CN109645848B

CN109645848B - Electric cooking appliance

Info

Publication number: CN109645848B
Application number: CN201910152231.7A
Authority: CN
Inventors: 李云龙; 孙炎军; 唐相伟
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2019-02-28
Filing date: 2019-02-28
Publication date: 2021-01-26
Anticipated expiration: 2039-02-28
Also published as: CN109645848A

Abstract

The invention discloses a cooking appliance, comprising: the wind turbine comprises a turbine body and a wind wheel, wherein a hot air hood is arranged on the turbine body, a first ventilation area and a second ventilation area are arranged on the hot air hood, and a plurality of guide vanes which are distributed at intervals along the circumferential direction of the first ventilation area are arranged around the first ventilation area; the wind wheel is opposite to the first ventilation area in a front-back mode, the guide vanes are provided with outer ends far away from the first ventilation area and inner ends close to the first ventilation area, the guide vanes are divided into first guide vanes and second guide vanes, and the difference value between the distance L11 from the outer ends of the first guide vanes to the rotating shaft of the wind wheel and the distance L12 from the inner ends of the first guide vanes to the rotating shaft of the wind wheel is larger than the difference value between the distance L21 from the outer ends of the second guide vanes to the rotating shaft of the wind wheel and the distance L22 from the inner ends of the second guide vanes to the rotating shaft of the wind. According to the cooking appliance provided by the embodiment of the invention, the guide vane structures with different lengths are added on the hot air cover, so that the function of enhancing the airflow for guiding can be realized.

Description

Electric cooking appliance

Technical Field

The invention relates to the technical field of micro steaming and baking, in particular to an electric cooking appliance.

Background

In the technical field of micro steaming and baking, the uniformity of hot air function is one of the most key indexes of baking performance, and the main technical means for improving the uniformity of hot air function at present is to optimize the structural shape of a hot air cover, the number of air outlet holes of the hot air cover and the arrangement position. The technical means is mainly to adjust the heat transferred by hot air received by different positions on the baking tray or the grill by adjusting the wind direction and the air quantity of the outlet air of the air outlet hole of the hot air cover so as to achieve the purpose of improving the uniformity in the cavity.

Disclosure of Invention

The invention provides a cooking appliance, which can realize the function of enhancing airflow to guide flow by adding guide vane structures with different lengths on a hot air cover.

According to the embodiment of the invention, the cooking appliance comprises: the cooking machine comprises a machine body and a wind wheel, wherein a cooking cavity is formed in the machine body, a hot air cover is covered on the rear side wall of the cooking cavity, a first ventilation area and a second ventilation area are arranged on the hot air cover, the first ventilation area and the second ventilation area are both provided with ventilation holes, and a plurality of guide vanes which are distributed at intervals along the circumferential direction of the first ventilation area are arranged around the first ventilation area; the wind wheel with the first ventilation district is relative from beginning to end, wherein, the guide vane has and keeps away from the outer end in first ventilation district and is close to the inner of first ventilation district, a plurality of guide vanes are divided into first guide vane and second guide vane, the difference of the outer end of first guide vane to the distance L11 of the rotation axis of wind wheel with the difference of the inner end of first guide vane to the distance L12 of the rotation axis of wind wheel is greater than the difference of the outer end of second guide vane to the distance L21 of the rotation axis of wind wheel with the inner end of second guide vane to the distance L22 of the rotation axis of wind wheel.

According to the cooking appliance provided by the embodiment of the invention, the guide vane structures with different lengths are added on the hot air cover, so that the function of enhancing the airflow for guiding can be realized.

In addition, the cooking appliance according to the above embodiment of the present invention may further have the following additional technical features:

in some embodiments, the distance L11 is equal to the distance L21, and the distance L22 is between the distance L11 and the distance L12.

In some embodiments, the first guide vane comprises a plurality of guide vanes arranged at intervals in a direction surrounding the first ventilation zone, and at least one second guide vane is arranged between at least two adjacent first guide vanes.

In some embodiments, the ratio of the difference between the distance L21 and the distance L22 to the difference between the distance L11 and the distance L12 is 1/2.

In some embodiments, the guide vanes extend along an arc in a direction away from the first plenum, and a plurality of the guide vanes have the same tendency and direction of extension in the direction away from the first plenum.

In some embodiments, a plurality of the guide vanes are arranged on both left and right sides of the first plenum.

In some embodiments, the top and the bottom of the hot air hood are provided with profiling strips extending in the left-right direction, the first ventilation area is located between the profiling strips at the top and the bottom of the hot air hood, the upper edge and the lower edge of the first ventilation area are both adjacent to the corresponding profiling strips, and the left end and the right end of the profiling strips extend out of the first ventilation area in a downward projection.

In some embodiments, the first ventilation area is disposed at a middle position of the hot air hood in a left-right direction, and the second ventilation area is disposed at least one of a left upper portion, a left lower portion, a right upper portion, and a right lower portion of the hot air hood.

In some embodiments, the first ventilation area is spaced apart by a plurality of the ventilation holes, and the plurality of the ventilation holes are arranged in a circular matrix.

In some embodiments, the first ventilation zone is arranged as a sunken platform structure recessed relative to a surface of the hot air hood.

Drawings

Fig. 1 is a schematic view of a hot air hood of a cooking appliance according to an embodiment of the present invention.

Fig. 2 is a schematic view of the cooperation of a hot air hood and a wind wheel of the cooking appliance according to one embodiment of the invention.

Fig. 3 is a schematic view of the degree of diffusion.

Reference numerals: the wind power generation device comprises a hot air cover 1, a first ventilation area 101, a second ventilation area 102, guide vanes 12, first guide vanes 121, second guide vanes 122, a diffusion degree theta, a compression strip 13, a distance L11 from the outer ends of the first guide vanes 121 to a rotating shaft of a wind wheel, a distance L21 from the outer ends of the second guide vanes 122 to the rotating shaft of the wind wheel, a distance L22 from the inner ends of the second guide vanes 122 to the rotating shaft of the wind wheel, a distance L12 from the inner ends of the first guide vanes 121 to the rotating shaft of the wind wheel, and a wind wheel 2.

Detailed Description

The invention belongs to the technical field of micro-steaming and baking electrical appliances, and relates to all micro-steaming and baking electrical appliances with a hot air function. The uniformity of the hot air function is one of the most critical indexes of the baking performance, and the main technical means for improving the uniformity of the hot air function at present is to optimize the structural shape of the hot air cover, the number of air outlets of the hot air cover and the arrangement position. The technical means is mainly to adjust the heat transferred by hot air received by different positions on the baking tray or the grill by adjusting the wind direction and the air quantity of the outlet air of the air outlet hole of the hot air cover so as to achieve the purpose of improving the uniformity in the cavity. The invention adopts the guide vanes 12 to achieve the purpose of improving the uniformity.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

Referring to fig. 1, according to the cooking appliance of the embodiment of the present invention, the cooking appliance of the present invention may be a micro-steaming and baking appliance, an oven, a microwave oven, or the like, and the cooking appliance of the present invention includes a machine body and a wind wheel, a cooking cavity is disposed in the machine body, and a hot air hood and the wind wheel are disposed in the cooking cavity, wherein a first ventilation area and a second ventilation area are disposed on the hot air hood, and under the driving action of the wind wheel, an air flow circulates in the hot air hood and the cooking cavity through the first ventilation area and the second ventilation area.

Specifically, a cooking cavity (not shown in the figure) is arranged in the machine body, a hot air cover is covered on the rear side wall of the cooking cavity, a first ventilation area and a second ventilation area are arranged on the hot air cover, the first ventilation area and the second ventilation area are both provided with ventilation holes, and air flow can circulate between the inner space of the hot air cover and the cooking cavity through the ventilation holes of the first ventilation area and the second ventilation area.

In the invention, a plurality of guide vanes 12 are arranged around the first ventilation area, the guide vanes 12 are arranged on the hot air cover 1, the guide vanes 12 extend along the direction far away from the first ventilation area 101, the guide vanes 12 are arranged at intervals along the circumferential direction of the first ventilation area 101, vane channels can be formed between adjacent guide vanes 12, and air flow can circulate under the guidance of the guide vanes 12. Optionally, a plurality of vanes 12 are arranged in a divergent shape. Optionally, a plurality of vanes 12 are arranged in a diverging pattern centered on the axis of rotation of the wind rotor.

Optionally, the hot air hood 1 is disposed opposite to the wind wheel (or the fan, the blower, etc.), the wind wheel, etc. may be opposite to the first ventilation area 101, the airflow may circulate under the driving action of the wind wheel, and under the driving action of the wind wheel, etc., the airflow may circulate along the guide vane 12, and the airflow is guided by the guide vane 12.

According to the cooking appliance provided by the embodiment of the invention, the guide vanes 12 can be used for guiding the airflow of the wind wheel and the like, the guide vanes 12 play a role in guiding the airflow flowing direction, the airflow can flow along the track of the blade channels of the guide vanes 12, and the flow loss in the blade channels formed by the guide vanes 12 is reduced.

The hot air hood 1 is provided with a through hole, the through hole is communicated with the hot air hood 1, optionally, the hot air hood 1 is vertically arranged on the rear side wall of the cooking cavity, the hot air hood 1 can be arranged in a mode of comprising a base plate and a coaming plate, the coaming plate is connected with the edge of the base plate, the coaming plate and the base plate are combined to form a cavity structure which is open backwards, at least one of the first ventilation area and the second ventilation area can be arranged on the base plate, and therefore the through hole can be communicated with the base plate along the direction perpendicular to the base plate; at least one of the first ventilation area and the second ventilation area can also be arranged on the enclosing plate, and the corresponding ventilation hole can penetrate through the base plate along the direction perpendicular to the enclosing plate. These descriptions are, of course, only used to facilitate an understanding of the present invention and are not intended to limit the scope of the present invention.

In addition, for example, a heating element can be arranged in the hot air hood, under the driving action of the wind wheel, the first ventilation area can be set to enable air flow to flow into the cooking cavity from the interior of the hot air hood, and the second ventilation area can be set to enable air flow to flow into the hot air hood from the interior of the cooking cavity, wherein the hot air hood can be covered on the rear wall surface of the cooking cavity, a cavity is formed between the hot air hood and the rear wall surface of the cooking cavity and used for placing the heating element, and the air flow can enter the cavity to exchange heat with the heating element and then flow into the cooking cavity to cook.

In the present invention, when the plurality of guide vanes 12 are disposed to surround the first ventilation area, the diffusion degree of the blade path of the plurality of guide vanes 12 may be too large, and especially, the diffusion degree of the second half section (a position far away from the first ventilation area) of the blade path formed between the guide vanes 12 is increased too much, which easily causes a serious separation loss, thereby increasing the energy loss of the airflow. On the other hand, an excessive diffusion leads to an excessive slip coefficient of the outlet, so that the airflow cannot flow out in the direction guided by the guide vane 12, thereby weakening the function of the guide vane 12 in guiding the airflow.

As shown in fig. 1, in some embodiments of the present invention, the guide vane 12 has an outer end far from the first ventilation zone and an inner end near the first ventilation zone, the plurality of guide vanes 12 are divided into a first guide vane 121 and a second guide vane 122 (of course, other forms, such as a third guide vane, etc., may be included in the plurality of guide vanes 12), a distance L11 from the outer end of the first guide vane 121 to the rotation axis of the wind wheel is different from a distance L12 from the inner end of the first guide vane 121 to the rotation axis of the wind wheel by L11-L12, a distance L21 from the outer end of the second guide vane 122 to the rotation axis of the wind wheel is different from a distance L22 from the inner end of the second guide vane 122 to the rotation axis of the wind wheel by L21-L22, wherein L11-L12 is greater than L21-L22, that is, the plurality of guide vanes 12.

Because the guide vanes 12 are arranged along the direction surrounding the first ventilation area, the gap between the guide vanes 12 is smaller at the position close to the first ventilation area, and the gap between the guide vanes 12 is larger at the position far away from the first ventilation area, so that the purpose of reducing the gap between the guide vanes 12 can be realized by arranging the guide vanes 12 with different lengths.

The outer end of the first guide vane 121 is the end of the first guide vane 121 far away from the first ventilation area, and the inner end of the first guide vane 121 is the end of the first guide vane 121 close to the first ventilation area; the outer end of second vane 122 is the end of second vane 122 distal from the first plenum, and the inner end of second vane 122 is the end of second vane 122 proximal to the first plenum.

In addition, the guide vanes 12 with different lengths can reduce the diffusion degree, the reduction of the diffusion degree is beneficial to inhibiting the generation of flow separation in the vane channels, and airflow flows along the track of the vane channels of the guide vanes 12, so that the flow loss in the vane channels can be reduced, and the flow guiding effect of the vane channels on the airflow is enhanced.

Specifically, compared with a structure with a plurality of guide vanes 12 having the same length, the guide vanes 12 having different lengths are provided in the invention, so that the structure of the guide vanes 12 (or the number of the guide vanes 12) can be increased, and sudden expansion loss of the wind wheel outlet flow (the sudden expansion loss is one of flow losses) can be reduced; optionally, the short blade is added between the two long blades, so that the diffusion degree of the second half section of the blade channel can be reduced, the reduction of the diffusion degree is favorable for inhibiting the generation of flow separation in the blade channel, and airflow flows along the track of the blade channel of the guide vane 12, so that the flow loss in the blade channel can be reduced, and the flow guiding effect of the blade channel on the airflow is enhanced.

Regarding the diffusion degree, as shown in fig. 3, an angle θ is the diffusion degree, and as shown in fig. 1, a circle is drawn by taking the rotation axis of the wind wheel as the center, two sections of arcs are formed between the three adjacent guide vanes 12, and a central angle corresponding to a midpoint of the two end arcs is the diffusion degree θ.

As an example, ten long blades (i.e., the first guide vane 121) and ten short blades (i.e., the second guide vane 122) are included in the embodiment of the present invention, respectively, but the scope of the present invention is not limited thereto, and other same or different numbers of long blades and short blades may be provided as well.

Alternatively, distance L11 is equal to distance L21, and distance L22 is between distance L11 and distance L12. The uniform guiding of the airflow can be realized, and due to the natural structure of the divergent shape, the distance between the long guide vanes 12 far away from the first ventilation area is increased, so that the short guide vanes 12 are arranged at the positions far away from the first ventilation area between the long guide vanes 12, the diffusion degree can be effectively reduced, and the flow loss of the blade channel is further effectively reduced.

Of course, the distance L11 and the distance L21 may be different in the present invention.

Optionally, the first guide vane 121 includes a plurality of guide vanes 122 arranged at intervals in a direction surrounding the first ventilation area 101, and at least one second guide vane 122 is disposed between at least two adjacent first guide vanes 121. For example, one second guide vane 122 is disposed between two adjacent first guide vanes 121; or two or more second guide vanes 122 are provided between adjacent two first guide vanes 121. Here, the second guide vane 122 may be disposed between each adjacent two first guide vanes 121, and the second guide vane 122 may also be disposed in at least a part of a plurality of gaps formed between the plurality of first guide vanes 121.

Preferably, one second guide vane 122 is arranged between every two adjacent first guide vanes 121; or one first guide vane 121 is arranged between every two adjacent second guide vanes 122. In other words, first vanes 121 and second vanes 122 are staggered. In addition, between two adjacent first guide vanes 121 (or second guide vanes 122), a plurality of second guide vanes 122 (or first guide vanes 121) may be provided as well.

In addition, at least one first guide vane 121 may also be provided between at least two adjacent second guide vanes 122.

Optionally, the ratio of the difference between distance L21 and distance L22 to the difference between distance L11 and distance L12 is 1/2. That is to say that

In combination with the previous embodiments, L21 is the same as L11, so

Of course, the above ratio may be other than 1/2, for example,

are provided in a form greater than 1/2 or less than 1/2, and, optionally,

set to 0.1, 0.3, 0.8, etc.

According to the technical scheme, a short blade is added between two long blades, the specific structural dimension is marked as shown in fig. 1, the outlet diameter L21 of the short blade is equal to the outlet diameter L11 of the long blade, and the inlet diameter L22 of the short blade is equal to 1/2 of the sum of the inlet diameter L12 and the outlet diameter L11 of the long blade (namely L22 is (L12+ L11)/2).

Optionally, the plurality of vanes 12 have the same tendency and direction of extension in a direction away from the first plenum 101. That is, the inclination direction of the plurality of vanes 12 during the extension in the direction away from the first plenum 101 is substantially the same. Still alternatively, the plurality of vanes 12 extend obliquely in the clockwise direction, obliquely in the counterclockwise direction, obliquely first in the clockwise direction and then in the counterclockwise direction, obliquely first in the counterclockwise direction and then in the clockwise direction, and the like in the course of extending in the direction away from the first ventilation zone 101. Of course, the specific extension direction of the guide vane 12 is intended here to describe one specific embodiment of the invention, while the extension tendency and extension direction are to be interpreted and not as a limitation of the scope of protection of the invention. In addition, since the first guide vane and the second guide vane have different lengths, the extending trend and direction of the first guide vane and the second guide vane may not be completely the same, and it should be understood that the first guide vane and the second guide vane have the same extending trend and direction at the opposite part along the circumferential direction of the wind wheel rotating shaft.

In addition, a plurality of guide vanes have the same extension trend and extension direction, which can also be understood as follows: a circumference is drawn with the rotor rotation axis as a center, the circumference intersects with the plurality of guide vanes, and a tangent of an intersection point on the guide vane is inclined by a predetermined angle in a predetermined direction with respect to a line connecting the intersection point and the rotor rotation axis, the predetermined angle being substantially the same (for example, a difference in a range of 0 ° to 30 °) among the plurality of guide vanes.

Optionally, the vanes 12 are in the form of arcs of circles. Specifically, the guide vane 12 is in the shape of a circular arc (or extends along a circular arc line) in the course of extending in a direction away from the first ventilation zone 101. The 12-blade profile of the long guide blade and the short guide blade are both in a single arc shape, so that the processing and the manufacturing are convenient. The vane 12 structure may be added by welding or sheet metal casting.

Of course, the vanes 12 may likewise be elongated in the direction of an elliptical arc, a straight line, a spline curve, a wavy line, a broken line, or the like. All of which should be considered within the scope of the present invention. That is, the vanes extend along arcs, lines, polylines, etc. in a direction away from the first plenum.

In addition, in the actual use process, a plurality of guide vanes 12 can be uniformly arranged along the circumferential direction of the first ventilation area 101, that is, the guide vanes 12 are arranged on four side surfaces of the guide vanes 12, so as to form a plurality of blade passages arranged around the first ventilation area 101. The arrangement mode has some defects that guide vane 12 structures are arranged on the periphery of the wind wheel, the size of the hot air cover is greatly increased in the vertical direction, and further the size of the cavity and even the size of the whole machine in the vertical direction are increased greatly, so that the cost of the product is increased; on the other hand, the increase in the size of the cavity leads to an increase in the volume of the cavity, so that the prior art solution is only suitable for products with large-volume cavities, i.e., the prior art solution is limited in the application range.

Alternatively, in the present invention, a plurality of vanes 12 are arranged on opposite sides (right and left sides in fig. 1 or 2) of the first ventilation zone 101. That is, the aforementioned plurality of guide vanes 12 are provided on opposite sides of the first ventilation zone 101, and the aforementioned guide vanes 12 are not provided on the other two sides of the first ventilation zone 101. This reduces the space occupied by the guide vanes 12 and thus the size of the hot air hood 1.

Optionally, the guide vanes are arranged on both left and right sides of the first ventilation zone (in other words, no guide vanes are provided on both upper and lower sides of the first ventilation zone).

Take hot-blast cover 1 along vertical setting and extend along left right direction as the example, at this moment, can set up aforementioned stator 12 in the left and right sides of first ventilation district 101, and do not set up aforementioned stator 12 in the upper and lower both sides of first ventilation district 101, like this, the size along upper and lower direction of first ventilation district 101 will no longer receive the restriction of stator 12, moreover, because hot-blast cover 1 extends along left right direction, the left and right sides of first ventilation district 101 also has enough big space to place aforementioned stator 12. Therefore, this arrangement can effectively increase the size of the first ventilation zone 101 without substantially affecting the size of the heat blast cover 1.

Particularly, in the oven, by the above arrangement, compared with the scheme that the guide vanes 12 are arranged on all four sides of the first ventilation area 101, the area of the first ventilation area 101 in the above embodiment of the present invention may be set to be large enough to improve the airflow guiding effect for the oven and other devices.

Alternatively, as shown in fig. 1, the first ventilation zone 101 is provided with a plurality of ventilation holes at intervals. That is to say, set first ventilation zone 101 to the grid, forms such as sieve form, the air current can follow first ventilation zone 101 even circulation, and, the air current is when a plurality of ventilation holes through first ventilation zone 101, the noise of gaseous circulation in-process can be reduced to the interact between the air current, and can also make the air current can carry out the heat transfer with all ring edge borders more steadily, improve heat exchange efficiency effectively, when outwards carrying the air current through this ventilation hole, can avoid the influence of the indoor hot air of culinary art to all ring edge borders effectively.

Specifically, the plurality of vent holes of the first vent area are arranged in a matrix form, for example, in a matrix form arranged in a transverse and longitudinal direction. Alternatively, as shown in fig. 1, a plurality of vent holes of the first ventilation zone in the present invention are arranged in a circular matrix form. That is, the plurality of ventilation holes of the first ventilation zone are arranged in a plurality of concentric circles centering on the first ventilation zone, and a plurality of ventilation holes are arranged on each circle. Of course, a vent hole may be provided at the center of the concentric rings.

Alternatively, the first ventilation zone 101 is arranged as a sunken structure recessed with respect to the surface of the hot air hood 1. That is, a groove structure is formed on the hot air hood 1, and the bottom wall of the groove structure forms the aforementioned first ventilation area 101, wherein the first ventilation area 101 can be disposed at the center of the hot air hood 1, that is, the first ventilation area 101 is spaced apart from each edge of the hot air hood 1.

Therefore, the corresponding installation of the hot air cover 1 and the wind wheel can be facilitated, and the structural strength of the hot air cover 1 can be effectively improved by the sinking platform structure.

According to the invention, a guide vane 12 structure can be added in the hot air cover, and the guide vane 12 structure is positioned at the outlet of the wind wheel, so that the function of guiding the airflow at the outlet of the wind wheel can be realized.

In an oven, the guide vane 12 structure in the invention is located at the outlet position of a wind wheel, the middle circular hole position is the position of the wind wheel (the wind wheel is not shown in fig. 1, and the wind wheel is shown in fig. 2), and a plurality of straight guide vanes 12 or radial guide vanes 12 are arranged at the periphery of the outlet of the wind wheel, so that the outlet airflow of the wind wheel flows out along the radial direction of the guide vanes 12, and the airflow flowing direction is guided.

The invention overcomes the defect that the prior technical scheme can not be applied to small-capacity cavity products, and can be applied to products with cavities of any capacity. The invention solves the problem of poor flow guide effect in the prior art.

The structure of the technical scheme of the invention is shown in figure 1. According to the technical scheme, guide vane 12 structures in the form of long and short blades are arranged on the two sides of the left outlet and the right outlet of the wind wheel. According to the technical scheme, the guide vane 12 structures are not arranged at the top and the bottom of the wind wheel, so that the size requirement of the guide vane 12 structures on the vertical direction of the hot air cover can be reduced, and the guide vane 12 structure in the technical scheme can be applied to oven products with any capacity.

In addition, in the present invention, the top and the bottom of the hot air cover are provided with the profiling strips 13 extending along the left-right direction, the profiling strips 13 can be formed into a concave structure, a convex structure, etc. on the hot air cover, for example, a part of the hot air cover can be concave (for example, by punching, etc.), so as to form a concave on one side surface of the hot air cover and a convex on the other side surface of the hot air cover; the hot air hood may be further provided with a protrusion structure, for example, a molding strip 13 is further connected to the surface of the hot air hood by welding, bonding, snapping, screwing, or the like.

The first ventilation zone is located between the profiling strips 13 at the top and bottom of the hot air hood. Because first ventilation zone need set up the ventilation hole, probably there is a large amount of ventilation holes in first ventilation zone, through setting up profiling strip 13, can improve the structural strength who covers corresponding position on hot-blast cover, improve the stability and the security of hot-blast cover effectively.

The upper and lower edges of the first ventilation zone are adjacent to the corresponding profiling strips 13, and the effect of the profiling strips 13 on the increase of the structural strength is further improved. Furthermore, the profiling strip 13 means a cut-off, meaning the end of the first ventilation zone, thus effectively improving the efficiency of the forming and assembly of the hot air hood.

First ventilation areas extend from the left end and the right end of the profiling strip 13 in downward projection. That is, the profiling strip 13 covers the first ventilation area, further effectively improving the structural strength of the hot air hood.

Optionally, the first ventilation area is disposed at a middle position of the hot air hood along the left-right direction, and at least one of the upper left portion, the lower left portion, the upper right portion, and the lower right portion of the hot air hood is provided with the second ventilation area.

Wherein, the second ventilating area can be the form of surrounding the setting of first ventilating area, can improve culinary art efficiency and effect effectively.

The cooking appliance according to the present invention comprises: organism and wind wheel 2. Can locate the back in the internal culinary art chamber with hot-blast cover for form hot-blast rifle chamber between the back in hot-blast cover and culinary art chamber, realize air cycle through the wind wheel, thereby make the steam in the hot-blast cover can get into the culinary art intracavity under the drive effect of air current and cook.

Alternatively, the wind rotor 2 may be opposed to the first ventilation zone 101 in the front-rear direction.

The guide vanes 12 of the technical scheme of the invention are arranged on the left side and the right side of the wind wheel (or called a hot air fan) outlet, and the guide vanes 12 are not arranged on the top side and the bottom side, so that the size requirement of the hot air cover in the vertical direction can be reduced, and the technical scheme is favorably applied to a small-capacity oven. Because the speed of the air flow at the wind wheel outlet is high, if no guide vane is arranged, or the diffusion degree of the blade channel of the guide vane 12 is high, large sudden expansion loss can be caused, so that the energy loss of the air flow is caused, and the heating efficiency of hot wind is reduced. Meanwhile, the large diffusion degree of the blade channel can cause airflow separation, generate backflow vortex and disturb the normal flow of the airflow in the guide vane 12, so that the flow guiding effect of the guide vane 12 is poor. According to the technical scheme, the short guide vane 12 is added between the two long guide vanes 12, so that the diffusion degree of a guide vane 12 flow channel can be reduced, the flow separation and the generation of airflow vortexes in the guide vane 12 flow channel are reduced, and the guide effect of the guide vane 12 is enhanced; and the short blades are arranged at the middle rear ends of the long blades, so that the increase of airflow impact loss at the front edges of the long guide vanes 12 caused by the increase of the number of the blades can be avoided, and the on-way friction loss of the blade channels (which is one of flow loss) can be reduced, thereby being beneficial to reducing the energy loss of the airflow in the flow channels of the guide vanes 12.

In the invention, the guide vane 12 structures are only arranged on the left side and the right side of the outlet of the hot air wheel, the guide vanes 12 are in a long and short blade structure form, the molded lines of the long and short blades are all single circular arcs, and the short blade is arranged in the middle of the two long blades. The invention relates to a guide vane 12 structure in the form of long and short blades and an arrangement method of the guide vane 12 structure.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. 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 and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. Cooking appliance, characterized in that it comprises:

the cooking machine comprises a machine body, wherein a cooking cavity is formed in the machine body, a hot air cover is covered on the rear side wall of the cooking cavity, a first ventilation area and a second ventilation area are arranged on the hot air cover, the first ventilation area and the second ventilation area are both provided with ventilation holes, and a plurality of guide vanes which are distributed at intervals along the circumferential direction of the first ventilation area are arranged around the first ventilation area; the wind wheel is opposite to the first ventilation area in the front-back direction; the guide vanes have an outer end remote from the first ventilation zone and an inner end near the first ventilation zone, the plurality of guide vanes are divided into a first guide vane and a second guide vane, a difference between a distance L11 from the outer end of the first guide vane to the rotation axis of the wind wheel and a distance L12 from the inner end of the first guide vane to the rotation axis of the wind wheel is greater than a difference between a distance L21 from the outer end of the second guide vane to the rotation axis of the wind wheel and a distance L22 from the inner end of the second guide vane to the rotation axis of the wind wheel,

and drawing a circumference by taking the wind wheel rotating shaft as a center, wherein the circumference is intersected with the guide vane, the tangent of the intersection point on the guide vane inclines towards a preset angle in a preset direction relative to the connecting line of the intersection point and the wind wheel rotating shaft, and the preset angles are the same.

2. The cooking appliance according to claim 1, characterized in that the distance L11 is equal to the distance L21 and the distance L22 is between the distance L11 and the distance L12.

3. The cooking appliance according to claim 1, wherein the first guide vanes comprise a plurality of guide vanes spaced apart in a direction around the first ventilation zone, and at least one second guide vane is disposed between at least two adjacent first guide vanes.

4. The cooking appliance according to any of the claims 1-3, characterized in that the ratio of the difference between the distance L21 and the distance L22 to the difference between the distance L11 and the distance L12 is 1/2.

5. The cooking appliance according to any one of claims 1 to 3 wherein the guide vanes extend along an arc in a direction away from the first plenum, a plurality of the guide vanes having the same tendency and direction of extension in a direction away from the first plenum.

6. The cooking appliance according to claim 1, wherein a plurality of the guide vanes are arranged on both left and right sides of the first ventilation zone.

7. The cooking appliance according to claim 1 or 6, wherein the top and the bottom of the hot air hood are provided with profiling strips extending in the left-right direction, the first ventilation area is located between the profiling strips at the top and the bottom of the hot air hood, the upper and the lower edges of the first ventilation area are adjacent to the corresponding profiling strips, and the left and the right ends of the profiling strips extend out of the first ventilation area in a downward projection.

8. The cooking appliance according to any of the claims 1-3, wherein the first ventilating area is provided at a middle position of the hot air hood in a left-right direction, and the second ventilating area is provided at least one of a left upper portion, a left lower portion, a right upper portion and a right lower portion of the hot air hood.

9. The cooking appliance according to any one of claims 1 to 3 wherein the first ventilating area is spaced apart by a plurality of the ventilating holes arranged in a circular matrix form.

10. The cooking appliance according to any of the claims 1 to 3 wherein the first ventilation zone is arranged as a sunken structure with respect to the surface of the hot air hood.