CN112253338A - Integrated gas common rail structure and engine - Google Patents

Abstract

The invention relates to the technical field of fuel gas supply of engines, and discloses an integrated fuel gas common rail structure and an engine, wherein the integrated fuel gas common rail structure comprises: a storage portion defining a storage chamber therein; the gas inlet valve assembly is arranged at one end of the storage part and can introduce gas into the storage cavity when being opened; the air supply valve assemblies are distributed along the length direction of the storage part and define an air supply cavity therein, and the air supply cavity is communicated with the storage cavity and the air cylinder when the air supply valve assemblies are opened; and the purging valve assembly is arranged at the other end of the storage part and can purge the storage cavity and the gas supply cavity when the purging valve assembly is opened. The integrated gas common rail structure disclosed by the invention integrates the storage part, the gas inlet valve component, the at least two gas supply valve components and the purging valve component into a whole, has a simple structure and a small volume, can simultaneously supply gas for at least two cylinders of an engine, and the purging valve component can purge residual gas in the storage cavity and the gas supply cavity, so that explosion caused by mixing of the gas and the air is avoided, and the safety is higher.

Description

Integrated gas common rail structure and engine

Technical Field

The invention relates to the technical field of fuel gas supply of engines, in particular to an integrated fuel gas common rail structure and an engine.

Background

For the existing gas-type engines, each engine comprises at least two cylinders and at least two gas supply assemblies, one gas supply assembly supplies gas for one cylinder, and the structure of the engine is complex and the volume of the engine is large.

Disclosure of Invention

Based on the above, the invention aims to provide an integrated gas common rail structure and an engine, which solve the problems of complex structure and large volume of the engine in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

an integrated gas common rail structure comprising: a storage portion defining a storage chamber therein; the gas inlet valve assembly is arranged at one end of the storage part and can introduce gas into the storage cavity when being opened; the air supply valve components are distributed along the length direction of the storage part, an air supply cavity is defined in each air supply valve component, and when the air supply valve components are opened, the air supply cavities are communicated with the storage cavity and the air cylinder; and the purging valve assembly is arranged at the other end of the storage part and can purge the storage cavity and the air supply cavity when the purging valve assembly is opened.

As a preferred scheme of the integrated gas common rail structure, the storage part is provided with at least two gas outlets, each gas outlet is respectively communicated with one gas supply cavity, each gas supply valve assembly comprises a gas inlet communicating valve, when the gas inlet communicating valve is opened, the gas outlet is communicated with the storage cavity through the gas supply cavity, and when the gas inlet communicating valve is closed, the gas outlet is isolated from the storage cavity.

As a preferable aspect of the integrated gas common rail structure, each of the gas supply valve assemblies further includes an intake control valve for controlling opening and closing of the intake communication valve, and the intake communication valve includes: the air inlet valve block is arranged on the storage part and is provided with an installation cavity and the air supply cavity; the air inlet control valve controls the air inlet communication valve to be opened, hydraulic oil entering the oil cavity can push the valve core assembly to move towards a direction deviating from the oil cavity, and the storage cavity is communicated with the air supply cavity; the elastic piece is sleeved on the valve core assembly, one end of the elastic piece is connected with the valve core assembly, the other end of the elastic piece is connected with the air inlet valve block, when the air inlet communicating valve is controlled by the air inlet control valve to be closed, hydraulic oil in the oil cavity flows out, the elastic piece resets the valve core assembly, and the air supply cavity is isolated from the storage cavity.

As an optimal scheme of an integrated gas common rail structure, the valve core assembly comprises a piston assembly and a valve rod, the piston assembly is fixedly arranged at one end of the valve rod and is in sealing sliding connection with the air inlet valve block, and the elastic piece is sleeved on the valve rod.

As an optimal scheme of the integrated gas common rail structure, a communicated purging port and a communicated channel are arranged on the storage part, the communicated channel is communicated with the storage cavity and each gas supply cavity respectively, and the communicated channel is provided with the purging valve component.

As an integrated form gas common rail structure's preferred scheme, the intercommunication passageway includes first intercommunication passageway and second intercommunication passageway, first intercommunication passageway respectively with purge mouthful and every the air feed chamber intercommunication, the one end of second intercommunication passageway with first intercommunication passageway intercommunication, the other end with the storage chamber intercommunication.

As a preferable scheme of the integrated gas common rail structure, the purge valve assembly includes a purge control valve and a purge communication valve, and the purge control valve is used for controlling the opening or closing of the purge communication valve so as to connect or disconnect the gas supply chamber or the storage chamber with or from the purge port.

As a preferred scheme of the integrated gas common rail structure, the number of the purge communication valves is two, the two purge communication valves are respectively a first purge communication valve and a second purge communication valve, the first purge communication valve is arranged at a junction of the first communication channel and the second communication channel, and the second purge communication valve is arranged on the first communication channel.

As a preferable aspect of the integrated gas common rail structure, the first purge communication valve and the second purge communication valve are sequentially distributed in a flow direction of the purge gas.

An engine, includes at least two cylinders and above any scheme integrated form gas common rail structure, every the cylinder with one the air feed chamber intercommunication.

The invention has the beneficial effects that: the integrated gas common rail structure disclosed by the invention integrates the storage part, the air inlet valve component, the at least two air supply valve components and the purging valve component into a whole, has a simple structure and a small volume, can simultaneously supply air for at least two cylinders of an engine, and can purge residual gas in the storage cavity and the air supply cavity by the purging valve component, so that explosion caused by mixing of the gas and the air is avoided, and the integrated gas common rail structure has higher safety.

The engine disclosed by the invention can simultaneously provide gas for at least two cylinders, and compared with the existing engine, the engine has the advantages of simple structure, small volume and high safety.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and 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 contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic diagram of an integrated gas common rail configuration provided by an embodiment of the present invention;

FIG. 2 is a longitudinal cross-sectional view of an integrated gas common rail structure provided by an embodiment of the present invention;

fig. 3 is a transverse cross-sectional view of an integrated gas common rail structure provided in an embodiment of the present invention.

In the figure:

1. a storage unit; 101. a storage chamber; 102. an air outlet; 103. a purge port; 104. a communication channel; 1041. a first communicating passage; 1042. a second communicating passage;

2. an intake valve assembly;

3. a gas supply valve assembly; 30. a gas supply cavity; 31. an intake communicating valve; 311. an intake valve block; 3111. a first intake valve block; 3112. a second intake valve block; 312. a valve core assembly; 3121. a piston assembly; 3122. a valve stem; 313. an elastic member; 32. an air intake control valve;

4. a purge valve assembly; 41. a purge control valve; 421. a first purge communication valve; 422. a second purge communication valve.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 3, the present embodiment provides an integrated gas common rail structure, which includes a storage portion 1, an inlet valve assembly 2, four inlet valve assemblies 3, and a purge valve assembly 4, a storage chamber 101 is defined in the storage portion 1, the inlet valve assembly 2 is disposed at one end of the storage portion 1, and gas can be introduced into the storage chamber 101 when the inlet valve assembly 2 is opened, the four inlet valve assemblies 3 are distributed along a length direction of the storage portion 1, and an air supply chamber 30 is defined in the inlet valve assembly 3, the air supply chamber 30 communicates with the storage chamber 101 and a cylinder when the inlet valve assembly 3 is opened, and the purge valve assembly 4 is disposed at the other end of the storage portion 1, and can purge the storage chamber 101 and the air supply chamber 30 when the purge valve assembly 4.

It should be noted that the air intake valve assembly 2 may be a manually operated or electrically controlled air intake valve, both of which are well known in the art and are specifically commercially available and will not be described herein. In other embodiments, the number of the supply valve assemblies 3 is not limited to four in the present embodiment, and may be two, three, or more than four, specifically, according to the number of cylinders of the engine.

The integrated gas common rail structure provided by the embodiment integrates the storage part 1, the air inlet valve component 2, the four air supply valve components 3 and the purging valve component 4, is simple in structure and small in size, can supply air for four cylinders of an engine simultaneously, and the purging valve component 4 can purge residual gas in the storage cavity 101 and the air supply cavity 30, so that explosion caused by mixing of the gas and the air is avoided, and the integrated gas common rail structure has high safety.

Specifically, as shown in fig. 1, the storage portion 1 of the present embodiment is provided with four air outlets 102, each air outlet 102 is respectively communicated with one air supply chamber 30, each air supply valve assembly 3 includes an air inlet communication valve 31, the air outlet 102 is communicated with the storage chamber 101 through the air supply chamber 30 when the air inlet communication valve 31 is opened, and the air outlet 102 is isolated from the storage chamber 101 when the air inlet communication valve 31 is closed.

Specifically, the intake communication valve 31 of the present embodiment is a mechanical communication valve, and as shown in fig. 3, each of the intake valve assemblies 3 further includes an intake control valve 32 and a hydraulic line assembly (not shown in the drawings), and the intake control valve 32 is configured to control the opening and closing of the intake communication valve 31 by controlling the flow direction of the hydraulic oil in the hydraulic line assembly. As shown in fig. 3, the intake communicating valve 31 includes an intake valve block 311, a valve core assembly 312 and an elastic member 313, the elastic member 313 is a spring, the intake valve block 311 is disposed on the storage portion 1, the intake valve block 311 is provided with a mounting cavity (not shown) and an air supply cavity 30, one end of the valve core assembly 312 is located in the mounting cavity and forms an oil cavity with the intake valve block 311, the other end of the valve core assembly 312 is located outside the intake valve block 311 and can abut against an end of the intake valve block 311 to isolate the air supply cavity 30 from the storage cavity 101, when the intake communicating valve 31 is opened by the intake control valve 32, hydraulic oil in the hydraulic pipeline assembly enters the oil cavity, the hydraulic oil entering the oil cavity can push the valve core assembly 312 to move towards a direction away from the oil cavity, the storage cavity 101 is communicated with the air supply cavity 30, the elastic member 313 is sleeved on the valve core assembly 312, one end of the elastic member 313 is connected to the valve core assembly 312, when the air inlet control valve 32 controls the air inlet communicating valve 31 to be closed, the hydraulic oil in the oil cavity flows back into the hydraulic pipeline assembly, the elastic piece 313 resets the valve core assembly 312, and the air supply cavity 30 is isolated from the storage cavity 101.

Further, as shown in fig. 2, the intake valve block 311 includes a first intake valve block 3111 and a second intake valve block 3112 which are fixedly disposed, the mounting cavity includes a first mounting cavity and a second mounting cavity which are communicated with each other, the first mounting cavity is located in the first intake valve block 3111, the second mounting cavity is located in the second intake valve block 3112, as shown in fig. 3, the valve core assembly 312 includes a piston assembly 3121 and a valve stem 3122, the piston assembly 3121 is located in the first mounting cavity and is in sliding sealing connection with the first intake valve block 3111, one end of the valve stem 3122 penetrates through the second mounting cavity and is fixedly connected with the piston assembly 3121, the elastic member 313 is sleeved on the valve stem 3122 and is located in the second mounting cavity, and the other end of the valve stem 3122 is located outside the second intake valve block 3112 and can abut against an end of the second intake valve block 3112 to isolate the air supply cavity 30 from the storage cavity 101.

When gas needs to be supplied into the cylinder, the gas inlet control valve 32 controls the gas inlet communicating valve 31 to be opened, specifically, hydraulic oil enters the oil cavity, the thrust of the hydraulic oil on the piston assembly 3121 and the valve rod 3122 is gradually increased along with the increase of the hydraulic oil, the valve core assembly 312 moves towards the direction extending into the storage cavity 101 along the axis direction of the valve core assembly, the elastic member 313 is compressed, the other end of the valve rod 3122 is separated from the gas inlet valve block 311, the gas in the gas supply cavity 30 enters the gas supply cavity 30 and finally flows into the cylinder from the gas outlet 102, and the purpose of supplying the gas in the gas supply cavity 30 to the cylinder is achieved; when the cylinder no longer needs gas, the air intake control valve 32 controls the air communicating valve to close, specifically, hydraulic oil in the oil cavity flows back, along with the reduction of hydraulic oil, when the thrust of the elastic part 313 to the valve core assembly 312 is greater than the thrust of hydraulic oil to the piston assembly 3121 and the valve rod 3122, the valve core assembly 312 moves along the direction of the self axis direction deviating from the storage cavity 101, the other end of the valve rod 3122 abuts against the air intake valve block 311, the air supply cavity 30 is isolated from the storage cavity 101, the response speed of the air intake communicating valve 31 is high, the gas in the air supply cavity 30 can not continue to enter the air supply cavity 30, and the purpose of stopping supplying gas to the cylinder is achieved.

As shown in fig. 2, the storage portion 1 of the present embodiment is provided with a purge port 103 and a communication passage 104 which communicate with each other, the communication passage 104 communicating with the storage chamber 101 and each air supply chamber 30, respectively, and the communication passage 104 is provided with the purge valve assembly 4. When the purge valve assembly 4 is opened, the purge port 103 is respectively communicated with the gas supply cavity 30 and the storage cavity 101 through the communication channel 104, and purge gas can be introduced into the communication channel 104 through the purge port 103 to purge the gas supply cavity 30 and the storage cavity 101, wherein the purge gas can be inert gas; when the purge valve assembly 4 is closed, the communication passage 104 is in a disconnected state in which neither the gas supply chamber 30 nor the storage chamber 101 communicates with the purge port 103.

Specifically, as shown in fig. 2, the communication passage 104 includes a first communication passage 1041 and a second communication passage 1042, the first communication passage 1041 communicates with the purge port 103 and each air supply chamber 30, respectively, one end of the second communication passage 1042 communicates with the first communication passage 1041, and the other end communicates with the storage chamber 101. As shown in fig. 2, the purge valve assembly 4 of the present embodiment includes a purge control valve 41 and a purge communication valve, and the purge control valve 41 is used to control the opening or closing of the purge communication valve to communicate or disconnect the gas supply chamber 30 or the storage chamber 101 with the purge port 103. Specifically, as shown in fig. 2, the number of the purge communication valves is two, the two purge communication valves are a first purge communication valve 421 and a second purge communication valve 422, the first purge communication valve 421 and the second purge communication valve 422 are sequentially distributed along the flow direction of the purge gas, the first purge communication valve 421 is disposed at the intersection of the first communication passage 1041 and the second communication passage 1042, and the second purge communication valve 422 is disposed on the first communication passage 1041.

Further, when the air supply cavity 30 and the storage cavity 101 need to be purged, the purge control valve 41 controls the first purge communicating valve 421 and the second purge communicating valve 422 to be opened, and opens the air intake valve assembly 2, at this time, the air supply cavity 30 is communicated with the purge port 103 through the first communicating passage 1041, the storage cavity 101 is communicated with the purge port 103 through the second communicating passage 1042 and the first communicating passage 1041, and at this time, the purge gas is blown in, the gas in the storage cavity 101 can be discharged outwards through the air intake valve assembly 2, and the gas in the air supply cavity 30 can be directly discharged from the air outlet 102. Before and after the integrated gas common rail structure starts to work, the four gas supply cavities 30 and the storage cavity 101 need to be cleaned safely, so that the safety of the integrated gas common rail structure is ensured.

Preferably, the integrated gas common rail structure of the embodiment further includes a controller (not shown in the figure), the controller is electrically connected to the gas inlet control valve 32 and the purge control valve 41, the controller may be a centralized or distributed controller, for example, the controller may be a single chip microcomputer, or may be formed by a plurality of distributed single chip microcomputers, and the single chip microcomputers may run control programs to control the gas inlet control valve 32 and the purge control valve 41 to implement their functions.

It should be noted that the air intake control valve 32 of the present embodiment is a valve capable of receiving a signal from the controller and controlling the connection or disconnection of the air intake communication valve 31, the purge control valve 41 is a valve capable of receiving a signal from the controller and controlling the connection or disconnection of the purge communication valve, and the air intake control valve 32, the purge control valve 41, and the purge communication valve are all commercially available and will not be described herein again.

When the integrated gas common rail structure of the embodiment is adopted to supply gas for the cylinder, the specific operation steps are as follows:

step one, the purge control valve 41 controls the first purge communicating valve 421 and the second purge communicating valve 422 to open, and simultaneously opens the air inlet valve assembly 2 to blow purge gas into the purge port 103, the purge gas purges the air supply cavity 30 and the storage cavity 101, the gas in the air supply cavity 30 is discharged from the air outlet 102, and the gas in the storage cavity 101 is discharged outwards through the air inlet valve assembly 2;

step two, after purging is finished, the purging control valve 41 controls the first purging communicating valve 421 and the second purging communicating valve 422 to be closed, and simultaneously closes the air inlet valve assembly 2;

step three, opening the air inlet valve assembly 2 again, and introducing fuel gas into the storage cavity 101;

step four, closing the air inlet valve assembly 2 after a period of time;

step five, the air inlet control valve 32 controls the air inlet communicating valve 31 to be opened, the valve core assembly 312 moves towards the direction extending into the storage cavity 101 along the axis direction of the valve core assembly, the elastic piece 313 is compressed, the other end of the valve rod 3122 is separated from the air inlet valve block 311, and the gas in the air supply cavity 30 enters the air supply cavity 30 and finally flows to the cylinder from the air outlet 102;

step six, after a period of time, the air inlet control valve 32 controls the air inlet communicating valve 31 to be closed, the elastic piece 313 resets the valve core assembly 312, and the air supply cavity 30 is isolated from the storage cavity 101;

step seven, the purge control valve 41 controls the first purge communicating valve 421 and the second purge communicating valve 422 to be opened, simultaneously opens the air inlet valve assembly 2, and blows purge gas into the purge port 103 again, the purge gas purges the air supply cavity 30 and the storage cavity 101, the gas in the air supply cavity 30 is discharged from the air outlet 102, and the gas in the storage cavity 101 is discharged outwards through the air inlet valve assembly 2;

step eight, after the purging is finished, the purge control valve 41 controls the first purge communication valve 421 and the second purge communication valve 422 to be closed, and simultaneously closes the intake valve assembly 2.

The embodiment also provides an engine, which comprises four cylinders and the integrated gas common rail structure, wherein each cylinder is communicated with one gas supply cavity 30.

The engine that this embodiment provided can provide the gas for four cylinders simultaneously, and this engine compares with current engine, has simple structure, small and the high advantage of security.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. An integrated gas common rail structure, comprising:

a storage portion (1), the storage portion (1) defining a storage chamber (101) therein;

the gas inlet valve assembly (2) is arranged at one end of the storage part (1), and when the gas inlet valve assembly (2) is opened, gas can be introduced into the storage cavity (101);

the storage part (1) is provided with at least two air supply valve assemblies (3), the air supply valve assemblies (3) are distributed along the length direction of the storage part (1), an air supply cavity (30) is defined in each air supply valve assembly (3), and when each air supply valve assembly (3) is opened, each air supply cavity (30) is communicated with the storage cavity (101) and the air cylinder;

and the purging valve assembly (4) is arranged at the other end of the storage part (1) and can purge the storage cavity (101) and the air supply cavity (30) when the purging valve assembly (4) is opened.

2. The integrated gas common rail structure according to claim 1, wherein at least two gas outlets (102) are provided on the storage portion (1), each gas outlet (102) is respectively communicated with one gas supply chamber (30), each gas supply valve assembly (3) comprises a gas inlet communicating valve (31), the gas outlet (102) is communicated with the storage chamber (101) through the gas supply chamber (30) when the gas inlet communicating valve (31) is opened, and the gas outlet (102) is isolated from the storage chamber (101) when the gas inlet communicating valve (31) is closed.

3. The integrated gas common rail structure according to claim 2, wherein each of the gas supply valve assemblies (3) further includes an intake control valve (32), the intake control valve (32) being for controlling opening and closing of the intake communication valve (31), the intake communication valve (31) including:

the air inlet valve block (311) is arranged on the storage part (1), and an installation cavity and the air supply cavity (30) are arranged on the air inlet valve block (311);

the hydraulic oil inlet control valve is characterized by comprising a valve core assembly (312), one end of the valve core assembly (312) is located in the installation cavity and forms an oil cavity with the air inlet valve block (311), the other end of the valve core assembly (312) is located on the outer side of the air inlet valve block (311) and can be abutted against the end of the air inlet valve block (311) to enable the air supply cavity (30) to be isolated from the storage cavity (101), when the air inlet control valve (32) controls the air inlet communicating valve (31) to be opened, the hydraulic oil entering the oil cavity can push the valve core assembly (312) to move towards the direction deviating from the oil cavity, and the storage cavity (101) is communicated with the air supply cavity (30);

the elastic component (313), elastic component (313) cover is established on case subassembly (312), the one end of elastic component (313) with case subassembly (312) link to each other, the other end with intake valve piece (311) link to each other, intake control valve (32) control when intake communicating valve (31) close, the hydraulic oil in the oil chamber flows out, elastic component (313) reset case subassembly (312), air supply chamber (30) with storage chamber (101) are isolated.

4. The integrated gas common rail structure according to claim 3, wherein the valve core assembly (312) comprises a piston assembly (3121) and a valve rod (3122), the piston assembly (3121) is fixedly arranged at one end of the valve rod (3122) and is in sealing sliding connection with the intake valve block (311), and the elastic member (313) is sleeved on the valve rod (3122).

5. The integrated gas common rail structure according to claim 1, wherein a communicating purge port (103) and a communicating passage (104) are provided on the storage portion (1), the communicating passage (104) communicates with the storage chamber (101) and each of the gas supply chambers (30), respectively, and the purge valve assembly (4) is provided on the communicating passage (104).

6. The integrated gas common rail structure according to claim 5, wherein the communication passage (104) includes a first communication passage (1041) and a second communication passage (1042), the first communication passage (1041) communicates with the purge port (103) and each of the gas supply chambers (30), respectively, one end of the second communication passage (1042) communicates with the first communication passage (1041), and the other end communicates with the storage chamber (101).

7. The integrated gas common rail structure according to claim 6, wherein the purge valve assembly (4) comprises a purge control valve (41) and a purge communication valve, and the purge control valve (41) is used for controlling the opening or closing of the purge communication valve so as to communicate or disconnect the gas supply chamber (30) or the storage chamber (101) with the purge port (103).

8. The integrated gas common rail structure according to claim 7, wherein the number of the purge communication valves is two, the two purge communication valves are respectively a first purge communication valve (421) and a second purge communication valve (422), the first purge communication valve (421) is disposed at the intersection of the first communication passage (1041) and the second communication passage (1042), and the second purge communication valve (422) is disposed on the first communication passage (1041).

9. The integrated gas common rail structure according to claim 8, wherein the first purge communication valve (421) and the second purge communication valve (422) are sequentially distributed in a flow direction of purge gas.

10. An engine, characterized by comprising at least two cylinders each communicating with one of said air supply chambers (30) and an integrated gas common rail structure according to any one of claims 1 to 9.

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