CN112311195B - Cylindrical linear induction electromagnetic pump with axial guide vanes - Google Patents
Cylindrical linear induction electromagnetic pump with axial guide vanes Download PDFInfo
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- CN112311195B CN112311195B CN202010993274.0A CN202010993274A CN112311195B CN 112311195 B CN112311195 B CN 112311195B CN 202010993274 A CN202010993274 A CN 202010993274A CN 112311195 B CN112311195 B CN 112311195B
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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
Abstract
The invention provides a cylindrical linear induction electromagnetic pump with axial guide vanes, wherein m axial guide vanes are uniformly arranged in the circumferential direction in a flow channel of the electromagnetic pump, the size of m is the same as the number of external stators, and the length of each guide vane is determined by the number of the external stators, the central radius of the flow channel, the Reynolds number of a magnetic field and the wave number of a traveling wave magnetic field. The axial guide vane can remarkably reduce the influence of circumferential uneven disturbance of a magnetic field and a flow field on the stability of the flow field, thereby playing a role in stabilizing the flow and greatly improving the flow stability of the large-flow pump under the operation of an eccentric working condition.
Description
Technical Field
The invention relates to the technical field of electromagnetic pumps, in particular to a cylindrical linear induction electromagnetic pump with axial guide vanes.
Background
The cylindrical Linear Induction electromagnetic Pump (ALIP) is an ideal Pump type for driving pumps by an accelerator driving subcritical system (ADS), a fourth generation liquid metal cooling fast neutron reactor main cooling loop and a secondary loop, a coil winding of the cylindrical Linear Induction electromagnetic Pump is externally connected with three-phase alternating current, the alternating current can be excited to generate a travelling magnetic field, the travelling magnetic field can further enable liquid metal to generate Induction current, and the interaction of the Induction current and the travelling magnetic field can generate Lorentz force along the axial direction of a Pump body so as to push fluid to flow along the axial direction of the Pump. The ALIP electromagnetic pump realizes the directional movement of liquid metal under the condition of complete closure, the driving mode has a simple structure, no mechanical movement and no leakage, can stably operate for a long time, and has the advantages which cannot be compared with the traditional mechanical pump; the high-efficiency area of the pump is narrow, and when the flow rate slightly deviates from the design point, the efficiency of the pump is obviously reduced. Therefore, designing a novel structure capable of improving the flow stability is a key technology for enlarging the ALIP electromagnetic pump.
The domestic utility model CN200920217356 'liquid metal transmission is with inside and outside cored AC induction pump', reduces the magnetic leakage quantity by adding iron core inside and outside the runner, lightens the distribution irregularity of Lorentz force in the radial direction of the runner, reduces the probability of the meridian plane of the runner having reverse flow, thereby improving the efficiency; the invention patent CN201911262539.3 'a self-current-stabilizing cylindrical linear induction electromagnetic pump' designs an external stator with multiple sections distributed in a staggered way, which greatly reduces the distribution unevenness of an induction magnetic field in the circumferential direction and further reduces the influence of non-axial Lorentz force on flow stability. The invention patent CN201710167971 discloses a cylindrical linear induction electromagnetic pump additionally provided with a flow stabilizing guide plate, wherein unstable flow is suppressed by arranging the flow stabilizing guide plate in the axial direction of a flow channel. The steady flow guide plate can effectively block and destroy the formation and development of vortex in the flow passage, and greatly improves the flowing stability of molten metal in the pump. The invention discloses a multi-stage ALIP electromagnetic pump with a steady flow section, and a patent CN201710371575, wherein the multi-stage ALIP electromagnetic pump with the steady flow section divides the whole pump body into multi-stage pump sections, each stage of pump section consists of a first-stage electromagnetic section and a first-stage steady flow section, the electromagnetic section is responsible for applying work to the metal liquid to increase the pressure, the steady flow section is responsible for stabilizing the unstable flow of the metal liquid, two winding coil wiring modes of single-side wiring and double-side wiring are provided, and the radial uniformity of Lorentz force in a flow channel is improved; above patent all has proposed some improvement and innovative measures to the electromagnetic pump, but utility model patent the electromagnetic pump is mainly applied to the low discharge operating mode, does not mention the unstable suppression method of flow in the large-flow pump, and outside stator segmentation design makes the pump body structure complicated, and manufacturing is comparatively difficult to current stationary flow baffle design does not give its size and arranges regional accurate calculation method.
The invention aims at large ALIP design, improves the flow stability in the pump and enlarges the high-efficiency area of the pump by arranging the axial guide vanes and redesigning the flow channel structure, provides an accurate scheme for arranging the axial guide vanes and provides possibility for designing and manufacturing a large-flow ALIP electromagnetic pump.
Disclosure of Invention
In order to solve the technical problems of unstable internal flow and narrow high-efficiency area of a large ALIP electromagnetic pump, the invention discloses a cylindrical linear induction electromagnetic pump with axial guide vanes, which comprises the axial guide vanes, a flow passage outer pipe, a flow passage inner pipe, an inner stator, an outer stator, a coil winding and a positioning chuck;
the runner inner pipe and the runner outer pipe are coaxially arranged, a runner for containing liquid metal is formed between the runner inner pipe and the runner outer pipe, the inner stator is positioned inside the runner inner pipe, the outer stator is positioned outside the runner outer pipe, the outer stator is fixed by the positioning chuck, the positioning chuck is fixedly connected on the runner outer pipe, the coil winding is filled in the tooth groove of the outer stator, and the axial guide vanes are uniformly arranged in the runner in the circumferential direction;
preferably, the axial guide vane is arranged at P<0, and P is the Reynolds number R of the magnetic fieldmThe wave number K of the traveling wave magnetic field and the wave number K of the inlet are K1+iK2The center radius R of the flow channel, the number m of the external stators, the frequency f of the input current and the average speed U of the fluid. P is the rate of change of the magnitude of the flow field disturbance with respect to time, K1And K2The imaginary part and the real part of the inlet wave number respectively;
preferably, the value of P determining the axial guide vane position and the axial dimension is:
wherein mu and sigma are respectively the magnetic conductivity and the electric conductivity of the liquid metal, and z is an axial coordinate.
Optionally, the number m of axial vanes is equal to the number of outer stators, m being equal to or greater than 6 and equal to or less than 10.
Preferably, the circumferential position of the axial vane is located in the middle of the two outer stators.
Optionally, the thickness of the axial guide vane is 1/6-1/5 of the flow passage width, and the axial length is determined by the P value.
Optionally, the winding of the coil winding is circumferentially wound in a slot of the external stator, and a Y-type winding manner is adopted, and the number of pole pairs is greater than or equal to 3 and less than or equal to 5.
Optionally, the axial guide vane, the outer runner pipe, the inner runner pipe and the positioning chuck are all made of demagnetized stainless steel materials.
Optionally, a layer of insulation material is laid between the outer runner pipe and the outer stator.
Optionally, the inner stator and the outer stator are formed by laminating multiple layers of silicon steel sheets.
By adopting the technical scheme, the cylindrical linear induction electromagnetic pump with the axial guide vanes has the following beneficial effects:
the axial guide vanes with the same number as the external stators are uniformly arranged in the flow channel of the electromagnetic pump according to the positive and negative values of the P value, the arranged axial guide vanes can obviously reduce the influence of circumferential uneven disturbance of a magnetic field and axial speed on the flow stability, further reduce the disturbance of factors such as non-axial Lorentz force and the like on the fluid, and further inhibit the unstable flow of the liquid metal in the flow channel. The invention can effectively solve the problem of unstable flow of the cylindrical linear induction electromagnetic pump on the premise of meeting the requirements of service life and reliability, and has the characteristics of simple structure, stable work and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1(a) is an isometric view of a cylindrical linear induction electromagnetic pump with axial vanes;
FIG. 1(b) is a cross-sectional view of FIG. 1 (a);
FIG. 1(c) is a cross-sectional view of FIG. 1 (a);
fig. 2(a), (b), (c) show three arrangements of axial guide vanes.
The following is a supplementary description of the drawings:
1-axial guide vane, 2-runner outer pipe, 3-runner inner pipe, 4-internal stator, 5-external stator, 6-coil winding, 7-positioning chuck.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
in order to solve the technical problems of unstable internal flow and narrow high-efficiency area of a large ALIP electromagnetic pump, the embodiment provides a cylindrical linear induction electromagnetic pump with axial guide vanes, which is explained by combining with the attached drawings 1-2.
A cylindrical linear induction electromagnetic pump with axial guide vanes comprises axial guide vanes (1), a flow channel outer pipe (2), a flow channel inner pipe (3), an inner stator (4), an outer stator (5), a coil winding (6) and a positioning chuck (7);
the flow channel inner pipe (3) and the flow channel outer pipe (2) are coaxially arranged, a flow channel for containing liquid metal is formed between the flow channel inner pipe (3) and the flow channel outer pipe (2), the inner stator (4) is positioned inside the flow channel inner pipe (3), the outer stator (5) is positioned outside the flow channel outer pipe (2), the outer stator (5) is fixed by the positioning chuck (7), the positioning chuck (7) is fixedly connected to the flow channel outer pipe (2), the coil winding (6) is filled in a tooth groove of the outer stator (5), and the axial guide vanes (1) are circumferentially and uniformly arranged in the flow channel;
in this embodiment, the axial guide vanes (1) are uniformly arranged in the flow channel in the circumferential direction according to the positive and negative values of the P value, and the arranged axial guide vanes can significantly reduce the influence of circumferential non-uniform disturbance of the magnetic field on the axial speed on the flow stability, and further reduce the disturbance of factors such as non-axial lorentz force on the fluid, so as to suppress unstable flow of the liquid metal in the flow channel, where the P value is:
wherein mu and sigma are respectively the magnetic conductivity and the electric conductivity of the liquid metal, and z is an axial coordinate. P is the Reynolds number of the magnetic field RmThe wave number K of the traveling wave magnetic field and the wave number K of the inlet are K1+iK2The center radius R of the flow channel, the number m of the external stators, the frequency f of the input current and the average speed U of the fluid.
With reference to fig. 2(a), (b), and (c), according to the positive and negative characteristics of the P value, the axial guide vane (1) has 3 arrangement modes in the flow channel, which are respectively arranged in the entire electromagnetic section and the outlet section, in the rear and outlet sections of the electromagnetic section, and in the front of the electromagnetic section.
In some examples, the number m of axial vanes (1) is equal to the number of outer stators (5), m being greater than or equal to 6 and less than or equal to 10.
In some examples, the circumferential position of the axial vane (1) is located in the middle of two outer stators (5).
In some examples, the thickness of the axial guide vane (1) is 1/6-1/5 of the flow channel width, and the axial length is determined by the P value.
In some examples, the winding of the coil winding (6) is wound in a slot of an external stator (5) in a circumferential direction, and a Y-shaped winding mode is adopted, and the number of pole pairs is greater than or equal to 3 and less than or equal to 5.
In some examples, the axial guide vane (1) and the outer runner pipe (2), the inner runner pipe (3) and the positioning chuck (7) are all made of demagnetized stainless steel materials.
In some examples, a layer of insulation material is laid between the outer runner pipe (2) and the outer stator (5).
In some examples, the inner stator (4) and the outer stator (5) are formed by laminating multiple layers of silicon steel sheets.
The external stator (5) is formed by overlapping multiple layers of silicon steel sheets, and is provided with a fan-shaped section in order to take the distribution uniformity of a magnetic field and the heat dissipation performance of the pump into consideration.
The applicant finds that the large-flow ALIP electromagnetic pump is easy to generate unstable flow under the working condition of small flow through a large amount of research, and the main reason for generating the unstable flow is related to the structure of the external stator. The traditional ALIP electromagnetic pump is characterized in that an external stator is designed into a split stator which is uniformly distributed along the circumferential direction in order to solve the problem of heat dissipation of a pump body, the split external stator causes electromagnetic fields generated by three-phase alternating currents to be unevenly distributed in the circumferential direction, then the Lorentz force borne by liquid metal is unevenly distributed in the circumferential direction, finally the distribution of flow velocity is uneven, the flow velocity of fluid in a flow channel corresponding to an external stator core is larger than the velocity of fluid in the flow channel corresponding to a gap, and the unevenness of the Lorentz force and the velocity causes unstable flow along with the accumulation of time. On the premise of not changing the existing external stator structure, the axial guide vanes are arranged in the flow channel, the arrangement region of the axial guide vanes is determined by the positive and negative values of the P value, the P value is the change rate of the magnetic field and flow field disturbance in the flow channel along with time, if the P value is a negative value, the disturbance is increased along with the time evolution, if the P value is a positive value, the disturbance is decreased along with the time evolution until the disturbance disappears, and therefore the axial guide vanes are arranged in the region with the negative P value. And the P value is:
the number of the axial guide vanes is m, and the more the number of the axial guide vanes, the more the P value is possible to be positive, so that the arrangement of the axial guide vanes in the flow channel can suppress the disturbance of a flow field and a magnetic field in the flow channel as much as possible, the influence of the circumferential uneven disturbance of the magnetic field on the axial speed on the flow stability can be obviously reduced, the disturbance of factors such as non-axial Lorentz force and the like on the fluid is further reduced, and the unstable flow of the liquid metal in the flow channel is restrained.
In summary, in the cylindrical linear induction electromagnetic pump with axial guide vanes, m pieces of axial guide vanes are uniformly arranged in the circumferential direction in a flow channel of the electromagnetic pump, the size of m is the same as the number of external stators, and the lengths of the guide vanes are determined by the number of the external stators, the central radius of the flow channel, the reynolds number of a magnetic field and the wave number of a traveling wave magnetic field. The axial guide vane can remarkably reduce the influence of circumferential uneven disturbance of a magnetic field and a flow field on the stability of the flow field, thereby playing a role in stabilizing the flow and greatly improving the flow stability of the large-flow pump under the operation of an eccentric working condition.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The utility model provides a cylinder formula linear induction electromagnetic pump with axial stator which characterized in that: the device comprises an axial guide vane (1), a flow channel outer tube (2), a flow channel inner tube (3), an inner stator (4), an outer stator (5), a coil winding (6) and a positioning chuck (7); the axial guide vane (1) is connected between the outer runner pipe (2) and the inner runner pipe (3), the outer runner pipe (2) and the inner runner pipe (3) are coaxially arranged, the inner stator (4) is filled in the inner runner pipe (3), the outer stator (5) is arranged outside the outer runner pipe (2) through a positioning chuck (7), the positioning chuck (7) is fixedly connected to the outer runner pipe (2), and the coil winding (6) is filled in a wire slot of the outer stator (5);
the axial guide vane (1) is arranged at P<Region of 0, P is the rate of change of the magnitude of the flow field disturbance with respect to time, and P is the Reynolds number R of the magnetic fieldmThe wave number K of the traveling wave magnetic field and the wave number K of the inlet are K1+iK2The radius of the center of the flow channel R, the number m of the outer stators (5), the frequency f of the input current, and the average speed U of the fluid, K1And K2The imaginary part and the real part of the inlet wave number respectively, and the P value determining the position and the axial size of the axial guide vane (1) is as follows:
wherein mu and sigma are respectively the magnetic conductivity and the electric conductivity of the liquid metal, and z is an axial coordinate.
2. The cylindrical linear induction electromagnetic pump with axial guide vanes of claim 1, wherein: the number m of the axial guide vanes (1) is equal to the number of the outer stators (5), m is greater than or equal to 6 and less than or equal to 10, the circumferential position of each axial guide vane (1) is located between the two outer stators (5), the thickness of each axial guide vane (1) is 1/6-1/5 of the width of a flow channel, and the axial length is determined by the value P.
3. The cylindrical linear induction electromagnetic pump with axial guide vanes of claim 1, wherein: the winding circumference of coil winding (6) twines in the wire casing of outside stator (5), and adopts Y type wire winding mode, and the number of pole pairs is more than or equal to 3, and is less than or equal to 5.
4. The cylindrical linear induction electromagnetic pump with axial guide vanes according to any one of claims 1-3, characterized in that: the axial guide vane (1), the flow channel outer pipe (2), the flow channel inner pipe (3) and the positioning chuck (7) are all made of demagnetized stainless steel materials.
5. The cylindrical linear induction electromagnetic pump with axial guide vanes according to any one of claims 1-3, characterized in that: and a layer of heat insulating material is paved between the runner outer pipe (2) and the outer stator (5).
6. The cylindrical linear induction electromagnetic pump with axial guide vanes according to any one of claims 1-3, characterized in that: the inner stator (4) and the outer stator (5) are formed by laminating multiple layers of silicon steel sheets.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010993274.0A CN112311195B (en) | 2020-09-21 | 2020-09-21 | Cylindrical linear induction electromagnetic pump with axial guide vanes |
| PCT/CN2021/070588 WO2022057167A1 (en) | 2020-09-21 | 2021-01-07 | Annular linear induction pump having axial guide vanes |
| GB2218343.8A GB2610529B (en) | 2020-09-21 | 2021-01-07 | Annular linear induction electromagnetic pump having axial guide vanes |
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| CN202010993274.0A CN112311195B (en) | 2020-09-21 | 2020-09-21 | Cylindrical linear induction electromagnetic pump with axial guide vanes |
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| CN112311195B true CN112311195B (en) | 2021-11-23 |
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| CN102177257A (en) * | 2008-08-07 | 2011-09-07 | Tmt出铁测量技术有限公司 | Method and devices for regulating the flow rate and for slowing down non-ferromagnetic, electrically-conducting liquids and melts |
| CN106655703A (en) * | 2016-12-23 | 2017-05-10 | 上海大学 | Conductive liquid micro driving device and applications thereof |
| CN107231079A (en) * | 2017-05-24 | 2017-10-03 | 江苏大学 | A kind of multistage ALIP electromagnetic pumps with steady flow segment |
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| SU1223817A1 (en) * | 1984-03-11 | 1991-08-15 | Предприятие П/Я А-7904 | Cylindrical linear induction pump |
| CN100468928C (en) * | 2003-04-21 | 2009-03-11 | 应达公司 | Electromagnetic pump |
| JP2006352992A (en) * | 2005-06-15 | 2006-12-28 | Central Res Inst Of Electric Power Ind | Electromagnetic flow coupler and its designing method |
| CN101382153B (en) * | 2008-04-10 | 2011-06-15 | 李宸 | Air-cooled type aluminium pad permanent magnet pump |
| JP2015065778A (en) * | 2013-09-26 | 2015-04-09 | 株式会社東芝 | Solenoid pump and manufacturing method therefor |
| US9948171B1 (en) * | 2013-11-18 | 2018-04-17 | Laurence R. Salamey | Positive displacement inductive pump |
| CN203875442U (en) * | 2014-02-28 | 2014-10-15 | 晋宝电气（浙江）有限公司 | Intelligent wave solder |
| CN105591521B (en) * | 2016-03-10 | 2019-02-26 | 紫光日东科技（深圳）有限公司 | It is a kind of for conveying the electromagnetic pump of liquid non-ferrous metal |
| CN106961206B (en) * | 2017-03-21 | 2019-06-28 | 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 adding current stabilization guide plate |
| CN110994939B (en) * | 2019-12-11 | 2021-11-30 | 江苏大学镇江流体工程装备技术研究院 | Self-stabilized cylindrical linear induction electromagnetic pump |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102177257A (en) * | 2008-08-07 | 2011-09-07 | Tmt出铁测量技术有限公司 | Method and devices for regulating the flow rate and for slowing down non-ferromagnetic, electrically-conducting liquids and melts |
| CN106655703A (en) * | 2016-12-23 | 2017-05-10 | 上海大学 | Conductive liquid micro driving device and applications thereof |
| CN107231079A (en) * | 2017-05-24 | 2017-10-03 | 江苏大学 | A kind of multistage ALIP electromagnetic pumps with steady flow segment |
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| WO2022057167A1 (en) | 2022-03-24 |
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