A magnetically coupled sealed intervention pump

Abstract

This invention belongs to the field of medical device technology and discloses a magnetically coupled sealed interventional pump, which includes a motor, a first support base, an active magnetic ring, a driven magnetic ring, an impeller, and a first connecting shaft. The first support base is sealed and fixed to the outer wall of the motor to form a first assembly cavity. The output shaft and the active magnetic ring are coaxially fixed and sealed within the first assembly cavity, and the output shaft rotates to drive the active magnetic ring to rotate synchronously. The bottom of the first connecting shaft is fixed to the first support base, and the impeller is rotatably connected to the first connecting shaft. The driven magnetic ring is fixed to the lower end of the impeller, and the magnetic torque generated by its coupling with the active magnetic ring drives the impeller to rotate synchronously. This invention transmits the rotation of the motor output shaft to the impeller through magnetic coupling transmission between the active and driven magnetic rings, eliminating the need for a direct mechanical connection and sealing structure between the motor output shaft and the impeller. This avoids the leakage problems that may occur due to mechanical seals in traditional pumps, improving the sealing performance and reliability of the interventional pump.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a magnetically coupled sealed interventional pump. Background Technology

[0002] Interventional pumps, as an important medical device, play a key role in cardiovascular surgery and long-term cardiac support therapy. Their core function is to mechanically assist or replace the heart's pumping function, ensuring stable and continuous blood circulation. They have an irreplaceable role in the treatment of serious heart diseases such as heart failure.

[0003] Interventional pumps primarily rely on an electric motor as a power source to drive the pump body and deliver blood. Due to the special working environment of interventional pumps, which typically involve direct contact with human blood, the sealing performance of the motor faces extremely high challenges. If the motor seal is inadequate, components from the blood may seep into the motor, causing short circuits, damage, or even serious medical accidents. Currently, the industry mainly uses two common methods for motor sealing: liquid medium injection sealing and traditional sealing rings.

[0004] Liquid perfusion sealing works by continuously supplying a liquid medium into the motor, using the pressure and flow of the liquid to form a barrier that prevents blood from seeping into the motor from the shaft end. While this method offers some sealing, it also has the following drawbacks: the complex perfusion control system increases the overall complexity and cost of the equipment; instability in the perfusion flow rate can indirectly affect the stability of the pumped blood flow, thus impacting treatment effectiveness; furthermore, although the perfusion fluid itself flows from the motor tail end to the motor shaft end, ensuring continuous high pressure inside the motor for sealing, the direct discharge of the perfusion fluid into the patient's body may introduce particulate contaminants, increasing the risk of stroke, and the anticoagulants such as heparin often contained in the perfusion fluid may interfere with the patient's electrolyte balance, posing additional health risks.

[0005] Traditional sealing rings are placed at the front end of the motor to physically prevent blood from entering the motor. While this method is effective initially, it has several drawbacks: as the motor shaft continues to rotate, the sealing ring inevitably wears down, leading to a decrease in sealing performance; furthermore, particles generated during wear may enter the body, causing long-term harm to the patient's health. Even with sealing rings made of ultra-wear-resistant materials, their lifespan is relatively limited, making it difficult to meet the needs of long-term treatment, thus restricting the applicability and therapeutic effects of interventional pumps.

[0006] Based on the above analysis, although the existing sealing methods for interventional pump motors can meet the basic usage requirements to a certain extent, they all have their own defects and shortcomings, and the overall sealing performance and reliability are relatively poor. Summary of the Invention

[0007] The purpose of this invention is to provide a magnetically coupled sealed intervention pump, which has a simple structure, good sealing performance and reliability, and strong practicality.

[0008] The technical solution adopted by the present invention to solve its technical problem is: a magnetically coupled sealed intervention pump, including a motor, a first support base, an active magnetic ring, a driven magnetic ring, an impeller and a first connecting shaft, wherein the first support base is sealed and fixed to the outer wall of the motor to form a first assembly cavity; the output shaft of the motor and the active magnetic ring are coaxially fixed and both are sealed in the first assembly cavity, and the output shaft drives the active magnetic ring to rotate synchronously.

[0009] The bottom of the first connecting shaft is fixed on the first support base. The impeller is located above the first support base and is rotatably connected to the first connecting shaft. The driven magnetic ring is fixed at the lower end of the impeller and drives the impeller to rotate synchronously through the magnetic torque generated by its coupling with the active magnetic ring.

[0010] The working principle of the magnetically coupled sealed intervention pump of the present invention is as follows: After the motor starts, its output shaft rotates. Since the output shaft of the motor and the active magnetic ring are coaxially fixed and sealed in the first assembly cavity of the first support, the rotation of the output shaft will drive the active magnetic ring to rotate synchronously. The impeller is located above the first support and is rotatably connected to the first connecting shaft, allowing the impeller to rotate freely around the first connecting shaft as the center of rotation. At the same time, the driven magnetic ring is fixed at the lower end of the impeller. The active magnetic ring and the driven magnetic ring generate a magnetic torque through coupling. The magnetic torque will drive the driven magnetic ring to rotate synchronously, thereby driving the impeller to rotate synchronously, realizing the fluid transportation function of the pump.

[0011] Furthermore, it also includes a flow path outlet pipe, a support pipe, a second support base, and a second connecting shaft; the upper and lower ends of the flow path outlet pipe are fixedly connected to the support pipe and the first support base, respectively, and the impeller and the second support base are both located inside the flow path outlet pipe; the second support base is located above the impeller and is fixedly connected to the flow path outlet pipe, and the impeller is rotatably connected to the second support base through the second connecting shaft;

[0012] The second support is provided with a liquid through hole, and the lower part of the outlet pipe is provided with a liquid outlet. The circulating liquid is input from the upper end of the support pipe, flows through the liquid through hole, is conveyed by the impeller, and then flows out from the liquid outlet.

[0013] Furthermore, it also includes a ceramic protective sleeve and an impeller base. The impeller base is located below the driven magnetic ring, and the ceramic protective sleeve is located in the inner hole of the driven magnetic ring and is fixedly connected to the driven magnetic ring. Its lower end is fixedly connected to the impeller base.

[0014] Furthermore, the impeller includes a hub, blades, and a mounting base. The hub is fixed to the top of the mounting base, and the blades are fixed to the outer periphery of the hub. A second assembly cavity is provided on the mounting base, and the driven magnetic ring is disposed in the second assembly cavity.

[0015] Furthermore, a first through hole is provided inside the ceramic protective sleeve, and a second through hole communicating with the first through hole is provided on the impeller base, and a guide hole communicating with the first through hole is provided on the mounting base; the guide hole, the first through hole and the second through hole form an auxiliary channel, and the liquid enters from the guide hole and flows through the first through hole and the second through hole in sequence, and then flows out from the gap between the impeller base and the first support base.

[0016] Furthermore, the first connecting shaft has a columnar structure, with its lower end fixed on the first support base and its upper end suspended inside the ceramic protective sleeve and fitted with the ceramic protective sleeve with a clearance.

[0017] Furthermore, the first connecting shaft is a block structure with a placement groove on its top, the lower end of the impeller base is placed in the placement groove, and an embedding through hole is also provided in the center of the placement groove; the top of the first support base is provided with an embedding protrusion that matches the embedding through hole.

[0018] Furthermore, a flow guide groove is provided on the embedded protrusion; a support protrusion is provided at the bottom of the first connecting shaft, so that a flow gap is formed between the first connecting shaft and the first support seat.

[0019] Furthermore, it also includes a bushing, the lower end of which is fixedly sleeved on the output shaft, and the upper end is placed in the inner hole of the active magnetic ring and fixedly connected to the active magnetic ring.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. This invention transmits the rotation of the motor output shaft to the impeller through magnetic coupling transmission between the active and driven magnetic rings. This eliminates the need for a direct mechanical connection and sealing structure between the motor output shaft and the impeller, avoiding leakage problems that may occur in traditional pumps due to mechanical seals, and improving the sealing performance and reliability of the pump. Magnetic coupling transmission eliminates contact wear, avoiding particulate contamination caused by friction in traditional mechanical seals. At the same time, it reduces the risk of damage to the power source of the traditional drive shaft due to overload.

[0022] 2. This invention forms an auxiliary channel by opening corresponding through holes in the ceramic protective sleeve, impeller base and mounting base, so that the liquid can form a continuous flow path in the channel, avoiding blood stagnation in a certain area for a long time, thereby reducing the risk of thrombosis; at the same time, it reduces the temperature of the driven magnetic ring and surrounding components during the flow process, preventing the components from deteriorating, deforming or being damaged due to excessive temperature, and ensuring that the interventional pump operates stably in a suitable temperature environment.

[0023] 3. This invention adopts a non-perfusion control system, which simplifies the entire system. Compared with interventional blood pumps that use sealing rings, this invention not only significantly reduces particle release, but also has a longer stable operating time, making it more applicable and practical. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0025] Figure 1 This is a schematic diagram of an exploded structure according to Embodiment 1 of the present invention.

[0026] Figure 2 This is a schematic diagram of the main view structure of Embodiment 1 of the present invention.

[0027] Figure 3 It is along Figure 2 A structural schematic diagram shown in cross-section of plane AA.

[0028] Figure 4 yes Figure 3 A partially enlarged schematic diagram.

[0029] Figure 5 A schematic diagram of the fit between the first support base and the first connecting shaft in Embodiment 1 of the present invention.

[0030] Figure 6 This is a schematic diagram of one structure of the impeller of the present invention.

[0031] Figure 7 This is a schematic diagram of the structure of the second support base of the present invention.

[0032] Figure 8 This is a schematic diagram of an exploded structure according to Embodiment 2 of the present invention.

[0033] Figure 9 This is a schematic diagram of the main view structure of Embodiment 2 of the present invention.

[0034] Figure 10 It is along Figure 9 A structural schematic diagram of a cross-section of the BB plane.

[0035] Figure 11 yes Figure 10 A partially enlarged schematic diagram.

[0036] Figure 12 A schematic diagram of a structure of the first support base in Embodiment 2 of the present invention.

[0037] Figure 13 A schematic diagram of a structure of the first connecting shaft in Embodiment 2 of the present invention.

[0038] Figure 14 yes Figure 13 A structural diagram from another perspective.

[0039] Figure 15 A three-dimensional structural diagram of the first support base and the first connecting shaft cooperating in Embodiment 2 of the present invention.

[0040] Figure 16 A schematic diagram of the main structure of the first support base and the first connecting shaft in Embodiment 2 of the present invention.

[0041] Figure 17 A top view of the structure of the first support base and the first connecting shaft in Embodiment 2 of the present invention.

[0042] In the diagram: 1. Motor; 2. First support base; 3. Second support base; 4. Active magnetic ring; 5. Driven magnetic ring; 6. Impeller; 7. First connecting shaft; 8. Second connecting shaft; 9. First assembly cavity; 10. Second assembly cavity; 11. Output shaft; 12. Flow path outlet pipe; 13. Support pipe; 14. Liquid through hole; 15. Liquid outlet; 16. Ceramic protective sleeve; 17. Impeller base; 18. First through hole; 19. Second through hole; 20. Guide hole; 21. Placement groove; 22. Embedded through hole; 23. Embedded protrusion; 24. Guide groove; 25. Support protrusion; 26. Flow gap; 27. Bushing; 28. Bracket; 29. ​​Bearing; 30. Mounting boss; 31. Mounting groove; 32. First back iron; 33. Second back iron;

[0043] 601. Hub; 602. Blade; 603. Mounting bracket. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0045] Example 1

[0046] like Figures 1 to 7As shown, a magnetically coupled sealed intervention pump includes a motor 1, a first support base 2, an active magnetic ring 4, a driven magnetic ring 5, an impeller 6, and a first connecting shaft 7. The first support base 2 is sealed and fixed to the outer wall of the motor 1, forming a first assembly cavity 9. The output shaft 11 of the motor 1 is coaxially fixed to the active magnetic ring 4 and both are sealed within the first assembly cavity 9. Rotation of the output shaft 11 drives the active magnetic ring 4 to rotate synchronously. The bottom of the first connecting shaft 7 is fixed to the first support base 2. The impeller 6 is located above the first support base 2 and rotatably connected to the first connecting shaft 7. The driven magnetic ring 5 is fixed to the lower end of the impeller 6 and drives the impeller 6 to rotate synchronously through the magnetic torque generated by its coupling with the active magnetic ring 4. The pump also includes a bushing 27, the lower end of which is fixedly sleeved on the output shaft 11, and the upper end which is placed in the inner hole of the active magnetic ring 4 and fixedly connected to it.

[0047] The working principle of the magnetically coupled sealed intervention pump in this embodiment is as follows: After the motor 1 starts, its output shaft 11 rotates. Since the output shaft 11 of the motor 1 is coaxially fixed and sealed within the first assembly cavity 9 of the first support 2, the rotation of the output shaft 11 will drive the active magnetic ring 4 to rotate synchronously. The lower end of the bushing 27 is fixedly sleeved on the output shaft 11, and the upper end is placed in the inner hole of the active magnetic ring 4 and fixedly connected to the active magnetic ring 4, which further stabilizes the connection and transmission. The impeller 6 is located above the first support 2 and is rotatably connected to the first connecting shaft 7, allowing the impeller 6 to rotate freely around the first connecting shaft 7 as the center of rotation. At the same time, the driven magnetic ring 5 is fixed at the lower end of the impeller 6. The active magnetic ring 4 and the driven magnetic ring 5 generate a magnetic torque through coupling. The magnetic torque will drive the driven magnetic ring 5 to rotate synchronously, thereby driving the impeller 6 to rotate synchronously, realizing the fluid transport function of the pump.

[0048] This embodiment transmits the rotation of the motor 1 output shaft 11 to the impeller 6 through magnetic coupling transmission between the active magnetic ring 4 and the driven magnetic ring 5, eliminating the need for a direct mechanical connection and sealing structure between the motor 1 output shaft 11 and the impeller 6. This structure avoids the leakage problems that may occur in traditional pumps due to mechanical seals, improving the sealing performance and reliability of the pump. In practical use, the active magnetic ring 4 and the driven magnetic ring 5 are made of common materials, such as neodymium iron boron, ferrite, and bonded magnets, as long as they can achieve the function of this embodiment; neodymium iron boron is preferred.

[0049] This embodiment employs a non-perfusion design. Compared to existing perfusion interventional blood pumps, this embodiment simplifies the entire system by eliminating the perfusion control system; and compared to interventional blood pumps using sealing rings, this embodiment not only significantly reduces microparticle release but also extends the system's stable operating time, thereby increasing its applicability.

[0050] like Figures 1 to 4As shown, this embodiment also includes a flow path outlet pipe 12, a support pipe 13, a second support seat 3, and a second connecting shaft 8. The upper and lower ends of the flow path outlet pipe 12 are fixedly connected to the support pipe 13 and the first support seat 2, respectively. The impeller 6 and the second support seat 3 are both disposed inside the flow path outlet pipe 12. The second support seat 3 is located above the impeller 6 and is fixedly connected to the flow path outlet pipe 12. The impeller 6 is rotatably connected to the second support seat 3 through the second connecting shaft 8. A liquid through hole 14 is provided on the second support seat 3, and a liquid outlet 15 is provided on the lower part of the pipe wall of the flow path outlet pipe 12. Circulating liquid (in this invention, "circulating liquid" is "blood" in a medical setting) is input from the upper end of the support pipe 13, flows through the liquid through hole 14, is transported by the impeller 6, and then flows out from the liquid outlet 15. In actual design, the second support 3 can be fixedly connected only to the flow path outlet pipe 12, or only to the support pipe 13, or the upper part can be fixed to the support pipe 13 and the lower part can be fixedly connected to the flow path outlet pipe 12 (i.e., the junction of the support pipe 13 and the flow path outlet pipe 12). The specific choice needs to be made according to actual needs.

[0051] The circulating liquid enters from the upper end of the support pipe 13 and enters the flow path outlet pipe 12 connected to the support pipe 13. Since the second support base 3 is fixed inside the flow path outlet pipe 12 and located above the impeller 6, its liquid through-holes 14 allow the liquid to pass through. The circulating liquid flows through these liquid through-holes 14 and reaches the impeller 6. Driven by the driven magnetic ring 5, the impeller 6 is rotatably connected to the second support base 3 via the second connecting shaft 8. A bearing 29 is installed between the second support base 3 and the second connecting shaft 8, allowing the impeller 6 to rotate flexibly around the second connecting shaft 8 under the impact of the circulating liquid or its own power, accelerating the liquid transport. Finally, the liquid transported by the impeller 6 flows out from the liquid outlet 15 opened on the lower wall of the flow path outlet pipe 12, completing the liquid circulation transport process. Figure 4 As shown (the arrows in the diagram represent the direction of liquid flow).

[0052] In this embodiment, the upper end of the support tube 13 is also provided with two or more supports 28, which are evenly distributed on the support tube 13. This method enhances the support stability of the entire device, reduces device shaking and vibration caused by liquid flow or external factors, and helps to extend the service life of the device. In a preferred embodiment of this embodiment, the number of supports is three.

[0053] In this embodiment, a ceramic protective sleeve 16 and an impeller base 17 are also included. The impeller base 17 is disposed below the driven magnetic ring 5. The ceramic protective sleeve 16 is disposed in the inner hole of the driven magnetic ring 5 and is fixedly connected to the driven magnetic ring 5, with its lower end fixedly connected to the impeller base 17. The impeller 6 includes a hub 601, blades 602, and a mounting base 603. The hub 601 is fixed to the top of the mounting base 603, and the blades 602 are fixed to the outer periphery of the hub 601. A second assembly cavity 10 is provided on the mounting base 603, and the driven magnetic ring 5 is disposed in the second assembly cavity 10. The ceramic protective sleeve 16 has a first through hole 18 inside, and the impeller base 17 has a second through hole 19 communicating with the first through hole 18. The mounting base 603 has a guide hole 20 communicating with the first through hole 18. The guide hole 20, the first through hole 18, and the second through hole 19 form an auxiliary channel. After entering through the guide hole 20, the liquid flows through the first through hole 18 and the second through hole 19 in sequence, and then flows out from the gap between the impeller base 17 and the first support base 2, as detailed below. Figure 4 As shown (the arrows in the diagram represent the direction of liquid flow).

[0054] The impeller base 17 is positioned below the driven magnetic ring 5, providing bottom support and positioning for the driven magnetic ring 5. The ceramic protective sleeve 16 in this embodiment has excellent wear resistance, corrosion resistance, and insulation properties. Its placement within the inner hole of the driven magnetic ring 5 effectively prevents impurities and particles in the liquid from wearing and corroding the inner hole of the driven magnetic ring 5, protecting its normal structure and performance. The mounting base 603 has a second assembly cavity 10, in which the driven magnetic ring 5 is fixedly mounted, enabling the assembly of the impeller 6 and the driven magnetic ring 5, allowing the driven magnetic ring 5 to drive the impeller 6 to rotate. When the intervention pump is operating, the liquid enters the auxiliary channel through the guide hole 20, flows sequentially through the first through hole 18 and the second through hole 19, and finally flows out from the gap between the impeller base 17 and the first support base 2.

[0055] In this embodiment, auxiliary channels are formed by creating corresponding through holes in the ceramic protective sleeve 16, impeller base 17, and mounting base 603, allowing liquid to flow within these channels. Firstly, the design of the auxiliary channels ensures continuous liquid flow. In traditional pump structures, there may be areas where blood flow is slow or almost nonexistent due to hydrodynamic characteristics; these areas are called "dead zones." Within dead zones, blood is prone to clotting and forming thrombi, which is extremely dangerous for patients because thrombi can detach and travel through the bloodstream to vital organs, causing serious consequences such as embolism. In this embodiment, the auxiliary channel design allows the liquid to form a continuous flow path within the pump body, preventing blood from stagnating in a certain area for extended periods, thereby reducing the risk of thrombosis. Secondly, the flowing liquid absorbs and carries away the heat generated by the driven magnetic ring 5 during operation, thus reducing the temperature of the driven magnetic ring 5 and surrounding components. This prevents performance degradation, deformation, or damage due to excessive temperature, ensuring stable operation of the interventional pump within a suitable temperature environment.

[0056] In this embodiment, the first connecting shaft 7 is a columnar structure, with its lower end fixed to the first support 2 and its upper end suspended inside the ceramic protective sleeve 16 and clearance-fitted with the ceramic protective sleeve 16. To further ensure that the liquid can flow smoothly out of the auxiliary channel, in this embodiment, one or more flow grooves are also formed on the surface of the first connecting shaft 7 along the axial direction.

[0057] In this embodiment, the first connecting shaft 7 is a columnar structure with a mounting boss 30 at the bottom. The first support base 2 has a mounting groove 31 at its top, and the mounting boss 30 is fixedly embedded in the mounting groove 31, thereby fixing the first connecting shaft 7 to the first support base 2. This embodiment not only achieves a fixed connection between the first connecting shaft 7 and the first support base 2, but also the cooperation between the mounting boss 30 and the mounting groove 31 provides precise positioning of the bottom of the first connecting shaft 7, preventing shaking or displacement during operation and ensuring the stability and reliability of the entire device.

[0058] In this embodiment, the upper end of the first connecting shaft 7 is suspended inside the ceramic protective sleeve 16 and has a clearance fit with the ceramic protective sleeve 16. This does not obstruct the rotation of the driven magnetic ring 5 around the first connecting shaft 7, ensuring that the active magnetic ring 4 can normally drive the impeller 6 to rotate, thus realizing the pump's fluid delivery function. Simultaneously, this clearance fit forms a channel space for liquid flow, allowing the liquid in the auxiliary channel to flow smoothly in the gap between the first connecting shaft 7 and the ceramic protective sleeve 16 without being obstructed due to an overly tight structure. To facilitate smoother liquid flow out from the gap between the first connecting shaft 7 and the ceramic protective sleeve 16, in this embodiment, the top surface of the first support base 2 has a structure that is high in the middle and low at the outer periphery, creating a flow gap 26 between the bottom of the impeller 6 and the first support base 2.

[0059] Example 2

[0060] This embodiment is basically the same as Embodiment 1 in structure and working principle, with the main differences being: the specific structures of the first connecting shaft 7 and the first support base 2 are different in this embodiment; the bottoms of the active magnetic ring 4 and the driven magnetic ring 5 are also respectively provided with a first back iron 32 and a second back iron 33. Based on the above differences, compared with Embodiment 1, the liquid circulation channel remains unchanged in this embodiment, while the auxiliary channel has changed.

[0061] like Figures 8 to 17 As shown, in this embodiment, the first connecting shaft 7 is a block structure with a placement groove 21 on its top. The lower end of the impeller base 17 is placed in the placement groove 21, and an embedding through hole 22 is also provided in the center of the placement groove 21. The top of the first support base 2 is provided with an embedding protrusion 23 that matches the embedding through hole 22. A guide groove 24 is provided on the embedding protrusion 23. A support protrusion 25 is provided at the bottom of the first connecting shaft 7, so that a flow gap 26 is formed between the first connecting shaft 7 and the first support base 2. In this embodiment, the height of the embedding protrusion 23 is less than or equal to the height of the embedding through hole 22, thereby ensuring that the embedding protrusion 23 will not affect the impeller base 17 after passing through the embedding through hole 22.

[0062] After the first connecting shaft 7 and the first support base 2 are assembled, the lower end of the driven magnetic ring 5 is located in the placement groove 21 and can rotate within the placement groove 21. The placement groove 21 provides a certain space for the rotation of the driven magnetic ring 5, while the block-shaped first connecting shaft 7 can provide a certain support and protection for the driven magnetic ring 5, ensuring that the driven magnetic ring 5 can rotate stably within it, and drive the driven magnetic ring 5 and the impeller 6 to rotate through the magnetic torque. The guide hole 20, the first through hole 18, the second through hole 19, the guide groove 24 and the flow gap 26 form an auxiliary channel. After the liquid enters from the guide hole 20, it passes through the first through hole 18, the second through hole 19 and the guide groove 24 in sequence, and then flows out from the flow gap 26 between the impeller base 17 and the first support base 2.

[0063] When the interventional pump is working, the liquid enters from the guide hole 20, flows through the first through hole 18 and the guide groove 24 in sequence, and finally flows out from the flow gap 26 between the impeller base 17 and the first support seat 2. During the flow process, a continuous flow path is maintained, which reduces the risk of thrombosis. At the same time, it carries away the heat generated by components such as the driven magnetic ring 5, achieving a cooling effect.

[0064] This embodiment achieves precise positioning and stable connection between components through the cooperation of the groove 21 with the impeller base 17, and the embedded through hole 22 with the embedded protrusion 23. This ensures that the entire device maintains a relatively stable state during operation, reducing energy loss and mechanical wear caused by component shaking or displacement, and improving the reliability and service life of the device. The block-shaped first connecting shaft 7 provides suitable rotation space and support for the driven magnetic ring 5, without affecting its normal rotation, while effectively protecting it and ensuring that the driven magnetic ring 5 can continuously and stably output magnetic torque to drive the impeller 6 to work normally. The design of the guide groove 24 and the flow gap 26 increases the flow path and fluidity of the liquid in the auxiliary channel, allowing the liquid to flow more fully and continuously, and to contact the heat-generating components such as the driven magnetic ring 5. This reduces the risk of thrombosis while better absorbing and carrying away heat, thereby improving cooling efficiency and ensuring that the device operates in a suitable temperature environment, avoiding performance degradation or damage due to excessive temperature.

[0065] In this embodiment, the bottom of the active magnetic ring 4 and the driven magnetic ring 5 are respectively fixed with a first back iron 32 and a second back iron 33, as detailed below. Figure 8 As shown in the diagram. In this embodiment, the main function of the first back iron 32 and the second back iron 33 is to assist the active magnetic ring 4 and the driven magnetic ring 5 in efficiently transmitting the magnetic field, minimizing energy loss. Their materials can be common silicon steel sheets, soft magnetic materials, amorphous alloys, and ferrites, etc. The first back iron 32 and the second back iron 33 respectively enhance the magnetic field strength of the active magnetic ring 4 and the driven magnetic ring 5. A stronger magnetic field makes the magnetic coupling between the active magnetic ring 4 and the driven magnetic ring 5 more significant, resulting in more stable and powerful magnetic torque transmission. This reduces the instability or interruption of magnetic force transmission caused by a weak magnetic field, improving the pump's operational reliability and stability. Furthermore, the first back iron 32 and the second back iron 33 can guide the direction of the magnetic field, making the magnetic field distribution generated by the active magnetic ring 4 and the driven magnetic ring 5 more uniform and reasonable. This helps reduce magnetic field leakage, lower energy loss, and improve the utilization rate of magnetic energy, allowing more magnetic energy to be used to drive the impeller 6 to rotate, thereby improving the pump's efficiency.

[0066] When motor 1 drives the active magnetic ring 4 to rotate, the first back iron 32, which is fixed to the bottom of the active magnetic ring 4, rotates along with it. The first back iron 32, with its high magnetic permeability, converges and guides the magnetic field generated by the active magnetic ring 4, enhancing and optimizing its magnetic field. Simultaneously, the second back iron 33, fixed to the bottom of the driven magnetic ring 5, similarly affects its magnetic field. As the active magnetic ring 4 rotates, its magnetic field changes. Through magnetic coupling, the changed magnetic field passes through the space between the first back iron 32 and the second back iron 33, acting on the driven magnetic ring 5. The second back iron 33 enhances the driven magnetic ring 5's ability to receive magnetic fields, enabling it to more accurately and efficiently sense changes in the magnetic field of the active magnetic ring 4, thereby generating a corresponding magnetic torque that drives the driven magnetic ring 5 to rotate, ultimately driving the impeller 6 to rotate and achieve fluid transport.

Claims

1. A magnetically coupled sealed intervention pump, characterized in that, The device includes a motor (1), a first support base (2), an active magnetic ring (4), a driven magnetic ring (5), an impeller (6), and a first connecting shaft (7). The first support base (2) is sealed and fixed to the outer wall of the motor (1) to form a first assembly cavity (9). The output shaft (11) of the motor (1) is coaxially fixed with the active magnetic ring (4) and both are sealed in the first assembly cavity (9). The output shaft (11) drives the active magnetic ring (4) to rotate synchronously. The bottom of the first connecting shaft (7) is fixed on the first support seat (2). The impeller (6) is located above the first support seat (2) and is rotatably connected to the first connecting shaft (7). The driven magnetic ring (5) is fixed at the lower end of the impeller (6) and drives the impeller (6) to rotate synchronously through the magnetic torque generated by its coupling with the active magnetic ring (4). It also includes a ceramic protective sleeve (16) and an impeller base (17). The impeller base (17) is located below the driven magnetic ring (5). The ceramic protective sleeve (16) is located in the inner hole of the driven magnetic ring (5) and is fixedly connected to the driven magnetic ring (5). Its lower end is fixedly connected to the impeller base (17). The impeller (6) includes a hub (601), blades (602) and a mounting base (603). The hub (601) is fixed on the top of the mounting base (603), and the blades (602) are fixed on the outer periphery of the hub (601). A second assembly cavity (10) is provided on the mounting base (603), and the driven magnetic ring (5) is disposed in the second assembly cavity (10). The ceramic protective sleeve (16) has a first through hole (18) inside, and the impeller base (17) has a second through hole (19) communicating with the first through hole (18). The mounting base (603) has a guide hole (20) communicating with the first through hole (18). The guide hole (20), the first through hole (18) and the second through hole (19) form an auxiliary channel. After entering from the guide hole (20), the liquid flows through the first through hole (18) and the second through hole (19) in sequence, and then flows out from the gap between the impeller base (17) and the first support base (2). The first connecting shaft (7) is a block structure with a placement groove (21) on its top. The lower end of the impeller base (17) is placed in the placement groove (21). An embedding through hole (22) is also provided in the center of the placement groove (21). The top of the first support base (2) is provided with an embedding protrusion (23) that matches the embedding through hole (22). A guide groove (24) is provided on the embedded protrusion (23); a support protrusion (25) is provided at the bottom of the first connecting shaft (7) so that a flow gap (26) is formed between the first connecting shaft (7) and the first support seat (2).

2. The magnetically coupled sealed intervention pump according to claim 1, characterized in that, It also includes a flow path outlet pipe (12), a support pipe (13), a second support seat (3), and a second connecting shaft (8); the upper and lower ends of the flow path outlet pipe (12) are fixedly connected to the support pipe (13) and the first support seat (2) respectively, and the impeller (6) and the second support seat (3) are both located inside the flow path outlet pipe (12); the second support seat (3) is located above the impeller (6) and is fixedly connected to the flow path outlet pipe (12), and the impeller (6) is rotatably connected to the second support seat (3) through the second connecting shaft (8); The second support (3) has a liquid through hole (14) and the lower part of the flow path outlet pipe (12) has a liquid outlet (15). The circulating liquid is input from the upper end of the support pipe (13), flows through the liquid through hole (14), is transported by the impeller (6), and flows out from the liquid outlet (15).

3. The magnetically coupled sealed intervention pump according to claim 1 or 2, characterized in that, It also includes a bushing (27), the lower end of which is fixedly sleeved on the output shaft (11), and the upper end is placed in the inner hole of the active magnetic ring (4) and fixedly connected to the active magnetic ring (4).

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