A liquid cooling circulation system of an external rotor motor based on magnetic refrigeration

Abstract

The utility model discloses a kind of outer rotor motor liquid cooling circulation systems based on magnetic refrigeration, comprising: outer rotor motor, outer rotor motor includes liquid cooling chamber, and stator assembly and rotor assembly are connected with inside and outside cover, stator assembly and / or rotor assembly are equipped with cooling liquid flow channel, stator assembly is equipped with liquid inlet and liquid outlet, cooling liquid flow channel is connected liquid inlet and liquid outlet through liquid cooling chamber;Magnetic refrigeration component, magnetic refrigeration component is communicated with liquid inlet and liquid outlet, to be used for cooling liquid cooling, magnetic refrigeration component includes magnetic heat material and magnetic field generating mechanism, magnetic field generating mechanism is used to magnetize demagnetized magnetic heat material;Radiating component, radiating component is communicated with magnetic refrigeration component, to be used for radiating magnetic refrigeration component.It can realize the circulating cooling of cooling liquid, to ensure the heat dissipation effect of cooling liquid, to meet the heat dissipation demand of outer rotor motor.

Description

Technical Field

[0001] This utility model relates to the field of liquid-cooled motor technology, specifically to a liquid-cooled circulation system for an external rotor motor based on magnetic refrigeration. Background Technology

[0002] External rotor motors are a common type of motor that achieves rotation based on the principle of electromagnetic induction. During operation, external rotor motors experience a decrease in efficiency due to rising temperatures, which also accelerates the aging and damage of internal components. Therefore, solving the heat dissipation problem of external rotor motors is crucial.

[0003] The common method for cooling external rotor motors is to encapsulate coolant inside the motor for heat dissipation and cooling. However, due to the limited amount of coolant that can be encapsulated inside an external rotor motor, the heat absorbed by the coolant is difficult to dissipate during long-term operation, resulting in a significant decrease in heat dissipation efficiency and failing to meet the cooling requirements of the external rotor motor. Utility Model Content

[0004] The purpose of this invention is to disclose a liquid cooling circulation system for an external rotor motor based on magnetic refrigeration, which can realize the circulation and cooling of the coolant to ensure the heat dissipation effect of the coolant and thus meet the heat dissipation requirements of the external rotor motor.

[0005] To achieve the above objectives, this utility model discloses a liquid cooling circulation system for an external rotor motor based on magnetic refrigeration, comprising:

[0006] An external rotor motor includes a liquid-cooled chamber, and an inner and outer stator assembly and a rotor assembly connected together. The stator assembly and / or the rotor assembly are provided with coolant channels. The stator assembly is provided with an inlet and an outlet. The coolant channels are connected to the inlet and outlet through the liquid-cooled chamber.

[0007] A magnetic refrigeration assembly is connected to an inlet and an outlet for cooling the coolant. The magnetic refrigeration assembly includes a magnetocaloric material and a magnetic field generating mechanism, which is used to magnetize the demagnetized magnetocaloric material.

[0008] A heat dissipation component is connected to a magnetic cooling component to dissipate heat from the magnetic cooling component.

[0009] In a preferred embodiment, the stator assembly includes a stator fixed shaft and a motor winding, and the rotor assembly includes a rotor permanent magnet and a rotor housing. The stator fixed shaft, motor winding, rotor permanent magnet and rotor housing are arranged sequentially from the inside out. A liquid cooling chamber is formed between the rotor housing and the stator fixed shaft. Coolant channels are formed on the inner side wall of the rotor housing and / or the outer side wall of the stator fixed shaft. The inlet and outlet of the coolant are located on the stator fixed shaft.

[0010] In a preferred embodiment, bearings are fitted at both axial ends of the stator fixed shaft, and the bearings are located between the stator fixed shaft and the rotor housing and fixed by bearing cover plates.

[0011] In a preferred embodiment, the stator fixed shaft, bearings, and rotor housing are sealed together by a sealing structure.

[0012] In a preferred embodiment, the magnetocaloric material is filled inside the magnetic carrier, and the heat dissipation component, the liquid inlet and the liquid outlet are all connected to the magnetic carrier to connect the magnetocaloric material;

[0013] The magnetic field generating mechanism includes a permanent magnet, a motor, and a rotating shaft. The output shaft of the motor is fixedly connected to the permanent magnet via the rotating shaft to drive the permanent magnet to move closer to or away from the magnetic carrier.

[0014] In a preferred embodiment, the heat dissipation component includes a cooling chamber and a semiconductor heat sink. The cooling chamber is connected to the magnetic refrigeration component, and the cold end of the semiconductor heat sink is attached to the cooling chamber.

[0015] In a preferred embodiment, the heat dissipation assembly further includes heat dissipation fins, which are disposed at the hot end of the semiconductor heat sink, and fans are provided at both the air inlet and air outlet ends of the heat dissipation fins.

[0016] In a preferred embodiment, a precooling chamber is provided along the flow path of the coolant from the cooling chamber to the magnetic refrigeration component;

[0017] And / or, a preheating chamber is provided between the liquid outlet and the magnetic refrigeration component;

[0018] And / or, a cold storage chamber is provided between the magnetic refrigeration component and the liquid inlet.

[0019] In a preferred embodiment, the magnetic carrier is equipped with a liquid pump for the channels, inlet, and outlet of the coolant.

[0020] In a preferred embodiment, the channels for coolant to enter the magnetic carrier and the channels for coolant to exit the magnetic carrier are staggered along the same coolant flow path.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] The external rotor motor is equipped with a liquid inlet, a liquid-cooled chamber, a coolant flow channel, and a liquid outlet connected in sequence. Both the inlet and outlet are connected to a magnetic refrigeration assembly. This allows for the circulation of coolant using the external rotor motor, the magnetic refrigeration assembly, and their associated heat dissipation components. Low-temperature coolant is delivered to the external rotor motor to absorb heat, which then dissipates heat from the internal rotor motor. The high-temperature coolant, after absorbing heat, is then delivered to the magnetic refrigeration assembly for cooling to achieve a low-temperature coolant. Thus, during prolonged operation and heat generation of the external rotor motor, the coolant can promptly absorb heat from the motor and dissipate it via the magnetic refrigeration assembly, ensuring the external rotor motor's heat dissipation efficiency and improving its performance and lifespan. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the liquid cooling circulation system of the external rotor motor based on magnetic refrigeration according to this utility model;

[0025] Figure 2 This is an axial sectional view of the external rotor motor of this utility model;

[0026] Figure 3 This is a schematic diagram of the stator fixing shaft of this utility model;

[0027] Figure 4 This is a schematic diagram of the rotor housing of this utility model;

[0028] Figure 5 This is a schematic diagram of the cooling principle of the liquid cooling cycle system for an external rotor motor based on magnetic refrigeration, which is based on this utility model.

[0029] Explanation of key figure labels:

[0030] 1. External rotor motor; 11. Coolant flow channel; 12. Liquid cooling chamber; 13. Stator fixed shaft; 131. Liquid inlet; 132. Liquid outlet; 14. Motor winding; 15. Rotor permanent magnet; 16. Rotor housing; 17. Bearing; 18. Bearing cover plate; 19. Sealing structure; 2. Magnetic refrigeration assembly; 21. Magnetothermal material; 22. Magnetic field generating mechanism; 221. Permanent magnet; 222. Motor; 223. 23. Rotating shaft; 34. Magnetic carrier; 35. Heat dissipation assembly; 36. Cooling chamber; 37. Semiconductor heat sink; 38. Heat dissipation fins; 39. Fan; 4. Pre-cooling chamber; 5. Preheating chamber; 6. Cold storage chamber; 70. Liquid pump; 71. Liquid pump one; 72. Liquid pump two; 73. Liquid pump three; 74. Liquid pump four; 75. Liquid pump five; 76. Liquid pump six; 77. Liquid pump seven; 78. Liquid pump eight; 79. Liquid pump nine; 710. Liquid pump ten. Detailed Implementation

[0031] 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 some embodiments of the present utility model, and not all embodiments. 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.

[0032] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0033] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0034] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0035] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0036] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0037] See Figure 1-4 This application provides a liquid cooling circulation system for an external rotor motor based on magnetic refrigeration, including: an external rotor motor 1, a magnetic refrigeration component 2, and a heat dissipation component 3.

[0038] See Figure 2-4 The external rotor motor 1 includes a liquid-cooled chamber 12, and a stator assembly and a rotor assembly connected inside and outside the chamber. The stator assembly and / or the rotor assembly are provided with a coolant flow channel 11. The stator assembly is provided with a liquid inlet 131 and a liquid outlet 132. The coolant flow channel 11 is connected to the liquid inlet 131 and the liquid outlet 132 via the liquid-cooled chamber 12.

[0039] The external rotor motor 1 operates based on the principle of magnetic induction. During operation, the external rotor motor 1 generates heat, and excessive heat generation can negatively impact its performance and lifespan. To dissipate heat from the external rotor motor 1, coolant is typically used. The inlet 131 allows low-temperature coolant to enter the external rotor motor 1, flowing sequentially along the liquid-cooled chamber 12 to the coolant channel 11. After absorbing heat and cooling the external rotor motor 1, the coolant flows out from 132. The liquid-cooled chamber 12 can be located only in the stator assembly or between the stator and rotor assemblies.

[0040] See Figure 1 The magnetic cooling component 2 is connected to the inlet 131 and outlet 132 to cool the coolant. The magnetic cooling component 2 includes a magnetothermal material 21 and a magnetic field generating mechanism 22, which magnetizes the demagnetized magnetothermal material 21. The heat dissipation component 3 is connected to the magnetic cooling component 2 to dissipate heat. Normally, the magnetothermal material 21 is demagnetized and can absorb heat from the coolant flowing out of the outlet 132 to cool the coolant. When the magnetic field generating mechanism 22 acts on the magnetothermal material 21, the magnetothermal material is magnetized and releases heat to the coolant flowing out of the outlet 132 to raise the coolant temperature. The coolant flowing out of the outlet 132 flows through the magnetized magnetothermal material 21, which releases heat to the coolant. The coolant, carrying heat, is cooled by the heat dissipation component 3, thus achieving the purpose of dissipating heat from the magnetothermal material 21.

[0041] The external rotor motor 1 of this embodiment is provided with a liquid inlet 131, a liquid cooling chamber 12, a coolant flow channel 11, and a liquid outlet 132 connected in sequence. Both the liquid inlet 131 and the liquid outlet 132 are connected to the magnetic refrigeration assembly 2. This allows for the circulation of coolant using the external rotor motor 1, the magnetic refrigeration assembly 2, and the configured heat dissipation assembly 3. Low-temperature coolant is delivered to the external rotor motor 1 to absorb heat and dissipate heat, while the high-temperature coolant after heat absorption is delivered to the magnetic refrigeration assembly 2 for cooling to obtain low-temperature coolant. Thus, during the long-term operation and heat generation of the external rotor motor 1, the coolant can promptly absorb the heat from the external rotor motor 1 and dissipate it via the magnetic refrigeration assembly 2, thereby ensuring the heat dissipation efficiency of the external rotor motor 1 and improving its performance and lifespan.

[0042] It should be noted that the coolant flow channel 11 can be provided only in the stator assembly, only in the rotor assembly, or both the stator assembly and the rotor assembly can be provided with coolant flow channels, depending on the cooling requirements.

[0043] It should be noted that the external rotor motor 1 in this embodiment can be an axial flux motor or a radial flux motor, and the specific location of the liquid cooling chamber 12 is set according to the type of the external rotor motor 1.

[0044] See Figure 2-4 The stator assembly includes a stator fixed shaft 13 and a motor winding 14, and the rotor assembly includes a rotor permanent magnet 15 and a rotor housing 16. The stator fixed shaft 13, the motor winding 14, the rotor permanent magnet 15 and the rotor housing 16 are arranged sequentially from the inside out. A liquid cooling chamber 12 is formed between the rotor housing 16 and the stator fixed shaft 13. A coolant flow channel 11 is formed on the inner side wall of the rotor housing 16 and / or the outer side wall of the stator fixed shaft 13. A liquid inlet 131 and a liquid outlet 132 are provided on the stator fixed shaft 13.

[0045] The rotor housing 16 includes an upper shell and a lower shell that are fitted together. The stator fixed shaft 13, motor windings 14, and rotor permanent magnets 15 are all housed within the cavity formed by the upper and lower shells. During operation, the external rotor motor 1 generates heat, particularly between the stator and rotor assemblies, inside the stator assembly, and inside the rotor assembly. The liquid cooling chamber 12 cools the stator and rotor assemblies. Multiple axially extending coolant channels 11 are provided on the inner wall of the rotor housing 16 and the outer wall of the stator fixed shaft 13 to cool the interior of the stator and rotor assemblies. These coolant channels 11 and the liquid cooling chamber 12 are directly or indirectly connected to the inlet 131 and outlet 132 to achieve effective heat dissipation within the external rotor motor 1.

[0046] In one or more embodiments, bearings 17 are sleeved at both axial ends of the stator fixed shaft 13. The bearings 17 are located between the stator fixed shaft 13 and the rotor housing 16 and are fixed by bearing cover plates 18. The bearings 17 ensure smooth rotation between the stator assembly and the rotor assembly. The bearing cover plates 18 limit the bearings 17 to prevent them from detaching from the stator fixed shaft 13.

[0047] The stator fixed shaft 13, bearing 17, and rotor housing 16 are sealed together by a sealing structure 19. The sealing structure 19 prevents coolant leakage. The sealing structure 19 can be an oil seal, sealing ring, sealing ring, fluid seal, etc. The specific selection of the sealing structure 19 depends on the actual requirements, as long as it can provide a good sealing effect.

[0048] See Figure 1 The magnetothermal material 21 is filled inside the magnetic carrier 23. The heat dissipation component 3, the liquid inlet 131, and the liquid outlet 132 are all connected to the magnetic carrier 23 to connect the magnetothermal material 21. The magnetic field generating mechanism 22 includes a permanent magnet 221, a motor 222, and a rotating shaft 223. The output shaft of the motor 222 is fixedly connected to the permanent magnet 221 via the rotating shaft 223 to drive the permanent magnet 221 to move closer to or away from the magnetic carrier 23.

[0049] The magnetic carrier 23 can be a chamber, a bed, or any other structure that can be filled with magnetothermal material 21. Coolant flows into the magnetic carrier 23 and passes through the magnetothermal material 21 inside, thereby achieving the purpose of absorbing or releasing heat. The magnetization and heat release or demagnetization and heat absorption of the magnetothermal material 21 is achieved through the motor 222, the rotating shaft 223, and the permanent magnet 221. When the motor 222 drives the permanent magnet 221 close to the magnetic carrier 23 via the rotating shaft 223, the magnetothermal material 21 is magnetized to release heat to the coolant. When the motor 222 drives the permanent magnet 221 away from the magnetic carrier 23 via the rotating shaft 223, the magnetothermal material 21 is demagnetized to absorb heat from the coolant.

[0050] In one or more embodiments, two magnetic carriers 23 are spaced apart, and each magnetic carrier 23 is filled with magnetocaloric material 21. The magnetic field generating mechanism 22 sequentially and intermittently magnetizes the magnetocaloric material 21 in the two magnetic carriers 23. The magnetized magnetocaloric material 21 releases heat to raise the temperature of the coolant, and the demagnetized magnetocaloric material 21 absorbs heat to lower the temperature of the coolant. In this way, the coolant flowing out of the outlet 132 of the external rotor motor 1 passes sequentially through the magnetized magnetocaloric material 21, the heat dissipation component 3, and the demagnetized magnetocaloric material 21 to lower its temperature, and then flows into the external rotor motor 1 through the inlet 131 for further cooling.

[0051] The magnetothermal materials 21 in the two magnetic carriers 23 are magnetized and demagnetized in sequence, so that the two magnetic carriers 23 can work at the same time and the coolant can circulate. While some of the coolant carries away the heat from the magnetothermal materials 21, some of the coolant is cooled by the demagnetized magnetothermal materials 21, which improves the coolant circulation efficiency and allows the coolant to be continuously cooled, resulting in a lower coolant temperature, so as to ensure the cooling efficiency and cooling temperature of the external rotor motor 1.

[0052] It is worth noting that there can be more than two magnetic carriers 23, and their working principle is the same as or similar to that of the two magnetic carriers 23 mentioned above. There can be one permanent magnet 221, or there can be two or more, depending on the number of magnetic carriers 23 and the magnetization requirements.

[0053] The heat dissipation assembly 3 includes a cooling chamber 31 and a semiconductor heat sink 32. The cooling chamber 31 is connected to the magnetic cooling assembly 2, and the cold end of the semiconductor heat sink 32 is attached to the cooling chamber 31. The coolant flows through the magnetized magnetothermal material 21 and heats up. Then it flows into the cooling chamber 31, where the cold end of the semiconductor heat sink 32 absorbs the heat of the coolant to cool it down. The heat is then transferred to the hot end of the semiconductor heat sink 32 for dissipation. The coolant then flows back to the magnetized magnetothermal material 21 to cool down further.

[0054] The heat dissipation assembly 3 also includes heat dissipation fins 33, which are disposed at the hot end of the semiconductor heat sink 32. Fans 34 are provided at both the air inlet and outlet ends of the heat dissipation fins 33. During long-term operation of the liquid cooling circulation system, the heat dissipation from the hot end of the semiconductor heat sink 32 gradually slows down, thus affecting the cooling effect of the cooling chamber 31 on the coolant. This embodiment of the application addresses this by attaching auxiliary heat dissipation structures, namely heat dissipation fins 33 and fans 34, to the hot end of the semiconductor heat sink 32. Airflow over the heat dissipation fins 33 can carry away the heat from the hot end of the semiconductor heat sink 32, improving the heat dissipation effect of the heat dissipation assembly 3 and thus ensuring the cooling effect of the coolant.

[0055] A pre-cooling chamber 4 is provided on the flow path of the coolant from the cooling chamber 31 to the magnetic refrigeration component 2. The pre-cooling chamber 4 can further cool the coolant that has been cooled by the heat dissipation component 3. By setting the pre-cooling chamber 4, the coolant discharged from the heat dissipation component 3 can be received and temporarily stored, and the temperature of the coolant discharged from the heat dissipation component 3 can be adjusted and balanced. At the same time, the coolant can slowly enter the demagnetized magnetocaloric material 21 to ensure that the demagnetized magnetocaloric material can fully absorb the heat in the coolant to obtain a coolant with a lower temperature.

[0056] And / or, a preheating chamber 5 is provided between the outlet 132 and the magnetic cooling assembly 2. The preheating chamber 5 is provided to receive the coolant flowing out of the outlet 132 of the external rotor motor 1, so as to realize the temporary storage of coolant, thereby achieving balanced regulation of coolant temperature, and is conducive to increasing the amount of coolant, so that the coolant can slowly enter the magnetized magnetothermal material 21 and subsequent cooling components, to ensure that the coolant can be fully cooled.

[0057] And / or, a cold storage chamber 6 is provided between the magnetic refrigeration component 2 and the liquid inlet 131. The cold storage chamber 6 is mainly used to store the coolant after the demagnetized magnetothermal material 21 has been cooled, and then input into the external rotor motor 1 through the liquid inlet 131. The cold storage chamber 6 can both temporarily store the coolant, so that the small refrigeration equipment can adjust the amount and flow rate of coolant flowing into the liquid inlet 131 according to the cooling needs, ensuring on-demand cooling, and balance the coolant temperature and increase the total amount of coolant, so as to provide a large amount of coolant when there is a large cooling demand, thereby improving the cooling efficiency.

[0058] The magnetic carrier 23 is equipped with a liquid pump 7 in the channel for coolant inlet and outlet, the inlet 131, and the outlet 132. The liquid pump 7 in this embodiment can be a piezoelectric pump, which, compared with a mechanical pump, has the characteristics of high-precision flow control, no electromagnetic interference, simple and compact structure, low noise, fast response, good sealing, long service life, and small size. A liquid pump 1 71 is installed on the liquid inlet 131, a liquid pump 2 72 is installed on the liquid outlet 132, a liquid pump 3 73 is installed on the channel from the preheating chamber 5 to the first magnetic carrier 23, a liquid pump 4 74 is installed on the channel from the first magnetic carrier 23 to the cooling chamber 31, a liquid pump 5 75 is installed on the channel from the precooling chamber 4 to the second magnetic carrier 23, a liquid pump 6 76 is installed on the channel from the second magnetic carrier 23 to the cold storage chamber 6, a liquid pump 77 is installed on the channel from the preheating chamber 5 to the second magnetic carrier 23, a liquid pump 8 78 is installed on the channel from the second magnetic carrier 23 to the cooling chamber 31, a liquid pump 9 79 is installed on the channel from the precooling chamber 4 to the first magnetic carrier 23, and a liquid pump 10 710 is installed on the channel from the first magnetic carrier 23 to the cold storage chamber 6.

[0059] In one or more embodiments, the channels for coolant entry into the magnetic carrier 23 and the channels for coolant exit from the magnetic carrier 23 are staggered along the same coolant flow path. This increases the coolant flow path and improves heat exchange efficiency.

[0060] Combination Figure 5 The working process of the liquid cooling circulation system of the external rotor motor based on magnetic refrigeration according to the embodiments of this application will be described in detail below.

[0061] Liquid pump 71 delivers coolant from the cold storage chamber 6 to the liquid-cooled chamber 12 of the external rotor motor 1 via the inlet 131. The coolant then flows through the coolant channel 11 for cooling and to increase its heat absorption temperature. Liquid pump 72 then delivers the coolant to the preheating chamber 5 via the outlet 132. In the preheating chamber 5, the coolant enters the first magnetic carrier 23 under the action of liquid pump 73. At this time, the permanent magnet 221 approaches the first magnetic carrier 23, magnetizing the magnetothermal material 21 within it and releasing heat to the coolant entering the first magnetic carrier 23. The coolant, absorbing heat from the magnetothermal material 21 in the first magnetic carrier 23, is then delivered by liquid pump 74 to the cooling chamber 31 of the heat dissipation assembly 3. Heat is dissipated using semiconductor heat sinks 32 combined with heat dissipation fins 33 and a fan 34 to obtain a coolant at a lower temperature. The coolant cooled by the cooling chamber 31 then enters the precooling chamber 4 through pipes for temporary storage. The coolant in the precooling chamber 4 enters the second magnetic carrier 23 through the liquid pump 75. At this time, the permanent magnet 221 moves away from the second magnetic carrier 23, and the magnetothermal material 21 in the second magnetic carrier 23 is demagnetized, absorbing the heat in the coolant to cool it down. Then, the cooled coolant enters the cold storage chamber 6 through the liquid pump 76.

[0062] The coolant in the cold storage chamber 6 is then pumped by liquid pump 71 to the liquid cooling chamber 12 of the external rotor motor 1. It then flows through the coolant channel 11 for cooling and to raise the temperature of the coolant due to heat absorption. Under the action of liquid pump 72, the coolant is then pumped through the outlet 132 to the preheating chamber 5. At this time, the motor 222 drives the permanent magnet 221 to change position via the rotating shaft 223. The permanent magnet 221 moves close to the second magnetic carrier 23, where the magnetocaloric material 21 within the second magnetic carrier 23 is magnetized, while the magnetocaloric material 21 within the first magnetic carrier 23 is demagnetized. The coolant in the preheating chamber 5 enters the second magnetic carrier 23 under the action of liquid pump 77. The magnetocaloric material 21 within the second magnetic carrier 23 releases heat. The coolant that absorbs the heat from the magnetized magnetocaloric material 21 within the second magnetic carrier 23 is pumped by liquid pump 78 into the cooling chamber 31 of the heat dissipation assembly 3. Heat is dissipated using semiconductor heat sinks 32 combined with heat dissipation fins 33 and a fan 34 to obtain a coolant at a lower temperature. The coolant cooled by the cooling chamber 31 enters the pre-cooling chamber 4 through a pipe and is temporarily stored in the pre-cooling chamber 4. The coolant in the pre-cooling chamber 4 enters the first magnetic carrier 23 through the liquid pump 79. The magnetothermal material 21 in the first magnetic carrier 23 absorbs the heat in the coolant to cool it down. Then the cooled coolant enters the cold storage chamber 6 through the liquid pump 710.

[0063] This completes one refrigeration cycle.

[0064] The above provides a detailed description of a liquid-cooled circulation system for an external rotor motor based on magnetic refrigeration, as disclosed in the embodiments of this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the liquid-cooled circulation system for an external rotor motor based on magnetic refrigeration and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid-cooled circulation system for an external rotor motor based on magnetic refrigeration, characterized in that, include: An external rotor motor, the external rotor motor including a liquid-cooled chamber, and a stator assembly and a rotor assembly connected by inner and outer sleeves, the stator assembly and / or the rotor assembly having a coolant flow channel, the stator assembly having a coolant inlet and a coolant outlet, the coolant flow channel being connected to the coolant inlet and the coolant outlet via the liquid-cooled chamber; A magnetic refrigeration assembly, which is connected to the liquid inlet and the liquid outlet for cooling the coolant, includes a magnetocaloric material and a magnetic field generating mechanism, which is used to magnetize the demagnetized magnetocaloric material. A heat dissipation component, which is connected to the magnetic refrigeration component, for dissipating heat from the magnetic refrigeration component; The stator assembly includes a stator fixed shaft and a motor winding, and the rotor assembly includes a rotor permanent magnet and a rotor housing. The stator fixed shaft, the motor winding, the rotor permanent magnet, and the rotor housing are sequentially arranged from the inside out. The liquid cooling chamber is formed between the rotor housing and the stator fixed shaft. Coolant channels are formed on the inner side wall of the rotor housing and / or the outer side wall of the stator fixed shaft. The liquid inlet and the liquid outlet are located on the stator fixed shaft.

2. The liquid cooling circulation system for an external rotor motor based on magnetic refrigeration according to claim 1, characterized in that: Bearings are fitted at both axial ends of the stator fixed shaft. The bearings are located between the stator fixed shaft and the rotor housing and are fixed by bearing cover plates.

3. The liquid cooling circulation system for an external rotor motor based on magnetic refrigeration according to claim 2, characterized in that: The stator fixed shaft, the bearing, and the rotor housing are sealed together by a sealing structure.

4. The liquid-cooled circulation system for an external rotor motor based on magnetic refrigeration according to any one of claims 1-3, characterized in that: The magnetocaloric material is filled inside the magnetic carrier, and the heat dissipation component, the liquid inlet and the liquid outlet are all connected to the magnetic carrier to connect the magnetocaloric material; The magnetic field generating mechanism includes a permanent magnet, a motor, and a rotating shaft. The output shaft of the motor is fixedly connected to the permanent magnet via the rotating shaft to drive the permanent magnet to move closer to or away from the magnetic carrier.

5. The liquid-cooled circulation system for an external rotor motor based on magnetic refrigeration according to any one of claims 1-3, characterized in that: The heat dissipation component includes a cooling chamber and a semiconductor heat sink. The cooling chamber is connected to the magnetic refrigeration component, and the cold end of the semiconductor heat sink is attached to the cooling chamber.

6. The liquid-cooled circulation system for an external rotor motor based on magnetic refrigeration according to claim 5, characterized in that: The heat dissipation assembly also includes heat dissipation fins, which are disposed at the hot end of the semiconductor heat sink, and fans are provided at both the air inlet and air outlet ends of the heat dissipation fins.

7. The liquid cooling circulation system for an external rotor motor based on magnetic refrigeration according to claim 5, characterized in that: A pre-cooling chamber is provided along the flow path of the coolant from the cooling chamber to the magnetic refrigeration component; And / or, a preheating chamber is provided between the liquid outlet and the magnetic refrigeration component; And / or, a cold storage chamber is provided between the magnetic refrigeration component and the liquid inlet.

8. The liquid cooling circulation system for an external rotor motor based on magnetic refrigeration according to claim 4, characterized in that: The magnetic carrier is equipped with a liquid pump for the channel for coolant entry and exit, the inlet, and the outlet.

9. The liquid cooling circulation system for an external rotor motor based on magnetic refrigeration according to claim 8, characterized in that: On the same coolant flow path, the channel for coolant to enter the magnetic carrier and the channel for coolant to exit the magnetic carrier are misaligned.

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