Centrifugal fan blade and air fryer thereof

Abstract

The utility model relates to a centrifugal fan blade and an air fryer thereof, which are designed for solving the technical problems of poorer performance of energy efficiency, wind field and temperature field and poorer cooking effect caused by poor structural design of hardware fan blades of the existing similar products. A body of the centrifugal fan blade is a stirring fan blade, the stirring fan blade is provided with blades which are formed by stamping and are bent towards one side of the bottom, and gaps which are arranged at equal intervals are formed between discs between the connected blades; the stirring blade is characterized in that the blade of the stirring blade is provided with at least two sub-blades with different sizes and the same height, and gaps with the same width and different areas corresponding to the sub-blades are arranged between the sub-blades; the sub-blades of the blades comprise a first blade, a second blade and a third blade, and a first gap, a second gap and a third gap corresponding to the first blade, the second blade and the third blade; the heights between the first blade and the third blade of the blades are the same and are sequentially increased, and the widths between the first gap and the third gap formed through corresponding stamping are the same and are sequentially increased.

Description

Technical Field

[0001] The utility model relates to a fan blade of an air fryer, in particular to a centrifugal fan blade and an air fryer thereof. Background Art

[0002] An air fryer is a new type of household appliance that uses high-speed air circulation technology to fry food. The food it makes can reduce 80% of the fat compared to traditional electric fryers. It is easy to clean in daily use, safe and economical, and is very popular. The fans in some existing air fryers are divided into open radial centrifugal impellers and closed backward curved centrifugal impellers according to their different structural designs; among them, the performance of air fryers mainly includes energy efficiency, temperature field uniformity, and wind field. The structure and speed of the fan have an impact on the above performance; energy efficiency, the larger the air volume, the higher the convection coefficient, and the higher the energy efficiency of the heating tube; wind field, the higher the wind speed, the smaller the turbulence diameter, and the more uniform the wind field; temperature field, the main energy transfer in the air fryer of the metal tube is mainly forced convection, and the more uniform the wind field, the more uniform the temperature field of the product will be. The cooking performance of air fryers mainly includes: 1. Promoting non-enzymatic browning. Wind can take away a large amount of moisture on the surface of the food, allowing the surface of the food to quickly dehydrate and increase the surface temperature of the food, resulting in non-enzymatic browning and hard shelling. In this way, the cooked food is crispy on the outside and tender on the inside, and has a strong caramel flavor; 2. Rapid dehydration. For some cooking scenes with large dehydration, air drying (overall dehydration), baking French fries (45% dehydration), and grilling (surface dehydration) all require strong wind field intensity. The current status of the air fryer industry is that more than 95% of air fryers use open radial centrifugal impellers, such as the application number 201820001542.4 disclosed in the Chinese patent literature, the authorization announcement date 2018.10.26, and the utility model name "a fan blade for an air fryer"; the advantages of this open radial centrifugal impeller are low cost, high wind speed, and relatively small central vortex; the disadvantage is that the air volume is relatively small. Another part of high-end air fryers use closed backward-curved centrifugal impellers, such as the application number 202322198012.7 disclosed in the Chinese patent literature, the authorization announcement date 2024.04.02, and the utility model name "A DC fan motor type air fryer"; this air fryer uses both of the above impellers, but the advantages of this closed backward-curved centrifugal impeller are high wind speed and large air volume; the disadvantages are high cost and large central vortex. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the utility model is to provide a centrifugal fan blade and an air fryer in the art, so as to solve the technical problems of the existing similar products, such as the poor structural design of the hardware fan blade, which leads to poor energy efficiency, wind field, temperature field, and poor cooking effect. The purpose is achieved through the following technical solutions.

[0004] A centrifugal fan blade, the main body of which is a stirring fan blade, the stirring fan blade is provided with a blade formed by stamping and bent toward the bottom side, and there are equidistant gaps between the discs between the connected blades, the blades and the discs are stamped and bent at 90 degrees, and an axial hole is provided at the center of the stirring blade; its structural design points are that the blade of the stirring fan blade is provided with at least two sub-blades of different sizes and the same height, and there are corresponding gaps of the same width and different areas between the sub-blades; the sub-blades of the blade include a first blade, a second blade and a third blade, a first gap is provided between the first blade and the second blade, a second gap is provided between the second blade and the third blade, and a third gap is provided between the connected blades; the first blade, the second blade and the third blade of the blade have the same height and increase in sequence, and the first blade, the second blade and the third blade have the same width and increase in sequence. The centrifugal fan blade of the above structure is suitable for air fryers with top air outlet or air fryers with back air outlet. The air fryer with top air outlet is used as an example below.

[0005] The outer side of the stirring fan blade is triangularly convex from the third gap side to the third gap side, and the corresponding ends of the first blade, the second blade and the third blade are triangularly convex respectively.

[0006] The third gap and the second gap of the stirring impeller are respectively in the form of a right-angled trapezoid with an outer opening, and the first gap is respectively in the form of a rectangle with an outer opening. The shape of the first blade corresponds to the shape of the first gap, and the shapes of the second blade and the third blade correspond to the shapes of the second gap and the third gap, respectively.

[0007] The height h of the first blade, the second blade and the third blade of the stirring fan blade is 10 mm.

[0008] The diameter r of the air inlet at the bottom of the third gap outside the shaft hole of the stirring fan blade is 22 mm.

[0009] The top of the stirring fan blade is provided with a communicating stamping groove, and the stamping groove is provided with a reinforcing protrusion formed by stamping. The first blade, the second blade and the third blade are respectively provided with stamping grooves, or the first blade and the second blade on one side of the shaft hole at the first gap and the third blade are respectively provided with stamping grooves, which can be set according to the strength requirements of the blades and the convenience of processing and production.

[0010] The stirring fan blade and the heating tube are arranged in the groove of the first inner lining bottom, the notch of the first inner lining bottom is aligned with the pot mouth above the inner pot of the pot body assembly in the machine body, the motor shaft at the shaded pole motor at the top of the first inner lining is connected to the shaft hole of the stirring fan blade through the first inner lining, the heating tube and the shaded pole motor are connected to the PCB control assembly in the machine head through the line, the first inner lining is connected with the second inner lining of the outer diameter of the pot body assembly, and the third inner lining at the bottom of the pot body assembly to form a heat insulation lining, and the pot body assembly is placed in the machine body through the opening on one side of the heat insulation lining; the first inner lining is a hardware insulation layer, and the second inner lining and the third inner lining are hardware insulation inner walls. The above-mentioned heating tube is a mosquito coil tube or a carbon tube.

[0011] A plastic insulation layer is provided in the top head of the first liner, and crossflow blades are provided in the plastic insulation layer. The crossflow blades and stirring blades are connected to the motor shaft of the shaded pole motor at the top of the plastic insulation layer at the same time. An opening on one side of the inner cavity of the plastic insulation layer is connected to the exhaust port on one side of the machine body through an exhaust hood.

[0012] The handle on one side of the pot assembly extends out of the opening on one side of the heat-insulating lining of the machine body. Thus, the pot assembly can be put into or taken out of the machine body through the handle on one side, or the pot assembly can be taken out or put into the machine body through the door on the heat-insulating lining on one side of the machine body. In this case, the pot assembly can also be omitted in the machine body, and food can be put into the machine body through the baking tray. The machine body is an air oven.

[0013] The blade structure of the utility model is reasonably designed, easy to manufacture, and has a wide range of applications. In particular, the energy efficiency, wind field, and temperature field are good, which is convenient for improving cooking effects. The utility model is suitable for use as a centrifugal fan blade of similar products and an air fryer thereof, as well as a structural improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a partial structural schematic diagram of the utility model in use state.

[0015] Figure 2 yes Figure 1 Schematic diagram of the internal structure.

[0016] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure of the whole machine in use status.

[0017] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional enlarged structure of the stirring fan blade.

[0018] Figure 5 yes Figure 4 Schematic diagram of the side structure.

[0019] Figure 6 yes Figure 4 Schematic diagram of the bottom three-dimensional structure.

[0020] Figure 7 It is a schematic diagram of the structure of an existing open radial centrifugal impeller.

[0021] Figure 8 The utility model is a schematic diagram of the structure of an existing closed backward curved centrifugal impeller.

[0022] Fig. 9 It is a curve diagram of the wind speed range inside the body of the existing open radial centrifugal impeller in use state.

[0023] Fig.10 It is a wind field distribution spectrum diagram of the grill position inside the machine body when the existing open radial centrifugal impeller is in use.

[0024] Fig.11 It is a curve diagram of the wind speed range inside the machine body when the stirring fan blade of the utility model is in use.

[0025] Fig.12 It is a wind field distribution spectrum diagram of the grill position inside the machine body when the stirring fan blade of the utility model is in use.

[0026] Serial numbers and names of the accompanying drawings: 1. shaded-pole motor, 2. crossflow fan blade, 3. first lining, 4. second lining, 5. third lining, 6. pot body assembly, 601. handle, 602. inner pot, 7. stirring fan blade, 701. blade, 7011. first blade, 7012. second blade, 7013. third blade, 7014. first gap, 7015. second gap, 7016. third gap, 702. shaft hole, 703. stamping groove, 7031. reinforcement protrusion, 8. heating tube, 9. plastic insulation layer. Implementation

[0027] Now, in conjunction with the accompanying drawings, the structure and use of the utility model are further described. Figure 1-Figure 12As shown, the main body of the centrifugal fan blade is a stirring fan blade 7, the stirring fan blade is provided with a blade 701 formed by stamping and bent toward the bottom side, and there are equidistant gaps between the discs between the connected blades, the blades and the discs are formed by stamping and bending at 90 degrees, and an axial hole 702 is provided at the center of the stirring fan blade. The blades of the stirring fan blade include a first blade 7011, a second blade 7012 and a third blade 7013, a first gap 7014 is provided between the first blade and the second blade, a second gap 7015 is provided between the second blade and the third blade, and a third gap 7016 is provided between the connected blades; the first blade, the second blade, and the third blade have the same height and increase in sequence, and the first blade, the second blade, and the third blade have the same width and increase in sequence. Specifically: the outer side of the stirring blade is a triangular protrusion from the third gap side to the connected third gap side, and the corresponding ends of the first blade, the second blade and the third blade are respectively triangular protrusions; at the same time, the third gap and the second gap of the stirring blade are respectively right-angled trapezoids with openings on the outside, and the first gaps are respectively rectangles with openings on the outside, the shape of the first blade corresponds to the shape of the first gap, and the shapes of the second blade and the third blade correspond to the shapes of the second gap and the third gap respectively.

[0028] Furthermore, the heights h of the first blade, the second blade and the third blade of the stirring fan blade are 10 mm; the diameter r of the air inlet at the bottom of the third gap outside the shaft hole of the stirring fan blade is 22 mm. The top of the stirring fan blade is provided with a connected stamping groove 703, and the stamping groove at the blade is provided with a reinforcing protrusion 7031 formed by stamping.

[0029] The stirring fan blade and the heating tube 8 are arranged in the groove at the bottom of the first lining 3. The notch at the bottom of the first lining is aligned with the pot mouth above the inner pot 602 of the pot body assembly 6 in the machine body. The motor shaft at the shaded pole motor at the top of the first lining is connected to the shaft hole of the stirring fan blade through the first lining. The heating tube and the shaded pole motor are connected to the PCB control assembly in the machine head through the line. The first lining is connected to the second lining 4 on the outer diameter of the pot body assembly and the third lining 5 at the bottom of the pot body assembly to form an insulating lining. The pot body assembly is placed in the machine body through an opening on one side of the insulating lining. The first lining is a hardware insulation layer, and the second lining and the third lining are hardware insulation inner walls. Furthermore, a plastic insulation layer 9 is provided in the top head of the first lining, and a crossflow fan blade 2 is provided in the plastic insulation layer. The crossflow fan blade and the stirring fan blade are simultaneously connected to the motor shaft at the shaded pole motor at the top of the plastic insulation layer. The opening on one side of the inner cavity of the plastic insulation layer is connected to the exhaust port on one side of the machine body through an exhaust hood. The handle 601 on one side of the pot body assembly extends out of an opening on one side of the heat insulating lining of the body.

[0030] The centrifugal fan blades reduce the low-speed area in the air fryer from 30% to 17.5%, and the high-speed area increases the wind speed area above 10m / s from 3% to 13%. At the same time, the configuration of blades of different lengths can effectively improve the efficiency of the impeller, making it have a larger air volume and faster wind speed; the 22mm ultra-small air inlet reduces eddy currents; the 10mm ultra-low blade height makes it more versatile.

[0031] When in use, the pot body assembly is taken out through the handle, and after food is put into the inner pot or the grill of the pot body assembly, the pot body assembly is put back into the body through the handle; finally, the corresponding cooking button on the control panel of the PCB control assembly is pressed, and the corresponding food in the pot body assembly can be automatically processed and cooked.

[0032] To sum up, the centrifugal fan blade reduces the height of the blade. Since the current blades are generally quite high, there are great limitations in product design. At the same time, the product performance is improved, that is, the product performance is improved without increasing the product cost, thus bringing better user experience to consumers.

[0033] The above contents are intended to illustrate the technical means of the utility model, but not to limit the technical scope of the utility model. Those skilled in the art can make obvious improvements or substitutions to the utility model in combination with existing common knowledge, which also fall within the protection scope of the claims of the utility model. For example, the first blade, the second blade, and the third blade are provided with two or more blades according to actual conditions, and the rectangular gap is improved to a triangle or a right-angled trapezoid.

Claims

1. A centrifugal fan blade, the main body of which is a stirring fan blade (7), the stirring fan blade is provided with a blade (701) formed by stamping and bent toward the bottom side, and there are gaps arranged equidistantly between the discs between the connected blades, the blades and the discs are stamped and bent at 90 degrees, and an axial hole (702) is provided at the center of the stirring fan blade; characterized in that The blade (701) of the stirring impeller (7) is provided with at least two sub-blades of different sizes and the same height, and gaps of the same width and different areas are provided between the sub-blades; the sub-blades of the blade include a first blade (7011), a second blade (7012) and a third blade (7013); a first gap (7014) is provided between the first blade and the second blade, a second gap (7015) is provided between the second blade and the third blade, and a third gap (7016) is provided between connected blades; the first blade, the second blade and the third blade have the same height and increase in sequence, and the first gap, the second gap and the third gap formed by stamping corresponding to the first blade, the second blade and the third blade have the same width and increase in sequence.

2. The centrifugal fan blade according to claim 1, characterized in that The outer side of the blade (701) of the stirring fan blade (7) is triangularly protruded from the side of the third gap (7016) to the side of the third gap connected thereto, and the corresponding ends of the first blade (7011), the second blade (7012) and the third blade (7013) are respectively triangularly protruded.

3. The centrifugal fan blade according to claim 2, characterized in that The third gap (7016) and the second gap (7015) of the blade (701) of the stirring impeller (7) are respectively in the form of a right-angled trapezoid with an outer opening, and the first gap (7014) is respectively in the form of a rectangle with an outer opening. The shape of the first blade (7011) corresponds to the shape of the first gap, and the shapes of the second blade (7012) and the third blade (7013) correspond to the shapes of the second gap and the third gap, respectively.

4. The centrifugal fan blade according to claim 3, characterized in that The height h of the first blade (7011), the second blade (7012) and the third blade (7013) at the blade (701) of the stirring fan blade (7) is 10 mm.

5. The centrifugal fan blade according to claim 4, characterized in that The diameter r of the air inlet at the bottom of the third gap (7016) outside the shaft hole (702) of the stirring fan blade (7) is 22 mm.

6. The centrifugal fan blade according to claim 5, characterized in that A communicating stamping groove (703) is provided at the top of the blade (701) of the stirring fan blade (7), and a reinforcing protrusion (7031) formed by stamping is provided in the stamping groove on the blade.

7. An air fryer using the centrifugal fan blade according to any one of claims 1 to 6, characterized in that The stirring fan blade (7) and the heating tube (8) are arranged in the groove at the bottom of the first lining (3); the notch at the bottom of the first lining is aligned with the pot mouth above the inner pot (602) of the pot body assembly (6) in the machine body; the motor shaft at the shaded pole motor (1) at the top of the first lining is connected to the shaft hole (702) of the stirring fan blade through the first lining; the heating tube and the shaded pole motor are connected to the PCB control assembly in the machine head through the line; the first lining is connected to the second lining (4) on the outer diameter of the pot body assembly and the third lining (5) at the bottom of the pot body assembly to form a heat insulating lining; the pot body assembly is placed in the machine body through an opening on one side of the heat insulating lining; the first lining is a metal heat insulating layer, and the second lining and the third lining are metal heat insulating inner walls.

8. The air fryer according to claim 7, characterized in that A plastic insulation layer (9) is provided in the top head of the first liner (3), and a crossflow fan blade (2) is provided in the plastic insulation layer. The crossflow fan blade and the stirring fan blade (7) are simultaneously connected to the motor shaft of the shaded pole motor (1) at the top of the plastic insulation layer, and an opening on one side of the inner cavity of the plastic insulation layer is connected to an exhaust port on one side of the machine body through an exhaust hood.

9. The air fryer according to claim 8, characterized in that The handle (601) on one side of the pot body assembly (6) extends out of an opening on one side of the heat-insulating lining of the pot body.

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