CN202799232U

CN202799232U - Electromagnetic induction heater

Info

Publication number: CN202799232U
Application number: CN 201220400720
Authority: CN
Inventors: 杨蒙
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-13
Filing date: 2012-08-13
Publication date: 2013-03-13
Anticipated expiration: 2022-08-13

Abstract

The utility model relates to an electromagnetic induction heater of a welding plastic pipe and a metal plastic pipe. The electromagnetic induction heater comprises an electromagnetic heating controller, an excitation coil and a medium-high frequency transformer. The excitation coil has a number of turns of 2 to 10 with a zero load inductance value lower than 20 [miu]H, and is wound by a high-frequency copper wire which is twisted by multiple strands of fine copper wires. The excitation coil is in a hollow cylinder shape, and has an inner diameter no less than 20mm and a height of 10 to 250mm. The electromagnetic induction heater does not need a cooling system and thus is convenient for carrying and moving during when the heater is being used; the high-frequency transformer can supplement inadequacy of inductance value of the excitation coil, so that a suitable excitation coil can be wound in small space, and as a result, the electromagnetic induction heater can be applied to electromagnetic heating welding of plastic pipes as well as metal plastic composite pipes and corresponding electromagnetic hearing welding type pipe fittings.

Description

A kind of electromagnetic induction heater

Technical field

The utility model relates to the electromagnetic induction heater technical field, refers in particular to the electromagnetic induction heater of a kind of fusion joining plastic pipe and metallo-plastic pipe here

Background technology

The most important index inductance of electromagnetic induction heater significant components magnet exciting coil, when frequency certain, power requirement one regularly, the less then current requirements of inductance value is higher, so in the especially Metal Melting of medium-high frequency induction heating field, diathermanous field, when adopting the coil of low inductance (being lower than 10uH), general adopt higher operating frequency (such as 35KHz～1000MHz), output off current HIGH, generally surpass 60A even reach hundreds of amperes, because the alternating current frequency that this control circuit produces is higher, capacitor in its circuit and IGBT(or this pipe that rubs) heat that produces is larger, for the part of heater own is cooled off, generally to machine and need to adopt air blast cooling or water-cooled and require to have high cooling effect.Magnet exciting coil adopts thicker hollow copper tubing, same water-cooled or the high wind of adopting forces cooling (in the situation of the little and high electric current of coil diameter by the hydronic mode of copper pipe to copper pipe at a high speed, also exist the magnetic line of force itself to respond to copper pipe, so the situation of copper pipe induction heating, so must need to force cooling).And when adopting the multiturn coil of lower frequency and corresponding high inductance, this moment, electric current was corresponding can reduce, the copper cash of coil use can adopt thinner copper cash and design nonoverload (electric current is lower than the specified accurate live stream of coil copper cash) like this, then do not need thus to adopt water-cooled or air-cooled pressure cooling provision the technical method that adopt in Here it is domestic electromagnetic stove, molding machine heating field and large-scale workpiece heating, the hot field of companion.Here there is a technology blind spot, adopt upper frequency (35KHZ-1000MHZ) water-cooled copper can be fit to the heating of narrow workpiece as the way of magnet exciting coil, but need supplements outer water-cooled and air cooling equipment, cause machine weight heavy, volume is large, is not easy to carry; And adopt lower frequency (5-35KHZ) to cooperate the way of the real core copper cash magnet exciting coil of high inductance, machine volume and weight all are well suited for portable, (number of turn is more but because the number of turn of inductance value and coiling has the positive line sexual intercourse, inductance is larger), it is too small (such as the pipe of diameter 20～63mm to be heated workpiece such as fruit volume, specify simultaneously the length of heating region to be no more than 30mm), limited space, the inductance value (number of turn is not enough) that is difficult to the regulation that coiling goes out, because narrow space, also be difficult to the thick copper lines of selecting the end face sectional area larger, so be difficult to be applicable to the heating of small workpiece narrow range.

Be the medium-high frequency induction heating multilayer sealing fastening pipe of ZL201020237693.3 such as China Patent No., China Patent No. is the medium-high frequency induction heating multi-sealing plastic pipe fitting of ZL201020237670.2, China Patent No. is the pre-socket joint induction heating welding plastic pipe of ZL201120138231.0, China Patent No. is the pre-socket joint induction heating welding plastic fastening type pipe fitting of ZL201120138204.3, China Patent No. is the medium-high frequency induction heating plastic pipe of ZL201020237685.9, China Patent No. is a kind of fastening type pipe fitting of ZL201020276351.0, China Patent No. is the multiple seal hot melting fastening type pipe fitting of ZL201020188986.7, above-mentioned all fitting structures, when adopting the medium-high frequency electromagnetic induction heating technology to the plastics of METAL HEATING PROCESS and indirect steel-plastics composite pipe ectonexine plastics and pipe fitting, all there is the narrow and small problem of the actual needs heat affected zone of pipe fitting (the corresponding pipe fitting of pipeline of DN16～63mm diameter especially, according to national standard and town and country construction industry standard, effective heated length of its pipe fitting generally only is 20～36mm, at the desired inductance value of the general electromagnetic induction controller of narrow space coiling like this (normal operation 60～300uH, such as the civilian electromagnetic oven inductance coil more than the normal operation 90uH then) possibility is minimum, so necessarily require to get final product so that the electromagnetic induction controller is started working in the coil scope of 2～10 circles, even but 10 circle coils, its inductance value also is difficult to surpass 20uH, if at this coil inductance weight range, the machine of the operating frequency of relative 5-35KHZ, the design that is lower than control circuit corresponding to 20uH inductance coil will be very difficult.The more important thing is when pipeline is installed, when the situation that elbow, threeway occur and be plugged into an end of pipeline, circular magnet exciting coil is difficult or be inconvenient to very much to be set to pipe fitting and get on, but so consider magnet exciting coil is cut and embeds in the anchor clamps of a band closing device, with master-slave socket the coil breaking part is connected into one again in the clamping pipe fitting induction heating position or with magnet exciting coil directly around to pipe fitting, going, obviously, the Width that master-slave socket itself has is larger, and too much coil turn of while bothers when can bring coil to peg graft very much, failure rate is high; Adopting magnet exciting coil directly when going to pipe fitting, the number of turn of magnet exciting coil is fewer, and coiling Vietnamese side just.So require the number of turn of magnet exciting coil more few better, had better not surpass 6 circles (inductance value can not surpass 10uH usually), like this, magnet exciting coil often just has good reliability under group operational environment of inserting, simultaneously, directly coiling just has higher operating efficiency to pipe fitting.In fact, more than similarly pipe fitting also can adopt medium-high frequency electromagnetic controller with water-cooling system (such as present high-frequency quenching, the medium-high frequency electromagnetic controller that melting is used), but obviously, if adopting the medium-high frequency electromagnetic controller with water-cooled or air cooling system (annotates, air cooling way there is no mature technology at present), only water-cooling system is exactly tens of kilogram weights, for small pipeline installing area and the parts heating field (such as the dismounting of automobile screw) that needs Portable heating, can't frequently not move owing to do not have portability, so be not have practicality fully.

In the research that domestic patent of applying at present and technical staff are engaged in, aspect the research of Portable electromagnetic induction heating machine, the application study that few people heat for small space or miniature workpiece.Some patented technologies of applying for mainly for be the circuit design of electromagnetic induction controller and about the winding method of coil, also there is considerable patented technology to occur, but all do not take into full account at least the technical merit (such as electric capacity and IGBT) of the related basic components and parts of electromagnetic controller circuit about these technology of winding method of coil, and a supposed premise is in fact arranged: the inductance value that is exactly magnet exciting coil is can be according to the job requirement coiling success of electromagnetic controller.Electromagnetic induction controller host aspect does not carry out the application study that the low inductance coil can be worked yet.So true having caused relates to the Portable electromagnetic controller's design blank that workpiece heats among a small circle.Even dismantle this simple technical field in the heating of automobile screw, what also all adopt at present is the machine of Germany, Switzerland's import, and price is very expensive.

And for example China Patent Publication No. is the pipe welding fixture of CN202123664U, the electromagnetic induction pipe connects equipment, and Chinese patent application number is the pipe welding fixture of ZL201110174570.9, the electromagnetic induction pipe connects the e-quipment and pipe solenoid tube and connects method, related anchor clamps wherein, in the coiling of coil, do not make an explanation, be the installation of small-sized pipe fitting according to its application, because the anchor clamps of its design all do not state clearly the winding method (this is the technology point of a key) of magnet exciting coil, do not show that too its coil is to have the coil that is connected to form again closing structure after the disconnection, what can only be understood as employing is the arcuation coil of plane coiling, after bending, be arranged in the anchor clamps, be connected with the electromagnetic induction controller simultaneously.Obviously, reach the needed winding inductance quantity of electromagnetic induction controller, in the situation that does not adopt medium-high frequency up-flow step-down transformer, can only adopt the fine copper wire about 1 square millimeter, and coiling 80～120 circles reach the above basic inductance requirement of inductance requirement 60uH, in narrow space like this, not only coiling difficulty, the more important thing is, the electric current that passes through will be no more than the 5A power limited, and (40UH can start the machine in lower inductance requirement in general, can continuous firing more than the 60UH) work, generally all will adopt the half bridge circuit design, it is not enough that semibridge system raising frequency circuit has been proved to be stability, the most important thing is that output current fluctuation is large, in case electric current raises in the course of the work, then the fine rule overload that adopts of magnet exciting coil can cause coil temperature to raise, and the too high concept order operation in manually clamping of high frequency voltage becomes more dangerous because of high voltage, causes easily personal injury; The pipe fitting that reaches appointment is installed effect, required time is long (generally will arrive about 200 seconds) also, and the high thermal conductivity of steel pipe itself can with the plastic molting above the steel pipe of covering beyond steel-plastics composite pipe and the pipe fitting plugging position, make installation quality be greatly affected.And, above-mentioned patent has added thickly dotted magnetic stripe at the periphery of coil, magnetic flux when increasing work also just be based on for its operating efficiency can't improve, one of the uppity weakness of installation quality replenish, but this mode can't fundamentally overcome the above problems, and the making of anchor clamps will be very complicated.

We applies for a patent name and is called " a kind of electromagnetic induction heater " before the applying date, it is the heating field for small pipeline or small-sized metal piece, general preferred diameter of work is no more than the DN125mm(fact can do a certain amount of expansion, but heating rate efficient is lower slightly) can reach optimal effect, so defining its output alternating current frequency is 5-35KHZ, in this working range during simultaneously for the relatively large pipeline that surpasses the DN125mm diameter or workpiece, the chopped-off head output current is generally 1-15A, normal operation is the 6-15A(circuit design different according to power, can arrive 60A even higher), and by medium/high frequency transformer electric current is raise, the mode that voltage reduces is in proportion carried out induction heating to interface or other workpiece of pipeline and pipe fitting, the advantage of this mode is that voltage is lower, very safe in the course of work, electric current raises by medium/high frequency transformer simultaneously, improves the efficient of induction, and this utility model is particularly suitable for carrying out induction heating for ferrous material (Fe).By improving the output frequency of circuit, even without very large output current, its induction heating efficient also corresponding to improve many, but for weak magnetic material, such as aluminium or stainless steel, excessively low frequency (35KHZ is following) usually can not reach desirable heating effect, when normally reaching the frequency of 80KHZ, aluminium or stainless steel (non-magnetic type stainless steel is such as 304 stainless steels of feedwater purposes) there are reasonable inductive effects, and have taken into account the induction heating ability to steel simultaneously.So, redesign by circuit, and take into full account the electric capacity that uses in the present circuits and the carrying scope of IGBT, in the situation of not using water-cooled or air-cooled pressure cooling, preferred output frequency can have better compatibility, can carry out induction heating to aluminium, stainless steel, steel material simultaneously.

The utility model content

The purpose of this utility model be to provide a kind of for the deficiencies in the prior art and need not cooling system, be fit to plastic tube and composite metal-plastic pipe and the welding of pipe fitting electromagnetic induction heating, simultaneously compatibility to the electromagnetic induction heater device that is easy to carry mobile of the induction heating of weak permeability magnetic material such as aluminium and stainless steel material.

To achieve these goals, the utility model provides a kind of electromagnetic induction heater, it comprises electromagnetic heating controller, magnet exciting coil and medium/high frequency transformer, described medium-high frequency electricity output is electrically connected with the input of described medium/high frequency transformer, and the output of described medium/high frequency transformer is electrically connected with described magnet exciting coil; The number of turn of described magnet exciting coil is that 2～10 circles, its unloaded inductance value are lower than 20uH, and described magnet exciting coil is to be formed by the high frequency copper wire winding, and described high frequency copper cash is to form by the multiply fine copper wire is stranded, and described magnet exciting coil is the cylinder hollow shape; The internal diameter of described magnet exciting coil for more than or equal to 20mm, highly be 10～250mm.

Each circle warp of described magnet exciting coil axially neatly cuts and forms one with the cylinder hollow shape of opening, and the two ends of the breaking part of each circle of described magnet exciting coil are respectively arranged with corresponding master-slave socket, form closing coil by the master-slave socket grafting during work.

Describedly place the anchor clamps of open-close type with the cylindric hollow magnet exciting coil correspondence of opening, the breaking part of described cylindric hollow magnet exciting coil with opening connects by male and female copper plug formula..

Described magnet exciting coil is comprised of two half coil grafting that are the semicolumn hollow shape.

Described two half coil correspondences place the anchor clamps of open-close type, and each circle coil of the correspondence of described two half coils connects by male and female copper plug formula.

The arc coil of described magnet exciting coil for being formed by the plane coiling of high frequency copper cash.

Described magnet exciting coil by place soft with on the high frequency copper cash connect and compose, described soft with on an end of high frequency copper cash be provided with the sub-plug connector of service message, described soft with on the other end of high frequency copper cash be provided with female electronic connector.

Described electromagnetic heating controller is arranged at civil power is converted to galvanic rectification circuit, direct current converted to the control circuit of medium-high frequency electricity, the input of described rectification circuit is electrically connected with the mains electricity input end of described electromagnetic heating controller, the output of described rectification circuit is electrically connected with the input of described control circuit, and the output of described control circuit is electrically connected with the medium-high frequency of described electromagnetic heating controller electricity output; The frequency of the alternating current of described medium-high frequency electricity output output is that 35～150KHz, size of current are 10～150A.

The calibration 40-120KHZ scope of the alternating current of described medium-high frequency electricity output output.

Described medium/high frequency transformer is the up-flow step-down transformer, and the turn(s) ratio of described medium/high frequency transformer is 10:1～1:1, and the overall inductance amount of described medium/high frequency transformer is greater than 20uH; Described medium/high frequency transformer is with after described magnet exciting coil is connected, and the whole unloaded inductance value of described medium/high frequency transformer and described magnet exciting coil is more than the 40uH.

The utility model beneficial effect is: the utility model is applicable to the operating frequency range (35-200KHZ) of circuit, magnet exciting coil adopts and is formed by the stranded high frequency copper wire winding of multiply fine copper wire, it need not to adopt cooling system, movement in use is easy to carry, medium/high frequency transformer of the present utility model can replenish the deficiency of magnet exciting coil inductance value, make the utility model go out suitable magnet exciting coil in the narrow space coiling, thereby make it be particularly suitable for the among a small circle heating of micro metal pipe and the small-sized profiled piece of metal, the electromagnetic induction that is fit to too the various pipes of different bores is installed welding, has more had the especially induction heating of aluminium and stainless steel of weak permeability magnetic material concurrently.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment 1.

Fig. 2 is the structural representation of the magnet exciting coil of the utility model embodiment 2.

Fig. 3 is the side structure schematic diagram of the magnet exciting coil of the utility model embodiment 2.

Fig. 4 is the structural representation of the magnet exciting coil of the utility model embodiment 3.

Fig. 5 is the structural representation of the magnet exciting coil of the utility model embodiment 4.

Embodiment

Below in conjunction with accompanying drawing the utility model is further described.

Embodiment 1

Please refer to Fig. 1, the utility model provides the electromagnetic induction heater of a kind of electromagnetic induction heater fusion joining plastic pipe and metallo-plastic pipe, it comprises electromagnetic heating controller 1, magnet exciting coil 2, medium/high frequency transformer 3, the medium-high frequency electricity output 12 of electromagnetic heating controller 1 is electrically connected with the input of medium/high frequency transformer 3, makes electromagnetic heating controller 1 the medium-high frequency electricity that is converted to can be exported to medium/high frequency transformer 3; The output of medium/high frequency transformer 3 is electrically connected with magnet exciting coil 2, make medium/high frequency transformer 3 can the medium-high frequency electric boost rectification with input after, export to again magnet exciting coil 2, workpiece is heated by electromagnetic induction by magnet exciting coil 2; Wherein, the number of turn of magnet exciting coil 2 is 2～10 circles, and 4 circles, unloaded inductance value that present embodiment is selected are lower than the 20uH(microhenry), to improve the operating efficiency of magnet exciting coil 2; Magnet exciting coil 2 is to be formed by 21 coilings of high frequency copper cash, and high frequency copper cash 21 is to form by the multiply fine copper wire is stranded, makes the utility model need not to adopt cooling system, and movement in use is easy to carry.

In the present embodiment, magnet exciting coil 2 is formed by high frequency copper cash 21 helically coilings, and magnet exciting coil 2 is the cylinder hollow shape, with for the steel pipe pipe heating of rule or the ectonexine plastics indirect of steel-plastics composite pipe; Wherein, the internal diameter of magnet exciting coil 2 is greater than by the time in the 20mm(millimeter), highly be 10～250mm, the tubing that heats to mate corresponding needs.

Wherein, electromagnetic heating controller 1 is provided with for civil power being converted to galvanic rectification circuit, being used for direct current is converted to the control circuit of medium-high frequency electricity, the input of rectification circuit is electrically connected with the mains electricity input end 11 of electromagnetic heating controller 1, the output of rectification circuit is electrically connected with the input of control circuit, and the output of control circuit is electrically connected with the medium-high frequency electricity output 12 of electromagnetic heating controller 1; The frequency of the alternating current of medium-high frequency electricity output 12 outputs is 35～200KHz(KHz), size of current is 10～150A(peace); Certainly, be 50Hz or 60Hz in the frequency of the above-mentioned civil power of China, operating voltage is the 220V(volt) or 380V; And (being under the idle condition) in the situation of not considering load, magnet exciting coil 2 work overall inductance require more than or equal to 40uH; Be provided with Hall current sensor in the electromagnetic heating controller 1, for detection of the current values of output medium-high frequency electricity.

Wherein, medium/high frequency transformer 3 is the up-flow step-down transformer, and the turn(s) ratio of medium/high frequency transformer 3 is 10:1～1:1, and namely the input line number of turns of medium/high frequency transformer 3 is 10:1～1:1 with the ratio of the output line number of turns; The overall inductance amount of medium/high frequency transformer 3 is greater than 20uH; Medium/high frequency transformer 3 is with after magnet exciting coil 2 is connected, and medium/high frequency transformer 3 is more than the 40uH with the whole unloaded inductance value of described magnet exciting coil; Coil in the medium/high frequency transformer 3 adopts the high frequency copper wire winding to form too, and the high frequency copper cash also is to form by the multiply fine copper wire is stranded; The effect of medium/high frequency transformer 3 is the up-flow step-down, replenishes simultaneously the deficiency of magnet exciting coil 2 inductance, the current commutates to 2 that medium/high frequency transformer 3 can be exported electromagnetic heating controller 1～150A.When the turn(s) ratio of medium/high frequency transformer 3 was 1:1, medium/high frequency transformer 3 itself became an inductance, and only played the effect of the inductance that increases operating circuit.

Wherein, the fine copper wire of magnet exciting coil 2 is enamel covered wire or silver-coated copper wire, and the sectional area of fine copper wire is 2～40 square millimeters; The inductance value of magnet exciting coil 2 is 0.1～20uH under idle condition, and interior diameter is more than or equal to 20mm, and the degree of depth is 10～250mm, and its inductance measurement standard is for using the drawn data of unloaded coil under digital electric bridge, 1K Hz, the series resonance shelves condition.

In the present embodiment, electromagnetic heating controller 1 and medium/high frequency transformer 3 are arranged for dividing, and certainly, according to needs of production, described electromagnetic heating controller 1 and medium/high frequency transformer 3 also can be built in the casing, are not limited only to the structure into present embodiment.

When this electromagnetic heating controller 1 work, be plugged in the small-sized workpiece (the small-sized maximum gauge of workpiece that is heated is less than or equal to the maximum inner diameter of magnet exciting coil 2) that is heated of magnet exciting coil 2 interior hollow positions, can make the rapid heating of workpiece reach the purpose of other material of heating of metal itself or indirect and Metal Contact.For example: the magnet exciting coil 2 of present embodiment can be inserted in steel pipe pipe or the steel-plastics composite pipe, by the ectonexine plastics indirect of electromagnetic induction principle to the heating of steel pipe pipe or steel-plastics composite pipe.Wherein, but the metal that the utility model is applicable to heat is magnetic conduction and conductive metal, such as steel, iron, magnetic stainless steel etc., because adopted higher Frequency Design, also be suitable for aluminium, stainless steel (weak magnetic conduction type), specifically can be fit to the installation with the pipeline of Types Below: A, the multiple tube of inner plastic+outer layer metal or inner plastic+intermediate layer PUR+outer layer metal type multiple tube, comprise the aluminium alloy plastics lined pipe, the stainless steel lining plastic pipe, steel-lined plastic composite pipe, corresponding pipe fitting are patent ZL201120138204.3 " pre-socket joint induction heating welding plastic fastening type pipe fitting ", ZL201120138231.0 " pre-socket joint induction heating welding plastic pipe ".B, inner plastic+metallic intermediate layer+outer layer plastic type multiple tube or inner plastic+hot melt adhesive layer+metallic intermediate layer+hot melt adhesive layer+outer layer plastic type multiple tube refers generally to PAP, PSP steel-plastic composite pressure pipe, hole pattern steel band multiple tube.Corresponding pipe fitting is the described medium-high frequency induction heating multilayer sealing fastening pipe of patent ZL201020275351.0 " a kind of fastening type pipe fitting ".ZL201020237693.3 " medium-high frequency induction heating multilayer sealing fastening pipe ".ZL201010171452.8 " multiple seal hot melting fastening type pipe fitting ", ZL201020237670.2 " medium-high frequency induction heating multi-sealing plastic pipe fitting ".C, pure-plastics pipe refer generally to PPR pipe, PE pipe, PB pipe, ABS pipe, CPVC pipe, and corresponding pipe fitting is patent ZL201020237685.9 described " medium-high frequency induction heating plastic pipe ".

Embodiment 2

Please refer to Fig. 2～3, be embodiment 2 of the present utility model, the difference of present embodiment and embodiment 1 is that magnet exciting coil 2 is the cylinder hollow shape, and magnet exciting coil 2 is comprised of two half coil 22 grafting that are the semicolumn hollow shape.More particularly, two half coil 22 correspondences place the anchor clamps 23 of open-close type, and namely a half coil 22 places semicircular anchor clamps 23, and another half coil 22 places another semicircular anchor clamps 23; One end of two half coils 22 connects by metal folding spare 24, and the other end of two half coils 22 is inserted 252 hair styles by male and female copper and connected, for example: public copper is set on the half coil 22 inserts 251, corresponding female copper is set on another half coil 22 inserts 252; The internal diameter of magnet exciting coil 2 for more than or equal to 20mm, highly be 10～250mm, with the ectonexine plastics indirect for steel-plastics composite pipe.

The magnet exciting coil 2 of present embodiment in use, as long as open first anchor clamps 23, one end of two half coils 22 is opened, be that male copper is inserted 251 and inserted 252 with female copper and separate, sandwiched steel-plastics composite pipe etc. needs the workpiece of heating again, makes male copper insert 251 and inserts 252 with female copper and peg graft mutually, i.e. two half coil 22 closures, consist of closing coil, and the workpiece of the needs heating such as steel-plastics composite pipe is positioned at closing coil, thereby by electromagnetic induction principle the workpiece that the needs such as steel-plastics composite pipe heat heated.Because the magnet exciting coil 2 of present embodiment be retractable structure, so can be conveniently used in the heat welded that elbow, threeway are plugged into the situations such as pipeline.

Other structure of present embodiment is identical with embodiment 1, does not repeat them here.

Embodiment 3

Please refer to Fig. 4, be embodiment 3 of the present utility model, the difference of present embodiment and embodiment 1 is, the arc coil of magnet exciting coil 2 for being formed by the 21 plane coilings of high frequency copper cash, be that magnet exciting coil 2 is for plane, by irregular bending, with the heating for irregular miniature workpiece.Certainly, the shape of workpiece of heating as required, described magnet exciting coil 2 also can be made the shape with the workpiece coupling, makes magnet exciting coil 2 more be convenient to workpiece is heated, and is not limited only to the shape selected for present embodiment.

The magnet exciting coil 2 of present embodiment can with magnet exciting coil 2 near irregular miniature workpiece (for example: be installed in the screw in the automobile environment), heat irregular miniature workpiece by electromagnetic induction principle in use.

Embodiment 4

Please refer to Fig. 5, be embodiment 4 of the present utility model, the difference of present embodiment and embodiment 1 is, magnet exciting coil 2 softly connects and composes with the high frequency copper cash 21 on 28 by placing, a soft end with the high frequency copper cash 21 on 28 is provided with the sub-plug connector 271 of service message, the soft other end with the high frequency copper cash 21 on 28 is provided with female electronic connector 272, pegs graft mutually with female electronic connector 272 of the other end when the sub-plug connector 271 of the service message of high frequency copper cash 21 1 ends, namely forms closing coil.

The magnet exciting coil 2 of present embodiment in use, can be wrapped on the workpiece that needs heating with 28 by soft, again the sub-plug connector 271 of service message is pegged graft mutually with female electronic connector 272, form closing coil, thereby heat by the workpiece of electromagnetic induction principle to the needs heating.Because the magnet exciting coil 2 of present embodiment is arranged on soft being with on 28, thus can fold arbitrarily, and be fixed on easily on the workpiece that needs heating.

Should be noted that at last; above embodiment is only in order to illustrate the technical solution of the utility model; but not to the restriction of the utility model protection range; although with reference to preferred embodiment the utility model has been done to explain; those of ordinary skill in the art is to be understood that; the technical solution of the utility model is made amendment or is equal to replacement, all belong to protection range of the present utility model.

Claims

1. the electromagnetic induction heater of a fusion joining plastic pipe and metallo-plastic pipe, it comprises electromagnetic heating controller, magnet exciting coil and medium/high frequency transformer, described medium-high frequency electricity output is electrically connected with the input of described medium/high frequency transformer, and the output of described medium/high frequency transformer is electrically connected with described magnet exciting coil; The number of turn of described magnet exciting coil is that 2～10 circles, its unloaded inductance value are lower than 20uH, and described magnet exciting coil is to be formed by the high frequency copper wire winding, and described high frequency copper cash is to form by the multiply fine copper wire is stranded, and it is characterized in that: described magnet exciting coil is the cylinder hollow shape; The internal diameter of described magnet exciting coil for more than or equal to 20mm, highly be 10～250mm.

2. electromagnetic induction heater according to claim 1, it is characterized in that: each circle of described magnet exciting coil forms one with the cylinder hollow shape of opening through axially neatly cutting, the two ends of the breaking part of each circle of described magnet exciting coil are respectively arranged with corresponding master-slave socket, form closing coil by the master-slave socket grafting during work.

3. electromagnetic induction heater according to claim 2, it is characterized in that: describedly place the anchor clamps of open-close type with the cylindric hollow magnet exciting coil correspondence of opening, the breaking part of described cylindric hollow magnet exciting coil with opening connects by male and female copper plug formula..

4. electromagnetic induction heater according to claim 1 is characterized in that: described magnet exciting coil is pegged graft by two half coils that are the semicolumn hollow shape and is formed.

5. electromagnetic induction heater according to claim 4, it is characterized in that: described two half coil correspondences place the anchor clamps of open-close type, and each circle coil of the correspondence of described two half coils connects by male and female copper plug formula.

6. electromagnetic induction heater according to claim 1 is characterized in that: the arc coil of described magnet exciting coil for being formed by the plane coiling of high frequency copper cash.

7. electromagnetic induction heater according to claim 1, it is characterized in that: described magnet exciting coil by place soft with on the high frequency copper cash connect and compose, described soft with on an end of high frequency copper cash be provided with the sub-plug connector of service message, described soft with on the other end of high frequency copper cash be provided with female electronic connector.

8. the described electromagnetic induction heater of any one claim according to claim 1-7, it is characterized in that: described electromagnetic heating controller is arranged at civil power is converted to galvanic rectification circuit, direct current converted to the control circuit of medium-high frequency electricity, the input of described rectification circuit is electrically connected with the mains electricity input end of described electromagnetic heating controller, the output of described rectification circuit is electrically connected with the input of described control circuit, and the output of described control circuit is electrically connected with the medium-high frequency of described electromagnetic heating controller electricity output; The frequency of the alternating current of described medium-high frequency electricity output output is that 35～150KHz, size of current are 10～150A.

9. the described electromagnetic induction heater of any one claim according to claim 8 is characterized in that: the calibration 40-120KHZ of the alternating current of described medium-high frequency electricity output output.

10. electromagnetic induction heater according to claim 1, it is characterized in that: described medium/high frequency transformer is the up-flow step-down transformer, the turn(s) ratio of described medium/high frequency transformer is 10:1～1:1, described medium/high frequency transformer is with after described magnet exciting coil is connected, and the whole unloaded inductance value of described medium/high frequency transformer and described magnet exciting coil is more than the 40uH.