvements or substitutions made to this utility model by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of this utility model.

Claims

1. A high-performance cuboid air fryer, wherein the air fryer body is cuboid, a pot assembly is provided in the front opening on one side of the body, a guide shroud (1) is provided in the head of the body above the inner pot of the pot assembly, an impeller (2) and a heating tube (3) are provided in the groove (101) of the guide shroud above the inner pot, the impeller is a metal fan blade, the guide shroud is a metal guide shroud, a stirring fan blade (5) is provided in the heat insulation cover (4) at the top of the guide shroud, a shaded pole motor (6) is provided at the top of the heat insulation cover, the motor shaft of the shaded pole motor is connected to the impeller and the stirring fan blade, the shaded pole motor and the heating tube are connected to the circuit board and control panel inside the head through wiring, the heat insulation cover and the metal lining of the inner wall at the lower opening of the body form a heat insulation cavity, and a grill rack is provided at the bottom of the inner pot; characterized in that The groove (101) of the heat insulation cover (4) is elliptical, the front and rear sides of the top plane of the heat insulation cover are curved tangent transition surfaces (102), and the sides of the groove of the heat insulation cover are outwardly convex arc surfaces (103).

2. The rectangular high-performance air fryer according to claim 1, characterized in that... The long side of the ellipse at the groove (101) opening of the shroud (1) is 15-25% of the diameter of the impeller (2), and the short side of the ellipse is 11%-15% of the diameter of the impeller.

3. The rectangular high-performance air fryer according to claim 2, characterized in that... The tangent transition surfaces (102) on the front and rear sides of the groove (101) of the flow guide (1) are spaced 10-15mm apart from the inner wall of the pot opening of the inner pot of the pot body assembly. The arc surface (103) of the flow guide is aligned with the inner wall of the pot opening of the inner pot of the lower pot body assembly on both sides.

4. The rectangular high-performance air fryer according to claim 3, characterized in that... The arc length of the rear tangent transition surface (102) at the groove (101) opening of the flow guide (1) is greater than the arc length of the front tangent transition surface. The rear tangent transition surface arc is provided with the end mounting hole of the heating tube (3), and the front tangent transition surface arc is provided with the fixing bracket (9) of the heating tube.

5. The rectangular high-performance air fryer according to claim 1, characterized in that... The air outlet (8) on one side arc surface (103) of the air guide (1) is aligned and connected with the exhaust port of the heat insulation cover (4), and the exhaust port of the heat insulation cover is aligned and connected with the exhaust cover of the machine body.

6. The rectangular high-performance air fryer according to claim 1, characterized in that... An NTC temperature sensor (7) is provided on one side of the groove (101) of the flow guide (1). The NTC temperature sensor is connected to the circuit board and control panel through a line.

7. The rectangular high-performance air fryer according to claim 1, characterized in that... The impeller (2) has main blades (202) that are stamped and triangular in the same plane, distributed at equal intervals around the central shaft hole (201). At least one side of the main blade has a first auxiliary blade (203) that is stamped and bent at 90 degrees. The first auxiliary blade is a right trapezoid. The other side of the first auxiliary blade has a second auxiliary blade (204) that is stamped and bent into a right triangle. The height of the right angle side of the first auxiliary blade is lower than the height of the right angle side of the second auxiliary blade. The right angle side of the first auxiliary blade and the right angle side of the second auxiliary blade are symmetrically arranged on both sides of the outer diameter end of the main blade.

8. The rectangular high-performance air fryer according to claim 7, characterized in that... The impeller (2) is provided with eight main blades (202) arranged equidistantly with the shaft hole (201) as the center, and corresponding first auxiliary blades (203) and second auxiliary blades (204); the included angle between the first auxiliary blade and the second auxiliary blade of the impeller is 16°-24°, and the second auxiliary blade of the impeller has an included angle of 172 degrees on one side of its edge.

9. The rectangular high-performance air fryer according to claim 8, characterized in that... The triangular main blades (202) of the impeller (2) are respectively provided with stamped triangular grooves, which are integrally formed with the irregular groove in the middle of the impeller.

10. The rectangular high-performance air fryer according to claim 1, characterized in that... The heating tube (3) is a double-wound heating tube. The double bend in the center of the heating tube is located below the center of the impeller (2). The heating tube is led out parallel to the outside from the double bend.

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