Variable high-intensity magnetic field generating device

Abstract

The utility model belongs to the technical field of variable strong magnetic fields. The utility model provides a variable strong magnetic field generating device which comprises a pure iron shell cone, a pole magnet assembly, a conical neodymium iron boron permanent magnet, an aluminum rear isolation plate, a feeding pure iron magnetic conduction shaft, a pure iron magnetic conduction shaft support and a magnetic conduction shaft feeding mechanism. A conical neodymium iron boron permanent magnet, a magnetic pole magnet assembly, an aluminum rear isolation plate and a pure iron magnetic conductive shaft bracket are sequentially arranged from the head part to the tail part of the pure iron shell cone; the pole magnet assembly is fixed on the cylinder part in the pure iron shell cone; the pole magnet assembly is cylindrical and sequentially comprises a pure copper magnetic pole wrapping shell, a fan-shaped neodymium iron boron permanent magnet arranged in a pure copper magnetic pole isolation frame and a magnetic conduction shaft feeding channel from outside to inside. Local conduction of the permanent magnet is accurately adjusted, and the surface magnetic line density of the surface of the sample is changed, so that the effect of changing the magnetic field intensity is achieved. Magnetic circuits of the magnetic conduction shaft adjusting mechanism are sequentially communicated, and the purpose of finely adjusting the magnetic field intensity is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of variable strong magnetic field. Background Art

[0002] Generally, the equipment of a general unit only generates a variable alternating magnetic field, which is generated by using the commercial power supply and an alternating current coil, and at most can generate a stable magnetic field below 0.2T (Tesla) for a long time. If a strong magnetic field of 1T (Tesla) or more needs to be generated stably for a long time, it is necessary to transform the room power supply equipment, have a power amplifier with a power of dozens of kilowatts, and a specially made transformer and circuit control system to achieve it. Not only the cost is high, but also the adjustable magnetic field is generated by a large current coil, with high energy consumption, large volume, requiring a special cooling system, poor stability of the magnetic field intensity, and large interference to the entire circuit system during operation after startup, which is likely to cause damage to the equipment (including other equipment in the house).

[0003] A magnetic field is generated by an electric current. By adjusting the magnitude of the electric current, the magnetic induction intensity can be changed. If a stable magnetic field exceeding 1 Tesla is required between the magnetic poles, a large current, a large transformer, a separate room power supply system, and a special cooling system are needed.

[0004] A magnetic field is generated by a permanent magnet. By adjusting the magnetic pole gap, the magnetic induction intensity can be changed. It is not convenient to adjust the magnetic pole gap, the adjusting mechanism occupies a large area, and the electric adjusting mechanism is complex.

[0005] With the relative position of the magnetic poles unchanged, the magnetic field intensity is changed by changing the width of the magnetic circuit channel. It is not convenient to adjust the width of the magnetic circuit channel, the adjusting mechanism is complex, the structure operation is unreliable, it occupies a large area, the electric adjusting mechanism is complex, and the manual adjustment is also not convenient. Summary of the Utility Model

[0006] In view of this, the utility model provides a variable strong magnetic field generating device, including: a pure iron outer shell cone, a pole magnet assembly, a conical neodymium iron boron permanent magnet, an aluminum rear isolation plate, a feeding pure iron magnetic conduction shaft, a pure iron magnetic conduction shaft bracket, and a magnetic conduction shaft feeding mechanism;

[0007] The pure iron outer shell cone has a conical head and a cylindrical tail;

[0008] A conical neodymium iron boron permanent magnet, a pole magnet assembly, an aluminum rear isolation plate, and a pure iron magnetic conduction shaft bracket are sequentially arranged from the head to the tail of the pure iron outer shell cone;

[0009] The conical neodymium iron boron permanent magnet is arranged in the head cone of the pure iron outer shell cone;

[0010] The pole magnet assembly is fixed in the cylindrical part inside the pure iron outer shell cone;

[0011] The polar magnet assembly is cylindrical and sequentially includes, from outside to inside: a pure copper magnetic pole wrapping shell, a sector-shaped neodymium iron boron permanent magnet disposed within a pure copper magnetic pole isolation frame, and a magnetic conduction shaft feed channel;

[0012] The polar magnet assembly is fixed to the cylindrical portion of the pure iron outer shell cone;

[0013] A magnetic conduction shaft channel opening is provided at the center of the aluminum rear isolation plate;

[0014] The pure iron magnetic conduction shaft bracket is fixedly connected to the pure iron outer shell cone; a magnetic conduction shaft channel opening is provided at the center.

[0015] By precisely adjusting the local conduction of the permanent magnet, the present utility model changes the surface magnetic force line density of the sample, thereby achieving the effect of changing the magnetic field intensity. Through the magnetic circuit of the magnetic conduction shaft adjustment mechanism being sequentially connected, the purpose of finely adjusting the magnetic field intensity is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic exploded view of a variable strong magnetic field generating device.

[0017] Among them, 1 is the pure iron outer shell cone, 2 is the conical neodymium iron boron permanent magnet, 3 is the pure copper magnetic pole wrapping shell, 4 is the pure copper magnetic pole isolation frame, 5 is the sector-shaped neodymium iron boron permanent magnet, 6 is the aluminum rear isolation plate, 7 is the feeding pure iron magnetic conduction shaft, 8 is the pure iron magnetic conduction shaft bracket, and 9 is the magnetic conduction shaft feeding mechanism.

[0018] Figure 2 is a schematic diagram of a pair of variable strong magnetic field generating devices.

[0019] Figure 3 is a diagram of the polar magnet assembly.

[0020] Among them, 3 is the pure copper magnetic pole wrapping shell, 4 is the pure copper magnetic pole isolation frame, 5 is the sector-shaped neodymium iron boron permanent magnet, and 10 is the magnetic conduction shaft feed channel.

[0021] Figure 4 is a schematic cross-sectional view of a variable strong magnetic field generating device.

[0022] Among them, 1 is the pure iron outer shell cone, 2 is the conical neodymium iron boron permanent magnet, 3 is the pure copper magnetic pole wrapping shell, 4 is the pure copper magnetic pole isolation frame, 5 is the sector-shaped neodymium iron boron permanent magnet, 6 is the aluminum rear isolation plate, 7 is the feeding pure iron magnetic conduction shaft, 8 is the pure iron magnetic conduction shaft bracket, 9 is the magnetic conduction shaft feeding mechanism, and 11 is the variable strong magnetic field bracket.

[0023] Figure 5 is a schematic diagram of a pair of variable strong magnetic field generating devices. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Example 1

[0025] This patent can provide a variable high - intensity magnetic field generating device with low energy consumption, high - intensity magnetic field, precise fine - tuning of magnetic field intensity, small size and light weight.

[0026] Magnetic induction intensity: The number of magnetic force lines perpendicular to the unit area. The magnetic induction intensity is also called magnetic flux density, that is, the magnetic flux per unit area, denoted by B. Its unit is Weber per square meter (Wb / m²) or Tesla (T). The definition of magnetic induction intensity B is: B = μ0(H + M), where H and M are the magnetization intensity and magnetic field intensity respectively, and μ0 is the magnetic permeability of vacuum.

[0027] Magnetic field intensity: Refers to the magnitude of the magnetic field at a certain place in space, denoted by H, and its unit is Ampere per meter (A / m).

[0028] Magnetization intensity: Refers to the vector sum of the magnetic moments per unit volume inside the material, denoted by M, and the unit is Ampere per meter (A / m).

[0029] Magnetic flux: The total magnetic induction intensity within a given area. When the magnetic induction intensity B is uniformly distributed on the surface A of the magnet, the general formula for magnetic flux Φ is Φ = B×A. The SI unit of magnetic flux is Maxwell.

[0030] Magnetic field units: Oe (Oersted), A / m, T (Tesla). 1T = 1000mT, 1mT = 10Gs, 1Gs = 79.6A / m. 1T (Tesla) = 10000Gs (Gauss) = 1Wb / M². 1Gs (Gauss) = 1Oe (Oersted).

[0031] The utility model provides a variable high - intensity magnetic field generating device, including: a pure - iron outer shell cone, a pole magnet assembly, a conical neodymium - iron - boron permanent magnet, a pure - copper magnetic - pole wrapping shell, a pure - copper magnetic - pole isolation frame, a sector - shaped neodymium - iron - boron permanent magnet, an aluminum rear isolation plate, a feeding pure - iron magnetic - conduction shaft, a pure - iron magnetic - conduction shaft bracket, and a magnetic - conduction shaft feeding mechanism. The pure - iron outer shell cone has a conical head and a cylindrical tail.

[0032] The conical neodymium - iron - boron permanent magnet is arranged in the head cone of the pure - iron outer shell cone.

[0033] The conical neodymium - iron - boron permanent magnet, the pole magnet assembly, the aluminum rear isolation plate, and the pure - iron magnetic - conduction shaft bracket are sequentially arranged from the head to the tail of the pure - iron outer shell cone.

[0034] The pole magnet assembly is fixed in the cylindrical part inside the pure - iron outer shell cone.

[0035] The pole magnet assembly is cylindrical and includes, from the outside to the inside: a pure - copper magnetic - pole wrapping shell, a sector - shaped neodymium - iron - boron permanent magnet arranged inside the pure - copper magnetic - pole isolation frame, and a magnetic - conduction shaft feeding channel.

[0036] The pole magnet assembly is fixed in the cylindrical part of the pure - iron outer shell cone.

[0037] A magnetic conduction axis channel opening is provided at the center of the aluminum rear isolation plate;

[0038] The pure iron magnetic conduction axis bracket is fixedly connected to the pure iron outer shell cone; a magnetic conduction axis channel opening is provided at the center;

[0039] The sector-shaped neodymium iron boron permanent magnet is divided into N equal parts as needed. In this embodiment, ten equal parts are taken as an example; the magnetic induction intensity of the sector-shaped neodymium iron boron permanent magnet is 1 tesla to 2 teslas; after the sector-shaped neodymium iron boron permanent magnet is loaded into the pure copper magnetic pole isolation frame, it is then loaded into the pure copper magnetic pole wrapping outer shell. Then the whole is loaded into the cylindrical part of the pure iron outer shell cone. The aluminum rear isolation plate, the feeding pure iron magnetic conduction axis, the pure iron magnetic conduction axis bracket, and the magnetic conduction axis feeding mechanism are sequentially arranged at the rear of the whole of the three components, and the whole is fixed.

[0040] The magnetic conduction axis feeding mechanism is arranged on the pure iron magnetic conduction axis bracket and is fixedly connected to the magnetic conduction axis, and is used to push the magnetic conduction axis forward and backward in the magnetic conduction axis channel opening, so as to realize the on-off of part of the magnetic circuit, and further realize the control of the magnitude of the magnetic induction intensity.

[0041] The motor energy consumption of the magnetic conduction axis feeding mechanism < 100W.

[0042] The feeding depth of the feeding pure iron magnetic conduction axis adjusts the on-off of part of the magnetic circuit to achieve the adjustment of the magnetic induction intensity. The adjustment accuracy is 10% (or 1 / N) of the maximum magnetic induction intensity of the sector-shaped neodymium iron boron permanent magnet. If necessary, the maximum magnetic field intensity can also be appropriately increased.

[0043] The variable strong magnetic field generating device provided by the present utility model has an overall diameter < 100mm, a total length < 180 (including two magnetic conduction axis feeding motors, or manual adjustment); the total weight < 10Kg; it is small in size, light in weight, and small in energy consumption; the parts are fixed by conventional processing means such as inlaying, riveting, and welding; ensuring safety and reliability.

[0044] Magnetic field intensity adjustment formula;

[0045] T1 = the fixed magnetic field intensity of the neodymium iron boron permanent magnet in the pure iron outer shell cone;

[0046] T2 = the maximum magnetic field intensity formed by all sector-shaped neodymium iron boron permanent magnets;

[0047] T3 = the final magnetic field intensity of the instrument after adjustment by the magnetic conduction axis feeding motor:

[0048] T3 = T1 + T2 * (N - x) * 1 / N; N = the total number of subdivisions of the sector-shaped neodymium iron boron permanent magnet, x = the number of conducting sector-shaped neodymium iron boron permanent magnets, x < N.

[0049] The utility model changes the surface magnetic field line density of the sample by precisely adjusting the partial conduction of the permanent magnet, so as to change the magnetic field strength. The magnetic circuit is sequentially connected through the magnetic conduction axis adjustment mechanism to achieve the purpose of finely adjusting the magnetic field strength.

Claims

1. A variable-strength magnetic field generating device, characterized in that: include: Pure iron shell cone, pole magnet assembly, conical NdFeB permanent magnet, aluminum rear isolation plate, feeding pure iron magnetic shaft, pure iron magnetic shaft bracket, magnetic shaft feeding mechanism; The pure iron shell cone has a conical head and a cylindrical tail; A conical NdFeB permanent magnet, a magnetic pole magnet assembly, an aluminum rear isolation plate and a pure iron magnetic shaft bracket are sequentially arranged from the head to the tail of the pure iron shell cone; The conical NdFeB permanent magnet is arranged in the head cone of the pure iron shell cone; The pole magnet assembly is fixed to the cylindrical portion within the cone of the pure iron housing; The pole magnet assembly is cylindrical, and includes, from outside to inside, a pure copper pole wrapping shell, a fan-shaped NdFeB permanent magnet arranged in a pure copper pole isolation frame, and a magnetic shaft feed channel; The pole magnet assembly is fixed to the cylindrical portion of the pure iron shell cone; A magnetic guide axis passage opening is provided at the center of the aluminum rear isolation plate; The pure iron magnetic shaft bracket is fixedly connected to the pure iron shell cone; a magnetic shaft passage opening is arranged at the center.

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