CN215109101U

CN215109101U - Engine exhaust pipe

Info

Publication number: CN215109101U
Application number: CN202120210159.1U
Authority: CN
Inventors: 金栋; 魏天伟
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-12-10
Anticipated expiration: 2031-01-26

Abstract

The utility model provides an engine exhaust pipe. The exhaust pipe of the engine is provided with a three-way catalyst and a particle trap which are arranged at intervals along the direction of exhaust airflow, and a vacuum pipe section for connecting the three-way catalyst and the particle trap in series is arranged between the three-way catalyst and the particle trap; the vacuum pipe section is provided with an inner hole for the exhaust gas to pass through, and a vacuumized inner cavity arranged in the inner hole of the ring. The utility model discloses an engine exhaust pipe is favorable to three way catalyst converter and particle catcher to arrange the improvement of form particle catcher operating mode temperature down at the components of a whole that can function independently.

Description

Engine exhaust pipe

Technical Field

The utility model relates to an automobile parts technical field, in particular to engine exhaust pipe.

Background

When the gasoline engine runs, gasoline and air are mixed and combusted and then are not completely converted into CO₂And water, but rather contain a certain amount of pollutants, typically carbon monoxide (CO), Hydrocarbons (HC), Nitrogen Oxides (NO)_X) Particulate matter (PM/PN, P)Particulate Matter), and the like. In view of environmental protection and national requirements for automobile exhaust emission, the gasoline engine for vehicles needs to be equipped with an exhaust gas purification device, wherein a Three-Way-catalyst (TWC) is responsible for HC, CO and NO_XThe particle trap (GPF) removes carbon particles from the exhaust gas.

The trapped carbon particles within the GPF may grow as the engine ages while the carbon particles may be combusted to regenerate after the GPF reaches a certain temperature. The catalyst of the engine is close to the outlet of the supercharger, and the catalyst can be rapidly ignited so as to meet the emission requirement of the engine in the cold stage. The TWC and the GPF are generally recommended to be tightly coupled and packaged, so that the temperature in the GPF is high, and the GPF can realize passive regeneration under a certain load of an engine. However, the TWC and GPF tightly coupled packaging space is large in volume, and is difficult to realize due to the space limitation of an engine cabin.

Therefore, in actual use, the TWC and the GPF are often in a split arrangement mode and are communicated through a pipeline, so that the degree of freedom of arrangement is improved, and the design of the whole vehicle is facilitated. And when GPF and TWC are far away from each other, heat loss is large, GPF temperature is low, and exhaust pressure loss is increased after carbon is accumulated in GPF to a certain degree, so that vehicle power output is influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an engine exhaust pipe to do benefit to three way catalyst converter and particle trap and arrange the improvement of form particle trap operating mode temperature under the components of a whole that can function independently.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides an engine exhaust pipe, along exhaust gas flow direction, in be equipped with three way catalyst converter and the particle trap of interval arrangement on the engine exhaust pipe, and in three way catalyst converter with be equipped with between the particle trap in order concatenating vacuum pipe section between them, just the vacuum pipe section has in order to supply the hole that exhaust gas flow passes through, and the ring the vacuum inner chamber by the evacuation that the hole set up.

Further, a front oxygen sensor mounting port and a rear oxygen sensor mounting port which are arranged adjacent to the three-way catalyst are respectively arranged upstream and downstream of the three-way catalyst.

Further, a temperature sensor mounting opening is arranged at the upstream of the particle catcher and is adjacent to the particle catcher.

Furthermore, a differential pressure sensor gas taking pipe arranged adjacent to the particle catcher is respectively arranged at the upstream and the downstream of the particle catcher.

Furthermore, a vehicle body connecting part used for being connected with a vehicle body is arranged on the particle catcher.

Furthermore, the vehicle body connecting part is a hook fixedly connected to the particle catcher.

Furthermore, a flange used for connecting an exhaust silencer pipeline is arranged at the tail end of the engine exhaust pipe.

Furthermore, the vacuum pipe section is in a straight pipe shape, and the vacuum pipe section is connected with the three-way catalyst in series through a bent connecting pipe section.

Furthermore, an elastically deformable buffer pipe section is connected in series between the vacuum pipe section and the three-way catalyst.

Furthermore, the buffer pipe section adopts a corrugated pipe.

Compared with the prior art, the utility model discloses following advantage has:

engine exhaust pipe, use the vacuum pipe section as the connecting line between three way catalyst converter and the particle trap, when realizing that distribution between three way catalyst converter and particle trap is arranged the form, reduced the calorific loss that the vacuum pipe section produced, do benefit to the improvement of particle trap operating mode temperature to help the passive regeneration of carbon granule in the particle trap.

Meanwhile, the vacuum pipe section adopts a straight pipe form, and the communicated connecting pipe section is facilitated to realize bending arrangement, so that the whole arrangement of the engine exhaust pipe is facilitated, and the construction and processing of the vacuum pipe section are facilitated. And an elastically deformable buffer pipe section is additionally arranged between the three-way catalyst and the vacuum pipe section so as to adapt to relative offset between the three-way catalyst and the particle catcher generated by vibration of a vehicle and reduce the occurrence of damage to an engine exhaust pipe.

Drawings

The accompanying drawings, which form a part of the present disclosure, are provided to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions thereof are provided to explain the present disclosure, wherein the related terms in the front, back, up, down, and the like are only used to represent relative positional relationships, and do not constitute an undue limitation of the present disclosure. In the drawings:

FIG. 1 is a schematic view illustrating the treatment and emission of exhaust gas in an exhaust pipe of an engine according to an embodiment of the present invention;

fig. 2 is a schematic view of an overall structure of an engine exhaust pipe according to an embodiment of the present invention;

fig. 3 is an exemplary schematic diagram of a cross-sectional structure of a vacuum pipe section according to an embodiment of the present invention;

description of reference numerals:

1. a three-way catalyst; 101. a front oxygen sensor mounting port; 102. a rear oxygen sensor mounting port;

2. connecting the pipe sections; 20. a buffer pipe section;

3. a vacuum pipe section; 30. an inner bore; 300. a vacuum cavity;

4. a particle trap; 400. a temperature sensor mounting port; 401. a differential pressure sensor air intake pipe; 402. hooking; 403. and (4) a flange.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the appearances of the terms first, second, etc. in the figures are also for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless expressly limited otherwise. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to an engine exhaust pipe, which can improve the working condition temperature of a three-way catalyst and a particle trap in a split arrangement mode, thereby being beneficial to the passive regeneration of the particle trap.

On the engine exhaust pipe, a three-way catalyst and a particulate trap are disposed at intervals along the flow direction of exhaust gas. The vacuum pipe section is arranged between the three-way catalyst and the particle catcher and is connected in series with the three-way catalyst and the particle catcher, and the vacuum pipe section is provided with an inner hole for exhaust airflow to pass through and a vacuumized inner cavity arranged in the inner hole of the ring.

Based on the above design concept, an exemplary principle of the engine exhaust pipe of the present embodiment is shown in fig. 1, and an exemplary structure thereof is shown in fig. 2.

In the running process of the automobile engine, outside air enters from the air inlet pipe, enters the engine after passing through the air inlet intercooler and the air inlet manifold, and is mixed with fuel oil for combustion, so that the running of the engine is realized.

The exhaust gas from the engine enters the engine exhaust pipe after passing through the turbocharger, and the engine exhaust pipe of the embodiment is shown as a part in a dashed box in fig. 1. Along the air flow direction of the exhaust gas, the exhaust pipeline is sequentially connected with the air inlet pipe and the air outlet pipeA three-way catalyst 1 and a particulate trap 4 are provided to remove carbon monoxide (CO), Hydrocarbons (HC), Nitrogen Oxides (NO) from automobile exhaust_X) And particulate matter (PM/PN), etc., so that the exhaust gas meets the requirements of exhaust emission standards.

Because the carbon particles in the particle catcher 4 generally need to be regenerated ideally at a working temperature of about 700 ℃, the problem of carbon deposit blockage in the particle catcher 4 is reduced. In a real vehicle, the three-way catalyst 1 and the particulate trap 4 need to be arranged in a split manner in consideration of the space condition of the vehicle, and a communicated pipeline is additionally arranged between the three-way catalyst 1 and the particulate trap 4, so that the temperature of the particulate trap 4 is reduced, and the passive regeneration condition is difficult to meet.

Therefore, the vacuum pipe section 3 is used for realizing the connection and extension between the three-way catalyst 1 and the particle catcher 4, and the vacuum heat preservation effect of the vacuum pipe section 3 is utilized to ensure that the tail gas passing through the vacuum pipe section 3 is still in a higher temperature state, thereby realizing the good passive regeneration effect of the particle catcher 4. As shown in fig. 3, the exhaust gas flows through the inner hole 30, and the peripheral vacuum chamber 300 is in a vacuum state, so that a good heat insulation effect can be formed on the gas in the inner hole 30, and the heat loss on the pipeline between the three-way catalyst 1 and the particle trap 4 is greatly reduced.

Herein, the vacuum pipe section 3 may take a curved shape, but in consideration of the difficulty in constructing and processing the vacuum pipe section 3, it is preferable that the vacuum pipe section 3 takes a straight pipe-like form, and at the same time, the vacuum pipe section 3 is connected in series with the three-way catalyst 1 through the curved connection pipe section 2. Therefore, the bending arrangement of the connecting pipe section 2 is facilitated, and the overall arrangement of the engine exhaust pipe is more flexible; moreover, the structural processing of the vacuum pipe section 3 can be facilitated. Further, an elastically deformable buffer pipe section 20 is connected in series between the vacuum pipe section 3 and the three-way catalyst 1, and the buffer pipe section 20 is preferably a bellows. An elastically deformable buffer pipe section 20 is additionally arranged between the three-way catalyst 1 and the vacuum pipe section 3 to adapt to relative offset between the three-way catalyst 1 and the particle catcher 4 generated by vibration of a vehicle, so that the damage of an engine exhaust pipe can be reduced.

As shown in fig. 2, a front oxygen sensor mounting port 101 and a rear oxygen sensor mounting port 102, which are disposed adjacent to the three-way catalyst 1, are provided upstream and downstream of the three-way catalyst 1, respectively. In this way, a mounting site for facilitating the mounting of the oxygen sensor is formed, so that the detection of the exhaust gas treatment performance of the three-way catalyst 1 can be made. Likewise, a temperature sensor mounting opening 400 is provided upstream of the particle trap 4, which opening is arranged adjacent to the particle trap 4, for the mounting of a temperature sensor, so that a detection of the operating temperature of the particle trap 4 can be established. Thus, when the temperature of the particle catcher 4 is low and passive regeneration cannot be realized, and the pressure difference between the upstream and the downstream of the particle catcher 4 is too large and carbon deposition is likely to be generated to a certain extent, the ECU (electronic control unit) can be used for controlling the high-load operation of the engine so as to increase the temperature in the particle catcher 4, thereby realizing active GPF regeneration.

In order to facilitate the installation of the differential pressure sensor, a differential pressure sensor intake pipe 401 arranged adjacent to the particle trap 4 is provided upstream and downstream of the particle trap 4, respectively. Through installing differential pressure sensor to detect the pressure differential condition at both ends around the particle catcher 4, can in time judge the obstructed condition of particle catcher 4.

As is also shown in fig. 2, a body connection for connection to a vehicle body is provided on the particle catcher 4. The body attachment may be in the form of a mounting bracket, mounting hole, etc., and in this embodiment is a hook 402 that is fixedly attached to the particle catcher 4. The exhaust pipe of the engine can be conveniently assembled and fixed at the bottom of the vehicle by arranging the hook 402 on the particle catcher 4.

Further, a flange 403 is provided at the end of the engine exhaust pipe for attachment to a piping member such as an exhaust muffler pipe. Therefore, the installation and connection of the exhaust silencer, the rear-stage catalyst and other components at the tail part of the tail gas emission pipeline are more convenient and stable.

The engine exhaust pipe of this embodiment uses vacuum pipe section 3 as the connecting line between three way catalyst 1 and particle trap 4, when realizing the distribution arrangement form of three way catalyst 1 and particle trap 4, has reduced the heat loss that vacuum pipe section 3 produced, does benefit to the improvement of particle trap 4 operating mode temperature to help the passive regeneration of carbon granule in particle trap 4.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine exhaust pipe characterized in that: along the exhaust gas flow direction, in be equipped with three way catalyst converter (1) and particle trap (4) that the interval was arranged on the engine exhaust pipe, and in three way catalyst converter (1) with be equipped with between particle trap (4) in order to concatenate vacuum pipe section (3) between them, just vacuum pipe section (3) have for the confession exhaust gas flow passes through hole (30), and the ring vacuum inner chamber (300) by the evacuation that hole (30) set up.

2. The engine exhaust pipe according to claim 1, characterized in that: a front oxygen sensor mounting port (101) and a rear oxygen sensor mounting port (102) which are arranged adjacent to the three-way catalyst (1) are respectively arranged at the upstream and downstream of the three-way catalyst (1).

3. The engine exhaust pipe according to claim 1, characterized in that: a temperature sensor mounting opening (400) arranged adjacent to the particle catcher (4) is provided upstream of the particle catcher (4).

4. The engine exhaust pipe according to claim 1, characterized in that: a differential pressure sensor gas intake pipe (401) arranged adjacent to the particle catcher (4) is respectively arranged at the upstream and the downstream of the particle catcher (4).

5. The engine exhaust pipe according to claim 1, characterized in that: the particle catcher (4) is provided with a vehicle body connecting part for connecting with a vehicle body.

6. The engine exhaust pipe according to claim 5, characterized in that: the vehicle body connecting part is a hook (402) fixedly connected to the particle catcher (4).

7. The engine exhaust pipe according to claim 1, characterized in that: and a flange (403) used for connecting an exhaust silencer pipeline is arranged at the tail end of the engine exhaust pipe.

8. The engine exhaust pipe according to claim 1, characterized in that: the vacuum pipe section (3) is in a straight pipe shape, and the vacuum pipe section (3) is connected with the three-way catalyst (1) in series through a bent connecting pipe section (2).

9. The engine exhaust pipe according to any one of claims 1 to 8, characterized in that: an elastically deformable buffer pipe section (20) is connected in series between the vacuum pipe section (3) and the three-way catalyst (1).

10. The engine exhaust pipe according to claim 9, characterized in that: the buffer pipe section (20) adopts a corrugated pipe.