WO2011121248A1

WO2011121248A1 - Flap for closing off a gas flow duct and duct having such a flap

Info

Publication number: WO2011121248A1
Application number: PCT/FR2011/050730
Authority: WO
Inventors: Guillaume Davoult; Mathieu Lallemant
Original assignee: Valeo Systemes De Controle Moteur
Priority date: 2010-03-31
Filing date: 2011-03-31
Publication date: 2011-10-06
Also published as: FR2958360B1; FR2958360A1

Abstract

The invention relates to a flap for closing off a fluid flow line. The flap has a peripheral edge and is arranged so as to be mounted, in the line, such that it can move between an open position and two positions closing off the flow of fluid. The flap is characterized in that its edge has sealing means (10, 11) specific for sealing in the first closing-off position and sealing means specific for sealing in the second closing-off position. Thus, the flap is sealed on each side.

Description

Shutter shutter of a gas flow conduit and duct with such a shutter

The invention relates to a closure flap of a gas flow duct and a valve provided with such a shutter.

A motor vehicle engine has a combustion chamber, generally formed by a plurality of cylinders, in which a mixture of oxidant and fuel is burned to generate the engine work. The oxidizer comprises air, which can be compressed or not, depending on whether the engine comprises a compressor or not; when compressed, it is called supercharging air.

The fluids are made to follow different paths within the engine pipes. In general, in a pipe, the flow of fluids can be authorized, prohibited or regulated; for this purpose, a valve is provided, which can more or less close the pipe with a shutter, usually a shutter, movably mounted between an open position and a closed position. This is for example the case of the metering component discussed above.

Depending on the kinematics chosen for the motor valves, a flap may have two closed positions, these two closed positions corresponding to opposite positions of the flap, substantially spaced 180 ° from each other . This raises the question of the tightness between the shutter and the pipe in these closed positions.

The sealing of a shutter is generally difficult to implement satisfactorily, although many sealing systems are known. For example, shutters with an edge of particular shape - for example elliptical - are known to come into close contact with the wall of the pipe. Flaps are still known with a peripheral trough along their edge arranged to receive an annular rim of the pipe, of complementary shape, in the closed position of the flap. Flaps are still known with elastomeric seals, reliefs of deflection of the fluid flow, etc. None, however, seems to be able to give satisfaction in the case of a seal in two closed positions. Depending on the material chosen, the machining tolerances may be sufficiently small so that the seal between the edge of the flap and the duct wall can be ensured by direct contact between them in the closed position. In this case, the pipe being cylindrical, the edge of the shutter is generally bevelled to present a cylindrical bearing surface in a closed position in which the plane of the shutter is inclined relative to a plane transverse to the axis of the ducting in the shutter area. To seal in this case, the respective shapes of the support surface of the shutter and the inner surface of the pipe must be as complementary as possible. To this extent, the shutter can rotate in the pipe and come to marry the shape of the pipe in the closed position. Nevertheless, the adjustment between the surfaces prohibits shutter shutter in a position opposite to its position corresponding to the support of the bevel, because then it is not the surface of the bevel that would bear on the inner surface of the pipe but its slice, which would not guarantee a good seal.

This is why the invention aims to provide a shutter intended to close off a pipe in two different shutter positions, the shutter having a freedom of movement between these two shutter positions to adjust its opening and a guaranteed seal in each of these shutter positions. Thus, the invention relates to a closure flap of a fluid flow pipe, the flap having a peripheral edge and being arranged to be mounted in the pipe, movable between an open position and two shutter positions of the fluid flow, characterized in that its edge comprises sealing means specific to the sealing in the first closed position and sealing means specific to the sealing in the second shutter position.

In other words, the edge of the flap comprises sealing means in the first closed position but not in the second and sealing means in the second closed position but not in the first. Thanks to the invention, the seal is provided both in the first position and in the second, by means specific to each of them.

According to a preferred embodiment, the shutter is rotatably mounted about an axis between its open position and its two closed positions.

According to a preferred embodiment, the peripheral edge of the flap comprises a double bevel, each bevel forming a specific bearing surface at a closed position. The surface of each bevel thus bears on the surface of the pipe in the closed position considered.

According to one embodiment, the surface of the pipe being, in the vicinity of the shutter, of cylindrical shape, the surface of each bevel is of cylindrical shape.

According to one embodiment, the shutter extending generally in a plane and the surface of each bevel forming an angle with respect to this plane, the two angles are equal. Thus, it is not necessary to provide keying means for mounting the flap, the latter can be mounted in one direction or the other.

The invention also relates to a valve comprising a fluid flow pipe in which is mounted a shutter as described above.

Said valve comprises, for example, two so-called flow pipes between an inlet common to both said pipes and two outlets specific to each said pipe. The invention is particularly applicable to metal shutters but it goes without saying that it also applies to shutters in other materials and in particular plastic

The invention is particularly applicable to a double valve of the intake circuit of a motor vehicle engine or to a metering flap diesel engine. The Applicant does not intend, however, to limit the scope of its rights to this application alone, the invention generally applying to any shutter shutter in a pipe (or duct).

The invention will be better understood with the aid of the following description of the preferred embodiment of the shutter of the invention, with reference to the accompanying drawing plates, in which:

- Figure 1 shows a sectional view of a double valve with two flaps according to the preferred embodiment of the invention;

- Figure 2 shows a sectional view of an edge of one of the flaps of the valve of Figure 1;

- Figure 3a shows, on its lower part, a sectional view and on its upper part, a front view of a flap of the valve of Figure 1, in a first closed position;

- Figure 3b shows, on its lower part, a sectional view and on its upper part, a front view of the flap of Figure 3a, in an open position;

- Figure 3c shows, on its lower part, a sectional view and on its upper part, a front view of the flap of Figure 3a, in a second closed position;

FIG. 4a is a diagram showing the opening of a first flap of the valve of FIG. 1 as a function of the angular position of its drive motor and

FIG. 4b is a diagram showing the opening of a second flap of the valve of FIG. 1 as a function of the angular position of its drive motor.

Referring to Figure 1, there is shown a valve 1 located in the air intake circuit of a motor vehicle engine, between the turbocharger and the intake manifold. It is a three-way valve 1 comprising a first channel 2 for entering the compressed gas valve 1 from the turbocharger (it may be air or air mixed with exhaust gases). ), a second channel 3 indirectly connected to said intake manifold via a heat exchanger for cooling the intake gas and a third channel 4 connected directly to the air intake manifold in the engine. In other words, the third channel 4 is a cooled channel and the second channel 3 is a non-cooled channel. The valve 1 comprises a first shutter shutter 5 of the second channel 3 and a second shutter 6 shutter of the third channel 4. Each of the shutters 5, 6 to regulate the flow of gas in the channel 3, 4 in which he climbed. The two parts 5, 6 are structurally identical and only the first part 5 will be described later.

Referring to Figures 2 and 3a to 3c, the flap 5 is mounted in an X-axis tabular pipe portion having an inner surface 7. The flap 5 is in the form of a circular disk with a central bulge 8 of passage of a drive shaft extending along a Y axis perpendicular to the axis X of the pipe, which is fixedly secured. The drive shaft is rotated by a drive motor 13. The flap 5 has a circular-shaped edge in front view. The disk of the flap 5 extending generally in a plane P.

The flap 5 is mounted movably about its drive axis between an open position and two shutter positions, a first shutter position (shown in Figure 3a) in which the plane P of the flap 5 has an angle a with a plane D transverse to the axis X of the pipe and a second closed position (shown in FIG. 3a), on the opposite side to the first one, in which the plane P of the shutter 5 has an angle β with a D plane transverse to the X axis of the pipe.

The edge comprises sealing means 10 specific to the first closed position and sealing means 1 1 specific to the second closed position. In this case, the edge comprises a double bevel (that is to say two bevels), the first bevel 10 forming the first sealing means 10 and the second bevel 1 1 forming the second sealing means 1 1 For this purpose, the first bevel 10 has a surface forming an angle α with the plane P of the flap 5 while the second bevel 1 1 has a surface forming an angle β with the plane P of the flap 5. The two bevels 10, 1 1 are in this case formed on the entire edge of the flap 5; they meet at a circumferential edge 9. Thus, in the first shutter position, the flap 5 bears on the inner surface 7 of the pipe along its edge and more precisely its first bevel 10. The inner surface 7 being of cylindrical shape, the flap 5 comes into this support position in a position inclined at an angle equal to 90 ° -a relative to a transverse plane D to the axis X of the duct (that is to say an inclined position d an angle a with respect to the direction X of the pipe) (we speak here of angles in absolute value).

In the second shutter position, the flap 5 bears on the inner surface 7 of the pipe along its edge and more precisely on its second bevel 1 1. The inner surface 7 is cylindrical in shape, the flap 5 comes in this support position in a position inclined at an angle equal to 90 ° -β relative to a transverse plane D to the axis X of the pipe (that is to say a position inclined at an angle β with respect to the X direction of the pipe) (we speak here of angles in absolute value).

As shown in the diagram of FIG. 4a, the shutter 5 is thus movable between its first shutter position (angle -a with respect to the direction X of the pipe) and its second shutter position (angle + β relative to to the X direction of the pipe), passing through an open position in which it forms a zero angle with respect to the X direction of the pipe. This angular mobility is represented by the arrow 12 of FIG. 1. It corresponds to the kinematic law of opening of the flap 5 as a function of its drive motor 13.

For reasons of economy of production costs and ease of assembly, the second flap 6 is identical to the first although the valve 1 is not arranged so that it can come in two shutter positions. In this case, the valve 1 comprises a single motor 13 for driving the two flaps 5, 6 and, in a known manner, the gear mechanism between the motor 13 and the second flap 6 is arranged (thanks to disengaging means) so that the flap 6 is not rotated on a part of the angular stroke of the motor 13.

Thus, the opening kinematic law of the second flap 6 is as follows (represented in FIG. 4b):

- Between an angular position of the motor 13 corresponding to an angle equal to -a and a position corresponding to a zero angle, the second flap 6 is not driven by the motor 13 and remains in the closed position with an angle β relative to the X direction of the pipeline; - Between an angular position of the motor 13 corresponding to a zero angle and a position corresponding to an angle equal to + β, the second flap 6 is gradually open to a full open position. Therefore, the kinematics of the valve 1 is as follows depending on the angular position of the motor 13:

in a position of the motor 13 corresponding to an angle -a, the two flaps 5, 6 are closed;

- Between an angle -a and a zero angle of the motor 13, the first flap 5 is gradually open, the second flap 6 being closed;

at a position corresponding to a zero angle of the motor 13, the first flap 5 is completely open, the second flap 6 being closed and

- Between a zero angle and an angle + β of the motor 13, the first flap 5 is gradually closed while the second flap 6 is gradually closed.

In the embodiment described, the angles a and β are equal. This has the advantage that it is not necessary to provide on the flap 5 keying means, the flap can be mounted in any direction.

The invention has been described in connection with preferred embodiments, but it goes without saying that other embodiments can be envisaged. In particular, the characteristics of the various embodiments described can be combined with one another, if there are no incompatibilities.

Claims

claims

1-Shutter shutter of a fluid flow pipe, the shutter having a peripheral edge and being arranged to be mounted in the pipe, movable between an open position and two shutter positions of the flow characterized in that its edge has sealing means (10, 1 1) specific for sealing in the first closed position and sealing means for sealing in the second position. shutter.

2- shutter according to claim 1 which is rotatably mounted about an axis (Y) between its open position and its two closed positions.

3- shutter according to one of claims 1 and 2, the peripheral edge comprises a double bevel (10, 1 1), each bevel (10, 1 1) forming a specific bearing surface at a closed position.

4. Shutter according to claim 3 wherein, the surface of the pipe being in the vicinity of the flap, of cylindrical shape, the surface of each bevel (10, 1 1) is of cylindrical shape.

5. Shutter according to one of claims 3 and 4 wherein, the flap extending generally along a plane (P) and the surface of each bevel (10, 1 1) forming an angle (α, β) relative to this plane (P), the two angles (α, β) are equal.

6- valve comprising a fluid flow pipe in which is mounted a shutter (5, 6) having the characteristics of the shutter of one of claims 1 to 5.

7- valve according to claim 6 comprising two said flow pipes between an inlet common to both said pipes and two clean outlets to each said pipe.