CN219034863U - Engine air intake and exhaust system and engine - Google Patents

Abstract

The utility model relates to an engine air intake and exhaust system and an engine, wherein the engine air intake and exhaust system comprises an air intake system and an exhaust system, the air intake system comprises a plurality of turbochargers and intercoolers, compressors of the turbochargers are connected in parallel with the intercoolers through first air intake pipelines, and the intercoolers are connected with air intake structures of a cylinder head through second air intake pipelines; the exhaust system comprises exhaust branch pipes, an exhaust main pipe and exhaust adapter joints, wherein a plurality of exhaust branch pipes are in one-to-one correspondence with each exhaust structure of the cylinder head, at least two exhaust branch pipes are connected in parallel with one exhaust main pipe, at least two exhaust main pipes are connected in parallel with one exhaust adapter joint, and a turbine of each turbocharger is connected with at least one exhaust adapter joint; the engine air inlet and exhaust system can rapidly cope with load change, provide large-flow air matched with fuel oil quantity, ensure full combustion, reduce emission, fully utilize exhaust energy of exhaust gas, and optimize and improve exhaust performance and overall performance of the engine.

Description

Engine air intake and exhaust system and engine

Technical Field

The utility model relates to the technical field of engines, in particular to an engine air intake and exhaust system and an engine.

Background

The main technical scheme of the current diesel engine for reducing emission is that the air intake adopts a two-stage supercharging system, the two-stage supercharging system adopts a mode of connecting high-pressure and low-pressure two-stage supercharger air paths in series, as shown in fig. 1, air is pressurized by a low-pressure stage supercharger 01, cooled by an inter-stage cooler 02 and then enters a high-pressure stage supercharger 03 for second-stage pressurization, and then is cooled again by an intercooler 04 of a diesel engine 05 and enters a cylinder for combustion. The two-stage supercharging system can realize very high supercharging pressure ratio, greatly improves the air inflow of the diesel engine 05, improves the in-cylinder combustion quality, reduces the combustion temperature and reduces the emission of the diesel engine 05, but has more parts and complex structure, comprises a high-pressure stage supercharger 03, a low-pressure stage supercharger 01, an interstage cooler 02, a connecting pipeline and the like, occupies large space, is difficult to arrange on the diesel engine, and has high manufacturing and application costs.

Disclosure of Invention

A first object of the present utility model is to provide an engine intake and exhaust system that simplifies the structure, reduces the occupied space, facilitates the layout, and reduces the manufacturing and operating costs.

The second object of the utility model is to provide an engine comprising the engine air intake and exhaust system.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

an engine air intake and exhaust system, engine air intake and exhaust system includes cylinder body and cylinder head, the cylinder body with the cylinder head encloses into a plurality of cylinders, correspond every on the cylinder head the cylinder is provided with air intake structure and exhaust structure respectively, engine air intake and exhaust system includes:

the air inlet system comprises an intercooler and a plurality of turbochargers, the outlet of the air compressor of each turbocharger is connected in parallel with the inlet of the intercooler through a first air inlet pipeline, and the outlet of the intercooler is connected with each air inlet structure of the cylinder head through a second air inlet pipeline;

the exhaust system comprises exhaust branch pipes, an exhaust manifold and an exhaust adapter, wherein the inlets of a plurality of the exhaust branch pipes are connected with the exhaust structures on the cylinder covers in a one-to-one correspondence manner, at least two exhaust branch pipes are in a group, the outlets of the exhaust branch pipes in the same group are connected in parallel with the inlet of the exhaust manifold, at least two exhaust manifold are in a group, the outlets of the exhaust manifold in the same group are connected in parallel with the inlet of the exhaust adapter, and the inlet of a turbine of each turbocharger is connected with the outlet of at least one exhaust adapter.

Optionally, the cylinders are arranged in a straight line, each cylinder is in a group, each group of cylinders is symmetrically arranged about the same symmetry plane, the symmetry plane is perpendicular to the arrangement direction of each cylinder, and two exhaust branch pipes communicated with the exhaust structures of two cylinders in the same group are connected in parallel to an inlet of the exhaust manifold.

Optionally, the air inlet system comprises an air filter, and the air filter is respectively arranged at the inlet of the compressor of each turbocharger.

Optionally, the air intake system further includes a mounting bracket, and the intercooler, each compressor of the turbocharger, and each air filter are respectively disposed on the mounting bracket.

Optionally, the inlets of the turbines of the turbochargers are connected in one-to-one correspondence with the outlets of the exhaust gas adapters.

Optionally, each of the exhaust branch pipes and each of the exhaust manifolds extend to the same side of the cylinder head so that each of the exhaust manifolds is correspondingly connected to each of the exhaust adapters located on the same side of the cylinder head.

Optionally, a limiting and fixing structure is arranged between two adjacent exhaust branch pipes, between two adjacent exhaust manifolds or between two adjacent exhaust branch pipes and the exhaust manifolds.

Optionally, the exhaust branch pipes are connected with the exhaust main pipe, the exhaust main pipe and the exhaust adapter or two exhaust branch pipes in the same group through telescopic corrugated pipes.

An engine comprising an engine intake and exhaust system as claimed in any preceding claim.

Optionally, the fuel system of the engine comprises:

the electronic control unit fuel injection pumps are arranged in one-to-one correspondence with all cylinders of an air inlet and exhaust system of the engine, and an electronic control valve is arranged at the outlet end of each electronic control unit fuel injection pump;

the outlet end of the electric control unit fuel injection pump is communicated with the fuel injector through the electric control valve and the high-pressure oil pipe;

the injection controller is in communication connection with each of the electric control unit fuel injection pumps, and is used for controlling the injection time and the injection quantity of each of the electric control unit fuel injection pumps according to a preset instruction according to the rotation speed and the load condition of the engine.

According to the technical scheme, the utility model discloses an engine air intake and exhaust system, which comprises a cylinder body and a cylinder cover, wherein the cylinder body and the cylinder cover enclose a plurality of cylinders, an air intake structure and an exhaust structure are respectively arranged on the cylinder cover corresponding to each cylinder, the engine air intake and exhaust system also comprises an air intake system and an exhaust system, wherein the air intake system comprises an intercooler and a plurality of turbochargers, the outlet of the air compressor of each turbocharger is connected in parallel with the inlet of the intercooler through a first air intake pipeline, and the outlet of the intercooler is connected with each air intake structure of the cylinder cover through a second air intake pipeline; the exhaust system comprises exhaust branch pipes, exhaust manifolds and exhaust adapter joints, wherein the inlets of the exhaust branch pipes are in one-to-one correspondence with the exhaust structures on the cylinder covers, at least two exhaust branch pipes are in one group, the outlets of the exhaust branch pipes of the same group are connected in parallel with the inlet of one exhaust manifold, at least two exhaust manifolds are in one group, the outlets of the exhaust manifolds of the same group are connected in parallel with the inlet of one exhaust adapter joint, and the inlet of a turbine of each turbocharger is connected with the outlet of at least one exhaust adapter joint.

When the engine is applied, the compressors of the multiple turbochargers respectively pressurize and boost air sucked from the atmosphere, the pressurized air enters the intercooler through the respective first air inlet pipelines, all the air is converged and mixed in the intercooler and finally is conveyed to all cylinders of the engine, the parallel structure of the multiple compressors enables the compressors with smaller volume and mass to achieve larger air flow, the rotary inertia of a rotary part in the small compressor is small, the dynamic response is good, therefore, the change of engine load can be rapidly handled, the air quantity matched with the fuel quantity can be provided under various operation conditions, the full combustion in the cylinders is ensured, the emission is reduced, the parallel scheme is not required, the system resistance is small, the system configuration is simple, the space occupation is small, the arrangement is convenient, the manufacturing and operating cost can be reduced, meanwhile, the exhaust system is in a grouping and optimizing combination according to the ignition sequence and the arrangement condition of the cylinders of the engine cylinders, the exhaust branch pipes and the exhaust manifold, the exhaust interference between all the cylinders is avoided, the pulse energy of each cylinder can be fully utilized, the pulse energy of the turbine can be guaranteed, the continuous energy of the turbine can be ensured, the exhaust turbine can be continuously designed, the exhaust system can be conveniently and the exhaust system is stably maintained, the exhaust system has the advantages of the exhaust system has high performance, the exhaust system has the advantages of the exhaust system has the performance and the exhaust system is stable, and the exhaust system has the performance of the exhaust system is conveniently and high in the stage and is well-up and stable, and the stage-up.

The utility model also provides an engine, which comprises the engine air inlet and outlet system, and the engine with the engine air inlet and outlet system has the same beneficial effects as the engine air inlet and outlet system.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art two-stage supercharging system;

FIG. 2 is a schematic diagram of a prior art high pressure common rail injection system;

fig. 3 is a front view of an air intake system of an air intake and exhaust system of an engine according to an embodiment of the present utility model;

fig. 4 is a top view of an air intake system of an air intake and exhaust system of an engine according to an embodiment of the present utility model;

fig. 5 is a front view of an exhaust system of an engine intake and exhaust system according to an embodiment of the present utility model;

FIG. 6 is a top view of an exhaust system of an engine exhaust and intake system according to an embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a fuel system of an engine according to an embodiment of the present utility model.

In fig. 1 and 2:

01 is a low-pressure stage supercharger; 02 is an inter-stage cooler; 03 is a high pressure stage booster; 04 is an intercooler; 05 is a diesel engine; 06 is a high-pressure oil pump; reference numeral 07 denotes a common rail pipe; 08 is an electric control fuel injector; 09 is an electronic controller;

fig. 3 to 7:

1 is a turbocharger; 2 is a first air inlet pipeline; 3 is an intercooler; 4 is an air filter; 5 is a mounting bracket; 6. 601, 602, 603, 604, 605, 606, 607, 608 are exhaust branch pipes; 7. 701, 702, 703, 704 are exhaust manifolds; 8. 801, 802 are exhaust adapters; 9 is a connecting plate; 10 is an electric control unit fuel injection pump; 11 is an electric control valve; 12 is a high pressure oil pipe; 13 is an oil injector; 14 are injection controllers.

Detailed Description

One of the cores of the utility model is to provide an engine air intake and exhaust system, which has the advantages of simplified structure, small occupied space, convenient arrangement and reduced manufacturing and application cost due to the structural design.

The utility model further provides an engine based on the engine air inlet and exhaust system.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 3 to 6, fig. 3 is a front view of an air intake system of an air intake and exhaust system of an engine according to an embodiment of the present utility model, fig. 4 is a top view of an air intake system of an air intake and exhaust system of an engine according to an embodiment of the present utility model, fig. 5 is a front view of an exhaust system of an air intake and exhaust system of an engine according to an embodiment of the present utility model, and fig. 6 is a top view of an exhaust system of an air intake and exhaust system of an engine according to an embodiment of the present utility model.

The embodiment of the utility model discloses an engine air inlet and exhaust system, which comprises a cylinder body and a cylinder cover, wherein the cylinder body and the cylinder cover enclose a plurality of cylinders, an air inlet structure and an air exhaust structure are respectively arranged on the cylinder cover corresponding to each cylinder, and the engine air inlet and exhaust system also comprises an air inlet system and an air exhaust system.

The air inlet system comprises an intercooler 3 and a plurality of turbochargers 1, wherein the outlet of a compressor of each turbocharger 1 is connected in parallel with the inlet of the intercooler 3 through a first air inlet pipeline 2, and the outlet of the intercooler 3 is connected with each air inlet structure of the cylinder cover through a second air inlet pipeline; the exhaust system comprises exhaust branch pipes 6, an exhaust main pipe 7 and an exhaust adapter 8, wherein the inlets of the exhaust branch pipes 6 are in one-to-one correspondence with each exhaust structure on the cylinder cover, at least two exhaust branch pipes 6 are in one group, the outlets of the exhaust branch pipes 6 of the same group are connected in parallel with the inlet of one exhaust main pipe 7, at least two exhaust main pipes 7 are in one group, the outlets of the exhaust main pipes 7 of the same group are connected in parallel with the inlet of one exhaust adapter 8, and the inlet of a turbine of each turbocharger 1 is connected with the outlet of at least one exhaust adapter 8.

In summary, compared with the prior art, when the engine intake and exhaust system provided by the embodiment of the utility model is applied, the compressors of the multiple turbochargers 1 respectively pressurize and boost the air sucked from the atmosphere, the pressurized air enters the intercooler 3 through the respective first air inlet pipeline 2, the air in each path is converged and mixed in the intercooler 3 and finally is conveyed to each cylinder of the engine, the multiple compressors are in parallel connection, so that the multiple compressors can adopt the compressors with smaller volume and mass to realize larger air flow, the rotational inertia of the rotary parts in the small compressors is small, the dynamic response is good, the change of the engine load can be rapidly responded, the air quantity matched with the fuel quantity can be provided under various operation conditions, the full combustion in the cylinders is ensured, the emission is reduced, the parallel scheme does not need an inter-stage cooler and corresponding pipelines, so that the system resistance is small, the system configuration is simple, the space occupation is small, the arrangement is convenient, the manufacturing and application cost can be reduced, meanwhile, the exhaust system performs grouping optimization combination on the exhaust branch pipe 6 and the exhaust manifold 7 according to the ignition sequence and the cylinder arrangement condition of the engine cylinders, so as to avoid exhaust interference among all cylinders, and the pulse energy of the exhaust of all cylinders can be fully utilized to ensure that the turbine of the turbocharger 1 continuously obtains the exhaust energy, thereby being beneficial to the stable and efficient operation of the turbocharger 1, optimizing the exhaust performance, further improving the engine performance, and the exhaust system adopts the three-stage hierarchical design consisting of the exhaust branch pipe 6, the exhaust manifold 7 and the exhaust conversion head, thereby being beneficial to reducing the complexity of the system and parts and being convenient to maintain.

Preferably, in one embodiment of the present utility model, each cylinder is arranged in a straight line, each cylinder is in a group, each group of cylinders is symmetrically arranged about the same symmetry plane, the symmetry plane is perpendicular to the arrangement direction of each cylinder, and two exhaust branch pipes 6 communicated with the exhaust structures of two cylinders in the same group are a group of inlets connected in parallel to one exhaust manifold 7.

Further optimizing the above technical solution, in the embodiment of the present utility model, the inlet of the turbine of the turbocharger 1 is connected with the outlet of the exhaust adaptor 8 in a one-to-one correspondence.

Taking an eight-cylinder engine as an example, as shown in fig. 5 and 6, 8 exhaust branch pipes 6 are combined into 4 groups every 2 groups, each exhaust branch pipe 6 of each group is connected with one exhaust manifold 7, the combination mode is that the exhaust branch pipe 601 and the exhaust branch pipe 608 which are correspondingly connected with the first cylinder and the eighth cylinder at the two ends of the engine cylinder group are the first group, the group of exhaust branch pipes 6 is connected with the exhaust manifold 701 in parallel, the exhaust branch pipe 602 and the exhaust branch pipe 607 which are correspondingly connected with the second cylinder and the seventh cylinder of the engine cylinder group are the second group, the group of exhaust branch pipes 6 is connected with the exhaust manifold 702 in parallel, the exhaust branch pipe 603 and the exhaust branch pipe 606 which are correspondingly connected with the third cylinder and the sixth cylinder of the engine cylinder group are the third group, the group of the exhaust branch pipe 6 is connected with the exhaust manifold 703 in parallel, the exhaust branch pipe 604 and the exhaust branch pipe 605 which are correspondingly connected with the fourth cylinder and the fifth cylinder of the engine cylinder group are the fourth group, and the group of the exhaust branch pipe 6 is connected with the exhaust manifold 704 in parallel; the four exhaust manifolds 7 of the exhaust manifold 701, the exhaust manifold 702, the exhaust manifold 703 and the exhaust manifold 704 are subdivided into 2 groups for every 2 groups, wherein the exhaust manifold 701 and the exhaust manifold 702 are in one group, the group of the exhaust manifolds 7 is connected in parallel with the exhaust adaptor 801, the exhaust manifold 703 and the exhaust manifold 704 are in one group, the group of the exhaust manifolds 7 is connected in parallel with the exhaust adaptor 802, and the two exhaust adaptors 801 and 802 are respectively connected with the exhaust inlets of the turbines of the two turbochargers 1.

As shown in fig. 5 and 6, in the embodiment of the present utility model, each exhaust branch pipe 6 and each exhaust manifold 7 extend toward the same side of the cylinder head so that each exhaust manifold 7 is connected to each exhaust adapter 8 located on the same side of the cylinder head.

As shown in fig. 6, in the embodiment of the present utility model, in order to ensure stability of the exhaust system, a limiting and fixing structure is provided between two adjacent exhaust branch pipes 6, between two adjacent exhaust manifolds 7 or between two adjacent exhaust branch pipes 6 and an exhaust manifold 7, specifically, in the design and installation process, according to the relative positions of each exhaust branch pipe 6 and each exhaust manifold 7, mounting bosses are provided at suitable positions of two adjacent exhaust branch pipes 6, two adjacent exhaust manifolds 7 or two adjacent exhaust branch pipes 6 and the exhaust manifold 7, threaded holes are provided on the mounting bosses, the mounting bosses of two adjacent exhaust branch pipes 6, the mounting bosses of two adjacent exhaust manifolds 7 or the mounting bosses of two adjacent exhaust branch pipes 6 and the exhaust manifold 7 are fixedly connected through a connecting plate 9, through holes are provided on the connecting plate 9, and fastening bolts pass through the through holes to be matched with threaded holes, so as to fix the two adjacent exhaust branch pipes 6, two adjacent exhaust manifolds 7 or two adjacent exhaust branch pipes 6 and the exhaust manifold 7 relatively.

As shown in fig. 6, in order to facilitate production and installation, in the embodiment of the present utility model, the exhaust branch pipe 6 is connected to the exhaust manifold 7, the exhaust manifold 7 is connected to the exhaust adaptor 8, or two exhaust branch pipes 6 in the same group through a telescopic bellows, which can compensate for machining errors, so that the connection between the exhaust branch pipe 6 and the exhaust manifold 7, between the exhaust manifold 7 and the exhaust adaptor 8, or between two exhaust branch pipes 6 in the same group is facilitated, and it can be seen from the figure that some exhaust branch pipes 6 are not directly connected to the exhaust manifold 7, but are connected to the exhaust manifold 7 by means of a confluence section of another exhaust branch pipe 6 in the same group.

As shown in fig. 3 and 4, in the embodiment of the present utility model, the intake system includes an air filter 4, and the air filters 4 are provided at the inlets of the compressors of the respective turbochargers 1, respectively.

In order to improve the compactness of the air intake system, reduce the space occupation and facilitate the arrangement, in the embodiment of the present utility model, as shown in fig. 3 and 4, the air intake system further includes a mounting bracket 5, and the intercooler 3, the compressor of each turbocharger 1 and each air filter 4 are respectively disposed on the mounting bracket 5.

The embodiment of the utility model also provides an engine, which comprises the engine air inlet and exhaust system according to the embodiment, and the engine adopts the engine air inlet and exhaust system according to the embodiment, so that the technical effect of the engine is that the engine is referred to the embodiment.

As shown in fig. 2, another main technical scheme of reducing emission of the current engine is to adopt a high-pressure common rail electric control fuel injection system, the high-pressure common rail electric control fuel injection system lifts fuel to high pressure by a high-pressure oil pump, then the fuel is conveyed into a common rail pipe, stable high-pressure fuel pressure is kept in the common rail pipe, the common rail pipe is respectively connected with electric control fuel injectors 13 of all cylinders, and an Electronic Control Unit (ECU) directly controls the electric control fuel injectors 13 to inject fuel. The fuel atomized oil drops sprayed out by the high-pressure common rail electric control fuel injection system are finer and are uniformly mixed with air, so that the combustion quality in an engine cylinder is improved, and the emission of the engine is reduced. Meanwhile, the fuel pressure is not influenced by the rotation speed and the power of the engine in the injection process, and good fuel injection quality can be maintained at low speed and low load of the engine, but because the fuel pressure is high, the high-pressure parts in the system are more, the whole system from the high-pressure oil pump to the common rail pipe and then to the electric control oil injector 13 is always in a high-pressure state, the duration is long, the sealing difficulty da Yi is high, the requirements on the materials, the processing and the assembly precision of all parts are very high, and the manufacturing and the application cost of the system are high.

In order to solve the above-mentioned problems, as shown in fig. 7, in the embodiment of the present utility model, the fuel system of the above-mentioned engine includes an electric control unit fuel injection pump 10, a fuel injector 13 and an injection controller 14, wherein the electric control unit fuel injection pump 10 is arranged in one-to-one correspondence with each cylinder of the intake and exhaust system of the engine, and an electric control valve 11 is arranged at the outlet end of the electric control unit fuel injection pump 10; the fuel injector 13 is arranged in each cylinder, and the outlet end of the electric control unit fuel injection pump 10 is communicated with the fuel injector 13 through the electric control valve 11 and the high-pressure fuel pipe 12; the injection controller 14 is in communication connection with each electric control unit fuel injection pump 10, and the injection controller 14 is used for controlling the injection time and the injection quantity of each electric control unit fuel injection pump 10 according to the rotation speed and the load condition of the engine and preset instructions, so that the injection time and the injection quantity of each electric control unit fuel injection pump 10 are controlled and driven by the injection controller 14 of the engine through installing one electric control unit fuel injection pump 10 on each cylinder of the engine, the oil supply parameters of the engine under different rotation speeds and different load conditions can be adjusted and set, the performance optimization under each condition is realized, and the emission of the engine is reduced.

The engine can be a diesel engine, further can be a marine diesel engine, and when the engine is a marine diesel engine and adopts the air inlet and outlet system and the fuel system, the engine can obtain excellent performance and meet the requirements of the emission standard of China two stages of the marine diesel engine.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

It should be appreciated that the terms "system," "apparatus," "unit," and/or "module," if used herein, are merely one method for distinguishing between different components, elements, parts, portions, or assemblies at different levels. However, if other words can achieve the same purpose, the word can be replaced by other expressions.

As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not specific to the singular, but may include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus. The inclusion of an element defined by the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises an element.

Wherein, in the description of the embodiments of the present application, "/" means or is meant unless otherwise indicated, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" means two or more than two.

The terms "first" and "second" are used below 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

If a flowchart is used in the present application, the flowchart is used to describe the operations performed by the system according to embodiments of the present application. It should be appreciated that the preceding or following operations are not necessarily performed in order precisely. Rather, the steps may be processed in reverse order or simultaneously. Also, other operations may be added to or removed from these processes.

It should also be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or apparatus that comprises such element.

The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the utility model. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (10)

1. An engine air intake and exhaust system, engine air intake and exhaust system includes cylinder body and cylinder head, the cylinder body with the cylinder head encloses into a plurality of cylinders, correspond every on the cylinder head the cylinder is provided with air intake structure and exhaust structure respectively, its characterized in that, engine air intake and exhaust system includes:

the air inlet system comprises an intercooler and a plurality of turbochargers, the outlet of the air compressor of each turbocharger is connected in parallel with the inlet of the intercooler through a first air inlet pipeline, and the outlet of the intercooler is connected with each air inlet structure of the cylinder head through a second air inlet pipeline;

the exhaust system comprises exhaust branch pipes, an exhaust manifold and an exhaust adapter, wherein the inlets of a plurality of the exhaust branch pipes are connected with the exhaust structures on the cylinder covers in a one-to-one correspondence manner, at least two exhaust branch pipes are in a group, the outlets of the exhaust branch pipes in the same group are connected in parallel with the inlet of the exhaust manifold, at least two exhaust manifold are in a group, the outlets of the exhaust manifold in the same group are connected in parallel with the inlet of the exhaust adapter, and the inlet of a turbine of each turbocharger is connected with the outlet of at least one exhaust adapter.

2. The intake and exhaust system of claim 1, wherein each of the cylinders is arranged in a straight line, each of the cylinders is arranged in a pair, each of the cylinders is arranged symmetrically about a same symmetry plane, the symmetry plane is perpendicular to an arrangement direction of each of the cylinders, and two of the exhaust branch pipes communicating with the exhaust structures of two of the cylinders of the same group are arranged in a group connected in parallel to an inlet of one of the exhaust manifolds.

3. The engine intake and exhaust system of claim 1, wherein the intake system includes an air filter, the air filter being disposed at an inlet of a compressor of each of the turbochargers.

4. The engine intake and exhaust system of claim 3, further comprising a mounting bracket, wherein the intercooler, the compressor of each turbocharger, and each air filter are disposed on the mounting bracket, respectively.

5. The engine intake and exhaust system according to any one of claims 1-4, wherein the turbine inlet of the turbocharger is connected in one-to-one correspondence with the exhaust adaptor outlet.

6. The engine intake and exhaust system according to any one of claims 1 to 4, wherein each of the exhaust branch pipes and each of the exhaust manifolds extend toward the same side of the cylinder head so that each of the exhaust manifolds is connected to each of the exhaust adapters located on the same side of the cylinder head.

7. The engine intake and exhaust system according to claim 6, wherein a limit fixing structure is provided between two adjacent exhaust branch pipes, between two adjacent exhaust manifolds, or between two adjacent exhaust branch pipes and the exhaust manifold.

8. The engine intake and exhaust system according to any one of claims 1 to 4 and 7, wherein the exhaust branch pipe and the exhaust manifold, the exhaust manifold and the exhaust adaptor, or the two exhaust branch pipes of the same group are connected by a telescopic bellows.

9. An engine comprising an engine intake and exhaust system according to any one of claims 1 to 8.

10. The engine of claim 9, wherein the engine fuel system comprises:

the electronic control unit fuel injection pumps are arranged in one-to-one correspondence with all cylinders of an air inlet and exhaust system of the engine, and an electronic control valve is arranged at the outlet end of each electronic control unit fuel injection pump;

the outlet end of the electric control unit fuel injection pump is communicated with the fuel injector through the electric control valve and the high-pressure oil pipe;

the injection controller is in communication connection with each of the electric control unit fuel injection pumps, and is used for controlling the injection time and the injection quantity of each of the electric control unit fuel injection pumps according to a preset instruction according to the rotation speed and the load condition of the engine.

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