DE1937184U - ELECTROMAGNETIC DRIVEN FUEL CONVEYOR PUMP. - Google Patents

Description

B ₁ S ₁ S .09 / 599,
Conquered

<! mbH »Stattgart

R »ffr« 8064 4.2 »19ββ Iar / Bl

Blek t ^ omagnet js oh. ,, an e drive ea e _ι j & r af t stoff-

The invention relates to an electromagnetically driven one Fuel delivery pump ^ their iwmpeHiolbeii with the anchor an electromagnet and a spring counteracting this in back and forth <> limited by two piston end positions Work movements are offset "

In belsanntea pumps of this type, the movement of the pump piston takes place in the one direction of movement under the force of the electromagnet * in the other direction by the spring force * To a fairly constant over the course of a Förderhobes delivery pressure 2tä he Ielen ^ _9, the spring force is generally the Förderhrnbj, the magnetic force is assigned to the Saaghubj »The known electromagnetically driven fuel feed pumps have the disadvantage in common» that the Pampe stops _s when the amount of fuel withdrawn from the Pompe falls below a certain minimum value and can then no longer automatically move ₉ when the Excitation current of the electromagnet is switched on and off with the help of a switch operated by the pump piston. In this case it is necessary ^ to bring the puppet show, which controls the excitation current, into ß-ang again by means of a customary start device.

The invention had the object of au create _s an arrangement in polygamous marriages these start "and avoided IfiederanlaufSchwierigkeiten are" This look can be achieved by ^ that is inventively responsive to the respective position of Pampenkolbens and on ¥ the Blektromagneten acting switching device ersörgungsstromkreis provided , which maintain the excitation current in the piston end position reached when the spring is relaxed and up to

Reaching the other ₅ Eolbenendposition reached in the retracted position of the armature keeps switched on * there switches off and until aar return of the piston to the first position keeps switched off * This creates a position-dependent criterion with a switching hysteresis ₉ that is the same as the leg of the pump piston or only slightly smaller than this is*

Only the following arrangements are preferably considered as position-dependent _{criteria t with a switching hysteresis}

a) exposure to light on a photoelectric receiver (especially photo resistor),
Ta) Effect of a permanent magnet on a Hall probe $

c) Yeränderung the feedback of an astable multivibrator (particularly a blocking oscillator) in such a manner ₅ that in a certain position of the pump piston, the multivibrator energized, while it is hiersu in other Lafen the piston incapable * The Ansaugspannung of the multivibrator can be used directly or after DurÄLaufen suitable differentiator - and / or integrating elements are used as positioning criteria.

d) Changing an inductance with one of one separate G-enerator generated auxiliary sweehs el voltage fed becomes «the size of those lying at a work gear stand (if necessary, rectified) auxiliary voltage is from the Q-size of the inductance and thus the position of the pump piston dependent.

e) actuation of a switching ampoule filled with protective gas with the aid of a. Magnets, and optionally subsequent amplification with the aid of a transistor * Although this solution is not free of contact, but the Eontakte lie in the gesGhlossenen _s with Sehatagas filled glass ampoule and allow switching frequencies of 10 * # 1Ö circuits za.,

In cases e) and e), the position-dependent criterion has itself a hysteresis »In cases a)» b) and d) amß the hysteresis

be "included in TerstHÄer The amplifier meets these alteration For ₉ when it is formed as Sehaltverstärker (trigger particular as Schmitt ·) _s which also brings the Yorteil" Sass the rear Yerstärkerstufen work as switches.

A particularly simple arrangement results in see * if the position-dependent Eriterioia only between two positions, namely one and one an exhibition needs to distinguish * This can be done through reach*. that swisefaen the moving piston and the electric Sensing device one that is not or only slightly subject to aging Swisehengeld »e.g. a © Sehnappfeder or a Sehnappmagnet is switched,

A very safe and effectively aging independent circuit possibility is * brought lagnetwicklung the pump Torsugsweise a Terstärker _s su connected to the output of a bistable multivibrator of at L * 8rderende in its one (a) at the suction end to its other (off) stable position "Switching in the two end positions of the pump piston can, for example, take place again by one of the above-mentioned position-dependent criteria" The optical method according to suggestion a) is particularly suitable in this case. In this case, the two photoresistors can be built directly into the bistable multivibrator *

If approximately the same amount is required for <l ^ n suction stroke with the same suction height in all cases, the position-dependent switch-off of the electromagnet can also be replaced by a position-dependent bin maintenance with subsequent maintenance of the current for a certain length of time For a certain period of time, the multivibrator is triggered every week by a monostable multivibrator ^, for example, by one of the above-mentioned position-dependent criteria * The triggering is switched in such a way that it is not only momentary

the Erreiehens the conveyor end _s but throughout the Terwei & the piston dit in Forder-end position is effective "The one-shot zur'Preisersparnis may optionally

BQ are switched that the "inductivity of the ^ agnetwickluag is used as a timing element of the multivibrator"

In the drawing is an exemplary embodiment of the invention electromagnetic fuel feed pump shown *

Show Bs?

Fig. 1 is a longitudinal selector through the pump _f Fig. 2 is a section along line UI! in fig # 1 »Fig» 5 a section along line IXX-III in Fig. 2 and S ¹ Xg * 4 the electrical circuit diagram of the pump «In Pig» 5 is a modified embodiment in its axial longitudinal section and in

Fig * β in the axial plan view of the electrical switching device shown »

The Pompe has a delivery piston made of iaegneizable material, coated with a thin layer of chrome. 1 on "which is guided to and fro with tight play in a lifting cylinder 3 surrounded by the magnet coil 2 " consists of a coil body 4 injection-molded from plastic and a magnet winding 5 "The lobe of the coil body has a β thin-walled portion and a short thick-walled portion 7 ^ _S whose Bohrungsdurchiiesser smaller than that of Biabenabschnittes 6 "

In the thin-walled section β protrudes from a magnetizable Material existing bore 8 into it, the borrowed width of which corresponds to the bore diameter of the thick-walled hub section 7 · »The upper end of the protruding from the magnet coil Rohres S is ax of a flange-like ring disk 9 made of magnetizable Material firmly connected * on the outer edge of this ring

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by the facility described below is periodically interrupted *

In a bulge on its inner wall, the ramp housing 12 contains a longitudinal groove-like recess 2I ₉ in which a d @ m buffer ta of the delivery piston 1 via spokes-like ribs 22? 23 firmly connected to the support arm is guided movably for a stabfö3?-Shaped permanent magnets 25 · 24 parallel% UEX recess 21 is developed a check in the wall of the Pampengehäuses 12 is a cross-bore _26? into which a switching ampoule 27 is inserted from above. The switching ampoule 27 has a hermetically sealed glass bulb ₉ in its face. two strip-shaped of magnetizable material © switching contacts 28 and 29 are melted down «The hold contacts 28 and 29 are closed under the influence of the magnetic field of the permanent magnet 25 ₉ when the piston 1 and the permanent magnet 25 are the lower ones shown in Figures 1 and 2 of the drawing Take up position »The switch contacts 28.2 $ - '6f £ neM. sioh _s when the permanent magnet 25 has moved a certain amount upwards during the linsugging movement of the piston.

As can be seen from fig. 4 of the drawing, the ächaltkontalrfc-28 is connected to the base of a power transistor 31 via a resistor 3, while the switching contact 29 is connected to the linuspole of a power source (not shown). The emitter of transistor 31 is connected to the positive pole of the current source * Two emitter-base lines of the transistor are connected in parallel via a base resistor 32. "The collector of the transistor is connected to one end of the common winding 5, the other end of which is connected to the negative pole of the current source." A diode 53 is connected in parallel to the magnet winding 5; Winding when switching off induced voltage peaks is used.

The transistor 31 _9, the resistors 30 and 32 ₉ and the diode 33 sit on an insulating plate 34 in the cover 13 of the umpengehäuses 12 "on the raised end edge of the cover 13 lies

a closure plate 35 on ₉ which carries connection flags 36 * 37 and is clamped together with the decoil 13 by JPed tensioning bracket 3S ₉ 39 on the housing 12.

In closed Schaltkontskten 28 _s 29 has the voltage drop at - vcLreU ^ asiswiderstand 32 is controlled in the current-conducting state of the transistor 31 '"so that current flows through the solenoid winding 5 and therefore the lörderkolben 1 against the force of the spring pulled upwardly 20 blessing sin of Retraction movement controls the field of the permanent magnet 25 the switching contacts 28 _S 29 on f whereby the transistor 31 goes into the blocking state and the ^Ä agnetwiel £ ment 5 is de-energized «& at the other end, the return movement of the piston 1 caused by the tension of the spring 20 closes the Contacts 28 ₂ 29 again «, whereupon the work cycle begins again«

The piston 1 moves under the influence of the spring 20 as well as the field generated by the magnetic coil 2 in a freely swinging manner in the lifting cylinder 3 back and forth ₅ without hitting the bottom of the housing 12 Piston 1 moves in the full-stroke direction "whereas the spring 20 tensioned here moves the piston openly in the delivery stroke direction." out of the pump housing. During the subsequent filling stroke, fuel is displaced from the lifting cylinder 3 through the piston bore 17 and the pressure valve 18 into the pump chamber below the piston 1 «

ienn and as long as the internal combustion engine does not run out of fuel the delivery line connected to the nozzle 15 occupies * the piston 1 remains in the delivery line due to the overpressure in its upper order corresponding to the beginning of the funding period ~

periodic position * in which no current through the o% solenoid coil 5 flows "As long as the pump does not deliver so _s it consumes no electricity" SoDaId but the conveyor line fuel is removed * can Peder 20 the piston 1 in accordance with the fuel removal in! örderhabsizra shift,

The power consumption of the pump fits automatically

on*

In the modified exemplary embodiment according to FIGS. 5 and 6, the same or equivalent ropes are provided with the same reference numbers as in FIGS. 1 to 4. In contrast to the exemplary embodiment shown in these figures, the fuel feed pump according to the MGs 5 and 6 has a die-cast aluminum lamp housing 40 with an integrally formed suction port 41, the pressure chamber 42 of which is closed by a brass sheet 43 placed on the open face of the housing ists that is against the end face of the housing with an attached by screws, not shown pressure ring t 44 festgespan & * the S-egensatz for the first embodiment, both the Sehaltampulle 27 cp.er and the for opening and closing its contact vices 28 and 29 serving permanent magnet 25 to the Direction of movement of the pump piston 1 arranged. The ampoule is inserted into the cutout of an erag plate 45 made of pressed chip, which is fixed in the pressure ring and 32 _s so? / ie the transistor 31 and the diode 33 * which is used to suppress inductive switch-off peaks and which is connected in parallel to the coil 5

The permanent magnet 25 seats on the switching ampoule 27 facing end side of the plastic buffer 46, which is pressed into the end portion of Pumpenkolben® 1 and a plurality achsparallöle Durehlaßbohrungen 48 contains ₉ through which at Sinzugsbewogung of the piston 1, the fuel from aeia cylinder

Innenrataia S'in the printing room 42 and from there via a Lateral., gum a screw s of a delivery line, not shown serving Qaerbbohrung 47 can flow off »

When the piston 1 is in the position shown in fig "5 conveying end position ψ are the lengths 28 Eontakt ζ outgoing under the Sinfluß of SIIE then passing through ;, the permanent magnet 25 ,? Magnetic Steaeyflas0.es closed »Then the transistor 31 can produce the current flow aar magnet winding 5 and the piston 1 can be moved downwards against the force of the compression spring 2Θ. The contacts cannot immediately c5ffmen ₉ because they still remain in the stray field of the magnet 25 even with this pulling motion of the piston 1, but a defined amount of contact lengths 28 and 29 dependent on the piston travel can be achieved are provided on the outer end face of the upper flange-like Einseheibe 9 belonging to the same electromagnets awei magnetizable Earasehlußwinkel 50 and 51 & between their axially protruding legs of the magnet 25 b <& i its outward Angagsflugang an * taaeht »About these Karsschlaßwinkel 50 and 51 that The magnetic stray field of the permanent magnet 25 is passed into the ring disk 9 and is therefore deflected by the clamping tongs 28 and 29 "as soon as the piston 1 has moved sufficiently far into the cylinder 3 * as a result of the deflection of the stream field of the magnet 25 then the two switching contacts 28 and 29 open and the transistor 31 aar interruption of the flow via the opening circuit 5 Block en SrregerstroBies.

Since the contact rods 28 and 29 are spread apart from each other when the opening is open, _P measure see the permanent magnet 25 approaching the switching ampoule even further over the previously described Aussehaltstellung during the conveying movement of the piston 1 until its stray field can close these contacts again * Ear axial limitation of the contact ampoule 27 directed pressure movement of the piston 1 is bent radially from the right KurssehluBwinkel 51 an abutment tongue 52, which into a longitudinal groove

* 10 «

he AB intervenes in the iCuu & stoff stoff puff and thereby creates them so that the feed pump can itself aalaafen with every new Intoetrieteahae van «

Claims (1)

Expectations 1. Electromagnetically driven force! '"♦ F-pump, the pump piston of which is connected to the armature of an electromagnet, urn! Under the force of the electromagnet and bucket of this counteracting celebration in back and forth, through two piston positions Mgrenste work movements« It is also known that a switching device (27) acting on the respective position of the big piston (1) on the price shirt and on the supply circuit of the electromagnet (5) is provided> which is provided in the when the spring (2Θ ) erreiehten Kelbenemdstellung gerstrom turned the wrong "and to achieve the other * in the Einaugsstellung the anchor erreiehtem lCelbenends Settin g turned h & lt, off there and holds up sur return of the piston off in the first end position. £ ♦ Feed pump according to claim 1> characterized in that the switching device contains a photoelectric receiver, in particular a photo resistor and a diaphragm coupled to the piston, which intervenes in a light beam directed at the receiver. 3.! Pump according to claim 1, characterized in that the switching device has a permanent magnet (23) and a relative to this - 2nd X
, aft * Hall probe connected to the pump piston (1) (Hal- Wideyeta & d o & är Hall-ßenerator) contains. k. Pump according to Claim 1, characterized in that the switching device contains an astable multivibrator *, in particular an iron blocking oscillator, in which the control element (50 * 51) coupled to the pump piston (1) changes the coupling structure in such a way that the self-excited visual motion of the multivibrator is retained @ t is * as soon as the pusher stroke reaches and is maintained until the piston has moved from this end position to a predetermined distance, especially the distance from the suction stroke *, on the other hand, interrupts the oscillation in the other end position of the piston. 5 * pump naoh claim 1, characterized gekenmzeiehnet that the Schaltvorriehtuag a wit Sehutagas filled, $ ait bucket not magnetizable. Uiahillung provided Schaltaffipulle (§7) with two inside the Cover housed, made of magnet is Serbareia material Kindly contact (28, 29) and also one with the pump piston and hergoing permanent magnetem (SS), whose magnetic field in a Kolbe & endstellermg brings the contact promises into their Sahließstatus, 6. Pump according to claim 5 * geieeamseiehnet characterized in that the permanent magnet (25) and <äis Schaltaipulle (S7) for the direction of movement of the piston (1) is arranged. 7 · Pump © Baöh. Anspraeh β, characterized »that the permanent magnet (£ 5) aii the sfeiimflmehe of the pump (I) facing away from the compression spring (20) is arranged around the direction of movement of the foot is* 8 * Pump iiSrßh 'A & spraek 7 * «admroh kemmseieliiiet ,. Öass a di © A-us · 4es permanent vehicle over 4er Selialtampmlle besfcira-Kursöhlußv ^ rsfiehtaag (50> 51) for aen isfe » 9 · pump »Äöh Aaspr ^ acfe 8> daäurcla geiesnEseiehiaet, 4aß öie device tsm ± beidöreeiUs der ZyHnderiM & mmg (J) des Blektre * anortoete \ md with dea Eiseateilß. of the electromagnet vertically This Unterioge (description on <? Schufionsor.) isf the <uleW ainqereichhe. $ ls veichf / oft <} «word fossut> 5 <> e- originally submitted Unferiooen oo. The row SedeuTong <ie: deviation i $ (not checked. The originally submitted Un'erio ^ are found in five offices. You! Tonner, everybody- 'without further advice of a reshtiisheri Intetessei oebunrenfrel am <; esener. "Ercten On Anrroo ^ e <-the of these also fotokooieo or Fiim- ti- der, usual fteissr delivered Oeursches? oienromt.