EP1916409A1 - Device for supplying a gaseous fluid for a gaseous fluid circulation circuit and filtering device equipped with such a device for supplying a gaseous fluid - Google Patents

Abstract

The device has a mobile membrane (7) to separate a case (2) into compartments (2A, 2B). The case has connection units (3, 4) respectively connecting the compartment (2A) with a gaseous fluid supply circuit and the membrane with an obturator (11) e.g. valve, of an additional gaseous fluid supply inlet (25) of the circuit. The membrane is deformed by pressure variations in the compartment to open the inlet. Springs (8, 9) return the membrane to a closed position of the obturator, and are pre-stressed by a temperature probe (6) extensible based on temperature outside and inside the circuit.

Description

The present invention relates to a device for supplying gaseous fluid, for a gaseous fluid circulation circuit to at least one gaseous fluid supply inlet, as well as a gaseous fluid circulation circuit and a filtration device equipped with such a device for supplying gaseous fluid.

Many gaseous fluid circulation circuits are today equipped with a main air inlet and an additional closable air inlet. This is particularly the case of air intake circuits of internal combustion engines, in particular supercharged engines. The additional air inlet is generally positioned on the air intake circuit, downstream of a filter equipping the circuit. The main air inlet is usually an inlet of fresh air kept constantly open. The opening control of the additional air inlet can operate under various conditions. Thus, it is found that the gaseous fluid filtration device integrated in the circuit clogs in time. To maintain a good air flow at the engine to supply air, despite the clogging of the filter, it can be expected to open the additional air intake inlet positioned downstream or in line with the filtered. This air intake must open when the pressure drops on the circuit reach a predetermined value. This additional air inlet can also be opened when the temperature outside the circuit is a negative temperature. Thus, again in the case of an application to an air intake circuit of a supercharged engine, it may be advantageous to control the opening of additional air intake in snow when the temperature is close of - 10 ° C. The risk otherwise is to cause a rapid fouling of the filter in about an hour due to the nature of the dry snow passing through said filter. The opening of this additional air inlet must therefore be controlled while the pressure drops on the circuit do not reach the value corresponding to a clogged filter.

The mechanical design devices known to date for controlling the opening of the additional air intake are based on the presence of an extensible thermal probe whose variation in length resulting from a variation of temperature allows the displacement of a shutter to which it is directly coupled. In this case, the control for example in opening can be performed for given temperature conditions regardless of the vacuum conditions inside the circuit. It is therefore not possible to prevent a displacement of the shutter during a temperature variation causing a variation in the length of the probe, even if the vacuum conditions inside the circuit are not met.

Control devices having such a disadvantage are described in the patents FR-2423647 , FR-2550581 and DE-2855198 . In these devices, the probe partially housed in a compartment of the housing is directly coupled to the shutter. The other housing compartment is connected to a vacuum source and is provided with a return spring of the membrane / probe assembly in the closed position of the shutter. The interposition of the probe between membrane and shutter with a direct action of the variation of length of the probe on the movement of the shutter prevents to control the shutter only under the action of two parameters, namely the couple temperature, circuit depression.

Moreover, in these devices, there are provided each time organs, such as bimetallic or bimetallic element complementary to the action of the probe. This results in a significant complexity of the devices.

In order to be able to obtain two positions of opening control of said additional air inlet for the same pressure value inside the circuit, complex solutions based on electronic or electrical components have been envisaged until now. held in time is limited. As a result, the advantages obtained by the additional air inlet which makes it possible to increase the longevity of the filter equipping said circuit are in this case useless since they are the components necessary for the control of opening of the input of air additional that have a reduced wear in time.

An object of the present invention is therefore to provide a device for supplying gaseous fluid whose design gives it improved robustness and durability.

Another object of the present invention is to provide a device for supplying gaseous fluid whose design makes it possible to dispense with complex components based on electronics.

Another object of the present invention is to propose a device for supplying a gaseous fluid whose design allows the shutter to be controlled from temperature and vacuum torques so that, for the same value of depression in the circuit, circulation of gaseous fluid, either for the same temperature value, controlled or not in a controlled manner the opening of a closable air inlet equipping said circuit.

For this purpose, the subject of the invention is a device for supplying gaseous fluid for a gaseous fluid circulation circuit to at least one gaseous fluid supply inlet, this device comprising at least one pneumatic actuator and a shutter for the or at least one gaseous fluid supply inlet of the circuit, said actuator being in the form of a housing compartmentalized by a membrane, this housing comprising on the one hand means for connecting one of its compartments to said circuit, on the other hand means for connecting the membrane to the shutter of at least one circuit input, said membrane, coupled to the shutter, being a movable membrane, capable of being deformed by the variations of pressure prevailing inside the housing compartment connectable to said circuit, to allow, during its deformation, the opening of said circuit input, this membrane being biased in the closed position of the shutter by elastically deformable means, the elastically deformable means reminding the diaphragm in the closed position of the shutter being prestressed by means of at least one temperature-expandable thermal probe, such as this reigning outside and / or inside the gaseous fluid circulation circuit, characterized in that the housing compartment connectable to said circuit and adapted to be subjected to a pressure variation in the state connected to said housing circuit the thermal probe and the elastically deformable means reminding the membrane in the closed position of the shutter, said elastically deformable means being interposed between the thermal probe and the membrane coupled to the shutter.

As the elastically deformable means are sensitive, that is to say able to be deformed on the one hand under the action of a displacement of the membrane resulting from a pressure variation inside the circuit, of on the other hand, under the action of a variation of temperature, in particular inside the housing, these springs offer either for the same control pressure or for the same temperature, the possibility of obtaining or not the opening control. shutter. Thanks to the non-interposition of the probe between membrane and shutter and the absence of mechanical coupling between probe and shutter, the shutter is not integral in displacement of the probe and is controlled in displacement from two parameters acting in combination namely the temperature and the value of the circuit depression. This gives the opening of the circuit for at least two couples (temperature, depression) corresponding to a negative temperature and a depression of a few tens of millibars (35 millibars), the other at a positive temperature of 40 ° C and at a depression of the order of 80 millibars. Thus, for the same temperature value, it is controlled or not the opening of the shutter as a function of the value of the depression. Similarly, for the same depression value, it is controlled or not the opening of the shutter as a function of temperature.

Thus, the prestressing of the elastically deformable means, that is to say the compression of the elastically deformable means intended to increase their resistance, is modulated by the temperature. It is therefore possible, for the same pressure value of the gaseous fluid in the gaseous fluid circulation circuit, to vary the threshold for triggering the deformation of the fluid. membrane and therefore the triggering threshold of the opening of the closable air inlet, said generally additional air inlet opening of the circuit.

It is thus possible to obtain an opening of the additional air inlet either when the filter equipping the gaseous fluid circulation circuit is clogged, or when the temperature outside said circuit is negative and that the atmospheric conditions could lead to a rapid clogging of the filter equipping said circuit.

According to a preferred embodiment of the invention, the elastically deformable means reminding the diaphragm in the closed position of the shutter comprise at least two springs. The springs are here compressed on the one hand under the action of an extension of the probe, on the other hand under the action of a pressure variation, in particular a pressure drop in the direction of a reducing the volume of the compartment housing the elastic return means said spring compartment. The springs may be identical or of different strength. In the case of springs of different strength, the weakest spring force is more particularly stressed at low temperature in the retracted position of the probe and acts against the deformation of the membrane obtained by the vacuum control. The greater force spring is more particularly urged in the extended position of the probe so that a large depression is required to control the deformation of the membrane and therefore the opening of the shutter.

Preferably, the springs are disposed one on one side, the other on the other side of a so-called intermediate piece, positioned inside the spring compartment of the actuator housing, one springs being disposed between the extensible portion of the probe or a piece that caps the extensible portion of the thermal probe and said intermediate piece, the other of the springs extending between said intermediate piece and the movable membrane or a moving integral part of said membrane. The expandable thermal probe, housed inside the so-called spring compartment of the actuator housing, includes a probe body from which protrudes a rod of variable length as a function of the temperature forming the extensible part of the probe, this extensible portion of the probe being capped by a piece and in that the intermediate piece has the shape of two ducts held coaxial by a radial connection generally in one piece with said conduits, the inner conduit coming to thread over an axial projection of the piece covering the extensible portion of the probe while the outer conduit is provided with a radial rim forming surface of one of the springs. With this arrangement, the probe is independent in displacement of the shutter coupled directly to the membrane without interposition of the probe.

Likewise, preferably, the means for connecting the so-called spring compartment of the actuator housing to the circuit and the means for connecting the diaphragm to the shutter of a circuit input are common on at least part of their length. The means for connecting the diaphragm to the shutter comprise at least one tubular part projecting at least partially from the actuator housing and passing through the membrane connected to said part in a sealed manner by forming a flange around said part, this tubular part , coupled to the shutter, such as a shutter, by a connecting arm, being driven by an axial reciprocating movement in the direction of the inside or the outside of the housing under the effect of the deformation of the membrane. The tubular piece opens at one of its ends into the compartment, said springs of the housing and is connectable by its other end, directly or via a connecting piece, to a suction zone or depression of the circuit. The spring compartment is thus subject to pressure variations within the circuit.

The subject of the invention is also a circuit for circulating gaseous fluid, in particular an air intake of an internal combustion engine, said circuit being equipped with at least one so-called main air inlet, a air filter filtering air from said inlet and an additional closable air inlet preferably disposed downstream or vertically above the air filter, characterized in that the additional air inlet is controlled by opening through a gaseous fluid supply device of the aforementioned type.

The subject of the invention is also an air filtration device, in particular for air intake circuit of an internal combustion engine, said device being in the form of a housing equipped for its connection to the circuit of an inlet and an air outlet, this housing enclosing a filter compartmentalizing the housing and filtering air from the air inlet of said housing before its expulsion from said housing through the air outlet, said housing having the right , in particular at the plumb or downstream of the filter, an additional air inlet closable, characterized in that the additional air inlet is controlled in opening via a device for supplying gaseous fluid from the aforementioned type, the actuator of the gaseous fluid supply device being integrated in the housing of the air filtration device.

Preferably, the shutter of the gaseous fluid supply device is disposed outside the filtering device housing and moves outwardly of said housing as it passes from the closed position to the open position of the additional air intake. The additional air inlet closable of the filter device housing is made in one piece with the gaseous fluid supply device. This solution makes it possible to guarantee perfect adaptation of the shutter to the air supply inlet of the circuit and simplification of the assembly.

• la figure 1 représente une vue en coupe d'un dispositif de filtration du fluide gazeux circulant à l'intérieur d'un circuit de circulation de fluide, ce dispositif de filtration étant équipé d'un dispositif d'alimentation en fluide gazeux conforme à l'invention ;
• la figure 2 représente une vue en coupe d'un dispositif d'alimentation en fluide gazeux conforme à l'invention dans une position dans laquelle l'obturateur est en position ouverte, la ligne d'admission d'air a une perte de charge supérieure à 35 millibars et la température est de -10°C ;
• la figure 3 représente une vue en coupe d'un dispositif d'alimentation en fluide gazeux dans une position fermée de l'obturateur correspondant au cas où la température extérieure au circuit est de -10°C et où la ligne d'admission d'air du circuit à une perte de charge inférieure à 35 millibars;
• la figure 4 représente une vue en coupe d'un dispositif d'alimentation en fluide gazeux en position fermée de l'obturateur dans des conditions dans lesquelles la température extérieure au circuit est de 0°C, la ligne d'admission d'air du circuit a une perte de charge supérieure à 35 millibars et inférieure à 85 millibars ;
• les figures 5 et 6 représentent à chaque fois une vue en coupe d'un dispositif d'alimentation en fluide gazeux en position fermée (figure 5) ou ouverte (figure 6) de l'obturateur dans des conditions dans lesquelles la température interne au circuit est de 90°C et la ligne d'admission d'air du circuit de circulation de fluide gazeux a une perte de charge comprise entre 35 et 75 millibars (figure 5), supérieure à 85 millibars (figure 6), la valeur de 85 millibars correspondant au seuil de déclenchement de l'ouverture de l'obturateur.

The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which:

• FIG. 1 represents a sectional view of a device for filtering the gaseous fluid circulating inside a fluid circulation circuit, this filtration device being equipped with a device for supplying gaseous fluid in accordance with FIG. invention;
• FIG. 2 represents a sectional view of a device for supplying gaseous fluid according to the invention in a position in which the shutter is in the open position, the air intake line has a pressure drop greater than 35 millibars and the temperature is -10 ° C;
• FIG. 3 represents a sectional view of a gaseous fluid supply device in a closed position of the shutter corresponding to the case where the temperature outside the circuit is -10 ° C. and the intake line of FIG. circuit air at a pressure drop of less than 35 millibars;
• FIG. 4 is a sectional view of a device for supplying gaseous fluid in the closed position of the shutter under conditions in which the temperature outside the circuit is 0.degree. C., the air intake line of FIG. circuit has a pressure drop greater than 35 millibars and less than 85 millibars;
• FIGS. 5 and 6 show in each case a sectional view of a gaseous fluid supply device in the closed (FIG. 5) or open (FIG. 6) position of the shutter under conditions in which the temperature inside the circuit is 90 ° C and the air intake line of the gaseous fluid circulation circuit has a pressure drop of between 35 and 75 millibars (Figure 5), greater than 85 millibars (Figure 6), the value of 85 millibars corresponding to the trigger threshold of the opening of the shutter.

As mentioned above, the invention relates to a device for supplying gaseous fluid for a gaseous fluid circulation circuit to at least one gaseous fluid supply inlet. In the following, the device for supplying gaseous fluid will be more particularly described in the case of an application to an air intake circuit of a supercharged engine generally vehicle. The supercharged air intake circuit is therefore a circuit equipped with a main intake air intake, generally called fresh air intake inlet, and at its other end a turbocharger allowing the supply in the engine air from the fresh air inlet. So air intake circuit of the supercharged engine, there is also provided a filter device conforming for example to that shown in Figure 1. This filter device is in the form of a housing 21 equipped for its connection to the rest of the circuit, an air inlet 22 and an air outlet 23. The housing 21 is partitioned by means of a filter 24 filtering the air from the inlet 22 before being rejected in the circuit by the output 23 of said housing. A tapping is provided downstream of the filter 24 for connecting the supply device described below to a zone 27 of depression or suction of the circuit forming the control depression of the device. This filtration device is equipped, downstream or vertically above the air filter 24, with an additional air inlet shown at 25 in the figures. This additional air inlet 25 is a closable inlet capable of being closed off by means of a device for supplying gaseous fluid according to the invention.

In the example shown in FIG. 1, the device for supplying gaseous fluid is integrated into the casing of the filtration device but it could have been equivalently positioned on an upstream portion of the fluid circulation circuit or on an downstream portion of said circuit without departing from the scope of the invention. This gaseous fluid supply device generally comprises at least one pneumatic actuator 1 and a shutter member 11 of the at least one gaseous fluid supply inlet 25 of the circuit. In the examples shown, the circuit comprises a main gaseous fluid supply inlet, represented at 22, and a so-called supplementary gas supply inlet 25, this inlet 25 being a closable entrance while the main entrance 22 is kept constantly open. Of course, all other configurations can be considered. Indeed, such a device for supplying gaseous fluid can also be integrated into a gaseous fluid circulation circuit comprising a single inlet for filling gaseous fluid or a circuit comprising at least two fluid supply inlets. gaseous, at least one of said entries being closable.

Regardless of the number of gaseous fluid supply inputs fitted to the gaseous fluid circulation circuit, the supply device comprises in each case at least one pneumatic actuator and a closure member 11. The pneumatic actuator 1 is in the form of a housing 2 compartmentalized by a membrane 7, the compartments having been shown at 2A and 2B in the figures. This housing also comprises, on the one hand, means 3 for connecting the one 2A of its compartments 2A, 2B to the circuit, on the other hand, means 4 for connecting the membrane 7 to the shutter 11 of a circuit input. This device therefore makes it possible, under predetermined pressure and temperature conditions, to control the opening of the gaseous fluid supply inlet 25 of the circuit by displacement of the shutter member 11 closing said inlet 25. , the membrane 7, coupled to the shutter 11, is a movable membrane, capable of being deformed by the pressure variations inside the compartment 2A of the housing 2 connectable to said circuit. This membrane thus allows, during its deformation, the opening of said circuit input 25 by moving control of the shutter 11 coupled to said membrane. This membrane 7 is recalled in the closed position of the shutter 11 by means 8, 9 elastically deformable.

In the examples shown, these resiliently deformable means 8, 9, which recall the membrane 7 in the closed position of the shutter 11, are formed by two springs housed inside the compartment 2A and are prestressed by means of minus a thermally expandable temperature probe 6, such as that prevailing outside and / or inside the gaseous fluid circulation circuit. The springs are thus disposed between the probe 6 and the membrane 7, the membrane 7 being coupled to the shutter 11.

In the examples shown, the thermal probe 6 is extensible as a function of the temperature prevailing outside the gaseous fluid circulation circuit. Thus, depending on the temperature and the pressure conditions of the air intake line of the fluid circulation circuit, it is possible to controlling, through the device, the opening of the additional air inlet 25 equipping said circuit.

As the prestressing of the elastically deformable means reminding the membrane 7 in the closed position of the shutter 11 is adjustable by said external temperature, is varied, for the same pressure value, the trigger threshold of the deformation of the membrane so that it is possible to control for the same pressure value of the air intake line of the fluid circulation circuit the opening of the additional feed inlet gaseous fluid of the circuit or on the contrary to keep closed this opening.

As mentioned above, the casing 2 of the actuator comprises, on the one hand, means 3 for connecting one of its compartments, in this case the compartment 2A to the fluid circulation circuit, in particular to the compartment 27 disposed downstream of the filter 24 of the filtration device, on the other hand, means 4 for connecting the membrane 7 to the shutter 11 of a fluid circulation circuit inlet 25. In the examples shown, the means 3 for connecting a 2A of the compartments 2A, 2B of the housing 2 of the actuator 1 to the circuit and the means 4 for connecting the membrane 7 to the shutter 11 of an inlet 25 circuit are common over at least a portion of their length so as to simplify the design of the device and to reduce the overall size of the assembly. For this purpose, the means 4 connecting the membrane 7 to the shutter 11 comprise at least one tubular part 5 projecting at least partially from the housing 2 of the actuator 1 and through the membrane 7 connected to said part 5 in a sealed manner forming a flange around said part 5. This tubular piece which opens at one of its ends in a spring compartment 2A of the housing 2 and is connectable by its other end, directly or via a part 12 of connection, to a zone 27 of depression or suction of the circuit, is driven by a reciprocating axial movement in the direction of the inside or outside of the housing 2 under the effect of the deformation of the membrane 7.

The tubular piece 5 thus acts both as a connecting piece of the membrane to the shutter 11 and the role of placing the compartment 2A of the device housing in communication with the vacuum or vacuum zone 27 of the circuit, corresponding to the gaseous fluid circulation circuit zone positioned downstream of the filter 24 fitted to said circuit. Thus, the depression prevailing inside the zone 27 of the gaseous fluid circulation circuit makes it possible, when it reaches a predetermined value, in particular during clogging of the filter, to control, because of the transmission of this depression in the spring compartment 2A, the deformation of the membrane 7 against the elastically deformable means acting on said membrane to thereby allow the opening of the additional air inlet equipping said circuit and thus overcome the flow variations of air resulting from clogging of the filter.

In the examples shown in the figures, the shutter 11 of the gaseous fluid supply inlet 25 of the circuit is in the form of a flap. The tubular part, to which the membrane 7 is sealingly connected, is thus coupled to the shutter 11 preferably in the form of a flap by a connecting arm 10. The thermal probe is not interposed between membrane 7 and shutter 11 and is not intended to transmit the movement of the membrane to the shutter. Under the effect of the deformation of the membrane 7 generated by the increase of the vacuum inside the circuit due to clogging of the filter, the membrane 7 is deformed. This deformation is transmitted through the tubular member 5 moved axially to the connecting arm 10 which then controls the passage of the shutter 11 from a closed position to an open position of the gaseous fluid supply inlet 25 of the circuit.

Note that in the example shown, the connecting arm 10 is snapped onto the tubular member and is mounted with clearance on said tubular member. The means 3 for connecting the compartment 2A of the housing 2 of the actuator to the fluid circulation circuit similarly comprise this part 5 tubular whose end protruding outside the housing is connected, via a connecting piece 12, such as a flexible conduit to the zone 27 of the filter device disposed downstream of the filter 24 of said device . This connecting piece 12, made in the form of a flexible pipe, could equally have been made in the form of a rigid pipe or be removed to allow a direct connection of the tubular part to the zone 27 of depression or aspiration of the circuit, in particular by fitting said parts together in order to subject the compartment 2A spring to said depression through this connection by a channel or suction duct of the compartment 2A with the fluid circuit. This connection therefore allows a variation of pressure inside the compartment 2A, this pressure variation, also called control depression, being able to cause the displacement of the membrane 7 and, consequently, the opening of the shutter.

In the examples shown, the tubular part 5 is therefore the element common to the means 3 for connecting the compartment 2A of the actuator housing to the circuit and the means for connecting the diaphragm 7 to the shutter 11 of an inlet 25. of circuit. This tubular piece 5 has, at or near its end housed in the housing 2 of the actuator 1, a shoulder 13 coming from one of its faces bearing against a wall of the housing 2 of the actuator 1 in position closed shutter 11 and delimiting by its other face a bearing surface of elastically deformable means 9 of return of the membrane 7 in the closed position of the shutter 11. Note that, in the examples shown, the housing 2 of the actuator consists of at least two parts assembled together by snapping or welding, the membrane 7 being positioned at the joint plane between the constituent elements of the housing. This housing is equipped, in one of its compartments, with an opening through which the tubular part is introduced to allow the connection of the other of the compartments of the housing to the circuit.

As mentioned above, the membrane 7 compartmentalizing the housing 2 of the actuator is returned to the closed position of the shutter 11 of the gaseous fluid supply inlet 25 of the circuit by two springs 8, 9. These springs 8, 9 for returning the membrane 7 in the closed position of the shutter 11 extend between a part, in this case the connecting piece 5 of the membrane 7 to the shutter 11, and a piece 20 to cap the extensible portion 6B of the thermal probe 6. The piece 20 forming the cap and the connecting piece 5 are mounted to slide interlockingly relative to each other. In the examples shown, this cap of the expandable portion 6B of the thermal probe 6 affects the shape of a cup. The expandable thermal probe 6 is itself housed inside the housing 2 of the actuator 1, inside the compartment 2A placed in communication via the part 5 with the circuit. This thermal probe 6 comprises a probe body 6A from which more or less protrudes a rod, movable as a function of temperature, and forming the expandable portion 6B of the probe 6. Such thermal probes 6 are well known to those skilled in this art. art. The rod 6B is driven by the expansion of a wax housed in the body and which, depending on the temperature, causes a more or less significant output of the stem of the body.

The piece 20 that caps the extensible portion 6B of the thermal probe 6 is therefore in the form of a cup provided near its center with a recess for accommodating the expandable portion 6B of the thermal probe 6. This cup extends to the right of said housing by an axial projection whose role will be described below.

Two springs 8, 9 are arranged one, shown at 8, on one side, the other, shown at 9, on the other side of a piece 14, said intermediate, positioned inside the housing 2 of the actuator 1, the spring 8 being disposed between the part 20 capping the extensible part 6B of the probe 6 and said intermediate part 14, the other spring 9 extending between said intermediate part 14 and the connecting piece 5 of the membrane 7 to the shutter 11.

The presence of two springs makes it possible to guarantee an always identical behavior of extension, or respectively retraction of the extensible part. of the probe as a function of the temperature variations due to the constant prestressing exerted on the extensible part of said probe.

In the examples shown, the intermediate part 14 has the shape of two ducts 15, 16 held coaxial by a generally radial connection 17 in one piece with said ducts 15, 16. The inner duct 16 is snapped onto the projection 26. axial portion of the piece 20 covering the extensible portion 6B of the probe 6 described above while the outer conduit is provided at one of its ends with a radial flange 18 forming a bearing surface of one of the springs , in this case the spring 8, and at its other end of notches 19 bearing against one face of the cap 20. Thus, the first spring 8 extends between the piece 20 to cap the extensible portion of the thermal probe 6 and the intermediate part 14 while the second spring 9 extends between the intermediate part 14 and the part 5 integral with the diaphragm serving to connect the diaphragm with the obturator 11. The spring 9 is here of lower force than the spring 8. Thus, the variation of the dimensions of the extensible part of the probe 6 makes it possible, in a first step, to generate a compression of the spring 9 to a position in abutment of the intermediate part 14 and then, in a second step, a compression of the spring 8 when continuing to extend the probe. At low temperature, when the probe is of minimum length, it is essentially the spring 9 of the lowest value that is biased during a deformation of the membrane in the direction of an opening of the shutter. This preloading of the springs modifies the threshold for triggering the deformation of the membrane under the effect of the pressure prevailing inside the compartment 2A of the actuator housing. The greater the length of the extensible portion of the probe, the greater the pressure, in this case the vacuum, to reign inside the compartment 2A of the casing 1 of the actuator to generate a deformation of the membrane is important. It can thus be seen that the deformation of the extensible portion of the probe occurring during an increase in temperature, at negative temperatures, the extensible portion of the probe is of short length, leading to low prestressing of the springs so that the pressure, in this case the depression, necessary for the deformation of the membrane is low pressure. Conversely, when the temperature increases, the length of the extensible portion of the probe increases, causing significant prestressing of the springs then requiring pressure, in this case again a depression, greater in the compartment 2A , to allow the deformation of the membrane. Due to such conditions, it is possible to obtain a deformation of the membrane at negative temperatures with a low vacuum inside the compartment 2A of the housing 1 of the actuator to control an opening of the inlet 25 of supply air circuit and to obtain, at high temperatures, the same opening of said inlet when the filter is clogged. Thus, the shutter can be controlled from the closed position to the open position by deformation of the membrane in first conditions where the temperature outside the circuit is -10 ° C and the air intake line of the circuit has a pressure drop of at least 35 millibars and in second conditions where the temperature is a positive temperature and / or the air intake line of the circuit has a pressure drop of at least 85 millibars. It is thus found that for the same pressure prevailing inside said circuit on the air intake line of said circuit, the opening of the additional air supply inlet will be controlled or not according to the temperature prevailing at outside the circuit.

In the embodiment shown in Figure 1, the design of such a gaseous fluid supply device is simplified since a portion of the actuator housing of the feed device is common to the housing of the filter device. This results in a simplification of the overall design. In this case, the casing 2 of the gaseous fluid supply device is extended to provide additional air supply input to the circuit made in one piece with a portion of the actuator housing. This solution makes it possible to guarantee perfect adaptation of the shutter 11 to the air supply inlet 25 of the circuit. The integration of such a filter device on an existing gaseous fluid circulation circuit is effected via the inlet 22 and the outlet 23 serving to connect the filtration device to said circuit. The feeding device gaseous fluid is thus previously mounted on the filter device and connected thereto. The deformable membrane 7 positioned inside the casing 2 of the actuator is deformed as a function of the pressure, in this case the vacuum, prevailing downstream of the filter equipping the filtration device.

Claims (12)

Device for supplying gaseous fluid to a gaseous fluid circulation circuit at at least one gaseous fluid supply inlet (22, 23), this device comprising at least one pneumatic actuator (1) and a shutter (11) of the or at least one gaseous fluid supply inlet (25) of the circuit, said actuator (1) being in the form of a compartmentalized housing (2) (2A, 2B) by a membrane (7), this housing comprising on the one hand means (3) for connecting one (2A) of its compartments (2A, 2B) to said circuit, on the other hand means (4) for connecting the membrane (7) to the shutter (11) of at least one input (25) circuit, said membrane (7), coupled to the shutter (11), being a movable membrane, capable of being deformed by the pressure variations prevailing at the inside the compartment (2A) of the housing (2) connectable to said circuit, to allow, during its deformation, the opening of said input (25) circuit, this m embrane (7) being biased in the closed position of the shutter (11) by elastically deformable means (8, 9), the elastically deformable means (8, 9) recalling the diaphragm (7) in the closed position of the shutter ( 11) being prestressed by means of at least one temperature-expandable thermal probe (6), such as that prevailing outside and / or inside the gaseous fluid circulation circuit,
characterized in that the compartment (2A) of the housing (2), connectable to said circuit, and adapted to be subjected to a pressure variation in the state connected to said circuit, houses the thermal probe (6) and the means (8, 9) elastically deformable reminding the membrane (7) in the closed position of the shutter (11), said means (8, 9) elastically deformable being interposed between the probe (6) and the thermal membrane (7) coupled to the shutter (11). Device for supplying gaseous fluid according to Claim 1,
characterized in that the means (8, 9) elastically deformable reminding the membrane (7) in the closed position of the shutter (11) comprise at least two springs (8, 9). Device for supplying gaseous fluid according to claim 2,
characterized in that the springs (8, 9) are arranged one (8) on one side, the other (9) on the other side of a so-called intermediate piece (14), positioned at the inside the spring compartment (2A) of the housing (2) of the actuator, one (8) of the springs being disposed between the extensible portion (6B) of the probe (6) or a piece (20) extensible portion (6B) of the thermal probe (6) and said intermediate piece (14), the other (9) of the springs extending between said intermediate piece (14) and the movable membrane (7) or a piece (5) ) integral in displacement of said membrane (7). Device for supplying gaseous fluid according to claim 3,
characterized in that the extensible thermal probe (6), housed inside said spring compartment (2A) (8, 9) of the housing (2) of the actuator (1), comprises a body (6A) of probe from which protrudes a rod, of variable length depending on the temperature, forming the expandable portion (6B) of the probe (6), this expandable portion (6B) of the probe (6) being capped by a piece (20) and in that the intermediate piece (14) has the shape of two ducts (15, 16) held coaxial by a generally integral radial connection (17) with said ducts (15, 16), the duct (16). interior slips on an axial projection (26) of the piece (20) covering the extensible portion (6B) of the probe (6) while the outer conduit (15) is provided with a radial flange (18) forming bearing surface of one (8) springs. Device for supplying gaseous fluid according to one of claims 1 to 4,
characterized in that the means (3) for connecting the spring compartment (2A) with springs (8, 9) of the housing (2) of the actuator (1) to the circuit and the means (4) for connecting the diaphragm ( 7) to the shutter (11) of a circuit input (25) are common over at least a part of their length. Device for supplying gaseous fluid according to claim 5,
characterized in that the means (4) for connecting the membrane (7) to the shutter (11) comprise at least one tubular piece (5) projecting from the less partially of the housing (2) of the actuator (1) and passing through the membrane (7) connected to said piece (5) sealingly forming a flange around said piece (5), this piece (5) tubular, coupled to the shutter (11), such as a shutter, by a connecting arm, being driven by an axial reciprocating movement towards the inside or the outside of the housing (2) under the effect of the deformation of the membrane (7). Device for supplying gaseous fluid according to Claim 6,
characterized in that the tubular piece (5) opens at one of its ends in the compartment (2A), said springs (8, 9) of the housing (2) and is connectable by its other end, directly or by the intermediate of a connecting piece (12) to a zone (27) for suction or vacuum of the circuit. Device for supplying gaseous fluid according to one of Claims 6 and 7,
characterized in that the tubular piece (5) has, at or near its end housed in the compartment (2A) said springs of the housing (2) of the actuator (1), a shoulder (13) coming from the one of its faces bearing against a wall of the housing (2) of the actuator (1) in the closed position of the shutter (11) with the interposition of said membrane (7) and delimiting by its other face a surface of support means (9) elastically deformable return of the membrane (7) in the closed position of the shutter (11). Gaseous fluid circulation circuit, in particular an air motor of an internal combustion engine, said circuit being equipped with at least one inlet (22) of so-called main air, a filter air filter l air from said inlet (22) and an inlet (25) of additional air closable preferably disposed downstream or in line with the air filter,
characterized in that the additional air inlet (25) is controlled in opening by means of a gaseous fluid supply device according to any one of claims 1 to 8. Air filtration device in particular for air intake circuit of internal combustion engine, said device being in the form of a housing equipped, for its connection to the circuit, an inlet (22) and an outlet (23) of air, this housing enclosing a filter compartmentalizing the housing and filtering the air coming from the air inlet (22) of said housing before it is expelled from said housing through the air outlet (23), said housing having the right, in particular at the plumb or downstream of the filter, an additional inlet (25) for closing air,
characterized in that the additional air inlet (25) is controlled in opening by means of a gaseous fluid supply device according to any one of claims 1 to 8, the actuator of the device of supply of gaseous fluid being integrated in the housing of the air filtration device. An air filtration device according to claim 10, characterized in that the shutter of the gaseous fluid supply device is disposed outside the filtering device housing and moves outwardly of said housing during its operation. transition from the closed position to the open position of the additional air inlet (25). Air filtering device according to claim 10,
characterized in that the inlet (25) of additional air closable from the housing of the filter device is formed in one piece with the gaseous fluid supply device.

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