A magnetic coupling reducer and ventricular auxiliary pump device

Abstract

This application discloses a magnetic coupling reducer and a ventricular assist pump device. The magnetic coupling reducer includes: a housing assembly comprising a front cover and a rear cover, the front cover having a power input port and the rear cover having a power output port; at least one stage of reduction assembly disposed between the front and rear covers, each stage including a support plate and a first rotor and a second rotor disposed on opposite sides of the support plate, the support plate having a plurality of circumferentially distributed magnetic conductors; the first rotor having a plurality of circumferentially distributed first magnetic cores, adjacent first magnetic cores having opposite magnetic pole arrangements, the first rotor adjacent to the rear cover outputting power through the power output port; the second rotor having a plurality of circumferentially distributed second magnetic cores, adjacent second magnetic cores having opposite magnetic pole arrangements, the second rotor adjacent to the front cover receiving power input through the power input / output port; wherein the number of first magnetic cores is greater than the number of magnetic conductors, and the number of magnetic conductors is greater than the number of second magnetic cores. Through the above method, the magnetic coupling reducer provided by this application can reduce wear and noise, has a longer service life, and can avoid conduction of blockages to the connected motor, improving the protection of the motor.

Description

Technical Field

[0001] This application relates to the field of speed reducer technology, and in particular to a magnetic coupling speed reducer and a ventricular auxiliary pump device. Background Technology

[0002] An ideal ventricular assist device (VAD) provides effective circulatory support for high-risk patients with coronary artery disease (CAD) and acute myocardial infarction. For high-risk CAD patients undergoing percutaneous coronary intervention (PCI), the clinical goals of an ideal VAD are to maintain systemic hemodynamic stability while preventing interruption of cardiac output; reduce myocardial ischemia levels to minimize myocardial cell damage; and reduce complications such as bleeding and peripheral embolism. Therefore, an ideal VAD provides systemic hemodynamic support and myocardial protection, while also being safe and convenient.

[0003] The ventricular assist pump device provides systemic hemodynamic support and myocardial protection based on the fundamental principle that it replicates the original function of the heart: pumping blood out of the ventricles, through the aortic valve into the aortic root, from the aortic root through the descending aorta to the whole body, while simultaneously supplying the myocardium through the coronary artery inlet.

[0004] Currently used ventricular assist pump devices typically employ mechanical transmission reducers. Prolonged use of this type of reducer can lead to wear and damage, which in turn can cause the motor to jam and become damaged. During operation, it often generates significant noise and can also become jammed due to the impeller it drives, which can also damage the motor. Summary of the Invention

[0005] This application provides a magnetic coupling reducer and a ventricular auxiliary pump device to solve the problem that motor damage is easily caused by the reducer stalling.

[0006] To solve the above-mentioned technical problems, this application adopts the following technical solution: providing a magnetic coupling reducer. The magnetic coupling reducer includes: a housing assembly including a front cover and a rear cover, the front cover having a power input port and the rear cover having a power output port; at least one stage of reduction assembly disposed between the front cover and the rear cover, each stage of the reduction assembly including a support disk and a first rotor and a second rotor respectively disposed on both sides of the support disk, the support disk having a plurality of circumferentially distributed magnetic conductors; the first rotor having a plurality of circumferentially distributed first magnetic cores, adjacent first magnetic cores having opposite magnetic pole arrangements, the first rotor adjacent to the rear cover outputting power through the power output port; the second rotor having a plurality of circumferentially distributed second magnetic cores, adjacent second magnetic cores having opposite magnetic pole arrangements, the second rotor adjacent to the front cover receiving power input through the power input / output port; wherein, the number of first magnetic cores is greater than the number of magnetic conductors, and the number of magnetic conductors is greater than the number of second magnetic cores.

[0007] In some embodiments, the magnetic coupling reducer includes multiple stages of the reduction assembly, and adjacent first rotors and second rotors are connected by a shaft between two adjacent stages of the reduction assembly.

[0008] In some embodiments, the distance between the connected first rotor and second rotor is greater than or equal to 5.0 mm.

[0009] In some embodiments, the surface area of ​​the first magnetic core is smaller than the surface area of ​​the magnetic conductor, and the surface area of ​​the magnetic conductor is smaller than the surface area of ​​the second magnetic core.

[0010] In some embodiments, the magnetic conductor, the first magnetic core, and the second magnetic core have the same shape, and the shape of the first magnetic core includes circular, rectangular, and sector-shaped.

[0011] In some embodiments, in each stage of the reduction assembly, the distance between the first rotor and the support disk is 0.5 mm to 3.0 mm, and the distance between the support disk and the second rotor is 0.5 mm to 3.0 mm.

[0012] In some embodiments, the outer periphery of the support plate is further provided with a connecting cylinder, the front cover is connected to one end of the adjacent connecting cylinder, and the rear cover is connected to the other end of the adjacent connecting cylinder.

[0013] In some embodiments, the magnetic coupling reducer includes multiple stages of the reduction assembly, with the opposite ends of two adjacent connecting cylinders connected to each other.

[0014] In some embodiments, the first rotor is rotatably connected to the rear cover and the support plate via a ceramic bearing, and the second rotor is rotatably connected to the front cover and the support plate via a ceramic bearing.

[0015] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a ventricular assist pump device. This ventricular assist pump device includes the magnetic coupling reducer described above.

[0016] The beneficial effects of this application are as follows: Unlike existing technologies, this application discloses a magnetic coupling reducer and a ventricular assist pump device. By employing the magnetic coupling reducer provided in this application, the first rotor and the second rotor achieve speed reduction and power transmission through magnetic coupling. There is no direct physical contact between the first rotor and the second rotor, effectively reducing wear and contact noise. Furthermore, if either rotor stalls, the stall will not be transmitted to the other. Therefore, when applied to a ventricular assist pump device, even if the impeller or the first rotor stalls, it will not damage the motor connected to the magnetic coupling reducer, effectively improving the service life of the magnetic coupling reducer and enhancing the protection of the motor. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the ventricular assist pump device provided in this application;

[0019] Figure 2 yes Figure 1 An exploded structural diagram of an embodiment of the magnetic coupling reducer in the ventricular assist pump fluid device shown;

[0020] Figure 3 yes Figure 2 A schematic diagram of the support disk in the magnetic coupling reducer shown.

[0021] Figure 4 yes Figure 2 A schematic diagram of the structure of the first rotor in the magnetic coupling reducer shown;

[0022] Figure 5 yes Figure 2 A schematic diagram of the structure of the second rotor in the magnetic coupling reducer shown;

[0023] Figure 6 yes Figure 1 A schematic diagram of another embodiment of the magnetic coupling reducer in the ventricular assist pump device shown;

[0024] Figure 7 yes Figure 2 or Figure 6 The diagram shows various shapes and structures of the magnetic conductor, the first magnetic core, and the second magnetic core in the magnetic coupling reducer. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] This application provides a ventricular assist pump device 200, see reference. Figure 1 , Figure 1 This is a schematic diagram of an embodiment of the ventricular assist device provided in this application.

[0029] The ventricular assist pump device 200 is a medical device product that assists the left ventricle in transporting blood to the aorta. In this embodiment, the motor 204 of the ventricular assist pump device 200 is externally mounted during use to avoid the problem of hemolysis caused by the internal motor.

[0030] The ventricular assist device 200 includes an impeller end 201, an outer tube 202, a flexible drive shaft 203, a magnetically coupled reducer 100, and a motor 204. The ventricular assist pumping device 200 drives the reducer 100 via the external motor 204. The flexible drive shaft 203 is located inside the outer tube 202, and its two ends are connected to the impeller end 201 and the reducer 100, respectively. When the ventricular assist pumping device 200 delivers blood to the appropriate position on the heart, the external motor 204 rotates, driving the reducer 100. The reducer 100, in turn, rotates, causing the impeller end 201 connected to the flexible drive shaft 203 to rotate, thereby achieving the pumping function.

[0031] Compared to traditional mechanical gear reducers, the reducer 100 in this application uses magnetic coupling to achieve the corresponding reduction ratio, which can have low noise, low wear, and no damage to the motor 204 when stalled, and can have a longer service life.

[0032] See Figures 2 to 5 , Figure 2 Is it like this? Figure 1 The diagram shown is a structural schematic of one embodiment of the magnetic coupling reducer in the ventricular assist device. Figure 3 yes Figure 2 The diagram shows the structure of the support disc in the magnetic coupling reducer. Figure 4 yes Figure 2 The diagram shows the structure of the first rotor in the magnetically coupled reducer. Figure 5 yes Figure 2 The diagram shows the structure of the second rotor in the magnetic coupling reducer.

[0033] The magnetic coupling reducer 100 includes a housing assembly 10 and at least one stage reduction assembly 20. The housing assembly 10 includes a front cover 12 and a rear cover 14. The front cover 12 has a power input hole 120, which can be connected to a motor 204 as described above to receive power input. The rear cover 14 has a power output hole 140, which is used to output power outward, for example, it can be connected to the flexible drive shaft 203 as described above. At least one stage reduction assembly 20 is disposed between the front cover 12 and the rear cover 14. Each stage reduction assembly 20 includes a support plate 21 and a first rotor 22 and a second rotor 23 respectively disposed on both sides of the support plate 21. The disk 21 is provided with a plurality of magnetic conductors 212 distributed circumferentially; the first rotor 22 is provided with a plurality of first magnetic cores 222 distributed circumferentially, the magnetic poles of adjacent first magnetic cores 222 are arranged oppositely, and the first rotor 22 near the rear cover 14 outputs power outward through the power output hole 140; the second rotor 23 is provided with a plurality of second magnetic cores 232 distributed circumferentially, the magnetic poles of adjacent second magnetic cores 232 are arranged oppositely, and the second rotor 23 near the front cover 12 receives power input through the power input outlet hole 120; wherein, the number of first magnetic cores 222 is greater than the number of magnetic conductors 212, and the number of magnetic conductors 212 is greater than the number of second magnetic cores 232.

[0034] The first magnetic core 222 has relative N and S poles. The magnetic poles of two adjacent first magnetic cores 222 are arranged in opposite directions, that is, the N and S poles of two adjacent first magnetic cores 222 are arranged in opposite directions. When the first rotor 22 rotates, the support disk 21 is relatively fixed and will sequentially magnetize the magnetic conductors 212 that are gradually corresponding to it, so that the magnetic poles of each magnetic conductor 212 rotate in opposite directions. Then, magnetic coupling and conduction can be carried out by means of the difference in the number of magnetic conductors 212, thereby driving the second rotor 23 to rotate in the opposite direction. The N and S poles of two adjacent second magnetic cores 232 on the second rotor 23 are also arranged in opposite directions.

[0035] When the first rotor 22 acts as the active rotor receiving power input and the second rotor 23 acts as the driven rotor, the rotational speed will be amplified, i.e., accelerated, so that the second rotor 23 outputs power at a higher speed. Similarly, when the second rotor 23 acts as the active rotor receiving power input and the first rotor 22 acts as the driven rotor, the rotational speed will be reduced, i.e. decelerated, so that the first rotor 22 outputs power at a lower speed.

[0036] In this embodiment, the magnetic coupling reducer 100 uses the second rotor 23 as the driving rotor and the first rotor 22 as the driven rotor to achieve speed reduction output.

[0037] Specifically, in each stage of the deceleration assembly 20, the support disk 21, the first rotor 22, and the second rotor 23 are all made of non-magnetic materials, the magnetic conductor 212 is made of magnetically conductive materials, and the first magnetic core 222 and the second magnetic core 232 are both magnets; the support disk 21, the first rotor 22, and the second rotor 23 are arranged coaxially, and the magnetic conductor 212, the first magnetic core 222, and the second magnetic core 232 are all evenly distributed circumferentially.

[0038] When the second rotor 23 is driven to rotate, the second magnetic core 232 on it rotates accordingly. The magnetic poles of the magnetic conductor 212 change in the opposite direction. When the number of magnetic poles of the magnetic conductor 212 near the end of the first rotor 22 is the same as the number of the first magnetic cores 222 on the first rotor 22, a magnetic coupling phenomenon occurs, causing the first rotor 22 to rotate in the opposite direction. The rotation of the second rotor 23 is opposite to the rotation direction of the first rotor 22. The continuous change of magnetic poles of the magnetic conductor 212 will continuously generate magnetic coupling with the first magnetic cores 222 on the first rotor 22, so that the first rotor 22 can rotate continuously. The first rotor 22 can decelerate and output power, for example, it can drive the aforementioned flexible transmission shaft 203 and impeller end 201 to act, thereby realizing the blood pumping function.

[0039] Optionally, in the first-stage reduction assembly 20, there are 4 second magnetic cores 232, 10 magnetic conductors 212, and 16 first magnetic cores 222. Then the reduction ratio of the reduction assembly 20 is 4:1, that is, the second rotor 23 will drive the first rotor 22 to rotate once for four rotations, achieving a four-fold reduction ratio.

[0040] Optionally, in the first-stage reduction assembly 20, the number of second magnetic cores 232 is 4, the number of magnetic conductors 212 is 12, and the number of first magnetic cores 222 is 20. Then the reduction ratio of the reduction assembly 20 is 5:1, that is, the second rotor 23 will drive the first rotor 22 to rotate once for five rotations, achieving a five-fold reduction ratio.

[0041] Optionally, in the first-stage reduction assembly 20, there are 4 second magnetic cores 232, 14 magnetic conductors 212, and 14 first magnetic cores 222. Then the reduction ratio of the reduction assembly 20 is 6:1, that is, the second rotor 23 will drive the first rotor 22 to rotate once for six rotations, achieving a reduction ratio of six times.

[0042] In each stage of the reduction gear assembly 20, the surface area of ​​the first magnetic core 222 is smaller than that of the magnetic conductor 212, and the surface area of ​​the magnetic conductor 212 is smaller than that of the second magnetic core 232. For example, if the surface shapes of the first magnetic core 222, the magnetic conductor 212, and the second magnetic core 232 are circular, then the diameter of the second magnetic core 232 is the largest, the diameter of the magnetic conductor 212 is the second largest, and the diameter of the first magnetic core 222 is the smallest. On the one hand, the difference in the number of the second magnetic core 232, the magnetic conductor 212, and the first magnetic core 222 facilitates their respective distribution. On the other hand, by constructing such a difference in surface area, it can help the second magnetic core 232 achieve more reliable and efficient magnetic coupling with the first magnetic core 222 through the magnetic conductor 212, resulting in higher transmission efficiency of the magnetic coupling reducer 100.

[0043] See Figures 3 to 5 and Figure 7 , Figure 7 yes Figure 2 or Figure 6 The diagram shows various shapes and structures of the magnetic conductor, the first magnetic core, and the second magnetic core in the magnetic coupling reducer.

[0044] In this embodiment, the magnetic conductor 212, the first magnetic core 222 and the second magnetic core 232 have the same shape. The shape of the first magnetic core 222 includes a circle, a rectangle and a sector, that is, the shape of the first magnetic core 222 can be any one of a circle, a rectangle and a sector.

[0045] In contrast to the case where the shapes of the magnetic conductor 212, the first magnetic core 222, and the second magnetic core 232 are circular, such as Figure 7 When the magnetic conductor 212, the first magnetic core 222 and the second magnetic core 232 shown are rectangular or fan-shaped, the contact area of ​​the magnetic poles during transmission can be increased, energy loss can be reduced and the transmission torque can be improved.

[0046] When the magnetic conductor 212, the first magnetic core 222 and the second magnetic core 232 are circular, the diameter of the magnetic conductor 212, the first magnetic core 222 and the second magnetic core 232 is between 2mm and 10mm, which can effectively balance miniaturization and transmission efficiency.

[0047] Furthermore, in each stage of the reduction gear assembly 20, the distance between the first rotor 22 and the support disk 21 is 0.5mm to 3.0mm, for example, the distance between the first rotor 22 and the support disk 21 is 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.3mm, 2.5mm, 2.8mm, or 3.0mm; the distance between the support disk 21 and the second rotor 23 is 0.5mm to 3.0mm, and the distance between the support disk 21 and the second rotor 23 is 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.3mm, 2.5mm, 2.8mm, or 3.0mm. Within this range of values, a reliable and efficient coupling relationship can be achieved, resulting in higher efficiency of the reduction transmission.

[0048] The reduction gear assembly 20 is provided with at least one stage, and multiple stages of the reduction gear assembly 20 are connected to each other to form a multi-stage reduction, thereby achieving a larger reduction ratio. For example, as Figure 2 As shown, the magnetic coupling reducer 100 includes a first-stage reduction assembly 20, thus having a first-stage reduction ratio; or, see [reference needed]. Figure 6 The magnetic coupling reducer 100 includes a two-stage reduction component 20. Two first-stage reduction components 20 are coupled together to form a second-stage reduction component 20, which has a larger second-stage reduction ratio, which is the product of the two first-stage reduction ratios; or, the magnetic coupling reducer 100 may include a three-stage reduction component 20 formed by coupling three first-stage reduction components 20, etc.

[0049] When the magnetic coupling reducer 100 includes a multi-stage reduction assembly 20, the reduction ratio of each stage reduction assembly 20 can be the same or different. The reduction ratio of each stage reduction assembly 20 is determined by the ratio of the number of the first magnetic core 222 to the number of the second magnetic core 232.

[0050] In the magnetic coupling reducer 100, the overall reduction ratio of the magnetic coupling reducer 100 can be flexibly adjusted by changing the number of stages of the reduction components 20. That is, the multi-stage reduction components 20 can be connected to each other in a detachable manner, and their number can be flexibly adjusted during use, thereby changing the overall reduction ratio of the magnetic coupling reducer 100.

[0051] See Figure 6 When the magnetic coupling reducer 100 includes a multi-stage reduction assembly 20, the adjacent first rotor 22 and second rotor 23 of two adjacent reduction assemblies 20 are connected by a shaft and spaced apart from each other, so that the adjacent first rotor 22 drives the second rotor 23 to rotate. In the same stage reduction assembly 20, the second rotor 23 drives the first rotor 22 to rotate in the opposite direction through magnetic coupling, so as to realize multi-stage coupling reduction transmission.

[0052] Among them, the distance between the first rotor 22 and the second rotor 23 connected to each other in the two adjacent reduction gear components 20 is greater than or equal to 5.0 mm, so as to avoid the magnetic fields between the adjacent first rotor 22 and second rotor 23 causing significant interference to each other by increasing the appropriate distance.

[0053] In one embodiment, such as Figure 2 As shown, the magnetic coupling reducer 100 includes a first-stage reduction assembly 20. A first rotor 22 is rotatably disposed between a support disk 21 and a rear cover 14, and a second rotor 23 is rotatably disposed between a support disk 21 and a front cover 12. The first rotor 22 is rotatably connected to the rear cover 14 and the support disk 21 via a bearing, and the second rotor 23 is rotatably connected to the front cover 12 and the support disk 21 via a bearing. The bearing is a ceramic bearing, which has better wear resistance and helps to improve the service life of the magnetic coupling reducer 100.

[0054] The first rotor 22 and the support plate 21, as well as the second rotor 23 and the support plate 21, are rotatably connected by a shaft and bearing. The front cover 12 is provided with a ceramic bearing, and the end of the second rotor 23 facing the front cover 12 is provided with a shaft, which cooperates with the ceramic bearing of the front cover 12. This shaft is used to receive power input. The end of the first rotor 22 facing the rear cover 14 is also provided with a shaft, which cooperates with the ceramic bearing on the rear cover 14. This shaft is used to output power.

[0055] The outer periphery of the support plate 21 is also provided with a connecting cylinder 214. The front cover 12 is connected to one end of the adjacent connecting cylinder 214, and the rear cover 14 is connected to the other end of the adjacent connecting cylinder 214. The front cover 12 can be fastened or screwed to one end of the connecting cylinder 214, and the rear cover 14 can be fastened or screwed to the other end of the connecting cylinder 214, thereby forming a complete magnetic coupling reducer 100.

[0056] Furthermore, when the magnetic coupling reducer 100 includes a multi-stage reduction assembly 20, the two opposite ends of two adjacent connecting cylinders 214 are connected to each other, for example, by snap-fit ​​or screw connection.

[0057] In another embodiment, such as Figure 7 As shown, the magnetic coupling reducer 100 includes a two-stage reduction assembly 20. The two ends of the connecting cylinders 214 on the two support discs 21 are connected to each other, and the front cover 12 is connected to one end of the adjacent connecting cylinder 214, and the rear cover 14 is connected to the other end of the adjacent connecting cylinder 214. The adjacent first rotor 22 and second rotor 23 of the two-stage reduction assembly 20 are connected by a shaft, thereby realizing a secondary reduction transmission between the second rotor 23 and the first rotor 21, thus forming a two-stage reduction system.

[0058] As can be seen, when three or four levels of deceleration are required, the number of deceleration components 20 can be increased, and the connection between adjacent deceleration components 20 is also very convenient.

[0059] Unlike existing technologies, this application discloses a magnetic coupling reducer and a ventricular assist pump device. By employing the magnetic coupling reducer provided in this application, the first rotor and the second rotor achieve speed reduction and power transmission through magnetic coupling. There is no direct physical contact between the first rotor and the second rotor, effectively reducing wear and contact noise. Furthermore, if either rotor stalls, the stall will not be transmitted to the other. Therefore, when applied to a ventricular assist pump device, even if the impeller or the first rotor stalls, it will not damage the motor connected to the magnetic coupling reducer, effectively improving the service life of the magnetic coupling reducer and enhancing the protection of the motor.

[0060] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A magnetically coupled speed reducer, characterized in that, include: The housing assembly includes a front cover and a rear cover, wherein the front cover has a power input port and the rear cover has a power output port; At least one stage of deceleration assembly is disposed between the front cover and the rear cover. Each stage of the deceleration assembly includes a support disk and a first rotor and a second rotor disposed on both sides of the support disk. The support disk has a plurality of magnetic conductors distributed circumferentially. The first rotor has a plurality of first magnetic cores distributed circumferentially, with the magnetic poles of adjacent first magnetic cores arranged in opposite directions. The first rotor adjacent to the rear cover outputs power through the power output hole. The second rotor has a plurality of second magnetic cores distributed circumferentially, with the magnetic poles of adjacent second magnetic cores arranged in opposite directions. The second rotor adjacent to the front cover receives power input through the power input hole. A connecting cylinder is also provided on the outer periphery of the support disk. The front cover is connected to one end of the adjacent connecting cylinder, and the rear cover is connected to the other end of the adjacent connecting cylinder. Wherein, the number of the first magnetic cores is greater than the number of the magnetic conductors, and the number of the magnetic conductors is greater than the number of the second magnetic cores; the surface area of ​​the first magnetic core is smaller than the surface area of ​​the magnetic conductors, and the surface area of ​​the magnetic conductors is smaller than the surface area of ​​the second magnetic cores.

2. The magnetically coupled reducer according to claim 1, characterized in that, The magnetic coupling reducer includes multiple stages of the reduction assembly, and adjacent first rotors and second rotors are connected by a shaft between two adjacent stages of the reduction assembly.

3. The magnetically coupled reducer according to claim 2, characterized in that, The distance between the first rotor and the second rotor that are connected is greater than or equal to 5.0 mm.

4. The magnetically coupled reducer according to claim 1, characterized in that, The magnetic conductor, the first magnetic core, and the second magnetic core have the same shape, and the shape of the first magnetic core includes circular, rectangular, and sector-shaped.

5. The magnetically coupled reducer according to claim 1, characterized in that, In each stage of the reduction assembly, the distance between the first rotor and the support plate is 0.5 mm to 3.0 mm, and the distance between the support plate and the second rotor is 0.5 mm to 3.0 mm.

6. The magnetically coupled reducer according to claim 1, characterized in that, The magnetic coupling reducer includes multiple stages of the reduction assembly, and the two opposite ends of two adjacent connecting cylinders are connected to each other.

7. The magnetically coupled reducer according to claim 1, characterized in that, The first rotor is rotatably connected to the rear cover and the support plate via a ceramic bearing, and the second rotor is rotatably connected to the front cover and the support plate via a ceramic bearing.

8. A ventricular assist pump device, characterized in that, The ventricular assist pump device includes a magnetically coupled reducer as described in any one of claims 1 to 7.

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