阅读说明：本技术 一种交流电驱动液态金属电磁泵 (Alternating current driven liquid metal electromagnetic pump ) 是由 雷作胜 卢海彪 王异军 张辉琪 钟云波 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种交流电驱动液态金属电磁泵,包括前侧磁场发生器、后侧磁场发生器、流体通道。流体通道固定安装在前侧磁场发生器和后侧磁场发生器所夹的空间中,两磁场发生器关于流体通道对称分布,通过在线圈中施加交变电流使流体通道内产生交变磁场,同时通道内的液态金属产生感生电流,该交变磁场与感生电流相互作用产生电磁力,从而驱动流体从流体入口向流体出口流动。本发明可有效提高不同温度的导电流体,如液态金属的传输效率,同时结构简单,且泵体中不存在运动机械部件,安全系数高,适用于冶金、铸造和原子核能等工业领域。(The invention discloses an alternating current driven liquid metal electromagnetic pump which comprises a front side magnetic field generator, a rear side magnetic field generator and a fluid channel. The fluid channel is fixedly arranged in a space between the front magnetic field generator and the rear magnetic field generator, the two magnetic field generators are symmetrically distributed relative to the fluid channel, alternating current is applied to the coil to generate an alternating magnetic field in the fluid channel, meanwhile, liquid metal in the channel generates induced current, and the alternating magnetic field and the induced current interact to generate electromagnetic force, so that the fluid is driven to flow from the fluid inlet to the fluid outlet. The invention can effectively improve the transmission efficiency of conductive fluids with different temperatures, such as liquid metal, has simple structure, does not have moving mechanical parts in the pump body, has high safety coefficient, and is suitable for the industrial fields of metallurgy, casting, nuclear energy and the like.)

1. The utility model provides an alternating current drive liquid metal electromagnetic pump, includes magnetic field generator and fluid passage (11), and magnetic field generator is including front side magnetic field generator (1) and rear side magnetic field generator (2) that both sides set up around being located fluid passage (11), its characterized in that: the front magnetic field generator (1) consists of a front magnetic yoke group and a plurality of front coils (3), wherein the front magnetic yoke group consists of a front magnetic yoke back plate (5) and a plurality of front magnetic yoke end parts (4); the rear magnetic field generator (2) consists of a rear magnetic yoke group and a plurality of rear coils (6), and the rear magnetic yoke group consists of a rear magnetic yoke back plate (8) and a plurality of rear magnetic yoke end parts (7); the fluid channel (11) is fixedly arranged in a space between the front magnetic field generator (1) and the rear magnetic field generator (2), an alternating current is applied to the coil, an alternating magnetic field is generated in the fluid channel (11), and simultaneously, the liquid metal in the fluid channel (11) generates an induced current under the interaction of the alternating magnetic field and the induced current, so that electromagnetic force is generated, and the liquid metal fluid is driven to flow from the fluid inlet (9) to the fluid outlet (10), and the liquid metal is conveyed.

2. An alternating current driven liquid metal electromagnetic pump as claimed in claim 1, wherein: the front magnetic field generator (1) and the rear magnetic field generator (2) are symmetrically distributed relative to the fluid channel (11), and the magnetic poles generated on the two magnetic yokes of the front magnetic field generator (1) and the rear magnetic field generator (2) are opposite.

3. An alternating current driven liquid metal electromagnetic pump as claimed in claim 1, wherein: the power supply mode of the magnetic field generator adopts three-phase alternating current or two-phase alternating current.

4. An alternating current driven liquid metal electromagnetic pump as claimed in claim 1, wherein: the product of the excitation current and the number of coil turns of the magnetic field generator is between 100 and 20000 ampere turns.

5. An alternating current driven liquid metal electromagnetic pump as claimed in claim 1, wherein: the shape of the magnetic yoke back plate adopts a round shape, a semicircular shape or a curve irregular shape.

6. An alternating current driven liquid metal electromagnetic pump as claimed in claim 1, wherein: the fluid channel (11) is made of stainless steel, silicate insulation or glass fibre material.

7. An alternating current driven liquid metal electromagnetic pump as claimed in claim 1, wherein: the fluid channel (11) is a flat ring-shaped channel.

8. An alternating current driven liquid metal electromagnetic pump as claimed in claim 1, wherein: front side yoke backplate (5) and rear side yoke backplate (8) are thin wall ring shape, and the internal diameter is not less than 500mm, and the external diameter is not less than 1000mm, sets up 4 at least yoke tip levels and arranges on the yoke backplate that corresponds, uses yoke backplate center as the centre of a circle, and adjacent yoke tip sets up the contained angle of position and is not higher than 90, and each coil uses concentrated winding at the yoke tip, and the coil material is the copper wire, and the cold-cut mode is the water-cooling.

Technical Field

The invention relates to an electromagnetic pump, in particular to an alternating current driven liquid metal electromagnetic pump which is mainly applied to the field of liquid metal driving equipment.

Background

The electromagnetic pump is an electromagnetic driving technology, and the principle of the electromagnetic pump is that Lorentz force generated by an alternating magnetic field in liquid metal is utilized, so that the purpose of directionally conveying conductive fluid is achieved. Because it has the advantages of no contact with metal, simple structure, convenient maintenance and the like, it is widely applied in the industrial fields of casting, metallurgy, atomic kinetic energy and the like.

Electromagnetic pumps are classified into a conduction type and an induction type according to the supply manner of current in metal. In the conduction type electromagnetic pump, current is led into metal liquid through an inlet electrode and an outlet electrode of a metal channel by an external power supply, the direction of the current is vertical to the direction of a pipeline and a magnetic field, and electromagnetic force is generated according to the left-hand rule to drive liquid metal to flow. The induction type electromagnetic pump mainly uses a permanent magnet pump, and in the existing patent documents, CN202856588U, CN112737275A Chinese patent documents and the like both disclose that a permanent magnet drives a liquid metal electromagnetic pump, and although the permanent magnet pump improves the transmission efficiency of liquid metal, the permanent magnet generates joule heat in the rotating process and has higher temperature under the casting of zinc, magnesium and other metals, so that the permanent magnet is easy to demagnetize at high temperature; meanwhile, in the operation process of the electromagnetic pump, the permanent magnet is in high-speed centrifugal motion, so that the safety of the electromagnetic pump cannot be well guaranteed. Therefore, based on the problems, by combining the theory of electromagnetism, the realization of the efficient and safe alternating current driven liquid metal electromagnetic pump becomes a technical problem to be solved urgently.

Disclosure of Invention

Aiming at the driving requirement of high-temperature molten metal, the invention aims to provide an alternating-current driven liquid metal electromagnetic pump, which effectively solves the problem of demagnetization of a permanent magnet at high temperature, ensures high-efficiency continuous transmission of the high-temperature molten metal, generates a magnetic field through alternating-current driving, has no moving part on a pump body, and can effectively avoid potential safety hazards generated in the high-speed centrifugal rotation process of the permanent magnet.

In order to achieve the purpose, the invention adopts the following technical scheme:

an alternating current drive liquid metal electromagnetic pump comprises a magnetic field generator and a fluid channel, wherein the magnetic field generator comprises a front magnetic field generator and a rear magnetic field generator which are positioned at the front side and the rear side of the fluid channel, the front magnetic field generator consists of a front magnetic yoke group and a plurality of front coils, and the front magnetic yoke group consists of a front magnetic yoke back plate and a plurality of front magnetic yoke end parts; the back side magnetic field generator consists of a back side magnetic yoke group and a plurality of back side coils, and the back side magnetic yoke group consists of a back side magnetic yoke back plate and a plurality of back side magnetic yoke ends; the fluid channel is fixedly arranged in a space clamped by the front magnetic field generator and the rear magnetic field generator, an alternating current is applied to the coil to generate an alternating magnetic field in the fluid channel, and simultaneously, the liquid metal in the fluid channel generates an induced current under the interaction of the alternating magnetic field and the induced current so as to generate electromagnetic force, so that the liquid metal fluid is driven to flow from the fluid inlet to the fluid outlet, and the liquid metal is conveyed

As a preferable technical scheme of the invention, the front magnetic field generator and the rear magnetic field generator are symmetrically distributed relative to the fluid channel, and the magnetic poles generated on the two magnetic yokes of the front magnetic field generator and the rear magnetic field generator are opposite.

As a preferred technical scheme of the invention, the power supply mode of the magnetic field generator adopts three-phase alternating current or two-phase alternating current.

As a preferred technical scheme of the invention, the product of the exciting current of the magnetic field generator and the number of turns of the coil is between 100 and 20000 ampere turns. It is further preferred that the magnetic field generator applies an alternating current of 100-.

As a preferable technical scheme of the invention, the shape of the magnetic yoke back plate adopts a circular shape, a semicircular shape or a curve irregular shape.

As a preferred technical scheme of the invention, the fluid channel is made of stainless steel, silicate heat insulation materials or glass fiber materials.

As a preferred embodiment of the present invention, the fluid passage is a flat ring-shaped passage.

As a preferred technical scheme of the invention, the front side magnetic yoke back plate and the rear side magnetic yoke back plate are thin-wall circular rings, the inner diameter is not less than 500mm, the outer diameter is not less than 1000mm, at least 4 magnetic yoke end parts are horizontally arranged on the corresponding magnetic yoke back plates, the center of each magnetic yoke back plate is taken as a circle center, the included angle of the adjacent magnetic yoke end parts is not higher than 90 degrees, each coil is wound on the end part of each magnetic yoke by a concentrated winding, the coil material is a copper wire, and the cold cutting mode is water cooling.

Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:

1. because the alternating current is adopted to drive the liquid metal, the demagnetization problem of the permanent magnet at high temperature can be effectively avoided, and the transmission efficiency of the liquid metal is greatly improved;

2. the traveling wave magnetic field is obtained by the induction of the winding coil, the structure is simple, the size is small, no moving mechanical part is arranged in the equipment, and the safety coefficient is high.

Drawings

Fig. 1 is a schematic structural diagram of an ac-driven liquid metal electromagnetic pump according to a preferred embodiment of the present invention.

Fig. 2 is a schematic front view of a pair of pole three phase ac powered liquid metal electromagnetic pumps in accordance with a preferred embodiment of the present invention.

Fig. 3 is a diagram illustrating the electromagnetic force distribution of the center section of the fluid channel according to the preferred embodiment of the present invention.

FIG. 4 is a cross-sectional velocity and temperature profile of the center of a fluid passageway in accordance with a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of the front side of a two-stage two-phase AC powered liquid metal electromagnetic pump according to the preferred embodiment of the present invention.

Fig. 6 is a schematic front view of a pair of pole three-phase ac driven traveling wave magnetic field electromagnetic pumps in accordance with a preferred embodiment of the present invention.

In the figure: 1 front magnetic field generator, 2 back magnetic field generator, 3 front coils, 4 front yoke ends, 5 front yoke back plates, 6 back coils, 7 back yoke ends, 8 back yoke back plates, 9 fluid inlets, 10 fluid outlets, 11 fluid channels.

Detailed Description

The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:

the first embodiment is as follows:

referring to fig. 1 and 2, an ac driven liquid metal electromagnetic pump includes a magnetic field generator and a fluid channel 11, the magnetic field generator includes a front magnetic field generator 1 and a rear magnetic field generator 2 disposed at the front and rear sides of the fluid channel 11, the front magnetic field generator 1 is composed of a front magnetic yoke set and a plurality of front coils 3, the front magnetic yoke set is composed of a front magnetic yoke back plate 5 and a plurality of front magnetic yoke end portions 4; the back magnetic field generator 2 consists of a back magnetic yoke group and a plurality of back coils 6, and the back magnetic yoke group consists of a back magnetic yoke back plate 8 and a plurality of back magnetic yoke end parts 7; the fluid channel 11 is fixedly arranged in a space between the front magnetic field generator 1 and the rear magnetic field generator 2, an alternating current is applied to the coil, so that an alternating magnetic field is generated in the fluid channel 11, and an induced current is generated in the liquid metal in the fluid channel 11 under the interaction of the alternating magnetic field and the induced current, so that an electromagnetic force is generated, the liquid metal fluid is driven to flow from the fluid inlet 9 to the fluid outlet 10, and the liquid metal is conveyed.

The problem of demagnetization under the permanent magnet high temperature has been solved effectively to this embodiment electromagnetic pump, guarantees to transmit high temperature metal liquid high-efficiently continuously, and this electromagnetic pump passes through alternating current drive and produces the magnetic field simultaneously, and the pump body does not have moving part, can effectively avoid the high-speed rotatory potential safety hazard that the in-process produced of centrifugation of permanent magnet.

Example two:

this embodiment is substantially the same as the first embodiment, and is characterized in that:

in this embodiment, referring to fig. 1 and fig. 2, the front magnetic field generator 1 and the rear magnetic field generator 2 are symmetrically distributed with respect to the fluid channel 11, and the magnetic poles generated on the two yokes of the front magnetic field generator 1 and the rear magnetic field generator 2 are opposite.

In this embodiment, the magnetic field generator is powered by three-phase ac power or two-phase ac power.

In this embodiment, the product of the excitation current of the magnetic field generator and the number of coil turns is between 100 and 20000 ampere-turns.

In this embodiment, the yoke back plate is circular, semicircular or irregular in curve.

In this embodiment, the fluid passage 11 is made of stainless steel, silicate insulation material or fiberglass material.

In the embodiment, the liquid metal is driven by the alternating current, so that the demagnetization problem of the permanent magnet at high temperature can be effectively avoided, and the transmission efficiency of the liquid metal is greatly improved; the traveling wave magnetic field is obtained by induction of the winding coil, the structure is simple, the size is small, no moving mechanical part exists in equipment, and the safety factor is high.

Example three:

this embodiment is substantially the same as the above embodiment, and is characterized in that:

in the embodiment, as shown in fig. 1-2, the magnetic field generators on the front side and the rear side are both composed of a magnetic yoke group and a coil wound on the magnetic yoke group, the two magnetic field generators are symmetrically distributed about a fluid channel, magnetic poles generated on the two magnetic yokes are opposite, the magnetic yoke group is made of oriented silicon steel with good conductivity, low coercive force and low magnetic loss, a magnetic yoke back plate is a thin-wall circular ring, the inner diameter is 500mm, the outer diameter is 1000mm, the end parts of 6 magnetic yokes are horizontally arranged on the magnetic yoke back plate, and the included angle is 60 degrees; the coil is wound on the end part of the magnetic yoke by a concentrated winding, the material is a copper wire, and the coil is cooled by water in a cold cutting mode. The fluid channel is fixedly arranged in a space clamped by the front magnetic field generator and the rear magnetic field generator, is a flat annular channel made of stainless steel, and has the width of 300mm and the thickness of 50 mm. 8000 ampere-turns of three-phase alternating current are respectively applied to the front side magnetic field generator and the rear side magnetic field generator, so that an alternating magnetic field is generated in the fluid channel, meanwhile, the liquid metal in the channel generates induced current, and the alternating magnetic field and the induced current interact to generate electromagnetic force, so that the fluid is driven to flow from the fluid inlet to the fluid outlet.

The exciting current of the present embodiment is 200A, and the electromagnetic force, the speed and the temperature distribution of the central section of the fluid passage at the frequency of 50Hz are respectively shown in fig. 3 and fig. 4. At the central section, the direction of the electromagnetic force is directed from the fluid inlet to the fluid outlet, and the liquid metal also moves from the fluid inlet to the fluid outlet as a result of the driving of the electromagnetic force. Meanwhile, the temperature of the fluid outlet is increased by 1.5K compared with the initial temperature of 300K due to the action of Joule heat.

This embodiment alternating current drive liquid metal electromagnetic pump can effectively strengthen the transmission efficiency of liquid metal, its simple structure, and pump body motion mechanical parts, and factor of safety is high.

Example four:

this embodiment is substantially the same as the above embodiment, and is characterized in that:

in this embodiment, as shown in fig. 5, the front and rear magnetic field generators are composed of a magnetic yoke group and a coil wound around the magnetic yoke group, the two magnetic field generators are symmetrically distributed about the fluid channel, magnetic poles generated on the two magnetic yokes are opposite, the magnetic yoke group is made of oriented silicon steel with good conductivity, low coercive force and low magnetic loss, the magnetic yoke back plate is a thin-wall circular ring, the inner diameter is 500mm, the outer diameter is 1000mm, 8 magnetic yoke end portions are horizontally arranged on the magnetic yoke back plate, the included angle is 45 °, the coil is wound around the magnetic yoke end portions by concentrated windings, the coil is made of copper wires, and the cold cutting mode is water cooling. The fluid channel is fixedly arranged in a space between the front magnetic field generator and the rear magnetic field generator, is a flat ring-shaped channel made of stainless steel, and has the width of 300mm and the thickness of 50 mm. 10000 ampere-turn two-phase alternating current is respectively applied to the front side magnetic field generator and the rear side magnetic field generator, so that an alternating magnetic field is generated in the fluid channel, meanwhile, the liquid metal in the channel generates induced current, and the alternating magnetic field and the induced current interact to generate electromagnetic force, so that the fluid is driven to flow from the fluid inlet to the fluid outlet.

This embodiment alternating current drive liquid metal electromagnetic pump can effectively strengthen the transmission efficiency of liquid metal, its simple structure, and does not have the motion mechanical parts in the pump body, and factor of safety is high.

Example five:

in this embodiment, as shown in fig. 6, the front and rear magnetic field generators are composed of a magnetic yoke group and a coil wound around the magnetic yoke group, the two magnetic field generators are symmetrically distributed about the fluid channel, magnetic poles generated on the two magnetic yokes are opposite, the magnetic yoke group is made of oriented silicon steel with good conductivity, low coercive force and low magnetic loss, the magnetic yoke back plate is curved along the fluid channel, the end portions of the 6 magnetic yokes are horizontally arranged on the magnetic yoke back plate, the coil is wound around the end portion of the magnetic yoke by a concentrated winding, the coil is made of copper wire, and the cold cutting mode is water cooling. The fluid channel is fixedly arranged in a space between the front magnetic field generator and the rear magnetic field generator, is a flat ring-shaped channel made of glass fiber materials, and has the width of 300mm and the thickness of 50 mm. 12000 ampere-turn two-phase alternating current is respectively applied to the front side magnetic field generator and the rear side magnetic field generator, so that an alternating magnetic field is generated in the fluid channel, meanwhile, the liquid metal in the channel generates induced current, and the alternating magnetic field and the induced current interact to generate electromagnetic force, so that the fluid is driven to flow from the fluid inlet to the fluid outlet.

This embodiment alternating current drive liquid metal electromagnetic pump can effectively strengthen the transmission efficiency of liquid metal, its simple structure, and the pump body does not have motion mechanical parts, and factor of safety is high.

In summary, the alternating current driven liquid metal electromagnetic pump of the above embodiment includes a front side magnetic field generator, a rear side magnetic field generator, and a fluid channel. The fluid channel is fixedly arranged in a space between the front magnetic field generator and the rear magnetic field generator, the two magnetic field generators are symmetrically distributed relative to the fluid channel, alternating current is applied to the coil to generate an alternating magnetic field in the fluid channel, meanwhile, liquid metal in the channel generates induced current, and the alternating magnetic field and the induced current interact to generate electromagnetic force, so that the fluid is driven to flow from the fluid inlet to the fluid outlet. The embodiment can effectively improve the transmission efficiency of conductive fluid with different temperatures, such as liquid metal, has a simple structure, does not have moving mechanical parts in the pump body, has high safety coefficient, and is suitable for the industrial fields of metallurgy, casting, nuclear energy and the like.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the embodiments, and various changes and modifications can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention shall be equivalent substitutions, so long as the technical principle and the inventive concept of the ac electric driving liquid metal electromagnetic are met, and the present invention shall fall within the protection scope of the present invention.