CN211116211U

CN211116211U - Exhaust system waste heat recovery device and vehicle exhaust system

Info

Publication number: CN211116211U
Application number: CN201921962209.0U
Authority: CN
Inventors: 黄兴来; 张剑; 曾志新; 张凯; 陈玉光; 何靖慧
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-07-28
Anticipated expiration: 2029-11-13

Abstract

The utility model provides an exhaust system waste heat recovery device and vehicle exhaust system, includes: the exhaust system comprises a waste heat recovery body positioned at the downstream of an exhaust end of an engine, an airflow inlet channel communicated with an outlet of the waste heat recovery body, a rear catalyst/rear particle catcher communicated with an outlet of the airflow inlet channel, an airflow exhaust channel communicated with an outlet of the rear catalyst/rear particle catcher, and a water storage shell hermetically arranged on the outer side of a shell of the rear catalyst/rear particle catcher to form a water storage cavity, wherein a drainage hole is arranged below the front end of the rear catalyst/rear particle catcher. The utility model discloses an add the drainage hole in the front end below of rear catalyst converter/back particle trapper, add water storage shell in its outside with common formation water storage chamber to can store the comdenstion water drainage that the precooling formed to the water storage chamber, avoid the comdenstion water to damage rear catalyst converter/back particle trapper itself and inside liner, guarantee its life, and promoted the environmental protection performance of whole car.

Description

Exhaust system waste heat recovery device and vehicle exhaust system

Technical Field

The utility model relates to the field of automotive technology, especially, relate to an exhaust system waste heat recovery device and vehicle exhaust system.

Background

With the strictness of emission regulations, further reduction of oil consumption becomes a main direction of future development, and exhaust waste heat recovery is an advantageous way to improve emission and reduce oil consumption, but after a vehicle stops working, an exhaust system with an exhaust waste heat recovery device can condense stable and high combustion exhaust gas into water droplets due to rapid temperature reduction of a cooling surface, and the water droplets form water flow and are collected at a subsequent catalyst/GPF (gasoline Particulate Filter)/DPF (Diesel Particulate Filter).

At present, as shown in fig. 1 and fig. 2, in order to reduce oil consumption and improve emission, some vehicle models are equipped with exhaust gas waste heat recovery devices, and in order to maximize recovery efficiency, the waste heat recovery devices need to be arranged close to the exhaust end 1 of the engine as much as possible, but the catalyst ignition cannot be deteriorated, so the exhaust gas waste heat recovery devices 3 are arranged behind the front catalyst/front GPF/front DPF2 and in front of the rear catalyst/rear GPF/rear DPF 4.

Although the arrangement mode reduces oil consumption and improves emission, the problem of prolonging the service life of the rear catalyst/rear GPF/rear DPF4 is also solved, namely, a large amount of condensed water is gathered at the rear catalyst/rear GPF/rear DPF4 due to recovery of exhaust waste heat, the pad loses support and vibration reduction performance due to long-time water erosion due to the part of the accumulated water, so that the rear catalyst/rear GPF/rear DPF4 is cracked due to vibration, water flow directly submerges the rear catalyst/rear GPF/rear DPF4, and further, under long-time soaking of liquid water, the adhesion force of precious metal on the rear catalyst/rear GPF/rear DPF4 is reduced and the precious metal is easily taken away by air flow, thereby causing emission deterioration and environmental pollution.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an exhaust system waste heat recovery device and a vehicle exhaust system capable of discharging condensed water collected in a post-catalyst/post-GPF/post-DPF.

The utility model provides an exhaust system waste heat recovery device, include: the exhaust system comprises a waste heat recovery body positioned at the downstream of an exhaust end of an engine, an airflow inlet channel communicated with an outlet of the waste heat recovery body, a rear catalyst/rear particle catcher communicated with an outlet of the airflow inlet channel, an airflow exhaust channel communicated with an outlet of the rear catalyst/rear particle catcher, and a water storage shell hermetically arranged on the outer side of a shell of the rear catalyst/rear particle catcher to form a water storage cavity, wherein a drainage hole is arranged below the front end of the rear catalyst/rear particle catcher.

In a specific embodiment, the drainage hole is formed in the airflow inlet channel and below the wall portion of the inlet close to the rear catalyst/rear particle trap, and the water storage cavity is formed between the water storage housing and the airflow inlet channel, the rear catalyst/rear particle trap and the airflow exhaust channel.

In a specific embodiment, the drainage holes are a plurality of through holes arranged in parallel in a single row.

In one embodiment, the rear catalyst/rear particle trap includes a first front end cap in communication with the outlet of the airflow inlet duct, a first rear end cap in communication with the outlet of the airflow outlet duct, and an inner housing disposed between the first front end cap and the first rear end cap and together forming an exhaust passage for conveying engine exhaust; the water storage shell comprises a second front end cover correspondingly arranged on the outer side of the first front end cover, a second rear end cover correspondingly arranged on the outer side of the first rear end cover and a shell body correspondingly arranged on the outer side of the inner shell, the front end of the second front end cover is arranged on the airflow inlet channel in a sealing mode in front of the drainage hole, and the rear end of the second rear end cover is arranged on the airflow exhaust channel in a sealing mode.

In a specific embodiment, the front end of the inner housing and the rear end of the second front end cover are integrally formed, or the rear end of the inner housing and the front end of the second rear end cover are integrally formed.

In a specific embodiment, the first front end cover, the first rear end cover, the second front end cover and the rear end cover include cylindrical necking sections and tapered sections formed by outward extension of the necking sections, and the inner shell and the outer shell have corresponding cylindrical structures.

In a specific embodiment, flanges are disposed on the front end of the second front end cover and the rear end of the second rear end cover, the flange on the front end of the second front end cover is formed by inward recessing of the front end of the second front end cover, and the flange on the rear end of the second rear end cover is formed by inward recessing of the rear end of the second rear end cover.

In a specific embodiment, the exhaust system waste heat recovery device includes a front catalyst/front particle trap disposed between the exhaust end of the engine exhaust end and the inlet of the waste heat recovery body, a first exhaust pipe is disposed between the engine exhaust end and the front catalyst/front particle trap, and a second exhaust pipe is disposed between the front catalyst/front particle trap and the waste heat recovery device.

In a particular embodiment, the rear particulate trap includes a rear GPF particulate trap and a rear DPF particulate trap, and the front particulate trap includes a front GPF particulate trap and a front DPF particulate trap.

The utility model discloses still relate to a vehicle exhaust system, it includes above exhaust system waste heat recovery device.

To sum up, the utility model discloses an add the drainage hole in the front end below of rear catalyst converter/back particle trapper, add water storage shell in the outside of its casing with common formation water storage chamber to can be after engine stop work, store comdenstion water drainage to water storage chamber, avoid behind the comdenstion water inflow rear catalyst converter/back particle trapper, catalyst converter/back particle trapper damages itself and its inside liner under the soaking of comdenstion water, guarantee its life, and promoted the environmental protection performance of whole car.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a waste heat recovery device of an exhaust system in the prior art;

FIG. 2 is a schematic cross-sectional view of the waste heat recovery body and the post-catalyst/post-GPF/post-DPF of FIG. 1;

fig. 3 is a schematic structural diagram of the exhaust system waste heat recovery device provided by the present invention;

FIG. 4 is a schematic cross-sectional view of the waste heat recovery body, the rear catalyst/rear particle trap, and the water storage housing of FIG. 3;

FIG. 5 is a schematic diagram of the condensed water flowing into the water storage chamber through the drainage holes when the engine stops working;

fig. 6 is a schematic diagram illustrating the principle that when the engine is restarted, the condensed water in the water storage cavity is discharged through the drainage holes.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the invention, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 3-6, the utility model provides an exhaust system waste heat recovery device, it includes: the exhaust heat recovery device comprises a waste heat recovery body 20 positioned at the downstream of an engine exhaust end 10, an airflow inlet channel 30 communicated with the outlet of the waste heat recovery body 20, a rear catalyst/rear particle catcher 40 communicated with the outlet of the airflow inlet channel 30, an airflow exhaust channel 50 communicated with the outlet of the rear catalyst/rear particle catcher 40, a water storage shell 60 of a double-shell structure and hermetically arranged at the outer side of the shell of the rear catalyst/rear particle catcher 40 to form a water storage cavity 100, and a front catalyst/front particle catcher 70 arranged between the exhaust end of the engine exhaust end 10 and the inlet of the waste heat recovery body 20.

The utility model discloses in, back particle trap 40 includes back GPF particle trap and back DPF particle trap, and preceding particle trap 70 includes preceding GPF particle trap and preceding DPF particle trap, and it is also that particle trap 40 includes GPF (gasoline engine) particle trap and DPF (diesel engine) particle trap.

Referring again to fig. 3 and 4, the utility model discloses a lay drainage hole 31 in the front end below of rear catalyst converter/rear particle trapper 40 to seal the both ends of water storage shell 60, so that the water storage chamber 100 front and back end is sealed, and drainage hole 31 is located the inside in water storage chamber 100, and then make water storage chamber 100 only communicate with the inside airflow channel of engine exhaust pipe (airflow channel 30, rear catalyst converter/rear particle trapper 40) through drainage hole 31. Preferably, the drainage hole 31 is formed on the air inlet duct 30 below the wall portion near the inlet of the rear catalyst/rear particle trap 40, and the water storage chamber 100 is formed in the gap between the water storage housing 60 and the air inlet duct 30, the rear catalyst/rear particle trap 40, and the air outlet duct 50 (refer to fig. 4 in detail).

The utility model discloses an add the drainage hole in the front end below of rear catalyst converter/back particle trapper, add water storage shell in the outside of its casing with jointly forming the water storage chamber to can be after engine stop work, store comdenstion water drainage to water storage chamber, avoid the comdenstion water to flow into rear catalyst converter/back particle trapper and damage rear catalyst converter/back particle trapper itself and inside liner, guarantee its life, and promoted the environmental protection ability of whole car.

Specifically, as shown in fig. 5, in the present invention, after the engine is shut down, the waste heat recovery body 20 stops operating, and is rapidly cooled under the action of the cooling liquid, at the moment, a large amount of water vapor formed by the combustion of the engine exhausted from the exhaust end 10 of the engine still stays in an exhaust system, when the water vapor meets the low-temperature pipe walls of the waste heat recovery body 20 and peripheral cooled components, the water vapor condenses into water droplets and collects as condensed water, flows along the air inlet duct 30 and toward the rear catalyst/rear particle trap, when the water flows through the drainage holes 31 on the airflow inlet channel 30, the water flows downwards into the water storage cavity 100 for storage, so that the phenomenon that the rear catalyst/rear particle catcher 40 and the liner inside the rear catalyst/rear particle catcher are damaged due to the contact of liquid water with the liner inside the rear catalyst/rear particle catcher is avoided, the service life of the rear catalyst/rear particle catcher is ensured, and the environmental protection capability of the whole vehicle is improved. With respect to the use of the pad in the rear catalyst/rear particle catcher 40 for buffering the carrier, the specific structure and connection relationship thereof can be referred to the prior art and will not be described herein.

When the engine is restarted, the hot air flow drives the water flow to flow out from the drainage hole 31 in the water storage cavity 100, forms water vapor under the impact of the high-temperature air flow, flows into the air flow inlet 30 again, and flows into the rear catalyst/rear particle catcher 40 along with the engine exhaust, so that the damage of the rear catalyst/rear particle catcher and the liner thereof caused by the contact of the liquid water with the liner in the rear catalyst/rear particle catcher is further avoided.

More specifically, as shown in fig. 6, in the case of low and medium rotation speed of the engine, since the pressure difference △ P between the water storage chamber 100 and the air intake duct 30 is not large enough, the accumulated water in the water storage chamber 100 cannot be sucked away, and at this time, only the accumulated water in the water storage chamber 100 is heated, and when the temperature exceeds the boiling point, the condensed water turns into water vapor and enters the air intake duct 30 through the drainage hole 31, and then is mixed with the engine exhaust gas and discharged through the rear catalyst/rear particle trap 40.

Under the high rotational speed condition of engine, on the one hand, because pressure differential △ P in water storage chamber 100 and the air current intake duct 30 is enough big, can directly siphon away the ponding in the water storage chamber 100, on the other hand, under the effect of high temperature, high velocity air, the comdenstion water is being heated more than the boiling point, and ponding can become vapor and get into air current intake duct 30 through drainage hole 31 to through back catalyst converter/back granule trapper 40 and discharge.

Further, the utility model discloses in, be equipped with first blast pipe 71 between engine exhaust end 10 and preceding catalyst converter/preceding particle trapper 70, be equipped with second blast pipe 72 between preceding catalyst converter/preceding particle trapper 70 and the waste heat recovery device, promptly, engine exhaust end 10, first blast pipe 71, preceding catalyst converter/preceding particle trapper 70, second blast pipe 72, waste heat recovery body 20, air current intake duct 30, after catalyst converter/GPF and the whole of water storage shell 60 formation constitute the total exhaust passage of the vapor that the transmission engine burning formed jointly.

Specifically, as shown in FIG. 4, the rear catalyst/particulate trap 40 includes a first front end cover 41 in communication with the outlet of the airflow inlet duct 30, a first rear end cover 42 in communication with the outlet of the airflow outlet duct 50, and an inner housing 43 disposed between the first front end cover 41 and the first rear end cover 42 and together forming an exhaust passage 400 through which engine exhaust is transferred.

Correspondingly, the water storage housing 60 includes a second front cover 61 correspondingly disposed outside the first front cover 41, a second rear cover 62 correspondingly disposed outside the first rear cover 42, and an outer housing 63 correspondingly disposed outside the inner housing 43.

Preferably, the first front end cap 41, the first rear end cap 42, the second front end cap 61 and the rear end cap 62 include a cylindrical necking section and a tapered section formed by extending the necking section outwards, the inner housing 43 and the outer housing 63 are of corresponding cylindrical structures, that is, the first front end cap 41, the first rear end cap 42, the second front end cap 61 and the second rear end cap 62 are circular end cones with linear necking, the necking ends of the circular end cones are close to the airflow inlet duct 30 or the airflow outlet duct 50, and the inner diameter of the outer housing 63 is larger than the outer diameter of the inner housing 43, but the size of the outer housing can ensure that the volume of the water storage cavity 100 is large enough to store enough condensed water.

The utility model discloses in, the sealed place ahead of locating drainage hole 31 on the air current intake duct 30 of front end of second front end housing 61, the rear end of second rear end housing 62 is sealed on air current exhaust passage 50 to guarantee the leakproofness in water storage chamber 100.

The utility model provides a be equipped with the turn-ups on the front end of second front end housing 61 and the rear end of second rear end housing 62. In more detail, the flange at the front end of the second front end cover 61 is formed by inward recessing of the front end edge of the second front end cover 61, and the flange at the rear end edge of the second rear end cover 62 is formed by inward recessing of the rear end of the second rear end cover, that is, the water storage housing 60 is welded and sealed on the airflow inlet 30 and the airflow outlet 50 by the flanges at both ends.

In a specific embodiment of the present invention, the front end of the inner housing 43 and the rear end of the second front end cover 61 are integrally formed, so that the water storage housing 60 and the installation of the air inlet duct 30, the rear catalyst/rear particle catcher 40, and the air exhaust duct 50 are conveniently installed.

It is understood that in another embodiment provided by the present invention, the rear end of the inner housing 43 may also be integrally formed with the front end of the second rear end cap 62.

To sum up, the utility model discloses an add the drainage hole in the front end below of rear catalyst converter/back particle trapper, add water storage shell in the outside of its casing with common formation water storage chamber to can be after engine stop work, store comdenstion water drainage to water storage chamber, avoid behind the comdenstion water inflow rear catalyst converter/back particle trapper, catalyst converter/back particle trapper damages itself and its inside liner under the soaking of comdenstion water, guarantee its life, and promoted the environmental protection ability of whole car.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.

Claims

1. An exhaust system waste heat recovery device, comprising: the exhaust heat recovery device comprises a waste heat recovery body (20) located on the downstream of an engine exhaust end (10), an air flow inlet channel (30) communicated with an outlet of the waste heat recovery body (20), a rear catalyst/rear particle catcher (40) communicated with an outlet of the air flow inlet channel (30), an air flow exhaust channel (50) communicated with an outlet of the rear catalyst/rear particle catcher (40), and a water storage shell (60) hermetically arranged on the outer side of a shell of the rear catalyst/rear particle catcher (40) to form a water storage cavity (100), wherein a drainage hole (31) is formed below the front end of the rear catalyst/rear particle catcher (40).

2. The exhaust system waste heat recovery device according to claim 1, wherein the drainage hole (31) is formed on the air inlet duct (30) below a wall portion near an inlet of the rear catalyst/rear particle trap (40), and the water storage cavity (100) is formed between the water storage housing (60) and the air inlet duct (30), the rear catalyst/rear particle trap (40), and the air outlet duct (50).

3. The exhaust system waste heat recovery device according to claim 1, wherein the drainage holes (31) are a single row of multiple through holes arranged in parallel.

4. The exhaust system waste heat recovery device according to claim 1, wherein the rear catalyst/particulate trap (40) includes a first front end cover (41) communicating with an outlet of the airflow intake duct (30), a first rear end cover (42) communicating with an outlet of the airflow exhaust duct (50), and an inner housing (43) provided between the first front end cover (41) and the first rear end cover (42) and together forming an exhaust passage (400) for conveying engine exhaust gas; the water storage shell (60) is including corresponding locating second front end housing (61) in first front end housing (41) outside, correspond and locate second rear end housing (62) in first rear end housing (42) outside and correspond and locate shell body (63) in interior casing (43) outside, the front end of second front end housing (61) is sealed to be located on air current intake duct (30) the place ahead of drainage hole (31), the rear end of second rear end housing (62) seal in on air current exhaust duct (50).

5. The exhaust system waste heat recovery device according to claim 4, wherein a front end of the inner housing (43) is integrally formed with a rear end of the second front end cap (61), or a rear end of the inner housing (43) is integrally formed with a front end of the second rear end cap (62).

6. The exhaust system waste heat recovery device according to claim 4, wherein the first front end cover (41), the first rear end cover (42), the second front end cover (61) and the rear end cover (62) comprise a cylindrical necking section and a conical section formed by extending the necking section outwards, and the inner shell (43) and the outer shell (63) are of corresponding cylindrical structures.

7. The exhaust system waste heat recovery device according to claim 5 or 6, wherein flanges are arranged at the front end of the second front end cover (61) and the rear end of the second rear end cover (62), the flanges at the front end of the second front end cover (61) are formed by inwards recessing the front end of the second front end cover (61), and the flanges at the rear end of the second rear end cover (62) are formed by inwards recessing the rear end of the second rear end cover.

8. The exhaust system waste heat recovery device according to claim 1, characterized in that the exhaust system waste heat recovery device comprises a front catalyst/front particle trap (70) arranged between the exhaust end of the engine (10) and the inlet of the waste heat recovery body (20), a first exhaust pipe (71) is arranged between the exhaust end of the engine (10) and the front catalyst/front particle trap (70), and a second exhaust pipe (72) is arranged between the front catalyst/front particle trap (70) and the waste heat recovery device.

9. The exhaust system waste heat recovery device according to claim 8, wherein the rear particulate trap (40) includes a rear GPF particulate trap and a rear DPF particulate trap, and the front particulate trap (70) includes a front GPF particulate trap and a front DPF particulate trap.

10. A vehicle exhaust system characterized by comprising the exhaust system waste heat recovery device according to any one of claims 1 to 9.