Axial-flow type high-temperature liquid metal magnetic drive pump

Abstract

The invention discloses an axial-flow type high-temperature liquid metal magnetic drive pump, and belongs to the technical field of magnetic drive pumps. Comprising a first positioning disc rotationally arranged at the upper end of a center shaft through a rotating mechanism, an inner-layer magnetic rotor and an outer-layer magnetic rotor are coaxially and detachably arranged on the first positioning disc, the upper end of the first positioning disc is connected with a power mechanism, and a displacement table is arranged on the power mechanism; the second positioning disc is detachably arranged below the first positioning disc, the second positioning disc is fixed on the central shaft, a middle-layer magnetic rotor is arranged on the second positioning disc, and the middle-layer magnetic rotor is rotationally nested between the inner-layer magnetic rotor and the outer-layer magnetic rotor; and the cooling mechanism is arranged below the second positioning disc, and an axial flow power mechanism is arranged below the cooling mechanism. The problems that in liquid metal pumping, a magnetic rotor is prone to failure at the high temperature, not resistant to high temperature and difficult to stably pump for a long time are solved, a cylindrical structure is achieved, and the size of the pump is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic pumps, and in particular relates to an axial-flow high-temperature liquid metal magnetic pump. Background Art

[0002] The transportation of high-temperature liquid metal has a strong application background, such as high-temperature metal smelting in industrial production, liquid metal-cooled fast neutron reactors (sodium-cooled fast reactors and lead-cooled fast reactors, etc.) with great potential in the fourth-generation nuclear reactor system, cooling and heat dissipation of high-altitude and high-speed spacecraft, liquid metal thermal management devices in space stations, and efficient heat dissipation of electronic components.

[0003] In the past, liquid metal pumping was mostly done by pneumatic or direct mechanical transmission of power to the pump impeller. Pneumatic solutions have problems such as insufficient pumping time, flow pulsation, control lag, and the risk of high-pressure gas leakage, while direct mechanical transmission solutions will inevitably encounter dynamic sealing problems. For high-temperature liquid metal pumping, solving high-temperature dynamic sealing requires more special seals, which are complex in structure, high in cost, and have a short lifespan.

[0004] Existing magnetic pumps mainly have two modes: excitation coil drive and magnetic rotor drive, both of which can achieve non-contact power transmission. The first is to use an excitation coil to pass an alternating current to generate a rotating magnetic field, which drives the rotor to rotate, and then drives the impeller to rotate to achieve pumping. For example, two rotorless centrifugal liquid metal magnetic pumps designed by Quan Hui and Han Wei. The second is to arrange permanent magnet arrays on the inner and outer magnetic rotors respectively, and the inner and outer ring magnets are meshed. The rotation of one of the magnetic rotors drives the other magnetic rotor, and then drives the impeller to rotate to achieve pumping. For example, a vertical immersion liquid metal magnetic pump designed by Fang Jinghui and others and a magnetic pump for high-temperature liquid metal designed by Wen Languan and others.

[0005] However, when the temperature of the high-temperature liquid metal magnetic pump is raised to about 700°C, it is difficult to dissipate heat effectively, and the magnetic rotor is prone to failure at high temperatures. Summary of the invention

[0006] The purpose of the present invention is to propose an axial flow high temperature liquid metal magnetic pump, aiming to solve the problem that the magnetic rotor is easy to fail at high temperature during liquid metal pumping and it is difficult to pump stably for a long time, while achieving a cylindrical structure and reducing the size of the pump.

[0007] In order to achieve the above object, the technical solution of the present invention is:

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

[0009] A first positioning disk, which is rotatably arranged at the upper end of the central axis through a rotating mechanism, wherein an inner magnetic rotor and an outer magnetic rotor are coaxially and detachably arranged on the first positioning disk, wherein the outer magnetic rotor is located outside the inner magnetic rotor, and the upper end of the first positioning disk is connected to the output end of a power mechanism, and a displacement platform is arranged on the power mechanism;

[0010] A second positioning disk is detachably arranged below the first positioning disk, the second positioning disk is fixed on the central axis, a middle-layer magnetic rotor is arranged on the second positioning disk, the middle-layer magnetic rotor is rotatably nested between the inner-layer magnetic rotor and the outer-layer magnetic rotor, forming a magnetic coupling power mechanism; the inner-layer magnetic rotor and the outer-layer magnetic rotor are used to drive the middle-layer magnetic rotor to rotate after generating a magnetic coupling effect, and when the temperature of the middle-layer magnetic rotor reaches a temperature threshold, the inner-layer magnetic rotor and the outer-layer magnetic rotor are axially separated from the middle-layer magnetic rotor through a displacement table, and are out of a magnetic coupling state;

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

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

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

[0014] Furthermore, in the above-mentioned axial-flow high-temperature liquid metal magnetic pump, the rotating mechanism includes a spring, a sleeve and a first positioning sleeve; the sleeve is rotatably arranged at the upper end of the central axis, the spring is arranged between the 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 axis.

[0015] Furthermore, in the above-mentioned axial-flow high-temperature liquid metal magnetic pump, adjacent upper grooves and lower grooves are provided on the magnetic rotor shell, the inner magnetic rotor is rotatably set on the upper groove, the middle magnetic rotor is rotatably set on the lower groove, and the outer magnetic rotor is rotatably set on the outer wall of the magnetic rotor shell, and the inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor are all provided with covers.

[0016] Furthermore, in the above-mentioned 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 arranged on the central axis.

[0017] Furthermore, in the above-mentioned axial-flow high-temperature liquid metal magnetic pump, the axial-flow power mechanism includes an axial-flow centrifugal impeller and an impeller section casing, the axial-flow centrifugal impeller is arranged on the central axis, the axial-flow centrifugal impeller is arranged in the impeller section casing, the upper end of the impeller section casing and the lower end of the cooling section casing are detachably connected and a second sealing ring is provided at the connection.

[0018] Furthermore, in the above-mentioned axial-flow high-temperature liquid metal magnetic pump, a second positioning sleeve is provided at the lower end of the impeller section casing, and the second positioning sleeve is rotatably arranged on the central axis.

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

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

[0021] 1. In order to transmit mechanical energy with higher power while reducing energy consumption, the present invention transmits power through magnetic coupling. The inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor form a magnetic coupling power mechanism. After the inner magnetic rotor and the outer magnetic rotor generate magnetic coupling, they are used to drive the middle magnetic rotor to rotate. The inner magnetic rotor and the outer magnetic rotor are detachably sealed on the first positioning disk, and the middle magnetic rotor is detachably sealed on the second positioning disk. A displacement platform is provided on the power mechanism, so that the inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor are respectively in two separable structures. When the temperature of the middle magnetic rotor reaches the temperature threshold, the power mechanism and the inner magnetic rotor and the outer magnetic rotor can be axially displaced through the displacement platform to break away from the magnetic coupling state, stop pumping, and avoid the magnetic rotor from being easily ineffective at high temperature. Secondly, the axial flow power mechanism is separated from the first positioning disk and the second positioning disk by an efficient water cooling mechanism, so that the magnetic coupling section and the axial flow centrifugal pump working at high temperature are separated, and the magnetic rotor and the central axis are separated by a second positioning disk with high thermal resistance, so as to ensure that the magnetic rotor can still work effectively under high temperature working conditions.

[0022] 2. The magnetic coupling part in the present invention can be dynamically adjusted. The displacement table can be used to control the axial position of the power mechanism toward the first positioning disk, thereby adjusting the displacement of the first positioning disk along the axial direction of the first positioning disk. The axial position of the inner magnetic rotor and the outer magnetic rotor relative to the middle magnetic rotor can be adjusted at all times. The embedding depth of the inner magnetic rotor and the outer magnetic rotor can be used to adjust the magnetic coupling torque between the inner magnetic rotor and the outer magnetic rotor and the middle magnetic rotor. In an emergency, the magnetic coupling can be terminated by disengaging, thereby disconnecting the power transmission.

[0023] 3. In the present invention, the number of layers between the inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor can be expanded to increase the number of layers, thereby increasing the magnetic coupling effect and further increasing the transmitted power. An efficient water cooling mechanism is used to separate the axial flow centrifugal pump working at a high temperature below from the magnetic coupling section above. The magnetic rotor is separated from the central axis by a second positioning disk with high thermal resistance, thereby ensuring that the magnetic rotor can still work effectively under high-temperature working conditions.

[0024] 4. The first positioning plate, the second positioning plate, the cooling mechanism, the axial flow power mechanism and the supporting plate of the present invention do not involve dynamic seals, and all adopt sealing methods such as bolts, etc., 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 improving the transmitted power, realizing the cylindrical structure and reducing the size of the pump.

[0025] 5. The present invention embeds N52 permanent magnets in the inner, middle and outer three-layer magnetic rotors. The magnetic coupling effect is better than that of the structure using an excitation coil, and the structure is simpler. It does not use precision parts such as bearings, and does not use bearings to position the central axis. It transmits power through magnetic coupling, avoids the use of dynamic sealing structures, can adapt to higher operating temperatures, and can work reliably in high temperature environments, while avoiding the problems caused by liquid metal corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 2 It 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 It is a schematic diagram of the structure of the inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor of the present invention.

[0029] Figure 4 It is a schematic cross-sectional structural diagram of the support plate of the present invention.

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

[0031] Description of reference numerals:

[0032] 1. First positioning plate, 2. Inner magnetic rotor, 3. First bolt, 4. Outer magnetic rotor, 5. Middle magnetic rotor upper cover, 6. Middle magnetic rotor, 7. Second bolt, 8. Outer magnetic rotor cover, 9. Fourth bolt, 10. Magnetic rotor housing, 11. First sealing ring, 12. Middle magnetic rotor lower cover, 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. Center 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 DESCRIPTION

[0033] In order to enable those skilled in the art to better understand that the technical solution of the present invention can be implemented, the present invention is further described below in conjunction with specific embodiments and drawings. The described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present 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 body and a base; the pump body is provided with 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; the isolation sleeve is provided with a blast hood, the blast hood is provided with a bracket sleeve, one end of the bracket sleeve is fixedly connected to the base, the other end of the bracket sleeve is fixedly connected to the motor, and the outer magnetic rotor is fixedly connected to the inner side of the blast hood near one end of the base; the blast hood includes a barrel portion covered on the isolation sleeve. An end cap is located at one end of the barrel portion away from the base, the barrel portion is provided with a slot, the end cap is provided with a plurality of inclined holes that can blow air to the isolation sleeve after rotation, and the bracket sleeve is provided with a second slot. However, when the working fluid temperature is very high (700℃-800℃), the invented mechanism is difficult to operate. This is because: 1. The rotating 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 liquid metal temperature rises to about 700℃, the air cooling system in the structure is difficult to effectively dissipate heat, and the magnetic rotor fails and is difficult to work at high temperatures; 2. The magnetic pump structure includes a bearing component. When the operating temperature rises to 700℃, precision parts such as bearings can easily fail due to effects such as thermal deformation. At the same time, long-term high-temperature operation places high demands on bearings; 3. The axial position of the inner magnetic rotor relative to the outer magnetic rotor is fixed, and it cannot be quickly disengaged 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 a central axis, further comprising:

[0036] The first positioning disk 1 is rotatably arranged at the upper end of the central axis 26 through a rotating 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 on the outer side of 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 platform. The second positioning disk 14 is detachably arranged below the lower first positioning disk 1. The second positioning disk 14 is fixed on the central axis 26. The second positioning disk 14 is provided with a middle magnetic rotor 6. The middle magnetic rotor 6 is rotatably nested in the inner magnetic rotor 2 and the outer magnetic rotor 4. A magnetic coupling power mechanism is formed between the inner magnetic rotor 2 and the outer magnetic rotor 4; the inner magnetic rotor 2 and the outer magnetic rotor 4 generate magnetic coupling to 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 to break away from the magnetic coupling state; a cooling mechanism is rotatably arranged on the central axis 26 and is located below the second positioning disk 14, an axial flow power mechanism is arranged below the cooling mechanism, the axial flow power mechanism is rotatably arranged on the central axis 26, and the cooling mechanism is used to separate and cool the axial flow power mechanism and the magnetic coupling power mechanism.

[0037] In order to transmit mechanical energy with greater power while reducing energy consumption, the present invention transmits power through magnetic coupling. The inner and outer magnetic rotors, the outer magnetic rotors and the middle magnetic rotor form a magnetic coupling power mechanism. The inner and outer magnetic rotors generate magnetic coupling to drive the middle magnetic rotor to rotate. The inner and outer magnetic rotors are detachably sealed on a first positioning disk, and the middle magnetic rotor is detachably sealed on a second positioning disk. A displacement platform is provided on the power mechanism, so that the inner and outer magnetic rotors and the middle magnetic rotor are respectively in two separable structures. When the temperature of the magnetic transmission rotor reaches a temperature threshold, the power mechanism and the inner and outer magnetic rotors can be axially displaced through the displacement platform to break away from the magnetic coupling state, stop pumping, and avoid the magnetic rotor from being easily ineffective at high temperatures. Secondly, the axial flow power mechanism is separated from the first and second positioning disks by an efficient water cooling mechanism, so that the magnetic coupling section and the axial flow centrifugal pump working at high temperature are separated, and the magnetic rotor and the central axis are separated by a second positioning disk with high thermal resistance, so as to ensure that the magnetic rotor can still work effectively under high temperature working conditions.

[0038] The invention is further described below through specific examples.

[0039] Example 1

[0040] An axial flow high temperature liquid metal magnetic pump, such as Figure 1-5 As shown, including a central axis, further comprising:

[0041] The first positioning disk 1 is rotatably arranged at the upper end of the central axis 26 through a rotating 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 on the outer side of 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 platform. The second positioning disk 14 is detachably arranged below the lower first positioning disk 1. The second positioning disk 14 is fixed on the central axis 26. The second positioning disk 14 is detachably provided with a middle magnetic rotor 6. The middle magnetic rotor 6 is rotatably nested in the inner magnetic rotor A magnetic coupling power mechanism is formed between the inner magnetic rotor 2 and the outer magnetic rotor 4; the inner magnetic rotor 2 and the outer magnetic rotor 4 generate magnetic coupling to 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 to break away from the magnetic coupling state; a cooling mechanism is arranged below the second positioning disk 14, an axial flow power mechanism is arranged below the cooling mechanism, the axial flow power mechanism is rotatably arranged on the central axis 26, and the cooling mechanism is used to separate and cool the axial flow power mechanism and the magnetic coupling power mechanism.

[0042] In the present 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 inner magnetic rotor 2 and the outer magnetic rotor 4 rotate to generate a magnetic coupling effect, so that the middle magnetic rotor 6 rotates. After the second positioning disk 14 rotates, the central shaft 26 rotates, driving the axial flow power mechanism to rotate, and the liquid metal enters through the bottom of the support disk 32. The liquid working fluid 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 arranged on the first positioning disk 1, wherein the inner magnetic rotor 2 is fixed to the first positioning disk 1 by a first bolt 3, and the upper end of the outer magnetic rotor 4 is fixed to the first positioning disk 1 by a sixth bolt 23, and the lower ends of the inner magnetic rotor 2 and the outer magnetic rotor 4 are located above the second positioning disk 14, and 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 at the outermost side of the first positioning disk 1, and the middle magnetic rotor 6 is arranged between the inner magnetic rotor 2 and the outer magnetic rotor 4, and the lower end of the middle magnetic rotor 6 is fixed to the first positioning disk 1 by a sixth bolt 23. The second bolt 7 is fixed on the second positioning disk 14, and a middle-layer magnetic rotor upper cover 5 is provided on the upper end, and a middle-layer magnetic rotor lower cover 12 is provided at the connection between the middle-layer magnetic rotor 6 and the second positioning disk 14; when the inner-layer magnetic rotor 2 and the outer-layer magnetic rotor 4 rotate, the rotation produces a magnetic coupling effect, so that the middle-layer magnetic rotor 6 rotates; the axial flow power mechanism is separated from the first positioning disk and the second positioning disk by a water cooling mechanism, and then the magnetic coupling section and the axial flow centrifugal pump working at high temperature are separated, and the magnetic rotor is separated from the central axis by a second positioning disk with high thermal resistance, ensuring that the magnetic rotor can still work effectively under high-temperature working conditions, and the water cooling mechanism realizes cooling after the central axis 26 rotates. Among them, a displacement platform is provided on the power mechanism, that is, a displacement platform is provided on the motor, and the displacement platform can be used to control the axial position of the motor toward the first positioning disk 1, thereby adjusting the displacement of the first positioning disk along the axial direction of the first positioning disk 1, and 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 all times. The magnetic coupling torque between the inner magnetic rotor 2 and the outer magnetic rotor 4 and the middle magnetic rotor 6 can be adjusted by the embedding depth of the inner magnetic rotor 2 and the outer magnetic rotor 4. When the inner magnetic rotor 2 and the outer magnetic rotor 4 are at the same horizontal line as the upper end of the middle magnetic rotor 6, that is, when the inner magnetic rotor 2 and the outer magnetic rotor 4 are fully embedded, the magnetic coupling torque is the largest. A temperature sensor is provided in the middle magnetic rotor 6. When the temperature sensor detects that the temperature of the middle magnetic rotor 6 reaches the temperature threshold, the power mechanism and the inner and outer magnetic rotors can be displaced axially through the displacement platform to break away from the magnetic coupling state and stop pumping.

[0044] In order to transmit mechanical energy with greater power while reducing energy consumption, the present invention transmits power through magnetic coupling. The inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor form a magnetic coupling power mechanism. The inner magnetic rotor and the outer magnetic rotor generate magnetic coupling to drive the middle magnetic rotor to rotate. The inner magnetic rotor and the outer magnetic rotor are detachably sealed on the first positioning disk, and the middle magnetic rotor is detachably sealed on the second positioning disk. A displacement platform is provided on the power mechanism, so that the inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor are respectively in two separable structures. When the temperature of the magnetic transmission rotor reaches the temperature threshold, the power mechanism and the inner and outer magnetic rotors can be axially displaced through the displacement platform to break away from the magnetic coupling state, stop pumping, and avoid the magnetic rotor from being easily ineffective at high temperature. Secondly, the axial flow power mechanism is separated from the first positioning disk and the second positioning disk by an efficient water cooling mechanism, so that the magnetic coupling section and the axial flow centrifugal pump working at high temperature are separated, and the magnetic rotor and the central axis are separated by a second positioning disk with high thermal resistance, so as to ensure that the magnetic rotor can still work effectively under high temperature working conditions. It does not involve dynamic seals, and all static seals can be replaced by welding. It has good sealing, high safety, compact structure, high power density, and simple disassembly. The inner and outer magnetic rotors can be easily expanded to increase the number of layers in the later stage to further increase the power transmitted. It solves the problem that the magnetic rotor is easy to fail at high temperature, is not resistant to high temperature, and is difficult to pump stably for a long time in liquid metal pumping, and at the same time achieves the purpose of cylindrical structure and reducing the size of the pump.

[0045] The present invention seals the inner magnetic rotor 2, the outer magnetic rotor 4, the middle magnetic rotor 6, the axial flow power mechanism, and the support disk in a separate cavity, which is isolated from the motor and the inner and outer magnetic rotors. When the sensor detects that the temperature of the magnetic rotor reaches the temperature threshold, the motor and the inner and outer magnetic rotors can be axially displaced to break away from the magnetic coupling state and stop pumping; and a cooling mechanism is provided, which has a higher heat dissipation efficiency to adapt to higher working temperatures. The structure is simple, and power is transmitted by magnetic coupling, avoiding the use of a dynamic sealing structure. The distance between the axial flow centrifugal impeller that is in long-term contact with the liquid working medium and the magnetic rotor is lengthened through the central axis. The positioning disk can be made of a material with high strength and poor thermal conductivity, reducing the heat reaching the inside of the magnetic rotor by heat conduction. In addition, the water cooling jacket provided between the axial flow centrifugal impeller and the magnetic rotor can efficiently take away the heat conducted from below, and jointly ensure the effective operation of the magnetic rotor. The present invention does not use a bearing to position the central axis, can adapt to higher working temperatures, and avoids the problems caused by liquid metal corrosion.

[0046] In the present invention, the number of layers between the inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor can be expanded and increased, and multiple layers of magnetic rotors can be added to improve the magnetic coupling effect and further improve the transmitted power; the magnetic coupling part can be dynamically adjusted, and the position of the power mechanism toward the axial direction of the first positioning disk 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, and the axial position of the inner magnetic rotor and the outer magnetic rotor relative to the middle magnetic rotor can be adjusted at all times. The magnetic coupling torque between the inner magnetic rotor, the outer magnetic rotor and the middle magnetic rotor can be adjusted by the embedding depth of the inner magnetic rotor and the outer magnetic rotor, and in an emergency, the magnetic coupling can be terminated and the power transmission can be disconnected.

[0047] In a specific embodiment, the inner magnetic rotor 2, the outer magnetic rotor 4 and the middle magnetic rotor 6 are provided with a plurality of square holes along the circumferential direction, and each of the square holes 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, the outer magnetic rotor 4 and the middle magnetic rotor 6 are provided with 36 square holes along the circumferential direction, and each of the square holes is embedded with a 30mm*10mm*5mm N58 permanent magnet, wherein the N58 permanent magnet in the inner magnetic rotor 2 is packaged by the inner magnetic ring cover 13, the N58 permanent magnet in the outer magnetic rotor 4 is packaged by the outer magnetic rotor cover 8, and the N58 permanent magnet in the middle magnetic rotor 6 is packaged by the middle magnetic rotor upper cover 5 and the middle magnetic rotor lower cover 12. The arrangement between the magnetic rotors and the arrangement of the internally embedded permanent magnets are as follows: Figure 3 As shown in the figure, the filling and non-filling of each N58 permanent magnet represent the direction of the magnetic pole arrangement. The N58 permanent magnets are arranged alternately to achieve a strong magnetic meshing effect. The magnetic coupling effect is better than the structure using the excitation coil, and the structure is simpler. The permanent magnets used are difficult to withstand hundreds of degrees Celsius for a long time and work stably. The magnetic coupling effect is better than the structure using the excitation coil, and the structure is simpler. No precision parts such as bearings are used, and no bearings are used to position the central axis. Power is transmitted through magnetic coupling, avoiding the use of dynamic sealing structures, and can adapt to higher operating temperatures. It works reliably in high temperature environments and avoids problems caused by liquid metal corrosion.

[0048] In a specific embodiment, a top cover 20 is provided at the lower end of the first positioning disk 1, a magnetic rotor housing 10 is detachably connected to the bottom of the top cover, a cooling mechanism is detachably connected to the bottom of the magnetic rotor housing 10, a second positioning disk 14 is arranged between the magnetic rotor housing 10 and the cooling mechanism, and the top cover 20 is rotatably arranged at the upper end of the central axis 26 through 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, and the middle magnetic rotor 6 is arranged in the magnetic rotor housing 10. There is a sliding space between the first positioning disk 1 and the top cover 20. The axial position of the motor toward the first positioning disk 1 can be controlled by the displacement platform, and then the displacement of the first positioning disk along the axial direction of the first positioning disk 1 can be adjusted, and 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 all times.

[0049] In a specific embodiment, the rotating mechanism includes a spring 19, a sleeve 21 and a first positioning sleeve 25; the sleeve 21 is rotatably arranged at the upper end of the central shaft 26, the spring 19 is arranged between the sleeve 21 and the top cover 20, the magnetic rotor housing 10 is embedded in the first positioning sleeve 25, and the first positioning sleeve 25 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, and the magnetic rotor housing 10 is positioned on the central shaft 26 by rotating the first positioning sleeve 25. In order to position the central shaft 26 circumferentially and axially without using a bearing, the sleeve 21 and the spring 19 are used. The sleeve 21 in the top cover 20 realizes circumferential positioning, and the spring 19 ensures that the sleeve 21 always maintains appropriate axial pressure on the central shaft 26 to avoid separation and avoid excessive pressure and excessive wear.

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

[0051] In a specific embodiment, the cooling mechanism includes a cooling section housing 15 and a water cooling 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 cooling jacket 16 is fixed on the cooling section housing 15, and the cooling section housing 15 is rotatably arranged on the central shaft 26. The water cooling 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 fixedly connected by a plurality of fourth bolts 9. The second positioning disk 14 is arranged 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 disk 14. The water-cooling jacket 16 realizes cooling after rotating the central axis 26, and has higher heat dissipation efficiency to adapt to higher operating temperatures.

[0053] In a specific embodiment, the axial flow power mechanism includes an axial flow centrifugal impeller 27 and an impeller segment housing 29, wherein the axial flow centrifugal impeller 27 is arranged on the central shaft 26, and the axial flow centrifugal impeller 27 is arranged in the impeller segment housing 29, and the upper end of the impeller segment housing 29 and the lower end of the cooling segment housing 15 are detachably connected and a second sealing ring 18 is provided at the connection. An outflow port is provided on the impeller segment housing 29, and 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 segment housing 29 and the lower end of the cooling segment housing 15 are connected by a fifth bolt 17.

[0054] In a specific embodiment, the lower end of the impeller segment housing 29 is provided with a second positioning sleeve 28, and the second positioning sleeve 28 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, and the impeller segment housing 29 is positioned on the central shaft 26 by rotating the second positioning sleeve 28, thereby positioning the axial flow centrifugal impeller 27 on the central shaft 26, and 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 a specific embodiment, a support plate 32 is detachably provided below the impeller section casing 29 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, and the lower end of the support plate 32 has circumferentially arranged fan-shaped openings. The impeller section housing 29 and the support plate 32 are connected by a through hole, so that the liquid metal enters through the circumferentially arranged fan-shaped openings at the bottom of the support plate 32. After the axial flow centrifugal impeller 27 rotates, the liquid metal is sucked through the fan-shaped openings of the support plate 32 by the action of the axial flow centrifugal impeller 27. The centrifugal force causes the liquid metal to flow out through the orifices on the impeller section housing 29 to reach the pipe mouth, thereby realizing pumping; the support plate 32 and the impeller section housing 29 are connected by a seventh bolt, and the support plate 3 and the impeller section housing 29 are connected. When the central shaft 26 rotates, the axial flow centrifugal impeller 27 rotates in the impeller section housing 29. After the liquid metal flows in through the fan-shaped opening, the liquid metal is output by the centrifugal force of the axial flow centrifugal impeller 27.

[0056] During operation, the motor drives the first positioning disk 1 to rotate through the key. The inner magnetic rotor 2 and the outer magnetic rotor 4 fixed on the first positioning disk 1 will drive the middle magnetic rotor 6 nested in the center to rotate due to magnetic coupling. In addition, 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 the transmission power. The arrangement between the magnetic rotors and the arrangement of the permanent magnets embedded inside are as follows: Figure 3 shown.

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

[0058] The two ends of the central shaft 26 are embedded in the sleeve 22 and the support plate 32 for positioning. The second positioning plate 14 and the axial flow centrifugal impeller 27 are fixed in combination with the first positioning sleeve 25 and the second positioning sleeve 28. The power is transmitted from the magnetic coupling end to the centrifugal pump section in combination with the keyway. The central shaft 26 and the cooling section housing 15 are matched in the cooling section with a clearance fit. Due to the high surface tension of the liquid metal, it is difficult for the liquid metal to enter the upper magnetic coupling part from the lower centrifugal pump part. At the same time, the liquid metal entering the gap can also be cooled in time by the water cooling mechanism to ensure the normal operation of the magnetic coupling part.

[0059] The impeller section housing 29, the central shaft 26 and the axial flow centrifugal impeller 27 together form a centrifugal pump. Liquid metal enters through the circumferentially arranged fan-shaped openings at the bottom of the support plate 32. After the axial flow centrifugal impeller 27 acts, the centrifugal force causes the liquid metal to flow out through the openings on the impeller section housing 29 to the pipe opening, thereby achieving pumping. The axial flow centrifugal impeller can ensure that the kinetic energy loss of the liquid metal from the inlet below the support plate 32 to the pipe opening on the impeller section housing 29 is as low as possible.

[0060] It should be noted that the component connection relationships not specifically mentioned in the present invention are assumed to adopt the existing technology. Since they do not involve the invention point and are widely used in the existing technology, the structural connection relationships are not described in detail.

[0061] It should be noted that when the present invention involves a numerical range, it should be understood that the two 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 those in the embodiments, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0062] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended 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: A first positioning disk (1) is rotatably arranged at the upper end of the central axis (26) via a rotating mechanism, an inner magnetic rotor (2) and an outer magnetic rotor (4) are coaxially and detachably arranged on the first positioning disk (1), 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 a power mechanism, and a displacement platform is arranged on the power mechanism; A second positioning disk (14) is detachably arranged below the first positioning disk (1). The second positioning disk (14) is fixed on the central shaft (26). A middle magnetic rotor (6) is arranged on the second positioning disk (14). The middle magnetic rotor (6) is rotatably nested between the inner magnetic rotor (2) and the outer magnetic rotor (4) to form a magnetic coupling power mechanism. The inner magnetic rotor (2) and the outer magnetic rotor (4) generate magnetic coupling and drive the middle magnetic rotor (6) to rotate. When the temperature of the middle magnetic rotor (6) reaches a temperature threshold, the inner magnetic rotor (2) and the outer magnetic rotor (4) are axially separated from the middle magnetic rotor (6) through a displacement platform to break away from the magnetic coupling state. A cooling mechanism is rotatably arranged on the central shaft (26) and is located below the second positioning disk (14). An axial flow power mechanism is arranged below the cooling mechanism. The axial flow power mechanism is rotatably arranged 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), the outer magnetic rotor (4) and the middle magnetic rotor (6) are each provided with a plurality of square holes along the circumferential direction, and a permanent magnet is embedded in each of the square holes.

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

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

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

6. The axial flow high temperature liquid metal magnetic pump according to claim 3, characterized in that: The cooling mechanism comprises a cooling section housing (15) and a water cooling 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 cooling jacket (16) is fixed on the cooling section housing (15), and the cooling section housing (15) is rotatably arranged on a 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 comprises an axial flow centrifugal impeller (27) and an impeller segment casing (29); the axial flow centrifugal impeller (27) is arranged on a central shaft (26); the axial flow centrifugal impeller (27) is arranged in the impeller segment casing (29); the upper end of the impeller segment casing (29) and the lower end of the cooling segment casing (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: A second positioning sleeve (28) is provided at the lower end of the impeller section housing (29), and the second positioning sleeve (28) is rotatably arranged on the central shaft (26).

9. The axial flow high temperature liquid metal magnetic pump according to claim 7, characterized in that: A support plate (32) is detachably provided below the impeller section casing (29) 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), and the lower end of the support plate (32) has fan-shaped openings arranged circumferentially.

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