JP2021522439A - Inhalation circuit connector - Google Patents

Abstract

The present invention is a suction circuit connector for a heat engine particularly for an automobile, which includes a tubular segment (3) for circulating outside air and a flow shutter (5) for adjusting air circulation, and circulates gas. (9) relates to a connector characterized by projecting into a downstream segment immediately proximal to the shutter.
[Selection diagram] Fig. 1

Description

The present invention relates to a suction circuit connector. The present invention also relates to a combustion engine or heat engine provided with this type of suction circuit connector. The present invention also relates to an automobile provided with this type of combustion engine.

Combustion engines, especially those installed in automobiles, require outside air that is guided to the combustion chamber through an intake circuit for operation. When fuel is burned in the combustion chamber, gas is generated and discharged through the exhaust circuit.

Combustion or heat engines generally include an exhaust gas recirculation (EGR) system. This type of EGR system generally helps reduce pollution emissions and / or optimize engine output. Some percentage of the exhaust gas (also called the EGR rate) is retransmitted from the engine exhaust circuit to the intake circuit. Hereinafter, the exhaust gas retransmitted from the exhaust circuit of the engine to the intake circuit is referred to as EGR gas in the present specification.

The EGR system allows the gas burned during the previous combustion to be reintroduced into the combustion chamber. In this type of system, the EGR gas needs to be mixed with the outside air. For this purpose, a mixer (hereinafter referred to as an air-EGR mixer in the present specification) is usually used. However, this type of mixer is very bulky compared to other elements of the combustion engine. In addition, this type of mixer causes pressure loss in the intake circuit of the combustion engine.

An object of the present invention is to provide a system that solves the above-mentioned drawbacks and improves a system known from the prior art. In particular, the present invention proposes a valve system that allows the fabrication of combustion engines without an air-EGR mixer.

To this end, the present invention comprises a tubular segment intended for the circulation of outside air and a fluid flow obturator intended for regulating the circulation of air, especially for automobiles. In a suction circuit connector for an engine, relating to a connector characterized in that a conduit intended for gas circulation projects into a downstream segment of the obturator and discharges fluid immediately proximal to the obturator. ..

Advantageously, the conduit intended for gas circulation is capable of discharging fluid in the upstream direction of the segment.

Advantageously, the conduit intended for gas circulation is capable of discharging fluid into the segment within the region of high air flow and strong turbulence produced by the flow obturator.

The protruding discharge opening of the conduit may be obliquely oriented within the segment and is 10 ° -80 ° between the main direction of the segment and the main direction of the conduit, especially about 10 ° -80 °, for example about. At an angle of 45 °, in particular, a second flow of gas circulating in the conduit is introduced as a backflow or countercurrent into the first flow of air circulating in the tubular segment.

The flow obturator can have a closure rate of 90% or less.

The conduit can project into the tubular segment, for example, by a protrusion height of less than half the diameter of the tubular segment, eg, about a quarter of the diameter of the tubular segment.

The distance from the end of the conduit protruding into the tubular segment to the flow obturator in the direction perpendicular to the main direction of the tubular segment can be, for example, less than half the diameter of the tubular segment.

The distance from the end of the conduit protruding into the tubular segment to the flow obturator in the main direction of the tubular segment should be, for example, 0.5 to 2 times the diameter of the flow obturator, eg, about half the diameter of the flow obturator. Can be done.

The shape of the cross section of the protrusion of the conduit can be oval in the plane including the main direction of the tubular segment.

The present invention also relates to a combustion engine with the connectors defined above.

Finally, the present invention relates to an automobile with a combustion engine as defined above or a connector as defined above.

It is a figure which shows one Embodiment of a suction circuit connector schematicly. It is a figure which shows schematic the suction circuit connector of FIG. 1 at the time of operation when EGR gas is not introduced. It is a figure which shows schematic the suction circuit connector of FIG. 1 at the time of operation when EGR gas is introduced.

The intake circuit of a combustion engine may include an intake valve intended to regulate the flow rate of oxidant air entering the combustion chamber. The present invention proposes that the presence of this type of intake valve in an engine can be utilized to eliminate the use of an air-EGR mixer in the engine. Here, the intake valve is intended to act as a mixer for air and EGR gas, in addition to its role of regulating the flow rate of oxidant air. At that time, the intake valve also acts as a valve for measuring the EGR gas. To that end, a conduit intended to guide the EGR gas is directly connected to the intake valve at a properly selected position. This makes it possible to introduce the EGR gas into the intake circuit while mixing it with the outside air. As a result, engines with this type of valve do not require an air-EGR mixer and are therefore particularly reduced in size.

Hereinafter, the term "intake circuit connector" refers to a valve system comprising a conduit, particularly a conduit intended to guide EGR gas.

FIG. 1 schematically shows an embodiment of the suction circuit connector 1. The suction circuit connector 1 includes a tubular segment 3. The tubular segment 3 is intended for circulation or passage of a first fluid, preferably air, more preferably outside air. The suction circuit connector 1 also includes a flow rate obturator 5. The flow obturator 5 is intended to regulate the circulation or flow (referred to as the first flow) of a first fluid, eg, air, within the tubular segment 3. The circulation direction of the first flow of the first fluid in the tubular segment 3 is represented by the arrow 7. Further, the suction circuit connector 1 includes a conduit 9 connected to a tubular segment 3 downstream of the flow obturator 5. The conduit 9 projects downstream into the tubular segment 3 and discharges fluid downstream of the flow obturator 5 and immediately proximal to it. The conduit 9 is intended for the circulation of a second fluid, preferably EGR gas, and the introduction of the second fluid into the tubular segment 3. The circulation direction of the second fluid flow (referred to as the second flow) in the conduit 9 is represented by the arrow 11.

The term "outside air" should be understood as the air that is first introduced into the intake circuit, that is, the air that has never been previously delivered to the combustion chamber.

As the first fluid circulates in the tubular segment 3, there is an inherent pressure drop within the tubular segment 3. Advantageously, the conduit 9 is located in the region of high air flow and / or pressure loss and / or turbulence or strong turbulence produced by the flow obturator 5, downstream of the flow obturator 5 and in the tubular segment 3. Dissipate fluid. When the second fluid is introduced into this turbulence in this way, the pressure loss associated with the introduction of the second fluid into the tubular segment 3 can be minimized. This also makes it possible to optimize the mixing of the first fluid and the second fluid.

The conduit 9 projects into the tubular segment 3 and is connected to the tubular segment 3. The conduit 9 is installed, for example, by punching in the tubular segment 3, that is, in the body of the suction circuit connector 1.

The conduit 9 projects into the tubular segment 3 by the protrusion height h. The protruding height h of the conduit 9 into the tubular segment 3 is, for example, half or less of the diameter D of the tubular segment 3. Preferably, the protruding height h of the conduit 9 into the tubular segment 3 is, for example, about a quarter of the diameter D of the tubular segment 3.

Advantageously, the conduit 9 discharges the fluid in the upstream direction of the tubular segment 3. The protruding discharge opening of the conduit 9 is advantageously oriented obliquely within segment 3.

The tubular segment 3 extends in the main direction Δ1. The conduit 9 extends in the main direction Δ2. The main direction Δ2 of the conduit 9 forms an angle Φ with the main direction Δ1 of the tubular segment 3.

Advantageously, the conduit 9 has an angle Φ such that the main direction Δ1 of the tubular segment 3 and the main direction Δ2 of the conduit 9 form an angle Φ of 10 ° to 80 °, particularly about 10 ° to about 80 °, preferably about 45 °. It is connected to the tubular segment 3. The angle Φ formed by the main direction Δ1 of the tubular segment 3 and the main direction Δ2 of the conduit 9 is such that the second flow of the second fluid circulating in the conduit 9 is the first fluid circulating in the tubular segment 3. It is selected to be introduced as a backflow or countercurrent into the first stream. As a result, the first flow and the second flow interact with each other, which makes it possible to obtain a mixture of the first fluid and the second fluid.

According to an exemplary embodiment, the suction circuit connector 1 comprises an oxidant suction valve and is intended to be used in a combustion engine. The tubular segment 3 is intended to guide air, such as outside air, especially for inhalation of oxidant air. The conduit 9 is intended to guide a gas, such as EGR gas. The conduit 9 may also be intended, for example, to guide blow-by (representing degassing) or fuel vapor.

Preferably, the valve closure rate of the suction circuit connector 1 is low. As a result, it is possible to avoid clogging of the suction circuit connector 1 due to the introduction of the EGR gas into the tubular segment 3.

The expression "close rate" should be understood as the percentage of closure compared to the open position of the flow obturator 5 corresponding to the stationary position. The closing rate of 0% corresponds to the open position of the flow rate obturator 5, and the closing rate of 100% corresponds to the completely closed position of the flow rate obturator 5.

Advantageously, the closure rate of the flow rate obturator 5 is 90% or less, preferably 50% or less, and more preferably 20% or less. As a result, the suction circuit connector 1 is unlikely to be closed.

The distance d1 from the end of the conduit 9 protruding into the tubular segment 3 to the flow rate obturator 5 in the direction perpendicular to the main direction Δ1 of the tubular segment 3 is, for example, half or less of the diameter D of the tubular segment 3. .. Preferably, the distance d1 is, for example, about a quarter of the diameter D of the tubular segment 3.

The distance d2 from the end of the conduit 9 protruding into the tubular segment 3 to the flow rate obturator 5 in the main direction Δ1 of the tubular segment 3 is, for example, 0.5 to 2 times the diameter D5 of the flow rate obturator 5. Preferably, the distance d2 is, for example, about half the diameter D5 of the flow rate obturator 5. Advantageously, the conduit 9 is located as close as possible to the turbulent region of the tubular segment 3 where this turbulence is generated by the flow obturator 5.

As shown in FIG. 1, distances d1 and d2 are measured, for example, between the center of the flow obturator 5 and the center of the cross section of the end of the conduit 9 projecting into the tubular segment 3.

The shape of the cross section of the protrusion of the conduit 9 is, for example, an oval shape in the plane P including the main direction Δ1 of the tubular segment 3, and maximizes the angle formed by this plane and the main direction Δ2. The diameter of the cross section of the protrusion of the conduit 9 is, for example, about D / 5. The shape and dimensions of the cross section of the protrusion of the conduit 9 are selected, for example, according to the EGR gas flow requirement.

According to an exemplary embodiment, the valve 1 is of the type with flaps. In that case, for example, the flow rate obturator 5 is a flap.

Hereinafter, the operation of the suction circuit connector 1 such as that of FIG. 1 will be described with reference to FIGS. 2 and 3.

FIG. 2 schematically shows a suction circuit connector 1 in operation when a second fluid, such as EGR gas, is not introduced into the tubular segment 3.

The flow rate obturator 5 is in the open position, that is, in the stationary position.

The valve 21, which is not shown in FIG. 1 and is shown in FIG. 2, is an end within the conduit 9 that is upstream of the conduit 9, i.e., opposite to the end of the conduit 9 that projects into the tubular segment 3. Is located in.

The conduit 9 is closed by a valve 21. Therefore, the second fluid is not introduced into the tubular segment 3.

Arrow 23 represents the first flow of the first fluid within the tubular segment 3. As schematically shown in FIG. 2, the presence of the conduit 9 connected to the tubular segment 3 and projecting into the tubular segment 3 causes a small pressure loss within the tubular segment 3. Therefore, the valve 1 operates as if there were no conduit 9.

However, there may be slight airflow turbulence within the tubular segment 3, especially in the area 25 upstream of the end of the conduit 9 projecting into the tubular segment 3.

Advantageously, the protruding height h of the conduit 9 into the tubular segment 3 can be reduced so as to reduce the phenomenon of airflow disturbance within the tubular segment 3. In particular, by making a compromise between the angle Φ formed by the main direction Δ1 of the tubular segment 3 and the main direction Δ2 of the conduit 9, the tubular segment 3 guarantees the optimum mixing quality of the first fluid and the second fluid. The protrusion height h that minimizes the phenomenon of airflow disturbance in the segment 3 can be selected.

FIG. 3 schematically shows a suction circuit connector 1 in operation when a second fluid, such as an EGR gas, is introduced into the tubular segment 3.

The flow rate obturator 5 is inclined by an angle ω with respect to the main direction Δ1 of the tubular segment 3. The inclination angle ω of the flow rate obturator 5 with respect to the main direction Δ1 of the tubular segment 3 is, for example, 0 ° to 20 °, for example, about 20 °.

Arrow 33 represents the first flow of the first fluid within the tubular segment 3. As shown by the arrow 33 in FIG. 3, the tilted posture of the flow rate obturator 5 with respect to the main direction Δ1 of the tubular segment 3 causes a pressure loss in the tubular segment 3. This creates a region of reduced pressure, which allows the introduction of a second fluid into the tubular segment 3.

Arrow 35 represents a second flow of the second fluid in the conduit 9. The conduit 9 allows the second fluid to be introduced into the tubular segment 3 during the airflow disturbance of the first fluid. After the introduction of the second flow of the second fluid into the tubular segment 3, the first and second fluid flows downstream of the end of the conduit 9 projecting into the tubular segment 3 are shown by arrows 37 in FIG. There is almost no pressure loss as shown by. Therefore, the suction circuit connector 1 makes it possible to obtain a homogeneous mixture of a first fluid such as air and a second fluid such as EGR gas at its outlet. In addition, mixing the first fluid with the second fluid reduces pressure loss. In this way, the suction circuit connector 1 functions as a mixer valve.

One of the advantages of the suction circuit connector as described with reference to FIGS. 1 to 3 is that it can be used as a flow rate regulator for the first fluid or as a mixer that mixes the first fluid and the second fluid. Is also to work. This type of suction circuit connector makes it possible to eliminate the use of an air-EGR mixer, for example when placed in a combustion engine. At the outlet of the suction circuit connector, a homogeneous mixture of a first fluid such as air and a second fluid such as EGR gas is produced, while the pressure drop in the suction circuit of the first fluid is minimal. It is suppressed to.

1 to 3 show a suction circuit connector when the main direction Δ2 of the conduit 9 is positioned in a plane perpendicular to the plane of the flow rate obturator 5.

Reference numeral α is formed between the plane of the obturator 5 when the flow rate obturator 5 is in the stationary position, that is, the open position, and the orthogonal protrusion of the conduit 9 in the main direction Δ2 on the plane perpendicular to the direction Δ1. Indicates the angle. In one exemplary embodiment of FIGS. 1 to 3, the angle α is about 90 °.

According to one variant, the main direction Δ2 of the conduit 9 can be positioned in the plane of the flow obturator 5. Here, the angle α is 0 °. Any other orientation of the main direction Δ2 of the conduit 9 can also be selected with respect to the plane of the flow obturator 5. The value of the angle α is selected in the range of 0 ° to 360 °, depending on the geometry of the suction circuit connector upstream of the flow obturator 5. The optimum value for the angle α is determined, for example, by aerodynamic calculation.

The present invention has been described in connection with FIGS. 1 to 3 when the valve 1 is of a type having a flap. According to one modification, the valve 1 may be of a type having a sliding gate.

The suction circuit connector as described with reference to FIGS. 1 to 3 can be used in a combustion engine or a heat engine 41. This type of suction circuit connector makes it possible to eliminate the use of air-EGR mixers in combustion engines. As a result, a more compact combustion engine is realized.

The present invention also relates to a combustion engine 41 of this type or an automobile 51 including a suction circuit connector as described with reference to FIGS. 1-3.

A connector as described with reference to FIGS. 1-3 can be used in any kind of application that requires mixing of two fluids, with the flow rate of one of the two fluids regulated by a valve. NS. For example, this type of connector can also be used in boilers.

Claims (11)

A suction circuit connector for a heat engine, particularly for automobiles, comprising a tubular segment (3) for circulating outside air and a flow obturator (5) for regulating air circulation, for gas circulation. A connector comprising a conduit (9) projecting into the segment downstream of the obturator, immediately proximal to the obturator, to expel fluid. The connector according to claim 1, wherein the conduit (9) for the circulation of the gas discharges a fluid toward the upstream direction of the segment (3). The conduit (9) intended for the circulation of the gas discharges fluid into the segment (3) within the region of high air flow and strong turbulence produced by the flow obturator (5). The connector according to claim 1 or 2. The protruding discharge opening of the conduit (9) faces obliquely within the segment (3), and the main direction (Δ1) of the segment (3) and the main direction (Δ2) of the conduit (9). An angle (Φ) of 10 ° to 80 °, for example about 45 °, is formed between the two, and in particular, a second flow of gas circulating in the conduit (9) circulates in the tubular segment (3). The connector according to any one of claims 1 to 3, wherein the connector is introduced as a backflow or a counterflow into the first flow of air. The connector according to any one of claims 1 to 4, wherein the flow rate obturator (5) has a closure rate of 90% or less. The tubular segment (3) has a protrusion height (h) of not more than half the diameter (D) of the tubular segment (3), for example, about a quarter of the diameter (D) of the tubular segment (D). ), The connector according to any one of claims 1 to 5. The distance (d1) from the end of the conduit (9) protruding into the tubular segment (3) to the flow obturator (5) in a direction perpendicular to the main direction (Δ1) of the tubular segment (3). ) Is a half or less of the diameter (D) of the tubular segment (3), according to any one of claims 1 to 6. The distance (d2) from the end of the conduit (9) protruding into the tubular segment (3) to the flow rate obturator (5) in the main direction (Δ1) of the tubular segment (3) is the said. Any one of claims 1 to 7, characterized in that it is 0.5 to 2 times the diameter (D5) of the flow rate obturator (5), for example, about half the diameter (D5) of the flow rate obturator (5). The connector described in. Claims 1 to 8 wherein the shape of the cross section of the protrusion of the conduit (9) is oval in a plane (P) including the main direction (Δ1) of the tubular segment (3). The connector according to any one of the above. A combustion engine (41) comprising the connector according to any one of claims 1 to 9. An automobile (51) comprising the combustion engine according to claim 10 or the connector according to any one of claims 1 to 9.

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