Liquid-cooled casing, magnetic levitation electric motor and magnetic levitation apparatus
Patent Information
- Application Number
- PCT/CN2025/142189
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-26
- Filing Date
- 2025-12-12
- Publication Date
- 2026-10-01
Smart Images
Figure CN2025142189_01102026_PF_FP_ABST
Abstract
Description
Liquid-cooled housing, magnetic levitation motor and magnetic levitation equipment
[0001] Cross-references to related applications
[0002] This disclosure claims priority to Chinese Patent Application No. 202510368933.4, filed on March 26, 2025, entitled "Liquid-cooled housing, magnetic levitation motor and magnetic levitation device", the entire contents of which are incorporated herein by reference. Technical Field
[0003] This disclosure relates to the field of magnetic levitation motor technology, and in particular to a liquid-cooled housing, a magnetic levitation motor, and a magnetic levitation device. Background Technology
[0004] A magnetic levitation motor is a type of rotary actuator that uses magnetic force to levitate the rotor, so that there is no mechanical contact between the rotor and the stator. Magnetic levitation motors can be magnetic bearing motors, bearingless motors, or bearingless sheet motors, etc.
[0005] A magnetic bearing motor, also known as a magnetic bearing motor, is a motor that combines, rather than integrates, a rotary drive motor with an axial magnetic bearing or / and a radial magnetic bearing or / and a hybrid magnetic bearing.
[0006] A bearingless motor integrates rotation and levitation functions. In a bearingless motor, an additional winding generates an excitation magnetic field on top of the existing rotational drive magnetic field. The interaction of these two magnetic fields disrupts the original balanced distribution of the drive magnetic field, generating a radial force on the rotor. Levitation of the rotor is achieved by controlling this radial force. Compared to magnetic bearing motors, the magnetic levitation winding in a bearingless motor is wound on the stator, saving space and overcoming the disadvantages of large size and high cost associated with magnetic bearings. Early bearingless motors typically required two bearingless motors and one axial magnetic bearing to achieve rotor levitation in all five degrees of freedom.
[0007] Bearingless thin-plate motors are a special type of bearingless motor that inherits the advantages of bearingless motors. The rotor has a very small ratio of axial length to diameter, and is thin-plate shaped, eliminating the need for axial magnetic bearings. It uses bearingless technology to achieve active rotation and radial levitation of the rotor, and uses a magnetic circuit composed of mechanical structures to achieve passive levitation of the other three degrees of freedom besides radial and rotational degrees of freedom. It features high cleanliness, no precipitation, no particles, no dynamic seals, and superior performance, and has good application prospects in ultra-clean drive fields such as biochemistry, medicine, and semiconductor manufacturing.
[0008] Magnetic levitation motors can be assembled with different functional components to become magnetic levitation devices for various applications. In one embodiment, the magnetic levitation device can be configured as a magnetic levitation pump. In the application of the magnetic levitation pump, the magnetic levitation pump includes a magnetic levitation motor and a pump head. The pump head includes a pump casing and a rotor impeller disposed within the pump casing. The magnetic levitation rotor is both the rotor of the magnetic levitation motor and part of the rotor impeller of the pump. It can be, for example, a permanent magnet rotor, a short-circuit cage rotor, or a reluctance rotor. The magnetic levitation stator is configured to drive the rotor impeller to rotate and levitate. In another embodiment, the magnetic levitation device can be configured as a magnetic levitation mixer. In the application of the magnetic levitation mixer, the magnetic levitation mixer includes a magnetic levitation motor and a mixing device. The mixing device includes a mixing container and a rotor mixing head disposed within the mixing container. The magnetic levitation rotor is both the rotor of the magnetic levitation motor and part of the rotor mixing head of the mixing device. The magnetic levitation stator is configured to drive the rotor mixing head to rotate and levitate.
[0009] Currently, the magnetic levitation motors used in magnetic levitation pumps or magnetic levitation mixers primarily employ air cooling. This generally falls into two categories. One type involves attaching a shroud and cooling fan to the bottom of the motor housing. Traditional cooling fans suffer from mechanical wear, generate particles, have low cleanliness, and lack corrosion resistance, making them unsuitable for explosion-proof areas. This poses a challenge for fan cooling in certain special working environments (flammable and explosive gas and dust areas, strong acid and alkali environments, and environments with very high cleanliness requirements). The other type involves attaching a shroud to the bottom of the motor housing and connecting to external compressed air for cooling. However, compressed air cooling requires an external air compressor and air pipes to the working area of the motor, resulting in significant noise. In some special working environments, the presence of an air compressor is not permitted, rendering this method unusable. Furthermore, due to cleanliness requirements, the compressed air also needs filtration, increasing costs. Therefore, existing designs using attached flow guides indirectly dissipate heat from the internal components of the magnetic levitation motor. On the one hand, the cooling effect needs to be further improved; on the other hand, the structure of the attached flow guide cannot better meet the requirements of special working environments such as high cleanliness.
[0010] Public content
[0011] To address the aforementioned technical problems, this disclosure proposes a liquid-cooled housing, a magnetic levitation motor, and a magnetic levitation device. These components have a simple structure, are easy to implement, further improve the cooling effect of the magnetic levitation motor, and can meet the heat dissipation requirements of special working environments such as high cleanliness.
[0012] In a first aspect, embodiments of this disclosure provide a liquid-cooled housing, comprising a housing body and a base. The housing body includes an annular outer shell, a central cylinder, and a first base plate connected between the annular outer shell and the central cylinder, the annular outer shell, the central cylinder, and the first base plate forming an annular space. The base includes a second base plate and a central column formed in the middle of the second base plate. A first liquid-cooling cavity is formed inside the annular outer shell. One end of the central cylinder is an open end, and the other end of the central cylinder opposite to the open end is a closed end. The edge of the second base plate is sealed and fixedly connected to one end of the annular outer shell. The central column passes through the open end into the central cylinder, and a second liquid-cooling cavity is formed between the outer wall of the central column and the inner wall of the central cylinder. A first flow port and a second flow port are formed on the second base plate, spaced apart. The first flow port communicates with a first part of the first liquid-cooling cavity, and the second flow port communicates with a second part of the first liquid-cooling cavity. Furthermore, the first flow port communicates with a first side of the second liquid-cooling cavity, and the second flow port communicates with a second side of the second liquid-cooling cavity.
[0013] Optionally, a third liquid cooling cavity is formed between the second base plate and the first base plate, connecting the first liquid cooling cavity and the second liquid cooling cavity. A partition is formed on one side of the first base plate or one side of the second base plate, the partition dividing the third liquid cooling cavity into a first connecting part and a second connecting part. The first connecting part connects a first portion of the first liquid cooling cavity and a first side portion of the second liquid cooling cavity; the second connecting part connects a second portion of the first liquid cooling cavity and a second side portion of the second liquid cooling cavity.
[0014] Optionally, the annular outer casing has a cable outlet box on one side, and the first liquid cooling cavity extends circumferentially from one side of the cable outlet box to the opposite side; the first flow port is disposed near the cable outlet box and communicates with the first communication portion; the second flow port and the first flow port are symmetrically disposed opposite the partition portion.
[0015] Optionally, the partition is an elongated strip extending in the radial direction, and the central column is located on the partition.
[0016] Optionally, the central column is a cylinder, the central tube is a cylinder, and the width of the partition is smaller than the inner diameter of the cylinder and not smaller than the outer diameter of the column.
[0017] Optionally, the portion of the first liquid cooling cavity near the second base plate is configured as an annular cavity, and the first flow port and the second flow port are located at the connection between the annular cavity and the third liquid cooling cavity.
[0018] Optionally, the third liquid cooling cavity is formed on the second base plate or the first base plate, or a portion of the third liquid cooling cavity is formed on the second base plate and another portion of the third liquid cooling cavity is formed on the first base plate.
[0019] Optionally, a plurality of axially extending protrusions are formed on the inner wall of the annular shell, and the plurality of protrusions are arranged at intervals in the circumferential direction; an axially extending axial flow channel is formed in the protrusion, one end of the axial flow channel is connected to the first liquid cooling cavity, and the other end of the axial flow channel is connected to the third liquid cooling cavity.
[0020] Optionally, one end of the axial flow channel is connected to the first liquid cooling cavity via a radial flow channel, and the opening of the radial flow channel on the annular outer shell is sealed by a plug.
[0021] Optionally, the second base plate abuts against the first base plate, and a first flow channel and a second flow channel are formed between the second base plate and the first base plate. The first flow channel connects a first portion of the first liquid cooling cavity and a first side portion of the second liquid cooling cavity, and the second flow channel connects a second portion of the first liquid cooling cavity and a second side portion of the second liquid cooling cavity.
[0022] Optionally, the first flow channel is formed on the second base plate or on the first base plate, or a portion of the first flow channel is formed on the second base plate and another portion of the first flow channel is formed on the first base plate; the second flow channel is formed on the second base plate or on the first base plate, or a portion of the second flow channel is formed on the second base plate and another portion of the second flow channel is formed on the first base plate.
[0023] Optionally, the first flow port is provided with a first pipe connector, and the second flow port is provided with a second pipe connector.
[0024] According to another aspect of this disclosure, a magnetic levitation motor is proposed, including a magnetic levitation stator. The magnetic levitation stator includes the liquid-cooled housing and a stator assembly. The stator assembly is disposed within the annular space. The stator assembly includes a plurality of stator teeth and a plurality of winding coils. The stator teeth include longitudinal portions arranged along the axial direction and transverse portions arranged along the radial direction. The transverse portions of the plurality of stator teeth form a rotor cavity. The longitudinal portions of the plurality of stator teeth are arranged around the central cylinder. At least one winding coil is correspondingly sleeved on each of the longitudinal portions.
[0025] Secondly, this disclosure provides a magnetic levitation device, including the aforementioned magnetic levitation motor, the magnetic levitation motor further including a magnetic levitation rotor, and the magnetic levitation stator configured to drive the magnetic levitation rotor to levitate and rotate in a contactless manner.
[0026] Optionally, the magnetic levitation device is configured as a magnetic levitation pump, which further includes a pump head. The pump head includes a pump casing and a rotor impeller disposed within the pump casing. The magnetic levitation rotor is part of the rotor impeller. A liquid cooling cavity is formed inside the casing wall of the pump casing, and an inlet and an outlet communicating with the liquid cooling cavity are formed on the casing wall.
[0027] Optionally, the shell wall includes a side wall, a top wall, and a bottom wall, and the liquid cooling cavity is formed within the side wall and / or the top wall and / or the bottom wall.
[0028] Optionally, the magnetic levitation device is configured as a magnetic levitation mixer.
[0029] Compared with the prior art, the above-mentioned technical solution disclosed herein has the following advantages: The housing is designed to include a main body and a base. A first liquid cooling cavity is formed on the annular outer shell of the main body, and a central column is formed in the middle of the base. A second liquid cooling cavity is formed by the cooperation of the central column and the central cylinder of the main body. Only a sealed and fixed connection between the base and the annular outer shell of the main body is needed to provide cooling for the outer periphery and center of the magnetic levitation motor. Since the first and second liquid cooling cavities can be expanded to the maximum extent in the circumference, the magnetic levitation motor of this disclosure has a larger heat dissipation area, improving the cooling effect. Furthermore, it has better sealing performance, improving the safety of the magnetic levitation motor and preventing leakage of the liquid cooling pipes, thus better meeting the requirements of special working environments such as high cleanliness levels. In addition, the structure of this disclosure is simple and easy to assemble, effectively reducing manual assembly costs. The liquid-cooled housing used in this disclosure not only reduces the internal temperature of the magnetic levitation motor but also effectively reduces the surface temperature of the magnetic levitation motor housing, greatly reducing the risk of burns to workers and making it very friendly to personnel and the environment. Attached Figure Description
[0030] To make the content of this disclosure easier to understand, the disclosure will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...
[0031] Figure 1 is a schematic diagram of the structure of the liquid-cooled housing provided in an embodiment of this disclosure;
[0032] Figure 2 is a schematic diagram of the liquid-cooled housing provided in an embodiment of this disclosure.
[0033] Figure 3 is a structural schematic diagram of an embodiment of the liquid-cooled housing provided in this disclosure.
[0034] Figure 4 is a schematic diagram of the cross-sectional structure along direction AA in Figure 3;
[0035] Figure 5 is a schematic diagram of the cross-sectional structure along the BB direction in Figure 3;
[0036] Figure 6 is a schematic diagram of the cross-sectional structure along the CC direction in Figure 3;
[0037] Figure 7 is a schematic diagram of the structure of the base provided in an embodiment of this disclosure;
[0038] Figure 8 is a second structural schematic diagram of the base provided in an embodiment of this disclosure;
[0039] Figure 9 is a structural schematic diagram of the base provided in an embodiment of this disclosure;
[0040] Figure 10 is a schematic diagram of the structure of the magnetic levitation motor provided in an embodiment of this disclosure;
[0041] Figure 11 is a schematic diagram of the cross-sectional structure along the DD direction in Figure 10;
[0042] Figure 12 is a schematic diagram of the cross-sectional structure along the EE direction in Figure 10;
[0043] Figure 13 is a schematic diagram of the structure of the magnetic levitation pump provided in an embodiment of this disclosure;
[0044] Figure 14 is a schematic diagram of the structure of the magnetic levitation pump provided in an embodiment of this disclosure;
[0045] Figure 15 is a schematic diagram of the pump head structure of the magnetic levitation pump provided in an embodiment of this disclosure;
[0046] Figure 16 is a second schematic diagram of the pump head structure of the magnetic levitation pump provided in this embodiment of the present disclosure;
[0047] Figure 17 is a schematic diagram of the cross-sectional structure along the FF direction in Figure 16;
[0048] Figure 18 is a schematic diagram of the pump head (with the pressure plate removed) of the magnetic levitation pump provided in this embodiment of the present disclosure. Detailed Implementation
[0049] The present disclosure will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present disclosure. However, the embodiments described are not intended to limit the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without inventive effort should fall within the scope of protection of the present disclosure.
[0050] In the description of this disclosure, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. The terms "comprising" and "equipped with," and any variations thereof, in the specification, claims, and the aforementioned drawings of this disclosure are intended to cover non-exclusive inclusion. For example, a system, product, or device that includes a series of units is not necessarily limited to those units explicitly listed, but may include other units not explicitly listed or inherent to such products or devices.
[0051] Figure 1 is a schematic diagram of the structure of the liquid-cooled housing provided in an embodiment of the present disclosure; Figure 2 is a schematic diagram of the structure of the liquid-cooled housing provided in an embodiment of the present disclosure; Figure 3 is a schematic diagram of the structure of the liquid-cooled housing provided in an embodiment of the present disclosure; Figure 4 is a cross-sectional view of the structure along the AA direction in Figure 3; Figure 5 is a cross-sectional view of the structure along the BB direction in Figure 3; Figure 6 is a cross-sectional view of the structure along the CC direction in Figure 3; Figure 7 is a schematic diagram of the structure of the base provided in an embodiment of the present disclosure.
[0052] Referring to Figures 1-7, this disclosure proposes a liquid-cooled housing, applicable to magnetic levitation motors or other motors requiring high-efficiency cooling. The liquid-cooled housing 1 includes a housing body 11 and a base 12. The housing body 11 includes an annular outer shell 111, a central cylinder 112, and a first base plate 113 connecting the annular outer shell 111 and the central cylinder 112. The annular outer shell 111, the central cylinder 112, and the first base plate 113 form an annular space 114. The base 12 includes a second base plate 121 and a central column 122 formed in the middle of the second base plate 121. A first liquid-cooling cavity 1111 is formed inside the annular outer shell 111. One end of the central cylinder 112 is an open end 1121, and the other end of the central cylinder 112 opposite to the open end 1121 is... The closed end 1122; the edge of the second base plate 121 is sealed and fixedly connected to one end of the annular outer shell 111. The central column 122 passes through the open end 1121 and is inserted into the central cylinder 112. A second liquid cooling cavity 1123 is formed between the outer wall of the central column 122 and the inner wall of the central cylinder. The second base plate 121 has a first flow port 123 and a second flow port 124 that are spaced apart. The first flow port 123 connects to the first part 11111 of the first liquid cooling cavity 1111, and the second flow port 124 connects to the second part 11112 of the first liquid cooling cavity 1111. The first flow port 123 connects to the first side 11231 of the second liquid cooling cavity 1123, and the second flow port 124 connects to the second side 11232 of the second liquid cooling cavity 1123. The coolant flows through the first liquid cooling cavity 1111 in the annular outer shell 111, which can directly remove most of the heat generated by the motor stator core and windings. This is the most direct cooling for the core heat-generating area of the motor. The coolant simultaneously flows through the second liquid-cooled cavity 1123 between the central cylinder 112 and the central column 122. This effectively cools the central part of the motor, solving the problem of heat dissipation difficulties in the central part, which is highly beneficial in preventing overheating and alarm-induced work interruptions. Furthermore, this liquid-cooled housing 1 not only reduces the internal temperature of the magnetic levitation motor but also effectively reduces the surface temperature of the magnetic levitation motor housing, greatly reducing the risk of burns to workers and making it very friendly to personnel and the environment.
[0053] With the above structure, the housing is designed to include a main body 11 and a base 12. A first liquid cooling cavity 1111 is formed on the annular outer shell of the main body 11, and a central column 122 is formed in the middle of the base 12. A second liquid cooling cavity 1123 is formed by the cooperation of the central column 122 and the central cylinder 112 of the main body 11. Cooling is achieved on the outer periphery and central part of the magnetic levitation motor simply by sealing and fixing the base 12 to the annular outer shell 111 of the main body 11. Since the first liquid cooling cavity 1111 and the second liquid cooling cavity 1123 can be expanded to the maximum extent in the circumference, the magnetic levitation motor of this disclosure has a larger heat dissipation area, improving the cooling effect; it also has better sealing performance, improving the safety of the magnetic levitation motor and preventing leakage of the liquid cooling pipeline, thus better meeting the requirements of special working environments such as high cleanliness. In addition, the structure of this disclosure is simple and easy to assemble, effectively reducing manual assembly costs.
[0054] Optionally, referring to Figures 4-7, a third liquid cooling cavity 125 is formed between the second base plate 121 and the first base plate 113, connecting the first liquid cooling cavity 1111 and the second liquid cooling cavity 1123. A partition portion 126 is formed on one side of the second base plate 121, which divides the third liquid cooling cavity 125 into a first connecting portion 1251 and a second connecting portion 1252. The first connecting portion 1251 connects the first part 11111 of the first liquid cooling cavity 1111 and the first side portion 11231 of the second liquid cooling cavity 1123; the second connecting portion 1252 connects the second part 11112 of the first liquid cooling cavity 1111 and the second side portion 11232 of the second liquid cooling cavity 1123. Thus, by forming a third liquid cooling cavity 125 on the side of the second base plate 121 facing the first base plate 113, and dividing the third liquid cooling cavity 125 into two parts, namely the first connecting part 1251 and the second connecting part 1252, communication between the first liquid cooling cavity 1111 and the second liquid cooling cavity 1123 can be achieved. Cooling medium, such as cooling water, enters the first liquid cooling cavity 1111 through the second flow port 124 to cool the annular outer shell 111, and simultaneously enters one side of the second liquid cooling cavity 1123 through the second connecting part 1252, and then returns to the first flow port 123 from the other side of the second liquid cooling cavity 1123 through the first connecting part 1251 to cool the central cylinder 112. The dividing part 126 is configured to divide the third liquid cooling cavity 125 into two parts, allowing the cooling medium to enter from one side of the central cylinder 112 and flow out from the other side, thereby achieving circulation of the cooling medium. The dividing part 126 is, for example, a dividing plate or other strip-shaped or block-shaped structure with a dividing function. In this embodiment, the partition 126 is formed on the second base plate 121 of the base 12, but it is not limited thereto. In other embodiments, the partition 126 may also be formed on the side of the first base plate 113 facing the second base plate 121.
[0055] Optionally, referring to Figures 1, 2, 3, and 4, in this embodiment of the present disclosure, the annular housing 111 has a terminal box 13 on one side, and a first liquid cooling cavity 1111 extends circumferentially from one side of the terminal box 13 to the opposite side; a first flow port 123 is disposed near the terminal box 13 and communicates with the first connecting portion 1251; a second flow port 124 is symmetrically arranged with a separation portion 126 opposite to the first flow port 123. The terminal box is configured to lead the winding coils of the magnetic levitation stator of the magnetic levitation motor to a power supply device outside the motor, such as the power amplifier circuit of the controller. In applications of magnetic levitation motors, the terminal box is usually disposed on one side of the housing, and sensor conditioning circuit boards, etc., can also be disposed in the terminal box. Therefore, optionally, to avoid the terminal box, the first liquid cooling cavity 1111 extends circumferentially from one side of the terminal box 13 to the opposite side. Thus, the first liquid cooling cavity 1111 is approximately C-shaped in the annular housing 111, as shown in Figure 12, to extend to as much area as possible within the annular housing. In the operating state of the magnetic levitation motor, the outlet box 13 is typically located at the top of the housing. The first flow port 123 is positioned close to the outlet box 13 and connected to the first connecting portion 1251. The second flow port 124 is symmetrically positioned relative to the first flow port 123 via the separating portion 126. Thus, one flow port is located near the top of the magnetic levitation motor, and the other is located at the bottom. For example, the bottom flow port is configured for cooling medium inflow, and the top flow port is configured for cooling medium outflow, with the cooling medium circulating under fluid pressure. In other embodiments, the second flow port 124 and the first flow port 123 can also be located at other positions on the magnetic levitation motor, such as the left and right sides. In this case, the relative positions of the separating portion 126 and the two flow ports remain unchanged.
[0056] Optionally, referring to Figure 7, the partition 126 is an elongated strip extending radially, with the central pillar 122 located on the partition 126. Thus, the partition 126 is plate-shaped, dividing the third liquid cooling cavity 125 into two parts. Since the central pillar 122 is located in the middle of the second base plate 121, it can optionally be positioned on the partition 126, resulting in a symmetrical overall structure. In other embodiments, the partition 126 can also be of a regular or irregular shape. Similarly, the shape of the central pillar 122 is not limited. Optionally, referring to Figures 6 and 7, the central pillar 122 is cylindrical, the central cylinder is cylindrical, and the width of the partition 126 is smaller than the inner diameter of the cylinder and not smaller than the outer diameter of the cylinder. The width of the partition 126 is smaller than the inner diameter of the cylinder to prevent the partition from obstructing the cooling medium from entering the central cylinder. The width of the partition 126 is greater than or equal to the outer diameter of the cylinder to provide better support for the central pillar 122. Of course, the central column 122 can also be set at other positions on the second base plate 121, and not on the partition 126, as long as the central column 122 corresponds to the central cylinder 112 of the main body 11 of the housing. The setting position of the central column 122 is not limited here.
[0057] Optionally, referring to Figure 4, the portion of the first liquid cooling cavity 1111 near the second base plate 121 is configured as an annular cavity 11113, with the first flow port 123 and the second flow port 124 located at the connection between the annular cavity 11113 and the third liquid cooling cavity 125. Since the axial dimension of the cable outlet box 13 is typically smaller than the dimension of the annular outer shell 111, forming an annular cavity 11113 near the third liquid cooling cavity 126 in the first liquid cooling cavity 1111 can better expand the cooling area of the annular outer shell, thereby further improving the cooling effect. Of course, the portion of the first liquid cooling cavity 111 near the second base plate 121 can also be configured as a rectangular cavity or other shaped cavity, depending on the shape of the main body 11 of the casing; this is not limited here.
[0058] Optionally, referring to Figures 4 and 7, the third liquid cooling cavity 125 is formed on the second base plate 121. In other embodiments, the third liquid cooling cavity 125 may also be formed on the first base plate 113. Alternatively, a portion of the third liquid cooling cavity 125 may be formed on the second base plate 121, and another portion of the third liquid cooling cavity 125 may be formed on the first base plate 113.
[0059] Optionally, referring to Figures 2, 3, 4, 5, and 6, to better achieve internal cooling of the magnetic levitation motor, the inner wall of the annular outer shell 111 may have multiple axially extending protrusions 1112, which are arranged circumferentially at intervals. An axially extending axial flow channel 1113 is formed within each protrusion 1112, with one end of the axial flow channel 1113 communicating with the first liquid cooling cavity 1111 and the other end communicating with the third liquid cooling cavity 125. Thus, the protrusions on the inner wall of the annular outer shell 111 exhibit an inwardly protruding characteristic. For example, the protrusions 1112 can be located within the gap between two adjacent winding coils of the magnetic levitation stator. Since the axial flow channel 1113 is formed within the protrusions 1112, direct cooling near the heat source (heat generated by the winding coils) can be achieved, further improving the cooling effect of the magnetic levitation motor. Furthermore, the protrusion is integrally molded with the outer shell, resulting in good heat conduction, reducing the risk of leakage, and its simple structure facilitates assembly, thus lowering labor assembly costs.
[0060] Optionally, referring to Figures 2, 3, 4, 5, and 6, one end of the axial flow channel 1113 is connected to the first liquid cooling cavity 1111 via a radial flow channel 1114. The opening of the radial flow channel 1114 on the annular outer shell 111 is sealed by a plug 14. In this way, only an opening in the annular outer shell 111 is needed to achieve communication between the axial flow channel 1113 and the first liquid cooling cavity 1111. This is simple to manufacture and the opening area is small, allowing for sealing with a plug, thus ensuring a low risk of leakage for the entire motor. One end of the axial flow channel 1113 is connected to the first liquid cooling cavity 1111, and the other end is connected to the third liquid cooling cavity 125. The cooling medium can flow within the axial flow channel 1113 under fluid pressure, achieving direct cooling closer to the heat source and further improving the cooling effect of the magnetic levitation motor. Of course, the axial flow channel 1113 can also be formed by other methods, which are not limited here.
[0061] In the above embodiments, the communication between the first liquid cooling cavity 1111 and the second liquid cooling cavity 1123 is achieved by forming a third liquid cooling cavity 125 on the second base plate 121. However, this is not a limitation. Optionally, referring to FIG9, the second base plate 121 may abut against the first base plate 113. A first flow channel 1253 and a second flow channel 1254 are formed between the second base plate 121 and the first base plate 113. The first flow channel 1253 connects the first portion 11111 of the first liquid cooling cavity 1111 and the first side portion 11231 of the second liquid cooling cavity 1123. The second flow channel 1254 connects the second portion 11112 of the first liquid cooling cavity 1111 and the second side portion 11232 of the second liquid cooling cavity 1123. In this way, by forming the first flow channel 1253 and the second flow channel 1254 between the second base plate 121 and the first base plate 113, the communication between the first liquid cooling cavity 1111 and the second liquid cooling cavity 1123 can be achieved. The cooling medium enters the first liquid cooling chamber 1111 through the first flow port 123 to cool the annular outer shell 111. At the same time, it can enter one side of the second liquid cooling chamber 1123 through the first flow channel 1253, and then return to the second flow port 124 through the second flow channel 1254 from the other side of the second liquid cooling chamber 1123 to cool the central cylinder 112.
[0062] Optionally, the first flow channel 1253 is formed on the second base plate 121 or the first base plate 113, or a portion of the first flow channel 1253 is formed on the second base plate 121 and another portion of the first flow channel 1253 is formed on the first base plate 113; the second flow channel 1254 is formed on the second base plate 121 or the first base plate 113, or a portion of the second flow channel 1254 is formed on the second base plate 121 and another portion of the second flow channel 1254 is formed on the first base plate 113.
[0063] Optionally, referring to Figures 1 and 4, a first pipe connector 15 is provided in the first flow port 123, and a second pipe connector 16 is provided in the second flow port 124. This allows for convenient connection to an external circulating cooling device via the first and second pipe connectors.
[0064] Based on the same inventive concept, referring to Figures 10, 11, 12, and 14, this disclosure proposes a magnetic levitation motor, including a magnetic levitation stator 100 and a magnetic levitation rotor 200. The magnetic levitation stator 100 includes a housing 1 and a stator assembly 2. The housing 1 includes a housing body 11 and a base 12. The housing body 11 includes an annular outer shell 111, a central cylinder 112, and a first base plate 113 connecting the annular outer shell 111 and the central cylinder 112. The stator assembly 2 is disposed on the central cylinder 112. Within the annular space 114 formed by the annular outer shell 111 and the first base plate 113, the stator assembly 2 includes a plurality of stator teeth 21 and a plurality of winding coils 22. The stator teeth 21 include a longitudinal portion 211 arranged along the axial direction and a transverse portion 212 arranged along the radial direction. The transverse portions of the plurality of stator teeth 21 form a rotor cavity, and the longitudinal portions of the plurality of stator teeth 21 are arranged around the central cylinder. At least one winding coil 22 is correspondingly sleeved on each longitudinal portion, and an axially extending gap 23 is formed between two adjacent winding coils 22.
[0065] The magnetic levitation motor includes a magnetic levitation stator 100 and a magnetic levitation rotor 200. The magnetic levitation stator 100 is configured to drive the magnetic levitation rotor 200 to levitate and rotate in a contactless manner. Optionally, referring to Figure 11, the magnetic levitation stator 100 drives the magnetic levitation rotor to rotate and levitate in an internal rotor manner based on the principle of a bearingless thin-plate motor. In this way, based on the principle of a bearingless thin-plate motor, the magnetic levitation rotor is driven by the levitation and rotating magnetic field of the magnetic levitation stator to achieve stable rotation and levitation. Specifically, the magnetic levitation rotor can be, for example, a permanent magnet rotor, a short-circuit cage rotor, or a reluctance rotor. Optionally, the magnetic levitation rotor is a permanent magnet rotor. For example, the magnetic levitation rotor is a permanent magnet rotor and includes a magnetic pole pair, which includes two magnetic poles with opposite polarities (N pole and S pole). The two magnetic poles are arranged radially and generate a magnetic field distributed according to a cosine distribution. The technical principle of this is existing technology and will not be described in detail here. For more technical details, please refer to patent documents CN116191701A, CN116961510A, etc.
[0066] Bearingless thin-plate motors are a special type of bearingless motor. They inherit the advantages of bearingless motors, and the rotor has a very small ratio of axial length to diameter, forming a thin plate shape. This eliminates the need for axial magnetic bearings. By utilizing bearingless technology, the rotor achieves active rotation and radial levitation. The magnetic circuit formed by the mechanical structure achieves passive levitation of the other three degrees of freedom besides radial and rotational degrees of freedom. It features high cleanliness, no precipitation, no particles, no dynamic seals, and superior performance, and has good application prospects in ultra-clean drive fields such as biochemistry, medicine, and semiconductor manufacturing.
[0067] Bearingless sheet metal motors can be classified into single-winding and double-winding structures depending on their winding structure. This disclosure does not limit the winding structure of the bearingless sheet metal motor; it can be either a single-winding or double-winding structure. Optionally, referring to Figures 11, 12, and 14, the stator assembly 2 of the magnetically levitated stator 100 includes multiple stator teeth 21 and multiple winding coils 22. The stator teeth 21 are L-shaped. The stator assembly 2 also includes a magnetic ring. The longitudinal portions 211 of the multiple stator teeth 21 are magnetically connected to the magnetic ring. The winding coils 22 are sleeved on the longitudinal portions 211 of the stator teeth 21. The transverse portions 212 of the multiple stator teeth 21 form a rotor cavity. The longitudinal portions of the multiple stator teeth 21 are arranged around the central cylinder 112, and at least one winding coil 22 is correspondingly sleeved on each longitudinal portion. In one embodiment, two winding coils 22 are provided on each stator tooth 21. Both winding coils 22 can be concentrated windings, or one winding coil can be concentrated and the other distributed winding. The two winding coils 22 on the stator tooth 21 are wound together, with one winding coil configured for rotation control and the other for levitation control, thus forming a dual-winding structure for the magnetic levitation motor. In another embodiment, one winding coil 22 is provided on each stator tooth 21. This winding coil 22 is a concentrated winding, configured for both rotation control and levitation control, thus forming a single-winding structure for the magnetic levitation motor. Figures 10 and 14 only illustrate the winding coils; the number of winding coils is not limited.
[0068] Optionally, the outer shell 111, the central cylinder 112, and the base 113 of the housing 11 can be integrally formed, for example, by die casting into a metal housing that facilitates heat dissipation. However, this is not a limitation. In other embodiments, the outer shell 111, the base 113, and the central cylinder 112 of the housing 11 can also be composed of separate structures, with each part made of the same or different materials.
[0069] This disclosure is not limited to the flow direction and number of axial flow channels 1113 within the protrusions 1112. In one embodiment, the axial flow channels 1113 are configured to guide liquid flow in the same direction. In one embodiment, for example, five protrusions 1112 are formed on the inner wall of the annular housing 111. The number of protrusions can be configured according to the number of gaps between the multiple winding coils 22 of the magnetic levitation stator, and is not limited herein.
[0070] Optionally, based on the same inventive concept, referring to Figures 13 and 14, this disclosure also proposes a magnetic levitation device, including the magnetic levitation motor in the above embodiments. The magnetic levitation motor includes a magnetic levitation stator 100 and a magnetic levitation rotor 200, wherein the magnetic levitation stator 100 is configured to drive the magnetic levitation rotor 200 to levitate and rotate in a contactless manner.
[0071] Optionally, the magnetic levitation motor can be combined with different functional accessories to become magnetic levitation devices for different applications. For example, magnetic levitation devices include, but are not limited to, magnetic levitation pumps and magnetic levitation mixers.
[0072] Optionally, referring to Figures 13 and 14, the magnetic levitation device is configured as a magnetic levitation pump. In the application of the magnetic levitation pump, in addition to the magnetic levitation motor in the above embodiments, the magnetic levitation pump also includes a pump head 300. The pump head 300 includes a pump casing 31 and a rotor impeller 32 disposed in the pump casing. The magnetic levitation rotor 200 is both the rotor of the magnetic levitation motor and part of the rotor impeller of the pump. It can be, for example, a permanent magnet rotor, a short-circuit cage rotor, or a reluctance rotor. The magnetic levitation stator is configured to drive the rotor impeller to rotate and levitate.
[0073] Optionally, referring to Figures 14, 15, 16, 17, and 18, a liquid-cooled cavity 33 is formed within the shell wall of the pump housing 31, and an inlet 331 and an outlet 332 communicating with the liquid-cooled cavity 33 are formed on the shell wall. The shell wall includes a side wall 311, a top wall 312, and a bottom wall 313, and the liquid-cooled cavity 33 is formed within the side wall 311 and / or the top wall 312 and / or the bottom wall 313. In this way, by forming a liquid-cooled cavity 33 within the shell wall of the pump head of the magnetic levitation pump, the liquid-cooled cavity 33 can be connected to an external circulating cooling device through the inlet 331 and the outlet 332, thereby achieving direct cooling and heat dissipation of the pump head of the magnetic levitation pump. The liquid-cooled cavity 33 is integrally formed with the pump head, without increasing the space occupied by the pump head.
[0074] This disclosure does not limit the location of the liquid cooling cavity 33 within the housing wall; that is, the liquid cooling cavity 33 can be formed in at least one of the side wall 311, top wall 312, and bottom wall 313. For example, depending on the material of the pump head housing wall, a more advantageous location for the liquid cooling cavity 33 can be selected. For instance, when the pump head is made of a highly corrosion-resistant material such as polytetrafluoroethylene (PTFE), since PTFE has a long thermal conductivity, the liquid cooling cavity 33 can be located closer to the inner wall of the housing wall. For example, the liquid cooling cavity 33 can be located adjacent to the bottom wall and side wall to better approximate the volute of the pump head. Furthermore, when the pump head is made of a material with good thermal conductivity such as stainless steel, the liquid cooling cavity 33 can be located in the middle of the housing wall.
[0075] Optionally, referring to Figures 15 and 17, the side wall 311 and the bottom wall 313 are integrally formed into a lower shell, and the lower shell is sealed and fixedly connected to the top wall 312. The top wall 312 is also called a top plate or upper shell. The top wall 312 typically includes a plate body and a protrusion extending towards the volute, i.e., a step is formed at the junction of the protrusion and the plate body. The side wall 311 of the lower shell is flush with the outer edge of the plate body, and the outer surface of the protrusion of the top wall 312 contacts the inner surface of the side wall 311 of the lower shell. Referring to Figure 17, optionally, a first groove 34 is formed on the inner side of the end of the side wall 311 of the lower shell facing the top wall 312, and a first sealing ring 35 is provided in the first groove 34. Thus, when the top wall 312 and the side wall 311 of the lower shell are fastened together with fasteners, the first sealing ring can achieve a sealed and fixed connection between the top wall 312 and the lower shell. In other embodiments, the side wall 311 can also be integrally formed with the top wall 312 to form an upper shell. Based on the same principle, the upper shell and the bottom wall 313 can also be sealed and fixedly connected by setting a sealing ring and by fasteners. Of course, in addition to using a sealing ring, other methods such as sealant can also be used for sealing, which are not limited here.
[0076] Optionally, referring to Figures 16, 17, and 18, the lower housing also includes a pressure plate 314. A liquid cooling cavity 33 is formed within the side wall 311 of the lower housing, and the opening of the liquid cooling cavity 33 facing the bottom wall 313 is sealed and fixed by the pressure plate 314. In this way, the cavity (liquid cooling cavity) can be first fabricated on the housing wall of the pump head through machining or injection molding, and then the pressure plate 314 can be placed over the opening of the liquid cooling cavity 33 facing the bottom wall 313 for fixation and sealing. The sealing and fixing between the pressure plate 314 and the side wall 311 or bottom wall 313 can be achieved by fasteners, bonding, or welding. In one embodiment, referring to Figure 16, the pressure plate 314 is locked to the bottom wall 313 and side wall 311 of the housing wall by multiple fasteners. In another embodiment, when the pump head is made of stainless steel or other metal, a sealed and fixed connection can be achieved by welding. Since the pump head is made of stainless steel or other metal for welding, there is no need to set a sealing ring, so the size of the liquid cooling cavity can be designed to be larger to provide a better cooling effect.
[0077] When the pump head is made of materials such as PTFE, sealing can also be achieved by setting a sealing ring. Optionally, referring to Figure 17, a second groove 36 is provided at the opening of the liquid cooling cavity 33 facing the pressure plate 314, and a second sealing ring 37 is provided in the second groove 36. In this way, when the pressure plate 314 is fastened together with the side wall 311 and bottom wall 313 of the lower shell using fasteners, the second sealing ring can achieve a sealed and fixed connection between the pressure plate 314 and the lower shell. In other embodiments, the liquid cooling cavity 33 can also be directly formed into a flow channel surrounding the volute within the shell wall of the pump head.
[0078] Optionally, referring to Figures 15, 17, and 18, a pump head inlet pipe 3121 is formed at the center of the top wall 312 of the pump head, and a pump head outlet pipe 3111 is formed on one side of the side wall 311. An outlet step 3112 is formed in the liquid cooling cavity 33 near the pump head outlet pipe 3111. Since the pump head outlet pipe 3111 is located on the side wall 311, and the annular liquid cooling cavity 33 needs to be avoided when passing through the pump head outlet pipe, the design of the pump head outlet pipe can be maintained without affecting the maximum flow area of the liquid cooling cavity 33. The pump head inlet pipe 3121 and the pump head outlet pipe 3111 are configured to connect to external pipelines to achieve circulating pumping of the pumping system. For example, the pump head inlet pipe 3121 and the pump head outlet pipe 3111 can be tubular interfaces with threads for connecting to external pipelines, but are not limited to this; other connection methods are also possible.
[0079] Optionally, referring to Figures 16, 17, and 18, a rotor engagement portion 315 is formed at the center of the bottom wall 313 of the pump head. This allows the magnetic levitation rotor 200 to be limited by the rotor engagement portion 315 when it is located inside the pump head. Furthermore, the cooperation between the rotor engagement portion 315 and the rotor cavity of the magnetic levitation stator allows for the configuration of either an inner rotor or an outer rotor magnetic levitation motor. For example, referring to Figure 14, the magnetic levitation motor is an inner rotor, in which case the rotor body 321 of the rotor impeller 32 is housed within the space of the rotor engagement portion 315. The rotor cavity of the magnetic levitation stator is also included, with the rotor engagement portion 315 of the pump head protruding into the rotor cavity, thus forming an inner rotor type magnetic levitation motor. However, this is not the only possibility. In other embodiments, the magnetic levitation motor can also be an outer rotor. In this case, the rotor engagement portion 315 is configured as a hollow protruding column portion extending inward from the bottom wall of the pump head. The rotor body can be annular and fitted onto the protruding column portion, with the magnetic levitation stator disposed in the hollow portion of the protruding column portion, thus forming an outer rotor type magnetic levitation motor.
[0080] Optionally, the magnetic levitation device is configured as a magnetic levitation mixer. In the application of the magnetic levitation mixer, in addition to the magnetic levitation motor in the above embodiments, the magnetic levitation mixer also includes a stirring device. The stirring device includes a stirring container and a rotor stirring head disposed in the stirring container. The magnetic levitation rotor is both the rotor of the magnetic levitation motor and part of the rotor stirring head of the stirring device. The magnetic levitation stator is configured to drive the rotor stirring head to rotate and levitate.
[0081] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom remain within the scope of this disclosure. Industrial applicability
[0082] In summary, the embodiments of this disclosure provide a liquid-cooled housing, a magnetic levitation motor, and a magnetic levitation device, which have a large heat dissipation area, improving the cooling effect of the magnetic levitation motor; they also have better sealing performance, improving the safety of the magnetic levitation motor and preventing leakage in the liquid cooling pipeline. Furthermore, they can effectively control the surface temperature of the magnetic levitation motor housing, greatly reducing the risk of burns to workers, making them very friendly to personnel and the environment.
Claims
1. A liquid-cooled housing, characterized in that, The device includes a housing body and a base. The housing body includes an annular outer shell, a central cylinder, and a first base plate connecting the annular outer shell and the central cylinder. The annular outer shell, the central cylinder, and the first base plate form an annular space. The base includes a second base plate and a central column formed in the middle of the second base plate. A first liquid cooling cavity is formed inside the annular outer shell. One end of the central cylinder is an open end, and the other end of the central cylinder opposite to the open end is a closed end. The edge of the second base plate is sealed and fixedly connected to one end of the annular outer shell. The central column passes through the open end into the central cylinder. A second liquid cooling cavity is formed between the outer wall of the central column and the inner wall of the central cylinder. A first flow port and a second flow port are formed on the second base plate. The first flow port connects to a first part of the first liquid cooling cavity, and the second flow port connects to a second part of the first liquid cooling cavity. The first flow port connects to a first side of the second liquid cooling cavity, and the second flow port connects to a second side of the second liquid cooling cavity.
2. The liquid-cooled housing according to claim 1, characterized in that, A third liquid cooling cavity is formed between the second base plate and the first base plate, connecting the first liquid cooling cavity and the second liquid cooling cavity. A partition is formed on one side of the first base plate or one side of the second base plate, which divides the third liquid cooling cavity into a first connecting part and a second connecting part. The first connecting part connects a first portion of the first liquid cooling cavity and a first side portion of the second liquid cooling cavity; the second connecting part connects a second portion of the first liquid cooling cavity and a second side portion of the second liquid cooling cavity.
3. The liquid-cooled housing according to claim 2, characterized in that, The annular outer shell has a cable outlet box on one side, and the first liquid cooling cavity extends circumferentially from one side of the cable outlet box to the opposite side; the first flow port is located near the cable outlet box and connects to the first connecting portion; the second flow port and the first flow port are symmetrically arranged opposite the partition portion.
4. A liquid-cooled enclosure according to claim 2 or 3, wherein, The partition is a long strip extending in the radial direction, and the central column is located on the partition.
5. A liquid-cooled enclosure according to claim 4, wherein, The central column is a cylinder, the central tube is a cylindrical tube, and the width of the partition is smaller than the inner diameter of the cylindrical tube and not smaller than the outer diameter of the cylinder.
6. A liquid-cooled enclosure according to any one of claims 2-5, wherein, The portion of the first liquid cooling cavity near the second base plate is configured as an annular cavity, and the first flow port and the second flow port are located at the connection between the annular cavity and the third liquid cooling cavity.
7. A liquid-cooled enclosure according to any one of claims 2-6, wherein, The third liquid cooling cavity is formed on the second base plate or the first base plate, or a portion of the third liquid cooling cavity is formed on the second base plate and another portion of the third liquid cooling cavity is formed on the first base plate.
8. A liquid-cooled housing according to any one of claims 2-7, characterized in that, The inner wall of the annular shell has a plurality of axially extending protrusions, which are arranged at intervals in the circumferential direction; an axially extending axial flow channel is formed in the protrusion, one end of the axial flow channel is connected to the first liquid cooling cavity, and the other end of the axial flow channel is connected to the third liquid cooling cavity.
9. A liquid-cooled housing according to claim 8, characterized in that, One end of the axial flow channel is connected to the first liquid cooling cavity through a radial flow channel, and the opening of the radial flow channel on the annular outer shell is sealed by a plug.
10. A liquid-cooled housing according to any one of claims 1-9, characterized in that, The second base plate abuts against the first base plate, and a first flow channel and a second flow channel are formed between the second base plate and the first base plate. The first flow channel connects the first part of the first liquid cooling cavity and the first side of the second liquid cooling cavity, and the second flow channel connects the second part of the first liquid cooling cavity and the second side of the second liquid cooling cavity.
11. A liquid-cooled housing according to claim 10, characterized in that, The first flow channel is formed on the second base plate or on the first base plate, or a portion of the first flow channel is formed on the second base plate and another portion of the first flow channel is formed on the first base plate; the second flow channel is formed on the second base plate or on the first base plate, or a portion of the second flow channel is formed on the second base plate and another portion of the second flow channel is formed on the first base plate.
12. A liquid-cooled housing according to any one of claims 1-11, characterized in that, The first flow port is provided with a first pipe joint, and the second flow port is provided with a second pipe joint.
13. A magnetic levitation motor, characterized in that, The system includes a magnetically levitated stator, comprising a liquid-cooled housing and a stator assembly as described in any one of claims 1-12. The stator assembly is disposed within the annular space and includes a plurality of stator teeth and a plurality of winding coils. Each stator tooth includes a longitudinal portion arranged along the axial direction and a transverse portion arranged along the radial direction. The transverse portions of the plurality of stator teeth form a rotor cavity, and the longitudinal portions of the plurality of stator teeth are arranged around the central cylinder. At least one winding coil is correspondingly fitted onto each of the longitudinal portions.
14. A magnetic levitation device, characterized in that, The magnetic levitation motor of claim 13 further includes a magnetic levitation rotor, wherein the magnetic levitation stator is configured to drive the magnetic levitation rotor to levitate and rotate in a contactless manner.
15. The magnetic levitation device according to claim 14, characterized in that: The magnetic levitation device is configured as a magnetic levitation pump. The magnetic levitation pump includes a pump head, which includes a pump casing and a rotor impeller disposed within the pump casing. The magnetic levitation rotor is part of the rotor impeller. A liquid cooling cavity is formed inside the casing wall of the pump casing, and an inlet and an outlet communicating with the liquid cooling cavity are formed on the casing wall.
16. The magnetic levitation device according to claim 15, characterized in that: The shell wall includes a side wall, a top wall, and a bottom wall, and the liquid cooling cavity is formed within the side wall and / or the top wall and / or the bottom wall.
17. The magnetic levitation device according to claim 14, characterized in that: The magnetic levitation device is configured as a magnetic levitation mixer.