Magnetic coupling sealing intervention pump

Abstract

The invention belongs to the technical field of medical instruments, and discloses a magnetic coupling sealing intervention pump which comprises a motor, a first supporting seat, a driving magnetic ring, a driven magnetic ring, an impeller and a first connecting shaft, and the first supporting seat is fixed to the outer wall of the motor in a sealed mode to form a first assembling cavity; the output shaft and the driving magnetic ring are coaxially and fixedly arranged and are both arranged in the first assembling cavity in a sealed mode, and the output shaft rotates to drive the driving magnetic ring to rotate synchronously. The bottom of the first connecting shaft is fixed to the first supporting base, the impeller is rotationally connected with the first connecting shaft, and the driven magnetic ring is fixed to the lower end of the impeller and drives the impeller to rotate synchronously through magnetic torque generated by coupling of the driven magnetic ring and the driving magnetic ring. Rotation of the output shaft of the motor is transmitted to the impeller through magnetic coupling transmission between the driving magnetic ring and the driven magnetic ring, so that direct mechanical connection and sealing structures are not needed between the output shaft of the motor and the impeller, the leakage problem possibly caused by mechanical sealing in a traditional pump is avoided, and the sealing performance and reliability of the intervention pump are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a magnetically coupled sealed interventional pump. Background Art

[0002] As an important medical device, interventional pump plays a key role in cardiovascular surgery and long-term cardiac assist therapy. Its core function is to mechanically assist or replace the heart's pumping function to ensure stable and continuous blood circulation. It plays an irreplaceable role in the treatment of serious heart diseases such as heart failure.

[0003] Interventional pumps primarily rely on electric motors as a power source to drive the pump and deliver blood. Due to the specialized operating environment of interventional pumps, which often require direct contact with human blood, this poses significant challenges to the motor's sealing performance. If the motor seal is not adequate, blood components may seep into the motor, causing short circuits, damage, and even serious medical accidents. Currently, the industry primarily utilizes two common methods for motor sealing: liquid medium perfusion sealing and traditional sealing rings.

[0004] Liquid perfusion seals continuously deliver liquid into the motor, utilizing the pressure and fluidity of the liquid to form a barrier that prevents blood from penetrating through the motor shaft. While this method offers a certain sealing effect, it also has the following drawbacks: a complex perfusion control system increases the overall complexity and cost of the device; unstable perfusion flow indirectly affects the stability of the pumped blood flow, thereby impacting the therapeutic effect; and, in addition, the perfusion fluid itself flows from the rear of the motor to the shaft, ensuring a continuous high pressure inside the motor to act as a seal. While this seal is achieved, the perfusion fluid is discharged directly into the patient's body, potentially introducing particulate contaminants and increasing the risk of stroke. Furthermore, anticoagulants such as heparin often contained in the perfusion fluid can interfere with the patient's electrolyte balance, posing additional health risks.

[0005] Traditional sealing involves placing a traditional sealing ring at the front end of the motor, creating a physical barrier to prevent blood from entering the motor. While this approach initially proved effective, it also has drawbacks: As the motor shaft continues to rotate, the sealing ring inevitably wears, degrading sealing performance. Furthermore, particles produced by this wear can enter the body, posing long-term health risks to patients. Even using sealing rings made of ultra-wear-resistant materials, their service life is relatively limited, making them inadequate for long-term treatment. This limits the applicability and effectiveness of interventional pumps.

[0006] Based on the above analysis, although the existing interventional pump motor sealing methods 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 object of the present invention is to provide a magnetic coupling 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 the technical problem is: a magnetically coupled sealed intervention pump, comprising a motor, a first support seat, an active magnetic ring, a driven magnetic ring, an impeller and a first connecting shaft, wherein the first support seat 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 and arranged in the first assembly cavity, and the active magnetic ring is driven to rotate synchronously by the rotation of the output shaft; The bottom of the first connecting shaft is fixed on the first supporting seat, the impeller is located above the first supporting seat and is rotatably connected to the first connecting shaft, the driven magnetic ring is fixed at the lower end of the impeller, and the magnetic torque generated by the coupling between the driven magnetic ring and the active magnetic ring drives the impeller to rotate synchronously.

[0009] The working principle of the magnetically coupled sealed interventional pump of the present invention is as follows: after the motor is started, its output shaft rotates. Since the output shaft of the motor is fixedly arranged coaxially with the active magnetic ring and both are sealed in the first assembly cavity of the first support seat, the rotation of the output shaft will drive the active magnetic ring to rotate synchronously. The impeller is located above the first support seat and is rotatably connected to the first connecting shaft, so that the impeller can rotate freely with the first connecting shaft as the rotation center. At the same time, the driven magnetic ring is fixed to 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, and then drive the impeller to rotate synchronously, realizing the fluid conveying function of the pump.

[0010] Furthermore, it also includes a flow outlet pipe, a support pipe, a second support seat, and a second connecting shaft; the upper end and the lower end of the flow outlet pipe are fixedly connected to the support pipe and the first support seat, respectively, and the impeller and the second support seat are both arranged inside the flow outlet pipe; the second support seat is located above the impeller and is fixedly connected to the flow outlet pipe, and the impeller is rotatably connected to the second support seat via the second connecting shaft; A liquid through hole is provided on the second support seat, and a liquid outlet is provided on the tube wall at the lower part of the flow path outlet tube. The circulating liquid is input from the upper end of the support tube, flows through the liquid through hole, is transported by the impeller, and then flows out from the liquid outlet.

[0011] Furthermore, it also includes a ceramic protective sleeve and an impeller base. The impeller base is arranged below the driven magnetic ring. The ceramic protective sleeve is arranged in the inner hole of the driven magnetic ring and is fixedly connected to the driven magnetic ring. The lower end of the ceramic protective sleeve is fixedly connected to the impeller base.

[0012] Furthermore, the impeller includes a hub, blades and a mounting seat, the hub is fixed on the top of the mounting seat, and the blades are fixed on the outer periphery of the hub; a second assembly cavity is opened on the mounting seat, and the driven magnetic ring is arranged in the second assembly cavity.

[0013] Furthermore, a first through hole is provided inside the ceramic protective sleeve, a second through hole connected to the first through hole is provided on the impeller base, and a guide hole connected to the first through hole is provided on the mounting seat; 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 seat.

[0014] Furthermore, the first connecting shaft is a columnar structure, with the lower end fixed on the first support seat, and the upper end suspended in the ceramic protective sleeve and loosely matched with the ceramic protective sleeve.

[0015] 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 hole is also opened in the center of the placement groove; the top of the first support seat is provided with an embedding protrusion matching the embedding hole.

[0016] Furthermore, a guide groove is provided on the embedded protrusion; and a supporting 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 supporting seat.

[0017] Furthermore, it also includes a shaft sleeve, 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.

[0018] The beneficial effects of the present invention are: 1. This invention transmits the rotation of the motor output shaft to the impeller through magnetic coupling between the active and passive 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 due to mechanical seals in traditional pumps and improving the sealing and reliability of interventional pumps. The magnetic coupling transmission eliminates contact wear, avoiding particulate contamination caused by friction in traditional mechanical seals. It also reduces the risk of damage to the power source of the traditional active shaft due to overload. 2. The present invention forms an auxiliary channel by opening corresponding through-holes in the ceramic protective sleeve, impeller base, and mounting seat. This allows the liquid to form a continuous flow path within the channel, preventing prolonged stagnation of blood in a certain area and thus reducing the risk of thrombosis. At the same time, the temperature of the driven magnetic ring and surrounding components is reduced during the flow process, preventing component performance degradation, deformation, or damage due to excessive temperatures, ensuring stable operation of the interventional pump in an appropriate temperature environment. 3. The present invention adopts a non-perfusion control system, which simplifies the entire system. Compared with the interventional blood pump using a sealing ring, the present invention not only greatly reduces the release of particles, but also has a longer stable operation time of the system, good overall applicability and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts. Figure 1 This is a schematic diagram of an explosion structure of Example 1 of the present invention.

[0020] Figure 2 This is a schematic diagram of the main structure of Example 1 of the present invention.

[0021] Figure 3 It is along Figure 2 A structural diagram of the AA section.

[0022] Figure 4 yes Figure 3 A partially enlarged schematic diagram.

[0023] Figure 5 A schematic diagram of the matching relationship between the first support seat and the first connecting shaft in Example 1 of the present invention.

[0024] Figure 6 It is a structural schematic diagram of the impeller of the present invention.

[0025] Figure 7 It is a structural schematic diagram of the second support base of the present invention.

[0026] Figure 8 This is a schematic diagram of an explosion structure of Example 2 of the present invention.

[0027] Figure 9 This is a schematic diagram of the main structure of Example 2 of the present invention.

[0028] Figure 10 It is along Figure 9 A structural schematic diagram of the BB section.

[0029] Figure 11 yes Figure 10 A partially enlarged schematic diagram.

[0030] Figure 12 A schematic structural diagram of the first support base in Example 2 of the present invention.

[0031] Figure 13 A schematic structural diagram of the first connecting shaft in Example 2 of the present invention.

[0032] Figure 14 yes Figure 13 A structural diagram from another perspective.

[0033] Figure 15 Schematic diagram of the three-dimensional structure of the first support seat and the first connecting shaft in Example 2 of the present invention.

[0034] Figure 16 Schematic diagram of the main structure of the first support seat and the first connecting shaft in embodiment 2 of the present invention.

[0035] Figure 17 Schematic diagram of the top view of the structure of the first support seat and the first connecting shaft in embodiment 2 of the present invention.

[0036] In the figure: 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. Diversion hole; 21. Placement groove; 22. Embedding through hole; 23. Embedding protrusion; 24. Diversion groove; 25. Support protrusion; 26. Flow gap; 27. Bushing; 28. Bracket; 29. ​​Bearing; 30. Mounting boss; 31. Mounting slot; 32. First back iron; 33. Second back iron 601. Hub; 602. Blades; 603. Mounting seat. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work shall fall within the scope of protection of the present invention.

[0038] Example 1 like Figures 1 to 7As shown, a magnetically coupled sealed interventional pump comprises a motor 1, a first support seat 2, an active magnetic ring 4, a driven magnetic ring 5, an impeller 6 and a first connecting shaft 7, wherein the first support seat 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 fixedly arranged coaxially with the active magnetic ring 4, and both are sealed and arranged in the first assembly cavity 9, and the active magnetic ring 4 is driven to rotate synchronously by the rotation of the output shaft 11. 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 the impeller 6 is driven to rotate synchronously by the magnetic torque generated by the coupling between it and the active magnetic ring 4. It also includes a shaft sleeve 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 is fixedly connected to the active magnetic ring 4.

[0039] The working principle of the magnetic coupling sealed intervention pump of this embodiment is as follows: after the motor 1 is started, its output shaft 11 rotates. Since the output shaft 11 of the motor 1 is fixedly arranged coaxially with the active magnetic ring 4 and both are sealed in the first assembly cavity 9 of the first support seat 2, the rotation of the output shaft 11 will drive the active magnetic ring 4 to rotate synchronously. The lower end of the sleeve 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 plays a role in further stabilizing the connection and transmission. The impeller 6 is located above the first support seat 2 and is rotatably connected to the first connecting shaft 7, so that the impeller 6 can rotate freely with the first connecting shaft 7 as the rotation center. At the same time, the driven magnetic ring 5 is fixed to 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, and then drive the impeller 6 to rotate synchronously, realizing the fluid conveying function of the pump.

[0040] This embodiment transmits the rotation of the output shaft 11 of the motor 1 to the impeller 6 through the magnetic coupling transmission between the active magnetic ring 4 and the driven magnetic ring 5, so that there is no need for a direct mechanical connection and sealing structure between the output shaft 11 of the motor 1 and the impeller 6. The structure of this embodiment avoids the leakage problem that may occur due to mechanical seals in traditional pumps, and improves the sealing and reliability of the interventional pump. In actual use, the specific materials of the active magnetic ring 4 and the driven magnetic ring 5 are common materials, such as neodymium iron boron, ferrite and adhesive magnets, etc., which can achieve the functions of this embodiment. Neodymium iron boron is preferred.

[0041] This embodiment adopts a non-perfusion design. Compared to existing perfusion interventional blood pumps, this embodiment lacks a perfusion control system, making the entire system simpler. Compared to interventional blood pumps using sealing rings, this embodiment not only significantly reduces particle release but also extends the system's stable operation time, thereby increasing its applicability.

[0042] like Figures 1 to 4As shown, this embodiment also includes a flow outlet pipe 12, a support pipe 13, a second support seat 3 and a second connecting shaft 8; the upper end and the lower end of the flow 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 arranged inside the flow outlet pipe 12; the second support seat 3 is located above the impeller 6 and is fixedly connected to the flow outlet pipe 12, and 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 tube wall at the lower part of the flow outlet pipe 12, and the circulating liquid (the "circulating liquid" in the present invention is "blood" in the medical scenario) is input from the upper end of the support pipe 13, flows through the liquid through hole 14, and is transported by the impeller 6 and then flows out from the liquid outlet 15. In actual design, the second support seat 3 can be fixedly connected to the flow outlet pipe 12 only, or it can be fixedly connected to the support pipe 13 only, or the upper part can be fixedly connected to the support pipe 13 and the lower part can be fixedly connected to the flow outlet pipe 12 (that is, the junction of the support pipe 13 and the flow outlet pipe 12). The specific selection needs to be made according to actual needs.

[0043] The circulating liquid is input from the upper end of the support tube 13 and enters the flow outlet pipe 12 connected to the support tube 13. Since the second support seat 3 is fixed in the flow outlet pipe 12 and is located above the impeller 6, the liquid through holes 14 opened therein allow the liquid to pass through, and the circulating liquid reaches the impeller 6 after flowing through these liquid through holes 14. Driven by the driven magnetic ring 5, the impeller 6 is rotatably connected to the second support seat 3 through the second connecting shaft 8, and a bearing 29 is installed between the second support seat 3 and the second connecting shaft 8, so that the impeller 6 can flexibly rotate around the second connecting shaft 8 under the impact of the circulating liquid or its own power, thereby accelerating the transportation of the liquid. Finally, the liquid transported by the impeller 6 flows out from the liquid outlet 15 opened on the lower tube wall of the flow outlet pipe 12, completing the liquid circulation transportation process as shown in the following figure. Figure 4 As shown (the arrows in the figure represent the direction of liquid flow).

[0044] In this embodiment, two or more brackets 28 are further provided at the upper end of the support tube 13, and are evenly distributed on the support tube 13. This arrangement enhances the support stability of the entire device, reduces shaking and vibration caused by liquid flow or external factors, and helps extend the service life of the device. In a preferred embodiment of this embodiment, the number of brackets is three.

[0045] In this embodiment, the impeller 6 further includes a ceramic protective sleeve 16 and an impeller base 17. The impeller base 17 is disposed below the driven magnetic ring 5. The ceramic protective sleeve 16 is disposed within the inner hole of the driven magnetic ring 5 and is fixedly connected to the driven magnetic ring 5. The lower end of the ceramic protective sleeve 16 is fixedly connected to the impeller base 17. The impeller 6 includes a hub 601, blades 602, and a mounting seat 603. The hub 601 is fixed to the top of the mounting seat 603, and the blades 602 are fixed to the outer periphery of the hub 601. The mounting seat 603 defines a second assembly cavity 10, within which the driven magnetic ring 5 is disposed. A first through hole 18 is formed inside the ceramic protective sleeve 16, and a second through hole 19 communicating with the first through hole 18 is formed on the impeller base 17, and a guide hole 20 communicating with the first through hole 18 is formed on the mounting base 603; the guide hole 20, the first through hole 18 and the second through hole 19 form an auxiliary channel, and the liquid enters from the guide hole 20 and 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 shown in FIG. Figure 4 As shown (the arrows in the figure represent the direction of liquid flow).

[0046] The impeller base 17 is arranged below the driven magnetic ring 5, and can provide bottom support and positioning for the driven magnetic ring 5. The ceramic protective sleeve 16 in this embodiment has good wear resistance, corrosion resistance and insulation properties. It is arranged in the inner hole of the driven magnetic ring 5, which can effectively prevent impurities, particles, etc. in the liquid from wearing and corroding the inner hole of the driven magnetic ring 5, and protect the normal structure and performance of the driven magnetic ring 5. The mounting seat 603 opens a second assembly cavity 10, and the driven magnetic ring 5 is fixedly arranged in the second assembly cavity 10, which can realize the assembly of the impeller 6 and the driven magnetic ring 5, so that the driven magnetic ring 5 can drive the impeller 6 to rotate. When the interventional pump is working, the liquid enters the auxiliary channel from the guide hole 20, flows through the first through hole 18 and the second through hole 19 in sequence, and finally flows out from the gap between the impeller base 17 and the first support seat 2.

[0047] In this embodiment, an auxiliary channel is formed by opening corresponding through holes on the ceramic protective sleeve 16, the impeller base 17 and the mounting seat 603, so that the liquid can flow in the channel. On the one hand, the design of the auxiliary channel ensures the continuous flow of the liquid. In the traditional pump structure, there may be some areas where the blood flows slowly or almost does not flow due to the fluid dynamic characteristics. These areas are called "dead zones". In the dead zone, blood easily coagulates to form thrombi, which is very dangerous for patients because the thrombi may fall off and reach important organs with the blood circulation, causing serious consequences such as embolism. The design of the auxiliary channel in this embodiment enables the liquid to form a continuous flow path in the pump body, avoiding the blood from stagnating in a certain area for a long time, thereby reducing the risk of thrombosis. On the other hand, when the liquid flows, it absorbs the heat generated by the driven magnetic ring 5 during operation and takes the heat out, thereby reducing the temperature of the driven magnetic ring 5 and surrounding components, preventing the performance degradation, deformation or damage of the components due to excessive temperature, and ensuring that the interventional pump operates stably in a suitable temperature environment.

[0048] In this embodiment, the first connecting shaft 7 is a columnar structure, with its lower end fixed to the first support base 2 and its upper end suspended within the ceramic protective sleeve 16 and loosely 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 formed on the surface of the first connecting shaft 7 along the axial direction.

[0049] In the actual design of this embodiment, the first connecting shaft 7 is shaped as a columnar structure with a mounting boss 30 at the bottom. A mounting groove 31 is defined at the top of the first support base 2, and the mounting boss 30 is fixedly embedded in the mounting groove 31, thereby securing 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 can precisely limit the bottom of the first connecting shaft 7, preventing the first connecting shaft 7 from shaking or deflecting during operation, thereby ensuring the stability and reliability of the entire device.

[0050] In this embodiment, the upper end of the first connecting shaft 7 is suspended in the ceramic protective sleeve 16 and is in clearance fit with the ceramic protective sleeve 16, which will not hinder 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, thereby realizing the fluid delivery function of the pump. At the same time, this clearance fit forms a channel space for liquid flow, and the liquid in the auxiliary channel can flow smoothly in the gap between the first connecting shaft 7 and the ceramic protective sleeve 16 without being blocked due to the overly tight structure. In order to facilitate the liquid to flow out more smoothly from the gap between the first connecting shaft 7 and the ceramic protective sleeve 16, the top surface of the first support seat 2 in this embodiment is a structure with a high middle and a low periphery, so that a flow gap 26 is formed between the bottom of the impeller 6 and the first support seat 2.

[0051] Example 2 This embodiment has essentially the same structure and operating principle as Example 1, with the primary differences being: the specific structures of the first connecting shaft 7 and the first support base 2 are different; and the active magnetic ring 4 and the driven magnetic ring 5 of this embodiment are further provided with a first back iron 32 and a second back iron 33 at their bases, respectively. Based on these differences, compared to Example 1, the liquid circulation channel of this embodiment remains unchanged, while the auxiliary channel has been modified.

[0052] like Figures 8 to 17 As shown, in this embodiment, the first connecting shaft 7 is a block-shaped structure with a placement groove 21 defined at its top. The lower end of the impeller base 17 is positioned within the placement groove 21. An insertion hole 22 is also defined in the center of the placement groove 21. A placement protrusion 23 is defined at the top of the first support base 2, matching the insertion hole 22. A flow guide groove 24 is defined on the insertion protrusion 23. A support protrusion 25 is provided at the bottom of the first connecting shaft 7, creating a flow gap 26 between the first connecting shaft 7 and the first support base 2. In this embodiment, the height of the insertion protrusion 23 is less than or equal to the height of the insertion hole 22, ensuring that the insertion protrusion 23 does not pass through the insertion hole 22 and affect the impeller base 17.

[0053] After the first connecting shaft 7 and the first support seat 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 amount of space for the rotation of the driven magnetic ring 5. At the same time, the block-shaped structure of the first connecting shaft 7 can provide a certain degree of support and protection for the driven magnetic ring 5, ensuring that the driven magnetic ring 5 can rotate stably therein 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 entering through the guide hole 20, the liquid passes through the first through hole 18, the second through hole 19, the guide groove 24 in sequence, and then flows out through the flow gap 26 between the impeller base 17 and the first support seat 2.

[0054] 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, reducing the risk of thrombosis; at the same time, the heat generated by components such as the driven magnetic ring 5 is taken away to achieve a cooling effect.

[0055] This embodiment achieves precise positioning and secure connection between the components by placing the groove 21 in cooperation with the impeller base 17, and the embedded through hole 22 in cooperation with the embedded protrusion 23, so that the entire device can maintain 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, which neither affects the normal rotation of the driven magnetic ring 5 nor effectively protects it, ensuring that the driven magnetic ring 5 can continuously and stably output magnetic torque to drive the impeller 6 to operate 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 with heat-generating components such as the driven magnetic ring 5. While reducing the risk of thrombosis, it better absorbs and removes heat, thereby improving the cooling efficiency, ensuring that the device operates in an appropriate temperature environment, and avoiding performance degradation or damage caused by excessive temperature.

[0056] In this embodiment, the first back iron 32 and the second back iron 33 are fixed to the bottom of the active magnetic ring 4 and the driven magnetic ring 5 respectively. Figure 8 As shown. The main function of the first back iron 32 and the second back iron 33 in this embodiment is to assist the active magnetic ring 4 and the driven magnetic ring 5 to conduct the magnetic field efficiently and minimize energy loss. The material thereof can be common silicon steel sheets, soft magnetic materials, amorphous alloys and ferrites. 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. The stronger magnetic field makes the magnetic coupling between the active magnetic ring 4 and the driven magnetic ring 5 more significant, and the magnetic torque transmission is more stable and powerful, reducing the instability or interruption of the magnetic force transmission caused by the weak magnetic field, thereby improving the working reliability and stability of the pump. In addition, the first back iron 32 and the second back iron 33 can guide the direction of the magnetic field, so that the magnetic field generated by the active magnetic ring 4 and the driven magnetic ring 5 is more uniform and reasonable, which helps to reduce magnetic field leakage, reduce energy loss, improve the utilization rate of magnetic energy, and allow more magnetic energy to be used to drive the impeller 6 to rotate, thereby improving the efficiency of the pump.

[0057] When the motor 1 drives the active magnetic ring 4 to rotate, since the first back iron 32 is fixed to the bottom of the active magnetic ring 4, the first back iron 32 will rotate with the active magnetic ring 4. The first back iron 32, with its own high magnetic permeability, plays a role in gathering and guiding the magnetic field generated by the active magnetic ring 4, thereby enhancing and optimizing the magnetic field of the active magnetic ring 4. At the same time, the second back iron 33 fixed to the bottom of the driven magnetic ring 5 will also perform similar processing on the magnetic field of the driven magnetic ring 5. When the active magnetic ring 4 rotates, its magnetic field changes. Through the principle of magnetic coupling, the changed magnetic field passes through the space between the first back iron 32 and the second back iron 33 and acts on the driven magnetic ring 5. The second back iron 33 enhances the ability of the driven magnetic ring 5 to receive the magnetic field, so that the driven magnetic ring 5 can more accurately and efficiently sense the changes in the magnetic field of the active magnetic ring 4, thereby generating a corresponding magnetic torque, driving the driven magnetic ring 5 to rotate, and finally driving the impeller 6 to rotate to achieve fluid transportation.

Claims

1. A magnetically coupled sealed intervention pump, characterized in that: The invention comprises a motor (1), a first support seat (2), an active magnetic ring (4), a driven magnetic ring (5), an impeller (6) and a first connecting shaft (7), wherein the first support seat (2) is sealed and fixed on the outer wall of the motor (1) to form a first assembly cavity (9); the output shaft (11) of the motor (1) and the active magnetic ring (4) are fixedly arranged coaxially, and both are sealed and arranged in the first assembly cavity (9), and the active magnetic ring (4) is driven to rotate synchronously by the rotation of the output shaft (11); 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), and 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 the coupling between the driven magnetic ring (5) and the active magnetic ring (4).

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 end and the lower end 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 arranged 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) via 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 wall of the lower portion of the flow path outlet pipe (12). Circulating liquid is input from the upper end of the support pipe (13), flows through the liquid through hole (14), and is transported by the impeller (6) before flowing 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 ceramic protective sleeve (16) and an impeller base (17), wherein the impeller base (17) is arranged below the driven magnetic ring (5), the ceramic protective sleeve (16) is arranged in the inner hole of the driven magnetic ring (5) and is fixedly connected to the driven magnetic ring (5), and its lower end is fixedly connected to the impeller base (17).

4. The magnetically coupled sealed intervention pump according to claim 3, characterized in that: The impeller (6) comprises a hub (601), blades (602) and a mounting seat (603); the hub (601) is fixed to the top of the mounting seat (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 seat (603), and the driven magnetic ring (5) is arranged in the second assembly cavity (10).

5. The magnetically coupled sealed intervention pump according to claim 4, characterized in that: A first through hole (18) is provided inside the ceramic protective sleeve (16), and a second through hole (19) is provided on the impeller base (17) and is communicated with the first through hole (18), and a guide hole (20) is provided on the mounting seat (603) and is communicated 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, and liquid enters from the guide hole (20) and flows through the first through hole (18), the second through hole (19) in sequence, and then flows out from the gap between the impeller base (17) and the first support seat (2).

6. The magnetically coupled sealed intervention pump according to claim 5, characterized in that: The first connecting shaft (7) is a columnar structure, with the lower end fixed on the first support seat (2), and the upper end suspended in the ceramic protective sleeve (16) and loosely fitted with the ceramic protective sleeve (16).

7. The magnetically coupled sealed intervention pump according to claim 5, characterized in that: The first connecting shaft (7) is a block-shaped structure, and a placement groove (21) is provided 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); an embedding protrusion (23) matching the embedding through hole (22) is provided on the top of the first support seat (2).

8. The magnetically coupled sealed intervention pump according to claim 7, characterized in that: A guide groove (24) is provided on the embedded protrusion (23); and 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).

9. The magnetically coupled sealed intervention pump according to any one of claims 1, 2, 4, 5, 6, 7 or 8, characterized in that: It also includes a shaft sleeve (27), the lower end of which is fixedly sleeved on the output shaft (11), and the upper end of which is placed in the inner hole of the active magnetic ring (4) and fixedly connected to the active magnetic ring (4).

10. The magnetically coupled sealed intervention pump according to claim 3, characterized in that: It also includes a shaft sleeve (27), the lower end of which is fixedly sleeved on the output shaft (11), and the upper end of which 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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