A serial heat dissipation structure of a direct current motor module and a soybean milk machine

Abstract

The utility model discloses a series heat dissipation structure of direct current motor module and soybean milk machine relates to household appliance technical field. The series heat dissipation structure is applied to the electric appliance, and the electric appliance includes the shell, and the support in the shell, and the support is fixed with the motor in the inside, and the heat dissipation flow channel is formed between the motor and the inside of support, and the upper portion of heat dissipation flow channel is the air inlet end, and the lower portion is the air outlet end, and the fan is equipped in the heat dissipation flow channel, and the fan is used for making the heat dissipation flow channel form the heat dissipation air current from top to bottom, and the drive board is fixed between the fan and the air outlet end, and makes the heat dissipation air current to the drive board main part. The air current produced by single fan is used to carry out efficient heat dissipation to the motor and drive board in proper order, and the working temperature of both is reduced significantly, and the heat accumulation is avoided effectively.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to a serial heat dissipation structure for a DC motor module and a soy milk maker. Background Technology

[0002] Currently, most household soymilk makers use traditional brushed motors as their drive source, which are widely used due to their simple structure and low manufacturing cost. However, this type of motor requires continuous physical contact between the brushes and the commutator to achieve current commutation and rotor rotation during operation. This fundamental principle leads to its inherent drawbacks. During operation, the mechanical friction between the brushes and the commutator not only generates unpleasant and significant noise, affecting the user experience, but also causes continuous wear on the brushes themselves. This wear causes the motor's performance to gradually decline with increasing usage time, ultimately resulting in weak stirring, reduced efficiency, and a limited lifespan for the soymilk maker.

[0003] Besides noise and wear issues, the friction process also generates significant heat. This additional heat not only exacerbates the temperature rise inside the motor but also wastes some electrical energy, leading to a decrease in the motor's effective output torque and energy conversion efficiency, making it difficult to achieve breakthroughs in the speed of the stirring blade. To overcome these shortcomings of brushed motors, the industry has naturally turned its attention to brushless DC motors. Brushless motors use electronic commutation, completely eliminating physical brushes, thus possessing significant advantages such as high efficiency, low operating noise, and longer lifespan, making them theoretically very suitable as an upgrade drive solution for soy milk makers.

[0004] However, the application of brushless motors is not as simple as a direct replacement. Traditional brushed motors can be directly connected to electricity, with the circuit board only controlling signals such as speed; the heat source is mainly the motor itself. In contrast, brushless DC motors require a dedicated drive control board to function properly. This board includes an electronic commutator, composed of power MOSFETs or IGBTs, which switches the winding current direction according to control signals. This drive board itself is a heat source during operation, generating considerable heat, far exceeding the heat generated by the brushless DC motor itself. In the extremely compact internal space of a soymilk maker, where the motor needs to rotate at high speed for extended periods to drive the blades for stirring or crushing, if the heat generated by the drive board cannot be dissipated effectively and promptly, its temperature will rise sharply. This not only affects the control accuracy and reliability of the drive board but, in severe cases, can even trigger thermal protection shutdown or component damage, thus threatening the operational safety of the entire machine.

[0005] Therefore, there is an urgent need to provide a serial heat dissipation structure for a DC motor module and a soymilk maker to solve the above-mentioned technical problems. Summary of the Invention

[0006] To address the problems in related technologies, this utility model proposes a serial heat dissipation structure for a DC motor module and a soy milk maker, which effectively dissipates heat from the DC motor module used inside household appliances such as soy milk makers.

[0007] This utility model is implemented as follows:

[0008] A serial heat dissipation structure for a DC motor module is applied to an electrical appliance; the electrical appliance includes a housing and a bracket disposed within the housing; the DC motor module includes a motor and a drive board electrically connected, the drive board being used to control the output of the motor, the motor having a rotatable output shaft; the drive board is electrically connected to a power supply; the motor is a brushless DC motor;

[0009] The serial heat dissipation structure includes a heat dissipation channel formed between the motor and the bracket, and a fan installed in the heat dissipation channel; the upper part of the heat dissipation channel is an air inlet, and the lower part is an air outlet; the fan is used to form a downward heat dissipation airflow in the heat dissipation channel; the drive plate is fixedly installed between the fan and the air outlet, so that the heat dissipation airflow is directed towards the drive plate body.

[0010] When a driver board with an IGBT or similar electronic commutator is operating, the temperature it generates can reach 140 degrees Celsius. The brushless DC motor itself only heats up due to the current flowing through it, generating far less heat than the driver board. Therefore, the cooling airflow first carries away the motor's heat to prevent it from overheating and shutting down. At this point, the temperature of the cooling airflow rises slightly, but it is still lower than the driver board's temperature. Therefore, the heated airflow continues to dissipate heat from the driver board, ultimately carrying away most of the heat within the cooling channels, especially the heat from the driver board itself.

[0011] As a further optimization of the above solution, an air inlet is provided on the side wall of the bracket; the height of the air inlet is higher than the installation height of the fan; the air inlet serves as the air intake end;

[0012] The outer casing surface is provided with an open connecting portion, allowing airflow to enter and exit the interior of the casing through the connecting portion; the connecting portion includes a first connecting portion and a second connecting portion; the second connecting portion is located within the coverage area of ​​the bracket and serves as the air outlet; the first connecting portion is located outside the coverage area of ​​the bracket.

[0013] A connecting part refers to an open structure on the surface of the outer shell, including but not limited to openings, through holes, and slots.

[0014] The bracket body isolates the first and second connecting parts into two areas, ensuring that air enters the heat dissipation channel only through the air inlet. After the fan starts, it sequentially draws in airflow from outside the electrical components through the first connecting part and the air inlet, and after passing through the heat dissipation channel, it outputs heat-carrying airflow from the second connecting part.

[0015] As a further optimization of the above solution, the outer bottom of the housing is provided with a protruding structure; when the electrical appliance is placed horizontally, the protruding structure creates a gap at the bottom of the housing; the first connecting portion is provided on the bottom surface of the housing and located on the outer periphery of the bracket. These features ensure smooth airflow while concealing the first connecting portion.

[0016] As a further optimization of the above solution, the second connecting part is provided at the bottom of the side wall of the housing, and the second connecting part is located on the outer periphery of the drive plate, so that the heat dissipation airflow blown toward the surface of the drive plate is output from the side.

[0017] By setting a second connecting part on the side wall, directional and efficient heat dissipation of the drive board is achieved, avoiding the accumulation of hot air inside the bracket.

[0018] As a further optimization of the above solution, the bracket includes a vertically extending main housing, in which the fan and the drive plate are installed sequentially from top to bottom; the bracket has an outwardly protruding guide portion in the horizontal direction of the drive plate; the end of the guide portion covers the second connecting portion; the guide portion gradually tapers from its connection with the main housing towards its end.

[0019] The gradually narrowing guide section effectively gathers and accelerates the heat dissipation airflow, ensuring that the airflow is efficiently discharged from the second connecting section.

[0020] As a further optimization of the above solution, the support includes a detachable upper support and a lower support;

[0021] The upper support includes a housing surrounding the outer periphery of the motor, with an opening at the bottom and several slots along the edge of the opening. The upper surface of the housing is horizontally expanded outward to form a tray-like structure. The tray-like structure has an opening through which the output axis of the motor passes upward.

[0022] The lower support includes a cover with openings at the top and bottom, and the guide portion is disposed on the cover;

[0023] When the upper bracket and the lower bracket are connected, the lower end of the upper bracket is inserted into the upper opening of the lower bracket, so that the slot is formed as the air inlet; the motor is fixedly connected to the upper bracket; the lower end of the lower bracket is fixedly connected to the bottom of the outer shell; and the drive plate is fixed inside the lower bracket.

[0024] The tray-mounted structure is used to support structures such as the cup of a soy milk maker and the heating plate. The slots are used for ventilation inside and outside the support, and can also serve as deformation slots, allowing the upper support to form an elastic deformation structure, which facilitates assembly and ensures a stable connection.

[0025] As a further optimization of the above solution, the lower surface of the tray-shaped structure is provided with a downwardly protruding mounting post, the mounting post having a threaded hole with the opening facing downwards; the lower bracket has a vertically extending connecting post; the connecting post has a hollow channel; the hollow channel has an annular limiting part, and a positioning groove is formed on the annular limiting part;

[0026] During assembly, the mounting post is inserted into the positioning groove, and the screw passes through the annular limiting part from bottom to top to connect with the threaded hole.

[0027] The locating groove is used for positioning and connecting the mounting post and the connecting post. The annular limiting part is used to restrict the passage of screws.

[0028] As a further optimization of the above solution, the inner surface of the bottom of the outer shell has a raised limiting frame; a vertically extending connecting post is provided along the limiting frame; the connecting post has a hollow channel; the hollow channel has an annular limiting part, and a positioning groove is formed on the annular limiting part;

[0029] The lower bracket has a protruding and vertically extending mounting post on its outer periphery, and the mounting post has a threaded hole with the opening facing downward.

[0030] During assembly, the limiting frame surrounds the bottom outer perimeter of the lower bracket; the mounting post is embedded in the positioning groove, and a screw passes through the annular limiting part from bottom to top, engaging with the threaded hole.

[0031] Furthermore, the lower support has several wire guide grooves along its lower opening edge for wiring of components such as the drive board and motor. These wire guide grooves can also function as deformation grooves.

[0032] As a further optimization of the above solution, the motor is located directly above the fan; the output shaft of the motor extends downward and is connected to the fan.

[0033] This utility model also provides a soymilk maker, which applies a serial heat dissipation structure of a DC motor module as described above; the soymilk maker is the electrical appliance; the soymilk maker includes an inner cup, which is located above the motor and inside the outer casing; a rotating blade is provided inside the inner cup; the output axis of the motor extends upward and is connected to the rotating blade; a heating unit is provided at the outer bottom of the inner cup for heating the inner cup.

[0034] When both the fan and the rotating cutter use motors as drive sources, dual-axis brushless DC motors can be used. They can be coaxial with the same speed, or dual-axis with two rotors but different axes. This explanation is not intended to be restrictive.

[0035] The beneficial effects are as follows:

[0036] This invention provides a serial heat dissipation structure for a DC motor module and a soymilk maker. By constructing a serial heat dissipation channel within the motor bracket, the airflow generated by a single fan efficiently dissipates heat from the motor and drive board sequentially, significantly reducing their operating temperatures and preventing heat buildup. This structure, combined with the application of a brushless DC motor, enables soymilk makers and other electrical appliances to possess comprehensive advantages such as low noise, high energy efficiency, and excellent thermal management. Attached Figure Description

[0037] Figure 1 This is a partial structural cross-sectional view of the soymilk maker provided in an embodiment of the present utility model;

[0038] Figure 2 for Figure 1 A schematic diagram of the internal structure of the part;

[0039] Figure 3 for Figure 2 Top view;

[0040] Figure 4 for Figure 3 Sectional view in the AA direction;

[0041] Figure 5 for Figure 3 Sectional view in the BB direction;

[0042] Figure 6 Exploded view of the bracket and bottom structure of the outer shell provided in the embodiment of this utility model;

[0043] Figure 7 A cross-sectional view of the bottom of the bracket and the housing provided in an embodiment of this utility model.

[0044] Figure label:

[0045] 1. Outer shell; 11. First connecting part; 12. Second connecting part; 13. Protruding structure; 14. Gap; 15. Limiting frame;

[0046] 2. Bracket; 21. Upper bracket; 211. Slotted; 212. Tray-like structure; 22. Lower bracket; 221. Cable tray; 222. Guide section; 23. Air inlet;

[0047] 3. Heating unit;

[0048] 4. Inner cup;

[0049] 5. Electric motor;

[0050] 6. Driver board;

[0051] 7. Fan;

[0052] 8. Mounting post; 81. Threaded hole;

[0053] 9. Connecting post; 91. Annular limiting part; 92. Positioning groove;

[0054] 10. Heat dissipation airflow. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0056] like Figures 1 to 7 As shown, this utility model provides a food processor, including a housing 1; inside the housing 1, from bottom to top, are a bracket 2 for fixing a motor 5, a heating unit 3, and an inner cup 4. The inner cavity of the inner cup 4 serves as the food processor's cooking chamber. The heating unit 3 is fixedly attached to the outer bottom of the inner cup 4 to generate heat and conduct it to the inner cavity of the inner cup 4. A rotatable rotating blade is provided in the center of the inner cup 4 for processing food such as stirring and chopping. The rotating blade is connected to the output shaft of the motor 5. Specifically, the output shaft of the motor 5 extends vertically upward from the bracket 2 through the inner cup 4 and connects to the rotating shaft of the rotating blade. An oil seal is provided on the output shaft at the connection between the output shaft and the inner cup 4.

[0057] The food processor in this embodiment employs a serial heat dissipation structure for a DC motor 5 module. This includes a fan 7 for heat dissipation, and heat dissipation channels formed within the motor 5 and the support 2, for cooling the motor 5 and the drive board 6 that controls the motor 5.

[0058] Specifically, the outer casing 1 has an open connecting portion on its surface to allow communication between the inside and outside of the outer casing 1. The connecting portion refers to an opening, slot 211, etc., through which airflow enters and exits the interior of the outer casing 1. The connecting portion includes a first connecting portion 11 and a second connecting portion 12; wherein, the first connecting portion 11 is located on the bottom surface of the outer casing 1, and the second connecting portion 12 is located on the bottom of the side wall of the outer casing 1.

[0059] To allow airflow at the bottom of the outer casing 1, the outer surface of the bottom of the outer casing 1 is provided with multiple downward-facing protrusions 13. When the soymilk maker is placed horizontally, the protrusions 13 create gaps 14 at the bottom of the outer casing 1. Airflow passes through the gaps 14 to the first connecting portion 11. Specifically, the inner surface of the bottom of the outer casing 1 is also provided with a protruding limiting frame 15, which surrounds the second connecting portion 12, while the first connecting portion 11 is located outside the limiting frame 15.

[0060] In this embodiment, the support 2 includes a separable upper support 2 and a lower support 2. The lower support 2 includes a cover with upper and lower openings. The lower opening of the lower support 2 is adapted to the limiting frame 15, isolating the second connecting portion 12 and the first connecting portion 11 from the inside and outside of the support 2. The upper support 2 is connected to the upper opening of the lower support 2.

[0061] The upper support 2 includes a housing with an opening at the bottom, and the edge of the opening has several slots 211. The upper surface of the housing is horizontally expanded outward to form a tray-like structure 212. The tray-like structure 212 is provided with an opening through which the output axis of the power supply 5 passes upward.

[0062] After the upper and lower supports 2 are connected, a vertically extending cavity is formed inside the supports 2. The slot 211 of the upper support 2 and the lower support 2 together form an air inlet 23. Inside the cavity, from top to bottom, are arranged a motor 5, a fan 7, and a drive plate 6. The motor 5 is enclosed within the upper support 2, and the air inlet 23 surrounds the outer periphery of the motor 5. The output axis of the motor 5 extends upwards into the inner cup 4 and downwards to connect with the fan 7. The height of the air inlet 23 is higher than the installation height of the fan 7. The drive plate 6 is located directly below the fan 7 and within the lower support 2. The airflow generated by the fan 7 is from top to bottom. The tray structure is used to support structures such as the food processor cup and heating plate.

[0063] It should be noted that motor 5 is a brushless DC motor with a rotatable output shaft; motor 5 is electrically connected to drive board 6, which controls the output of motor 5, including rotational speed. Motor 5 and drive board 6 constitute a DC motor module. Drive board 6 and fan 7 are electrically connected to the power supply.

[0064] Specifically, the lower bracket 2 has a guide portion 222 that extends outward in the horizontal direction of the drive plate 6; the end of the guide portion 222 covers the second connecting portion 12; the guide portion 222 gradually tapers towards its end from the connection point with the main housing.

[0065] By setting the bracket 2, the second connecting part 12 is located within the coverage area of ​​the bracket 2 and on the outer periphery of the drive plate 6; the first connecting part 11 is located outside the coverage area of ​​the bracket 2, that is, on the outer periphery of the lower bracket 2.

[0066] A heat dissipation channel is formed between the motor 5 and the bracket 2; the air inlet 23 is the air inlet end of the heat dissipation channel, and the second connecting part 12 is the air outlet end of the heat dissipation channel.

[0067] The bracket 2 body isolates the first connecting part 11 and the second connecting part 12 into two areas, so that the air intake only enters the heat dissipation channel through the air intake end. After the fan 7 is started, it draws in airflow from outside the electrical components through the first connecting part 11 and the air inlet 23 in sequence. After the airflow enters the heat dissipation channel, it dissipates heat from the motor 5 and the drive plate 6 in sequence. The heat dissipation airflow 10 blowing towards the surface of the drive plate 6 is output from the side through the guide part 222, and the heat-carrying heat dissipation airflow 10 is output from the second connecting part 12.

[0068] When the driver board 6, equipped with an IGBT or similar electronic commutator, is operating, the temperature generated can reach 140 degrees Celsius. The DC brushless motor 5, however, only generates heat due to the current flowing through it, resulting in significantly less heat than the driver board 6. Therefore, the cooling airflow 10 first removes the heat from the motor 5 to prevent it from overheating and shutting down. At this point, the temperature of the cooling airflow 10 rises slightly, but remains lower than the temperature of the driver board 6. Thus, the heated cooling airflow 10 continues to dissipate heat from the driver board 6, ultimately removing most of the heat from the cooling channels, particularly the driver board 6.

[0069] By providing a second connecting portion 12 on the side wall, directional and efficient heat dissipation is achieved for the drive plate 6, preventing hot air from accumulating inside the bracket 2. The gradually narrowing guide portion 222 effectively converges and accelerates the heat dissipation airflow 10, ensuring that the airflow is efficiently discharged from the second connecting portion 12.

[0070] To achieve a secure connection between the upper and lower brackets 2 and improve maintainability, specifically, the lower surface of the tray-shaped structure 212 is provided with a downwardly protruding mounting post 8, the mounting post 8 having a threaded hole 81 with the opening facing downwards; the lower bracket 2 has a vertically extending connecting post 9; the connecting post 9 has a hollow channel; the hollow channel has an annular limiting part 91, and a positioning groove 92 is formed on the annular limiting part 91;

[0071] During assembly, the mounting post 8 is inserted into the positioning groove 92, and the screw passes through the annular limiting part 91 from bottom to top to connect with the threaded hole 81.

[0072] The positioning groove 92 is used for positioning and connecting the mounting column 8 and the connecting column 9. The annular limiting part 91 is used to restrict the passage of screws. When the upper bracket 2 and the lower bracket 2 are connected, the lower end of the upper bracket 2 is inserted into the upper opening of the lower bracket 2, so that the slot 211 forms an air inlet 23; the slot 211 of the upper bracket 2 can also serve as a deformation groove, so that the upper bracket 2 forms an elastic deformation structure, which is convenient for assembly and has a stable connection. The lower opening edge of the lower bracket 2 is provided with several wire passage grooves 221 for wiring of components such as the drive board 6 and the motor 5. The wire passage grooves 221 of the lower bracket 2 can also serve as deformation grooves.

[0073] The connection between the lower bracket 2 and the outer shell 1 is similar. Specifically, a vertically extending connecting post 9 is provided along the limiting frame 15; a protruding and vertically extending mounting post 8 is provided on the outer periphery of the lower bracket 2; during assembly, the limiting frame 15 surrounds the bottom outer periphery of the lower bracket 2; the mounting post 8 is embedded in the positioning groove 92, and a screw passes through the annular limiting part 91 from bottom to top, and is connected with the threaded hole 81.

[0074] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A serial heat dissipation structure for a DC motor module, applied to an electrical appliance; the electrical appliance includes a housing and a bracket disposed within the housing; the DC motor module includes a motor and a drive board electrically connected, the drive board being used to control the output of the motor, the motor having a rotatable output shaft; the drive board being electrically connected to a power supply; characterized in that: The motor is a DC brushless motor; The serial heat dissipation structure includes a heat dissipation channel formed between the motor and the bracket, and a fan installed in the heat dissipation channel; the upper part of the heat dissipation channel is an air inlet, and the lower part is an air outlet; the fan is used to form a downward heat dissipation airflow in the heat dissipation channel; the drive plate is fixedly installed between the fan and the air outlet, so that the heat dissipation airflow is directed towards the drive plate body.

2. The serial heat dissipation structure for a DC motor module according to claim 1, characterized in that: The bracket has an air inlet on its side wall; the height of the air inlet is higher than the installation height of the fan; the air inlet serves as the air intake end. The outer casing surface is provided with an open connecting portion, allowing airflow to enter and exit the interior of the casing through the connecting portion; the connecting portion includes a first connecting portion and a second connecting portion; the second connecting portion is located within the coverage area of ​​the bracket and serves as the air outlet; the first connecting portion is located outside the coverage area of ​​the bracket.

3. The serial heat dissipation structure for a DC motor module according to claim 2, characterized in that: The outer bottom of the housing is provided with a protruding structure; when the electrical appliance is placed horizontally, the protruding structure creates a gap at the bottom of the housing; the first connecting part is provided on the bottom surface of the housing and is located on the outer periphery of the bracket.

4. The serial heat dissipation structure for a DC motor module according to claim 2, characterized in that: The second connecting portion is located at the bottom of the side wall of the housing and is situated on the outer periphery of the drive plate, so that the heat dissipation airflow blowing toward the surface of the drive plate is output from the side.

5. The serial heat dissipation structure for a DC motor module according to claim 3, characterized in that: The bracket includes a vertically extending main housing, within which the fan and the drive plate are sequentially mounted from top to bottom; the bracket has an outwardly extending guide portion in the horizontal direction of the drive plate; the end of the guide portion covers the second connecting portion; the guide portion gradually tapers towards its end from its connection with the main housing.

6. The serial heat dissipation structure for a DC motor module according to claim 5, characterized in that: The support includes a detachable upper support and a lower support; The upper support includes a housing surrounding the outer periphery of the motor, with an opening at the bottom and several slots along the edge of the opening. The upper surface of the housing is horizontally expanded outward to form a tray-like structure. The tray-like structure has an opening through which the output axis of the motor passes upward. The lower support includes a cover with openings at the top and bottom, and the guide portion is disposed on the cover; When the upper bracket and the lower bracket are connected, the lower end of the upper bracket is inserted into the upper opening of the lower bracket, so that the slot is formed as the air inlet; the motor is fixedly connected to the upper bracket; the lower end of the lower bracket is fixedly connected to the bottom of the outer shell; and the drive plate is fixed inside the lower bracket.

7. The serial heat dissipation structure for a DC motor module according to claim 6, characterized in that: The lower surface of the tray-shaped structure is provided with a downwardly protruding mounting post, the mounting post having a threaded hole with the opening facing downwards; the lower bracket has a vertically extending connecting post; The connecting column has a hollow channel; the hollow channel has an annular limiting part, and a positioning groove is formed on the annular limiting part; During assembly, the mounting post is inserted into the positioning groove, and the screw passes through the annular limiting part from bottom to top to connect with the threaded hole.

8. The serial heat dissipation structure for a DC motor module according to claim 6, characterized in that: The inner surface of the bottom of the outer casing has a raised limiting frame; a vertically extending connecting post is provided along the limiting frame; The connecting column has a hollow channel; the hollow channel has an annular limiting part, and a positioning groove is formed on the annular limiting part; The lower bracket has a protruding and vertically extending mounting post on its outer periphery, and the mounting post has a threaded hole with the opening facing downward. During assembly, the limiting frame surrounds the bottom outer perimeter of the lower bracket; the mounting post is embedded in the positioning groove, and a screw passes through the annular limiting part from bottom to top, engaging with the threaded hole.

9. The serial heat dissipation structure for a DC motor module according to claim 1, characterized in that: The motor is located directly above the fan; the output shaft of the motor extends downward and is connected to the fan.

10. A soymilk maker, employing a serial heat dissipation structure for a DC motor module as described in any one of claims 1 to 9; characterized in that: The soymilk maker is the aforementioned electrical appliance; the soymilk maker includes an inner cup, which is located above the motor and inside the outer casing; a rotating blade is provided inside the inner cup; the output axis of the motor extends upward and is connected to the rotating blade; a heating unit is provided at the outer bottom of the inner cup for heating the inner cup.

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