CN218899211U - Air duct structure and air fryer - Google Patents

Abstract

The application provides an air duct structure and an air fryer. The air duct structure is applied to the air fryer and comprises a shell, an impeller and an air outlet grid, wherein the shell is provided with an air outlet. An impeller is rotatably positioned within the housing. The air outlet grating comprises a grating body and a plurality of protruding portions, the grating body is assembled on the shell, the grating body comprises an outer surface and an inner surface, the grating body is provided with a plurality of ventilation holes which are distributed at intervals, the ventilation holes penetrate through the outer surface and the inner surface, the ventilation holes are communicated with the air outlet, the protruding portions are arranged on the inner surface in a protruding mode, the protruding portions are located between two adjacent ventilation holes, then the protruding portions can improve aerodynamic performance, so that drag reduction and noise reduction effects are achieved, and reduction of pneumatic noise is facilitated.

Description

Air duct structure and air fryer

Technical Field

The application relates to the technical field of cooking appliances, in particular to an air duct structure and an air fryer.

Background

The air fryer is a food preparation device for cooking food by utilizing air convection, oil is not required to be added when the food is cooked, and the cooked food has the characteristics of low fat and no oil and is favored by consumers.

However, air fryers can produce loud noise during operation, affecting the product experience.

Disclosure of Invention

The embodiment of the application provides an air duct structure and an air fryer, which are used for improving at least one technical problem.

The embodiments of the present application achieve the above object by the following technical means.

In a first aspect, embodiments of the present application provide an air duct structure, the air duct structure is applied to an air fryer, the air duct structure includes a housing, an impeller and an air outlet grille, and the housing is provided with an air outlet. The impeller is rotatably positioned within the housing. The air outlet grating comprises a grating body and a plurality of protruding portions, the grating body is assembled on the shell, the grating body comprises an outer surface and an inner surface, the grating body is provided with a plurality of ventilation holes which are distributed at intervals, the ventilation holes penetrate through the outer surface and the inner surface, the ventilation holes are communicated with the air outlet, the protruding portions are protruding on the inner surface, and the protruding portions are located between two adjacent ventilation holes.

In some embodiments, two adjacent vents are arranged along a first direction, and a plurality of protrusions are arranged along a second direction between the two adjacent vents, wherein the second direction is perpendicular to the first direction.

In some embodiments, the total length of the plurality of protrusions arranged in the second direction is equal to or greater than the length of at least one vent of the adjacent two vents in the second direction.

In some embodiments, the housing further comprises a housing sidewall, a first outlet sidewall connected to a starting end of the housing sidewall, and a second outlet sidewall connected to a finishing end of the housing sidewall, the housing sidewall defining a receiving space in communication with the air outlet, the impeller rotatably positioned in the receiving space, and a gap between an outer peripheral surface of the impeller and the housing sidewall gradually increasing along the housing sidewall from the starting end to the finishing end.

In some embodiments, the ratio of the minimum gap to the outer diameter of the impeller ranges from 0.03 to 0.12 and the ratio of the maximum gap to the outer diameter of the impeller ranges from 0.15 to 0.3.

In some embodiments, the housing sidewall is helical, the first outlet sidewall is connected to a beginning of the helix, and the second outlet sidewall is connected to an ending of the helix.

In some embodiments, the first outlet sidewall and the second outlet sidewall are spaced apart and together define an air outlet, the air outlet is in communication with the receiving space, and an included angle between the first outlet sidewall and the second outlet sidewall is 0-30 degrees. The connecting line of the starting end and the rotation center of the impeller is a first connecting line, the connecting line of the ending end and the rotation center of the impeller is a second connecting line, the included angle between the first connecting line and the base line passing through the center of the side wall of the shell is 65-90 degrees, and the included angle between the second connecting line and the base line passing through the center of the side wall of the shell is 0-30 degrees.

In some embodiments, the junction of the first outlet sidewall and the housing sidewall forms a volute tongue having a radius to outside diameter ratio of 0.03-0.06.

In some embodiments, the volute tongue has a windward side facing the incoming wind side, and the volute tongue further has a first end and a second end opposite in the axial direction of the impeller, the radius of the volute tongue varying gradually from the first end to the second end. Or the volute tongue is provided with a windward side facing the windward side, the volute tongue is also provided with a first end and a second end which are opposite along the axial direction of the impeller, the section of the volute tongue is arc-shaped, a plurality of windward positions are formed on the windward side, and the distances from the windward positions to the centroid of the volute tongue are different.

In a second aspect, embodiments of the present application further provide an air fryer, the air fryer including a driving device, a support, and an air duct structure in any of the above embodiments, the driving device being disposed on the support, the impeller being mounted on the driving device, the housing being disposed on the support at an end thereof remote from the driving device, the impeller being received in the housing.

In wind channel structure and air fryer that this embodiment provided, impeller rotationally is located in the casing, the grid body of air-out grid assembles in the casing, and the grid body is equipped with a plurality of interval distribution's ventilation hole, and the ventilation hole runs through surface and internal surface, and ventilation hole and the air outlet intercommunication of casing, then the air current that the impeller throwed out can be discharged to external environment through the ventilation hole after flowing out from the air outlet of casing. The plurality of protruding portions are protruding to be located the internal surface, and protruding portion is located between two adjacent ventilation holes, and then protruding portion can improve aerodynamic performance to realize drag reduction and noise reduction's effect, help reducing pneumatic noise.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 illustrates a schematic cross-sectional view of an air fryer provided in an embodiment of the present application.

Fig. 2 shows a schematic structural diagram of an air duct structure provided in an embodiment of the present application.

Fig. 3 shows a schematic cross-sectional view of the housing, the air inlet grille and the air outlet grille of the duct structure of fig. 2.

Fig. 4 shows a schematic structural view of an air outlet grille of the air duct structure of fig. 2.

Fig. 5 shows a simplified schematic of the housing of the air duct structure of fig. 2.

Fig. 6 shows a simplified schematic diagram of a housing of an air duct structure according to another embodiment of the present application.

Fig. 7 shows a simplified schematic of the housing of the duct structure of fig. 2.

Fig. 8 shows a partial schematic structural view of the duct structure of fig. 2.

Fig. 9 shows another schematic cross-sectional view of the housing, the air inlet grille, and the air outlet grille of the duct structure of fig. 2.

Detailed Description

In order to enable those skilled in the art to better understand the present application, the following description will make clear and complete descriptions of the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without undue effort.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

Referring to fig. 1-2, embodiments of the present application provide an air duct structure 100, the air duct structure 100 being used in an air fryer 200. It should be noted that, the air cooking apparatuses such as the air oven and the frying and baking integrated machine that can realize the air cooking function also belong to the air fryer 200, and are not described herein again.

The air fryer 200 comprises a cooking cavity, a heating cavity, a heat dissipation cavity and a driving cavity, wherein the heating cavity is arranged above the cooking cavity, and a heating element and a heating fan are arranged in the heating cavity; the heat dissipation cavity is arranged above the heating cavity, the driving cavity is arranged above the heat dissipation cavity, a driving device such as a motor is arranged in the driving cavity, a heat dissipation fan (such as an impeller mentioned in the application) and a heating fan are connected to a motor driving shaft, the heat dissipation fan is arranged in the heat dissipation cavity, and the heating fan is arranged in the heating cavity; the heating element is electrified to release heat, the motor shaft is electrified to rotate, the heating fan rotates to transfer the heat released by the heating element to the cooking cavity for cooking food, and meanwhile, the heat in the heat dissipation cavity and the heat in the driving cavity are dissipated by the heat dissipation fan, so that the situations that an electric appliance element is overheated and blown, the whole machine is overheated and cannot be used and the like are avoided.

The air duct structure 100 includes a housing 10, an impeller 20, and an air outlet grille 40, wherein the impeller 20 is located in the housing 10, and the air outlet grille 40 is disposed in the housing 10.

Housing 10 may be provided as a housing for air fryer 200 or may be provided as a part of the housing. For example, housing 10 may be configured as part of a housing cover for air fryer 200, which may be configured as a top cover for air fryer 200 or as a bottom cover for air fryer 200. In other embodiments, housing 10 may also serve as other structures for air fryer 200.

The housing 10 is provided with an air outlet 14 and the impeller 20 is rotatably located within the housing 10. The impeller 20 may serve as a heat dissipation impeller, and the impeller 20 may dissipate heat from the heat generating components of the air fryer 200, so that the heat generated by the heat generating components may be discharged to the external environment through the air outlet 14 of the housing 10.

Referring to fig. 3 to 4, the air outlet grille 40 includes a grille body 41 and a plurality of protrusions 42, and the plurality of protrusions 42 are connected to the grille body 41.

The grill body 41 is provided to the housing 10. The grill body 41 includes an outer surface 411 and an inner surface 412, and the outer surface 411 and the inner surface 412 may be disposed opposite to each other. With air fryer 200 in normal placement use, outer surface 411 of grill body 41 may face outwardly of air fryer 200 and inner surface 412 may face inwardly of air fryer 200, e.g., inner surface 412 may face air outlet 14.

The grill body 41 is provided with a vent hole 413, the vent hole 413 penetrates through the outer surface 411 and the inner surface 412, and the vent hole 413 is communicated with the air outlet 14, so that air flow can be discharged to the external environment through the vent hole 413 after flowing out from the air outlet 14 of the housing 10.

The number of the ventilation holes 413 is plural, the plural ventilation holes 413 are distributed at intervals, and the plural ventilation holes 413 contribute to an increase in the exhaust air volume of the air duct structure 100. Wherein the plurality of ventilation holes 413 may be the same, partially the same, or completely different in size, shape, etc.

The grille body 41 helps to improve the structural strength of the housing 10 around the air outlet 14, and also helps to prevent objects with larger volume from falling into the impeller 20 from the air outlet 14 to affect the operation of the impeller 20, thereby helping to improve the safety of the air duct structure 100.

A plurality of protrusions 42 are protruded from the inner surface 412, and the protrusions 42 are located between two adjacent ventilation holes 413. The projections 42 may be a biomimetic, non-smooth surface structure, for example, the projections 42 may be saw tooth-like structures or other structures.

The bosses 42 can enhance aerodynamic performance to achieve drag reduction and noise reduction effects, which helps reduce aerodynamic noise. For example, the protrusion 42 can divide the air flow of the air outlet 14 into a plurality of branched air flows in the spanwise direction, and the branched air flows are formed by two eddies with opposite rotation directions and gradually merge in the flow direction, so that the air flow is not easy to form a large vortex trend in the whole spanwise direction, thereby reducing the flow loss and improving the flow efficiency. For example, the protrusion 42 also has a noise suppressing effect, and the protrusion 42 can attenuate or even completely suppress the boundary layer unstable noise, and reduce the noise value.

The plurality of ventilation holes 413 may be arranged in a row, a column, etc. Among all the ventilation holes 413, a plurality of protruding portions 42 may be provided between any adjacent two of the ventilation holes 413; alternatively, among all the ventilation holes 413, a plurality of protrusions 42 are provided between part of the adjacent two ventilation holes 413, and no protrusion 42 may be provided between part of the adjacent two ventilation holes 413.

The adjacent two ventilation holes 413 may be arranged along the first direction D1, and a plurality of protrusions 42 arranged along the second direction D2 are provided between the adjacent two ventilation holes 413, and the second direction D2 is perpendicular to the first direction D1. In this way, the arrangement of the plurality of protruding portions 42 and the arrangement of the two adjacent ventilation holes 413 are more reasonable, so that the air flow can flow to the ventilation holes 413 after being regulated by the protruding portions 42.

The total length of the plurality of protrusions 42 arranged in the second direction D2 may be equal to the length of at least one vent 413 of the adjacent two vents 413 in the second direction D2, and the total length of the plurality of protrusions 42 arranged in the second direction D2 may be greater than the length of at least one vent 413 of the adjacent two vents 413 in the second direction D2. In this way, it is helpful to ensure that the bosses 42 located near the ventilation holes 413 are able to regulate the flow of the exhaust air as much as possible.

The air outlet grille 40 and the housing 10 may be integrally formed, for example, they may be integrally formed by a mold. The air outlet grille 40 and the casing 10 may have two independent structures, and after being molded, they may be assembled together by interference fit, or may be fixed together by fastening means such as screws, bolts, rivets, or may be fixedly connected by gluing or other means.

Referring to fig. 2 and 5, the housing 10 may include a housing sidewall 11, a first outlet sidewall 12, and a second outlet sidewall 13, with the first outlet sidewall 12 and the second outlet sidewall 13 being connected to the housing sidewall 11.

The housing sidewall 11 has a beginning 111 and an ending 112. The first outlet sidewall 12 is connected to a start end 111 of the housing sidewall 11 and the second outlet sidewall 13 is connected to an end 112 of the housing sidewall 11. The housing sidewall 11 defines an accommodating space 113, the accommodating space 113 communicates with the air outlet 14, and the impeller 20 is rotatably disposed in the accommodating space 113, so that the impeller 20 can suck heat generated by the heat generating components into the accommodating space 113 and discharge the heat through the air outlet 14 and the air outlet grill 40.

The broken line circle in fig. 5 represents the outer peripheral surface of the impeller 20. The gap between the outer peripheral surface of the impeller 20 and the side wall 11 of the housing gradually increases from the start end 111 to the end 112, so that the gap can collect the gas thrown out in the rotation process of the impeller 20, so that the gas flows along the side wall 11 of the housing from the start end 111 to the end 112, and part of dynamic pressure energy of the gas at the impeller 20 can be converted into static pressure energy in the flowing process, so that wind pressure is formed, thereby being beneficial to improving the working efficiency of the impeller 20 and improving the wind quantity.

In the air duct structure 100 provided in this embodiment, after the housing 10 is provided, the wind flowing in the housing 10 includes the wind which is involved in the side wall of the housing 10 in the previous wind cycle besides the wind outside the housing 10 brought by the rotation of the impeller 20, so the total wind volume is increased, and further the heat dissipation efficiency is improved; meanwhile, wind pressure at the outlet is also improved, the wind at the outlet can effectively overcome the resistance provided by other obstacles, good heat dissipation is ensured, and the sound generated when the wind collides with each side wall is reduced. Further, due to the increase of wind pressure and wind quantity, the impeller 20 with smaller outer diameter can be selected to ensure the heat dissipation effect, and due to the smaller outer diameter, the linear speed is also reduced, so that the noise caused by the rotation of the impeller 20 is reduced; meanwhile, due to the fact that the smaller impeller 20 is adopted, a smaller air frying machine head can be adapted, the size is reduced, the material cost is reduced, and the load of a motor is lightened. After the shell 10 is arranged, the impeller 20 is isolated in the shell 10, so that the rotation sound of the impeller 20 can be prevented from being transmitted to the outside of the shell 10, and the noise of the whole machine is further reduced; meanwhile, when the housing 10 is not arranged, the flowing wind can collide with the electronic components or the fixing structures thereof in the heat dissipation cavity to generate vibration, so that noise is generated, and the arrangement of the housing 10 avoids the generation of the noise.

In some embodiments, the spiral-shaped side wall 11 of the housing is helpful for ensuring that the flow channel is approximately smooth, so that the overall flow field is smooth, the gap between the impeller 20 and the side wall 11 of the housing has no redundant mechanical structure, noise generated by the impact of the air flow on the mechanical structure is reduced, meanwhile, kinetic energy lost by the impact of the air flow on the mechanical structure is reduced, and the conversion of the lost energy into heat energy, acoustic energy and other energy is reduced, so that the air duct structure 100 has the characteristics of good heat dissipation effect and low noise.

The spiral shape of the housing side wall 11 may be an archimedes spiral shape or a logarithmic spiral shape. Thus, the smoothness of the flow field formed by the housing side wall 11 is further improved.

The ratio of the minimum gap to the outer diameter of the impeller 20 may be 0.03 to 0.12 and the ratio of the maximum gap to the outer diameter of the impeller 20 may be 0.15 to 0.3 among the gaps between the housing sidewall 11 and the outer circumferential surface of the impeller 20.

The minimum gap may be a gap between the start end 111 of the spiral shape and the outer circumferential surface of the impeller 20. The ratio of the minimum clearance to the outer diameter of the impeller 20 may be 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, or any value between the two adjacent values.

The maximum gap may be a gap between the spiral-shaped ending end 112 and the outer circumferential surface of the impeller 20. The ratio of the maximum clearance to the outer diameter of the impeller 20 may be 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3 or any value between adjacent ones of the above.

In this way, the ratio of the minimum gap, the maximum gap, etc. to the outer diameter of the impeller 20 is within the above reasonable range, which is conducive to the impeller 20 generating higher air volume at the same rotation speed, so that the rotation speed of the impeller 20 can be reduced under the condition of ensuring the air volume, and simultaneously, the air duct structure 100 is conducive to reducing the aerodynamic noise, and is conducive to the effects of both large air volume and low noise.

The direction of rotation of the impeller 20 may be generally along the housing sidewall 11 from the start end 111 to the end 112.

The first outlet sidewall 12 and the second outlet sidewall 13 may be disposed at intervals, the first outlet sidewall 12 and the second outlet sidewall 13 may together define an air outlet 14, the air outlet 14 is communicated with the accommodating space 113, and then the gas in the accommodating space 113 may be discharged through the air outlet 14.

In some embodiments, a centerline 101 is formed between the first outlet sidewall 12 and the second outlet sidewall 13, and rays of the centerline 101 directed toward the impeller 20 do not pass through the center of the impeller 20. For example, as shown in fig. 6, the center line 101 is separated from the outer peripheral surface of the impeller 20; as shown in fig. 7, the center line 101 is tangential to the outer peripheral surface of the impeller 20. Thus, the wind pressure at the outlet is also improved, good heat dissipation is ensured, pneumatic noise is reduced, and the air duct structure 100 has the effects of large air quantity and low noise.

In some embodiments, referring to fig. 5, the first outlet sidewall 12 and the second outlet sidewall 13 may each be linear, and the angle between the first outlet sidewall 12 and the second outlet sidewall 13 may be between 0 and 30 degrees. For example, α may be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 or any value between two adjacent values.

The α is within the reasonable range, and in the case that α is 0 degrees, the first outlet sidewall 12 and the second outlet sidewall 13 can better guide the gas thrown out by the impeller 20 to be discharged out of the air duct structure 100 from the air outlet 14. Under the condition that alpha is greater than 0 degree, the air outlet 14 can reduce the flow speed of the air flow, so that part of kinetic energy of the air flow is converted into static pressure energy, the flow loss of an outlet is reduced, noise is reduced, the static pressure efficiency is improved, meanwhile, the air pressure can be increased, the resistance of the air flow is improved, and the air flow flowing process is not easy to attenuate.

The starting end 111 and the ending end 112 of the housing sidewall 11 may be cooperatively designed to increase the working efficiency of the impeller 20.

The line connecting the start end 111 of the housing sidewall 11 and the rotation center of the impeller 20 is a first line, and the angle between the first line and a base line passing through the center of the housing sidewall 11 is β, which may be 65 to 90 degrees. For example, the first connection may have an included angle β from the baseline of 65 degrees, 66 degrees, 67 degrees, 68 degrees, 69 degrees, 70 degrees, 71 degrees, 72 degrees, 73 degrees, 74 degrees, 75 degrees, 76 degrees, 77 degrees, 78 degrees, 79 degrees, 80 degrees, 81 degrees, 82 degrees, 83 degrees, 84 degrees, 85 degrees, 86 degrees, 87 degrees, 88 degrees, 89 degrees, 90 degrees, or any value between two adjacent values.

The line connecting the end 112 of the housing sidewall 11 and the center of rotation of the impeller 20 is a second line, and the angle θ between the second line and a base line passing through the center of the housing sidewall 11 may be 0 to 30 degrees. For example, the second connection may have an included angle θ from the baseline of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 or any value between the two adjacent values.

In this way, the forms of the side wall 11 of the shell are matched with the impeller 20 within the reasonable range, so that the air quantity is further improved, the pneumatic noise is reduced, and the work efficiency of the impeller 20 is further improved.

Referring to fig. 2 and 8, the casing 10 may further include a volute tongue 15, for example, a connection between the casing side wall 11 and the first outlet side wall 12 may form the volute tongue 15, where the volute tongue 15 has a windward side 153 facing the incoming wind side, and the windward side 153 may play a role in splitting, and in the case that the airflow impacts the volute tongue 15, the windward side 153 may enable a part of the airflow to flow along the air outlet 14, and a part of the airflow returns to the accommodating space 113 from a gap between the volute tongue 15 and the impeller 20, so as to help improve the air volume and noise.

The minimum clearance between the casing side wall 11 and the outer peripheral surface of the impeller 20 may be approximately the minimum clearance between the volute tongue 15 and the outer peripheral surface of the impeller 20.

The volute tongue 15 has a first end 151 and a second end 152, the first end 151 and the second end 152 being opposite ends of the volute tongue 15, e.g., the first end 151 and the second end 152 may be opposite in the axial direction x of the impeller 20.

The radius of the volute tongue 15 at the first end 151 may be different than the radius at the second end 152.

In some embodiments, the radius of the volute tongue 15 may change gradually from the first end 151 to the second end 152. In this way, when the windward side 153 is uneven, the impact of wind does not occur at the same time, so that the airflow does not impact the volute tongue 15 at the same time, thus phase difference exists, the blade frequency noise is reduced, and the noise can be effectively reduced.

In some embodiments, the cross section of the volute tongue 15 is arc-shaped, the windward side 153 is formed with a plurality of windward positions, and distances from the windward positions to the centroid of the volute tongue 15 are different, so that the wind impact does not occur simultaneously, and noise can be effectively reduced.

In some embodiments, windward side 153 is sloped along first end 151 to second end 152, e.g., windward side 153 may be sloped in the direction of the incoming wind side or in the direction of the leeward side. The inclined surface helps to ensure that the windward side 153 is not flat, so that the impact of wind does not occur simultaneously, and noise can be effectively reduced.

In some embodiments, at least one protrusion is provided on the windward side 153, and the protrusion helps to ensure that the windward side 153 is not flat, so that the wind impact does not occur simultaneously, and noise can be effectively reduced. The number of the protrusions may be plural, for example, the number of the protrusions may be two, three, four, five or other numbers, and the protrusions may be spaced along the direction from the first end 151 to the second end 152, so that the protrusions may contribute to the noise reduction effect.

In some embodiments, the windward side 153 has at least one groove, which helps to ensure that the windward side 153 is not flat, so that the wind impact does not occur simultaneously, and noise can be effectively reduced. The number of grooves may be plural, for example, the number of grooves may be two, three, four, five or other, and the plural grooves may be spaced along the direction from the first end 151 to the second end 152, so that the plural grooves contribute to the noise reduction effect.

The direction of the volute tongue 15 from the first end 151 to the second end 152 may be substantially the height direction of the volute tongue 15, may be substantially the height direction of the housing sidewall 11, or may be substantially the height direction of the first outlet sidewall 12.

The first end 151 of the volute tongue 15 may be attached to other structures of the housing 10. For example, the housing 10 may further include a housing base 16, the housing sidewall 11 may be connected to the housing base 16, the first end 151 of the volute tongue 15 may be connected to the housing base 16, and the second end 152 may be located on a side of the volute tongue 15 facing away from the housing base 16. The direction of the volute tongue 15 from the first end 151 to the second end 152 may also be substantially the thickness direction of the housing base 16.

In addition, the first outlet sidewall 12, the second outlet sidewall 13, etc. may be connected to the housing base plate 16, and the housing sidewall 11, the first outlet sidewall 12, the second outlet sidewall 13, etc. may be connected to the same side of the housing base plate 16.

The radius of the volute tongue 15 may gradually become larger from the first end 151 to the second end 152, so that the radius of the volute tongue 15 at the first end 151 is smaller, and the radius of the volute tongue 15 at the second end 152 is larger, so that the inner surface 412 of the volute tongue 15 is inclined from the inside of the casing 10 to the outside of the casing 10, and in the process of manufacturing and forming the casing 10 through a die, the volute tongue 15 is convenient to demould, which is helpful for simplifying the manufacturing difficulty of the casing 10.

In some embodiments, the ratio of the radius of the volute tongue 15 to the outer diameter of the impeller 20 may be between 0.03 and 0.06. For example, the ratio of the radius of the volute tongue 15 to the outer diameter of the impeller 20 may be 0.03, 0.035, 0.04, 0.045, 0.05, 0.055, 0.06 or any value therebetween. In this way, the volute tongue 15 can better split the airflow, which is helpful to improve aerodynamic performance, so that the air duct structure 100 has good air volume and low noise effect.

In addition, the housing sidewall 11, the first outlet sidewall 12, the second outlet sidewall 13, etc. may be connected to the housing base plate 16, and the housing sidewall 11, the first outlet sidewall 12, the second outlet sidewall 13, etc. may be connected to the same side of the housing base plate 16.

Referring to fig. 2, 3 and 9, the housing 10 may be provided with an air inlet hole 17, the air inlet hole 17 may be communicated with the accommodating space 113, and the air inlet hole 17 is opposite to the impeller 20, so that heat generated by the heat generating components of the air fryer 200 may enter the housing 10 through the air inlet hole 17 under the rotation of the impeller 20. The air inlet 17 may be provided in the housing base 16.

The air duct structure 100 may further include an air inlet grill 30, and the air inlet grill 30 may be disposed on the housing 10, for example, the air inlet grill 30 may be disposed on the housing base 16.

The air inlet grill 30 may be located at the air inlet hole 17. The air inlet grill 30 may include the grill 31, and the grill 31 may have a generally elongated plate-like structure or other structure. The number of the grid bars 31 may be plural, the plurality of grid bars 31 may be distributed at intervals around the center of the air inlet hole 17, and the length direction of the grid bars 31 is perpendicular to the axial direction x of the impeller 20, so that the plurality of grid bars 31 may be distributed substantially radially with respect to the center of the air inlet hole 17, and then air may enter the casing 10 through the interval spaces between the grid bars 31.

The grid 31 helps to improve the structural strength of the housing 10 at the air inlet 17, and also helps to prevent objects with larger volume from falling into the impeller 20 from the air inlet 17 to affect the operation of the impeller 20, thereby improving the safety of the air duct structure 100.

In this application, the term "plurality" may refer to greater than or equal to two, for example, the number of bars 31 may be two, three, five, ten, fifteen, twenty, etc. In the embodiment of fig. 4, the number of bars 31 is nineteen.

The grate bars 31 may be arranged obliquely with respect to the axis 171 of the air inlet openings 17, i.e. the width direction of the grate bars 31 is not perpendicular to the axial direction x of the impeller 20, but at an angle to the axial direction x of the impeller 20. The grid 31 has first and second sides opposite in the width direction, the first side being forward of the second side in the rotation direction of the impeller 20, the first sides of the plurality of grid 31 being inclined toward the same side in the rotation direction of the impeller 20, and the inclination direction of the plurality of grid 31 may be the same as the rotation direction of the impeller 20. For example, when the impeller 20 rotates in the clockwise direction z, the inclination direction of the grid 31 is clockwise z, so that the air inlet direction of the air inlet flow is in line with the rotation direction of the impeller 20, the grid 31 can rectify the air, guide the air to flow circularly more rapidly, and help to reduce the air inlet resistance, so that the air quantity is improved at the same rotation speed of the impeller 20, and the rotation speed of the impeller 20 can be reduced under the same air quantity, thereby helping to reduce the aerodynamic noise and enhancing the heat dissipation effect.

The rotation direction of the impeller 20 may be substantially a direction along the housing sidewall 11 from the start end 111 to the end 112.

The air inlet grille 30 may further include an annular frame 32, and the annular frame 32 may be annular or have other shapes. The grid 31 may be connected to the inner ring of the annular frame 32.

The annular frame 32 may be provided to the housing 10, for example, the annular frame 32 may be provided to the housing base plate 16. The annular frame 32 may be located in the air inlet 17.

The annular frame 32 may be gradually reduced from the air inlet grille 30 toward the impeller 20, so that the air flow is accelerated at the inner ring of the annular frame 32, and a uniform velocity field and pressure field are established before the air flow enters the impeller 20, thereby helping to reduce the flow loss of the air flow and improving the work efficiency of the impeller 20.

The annular frame 32 may be partially protruded in the accommodating space 113, and the projection of the annular frame 32 along the axial direction of the impeller 20 is smaller than the outer diameter of the impeller 20. In this way, the annular frame 32 can block the air flow from flowing back, for example, the air flow in the gap between the side wall 11 of the housing and the outer peripheral surface of the impeller 20 is blocked from flowing back to the impeller 20, and the air flow is blocked from flowing to the outside of the housing 10 through the spacing space between the grid bars 31, so that the work efficiency of the impeller 20 is reduced.

The air inlet grille 30 and the housing 10 may be integrally formed, for example, they may be integrally formed by a mold. The air inlet grille 30 and the shell 10 can also be two independent structures, and the two can be assembled into a whole through interference fit after being molded respectively, can be fixed into a whole through fasteners such as screws, bolts and rivets, and can be fixedly connected through gluing or other modes.

In the case that the air inlet grill 30 and the housing 10 are integrally formed, the interval space between the grill bars 31 may be used as the air inlet hole 17 of the housing 10.

Referring to fig. 2, the air duct structure 100 may further include an air guiding member 50, where the air guiding member 50 may be located between the first outlet sidewall 12 and the second outlet sidewall 13, and the air guiding member 50 is spaced apart from the first outlet sidewall 12 and the second outlet sidewall 13, respectively. Since the impeller 20 mainly throws the air flow out by centrifugal force, the air flow can flow out along one side of the air duct and concentrate the air flow on one side of the air duct, and the air guide 50 can separate the air flow, which helps to make the air flow more uniform.

Wherein the air guide 50 may be connected to the housing base plate 16. The air guide 50 may have a substantially elongated structure or other structures, and the air guide 50 may extend along the length direction of the air outlet 14.

The number of the air guide members 50 may be plural, and the air guide members 50 may be arranged at intervals. For example, the number of wind guides 50 may be two, three, four, five, or other numbers.

The air guide 50 and the housing 10 may be integrally formed, for example, they may be integrally formed by a mold. The air guide 50 and the casing 10 may have two independent structures, and after being molded, they may be assembled together by interference fit, or may be fixed together by fastening means such as screws, bolts, rivets, or may be fixedly connected by gluing or other means.

Referring to fig. 1, embodiments of the present application also provide an air fryer 200, where the air fryer 200 may include a drive device 300, a stand 301, and the tunnel structure 100 of any of the embodiments described above.

The driving device 300 is arranged on the holder 301 so that the holder 301 carries the driving device 300. Wherein the driving means 300 may be a driving motor.

The impeller 20 is mounted to the driving device 300 so that the driving device 300 can drive the impeller 20 to rotate.

The housing 10 is disposed at an end of the stand 301 remote from the driving device 300, and the impeller 20 is accommodated in the housing 10. Thus, the housing 10 is integrated on the bracket 301 for carrying the driving device 300, so that the overall height can be effectively reduced, the material can be saved, and the cost can be reduced.

In the air duct structure 100 and the air fryer 200 provided in this embodiment, the impeller 20 is rotatably located in the casing 10, the grille body 41 of the air outlet grille 40 is assembled in the casing 10, the grille body 41 is provided with a plurality of ventilation holes 413 distributed at intervals, the ventilation holes 413 penetrate through the outer surface 411 and the inner surface 412, the ventilation holes 413 are communicated with the air outlet 14 of the casing 40, and then the air flow thrown out by the impeller 20 can be discharged to the external environment through the ventilation holes 413 after flowing out from the air outlet 14 of the casing 10. The plurality of protruding portions 42 are protruding from the inner surface 412, and the protruding portions 42 are located between two adjacent ventilation holes 413, so that the protruding portions 42 can improve aerodynamic performance, achieve drag reduction and noise reduction effects, and contribute to reduction of aerodynamic noise.

In this application, the terms "mounted," "connected," and the like are to be construed broadly unless otherwise specifically indicated or defined. For example, the connection can be fixed connection, detachable connection or integral connection; may be a mechanical connection; the connection may be direct, indirect, or internal, or may be surface contact only, or may be surface contact via an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as a specific or particular structure. The description of the term "some embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this application, the schematic representations of the above terms are not necessarily for the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described herein, as well as features of various embodiments or examples, may be combined and combined by those skilled in the art without conflict.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and are intended to be included within the scope of the present application.

Claims (10)

1. An air duct structure for use with an air fryer, the air duct structure comprising:

a shell provided with an air outlet;

an impeller rotatably positioned within the housing; and

the air outlet grille comprises a grille body and a plurality of protruding portions, wherein the grille body is arranged on the shell and comprises an outer surface and an inner surface, a plurality of ventilation holes which are distributed at intervals are formed in the grille body, the ventilation holes penetrate through the outer surface and the inner surface, the ventilation holes are communicated with the air outlet, the protruding portions are protruding on the inner surface, and the protruding portions are located between two adjacent ventilation holes.

2. The duct structure of claim 1, wherein two adjacent ones of the ventilation holes are arranged in a first direction, and a plurality of the protrusions are arranged in a second direction between two adjacent ones of the ventilation holes, the second direction being perpendicular to the first direction.

3. The air duct structure according to claim 2, wherein a total length of the plurality of protruding portions arranged in the second direction is equal to or greater than a length of at least one of the two adjacent ventilation holes in the second direction.

4. The duct structure of claim 1, wherein the housing further comprises a housing sidewall, a first outlet sidewall and a second outlet sidewall, the first outlet sidewall being connected to a start end of the housing sidewall, the second outlet sidewall being connected to an end of the housing sidewall, the housing sidewall defining a receiving space, the receiving space being in communication with the air outlet, the impeller being rotatably positioned in the receiving space, a gap between an outer peripheral surface of the impeller and the housing sidewall increasing along the housing sidewall from the start end to the end.

5. The duct structure of claim 4, wherein the ratio of the minimum gap to the outer diameter of the impeller is in the range of 0.03-0.12 and the ratio of the maximum gap to the outer diameter of the impeller is in the range of 0.15-0.3.

6. The duct structure of claim 4, wherein the housing sidewall is spiral, the first outlet sidewall is connected to a start end of the spiral, and the second outlet sidewall is connected to an end of the spiral.

7. The duct structure of claim 4, wherein the first outlet sidewall is spaced from the second outlet sidewall and collectively defines an air outlet, the air outlet being in communication with the receiving space, the first outlet sidewall and the second outlet sidewall having an included angle of 0-30 degrees;

the connecting line of the starting end and the rotation center of the impeller is a first connecting line, the connecting line of the ending end and the rotation center of the impeller is a second connecting line, the included angle between the first connecting line and a base line passing through the center of the side wall of the shell is 65-90 degrees, and the included angle between the second connecting line and the base line passing through the center of the side wall of the shell is 0-30 degrees.

8. The air duct structure of claim 4, wherein a volute tongue is formed at a junction of the first outlet sidewall and the housing sidewall, and wherein a ratio of a radius of the volute tongue to an outer diameter of the impeller is 0.03-0.06.

9. The air duct structure of claim 8, wherein the volute tongue has a windward side facing the incoming wind side, the volute tongue further having first and second ends opposite in the axial direction of the impeller, the volute tongue having a radius that varies gradually from the first end to the second end;

or the volute tongue is provided with a windward side facing the windward side, the volute tongue is also provided with a first end and a second end which are opposite along the axial direction of the impeller, the section of the volute tongue is arc-shaped, the windward side is provided with a plurality of windward positions, and the distances from the windward positions to the centroid of the volute tongue are different.

10. An air fryer comprising:

a driving device;

the driving device is arranged on the bracket; and

the air duct structure according to any one of claims 1 to 9, wherein the impeller is mounted to the driving device, the housing is provided at an end of the bracket remote from the driving device, and the impeller is accommodated in the housing.

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