Nuclear main pump

Abstract

The invention discloses a nuclear main pump which comprises a machine shell, a disc type motor, a cooling assembly, a pump shell and a stirring assembly, the machine shell is provided with a first containing cavity, and a first liquid inlet and a first liquid outlet are formed in the machine shell; the disc type motor comprises a rotating shaft, a stator module and rotor modules, the rotating shaft is arranged in the first containing cavity, the bottom of the rotating shaft is rotationally connected with the shell, the stator module is arranged in the middle of the rotating shaft, and the two rotor modules are arranged on the rotating shaft on the two sides of the stator module respectively; the cooling assembly comprises blades, a heat pipe and a heat exchanger, the blades are arranged on the sides, away from the stator module, of the two rotor modules respectively and connected with a rotating shaft, the heat pipe is embedded into the stator module, and the heat exchanger is arranged outside the machine shell and connected with the first liquid inlet and the second liquid outlet through pipelines to form a circulation pipeline; the pump shell is arranged on the machine shell and provided with a second containing cavity, and a second liquid inlet and a second liquid outlet are formed in the pump shell. The stirring assembly is arranged in the second containing cavity and connected with the rotating shaft.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of core equipment of nuclear power plant reactor cooling system, and specifically relates to a nuclear main pump. BACKGROUND

[0002] The nuclear main pump is the core equipment of the nuclear power plant reactor coolant system (RCP), and is responsible for driving the circulation of the coolant, removing the heat of the reactor and preventing the damage of the reactor core. The performance of the nuclear main pump is directly related to the safe and stable operation of the nuclear power plant. However, the existing nuclear main pump still has the following deficiencies: 1. The connection mode of the motor and the impeller of the traditional nuclear main pump is complex, resulting in large energy loss in the transmission process and low energy transmission efficiency. This not only causes waste of energy, but also increases the operation cost of the nuclear power plant; 2. The traditional nuclear main pump usually adopts an axial motor drive, and its cooling mode usually adopts a double water cooling system. The primary water directly flows between the stator and the rotor gap. However, since the stator winding cannot be directly contacted with the cooling water, an isolation sleeve is used to separate the stator and the rotor. This also causes the primary water cooling to be unable to effectively cool the stator, and a secondary water cooling system needs to be arranged on the stator and the casing, resulting in system redundancy and increasing the maintenance cost and risk.

[0003] In summary, the existing nuclear main pump has deficiencies in energy transmission and cooling technology, and a new structure of nuclear main pump needs to be designed to solve these problems and promote the efficient and safe development of the nuclear power generation industry. SUMMARY

[0004] The present application aims to provide a nuclear main pump, which aims to solve the technical problems of low energy transmission efficiency and poor cooling effect of the traditional nuclear main pump, so as to improve the overall performance and reliability of the nuclear main pump, reduce the operation cost, and ensure the safe and stable operation of the nuclear power plant.

[0005] To achieve the above technical purpose, the present application adopts the following technical scheme: A nuclear main pump, comprising: A casing having a first accommodating cavity and formed with a first liquid inlet and a first liquid outlet; A disc type motor comprising a rotating shaft, a stator module and a rotor module, the rotating shaft being arranged in the first accommodating cavity and rotationally connected to the bottom of the casing, the stator module being arranged in the middle of the rotating shaft, and two rotor modules being arranged on the rotating shaft on both sides of the stator module; A cooling assembly comprising paddles, heat pipes and a heat exchanger, the paddles being arranged on the side of the two rotor modules away from the stator module and connected to the rotating shaft, the heat pipes being embedded in the stator module, and the heat exchanger being arranged outside the casing and connected to the first liquid inlet and the second liquid outlet through a pipeline to form a circulating pipeline; A pump shell is arranged on the machine shell, and has a second accommodating cavity and a second liquid inlet and a second liquid outlet; An agitation assembly is arranged in the second accommodating cavity and connected with the rotating shaft, and rotates under the driving of the disc motor to drive the coolant to circulate.

[0006] In some embodiments, the rotor module and the paddle are integrally formed.

[0007] In some embodiments, the disc motor further comprises a bearing module, the bearing module comprises water-lubricated sliding bearings arranged outside the two rotor modules respectively, and a tilting pad thrust bearing embedded between the stator module and the rotating shaft.

[0008] In some embodiments, the nuclear main pump further comprises a magnetic coupling arranged on one side of the rotating shaft close to the pump shell, and the other end of the magnetic coupling is connected with the agitation assembly.

[0009] In some embodiments, the magnetic coupling comprises an inner end rotor and an outer end rotor, the outer end rotor is connected with the rotating shaft, the inner end rotor is connected with the agitation assembly, the outer side surface of the inner end rotor and the inner side surface of the outer end rotor are respectively arrayed with permanent magnets, and the inner end rotor and the outer end rotor are coupled and connected through the permanent magnets.

[0010] In some embodiments, the magnetic coupling further comprises an isolation sleeve arranged between the inner end rotor and the outer end rotor, for preventing the coolant in the second accommodating cavity from leaking into the first accommodating cavity.

[0011] In some embodiments, the agitation assembly comprises a connecting shaft connected with the disc motor and an impeller, the center of the impeller is sleeved on the connecting shaft, and the impeller rotates under the driving of the connecting shaft.

[0012] In some embodiments, the agitation assembly further comprises a flow guide arranged on the side of the impeller away from the connecting shaft, for defining the flow path of the coolant in the second accommodating cavity.

[0013] In some embodiments, the nuclear main pump further comprises a heat insulation member arranged at the connection between the pump shell and the machine shell.

[0014] Compared with the prior art, the beneficial effects of the present application mainly include: The nuclear main pump provided by the application adopts a mode that a disc motor is directly connected with an agitation assembly, energy transmission links are reduced, energy transmission efficiency is improved, energy is saved and cost is reduced; meanwhile, the design simplifies the structure, improves the integration degree and reliability of the nuclear main pump, and reduces the failure risk caused by a complex connection structure. In addition, the nuclear main pump integrates a double water cooling system of a traditional nuclear main pump into a single water cooling system, simplifies the system structure and reduces the risk of system damage; by arranging paddles at two ends of the disc motor and arranging a heat pipe in the middle of the disc motor, the cooling liquid in a circulating pipeline can directly or indirectly contact the rotor and the stator of the disc motor, heat generated by the rotor and the stator can be removed to the maximum extent, the motor overheating is effectively avoided, the service life of the motor is prolonged, equipment maintenance cost and downtime risk are reduced, and long-term stable operation of the nuclear main pump is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is an overall structural appearance view of the nuclear main pump described in the application; Figure 2 is a sectional view of Figure 1 ; Figure 3 is a structural schematic view of the stator module described in the application; Figure 4 is a sectional view of the rotor module described in the application; Figure 5 is a top view of the rotor module described in the application; Figure 6 is a top view of the heat pipe described in the application; Figure 7 is a sectional view of the heat pipe described in the application; Figure 8 is a structural schematic view of the water-lubricated sliding bearing described in the application; Figure 9 is a structural schematic view of the outer end rotor described in the application; Figure 10 is a structural schematic view of the inner end rotor described in the application; Figure 11 is a structural schematic view of the isolation sleeve described in the application; Figure 12 is a sectional view of the isolation sleeve described in the application.

[0016] Explanation of reference signs: 100, a casing, 101, a first containing cavity, 102, a first liquid inlet, 103, a first liquid outlet; 200, a pump casing, 201, a second containing cavity, 202, a second liquid inlet, 203, a second liquid outlet; 300, disc motor, 310, rotating shaft, 320, stator module, 321, stator core, 322, stator winding, 330, rotor module, 340, bearing module, 341, water lubricated plain bearing, 342, tilting pad thrust bearing; 400, cooling assembly, 410, paddle, 420, heat pipe; 500, stirring assembly, 510, connecting shaft, 520, impeller, 530, flow guide; 600, magnetic coupling, 610, inner end rotor, 620, outer end rotor, 630, isolating sleeve; 700, thermal insulation; 800, base. DETAILED DESCRIPTION

[0017] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0018] Please refer to Figure 1 and Figure 2 shown, the present application provides a nuclear main pump, comprising a casing 100, a pump shell 200, a disc motor 300, a cooling assembly 400 and a stirring assembly 500, the casing 100 has a first containing cavity 101 and is formed with a first liquid inlet 102 and a first liquid outlet 103; the pump shell 200 is detachably arranged on the casing 100, the pump shell 200 has a second containing cavity 201 and is formed with a second liquid inlet 202 and a second liquid outlet 203; the disc motor 300 comprises a rotating shaft 310, a stator module 320 and a rotor module 330, the rotating shaft 310 is arranged in the first containing cavity 101 and is rotatably connected with the casing 100 at the bottom, the stator module 320 is arranged in the middle of the rotating shaft 310, and two rotor modules 330 are arranged on the rotating shaft 310 on both sides of the stator module 320; the stirring assembly 500 is arranged in the second containing cavity 201, and the stirring assembly 500 is connected with the disc motor 300, specifically connected with the rotating shaft 310, the stirring assembly 500 can rotate under the driving of the disc motor 300 to drive the circulation of the coolant; the cooling assembly 400 comprises a paddle 410, a heat pipe 420 and a heat exchanger (not shown in the figure), the paddle 410 is arranged on the side of each rotor module 330 away from the stator module 320 and is connected with the rotating shaft 310, the heat pipe 420 is embedded in the stator module 320, and the heat exchanger is arranged outside the casing 100 and is connected with the first liquid inlet 102 and the second liquid outlet 103 through pipelines to form a circulation pipeline.

[0019] The nuclear main pump provided by the application integrates the double water cooling system of the traditional nuclear main pump into a single water cooling system, simplifies the system structure and reduces the risk of system damage; meanwhile, when the cooling liquid in the circulating pipeline enters the first containing cavity 101, the paddle 410 arranged on the upper end of the disc motor 300 can be used to stir the rotor to dissipate heat, when the cooling liquid flows to the stator in the middle, the heat pipe 420 can be used to assist in dissipating heat of the stator, and then when the cooling liquid flows to the paddle 410 at the lower end of the disc motor 300, the paddle 410 can be used to stir the rotor at the lower end to dissipate heat, so that the disc motor 300 can be cooled to the maximum extent, the overheating of the motor is effectively avoided, the service life of the motor is prolonged, the equipment maintenance cost and downtime risk are reduced, and the long-term stable operation of the nuclear main pump is ensured.

[0020] In addition, the disc motor 300 is adopted in the application, and the stirring assembly 500 is directly connected with the disc motor 300, so that a complex transmission mechanism is omitted, the energy transmission link is reduced, the energy transmission efficiency is improved, energy is saved and the cost is reduced; meanwhile, the structure is simplified, the integration degree and reliability of the nuclear main pump are improved, and the failure risk caused by the complex connection structure is reduced.

[0021] It should be noted that the pump shell 200 serves as the shell of the nuclear main pump, plays a role in containing and protecting the internal stirring assembly 500, and provides a flow channel for fluid, and the shape and structure design of the pump shell 200 has an important influence on the flow resistance and pressure distribution of the fluid; the stirring assembly 500 is a key component for realizing energy conversion of the nuclear main pump, and through high-speed rotation, the fluid obtains kinetic energy and pressure energy, so that the fluid is transported, and the shape, number and angle of the blades of the stirring assembly 500 directly affect the performance indicators such as the flow, lift and efficiency of the pump.

[0022] The specific structure of the nuclear main pump provided by the application will be described in detail below.

[0023] In one embodiment, the disc motor 300 includes a rotating shaft 310, a stator module 320 and a rotor module 330, the rotating shaft 310 is arranged in the first containing cavity 101 and rotationally connected with the machine shell 100 at the bottom, the stator module 320 is arranged in the middle of the rotating shaft 310, and two rotor modules 330 are arranged on the rotating shaft 310 on both sides of the stator module 320.

[0024] The paddle 410 is arranged on the side surface of each rotor module 330 away from the stator module 320 and rotationally connected with the rotating shaft 310, and the heat pipe 420 is arranged outside the stator module 320 and wound around the stator module 320.

[0025] In the technical scheme, the disc motor 300 adopts a certain double-rotation structure, the rotor modules 330 on both sides each contain a permanent magnet inside, and the upper surface and the lower surface of each rotor module 330 are respectively integrated with an impeller 410, so that the original connecting component is omitted, the power loss caused by mechanical friction is reduced, and the risk of damage is reduced.

[0026] In one of the embodiments, the rotor module 330 and the impeller 410 are in an integrated structure, and the material of the impeller 410 and the material of the rotor module 330 both have inertia energy storage characteristics, so that the flywheel structure in the traditional nuclear main pump is optimized.

[0027] In one of the embodiments, as shown in Figure 3 The stator module 320 includes a stator core 321 and a stator winding 322, and the stator winding 322 is embedded in the stator core 321.

[0028] In one of the embodiments, as shown in Figure 4 and Figure 5 The rotor module 330 includes a rotor, the rotor is embedded with a permanent magnet inside and is tightly embedded with a rotating shaft 310, and the rotor surface is integrated with an impeller 410.

[0029] In one of the embodiments, as shown in Figure 8 The disc motor 300 further includes a bearing module 340, the bearing module 340 includes a water-lubricated sliding bearing 341 and a tilting pad thrust bearing 342, the water-lubricated sliding bearing 341 is respectively arranged outside the two rotor modules 330, and the tilting pad thrust bearing 342 is embedded between the stator module 320 and the rotating shaft 310.

[0030] In the technical scheme, the water-lubricated sliding bearing 341 plays a role in supporting and reducing friction during rotation of the rotor, liquid lubrication is achieved by forming a lubricating oil film between the journal and the bearing, so as to reduce friction loss, improve mechanical efficiency and service life of the pump; the tilting pad thrust bearing 342 is specially used for bearing axial thrust generated during operation of the nuclear main pump, the tilting pad thrust bearing 342 can automatically adjust the inclination angle of the pad according to the change of the axial load, so as to ensure the bearing capacity and stability of the bearing and prevent the rotor from moving axially.

[0031] In one of the embodiments, as shown in Figure 6 and Figure 7 The heat pipe 420 is arranged outside the stator winding 322 and is a hollow cylindrical pipe, when a temperature difference is generated at both ends of the heat pipe 420, the liquid at the evaporation end will rapidly vaporize and carry heat to the condensation end at a very fast speed. The heat pipe 420 can quickly carry away the heat generated by the stator winding 322.

[0032] Meanwhile, in the technical solution, the rotor is directly soaked in the cooling liquid to improve the heat dissipation efficiency; the stator module 320 is externally provided with a shielding sleeve to separate the cooling liquid, and the shielding sleeve is used to quickly lead out the heat generated by the stator, and the shielding sleeve is made of a high-thermal-conductivity material.

[0033] In one of the embodiments, the nuclear primary pump further comprises a magnetic coupling 600, which is arranged on one side of the rotating shaft 310 close to the pump shell 200, and the other end of the magnetic coupling 600 is connected with the stirring assembly 500.

[0034] In one of the embodiments, as shown in Figure 9 and Figure 10 , the magnetic coupling 600 comprises an inner rotor 610 and an outer rotor 620, the outer rotor 620 is connected with the rotating shaft 310, the inner rotor 610 is connected with the stirring assembly 500, the outer side surface of the inner rotor 610 and the inner side surface of the outer rotor 620 are respectively arrayed with permanent magnets, and the inner rotor 610 and the outer rotor 620 are coupled and connected through the permanent magnets.

[0035] In one of the embodiments, as shown in Figure 11 and Figure 12 , the magnetic coupling 600 further comprises an isolation sleeve 630, which is arranged between the inner rotor 610 and the outer rotor 620, and the outer periphery of the isolation sleeve 630 is connected with the pump shell 200, and a static sealing connection structure is adopted between the isolation sleeve 630 and the lower end of the pump shell 200 during installation, so as to prevent the nuclear primary loop working medium from entering the motor and burning the motor to cause nuclear leakage when the power is accidentally cut off.

[0036] In the technical solution, the isolation sleeve 630 is a sealing structure, which can isolate the working medium (coolant) in the pump shell 200 from the magnetic coupling 600, so as to prevent the working medium from leaking and impurities from entering to affect the performance of the magnetic coupling 600. Further, the isolation sleeve 630 is made of a non-magnetic and corrosion-resistant material, and is preferably a double-layer composite design of a ceramic sleeve and a metal sleeve. The inner ceramic layer is resistant to high temperature, corrosion and has a low thermal conductivity, and the outer metal sleeve has high mechanical strength to withstand the vibration and pressure generated during the operation of the magnetic coupling, so as to ensure the stability of the isolation sleeve 630 during use, and at the same time, the magnetic transmission is not disturbed, and the pressure in the pump shell 200 and the corrosion of the medium can be resisted.

[0037] In one of the embodiments, the stirring assembly 500 comprises a connecting shaft 510 and an impeller 520, the connecting shaft 510 is connected with the disc motor 300, the center of the impeller 520 is sleeved on the connecting shaft 510, and the impeller 520 rotates under the driving of the connecting shaft 510.

[0038] In one embodiment, the stirring assembly 500 further comprises a flow guide 530 arranged on the side of the impeller 520 away from the connecting shaft 510 to define the flow path of the coolant in the second accommodating cavity 201. The arrangement of the flow guide 530 can orderly guide the fluid flowing out of the impeller 520, further convert the kinetic energy of the fluid into pressure energy, optimize the flow state of the fluid, reduce energy loss, and improve the overall hydraulic performance of the nuclear main pump.

[0039] In one embodiment, the nuclear main pump further comprises a thermal insulation member 700 arranged at the connection between the pump shell 200 and the machine shell 100. The thermal insulation member 700 can block the heat transfer of the pump shell 200 and the working medium to the magnetic coupling 600, avoiding the influence of high temperature on the magnetic performance and service life of the magnetic coupling 600.

[0040] In one embodiment, the nuclear main pump further comprises a base 800 on which the machine shell 100 is installed. The base 800 provides a stable installation foundation for the nuclear main pump, bears the weight of the pump body and its internal components, and various forces (such as vibration, axial force, and radial force) generated during operation, and its structural strength and rigidity have an important influence on the stability and reliability of the pump.

[0041] In one embodiment, the nuclear main pump further comprises an intelligent control system, which includes pressure sensors, temperature sensors, flow sensors, and a controller. The pressure sensors, temperature sensors, and flow sensors are used to collect data in real time. When it is detected that the operating state of the pump needs to be adjusted, the controller issues an instruction. At this time, the power supply system of the disc motor 300 adjusts the current to make the stator winding 322 generate a specific magnetic field, and the rotor drives the impeller to adjust the speed under the action of the magnetic field, so as to adapt to different operating conditions and ensure the efficient and stable operation of the nuclear main pump. The sensors can monitor various parameters such as pressure, temperature, flow, and vibration in real time during the operation of the nuclear main pump. By converting these physical quantities into electrical signals, the controller can provide accurate operating data to detect abnormal conditions of the pump in a timely manner and ensure the safe and stable operation of the pump. The controller can receive signals from the sensors, analyze and process them, and adjust the operating state of the nuclear main pump, such as the speed and power of the motor, according to the preset control strategy and algorithm, to adapt to different operating conditions. Cooling system. External heat exchanger: through heat exchange, the heat generated during the operation of the nuclear main pump is transferred to the external environment, realizing the cooling of the key components (such as the motor stator and rotor) in the pump, ensuring that the pump operates within an appropriate temperature range, and preventing damage or performance degradation of the components due to overheating.

[0042] The working principle of the nuclear main pump provided by the application is as follows: The stator winding 322 is connected to an alternating current, a rotating magnetic field is generated in the stator core 321, the magnetic field interacts with the permanent magnet group of the rotor module 330 through the stator shielding sleeve, and an electromagnetic torque is generated; the rotor module 330 rotates along the axial direction under the action of the torque, and the surface paddle 410 rotates synchronously to transmit mechanical energy to the fluid. The water-lubricated sliding bearing 341 supports the rotation of the rotor module 330 and reduces friction through the water film; the tilting pad thrust bearing 342 bears the axial force to ensure the stable rotation of the rotor module 330. The permanent magnets of the outer end rotor 620 of the magnetic coupling 600 and the permanent magnets of the inner end rotor 610 form a magnetic field coupling, and the torque is transmitted without contact to drive the rotation of the connecting shaft 510, and then the rotation of the impeller 520 is realized, so that the kinetic energy and pressure energy of the fluid are converted. The heat shield 700 blocks the heat transfer of the medium in the pump shell 200; the isolation sleeve 630 prevents the medium from leaking and ensures the effective transmission of the magnetic field, so that the medium in the pump is isolated from the outside. The heat generated by the stator module 320 is conducted out through the heat pipe 420, and the circulating water of the water-lubricated sliding bearing 341 carries away part of the heat of the rotor module 330 and the stator module 320, so as to maintain the stable temperature of the device and avoid demagnetization of the permanent magnet or overheating of the components. The intelligent control system monitors the pressure in the pump shell 200, the temperature of the stator module 320 and other parameters in real time, adjusts the current size of the winding to optimize the power output of the motor. When the pressure or temperature is abnormal, the running state is adjusted in time to ensure the safe and efficient operation of the nuclear main pump. The base 800 provides basic support, and the pump shell 200 and the machine shell 100 form a structural frame to ensure that the nuclear main pump remains stable during operation and reduces the influence of external interference.

[0043] In summary, the nuclear main pump provided by the application has the following beneficial effects: 1. Compact structure, high space utilization rate: The disc-type motor is designed in an integrated manner with the pump body, which greatly reduces the overall volume of the nuclear main pump, is more convenient to install and arrange in a limited space compared with the traditional structure, is especially suitable for nuclear power environments with strict requirements on equipment volume and integration, effectively improves the space utilization efficiency, and meets the installation requirements of special scenes; 2. Multiple protection, prolonging the service life of components: The medium leakage and heat interference are blocked by the sealing module (such as the isolation sleeve and the heat shield), and the impurities in the fluid are intercepted by the filtering structure, so that the core components such as the permanent magnet group and the rotor of the disc-type motor are prevented from being worn or corroded by impurities, the service life of the key components of the motor is significantly prolonged, and the maintenance cost and replacement frequency are reduced; 3. High-efficiency heat dissipation, stable and reliable operation: the application integrates the traditional nuclear main pump's double water cooling system into a single water cooling system, reducing the risk of system damage; at the same time, with the help of water lubricated sliding bearing circulating water system, heat pipe and other heat dissipation structures, a high-efficiency heat dissipation system is constructed to quickly export the heat generated by the disc motor stator and rotor operation, ensuring that the motor operates within a safe temperature range, maintaining stable electromagnetic performance, reducing the risk of demagnetization, insulation aging and other faults caused by overheating, improving the reliability and stability of long-term operation, and optimizing the cost of heat dissipation; 4. Intelligent regulation, energy saving and safety: the output power of the disc motor drive unit can be intelligently adjusted according to the fluid flow, automatically reducing the power when the flow is small to avoid energy waste; when the flow is large, the power is increased to meet the actual conveying demand. When the motor temperature is too high (such as the stator reaching the preset temperature), the current is automatically cut off, making the magnetic field strength zero and the rotor stop rotating, avoiding damage to the coil and other components due to overheating, achieving self-protection, and balancing energy saving operation and safety protection.

[0044] The specific embodiments of the application described above do not constitute a limitation on the scope of protection of the application. Any various other corresponding changes and modifications made in accordance with the technical concept of the application shall be included in the scope of protection of the claims of the application.

Claims

1. A nuclear main pump, characterized in that, include: A housing having a first receiving cavity and forming a first liquid inlet and a first liquid outlet; A disc motor includes a rotating shaft, a stator module, and a rotor module. The rotating shaft is disposed in the first receiving cavity and its bottom is rotatably connected to the housing. The stator module is disposed in the middle of the rotating shaft, and two rotor modules are respectively disposed on the rotating shaft on both sides of the stator module. The cooling assembly includes blades, heat pipes, and a heat exchanger. The blades are respectively disposed on the side of the two rotor modules away from the stator module and connected to the rotating shaft. The heat pipes are embedded in the stator module. The heat exchanger is disposed outside the housing and is connected to the first liquid inlet and the second liquid outlet through pipelines to form a circulation pipeline. A pump housing is disposed on the housing, the pump housing having a second receiving cavity and forming a second liquid inlet and a second liquid outlet; An agitator is disposed in the second receiving cavity and connected to the rotating shaft. The agitator rotates under the drive of the disc motor to drive the coolant to circulate.

2. The nuclear main pump according to claim 1, characterized in that, The rotor module and the blade are integrally formed.

3. The nuclear main pump according to claim 1, characterized in that, The disc motor also includes a bearing module, which includes a water-lubricated sliding bearing and a tilting pad thrust bearing. The water-lubricated sliding bearing is respectively disposed outside the two rotor modules, and the tilting pad thrust bearing is fitted between the stator module and the shaft.

4. The nuclear main pump according to claim 1, characterized in that, The nuclear main pump also includes a magnetic coupler, which is disposed on the side of the rotating shaft near the pump casing, and the other end of the magnetic coupler is connected to the agitation assembly.

5. The nuclear main pump according to claim 4, characterized in that, The magnetic coupler includes an inner rotor and an outer rotor. The outer rotor is connected to the rotating shaft, and the inner rotor is connected to the stirring assembly. Permanent magnets are arrayed on the outer surface of the inner rotor and the inner surface of the outer rotor, respectively. The inner rotor and the outer rotor are coupled together through the permanent magnets.

6. The nuclear main pump according to claim 5, characterized in that, The magnetic coupler also includes an isolation sleeve disposed between the inner rotor and the outer rotor to prevent coolant in the second receiving cavity from leaking into the first receiving cavity.

7. The nuclear main pump according to claim 1, characterized in that, The agitation assembly includes a connecting shaft and an impeller. The connecting shaft is connected to the disc motor, and the center of the impeller is sleeved on the connecting shaft. The impeller rotates under the drive of the connecting shaft.

8. The nuclear main pump according to claim 7, characterized in that, The agitation assembly further includes a flow guide disposed on the side of the impeller away from the connecting shaft, for defining the flow path of the coolant in the second receiving cavity.

9. The nuclear main pump according to claim 1, characterized in that, The nuclear main pump also includes a heat insulation component, which is disposed at the connection between the pump casing and the housing.

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