A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump

Abstract

The application provides a circulating system equipped with a diving cylindrical linear induction electromagnetic pump, the electromagnetic pump is arranged in a container filled with liquid metal in a longitudinal direction, an inert gas tank is arranged for sealing, and a heat dissipation fin structure is arranged outside an external stator of the electromagnetic pump. The diving electromagnetic pump circulating system significantly reduces the floor area and weight of the liquid metal circulating loop, greatly improves the service life of the liquid metal circulating loop under different working conditions, and can effectively solve the requirements of equipment in robustness and light weight in extreme environments such as deep sea and deep space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic pump, in particular to a circulating system equipped with a submersible cylindrical linear induction electromagnetic pump. BACKGROUND

[0002] An electromagnetic pump is a device for transporting electrically conductive fluid, which can use the action of electric current and magnetic field in liquid metal to make the generated Lorentz force directly act on the liquid metal to make it flow. Electromagnetic pumps are widely used in aerospace industry, nuclear industry, metal production and chip cooling, etc. Electromagnetic pumps can be divided into conduction pumps and induction pumps according to the type of current supply, in which the source of current in conduction pumps is the conduction of liquid, and the source of current in induction pumps is the relative motion of magnetic flux and liquid; according to the type of power supply, they can be divided into direct current pumps and alternating current pumps (including single-phase and three-phase); according to the structure of the flow channel, they can be divided into cylindrical pumps, spiral pumps and planar pumps (including single-sided and double-sided). The annular linear induction pump (ALIP) is the fourth generation of advanced nuclear power system (such as liquid metal cooled fast reactor, accelerator driven subcritical system) in the current research, which generates a traveling wave magnetic field through the three-phase alternating current outside the coil winding, and the induced current in the liquid metal flow interacts with the traveling wave magnetic field to generate a Lorentz force along the axis of the liquid metal flow channel, thereby driving the liquid metal fluid to flow along the axis of the flow channel. The cylindrical linear induction electromagnetic pump has simple structure, no mechanical moving parts, and builds a completely sealed liquid metal flow channel, realizing stable operation without leakage. With the development of science and technology, deep sea exploration, remote deep space exploration and space nuclear power station projects have put forward higher requirements for the miniaturization and high efficiency of nuclear power reactor technology, and the electromagnetic pump for transporting liquid metal coolant also needs to be improved in miniaturization, light weight and high efficiency.

[0003] The domestic invention patent CN201911262539.3 "A self-stable flow cylindrical linear induction electromagnetic pump" adopts a plurality of external stators distributed in a circumferential staggered manner, significantly reducing the circumferential unevenness of the magnetic field and reducing the disturbance of the non-axial Lorentz force on the fluid. The invention patent CN201710167971.9 "A cylindrical linear induction electromagnetic pump with an added flow stabilizing guide plate" effectively hinders and destroys the formation and development of eddy currents in the flow channel by adding a flow stabilizing guide plate circumferentially in the liquid metal flow channel, greatly improving the flow stability of the liquid metal in the pump. The invention patent CN201710371575 "A multi-stage ALIP electromagnetic pump with a flow stabilizing section" divides the entire pump body into multiple pump sections, each pump section consisting of an electromagnetic section and a flow stabilizing section. The electromagnetic section is responsible for doing work to increase the pressure of the metal liquid, while the flow stabilizing section is responsible for stabilizing the unstable flow of the metal liquid. Two winding coil wiring methods, single-sided wiring and double-sided wiring, are proposed to improve the uniformity of the Lorentz force in the radial direction of the flow channel. The invention patent CN202010993274.0 "A cylindrical linear induction electromagnetic pump with axial guide vanes" significantly reduces the influence of the circumferential uneven disturbance of the magnetic field and flow field on the stability of the flow field by arranging axial guide vanes circumferentially in the electromagnetic pump flow channel, thereby playing a flow stabilizing role. The above patents all propose some improvements and innovations for electromagnetic pumps, but existing electromagnetic pumps are usually externally connected to the liquid metal storage container through pipes, etc. Therefore, for some special working environments with limited space and weight, how to reduce the floor area and weight of the pump is a technical problem that needs to be solved. SUMMARY

[0004] To solve the problems of large floor area and weight of the existing cylindrical linear induction electromagnetic pump circulating system, the present application discloses a circulating system equipped with a submersible cylindrical linear induction electromagnetic pump, which directly arranges the cylindrical linear induction electromagnetic pump in the container filled with liquid metal along the longitudinal direction, thereby reducing the floor area and weight of the electromagnetic pump.

[0005] The technical solution adopted by the present application is as follows:

[0006] A circulating system equipped with a submersible cylindrical linear induction electromagnetic pump, comprising:

[0007] A liquid metal container filled with liquid metal and inert gas;

[0008] The cylindrical linear induction electromagnetic pump is arranged longitudinally in the liquid metal container and is immersed in the liquid metal; the cylindrical linear induction electromagnetic pump comprises an inner stator, an outer stator, a driving coil winding and a heat dissipation fin structure; the inner stator is externally sleeved with the outer stator, and the two are coaxially arranged with a gap; the inner wall of the outer stator is embedded with the driving coil winding, and the heat dissipation fin structure is arranged on the outer wall of the outer stator; there is also a gap between the outer stator and the heat dissipation fin structure and the wall of the liquid metal container.

[0009] The annular flow channel of the liquid metal is formed by the inner and outer gaps of the cylindrical linear induction electromagnetic pump.

[0010] Further, an annular vertical tube plate is arranged on the upper portion of the cylindrical linear induction electromagnetic pump, the vertical tube plate is coaxially arranged with the cylindrical linear induction electromagnetic pump, and a gap is formed between the outer wall of the vertical tube plate and the wall of the liquid metal container, which is opposite to the gap between the cylindrical linear induction electromagnetic pump and the wall of the liquid metal container.

[0011] Further, the vertical tube plate adopts a self-top-to-bottom gradually expanding type, and a gradually tapered gap is formed between the vertical tube plate and the wall of the liquid metal container.

[0012] Further, chamfer structures are arranged at the upper and lower ends of the outer gap of the cylindrical linear induction electromagnetic pump, which play a flow guiding role on the liquid metal at the intersection of the inner and outer gaps.

[0013] Further, a heat-conducting material is laid between the heat dissipation fin structure and the outer stator.

[0014] Further, the surface of the heat dissipation fin structure is coated with a high-radiation material.

[0015] Further, a guide plate is arranged in the gap between the inner stator and the outer stator, and the guide plate is uniformly arranged.

[0016] Further, heat insulation materials are laid on the inner wall of the outer stator and the outer wall of the inner stator.

[0017] Further, the driving coil winding adopts a Y-shaped wiring form.

[0018] Further, the outer stator and the inner stator are both composed of a plurality of silicon steel sheets or other soft magnetic material sheets.

[0019] Beneficial effects:

[0020] 1. By longitudinally arranging the electromagnetic pump in the container filled with liquid metal, the driving magnetic field generated by the driving coil winding is used to drive the circulation flow of the liquid metal, which can significantly reduce the floor area and weight of the liquid metal circulation loop compared with the design of the electromagnetic pump outside, and can effectively solve the requirements of robustness and lightweight of the equipment in extreme environments such as deep sea and deep space.

[0021] 2. A heat dissipation fin structure is arranged on the outside of the stator of the electromagnetic pump, which improves the heat dissipation efficiency of the pump under different operating conditions and greatly extends the service life of the liquid metal circulation loop. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a quarter-section view of a circulation system equipped with a submersible cylindrical linear induction electromagnetic pump.

[0024] Figure 2 This is an axial sectional view of a circulation system equipped with a submersible cylindrical linear induction electromagnetic pump.

[0025] Figure 3 This is a quarter-section view of a submersible cylindrical linear induction electromagnetic pump.

[0026] Figure 4 This is a cross-sectional view of a submersible cylindrical linear induction electromagnetic pump.

[0027] Figure 5 This is an isometric drawing of the heat dissipation fin structure.

[0028] The following is a supplementary explanation of the attached drawings: 1. Inert gas chamber, 2. Liquid metal container, 3. Vertical tube sheet, 4. Liquid metal, 5. Heat dissipation fin structure, 6. External stator, 7. Drive coil winding, 8. Inner wall of external stator, 9. Outer wall of internal stator, 10. Internal stator. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] To address the problems of large footprint and excessive weight associated with existing cylindrical linear induction electromagnetic pump circulation systems, this embodiment provides a circulation system equipped with a submersible cylindrical linear induction electromagnetic pump, combined with... Figures 1-2 To elaborate.

[0031] The application discloses a circulating system equipped with a diving type cylindrical linear induction electromagnetic pump Figure 1 、 2 . The circulating system comprises a liquid metal container 2, a cylindrical linear induction electromagnetic pump and an annular flow channel. The liquid metal container 2 is a closed cavity structure, and is internally provided with liquid metal 4 and inert gas. Because the densities of the liquid metal 4 and the inert gas are different, the liquid metal 4 forms a liquid metal cavity in the lower part of the liquid metal container 2, and the inert gas forms an inert gas cavity 1 in the upper part of the liquid metal container 2.

[0032] The cylindrical linear induction electromagnetic pump is longitudinally arranged in the liquid metal container 2 and is immersed in the liquid metal cavity, and the structure is shown in Figure 3 、 4 5. The cylindrical linear induction electromagnetic pump comprises an inner stator 10, an outer stator 6, a driving coil winding 7 and a heat dissipation fin structure 5. The inner stator 10 is externally sleeved with the outer stator 6, and the two are coaxially arranged and have a gap; a wire slot is formed in the inner wall surface of the outer stator 6 and is used for embedding the driving coil winding 7. The heat dissipation fin structure 5 is arranged on the outer wall surface of the outer stator 6. There is also a gap between the outer stator 6, the heat dissipation fin structure 5 and the wall surface of the liquid metal container 2.

[0033] In the liquid metal cavity, the annular flow channel is formed by the gap between the inner stator 10 and the outer stator 6, and the gap between the outer stator 6, the heat dissipation fin structure 5 and the wall surface of the liquid metal container 2. The liquid metal 4 flowing through the gap in the cylindrical linear induction electromagnetic pump flows upward along the axial direction under the interaction of the magnetic field and the induced current, and the liquid metal 4 flowing out from the top of the electromagnetic pump flows downward along the axial direction in the outer gap of the cylindrical linear induction electromagnetic pump. In this way, the circulation is formed repeatedly, and the circulation flow of the liquid metal 4 in the liquid metal container 2 is realized.

[0034] In some embodiments, if the length of the liquid metal container 2 is much longer than the length of the cylindrical linear induction electromagnetic pump, in order to ensure that the liquid metal 4 flowing out from the upper part of the cylindrical linear induction electromagnetic pump can flow into the side gap better, a vertical pipe plate 3 in the form of an annulus is arranged at the outlet of the upper part of the cylindrical linear induction electromagnetic pump. The vertical pipe plate 3 is coaxially arranged with the cylindrical linear induction electromagnetic pump, and a gap is formed between the outer wall of the vertical pipe plate 3 and the wall surface of the liquid metal container 2. The gap is opposite to the gap between the cylindrical linear induction electromagnetic pump and the wall surface of the liquid metal container 2.

[0035] In some embodiments, in order to improve the backflow effect of the liquid metal 4, the vertical pipe plate 3 can be designed in a non-straight pipe form, for example, the vertical pipe plate 3 is designed in a self-top-to-bottom gradually expanding form, so that a gradually tapered gap is formed between the vertical pipe plate 3 and the wall surface of the liquid metal container 2, and the backflow speed of the liquid metal 4 can be improved.

[0036] In some embodiments, in order to improve the effect of the liquid metal 4 backflow, a chamfer structure can also be arranged at the upper and lower ends of the outer gap of the cylindrical linear induction electromagnetic pump, so that the liquid metal 4 at the intersection of the inner and outer gaps flows more smoothly.

[0037] In some embodiments, the liquid metal container 2 is not completely filled with liquid metal 4, and the remaining space is filled with inert gas, which is used to seal the liquid metal container 2, while reducing the corrosion of the liquid metal on the top sealing part of the liquid metal container 2.

[0038] In some embodiments, a heat-conducting material such as graphene, silicon carbide (SiC), etc. is laid between the heat dissipation fin structure 5 and the external stator 6; and a high-radiation material such as boride material, ceramic fiber composite material, etc. is coated on the surface of the heat dissipation fin structure 5.

[0039] In some embodiments, a guide plate is arranged in the flow channel between the inner wall 8 of the external stator and the outer wall 9 of the internal stator, and the guide plates are uniformly arranged and the number is designed according to the specific application conditions.

[0040] In some embodiments, a layer of heat insulation material is laid on the inner wall 8 of the external stator and the outer wall 9 of the internal stator.

[0041] In some embodiments, the driving coil winding 7 adopts a Y-type connection form.

[0042] In some embodiments, the external stator 6 and the internal stator 10 are both composed of multiple silicon steel sheets or other soft magnetic material sheets.

[0043] In some embodiments, the materials of the heat dissipation fin structure 5, the inner wall 8 of the external stator and the outer wall 9 of the internal stator are all high-temperature-resistant and liquid metal corrosion-resistant materials, so that the cylindrical linear induction electromagnetic pump can be directly installed in the liquid metal.

[0044] In some embodiments, the liquid metal container 2 is made of corrosion-resistant and high-temperature-resistant materials such as austenitic non-magnetic stainless steel and molybdenum rhenium alloy; and the liquid metal 4 is made of materials with high electrical conductivity such as liquid sodium and lead bismuth alloy.

[0045] In summary, the present application adds a heat dissipation fin structure outside the external stator without affecting the structure of the external stator and the flow channel of the cylindrical linear induction electromagnetic pump, fixes the pump vertically in a container filled with liquid metal, and seals it with an inert gas tank. The driving coil winding provides a driving magnetic field to drive the liquid metal in the container to circulate, and the heat dissipation fin structure increases the heat dissipation efficiency of the pump, thereby significantly reducing the influence of magnetic field distortion caused by excessive temperature, greatly improving the service life of the liquid metal circulating loop under different working conditions, and effectively solving the requirements of robustness and light weight of equipment in extreme environments such as deep sea and deep space.

[0046] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The above description is merely preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump, characterized in that, include: A liquid metal container (2) is filled with liquid metal (4) and inert gas; A cylindrical linear induction electromagnetic pump is arranged longitudinally and completely submerged in the liquid metal container (2). The cylindrical linear induction electromagnetic pump is completely submerged in the liquid metal (4). The cylindrical linear induction electromagnetic pump includes an inner stator (10), an outer stator (6), a drive coil winding (7), and a heat dissipation fin structure (5). The inner stator (10) is fitted with an outer stator (6), and the two are arranged coaxially with a gap to form an internal flow channel; The inner wall of the outer stator (6) is fitted with a drive coil winding (7), and the heat dissipation fin structure (5) is disposed on the outer wall surface of the outer stator (6) and directly contacts the liquid metal (4); There is also a gap between the external stator (6) and the heat dissipation fin structure (5) and the wall of the liquid metal container (2) to form an external flow channel; The internal and external flow channels are connected at the top and bottom of the electromagnetic pump, forming a closed liquid metal circulation loop. A ring-shaped vertical tube plate (3) is provided on the upper part of the cylindrical linear induction electromagnetic pump. The vertical tube plate (3) is arranged coaxially with the cylindrical linear induction electromagnetic pump, and a gap is formed between the outer wall of the vertical tube plate (3) and the wall of the liquid metal container (2). This gap is opposite to the gap between the cylindrical linear induction electromagnetic pump and the wall of the liquid metal container (2).

2. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that, The vertical tube sheet (3) is gradually expanding from top to bottom, and a gradually narrowing gap is formed between it and the wall of the liquid metal container (2).

3. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that, Chamfered structures are set at the upper and lower ends of the external gap of the cylindrical linear induction electromagnetic pump to guide the liquid metal (4) at the junction of the inner and outer gaps.

4. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that, A thermally conductive material is laid between the heat dissipation fin structure (5) and the external stator (6).

5. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that, The surface of the heat dissipation fin structure (5) is coated with a high-emissivity material.

6. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that, Guide plates are arranged in the gap between the inner stator (10) and the outer stator (6), and the guide plates are evenly distributed.

7. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that, Insulating material is laid on both the inner wall (8) of the outer stator and the outer wall (9) of the inner stator.

8. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that, The drive coil winding (7) adopts a Y-type connection.

9. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that, Both the outer stator (6) and the inner stator (10) are made of multiple silicon steel sheets or other soft magnetic material sheets stacked together.

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