JP2016044620A - Gas forcible suction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas forcible suction device capable of mechanically and forcibly suctioning high-temperature gas such as exhaust gas of an internal combustion engine, and improving combustion efficiency, with a simple structure.SOLUTION: A gas forcible suction device has an inlet part 10, an outlet part 20 and a large-diameter intermediate part 30. In the intermediate part 30, a tapered swirl flow generation cylindrical part 40 is provided. In the swirl flow generation cylindrical part 40, a projection 421 projecting radially inward and extending in spiral shape is formed. On the inlet part side of the swirl flow generation cylindrical part 40, a plurality of outflow ports 411 having a small opening area is formed in a circumferential direction. An outlet part side end side 43e of the swirl flow generation cylindrical part 40 communicates with the outlet part 20 inwardly.SELECTED DRAWING: Figure 3

Description

The present invention relates to a technique for forcibly sucking and discharging a gas such as an exhaust gas of an internal combustion engine.

In recent years, in order to prevent global warming, reduction of CO ₂ emissions has been demanded. In addition, with the rise in crude oil prices, reducing fuel consumption is recognized as an important issue. In addition, due to the exhaust gas regulations of automobiles, the obligation to install exhaust catalyst devices and DPF for particulate combustion, etc., has been strengthened, and mounting such devices in the exhaust system has an adverse effect on the exhaust efficiency of engine combustion exhaust gas. Yes.
Here, the engine can reduce the engine pressure and improve the combustion efficiency by efficiently discharging the exhaust gas. For this purpose, it is necessary to forcibly suck the combustion exhaust gas of the engine to the exhaust side and reduce the pressure on the exhaust side.
However, for example, when the accelerator is frequently opened and closed, such as in an automobile, and the engine speed constantly fluctuates, it is difficult to mechanically suck high-temperature combustion exhaust gas mechanically. It is doubtful.

As another prior art, a device that provides a tapered cylinder-shaped acceleration cylinder and a cylindrical cover cylinder positioned on the outer side thereof, and a spiral member inside the acceleration cylinder to rotate exhaust gas inside the acceleration cylinder. Has been proposed (see Patent Document 1).
However, in the related art (Patent Document 1), since the area of the opening formed in the acceleration cylinder is large, a large amount of exhaust gas flows out from the acceleration cylinder to the region between the acceleration cylinder and the cover cylinder. The exhaust gas flow swirls in the accelerating cylinder, and the force for sucking the exhaust gas from the internal combustion engine side by the swirl flow is small, making it difficult to improve the combustion efficiency and fuel consumption of the internal combustion engine.

JP 2011-74774 A

The present invention has been proposed in view of the above-described problems of the prior art, and with a simple structure, a high-temperature gas such as an exhaust gas of an internal combustion engine is mechanically and forcibly sucked to improve the combustion efficiency. It aims at provision of the gas forced-suction apparatus which can improve.

The forced gas suction device of the present invention has an inlet part (10) and an outlet part (20) and an intermediate part (30) having a larger diameter (than the inlet part and outlet part), and the intermediate part (30) Is provided with a tapered swirl flow generating cylinder part (40), and a protrusion (421) is formed in the swirl flow generation cylinder part (40) extending inward in the radial direction and extending spirally, A plurality of outlets (411) having a small opening area are formed in the circumferential direction on the inlet side of the swirling flow generating cylinder (40), and an end (43e) on the outlet side of the swirling flow generating cylinder (40) is The gas (for example, engine exhaust gas) that communicates with the inside of the outlet portion (20) and flows out from the swirling flow generating cylinder portion (40) toward the outlet portion (20) forms a swirling flow, and the swirling flow Between the outlet portion side end portion (43e) of the swirling flow generating cylinder portion (40) and the inlet portion side end portion (21e) of the outlet portion (20). Is characterized in that negative pressure is generated between (E).

According to the present invention having the above-described configuration, the swirl flow generating cylinder part (the protrusion (421) projecting inward in the radial direction formed in the swirl flow generation cylinder part (40) and extending in a spiral shape ( 40) The gas flowing into the inside (for example, exhaust gas of the internal combustion engine) forms a swirling flow and flows out into the outlet portion (20). And by the said swirl flow, a negative pressure arises in the space (E) between the exit part side end part (43e) of a swirl flow generation cylinder part (40), and the entrance part side end part (21e) of an exit part (20). .
Due to this negative pressure, the gas (for example, exhaust gas) existing in the region between the swirl flow generating cylinder (40) and the inner wall surface of the intermediate part (30) is forcibly sucked from the engine (E) side.
And according to this invention, a complicated mechanical component is not required but it can also be easily mounted | worn with the exhaust system (for example, exhaust system of a motor vehicle) of the existing internal combustion engine.

Here, a plurality of outlets (411) having a small opening area are formed in the circumferential direction on the inlet part side of the swirling flow generating cylinder part (40), and the inlet part (41) is formed by the outlets (411). Communicates with the region between the swirling flow generating cylinder (40) and the inner wall surface of the intermediate section (30), but the opening area of the plurality of outlets (411) is small, so that the swirling flow generating cylinder (40) A sufficient amount of gas flows through the inside. Therefore, the flow rate of the swirling flow generated in the swirling flow generating cylinder (40) is also sufficient, and the outlet side end (43e) of the swirling flow generating cylinder (40) and the inlet side end of the outlet (20). In the space (E) between (21e), for example, a negative pressure sufficient to forcibly suck the exhaust gas of an internal combustion engine such as the engine (E) is generated.
With such negative pressure, gas (for example, combustion exhaust gas from the engine) is forcibly sucked to the exhaust side. If the gas that is forcibly sucked is, for example, combustion exhaust gas from the engine, the engine pressure can be lowered to improve the combustion efficiency.

Further, according to the present invention, the negative pressure is generated by the swirling flow generated in the swirling flow generating cylinder portion (40) and the combustion exhaust gas is forcibly sucked downstream, so that in the gas forced suction device (100) The exhaust resistance is reduced, and the output reduction of the internal combustion engine can be suppressed. As a result, fuel consumption is also improved.
That is, according to the present invention, the combustion exhaust gas is mechanically forcibly sucked from the engine (E) side with the above-described simple configuration without a complicated control system, thereby improving the combustion efficiency and reducing the output of the internal combustion engine. Can be suppressed and fuel consumption can be improved.

And according to the present invention, even when the accelerator is frequently opened and closed like an automobile, the swirl flow is generated in the swirl flow generating cylinder (40) regardless of the rotational speed of the engine (E), Negative pressure can be generated in the space (E) between the outlet side end (43e) of the swirl flow generating cylinder (40) and the inlet side end (21e) of the outlet (20). Therefore, when applied to the exhaust system of an automobile, even if the accelerator is frequently opened and closed, exhaust gas is forcibly sucked from the engine (E) side (upstream side of the exhaust system) to improve combustion efficiency. In addition, the output reduction of the internal combustion engine can be suppressed and the fuel consumption can be improved.
Furthermore, according to the present invention that can improve the combustion efficiency of the engine and improve the fuel efficiency, it is possible to contribute to the reduction of CO ₂ .

It is a perspective view which shows the gas forced suction apparatus which concerns on embodiment of this invention. It is a side view of the gas forced suction device concerning an embodiment. FIG. 3 is a cross-sectional view taken along the line XX in FIG. 2. It is A arrow line view in FIG. FIG. 3 is a view taken in the direction of arrow B in FIG. 2. It is a perspective view which cut | disconnects and shows a part of gas forced suction apparatus which concerns on embodiment. It is a perspective view different from FIG. 6 which cuts and shows a part of gas forced suction apparatus which concerns on embodiment. It is explanatory drawing which shows the flow of the exhaust gas in the gas forced suction apparatus which concerns on embodiment. It is the block diagram which showed the exhaust system of the gasoline engine. It is the block diagram which showed the exhaust system of the diesel engine.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, in the illustrated embodiment, the case where the forced gas suction device of the present invention is applied to the exhaust system of the engine is shown.
The gas forced suction device according to the embodiment of the present invention is generally indicated by reference numeral 100 in FIGS.
The exhaust system of the gasoline engine Eg shown in FIG. 9 is provided with an exhaust gas circulation device Er, an exhaust gas catalyst device C, and a silencer M, and a downstream end portion (right end portion in FIG. 9) of the exhaust system. The gas forced suction device 100 is disposed at the bottom. The exhaust system of the diesel engine Ed shown in FIG. 10 is provided with an exhaust gas circulation device Er, a particulate combustion device (DPF device) Dp, and a silencer M, and is disposed at the downstream end (right end in FIG. 10). A gas forced suction device 100 is arranged. However, the position where the gas forced suction device 100 is interposed is not limited to the downstream end portion of the exhaust system shown in FIGS. 9 and 10, and can be interposed anywhere within the exhaust system. Is possible. And it can attach easily to the existing exhaust pipe (exhaust system).

As shown in FIGS. 1 and 2, the forced gas suction device 100 has an inlet portion 10, an outlet portion 20, and an intermediate portion 30.
In FIG. 2, the inlet portion 10 is formed of a cylindrical member, and four nuts N are welded at equal intervals in the circumferential direction on the same cross section on the outer periphery of the cylindrical member. The nut N is provided to connect the gas forced suction device 100 to an exhaust pipe (not shown) of an existing automobile. When connecting the gas forced suction device 100 to the exhaust pipe of an existing automobile, the end of the exhaust pipe is fitted to the inner periphery of the inlet 10 of the gas forced suction device 100, and the inner peripheral surface side of the exhaust pipe Then, a bolt (not shown) is penetrated, and the penetrated bolt is screwed into the nut N.
The outlet portion 20 is constituted by a tapered cylindrical member, and the diameter of the tapered cylindrical member gradually increases toward the downstream side (right side in FIG. 2). The outlet portion 20 is integrally joined to the rear end (right end in FIG. 2) of the intermediate portion 30.

2 and 3, the intermediate portion 30 has a large diameter portion 31, a tapered portion 32, and a small diameter portion 33, and the large diameter portion 31, the tapered portion 32, and the small diameter portion 33 are continuously and integrally connected. ing.
The diameter of the small diameter portion 33 is equal to the diameter of the upstream end portion (left end portion in FIGS. 2 and 3) of the outlet portion 20. The upstream end of the intermediate portion 30 (the upstream end of the large-diameter portion 31: the left end in FIG. 3) is joined to the inlet portion 10 by the end plate 34. Note that an opening is formed in the radially inner region of the end plate 34 (see FIG. 4).

A swirl flow generating cylinder portion 40 is provided inside the intermediate portion 30.
The swirl flow generating cylinder portion 40 has a large diameter portion 41, a first taper portion 42, and a second taper portion 43. The large diameter portion 41, the first taper portion 42, and the second taper portion 43 are They are arranged in order from the inlet 10 to the outlet 20.
The large-diameter portion 41 is entirely cylindrical, and a plurality of through holes 411 are formed at equal intervals in the circumferential direction on the same cross section of the cylinder.
The first taper portion 42 has a taper whose diameter decreases toward the downstream side (right side in FIG. 3). On the other hand, the second taper portion 43 has a taper whose diameter increases toward the downstream side (right side in FIG. 3).
Here, when the taper or the inclination angle in the first taper portion 42 is inappropriate, the swirling flow is separated from the outer peripheral surface of the swirling flow generating cylinder portion 40, and the effect of the swirling flow is reduced. For this reason, it is desirable to appropriately set the taper or the inclination angle in the first taper portion 42.

The diameter of the large diameter portion 41 in the swirl flow generating cylinder portion 40 is set smaller than the diameter of the large diameter portion 31 in the intermediate portion 30 but larger than the diameter of the inlet portion 10.
In addition, it is also possible to replace the 2nd taper part 43 with a straight pipe | tube.
In FIG. 3, the small diameter portion 33 in the intermediate portion 30 and the second tapered portion 43 in the swirling flow generating cylinder portion 40 are a plurality of (three in the illustrated example) support plates 50 that are equally arranged in the circumferential direction. (See FIG. 5).

The upstream end (the upstream end of the large-diameter portion 41: the left end in FIG. 3) of the swirling flow generating cylinder portion 40 is in contact with the end plate 34, and is fixed to the end plate 34 by known means (for example, welding). Yes.
A spiral plate-like member 421 (blade) having a predetermined width is provided on the inner peripheral surface of the first taper portion 42 in the swirling flow generating cylinder portion 40 over the entire length in the axial direction (left-right direction in FIG. 3). Is fixed.
4 and 6, reference numeral 341 denotes rectangular protrusions that are formed at a plurality of locations (four locations in the illustrated example) at the inner peripheral side of the end plate 34 and project radially inward. Yes. The forced gas suction device 100 according to the illustrated embodiment can be attached to an existing engine exhaust pipe, but there are various sizes of the existing engine exhaust pipe. By providing the protrusion 341 that protrudes inward in the radial direction, even when the pipe diameter of the existing engine exhaust pipe (not shown) is small, the existing exhaust pipe is arranged radially inward of the inlet portion 10, The end of the existing exhaust pipe is brought into contact with the protrusion 341 (the protrusion 341 functions as a stopper), and a bolt (not shown) is screwed in from the radially outer side toward the existing exhaust pipe instead of the nut N. The gas forced suction device 100 can be attached.

With reference to FIG. 8, the aspect in which exhaust gas flows through the gas forced suction device 100 will be described. In FIG. 8, the nut N and the support plate 50 are omitted for simplification of illustration.
In FIG. 8, the exhaust gas flowing into the inlet 10 from an exhaust pipe (not shown) is indicated by an arrow F1 indicated by a dotted line. Most of the inflowing exhaust gas F1 flows in the swirl flow generating cylinder portion 40, and in the meantime, the spiral blade 421 provided in the first taper portion 42 becomes a swirl flow F2 having a high flow velocity.

On the other hand, a part of the exhaust gas F1 flowing into the inlet portion 10 from an exhaust pipe (not shown) is formed in the annular space ER formed by the inner periphery of the intermediate portion 30 and the outer periphery of the swirling flow generating cylinder portion 40 from the plurality of through holes 411. (Arrow F3).
The flow F3 flowing into the annular space ER travels in the annular space ER as indicated by an arrow F4, and is between the outlet side end 43e of the second tapered portion 43 and the inlet side end 21e of the outlet 20. Is discharged to the outlet 20 through the space E (arrow F4x).

Here, due to the swirl flow F2 generated in the swirl flow generating cylinder part 40, the outlet part side end part 43e of the second taper part 43 of the swirl flow generation cylinder part 40 and the inlet part side end part 21e of the outlet part 20 are A negative pressure is generated in the space E. Due to the negative pressure generated in the space E, the exhaust gases F3 and F4 are forcibly sucked to the space E side through the plurality of through holes 411 and the annular space ER in the swirling flow generating cylinder portion 40.
Since the area of the outlet 43e of the second tapered portion 43 in the swirling flow generating cylinder portion 40 is smaller than the area of the front end of the swirling flow generating cylinder portion 40 (front end of the large diameter portion 41), the flow velocity of the swirling flow F2 is It becomes faster and the negative pressure E in the space E becomes stronger.
Due to the action of strong negative pressure at the position E, the exhaust gas flow in the annular space ER indicated by the arrows F3, F4, and F4x flows toward the outlet 20 with a high flow rate.

As described above, according to the gas forced suction device 100 shown in the figure, the exhaust gas flowing into the swirling flow generating cylinder portion 40 is swirled by the spiral blade 421 formed in the swirling flow generating cylinder portion 40. And flows out into the outlet portion 20. A strong negative pressure is generated in the space E by the swirl flow F2, and the exhaust gas existing in the annular space ER is strongly sucked. As a result, the combustion pressure can be improved by lowering the pressure of the engine.
Further, since the combustion exhaust gas is forcibly sucked downstream, the exhaust resistance in the gas forced suction device (100) is reduced, and the output reduction of the internal combustion engine can be suppressed. As a result, fuel consumption is also improved.

A plurality of outlets 411 having a small opening area are formed in the circumferential direction on the inlet portion side of the swirling flow generating cylinder portion 40, and the inlet portion 41 is intermediate between the swirling flow generating cylinder portion 40 and the outlet 411. Since it communicates with the annular region ER between the inner wall surfaces of the portion 30, when a part of the exhaust gas that has flowed into the inlet portion 10 flows into the region ER, a noise reduction (noise reduction) effect is obtained by expansion (expansion) of the exhaust gas. I can expect it.
Furthermore, according to the illustrated embodiment, the exhaust gas is forcibly sucked mechanically with the above-described simple configuration without a complicated control system, and the output reduction of the internal combustion engine can be suppressed and the fuel consumption can be improved. Therefore, for example, an existing exhaust system such as an exhaust pipe of an automobile can be easily interposed or attached to improve the combustion efficiency and fuel consumption of the existing engine.

Here, a plurality of outlets 411 having a small opening area are formed in the upstream region of the swirl flow generating cylinder portion 40, and the inlet portion 41 and the annular region ER are communicated with each other by the outlet 411. Since the opening area of the outlet 411 thus formed is small, a sufficient flow rate of exhaust gas flows through the swirl flow generating cylinder portion 40.
Therefore, the flow rate of the swirling flow F2 generated in the swirling flow generating cylinder 40 is also sufficient. And since the area of the exit 43e of the 2nd taper part 43 in the swirl flow generation cylinder part 40 is small compared with the area of the upstream end (front end of the large diameter part 41) of the swirl flow generation cylinder part 40, the swirl flow F2 In the space E, a negative pressure sufficient to forcibly suck the exhaust gas in the annular region ER is generated.

In addition, according to the illustrated embodiment, even when the accelerator is frequently opened and closed as in an automobile, the swirl flow is generated in the swirl flow generating cylinder 40 regardless of the rotational speed of the engine E, A negative pressure can be generated in the space E. Therefore, even when the accelerator is frequently opened and closed (like an automobile), exhaust gas is forcibly sucked to improve combustion efficiency, suppress output reduction of the internal combustion engine, and improve fuel efficiency. I can do it.

It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.
For example, although the illustrated embodiment describes only a case where exhaust gas is forcibly sucked by being interposed in an exhaust system of an engine which is an internal combustion engine, the gas forced suction device of the present invention is an exhaust of a restaurant or the like, for example. The present invention can also be applied to forcibly sucking a gas that is interposed in the duct and flows in the exhaust duct.

DESCRIPTION OF SYMBOLS 10 ... Inlet part 20 ... Outlet part 30 ... Middle part 31 ... Large diameter part 32 ... Tapered part 33 ... Small diameter part 34 ... End plate 40 ... Swirling flow generation cylinder Part 41... Large diameter part 42... First taper part 42
43 ... 2nd taper part 50 ... support plate 100 ... forced gas suction device 411 ... through-hole 421 ... spiral plate member (blade)

Claims (1)

It has an inlet and outlet, and a large-diameter intermediate part. A tapered swirl flow generating cylinder is provided in the intermediate part, and the swirl flow generating cylinder protrudes radially inward and spirals. A plurality of outlets having a small cross-sectional area are formed in the circumferential direction on the inlet portion side of the swirling flow generating cylinder portion, and the end portion on the outlet portion side of the swirling flow generating cylinder portion is inward of the outlet portion. The gas flowing out from the swirl flow generating cylinder part to the outlet part side forms a swirl flow, and the swirl flow generates an end part on the outlet part side of the swirl flow generation cylinder part and an end part on the inlet part side of the outlet part. A gas forced suction device characterized in that a negative pressure is generated in a space between the two.

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