A kind of industrial electromagnetic heating process and device and purposes
Technical field
The invention belongs to a kind of electromagnetic heating method and device, especially a kind of electromagnetic heating method and device that is applied to industry.The invention still further relates to the application of preceding method and device, be mainly used in plastics (rubber) forming machine, on the pipeline that crude oil, heavy oil are carried, and other industry heating place.
Background technology
In industrial production, need heat material in the time of many.The general industry mode of heating has two kinds now, and a kind of is to utilize the heating of fuel thing, and another kind is to utilize the electric energy heating.Along with industrial expansion and progress, utilize the industrial and mineral place of electric energy heating more and more, directly utilize the electrothermal device heating but utilize the electric energy heating to be still mostly now, and then heat by heat conducting mode.Mode of heating as plastic processing machinery utilizes the electric heating coil heating exactly, is transmitted on the barrel again.There is heat conduction loss in this mode of heating, and causes ambient temperature to rise.The heat that only abuts against barrel surface inner ring is transmitted on the barrel, and the heat major part of outer ring is lost in the air, causes the loss of heat.At present, rising a kind of Electric heating of utilizing electromagnetic induction now.The electromagnetism heating is a kind of method of utilizing electromagnetic induction principle to convert electrical energy into heat energy, the electromagnetism heating normally becomes alternating voltage into direct voltage by rectification circuit, convert direct voltage to high frequency voltage through control circuit again, the electric current that changes flows through the magnetic field that coil can produce the high speed variation at a high speed, in passing through metalware (magnetic conduction is electric conducting material again) bottom metal body, the magnetic line of force in the magnetic field produces countless little eddy current, make metalware heating at a high speed voluntarily itself, and then the thing in the heating vessel.Therefore the electromagnetism heating collar itself does not generate heat, and can adopt ceramic material and high-temperature cable manufacturing, so the resistance wire that does not have a former electric heating coil oxidation and problem of reduction of service life under the condition of high temperature, have long service life, heating rate fast, advantage such as need not keep in repair, reduce maintenance time, reduced cost.Now household electrical appliance use more, as electromagnetic oven etc.Is the new technology of just rising in recent years with the electromagnetism heating in industrial application, though electromagnetic induction heating technology is used to some extent at certain industrial circle at present, be called " electromagnetic induction heating circle " as name, the patent No. is that the Chinese patent of ZL03248743.6 discloses a kind of industrial electromagnetic induction heating technique.But the electromagnetism heating collar of existing industrial electromagnetic induction heating technique substantially all is the structure that adopts individual layer plane or arcuation, adopt full circle to surround the formula winding structure having aspect the metallic conduit heating, the electromagnetic induction heating coil structures that adopts semicircle or the coiling of arcuation plane individual layer is also arranged.Though these electromagnetism mode of heatings, have energy-conservation good, advantage that the heat efficiency is high corresponding to the direct mode of heating of the resistance wire of routine, also have following some shortcomings simultaneously:
One, surrounds the tubulose heater coil of coiling for full circle
1, in actual applications, the mounting distance requirement 〉=50mm of two coils, otherwise can produce stronger magnetic interference between the coil, influence the operate as normal of electromagnetic controller.
2, be not suitable for the bigger firing equipment of pipe diameter, because under the prerequisite of the inductance value that keeps being fit to, the wire circle of the too big institute of diameter coiling must reduce, the heat efficiency reduces.
3, some pipeline is longer, in the middle of some pipeline flange or die head is arranged, and circular electromagnetic induction heating circle can't be installed and used.
Two, for the electromagnetic induction heating circle of semicircle or arcuation plane individual layer coiling
1, the inductance value of unit are is on the low side, only is applicable to the equipment of small-power heating.
2, coil and the spacing that is heated hardware require greatlyyer, and the heat efficiency is lower, and energy-saving effect is not fine.
More than the common deficiency that exists of electromagnetic induction heating circle of two kinds of structures be that unit are heating power density is little, the big equipment of heating power density is inapplicable for needing, and has limited their extensive use.Therefore necessary this is improved.
Summary of the invention
The objective of the invention is to: at the deficiency of existing industrial electro heating means, it is big to propose a kind of unit are heating power density, and the heat efficiency is higher, and good in anti-interference performance is installed easy to makely, can adapt to the electromagnetic-induction heating method of various industrial and minerals place application;
Another object of the present invention is to provide a kind of device of said method;
Another object of the present invention is to provide the purposes of a kind of said method and device.
The objective of the invention is to be achieved through the following technical solutions: adopt electromagnetic-induction heating method, it is characterized in that, described electromagnetic-induction heating method is to be attached to by the electromagnetic induction heating coil plane of multilayer stack or arcuation to be heated metalware or pipeline appearance, comes material in heating of metal vessel or the pipeline by direct heating of metal vessel of electromagnetic induction or pipeline.The composite laminate electromagnetic induction heating coil that is superposeed and formed by two-layer above solenoid is installed outside the metalware of need heating load or pipeline (magnetic conduction is electric conducting material again), the profile of composite laminate electromagnetic induction heating coil is the shape that the profile according to institute's heating of metal vessel or pipeline matches, can be plane or arcuation or semicircular, after the composite laminate electromagnetic induction heating coil is first snail coiling, multilayer build-up gets up again, and according to the profile moulding of institute's heating of metal vessel or pipeline, magnetic line of force superposition after the stack of each layer electromagnetism heating collar is on the metalware or pipeline of need heating load, can connect by polyphone between each layer electromagnetism heating collar, adopt a lead coiling; Also can adopt and be connected in parallel.Whole composite laminate electromagnetic induction heating coil heating is by rectification circuit external AC to be pressed to become direct voltage, converting direct voltage to frequency through control circuit again is high frequency voltage, high frequency voltage is applied on the composite laminate electromagnetic induction heating coil again, flow through the composite laminate electromagnetic induction heating coil by the electric current that changes at a high speed and produce the magnetic field that changes at a high speed, when the magnetic line of force in the magnetic field passes through metalware or pipeline (magnetic conduction is electric conducting material again), will in metallic object, produce countless little eddy current, make metalware or pipeline at a high speed heating voluntarily itself, utilize material in electromagnetic induction method heating of metal vessel or the pipeline.
Structure according to the industrial composite laminate electromagnetic induction heating coil that said method proposed is: a kind of electromagnetic induction heating circle, described electromagnetic induction heating circle is the composite laminate electromagnetic induction heating coil, the coil of being made by the coiling of individual layer plane is overlapped into sandwich structure, and the magnetic line of force direction after every layer of electromagnetic induction heating circle is superimposed is identical, inductance value superposes, can be to connect between every layer of electromagnetic induction heating circle by polyphone, adopt a lead coiling, the entrance and exit of every layer line circle just in time joins, before not superimposed during flat state, the coil direction of rotation of coil is opposite between every adjacent two layers, but the magnetic line of force direction after superimposed should be identical; Also can adopt to be connected in parallel, directly every layer entrance and exit unification is connected on the bus.The composite laminate electromagnetic induction heating coil can be whenever two-layer one group, constitute double-decker electromagnetic induction heating circle, the mode of connection that coil adopts end of the same name to link to each other, the direction of winding of coil can be anti-phase before coil is not superimposed, but the magnetic line of force direction after superimposed should be in the same way, and the inductance value of composite laminate electromagnetic induction heating coil superposes.The global shape of composite laminate electromagnetic induction heating coil can be made into complementary shaped according to the profile variation of the metalware of heating load or pipeline, can be plane, it also can be arc shape or semicircular, the single layer coil that elder generation is made by the plane coiling, be superimposed together, the profile according to metalware or pipeline is shaped to the shape that matches again again.The composite laminate electromagnetic induction heating coil is placed in after shaping in the sheath that is made of insulating material, is closed by sheath.
Invention main application according to said method and device is: the oil product heating that the raw material heating of plastics or rubber-moulding machinery or petroleum pipeline are carried industry also can be used for other pipeline or dull and stereotyped heating industry.
The present invention adopts the composite laminate electromagnetic induction heating coil of multilayer overlaying structure, and make the magnetic line of force of each layer line circle be unidirectional stack in superimposed back, can strengthen the inductance value of electromagnetic induction heating circle so greatly, mutual inductance between the inductance value of its total inductance value=each layer line circle+each layer line circle, so the inductance value of two-layer coil is 2.2-2.6 a times of single layer coil.Its magnetic line of force as shown in Figure 3, the direction of establishing a certain immediate current I is as figure, according to right-hand screw rule, then the magnetic line of force direction of coil one is that centre by coil 1 enters (X), is come out (●) to form closed magnetic circuit by the outside of coil one.And the magnetic line of force direction of coil 2 come out in the middle of being (●), the outside enters (X).When coil 2 being turned over turnback and coil 1 when being close together, its magnetic line of force direction just in time is identical.This point can find out from Fig. 3 translation schematic diagram that also Fig. 3 is the schematic diagram of composite electromagnetic coil after parallel removing on the same horizontal plane that two are superimposed together.Because the magnetic line of force direction of two coils is identical, magnetic field intensity equates that its magnetic field intensity has increased about one times behind the then synthetic coil.So just increased the heating power density of unit are, and range of application is wider, energy-saving effect is better.Advantage of the present invention is:
1, because what adopt is the plane arcuate structure, and the magnetic line of force major part that electromagnetic induction coil produces affacts on the metallic conduit, so circularly before its thermal efficiency ratio want high 5%-10%.
2, because the magnetic line of force acts on the coil side seldom, so the interference between two coils is very little, can be close together is installed on the metallic conduit, has improved heating power density, and the scope of application is wider.
3, can place the induction loop of a plurality of planes arc shape owing on the external diameter of metallic conduit, so be applicable to the metallic conduit of heavy caliber such as φ 400-φ 1500.
4, owing to be the multilayer lap wound, inductance value and heating power are multiplied than single layer coil, have increased 2.2-2.6 doubly through the test double-layer coil than the inductance value and the heating power of single layer coil, and heating power density further increases.
The electromagnetic induction heating circle of this structure is very littler than the spacing of the electromagnetic induction heating circle of single layer structure with the gap of metal flat and pipeline, and the heat efficiency improves a lot.
Description of drawings
Fig. 1 is the structural representation of a kind of form of the present invention
Fig. 2 is the electromagnetic induction coil cross-sectional view of a kind of form of the present invention;
Fig. 3 is the structural profile schematic diagram of double-deck electromagnetic induction coil of the present invention;
Fig. 4 is the operation principle explanation schematic diagram of double-deck electromagnetic induction coil of the present invention;
Fig. 5 is the translation schematic diagram of double-deck electromagnetic induction coil of the present invention.
Among the figure: 1, metallic conduit; 2, composite laminate electromagnetic induction heating coil; 3, insulation material layer; 4, power line; 5, electromagnetic controller; 6, overcoat; 7, interior cover; 8, connector; 9, first coil; 10, second coil; 11, line tail; 12, the end of a thread; 13, lead.
Embodiment
Accompanying drawing has provided embodiments of the invention, and the invention will be further described below in conjunction with embodiment.From accompanying drawing as can be seen, the present invention adopts electromagnetic-induction heating method, it is characterized in that, described electromagnetic-induction heating method is to be attached to by the electromagnetic induction heating coil plane of multilayer stack or arcuation to be heated metalware or pipeline appearance, comes material in heating of metal vessel or the pipeline by direct heating of metal vessel of electromagnetic induction or pipeline.The composite laminate electromagnetic induction heating coil that is superposeed and formed by two-layer above solenoid is installed outside the metalware of need heating load or pipeline (magnetic conduction is electric conducting material again), the profile of composite laminate electromagnetic induction heating coil is the shape that the profile according to institute's heating of metal vessel or pipeline matches, after the composite laminate electromagnetic induction heating coil is first snail coiling, multilayer build-up gets up again, and according to the profile moulding of institute's heating of metal vessel or pipeline, can be plane or arcuation or semicircular.Magnetic line of force superposition after the stack of each layer electromagnetism heating collar can connect by polyphone between each layer electromagnetism heating collar on the metalware or pipeline of need heating load, adopts a lead coiling; Also can adopt and be connected in parallel.Whole composite laminate electromagnetic induction heating coil heating is by rectification circuit external AC to be pressed to become direct voltage, converting direct voltage to frequency through control circuit again is high frequency voltage, high frequency voltage is applied on the composite laminate electromagnetic induction heating coil again, flow through the composite laminate solenoid by the electric current that changes at a high speed and produce the magnetic field that changes at a high speed, when the magnetic line of force in the magnetic field passes through metalware or pipeline (magnetic conduction is electric conducting material again), will in metallic object, produce countless little eddy current, make metalware or pipeline at a high speed heating voluntarily itself, utilize material in electromagnetic induction method heating of metal vessel or the pipeline.
Embodiment one
From accompanying drawing 1 and Fig. 2 as can be seen, the present invention is a kind of composite laminate electromagnetic induction heating coil, comprise composite laminate electromagnetic induction heating coil 2, composite laminate electromagnetic induction heating coil 2 is installed in the outside of metallic conduit 1 and is connected with electromagnetic controller 5 by lead 13, and electromagnetic controller 5 is connected with external power supply by power line 4 again.Composite laminate electromagnetic induction heating coil 2 no magnetic cores, between the outer surface of its inner surface and metallic conduit 1, be provided with insulation material layer 3, it is characterized in that: described composite laminate electromagnetic induction heating coil 2 electromagnetic-induction heating methods are to heat by the electromagnetic induction heating coil that bilayer superposes.Outside the metallic conduit 1 of need heating load, be equipped with by the superposeed composite laminate electromagnetic induction heating coil 2 of shape plane, the compound half garden coiling that forms of double-deck solenoid, composite laminate electromagnetic induction heating coil 2 is the superimposed formations of double-layer coil, and the magnetic line of force superposition after the double-deck electromagnetism heating collar stack is on the metallic conduit 1 of need heating load.Composite laminate electromagnetic induction heating coil 2 is through plane coiling spiral coil, multilayer build-up gets up again, and make half garden shape coil according to the profile of metallic conduit 1, composite laminate electromagnetic induction heating coil 2 places between the overcoat 6 and interior cover 7 that insulating material makes, and be provided with connector 8, the two semicircle electromagnetic induction coils 2 that are used to be connected two semicircle composite laminate electromagnetic induction heating coils 2 in the joint portion of overcoat 6 and interior cover 7 and form a full circle that matches with carried metal pipeline 1 cylindrical by connector 8.Electromagnetic wire between the double-deck electromagnetism heating collar connects by polyphone, adopt a lead coiling, the entrance and exit of every layer line circle just in time joins, the mode of connection that coil adopts end of the same name to link to each other, and promptly the line tail 11 of first coil 9 is the end of a thread 12 of second coil 10.After electric current was input to electromagnetic controller 5 by power line 4,5 of electromagnetic controllers produced the superaudio electric current and receive on the composite laminate electromagnetic induction heating coil 2, form strong alternating magnetic field.The metallic conduit of this magnetic field and composite laminate electromagnetic induction heating coil 2 inside forms magnetic loop, this electric current is converted into heat energy by the self-resistance effect of metallic conduit again, thereby metallic conduit 1 is heated intensification, and act on the medium (as plastics, crude oil, water) that needs in the metallic conduit 1 to heat, to satisfy the requirement of production and transportation etc., the height of temperature can be adjusted by size of current or break-makes in the input electromagnetic controller 5.Present embodiment is mainly used in various large-scale longer pipes road heater mining site institute, refers in particular to be used for plastics (rubber) forming machine.
Embodiment two
Embodiment two is the same with the principle of embodiment one, the composite laminate electromagnetic induction heating coil of institute's lamination also is to be double-deck electromagnetism heating collar, just the profile of composite laminate electromagnetic induction heating coil is made arc structure according to applied pipe shape, and be combined to form a full circle by the composite laminate electromagnetic induction heating coil of multistage arc structure, every section two-layer compound lamination electromagnetic induction heating coil all is wrapped in by overcoat and the interior cover that insulating material is made, and being provided with the connector of the composite laminate electromagnetic induction heating coil that is used to be connected each section arc structure in the overcoat of every section composite laminate electromagnetic induction heating coil and interior cover junction, the composite laminate electromagnetic induction heating coil of each section arc structure couples together by connector.Inside coil lead between every section double-deck electromagnetism heating collar connects to adopt and is connected in series, also can adopt and be connected in parallel, direct entrance and exit unification with every layer is connected on the bus, will guarantee that just the electromagnetism line of force of two coils after superimposed superposes.This composite laminate electromagnetic induction heating coil is mainly used in the large diameter pipeline, takes multistage arc composite laminate coil, more helps processing and fabricating, installs also very convenient.
Embodiment three
Embodiment three is a kind of plane composite laminate electromagnetic induction heating coil, each composite laminate electromagnetic induction heating coil superimposed coil number be four layers, each layer line circle all is to be superimposed together after snail turns to again, for being connected in series, and the lead of every adjacent windings is end to end between coil and the coil; Be upper coil from outside to inside by the snail coiling, the line tail is positioned at the inside of coil, and the end of a thread of next layer line circle outside snail coiling from the lining, so the end of a thread of next layer line circle just in time joins with the line tail of upper coil.And four coils are that a lead turns to.The composite laminate electromagnetic induction heating coil is also got up by wrapped with insulation, in the outside of insulating material the fixedly connector of composite laminate electromagnetism heating collar can be set.This kind composite laminate electromagnetic induction heating coil can be widely used in the industrial and mineral place of various plane heating, refers in particular in the vulcanization of rubber heated plate.
Embodiment four
Embodiment four is the same with the principle of embodiment one, the composite laminate electromagnetic induction heating coil of two semi-circle plane coilings is formed the electromagnetism heating collar of a whole circle, its characteristics are that the composite laminate electromagnetic induction heating coil of two semi-circle planes coiling is the electromagnetic controller that is connected respectively to separately, are controlled the composite laminate electromagnetic induction heating coil of two semi-circle planes coilings respectively by two electromagnetic controllers.
Operation principle of the present invention is: after electric current is input to electromagnetic controller 5 by power line, become high frequency electric source after the over commutation conversion, by power line 4 electromagnetic controller 5 is produced the superaudio electric current again and receive on the induction coil 2, form strong alternating magnetic field.This magnetic field and induction coil 2 inside or the outside metallic conduit 1 interior magnetic loop that forms, this electric current is converted into heat energy by the self-resistance effect of metallic conduit 1 again, thereby metallic conduit 1 is heated intensification, and act on and need the medium that heats such as plastics, crude oil, waterborne in the metallic conduit 1, to satisfy the requirement of production and transportation etc., the height of temperature can be adjusted by size of current or break-makes in the input electromagnetic controller 5.