Liquid-cooled casing, magnetic suspension motor and magnetic suspension equipment

Abstract

The invention relates to a liquid-cooled casing, a magnetic suspension motor and magnetic suspension equipment, the liquid-cooled casing comprises a casing main body and a base, and the casing main body comprises an annular shell, a central cylinder and a first bottom plate which define an annular space; the base comprises a second bottom plate and a central column, a first liquid cooling cavity is formed in the annular shell, one end of the central cylinder is an open end, and the other end of the central cylinder is a closed end; the edge of the second bottom plate is fixedly connected with one end of the annular shell in a sealed mode, the center column penetrates through the center cylinder, a second liquid cooling cavity is formed between the outer wall of the center column and the inner wall of the center cylinder, and a first circulation opening and a second circulation opening which are spaced are formed in the second bottom plate. The first circulation port is communicated with one part of the first liquid cooling cavity and one part of the second liquid cooling cavity, and the second circulation port is communicated with the second part of the first liquid cooling cavity and the second part of the second liquid cooling cavity. The cooling effect of the magnetic suspension motor is improved, and the heat dissipation requirements of special working environments such as high cleanliness can be better met.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic suspension motors, in particular to a liquid-cooled casing, a magnetic suspension motor and a magnetic suspension device. Background Art

[0002] A magnetic levitation motor is a magnetic levitation rotary drive that uses magnetic field force to suspend the rotor so that there is no mechanical contact between the rotor and the stator. The magnetic levitation motor can be a magnetic bearing motor, a bearingless motor, or a bearingless thin-film motor, etc.

[0003] A magnetic bearing motor, also known as a magnetic bearing, is a motor that combines a rotary drive motor with an axial magnetic bearing or / and a radial magnetic bearing or / and an axial-diameter hybrid magnetic bearing instead of integrating them together.

[0004] A bearingless motor is a motor that integrates motor rotation and suspension functions. A bearingless motor has an additional set of windings on top of the windings that generate a rotating drive magnetic field to generate an excitation magnetic field. The interaction between the two magnetic fields breaks the balanced distribution of the original drive magnetic field, thereby generating a radial force acting on the rotor. The rotor is suspended by controlling the radial force in the motor. Compared with a magnetic bearing motor, the magnetic suspension winding of a bearingless motor is wound on the stator and does not take up additional space, which to a certain extent overcomes the shortcomings of large size and high cost of magnetic bearings. In order to achieve suspension of the motor rotor in five degrees of freedom, early bearingless motors generally require two bearingless motors and one axial magnetic bearing.

[0005] The bearingless thin-film motor is a special bearingless motor that inherits the advantages of bearingless motors. The axial length to diameter ratio of the rotor is very small and it is in the shape of a thin film, eliminating the axial magnetic bearing. The bearingless technology is used to realize the rotation of the rotor and the active suspension in the radial direction. The magnetic circuit formed by the mechanical structure is used to realize the passive suspension of the other three degrees of freedom except the radial and rotor rotation degrees of freedom. It has the characteristics of high cleanliness, no precipitation, no particles, no dynamic seal, and excellent performance. It has good application prospects in ultra-pure drive fields such as biochemistry, medical treatment, and semiconductor manufacturing.

[0006] The magnetic levitation motor can be assembled with fitting parts of different functions to become a magnetic levitation device for different application requirements. 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 inside the pump casing. The magnetic levitation rotor is both the rotor of the magnetic levitation motor and a 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 is 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 inside the mixing container. The magnetic levitation rotor is both the rotor of the magnetic levitation motor and a 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.

[0007] Currently, the magnetic levitation motors used in magnetic levitation pump or magnetic levitation mixer products mainly adopt the air-cooling heat dissipation method. Generally, it includes two categories. One category is: attaching a flow guide cover to the bottom of the magnetic levitation motor housing and configuring a cooling fan. Traditional cooling fans have mechanical wear, generate particles, have low cleanliness, and do not have corrosion resistance, and cannot work in explosion-proof areas, resulting in the problem that the fan heat dissipation of the magnetic levitation motor becomes difficult in some special working environments (flammable and explosive gas and dust areas, strong acid and strong base environments, and environments with high cleanliness requirements, etc.). The other category is: attaching a flow guide cover to the bottom of the magnetic levitation motor housing and externally connecting compressed air for heat dissipation. However, the compressed air heat dissipation method requires an external air compressor, and air pipes need to be arranged to the working area of the magnetic levitation motor, resulting in relatively high noise. If an air compressor is not allowed to exist in some special working environments, it cannot be used. And due to cleanliness requirements, the compressed air also needs to be filtered, resulting in relatively high costs. Therefore, the existing design schemes by attaching a flow guide cover are all to indirectly dissipate the heat conducted out inside the magnetic levitation motor. On the one hand, there is a problem that the cooling effect needs to be further improved. On the other hand, there is a problem that the structure of the attached flow guide cover cannot better meet the requirements of special working environments such as high cleanliness. Summary of the Invention

[0008] To solve the above technical problems, the present invention proposes a liquid-cooled housing, a magnetic levitation motor, and a magnetic levitation device, which 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.

[0009] According to one aspect of the present invention, a liquid-cooled housing is provided, which includes a housing main body and a base. The housing main body includes an annular outer shell, a central cylinder, and a first bottom plate connected between the annular outer shell and the central cylinder. The annular outer shell, the central cylinder, and the first bottom plate enclose an annular space. The base includes a second bottom plate and a central column formed in the middle of the second bottom plate. A first liquid cooling cavity is formed in 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 bottom plate is hermetically and fixedly connected to one end of the annular outer shell. The central column passes through the central cylinder through the open end, 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 bottom plate at intervals. 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. And the first flow port communicates with a first side portion of the second liquid cooling cavity, and the second flow port communicates with a second side portion of the second liquid cooling cavity.

[0010] Further, a third liquid cooling cavity communicating the first liquid cooling cavity and the second liquid cooling cavity is formed between the second bottom plate and the first bottom plate. A partition portion is formed on one side of the first bottom plate or one side of the second bottom plate. The partition portion divides the third liquid cooling cavity into a first communication portion and a second communication portion. The first communication portion communicates with the first part of the first liquid cooling cavity and the first side portion of the second liquid cooling cavity. The second communication portion communicates with the second part of the first liquid cooling cavity and the second side portion of the second liquid cooling cavity.

[0011] Further, a wire outlet box is provided on one side of the annular outer shell. The first liquid cooling cavity extends circumferentially from one side of the wire outlet box to the opposite side. The first flow port is arranged close to the wire outlet box and communicates with the first communication portion. The second flow port is symmetrically arranged with respect to the partition portion opposite to the first flow port.

[0012] Further, the partition portion is in a long strip shape extending in the radial direction, and the central column is located on the partition portion.

[0013] Further, the central column is a cylinder, the central cylinder is a cylindrical tube, and the width of the partition portion is less than the inner diameter of the cylindrical tube and not less than the outer diameter of the cylinder.

[0014] Further, the part of the first liquid cooling cavity close to the second bottom plate is configured as an annular cavity, and the first flow port and the second flow port are arranged at the position where the annular cavity is connected to the third liquid cooling cavity.

[0015] Further, the third liquid cooling cavity is formed on the second bottom plate or the first bottom plate, or a part of the third liquid cooling cavity is formed on the second bottom plate and the other part of the third liquid cooling cavity is formed on the first bottom plate.

[0016] Further, a plurality of protrusions extending axially are formed on the inner wall of the annular housing, and the plurality of protrusions are arranged at intervals in the circumferential direction; an axial flow channel extending axially is formed in the protrusion, one end of the axial flow channel communicates with the first liquid cooling cavity, and the other end of the axial flow channel communicates with the third liquid cooling cavity.

[0017] Further, one end of the axial flow channel communicates with the first liquid cooling cavity through a radial flow channel, and the opening of the radial flow channel on the annular housing is sealed by a plug.

[0018] Further, the second bottom plate abuts against the first bottom plate, and a first flow channel and a second flow channel are formed between the second bottom plate and the first bottom plate. The first flow channel communicates a first part of the first liquid cooling cavity and a first side part of the second liquid cooling cavity, and the second flow channel communicates a second part of the first liquid cooling cavity and a second side part of the second liquid cooling cavity.

[0019] Further, the first flow channel is formed on the second bottom plate or the first bottom plate, or a part of the first flow channel is formed on the second bottom plate and the other part of the first flow channel is formed on the first bottom plate; the second flow channel is formed on the second bottom plate or the first bottom plate, or a part of the second flow channel is formed on the second bottom plate and the other part of the second flow channel is formed on the first bottom plate.

[0020] Further, a first pipeline joint is arranged in the first communication port, and a second pipeline joint is arranged in the second communication port.

[0021] According to another aspect of the present invention, a magnetic levitation motor is provided, which includes a magnetic levitation stator. The magnetic levitation stator includes the liquid-cooled housing and a stator assembly. The stator assembly is arranged in the annular space. The stator assembly includes a plurality of stator teeth and a plurality of winding coils. The stator teeth include a longitudinal part arranged axially and a transverse part arranged radially. The transverse parts of the plurality of stator teeth enclose a rotor cavity, and the longitudinal parts of the plurality of stator teeth are arranged around the central cylinder. At least one winding coil is sleeved on each longitudinal part correspondingly.

[0022] According to another aspect of the present invention, a magnetic levitation device is provided, which includes the magnetic levitation motor described above. The magnetic levitation motor further includes a magnetic levitation rotor, and the magnetic levitation stator is configured to drive the magnetic levitation rotor to levitate and rotate in a non-contact manner.

[0023] Further, the magnetic levitation device is configured as a magnetic levitation pump, and the magnetic levitation pump 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 a part of the rotor impeller, a liquid cooling cavity is formed within the wall of the pump casing, and an inlet and an outlet for communicating with the liquid cooling cavity are formed on the wall.

[0024] Further, the wall of the pump casing 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.

[0025] Further, the magnetic levitation device is configured as a magnetic levitation stirrer.

[0026] The above technical solution of the present invention has the following advantages compared with the prior art: The present invention designs the casing to include a casing body and a base. By forming a first liquid cooling cavity on the annular outer casing of the casing body and forming a central column in the middle of the base, and with the cooperation of the central column and the central cylinder of the casing body to form a second liquid cooling cavity, only by hermetically and fixedly connecting the base to the annular outer casing of the casing body, the outer periphery and the central part of the magnetic levitation motor can have a cooling function. Since the first liquid cooling cavity and the second liquid cooling cavity can be maximally extended in the circumferential direction, on the one hand, the magnetic levitation motor of the present invention has a large heat dissipation area, improving the cooling effect of the magnetic levitation motor; on the other hand, it also has better sealing performance, improving the safety of the magnetic levitation motor and avoiding the occurrence of liquid cooling pipeline leakage. In addition, the structure of the present invention is simple and convenient for assembly, effectively reducing the manual assembly cost. Description of the Drawings

[0027] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention in conjunction with the drawings, where

[0028] Figure 1 is a schematic structural view of an embodiment of the liquid-cooled casing in the present invention Figure 1 ;

[0029] Figure 2 is a schematic structural view of an embodiment of the liquid-cooled casing in the present invention Figure 2 ;

[0030] Figure 3 is a schematic structural view of an embodiment of the liquid-cooled casing in the present invention Figure 3 ;

[0031] Figure 4 is Figure 3 a schematic cross-sectional structural view in the A-A direction in

[0032] Figure 5 is Figure 3 a schematic cross-sectional structural view in the B-B direction in

[0033] Figure 6 is Figure 3 The schematic cross-sectional structure diagram in the C-C direction;

[0034] Figure 7 is the schematic structure of an embodiment of the base in the present invention Figure 1 ;

[0035] Figure 8 is the schematic structure of an embodiment of the base in the present invention Figure 2 ;

[0036] Figure 9 is the schematic structure diagram of another embodiment of the base in the present invention;

[0037] Figure 10 is the schematic structure diagram of an embodiment of the magnetic levitation motor in the present invention;

[0038] Figure 11 is Figure 10 The schematic cross-sectional structure diagram in the D-D direction;

[0039] Figure 12 is Figure 10 The schematic cross-sectional structure diagram in the E-E direction;

[0040] Figure 13 is the schematic structure diagram of an embodiment of the magnetic levitation pump in the present invention;

[0041] Figure 14 is the schematic structure diagram of another embodiment of the magnetic levitation pump in the present invention;

[0042] Figure 15 is the schematic structure of an embodiment of the pump head of the magnetic levitation pump in the present invention Figure 1 ;

[0043] Figure 16 is the schematic structure of an embodiment of the pump head of the magnetic levitation pump in the present invention Figure 2 ;

[0044] Figure 17 is Figure 16 The schematic cross-sectional structure diagram in the F-F direction;

[0045] Figure 18 is the schematic structure of an embodiment of the pump head (removing the pressure plate) of the magnetic levitation pump in the present invention Figure 3 . Detailed implementation manners

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it. However, the exemplified embodiments are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. The terms "comprising" and "provided with" in the specification and claims of the present invention and any variations thereof are intended to cover non-exclusive inclusion. For example, a system, product or device comprising a series of units does not necessarily have to be limited to those units clearly listed, but may include other units not clearly listed or inherent to these products or devices.

[0048] Figure 1 is a schematic structural diagram of an embodiment of the liquid-cooled housing in the present invention Figure 1 ; Figure 2 is a schematic structural diagram of an embodiment of the liquid-cooled housing in the present invention Figure 2 ; Figure 3 is a schematic structural diagram of an embodiment of the liquid-cooled housing in the present invention Figure 3 ; Figure 4 is Figure 3 the schematic cross-sectional structural diagram in the A-A direction of Figure 5 is Figure 3 the schematic cross-sectional structural diagram in the B-B direction of Figure 6 is Figure 3 the schematic cross-sectional structural diagram in the C-C direction of Figure 7 is a schematic structural diagram of an embodiment of the base in the present invention.

[0049] See Figures 1 - 7, the present invention provides a liquid-cooled housing, which can be applied to a magnetic levitation motor or other motors that require efficient 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 bottom plate 113 connected between the annular outer shell 111 and the central cylinder 112. The annular outer shell 111, the central cylinder 112, and the first bottom plate 113 enclose an annular space 114. The base 12 includes a second bottom plate 121 and a central column 122 formed in the middle of the second bottom plate 121. A first liquid-cooling cavity 1111 is formed in 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 a closed end 1122. The edge of the second bottom plate 121 is hermetically and fixedly connected to one end of the annular outer shell 111. The central column 122 passes through the central cylinder 112 through the open end 1121. 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. An spaced-apart first flow port 123 and a second flow port 124 are formed on the second bottom plate 121. The first flow port 123 communicates with a first part 11111 of the first liquid-cooling cavity 1111, and the second flow port 124 communicates with a second part 11112 of the first liquid-cooling cavity 1111. Moreover, the first flow port 123 communicates with a first side portion 11231 of the second liquid-cooling cavity 1123, and the second flow port 124 communicates with a second side portion 11232 of the second liquid-cooling cavity 1123. In this way, the housing is designed to include a housing body and a base. By forming a first liquid-cooling cavity on the annular outer shell of the housing body and forming a central column in the middle of the base, and forming a second liquid-cooling cavity by the cooperation of the central column and the central cylinder of the housing body, only by hermetically and fixedly connecting the base to the annular outer shell of the housing body, the outer peripheral side and the central part of the magnetic levitation motor can have a cooling function. Since the first liquid-cooling cavity and the second liquid-cooling cavity can be maximally extended in the circumferential direction, on the one hand, the magnetic levitation motor of the present invention has a large heat dissipation area, improving the cooling effect of the magnetic levitation motor; on the other hand, it also has better sealing performance, improving the safety of the magnetic levitation motor and avoiding the occurrence of liquid-cooling pipeline leakage. In addition, the structure of the present invention is simple and convenient for assembly, which can effectively reduce the manual assembly cost.

[0050] According to an embodiment of the present disclosure, refer to Figures 4 - 7, a third liquid cooling cavity 125 communicating with the first liquid cooling cavity 1111 and the second liquid cooling cavity 1123 is formed between the second bottom plate 121 and the first bottom plate 113. A partition portion 126 is formed on one side of the second bottom plate 121. The partition portion 126 divides the third liquid cooling cavity 125 into a first communication portion 1251 and a second communication portion 1252. The first communication portion 1251 communicates with 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 communication portion 1252 communicates with the second part 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 third liquid cooling cavity on the side of the second bottom plate facing the first bottom plate and dividing the third liquid cooling cavity into two parts, namely the first communication portion and the second communication portion, the communication between the first liquid cooling cavity and the second liquid cooling cavity can be realized. While the cooling medium, such as cooling water, enters the first liquid cooling cavity through the second flow port 124 to cool the inside of the annular housing, it can enter one side of the second liquid cooling cavity through the second communication portion, and then return to the first flow port 123 from the other side of the second liquid cooling cavity through the first communication portion to cool the central cylinder. Among them, the partition portion is used to divide the third liquid cooling cavity into two parts, so that the cooling medium enters from one side of the central cylinder and flows out from the other side, thereby realizing the circulation of the cooling medium. The partition portion is, for example, a partition plate or other strip-shaped or block-shaped structures with a partitioning function. In this embodiment, the partition portion is formed on the second bottom plate of the base, but it is not limited thereto. In other embodiments, the partition portion can also be formed on the side of the first bottom plate facing the second bottom plate.

[0051] According to an embodiment of the present disclosure, referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , a wire outlet box 13 is provided on one side of the annular housing 111. The first liquid cooling cavity 1111 extends circumferentially from one side of the wire outlet box 13 to the opposite side; the first flow port 123 is arranged close to the wire outlet box 13 and communicates with the first communication portion 1251; the second flow port 124 is symmetrically arranged with respect to the partition portion 126 opposite to the first flow port 123. Among them, the wire outlet box is used to lead out the winding coils of the magnetic suspension stator of the magnetic suspension motor to a power supply device outside the motor, such as a power amplification circuit of a controller. In the application of the magnetic suspension motor, the wire outlet box is usually arranged on one side of the machine shell, and a sensor conditioning circuit board and the like can also be arranged in the wire outlet box. Therefore, in order to avoid the wire outlet box, the first liquid cooling cavity is preferably designed to extend circumferentially from one side of the wire outlet box 13 to the opposite side. In this way, the first liquid cooling cavity is generally C-shaped in the annular housing, referring to Figure 12, so as to extend to most areas of the annular housing as much as possible. The wire outlet box is usually located at the top of the housing in the working state of the magnetic levitation motor. The first flow port 123 is arranged close to the wire outlet box 13 and communicated with the first communication part 1251; the second flow port 124 is symmetrically arranged relative to the partition part 126 with respect to the first flow port 123. In this way, one flow port is close to the top position of the magnetic levitation motor, and the other flow port is located at the bottom position of the magnetic levitation motor. For example, the flow port located at the bottom is used for the cooling medium to flow in, and the flow port located at the top is used for the cooling medium to flow out. The cooling medium realizes a cooling cycle under the action of fluid pressure. In other embodiments, the second flow port and the first flow port can also be arranged at other positions of the magnetic levitation motor, such as the left and right sides. In this case, the relative positions of the partition part and the two flow ports still remain unchanged.

[0052] According to an embodiment of the present disclosure, refer to Figure 7 , the partition part 126 is in the shape of a long strip extending in the radial direction, and the central column 122 is located on the partition part 126. In this way, the partition part is in a sheet shape, dividing the third liquid cooling cavity into two parts. Since the central column is in the middle of the second bottom plate, preferably, the central column is arranged on the partition part, and the overall structure is symmetric. In other embodiments, the partition part can also be in a regular or irregular shape. Similarly, the shape of the central column is not limited. Preferably, refer to Figure 6 and Figure 7 , the central column 122 is a cylinder, the central cylinder is a cylindrical barrel, and the width of the partition part 126 is less than the inner diameter of the cylindrical barrel and not less than the outer diameter of the cylinder. Among them, the width of the partition part is less than the inner diameter of the cylindrical barrel so that the partition part does not block the cooling medium from entering the central cylinder. The width of the partition part is greater than or equal to the outer diameter of the cylinder so that the central column has better support.

[0053] According to an embodiment of the present disclosure, refer to Figure 4 , the part of the first liquid cooling cavity 1111 close to the second bottom plate 121 is configured as an annular cavity 11113, and the first flow port 123 and the second flow port 124 are arranged at the position where the annular cavity 11113 is connected to the third liquid cooling cavity 125. Since the axial dimension of the wire outlet box is usually smaller than the dimension of the annular housing, the first liquid cooling cavity 1111 forms an annular cavity 11113 at the position close to the third liquid cooling cavity, which can better expand the cooling area of the annular housing to further improve the cooling effect.

[0054] According to an embodiment of the present disclosure, refer to Figure 4 and Figure 7 , the third liquid cooling cavity 125 is formed on the second bottom plate 121. In other embodiments, the third liquid cooling cavity can also be formed on the first bottom plate. Or a part of the third liquid cooling cavity is formed on the second bottom plate, and another part of the third liquid cooling cavity is formed on the first bottom plate.

[0055] According to an embodiment of the present disclosure, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , in order to better achieve the cooling inside the magnetic levitation motor, preferably, a plurality of protrusions 1112 extending axially are formed on the inner wall of the annular housing 111, and the plurality of protrusions 1112 are arranged at intervals in the circumferential direction; an axially extending axial flow channel 1113 is formed in the protrusion 1112, one end of the axial flow channel 1113 communicates with the first liquid cooling cavity 1111, and the other end of the axial flow channel 1113 communicates with the third liquid cooling cavity 125. In this way, the protrusions are formed on the inner wall of the annular housing and protrude inward. For example, the protrusions can be arranged in the gap between two adjacent winding coils of the magnetic levitation stator. Since the axial flow channel is formed in the protrusion, the function of directly cooling near the heat source (heating of the winding coil) can be realized, further improving the cooling effect of the magnetic levitation motor. And the protrusions are integrally formed with the housing, with good heat conduction effect, not easy to leak, simple structure, convenient for assembly, and reducing the manual assembly cost.

[0056] According to an embodiment of the present disclosure, refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , one end of the axial flow channel 1113 communicates with the first liquid cooling cavity 1111 through a radial flow channel 1114, and the opening of the radial flow channel 1114 on the annular housing 111 is sealed by a plug 14. In this way, only by opening a hole in the annular housing can the communication between the axial flow channel and the first liquid cooling cavity be realized. The processing and manufacturing are simple and the opening area is small, and it can be sealed by a plug, thus ensuring a low leakage risk for the entire motor. One end of the axial flow channel communicates with the first liquid cooling cavity, and the other end communicates with the third liquid cooling cavity. The cooling medium can flow in the axial flow channel under the action of fluid pressure, so as to realize direct cooling at a position closer to the heat source, further improving the cooling effect of the magnetic levitation motor.

[0057] In the above embodiments, the communication between the first liquid cooling cavity and the second liquid cooling cavity is realized by forming the third liquid cooling cavity on the second bottom plate, but not limited thereto. According to an embodiment of the present disclosure, refer to Figure 9, the second bottom plate 121 can be in contact with the first bottom plate 113. A first flow channel 1253 and a second flow channel 1254 are formed between the second bottom plate 121 and the first bottom plate 113. The first flow channel 1253 communicates with a first part 11111 of the first liquid cooling cavity 1111 and a first side portion 11231 of the second liquid cooling cavity 1123, and the second flow channel 1254 communicates with a second part 11112 of the first liquid cooling cavity 1111 and a second side portion 11232 of the second liquid cooling cavity 1123. In this way, by forming the first flow channel and the second flow channel between the second bottom plate and the first bottom plate, the communication between the first liquid cooling cavity and the second liquid cooling cavity can be realized. While the cooling medium enters the first liquid cooling cavity through the first communication port 123 to cool the inside of the annular housing, it can enter one side of the second liquid cooling cavity through the first flow channel, and then return to the second communication port 124 from the other side of the second liquid cooling cavity through the second flow channel to cool the central cylinder.

[0058] According to an embodiment of the present disclosure, the first flow channel is formed on the second bottom plate or the first bottom plate, or a part of the first flow channel is formed on the second bottom plate and another part of the first flow channel is formed on the first bottom plate; the second flow channel is formed on the second bottom plate or the first bottom plate, or a part of the second flow channel is formed on the second bottom plate and another part of the second flow channel is formed on the first bottom plate.

[0059] According to an embodiment of the present disclosure, referring to Figure 1 and Figure 4 , a first pipeline joint 15 is provided in the first communication port, and a second pipeline joint 16 is provided in the second communication port. In this way, the external circulating cooling device can be conveniently connected through the first pipeline joint and the second pipeline joint.

[0060] Based on the same inventive concept, referring to Figure 10 , Figure 11 , Figure 12 and Figure 14 , the present invention provides a magnetic levitation motor, which includes 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 main body 11 and a base 12. The housing main body 11 includes an annular housing 111, a central cylinder 112, and a first bottom plate 113 connected between the annular housing 111 and the central cylinder 112. The stator assembly 2 is disposed in an annular space 114 surrounded by the central cylinder 112, the annular housing 111, and the first bottom 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 enclose 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 sleeved on each longitudinal portion, and a gap 23 extending along the axial direction is formed between adjacent two winding coils 22.

[0061] The magnetic suspension motor includes a magnetic suspension stator 100 and a magnetic suspension rotor 200, and the magnetic suspension stator 100 is configured to drive the magnetic suspension rotor 200 to suspend and rotate in a contactless manner. Figure 11 , the magnetic levitation stator 100 drives the magnetic levitation rotor to rotate and suspend in the form of an inner rotor based on the principle of a bearingless thin-film motor. In this way, based on the principle of a bearingless thin-film motor, the magnetic levitation rotor is driven by the suspension and rotating magnetic field of the magnetic levitation stator to rotate and suspend stably. Specifically, the magnetic levitation rotor can be, for example, a permanent magnet rotor or a short-circuit cage rotor or a reluctance rotor. Preferably, the magnetic levitation rotor is a permanent magnet rotor. For example, the magnetic levitation rotor is a permanent magnet rotor and includes a pole pair, which includes two poles with opposite polarities (N pole and S pole), and the two poles are arranged radially and generate a magnetic field according to a cosine distribution. The technical principle is already a prior art and will not be repeated here. For more technical content, please refer to patent documents CN116191701A, CN116961510A, etc.

[0062] The bearingless thin-film motor is a special bearingless motor. It inherits the advantages of the bearingless motor, and the axial length to diameter ratio of the rotor is very small, in the shape of a thin film, eliminating the axial magnetic bearing. The bearingless technology is used to realize the rotation of the rotor and the active suspension in the radial direction. The magnetic circuit composed of the mechanical structure is used to realize the passive suspension of the other three degrees of freedom except the radial and rotor rotation degrees of freedom. It has the characteristics of high cleanliness, no precipitation, no particles, no dynamic seal, and excellent performance. It has good application prospects in ultra-pure drive fields such as biochemistry, medical treatment, and semiconductor manufacturing.

[0063] The bearingless thin-film motor can be divided into a single winding structure and a double winding structure according to the different winding structures. The present invention does not limit the winding structure of the bearingless thin-film motor, which can be a single winding structure or a double winding structure. According to the embodiments of the present disclosure, see Figure 11 , Figure 12 and Figure 14, the stator assembly 2 of the magnetic levitation stator 100 includes a plurality of stator teeth 21 and a plurality of winding coils 22. The stator teeth 21 are L-shaped. The stator assembly 2 further includes a magnetic conductive ring. The longitudinal portions 211 of the plurality of stator teeth 21 are magnetically connected to the magnetic conductive ring. The winding coils 22 are sleeved on the longitudinal portions 211 of the stator teeth 21. The transverse portions 212 of the plurality of stator teeth 21 enclose a rotor cavity. The longitudinal portions of the plurality of stator teeth are arranged around the central cylinder, and at least one winding coil is correspondingly sleeved on each longitudinal portion. In one embodiment, two winding coils are arranged on each stator tooth. The two winding coils can both be concentrated windings, or one winding coil can be a concentrated winding and the other winding coil can be a distributed winding. The two winding coils on the stator tooth are wound together. One winding coil is used for rotation control, and the other winding coil is used for levitation control to form a dual-winding structure of the magnetic levitation motor. In another embodiment, one winding coil is arranged on each stator tooth. The winding coil is a concentrated winding. The winding coil is used for both rotation control and levitation control to form a single-winding structure of the magnetic levitation motor. Among them, Figure 10 and Figure 14 only the winding coils are schematically shown, and the number of winding coils is not limited.

[0064] According to an embodiment of the present disclosure, the outer shell 111, the central cylinder 112, and the base 113 of the machine shell 11 can be integrally formed, for example, integrally formed by die casting into a metal shell for easy heat dissipation. However, it is not limited thereto. In other embodiments, the outer shell 111, the base 113, and the central cylinder 112 of the machine shell 11 can also be composed of a split structure, and the materials of each part are the same or different.

[0065] The present invention is not limited to the flow direction and number of the axial flow channels in the protrusion. In one embodiment, the axial flow channels are configured to guide the liquid flow in the same direction. In one embodiment, for example, 5 protrusions are formed on the inner wall of the annular outer shell. The number of protrusions can be configured according to the number of gaps between the plurality of winding coils of the magnetic levitation stator.

[0066] According to an embodiment of the present disclosure, based on the same inventive concept, see Figure 13 and Figure 14 , the present invention also provides 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. The magnetic levitation stator 100 is configured to drive the magnetic levitation rotor 200 to levitate and rotate in a non-contact manner.

[0067] According to an embodiment of the present disclosure, the magnetic levitation motor can be assembled with fittings with different functions to become a magnetic levitation device for different application requirements. For example, the magnetic levitation device includes, but is not limited to, a magnetic levitation pump and a magnetic levitation mixer.

[0068] In one embodiment, seeFigure 13 and Figure 14 In the application of the magnetic levitation pump, which is a magnetic levitation device configured as a magnetic levitation pump, in addition to the magnetic levitation motor in the above embodiments, the magnetic levitation pump further includes a pump head 300. The pump head 300 includes a pump casing 31 and a rotor impeller 32 disposed within the pump casing. The magnetic levitation rotor 200 is both the rotor of the magnetic levitation motor and a part of the rotor impeller of the pump, and 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.

[0069] According to an embodiment of the present disclosure, referring to Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 18 a liquid cooling cavity 33 is formed within the wall of the pump casing 31, and a liquid inlet 331 and a liquid outlet 332 communicating with the liquid cooling cavity 33 are formed on the wall. The wall of the pump casing includes a side wall 311, a top wall 312, and a bottom wall 313, and the liquid cooling cavity 33 is formed within the side wall and / or the top wall and / or the bottom wall. In this way, by forming the liquid cooling cavity within the wall of the pump head of the magnetic levitation pump, the liquid cooling cavity can communicate with an external circulating cooling device through the liquid inlet and the liquid outlet, thereby achieving direct cooling and heat dissipation of the pump head part of the magnetic levitation pump. The liquid cooling cavity is integrally formed with the pump head and does not additionally increase the occupied space of the pump head.

[0070] The present invention places no limitation on the position of the liquid cooling cavity within the wall, that is, the liquid cooling cavity can be formed at least in one of the side wall, the top wall, and the bottom wall. For example, according to the different materials of the wall of the pump head, a more favorable position of the liquid cooling cavity can be selected. For example, when the pump head is made of a highly corrosion-resistant material such as plastic polytetrafluoroethylene (PTFE), since the thermal conductivity of PTFE is relatively long, the liquid cooling cavity can be set closer to the inner wall of the wall. For example, the liquid cooling cavity can be set at the position adjacent to the bottom wall and the side wall to be closer to the volute chamber of the pump head. For another example, when the pump head is made of a material with better thermal conductivity such as stainless steel, the liquid cooling cavity can be set at the middle position of the wall, etc.

[0071] According to an embodiment of the present disclosure, referring to Figure 15 and Figure 17 the side wall 311 and the bottom wall 313 are integrally formed into a lower shell, and the lower shell is fixedly connected to the top wall in a sealed manner. The top wall is also referred to as a top plate or an upper shell. The top wall generally includes a plate body and a convex portion protruding toward the volute chamber in the middle, that is, a step is formed at the junction of the convex portion and the plate body. The side wall of the lower shell is flush with the outer edge of the plate body, and the outer side surface of the convex portion of the top wall contacts the inner side surface of the side wall of the lower shell. Referring to Figure 17, preferably, a first groove 34 is formed inside the side wall of the lower housing at one end facing the top wall, and a first sealing ring 35 is provided in the first groove 34. In this way, when the top wall and the side wall of the lower housing are locked together by fasteners, the first sealing ring can achieve a sealed and fixed connection between the top wall and the lower housing. In other embodiments, the side wall and the top wall can also be integrally formed into an upper housing. Based on the same principle, a sealed and fixed connection can also be achieved between the upper housing and the bottom wall by setting a sealing ring and using fasteners.

[0072] According to an embodiment of the present disclosure, referring to Figure 16 , Figure 17 and Figure 18 , the lower housing further includes a pressing plate 314. The liquid cooling cavity 33 is formed inside the side wall of the lower housing, and the opening of the liquid cooling cavity facing the bottom wall is sealed and fixed by the pressing plate. In this way, a cavity (liquid cooling cavity) can be first made on the shell wall of the pump head by machining or injection molding, and then the pressing plate can be covered on the opening of the liquid cooling cavity facing the bottom wall for fixed sealing. The sealed and fixed connection between the pressing plate and the side wall or the bottom wall can be achieved by fasteners, bonding or welding. In one embodiment, referring to Figure 16 , the pressing plate is locked to the bottom wall and the side wall of the shell wall by a plurality of fasteners. In another embodiment, when the pump head is made of a metal such as stainless steel, a sealed and fixed connection can be achieved by welding. Since the pump head is welded with a metal such as stainless steel and no sealing ring needs to be provided, the size of the liquid cooling cavity can be designed to be larger to provide a cooling effect.

[0073] When the pump head is made of a material such as PTFE, sealing can also be achieved by setting a sealing ring. Preferably, referring to Figure 17 , a second groove 36 is provided at the opening of one end of the liquid cooling cavity 33 facing the pressing plate 314, and a second sealing ring 37 is provided in the second groove 36. In this way, when the pressing plate and the side wall and the bottom wall of the lower housing are locked together by fasteners, the second sealing ring can achieve a sealed and fixed connection between the pressing plate and the lower housing. In other embodiments, the liquid cooling cavity can also be directly formed as a flow channel surrounding the volute chamber inside the shell wall of the pump head.

[0074] According to an embodiment of the present disclosure, referring to Figure 15 , Figure 17 and Figure 18, at the center of the top wall 312 of the pump head, a pump head inlet pipe 3121 is formed, and on one side of the side wall 311, a pump head outlet pipe 3111 is formed. 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 of the pump head is arranged on the side wall, and the annular liquid cooling cavity needs to avoid passing through the pump head outlet pipe, in this way, while maximizing the flow area of the liquid cooling cavity, the design of the pump head outlet pipe can be unaffected. The pump head inlet pipe 3121 and the pump head outlet pipe 3111 are used to connect external pipelines to realize the circulating pumping of the pumping system. For example, the pump head inlet pipe 3121 and the pump head outlet pipe 3111 are tubular interfaces and can be threaded to connect external pipelines, but are not limited thereto, and other connection methods are also possible.

[0075] According to an embodiment of the present disclosure, referring to Figure 16 , Figure 17 and Figure 18 , a rotor engaging portion 315 is formed at the center of the bottom wall 313 of the pump head. In this way, when the magnetic levitation rotor 200 is arranged in the pump head, it is limited by the rotor engaging portion 315. And through the cooperation between the rotor engaging portion and the rotor cavity of the magnetic levitation stator, the configuration of an inner rotor or an outer rotor magnetic levitation motor can be realized. For example, referring to Figure 14 , the magnetic levitation motor is an inner rotor. In this way, the rotor body 321 of the rotor impeller 32 is accommodated in the space of the rotor engaging portion. For the rotor cavity of the magnetic levitation stator, the rotor engaging portion of the pump head protrudes into the rotor cavity to form an inner rotor type magnetic levitation motor. But it is not limited thereto. In other embodiments, the magnetic levitation motor can also be an outer rotor. At this time, the rotor engaging portion is configured as a hollow convex column portion protruding inward from the bottom wall of the pump head. The rotor body can be in a circular ring shape and sleeved on the convex column portion, and the magnetic levitation stator is arranged in the hollow portion of the convex column portion to form an outer rotor type magnetic levitation motor.

[0076] In another embodiment, the magnetic levitation device is configured as a magnetic levitation mixer. In the application of the magnetic levitation mixer, the magnetic levitation mixer includes the magnetic levitation motor in the above embodiments, and further includes a stirring device. The stirring device includes a stirring container and a rotor stirring head arranged in the stirring container. The magnetic levitation rotor is both the rotor of the magnetic levitation motor and a part of the rotor stirring head of the stirring device, and the magnetic levitation stator is configured to drive the rotor stirring head to rotate and levitate.

[0077] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A liquid-cooled housing, characterized in that: The invention comprises a casing body (11) and a base (12), wherein the casing body comprises an annular outer shell (111), a central tube (112) and a first base plate (113) connected between the annular outer shell and the central tube, wherein the annular outer shell, the central tube and the first base plate form an annular space (114); the base comprises a second base plate (121) and a central column (122) formed in the middle of the second base plate, a first liquid cooling cavity (1111) is formed in the annular outer shell, one end of the central tube is an open end (1121), and the central tube is in contact with the open end. The other end opposite to the opening end is a closed end (1122); the edge of the second bottom plate is sealed and fixedly connected to one end of the annular shell, the central column is inserted into the central tube through the opening end, and a second liquid cooling chamber (1123) is formed between the outer wall of the central column and the inner wall of the central tube, and a first flow port (123) and a second flow port (124) spaced apart from each other are formed on the second bottom plate, the first flow port is connected to the first part (11111) of the first liquid cooling chamber, and the second flow port is connected to the second part (11112) of the first liquid cooling chamber; Furthermore, the first flow port is connected to the first side portion (11231) of the second liquid cooling chamber, and the second flow port is connected to the second side portion (11232) of the second liquid cooling chamber.

2. A liquid-cooled housing according to claim 1, characterized in that: A third liquid cooling cavity (125) is formed between the second bottom plate and the first bottom plate, connecting the first liquid cooling cavity and the second liquid cooling cavity. A partition (126) is formed on one side of the first bottom plate or one side of the second bottom plate. The partition divides the third liquid cooling cavity into a first connecting portion (1251) and a second connecting portion (1252). The first connecting portion connects a first part of the first liquid cooling cavity and a first side of the second liquid cooling cavity; the second connecting portion connects a second part of the first liquid cooling cavity and a second side of the second liquid cooling cavity.

3. A liquid-cooled housing according to claim 2, characterized in that: One side of the annular housing is provided with an outlet box (13); the first liquid cooling cavity extends circumferentially from one side of the outlet box to the other opposite side; the first flow opening is arranged close to the outlet box and connected to the first connecting portion; the second flow opening and the first flow opening are arranged symmetrically relative to the partition portion.

4. The liquid-cooled housing according to claim 3, characterized in that: The partition is in the shape of a long strip extending in a radial direction, and the central column is located on the partition.

5. The liquid-cooled housing according to claim 4, characterized in that: 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 cylinder.

6. The liquid-cooled housing according to claim 3, characterized in that: The portion of the first liquid cooling chamber close to the second bottom plate is configured as an annular chamber (11113), and the first flow opening and the second flow opening are arranged at a position where the annular chamber is connected to the third liquid cooling chamber.

7. The liquid-cooled housing according to claim 2, characterized in that: The third liquid cooling cavity is formed on the second bottom plate or the first bottom plate, or a part of the third liquid cooling cavity is formed on the second bottom plate, and another part of the third liquid cooling cavity is formed on the first bottom plate.

8. The liquid-cooled housing according to claim 2, characterized in that: A plurality of protrusions (1112) extending in the axial direction are formed on the inner wall of the annular shell, and the plurality of protrusions are arranged at intervals in the circumferential direction; an axial flow channel (1113) extending in the axial direction 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. The 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 via a radial flow channel (1114), and an opening of the radial flow channel on the annular housing is sealed by a plug (14).

10. The liquid-cooled housing according to claim 1, characterized in that: The second bottom plate is in contact with the first bottom plate, and a first flow channel (1253) and a second flow channel (1254) are formed between the second bottom plate and the first bottom plate, the first flow channel connects the first part of the first liquid cooling chamber and the first side of the second liquid cooling chamber, and the second flow channel connects the second part of the first liquid cooling chamber and the second side of the second liquid cooling chamber.

11. The liquid-cooled housing according to claim 10, characterized in that: The first flow channel is formed on the second bottom plate or on the first bottom plate, or a portion of the first flow channel is formed on the second bottom plate and another portion of the first flow channel is formed on the first bottom plate; the second flow channel is formed on the second bottom plate or on the first bottom plate, or a portion of the second flow channel is formed on the second bottom plate and another portion of the second flow channel is formed on the first bottom plate.

12. The liquid-cooled housing according to claim 1, characterized in that: A first pipeline connector (15) is provided in the first circulation port, and a second pipeline connector (16) is provided in the second circulation port.

13. A magnetic levitation motor, characterized in that: The invention comprises a magnetic levitation stator (100), wherein the magnetic levitation stator comprises the liquid-cooled casing (1) and the stator assembly (2) according to any one of claims 1 to 12, wherein the stator assembly is arranged in the annular space, wherein the stator assembly comprises a plurality of stator teeth (21) and a plurality of winding coils (22), wherein the stator teeth comprise a longitudinal portion (211) arranged in an axial direction and a transverse portion (212) arranged in a radial direction, wherein the transverse portions of the plurality of stator teeth enclose a rotor cavity, and the longitudinal portions of the plurality of stator teeth are arranged around the central tube, and wherein at least one winding coil is correspondingly sleeved on each of the longitudinal portions.

14. A magnetic levitation device, characterized in that: The magnetic levitation motor comprises the magnetic levitation motor as claimed in claim 13, further comprising a magnetic levitation rotor (200), wherein the magnetic levitation stator is configured to drive the magnetic levitation rotor to suspend 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 comprising a pump head (300), the pump head comprising a pump housing (31) and a rotor impeller (32) arranged in the pump housing, the magnetic levitation rotor being a part of the rotor impeller, a liquid cooling cavity (33) being formed in a shell wall of the pump housing, and a liquid inlet (331) and a liquid outlet (332) being formed on the shell wall and communicating with the liquid cooling cavity.

16. The magnetic levitation device according to claim 15, characterized in that: The shell wall comprises a side wall (311), a top wall (312) and a bottom wall (313), and the liquid cooling cavity is formed in 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 suspension device is configured as a magnetic suspension mixer.

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