Fan and cooking apparatus

Abstract

The application relates to a fan and a cooking device, the fan comprising a back plate, a movable fan blade and a linkage assembly; the movable fan blade is rotatably connected to the back plate around a rotation axis parallel to the radial direction of the back plate; the linkage assembly is used for driving the movable fan blade to rotate; the linkage assembly comprises a moving piece slidably connected to the back plate; the sliding path of the moving piece comprises an initial position and a sliding position arranged along the radial direction of the back plate; the moving piece is configured to have a centrifugal force when the back plate rotates, the centrifugal force has a tendency to drive the moving piece to move from the initial position to the sliding position, and when the moving piece moves from the initial position to the sliding position, the moving piece drives the movable fan blade to rotate so that the included angle between the movable fan blade and the back plate increases. The above scheme meets the requirements of large air volume at high speed and small air volume at low speed, so that better cooking effect can be obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical appliances, in particular to a fan and a cooking device. BACKGROUND

[0002] Taking a steam oven as an example, a cooking device with a baking function usually has a hot air baffle with an air inlet and an air outlet arranged at the rear side of an inner container, and the hot air baffle and a back plate of the inner container enclose a hot air chamber. A hot air fan with a back heating pipe arranged around the periphery of a fan blade is installed in the hot air chamber, so that when the cooking device is working, the hot air in the inner container and the hot air chamber can be circulated. Specifically, the air in the inner container is sucked into the hot air chamber through the air inlet on the hot air baffle, and the hot air heated by the back heating pipe flows back to the inner container through the air outlet of the hot air baffle under the centrifugal force of the fan blade, for baking the food in the inner container, thereby realizing the hot air circulation between the inner container and the hot air chamber, improving the baking uniformity and baking efficiency.

[0003] In the case of a fixed fan blade speed, the area of the low pressure area in the center of the fan blade is constant, and the flow rate of the air flow around the fan blade is also constant, thereby making the air flow rate between the hot air chamber and the inner container constant. However, for an oven applying a double-speed hot air fan, the existing fan cannot meet the requirement of different air volume at different speeds, which affects the cooking effect of the cooking device. SUMMARY

[0004] Therefore, it is necessary to provide a fan and a cooking device to solve the problem that the existing fan cannot meet the air volume adjustment requirement.

[0005] A fan, comprising a back plate, a movable fan blade and a linkage assembly; the back plate is rotatably arranged about its own axis; the movable fan blade is arranged radially along the back plate and is rotatably connected to the back plate about a rotation axis parallel to the radial direction of the back plate; the linkage assembly is used to drive the movable fan blade to rotate, and the linkage assembly comprises a moving part slidably connected to the back plate, a sliding path of the moving part comprising an initial position and a sliding position arranged radially along the back plate, and the moving part is configured to have a centrifugal force when the back plate rotates, which has a tendency to drive the moving part to move from the initial position to the sliding position, and when the moving part moves from the initial position to the sliding position, it drives the movable fan blade to rotate to increase the included angle between the movable fan blade and the back plate.

[0006] In one of the embodiments, the linkage assembly comprises a telescopic block, the telescopic block comprises a support part capable of at least partially protruding from the end surface of the back plate connected to the movable blade, and the support part is located within the projection of the movable blade in the axial direction of the back plate, and the support part protrudes from the end surface of the back plate connected to the movable blade with the length increasing when the moving part moves from the initial position to the sliding position.

[0007] In one of the embodiments, the telescopic block is connected to the back plate and is capable of moving in the axial direction of the back plate, the telescopic block further comprises a force receiving part located on the moving path of the moving part, the force receiving part is connected to the support part, and the support part passes through the back plate to partially protrude from the back plate, the moving part and the force receiving part are located on the side of the back plate away from the movable blade, and the end surface of the force receiving part towards the moving part is a first guide surface with upward slope.

[0008] In one of the embodiments, the end surface of the moving part towards the telescopic block is a second guide surface arranged in parallel with the first guide surface.

[0009] In one of the embodiments, the linkage assembly comprises a first elastic member, the first elastic member is located between the force receiving part and the end surface of the back plate away from the movable blade, and the first elastic member has a tendency to move the force receiving part in the direction away from the back plate.

[0010] In one of the embodiments, the linkage assembly further comprises a second elastic member, two ends of the second elastic member are connected to the movable blade and the support part respectively, when the moving part is located at the sliding position, the length of the support part protruding from the back plate is the longest, at this time the second elastic member has a tendency to move the movable blade away from the support part.

[0011] In one of the embodiments, the back plate comprises a stop block protruding from the end surface of the back plate connected to the movable blade, the stop block is located on the rotation path of the movable blade, and when the movable blade abuts against the stop block, the movable blade is perpendicular to the back plate.

[0012] In one of the embodiments, the linkage assembly comprises a third elastic member, the third elastic member is connected to the moving part, and the third elastic member has a tendency to move the moving part in the radial direction towards the axis of the back plate.

[0013] In one of the embodiments, the fan further comprises a fixed blade, the fixed blade is connected to the end surface of the back plate connected to the movable blade, and is arranged in the radial direction of the back plate, the fixed blade and the back plate are arranged at an angle.

[0014] In one embodiment, the movable blades and the fixed blades are staggered along the circumference of the back plate.

[0015] In one embodiment, the movable fan blade includes a fixed plate and a movable plate, the fixed plate is rotatably connected to the back plate, the radial length of the movable plate along the back plate is greater than the radial length of the fixed plate along the back plate, and the movable plate can slide relative to the fixed plate along the radial direction of the back plate.

[0016] In one embodiment, the back plate further includes an edge block protruding from the end face of the back plate connected to the movable fan blade, the edge block is located at the circumferential edge of the back plate and is located in the same radial direction as the movable sheet, the edge block is provided with an arc groove, and the end of the movable sheet away from the axis of the back plate is passed through and slidably connected to the arc groove.

[0017] In one embodiment, the fan further includes a fourth elastic member, both ends of which are respectively connected to the movable piece and the edge block, and has a tendency to drive the movable piece to move radially toward the axis of the back plate.

[0018] In one embodiment, the fan further includes a rotating member rotatably connected to the back plate, the rotating member rotates coaxially with the back plate, the end of the rotating member close to the movable plate is an abutting end, the distance between the abutting end and the rotation axis of the rotating member is not less than the minimum distance between the movable plate and the axis of the back plate, and when the rotating member rotates, the abutting end intermittently abuts against the movable plate to drive the movable plate to slide relative to the fixed plate.

[0019] In one embodiment, when the abutting end abuts against the movable piece, an end of the movable piece away from the axis of the back plate protrudes from the fixed piece.

[0020] In one embodiment, the end surface of the abutting end facing the movable piece has an arc-shaped structure.

[0021] A cooking device includes a fan as described in any of the above embodiments, and also includes an inner pot with a hollow interior and a baffle arranged in the inner pot, wherein the baffle divides the space inside the inner pot into a connected hot air chamber and a cooking cavity, and the fan is located in the hot air chamber and is arranged toward the cooking cavity.

[0022] The fan provided in the above scheme, by setting the rotatable movable fan blade and the linkage assembly affected by the centrifugal force, when the centrifugal force drives the moving piece to move, the included angle between the movable fan blade and the back plate changes, the movable fan blade can be controlled to open at high speed of the fan, and the movable fan blade closes at low speed, and within a certain range, the faster the speed of the back plate, the larger the included angle between the movable fan blade and the back plate, and the larger the included angle between the movable fan blade and the back plate, the larger the air volume of the fan, thereby meeting the large air volume required at high speed and the small air volume required at low speed, so as to obtain better cooking effect. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a cross-sectional view of a cooking device of the fan in an embodiment of the present application.

[0024] Figure 2 It is Figure 1 a schematic view of part of the structure of the fan Figure 1 .

[0025] Figure 3 It is Figure 2 a schematic view of part of the structure of the fan Figure 2 .

[0026] Figure 4 It is Figure 1 a schematic view of part of the structure of the fan Figure 3 .

[0027] BRIEF DESCRIPTION OF DRAWINGS:

[0028] 10, cooking device; 100, fan; 110, back plate; 111, stop block; 112, edge block; 1121, arc-shaped groove; 113, sliding rail; 120, movable fan blade; 121, fixed piece; 122, movable piece; 130, linkage assembly; 131, moving piece; 1311, second guide surface; 132, expansion block; 1321, support part; 1322, force receiving part; 13221, first guide surface; 140, first elastic member; 150, fixed fan blade; 160, fourth elastic member; 170, rotating piece; 171, abutting end; 172, rotating end; 180, mounting plate; 190, through hole; 200, inner container; 210, hot air chamber; 220, cooking cavity; 300, baffle. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship 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, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, if there are terms such as "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] It is to be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein only mean for the purpose of illustration and are not meant to be limiting.

[0035] Referring to Figure 1 , Figure 1 A cross-sectional structural schematic diagram of a cooking apparatus 10 in an embodiment of the present application is shown. In an embodiment of the present application, a cooking apparatus 10 is provided, which can be a steam oven, an oven, etc., but is not limited thereto. As shown in Figure 1 , the cooking apparatus 10 comprises a fan 100 as in any of the embodiments described below, further comprises an inner container 200 which is hollow inside and a baffle 300 which is arranged in the inner container 200, the baffle 300 divides the space in the inner container 200 into a hot air chamber 210 and a cooking cavity 220 which are in communication, the baffle 300 is provided with an air inlet and an air outlet to realize the communication between the hot air chamber 210 and the cooking cavity 220. The cooking cavity 220 is used to place and cook food materials, the hot air chamber 210 is used to exchange hot air with the cooking cavity 220, and the fan 100 is arranged in the hot air chamber 210 and faces the cooking cavity 220, so that the hot air generated in the hot air chamber 210 can be blown into the cooking cavity 220, thereby improving the baking uniformity and baking efficiency.

[0036] In combination with Figure 2 , a partial structural schematic diagram of a fan 100 in an embodiment of the present application is shown. In an embodiment of the present application, a fan 100 is provided, which can be applied to the cooking apparatus 10 as shown in Figure 2 , and can also be applied to other fields. Figure 1

[0037] As shown in Figure 2 , the fan 100 comprises a back plate 110, movable fan blades 120 and a linkage assembly 130. It can be understood that the fan 100 further comprises a rotating shaft for driving the back plate 110 to rotate and a driving member for driving the rotating shaft to rotate, and the structure thereof is not limited, which can be any existing driving member and rotating shaft in any structure or material.

[0038] As shown in Figure 2 ​As shown, the movable fan blades 120 are arranged along the radial direction of the back plate 110 and are rotatably connected to the back plate 110 along the rotation axis parallel to the radial direction of the back plate 110. The movable fan blades 120 are rotated so that the included angle between the movable fan blades 120 and the back plate 110 is adjustable, and thus the inclination angle of the fan blades and the height protruding from the back plate 110 are adjustable, thereby achieving the adjustment of the air volume of the fan 100.

[0039] As shown in the drawings, Figure 2 In one embodiment, the fan 100 further comprises fixed fan blades 150 connected to the end surface of the back plate 110 where the movable fan blades 120 are connected. The fixed fan blades 150 and the movable fan blades 120 are located on the same end surface of the back plate 110, and the fixed fan blades 150 are also arranged along the radial direction of the back plate 110. The included angle between the fixed fan blades 150 and the back plate 110 is fixed, and the fixed fan blades 150 and the back plate 110 are arranged at an angle so that when the included angle between the movable fan blades 120 and the back plate 110 is the smallest, the fixed fan blades 150 can push the air flow when the back plate 110 rotates.

[0040] In the present embodiment, as shown in the drawings, Figure 2 The movable fan blades 120 and the fixed fan blades 150 are both multiple and equal in number. In one embodiment, the movable fan blades 120 and the fixed fan blades 150 are staggered along the circumferential direction of the back plate 110 so that when the back plate 110 rotates in the fan 100, the generated gas flow velocity is uniform. The number of movable fan blades 120 and fixed fan blades 150 is not limited, and in other embodiments, the distribution of movable fan blades 120 and fixed fan blades 150 is respectively central symmetric with the axis of the back plate 110 as the center.

[0041] As shown in the drawings, Figure 2 and Figure 3 The linkage assembly 130 is used to drive the rotation of the movable fan blades 120 to adjust the included angle between the movable fan blades 120 and the back plate 110, thereby adjusting the air volume of the fan 100. It can be understood that each movable fan blade 120 is provided with a linkage assembly 130 to independently adjust the movable fan blade 120.

[0042] As shown in the drawings, Figure 3 The linkage assembly 130 comprises a moving part 131 slidably connected to the back plate 110, as shown in the drawings, Figure 3 The back plate 110 is provided with a sliding track 113 for limiting the sliding direction of the moving part 131. The sliding track 113 is arranged along the radial direction of the back plate 110 so that the sliding path of the moving part 131 comprises an initial position and a sliding position arranged along the radial direction of the back plate 110. In order to facilitate the illustration, Figure 3In the embodiment, the two opposite moving members 131 are located at the initial position, and the other two opposite moving members 131 are located at the sliding position. In actual application, the moving members 131 connected to the back plate 110 should be located at the same position.

[0043] As shown in Figure 3 , the moving member 131 is configured to have a centrifugal force when the back plate 110 rotates, which has a tendency to drive the moving member 131 to move from the initial position to the sliding position. It can be understood that the centrifugal force of the moving member 131 will increase with the increase of the rotating speed of the back plate 110, and the moving member 131 needs to overcome the friction force and the like when moving relative to the back plate 110. When the centrifugal force of the back plate 110 at the rotating speed is sufficient to overcome the friction force, the moving member 131 will start to move towards the sliding position.

[0044] In one embodiment, the linkage assembly 130 includes a third elastic member (not shown) connected to the moving member 131, and the third elastic member has a tendency to drive the moving member 131 to move along the radial direction towards the axis of the back plate 110. Exemplarily, the third elastic member can be a spring, a spring rope or the like. When the rotating speed of the back plate 110 is different, the centrifugal force of the moving member 131 is also different, and the moving member 131 needs to overcome the elastic force of the third elastic member and the friction force between the moving member 131 and the back plate 110 when moving on its moving path. Therefore, when the rotating speed of the back plate 110 is fast, the centrifugal force can overcome more elastic force of the third elastic member, that is, the moving member 131 is closer to the sliding position, and when the rotating speed of the back plate 110 is slow, the centrifugal force can only drive the moving member 131 to move a small distance, and at this time, the moving member 131 is closer to the initial position. As can be seen, the rotating speed of the back plate 110 corresponding to the start of the movement of the moving member 131 can be adjusted by adjusting the elastic force of the third elastic member.

[0045] As shown in Figure 2 and Figure 3 , the moving member 131 moves from the initial position to the sliding position to drive the movable fan blade 120 to rotate to increase the included angle between the movable fan blade 120 and the back plate 110, so that within a certain range, the faster the rotating speed of the back plate 110, the larger the included angle between the movable fan blade 120 and the back plate 110, and the larger the included angle between the movable fan blade 120 and the back plate 110, the larger the air volume of the fan 100, thereby realizing the effect that the faster the rotating speed, the larger the air volume.

[0046] As shown in Figure 2 and Figure 3As shown in the figure, in one of the embodiments, the linkage assembly 130 comprises a telescopic block 132, the telescopic block 132 comprises a support part 1321 capable of at least partially protruding from the end surface of the back plate 110 connected with the movable leaf 120, and the support part 1321 is located within the projection of the movable leaf 120 on the axial direction of the back plate 110, when the moving part 131 moves from the initial position to the sliding position, the length of the support part 1321 protruding from the end surface of the back plate 110 connected with the movable leaf 120 increases, so as to push the movable leaf 120 away from the back plate 110 by the length increase of the support part 1321, and realize the rotation of the movable leaf 120 relative to the back plate 110 to increase the angle.

[0047] As shown in the figure, Figure 3 In one of the embodiments, the telescopic block 132 is connected with the back plate 110 and capable of moving on the axial direction of the back plate 110, the telescopic block 132 further comprises a force receiving part 1322 located on the moving path of the moving part 131, the force receiving part 1322 is connected with the support part 1321, and the support part 1321 passes through the back plate 110 to partially protrude from the back plate 110, the moving part 131 and the force receiving part 1322 are located on the side of the back plate 110 away from the movable leaf 120, and the end surface of the force receiving part 1322 towards the moving part 131 is a first guide surface 13221 inclined with an upward slope, so as to facilitate the conversion of the radial abutting force between the moving part 131 and the telescopic block 132 into the force capable of driving the telescopic block 132 to move relative to the back plate 110 on the axial direction of the back plate 110, thereby realizing the length increase of the support part 1321 protruding from the end surface of the back plate 110 connected with the movable leaf 120 when the moving part 131 moves from the initial position to the sliding position.

[0048] As shown in the figure, Figure 3 In one of the embodiments, the end surface of the moving part 131 towards the telescopic block 132 is a second guide surface 1311 arranged in parallel with the first guide surface 13221, so as to facilitate the conversion of the radial abutting force between the moving part 131 and the telescopic block 132 into the force capable of driving the telescopic block 132 to move relative to the back plate 110 on the axial direction of the back plate 110.

[0049] As shown in the figure, Figure 2 and Figure 3 As shown in the figure, the back plate 110 is provided with a through hole 190, the end surface of the back plate 110 away from the movable leaf 120 is connected with a mounting plate 180, the mounting plate 180 is annular in structure and coaxially arranged with the back plate 110, and the moving part 131 and the telescopic block 132 are both connected with the mounting plate 180, so as to facilitate the production and processing.

[0050] As shown in the figure, Figure 3As shown, in one embodiment, the linkage assembly 130 includes a first elastic member 140, which is located between the force-bearing portion 1322 and the end face of the back plate 110 away from the movable fan blade 120, and the first elastic member 140 has a tendency to drive the force-bearing portion 1322 to move in a direction away from the back plate 110, so that when the movable member 131 is reset to the initial position, the length of the support portion 1321 protruding from the end face of the back plate 110 connecting the movable fan blade 120 is shortened, thereby reducing the angle between the movable fan blade 120 and the back plate 110, thereby achieving the effect of smaller air volume as the speed decreases.

[0051] In one of the embodiments, linkage assembly 130 also includes a second elastic member (not shown), and illustratively, the second elastic member can be a spring, elastic cord, etc. The two ends of the second elastic member are connected to movable blade 120 and support portion 1321 respectively. When movable member 131 is positioned at the sliding position, the length of support portion 1321 protruding from back plate 110 is the longest. Now, the second elastic member has the trend of driving movable blade 120 away from support portion 1321, so as to utilize the elastic force of the second elastic member to drive movable blade 120 to continue to rotate, and then continue to increase the angle between movable blade 120 and back plate 110. Preferably, when movable member 131 is positioned at the initial position, the length of support portion 1321 protruding from back plate 110 is the shortest. Now, the second elastic member has the trend of driving movable blade 120 near support portion 1321, so as to utilize the elastic force of the second elastic member to drive movable blade 120 to rotate, and avoid the state of movable blade 120 maintaining a larger angle between itself and back plate 110 after shortening support portion 1321.

[0052] like Figure 2 As shown, in one embodiment, the back panel 110 includes a stopper 111 protruding from the end face of the back panel 110 connected to the movable fan blade 120. The stopper 111 is located on the rotation path of the movable fan blade 120, and when the movable fan blade 120 abuts against the stopper 111, the movable fan blade 120 is perpendicular to the back panel 110. At this time, the movable fan blade 120 can drive the most airflow, thereby achieving a faster rotation speed and a greater air volume.

[0053] In the above scheme, by setting a rotatable movable fan blade 120 and a linkage component 130 affected by centrifugal force, when the centrifugal force drives the movable part 131 to move, the angle between the movable fan blade 120 and the back plate 110 changes accordingly, and the movable fan blade 120 can be controlled to open when the fan 100 rotates at a high speed, and the movable fan blade 120 can be closed when the fan 100 rotates at a low speed. Within a certain range, the faster the rotation speed of the back plate 110, the larger the angle between the movable fan blade 120 and the back plate 110, and the larger the angle between the movable fan blade 120 and the back plate 110, the greater the air volume of the fan 100, thereby meeting the large air volume required at high speed and the small air volume required at low speed, so as to obtain a better cooking effect.

[0054] As shown in Figure 2 and Figure 4 In one embodiment, the movable vane 120 includes a fixed blade 121 and a movable blade 122, the fixed blade 121 is rotationally connected to the back plate 110, and the movable blade 122 rotates synchronously with the fixed blade 121. The length of the movable blade 122 along the radial direction of the back plate 110 is greater than the length of the fixed blade 121 along the radial direction of the back plate 110, and the movable blade 122 can slide relative to the fixed blade 121 along the radial direction of the back plate 110 to adjust the length of the movable vane 120 as a whole by the length of the movable blade 122 protruding from the fixed blade 121 along the radial direction of the back plate 110, so as to dynamically adjust the diameter of the movable vane 120, thereby adjusting the airflow velocity in the multi-layer baking mode.

[0055] As shown in Figure 2 and Figure 4 In one embodiment, the back plate 110 further includes an edge block 112 protruding from the end surface of the back plate 110 connected to the movable vane 120, the edge block 112 is located at the circumferential edge of the back plate 110 and is in the same radial direction as the movable blade 122, and the edge block 112 is provided with an arc-shaped slot 1121, and one end of the movable blade 122 away from the axis of the back plate 110 is threaded and slidingly connected in the arc-shaped slot 1121, so that when the movable blade 122 rotates synchronously with the fixed blade 121, the movable blade 122 rotates along the arc-shaped slot 1121, and when the movable blade 122 slides relative to the fixed blade 121, the movable blade 122 is threaded in the arc-shaped slot 1121, so as to limit the rotation and sliding of the movable blade 122 along the radial direction of the back plate 110 by the arc-shaped slot 1121.

[0056] As shown in Figure 2 and Figure 4 In one embodiment, the fan 100 further includes a fourth elastic member 160, both ends of the fourth elastic member 160 are connected to the movable blade 122 and the edge block 112, respectively, and have a tendency to move the movable blade 122 along the radial direction towards the axis of the back plate 110, so that as shown in Figure 4 When the movable blade 122 is not subjected to force from objects other than the fourth elastic member 160, the movable blade 122 remains in a position close to the axis of the back plate 110, and when the movable blade 122 is abutted by the following rotating member 170, the movable blade 122 slides relative to the fixed blade 121.

[0057] As shown in Figure 4As shown, in one of the embodiments, the fan 100 further comprises a rotating member 170 rotatably connected to the back plate 110, the rotating member 170 rotates coaxially with the back plate 110, one end of the rotating member 170 close to the movable piece 122 is an abutting end 171, the rotating member 170 further comprises a rotating end 172 connected to the abutting end 171 and used to drive the abutting end 171 to rotate, the rotating end 172 is coaxially arranged with the back plate 110 and is independently driven to rotate. The distance between the abutting end 171 and the rotating axis of the rotating member 170 is not less than the minimum distance between the movable piece 122 and the axis of the back plate 110, so that when the rotating member 170 rotates, the abutting end 171 intermittently abuts against the movable piece 122 to drive the movable piece 122 to slide relative to the fixed piece 121, the rotating member 170 abuts against each movable piece 122 respectively every time it rotates one circle, so that the movable piece 122 is periodically abutted by the abutting end 171, the length of the movable piece 122 protruding radially from the fixed piece 121 along the back plate 110 is periodically adjusted, the length of the whole active fan blade 120 is periodically adjusted, the diameter of the active fan blade 120 is periodically and dynamically adjusted, and the airflow speed is adjusted in the multi-layer baking mode.

[0058] It can be understood that since the length of the movable piece 122 is greater than the length of the fixed piece 121, when the movable piece 122 moves relative to the fixed piece 121, there is always a part protruding from the fixed piece 121, and in the fan 100, the closer to the axis of the back plate 110, the closer to the negative pressure area, so when the end of the movable piece 122 protruding from the fixed piece 121 close to the axis of the back plate 110, the airflow adjustment effect is very small. As shown, Figure 4 As shown, in one of the embodiments, when the abutting end 171 abuts against the movable piece 122, the end of the movable piece 122 away from the axis of the back plate 110 protrudes from the fixed piece 121, so that the length of the end of the movable piece 122 protruding from the fixed piece 121 away from the axis of the back plate 110 is periodically adjusted due to the rotation of the rotating member 170, the length of the whole active fan blade 120 is periodically adjusted, the diameter of the active fan blade 120 is periodically and dynamically adjusted, and the airflow speed is adjusted in the multi-layer baking mode.

[0059] In one of the embodiments, the end face of the abutting end 171 towards the movable piece 122 is arc-shaped, so that when the rotating member 170 rotates, the abutting end 171 can more easily push the movable piece 122 to move along the radial direction outward.

[0060] In the above scheme, by arranging the movable piece 122 which can slide along the radial direction relative to the fixed piece 121, the length of the whole active fan blade 120 is adjusted by the length of the movable piece 122 protruding radially from the fixed piece 121 along the back plate 110, the diameter of the active fan blade 120 is dynamically adjusted, the airflow speed of the inner container 200 is adjusted, the problem of uneven temperature field of different layers during multi-layer baking is improved, and the baking effect of multi-layer baking is improved.

[0061] Each technical feature of the above-described embodiments can be combined with any other technical feature, and for the sake of brevity, not all possible combinations are described, but it is understood that the scope of the present disclosure encompasses all such possible combinations.

[0062] The above-described embodiments are merely illustrative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be understood as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A fan, characterized in that: The fan comprises: The back plate is rotatably arranged around its own axis; movable fan blades, arranged along the radial direction of the back plate and rotatably connected to the back plate around a rotation axis parallel to the radial direction of the back plate; and a linkage assembly for driving the movable fan blade to rotate, the linkage assembly comprising a moving member slidably connected to the back plate, the sliding path of the moving member comprising an initial position and a sliding position arranged radially along the back plate, the moving member being configured such that when the back plate rotates, the centrifugal force exerted on the moving member has a tendency to drive the moving member to move from the initial position toward the sliding position, and when the moving member moves from the initial position toward the sliding position, it drives the movable fan blade to rotate so as to increase the angle between the movable fan blade and the back plate; The linkage assembly includes a telescopic block, which includes a support portion that can at least partially protrude from the end surface of the back plate connected to the movable fan blade. When the movable member moves from the initial position toward the sliding position, it drives the support portion to protrude from the end surface of the back plate connected to the movable fan blade to increase the length, so as to push the movable fan blade away from the back plate.

2. The fan according to claim 1, characterized in that The supporting portion is located within the projection of the movable fan blade in the axial direction of the back plate.

3. The fan according to claim 2, characterized in that: The telescopic block is connected to the back plate and can move in the axial direction of the back plate. The telescopic block also includes a force-bearing portion located on the moving path of the moving member. The force-bearing portion is connected to the supporting portion, and the supporting portion passes through the back plate to partially protrude from the back plate. The moving member and the force-bearing portion are both located on the side of the back plate away from the movable fan blade, and the end face of the force-bearing portion toward the moving member is a first guide surface inclined at an upward slope.

4. The fan according to claim 3, characterized in that The end surface of the moving member facing the telescopic block is a second guide surface arranged parallel to the first guide surface.

5. The fan according to claim 3, characterized in that: The linkage assembly includes a first elastic member, which is located between the force-bearing portion and the end surface of the back plate facing away from the movable fan blade, and the first elastic member has a tendency to drive the force-bearing portion to move in a direction away from the back plate.

6. The fan according to claim 2, characterized in that The linkage assembly also includes a second elastic member, the two ends of which are respectively connected to the movable fan blade and the support part. When the movable member is in the sliding position, the length of the support part protruding from the back plate is the longest. At this time, the second elastic member has a tendency to drive the movable fan blade away from the support part.

7. The fan according to claim 6, characterized in that The back plate includes a stopper protruding from the end surface of the back plate connected to the movable fan blade, the stopper is located on the rotation path of the movable fan blade, and when the movable fan blade abuts against the stopper, the movable fan blade is perpendicular to the back plate.

8. The fan according to claim 1, characterized in that The linkage assembly includes a third elastic member connected to the moving member, and the third elastic member has a tendency to drive the moving member to move radially toward the axis of the back plate.

9. The fan according to claim 1, characterized in that The fan further includes fixed blades, which are connected to the end surface of the back plate connected to the movable blades and are arranged along the radial direction of the back plate. The fixed blades and the back plate are arranged at an angle.

10. The fan according to claim 9, characterized in that The movable blades and the fixed blades are staggeredly distributed along the circumference of the back plate.

11. The fan according to claim 1, characterized in that The movable fan blade includes a fixed plate and a movable plate, the fixed plate is rotatably connected to the back plate, the radial length of the movable plate along the back plate is greater than the radial length of the fixed plate along the back plate, and the movable plate can slide relative to the fixed plate along the radial direction of the back plate.

12. The fan according to claim 11, characterized in that The back plate also includes an edge block protruding from the end face of the back plate connected to the movable fan blade. The edge block is located at the circumferential edge of the back plate and is located in the same radial direction as the movable piece. The edge block is provided with an arc groove, and the end of the movable piece away from the axis of the back plate is passed through and slidably connected to the arc groove.

13. The fan according to claim 12, characterized in that The fan further includes a fourth elastic member, both ends of which are respectively connected to the movable piece and the edge block, and has a tendency to drive the movable piece to move radially toward the axis of the back plate.

14. The fan according to claim 13, characterized in that The fan also includes a rotating part rotatably connected to the backplate, the rotating part rotates coaxially with the backplate, the end of the rotating part close to the movable plate is an abutment end, the distance between the abutment end and the rotation axis of the rotating part is not less than the minimum distance between the axis of the movable plate and the backplate, and when the rotating part rotates, the abutment end intermittently abuts against the movable plate to drive the movable plate to slide relative to the fixed plate.

15. The fan according to claim 14, characterized in that When the abutting end abuts against the movable piece, one end of the movable piece away from the axis of the back plate protrudes from the fixed piece.

16. The fan according to claim 14, characterized in that The end surface of the abutting end facing the movable piece is in an arc-shaped structure.

17. A cooking device, characterized in that: It includes a fan as described in any one of claims 1-16, and also includes an inner pot with a hollow interior and a baffle arranged in the inner pot, the baffle divides the space in the inner pot into a connected hot air chamber and a cooking cavity, and the fan is located in the hot air chamber and is arranged toward the cooking cavity.

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