Liquid metal reactor main pump device

Abstract

The invention relates to a liquid metal reactor main pump device which comprises a pump shaft, an impeller, a guide bearing and a drainage structure, and the pump shaft is in transmission connection with the impeller. The guide bearing sleeve is arranged on the pump shaft and is in clearance fit with the pump shaft, a working groove is formed in the inner surface of the guide bearing sleeve, the drainage structure is provided with a drainage liquid inlet and a drainage liquid outlet, the drainage liquid inlet is communicated with the high-pressure side of the impeller, and the drainage liquid outlet is communicated with the working groove. According to the liquid metal reactor main pump device, the high-pressure medium generated on the high-pressure side of the impeller can be guided to the working groove in the inner side of the guide bearing through the drainage structure, and the pump shaft located in the guide bearing is supported, that is, the guide bearing can be subjected to static pressure lubrication through the high-pressure medium pressurized by the impeller, and the lubricating performance of liquid metal on the guide bearing is improved; the probability of dry friction caused by direct contact of a friction pair is reduced, and the service life of the pump shaft is prolonged.

Description

Technical Field

[0001] This application relates to the field of fluid machinery technology, and in particular to a main pump device for a liquid metal reactor. Background Technology

[0002] Liquid metal reactors (LMRs) are a fourth-generation nuclear reactor. Using liquid sodium, sodium-potassium alloys, or lead as coolants, LMRs offer advantages such as high safety and good neutron economy. They are also easily modularized and have broad application prospects. LMRs feature a pool-type design, with the main pump, steam generator, and core all integrated within the reactor pool container. The main pump serves as the sole power pump, providing power for the reactor cycle. In applications with large reactor pools or deep main pump insertion, a guide bearing is typically installed below the main pump to support its shaft rotation and improve operational stability.

[0003] However, due to the low viscosity and insufficient dynamic pressure effect of the reactor coolant, which is a liquid metal, its lubrication performance is poor. The guide bearing is prone to dry friction, resulting in a short service life of the guide bearing and affecting the continuous operation cycle of the main pump and the reactor. Summary of the Invention

[0004] Therefore, it is necessary to provide a liquid metal reactor main pump device that can improve the lubrication performance of liquid metal on the guide bearing, in order to address the above-mentioned problems.

[0005] A main pump device for a liquid metal reactor, comprising a pump shaft, an impeller, a guide bearing, and a flow diversion structure, wherein the pump shaft is drivenly connected to the impeller;

[0006] The guide bearing is sleeved on the pump shaft and forms a clearance fit. The inner surface of the guide bearing sleeve has at least one working groove. The flow-guiding structure has a flow-guiding inlet and a flow-guiding outlet. The flow-guiding inlet is connected to the high-pressure side of the impeller, and the flow-guiding outlet is connected to the working groove.

[0007] In one embodiment, the inner surface of the guide bearing further has a high-pressure groove, at least two feedback grooves, and at least two throttling platforms;

[0008] All of the throttling platforms are arranged circumferentially along the guide bearing, and each of the throttling platforms surrounds a feedback slot; each feedback slot is provided with a feedback hole; the high-pressure slot is located on the outside of the throttling platform.

[0009] The working tank is provided with at least two first liquid guiding holes, which are spaced apart along the circumference of the guide bearing in the same working tank; each first liquid guiding hole in the same working tank corresponds to a feedback hole; the first liquid guiding hole and its corresponding feedback hole are symmetrically arranged in the projection on the plane perpendicular to the axial direction of the guide bearing.

[0010] The guide bearing also has at least two flow channels, and each of the first liquid guiding holes in the same working tank is connected to its corresponding feedback hole through the flow channels.

[0011] The drain outlet is connected to the high-pressure tank, and is connected to the working tank in sequence through the high-pressure tank, the feedback tank, the feedback hole, the guide channel, and the first guide hole.

[0012] In one embodiment, the guide bearing has two working grooves; the two working grooves are symmetrically arranged on both sides of the feedback groove in the axial direction of the guide bearing; each working groove is provided with the same number of first liquid guiding holes as the feedback groove.

[0013] In one embodiment, the number of feedback slots is even, and all the feedback slots are arranged symmetrically in pairs with the axis of the guide bearing as the axis of symmetry; the first liquid guide holes in the same working slot are arranged symmetrically in pairs with the axis of the guide bearing as the axis of symmetry.

[0014] In one embodiment, the working tank includes at least two working sub-tanks, and a plurality of the working sub-tanks in the same working tank are evenly arranged along the circumference of the guide bearing, and each working sub-tank has a first liquid guiding hole.

[0015] In one embodiment, the inner surface of the guide bearing also has at least one low-pressure groove, the low-pressure groove having a drain hole connecting the inside and outside of the guide bearing, and each of the working grooves having the low-pressure groove on at least one side in the axial direction of the guide bearing.

[0016] In one embodiment, the guide bearing includes a bearing body and a sealing sleeve; the outer surface of the bearing body has a flow guide groove; the sealing sleeve is fitted onto the bearing body and covers the opening of each of the flow guide grooves, thus defining the flow guide channel together with the flow guide grooves.

[0017] In one embodiment, the guide groove is a spiral groove surrounding the axis of the guide bearing.

[0018] In one embodiment, the guide bearing has at least two working grooves; all the working grooves are spaced apart along the axial direction of the guide bearing; and the drain outlet communicates with all the working grooves.

[0019] In one embodiment, the high-pressure groove includes an annular groove region; the annular groove region is located at least on one side of the throttling platform in the axial direction of the guide bearing.

[0020] The drainage structure is an internal flow channel opened inside the pump shaft; the drainage inlet is located on the outer surface of the pump shaft on the high-pressure side of the impeller; the drainage outlet is located on the outer surface of the pump shaft inside the guide bearing and faces the annular groove area.

[0021] In one embodiment, the high-pressure groove includes two annular groove regions; in the axial direction of the guide bearing, the two annular groove regions are respectively located on both sides of the feedback groove;

[0022] The drainage structure has two drainage outlets, which are respectively oriented towards the two annular groove areas.

[0023] In one embodiment, the drainage structure includes a communicating axial segment and a radial segment;

[0024] The axial section extends along the axis of the pump shaft and forms the inlet at one end of the pump shaft located on the high-pressure side of the impeller;

[0025] The radial segment extends radially along the pump shaft and forms the drain outlet on the surface of the pump shaft located within the guide bearing.

[0026] In one embodiment, the guide bearing has a second liquid guiding hole, which connects the inner and outer sides of the guide bearing; the drainage structure is a conduit located outside the guide bearing, with the two ends of the conduit forming the drainage inlet and the drainage outlet, and the drainage outlet connecting to the second liquid guiding hole.

[0027] In one embodiment, the guide bearing has a second liquid guiding hole, which connects the inner and outer sides of the guide bearing; the liquid metal reactor main pump device also includes a pump casing assembly, and the impeller and the guide bearing are disposed in the pump casing assembly;

[0028] The drainage structure is a drainage channel opened inside the pump housing assembly, and the liquid inlet is located on the inner surface of the pump housing assembly on the high-pressure side of the impeller, and the drainage outlet is connected to the second liquid guide hole.

[0029] In one embodiment, the liquid metal reactor main pump assembly further includes a shielding structure fitted onto the pump shaft and made of radiation-shielding material.

[0030] In one embodiment, the liquid metal reactor main pump assembly further includes a dynamic seal and a mounting flange; the pump shaft passes through the mounting flange; the dynamic seal is fitted onto the pump shaft to seal the gap between the pump shaft and the mounting flange.

[0031] In one embodiment, the liquid metal reactor main pump assembly further includes a cooling structure that is in thermal contact with the dynamic seal.

[0032] In one embodiment, the main pump unit of the liquid metal reactor further includes a motor and a coupling; the motor is a variable frequency motor and is connected to the pump shaft through the coupling.

[0033] The aforementioned liquid metal reactor main pump unit and reactor can guide the high-pressure medium generated on the high-pressure side of the impeller to the working groove inside the guide bearing through the diversion structure, and support the pump shaft located inside the guide bearing. That is, the guide bearing can use the high-pressure medium pressurized by the impeller for hydrostatic lubrication, which improves the lubrication performance of the liquid metal on the guide bearing, reduces the probability of dry friction caused by direct contact of the friction pair, and extends the service life of the pump shaft. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a partial cross-sectional view of the reactor with a liquid metal reactor main pump unit in the first embodiment of this application.

[0036] Figure 2 for Figure 1 The diagram shows the structure of the main pump unit for the liquid metal reactor in the reactor.

[0037] Figure 3 for Figure 2 The diagram shows a partial structural schematic of the main pump unit of the liquid metal reactor.

[0038] Figure 4 for Figure 3 The diagram shows an enlarged view of the main pump unit of the liquid metal reactor at point A.

[0039] Figure 5 for Figure 3 The diagram shows a partial unfolded structure of the guide bearing in the main pump unit of the liquid metal reactor.

[0040] Figure 6 This is a schematic diagram of the bearing body of the guide bearing in another embodiment.

[0041] Figure 7 for Figure 6 The diagram shows the unfolded shape of the bearing body.

[0042] Figure 8 This is a schematic diagram of the bearing body of the guide bearing in another embodiment.

[0043] Figure 9 for Figure 8 The diagram shows a cross-sectional structure of the bearing body.

[0044] Figure 10 This is a partial structural schematic diagram of the main pump device for the liquid metal reactor in the second embodiment of this application.

[0045] Figure 11 for Figure 10 The diagram shows an enlarged view of the main pump unit of the liquid metal reactor at point B.

[0046] Figure 12 This is a partial structural schematic diagram of the main pump device for the liquid metal reactor in the third embodiment of this application.

[0047] Figure 13 for Figure 12 The diagram shows an enlarged view of the main pump unit of the liquid metal reactor at point C.

[0048] Explanation of reference numerals in the attached drawings: 100, Main pump unit for liquid metal reactor; 10, Motor; 20, Coupling; 30, Upper bearing; 40, Pump shaft; 50, Dynamic seal; 60, Mounting flange; 70, Shielding structure; 80, Bearing housing; 90, Guide bearing; 91, Working tank; 911, First liquid guide hole; 913, Working sub-tank; 92, High-pressure tank; 921, Second liquid guide hole; 922, Annular tank area; 93, Feedback tank; 931, Feedback. 94. Orifice; 95. Throttling platform; 96. Guide channel; 97. Bearing body; 98. Guide groove; 99. Low-pressure tank; 110. Inlet structure; 111. Baffle; 120. Impeller; 130. Guide vane; 140. Outlet structure; 160. Outer shell; 170. Drainage structure; 171. Drainage inlet; 172. Drainage outlet; 200. Reactor; 201. Pool container; 202. Top cover; 203. Internal components; 204. Core. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, where the term "and / or" appears, it merely describes the relationship between related objects and indicates that three relationships can exist. For example, A and / or B can represent the relationship between A and B: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates an "or" relationship between the related objects before and after it. Where the terms "first" and "second" appear, these terms are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, four, five, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0055] Please see Figures 1 to 3 One embodiment of this application provides a main pump unit 100 for a liquid metal reactor, including a motor 10, a coupling 20, an upper bearing 30, a pump shaft 40, a dynamic seal 50, a mounting flange 60, a shielding structure 70, a bearing housing 80, a guide bearing 90, an inlet structure 110, an impeller 120, guide vanes 130, and an outlet structure 140. Furthermore, the main pump unit 100 for a liquid metal reactor may also include a liquid level display, etc., which will not be elaborated here.

[0056] In one embodiment, the liquid metal reactor main pump device 100 is used in the reactor 200 as its main pump. Specifically, the reactor 200 is a liquid metal pool reactor 200, which has a pool container 201 for containing liquid metal, a top cover 202 covering the top of the pool container 201, in-core components 203 disposed in the pool container 201, and a core 204, etc. The liquid metal reactor main pump device 100 is the main pump for the liquid metal pool reactor 200.

[0057] The main pump unit 100 of the liquid metal reactor has a vertical structure. The following description, in conjunction with the reactor 200, describes the various structures of the main pump unit 100 from the top (motor 10) downwards: The coupling 20 connects the motor 10 to the upper part of the pump shaft 40, thus achieving a transmission connection. The dynamic seal 50 is located at the upper end of the pump shaft 40. The main pump unit 100 is mounted on the vessel flange of the reactor 200 via the mounting flange 60. The main pump unit 100 can be divided into two parts: the internal structure and the external structure of the pool vessel 201. The vessel flange is located on the top cover 202 of the reactor 200. The internal structure can be further divided into the gas phase space structure and the liquid medium structure. The shielding structure 70 is located at the boundary between the internal and external structures. A gas phase space exists between the liquid level and the shielding structure 70; the area above the liquid level is the gas phase space structure, and the area below the liquid level is the liquid medium structure. The liquid medium is equipped with a guide bearing 90, an inlet structure 110, an impeller 120, a guide vane 130, and an outlet structure 140.

[0058] The motor 10 is a variable frequency motor 10, which is connected to the pump shaft 40 via a coupling 20. The variable frequency motor 10 operates smoothly and is flexibly controlled, enabling stepless speed regulation and providing good controllability. In addition, the variable frequency motor 10 also has advantages such as low noise and high reliability.

[0059] The pump shaft 40 passes through the mounting flange 60 and enters the container from outside. The dynamic seal 50 is fitted onto the pump shaft 40 to seal the gap between the pump shaft 40 and the mounting flange 60. In this way, the dynamic seal 50 provides a dynamic seal for the pump shaft 40, achieving the airtightness of the gas phase space inside the pool container 201 and preventing the leakage of radioactive gas.

[0060] The main pump unit 100 for the liquid metal reactor also includes a cooling structure that is in thermal contact with the dynamic seal 50. The cooling structure can be located near the mounting flange 60, below the dynamic seal 50, and specifically between the mounting flange 60 and the dynamic seal 50. In this way, the cooling structure can conduct heat away from the dynamic seal 50, dissipating heat and reducing the installation and operating temperature of the dynamic seal 50.

[0061] The shielding structure 70 is fitted onto the pump shaft 40 and is made of radiation-shielding material. The shielding structure 70 is used at the connection point between the main pump unit 100 of the liquid metal reactor and the vessel flange of the reactor 200 for radiation protection. The radiation-shielding material can be, but is not limited to, serpentine or silicon carbide.

[0062] Pump shaft 40 is driven to drive impeller 120, thereby enabling impeller 120 to rotate. Guide bearing 90 serves as the bearing for the rotation of pump shaft 40, and is fixedly connected to shielding structure 70 via bearing seat 80 to be fixed relative to the vessel flange of reactor 200. During rotation, impeller 120 can draw in liquid medium from the low-pressure side, perform work on it to pressurize it, and generate high-pressure medium on its high-pressure side. The inlet structure 110 and outlet structure 140 of the liquid metal reactor main pump device 100 have a flow guiding function. Inlet structure 110 is used to guide the liquid medium to flow to impeller 120, and outlet structure 140 is used to guide the pressurized liquid medium to the outside, thereby driving the liquid medium to circulate and providing power for the reactor 200 circulation. Specifically, inlet structure 110 includes multiple baffles 111, which divide to form multiple channels for guiding impeller 120. The number of baffles 111 can be, but is not limited to, 4-6.

[0063] In addition, the liquid metal reactor main pump unit 100 also includes a housing 160, an impeller 120 and a guide vane 130 disposed inside the housing 160, and an inlet structure 110 and an outlet structure 140 may also be formed at both ends of the housing 160 in the height direction of the liquid metal reactor main pump unit 100.

[0064] Please refer to the following: Figure 4 and Figure 5 The liquid metal reactor main pump device 100 provided in one embodiment of this application further includes a flow diversion structure 170. A guide bearing 90 is sleeved on the pump shaft 40 and forms a clearance fit, and the inner surface of the guide bearing 90 sleeve has at least one working groove 91. The flow diversion structure 170 has a flow inlet 171 and a flow outlet 172. The flow inlet 171 is connected to the high-pressure side of the impeller 120, and the flow outlet 172 is connected to the working groove 91.

[0065] Understandably, the inlet 171 of the flow-guiding structure 170 is located below the guide bearing 90, and specifically in the area of ​​the housing 160 on the high-pressure side of the impeller 120, the guide vane 130, or the outlet structure 140, etc. Under the high pressure drive of the high-pressure side of the impeller 120, the liquid medium can enter the inlet 171 and flow along the flow-guiding structure 170, and flow into the working tank 91 from the outlet 172.

[0066] The inner diameter of the guide bearing 90 is larger than the outer diameter of the pump shaft 40. It is fitted onto the pump shaft 40 with a clearance fit, meaning there is a gap between the guide bearing 90 and the pump shaft 40. The inner surface of the guide bearing 90 faces the pump shaft 40, and the opening of the working groove 91 faces the pump shaft 40, with its depth direction being radial to the guide bearing 90. The liquid medium entering the working groove 91 is essentially located between the guide bearing 90 and the pump shaft 40. The guide bearing 90 is essentially a hydrostatic lubricated bearing. The liquid medium on the high-pressure side of the impeller 120 can be supplied to the guide bearing 90 through the diversion structure 170. After entering the working groove 91 to provide lubrication and support for the pump shaft 40, the liquid medium flows to the external low-pressure area.

[0067] The high-pressure medium generated on the high-pressure side of the impeller 120 in the aforementioned liquid metal reactor main pump unit 100 can be guided by the diversion structure 170 to the working groove 91 inside the guide bearing 90, and support the pump shaft 40 located within the guide bearing 90. In other words, the guide bearing 90 can fully utilize the high-pressure medium pressurized by the impeller 120 for hydrostatic lubrication. Even if the viscosity of the liquid metal is low and the dynamic pressure effect is insufficient, the guide bearing 90 can still be fully lubricated and supported by hydrostatic pressure, reducing the probability of dry friction due to direct contact between the friction pairs and extending the service life of the pump shaft 40. In addition, since the high-pressure medium used in the guide bearing 90 is taken from the high-pressure side of the impeller 120, and the pressure on the high-pressure side of the impeller 120 and the load on the pump shaft 40 are closely related to the rotational speed of the pump shaft 40, the guide bearing 90 naturally has internal feedback capability and can adapt to changes in external load. Compared with conventional hydrostatic bearings, it does not require a dedicated throttling component, which helps to reduce the complexity of its structure.

[0068] In some embodiments, the guide bearing 90 has at least two working grooves 91. All the working grooves 91 are spaced apart along the axial direction of the guide bearing 90. A drain outlet 172 communicates with all the working grooves 91.

[0069] Understandably, each working tank 91 is connected to the drain outlet 172, which can receive the input liquid medium and provide support for the pump shaft 40.

[0070] Thus, the guide bearing 90 can provide support for different positions of the pump shaft 40 through the spaced working grooves 91, which helps to improve the uniformity of its axial support for the pump shaft 40, thereby improving the stability of the pump shaft 40 rotation.

[0071] In some embodiments, the inner surface of the guide bearing 90 further includes a high-pressure groove 92, at least two feedback grooves 93, and at least two throttling platforms 94. Understandably, the openings of the high-pressure groove 92 and the feedback grooves 93 face the pump shaft 40, and the groove depth is radial to the guide bearing 90.

[0072] All throttling platforms 94 are arranged circumferentially along the guide bearing 90, and each throttling platform 94 surrounds a feedback groove 93. Each feedback groove 93 is provided with a feedback hole 931. A high-pressure groove 92 is located outside the throttling platform 94. Understandably, the number of feedback grooves 93 is the same as the number of throttling platforms 94, and the feedback grooves 93 are spaced apart circumferentially along the guide bearing 90. The throttling platform 94 is located between the high-pressure groove 92 and the feedback groove 93, with the high-pressure groove 92 located on the outside of the throttling platform 94 and the feedback groove 93 located on the inside of the throttling platform 94. The liquid medium can only flow between the feedback groove 93 and the high-pressure groove 92 through the gap between the platform surface of the throttling platform 94 and the pump shaft 40, and is thus throttled.

[0073] Each working groove 91 is provided with at least two first liquid guiding holes 911, which are spaced apart along the circumference of the guide bearing 90. Each first liquid guiding hole 911 in the same working groove 91 corresponds to a feedback hole 931, and each feedback hole 931 has a corresponding first liquid guiding hole 911. Projected onto a plane perpendicular to the axial direction of the guide bearing 90, the first liquid guiding holes 911 and their corresponding feedback holes 931 are symmetrically arranged. In other words, all first liquid guiding holes 911 are provided corresponding to feedback holes 931, and each feedback hole 931 corresponds to at least one first liquid guiding hole 911. In the circumferential direction of the guide bearing 90, the first liquid guiding holes 911 and their corresponding feedback holes 931 are separated by an angle of 180°.

[0074] The guide bearing 90 also has at least two flow channels 95, and each of the first liquid guide holes 911 in the same working tank 91 is connected to its corresponding feedback hole 931 through the flow channels 95.

[0075] The outlet 172 is connected to the high-pressure tank 92, and then sequentially connects to the working tank 91 via the high-pressure tank 92, feedback tank 93, feedback hole 931, guide channel 95, and first guide hole 911. Understandably, the outlet 172 is not directly connected to the working tank 91. The liquid medium can flow between the high-pressure tank 92 and the feedback tank 93 via the throttling platform 94, and between the feedback tank 93 and the working tank 91 via the guide channel 95. In other words, the liquid medium flowing out of the outlet 172 can sequentially flow into each working tank 91 via the high-pressure tank 92, throttling platform 94, feedback tank 93, feedback hole 931, guide channel 95, and first guide hole 911.

[0076] Thus, when the pump shaft 40 shifts relative to the axis of the guide bearing 90 due to factors such as load changes, the distance between it and each throttling platform 94 changes, with the gap between it and the throttling platform 94 it is closest to decreasing and the gap between it and the throttling platform 94 it is furthest away increasing. Therefore, for the throttling platform 94 it is closest to, the pressure drop from the high-pressure tank 92 through the throttling platform 94 into the corresponding feedback tank 93 increases, and correspondingly, the pressure at the first liquid guide hole 911 corresponding to the feedback hole 931 decreases. For the throttling platform 94 it is closest to, the pressure drop from the high-pressure tank 92 through the throttling platform 94 into the corresponding feedback tank 93 decreases, and correspondingly, the pressure at the first liquid guide hole 911 corresponding to the feedback hole 931 increases. Because the feedback port 931 and the first liquid guide port 911 are 180° apart in the circumferential direction of the guide bearing 90, the pressure decreases at the first liquid guide port 911 away from the pump shaft 40 and increases at the first liquid guide port 911 closer to the pump shaft 40. This generates a pressure difference on the pump shaft 40 in the opposite direction of its offset, pushing the pump shaft 40 to eliminate the offset. In short, the guide bearing 90 can form a self-feedback relationship with the pump shaft 40, automatically correcting the pump shaft 40 and adapting to changes in external load.

[0077] In one embodiment, the inner surface of the guide bearing 90 has a first annular groove, and a throttling platform 94 is disposed within the annular groove, defining the first annular groove as a feedback groove 93 located inside it and a high-pressure groove 92 located outside it. A feedback hole 931 is disposed at the bottom of the feedback groove 93 and extends radially along the guide bearing 90. A first liquid guiding hole 911 is disposed at the bottom of the working groove 91 and extends radially along the guide bearing 90.

[0078] In some embodiments, the guide bearing 90 has two working grooves 91. The two working grooves 91 are symmetrically arranged on both sides of the feedback groove 93 along the axial direction of the guide bearing 90. Each working groove 91 has the same number of first liquid guiding holes 911 as the feedback groove 93.

[0079] In other words, each feedback hole 931 corresponds to one first liquid guide hole 911 in each of the two working grooves 91, and is connected to the two first liquid guide holes 911 respectively through the flow guide channel 95. Specifically, in the axial direction of the guide bearing 90, the two working grooves 91 are symmetrically arranged on both sides of the first annular groove.

[0080] Understandably, the feedback groove 93 is located in the middle of the guide bearing 90, and the two working grooves 91 are symmetrically arranged on the guide bearing 90.

[0081] Thus, when the pump shaft 40 deviates, a pressure difference opposite to the direction of deviation is generated in both spaced-apart working grooves 91, which together push the pump shaft 40 back to its original position. In addition, the guide bearing 90 has symmetrical working grooves 91 at both ends, and the bearing stiffness is consistent in the axial direction, which can reduce the deflection of the pump shaft 40 at the guide bearing 90.

[0082] In some embodiments, the number of feedback tanks 93 is n, and n is an even number. All feedback tanks 93 are arranged symmetrically in pairs with the axis of the guide bearing 90 as the axis of symmetry. The first liquid guide holes 911 of the same working tank 91 are arranged symmetrically in pairs with the axis of the guide bearing 90 as the axis of symmetry.

[0083] Understandably, all feedback holes 931 are also arranged symmetrically in pairs with the axis of the guide bearing 90 as the axis of symmetry. Specifically, 4≤n≤10, and n can be, but is not limited to, 4, 6, 8, 10, etc.

[0084] Thus, with the feedback grooves 93 set in pairs, the self-feedback formed by the guide bearing 90 and the pump shaft 40 is more accurate, which can better correct the offset of the pump shaft 40 and adapt to the load changes of the pump shaft 40.

[0085] In some other embodiments, n is an odd number, and all feedback grooves 93 are evenly spaced around the axis of the guide bearing 90. The first liquid guiding holes 911 of the same working groove 91 are evenly spaced around the axis of the guide bearing 90. Specifically, 3≤n≤10, and n can be, but is not limited to, 3, 5, 7, etc.

[0086] In some embodiments, the guide bearing 90 includes a bearing body 96 and a sealing sleeve. The outer surface of the bearing body 96 has a guide groove 961. The sealing sleeve is fitted onto the bearing body 96 and covers the opening of each guide groove 961, thus defining a guide channel 95 together with the guide groove 961.

[0087] Understandably, the flow channel 95 formed by the sealing sleeve and the flow channel 961 is sealed except for its connection with the feedback hole 931 and the first liquid guide hole 911, in order to prevent leakage of liquid medium.

[0088] In this way, the flow channel 961 transports liquid medium from the outside of the bearing body 96, and the sealing sleeve allows the liquid medium in the flow channel 961 to flow inside the channel without leaking out to the outside, which is less likely to affect other areas inside the bearing 90. In addition, the flow channel 961 is relatively easy to manufacture, and it is easy to ensure that the flow channel 95 is connected to the feedback hole 931 and the first liquid guiding hole 911.

[0089] Furthermore, the guide groove 961 is a spiral groove surrounding the axis of the guide bearing 90.

[0090] Thus, the flow resistance of the flow channel 95 formed by the flow guide groove 961 is lower, which helps to reduce the pressure loss of the liquid medium.

[0091] Specifically, each feedback port 931 can be connected to one first liquid guiding port 911 of each of the two working tanks 91 through two guide channels 961. The two guide channels 961 can extend in the same spiral direction to form a continuous spiral channel, or they can extend in opposite spiral directions (e.g., ...). Figure 6 and Figure 7 (As shown).

[0092] In other embodiments, the flow channel 95 may also be a channel formed inside the guide bearing 90 or a pipe located outside the guide bearing 90, as long as it can connect the feedback hole 931 and the first liquid guiding hole 911, without being specifically limited here.

[0093] In some embodiments, the working tank 91 includes at least two working sub-tanks 913, and the multiple working sub-tanks 913 in the same working tank 91 are uniformly arranged along the circumference of the guide bearing 90, and each working sub-tank 913 has a first liquid guiding hole 911.

[0094] In other words, each working tank 91 is a working tank group consisting of at least two working sub-tanks 913, and the liquid metal reactor main pump unit 100 has at least two groups of working tanks. All working tank groups are arranged sequentially along the axial direction of the guide bearing 90, and all working sub-tanks 913 of each working tank group are arranged sequentially along the circumferential direction of the guide bearing 90.

[0095] Understandably, each working sub-slot 913 corresponds to a feedback slot 93, and the number of working sub-slots 913 in each working slot 91 is equal to the number of feedback slots 93. The corresponding working sub-slots 913 and feedback slots 93 are spaced 180° apart circumferentially from each other on the guide bearing 90. The opening of each working sub-slot 913 faces the pump shaft 40, and its depth is radial to the guide bearing 90. A first liquid guide hole 911 is located at the bottom of the working sub-slot 913 and extends radially along the guide bearing 90.

[0096] Thus, each working sub-slot 913 has a first liquid guide hole 911 through which the liquid medium flows and supports the pump shaft 40. All working sub-slots 913 are evenly arranged along the circumference of the guide bearing 90, which helps to improve the uniformity of the axial support of the guide bearing 90 on the pump shaft 40.

[0097] In one embodiment, each working tank 91 includes four working sub-tanks 913, and correspondingly, the guide bearing 90 has four first liquid guiding holes 911, four throttling platforms 94, four feedback tanks 93, and four feedback holes 931. In other embodiments, the number of working sub-tanks 913 included in each working tank 91 may also be six (e.g., Figure 8 and Figure 9 As shown), 8, 10, etc., increasing the number of working sub-slots 913 can improve the uniformity of the load-bearing capacity of the guide bearing 90, enabling it to better withstand external loads at different angles.

[0098] In some embodiments, the inner surface of the guide bearing 90 further has at least one low-pressure groove 98, the low-pressure groove 98 is provided with a drain hole that connects the inside and outside of the guide bearing 90, and each working groove 91 is provided with a low-pressure groove 98 on at least one side in the axial direction of the guide bearing 90.

[0099] Understandably, the liquid medium can flow from the working tank 91 to the low-pressure tank 98 through the gap between the inner surface of the guide bearing 90 and the pump shaft 40. Correspondingly, a through hole is also provided on the bearing housing 80 so that the liquid flowing out of the drain hole can flow to the low-pressure area in the pool container 201.

[0100] In this way, the liquid medium in the working tank 91 can flow into the low-pressure tank 98 and flow from the drain hole of the low-pressure tank 98 to the external low-pressure area. The low-pressure tank 98 helps to increase the discharge path of the liquid medium in the working tank 91 and improve the smoothness of the flow of the liquid medium in the guide bearing 90.

[0101] Furthermore, the inner surface of the guide bearing 90 also has at least two low-pressure grooves 98, and the low-pressure grooves 98 are provided with drainage holes that connect the inside and outside of the guide bearing 90. Each working groove 91 is provided with a low-pressure groove 98 on at least one side of the guide bearing 90 in the axial direction.

[0102] Specifically, the inner surface of the guide bearing 90 has two low-pressure grooves 98, which are respectively located on the side of the two working grooves 91 away from the end face of the guide bearing 90.

[0103] In this way, the liquid medium in the working tank 91 can flow to both sides along the axial direction of the guide bearing 90, so that part of it flows directly from the guide bearing 90 to the external low-pressure area, and part of it flows into the low-pressure tank 98 and then flows from the drain hole of the low-pressure tank 98 to the external low-pressure area.

[0104] In one embodiment, the low-pressure groove 98 is a second annular groove. Along the axial direction of the guide bearing 90, two low-pressure grooves 98 are respectively located between the two working grooves 91 and the first annular groove. A drain hole is located at the bottom of the low-pressure groove 98 and extends radially along the guide bearing 90.

[0105] In some other embodiments, the guide bearing 90 may have only one working groove 91. In the axial direction of the guide bearing 90, the working groove 91 is disposed on one side of the feedback groove 93, and each working groove 91 is provided with the same number of first liquid guiding holes 911 as the feedback groove 93.

[0106] In the first embodiment, the high-pressure tank 92 includes an annular groove region 922 (e.g., Figure 9 (As shown). In the axial direction of the guide bearing 90, the annular groove region 922 is located at least on one side of the throttling platform 94.

[0107] The flow-guiding structure 170 is an internal flow channel opened inside the pump shaft 40. The flow-guiding inlet 171 is located on the outer surface of the pump shaft 40 on the high-pressure side of the impeller 120. The flow-guiding outlet 172 is located on the surface of the pump shaft 40 located inside the guide bearing 90 and faces the annular groove area 922.

[0108] Thus, the drainage structure 170 is formed inside the pump shaft 40, and a drainage inlet 171 and a drainage outlet 172 are formed at corresponding positions, without the need for additional structures and seals. Furthermore, the high-pressure tank 92 includes an annular groove region 922, and the drainage outlet 172 on the pump shaft 40 faces the annular groove region 922. That is, during the rotation of the pump shaft 40, the drainage outlet 172 always faces the high-pressure tank 92, and the liquid flowing out from the drainage inlet 171 will first enter the high-pressure tank 92.

[0109] Furthermore, the high-pressure tank 92 includes two annular groove regions 922. Axially, the two annular groove regions 922 are located on opposite sides of the feedback tank 93. Correspondingly, the drainage structure 170 has two drainage outlets 172, which face the two annular groove regions 922 respectively.

[0110] Understandably, in addition to the annular trough area 922, the high-pressure trough 92 may also include a portion located between adjacent throttling platforms 94 so as to supply liquid to the feedback trough 93 around the throttling platforms 94.

[0111] In this way, the flow-guiding structure 170 can guide the liquid medium to enter the two annular groove areas 922 of the high-pressure groove 92 simultaneously with the feedback groove 93 as the center of symmetry, so that the liquid medium flows more evenly.

[0112] Furthermore, the drainage structure 170 includes a communicating axial section and a radial section. The axial section extends along the axis of the pump shaft 40 and forms a drainage inlet 171 at one end of the pump shaft 40 located on the high-pressure side of the impeller 120. The radial section extends radially along the pump shaft 40 and forms a drainage outlet 172 on the outer surface of the pump shaft 40 located within the guide bearing 90.

[0113] Understandably, the drainage structure 170 includes at least two radial sections, and the drainage outlets 172 formed by the two radial sections are respectively oriented toward two annular groove areas 922.

[0114] Thus, when the pump shaft 40 rotates, the axial section extending along the axis of the pump shaft 40 can stably draw liquid from the high-pressure side of the impeller 120, and transport it along itself to the radial section and guide it to the annular groove area 922.

[0115] Please see Figure 10 and Figure 11In the second embodiment, the guide bearing 90 has a second liquid guiding hole 921, which connects the inner and outer sides of the guide bearing 90. The liquid metal reactor main pump assembly 100 also includes a pump casing assembly, with the impeller 120 and the guide bearing 90 disposed within the pump casing assembly. The flow diversion structure 170 is a flow diversion channel opened inside the pump casing assembly, with the inlet located on the inner surface of the pump casing assembly on the high-pressure side of the impeller 120, and the flow outlet 172 connected to the second liquid guiding hole 921.

[0116] Specifically, the pump casing assembly includes a housing 160, a bearing housing 80, an inlet structure 110, and an outlet structure 140. Understandably, the flow channel extends upward from the inner surface of the housing 160 on the high-pressure side of the impeller 120 within the housing 160 to the baffle 111, and then radially along the guide bearing 90 within the baffle 111 to the bearing housing 80, and further extends from within the bearing housing 80 to communicate with the second liquid guide hole 921. Understandably, the housing 160, bearing housing 80, inlet structure 110, and guide bearing 90 form a static seal at their interconnections using metal gaskets or metal O-rings, etc.

[0117] The second liquid guide hole 921 can be opened between two connected throttling platforms 94, and a second liquid guide hole 921 can be opened between each two adjacent throttling platforms 94.

[0118] Thus, the diversion structure 170 is located outside the pump shaft 40 and is directly fixed to the high-pressure tank 92, without needing to consider the positional changes caused by the rotation of the pump shaft 40.

[0119] Please see Figure 12 and Figure 13 In the third embodiment, the guide bearing 90 has a second liquid guiding hole 921, which connects the inner and outer sides of the guide bearing 90. The drainage structure 170 is a conduit located outside the guide bearing 90, with a liquid inlet 171 and a liquid outlet 172 at both ends, and the liquid outlet 172 is connected to the second liquid guiding hole 921.

[0120] Specifically, the second liquid guide hole 921 is located in the high-pressure tank 92, and a third liquid guide hole communicating with the second liquid guide hole 921 is laterally provided at the baffle 111. A fourth liquid guide hole communicating with the inside and outside of the housing 160 may be provided in the area downstream of the impeller 120. One end of the conduit serves as a liquid outlet 172 connected to the second liquid guide hole 921 via the third liquid guide hole, and the other end serves as a liquid inlet 171 connected to the fourth liquid guide hole. In other embodiments, the conduit may also pass through the pump housing assembly and communicate directly with the second liquid guide hole 921.

[0121] The number of conduits can be the same as the number of baffles 111. Each baffle 111 has a third liquid guiding hole, and the guide bearing 90 has a corresponding number of second liquid guiding holes 921. Each conduit is respectively set in a one-to-one correspondence with a baffle 111. In addition, the conduits can be fixed to the outer shell 160 by welding.

[0122] Thus, the processing difficulty of the drainage structure 170 is lower. It does not require large-scale internal openings in the pump shaft 40 and pump housing assembly. It only needs to be connected to the opening and conduit in a localized area.

[0123] The following describes the liquid metal reactor main pump device 100 of this application using a specific embodiment as an example: The inner surface of the guide bearing 90 has two working grooves 91, one upper and one lower. A high-pressure groove 92 is located between the two working grooves 91, and a low-pressure groove 98 is also provided between each working groove 91 and the high-pressure groove 92. Generally speaking, with the feedback groove 93 as the center, the two ends of the guide bearing 90 are arranged in sequence as follows: high-pressure groove 92, low-pressure groove 98, and working groove 91. Each working groove 91 includes four working sub-grooves 913 evenly arranged along the circumference of the guide bearing 90, and each working sub-grooves 913 has a first liquid guiding hole 911 at the bottom. Four throttling platforms 94 are evenly arranged around the guide bearing 90 inside the high-pressure tank 92. Each throttling platform 94 surrounds a feedback tank 93, and the bottom of the feedback tank 93 is provided with a feedback hole 931. The feedback hole 931 of each feedback tank 93 is connected to two first liquid guiding holes 911 spaced 180° apart through a guide channel 95 formed by a guide channel 961 and a sealing sleeve. The flow-guiding structure 170 is an internal flow channel opened inside the pump shaft 40, that is, the pump shaft 40 supplies liquid to the guide bearing 90.

[0124] During operation, the high-pressure liquid medium enters the upper and lower annular groove areas 922 of the high-pressure groove 92 inside the guide bearing 90 through the diversion structure 170 and fills the high-pressure groove 92. The high-pressure groove 92 surrounds the feedback groove 93, and the liquid medium inside is throttled by the throttling platform 94 around the feedback groove 93. The throttled liquid medium enters the feedback groove 93. Each feedback groove 93 has a feedback hole 931, through which the liquid medium in the feedback groove 93 is introduced into the guide groove 961 located on the outer surface of the bearing body 96, and the guide groove 961 is spiral-shaped. The guide groove 961 connects the working sub-grooves 913 of the upper and lower working grooves 91 that are 180° apart from the feedback groove 93. Each working sub-grooves 913 has a first liquid guiding hole 911, so that the liquid medium in the feedback groove 93 can be guided through the guide groove 961 and the first liquid guiding hole 911 to the working sub-grooves 913 in the upper and lower working grooves 91. The medium flowing out of the working tank 91 flows to both ends of the working tank 91, namely the ends of the guide bearing 90 and the low-pressure tank 98. The medium in the low-pressure tank 98 flows through the drain hole inside, passes through the bearing seat 80 of the pump housing assembly, and enters the low-pressure area in the pool container 201. The guide bearing 90 has two working tanks 91, one upper and one lower, each working tank 91 including four working sub-tanks 913, i.e., the number of working sub-tanks 913 is 4*2. Correspondingly, there are four feedback tanks 93, and the working sub-tanks 913 correspond to the feedback tanks 93.

[0125] The aforementioned liquid metal reactor main pump unit 100 features a guide bearing 90 that is a self-feedback hydrostatic lubricated bearing with intermediate liquid supply. High-pressure medium from the pump outlet supplies liquid to the guide bearing 90 through a drainage pipe, achieving both lubrication and support functions. This fully utilizes the high-pressure medium generated by the liquid metal reactor main pump unit 100, increasing the load-bearing capacity of the guide bearing 90. Overall, the guide bearing 90 has a symmetrical structure, with a high-pressure zone in the middle and low-pressure zones on both sides. When the high-pressure liquid medium is diverted into the guide bearing 90, the liquid medium in the working tanks 91 on both sides can freely flow from both ends of the guide bearing 90 to the low-pressure zone in the pool container 201, avoiding the difficulty of sealing the high-pressure medium at one or both ends of the guide bearing 90. Furthermore, the guide bearing 90 has an internal feedback function, automatically adjusting its clearance to adapt to changes in external load, avoiding the need for throttling components as in conventional hydrostatic bearings, which would increase the complexity of the guide bearing 90. The guide bearing 90 has symmetrical working grooves 91 at both ends, and the bearing stiffness is consistent in the axial direction, which can reduce the deflection of the pump shaft 40 at the guide bearing 90. In addition, the liquid metal reactor main pump unit 100 has the advantages of compact structure, stable operation, and wide range of design parameters.

[0126] This application also provides a reactor 200, including the above-described liquid metal reactor main pump assembly 100.

[0127] In one embodiment, the reactor 200 is a liquid metal pool reactor 200, and the liquid metal reactor main pump device 100 is the main pump for the liquid metal pool reactor 200. The coolant of the liquid metal pool reactor 200 can be, but is not limited to, lead-bismuth medium, etc.

[0128] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A main pump device for a liquid metal reactor, characterized in that, The main pump unit of the liquid metal reactor includes a pump shaft (40), an impeller (120), a guide bearing (90), and a flow diversion structure (170), wherein the pump shaft (40) is connected to the impeller (120) in a driving manner. The guide bearing (90) is sleeved on the pump shaft (40) and forms a clearance fit. The inner surface of the guide bearing (90) sleeve has at least one working groove (91). The drainage structure (170) has a drainage inlet (171) and a drainage outlet (172). The drainage inlet (171) is connected to the high-pressure side of the impeller (120), and the drainage outlet (172) is connected to the working groove (91).

2. The main pump device for a liquid metal reactor according to claim 1, characterized in that, The inner surface of the guide bearing (90) also has a high-pressure groove (92), at least two feedback grooves (93) and at least two throttling platforms (94). All of the throttling platforms (94) are arranged circumferentially along the guide bearing (90), and each of the throttling platforms (94) surrounds a feedback groove (93); each of the feedback grooves (93) is provided with a feedback hole (931); the high-pressure groove (92) is located on the outside of the throttling platform (94); Each of the working tanks (91) is provided with at least two first liquid guiding holes (911). The first liquid guiding holes (911) in the same working tank (91) are arranged at intervals along the circumference of the guide bearing (90). Each of the first liquid guiding holes (911) in the same working tank (91) corresponds to a feedback hole (931). The first liquid guiding hole (911) and its corresponding feedback hole (931) are symmetrically arranged in the projection on the plane perpendicular to the axial direction of the guide bearing (90). The guide bearing (90) also has at least two flow channels (95), and each of the first liquid guiding holes (911) in the same working tank (91) is connected to its corresponding feedback hole (931) through the flow channel (95). The drain outlet (172) is connected to the high pressure tank (92) and is connected to the working tank (91) in sequence through the high pressure tank (92), the feedback tank (93), the feedback hole (931), the guide channel (95) and the first guide hole (911).

3. The main pump device for a liquid metal reactor according to claim 2, characterized in that, The guide bearing (90) has two working grooves (91); in the axial direction of the guide bearing (90), the two working grooves (91) are symmetrically arranged on both sides of the feedback groove (93); each working groove (91) is provided with the same number of first liquid guiding holes (911) as the feedback groove (93).

4. The main pump device for a liquid metal reactor according to claim 2, characterized in that, The number of feedback tanks (93) is even, and all the feedback tanks (93) are arranged symmetrically in pairs with the axis of the guide bearing (90) as the axis of symmetry; the first liquid guide hole (911) in the same working tank (91) is arranged symmetrically in pairs with the axis of the guide bearing (90) as the axis of symmetry.

5. The main pump device for a liquid metal reactor according to claim 2, characterized in that, The working tank (91) includes at least two working sub-tanks (913). Multiple working sub-tanks (913) within the same working tank (91) are uniformly arranged along the circumference of the guide bearing (90), and each working sub-tank (913) has a first liquid guiding hole (911).

6. The main pump device for a liquid metal reactor according to claim 2, characterized in that, The inner surface of the guide bearing (90) also has at least one low-pressure groove (98), and the low-pressure groove (98) is provided with a drain hole that connects the inside and outside of the guide bearing (90), and each of the working grooves (91) is provided with the low-pressure groove (98) on at least one side of the guide bearing (90) in the axial direction.

7. The main pump device for a liquid metal reactor according to claim 2, characterized in that, The guide bearing (90) includes a bearing body (96) and a sealing sleeve; the outer surface of the bearing body (96) has a guide groove (961); the sealing sleeve is fitted onto the bearing body (96) and covers the opening of each of the guide grooves (961), and together with the guide grooves (961), defines the guide channel (95).

8. The main pump device for a liquid metal reactor according to claim 7, characterized in that, The guide groove (961) is a spiral groove surrounding the axis of the guide bearing (90).

9. The main pump device for a liquid metal reactor according to claim 2, characterized in that, The guide bearing (90) has at least two working grooves (91); all the working grooves (91) are spaced apart along the axial direction of the guide bearing (90); the drain outlet (172) is connected to all the working grooves (91).

10. The main pump device for a liquid metal reactor according to any one of claims 2-9, characterized in that, The high-pressure tank (92) includes an annular groove region (922); in the axial direction of the guide bearing (90), the annular groove region (922) is located at least on one side of the throttling platform (94); The drainage structure (170) is an internal flow channel opened inside the pump shaft (40); the drainage inlet (171) is located on the outer surface of the pump shaft (40) on the high-pressure side of the impeller (120); the drainage outlet (172) is located on the outer surface of the pump shaft (40) inside the guide bearing (90) and faces the annular groove area (922).

11. The main pump device for a liquid metal reactor according to claim 10, characterized in that, The high-pressure groove (92) includes two annular groove regions (922); in the axial direction of the guide bearing (90), the two annular groove regions (922) are respectively located on both sides of the feedback groove (93); The drainage structure (170) has two drainage outlets (172), which are respectively oriented toward the two annular groove areas (922).

12. The main pump device for a liquid metal reactor according to claim 10, characterized in that, The drainage structure (170) includes a connected axial section and a radial section; The axial section extends along the axis of the pump shaft (40) and forms the inlet (171) at one end of the pump shaft (40) located on the high-pressure side of the impeller (120). The radial segment extends radially along the pump shaft (40) and forms the drain outlet (172) on the surface of the pump shaft (40) located within the guide bearing (90).

13. The main pump device for a liquid metal reactor according to any one of claims 1-9, characterized in that, The guide bearing (90) has a second liquid guiding hole (921), which connects the inner and outer sides of the guide bearing (90); the drainage structure (170) is a conduit located outside the guide bearing (90), and the two ends of the conduit form the drainage inlet (171) and the drainage outlet (172), and the drainage outlet (172) connects to the second liquid guiding hole (921).

14. The main pump device for a liquid metal reactor according to any one of claims 1-9, characterized in that, The guide bearing (90) is provided with a second liquid guiding hole (921), which connects the inner and outer sides of the guide bearing (90); the liquid metal reactor main pump device also includes a pump casing assembly, in which the impeller (120) and the guide bearing (90) are located; The drainage structure (170) is a drainage channel opened inside the pump housing assembly, and the liquid inlet is located on the inner surface of the pump housing assembly on the high-pressure side of the impeller (120). The drainage outlet (172) is connected to the second liquid guide hole (921).

15. The main pump device for a liquid metal reactor according to claim 1, characterized in that, The liquid metal reactor main pump device also includes a shielding structure (70), which is sleeved on the pump shaft (40) and made of radiation-proof material.

16. The main pump device for a liquid metal reactor according to claim 1, characterized in that, The liquid metal reactor main pump device also includes a dynamic seal (50) and a mounting flange (60); the pump shaft (40) passes through the mounting flange (60); the dynamic seal (50) is sleeved on the pump shaft (40) to seal the gap between the pump shaft (40) and the mounting flange (60).

17. The main pump device for a liquid metal reactor according to claim 16, characterized in that, The liquid metal reactor main pump device also includes a cooling structure, which is in thermal contact with the dynamic seal (50).

18. The main pump device for a liquid metal reactor according to claim 1, characterized in that, The main pump unit of the liquid metal reactor also includes a motor (10) and a coupling (20); the motor (10) is a variable frequency motor (10) and is connected to the pump shaft (40) through the coupling (20).

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