An axial flow high-temperature liquid metal magnetic pump

Abstract

This invention discloses an axial-flow high-temperature liquid metal magnetic pump, belonging to the field of magnetic pump technology. It includes: a first positioning plate, rotatably mounted on the upper end of a central shaft via a rotating mechanism; an inner magnetic rotor and an outer magnetic rotor are coaxially and detachably mounted on the first positioning plate; a power mechanism is connected to the upper end of the first positioning plate, and a displacement stage is mounted on the power mechanism; a second positioning plate, detachably mounted below the first positioning plate and fixed to the central shaft; a middle magnetic rotor is mounted on the second positioning plate and rotatably nested between the inner and outer magnetic rotors; and a cooling mechanism is located below the second positioning plate, with the axial-flow power mechanism located below the cooling mechanism. This invention solves the problems of magnetic rotor failure at high temperatures, poor high-temperature resistance, and difficulty in stable long-term pumping in liquid metal pumping, achieving a streamlined structure and reducing the pump size.

Description

Technical Field

[0001] This invention belongs to the field of magnetic pump technology, specifically relating to an axial flow high-temperature liquid metal magnetic pump. Background Technology

[0002] High-temperature liquid metal transport has a wide range of applications, such as high-temperature metal smelting in industrial production, the highly promising liquid metal-cooled fast neutron reactors (sodium-cooled fast reactors and lead-cooled fast reactors, etc.) in fourth-generation nuclear reactor systems, cooling and heat dissipation of high-altitude and high-speed spacecraft, liquid metal thermal management devices for space stations, and efficient heat dissipation of electronic components.

[0003] Traditional liquid metal pumping methods primarily rely on pneumatic or direct mechanical transmission of power to the pump impeller. Pneumatic solutions suffer from issues such as insufficient pumping time, flow pulsation, control lag, and the risk of high-pressure gas leakage. Direct mechanical transmission solutions inevitably encounter dynamic sealing problems. For high-temperature liquid metal pumping, solving the high-temperature dynamic sealing problem requires more specialized sealing components, resulting in complex structures, high costs, and short lifespans.

[0004] Existing magnetic pumps mainly employ two methods: excitation coil drive and magnetic rotor drive, both of which achieve non-contact power transmission. The first method uses an excitation coil to generate a rotating magnetic field through which alternating current is passed. This rotating magnetic field drives the rotor to rotate, which in turn drives the impeller to achieve pumping. Examples include two rotorless centrifugal liquid metal magnetic pumps designed by Quan Hui and Han Wei et al. The second method involves arranging permanent magnet arrays on inner and outer magnetic rotors, with the inner and outer magnets meshing. The rotation of one magnetic rotor drives the other, which in turn drives the impeller to achieve pumping. Examples include a vertical submersible liquid metal magnetic pump designed by Fang Jinghui et al., and a magnetic pump for high-temperature liquid metal designed by Wen Languan et al.

[0005] However, the magnetic pump using the aforementioned high-temperature liquid metal is difficult to dissipate heat effectively when the temperature rises to around 700°C, and the magnetic rotor is prone to failure at high temperatures. Summary of the Invention

[0006] The purpose of this invention is to propose an axial flow high-temperature liquid metal magnetic pump, which aims to solve the problem that the magnetic rotor is prone to failure at high temperatures and is difficult to pump stably for a long time in liquid metal pumping, while achieving a cylindrical structure and reducing the size of the pump.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] This invention provides an axial-flow high-temperature liquid metal magnetic pump, including a central shaft, and further comprising:

[0009] The first positioning disk is rotatably mounted on the upper end of the central shaft via a rotating mechanism. The first positioning disk is coaxially and detachably equipped with an inner magnetic rotor and an outer magnetic rotor. The outer magnetic rotor is located outside the inner magnetic rotor. The upper end of the first positioning disk is connected to the output end of the power mechanism, and the power mechanism is equipped with a displacement stage.

[0010] The second positioning disk is detachably mounted below the first positioning disk and is fixed on the central shaft. The second positioning disk is equipped with a middle magnetic rotor, which is rotatably nested between the inner and outer magnetic rotors to form a magnetically coupled power mechanism. After the inner and outer magnetic rotors generate magnetic coupling, they drive the middle magnetic rotor to rotate. When the temperature of the middle magnetic rotor reaches the temperature threshold, the inner and outer magnetic rotors are axially separated from the middle magnetic rotor through the displacement stage, thus disengaging from the magnetic coupling state.

[0011] A cooling mechanism is rotatably mounted on the central shaft and located below the second positioning plate. An axial flow power mechanism is located below the cooling mechanism and is rotatably mounted on the central shaft. The cooling mechanism is used to separate and cool the axial flow power mechanism and the magnetic coupling power mechanism.

[0012] Furthermore, in the aforementioned axial flow high-temperature liquid metal magnetic pump, the inner magnetic rotor, outer magnetic rotor, and middle magnetic rotor are all provided with multiple square holes along the circumferential direction, and a permanent magnet is embedded in each of the square holes.

[0013] Furthermore, in the aforementioned axial flow high-temperature liquid metal magnetic pump, the lower end of the first positioning plate is provided with a top cover, the bottom of which is detachably connected to a magnetic rotor housing, the bottom of which is detachably connected to a cooling mechanism, the second positioning plate is disposed between the magnetic rotor housing and the cooling mechanism, and the top cover is rotatably disposed at the upper end of the central shaft via a rotating mechanism.

[0014] Furthermore, in the aforementioned axial flow high-temperature liquid metal magnetic pump, the rotating mechanism includes a spring, a sliding sleeve, and a first positioning sleeve; the sliding sleeve is rotatably disposed at the upper end of the central shaft, the spring is disposed between the sliding sleeve and the top cover, the magnetic rotor housing and the first positioning sleeve are rotatably connected, and the first positioning sleeve is fixed on the central shaft.

[0015] Furthermore, in the aforementioned axial flow high-temperature liquid metal magnetic pump, the magnetic rotor housing is provided with adjacent upper and lower grooves. The inner magnetic rotor is rotatably mounted on the upper groove, the middle magnetic rotor is rotatably mounted on the lower groove, and the outer magnetic rotor is rotatably mounted on the outer wall of the magnetic rotor housing. The inner, outer, and middle magnetic rotors are all provided with caps.

[0016] Furthermore, in the aforementioned axial flow high-temperature liquid metal magnetic pump, the cooling mechanism includes a cooling section shell and a water-cooling jacket. The upper end of the cooling section shell and the lower end of the magnetic rotor section shell are detachably connected and a first sealing ring is provided at the connection. The lower end of the cooling section shell and the upper end of the axial flow power mechanism are detachably connected and a second sealing ring is provided at the connection. The water-cooling jacket is fixed on the cooling section shell, and the cooling section shell is rotatably mounted on the central shaft.

[0017] Furthermore, in the aforementioned axial flow high-temperature liquid metal magnetic pump, the axial flow power mechanism includes an axial flow centrifugal impeller and an impeller section housing. The axial flow centrifugal impeller is mounted on a central shaft and is housed within the impeller section housing. The upper end of the impeller section housing and the lower end of the cooling section housing are detachably connected, and a second sealing ring is provided at the connection point.

[0018] Furthermore, in the aforementioned axial flow high-temperature liquid metal magnetic pump, the lower end of the impeller section housing is provided with a second positioning sleeve, which is rotatably mounted on the central shaft.

[0019] Furthermore, in the aforementioned axial flow high-temperature liquid metal magnetic pump, a support plate is detachably provided below the impeller section housing, and a third sealing ring is provided at the connection point. The inner wall of the support plate is rotatably connected to the lower end of the central shaft, and the lower end of the support plate has fan-shaped openings arranged circumferentially.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. To transmit greater mechanical energy while reducing energy consumption, this invention transmits power via magnetic coupling. An inner magnetic rotor, an outer magnetic rotor, and a middle magnetic rotor form a magnetically coupled power mechanism. The inner and outer magnetic rotors, after magnetic coupling, drive the middle magnetic rotor to rotate. The inner and outer magnetic rotors are detachably and sealed on a first positioning plate, and the middle magnetic rotor is detachably and sealed on a second positioning plate. A displacement platform is provided on the power mechanism, placing the inner, outer, and middle magnetic rotors in two separable structures. When the temperature of the middle magnetic rotor reaches a temperature threshold, the displacement platform allows axial displacement of the power mechanism and the inner and outer magnetic rotors to disengage from the magnetic coupling state, stopping pumping and preventing the magnetic rotor from failing at high temperatures. Furthermore, a high-efficiency water-cooling mechanism separates the axial flow power mechanism from the first and second positioning plates, thus separating the magnetic coupling section from the high-temperature axial flow centrifugal pump. The magnetic rotor is separated from the central shaft by a high-thermal-resistance second positioning plate, ensuring that the magnetic rotor can still operate effectively under high-temperature working conditions.

[0022] 2. In this invention, the magnetic coupling part is dynamically adjustable. The displacement table can control the position of the power mechanism toward the first positioning disk axial direction, thereby adjusting the displacement of the first positioning disk along the first positioning disk axial direction. The axial position of the inner layer magnetic rotor and the outer layer magnetic rotor relative to the middle layer magnetic rotor can be adjusted at any time. By adjusting the embedding depth of the inner layer magnetic rotor and the outer layer magnetic rotor, the magnitude of the magnetic coupling torque between the inner layer magnetic rotor and the outer layer magnetic rotor and the middle layer magnetic rotor can be adjusted. In an emergency, the magnetic coupling can be terminated and the power transmission can be disconnected.

[0023] 3. In this invention, the inner magnetic rotor, outer magnetic rotor and middle magnetic rotor can be expanded to increase the number of layers, adding multiple magnetic rotors to improve the magnetic coupling effect and further improve the transmission power; a high-efficiency water cooling mechanism is used to separate the high-temperature axial flow centrifugal pump below from the magnetic coupling section above, and the magnetic rotor is separated from the central shaft by a second positioning disk with high thermal resistance to ensure that the magnetic rotor can still work effectively under high-temperature working conditions.

[0024] 4. In this invention, the first positioning plate, the second positioning plate, the cooling mechanism, the axial flow power mechanism and the support plate do not involve dynamic seals. They all adopt sealing methods such as bolts, which have good sealing performance, high safety, compact structure, high power density and simple disassembly. In the later stage, the inner and outer magnetic rotors can be easily expanded to increase the number of layers, further improve the transmission power, realize the purpose of cylindrical structure and reduce pump size.

[0025] 5. This invention embeds N52 permanent magnets in the inner, middle and outer three-layer magnetic rotors. The magnetic coupling effect is better than the structure using excitation coils. Moreover, the structure is simpler. It does not use precision parts such as bearings, and does not use bearings to position the central shaft. Power is transmitted through magnetic coupling, avoiding the use of dynamic sealing structures. It can adapt to higher operating temperatures, works reliably in high-temperature environments, and avoids the problems caused by liquid metal corrosion. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the axial flow high-temperature liquid metal magnetic pump of the present invention.

[0027] Figure 2 This is a schematic diagram of the overall structure of the axial flow high-temperature liquid metal magnetic pump of the present invention.

[0028] Figure 3 This is a schematic diagram of the structure of the inner magnetic rotor, outer magnetic rotor and middle magnetic rotor of the present invention.

[0029] Figure 4 This is a cross-sectional view of the support disk of the present invention.

[0030] Figure 5 This is a schematic diagram of the axial flow centrifugal impeller of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. First positioning plate; 2. Inner magnetic rotor; 3. First bolt; 4. Outer magnetic rotor; 5. Upper cover of middle magnetic rotor; 6. Middle magnetic rotor; 7. Second bolt; 8. Outer magnetic rotor cover; 9. Fourth bolt; 10. Magnetic rotor housing; 11. First sealing ring; 12. Lower cover of middle magnetic rotor; 13. Inner magnetic ring cover; 14. Second positioning plate; 15. Cooling section housing; 16. Water cooling jacket; 17. Fifth bolt; 18. Second sealing ring; 19. Spring; 20. Top cover; 21. Sliding sleeve; 22. Third bolt; 23. Sixth bolt; 24. Fourth sealing ring; 25. First positioning sleeve; 26. Central shaft; 27. Axial flow centrifugal impeller; 28. Second positioning sleeve; 29. ​​Impeller section housing; 30. Seventh bolt; 31. Third sealing ring; 32. Support plate. Detailed Implementation

[0033] To enable those skilled in the art to better understand and implement the technical solutions of this invention, the invention will be further described below with reference to specific embodiments and accompanying drawings. The described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] Application No. 202011353427.1 discloses a magnetic pump for high-temperature liquid metal, including a pump body; the pump body includes a pump frame and a base; the pump frame has a liquid metal inlet; the magnetic pump also includes a rotating shaft blade, an inner magnetic rotor, an outer magnetic rotor, an isolation sleeve, and a motor; a blower shroud is fitted on the isolation sleeve, and a support sleeve is fitted on the blower shroud; one end of the support sleeve is fixedly connected to the base, and the other end of the support sleeve is fixedly connected to the motor; the outer magnetic rotor is fixedly connected to the inner side of the blower shroud near the base; the blower shroud includes a cylindrical portion fitted on the isolation sleeve. An end cap is located at the end of the cylindrical portion away from the base; the cylindrical portion has slots; the end cap has several oblique holes that can blow air into the isolation sleeve after rotation; the support sleeve has a second slot. However, when the working fluid temperature is very high (700℃-800℃), its invention mechanism is difficult to operate because: 1. The shaft is relatively thick and short, and the power of heat transfer from the liquid metal to the magnetic rotor is relatively high. When the temperature of the liquid metal rises to about 700℃, the air cooling system in this structure is difficult to dissipate heat effectively, and the magnetic rotor fails and cannot work at high temperatures; 2. The magnetic pump structure includes a bearing component. When the operating temperature rises to 700℃, precision components such as bearings are easily damaged by thermal deformation and other effects. At the same time, long-term high-temperature operation places high demands on the bearings; 3. The axial position of the inner magnetic rotor relative to the outer magnetic rotor is fixed, and it cannot quickly detach when the temperature exceeds the threshold.

[0035] Based on this, the present invention provides an axial flow high-temperature liquid metal magnetic pump, such as... Figure 1 As shown, including the central axis, it also includes:

[0036] A first positioning disk 1 is rotatably mounted on the upper end of a central shaft 26 via a rotating mechanism. An inner magnetic rotor 2 and an outer magnetic rotor 4 are coaxially and detachably mounted on the first positioning disk 1, with the outer magnetic rotor 4 located outside the inner magnetic rotor 2. The upper end of the first positioning disk 1 is connected to the output end of a power mechanism, which is equipped with a displacement stage. A second positioning disk 14 is detachably mounted below the first positioning disk 1 and fixed to the central shaft 26. A middle magnetic rotor 6 is mounted on the second positioning disk 14, rotatably nested within the inner magnetic rotor 2 and the outer magnetic rotor 2. A magnetic coupling power mechanism is formed between the rotors 4; after the inner magnetic rotor 2 and the outer magnetic rotor 4 generate magnetic coupling, they drive the middle magnetic rotor 6 to rotate. When the temperature of the middle magnetic rotor 6 reaches the temperature threshold, the inner magnetic rotor 2 and the outer magnetic rotor 4 are axially separated from the middle magnetic rotor 6 through the displacement table, and the magnetic coupling state is broken. The cooling mechanism is rotatably set on the central shaft 26 and located below the second positioning disk 14. An axial flow power mechanism is provided below the cooling mechanism. The axial flow power mechanism is rotatably set on the central shaft 26. The cooling mechanism is used to separate and cool the axial flow power mechanism and the magnetic coupling power mechanism.

[0037] To transmit higher mechanical energy while reducing energy consumption, this invention utilizes magnetic coupling to transmit power. An inner, outer, and middle magnetic rotor form a magnetically coupled power mechanism. The inner and outer magnetic rotors, after magnetic coupling, drive the middle magnetic rotor. The inner and outer magnetic rotors are detachably and sealed on a first positioning plate, while the middle magnetic rotor is detachably and sealed on a second positioning plate. A displacement platform is provided on the power mechanism, placing the inner, outer, and middle magnetic rotors in two separable structures. When the temperature of the magnetic rotor reaches a threshold, the displacement platform allows axial displacement of the power mechanism and the inner and outer magnetic rotors to disengage from the magnetic coupling, stopping pumping and preventing rotor failure at high temperatures. Furthermore, a high-efficiency water-cooling mechanism separates the axial power mechanism from the first and second positioning plates, thus separating the magnetic coupling section from the high-temperature axial centrifugal pump. The magnetic rotor is separated from the central shaft by a high-thermal-resistance second positioning plate, ensuring effective operation of the magnetic rotor even under high-temperature working conditions.

[0038] The following specific examples will provide further explanation.

[0039] Example 1

[0040] An axial flow high-temperature liquid metal magnetic pump, such as Figure 1-5 As shown, including the central axis, it also includes:

[0041] A first positioning disk 1 is rotatably mounted on the upper end of a central shaft 26 via a rotating mechanism. An inner magnetic rotor 2 and an outer magnetic rotor 4 are coaxially and detachably mounted on the first positioning disk 1, with the outer magnetic rotor 4 located outside the inner magnetic rotor 2. The upper end of the first positioning disk 1 is connected to the output end of a power mechanism, which is equipped with a displacement stage. A second positioning disk 14 is detachably mounted below the first positioning disk 1 and fixed to the central shaft 26. A middle magnetic rotor 6 is detachably mounted on the second positioning disk 14, and the middle magnetic rotor 6 is rotatably nested within the inner magnetic rotor 2. A magnetic coupling power mechanism is formed between the inner magnetic rotor 2 and the outer magnetic rotor 4. After the inner magnetic rotor 2 and the outer magnetic rotor 4 generate magnetic coupling, they drive the middle magnetic rotor 6 to rotate. When the temperature of the middle magnetic rotor 6 reaches the temperature threshold, the inner magnetic rotor 2 and the outer magnetic rotor 4 are axially separated from the middle magnetic rotor 6 through the displacement table, and the magnetic coupling state is broken. A cooling mechanism is set below the second positioning disk 14. An axial flow power mechanism is set below the cooling mechanism. The axial flow power mechanism is rotatably set on the central shaft 26. The cooling mechanism is used to separate and cool the axial flow power mechanism and the magnetic coupling power mechanism.

[0042] In this invention, the power mechanism is a motor, and the output end of the motor is connected to the first positioning disk 1. When the motor rotates, the first positioning disk 1 rotates, driving the inner magnetic rotor 2 and the outer magnetic rotor 4 to rotate. The rotation of the inner magnetic rotor 2 and the outer magnetic rotor 4 generates a magnetic coupling effect, causing the middle magnetic rotor 6 to rotate. After the second positioning disk 14 rotates, the central shaft 26 rotates, driving the axial flow power mechanism to rotate. Liquid metal enters through the bottom of the support disk 32, and the liquid working medium flows out after passing through the driving axial flow power mechanism.

[0043] The inner magnetic rotor 2 and the outer magnetic rotor 4 are coaxially and detachably mounted on the first positioning disk 1. The inner magnetic rotor 2 is fixed to the first positioning disk 1 by the first bolt 3, and the upper end of the outer magnetic rotor 4 is fixed to the first positioning disk 1 by the sixth bolt 23. The lower ends of the inner magnetic rotor 2 and the outer magnetic rotor 4 are located above the second positioning disk 14. The lower end of the inner magnetic rotor 2 is provided with an inner magnetic ring cover 13, and the lower end of the outer magnetic rotor 4 is provided with an outer magnetic rotor cover 8. The outer magnetic rotor 4 is located on the outermost side of the first positioning disk 1. The middle magnetic rotor 6 is located between the inner magnetic rotor 2 and the outer magnetic rotor 4, and the lower end of the middle magnetic rotor 6 is... The second bolt 7 is fixed on the second positioning plate 14. The upper end is provided with the upper cover 5 of the middle magnetic rotor, and the connection between the middle magnetic rotor 6 and the second positioning plate 14 is provided with the lower cover 12 of the middle magnetic rotor. When the inner magnetic rotor 2 and the outer magnetic rotor 4 rotate, the rotation generates a magnetic coupling effect, causing the middle magnetic rotor 6 to rotate. The axial flow power mechanism is separated from the first positioning plate and the second positioning plate by the water cooling mechanism, thereby separating the magnetic coupling section from the high-temperature working axial flow centrifugal pump. The magnetic rotor is separated from the central shaft by the second positioning plate with high thermal resistance, ensuring that the magnetic rotor can still work effectively under high-temperature working conditions. The water cooling mechanism also achieves a cooling effect after the central shaft 26 rotates. The power mechanism includes a displacement platform, specifically a displacement platform on the motor. This platform controls the motor's axial position relative to the first positioning disk 1, thereby adjusting the axial displacement of the first positioning disk. This allows for continuous adjustment of the axial positions of the inner magnetic rotor 2 and outer magnetic rotor 4 relative to the middle magnetic rotor 6. The embedding depth of the inner and outer magnetic rotors 2 and 4 adjusts the magnetic coupling torque between them and the middle magnetic rotor 6. The magnetic coupling torque is maximized when the upper ends of the inner and outer magnetic rotors 2 and 4 are at the same horizontal level as the upper ends of the middle magnetic rotor 6, i.e., when they are fully embedded. Each middle magnetic rotor 6 contains a temperature sensor. When the temperature sensor detects that the temperature of the middle magnetic rotor 6 has reached a threshold, the displacement platform can be used to displace the power mechanism and the inner and outer magnetic rotors axially, disengaging the magnetic coupling and stopping the pumping.

[0044] To transmit higher mechanical energy while reducing energy consumption, this invention employs a magnetic coupling method. An inner, outer, and middle magnetic rotor form a magnetically coupled power mechanism. The inner and outer magnetic rotors, after magnetic coupling, drive the middle magnetic rotor. The inner and outer magnetic rotors are detachably and sealed on a first positioning plate, while the middle magnetic rotor is detachably and sealed on a second positioning plate. A displacement platform on the power mechanism allows the inner, outer, and middle magnetic rotors to be in two separable structures. When the temperature of the magnetic rotor reaches a threshold, the displacement platform allows axial displacement of the power mechanism and the inner and outer magnetic rotors to disengage from the magnetic coupling, stopping pumping and preventing rotor failure at high temperatures. Furthermore, a high-efficiency water-cooling mechanism separates the axial power mechanism from the first and second positioning plates, thus separating the magnetic coupling section from the high-temperature axial centrifugal pump. The magnetic rotor is separated from the central shaft by a high-thermal-resistance second positioning plate, ensuring effective operation of the magnetic rotor even under high-temperature working conditions. Without involving dynamic seals, all static seals can be replaced with welding, resulting in excellent sealing performance, high safety, compact structure, high power density, and simple disassembly. The inner and outer magnetic rotor layers can be easily expanded to increase the number of layers, further improving the transmission power. This solves the problems of magnetic rotor failure at high temperatures, poor high-temperature resistance, and difficulty in stable long-term pumping in liquid metal pumping, while also achieving a cylindrical structure and reducing pump size.

[0045] This invention seals the inner magnetic rotor 2, outer magnetic rotor 4, and middle magnetic rotor 6, along with the axial power mechanism and support disk, within a separate cavity, isolating them from the motor and the inner and outer magnetic rotors. When the sensor detects that the magnetic rotor temperature reaches a temperature threshold, the motor and the inner and outer magnetic rotors can be axially displaced to disengage from the magnetic coupling state, stopping the pumping. A cooling mechanism is also included, providing higher heat dissipation efficiency to accommodate higher operating temperatures. The structure is simple, transmitting power via magnetic coupling, avoiding the use of dynamic sealing structures. The central shaft extends the distance between the axial centrifugal impeller, which is in long-term contact with the liquid working fluid, and the magnetic rotor. The positioning disk can be made of a high-strength, low-thermal-conductivity material, reducing heat transfer to the magnetic rotor interior via thermal conduction. Furthermore, a water-cooling jacket between the axial centrifugal impeller and the magnetic rotor efficiently removes heat conducted from below, ensuring effective operation of the magnetic rotor. This invention does not use bearings for positioning the central shaft, allowing it to adapt to higher operating temperatures and avoiding problems caused by liquid metal corrosion.

[0046] In this invention, the inner magnetic rotor, outer magnetic rotor, and middle magnetic rotor can be expanded to include more layers, adding multiple magnetic rotors to improve magnetic coupling and further increase transmission power. The magnetic coupling part is dynamically adjustable. The displacement table can control the position of the power mechanism toward the first positioning disk axially, thereby adjusting the displacement of the first positioning disk along its axial direction. The axial positions of the inner and outer magnetic rotors relative to the middle magnetic rotor can be adjusted at any time. By adjusting the embedding depth of the inner and outer magnetic rotors, the magnitude of the magnetic coupling torque between the inner and outer magnetic rotors and the middle magnetic rotor can be adjusted. In an emergency, the magnetic coupling can be terminated, disconnecting the power transmission.

[0047] In one specific embodiment, the inner magnetic rotor 2, outer magnetic rotor 4, and middle magnetic rotor 6 are each provided with multiple square holes along the circumferential direction, and each square hole is embedded with a permanent magnet. The permanent magnets can be distributed and arranged according to actual conditions. In this embodiment, the inner magnetic rotor 2, outer magnetic rotor 4, and middle magnetic rotor 6 are each provided with 36 square holes along the circumferential direction, and each square hole is embedded with a 30mm*10mm*5mm N58 permanent magnet. The N58 permanent magnet in the inner magnetic rotor 2 is encapsulated by the inner magnetic ring cover 13, the N58 permanent magnet in the outer magnetic rotor 4 is encapsulated by the outer magnetic rotor cover 8, and the N58 permanent magnet in the middle magnetic rotor 6 is encapsulated by the middle magnetic rotor upper cover 5 and the middle magnetic rotor lower cover 12. The arrangement of the magnetic rotors and the arrangement of the embedded permanent magnets are as follows: Figure 3 As shown, the filling and non-filling of each N58 permanent magnet represents the direction of magnetic pole arrangement. The alternating arrangement of N58 permanent magnets achieves a strong magnetic engagement effect. The magnetic coupling effect is better than that of structures using excitation coils, and the structure is simpler. The permanent magnets used are difficult to withstand stable operation at temperatures of several hundred degrees Celsius for extended periods. The magnetic coupling effect is better than that of structures using excitation coils, and the structure is simpler. It does not use precision parts such as bearings, nor does it use bearings to position the central shaft. Power is transmitted through magnetic coupling, avoiding the use of dynamic sealing structures. It can adapt to higher operating temperatures, operates reliably in high-temperature environments, and avoids problems caused by liquid metal corrosion.

[0048] In one specific embodiment, the lower end of the first positioning disk 1 is provided with a top cover 20, and a magnetic rotor housing 10 is detachably connected to the lower part of the top cover. A cooling mechanism is detachably connected to the lower part of the magnetic rotor housing 10. The second positioning disk 14 is disposed between the magnetic rotor housing 10 and the cooling mechanism. The top cover 20 is rotatably disposed at the upper end of the central shaft 26 via a rotating mechanism. The top cover 20 and the magnetic rotor housing 10 are fixedly connected by at least two third bolts 22 and are connected with a fourth sealing ring 24. The inner magnetic rotor 2, the outer magnetic rotor 4 and the magnetic rotor housing 10 are slidably connected. The middle magnetic rotor 6 is disposed inside the magnetic rotor housing 10. There is a sliding space between the first positioning disk 1 and the top cover 20. The position of the motor toward the axial direction of the first positioning disk 1 can be controlled by the displacement table, thereby adjusting the displacement of the first positioning disk along the axial direction of the first positioning disk 1. The axial position of the inner magnetic rotor 2 and the outer magnetic rotor 4 relative to the middle magnetic rotor 6 can be adjusted at any time.

[0049] In one specific embodiment, the rotating mechanism includes a spring 19, a sliding sleeve 21, and a first positioning sleeve 25. The sliding sleeve 21 is rotatably disposed at the upper end of the central shaft 26, and the spring 19 is disposed between the sliding sleeve 21 and the top cover 20. The magnetic rotor housing 10 is embedded in the first positioning sleeve 25, which rotates on the central shaft 26. More specifically, the inner wall of the first positioning sleeve 25 and the outer wall of the central shaft 26 are provided with corresponding first internal and external threads. By rotating the first positioning sleeve 25, the magnetic rotor housing 10 is positioned on the central shaft 26. The sliding sleeve 21 and the spring 19 are used to perform circumferential and axial positioning of the central shaft 26 without using bearings. The sliding sleeve 21 inside the top cover 20 achieves circumferential positioning, while the spring 19 ensures that the sliding sleeve 21 maintains appropriate axial pressure on the central shaft 26, preventing disengagement and excessive pressure that could lead to rapid wear.

[0050] In one specific embodiment, the magnetic rotor housing 10 is provided with adjacent upper and lower grooves. The inner magnetic rotor 2 is rotatably disposed on the upper groove, the middle magnetic rotor 6 is rotatably disposed on the lower groove, and the outer magnetic rotor 4 is rotatably disposed on the outer wall of the magnetic rotor housing 10. The inner magnetic rotor 2, the outer magnetic rotor 4 and the middle magnetic rotor 6 are all provided with a cover.

[0051] In one specific embodiment, the cooling mechanism includes a cooling section housing 15 and a water-cooled jacket 16. The upper end of the cooling section housing 15 and the lower end of the magnetic rotor section housing 10 are detachably connected, and a first sealing ring 11 is provided at the connection. The lower end of the cooling section housing 15 and the upper end of the axial flow power mechanism are detachably connected, and a second sealing ring 18 is provided at the connection. The water-cooled jacket 16 is fixed to the cooling section housing 15, and the cooling section housing 15 is rotatably mounted on the central shaft 26. The water-cooled jacket 16 is cooled by water circulation.

[0052] The upper end of the cooling section housing 15 and the lower end of the magnetic rotor section housing 10 are fixed together by multiple fourth bolts 9. The second positioning plate 14 is set between the upper end of the cooling section housing 15 and the lower end of the magnetic rotor section housing 10. The upper end of the cooling section housing 15 and the magnetic rotor section housing 10 position the second positioning plate 14. The water cooling jacket 16 achieves cooling after rotating around the central shaft 26, which has higher heat dissipation efficiency to adapt to higher operating temperatures.

[0053] In one specific embodiment, the axial flow power mechanism includes an axial flow centrifugal impeller 27 and an impeller section housing 29. The axial flow centrifugal impeller 27 is mounted on a central shaft 26 and housed within the impeller section housing 29. The upper end of the impeller section housing 29 and the lower end of the cooling section housing 15 are detachably connected, and a second sealing ring 18 is provided at the connection. The impeller section housing 29 has an outlet. The axial flow centrifugal impeller 27 rotates under the rotation of the central shaft 26, generating centrifugal force to transport the liquid metal. The upper end of the impeller section housing 29 and the lower end of the cooling section housing 15 are connected by a fifth bolt 17.

[0054] In one specific embodiment, the lower end of the impeller section housing 29 is provided with a second positioning sleeve 28, which is rotatably connected to the central shaft 26. The inner wall of the second positioning sleeve 28 and the outer wall of the central shaft 26 are provided with corresponding second internal and external threads. By rotating the second positioning sleeve 28, the impeller section housing 29 is positioned on the central shaft 26, thereby positioning the axial flow centrifugal impeller 27 on the central shaft 26. The water cooling jacket 16 and the second positioning disk 14 are clamped on the central shaft 26 by the first positioning sleeve 25 and the second positioning sleeve 28 for positioning.

[0055] In one specific embodiment, a support disk 32 is detachably provided below the impeller section housing 29 and a third sealing ring 31 is provided at the connection. The inner wall of the support disk 32 is rotatably connected to the lower end of the central shaft 26, and the lower end of the support disk 32 has fan-shaped openings arranged circumferentially. The impeller section housing 29 and the support plate 32 are connected by a through hole, allowing liquid metal to enter through the circumferentially arranged fan-shaped openings at the bottom of the support plate 32. After the axial centrifugal impeller 27 rotates, the liquid metal is drawn through the fan-shaped openings of the support plate 32 by the action of the axial centrifugal impeller 27. Centrifugal force causes the liquid metal to flow out through the orifices on the impeller section housing 29 and reach the pipe opening, thus realizing pumping. The support plate 32 and the impeller section housing 29 are connected by a seventh bolt, and the support plate 32 and the impeller section housing 29 are connected. When the central shaft 26 rotates, the axial centrifugal impeller 27 rotates in the impeller section housing 29. After the liquid metal flows in through the fan-shaped openings, the liquid metal is output by the centrifugal force of the axial centrifugal impeller 27.

[0056] During operation, the motor drives the first positioning disk 1 to rotate via a key. The inner magnetic rotor 2 and outer magnetic rotor 4 fixed on the first positioning disk 1, due to magnetic coupling, drive the middle magnetic rotor 6 nested in the center to rotate. Multiple layers of magnetic rotors can be added between the first positioning disk 1 and the second positioning disk 14 to improve the magnetic coupling effect and increase the upper limit of transmission power. The arrangement of the magnetic rotors and the arrangement of the internally embedded permanent magnets are as follows: Figure 3 As shown.

[0057] The rotation of the middle magnetic rotor 6 drives the rotation of the second positioning disk 14. The second positioning disk 14 and the central shaft 26 are connected by a keyway. The rotation of the second positioning disk 14 drives the rotation of the central shaft 26. The central shaft 26 is connected to the axial flow centrifugal impeller 27 by a keyway. The rotation of the central shaft 26 drives the axial flow centrifugal impeller 27 to rotate.

[0058] The central shaft 26 is positioned by being embedded in the sliding sleeve 22 and the support plate 32 at both ends. The second positioning plate 14 and the axial centrifugal impeller 27 are fixed together with the first positioning sleeve 25 and the second positioning sleeve 28. Power is transmitted from the magnetic coupling end to the centrifugal pump section via a keyway. The central shaft 26 and the cooling section housing 15 are fitted with a clearance fit in the cooling section. Due to the high surface tension of the liquid metal, it is difficult for the liquid metal to enter the upper magnetic coupling section from the lower centrifugal pump section. Simultaneously, any liquid metal that enters the gap can be cooled promptly by the water cooling mechanism, ensuring the normal operation of the magnetic coupling section.

[0059] The impeller section housing 29, together with the central shaft 26 and the axial flow centrifugal impeller 27, constitute a centrifugal pump. Liquid metal enters through the circumferentially arranged fan-shaped openings at the bottom of the support plate 32. Driven by the axial flow centrifugal impeller 27, centrifugal force causes the liquid metal to flow out through the orifices on the impeller section housing 29 and reach the pipe outlet, thus achieving pumping. The axial flow centrifugal impeller ensures minimal kinetic energy loss during the process of liquid metal being drawn in from the inlet below the support plate 32 and discharged from the pipe outlet on the impeller section housing 29.

[0060] It should be noted that the connection relationships of components not specifically mentioned in this invention are all assumed to be based on existing technology. Since they do not involve the inventive point and are commonly used in existing technology, the structural connection relationships are not described in detail.

[0061] It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described here to avoid redundancy. Although preferred embodiments of the invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this invention.

[0062] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An axial-flow high-temperature liquid metal magnetic pump, comprising a central shaft (26), characterized in that, Also includes: The first positioning disk (1) is rotatably mounted on the upper end of the central shaft (26) by a power mechanism. The first positioning disk (1) is coaxially and detachably provided with an inner magnetic rotor (2) and an outer magnetic rotor (4). The outer magnetic rotor (4) is located outside the inner magnetic rotor (2). The upper end of the first positioning disk (1) is connected to the output end of the power mechanism. The power mechanism is provided with a displacement stage. The second positioning disk (14) is detachably set below the lower first positioning disk (1). The second positioning disk (14) is fixed on the central shaft (26). The second positioning disk (14) is provided with a middle layer magnetic rotor (6). The middle layer magnetic rotor (6) rotates and nests between the inner layer magnetic rotor (2) and the outer layer magnetic rotor (4) to form a magnetic coupling power mechanism. After the inner layer magnetic rotor (2) and the outer layer magnetic rotor (4) generate magnetic coupling, they drive the middle layer magnetic rotor (6) to rotate. When the temperature of the middle layer magnetic rotor (6) reaches the temperature threshold, the inner layer magnetic rotor (2) and the outer layer magnetic rotor (4) are axially separated from the middle layer magnetic rotor (6) through the displacement table, and the magnetic coupling state is broken. The cooling mechanism is rotatably mounted on the central shaft (26) and located below the second positioning disk (14). An axial flow power mechanism is provided below the cooling mechanism. The axial flow power mechanism is rotatably mounted on the central shaft (26). The cooling mechanism is used to separate and cool the axial flow power mechanism and the magnetic coupling power mechanism.

2. The axial-flow high-temperature liquid metal magnetic pump according to claim 1, characterized in that, The inner magnetic rotor (2), outer magnetic rotor (4) and middle magnetic rotor (6) are provided with multiple square holes along the circumferential direction, and each square hole is embedded with a permanent magnet.

3. The axial-flow high-temperature liquid metal magnetic pump according to claim 1, characterized in that, The The lower end of the first positioning plate (1) is provided with a top cover (20), and the magnetic rotor housing (10) is detachably connected to the bottom of the top cover (20). The cooling mechanism is detachably connected to the bottom of the magnetic rotor housing (10). The second positioning plate (14) is located between the magnetic rotor housing (10) and the cooling mechanism. The top cover (20) is rotatably located at the upper end of the central shaft (26) through a rotating mechanism.

4. The axial-flow high-temperature liquid metal magnetic pump according to claim 3, characterized in that, The rotating mechanism includes a spring (19), a sliding sleeve (21), and a first positioning sleeve (25); the sliding sleeve (21) is rotatably disposed at the upper end of the central shaft (26), the spring (19) is disposed between the sliding sleeve (21) and the top cover (20), the magnetic rotor housing (10) and the first positioning sleeve (25) are rotatably connected, and the first positioning sleeve (25) is fixed on the central shaft (26).

5. The axial-flow high-temperature liquid metal magnetic pump according to claim 3, characterized in that, The magnetic rotor housing (10) is provided with adjacent upper and lower grooves. The inner magnetic rotor (2) is rotatably mounted on the upper groove, the middle magnetic rotor (6) is rotatably mounted on the lower groove, and the outer magnetic rotor (4) is rotatably mounted on the outer wall of the magnetic rotor housing (10). The inner magnetic rotor (2), the outer magnetic rotor (4) and the middle magnetic rotor (6) are all provided with caps.

6. The axial-flow high-temperature liquid metal magnetic pump according to claim 3, characterized in that, The cooling mechanism includes a cooling section shell (15) and a water-cooled jacket (16). The upper end of the cooling section shell (15) and the lower end of the magnetic rotor shell (10) are detachably connected and a first sealing ring (11) is provided at the connection. The lower end of the cooling section shell (15) and the upper end of the axial flow power mechanism are detachably connected and a second sealing ring (18) is provided at the connection. The water-cooled jacket (16) is fixed on the cooling section shell (15). The cooling section shell (15) is rotatably mounted on the central shaft (26).

7. The axial-flow high-temperature liquid metal magnetic pump according to claim 6, characterized in that, The axial flow power mechanism includes an axial flow centrifugal impeller (27) and an impeller section housing (29). The axial flow centrifugal impeller (27) is mounted on a central shaft (26) and is mounted inside the impeller section housing (29). The upper end of the impeller section housing (29) and the lower end of the cooling section housing (15) are detachably connected and a second sealing ring (18) is provided at the connection.

8. The axial-flow high-temperature liquid metal magnetic pump according to claim 7, characterized in that, The lower end of the impeller section housing (29) is provided with a second positioning sleeve (28), which is rotatably mounted on the central shaft (26).

9. The axial-flow high-temperature liquid metal magnetic pump according to claim 7, characterized in that, The impeller section housing (29) is detachably provided with a support plate (32) and a third sealing ring (31) is provided at the connection. The inner wall of the support plate (32) is rotatably connected to the lower end of the central shaft (26). The lower end of the support plate (32) is circumferentially arranged with fan-shaped openings.

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