CN1035252A - As separating or filtering magnetic device - Google Patents

Abstract

Magnetic separates or filtration unit, this device has been used the electromagnetic induction principle of alternating magnetic field, make the filter line loop produce electric current, utilized simultaneously and exchanged the background magnetic field magnetic force that formed High-gradient Magnetic place produces around magnetic filter line and filter the electric current magnetic force that formed gradient magnetic produced around it in the line loop, and make this two power additions, thereby strengthened the isolating effect of magnetic.Owing in certain regional mutual superposition or counteracting and vibration, can get the very high isolate of grade to these two power of magnetic particle of different nature.The filter line of this device has heating and these two characteristics of discharging simultaneously, utilizes these characteristics of heating it can be made electric water heater.Because of this installs without direct supply, reliability is improved, cost reduces.

Description

As separating or filtering magnetic device

Patent of the present invention belongs to a kind of separation (or filtration) device.

The magnetic separation starts from the U.S., 1936 Fo Lanzi (Frantz) invented " isolating method of magnetic and means " (United States Patent (USP) 2056425), follow (nineteen thirty-seven) invention " magnetic separator " (United States Patent (USP) 2074085), this technology is widely used in mining industry, also be applied to the metallic impurity sorting, fields such as the processing of industrial waste.Propose High-gradient Magnetic in 1971 up to bur (Kolm) and separate (United States Patent (USP) 3; 567; 026 or 1971 Conf.on Magnetism and Magnetics Materials; Am.Inst.of Physics; Conference Proceeding No.5) just broken narrow range of application since magnetic separates invention; make magnetic be separated in environment protection; mineral are refining; the application in fields such as rare metal exploitation and recovery and biomedical engineering has obtained progress at full speed, and this century, research boom once worldwide appearred in the seventies.Magnetic separation technique never obtains breakthrough from then on.But many people have made a large amount of new explorations to magnetic separation technique.Parker (Parker) (IEEE Trans.on Magnetics, Vol.MAG-19, No.5, Sept.1983) studied a lead that passes to galvanic current around formed field gradient to the reactive force of particle and the filtration unit that makes with this principle, simultaneously, Gourde(G) clarke (Goodluck) has illustrated that in " magnetic in the alternating-current field separates " (IEEE Trans.on Magnetics Vol.MAG-23, No.3 May 1987 p1909) literary composition the high-gradient magnetic field of alternating magnetic field formation around the filter line also can produce the unidirectional magnetism to particle.But do not consider when the filter line constitutes the loop, alternating magnetic field in the filter line induced electric current to the influence of magnetic separating effect.

The present invention has adopted a structure cleverly, utilizes the principle of induction of alternating magnetic field, the power that the gradient magnetic that power that the high-gradient magnetic field that has utilized the magnetic fine rule to be produced under the background magnetic field effect simultaneously produces and fine rule are produced under the energising situation produces.Its ultimate principle is at a mid-electroconductive magnetic wire loop of alternating magnetic field, at first, as a kind of magnetic conduction fine rule, can form high-gradient magnetic field around it; Secondly, as a kind of galvanic circle, can produce induced potential and form electric current, thereby form current gradient magnetic field.

What this was mentioned especially is United States Patent (USP) 3,567,026, this patents state such magnetic device, feed galvanic current in a coil, this electric current produces a background magnetic field, puts into some etch-proof magnetic filter lines in this magnetic field, around it, produce high-gradient magnetic field, thereby magnetic particle is produced big magnetic force.This device also is added with one and exchanges vibrator coil and an AC demagnetization coil, so that retentate is fallen in easier recoil.

The purpose of this invention is to provide one big to paramagnetic particle or ferromagnetic particle or conducting particles magnetic adsorbability, can obtain than the existing magnetic separator magnetic separating device of higher-grade isolate more.

Another object of the present invention provides an electric heater unit that possesses magnetization, filtering function.

The action principle of this patent is discussed below:

Background magnetic field

Clear easy for what analyze, make the equivalent-circuit diagram of high-gradient induced magnetism separator, as figure three.The reference direction of end of the same name and each amount is understood in the figure acceptance of the bid.

If the electric current in the coil

i＝I _mSinωt （1）

Its plural form

（2）

(1) ω is a supply frequency in the formula.

If the number of turn of coil is W, total field ampere-turns of coil is Wi, and the magnetic permeability of supposing ferromagnetic substance is for infinitely great, and then the magnetic pressure on yoke and the magnetic pole reduces to zero, and the magnetic resistance of air gap is (ignoring the magnetic conduction effect of filtering line) in the magnetic circuit:

R _ma＝ (L)/(μ·S) （3）

The very aerial magnetic permeability of μ .-in the formula.

The length of L-air gap.

The cross-sectional area of S-air gap.

So, the total magnetic flux that coil produces:

φ= (Wi)/(R _ma) = (μ·s)/(L) wi （4）

Can obtain background magnetic field:

B＝ (φ)/(S) ＝ (μ.)/(L) WI _mSinωt （5）

Plural form:

（6）

Background magnetic field intensity

H= (WI _m)/(L) Sinωt（7）

（8）

Background magnetic field is to the magnetic force of particle

The field gradient that can obtain background magnetic field this moment and form around the filter line is to power F that magnetic particle produced _Mb. by the force bearing formulae of particle in magnetic field:

F _m= 1/2 μ·X _PV _P

=μ·X _PV _PH

H（9）

In the formula: X _pThe susceptibility of-particle.

V _pThe volume of-particle.

Because captive particle is nearer apart from the filter line, can think that filter curvature of a curve radius is very big, and be approximately the straight line of an endless, according to (9) formula, can draw the magnetic force formula for (coordinate (and γ, θ) and true origin shown in figure four):

F _mrb=- (X _PV _pMa ²)/(r ³) (Ma ²/2μ·r ²+HCOS2θ) （10）

F _mθb=- (X _PV _pMa ²)/(r ³) HSin2θ)（11）

In the formula: M=(μ-μ .)/(μ+μ .) 2 μ H (12)

The magnetic permeability of μ-filter line.

The radius of a-filter line.

Electric current in the filter line loop

Filter bed is made up of a lot of filter line loops, all influences each other by mutual inductance between them, in order to take into account this factor, and can list mathematic(al) representation easily, only considers two influence each other (figure seven) that filter line loops.

The induced potential eb1 of background magnetic field in filter line loop f1:

e _b1=- (dψ _b1)/(dt) =-B _mS ₁ωCOSωt（13）

In the formula: S ₁For filter line loop f1 to the shadow area of vertical of field direction.

By (5) formula B as can be known _m=(μ .)/(L) WI _m,

e _b1=- (μ·S ₁)/(L) =WI _mωCOSωt（14）

Write pluralize:

Therefore filter the mutual inductance between line loop f1 and the coil

$M_{\mathrm{c1}}=\frac{\sqrt{2}{\mathrm{\mu \; ·S}}_{1}W}{L}\mathrm{(16)}$

So,

(17)

In like manner, at filter line loop f ₂In the induced potential E of (as figure two) _B2For:

(18)

In the formula:

${\mathrm{<figure-callout\; id="2"\; label="M\; c"\; filenames="881058890\_DRIMG2.png,881058890\_DRIMG5.png"\; state="\{\{state\}\}">M</figure-callout>}}_c=\frac{\sqrt{2}{\mathrm{\mu \; ·S}}_{2}W}{L}\mathrm{(19)}$

M _C2Be filter line loop f ₂Mutual inductance with coil.

S ₂Be filter line loop f ₂Area to the projection of magnetic field vertical surface.

If filter line loop f ₁And f ₂Between mutual inductance be M, then:

Filter line loop f ₂At f ₁In the mutual inductance electromotive force

Filter line loop f ₁At f ₂In the mutual inductance electromotive force

(21)

The self-induction of filter line loop is respectively L1, L2, and the self-induced e.m.f during two filters encircle is respectively:

Two electric potential balancing equations of filtering in the line loop write out as follows:

The filter line loop

The filter line loop

Substitution electromotive force expression formula (17), (18), (20), (21), (22), (23), formula (24), (25) become:

Definition: filter line loop f ₁Self-impedance Z ₁=R ₁+ j ω L ₁(28)

Filter line loop f ₂Self-impedance Z ₂=R ₂+ j ω L ₂(29)

Get by (26)～(29) formula:

Coil to the transfer voltage of filter line loop is:

Y ₁＝－ (jωM _ciZ ₂+ω ²M _c1M)/(Z ₁Z ₂+ω ²M ²) (32）

Y ₂＝－ (jωM _c2Z ₁+ω ²M _c2M)/(Z ₁Z ₂+ω ²M ²) （33）

Transfer voltage Y ₁Amplitude determined filter line loop f ₁In electric current to the gain of electric current in the coil, its argument (is used θ _cExpression), represented filter line loop f ₁Electric current and the phase differential of coil current, the just phase angle difference in their corresponding magnetic field.θ _cThe angle is the key of the gradient magnetic and the gradient magnetic overlaying relation that background magnetic field produces of the generation of filter circular current.Work as R ₁＜＜ω L ₁, R ₂＜＜ω L ₂The time, θ _cApproach-π, they will reach maximum simultaneously, but phase place is opposite.Work as R ₁＞＞ω L ₁, R ₂＞＞ω L ₂The time, θ _cApproach-(π)/2.They are when reaching maximum for one, and just in time another reaches minimum.It was zero (promptly ignoring influencing each other between the filter line loop, because this influence is very little) that these two conclusions can make the M in the formula (32), with seasonal R ₁(or R ₂) all be zero or be tending towards infinity and obtain.So the size and the proportionlity of filter line loop resistance and reactance have great effect to high-gradient induced magnetism tripping device.

The magnetic field that electric current in the filter line loop produces is to the reactive force of particle

According to Ampere circuit law:

∮H _i1dl＝i （34）

Under the bigger situation of filter line loop radius-of-curvature, can be similar to and think that filtering the formed magnetic field of line loop electric current around the filter line is uniformly, consider a circular loop around the filter line, (34) formula integration gets:

H _i1= (r ₁)/(2πr) (35）

Field gradients around the filter line is:

Going into magnetic force formula (9) for formula (35) (36) (37) becomes:

=-μ·x _pv _p( (i ₁)/(2π) ) ²1/(r ³) （38）

F _Mθil＝0 （39）

Subscript il in formula (34)-(39) represents to filter line loop f ₁The caused amount of electric current.

By formula (30) and (32), the magnetic force that current i l produces

F _mril=-μ·x _pv _p( (｜Y ₁｜I _mSin(ωt+θ _c))/(2π) ) ²1/(r ³) （40）

Going into (40) formula for (8) formula gets:

F _mril=-μ·x _pv _p( (｜Y ₁｜LH _mSin(ωt+θ _c))/(2πw) ) ²1/(r ³) （41）

Act on the total magnetic force on the particle

The susceptibility of hypothetical particle is a constant, does not promptly change with the field amount, therefore available superposition theorem.Total magnetic force is the magnetic force and the magnetic field of filtering line current generation magnetic force sum to particle of background magnetic field to particle, and formula is as follows:

F _mr＝F _mrb+F _mril（42）

F _mθ＝F _mθb+F _mθil（43）

Formula (38) (39) and formula (10) (11) substitution (42) (43) are got:

F _mr=- (x _pv _pMa ²)/(r ³) ( (Ma ²)/(2μ·r ²) +HCOS2θ)

-μ·x _pv _p( (｜Y ₁｜I _mSin(ωt+θ _c))/(2π) ) ²1/(r ³) （44）

F _mθ=- (x _pv _pMa ²)/(r ³) HSin2θ（45）

(44) can be found out thus, and the magnetic force of filter line charmed particle is two sums, thereby has strengthened the isolating effect of magnetic.Be following convenience, above-mentioned principle is called high-gradient induced magnetism separation principle.

The physical significance of high-gradient induced magnetism separation principle

Shown in figure five, a magnetic particle is among the alternation background magnetic field, and according to Faraday's explanation, the surface tension of particle equals 1/2 HB.Now examine or check A ', B ' point, its A ' surface tension is 1/2 H _{A '}B _{A '}, B ' some surface tension is 1/2 H _{B '}B _{B '}Obviously, when field direction changes, 2 H of A ', B ' and B change simultaneously, therefore the capillary direction of 2 of A ', B ' can not change, and will depend on particle suffered capillary making a concerted effort so particle institute is stressed, and this is with joint efforts with relevant with magnetic field gradient directions, opposite to paramagnetic, the suffered magnetic force of ferromagnetic substance particle with the gradient direction of the mould of magneticstrength, consistent to anti-magnetic particle with gradient direction.In like manner soluble filter line current gradient magnetic is to magnetic force that particle produced.

Can find out also that from formula (44) and (45) particle will be subjected to unidirectional magnetic force, because power becomes quadratic relationship respectively with electric current, magnetic field.

The selection at θ c angle

Consider to absorb two field-background magnetic fields (as figure five) of magnetic particle and the magnetic field that the filter line current produces around the filter line.Background magnetic field has different repulsions or suction zone to suitable, anti-magnetic particle around the filter line.As figure five, be suction zone to paramagnetic or ferromagnetic particle A, C district, B, D district are rejection area.Just in time opposite to anti-magnetic particle, A, C district are rejection area, and B, D district are suction zone.The magnetic field that the filter line current produces always attracts paramagnetic or ferromagnetic particle, and anti-magnetic particle is always repelled.

When generally separating paramagnetic (or ferromagnetic) particles mixture, should make when a magnetic field reaches maximum, zero (being θ c=-(π)/2) approached in another magnetic field as far as possible.When separating diamagnetic substance and paramagnetic (or ferromagnetic) particles mixture, should adopt the absolute value of two magnetic field amplitude to reach maximum (being θ c=-π) simultaneously.This be because, when separating paramagnetic particle or ferromagnetic particle mixture, require magnetic particle is attracted best constant, when background magnetic field reduced, the magnetic field that the filter line current produces should increase.When separating anti-magnetic particle and paramagnetic (or ferromagnetic) particle, be not attracted on the filter line for making anti-magnetic particle, the magnetism (area B or D) and the filter line current generation repulsive force that magnetic field produced that should make background magnetic field as far as possible and produced occur simultaneously.Therefore, the present invention is specially adapted to separate the mixture of paramagnetic particle and anti-magnetic particle, be other principle magnetism separate method can not compare.

The filter line loop

By the analysis of top ultimate principle, the reactance of filter line loop and the matching relationship of resistance and size cause isolating effect closes mainly.General select conduction and magnetic property all preferably material filter line loop.Also can adopt composite structure, example copper coating on the magnetic conduction steel wool, and the method for bag magnetically permeable material is regulated the matching relationship of its resistance and reactance on copper cash.The reactance of the preceding a kind of method a kind of method in back is little.When frequency was higher, a kind of method surface action in back was more obvious.The outermost layer of filter line loop can be coated with insulation Wealthy.A lot of filter line loops constitute filter bed.

Frequencies omega

Supply frequency ω is a very important amount, and it has material impact to the filter resistance of line loop and the matching relationship of reactance, and faradic size and frequency are closely related, and the high more inductive effects of frequency is strong more.

The heating of filter line

The heating of filter line is the isolating distinguishing feature of high-gradient induced magnetism, can utilize these characteristics that processed liquid is heated.An interior heat that is produced of filter line loop unit time is:

Q＝R ₁I ² ₁＝R ₁｜Y ₁｜ ²I ²（46）

Discharge between the filter line loop

If do not couple together between the filter line loop by good conductor, touch connection but be abutted against, this junction just has electric discharge phenomena and produces when loose contact.This is because it is the electromagnetic process of a complexity that the high-gradient induced magnetism separates, and just may form pressure reduction at the point of contact place between the adjacent filter line loop, thereby produces electric discharge phenomena.If need kill the germ in the processed liquid, just should be used, otherwise should fight off, as long as will filter the line finish coatings this moment.

An object of the present invention is to provide as previously mentioned one big to paramagnetic particle or ferromagnetic particle or conducting particles magnetic adsorbability, can obtain than the existing magnetic separator magnetic separating device of higher-grade isolate more.At this moment, the present invention-as separating or filtering magnetic device, it is cylinder mode and C type structure that following two kinds of structures are arranged:

Cylinder mode

It is made up of yoke (1), magnetic pole (2), filter line loop (3), coil (4), filtering chamber (5), coil (4) is on filtering chamber (5), filter line loop (3) is arranged in filtering chamber (5), yoke (1) surrounds coil (4), and the both sides of filter line loop (3) are blocked with magnetic pole (2).

C type structure

It is made up of yoke (1), magnetic pole (2), filter line loop (3), coil (4), filtering chamber (5), and coil (4) is placed filtering chamber between two magnetic poles (2) on yoke (1), and its filter line loop places filtering chamber.

Coil (4) provides a background magnetic field and the required electric current of filter line loop.The filter line is used for filtering single line or rod exactly, and so-called filter line loop is meant that it mainly plays heating and trapped particle by the filter closed path that line constituted, the passage of filtering chamber (5) formation object being treated.In order to improve background magnetic field, preferably add the magnetic circuit that constitutes by magnetic pole and yoke, magnetic circuit is made up of ferromagnetic laminates, and its lamination direction should be consistent with field direction, and C type structure lamination is more or less freely.The roll type directly rolled up is arranged the drum type brake lamination and along the radial pattern lamination that circumferentially laminates, lamination is the radial pattern lamination shown in figure six, and often adopts straight line or involute urve to stretch out.

The advantage of cylinder mode is compact, and leakage field is little, is suitable for industrial application.

The advantage of C type structure is the capture rate height, and simple in structure, lamination is easy, be convenient to observe, but leakage field is bigger, is suitable for testing laboratory and industrial application.

Use the isolating magnetic separating device of high-gradient induced magnetism and have tangible advantage:

(1) under same background magnetic field, particle is subjected to the magnetism of the action of a magnetic field to separate big than traditional High-gradient Magnetic.

(2) because background magnetic field has suction zone to anti-magnetic particle around the filter ring, it is unfavorable to upgrading that traditional High-gradient Magnetic is separated, repel anti-magnetic particle all the time because of it in the magnetic field that induced current produces, favourable to upgrading.

(3) make filter line loop vibration by background magnetic field and faradic reactive force, the non-magnetic force of filter line loop is caught, and (for example mechanical entrapment etc.) reduces, and can obviously upgrade.

(4) this device directly is connected on the AC power, does not need rectifier power source and rectifier transformer, makes cost low, and reliability improves, thereby system efficiency is improved.

The separation of high-gradient induced magnetism has following shortcoming:

(1) because vibration has noise to produce.

(2) owing to use AC power to bring the surface action of core loss and conductor, the device heating increases.

(3) lamination technology is complicated.

High-gradient induced magnetism separation simultaneously has following characteristics:

(1) heating of filter line.

(2) the mutual discharge between unconnected filter line loop.

These two characteristics should be used in some application scenario, and some occasion should fight off or reduce as far as possible its effect.

Another object of the present invention provides a kind of electric water heater that possesses magnetization, filtering function as previously mentioned.At this moment, the present invention-, form by magnetic circuit (1), magnetic conduction baffle plate (2), filter line (3), coil (4), filtering chamber (5), insulating mat (6), end cap joint (7), seal washer (8), shell institutes such as (9) as separating or filtering magnetic device.Shown in accompanying drawing eight, coil (4) is around on the filtering chamber (5), for insulation better, can add one deck insulation spacer (6) between coil (4) and filtering chamber (5).Filter line (3) places among the filtering chamber (5), and two ends are blocked with magnetic conduction baffle plate (2).Magnetic circuit (1) is enclosed in coil (4) outside and is supported by filtering chamber (5), adds an end cap (7) in filtering chamber (5) top simultaneously, has attacked the spiral shell mosquito on it so that connect.Shell (9) is added on outside the magnetic circuit (1) and supports with filtering chamber (5), and shell also can the double as magnetic circuit.Between end cap joint (7) and filtering chamber (5), add upper sealing washer (8) to prevent that hot water spills in the filtering chamber (5).

Because the heating of coil may make thermo-efficiency reduce, and in order to reduce cost, raises the efficiency, coil preferably adopts water-cooled, and water outlet is fed filtering chamber heats, and the type of cooling has internal water cooling and adds the cooling tube dual mode.In order to prevent external heat radiation, inner surface of outer cover is preferably adorned a layer lagging material.

It is the key part that filters and add hot water that the present invention carries the filter line, when as electric water heater, filter line of the present invention should be made broad understanding, more totally and not needing magnetized occasion filter line at water-quality ratio can be the metallic object of arbitrary shape, as long as can produce a large amount of heat, should utilize eddy current this moment as far as possible.

The also open report of existing document has various water-heater.As Chinese patent 8520 II 32 disclosed water-heaters, be that the electrode that utilization is embedded in the water is that heating element heats with water.When this water-heater used, the electrode in the water can corrode because of electrolysis, and the life-span is short, and used in the bad place of some water quality, and also may produce some objectionable impuritiess influences HUMAN HEALTH.As imperfect earth, water is with charged and bring safety problem, and function singleness, only water can be heated.And the electric water heater of selling on a lot of existing markets, as be embedded in the electric water heater that the nichrome wire in the water heats, and because nichrome wire is easy to damage, insulation inconvenience processing has the life-span short, safety performance is low, shortcomings such as function singleness.The heat storage type water-heater uses inconvenience, can not obtain hot water very soon, and cold and hot adjusting is inconvenience also, and the hot water service amount is limited.

The electric water heater that utilizes high-gradient induced magnetism separation principle to make needing originally to have realized electric heater, strainer, three of water mangetizers to install the function that could realize simultaneously, on operation operation and cost treatment effect, all is better than existing these three devices.Because of the general magnetic filter of energy force rate of granule for absorbing of the present invention is strong, and the bacterium that will adsorb kills under the high temperature of filter line.Experiment showed, that it almost can remove germs such as all intestinal bacteria in the water, bacillus, and filter out the most of objectionable impurities in the water, make underproof tap water reach national meal water supply standard.The present invention is as electric water heater, and water power is isolated fully, has stopped the charged problem that jeopardizes personnel safety of water, and it has abandoned the nichrome wire that easy oxidation is blown, and the life-span is greatly increased.

The invention will be further described below in conjunction with accompanying drawing:

Figure one, figure two are structural representation of the present invention, (separation magnetic device), wherein (1) is yoke, and (2) are magnetic pole, and (3) are the filter line loop, and (4) are coil, (5) are filtering chamber.

Principle-high-gradient induced magnetism separation principle equivalent-circuit diagram that figure three uses for the present invention.

Dirt when figure four filters the line trapped particle for the present invention is marked on a map, and wherein (3) are the filter line, and (11) are magnetic particle.

Figure five filters line Distribution of Magnetic Field figure on every side for the present invention, and wherein (3) are the filter line, and (11) are magnetic particle, and (12) are magnetic line of force.

Figure six is cylinder mode magnetic circuit lamination mode synoptic diagram of the present invention.

Figure seven is the interact principle schematic of electric current of coil of the present invention, filter line, and wherein (4) be coil, and (3) for filtering line loop, (12) are magnetic line of force.

Figure eight is structural representation of the present invention (an electrically heated magnetic device), wherein (1) is magnetic circuit, (2) be the magnetic conduction baffle plate, (3) are the filter line, and (4) are coil, (5) be filtering chamber, (6) be insulating mat, (7) are the end cap joint, and (8) are seal washer, (9) be shell, (10) are water cooled coil.

Claims (10)

1, a kind of magnetic separation (or filtration) device that is used for separating (or filtration) particulate, and formed by coil (4), filter line (3), filtering chamber (5), feature of the present invention is that the filter line constitutes the loop, in coil, feed alternating current, make the filter line loop produce induced current, coil current will produce a background magnetic field this moment, this magnetic field forms high-gradient magnetic field around magnetic filter line, filter line current simultaneously and around the filter line, will form a kind of gradient magnetic, these two magnetic fields all can produce power to particulate, and formulae express is:

F _mr=- (X _PV _PMa ²)/(r ³) (Ma ²/2μ·r ²+HCOS2θ)

-μ·x _pv _p( (｜Y ₁｜I _msin(ωt+θ _c))/(2π) ) ²1/(r ³)

F _mθ=- (X _pV _pMa ²)/(r ³) HSin2θ

2, separate (or filtration) device according to the described magnetic of claim 1, it is characterized in that the cylinder mode (as figure one) that adopts the coil outside that iron circuit is arranged, its coil is on filtering chamber, and the filter line is arranged in filtering chamber.

3, separate (or filtration) device according to the described magnetic of claim 1, it is characterized in that adopting the C type structure (as figure two) of coil on the iron circuit, its filtering chamber is between two magnetic poles, and the filter line is positioned among the filtering chamber.

4, separate (or filtration) device according to the described magnetic of claim 1, it is characterized in that filtering not only high conduction of line but also high magnetic conduction, implementation method:

A, filter line adopt the method for the high conducting material of high magnetic conduction;

B, filter line adopt copper facing outside ferromagnetic wires, silver-colored method;

C, filter line adopt the method at copper cash outsourcing (or plating) ferromagnetic material.

5,, it is characterized in that the lamination of ferromagnetic magnetic circuit part adopts the radial pattern lamination according to the described drum type brake magnetic separating device of claim 2.

6, a kind of electric water heater is characterized in that being made up of coil (4), filter line (3), filtering chamber (5).

7, according to the described electric water heater of claim 6, it is characterized in that filtering line and constitute the loop, in coil, feed alternating current, make the filter line produce induced current, coil current will produce a background magnetic field this moment, this magnetic field forms high-gradient around magnetic filter line, the induced electric current will form a kind of gradient magnetic and make and filter the line heating and make the water heating around the filter line simultaneously, the gradient magnetic that background magnetic field and induced current form around magnetic filter line all can produce power to particulate, thereby the suspended particles in the water are adsorbed on the filter line, and to the water generates magnetization.

8, according to claim 6 or the described electric water heater of claim 7, it is characterized in that adding a ferromagnetic magnetic circuit in the coil outside, the lamination of ferromagnetic magnetic circuit adopts the radial pattern structure.

9,, it is characterized in that the shell inner face has the thermal insulation material of one deck insulation according to the described electric water heater of claim 8.

10, according to the described electric water heater of claim 9, it is characterized in that coil adopts water-cooling structure, cold-peace adds the cooling tube dual mode in the useful hollow core conductor coil of the type of cooling.And with cooled water feeding conduit.

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