A rotor suspension and stable rotation device

Abstract

The present invention discloses a rotor suspension and stable rotation device, which includes a machine shell provided with a first cavity and a second cavity. The bottom edge of the second cavity is recessed towards the first cavity to form a first annular groove, and the middle part of the second cavity continues to be recessed towards the first cavity to form a convex column. The convex column passes through the first cavity, and the central through hole of the rotor assembly is sleeved on the convex column, and the central through hole does not contact the convex column. The rotor assembly is suspended in the first cavity under the action of the permanent magnetic force between the convex column, and there is a gap between the outer side wall of the rotor assembly and the outer cavity wall of the first cavity. A magnetic bearing assembly for straightening the rotor assembly is installed in the first annular groove, and a motor stator assembly for driving the circumferential rotation of the rotor assembly is installed in the second cavity. The beneficial effects of the present invention are: the rotor assembly can be automatically centered and suspended in the first cavity, and the rotation attitude of the rotor assembly can be adjusted so that the rotor assembly rotates within a preset trajectory.

Description

Technical Field

[0001] The present invention relates to the application of implantable cardiac assist devices, and particularly to a rotor suspension and stable rotation device. Background Art

[0002] The application of implantable cardiac assist devices to achieve long-term circulatory support has become an effective method for clinically treating advanced heart failure. The "continuous flow blood pump" that has rapidly developed in recent years is more suitable for long-term in-vivo implantation. The "continuous flow blood pump" mainly includes two types: axial flow pumps and centrifugal pumps, both of which use high-speed rotating impellers to drive blood flow. The traditional impeller support system is a mechanical bearing, which can limit the movement of the rotating impeller both radially and axially, and has high stiffness and a compact structure. The disadvantage of mechanical bearings is that the mutually sliding contact surfaces will generate friction, wear, and local temperature rise during operation, forming a blood stasis area and thrombus attachment points around the bearings. The high-speed rotating impellers of the third-generation implantable cardiac assist devices are supported by magnetic bearings, such as the "HeartMate 3" and "HeartWare HVAD" centrifugal pumps commonly used in the United States. However, blood pumps for long-term in-vivo application need to overcome some important drawbacks, such as: thromboembolism, bleeding, infection, blood pump wear, and blood component damage. The five-degree-of-freedom full suspension that controls the rotating impeller with magnetic force has a relatively large volume, making it difficult to implant in patients with a smaller body size, and it is not suitable for Asian races and children.

[0003] The blood pump has a small volume, so all components are high-precision machined components, and the gaps between components are also small. As a power element, the rotor assembly cannot come into contact and friction with other components. Once contact occurs, it is easy to cause the rotor assembly to collide with other components, resulting in damage to the blood pump. Moreover, if friction occurs, heat will be generated by friction, producing a large amount of heat energy, which will seriously endanger human life safety. Through continuous research by the inventor, a hybrid magnetic blood pump has been developed. To ensure the reliability and stability of the hybrid magnetic blood pump, the stability of the rotation of the rotor component is crucial. Therefore, the inventor proposes a rotor suspension and stable rotation device. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a rotor suspension and stable rotation device.

[0005] The object of the present invention is achieved by the following technical solutions: A rotor suspension and stable rotation device includes a housing, a rotor assembly, a magnetic bearing assembly, and a motor stator assembly. The housing is provided with a first cavity and a second cavity. The first cavity is located above the second cavity. The bottom edge of the second cavity is recessed towards the first cavity to form a first annular groove. The middle part of the second cavity continues to be recessed towards the first cavity to form a convex column. The convex column passes through the first cavity. The central through hole of the rotor assembly is sleeved on the convex column, and the central through hole does not contact the convex column. The rotor assembly is suspended in the first cavity under the action of the permanent magnetic force between it and the convex column, and there is a gap between the outer side wall of the rotor assembly and the outer cavity wall of the first cavity. A magnetic bearing assembly for straightening the rotor assembly is installed in the first annular groove, and a motor stator assembly for driving the circumferential rotation of the rotor assembly is installed in the second cavity.

[0006] Optionally, a first permanent magnet is fixedly installed in the inner cavity of the convex column. A circular second permanent magnet and multiple pairs of rotor magnets are installed on the rotor assembly. The multiple pairs of rotor magnets are evenly distributed on the same circumference, and the magnetic poles of adjacent rotor magnets are opposite. The diameter of the circle where the second permanent magnet is located is smaller than the diameter of the circle where the rotor magnets are located. The rotor assembly is suspended in the first cavity under the magnetic attraction of the first permanent magnet and the second permanent magnet.

[0007] Optionally, the rotor assembly includes a rotor housing, a cover plate, and a support ring. The rotor housing is in a cylindrical shape, and the central hole of the rotor housing is the central through hole. An impeller is provided on the upper end face of the rotor housing. A second annular groove is opened on the lower end face of the rotor housing towards the impeller direction. A support ring is installed in the second annular groove, and the support ring is pressed by a cover plate installed on the rotor housing. An annular cavity is formed between the inner side wall of the support ring and the inner ring wall of the second annular groove. The second permanent magnet is fixedly installed in the annular cavity. A plurality of fixing grooves are provided on the support ring, and rotor magnets are installed in the fixing grooves. The plurality of fixing grooves are evenly distributed on the same circumference, and the diameter of the circle where the fixing grooves are located is larger than the diameter of the circle where the second permanent magnet is located.

[0008] Optionally, a second magnetic isolation sleeve is further installed on the support ring, and the second magnetic isolation sleeve is located between the second permanent magnet and the rotor magnets.

[0009] Optionally, the magnetic bearing assembly includes an annular first stator iron core and a sensor for detecting the magnetic force change of the second permanent magnet. A radially inward convex first magnetic pole is provided on the inner ring of the first stator iron core. The inner side wall of the first magnetic pole is an arc side wall, and the circumference where the inner side wall of the first magnetic pole is located is coaxially arranged with the circumference where the rotor magnets are located. A first coil is installed on the first magnetic pole, and an insulating layer is provided between the first coil and the first magnetic pole. The stator iron core is attached to the outer ring side wall of the first annular groove, and the inner side wall of the first magnetic pole is attached to the inner ring side wall of the first annular groove. The sensor is fixedly installed in the inner cavity of the convex column, and the sensor is located below the first permanent magnet.

[0010] Optionally, a magnetic isolation member is provided between the sensor and the first permanent magnet.

[0011] Optionally, the motor stator assembly includes an annular second stator core, the second stator core is installed at the bottom of the second cavity, a raised second magnetic pole is provided on the lower end surface of the second stator core, a second coil is installed on the second magnetic pole, and an insulating layer is provided between the second coil and the second magnetic pole. In the axial projection plane, the circumference where the second magnetic pole is located is within the movement track of the rotor magnet.

[0012] Optionally, the cavity of the second cavity is provided with a downwardly protruding convex ring, and a first magnetic isolation sleeve is sleeved on the convex ring, and the first magnetic isolation sleeve is located within the inner ring of the motor stator assembly.

[0013] Optionally, a fixing member is further installed in the inner cavity of the convex column, the sensor is fixed between the magnetic isolation member and the fixing member, a cushion block is further installed at the bottom of the inner cavity of the convex column, and the first permanent magnet abuts against the cushion block.

[0014] Optionally, both the first permanent magnet and the second permanent magnet are multiple and are stacked.

[0015] The present invention has the following advantages: The rotor suspension and stable rotation device of the present invention is provided with a first permanent magnet and a second permanent magnet. Under the action of the first permanent magnet and the second permanent magnet, the rotor assembly can automatically center and suspend in the first cavity.

[0016] For the rotor suspension and stable rotation device of the present invention, after the rotor assembly deviates from the preset track, the sensor can judge the deviation direction of the rotor assembly through the magnetic force change of the second permanent magnet, and by adjusting the magnetic force change of the corresponding first coil on the corresponding rotor magnet, the circumferential force on the rotor assembly can be changed, so that the rotor assembly can be righted. Moreover, the magnetic forces of the first permanent magnet and the second permanent magnet can prevent the rotor assembly from deviating from the preset track and can promote the centering of the rotor assembly, thereby reducing the energy consumption of the rotor assembly during the righting process after deviating from the preset track, and further reducing the energy consumption.

[0017] For the rotor suspension and stable rotation device of the present invention, by providing a magnetic isolation member, a first magnetic isolation sleeve and a second magnetic isolation sleeve, the magnetic field of the first permanent magnet, the magnetic field of the first coil on the magnetic bearing assembly and the magnetic field of the second coil on the motor stator assembly are prevented from causing magnetic interference to the sensor, thereby improving the reliability of the sensor detecting the magnetic force change of the second permanent magnet, and further improving the reliability of the magnetic bearing assembly in righting the rotor assembly. Description of the Drawings

[0018] Figure 1 is a structural schematic diagram of a hybrid magnetic blood pump;

[0019] Figure 2 is a cross-sectional schematic diagram of a hybrid magnetic blood pump;

[0020] Figure 3 Schematic diagram of the installation of the rotor assembly, magnetic bearing assembly, and motor stator assembly inside the housing Figure 1 ;

[0021] Figure 4 Schematic diagram of the installation of the rotor assembly, magnetic bearing assembly, and motor stator assembly inside the housing Figure 2 ;

[0022] Figure 5 Schematic cross-sectional view of the installation of the rotor assembly, magnetic bearing assembly, and motor stator assembly inside the housing;

[0023] Figure 6 Schematic diagram of the structure of the rotor assembly;

[0024] Figure 7 Schematic cross-sectional view of the rotor assembly;

[0025] Figure 8 Schematic diagram of the structure of the rotor housing;

[0026] Figure 9 Schematic diagram of the assembly of the support ring and the cover plate;

[0027] Figure 10 Schematic diagram of the positions where the annular cavity and the magnetic steel installation cavity are opened in the rotor assembly;

[0028] Figure 11 Schematic diagram of the structure of the magnetic bearing assembly;

[0029] Figure 12 Schematic diagram of the structure of the motor stator assembly;

[0030] Figure 13 Schematic cross-sectional view of the motor stator assembly;

[0031] Figure 14 Schematic diagram of the structure of the housing Figure 1 ;

[0032] Figure 15 Schematic diagram of the structure of the housing Figure 2 ;

[0033] Figure 16 Schematic diagram of the installation of the first permanent magnet;

[0034] Figure 17 Schematic cross-sectional view of the rotor assembly;

[0035] In the figure, 10 - sealing cover, 20 - volute, 30 - liquid inlet pipe, 40 - liquid outlet pipe, 100 - housing, 200 - rotor assembly, 300 - magnetic bearing assembly, 400 - motor stator assembly, 101 - first cavity, 102 - convex post, 103 - blind hole, 104 - first permanent magnet, 105 - spacer, 106 - magnetic isolation part, 107 - fixing part, 108 - sensor, 109 - convex ring, 110 - first magnetic isolation sleeve, 111 - second cavity, 112 - first annular groove, 201 - rotor housing, 202 - impeller, 203 - central through hole, 204 - second annular groove, 205 - cover plate, 206 - second permanent magnet, 207 - second magnetic isolation sleeve, 208 - rotor magnet, 209 - support ring, 210 - fixing groove, 211 - annular cavity, 212 - magnet installation cavity, 213 - first flow channel, 214 - second flow channel, 301 - first stator core, 302 - first magnetic pole, 303 - first coil, 401 - second stator core, 402 - second magnetic pole, 403 - second coil. Detailed implementation manners

[0036] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0039] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. 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 on the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Such as Figure 3 , Figure 4 and Figure 5As shown in the figure, a rotor suspension and stable rotation device includes a housing 100, a rotor assembly 200, a magnetic bearing assembly 300, and a motor stator assembly 400. The housing 100 is provided with a first cavity 101 and a second cavity 111. In this embodiment, both the first cavity 101 and the second cavity 111 are circular cavities. The upper end of the first cavity 101 is open, and the lower end of the second cavity 111 is open. Further, the housing 100 is machined in one piece and can be completed by casting or machining. The first cavity 101 and the second cavity 111 are not connected to each other and are separate and independent cavities. The first cavity 101 is located above the second cavity 111. The bottom edge of the second cavity 111 is recessed toward the first cavity 101 to form a first annular groove 112. The middle part of the second cavity 111 continues to be recessed toward the first cavity 101 to form a convex column 102. The convex column 102 passes through the first cavity 101. The central through hole 203 of the rotor assembly 200 is sleeved on the convex column 102, and the central through hole 203 is not in contact with the convex column 102. Therefore, there is a gap between the central through hole 203 and the convex column 102, and this gap is the first flow channel 213. The rotor assembly 200 is suspended in the first cavity 101 under the action of the permanent magnetic force between it and the convex column 102. There is a gap between the outer side wall of the rotor assembly 200 and the outer cavity wall of the first cavity 101, and this gap becomes the second flow channel 214. Since the rotor assembly 200 is suspended, there is also a gap between the bottom of the rotor assembly 200 and the bottom of the first cavity 101. Therefore, the first flow channel 213 and the second flow channel 214 are connected to each other.

[0043] In this embodiment, as Figure 5 and Figure 16 shown, a first permanent magnet 104 is fixedly installed in the inner cavity of the convex column 102. A circular second permanent magnet 206 and multiple pairs of rotor permanent magnets 208 are installed on the rotor assembly 200. The multiple pairs of rotor permanent magnets 208 are evenly distributed on the same circumference, and the magnetic poles of adjacent rotor permanent magnets 208 are opposite. The diameter of the circumference where the second permanent magnet 206 is located is smaller than the diameter of the circumference where the rotor permanent magnets 208 are located. As Figures 6 - 10As shown, the rotor assembly 200 is suspended in the first cavity 101 under the magnetic suction force of the first permanent magnet 104 and the second permanent magnet 206. Further, the rotor assembly 200 includes a rotor housing 201, a cover plate 205, and a support ring 209. The rotor housing 201 is cylindrical, and the central hole of the rotor housing 201 is a central through hole 203. An impeller 202 is provided on the upper end face of the rotor housing 201. A second annular groove 204 is formed on the lower end face of the rotor housing 201 facing the impeller 202. A support ring 209 is installed in the second annular groove 204, and the support ring 209 is pressed by a cover plate 205 installed on the rotor housing 201. An annular cavity 211 is formed between the inner side wall of the support ring 209 and the inner ring wall of the second annular groove 204. The second permanent magnet 206 is fixedly installed in the annular cavity 211. A plurality of fixing grooves 210 are formed on the support ring 209, and rotor magnets 208 are installed in the fixing grooves 210. The plurality of fixing grooves 210 are evenly distributed on the same circumference, and the diameter of the circumference where the fixing grooves 210 are located is greater than the diameter of the circumference where the second permanent magnet 206 is located. Preferably, the sealing cover and the support ring 209 are integrally formed. During installation, first, the rotor magnets 208 are installed in the fixing grooves 210, and the second permanent magnet 206 is installed in the annular cavity 211, and then the sealing cover is installed with the rotor housing 201. In this embodiment, a second magnetic isolation sleeve 207 is also installed on the support ring 209. The second magnetic isolation sleeve 207 is located between the second permanent magnet 206 and the rotor magnets 208. Preferably, the second magnetic isolation sleeve 207 is also installed in the annular cavity 211, and the second permanent magnet 206 is sleeved in the second magnetic isolation sleeve 207. The second magnetic isolation sleeve 207 prevents the second permanent magnet 206 from causing a magnetic force effect on the rotor magnets 208, thereby ensuring the stability of the magnetic force of the second permanent magnet 206 and the reliability of the use of the rotor magnets 208.

[0044] In this embodiment, a magnetic bearing assembly 300 for straightening the rotor assembly 200 is installed in the first annular groove 112, as Figure 11As shown in the figure, the magnetic bearing assembly 300 includes an annular first stator core 301 and a sensor 108 for detecting the magnetic force change of the second permanent magnet 206. A radially inwardly protruding first magnetic pole 302 is provided on the inner ring of the first stator core 301. The inner side wall of the first magnetic pole 302 is an arc side wall, and the circumference where the inner side wall of the first magnetic pole 302 is located is coaxially arranged with the circumference where the rotor magnet 208 is located. A first coil 303 is installed on the first magnetic pole 302, and an insulating layer is provided between the first coil 303 and the first magnetic pole 302. The stator core is attached to the outer ring side wall of the first annular groove 112, and the inner side wall of the first magnetic pole 302 is attached to the inner ring side wall of the first annular groove 112. The sensor 108 is fixedly installed in the inner cavity of the convex column 102 and is located below the first permanent magnet 104. When the magnetic force change of the second permanent magnet 206 detected by the sensor 108 exceeds a preset value, it indicates that the rotor assembly 200 has deviated from its trajectory and rotated. At this time, the sensor 108 transmits a signal to the controller, and the controller controls the magnetic force of the corresponding first coil 303 to change, so that the circumferential force on the rotor assembly 200 changes, and thus the rotor assembly 200 is righted.

[0045] In this embodiment, a magnetic isolation member 106 is provided between the sensor 108 and the first permanent magnet 104, thereby avoiding the influence of the magnetic field generated by the first permanent magnet 104 on the sensor 108, and further improving the stability of the sensor 108 in detecting the magnetic force change of the second permanent magnet 206.

[0046] In this implementation, a motor stator assembly 400 for driving the rotor assembly 200 to rotate circumferentially is installed in the second cavity 111. Further, as Figure 12 shown, the motor stator assembly 400 includes an annular second stator core 401. The second stator core 401 is installed at the bottom of the second cavity 111. A protruding second magnetic pole 402 is provided on the end face of the second stator core 401 close to the sealing cover. A second coil 403 is installed on the second magnetic pole 402, and an insulating layer is provided between the second coil 403 and the second magnetic pole 402. In the axial projection plane, the circumference where the second magnetic pole 402 is located is within the movement trajectory of the rotor magnet 208. By controlling the magnetic force change of the second coil 403, the rotation of the rotor assembly 200 can be realized. In this embodiment, the cavity of the second cavity 111 is provided with a convex ring 109 protruding towards the sealing cover. A first magnetic isolation sleeve 110 is sleeved on the convex ring 109. The first magnetic isolation sleeve 110 is located within the inner circle of the motor stator assembly 400, and the first magnetic isolation sleeve 110 can avoid the influence of the magnetic field generated by the second coil 403 on the sensor 108, and further improve the stability of the sensor 108 in detecting the magnetic force change of the second permanent magnet 206.

[0047] In this embodiment, as Figure 16As shown, a fixing member 107 is further installed in the inner cavity of the convex post 102. The sensor 108 is fixed between the magnetic isolation member 106 and the fixing member 107 by the fixing member 107. A cushion block 105 is also installed at the bottom of the inner cavity of the convex post 102. The first permanent magnet 104 abuts against the cushion block 105. Preferably, both the first permanent magnet 104 and the second permanent magnet 206 are multiple and are stacked. The stacked first permanent magnet 104 and second permanent magnet 206 can improve the magnetic force stability between the first permanent magnet 104 and the second permanent magnet 206, thereby improving the stability of the rotor assembly 200 suspended in the first cavity 101. In this embodiment, the magnetic force of the first permanent magnet 104 and the second permanent magnet 206 in the circumferential direction is stable. Therefore, when the rotor assembly 200 is placed in the first cavity 101, it can automatically align with the axial line of the convex post 102 as the center line.

[0048] The rotor suspension and stable rotation device of the present invention can be used for pumping water or as a component of a blood pump implanted in the human body. The following will describe the rotor suspension and stable rotation device of the present invention in detail with the specific structure and working principle of the blood pump.

[0049] As Figure 1 and Figure 2 shown, a hybrid magnetic blood pump includes a housing 100 and a rotor assembly 200. As Figure 1 and Figure 2 shown, a volute 20 is installed at one end of the housing 100. A liquid inlet pipe 30 and a liquid outlet pipe 40 are provided on the volute 20. A volute cavity is provided inside the volute 20. In this embodiment, the liquid inlet pipe 30 is vertically arranged, and the liquid outlet pipe 40 is arranged along the tangent direction of the volute 20, so that blood can smoothly drain from the liquid outlet pipe 40 in the volute cavity.

[0050] In this embodiment, as Figure 1 and Figure 2 shown, the other end of the housing 100 is sealed by a sealing cover 10. Therefore, after the blood enters from the liquid inlet pipe 30, it can only drain from the liquid outlet pipe 40.

[0051] In this embodiment, as Figure 14 and Figure 15 shown, the end face of the housing 100 close to the volute 20 is recessed towards the direction of the sealing cover 10 to form a first cavity 101, and the end face of the housing 100 close to the sealing cover 10 is recessed towards the direction of the volute 20 to form a second cavity 111. In this embodiment, with the direction of the volute 20 as the upper and the direction of the sealing cover 10 as the lower, in this embodiment, the bottom edge of the second cavity 111 continues to be recessed towards the direction of the volute 20 to form a first annular groove 112. As Figure 16As shown, the middle part of the second cavity 111 continues to be recessed toward the volute 20 and forms a convex column 102, which passes through the first cavity 101. The inner cavity of the convex column 102 is fixedly installed with a first permanent magnet 104. In this embodiment, the volute 20 is made of an integral molding and can be processed by casting. In this embodiment, the volute 20 is a rotating body structure, so the volute 20 can also be made by machining. When the volute 20 is processed, the upper end of the volute 20 has the first cavity 101, and the lower end of the volute 20 has the second cavity 111. The first cavity 101 and the second cavity 111 are separated by a partition, and in the center of the first cavity 101 is A raised boss 102 is provided, and the boss 102 is a circular column. A blind hole 103 is opened upward from the center of the bottom of the second cavity 111, and the blind hole 103 is located in the boss 102, and the blind hole 103 forms an inner cavity of the boss 102. Furthermore, the upper end of the boss 102 is a hemispherical head structure, and the upper end of the boss 102 is located outside the first cavity 101, that is, the upper end of the boss 102 is located in the cochlear cavity. The upper end of the boss 102 is configured as a hemispherical head, and the boss 102 is coaxially configured with the liquid inlet port 30. When blood enters the cochlear cavity through the liquid inlet port 30, the upper end of the hemispherical head boss 102 will evenly disperse the blood in the cochlear cavity.

[0052] In this embodiment, the rotor assembly 200 has a central through hole 203, the boss 102 passes through the central through hole 203, the central through hole 203 is a circular hole, and the gap between the boss 102 and the central through hole 203 forms a first flow channel 213. The rotor assembly 200 is installed with an annular second permanent magnet 206 and multiple pairs of rotor magnets 208. The multiple pairs of rotor magnets 208 are evenly distributed on the same circumference, and the magnetic poles of adjacent rotor magnets 208 are opposite. The circumferential diameter of the second permanent magnet 206 is smaller than the circumferential diameter of the rotor magnet 208. Therefore, the second permanent magnet 206 is installed on the inner side of the rotor magnet 208. In this embodiment, Figure 6 , Figure 7 and Figure 8As shown, the rotor assembly 200 includes a rotor housing 201, a cover plate 205 and a support ring 209. The rotor housing 201 is cylindrical, and the central hole of the rotor housing 201 is a central through hole 203. An impeller 202 is provided on the end face of the rotor housing 201 close to the volute 20. The impeller 202 is located in the volute cavity. A second annular groove 204 is formed on the end face of the rotor housing 201 close to the seal cover 10 in the direction of the volute 20. A thin-walled structure is formed between the second annular groove 204 and the central through hole 203. A support ring 209 is installed in the second annular groove 204, and the support ring 209 is pressed by a cover plate 205 installed on the rotor housing 201. An annular cavity 211 is formed between the inner side wall of the support ring 209 and the inner ring wall of the second annular groove 204. The second permanent magnet 206 is fixedly installed in the annular cavity 211. A plurality of fixing grooves 210 are formed on the support ring 209. The rotor magnets 208 are installed in the fixing grooves 210. The plurality of fixing grooves 210 are evenly distributed on the same circumference, and the diameter of the circumference where the fixing grooves 210 are located is larger than the diameter of the circumference where the second permanent magnet 206 is located. Preferably, the fixing grooves 210 are formed at the outer edge of the support ring 209, and the projection of the fixing grooves 210 in the axial direction is fan-shaped. When the support ring 209, the rotor housing 201 and the cover plate 205 are installed, a magnet installation cavity 212 and an annular cavity 211 are formed in the rotor assembly 200. The size of the rotor magnets 208 matches the size of the magnet installation cavity 212. Therefore, when the rotor assembly 200 is assembled, as Figure 17 shown, the rotor magnets 208 are fixedly installed in the magnet installation cavity 212, and the cross section of the rotor magnets 208 is fan-shaped. In this embodiment, the support ring 209 and the cover plate 205 are of an integral structure. Therefore, during installation, after the rotor magnets 208 and the second permanent magnet 206 are installed on the support ring 209, only the rotor assembly 200 needs to be covered with the cover plate 205, as Figure 9 shown, the support ring 209 and the cover plate 205 are integrally provided. In other embodiments, the support ring 209 and the rotor housing 201 can also be integrally provided. In this embodiment, the cover plate 205 is circular. When the cover plate 205 is installed with the rotor housing 201, the outer circumferential side wall of the cover plate 205 fits with the outer ring side wall of the second annular groove 204, and the inner circumferential side wall of the cover plate 205 fits with the inner ring side wall of the second annular groove 204. Of course, the inner diameter of the support ring 209 is larger than the inner diameter of the cover plate 205.

[0053] In this embodiment, since the first permanent magnet 104 is installed in the convex column 102 and the second permanent magnet 206 is installed on the rotor assembly 200, appropriate first and second permanent magnets 104 and 206 are selected. Under the magnetic attraction of the first permanent magnet 104 and the second permanent magnet 206, the rotor assembly 200 floats in the first cavity 101. In this embodiment, the first permanent magnet 104 is cylindrical and the second permanent magnet 206 is annular. When designing the first permanent magnet 104 and the second permanent magnet 206, the coaxiality of the first permanent magnet 104 and the second permanent magnet 206 needs to be ensured. Therefore, after the rotor assembly 200 is placed in the first cavity 101, the rotor assembly 200 floats in the first cavity 101 under the magnetic force of the first permanent magnet 104 and the second permanent magnet 206, and the coaxiality of the central through hole 203 and the convex column 102 can also be ensured. Even when placed, if the axis of the central through hole 203 deviates from the center line of the convex column 102, the rotor assembly 200 will be automatically centered under the magnetic force of the first permanent magnet 104 and the second permanent magnet 206, making the axis of the central through hole 203 coincide with the axis of the convex column 102.

[0054] In this embodiment, after the first permanent magnet 104 is installed, the first permanent magnet 104 is located in the first cavity 101. To ensure the installation of the first permanent magnet 104, a spacer 105 is also installed at the bottom of the inner cavity of the convex column 102. The first permanent magnet 104 abuts against the spacer 105. The axial position of the first permanent magnet 104 can be adjusted by the thickness of the spacer 105, so as to ensure that the first permanent magnet 104 is in the first cavity 101 and ensure the correspondence between the first permanent magnet 104 and the second permanent magnet 206. In this embodiment, there are multiple first permanent magnets 104 and multiple second permanent magnets 206, that is, the number of the first permanent magnets 104 corresponds to the number of the second permanent magnets 206. When installed, the first permanent magnets 104 and the second permanent magnets 206 are both stacked. After the multiple first permanent magnets 104 and the second permanent magnets 206 are stacked, the stability of the magnetic force between the first permanent magnet 104 and the second permanent magnet 206 can be improved, and further the stability of the rotor assembly 200 floating and automatically centering in the first cavity 101 is ensured.

[0055] In this embodiment, as Figure 3 、 Figure 4 and Figure 5As shown, after the rotor assembly 200 is automatically centered and suspended in the first cavity 101, there is a gap between the outer wall of the rotor assembly 200 and the cavity wall of the first cavity 101, and this gap forms the second flow channel 214. Since the rotor assembly 200 is suspended in the first cavity 101, the first flow channel 213 and the second flow channel 214 can be connected through the bottom of the first cavity 101. Moreover, the upper part of the first flow channel 213 is connected to the volute cavity, and the upper part of the second flow channel 214 is connected to the volute cavity. Thus, a circulation channel is formed among the first flow channel 213, the second flow channel 214, the volute cavity and the bottom of the first cavity 101. When the rotor rotates at a high speed, the pressure in the first flow channel 213 is less than the pressure in the second flow channel 214. Therefore, the blood in the second flow channel 214 will flow into the first flow channel 213, enter the volute cavity from the first flow channel 213, and finally be discharged through the liquid outlet pipe orifice 40. Therefore, this hybrid magnetic blood pump will not generate stagnant blood, thus ensuring the reliability of the use of the hybrid magnetic blood pump. Further, in order to ensure the fluidity of the blood and avoid the occurrence of stagnant blood, the bottom edge of the first cavity 101 and the connection between the convex column 102 and the first cavity 101 are both arc-shaped structures.

[0056] In this embodiment, as Figure 16 shown, a sensor 108 for detecting the magnetic force change of the second permanent magnet 206 is fixedly installed in the inner cavity of the convex column 102. The sensor 108 is located between the first permanent magnet 104 and the sealing cover 10. By detecting the magnetic force change of the second permanent magnet 206, the rotation state of the rotor assembly 200 can be judged. The sensor 108 is a Hall sensor 108, which is a commercially available product;

[0057] In this embodiment, as Figure 5 shown, a magnetic bearing assembly 300 for straightening the rotor assembly 200 is installed in the first annular groove 112. When the rotor assembly 200 works, the rotor assembly 200 is enclosed in the flowing blood, and the blood coming in from the liquid inlet pipe orifice 30 will also have a certain impact on the rotor assembly 200. Therefore, when the rotor assembly 200 works, under the flow of the fluid, the rotor assembly 200 may deflect. After the rotor assembly 200 deflects, the positions of the second permanent magnet 206 and the sensor 108 will also change relatively, resulting in a change in the magnetic force of the second permanent magnet 206 at the sensor 108. After the sensor 108 detects the magnetic force change of the second permanent magnet 206, the sensor 108 will transmit it to the controller of the hybrid magnetic blood pump. The controller will control the magnetic bearing assembly 300 to adjust the magnetic force magnitude, and then change the magnetic force magnitude of the magnetic bearing assembly 300 on the rotor assembly 200 in one or more directions, so that the rotor assembly 200 is straightened, avoiding the collision of the rotor assembly 200 with other components, and thus ensuring the stability of the use of the hybrid magnetic blood pump.

[0058] In this embodiment, as Figure 11As shown, the magnetic bearing assembly 300 includes an annular first stator core 301. A radially inwardly protruding first magnetic pole 302 is provided on the inner ring of the first stator core 301. The inner side wall of the first magnetic pole 302 is an arc side wall, and the circumference where the inner side wall of the first magnetic pole 302 is located is coaxially arranged with the circumference where the rotor magnet 208 is located. A first coil 303 is installed on the first magnetic pole 302, and an insulating layer is provided between the first coil 303 and the first magnetic pole 302. The stator core is attached to the outer ring side wall of the first annular groove 112, and the inner side wall of the first magnetic pole 302 is attached to the inner ring side wall of the first annular groove 112, realizing the installation of the magnetic bearing assembly 300 in the first annular groove 112. Preferably, the insulating layer is insulating paint. Further, the number of the first magnetic poles 302 is a positive integer multiple of the number of the rotor magnets 208. For example, if the rotor magnets 208 are in two teams, that is, the number of the rotor magnets 208 is four, the number of the first magnetic poles 302 is a positive integer multiple of four, such as four or eight or twelve. That is to say, the number of the first coils 303 is four or eight or twelve, and the rotor magnets 208 need to correspond to the corresponding first coils 303. In this embodiment, when the rotor assembly 200 is not skewed, the magnetic force generated by the first coil 303 on the corresponding rotor magnet 208 is the same, either attractive force or repulsive force. Since the magnetic poles of adjacent rotor magnets 208 are opposite and the rotor magnets 208 rotate circumferentially while the positions of the first coils 303 are fixed, when the rotor magnets 208 rotate, the magnetic field direction of the first coils 303 needs to change continuously, so as to make the magnetic force generated by the magnetic field of the first coils 303 on the corresponding rotor magnets 208 be the same, either attractive force or repulsive force. Preferably, the number of the rotor magnets 208 is four, and the number of the first coils 303 is also four. Therefore, when the rotor magnets 208 rotate one circle, the number of times the magnetic fields of all the first coils 303 change is four times. Assuming that the rotor assembly 200 rotates 1000 revolutions per minute, at this time the rotor magnets 208 rotate 1000 revolutions, and the number of times the magnetic fields of the first coils 303 change is 4000 times. If the number of the second coils 403 is eight, after the rotor assembly 200 rotates 1000 revolutions per minute, the number of times the magnetic fields of all the first coils 303 change is 8000 times. When the rotor assembly 200 is skewed during rotation, after the sensor 108 detects the change in the magnetic force of the second permanent magnet 206, the sensor 108 transmits the signal to the controller, and the controller adjusts the magnetic force magnitude of the corresponding first coil 303, so as to straighten the rotor assembly 200. During the straightening process of the rotor assembly 200, the magnetic force of the second permanent magnet 206 detected by the sensor 108 also changes continuously, and the controller corrects the magnetic force of the corresponding first coil 303 according to the continuously changing magnetic force of the second permanent magnet 206 detected by the sensor 108, so as to ensure that the rotor assembly 200 can be straightened smoothly, and further avoid the rotor assembly 200 from colliding with other components.

[0059] In this embodiment, the rotor assembly 200 also has an automatic centering function under the magnetic force of the first coil 303 and the rotor magnet 208. Therefore, under the dual magnetic forces of the first permanent magnet 104, the second permanent magnet 206, the first coil 303 and the rotor magnet 208, the reliability of the automatic centering of the rotor assembly 200 can be further improved. Once the hybrid magnetic blood pump is assembled, the rotor assembly 200 will be suspended in the first cavity 101. During transportation and handling, the rotor assembly 200 will still be suspended in the first cavity 101 under the dual magnetic forces of the first permanent magnet 104, the second permanent magnet 206, the first coil 303 and the rotor magnet 208, thus avoiding the collision of the rotor assembly 200 with other components during transportation and handling, and avoiding the damage of the hybrid magnetic blood pump during transportation and handling, reducing the requirements for transportation and handling of the hybrid magnetic blood pump.

[0060] In this embodiment, a motor stator assembly 400 for driving the rotor assembly 200 to rotate circumferentially is installed in the second cavity 111. In this embodiment, as Figure 12 and Figure 13 shown, the motor stator assembly 400 includes an annular second stator core 401. The second stator core 401 is installed on the bottom of the second cavity 111. A protruding second magnetic pole 402 is provided on the end face of the second stator core 401 close to the sealing cover 10. A second coil 403 is installed on the second magnetic pole 402. An insulating layer is provided between the second coil 403 and the second magnetic pole 402. Preferably, the insulating layer is insulating paint. In the axial projection plane, the circumference where the second magnetic pole 402 is located is within the movement track of the rotor magnet 208. In this embodiment, there are eight second magnetic poles 402, so there are also eight second coils 403. When the second coil 403 is energized, the second coil 403 will generate a pulling force on the rotor magnet 208, so that the rotor magnet 208 rotates circumferentially, and further the rotor assembly 200 rotates circumferentially. In this embodiment, the rotor magnet 208 is a common magnet for the magnetic bearing assembly 300 and the motor stator assembly 400. The cooperation between the rotor magnet 208 and the magnetic bearing assembly 300 can play a function of automatically centering and straightening the rotor assembly 200, while the cooperation between the rotor magnet 208 and the motor stator assembly 400 can realize the circumferential rotation of the rotor assembly 200. In this embodiment, the width of the second magnetic pole 402 in the radial direction is the same as the width of the rotor magnet 208. Therefore, the circumference where the second magnetic pole 402 is located coincides with the circumference where the rotor magnet 208 is located in the axial projection.

[0061] In this embodiment, one end of the first permanent magnet 104 close to the volute 20 is the head, and one end of the first permanent magnet 104 close to the sealing cover 10 is the tail. A magnetic isolation member 106 is installed at the tail of the first permanent magnet 104. A fixing member 107 is also installed in the inner cavity of the convex post 102. The sensor 108 is fixed between the magnetic isolation member 106 and the fixing member 107 by the fixing member 107. The magnetic isolation member 106 covers the entire tail of the first permanent magnet 104. Therefore, a magnetic isolation effect can be formed at the tail of the first permanent magnet 104, so that the sensor 108 will not detect the magnetic field of the first permanent magnet 104, thereby avoiding the influence of the magnetic field generated by the first permanent magnet 104 on the sensor 108, ensuring the reliability of the sensor 108 for detecting the magnetic force of the second permanent magnet 206, and further improving the reliability of the magnetic bearing assembly 300 for straightening the rotor assembly 200.

[0062] In this embodiment, a second magnetic isolation sleeve 207 is also installed on the support ring 209. The second magnetic isolation sleeve 207 is located between the second permanent magnet 206 and the rotor magnet 208. Preferably, the second permanent magnet 206 is sleeved in the second magnetic isolation sleeve 207, and the second magnetic isolation sleeve 207 is sleeved in the annular cavity 211. The second magnetic isolation sleeve 207 blocks the magnetic path between the first coil 303 and the second permanent magnet 206, and the second magnetic isolation sleeve 207 also blocks the magnetic path between the rotor magnet 208 and the second permanent magnet 206, thereby avoiding the influence of the first coil 303 and the rotor magnet 208 on the magnetic path of the second permanent magnet 206, ensuring the stability of the magnetic force of the second permanent magnet 206, and improving the reliability of judging the skew of the rotor assembly 200 by detecting the change of the magnetic force of the second permanent magnet 206 by the sensor 108.

[0063] In this embodiment, the cavity of the second cavity 111 is provided with a convex ring 109 protruding towards the sealing cover 10. A first magnetic isolation sleeve 110 is sleeved on the convex ring 109. The first magnetic isolation sleeve 110 is located within the inner circle of the motor stator assembly 400. In this embodiment, to increase the magnetic force of the first permanent magnet 104 and the second permanent magnet 206, preferably, the thickness after the lamination of the first permanent magnet 104 and the second permanent magnet 206 is close to the depth of the first cavity 101. Therefore, when the sensor 108 is installed, part or all of the sensor 108 is located within the inner ring of the electronic rotor assembly 200. By providing the convex ring 109, an installation space is provided for the installation of the fixing member 107, the sensor 108, and the magnetic isolation member 106. By sleeving the first magnetic isolation sleeve 110 on the convex ring 109, the first magnetic isolation sleeve 110 avoids the influence of the magnetic field generated by the second coil 403 on the sensor 108. Therefore, in this embodiment, the part between the first magnetic isolation sleeve 110 and the magnetic isolation member 106 forms the magnetic channel of the second permanent magnet 206. The sensor 108 can only detect the change in the magnetic force of the second permanent magnet 206 passing through the magnetic channel, thereby improving the reliability of the sensor 108 in detecting the magnetic force of the second permanent magnet 206, and further improving the reliability of the magnetic bearing assembly 300 in straightening the rotor assembly 200.

[0064] The working process of the hybrid magnetic blood pump is as follows: After the hybrid magnetic blood pump is assembled, the rotor assembly 200 is automatically centered and suspended in the first cavity 101 under the magnetic force of the first permanent magnet 104 and the second permanent magnet 206. After the hybrid magnetic blood pump is implanted into the human body, the liquid inlet pipe orifice 30 will enter the blood, and the blood will fill the volute cavity and the first cavity 101. The controller controls the second coil 403 on the electronic stator assembly 200 to work according to a certain rule, so that the second coil 403 generates a magnetic suction force on the rotor magnet 208, so that the rotor magnet 208 rotates circumferentially, and then the rotor assembly 200 rotates circumferentially. During the rotation of the rotor assembly 200, the rotor assembly 200 rotates in the flowing blood. Therefore, the flow of the blood will affect the position of the rotor assembly 200, and then the rotor assembly 200 cannot rotate in a centered manner. When the rotor assembly 200 deviates from the preset rotation trajectory, the sensor 108 will detect the change in the magnetic force of the second permanent magnet 206 at this time. The sensor 108 transmits the signal of the magnetic force change to the controller. The controller controls the magnetic force of the corresponding first coil 303 on the magnetic bearing assembly 300 to change according to the received signal, so that the magnetic force between the first coil 303 and the rotor magnet 208 changes, and then the force of the rotor assembly 200 in one or more directions in the radial direction changes, and then the rotor assembly 200 is righted. During this righting process, the magnetic force of the second permanent magnet 206 detected by the sensor 108 is constantly changing, and the controller will adjust the magnetic force generated by the corresponding first coil 303 according to the constantly changing magnetic force signal of the second permanent magnet 206, so as to improve the reliability of righting the rotor assembly 200. Moreover, when the rotor assembly 200 rotates deviating from the preset trajectory, the magnetic suction force between the first permanent magnet 104 and the second permanent magnet 206 will also promote the automatic righting of the rotor assembly 200. At the same time, the magnetic suction force between the first permanent magnet 104 and the second permanent magnet 206 can also prevent the rotor assembly 200 from deviating from the preset trajectory. Therefore, the rotor assembly 200 can be quickly and reliably righted under the action of the magnetic force between the first coil 303 and the rotor magnet 208 and the action of the first permanent magnet 104 and the second permanent magnet 206. And due to the setting of the first permanent magnet 104 and the second permanent magnet 206, a permanent magnetic force will be generated between the first permanent magnet 104 and the second permanent magnet 206, thereby reducing the energy consumption of the hybrid magnetic blood pump. Under the same output power, the energy consumption is reduced. Therefore, under the same electric energy, the usage time is extended, and the frequency of replacing the electric energy is reduced.

[0065] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A rotor suspension and stable rotation device, characterized in that: It includes a housing, a rotor assembly, a magnetic bearing assembly and a motor stator assembly. A first cavity and a second cavity are formed in the housing. The first cavity is located above the second cavity. The bottom edge of the second cavity is recessed towards the first cavity to form a first annular groove. The middle part of the second cavity continues to be recessed towards the first cavity to form a convex column. The convex column passes through the first cavity. The central through hole of the rotor assembly is sleeved on the convex column, and the central through hole does not contact the convex column. The rotor assembly is suspended in the first cavity under the action of the permanent magnetic force between it and the convex column. There is a gap between the outer side wall of the rotor assembly and the outer cavity wall of the first cavity. The magnetic bearing assembly for straightening the rotor assembly is installed in the first annular groove. The motor stator assembly for driving the rotor assembly to rotate circumferentially is installed in the second cavity; A first permanent magnet is fixedly installed in the inner cavity of the convex column. A circular second permanent magnet and multiple pairs of rotor magnetic steels are installed on the rotor assembly. The multiple pairs of rotor magnetic steels are evenly distributed on the same circumference, and the magnetic poles of adjacent rotor magnetic steels are opposite. The diameter of the circle where the second permanent magnet is located is smaller than the diameter of the circle where the rotor magnetic steels are located. The rotor assembly is suspended in the first cavity under the magnetic attraction of the first permanent magnet and the second permanent magnet; The rotor assembly includes a rotor housing, a cover plate and a support ring. The rotor housing is cylindrical, and the central hole of the rotor housing is the central through hole. An impeller is arranged on the upper end face of the rotor housing. A second annular groove is formed on the lower end face of the rotor housing towards the impeller direction. The support ring is installed in the second annular groove, and the support ring is pressed by the cover plate installed on the rotor housing. An annular cavity is formed between the inner side wall of the support ring and the inner ring wall of the second annular groove. The second permanent magnet is fixedly installed in the annular cavity. A plurality of fixing grooves are formed on the support ring, and the rotor magnetic steels are installed in the fixing grooves. The plurality of fixing grooves are evenly distributed on the same circumference, and the diameter of the circle where the fixing grooves are located is larger than the diameter of the circle where the second permanent magnet is located; A second magnetic isolation sleeve is also installed on the support ring, and the second magnetic isolation sleeve is located between the second permanent magnet and the rotor magnetic steels; The magnetic bearing assembly includes an annular first stator iron core and a sensor for detecting the change of the magnetic force of the second permanent magnet. A radially inward convex first magnetic pole is arranged on the inner ring of the first stator iron core. The inner side wall of the first magnetic pole is an arc side wall, and the circumference where the inner side wall of the first magnetic pole is located is coaxially arranged with the circumference where the rotor magnetic steels are located. A first coil is installed on the first magnetic pole. An insulating layer is arranged between the first coil and the first magnetic pole. The stator iron core is attached to the outer ring side wall of the first annular groove, and the inner side wall of the first magnetic pole is attached to the inner ring side wall of the first annular groove. The sensor is fixedly installed in the inner cavity of the convex column, and the sensor is located below the first permanent magnet; A magnetic isolation member is provided between the sensor and the first permanent magnet; A fixing member is further installed in the inner cavity of the convex post. The sensor is fixed between the magnetic isolation member and the fixing member by the fixing member. A cushion block is further installed at the bottom of the inner cavity of the convex post. The first permanent magnet abuts against the cushion block; Both the first permanent magnet and the second permanent magnet are multiple and are stacked; 2. The rotor suspension and stable rotation device according to claim 1, wherein: The motor stator assembly includes an annular second stator core. The second stator core is installed at the bottom of the second cavity. A protruding second magnetic pole is provided on the lower end surface of the second stator core. A second coil is installed on the second magnetic pole. An insulating layer is provided between the second coil and the second magnetic pole. In the axial projection plane, the circumference where the second magnetic pole is located is within the movement track of the rotor magnet; 3. A rotor suspension and stable rotation device according to claim 2, characterized in that: The cavity of the second cavity is provided with a downward protruding convex ring. A first magnetic isolation sleeve is sleeved on the convex ring. The first magnetic isolation sleeve is located within the inner ring of the motor stator assembly;

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