A food processor

Abstract

The utility model belongs to kitchen appliance technical field, concretely relates to a food processor, including cup body and brushless motor, the brushless motor includes pivot, rotor, stator, the bottom wall of cup body sets up mounting hole and mounting portion integrated in the bottom wall of cup body, the upper end of pivot passes through mounting hole and connects the comminution knife and extends into cup body, the locating bearing of sheathed in the outer periphery of pivot is fixed in mounting hole, rotor is hoisted in mounting hole through pivot and locating bearing, and the lower end of rotor is suspended and forms rotor free end, the upper end of stator is in contact with mounting portion and is fixed, and the lower end of stator is suspended and forms stator free end. The application realizes host computer flattening and light weight on one hand, on the other hand, the stator and rotor of brushless motor realize assembly with cup body bottom wall as the unified installation datum, reduce rotor and stator assembly tolerance, make that the air gap between stator and rotor is even, and the torque fluctuation of rotor and pivot is small, and operation is more stable.

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] Traditional food processing machines mostly use series-wound motors. A series-wound motor consists of a motor shaft, a rotor that surrounds the motor shaft, a stator that surrounds the rotor, an upper bracket above the stator, and a lower bracket below the stator. The rotor and stator are two separate components. The rotor includes a rotor core and rotor windings, while the stator includes a stator core and stator windings. The rotor core and stator core must be assembled together by the upper and lower brackets to form a complete motor. To increase the motor speed, the axial extension length of each coil needs to be increased, resulting in a relatively large motor height and ultimately a high center of gravity for the food processing machine.

[0003] Based on continuous research in the field of food processing machines, the applicant invented a first-generation brushless motor for use in food processing machines and applied for patent CN114903356B. This invention provides a flattened food processing machine that reduces the motor height while maintaining the same total coil length. The motor includes an upper support and a lower support forming the upper and lower end faces of the motor. The supports completely cover the stator radially, and the axial fixation of the upper and lower supports combines the separate stator and rotor into a complete motor.

[0004] In further research, the applicant further reduced the height of the brushless motor and iterated on it, inventing a second-generation brushless motor, for which patent CN220917252U was applied. In this second-generation brushless motor, the motor is fixed to the cup body as one unit. The motor includes a lower end cover (i.e., a lower support) and a drive assembly disposed between the lower end cover and the heating plate. The drive assembly is axially limited by the lower end cover, and screws are used to fix the lower end cover to the heating plate, thus securing the drive assembly to the bottom of the heating plate and completing the stable assembly of the motor and the cup body. Therefore, by using the bottom wall of the heating plate or the bottom wall of the cup body to form the end plate of the upper end cover (i.e., the upper support) of the motor, the upper end cover is eliminated compared to the previous first-generation brushless motor structure after the motor and heating plate are assembled, further reducing the overall height of the device.

[0005] However, the first and second generation brushless motors used in food processing machines, which were developed under the leadership of the applicant, have already reduced the height of the motor to the limit. Although users have a continuous demand for reducing the height of the motor, the need to assemble the two independent components of the motor rotor and stator is limited, and the installation stability and coaxiality requirements of the motor and heating plate have led to substantial obstacles to further reducing the height of the motor, which are difficult for those skilled in the art to overcome. Utility Model Content

[0006] This utility model provides a food processing machine that solves the technical problem of how to achieve precise and coaxial assembly of the motor to the cup body for stable operation while further reducing the overall height of the machine by improving the motor structure and the assembly method with the cup body.

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

[0008] This utility model provides a food processing machine, including a cup body and a brushless motor fixedly connected to the bottom of the cup body. The brushless motor includes a rotating shaft, a rotor fixed to the outer circumference of the rotating shaft, and a stator surrounding the outer circumference of the rotor. The bottom wall of the cup body is provided with a mounting hole and an integrally formed mounting part on the bottom wall of the cup body. The upper end of the rotating shaft passes through the mounting hole and extends into the cup body and is connected to a pulverizing blade. A positioning bearing sleeved on the outer circumference of the rotating shaft is fixed in the mounting hole. The rotor is suspended in the mounting hole through the rotating shaft and the positioning bearing, and the lower end of the rotor is suspended to form a rotor free end. The upper end of the stator abuts against and is fixed to the mounting part, and the lower end of the stator is suspended to form a stator free end.

[0009] This invention suspends the rotor in the mounting hole using a shaft and positioning bearing, creating a free end at the lower end of the rotor. This eliminates the need for a lower end cover for axial positioning, as is common in traditional brushless motors, thus eliminating the need for a lower end cover while ensuring reliable rotor positioning. The stator's upper end abuts against and is fixed to a mounting portion integrally formed on the bottom wall of the cup body, achieving axial positioning of the stator. Firstly, the bottom wall of the cup body acts as the upper end cover for the brushless motor, eliminating the need for a lower end cover to support the rotor and stator, further reducing the overall height of the brushless motor and achieving a flatter and lighter design. Secondly, since the rotor is confined to the mounting hole and the stator to the mounting portion, the stator and rotor of the brushless motor are assembled using the bottom wall of the cup body as a unified mounting reference, reducing assembly tolerances and improving the fit between the stator and rotor. With a uniform air gap, the rotor and shaft torque fluctuations are small, resulting in more stable operation. The lower end of the rotor forms a rotor free end, and the lower end of the stator is suspended to form a stator free end, thereby reducing resonance during operation, further improving the smoothness of brushless motor operation, and reducing operating noise. At the same time, the lower ends of the stator and rotor are suspended and unobstructed, simplifying the brushless motor structure and forming an open heat dissipation structure at the lower end, improving motor temperature rise. This structure can even eliminate the need for fan cooling, which helps to simplify the brushless motor and reduce the operating load, thus improving the dynamic balance of the brushless motor.

[0010] 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.

[0011] By setting steps, the stator is axially limited by the step face that abuts against the top of the stator, and radially limited by the limiting face that limits the stator on the side of the stator. This allows the stator to form a more comprehensive limit with the bottom wall of the cup body through the mounting part, ensuring precise fixing of the stator and the bottom wall of the cup body, reducing assembly errors of the stator and rotor, and improving the operating stability of the brushless motor.

[0012] In a preferred embodiment, the mounting part includes a fixing hole, the stator is axially fixed to the fixing hole by a fixing nail, the top end of the fixing nail is fixedly inserted into the fixing hole, and the bottom end of the fixing nail is provided with a fixing head that is radially enlarged to support the stator.

[0013] By using fixing pins to axially fix the stator to the fixing hole, the bottom end of the fixing pin is radially expanded to support the fixing head of the stator, thus completing the axial and reliable fixation of the stator to the bottom wall of the cup body. This prevents the stator from loosening and causing deviation in the magnetic field of the rotor, thereby ensuring the stable rotation of the rotor and the shaft. Moreover, using fixing pins reduces the height of the brushless motor while maintaining stable operation. The fixing structure is simple, easy to assemble, and reliable in positioning.

[0014] In a preferred embodiment, the fixing pin is further fitted with a support washer, the support washer being located above the fixing head and being larger than the outer diameter of the fixing head, the fixing head supporting the stator through the support washer.

[0015] By adding support pads to the fixing pins, the support area for the stator is expanded, thereby improving the stability of the stator support. As a result, even without a traditional lower end cover, the stator can still be reliably axially fixed to the bottom wall of the cup.

[0016] In a preferred embodiment, the stator is provided with an off-center through hole, the fixing pin passes through the through hole and is fixed to the mounting part, and the fixing head is supported on the edge of the through hole.

[0017] Alternatively, the outer peripheral wall of the stator is recessed with a plurality of notches and slots arranged at intervals along the circumference, the fixing pin is disposed corresponding to the notches and slots and passes through the notches and slots and is fixed to the mounting part, and the fixing head is supported on the edge of the notches and slots.

[0018] Whether it's an off-center through hole or a notch, the fixing pins axially fix the stator and the bottom wall of the cup, while simultaneously preventing rotation and providing a limiting position for the stator. This achieves reliable multi-directional fixation of the stator and the bottom wall of the cup, improving the stability of the rotor-stator fit. By recessing multiple notches into the outer peripheral wall of the stator, the processing technology of the stator is simplified compared to using through holes. Furthermore, the volume of the stator itself can be fully utilized, providing sufficient space for coil winding while simultaneously providing reliable space for axial fixation of the stator, preventing the stator volume from expanding. This facilitates further miniaturization of brushless motors.

[0019] In a preferred embodiment, the bottom wall of the cup body 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.

[0020] By integrally setting an extension wall on the bottom wall of the cup body, extending to the outer periphery of the stator, an assembly guide is formed during the assembly process, making the stator assembly position accurate. At the same time, the extension wall is provided 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 minimize the height of the brushless motor, the stability of the stator fixing structure is guaranteed, and smooth operation is achieved.

[0021] 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.

[0022] 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 bottom wall of the cup body. 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 restraint area along the shaft axis, thereby increasing the radial alignment effect on the shaft. This reliably limits rotor sway when the lower end of the rotor is suspended, thus ensuring stable rotor rotation while further reducing the height of the brushless motor.

[0023] In a preferred embodiment, the bottom wall of the cup body is provided with a rib extending toward the rotor to form the mounting hole, the positioning bearing is fixed inside the rib, and the stator is wound with a stator winding, the stator winding and the rib overlapping in the height direction.

[0024] By setting ribs on the bottom wall of the cup body, 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.

[0025] In a preferred embodiment, the mounting hole is provided with an inwardly tapering transition plane, the top end of the positioning bearing abuts against the transition plane, the positioning bearing is interference-fitted into the mounting hole, and an upper limit protrusion and a lower limit protrusion are provided on the outer periphery of the rotating shaft, the upper limit protrusion and the lower limit protrusion abut against the upper end and the lower end of the positioning bearing, respectively.

[0026] 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 into the mounting hole, achieving reliable fixation between the positioning bearing and the mounting hole. The outer circumference of the rotating shaft is provided with an upper limit protrusion and a lower limit protrusion, which abut against the upper and lower ends of the positioning bearing, respectively, to achieve axial positioning of the rotating shaft and the positioning bearing, thereby preventing the vertical movement of the rotating shaft and achieving smooth rotation of the crushing blade driven by the rotating shaft.

[0027] More preferably, the lower limiting protrusion is a boss integrally formed on the rotating shaft.

[0028] By integrally molding the lower limiting protrusion onto the boss of the rotating shaft, the additional assembly process of the lower limiting protrusion and the rotating shaft is eliminated, reducing the assembly steps. During the assembly process, the rotating shaft is first inserted into the positioning bearing from bottom to top until the boss abuts against the positioning bearing. Then, the upper limiting protrusion limits the upper end of the rotating shaft and the positioning bearing to combine the rotating shaft and the positioning bearing together. Subsequently, the combined positioning bearing is interference-fitted to the mounting hole, thus completing the fixation of the entire rotor to the bottom wall of the cup body, and simplifying the assembly process.

[0029] In a preferred embodiment, the mounting portion is the bottom surface of the bottom wall of the cup body, and the stator is welded or bonded to the mounting portion.

[0030] By directly forming the mounting part on the bottom wall of the cup body, no additional processing of the bottom wall of the cup body is required. At the same time, the stator is fixed to the mounting part by welding or bonding, eliminating the need for fixing parts, reducing material usage, and achieving reliable fixing of the stator and the cup body. Attached Figure Description

[0031] 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:

[0032] Figure 1 This is a schematic diagram of the structure of a food processing machine in one embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the installation of the brushless motor and the crushing blade in one embodiment of the present invention;

[0034] Figure 3 This is a three-dimensional structural diagram of a brushless motor in one embodiment of the present invention;

[0035] Figure 4 for Figure 3 Enlarged diagram of section A in the middle;

[0036] Figure 5 This is a partially enlarged view of a brushless motor in one embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of a food processing machine in another embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of a food processing machine in another embodiment of the present invention.

[0039] List of components and reference numerals: 10. Cup body; 101. Mounting hole; 102. Mounting part; 1021. Step; 103. Surrounding rib; 104. Transition plane; 105. Upper limit protrusion; 106. Lower limit protrusion; 11. Extension wall; 12. Anti-rotation groove; 13. Heating plate; 20. Crushing blade; 30. Brushless motor; 31. Rotating shaft; 32. Rotor; 33. Stator; 331. Anti-rotation rib; 34. Positioning bearing; 341. First bearing; 342. Second bearing; 40. Fixing pin; 41. Fixing head; 50. Support pad; 60. Housing; 70. Main unit. Detailed Implementation

[0040] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] like Figure 1-5 As shown, in one embodiment, this utility model provides a food processing machine, including a cup body 10 and a brushless motor 30 fixedly connected to the bottom of the cup body 10, such as... Figure 2As shown, the brushless motor 30 includes a rotating shaft 31, a rotor 32 fixed on the outer periphery of the rotating shaft 31, and a stator 33 surrounding the outer periphery of the rotor 32. The bottom wall of the cup body 10 is provided with a mounting hole 101 and a mounting part 102 integrally formed on the bottom wall of the cup body 10. The upper end of the rotating shaft 31 passes through the mounting hole 101 and extends into the cup body 10 and is connected to the crushing blade 20. A positioning bearing 34 is fixed in the mounting hole 101 and sleeved on the outer periphery of the rotating shaft 31. The rotor 32 is suspended in 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 free end of the rotor 32. The upper end of the stator 33 abuts against and is fixed to the mounting part 102, and the lower end of the stator 33 is suspended to form the free end of the stator 33.

[0046] It should be noted that the lower end of rotor 32 is suspended to form the rotor free end and the lower end of stator 33 is suspended to form the stator free end. This means that the lower ends of rotor 32 and stator 33 are not covered by end caps or other structures. Only stator 33 and rotor 32 are assembled through the bottom wall of cup body 10 to form a complete brushless motor 30.

[0047] This utility model suspends the rotor 32 in the mounting hole 101 with the help of the rotating shaft 31 and the positioning bearing 34, forming a free end of the rotor 32 with the lower end suspended. Thus, the rotor 32 does not need to be supported by the lower end cover in the traditional way to achieve axial positioning of the rotor 32. For the brushless motor 30, the lower end cover structure is eliminated, ensuring reliable positioning of the rotor 32. By abutting and fixing the upper end of the stator 33 to the mounting portion 102 integrally formed on the bottom wall of the cup body 10, the axial positioning of the stator 33 is achieved. On the one hand, the bottom wall of the cup body 10 serves as the upper end cover of the brushless motor 30, eliminating the need for a lower end cover to support the bottom ends of the rotor 32 and stator 33, thus further compressing the overall height of the brushless motor 30. In traditional brushless motors 30, the upper and lower supports account for 20-30% of the total motor mass and 20-40% of the total motor height. Therefore, this invention achieves a flattened and lightweight main unit. On the other hand, since the rotor 32 is confined to the mounting hole 101 and the stator 33 is confined to the mounting portion 102, it is equivalent to the stator 33 and rotor 32 of the brushless motor 30 using the bottom wall of the cup body 10 as a unified unit. Assembling based on the mounting standard reduces the assembly tolerance of rotor 32 and stator 33, resulting in a uniform air gap between stator 33 and rotor 32, smaller torque fluctuations between rotor 32 and shaft 31, and more stable operation. The lower end of rotor 32 forms a free end, and the lower end of stator 33 is suspended, forming a free end, thereby reducing resonance during operation, further improving the smoothness of brushless motor 30 operation, and reducing operating noise. At the same time, the lower ends of stator 33 and rotor 32 are suspended and unobstructed, simplifying the structure of brushless motor 30 while forming an open heat dissipation structure at the lower end, improving motor temperature rise. This structure can even eliminate the need for fan cooling, which helps to simplify brushless motor 30 and reduce operating load, thereby improving the dynamic balance of brushless motor 30.

[0048] It should be noted that this utility model does not limit the specific structure of the mounting part 102, nor does it limit the specific fixing method between the stator 33 and the mounting part 102. For example:

[0049] like Figure 1-5 As shown, in a preferred embodiment, the mounting part 102 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.

[0050] Combination Figure 2-4 As shown, more preferably, the mounting part 102 includes a fixing hole, and the stator 33 is axially fixed to the fixing hole by a fixing pin 40, such as a screw, pin or rivet. The top end of the fixing pin 40 is fixedly inserted into the fixing hole, and the bottom end of the fixing pin 40 is provided with a fixing head 41 that is radially enlarged to support the stator 33.

[0051] By setting a 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 bottom wall of the cup body 10 through the mounting part 102, ensuring precise fixing of the stator 33 to the bottom wall of the cup body 10, reducing assembly errors between the stator 33 and the rotor 32, and improving the operational stability of the brushless motor 30. By using fixing pins 40 to axially fix the stator 33 to the fixing hole, the bottom end of the fixing pins 40 is radially expanded to support the fixing head 41 of the stator 33, completing the axial and reliable fixing of the stator 33 to the bottom wall of the cup body 10. This prevents the stator 33 from loosening and causing deviations in the magnetic field experienced by the rotor 32, thereby ensuring the stable rotation of the rotor 32 and the shaft 31. Moreover, using fixing pins 40 for fixing reduces the height of the brushless motor 30 while maintaining stable operation, and the fixing structure is simple, easy to assemble, and reliable in positioning.

[0052] More preferably, such as Figure 3 As shown, the fixing pin 40 is also fitted with a support pad 50. The support pad 50 is located above the fixing head 41 and is larger than the outer diameter of the fixing head 41. The fixing head 41 supports the stator 33 through the support pad 50.

[0053] By installing a support pad 50 on the fixing pin 40, the support area of ​​the stator 33 is increased, thereby improving the stability of the support of the stator 33. Thus, even without a traditional lower end cover, the stator 33 can still be reliably axially fixed to the bottom wall of the cup body 10.

[0054] In another preferred embodiment, the step 1021 is not required on the bottom wall of the cup body 10. The mounting part 102 includes a fixing hole, and the stator 33 is axially fixed to the fixing hole by a fixing pin 40. The top end of the fixing pin 40 is fixedly inserted into the fixing hole, and the bottom end of the fixing pin 40 is provided with a fixing head 41 that is radially enlarged to support the stator 33. More preferably, the fixing pin 40 is also fitted with a support washer 50, which is located above the fixing head 41 and is enlarged relative to the outer diameter of the fixing head 41. The fixing head 41 supports the stator 33 through the support washer 50.

[0055] In this embodiment, only a fixing hole is provided on the bottom wall of the cup body to fix the stator 33, which further simplifies the structure. By sleeved a support pad 50 on the fixing nail 40, 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 bottom wall of the cup body 10.

[0056] In another preferred embodiment, the mounting part 102 is the bottom surface of the bottom wall of the cup body 10, and the stator 33 is welded or bonded to the mounting part 102.

[0057] By directly forming the mounting part 102 on the bottom wall of the cup body 10, no additional processing of the bottom wall of the cup body 10 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 cup body 10.

[0058] Of course, it is understandable that the mounting part 102 can also be the step 1021 mentioned above, and the stator 33 is fixed to the step 1021 by welding or bonding.

[0059] Additionally, it should be noted that, to achieve anti-rotation limiting between the stator 33 and the bottom wall of the cup body 10, the following options are available:

[0060] like Figure 3 , 4 As shown, the bottom wall of the cup body 10 is integrally provided with an extension wall 11 extending downward to the outer periphery of the stator 33. The extension wall 11 is provided with an anti-rotation groove 12, and the outer periphery of the stator 33 is provided with an anti-rotation rib 331 that is inserted into the anti-rotation groove 12.

[0061] By integrally setting an extension wall 11 on the bottom wall of the cup body 10, the extension wall 11 extends to the outer periphery of the stator 33, forming an assembly guide during the assembly process, so that the stator 33 is precisely assembled. At the same time, the extension wall 11 is provided with an anti-rotation groove 12 that cooperates with the anti-rotation rib 331 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 guaranteed, and smooth operation is achieved.

[0062] Alternatively, the outer peripheral wall of the stator 33 may be recessed with a plurality of notches and grooves arranged at intervals along the circumference. The notches and grooves are laterally open and match the curvature of the peripheral wall of the fixing pin. The fixing pin 40 is provided corresponding to the notch and groove and passes through the notch and groove to be fixed to the mounting part 102. The fixing head 41 is supported on the edge of the notch and groove.

[0063] Alternatively, the stator 33 is provided with an off-center through hole, through which the fixing pin 40 passes and is fixed to the mounting part 102, and the fixing head 41 is supported on the edge of the through hole.

[0064] Whether it's an off-center through hole or a notch, when the fixing pin 40 axially fixes the stator 33 and the bottom wall of the cup body 10, it also forms a rotation-stopping limit on the stator 33, achieving reliable multi-directional fixation of the stator 33 and the bottom wall of the cup body 10, thus improving the fit stability of the rotor 32 and the stator 33. By setting multiple notches in the recesses of the outer peripheral wall of the stator 33, compared with setting through holes through the stator 33, the processing technology of the stator 33 can be simplified, and the volume of the stator 33 itself can be fully utilized. This provides sufficient space for the winding of the coil, while providing notches to provide reliable space for the axial fixation of the stator 33, preventing the volume of the stator 33 from expanding, thus facilitating the further miniaturization of the brushless motor 30.

[0065] It should also be noted that this utility model does not limit the method of fixing the rotor 32, for example:

[0066] like Figure 5 As shown, 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, with the second bearing 342 located between the first bearing 341 and the top surface of the rotor 32.

[0067] 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 bottom wall of the cup body 10. 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 the rotor 32 to rotate smoothly. 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.

[0068] Of course, in other embodiments, the positioning bearing may optionally be a single bearing.

[0069] In a preferred embodiment, the mounting hole 101 has an inwardly tapering 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 into the mounting hole 101. An upper limit protrusion 105 and a lower limit protrusion 106 are provided on the outer periphery of the rotating shaft 31, abutting against the upper and lower ends of the positioning bearing 34, respectively. More preferably, the lower limit protrusion 106 is a boss integrally formed on the rotating shaft 31.

[0070] 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 moving upwards after being fixed in the mounting hole 101. The positioning bearing 34 is interference-fitted into the mounting hole 101, ensuring reliable fixation between the positioning bearing 34 and the mounting hole 101. The rotating shaft 31 has an upper limit protrusion 105 and a lower limit protrusion 106 on its outer periphery. These protrusions abut against the upper and lower ends of the positioning bearing 34, respectively, achieving axial positioning of the rotating shaft 31 and the positioning bearing 34. This prevents the rotating shaft 31 from moving up and down, ensuring smooth rotation of the crushing blade 20 driven by the rotating shaft 31.

[0071] By integrating the lower limiting protrusion 106 into the boss of the rotating shaft 31, the additional assembly process of the lower limiting 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 limiting 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 to the bottom wall of the cup body 10, which simplifies the assembly process.

[0072] Understandably, the upper limit protrusion 105 and the lower limit protrusion 106 can also be retaining rings or steps. The positioning bearing 34 and the mounting hole 101 can also be fixed by means of threads, adhesive, riveting, welding, pins, etc.

[0073] In a preferred embodiment, the bottom wall of the cup body 10 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. The stator 33 is wound with a stator 33 winding, and the stator 33 winding overlaps with the surrounding rib 103 in the height direction.

[0074] By setting the rib 103 on the bottom wall of the cup body 10, 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 rib 103 in the height direction, the space formed on the outer periphery of the rib 103 and above the stator 33 is rationally utilized, the height of the brushless motor 30 is fully utilized, the structure is compactly arranged, and the volume of the brushless motor 30 is reduced.

[0075] It should also be noted that this utility model does not limit the specific form of the food processing machine. For example, in a preferred embodiment, such as... Figure 1-5 As shown, the food processor is a high-speed blender, which includes a main unit and a blending cup that can be detachably installed on the main unit 70. The blending cup includes the cup body 10 and the brushless motor 30 mentioned above, and the blending cup also includes a cup holder wrapped around the outside of the brushless motor 30.

[0076] In another implementation, such as Figure 6 As shown, the food processor is a juicer, including a cup body 10, a brushless motor 30, and a housing 60 that at least covers the brushless motor 30. Due to the use of a highly compressed brushless motor 30, the juicer's height is reduced to below 350mm, making it easy to hold with one hand, carry, and store.

[0077] In another implementation, such as Figure 7 As shown, the food processor is a hand-washable food processor, including a main unit 70 with an installation cavity and a mixing cup installed in the installation cavity. The mixing cup includes the aforementioned cup body 10 and a brushless motor 30.

[0078] In another embodiment of this invention, the cup body 10 can be an integral cup with a bottom wall, or the cup body 10 can include a cup body with an open bottom and a heating plate 13 fixed to the open bottom of the cup body 10, see reference. Figure 1-5 The heating plate 13 forms the bottom wall of the cup.

[0079] In a more preferred embodiment, the bottom wall of the cup body 10 is provided with a heat insulation bracket with a low thermal conductivity. For example, the heat insulation bracket is fixed to the bottom of the heating plate 13 to avoid direct contact between the motor stator 33 and the heating plate, reduce the heat conduction from the heating plate to the stator 33, effectively reduce the temperature of the motor stator 33 winding, and improve the temperature rise of the brushless motor 30.

[0080] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0081] 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.

[0082] 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 cup body and a brushless motor fixedly connected to the bottom of the cup body, characterized in that, The brushless motor includes a rotating shaft, a rotor fixed to the outer circumference of the rotating shaft, and a stator surrounding the outer circumference of the rotor. The bottom wall of the cup body is provided with a mounting hole and an integrally formed mounting part on the bottom wall of the cup body. The upper end of the rotating shaft passes through the mounting hole and extends into the cup body and is connected to the crushing blade. A positioning bearing sleeved on the outer circumference of the rotating shaft is fixed in the mounting hole. The rotor is suspended in the mounting hole through the rotating shaft and the positioning bearing, and the lower end of the rotor is suspended to form a free end of the rotor. The upper end of the stator abuts against and is fixed to the mounting part, and the lower end of the stator is suspended to form a free end of the stator.

2. The 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.

3. A food processing machine according to claim 1 or 2, characterized in that, The mounting part includes a fixing hole, and the stator is axially fixed to the fixing hole by a fixing nail. The top end of the fixing nail is fixedly inserted into the fixing hole, and the bottom end of the fixing nail is provided with a fixing head that is radially enlarged to support the stator.

4. A food processing machine according to claim 3, characterized in that, The fixing pin is also fitted with a support washer, which is located above the fixing head and is larger than the outer diameter of the fixing head. The fixing head supports the stator through the support washer.

5. A food processing machine according to claim 3, characterized in that, The stator is provided with an off-center through hole, the fixing pin passes through the through hole and is fixed to the mounting part, and the fixing head is supported on the edge of the through hole; Alternatively, the outer peripheral wall of the stator is recessed with a plurality of notches and slots arranged at intervals along the circumference, the fixing pin is disposed corresponding to the notches and slots and passes through the notches and slots and is fixed to the mounting part, and the fixing head is supported on the edge of the notches and slots.

6. A food processing machine according to claim 1, characterized in that, The bottom wall of the cup body 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 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 bottom wall of the cup body is provided with a rib extending toward the rotor to form the mounting hole, the positioning bearing is fixed inside the rib, and the stator is wound with a stator winding, the stator winding and the rib overlapping in the height direction.

8. A food processing machine according to claim 1, characterized in that, The mounting hole has an inwardly tapering transition plane. The top end of the positioning bearing abuts against the transition plane. The positioning bearing is interference-fitted into the mounting hole. An upper limit protrusion and a lower limit protrusion are provided on the outer circumference of the rotating shaft. The upper limit protrusion and the lower limit protrusion abut against the upper end and the lower end of the positioning bearing, respectively.

9. A food processing machine according to claim 8, characterized in that, The lower limit protrusion is a boss integrally formed on the rotating shaft.

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

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