Hot air assembly of cooking utensil and cooking utensil with same

Abstract

The invention discloses a hot air assembly of a cooking utensil and the cooking utensil with the hot air assembly, the hot air assembly comprises a centrifugal fan, the centrifugal fan comprises a motor and a centrifugal impeller connected with the motor, the centrifugal impeller comprises a bottom plate and a plurality of blades, and a shaft hole is formed in the bottom plate; the blades are arranged on the bottom plate at intervals in the circumferential direction of the bottom plate, the blades obliquely extend in the circumferential direction of the centrifugal impeller in the radial direction of the centrifugal impeller from inside to outside, the oblique extending direction of the blades is the same as the rotating direction of the centrifugal impeller, and the centrifugal impeller meets the conditions that 0.65 < = D2 / D1 < = 0.75, 39 degrees < = a1 < = 51 degrees, 51 degrees < = a2 < = 71 degrees and 8 < = n < = 12, a1 is an inlet mounting angle of blades of the centrifugal impeller, a2 is an outlet mounting angle of the blades, and n is the number of the blades and is an integer; and the heating piece is arranged around the centrifugal impeller. According to the hot air assembly, the air inlet amount and the air speed entering the cooking cavity can be increased, and the cooking effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a hot air component of a cooking utensil and a cooking utensil having the hot air component. Background Art

[0002] Air frying ovens have been sought after by more and more people due to their unique function of defatting and reducing oil. Air frying uses high-temperature air heat flow as a heat transfer medium to achieve the frying effect by precipitating the oil in the food itself through high temperature. In existing ovens with air frying, the main air frying hot air components are the heating tube and centrifugal fan on the top. When the hot air structure is working, the centrifugal fan and the heating tube are started at the same time. The air in the middle of the centrifugal fan is sucked in and the air is centrifuged to the surroundings through the rotation of the blades. The high-speed airflow thrown out by the centrifugal action is heated by convection and radiation through the high-temperature heating section to increase the air temperature, and then enters the cavity through the small holes to heat the food in the cavity. However, the conversion rate of the motor power of the hot air structure into the air volume at the air outlet is extremely low, resulting in a slow air flow rate and a small flow rate entering the cooking cavity, which in turn causes the problem of long cooking time and poor cooking effect. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention is to provide a hot air assembly of a cooking appliance, which can increase the air volume and wind speed entering the cooking cavity, thereby reducing the cooking time and improving the cooking efficiency, thereby reducing energy consumption and improving the cooking effect.

[0004] The present invention also provides a cooking utensil having the hot air assembly of the cooking utensil.

[0005] A hot air assembly of a cooking utensil according to a first aspect of the present invention comprises: a centrifugal fan, the centrifugal fan comprises a motor and a centrifugal impeller connected to the motor, the centrifugal impeller comprises: a bottom plate and a plurality of blades, the bottom plate is provided with an axial hole; the plurality of blades are arranged on the bottom plate at intervals along the circumference of the bottom plate, the blades extend obliquely along the circumference of the centrifugal impeller in a radial direction from inside to outside of the centrifugal impeller, the direction of the oblique extension of the blades is the same as the rotation direction of the centrifugal impeller, the centrifugal impeller satisfies: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, wherein D2 / D1 is a hub ratio of the centrifugal impeller, a1 is an inlet installation angle of the blades of the centrifugal impeller, a2 is an outlet installation angle of the blades, and n is the number of the blades and is an integer; a heating element, the heating element is arranged around the centrifugal impeller.

[0006] According to the hot air assembly of the cooking utensil of the present invention, by making the centrifugal impeller meet the conditions of: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, the airflow can enter and be discharged from the airflow channel between two adjacent blades more smoothly, and the flow rate balance of the airflow at various locations in the channel between two adjacent blades can be increased, so that the airflow can flow smoothly in the channel between two adjacent blades, thereby preventing energy waste caused by turbulence of the airflow and improving the efficiency of the fan. Therefore, the air intake volume and wind speed entering the cooking cavity can be increased, thereby reducing the cooking time and improving the cooking efficiency, thereby reducing energy consumption and improving the cooking effect.

[0007] According to some embodiments of the present invention, the centrifugal impeller satisfies: 0.69≤D2 / D1≤0.71, 42°≤a1≤48°, 56°≤a2≤66°, 9≤n≤11.

[0008] According to some embodiments of the present invention, the motor is a shaded-pole motor.

[0009] According to some embodiments of the present invention, it also includes: a partition, which is arranged perpendicular to the axis of the centrifugal impeller; a wind hood, which is arranged on one side of the partition in the thickness direction, and ventilation holes are formed on the wind hood, the centrifugal impeller is arranged between the wind hood and the partition, and the heating element is located on the side of the wind hood away from the partition.

[0010] According to some embodiments of the present invention, the wind shield is an arc-shaped plate protruding away from the partition.

[0011] According to some embodiments of the present invention, the hot air assembly also includes: a guide plate, which is fixed to the partition and is located on a side of the partition facing the wind hood, the guide plate is connected to the wind hood and cooperates with the wind hood to define a accommodating cavity, the centrifugal impeller is arranged in the accommodating cavity, and a surface of the guide plate on one side facing the wind hood is formed as a guide surface, and the guide surface is an arc surface that is recessed away from the wind hood.

[0012] According to some embodiments of the present invention, the guide plate is an arc-shaped plate protruding toward the partition plate.

[0013] According to some embodiments of the present invention, the base plate has a mounting boss, the mounting boss is circular, and the plurality of blades are arranged radially outside the mounting boss and are evenly spaced along the circumference of the mounting boss.

[0014] According to some embodiments of the present invention, the base plate further comprises: a connecting plate portion, which is connected to the circumferential edge of the mounting boss and extends radially outward along the mounting boss, the connecting plate portion comprises a plurality of connecting plates, the plurality of connecting plates are arranged at intervals along the circumference of the mounting boss, the plurality of connecting plates correspond one-to-one to the plurality of blades, and the blades are connected to one side edge of the corresponding connecting plate in the circumferential direction of the mounting boss.

[0015] According to some embodiments of the present invention, the centrifugal impeller is integrally formed by stamping.

[0016] The cooking appliance according to the second aspect of the present invention comprises the hot air assembly according to the first aspect of the present invention.

[0017] According to the cooking appliance of the present invention, the hot air assembly of the first aspect is provided, thereby improving the overall performance of the cooking appliance.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a hot air assembly of a cooking appliance according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A schematic diagram of a centrifugal impeller shown in ;

[0021] Figure 3 yes Figure 1 Another angle schematic diagram of the centrifugal impeller shown in .

[0022] Reference numerals:

[0023] 100. Hot air component;

[0024] 10. Centrifugal fan; 11. Centrifugal impeller; 111. Blade; 112. Bottom plate; 1121. Mounting boss; 1122. Connecting plate; 1123. Reinforcement rib; 1124. Shaft hole; 12. Motor;

[0025] 20. Heating element; 30. Partition plate; 40. Guide plate. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0027] Reference below Figure 1-Figure 3 A hot air assembly 100 of a cooking appliance according to an embodiment of a first aspect of the present invention is described.

[0028] like Figure 1-Figure 2 As shown, the hot air assembly 100 of the cooking appliance according to the first embodiment of the present invention includes: a centrifugal fan 10 and a heating element 20, the centrifugal fan 10 includes a motor 12 and a centrifugal impeller 11 connected to the motor 12, the centrifugal impeller 11 includes: a bottom plate 112 and a plurality of blades 111, the bottom plate 112 is provided with an axial hole 1124; the plurality of blades 111 are arranged on the bottom plate 112 at intervals along the circumference of the bottom plate 112, and in the radial direction from inside to outside of the centrifugal impeller 11, the blades 111 extend obliquely along the circumference of the centrifugal impeller 11, and the direction of the oblique extension of the blades 111 is opposite to the rotation direction of the centrifugal impeller 11; the heating element 20 is arranged around the centrifugal impeller 11.

[0029] Among them, the motor 12 is the core component of the centrifugal fan 10. The motor 12 provides driving force for the centrifugal impeller 11. The motor 12 can drive the impeller to rotate, and then drive the air flow to move. The heating element 20 is used to heat and generate high-temperature air, and then heat the food to cook the food. The heating element 20 is arranged around the centrifugal impeller 11, which can increase the heating area and coverage, and then improve the heating efficiency of the gas, thereby improving the cooking efficiency.

[0030] When food needs to be heated, the heating element 20 and the centrifugal fan 10 are turned on. The centrifugal fan 10 drives the centrifugal impeller 11 to rotate, forming a negative pressure at the inlet angle of the centrifugal impeller 11, and then sucking gas into the centrifugal impeller 11. The gas sucked into the centrifugal impeller 11 is discharged after the centrifugal impeller 11 does work and moves around the circumference of the centrifugal impeller 11. The heating element 20 surrounds the outer side of the centrifugal impeller 11, heats the gas after the impeller does work, and then discharges the heated gas into the cooking chamber to heat the food, thereby completing the cooking work.

[0031] Specifically, the bottom plate 112 provides an installation position and a support function for the blades 111. The blades 111 are connected to the bottom plate 112. The channel between two adjacent blades 111 forms an airflow channel, which is used for gas circulation. An axial hole 1124 is provided on the bottom plate 112. The axial hole 1124 is circular and is arranged at the center of the bottom plate 112. A plurality of blades 111 are arranged at intervals along the circumference of the bottom plate 112, that is, a plurality of blades 111 are arranged at intervals along the circumference of the axial hole 1124. The blades 111 extend obliquely along the circumference of the centrifugal impeller 11, and the oblique extension direction is opposite to the rotation direction of the centrifugal impeller 11 in the radial direction from inside to outside of the centrifugal impeller 11, that is, the centrifugal impeller 11 is a backward impeller. Among them, the air flow velocity at the impeller outlet of the backward impeller is relatively small. When the air flow velocity is low, the friction force exerted on the air flow by the air duct is also smaller, thereby reducing the energy loss of the air flow in the process of flowing from the air inlet to the air outlet, so that the shaft work transmitted by the motor 12 can be more converted into the static pressure of the fan. The static pressure of the fan increases, and the greater the static pressure of the fan, the more energy the impeller can transfer to the airflow, thereby increasing the air volume and improving the fan efficiency. In this way, the air volume and wind speed entering the cooking chamber can be increased, thereby reducing the cooking time and improving the cooking effect.

[0032] Furthermore, an axial hole 1124 is formed on the bottom plate 112, and the axial hole 1124 is arranged at the center position of the bottom plate 112. The axial hole 1124 can be assembled with the output shaft of the driving device. The multiple blades 111 are arranged at intervals along the circumference of the bottom plate 112, so that the driving device can drive the multiple blades 111 to rotate by driving the bottom plate 112 to rotate, so that the blades 111 can do work on the airflow and drive the airflow to move.

[0033] In some specific embodiments, the centrifugal impeller 11 satisfies: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, wherein D2 / D1 is the hub ratio of the centrifugal impeller 11, a1 is the inlet installation angle of the blade 111 of the centrifugal impeller 11, a2 is the outlet installation angle of the blade 111, and n is the number of blades 111 and is an integer.

[0034] The hub ratio refers to the ratio of the hub diameter to the impeller diameter. The hub is the part of the impeller connected to the output shaft, and is used to connect the blades 111 and the output shaft. Under a given flow rate, the larger the hub ratio, the greater the output pressure. The output wind pressure of the centrifugal impeller 11 can be changed by changing the hub ratio of the impeller, thereby improving the fan efficiency.

[0035] Specifically, D2 / D1 is the hub ratio of the centrifugal impeller 11, that is, D2 is the diameter of the hub, and D1 is the diameter of the impeller. Figure 3As shown, the distance d2 between the inner end of the blade 111 and the central axis of the base plate 112 is the radius of the hub, wherein the inner end of the blade 111 is the end of the blade 111 close to the central axis of the base plate 112, D2=2×d2; the distance d1 between the outer end of the blade 111 and the axis of the base plate 112 is the radius of the centrifugal impeller 11, wherein the outer end of the blade 111 is the end of the blade 111 away from the shaft hole, D1=2×d1, and then the hub ratio of the centrifugal impeller 11 can be obtained by d2 / d1.

[0036] a1 is the inlet installation angle of the blade 111, which is the angle between the tangent line of the circumference at the inlet end of the blade 111 and the blade 111, wherein the inlet end of the blade 111 is the end of the blade 111 close to the shaft hole 1124. The airflow direction is related to the inlet installation angle of the blade 111, and the airflow direction can be changed by changing the inlet installation angle of the blade 111, reducing the impact loss of the airflow on the blade 111 when entering the airflow channel, thereby improving the fan efficiency.

[0037] Specifically, in a projection plane perpendicular to the central axis of the centrifugal impeller 11, a circle C1 is made with the central axis of the bottom plate 112 as the center O and a line from the center to the inner end of the blade 111 as the radius. The circle C1 and the inner end of the blade 111 form an intersection E1, and then a tangent F1 is made with the intersection E1 as the common intersection point. The angle between F1 and the blade 111 is the inlet installation angle a1 of the blade 111.

[0038] a2 is the outlet installation angle of the blade 111, which is the angle between the tangent line of the circumference of the outlet end of the blade 111 and the blade 111, wherein the outlet end of the blade 111 is the end away from the shaft hole 1124. The outflow direction of the airflow is related to the outlet installation angle of the blade 111, and the outlet installation angle of the blade 111 can be adjusted to change the airflow direction, thereby reducing the collision between the air and the blade 111, ensuring the smoothness of the gas flow, thereby reducing energy loss and noise, and improving the efficiency of the fan.

[0039] Specifically, in a projection plane perpendicular to the central axis of the centrifugal impeller 11, a circle C2 is made with the central axis of the bottom plate 112 as the center O and a line from the center to the outer end of the blade 111 as the radius. The circle C2 and the front end of the blade 111 form an intersection E2, and then a tangent F2 is made with the intersection E2 as the common intersection point. The angle between F2 and the blade 111 is the inlet installation angle a2 of the blade 111.

[0040] n is the number of blades 111. The number of blades 111 of the impeller is an important parameter directly related to the aerodynamic performance of the fan. The number of blades 111 and the cross-sectional shape of the centrifugal impeller 11 determine the cross-sectional area of ​​the airflow channel. When the number of blades 111 is too small, the airflow channel is too wide, which may cause secondary vortices to form in the impeller channel, resulting in pressure loss; when the number of blades 111 is too large, the effective flow area of ​​the gas is reduced, which will cause the impeller inlet impact loss and friction loss along the way to increase, and at the same time increase the load of the impeller main shaft, reducing the total pressure and efficiency of the fan.

[0041] In addition, the effective flow area of ​​the airflow channel can be improved by adjusting the hub ratio and the number of blades 111, and the outflow speed and smoothness of the airflow channel can be improved by adjusting the hub ratio and the number of blades 111, thereby improving the fan efficiency.

[0042] Through experimental calculations, it is found that when the centrifugal impeller 11 satisfies the following conditions: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, the centrifugal impeller 11 can enable the airflow to enter and discharge the airflow channel between two adjacent blades 111 more smoothly, increase the flow velocity balance of the airflow at various locations in the channel between two adjacent blades 111, and thus enable the airflow to flow smoothly in the channel between two adjacent blades 111, thereby preventing energy waste caused by airflow turbulence and improving fan efficiency.

[0043] Among them, the hub ratio can be 0.65, 0.66, 0.67, 0.68, 0.7 or 0.75, the inlet installation angle can be 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 48°, 50° or 51°; the outlet installation angle can be 51°, 52°, 53°, 54°, 55°, 56°, 58°, 60°, 62°, 64°, 65°, 70° or 71°; the number of blades 111 can be 8, 9, 10, 11 or 12.

[0044] For example, when other conditions of the fan are constant, the centrifugal impeller 11 of the present application meets the above parameters, and three groups of the above parameters are randomly selected for simulation experiments, and the experimental data are shown in the following table:

[0045]

[0046]

[0047] It can be seen from the above table that when the hub ratio is 0.65, the inlet installation angle is 39°, the outlet installation angle is 51°, and the number of blades 111 is 8, the static pressure of the fan is increased by 19.58% relative to the static pressure of the existing fan, and the air volume is increased by 9.64% relative to the air volume of the existing fan; when the hub ratio is 0.70, the inlet installation angle is 45°, the outlet installation angle is 61°, and the number of blades 111 is 10, the static pressure of the fan is increased by 24.52% relative to the static pressure of the existing fan, and the air volume is increased by 13.25% relative to the air volume of the existing fan; when the hub ratio is 0.71, the inlet installation angle is 51°, the outlet installation angle is 71°, and the number of blades 111 is 12, the static pressure of the fan is increased by 18.76% relative to the static pressure of the existing fan, and the air volume is increased by 10.12% relative to the air volume of the existing fan. It can be seen that the fan static pressure and fan air volume show a trend of first increasing and then decreasing with the increase of parameters. Among them, the hub ratio is 0.70, the inlet installation angle is 45°, the outlet installation angle is 61°, and the number of blades 111 is 10, which are the optimal parameters. Under this condition, the static pressure increase and air volume increase are the highest.

[0048] According to the hot air assembly 100 of the cooking appliance according to the embodiment of the present invention, by making the centrifugal impeller 11 satisfy the following conditions: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, the airflow can be more smoothly introduced into and discharged from the airflow channel between two adjacent blades 111, and the flow velocity balance of the airflow at various locations in the channel between two adjacent blades 111 can be increased, so that the airflow can flow smoothly in the channel between two adjacent blades 111, thereby preventing energy waste caused by turbulence of the airflow and improving the efficiency of the fan. Therefore, the air intake volume and wind speed entering the cooking cavity can be increased, thereby reducing the cooking time, improving the cooking efficiency, thereby reducing energy consumption and improving the cooking effect.

[0049] According to some embodiments of the present invention, the centrifugal impeller 11 satisfies: 0.69≤D2 / D1≤0.71, 42°≤a1≤48°, 56°≤a2≤66°, 9≤n≤11. The fan static pressure increase and fan air volume increase of the centrifugal impeller 11 within this range are both excellent, and when the centrifugal impeller 11 satisfies: 0.69≤D2 / D1≤0.71, 42°≤a1≤48°, 56°≤a2≤66°, 9≤n≤11, the fan static pressure and fan air volume of the centrifugal fan 10 using the centrifugal impeller 11 can be improved, and the air volume and wind speed entering the cooking cavity can be improved, so that the cooking effect of the cooking appliance can be improved.

[0050] According to some embodiments of the present invention, Figure 1As shown, the motor 12 is a shaded pole motor. The shaded pole motor is a type of single-phase AC motor, which usually adopts a cage-type skewed slot cast aluminum rotor. It has a simple structure and is easy to manufacture. It does not require additional windings and capacitors, is suitable for mass production, and has low cost. Therefore, the use of a shaded pole motor as the motor 12 of the centrifugal fan 10 can reduce the production cost of the centrifugal fan 10 while meeting the required speed of the centrifugal fan 10, and further reduce the production cost of the cooking utensils, thereby improving the market competitiveness of the cooking utensils; at the same time, the shaded pole motor generates little noise, and further the use of the shaded pole motor as the motor 12 of the centrifugal fan 10 can also reduce the noise generated by the centrifugal fan 10 during operation, thereby improving the user's comfort.

[0051] According to some embodiments of the present invention, Figure 1 As shown, the cooking utensil also includes: a partition 30 and a hood, the partition 30 is arranged perpendicular to the axis of the centrifugal impeller 11; the hood is arranged on one side of the partition 30 in the thickness direction, and a ventilation hole is formed on the hood, the centrifugal impeller 11 is arranged between the hood and the partition 30, and the heating element 20 is located on the side of the hood away from the partition 30. Therefore, in the direction from the inside to the outside of the cooking utensil, the heating element 20, the hood, the centrifugal impeller 11 and the partition 30 are arranged in sequence. Among them, the partition 30 is used for heat insulation, which can isolate the heating element 20 from the motor 12, thereby reducing the influence of the heating element 20 on the motor 12, thereby increasing the service life of the motor 12; at the same time, the heat insulation board can also reduce the heat loss in the cooking cavity, thereby improving the cooking effect.

[0052] The heating element 20 is arranged on the side of the air cover facing the cooking cavity, so that the heating element 20 can directly heat the food in the cooking cavity, thereby reducing the cooking time of the food and improving the cooking effect.

[0053] The ventilation holes formed on the hood are used to provide air intake to the centrifugal impeller 11 and to provide airflow after the centrifugal impeller 11 has done work to the cooking cavity, so that a circulating heating airflow can be formed in the cooking cavity, thereby increasing the heating uniformity of the cooking cavity. The centrifugal impeller 11 is arranged on the side of the hood away from the cooking cavity, and the hood can be used to cover the centrifugal impeller 11, thereby preventing the centrifugal impeller 11 from being exposed in the cooking cavity, thereby improving the safety of the user when using the cooking utensil, and increasing the aesthetics and safety of the cooking utensil.

[0054] According to some embodiments of the present invention, the hood is an arc-shaped plate protruding away from the partition 30. A protrusion is formed on the side of the hood facing the cooking cavity, so that the hood and the partition 30 can jointly define the installation space of the centrifugal impeller 11; at the same time, the air intake mode of the centrifugal fan 10 is axial air intake and radial air outlet, that is, the gas itself has a large amount of radial velocity after being accelerated by the centrifugal fan 10, and the axial velocity is relatively small, but the air outlet mode of the hot air component 100 is axial air intake and axial air outlet, and then the hood is set to be an arc-shaped plate protruding away from the partition 30, and the ventilation hole can also form a certain angle with the plane perpendicular to the axis of the centrifugal impeller 11, so that the air flow can still have a part of the radial rotation speed when it is discharged from the ventilation hole, so that the air outlet speed and air volume can be increased, thereby improving the cooking effect.

[0055] According to some embodiments of the present invention, Figure 1 As shown, the hot air assembly 100 further includes: a guide plate 40, the guide plate 40 is fixed to the partition plate 30 and is located on the side of the partition plate 30 facing the wind hood, the guide plate 40 is connected to the wind hood and cooperates with the wind hood to define a receiving cavity, the centrifugal impeller 11 is arranged in the receiving cavity, and the surface of the guide plate 40 on the side facing the wind hood is formed as a guide surface, and the guide surface is an arc surface that is concave away from the wind hood. Among them, the centrifugal fan 10 is a device that takes in air axially and discharges air radially, and uses centrifugal force to do work to increase the pressure of air. The airflow after the centrifugal impeller 11 does work moves along the circumference of the centrifugal impeller 11. Furthermore, setting the guide surface as an arc surface that is concave away from the wind hood can prevent the airflow from continuing to flow in the radial direction, change the flow direction, and guide the airflow along the side wall of the guide surface to the ventilation hole of the wind hood, thereby increasing the air output, thereby improving the cooking effect.

[0056] According to some embodiments of the present invention, the guide plate 40 is an arc-shaped plate protruding toward the partition plate 30. The arc-shaped plate has a simple structure and is easy to produce. Using the arc-shaped plate as the guide plate 40 can reduce the production difficulty and production cost of the guide plate 40, thereby reducing the overall production cost of the hot air assembly 100.

[0057] According to some embodiments of the present invention, Figure 2As shown, the bottom plate 112 has a mounting boss 1121, the mounting boss 1121 is circular, and a plurality of blades 111 are arranged on the radial outer side of the mounting boss 1121, and are evenly spaced along the circumference of the mounting boss 1121. Among them, the plurality of blades 111 are evenly spaced along the axial direction of the mounting boss 1121, which can improve the balance of the centrifugal impeller 11, and thus improve the integrity of the centrifugal impeller 11. At the same time, the mounting boss 1121 is used to be connected to the driving device, and the blades 111 are installed on the radial outer side of the mounting boss 1121, and then the driving device can drive the plurality of blades 111 to rotate by driving the mounting boss 1121 to rotate, so that the blades 111 can do work on the airflow and drive the airflow to move. In addition, the mounting boss 1121 is circular, with a simple structure and convenient production, thereby reducing the production cost of the centrifugal impeller 11.

[0058] For example Figure 2 As shown, the mounting boss 1121 is formed by the base plate 112 being recessed from one side to the other side in the thickness direction, the recessed side is adapted to the driving device, and the mounting boss 1121 is in surface contact with the driving device, thereby increasing the contact area with the driving device and improving the installation stability of the centrifugal impeller 11.

[0059] According to some embodiments of the present invention, Figure 2 As shown, the bottom plate 112 also has: a connecting plate portion 1122, the connecting plate portion 1122 is connected to the circumference of the mounting boss 1121 and extends radially outwardly along the mounting boss 1121, the connecting plate portion 1122 includes a plurality of connecting plates, the plurality of connecting plates are arranged at intervals along the circumference of the mounting boss 1121, the plurality of connecting plates correspond to the plurality of blades 111 one by one, and the blades 111 are connected to one side edge of the corresponding connecting plate in the circumferential direction of the mounting boss 1121. For example, the plurality of connecting plates may be two, three or more. Among them, the connecting plate portion 1122 is used to connect the blades 111 and the mounting boss 1121, and the connecting plate portion 1122 provides an installation space for the blades 111; at the same time, the blades 111 are connected to one side edge of the corresponding connecting plate in the circumferential direction of the mounting boss 1121, which can improve the convenience of forming the blades 111.

[0060] Furthermore, the plurality of blades 111 are disposed on one side surface of the connecting plate portion 1122 , and the plurality of blades 111 and the mounting boss 1121 are disposed on the same side, which can facilitate the molding and installation of the centrifugal impeller 11 .

[0061] For example Figure 2 As shown, one end of the blade 111 is connected to one side edge of the connecting piece, and the other end extends in a direction away from the connecting piece, and the blade 111 is vertically connected to the connecting piece.

[0062] In some specific embodiments, for example Figure 2As shown, a reinforcing rib 1123 is formed on the connecting piece, and the reinforcing rib 1123 can increase the structural strength of the connecting piece, and further increase the connection stability of the blade 111. The reinforcing rib 1123 is a convex structure formed on the surface of the connecting piece on the side facing away from the blade 111 and toward the surface of the side close to the blade 111. The convex structure is simple and easy to form, and further can reduce the production process of the blade 111 and reduce the production cost. In addition, one end of the reinforcing rib 1123 is connected to the circumference of the mounting boss 1121, and the other end of the reinforcing rib 1123 extends along the extension direction of the blade 111, which can increase the structural strength of the entire connecting piece, and further can increase the supporting stability of the connecting piece to the blade 111; at the same time, the other end of the reinforcing rib 1123 extends along the extension direction of the blade 111, and further can make the reinforcing rib 1123 and the airflow flow in the same direction, and further can reduce the influence of the reinforcing rib 1123 on the airflow direction. Further, for example Figure 2 As shown, the raised portion of the reinforcing rib 1123 is arc-shaped, and the arc-shaped structure can reduce the influence of the reinforcing rib 1123 on the airflow.

[0063] According to some embodiments of the present invention, the centrifugal impeller 11 is integrally formed by stamping.

[0064] Among them, the stamping one-piece molding structure is simple and easy to manufacture, which can reduce the processing steps of the centrifugal impeller 11, improve the processing speed of the centrifugal impeller 11, shorten the processing cycle, and reduce material consumption and reduce the production cost of the centrifugal impeller 11; at the same time, the one-piece molding can also reduce the installation steps of the centrifugal fan 10, thereby reducing the assembly process of the centrifugal fan 10 and shortening the assembly time.

[0065] The cooking appliance according to the second embodiment of the present invention comprises the hot air assembly 100 according to the first embodiment of the present invention.

[0066] The cooking appliance according to the embodiment of the present invention is provided with the hot air assembly 100 of the first embodiment, thereby improving the overall performance of the cooking appliance.

[0067] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hot air assembly for a cooking appliance, characterized in that: include: A centrifugal fan, comprising a motor and a centrifugal impeller connected to the motor, wherein the centrifugal impeller comprises: a bottom plate and a plurality of blades, wherein the bottom plate is provided with an axial hole; wherein the plurality of blades are arranged on the bottom plate at intervals along the circumference of the bottom plate, wherein in the radial direction from inside to outside of the centrifugal impeller, the blades are obliquely extended along the circumference of the centrifugal impeller, and the direction in which the blades are obliquely extended is the same as the rotation direction of the centrifugal impeller, and the centrifugal impeller satisfies: 0.65≤D2 / D1≤0.75, 39°≤a1≤51°, 51°≤a2≤71°, 8≤n≤12, wherein D2 / D1 is the hub ratio of the centrifugal impeller, a1 is the inlet installation angle of the blades of the centrifugal impeller, a2 is the outlet installation angle of the blades, and n is the number of the blades and is an integer; A heating element is arranged around the centrifugal impeller.

2. The hot air assembly of the cooking appliance according to claim 1, characterized in that: The centrifugal impeller satisfies: 0.69≤D2 / D1≤0.71, 42°≤a1≤48°, 56°≤a2≤66°, 9≤n≤11.

3. The hot air assembly of the cooking appliance according to claim 1, characterized in that: The motor is a shaded-pole motor.

4. The hot air assembly of the cooking appliance according to any one of claims 1 to 3, characterized in that: Also includes: A partition plate, wherein the partition plate is arranged perpendicular to the axis of the centrifugal impeller; The wind hood is arranged on one side of the partition in the thickness direction, and a ventilation hole is formed on the wind hood. The centrifugal impeller is arranged between the wind hood and the partition, and the heating element is located on the side of the wind hood away from the partition.

5. The hot air assembly of the cooking appliance according to claim 4, characterized in that: The wind shield is an arc-shaped plate protruding away from the partition plate.

6. The hot air assembly of the cooking appliance according to claim 4, characterized in that: Also includes: A guide plate, wherein the guide plate is fixed to the partition and is located on a side of the partition facing the wind hood, the guide plate is connected to the wind hood and cooperates with the wind hood to define a accommodating cavity, the centrifugal impeller is arranged in the accommodating cavity, and a surface of the guide plate on one side facing the wind hood is formed as a guide surface, and the guide surface is an arc surface that is recessed away from the wind hood.

7. The hot air assembly of the cooking appliance according to claim 6, characterized in that: The guide plate is an arc-shaped plate protruding toward the partition plate.

8. The hot air assembly of the cooking appliance according to any one of claims 1 to 3, characterized in that: The bottom plate has a mounting boss, the mounting boss is circular, and a plurality of blades are arranged radially outside the mounting boss and are evenly spaced along the circumference of the mounting boss.

9. The hot air assembly of the cooking appliance according to claim 8, characterized in that: The base plate also has: a connecting plate portion, which is connected to the circumferential edge of the mounting boss and extends radially outward along the mounting boss, and the connecting plate portion includes a plurality of connecting plates, and the plurality of connecting plates are arranged at intervals along the circumference of the mounting boss, and the plurality of connecting plates correspond one-to-one to the plurality of blades, and the blades are connected to one side edge of the corresponding connecting plate in the circumferential direction of the mounting boss.

10. The hot air assembly of the cooking appliance according to claim 9, characterized in that: The centrifugal impeller is integrally formed by stamping.

11. A cooking utensil, characterized in that: It comprises a hot air assembly according to any one of claims 1-10.

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