Electromagnetic pump and optimization method

Abstract

The invention discloses an electromagnetic pump and an optimization method, and particularly relates to the technical field of electromagnetic pumps.The electromagnetic pump comprises an inner stator iron core, a first heat insulation layer, a first stainless steel pipe, second stainless steel and a second heat insulation layer which are sequentially and coaxially arranged from inside to outside, and a winding, a cooling pipeline and a plurality of outer stator iron cores are arranged on the outer side of the second heat insulation layer; the outer stator iron cores are uniformly arranged along the radial direction of the electromagnetic pump; the winding is wound on the periphery of the second heat insulation layer; the cooling pipeline is arranged between the winding and the second heat insulation layer and is in contact with the outer stator iron core; the copper pipe is used for cooling the outer stator iron core, the winding and the second heat insulation layer; design parameters of the cooling pipeline are optimized and selected through a genetic algorithm in combination with a finite element model. The technical problem that a conventional electromagnetic pump is low in liquid metal conveying efficiency is solved, the electromagnetic pump capable of efficiently conveying the high-temperature liquid metal is provided, and the conveying efficiency of the electromagnetic pump is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic pumps, and in particular to an electromagnetic pump and an optimization method applied to the electromagnetic pump. Background Art

[0002] Electromagnetic pumps have great advantages in the application of conveying liquid metals. However, due to the extremely low efficiency of electromagnetic pumps in conveying liquid metals, a large amount of electrical energy is wasted, which increases the operating cost of the equipment. Therefore, improving the efficiency of electromagnetic pumps has a significant effect on reducing the operating cost of equipment.

[0003] In the prior art, in order to solve the problem of extremely low efficiency of electromagnetic pumps, a patent for an electromagnetic pump core (CN202311588280.8) proposes the use of an inner core structure with oriented silicon steel sheets, which improves the magnetic permeability of the core and reduces iron loss, thereby improving the efficiency of the electromagnetic pump. However, due to the working temperature limit of the oriented silicon steel sheets (the temperature of the oriented silicon steel sheets needs to be controlled below 100°C) and the position structure of the inner stator core 1, this method can only be applied to the transportation of conventional liquids and is not suitable for the transportation of high-temperature liquid metals, especially ultra-high-temperature liquid metal liquids. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem in the prior art that the efficiency of electromagnetic pumps in conveying high-temperature liquid metal is extremely low. The present invention provides the following technical solutions:

[0005] An electromagnetic pump comprises an inner stator core, a first thermal insulation layer, a first stainless steel tube, a second stainless steel and a second thermal insulation layer which are coaxially arranged in sequence from the inside to the outside, wherein the first stainless steel tube and the second stainless steel tube are arranged at an interval and a pump groove for accommodating the passage of fluid is formed between the first stainless steel tube and the second stainless steel tube; a winding, a cooling pipeline and a plurality of outer stator cores are arranged on the outside of the second thermal insulation layer, the outer stator cores are evenly arranged along the radial direction of the electromagnetic pump, and the winding is wound around the outer periphery of the second thermal insulation layer; each of the outer stator cores is arranged in a serrated shape along the axial direction, and a receiving groove is formed between any two adjacent serrations, and the winding is just placed in the receiving groove corresponding to the outer stator core; the cooling pipeline is arranged between the winding and the second thermal insulation layer and in contact with the outer stator core, and the copper tube is used to cool the outer stator core, the winding and the second thermal insulation layer.

[0006] Preferably, the inner stator core is arranged in a cylindrical shape.

[0007] The outer stator core is formed by stacking oriented silicon steel sheets.

[0008] The rolling direction of the oriented silicon steel sheet is the radial direction of the electromagnetic pump.

[0009] Preferably, the number of the outer stator cores is six.

[0010] The cooling pipeline is a copper pipe, and the cooling pipeline is connected to a cooling circulation system.

[0011] Furthermore, the cooling pipeline is wound on the outer wall of the second thermal insulation layer, and when the cooling pipeline is wound through the outer stator core, the cooling pipeline passes through the receiving groove; the cooling pipeline is placed in the receiving groove, and the outer wall of the cooling pipeline is arranged between the winding and the second thermal insulation layer.

[0012] Furthermore, the cooling pipeline includes several cooling branches arranged in parallel, each of the cooling branches is connected to a main pipeline, and a circulating pump is provided on the main pipeline to form a cooling circulation loop; the number of the cooling branches is consistent with the number of the outer stator cores, and each cooling branch is arranged around an outer stator core to cool the outer stator core.

[0013] Furthermore, each of the cooling branches passes through all the receiving slots of the corresponding outer stator core one by one, and the cooling branch is located between the winding and the second thermal insulation layer.

[0014] A flow control valve is provided at the inlet end of each cooling branch, and a thermocouple is provided near each outer stator core, and the thermocouple is close to the inlet end of the cooling branch.

[0015] The design parameters of the cooling pipeline are optimized and selected by combining a genetic algorithm with a finite element model.

[0016] The design parameters of the cooling pipeline include the pipeline length, pipe diameter width, pipe wall thickness of the cooling pipeline and the flow rate of the cooling liquid in the cooling pipeline.

[0017] The design parameters of the cooling pipeline are optimized by combining a genetic algorithm with a finite element model, and the following steps are included:

[0018] S1: The temperature of the stator core is used as the basic constraint condition for optimization selection, and the basic constraint condition is used as the basis for terminating the iteration of the genetic algorithm;

[0019] S2: Setting the genetic algorithm module;

[0020] S3: According to the design size parameters of the electromagnetic pump design solution, the design parameters of the cooling pipeline are selected as optimization variable parameters of the genetic algorithm, the initial values ​​of the design parameters of the cooling pipeline are set, and a finite element model of the electromagnetic pump is established;

[0021] S4: Calculate the outer stator core temperature using the finite element model established in step S3;

[0022] S5: Determine whether the temperature of the outer stator core calculated in step S4 satisfies the basic constraint conditions set in step S1;

[0023] If the temperature of the outer stator core meets the basic constraint conditions set in step S1, the calculation is terminated, and the design parameters of the corresponding cooling pipeline at this time are output as the final optimization variable parameters after optimization selection;

[0024] If the temperature of the outer stator core does not meet the basic constraints set in step S1, update the optimization variable parameters of the genetic algorithm, and recalculate the temperature of the outer stator core through the finite element model until the temperature of the outer stator core output by the finite element model meets the basic constraints. The calculation is completed and the design parameters of the corresponding cooling pipeline are output as the final optimization variable parameters after optimization selection.

[0025] The modules of the genetic algorithm include the maximum number of iterations and the initial population number.

[0026] The present invention has the following advantages:

[0027] (1) The outer core stator of the present invention is made of oriented silicon steel sheets, which improves the magnetic permeability of the outer stator core and reduces iron loss, thereby improving the efficiency of the annular linear induction electromagnetic pump. The equipped liquid cooling system further expands the application range of the outer stator core made of oriented silicon steel sheets, so that it can be used in the transportation of high-temperature liquid metal.

[0028] (2) At the same time, the present invention ingeniously arranges the position and shape of the cooling circulation system so that the cooling pipeline can be in contact with the winding, the outer stator core, and the second thermal insulation layer at the same time. The cooling pipeline can not only cool the outer stator core and control the temperature of the outer stator core below 100°C to achieve the maximum magnetic permeability, but also the cooling pipeline is in contact with the winding, which can avoid the reduction of the electromagnetic pump efficiency due to the temperature rise of the winding after long-term operation; further, the cooling pipeline is in contact with the second thermal insulation layer, which can reduce the design thickness of the second thermal insulation layer. The reduction of the thickness of the second thermal insulation layer further improves the efficiency of the annular linear induction electromagnetic pump. The above three beneficial effects are combined to greatly improve the efficiency of the electromagnetic pump, which not only further expands the application scope of the outer stator core with oriented silicon steel sheets, but also enables it to be used in the transportation of high-temperature liquid metal.

[0029] (3) The electromagnetic pump technical solution provided by the present invention effectively isolates the influence of the temperature of the high-temperature liquid being transported on the outer stator core and the inner stator core by adding a first insulation layer and a second insulation layer, so that the electromagnetic pump can be used to transport high-temperature metal liquid, filling the gap in the application of electromagnetic pumps in the field of transporting high-temperature liquid metal.

[0030] (4) The present invention calculates the relevant parameters of the cooling pipeline by combining a genetic algorithm with a finite element model. The genetic algorithm can effectively avoid local optimal solutions through population search and genetic operations, has strong global search capabilities, and does not require a specific mathematical model to solve complex optimization and combination problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention from top view;

[0032] Figure 2 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0033] Figure 3 This is a schematic diagram of a side cross-sectional structure of a stator core and a cooling pipeline in an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of a top view of the structure of an outer stator core and a cooling branch according to another embodiment of the present invention;

[0035] Figure 5 A schematic diagram of a side cross-sectional structure of an outer stator core and a cooling branch according to another embodiment of the present invention;

[0036] Figure 6 The figure is a flow chart of the optimization method of the cooling pipeline design parameters of the present invention.

[0037] Among them: 1. inner stator core, 2. first thermal insulation layer, 3. first stainless steel pipe, 4. second stainless steel pipe, 5. second thermal insulation layer, 6. pump groove, 7. winding, 8. cooling pipeline, 9. outer stator core, 10. receiving groove, 11. cooling branch, 12. flow control valve. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0041] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "upper", "lower", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] See also Figures 1 to 6, an electromagnetic pump, comprising an inner stator core 1, a first insulation layer 2, a first stainless steel tube 3, a second stainless steel tube 4 and a second insulation layer 5 which are coaxially arranged in sequence from the inside to the outside, wherein the first stainless steel tube 3 and the second stainless steel tube 4 are arranged at intervals and a pump groove 6 for accommodating the passage of fluid is formed between the first stainless steel tube 3 and the second stainless steel tube 4; a winding 7, a cooling pipeline 8 and a plurality of outer stator cores 9 are arranged on the outside of the second insulation layer 5, the outer stator cores 9 are evenly arranged along the radial direction of the electromagnetic pump, and the winding 7 is wound around the outer periphery of the second insulation layer 5; each of the outer stator cores 9 is arranged in a serrated shape along the axial direction, and a receiving groove 10 is formed between any two adjacent saw teeth, and the winding 7 is just placed in the receiving groove 10 corresponding to the outer stator core 9; the cooling pipeline 8 is arranged between the winding 7 and the second insulation layer 5 and in contact with the outer stator core 9, and the copper tube is used to cool the outer stator core 9, the winding 7 and the second insulation layer 5. The first insulation layer 2 and the second insulation layer 5 are used for heat insulation. This is because the electromagnetic pump designed by the present invention is designed to provide an electromagnetic pump that can be used to efficiently transport high-temperature metal liquid. The first insulation layer 2 and the second insulation layer 5 can effectively isolate the heat of the high-temperature metal liquid flowing through the pump groove 6, and prevent the heat of the high-temperature metal liquid from affecting the temperature of the inner stator core 1, the outer stator core 9 and the winding 7, thereby affecting the efficiency of the electromagnetic pump. At the same time, the outer stator core 9 and the winding 7 will heat up due to their own performance during long-term use and operation, especially the winding 7 that needs to be energized; and the increase in the temperature of the outer stator core 9 and the winding 7 will affect the efficiency of the electromagnetic pump, thereby reducing the liquid transportation capacity of the electromagnetic pump. The present invention solves the technical problem by adding a cooling pipeline 8. Moreover, since the cooling pipeline 8 is arranged between the winding 7 and the second thermal insulation layer 5 and is in contact with the outer stator core 9 at the same time, the purpose of simultaneously cooling the outer stator core 9 and the winding 7 is solved through a cooling pipeline 8, so that the temperature of the outer stator core 9 and the winding 7 will not increase during the operation of the electromagnetic pump. Moreover, since the cooling pipeline 8 is in contact with the second thermal insulation layer 5, the effect of cooling the second thermal insulation layer 5 is achieved, and the design thickness of the second thermal insulation layer 5 can be reduced. The reduction in the thickness of the second thermal insulation layer 5 can further improve the magnetic permeability, thereby improving the efficiency of the annular linear induction electromagnetic pump.

[0043] In one embodiment of the present invention, the inner stator core 1 is cylindrical.

[0044] In one embodiment of the present invention, the outer stator core 9 is made of stacked oriented silicon steel sheets. The rolling direction of the oriented silicon steel sheets is the radial direction of the electromagnetic pump. The outer stator core 9 made of oriented silicon steel sheets can improve the magnetic permeability of the outer stator core 9, while reducing iron loss and improving the delivery efficiency of the electromagnetic pump. However, there are requirements for the use temperature of the outer stator core 9 made of stacked oriented silicon steel sheets. Experiments have found that when the temperature of the outer stator core 9 made of stacked oriented silicon steel sheets is above 100°C, it will greatly affect the magnetic permeability and reduce the delivery efficiency of the electromagnetic pump, which is obviously not suitable for high-temperature and ultra-high-temperature metal liquids. The present invention can effectively cool the outer stator core 9 by adding a cooling pipeline 8, and the cooling pipeline 8 is in contact with the winding 7, the outer stator core 9, and the second insulation layer 5 at the same time, so that the cooling pipeline 8 can not only cool the outer stator core 9, but also control the temperature of the outer stator core 9 below 100°C to achieve the maximum magnetic permeability. At the same time, the cooling pipeline 8 is also in contact with the winding 7, which can avoid the electromagnetic pump efficiency being reduced due to the temperature rise of the winding 7 after long-term work; further, the cooling pipeline 8 is in contact with the second insulation layer 5, which can reduce the design thickness of the second insulation layer 5. The reduction in the thickness of the second insulation layer 5 further improves the efficiency of the annular linear induction electromagnetic pump. The above three beneficial effects are combined to greatly improve the efficiency of the electromagnetic pump, which not only further expands the application scope of the outer stator core 9 with oriented silicon steel sheets, but also enables it to be applied to the transportation of high-temperature liquid metal.

[0045] Preferably, the number of the outer stator cores 9 is six.

[0046] Preferably, the cooling pipeline 8 is a copper tube, and the cooling pipeline 8 is connected to the cooling circulation system. After the cooling pipeline 8 is connected to the cooling circulation system, the cooling pipeline 8 cools the circulation; or the inlet end of the cooling pipeline 8 is connected to the outlet end of the cooling pipeline 8 to form a closed loop, and a circulation pump is installed on the cooling pipeline 8 to form a closed circulation loop. When the cooling liquid flows through the inside of the electromagnetic pump, it exchanges heat with the outer stator core 9, the winding 7, and the second insulation layer 5, taking away the heat of the outer stator core 9, the winding 7, and the second insulation layer 5. Then the cooling pipeline 8 exchanges heat with the air outside the electromagnetic pump or the heat exchanger, so that the cooling liquid in the cooling pipeline 8 is cooled and the next heat exchange cycle is carried out. The cooling circulation system is provided with a circulation pump to enable the cooling pipeline 8 to realize the circulation of the cooling liquid.

[0047] See also Figures 1 to 3In one embodiment of the present invention, the cooling pipe 8 is wound on the outer wall of the second thermal insulation layer 5, and when the winding path of the cooling pipe 8 passes through the outer stator core 9, the cooling pipe 8 passes through the receiving groove 10; the cooling pipe 8 is placed in the receiving groove 10, and the outer wall of the cooling pipe 8 is arranged between the winding 7 and the second thermal insulation layer 5. In this design, when the cooling pipe 8 passes through the outer stator core 9, the cooling pipe 8 is placed exactly in the receiving groove 10 of the outer stator core 9. At this time, the outer wall of the cooling pipe 8 is in contact with the outer stator core 9 at the same time, which can cool down the outer stator core 9, and at the same time, it is in contact with the part of the winding 7 placed in the receiving groove 10, which can cool down the winding 7. At the same time, the cooling pipe 8 is wound on the second thermal insulation layer 5 in a winding manner, which plays a role in cooling down the thermal insulation layer.

[0048] See also Figure 4 and Figure 5 In another embodiment of the present invention, the cooling pipeline 8 includes a plurality of cooling branches 11 arranged in parallel, each of the cooling branches 11 is connected to a main pipeline, and the main pipeline is connected to a cooling circulation system. A circulating pump is provided on the main pipeline to form a cooling circulation loop; the number of the cooling branches 11 is consistent with the number of the outer stator cores 9, and each cooling branch 11 is arranged around an outer stator core 9 to cool the outer stator core 9. Furthermore, each of the cooling branches 11 passes through all the receiving slots 10 of the corresponding outer stator core 9 one by one, and the cooling branch 11 is located between the winding 7 and the second thermal insulation layer 5. According to this design, a cooling branch 11 is correspondingly arranged on the outer wall of each outer stator core 9, and each cooling branch 11 is used to cool the outer stator core 9 corresponding to the cooling branch 11; the cooling branches 11 pass through the corresponding receiving slots 10 of the outer stator core 9 one by one, and are arranged in a continuously curved shape; the cooling branches 11 are wound around the serrations of the outer stator core 9, and are used to cool the outer stator core 9. At the same time, each cooling branch 11 passes through the corresponding receiving slots 10 of the outer stator core 9 and contacts the winding 7, so the winding 7 can be cooled. Furthermore, the cooling branch 11 contacts the second thermal insulation layer 5, and plays a role in cooling the second thermal insulation layer 5.

[0049] Furthermore, a flow control valve 12 is provided at the inlet end of each cooling branch 11, and a thermocouple is provided near each outer stator core 9, and the thermocouple is close to the inlet end of the cooling branch 11. The thermocouple is used to detect the temperature at the inlet end of the cooling branch 11, and the flow control valve 12 and the circulating pump are connected to the control panel, and the control panel realizes the electronic control of the flow control valve 12 and the circulating pump. The reality is that during the use of the electromagnetic pump, each outer stator core 9 has a different specific temperature after working for a period of time due to the instability and fluctuation difference of the liquid metal liquid being transported. When the flow control valve 12 is provided at the inlet end of each cooling branch 11, the temperature of each outer stator core 9 can be detected by the thermocouple, and the flow control valve 12 can be adjusted according to the different temperatures of each outer stator core 9 to achieve the purpose of controlling the flow and flow rate of each cooling branch 11, thereby realizing accurate temperature control of each outer stator core 9, reducing energy waste, and thus improving the overall efficiency of the electromagnetic pump.

[0050] The design parameters of the cooling pipeline 8 are optimized and selected by combining a genetic algorithm with a finite element model.

[0051] The design parameters of the cooling pipeline 8 include the pipeline length, the pipe diameter width, the pipe wall thickness of the cooling pipeline 8 and the flow rate of the cooling liquid in the cooling pipeline 8 .

[0052] See also Figure 6 : The design parameters of the cooling pipeline 8 are optimized by genetic algorithm combined with finite element model, including the following steps:

[0053] S1: The temperature of the outer stator core 9 is used as a basic constraint condition for optimization selection, and the basic constraint condition is used as a basis for terminating the iteration of the genetic algorithm; further, the temperature of the outer stator core 9 is set to be no higher than 100 degrees Celsius as a basic constraint condition.

[0054] S2: Set the module of the genetic algorithm, which includes the maximum number of iterations and the initial population number; the initial population is a set of individuals generated by a random method in the genetic algorithm. Furthermore, the maximum number of iterations is 30, the initial population number is 20, and the maximum number of iterations means that the genetic algorithm is calculated at most 30 times.

[0055] S3: According to the design dimension parameters of the electromagnetic pump design scheme, the design parameters of the cooling pipeline 8 are selected as the optimization variable parameters of the genetic algorithm, the initial values ​​of the design parameters of the cooling pipeline 8 are set, and the finite element model of the electromagnetic pump is established; the design dimension parameters of the electromagnetic pump are obtained according to the actual design requirements of the electromagnetic pump, including the slot width of the receiving slot 10, the sawtooth pitch and other parameters; the initial values ​​of the design parameters of the cooling pipeline 8 are specific values ​​inferred by the technicians based on a reasonable evaluation of the design parameters of the electromagnetic pump, and then calculated and verified by combining the genetic algorithm with the finite element model.

[0056] S4: The temperature of the outer stator core 9 is calculated by the finite element model established in step S3; step S4 is to calculate the temperature of the outer stator core 9 by the finite element model according to the initial values ​​of the design parameters of the cooling pipeline 8.

[0057] S5: Determine whether the temperature of the outer stator core 9 calculated in step S4 satisfies the basic constraint conditions set in step S1;

[0058] If the temperature of the outer stator core 9 meets the basic constraint conditions set in step S1, the calculation is terminated, and the design parameters of the corresponding cooling pipeline 8 are output as the final optimized variable parameters after optimization selection;

[0059] If the temperature of the outer stator core 9 does not meet the basic constraints set in step S1, the genetic algorithm re-evaluates and infers the specific values ​​of the design parameters of the cooling pipeline 8 based on the design parameters of the electromagnetic pump, updates the optimization variable parameters of the genetic algorithm, and recalculates the temperature of the outer stator core 9 through the finite element model until the temperature of the outer stator core 9 output by the finite element model meets the basic constraints. The calculation is completed and the design parameters of the cooling pipeline 8 corresponding to this time are output as the final optimization variable parameters after optimization selection, that is, the preferred values ​​of the design parameters of the cooling tube bundle under the basic constraints.

[0060] To sum up, the present invention not only provides an electromagnetic pump, but the electromagnetic pump equipped with the electromagnetic pump assembly not only overcomes the problem that the current electromagnetic pump cannot be used to transport high-temperature liquid metal, but also provides a method for transporting high-temperature liquid metal. At the same time, through the design of the cooling pipeline 8, the temperature of the outer stator core 9, the winding 7 and the thickness of the second insulation layer 5 are optimized, thereby improving the transportation efficiency of the electromagnetic pump and overcoming the technical problem of poor transportation efficiency of the electromagnetic pump in the prior art; further, the present invention selects an outer stator core 9 made of oriented silicon steel sheets, utilizes the advantages of the outer stator core 9 with oriented silicon steel sheets having high magnetic permeability and low iron loss, and overcomes the problem of low efficiency in transporting high-temperature liquid metal due to temperature limitation of the outer stator core 9 with oriented silicon steel sheets through the cooling pipeline 8. Furthermore, the present invention also provides a method for calculating the design parameters of the cooling pipeline 8 by combining a genetic algorithm with a finite element model to calculate the relevant parameters of the cooling pipeline 8. The population search and genetic operation of the genetic algorithm can effectively avoid local optimal solutions, and it has a strong global search capability. At the same time, it does not require a specific mathematical model to solve complex optimization and combination problems.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electromagnetic pump, characterized in that: The invention comprises an inner stator core, a first heat insulation layer, a first stainless steel tube, a second stainless steel tube and a second heat insulation layer which are coaxially arranged in sequence from the inside to the outside, wherein the first stainless steel tube and the second stainless steel tube are arranged at an interval and a pump groove for accommodating the passage of fluid is formed between the first stainless steel tube and the second stainless steel tube; a winding, a cooling pipeline and a plurality of outer stator cores are arranged on the outside of the second heat insulation layer, the outer stator cores are evenly arranged along the radial direction of the electromagnetic pump, and the windings are wound around the outer periphery of the second heat insulation layer; each of the outer stator cores is arranged in a serrated shape along the axial direction, and a receiving groove is formed between any two adjacent serrations, and the winding is just placed in the receiving groove corresponding to the outer stator core; the cooling pipeline is arranged between the winding and the second heat insulation layer and in contact with the outer stator core, and the copper tube is used to cool the outer stator core, the winding and the second heat insulation layer.

2. An electromagnetic pump according to claim 1, characterized in that: The outer stator core is formed by stacking oriented silicon steel sheets.

3. An electromagnetic pump according to claim 2, characterized in that: The rolling direction of the oriented silicon steel sheet is the radial direction of the electromagnetic pump.

4. An electromagnetic pump according to claim 1, characterized in that: The cooling pipeline is a copper pipe, and the cooling pipeline is connected to a cooling circulation system.

5. The electromagnetic pump according to claim 1, characterized in that: The cooling pipeline is wound on the outer wall of the second thermal insulation layer, and when the cooling pipeline is wound through the outer stator core, the cooling pipeline passes through the receiving groove; the cooling pipeline is placed in the receiving groove, and the outer wall of the cooling pipeline is arranged between the winding and the second thermal insulation layer.

6. The electromagnetic pump according to claim 1, characterized in that: The number of the outer stator cores is six.

7. An optimization method for an electromagnetic pump according to any one of claims 1 to 6, characterized in that: The design parameters of the cooling pipeline are optimized and selected by combining a genetic algorithm with a finite element model.

8. The optimization method according to claim 7, characterized in that: The design parameters of the cooling pipeline include the pipeline length, pipe diameter width, pipe wall thickness of the cooling pipeline and the flow rate of the cooling liquid in the cooling pipeline.

9. The optimization method according to claim 7, characterized in that: The design parameters of the cooling pipeline are optimized by combining a genetic algorithm with a finite element model, and the following steps are included: S1: The temperature of the stator core is used as the basic constraint condition for optimization selection, and the basic constraint condition is used as the basis for terminating the iteration of the genetic algorithm; S2: Setting the genetic algorithm module; S3: According to the design size parameters of the electromagnetic pump design solution, the design parameters of the cooling pipeline are selected as optimization variable parameters of the genetic algorithm, the initial values ​​of the design parameters of the cooling pipeline are set, and a finite element model of the electromagnetic pump is established; S4: Calculate the outer stator core temperature using the finite element model established in step S3; S5: Determine whether the temperature of the outer stator core calculated in step S4 satisfies the basic constraint conditions set in step S1; If the temperature of the outer stator core meets the basic constraint conditions set in step S1, the calculation is terminated, and the design parameters of the corresponding cooling pipeline at this time are output as the final optimization variable parameters after optimization selection; If the temperature of the outer stator core does not meet the basic constraints set in step S1, update the optimization variable parameters of the genetic algorithm, and recalculate the temperature of the outer stator core through the finite element model until the temperature of the outer stator core output by the finite element model meets the basic constraints. The calculation is completed and the design parameters of the corresponding cooling pipeline are output as the final optimization variable parameters after optimization selection.

10. The optimization method according to claim 9, characterized in that: The modules of the genetic algorithm include the maximum number of iterations and the initial population number.

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