CN115217603A

CN115217603A - Integrated exhaust manifold, engine and vehicle

Info

Publication number: CN115217603A
Application number: CN202210248638.1A
Authority: CN
Inventors: 纪雷
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-10-21
Anticipated expiration: 2042-03-14
Also published as: CN115217603B

Abstract

The invention provides an integrated exhaust manifold, an engine and a vehicle, which comprise a plurality of cylinder exhaust pipes, wherein the air inlet end of each cylinder exhaust pipe is formed by the convergence of the exhaust ends of a plurality of branch pipes, the cylinder exhaust pipes comprise a first exhaust pipe, a second exhaust pipe and a third exhaust pipe which are sequentially arranged, the exhaust end of the first exhaust pipe and the exhaust end of the second exhaust pipe are converged to form a first converging channel, the exhaust end of the first converging channel and the exhaust end of the third exhaust pipe are converged to form a second converging channel, and the exhaust end of the second converging channel forms an exhaust outlet. The invention is beneficial to adjusting the gas flow velocity among the exhaust pipes of each cylinder, is convenient for the gas in the first exhaust pipe, the second exhaust pipe and the third exhaust pipe to be stably converged, reduces the energy loss caused by gas convergence, improves the energy utilization rate of high-temperature waste gas, can improve the energy utilization rate of a supercharger turbine and ensures the power output performance of an engine.

Description

Integrated exhaust manifold, engine and vehicle

Technical Field

The invention belongs to the technical field of vehicle power systems, and particularly relates to an integrated exhaust manifold, an engine and a vehicle.

Background

With the development of the automobile industry and the obvious environmental problems brought by the development of the automobile industry, the requirement on automobile emission is higher and higher, and the technology of integrating the cylinder cover with the exhaust manifold is developed in order to meet the emission requirement and reduce the cost of the whole automobile. The technology can control the exhaust temperature within the acceptable temperature limit value of the system parts after exhaust on the premise of not adding rich mixed gas or slightly adding rich mixed gas in a high-speed and high-load operation area of the engine, can reduce 10-30% of oil consumption in the working area, and is beneficial to reducing carbon emission.

However, the existing integrated exhaust manifold design has less consideration to the energy loss caused by the exhaust manifold in the exhaust process, and is not beneficial to improving the power performance output of the engine.

Disclosure of Invention

The embodiment of the invention provides an integrated exhaust manifold, an engine and a vehicle, and aims to reduce energy loss of high-temperature waste gas in an exhaust process and improve the energy utilization rate of the high-temperature waste gas.

In order to realize the purpose, the invention adopts the technical scheme that:

in a first aspect, an integrated exhaust manifold is provided, comprising:

the cylinder exhaust pipe comprises a first exhaust pipe, a second exhaust pipe and a third exhaust pipe which are sequentially arranged, wherein the exhaust end of the first exhaust pipe and the exhaust end of the second exhaust pipe are joined to form a first confluence channel, the exhaust end of the first confluence channel and the exhaust end of the third exhaust pipe are joined to form a second confluence channel, and the exhaust end of the second confluence channel forms an exhaust port.

With reference to the first aspect, in one possible implementation manner, in the same cylinder exhaust pipe, the plurality of branch pipes include a first branch pipe and a second branch pipe;

defining a vertical plane where central axes of all cylinders are located as a first reference plane, defining a vertical distance between a junction of the first branch pipe and the second branch pipe and the first reference plane as h, defining a distance between a center of an air inlet end of the first branch pipe and a center of an air inlet end of the second branch pipe as d in the same cylinder exhaust pipe, and satisfying the following conditions: d ≦ h ≦ 2d.

With reference to the first aspect, in a possible implementation manner, the exhaust port is disposed near the third exhaust pipe.

With reference to the first aspect, in a possible implementation manner, a vertical distance between a junction of the first branch pipe and the second branch pipe in the first exhaust pipe and the first reference plane is defined as h1, a vertical distance between a junction of the first branch pipe and the second branch pipe in the second exhaust pipe and the first reference plane is defined as h2, and the following is satisfied between h1 and h 2: d ≦ h2 ≦ h1.

With reference to the first aspect, in a possible implementation manner, a vertical distance between a junction of the first branch pipe and the second branch pipe in the third exhaust pipe and the first reference plane is defined as h3, and the following relationships among h1, h2, and h3 are satisfied: d ≦ h2 ≦ h1 ≦ h3.

With reference to the first aspect, in one possible implementation manner, a vertical distance from the exhaust port to the first reference plane is defined as H;

defining the center distance of two adjacent cylinders as D;

a vertical distance from a junction of the first exhaust pipe and the second exhaust pipe to the first reference plane is defined as h '1, a vertical distance from a junction of the first merging passage and the third exhaust pipe to the first reference plane is defined as h'2, and the following is satisfied between h '1 and h' 2: 0.4H ≦ H '2 ≦ H'1 ≦ D.

With reference to the first aspect, in a possible implementation manner, an included angle between a junction of the exhaust end of the first exhaust pipe and the exhaust end of the second exhaust pipe and the first reference plane is defined as a1, where a1 is less than 10 °.

With reference to the first aspect, in one possible implementation manner, an included angle between a junction of the first merging channel exhaust end and the third exhaust pipe exhaust end and the first reference plane is defined as a2, where a2 is less than 20 °.

The shown scheme of this application embodiment, compared with the prior art, waste gas in first blast pipe and the second blast pipe joins earlier, join with the waste gas in the third blast pipe at last again, discharge through the gas vent together, get into the turbine of booster, this kind of mode of joining is favorable to adjusting the gas velocity of flow between each jar blast pipe, be convenient for first blast pipe, gas in second blast pipe and the third blast pipe steadily joins, reduce the energy loss that gas joins the cause, the energy utilization of high temperature waste gas has been improved, then can promote the energy utilization of booster turbine, guarantee the power take off performance of engine.

In a second aspect, embodiments of the present invention further provide an engine, including the integrated exhaust manifold described above.

Compared with the prior art, the scheme shown in the embodiment of the application has the advantages that by adopting the integrated exhaust manifold, the exhaust performance of the integrated exhaust manifold is improved, the energy utilization rate and the running stability of the supercharger turbine are improved, the intermittent frustration of the engine caused by the fluctuation of the supercharger action due to the work-done exhaust difference of different cylinders is reduced, and the power output performance of the engine is further ensured.

In a third aspect, the embodiment of the invention further provides a vehicle, which comprises the engine.

Compared with the prior art, the scheme shown in the embodiment of the application has the advantages that by adopting the engine, the energy utilization rate and the running stability of the supercharger turbine are improved, the pause and frustration feeling of the engine caused by the fluctuation of the supercharger action due to the working and exhaust differences of different cylinders is reduced, and the power output performance of the engine is further ensured.

Drawings

FIG. 1 is a schematic diagram of an integrated exhaust manifold according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a variation trend of the flow coefficient under each valve lift, wherein the abscissa is the valve lift and the ordinate is the flow coefficient.

Description of the reference numerals:

100. a cylinder exhaust pipe; 110. a first branch pipe; 120. a second branch pipe; 10a, a first exhaust pipe; 10b, a second exhaust pipe; 10c, a third exhaust pipe;

200. an exhaust port;

300. a first reference plane;

400. an exhaust valve conduit;

500. a first confluent passage;

600. a second confluent passage.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the claims, the specification and the drawings of the present invention, unless otherwise expressly limited, the terms "first", "second" or "third", etc. are used for distinguishing between different items and not for describing a particular sequence.

In the claims, the description and the drawings of the present invention, unless otherwise expressly limited, the terms "central," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," "counterclockwise," "upper," "lower," and the like in terms of orientation or positional relationship are used herein with respect to the indicated orientation or positional relationship, are based on the orientation and positional relationship as shown in the figures, and are intended for ease of description and to simplify the description and not to indicate or imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore are not to be construed as limiting the scope of the present invention in any way.

In the claims, the description and the drawings of the present application, unless otherwise expressly limited, the terms "fixedly connected" or "fixedly connected" should be interpreted broadly, that is, any connection between the two that does not have a relative rotational or translational relationship, that is, non-detachably fixed, integrally connected, and fixedly connected by other devices or elements.

In the claims, specification and drawings of the present invention, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting.

Referring also to FIG. 1, an integrated exhaust manifold provided by the present invention will now be described. The integrated exhaust manifold comprises

A plurality of cylinder exhaust pipes, the intake end of each cylinder exhaust pipe 100 being formed by the merging of the exhaust ends of a plurality of branch pipes, the plurality of cylinder exhaust pipes 100 including a first exhaust pipe 10a, a second exhaust pipe 10b, and a third exhaust pipe 10c arranged in this order, the exhaust end of the first exhaust pipe 10a merging with the exhaust end of the second exhaust pipe 10b to form a first merging passage 500, the exhaust end of the first merging passage 500 merging with the exhaust end of the third exhaust pipe 10c to form a second merging passage 600, and the exhaust end of the second merging passage 600 forming the exhaust port 200.

The integrated exhaust manifold that this embodiment provided, the mode of converging of each blast pipe has rationally been arranged, compared with the prior art, the waste gas in first blast pipe 10a and the second blast pipe 10b converges earlier, finally converges with the waste gas in the third blast pipe 10c again, discharge through gas vent 200 together, get into the turbine of booster, this kind of mode of converging is favorable to adjusting the gas velocity of flow between each cylinder blast pipe 100, be convenient for first blast pipe 10a, the gas in second blast pipe 10b and the third blast pipe 10c steadily converges, reduce the energy loss that gas converged and cause, the energy utilization of high temperature waste gas has been improved, then can promote the energy utilization of booster turbine, guarantee the power take off performance of engine.

To further reduce the energy loss caused by the confluence of the two manifolds, referring to fig. 1, in the same cylinder exhaust pipe 100, a plurality of branch pipes including a first branch pipe 110 and a second branch pipe 120; a vertical plane where central axes of all cylinders are located is defined as a first reference plane 300, in the same cylinder exhaust pipe 100, a vertical distance between a junction of the first branch pipe 110 and the second branch pipe 120 and the first reference plane 300 is defined as h, a distance between a center of an air inlet end of the first branch pipe 110 and a center of an air inlet end of the second branch pipe 120 is defined as d, and the distance between h and d satisfies the following conditions: d ≦ h ≦ 2d. In the embodiment, the design difficulty of the branch pipes is reduced by reasonably setting the converging positions of the branch pipes in the same cylinder exhaust pipe 100, so that the gas in the first branch pipe 110 and the gas in the second branch pipe 120 can be converged stably, the energy loss during gas convergence is further reduced, and the energy utilization rate of high-temperature waste gas is improved.

In some embodiments, referring to fig. 1, the exhaust port 200 is disposed proximate the third exhaust pipe 10 c. The embodiment can better arrange the supercharger and the three-way catalytic converter, is convenient for keeping the compactness of the whole machine, meets the miniaturization arrangement requirement of a power system, is favorable for carrying different whole vehicle cabins, and improves the universality of the engine.

In some embodiments, referring to fig. 1, a vertical distance h1 between a junction of the first branch pipe 110 and the second branch pipe 120 in the first exhaust pipe 10a and the first reference plane is defined, a vertical distance h2 between a junction of the first branch pipe 110 and the second branch pipe 120 in the second exhaust pipe 10b and the first reference plane 300 is defined, and the following is satisfied between h1 and h 2: d ≦ h2 ≦ h1.

In the embodiment, the merging positions of the manifolds corresponding to different cylinders are reasonably set, so that the stability of the first branch pipe 110 and the second branch pipe 120 at the merging positions is improved, and the energy loss of energy gas is reduced; meanwhile, because the exhaust path corresponding to h2 is shorter than the exhaust path corresponding to h1, the manifold corresponding to h2 is preferentially converged compared with the manifold corresponding to h1 in the embodiment, so that the flow speed of the exhaust at the junction of the manifolds corresponding to h2 is equivalent to that of the exhaust at the junction of the manifolds corresponding to h2, the fluctuation of the gas in different pipelines is effectively reduced, the stable operation of a supercharger turbine is ensured, and the fluctuation of the supercharger action caused by the working exhaust difference of different cylinders is further reduced.

On the basis of the above embodiment, in order to further reduce the fluctuation of the gas in the different pipelines, referring to fig. 1, the vertical distance between the junction of the first branch pipe 110 and the second branch pipe 120 in the third exhaust pipe 10c and the first reference plane 300 is defined as h3, and the following relationships among h1, h2, and h3 are satisfied: d ≦ h2 ≦ h1 ≦ h3. Because the exhaust path corresponding to h3 is shorter than the rest two exhaust paths, the flow speed of the exhaust at the junction of the manifold corresponding to h3 is approximately equal to the flow speed at the junction of the manifold corresponding to h1 and the manifold corresponding to h2, and the smoothness of the airflow is improved.

In specific implementation, the flow can be reduced by reducing the cross-sectional areas of the first branch pipe 110 and the second branch pipe 120 corresponding to h3, and then the similarity between the flow speed of the cylinder exhaust pipe 100 corresponding to h3 and the flow speed of the other two cylinder exhaust pipes 100 is further improved.

The above definition of the relationship among h1, h2 and h3 can effectively improve the problem that the air flow in the exhaust pipes 100 of different cylinders causes air fluctuation in different pipelines at the exhaust port 200 due to air flow speed or air flow energy difference, so as to ensure the stable operation of the turbocharger turbine and dilute the fluctuation of the supercharger action caused by the work-done exhaust difference of different cylinders.

In some embodiments, referring to fig. 1, the vertical distance H from the exhaust port 200 to the first reference plane 300 is defined; defining the center distance of two adjacent cylinders as D; it is satisfied that a vertical distance from a junction of the first exhaust pipe 10a and the second exhaust pipe 10b to the first reference plane 300 is defined as h '1, and a vertical distance from a junction of the first merging passage 500 and the third exhaust pipe 10c to the first reference plane 300 is defined as h'2, h '1 and h' 2: 0.4H ≦ H '2 ≦ H'1 ≦ D.

In this embodiment, the airflow in the pipeline after the first exhaust pipe 10a and the second exhaust pipe 10b are merged flows directly to the exhaust port 200, so as to effectively prevent the airflow from flowing into the third exhaust pipe 10c, and the gas in the third exhaust pipe 10c cannot flow into the first merging channel 500, thereby avoiding causing unnecessary energy loss to result in incomplete exhaust, and affecting the next work cycle, and improving the utilization rate of the airflow. In addition, the embodiment can also effectively reduce the energy difference of two gas flows (the gas flow in the first merging channel 500 and the gas flow in the third exhaust pipe 10 c), reduce the difference of gas flow speed or gas flow energy caused by the gas flows in different exhaust pipes at the exhaust port 200, reduce the fluctuation of gas in different pipelines, and improve the smoothness of the gas flows of different cylinder exhaust pipes 100 during merging.

In some embodiments, referring to fig. 1, the angle between the junction of the exhaust end of the first exhaust pipe 10a and the exhaust end of the second exhaust pipe 10b and the first reference plane 300 is defined as a1, a1<10 °. In the embodiment, by reasonably setting the converging angle of the first exhaust pipe 10a and the second exhaust pipe 10b, the second exhaust pipe 10b with the approximately stable airflow direction of the first exhaust pipe 10a converges, thereby effectively preventing the airflow from flowing backwards, such as the second exhaust pipe 10b, to cause unnecessary energy loss, and avoiding causing incomplete exhaust to influence the next work cycle; therefore, the embodiment is beneficial to improving the energy utilization rate of high-temperature exhaust gas and improving the energy utilization rate of the supercharger turbine.

It should be noted that, a junction area between the exhaust end of the first exhaust pipe 10a and the exhaust end of the second exhaust pipe 10b is an arc-shaped structure, a curvature center of the arc-shaped structure is located at a side close to the first reference plane 300, and a point where a vertical distance between the arc-shaped structure and the first reference plane 300 is the largest is a "junction between the exhaust end of the first exhaust pipe 10a and the exhaust end of the second exhaust pipe 10 b".

On the basis of the above embodiment, in order to further enhance the rationality of the setting of the merging angle, referring to fig. 1, the angle between the junction of the exhaust end of the first merging passage 500 and the exhaust end of the third exhaust pipe 10c and the first reference plane 300 is defined as a2, and a2<20 °. The operation principle is similar to the merging principle between the first exhaust pipe 10a and the second exhaust pipe 10b, and the description thereof is omitted.

It should be noted that the merging region of the exhaust end of the first merging passage 500 and the exhaust end of the third exhaust pipe 10c is an arc-shaped structure, the center of curvature of the arc-shaped structure is located on the side close to the first reference plane 300, and the point where the perpendicular distance of the arc-shaped structure from the first reference plane 300 is the largest is the "merging point of the exhaust end of the first merging passage 500 and the exhaust end of the third exhaust pipe 10 c".

The integrated exhaust manifold introduces the design concept of 'hedging and guiding', the position of the exhaust port 200 is optimized, the position of each pipeline junction part is improved, the structure of the junction position is improved, the flow of high-temperature gas is guided, the gas flow resistance and the gas pressure fluctuation are reduced on the premise of not influencing the pipeline space arrangement mode, the energy utilization rate of high-temperature waste gas and the exhaust performance of the integrated exhaust manifold are further improved (as shown in figure 2, according to experimental data, the flow coefficient is stably increased along with the increase of the valve lift), the energy utilization rate and the operation stability of a supercharger turbine can be finally improved, the problem that the acting exhaust difference of different cylinders causes the fluctuation of the supercharger action to cause the feeling of engine suspension is solved, and the vehicle quality is improved.

Based on the same inventive concept, the embodiment of the application also provides an engine comprising the integrated exhaust manifold.

Compared with the prior art, the engine provided by the embodiment has the advantages that by adopting the integrated exhaust manifold, the exhaust performance of the integrated exhaust manifold is improved, the energy utilization rate and the operation stability of the supercharger turbine are improved, the pause and frustration of the engine caused by the fluctuation of the supercharger action due to the working exhaust difference of different cylinders are reduced, and the power output performance of the engine is further ensured.

Based on the same inventive concept, the embodiment of the application also provides a vehicle comprising the engine.

Compared with the prior art, the vehicle provided by the embodiment has the advantages that the energy utilization rate and the running stability of the supercharger turbine are improved by adopting the engine, the suspension feeling of the engine caused by the fluctuation of the supercharger action due to the work-applying and exhaust differences of different cylinders is reduced, and the power output performance of the engine is further ensured.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An integrated exhaust manifold integrated on a cylinder head, comprising:

2. The integrated exhaust manifold according to claim 1, wherein in the same cylinder exhaust pipe, the plurality of branch pipes include a first branch pipe and a second branch pipe;

3. The integrated exhaust manifold according to claim 1 or 2, wherein the exhaust port is disposed adjacent to the third exhaust pipe.

4. The integrated exhaust manifold according to claim 2, wherein a vertical distance between a junction of the first branch pipe and the second branch pipe in the first exhaust pipe and the first reference plane is defined as h1, a vertical distance between a junction of the first branch pipe and the second branch pipe in the second exhaust pipe and the first reference plane is defined as h2, and the h1 and the h2 satisfy: d ≦ h2 ≦ h1.

5. The integrated exhaust manifold according to claim 4, wherein a perpendicular distance h3 between a point where the first branch pipe and the second branch pipe in the third exhaust pipe meet the first reference plane is defined, and the h1, the h2, and the h3 satisfy: d ≦ h2 ≦ h1 ≦ h3.

6. The integrated exhaust manifold of claim 2, wherein a vertical distance H from the exhaust port to the first reference plane is defined;

defining the center distance of two adjacent cylinders as D;

a vertical distance from a junction of the first exhaust pipe and the second exhaust pipe to the first reference plane is defined as h '1, a vertical distance from a junction of the first merging passage and the third exhaust pipe to the first reference plane is defined as h'2, and the distance between h '1 and h'2 satisfies: 0.4H ≦ H '2 ≦ H'1 ≦ D.

7. The integrated exhaust manifold according to claim 2, wherein an angle between a junction of the first exhaust pipe exhaust end and the second exhaust pipe exhaust end and the first reference plane is defined as a1, the a1<10 °.

8. The integrated exhaust manifold according to claim 2 or 7, wherein an angle between a point where the first merging channel exhaust end and the third exhaust pipe exhaust end meet the first reference plane is defined as a2, and the a2<20 °.

9. An engine comprising an integrated exhaust manifold according to any of claims 1 to 8.

10. A vehicle characterized by comprising the engine of claim 9.