Note: Descriptions are shown in the official language in which they were submitted.
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wo 981003g9 ~ YrlO2671
Device for the measurç~ trans~er of several liquids o~ ~e same klnd.
The inven~on concems a device for the measured t._. .s~r of s~eral liquids of
~e same kind, in particular a petrol pump for liquid fuels.
C~vices ac~r~ y to the generic terms of claim 1 are kno~n f~om ~e sbte of
~e art A fuel pump for Jifl~r~nt types of liquid fuels, such as p~trol, contains a
plurali~y of ~uel dispenser~, such as deli~ ery, ~ s, which are 11tted to the end
of the delive~y hose. Each of such fuel dispensers is ~ssiy~lGJ to a par~cular
~rpe of fuel and each of such fuel dispen~r~ is cor",e~ ugh a supply
line to the con~, on~l;.,g supply 1~nk. I~ ed l,~ dispe.,ser and
its cGr._,pon~ing supply tank, each supply line confains a ~e'r~_.r pump ànd
an ssoci~tc~l measuring device for liquids. If, for exan~ple, ~ petrol pump
contains ~ree delivery ~uel .Jbpensers for normal petrol, Su~er and Super
Plus, *en altoy~ r three n.~ ring devi~s are in use hr types of fuel,
which are basically similar. 1~ s ~ing devicos such as theso ar~ Lshre
and require re calibraffon from time to ffme.
~he imren'don is based on ~e requ;re,..~llt to ad~rance a gener~c device which
has adv~"b~ s in use and is simple to man~ re
The requirement is solved by the inven'don cited in ffle cbims.
I
According to the invention, such a ye,~.:.ic device may be ~anufadured at
lowor cost, is smaller in sée and simplor to mainhin The inve~tion ~ ose s
a cl;..-.no.. Iiq~id measuring device for a plurality of similar fluids, s~lutlewithin each other, which, depen~lng on ~e required fluid, ar~ connected by
means of an arrang~l-.e,lt of valves to tihe cor.esponding supply line Le~r~eon
supply tank and fuel dispenser. The invenffon recognises the ~act, that in the
transfer of liquids in a generic device only one ~uel dispenser rr~y be in use at
.
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any one time, whilst the other huel ~ispe- ,sers are idle. To disp~ay ~e amount
of fuel trans~erred, a common display is provided It has been e~tablished, that
the fuel remaining in the common liquid measuring d~vicQ ren~ains below the
cGr-espo..ding calibra~on tolerance, so that it must be a;~"~ble, that
sG."ao,.e, who for example draws normal petrol, also ~~ i~ves a small amount
of Super petrol, which had been sel~h~ by ~e person before him. For
pr~ference, a screw spindl~ anye.,.~.~t is sel~t~ as li~id measuring
device, such as the one d~s_~iL~J in ~E-OS 41 42 062. The cl~rance volume
~f the two intermeshing screw spindles, one of which is oonnected to a
rotational counter, is very small anJ in ~e order of about 13 cma With a t~picalrninimum amount of 51 of fuel dispensed, this amount is ~er~ore below ~e
caliL~.,tiG-- toleranQ In a pr~,f~n~ ~ ..yement of the i~,~n~ , a valYe has
been fi~ed d~u ,s~leam of each pump and a valvo tlas been fi~ upsl..,_.., of
each fuel cl;~e,.~er. The ~No resulting amnge.~ ~ of valves, are connected
in the shape of a triple-way or multi~vay valve. The c~ on li~uid measuring
device is ;~ ed b~Heen ~ese valve arrangements, so ~at by sui~able
sefflng of ~e of ~e 'aiple way or mul~way valv~s the liquid m~suring device
is be ccl-ne~,t.3d be~een a fuel ~isp6n~er and its ~I.espondirq supply ~nk.
~he valve mount~ downstream of each pump and ~ v#lve mounW
upstream of each fuol dispel,ser may be linked lv~ Ll.er. In a ~ria~on of this
arrangement, valves downstream of the mcasuring device may oo- ~t of non-
retum va~ves. In ano~7er vers~ion, valves d~w,-~_3.l~ o~ ~- me suring deYico
may be associated with ~e d~ .y noz!es, liDr manual oper~on. An
electronic circuit may then ensure, ~at, to prevent ihCG- ~~cL op-raffon, ~e fuel
supply is cut ofl if more ~an one delivery nozlc is used simulbneously. For
such a purpose it could be arranged, that the operation d ~e manually
op~r.-~l valve conta;ned in the delivery n~le ~enerat3~ an ~lecbic signal,
which is taken to a solenoid and which on ~he simulla~ous arri~al of two such
signals closes the upstream valves This causes in elec~ric blocking The
valves contained in tlle delively nozzles could contain a non-return fundion.
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For preference, valves could be constructed in such a manner that they only
open at a ~r~d~t~rl..ined pressure, such as 08 bar, to ensure, that wllen
operating more than one deli~ nozle, no liquid can e~i~ since the
up~ . ., valve is chss~l.
An example of ~e invention is given below with r~r~,~ to the dU~cl.eJ
~_Jr~. ~y~,
Depicted are
Fig. 1 A sche,.-a~ic rq.r~6e.~ , of a dev~ce acc~ding to the
invenbon, wi~ ~e example of a fuel pump for th!ee ~pes of liquid
fuel and
Fig. Z a section ~rouS~h a liquid measurin9 d~vice, according to DE 41
42 062, ~s used in ~e e~mple giv~n in Fig. 1, and
Fig. 3 thc ~l ,e-~-affc r~r~;.e.~labon of a hlr~r example.
Tho liquid measurin~ dsvice 1 co-us sts of a housing 21, contair~ing ~vo
overbpping bores. These cylindric~l bores contain i~t~.. ,..~shing screw
spindbs 20, close fitting to ~e wall of ~e bores, so that liquid, Rc~ through
the ar~--~a~ nt, causos rol~bon of the t HO screw spindles 20. The ends of ~e
spindles aro locatod in bearings One of ~e spindles c~ a generator
wheol 24, designed as pulse generator, which may contain o~te or several
~--agn~t~. The housing contains a sensor 22 which co-operates wl~h ~e signals
generated by the generator wheel 24 by means of a magnotic d~tector, which
conver~ these into electr~cal si$~fials so that they may be fed by cable 23 to ameasuremerrt circuit. In r~s~ of fur~er features of the liquid ~neasurement
device, reference is made to C)E 41 42 ~62. The con~ersion of te2t values and
tl~e display of ~alues of the example correspond to DE 41 52 062, whereby for
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each completed supply link individual cal,~r~tion and conversion parameter for
volume and price display are provid~d on the co.,.,~Gr, d;splay unit.
The refuelling a.~ gel~ given as examplo and as depi~ted in Fig. 1
cGnsisl~ a total of three delivery ~ s 2, 3, 4. Each of th~ d livery nozles
2, S, 4 is conoectecl by means of a hose (not shown) and throu9h valves 13 to
18tothecGr,es,~ord;"y pump5,6,7wi~ ts~soc~ supply~nk8,9, lO.
The outlets of valves 16, 17, 18, dov..~sl.aam of pumps 5, 6, 7, are joined into a
cG~I~rlGn line which feeds in~o ~e cGIl~n~on liquid measuring d~ice 1, so that
on opening valve 18 pump 7 pumps liquid from supply tank 10, on opening of
valve 17 pump 6 pump6 liquid ~rom supply tank 9 and on op ning valYe 16
pump ~i pumps liquid from supply ~nk 8 ff~rough the cc,...r.~l. measuring
device. Valves 16, 17, 18 may never bo G~Cn~ t~gether. Onl~ on~ of these
valves may be open at any one bme. If valve 16 is o~encd, ~hen valve 13
of fuel Ji~n~r 2 opens; If valve 17 is open~J, ~en valve 14
u~h~a.l. of fuel dis~e..s~r 3 opens; If valve 18 is o~an~l, nen ~alve 1~
L~.. of fuel dis,~en~er 4 opens. ~Jalves 13, 14, 15, which tenninab in their
cGr-~,G"dTng hQ~ 6nscr, originate ~om a common ir~ut whlch is
,cc~,c; ~1 wi~ ~e output of ~e liquid ,- a- - ~ring device 1
..
In a spocial v_.~io~, vahres 16, 17J 18 are combined in a common val~e block
12 which is a-.a~,y~.~ as a nlulff-way valve. In like .,.anncr, ~Jal~s 13, 14, 15
could be combined in a valve block 11, which is also e .bad as multi-way
valve. Valves con1ained in tho multi-way valves 11, 12 are swi0ched as pairs,
so fflat ~e liquid measunng Jevice may be u;~ ."e~,l~i into the co, .~ ~,~nding
supply links ~ &r. supply ~nks 8 ~ 10 and del~ve~y n~? ~las 2 to 4.
For preference the volume of the screw spindle counter is belo~/ 20 cm3, for
preference at 13 cm3, so that when, for example, drawing a minirrr~lm of 51. the
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s
clearance volume of the liquid measuring device is less than ~e limits of the
calibration tolerance.
The measuring device 1 is conn~tl3d through a test value converter to adisplay unit to show the volume drawn and ~e co, I~. ,~nding price.
Simultaneous w~h the determina'don and display of ~e volun~ here is the
debrrninaffon and display of ~e price.
Valves 13, 14, 15 may also be non-retum valves or may be contained in U~e
delivery, ~vc~l~s as manually operaL~d valves.
In case of ~e ex~mple of the invention ~, ict ~ in Fig. 3, tNo refuelling units~T1, T2, are connected to each pump 5, 6, 7. There are ~tc$Jetl,er three
pumps, 5, 6, 7, where each pump is provided ~ith a filter unit 2S through which
the liquid, he~ the fuel, is pumped from the c~s,~,~riJing supply t~nk 8, 9,
10. Each pump 5, 6, 7 is ~rc,v;~ad with a non-retum valve 26. 9c~ heam of
each non-re~m valve 26 ~e supply line splits into the ~vo refucllin9 units T1,
T2.
In case of the ex~mple shawn, i~ ely u~sb6a-,. of the li~uid measuring
device there are valves 16, 17, 18 5~55~ with the ap~ropriate fuels.
l.~,n~ ely Jow..~b~a.n of the liquid measuring device no valves are
provided. Instead, ~ .~Pam valves are con~ined in the ~ctual delivery
s 2, 3, 4. Val~res 2, 3, 4 ~re activated by an operatir~o lever o~ the
delively nozte which also operdt~3s an el~hic sw-ltch and which signals k:~ an
ele_b- nic circuit - not shown in the r~ e~ G~ at one of ~e ~ree
delivery ~ozzles 2, 3, 4 has been activated The ebctronlc c~c~it opens the
corre~G..J;..g valve 16, 17 or 18 and stalts up the cGr.espor,dlng pump 5, 6,
or 7 if this is not already operating The manually o,u~ldted valv~s contained in
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the delivery noc~les are biased in such a way, that ~ey will only open under an
a-~ "issio, . pressure of at least 0 8 bar.
If in addition to one delivery nozle being ope~t~d a secG,-- dellvery nozle is
activated, then an electric signal is generabd which is f~d to ~e electronic
circuit. If the cl~t~-~n circuX r~gnises, that ~vo d~ .y ..o~les are being
ac~vated simuttaneously, fflen all upstream valves 16, 17, 18 ar being closed
to ensure, that fuel may be drawn from one ~ell~r~ry ~le o~r at any one
time. With valves 16, 17, 18 clc66~1, pressures in the delive~y hose falls below~e ~--issiGn pressure so ~at ~e manually C6~ valves contained in the
delivery nozles remain closed.
All features ~i3~1G~_d are material to the inven~on. Into ~7e ~ s ~re of tho
application, the full ~;,cloav~e cont~nts of the cc~ rding / ~,~l~d priority
document~ ~copy of earlier applica~on) are ~_...ed to b~ included, including
for ~e plJ",o~e to adopt feabJres contained in such docun~ents into the
~,.~nt application.
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