Circulating system equipped with submersible type cylindrical linear induction electromagnetic pump

Abstract

The invention provides a circulating system equipped with a submersible type cylindrical linear induction electromagnetic pump, which is characterized in that the electromagnetic pump is arranged in a container filled with liquid metal along the longitudinal direction, an inert gas tank is arranged for sealing, and a radiating fin structure is arranged on the outer side of an external stator of the electromagnetic pump. According to the submersible electromagnetic pump circulation system, the occupied area and weight of the liquid metal circulation loop are remarkably reduced, the service life of the liquid metal circulation loop under different working condition requirements is greatly prolonged, and the requirements of deep sea, deep space and other extreme environments for robustness and light weight of equipment can be effectively met.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic pumps, and in particular to a circulation system equipped with a submersible cylindrical linear induction electromagnetic pump. Background Art

[0002] An electromagnetic pump is a device for conveying conductive fluids. It can use the effects of current and magnetic field in liquid metal to directly apply the generated Lorentz force to liquid metal to make it flow. Electromagnetic pumps are widely used in aerospace industry, nuclear industry, metal production, and chip cooling. Electromagnetic pumps can be divided into conduction pumps and induction pumps according to the type of current supply. The source of current in the conduction pump is the conduction of the liquid, while the source of current in the induction pump is the induction of the relative movement of the magnetic flux and the liquid; according to the power supply type, it can be divided into DC pumps and AC pumps (including single-phase and three-phase); according to the flow channel structure, it can be divided into cylindrical pumps, spiral pumps, and plane pumps (including single-sided and double-sided). The cylindrical linear induction electromagnetic pump (ALIP) is a liquid metal main circulation pump in the fourth-generation advanced nuclear power system (such as liquid metal cooled fast neutron reactors and accelerator driven subcritical systems) currently under research. The traveling wave magnetic field generated by the external three-phase alternating current induction on the coil winding interacts with the induced current in the liquid metal fluid, generating a Lorentz force along the axial direction of the liquid metal flow channel, thereby driving the liquid metal fluid to flow along the axial direction of the flow channel. The cylindrical linear induction electromagnetic pump has a simple structure and no mechanical moving parts. It constructs a completely closed liquid metal flow channel and realizes stable and leak-free operation. With the development of science and technology, projects such as deep-sea exploration, deep space exploration, and space nuclear power plants have put forward higher requirements for the miniaturization and efficiency of nuclear power reactor technology. Among them, the electromagnetic pump used to transport liquid metal coolant must also be improved and studied towards miniaturization, lightness, and efficiency.

[0003] Domestic invention patent CN201911262539.3 "A self-stabilizing cylindrical linear induction electromagnetic pump" adopts a multi-section circumferentially staggered external stator, which significantly reduces the unevenness of the circumferential distribution of the magnetic field and reduces the disturbance of the non-axial Lorentz force on the fluid. Invention patent CN201710167971.9 "A cylindrical linear induction electromagnetic pump with an additional flow-stabilizing guide plate" effectively hinders and destroys the formation and development of vortices in the flow channel by adding a flow-stabilizing guide plate circumferentially to the liquid metal flow channel, greatly improving the flow stability of the liquid metal in the pump. Invention patent CN201710371575 "A multi-stage ALIP electromagnetic pump with a stabilizing flow section" divides the entire pump body into multiple pump sections. Each pump section consists of a first electromagnetic section and a first stabilizing flow section. The electromagnetic section is responsible for pressurizing the molten metal, while the stabilizing flow section is responsible for stabilizing the unstable flow of the molten metal. 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. Invention patent CN202010993274.0 "A cylindrical linear induction electromagnetic pump with axial guide vanes" significantly reduces the influence of circumferential uneven disturbances of the magnetic field and flow field on the stability of the flow field by arranging axial guide vanes circumferentially in the flow channel of the electromagnetic pump, thereby playing a role in stabilizing the flow. The above patents all propose some improvement and innovative measures for electromagnetic pumps, but the existing electromagnetic pumps are usually externally mounted on the outside of the liquid metal storage container, so pipelines are required to connect the electromagnetic pump and the liquid metal storage container; and for some special working environments with limited space and weight, how to reduce the footprint and weight of the pump is a technical problem that urgently needs to be solved. Summary of the invention

[0004] In order to solve the problems of existing cylindrical linear induction electromagnetic pump circulation systems such as large footprint and heavy weight, the present invention discloses a circulation system equipped with a submersible cylindrical linear induction electromagnetic pump. The cylindrical linear induction electromagnetic pump is directly arranged longitudinally in a container filled with liquid metal to reduce the footprint and weight of the electromagnetic pump.

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

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

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

[0008] A cylindrical linear induction electromagnetic pump is arranged longitudinally in the liquid metal container, and the cylindrical linear induction electromagnetic pump is immersed in the liquid metal; the cylindrical linear induction electromagnetic pump comprises an internal stator, an external stator, a drive coil winding and a heat dissipation fin structure; the external stator is mounted on the outside of the internal stator, and the two are coaxially arranged with a gap; the inner wall of the external stator is embedded with the drive coil winding, and the heat dissipation fin structure is arranged on the outer wall surface of the external stator; there is also a gap between the external stator and the heat dissipation fin structure and the wall surface of the liquid metal container;

[0009] The inner and outer gaps of the cylindrical linear induction electromagnetic pump form an annular flow channel for liquid metal.

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

[0011] Furthermore, the vertical tube sheet is of a type that expands gradually from top to bottom, and a gradually shrinking gap is formed between the vertical tube sheet and the wall of the liquid metal container.

[0012] Furthermore, chamfered structures are provided at the upper and lower ends of the external gap of the cylindrical linear induction electromagnetic pump to guide the liquid metal at the intersection of the internal and external gaps.

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

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

[0015] Further, guide plates are arranged in the gap between the inner stator and the outer stator, and the guide plates are evenly arranged.

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

[0017] Furthermore, the drive coil winding adopts a Y-type connection form.

[0018] Furthermore, the outer stator and the inner stator are both formed by stacking a plurality of silicon steel sheets or other thin sheets of soft magnetic materials.

[0019] Beneficial effects:

[0020] 1. The present invention arranges the electromagnetic pump longitudinally in a container filled with liquid metal and utilizes the driving magnetic field generated by the driving coil winding to drive the liquid metal to circulate. Compared with the design of external electromagnetic pump, the footprint and weight of the liquid metal circulation loop can be significantly reduced, and the requirements for robustness and lightweight of equipment in extreme environments such as deep sea and deep space can be effectively met.

[0021] 2. The 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 working conditions and greatly improves the service life of the liquid metal circulation loop. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A quarter cross-sectional view of a circulation system equipped with a submersible cylindrical linear induction electromagnetic pump.

[0024] Figure 2 An axial cross-sectional view of a circulation system equipped with a submersible cylindrical linear induction electromagnetic pump.

[0025] Figure 3 A quarter cross-sectional view of a submersible cylindrical linear induction electromagnetic pump.

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

[0027] Figure 5 Isometric view of the heat dissipation fin structure.

[0028] The following is a supplementary explanation of the accompanying 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. External stator inner wall, 9. Internal stator outer wall, 10. Internal stator. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to solve the problems of large floor space and excessive weight in the existing cylindrical linear induction electromagnetic pump circulation system, this embodiment provides a circulation system equipped with a submersible cylindrical linear induction electromagnetic pump, combined with the attached Figure 1-2 To elaborate.

[0031] The present invention is designed to be equipped with a submersible cylindrical linear induction electromagnetic pump. The structure of the circulation system can be referred to Figure 1 , 2 The invention 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 liquid metal 4 and inert gas are contained therein. Due to the different densities of the two, the liquid metal 4 forms a liquid metal cavity at the bottom of the liquid metal container 2; and the inert gas forms an inert gas cavity 1 at the top of the liquid metal container 2.

[0032] The cylindrical linear induction electromagnetic pump is arranged longitudinally in the liquid metal container 2 and immersed in the liquid metal cavity. Its structure is as follows: Figure 3 , 4 , 5. The cylindrical linear induction electromagnetic pump comprises an internal stator 10, an external stator 6, a drive coil winding 7 and a heat dissipation fin structure 5. The external stator 6 is mounted on the external part of the internal stator 10, and the two are coaxially arranged with a gap; a wire groove is provided on the inner wall surface of the external stator 6 for embedding the drive coil winding 7. The heat dissipation fin structure 5 is arranged on the outer wall surface of the external stator 6. There is also a gap between the external stator 6 and the heat dissipation fin structure 5 and the wall surface of the liquid metal container 2.

[0033] In the liquid metal cavity, an annular flow channel is formed by the gap between the internal stator 10 and the external stator 6, and the gap between the external stator 6 and the heat dissipation fin structure 5 and the wall of the liquid metal container 2. The liquid metal 4 flowing through the inner gap of the cylindrical linear induction electromagnetic pump flows axially upward 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 axially downward along the outer gap of the cylindrical linear induction electromagnetic pump, thereby forming a reciprocating cycle to realize the circulating flow of the liquid metal 4 in the liquid metal container 2.

[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, the present invention arranges an annular vertical tube sheet 3 at the upper outlet of the cylindrical linear induction electromagnetic pump, and the vertical tube sheet 3 is coaxially arranged with the cylindrical linear induction electromagnetic pump, and a gap is formed between the outer wall of the vertical tube sheet 3 and the wall of the liquid metal container 2, and the gap is opposite to the gap between the cylindrical linear induction electromagnetic pump and the wall of the liquid metal container 2.

[0035] In some embodiments, in order to improve the reflux effect of the liquid metal 4, the vertical tube sheet 3 can adopt a non-straight tube design. For example, the vertical tube sheet 3 adopts a gradually expanding type from top to bottom, so that a gradually shrinking gap is formed between it and the wall of the liquid metal container 2, which can increase the reflux speed of the liquid metal 4.

[0036] In some embodiments, in order to improve the reflux effect of the liquid metal 4, chamfered structures may be provided at the upper and lower ends of the external 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 to seal the liquid metal container 2 and reduce the corrosion of the liquid metal on the top seal of the liquid metal container 2.

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

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

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

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

[0042] In some embodiments, the outer stator 6 and the inner stator 10 are both formed by stacking a plurality of silicon steel sheets or other soft magnetic material sheets.

[0043] In some embodiments, the heat dissipation fin structure 5, the outer stator inner wall 8 and the inner stator outer wall 9 are all made of materials resistant to high temperature and liquid metal corrosion, 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, molybdenum-rhenium alloy, etc.; the liquid metal 4 is made of highly conductive materials, such as liquid metal sodium, lead-bismuth alloy, etc.

[0045] In summary, the present invention adds a heat dissipation fin structure on the outside of the external stator without affecting the external stator and flow channel structure of the cylindrical linear induction electromagnetic pump, and vertically fixes the pump in a container filled with liquid metal, which is sealed by 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 distortion of the electromagnetic pump magnetic field due to excessive temperature, greatly improving the service life of the liquid metal circulation loop under different working conditions, and can effectively solve the requirements for robustness and lightweight of equipment in extreme environments such as deep sea and deep space.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump, characterized in that: include: A liquid metal container (2), wherein the liquid metal container (2) is filled with liquid metal (4) and an inert gas; A cylindrical linear induction electromagnetic pump is arranged longitudinally in the liquid metal container (2), and the cylindrical linear induction electromagnetic pump is immersed in the liquid metal (4); the cylindrical linear induction electromagnetic pump comprises an internal stator (10), an external stator (6), a drive coil winding (7) and a heat dissipation fin structure (5); the external stator (6) is mounted on the external part of the internal stator (10), and the two are arranged coaxially with a gap; the drive coil winding (7) is embedded in the inner wall of the external stator (6), and the heat dissipation fin structure (5) is arranged on the outer wall of the external stator (6); and 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); An annular flow channel for liquid metal (4) is formed by inner and outer gaps of a cylindrical linear induction electromagnetic pump.

2. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that: An annular vertical tube sheet (3) is arranged on the upper part of the cylindrical linear induction electromagnetic pump. The vertical tube sheet (3) is coaxially arranged with the cylindrical linear induction electromagnetic pump, and a gap is formed between the outer wall of the vertical tube sheet (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).

3. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 2, characterized in that: The vertical tube plate (3) is of a type that expands gradually from top to bottom, and forms a gradually shrinking gap between the vertical tube plate (3) and the wall surface of the liquid metal container (2).

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

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

6. 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-radiation material.

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

8. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that: The outer stator inner wall (8) and the inner stator outer wall (9) are both paved with heat insulation materials.

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

10. A circulation system equipped with a submersible cylindrical linear induction electromagnetic pump according to claim 1, characterized in that: The external stator (6) and the internal stator (10) are both formed by stacking a plurality of silicon steel sheets or other thin sheets of soft magnetic material.

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