CN210289965U

CN210289965U - EGR exhaust gas system is got to in-line five jar diesel engine's single channel

Info

Publication number: CN210289965U
Application number: CN201921360195.5U
Authority: CN
Inventors: 李奇骅; 雷啸峰; 陶乐闽; 叶云展
Original assignee: Sinotruk Jinan Power Co Ltd
Current assignee: Sinotruk Jinan Power Co Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-04-10
Anticipated expiration: 2029-08-20

Abstract

The utility model relates to a diesel engine field especially relates to an EGR exhaust gas system is got to five jar diesel engine's of in-line single channel, when satisfying EGR rate needs, can balance the exhaust of five jar engines, makes turbocharger operation more steady. The single-channel EGR exhaust gas taking system of the in-line five-cylinder diesel engine comprises a first exhaust channel, a second exhaust channel, an EGR exhaust gas channel and a turbocharger, wherein the first exhaust channel (circulating three cylinder exhaust gas quantities) and the second exhaust channel (circulating two cylinder exhaust gas quantities) are respectively connected with two turbine channels of the turbocharger, and the EGR exhaust gas channel is connected with the first exhaust channel. The two turbine channels of the turbocharger have asymmetric flow key sectional areas (the minimum sectional areas of the turbine channels corresponding to the three cylinders are smaller, the back pressure is higher), EGR can be taken from the first exhaust channel, the uniformity of exhaust gas flow of each cylinder and the working stability of the turbocharger are ensured, and the performance of an engine is further ensured.

Description

EGR exhaust gas system is got to in-line five jar diesel engine's single channel

Technical Field

The utility model relates to a diesel engine field especially relates to an EGR exhaust gas system is got to five jar diesel engine's in-line single channel.

Background

An Exhaust Gas Recirculation (EGR) system is an EGR system that cools a portion of Exhaust Gas generated by a diesel engine or a gasoline engine and then returns the cooled Exhaust Gas to a cylinder. The recirculated exhaust gas will retard the combustion process due to its inertness, i.e. the combustion speed will be slowed down and the pressure build-up process in the combustion chamber will be slowed down, which is the main reason for the reduction of nitrogen oxides. In addition, increasing the exhaust gas recirculation rate reduces the total exhaust gas flow (mass flow) and therefore the total pollutant output in the exhaust gas emissions will be relatively reduced. The task of an EGR system is to optimize the amount of exhaust gas recirculation at each operating point, so that the combustion process is always optimal, and finally to ensure that the pollutant content of the emissions is minimal.

In-line five cylinder diesel engines are less common, but five cylinder engines can effectively avoid the natural frequencies of many systems, thereby avoiding resonance. However, since the number of cylinders of the five-cylinder engine is odd, a natural imbalance exists in the exhaust process, which affects the operation of the turbine of the turbocharger, and if the EGR gas taking structure is not reasonable, the effect is increased.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art's the aforesaid, the utility model provides an EGR exhaust gas system is got to in-line five cylinders diesel engine's single channel when guaranteeing to satisfy EGR rate needs, can balance the exhaust of engine, makes turbocharger's turbine's operation more steady.

The utility model provides a scheme as follows:

the utility model provides an EGR exhaust gas system is got to in-line five jar diesel engine's single channel, includes first exhaust passage, second exhaust passage, EGR exhaust passage and turbo charger, three cylinder of engine is connected to first exhaust passage one end, and turbo charger is connected to the other end, two cylinders of engine are connected to second exhaust passage one end, and turbo charger is connected to the other end, EGR exhaust passage and first exhaust passage are connected. When the five-cylinder engine works normally, the exhaust gas quantity of the three cylinders is more than that of the two cylinders, the exhaust back pressure is easier to build, a part of exhaust gas in the three cylinders conveniently flows to the EGR exhaust gas channel of the first exhaust channel, most of exhaust gas in the two cylinders enters the second exhaust channel, and therefore the uniformity of exhaust of each cylinder and the working stability of the turbocharger are guaranteed while the EGR rate is met, and the performance of the engine is further guaranteed.

Preferably, the amount of exhaust gas in the cavity of the first exhaust passage is larger than the amount of exhaust gas in the cavity of the second exhaust passage.

Preferably, the first exhaust passage is connected to the EGR exhaust passage near the turbocharger, the turbocharger includes a first turbine passage connected to the first exhaust passage and a second turbine passage connected to the second exhaust passage, and a minimum sectional area of the first turbine passage is smaller than a minimum sectional area of the second turbine passage. The exhaust gas flow rate of the inner cavity of the first exhaust passage is larger than that of the inner cavity of the second exhaust passage. Set up to turbo charger turbine passageway, through the different sectional area size that sets up first turbine passageway and second turbine passageway, establish the backpressure more easily in making first turbine passageway to can more effectual control first exhaust passage and second exhaust passage's gas flow and pressure, thereby realize comparatively ideal getting EGR rate.

Preferably, the turbocharger is an asymmetric turbocharger. Because the first exhaust passage and the second exhaust passage have different exhaust volumes, the asymmetric turbocharger can be driven more uniformly by exhaust gas.

Preferably, the first exhaust passage is connected with a first cylinder, a second cylinder and a fifth cylinder of the engine, and the second exhaust passage is connected with a third cylinder and a fourth cylinder of the engine. In consideration of the smoothness, the utility model discloses the ignition sequence of the five-cylinder engine of application is one, two, four, five, three, and corresponding three-cylinder passageway comprises first, two, five cylinder exhaust gas flow channels, and two jar passageways then comprise third, four cylinder exhaust gas flow channels.

Preferably, at least a part of the EGR exhaust passage is provided as a bellows. The corrugated pipe can make up processing and installation errors.

Preferably, the EGR exhaust passage is connected to a flow dividing device, the flow dividing device includes at least two exhaust gas outlets, and different exhaust gas outlets are respectively connected to the EGR cooler through pipelines. The shunting device changes the single channel into multiple channels, and the EGR waste gas enters the EGR cooler after shunting, so that the heat exchange efficiency of the EGR cooler can be improved.

An in-line five-cylinder diesel engine comprises the single-channel EGR taking exhaust system of the in-line five-cylinder diesel engine.

The utility model discloses following beneficial effect has:

1. the number of cylinders connected with the first exhaust passage and the second exhaust passage is different, and after the exhaust gas in the three-cylinder exhaust passage is taken away by the EGR, the three-cylinder exhaust passage is close to the flow of the exhaust gas in the two-cylinder exhaust passage, so that the flow of the exhaust gas entering the two exhaust passages in the volute of the supercharger is balanced; therefore, the stress of the turbine blades is more uniform, the waste gas flow of the two exhaust passages is balanced, the EGR rate is obtained, and meanwhile, the reliability of the turbocharger can be improved and the pumping loss can be reduced;

2. the EGR waste gas channel is arranged on the first exhaust channel, and the back pressure is established by the small-section-area channel of the asymmetric supercharger, so that the EGR gas taking is easier, and the sufficiency of the EGR flow can be ensured as far as possible.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a part of the structure of the present invention;

in the figure, 1-a first exhaust passage, 2-a second exhaust passage, 3-an EGR exhaust passage, 4-a turbocharger, 5-a first turbine passage, 6-a second turbine passage, 7-a bellows, and 8-a flow dividing device.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Example one

As shown in fig. 1 and fig. 2, the present embodiment provides a single-channel EGR exhaust gas taking system for an in-line five-cylinder diesel engine, which includes a first exhaust passage 1, a second exhaust passage 2, an EGR exhaust gas passage 3, and a turbocharger 4, wherein one end of the first exhaust passage 1 is connected to the turbocharger 4, the other end is connected to first, second, and fifth cylinders of the engine, one end of the second exhaust passage 2 is connected to the turbocharger 4, and the other end is connected to third and fourth cylinders of the engine.

The first exhaust passage 1 is connected to an EGR exhaust passage 3 near a connection turbocharger 4. The turbocharger 4 is an asymmetric turbocharger.

In this embodiment, the minimum cross-sectional area of the inner cavity of the first exhaust duct 1 is smaller than that of the second exhaust duct 2. The turbocharger 4 comprises a first turbine passage 5 and a second turbine passage 6, the first turbine passage 5 being connected to the first exhaust passage 1, the second turbine passage 6 being connected to the second exhaust passage 2, the minimum cross-sectional area 5 of the first turbine passage being smaller than the minimum cross-sectional area 6 of the second turbine passage.

At least a part of the EGR exhaust passage 3 is provided as a bellows 7.

The end of the EGR exhaust passage 3 is provided with a flow dividing device 8, the flow dividing device 8 comprises at least two exhaust gas outlets, and different exhaust gas outlets are respectively connected to the EGR cooler through pipelines. The flow dividing device 8 can be a double-valve body EGR valve, and the internal channel structure is a single channel-to-double channel structure.

The utility model discloses the theory of operation as follows:

when five cylinders of the inline five-cylinder diesel engine are operated, exhaust gas of the first, second, and fifth cylinders is discharged to the turbocharger 4 through the first exhaust passage 1, and exhaust gas of the third, and fourth cylinders is discharged to the turbocharger 4 through the second exhaust passage 2. Since the minimum cross-sectional area 5 of the first turbo passage of the turbocharger 4 is smaller than the minimum cross-sectional area 6 of the second turbo passage, back pressure is established in the first turbo passage 5, EGR exhaust gas can smoothly enter the EGR exhaust passage 3, and EGR exhaust gas circulation can be performed. The number of cylinders connected with the first exhaust passage 1 and the second exhaust passage 2 is different, and after the exhaust gas of the three-cylinder exhaust passage is taken away by EGR, the three-cylinder exhaust passage is close to the flow of the exhaust gas in the two-cylinder exhaust passage, so that the flow of the exhaust gas entering the two exhaust passages in the volute of the supercharger is balanced; therefore, the stress of the turbine blades is more uniform, the exhaust gas flow of the two exhaust passages is balanced, the EGR rate is obtained, and meanwhile, the reliability of the turbocharger can be improved and the pumping loss can be reduced.

Example two

The embodiment provides an inline five-cylinder diesel engine, and the single-channel EGR exhaust system of the inline five-cylinder diesel engine comprises the first embodiment.

Although the present invention has been described in detail by referring to the drawings in conjunction with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and substance of the present invention, any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a EGR exhaust gas system is got to in-line five cylinders diesel engine's single channel which characterized in that: including first exhaust passage (1), second exhaust passage (2), EGR exhaust passage (3) and turbo charger (4), three cylinder of engine is connected to first exhaust passage (1) one end, and turbo charger (4) is connected to the other end, two cylinders of engine are connected to second exhaust passage (2) one end, and turbo charger (4) is connected to the other end, EGR exhaust passage (3) are connected with first exhaust passage (1).

2. The single pass EGR exhaust system for an in-line five cylinder diesel engine of claim 1 wherein: the waste gas amount in the inner cavity of the first exhaust passage (1) is larger than that in the inner cavity of the second exhaust passage (2).

3. The single pass EGR exhaust system for an in-line five cylinder diesel engine of claim 2 wherein: the EGR exhaust passage (3) is connected to the first exhaust passage (1) close to the turbocharger (4), the turbocharger (4) comprises a first turbine passage (5) and a second turbine passage (6), the first turbine passage (5) is connected with the first exhaust passage (1), the second turbine passage (6) is connected with the second exhaust passage (2), and the minimum sectional area of the first turbine passage (5) is smaller than that of the second turbine passage (6).

4. The single pass EGR exhaust system for an in-line five cylinder diesel engine of claim 1 wherein: the turbocharger (4) is an asymmetric turbocharger.

5. The single pass EGR exhaust system for an in-line five cylinder diesel engine of claim 1 wherein: the first exhaust passage (1) is connected with a first cylinder, a second cylinder and a fifth cylinder of the engine, and the second exhaust passage (2) is connected with a third cylinder and a fourth cylinder of the engine.

6. The single pass EGR exhaust system for an in-line five cylinder diesel engine of claim 1 wherein: at least a part of the EGR exhaust passage (3) is provided as a bellows (7).

7. The single pass EGR exhaust system for an in-line five cylinder diesel engine of claim 1 wherein: the EGR exhaust gas channel (3) is connected with a flow dividing device (8), the flow dividing device (8) comprises at least two exhaust gas outlets, and different exhaust gas outlets are respectively connected to an EGR cooler through pipelines.

8. An inline five cylinder diesel engine comprising a single pass EGR exhaust system of an inline five cylinder diesel engine as claimed in any one of claims 1 to 7.