阅读说明：本技术 用于反应堆的主泵及反应堆 (A main pump and reactor for reactor ) 是由 郭志家 周寅鹏 张金山 杨红义 孙刚 刘兴民 彭朝晖 卫光仁 叶宇晨 于 2021-10-25 设计创作，主要内容包括：一种用于反应堆的主泵及反应堆。主泵包括：主轴,可转动地设置；叶轮,与主轴连接,能够随着主轴的转动而转动,以带动反应堆内的一回路冷却介质的流动；输送组件,与主轴可转动地连接,输送组件设置有进口和出口,一回路冷却介质自进口向出口流动。取消了相关技术中外部的泵壳结构,以主轴的旋转轴带动叶轮转动,进而使得一回路冷却介质自输送组件的开口流向输送组件的出口,在满足流体输送功能外,具有结构简单、拆装方便和易于远程对中的特点。(A main pump for a reactor and the reactor. The main pump includes: a main shaft rotatably provided; the impeller is connected with the main shaft and can rotate along with the rotation of the main shaft so as to drive a primary circuit cooling medium in the reactor to flow; and the conveying assembly is rotatably connected with the main shaft and is provided with an inlet and an outlet, and a primary loop cooling medium flows from the inlet to the outlet. The external pump shell structure in the related technology is cancelled, the rotating shaft of the main shaft drives the impeller to rotate, and then a loop cooling medium flows to the outlet of the conveying component from the opening of the conveying component, and the fluid conveying device has the characteristics of simple structure, convenience in disassembly and assembly and easiness in remote centering.)

1. A main pump for a reactor, comprising:

a main shaft rotatably provided;

the impeller is connected with the main shaft and can rotate along with the rotation of the main shaft so as to drive a primary circuit cooling medium in the reactor to flow;

and the conveying assembly is rotatably connected with the main shaft and is provided with an inlet and an outlet, and the primary loop cooling medium flows from the inlet to the outlet.

2. The main pump of claim 1,

the main shaft is connected with the driving assembly so as to drive the main shaft to rotate through the driving assembly.

3. The main pump of claim 2,

the driving assembly comprises a motor and a motor shaft, and the motor shaft is connected with the main shaft through a first connecting piece.

4. The main pump of claim 2, wherein the main shaft comprises:

the driving component is connected with the transmission component so as to drive the transmission component to rotate through the driving component;

and the rotating assembly is connected with the transmission assembly through a second connecting piece so as to rotate according to the rotation of the transmission assembly, and the rotating assembly is connected with the impeller.

5. A main pump according to claim 4, characterized in that the second connection is provided as a universal joint.

6. The main pump of claim 4, wherein the transmission assembly comprises:

the first transmission shaft is connected with the driving assembly;

and the second transmission shaft is connected with the first transmission shaft through a third connecting piece and is connected with the rotating assembly through the second connecting piece.

7. The main pump of claim 6, wherein said third connection is provided as a coupling.

8. The main pump of claim 6, wherein said rotating group comprises:

the first rotating shaft is connected with the second transmission shaft through the second connecting piece;

the second rotating shaft can be detachably connected to the first rotating shaft through a dismounting structure.

9. The main pump of claim 8,

the first transmission shaft and the second transmission shaft are concentrically connected;

the first rotating shaft and the second rotating shaft are concentrically connected.

10. The main pump of claim 8, wherein said first shaft is rotatably connected to said second drive shaft.

11. The main pump of claim 8, wherein the disassembly structure comprises:

the first connecting part is arranged on one of the first rotating shaft and the second rotating shaft and provided with a bulge;

the second connecting part is arranged on the other one of the first rotating shaft and the second rotating shaft, movably connected with the first connecting part and provided with a bayonet at a first position and a clamping part at a second position;

when the first connecting part moves forward relative to the second connecting part, the protrusion can move from the bayonet to the clamping part and is clamped with the clamping part, so that the first rotating shaft and the second rotating shaft are detachably connected;

when the first connecting part moves reversely relative to the second connecting part, the protrusion can be separated from the clamping part and separated from the bayonet, so that the first rotating shaft is separated from the second rotating shaft.

12. The main pump of claim 8, wherein the disassembly structure comprises:

the spline shaft is arranged on one of the first rotating shaft and the second rotating shaft;

the spline shaft is detachably connected with the spline sleeve;

the spline shaft is detachably connected with the spline sleeve, so that the first rotating shaft is detachably connected with the second rotating shaft.

13. The main pump of claim 8, wherein said second shaft is a stepped shaft, said second shaft comprising at least first and second stepped shafts located end to end, said first stepped shaft being connected to said first shaft.

14. The main pump of claim 13, further comprising:

and the support assembly is rotatably connected with the first stepped shaft through a bearing.

15. The main pump of claim 14, wherein the support assembly comprises:

the connecting pipe is rotatably connected with the first step shaft through the bearing, the inner wall of the connecting pipe is in contact with the circumferential outer wall of the bearing, and the axial lead of the connecting pipe is collinear with the axial lead of the first step shaft;

a support ring disposed at a right angle to the connection pipe, the connection pipe being disposed closer to the first rotation shaft than the support ring;

wherein the connecting pipe is connected with the supporting ring; or the connecting pipe and the supporting ring are integrally formed.

16. The main pump of claim 13, wherein the delivery assembly comprises:

the conveying pipe is provided with a containing cavity, the conveying pipe is provided with a first opening and a second opening, the containing cavity is communicated with the first opening and the second opening, at least part of the first rotating shaft is located in the containing cavity through the first opening, and the second opening is used for allowing the cooling medium of the primary circuit to flow out;

the annular plate is positioned between the conveying pipe and the second stepped shaft, and the inner wall of the annular plate is connected with the second stepped shaft through a shaft sleeve;

wherein the annular plate is connected with the conveying pipe; or the annular plate and the delivery pipe are integrally formed.

17. A reactor, comprising: the reactor comprises a container formed by a reactor container and a reactor top cover, and a cold-hot pool separator arranged in the container, and is characterized in that the reactor further comprises:

the collector plate is positioned below the cold and hot pool partition plate, and defines a collector cavity positioned between the cold pool area and the hot pool area together with the cold and hot pool partition plate and the reactor container;

the main pump of any one of claims 1 to 16, said main pump being connected to said stack head by a pump cover connection assembly, said impeller of said main pump being located in said manifold, said delivery assembly of said main pump being located in said cold pool region, said primary loop cooling medium flowing from said hot pool region to said manifold and through said delivery assembly to said cold pool region.

18. The reactor of claim 17, wherein the main pump includes a first drive shaft; the reactor further comprises: at least one shielding component is arranged along the axial lead of the first transmission shaft in sequence so as to limit the heat in the container.

19. The reactor of claim 17, wherein the main pump includes a support assembly coupled to the hot well basin separator plate, the support assembly being located in the hot well basin area.

20. The reactor of claim 17, wherein said delivery assembly is coupled to said collector plate.

Technical Field

The embodiment of the invention relates to the technical field of nuclear reaction, in particular to a main pump for a reactor and the reactor.

Background

A primary loop cooling medium main circulating pump (nuclear main pump for short) of a nuclear reactor is equipment with a rotatable reactor, is main equipment of a primary loop cooling medium system of the reactor, and has the main functions of removing gas when the system is filled with water and circularly heating before the reactor is started. In normal operation, circulation of a primary cooling medium is ensured to cool the core.

Disclosure of Invention

Embodiments of the present invention provide a main pump for a reactor. The method comprises the following steps: a main shaft rotatably provided; the impeller is connected with the main shaft and can rotate along with the rotation of the main shaft so as to drive a primary circuit cooling medium in the reactor to flow; and the conveying assembly is rotatably connected with the main shaft and is provided with an inlet and an outlet, and a primary loop cooling medium flows from the inlet to the outlet.

A reactor of an embodiment of the present invention includes: the container that is formed by heap container and heap top lid and set up the cold and hot pond baffle in the container, the reactor still includes: the collector plate is positioned below the cold-hot pool separator plate, and defines a collector chamber positioned between the cold pool area and the hot pool area together with the cold-hot pool separator plate and the stack container; the main pump of the embodiment is connected with the stack top cover through the pump cover connecting assembly, the impeller is located in the flow collecting cavity, the conveying assembly is located in the cold pool area, a primary loop cooling medium flows from the cold pool area to the flow collecting cavity, and then flows to the cold pool area through the conveying assembly.

The main pump for the reactor in the embodiment of the invention cancels an external pump shell structure in the related technology, and drives the impeller to rotate by the rotating shaft of the main shaft, so that a primary circuit cooling medium flows from the opening of the conveying assembly to the outlet of the conveying assembly.

Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a main pump for a reactor according to an embodiment of the present invention.

Fig. 2 is a partial sectional view of a main pump for a reactor according to an embodiment of the present invention.

And

fig. 3 is a schematic structural view of a reactor according to an embodiment of the present invention.

Description of the main element symbols:

10. a main pump; 20. a first connecting member; 30. a drive assembly; 31. a motor; 32. a motor shaft;

100. a main shaft; 110. a transmission assembly; 111. a first drive shaft; 112. a second drive shaft; 120. a rotating assembly; 121. a first rotating shaft; 122. a second rotating shaft;

200. an impeller;

300. a delivery assembly; 310. a delivery pipe; 311. an accommodating chamber; 320. an annular plate;

400. a second connecting member; 500. a third connecting member;

600. disassembling the structure; 610. a spline shaft; 620. a spline housing;

700. a support assembly; 710. a connecting pipe; 720. a support ring;

40. a reactor; 41. a stack container; 42. a stack top cover; 43. a cold-hot tank partition plate; 44. a collector plate; 45. a manifold; 46. the pump cover connecting assembly; 471. a cold pool area; 472. a hot well area; 48. a shielding assembly; 49. a reactor core.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Fig. 1 is a schematic structural diagram of a main pump 10 for a reactor 40 according to an embodiment of the present invention. Referring to fig. 1, a main pump 10 for a reactor 40 includes a main shaft 100, an impeller 200, and a delivery assembly 300.

The main shaft 100 is rotatably provided. The impeller 200 is connected to the main shaft 100 and is capable of rotating with the rotation of the main shaft 100 to drive the flow of a primary cooling medium in the reactor 40. The transport assembly 300 is rotatably connected to the main shaft 100, and the transport assembly 300 is provided with an inlet and an outlet from which a primary cooling medium flows.

Further, the main shaft 100 is rotatable around its axis.

Further, the impeller 200 and the main shaft 100 may be fixedly connected, for example, by means of a fixing pin or a welded or interference connection; it may also be detachably connected, for example, the impeller 200 may be connected to the main shaft 100 by a detachable means.

Further, the impeller 200 is rotatable with rotation of the main shaft 100, and the impeller 200 is fixed to the shaft about the axis of the main shaft 100. The impeller 200 and the main shaft 100 may be rotated synchronously, i.e., rotated through the same angle at the same time; the impeller 200 and the main shaft 100 may also be non-synchronously rotated, i.e. rotated through different angles at the same time. The rotational relationship between the impeller 200 and the main shaft 100 is not particularly limited as long as the main shaft 100 can rotate with the impeller 200.

Specifically, the impeller 200 may include a plurality of blades, and the main pump 10 rotates the impeller 200 to drive a primary cooling medium to flow from the inlet to the outlet of the delivery assembly 300.

Further, the conveying assembly 300 is rotatably connected to the main shaft 100, that is, the conveying assembly 300 and the main shaft 100 can rotate relatively. Therefore, the transport module 300 may be stationary and the main shaft 100 may be rotated, or the transport module 300 may be rotated and the main shaft 100 may be stationary.

The main pump 10 in the reactor 40 of the present embodiment eliminates an external pump housing structure in the related art, and the impeller 200 is driven to rotate by the rotation shaft of the main shaft 100, so that a loop cooling medium flows from the opening of the conveying assembly 300 to the outlet of the conveying assembly 300, and the main pump has the characteristics of simple structure and easy alignment.

Referring to fig. 1, the spindle 100 is connected to the driving assembly 30 to drive the spindle 100 to rotate by the driving assembly 30.

Further, the driving assembly 30 includes a motor 31 and a motor shaft 32, and the motor shaft 32 is connected to the main shaft 100 through the first connecting member 20.

Specifically, the first connecting member 20 may be provided as a magnetic coupling by which the motor shaft 32 is connected with the main shaft 100. Therefore, the motor 31, the motor shaft 32, the magnetic coupling, and the main shaft 100 are connected in sequence. The axis of the motor shaft 32 is collinear with the axis of the main shaft 100.

Referring to fig. 1, the spindle 100 includes a transmission assembly 110 and a rotation assembly 120

The transmission assembly 110 is connected to the driving assembly 30 through the first connecting member 20, so that the driving assembly 30 drives the transmission assembly 110 to rotate. The rotating assembly 120 is connected to the driving assembly 110 through a second connector 400 to rotate according to the rotation of the driving assembly 110, and the rotating assembly 120 is connected to the impeller 200. Therefore, the motor 31, the motor shaft 32, the first link 20, the transmission assembly 110, the second link 400, and the rotation assembly 120 are sequentially connected.

In particular, the second connector 400 may be provided as a universal joint. The universal coupling can not only compensate the problem of inaccurate centering caused by processing and mounting errors, but also resist the vibration and impact action, and ensure the functional reliability and the operational stability of the transmission assembly 110 and the rotating assembly 120 under the earthquake working condition.

Referring to fig. 1, the transmission assembly 110 includes a first transmission shaft 111 and a second transmission shaft 112.

The first transmission shaft 111 is connected to the driving assembly 30 through the first connecting member 20. The second transmission shaft 112 is connected to the first transmission shaft 111 through a third connector 500, and is connected to the rotation assembly 120 through a second connector 400. Accordingly, the motor 31, the motor shaft 32, the first connector 20, the first transmission shaft 111, the third connector 500, the second transmission shaft 112, the second connector 400, and the rotation assembly 120 are connected in sequence. The axial lead of the motor shaft 32, the axial lead of the first transmission shaft 111 and the axial lead of the second transmission shaft 112 are collinear.

Specifically, the third connector 500 is provided as a coupling.

Referring to fig. 1, the rotating assembly 120 includes a first rotating shaft 121 and a second rotating shaft 122.

The first rotating shaft 121 is connected to the second transmission shaft 112 through a second connector 400. The second rotating shaft 122 can be detachably connected to the first rotating shaft 121 through the detaching structure 600, while transmitting torque through a detachable device. Therefore, the motor 31, the motor shaft 32, the first connector 20, the first transmission shaft 111, the third connector 500, the second transmission shaft 112, the second connector 400, the first rotation shaft 121, the detachment structure 600, and the second rotation shaft 122 are connected in sequence. The axial lead of the motor shaft 32, the axial lead of the first transmission shaft 111, the axial lead of the second transmission shaft 112, the axial lead of the first rotating shaft 121 and the axial lead of the second rotating shaft 122 are collinear. The main pump 10 is a multi-section shaft combined structure, a pump shell structure in the traditional design is omitted, the structure is simple, the machining process of each shaft and connecting pieces is mature, and the manufacturing cost is low.

Further, the impeller 200 is connected to the second rotating shaft 122. The impeller 200 and the second rotating shaft 122 may be fixedly connected, for example, by a fixing pin or by welding or interference connection; alternatively, the impeller 200 and the second shaft 122 may be detachably connected, for example, by a detachable device.

Further, the axial length of the second rotating shaft 122, which rotates the impeller 200, is small, so as to improve the stability of the main pump 10 in operation.

The axial line of the first transmission shaft 111, the axial line of the second transmission shaft 112, the axial line of the first rotating shaft 121 and the axial line of the second rotating shaft 122 are collinear.

In some embodiments, first shaft 121 is rotatably coupled to second drive shaft 112. The axis of the first shaft 121 and the axis of the first shaft 121 may form an angle therebetween. The first rotating shaft 121 and the second rotating shaft 112 can be connected through a universal joint, when the transmission part of the main pump 10 shakes, the first rotating shaft 121 and the second rotating shaft 112 rotate relatively to resist vibration and impact, and the reliability and the operation stability of the functions of the transmission assembly 110 and the rotating assembly 120 under the earthquake working condition are guaranteed.

In some embodiments, the detachment structure 600 includes a first connection portion and a second connection portion.

The first connecting portion is disposed on one of the first rotating shaft 121 and the second rotating shaft 122, and the first connecting portion is provided with a protrusion. The second connecting portion is disposed on the other of the first rotating shaft 121 and the second rotating shaft 122, movably connected to the first connecting portion, and provided with a bayonet at a first position and an engaging portion at a second position. When the first connecting portion moves forward relative to the second connecting portion, the protrusion can move from the bayonet to the engaging portion and engage with the engaging portion, so that the first rotating shaft 121 and the second rotating shaft 122 are detachably connected; when the first connecting portion moves in the opposite direction relative to the second connecting portion, the protrusion can disengage from the engaging portion and disengage from the bayonet, so that the first rotating shaft 121 is separated from the second rotating shaft 122

Fig. 3 is a schematic structural diagram of a reactor 40 according to an embodiment of the present invention. Referring to fig. 3, the dismounting structure 600 includes a spline shaft 610 and a spline housing 620. The spline shaft 610 is disposed on one of the first rotating shaft 121 and the second rotating shaft 122; spline housing 620 is disposed on the other of first rotating shaft 121 and second rotating shaft 122, and spline shaft 610 and spline housing 620 are detachably connected. So as to detachably connect spline shaft 610 and spline sleeve 620, thereby realizing detachable connection of first rotating shaft 121 and second rotating shaft 122. Besides realizing convenient disassembly and assembly functions, the spline shaft 610 and the spline sleeve 620 can compensate thermal expansion displacement deformation when the main pump 10 runs.

In some embodiments, the second rotating shaft is a stepped shaft, and the second rotating shaft includes at least a first stepped shaft and a second stepped shaft located end to end, and the first stepped shaft is connected with the first rotating shaft.

Further, the diameter of the second rotating shaft gradually changes along the axial direction.

Referring to fig. 2, the main pump 10 further includes a support assembly 700. The support assembly 700 is rotatably coupled to the first step shaft by a bearing.

Further, the support assembly 700 is rotatably coupled to the first step shaft via a bearing, that is, the support assembly 700 and the first step shaft can rotate relative to each other. Therefore, the first stepped shaft may rotate while the support assembly 700 is stationary, and the first stepped shaft may also rotate while the support assembly 700 is stationary.

Further, the bearing is installed at a central position inside the support assembly 700.

Referring to fig. 1 and 2, the support assembly 700 includes a connection pipe 710 and a support ring 720.

The connecting pipe 710 is rotatably connected with the first step shaft through a bearing, the inner wall of the connecting pipe 710 is in contact with the circumferential outer wall of the bearing, and the axis of the connecting pipe 710 is collinear with the axis of the first step shaft. The support ring 720 is disposed at a right angle to the connection pipe 710, and the connection pipe 710 is disposed closer to the first rotation shaft 121 than the support ring 720. Wherein, the connecting pipe 710 is connected with the supporting ring 720; or the connection pipe 710 is integrally formed with the support ring 720.

Further, the connection pipe 710 is rotatably connected to the first step shaft through a bearing, that is, the connection pipe 710 and the first step shaft may rotate relatively. Therefore, the connection pipe 710 may be stationary and the first stepped shaft may rotate, or the connection pipe 710 may rotate and the first stepped shaft may be stationary.

Further, the connection pipe 710 may have a hollow cylindrical shape, and may be rotatably connected to the first step shaft by a bearing. The bearing is located between the connection pipe 710 and the first step shaft.

Further, the support ring 720 may be ring-shaped.

Fig. 2 is a partial cross-sectional view of the main pump 10 of fig. 1. Referring to fig. 2, the delivery assembly 300 includes a delivery tube 310 and an annular plate 320.

The conveying pipe 310 is formed with an accommodating cavity 311, the conveying pipe 310 is provided with a first opening and a second opening, the accommodating cavity 311 is communicated with the first opening and the second opening, at least part of the second rotating shaft 122 is located in the accommodating cavity 311 through the first opening, and the second opening is used for allowing a loop cooling medium to flow out. The annular plate 320 is located between the delivery pipe 310 and the second rotating shaft 122, and the inner wall of the annular plate 320 is connected with the second stepped shaft through a shaft sleeve. Wherein, the annular plate 320 is connected with the conveying pipe 310; or the annular plate 320 is integrally formed with the delivery tube 310.

Further, the bushing may include a stepped projection located between the annular plate 320 and the second stepped shaft.

Further, a sleeve is mounted centrally within the delivery block.

Specifically, the second rotating shaft 122 includes a first stepped shaft, a third stepped shaft and a second stepped shaft, which are connected in sequence, and the first stepped shaft is connected to the first rotating shaft 121. The diameters of the first stepped shaft, the third stepped shaft and the second stepped shaft can be different, the diameter of the third stepped shaft is larger than the diameters of the first stepped shaft and the second stepped shaft, the bearing is matched with the first stepped shaft, and the shaft sleeve is matched with the second stepped shaft so as to facilitate the installation of the bearing and the shaft sleeve. In addition, the impeller 200 may be fixedly connected to the third stepped shaft.

In summary, the bearings and the shaft sleeves are respectively disposed at two ends of the second rotating shaft 122 to stably support the second rotating shaft 122. In addition, the transmission assembly 110 and the first rotating shaft 121 only function to transmit torque and do not affect the rotation stability of the second rotating shaft 122 and the impeller 200, so that the second rotating shaft 122 has strong stability and the impeller 200 also has strong stability.

Because the flow velocity of the primary loop cooling medium is very small under the operation condition, the pressure loss is very small, and the impeller 200 can realize forced circulation of the primary loop cooling medium without high rotating speed. In the present embodiment, although the rotation torque of the main shaft 100 is transmitted through the multi-stage connection structure, the connection structure can satisfy the functional requirement without transmitting a large torque, so as to improve the heat generation and service life of each component of the main pump 10.

Referring to fig. 3, a reactor 40 includes a vessel formed by a reactor vessel 41 and a reactor head 42, and a hot and cold pool divider 43 disposed within the vessel the reactor 40 further includes a collector plate 44 and the main pump 10.

A collector plate 44 is positioned below the hot and cold sink partition 43 and, together with the hot and cold sink partition 43, the stack 41 defines a collector 45 positioned between the cold sink region 471 and the hot sink region 472. The main pump 10 of the above embodiment, the main pump 10 is connected to the stack head 42 by the pump cover connection assembly 46. The impeller 200 of the main pump 10 is located within the manifold 45. The delivery assembly 300 of the main pump 10 is positioned in the cold sump region 471, and a primary coolant flows from the cold sump region 472 to the manifold 45, and then through the delivery assembly 300 to the cold sump region 471.

Specifically, the primary cooling medium is located within a vessel that is a cell body boundary of the primary cooling medium.

Further, the cold-hot pool separator 43 divides the stack into an upper hot pool area 472 and a lower cold pool area 471 to improve thermal efficiency, and the cold-hot pool separator 43 forms a manifold 45 together with the manifold plate 44.

Further, the main pump 10 is fixedly connected with the stack top cover 42 through a pump cover connection assembly 46, and the connection is sealed through a fastener and a sealing element. The magnetic coupling is located at the most basic driving and pump cover connecting assembly 46, and the magnetic coupling is used for transmitting the rotating torque of the motor shaft 32 to the first transmission shaft 111, solving the problem of shaft seal leakage, realizing complete sealing and improving the safety performance of the reactor 40.

Further, the main pump 10 and the manifold 44 are both immersed in a primary cooling medium to improve the intrinsic safety of the reactor 40 and to reduce the overall size. A primary coolant medium is heated in the pool by the reactor core 49 components and flows upwardly into the hot pool region 472, then through the primary pump 10 into the cold pool region 471 and into the reactor core 49.

Further, under the action of the rotating impeller 200 of the main pump 10, the medium flows from the manifold 45 to the lower sump region 471 via the outlet of the main pump 10, and returns from below to the reactor core 49. Throughout the hot well region 472, the main pump 10 powers the impeller 200 to provide forced circulation of a primary coolant.

Further, the reactor 40 may be a pool lead bismuth reactor 40. The main pump 10 in the reactor 40 of the embodiment cancels an external pump case structure in the related art, the main shaft 100 of the main pump 10 adopts a sectional structure, is reasonably arranged in the reactor 40, forms a reasonable flow passage by using the cold-hot pool partition plate 43, and has the characteristics of simple structure, easy centering, convenient dismounting operation, reliable sealing and the like.

Referring to fig. 3, the main pump 10 includes a first transmission shaft 111. The reactor 40 also includes at least one shield assembly 48. At least one shield assembly 48 is disposed in series along the axis of the first drive shaft 111 to limit upward heat transfer, as well as upward neutron and gamma transfer, within the vessel.

Referring to fig. 3, the main pump 10 includes a support assembly 700, the support assembly 700 being coupled to the hot and cold well partition 43, the support assembly 700 being located in the hot well region 472. The support member 700 is kept stationary relative to the cold-hot pool partition 43 when the main shaft 100 is rotated. That is, the support assembly 700 does not rotate with the rotation of the main shaft 100.

Further, the support assembly 700 and the cold-hot basin separator 43 may be fixedly connected, for example, by welding.

In some embodiments, the second shaft 122 is coupled to the support assembly 700 and the transport assembly 300. The support assembly 700 is located between the drive assembly 30 and the delivery assembly 300, and when the drive assembly 30 starts to drive the main shaft 100 to rotate, the transmission assembly 110 transmits torque to the first rotating shaft 121 and further to the second rotating shaft 122 to which the impeller 200 is connected. Since the impeller 200 is used to drive a loop cooling medium to flow from the opening of the conveying assembly 300 to the outlet, the impeller 200 generates a lift force when rotating, but the lift force is transmitted to the bearing, and then acts on the supporting assembly 700 fixedly connected to the cold-hot pool partition 43 through the bearing, so as to avoid affecting the stability of the first rotating shaft 121.

Referring to fig. 3, a delivery assembly 300 is coupled to the collector plate 44. The transfer assembly 300 remains stationary relative to the collector plate 44 during rotational operation of the spindle 100. That is, the transfer assembly 300 does not rotate with the rotation of the main shaft 100.

Further, the delivery assembly 300 is fixedly attached to the collector plate 44, such as by welding.

When the main pump 10 of the present embodiment is installed in the reactor 40 or removed from the reactor 40, the rotating assembly 120, the impeller 200, and the delivery assembly 300 of the main pump 10 may be installed in advance on the hot and cold well partition 43 and the current collecting plate 44.

When the installation is needed, the stack top cover 42 and the stack container 41 can be connected, the transmission assembly 110 is moved to the corresponding position, and then the transmission assembly 110, the stack top cover 42 and the rotating assembly 120 are installed. Or the transmission assembly 110 may be connected to the stack top cover 42 through the pump cover connection assembly 46, and then the transmission assembly 110 and the stack top cover 42 are moved to the corresponding positions, and then the transmission assembly 110 and the rotation assembly 120 are installed. The second transmission shaft 112 and the first rotating shaft 121 realize the transmission and the detachable connection of the torque of the transmission assembly 110 and the torque of the rotating assembly 120 through the matching of the spline shaft 610 and the spline sleeve 620.

When disassembly is required, the transmission assembly 110 can be disassembled from the reactor top cover 42 and the rotating assembly 120 in sequence, then the transmission assembly 110 is taken out of the reactor 40, and finally the rotating assembly 120, the impeller 200 and the conveying assembly 300 are disassembled together with the cold and hot pool partition plates 43 and the flow collecting plates 44. It is also possible to remove the transmission assembly 110 and the rotating assembly 120, remove the transmission assembly 110 and the reactor head 42 from the reactor 40, and remove the rotating assembly 120, the impeller 200, and the transport assembly 300 together with the hot and cold tank partitions 43 and the current collecting plates 44.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

In the description herein, references to the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.