Fan and cooking equipment

Abstract

The utility model relates to a draught fan and cooking equipment. The draught fan comprises a back plate and movable fan blades. The back plate can rotate around the axis of the back plate. The movable fan blades are arranged in the radial direction of the back plate and comprise fixed pieces and movable pieces, the length of the movable pieces in the radial direction of the back plate is larger than that of the fixed pieces in the radial direction of the back plate, and the movable pieces can slide relative to the fixed pieces in the radial direction of the back plate. According to the scheme, the movable piece capable of sliding relative to the fixed piece in the radial direction is arranged, the overall length of the movable fan blades can be adjusted through the length, protruding out of the fixed piece in the radial direction of the back plate, of the movable piece, the diameter of the movable fan blades is dynamically adjusted, the liner air flow speed is adjusted, and the problem that temperature fields of different layers are not uniform during multi-layer baking is solved; and the baking effect of multi-layer baking is improved.

Description

Technical Field

[0001] This application relates to the technical field of electrical appliances, and particularly to fans and cooking appliances. Background Art

[0002] Taking a steam oven as an example, a cooking appliance with a baking function usually has a hot air baffle with an air inlet and an air outlet at the rear side of the inner cavity. The hot air baffle and the back plate of the inner cavity enclose a hot air chamber. A hot air blower with a fan blade and surrounded by a back heating pipe is installed in the hot air chamber, so that when the cooking appliance works, the hot air in the inner cavity and the hot air chamber can convect. Specifically, the air in the inner cavity 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 into the inner cavity through the air outlet of the hot air baffle under the action of the centrifugal force of the fan blade, for baking the food in the inner cavity, thereby realizing the hot air convection between the inner cavity and the hot air chamber, improving the baking uniformity and the baking efficiency.

[0003] However, in the existing cooking appliances, the air outlet, air inlet, rotational speed of the hot air blower, and the fan blade of the hot air baffle are all fixed, resulting in uneven temperature fields in different layers of the inner cavity during the baking process, and thus a large temperature difference in each area of the inner cavity, affecting the coloring of the baked food and the uniformity of the maturity, especially when baking multiple layers, affecting the baking effect and reducing the user experience. Summary of the Utility Model

[0004] Based on this, in view of the problem of uneven temperature fields in each layer of the existing cooking appliances, it is necessary to provide a fan and a cooking appliance.

[0005] A fan, the fan includes a back plate and a movable fan blade; the back plate is rotatably arranged around its own axis; the movable fan blade is arranged along the radial direction of the back plate, and the movable fan blade includes a fixed piece and a movable piece, the length of the movable piece along the radial direction of the back plate is greater than the length of the fixed piece along the radial direction of the back plate, and the movable piece can slide relative to the fixed piece along the radial direction of the back plate.

[0006] In one embodiment, the back plate further includes an edge block protruding from the end face of the back plate connecting the movable fan blade, and the back plate and the movable piece are located on the same radial and at one end of the movable piece away from the axis of the back plate. The fan further includes a fourth elastic member, and two ends of the fourth elastic member are respectively connected to the movable piece and the edge block, and has a tendency to drive the movable piece to move along the radial direction towards the axis of the back plate.

[0007] In one embodiment, the edge block is located at the circular edge of the back plate.

[0008] In one embodiment, the blower further includes a rotating member rotatably connected to the back plate. The rotating member rotates coaxially with the back plate. One end of the rotating member close to the movable piece 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 piece and the axis of the back plate. When the rotating member rotates, the abutting end intermittently abuts the movable piece to drive the movable piece to slide relative to the fixed piece.

[0009] In one embodiment, when the abutting end abuts the movable piece, one end of the movable piece away from the axis of the back plate protrudes from the fixed piece.

[0010] In one embodiment, the end face of the abutting end facing the movable piece has an arc-shaped structure.

[0011] In one embodiment, the fixed piece is rotatably connected to the back plate about a rotation axis parallel to the radial direction of the back plate.

[0012] In one embodiment, the blower further includes a fixed fan blade. The fixed fan blade is connected to the end face of the back plate connecting the movable fan blade and is arranged along the radial direction of the back plate. The fixed fan blade and the back plate are arranged at an angle.

[0013] In one embodiment, the movable fan blades and the fixed fan blades are alternately distributed along the circumferential direction of the back plate.

[0014] A cooking device includes the blower as described in any one of the above, and further includes an inner container with a hollow interior and a baffle arranged in the inner container. The baffle divides the space in the inner container into a connected hot air chamber and a cooking cavity, and the blower is located in the hot air chamber and is arranged towards the cooking cavity.

[0015] In the blower provided in the above solution, by setting a movable piece that can slide radially relative to the fixed piece, the overall length of the movable fan blade can be adjusted by the length that the movable piece can protrude radially from the fixed piece along the back plate, so as to dynamically adjust the diameter of the movable fan blade, adjust the air flow velocity in the inner container, improve the problem of uneven temperature fields in different layers during multi-layer baking, and enhance the baking effect of multi-layer baking. Description of the Drawings

[0016] Figure 1 It is a schematic cross-sectional view of a cooking device with a blower in an embodiment of the present application.

[0017] Figure 2 is Figure 1 a partial structural schematic diagram of the blower in Figure 1 .

[0018] Figure 3 is Figure 2 a partial structural schematic diagram of the blower inFigure 2 。

[0019] Figure 4 For Figure 1 Partial structure schematic of the medium fan Figure 3 。

[0020] Description of reference numerals:

[0021] 10, cooking equipment; 100, fan; 110, back panel; 111, stopper; 112, edge block; 1121, arc groove; 113, sliding track; 120, movable fan blade; 121, fixing piece; 122, movable piece; 130, linkage assembly; 131, moving part; 1311, second guiding surface; 132, telescopic block; 1321, supporting part; 1322, stress part; 13221, first guiding surface; 140, first elastic part; 150, fixed fan blade; 160, fourth elastic part; 170, rotating part; 171, abutting end; 172, rotating end; 180, mounting plate; 190, through hole; 200, inner container; 210, hot air chamber; 220, cooking cavity; 300, baffle plate. Detailed implementation manners

[0022] To make the above objects, features, and advantages of the present application more apparent and understandable, the following describes the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description 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.

[0023] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 should not be construed as a limitation to the present application.

[0024] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "a plurality" appears, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this application, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the connection inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In this application, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning 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. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is at a lower level than the second feature in terms of horizontal height.

[0027] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0028] Refer to Figure 1 , Figure 1 shows a schematic cross-sectional structure diagram of a cooking device 10 in an embodiment of this application. In an embodiment of this application, a cooking device 10 is provided, which may be a steam oven, an oven, etc., but is not limited thereto. As Figure 1As shown, the cooking device 10 includes a blower 100 as described in any of the following embodiments, and further includes an inner container 200 with a hollow interior and a baffle 300 disposed in the inner container 200. The baffle 300 divides the space inside the inner container 200 into a connected hot air chamber 210 and a cooking chamber 220. The baffle 300 is provided with an air inlet and an air outlet to enable the connection between the hot air chamber 210 and the cooking chamber 220. Among them, the cooking chamber 220 is used for placing and cooking food ingredients, the hot air chamber 210 is used for hot air exchange with the cooking chamber 220, and the blower 100 is located in the hot air chamber 210 and is arranged towards the cooking chamber 220, so that the hot air generated in the hot air chamber 210 can be blown into the cooking chamber 220, thereby improving the baking uniformity and baking efficiency.

[0029] Combined with Figure 2 As shown, Figure 2 The partial structural schematic diagram of the blower 100 in an embodiment of the present application is shown. In an embodiment of the present application, a blower 100 is provided, which can be applied to a cooking device 10 as Figure 1 shown, and can also be applied to other fields.

[0030] As Figure 2 shown, the blower 100 includes a back plate 110, a movable fan blade 120 and a linkage assembly 130. Among them, the back plate 110 is rotatably arranged around its own axis. It can be understood that the blower 100 further includes a rotating shaft for driving the back plate 110 to rotate and a driving member for driving the rotating shaft to rotate. Its structure is not limited and can be any existing driving member and rotating shaft of any structure or material.

[0031] As Figure 2 shown, the movable fan blade 120 is arranged along the radial direction of the back plate 110, and is rotatably connected to the back plate 110 around a rotation axis parallel to the radial direction of the back plate 110. When the movable fan blade 120 rotates, the included angle between the movable fan blade 120 and the back plate 110 can be adjusted, and further the inclination angle of the fan blade and the height protruding from the back plate 110 can be adjusted, so as to realize the adjustment of the air volume of the blower 100.

[0032] As Figure 2 shown, in one of the embodiments, the blower 100 further includes a fixed fan blade 150. The fixed fan blade 150 is connected to the end face of the back plate 110 where the movable fan blade 120 is connected. The fixed fan blade 150 and the movable fan blade 120 are located on the same end face of the back plate 110, and the fixed fan blade 150 is also arranged along the radial direction of the back plate 110. The included angle between the fixed fan blade 150 and the back plate 110 is fixed, and the fixed fan blade 150 and the back plate 110 are arranged at an included angle, so that when the included angle between the movable fan blade 120 and the back plate 110 is the smallest, the fixed fan blade 150 can push the air to flow when the back plate 110 rotates.

[0033] In this embodiment, as Figure 2As shown, there are multiple movable fan blades 120 and fixed fan blades 150, and the numbers of both are equal. 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 in the fan 100 rotates, the gas flow velocity generated by it is uniform. The numbers of the movable fan blades 120 and the fixed fan blades 150 are not limited. In other embodiments, the distributions of the movable fan blades 120 and the fixed fan blades 150 are centrosymmetric about the axis of the back plate 110 respectively.

[0034] As Figure 2 and Figure 3 shown, the linkage assembly 130 is used to drive the movable fan blade 120 to rotate, realize the adjustment of the angle between the movable fan blade 120 and the back plate 110, and thus realize the adjustment of the air volume of the fan 100. It can be understood that a linkage assembly 130 is correspondingly arranged for each movable fan blade 120 to independently adjust the movable fan blade 120.

[0035] As Figure 3 shown, the linkage assembly 130 includes a moving member 131 slidably connected to the back plate 110. As Figure 3 shown, the back plate 110 is provided with a sliding track 113 for restricting the sliding direction of the moving member 131. The sliding track 113 is arranged along the radial direction of the back plate 110, so that the sliding path of the moving member 131 includes an initial position and a sliding position arranged along the radial direction of the back plate 110. For the convenience of illustration, in Figure 3 , 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 applications, the moving members 131 connected to the back plate 110 should be in the same position.

[0036] As Figure 3 shown, the moving member 131 is configured such that when the back plate 110 rotates, the centrifugal force received by the moving member 131 has a tendency to drive the moving member 131 to move from the initial position towards the sliding position. It can be understood that the centrifugal force received by the moving member 131 will increase as the rotation speed of the back plate 110 increases. The moving member 131 needs to overcome frictional force and the like when moving relative to the back plate 110. When the centrifugal force generated by the rotation speed of the back plate 110 on the moving member 131 is sufficient to overcome the frictional force, the moving member 131 will start to move towards the sliding position.

[0037] In one embodiment, the linkage assembly 130 includes a third elastic member (not shown). The third elastic member is connected to the moving member 131 and has a tendency to drive the moving member 131 to move radially toward the axis of the back plate 110. Exemplarily, the third elastic member may be an elastic cord, a spring, etc. When the rotational speed of the back plate 110 is different, the centrifugal force received by the moving member 131 is also different. For the moving member 131 to move along its moving path, it needs to overcome the elastic force of the third elastic member and the frictional force between the moving member 131 and the back plate 110. Therefore, when the rotational speed of the back plate 110 is fast, the elastic force of the third elastic member that the centrifugal force can overcome is greater, that is, the moving member 131 is closer to the sliding position. When the rotational 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. Thus, it can be seen that by adjusting the magnitude of the elastic force of the third elastic member, the rotational speed of the back plate 110 corresponding to the start of movement of the moving member 131 can be adjusted.

[0038] As Figure 2 and Figure 3 shown, when the moving member 131 moves from the initial position toward the sliding position, it drives the movable fan blade 120 to rotate, so that the included angle between the movable fan blade 120 and the back plate 110 increases. Such that within a certain range, the faster the rotational 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 greater the air volume of the fan 100, thereby achieving the effect that the faster the rotational speed, the greater the air volume.

[0039] As Figure 2 and Figure 3 shown, in one embodiment, the linkage assembly 130 includes a telescopic block 132. The telescopic block 132 includes a supporting portion 1321 that can at least partially protrude from the end surface of the back plate 110 connecting the movable fan blade 120, and the supporting portion 1321 is located within the projection of the movable fan blade 120 in the axial direction of the back plate 110. When the moving member 131 moves from the initial position toward the sliding position, it drives the length of the supporting portion 1321 protruding from the end surface of the back plate 110 connecting the movable fan blade 120 to increase, so as to push the movable fan blade 120 away from the back plate 110 through the increase in the length of the supporting portion 1321, realizing the relative rotation of the movable fan blade 120 with respect to the back plate 110 and the increase in the included angle.

[0040] As Figure 3As shown, in one embodiment, the telescopic block 132 is connected to the backplate 110 and can move axially along the backplate 110. The telescopic block 132 further includes a force-receiving portion 1322 located on the moving path of the moving member 131. The force-receiving portion 1322 is connected to the supporting portion 1321, and the supporting portion 1321 passes through the backplate 110 to partially protrude from the backplate 110. Both the moving member 131 and the force-receiving portion 1322 are located on the side of the backplate 110 away from the movable fan blade 120, and the end face of the force-receiving portion 1322 facing the moving member 131 is a first guiding surface 13221 inclined with an upward slope, so as to facilitate the conversion of the radial abutting force between the moving member 131 and the telescopic block 132 into a force capable of driving the telescopic block 132 to move axially relative to the backplate 110 along the backplate 110, thereby realizing that when the moving member 131 moves from the initial position towards the sliding position, the length of the supporting portion 1321 protruding from the end face of the backplate 110 connecting the movable fan blade 120 increases.

[0041] As Figure 3 shown, in one embodiment, the end face of the moving member 131 facing the telescopic block 132 is a second guiding surface 1311 arranged parallel to the first guiding surface 13221, so as to facilitate the conversion of the radial abutting force between the moving member 131 and the telescopic block 132 into a force capable of driving the telescopic block 132 to move axially relative to the backplate 110 along the backplate 110.

[0042] As Figure 2 and Figure 3 shown, the backplate 110 is provided with a through hole 190. The end face of the backplate 110 away from the movable fan blade 120 is connected to a mounting plate 180. The mounting plate 180 has an annular structure and is coaxially arranged with the backplate 110. Both the moving member 131 and the telescopic block 132 are connected to the mounting plate 180, which is convenient for production and processing.

[0043] As Figure 3 shown, in one embodiment, the linkage assembly 130 includes a first elastic member 140. The first elastic member 140 is located between the force-receiving portion 1322 and the end face of the backplate 110 away from the movable fan blade 120, and the first elastic member 140 has a tendency to drive the force-receiving portion 1322 to move away from the backplate 110, so that when the moving member 131 is reset to the initial position, the length of the supporting portion 1321 protruding from the end face of the backplate 110 connecting the movable fan blade 120 is shortened, thereby reducing the angle between the movable fan blade 120 and the backplate 110, and thus realizing the effect that the smaller the rotational speed, the smaller the air volume.

[0044] In one embodiment, the linkage assembly 130 further includes a second elastic member (not shown). Exemplarily, the second elastic member can be a spring, an elastic cord, etc. The two ends of the second elastic member are respectively connected to the movable fan blade 120 and the support portion 1321. When the moving member 131 is in the sliding position, the length of the support portion 1321 protruding from the back plate 110 is the longest. At this time, the second elastic member has a tendency to drive the movable fan blade 120 away from the support portion 1321, so as to drive the movable fan blade 120 to continue rotating by the elastic force of the second elastic member, thereby further increasing the angle between the movable fan blade 120 and the back plate 110. Preferably, when the moving member 131 is in the initial position, the length of the support portion 1321 protruding from the back plate 110 is the shortest. At this time, the second elastic member has a tendency to drive the movable fan blade 120 close to the support portion 1321, so as to drive the movable fan blade 120 to rotate by the elastic force of the second elastic member, and avoid the state that the movable fan blade 120 maintains a large angle between it and the back plate 110 after the support portion 1321 is shortened.

[0045] As Figure 2 shown, in one embodiment, the back plate 110 includes a stop block 111 protruding from the end face of the back plate 110 connecting the movable fan blade 120. The stop block 111 is located on the rotation path of the movable fan blade 120. When the movable fan blade 120 abuts against the stop block 111, the movable fan blade 120 is perpendicular to the back plate 110. At this time, the movable fan blade 120 can drive the most air flow, so as to achieve the faster the rotation speed, the greater the air volume.

[0046] In the above solution, by providing the rotatable movable fan blade 120 and the linkage assembly 130 affected by centrifugal force, when the centrifugal force drives the moving member 131 to move, the angle between the movable fan blade 120 and the back plate 110 changes accordingly. It can be controlled that the movable fan blade 120 opens at high speed of the fan 100 and closes at low speed of the fan 100. And 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. Furthermore, it can meet the requirement of large air volume at high speed and small air volume at low speed to obtain better cooking effect.

[0047] As Figure 2 and Figure 4As shown, in one embodiment, the movable fan blade 120 includes a fixed piece 121 and a movable piece 122. The fixed piece 121 is rotatably connected to the back plate 110, and the movable piece 122 rotates synchronously with the fixed piece 121. The length of the movable piece 122 along the radial direction of the back plate 110 is greater than the length of the fixed piece 121 along the radial direction of the back plate 110, and the movable piece 122 can slide relative to the fixed piece 121 along the radial direction of the back plate 110, so as to adjust the overall length of the movable fan blade 120 by the length that the movable piece 122 can protrude from the fixed piece 121 along the radial direction of the back plate 110, realize dynamically adjusting the diameter of the movable fan blade 120, and further adjust the air flow velocity in the multi-layer baking mode.

[0048] As Figure 2 and Figure 4 As shown, in one embodiment, the back plate 110 further includes an edge block 112 protruding from the end face of the back plate 110 connecting the movable fan blade 120. The edge block 112 is located at the circular edge of the back plate 110 and is in the same radial direction as the movable piece 122. The edge block 112 is provided with an arc-shaped groove 1121. One end of the movable piece 122 away from the axis of the back plate 110 penetrates and is slidably connected in the arc-shaped groove 1121, so that when the movable piece 122 rotates synchronously with the fixed piece 121, the movable piece 122 rotates along the arc-shaped groove 1121, and when the movable piece 122 slides relative to the fixed piece 121, the movable piece 122 penetrates in the arc-shaped groove 1121, so as to limit the rotation and sliding of the movable piece 122 in the radial direction of the back plate 110 through the arc-shaped groove 1121.

[0049] As Figure 2 and Figure 4 As shown, in one embodiment, the fan 100 further includes a fourth elastic member 160. The two ends of the fourth elastic member 160 are respectively connected to the movable piece 122 and the edge block 112, and has a tendency to drive the movable piece 122 to move along the radial direction towards the axis of the back plate 110, so that as Figure 4 shown, when the movable piece 122 is not subjected to the force exerted by an object other than the fourth elastic member 160, the movable piece 122 remains at a position close to the axis of the back plate 110, and when the movable piece 122 is abutted by the following rotating member 170, the movable piece 122 slides relative to the fixed piece 121.

[0050] As Figure 4As shown, in one embodiment, the blower 100 further includes 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 includes a rotating end 172 connected to the abutting end 171 and used to drive the abutting end 171 to rotate. The rotating end 172 and the back plate 110 are coaxially arranged, and the two are independently driven to rotate. The distance between the abutting end 171 and the rotation 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. When the rotating member 170 rotates, the abutting end 171 intermittently abuts the movable piece 122 to drive the movable piece 122 to slide relative to the fixed piece 121. Each time the rotating member 170 rotates one week, it abuts each movable piece 122 respectively, so as to realize that the movable piece 122 is periodically abutted by the abutting end 171, realize the periodic adjustment of the length of the movable piece 122 protruding radially from the fixed piece 121 along the back plate 110, and then periodically adjust the overall length of the movable fan blade 120, realize the periodic dynamic adjustment of the diameter of the movable fan blade 120, and then adjust the air flow velocity in the multi-layer baking mode.

[0051] 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. In the blower 100, the position closer to the rotation axis of the back plate 110 is closer to the negative pressure area. When the movable piece 122 protrudes from the end of the fixed piece 121 close to the axis of the back plate 110, the air flow adjustment effect is very small. As Figure 4 As shown, in one embodiment, when the abutting end 171 abuts the movable piece 122, the end of the movable piece 122 far from the axis of the back plate 110 protrudes from the fixed piece 121, so that the length of the movable piece 122 protruding from the end of the fixed piece 121 far from the axis of the back plate 110 is periodically adjusted due to rotation, and then the overall length of the movable fan blade 120 is periodically adjusted, realizing the periodic dynamic adjustment of the diameter of the movable fan blade 120, and then adjusting the air flow velocity in the multi-layer baking mode.

[0052] In one embodiment, the end face of the abutting end 171 facing the movable piece 122 is of an arc structure, so that when the rotating member 170 rotates, the abutting end 171 can more easily push the movable piece 122 to move radially outward.

[0053] In the above solution, by setting the movable piece 122 that can slide radially relative to the fixed piece 121, the overall length of the movable 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, realizing the dynamic adjustment of the diameter of the movable fan blade 120, adjusting the air flow velocity in the inner tank 200, improving the problem of uneven temperature fields in different layers during multi-layer baking, and enhancing the baking effect of multi-layer baking.

[0054] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0055] The above-described embodiments only represent several implementation manners of the present application, and the description is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A fan, characterized in that, The blower includes: a back plate, which is rotatably arranged around its own axis; and a movable fan blade, which is arranged along the radial direction of the back plate, and the movable fan blade includes a fixed piece and a movable piece. The length of the movable piece along the radial direction of the back plate is greater than the length of the fixed piece along the radial direction of the back plate, and the movable piece can slide relative to the fixed piece along the radial direction of the back plate.

2. The fan according to claim 1, wherein, The back plate further includes an edge block protruding from the end face of the back plate connecting the movable fan blade, and the back plate and the movable piece are located on the same radial line and at one end of the movable piece away from the axis of the back plate. The blower further includes a fourth elastic member, and both ends of the fourth elastic member are respectively connected to the movable piece and the edge block, and have a tendency to drive the movable piece to move along the radial direction towards the axis of the back plate.

3. The blower according to claim 2, wherein, The edge block is located at the circumferential edge of the back plate.

4. The fan according to claim 2, wherein The blower further includes a rotating member rotatably connected to the back plate. The rotating member rotates coaxially with the back plate. One end of the rotating member close to the movable fan blade 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 fan blade and the axis of the back plate. When the rotating member rotates, the abutting end intermittently abuts the movable fan blade to drive the movable fan blade to slide relative to the fixed piece.

5. The blower according to claim 4, characterized in that, When the abutting end abuts the movable fan blade, one end of the movable fan blade away from the axis of the back plate protrudes from the fixed piece.

6. The fan according to claim 4, wherein, The end face of the abutting end facing the movable fan blade is in an arc structure.

7. The fan according to claim 1, characterized in that, The fixed piece is rotatably connected to the back plate around a rotation axis parallel to the radial direction of the back plate.

8. The blower according to claim 1, wherein The blower further includes a fixed fan blade, which is connected to the end face of the back plate connecting the movable fan blade and is arranged along the radial direction of the back plate. The fixed fan blade and the back plate are arranged at an angle.

9. The fan according to claim 8, characterized in that, The movable fan blade and the fixed fan blade are staggered along the circumferential direction of the back plate.

10. A cooking device, characterized in that, Including the blower according to any one of claims 1-9, further includes an inner container with a hollow interior and a baffle plate arranged in the inner container. The baffle plate divides the space in the inner container into a connected hot air chamber and a cooking cavity, and the blower is located in the hot air chamber and is arranged towards the cooking cavity.

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