CN205308566U - Produce coil magnetism system of gradient low -intensity magnetic field - Google Patents
Produce coil magnetism system of gradient low -intensity magnetic field Download PDFInfo
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- CN205308566U CN205308566U CN201521018298.5U CN201521018298U CN205308566U CN 205308566 U CN205308566 U CN 205308566U CN 201521018298 U CN201521018298 U CN 201521018298U CN 205308566 U CN205308566 U CN 205308566U
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Abstract
The utility model discloses a produce coil magnetism system of gradient low -intensity magnetic field, including the cavity pipeline with around locating a plurality of groups coil assembly on the cavity pipeline, a plurality of groups coil assemblies along the axial of cavity pipeline interval arrangement in proper order, each coil assembly is all around being equipped with the multilayer in the radial orientation of cavity pipeline, and the number of turns and the equal block -by -block of the number of piles of the orientation coil group along cavity pipeline one end to the other end increase. This coil magnetism system can produce a handstand top type background magnetic field around the hollow chamber of cavity pipeline and coil assembly after exerting excitation current, the magnetic field gradient that produces in the hollow chamber of cavity pipeline axial changes for a short time, and magnetic field intensity distributes evenly to radial magnetic field gradient size increases earlier and afterwards reduces to zero, and last reverse sharply the increase to the maximum value sharply reduces again, relapses to form " with one climax following another " state many times. The rate of recovery that fine grain magnetic mineral can be improved in the magnetic field of this characteristic reduces magnetic particle and gangue granule result in the magnetic particle because of magnetism is mingled with loss.
Description
Technical field
The utility model relates to coil magnetic system technical field, is specifically related to a kind of coil magnetic system producing gradient low-intensity magnetic field.
Background technology
In existing preparation equipment or other field seldom directly applying coil as magnetic system, but add magnetic matrix at coil center as magnetic pole type magnetic system, what utilize is that magnetic system is outside, such as electro-magnet, the magnetic field that this kind of magnetic pole type magnetic system produces is strong, but it is big to produce required scope, the uniform low-intensity magnetic field of radial distribution. And singly organize the magnetic field that hot-wire coil produces at coil center, distribution range is wide, has the precondition selected as required magnetic system.
Existing theoretical analysis electromagnetic field, have employed finite element method to design coil magnetic system, shows that single group coil magnetic system exists following three aspect problems by the method research:
The first, the magnetic field utilizing single group coil to produce is too faint; The field gradient change that single group coil produces in hollow part simultaneously is too single, and radial magnetic field intensity size is uneven, constrains equipment enlarging and the application in this field.
2nd, along with magnetic system carrier part (i.e. wear-resisting hollow pipeline) size becomes big, magneticstrength in design pipeline is more big, single group coil is in order to produce enough magneticstrengties with needed for satisfying condition, need a large amount of coils around center material winding, the composition intensive coil of the number of turn, which results in magnetic system radial direction and is taken up space excessive, and not easy heat radiation.
3rd, the duct wall face that is increased in of winding quantity defines high-intensity magnetic field, it is easy to causing magnetic-particle to be assembled in wall face, influencing magnetic particles is separated with non magnetic.
Practical novel content
The technical problems to be solved in the utility model overcomes the deficiency that prior art exists, it is provided that a kind of coil magnetic system producing gradient low-intensity magnetic field.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of coil magnetic system producing gradient low-intensity magnetic field, the some groups of coil assembly comprising hollow pipeline and be set around on described hollow pipeline, some groups of coil assembly along hollow pipeline axially successively interval arrange, each coil assembly is all arranged with multilayer in the radial direction at hollow pipeline, and the number of turn of direction coil assembly along hollow pipeline one end to the other end and the number of plies increase all by group.
Above-mentioned coil magnetic system, it is preferable that, the magneticstrength that described coil magnetic system produces after applying magnetizing current in hollow pipeline is less than or equal to 30KA/m.
Above-mentioned coil magnetic system, it is preferable that, the number of turn ratio of arbitrary neighborhood coil assembly is identical, and described number of turn proportional range is 0.1～1.
Above-mentioned coil magnetic system, it is preferable that, the spacing between adjacent windings group is 0.01～1m; The width of each coil assembly on hollow pipeline axial direction due is 0.01～1m.
Above-mentioned coil magnetic system, it is preferable that, described hollow pipeline is the abrasion-proof pipe being made up of electro-conductive material, and the surface dip-coating of described abrasion-proof pipe is formed with uniform insullac layer.
Above-mentioned coil magnetic system, it is preferable that, adopt non-magnet material to fix between adjacent windings group; Each coil assembly adopts self-binding enamel wire around one-tenth.
Above-mentioned coil magnetic system, it is preferable that, all coils group be connected with power supply and the sense of current consistent.
Above-mentioned coil magnetic system, it is preferable that, all coils group is connected with power supply, and the sense of current of arbitrary neighborhood coil assembly is contrary.
Above-mentioned coil magnetic system, it is preferable that, all coils group is divided into the sub-magnetic system of two or more successively along the axis of hollow pipeline; At least one sub-magnetic system includes coil assembly more than two, and the coil assembly more than two in this sub-magnetic system is connected with power supply, and the sense of current of arbitrary neighborhood coil assembly is contrary.
Above-mentioned coil magnetic system, it is preferable that, all coils group is sequentially connected in series to same power supply, or all coils component is some sub-magnetic systems, and every sub-magnetic system includes one group with upper set of coils, and the coil assembly of each sub-magnetic system connects an independent power supply respectively; All coils group is all curled up around hollow pipeline by same direction, and the initiating terminal that coil assembly is curled up is positioned at the bottom near hollow pipeline outer wall, and the termination end that coil assembly is curled up is positioned at the top layer away from hollow pipeline outer wall.
Compared with prior art, the utility model has the advantage of: the utility model produces the magnetic field that the coil magnetic system of gradient low-intensity magnetic field produces and has following magnetic-field pattern:
(1) along sorting chamber magneticstrength axially, upper weak by force lower, and around magnetic system, form handstand gyro type shape magnetic field atmosphere;
(2) in radial direction, magnetic field distribution is even;
(3) field gradient is similar with a magnetic field force induced rule, and axially first increases and then decreases is zero, finally oppositely sharply increases to maximum value, more sharply reduces, repeated multiple times, forms the sorting atmosphere of " with one climax following another ";
(4) in radial direction, field gradient change is not obvious.
In general, the utility model produces the gradient low-intensity magnetic field that the coil magnetic system assembling of gradient low-intensity magnetic field is simple, can obtain relative high strength, and solves a series of problems that coiling causes more.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of the utility model embodiment coil magnetic system.
Fig. 2 is the partial cutaway TV structure schematic diagram of the utility model embodiment coil magnetic system.
Fig. 3 is the broken line graph of the utility model embodiment coil magnetic system magneticstrength axially surveying and emulate and the distribution of magnetic field power.
Fig. 4 is the broken line graph of the utility model embodiment coil magnetic system radial magnetic field intensity distribution.
Marginal data:
1, hollow pipeline; 2, coil assembly.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, the coil magnetic system of generation gradient low-intensity magnetic field of the present utility model, the some groups of coil assembly 2 comprising hollow pipeline 1 and be closely set around on hollow pipeline 1, some groups of coil assembly 2 along hollow pipeline 1 axially successively interval arrange, each coil assembly 2 is all arranged with multilayer in the radial direction at hollow pipeline 1, and increases all by group along hollow pipeline 1 one end to the number of turn of the direction coil assembly 2 of the other end and the number of plies.This coil magnetic ties up to the magnetic field that can form following several features after applying magnetizing current: one, can produce a handstand gyro type background magnetic field around the hollow cavity and coil assembly 2 of hollow pipeline 1; Two, the field gradient axially produced at the hollow cavity of hollow pipeline 1 changes little, and magnetic field distribution is even; Three, radial magnetic field gradient magnitude first increases and then decreases is zero, finally oppositely sharply increases to maximum value, more sharply reduce, repeated multiple times, forms " with one climax following another " state.
When magnetic-particle and non-magnetic particle are by hollow pipeline 2, the magnetic field of this kind of feature makes magnetic-particle increase progressively direction enrichment to coil turn gradually, and it utilizes selectively magnetic coagulation, it is to increase the rate of recovery of microfine magnetic mineral; Utilize again particle sharply to change axially institute is magnetic field force induced simultaneously, decrease magnetic-particle and gangue particle causes the loss of magnetic-particle because magnetic is mingled with.
In the present embodiment, the magneticstrength that coil magnetic system produces in hollow pipeline 1 inside after applying magnetizing current is less than or equal to 30KA/m.
In the present embodiment, the number of turn ratio of arbitrary neighborhood coil assembly 2 is identical, and number of turn proportional range be 0.1～1. Spacing between adjacent windings group 2 is 0.01～1m; The width of each coil assembly 2 on hollow pipeline 1 axial direction due is 0.01～1m.
In the present embodiment, hollow pipeline 1 is the abrasion-proof pipe being made up of electro-conductive material, and the surface dip-coating of abrasion-proof pipe is formed with uniform insullac layer. Non-magnet material is adopted to fix between adjacent windings group 2; Each coil assembly 2 adopts self-binding enamel wire around one-tenth.
In the present embodiment, each coil assembly 2 can adopt following three kinds of modes to lead to into electric current:
1, all coils group 2 and power supply be connected and the sense of current consistent.
2, all coils group 2 is connected with power supply, and the sense of current of arbitrary neighborhood coil assembly 2 is contrary.
3, all coils group 2 is divided into the sub-magnetic system of two or more successively along the axis of hollow pipeline 1; At least one sub-magnetic system includes coil assembly 2 more than two, and the coil assembly more than two 2 in this sub-magnetic system is connected with power supply, and the sense of current of arbitrary neighborhood coil assembly 2 is contrary.
In the present embodiment, all coils group is sequentially connected in series to same power supply. All coils group 2 is all curled up around hollow pipeline 1 by same direction, and the initiating terminal that coil assembly 2 is curled up is positioned at the bottom near hollow pipeline 1 outer wall, and the termination end that coil assembly 2 is curled up is positioned at the top layer away from hollow pipeline 1 outer wall. In other embodiments, it is possible to all coils group 2 is divided into some sub-magnetic systems, every sub-magnetic system includes one group with upper set of coils 2, and the coil assembly 2 of each sub-magnetic system connects an independent power supply respectively.
The coil magnetic system design, the combination fundamental principle that produce gradient low-intensity magnetic field are as follows: according to Biot-Savart law, and current-carrying coil group 2 at magnetic induction density of axis (by the center of circle and with the straight line of coil assembly 2 plane orthogonal) certain point upper is:
In formula, μ0For permeability of vacuum; R is coil mean radius; X is the distance that on axle, certain puts the center of circle; N is coil turn; I is coil live electric current. (1) determines single group coil group 2 central magnetic field intensity and field gradient scope with the formula.
Design by 10cm of the diameter of hollow pipeline 2, combine, coiling and line and a kind of coil magnetic producing gradient low-intensity magnetic field of becoming is example.
The coil current density formula used during utilization finite element method analysis is:
S=hb (3)
S=Nd2(4)
Coil width is:
(2) are substituted in (1) known:
In formula, J is current density, and N is coil turn, and S is that coil section amasss, and h is the height of coil winding on pipeline, and b is coil thickness, and I is current density, and d is coil diameter.
When other conditions are constant, when using finite element method analysis, coil assembly 2 current density is only relevant with coil assembly 2 size with magnetizing current. In view of condition needed for coil magnetic system, this example selects the enameled wire of 1.2mm as coil method, the highest current-carrying 9A. According to abrasion-proof pipe size, by above-mentioned fundamental principle, find that following coiling can satisfy condition through magnetic parameters.
As depicted in figs. 1 and 2, this example adopts three groups of coil assembly 2, is divided into loop A, coil B and coil C from top to bottom successively, wherein, loop A amounts to 250 circle 9 layers, and coil B amounts to 500 circle 17 layers, coil C amounts to 1000 circle 34 layers, and between coil assembly 2, gap is 18mm.
Connection mode adopts all coils group 2 to be sequentially connected in series the method for power supply, and the sense of current of all coils group 2 is identical, outer even 1.5A magnetizing current, Distribution of Magnetic Field as shown in Figure 3 is created in the axial direction in hollow pipeline 2, in Fig. 3, line 1 represents sorting chamber (inner chamber of hollow pipeline 1) axle medullary ray emulation magnetic field power; Line 2 represents sorting chamber axle medullary ray actual measurement magneticstrength; Line 3 represents sorting chamber axle medullary ray emulation magneticstrength; Line 4 represents sorting chamber axle medullary ray actual measurement magnetic field power; Radial direction creates Distribution of Magnetic Field as shown in Figure 4, in Fig. 4, line 1～5 represent respectively magnetic system section to magnetic field distribution in the radial direction of lower 0.045m, 0.085m, 0.125m, 0.165m, 0.205m different distance.
The above is only preferred implementation of the present utility model, and protection domain of the present utility model is also not only confined to above-described embodiment. For those skilled in the art, do not depart under the utility model technical conceive prerequisite the improvement obtained and conversion also should be considered as protection domain of the present utility model.
Claims (10)
1. one kind produces gradient low-intensity magnetic field coil magnetic system, it is characterized in that: the some groups of coil assembly (2) comprising hollow pipeline (1) and being set around on described hollow pipeline (1), some groups of coil assembly (2) along hollow pipeline (1) axially successively interval arrange, each coil assembly (2) is all arranged with multilayer in the radial direction at hollow pipeline (1), and the number of turn of direction coil assembly (2) along hollow pipeline (1) one end to the other end and the number of plies increase all by group.
2. coil according to claim 1 magnetic system, it is characterised in that: after described coil magnetic system applies magnetizing current, the magneticstrength of generation hollow pipeline (1) in is less than or equal to 30KA/m.
3. coil according to claim 1 magnetic system, it is characterised in that: the number of turn ratio of arbitrary neighborhood coil assembly (2) is identical, and described number of turn proportional range is 0.1～1.
4. coil according to claim 1 magnetic system, it is characterised in that: the spacing between adjacent windings group (2) is 0.01～1m; The width of each coil assembly (2) on hollow pipeline (1) axial direction due is 0.01～1m.
5. coil according to claim 1 magnetic system, it is characterised in that: described hollow pipeline (1) is the abrasion-proof pipe being made up of electro-conductive material, and the surface dip-coating of described abrasion-proof pipe is formed with uniform insullac layer.
6. coil according to claim 1 magnetic system, it is characterised in that: adjacent windings group adopts non-magnet material to fix between (2); Each coil assembly (2) adopts self-binding enamel wire around one-tenth.
7. coil according to any one of claim 1 to 6 magnetic system, it is characterised in that: all coils group (2) be connected with power supply and the sense of current consistent.
8. coil according to any one of claim 1 to 6 magnetic system, it is characterised in that: all coils group (2) is connected with power supply, and the sense of current of arbitrary neighborhood coil assembly (2) is contrary.
9. coil according to any one of claim 1 to 6 magnetic system, it is characterised in that: all coils group (2) is divided into the sub-magnetic system of two or more successively along the axis of hollow pipeline (1); At least one sub-magnetic system includes coil assembly more than two (2), and the coil assembly more than two (2) in this sub-magnetic system is connected with power supply, and the sense of current of arbitrary neighborhood coil assembly (2) is contrary.
10. coil according to any one of claim 1 to 6 magnetic system, it is characterized in that: all coils group (2) is sequentially connected in series to same power supply, or all coils group (2) is divided into some sub-magnetic systems, every sub-magnetic system includes one group with upper set of coils (2), and the coil assembly (2) of each sub-magnetic system connects an independent power supply respectively; All coils group (2) is all curled up around hollow pipeline (1) by same direction, and the initiating terminal that coil assembly (2) is curled up is positioned at the bottom near hollow pipeline (1) outer wall, the termination end that coil assembly (2) is curled up is positioned at the top layer away from hollow pipeline (1) outer wall.
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| CN201521018298.5U CN205308566U (en) | 2015-12-09 | 2015-12-09 | Produce coil magnetism system of gradient low -intensity magnetic field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105381876A (en) * | 2015-12-09 | 2016-03-09 | 长沙矿冶研究院有限责任公司 | Coil magnetic system capable of generating gradient weak magnetic field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105381876A (en) * | 2015-12-09 | 2016-03-09 | 长沙矿冶研究院有限责任公司 | Coil magnetic system capable of generating gradient weak magnetic field |
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