CN214577322U - Multi-combination exhaust manifold and engine - Google Patents

Abstract

A multi-junction exhaust manifold and engine, the multi-junction exhaust manifold comprising: the first exhaust manifold, the second exhaust manifold and the third exhaust manifold are intersected to form a first branch pipe, a second branch pipe and a third branch pipe, the fourth exhaust manifold, the fifth exhaust manifold and the sixth exhaust manifold are intersected to form a fourth branch pipe, a fifth branch pipe and a sixth branch pipe, the seventh exhaust manifold, the eighth exhaust manifold and the ninth exhaust manifold are intersected to form a seventh branch pipe, an eighth branch pipe and a ninth branch pipe, the tenth exhaust manifold, the eleventh branch pipe and the twelfth exhaust manifold are intersected at an inlet of an exhaust manifold, the exhaust manifold is connected with a silencer, a catalyst or a turbine and the like to form a 3-4-1 exhaust pipeline structure which comprises three exhaust manifolds which are converged together, four exhaust branch pipes are converged together, and one exhaust manifold is connected with a rear part. The exhaust pipe arrangement structure can improve dynamic property and emission property.

Description

Multi-combination exhaust manifold and engine

Technical Field

The utility model relates to an engine technical field, more specifically, the utility model relates to an engine exhaust manifold that is used for 12 jar engines of V type and an in-line 6 jar engines.

Background

With the gradual implementation of the national energy saving and emission reduction plan, the main problems of the engine at present are how to reduce the fuel consumption, improve the reliability and reduce the emission so as to meet the increasingly strict regulatory requirements.

To reduce fuel consumption and improve engine reliability, innovative design of the exhaust system is required, exhaust interference is reduced, the coefficient of residual exhaust gas in the cylinder is reduced, antiknock performance is improved, exhaust temperature is reduced, and exhaust back pressure is reduced. Generally, the exhaust duration is far greater than that of an exhaust stroke (180-degree crank angle), an exhaust valve is opened at the end of a power stroke, free exhaust can be achieved, pumping loss is reduced, in the exhaust stroke stage, a piston moves upwards to push waste gas in a cylinder out of the cylinder, after the exhaust stroke is finished, the exhaust valve is closed later, air flow inertia is used for exhausting, residual waste gas in the cylinder is reduced, and the air charging efficiency is improved. When the V-shaped 12 cylinders or the in-line 6 cylinders share a set of exhaust manifold, supercharger, muffler and catalyst, the exhaust of each cylinder can generate serious interference, as shown in FIG. 3(12 cylinder exhaust diagram) and FIG. 4(6 cylinder exhaust diagram). In fig. 3, the exhaust of one cylinder is interfered by the exhaust of eight cylinders, five cylinders, ten cylinders, three cylinders and twelve cylinders, so that the exhaust is not smooth in the free exhaust stage, the pumping loss is increased in the exhaust stroke stage, the exhaust capacity is reduced in the exhaust tail stage, the residual exhaust gas in the cylinder is increased, the inflation efficiency is reduced, and the knocking tendency is increased. In fig. 4, exhaust of one cylinder is disturbed by exhaust of five cylinders, three cylinders and four cylinders. For an in-line 6-cylinder or V-type 12-cylinder engine, because the number of cylinders is large, the ignition interval is small, and strong interference exists in exhaust, a proper exhaust pipeline needs to be designed to reduce the exhaust interference among the cylinders. The traditional V-type 12-cylinder engine and the in-line 6-cylinder engine adopt exhaust manifolds which are sequentially connected in series, exhaust among cylinders is mutually interfered, so that the residual exhaust gas coefficient of each cylinder is increased, combustion is deteriorated, or knocking combustion is caused, and the control must be carried out through measures such as fuel enrichment or ignition angle delay, and the dynamic property and the economical efficiency of the engine are influenced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a multiunit amalgamation formula exhaust manifold and engine to solve the problem of exhaust mutual interference between each jar that exists among the prior art, thereby make scavenging more abundant, it is more unobstructed to exhaust.

The application provides a multi-combination exhaust manifold which is applied to a V-shaped 12-cylinder engine and is characterized by comprising a first exhaust manifold, a second exhaust manifold, a third exhaust manifold, a fourth exhaust manifold, a fifth exhaust manifold, a sixth exhaust manifold, a seventh exhaust manifold, an eighth exhaust manifold, a ninth exhaust manifold, a tenth exhaust manifold, an eleventh exhaust manifold and a twelfth exhaust manifold which are connected with cylinders, wherein the first exhaust manifold, the second exhaust manifold and the third exhaust manifold are intersected to form a first cylinder branch pipe, a second cylinder branch pipe and a third cylinder branch pipe, the fourth exhaust manifold, the fifth exhaust manifold and the sixth exhaust manifold are intersected to form a fourth cylinder branch pipe, a fifth cylinder branch pipe and a sixth cylinder branch pipe, the seventh exhaust manifold, the eighth exhaust manifold and the ninth exhaust manifold are intersected to form a seventh cylinder branch pipe, an eighth cylinder branch pipe and a ninth cylinder branch pipe, and the tenth exhaust manifold, the eleventh exhaust manifold and the twelfth exhaust manifold are intersected to form a tenth cylinder branch pipe, an eleventh branch pipe, The exhaust manifold is connected with components such as a silencer, a catalyst or a turbine and the like to form a 3-4-1 exhaust pipeline structure that three exhaust manifolds are converged together, four exhaust branch pipes are converged together and one exhaust manifold is connected with a rear component.

Optionally, the exhaust manifold length is not less than 2 times the cylinder diameter, and the exhaust manifold length difference is less than or equal to 30%.

Optionally, the exhaust branch pipe length is greater than 3 cylinder diameters.

In addition, the application also provides a 3-2-1 exhaust pipeline structure which comprises 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 which are connected with cylinders, wherein the first exhaust manifold, the second exhaust manifold and the third exhaust manifold are intersected to form a first cylinder branch pipe, a second cylinder branch pipe and a third cylinder branch pipe, the fourth exhaust manifold, the fifth exhaust manifold and the sixth exhaust manifold are intersected to form a fourth cylinder branch pipe, a fifth cylinder branch pipe and a sixth cylinder branch pipe, the first cylinder branch pipe, the second cylinder branch pipe and the third cylinder branch pipe are intersected with the fourth cylinder branch pipe, the fifth cylinder branch pipe and the sixth cylinder branch pipe at the inlet of an exhaust main pipe, the exhaust main pipe is connected with a silencer or a catalyst or a turbine, three exhaust manifolds are formed and are converged together, the two exhaust branch pipes are converged together, and one exhaust main pipe is connected with the rear part.

Optionally, the exhaust manifold length is not less than 2 times the cylinder diameter, and the exhaust manifold length difference is less than or equal to 30%.

Optionally, the exhaust branch pipe length is greater than 3 cylinder diameters.

In addition, the application also provides an engine which comprises any one of the multi-group convergent exhaust manifolds.

Compared with the prior art, the method has the following advantages:

the application provides a grouping formula exhaust manifold to 12 jar engines of V type, the interval of igniteing is 60 CA, and exhaust duration is about 240 CA, and among the exhaust process, there are a plurality of jars mutual interference for the exhaust backpressure is high, and the residual exhaust gas coefficient is high in the jar, arranges the temperature height, and the detonation tendency is high, and the order of igniteing of 12 jars of V type is: 1-8-5-10-3-7-6-11-2-9-4-12, the ignition interval of the first cylinder, the second cylinder and the third cylinder is 240 CA, the exhaust duration is about 240 CA, the exhaust manifolds of the first cylinder, the second cylinder and the third cylinder are converged together without mutual interference, the length of the exhaust manifolds of the first cylinder, the second cylinder and the third cylinder is more than 2 times of the diameter of the cylinder, the length of the exhaust branch pipes of the first cylinder, the second cylinder and the third cylinder is more than 3 times of the diameter of the cylinder, so that the interference of the exhaust of other cylinders to the first cylinder, the second cylinder and the third cylinder is small, and so on, the four cylinders, the fifth cylinder and the sixth cylinder are converged together, the seven cylinder, the eight cylinder and the nine cylinder are converged together, the ten cylinder, the eleven cylinder and the twelve cylinder are converged together, and the four exhaust branch pipes are mutually capable of avoiding the interference. So that the scavenging is more sufficient and the exhaust is more smooth.

For an inline 6 cylinder engine, the firing interval is 120 CA, the exhaust duration is 240 CA, and the firing sequence is: 1-5-3-6-2-4, the ignition interval of the first cylinder, the second cylinder and the third cylinder is 240 CA, the exhaust duration is about 240 CA, the exhaust manifolds of the first cylinder, the second cylinder and the third cylinder are converged together and do not interfere with each other, the length of the exhaust manifolds of the first cylinder, the second cylinder and the third cylinder is more than 2 times the diameter of the cylinder, the length of the exhaust branch pipes of the first cylinder, the second cylinder and the third cylinder is more than 3 times the diameter of the cylinder, so that the interference of the exhaust of other cylinders on the first cylinder, the second cylinder and the third cylinder is very small, and by analogy, the four cylinder, the fifth cylinder and the sixth cylinder are converged together to form two exhaust branch pipes which are converged together and can avoid the interference with each other. So that the scavenging is more sufficient and the exhaust is more smooth.

The utility model provides an engine, owing to possess above-mentioned multiunit and converge formula exhaust manifold, consequently can obtain similar beneficial effect, no longer give unnecessary details here.

Drawings

FIG. 1 is a schematic structural diagram of a V-shaped 12-cylinder engine multi-combination exhaust manifold provided in an embodiment of the present application.

FIG. 2 is a schematic diagram of a multi-combination exhaust manifold of an in-line 6 cylinder engine according to an embodiment of the present disclosure.

Wherein like reference numerals in different figures refer to like parts. The exhaust system comprises a one-cylinder exhaust manifold 1, a two-cylinder exhaust manifold 2, a three-cylinder exhaust manifold 3, a four-cylinder exhaust manifold 4, a five-cylinder exhaust manifold 5, a six-cylinder exhaust manifold 6, a one-cylinder, two-cylinder and three-cylinder converging cavity 7, a four-cylinder, five-cylinder and six-cylinder converging cavity 8, a one-cylinder, two-cylinder and three-cylinder exhaust branch pipe 9, a four-cylinder, five-cylinder and six-cylinder exhaust branch pipe 10, a seven-cylinder exhaust manifold 11, an eight-cylinder exhaust manifold 12, a nine-cylinder exhaust manifold 13, a ten-cylinder exhaust manifold 14, an eleven-cylinder exhaust manifold 15, a twelve-cylinder exhaust manifold 16, a seven-cylinder, eight-cylinder and nine-cylinder converging cavity 17, a ten-cylinder, eleven-cylinder and twelve-cylinder converging cavity 18, a seven-cylinder, eight-cylinder and nine-cylinder exhaust branch pipe 19, a ten-cylinder, eleven-cylinder and twelve-cylinder exhaust branch pipe 20, an exhaust branch pipe cavity 21, an exhaust manifold 22, a muffler or a catalyst or a turbine 23 and an exhaust pipe 24.

FIG. 3 is a schematic view of twelve cylinder venting.

FIG. 4 is a six cylinder exhaust schematic.

FIG. 5 is a comparison of pressure fluctuations at the junction chamber of the exhaust branch pipes.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.

The application provides a multi-combination exhaust manifold and an engine, which are used for solving the problem of exhaust interference of the existing V-shaped 12-cylinder machine and the existing in-line 6-cylinder machine.

The application provides a multi-combination exhaust manifold, which comprises a first exhaust manifold, a second exhaust manifold, a third exhaust manifold, a fourth exhaust manifold, a fifth exhaust manifold, a sixth exhaust manifold, a seventh exhaust manifold, an eighth exhaust manifold, a ninth exhaust manifold, a tenth exhaust manifold, an eleventh exhaust manifold and a twelfth exhaust manifold, wherein the first exhaust manifold, the second exhaust manifold and the third exhaust manifold are intersected to form a first branch pipe, a second branch pipe and a third branch pipe, the fourth exhaust manifold, the fifth exhaust manifold and the sixth exhaust manifold are intersected to form a fourth branch pipe, a fifth branch pipe and a sixth branch pipe, the seventh exhaust manifold, the eighth exhaust manifold and the ninth exhaust manifold are intersected to form a seventh branch pipe, an eighth branch pipe and a ninth branch pipe, the tenth exhaust manifold, the eleventh branch pipe and the twelfth branch pipe are intersected to form a tenth branch pipe, an eleventh branch pipe and a twelfth branch pipe, and the first branch pipe, the second branch pipe and the third branch pipe are connected with the fourth branch pipe, the eighth branch pipe and the ninth branch pipe, The five and six cylinder branch pipes, the seven, eight and nine cylinder branch pipes, the ten, eleven and twelve cylinder branch pipes are intersected at the inlet of the exhaust main pipe, the exhaust main pipe is connected with a silencer or a catalytic converter or a turbine and other components to form a 3-4-1 (three exhaust manifolds are converged together, four exhaust branch pipes are converged together, and one exhaust main pipe is connected with a rear component) exhaust pipeline structure, and the exhaust pipeline structure is communicated with the atmospheric environment through an exhaust pipeline after the exhaust main pipe is discharged from the silencer or the catalytic converter or the turbine.

When the exhaust manifold is applied to an in-line 6-cylinder machine, the exhaust manifold comprises 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, wherein the first exhaust manifold, the second exhaust manifold and the third exhaust manifold are intersected to form a first exhaust manifold and a second exhaust manifold, the three-cylinder branch pipe, the fourth exhaust manifold, the fifth exhaust manifold and the sixth exhaust manifold are intersected to form four, five and six cylinder branch pipes, the one, two and three cylinder branch pipes are intersected with the four, five and six cylinder branch pipes at the inlet of an exhaust main pipe, the exhaust main pipe is connected with a silencer or a catalyst or a turbine and other parts to form a 3-2-1 (three exhaust manifolds are converged together, two exhaust branch pipes are converged together, and one exhaust main pipe is connected with the rear part) exhaust pipeline structure, and the exhaust pipeline structure is communicated with the atmospheric environment after the exhaust branch pipes are led out of the silencer or the catalyst or the turbine.

The embodiment of the application divides the V-shaped 12-cylinder machine into four groups, and the in-line 6-cylinder machine divides into two groups, so that three cylinders of each group cannot generate exhaust interference, and on the other hand, the exhaust manifold length and the exhaust branch pipe length are optimized, so that the exhaust passage is reasonably utilized between each group, and the interference is avoided.

The multi-manifold exhaust manifold provided by the embodiments of the present application will be described and illustrated in detail below.

As shown in fig. 1, taking a V-type 12-cylinder engine as an example, the multi-group merged exhaust manifold described in the embodiment of the present application includes: the exhaust system comprises a one-cylinder exhaust manifold 1, a two-cylinder exhaust manifold 2, a three-cylinder exhaust manifold 3, a four-cylinder exhaust manifold 4, a five-cylinder exhaust manifold 5, a six-cylinder exhaust manifold 6, a one-cylinder, two-cylinder and three-cylinder converging cavity 7, a four-cylinder, five-cylinder and six-cylinder converging cavity 8, a one-cylinder, two-cylinder and three-cylinder exhaust branch pipe 9, a four-cylinder, five-cylinder and six-cylinder exhaust branch pipe 10, a seven-cylinder exhaust manifold 11, an eight-cylinder exhaust manifold 12, a nine-cylinder exhaust manifold 13, a ten-cylinder exhaust manifold 14, an eleven-cylinder exhaust manifold 15, a twelve-cylinder exhaust manifold 16, a seven-cylinder, eight-cylinder and nine-cylinder converging cavity 17, a ten-cylinder, eleven-cylinder and twelve-cylinder converging cavity 18, a seven-cylinder, eight-cylinder and nine-cylinder exhaust branch pipe 19, a ten-cylinder, eleven-cylinder and twelve-cylinder exhaust branch pipe 20, an exhaust branch pipe cavity 21, an exhaust manifold 22, a muffler or a catalyst or a turbine 23 and an exhaust pipe 24. Are described below.

With continued reference to fig. 1, the exhaust manifold includes: the engine comprises a one-cylinder exhaust manifold 1, a two-cylinder exhaust manifold 2, a three-cylinder exhaust manifold 3, a four-cylinder exhaust manifold 4, a five-cylinder exhaust manifold 5, a six-cylinder exhaust manifold 6, a seven-cylinder exhaust manifold 11, an eight-cylinder exhaust manifold 12, a nine-cylinder exhaust manifold 13, a ten-cylinder exhaust manifold 14, an eleven-cylinder exhaust manifold 15 and a twelve-cylinder exhaust manifold 16.

The exhaust branch pipe includes: the engine comprises a first cylinder exhaust branch pipe, a second cylinder exhaust branch pipe, a third cylinder exhaust branch pipe 9, a fourth cylinder exhaust branch pipe, a fifth cylinder exhaust branch pipe, a sixth cylinder exhaust branch pipe 10, a seventh cylinder exhaust branch pipe, an eighth cylinder exhaust branch pipe, a ninth cylinder exhaust branch pipe 19, a tenth cylinder exhaust branch pipe, an eleventh cylinder exhaust branch pipe and a twelfth cylinder exhaust branch pipe 20.

The merging chamber includes: a first cylinder converging cavity 7, a second cylinder converging cavity 7, a fourth cylinder converging cavity 8, a fifth cylinder converging cavity 8, a seventh cylinder converging cavity 17, an eighth cylinder converging cavity 17, a tenth cylinder converging cavity 18, an eleventh cylinder converging cavity 18 and a twelfth cylinder converging cavity 21.

The exhaust pipe includes: an exhaust manifold 22, a muffler or catalyst or turbine 23, an exhaust pipe 24.

In the 12 jar machines of V type, V type contained angle is 60 CA (crank angle), and the order of starting a fire is: 1 (1 st cylinder) -8 (8 th cylinder) -5 (5 th cylinder) -10 (10 th cylinder) -3 (3 rd cylinder) -7 (7 th cylinder) -6 (6 th cylinder) -11 (11 th cylinder) -2 (2 nd cylinder) -9 (9 th cylinder) -4 (4 th cylinder) -12 (12 th cylinder), the ignition interval is 60 degrees CA, as shown in figure 1, when in operation, the ignition interval of the first, second and third cylinders is 240 degrees CA, the exhaust duration is about 240 degrees CA, the first cylinder exhaust manifold 1, the second cylinder exhaust manifold 2 and the third cylinder exhaust manifold 3 enter the first, second and third cylinder exhaust branch pipes 9 through the first, second and third cylinder converging cavities 7, and the first, second and third cylinder exhaust manifolds are converged together without mutual interference; the length of the first, second and third cylinder exhaust manifolds is larger than 2 times of the diameter of the cylinder, and the length of the first, second and third cylinder exhaust branch pipes is larger than 3 times of the diameter of the cylinder, so that the interference of other cylinder exhaust on the first, second and third cylinders is small.

By analogy, the ignition intervals of the four cylinders, the five cylinders and the six cylinders are 240 CA degrees, the exhaust duration is about 240 CA degrees, the four-cylinder exhaust manifold 4, the five-cylinder exhaust manifold 5 and the six-cylinder exhaust manifold 6 enter the four-cylinder, five-cylinder and six-cylinder exhaust branch pipes 10 through the four-cylinder, five-cylinder and six-cylinder converging cavities 8, the four-cylinder, five-cylinder and six-cylinder exhaust manifolds are converged together, and the four-cylinder, five-cylinder and six-cylinder exhaust manifolds cannot interfere with each other; the length of the four-cylinder, five-cylinder and six-cylinder exhaust manifolds is larger than 2 times of the diameter of the cylinder, and the length of the four-cylinder, five-cylinder and six-cylinder exhaust branch pipes is larger than 3 times of the diameter of the cylinder, so that the interference of other cylinder exhaust on the four-cylinder, five-cylinder and six-cylinder is very small.

By analogy, the ignition intervals of the seven cylinders, the eight cylinders and the nine cylinders are 240 degrees CA, the exhaust duration is about 240 degrees CA, the seven cylinders exhaust manifolds 11, the eight cylinders exhaust manifolds 12 and the nine cylinders exhaust manifolds 13 enter the seven cylinders, the eight cylinders and the nine cylinders exhaust branch pipes 19 through the seven cylinders, the eight cylinders and the nine cylinders converging cavities 17, the seven cylinders, the eight cylinders and the nine cylinders exhaust manifolds are converged together, and mutual interference among the seven cylinders, the eight cylinders and the nine cylinders exhaust manifolds is avoided; the lengths of the seven, eight and nine cylinder exhaust manifolds are larger than 2 times of the diameters of the cylinders, and the lengths of the seven, eight and nine cylinder exhaust branch pipes are larger than 3 times of the diameters of the cylinders, so that the interference of other cylinder exhaust on the seven, eight and nine cylinders is small.

By analogy, the ignition intervals of the ten cylinders, the eleven cylinders and the twelve cylinders are 240 CA degrees, the exhaust duration is about 240 CA degrees, the ten cylinders of exhaust manifolds 14 and the eleven cylinders of exhaust manifolds 15 are arranged, the twelve cylinders of exhaust manifolds 16 enter the ten cylinders, the eleven cylinders and the twelve cylinders of exhaust branch pipes 20 through ten cylinder converging cavities 18, the ten cylinders, the eleven cylinders and the twelve cylinders of exhaust manifolds are converged together, and mutual interference among the ten cylinders, the eleven cylinders and the twelve cylinders of exhaust manifolds is avoided; the lengths of the ten-cylinder, eleven-cylinder and twelve-cylinder exhaust manifolds are larger than 2 times of the diameters of the cylinders, and the lengths of the ten-cylinder, eleven-cylinder and twelve-cylinder exhaust branch pipes are larger than 3 times of the diameters of the cylinders, so that the interference of other cylinder exhaust on seven, eight and nine cylinders is very small.

The gases discharged from the first, second and third cylinder exhaust branch pipes 9, the fourth, fifth and sixth cylinder exhaust branch pipes 10, the seventh, eighth and ninth cylinder exhaust branch pipes 19, the tenth, eleventh and twelfth cylinder exhaust branch pipes 20 are converged together through an exhaust branch pipe converging cavity 21, and discharged into the atmosphere through an exhaust manifold 22, a muffler or a catalyst or a turbine 23 and an exhaust pipe 24.

Fig. 2 shows a multi-group convergent exhaust manifold structure of an in-line 6-cylinder machine, which will not be described in detail herein.

Through this embodiment, the exhaust interference reduces by a wide margin, and fig. 5 shows the pressure fluctuation condition of exhaust branch pipe confluence cavity department, compares general blast pipe design scheme, and this embodiment has presented 12 wave crests and 12 wave troughs, has realized 12 jar exhaust mutual noninterferences.

In addition, in the embodiment of the present application, the V-shaped included angle is also applicable to other angles, and the embodiment of the present application is not limited to this.

According to the embodiment of the application, the exhaust manifold length and the exhaust branch pipe length are set through grouping the exhaust manifolds, exhaust interference among cylinders is avoided, exhaust back pressure is reduced, the coefficient of residual waste gas in the cylinders is reduced, the knocking tendency is reduced, the exhaust temperature is reduced, and the economy, the dynamic property and the exhaust property are improved.

Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application, and those skilled in the art can make variations and modifications without departing from the spirit and scope of the present application, therefore, the scope of the present application should be determined by the claims that follow.

Claims (7)

1. The multi-group converging type exhaust manifold is applied to a V-shaped 12-cylinder machine and is characterized by comprising a first exhaust manifold, a second exhaust manifold, a third exhaust manifold, a fourth exhaust manifold, a fifth exhaust manifold, a sixth exhaust manifold, a seventh exhaust manifold, an eighth exhaust manifold, a ninth exhaust manifold, a tenth exhaust manifold, an eleventh exhaust manifold and a twelfth exhaust manifold which are connected with cylinders, wherein the first exhaust manifold, the second exhaust manifold and the third exhaust manifold are intersected to form a first cylinder branch pipe, a second cylinder branch pipe and a third cylinder branch pipe, the fourth exhaust manifold, the fifth exhaust manifold and the sixth exhaust manifold are intersected to form a fourth cylinder branch pipe, a fifth cylinder branch pipe and a sixth cylinder branch pipe, the seventh exhaust manifold, the eighth exhaust manifold and the ninth exhaust manifold are intersected to form a seventh cylinder branch pipe, an eighth cylinder branch pipe and a ninth cylinder branch pipe, and the tenth exhaust manifold, the eleventh exhaust manifold and the twelfth exhaust manifold are intersected to form a tenth cylinder branch pipe, The exhaust manifold is connected with components such as a silencer, a catalyst or a turbine, and the like to form a 3-4-1 exhaust pipeline structure that three exhaust manifolds are converged together, four exhaust branch pipes are converged together, and one exhaust manifold is connected with the rear component.

2. The multi-manifold exhaust manifold of claim 1 wherein the exhaust manifold length is no less than 2 cylinder diameters and the exhaust manifold length difference is less than or equal to 30%.

3. The multi-junction exhaust manifold according to claim 1, wherein the exhaust branch pipe length is greater than or equal to 3 cylinder diameters.

4. The multi-manifold exhaust manifold as claimed in claim 1, when applied to an in-line 6 cylinder engine, it is characterized by 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 which are connected with cylinders, the first exhaust manifold, the second exhaust manifold and the third exhaust manifold are intersected to form a first cylinder branch pipe, a second cylinder branch pipe and a third cylinder branch pipe, the fourth exhaust manifold, the fifth exhaust manifold and the sixth exhaust manifold are intersected to form four-cylinder branch pipes, five-cylinder branch pipes and six-cylinder branch pipes, the first, second and third cylinder branch pipes are intersected with the fourth, fifth and sixth cylinder branch pipes at the inlet of the exhaust main pipe, the exhaust main pipe is connected with components such as a silencer or a catalytic converter or a turbine, three exhaust manifolds are formed and converged together, two exhaust branch pipes are converged together, and one exhaust main pipe is connected with a 3-2-1 exhaust pipeline structure of a rear component.

5. The multi-manifold exhaust manifold of claim 4 wherein the exhaust manifold length is no less than 2 cylinder diameters and the exhaust manifold length difference is less than or equal to 30%.

6. The multi-junction exhaust manifold according to claim 4, wherein the exhaust branch pipe length is greater than or equal to 3 cylinder diameters.

7. An engine comprising a multi-manifold exhaust manifold according to any one of claims 1 to 6.

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