DE102017121102A1 - Refueling unit - Google Patents

Abstract

The invention relates to a refueling unit (1) having a refueling station (2) which has a storage tank (3) with a filling line (4) and a liquid tank (6) provided outside the refueling station (2), in particular in a model ), in which a supply line (7) opens and to which an overflow (12) is connected. In order to avoid operating errors of the user during the refueling process as far as possible, the refueling unit (1) according to the invention provides that the refueling station (2) has a return line (8) opening in the storage tank (3) that the refueling unit (1, 10 ) has a refueling coupling which has a coupling piece (9) and a coupling counterpart (11) releasably connectable with the coupling piece (9), that the filling line (4) and the return line (8) connected to the coupling piece (9) and the supply line ( 7) and the overflow (12) to the coupling counterpart (11) are connected or connectable, and that in a docked together refueling position of coupling piece (9) and coupling counterpart (11) the filling line (4) with the supply line (7) and the overflow (12) with the return line (8) are liquid-conducting connected (see Fig. 1).

Description

The invention relates to a refueling unit with a refueling station, which has a storage tank with a filling line, as well as with a liquid tank outside the refueling station, in particular in a ship, motor vehicle or aircraft model, in which a supply line opens and at which an overflow connected.

Refueling units of the type mentioned in the introduction are used to refuel ships, motor vehicles or aircraft with the fuel required to operate their fuel drive. The previously known refueling units have for this purpose a regularly portable refueling station, which has a storage tank in which a larger amount of the required fuel is stored. In this case, a subset of the stockpiled in the storage tank fuel can be filled via a filling line in a liquid tank, which is installed in the relevant ship, motor vehicle or aircraft model. The model in question usually has a tank neck located on the outside of the model, which is connected to the liquid tank inside the model via a feed line which opens into the liquid tank. Since it is difficult for the user to recognize whether the liquid tank located inside the model has already been completely filled, an overflow is connected to the liquid tank, via which excess fuel can be discharged again from the liquid tank.

The tank stations required for filling the liquid tanks of remote-controlled ship, motor vehicle or aircraft models usually have a storage tank, which typically consists of a fuel canister with a fuel pump attached thereto. The fuel pump is preferably an electrically operated fuel pump which is operated with an accumulator. Alternatively, manually operated fuel pumps are possible. In order to refuel a model with the previously known refueling units, the following steps are generally necessary:

First, the plug for the tank ventilation on the model must be removed; This tank ventilation is usually located at the lowest point on the bottom of the model. This plug is plugged when not in use or the transport of the model to prevent dripping of fuel. In a subsequent step, connect the filling line to the refueling nozzle on the model. In addition, any existing stopcock on the model is still open. This stopcock is to prevent that during operation optionally air can be sucked into the liquid tank or the fuel supply of the model drive via the supply line, which would then lead to interruptions in the fuel supply and possibly to the failure of the model drive. After the line connection between the refueling station and the liquid tank has been made in the model, the refueling operation is started by manually switching on the fuel pump. This will deliver fuel from the refueling station into the liquid tank of the model. The air in the fuel tank of the model escapes through the tank ventilation. As far as the liquid tank in the model is completely filled, the fuel or fuel flows out of the model via the tank ventilation. Running out of fuel or fuel is an indication to the user that the liquid tank in the model is full and the fuel pump has to be shut down. In order to prevent dripping of the fuel, the refueling pump is then usually operated a few seconds backwards to reduce excess pressure in the liquid tank and to prevent or stop the dripping of fuel. After these above steps, the ship, vehicle or aircraft model is ready to be put into operation.

However, if the user forgets to remove the sealing plug on the tank ventilation before starting the refueling process, a very high overpressure may form during refueling in the liquid tank of the model. This overpressure usually causes either the fuel hoses built into the model to burst or pop off, or, more likely, the fluid tank bursts in the model itself. In both cases, there is a risk that larger amounts of, for example, 0.5 to 10 liters of fuel can run on the ground and thus into the environment. At the end of the refueling process, the user must keep a close watch on the neck of the tank overflow to visually detect fuel leakage when the maximum capacity of the liquid tank is reached, and then shut down the fuel pump immediately. If the user is distracted or the view of the overflow port is restricted, it is possible that fuel will flow to the floor until the pump is finally shut down by the user. Failure to close the model-side stopcock after the refueling operation may result in air being drawn into the liquid tank during operation leading to failure of the model drive.

There is therefore in particular the task of creating a refueling unit of the type mentioned, which excludes operator error as far as possible.

The achievement of this object is in the refueling unit of the type mentioned in particular that the refueling station has a recirculating line in the reservoir, that the refueling unit has a refueling coupling, a coupling piece and a releasably connectable to the coupling piece coupling counterpart has that the filling line and the return line connected in the refueling station to the coupling piece and the supply line and the overflow are connected to the coupling counterpart or connectable thereto, and that in a coupled refueling position of coupling piece and counterpart coupling the filling line with the supply line and the overflow with the return line are connected liquid leading.

The refueling unit according to the invention is provided for refueling the liquid or fuel tank located in a ship, motor vehicle or aircraft model. The refueling unit according to the invention has a preferably portable refueling station, which has a storage tank for a fuel or similar liquid supply. This storage tank is connected to a filling line leading to the model. Outside the refueling station and in particular in the relevant model, in turn, a liquid or fuel tank is provided, in which a supply line opens and to which an overflow is connected. According to the invention, it is provided that the refueling station of the refueling unit has a return line opening into the storage tank. Over this return line excess fuel or the like liquid can be returned to the storage tank before this fuel expires unused over the overflow on the liquid tank in the model and seeping into the ground and thus into the environment. The refueling unit has a refueling coupling which has a coupling piece connected to the refueling station and a coupling counterpart provided on the model and releasably connectable with the coupling piece. The filling line and the return line are connected at the refueling station to the coupling piece, while the supply line and the overflow are connected to the coupling counterpart or connectable thereto. In a docked together refueling position of coupling piece and coupling counterpart the filling line with the supply line and the overflow are connected to the liquid-conducting return line. Thus, the fuel stored in the storage tank can be filled via the filling line in the tank station and then via the supply line in the model there into the liquid tank. At the same time, the overflow from the liquid tank of the model to the return line in the refueling station is liquid-conducting connected, so that leakage of excess fuel is prevented and the excess fuel instead can be returned to the storage tank. In this way, operator errors can be avoided.

In order to connect the coupling piece and the coupling counterpart of the refueling coupling with each other, it is advantageous if the coupling piece and the counterpart coupling piece via a rotary, plug or plug / rotary movement are releasably connected to each other.

In this case, a preferred embodiment according to the invention provides that the coupling piece and the counterpart coupling piece via a bayonet or Renkverbindung are releasably connected to each other.

In order to avoid further operating errors during refueling operation, it is advantageous if a first valve is interposed in the supply line, which connects the filling line to the supply line in a first valve position. Since in the supply line in the model, a first valve is interposed, can be dispensed with the closure of a refueling nozzle by means of a screw or the like plug.

An embodiment according to the invention provides that the first valve switches to its second valve position when the coupling piece and the coupling counterpart are detached from each other. It may be advantageous if the first valve in this second valve position is in its closed position.

It is also possible that the first valve in a second valve position connects the liquid tank located in the model with an internal combustion engine also provided in the model.

In order to be able to dispense with the closing of a model of the liquid tank associated tank ventilation, it may be advantageous if the overflow is associated with a second valve which connects the overflow in a first valve position with the return line. Thus, the overflow on the liquid tank of the model is connected via the second valve to the return line in the refueling station so that fuel exiting the overflow in the model via the second valve located in the first valve position and the return line in the refueling station in the refueling station provided storage tank can flow back.

On the other hand, if the coupling piece is uncoupled from the coupling counterpart and the refueling coupling is released, it is advantageous if the second valve in a second valve position connects the overflow to the tank ventilation. Because of the tank ventilation and the overflow thus air in the Liquid tank of the model may occur, a negative pressure in the liquid tank is counteracted when the model drive sucks the required fuel from the liquid tank.

If an internal combustion engine is installed in the model, which in contrast to a turbine serving as a model drive does not regularly have its own supply valve, it is advantageous if a third valve is provided, which is in its first valve position in a closed position and in its second Closed position connects the liquid tank via the also located in its second valve state first valve with an internal combustion engine.

A preferred embodiment according to the invention provides that in the conduction path between the located in its second valve position second valve and the tank ventilation a vent valve is interposed, which is closed in its first valve position, and that the second valve in its second valve position overflow over which also connects in a second valve position located ventilation valve with the tank ventilation.

To counteract further operating errors of the user, a development according to the invention provides that the valve or the valves switch to their first valve position or switch when the coupling piece and the coupling counterpart were joined together in their refueling position and that the valve or the valves in their the second valve position switches or switch when the coupling piece and the coupling counterpart are decoupled from each other. In this further embodiment, the correct connection of the lines provided in the refueling unit is accomplished virtually automatically via the valves, and sealing plugs on the tank ventilation or on the supply line of the model can be dispensed with.

The refueling station of the refueling unit according to the invention may have a manually operable liquid pump. An embodiment is preferred in which the liquid pump is interposed in the filling line of the tank station. In order to make it even easier for the user to operate the refueling unit according to the invention, it is advantageous if the fluid pump is a fluid pump which is preferably operated electrically via a rechargeable battery.

In this case, a particularly easy-to-handle embodiment according to the invention provides that in the return line of the tank station, a liquid sensor is interposed, which triggers a shutdown of the liquid pump when the liquid sensor detects liquid in the return line.

The coupling of the fueling station on the model is greatly simplified if the coupling counterpart is formed on the outside of the model as a mountable refueling can.

It is particularly advantageous if the valve or the valves are provided in the coupling counterpart.

It provides a structurally particularly simple and easy to handle embodiment according to the invention that the coupling counterpart has two valve disks rotatable relative to each other, between which valve disks, the valve or the valves are formed, wherein the valve or the valves by relative rotation of the valve disks of a valve position can be switched to the other valve position.

In this case, the coupling piece can have two connecting pins, one of which connecting pin is connected to the filling line and the other connecting pin with the return line. These connection pins can be inserted into connection openings in one of the valve disks, which connection openings are connected or connectable to the valve or the valves. By inserting the connection pin in the connection openings, a liquid-tight and simultaneously non-rotatable connection between the coupling piece and the valve disc having the connection openings is produced. By a rotary, plug and in particular a plug / rotary movement on the coupling piece, which is necessary for connecting the coupling piece and coupling counterpart, and the connection openings having valve disc is rotated, which at the same time provided between these valve discs valves from its second valve position in the the refueling position corresponding first valve position are moved.

In a further embodiment, it is provided that the provided on the coupling counterpart two connection openings can be "shorted" with a plug-in coupling with bridging hose, so that the tank overflow in the first valve position of the valves located in the coupling counterpart is connected to the feed line leading to the liquid tank. The use of this further embodiment is particularly suitable for transporting the ship, motor vehicle or flight model.

Further developments according to the invention will become apparent from the drawings in conjunction with the claims and the description. below the invention will be described in more detail with reference to preferred embodiments.

• 1 den schematischen Aufbau einer Betankungs-Einheit, die zum Betanken eines, eine Turbine aufweisenden Flugmodells bestimmt ist, wobei die Betankungs-Einheit eine Betankungskupplung aufweist, die eine vorzugsweise tragbare Tankstation der Betankungs-Einheit mit einem Flüssigkeitstank im Modell verbindet, und wobei sich diese Betankungskupplung hier in ihrer Betankungsposition befindet,
• 2 die Betankungs-Einheit aus 1 in der abgekoppelten Position ihrer Betankungskupplung,
• 3 die Betankungs-Einheit aus den 1 und 2 in einer Transportstellung, in welcher Transportstellung eine zum Flüssigkeitstank des Modells führende Zufuhrleitung und ein am Flüssigkeitstank des Modells vorgesehener Überlauf miteinander über einen Überbrückungsschlauch „kurzgeschlossen“ sind,
• 4 eine Betankungs-Einheit, die hier zum Betanken eines im Modell befindlichen Verbrennungsmotors bestimmt ist, wobei die Betankungs-Einheit hier in der von einer Tankstation abgekoppelten Position ihrer Betankungskupplung dargestellt ist, wobei die in den 1 bis 4 schematisch dargestellten Betankungs-Einheiten lediglich im Bereich ihrer am oder im Modell befindlichen Bestandteile gezeigt sind,
• 5 ein an der Außenseite eines Modells montierbares Kupplungsgegenstück einer Betankungskupplung in einer perspektivischen Draufsicht auf die Unterseite des Kupplungsgegenstücks,
• 6 das Kupplungsgegenstück aus 5 in einer perspektivischen Draufsicht auf dessen Anschlussseite,
• 7 ein dem Kupplungsgegenstück aus 5 und 6 zugeordnetes Kupplungsstück der Betankungskupplung in einer perspektivischen Draufsicht auf die anschlussseitige Stirnseite des Kupplungsstücks,
• 8 das Kupplungsstück aus 7 in einer auseinandergezogenen Perspektivdarstellung seiner Bestandteile, und
• 9 die Tankstation der in den 1 bis 4 gezeigten Betankungs-Einheiten.

It shows:

• 1 the schematic structure of a refueling unit, which is intended for refueling a turbine model having a refueling, wherein the refueling unit has a refueling coupling, which connects a preferably portable refueling unit tank station with a liquid tank in the model, and wherein this refueling coupling here in her refueling position,
• 2 the refueling unit off 1 in the decoupled position of its refueling coupling,
• 3 the refueling unit from the 1 and 2 in a transport position, in which transport position a supply line leading to the liquid tank of the model and an overflow provided on the liquid tank of the model are "short-circuited" to one another via a bridging hose,
• 4 a refueling unit, which is intended here for refueling an in-model combustion engine, wherein the refueling unit is shown here in the decoupled from a refueling station position of their refueling coupling, wherein in the 1 to 4 schematically shown refueling units are shown only in the area of their on or in the model components,
• 5 a coupling counterpart of a refueling coupling which can be mounted on the outside of a model in a perspective plan view of the underside of the coupling counterpart,
• 6 the coupling counterpart 5 in a perspective top view on its connection side,
• 7 a the clutch counterpart 5 and 6 associated coupling piece of the refueling coupling in a perspective plan view of the connection-side end face of the coupling piece,
• 8th the coupling piece 7 in an exploded perspective view of its components, and
• 9 the refueling station in the 1 to 4 refueling units shown.

In the 1 to 4 are refueling units 1 . 10 shown, which are used to refuel a ship, motor vehicle or a flight model. The refueling units 1 . 10 have an in 9 Tanker station shown in detail 2 put on a storage tank 3 with a filling line 4 Has. In the filling line 4 the preferably portable configured refueling station 2 is a pump 5 interposed, which may be formed as a manually operable liquid pump, but here preferably a powered via a entrained battery electric liquid pump 5 is.

In the 1 to 4 are the refueling units 1 . 10 shown only in the area of their mounted on or in the model components. In contrast, the refueling station 2 the refueling units 1 . 10 in 9 shown. While in the 1 to 4 the dashed outer frame surrounds the components located in the model, the contrast dashed lines shown in the interior is on the schematic structure of the coupling counterpart 11 the refueling units 1 . 10 limited.

From a close look at the 1 to 4 it becomes clear that the refueling unit 1 . 10 also outside the refueling station 2 and, in particular, a liquid tank provided in a model 6 heard in which a supply line 7 flows and at which an overflow 8th connected.

In 9 it is recognizable that the refueling station 2 one in the storage tank 3 opening return line 8th has and that the refueling unit 1 . 10 a refueling coupling having a coupling piece 9 and one with the coupling piece 11 releasably connectable coupling counterpart 10 having. Here is the coupling piece 9 with the refueling station 2 connected while the coupling counterpart 11 mounted on the outside of the model. The filling line 4 and the return line 8th in the refueling station 2 are to the coupling piece 9 connected. In contrast, the supply line located in the model 7 as well as the overflow 12 to the coupling counterpart 11 connected or connectable. In a docked refueling position of coupling piece 9 and coupling counterpart 11 is the filling line 4 with the supply line 7 and the overflow 12 with the return line 8th fluid-conducting connected. In this way, a subset of the tank in the storage tank 2 stockpiled fuel through the liquid pump 5 and the supply line 7 in the liquid tank in the model 6 be pumped. This is a possible excess in the liquid tank 6 about its overflow 2 and the connected return line 8th the refueling station 2 in the storage tank 3 without fear of an undesirable escape of fuel from the model and infiltration of this excess fuel into the soil and thus into the environment must be feared.

From a comparison of 1 to 4 it becomes clear that in the supply line 7 a first valve 13 is interposed that in a first, in 1 shown valve position, the refueling position of the coupling piece 9 and coupling counterpart 11 existing refueling coupling corresponds to the filling line 4 with the supply line 7 combines. The first valve 13 switch to his in 2 shown second valve position to when the coupling piece 9 and the coupling counterpart 11 be solved from each other. In this case, the second valve position of the first valve corresponds 13 at the refueling unit 1 according to the 1 to 3 the closed position of this valve 13 ,

In contrast, in the refueling unit 10 according to 4 provided that the first valve 13 in its second valve position, the liquid tank 6 with an internal combustion engine 14 combines.

The overflow in the model 12 can be a second valve 15 be assigned, which is the overflow 12 in a first valve position of the second valve 15 with the return line 8th combines. In contrast, the second valve connects 15 in its second valve position, the overflow with a preferably located at the bottom of the model tank ventilation 16 ,

At the refueling unit 10 is a third valve 17 provided, which is in its first valve position in a closed position and in its second closed position, the liquid tank 6 via the also located in its second valve position first valve 13 with the internal combustion engine 14 combines.

Since the turbines, which are customary in model construction, already have a built-in supply valve which can also open and close automatically if necessary, this is the case for the turbine 28 provided refueling unit 1 the third valve 17 not mandatory.

In the conduction path between the second valve located in its second valve position 15 and the tank ventilation 16 is a vent valve 18 interposed, which is closed in its first valve position, wherein the second valve 15 in its second valve position the overflow 12 via the ventilation valve also located in its second valve position 18 with the tank ventilation 16 combines.

The valves 13 . 15 . 18 and optionally 17 are in the refueling coupling and in particular in the model located on the coupling counterpart 11 integrated. These valves can be 13 . 15 . 17 and 18 switch to their first valve position when the coupling piece 9 and the coupling counterpart 11 be connected in their refueling position, while the valves 13 . 15 . 17 and 18 switch to its second valve position when the coupling piece 9 and the coupling counterpart 11 be decoupled from each other.

This is in the 5 and 6 closer coupling counterpart shown 11 formed as mounted on the outside of the model refueling can. The coupling counterpart has two, in the refueling can relative to each other rotatable valve discs 19 . 20 on, between which valve discs 19 . 20 the valves 13 . 15 . 17 and 18 are formed. From the 7 to 9 it becomes clear that the coupling piece 9 two connecting pins 21 . 22 has, of which a connecting pin 21 with the filling line 4 and the other connecting pin 22 with the return line 8th in the refueling station 2 connected is. These connection pins 21 . 22 on the coupling piece 9 are in connection openings 23 . 24 in the valve disc 19 used. Because the coupling piece 9 and the coupling counterpart 11 over a bayonet groove 26 and bayonet projection 27 existing bayonet connection can be coupled together and since this bayonet connection requires a plug / rotary connection, is when inserting the connecting pin 21 . 22 in the connection openings 23 . 24 at the same time a non-rotatable connection with the valve disc 19 produced. By the subsequent rotation of the coupling piece 9 in the bayonet connection with the coupling counterpart 11 becomes the valve disc 19 relative to the valve disc 20 twisted so that the between these valve discs 19 . 20 provided valves 11 . 13 . 18 and optionally 17 simultaneously also move from its second valve position in each case in their first valve position corresponding to the refueling position. When releasing the coupling piece 9 from the coupling counterpart 11 becomes the valve disc 19 opposite the valve spool 20 moved back and the valves 13 . 15 . 17 and 18 switch from their first valve position back to the second valve position.

In the 1 to 3 and 5 to 6 are the on the coupling piece 11 provided with " F "For" full ", with" D "For" drain ", with" O "For" overflow "and possibly with" M Marked for "motor". In this case, the hose nozzle F with the supply line 7 , the hose nozzle D with the tank ventilation 16 , the hose nozzle O with the overflow pipe 12 and optionally one in the 5 and 6 not shown hose nozzle M with the between the third valve and the internal combustion engine 14 connected line connected.

The refueling coupling of the refueling units shown here 1 . 10 has that coupling 9 and the coupling counterpart 11 as a coupling partner. While on the coupling piece 9 the filling line 4 and the return line 8th the refueling station 2 is connected, contains the model to be mounted in the coupling counterpart 11 the integrated valve function. The coupling piece 9 is over a total of two tubes 4 . 7 and preferably via a twin tube to the refueling station 2 connected. The filling line is doing this 4 the connection to the storage tank 3 the refueling station 2 ago. The also with the coupling piece 9 connected return line 8th is at the top of the storage tank 3 the refueling station 2 connected so that escaping fuel back into the storage tank 3 the refueling station 2 can flow back. About this return line 8th If necessary, overflowing fuel is transferred from the model to the storage tank 3 the refueling station 2 returned.

In ship, motor vehicle or aircraft model is preferably designed as a refueling coupling counterpart 11 installed, in which the valves 13 . 15 . 18 and optionally 17 integrated and that via a bayonet connection with the coupling piece 9 is detachably connectable. Now the coupling piece 9 in the coupling counterpart attached to the model 11 plugged in and coupled there, so are the filling line 4 with the supply line 7 and the overflow 12 with the return line 8th connected. The coupling process between coupling piece 9 and coupling counterpart 11 also switches the in the clutch counterpart 11 integrated valves in the first valve position such that now that in the coupling counterpart 11 integrated first valve 13 is open, the filling line 4 the refueling station 2 with the filling port of the liquid tank in the model 6 is connected and the overflow 12 to the storage tank 3 the refueling station 2 leading return line 8th connected.

All this happens automatically as soon as that with the refueling station 2 connected coupling piece 9 with the model-side coupling counterpart 11 connected is. The refueling unit 1 . 10 is now ready for refueling. At the end of the refueling process, excess fuel may no longer be released into the atmosphere, and in particular no longer into the ground, but back into the storage tank 3 the refueling station 2 directed. Even if the refueling process is not stopped in time by the user, fuel can no longer overflow because it always returns to the storage tank 3 is directed. In addition, opening the tank ventilation 16 Do not forget, since the tank ventilation 16 automatically with the return line 8th to the refueling station 2 is connected. A burst of the liquid tank in the model 6 and an associated leakage of fuel is prevented.

If the refueling coupling is decoupled and their coupling piece 9 as well as the coupling counterpart 11 separated from each other, so are the one from the refueling station 2 incoming filling line 4 from the model-side coupling counterpart 11 disconnected and the Abkoppelvorgang also switches in the coupling counterpart 11 integrated valves 13 . 15 . 18 and optionally 17 each in their second valve position such that now that in the coupling counterpart 11 integrated first valve 13 is closed and a suction of air into the liquid tank 6 or leading to the model drive fuel supply system is prevented. At the same time is the overflow 12 on the liquid tank 6 of the model with the open ventilation valve 18 connected to the model. The circuit of the valves 13 . 15 . 17 and 18 takes place automatically as soon as that with the refueling station 2 connected coupling piece 9 from the model-side coupling counterpart 11 disconnected and separated.

In 3 is still shown that the refueling unit according to the invention 1 as a special function a separate transport coupling piece 9 ' may have, in which the connecting pin 21 . 22 connected by a bridging tube. This transport coupling counterpart provided as a special function 9 with bridging hose 25 can be used to transport the model. Here, the serving as refueling nipple connection pin 21 with the otherwise serving as a return nipple connection pin 22 over a short piece of hose 25 connected. The entire fuel system in the model is hermetically sealed and also the tank ventilation 16 The model is also closed.

LIST OF REFERENCE NUMBERS

1

Refueling unit (according to 1 to 3 )

2

tank station

3

storage tank

4

filling line

5

liquid pump

6

liquid tank

7

supply line

8th

Return line

9

coupling

9 '

Transport-coupler

10

Refueling unit (according to 4 )

11

Coupling counterpart

12

overflow

13

first valve

14

internal combustion engine

15

second valve

16

tank breather

17

third valve

18

vent valve

19

valve disc

20

valve disc

21

connection thread

22

connection thread

23

port opening

24

port opening

25

jumper hose

26

bayonet groove

27

bayonet lead

28

turbine

Claims (19)

Refueling unit (1, 10) with a refueling station (2) having a storage tank (3) with a filling line (4) and with a liquid tank (6) provided outside the refueling station (2), in particular in a model, in which a supply line (7) opens and to which an overflow (12) is connected, characterized in that the refueling station (2) has a return line (8) opening in the storage tank (3), that the refueling unit (1, 10 ) has a refueling coupling which has a coupling piece (9) and a coupling counterpart (11) releasably connectable with the coupling piece (9), that the filling line (4) and the return line (8) connected to the coupling piece (9) and the supply line ( 7) and the overflow (12) to the coupling counterpart (11) are connected or connectable, and that in a coupled together refueling position of coupling piece (9) and coupling counterpart (11) the filling line (4) with the supply line (7) and Ü Overflow (12) with the return line (8) are liquid-conducting connected. Refueling unit after Claim 1 , characterized in that the coupling piece (9) and the coupling counterpart (11) via a rotary, plug or plug / rotary movement are releasably connected to each other. Refueling unit after Claim 1 or 2 , characterized in that the coupling piece (9) and the coupling counterpart (11) via a bayonet or Renkverbindung are releasably connected to each other. Refueling unit according to one of the Claims 1 to 3 , characterized in that in the supply line (7) a first valve (13) is interposed, which connects the filling line (4) with the supply line (7) in a first valve position. Refueling unit according to one of the Claims 1 to 4 , characterized in that the first valve (13) switches to a second valve position when the coupling piece (9) and the coupling counterpart (11) are detached from each other. Refueling unit after Claim 5 , characterized in that the second valve position of the first valve (13) corresponds to its closed position. Refueling unit after Claim 5 , characterized in that the first valve (13) connects the liquid tank (6) with an internal combustion engine (14) in its second valve position. Refueling unit according to one of the Claims 1 to 7 , characterized in that the overflow (12) is associated with a second valve (15), which (15) connects the overflow (12) in a first valve position with the return line (8). Refueling unit after Claim 8 , characterized in that the second valve (15) connects the overflow (12) with a tank ventilation (16) in a second valve position. Refueling unit according to one of the Claims 1 to 9 , characterized in that a third valve (17) is provided, which is in its first valve position in a closed position and in its second valve position the liquid tank (6) via the also located in its second valve position first valve (13) with a Combustion engine (14) connects. Refueling unit according to one of the Claims 1 to 10 , characterized in that in the conduction path between the located in its second valve position second valve (15) and the tank ventilation (16) a vent valve (18) is interposed, which is closed in its first valve position, and that the second valve (15) in its second valve position the overflow (12) via the likewise located in its second valve position ventilation valve (18) connects to the tank ventilation (16). Refueling unit according to one of the Claims 1 to 11 , characterized in that the valve or valves (13, 15, 17, 18) switch to their first valve position when the coupling piece (9) and the coupling counterpart (11) are connected together in their refueling position, and in that the valve or the Valves in their second Switch valve position when the coupling piece (9) and the coupling counterpart (11) are decoupled from each other. Refueling unit according to one of the Claims 1 to 12 , characterized in that in the filling line (4) of the tank station (2) a liquid pump (5) is interposed. Refueling unit after Claim 13 , characterized in that the liquid pump is a, preferably via an accumulator operated electric fluid pump. Refueling unit according to one of the Claims 1 to 14 , characterized in that in the return line (8) of the tank station (2) a liquid sensor is interposed, which triggers a shutdown of the liquid pump (5) when the liquid sensor in the return line (8) detects liquid. Refueling unit according to one of the Claims 1 to 15 , characterized in that the coupling counterpart (11) is designed as a refueling can, which is mounted on a model. Refueling unit according to one of the Claims 1 to 16 , characterized in that the valve or the valves (13, 15, 17, 18) are provided in the coupling counterpart (11). Refueling unit according to one of the Claims 1 to 17 , characterized in that the coupling counterpart (11) has two valve disks (19, 20) rotatable relative to one another, between which valve disks (19, 20) the valve or the valves (13, 15, 17, 18) are formed. Refueling unit after Claim 18 , characterized in that the coupling piece (9) has two connecting pins (21, 22), of which one connecting pin (21) is connected to the filling line (4) and the other connecting pin (22) is connected to the return line (8) and in that Connecting pins (21, 22) in connection openings (23, 24) in one of the valve discs (19) are used, which connection openings (23, 24) with the valve or the valves (13, 15, 17, 18) are connected or connectable.

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