JP2001234742A - Exhaust accelerating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve engine efficiency by accelerating exhaust gas decelerated by exhaust resistance. SOLUTION: A tapered first accelerating cylinder (17) and a second accelerating cylinder (21) are provided inside an exhaust cylinder (15). When exhaust gas accelerated by the first accelerating cylinder (17) is jetted from a first opening (16), exhaust gas is sucked from a through-hole (22) into a second opening (20) and is accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for promoting exhaust gas, and more particularly, to a device for promoting exhaust gas by accelerating an exhaust gas flow discharged from a heat engine.

[0002]

2. Description of the Related Art In a heat engine that generates exhaust gas to generate power, it is desirable from the viewpoint of engine efficiency that the exhaust gas be quickly discharged from the engine to the atmosphere.

[0003] However, in order to maintain the health and safety of personnel, there is a case where the exhaust path is extended without providing the exhaust gas discharge position immediately adjacent to the engine. In addition, a silencer, a catalyst device, and the like are often added to the exhaust path in order to prevent noise and consider the environment.

[0004] In such a case, there is a problem that the exhaust is hindered by the exhaust resistance generated due to the extension of the exhaust path and the addition of a muffler and a catalyst device, and the engine efficiency is reduced.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. By providing a simple structure of the exhaust gas promotion device in the exhaust gas path, the exhaust gas reduced by the exhaust resistance can be reduced. It is an object of the present invention to increase the flow rate, improve the exhaust efficiency, and thus increase the engine efficiency.

[0006]

In order to achieve this object, an exhaust promotion device according to the present invention has a connection portion with an exhaust pipe at one end, and an exhaust port for ejecting exhaust gas at the other end. An exhaust pipe having a first opening inside the exhaust pipe for ejecting exhaust gas sent from the exhaust pipe, and a cross-sectional area of a flow passage for accelerating an exhaust gas flow. A first acceleration cylinder having a tapered shape gradually decreasing in the downstream direction, and a chamber located between the first acceleration cylinder and the exhaust direction downstream of the first acceleration cylinder, forming a chamber between the first acceleration cylinder and the same as the first opening. Having a second opening having an axis, and a second accelerating cylinder having a tapered shape whose flow path cross-sectional area gradually decreases downstream in the exhaust direction in order to accelerate the exhaust gas flow, At least one that allows exhaust gas to pass in the downstream direction on the side wall surface A through hole is opened, and when exhaust gas accelerated by the first acceleration cylinder is ejected from the first opening, the exhaust gas is sucked into the second opening from the through hole. Features.

[0007] Exhaust gas discharged from the heat engine, passed through the exhaust pipe, and led to the exhaust promotion device is sent to the first acceleration cylinder in the exhaust cylinder. Here, since the first acceleration cylinder is formed in a tapered shape in which the cross-sectional area of the flow path through which the exhaust gas passes gradually decreases downstream in the exhaust direction, the exhaust gas that has entered the first acceleration cylinder is The exhaust gas accelerated in one accelerating cylinder is ejected from the first opening toward the second opening in a state where the exhaust gas is pressurized compared with the inside of the exhaust pipe.

Here, since the space formed between the first opening and the second opening communicates with the chamber, the space formed in the chamber around the exhaust gas flow ejected by the ejection is provided. Causes a negative pressure.

Therefore, by forming a through hole in the side wall surface of the first acceleration cylinder, the exhaust gas passes through the through hole in the downstream direction, and is sucked toward the second opening through the chamber. The Rukoto.

This is due to the ejector effect. Exhaust gas is ejected from the first opening toward the second opening, and is also sent from the through hole to the chamber while being accelerated by suction. The gas is jetted from the second opening on the exhaust gas flow jetted from one opening.

[0011] Further, since the exhaust gas discharged from the engine is in a pressurized state in the exhaust pipe, it is naturally discharged from the through hole and sent to the chamber. The exhaust gas sent to the chamber is accelerated and ejected from the second opening by an ejector effect.

Further, since the second accelerating cylinder is also formed in a tapered shape in which the cross-sectional area of the flow passage gradually decreases downstream in the exhaust direction, the exhaust gas sent into the chamber through the through-hole is the second accelerating cylinder. After being accelerated by the accelerating cylinder, it is ejected from the second opening.

That is, the first accelerator accelerates the exhaust gas flow mainly at the center of the first accelerator, and the exhaust gas near the side wall of the first accelerator, which becomes relatively slow due to the resistance to the sidewall, Since the gas is accelerated by being sucked into the chamber from the through hole and accelerated by the second acceleration cylinder, the flow rate of the exhaust gas flow is accelerated as a whole in the exhaust cylinder.

As a result, the exhaust gas promotion device according to the present invention can increase the flow rate of exhaust gas per unit time as a whole.

Here, when the output of the engine is large and the amount of exhaust gas is large, the exhaust gas accelerated by the first accelerating cylinder is discharged from the first opening toward the second opening. The flow velocity of the flow is sufficiently large, and the ejector effect can be effectively exerted and exhaust gas can be strongly sucked from the chamber.However, when the output of the engine is small and the amount of exhaust gas is small, the flow rate of the exhaust gas flow is small and the Exhaust gas cannot be effectively sucked. Also, if the flow rate of the exhaust gas flow is small, the exhaust gas ejected from the first opening may be dispersed in the chamber before reaching the second opening, which may hinder the exhaust efficiency.

In order to effectively exert the ejector effect, the exhaust gas flow of the exhaust gas ejected from the first opening flows into the second opening without being dispersed, and the exhaust gas in the chamber and the exhaust gas flow from the first opening are not dispersed. It is desirable that a contact area between the first opening and the exhaust gas flow formed between the second opening is large.

When the exhaust volume is large enough and the flow rate of the exhaust gas is large, even if the distance between the first opening and the second opening is long, most of the exhaust gas is not dispersed in the chamber and the exhaust gas is not dispersed in the chamber. The ejector flows into the two openings and the contact area between the exhaust gas in the chamber and the exhaust gas flow formed between the first opening and the second opening is increased, so that the ejector effect is effectively exhibited.

However, when the amount of exhaust gas is small and the flow rate of the exhaust gas is small, if the distance between the first opening and the second opening is increased, a part of the exhaust gas ejected from the first opening will become part of the chamber. The chamber is relatively pressurized by the dispersion, and the ejector effect cannot be effectively exhibited.

Therefore, as set forth in claim 2, at least one of the first acceleration cylinder and the second acceleration cylinder is disposed within the exhaust cylinder in accordance with the amount of exhaust discharged from the heat engine. By moving in the direction, the distance between the first opening and the second opening can be freely changed, so that the exhaust gas ejected from the first opening is dispersed in the chamber. The exhaust gas can be drawn toward the second opening without any change and the exhaust gas can be sucked from the inside of the chamber by the ejector effect caused by the flow.

That is, when the output of the engine is large and the displacement is large, the distance between the first opening and the second opening is long to effectively exert the ejector effect, while the output of the engine is small and the displacement is small. In this case, one or both of the first acceleration cylinder and the second acceleration cylinder are moved in the axial direction of the exhaust cylinder, and the distance between the first opening and the second opening is shortened to move into the chamber. Prevents exhaust gas from dispersing, and allows the exhaust gas ejected from the first opening to flow smoothly to the second opening to maximize the ejector effect. Can be prevented and exhaust resistance can be reduced.

In addition, as described in claim 3, a fin member for sending the exhaust gas sent to the exhaust pipe to the first opening while swirling the exhaust gas is provided upstream of the first opening. It is also preferable to provide them.

By providing the fin member on the upstream side of the first opening, the exhaust gas passes through the exhaust pipe while swirling. The exhaust gas ejected from the first opening by the swirl causes the exhaust gas to pass through the exhaust opening. The exhaust gas in the chamber is effectively sucked, and the ejector effect is more effectively exhibited.

Further, as described in claim 4,
It is also preferable to provide a spiral groove on the inner peripheral surface of the first acceleration cylinder.

By providing the spiral groove on the inner peripheral surface of the first acceleration cylinder, the same effect as the exhaust promotion device according to the third aspect, that is, the ejector effect can be more effectively achieved by the suction force generated by the vortex. Obtainable.

Further, as described in claim 5, it is preferable that dimples are formed on the inner peripheral surface of at least one of the exhaust cylinder, the first acceleration cylinder, and the second acceleration cylinder.

The quality of the exhaust efficiency depends on the magnitude of the exhaust resistance in the exhaust cylinder. However, by forming dimples on the inner peripheral surfaces of the exhaust cylinder, the first acceleration cylinder and the second acceleration cylinder, the exhaust efficiency is improved. The resistance when the gas passes through the exhaust pipe can be reduced, and the exhaust efficiency can be improved.

[0027]

FIG. 1 shows a first embodiment of an exhaust gas promotion device according to the present invention.

As shown in FIG. 1, the exhaust promotion device 10 according to the present embodiment has a connection portion 12 with an exhaust pipe 11 at one end, and an exhaust port 14 for ejecting exhaust gas 13 at the other end. The exhaust cylinder 15 is provided.

A first opening 16 for ejecting the exhaust gas 13 sent from the exhaust pipe 11 is provided inside the exhaust pipe 15.
A first accelerating cylinder 17 having a tapered shape in which the flow path cross-sectional area gradually decreases downstream in the exhaust direction to accelerate the flow velocity of the exhaust gas 13, and is located downstream of the first accelerating cylinder 17 in the exhaust direction; A chamber 18 is formed between the first accelerating cylinder 17 and
A second accelerating cylinder having a second opening 20 having the same axis as the first opening 16 and having a tapered shape in which a flow path cross-sectional area gradually decreases downstream in the exhaust direction in order to accelerate the flow rate of the exhaust gas 13. 21 are provided.

The exhaust gas 13 is provided on the side wall surface of the first acceleration cylinder 17.
A plurality of through-holes 22 that can pass through in the downstream direction are opened, and the exhaust gas 1 accelerated by the first acceleration cylinder 17 is opened.
When 3 is ejected from the first opening 16, the exhaust gas 13 is sucked into the second opening 20 from the through hole 22.

More specifically, the exhaust gas 13 sent to the exhaust acceleration device 10 through the exhaust pipe 11 firstly receives the first acceleration cylinder 1
7 The first accelerating cylinder 17 has, on the downstream side of the connecting portion 12, a tapered portion 17a whose cross-sectional area gradually increases downstream in the exhaust direction. The inner diameter of the tapered portion 17a is reduced. Since the diameter of the exhaust gas 13 is larger than that of the pipe 11, the exhaust gas 13 tends to expand, and the flow rate of the exhaust gas 13 is temporarily lower than that in the exhaust pipe 11.

After that, the exhaust gas 13 heading downstream in the first acceleration cylinder 17 is partially pressurized in order to prevent the exhaust gas 13 from being excessively pressurized in the first acceleration cylinder 17 and having an excessive exhaust resistance. Through hole 2 provided in the side wall of first acceleration cylinder 17
From 2 go naturally into the chamber 18. Further, the exhaust gas 13 is sucked into the chamber 18 and accelerated by the negative pressure generated in the chamber 18 as described later.

Most of the exhaust gas 13 sent to the first acceleration cylinder 17 goes to the first opening 16 and is accelerated by the taper formed by the first acceleration cylinder 17. The exhaust gas 13 accelerated and directed toward the first opening 16 is ejected from the first opening 16 toward the second opening 20, but immediately thereafter, a negative pressure is generated in the chamber 18 in proportion to the ejection speed. Cause. Due to such negative pressure, as described above, the through holes 2
After the exhaust gas 13 is sucked from the chamber 2 into the chamber 18, it is also accelerated in the second accelerating cylinder 21, is ejected from the first opening 16, and is ejected from the second opening 20 on the exhaust gas flow toward the second opening 20. I do.

That is, the first accelerating cylinder 17 mainly accelerates the exhaust gas flow in the central part of the first accelerating cylinder 17. Exhaust gas near the side wall of the first acceleration cylinder 17, which becomes relatively slow due to resistance with the side wall, is accelerated by being sucked into the chamber 18 through the through hole 22. On the other hand, the second accelerating cylinder 21 allows the exhaust gas ejected from the first opening 16 of the first accelerating cylinder 17 to pass as it is accelerated from the second opening 20 and accelerates the exhaust gas in the chamber 18. , And has a function of jetting out from the second opening 20.

FIG. 2 shows a second embodiment of the exhaust gas promotion device according to the present invention.

It should be noted that the structural features of the exhaust acceleration device according to the present embodiment relate only to the portion relating to the moving structure of the first or second acceleration cylinder, and the other structures are the same as those described in the first embodiment. Since the structure is the same as that of the promotion device 10, the same reference numerals are used for the common parts.

In the exhaust promotion device 30 according to the present embodiment, the distance between the first opening 17 and the second opening 20 can be freely adjusted by moving the second acceleration cylinder 21 in the exhaust cylinder 15 in the exhaust cylinder axial direction. It can be changed to

The exhaust promotion device according to the present embodiment includes a sensor 31 for detecting the flow rate of exhaust gas generated by the engine or the output of the engine, a motor 32 for moving the second acceleration cylinder 21 in the axial direction, a sensor, A controller 33 for controlling the operation of the motor 32 in accordance with the output from the motor 31. The controller 33 controls the distance between the first opening 16 and the second opening 20 in accordance with the displacement, thereby controlling the displacement. The exhaust gas flow is configured to be effectively accelerated.

That is, when the output of the engine is large and the amount of exhaust gas is large, the space between the first opening 16 and the second opening 20 is long, so that the exhaust gas flow ejected from the first opening 16 and flowing into the second opening 20 and the chamber 18 While the ejector effect is effectively exerted by increasing the contact area with the exhaust gas inside, the second acceleration cylinder 21 is moved in the exhaust cylinder axial direction in the exhaust cylinder 15 when the engine output is small and the displacement is small. Thus, by shortening the distance between the first opening 16 and the second opening 20, the exhaust gas 13 ejected from the first opening 17 can smoothly flow into the second opening 20 without being dispersed.

Here, the second accelerating cylinder 21 is, for example, a screw groove (not shown) provided in advance on the inner peripheral surface of the exhaust cylinder 15.
Then, a projection (not shown) provided on a portion of the second acceleration cylinder 21 to which the exhaust cylinder 15 is attached is loosely screwed, and the second acceleration cylinder 21 itself is moved by a structure rotated by the power of the motor 32. be able to.

The movement of the second accelerating cylinder 21 is controlled electrically by using a sensor or the like, but the accelerator for adjusting the output of the engine and the second accelerating cylinder 21 are linked by using a wire or the like. By using a moving structure, it can be controlled mechanically. In this case, the sensor 3
1, the motor 32 and the control device 33 become unnecessary.

The evacuation promotion device according to the present embodiment moves the second accelerating cylinder 21 in the axial direction of the accelerating cylinder 15 to adjust the distance between the first opening 16 and the second opening 20. If the substantial distance between the first opening 16 and the second opening 20 can be adjusted according to the displacement, for example, the first opening 1
The same effect as described above can be obtained also by providing a structure in which the cylindrical cylinder attached to the opening of No. 6 extends according to the displacement.

In the above embodiment, the second accelerating cylinder 21 is formed so as to be movable, but the first accelerating cylinder 17 or both the second accelerating cylinder 21 and the first accelerating cylinder 17 can be moved in the axial direction. It may be formed.

In the exhaust promotion devices according to the first and second embodiments described above, the fin member 34 as shown in FIG.
Can also be provided between.

The fin 34a of the fin member 34 is provided with a twist, and the exhaust gas 13 passing through the space between the fins 34a is sent to the first opening 16 while swirling, and from the first opening 16 to the second opening 20. It is spouted toward. At this time, the vortex of the exhaust gas 13 causes the exhaust gas 13 in the chamber 18 to be more strongly sucked in the direction of the second opening 20, thereby effectively exerting the ejector effect.

The same effect as described above can be obtained by digging a spiral groove on the inner peripheral surface of the first acceleration cylinder 17 instead of providing the fins 34.

Further, by forming dimples on the inner peripheral surfaces of the exhaust cylinder 15, the first acceleration cylinder 17, and the second acceleration cylinder 21, the exhaust resistance is reduced, and the engine efficiency is enhanced by promoting the exhaust. Can also. However, it is not always necessary to form dimples on all the inner peripheral surfaces of the exhaust cylinder 15, the first acceleration cylinder 17, and the second acceleration cylinder 21, and they may be provided on any one of the inner peripheral surfaces. Further, it is not always necessary to provide dimples in all regions of each inner peripheral surface, and dimples may be provided only in some specific regions.

[0048]

As described above, according to the present invention, by providing the exhaust promotion device having a simple structure in the exhaust path,
It is possible to increase the flow velocity of the exhaust gas reduced by the exhaust resistance, improve the exhaust efficiency, and increase the engine efficiency.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment of an exhaust acceleration device according to the present invention.

FIG. 2 is a sectional view of a second embodiment of the exhaust gas promotion device according to the present invention.

FIG. 3 is an external view of a fin member used for the exhaust promotion device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Exhaust acceleration device 11 Exhaust pipe 12 Connection part 13 Exhaust gas 14 Exhaust port 15 Exhaust tube 16 First opening 17 First acceleration cylinder 17a Tapered portion 18 Chamber 20 Second opening 21 Second acceleration cylinder 22 Through-hole 30 Exhaust acceleration device 31 sensor 32 motor 33 control device 34 fin member 34a fin

Claims (5)

[Claims] An exhaust promoting device for accelerating an exhaust gas flow to promote exhaust, comprising a connection portion with an exhaust pipe at one end and an exhaust port at the other end for ejecting exhaust gas. An exhaust pipe is provided. Inside the exhaust pipe, a first opening for ejecting exhaust gas sent from the exhaust pipe is provided. A first acceleration cylinder having a tapered shape gradually decreasing downstream, and a chamber located between the first acceleration cylinder and the exhaust direction downstream of the first acceleration cylinder, forming a chamber between the first acceleration cylinder and the same axis as the first opening. And a second acceleration cylinder having a tapered shape in which the cross-sectional area of the flow path gradually decreases downstream in the exhaust direction in order to accelerate the exhaust gas flow. The wall has at least one transparent surface through which exhaust gas can pass in the downstream direction. Are opened, and when the exhaust gas accelerated by the first acceleration cylinder is ejected from the first opening, the exhaust gas is sucked into the second opening from the through hole. Exhaust promotion device. 2. The method according to claim 1, wherein at least one of the first accelerating cylinder and the second accelerating cylinder moves in the exhaust cylinder axial direction in accordance with an amount of exhaust discharged from the heat engine. 2. The exhaust enhancement device according to claim 1, wherein a distance between the first opening and the second opening can be freely changed. 3. 3. A fin member for feeding the exhaust gas to the first opening while swirling the exhaust gas sent to the exhaust pipe is provided upstream of the first opening. Or the exhaust promotion device according to 2. 4. The exhaust acceleration device according to claim 1, wherein a spiral groove is dug in an inner peripheral surface of the first acceleration cylinder. 5. The exhaust promotion according to claim 1, wherein a dimple is formed on an inner peripheral surface of at least one of the exhaust cylinder, the first acceleration cylinder, and the second acceleration cylinder. apparatus.