CN213882915U

CN213882915U - Air guide assembly and cooking utensil with same

Info

Publication number: CN213882915U
Application number: CN202022685534.6U
Authority: CN
Inventors: 马强; 史庭飞
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-08-06
Anticipated expiration: 2030-11-18

Abstract

The utility model provides an air guide assembly and have its cooking utensil, include: the air guide piece is provided with an air inlet and an air outlet; the fan is arranged in the air guide piece; the heating structure is arranged above the air outlet; wherein, the air guide has circulation pipeline section and the convergent section that the intercommunication set up, and the air intake is located the circulation pipeline section and keeps away from the one end of convergent section, and the air outlet is located the one end that the convergent section kept away from the circulation pipeline section, and the flow area of convergent section reduces along the direction of air intake to air outlet gradually. Through the technical scheme provided by the utility model, can solve the relatively poor technical problem of cooking utensil's among the prior art culinary art effect.

Description

Air guide assembly and cooking utensil with same

Technical Field

The utility model relates to a small household appliances technical field particularly, relates to an air guide component and have its cooking utensil.

Background

At present, for the air fryer with side air inlet, the fan used is an axial flow fan or a centrifugal fan, and the distance from the fan to the bottom of the fryer to be heated is long, so that the air pressure of hot air is small. Thus, the upper layer of the cooked food is easily burnt and the bottom layer is still half-cooked, which affects the cooking effect.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides an air guide component and have its cooking utensil to solve the relatively poor technical problem of cooking utensil's among the prior art culinary art effect.

In order to achieve the above object, according to an aspect of the present invention, there is provided an air guide assembly, including: the air guide piece is provided with an air inlet and an air outlet; the fan is arranged in the air guide piece; the heating structure is arranged above the air outlet; wherein, the air guide has circulation pipeline section and the convergent section that the intercommunication set up, and the air intake is located the circulation pipeline section and keeps away from the one end of convergent section, and the air outlet is located the one end that the convergent section kept away from the circulation pipeline section, and the flow area of convergent section reduces along the direction of air intake to air outlet gradually.

Use the technical scheme provided by the utility model, under the effect of fan, the air flows to the direction of air outlet from the air intake, the air is when through making the convergent section, because the flow area of convergent section reduces along the direction of air intake to air outlet gradually, thus, can increase the air outlet pressure of air outlet department, so that increase hot-blast wind pressure, thereby be convenient for make hot-blast bottom to the pot body better, so that cook the bottom of food better, thereby cooking utensil's culinary art effect has been improved. Therefore, through the wind guide assembly that this embodiment provided, can solve the relatively poor technical problem of cooking utensil's among the prior art culinary art effect.

Furthermore, the flow area of the air inlet is larger than that of the air outlet, so that the air outlet pressure at the air outlet is improved better.

Furthermore, the flow-through pipe section is of a uniform cross-section structure. By adopting the structure, the structure is simple, the production and the manufacture are convenient to realize, and the wind guide is also convenient to be carried out through the circulation pipe section.

Further, the air outlet is a rectangular opening. Above-mentioned structure can be convenient for make the shape of air outlet and the shape looks adaptation of heating portion of heating structure to go out hot-blast, improve the air-out effect better.

Furthermore, one end of the tapered section, which is close to the flow-through pipe section, is a communication port, and the communication port is a circular port. The structure can be convenient for the communicating opening to be matched with the circulating pipe section, so that the air in the circulating pipe section smoothly flows into the reducing section through the communicating opening.

Furthermore, the diameter of the communicating opening is d, the air outlet is a rectangular opening, the width of the air outlet is b, and d/b is more than or equal to 2.5 and less than or equal to 3.5. When the value of d/b is too small, specific when the value of d/b is less than 2.5, can make the width of air outlet and the diameter difference of intercommunication mouth not big, the convergent degree of convergent section is comparatively gentle, is unfavorable for effectively improving the wind pressure of air outlet department. When the value of d/b is too large, specifically when the value of d/b is greater than 3.5, although the air pressure of the air outlet is improved, the air outlet area of the air outlet is greatly reduced, and the air at the air outlet cannot cover the heating part inside the heating structure, so that the heating effect is not improved. And through setting up the value of d/b in above-mentioned within range, can enough effectively guarantee the wind pressure, also can effectively guarantee the air-out area.

Further, the flow-through pipe section has a length H₁The length of the tapered section is H₂Wherein, 2 is less than or equal to H₁/H₂Less than or equal to 3. When H is present₁/H₂When the ratio of (A) to (B) is too small, in particular when H₁/H₂When the ratio of (a) to (b) is less than 2, the length of the flow pipe section is too small to facilitate the guiding function of the flow pipe section to wind. When H is present₁/H_{2 of}When the ratio is too large, it is specifically H₁/H₂When the ratio of (2) is more than 3, the length of the flow pipe section is too long, the flow time of the wind in the flow pipe section is prolonged, and the heating efficiency is not favorably and effectively improved. By mixing H₁/H₂The ratio is set in the range, which is not only beneficial to guiding the wind, but also can effectively improve the heating effect.

Furthermore, the gradual change angle of the gradually reducing section is alpha, and the alpha is more than or equal to 35 degrees and less than or equal to 50 degrees. When gradual change angle alpha is too little, specifically when alpha is less than 35, though be favorable to improving the pressure boost effect, the air-out shape that the angle undersize also can make the air outlet is similar to rectangular shape, is unfavorable for being connected of air outlet and heating structure, is unfavorable for improving the heating effect. When gradual change angle alpha is too big, specifically when alpha is greater than 50, though guaranteed the shape of air outlet, but can make the convergent degree of convergent section less, be unfavorable for effectively increasing the wind pressure of air outlet department, therefore also be unfavorable for improving the heating effect. Through setting gradually change angle alpha in above-mentioned within range, can enough guarantee that the air outlet has reasonable air-out area and shape, can effectively improve the heating effect again.

Further, heating structure includes heating shell and heating member, and the heating member setting is in heating shell, and heating shell sets up the one end of keeping away from the circulation pipeline section at the convergent section, heating shell and convergent section intercommunication. Adopt such structure setting, will flow in to the heating casing after the air is through reducing section pressure boost in, flow out after the heating of the heating member in the heating casing, like this, can guarantee hot-blast wind pressure on the one hand, on the other hand can effectively heat the air, reduces thermal loss.

Further, the heating shell is provided with a heating inlet and a heating outlet, the heating inlet is communicated with the air outlet, the heating outlet is located on the side portion of the heating shell, the heating inlet and the heating outlet are rectangular openings, and the heating element is arranged opposite to the heating outlet. Through all setting up heating import and heating export to the rectangle mouth, can be convenient for heating import and heating export all with the shape looks adaptation of heating member to make the wind energy that gets into through heating import blow to the heating member evenly enough, and make the wind energy after the heating member heating blow to the heating export evenly, so that blow off smoothly hot-blast, thereby be convenient for improve the culinary art effect.

Further, the air guide assembly further comprises a heat insulation frame which is arranged on the outer side of the heating structure, so that heat dissipation of the heating shell is reduced, and heat utilization efficiency is improved.

Further, the wind-guiding subassembly still includes: the separator sets up in the convergent section, and the separator extends to the direction of air outlet along the fan. Above-mentioned structure can be convenient for separate into two at least circulation sections to the convergent section and carry out the vortex with the wind to in the convergent section to make partial circumferential wind flow to the middle part region of convergent section.

According to the utility model discloses an on the other hand provides a cooking utensil, and cooking utensil includes air guide component, and air guide component is the above-mentioned air guide component who provides. The cooking appliance comprises an air fryer or an electric cooker or an electric pressure cooker or a multifunctional heating pot with the functions of baking, cooking and cooking.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram illustrating an air guide assembly according to an embodiment of the present invention;

fig. 2 illustrates a cross-sectional view of a wind guide assembly provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic external structural view of an air guide assembly according to an embodiment of the present invention;

fig. 4 illustrates a top view of a wind guide assembly provided according to an embodiment of the present invention;

fig. 5 is a schematic position diagram of a partition of the air guide assembly according to an embodiment of the present invention;

fig. 6 illustrates a front view of a fan blade provided in accordance with an embodiment of the present invention;

fig. 7 shows a top view of a fan blade provided according to an embodiment of the present invention;

fig. 8 shows a schematic size diagram of the air guide assembly according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. an air guide member; 11. a flow-through section; 12. a tapered section; 13. an air inlet; 14. an air outlet; 20. a fan; 21. a motor; 22. a fan blade; 30. a heating structure; 31. heating the housing; 311. heating the inlet; 312. a heating outlet; 32. a heating member; 33. a wire winding plate; 34. a wire; 35. a heater fixing frame; 40. a separator; 50. a motor fixing frame; 60. a shock pad; 70. flattening the cushion; 80. screening a screen; 90. a heat insulation frame.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 8, a first embodiment of the present invention provides an air guide assembly, which includes an air guide 10, a fan 20 and a heating structure 30, wherein the air guide 10 has a flow pipe section 11 and a tapered section 12 which are arranged in a communicating manner. Fan 20 sets up in circulation pipeline section 11, and fan 20 includes motor 21 and flabellum 22, and motor 21 drives the flabellum 22 and rotates, and motor 21 passes through motor mount 50 to be fixed in circulation pipeline section 11 to improve motor 21's setting stability. The heating structure 30 is disposed in the air guide 10 or at an end of the tapered section 12 away from the flow pipe section 11, so that the air blown out of the air guide 10 is heated by the heating structure 30. Specifically, when the heating structure 30 is disposed at an end of the tapered section 12 away from the flow pipe section 11, the heating structure 30 is located outside the air guide 10, so that the damage of the heat radiation of the heating structure 30 to the air guide 10 can be reduced, and the air guide 10 can be protected. Wherein, the one end that flow tube section 11 kept away from convergent section 12 forms air intake 13, and the one end that flow tube section 11 was kept away from to convergent section 12 forms air outlet 14, and the area of overflowing of convergent section 12 reduces along the direction of air intake 13 to air outlet 14 gradually to form the pressure boost effect, improve the air-out pressure of air outlet 14 department. Specifically, the flow tube 11 in this embodiment is a circular tube or a square tube.

By adopting the air guide assembly provided by the embodiment, the air guide assembly in the embodiment is used in a cooking appliance, and the cooking appliance mainly comprises an air fryer or a cooking appliance with a baking function. Under fan 20's effect, the air flows from air intake 13 to the direction of air outlet 14, the air is when through making convergent section 12, because the area of overflowing of convergent section 12 reduces along the direction of air intake 13 to air outlet 14 gradually, and like this, can increase the air-out pressure of air outlet 14 department, so that increase hot-blast wind pressure, so that make hot-blast bottom to the pot body better, so that cook the bottom of food better, thereby cooking utensil's culinary art effect has been improved. Therefore, through the wind guide assembly that this embodiment provided, can solve the relatively poor technical problem of cooking utensil's among the prior art culinary art effect.

Specifically, the flow area of the air inlet 13 in this embodiment is larger than the flow area of the air outlet 14, so as to better improve the air outlet pressure at the air outlet 14.

In the present embodiment, the flow pipe segment 11 has a uniform cross-sectional structure, i.e., the cross-sections of the flow pipe segment 11 at different heights are the same. By adopting the structure, the structure is simple, the production and the manufacture are convenient to realize, and the wind guide is also convenient to be carried out through the circulation pipe section 11. In addition, the constant cross-sectional structure also has sufficient space to facilitate installation of the fan 20 within the flow tube segment 11. In particular, the cross-section of the flow-through pipe segment 11 in this embodiment may be a circular pipe structure.

In the present embodiment, the air outlet 14 is a rectangular opening. Because the sectional area of the heating portion of heating structure 30 is the bar structure, adopts the air outlet 14 structure of rectangle mouth, is convenient for make the shape of air outlet 14 and the shape looks adaptation of the heating portion of heating structure 30 to go out hot-blast, improve the air-out effect better.

Specifically, the tapered section 12 in this embodiment has a communication port at one end close to the flow-through pipe section 11, and the communication port is a circular port. By adopting the structure, the communicating opening can be matched with the circulating pipe section 11 conveniently, so that the air in the circulating pipe section 11 can flow into the tapered section 12 through the communicating opening smoothly.

In the embodiment, the diameter of the communication port is d, the air outlet is a rectangular port, and the width of the air outlet is b, wherein d/b is more than or equal to 2.5 and less than or equal to 3.5. When the value of d/b is too small, it is specific when the value of d/b is less than 2.5, can make the width of air outlet 14 and the diameter difference of intercommunication mouth not big, and the convergent degree of convergent section is comparatively gentle, is unfavorable for effectively improving the wind pressure of air outlet department. When the value of d/b is too large, specifically when the value of d/b is greater than 3.5, although the air pressure of the air outlet 14 is increased, the air outlet area of the air outlet 14 is greatly reduced, and the air at the air outlet 14 cannot cover the heating part inside the heating structure, thereby being not beneficial to improving the heating effect. And through setting up the value of d/b in above-mentioned within range, can enough effectively guarantee the wind pressure, also can effectively guarantee the air-out area.

Specifically, the flow-through pipe segment 11 in this embodiment has a length H₁The length of the tapered section 12 is H₂Wherein, 2 is less than or equal to H₁/H₂Less than or equal to 3. When H is present₁/H₂When the ratio of (A) to (B) is too small, in particular when H₁/H₂A ratio of less than 2 would result in the flow pipe segments 11 being too short in length to facilitate the guiding action of the flow pipe segments 11 against the wind. When H is present₁/H_{2 of}When the ratio is too large, it is specifically H₁/H₂When the ratio of (2) is more than 3, the length of the flow pipe section 11 is too long, so that the flow time of the wind in the flow pipe section is prolonged, and the heating efficiency is not favorably and effectively improved. By mixing H₁/H₂The ratio is set in the range, which is not only beneficial to guiding the wind, but also can effectively improve the heating effect.

In the embodiment, the gradual change angle of the tapered section 12 is alpha, and alpha is more than or equal to 35 degrees and less than or equal to 50 degrees. When gradual change angle alpha is too little, specifically when alpha is less than 35, though be favorable to improving the pressure boost effect, the angle too little also can make the air-out shape of air outlet 14 be similar to rectangular shape, is unfavorable for being connected of air outlet 14 and heating structure 30, is unfavorable for improving the heating effect. When the gradual change angle α is too large, specifically when α is greater than 50 °, although the shape of the air outlet is ensured, the degree of the taper section 12 is small, which is not beneficial to effectively increasing the air pressure at the air outlet 14, and is also not beneficial to improving the heating effect. Through setting gradually change angle alpha in above-mentioned within range, can enough guarantee that air outlet 14 has reasonable air-out area and shape, can effectively improve the heating effect again.

In the present embodiment, the heating structure 30 includes a heating housing 31 and a heating member 32, the heating member 32 is disposed in the heating housing 31, the heating housing 31 is disposed at an end of the tapered section 12 away from the flow-through pipe section 11, and the heating housing 31 is communicated with the tapered section 12. Adopt such structure setting, will flow in to heating housing 31 after the air is through reducing section 12 pressure boost in, flow out after heating by heating member 32 in the heating housing 31, like this, can guarantee hot-blast wind pressure on the one hand, on the other hand can effectively heat the air, reduces thermal loss. The heating effect of the heating member 32 can be gathered by arranging the heating shell 31, and meanwhile, the condition that the heating member 32 is arranged in the air guide member 10 and the structure of the air guide member 10 is damaged due to overlarge heat radiation is avoided.

Specifically, the heating element 32 in this embodiment is a heating wire, the heating wire is wound on the winding board 33, and the winding board 33 is a bar-shaped board structure. Preferably, the shapes of the heating inlet 311 and the heating outlet 312 are adapted to the shape of the winding plate 33. The heating wire is connected with an external power supply through a wire 34, and the heating wire fixing frame 35 is used for fixing the heating member 32 and the winding plate 33.

Specifically, the heating housing 31 in this embodiment has a heating inlet 311 and a heating outlet 312, the heating inlet 311 is communicated with the air outlet 14, the heating outlet 312 is located at a side portion of the heating housing 31, and both the heating inlet 311 and the heating outlet 312 are rectangular openings. With such a structure, after the air enters the heating shell 31 through the heating inlet 311, the air is heated by the heating element 32 inside the heating shell 31 to form hot air, and the hot air is discharged from the heating outlet 312 at the side of the heating shell 31 and used for heating the food in the pot body. Because the heating member 32 is generally a strip-shaped structure, the heating inlet 311 and the heating outlet 312 are both set to be rectangular openings, so that the heating inlet 311 and the heating outlet 312 can be adapted to the shape of the heating member 32, the wind energy entering through the heating inlet 311 can be uniformly blown to the heating member 32, the wind energy heated by the heating member 32 can be uniformly blown to the heating outlet 312, the smooth blowing of the hot wind can be facilitated, and the cooking effect can be improved.

In order to better improve the hot air outlet effect of the heating outlet 312, the heating element 32 in the present embodiment is disposed opposite to the heating outlet 312. By adopting the structure, the wind energy heated by the heating element 32 can be smoothly discharged from the heating outlet 312, the dissipation of heat is avoided, and the cooking effect on food is ensured. It should be noted that "the heating member 32 is disposed opposite to the heating outlet 312" in this embodiment may refer to "the heating member 32 is disposed entirely opposite to the heating outlet 312", or refer to "a part of the heating member 32 is disposed opposite to the heating outlet 312".

In the present embodiment, the air guide assembly further includes a heat insulation frame 90, the heat insulation frame 90 is made of a heat insulation material, and the heat insulation frame 90 is disposed outside the heating structure 30, and preferably, the heat insulation frame 90 in the present embodiment is disposed outside the heating casing 31. With such a structural arrangement, the heat dissipation of the heating case 31 can be reduced by the heat insulating frame 90, and the heat use efficiency can be improved.

Specifically, the air guide assembly in this embodiment further includes a partition 40, the partition 40 is disposed in the tapered section 12, and the partition 40 extends along the fan 20 toward the air outlet 14. Since the fan 20 in this embodiment is mainly an axial flow fan 20, the characteristics of the axial flow fan 20 cause the air in the air guide 10 to be blown out along the circumferential direction of the air guide 10, and the air volume in the middle of the air guide 10 is extremely small. By providing the partition 40, the wind at the tapered section 12 can be disturbed. Specifically, the setting of separator 40 in convergent section 12 means that separator 40 is connected with the inner wall of convergent section 12 and separates into two at least circulation sections through separator 40 with air outlet 14, under axial fan 20's effect for the wind in each circulation section all flows along this circulation section's circumference, thereby can improve the amount of wind of air outlet 14 middle part region department, has also improved the homogeneity of air-out to a certain extent. Specifically, the partition 40 may extend in the length direction of the rectangular outlet 14, or the partition 40 may extend in the width direction of the rectangular outlet 14.

The air guide assembly in the embodiment further comprises a shock absorption pad 60, a flat pad 70 and a screen 80, wherein the shock absorption pad 60 and the flat pad 70 are both arranged at the motor fixing frame 50, the shock absorption pad 60 can effectively play a shock absorption role, the influence of the movement of the fan 20 on the air guide member 10 is reduced, and the setting stability of the air guide barrel is improved. The screen 80 is disposed at the heating outlet 312 to improve the uniformity of the outlet air.

An embodiment of the utility model provides a cooking utensil, this cooking utensil includes air guide component, and air guide component is the air guide component who provides in the embodiment one. The cooking appliance comprises an air fryer or an electric cooker or an electric pressure cooker or a multifunctional heating pot with the functions of baking, cooking and cooking.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the air pressure of the air outlet is improved, hot air can smoothly enter the bottom of the pot body, the upper layer and the lower layer of food can be heated, the defect that the food is clamped at the bottom of the pot is overcome, and the cooking effect is improved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An air guide assembly, comprising:

the air guide piece (10), the air guide piece (10) is provided with an air inlet (13) and an air outlet (14);

a fan (20) disposed in the air guide (10);

a heating structure (30) arranged above the air outlet (14);

the air guide piece (10) is provided with a flow pipe section (11) and a reducing section (12) which are communicated, the air inlet (13) is located at one end, far away from the reducing section (12), of the flow pipe section (11), the air outlet (14) is located at one end, far away from the flow pipe section (11), of the reducing section (12), and the flow area of the reducing section (12) is gradually reduced along the direction from the air inlet (13) to the air outlet (14).

2. The air guide assembly as recited in claim 1, characterized in that the air inlet opening (13) has a larger flow area than the air outlet opening (14).

3. Air guide assembly according to claim 1, characterized in that the flow-through duct section (11) is of uniform cross-sectional structure.

4. The air guide assembly according to claim 1, wherein the air outlet (14) is a rectangular opening.

5. The air guiding assembly as recited in claim 1, characterized in that one end of the tapered section (12) close to the flow pipe section (11) is a communication port, and the communication port is a circular port.

6. The air guide assembly as claimed in claim 5, wherein the diameter of the communication port is d, the air outlet (14) is a rectangular port, the width of the air outlet (14) is b, and d/b is greater than or equal to 2.5 and less than or equal to 3.5.

7. Air guide assembly according to claim 1, characterized in that the length of the flow-through duct section (11) is H₁The length of the tapered section (12) is H₂Wherein, 2 is less than or equal to H₁/H₂≤3。

8. The air guide assembly as recited in claim 1, characterized in that the gradual change angle of the tapered section (12) is α, 35 ° ≦ α ≦ 50 °.

9. Air guide assembly according to claim 1, characterized in that the heating structure (30) comprises a heating housing (31) and a heating element (32), the heating element (32) being arranged within the heating housing (31), the heating housing (31) being arranged at an end of the tapering section (12) remote from the flow-through pipe section (11), the heating housing (31) being in communication with the tapering section (12).

10. The air guide assembly as claimed in claim 9, wherein the heating housing (31) has a heating inlet (311) and a heating outlet (312), the heating inlet (311) is communicated with the air outlet (14), the heating outlet (312) is located at a side portion of the heating housing (31), the heating inlet (311) and the heating outlet (312) are both rectangular openings, and the heating element (32) is disposed opposite to the heating outlet (312).

11. The air guide assembly as recited in claim 1, further comprising:

a heat insulation frame (90) disposed outside the heating structure (30).

12. The air guide assembly as recited in claim 1, further comprising:

a partition (40) disposed within the tapered section (12), the partition (40) extending along the fan (20) in a direction toward the air outlet (14).

13. A cooking appliance, characterized in that the cooking appliance comprises a wind guide assembly, and the wind guide assembly is the wind guide assembly of any one of claims 1 to 12.