FR3093475A1 - SET OF A FLUID INLET TUBING AND A DEGAZATION PIPE FOR A TANK - Google Patents

Abstract

A SET OF A FLUID INLET TUBING AND A DEGAZING PIPE FOR A TANK The invention relates to a set of a fluid inlet manifold (1a, 1b) and a pipe (2a, 2b). degassing for a tank, the pipe (2a, 2b) comprising, over a portion of its length, a degassing box (3) comprising a first compartment communicating with the pipe (2a, 2b). The degassing box (3) comprises a second compartment surrounding the tubing (1a, 1b) communicating with the tubing (1a, 1b), the first and second compartments being isolated from each other. FIGURE 2

Description

SET OF FLUID INTAKE MANIFOLD AND DEGASING HOSE FOR ONE TANK

Technical field of the invention

The present invention relates to an assembly of a fluid intake manifold and a degassing pipe for a fluid reservoir.

A particularly interesting but non-limiting application of the present invention is intended for a reservoir of reducing agent for a selective catalytic reduction of nitrogen oxides in an exhaust line of a heat engine of a motor vehicle, the engine being in particular by compression ignition.

Prior art

It is known to provide a tank with an inlet pipe for a fluid and a degassing pipe, the inlet pipe generally being of larger diameter than the degassing pipe which is more flexible than the pipe admission.

The fluid reservoir may be a consumable fluid reservoir. In particular, but without this being limiting, the fluid reservoir may be a reservoir of reducing agent for a selective catalytic reduction system also called SCR system, a name which may be used in the following to designate it as well as for designate its constituent parts as RCS tank for reducing agent tank.

However, in particular but not only in the automotive field, the tank according to the present invention can be a fuel tank or any other type of tank containing any fluid.

In what follows, the example of an RCS tank will be taken to describe the present invention. This is not limiting and the present invention can relate to any fluid reservoir equipped with a hose or flexible cable, most frequently a degassing hose and an inlet pipe for the fluid filling the reservoir. The intake manifold is generally stiff and not subject to bending.

For example, in the non-limiting case of an RCS reducing agent tank, filler necks have been developed which will be housed through a small hatch located on the exterior side of the vehicle, as well as RCS tanks located in lower part of the vehicle underbody. As pollution control standards become increasingly strict, the RCS tank is condemned to be filled more and more frequently.

It is also known to add to such a tank a degassing pipe to evacuate gases from the tank.

Figure 1 shows an assembly of a fluid inlet pipe 1a, 1b and a degassing pipe 2a, 2b for a fluid reservoir not shown in this figure.

The degassing pipe 2a, 2b, of smaller diameter than the diameter of the intake pipe 1a, 1b, carries a degassing box 3c internally forming a degassing compartment of the tank.

The degassing pipe 2a, 2b is therefore separated into a lower part 2b between the tank and the degassing box 3c and an upper part 2a above the degassing box 3c.

The degassing box 3c can be formed of an upper shell 3d and of a lower shell 3e in the substantially vertical position of the degassing pipe 2a, 2b on the degassing box 3c.

Snap-fastening means 9 are provided on the upper 3d and lower 3e shells to removably secure the degassing box 3c and consequently the degassing pipe 2a, 2b with the intake pipe 1a, 1b.

The latching means 9 may be in the form of arms ending in an open arc of a circle partially surrounding the circumference of a portion of the tubing 1a, 1b and being elastically biased against the portion of the tubing 1a, 1b.

It was found that the degassing box applied only to the degassing pipe can generate a backflow of fluid contained in the tank due in particular to the thrust of air bubbles rising from the tank via the intake manifold. The discharged fluid can thus subsequently flow outside the tank and the degassing pipe and intake manifold assembly mainly by being discharged through the intake manifold feed mouth.

This may be the case for a more or less corrosive fluid. For example, for an RCS reducing agent tank, reducing agent, frequently based on urea, can flow onto the bodywork of the motor vehicle, which is at least aesthetically disturbing.

Therefore, the problem underlying the invention is to design an assembly of a degassing pipe and a fluid inlet pipe for a fluid reservoir which can avoid the backflow of fluid through the pipe of admission.

To this end, the present invention relates to an assembly of a fluid inlet pipe and a degassing pipe intended for a reservoir, the pipe comprising, over a portion of its length, a degassing box comprising a first compartment communicating with the pipe, remarkable in that the degassing box comprises a second compartment surrounding the tubing by communicating with the tubing, the first and second compartments being isolated from each other.

The technical effect obtained by the present invention, due to the creation of an additional volume at the level of the degassing box for the intake manifold, is to avoid the backflow of fluid at the outlet of the intake manifold. opposite to its normal flow.

To create this additional volume, the present invention uses the degassing box of the degassing pipe by adding to it a compartment separate from the degassing compartment associated with the degassing pipe.

This has the first advantage of not requiring the creation of a new box to create the additional volume associated with the intake manifold but of modifying the element already present on the assembly, the degassing box, to add a compartment associated with the intake manifold, which reduces the size of the two compartments and saves material.

A second advantage is to reinforce the attachment of the degassing pipe to the intake manifold by no longer requiring the presence of snap-fastening means due to the fact that the degassing box secures the degassing pipe to the intake manifold, which also represents a saving of means, a more solid connection between the degassing pipe and the intake manifold as well as easier assembly.

The degassing box is thus integrated into the fluid intake pipe by comprising two chambers or compartments which are separated from each other. The first compartment is integrated into the degassing pipe and the second compartment is integrated into the intake manifold.

By adding a second compartment associated with the intake manifold, it is avoided that air bubbles rise at the level of the supply mouth of the intake manifold and subsequently a flow of fluid outside. of the intake manifold.

This results in an absence of risk of fluid backflow through the intake pipe, in particular at the end of filling the tank.

Advantageously, the first and second compartments are separated by a wall internal to the degassing box. The degassing box thus obtained has a much smaller dimension than the combination of a degassing box on the degassing pipe and an anti-backflow box on the intake manifold.

Adapting a degassing box from a degassing pipe to obtain a two-compartment degassing box common to the pipe and the intake manifold is relatively simple to achieve.

Advantageously, the degassing box comprises an upper shell and a lower shell, the upper shell integrating an upper part of the first compartment and an upper part of the second compartment and the lower shell integrating a lower part of the first compartment and a lower part of the second compartment , the lower and upper parts respectively of the first and second compartments being complementary.

Advantageously, the upper and lower shells are removable from each other.

Each compartment is thus removable for cleaning or maintenance. A hull can be replaced without requiring the replacement of the entire degassing box with all the hulls.

Advantageously, an upper portion of the fluid inlet pipe opens into the upper part of the second compartment and a lower portion of the fluid inlet pipe complementary to the upper portion of the pipe enters the lower part of the second compartment, while a lower portion of the degassing pipe opens into the lower part of the first compartment and an upper portion of the degassing pipe complementary to the lower portion of the pipe enters the upper part of the first compartment.

The normal circulation of liquid or gaseous fluid in the intake manifold and the degassing pipe takes place in opposite directions to each other.

Advantageously, an outlet and a mouth having an equivalent diameter of the tubing in the second compartment are at least twice as large as an outlet and a mouth of the degassing pipe having an equivalent diameter in the first compartment.

It is normal for the diameter of the intake manifold to be larger than the diameter of the vent pipe to facilitate fluid filling of the reservoir. The mouth and the outlet of the second compartment therefore have diameters which are larger than the diameters of the mouth and the outlet of the first compartment.

Advantageously, the first compartment has a rectangular section and the second compartment has a trapezoidal section, a section of each shell of the first and second compartments decreasing starting from a junction zone of the upper and lower shells of the same compartment towards one end. of each shell entering or exiting into the pipe and the tubing.

Advantageously, the second compartment delimits a larger internal volume than the first compartment.

The invention relates to a fluid reservoir, remarkable in that it comprises such an assembly of a fluid inlet pipe and a degassing pipe.

Advantageously, the fluid reservoir is a reservoir of reducing agent for a selective catalytic reduction of nitrogen oxides.

This makes it possible to prevent the reducing agent, advantageously based on urea, from flowing out of a reducing agent filler flap arranged on the outer wall of the bodywork, advantageously near the fuel filler flap towards a rear lateral side of the motor vehicle.

The present invention finally relates to a motor vehicle, remarkable in that it comprises such a fluid reservoir, advantageously a reservoir of reducing agent for a selective catalytic reduction of nitrogen oxides, which is not limiting, the tank which can be a fuel tank or a tank containing any fluid.

Brief description of figures

Other characteristics, objects and advantages of the present invention will appear on reading the detailed description which follows and with regard to the appended drawings given by way of non-limiting examples and in which:

- Figure 1 is a schematic representation of a side perspective view of an assembly of a degassing pipe and a fluid intake pipe intended for a reservoir, the assembly being according to the state of the technical,

- Figure 2 is a schematic representation of a side perspective view of an assembly of a degassing pipe and a fluid inlet pipe intended for a reservoir, the assembly being according to an embodiment of the present invention by presenting a degassing box common to the degassing pipe and to the intake pipe, while however having two separate compartments for the pipe or the pipe,

- Figure 3 is a schematic representation of a section of a degassing box with two compartments for an assembly according to one embodiment of the present invention, the degassing box being shown enlarged with respect to Figures 1 and 2.

It should be borne in mind that the figures are given by way of examples and do not limit the invention. They constitute schematic representations of principle intended to facilitate understanding of the invention and are not necessarily at the scale of practical applications. In particular, the dimensions of the various elements shown are not representative of reality.

Detailed description of the invention

In what follows, reference is made to all figures taken in combination. When reference is made to a specific figure or figures, these figures are to be taken in combination with the other figures for the recognition of the designated reference numerals.

In what follows, the terms “upper”, “lower”, and other references to spatial positions are understood to refer to components positioned in their operating position and normal use, in particular but not limited to a motor vehicle. on a horizontal plane with the intake manifold and the degassing pipe extending substantially vertically.

Figure 1 has already been described in the introductory part of the description of the present application.

Referring to Figures 2 and 3, the present invention relates to an assembly of a fluid inlet pipe 1a, 1b and a degassing pipe 2a, 2b intended for a reservoir.

The degassing pipe 2a, 2b and the inlet pipe 1a, 1b extend substantially vertically in the position mounted on the tank, the tank not being visible in the figures.

The degassing pipe 2a, 2b comprises, over a portion of its length, a degassing box 3 comprising a first compartment 4, visible in FIG. 3, communicating with the degassing pipe 2a, 2b.

According to the invention, the degassing box 3 comprises a second compartment 5, visible in FIG. 3, surrounding the fluid inlet pipe 1a, 1b communicating with the pipe 1a, 1b. The first and second compartments 4, 5 are isolated from each other.

As can be seen in Figure 3, the first compartment 4 and the second compartment 5 are separated by an internal wall 6 to the box 3 degassing.

In a preferred embodiment, the degassing box 3 may comprise an upper shell 3a and a lower shell 3b.

The upper shell 3a can integrate an upper part of the first compartment 4 and an upper part of the second compartment 5 and the lower shell 3b can integrate a lower part of the first compartment 4 and a lower part of the second compartment 5.

The lower and upper parts respectively of the first and second compartments 4, 5 can be complementary while being substantially equal.

To facilitate disassembly of the degassing box 3, the upper 3a and lower 3b shells can be removable from one another.

The upper 3a and lower 3b shells can each have a rim 10 facing each other and resting against each other in the mounted position of the degassing box 3.

Referring mainly to Figure 2, an upper portion 1a of the fluid intake pipe 1a, 1b can open out into the upper part of the second compartment 5.

A lower portion 1b of the fluid inlet pipe 1a, 1b, complementary to the upper portion 1a of the fluid inlet pipe 1a, 1b, can flow into the lower part of the second compartment 5 of the degassing box 3 . The usual circulation of the fluid is from top to bottom when filling the tank in the intake manifold 1a, 1b.

Conversely, a lower portion 2b of the degassing pipe 2a, 2b can open into the lower part of the first compartment 4. An upper portion 2a of the degassing pipe 2a, 2b, complementary to the lower portion 2b of the degassing pipe 2a, 2b, can fit into the upper part of the first compartment 4.

Referring again mainly to Figure 3 but also to Figure 2, an outlet 7 and a mouth of the fluid inlet pipe 1a, 1b may have an equivalent diameter.

The outlet 7 and the mouth of the fluid inlet pipe 1a, 1b in the second compartment 5 can be at least twice as large as an outlet and a mouth 8 in the first compartment 4 of the pipe 2a, 2b of degassing. The outlet and the mouth 8 can be of equivalent diameter in this first compartment 4.

Still referring primarily to Figure 3, the first compartment 4 may have a rectangular or square section. The second compartment 5 may have a trapezoidal section. This is not limiting.

The vertices of rectangular, square or trapezoidal sections can be rounded.

As shown in Figure 2, a section of each shell 3a, 3b of the first and second compartments 4, 5 can decrease starting from a junction zone of the upper 3a and lower 3b shells of the same compartment 4 or 5 towards a end of each shell 3a, 3b opening into or opening out into the degassing pipe 2a, 2b or the fluid inlet pipe 1a, 1b.

This reduction therefore takes place in the length of the shells 3a, 3b, that is to say in the height of the degassing pipe 2a, 2b or of the fluid intake pipe 1a, 1b, the sections being smaller at the level of the connections to the degassing pipe 2a, 2b or to the fluid intake pipe 1a, 1b than in a middle zone of the shell 3.

As particularly clearly visible in Figure 3, the second compartment 5 can delimit a larger internal volume than the first compartment 4.

The invention also relates to a fluid reservoir comprising an assembly as previously described of a fluid inlet pipe 1a, 1b and a degassing pipe 2a, 2b.

The fluid reservoir can be a reducing agent reservoir for selective catalytic reduction of nitrogen oxides or SCR reservoir.

Such an RCS tank can be fitted to a motor vehicle with a combustion engine, in particular with compression ignition. It is nevertheless possible to apply the present invention to other tanks present or not in a motor vehicle, in particular a tank for fuel, cooling fluid or any other fluid.

The invention is in no way limited to the embodiments described and illustrated which have been given by way of examples only.

Claims (10)

Assembly of a fluid inlet pipe (1a, 1b) and a degassing pipe (2a, 2b) intended for a reservoir, the pipe (2a, 2b) comprising, over a portion of its length, a box degassing box (3) comprising a first compartment (4) communicating with the pipe (2a, 2b), characterized in that the degassing box (3) comprises a second compartment (5) surrounding the tubing (1a, 1b) by communicating with the tubing (1a, 1b), the first and second compartments (4, 5) being isolated from each other. Assembly according to the preceding claim, in which the first and second compartments (4, 5) are separated by an internal wall (6) to the degassing box (3). Assembly according to any one of the preceding claims, in which the degassing box (3) comprises an upper shell (3a) and a lower shell (3b), the upper shell (3a) integrating an upper part of the first compartment (4) and an upper part of the second compartment (5) and the lower shell (3b) integrating a lower part of the first compartment (4) and a lower part of the second compartment (5), the lower and upper parts respectively of the first and second compartments ( 4, 5) being complementary. Assembly according to the preceding claim, in which the upper (3a) and lower (3b) shells are removable from each other. Assembly according to any one of the two preceding claims, in which an upper portion (1a) of the fluid inlet pipe (1a, 1b) opens into the upper part of the second compartment (5) and a lower portion (1b) of the tubing (1a, 1b) for admission of complementary fluid from the upper portion (1a) of the tubing (1a, 1b) enters the lower part of the second compartment (5), while a lower portion (2b) of the degassing pipe (2a, 2b) opens into the lower part of the first compartment (4) and an upper portion (2a) of the degassing pipe (2a, 2b) complementary to the lower portion (2b) of the pipe (2a, 2b ) mouth in the upper part of the first compartment (4). Assembly according to the preceding claim, in which an outlet (7) and a mouthpiece having an equivalent diameter of the tubing (1a, 1b) in the second compartment (5) are at least twice as large as an outlet and a mouthpiece ( 8) of the degassing pipe (2a, 2b) of equivalent diameter in the first compartment (4). Assembly according to any one of the two preceding claims, in which the first compartment (4) has a rectangular section and the second compartment (5) has a trapezoidal section, a section of each shell (3a, 3b) of the first and second compartments (4, 5) decreasing starting from a junction zone of the upper (3a) and lower (3b) shells of the same compartment towards one end of each shell (3a, 3b) opening or opening into the pipe (2a, 2b) and the tubing (1a, 1b). Assembly according to any one of the preceding claims, in which the second compartment (5) delimits a larger internal volume than the first compartment (4). Fluid reservoir, characterized in that it comprises an assembly of a fluid inlet pipe (1a, 1b) and a degassing pipe (2a, 2b) according to any one of the preceding claims. Fluid reservoir according to the preceding claim, which is a reservoir of reducing agent for a selective catalytic reduction of nitrogen oxides.