CN218266129U

CN218266129U - Engine exhaust system and vehicle

Info

Publication number: CN218266129U
Application number: CN202222622483.1U
Authority: CN
Inventors: 曹学涛
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-01-10
Anticipated expiration: 2032-09-30

Abstract

The utility model provides an engine exhaust system and vehicle, the utility model discloses an engine exhaust system, including exhaust route and the exhaust circulation route that sets up with exhaust route in parallel, the last series connection of exhaust circulation route is provided with cooling unit, and this engine exhaust system still includes water absorption unit, air conveying pipeline, heating unit and drain line, and wherein, water absorption unit series connection sets up on exhaust circulation route to be located the low reaches of cooling unit, in order to constitute the absorption to the condensate water in the exhaust circulation route; the air delivery pipeline delivers air flow to the water absorption unit, and the heating unit heats the water absorption unit. The utility model discloses an engine exhaust system through being provided with the unit that absorbs water, can realize the absorption to condensate water in the tail gas circulation route, and through being provided with air delivery pipeline and heating unit, can dry the unit that absorbs water to realize cleaing away of condensate water in the tail gas circulation route, do benefit to the used circulation of the unit that absorbs water.

Description

Engine exhaust system and vehicle

Technical Field

The utility model relates to the technical field of automobile exhaust emission, in particular to an engine exhaust system; and simultaneously, the utility model discloses still relate to a dispose vehicle of this engine exhaust system.

Background

In recent years, global warming and greenhouse effect are more severe, and in order to meet the situation, higher requirements on the limit value of pollutants discharged by automobiles are put forward in various countries. Exhaust gas recirculation systems are used as a primary means of controlling nitrogen oxide emissions, often as a primary technique for treating nitrogen oxide emissions from internal combustion engines.

Exhaust Gas Recirculation (EGR) is a technique of separating a part of Exhaust Gas after combustion in an internal combustion engine, introducing the separated Exhaust Gas into an intake side, and burning the Exhaust Gas again. Because the oxygen content in the tail gas is very low and mainly comprises nitrogen and carbon dioxide, a part of tail gas flows back to the air inlet system to be mixed with air, so that the oxygen concentration in the mixed gas is low, the combustion speed is reduced, and the specific heat capacity of the mixed gas is improved, thereby effectively inhibiting the generation of nitrogen oxides.

In the prior art, a cooling device is often arranged in the tail gas circulation pipeline, so that the use effect of the waste gas recirculation system is improved. However, as the exhaust gas cools, the water vapor in the exhaust gas will gradually condense into condensed water, and this condensed water, if flowing to the impeller of the turbocharger along with the mixed gas flow, may damage the impeller operating at high speed, affect the performance of the turbocharger and even cause damage to the turbocharger. If the condensed water flows into the cylinder of the engine, the engine is easy to fire, and the lubricating oil film in the cylinder is damaged, so that the cylinder is pulled.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to an engine exhaust system, which is favorable for removing condensed water in an exhaust gas circulation path.

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

an engine exhaust system, includes exhaust passage and with the exhaust passage parallelly connected exhaust circulation route that sets up, the last series connection of exhaust circulation route is provided with cooling unit, and this engine exhaust system still includes:

the water absorption unit is arranged on the tail gas circulation passage in series and is positioned at the downstream of the cooling unit, and the water absorption unit is used for absorbing condensed water in the tail gas circulation passage;

the air delivery pipeline is communicated and controllably connected to the air inlet side of the water absorption unit and delivers air flow to the water absorption unit;

the heating unit is connected with the water absorption unit and is powered by a power supply to heat the water absorption unit;

the drainage pipeline is communicated and controllably connected with the exhaust side of the water absorption unit;

the condensed water adsorbed in the water absorption unit is heated into water vapor by the heating unit, and the air flow and the water vapor which are conveyed to the water absorption unit are discharged through the drainage pipeline.

Further, the turbocharger is arranged on the exhaust passage in series, and is provided with a gas compressor connected to the upstream of the engine and a turbine connected to the downstream of the engine.

Further, the air delivery pipeline is connected to the air inlet side of the water absorption unit and the air exhaust side of the air compressor.

Furthermore, a first control valve is arranged on the air delivery pipeline.

Further, a second control valve and a third control valve are respectively arranged in the exhaust gas circulation passage at the upstream of the cooling unit and the downstream of the water absorption unit; and a fourth control valve is arranged on the water discharge pipeline.

Further, the control device further comprises a controller, wherein the controller controls the first control valve, the second control valve, the third control valve and the fourth control valve to be opened and closed.

Further, the heating unit is provided as an electric heater connected to the water absorbing unit.

Furthermore, the water absorption unit comprises a shell and an adsorption medium filled in the shell, wherein an airflow channel which penetrates through the adsorption medium along the axial direction of the adsorption medium is formed on the adsorption medium.

Furthermore, the device also comprises a humidity detection unit, wherein the humidity detection unit is provided with a sensing probe embedded in the adsorption medium.

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

the utility model discloses an engine exhaust system through being provided with the unit that absorbs water, can realize the absorption to condensate water in the exhaust gas circulation route, and through being provided with air delivery pipeline and heating unit, can dry the unit that absorbs water to realize cleaing away of condensate water in the exhaust gas circulation route, do benefit to the used circulation of the unit that absorbs water.

In addition, the controller and the control valves are arranged, so that whether the tail gas circulation passage and the air conveying pipeline work or not can be conveniently controlled.

In addition, the humidity detection unit is arranged, so that the humidity of the adsorption medium can be detected, and the air conveying pipeline is opened in time to dry the adsorption medium after the adsorption medium is saturated.

And simultaneously, the utility model also provides a vehicle, be equipped with as above on the vehicle engine exhaust system.

The utility model discloses a vehicle, through being provided with as above engine exhaust system, be convenient for realize being favorable to promoting vehicle job stabilization nature and security to cleaing away of condensate water in the exhaust gas circulation route.

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 diagram of an overall structure of an engine exhaust system according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a flow path of airflow in the exhaust passage and the exhaust gas circulation passage according to an embodiment of the present invention;

fig. 3 is a schematic diagram of the exhaust passage and the flow paths of the airflows in the air delivery pipeline and the water discharge pipeline according to the embodiment of the present invention;

fig. 4 is a schematic structural view of a water absorption unit according to an embodiment of the present invention.

Description of reference numerals:

1. an exhaust passage; 2. an exhaust gas circulation path; 3. an air cleaner; 4. a turbocharger; 401. a gas compressor; 402. a turbine; 5. an intercooling heat dissipation module; 6. an engine; 7. a post-processor; 8. a muffler; 9. a cooling unit; 10. a water absorbing unit; 1001. a housing; 1002. an adsorbent media; 1003. an air flow channel; 11. a wind delivery pipeline; 12. a drain line; 13. a controller; 14. a sensing probe; 15. a first control valve; 16. a second control valve; 17. a third control valve; 18. a fourth control valve; 19. a heating unit.

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", "outer", 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. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same order, but are to be construed as referring to the same order.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in conjunction with the specific situation for a person of ordinary skill in the art.

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

Example one

The embodiment relates to an engine exhaust system, which comprises an exhaust passage 1 and an exhaust gas circulation passage 2 connected with the exhaust passage 1 in parallel, wherein a cooling unit 9 is connected on the exhaust gas circulation passage 2 in series, and the engine exhaust system further comprises a water absorption unit 10, an air delivery pipeline 11, a heating unit 19 and a water drainage pipeline 12.

The water absorption unit 10 is arranged in series on the exhaust gas circulation path 2 and is located at the downstream of the cooling unit 9 to absorb the condensed water in the exhaust gas circulation path 2. The air delivery pipeline 11 is connected with the air inlet side of the water absorption unit 10 in a conduction and controllable mode, and delivers air flow into the water absorption unit 10. The heating unit 19 is connected to the water absorbing unit 10 and configured to heat the water absorbing unit 10 after being supplied with power via a power supply. The drain line 12 is connected to the exhaust side of the water suction unit 10 in a conduction-controllable manner. The condensed water adsorbed in the water absorption unit 10 is heated to steam by the heating unit 19, and the generated steam and the air flow sent into the water absorption unit 10 are discharged through the drain line 12. Through the arrangement, the condensed water in the tail gas circulation passage 2 can be conveniently removed, and the water absorption unit 10 can be conveniently recycled.

As a preferred embodiment, as shown in fig. 1 to 3, an air cleaner 3, a turbocharger 4, an intercooler module 5, an engine 6, an aftertreatment device 7, and a muffler 8 are provided in this order on an exhaust passage 1 in the direction of flow of gas in the exhaust passage 1. The turbocharger 4 provided in series in the exhaust passage 1 includes a gas compressor 401 connected upstream of the engine 6 and a turbine 402 connected downstream of the engine 6. In a specific embodiment, the intake side of the air compressor 401 is connected to the exhaust side of the air cleaner 3, and the exhaust side of the air compressor 401 is connected to the intake side of the intercooling and heat dissipating module 5. The intake side of the turbine 402 is connected to the exhaust side of the engine 6, and the exhaust side of the turbine 402 is communicated with the intake side of the aftertreatment processor 7.

Further, as shown in fig. 1, in the present embodiment, the intake side of the exhaust gas circulation path 2 is connected to the exhaust side of the aftertreatment unit 7, and the exhaust side of the exhaust gas circulation path 2 is connected to the exhaust side of the air cleaner 3, so that a part of the exhaust gas is branched off and flows into the exhaust gas circulation path 2, and flows through the exhaust gas circulation path 2 to be mixed with the air newly entering the exhaust gas circulation path 1. In the exhaust gas circulation passage 2, a cooling unit 9 and a water absorbing unit 10 are provided in this order in the flow direction of the gas flow.

It should be noted that the air cleaner 3, the turbocharger 4, the intercooling heat dissipation module 5, the engine 6, the aftertreatment device 7, the muffler 8, and the like mentioned in the present embodiment may all adopt devices commonly used in the prior art, for example, the intercooling heat dissipation module 5 may be an intercooler commonly used in the prior art, and in addition, the aftertreatment device 7 may be a catalyst, a particulate trap, and the like commonly used in the prior art. In addition, the cooling unit 9 in the present embodiment may be a cooler for cooling fluid, which is commonly used in the art.

As also shown in fig. 1, the air delivery line 11 connects the intake side of the water suction unit 10 and the exhaust side of the air compressor 401. In this way, the air pressurized by the air compressor 401 can be introduced into the water absorption unit 10 to blow out the water vapor generated by the water absorption unit 10 after heating.

In addition, in the present embodiment, the heating unit 19 is provided as an electric heater connected to the water absorption unit 10, so that after the electric heater is powered on, the water absorption unit 10 can be heated, the condensed water adsorbed by the water absorption unit 10 can be heated into water vapor, and the generated water vapor can be discharged through the drain pipeline 12, thereby facilitating the recycling of the water absorption unit 10. The electric heater in this embodiment may be connected to the vehicle's power system so that the electric heater is powered by the vehicle's power system.

In order to control the conduction of the air transportation pipeline 11 conveniently, a first control valve 15 is arranged on the air transportation pipeline 11. Further, as also shown in fig. 1, in the present embodiment, a second control valve 16 and a third control valve 17 are provided in the exhaust gas circulation passage 2 upstream of the cooling unit 9 and downstream of the water absorbing unit 10, respectively, and a fourth control valve 18 is provided on the drain line 12. The conduction of the exhaust gas circulation passage 2 can be controlled by providing the second control valve 16 and the third control valve 17. By providing the fourth control valve 18, the conduction of the drain line 12 can be controlled. In addition, each control valve in the present embodiment may be a solenoid valve commonly used in the art.

In addition, in order to facilitate the control of the opening and closing of each valve body, a controller 13 is further provided in the present embodiment, and the controller 13 is connected to the first control valve 15, the second control valve 16, the third control valve 17, and the fourth control valve 18, respectively, so as to control the opening and closing of each valve body. The controller 13 in this embodiment may be a control device commonly used in the prior art and separately provided on the vehicle, such as a PLC, etc., or may be a control device provided on the vehicle, such as an ECU (electronic control unit), etc. And the controller 13 and each control valve may be powered by the vehicle power system.

As shown in fig. 4, in this embodiment, the water absorbing unit 10 includes a housing 1001, and an adsorption medium 1002 filled in the housing 1001, and the adsorption medium 1002 is formed with an airflow channel 1003 extending through the adsorption medium 1002 in an axial direction thereof. During the concrete implementation, casing 1001 can be the pipe form, and adsorption medium 1002 can be cylindricly, and adsorption medium 1002 is the aluminium silicate cotton that commonly uses among the prior art, and it still has good high temperature resistance performance when having excellent water absorption performance, so, when being convenient for realize the absorption to the comdenstion water, in the in-process that high temperature air current heated the comdenstion water for vapor, also can not cause adsorption medium 1002's damage. Of course, the use of the silicic acid filter cotton as the adsorption medium 1002 is only an excellent embodiment, and in addition, materials with good water absorption and high temperature resistance commonly used in the prior art may be used.

In addition, in the present embodiment, the engine exhaust system further includes a humidity detection unit, and the humidity detection unit has the sensing probe 14 embedded in the adsorption medium 1002 to detect the humidity of the adsorption medium 1002. In specific implementation, as shown in fig. 4, the sensing probe 14 may be embedded in the adsorption medium 1002 at a position above the airflow channel 1003 and near the middle of the adsorption medium 1002, so as to achieve a better detection effect. In addition, the humidity detection unit in the present embodiment may be a moisture meter commonly used in the prior art.

In the exhaust system of the present embodiment, when the exhaust passage 1 is operated, the second control valve 16 and the third control valve 17 may be opened and the first control valve 15 and the fourth control valve 18 may be closed at the same time as the exhaust passage 1 is operated, as shown in fig. 2 and a in fig. 3, so that the exhaust gas circulation passage 2 may be operated to return part of the exhaust gas to the intake system, thereby reducing the generation of nitrogen oxides during the operation of the engine 6. The flow path of the gas stream in the off-gas circulation path 2 is shown as B in fig. 2.

Since the cooling unit 9 is disposed in the exhaust gas circulation path 2 to cool the returned exhaust gas, the water vapor in the exhaust gas gradually condenses into condensed water, and the water absorption unit 10 is disposed to absorb the condensed water in the exhaust gas circulation path 2. In the using process, a critical value of the humidity of the adsorption medium 1002 can be preset, when the humidity detected by the humidity detecting unit reaches the critical value, the second control valve 16 and the third control valve 17 are closed, the heating unit 19 is started to heat the water absorbing unit 10, so that the condensed water adsorbed by the water absorbing unit 10 is heated into water vapor, and meanwhile, the first control valve 15 and the fourth control valve 18 are opened, so that the air delivery pipeline 11 can be operated, the generated water vapor is blown out to the outside air through the water discharge pipeline 12, and the flow path of the air in the process is shown as C in fig. 3.

The engine exhaust system of this embodiment, through being provided with the unit 10 that absorbs water, can realize the absorption to the condensate water in exhaust gas circulation route 2, and through being provided with air conveying pipeline 11 and heating element 19, can dry to the unit 10 that absorbs water to realize the clearance of condensate water in exhaust gas circulation route 2, and do benefit to the used as a whole of the unit 10 that absorbs water.

Example two

The present embodiment relates to a vehicle provided with an engine exhaust system according to the first embodiment.

The vehicle of this embodiment through being provided with the engine exhaust system in the embodiment one, is convenient for realize the cleaing away of condensate water in the tail gas circulation route 2, is favorable to promoting vehicle job stabilization nature and security.

The above description is only for the 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 system, includes exhaust route (1) and with exhaust route (1) parallelly connected exhaust circulation route (2) that sets up, be provided with cooling unit (9) on exhaust circulation route (2) the series connection, characterized by, this engine exhaust system still includes:

the water absorption unit (10) is arranged on the tail gas circulation passage (2) in series and is positioned at the downstream of the cooling unit (9) so as to absorb the condensed water in the tail gas circulation passage (2);

the air delivery pipeline (11) is connected to the air inlet side of the water absorption unit (10) in a conduction and controllable mode and delivers air flow to the water absorption unit (10);

the heating unit (19) is connected with the water absorption unit (10), and the heating unit (19) heats the water absorption unit (10) after power is supplied by a power supply;

a drainage pipeline (12) which is connected with the exhaust side of the water absorption unit (10) in a conduction and controllable manner;

the condensed water adsorbed in the water absorption unit (10) is heated by the heating unit (19) into water vapor, and the water vapor and the air flow sent into the water absorption unit (10) are discharged through the drain line (12).

2. The engine exhaust system according to claim 1, further comprising:

and a turbocharger (4) that is provided in series on the exhaust passage (1), the turbocharger (4) having a gas compressor (401) connected upstream of an engine (6) and a turbine (402) connected downstream of the engine (6).

3. The engine exhaust system according to claim 2, wherein:

the air delivery pipeline (11) is connected to the air inlet side of the water absorption unit (10) and the air exhaust side of the air compressor (401).

4. The engine exhaust system according to claim 3, wherein:

and a first control valve (15) is arranged on the air conveying pipeline (11).

5. The engine exhaust system according to claim 4, wherein:

a second control valve (16) and a third control valve (17) are respectively arranged on the upstream of the cooling unit (9) and the downstream of the water absorption unit (10) in the tail gas circulation passage (2);

and a fourth control valve (18) is arranged on the drainage pipeline (12).

6. The engine exhaust system according to claim 5, further comprising:

a controller (13), wherein the controller (13) controls the opening and closing of the first control valve (15), the second control valve (16), the third control valve (17), and the fourth control valve (18).

7. The engine exhaust system according to claim 1, characterized in that:

the heating unit (19) is provided as an electric heater connected to the water absorption unit (10).

8. The engine exhaust system according to any one of claims 1 to 7, characterized in that:

the water absorption unit (10) comprises a shell (1001) and an adsorption medium (1002) filled in the shell (1001), wherein an airflow channel (1003) penetrating through the adsorption medium (1002) along the axial direction of the adsorption medium is formed on the adsorption medium (1002).

9. The engine exhaust system according to claim 8, further comprising:

a humidity detection unit having a sensing probe (14) embedded in the adsorption medium (1002).

10. A vehicle, characterized in that:

the vehicle is provided with an engine exhaust system according to any one of claims 1 to 9.