A sleeve for a liquid metal electromagnetic pump

Abstract

A sleeve for a liquid metal electromagnetic pump includes a sleeve body cast from refractory castable. The sleeve body also contains a cylindrical metal mesh coaxial with the sleeve body. The cylindrical metal mesh includes warp and weft threads, with insulating layers separating the warp and weft threads at their intersections. Each weft thread is formed by connecting single metal wires end-to-end, with insulating layers separating the ends of the connecting wires. This invention, using refractory castable for the sleeve of a liquid metal electromagnetic pump, significantly reduces costs compared to silicon nitride ceramic sleeves. The internal metal mesh increases the structural strength of the sleeve, and the insulating sleeves between the warp and weft threads prevent the formation of annular eddy current channels that would generate additional losses, thus not affecting the normal operation of the traveling wave electromagnetic field of the electromagnetic pump.

Description

Technical Field

[0001] This invention relates to the field of liquid metal electromagnetic pump technology, and more specifically to a sleeve for a liquid metal electromagnetic pump. Background Technology

[0002] The sleeve is a crucial component of a liquid metal electromagnetic pump. Immersed in molten liquid metal at high temperatures, it must withstand extreme temperatures, the scouring effect of the liquid metal, and repeated thermal shocks, placing extremely high demands on the material's performance. 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 for sleeve manufacturing, 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 and easy-to-manufacture liquid metal electromagnetic pump sleeve to replace the expensive and difficult-to-process silicon nitride sleeve.

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

[0005] A sleeve for a liquid metal electromagnetic pump includes a sleeve body made of refractory castable. The sleeve body also has a cylindrical metal mesh inside, which is coaxial with the sleeve body. The cylindrical metal mesh includes warp and weft threads, and the intersection of the warp and weft threads has an insulating layer to separate 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 has an insulating layer to separate the two ends of the single metal wire.

[0006] Furthermore, the cylindrical metal mesh is made of iron wire mesh or stainless steel wire mesh.

[0007] Furthermore, the insulating layer is an insulating sleeve.

[0008] Furthermore, the insulating sleeve is made of alumina fiber, glass fiber, or basalt fiber.

[0009] Furthermore, one end of the sleeve body also has an annular flange, and the cylindrical metal mesh includes a straight cylindrical part and an annular part, with the annular part located at one end of the straight cylindrical part and inside the annular flange.

[0010] Furthermore, the straight section and the annular section of the cylindrical metal mesh are woven together as a single unit.

[0011] This invention also provides a method for manufacturing a liquid metal electromagnetic pump sleeve, comprising:

[0012] S1: Woven cylindrical metal mesh, including:

[0013] S11: Braiding warp threads, with several sections of insulating sleeves fitted onto the warp threads;

[0014] S12: Weaving the weft, place the insulating sleeve at the intersection of the weft and warp threads. The weft threads intertwine with the warp threads as they pass through, and the insulating sleeve separates the weft and warp threads. Place the insulating sleeve over one or both ends of the weft thread, then twist the ends of the weft thread together.

[0015] Together, the insulating sleeves separate the two ends of the weft thread;

[0016] S2: Place the woven cylindrical metal mesh into the mold, fill it with refractory castable, vibrate and compact it, and demold it after drying to obtain the finished sleeve.

[0017] The beneficial technical effects of the present invention compared with the prior art are as follows:

[0018] The sleeve of the liquid metal electromagnetic pump of the present invention is made of refractory castable, which can greatly save costs compared with silicon nitride ceramic sleeve. The sleeve has a metal mesh inside, which increases the structural strength of the sleeve. The warp and weft threads of the metal mesh are isolated from each other by insulating sleeves, which does not form annular eddy current channels and generate additional losses, and does not affect the normal operation of the traveling wave electromagnetic field of the electromagnetic pump. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the sleeve body in Embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the cylindrical metal mesh structure in Embodiment 1 of the present invention. Detailed implementation method:

[0021] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings and specific embodiments.

[0022] Example 1

[0023] like Figure 1 and 2 As shown, an electromagnetic pump sleeve for pumping molten aluminum includes a sleeve body 1, which is cast from refractory castable (purchased from Taobao, brand: Yourui, model AL-50, high temperature resistance 1400℃; mixed with water and cast according to the seller's instructions). The sleeve body 1 also contains a cylindrical metal mesh 2, coaxially arranged with the sleeve body 1. The cylindrical metal mesh 2 is woven from stainless steel wire, including warp and weft threads. Insulating sleeves separate the warp and weft threads at their intersections. The weft thread is formed by connecting single stainless steel wires end-to-end, and insulating sleeves separate the ends of the single wires at their intersections. The insulating sleeves are woven from high-temperature resistant alumina fiber, glass fiber, or basalt fiber.

[0024] For easy fixing, the upper part of the sleeve body 1 also has an annular flange 101, and the corresponding cylindrical metal mesh 2 also includes an annular part 201 and a straight part 202. The annular part 201 and the straight part 202 are woven together, and the annular part 201 is located inside the annular flange 101.

[0025] The manufacturing method of the above-mentioned electromagnetic pump sleeve includes:

[0026] S1: Woven cylindrical metal mesh

[0027] S11: Braiding warp threads, with several sections of insulating sleeves fitted onto the warp threads;

[0028] S12: Braid the weft yarn, place the insulating sleeve at the intersection of the weft and warp yarns, and wrap the weft yarn around the warp yarn once when it passes through it, tucking the insulating sleeve inside. The insulating sleeve separates the weft and warp yarns; then slip the insulating sleeve over one end of the weft yarn.

[0029] Then twist the two ends of the weft yarn together, and separate the two ends of the weft yarn with an insulating sleeve;

[0030] S2: Place the woven cylindrical metal mesh into the mold, fill it with refractory castable, vibrate and compact it, and demold it after drying to obtain the finished sleeve.

[0031] Example 2

[0032] Two more sets of electromagnetic pump sleeves of the same specifications were fabricated according to Example 1. The difference was that one set did not have a cylindrical metal mesh, while the other set had a cylindrical metal mesh but no insulating sleeves were added at the intersection of the warp and weft threads and at the ends of the weft threads. The electromagnetic pump sleeve from Example 1 was numbered 1, the electromagnetic pump sleeve without a cylindrical metal mesh was numbered 2, and the electromagnetic pump sleeve with a cylindrical metal mesh but without an insulating sleeve was numbered 3. Immersion experiments and aluminum pumping experiments were conducted sequentially under the same conditions. The experimental results are shown in Table 1 below. The immersion experiment conditions were as follows: the electromagnetic pump sleeve was partially immersed in molten aluminum for 4 hours, and every half hour it was removed, cooled to room temperature, and then immersed in aluminum again. After the experiment, the inner and outer walls of the electromagnetic pump sleeve were observed to see if there were any cracks. The electromagnetic pump was assembled according to the electromagnetic pump configuration in Chinese Invention CN2023115937764, and the aluminum pumping experiment was conducted according to the parameters in Chinese Invention CN 2023116683411 to observe the pumping effect of the aluminum.

[0033] Table 1 Comparison of experimental results

[0034] 1 2 3 Immersion in molten aluminum No cracks Cracks in the outer wall of the sleeve No cracks Pumping molten aluminum Normal pumping — Small amount of pumping

[0035] Note: Electromagnetic pump sleeve No. 2 posed a safety hazard due to a crack in its outer wall, and therefore was not tested for pumping molten aluminum.

[0036] Comparative experimental results show that the added metal mesh inside the sleeve significantly improves the structural strength of the sleeve and prevents it from cracking. In sleeves without insulating sleeves between the warp and weft threads of the metal mesh, the mesh forms annular eddy current channels, interfering with the normal operation of the electromagnetic pump's traveling wave electromagnetic field and leading to a decrease in pumping efficiency. However, in sleeves with insulating sleeves between the warp and weft threads, the mesh does not form annular eddy current channels and does not affect the normal operation of the electromagnetic pump.

Claims

1. A sleeve for a liquid metal electromagnetic pump, comprising a sleeve body, the sleeve body being cast from refractory castable, characterized in that, The sleeve body also has a cylindrical metal mesh inside, which is coaxial with the sleeve body. The cylindrical metal mesh includes warp and weft threads, and there is an insulating layer at the intersection of the warp and weft threads to separate them. The weft thread is made up of a single metal wire connected end to end, and there is an insulating layer at the intersection of the metal wires to separate the ends of the single metal wire.

2. The sleeve of a liquid metal electromagnetic pump according to claim 1, characterized in that, The cylindrical metal mesh is made of iron wire mesh or stainless steel wire mesh.

3. The sleeve of a liquid metal electromagnetic pump according to claim 1, characterized in that, The insulating layer is an insulating sleeve.

4. The sleeve of a liquid metal electromagnetic pump according to claim 3, characterized in that, The insulating sleeve is made of alumina fiber, glass fiber, or basalt fiber.

5. The sleeve of a liquid metal electromagnetic pump according to claim 1, characterized in that, One end of the sleeve body also has an annular flange. The cylindrical metal mesh includes a straight section and an annular section. The annular section is located at one end of the straight section and inside the annular flange.

6. The sleeve of a liquid metal electromagnetic pump according to claim 5, characterized in that, The straight section and the annular section of the ring-shaped metal mesh are integrally woven together.

7. A method for manufacturing a sleeve for a liquid metal electromagnetic pump, characterized in that, include: S1: Woven cylindrical metal mesh, including: S11: Braiding warp threads, with several sections of insulating sleeves fitted onto the warp threads; S12: Weaving the weft, placing the insulating sleeve at the intersection of the weft and warp, the weft winding around the warp when it passes through the warp, the insulating sleeve separating the weft and warp; putting the insulating sleeve on one or both ends of the weft, then twisting the two ends of the weft together, the insulating sleeve separating the two ends of the weft. S2: Place the woven cylindrical metal mesh into the mold, fill it with refractory castable, vibrate and compact it, and demold it after drying to obtain the finished sleeve.

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