阅读说明：本技术 一种高效液态金属磁流体泵 (High-efficient liquid metal magnetofluid pump ) 是由 赵凌志 彭爱武 陈小强 李建 王�锋 刘保林 李然 夏琦 刘艳娇 张庆贺 沙次文 于 2020-07-02 设计创作，主要内容包括：本发明公开了一种高效液态金属磁流体泵,由直线形磁流体通道、六面体永磁磁体、边框轭铁和平板形电极组成；采用闭合磁路和对称结构,大大降低了外部漏磁场、提高了工作气隙磁场强度,进而提高了液态金属磁流体泵的泵送能力、效率和电磁兼容性,降低了泵的外形尺寸和重量。(The invention discloses a high-efficiency liquid metal magnetofluid pump, which consists of a linear magnetofluid channel, a hexahedral permanent magnet, a frame yoke and a flat plate-shaped electrode; by adopting a closed magnetic circuit and a symmetrical structure, the external leakage magnetic field is greatly reduced, the working air gap magnetic field intensity is improved, the pumping capacity, the efficiency and the electromagnetic compatibility of the liquid metal magnetic fluid pump are further improved, and the overall dimension and the weight of the pump are reduced.)

1. The utility model provides a high-efficient liquid metal magnetic fluid pump which characterized in that: the liquid metal magnetofluid pump consists of a magnetofluid channel (1), permanent magnets (2-1 and 2-2), a frame yoke iron (3) and electrodes (4-1 and 4-2), and adopts a symmetrical structure and a closed magnetic circuit; the permanent magnets (2-1 and 2-2) are symmetrically arranged at two sides of the magnetic fluid channel (1) along the X direction, the frame yoke iron (3) is arranged at the periphery of the permanent magnets (2-1 and 2-2), and the electrodes (4-1 and 4-2) are arranged on two inner wall surfaces parallel to the magnetic field direction in the magnetic fluid channel (1); the magnetic fluid channel (1) is a linear flow channel and sequentially comprises an inlet (1-1), an effective section (1-2) and an outlet (1-3) in the flow direction; electrodes (4-1, 4-2) are arranged on the inner walls of the upper wall surface and the lower wall surface along the Z direction in the effective section (1-2) of the magnetic fluid channel (1), the effective section (1-2) of the magnetic fluid channel (1) is positioned between the inlet (1-1) and the outlet (1-3), and the effective section (1) of the magnetic fluid channel (1)The section of the section (1-2) is rectangular, the effective section (1-2) of the magnetic fluid channel (1) is an electric field, magnetic field and flow field action area, and the inlet (1-1) and the outlet (1-3) of the magnetic fluid channel (1) are positioned at the two ends of the effective section (1-2) and are connected with an external pipeline; the permanent magnets (2-1 and 2-2) are cuboids, the magnetizing direction of the permanent magnets is along the X direction, and the permanent magnets and the frame yoke iron (3) form a closed magnetic circuit; the frame yoke iron (3) adopts a symmetrical structure and is symmetrical along X, Y and Z directions, the frame yoke iron (3) is tightly attached to the outer surfaces of the permanent magnets (2-1, 2-2) along the X direction, and the frame yoke iron (3) is spaced from the permanent magnets (2-1, 2-2) along the Y direction by a distance d ₁Not less than the X-direction outer dimension d of the magnetic fluid channel (1)₂The areas of the frame yoke iron (3) corresponding to the inlet (1-1) and the outlet (1-3) of the magnetic fluid channel (1) are hollow, wherein the hollow section is determined according to an external connecting pipeline; the electrodes (4-1, 4-2) are plate-shaped.

2. The liquid metal magnetic fluid pump of claim 1, wherein: permanent-magnet (2-1, 2-2) adopt neodymium iron boron, frame yoke (3) are high magnetic conductivity material: electrician pure iron or steel Q235; the magnetic fluid channel (1) is made of a non-magnetic and non-conductive material; the electrodes (4-1, 4-2) are made of oxygen-free copper or red copper.

Technical Field

The invention relates to a magnetic fluid pump, in particular to a high-efficiency liquid metal magnetic fluid pump with low magnetic leakage.

Background

The magnetofluid pump is a pumping device for conductive fluid, and utilizes the interaction between an electric field and a magnetic field in the conductive fluid, such as liquid metal, blood, human body fluid, seawater and the like, to generate electromagnetic force to drive the conductive fluid to flow. The motor and the pump body of the magnetic fluid pump are integrated, and a rotating mechanical part and a transmission shaft system are not arranged, so that the reliability is improved, the mechanical noise is reduced, and the magnetic fluid pump is widely applied to the fields of seawater and liquid metal conveying, biological microfluid driving and controlling, blood pumps and the like. Fig. 1 shows a liquid metal magnetofluid pump for a liquid metal circulating cooling system, which is mainly composed of a linear magnetofluid channel 1, an upper permanent magnet 2, a lower permanent magnet 2 and a flat plate-shaped electrode 3, and has a simple structure. The magnetic fluid channel 1 penetrates through the working air gap, and the magnetic field generated by the upper permanent magnet 2 and the lower permanent magnet 2 is closed through the working air gap and the peripheral air gap. Therefore, the magnetic circuit of the liquid metal magnetofluid pump shown in fig. 1 is an open magnetic circuit, and external magnetic flux leakage is large, thereby reducing the magnetic flux density B in the working air gap and exerting an adverse effect on peripheral electronic devices.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a high-efficiency liquid metal magnetofluid pump with low magnetic leakage. The invention adopts a closed magnetic circuit structure, thereby greatly reducing the external leakage magnetic field, improving the working air gap magnetic field intensity, further improving the pumping capacity, efficiency and electromagnetic compatibility of the liquid metal magnetofluid pump, and reducing the overall dimension and weight of the pump.

The technical scheme of the invention is as follows: the liquid metal magnetofluid pump adopts a symmetrical structure and a closed magnetic circuit and consists of a magnetofluid channel, two permanent magnets, a frame yoke and a pair of electrodes; two permanent magnets are symmetrically arranged at two sides of the magnetic fluid channel, and the frame yokes are arranged around the two permanent magnetsAnd the pair of electrodes are arranged on two inner wall surfaces parallel to the magnetic field direction in the magnetic fluid channel. The magnetic fluid channel is a linear flow channel and sequentially comprises an inlet, an effective section and an outlet in the flow direction; electrodes are arranged on the inner walls of two wall surfaces parallel to the direction of the magnetic field in the effective section of the magnetic fluid channel, the section of the effective section is rectangular, the effective section is positioned between the inlet and the outlet and is an action area of an electric field, a magnetic field and a flow field; the inlet and the outlet are positioned at two sides of the effective section and are connected with an external pipeline. The permanent magnet is a cuboid, the magnetizing direction of the permanent magnet is vertical to the flowing direction and the electric field direction in the magnetic fluid channel, and the permanent magnet and the frame yoke iron form a closed magnetic circuit. The frame yoke iron adopts a symmetrical structure and is symmetrical along X, Y and Z directions; the frame yoke iron clings to the outer surface of the permanent magnet along the X direction, and the frame yoke iron is spaced from the permanent magnet along the Y direction by a distance d ₁Not less than the distance d between two permanent magnets₂(ii) a The areas of the frame yoke iron corresponding to the inlet and the outlet of the magnetic fluid channel are hollow, wherein the hollow section is determined according to an external connecting pipeline. The electrodes are plate-shaped.

The permanent magnet can adopt neodymium iron boron; the frame yoke is made of high-magnetic-permeability materials, such as electrician pure iron or steel Q235; the magnetic fluid channel is made of non-magnetic and non-conductive materials such as polyformaldehyde and the like; the electrode is made of oxygen-free copper or red copper.

Drawings

FIG. 1 is a diagram of a prior art liquid metal magnetic fluid pump for a liquid metal hydronic cooling system, 1 magnetic fluid channel, 2 permanent magnet, 3 electrodes, B magnetic flux density, J current density, V liquid metal velocity;

FIG. 2 is a three-dimensional schematic of an embodiment of the present invention: 1 magnetic fluid channel, 2-1 and 2-2 permanent magnet, 3 frame yoke iron;

fig. 3 is a three-dimensional schematic view of a magnetic fluid channel 1 according to a specific embodiment of the invention: 1-1 inlet, 1-2 effective section, 1-3 outlet, 4-1 and 4-2 plate electrode;

FIG. 4 is a typical planar magnetic field vector distribution for a specific embodiment of the present invention;

FIG. 5 is a leakage magnetic field distribution of an embodiment of the present invention;

FIG. 6 is a typical straight path magnetic flux density profile for an embodiment of the present invention;

FIG. 7 is a typical planar magnetic field vector distribution for a frameless yoke corresponding to an embodiment of the present invention;

fig. 8 is a distribution of leakage magnetic field of a frameless yoke according to an embodiment of the present invention;

fig. 9 is a typical straight path flux density distribution for a frameless yoke corresponding to an embodiment of the present invention.

Detailed Description

The invention is further described with reference to the following drawings and detailed description.

As shown in fig. 2 and 3, the embodiment of the present invention is composed of a magnetic fluid channel 1, permanent magnets 2-1 and 2-2, a frame yoke 3 and electrodes 4-1 and 4-2, and adopts a symmetrical structure and a closed magnetic circuit; the permanent magnets 2-1 and 2-2 are symmetrically arranged at two sides of the magnetic fluid channel 1 along the X direction, the frame yoke 3 is arranged at the periphery of the permanent magnets 2-1 and 2-2, and the electrodes 4-1 and 4-2 are arranged on two inner wall surfaces of the magnetic fluid channel 1 parallel to the magnetic field direction; the magnetic field direction is along + X, the electric field direction is + Z, and the flow direction is + Y. The magnetic fluid channel 1 consists of an inlet 1-1, an effective section 1-2 and an outlet 1-3 and is a linear flow channel; electrodes 4-1 and 4-2 are arranged on the upper wall surface and the lower wall surface of the effective section 1-2 of the magnetic fluid channel 1 in the Z direction, the electrode 4-1 is a cathode, and the electrode 4-2 is an anode; the effective section 1-2 of the magnetic fluid channel 1 is positioned between the inlet 1-1 and the outlet 1-3, the section of the magnetic fluid channel is rectangular, and the magnetic fluid channel is an electric field, a magnetic field and a flow field action area; the inlet 1-1 is positioned at the left side of the effective section 1-2, the outlet 1-3 is positioned at the right side of the effective section 1-2, and the inlet 1-1 and the outlet 1-3 are connected with an external pipeline; the magnetic fluid channel 1 adopts non-magnetic conductive and non-conductive polyformaldehyde. The permanent magnets 2-1 and 2-2 are cuboids; the magnetizing directions of the permanent magnets 2-1 and 2-2 are along the + X direction; the permanent magnets 2-1 and 2-2 and the frame yoke 3 form a closed magnetic circuit; permanent magnets 2-1 and 2-2 are neodymium iron boron N52M. The frame yoke 3 adopts a symmetrical structure and is symmetrical along X, Y and Z directions; the frame yoke 3 is made of electrician pure iron; the frame yoke 3 is closely attached to the outer surfaces of the permanent magnets 2-1 and 2-2 along the X direction, and the distance d between the frame yoke 3 and the permanent magnets 2-1 and 2-2 along the Y direction ₁X-direction outer ruler of magnetic fluid channel 1Cun d₂(ii) a The areas of the frame yoke 3 corresponding to the inlet 1-1 and the outlet 1-3 of the magnetic fluid channel 1 are hollow, and the hollow section is determined according to an external connecting pipeline. The electrodes 4-1 and 4-2 are flat plates made of red copper or oxygen-free copper.

Fig. 4 shows the distribution of the magnetic flux density vector in the XY plane with Z equal to 0 in the embodiment of the present invention. It can be seen that the magnetic fields generated by the permanent magnets 2-1 and 2-2 are closed by the air gap where the magnetic fluid channel 1 is located and the frame yoke 3; the magnetic field direction in the effective section 1-2 of the magnetic fluid channel 1 is + X direction.

Fig. 5 is a leakage magnetic field distribution corresponding to fig. 4. It can be seen that the leakage magnetic field is 50Gs 40mm away from the outer surfaces of the permanent magnets 2-1 and 2-2 of the embodiment of the invention.

Fig. 6 shows the flux density distribution with X-Z-0, corresponding to the air gap center line in fig. 4. It can be seen that the flux density in the air gap is a flat wave distribution along the Y direction with a central field of 0.9T.

Fig. 7 to 9 show magnetic field distributions of the open magnetic circuit of the frameless yoke 3 according to the embodiment of the present invention. It can be seen that the frameless yoke iron enhances the leakage magnetic field and reduces the magnetic flux density in the air gap. As shown in fig. 8, the leakage magnetic field is 50Gs at a distance of 27mm from the outer surface of the permanent magnet. As shown in fig. 9, the air gap center field is about 0.825T.