DE102006059967A1 - Suction-pipe venturi nozzle for motor vehicle saddle fuel tank, has float valve arranged inside suction pipe - Google Patents

Abstract

A suction pipe for sucking a liquid comprises a feed branch for drawing off the liquid, and further comprises a float valve arranged in the interior of the suction pipe which closes the feed branch when the liquid is at a low level. Independent claims are included for the following. (1) (A) A venturi nozzle (2) (B) A fuel container for motor vehicle.

Description

The Invention relates to a Venturi nozzle, one of the Venturi nozzle assigned and structurally adapted to her suction tube and a Fuel tank with this Venturi nozzle and possibly this intake manifold.

saddle tanks for motor vehicles are well known. You own a first chamber, because of a Saddle is hydrodynamically decoupled from a second chamber. To use the fuel in both chambers, must for each chamber a corresponding device for conveying fuel to the calming pot or in the other chamber are provided, for example, depending on a pump or one Venturi nozzle each. The same applies to large-area fuel tanks with only one chamber, for example. If the bottom is rugged or uneven. Also in In this case the fuel has to be over various pumps or Venturi nozzles are pumped.

It is an object of an embodiment of the Invention, a Venturi nozzle to provide even one copy sufficient to fuel out a large tank or to convey both chambers of a saddle tank to the sedative pot.

A Another object is to provide egg nes such fuel tank, z. B. in training as a saddle tank.

The solution These objects are achieved by the features of the independent claims. advantageous Developments and other embodiments result dealing with the characteristics of dependent Claims.

A first aspect of the invention relates to a Venturi nozzle. This includes an inlet which is connected to a first tube for supplying liquid as well as
an outlet fluidly connected to a second tube. Between the first and the second tube is a cross-sectional constriction, which is connected to a first inlet intake in such a way as to supply liquid. A feed line connected or connectable to a second intake manifold leads to the mouth region of the first tube.

at Use of the Venturi nozzle flows Liquid, For example, a fuel such as gasoline or diesel, by the Inlet into the first pipe. As usual with a Venturi nozzle it in the transition area between the first and the second tube one (at least locally) narrowest point or a cross-sectional constriction for the flowing liquid. Be cylindrical Tubes chosen, so lies in the cross-sectional constriction of a reduced diameter in front. This can be realized so that the first pipe end or on the exit side a rejuvenation so that it ends over a nozzle features.

To passing the cross-sectional constriction, the liquid passes in the second tube, the so-called expansion tube. In this increases the cross-sectional area for the flowing liquid, before this the Venturi nozzle leaves through the outlet.

One Area between the outlet of the first tube and the inlet opening of the second tube is further liquid feeding with connected to a first intake. Since the said area at the cross-sectional constriction is, there prevails a negative pressure during operation, for sucking in liquid, z. As fuel, over the first intake manifold can be used. The said area is therefore a negative pressure area during operation.

Farther owns the Venturi nozzle a supply line to the mouth area of the first pipe. The supply line is either with a second intake manifold connected or is connectable with this.

The called Venturi nozzle has two options a liquid to suck on: over the first intake manifold or over the supply line, the latter possibly supplemented with a second intake manifold. This provides the opportunity over the first intake manifold to draw fuel from a first point of the fuel tank and over the supply of fuel from a second location to a calming pot to promote. This is helpful when using a small volume of fuel from a fuel tank with big ones Floor space, especially if it has bumps. It is in total only a single Venturi nozzle required to fuel from the two places of the fuel tank to To promote engine. This saves a venturi compared to the prior art. Furthermore, hose connections for the realization of a second Return line from the engine or a second circuit to operate a second venturi saved.

The venturi also offers the possibility Fuel from the first chamber of a saddle tank over the suck in first intake and fuel from the second chamber via the Supply line to the first chamber (or vice versa) or alternatively directly to promote a calming pot. separate venturi nozzle or pumps for both chambers of the saddle tank are no longer necessary.

Furthermore, the said embodiment dispenses with the introduction of a second flange into the tank top shell of the saddle tank, which is otherwise necessary for the introduction of the second venturi nozzle into the tank interior and its attachment to the tank bottom would be required.

In a further embodiment a third pipe picks up and defines the first pipe in its interior the gap between them is part of the Feed. The third tube has a view in the direction of flow a muzzle, the coincides with that of the first pipe. The third pipe can be integrally formed on the first tube and with this cost as Unit be made, for. B. by injection molding. It can also be coaxial be arranged to the first tube. Without additional cost thereby the Venturi nozzle conferred another functionality become.

at an embodiment is further provided that the supply line at least one switching means is associated with those of the cross-sectional constriction either liquid from the inlet or from the second intake can be supplied.

At the Promote of liquid, For example, fuel from two chambers can be achieved by the switching means Be that only by one of the two fluid supplies liquid flows (= active) and over the other liquid supply no Air is sucked in, which leads to a lower efficiency of the venturi or leads to malfunction. If the switching means are actuated, so the other liquid supply is activated.

Further is an embodiment provided, the switching means for an automatic feeder of liquid has either from the inlet or from the second intake manifold to the cross-sectional constriction. This can be a natural priority when sucking in liquid be respected. For example, if the venturi is in the first chamber a saddle tank over the first intake manifold is pumped out, and serves the second intake manifold the emptying of the second chamber, so may by this embodiment guaranteed be that first the second chamber is pumped out before fuel is conveyed from the first chamber to the engine.

One Second aspect of the invention relates to a suction pipe for the suction a liquid. This includes a delivery nozzle for discharging the liquid, and further a float valve disposed inside the intake manifold, that at a low liquid level closes the delivery pipe in the intake manifold.

The said suction tube has a tailored to the above Venturi nozzle Switching means for an automatic supply of liquid either from the inlet of the Venturi nozzle or from the second intake port of the Venturi nozzle to its cross-sectional constriction. Through the float valve is at a small capacity closed in the suction tube receiving chamber of the delivery nozzle. is the delivery pipe the suction pipe connected to the supply line of the Venturi nozzle described above, so will by closing a liquid and air supply to the mouth the Venturi nozzle the Venturi nozzle only blocks and sucks liquid over the first intake manifold on. For a larger capacity in the intake manifold of the Float switch the opening of the delivery nozzle free. In this case, liquid will from the delivery pipe promoted to the outlet and depending on the interpretation, a small percentage by the first Intake manifold. Separate actuating means for opening and close of the delivery nozzle are therefore expendable.

at an embodiment the suction pipe is over pulled a two-ply fabric hose from its inlet.

With the fabric tube becomes the liquid sucked in several places at the same time and optionally flat. This is because when wetting the fabric tube through the liquid in the tank a closed liquid layer can form between the two layers of the fabric tube. These Liquid layer results at a suitable mesh size and thread thickness of Fabric hose by cohesion as well through adhesion the liquid on the fabric hose. It forms so to speak a closed acting coat, through which the fuel even at only partial Location below the liquid level can be sucked by the negative pressure from the Venturi nozzle. With several suction points or more flat Intake can also be a tank with obliquely arranged tank bottom at suitable laying of the fabric hose on the tank bottom completely pumped out become.

The elected Mesh size allowed not too big so that the fabric hose still as a filter for in the tank liquid solid particles present, e.g. As dirt particles or grains of sand act can. If the mesh size is too small, so on the one hand, a suitable negative pressure in Fabric hose, with which there is also a difference in height between the intake manifold and overcome tank bottom leaves. On the other side leads too small a mesh size too to a faster blockage of the fabric tube through the top mentioned solid impurities. A filter fabric has proven itself made of polyamide with monofilament threads.

Further features and advantages of the claimed invention will become apparent from the following de Detailed description with reference to the accompanying drawings, which are given below as non-limiting examples. Here, the use of reference numerals in the figures should not be understood to the effect that the reference numerals are intended to limit the scope of the claimed invention. Show it:

1 an embodiment of the Venturi nozzle in a schematic side view,

2a to,

2 B a suction tube in two operating positions in the schematic side view,

3 a saddle tank in a schematic representation.

In the figures, which generally denote like objects with like reference numerals, shows 1 a Venturi nozzle 1 with a first pipe 2 that with an inlet 3 connected is. The first pipe 2 has a dot-dashed symmetry axis 4 and tapers to a nozzle opening 5 , Left of the first pipe 2 there is a second pipe 6 , the expansion tube that has an outlet 7 has.

In operation, for example, fuel flowing back from the engine flows to the inlet 3 and after a deflection area 8th horizontally to the left to the mouth area 9 of the first pipe 2 , From there, the fuel flows over the inlet opening 10 in the second tube 6 that with the outlet 7 connected is.

The diameter of the nozzle opening 5 is smaller than that of the entrance opening 10 , As a result, this operation results in the formation of a negative pressure area during operation 11 , This causes fuel from the first intake manifold 12 sucked off and entrained by the fuel flow.

The first pipe 2 is from a third pipe 13 surround. The gap between them defines a feed line 14 that the mouth area 9 with a second intake manifold 15 combines. In the 1 is the intake manifold 15 on a vacuum hose 16 drawn.

The Venturi nozzle 1 of the 1 has two intake manifolds 12 and 15 , which make it possible to empty a fuel tank via two suction points. For example, can be with the venturi 1 empty two chambers of a saddle tank by the intake manifold 12 the first chamber and with the intake manifold 15 the second chamber is emptied, cf. 3 , In this respect, an additional venturi nozzle or an additional pump is saved. Furthermore, corresponding supply lines are saved to the other venturi, z. B. a return for fuel from the engine.

The 2a and 2 B show a suction pipe 17 in two different operating positions, on the one hand in a page representation ( 2a left or 2 B right) or looking in the direction of its axis of symmetry 18 , The suction tube 17 has a delivery nozzle 19 that is above the vacuum hose 16 with the second intake manifold 15 the supply line 14 the Venturi nozzle 1 can connect, cf. also 3 , Inside the suction tube 17 there is a float valve 20 , This includes a rotatable about the axis 21 stored lever 22 , one at one end with a clip 23 clipped floats 24 has, for example, can be made of nitrophyl as a fuel-resistant material. There is little or no fuel in the intake manifold 17 , it is according to 2a the swimmer 24 below and will the delivery pipe 19 over at the end of the jib 25 arranged seal 26 , which may consist of silicone or rubber, sealed. With fuel in the intake manifold 17 the swimmer is swimming 17 on, with the opening of the delivery nozzle 19 is released.

Around the left end of the suction tube 17 is a double-layer fabric hose 28 inverted, the z. B. with a hose clamp 27 is attached. At the fabric hose 28 it is a fine-meshed PA6.6 tube made of two layers. The filter fabric consists of monofilament threads. The chain is formed by about 10 threads per centimeter with a thread thickness of 0.15 mm and the shot of about 50 threads per centimeter with a thread thickness of 0.2 mm. The fabric hose allows it, via the suction tube 17 to suck fuel over a large area or more suction points, thereby emptying the fuel tank 29 becomes more efficient.

From the intake manifold 17 then passes over the hose 16 as well as the supply line 14 Fuel to the mouth area 9 the Venturi nozzle 1 when in the chamber K2 of the saddle tank 29 enough fuel is contained to float, cf. 3 , If the chamber K2 is empty, so is the intake manifold 12 fuel is discharged from chamber K1 into the settling pot 30 promoted.

Even though above specific embodiments The person skilled in the art will recognize that the description these embodiments does not have the purpose to limit the invention in the form specified. The Rather, the invention is intended to cover all modifications, equivalents and alternatives which fall within the scope of the claimed invention.

1

venturi

2

first pipe

3

inlet

4

axis of symmetry

5

nozzle opening

6

second pipe

7

outlet

8th

deflection

9

mouth area

10

inlet opening

11

Under pressure range

12

intake

13

third pipe

14

supply

15

second intake

16

Vacuum hose

17

suction tube

18

axis of symmetry

19

feed nozzle

20

float valve

21

axis

22

lever

23

clip

24

swimmer

25

boom

26

poetry

27

hose clamp

28

Gewebeschlauch

29

saddle tank

30

swirl pot

K1

chamber

K2

chamber

Claims (8)

Suction pipe for the suction of a liquid, comprising a delivery nozzle ( 19 ) for discharging the liquid, further comprising a float valve arranged in the intake manifold ( 20 ), which closes the delivery pipe at a low liquid level in the intake manifold. Venturi nozzle, comprising a) an inlet ( 3 ), which supplies liquid with a first tube ( 2 ), b) an outlet ( 7 ), which supplies liquid with a second tube ( 6 ), c) a negative pressure area ( 11 ) between the first and the second tube, the liquid-supplying with a first intake manifold ( 12 ), d) a supply line ( 14 ) to the mouth area ( 9 ) of the first pipe connected to a second intake manifold ( 15 ) is connected or connectable. Venturi nozzle according to claim 2, wherein a third tube ( 13 ) receives the first tube and the space between them is part of the supply line. Venturi nozzle according to one of the preceding claims, with a switching means assigned to the supply line ( 1 ), with which the cross-sectional constriction either liquid from the inlet or the second intake is supplied. venturi according to one of the preceding claims, with switching means for an automatic feeder of liquid either from the inlet or the second intake trim for cross-sectional constriction. venturi according to one of the preceding claims, in which a suction pipe according to claim 1 is provided as switching means is. Fuel tank for a motor vehicle, with a Venturi nozzle ( 1 ) according to one of the preceding claims for conveying fuel to its calming pot ( 29 ). Fuel tank according to claim 7, designed as a saddle tank and with a venturi for conveying fuel from its two chambers (K1, K2) to a calming pot ( 29 ).