Air fryer

Abstract

The utility model belongs to the technical field of kitchen appliances, and particularly relates to an air fryer which comprises a machine body and a reflecting cover arranged in the machine body, a cooking cavity is formed below the reflecting cover, a fan is arranged in the reflecting cover and is a centrifugal fan, and a motor can drive the fan to rotate forwards and backwards. The reflecting cover comprises a cover top wall and a cover side wall extending downwards from the edge of the cover top wall, a steam exhaust port communicated with the outside is formed in the cover side wall, the length of the steam exhaust port is larger than the height of the steam exhaust port, and the steam exhaust port is provided with a first end and a second end which are sequentially arranged in the forward rotation direction of the motor. The first end of the steam exhaust port is the nearest position from the fan to the side wall of the cover body, so that a high-pressure area is formed at the first end, and the steam exhaust amount when the motor drives the fan to rotate reversely is larger than the steam exhaust amount when the motor drives the fan to rotate forwards. Two cooking modes of crisp roasting and tender roasting are realized, and the cooking taste is diversified.

Description

Technical Field

[0001] The utility model belongs to the technical field of kitchen appliances, and in particular relates to an air fryer. Background Art

[0002] A traditional air fryer generally includes a reflective cover arranged in the body, a cooking cavity is formed under the reflective cover, a fan and a heating tube are arranged in the reflective cover, and the reflective cover is a round or square reflective cover. The rotation of the fan drives the air flow in the cooking cavity to be discharged from the exhaust port on the side wall of the reflective cover. This is also a necessary measure to prevent the dangerous situation caused by excessive pressure in the cooking cavity.

[0003] As the fan rotates to discharge gas from the cooking cavity, the heat in the cooking cavity will be discharged along with the gas, causing heat loss in the cooking cavity, which is not conducive to maintaining the temperature of the cooking cavity. In order to solve the above problem, many technical solutions to reduce the amount of gas discharge have been proposed in the prior art.

[0004] For example, Chinese patent CN201720376613.4 proposes an air fryer that reduces heat loss, in which a connected inner air intake port and an inner air outlet are arranged on the side wall of an air guide cover (i.e., a reflector cover), and the accommodating cavity of the air guide cover is respectively provided with a first baffle and a second baffle at the inner air intake port and the inner air outlet, the first baffle, the second baffle and the inner air intake port and the inner air outlet together form an air exchange channel, the distance between one end of the first baffle close to the fan and the center of the fan is A, the distance between one end of the second baffle close to the fan and the center of the fan is B, wherein A<B, thereby achieving the effect of ensuring the pressure safety in the cooking cavity and reducing heat loss (i.e., reducing airflow discharge).

[0005] A similar prior art is Chinese patent CN202120870826.9, in which the heat insulation cover (reflection cover) is arranged in the shape of a volute, and the hot air outlet (exhaust port) is arranged at the outlet of the volute. Such a design can further enhance the flow effect of the airflow and achieve the purpose of reducing noise.

[0006] There are also some prior art air fryers, and their fan-related improvements are mainly to solve the problem of cooking uniformity. For example, in Chinese patent CN202122505431.1, the fan in its reflective cover is not used to exhaust the cooking cavity, but its function is to make the hot air in the pot body (cooking cavity) more evenly distributed, so that the ingredients obtain a more uniform heating effect. Its specific scheme is that the projection of the side wall of the air inlet on the horizontal plane is an involute based on the center of rotation of the fan, so as to maintain uniform airflow distribution, ensure that the hot air is evenly input into the food processing cavity, and maintain uniform heating of the ingredients. The side wall of the heating part and the side wall of the air inlet form a volute tongue at the starting point of the involute, and the fan is arranged closer to the volute tongue, so that the wind from the air inlet can smoothly enter the heating part, continuously generate hot air, avoid wind blockage, and make noise.

[0007] In summary, in the related art, by improving the structure of the reflector cover and reasonably arranging the position of the fan, the exhaust volume is reduced and the temperature in the cooking cavity is maintained and the temperature field is uniform when the fan rotates only in one direction.

[0008] Another example: Chinese patent CN202111273876.X discloses an air fryer with forward and reverse rotation functions, whose driving motor can generate airflows in two different directions in the cooking cavity by driving the axial flow fan blades in forward and reverse rotation, thereby constantly changing the air circulation direction in the food cooking cavity, so that the heating of each surface of the food is more even. However, the patent also mentioned that since axial flow fans usually cannot take into account the efficiency of forward and reverse rotation, the axial flow fan blades are relatively close to the reflective cover above, and it is difficult for the top of the fan to absorb air when the motor reverses. The airflow generated when the motor reverses is very small, and it is impossible to run in a single direction to achieve full cooking. Therefore, by making the forward rotation time of the hot air fan longer than the reverse rotation time, the more efficient forward rotation accounts for a higher proportion of the time in the cooking process, thereby increasing the air flow intensity in the air fryer.

[0009] It is understandable that current consumers are no longer satisfied with the requirements for the uniformity of the air fryer, and have an increasing demand for a variety of cooking tastes in the air fryer, and even have different tastes for the same food. For example, the applicant's Chinese patent CN202320431954.2 sets a first baking mode and a second baking mode for the air fryer. In the first baking mode, the cooking cavity is directly connected to the atmosphere, so that a larger amount of water vapor is discharged from the cooking cavity, so that the food is crispy and a crispy baking effect is achieved; in the second baking mode, the cooking cavity is indirectly connected to the atmosphere through an exhaust suppression device, and the exhaust suppression device is used to limit the discharge of water vapor in the cooking cavity, so as to maintain the moisture of the food and achieve a tender baking effect. However, due to the need to additionally set up an exhaust suppression device and control the way the cooking cavity is connected to the atmosphere, the overall structure is relatively complicated. Utility Model Content

[0010] The utility model provides an air fryer, which solves the problem in the prior art that the cooking ingredients of the air fryer have a single taste and cannot achieve two cooking modes of crispy baking and tender baking on the basis of simplifying the structure of the air fryer.

[0011] The technical solution adopted by the utility model is:

[0012] The utility model provides an air fryer, comprising a body and a reflective cover arranged in the body, a cooking cavity is formed below the reflective cover, a fan is arranged in the reflective cover, the fan is a centrifugal fan, a motor can drive the fan to rotate forward and reversely, the reflective cover comprises a cover top wall and a cover side wall extending downward from the edge of the cover top wall, a steam exhaust port connected to the outside is arranged on the cover side wall, the length of the steam exhaust port is greater than the height of the steam exhaust port, along the forward rotation direction of the motor, the steam exhaust port has a first end and a second end arranged in sequence, and the first end of the steam exhaust port is the closest point from the fan to the side wall of the cover body, so as to form a high-pressure area at the first end, so that the steam exhaust amount when the motor drives the fan to rotate reversely is greater than the steam exhaust amount when the motor drives the fan to rotate forwardly.

[0013] In the air fryer provided by the utility model, a motor capable of forward and reverse rotation is adopted, and along the forward rotation direction of the motor, the exhaust port opened in the reflective cover has a first end and a second end arranged in sequence, the first end of the exhaust port is the closest point from the fan to the side wall of the cover body, no matter which direction the fan rotates, the fan is closest to the first end, because an air flow channel is formed between the fan and the side wall of the reflective cover when the fan rotates, no matter which direction the fan rotates, the place with the highest air pressure in the air flow channel in the reflective cover is the closest point from the fan to the side wall of the reflective cover, that is, the first end, therefore, a relatively high pressure area relative to other areas in the reflective cover is formed at the first end.

[0014] Based on the characteristic of airflow flowing from high pressure to low pressure, when the fan rotates forward, due to the formation of a relatively high pressure area at the first end, the airflow can quickly pass through the exhaust port based on inertia, and continue to rotate in the reflector cover, thereby achieving the effect of reducing exhaust. If the fan is not located at the first end of the exhaust port at the closest position to the side wall of the cover, then when the fan rotates forward, the wind pressure and wind speed of the airflow in the airflow channel decrease during the process from the closest position to the first end of the exhaust port. Therefore, when the airflow reaches the first end of the exhaust port, the wind pressure and wind speed are relatively small, and the airflow is not easy to pass through the exhaust port and continue to remain in the reflector cover, but will be relatively easy to be discharged from the exhaust port, and the effect of reducing exhaust cannot be achieved. Therefore, when the motor rotates forward, under the positive driving action of the fan and the existence of the pressure difference on the left and right sides of the first end, the airflow passing through the exhaust port will circulate more along the airflow channel; since the cooking cavity is a closed cavity, the air suction effect from the bottom to the top of the centrifugal blades and the guidance of the side walls of the reflective cover, the airflow thrown out by the fan will flow along the side walls of the cooking cavity to the cooking cavity, and only a small amount will be discharged from the exhaust port. A large amount of water vapor is stored in the cooking cavity, thereby maintaining the moisture of the food, achieving a tender baking effect, and preparing food with high water requirements, such as chicken wings.

[0015] When the motor rotates in the opposite direction, the fan drives the airflow in the opposite direction. When the airflow passes through the exhaust port, it is difficult for the relatively low-pressure second end to directly pass through the exhaust port to the relatively high-pressure first end, which makes the airflow easily discharged from the exhaust port. Therefore, when the motor rotates in the opposite direction, the amount of water vapor discharged is increased compared to when the motor rotates forward, thereby making the food crispy and achieving a crispy roasting effect. It is suitable for food with low water demand, such as French fries.

[0016] In addition, by making the length of the exhaust port greater than the height of the exhaust port, when the motor reverses, more air can be driven to be discharged from the exhaust port, thereby further increasing the difference in exhaust volume in different modes and bringing about a difference in cooking taste. Therefore, when the motor is rotating forward and reverse, there is a large difference in the exhaust volume from the exhaust port, thereby achieving the two modes of tender baking and crisp baking and ensuring the difference in cooking taste in different modes. Compared with the traditional method of adding a micro-pressure valve, the overall structure of the air fryer is simplified, and users can choose a working mode that matches the type of ingredients to improve the cooking taste and diversify the cooking taste.

[0017] In a preferred embodiment, the reflector is in the shape of a volute, and the first end of the steam exhaust port forms a volute tongue.

[0018] By adopting a volute-shaped reflector cover, when the corresponding motor rotates forward, the hot air can flow more smoothly along the air flow channel. Under the action of the centrifugal fan, the air flow passing through the exhaust port will circulate more along the air flow channel, and the air flow thrown out by the fan will flow along the side wall of the cooking cavity to the cooking cavity, further increasing the water vapor stored in the cooking cavity. At the same time, it can increase the difference in water vapor in the cooking cavity when the motor rotates forward and reverse, thereby achieving a diversified cooking taste.

[0019] In a preferred embodiment, a deflector is provided on the outer side of the exhaust port, an exhaust channel is formed inside the deflector, and an air dividing plate is provided in the exhaust channel near the exhaust port, the air dividing plate divides the exhaust channel into multiple sub-channels, and the angle between the tangent of the hood side wall at the first end and the windward surface of the air dividing plate when the motor rotates forward is greater than or equal to 90°, and the angle between the tangent of the hood side wall at the second end and the windward surface of the air dividing plate when the motor rotates reversely is less than 90°.

[0020] By setting up a steam exhaust channel and an air distribution plate in the deflector, the angle of the air distribution plate is adjusted to coordinate the forward and reverse rotation of the motor to achieve a difference in exhaust volume, thereby ensuring the cooking effects of the two cooking modes. Specifically, when the motor rotates forward, the airflow reaches the first end first in the process of passing through the exhaust port, and the angle between the tangent of the hood side wall at the first end and the windward surface of the air distributor plate when the motor rotates forward is greater than or equal to 90°. That is, after the airflow hits the windward surface of the air distributor plate, it turns around and circulates into the air flow channel along the air distributor plate, but it is difficult to flow out of the exhaust channel along the air distributor plate. Therefore, the airflow circulates in the air flow channel and then flows to the cooking cavity along the side wall of the hood, and the airflow flowing out of the exhaust port is less; when the motor rotates reversely, the airflow originally flows from the second end to the first end in the process of passing through the exhaust port. Since the airflow reaches the second end first, the angle between the tangent of the hood side wall at the second end and the windward surface of the air distributor plate when the motor rotates reversely is less than 90°. Therefore, after the airflow hits the windward surface of the air distributor plate, it directly flows out of the exhaust channel along the windward surface of the air distributor plate under the drainage action of the air distributor plate, and the airflow through the exhaust port flows out, increasing the exhaust volume. In summary, through the setting of the air distribution plate, corresponding to the different states of forward rotation and reverse rotation of the motor, the air distribution plate plays the different roles of guiding the airflow to circulate into the air flow channel to avoid being discharged from the exhaust port and guiding the airflow to be discharged from the exhaust port, thereby increasing the difference between different cooking modes and realizing the diversification of cooking taste.

[0021] In a preferred embodiment, the air distributor plate extends from the inlet of the air guide cover to the outlet of the air guide cover.

[0022] Since the air divider plate extends from the entrance to the exit of the air guide cover, based on the wall effect of the air flow, when the motor rotates forward, the air flow circulates smoothly along the windward side of the air divider plate into the air flow channel, reducing water vapor loss. When the motor rotates reversely, the air flow is discharged to the exhaust channel along the air divider plate, thereby increasing the dehydration rate of the food. By extending the air divider plate, its diversion and guiding effects are enhanced, the difference in exhaust volume between the two modes is increased, and the taste of the food in each mode is improved.

[0023] In a preferred embodiment, the side wall of the cover includes an arc-shaped wall, the exhaust ports are formed at both ends of the arc-shaped wall, and the pipe wall of the deflector cover is tangent to the arc-shaped wall at the first end.

[0024] By setting the side wall of the cover as an arc-shaped wall and forming the exhaust port between the two ends of the arc-shaped wall, the air guide cover and the arc-shaped wall cooperate to form a volute shape. According to the wall effect of the air flow, the energy loss of the air flow when flowing on the inner side of the arc-shaped wall is reduced, so that a uniformly changing low-pressure area (the side close to the second end) and a high-pressure area (the side close to the first end) are formed in the air flow channel between the fan and the arc-shaped wall. The air flow is smooth and the loss is small. The pipe wall of the air guide cover is tangent to the arc-shaped wall at the first end. When the motor rotates forward, the air flow passing through the exhaust port will circulate more along the air flow channel. , a small amount is discharged from the exhaust port, thereby maintaining the moisture of the food and achieving a tender roasting effect; when the motor rotates in the opposite direction, the fan drives the airflow in the opposite direction. When the airflow passes through the exhaust port, it is difficult for the low-pressure second end to directly reach the high-pressure first end along the airflow channel. The airflow will be discharged from the exhaust port along the pipe wall of the guide cover. Since the pipe wall of the guide cover is tangent to the first end, the difficulty of air discharge is further reduced, thereby increasing the exhaust volume when the motor rotates in the opposite direction, achieving a crisp roasting effect, increasing the difference in exhaust volume caused by the forward and reverse rotation of the motor, and achieving diversified cooking taste.

[0025] In a preferred embodiment, the side wall of the cover includes an arcuate wall and a surrounding wall connected to both ends of the arcuate wall, the surrounding wall includes a tangent wall tangent to the arcuate wall at a first end and a bent wall connecting the tangent wall to the other end of the arcuate wall, and the exhaust port is located on the tangent wall.

[0026] Since some air fryers are configured to be not cylindrical but square, the side wall of the cover includes an arcuate wall and surrounding walls connected to both ends of the arcuate wall, which can be suitable for square or other shaped air fryers, so that the reflective cover is adapted to the shape of the pot body, thereby improving the sealing effect of the cooking cavity. On this basis, the exhaust port is set on the tangent wall, so that when the motor is reversed, it is difficult for the low-pressure second end to directly reach the high-pressure first end along the air flow channel. At the same time, under the auxiliary drainage effect of the tangent wall, the airflow will be more easily discharged from the exhaust port along the tangent wall, further reducing the difficulty of airflow discharge, thereby increasing the exhaust volume when the motor rotates in the opposite direction, achieving a crispy baking effect, increasing the difference in exhaust volume caused by the forward and reverse rotation of the motor, and achieving diversified cooking taste.

[0027] In a preferred embodiment, the distance difference between the fan and the first end and the second end is X, satisfying 5mm≤X≤30mm, or the angle formed by the center of the fan and the line connecting the first end and the second end is A, satisfying 10°≤A≤45°.

[0028] When the opening area of ​​the exhaust port is too large, on the one hand, when the motor rotates forward, although part of the airflow can circulate in the reflector due to inertia, due to the large exhaust port, some water vapor may be lost. On the other hand, when the motor rotates backward, although part of the airflow is discharged from the exhaust port along the first end, due to the large exhaust port, the airflow in the cooking cavity will be sucked from the position near the second end under the action of the centrifugal fan, which causes the difference in the exhaust volume at the exhaust port when the motor rotates forward and reverse, and the cooking taste of both modes is not good. Moreover, when the exhaust port area is too large, due to the constant pressure effect, the airflow blown out of the exhaust port will be sucked back, which still causes the problem of poor exhaust. Therefore, X≤30mm; or A≤45° are both to avoid the above problems caused by the exhaust port opening being too large.

[0029] When the opening area of ​​the exhaust port is too small, when the motor reverses, the ventilation volume of the exhaust port is limited. Even if there is a pressure difference between the first end and the second end to assist the airflow discharge, the discharge volume is still limited, and the exhaust volume is small, resulting in an insufficient difference in the exhaust volume at the exhaust port between the forward and reverse rotation of the motor. The cooking taste of both modes is not good, and there will be a large exhaust noise at the exhaust port. Therefore, 5mm≤X, or 10°≤A are both to avoid the above problems caused by the exhaust port opening being too small.

[0030] In summary, when 5mm≤X≤30mm, or 10°≤A≤45° is satisfied, the opening size of the exhaust port is relatively reasonable, achieving obvious exhaust difference between forward and reverse rotation of the motor, so that the taste of different processed ingredients can be improved in any mode.

[0031] In a preferred embodiment, the machine body includes a machine head and a machine base. The machine head can be flipped and installed above the machine base. The machine head includes a machine head body, a glass cover and a hollow connector connected between the machine head body and the glass cover. The reflective cover protrudes upward in the connector, and an exhaust port corresponding to the exhaust port is opened on the wall of the connector.

[0032] The machine head is installed on the top of the machine base in a flippable manner, which is convenient for operation. The machine head body, the glass cover and the hollow connector connected between the machine head body and the glass cover make the structure compact and the installation reliable. The reflective cover protrudes upward in the connector, and the internal space of the connector is reasonably utilized. An exhaust port corresponding to the steam exhaust port is opened on the wall of the connector to achieve smooth communication between the cooking chamber and the outside world.

[0033] The utility model also provides a control method for an air fryer, comprising the above-mentioned air fryer, the air fryer having a crispy baking mode and a tender baking mode, the cooking process of the air fryer comprising a temperature rising stage in which the heating tube continuously works and a constant temperature stage in which the heating tube intermittently works, in the crispy baking mode, during the constant temperature stage, the duration of the reverse rotation of the motor is greater than the duration of the forward rotation of the motor, and in the tender baking mode, during the constant temperature stage, the duration of the forward rotation of the motor is greater than the duration of the reverse rotation of the motor.

[0034] The control method of the air fryer provided by the utility model ensures that the temperature in the cooking cavity quickly reaches the preparation requirements during the heating stage when the heating tube is continuously working, improves the cooking efficiency, ensures that the food can be cooked and the cooking speed, and improves the heating uniformity of the food by controlling the intermittent operation of the heating tube to enter the constant temperature stage, prevents the food from being scorched, and improves the coloring effect and taste of the food. In the crispy baking mode, the duration of the reverse rotation of the motor in the constant temperature stage is longer than the duration of the forward rotation of the motor. Since the exhaust volume of the motor when the motor rotates forward is less than the exhaust volume of the motor when the motor rotates reversely, the water vapor of the food in the crispy baking mode is effectively discharged, the dehydration rate of the food is improved, the food is prevented from being wet and soft, and the prepared French fries are more delicious. In the tender baking mode, the duration of the forward rotation of the motor in the constant temperature stage is longer than the duration of the reverse rotation of the motor, thereby avoiding excessive water loss of the food, ensuring the water content of the food, and avoiding the food from being dry and woody, so that the prepared chicken wings are more tender.

[0035] In a preferred embodiment, in the crispy roasting mode and the tender roasting mode, the motor rotates in the forward direction during the heating stage.

[0036] By controlling the motor to rotate forward during the heating stage, the airflow discharged from the exhaust port during the heating stage is reduced, heat loss of the airflow is prevented, and the cooking cavity is quickly heated up to reach the temperature required for preparing food, further improving cooking efficiency.

[0037] In a preferred embodiment, in the crispy baking mode and the tender baking mode, after the heating tube stops working, the motor is controlled to rotate in the reverse direction for a preset time period.

[0038] After the air fryer is done cooking, the user may not be able to take out the food in time. Therefore, after the heating tube stops working, the motor is controlled to rotate in the reverse direction for a preset time, so that the remaining water vapor in the cooking chamber is discharged from the exhaust port to prevent the surface of the cooked food from being wetted by the water vapor again, thus improving the taste of the food. In addition, the remaining high-temperature water vapor in the cooking chamber is discharged to prevent the user from being scalded by the water vapor when opening the cooking chamber directly, which is safe to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0040] Figure 1 Schematic diagram of the cross-sectional structure of the air fryer in Examples 1, 2, and 7 of the present application;

[0041] Figure 2 It is a top view of the structure of the fan in Examples 1 and 7 of the present application;

[0042] Figure 3 It is a structural stereogram of the fan in Examples 1 and 7 of the present application;

[0043] Figure 4 It is a schematic diagram of the inverted structure of the fan in Examples 1 and 7 of the present application;

[0044] Figure 5 This is a schematic diagram of the airflow direction in the cooking cavity when the motor rotates forward in Example 1 of the present application;

[0045] Figure 6 This is a schematic diagram of the airflow direction in the cooking cavity when the motor rotates in the reverse direction in Example 1 of the present application;

[0046] Figure 7 Schematic diagram of the assembly position of the reflector and the fan in Examples 2 and 3 of the present application;

[0047] Figure 8 Schematic diagram of the airflow direction in the reflector when the motor rotates forward in Examples 2 and 3 of the present application;

[0048] Fig. 9 This is a schematic diagram of the airflow direction in the reflector when the motor rotates in the reverse direction in Examples 2 and 3 of the present application;

[0049] Fig.10a This is a three-dimensional schematic diagram of the assembly position of the reflector cover and the fan in Example 4 of the present application;

[0050] Fig.10b This is a schematic plan view of the assembly position of the reflector cover and the fan in Example 4 of the present application;

[0051] Fig.11 This is a schematic diagram of the airflow direction in the reflector when the motor rotates forward in Example 4 of the present application;

[0052] Fig.12 This is a schematic diagram of the airflow direction in the reflector when the motor rotates in the reverse direction in Example 4 of the present application;

[0053] Fig.13 This is a schematic diagram of the partial structure of the air fryer in Example 5 of the present application;

[0054] Fig.14 This is a top view of the structure of the air fryer in Example 5 of the present application;

[0055] Fig.15 This is a schematic diagram of the airflow direction in the reflector when the motor rotates forward in Example 5 of the present application;

[0056] Fig.16 This is a schematic diagram of the airflow direction in the reflective cover when the motor rotates in the reverse direction in Example 5 of the present application.

[0057] Explanation of the reference numerals: 10, machine body; 11, machine head; 12, machine base; 13, main body; 14, glass cover; 15, connector; 20, reflector; 21, mounting cavity; 22, cooking cavity; 201, main body; 202, first flange; 203, second flange; 30, motor; 40, fan; 41, centrifugal blade; 42, axial flow blade; 43, baffle; 44, substrate; 45, air outlet; 46, air flow channel; 50, heating tube; 60, exhaust port; 61, first end; 62, second end; 70, guide cover; 71, exhaust channel; 72, air distributor; 81, arc wall; 82, tangent wall; 83, bending wall. DETAILED DESCRIPTION

[0058] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0059] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment may be combined with each other without conflict.

[0060] In addition, in the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0061] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0062] Example 1

[0063] like Figure 1 As shown, this embodiment provides an air fryer, including a body 10 and a reflector 20 arranged in the body 10, the reflector 20 divides the internal space of the body 10 into an installation cavity 21 and a cooking cavity 22 located below the installation cavity 21, a motor 30 is arranged in the installation cavity 21, and a heating tube 50 and a fan 40 driven by the motor 30 are arranged in the cooking cavity 22, as shown in FIG. Figure 2 , 3 4, the fan 40 includes a centrifugal blade 41 and an axial flow blade 42 arranged radially outside the centrifugal blade 41. The centrifugal blade 41 drives the air flow to circulate upward from the center of the cooking cavity. The radial outer end of the axial flow blade 42 is the air outlet end. The reflector 20 is provided with an exhaust port 60 connected to the outside. Figure 5 As shown, the motor 30 rotates forward to drive the axial flow blades 42 to guide the flow downward, as shown in FIG. Figure 6 As shown, the reverse rotation of the motor 30 drives the axial flow blades 42 to guide the flow upward, the lower end of the exhaust port 60 is higher than the lower end of the axial flow blades 42, and the upper end of the exhaust port 60 is higher than the upper end of the axial flow blades 42, so that the exhaust volume when the motor 30 rotates forward is less than the exhaust volume when the motor 30 rotates reversely.

[0064] In the air fryer provided in this embodiment, a composite fan 40 having centrifugal blades 41 and axial flow blades 42 is used. Compared with the case where the centrifugal blades 41 are provided alone, the radial wind pressure is increased, the overall air volume of the fan 40 is increased, and the wind pressure is increased, so that a large amount of hot air can circulate in the cooking cavity 22, thereby improving the cooking efficiency. By adopting a motor 30 that can rotate forward and reverse, when the motor 30 rotates forward, the axial flow blades 42 are driven to divert the air downward, and when the motor 30 rotates reversely, the axial flow blades 42 are driven to divert the air upward. The reflector 20 is provided with a steam exhaust port 60 connected to the outside world. The steam exhaust port 60 is associated with the position of the axial flow blades 42, so that when the motor 30 is in the first state of forward rotation, the axial flow blades 42 divert the air downward so that a sufficient amount of hot air is transferred to the cooking cavity 22, thereby improving the cooking efficiency. The water vapor of the food floats up and is discharged from the steam exhaust port 60 due to the pressure difference between the upper and lower air pressures, and the water vapor is reduced in discharge speed by the downward pressure of the axial flow blades 42, thereby achieving the cooking cavity 22. The internal and external air pressures are balanced, which is safe to use and prevents excessive water vapor loss in the cooking chamber 22, thereby maintaining the moisture of the food, achieving a tender roasting effect, and preparing food that requires a lot of water, such as chicken wings; when the motor 30 is in the second state of reversal, the axial flow blades 42 drive the axial flow blades 42 to guide the flow upward. Therefore, the water vapor in the cooking chamber 22 not only floats up under the action of the upper and lower air pressure difference, but also is assisted by the axial flow blades 42. The propulsion effect allows a portion of the thrown airflow to be discharged upward from the exhaust port 60, which increases the amount of water vapor discharged compared to when the motor 30 is rotating forward, making the food crispy and achieving a crisp roasting effect. It is suitable for food that requires a small amount of water, such as French fries. Moreover, since the lower end of the steam exhaust port 60 is higher than the lower end of the axial flow blade 42, and the upper end of the steam exhaust port 60 is higher than the upper end of the axial flow blade 42, the position of the steam exhaust port 60 and the position of the axial flow blade 42 are arranged in the above-mentioned position association. When the motor 30 reverses, the axial flow blade 42 can assist more water vapor to be discharged from the steam exhaust port 60, thereby not only achieving diversified cooking of the taste of the ingredients, but also helping to ensure a more obvious difference in the exhaust volume when the motor 30 rotates forward and reversely, thereby ensuring that the ingredients have obvious taste differences in different cooking modes, and improving the taste of crispy roasting and tender roasting.

[0065] It can be understood that the positive rotation of the motor drives the axial flow blades to guide the air downward, which means that the rotation of the centrifugal fan creates a negative pressure in its central area, causing the air inside the cooking chamber to flow from bottom to top, and is heated by the heating tube to form a hot air flow, which is radially thrown out by the centrifugal fan, and then the air guide cover guides the hot air flow into the cooking chamber to heat the food.

[0066] Of course, since the fan 40 uses centrifugal blades 41 and axial flow blades 42, the centrifugal blades 41 rotate to form negative pressure in the center, and the air in the cooking cavity 22 flows from bottom to top. The hot air flow thrown out by the centrifugal blades 41 and the axial flow blades 42 will mainly circulate inside the cooking cavity 22 along the reflector 20 due to its own characteristics of flowing along the wall, baking the ingredients, and achieving rapid cooking of the ingredients. While exhausting steam smoothly, it ensures that the ingredients in different modes can be quickly cooked by air frying with sufficient hot air. Therefore, the fan 40 that uses a combination of centrifugal blades 41 and axial flow blades 42 is combined with the forward and reverse motor 30, and the position of the exhaust port 60 is associated with the position of the axial flow blades 42. It can achieve air frying in two modes: crispy baking and tender baking. Moreover, compared with the traditional method of adding a micro-pressure valve, the overall structure of the air fryer is simplified, and users can choose a working mode that matches it according to the type of ingredients to improve the cooking taste and diversify the cooking taste.

[0067] In this embodiment, if Figure 1 , 5 As shown in Figures 6 and 7, the reflector 20 includes a top wall and a side wall extending downward from the edge of the top wall, and a steam exhaust port 60 is provided on the side wall. The steam exhaust port 60 is located on the side of the axial flow blade 42, and the lower end of the steam exhaust port 60 is lower than the upper end of the axial flow blade 42. More specifically, the side wall of the cover is inclined relative to the vertical plane, and the difference between the inclination angle β between the axial flow blade 42 and the vertical plane and the inclination angle α between the side wall of the reflector 20 and the vertical plane is not greater than 10°.

[0068] By adopting a reflective hood 20 structure with a hood top wall and a hood side wall, it is beneficial to guide the hot air flow driven by the fan 40 to flow into the cooking chamber 22, reduce the wind pressure and heat loss of the fan 40, and improve the air frying efficiency. At the same time, the upper end of the steam exhaust port 60 is higher than the upper end of the axial flow blade 42, and the steam exhaust port 60 is opened on the hood side wall and the lower end of the steam exhaust port 60 is lower than the upper end of the axial flow blade 42, that is, the lower end of the steam exhaust port 60 is between the lower end and the upper end of the axial flow blade 42. Compared with the method in which the lower end of the steam exhaust port 60 is located above the upper end of the axial flow blade 42, it can ensure that the steam exhaust port 60 and the axial flow blade 42 have a certain overlapping height, thereby ensuring the exhaust volume when the motor 30 is reversed, increasing the difference in exhaust volume between the forward and reverse states of the motor 30, and improving the cooking taste in the two modes of crispy baking and tender baking. By making the difference between the inclination angle of the axial flow blade 42 relative to the vertical plane and the inclination angle of the reflective cover 20 no more than 10°, when the motor 30 is in the forward rotation process, the axial flow blade 42 assists the airflow to smoothly reach the side wall of the cover and then flows along the side wall of the cover to the cooking cavity 22, thereby reducing the loss of heat and wind pressure and ensuring the cooking efficiency; when the motor 30 is in the reverse rotation process, due to the small difference in the inclination angle with the reflective cover 20, when the axial flow blade 42 passes through the exhaust port 60, it can assist more water vapor to be discharged from the exhaust port 60, thereby improving the exhaust effect when the motor 30 is reversed, so that the exhaust volume of the motor 30 in the forward rotation and reverse rotation has a significant difference, thereby ensuring the cooking effect in both modes.

[0069] Of course, in other implementation examples, the exhaust port 60 is optionally provided on the top wall of the reflector 20. It is understandable that when the exhaust port 60 is located on the top wall of the reflector 20, the lower end and the upper end of the exhaust port 60 are located at the same height, both higher than the top of the axial flow blade 42.

[0070] It should be noted that the radial outer end of the axial flow blade 42 is the air outlet end, that is, the radial air outlet can be unblocked. For example, the radial outer end of the axial flow blade 42 is formed into a free end to constitute the air outlet end. Of course, in order to strengthen the overall structure of the fan 40, in this embodiment, as shown in FIG. Figure 2-4 As shown, the fan 40 also includes a baffle 43 arranged on the radial outside of the axial flow blade 42 and extending downward. The lower end of the axial flow blade 42 is lower than the lower end of the baffle 43 to form an air outlet end at the radial outer end. Preferably, the height of the baffle 43 is less than 1 / 2 of the height of the axial flow blade 42.

[0071] By setting a baffle 43 extending downward on the radial outer side of the axial flow blade 42, the overall strength of the fan 40 is improved and the service life of the fan 40 is extended. At the same time, since the lower end of the axial flow blade 42 is lower than the lower end of the baffle 43, an air outlet is formed at the radial outer end of the axial flow blade 42, so as to prevent the baffle 43 from hindering the air output of the axial flow blade 42. By setting the height of the baffle 43 to be less than 1 / 2 of the height of the axial flow blade 42, on the basis of improving the overall structural strength of the fan 40, the wind pressure loss of the air output of the fan 40 caused by the excessive height of the baffle 43 is prevented, and when the motor 30 is reversed, the air output of the axial flow blade 42 is ensured, and the radial outer end of the axial flow blade 42 is prevented from failing to discharge air, thereby achieving effective steam exhaust and achieving different cooking tastes.

[0072] In this embodiment, preferably, the radial length of the centrifugal blade 41 is greater than the radial length of the axial flow blade 42, so as to improve the cooking efficiency and the temperature uniformity in the cooking cavity 22, and ensure that the food in different modes can be quickly cooked by air frying with sufficient hot air while exhausting steam smoothly. In this embodiment, the axial flow blade 42 can be optionally arranged in one piece or in a separate piece at the radial outer end of the centrifugal blade 41.

[0073] Example 2

[0074] like Figure 1 As shown, this embodiment provides an air fryer, including a body 10 and a reflective cover 20 arranged in the body 10, the reflective cover 20 divides the internal space of the body 10 into an installation cavity 21 and a cooking cavity 22 located below the installation cavity 21, a motor 30 is arranged in the installation cavity 21, a fan 40 and a heating tube 50 are arranged in the reflective cover 20, the motor 30 can drive the fan to rotate forward and reverse, the reflective cover 20 includes a cover top wall and a cover side wall extending downward from the edge of the cover top wall, as shown in FIG. Figure 7 , Figure 8 , Fig. 9 As shown, a steam exhaust port 60 communicating with the outside is provided on the side wall of the cover. Along the positive rotation direction of the motor 30, the steam exhaust port 60 has a first end 61 and a second end 62 arranged in sequence. The first end of the steam exhaust port is the closest point from the fan to the side wall of the cover body, so as to form a high pressure area at the first end. In this embodiment, as shown in FIG. Figure 8 , 9As shown, the reflector is in the shape of a volute, and the first end of the exhaust port is a volute tongue. The distance S1 between the fan 40 and the first end 61 is the smallest, which is smaller than the distance between the fan 40 and other parts of the side wall of the cover. Preferably, the distance S1 between the fan 40 and the first end 61 is smaller than the distance S2 between the fan 40 and the second end 62, so that the air pressure at the first end 61 is greater than the air pressure in other areas of the reflector, so that the exhaust volume when the motor 30 rotates in the reverse direction is greater than the exhaust volume when the motor 30 rotates in the forward direction. It should be noted that the distance S1 between the fan 40 and the first end 61 refers to the distance from the center of the fan to the first end minus the length of the fan radius.

[0075] It should also be noted that the air fryer provided by the utility model can optionally be a head-flipping air fryer, and an air inlet is also provided on the head; or, the air fryer is a drawer-type air fryer, and the external air flow can achieve gas exchange through the matching gap between the pot body and the body, or by opening an air inlet on the upper part of the body.

[0076] Preferably, in this embodiment, the length of the exhaust port is greater than the height of the exhaust port. The length of the exhaust port is the minimum distance that the exhaust port extends along the direction of fan rotation, and the height of the exhaust port refers to the minimum distance that the exhaust port extends along the vertical direction. By making the length of the exhaust port greater than the height of the exhaust port, more airflow can be driven to be discharged from the exhaust port when the motor is reversed, thereby further increasing the difference in exhaust volume in different modes and bringing about a difference in cooking taste. When multiple exhaust ports are provided, the length and height of the exhaust port are both the total length and total height of the multiple exhaust ports.

[0077] In addition, in other implementations, the length of the exhaust port is equal to the height of the exhaust port, and in the process of drilling holes in the reflector, it is convenient to use regular tools for processing, which facilitates processing and mass production.

[0078] In the air fryer provided by the present application, a motor 30 capable of forward and reverse rotation is adopted, and along the forward rotation direction of the motor 30, the exhaust port 60 opened in the reflective cover 20 has a first end 61 and a second end 62 arranged in sequence, and the first end 61 of the exhaust port 60 is the closest point from the fan 40 to the side wall of the cover body. No matter which direction the fan 40 rotates, the fan 40 is closest to the first end 61. Since an air flow channel 46 is formed between the fan 40 and the side wall of the reflective cover 20 when the fan 40 rotates, no matter which direction the fan 40 rotates, the place with the highest air pressure in the air flow channel 46 in the reflective cover 20 is the closest point from the fan 40 to the side wall of the reflective cover 20, that is, the first end 61. Therefore, a relatively high-pressure area relative to other areas in the reflective cover 20 is formed at the first end 61.

[0079] Based on the characteristic of airflow flowing from high pressure to low pressure, when the fan 40 rotates forward, due to the formation of a relatively high pressure area at the first end 61, the airflow can quickly pass through the exhaust port 60 based on inertia, and continue to rotate in the reflector 20, thereby achieving the effect of reducing exhaust. If the closest position of the fan 40 to the side wall of the cover is not located at the first end 61 of the exhaust port 60, then when the fan 40 rotates forward, the wind pressure and wind speed of the airflow in the airflow channel 46 decrease during the process of reaching the first end 61 of the exhaust port 60 from the closest position. Therefore, when reaching the first end 61 of the exhaust port 60, the wind pressure and wind speed are relatively small, and the airflow is not easy to pass through the exhaust port 60 and continue to remain in the reflector 20, but will be relatively easy to be discharged from the exhaust port 60, and the effect of reducing exhaust cannot be achieved. Therefore, when the motor 30 rotates in the forward direction, under the positive driving action of the fan 40 and the existence of the pressure difference on the left and right sides of the first end 61, the airflow passing through the exhaust port 60 will circulate more along the airflow channel 46. Since the cooking cavity 22 is a closed cavity, the air suction effect from the centrifugal blades 41 from bottom to top and the guidance of the side walls of the reflective cover 20, the airflow thrown out by the fan 40 will flow along the side walls of the cooking cavity 22 to the cooking cavity 22, and only a small amount will be discharged from the exhaust port 60. A large amount of water vapor is stored in the cooking cavity 22, thereby maintaining the moisture of the food, achieving a tender baking effect, and preparing food with a large amount of water, such as chicken wings.

[0080] When the motor 30 rotates in the reverse direction, the fan 40 drives the airflow in the reverse direction. When the airflow passes through the exhaust port 60, it is difficult for the relatively low-pressure second end 62 to directly pass through the exhaust port 60 to reach the relatively high-pressure first end 61, which makes the airflow easily discharged from the exhaust port 60. Therefore, when the motor 30 rotates in the reverse direction, the amount of water vapor discharged is increased compared to when the motor 30 rotates forward, thereby achieving the crispness of the food and the crispy roasting effect, which is suitable for food with low water demand, such as French fries.

[0081] Therefore, when the motor 30 rotates forward and reverse, there is a large difference in the amount of steam exhausted from the exhaust port 60, thereby realizing the two modes of tender baking and crispy baking and ensuring the difference in cooking taste in different modes. Compared with the traditional method of adding a micro-pressure valve, the overall structure of the air fryer is simplified, and users can choose a working mode that matches the type of ingredients to improve the cooking taste and diversify the cooking taste.

[0082] When the opening area of ​​the steam outlet 60 is too large, on the one hand, when the motor 30 rotates forward, although a part of the airflow can circulate in the reflector 20 due to inertia, due to the large size of the steam outlet 60, some water vapor may be lost. On the other hand, when the motor 30 reverses, although a part of the airflow is discharged from the steam outlet 60 along the first end 61, due to the large size of the steam outlet 60, the airflow in the cooking cavity 22 will be sucked in from the position near the second end 62 under the action of the centrifugal fan 40, which makes the difference in the exhaust volume at the steam outlet 60 when the motor 30 rotates forward and reversely is not obvious enough, and the cooking taste of both modes is not good. Moreover, the area of ​​the steam outlet 60 is too large, and due to the constant pressure effect, the airflow blown out from the steam outlet 60 will be sucked back, which still causes the problem of poor exhaust.

[0083] Since when the opening area of ​​the steam exhaust port 60 is too small, when the motor 30 reverses, the ventilation volume of the steam exhaust port 60 is limited, even if there is a pressure difference between the first end 61 and the second end 62 to assist the airflow discharge, the discharge volume is still limited, and the steam discharge volume is small, resulting in an insufficient difference in the steam discharge volume at the steam exhaust port 60 between the forward and reverse rotations of the motor 30, poor cooking taste in both modes, and a large exhaust noise at the steam exhaust port 60. Therefore, 5mm≤X, or 10°≤A, are both to avoid the above problems caused by the steam exhaust port 60 being too small.

[0084] Therefore, in the present embodiment, preferably, the distance difference between the fan 40 and the first end 61 and the second end 62 is X, which satisfies 5mm≤X≤30mm. Preferably, the angle formed by the center of the fan 40 and the line connecting the first end 61 and the second end 62 is A, which satisfies 10°≤A≤45°. When 5mm≤X≤30mm is satisfied, such as X=5mm, 10mm, 15mm, 20mm or 25mm, or 10°≤A≤45°, such as A=20°, 30°, 40° or 45°, the opening size of the exhaust port 60 is more reasonable, and a significant exhaust difference between the forward and reverse rotation of the motor 30 is achieved, so that in any mode, the taste of different processed ingredients can be improved.

[0085] It should be noted that, combined with Figure 8As shown, in this embodiment, since the exhaust port 60 has a certain vertical height, the exhaust port 60 is an edge at the first end where the relatively high pressure area is formed, which refers to the inner end edge of the volute tongue of the volute; in this embodiment, the inner wall surface of the volute includes a main body 201 surrounding the fan and forming the first end and the second end, and a first rib 202 extending outward from the first end 61 and a second rib 203 extending outward from the second end 62, wherein the projection of the main body coincides with the involute based on the center of the fan. In this embodiment, the second rib 203 is tangent to the main body 201 and the vertical line where the tangent point is located forms the second end 61. Preferably, the first rib is parallel to the second rib, and an exhaust channel is formed between the first rib and the second rib.

[0086] Since the first end and the second end are not a point, the distance between the fan 40 and the first end 61 and the second end 62 refers to the distance from any point on the first end edge to the fan and the distance from any point on the second end line to the fan.

[0087] In this embodiment, the overall structure of the air fryer and the arrangement of the heating tube 50 are not limited. For example, in this embodiment, Figure 1 As shown, the machine body 10 includes a machine head 11 and a machine base 12, the machine head 11 is flippably installed above the machine base 12, the machine head 11 includes a machine head 11 body 13, a glass cover 14 and a hollow connector 15 connected between the machine head 11 body 13 and the glass cover 14, the reflector 20 is protruding upwardly in the connector 15, and an exhaust port corresponding to the exhaust port 60 is opened on the wall surface of the connector 15, and the exhaust port is opened at the rear end of the connector 15. The heating pipe 50 is coaxially arranged with the fan 40, and the heating pipe 50 surrounds the fan 40 to form a ring with an opening, and the opening is arranged close to the exhaust port 60.

[0088] By coaxially arranging the heating tube 50 and the fan 40, the suction of the negative pressure zone in the center of the fan 40 is more uniform, and the hot air thrown out is uniform, thereby improving the thermal uniformity in the cooking cavity 22 and ensuring the cooking efficiency. The opening of the heating tube 50 is arranged close to the exhaust port 60, and the opening is used to avoid the airflow flowing through the exhaust port 60 to achieve smooth discharge of the airflow. When the motor 30 rotates forward, the internal and external air pressures of the cooking cavity 22 are ensured to be stable. When the motor 30 rotates reversely, the water vapor is smoothly discharged. By reversibly installing the head 11 above the base 12, it is convenient for users to operate. The body 13 of the head 11, the glass cover 14 and the hollow connector 15 connected between the body 13 of the head 11 and the glass cover 14 make the structure compact and reliable to install. The reflector 20 is convexly arranged in the connector 15 upward, and the internal space of the connector 15 is reasonably utilized. An exhaust port corresponding to the exhaust port 60 is opened on the wall of the connector 15 to achieve smooth communication between the cooking cavity 22 and the outside. The exhaust port is located at the rear end of the connector 15, away from the user, to prevent the user from being scalded by the steam discharged from the exhaust port, thereby improving the safety of use. In addition, the exhaust port is arranged at the rear, so that the front end of the air fryer is flat and beautiful, and the user is prevented from taking food and causing food to fall into the exhaust port or powdered seasoning to fly into the exhaust port.

[0089] It should be noted that the fan 40 in this embodiment can be a centrifugal fan 40, that is, it includes centrifugal blades 41; or, the fan 40 is a composite fan 40, the fan 40 includes centrifugal blades 41 and axial flow blades 42 located at the radial outer end of the centrifugal blades 41, and the axial flow blades 42 can be optionally integrally connected to the centrifugal blades 41 or separately arranged.

[0090] Example 3

[0091] like Figure 7 , 8 As shown in Figure 9, this embodiment provides an air fryer. On the basis of Example 2, a deflector is provided on the outer side of the exhaust port, an exhaust channel is formed in the deflector, and an air dividing plate is provided in the exhaust channel near the exhaust port. The air dividing plate divides the exhaust channel into a plurality of sub-channels. The angle between the tangent of the hood side wall at the first end and the windward surface of the air dividing plate is greater than or equal to 90°, and the angle between the tangent of the hood side wall at the second end and the windward surface of the air dividing plate is less than 90°.

[0092] The side wall of the reflector 20 includes an arc wall. In this embodiment, the arc wall 81 can be an arc wall whose projection coincides with the involute based on the center of the fan; or the arc wall is an arc wall, and the circle corresponding to the arc wall coincides or does not coincide with the center of the fan. The exhaust port 60 is formed at both ends of the arc wall, and the pipe wall of the guide cover 70 is tangent to the arc wall at the first end 61.

[0093] By setting the side wall of the cover as an arc-shaped wall and forming the exhaust port 60 between the two ends of the arc-shaped wall, the air guide cover 70 cooperates with the arc-shaped wall to form a volute shape. According to the wall effect of the airflow, the energy loss of the airflow when flowing on the inner side of the arc-shaped wall is reduced, so that a uniformly changing low-pressure area P2 (on the side close to the second end 62) and a high-pressure area P1 (on the side close to the first end 61) are formed in the airflow channel between the fan 40 and the arc-shaped wall. The airflow flows smoothly with little loss. The pipe wall of the air guide cover 70 is tangent to the arc-shaped wall at the first end 61. When the motor 30 rotates forward, the airflow passing through the exhaust port 60 will circulate more along the airflow channel. A small amount is discharged from the exhaust port 60, so as to maintain the moisture of the food and achieve a tender roasting effect; when the motor 30 rotates in the opposite direction, the fan 40 drives the airflow in the opposite direction. When the airflow passes through the exhaust port 60, it is difficult for the low-pressure second end 62 to directly reach the high-pressure first end 61 along the air flow channel. The airflow will be discharged from the exhaust port 60 along the tube wall of the guide cover 70. Since the tube wall of the guide cover 70 is tangent to the first end 61, the difficulty of air discharge is further reduced. Therefore, when the motor 30 rotates in the opposite direction, the exhaust volume is increased to achieve a crispy roasting effect, increase the exhaust volume difference caused by the forward and reverse rotation of the motor 30, and achieve a diversified cooking taste.

[0094] Example 4

[0095] This embodiment provides an air fryer, which is different from the second embodiment in the shape of the reflector 20 and the arrangement position of the exhaust port 60.

[0096] like Fig.10a , 10b , Fig.11 , Fig.12 As shown, in this embodiment, the outer contour of the hood side wall is square, and the hood side wall includes an arcuate wall 81 and a surrounding wall connected to both ends of the arcuate wall 81, the surrounding wall includes a tangent wall 82 tangent to the arcuate wall at the first end 61 and a bending wall 83 connecting the tangent wall to the other end of the arcuate wall, and the exhaust port 60 is located on the tangent wall 82.

[0097] It should be noted that, in this embodiment, the first end refers to the first end edge where the tangent point between the inner wall surface of the arc wall and the tangent wall is located, and the second end is the second end edge of the exhaust port opposite to the first end edge.

[0098] More preferably, the reflector includes an exhaust passage connected to the outside of the exhaust port, and the intersection of the exhaust passage and the exhaust port forms a first end edge and a second end edge.

[0099] Since some air fryers are configured to be not cylindrical but square, the side wall of the cover includes an arcuate wall and surrounding walls connected to both ends of the arcuate wall, which can be suitable for square or other shaped air fryers, so that the reflective cover 20 is adapted to the shape of the pot body, thereby improving the sealing effect of the cooking cavity 22. On this basis, the exhaust port 60 is arranged on the tangent wall, so that when the motor 30 is reversed, it is difficult for the low-pressure second end 62 to directly reach the high-pressure first end 61 along the air flow channel. At the same time, under the auxiliary drainage effect of the tangent wall, the airflow will be more easily discharged from the exhaust port 60 along the tangent wall, further reducing the difficulty of airflow discharge, thereby increasing the exhaust volume when the motor 30 rotates in the opposite direction, achieving a crispy baking effect, increasing the exhaust volume difference caused by the forward and reverse rotation of the motor 30, and achieving a diversified cooking taste.

[0100] It should be noted that, in this embodiment, the arc wall 81 can be selected as an arc wall whose projection coincides with the involute based on the center of the fan; or the arc wall is an arc wall, and optionally, the circle corresponding to the arc wall coincides or does not coincide with the center of the fan; or the arc wall is formed by multiple non-concentric arc segments.

[0101] Example 5

[0102] This embodiment provides an air fryer. Fig.13 , Fig.14 , Fig.15 , 16 As shown, a deflector 70 is provided on the outside of the exhaust port 60, and an exhaust channel 71 is formed in the deflector 70. An air dividing plate 72 is provided in the exhaust channel 71 near the exhaust port 60, and the air dividing plate 72 divides the exhaust channel 71 into a plurality of sub-channels. The angle b between the tangent N of the cover side wall at the first end 61 and the windward surface M of the air dividing plate 72 when the motor rotates forward is greater than or equal to 90°, and the angle c between the tangent P of the cover side wall at the second end 62 and the windward surface Q of the air dividing plate 72 when the motor rotates reversely is less than 90°. Of course, most preferably, the angle c between the tangent P of the cover side wall at the second end 62 and the windward surface Q of the air dividing plate 72 is 0, that is, the air dividing plate extends in a direction tangent to the second end 62.

[0103] It can be understood that, in this embodiment, the first end of the steam exhaust port extends toward the fan to form a protrusion, so that the distance between the first end of the steam exhaust port and the fan is minimized.

[0104] In a preferred embodiment, the air distribution plate 72 extends from the inlet of the air guide cover 70 to the outlet of the air guide cover 70. Fig.15 , 16 As shown, since the air deflector has a turning portion, an extension plate that follows the shape of the air deflector is provided at the outlet end of the air deflector 70 , and the extension plate is bent relative to the air deflector.

[0105] By providing an exhaust passage 71 and an air distributor 72 in the air deflector 70, the difference in exhaust volume is achieved by adjusting the angle of the air distributor 72 to coordinate with the forward and reverse rotation of the motor 30, thereby ensuring the cooking effects of the two cooking modes. Specifically, when the motor 30 rotates in the forward direction, the airflow first reaches the first end 61 in the process of passing through the exhaust port 60, and the angle between the tangent of the cover side wall at the first end 61 and the windward surface M of the air distributor 72 is greater than or equal to 90°, that is, the airflow hits the windward surface M of the air distributor 72 and then turns around, circulates along the air distributor 72 into the airflow passage, and is difficult to flow out of the exhaust passage 71 along the air distributor 72. Therefore, the airflow circulates in the airflow passage and then flows along the cover side wall to the cooking cavity 22, and the air flowing out from the exhaust port 60 is The airflow is small; when the motor 30 rotates in the reverse direction, the airflow flows from the second end 62 to the first end 61 in the process of passing through the exhaust port 60. Since the airflow reaches the second end 62 first, the angle between the tangent of the cover side wall at the second end 62 and the windward surface Q of the air dividing plate 72 is less than 90°. Therefore, after the airflow hits the windward surface Q of the air dividing plate 72, it flows out of the exhaust channel 71 along the windward surface Q of the air dividing plate 72 under the drainage effect of the air dividing plate 72, and flows out through the airflow of the exhaust port 60, thereby increasing the exhaust volume. In summary, through the setting of the air dividing plate 72, when the motor 30 rotates forward and reverse, the air dividing plate 72 plays the role of guiding the airflow to circulate into the airflow channel to avoid being discharged from the exhaust port 60 and guiding the airflow to be discharged from the exhaust port 60, respectively, thereby increasing the difference between different cooking modes and achieving the diversification of cooking tastes.

[0106] In the present embodiment, since the air divider plate 72 extends from the entrance to the exit of the air guide cover 70, based on the wall effect of the air flow, when the motor 30 rotates forward, the air flow circulates smoothly along the windward surface M of the air divider plate 72 into the air flow channel, thereby reducing water vapor loss. When the motor 30 rotates reversely, the air flow is discharged toward the exhaust channel 71 along the air divider plate 72, thereby increasing the dehydration rate of the food. By extending the air divider plate 72, its diversion and guiding effects are enhanced, thereby increasing the difference in exhaust volume between the two modes and improving the taste of the food in each mode.

[0107] Example 6

[0108] This embodiment provides a control method for an air fryer. Taking the air fryer provided in Embodiment 1 as an example, the air fryer has a crispy baking mode and a tender baking mode. The cooking process of the air fryer includes a temperature rise stage in which the heating tube 50 works continuously and a constant temperature stage in which the heating tube 50 works intermittently. In the temperature rise stage, the motor 30 is controlled to rotate forward. In the crispy baking mode, the duration of the motor 30 rotating in the reverse direction in the constant temperature stage is longer than the duration of the motor 30 rotating forward. In the tender baking mode, the duration of the motor 30 rotating forward in the constant temperature stage is longer than the duration of the motor 30 rotating in the reverse direction. Preferably, after the heating tube 50 stops working, the motor 30 is controlled to rotate in the reverse direction for a preset time.

[0109] The control method of the air fryer provided in the present application ensures that the temperature in the cooking cavity 22 quickly reaches the preparation requirements during the heating stage when the heating tube 50 is continuously working, improves the cooking efficiency, ensures that the food can be cooked and the cooking speed, and controls the heating tube 50 to work intermittently to enter the constant temperature stage, thereby improving the uniformity of the heating of the food, preventing the food from being burnt, and improving the coloring effect and taste of the food. In the crispy baking mode, the duration of the reverse rotation of the motor 30 in the constant temperature stage is greater than the duration of the forward rotation of the motor 30. Since the exhaust volume of the motor 30 when the motor 30 rotates forward is less than the exhaust volume of the motor 30 when the motor 30 rotates reversely, the water vapor of the food in the crispy baking mode is effectively discharged, the dehydration rate of the food is improved, the food is prevented from being wet and soft, and the prepared French fries are more delicious. In the tender baking mode, the duration of the forward rotation of the motor 30 in the constant temperature stage is greater than the duration of the reverse rotation of the motor 30, thereby avoiding excessive water loss of the food, ensuring the water content of the food, and avoiding the food from being dry and firewood, and the prepared chicken wings are more tender. By controlling the motor 30 to rotate forward during the heating stage, the airflow discharged from the exhaust port 60 during the heating stage is reduced, the heat loss of the airflow is prevented, and the temperature in the cooking cavity 22 is quickly increased to reach the temperature required for preparing food, further improving the cooking efficiency. Since the user may not be able to take out the ingredients in time after the air fryer is finished cooking, the motor 30 is controlled to rotate in the reverse direction for a preset time after the heating tube 50 stops working, so that the residual water vapor in the cooking cavity 22 is discharged from the exhaust port 60, preventing the surface of the cooked food from being wetted by the water vapor again, thereby improving the taste of the food. In addition, the residual high-temperature water vapor in the cooking cavity 22 is discharged to prevent the user from being scalded by the water vapor when directly opening the cooking cavity 22, which is safe to use.

[0110] Of course, it should be noted that, in another implementation example, during the heating stage, the motor 30 is optionally controlled to stop working and only the heating tube 50 is working, or the motor 30 rotates in the reverse direction.

[0111] Example 7

[0112] like Figure 1-4 As shown, this embodiment provides an air fryer, and the fan 40 of the air fryer is optimized. The air fryer includes a body 10 and a reflective cover 20 arranged in the body 10, the reflective cover 20 divides the internal space of the body 10 into an installation cavity 21 and a cooking cavity 22, a motor 30 is arranged in the installation cavity 21, a heating tube 50 and a fan 40 driven by the motor 30 are arranged in the cooking cavity 22, the fan 40 includes a base plate 44 connected to the rotating shaft of the motor 30 and extending horizontally, and blades extending from the base plate to the cooking cavity 22, the blades include centrifugal blades 41 vertically arranged on the base plate and extending outwardly, and axial flow blades 42 arranged on the base plate and inclined relative to the vertical plane, and the axial flow blades 42 are connected to the radial outer ends of the centrifugal blades 41 and extend outwardly.

[0113] The present application provides an air fryer, wherein the fan 40 of the air fryer comprises a base plate, a centrifugal blade 41 and an axial flow blade 42 to form a composite fan 40. Since the base plate extends horizontally and the centrifugal blade 41 is perpendicular to the base plate, during rotation, the centrifugal blade 41 throws hot air radially outward, and the axial flow blade 42 is arranged on the base plate and connected to the radial outer end of the centrifugal blade 41. Therefore, air volume loss caused by ventilation gaps between the centrifugal blade 41 and the axial flow blade 42 and between the axial flow blade 42 and the base plate is prevented. The centrifugal blade 41 forms a negative pressure at the center, so that the airflow flows from bottom to top, is thrown out radially, and then flows downward to the cooking cavity 22, providing a hot air circulation up and down in the closed cooking cavity 22. The hot air radially thrown out by the centrifugal blades 41 will change the direction of the hot air under the guidance of the base plate and the axial flow blades 42, and realize axial flow with a larger wind pressure to prevent the hot air thrown out by the centrifugal blades 41 from directly hitting the reflector 20 and causing loss of wind pressure and heat. Therefore, the cooperation of the axial flow blades 42, the centrifugal blades 41 and the base plate not only increases the radial wind pressure compared with the single centrifugal blade 41, but also increases the air volume thrown from the centrifugal blades 41 to the axial flow blades 42, reduces the loss of wind speed and temperature caused by the air volume loss, increases the overall air output of the fan 40, increases the wind pressure, and enables a large amount of hot air to circulate in the cooking cavity 22, thereby improving the cooking efficiency.

[0114] In this embodiment, the roots of the centrifugal blades 41 and the roots of the axial flow blades 42 are both connected to the substrate and are located on the same straight line. Of course, it should be noted that the straight line where the roots of the centrifugal blades 41 and the axial flow blades 42 are located preferably passes through the center of the fan 40. Of course, it can actually be a straight line that deviates from the center of the fan 40.

[0115] During the rotation of the fan 40, the centrifugal blades 41 rotate to form a negative pressure at the center, and the air in the cooking chamber 22 flows from bottom to top and is thrown out in a straight line through the centrifugal blades 41. Therefore, the roots of the centrifugal blades 41 and the axial flow blades 42 are located on the same straight line, so that the air volume thrown out by the centrifugal blades 41 can reach the axial flow blades 42 more smoothly according to its original direction with its inertia and flow along the axial flow blades 42. Therefore, the air volume thrown from the centrifugal blades 41 to the axial flow blades 42 is ensured, and the air volume loss caused by the change in the hot air flow direction is prevented, thereby further improving the air output of the fan 40.

[0116] More preferably, if Figure 2-4 As shown, the motor 30 is capable of rotating forward and reverse. When the motor 30 rotates forward, the blades have a first air outlet surface. When the motor 30 rotates reversely, the blades have a second air outlet surface. The substrate 44 includes a plurality of sub-substrates that are arranged at intervals along the circumference of the fan 40 and extend horizontally. An air outlet 45 is formed between adjacent sub-substrates. The sub-substrates are adjacent to the first air outlet surface, and the air outlet 45 is adjacent to the second air outlet surface.

[0117] The substrate includes a plurality of sub-substrates arranged at intervals along the circumference of the fan 40 and extending horizontally, and air outlets are formed between adjacent sub-substrates. In the process of manufacturing the fan 40, the substrate can be directly used as a raw material for stamping and forming, thereby simplifying the manufacturing process of the fan 40 and reducing costs. Since the sub-substrates are adjacent to the first air outlet surface and the air outlet is adjacent to the second air outlet surface, when the motor 30 rotates forward, the first air outlet surface and the substrate cooperate with each other, so that the airflow is sucked in from bottom to top and then radially thrown out along the substrate, thereby realizing hot air circulation in the cooking cavity 22, improving heating efficiency, and avoiding hot air loss. When the motor 30 rotates reversely, the air outlet is adjacent to the second air outlet surface, and the air outlet avoids the airflow driven by the axial flow blades 42, so that the axial flow blades 42 assist the airflow to be discharged from the exhaust port 60, thereby taking away the water vapor in the cooking cavity 22, further enhancing the exhaust volume when the motor 30 rotates reversely, so that the exhaust volume when the motor 30 rotates forward is less than the exhaust volume when the motor 30 rotates reversely, and the taste of the cooked food is diversified, realizing two cooking modes of crispy roasting and tender roasting.

[0118] Preferably, if Figure 2 As shown, the radial distance between the radial outer end of the centrifugal blade 41 and the center of the fan 40 is L1, and the radial distance between the radial outer end of the axial flow blade 42 and the center of the fan 40 is L2, which satisfies: 0.4≤L1 / L2≤0.75. The angle between the axial flow blade 42 and the vertical plane is α, which satisfies 15°≤α≤45°.

[0119] By setting the radial lengths of the centrifugal blades 41 and the axial flow blades 42 within the above ratio range, it is possible to avoid the problem that the outer diameter of the centrifugal blades 41 is too small, resulting in insufficient centrifugal force, small central negative pressure and low hot air circulation efficiency in the cooking cavity 22. The overall assembly space of the fan 40 first causes the radial size to be limited. If the outer diameter of the centrifugal blades 41 is too large, the outer diameter of the axial flow blades 42 will be too small, and its downward axial force will be too small, resulting in the problem that the effect of downward pressure and diversion to the cooking cavity 22 is not good. Therefore, if 0.4≤L1 / L2≤0.75 is satisfied, under the installation environment where the installation space of the fan 40 is reasonably used, the fan 40 provides sufficient power for the airflow circulation in the cooking cavity 22, and at the same time, the axial flow blades 42 of the fan 40 are used to press down to assist the airflow flow, reduce the wind pressure and heat loss caused by the airflow colliding with the reflector 20, and achieve an overall improvement in the hot air circulation efficiency.

[0120] By setting the inclination angle between the axial flow blades 42 and the vertical plane at 15°-45°, the inclination angle of the axial flow blades 42 is avoided to be too small (less than 15°) or too large (greater than 45°), resulting in the problem that the overall centrifugal force of the fan 40 is too large, the downward pressure is too small, and the effect of the fan 40 on guiding the airflow downward is not significantly improved. When the inclination angle between the axial flow blades 42 and the vertical plane meets the requirement of 15°-45°, the axial flow blades 42 can effectively guide the hot air thrown out by the centrifugal blades 41 downward into the cooking cavity 22, thereby reducing the loss caused by the hot air being directly thrown out radially and hitting the reflector 20, thereby increasing the air volume and air pressure blown to the cooking cavity 22 by the fan 40, and improving the cooking efficiency.

[0121] In one embodiment, the heating tube 50 is coiled around the center of the reflector 20 for multiple turns, and the projection of the heating tube 50 on the horizontal plane overlaps with the projection of the centrifugal blades 41 and the axial flow blades 42. The heating tube 50 is arranged around the center of the reflector 20 for multiple turns, thereby increasing the heat dissipation area, and the projection of the heating tube 50 on the horizontal plane overlaps with the projection of the centrifugal blades 41 and the axial flow blades 42, so that the cold air sucked up by the centrifugal blades 41 is fully heated in multiple directions, increasing the amount and pressure of the hot air thrown out, and the horizontal overlap of the heating tube 50 and the axial flow blades 42 can heat the axial airflow driven by the axial flow blades 42, thereby increasing the temperature rise rate in the cooking cavity 22 and improving the cooking efficiency.

[0122] In combination with the air fryer and the control method of the air fryer provided in the present application, when using the air fryer, the user can, according to the type of ingredients, for example, for ingredients such as chicken wings and popcorn chicken, select the tender baking mode to lock in the moisture of the ingredients to achieve a fresh and tender taste of the ingredients; for ingredients that need to be dehydrated, such as French fries, select the crisp baking mode to drain excess water from the ingredients to achieve a dry and crisp taste of the ingredients, greatly improving the user experience.

[0123] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0124] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0125] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An air fryer, comprising a body, a reflector and a motor arranged in the body, a cooking cavity is formed below the reflector, a fan is arranged in the reflector, and the fan is a centrifugal fan. It is characterized in that The motor can drive the fan to rotate forward and reversely. The reflective cover includes a cover top wall and a cover side wall extending downward from the edge of the cover top wall. The cover side wall is provided with an exhaust port connected to the outside world. The length of the exhaust port is greater than the height of the exhaust port. Along the forward rotation direction of the motor, the exhaust port has a first end and a second end arranged in sequence, and the first end of the exhaust port is the closest point from the fan to the side wall of the cover body, so as to form a high-pressure area at the first end, so that the exhaust volume when the motor drives the fan to rotate reversely is greater than the exhaust volume when the motor drives the fan to rotate forward.

2. An air fryer according to claim 1, It is characterized in that The reflector is in the shape of a volute, and the first end of the exhaust port forms a volute tongue.

3. An air fryer according to claim 1, It is characterized in that A deflector is arranged on the outer side of the exhaust port, and a steam exhaust channel is formed in the deflector. An air dividing plate is arranged in the exhaust channel near the exhaust port, and the air dividing plate divides the exhaust channel into a plurality of sub-channels. The angle between the tangent of the hood side wall at the first end and the windward surface of the air dividing plate is greater than or equal to 90°, and the angle between the tangent of the hood side wall at the second end and the windward surface of the air dividing plate is less than 90°.

4. An air fryer according to claim 3, It is characterized in that The air distribution plate extends from the inlet of the air deflector to the outlet of the air deflector.

5. An air fryer according to claim 3 or 4, It is characterized in that The cover side wall comprises an arc-shaped wall, the exhaust port is formed at two ends of the arc-shaped wall, and the pipe wall of the deflector cover is tangent to the arc-shaped wall at the first end.

6. An air fryer according to claim 1, It is characterized in that A deflector is arranged outside the exhaust port, a steam exhaust passage is formed inside the deflector, an air distribution plate is arranged in the exhaust passage near the exhaust port, and the air distribution plate extends from the inlet of the deflector to the outlet of the deflector.

7. An air fryer according to claim 1, It is characterized in that The cover side wall includes an arcuate wall and a surrounding wall connected to both ends of the arcuate wall, the surrounding wall includes a tangent wall tangent to the arcuate wall at the first end and a bent wall connecting the tangent wall to the other end of the arcuate wall, and the exhaust port is located on the tangent wall.

8. An air fryer according to claim 1, It is characterized in that A distance difference between the fan and the first end and the second end is X, which satisfies 5 mm ≤ X ≤ 30 mm.

9. The air fryer according to claim 1, It is characterized in that An angle A formed by the center of the fan and a line connecting the first end and the second end satisfies 10°≤A≤45°.

10. An air fryer according to claim 1, It is characterized in that The machine body includes a machine head and a machine base. The machine head can be flipped and installed above the machine base. The machine head includes a machine head body, a glass cover and a hollow connector connected between the machine head body and the glass cover. The reflective cover protrudes upward inside the connector. An exhaust port corresponding to the exhaust port is opened on the wall of the connector.

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