CN112803712A - Liquid metal electromagnetic pump - Google Patents
Liquid metal electromagnetic pump Download PDFInfo
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- CN112803712A CN112803712A CN202110127637.7A CN202110127637A CN112803712A CN 112803712 A CN112803712 A CN 112803712A CN 202110127637 A CN202110127637 A CN 202110127637A CN 112803712 A CN112803712 A CN 112803712A
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- liquid metal
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- electromagnetic pump
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K44/00—Machines in which the dynamo-electric interaction between a plasma or flow of conductive liquid or of fluid-borne conductive or magnetic particles and a coil system or magnetic field converts energy of mass flow into electrical energy or vice versa
- H02K44/02—Electrodynamic pumps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K44/00—Machines in which the dynamo-electric interaction between a plasma or flow of conductive liquid or of fluid-borne conductive or magnetic particles and a coil system or magnetic field converts energy of mass flow into electrical energy or vice versa
- H02K44/02—Electrodynamic pumps
- H02K44/06—Induction pumps
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a liquid metal electromagnetic pump, comprising: a flow conduit (30) having a flow inlet for receiving an inflow of liquid metal and a flow outlet for conveying the liquid metal outwardly; and an electromagnetic drive for providing an electromagnetic force for driving the liquid metal from the fluid inlet to the fluid outlet, the electromagnetic drive comprising: the shell (60) is arranged on the radial inner side of the liquid flow pipeline (30), a vacuum cavity is formed inside the shell (60), and an annular flow channel communicated with the liquid flow inlet and the liquid flow outlet and allowing liquid metal to flow is formed between the outer surface of the shell (60) and the inner surface of the liquid flow pipeline (30); and an inner core (50) disposed in the vacuum chamber, and at least a part of an outer surface of the inner core (50) is closely attached to a radially inner surface of the housing (60). The technical scheme of the invention can solve the problem of poor working stability of the liquid metal electromagnetic pump in the prior art.
Description
Technical Field
The invention relates to the technical field of electromagnetic pumps, in particular to a liquid metal electromagnetic pump.
Background
As an important liquid metal conveying device, the liquid metal electromagnetic pump has the advantages of no medium contact, no moving part, complete sealing, simple and convenient maintenance and the like, and is widely applied to the field of nuclear power. The temperature of the medium of the electromagnetic pump in the nuclear safety level application scene of the reactor engineering is generally higher, and the reliability requirement is severer. At present, the working stability of a liquid metal electromagnetic pump is not high, and the nuclear safety level application requirement of reactor engineering cannot be met.
Disclosure of Invention
The invention aims to improve the working stability of the liquid metal electromagnetic pump.
In order to achieve the above object, the present invention provides a liquid metal electromagnetic pump, comprising:
a liquid flow pipe having a liquid flow inlet for receiving the inflow of liquid metal and a liquid flow outlet for delivering the liquid metal outwardly; and
an electromagnetic drive device for providing an electromagnetic force for driving the liquid metal to flow from the fluid inlet to the fluid outlet, the electromagnetic drive device comprising:
a housing disposed radially inward of the fluid conduit, the housing defining a vacuum chamber therein, an annular liquid metal flow passage formed between an outer surface of the housing and an inner surface of the fluid conduit and communicating with the fluid inlet and the fluid outlet
A flow channel; and
and the inner iron core is arranged in the vacuum chamber, and at least part of the outer surface of the inner iron core is tightly attached to the radial inner surface of the shell.
Further, all outer surfaces of the inner core are in close fit with the radial inner surface of the shell.
Further, a peripheral wall of the housing surrounding the radially outer surface of the inner core is configured to: can be inside take place deformation under its inside and outside both sides pressure differential's effect to with the radial surface of inside iron core closely laminates, thereby improves the heat and is in inside iron core with conduction efficiency between the casing.
Furthermore, the shell comprises a first flow guide section with gradually expanded inner diameter, a sleeve section with uniform inner diameter and a second flow guide section with gradually reduced inner diameter which are sequentially connected along the flowing direction of the liquid metal;
wherein the sleeve segment forms a circumferential wall around the radially outer surface of the inner core.
Further, the electromagnetic driving device further includes: an inner support tube arranged in the vacuum chamber and connected with the first flow guide section and the second flow guide section in a clearance fit manner, wherein
The inner iron core is tightly sleeved on the radial outer side of the inner supporting tube.
Furthermore, a plurality of annular accommodating grooves are axially arranged on the radial outer surface of the inner iron core at intervals,
the electromagnetic driving device further comprises a plurality of annular heat conducting members, and each annular heat conducting member is arranged in one accommodating groove so as to improve the heat conduction efficiency between the inner iron core and the shell.
Further, the electromagnetic driving device further includes:
an outer core extending in an axial direction of the liquid flow pipe at a radially outer side thereof, the outer core being provided with a plurality of winding slots along a length direction thereof; and
and the coils are sleeved on the radial outer side of the liquid flow pipeline, and each coil is arranged in one winding groove of the outer iron core.
Further, the external iron core comprises a plurality of strip-shaped iron cores extending along the axial direction, the strip-shaped iron cores are arranged at equal intervals along the circumferential direction of the liquid flow pipeline on the radial outer side of the liquid flow pipeline, each strip-shaped iron core is provided with a plurality of iron core slots along the axial direction, and the iron core slots of the plurality of strip-shaped iron cores at the same position in the axial direction jointly form one winding slot; wherein
And a heat dissipation hole is formed between two adjacent iron core slots.
Further, a heat insulation layer is arranged between the external iron core and the liquid flow pipeline.
Further, the liquid metal electromagnetic pump further comprises: two support assemblies for supporting said fluid flow conduit and said electromagnetic drive, each said support assembly being disposed at an axial end of said fluid flow conduit and said electromagnetic drive, each said support assembly comprising:
the support is arranged on one axial side of the liquid flow pipeline, a through hole for the liquid flow pipeline to pass through is formed in the support, and one axial end of the external iron core is thermally connected with the support; and
the flange is provided with a through hole for the liquid flow pipeline to pass through, the flange is fixedly connected with the liquid flow pipeline, and one side of the support far away from the external iron core is fixedly connected with the support.
Further, a side surface of the flange facing the holder is formed with a projection projecting toward the holder, and the flange is in contact with the holder through the projection.
Further, the boss is an annular flange formed on the periphery of the flange.
Further, a plurality of ribs are arranged on the contact surface of the bulge part and the support.
Furthermore, a plurality of flange slots are formed in the circumferential edge of the flange;
each of the support assemblies further comprises: a plurality of fasteners, each fastener passing through one of the flange slots to fixedly connect the flange with the support.
Further, the electromagnetic driving device further includes:
a support disposed radially outward of the housing to support the housing radially inward of the flow conduit.
In the prior art, the liquid metal electromagnetic pump has poor stability in the working process of pumping high-temperature liquid metal. The inventor of the application finds that the liquid metal electromagnetic pump has poor stability and fails due to high-temperature magnetic loss of the magnetizer serving as the external iron core. In order to solve the heat dissipation problem, in the related art, a cooling fan is used to perform forced air cooling heat dissipation on the liquid metal electromagnetic pump. However, the internal environment of the reactor is severe, and the reliability of the liquid metal electromagnetic pump is greatly reduced by using the cooling fan. In addition, for the internal iron core arranged in the liquid flow pipeline, because the internal iron core is arranged in the sealed shell, and the shell is positioned in the high-temperature liquid metal, the effective heat dissipation of the internal iron core is difficult. Therefore, in the prior art, the prevention of high-temperature demagnetization of the internal iron core is generally realized by reducing the temperature of the liquid metal, and structural improvement of the internal iron core is not considered. The inventor of the present application has found that, in some cases, the internal heat is not effectively conducted due to the uneven temperature at each position inside the internal core, which causes a problem of local heat accumulation, and causes high-temperature demagnetization of a partial structure of the internal core. This application sets the vacuum chamber to casing inside especially, makes the at least partial surface of inside iron core closely laminate with the radial internal surface of casing for casing and inside iron core closely effective contact under high temperature improve the heat conduction efficiency between inside iron core and casing, are favorable to reducing inside iron core and take place high temperature and lose magnetism.
Further, this application carries out special design through the perisporium with casing section, makes the casing section can inwards take place deformation under the effect of its inside and outside both sides pressure differential to with the inseparable laminating of the radial surface of inside iron core, thereby can further improve the conduction efficiency of heat between inside iron core and casing.
Further, the inside iron core of liquid metal electromagnetic pump among the prior art is formed by the silicon steel sheet system of folding along the axial extension usually, and inside iron core is relatively poor at the ascending heat transfer effect of week, and this application further utilizes annular heat-conducting piece to strengthen heat-conduction between the different silicon steel sheets and heat-conduction between each silicon steel sheet and the casing, is favorable to inside iron core and casing closely effective contact under high temperature more, has solved the hot problem of gathering of inside iron core, greatly reduced inside iron core high temperature magnetic risk of losing. Meanwhile, the design of the annular heat conducting piece can also avoid the problem that the sleeve section of the shell is radially bent at high temperature.
Further, this application is connected with first water conservancy diversion section and second water conservancy diversion section with clearance fit's mode through interior stay tube, has effectively reduced the thermal stress that produces by difference in temperature and material difference, has solved the thermal ratchet damage and the axial high temperature buckling problem of casing, has improved the job stabilization nature of liquid metal electromagnetic pump.
Further, this application has strengthened the circulation of air around the coil through set up the louvre and carry out special design to the grooved size of iron core on bar iron core, has further reduced the fault rate of liquid metal electromagnetic pump.
Further, this application carries out special design through the flange to supporting component for the flange possesses excellent thermal adaptability and thermal-insulated ability, both can be directly closely cooperate and do not produce big thermal stress with high temperature liquid flow pipeline, thereby guarantee to the firm support of liquid flow pipeline, can effectively alleviate the heat-conduction of high temperature liquid metal to outside iron core and coil again, has further reduced the fault rate of liquid metal electromagnetic pump.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
FIG. 1 is a schematic diagram of a liquid metal electromagnetic pump according to one embodiment of the present invention;
FIG. 2 is a schematic view of another angle configuration of the liquid metal electromagnetic pump of FIG. 1;
FIG. 3 is a partial cross-sectional view of the liquid metal electromagnetic pump shown in FIG. 2 taken along the A-A direction;
FIG. 4 is an enlarged view of a portion of the area C shown in FIG. 3;
FIG. 5 is a cross-sectional schematic view of the housing shown in FIG. 3;
FIG. 6 is an enlarged view of a portion of the area D shown in FIG. 5;
fig. 7 is a partial structural view of the inner core shown in fig. 5;
FIG. 8 is an enlarged partial view of area E of FIG. 7;
FIG. 9 is a schematic view of another angle configuration of the liquid metal electromagnetic pump of FIG. 1;
FIG. 10 is a cross-sectional view of the liquid metal electromagnetic pump of FIG. 9 taken along the direction B-B;
FIG. 11 is a schematic structural view of the flange of FIG. 1;
fig. 12 is a partially enlarged view of the region F shown in fig. 11.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Description of reference numerals:
100. a liquid metal electromagnetic pump; 10. a coil; 20. a strip-shaped iron core; 21. slotting the iron core; 22. heat dissipation holes; 23. a mounting member; 30. a liquid flow conduit; 31. an inlet flow guide section; 32. an outlet flow guide section; 33. a cylinder section; 40. a support; 41. a support through hole; 42. a first fastener; 43. a fastener; 50. an inner core; 51. a containing groove; 60. a housing; 61. a first flow guide section; 62. a casing section; 63. a second flow guide section; 64. an inner support tube; 65. an annular heat-conducting member; 66. a support member; 70. a thermal insulation layer; 80. a flange; 81. grooving the flange; 82. a boss portion; 83. a rib; 90. a heat insulating spacer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined.
The meaning of "a plurality" in the description of embodiments of the invention is at least two, e.g., two, three, etc., unless explicitly specified otherwise.
Referring to fig. 1 to 10, a liquid metal electromagnetic pump 100 according to an embodiment of the present invention may include: a fluid flow conduit 30 and an electromagnetic drive. The flow conduit 30 has a flow inlet for receiving the inflow of liquid metal and a flow outlet for delivering the liquid metal outwardly. In some embodiments, as shown in fig. 3-4, the flow conduit 30 may include a diverging inner diameter inlet flow section 31, a uniform inner diameter cylindrical section 33, and a diverging inner diameter outlet flow section 32, which are connected in series along the direction of liquid metal flow. The cylindrical section 33 may be a thin-walled circular tube, and the inlet guide section 31 and the outlet guide section 32 may be thick-walled pipes. The inner diameters of the ports of the inlet guide section 31 and the outlet guide section 32 on the side away from the cylindrical section 33 are smaller, and the ports are respectively used as a liquid flow inlet and a liquid flow outlet of the liquid flow pipeline 30.
The electromagnetic drive device is used for providing electromagnetic force for driving the liquid metal to flow from the liquid flow inlet to the liquid flow outlet. The liquid metal electromagnetic pump 100 of the embodiment of the application, in the use process, the liquid metal with high temperature is driven by the electromagnetic driving device to flow into the liquid metal electromagnetic pump 100 from the liquid flow inlet and flow out from the liquid flow outlet, so that the pumping effect on the liquid metal is realized.
In some embodiments, the electromagnetic drive may comprise: an outer core disposed radially outward of the flow conduit 30 and a plurality of coils 10. The outer core extends axially along the flow conduit 30 (e.g., cylindrical section 33) radially outward thereof.
The outer core is provided with a plurality of winding slots along its length. The coil 10 is disposed radially outwardly of the flow conduit 30 (e.g., cylindrical section 33). Each coil 10 is arranged in one winding slot of the outer core.
The flow conduit 30 also typically has a relatively high temperature due to the liquid metal flowing into the flow conduit 30 being at a relatively high temperature. Referring to fig. 4, an insulating layer 70 may be disposed between the outer core and the flow conduit 30 to reduce heat transfer therebetween to prevent excessive temperatures of the outer core and the coil 10. In some embodiments, the thermal insulation layer 70 may be a nano aerogel blanket with an inorganic matrix and a thickness of 2-10 mm.
The coil 10 may be formed by winding a wire having an insulating layer on a surface thereof in a radial direction. The number of the winding slots and the coils 10 can be integral multiples of 3, the coils 10 adopt a triangular circuit connection method, the coils 10 are electrified with variable currents with phase difference of 120 degrees, and the generated travelling wave magnetic field acts on the liquid metal medium to push the liquid metal to flow in the liquid flow pipeline 30.
In some embodiments, referring to fig. 1 and 3, the outer core includes a plurality of bar cores 20 extending along the axial direction, the bar cores 20 are arranged at equal intervals along the circumferential direction of the liquid flow pipe 30 at the radial outer side, each bar core 20 is provided with a plurality of core slots 21 along the axial direction or the length direction, and the core slots 21 of the bar cores 20 at the same position along the axial direction jointly form one winding slot of the outer core.
In the prior art, the liquid metal electromagnetic pump 100 has poor stability during the working process of pumping high-temperature liquid metal. The inventor of the present application has found that high-temperature demagnetization of a magnetizer serving as an external iron core causes poor stability and failure of the liquid metal electromagnetic pump 100. To solve the heat dissipation problem, in the related art, a heat dissipation fan is used to perform forced air cooling heat dissipation on the liquid metal electromagnetic pump 100. However, the internal environment of the reactor is severe, and the reliability of the liquid metal electromagnetic pump 100 is greatly reduced by using the cooling fan.
Accordingly, the inventors of the present application have made improvements to the structure of the outer core. In particular, in some embodiments, a heat dissipation hole 22 is further opened between two adjacent iron core slots 21. Referring to fig. 3, that is, core slots 21 and heat dissipation holes 22 are alternately provided in the length direction of the bar-shaped core 20. The heat dissipation holes 22 are formed between the iron core slots 21 of the external iron core, so that flow channels for free circulation of air are formed on two sides of each coil 10, the heat dissipation area of the external iron core is greatly increased, and the space condition of natural convection heat transfer is obviously improved. Through the design, on the premise that the magnetic conductivity of the external iron core is not affected, the complete air circulation pore passage is formed by the heat dissipation holes 22, and the coil 10 and the external iron core are effectively dissipated.
Further, in some embodiments, the radial depth of the core slots 21 is greater than the radial width of the coil 10, thereby forming channels radially outward of the coil 10 to facilitate air circulation, thereby reducing the temperature of the coil 10 and the outer core. In some embodiments, the radial depth of the core slot 21 may be 0.5-3cm more than the radial width of the coil 10.
According to the embodiment of the application, the radiating holes 22 are formed in the strip-shaped iron core 20, and the size of the iron core slot 21 is specially designed, so that the air circulation around the coil 10 is enhanced, and the fault rate of the liquid metal electromagnetic pump 100 is reduced.
In some embodiments, the number of the bar-shaped iron cores 20 may be even, and the even number of the bar-shaped iron cores 20 are uniformly distributed along the circumferential direction on the radial outer side of the liquid flow pipe 30 so as to form a symmetrical magnetic field. In the illustrated embodiment, the number of the bar-shaped iron cores 20 is 8, and the 8 bar-shaped iron cores 20 are uniformly distributed in the circumferential direction on the radial outer side of the liquid flow pipe 30. In other embodiments, the number of the strip-shaped iron cores 20 may also be 4, 6, 10, etc.
In some embodiments, the outer core may be laminated from non-oriented silicon steel sheets. Note that the specific form of the outer core is not limited to this. In other embodiments, the outer core may have other configurations as are commonly used in the art.
In some embodiments, the electromagnetic drive apparatus may further include: a housing 60 disposed radially inward of the fluid flow conduit 30, and an inner core 50 disposed inside the housing 60. In some embodiments, a support 66 is provided radially outward of the housing 60 to support the housing 60 radially inward of the flow conduit 30.
Similar to the structure of the flow conduit 30, the housing 60 may also include a first flow guiding section 61 with a gradually expanding inner diameter, a sleeve section 62 with a uniform inner diameter, and a second flow guiding section 63 with a gradually contracting inner diameter, which are connected in series along the flow direction of the liquid metal. Wherein the first flow guiding section 61, the sleeve section 62 and the second flow guiding section 63 are welded to each other to form a closed chamber inside the casing 60. The inner core 50 is disposed in a closed chamber inside the housing 60.
An annular flow passage for liquid metal is formed between the outer surface of the housing 60 and the inner surface of the flow conduit 30 in communication with the flow inlet and the flow outlet. The annular flow channel jointly constructed by the shell 60 and the liquid flow pipeline 30 is a gradual change annular flow channel with guidance, and the annular flow channel can reduce the flow resistance of the liquid metal as much as possible, improve the flow threshold corresponding to the cavitation vibration phenomenon of the fluid, and greatly improve the fluid stability when the electromagnetic pump 100 of the liquid metal drives the high-temperature liquid metal, particularly the alkali metal such as sodium and potassium.
Referring to fig. 3 to 5, a support 66 may be provided on the radially outer side of the first guide section 61 and the second guide section 63 of the housing 60, respectively, to support the housing 60 coaxially with the flow conduit 30 on the radially inner side of the flow conduit 30. The support 66 forms a through-hole in the circumferential direction of the annular flow passage between the housing 60 and the flow conduit 30 so as not to interfere with the flow of liquid metal in the annular flow passage, but to firmly hold the housing 60 inside the flow conduit 30.
In some embodiments, the electromagnetic drive apparatus may further include: an inner support tube 64 disposed in the closed chamber of the housing 60, and the inner core 50 is tightly fitted over a radial outer side of the inner support tube 64. As will be readily understood by those skilled in the art, the "close fitting" herein means that no relative displacement occurs between the inner core 50 and the inner support tube 64, and the radially inner side surface of the inner core 50 is in close contact with the radially outer side surface of the inner support tube 64, thereby forming good thermal contact between the inner core 50 and the inner support tube 64.
The inner support tube 64 can be connected with the first flow guide section 61 and the second flow guide section 63 in a clearance fit mode, so that the thermal stress generated by temperature difference and material difference can be effectively reduced, the thermal ratchet damage and axial high-temperature buckling of the shell 60 are avoided, and the working stability of the liquid metal electromagnetic pump 100 is improved. Specifically, the width of the gap between the inner support tube 64 and the first flow guide section 61 and the first flow guide section 63 ranges from approximately 0.05mm to 0.2 mm.
With the inner core 50 disposed within the flow conduit 30, it is difficult to effectively dissipate heat from the inner core 50 because it is inside the sealed housing 60, and the housing 60 is inside the high temperature liquid metal. The prior art generally utilizes a means of reducing the temperature of the liquid metal to prevent high temperature demagnetization of the inner core 50. That is, the related art does not consider the improvement of the structure of the inner core 50. The inventors of the present application have found that, in some cases, the internal heat is not efficiently conducted due to the temperature unevenness in the internal portion of the internal core 50, and the problem of local heat accumulation is caused, thereby causing high-temperature demagnetization in the partial structure of the internal core 50.
Therefore, in some embodiments of the present application, especially the housing 60 is internally provided as a vacuum chamber, the inner core 50 is provided in the vacuum chamber, and at least a part of the outer surface of the inner core 50 is closely attached to the radially inner surface of the housing 60. Through setting up like this, can guarantee casing 60 and inside iron core 50 inseparable effective contact under high temperature, improve the conduction efficiency of heat between inside iron core 50 and casing 60, be favorable to reducing inside iron core 50 and take place high temperature and lose magnetism.
In some embodiments, all of the outer surfaces of inner core 50 are in close proximity to the radially inner surface of housing 60. That is, the radially outer surface and the axially outer surface of the inner core 50 are closely attached to the radially inner surface of the housing 60, and the efficiency of heat conduction between the inner core 50 and the housing 60 is further improved.
In some embodiments, the peripheral wall of the housing 60 surrounding the radially outer surface of the inner core 50 is configured to: can be deformed inwards under the effect of the pressure difference between the inner side and the outer side thereof so as to be closely attached to the radial outer surface of the inner core 50, thereby further improving the heat conduction efficiency between the inner core 50 and the shell 60. In such an embodiment, the circumferential wall around the radially outer surface of inner core 50 may be formed by sleeve segments 62. That is, the circumferential wall of the sleeve segment 62 can deform inward under the pressure difference between the inside and the outside thereof, so that the inner surface thereof closely fits the radially outer surface of the inner core 50.
Referring to fig. 5 to 8, the electromagnetic driving apparatus further includes a plurality of annular heat-conducting members 65, and accordingly, a plurality of annular accommodating grooves 51 are axially spaced from the radially outer surface of the inner core 50; each of the annular heat-conducting members 65 is disposed in one of the accommodating grooves 51 to improve heat conduction efficiency between the inner core 50 and the housing 60. Those skilled in the art will readily appreciate that in such embodiments, there is a close fit between the annular heat transfer member 65 and the inner core 50, between the annular heat transfer member 65 and the sleeve segment 62, and between the inner core 50 and the sleeve segment 62.
Liquid metal electromagnetic pump 100's among the prior art inside iron core 50 is formed by the silicon steel sheet pile-up system that extends along the axial usually, inside iron core 50 is relatively poor in the ascending heat transfer effect of circumference, the embodiment of this application further utilizes annular heat-conducting member 65 to strengthen heat-conduction between the different silicon steel sheets and heat-conduction between each silicon steel sheet and the casing 60, be favorable to inside iron core 50 and casing 60 inseparable effective contact under high temperature more, the problem of inside iron core 50 heat accumulation has been solved, greatly reduced the high temperature risk of losing magnetism of inside iron core. Meanwhile, the design of the annular heat conducting member 65 also avoids the radial high-temperature buckling problem of the sleeve section 62 of the shell 60.
In some embodiments, the number of the annular heat-conducting members 65 may be 2, 3, 5, 6, etc., and all of the annular heat-conducting members 65 are disposed at equal intervals on the inner core 50.
In some embodiments, the inner core 50 may be formed by stacking a plurality of silicon steel sheets in a circumferential direction on the radially outer side of the inner support tube 64. Subject to the limitations of the manufacturing process, in some embodiments, the inner core 50 may be comprised of a plurality of segmental cores surrounding the outside of the inner support tube 64. As shown in fig. 7, 8 and 10, the inner core 50 is composed of 6 segmental cores surrounding the outside of the inner support tube 64. Each fan-shaped iron core is formed by tightly laminating a plurality of silicon steel sheets along the circumferential direction.
Note that the specific form of the inner core 50 is not limited to this. In other embodiments, inner core 50 may have other configurations as are commonly used in the art.
Referring to fig. 1-4, in some embodiments, the liquid metal electromagnetic pump 100 may further include: two support assemblies for supporting the fluid flow conduit 30 and the electromagnetic drive means. Each bearing assembly is disposed at one axial end of the fluid flow conduit 30 and the electromagnetic drive.
Each support assembly may include: a support 40 and a flange 80. The support 40 is disposed at one axial side of the liquid flow pipe 30, the support 40 is provided with a support through-hole 41 through which the liquid flow pipe 30 passes, and one axial end of the outer core is thermally connected to one support 40. There is no direct contact between the liquid flow pipe 30 and the support 40, that is, the liquid flow pipe 30 only passes through the through-hole 41 of the support 40, but does not contact the peripheral wall of the through-hole 41, that is, there is a gap between the liquid flow pipe 30 and the through-hole 41, to prevent heat from being directly conducted from the liquid flow pipe 30 to the support 40.
The flange 80 is provided with a through hole for the liquid flow pipe 30 to pass through, and the flange 80 is fixedly connected with the liquid flow pipe 30 and fixedly connected with the support 40 at one side of the support 40 far away from the outer core.
Specifically, the inlet guide section 31 and the outlet guide section 32 of the liquid flow pipe 30 are respectively penetrated to the outer sides of the two supports 40 through the support through hole 41 of one support 40, so that the liquid flow pipe 30 and the electromagnetic driving device are integrally erected between the two supports 40. The inlet guide section 31 and the outlet guide section 32 of the flow conduit 30 may be respectively tightly fitted with a flange 80, and the flange 80 is fixedly connected with the support 40 by a fastening member 43. Referring to fig. 3, two ends of the external core are respectively provided with a mounting member 23, the mounting member 23 is provided with a mounting hole, and the two ends of the external core are correspondingly mounted on the two supports 40 by a first fastening member 42. Thus, the two support assemblies, the fluid flow conduit 30 and the electromagnetic drive device are assembled together as a unitary structure.
In some embodiments, referring to fig. 4, a thermal spacer 90 is also provided between flange 80 and support 40 to reduce heat transfer therebetween.
Referring to fig. 11 and 12, in some embodiments, a side surface of the flange 80 facing the support 40 is formed with a protrusion 82 protruding toward the support 40, and the flange 80 is in contact with the support 40 through the protrusion 82; accordingly, the contact area between the flange 80 and the support 40 can be reduced as much as possible, and heat transfer from the flange 80 to the support 40 can be reduced as much as possible, so that heat can be prevented from being transferred to the outer core via the support 40.
In some embodiments, the boss 82 is an annular flange formed at the periphery of the flange 80. In other embodiments, the protrusions 82 are a plurality of protrusions formed on the flange 80 at circumferentially spaced intervals.
In some embodiments, the contact surface of the protrusion 82 and the support 40 is provided with a plurality of ribs 83, and the flange 80 is in contact with the support 40 through the ribs 83, thereby further reducing the contact area of the flange 80 and the support 40. The ribs 83 may extend in the circumferential direction, and a V-shaped groove may be formed between two adjacent ribs 83.
In some embodiments, the circumferential edge of the flange 80 is provided with a plurality of flange slots 81 to weaken the thermal stress caused by the radial thermal gradient. Each support assembly may further comprise: a plurality of fasteners 43, each fastener 43 passing through one of the flange slots 81 fixedly connects the flange 80 to the support 40. This application embodiment carries out special design through flange 80 to supporting component for flange 80 possesses excellent thermal adaptability and thermal-insulated ability, both can be directly closely cooperate and do not produce big thermal stress with high temperature liquid flow pipeline 30, thereby guarantee to the firm support of liquid flow pipeline 30, can effectively alleviate the heat-conduction of high temperature liquid metal to outside iron core and coil 10 again.
In summary, the embodiment of the present application is beneficial to reducing the occurrence of high-temperature magnetic loss in the internal core 50 by improving the heat conduction between the shell 60 and the internal core 50; through arranging the heat dissipation holes 22 on the strip-shaped iron core 20 and specially designing the size of the iron core slot 21, the air circulation around the coil 10 is enhanced, and the high-temperature magnetic loss of an external iron core is avoided; by specially designing the flange 80 of the support assembly, the heat conduction of the high temperature liquid metal to the outer core and coil can be effectively reduced. According to the embodiment of the application, the failure rate of the liquid metal electromagnetic pump 100 can be obviously reduced through the scheme, and the long-term stable operation of the electromagnetic driving device in high-temperature liquid metal is guaranteed. Therefore, the liquid metal electromagnetic pump 100 of the present invention is particularly suitable for special application scenarios (such as severe environments of nuclear power plants) with both high medium temperature and high reliability requirements.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (15)
1. A liquid metal electromagnetic pump, comprising:
a flow conduit (30) having a flow inlet for receiving an inflow of liquid metal and a flow outlet for conveying the liquid metal outwardly; and
an electromagnetic drive device for providing an electromagnetic force for driving the liquid metal to flow from the fluid inlet to the fluid outlet, the electromagnetic drive device comprising:
a housing (60) disposed radially inwardly of the flow conduit (30), the housing (60) defining a vacuum chamber therein, an annular flow passage for liquid metal communicating with the liquid inlet and the liquid outlet being defined between an outer surface of the housing (60) and an inner surface of the flow conduit (30); and
an inner core (50) disposed in the vacuum chamber, wherein at least a portion of an outer surface of the inner core (50) is in close contact with a radially inner surface of the housing (60).
2. A liquid metal electromagnetic pump according to claim 1, wherein all outer surfaces of the inner core (50) are in close abutment with radially inner surfaces of the housing (60).
3. A liquid metal electromagnetic pump according to claim 1, wherein a peripheral wall of the housing (60) surrounding a radially outer surface of the inner core (50) is configured to: the inner core (50) and the outer core (60) can deform inwards under the action of pressure difference between the inner side and the outer side so as to be tightly attached to the radial outer surface of the inner core (50), and therefore the heat conduction efficiency between the inner core (50) and the shell (60) is improved.
4. A liquid metal electromagnetic pump according to claim 3, wherein the casing (60) comprises a first diverging inner diameter flow guide section (61), a uniform inner diameter casing section (62) and a second diverging inner diameter flow guide section (63) which are connected in series in the liquid metal flow direction;
wherein the sleeve segment (62) forms a circumferential wall around a radially outer surface of the inner core (50).
5. A liquid metal electromagnetic pump as claimed in claim 4, wherein the electromagnetic drive further comprises: an inner support tube (64) which is arranged in the vacuum chamber and is connected to the first flow guide section (61) and the second flow guide section (63) in a clearance fit manner, wherein
The inner iron core (50) is tightly sleeved on the radial outer side of the inner support pipe (64).
6. A liquid metal electromagnetic pump according to claim 1, wherein the radially outer surface of the inner core (50) is provided with a plurality of annular receiving grooves (51) at axially spaced intervals,
the electromagnetic driving device further comprises a plurality of annular heat-conducting members (65), wherein each annular heat-conducting member (65) is arranged in one accommodating groove (51) so as to improve the heat conduction efficiency between the inner iron core (50) and the shell (60).
7. A liquid metal electromagnetic pump as claimed in claim 1, wherein said electromagnetic drive further comprises:
an outer core extending in an axial direction of the liquid flow pipe (30) at a radially outer side thereof, the outer core being provided with a plurality of winding slots along a length direction thereof; and
a plurality of coils (10) sleeved on the radial outer side of the liquid flow pipeline (30), wherein each coil (10) is arranged in one winding groove of the outer iron core.
8. A liquid metal electromagnetic pump according to claim 7, wherein the outer core includes a plurality of bar cores (20) extending in the axial direction, and arranged at equal intervals in the circumferential direction thereof radially outside the liquid flow pipe (30), each of the bar cores (20) being provided with a plurality of core slots (21) in the axial direction, the core slots (21) of the plurality of bar cores (20) at the same position in the axial direction collectively constituting one of the winding slots; wherein
A heat dissipation hole (22) is arranged between two adjacent iron core slots (21).
9. A liquid metal electromagnetic pump according to claim 7, wherein a thermal barrier layer (70) is also provided between the outer core and the flow conduit (30).
10. The liquid metal electromagnetic pump of claim 7, further comprising: two support assemblies for supporting said fluid flow conduit (30) and said electromagnetic drive means, each said support assembly being disposed at an axial end of said fluid flow conduit (30) and said electromagnetic drive means, each said support assembly comprising:
the support (40) is arranged on one axial side of the liquid flow pipeline (30), a support through hole (41) for the liquid flow pipeline (30) to pass through is formed in the support (40), and one axial end of the external iron core is thermally connected with the support (40); and
the flange (80) is provided with a through hole for the liquid flow pipeline (30) to pass through, the flange (80) is fixedly connected with the liquid flow pipeline (30), and one side of the support (40) far away from the external iron core is fixedly connected with the support (40).
11. Liquid metal electromagnetic pump according to claim 10, characterized in that the flange (80) is formed with a projection (82) projecting towards the seat (40) on the side surface facing the seat (40), the flange (80) being in contact with the seat (40) through the projection (82).
12. A liquid metal electromagnetic pump according to claim 11, wherein the boss (82) is an annular flange formed on the periphery of the flange (80).
13. A liquid metal electromagnetic pump according to claim 11, characterized in that the contact surface of the boss (82) with the seat (40) is provided with a plurality of ribs (83).
14. A liquid metal electromagnetic pump according to claim 10, wherein the circumferential edge of the flange (80) is provided with a plurality of flange slots (81);
each of the support assemblies further comprises: a plurality of fasteners (43), each fastener (43) passing through one of the flange slots (81) to fixedly connect the flange (80) to the support (40).
15. A liquid metal electromagnetic pump as claimed in claim 1, wherein said electromagnetic drive further comprises:
a support (66) disposed radially outwardly of the housing (60) to support the housing (60) radially inwardly of the flow conduit (30).
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| CN202110127637.7A CN112803712B (en) | 2021-01-29 | 2021-01-29 | Liquid metal electromagnetic pump |
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| CN202110127637.7A CN112803712B (en) | 2021-01-29 | 2021-01-29 | Liquid metal electromagnetic pump |
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| CN112803712B CN112803712B (en) | 2022-07-01 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315338A (en) * | 2021-07-05 | 2021-08-27 | 中国科学院近代物理研究所 | Liquid metal electromagnetic pump |
| CN114531007A (en) * | 2022-03-03 | 2022-05-24 | 上海交通大学 | Electromagnetic pump for molten metal |
| CN114570919A (en) * | 2022-03-03 | 2022-06-03 | 上海交通大学 | Electromagnetic conveying device and method for metal melt |
| CN114640236A (en) * | 2022-05-09 | 2022-06-17 | 浙江大学 | Electromagnetic pump |
| CN114665686A (en) * | 2022-04-11 | 2022-06-24 | 中国原子能科学研究院 | Spiral electromagnetic pump |
| CN115001236A (en) * | 2022-03-31 | 2022-09-02 | 中国原子能科学研究院 | Liquid metal electromagnetic pump |
| CN117040231A (en) * | 2023-10-10 | 2023-11-10 | 惠州市艾美珈磁电技术股份有限公司 | Electromagnetic pump with steady flow guide plate structure |
| CN118017795A (en) * | 2024-04-08 | 2024-05-10 | 浙江大学 | Induction electromagnetic pump |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3045599A (en) * | 1959-06-08 | 1962-07-24 | Honeywell Regulator Co | Electromagnetic conductive fluid pump |
| US4557667A (en) * | 1983-12-01 | 1985-12-10 | Electricite De France | Electromagnetic pump |
| FR2605468A1 (en) * | 1986-10-17 | 1988-04-22 | Commissariat Energie Atomique | ELECTROMAGNETIC INDUCTION PUMP |
| US4775298A (en) * | 1985-08-08 | 1988-10-04 | Interatom Gmbh | Electromagnetic screw channel pump for liquid metals with internally disposed polyphase coils |
| US20020190444A1 (en) * | 2000-01-15 | 2002-12-19 | Kagan Valery G. | Methods employing permanent magnets having reach-out magnetic fields for electromagnetically pumping, braking, and metering molten metals feeding into metal casting machines |
| JP2006352992A (en) * | 2005-06-15 | 2006-12-28 | Central Res Inst Of Electric Power Ind | Electromagnetic flow coupler and its designing method |
| CN101656460A (en) * | 2009-09-30 | 2010-02-24 | 石家庄爱迪尔电气有限公司 | Inside and outside core AC induction pump for transmitting liquid metal |
| CN105949830A (en) * | 2016-06-20 | 2016-09-21 | 江阴市创佳电器有限公司 | Silicon steel sheet for rotor of wind driven generator |
| CN105978290A (en) * | 2016-06-23 | 2016-09-28 | 北京原丰科技开发总公司 | Lightweight core electromagnetic pump |
| CN106451996A (en) * | 2016-10-25 | 2017-02-22 | 中国原子能科学研究院 | Liquid-state metal electromagnetic pump for space nuclear environment |
| CN106961206A (en) * | 2017-03-21 | 2017-07-18 | 江苏大学镇江流体工程装备技术研究院 | A kind of column type linear response electromagnetic pump for setting up current stabilization guide plate |
| CN107231079A (en) * | 2017-05-24 | 2017-10-03 | 江苏大学 | A kind of multistage ALIP electromagnetic pumps with steady flow segment |
| CN109154070A (en) * | 2016-05-03 | 2019-01-04 | 塔塔钢铁荷兰科技有限责任公司 | Method for controlling the temperature of electromagnetic pump |
-
2021
- 2021-01-29 CN CN202110127637.7A patent/CN112803712B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3045599A (en) * | 1959-06-08 | 1962-07-24 | Honeywell Regulator Co | Electromagnetic conductive fluid pump |
| US4557667A (en) * | 1983-12-01 | 1985-12-10 | Electricite De France | Electromagnetic pump |
| US4775298A (en) * | 1985-08-08 | 1988-10-04 | Interatom Gmbh | Electromagnetic screw channel pump for liquid metals with internally disposed polyphase coils |
| FR2605468A1 (en) * | 1986-10-17 | 1988-04-22 | Commissariat Energie Atomique | ELECTROMAGNETIC INDUCTION PUMP |
| US20020190444A1 (en) * | 2000-01-15 | 2002-12-19 | Kagan Valery G. | Methods employing permanent magnets having reach-out magnetic fields for electromagnetically pumping, braking, and metering molten metals feeding into metal casting machines |
| JP2006352992A (en) * | 2005-06-15 | 2006-12-28 | Central Res Inst Of Electric Power Ind | Electromagnetic flow coupler and its designing method |
| CN101656460A (en) * | 2009-09-30 | 2010-02-24 | 石家庄爱迪尔电气有限公司 | Inside and outside core AC induction pump for transmitting liquid metal |
| CN109154070A (en) * | 2016-05-03 | 2019-01-04 | 塔塔钢铁荷兰科技有限责任公司 | Method for controlling the temperature of electromagnetic pump |
| CN105949830A (en) * | 2016-06-20 | 2016-09-21 | 江阴市创佳电器有限公司 | Silicon steel sheet for rotor of wind driven generator |
| CN105978290A (en) * | 2016-06-23 | 2016-09-28 | 北京原丰科技开发总公司 | Lightweight core electromagnetic pump |
| CN106451996A (en) * | 2016-10-25 | 2017-02-22 | 中国原子能科学研究院 | Liquid-state metal electromagnetic pump for space nuclear environment |
| CN106961206A (en) * | 2017-03-21 | 2017-07-18 | 江苏大学镇江流体工程装备技术研究院 | A kind of column type linear response electromagnetic pump for setting up current stabilization guide plate |
| CN107231079A (en) * | 2017-05-24 | 2017-10-03 | 江苏大学 | A kind of multistage ALIP electromagnetic pumps with steady flow segment |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315338A (en) * | 2021-07-05 | 2021-08-27 | 中国科学院近代物理研究所 | Liquid metal electromagnetic pump |
| CN114531007A (en) * | 2022-03-03 | 2022-05-24 | 上海交通大学 | Electromagnetic pump for molten metal |
| CN114570919A (en) * | 2022-03-03 | 2022-06-03 | 上海交通大学 | Electromagnetic conveying device and method for metal melt |
| CN114570919B (en) * | 2022-03-03 | 2022-11-29 | 上海交通大学 | Electromagnetic conveying device and method for metal melt |
| CN114531007B (en) * | 2022-03-03 | 2023-09-22 | 上海交通大学 | Electromagnetic pump for molten metal |
| CN115001236B (en) * | 2022-03-31 | 2024-09-06 | 中国原子能科学研究院 | Liquid metal electromagnetic pump |
| CN115001236A (en) * | 2022-03-31 | 2022-09-02 | 中国原子能科学研究院 | Liquid metal electromagnetic pump |
| CN114665686A (en) * | 2022-04-11 | 2022-06-24 | 中国原子能科学研究院 | Spiral electromagnetic pump |
| CN114665686B (en) * | 2022-04-11 | 2023-08-18 | 中国原子能科学研究院 | Spiral electromagnetic pump |
| CN114640236A (en) * | 2022-05-09 | 2022-06-17 | 浙江大学 | Electromagnetic pump |
| CN117040231B (en) * | 2023-10-10 | 2023-12-12 | 惠州市艾美珈磁电技术股份有限公司 | Electromagnetic pump with steady flow guide plate structure |
| CN117040231A (en) * | 2023-10-10 | 2023-11-10 | 惠州市艾美珈磁电技术股份有限公司 | Electromagnetic pump with steady flow guide plate structure |
| CN118017795A (en) * | 2024-04-08 | 2024-05-10 | 浙江大学 | Induction electromagnetic pump |
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