JP2014020302A - Vortex flow generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vortex flow generating device which suppresses disturbance of blowing flow from a nozzle 4 and, thereby, stabilizes a tumble flow in the vortex generating device 1 including the nozzle 4 for blowing-out intake air to an intake passage 3 and a rotary valve body 2 for opening and closing a blowing-out port 5 of the nozzle 4.SOLUTION: In a vortex flow generating device 1, there is a totally-closing time exposure portion 18 which is not covered from the downstream side with a valve part 10 even in the totally-closing state, on the port edge 9 of a blowing-out port 5 and, further, the totally-closing time exposure portion 18 retreats to the upstream side and assumes a part of a retreat portion 16 which is not located along a revolution orbital surface of the valve part 10. Thereby, the occurrence of one side leakage flow which occurs on the conventional vortex flow generating device can be prevented. Accordingly, such a state that one side leakage flow disturbs a blowing-out flow can be dissolved, therefore, the disturbance of the blowing-out flow from a nozzle 4 is suppressed and a tumble flow can be stabilized.

Description

  The present invention relates to a vortex generator that generates a vortex such as a tumble flow or a swirl flow in a combustion chamber of an internal combustion engine.

  Conventionally, vortex generators that employ a rotary valve body that enables pressure loss to be reduced by preventing the valve body from being present in the center of the intake passage in a state where no vortex is generated have been known. Yes (for example, see Patent Document 1).

  That is, as shown in FIGS. 7 and 8, the conventional eddy current generating apparatus 100 includes a nozzle 102 that blows intake air into the intake passage 101 and a rotary valve body 104 that opens and closes the outlet 103 of the nozzle 102. . The nozzle 102 is coaxially accommodated in a cylindrical cavity 105 constituting the intake passage 101 and blows intake air into the cylindrical cavity 105. Further, the valve body 104 includes a valve portion 107 that is driven to revolve so as to cover the mouth edge 106 of the outlet 103 from the downstream side, and a side plate 109 that connects the shaft 108 that forms the center of revolution and the valve portion 107.

Then, the valve body 104 revolves to a state where the valve portion 107 is set to a target state, and the intake air blowing flow is narrowed and biased to a part of the outlet 103 so as to vortex into the combustion chamber (not shown). Is generated.
Note that one side plate 109 is provided at each end of the valve unit 107 so as to form a U shape integrally with the valve unit 107, and is driven to rotate outside the nozzle 102.

Here, the mouth edge 106 is provided so as to be substantially flush along the revolution track surface of the valve portion 107. Then, the vortex generator 100 revolves the valve unit 107 along the mouth edge 106 on the downstream side, so that the blowout flow is between the fully open state where the blowout port 103 is not throttled and the fully closed state where the blowout port 103 is most restricted. The vortex flow is controlled by adjusting the squeezing method (hereinafter, with respect to the direction of the outlet 103 and the mouth edge 106, the side where the outlet flow is biased in the fully closed state is referred to as one side and the side opposite to the side where the outlet flow is biased. The side of the valve portion 107 where the doorway 110 exists is called the other side.)
Further, the cylindrical cavity 105 in which the nozzle 102 and the valve portion 107 are accommodated is disposed on the upstream side in the immediate vicinity of the combustion chamber, and is, for example, the inner periphery of the branch pipe of the intake manifold 111.

  By the way, the recent intake manifold 111 is made of resin as a material for weight reduction and cost reduction. For this reason, it is ideal that the gap is not set unnecessarily in terms of preventing leakage of intake air other than the blow-off flow in the fully closed state etc., but the gap is set in each part in consideration of the expansion and contraction of the resin. doing.

However, by setting a gap in each part, the following disturbance of the blowing flow occurs due to leakage of air other than the blowing flow in the fully closed state or the like.
For example, in the fully closed state, air leaking from the gap 113 between the valve portion 107 and the mouth edge 106 further passes through the gap 114 between the side plate 109 and the outer wall of the nozzle 102, and the outer wall of the nozzle 102 and the cylindrical cavity 105 enters the gap 115 between the inner wall 105 and the inner wall 105. The air that has entered the gap 115 blows out from the gap 116 between the downstream end of the lip 106 and the step on the cylindrical cavity 105 side, or from the gap 118 between the valve portion 107 and the raceway surface 117 on the cylindrical cavity 105 side. It is sucked by the flow and flows downstream of the valve portion 107.

  More specifically, the air that has entered the region formed on one side of the gap 115 flows into the downstream side of the valve portion 107 from the gap 116, and the air that has entered the region formed on the other side is The air flow in the region formed on one side of the gap 115 is referred to as a one-side leakage flow (see FIG. 8A) and formed on the other side. The air flow in the region thus formed is called the other side leakage flow (not shown)).

  As a result, the blown-out flow is disturbed by the one-side leakage flow flowing in from the gap 116, and the formation of the vortex flow is hindered. Furthermore, since the gaps 113 to 116 and the like of each part change according to the expansion and contraction of the resin, the disturbance state of the blowout flow also changes, and the vortex state also changes and is not stable (note that the other side leakage flow is the blowout flow. Since it can flow away to the downstream side of the valve portion 107, the influence of the other side leakage flow on the blowout flow is not so large.)

Japanese Patent No. 488541

  The present invention has been made to solve the above-described problems, and an object of the present invention is to generate eddy currents including a nozzle that blows intake air into an intake passage and a rotary valve body that opens and closes the nozzle outlet. In the apparatus, the vortex flow is stabilized by suppressing the disturbance of the blowout flow from the nozzle.

The vortex generator of the first invention includes the following nozzle and valve body.
First, the nozzle is coaxially accommodated in a cylindrical cavity that forms an intake passage that communicates with the combustion chamber of the internal combustion engine, and blows intake air into the cylindrical cavity. Next, the valve body has a valve portion that is driven to revolve so as to cover the mouth edge of the nozzle outlet from the downstream side, and the valve portion is revolved to a target state so that the outlet flow of the intake air is discharged. A vortex is generated in the combustion chamber by squeezing and biasing to a part of the periphery.

In addition, the vortex generator is provided so that the lip of the outlet is substantially flush along the revolving raceway surface of the valve part, and the valve part is revolved downstream along the lip of the outlet part. The vortex flow is controlled by adjusting the method of throttling the blowout flow between the fully open state where the mouth is not throttled and the fully closed state where the blowout port is most restricted.
In addition, there is a fully-closed exposed part that is not covered from the downstream side by the valve portion even in the fully closed state on the rim of the outlet, and further, the fully closed exposed part is retracted upstream. There is a retreat site that does not follow the revolving raceway surface.

  Accordingly, the one-side leakage flow (see FIG. 8A) can be merged with the flow of the intake air in the nozzle on the upstream side of the valve portion, or the one-side leakage flow can be prevented from occurring. For this reason, since the state where the one-side leakage flow disturbs the blowing flow can be eliminated, the disturbance of the blowing flow from the nozzle can be suppressed and the vortex flow can be stabilized.

Further, according to the second invention subordinate to the first invention, the retreating part is upstream of the non-retreating part which is substantially flush with the revolving raceway surface of the valve portion in the rim of the outlet. Retreats upstream from the end.
As a result, even in any closed state between the fully closed state and the fully open state, the one-side leakage flow is merged with the flow of the intake air in the nozzle on the upstream side of the valve section, or the one-side leakage flow is not generated. Can be blocked. For this reason, even in a closed state other than the fully closed state, it is possible to eliminate the state in which the one-side leakage flow disturbs the blowing flow.

It is a fragmentary perspective view of the intake manifold containing a vortex | eddy_current generator (Example). (A) is a partial perspective view showing a fully closed state of the eddy current generating device by a perspective view cut along II of FIG. 1, and (b) is a vortex generator by a perspective view cut by II of FIG. It is a fragmentary perspective view which shows the fully open state of (Example). It is sectional drawing which shows the fully closed state of an eddy current generator (Example). It is a front view which shows the fully closed state of an eddy current generator (Example). It is sectional drawing which shows the fully open state of an eddy current generator (Example). It is a front view which shows the fully open state of an eddy current generator (Example). (A) is sectional drawing which shows the fully closed state of an eddy current generator, (b) is a front view which shows the fully closed state of an eddy current generator (conventional example). (A) is the elements on larger scale of Drawing 7 (a), (b) is the elements on larger scale of Drawing 7 (b) (conventional example).

  The eddy current generator according to the embodiment will be described based on examples.

[Configuration of Example]
The structure of the eddy current generator 1 of an Example is demonstrated using FIGS.
The vortex generator 1 generates, for example, a tumble flow in a combustion chamber (not shown) of an internal combustion engine, and the valve body 2 of the vortex generator 1 has a suction passage 3 in a state where no tumble flow is generated. It is a rotary type that makes it possible to reduce pressure loss by not existing in the center.

  That is, the vortex generator 1 includes a nozzle 4 that blows intake air into the intake passage 3 and a rotary valve body 2 that opens and closes a blow-out port 5 of the nozzle 4. For example, the vortex generator 1 is disposed upstream of the combustion chamber. Provided in the branch pipe of the intake manifold 6. The intake manifold 6 is made of resin as a material for weight reduction and cost reduction. The valve body 2 is provided with a metal as a material, and the nozzle 4 is provided with a resin or a metal as a material.

First, the nozzle 4 is coaxially accommodated in the inner periphery of the branch pipe of the intake manifold 6 (hereinafter referred to as a cylindrical cavity 8), and blows intake air into the cylindrical cavity 8.
Further, the valve body 2 includes a valve portion 10 that is driven to revolve so as to cover the edge 9 of the outlet 5 from the downstream side, and a side plate 12 that connects the shaft 11 that forms the center of revolution and the valve portion 10. Then, the valve body 2 revolves the valve portion 10 to a target state and restricts the blown flow of the intake air around a part of the blowout port 5 to generate a tumble flow in the combustion chamber.

  One side plate 12 is provided at each end of the valve unit 10 so as to form a U shape integrally with the valve unit 10, and is driven to rotate outside the nozzle 4. In addition, torque for driving the valve portion 10 to revolve or rotationally drive the side plate 12 is obtained by an actuator 13 disposed at one end of the intake manifold 6 in the direction in which the branch pipes are arranged.

Here, the rim 9 of the outlet 5 is provided so as to be substantially flush along the revolution track surface of the valve portion 10.
And the eddy current generator 1 revolves the valve part 10 along the lip 9 on the downstream side, so that the blowout flow is between the fully open state where the blowout port 5 is not throttled and the fully closed state where the blowout port 5 is most restricted. The tumble flow is controlled by adjusting the method of throttling (hereinafter, with respect to the direction of the outlet 5 and the edge 9, the side where the outlet flow is biased in the fully closed state is referred to as one side, and the side opposite to the side where the outlet flow is biased) The side where the inlet / outlet port 14 of the valve portion 10 exists is called the other side.)

[Features of Examples]
The features of the eddy current generator 1 of the embodiment will be described.
First, the mouth edge 9 is composed of a retreating portion 16 that is retreated upstream and does not follow the revolving raceway surface, and a non-retreating portion 17 that is substantially flush with the revolving raceway surface of the valve portion 10. The retracted portion 16 includes a fully closed exposure portion 18 that is not covered from the downstream side by the valve portion 10 even in the fully closed state, and an intake flow parallel portion 19 that is parallel to the flow of intake air. Of the retracted parts 16, the fully-closed exposed part 18 recedes farther upstream than the upstream end 17 a of the non-retracted part 17.

  Therefore, most of the inside of the nozzle 4 on the downstream side of the upstream end of the receding portion 16 is opened to one side, and the cross section perpendicular to the intake air flow of the nozzle 4 has a U-shape. As a result, for example, in the fully closed state, on the upstream side of the valve portion 10, the intake passage 3 is partitioned on one side by the one side inner wall 21 of the cylindrical cavity 8 and on the other side and side by the nozzle 4. .

  An accommodation space 23 for accommodating the valve portion 10 is formed between the other side portion of the nozzle 4 and the other inner wall 22 of the cylindrical cavity 8, and the valve portion 10 is completely accommodated in the fully opened state. It is accommodated in the space 23 and does not exist in the intake passage 3. In addition, the downstream portion of the other inner wall 22 that forms the accommodation space 23 forms a track surface 24 along the revolution track surface of the valve portion 10. And the entrance / exit 14 of the valve part 10 is formed of the downstream edge of the track surface 24 and the upstream edge 17a. Further, a rotation gap 26 for rotating the side plate 12 is provided between the side portion of the nozzle 4 and the side inner wall 25 of the cylindrical cavity 8.

  Here, in the eddy current generating device 1, various gaps are provided in consideration of deformation accompanying expansion and contraction of the resin. That is, a gap 28 is provided between the valve portion 10 and the mouth edge 9. Further, in the rotation gap 26, gaps 29 and 30 are provided between the side plate 12 and the side portion of the nozzle 4 and between the side plate 12 and the side inner wall 25, respectively. A gap 31 is provided between the portion 10 and the track surface 24.

  As described above, in the fully closed state, the blowout flow is narrowed and biased to one side of the blowout port 5, and a tumble flow is generated in the combustion chamber. Further, the air leaking from the gap 28 passes through the gap 29 and returns again into the nozzle 4 or enters the accommodation space 23. Further, the air that has entered the housing space 23 flows from the gap 31 to the downstream side of the valve unit 10 and joins the blowout flow.

[Effects of Examples]
According to the eddy current generating apparatus 1 of the embodiment, the opening 9 of the outlet 4 of the nozzle 4 has the fully closed exposure portion 18 that is not covered from the downstream side by the valve portion 10 even in the fully closed state. Further, the fully-closed exposed portion 18 forms a part of the retracted portion 16 that is retracted upstream and does not follow the revolving raceway surface of the valve portion 10.
Thereby, generation | occurrence | production of the one side leak flow (refer Fig.8 (a)) which generate | occur | produced with the conventional eddy current generator 100 can be prevented. For this reason, since the state where the one-side leakage flow disturbs the blowing flow can be eliminated, the disturbance of the blowing flow from the nozzle 4 can be suppressed and the tumble flow can be stabilized.

In addition, the retreating portion 16 is retreated to the upstream side more greatly than the upstream end 17a of the non-retreating portion 17.
Thereby, even in any closed state between the fully closed state and the fully open state, it is possible to prevent the occurrence of one-side leakage flow. For this reason, even in a closed state other than the fully closed state, it is possible to eliminate the state in which the one-side leakage flow disturbs the blowing flow.

[Modification]
The aspect of the eddy current generator 1 is not limited to the embodiment, and various modifications can be considered.
For example, according to the eddy current generating device 1 of the embodiment, the retreating part 16 is composed of the fully closed exposure part 18 and the intake air flow parallel part 19, but is not limited to such an aspect. The fully closed exposure part 18 may include the non-retreating part 17, and the fully closed exposure part 18 may be constituted by the retreating part 16 and the non-retreating part 17.
Moreover, although the eddy current generator 1 of the embodiment generates a tumble flow in the combustion chamber, a swirl flow may be generated in the combustion chamber.

DESCRIPTION OF SYMBOLS 1 Eddy current generator 2 Valve body 3 Intake path 4 Nozzle 5 Outlet 8 Cylindrical cavity 9 Edge 10 Valve part 16 Retraction part

Claims (2)

A nozzle (4) coaxially accommodated in a cylindrical cavity (8) constituting an intake passage (3) leading to the combustion chamber of the internal combustion engine, and for blowing intake air into the cylindrical cavity (8);
The nozzle (4) has a valve portion (10) driven to revolve so as to cover the mouth edge (9) of the outlet (5) from the downstream side, and the valve portion (10) is revolved to a target state. And a valve body (2) for generating a vortex flow in the combustion chamber by narrowing and biasing the blowout flow of the intake air around a part of the blowout port (5),
The rim (9) of the outlet (5) is provided so as to be substantially flush with the revolution track surface of the valve portion (10), and the valve portion (10) is the mouth of the outlet (5). By revolving along the edge (9) on the downstream side, the way of restricting the outlet flow is adjusted between the fully open state where the outlet (5) is not restricted and the fully closed state where the outlet (5) is most restricted. In the eddy current generator that controls the eddy current,
The mouth edge (9) of the outlet (5) has a fully closed exposure part (18) that is not covered from the downstream side by the valve part (10) even in the fully closed state,
Furthermore, the swirl generator is characterized in that the fully closed exposure part (18) has a receding part (16) that recedes upstream and does not follow the revolving raceway surface. In the eddy current generator according to claim 1,
The receding part (16) is a non-retreating part (17) that is substantially flush with the revolving raceway surface of the valve part (10) in the rim (9) of the outlet (5). An eddy current generator characterized by retreating to the upstream side from the upstream end.

Images