Food processor with good heat dissipation effect

Abstract

This utility model discloses a food processor with good heat dissipation, including a cup body with a built-in crushing device and a motor located below the cup body that drives the crushing device to rotate. The motor includes a rotor assembly and a stator assembly located on the outer periphery of the rotor assembly. The rotor assembly includes a rotating shaft and a magnet fixedly connected to the rotating shaft. The magnet includes an inner magnet fixedly connected to the rotating shaft and an outer magnet covering the outer periphery of the inner magnet. The rotor assembly also includes a fan sleeved on the outside of the rotating shaft and located below the magnet. The bottom end of the inner magnet has a mounting part, and the top end of the fan has a fixing part fixedly connected to the mounting part to rotate with the magnet. This improves the heat dissipation effect on the magnet and effectively avoids the significant temperature rise of the magnet during operation, which would cause the magnetism of the inner and outer magnets to decay due to high temperature, resulting in a significant reduction in the output torque of the magnet. This would prevent the crushing device from meeting the processing requirements of ingredients with high torque, thus ensuring the working performance of the motor.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to a food processing machine with good heat dissipation. Background Technology

[0002] Existing food processors typically consist of a cup with a built-in crushing device and a motor located below the cup that drives the crushing device. When using the food processor, the user places the food into the cup, and the motor rotates at high speed, driving the crushing device to process the food. Currently, most food processors on the market use brushed motors, which are noisy and bulky. To reduce noise and achieve miniaturization, some manufacturers are using brushless motors in food processors. This effectively reduces noise and occupies less space, meeting the requirement for overall miniaturization. Existing brushless motors in food processors typically consist of a shaft, a balance weight, an iron core, and a permanent magnet. The ratio of the rotor's axial thickness H to its radial outer diameter R is often around 1, not within 0.5, resulting in a relatively high rotor axial height. This makes it impossible to achieve an extremely flat design for the motor and the entire machine. Furthermore, the permanent magnet is made of neodymium iron boron, and the price of the rare earth element neodymium continues to rise, increasing the motor's cost. To achieve a flattened design and reduce the cost of brushless motors, the applicant's earlier patent application CN202223180384.9 discloses a motor and a cleaning robot. This patent uses a novel brushless motor in the cleaning robot, comprising a stator assembly and a rotor assembly. The stator assembly is located within a housing and on the outer periphery of the rotor assembly. The rotor assembly includes a shaft and magnets fixed to the outside of the shaft. The magnets include an inner magnet and an outer magnet, with the outer magnet covering the outer periphery of the inner magnet. This type of brushless motor effectively reduces the overall axial height and has lower production costs. Those skilled in the art would readily conceive of applying this type of brushless motor in food processing machines to achieve an extremely flattened design for both the motor and the entire machine. However, some models have a heating plate at the bottom of the cup to heat the food inside. The heat from the heating plate is also conducted downwards to the motor. The magnetic strength of the inner and outer magnets will decrease significantly after being exposed to high temperatures. Therefore, under the high-speed processing conditions of the food processor, the double-layer plastic magnetic rotor cannot dissipate heat in a timely and efficient manner, resulting in a decrease in the magnetism of the plastic magnetic rotor and a significant decrease in the output torque of the motor. Therefore, how to ensure the stability of the double-layer plastic magnetic rotor structure and efficient heat dissipation under the high-speed operation of the food processor, so as to maintain magnetic stability, is an urgent problem to be solved. Utility Model Content

[0003] The purpose of this invention is to provide a food processing machine with good heat dissipation, in order to solve the problem of existing food processing machines that reduce motor manufacturing costs by setting the motor rotor to an inner layer of plastic magnetic magnet and an outer layer of plastic magnetic magnet covering the outer periphery of the inner layer of plastic magnetic magnet. This is to prevent the inner and outer layers of plastic magnetic magnet from accumulating heat in a short time under high-speed conditions, especially between the outer layer of plastic magnetic magnet and the motor stator, which cannot be dissipated in a timely and efficient manner, leading to a decrease in the magnetism of the double-layer plastic magnetic magnet and affecting torque output.

[0004] To achieve the above objectives, this utility model provides a food processing machine with good heat dissipation, including a cup body with a built-in crushing device and a motor located below the cup body and driving the crushing device to rotate. The motor includes a rotor assembly and a stator assembly located on the outer periphery of the rotor assembly. The rotor assembly includes a rotating shaft and a magnet fixedly connected to the rotating shaft. The magnet includes an inner magnet fixedly connected to the rotating shaft and an outer magnet covering the outer periphery of the inner magnet. The rotor assembly also includes a fan sleeved on the outside of the rotating shaft and located below the magnet. The bottom end of the inner magnet is provided with a mounting part, and the top end of the fan is provided with a fixing part fixedly connected to the mounting part to rotate with the magnet.

[0005] This application sets the magnet of the motor rotor assembly to include an inner magnet fixed to the shaft and an outer magnet covering the outer periphery of the inner magnet. Compared with the structure of a single-layer magnet, this allows the magnetic strength of the magnet to be greatly increased when the motor size is fixed. This enables the motor to generate greater torque to drive the crushing device to rotate, improve the working performance of the food processing machine, and meet the user's needs. At the same time, the air gap magnetic field strength requirements of the motor can be met by adjusting the material, grade, and thickness of the two magnets, thus ensuring the stability of the food processing machine.

[0006] The rotor assembly also includes a fan sleeved on the outside of the shaft and located below the magnet. The bottom of the inner magnet has a mounting part, and the top of the fan has a fixing part that is fixedly connected to the mounting part to rotate with the magnet. This allows the inner and outer magnets to rotate synchronously, thereby driving the fan to rotate. This improves the airflow around the inner and outer magnets, increasing the gas flow rate near the magnets per unit time and thus enhancing the heat dissipation effect on the magnets. As the outer magnet has a stronger magnetic force, the fan can directly guide the airflow to the outer magnet and effectively dissipate heat from it. This ensures the magnetic strength of the outer magnet and effectively prevents the magnet from weakening due to high temperature during operation, which would cause a significant reduction in the magnet's output torque. This would prevent the crushing device from meeting the processing requirements of ingredients with high torque requirements, thus ensuring the motor's performance. Meanwhile, the fan is directly fixed to the bottom of the inner magnet through the cooperation of the mounting and fixing parts. This allows the inner magnet to drive the shaft and the fan simultaneously, serving a dual purpose and enhancing its functionality. The fan also facilitates rapid heat dissipation from the motor's interior. Compared to existing solutions that fix the fan to the shaft, this solution directly drives the fan through the inner magnet, eliminating energy loss and friction noise associated with multi-stage transmissions, thus improving transmission efficiency. Furthermore, it allows for a tight fit between the inner magnet and the fan. Combined with the flattened design of the inner and outer magnets, this effectively reduces the overall axial dimension of the motor, meeting the flattening requirements of existing models and improving the overall compactness of the machine structure.

[0007] In a preferred embodiment of a food processing machine with good heat dissipation, the mounting part is a mounting hole provided at the bottom of the inner magnet, and the fixing part is a protrusion protruding upward from the top of the fan, which is fixed in the mounting hole.

[0008] By setting the mounting part as a mounting hole at the bottom of the inner magnet and the fixing part as a protrusion extending upwards from the top of the fan, which is fixed inside the mounting hole, the fan can be directly fixed to the mounting hole during installation, thus achieving a stable connection with the inner magnet. This ensures the stability of the connection and makes the installation process simple and efficient, improving assembly efficiency. Furthermore, the design of the protrusion and mounting hole makes the structure of the mounting and fixing parts simple and reliable, helping to reduce production costs. Moreover, after the protrusion extends into the mounting hole, it allows the upper surface of the fan to fit tightly against the bottom of the inner magnet, significantly reducing the gap between the fan and the inner magnet, thereby further reducing the axial dimension of the motor and improving the compactness of the overall structure.

[0009] In a preferred embodiment of a food processing machine with good heat dissipation, a protruding interference fit is disposed within the mounting hole.

[0010] By setting the protrusion to be interference-fitted into the mounting hole, the steps for fixing the fan and the inner magnet are further simplified. This eliminates the need for special tooling to fix the protrusion to the mounting hole. Installation can be completed simply by pressing it in, which helps to improve assembly efficiency and ensures a tight fit between the fan and the inner magnet. This reduces vibration and noise caused by loosening, and enhances the stability and service life of the whole machine.

[0011] In a preferred embodiment of a food processing machine with good heat dissipation, the raised adhesive is fixed inside the mounting hole.

[0012] By setting the protrusions to be glued and fixed inside the mounting holes, not only is the connection between the fan and the inner magnet strengthened, but the complexity of the installation process is also further reduced, ensuring stability during long-term use. At the same time, the glued fixing method also effectively avoids the additional stress caused by mechanical fixing, extending the overall service life of the motor.

[0013] In a preferred embodiment of a food processing machine with good heat dissipation, the mounting hole is axially inserted through the inner magnet.

[0014] By setting the mounting hole to axially penetrate the inner magnet, on the one hand, the axial height of the mounting hole can be greatly increased, allowing the protrusion to be set longer, thereby increasing the depth to which the protrusion is inserted into the mounting hole, ensuring a more secure and tighter fit between the fan and the inner magnet; on the other hand, the axial penetration design can reduce the weight of the inner magnet, optimize the center of gravity distribution of the inner magnet, improve operational stability, reduce energy consumption, and improve transmission efficiency.

[0015] In a preferred embodiment of a food processing machine with good heat dissipation, the bottom surface of the inner magnet is provided with an upwardly recessed countersunk hole, and multiple countersunk holes are provided and spaced apart along the circumference of the inner magnet, with the mounting part located between two adjacent countersunk holes.

[0016] By providing upward-recessed countersunk holes on the bottom surface of the inner magnet, with multiple countersunk holes spaced apart along the circumference of the inner magnet, the weight of the inner magnet is greatly reduced by passing through the countersunk holes, further optimizing the center of gravity distribution of the inner magnet and improving operational stability. At the same time, it can also reduce the contact area between the inner magnet and the fan, reducing frictional heat generation, which in turn helps to reduce the temperature rise of the inner magnet and further ensure the magnetic strength of the inner magnet.

[0017] In a preferred embodiment of a food processing machine with good heat dissipation, one of the mounting part and the fixing part is a buckle, and the other is a groove that engages with the buckle, and the tightening direction of the buckle and the groove is consistent with the rotation direction of the magnet.

[0018] By designing one of the mounting and fixing parts as a snap fastener and the other as a groove that engages with the snap fastener, the fan can be quickly and securely fixed during installation by tightening the snap fastener and groove. This eliminates the need for additional connecting parts and simplifies the assembly process, improving efficiency. Furthermore, the tightening direction of the snap fastener and groove aligns with the magnet's rotation direction, ensuring stable fan drive during motor rotation. This prevents the fan from separating from the inner magnet and becoming loose when the inner magnet rotates if the tightening direction is opposite, thus ensuring fan stability.

[0019] In a preferred embodiment of a food processing machine with good heat dissipation, the distance L from the mounting part to the central axis of the rotating shaft and the radius R of the fan satisfy: 0.3≤L / R≤0.6.

[0020] By setting the distance L from the mounting part to the central axis of the rotating shaft and the radius R of the fan to satisfy: 0.3≤L / R≤0.6, we avoid a situation where the distance from the mounting part to the central axis of the rotating shaft is too small relative to the radius of the fan, causing the inner magnet to drive the fan too close to the center of rotation after the fan and inner magnet are installed, resulting in insufficient driving torque of the fan and affecting the heat dissipation effect. At the same time, we avoid a situation where the distance from the mounting part to the central axis of the rotating shaft is too large relative to the radius of the fan, causing the mounting part to be too close to the edge of the inner magnet, resulting in lower strength near the outer peripheral wall of the inner magnet and making it easy to be damaged.

[0021] In a preferred embodiment of a food processing machine with good heat dissipation, the mounting section is provided with multiple units spaced apart along the circumference of the inner magnet.

[0022] By providing multiple mounting sections spaced apart along the circumference of the inner magnet, the mounting sections can fix the fan more frequently and evenly, resulting in a more balanced and greater driving force transmitted from the inner magnet to the fan, ensuring the stability of the fan rotation and thus guaranteeing the heat dissipation effect of the motor.

[0023] In a preferred embodiment of a food processing machine with good heat dissipation, the outer peripheral wall of the inner magnet has a radially outward protrusion and a radially inward recess relative to the protrusion. The protrusion and the recess extend along the axial direction of the inner magnet. Multiple protrusions and recesses are provided and are continuously and alternately arranged along the circumference of the inner magnet. The outer magnet is integrally injection molded onto the protrusion and the recess.

[0024] By providing radially outward protrusions and radially inward recesses on the outer peripheral wall of the inner magnet, and integrally injection molding the outer magnet onto these protrusions and recesses, the tight fit between the protrusions and recesses on the outer peripheral wall of the inner magnet and the outer magnet significantly enhances the bonding strength between the two magnets. When the motor operates at high speed, the inner magnet drives the shaft to rotate, and the outer magnet achieves a tight bond with the inner magnet through the protrusions and recesses. This allows the outer magnet to apply a positive forward force to the inner magnet when transmitting torque to it. The thrust allows for the transmission of greater torque to the inner magnet, effectively preventing a situation where, under high torque, the inner magnet experiences a similarly large reaction force while the outer magnet still exerts a significant forward driving force on the inner magnet. This can lead to relative slippage between the outer and inner magnets, causing them to separate and potentially damaging the motor and preventing it from rotating. Furthermore, the protrusions and recesses significantly increase the contact area between the inner and outer magnets, enhancing friction and effectively preventing relative slippage. This ensures the motor's stability and durability under high loads, extending the equipment's lifespan. In addition, multiple protrusions and recesses are continuously and alternately arranged along the circumference of the inner magnet, greatly increasing their number and density. This further optimizes the connection between the inner and outer magnets, improving torque transmission efficiency and ensuring stable motor operation under various conditions, meeting the demands of high-efficiency food processing. Attached Figure Description

[0025] 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:

[0026] Figure 1 This is a cross-sectional view of a food processing machine according to one embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the rotor assembly in one embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of a rotor assembly in one embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the rotor assembly from another angle in one embodiment of the present invention.

[0030] List of components and reference numerals:

[0031] 1-Cup body; 2-Pulverizing device; 3-Motor; 31-Rotor assembly; 311-Shaft; 312-Outer magnet; 313-Inner magnet; 3131-Mounting hole; 3132-Counterhead hole; 3133-Protrusion; 3134-Recess; 314-Fan; 3141-Protrusion; 32-Stator assembly. Detailed Implementation

[0032] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0033] It should be noted that many specific details are set forth in the following description in order 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.

[0034] like Figures 1 to 4 As shown, this utility model provides a food processor with good heat dissipation, including a cup body 1 with a built-in crushing device 2 and a motor 3 located below the cup body 1 and driving the crushing device 2 to rotate. The motor 3 includes a rotor assembly 31 and a stator assembly 32 located on the outer periphery of the rotor assembly 31. The rotor assembly 31 includes a rotating shaft 311 and a magnet fixedly connected to the rotating shaft 311. The magnet includes an inner magnet 313 fixedly connected to the rotating shaft 311 and an outer magnet 312 covering the outer periphery of the inner magnet 313. The rotor assembly 31 also includes a fan 314 sleeved on the outside of the rotating shaft 311 and located below the magnet. The bottom end of the inner magnet 313 is provided with a mounting part, and the top end of the fan 314 is provided with a fixing part fixedly connected to the mounting part to rotate with the magnet.

[0035] This application sets the magnet of the rotor assembly 31 of the motor 3 to include an inner magnet 313 fixed to the rotating shaft 311 and an outer magnet 312 covering the outer periphery of the inner magnet 313. Compared with the structure of a single-layer magnet, this allows the motor 3 to greatly increase the magnetic strength of the magnet under a certain size, thereby enabling it to generate greater torque to drive the crushing device 2 to rotate, improving the working performance of the food processing machine and meeting the user's needs. At the same time, the air gap magnetic field strength requirements of the motor 3 can be met by adjusting the material, grade and thickness of the two magnets, ensuring the stability of the food processing machine.

[0036] Meanwhile, the rotor assembly 31 also includes a fan 314 sleeved on the outside of the rotating shaft 311 and located below the magnet. The bottom end of the inner magnet 313 is provided with a mounting part, and the top end of the fan 314 is provided with a fixing part fixedly connected to the mounting part to rotate with the magnet. This allows the inner magnet 313 and the outer magnet 312 to synchronously drive the fan 314 to rotate, thereby driving the airflow near the inner magnet 313 and the outer magnet 312, increasing the gas flow rate passing near the magnet per unit time, and thus improving the effect on the magnet. The fan 314, acting as the outer magnet 312 with greater magnetic force, directly guides airflow to the outer magnet 312, effectively dissipating heat and ensuring its magnetic strength. This prevents significant temperature rise during operation, which could lead to magnetism decay in the inner and outer magnets 313 and cause a substantial reduction in output torque. This would prevent the pulverizing device 2 from failing to meet the high torque requirements of food processing, thus ensuring the performance of the motor 3. Simultaneously, the fan 314 is directly fixed to the bottom of the inner magnet 313 through the cooperation of the mounting and fixing parts. This allows the inner magnet 313 to drive the rotating shaft 311 while simultaneously driving the fan 314, serving a dual purpose and enhancing its functionality. Furthermore, the fan 314 facilitates rapid heat dissipation from the motor 3. Furthermore, compared to the existing solution of fixing the fan 314 to the shaft 311 to drive its rotation, this solution enables the inner magnet 313 to directly drive the fan 314, eliminating the energy loss and friction noise caused by multi-stage transmission, which helps to improve transmission efficiency. It also enables the inner magnet 313 to be in close contact with the fan 314. Combined with the flat design of the inner magnet 313 and the outer magnet 312, the axial dimension of the entire motor 3 can be effectively reduced, meeting the flat design requirements of existing models and improving the compactness of the overall structure.

[0037] It should be noted that this application does not specifically limit the structure of the mounting part and the fixing part, which can be any of the following embodiments:

[0038] Example 1: As Figure 3 As shown, in this embodiment, the mounting part is a mounting hole 3131 provided at the bottom of the inner magnet 313, and the fixing part is a protrusion 3141 protruding upward from the top of the fan 314, and the protrusion 3141 is fixed in the mounting hole 3131.

[0039] By setting the mounting part as a mounting hole 3131 at the bottom of the inner magnet 313 and the fixing part as a protrusion 3141 protruding upward from the top of the fan 314, with the protrusion 3141 fixed inside the mounting hole 3131, the fan 314 can directly fix the protrusion 3141 inside the mounting hole 3131 during installation, thus achieving a fixed connection with the inner magnet 313. This ensures the stability of the connection between the two, and the installation process is simple and efficient, helping to improve assembly efficiency. At the same time, the design of the protrusion 3141 and the mounting hole 3131 makes the structure of the mounting part and the fixing part simple and reliable, helping to reduce production costs. Furthermore, after the protrusion 3141 extends into the mounting hole 3131, it allows the upper surface of the fan 314 to be tightly attached to the bottom of the inner magnet 313, thereby greatly reducing the gap between the fan 314 and the inner magnet 313, further reducing the axial dimension of the motor 3, and improving the compactness of the overall structure.

[0040] It should be further noted that this application does not specifically limit the fixing method of the protrusion 3141 and the mounting hole 3131, which can be any of the following embodiments:

[0041] Implementation method 1: In this embodiment, the protrusion 3141 is interference-fitted into the mounting hole 3131.

[0042] By setting the protrusion 3141 as an interference fit within the mounting hole 3131, the steps for fixing the fan 314 and the inner magnet 313 are further simplified. This eliminates the need for special tooling to fix the protrusion 3141 to the mounting hole 3131. Installation can be completed simply by pressing it in, which helps to further improve assembly efficiency and ensures a tight fit between the fan 314 and the inner magnet 313. This reduces vibration and noise caused by loosening, and enhances the stability and service life of the entire machine.

[0043] Implementation Method 2: In this implementation method, the protrusion 3141 is glued and fixed inside the mounting hole 3131.

[0044] By setting the protrusion 3141 to be glued and fixed inside the mounting hole 3131, not only is the connection between the fan 314 and the inner magnet 313 strengthened, but the complexity of the installation process is also further reduced, ensuring stability during long-term use. At the same time, the glued fixing method also effectively avoids the additional stress caused by mechanical fixing, extending the overall service life of the motor 3.

[0045] It should also be noted that this application does not specifically limit the structure of the mounting hole 3131. As one preferred embodiment of this application, such as... Figure 3 As shown, the mounting hole 3131 is axially inserted through the inner magnet 313.

[0046] By setting the mounting hole 3131 to axially penetrate the inner magnet 313, on the one hand, the axial height of the mounting hole 3131 can be greatly increased, allowing the protrusion 3141 to be set longer, thereby increasing the depth of the protrusion 3141 inserted into the mounting hole 3131, ensuring a more secure and tighter connection between the fan 314 and the inner magnet 313; on the other hand, the axial penetration design can reduce the weight of the inner magnet 313, optimize the center of gravity distribution of the inner magnet 313, improve operational stability, reduce energy consumption, and improve transmission efficiency.

[0047] Example 2: In this example, one of the mounting part and the fixing part is a snap fastener, and the other is a groove that engages with the snap fastener. The tightening direction of the snap fastener and the groove is consistent with the rotation direction of the magnet. More preferably, the mounting part is a groove and the fixing part is a snap fastener.

[0048] By designing one of the mounting and fixing parts as a snap fastener and the other as a groove that engages with the snap fastener, the fan 314 can be quickly and securely fixed by tightening the snap fastener and groove during installation. This eliminates the need for additional connecting parts and other cumbersome steps, simplifying the assembly process and improving assembly efficiency. Furthermore, the tightening direction of the snap fastener and groove is consistent with the rotation direction of the magnet, ensuring that the motor 3 can stably drive the fan 314 when rotating. This prevents the fan 314 from separating from the inner magnet 313 and becoming loose when the inner magnet 313 rotates if the tightening direction of the snap fastener and groove is opposite to the rotation direction of the magnet, thus ensuring the stability of the fan 314's rotation.

[0049] As a preferred embodiment of this application, such as Figure 2 As shown, the bottom surface of the inner magnet 313 is provided with an upwardly recessed countersunk hole 3132. Multiple countersunk holes 3132 are provided and are spaced apart along the circumference of the inner magnet 313. The mounting part is located between two adjacent countersunk holes 3132.

[0050] By providing upwardly recessed countersunk holes 3132 on the bottom surface of the inner magnet 313, and having multiple countersunk holes 3132 spaced apart along the circumference of the inner magnet 313, the weight of the inner magnet is greatly reduced by passing through the countersunk holes 3132, further optimizing the center of gravity distribution of the inner magnet 313, improving operational stability, and also reducing the contact area between the inner magnet 313 and the fan 314, reducing frictional heat generation, thereby helping to reduce the temperature rise of the inner magnet 313, and further ensuring the magnetic strength of the inner magnet 313.

[0051] As a preferred embodiment of this application, such as Figure 3 As shown, the distance L from the mounting part to the central axis of the rotating shaft 311 and the radius R of the fan 314 satisfy: 0.3≤L / R≤0.6, more preferably, L / R=0.3, 0.5 or 0.6.

[0052] By setting the distance L from the mounting part to the central axis of the rotating shaft 311 and the radius R of the fan 314 to satisfy: 0.3≤L / R≤0.6, the following situation is avoided: the distance L from the mounting part to the central axis of the rotating shaft 311 is too small relative to the radius of the fan 314, which would cause the inner magnet 313 to drive the fan 314 too close to the rotation center after the fan 314 and the inner magnet 313 are installed, resulting in insufficient driving torque of the fan 314 and affecting the heat dissipation effect. At the same time, the following situation is avoided: the distance L from the mounting part to the central axis of the rotating shaft 311 is too large relative to the radius of the fan 314, which would cause the mounting part to be too close to the edge of the inner magnet 313, resulting in lower strength near the outer peripheral wall of the inner magnet 313 and making it easy to be damaged.

[0053] As a preferred embodiment of this application, such as Figure 2 As shown, the mounting section has multiple units that are spaced apart circumferentially along the inner magnet 313.

[0054] By providing multiple mounting parts that are spaced apart around the inner magnet 313, the mounting parts can fix the fan 314 more frequently and more evenly, making the driving force transmitted from the inner magnet 313 to the fan 314 more balanced and greater, ensuring the stability of the fan 314's rotation, and thus ensuring the heat dissipation effect of the motor 3.

[0055] As a preferred embodiment of this application, as shown in the figure, the outer peripheral wall of the inner magnet 313 is provided with a radially outward protrusion 3133 and a radially inward recess 3134 relative to the protrusion 3133. The protrusion 3133 and the recess 3134 extend along the axial direction of the inner magnet 313. There are multiple protrusions 3133 and recesses 3134, which are continuously and alternately arranged along the circumference of the inner magnet 313. The outer magnet 312 is integrally injection molded onto the protrusions 3133 and the recesses 3134.

[0056] By providing a radially outward protrusion 3133 and a radially inward recess 3134 on the outer peripheral wall of the inner magnet 313, and integrally injection molding the outer magnet 312 onto the protrusion 3133 and the recess 3134, the protrusion 3133 and the recess 3134 on the outer peripheral wall of the inner magnet 313 are in close contact with the outer magnet 312, which can greatly improve the bonding strength between the two magnets. When the motor 3 runs at high speed, the inner magnet 313 drives the rotating shaft 311 to rotate, and the outer magnet 312 achieves a tight bond with the inner magnet 313 through the protrusion 3133 and the recess 3134, so that when the outer magnet 312 transmits torque to the inner magnet 313, the protrusion 3133 and the recess 3134 can make the inner magnet 312 transmit torque to the inner magnet 313. The outer magnet 312 applies a positive forward thrust to the inner magnet 313, which can transmit a larger torque to the inner magnet 313. This effectively avoids the situation where, when the shaft 311 is subjected to a large torque, the inner magnet 313 is also subjected to a large reaction force, and the outer magnet 312 still has a large forward driving force on the inner magnet 313. In this case, the outer magnet 312 and the inner magnet 313 may slide relative to each other, causing them to separate and leading to damage to the motor 3 and preventing it from rotating. On the other hand, the presence of the protrusion 3133 and the recess 3134 can greatly increase the contact area between the inner magnet 313 and the outer magnet 312, enhance the friction between the magnets, effectively prevent relative sliding, ensure the stability and durability of the motor 3 under high load operation, and extend the service life of the equipment. In addition, both the protrusions 3133 and the recesses 3134 are provided in multiples and are continuously and alternately arranged along the circumference of the inner magnet 313, which greatly increases the number and distribution density of the protrusions 3133 and the recesses 3134, further optimizes the bonding effect between the inner magnet 313 and the outer magnet 312, improves the torque transmission efficiency, and ensures that the motor 3 can operate stably under various working conditions, meeting the needs of efficient food processing.

[0057] It should be noted that this application does not specifically limit the magnetic relationship between the inner magnet 313 and the outer magnet 312. As a preferred embodiment of this application, the remanence of the outer magnet 312 is not less than that of the inner magnet 313.

[0058] By setting the remanence of the outer magnet 312 to be no less than that of the inner magnet 313, preferably with the remanence of the inner magnet 313 being less than that of the outer magnet 312, the operating point of the inner magnet 313 is higher than that of the single-layer magnet, and the inner magnet 313 is further away from the demagnetization inflection point. This is beneficial to improving the overall irreversible demagnetization performance of the magnet, thereby ensuring the reliability of the motor 3 under different temperature conditions.

[0059] The technical solutions protected by this utility model are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this utility model. Although this utility model has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A food processor with good heat dissipation effect, comprising a cup body with built-in crushing device and a motor arranged below the cup body and driving the crushing device to rotate, the motor comprising a rotor assembly and a stator assembly arranged on the outer periphery of the rotor assembly, the rotor assembly comprising a rotating shaft and a magnet fixedly connected with the rotating shaft, characterized in that, The magnet includes an inner magnet fixed to the rotating shaft and an outer magnet covering the outer periphery of the inner magnet. The rotor assembly also includes a fan sleeved on the outside of the rotating shaft and located below the magnet. The bottom end of the inner magnet is provided with a mounting part, and the top end of the fan is provided with a fixing part fixedly connected to the mounting part to rotate with the magnet.

2. The food processor of claim 1, wherein, The mounting part is a mounting hole provided at the bottom end of the inner magnet, and the fixing part is a protrusion protruding upward from the top end of the fan, which is fixed in the mounting hole.

3. The food processing machine with good heat dissipation effect according to claim 2, characterized in that, The protrusion is inserted into the mounting hole.

4. The food processor of claim 2, wherein the food processor is characterized by, The protrusion is glued and fixed inside the mounting hole.

5. The food processor of claim 2, wherein the food processor is characterized by, The mounting hole is axially inserted through the inner magnet.

6. The food processor of claim 1, wherein, The bottom surface of the inner magnet is provided with an upwardly recessed countersunk hole. Multiple countersunk holes are provided and spaced apart along the circumference of the inner magnet. The mounting part is located between two adjacent countersunk holes.

7. The food processor of claim 1, wherein the food processor comprises a heat dissipation structure. One of the mounting part and the fixing part is a buckle, and the other is a groove that engages with the buckle. The tightening direction of the buckle and the groove is the same as the rotation direction of the magnet.

8. The food processor of claim 1, wherein, The distance L from the mounting part to the center axis of the rotating shaft and the radius R of the fan satisfy the condition: 0.3≤L / R≤0.

6.

9. The food processor of claim 1, wherein, The mounting section is provided in multiple parts and is spaced apart along the circumference of the inner magnet.

10. The food processor of claim 1, wherein, The outer peripheral wall of the inner magnet has a radially outward protrusion and a radially inward recess relative to the protrusion. The protrusion and the recess extend along the axial direction of the inner magnet. There are multiple protrusions and recesses, which are continuously and alternately arranged along the circumference of the inner magnet. The outer magnet is integrally injection molded onto the protrusion and the recess.

Images