CN216975002U

CN216975002U - Exhaust pipe

Info

Publication number: CN216975002U
Application number: CN202220814130.9U
Authority: CN
Inventors: 李俊琦; 窦站成; 吕顺; 王利雨
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-07-15
Anticipated expiration: 2032-04-11

Abstract

The utility model discloses an exhaust pipe, which comprises an exhaust manifold and exhaust manifolds, wherein the exhaust manifolds comprise a first exhaust manifold, a second exhaust manifold, a third exhaust manifold, a fourth exhaust manifold, a fifth exhaust manifold and a sixth exhaust manifold; the pipe outlet cross sections of the first exhaust manifold and the sixth exhaust manifold are first cross sections, the pipe outlet cross sections of the second exhaust manifold and the fifth exhaust manifold are second cross sections, the pipe inlet cross sections of the first exhaust manifold and the second exhaust manifold are third cross sections, and the pipe outlet cross sections of the third exhaust manifold and the fourth exhaust manifold are fourth cross sections; the inner radius of the flow channel of the first section, the second section, the third section and the fourth section is smaller than the outer radius of the flow channel. The exhaust pipe of the utility model reduces the overall pressure loss of the exhaust pipeline, reduces the pressure drop and the air resistance of the exhaust manifold and is beneficial to exhaust.

Description

Exhaust pipe

Technical Field

The utility model relates to the technical field of engines, in particular to an exhaust pipe.

Background

The exhaust pipe is an important component of an engine exhaust system, and directly influences the utilization of the energy of the exhaust gas of the engine and the consumption rate of the fuel of the engine. The exhaust pipe includes an exhaust manifold and an exhaust manifold, and the exhaust manifold is a branched pipeline which is connected with the engine cylinder body and used for gathering the high-energy exhaust gas of each cylinder and leading the high-energy exhaust gas into the exhaust manifold.

The existing exhaust manifolds are generally of a bent pipe structure with a circular cross section, so that when exhaust air flows pass through the intersection position of adjacent exhaust manifolds, due to the interaction of centrifugal force gradient, viscous boundary layers and the like, high-energy fluid tends to flow to the outer side of the exhaust manifold, low-energy fluid tends to flow to the inner side of the exhaust manifold, and the flow migration forms secondary flow in the pipe, as shown in fig. 1. Compared with the pressure loss caused by common friction and viscous action, the secondary flow phenomenon can cause larger pressure loss, and meanwhile, the secondary flow can form a suction area on the inner side of the bent pipe and a pressure area on the outer side of the bent pipe, so that the problem of large air flow loss in the pipe is caused, and the secondary flow is not beneficial to exhaust.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides an exhaust pipe, which reduces the overall pressure loss of the exhaust pipe, reduces the pressure drop and the air resistance of the exhaust manifold, and facilitates the exhaust.

In order to achieve the purpose, the utility model provides the following technical scheme:

an exhaust pipe comprising an exhaust manifold and exhaust manifolds, the exhaust manifolds comprising a first exhaust manifold, a second exhaust manifold, a third exhaust manifold, a fourth exhaust manifold, a fifth exhaust manifold and a sixth exhaust manifold, the exhaust manifold comprising a first exhaust manifold and a second exhaust manifold;

the pipe outlet cross sections of the first exhaust manifold and the sixth exhaust manifold are first cross sections, the pipe outlet cross sections of the second exhaust manifold and the fifth exhaust manifold are second cross sections, the pipe inlet cross sections of the first exhaust manifold and the second exhaust manifold are third cross sections, and the pipe outlet cross sections of the third exhaust manifold and the fourth exhaust manifold are fourth cross sections; the first section, the second section, the third section and the fourth section are all non-circular sections;

the inner radius of the flow channel of the first section, the second section, the third section and the fourth section is smaller than the outer radius of the flow channel;

the outer sides of the flow passages of the first section, the second section, the third section and the fourth section comprise a first arc and a second arc which are arranged at intervals, and the first arc and the second arc are arranged at intervals of a first distance;

the inner sides of the flow passages of the first section, the second section, the third section and the fourth section comprise a third arc and a fourth arc which are arranged at intervals, and the third arc and the fourth arc are arranged at intervals of a second distance; the outer side of the runner refers to the side of the exhaust manifold far away from the central axis Y, and the inner side of the runner refers to the side close to the central axis Y.

Optionally, the first arc and the second arc have the same radius and are symmetrically arranged; the third arc and the fourth arc have the same radius and are symmetrically arranged.

Optionally, the length of the first distance is less than the length of the second distance.

Optionally, the first, second, third and fourth cross-sections have a cross-section length that is the same as a cross-section width.

Optionally, an included angle between the first cross section and the inlet plane of the exhaust pipe is a first included angle, and the first included angle is 80-95 °.

Optionally, an included angle between the second cross section and the inlet plane of the exhaust pipe is a second included angle, and the second included angle is 15-25 °.

Optionally, an included angle between the third cross section and the inlet plane of the exhaust pipe is a third included angle, and the third included angle is 40-50 °.

Optionally, an included angle between the fourth cross section and the inlet plane of the exhaust pipe is a fourth included angle, and the fourth included angle is 15-20 °.

Alternatively, the first exhaust manifold and the sixth exhaust manifold are disposed symmetrically about a central axis of the exhaust pipe, the second exhaust manifold and the fifth exhaust manifold are disposed symmetrically about a central axis of the exhaust pipe, and the third exhaust manifold and the fourth exhaust manifold are disposed symmetrically about a central axis of the exhaust pipe.

According to the exhaust pipe provided by the utility model, the first cross section, the second cross section, the third cross section and the fourth cross section are all set to be non-circular cross sections, and the inner radius of the flow channel of the first cross section, the second cross section, the third cross section and the fourth cross section is smaller than the outer radius of the flow channel, so that the airflow flows to the outer side of the flow channel more, the pressure of a pressure area formed on the outer side of the bent pipe is increased, the fluid speed of the pressure area on the outer side of the flow channel is increased, the fluid speed of a suction area on the inner side of the bent pipe is reduced, the migration of low-energy fluid is inhibited, the driving force of secondary flow is weakened, the target of controlling the centrifugal force gradient of the cross section is achieved, the overall pressure loss of the pipeline is reduced, and the exhaust is facilitated.

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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the flow direction of the air flow at a cross-section of a bent position of a prior art exhaust manifold;

FIG. 2 is a schematic structural diagram of an exhaust pipe according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a cross section of an exhaust manifold according to an embodiment of the present invention.

Wherein:

1. a first exhaust manifold, 101, a first cross-section, 2, a second exhaust manifold, 201, a second cross-section, 3, a third exhaust manifold, 301, a fourth cross-section, 4, a fourth exhaust manifold, 5, a fifth exhaust manifold, 6, a sixth exhaust manifold, 7, a first exhaust manifold, 701, a third cross-section, 8, a second exhaust manifold, 9, a first arc, 10, a second arc, 11, a third arc, 12, a fourth arc.

Detailed Description

The utility model discloses an exhaust pipe, which reduces the overall pressure loss of an exhaust pipeline, reduces the pressure drop and the air resistance of an exhaust manifold and is beneficial to exhaust.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 2 and 3, the exhaust pipe of the present invention includes an exhaust manifold and an exhaust manifold, wherein the exhaust manifold includes a first exhaust manifold 1, a second exhaust manifold 2, a third exhaust manifold 3, a fourth exhaust manifold 4, a fifth exhaust manifold 5 and a sixth exhaust manifold 6, and the exhaust manifold includes a first exhaust manifold 7 and a second exhaust manifold 8.

The pipe outlet cross-sections of the first exhaust manifold 1 and the sixth exhaust manifold 6 are a first cross-section 101, the pipe outlet cross-sections of the second exhaust manifold 2 and the fifth exhaust manifold 5 are a second cross-section 201, the pipe inlet cross-sections of the first exhaust manifold 7 and the second exhaust manifold 8 are a third cross-section 701, and the pipe outlet cross-sections of the third exhaust manifold 3 and the fourth exhaust manifold 4 are a fourth cross-section 301. The first section 101, the second section 201, the third section 701 and the fourth section 301 are all non-circular sections. The first, second, third and

fourth cross-sections

101, 201, 701 and 301 have a smaller flow path inside radius than the flow path outside radius.

The first exhaust manifold 1, the second exhaust manifold 2 and the third exhaust manifold 3 are communicated with one end of a first exhaust manifold 7, and the other end of the first exhaust manifold 7 is communicated with a supercharger. The fourth exhaust manifold 4, the fifth exhaust manifold 5 and the sixth exhaust manifold 6 communicate with one end of a second exhaust manifold 8, and the other end of the second exhaust manifold 8 communicates with a supercharger. The pipe outlet is the outlet for exhaust gas in the exhaust manifold, which is the end remote from the cylinder. It will be appreciated that the first exhaust manifold 1 communicates with the first cylinder, the second exhaust manifold 2 communicates with the second cylinder, the third exhaust manifold 3 communicates with the third cylinder, the fourth exhaust manifold 4 communicates with the fourth cylinder, the fifth exhaust manifold 5 communicates with the fifth cylinder, and the sixth exhaust manifold 6 communicates with the sixth cylinder. The above-described runner outer side refers to a side of the exhaust manifold away from the central axis Y, and the runner inner side refers to a side close to the central axis Y.

According to the exhaust pipe, the first cross section 101, the second cross section 201, the third cross section 701 and the fourth cross section 301 are all set to be non-circular cross sections, and the inner radius of the flow channel of the first cross section 101, the second cross section 201, the third cross section 701 and the fourth cross section 301 is smaller than the outer radius of the flow channel, so that airflow flows to the outer side of the flow channel more, the pressure of a pressure area formed on the outer side of the bent pipe is increased, the fluid speed of the pressure area on the outer side of the flow channel is increased, the fluid speed of a suction area on the inner side of the bent pipe is reduced, the migration of low-energy fluid is inhibited, the driving force of secondary flow is weakened, the goal of controlling the centrifugal force gradient of the cross section is achieved, the overall pressure loss of the pipeline is reduced, and exhaust is facilitated.

Further, the outer sides of the flow passage of the first cross section 101, the second cross section 201, the third cross section 701 and the fourth cross section 301 comprise a first circular arc 9 and a second circular arc 10 which are arranged at intervals, and the first circular arc 9 and the second circular arc 10 are arranged at intervals of a first distance D1. The spaced arrangement here means that the ends of the first arc 9 and the second arc 10 which are close to each other do not contact each other. The inner sides of the flow paths of the first section 101, the second section 201, the third section 701 and the fourth section 301 include a third arc 11 and a fourth arc 12 which are arranged at intervals, and the third arc 11 and the fourth arc 12 are arranged at intervals of a second distance D2. The spaced arrangement here means that the ends of the third arc 11 and the fourth arc 12 close to each other do not contact each other. By arranging the first arc 9 and the second arc 10 at a first distance D1 and the third arc 11 and the fourth arc 12 at a second distance D2, the vortex formed by secondary flow is prevented, and the air resistance in the air flow conveying process is reduced.

The length of the first distance D1 is smaller than that of the second distance D2, so that migration of the low-energy fluid is effectively inhibited, and the driving force of secondary flow is weakened.

Specifically, the first circular arc 9 and the second circular arc 10 have the same radius, and are symmetrically disposed about the horizontal axis of the cross section. The third arc 11 and the fourth arc 12 have the same radius and are symmetrically arranged about the transverse axis of the cross-section, as shown in fig. 3.

In an embodiment, the first section 101, the second section 201, the third section 701 and the fourth section 301 have a section length L which is the same as the section width H.

As shown in fig. 2, the angle between the first cross section 101 and the inlet plane of the exhaust pipe is a first angle N, and the first angle N is 80 ° to 95 °. The angle between the second cross-section 201 and the exhaust pipe inlet plane is a second angle a, which is 15-25 °. The included angle between the third section 701 and the exhaust pipe inlet plane is a third included angle B, and the third included angle B is 40-50 degrees. The included angle between the fourth section 301 and the inlet plane of the exhaust pipe is a fourth included angle C which is 15-20 degrees.

Specifically, as shown in fig. 2, the first exhaust manifold 1 and the sixth exhaust manifold 6 are disposed symmetrically about the central axis Y of the exhaust pipe, the second exhaust manifold 2 and the fifth exhaust manifold 5 are disposed symmetrically about the central axis Y of the exhaust pipe, and the third exhaust manifold 3 and the fourth exhaust manifold 4 are disposed symmetrically about the central axis Y of the exhaust pipe.

In one embodiment, the first circular arc and the second circular arc of the first cross section 101 have a radius of R1, R1 = (0.9-0.95) × 0.5 × D1, the third circular arc and the fourth circular arc of the first cross section 101 have a radius of R2, and R2= (0.85-0.9) × 0.5 × D1, wherein D1 is the equivalent cross-sectional diameter of the first exhaust manifold 1. R1-R2 =0.05 × 0.5 × D1. The radii of the first circular arc and the second circular arc of the second cross section 201 are R3, R3 = (0.98-0.99) × 0.5 × D2, the radii of the third circular arc and the fourth circular arc of the second cross section 201 are R4, R4= (0.95-0.96) × 0.5 × D2, where D2 is the equivalent cross-sectional diameter of the second exhaust manifold 2. R3-R4 =0.03 × 0.5 × D2. The radii of the first and second circular arcs of the third cross section 701 are R5, R5 = (0.9-0.95) × 0.5 × D3, the radii of the third and fourth circular arcs of the third cross section 701 are R6, R6= (0.85-0.9) × 0.5 × D3, where D3 is the equivalent cross-sectional diameter of the tube inlet of the first exhaust manifold 7. R5-R6 =0.05 × 0.5 × D3. The radii of the first and second circular arcs of the fourth cross section 301 are R7, R7 = (0.9-0.95) × 0.5D4, the radii of the third and fourth circular arcs of the fourth cross section 301 are R8, R8= (0.85-0.9) × 0.5D4, where D4 is the equivalent cross-sectional diameter of the third exhaust manifold 3. R7-R8 =0.05 × 0.5D 4.

According to the exhaust pipe, the shape and the area of the section of the pipeline of the exhaust manifold are quantitatively designed through software simulation and experiments, so that the pressure drop and the air resistance of the exhaust manifold are reduced, and the efficient utilization of exhaust energy is realized.

In the description of the present solution, it is to be understood that the terms "upper", "lower", "vertical", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present solution.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An exhaust pipe comprising an exhaust manifold and exhaust manifolds, wherein the exhaust manifolds comprise a first exhaust manifold, a second exhaust manifold, a third exhaust manifold, a fourth exhaust manifold, a fifth exhaust manifold and a sixth exhaust manifold, and wherein the exhaust manifold comprises a first exhaust manifold and a second exhaust manifold;

the outlet cross sections of the tubes of the first exhaust manifold and the sixth exhaust manifold are first cross sections, the outlet cross sections of the tubes of the second exhaust manifold and the fifth exhaust manifold are second cross sections, the inlet cross sections of the tubes of the first exhaust manifold and the second exhaust manifold are third cross sections, and the outlet cross sections of the tubes of the third exhaust manifold and the fourth exhaust manifold are fourth cross sections; the first section, the second section, the third section and the fourth section are all non-circular sections;

2. The exhaust pipe according to claim 1, wherein the first circular arc and the second circular arc have the same radius and are symmetrically arranged; the third arc and the fourth arc have the same radius and are symmetrically arranged.

3. The exhaust pipe of claim 1 wherein the length of the first distance is less than the length of the second distance.

4. The exhaust pipe of claim 1 wherein the first, second, third and fourth cross sections have a cross section length and a cross section width that are the same.

5. The exhaust pipe of claim 1 wherein the first cross-section includes a first angle with respect to a plane of an inlet of the exhaust pipe, the first angle being between 80 ° and 95 °.

6. The exhaust pipe of claim 1 wherein the second cross-section includes a second angle with respect to the plane of the exhaust pipe inlet, the second angle being between 15 ° and 25 °.

7. The exhaust pipe of claim 1 wherein the third cross-section includes a third angle with respect to the plane of the exhaust pipe inlet, the third angle being between 40 ° and 50 °.

8. The exhaust pipe of claim 1 wherein the fourth cross-section includes a fourth angle with respect to the plane of the exhaust pipe inlet, the fourth angle being between 15 ° and 20 °.

9. The exhaust pipe according to claim 1, wherein the first exhaust manifold and the sixth exhaust manifold are disposed symmetrically about a central axis of the exhaust pipe, the second exhaust manifold and the fifth exhaust manifold are disposed symmetrically about a central axis of the exhaust pipe, and the third exhaust manifold and the fourth exhaust manifold are disposed symmetrically about a central axis of the exhaust pipe.