A food processor

Abstract

The utility model belongs to kitchen appliance technical field discloses a kind of food processing machines, including host computer and comminution cup, comminution cup is arranged comminution knife, host computer includes brushless motor and casing, brushless motor includes shaft, rotor, stator, mounting bracket, mounting bracket is fixedly connected with casing, mounting bracket is provided with mounting hole and integrally formed mounting portion, the upper end of shaft passes through from mounting hole to be drivingly connected with comminution knife, fixedly provided with the locating bearing of the sleeve in the outer periphery of shaft in mounting hole, rotor is hoisted and fixed in mounting hole by shaft and locating bearing, and the lower end of rotor is suspended to form rotor free end, the top of stator and mounting portion abut and fixed, the lower end of stator forms stator free end.The lower end of the brushless motor of the application is open type, simple structure, reduce the hindrance suffered by heat dissipation, to improve the temperature rise of brushless motor.Stator and rotor are assembled with mounting bracket as unified installation datum, reduce assembly tolerance, more stable operation, reduce working noise.

Description

Technical Field

[0001] This utility model belongs to the field of kitchen appliance technology, specifically relating to a food processing machine. Background Technology

[0002] Existing food processing machines, such as high-speed blenders, typically consist of a main unit and a mixing cup mounted on top of the main unit. To reduce the weight of the mixing cup and make it easier for users to disassemble and assemble it, the motor is usually installed inside the main unit.

[0003] The applicant previously filed patent CN114903356B, which provides a flattened food processing machine that uses a brushless motor instead of a series-wound motor, achieving a reduction in motor height while maintaining the same total coil length. The motor includes an upper bracket and a lower bracket forming the upper and lower end faces of the motor. The brackets completely cover the stator radially, and the upper and lower brackets axially fix the separate stator and rotor into a complete motor.

[0004] While the brushless motor, fixed inside the main unit, can reduce the overall height compared to a series-wound motor, the cumulative height of the upper bracket, lower bracket, and main unit casing still necessitates further reduction in height, and the main unit suffers from poor heat dissipation. During further research, the applicant further reduced the main unit's height by exposing the upper bracket from the top of the main unit to form the top surface; however, the heat dissipation problem remains unresolved.

[0005] Specifically, since the coils of a motor generate heat during operation, heat dissipation is necessary to maintain the motor's lifespan. However, in existing brushless motors, both the upper and lower supports completely cover the stator radially, making it difficult for heat from the stator and coils to dissipate spontaneously. This is especially problematic in food processors with detachable cups, where heat dissipation is hindered by the supports and the main casing, resulting in poor heat dissipation efficiency. Even with additional ventilation holes in the upper and lower supports to allow airflow and remove heat from the stator and coils, there is a trade-off between heat dissipation efficiency and structural strength. This limits the area of ​​the ventilation holes in the upper and lower supports and necessitates the use of complex cooling fan structures, leading to a complex structure and ineffective heat dissipation. Utility Model Content

[0006] This invention provides a food processing machine that solves the problem of poor heat dissipation in existing motors while further simplifying the motor structure and reducing the height of the main unit.

[0007] The technical solution adopted in this utility model is as follows:

[0008] This utility model provides a food processing machine, including a main unit and a detachable grinding cup mounted on top of the main unit. The grinding cup contains grinding blades. The main unit includes a brushless motor and a housing accommodating the brushless motor. The brushless motor includes a rotating shaft, a rotor fixed to the outer circumference of the rotating shaft, a stator surrounding the outer circumference of the rotor, and a mounting bracket fixed above the stator. The mounting bracket is fixedly connected to the housing and has mounting holes and an integrally formed mounting portion. The upper end of the rotating shaft passes through the mounting holes for transmission connection with the grinding blades. A positioning bearing is fixedly installed within the mounting holes and sleeved on the outer circumference of the rotating shaft. The rotor is suspended and fixed to the mounting holes via the rotating shaft and the positioning bearing, with the lower end of the rotor suspended to form a free end. The top end of the stator abuts against and is fixed to the mounting portion, and the lower end of the stator forms a free end.

[0009] The food processing machine provided by this utility model suspends the rotor in the mounting hole using a rotating shaft and positioning bearing. The lower end of the rotor is suspended, forming a free end, while the top end of the stator abuts against and is fixed to the mounting part, forming a free end. Therefore, the rotor and stator do not require the axial positioning achieved by the traditional lower support structure. For the brushless motor, this eliminates the need for a lower support structure, simplifying the structure and reducing its height, while ensuring reliable positioning of the rotor and stator. Furthermore, the free ends of the rotor and stator make the lower end of the brushless motor open, allowing heat from the coils to dissipate in all directions during operation, reducing obstacles to heat dissipation and improving the temperature rise of the brushless motor. Since the heat of the brushless motor does not concentrate, the temperature rise is small. This structure can even eliminate the need for a fan for cooling, simplifying the brushless motor, reducing the operating load, further improving temperature rise and heat dissipation, and also improving the dynamic balance of the brushless motor. In addition, the mounting bracket is provided with mounting holes and an integrally formed mounting part. The rotor is hoisted and fixed in the mounting holes, and the stator abuts against and is fixed to the mounting part. Therefore, it is equivalent to assembling the stator and rotor of the brushless motor using the mounting bracket as a unified mounting reference, reducing the assembly tolerance of the rotor and stator, making the air gap between the stator and rotor uniform, the torque fluctuation of the rotor and shaft small, and the operation more stable. The lower end of the rotor forms the rotor free end, and the lower end of the stator forms the stator free end, thereby reducing resonance during operation, further improving the running smoothness of the brushless motor, and reducing working noise.

[0010] In a preferred embodiment, the mounting bracket is suspended and fixed to the top wall of the housing, the stator is suspended to the mounting bracket by fixing nails, and the free end of the stator is suspended in the inner cavity of the housing.

[0011] By using fixing nails to suspend the stator on the mounting bracket, the stator and the mounting bracket are reliably fixed. At the same time, the free end of the stator is suspended, which further improves the open heat dissipation effect of the stator, effectively prevents heat from concentrating and being difficult to dissipate, and thus helps to improve the temperature rise of the motor. Even without a fan, the brushless motor can still maintain good heat dissipation, simplify the main unit structure, and reduce the resonance noise of the stator.

[0012] In a preferred embodiment, the top end of the fixing pin is fixedly inserted into the mounting portion, the bottom end of the fixing pin is provided with a fixing head that is radially enlarged to support the stator, the fixing pin is also fitted with a support washer, the support washer is located above the fixing head and is enlarged relative to the outer diameter of the fixing head, and the fixing head supports the stator through the support washer.

[0013] By setting fixing pins, a simple structure is used to reliably fix the stator and the mounting bracket. By adding support pads to the fixing pins, the support area for the stator is increased, thereby improving the stability of the stator support. Thus, even without a traditional lower end cover, the stator and the mounting bracket can still be reliably axially fixed.

[0014] In a preferred embodiment, the mounting portion includes a step, the step including a step surface that abuts against the top of the stator and a limiting surface that limits the stator side.

[0015] By setting steps, the stator is axially limited by the step surface abutting against the top of the stator, and radially limited by the limiting surface on the side of the stator. This allows the stator to form a more comprehensive limiting position with the mounting bracket through the mounting part, ensuring precise fixing of the stator and the mounting bracket, reducing assembly errors of the stator and rotor, and improving the operational stability of the brushless motor.

[0016] In a preferred embodiment, the mounting bracket is fixedly connected to the bottom wall of the housing by a support column provided on the side of the stator. The bottom wall of the housing is integrally provided with a support rib, which abuts against the free end of the stator to axially clamp the stator with the mounting part.

[0017] The mounting bracket is fixed to the bottom wall of the housing by means of the support columns, thus achieving a fixed connection between the mounting bracket and the bottom wall of the housing. At the same time, the bottom wall of the housing is also provided with support ribs to abut and limit the stator free end, thereby achieving axial clamping of the stator. Therefore, under the premise of open heat dissipation inside the housing, the installation stability of the stator and the housing is further enhanced, making the installation of the brushless motor stable and achieving stable rotation of the rotor.

[0018] In a preferred embodiment, the mounting bracket is integrally provided with an extension wall extending downward to the outer periphery of the stator, the extension wall is provided with an anti-rotation groove, and the outer periphery of the stator is provided with an anti-rotation rib that is inserted into the anti-rotation groove.

[0019] By integrating an extension wall into the mounting bracket, which extends to the outer periphery of the stator, an assembly guide is formed during the assembly process, ensuring precise assembly positioning between the stator and the mounting bracket. Simultaneously, the extension wall is equipped with an anti-rotation groove that cooperates with the anti-rotation rib of the stator to prevent the stator from rotating. Under the premise of eliminating the lower end cover to maximally compress the height of the brushless motor, the stability of the stator fixing structure is guaranteed, achieving smooth operation.

[0020] In a preferred embodiment, the top wall of the housing is provided with an opening, the mounting bracket is suspended and fixed in the opening and exposed from the opening, and the pulverizing cup is supported on the mounting bracket.

[0021] By providing an opening in the top wall of the housing, the mounting bracket is suspended and fixed in the opening and exposed outside the opening. This is equivalent to reducing the stacking of the top wall of the housing along the height direction of the main unit, thus lowering the overall height of the main unit. The grinding cup is supported on the mounting bracket, ensuring the stable installation of the grinding cup.

[0022] In a preferred embodiment, the positioning bearing includes a first bearing and a second bearing arranged sequentially along the axial direction of the rotor shaft, with the second bearing located between the first bearing and the top surface of the rotor.

[0023] By employing a first and a second bearing, the rotor is suspended in the mounting hole using the dual bearings, forming a more reliable axial restraint with the mounting bracket. While bearing the entire weight of the rotor, the dual bearings still provide radial support for smooth rotation of the shaft, ensuring smooth rotor rotation. Simultaneously, the dual bearings expand the restraining area along the shaft axis, thereby increasing the radial straightening effect on the shaft. This reliably limits rotor yaw when the lower end of the rotor is suspended, thus ensuring stable rotor rotation while further reducing the height of the brushless motor.

[0024] In a preferred embodiment, the mounting hole has an inwardly tapering transition plane, the top end of the positioning bearing abuts against the transition plane, and the positioning bearing is interference-fitted to the mounting hole.

[0025] By setting a transition plane in the mounting hole, the axial installation position of the positioning bearing is accurate, preventing the positioning bearing from moving upward after being fixed in the mounting hole. The positioning bearing is interference-fitted to the mounting hole, thus achieving reliable fixing between the positioning bearing and the mounting hole.

[0026] In a preferred embodiment, the mounting bracket is provided with a retaining rib extending toward the rotor to form the mounting hole, the positioning bearing is fixed inside the retaining rib, and the stator is wound with a stator winding that overlaps with the retaining rib in the height direction.

[0027] By setting ribs around the mounting bracket, reliable fixation of the positioning bearing is achieved, providing reliable support for the axial hoisting of the rotor. At the same time, by making the stator winding overlap with the ribs in the height direction, the space formed on the outer periphery of the ribs and above the stator is rationally utilized, so as to make full use of the height of the brushless motor, achieve a compact structure, and reduce the size of the brushless motor.

[0028] In a preferred embodiment, the mounting portion is the bottom surface of the mounting bracket, and the stator is welded or bonded to the mounting portion.

[0029] By directly forming the mounting section on the bottom surface of the mounting bracket, no additional processing of the mounting bracket is required. At the same time, the stator is fixed to the mounting section by welding or bonding, eliminating the need for fixing parts, reducing material usage, and achieving reliable fixation between the stator and the mounting bracket. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0031] Figure 1 This is a schematic diagram of the structure of a food processing machine in one embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of a brushless motor in one embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional structural diagram of a brushless motor in one embodiment of the present invention.

[0034] Figure 4 This is a side view of a brushless motor in one embodiment of the present invention.

[0035] List of components and reference numerals: 10. Crushing cup; 101. Mounting hole; 102. Mounting part; 1021. Step; 103. Surrounding rib; 104. Transition plane; 105. Upper limit protrusion; 106. Lower limit protrusion; 20. Crushing blade; 30. Brushless motor; 31. Rotating shaft; 32. Rotor; 33. Stator; 34. Positioning bearing; 341. First bearing; 342. Second bearing; 35. Mounting bracket; 40. Fixing pin; 41. Fixing head; 50. Support pad; 70. Main unit. Detailed Implementation

[0036] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0038] Furthermore, it should be understood in the description of this utility model that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] like Figure 1-4As shown, in one embodiment, this utility model provides a food processing machine, including a main unit 70 and a granulator cup 10 detachably mounted above the main unit 70. A granulator blade 20 is disposed within the granulator cup 10. The main unit 70 includes a brushless motor 30 and a housing accommodating the brushless motor 30. The brushless motor 30 includes a rotating shaft 31, a rotor 32 fixed to the outer periphery of the rotating shaft 31, a stator 33 surrounding the outer periphery of the rotor 32, and a mounting bracket 35 fixed above the stator 33. The mounting bracket 35 is fixedly connected to the housing. The mounting bracket 35 is provided with mounting holes 101 and an integrally formed mounting part 102. The upper end of the rotating shaft 31 passes through the mounting hole 101 to be connected to the crushing blade 20 for transmission. A positioning bearing 34 is fixedly installed in the mounting hole 101 and sleeved on the outer periphery of the rotating shaft 31. The rotor 32 is hoisted and fixed to the mounting hole 101 through the rotating shaft 31 and the positioning bearing 34, and the lower end of the rotor 32 is suspended to form the rotor free end. The top end of the stator 33 abuts against and is fixed to the mounting part 102, and the lower end of the stator 33 forms the stator free end.

[0042] It should be noted that the lower end of rotor 32 is suspended to form the free end of rotor 32 and the lower end of stator 33 forms the free end of stator 33. This means that the lower ends of rotor 32 and stator 33 are not covered by end caps or other structures. Only stator 33, rotor 32 and mounting bracket 35 are assembled to form a complete brushless motor 30.

[0043] The food processing machine provided by this utility model suspends the rotor 32 in the mounting hole 101 via the rotating shaft 31 and the positioning bearing 34. The lower end of the rotor 32 is suspended, forming the free end of the rotor 32. The top end of the stator 33 abuts against and is fixed to the mounting part 102, and the lower end of the stator 33 forms the free end of the stator 33. Therefore, the rotor 32 and stator 33 do not need to be supported by the lower bracket in the traditional way to achieve axial positioning of the rotor 32 and stator 33. For the brushless motor 30, the lower bracket structure is eliminated, simplifying the structure and reducing the height, while ensuring reliable positioning of the rotor 32 and stator 33. Of course, the free ends of rotor 32 and stator 33 make the lower end of brushless motor 30 open, allowing the heat from the coils to dissipate in all directions during operation, reducing obstacles to heat dissipation and thus improving the temperature rise of brushless motor 30. Since the heat of brushless motor 30 itself does not concentrate and the temperature rise is small, this structure can even eliminate the need for a fan for cooling, simplifying the brushless motor 30 and reducing the operating load, further improving temperature rise and heat dissipation. Simultaneously, it also helps improve the dynamic balance of brushless motor 30. More specifically, the mounting bracket provided by this invention can be a hollow structure, thereby ensuring the assembly strength of the stator and rotor while achieving good heat dissipation. The mounting bracket can consist only of a top plate arranged above the stator, or it can extend to the side of the stator.

[0044] In addition, the mounting bracket 35 is provided with mounting holes 101 and an integrally formed mounting part 102. The rotor 32 is hoisted and fixed in the mounting holes 101, and the stator 33 abuts against and is fixed in the mounting part 102. Therefore, it is equivalent to the stator 33 and rotor 32 of the brushless motor 30 being assembled with the mounting bracket as a unified mounting reference, reducing the assembly tolerance of the rotor 32 and stator 33, making the air gap between the stator 33 and rotor 32 uniform, the torque fluctuation of the rotor 32 and the shaft 31 small, and the operation more stable. The lower end of the rotor 32 forms the free end of the rotor 32, and the lower end of the stator 33 forms the free end of the stator 33, thereby reducing resonance during operation, further improving the running smoothness of the brushless motor 30, and reducing working noise.

[0045] It should be noted that in this utility model, the free end of the stator can be suspended in the air, or it can be supported by the base of the main unit 70, for example:

[0046] In a preferred embodiment, the mounting bracket 35 is hoisted and fixed to the top wall of the housing, and the stator 33 is hoisted to the mounting bracket 35 by fixing nails 40, with the free end of the stator suspended in the inner cavity of the housing.

[0047] More preferably, the free end of the stator is positioned close to the bottom wall of the chassis, meaning that no fans or other obstructions are placed below the stator, thereby minimizing the height of the main unit.

[0048] By using fixing nails 40 to suspend the stator 33 on the mounting bracket 35, the stator 33 is reliably fixed to the mounting bracket 35, while the free end of the stator 33 is suspended, which further improves the open heat dissipation effect of the stator 33, effectively prevents heat from concentrating and being difficult to dissipate, and thus helps to improve the temperature rise of the motor. Even without a fan, the brushless motor 30 can still maintain good heat dissipation, simplify the structure of the host 70, and reduce the resonance noise of the stator 33.

[0049] like Figure 2 , 3 As shown in Figure 4, more preferably, the top end of the fixing pin 40 is fixedly inserted into the mounting part 102, and the bottom end of the fixing pin 40 is provided with a fixing head 41 that is radially expanded to support the stator 33. The fixing pin 40 is also fitted with a support pad 50, which is located above the fixing head 41 and is expanded relative to the outer diameter of the fixing head 41. The fixing head 41 supports the stator 33 through the support pad.

[0050] By setting the fixing pin 40, a simple structure is used to reliably fix the stator 33 to the mounting bracket 35. By sleeve the fixing pin 40 with the support pad 50, the support area of ​​the stator 33 is expanded, thereby improving the stability of the support of the stator 33. Thus, even without the traditional lower end cover, the stator 33 can still be reliably axially fixed to the mounting bracket.

[0051] More specifically, the mounting part 102 is a fixing hole, and the stator 33 is provided with an off-center through hole. The fixing pin 40 passes through the through hole and is fixed to the mounting part 102, and the fixing head 41 is supported on the edge of the through hole; or, the outer peripheral wall of the stator 33 is recessed and provided with a plurality of notches and grooves arranged at intervals along the circumference. The fixing pin 40 is provided corresponding to the notches and grooves and passes through the notches and grooves and is fixed to the mounting part 102, and the fixing head 41 is supported on the edge of the notches and grooves. The fixing pin 40 is such as a screw, pin, or rivet.

[0052] Of course, it should be noted that in this embodiment, the fixing pin passes through the stator from bottom to top and is locked in the fixing hole. In fact, the fixing pin can also pass through the fixing hole from top to bottom and be locked in the stator.

[0053] More preferably, such as Figure 3 As shown, the mounting part 102 also includes a step 1021, which includes a step surface that abuts against the top of the stator 33 and a limiting surface that limits the stator 33 to the side.

[0054] By setting the step 1021, the step 1021 abutting against the top of the stator 33 achieves axial limiting of the stator 33, and the limiting surface on the side of the stator 33 achieves radial limiting of the stator 33. This allows the stator 33 to form a more comprehensive limiting with the mounting bracket through the mounting part 102, ensuring accurate fixing of the stator 33 and the mounting bracket, reducing assembly errors of the stator 33 and the rotor 32, and improving the operational stability of the brushless motor 30.

[0055] In another preferred embodiment of the present invention, the free end of the stator 33 is not suspended. For example, the mounting bracket 35 is fixedly connected to the bottom wall of the housing by a support column provided on the side of the stator 33. The bottom wall of the housing is integrally provided with a support rib, which abuts against the free end of the stator 33 to axially clamp the stator 33 with the mounting part 102.

[0056] The mounting bracket 35 is fixed to the bottom wall of the housing by means of the support column, thus achieving a fixed connection between the mounting bracket 35 and the bottom wall of the housing. At the same time, the bottom wall of the housing is also provided with support ribs to abut and limit the free end of the stator 33, thereby achieving axial clamping of the stator 33. Therefore, under the premise of open heat dissipation inside the housing, the installation stability of the stator 33 and the housing is further enhanced, making the installation of the brushless motor 30 stable and achieving stable rotation of the rotor 32.

[0057] Of course, it is understandable that the bottom wall of the casing can be used to support the free end of the stator, thereby supporting the bottom of the stator.

[0058] The present invention is not limited to the above-mentioned one in terms of the specific structure of the mounting part 102 and the fixing method of the stator 33 to the mounting part 102. In another preferred embodiment, the mounting part 102 is the bottom surface of the mounting bracket 35, and the stator 33 is welded or bonded to the mounting part 102.

[0059] By directly forming the mounting part 102 on the bottom surface of the mounting bracket 35, no additional processing of the mounting bracket 35 is required. At the same time, the stator 33 is fixed to the mounting part 102 by welding or bonding, eliminating the need for fixing parts, reducing material usage, and achieving reliable fixing of the stator 33 and the mounting bracket 35.

[0060] In a preferred embodiment, the mounting bracket 35 is integrally provided with an extension wall extending downward to the outer periphery of the stator 33, the extension wall is provided with an anti-rotation groove, and the outer periphery of the stator 33 is provided with an anti-rotation rib that is inserted into the anti-rotation groove.

[0061] By integrating an extension wall into the mounting bracket 35, which extends to the outer periphery of the stator 33, an assembly guide is formed during the assembly process, ensuring precise assembly positioning between the stator 33 and the mounting bracket 35. At the same time, the extension wall is provided with an anti-rotation groove that cooperates with the anti-rotation rib of the stator 33 to prevent the stator 33 from rotating. Under the premise of eliminating the lower end cover to maximize the compression of the height of the brushless motor 30, the stability of the fixed structure of the stator 33 is ensured, and smooth operation is achieved.

[0062] To further reduce the height of the main unit 70, in a preferred embodiment of this invention, the top wall of the casing is provided with an opening, the mounting bracket 35 is hoisted and fixed in the opening and exposed from the opening, and the crushing cup 10 is supported on the mounting bracket 35.

[0063] By setting an opening in the top wall of the housing, the mounting bracket 35 is hoisted and fixed in the opening and exposed from the opening. This is equivalent to reducing the stacking of the top wall of the housing along the height direction of the main unit 70, thus lowering the overall height of the main unit 70. The crushing cup 10 is supported on the mounting bracket 35, ensuring the stable installation of the crushing cup 10.

[0064] It should be noted that the present invention does not limit the fixing method of the rotor 32. For example, in a preferred embodiment, the positioning bearing 34 includes a first bearing 341 and a second bearing 342 arranged sequentially along the axial direction of the rotating shaft 31, and the second bearing 342 is located between the first bearing 341 and the top surface of the rotor 32.

[0065] By employing a first bearing 341 and a second bearing 342, the rotor 32 is suspended in the mounting hole 101 by the dual bearings, forming a more reliable axial limit with the mounting bracket. While bearing the entire weight of the rotor 32, the dual bearings still provide radial support for the smooth rotation of the shaft 31, enabling smooth rotation of the rotor 32. Simultaneously, the dual bearings expand the limiting area along the axial direction of the shaft 31, thereby increasing the radial straightening effect on the shaft 31. This reliably limits the sway of the rotor 32 when its lower end is suspended, thus ensuring stable rotation of the rotor 32 while further reducing the height of the brushless motor 30.

[0066] Of course, in other embodiments, the positioning bearing 34 may optionally be a bearing.

[0067] In a preferred embodiment, such as Figure 3 As shown, the mounting hole 101 has an inwardly contracting transition plane 104, the top end of the positioning bearing 34 abuts against the transition plane 104, and the positioning bearing 34 is interference-fitted to the mounting hole 101.

[0068] By providing a transition plane 104 within the mounting hole 101, the axial mounting position of the positioning bearing 34 is accurately determined, preventing the positioning bearing 34 from shifting upwards after being fixed in the mounting hole 101. The positioning bearing 34 is interference-fitted to the mounting hole 101, thus achieving reliable fixing between the positioning bearing 34 and the mounting hole 101.

[0069] In a preferred embodiment, such as Figure 3 As shown, an upper limit protrusion 105 and a lower limit protrusion 106 are provided on the outer periphery of the rotating shaft 31. The upper limit protrusion 105 and the lower limit protrusion 106 abut against the upper and lower ends of the positioning bearing 34, respectively. Preferably, the lower limit protrusion 106 is a boss integrally formed on the rotating shaft 31. By making the lower limit protrusion 106 an integrally formed boss on the rotating shaft 31, the additional assembly process of the lower limit protrusion 106 and the rotating shaft 31 is eliminated, reducing the assembly steps. During the assembly process, the rotating shaft 31 is first inserted into the positioning bearing 34 from bottom to top until the boss abuts against the positioning bearing 34. Then, the upper limit protrusion 105 limits the upper ends of the rotating shaft 31 and the positioning bearing 34 to combine the rotating shaft 31 and the positioning bearing 34 together. Subsequently, the combined positioning bearing 34 is interference-fitted to the mounting hole 101, thus completing the fixation of the entire rotor 32 and the mounting bracket 35, achieving a simplification of the assembly process.

[0070] It is understandable that the upper limit protrusion 105 and the lower limit protrusion 106 can also be a retaining ring or a step 1021. The positioning bearing 34 and the mounting hole 101 can be fixed by means of thread, adhesive, riveting, welding, pin, etc.

[0071] In a preferred embodiment, the mounting bracket 35 is provided with a surrounding rib 103 extending toward the rotor 32 to form a mounting hole 101, the positioning bearing 34 is fixed inside the surrounding rib 103, and the stator 33 is wound with a stator winding, which overlaps with the surrounding rib 103 in the height direction.

[0072] By setting the retaining rib 103 in the mounting bracket 35, the positioning bearing 34 is reliably fixed, providing reliable support for the axial hoisting of the rotor 32. At the same time, by making the stator 33 winding overlap with the retaining rib 103 in the height direction, the space formed on the outer periphery of the retaining rib 103 and above the stator 33 is rationally utilized, so as to make full use of the height of the brushless motor 30, achieve a compact structure, and reduce the volume of the brushless motor 30.

[0073] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0074] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0075] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A food processing machine, comprising a main unit and a detachable grinding cup mounted above the main unit, wherein a grinding blade is disposed within the grinding cup, and the main unit includes a brushless motor and a housing accommodating the brushless motor, characterized in that, The brushless motor includes a rotating shaft, a rotor fixed to the outer circumference of the rotating shaft, a stator surrounding the outer circumference of the rotor, and a mounting bracket fixed above the stator. The mounting bracket is fixedly connected to the housing. The mounting bracket is provided with mounting holes and an integrally formed mounting part. The upper end of the rotating shaft passes through the mounting holes to be connected to the crushing blade for transmission. A positioning bearing sleeved on the outer circumference of the rotating shaft is fixed in the mounting holes. The rotor is suspended and fixed to the mounting holes through the rotating shaft and the positioning bearing, and the lower end of the rotor is suspended to form a rotor free end. The top end of the stator abuts against and is fixed to the mounting part, and the lower end of the stator forms a stator free end.

2. The food processing machine according to claim 1, characterized in that, The mounting bracket is hoisted and fixed to the top wall of the housing, and the stator is hoisted to the mounting bracket by fixing nails, with the free end of the stator suspended in the inner cavity of the housing.

3. A food processing machine according to claim 2, characterized in that, The top end of the fixing pin is fixedly inserted into the mounting part, and the bottom end of the fixing pin is provided with a fixing head that is radially expanded to support the stator. The fixing pin is also fitted with a support washer, which is located above the fixing head and is expanded relative to the outer diameter of the fixing head. The fixing head supports the stator through the support washer.

4. A food processing machine according to claim 1, characterized in that, The mounting portion includes a step, the step comprising a step surface abutting against the top of the stator and a limiting surface limiting the stator side.

5. A food processing machine according to claim 1, characterized in that, The mounting bracket is fixedly connected to the bottom wall of the housing by a support column provided on the side of the stator. The bottom wall of the housing is integrally provided with a support rib, which abuts against the free end of the stator to axially clamp the stator with the mounting part.

6. A food processing machine according to claim 1, characterized in that, The mounting bracket is integrally provided with an extension wall extending downward to the outer periphery of the stator. The extension wall is provided with an anti-rotation groove, and the outer periphery of the stator is provided with an anti-rotation rib that is inserted into the anti-rotation groove.

7. A food processing machine according to claim 1, characterized in that, The top wall of the housing is provided with an opening, the mounting bracket is hoisted and fixed in the opening and exposed from the opening, and the crushing cup is supported on the mounting bracket.

8. A food processing machine according to claim 1, characterized in that, The positioning bearing includes a first bearing and a second bearing arranged sequentially along the axial direction of the rotor shaft, with the second bearing located between the first bearing and the top surface of the rotor. Alternatively, the mounting hole may have an inwardly tapering transition plane, the top end of the positioning bearing may abut against the transition plane, and the positioning bearing may be interference-fitted to the mounting hole.

9. A food processing machine according to claim 1, characterized in that, The mounting bracket is provided with a retaining rib extending toward the rotor to form the mounting hole. The positioning bearing is fixed inside the retaining rib. The stator is wound with a stator winding, which overlaps with the retaining rib in the height direction.

10. A food processing machine according to claim 1, characterized in that, The mounting part is the bottom surface of the mounting frame, and the stator is welded or bonded to the mounting part.

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