Fan assembly for kitchen appliance and kitchen appliance having the same

Abstract

The present invention discloses a fan assembly for kitchen appliances and the kitchen appliance. The fan assembly comprises: a fan and a motor assembly, wherein the fan comprises a hub and blades, the hub is formed as a hollow structure, and the blades are arranged on the outer peripheral surface of the hub; the motor assembly comprises a motor and a motor seat, the motor is arranged on the motor seat, and at least a part of the motor extends into the hub. According to the fan assembly for kitchen appliances of the embodiment of the present invention, by setting the hub as a hollow structure, at least a part of the structure of the motor is cleverly hidden in the hub, thereby greatly reducing the overall thickness and size of the fan assembly, making the structure of the fan more compact, thereby reducing the space occupied by the fan assembly in the heat dissipation channel, reducing the flow channel resistance, improving the heat dissipation effect of the fan assembly and facilitating reducing the noise of the fan assembly.

Description

Technical Field

[0001] The invention relates to the field of kitchen appliances, and in particular to a fan assembly for a kitchen appliance and a kitchen appliance having the fan assembly. Background Art

[0002] Kitchen appliances (such as microwave ovens, microwave-steamers, microwave ovens and microwave-steamers) are usually equipped with fan assemblies to dissipate heat for magnetrons, transformers (inverters) and other electronic components. However, the fan assemblies in the related art are large in size and will block part of the heat dissipation channels, resulting in poor heat dissipation effect and high noise. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a fan assembly for a kitchen appliance, which has a small overall size, low noise and good heat dissipation effect.

[0004] The present invention also provides a kitchen appliance having the fan assembly.

[0005] According to an embodiment of the first aspect of the present invention, a fan assembly for a kitchen appliance includes: a fan, the fan including a hub and fan blades, the hub is formed as a hollow structure, and the fan blades are arranged on the outer peripheral surface of the hub; a motor assembly, the motor assembly includes a motor and a motor base, the motor is arranged on the motor base, and at least a portion of the motor extends into the hub.

[0006] According to the fan assembly for kitchen appliances of the embodiment of the present invention, by setting the hub as a hollow structure, at least a part of the structure of the motor is cleverly hidden in the hub, thereby greatly reducing the overall thickness and size of the fan assembly, making the fan structure more compact, thereby reducing the space occupied by the fan assembly in the heat dissipation channel, reducing the flow channel resistance, improving the heat dissipation effect of the fan assembly and facilitating reducing the noise of the fan assembly.

[0007] According to some embodiments of the present invention, the motor is a DC motor, which includes a stator assembly and a rotor assembly. The stator assembly includes an iron core and a coil, the coil is wound around the iron core, and the iron core is fixed on the motor base. The rotor assembly includes a magnetic ring and a rotor shaft, the magnetic ring is sleeved outside the iron core and the coil, and the magnetic ring is fixed in the wheel hub, the rotor shaft is passed through the iron core, and one axial end of the rotor shaft is fixed on the wheel hub.

[0008] According to some embodiments of the present invention, the rotor assembly further includes a magnetic ring cover, the magnetic ring is fixed inside the magnetic ring cover, and the magnetic ring cover is fixed on the inner circumferential wall of the hub.

[0009] According to some embodiments of the present invention, the magnetic ring cover is interference fit with the wheel hub.

[0010] According to some embodiments of the present invention, a limiting protrusion is provided on the inner peripheral wall of the hub, and the limiting protrusion is suitable for abutting and fitting with the outer peripheral wall of the magnetic ring cover.

[0011] According to some embodiments of the present invention, a limit buckle is provided on the motor base, and the limit buckle includes a fixing portion and a buckle head, the fixing portion is connected to the motor base, the buckle head is connected to one end of the fixing portion, and an annular limit flange is provided at one end of the magnetic ring cover adjacent to the motor base, and when the fan moves along the axial direction of the rotor shaft, the buckle head stops against the limit flange.

[0012] According to some embodiments of the present invention, the limiting flange is provided with an avoidance notch corresponding to the limiting buckle, and when the buckle head is opposite to the avoidance notch, the buckle head can pass from one side of the avoidance notch to the other side of the avoidance notch.

[0013] According to some embodiments of the present invention, the size of the buckle in the circumferential direction of the motor seat is 2 to 5 mm larger than the size of the avoidance gap in the circumferential direction of the magnetic ring cover.

[0014] According to some embodiments of the present invention, there are two limit buckles, and the two limit buckles are symmetrical with respect to the central axis of the motor.

[0015] According to some embodiments of the present invention, a fan bracket is further included, and the motor base is connected to the fan bracket.

[0016] According to some embodiments of the present invention, the motor base and the fan bracket are integrally formed.

[0017] According to some embodiments of the present invention, the motor base is detachably connected to the fan bracket.

[0018] A kitchen appliance according to an embodiment of a second aspect of the present invention comprises the fan assembly according to the embodiment of the first aspect of the present invention.

[0019] According to the kitchen appliance of the second embodiment of the present invention, by providing the fan assembly according to the first embodiment of the present invention,

[0020] According to some embodiments of the present invention, the kitchen appliance is a microwave oven, a microwave-steamer, a microwave-oven or a microwave-steamer-oven.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is an exploded view of a fan assembly according to an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of assembling a fan, a magnetic ring and a magnetic ring cover according to an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of assembling a motor base and a magnetic ring cover according to an embodiment of the present invention;

[0026] Figure 4 yes Figure 3 A top view of the motor base and magnetic ring cover shown in;

[0027] Figure 5 is an exploded view of a fan bracket and a motor base according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] The fan assembly 100,

[0030] Fan 1, hub 11, bottom wall 111, peripheral wall 112, limiting protrusion 113, fan blade 12,

[0031] Iron core 21, shaft hole 211, magnetic ring 22, rotor shaft 23, magnetic ring cover 24, limit flange 241, avoidance gap 241a, motor seat 25, limit buckle 251, fixing part 251a, buckle head 251b, flange 252, single chip computer 26, oil-containing bearing 27,

[0032] Fan bracket 3, screw holes 31, supporting feet 32. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] The fan assembly 100 for a kitchen appliance according to an embodiment of the present invention is described below with reference to the accompanying drawings. The kitchen appliance may be a microwave oven, a microwave-steamer, a microwave-baker or a microwave-steamer-baker. The fan assembly 100 may be mounted on the back panel of the kitchen appliance to dissipate heat from a magnetron, a transformer (inverter) and other electronic components.

[0035] like Figure 1As shown, a fan assembly 100 for a kitchen appliance according to an embodiment of the present invention includes: a fan 1 and a motor assembly.

[0036] Specifically, the fan 1 includes a hub 11 and blades 12. The hub 11 is formed as a hollow structure, and the blades 12 are arranged on the outer circumference of the hub 11. Figure 1 and Figure 2 , the hub 11 can be formed as a hollow cylindrical structure, and one end of the hub 11 is open. Among them, the hub 11 may include a bottom wall 111 and a peripheral wall 112, the peripheral wall 112 surrounds the outer periphery of the bottom wall 111, and a receiving space is defined between the peripheral wall 112 and the bottom wall 111. The fan blade 12 can be one or more. It should be noted that "multiple" in this application refers to two or more. Among them, when there are multiple fan blades 12, the multiple fan blades 12 can be spaced apart in the circumferential direction of the hub 11.

[0037] The motor assembly includes a motor and a motor seat 25, the motor is arranged on the motor seat 25, and at least a part of the motor extends into the wheel hub 11. In other words, a part of the structure of the motor can be extended into the wheel hub 11, or the entire structure of the motor can be extended into the wheel hub 11. Thus, at least a part of the structure of the motor can be hidden in the wheel hub 11, which greatly reduces the overall thickness of the fan assembly 100, makes the structure of the fan 1 more compact, and has a smaller size, thereby reducing the space occupied by the fan assembly 100 in the heat dissipation channel, improving the heat dissipation effect and helping to reduce the noise of the fan assembly 100.

[0038] According to the fan assembly 100 for kitchen appliances according to the embodiment of the present invention, by setting the hub 11 as a hollow structure, at least a part of the structure of the motor is cleverly hidden in the hub 11, thereby greatly reducing the overall thickness and size of the fan assembly 100, making the structure of the fan 1 more compact, thereby reducing the space occupied by the fan assembly 100 in the heat dissipation channel, reducing the flow channel resistance, improving the heat dissipation effect of the fan assembly 100 and helping to reduce the noise of the fan assembly 100.

[0039] According to some embodiments of the present invention, the motor is a DC motor. For example, the motor can be a brushless DC motor. The DC motor has a stable speed, a small speed fluctuation range, and is easy to control. Therefore, the rated speed does not need to have too much margin like the shaded pole motor, which is conducive to reducing the noise of the fan assembly 100. In addition, the DC motor is small in size and can be directly installed in the hub 11 in a hidden manner, which greatly reduces the flow channel resistance. Therefore, while ensuring the same heat dissipation effect, the speed of the motor can be further reduced, thereby further reducing the noise of the fan assembly 100.

[0040] The inventor of the present application has studied and found that to achieve the same heat dissipation effect, the shaded pole motor requires 2600RPM and a sound power level of 58dB, while the DC motor only requires 2350RPM and a sound power level of 55dB. The use of a DC motor can significantly reduce noise and consume less energy.

[0041] Specifically, the motor includes a stator assembly and a rotor assembly. The stator assembly includes an iron core 21 and a coil (not shown). The coil is wound around the iron core 21, and the iron core 21 is fixed to the motor base 25. There may be multiple coils, and the iron core 21 may be fixed to the motor base 25 by hot melt adhesive. The rotor assembly includes a magnetic ring 22 and a rotor shaft 23. The magnetic ring 22 is sleeved outside the iron core 21 and the coil, and the magnetic ring 22 is fixed in the wheel hub 11. The rotor shaft 23 is inserted into the iron core 21, and one axial end of the rotor shaft 23 is fixed to the wheel hub 11.

[0042] Reference Figure 1 , Figure 3 and Figure 4 The iron core 21 is provided with an axial hole 211, and the rotor shaft 23 is inserted into the axial hole 211. For example, one axial end of the rotor shaft 23 can be fixed to the bottom wall 111 of the hub 11, and the magnetic ring 22 can be fixed to the inner circumferential wall of the hub 11. Thus, the magnetic ring 22, the rotor shaft 23, the iron core 21 and the coil can be installed in a hidden manner in the hub 11, which reduces the overall size of the fan assembly 100, has a simple structure, and is easy to assemble.

[0043] It can be understood that the motor also includes a single-chip microcomputer 26 (such as a chip), which can be used to control the on and off of each coil to change the magnetic field generated by the coil. The magnetic ring 22 (i.e., the permanent magnet) rotates relative to the iron core 21 under the action of the Lorentz force. Since the magnetic ring 22 is fixed in the wheel hub 11, when the magnetic ring 22 rotates, the fan 1 rotates with the magnetic ring 22, and the heat dissipation function can be achieved through the fan assembly 100.

[0044] In some embodiments of the present invention, an oil bearing 27 is disposed on the outer sleeve of the rotor shaft 23. The oil bearing 27 can reduce the friction force of the rotation of the rotor shaft 23, and further reduce the noise of the fan assembly 100.

[0045] Optionally, the oil bearing 27, the rotor shaft 23 and the iron core 21 are concentrically assembled. That is, the central axis of the oil bearing 27, the central axis of the rotor shaft 23 and the central axis of the iron core 21 coincide with each other. Thus, the stability of the motor operation can be improved.

[0046] According to some embodiments of the present invention, the rotor assembly further comprises a magnetic ring cover 24, the magnetic ring 22 is fixed inside the magnetic ring cover 24, and the magnetic ring cover 24 is fixed on the inner circumferential wall of the hub 11. Figure 2 and Figure 3The magnetic ring cover 24 is arranged on the outside of the magnetic ring 22. During assembly, the magnetic ring 22 can be fixed in the wheel hub 11 through the magnetic ring cover 24. For example, the magnetic ring 22 can be bonded to the inner wall surface of the magnetic ring cover 24, and then the magnetic ring cover 24 and the magnetic ring 22 can be integrally assembled into the wheel hub 11. The magnetic ring cover 24 can play a role in protecting the magnetic ring 22. Therefore, by providing the magnetic ring cover 24 and fixing the magnetic ring 22 in the wheel hub 11 through the magnetic ring cover 24, it can be avoided that the wheel hub 11 directly squeezes the magnetic ring 22 during the assembly process and damages the magnetic ring 22, thereby effectively protecting the magnetic ring 22 and improving the reliability of the fan assembly 100.

[0047] According to some embodiments of the present invention, the magnetic ring cover 24 is interference fit with the wheel hub 11. Therefore, through the interference fit between the magnetic ring cover 24 and the wheel hub 11, the magnetic ring cover 24 and the wheel hub 11 can be assembled into a whole, so that when the magnetic ring 22 rotates, the fan 1 can be driven to rotate with the magnetic ring 22, thereby improving the rotation stability of the fan assembly 100.

[0048] According to some embodiments of the present invention, a limiting protrusion 113 is provided on the inner peripheral wall of the hub 11, and the limiting protrusion 113 is suitable for abutting against the outer peripheral wall 112 of the magnetic ring cover 24. There may be multiple limiting protrusions 113. Figure 2 , a plurality of limiting protrusions 113 are arranged at intervals in the circumferential direction of the wheel hub 11. Thus, the limiting protrusions 113 and the magnetic ring cover 24 are matched with each other, so that the magnetic ring cover 24 can be firmly fixed in the wheel hub 11, and the difficulty of assembling the magnetic ring cover 24 can be reduced, and the assembly efficiency can be improved.

[0049] According to some embodiments of the present invention, a limit buckle 251 is provided on the motor base 25, and the limit buckle 251 includes a fixed portion 251a and a buckle head 251b, the fixed portion 251a is connected to the motor base 25, and the buckle head 251b is connected to one end of the fixed portion 251a. An annular limit flange 241 is provided at one end of the magnetic ring cover 24 adjacent to the motor base 25, and when the fan 1 moves axially along the rotor shaft 23, the buckle head 251b stops against the limit flange 241.

[0050] For example, refer to Figure 3 The fixing portion 251a can be connected to the outer peripheral surface of the motor base 25, and the buckle head 251b is connected to one end of the fixing portion 251a in the length direction and the buckle head 251b extends toward the direction close to the central axis of the motor base 25. Therefore, by providing the limiting buckle 251 and the limiting flange 241, when the fan 1 rotates at a high speed and moves along the axial direction of the rotor shaft 23, the buckle head 251b and the limiting flange 241 can effectively prevent the fan 1 from slipping off the motor, thereby improving the stability of the fan assembly 100.

[0051] According to some embodiments of the present invention, the limit buckle 251 may be an elastic buckle, and the limit buckle 251 may be configured to move in a direction away from the central axis of the motor base 25 and in a direction close to the central axis of the motor base 25. Therefore, during assembly, the limit buckle 251 may be moved in a direction away from the central axis of the motor base 25 to prevent the limit buckle 251 from interfering with the limit flange 241. After the fan 1 is assembled in place, the limit buckle 251 may be released, and the limit buckle 251 may be automatically reset. Therefore, the assembly difficulty is reduced and the assembly efficiency is improved.

[0052] According to other embodiments of the present invention, the limiting flange 241 is provided with an escape notch 241a corresponding to the limiting buckle 251, and when the buckle head 251b is opposite to the escape notch 241a, the buckle head 251b can pass from one side of the escape notch 241a to the other side of the escape notch 241a. Therefore, during assembly, the buckle head 251b can pass through the escape notch 241a, so that the fan 1 can be assembled to the motor base 25, which reduces the assembly difficulty and improves the assembly efficiency.

[0053] In some embodiments of the present invention, the size of the buckle head 251b in the circumferential direction of the motor base 25 is 2 to 5 mm larger than the size of the avoidance notch 241a in the circumferential direction of the magnetic ring cover 24. During assembly, the fan can be assembled to the motor base 25 after being tilted to a certain angle. In this way, the assembly of the fan assembly 100 can be ensured, and when the fan 1 rotates to a position where the buckle head 251b and the avoidance notch 241a are relative, if the fan 1 moves along the axial direction of the rotor shaft 23, the buckle head 251b can still be ensured to be in a stop fit with part of the limiting flange 241, thereby preventing the fan 1 from slipping off the motor, and further improving the stability of the operation of the fan assembly 100.

[0054] According to some embodiments of the present invention, there are two limit buckles 251, and the two limit buckles 251 are symmetrical with respect to the central axis of the motor, thereby improving the uniformity of the force applied to the fan 1, thereby improving the running stability of the fan assembly 100.

[0055] According to some embodiments of the present invention, a fan bracket 3 is further included, and the motor base 25 is connected to the fan bracket 3. The fan assembly 100 can be assembled to the back plate of the kitchen appliance through the fan bracket 3, with a simple structure and convenient assembly.

[0056] In some embodiments of the present invention, when the fan assembly 100 is applied to a microwave oven, in order to facilitate the assembly of the microwave oven, the filter device of the microwave oven can be integrated on the fan bracket 3. Specifically, a support foot 32 for supporting the filter device is provided on the top of the fan bracket 3. After the filter device is supported on the support foot 32, the filter device can be fixed to the fan bracket 3 by buckles and screws.

[0057] In some embodiments of the present invention, the motor base 25 and the fan bracket 3 are integrally formed. For example, the motor base 25 and the fan bracket 3 can be integrally injection molded. Thus, the processing technology of the fan assembly 100 can be simplified, the processing efficiency can be improved, and the production cost can be reduced.

[0058] In other embodiments of the present invention, the motor base 25 is detachably connected to the fan bracket 3. Therefore, it is convenient to remove the motor base 25 from the fan bracket 3, thereby facilitating later maintenance and improving the maintainability of the fan assembly 100.

[0059] For example, the motor base 25 and the fan bracket 3 may be detachably connected by screws. Figure 5 The motor base 25 may be provided with a flange 252, a screw column is formed on the flange 252, a screw hole 31 is provided between the fan 1, and the screw passes through the screw hole 31 and the screw column in sequence from the side of the fan bracket 3 away from the motor base 25, so that the electrode base can be fixed on the fan bracket 3. The structure is simple and easy to assemble.

[0060] The kitchen appliance according to the second embodiment of the present invention comprises the fan assembly 100 according to the first embodiment of the present invention. The kitchen appliance is a microwave oven, a microwave-steamer, a microwave-baker or a microwave-steamer-baker. The fan assembly 100 can be installed on the back panel of the kitchen appliance to dissipate heat for a magnetron, a transformer (inverter) and other electronic components.

[0061] According to the kitchen appliance of the second aspect embodiment of the present invention, by setting the fan assembly 100 according to the above-mentioned first aspect embodiment of the invention, the hub 11 is set as a hollow structure, and at least a part of the structure of the motor is cleverly hidden in the hub 11, thereby greatly reducing the overall thickness and size of the fan assembly 100, making the structure of the fan 1 more compact, thereby reducing the space occupied by the fan assembly 100 in the heat dissipation channel, reducing the flow channel resistance, improving the heat dissipation effect of the fan assembly 100 and helping to reduce the noise of the fan assembly 100.

[0062] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "center", "top", "bottom", "axial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] Other structures and operations of the kitchen appliance according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fan assembly for a kitchen appliance, characterized in that: include: A fan, the fan comprising a hub and blades, the hub being formed as a hollow structure, and the blades being arranged on an outer peripheral surface of the hub; A motor assembly, the motor assembly comprising a motor and a motor seat, the motor being arranged on the motor seat, and at least a portion of the motor extending into the wheel hub; The motor includes a rotor assembly; The rotor assembly comprises a magnetic ring cover and a rotor shaft; The magnetic ring cover is interference fit with the wheel hub; The motor seat is provided with a limit buckle, and the limit buckle includes a fixing portion and a buckle head, the fixing portion is connected to the motor seat, and the buckle head is connected to one end of the fixing portion, and an annular limit flange is provided at one end of the magnetic ring cover adjacent to the motor seat, and when the fan moves along the axial direction of the rotor shaft, the buckle head stops against the limit flange; The limiting flange is provided with an avoidance notch corresponding to the limiting buckle, and when the buckle head is opposite to the avoidance notch, the buckle head can pass from one side of the avoidance notch to the other side of the avoidance notch; The size of the buckle in the circumferential direction of the motor seat is 2 to 5 mm larger than the size of the avoidance gap in the circumferential direction of the magnetic ring cover.

2. The fan assembly for a kitchen appliance according to claim 1, characterized in that: The motor is a DC motor, comprising a stator assembly, the stator assembly comprising an iron core and a coil, the coil being wound around the iron core, the iron core being fixed on the motor seat, the rotor assembly comprising a magnetic ring, the magnetic ring being sleeved outside the iron core and the coil, and the magnetic ring being fixed in the wheel hub, the rotor shaft being passed through the iron core, and one axial end of the rotor shaft being fixed on the wheel hub.

3. The fan assembly for a kitchen appliance according to claim 2, characterized in that: The magnetic ring is fixed inside the magnetic ring cover, and the magnetic ring cover is fixed on the inner peripheral wall of the hub.

4. The fan assembly for a kitchen appliance according to claim 1, characterized in that: A limiting protrusion is provided on the inner peripheral wall of the hub, and the limiting protrusion is suitable for abutting and matching with the outer peripheral wall of the magnetic ring cover.

5. The fan assembly for a kitchen appliance according to claim 1, characterized in that: There are two limit buckles, and the two limit buckles are symmetrical relative to the central axis of the motor.

6. The fan assembly for a kitchen appliance according to claim 2, characterized in that: It also includes a fan bracket, and the motor base is connected to the fan bracket.

7. The fan assembly for a kitchen appliance according to claim 6, characterized in that: The motor seat and the fan bracket are integrally formed.

8. The fan assembly for a kitchen appliance according to claim 6, characterized in that: The motor seat is detachably connected to the fan bracket.

9. A kitchen appliance, characterized in that: Comprising a fan assembly according to any one of claims 1-8.

10. The kitchen appliance according to claim 9, characterized in that: The kitchen appliance is a microwave oven, a microwave-steamer, a microwave-baker or a microwave-steamer-baker.

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