A fan blade structure and oven having the same

Abstract

The present invention belongs to the technical field related to ovens, and discloses a fan blade structure and an oven having the same, wherein the fan blade structure comprises a back plate; a blade, which is rotatably mounted on the back plate, and the blade comprises two arc plates connected and symmetrically arranged relative to the rotation axis, and the concave surfaces of the two arc plates are the windward surfaces; a positioning member, which is fixed on the back plate, and the positioning member is configured to limit the rotation of the blade and adjust the blade angle of the blade. By setting the blade as two arc plates connected and symmetrically arranged relative to the rotation axis, and the concave surfaces of the two arc plates are the windward surfaces, no vortex is generated during forward or reverse rotation, and the same amount of air can be generated by the fan blade structure during forward and reverse rotation. In addition, the concave surface of the arc plate can also form a windward surface to generate a larger amount of air. At the same time, the positioning member is used to limit the rotation of the blade to ensure that the blade is in a desired blade angle state. Moreover, the width of the positioning member can be adjusted as needed to change the blade angle of the blade.

Description

Technical Field

[0001] The present invention relates to the technical field related to ovens, and in particular to a fan blade structure and an oven having the same. Background Art

[0002] When using a home oven, the key factor affecting the baking effect of food is the uniformity of the temperature inside the oven. If the temperature distribution inside the oven is uneven, the baked food will be unevenly colored or even cooked. Most ovens now have a forced convection mode, that is, the back panel has heating elements and fan blades. Especially when baking multiple layers of food, the fan blades on the back drive the gas flow inside the oven cavity to adjust the temperature distribution. But even so, in existing ovens, the fan blades generally rotate in one direction, that is, clockwise (positive rotation), which will result in poor color uniformity of the baked food, that is, half of the food has been colored, while the other half has not.

[0003] In order to solve the above problems, the fan blades need to be able to achieve forward and reverse rotation, and the flow field generated by the rotation of the fan blades during forward and reverse rotation needs to be symmetrical. Therefore, the blades of the existing fan blades that can be reversed are straight guide blades, but the straight guide blade fan blades have the following problems: the straight guide blade fan blades have a large circumferential velocity component when rotating, so that a central vortex is generated in the middle of the oven facing the fan blades. The central vortex area belongs to the flow dead zone. During the operation of the oven, the convective heat transfer effect is poor, so the temperature of this area is significantly lower than that of the surrounding areas.

[0004] There are also structures that use diamond-shaped fan blades, which will not produce vortices when rotating forward and reversely, but their size is larger, the fan blades are not leaf-shaped, and the windward side is convex outward, so the amount of air generated is smaller. Summary of the invention

[0005] The object of the present invention is to provide a fan blade structure which will not generate vortices during forward and reverse rotation and can generate a larger amount of wind.

[0006] Another object of the present invention is to provide an oven that adopts the above-mentioned fan blade structure to make the temperature distribution more uniform when baking food.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A fan blade structure, comprising:

[0009] Back panel;

[0010] A blade is rotatably mounted on the back plate, wherein the blade comprises two arc-shaped plates connected to each other and symmetrically arranged relative to the rotation axis of the blade, and the concave surfaces of the two arc-shaped plates are windward surfaces;

[0011] A positioning member is fixed to the back plate, and is configured to limit the rotation of the blade and adjust the blade angle of the blade, wherein the blade angle is the angle between the section of the arc plate and a vertical plane passing through the center line of the back plate.

[0012] Preferably, the positioning member is arranged between the rotation axis and the center of the back plate, and the positioning member is located on the concave side of the arc plate.

[0013] Preferably, a line of the positioning member in the projection of the back plate pointing to the arc-shaped plate is defined as a first projection line, and a perpendicular bisector of the first projection line passes through the center of the back plate.

[0014] Preferably, the height of the positioning member is smaller than the height of the blade.

[0015] Preferably, a blade shaft is fixedly provided at the bottom of the blade, and the blade shaft is rotatably mounted on the back plate, and the symmetry center of the two arc plates coincides with the axis center of the blade shaft.

[0016] Preferably, a fan blade shaft is fixedly provided on the back plate, the blades are rotatably mounted on the fan blade shaft, and the symmetry centers of the two arc-shaped plates coincide with the axis center of the fan blade shaft.

[0017] Preferably, an axial hole is opened at the bottom of the blade, a bearing is installed in the axial hole, and the fan blade shaft is fixedly inserted into the inner ring of the bearing.

[0018] Preferably, the bearing is a ball bearing, and the balls of the ball bearing protrude from the end surface of the inner ring and roll on the back plate.

[0019] Preferably, a positioning hole is opened in the center of the back plate, and the positioning hole is in a half-moon shape.

[0020] The present invention also provides an oven, comprising the above-mentioned fan blade structure.

[0021] The beneficial effects of the present invention are as follows: by setting the blades as two connected arc-shaped plates symmetrically arranged relative to the rotation axis, and the concave surfaces of the two arc-shaped plates are the windward surfaces, no vortex will be generated during forward or reverse rotation, and the same amount of wind can be generated by the fan blade structure during forward and reverse rotation. In addition, the concave surface of the arc-shaped plate can also form a windward surface to generate a larger amount of wind. At the same time, the positioning member is used to limit the rotation of the blade to ensure that the blade is in the desired blade angle state. Moreover, the width of the positioning member can be adjusted as needed to achieve the change of the blade angle of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the fan blade structure provided by the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the fan blade structure hidden back plate provided by the present invention;

[0024] Figure 3 It is a schematic diagram of the state of the fan blade structure provided by the present invention when it is in forward rotation (clockwise rotation);

[0025] Figure 4 It is a schematic diagram of the state of the fan blade structure provided by the present invention when it is in reverse rotation (counterclockwise rotation).

[0026] In the figure:

[0027] 1. Back plate; 11. Positioning hole; 2. Blade; 21. Curved plate; 22. Guide surface; 3. Positioning piece; 31. Midline; 4. Fan blade shaft. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] The present invention provides a fan blade structure which can be applied to an oven to achieve uniform distribution of temperature inside the oven, so that when the oven bakes food, the food baking effect is better. Figure 1 As shown, the fan blade structure includes a back plate 1, blades 2 and positioning members 3, wherein the blades 2 and the positioning members 3 are both placed on the back plate 1, and the blades 2 can rotate relative to the back plate 1, and the positioning members 3 can limit the rotation of the blades 2 and adjust the blade angle of the blades 2.

[0033] like Figure 1 As shown, the back plate 1 is a circular plate structure, which can be installed on the oven box. A positioning hole 11 is provided at the center of the back plate 1. The positioning hole 11 is in a half-moon shape. Through the half-moon-shaped positioning hole 11, the back plate 1 can be fixed to the output end of the motor, thereby realizing that the motor drives the back plate 1 and the blades 2 thereon to rotate. Of course, it can be understood that the shape of the positioning hole 11 can also be a non-circular shape such as a rectangle to meet the requirement that the output end of the motor drives the back plate 1 to rotate.

[0034] The blades 2 are provided in a plurality, and the plurality of blades 2 are evenly distributed and rotatably mounted on the back plate 1, such as Figure 2 As shown, each blade 2 includes two connected arc plates 21, the two arc plates 21 are symmetrically arranged relative to the rotation axis of the blade 2, and the concave surfaces of the two arc plates 21 are the windward surfaces. Through the above-mentioned structural arrangement, when the motor drives the back plate 1 to rotate, the concave surfaces of the two arc plates 21 serve as the windward surfaces, which can generate a larger amount of air. Moreover, by symmetrically arranging the two arc plates 21 relative to the rotation axis, when the motor drives the back plate 1 to rotate, the blade 2 will rotate around its own axis driven by the back plate 1, and make the concave surface of the arc plate 21 the windward surface. Moreover, when the motor rotates forward and reverse, the blade 2 will also rotate, so that the concave surface of the arc plate 21 is always the windward surface. This ensures that no vortex will be generated when the entire fan blade structure rotates, and the structure of the two symmetrically arranged arc plates 21 also makes the fan blade structure generate the same amount of air when rotating forward and reversely.

[0035] Furthermore, if Figure 2 As shown, a guide surface 22 is formed at the connection position (that is, the rotation axis) of the two arc-shaped plates 21 of the blade 2, so that when the fan blade structure is driven to rotate by the motor, the flow of the fluid can be smoother.

[0036] In this embodiment, it is understandable that the blade 2 may also include an even number of more than two arc plates 21, in which case the rotation axis of the blade 2 is at the exact center, that is, the number of arc plates 21 on both sides of the rotation axis of the blade 2 is the same.

[0037] The above-mentioned blades 2 are preferably an even number. The setting of an even number of blades 2 can make the flow field streamlines of the fan blade structure more consistent during forward and reverse rotation, thereby generating a more uniform distribution of air volume, thereby achieving a better baking effect of the oven.

[0038] In this embodiment, the rotation of the blade 2 relative to the back plate 1 can be achieved by the following structure: Figure 2 As shown, a blade shaft 4 can be fixed at the bottom of the blade 2, and the blade shaft 4 is rotatably mounted on the back plate 1, and the symmetry center of the two arc plates 21 coincides with the axis of the blade shaft 4, and then the rotation of the blade 2 relative to the back plate 1 is realized through the blade shaft 4. Of course, the blade shaft 4 can also be fixed on the back plate 1, and the blade 2 is rotatably mounted on the blade shaft 4, and the symmetry center of the two arc plates 21 coincides with the axis of the blade shaft 4. In this way, the rotation of the blade 2 relative to the back plate 1 can also be realized.

[0039] Preferably, the fan blade structure of this embodiment also includes a bearing (not shown in the figure), in which case an axial hole (not shown in the figure) may be opened at the bottom of the blade 2, the bearing is installed in the axial hole, and the inner ring of the bearing is fixedly sleeved on one end of the fan blade shaft 4 connected to the blade 2. By providing the bearing, the rotation between the blade 2 and the back plate 1 can be smoother, and the noise generated by the fan blade structure during the forward and reverse conversion can be reduced, thereby increasing the smoothness of the forward and reverse conversion of the blade 2. Furthermore, the bearing may be a ball bearing, the ball of which protrudes from the end face of the inner ring and rolls on the back plate 1. The arrangement of this structure can convert the sliding friction between the blade 2 and the back plate 1 into rolling friction, thereby further improving the smoothness of the forward and reverse conversion of the blade 2.

[0040] like Figure 1 As shown, the positioning member 3 of this embodiment is fixed on the back plate 1, and the positioning member 3 is configured to limit the rotation of the blade 2 and adjust the blade angle of the blade 2. Specifically, when the blade 2 rotates, its concave surface will contact the positioning member 3 and be restricted from rotating by the positioning member 3. When the width of the positioning member 3 changes, the blade angle of the above-mentioned blade 2 will also change to meet the requirements of different air volumes. In this embodiment, the above-mentioned blade angle specifically refers to the angle between the section of the arc plate 21 and the vertical plane passing through the center line of the back plate 1. By changing the value of this angle, the distribution of the air volume can be further adjusted.

[0041] For example, the positioning member 3 is disposed between the rotation axis and the center of the back plate 1, and the positioning member 3 is located on the concave side of the arc plate 21. By setting this structure, it is possible to ensure that the positioning member 3 better limits the position of the blade 2. Moreover, the concave surface of the arc plate 21 contacts the positioning member 3, which can better realize the forward and reverse rotation of the blade 2.

[0042] The positioning member 3 may be a rectangular plate-shaped structure, which can limit the rotation of the blade 2 when the blade 2 rotates to contact it. The height of the positioning member 3 is less than the height of the blade 2, so as not to affect the circulation of the fluid. Preferably, the height of the positioning member 3 is one fifth to one third of the height of the blade 2.

[0043] In this embodiment, the line pointing to the arc plate 21 in the projection of the positioning member 3 on the back plate 1 is defined as the first projection line, and the perpendicular bisector of the first projection line passes through the center of the back plate 1. The arrangement of this structure can better achieve the limiting of the blade 2. When the concave surface of the blade 2 contacts the positioning member 3, the end of the positioning member 3 contacts the concave surface, thereby positioning the blade 2.

[0044] When the fan blade structure of this embodiment is driven by the motor to rotate forward (i.e., clockwise), the state of the blade 2 is as follows: Figure 3 When driven by the motor to reverse (i.e., rotate counterclockwise), the state of blade 2 is as follows Figure 4 It can be seen that the fan blade structure of this embodiment, whether it is forward or reverse rotation, the concave surfaces of the two arc plates 21 are both windward surfaces, and no vortex will be generated during forward or reverse rotation, which can ensure that the fan blade structure generates the same amount of air during forward and reverse rotation.

[0045] The present invention also provides an oven, which includes the above-mentioned fan blade structure. The back plate 1 of the fan blade structure can be installed on the side wall of the oven body. Through the fan blade structure, the temperature distribution of the oven can be more uniform when baking food.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fan blade structure, characterized in that: include: Back panel (1); A blade (2) is rotatably mounted on the back plate (1), the blade (2) comprising two arc-shaped plates (21) connected to each other and symmetrically arranged relative to the rotation axis of the blade (2), the concave surfaces of the two arc-shaped plates (21) being windward surfaces; A positioning member (3) is fixed on the back plate (1), and the positioning member (3) is configured to limit the rotation of the blade (2) and adjust the blade angle of the blade (2), wherein the blade angle is the angle between the section of the arc plate (21) and a vertical plane passing through the center line of the back plate (1); The positioning member (3) is only arranged between the rotation axis and the center of the back plate (1), and the positioning member (3) is located on the concave side of the arc plate (21); A guide surface (22) is formed at the connection position of the two arc-shaped plates (21).

2. The fan blade structure according to claim 1, characterized in that: A line of the positioning member (3) pointing to the arc-shaped plate (21) in the projection of the back plate (1) is defined as a first projection line, and a perpendicular bisector (31) of the first projection line passes through the center of the back plate (1).

3. The fan blade structure according to claim 1, characterized in that: The height of the positioning member (3) is smaller than the height of the blade (2).

4. The fan blade structure according to claim 1, characterized in that: A blade shaft (4) is fixedly provided at the bottom of the blade (2), and the blade shaft (4) is rotatably mounted on the back plate (1), and the symmetry centers of the two arc-shaped plates (21) coincide with the axis center of the blade shaft (4).

5. The fan blade structure according to claim 1, characterized in that: A fan shaft (4) is fixedly provided on the back plate (1), and the blades (2) are rotatably mounted on the fan shaft (4). The symmetry centers of the two arc-shaped plates (21) coincide with the axis center of the fan shaft (4).

6. The fan blade structure according to claim 4 or 5, characterized in that: An axial hole is provided at the bottom of the blade (2), a bearing is installed in the axial hole, and the fan blade shaft (4) is fixedly inserted into the inner ring of the bearing.

7. The fan blade structure according to claim 6, characterized in that: The bearing is a ball bearing, and the balls of the ball bearing protrude from the end surface of the inner ring and roll on the back plate (1).

8. The fan blade structure according to claim 1, characterized in that: A positioning hole (11) is provided at the center of the back plate (1), and the positioning hole (11) is in a half-moon shape.

9. An oven, characterized in that: It comprises the fan blade structure described in any one of claims 1-8.

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