CN218266127U

CN218266127U - Engine exhaust system and vehicle

Info

Publication number: CN218266127U
Application number: CN202222620852.3U
Authority: CN
Inventors: 曹学涛; 乔东旭; 李宗�
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 air flow delivered by the air delivery pipeline. 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 technology for internal combustion engines to treat nitrogen oxide emissions.

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, after the exhaust gas is cooled to below 100 ℃, the water vapor in the exhaust gas is gradually condensed into condensed water, and if the condensed water flows to the impeller of the turbocharger along with the mixed gas flow, the condensed water can damage the impeller which runs at a high speed, and the performance of the turbocharger is affected and even the turbocharger is damaged. 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 provides an engine exhaust system to facilitate removal of condensed water in an exhaust gas circulation path.

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

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 so as to absorb the 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 air conveying pipeline and heats the air flow conveyed by the air conveying pipeline;

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

the condensed water absorbed in the water absorption unit is conveyed to the air flow in the water absorption unit to be heated into water vapor, and the air flow and the water vapor are discharged through the drainage pipeline.

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

Further, the heating unit is provided as a heat transfer element connected downstream of the wind delivery line and the turbine.

Furthermore, the air delivery pipeline comprises a first air delivery pipeline and a second air delivery pipeline which are connected, and the heat dissipation end is connected to the position where the first air delivery pipeline is connected with the second air delivery pipeline.

Furthermore, a first control valve and a second control valve are respectively arranged on the first air delivery pipeline and the second air delivery pipeline.

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

The controller controls the first control valve, the second control valve, the third control valve, the fourth control valve and the fifth control valve to open and close.

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 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.

In addition, the heating unit adopts the heat pipe assembly, and the heat absorption end of the heat pipe assembly is connected to the downstream of the turbine, so that the air flow conveyed in the air conveying pipeline can be heated conveniently, an external power supply is not needed, and the energy consumption is reduced.

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.

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 further understand the present disclosure, and the exemplary embodiments and descriptions thereof are used to explain the present disclosure, wherein the related front and back, upper and lower, and other words are only used to represent relative positional relationships, which do not constitute an improper 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 an air flow in an exhaust passage and an exhaust gas circulation passage according to an embodiment of the present invention;

fig. 3 is a schematic view of the flow paths of the air flows in the exhaust passage and in the air delivery pipeline and the drainage 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; 1101. a first air delivery pipeline; 1102. a second air 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 fifth control valve; 20. a heating unit; 2001. a heat absorption end; 2002. and a heat dissipation end.

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 item, but are to be construed as indicating or implying any particular importance.

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. 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.

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 20 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 20 is connected to the air delivery pipe 11 and heats the air flow delivered by the air delivery pipe 11. The drainage pipeline 12 is connected to the exhaust side of the water absorption unit 10 in a conduction-controllable manner, the condensed water absorbed in the water absorption unit 10 is heated to be water vapor by the air flow conveyed into the water absorption unit 10, and the air flow and the water vapor in the water absorption unit 10 are discharged through the drainage pipeline 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. In addition, considering that the water absorbed in the water absorption unit 10 may be condensed into ice when the vehicle is used in winter, which affects the normal use of the water absorption unit 10, the above arrangement is also favorable for melting the ice layer in the water absorption unit 10, and the melted ice layer can be heated into water vapor and discharged from the water discharge pipeline 12.

As a preferred embodiment, as shown in fig. 1 to 3, in the present embodiment, 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 the exhaust passage 1 in this order along the flow direction of the 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 heat dissipation 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 communicates 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, and the air flow conveyed by the air conveying pipeline 11 is heated by the heating unit 20 in the flowing process, so that the temperature of the air flow is increased, and the water absorption unit 10 can be dried after the air flow enters the water absorption unit 10.

The heating unit 20 is provided as a heat conducting element and is connected downstream of the wind pipeline 11 and the turbine 402. Preferably, as shown in fig. 1, in the present embodiment, the heat conduction element is connected between the air duct 11 and the exhaust side of the turbine 402, so that the heat of the gas exhausted from the turbine 402 can be transmitted to the air duct 11, and the air flow conveyed in the air duct 11 can be heated.

As a preferred embodiment, the heat transfer element in this embodiment employs a heat pipe assembly having a heat dissipating end 2002 connected to the air delivery conduit 11 and a heat absorbing end 2001 connected downstream of the turbine 402. By using the heat pipe assembly as the heat conduction element, a good heat conduction effect is facilitated, and the heating of the air flow conveyed in the air delivery pipeline 11 is facilitated. It should be noted that, the specific structure of the heat pipe assembly may be designed by referring to a heat pipe structure for heat conduction, which is common in the prior art, and is not described herein again.

As shown in fig. 1, in the present embodiment, the air delivery pipeline 11 includes a first air delivery pipeline 1101 and a second air delivery pipeline 1102 which are connected, and the heat dissipation end 2002 of the heat pipe assembly is connected at a position where the first air delivery pipeline 1101 and the second air delivery pipeline 1102 are connected. So, be convenient for make the heat pipe assembly heat the air current that air delivery pipeline 11 carried, also be favorable to preventing at the in-process of tail gas circulation route 2 work, the heat pipe assembly heats the air current that flows in tail gas circulation route 2 to influence tail gas circulation route 2's result of use.

In order to control the conduction of the air delivery pipeline 11, a first control valve 15 is provided on the first air delivery pipeline 1101, and a second control valve 16 is provided on the second air delivery pipeline 1102. Further, as also shown in fig. 1, in the present embodiment, a third control valve 17 and a fourth control valve 18 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 fifth control valve 19 is provided in the drain line 12. The third control valve 17 and the fourth control valve 18 are provided to control whether or not the exhaust gas circulation passage 2 is opened. By providing the fifth control valve 19, it is possible to control whether the drain line 12 is conducted or not. In addition, each control valve in the present embodiment may be a solenoid valve commonly used in the art.

In addition, in order to control 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, the fourth control valve 18, and the fifth control valve 19 to control the opening and closing thereof, respectively. In addition, the controller 13 in the present embodiment may be a control device commonly used in the prior art, such as a PLC, which is additionally provided on the vehicle, or may be a control device provided in the vehicle, such as an ECU (electronic control unit). And the controller 13 and the individual control valves 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 specific implementation, the shell 1001 can be in a circular tube shape, the adsorption medium 1002 can be in a cylindrical shape, and the adsorption medium 1002 can be aluminum silicate cotton commonly used in the prior art, and has excellent water absorption performance and good high temperature resistance, so that adsorption of condensed water is facilitated, and the adsorption medium 1002 cannot be damaged in the process that the condensed water is heated into water vapor by air flow conveyed by the air conveying pipeline 11. 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 embodiment, the engine exhaust system may further include 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 in operation, the flow path of the gas in the exhaust passage 1 may be opened and the first control valve 15, the second control valve 16, and the fifth control valve 19 may be closed while the third control valve 17 and the fourth control valve 18 are opened, as shown in fig. 2 and a in fig. 3, so that the exhaust gas circulation passage 2 is operated to return part of the exhaust gas to the intake system, thereby reducing the generation of nitrogen oxides in the engine 6 during operation. 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 passage 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 passage 2. In the using process, a critical value of the humidity of the adsorption medium 1002 can be preset, and when the humidity detected by the humidity detecting unit reaches the critical value, the third control valve 17 and the fourth control valve 18 are closed, and the first control valve 15, the second control valve 16 and the fifth control valve 19 are opened, so that the air conveying pipeline 11 and the water discharging pipeline 12 can be operated, the heating unit 20 can heat the air flow conveyed in the air conveying pipeline 11, only the adsorption medium 1002 is dried, the air flow conveyed into the water absorbing unit 10 through the air conveying pipeline 11 and the water vapor generated after heating are discharged to the outside air through the water discharging 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 absorbing the condensation water in exhaust gas circulation route 2, and through being provided with air delivery pipeline 11 and heating element 20, can dry to the unit 10 that absorbs water to realize the cleaing away of condensation water in exhaust gas circulation route 2, and do benefit to the used cyclically 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 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 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 (20) is connected with the air conveying pipeline (11) and heats the air flow conveyed by the air conveying pipeline (11);

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 absorbed in the water absorption unit (10) is heated into water vapor by the air flow conveyed to the water absorption unit (10), and the air flow and the water vapor are discharged through the drainage pipeline (12).

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

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

3. The engine exhaust system according to claim 2, characterized in that:

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 2, characterized in that:

the heating unit (20) is provided as a heat conducting element connected downstream of the wind conveying pipe (11) and the turbine (402).

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

the heat conducting element employs a heat pipe assembly having a heat dissipating end (2002) connected to the air delivery duct (11), and a heat absorbing end (2001) connected downstream of the turbine (402).

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

the air delivery pipeline (11) comprises a first air delivery pipeline (1101) and a second air delivery pipeline (1102) which are connected, and the heat dissipation end (2002) is connected to the position where the first air delivery pipeline (1101) is connected with the second air delivery pipeline (1102).

7. The engine exhaust system according to claim 6, wherein:

and a first control valve (15) and a second control valve (16) are respectively arranged on the first air conveying pipeline (1101) and the second air conveying pipeline (1102).

8. The engine exhaust system according to claim 7, wherein:

a third control valve (17) and a fourth control valve (18) 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 fifth control valve (19) is arranged on the drainage pipeline (12).

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

and a controller (13), wherein the controller (13) controls the first control valve (15), the second control valve (16), the third control valve (17), the fourth control valve (18) and the fifth control valve (19) to open and close.

10. A vehicle, characterized in that:

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