A kind of electromagnetic pump for delivery of liquid non-ferrous metal
Technical field
The invention belongs to liquid non-ferrous metal conveying equipment technical field, relate in particular to a kind of for pumping liquid stateThe electromagnetic pump of non-ferrous metal fluid.
Background technology
Along with the development of electronic technology, the solder technology of electronic circuit board experienced artificial welding, wave-soldering andSeveral important stages such as Hui fluid welding. In recent years, due to automotive electronics, power electronics, the necks such as signal equipmentDeveloping rapidly of territory, various types of ventilating hole elements, surface mount elements, power component and various underloading orHeavy duty; The a large amount of series-parallel connections on pcb board of high pressure or low pressure connector, radiator or supporting member etc. load in mixture.Because the quantity of this type of work is increasing, quality requirement is more and more higher, and the demand that operating efficiency is promoted alsoMore and more urgent, manually welding or other forms of welding method can not meet the welding demand of PCB; ChoosingTherefore selecting property wave-soldering and technological equipment thereof arise at the historic moment.
The selective crest welder of initial production adopts Miniature mechanical pump to make high temperature tin stream pump, tin pump morePrinciple the same with traditional water pump, its cavity, rotating shaft, impeller is with high temperature resistant, corrosion-resistant material is made. ExcellentPoint is simple in structure; Shortcoming is that under hot conditions, lead-free solder is very fast to the corrosion rate of pump assembly, needsOften pump assembly is keeped in repair and changed. The more important thing is, the tin ripple jet flow that mechanical vane pump producesSpeed, flow are difficult to control, and the poor stability of tin stream, therefore, and the speed of tin stream, flow controlledProperty and stability need further to improve the demand that could adapt to high-end pcb board welding procedure.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of electromagnetism for delivery of liquid non-ferrous metalPump, is intended to solve employing Miniature mechanical pump of the prior art and makes the existing pump housing of liquid metal pumpMotion assembly corrosion rate metal flow speed, flow fast and ejection are difficult to control, and metal flow is steadyThe problem of qualitative difference.
The present invention is achieved in that a kind of electromagnetic pump for delivery of liquid non-ferrous metal, comprise power supply,Produce chronologically two-phase or multiphase driving pulse impulse generator, store liquid non-ferrous metal pot body,Core lamination stack heap, conduit and spout;
Described pot body and conduit are provided with entrance and outlet, the outlet of body of described pot and the entrance of conduitBe communicated with, described spout is installed on the exit position of described conduit; Described core lamination stack heap arranges and is distributed in instituteState the outside of conduit, the electromagnetism winding that described core lamination stack heap distributes along the some spacing of being axially equipped with of conduit,Described power supply, impulse generator, electromagnetism winding are electrically connected successively;
A thrust unit of core lamination stack heap and its upper adjacent electromagnetism winding formation, several thrust unit structuresBecome a thrust group, the electromagnetism winding in same group of thrust unit all accesses the driving pulse of same phase place; LogicalAfter electricity, core lamination stack is piled the adjacent contrary transient magnetic field of utmost point between cog polarization, the each thrust list in thrust groupUnit accesses respectively the driving pulse of different sequential; The common change chronologically forming from entrance to outlet of each thrust groupThe shifting magnetic field of changing.
Further, described conduit comprises inner catheter and outer catheter, and described inner catheter is embedded at described outer leadingIn pipe, and between the outside of described inner catheter and the inwall of outer catheter at a distance of a segment distance, form for liquidThe first flow of metal circulation, the inside of described inner catheter forms the second runner, the bottom of described the second runnerBe interconnected with the bottom of described first flow.
Further, the electromagnetic pump of described delivering liquid non-ferrous metal, is characterized in that, described electromagnetic pumpComprise multiple core lamination stack heaps, described multiple core lamination stack heaps enclose and are distributed in described outer catheter at intervalsOuter peripheral edges.
Further, the electromagnetic pump of described delivering liquid non-ferrous metal, is characterized in that, described secondThe bottom in road is equipped with throttling trunnion.
Further, the electromagnetic pump of described delivering liquid non-ferrous metal, is characterized in that, described pot bodyArranged outside is useful on the upper heater of liquid non-ferrous metal in the described pot of heating body.
Further, the electromagnetic pump of described delivering liquid non-ferrous metal, is characterized in that, described outer catheterThe arranged outside of bottom is useful on the lower heater of liquid non-ferrous metal in the described outer catheter of heating.
Further, the electromagnetic pump of described delivering liquid non-ferrous metal, is characterized in that, described iron core is foldedBetween sheet pile and the outside of described conduit, be also provided with heat insulation pad.
Further, described electromagnetic pump is also provided with control system, tin stream temperature control system and crest height surveyControl system; Described control system and described power supply, tin stream temperature control system, crest height TT&C system, pulseGenerator electrical connection.
Compared with prior art, beneficial effect is in the present invention: electromagnetism winding of the present invention is at impulse generatorEffect under according to sequential power supply, its associated core lamination stack heap utmost point tooth is magnetized, and along with the variation of magnetic flux is producedRaw shifting magnetic field, and make liquid non-ferrous metal produce the eddy current of inducting, the magnetic field that this eddy current forms and the magnetic of utmost point toothField interactions, promotes (asynchronous) motion at a high speed of liquid non-ferrous metal. Liquid metal is in the promotion of electromagnetic forceUnder, constantly from spout, gush out. Due to without using mechanical rotation movement parts, core lamination stack heap and electricityMagnetic winding does not directly come in contact with liquid non-ferrous metal, and therefore electromagnetic pump of the present invention does not exist pump housing fortuneThe problem of dynamic component corrosion, the long service life of product. Meanwhile, impulse generator can regulate driving pulseThe electrical quantitys such as frequency, pulsewidth and amplitude, flow velocity, the flow of the metal jet that this electromagnetic pump produces are controlled,Good stability.
Brief description of the drawings
Fig. 1 is that the master of a kind of electromagnetic pump for delivery of liquid non-ferrous metal of providing of the embodiment of the present invention is depending on showingIntention.
Fig. 2 is the perspective view of the inside of electromagnetic pump shown in Fig. 1.
Fig. 3 is longitudinal cross-sectional schematic of the inside of electromagnetic pump shown in Fig. 1.
Main circuit schematic diagram when Fig. 4 is the access of electromagnetic pump shown in Fig. 1 power supply.
Detailed description of the invention
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer,Below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that this place retouchesThe specific embodiment of stating only, in order to explain the present invention, is not intended to limit the present invention.
As shown in Figures 1 to 4, be a kind of preferred embodiment of the present invention, a kind of coloured for delivery of liquid stateThe electromagnetic pump of metal, comprises power supply (all not shown in figure), produces two-phase or multiphase driving pulse chronologicallyImpulse generator 1, the pot body 2 that stores liquid non-ferrous metal, core lamination stack heap 3, conduit 4 and spout5。
Pot body 2 and conduit 4 are provided with entrance and outlet. The pot outlet of body 2 and the entrance of conduit 4Be communicated with, spout 5 is installed on the exit position of conduit 4, and the latus rectum of spout 5 is 2~10mm. Core lamination stackHeap 3 is arranged at and the outside of uniform conduit 4, and core lamination stack heap 3 is axially equipped with some along conduit 4Apart from the electromagnetism winding 6 distributing. Power supply, impulse generator 1, electromagnetism winding 6 are electrically connected successively.
Core lamination stack heap 3 with its on adjacent two electromagnetism windings 6 form a thrust unit 60, same pushing awayTwo electromagnetism windings 6 in power unit 60 all access the driving pulse of same phase place, and after energising iron coreTwo contrary magnetic fields of the two poles of the earth between cog polarization that laminated stack 3 is adjacent. Several thrust units 60 form oneIndividual thrust group 600, thrust unit 60 quantity of each thrust group 600 are identical with the number of phases of driving pulse. WithEach thrust unit 60 in one thrust group 600 accesses respectively the driving pulse of different sequential; And, sameIn thrust group, all thrust units 60 of 600 are according to the sequential of the driving pulse accessing separately, along deviating from conduitThe direction of 4 entrances is arranged, the common conversion chronologically forming from conduit 4 entrances to outlet of each thrust group 600Shifting magnetic field.
Particularly, above-mentioned conduit 4 comprises inner catheter 41 and outer catheter 42, and inner catheter 41 is embedded at outer leadingIn pipe 42, and between the outside of inner catheter 41 and the inwall of outer catheter 42 at a distance of a segment distance, form confessionThe first flow 101 of liquid metal circulation, the inside of inner catheter 41 forms the second runner 102. The second runnerThe bottom of 102 bottom and first flow 101 is interconnected, and the bottom of the second runner 102 is equipped withThrottling trunnion 7. Known according to funnelling principle, fluid by throttling trunnion 7 after, enter relative cross-sectionThe larger section of passing through, the flow velocity of fluid can slow down, and makes the jet flow of outlet more stable, can play furtherThe effect of the steady ripple of throttling.
The electromagnetic pump of the present embodiment can be used for pushing various liquid non-ferrous metals, therefore, and when the scolding tin with meltingDuring as pushed object, the electromagnetic pump of the present embodiment can be used as the peak generator device of welding. ThisThe electromagnetic pump of embodiment is can be by two-phase, three-phase, heterogeneous or DC power supply, by DC inversion, wholeReason, the stable rear corresponding link use of supplying with. The effect of impulse generator 1 is to produce chronologically driving pulse,Supply with electromagnetism winding 6. Referring to Fig. 4, is a kind of three-phase bridge Y connection circuit, and it is by impulse generator 1Produce three-phase PWM pulse, then reach pwm pulse shaping distributor, apply by certain sequential and polarityIn final stage power MOS pipe, A, B, the apart 120 degree electrical angles of C three-phase sequential are again via pulse transformingDevice is fed to the thrust group 600 of three-phase. The electromagnetism of three thrust units 60 in the thrust group 600 of three-phase aroundGroup 6 is according to sequential successively energising, and its associated core lamination stack is piled 3 utmost point teeth and is magnetized, and along with the variation of magnetic fluxProduce shifting magnetic field, make in inside and outside conduit runner the tin fluid eddy current of inducting, magnetic field and the utmost point that this eddy current formsThe magnetic field interaction of tooth, along with the movement of shifting magnetic field, tin fluid is constantly pushed away to be sent, with (different at a high speedStep) motion. And constantly from spout 5, gush out, form stable dynamic tin ripple 200, enter with butt welding pointRow Selective Soldering. Meanwhile, impulse generator 1 can regulate frequency, pulsewidth and the amplitude of driving pulse, sprayThe metal flow good stability going out, its flow velocity, flow are controlled, can adapt to the need of high-end pcb board welding procedureAsk. In addition, the present embodiment adopts electromagnetic push to promote tin stream 200, without using mechanical rotation movement parts,Core lamination stack heap 3 does not directly come in contact with tin stream 200 with electromagnetism winding 6, the therefore electricity of the present embodimentThere is not the problem of pump housing motion assembly corrosion, the long service life of product in magnetic pumping.
Above-mentioned electromagnetic pump comprises multiple core lamination stacks heap 3, and multiple core lamination stacks heaps 3 enclose and all at intervalsBe distributed in the outer peripheral edges of outer catheter 42. The movement that each core lamination stack heap 3 electromagnetism windings 6 associated with it formMove according to certain rules from top to bottom in magnetic field, and its operating mode is similar to servomotor or DC brushless motor. ExampleAs, being centered around core lamination stack heap 3 that outer catheter 42 places side by side can be by the multi-set parallel row such as 4,6,8,10Row. Can be on contour position, the shifting magnetic field that has multiple magnetic poles to produce acts on melting in runner simultaneouslyTin stream, now, magnetic pole is equivalent to the stator of linear electric motors, and excitatory in shifting magnetic field of the tin of melting streamUnder effect, inductive loop as mover, orders about tin stream rapid moving from runner and delivers to spout 5, forms steadyFixed dynamic tin ripple 200. The active force being produced by multiple core lamination stack heap 3 electromagnetic push assemblies that form,For the tin stream 200 of melting, its driving effect is quite strong and powerful, therefore, and by polyphase multipolarThe electromagnetic pump that magnetic circuit and electromagnetism winding 6 form can produce the powerful steady thrust of uniform perseverance magnetic field, makes to formTin stream crest strong and powerful, size is suitably, highly permanent steady, contains specific electromagnetism arteries and veins shake component, favourableEffect of impregnation and the depth of penetration in the time improving components and parts welding, can significantly improve welding quality level.
The arranged outside of above-mentioned pot body 2 is useful on the upper heater 81 of the interior tin stream 200 of heating kettle body 2 and usesIn the upper heat-insulation layer 91 of insulation. The arranged outside of outer catheter 42 bottoms is useful on the interior tin stream of heating outer catheter 42200 lower heater 82 and the lower heat-insulation layer 92 for being incubated. By above-mentioned heating and heat preservation component,Both can in the time that pot body 2 heats, improve the efficiency of heating surface, and can make again tin stream 200 keep higher stable work temperatureDegree (>=280 DEG C). On the other hand, for fear of hot environment to core lamination stack heap 3 and electromagnetism winding 6Impact, between core lamination stack heap 3 and the outside of conduit 4, be also provided with heat insulation pad 10. Heat insulation pad 10Thickness need play heat insulation effect, meanwhile, again should be not blocked up, in order to avoid weaken by the magnetic field of outer catheter 42Intensity.
In order further to strengthen the welding quality of electromagnetic pump, the electromagnetic pump of the present embodiment be also provided with control system,Tin stream temperature control system and crest height TT&C system (all not shown in figure). Control system and power supply, tin streamTemperature control system, crest height TT&C system, impulse generator electrical connection, flow velocity, flow, the crest of tin streamThe generations of stability, crest height, welding temperature, PCB solder joint coordinate etc., can be by control system to relevantCircuits System closed-loop control.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, not all at thisAny amendment of doing within bright spirit and principle, be equal to and replace and improvement etc., all should be included in the present inventionProtection domain within.