CN110994939A - Self-stabilized cylindrical linear induction electromagnetic pump - Google Patents
Self-stabilized cylindrical linear induction electromagnetic pump Download PDFInfo
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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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Abstract
The invention provides a self-stabilized flow cylindrical linear induction electromagnetic pump, wherein an external stator of the electromagnetic pump comprises at least two sections, each section of the external stator is a split stator, and two adjacent sections of the external stators are uniformly and alternately arranged along the circumferential direction and assembled into an integral external stator with an unstable flow suppressing effect through a positioning chuck. The integral external stator can remarkably reduce the influence of circumferential distribution nonuniformity of the axial speed of the liquid metal on the stability of a flow field, thereby reducing the disturbance of factors such as non-axial Lorentz force and the like on fluid, playing a role in stabilizing the flow and greatly improving the flow stability of the large-flow pump under the working condition of small flow.
Description
Technical Field
The invention relates to the technical field of electromagnetic pumps, in particular to a self-stabilized cylindrical linear induction electromagnetic pump.
Background
The cylindrical Linear Induction electromagnetic Pump (ALIP) is an ideal Pump type for driving pumps of a main cooling loop and a secondary loop of a fourth generation liquid metal cooling fast neutron reactor, and generates Lorentz force along the axial direction of a Pump body to push fluid to flow along the axial direction of the Pump by utilizing the interaction of a traveling wave magnetic field induced by an external three-phase alternating current and induced current in conductive fluid. The ALIP electromagnetic pump realizes the directional movement of liquid metal under the completely closed condition, and the driving mode has the advantages of simple structure, no mechanical movement, no leakage and long-term stable operation. Experimental results show that the flow instability phenomenon can occur when the large-flow ALIP electromagnetic pump operates under the working condition of small flow, the outlet pressure pulsation is increased to cause flow oscillation and pump body vibration, the internal flow field is disordered and large-scale vortex and reverse flow occur; 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 CN02254740 "self-excited electromagnetic pump" unites the conveying appliance and power source into an organic whole and forms the self-excited electromagnetic pump of the conveying pipeline, it has changed the working principle of the ordinary pump from the essence, has simplified the structure; in the utility model CN200920217356, "ac induction pump with inner and outer cores for liquid metal transmission", the magnetic flux leakage is reduced by adding iron cores inside and outside the flow channel, the uneven distribution of lorentz force in the radial direction of the flow channel is reduced, and the probability of reverse flow on the meridian plane of the flow channel is reduced, thereby improving the efficiency; 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; 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 above patents all provide some improvements and innovative measures for electromagnetic pumps, but the electromagnetic pumps are all applied at a small working flow rate, and do not mention a method for inhibiting unstable flow in a high-flow pump, and the pump body structure is complex and the processing and manufacturing are difficult.
The invention aims at large ALIP design, improves the flow stability in the pump and enlarges the high-efficiency area of the pump by redesigning the stator structure, and provides possibility for the design and manufacture of 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 self-current-stabilizing cylindrical linear induction electromagnetic pump, which comprises a flow channel inner pipe, a flow channel outer pipe, an inner stator and an integral outer stator, wherein the flow channel inner pipe is connected with the flow channel outer pipe;
the flow channel inner pipe and the flow channel outer pipe are coaxially arranged, a flow channel for containing liquid metal is formed between the flow channel inner pipe and the flow channel outer pipe, the inner stator is positioned inside the flow channel inner pipe, and the integral outer stator is positioned outside the flow channel outer pipe;
the both ends of whole outside stator are equipped with tip location chuck, whole outside stator includes two at least sections sub outside stators, every section sub outside stator is the split stator, and is adjacent two sections be equipped with middle location chuck between the sub outside stator, adjacent two sections sub outside stator is along the even staggered arrangement of circumference for restrain the unstable flow of liquid metal in the runner.
Optionally, the integral outer stator comprises N sections of the sub outer stators, wherein N is more than or equal to 2 and N is an even number.
Alternatively, the ratio of the circumferential angle β corresponding to the circumferential length of the stator core of the integrated outer stator 10 to the circumferential angle α corresponding to the circumferential length of the air gap is not less than 1 and not more than 2.
Optionally, the lengths of the sub-outer stators of two adjacent segments are equal.
Optionally, the sub-outer stator includes a stator core and an energizing coil, and a winding of the energizing coil is wound along a circumferential direction of the runner outer tube and filled in each coil slot of the sub-outer stator.
Optionally, the energizing coil adopts a Y-shaped wiring mode.
Optionally, the pole pitch of the traveling wave magnetic field excited by the energized coil in each section of the sub-outer stator coil slot and the length L of each section of the sub-outer statoriThe ratio of (A) to (B) is not more than 1/6 and not less than 1/10.
Optionally, the outer runner pipe, the inner runner pipe, the intermediate positioning chuck and the end 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 integral outer stator.
Optionally, the integral outer stator and the inner stator are formed by laminating multiple layers of silicon steel sheets.
By adopting the technical scheme, the self-stabilized cylindrical linear induction electromagnetic pump has the following beneficial effects:
the integral external stator of the electromagnetic pump comprises at least two sections of sub external stators, each section of the sub external stator is a split stator, the front section of the sub external stator and the rear section of the sub external stator are uniformly and alternately arranged along the circumferential direction to reduce circumferential unevenness of axial speed, and the external steady flow stator structure can obviously reduce circumferential distribution unevenness of a magnetic field, reduce disturbance of factors such as non-axial Lorentz force and the like to fluid, and further inhibit unstable flow of liquid metal in a 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 self-ballasted cylindrical linear induction electromagnetic pump;
FIG. 1(b) is a cross-sectional view of FIG. 1 (a);
FIG. 2(a) is a front view of FIG. 1 (b);
FIG. 2(B) is a cross-sectional view taken along sections A-A and B-B of FIG. 2(a), respectively;
fig. 2(c) is a partial enlarged view of D and E in fig. 2 (a).
The following is a supplementary description of the drawings:
1-stator core, 2-electrified coil, 3-middle positioning chuck, 4-end positioning chuck, 5-runner inner tube, 6-runner outer tube, 7-internal stator, 8-integral external stator.
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 self-current-stabilizing cylindrical linear induction electromagnetic pump which is explained by combining the attached drawings 1-2.
A self-current-stabilizing cylindrical linear induction electromagnetic pump comprises a flow channel inner tube (5), a flow channel outer tube (6), an inner stator (7) and an integral outer stator (8);
the flow channel inner tube (5) and the flow channel outer tube (6) are coaxially arranged, a flow channel for containing liquid metal is formed between the flow channel inner tube (5) and the flow channel outer tube (6), the inner stator (7) is positioned inside the flow channel inner tube (5), and the integral outer stator (8) is positioned outside the flow channel outer tube (6);
the two ends of the whole external stator (8) are provided with end positioning chucks (4), the whole external stator (8) comprises at least two sections of external stators, and is adjacent to each other, the middle positioning chuck (3) is arranged between the external stators, and the external stators are uniformly arranged in a staggered manner along the circumferential direction, so that the unstable flow of liquid metal in a flow channel is inhibited.
In the embodiment, the integral external stator (8) comprises at least two sections of sub-external stators, each section of the sub-external stator is a split stator, the front section and the rear section of the sub-external stators are uniformly and alternately arranged along the circumferential direction to reduce circumferential nonuniformity of axial speed, the external steady-flow stator structure can obviously reduce circumferential nonuniformity of a magnetic field, reduce disturbance of factors such as non-axial Lorentz force and the like to fluid, and accordingly inhibit unstable flow of liquid metal in a flow channel.
Referring to fig. 1(a) and 2(b), the front and rear sub-outer stators are uniformly staggered in the circumferential direction, that is, the gap of the i-th sub-outer stator is opposite to the stator core (1) of the i-1-th sub-outer stator and the i + 1-th sub-outer stator.
In the embodiment, the ith section of external stator and the (i-1) th section of external stator are connected with the end positioning chuck (4) through the middle positioning chuck (3) to form an integral external stator (8), and the middle positioning chuck (3) and the end positioning chuck (4) are fixedly connected onto the outer pipe (6) of the flow channel.
In some embodiments, the integral outer stator (8) includes N segments of the sub-outer stators, where N ≧ 2 and N is an even number.
In some embodiments, the ratio of the circumferential angle β corresponding to the circumferential length of the stator core of the unitary outer stator (10) to the circumferential angle α corresponding to the circumferential length of the air gap is no less than 1 and no greater than 2.
In some embodiments, the sub-outer stators are equal in length adjacent to each other. In FIGS. 1(b) and 2(a), L1Section 1 external stator length, LN-length of N-th outer stator, Li-the length of the ith outer stator, i-the serial number of each segment of the overall outer stator except the first segment and the last segment, i being 2-N-1; the i-th segment sub-outer stator length is equal to the i-1-th segment sub-outer stator length is equal to the i + 1-th segment sub-outer stator length, i.e., Li＝Li-1＝Li+1。
In some embodiments, the sub-outer stator includes a stator core (1) and an electric coil (2), and a winding of the electric coil (2) is wound circumferentially along the runner outer tube (6) and filled in each coil slot of the sub-outer stator.
In some embodiments, the current coils (2) are wye wired and each phase of current connects the windings of two current coils.
In some embodiments, the pole pitch of the traveling-wave magnetic field excited by the energized coils in each of the sub-outer stator coil slots and the length L of each of the sub-outer stator slotsiThe ratio of (A) to (B) is not more than 1/6 and not less than 1/10.
In some embodiments, the outer flow passage pipe (6), the inner flow passage pipe (5), the intermediate positioning chuck (3) and the end positioning chuck (4) are all made of demagnetized stainless steel materials.
In some embodiments, a layer of insulation material is laid between the outer runner pipe (6) and the integral outer stator (8).
In some embodiments, the integral outer stator (8) and the inner stator (7) are formed by laminating multiple layers of silicon steel sheets.
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. The external stator effectively improves the distribution nonuniformity of the flow field speed, fluid flowing through the flow channel corresponding to the gap of the i-th section of the external stator flows into the flow channel corresponding to the i + 1-th section of the external stator core, and the Lorentz force borne by the fluid in the flow channel is far greater than that in the previous section, so that the fluid is further accelerated. And the fluid flowing through the flow channel corresponding to the ith section of external stator core flows into the flow channel corresponding to the (i + 1) th section of external stator gap, and the fluid speed in the flow channel is increased far without the core. Therefore, the fluid flows from the front section of the pump to the rear section, the speed difference between the clearance side and the iron core side is greatly improved, the speed gradient along the circumferential direction is reduced, and the unstable flow can be suppressed.
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 (10)
1. The utility model provides a from steady flow cylinder formula linear induction electromagnetic pump which characterized in that: comprises a flow passage inner pipe (5), a flow passage outer pipe (6), an inner stator (7) and an integral outer stator (8);
the flow channel inner tube (5) and the flow channel outer tube (6) are coaxially arranged, a flow channel for containing liquid metal is formed between the flow channel inner tube (5) and the flow channel outer tube (6), the inner stator (7) is positioned inside the flow channel inner tube (5), and the integral outer stator (8) is positioned outside the flow channel outer tube (6);
the two ends of the whole external stator (8) are provided with end positioning chucks (4), the whole external stator (8) comprises at least two sections of sub-external stators, each section of the sub-external stators are split stators, and are adjacent to each other, the middle positioning chucks (3) are arranged between the sub-external stators and are adjacent to each other for two sections of the sub-external stators are uniformly and alternately arranged along the circumferential direction and used for inhibiting the unstable flow of liquid metal in a flow channel.
2. The self-stabilized cylindrical linear induction electromagnetic pump of claim 1, wherein: the integral outer stator (8) comprises N sections of the sub outer stators, wherein N is more than or equal to 2 and is an even number.
3. The self-current-stabilizing cylindrical linear induction electromagnetic pump according to claim 1, wherein the ratio of the circumferential angle β corresponding to the circumferential length of the stator core of the integral outer stator (8) to the circumferential angle α corresponding to the circumferential length of the air gap is not less than 1 and not more than 2.
4. A self-stabilized cylindrical linear induction electromagnetic pump according to any one of claims 1 to 3, characterized in that: and the lengths of the external stators of the two adjacent sections are equal.
5. The self-stabilized cylindrical linear induction electromagnetic pump of claim 4, wherein: the sub-outer stator comprises a stator core (1) and an electrified coil (2), and a winding of the electrified coil (2) is wound along the circumferential direction of the runner outer tube (6) and filled in each coil slot of the sub-outer stator.
6. The self-stabilized cylindrical linear induction electromagnetic pump of claim 5, wherein: the electrified coil (2) adopts a Y-shaped wiring mode.
7. The self-stabilized cylindrical linear induction electromagnetic pump of claim 6, wherein: a ratio of a pole pitch of the traveling-wave magnetic field excited by the energized coils in each of the sub-outer stator coil slots to a length of each of the sub-outer stator slots is not greater than 1/6 and not less than 1/10.
8. A self-stabilized cylindrical linear induction electromagnetic pump according to any one of claims 1 to 3, characterized in that: the runner outer pipe (6), the runner inner pipe (5), the middle positioning chuck (3) and the end positioning chuck (4) are all made of demagnetized stainless steel materials.
9. A self-stabilized cylindrical linear induction electromagnetic pump according to any one of claims 1 to 3, characterized in that: and a layer of heat insulating material is paved between the runner outer pipe (6) and the integral external stator (8).
10. A self-stabilized cylindrical linear induction electromagnetic pump according to any one of claims 1 to 3, characterized in that: the integral external stator (8) and the internal stator (7) are formed by laminating multiple layers of silicon steel sheets.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112311195A (en) * | 2020-09-21 | 2021-02-02 | 江苏大学 | Cylindrical linear induction electromagnetic pump with axial guide vanes |
| RU2765977C2 (en) * | 2020-05-14 | 2022-02-07 | Общество с ограниченной ответственностью «КБ Арматуры и Специального Машиностроения» | Core of a cylindrical linear induction pump and a cylindrical linear induction pump |
| RU2765978C2 (en) * | 2020-05-14 | 2022-02-07 | Общество с ограниченной ответственностью «КБ Арматуры и Специального Машиностроения» | Magnetic core of the inductor of the cylindrical linear induction pump and the cylindrical linear induction pump |
| RU2766431C2 (en) * | 2020-05-14 | 2022-03-15 | Общество с ограниченной ответственностью «КБ Арматуры и Специального Машиностроения» | Cylindrical linear induction pump |
| US11283342B1 (en) | 2021-01-07 | 2022-03-22 | Jiangsu University | Annular linear induction electromagnetic pump having axial guide vanes |
| RU2797349C1 (en) * | 2022-12-23 | 2023-06-02 | Федеральное государственное бюджетное учреждение науки Пермский федеральный исследовательский центр Уральского отделения Российской академии наук | Magnetohydrodynamic pump for electrically conductive liquids |
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| 赵睿杰等: "ALIP电磁泵三维瞬态特性与不稳定流动机理", 《排灌机械工程学报》 * |
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| RU2765977C2 (en) * | 2020-05-14 | 2022-02-07 | Общество с ограниченной ответственностью «КБ Арматуры и Специального Машиностроения» | Core of a cylindrical linear induction pump and a cylindrical linear induction pump |
| RU2765978C2 (en) * | 2020-05-14 | 2022-02-07 | Общество с ограниченной ответственностью «КБ Арматуры и Специального Машиностроения» | Magnetic core of the inductor of the cylindrical linear induction pump and the cylindrical linear induction pump |
| RU2766431C2 (en) * | 2020-05-14 | 2022-03-15 | Общество с ограниченной ответственностью «КБ Арматуры и Специального Машиностроения» | Cylindrical linear induction pump |
| CN112311195A (en) * | 2020-09-21 | 2021-02-02 | 江苏大学 | Cylindrical linear induction electromagnetic pump with axial guide vanes |
| US11283342B1 (en) | 2021-01-07 | 2022-03-22 | Jiangsu University | Annular linear induction electromagnetic pump having axial guide vanes |
| RU2797349C1 (en) * | 2022-12-23 | 2023-06-02 | Федеральное государственное бюджетное учреждение науки Пермский федеральный исследовательский центр Уральского отделения Российской академии наук | Magnetohydrodynamic pump for electrically conductive liquids |
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