Thermal protection energy-saving motor and chef machine

Abstract

A thermal protection energy-saving motor and a chef machine relate to the technical field of chef machines, and comprise a motor body, a cooling fan, a rotating shaft and a thermal protection clutch. The rotating shaft is divided into an output end and a heat dissipation end, and the heat dissipation fan is fixedly connected with the heat dissipation end. The thermal protection clutch comprises a connecting seat, a transmission shaft and an output seat. The connecting base is provided with a driving cavity, the transmission shaft is arranged in the driving cavity, the top of the transmission shaft is provided with driving clamping teeth, and the bottom and the driving cavity form an expansion chamber. The output base sleeves the connecting base, a containing cavity and a first reset spring are arranged in the output base, and the containing cavity communicates with the driving cavity through a connecting channel. In a normal state, the first reset spring enables the driving latch to be meshed with the driven latch, and power transmission is ensured; when the temperature of the motor rises, the expansion chamber is heated, the air pressure is increased, the driving latch is pushed to break away from the driven latch, load power transmission is cut off, and meanwhile the cooling fan continues to operate for heat dissipation. The overheat shutdown of the motor due to overload can be avoided, the shutdown time is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of energy-saving motors and mixers. Background Art

[0002] As an electric device widely used in household and commercial kitchens, a mixer is mainly used for food processing tasks such as stirring, kneading, and beating eggs. Due to its variable workload (such as high torque requirements during kneading), the motor often operates under high load and is prone to a sharp rise in temperature due to overload or long-term operation. In addition, the kitchen environment usually has a high temperature and limited ventilation conditions, further exacerbating the risk of motor overheating. Motor overheating not only reduces the performance of the device but may also damage the internal components of the motor and even pose a safety hazard. Existing mixers usually adopt traditional thermally protected motors, which achieve real-time monitoring and automatic protection of the motor temperature by integrating a thermal protection device (such as a thermistor or a thermal element) inside the motor. When the motor temperature exceeds the set threshold, the thermal protection device automatically cuts off the power supply to prevent the motor from being damaged by overheating. However, after the power supply is cut off, the motor stops rotating, and the built-in cooling fan of the motor also stops accordingly. It is necessary to wait for the motor to cool down naturally. Its cooling effect after shutdown is poor, and the shutdown waiting time is long, which is not conducive to food processing efficiency. Summary of the Invention

[0003] In view of this, the present invention provides a thermally protected energy-saving motor and a mixer, which have a short shutdown waiting time and higher food processing efficiency.

[0004] To achieve the above object, the present invention provides the following technical solutions.

[0005] A thermally protected energy-saving motor includes a motor body, a cooling fan, a rotating shaft, and a thermal protection clutch for connecting with a load. The rotating shaft includes an output end and a cooling end. The cooling fan is fixedly connected to the cooling end of the rotating shaft. The thermal protection clutch includes: A connecting seat, which is internally provided with a driving cavity. One end of the connecting seat close to the driving cavity is fixedly connected to the output end of the rotating shaft, and an opening is provided at the upper end of the driving cavity; A transmission shaft, which is in transmission connection with the connecting seat. The transmission shaft is arranged in the driving cavity and extends out from the opening. The upper part of the transmission shaft is provided with driving active teeth for transmission. The bottom of the transmission shaft is in close sliding connection with the inner wall of the driving cavity to form an expansion chamber; An output seat, which is sleeved on the outer surface of the connecting seat and is rotatably connected to the connecting seat coaxially. The output seat is internally provided with a receiving cavity and a first return spring. A connecting channel for mutual communication is provided between the receiving cavity and the driving cavity. The top of the transmission shaft is located in the receiving cavity. A driven tooth matching the active tooth is provided in the receiving cavity. The first return spring is respectively connected to the top of the transmission shaft and the top of the receiving cavity to drive the active tooth and the driven tooth to remain engaged; When the expansion chamber is heated, the internal air pressure increases to push the active cogs out of contact with the driven cogs.

[0006] Under normal conditions, the first return spring keeps the active cogs and the driven cogs engaged, ensuring stable transmission of the motor power to the load. When the motor temperature rises, heat is transferred through the rotating shaft to the drive seat, causing the expansion chamber to be heated and the internal air pressure to gradually increase. When the temperature reaches the threshold value, the air pressure in the expansion chamber also rises high enough to push the active cogs out of contact with the driven cogs, thereby automatically cutting off the power transmission to the load, while the heat dissipation end of the rotating shaft continues to drive the cooling fan to operate for heat dissipation. Since a relatively large current passes through the stator and rotor windings during the motor's load operation, the heat generated by copper loss is also large. After unloading the load, the motor current decreases significantly, and the heat generated by copper loss will be reduced, which helps to lower the motor temperature. The motor itself has a certain heat dissipation capacity. After unloading the load, due to the reduced heat generation and the cooling fan still operating normally, the heat dissipation is relatively enhanced, enabling the heat to be dissipated to the surrounding environment faster, prompting the motor temperature to drop faster, without the need to stop the machine and wait for it to cool naturally. Therefore, this technical solution can avoid overheating shutdown of the motor caused by continuous overload, without the need to cut off the power for shutdown and cooling. Its heat dissipation is faster, it can reduce the shutdown time of the motor, and the working efficiency is higher.

[0007] Further, a pin mechanism is provided in the drive cavity. The pin mechanism includes a first pin assembly and a second pin assembly: The first pin assembly is used to keep the active cogs and the driven cogs engaged, and it includes: A first pin cavity that communicates with the expansion chamber; A first telescopic pin that is slidably and sealingly arranged in the first pin cavity to be able to extend and retract from the first pin cavity. A one-way inclined surface is provided at the top of the first telescopic pin, and the one-way inclined surface is configured to allow the transmission shaft to move unidirectionally downward only along the one-way inclined surface from above; A first pin spring is arranged in the first pin cavity and is used to push the first telescopic pin to reset and extend; The second pin assembly is used to keep the active cogs and the driven cogs separated, and it includes: A second pin cavity that communicates with the expansion chamber; A second telescopic pin that is slidably and sealingly arranged in the second pin cavity to be able to extend and retract from the second pin cavity. A reverse one-way inclined surface is provided at the top of the second telescopic pin, and the reverse one-way inclined surface is configured to allow the transmission shaft to move unidirectionally upward only along the reverse one-way inclined surface from below; A second pin spring is arranged in the second pin cavity and is used to pull the second telescopic pin to reset and retract; Wherein, when the air pressure in the expansion chamber increases: The first telescopic pin is compressed and gradually retracts into the first pin cavity until the locking of the transmission shaft is released; The second telescopic pin is pressed to extend out of the second pin cavity so as to be able to lock the transmission shaft at the separation position; When the air pressure in the expansion chamber decreases: The second telescopic pin retracts into the second pin cavity to release the lock on the transmission shaft; The first pin spring pushes the first telescopic pin to reset and extend so as to be able to lock the transmission shaft at the meshing position.

[0008] Since the temperature of the motor rises and falls relatively slowly, the speed of meshing and separating between the driving gear teeth and the driven gear teeth is slow. During the meshing and separating process, the contact area between the driving gear teeth and the driven gear teeth is small at the initial stage of meshing and the late stage of separation. Running at this position for a long time will aggravate the wear of the tooth surface, and there will be a jamming phenomenon, affecting the running stability of the motor. By setting the pin mechanism, the meshing and separating of the driving gear teeth and the driven gear teeth can be faster. Only when a certain temperature and air pressure are reached, the pin mechanism unlocks the transmission shaft, and the transmission shaft immediately moves at the moment of unlocking, rather than moving slowly with the rise or fall of temperature and air pressure, avoiding the driving gear teeth and the driven gear teeth from running at the position of the initial stage of meshing or the late stage of separation for a long time and aggravating the wear of the tooth surface.

[0009] Furthermore, the thermal protection clutch further includes a friction mechanism. The friction mechanism includes a friction ring sleeved on the top of the transmission shaft and a friction sleeve arranged in the accommodation cavity. The friction sleeve includes: A sleeve part which is sleeved on the inner wall of the accommodation cavity; A friction part for contacting with the friction ring, which is composed of a plurality of arc-shaped friction plates. Each friction plate is sequentially joined to form an annular structure. The friction plates are connected to the inner wall of the sleeve part through elastic members so that the annular structure can expand and contract within a certain range.

[0010] Since the load and the driven gear teeth stop losing power after the driving gear teeth and the driven gear teeth are separated, while the motor is still running, the driving gear teeth will keep rotating driven by the rotating shaft. When the driving gear teeth and the driven gear teeth resume meshing later, the rotational speed difference between the two is large, and the impact at the moment of contact between the gear teeth is severe, which easily causes damage to the tooth surface. By setting the friction mechanism, when the transmission shaft drives the driving gear teeth to reset, it will first pass through the friction part, so that the friction ring of the transmission shaft contacts the friction plates of the friction part. The friction between the two will, on the one hand, drive the output seat to rotate to a certain extent, and on the other hand, reduce the rotational speed of the transmission shaft. In this way, the speed difference between the driving gear teeth and the driven gear teeth is reduced, thereby reducing the collision impact at the moment of contact between the gear teeth.

[0011] Further, a deflating plunger capable of being inserted into the connection channel is provided on the transmission shaft. The deflating plunger is provided with a deflating hole. When the deflating plunger is inserted into or withdrawn from the connection channel, the airflow between the driving chamber and the accommodating chamber flows through the deflating hole. Due to the provision of the detent mechanism, the transmission shaft will act instantaneously after being unlocked, and its speed is relatively fast. Especially during the meshing process of the driving dog and the driven dog, it is easy to cause axial impact damage to both of them. In the case where the friction mechanism is provided, if the transmission shaft passes through the friction part too quickly, it may also cause the contact time between the friction ring and the friction plate to be too short, the output seat is not driven, and the rotational speed of the transmission shaft does not decrease effectively, resulting in the rotational speed difference between the driving dog and the driven dog not being reduced, and the rotational impact during meshing is still very large. During the ascending and descending processes of the transmission shaft, the airflow between the driving chamber and the accommodating chamber flows through the connection channel. Therefore, by providing a deflating plunger on the transmission shaft, after the transmission shaft is pushed upward by air pressure, the deflating plunger is inserted into the connection channel. When the transmission shaft resets and descends, the airflow between the driving chamber and the accommodating chamber can only flow slowly through the deflating hole of the deflating plunger at the beginning, thereby reducing the speed of the transmission shaft when it starts to descend. Only after the deflating plunger is completely withdrawn from the connection channel can the transmission shaft descend at a normal speed. At this time, the axial impact between the driving dog and the driven dog is weakened. In the case where the friction mechanism is provided, the slow descent of the transmission shaft at the beginning can extend the contact time between the friction ring and the friction part, increase the rotational speed of the output seat, and reduce the rotational speed of the transmission shaft, so as to better reduce the speed difference between the driving dog and the driven dog and weaken the rotational impact.

[0012] Further, sodium bicarbonate powder or ether is provided in the expansion chamber.

[0013] Further, the present invention also provides a cooking machine, which adopts a thermally protected energy-saving motor. The thermally protected energy-saving motor is arranged in the cooking machine. The cooking machine further includes a housing, a mixing bowl, a transmission mechanism, and a mixing mechanism. The transmission mechanism is in transmission connection with the thermally protected energy-saving motor and the mixing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional structural schematic diagram of the thermally protected energy-saving motor of the present invention.

[0015] Figure 2 is an exploded view of the thermally protected energy-saving motor of the present invention.

[0016] Figure 3 is a three-dimensional cross-sectional view of the thermal protection clutch.

[0017] Figure 4 is a cross-sectional view of the thermal protection clutch when the driving dog and the driven dog are meshed; Figure 5 is a cross-sectional view of the thermal protection clutch when the driving dog and the driven dog are separated; Figure 6 is Figure 5 an enlarged schematic view of part A in Figure 7 is a cross-sectional view of the thermal protection clutch in another direction when the driving dog teeth and the driven dog teeth are engaged; Figure 8 is a cross-sectional view of the thermal protection clutch in another direction when the driving dog teeth and the driven dog teeth are separated; Figure 9 is Figure 8 an enlarged schematic view of part B in Figure 10 is a three-dimensional cross-sectional view of the friction sleeve; Figure 11 is a three-dimensional structural schematic view of the cooking machine of the present invention; Figure 12 is a three-dimensional cross-sectional view of the cooking machine of the present invention; The reference numerals include: Thermal protection energy-saving motor 1, motor body 11, cooling fan 12, rotating shaft 13, output end 131, heat dissipation end 132; Thermal protection clutch 2, connecting seat 21, driving cavity 211, opening 212, transmission shaft 22, driving dog teeth 221, expansion chamber 222, air release plunger 223, air release hole 2231, output seat 23, accommodating cavity 231, first return spring 232, connecting channel 233, driven dog teeth 234; First pin cavity 3, first telescopic pin 31, first pin spring 32, second pin cavity 33, second telescopic pin 34, second pin spring 35; Friction ring 4, friction sleeve 41, sleeve part 411, friction part 412, friction plate 4121; Housing 5, mixing bowl 6, transmission mechanism 7, driving pulley 71, driven pulley 72, transmission belt 73, mixing mechanism 8. Specific embodiments

[0018] The following specifically describes the present invention with reference to specific embodiments.

[0019] Combined with Figures 1 - 3 , a thermal protection energy-saving motor of this embodiment includes a motor body 11, a cooling fan 12, a rotating shaft 13, and a thermal protection clutch 2 for connecting with a load. The rotating shaft 13 includes an output end 131 and a heat dissipation end 132. The cooling fan 12 is fixedly connected to the heat dissipation end 132 of the rotating shaft 13, and the thermal protection clutch 2 is fixedly connected to the output end 131 of the rotating shaft 13. When the temperature of the motor body 11 exceeds the set threshold, its heat is transferred to the thermal protection clutch 2 through the rotating shaft 13, and the thermal protection clutch 2 disconnects the transmission connection with the load, while the rotating shaft 13 continues to drive the cooling fan 12 to rotate for heat dissipation.

[0020] As Figure 2 shown, the thermal protection clutch 2 includes a connecting seat 21, a transmission shaft 22 and an output seat 23. Combining Figures 4 - 5 , the transmission shaft 22 is provided with a driving engaging tooth 221, and a driven engaging tooth 234 is provided inside the output seat 23. The thermal protection clutch 2 controls the lifting of the transmission shaft 22 by the air pressure in the expansion chamber 222, thereby controlling the engagement and separation of the driving engaging tooth 221 and the driven engaging tooth 234, and further controlling the transmission connection with the load. Specifically, the connecting seat 21 is made of a metal with excellent heat conduction performance. Combining Figure 4 , a driving cavity 211 is provided inside the connecting seat 21. One end of the connecting seat 21 close to the driving cavity 211 is fixedly connected to the output end 131 of the rotating shaft 13, so that the rotating shaft 13 can drive the thermal protection clutch 2 to rotate. An opening 212 is provided at the upper end of the driving cavity 211. The transmission shaft 22 is arranged in the driving cavity 211 and extends out from the opening 212. The transmission shaft 22 is in transmission connection with the connecting seat 21 through the opening 212. Specifically, combining Figures 2 - 3 , the shapes of the transmission shaft 22 and the opening 212 match, for example, both are square, so that the connecting seat 21 can drive the transmission shaft 22 to rotate. The bottom of the transmission shaft 22 is a piston structure, which is in close sliding connection with the inner wall of the driving cavity 211 and forms an expansion chamber 222. The expansion chamber 222 also belongs to a part of the driving cavity 211, and the expansion chamber 222 will expand or contract as the transmission shaft 22 moves up and down. The output seat 23 is sleeved on the outer surface of the connecting seat 21 and is coaxially rotatably connected to the connecting seat 21 through a bearing (not labeled). An accommodation cavity 231 and a first return spring 232 are provided inside the output seat 23. A connecting channel 233 for mutual communication is provided between the accommodation cavity 231 and the driving cavity 211. The top of the transmission shaft 22 is located in the accommodation cavity 231. Combining Figures 4 - 5 , a driven engaging tooth 234 matching the driving engaging tooth 221 is provided in the accommodation cavity 231. The first return spring 232 is respectively connected to the top of the transmission shaft 22 and the top of the accommodation cavity 231 to drive the driving engaging tooth 221 and the driven engaging tooth 234 to remain engaged. When the expansion chamber 222 is heated, the gas inside expands and the air pressure increases to push the driving engaging tooth 221 out of contact with the driven engaging tooth 234. At this time, the connecting seat 21 drives the transmission shaft 22 to rotate idly, and the transmission shaft 22 will not drive the output seat 23 to rotate, so it will not drive the load. Preferably, sodium bicarbonate powder or ether is provided in the expansion chamber 222. The sodium bicarbonate powder is easily decomposed by heat. It starts to decompose at about 50 °C to generate carbon dioxide gas, further increasing the air pressure in the expansion chamber 222, and its decomposition reaction is reversible. When the temperature of the closed expansion chamber 222 decreases, sodium bicarbonate can be regenerated. Ether has a low boiling point, about 34.6 °C. When the temperature of the expansion chamber 222 rises, the ether is heated and vaporized, thereby further increasing the air pressure in the expansion chamber 222. When the temperature of the expansion chamber 222 drops, the ether liquefies again.

[0021] Under normal conditions, the driving dog 221 is kept engaged with the driven dog 234 under the action of the first return spring 232 to ensure stable transmission of the motor power to the load. When the motor temperature rises, the heat is transferred from the rotating shaft 13 to the connecting seat 21, and the expansion chamber 222 is heated accordingly, resulting in a gradual increase in the air pressure inside it. When the temperature reaches the set value, the air pressure in the expansion chamber 222 also rises to a level sufficient to push the driving dog 221 out of contact with the driven dog 234, thereby automatically cutting off the power transmission to the load, while the heat dissipation end 132 of the rotating shaft 13 continues to drive the cooling fan 12 to operate for heat dissipation. Since a relatively large current passes through the stator and rotor windings during the operation of the motor under load, the heat generated by copper loss is also large. After unloading the load, the motor current decreases significantly, and the heat generated by copper loss will decrease, which helps to lower the motor temperature. The motor itself has a certain heat dissipation capacity. After unloading the load, due to the reduced heat generation and the normal operation of the cooling fan 12, the heat dissipation is relatively enhanced, enabling the heat to be dissipated to the surrounding environment faster, promoting a faster decrease in the motor temperature, without the need to stop the machine and wait for it to cool naturally, without the need to cut off the power and stop the machine for cooling. Its heat dissipation is faster, the downtime of the motor can be reduced, and the working efficiency is higher. This thermal protection energy-saving motor 1 does not require additional electronic components and drive sources to monitor the temperature of the motor body 11 and control the engagement and separation of the driving dog 221 and the driven dog 234, so it can achieve the effect of energy saving.

[0022] Since the temperature of the motor rises and falls relatively slowly, the speed of engagement and separation between the driving dog 221 and the driven dog 234 is slow. During the engagement and separation process, the contact area between the driving dog 221 and the driven dog 234 is relatively small at the initial stage of engagement and the later stage of separation. Running at this position for a long time will exacerbate the wear of the tooth surface and cause jamming, affecting the running stability of the motor. Combining Figure 7 and Figure 8 , a pin mechanism is provided in the driving cavity 211 of this embodiment. The pin mechanism includes a first pin assembly and a second pin assembly. The first pin assembly is used to keep the driving dog 221 engaged with the driven dog 234, and it includes a first pin cavity 3, a first telescopic pin 31, and a first pin spring 32. The first pin cavity 3 is communicated with the expansion chamber 222. The first telescopic pin 31 is slidably and sealingly arranged in the first pin cavity 3 to be able to extend and retract from the first pin cavity 3. A one-way inclined surface is provided at the top of the first telescopic pin 31, and the one-way inclined surface is configured to allow the transmission shaft 22 to move only unidirectionally downward from above along the one-way inclined surface. The first pin spring 32 is arranged in the first pin cavity 3 and is used to push the first telescopic pin 31 to reset and extend; The second latch component is used to keep the driving latch teeth 221 and the driven latch teeth 234 separated, and it includes a second latch cavity 33, a second telescopic latch 34, and a second latch spring 35. The second latch cavity 33 communicates with the expansion chamber 222. The second telescopic latch 34 is slidably and sealingly arranged in the second latch cavity 33 so as to be able to extend out of and retract into the second latch cavity 33. A reverse one-way inclined surface is provided at the top of the second telescopic latch 34, and the reverse one-way inclined surface is configured to allow the transmission shaft 22 to move upward only in one direction along the reverse one-way inclined surface from below. The second latch spring 35 is a tension spring, and it is arranged in the second latch cavity 33 for pulling the second telescopic latch 34 to reset and retract.

[0023] See Figure 8 , the specific positions where the first latch cavity 3, the second latch cavity 33 communicate with the expansion chamber 222 are different. When the air pressure in the expansion chamber 222 increases: The first telescopic latch 31 gradually retracts into the first latch cavity 3 under the action of the air pressure in the expansion chamber 222 until the temperature rises to the set value, causing the air pressure to increase to completely push the first telescopic latch 31 to retract and release the locking of the transmission shaft 22; The second telescopic latch 34 overcomes the pulling force of the second latch spring 35 and extends out of the second latch cavity 33 under the action of the air pressure in the expansion chamber 222. When the transmission shaft 22 rises, it presses the second telescopic latch 34 into the second latch cavity 33 along the reverse one-way inclined surface, and after passing through, the second telescopic latch 34 extends out again under the action of the air pressure, thereby locking the transmission shaft 22 at the separated position; See Figure 7 , when the air pressure in the expansion chamber 222 decreases: The second telescopic latch 34 retracts into the second latch cavity 33 under the action of the second latch spring 35, releasing the locking of the transmission shaft 22; The first latch spring 32 pushes the first telescopic latch 31 to reset and extend. When the transmission shaft 22 descends, it presses the first telescopic latch 31 into the first latch cavity 3 along the one-way inclined surface, and after passing through, the first telescopic latch 31 extends out again under the action of the first latch spring 32, thereby locking the transmission shaft 22 at the meshing position.

[0024] By setting the latch mechanism, the driving latch teeth 221 and the driven latch teeth 234 can only mesh or separate when reaching a certain temperature and air pressure, enabling the transmission shaft 22 to act quickly immediately at the moment of unlocking, rather than acting slowly with the slow rise or fall of temperature and air pressure, avoiding the driving latch teeth 221 and the driven latch teeth 234 from operating at the position in the initial stage of meshing or the late stage of separation for a long time and exacerbating the wear of the tooth surface.

[0025] After the driving dog 221 is separated from the driven dog 234, the load and the driven dog 234 will lose power and stop, while the motor is still running, and the driving dog 221 will keep rotating driven by the rotating shaft 13. When the driving dog 221 and the driven dog 234 resume meshing later, the rotational speed difference between the two is relatively large, and the impact at the moment of contact between the dogs is intense, which easily causes damage to the tooth surface. Combining Figure 2 、 Figure 3 and Figure 9 , the thermal protection clutch 2 of this embodiment further includes a friction mechanism. The friction mechanism includes a friction ring 4 sleeved on the top of the transmission shaft 22 and a friction sleeve 41 arranged in the accommodation cavity 231. Combining Figures 9 - 10 , the friction sleeve 41 includes a sleeve portion 411 and a friction portion 412. The sleeve portion 411 is sleeved on the inner wall of the accommodation cavity 231. The friction portion 412 is composed of a plurality of arc-shaped friction plates 4121. Each friction plate 4121 is sequentially joined to form an annular structure. The friction plate 4121 is connected to the inner wall of the sleeve portion 411 through an elastic member, and the formed annular structure can expand and contract within a certain range.

[0026] During the process of the transmission shaft 22 driving the driving dog 221 to reset and descend, the friction ring 4 contacts the friction plates 4121 of the friction portion 412. On the one hand, the frictional force between the two will drive the output seat 23 to rotate to a certain extent, so that the output seat 23 has a certain initial velocity. On the other hand, the output seat 23 will reduce the rotational speed of the transmission shaft 22. In this way, the speed difference between the driving dog 221 and the driven dog 234 is reduced, thereby reducing the collision impact at the moment of contact between the dogs.

[0027] Due to the setting of the pin mechanism, the transmission shaft 22 will act instantaneously after being unlocked, and its speed is relatively fast. Especially during the meshing process of the driving dog 221 and the driven dog 234, it is easy to cause damage to both of them due to axial impact. In the case where the friction mechanism is provided, if the transmission shaft 22 passes through the friction portion 412 too quickly, it may also cause the contact time between the friction ring 4 and the friction plates 4121 to be too short, the output seat 23 is not driven, and the rotational speed of the transmission shaft 22 does not effectively decrease, resulting in the rotational speed difference between the driving dog 221 and the driven dog 234 not being reduced, and the rotational impact during meshing is still large. Combining Figures 3 - 5, a drive shaft 22 is provided with a deflation plunger 223 that can be inserted into the connection channel 233. The deflation plunger 223 is provided with a deflation hole 2231, and the aperture of the deflation hole 2231 is very small, so the air flow rate is also very small. When the deflation plunger 223 is inserted into or withdrawn from the connection channel 233, the air flow between the drive cavity 211 and the accommodation cavity 231 can only flow through the deflation hole 2231. By providing the deflation plunger 223 on the drive shaft 22, after the drive shaft 22 is pushed up by air pressure, the deflation plunger 223 is inserted into the connection channel 233. When the drive shaft 22 resets and descends, the gas in the accommodation cavity 231 can only slowly flow into the drive cavity 211 through the deflation hole 2231 of the deflation plunger 223 at the beginning, so that the drive shaft 22 can only descend slowly at the beginning. After the deflation plunger 223 is completely withdrawn from the connection channel 233, the connection channel 233 is normally ventilated, and the drive shaft 22 can descend normally. At this time, the remaining distance between the driving engaging teeth 221 and the driven engaging teeth 234 is very small, and the axial impact between the driving engaging teeth 221 and the driven engaging teeth 234 is weakened. And in the case where a friction mechanism is provided, the slow descent of the drive shaft 22 at the beginning can extend the contact time between the friction ring 4 and the friction portion 412, increase the rotation speed of the output seat 23, and reduce the rotation speed of the drive shaft 22, so as to better reduce the speed difference between the driving engaging teeth 221 and the driven engaging teeth 234 and weaken the rotational impact. Combined with Figures 11 - 12 , this embodiment provides a cooking machine, which adopts the thermal protection energy-saving motor 1 provided in the above embodiment. The thermal protection energy-saving motor 1 is arranged in the cooking machine. The cooking machine further includes a housing 5, a mixing bowl 6, a transmission mechanism 7 and a mixing mechanism 8. The transmission mechanism 7 is in transmission connection with the thermal protection energy-saving motor 1 and the mixing mechanism 8. The transmission mechanism 7 of this embodiment is a belt transmission mechanism 7, including a driving pulley 71, a driven pulley 72 and a transmission belt 73. Among them, the driving pulley 71 is fixedly connected to the output seat 23, and the driven pulley 72 is fixedly connected to the mixing mechanism 8. During the use of the cooking machine, put the ingredients into the mixing bowl 6, fix the mixing hook on the mixing mechanism 8, and place the mixing bowl 6 below the mixing mechanism 8. Turn on the power supply to start the operation. After the temperature of the thermal protection energy-saving motor 1 exceeds the set value due to long-term operation, the thermal protection energy-saving motor 1 disconnects the transmission connection with the mixing mechanism 8, and the cooling fan 12 continues to operate. The specific working principle will not be elaborated here. After the temperature of the thermal protection energy-saving motor 1 decreases, the thermal protection energy-saving motor 1 reconnects the transmission connection with the mixing mechanism 8. After the mixing is completed, first turn off the power supply of the cooking machine, then remove the mixing hook, and finally take down the mixing bowl 6.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A thermal protection energy-saving motor, comprising a motor body, a cooling fan and a rotating shaft, wherein the rotating shaft comprises an output end and a cooling end, and the cooling fan is fixedly connected to the cooling end of the rotating shaft, characterized in that: Also included is a thermal protection clutch for connection with a load, the thermal protection clutch comprising: A connecting seat, wherein a driving cavity is provided inside the connecting seat, one end of the connecting seat close to the driving cavity is fixedly connected to the output end of the rotating shaft, and an opening is provided at the upper end of the driving cavity; A transmission shaft is drivingly connected to the connecting seat, the transmission shaft is arranged in the driving cavity and extends from the opening, an active gear for transmission is arranged on the upper part of the transmission shaft, and the bottom of the transmission shaft is tightly slidably connected with the inner wall of the driving cavity to form an expansion chamber; The output seat is sleeved on the outer surface of the connecting seat and is coaxially rotatably connected with the connecting seat. A receiving chamber and a first return spring are provided inside the output seat. A connecting channel for mutual communication is provided between the receiving chamber and the driving chamber. The top of the transmission shaft is located in the receiving chamber. A driven tooth matching the active tooth is provided in the receiving chamber. The first return spring is respectively connected to the top of the transmission shaft and the top of the receiving chamber to drive the active tooth to keep meshing with the driven tooth. When the expansion chamber is heated, the internal air pressure increases to push the active latching gear out of contact with the driven latching gear.

2. The thermal protection energy-saving motor according to claim 1, characterized in that: A bayonet mechanism is provided in the driving cavity, and the bayonet mechanism includes a first bayonet assembly and a second bayonet assembly: The first bayonet assembly is used to keep the active bayonet teeth engaged with the driven bayonet teeth, and comprises: a first bayonet cavity in communication with the expansion chamber; A first telescopic bayonet, whose sliding seal is arranged in the first bayonet cavity so as to be able to extend and retract into the first bayonet cavity, and a one-way inclined surface is arranged on the top of the first telescopic bayonet, and the one-way inclined surface is configured to allow the transmission shaft to move only in one direction downward from the top along the one-way inclined surface; A first bayonet spring, disposed in the first bayonet cavity, for pushing the first telescopic bayonet to return and extend; The second latch assembly is used to keep the active latching gear and the driven latching gear separated, and comprises: a second bayonet cavity, which is in communication with the expansion chamber; A second telescopic bayonet, whose sliding seal is arranged in the second bayonet cavity so as to be able to extend and retract into the second bayonet cavity, and a reverse one-way inclined surface is arranged on the top of the second telescopic bayonet, and the reverse one-way inclined surface is configured to allow the transmission shaft to move upward from below in one direction only along the reverse one-way inclined surface; A second bayonet spring is disposed in the second bayonet cavity and is used to pull the second telescopic bayonet to reset and retract; Among them, when the air pressure in the expansion chamber increases: The first telescopic bayonet is compressed and gradually retracts into the first bayonet cavity until the transmission shaft is unlocked; The second telescopic bayonet is pressed and extends out of the second bayonet cavity to lock the transmission shaft in a separated position; When the air pressure in the expansion chamber decreases: The second telescopic bayonet retracts into the second bayonet cavity to release the lock on the transmission shaft; The first bayonet spring pushes the first telescopic bayonet to return and extend, so as to lock the transmission shaft in the meshing position.

3. The thermal protection energy-saving motor according to claim 1, characterized in that: The thermal protection clutch also includes a friction mechanism, which includes a friction ring sleeved on the top of the transmission shaft and a friction sleeve arranged in the accommodating cavity, and the friction sleeve includes: A sleeve portion, which is sleeved on the inner wall of the accommodating cavity; The friction part is used to contact the friction ring. It is composed of multiple arc-shaped friction plates. The friction plates are assembled in sequence to form an annular structure. The friction plates are connected to the inner wall of the sleeve part through elastic parts so that the annular structure can expand and shrink within a certain range.

4. The thermal protection energy-saving motor according to claim 2 or 3, characterized in that: The transmission shaft is provided with a deflation plunger which can be inserted into the connecting channel. The deflation plunger is provided with a deflation hole. When the deflation plunger is inserted into or withdrawn from the connecting channel, the air flow between the driving cavity and the accommodating cavity flows through the deflation hole.

5. The thermal protection energy-saving motor according to claim 1, 2, 3 or 4, characterized in that: Sodium bicarbonate powder or ether is arranged in the expansion chamber.

6. A food processor, comprising the heat protection energy-saving motor according to any one of claims 1 to 5, wherein the heat protection energy-saving motor is arranged in the food processor, characterized in that: It also includes a shell, a stirring bowl, a transmission mechanism and a stirring mechanism, wherein the transmission mechanism is connected to the heat protection energy-saving motor and the stirring mechanism.

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