High-efficiency liquid metal electromagnetic pump

Abstract

A high-efficiency liquid metal electromagnetic pump includes a pump core, a first sleeve, and a second sleeve. The first and second sleeves are coaxially nested, with the pump core located within the second sleeve. A heat insulation layer, made of inorganic material, is also provided between the pump core and the second sleeve. The sleeve bodies of both the first and second sleeves are cast from refractory castable, and the sleeve bodies also contain a mesh. This invention, by adding a heat insulation layer between the pump core and the second sleeve, shares the heat insulation function of the second sleeve, reducing the thickness of the existing second sleeve by half, significantly lowering the manufacturing difficulty and cost. Simultaneously, the reduced thickness of the second sleeve brings the pump core closer to the liquid metal in the pumping channel, improving the pumping efficiency of the pump core. Using refractory castable for the sleeve significantly saves costs compared to silicon nitride ceramic sleeves. The mesh within the castable increases the structural strength of the sleeve.

Description

Technical Field

[0001] This invention relates to the field of liquid metal electromagnetic pump technology, and specifically to a high-efficiency liquid metal electromagnetic pump. Background Technology

[0002] Patent CN2023115882691 discloses a liquid metal electromagnetic pump, including a pump core, a first sleeve, and a second sleeve. The first and second sleeves are coaxially nested, and the gap between them forms a pumping channel. The pump core is located in the second sleeve. In this configuration, the coil and magnet in the pump core are separated from the external high-temperature liquid metal only by the inner wall of the second sleeve. This places extremely high demands on the material, thickness, and thermal insulation performance of the second sleeve, resulting in high manufacturing difficulty and processing costs. Excessive thickness of the second sleeve can also lead to a greater distance between the pump core and the liquid metal in the pumping channel, affecting the pumping efficiency of the traveling wave magnetic field. Furthermore, the sleeve is immersed in the high-temperature molten liquid metal and must withstand high temperatures, the scouring of the liquid metal, and repeated thermal shocks, placing very high demands on the material properties. Sleeves made of ordinary high-temperature resistant materials are prone to cracking under such repeated thermal shocks. Currently, silicon nitride is commonly used in the industry to make sleeves, but silicon nitride sleeves are difficult to process and expensive. Summary of the Invention

[0003] The purpose of this invention is to provide a low-cost, easy-to-manufacture, and high-efficiency liquid metal electromagnetic pump to solve the problems of existing electromagnetic pumps being difficult to manufacture and costly.

[0004] To achieve the above-mentioned objectives, the technical solution of the present invention is as follows:

[0005] A high-efficiency liquid metal electromagnetic pump includes a pump core, a first sleeve, and a second sleeve. The first and second sleeves are coaxially nested, and the gap between them forms a pumping channel. The pump core is located in the second sleeve, and a heat insulation layer is provided between the pump core and the second sleeve. The heat insulation layer is made of inorganic material, and its thickness is no more than 10 mm. Preferably, the thickness of the heat insulation layer is 2 mm.

[0006] Furthermore, the insulation layer is a composite insulation layer, comprising a main insulation layer and an insulating layer, with the insulating layer located between the pump core and the main insulation layer. The main insulation layer is an aerogel film, and the insulating layer is an inorganic woven fabric. The aerogel film has a thickness of 1 mm, and the inorganic woven fabric has a thickness of 1 mm.

[0007] Furthermore, the sleeve body of the first sleeve and / or the second sleeve is cast from refractory castable, and the sleeve body also has a mesh inside. The mesh is an inorganic woven material or a metal mesh. The metal mesh is iron wire mesh or stainless steel wire mesh.

[0008] Furthermore, the metal mesh is a cylindrical shape coaxial with the sleeve body. The metal mesh includes warp and weft threads, and the intersection of the warp and weft threads has an insulating sleeve for separating the warp and weft threads. The weft thread is made of single metal wires connected end to end, and the intersection of the metal wires has an insulating sleeve for separating the two ends of the single metal wires. The insulating sleeve is an inorganic woven material.

[0009] Inorganic woven fabrics are made of at least one of glass fiber, basalt fiber and alumina fiber.

[0010] The beneficial technical effects of the present invention compared with the prior art are as follows:

[0011] The present invention provides a high-efficiency liquid metal electromagnetic pump. By adding a heat insulation layer between the pump core and the second sleeve, the heat insulation layer shares the heat insulation function of the second sleeve, which can reduce the thickness of the existing second sleeve by half, greatly reducing the manufacturing difficulty and cost of the second sleeve.

[0012] Meanwhile, the reduction in the thickness of the second sleeve also brings the pump core closer to the liquid metal in the pumping channel, improving the pumping efficiency of the pump core.

[0013] By using a composite insulation layer, the thickness of the insulation layer is compressed to a few millimeters, further reducing the distance between the pump core and the liquid metal in the pumping channel.

[0014] Using refractory castable to make the sleeve can greatly save costs compared to silicon nitride ceramic sleeves; the mesh inside the castable is used to increase the structural strength of the sleeve;

[0015] Using a wire mesh can further increase the structural strength of the sleeve, and the warp and weft threads of the metal mesh are isolated from each other by insulating sleeves, so as not to form annular eddy current channels that would generate additional losses and not to affect the normal operation of the electromagnetic field of the traveling wave of the electromagnetic pump. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the liquid metal electromagnetic pump in Embodiment 1 of the present invention;

[0017] Figure 2 This is a schematic diagram (front view) of the metal mesh structure in Embodiment 1 of the present invention;

[0018] Figure 3 This is a schematic diagram (top view) of the metal mesh structure in Embodiment 1 of the present invention. Detailed implementation method:

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Any omissions can be addressed by referring to the solution disclosed in patent CN2024228633574.

[0020] Example 1

[0021] like Figure 1 As shown, a high-efficiency liquid metal electromagnetic pump includes a pump core 1, a first sleeve 2, and a second sleeve 3. The first sleeve 2 and the second sleeve 3 are coaxially nested, and the gap between the first sleeve 2 and the second sleeve 3 forms a pumping channel. The pump core 1 is located in the second sleeve 3. A heat insulation layer 4, made of inorganic material and 2mm thick, is also provided between the pump core 1 and the second sleeve 3. By adding the heat insulation layer 4 between the pump core 1 and the second sleeve 3, the heat insulation function of the second sleeve 3 is shared by the heat insulation layer 4, thus reducing the thickness of the second sleeve 3.

[0022] In a preferred embodiment, the insulation layer 4 is a composite insulation layer, comprising a main insulation layer and an insulating layer, with the insulating layer located between the pump core 1 and the main insulation layer. The main insulation layer is an aerogel film 401, and the insulating layer is an inorganic woven fabric 402. The inorganic woven fabric is woven from at least one of glass fiber, basalt fiber, and alumina fiber. The aerogel film 401 has a thickness of 1 mm, and the inorganic woven fabric 402 has a thickness of 1 mm. The aerogel film 401 primarily serves as insulation, while the inorganic woven fabric 402 serves to separate the pump core 1 from the aerogel film 401 and also helps maintain the position and shape of the aerogel film 401.

[0023] The sleeve bodies of the first sleeve 2 and the second sleeve 3 are cast from refractory castable, and the inside of the sleeve body also has a mesh to increase the structural strength of the sleeve body.

[0024] In one implementation, the mesh is a cylindrical stainless steel wire mesh coaxial with the sleeve body. For example... Figure 2 and Figure 3 As shown, the metal mesh includes warp and weft threads. The intersections of the warp and weft threads have insulating sleeves to separate them. The weft threads are formed by connecting single metal wires end-to-end, and the points where the wires meet also have insulating sleeves to separate the ends of the individual wires. These insulating sleeves are made of an inorganic woven material. The insulating sleeves isolate the warp and weft threads, preventing them from forming annular eddy current channels and thus affecting the normal operation of the electromagnetic pump's traveling wave electromagnetic field.

[0025] As another implementation method, the mesh is an inorganic woven material, which is directly woven from glass fiber, basalt fiber, alumina fiber, etc., or glass fiber, basalt fiber or alumina fiber is first woven into rope and then further woven into a mesh.

Claims

1. A high-efficiency liquid metal electromagnetic pump, comprising a pump core, a first sleeve, and a second sleeve, wherein the first sleeve and the second sleeve are coaxially nested, the gap between the first sleeve and the second sleeve forms a pumping channel, and the pump core is located in the second sleeve, characterized in that, There is also a heat insulation layer between the pump core and the second sleeve. The heat insulation layer is made of inorganic material and its thickness is no more than 10mm.

2. The high-efficiency liquid metal electromagnetic pump according to claim 1, characterized in that, The thickness of the insulation layer is 2mm.

3. A high-efficiency liquid metal electromagnetic pump according to claim 1 or 2, characterized in that, The insulation layer is a composite insulation layer, which includes a main insulation layer and an insulating layer, with the insulating layer located between the pump core and the main insulation layer.

4. A high-efficiency liquid metal electromagnetic pump according to claim 3, characterized in that, The main insulation layer is an aerogel film, and the insulating layer is an inorganic woven fabric.

5. A high-efficiency liquid metal electromagnetic pump according to claim 4, characterized in that, The aerogel film has a thickness of 1 mm, and the inorganic woven fabric has a thickness of 1 mm.

6. A high-efficiency liquid metal electromagnetic pump according to claim 1, characterized in that, The sleeve body of the first sleeve and / or the second sleeve is cast from refractory castable, and the sleeve body also has a mesh inside.

7. The high-efficiency liquid metal electromagnetic pump according to claim 6, wherein the mesh is an inorganic woven fabric or a metal mesh.

8. A high-efficiency liquid metal electromagnetic pump according to claim 6, wherein the metal mesh is a cylindrical shape coaxial with the sleeve body, the metal mesh includes warp and weft threads, and the intersection of the weft and warp threads is further provided with an insulating sleeve for separating the warp and weft threads; the weft thread is formed by connecting single metal wires end to end, and the intersection of the metal wires end to end is provided with an insulating sleeve for separating the two ends of the single metal wire, the insulating sleeve being an inorganic woven material.

9. A high-efficiency liquid metal electromagnetic pump according to claim 7 or 8, characterized in that, The metal mesh is either iron wire mesh or stainless steel mesh.

10. A high-efficiency liquid metal electromagnetic pump according to claim 4, 5, 7 or 8, characterized in that, The inorganic woven fabric is woven from at least one of glass fiber, basalt fiber and alumina fiber.

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