Fan and cooking equipment

Abstract

The invention relates to a draught fan and cooking equipment. The draught fan comprises a back plate, movable fan blades and a linkage assembly. The movable fan blades can be rotationally connected to the back plate around a rotating axis parallel to the radial direction of the back plate; the linkage assembly is used for driving the movable fan blades to rotate and comprises a moving part slidably connected to the back plate, and the sliding path of the moving part comprises an initial position and a sliding position which are arranged in the radial direction of the back plate; the centrifugal force borne by the moving part tends 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, the moving part drives the movable fan blades to rotate so that the included angle between the movable fan blades and the back plate can be increased. According to the scheme, the large air volume needed at the high rotating speed and the small air volume needed at the low rotating speed are met, and the better cooking effect is achieved.

Description

Technical Field

[0001] The present application relates to the field of electrical appliance technology, and in particular to fans and cooking equipment. Background Art

[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 on the rear side of the inner pot, and the hot air baffle and the back plate of the inner pot form a hot air chamber. A hot air blower with a back heating pipe arranged around the outer periphery of the fan blade is installed in the hot air chamber, so that when the cooking device is working, the hot air in the inner pot and the hot air chamber can be convected. Specifically, the air in the inner pot 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 pot through the air outlet of the hot air baffle under the action of the centrifugal force of the fan blade, and is used to bake the food in the inner pot, thereby realizing hot air convection between the inner pot and the hot air chamber, thereby improving baking uniformity and improving baking efficiency.

[0003] When the fan speed is fixed, the area of ​​the low-pressure area in the center of the fan blade is constant, and the velocity of the airflow around the fan blade is also constant, which makes the velocity of the airflow between the hot air chamber and the inner pot constant. However, for ovens using dual-speed hot air blowers, existing fans cannot meet the requirements of different air volumes at different speeds, which affects the cooking effect of the cooking equipment. Summary of the invention

[0004] Based on this, it is necessary to provide a fan and cooking equipment to address the problem that existing fans cannot meet the demand for air volume adjustment.

[0005] A fan, comprising a back plate, movable blades and a linkage assembly; the back plate can be rotatably arranged around its own axis; the movable blades are arranged along the radial direction of the back plate and can be rotatably connected to the back plate around a rotation axis parallel to the radial direction of the back plate; the linkage assembly is used to drive the movable blades to rotate, the linkage assembly comprises a moving part slidably connected to the back plate, the sliding path of the moving part comprises an initial position and a sliding position arranged along the radial direction of the back plate, the moving part is configured so that when the back plate rotates, the centrifugal force exerted on the moving part has a tendency to drive the moving part to move from the initial position toward the sliding position, and when the moving part moves from the initial position toward the sliding position, it drives the movable blades to rotate so as to increase the angle between the movable blades and the back plate.

[0006] In one embodiment, the linkage assembly includes a telescopic block, which includes a supporting portion that can at least partially protrude from the end surface of the back plate connected to the movable fan blade, and the supporting portion is located within the axial projection of the movable fan blade on the back plate. When the movable member moves from an initial position toward a sliding position, the length of the supporting portion protruding from the end surface of the back plate connected to the movable fan blade increases.

[0007] In one embodiment, 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 facing the moving member is a first guide surface inclined at an upward slope.

[0008] In one embodiment, the end surface of the moving member facing the telescopic block is a second guide surface arranged parallel to the first guide surface.

[0009] In one embodiment, 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.

[0010] In one embodiment, the linkage assembly also includes a second elastic member, and the two ends of the second elastic member are respectively connected to the movable fan blade and the support portion. When the movable member is in the sliding position, the length of the support portion 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 portion.

[0011] In one of the embodiments, 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.

[0012] In one embodiment, the linkage assembly includes a third elastic member, the third elastic member is 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.

[0013] In one of the embodiments, 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, and the fixed blades and the back plate are arranged at an angle.

[0014] In one of the embodiments, the movable blades and the fixed blades are staggeredly distributed 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 one 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, two ends of which are respectively connected to the movable sheet and the edge block, and have a tendency to drive the movable sheet to move radially toward the axis of the back plate.

[0018] In one embodiment, the fan also includes a rotating part rotatably connected to the back plate, the rotating part rotates coaxially with the back plate, 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 back plate, 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.

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

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

[0021] A cooking device comprises a fan as described in any of the above embodiments, and also comprises an inner pot with a hollow interior and a baffle arranged in the inner pot, wherein 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.

[0022] The fan provided in the above scheme is provided with rotatable movable blades and a linkage component affected by centrifugal force. When the centrifugal force drives the moving part to move, the angle between the movable blades and the back plate changes accordingly. The movable blades can be controlled to open when the fan rotates at a high speed and to close when the fan rotates at a low speed. Within a certain range, the faster the speed of the back plate, the larger the angle between the movable blades and the back plate, and the larger the angle between the movable blades and the back plate, the greater the air volume of the fan, thereby satisfying 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of a cooking device with a fan in one embodiment of the present application.

[0024] Figure 2 for Figure 1 Schematic diagram of the partial structure of the blower Figure 1 .

[0025] Figure 3 for Figure 2 Schematic diagram of the partial structure of the blower Figure 2 .

[0026] Figure 4 for Figure 1 Schematic diagram of the partial structure of the blower Figure 3 .

[0027] Description of reference numerals:

[0028] 10. cooking equipment; 100. fan; 110. back plate; 111. stopper; 112. edge block; 1121. arc groove; 113. sliding track; 120. movable blade; 121. fixed plate; 122. movable plate; 130. linkage assembly; 131. moving part; 1311. second guide surface; 132. telescopic block; 1321. supporting part; 1322. force-bearing part; 13221. first guide surface; 140. first elastic part; 150. fixed blade; 160. fourth elastic part; 170. rotating part; 171. abutting end; 172. rotating end; 180. mounting plate; 190. through hole; 200. liner; 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 implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of 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 violating the connotation of the present application, so 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 the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central 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 a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0035] See also Figure 1 , Figure 1 1 shows a schematic cross-sectional structure diagram of a cooking device 10 in an embodiment of the present application. In an embodiment of the present application, a cooking device 10 is provided, which may be a steam oven, an oven, etc., but is not limited thereto. Figure 1 As shown, the cooking device 10 includes a fan 100 as described in any of the following embodiments, and also includes an inner pot 200 with a hollow interior and a baffle 300 disposed in the inner pot 200. The baffle 300 divides the space in the inner pot 200 into a hot air chamber 210 and a cooking cavity 220 that are connected. The baffle 300 is provided with an air inlet and an air outlet to achieve the connection between the hot air chamber 210 and the cooking cavity 220. The cooking cavity 220 is used to place and cook food, the hot air chamber 210 is used to exchange hot air with the cooking cavity 220, and the fan 100 is located in the hot air chamber 210 and is disposed toward 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 the baking efficiency.

[0036] Combination Figure 2 As shown, Figure 2 FIG. 1 shows a partial structural diagram of a fan 100 in an embodiment of the present application. In an embodiment of the present application, a fan 100 is provided, which can be applied to Figure 1 The cooking device 10 shown can also be applied to other fields.

[0037] like Figure 2 As shown, the fan 100 includes a back plate 110, movable blades 120 and a linkage assembly 130, wherein the back plate 110 can be rotatably arranged around its own axis. It can be understood that the fan 100 also includes 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, and it can be an existing driving member and rotating shaft of any structure or material.

[0038] like Figure 2As shown, the movable fan blades 120 are arranged along the radial direction of the back plate 110, and can be rotatably connected to the back plate 110 around a rotation axis parallel to the radial direction of the back plate 110. The movable fan blades 120 rotate so that the angle between the movable fan blades 120 and the back plate 110 can be adjusted, and then the inclination angle of the fan blades and the height protruding from the back plate 110 can be adjusted, thereby realizing the adjustment of the air volume of the fan 100.

[0039] like Figure 2 As shown, in one embodiment, the fan 100 also includes a fixed blade 150, which is connected to the end surface of the back plate 110 connected to the movable blade 120, the fixed blade 150 and the movable blade 120 are located on the same end surface of the back plate 110, and the fixed blade 150 is also arranged along the radial direction of the back plate 110, the angle between the fixed blade 150 and the back plate 110 is fixed, and the fixed blade 150 and the back plate 110 are arranged at an angle, so that when the angle between the movable blade 120 and the back plate 110 is the smallest, the fixed blade 150 can push the air flow when the back plate 110 rotates.

[0040] In this embodiment, if Figure 2 As shown, there are multiple movable blades 120 and fixed blades 150, and the number of the two is equal. In one embodiment, the movable blades 120 and the fixed blades 150 are staggered along the circumference 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 number of movable blades 120 and fixed blades 150 is not limited. In other embodiments, the distribution of the movable blades 120 and the fixed blades 150 is respectively symmetrical with respect to the axis of the back plate 110 as the center.

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

[0042] like Figure 3 As shown, the linkage assembly 130 includes a moving member 131 slidably connected to the back plate 110, such as Figure 3 As shown, the back plate 110 is provided with a sliding track 113 for limiting 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, Figure 3In the embodiment, two opposite moving members 131 are located at the initial position, and another two opposite moving members 131 are located at the sliding position. In practical applications, the moving members 131 connected to the back plate 110 should be at the same position.

[0043] like Figure 3 As shown, the movable member 131 is configured so that when the back plate 110 rotates, the centrifugal force exerted on the movable member 131 has a tendency to drive the movable member 131 to move from the initial position toward the sliding position. It can be understood that the centrifugal force exerted on the movable member 131 will increase as the rotation speed of the back plate 110 increases. The movement of the movable member 131 relative to the back plate 110 needs to overcome friction, etc. When the centrifugal force on the movable member 131 generated by the rotation speed of the back plate 110 is sufficient to overcome the friction, the movable member 131 will begin to move toward the sliding position.

[0044] In one of the embodiments, the linkage assembly 130 includes a third elastic member (not shown), which is connected to the moving member 131, and the third elastic member has a trend of driving the moving member 131 to move radially toward the axis of the back plate 110. Exemplarily, the third elastic member can be an elastic rope, a spring, etc. When the rotating speed of the back plate 110 is different, the centrifugal force received by the moving member 131 is also different, and the moving member 131 moves on its moving path and needs to overcome the elastic force of the third elastic member and the friction between the moving member 131 and the back plate 110. Therefore, when the rotating speed of the back plate 110 is fast, the elastic force of the third elastic member that the centrifugal force can overcome is more, 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 now the moving member 131 is closer to the initial position. As can be seen from this, the rotating speed of the corresponding back plate 110 can be adjusted by adjusting the elastic force of the third elastic member.

[0045] like Figure 2 and Figure 3 As shown, when the movable member 131 moves from the initial position toward the sliding position, it drives the movable fan blades 120 to rotate so as to increase the angle between the movable fan blades 120 and the back plate 110, so that within a certain range, the faster the rotation speed of the back plate 110, the larger the angle between the movable fan blades 120 and the back plate 110, and the larger the angle between the movable fan blades 120 and the back plate 110, the greater the air volume of the fan 100, thereby achieving the effect of faster rotation speed and greater air volume.

[0046] like Figure 2 and Figure 3As shown, in one embodiment, the linkage assembly 130 includes a telescopic block 132, and the telescopic block 132 includes a support portion 1321 that can at least partially protrude from the end surface of the back plate 110 connected to the movable fan blade 120, and the support portion 1321 is located within the axial projection of the movable fan blade 120 on the back plate 110. When the movable member 131 moves from the initial position toward the sliding position, the length of the support portion 1321 protruding from the end surface of the back plate 110 connected to the movable fan blade 120 is increased, so that the movable fan blade 120 is pushed away from the back plate 110 by the increase in the length of the support portion 1321, so that the movable fan blade 120 rotates relative to the back plate 110 and the angle increases.

[0047] like Figure 3 As shown, in one embodiment, the telescopic block 132 is connected to the back plate 110 and can move in the axial direction of the back plate 110, the telescopic block 132 also includes a force-bearing portion 1322 located on the moving path of the moving member 131, the force-bearing portion 1322 is connected to the supporting portion 1321, and the supporting portion 1321 passes through the back plate 110 to partially protrude from the back plate 110, the moving member 131 and the force-bearing portion 1322 are both located on the side of the back plate 110 away from the movable fan blades 120, and the end face of the force-bearing portion 1322 facing the moving member 131 is a first guide surface 13221 inclined at an upward slope, so that the radial abutment force between the moving member 131 and the telescopic block 132 is converted into a force that can drive the telescopic block 132 to move relative to the back plate 110 in the axial direction of the back plate 110, thereby realizing that when the moving member 131 moves from the initial position toward the sliding position, the length of the end face of the supporting portion 1321 protruding from the back plate 110 connected to the movable fan blades 120 increases.

[0048] like Figure 3 As shown, in one embodiment, the end face of the moving member 131 facing the telescopic block 132 is a second guide surface 1311 arranged parallel to the first guide surface 13221, so that the radial abutment force between the moving member 131 and the telescopic block 132 is converted into a force that can drive the telescopic block 132 to move axially relative to the back plate 110.

[0049] like Figure 2 and Figure 3 As shown, the back plate 110 is provided with a through hole 190, and the end face of the back plate 110 facing away from the movable fan blade 120 is connected to the mounting plate 180. The mounting plate 180 is annular in structure and is coaxially arranged with the back plate 110. The movable part 131 and the telescopic block 132 are both connected to the mounting plate 180 for easy production and processing.

[0050] like 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 surface 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 surface 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 at lower speed.

[0051] In one embodiment, the linkage assembly 130 also includes a second elastic member (not shown), and illustratively, the second elastic member can be a spring, an elastic rope, etc. The two ends of the second elastic member are connected to the movable blade 120 and the support portion 1321, respectively. When the movable member 131 is located 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 trend of driving the movable blade 120 away from the support portion 1321, so as to use the elastic force of the second elastic member to drive the movable blade 120 to continue to rotate, and then continue to increase the angle between the movable blade 120 and the back plate 110. Preferably, when the movable member 131 is located 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 trend of driving the movable blade 120 close to the support portion 1321, so as to use the elastic force of the second elastic member to drive the movable blade 120 to rotate, and avoid the state where the movable blade 120 maintains a larger angle between it and the back plate 110 after the support portion 1321 is shortened.

[0052] like Figure 2 As shown, in one embodiment, the back plate 110 includes a stopper 111 protruding from the end surface of the back plate 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 plate 110. At this time, the movable fan blade 120 can drive the most airflow, so that the faster the rotation speed, the greater the air volume.

[0053] In the above scheme, by setting a rotatable movable fan blade 120 and a linkage assembly 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 larger the air volume of the fan 100, thereby satisfying 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] like Figure 2 and Figure 4 As shown, in one embodiment, the movable blade 120 includes a fixed sheet 121 and a movable sheet 122, the fixed sheet 121 is rotatably connected to the back plate 110, and the movable sheet 122 rotates synchronously with the fixed sheet 121. The length of the movable sheet 122 along the radial direction of the back plate 110 is greater than the length of the fixed sheet 121 along the radial direction of the back plate 110, and the movable sheet 122 can slide relative to the fixed sheet 121 along the radial direction of the back plate 110, so that the length of the entire movable blade 120 can be adjusted by the length of the movable sheet 122 protruding from the fixed sheet 121 along the radial direction of the back plate 110, so as to realize dynamic adjustment of the diameter of the movable blade 120, and then adjust the airflow rate in the multi-layer baking mode.

[0055] like Figure 2 and Figure 4 As shown, in one embodiment, the back plate 110 also includes an edge block 112 protruding from the end face of the back plate 110 connected to the movable fan blade 120, the edge block 112 is located at the circumferential edge of the back plate 110 and is located in the same radial direction as the movable sheet 122, the edge block 112 is provided with an arc groove 1121, and the end of the movable sheet 122 away from the axis of the back plate 110 is penetrated and slidably connected in the arc groove 1121, so that when the movable sheet 122 rotates synchronously with the fixed sheet 121, the movable sheet 122 rotates along the arc groove 1121, and when the movable sheet 122 slides relative to the fixed sheet 121, the movable sheet 122 is penetrated in the arc groove 1121 to limit the rotation of the movable sheet 122 and the sliding in the radial direction of the back plate 110 through the arc groove 1121.

[0056] like Figure 2 and Figure 4 As shown, in one embodiment, the fan 100 further includes a fourth elastic member 160, the two ends of which are respectively connected to the movable sheet 122 and the edge block 112, and have a tendency to drive the movable sheet 122 to move radially toward the axis of the back plate 110, so that Figure 4 As shown, when the movable sheet 122 is not subjected to force from any object except the fourth elastic member 160 , the movable sheet 122 remains in a position close to the axis of the back plate 110 , and only when the movable sheet 122 is abutted by the rotating member 170 described below, does the movable sheet 122 slide relative to the fixed sheet 121 .

[0057] like Figure 4As shown, in one embodiment, the fan 100 also includes a rotating member 170 rotatably connected to the back plate 110, the rotating member 170 rotates coaxially with the back plate 110, the end of the rotating member 170 close to the movable sheet 122 is an abutment end 171, the rotating member 170 also includes a rotating end 172 connected to the abutment end 171 and used to drive the abutment end 171 to rotate, the rotating end 172 and the back plate 110 are coaxially arranged, and the two are driven to rotate independently. 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 axis of the movable sheet 122 and the back plate 110, so that when the rotating member 170 rotates, the abutting end 171 intermittently abuts the movable sheet 122 to drive the movable sheet 122 to slide relative to the fixed sheet 121, and the rotating member 170 abuts each movable sheet 122 respectively every time it rotates one circle, so that the movable sheet 122 is periodically abutted by the abutting end 171, and the length of the movable sheet 122 protruding from the fixed sheet 121 along the radial direction of the back plate 110 is periodically adjusted, and then the overall length of the movable fan blade 120 is periodically adjusted, so that the diameter of the movable fan blade 120 is periodically dynamically adjusted, and then the airflow velocity is adjusted in the multi-layer baking mode.

[0058] It is understandable that, since the length of the movable sheet 122 is greater than that of the fixed sheet 121, when the movable sheet 122 moves relative to the fixed sheet 121, there is always a portion protruding from the fixed sheet 121. In the fan 100, the closer the position is to the rotation axis of the back plate 110, the closer it is to the negative pressure zone. Therefore, when the movable sheet 122 protrudes from the end of the fixed sheet 121 close to the axis of the back plate 110, the airflow adjustment effect generated is very small. Figure 4 As shown, in one of the embodiments, when the abutting end 171 abuts against the movable sheet 122, one end of the movable sheet 122 away from the axis of the back plate 110 protrudes from the fixed sheet 121, so that the length of the end of the movable sheet 122 protruding from the fixed sheet 121 away from the axis of the back plate 110 is periodically adjusted due to the rotation, and then the overall length of the movable fan blade 120 is periodically adjusted, thereby realizing periodic dynamic adjustment of the diameter of the movable fan blade 120, and then adjusting the airflow rate in the multi-layer baking mode.

[0059] In one embodiment, the end surface of the abutting end 171 facing the movable piece 122 is in an arc-shaped structure, so that when the rotating member 170 rotates, the abutting end 171 can more easily push the movable piece 122 to move radially toward the outer periphery.

[0060] In the above scheme, by providing an active sheet 122 that can slide radially relative to the fixed sheet 121, the overall length of the active fan blade 120 can be adjusted by the length of the active sheet 122 that protrudes radially from the fixed sheet 121 along the back plate 110, thereby dynamically adjusting the diameter of the active fan blade 120, adjusting the air flow rate of the inner pot 200, improving the problem of uneven temperature fields in different layers during multi-layer baking, and improving the baking effect of the multi-layer baking.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A fan, characterized in that: The fan comprises: A back plate is rotatably arranged around its own axis; A movable fan blade is arranged along the radial direction of the back plate and is rotatably connected to the back plate around a rotation axis parallel to the radial direction of the back plate; and A linkage assembly is used to drive the movable fan blades to rotate, the linkage assembly includes a moving part slidably connected to the back plate, the sliding path of the moving part includes an initial position and a sliding position arranged radially along the back plate, the moving part is configured so that when the back plate rotates, the centrifugal force exerted on the moving part has a tendency to drive the moving part to move from the initial position toward the sliding position, and when the moving part moves from the initial position toward the sliding position, it drives the movable fan blades to rotate so that the angle between the movable fan blades and the back plate increases.

2. The fan according to claim 1, characterized in that: The linkage assembly includes a telescopic block, which includes a supporting portion that can at least partially protrude from the end surface of the back plate connected to the movable fan blade, and the supporting portion is located within the axial projection of the movable fan blade on the back plate. When the movable member moves from an initial position toward a sliding position, the length of the supporting portion protruding from the end surface of the back plate connected to the movable fan blade increases.

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 facing 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 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 portion. When the movable member is in the sliding position, the length of the support portion 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 portion.

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, the third elastic member is 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 comprises 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 sheet, the edge block is provided with an arc groove, and one end of the movable sheet 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 comprises a fourth elastic member, two ends of which are respectively connected to the movable sheet and the edge block, and have a tendency to drive the movable sheet 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 back plate, the rotating part rotates coaxially with the back plate, 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 back plate, 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 sheet, one end of the movable sheet away from the axis of the back plate protrudes from the fixed sheet.

16. The fan according to claim 14, characterized in that: The end surface of the abutting end facing the movable sheet 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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