CN102187070A - Exhaust purifying device for internal combustion engine - Google Patents

Abstract

An exhaust purifying device for an internal combustion engine is provided with an exhaust manifold (19), a catalytic converter (21) provided at an angle to the exhaust manifold (19) at a position downstream of the exhaust manifold (19) and incorporating a NOx occluding and reducing catalyst (20), and a reducing agent supply device (22) for supplying a reducing agent to exhaust gas passing through the inside of the exhaust manifold. A projection (35) projecting outward radially of a casing (30) of the catalytic converter is provided to the inner wall surface of the casing (30) at a position facing the exit of the exhaust manifold. That portion of the wall surface which defines the projection is formed in such a manner that the component, in the direction of the axis of the casing, of the speed of the flow of at least a portion of the exhaust gas flowing into the projection is oriented by the projection in the direction opposite the direction toward the NOx occluding and reducing catalyst. The exhaust purifying device can minimize an increase in loss of pressure of the exhaust gas and can disperse the reducing agent, which is supplied from the reducing agent supply device, into the exhaust gas.

Description

The Exhaust gas purifying device of internal-combustion engine

Technical field

The present invention relates to the Exhaust gas purifying device of internal-combustion engine.

Background technique

From the waste gas that internal-combustion engine is discharged, contain nitrogen oxide (NOx) and coal equigranular material, for these compositions are purified, all measures are arranged.As the example in this formation, can enumerate a kind of Exhaust gas purifying device, its in the I. C. engine exhaust passage, be provided with catalyzer with the effect of NOx absorbing and reducing or particulate filter (below, be called " NOx storage and reduction catalyst "), and be provided with the reducer feeding device of in the internal-combustion engine exhaust passage, supplying with reducing agent in the exhaust-gas upstream side of this catalyzer.

In this Exhaust gas purifying device, when the NOx of NOx storage and reduction catalyst storage volume more for a long time, in the internal-combustion engine exhaust passage, supply with reducing agent from reducer feeding device, and make NOx that the NOx reduction is purified.

Herein, from reducer feeding device supply reducing agent the time, for all carrying out best disengaging, the reduction of NOx in the NOx storage and reduction catalyst in the NOx storage and reduction catalyst, the reducing agent of supply is flow in the NOx storage and reduction catalyst equably.Therefore, the reducing agent that has proposed to make supply is along the various technology of diffusion equably in the waste gas that flows in the I. C. engine exhaust passage.

For example, in patent documentation 1 disclosed Exhaust gas purifying device, be provided with the restriction of the sectional area that dwindles blast air in the outlet pipe between reducer feeding device and exhaust emission control catalyst.In this Exhaust gas purifying device, utilize restriction to quicken exhaust-gas flow, thereby in waste gas, produce turbulent flow, make the reducing agent diffusion of supplying with from reducer feeding device thus.

In addition, in patent documentation 2 disclosed Exhaust gas purifying devices, in the catalytic cleaner of exhaust emission control catalyst upstream side, be provided with exhaust ingress pipe and the partition wall that possesses a plurality of perforation that front end is covered lid and has a plurality of perforation.And then, in patent documentation 3 disclosed Exhaust gas purifying devices, be provided with a plurality of diffuser plates of configuration that stagger mutually in the outlet pipe between reducer feeding device and exhaust emission control catalyst.These Exhaust gas purifying devices all are to utilize exhaust ingress pipe and partition wall or diffuser plate to make to produce turbulent flow in the waste gas, and the reducing agent of supplying with from reducer feeding device is spread waste gas.

Patent documentation 1: Japanese Patent Application Laid-Open 2002-213233 communique

Patent documentation 2: Japanese Patent Application Laid-Open 2003-184544 communique

Patent documentation 3: Japanese Patent Application Laid-Open 2005-325747 communique

Yet restriction, exhaust ingress pipe and the partition wall, the diffuser plate that are adopted in above-mentioned patent documentation 1～3 described Exhaust gas purifying device all are to make generation turbulent flow in the waste gas by hindering exhaust-gas flow.Therefore, though reducing agent is spread in waste gas, cause the pressure loss of waste gas to increase by these constituting components are set in the I. C. engine exhaust passage thereupon.When the pressure loss of waste gas increases in this wise, cause waste gas to be difficult for flowing out from the firing chamber of internal-combustion engine, its result may cause internal-combustion engine output reduction and oil consumption rate variation etc.

Summary of the invention

For this reason, the object of the present invention is to provide a kind of Exhaust gas purifying device of internal-combustion engine, it can suppress when the exhaust gas pressure loss increases the reducing agent of supplying with from reducer feeding device to be spread waste gas.

As the device that is used to solve above-mentioned problem, the invention provides the control gear of the internal-combustion engine of each technological scheme record.

The Exhaust gas purifying device of the internal-combustion engine of the present invention's the 1st scheme possesses: from the upstream side exhaust passage that the exhaust flow of internal-combustion engine discharge is crossed, be configured in the downstream side of this upstream side exhaust passage and with respect to the exhaust passage, downstream side of upstream side exhaust passage angulation, in the waste gas of process in the upstream side exhaust passage, supply with the reducing agent feed unit of reducing agent, and be arranged on exhaust gas purification unit in the exhaust passage, downstream side, this Exhaust gas purifying device is characterised in that, exporting opposed part setting with the upstream side exhaust passage and flow to deflector at the internal face of delimiting the exhaust passage, downstream side, this flows to the upstream side that deflector is positioned at the exhaust gas purification unit, and form with flow into velocity component on exhaust passage, the downstream side axial direction of at least a portion air-flow of this waste gas that flows to deflector be orientated with towards the side of exhaust gas purification unit in the opposite direction.

According to this programme, because of the effect that flows to deflector that on internal face, forms be oriented with towards the side of exhaust gas purification unit in the opposite direction waste gas and other waste gas bump.By this collision, in waste gas, produce turbulent flow, and promote mixing of reducing agent and waste gas.In addition,, therefore the constituting component with the exhaust flow throttling is not set in fact, can increases the pressure loss of waste gas hardly owing to flow to the direction that deflector just changes exhaust flow.

Thereby,, can promote mixing of reducing agent and waste gas by in waste gas, producing turbulent flow according to this programme.In addition, constituting component with the exhaust flow throttling is not set in fact.Therefore, can under the situation that suppresses exhaust gas pressure loss increase, the reducing agent of supplying with from reducer feeding device be spread waste gas.

The present invention's the 2nd scheme is, has in the zone of close exhaust gas purification unit one side of delimiting the above-mentioned wall that flows to deflector towards the radial outside of exhaust passage, downstream side and towards the part that tilts in the opposite direction with side towards the exhaust gas purification unit.

The Exhaust gas purifying device of the internal-combustion engine of the present invention's the 3rd scheme possesses: from the upstream side exhaust passage that the exhaust flow of internal-combustion engine discharge is crossed, be configured in the downstream side of this upstream side exhaust passage and with respect to the exhaust passage, downstream side of upstream side exhaust passage angulation, in the waste gas of process in the upstream side exhaust passage, supply with the reducing agent feed unit of reducing agent, and be arranged on exhaust gas purification unit in the exhaust passage, downstream side, this Exhaust gas purifying device is characterised in that, exporting opposed part with the upstream side exhaust passage and be provided with and flow to deflector at the internal face of delimiting the exhaust passage, downstream side, this flows to the upstream side that deflector is positioned at the exhaust gas purification unit, this wall that flows to deflector forms: with this flow to deflector wall part touching and make at least a portion of the waste gas that velocity component towards the direction of exhaust gas purification unit has increased and the other parts touching of this wall that flows to deflector, and make the velocity component reduction on this direction of this waste gas.

According to this programme, because of the effect of the part of the wall that flows to deflector makes the other parts touching of velocity component towards the direction of exhaust gas purification unit waste gas that has increased and the wall that flows to deflector, the velocity component towards the direction of exhaust gas purification unit of this waste gas is reduced.Like this, by colliding the velocity component that reduces towards the direction of exhaust gas purification unit, and in waste gas, produce turbulent flow, and promote mixing of reducing agent and waste gas with the other parts of above-mentioned wall.In addition,, therefore the constituting component with the exhaust flow throttling is not set in fact, can increases the pressure loss of waste gas hardly owing to flow to the direction that deflector just changes exhaust flow.

Thereby,, can promote mixing of reducing agent and waste gas by in waste gas, producing turbulent flow according to this programme.In addition, constituting component with the exhaust flow throttling is not set in fact.Therefore, can suppress when the exhaust gas pressure loss increases the reducing agent of supplying with from reducer feeding device to be spread waste gas.

The present invention's the 4th scheme is to have in the above-mentioned zone away from Exhaust gas purifying device one side that flows to the wall of deflector of delimitation towards the radial outside of exhaust passage, downstream side and the part that tilts to the direction towards the exhaust gas purification unit.

The present invention's the 5th scheme is, the above-mentioned deflector that flows to possesses protuberance, and this protuberance is that the internal face self of delimiting the exhaust passage, downstream side is outstanding and form towards the radial outside of exhaust passage, downstream side.

According to this programme, state even the reducing agent of supplying with from the reducing agent feed unit is not fully gasified with drop flows out from the upstream side exhaust passage, also can in protuberance, accept this drop and make it evaporation, therefore can suppress reducing agent and flow into exhaust gas purification unit and situation generation attached to it with the drop state.

The present invention's the 6th scheme is, the cross section of above-mentioned protuberance on the circumferencial direction of exhaust passage, downstream side is half elliptic roughly.

The present invention's the 7th scheme is, towards the inlet area of the above-mentioned protuberance of exhaust passage, the above-mentioned downstream side sectional area greater than the upstream side exhaust passage.

The present invention's the 8th scheme is that the height of above-mentioned protuberance on the axial direction of exhaust passage, downstream side is greater than the diameter of upstream side exhaust passage.

The present invention's the 9th scheme is that above-mentioned protuberance extends along exhaust passage, above-mentioned downstream side circumferencial direction.

The present invention's the 10th scheme is, the degree of depth that above-mentioned protuberance directly makes progress in the exhaust passage, downstream side is along with away from exporting opposed zone with above-mentioned upstream side exhaust passage and reducing.

The present invention's the 11st scheme is that the peripheral shape of above-mentioned protuberance becomes roughly half elliptic.

The present invention's the 12nd scheme is that above-mentioned protuberance is inclined to following state: from exporting opposed zone with above-mentioned upstream side exhaust passage, along with away from exhaust passage, downstream side circumferencial direction, this protuberance approaches the exhaust gas purification cell side more.

The present invention's the 13rd scheme is, extend in the mode that its central axis is passed in the protuberance above-mentioned upstream side exhaust passage.

The present invention's the 14th scheme is that near above-mentioned upstream side exhaust passage central axis with respect to the exhaust passage, downstream side its outlet extends obliquely.

The present invention's the 15th scheme is that near above-mentioned upstream side exhaust passage central axis with respect to the exhaust passage, downstream side its outlet vertically extends.

The present invention's the 16th scheme is, above-mentioned upstream side exhaust passage enters in the exhaust passage, downstream side and extends.

The present invention's the 17th scheme is that the outlet of above-mentioned upstream side exhaust passage enters in the above-mentioned protuberance.

The present invention's the 18th scheme is, the above-mentioned deflector that flows to possesses protuberance, this protuberance is that the internal face self of delimiting the exhaust passage, downstream side is given prominence to and formed towards the radial outside of exhaust passage, downstream side, and the cross section of this protuberance on the circumferencial direction of exhaust passage, downstream side is essentially rectangular.

The present invention's the 19th scheme is, the above-mentioned deflector that flows to possesses protuberance, and this protuberance is outstanding towards the radially inner side of exhaust passage, downstream side from the internal face of delimiting the exhaust passage, downstream side.

The present invention's the 20th scheme is, above-mentioned upstream side exhaust passage delimited by discharge manifold or with the direct-connected outlet pipe of discharge manifold, and exhaust passage, above-mentioned downstream side is the tapered portion that the upstream portion at the catalytic cleaner of taking in the exhaust gas purification unit is provided with.

Below, by the record of accompanying drawing and preferred implementation of the present invention, can further fully understand the present invention.

Description of drawings

Fig. 1 is the schematic representation that is equipped with the whole internal-combustion engine of Exhaust gas purifying device of the present invention.

Fig. 2 A and Fig. 2 B are the enlarged views of the catalytic cleaner of first mode of execution shown in Figure 1.

Fig. 3 A and Fig. 3 B are the enlarged views of the catalytic cleaner of second mode of execution.

Fig. 4 A and Fig. 4 B are the enlarged views of the catalytic cleaner of the 3rd mode of execution.

Fig. 5 A and Fig. 5 B are the enlarged views of the catalytic cleaner of the 4th mode of execution.

Fig. 6 A and Fig. 6 B are the enlarged views of the catalytic cleaner of the 5th mode of execution.

Fig. 7 A and Fig. 7 B are the enlarged views of the catalytic cleaner of the 6th mode of execution.

Fig. 8 A and Fig. 8 B are the enlarged views of the catalytic cleaner of the 7th mode of execution.

Fig. 9 A and Fig. 9 B are the enlarged views of the catalytic cleaner of the 8th mode of execution.

Embodiment

Below, the mode of execution that present invention will be described in detail with reference to the accompanying.In the following description, for the additional identical reference character of same constituting component.

Fig. 1 is the schematic representation that is equipped with the whole internal-combustion engine of Exhaust gas purifying device of the present invention.With reference to Fig. 1, the 1st, internal combustion engine main body, the 2nd, cylinder block, the 3rd, in cylinder block 2, come and go the piston that moves, the 4th, be fixed on the cylinder head on the cylinder block 2, the 5th, the firing chamber that between piston 3 and cylinder head 4, forms, the 6th, intake valve, the 7th, suction port, the 8th, exhaust valve, the 9th, relief opening.As shown in Figure 1, dispose spark plug 10, dispose Fuelinjection nozzle 11 at cylinder head 4 internal face peripheries at the internal face central part of cylinder head 4.In addition, form on the end face of piston 3 extend to below the Fuelinjection nozzle 11 spark plug 10 below inner chamber 12.

The suction port 7 of each cylinder is connected with surge tank 14 via each corresponding air intake branch 13, and surge tank 14 is connected with air filter (not shown) via admission line 15 and Air flow meter 16.In admission line 15, dispose the throttle valve 18 that is driven by stepper motor 17.On the other hand, the relief opening 9 of each cylinder is connected with discharge manifold 19, and this discharge manifold 19 is connected with the catalytic cleaner 21 of built-in NOx storage and reduction catalyst 20.And, in the present embodiment, built-in NOx storage and reduction catalyst 20 in catalytic cleaner 21, but so long as need to supply with the device of reducing agent for purifying exhaust air, then can be built-in any exhaust gas purification unit.As this exhaust gas purification unit, can enumerate oxidation catalyst, three-way catalyst, particulate filter etc.

Be provided with the reducer feeding device 22 of in the waste gas that in discharge manifold 19, flows, supplying with reducing agent on the discharge manifold 19.In addition, discharge manifold 19 and surge tank 14 interconnect via EGR gas (hereinafter referred to as EGR gas) conduit 26, and dispose EGR gas control valve 27 in this EGR gas conduit 26.

Fig. 2 A and Fig. 2 B are the enlarged views of catalytic cleaner 21 shown in Figure 1.Fig. 2 A is the sectional side view that the line A from Fig. 2 B sees, Fig. 2 B is the cutaway top view that the line B from Fig. 2 A sees.Shown in Fig. 2 A and Fig. 2 B, catalytic cleaner 21 possesses housing 30, takes in NOx storage and reduction catalyst 20 in this housing 30.The tapered portion 32 that housing 30 has the catalyzer container 31 of taking in NOx storage and reduction catalyst 20 and is arranged on catalyzer container 31 upstream sides.The catalyzer container 31 of these housings 30 and tapered portion 32 all delimited the exhaust passage (exhaust passage, downstream side) that makes exhaust-gas flow.

In the present embodiment, NOx storage and reduction catalyst 20 and housing 30 (catalyzer container 31 and tapered portion 32) arranged coaxial, their axis L generally perpendicularly extends.Thereby, also generally perpendicularly extend by the exhaust passage that housing 30 (that is, catalyzer container 31 and tapered portion 32) delimited.In the following description, the exhaust-gas upstream side of NOx storage and reduction catalyst 20 as the top, and is described the exhaust downstream side as the below.In addition, the axis L of NOx storage and reduction catalyst 20 and housing 30 not necessarily will generally perpendicularly extend, and also can be configured to extend along any directions such as levels.In addition, NOx storage and reduction catalyst 20 and housing 30 are also not necessarily wanted arranged coaxial.

Shown in Fig. 2 A and Fig. 2 B, discharge manifold 19 is connected with housing 30.Specifically, discharge manifold 19 connects the wall of tapered portion 32 and extends at the upper section of the tapered portion 32 of housing 30.Thereby discharge manifold 19 enters in the tapered portion 32.Shown in Fig. 2 A and Fig. 2 B, discharge manifold 19 tilts with respect to axis L at the position of the wall that connects tapered portion 32.In addition, discharge manifold 19 is crooked in tapered portion 32, and makes near the part outlet of discharge manifold 19 (below, be called " near the part menifold outlet ") 19a with respect to axis L vertical extent, promptly with respect to the wall vertical extent of tapered portion 32.Shown in Fig. 2 A and Fig. 2 B, the outlet of discharge manifold 19 is faced mutually with the part of the internal face of tapered portion 32.The discharge manifold 19 that constitutes like this delimited the exhaust passage (upstream side exhaust passage) that makes from the exhaust-gas flow of internal combustion engine main body 1 discharge.

Part at the internal face of the tapered portion of facing mutually with the outlet of discharge manifold 19 32 is provided with the radially outstanding protuberance 35 towards housing 30.Shown in the side view cutaway drawing of Fig. 2 A, the upside wall 35a of protuberance 35 tilts downwards towards the radial outside of housing 30, and the downside wall 35b of protuberance 35 tilts upward towards the radial outside of housing 30.Particularly, in the present embodiment, the cross section of the protuberance 35 on housing 30 circumferencial directions becomes roughly half elliptic.

In addition, shown in Fig. 2 B, this protuberance 35 is from extending towards the circumferencial direction both sides of housing 30 with the zone that the outlet of discharge manifold 19 is faced mutually.If will be never the internal face of tapered portion 32 during protuberance 35 play the depth D that is made as protuberance 35 up to the length till the part of the radially the most outstanding protuberance of housing 30, then the depth D of protuberance 35 from the zone faced mutually with the outlet of discharge manifold 19 along with to the circumferencial direction of housing 30 away from, this zone shoals gradually.That is, the depth D of protuberance 35 is the darkest in the zone of facing mutually with the outlet of discharge manifold 19, and rises from here along with to the circumferencial direction expansion and shoal gradually.Especially, shown in Fig. 2 B, in the present embodiment, the periphery that forms protuberance 35 roughly is half elliptic.In addition, in the present embodiment, protuberance 35 partly extends more than crossing over half circumference on the circumferencial direction of housing 30.

Waste gas flowing in discharge manifold 19 that constitutes like this and housing 30 below is described.Arrow among Fig. 2 A and Fig. 2 B is represented flowing of waste gas.In discharge manifold 19, flowing has the waste gas of discharging and supplied with by reducer feeding device 22 reducing agent from internal combustion engine main body 1.Thereby, in the waste gas that in the discharge manifold 19 of Fig. 2 A and Fig. 2 B, flows, include as yet not and the well-mixed reducing agent of waste gas.

The waste gas that comprises reducing agent that flows in discharge manifold 19 flow in the protuberance 35 after the outlet of discharge manifold 19 is flowed out.The downside wall 35b collision of near waste gas that the bottom of part 19a is flow through the menifold outlet and protuberance 35.By this collision, the flow direction that makes waste gas is towards the top.On the other hand, the upside wall 35a collision of near waste gas that the top of part 19a is flow through the menifold outlet and protuberance 35.By this collision, the flow direction that makes waste gas is towards the below.

If like this with the flow direction of the waste gas of the downside wall 35b of protuberance 35 collision towards the top, and with the flow direction of the waste gas of the upside wall 35a collision of protuberance 35 towards the below, then these waste gas collision mutually.Like this, collide mutually by two strands of waste gas waste gas is stirred, thereby promote mixing of reducing agent contained in the waste gas and waste gas.

In addition, make the waste gas of its flow direction, even not with flow direction also can collide with the upside wall 35a of protuberance 35 towards the waste gas collision of below with the upside wall 35a collision of protuberance 35 towards the top with the downside wall 35b collision of protuberance 35.By the collision of this and upside wall 35a, the velocity component towards the top of waste gas is reduced, and waste gas is stirred, promote mixing of reducing agent contained in the waste gas and waste gas.

Equally, make the waste gas of its flow direction, even not with flow direction also can collide with the downside wall 35b of protuberance 35 towards the waste gas collision of below with the downside wall 35b collision of protuberance 35 towards the below with the upside wall 35a collision of protuberance 35.By the collision of this and upside wall 35b, the velocity component towards the below of waste gas is reduced, and waste gas is stirred, promote that contained reducing agent mixes with waste gas in the waste gas.

Flow into that waste gas in the protuberance 35 changes above-below direction with the wall collision of protuberance 35 mobile towards, and shown in arrow among Fig. 2 B, waste gas is along the wall of protuberance 35 circumferencial direction two side flow towards housing 30.Thus, make the waste gas diffusion equably in whole housing 30 that flow in the protuberance 35.Therefore, the waste gas that is mixed with reducing agent equably flow in the NOx storage and reduction catalyst 20 equably.Thereby, in NOx storage and reduction catalyst 20, whole NOx storage and reduction catalysts 20 are reacted equably with reducing agent, for example can be stored in the purification of the NOx in the NOx storage and reduction catalyst 20 most effectively.

At this,, during mixing in promoting waste gas between contained reducing agent and the waste gas, be not provided for dwindling the parts of waste gas flow path area according to the discharge manifold 19 and the housing 30 of present embodiment.Therefore, even waste gas flows, also hardly the pressure loss can take place in the discharge manifold 19 of above-mentioned formation and housing 30.Thereby, according to the embodiment of the present invention, can almost not have under the situation of exhaust gas pressure loss, promote mixing of reducing agent contained in the waste gas and waste gas.

In addition, the reducing agent in the waste gas that flows through in discharge manifold 19 does not fully gasify in the outlet port of discharge manifold 19 sometimes, but flows out from discharge manifold 19 with the state of drop.Yet in the discharge manifold 19 and housing 30 of present embodiment, even reducing agent flows out from discharge manifold 19 with the state of drop, its major part also can flow in the protuberance 35.And, because of the waste gas turbulent flow that produces in protuberance 35 makes the drop that flow in the protuberance 35 evaporate easily.Therefore, even under the situation that reducing agent flows out from discharge manifold 19 with the drop state, also can suppress the situation that reducing agent flow into NOx storage and reduction catalyst 20 with the drop state and is attached to NOx storage and reduction catalyst 20.

And in the above-described embodiment, protuberance 35 is from extending roughly the same length in the circumferencial direction both sides with the zone that the outlet of discharge manifold 19 is faced mutually.But protuberance 35 also must extend identical length in the circumferencial direction both sides, also can be that length is on one side extended more longways than another side.

In addition, in the above-described embodiment, protuberance 35 promptly extends on the plane vertical with axis L from extending to circumferencial direction with the zone that the outlet of discharge manifold 19 is faced mutually.But protuberance 35 also can extend obliquely with respect to circumferencial direction, promptly extends with respect to the plane inclination ground vertical with axis L.For example, protuberance 35 also can be inclined to following state: from the zone faced mutually with the outlet of discharge manifold 19 along with along the circumferential direction away from, this protuberance more and more is positioned at downside.

Below, with reference to Fig. 3 A and Fig. 3 B second mode of execution of the present invention is described.Fig. 3 A and Fig. 3 B be second mode of execution catalytic cleaner 21 with Fig. 2 A and the same enlarged view of Fig. 2 B.The formation of the Exhaust gas purifying device of second mode of execution formation with the Exhaust gas purifying device of first mode of execution basically is identical.Wherein, in the Exhaust gas purifying device of first mode of execution, the cross section of the protuberance 35 on housing 30 circumferencial directions is half elliptic roughly, and in the Exhaust gas purifying device of second mode of execution, the cross section of the protuberance 40 on housing 30 circumferencial directions is an essentially rectangular.

As shown in Figure 3A, protuberance 40 has the vertical walls 40a that extends abreast with axis L, is connected the lower horizontal wall 40c that vertically extends with axis L and the upper horizontal wall 40b that vertically extends with axis L is connected with bottom with this vertical walls 40a with the top of this vertical walls 40a.

Below, waste gas flowing in discharge manifold 19 that constitutes like this and housing 30 is described.The waste gas that comprises reducing agent that flows through in discharge manifold 19 flow in the protuberance 40 after the outlet of discharge manifold 19 is flowed out.Because part 19a almost parallel ground extends near the lower horizontal wall 40c of protuberance 40 and the menifold outlet, therefore the waste gas that flows through the bottom of the part 19a of menifold outlet near is difficult to collide with the lower horizontal wall 40c of protuberance 40, but nonetheless, therefore the wherein a part of velocity component that has towards the below of cause still can collide with lower horizontal wall 40c.By this collision, the flow direction that makes waste gas is towards the top, and bumps with the waste gas that flow into from discharge manifold 19 in the protuberance 40.

On the other hand, because the upper horizontal wall 40b of protuberance 40 also extends with near the part 19a almost parallel ground of menifold outlet, therefore the waste gas that flows through the top of the part 19a of menifold outlet near is difficult to collide with the upper horizontal wall 40b of protuberance 40, but nonetheless, therefore the wherein a part of velocity component that has towards the top of cause still can collide with upper horizontal wall 40b.By this collision, the flow direction that makes waste gas is towards the below, and bumps with the waste gas that flow into from discharge manifold 19 in the protuberance 40.

Like this, collide each other, waste gas is stirred, thereby promote mixing of reducing agent contained in the waste gas and waste gas by waste gas.In addition, in the present embodiment, be not provided for dwindling the parts of waste gas flow path cross sectional area yet, therefore can be under the situation of the pressure loss that increases waste gas hardly, promote mixing of reducing agent contained in the waste gas and waste gas.

In addition, as mentioned above, flow direction can be collided towards the part of the waste gas of top with the upper horizontal wall 40b of protuberance 40 with the lower horizontal wall 40c collision of protuberance 40.By the collision of this and upper horizontal wall 40b, the velocity component towards the top of waste gas is reduced, and waste gas is stirred, promote mixing of reducing agent contained in the waste gas and waste gas.In addition, with the upper horizontal wall 40b collision of protuberance 40 flow direction can be collided with the lower horizontal wall 40c of protuberance 40 towards the part of the waste gas of below.By with the collision of this lower horizontal wall 40c, the velocity component towards the below of waste gas is reduced, and waste gas is stirred, promote mixing of reducing agent contained in the waste gas and waste gas.

Below, with reference to Fig. 4 A and Fig. 4 B the 3rd mode of execution of the present invention is described.Fig. 4 A and Fig. 4 B be the 3rd mode of execution catalytic cleaner 21 with Fig. 2 A and the same enlarged view of Fig. 2 B.The formation of the Exhaust gas purifying device of the 3rd mode of execution formation with the Exhaust gas purifying device of first mode of execution basically is identical.Wherein, in the Exhaust gas purifying device of second mode of execution, the cross section of the protuberance 35 on housing 30 circumferencial directions is half elliptic roughly, and in the Exhaust gas purifying device of the 3rd mode of execution, the cross section of the protuberance 45 on housing 30 circumferencial directions is a circular.

Shown in Fig. 4 A, protuberance 45 has upside wall 45a that tilts again and the downside wall 45b that tilts upward downwards downwards after the radial outside of housing 30 tilts earlier after the radial outside of housing 30 tilts earlier upward.

The following describes waste gas flowing in discharge manifold 19 that constitutes like this and housing 30.The waste gas that comprises reducing agent that flows through in discharge manifold 19 flow in the protuberance 45 after the outlet of discharge manifold 19 is flowed out.Because the downside wall 45b of protuberance 45 elder generation tilts after tilting downwards more upward, the waste gas that therefore flows through the bottom of the part 19a of menifold outlet near flow into protuberance 45, and so at first the part that tilts downwards along downside wall 45b flows.Then, with the part that tilts the upward collision of the downside wall 45b of protuberance 45.By this collision, the flow direction that makes waste gas is towards the top.

On the other hand, because the upside wall 45a of protuberance 45 tilts downwards after tilting upward earlier again, therefore the waste gas that flows through the top of the part 19a of menifold outlet near flow into protuberance 45, and so at first the part that tilts upward along upside wall 45a flows.Then, with the part that tilts the downwards collision of the upside wall 45a of protuberance 45.By this collision, the flow direction that makes waste gas is towards the below.

Then, waste gas that flows towards the top with the downside wall 45b of protuberance 45 collision and the waste gas that flows towards the below with the upside wall 45a collision of protuberance 45 collide mutually, promote mixing of reducing agent contained in the waste gas and waste gas thus.

In addition, because of the part that tilts the upward collision with the downside wall 45b of protuberance 45 makes the waste gas of flow direction towards the top, even not with make the waste gas collision of flow direction downwards towards the below because of the part that tilts collision with the upside wall 45a of protuberance 45, also can with the upside wall 45a collision of protuberance 45.By the collision of this and upside wall 45a, the velocity component towards the top of waste gas is reduced, and waste gas is stirred, promote mixing of reducing agent contained in the waste gas and waste gas.

On the other hand, because of the part that tilts the downwards collision with the upside wall 45a of protuberance 45 makes the waste gas of flow direction towards the below, even not with make the waste gas collision of flow direction towards the top because of the part that tilts upward collision with the downside wall 45b of protuberance 45, also can with the downside wall 45b collision of protuberance 45.By the collision of this and downside wall 45b, the velocity component towards the below of waste gas is reduced, and waste gas is stirred, promote mixing of reducing agent contained in the waste gas and waste gas.

In addition, be not provided for dwindling the parts of waste gas flow path cross sectional area in the present embodiment yet, therefore can be under the situation that increases the exhaust gas pressure loss hardly, promote mixing of reducing agent contained in the waste gas and waste gas.

Yet, utilize the protuberance of the arbitrary shape shown in above-mentioned first mode of execution to the, three mode of executions, can both be under the situation that increases the exhaust gas pressure loss hardly, promote mixing of reducing agent and waste gas.At this, can think and no matter adopt above-mentioned any protuberance shape that the waste gas that flows through near the bottom of the part 19a menifold outlet collides with the downside wall of protuberance, and makes its flow direction towards the top, promotes mixing etc. between reducing agent and the waste gas thus.Thereby, as long as we can say protuberance can make its wall a part can with flow into protuberance waste gas at least a portion air-flow the velocity component on housing 30 axial directions towards above, then can be arbitrary shape.

In addition, can think the protuberance that no matter adopts any shape shown in first mode of execution to the, three mode of executions, the waste gas that flows through near the top of the part 19a menifold outlet is all with the upside wall collision of protuberance and make its flow direction towards the below, and bump with other waste gas that flow into protuberance, promote mixing etc. between reducing agent and the waste gas thus.Thereby, even, then can be arbitrary shape as long as we can say that protuberance forms the waste gas that at least a portion that can make the waste gas that the velocity component that makes with the touching of its wall towards the below increased and wall touching with protuberance do not increase towards the velocity component of below yet and produces collision.

In addition, can think the protuberance that no matter adopts any shape shown in first mode of execution to the, three mode of executions, the waste gas that flows through near the top of the part 19a menifold outlet is all with the upside wall collision of protuberance and make its flow direction towards the below, then by and the downside wall of protuberance between collision, make reducing of waste gas, promote mixing etc. between reducing agent and the waste gas thus towards the velocity component of below.Similarly, can think that the waste gas that flows through near the bottom of the part 19a menifold outlet is all with the downside wall collision of protuberance and make its flow direction towards the top, then by and the upside wall of protuberance between collision, make reducing of waste gas, promote mixing etc. between reducing agent and the waste gas thus towards the velocity component of top.Thereby, as long as we can say that protuberance forms at least a portion of the waste gas that the velocity component that makes with the touching of the part of its wall towards the direction of exhaust gas purification unit increased is touched with the other parts of the wall of protuberance, and the velocity component of this waste gas on this direction reduced, then can be arbitrary shape.

Below, with reference to Fig. 5 A and Fig. 5 B the 4th mode of execution of the present invention is described.Fig. 5 A and Fig. 5 B be the 4th mode of execution catalytic cleaner 21 with Fig. 2 A and the same enlarged view of Fig. 2 B.The formation of the Exhaust gas purifying device of the 4th mode of execution formation with the Exhaust gas purifying device of first mode of execution basically is identical.Wherein, in the Exhaust gas purifying device of first mode of execution, part 19a vertically extends with respect to axis L near the menifold outlet, and in the present embodiment, part 50a extends obliquely with respect to axis L near the menifold outlet.

Shown in Fig. 5 A, the discharge manifold 50 of present embodiment connects the wall of tapered portion 32 and extends at the upper section of the tapered portion 32 of housing 30.Shown in Fig. 5 A, discharge manifold 50 is at the position of the wall that connects tapered portion 32, with respect to the axis L inclination of housing 30.In addition, discharge manifold 50 linearly extends in tapered portion 32.Therefore, part 50a also extends obliquely with respect to axis L near the menifold outlet, and extends obliquely with respect to the wall of tapered portion 32.

In addition, shown in Fig. 5 A and Fig. 5 B, part 50a extends towards protuberance 35 near the menifold outlet.In other words, part 50a extends in the mode that its axis M enters in the protuberance 35 near the menifold outlet.

The following describes waste gas flowing in the discharge manifold 50 of this formation and housing 30.Because part 50a extends towards protuberance 35 near the menifold outlet, the waste gas that contains reducing agent that therefore flows through discharge manifold 50 flows out and flow in the protuberance 35 from the outlet of discharge manifold 50.The downside wall 35b collision of near waste gas that the bottom of part 50a is flow through the menifold outlet and protuberance 35.By this collision, the flow direction that makes waste gas is towards the top.On the other hand, the waste gas that flows through near the top of the 50a menifold outlet is moving and make its flow direction towards the below along the upper side wall surface current of protuberance 35, perhaps with upside wall 35a collision and make its flow direction towards the below.

Like this, and downside wall 35b collision and make flow direction towards the waste gas of top with flow along upside wall 35a or collide with it and flow direction is collided between the waste gas of below mutually, promote mixing of reducing agent contained in the waste gas and waste gas thus.In addition, make waste gas and the upside wall 35a collision of flow direction with downside wall 35b collision towards the top, and with upside wall 35a collision and flow direction is collided with downside wall 35b towards the waste gas of below, also can promote mixing of reducing agent contained in the waste gas and waste gas thus.And, be not provided for dwindling the parts of waste gas flow path cross sectional area in the present embodiment yet, therefore can under the situation that increases the exhaust gas pressure loss hardly, promote mixing of reducing agent contained in the waste gas and waste gas.

In addition, in the present embodiment, preferably constitute protuberance 35 is extended obliquely with respect to circumferencial direction, promptly extend with respect to the plane inclination ground vertical with axis L.Especially, by make protuberance 35 with from the zone faced mutually with the outlet of discharge manifold 19 along with along the circumferential direction tilting away from the mode that makes this protuberance more and more be positioned at downside, and the waste gas that flows into obliquely with respect to protuberance 35 is along the circumferential direction flowed easily in protuberance 35.

Below with reference to Fig. 6 A and Fig. 6 B the 5th mode of execution of the present invention is described.Fig. 6 A and Fig. 6 B be the 5th mode of execution catalytic cleaner 21 with Fig. 2 A and the same enlarged view of Fig. 2 B.The formation of the Exhaust gas purifying device of the 5th mode of execution formation with the Exhaust gas purifying device of the 4th mode of execution basically is identical.Wherein, in the Exhaust gas purifying device of the 4th mode of execution, discharge manifold 50 connects the wall of tapered portion 32 and extends in the tapered portion 32, and in the Exhaust gas purifying device of the 5th mode of execution, discharge manifold 55 does not connect the wall of tapered portion 32, thereby does not extend in the tapered portion 32.

As shown in Figure 6A, the exit portion of the discharge manifold 55 of present embodiment directly is connected with the tapered portion 32 of housing 30.In addition, discharge manifold 55 extends obliquely with respect to axis L, and extends obliquely with respect to the wall of tapered portion 32.And then as shown in Figure 6A, part 55a extends towards protuberance 35 near the menifold outlet.In other words, part 55a extends in the mode that its axis M enters in the protuberance 35 near the menifold outlet.

In the discharge manifold 55 and housing 30 that constitute like this, part 55a extends towards protuberance 35 near the menifold outlet, and the major part that therefore flows through the waste gas that contains reducing agent of discharge manifold 50 flows out and flow in the protuberance 35 from the outlet of discharge manifold 55.Near the waste gas that the bottom of part 50a is flow through menifold outlet and the downside wall 35b of protuberance 35 collide and make its flow direction towards above.On the other hand, near the waste gas that the top of part 50a is flow through menifold outlet along the downside wall 35b of protuberance 35 flow or collide with upside wall 35a and make its flow direction towards below.These waste gas collide mutually, promote mixing of reducing agent contained in the waste gas and waste gas thus.

In addition and since from discharge manifold 55 export to till the protuberance 35 distance from, therefore the part of the waste gas that flows out from the outlet of discharge manifold 55 can not flow into protuberance 35, but is fed directly to NOx storage and reduction catalyst 20.At this, when waste gas flow into protuberance 35, therefore the flow direction of waste gas meeting rapid change can produce some pressure losses.With respect to this,, therefore reduced the exhaust gas flow that flow into protuberance 35, thereby also can reduce the pressure loss because the part of the waste gas that flows out from the outlet of discharge manifold 55 is fed directly to NOx storage and reduction catalyst 20.In addition, be not provided for dwindling the parts of waste gas flow path cross sectional area in the present embodiment yet.Therefore, present embodiment can promote mixing of reducing agent contained in the waste gas and waste gas under further suppressing the situation that the exhaust gas pressure loss increases.

Yet, no matter be the discharge manifold of which shape shown in above-mentioned first mode of execution, the 5th mode of execution and the 6th mode of execution, can both promote mixing of reducing agent and waste gas under the situation of exhaust gas pressure loss increasing hardly., can think the protuberance that no matter adopts any shape shown in the above-mentioned mode of execution herein, part is all towards protuberance near the menifold outlet, and promptly the mode that enters in the protuberance with its axis M is extended, and promotes mixing etc. between reducing agent and the waste gas thus.Thereby, we can say discharge manifold so long as near the mode that the axis M of part passes in the protuberance its outlet is extended, then can be arbitrary shape.

Below, with reference to Fig. 7 A and Fig. 7 B the 6th mode of execution of the present invention is described.Fig. 7 A and Fig. 7 B be the 6th mode of execution catalytic cleaner 21 with Fig. 2 A and the same enlarged view of Fig. 2 B.The formation of the Exhaust gas purifying device of the 6th mode of execution formation with the Exhaust gas purifying device of first mode of execution basically is identical.Wherein, in the Exhaust gas purifying device of first mode of execution, protuberance 35 is that part is extended more than half circumference of the leap on the circumferencial direction of housing 30, and in the present embodiment, protuberance 60 is only partly to extend below half circumference on the circumferencial direction of housing 30.

Below, waste gas flowing in discharge manifold 19 that constitutes like this and housing 30 is described.Same with the protuberance 35 of first mode of execution, flow into waste gas in the protuberance 60 with the wall collision of protuberance 60 flow direction of change above-below direction, promote mixing of reducing agent and waste gas thus.

On the other hand, in the present embodiment, the width W of protuberance 60 on housing 30 circumferencial directions is less, and be therefore different with the protuberance 35 of first mode of execution, and the waste gas that flow into protuberance 60 is difficult to along the wall of protuberance 60 and towards circumferencial direction two side flow of housing 30.Therefore therefore, in protuberance 60, the waste gas of inflow can along the circumferential direction not spread, and can produce bigger turbulent flow, can promote mixing of reducing agent and waste gas thus yet.

If like this inlet width W in a circumferential direction of protuberance 60 is dwindled, reducing agent is mixed with waste gas.But, also littler if the inlet W in a circumferential direction of protuberance 60 is excessively dwindled than the outlet diameter d of discharge manifold 19, then can make the width W of the inlet of protuberance 60 become restriction, cause the pressure loss of waste gas to increase.Therefore, it is bigger than the outlet diameter d of discharge manifold 19 to be preferably the width W of the inlet that makes protuberance 60.

Equally, also the outlet diameter d than discharge manifold 19 is little at the height on the above-below direction (height on housing 30 axial directions) if make the inlet of protuberance 60, then can make the height h of the inlet of protuberance 60 become restriction, causes the pressure loss of waste gas to increase.Therefore, it is bigger than the outlet diameter d of discharge manifold 19 to be preferably the height h of the inlet that makes protuberance 60.

Or rather, with housing 30 (tapered portion 32) in the sectional area X of inlet of the protuberance 60 faced mutually of space when also littler than the sectional area of the outlet of discharge manifold 19, the inlet of protuberance 60 becomes restriction.Thereby,, need make the sectional area X of inlet of protuberance 60 littler than the sectional area of the outlet of discharge manifold 19 for the restriction of the inlet that prevents protuberance 60 causes the pressure loss of waste gas to increase.

Below, with reference to Fig. 8 A and Fig. 8 B the 7th mode of execution of the present invention is described.Fig. 8 A and Fig. 8 B be the 7th mode of execution catalytic cleaner 21 with Fig. 2 A and the same enlarged view of Fig. 2 B.The formation of the Exhaust gas purifying device of the 7th mode of execution formation with the Exhaust gas purifying device of first mode of execution basically is identical.Wherein, in the Exhaust gas purifying device of first mode of execution, the outlet of discharge manifold 19 does not enter in the protuberance 35, and in the present embodiment, the outlet of discharge manifold 19 enters in the protuberance 35.

Herein, the part of the reducing agent of supplying with from reducer feeding device 22 can not be scattered in the waste gas that flows discharge manifold 19 in sometimes, and mobile in discharge manifold 19 as drop.The reducing agent of this drop state falls along gravitational direction from the outlet of discharge manifold 19, and flow into NOx storage and reduction catalyst 20.If reducing agent does not mix with waste gas and flow into NOx storage and reduction catalyst 20 with the drop state, then might waste gas can not be purified fully.Therefore, for example needing, reducing agent flow into NOx storage and reduction catalyst 20 with the drop state.

In the present embodiment, as mentioned above, the outlet of discharge manifold 19 enters in the protuberance 35.Therefore, even reducing agent falls along gravitational direction with the outlet of drop state from discharge manifold 19, this reducing agent is not directly fallen on the NOx storage and reduction catalyst 20 yet, and is attached on the downside wall 35b of protuberance 35.

, as mentioned above,, therefore can make the reducing agent evaporation of the drop state on the downside wall 35b that is attached to protuberance 35 herein, mix with waste gas then owing in protuberance 35, can produce the turbulent flow of waste gas.Thereby,,, this reducing agent is suitably mixed with waste gas even the part of the reducing agent of supplying with from reducer feeding device 22 flows out from the outlet of discharge manifold 19 with the drop state according to present embodiment.

Below, with reference to Fig. 9 A and Fig. 9 B the 8th mode of execution of the present invention is described.Fig. 9 A and Fig. 9 B be the 8th mode of execution catalytic cleaner 21 with Fig. 2 A and the same enlarged view of Fig. 2 B.The formation of the Exhaust gas purifying device of the 8th mode of execution formation with the Exhaust gas purifying device of first mode of execution basically is identical.Wherein, in the Exhaust gas purifying device of first mode of execution, part at the internal face of the tapered portion of facing mutually with the outlet of discharge manifold 19 32 is provided with protuberance 35, and in the present embodiment, is provided with towards outstanding two protrusion members 71,72 of the radially inner side of housing 30.

Shown in the side sectional view of Fig. 9 A, the downside wall 71a of upside protrusion member 71 tilts downwards towards the radial outside of housing 30, and the upside wall 71b of upside protrusion member 71 tilts upward towards the radial outside of housing 30.On the other hand, the upside wall 72a of lower projection parts 72 tilts upward towards the radial outside of housing 30, and the downside wall 72b of lower projection parts 72 tilts downwards towards the radial outside of housing 30.In the illustrated embodiment, the upside wall 72a of the downside wall 71a of upside protrusion member 71 and lower projection parts 72 bends to concavity.

In addition, shown in Fig. 9 B, these protrusion members 71,72 are from extending towards the circumferencial direction both sides of housing 30 with the zone that the outlet of discharge manifold 19 is faced mutually.If will be never the degree of depth that plays at the radially the most outstanding protrusion member 71,72 of housing 30 of the internal face of 71,72 o'clock tapered portion 32 of protrusion member be made as D, then the depth D of protrusion member 71,72 from the zone faced mutually with the outlet of discharge manifold 19 along with the circumferencial direction along housing 30 shoals gradually away from this zone.Especially shown in Fig. 9 B, in the present embodiment, protrusion member 71,72 form roughly half elliptic interior week.In addition, in the present embodiment, protrusion member 71,72 partly extends more than the circumferencial direction of housing 30 is being crossed over half circumference.

Even discharge manifold 19 of Gou Chenging and housing 30 also can access and the same effect of first mode of execution shown in Fig. 2 A and Fig. 2 B like this.That is the waste gas that comprises reducing agent that, flows through in discharge manifold 19 is from flowing into after the outlet of discharge manifold 19 is flowed out in the space between two protrusion members 71,72.The upside wall 72a collision of near waste gas that the bottom of part 19a is flow through the menifold outlet and lower projection parts 72.By this collision, the flow direction that makes waste gas is towards the top.On the other hand, the downside wall 71a collision of near waste gas that the top of part 19a is flow through the menifold outlet and upside protrusion member 71.By this collision, the flow direction that makes waste gas is towards the below.

If like this with the flow direction of the waste gas of the upside wall 72a of lower projection parts 72 collision towards the top, and with the flow direction of the waste gas of the downside wall 71a collision of upside protrusion member 71 towards the below, then these waste gas collide mutually.Like this, collide mutually by two strands of waste gas waste gas is stirred, promote mixing of reducing agent contained in the waste gas and waste gas thus.

In addition, make the waste gas of its flow direction with the upside wall 72a collision of lower projection parts 72 towards the top, even with the downside wall 71a collision of upside protrusion member 71 do not make the waste gas collision of flow direction, can collide yet with the upside wall 72a of lower projection parts 72 towards the below.By the collision of this and upside wall 72a, the velocity component towards the top of waste gas is reduced, and waste gas is stirred, promote mixing of reducing agent contained in the waste gas and waste gas.This point also is same for making its flow direction with the downside wall 71a collision of upside protrusion member 71 for the waste gas of below.

And, in the above-described 8th embodiment, the internal face of housing 30 is provided with the protrusion member 71,72 with housing 30 splits, but the internal face self of housing 30 is out of shape in the mode of giving prominence to the radially inner side of housing 30, thereby on the internal face of housing 30 protruding part is set.In a word, the Exhaust gas purifying device of present embodiment can possess the jut of giving prominence to towards the radially inner side of housing 30 from the internal face of delimiting housing 30.

Sum up above mode of execution, we can say on housing 30 internal faces with discharge manifold outlet near the part setting faced mutually of part 19a (for example flow to deflector, protuberance 35,40,45,60 that on the internal face of above-mentioned housing 30, is provided with and jut 71,72), flow to the upstream side that deflector is positioned at NOx storage and reduction catalyst 20, and form make the velocity component of at least a portion air-flow on housing 30 axial directions that flow into the waste gas that flows to deflector be orientated with towards the side of NOx storage and reduction catalyst 20 in the opposite direction.

Perhaps, on the internal face of housing 30 with discharge manifold outlet near the part setting faced mutually of part 19a flow to deflector, flow to the upstream side that deflector is positioned at NOx storage and reduction catalyst 20, and the wall that flows to deflector forms: make at least a portion of the waste gas that velocity component towards NOx storage and reduction catalyst 20 directions has increased and the other parts touching of the wall that flows to deflector with the touching of the part of the wall that flows to deflector, and the velocity component of waste gas on this direction reduced.

In addition, in the above-mentioned mode of execution, the discharge manifold 19 that will be connected with internal combustion engine main body 1 directly is connected with the housing 30 of catalytic cleaner 21, but also can be that the outlet pipe that will directly or indirectly be connected with discharge manifold 19 is connected with the housing 30 of catalytic cleaner 21.

In addition, also the respective embodiments described above combination with one another can be constituted Exhaust gas purifying device.For example, the Exhaust gas purifying device of second mode of execution and the 4th mode of execution can be made up, thereby the cross section that is formed in the protuberance of housing 30 circumferencial directions is near the Exhaust gas purifying device that part is extended obliquely with respect to axis L rectangle and the menifold outlet.In addition, for example the Exhaust gas purifying device of second mode of execution and the 8th mode of execution can be made up, thereby constitute the downside wall 71a of upside protrusion member 71 and the upside wall 72a Exhaust gas purifying device vertical of downstream side protrusion member 72 with respect to the axial direction of housing 30.

More than, based on specific mode of execution the present invention has been described, but those of ordinary skills can carry out various changes and modification etc. in the scope that does not break away from claims of the present invention and design.

Description of reference numerals is as follows:

19,50,55... discharge manifold; Near part 19a, 50a, the outlet of 55a... menifold; 20...NOx storage and reduction catalyst; 21... catalytic cleaner; 30... housing; 31... catalyzer container; 32... tapered portion; 35,40,45,60... protuberance.

Claims (20)

1. the Exhaust gas purifying device of an internal-combustion engine possesses: the upstream side exhaust passage, wherein flow through the waste gas of discharging from internal-combustion engine; The exhaust passage, downstream side, it is configured in the downstream side of this upstream side exhaust passage and with respect to upstream side exhaust passage angulation; The reducing agent feed unit, it supplies with reducing agent in the waste gas of process in the upstream side exhaust passage; And the exhaust gas purification unit, it is arranged in the exhaust passage, downstream side, and this Exhaust gas purifying device is characterised in that,

Exporting opposed part with the upstream side exhaust passage and be provided with and flow to deflector at the internal face of delimiting the exhaust passage, downstream side, this flows to the upstream side that deflector is positioned at the exhaust gas purification unit, and form make the velocity component of at least a portion air-flow on the axial direction of exhaust passage, downstream side that flow into this waste gas that flows to deflector be orientated with towards the side of exhaust gas purification unit in the opposite direction.

2. the Exhaust gas purifying device of internal-combustion engine according to claim 1, it is characterized in that, in the zone of close exhaust gas purification unit one side of delimiting the above-mentioned wall that flows to deflector, have towards the radial outside of exhaust passage, downstream side and towards the part that tilts in the opposite direction with side towards the exhaust gas purification unit.

3. the Exhaust gas purifying device of an internal-combustion engine possesses: the upstream side exhaust passage, wherein flow through the waste gas of discharging from internal-combustion engine; The exhaust passage, downstream side, it is configured in the downstream side of this upstream side exhaust passage and with respect to upstream side exhaust passage angulation; The reducing agent feed unit, it supplies with reducing agent in the waste gas of process in the upstream side exhaust passage; And the exhaust gas purification unit, it is arranged in the exhaust passage, downstream side, and this Exhaust gas purifying device is characterised in that,

Exporting opposed part with the upstream side exhaust passage and be provided with and flow to deflector at the internal face of delimiting the exhaust passage, downstream side, this flows to the upstream side that deflector is positioned at the exhaust gas purification unit, this wall that flows to deflector forms: with this flow to deflector wall part touching and make at least a portion of the waste gas that velocity component towards the direction of exhaust gas purification unit has increased and the other parts touching of this wall that flows to deflector, and make the velocity component reduction on this direction of this waste gas.

4. the Exhaust gas purifying device of internal-combustion engine according to claim 3, it is characterized in that, delimit the zone away from a side of exhaust gas purification unit of the above-mentioned wall that flows to deflector, have towards the radial outside of exhaust passage, downstream side and the part that tilts to direction towards the exhaust gas purification unit.

5. according to the Exhaust gas purifying device of each described internal-combustion engine in the claim 1～4, it is characterized in that, the above-mentioned deflector that flows to possesses protuberance, and this protuberance is that the internal face self of delimiting the exhaust passage, downstream side is given prominence to and formed towards the radial outside of exhaust passage, downstream side.

6. the Exhaust gas purifying device of internal-combustion engine according to claim 5 is characterized in that, the cross section of above-mentioned protuberance on the circumferencial direction of exhaust passage, downstream side is half elliptic roughly.

7. according to the Exhaust gas purifying device of claim 5 or 6 described internal-combustion engines, it is characterized in that, towards the inlet area of the above-mentioned protuberance of exhaust passage, above-mentioned downstream side sectional area greater than the upstream side exhaust passage.

8. the Exhaust gas purifying device of internal-combustion engine according to claim 7 is characterized in that, the height of above-mentioned protuberance on the axial direction of exhaust passage, downstream side is greater than the diameter of upstream side exhaust passage.

9. according to the Exhaust gas purifying device of each described internal-combustion engine in the claim 5～8, it is characterized in that above-mentioned protuberance extends along exhaust passage, above-mentioned downstream side circumferencial direction.

10. the Exhaust gas purifying device of internal-combustion engine according to claim 9 is characterized in that, the degree of depth that above-mentioned protuberance directly makes progress in the exhaust passage, downstream side is along with away from exporting opposed zone with above-mentioned upstream side exhaust passage and reducing.

11. the Exhaust gas purifying device according to claim 9 or 10 described internal-combustion engines is characterized in that the peripheral shape of above-mentioned protuberance becomes roughly half elliptic.

12. Exhaust gas purifying device according to each described internal-combustion engine in the claim 9～11, it is characterized in that, above-mentioned protuberance is inclined to: from exporting opposed zone with above-mentioned upstream side exhaust passage, along with along exhaust passage, downstream side circumferencial direction away from, this protuberance approaches the exhaust gas purification cell side more.

13. the Exhaust gas purifying device according to each described internal-combustion engine in the claim 5～12 is characterized in that, extend in the mode that near its central axis its outlet passes in the protuberance above-mentioned upstream side exhaust passage.

14. the Exhaust gas purifying device according to each described internal-combustion engine in the claim 5～13 is characterized in that, near above-mentioned upstream side exhaust passage central axis with respect to the exhaust passage, downstream side its outlet extends obliquely.

15. the Exhaust gas purifying device according to each described internal-combustion engine in the claim 5～13 is characterized in that, near above-mentioned upstream side exhaust passage central axis with respect to the exhaust passage, downstream side its outlet vertically extends.

16. the Exhaust gas purifying device according to each described internal-combustion engine in the claim 5～15 is characterized in that, above-mentioned upstream side exhaust passage enters in the exhaust passage, downstream side and extends.

17. the Exhaust gas purifying device according to each described internal-combustion engine in the claim 5～16 is characterized in that, the outlet of above-mentioned upstream side exhaust passage enters in the above-mentioned protuberance.

18. Exhaust gas purifying device according to claim 1 or 3 described internal-combustion engines, it is characterized in that, the above-mentioned deflector that flows to possesses protuberance, this protuberance is that the internal face self of delimiting the exhaust passage, downstream side is given prominence to and formed towards the radial outside of exhaust passage, downstream side, and the cross section of this protuberance on the circumferencial direction of exhaust passage, downstream side is essentially rectangular.

19. Exhaust gas purifying device according to each described internal-combustion engine in the claim 1～18, it is characterized in that, the above-mentioned deflector that flows to possesses protuberance, and this protuberance is that the internal face of delimiting the exhaust passage, downstream side is given prominence to and formed towards the radially inner side of exhaust passage, downstream side.

20. Exhaust gas purifying device according to each described internal-combustion engine in the claim 1～19, it is characterized in that, above-mentioned upstream side exhaust passage delimited by discharge manifold or with the direct-connected outlet pipe of discharge manifold, and exhaust passage, above-mentioned downstream side is the tapered portion in the upstream portion setting of the catalytic cleaner of taking in the exhaust gas purification unit.

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