An integrated gas common rail structure and an engine

Abstract

The present invention relates to the technical field of gas supply for engines, and discloses an integrated gas common rail structure and an engine. The integrated gas common rail structure includes: a storage part, which defines a storage cavity therein; an intake valve assembly, arranged at one end of the storage part and capable of introducing gas into the storage cavity when it is opened; at least two gas supply valve assemblies, distributed along the length direction of the storage part and defining a gas supply cavity therein. When the gas supply valve assembly is opened, the gas supply cavity communicates with the storage cavity and the cylinder; a purge valve assembly, arranged at the other end of the storage part and capable of purging the storage cavity and the gas supply cavity when it is opened. The integrated gas common rail structure disclosed by the present invention integrates the storage part, the intake valve assembly, at least two gas supply valve assemblies and the purge valve assembly into one body, with a simple structure and a small volume. It can supply gas to at least two cylinders of the engine at the same time. The purge valve assembly can purge the residual gas in the storage cavity and the gas supply cavity, avoiding the explosion caused by the mixture of gas and air, and having relatively high safety.

Description

Technical Field

[0001] The present invention relates to the technical field of gas supply for engines, and particularly to an integrated gas common rail structure and an engine. Background Art

[0002] For existing gas engines, each engine includes at least two cylinders and at least two gas supply components. One gas supply component supplies gas to one cylinder, resulting in a complex and large-sized engine structure. Summary of the Invention

[0003] Based on the above, the purpose of the present invention is to provide an integrated gas common rail structure and an engine, which solve the problems of complex structure and large size of existing engines.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] An integrated gas common rail structure includes: a storage part, in which a storage cavity is defined; an intake valve assembly, arranged at one end of the storage part and capable of introducing gas into the storage cavity when the intake valve assembly is opened; at least two gas supply valve assemblies, distributed along the length direction of the storage part and in which a gas supply cavity is defined, and when the gas supply valve assembly is opened, the gas supply cavity communicates with the storage cavity and the cylinder; a purge valve assembly, arranged at the other end of the storage part and capable of purging the storage cavity and the gas supply cavity when the purge valve assembly is opened.

[0006] As a preferred solution of the integrated gas common rail structure, at least two gas outlets are provided on the storage part, each gas outlet is respectively communicated with one gas supply cavity, and each gas supply valve assembly includes an intake connection valve. When the intake connection valve is opened, the gas outlet communicates with the storage cavity through the gas supply cavity, and when the intake connection valve is closed, the gas outlet is isolated from the storage cavity.

[0007] As a preferred solution of an integrated gas common rail structure, each of the gas supply valve assemblies further includes an intake control valve for controlling the opening and closing of the intake connection valve. The intake connection valve includes: an intake valve block disposed on the storage portion, with an installation cavity and the gas supply cavity provided on the intake valve block; a valve core assembly, one end of the valve core assembly is located in the installation cavity and forms an oil cavity with the intake valve block, and the other end of the valve core assembly is located outside the intake valve block and can abut against the end of the intake valve block to isolate the gas supply cavity from the storage cavity. When the intake control valve controls the intake connection valve to open, the hydraulic oil entering the oil cavity can push the valve core assembly to move in a direction away from the oil cavity, and the storage cavity is communicated with the gas supply cavity; an elastic member sleeved on the valve core assembly, one end of the elastic member is connected to the valve core assembly, and the other end is connected to the intake valve block. When the intake control valve controls the intake connection valve to close, the hydraulic oil in the oil cavity flows out, and the elastic member resets the valve core assembly, isolating the gas supply cavity from the storage cavity.

[0008] As a preferred solution of an integrated gas common rail structure, the valve core assembly includes a piston assembly and a valve rod. The piston assembly is fixedly arranged at one end of the valve rod and is in sealed sliding connection with the intake valve block, and the elastic member is sleeved on the valve rod.

[0009] As a preferred solution of an integrated gas common rail structure, a purge port and a communication channel are provided on the storage portion. The communication channel is respectively communicated with the storage cavity and each gas supply cavity, and a purge valve assembly is provided on the communication channel.

[0010] As a preferred solution of an integrated gas common rail structure, the communication channel includes a first communication channel and a second communication channel. The first communication channel is respectively communicated with the purge port and each gas supply cavity, and one end of the second communication channel is communicated with the first communication channel, and the other end is communicated with the storage cavity.

[0011] As a preferred solution of an integrated gas common rail structure, the purge valve assembly includes a purge control valve and a purge connection valve. The purge control valve is used to control the opening or closing of the purge connection valve, so that the gas supply cavity or the storage cavity is communicated with or disconnected from the purge port.

[0012] As a preferred solution of an integrated gas common rail structure, the number of the purge connection valves is two. The two purge connection valves are respectively a first purge connection valve and a second purge connection valve. The first purge connection valve is arranged at the intersection of the first communication channel and the second communication channel, and the second purge connection valve is arranged on the first communication channel.

[0013] As a preferred embodiment of the integrated gas common rail structure, the first purge connection valve and the second purge connection valve are arranged in sequence along the flow direction of the purge gas.

[0014] An engine includes at least two cylinders and the integrated gas common rail structure according to any one of the above embodiments, and each of the cylinders is in communication with one of the gas supply chambers.

[0015] The beneficial effects of the present invention are as follows: The integrated gas common rail structure disclosed by the present invention integrates a storage part, an intake valve assembly, at least two gas supply valve assemblies and a purge valve assembly into one body, with a simple structure and a small volume. This integrated gas common rail structure can supply gas to at least two cylinders of the engine simultaneously, and the purge valve assembly can purge the residual gas in the storage chamber and the gas supply chamber, avoiding the explosion caused by the mixture of gas and air, and having high safety.

[0016] The engine disclosed by the present invention can supply gas to at least two cylinders simultaneously. Compared with the existing engines, this engine has the advantages of simple structure, small volume and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0018] Figure 1 is a schematic diagram of the integrated gas common rail structure provided by a specific embodiment of the present invention;

[0019] Figure 2 is a longitudinal sectional view of the integrated gas common rail structure provided by a specific embodiment of the present invention;

[0020] Figure 3 is a transverse sectional view of the integrated gas common rail structure provided by a specific embodiment of the present invention.

[0021] In the figure:

[0022] 1. Storage part; 101. Storage chamber; 102. Air outlet; 103. Purge port; 104. Communication channel; 1041. First communication channel; 1042. Second communication channel;

[0023] 2. Intake valve assembly;

[0024] 3. Gas supply valve assembly; 30. Gas supply chamber; 31. Intake connection valve; 311. Intake valve block; 3111. First intake valve block; 3112. Second intake valve block; 312. Spool assembly; 3121. Piston assembly; 3122. Valve stem; 313. Elastic member; 32. Intake control valve;

[0025] 4. Purge valve assembly; 41. Purge control valve; 421. First purge connection valve; 422. Second purge connection valve. Detailed implementation manners

[0026] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] Such as Figures 1 to 3As shown in the figure, this embodiment provides an integrated gas common rail structure, which includes a storage part 1, an intake valve assembly 2, four gas supply valve assemblies 3 and a purge valve assembly 4. A storage cavity 101 is defined in the storage part 1. The intake valve assembly 2 is arranged at one end of the storage part 1, and when the intake valve assembly 2 is opened, gas can be introduced into the storage cavity 101. The four gas supply valve assemblies 3 are distributed along the length direction of the storage part 1, and a gas supply cavity 30 is defined in the gas supply valve assembly 3. When the gas supply valve assembly 3 is opened, the gas supply cavity 30 communicates with the storage cavity 101 and the cylinder. The purge valve assembly 4 is arranged at the other end of the storage part 1, and when the purge valve assembly 4 is opened, it can purge the residual gas in the storage cavity 101 and the gas supply cavity 30.

[0030] It should be noted that the intake valve assembly 2 can be a manually operated or electrically controlled intake valve. Both of these two types of valves belong to the prior art and can be obtained through external purchase specifically, so details will not be elaborated here. In other embodiments, the number of the gas supply valve assemblies 3 is not limited to four in this embodiment, and can also be two, three or more than four, which is specifically set according to the number of cylinders of the engine.

[0031] The integrated gas common rail structure provided by this embodiment integrates the storage part 1, the intake valve assembly 2, the four gas supply valve assemblies 3 and the purge valve assembly 4. It has a simple structure and a small volume. This integrated gas common rail structure can supply gas to the four cylinders of the engine at the same time. The purge valve assembly 4 can purge the residual gas in the storage cavity 101 and the gas supply cavity 30, avoiding the explosion caused by the mixture of gas and air, and has high safety.

[0032] Specifically, as Figure 1 shown, the storage part 1 of this embodiment is provided with four air outlets 102, and each air outlet 102 is respectively communicated with a gas supply cavity 30. Each gas supply valve assembly 3 includes an intake connection valve 31. When the intake connection valve 31 is opened, the air outlet 102 is communicated with the storage cavity 101 through the gas supply cavity 30. When the intake connection valve 31 is closed, the air outlet 102 is isolated from the storage cavity 101.

[0033] Specifically, the intake connection valve 31 of this embodiment is a mechanical connection valve. As Figure 3 shown, each gas supply valve assembly 3 further includes an intake control valve 32 and a hydraulic pipeline assembly (not shown in the figure). The intake control valve 32 is used to control the opening and closing of the intake connection valve 31 by controlling the flow direction of the hydraulic oil in the hydraulic pipeline assembly. As Figure 3As shown, the intake connection 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 arranged on the storage part 1. An installation cavity (not shown in the figure) and a gas supply cavity 30 are provided on the intake valve block 311. One end of the valve core assembly 312 is located in the installation 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 the end of the intake valve block 311 to isolate the gas supply cavity 30 from the storage cavity 101. When the intake control valve 32 controls the opening of the intake connection valve 31, the 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 in a direction away from the oil cavity, and the storage cavity 101 is communicated with the gas 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, and the other end is connected to the intake valve block 311. When the intake control valve 32 controls the closing of the intake connection valve 31, the hydraulic oil in the oil cavity flows back into the hydraulic pipeline assembly, and the elastic member 313 resets the valve core assembly 312, isolating the gas supply cavity 30 from the storage cavity 101.

[0034] Further, as Figure 2 shown, the intake valve block 311 includes a fixedly arranged first intake valve block 3111 and a second intake valve block 3112. The installation cavity includes a communicated first installation cavity and a second installation cavity. The first installation cavity is located in the first intake valve block 3111, and the second installation cavity is located in the second intake valve block 3112. As Figure 3 shown, the valve core assembly 312 includes a piston assembly 3121 and a valve stem 3122. The piston assembly 3121 is located in the first installation cavity and is in sealed sliding connection with the first intake valve block 3111. One end of the valve stem 3122 penetrates through the second installation cavity and is fixedly connected to the piston assembly 3121. The elastic member 313 is sleeved on the valve stem 3122 and is located in the second installation cavity. The other end of the valve stem 3122 is located outside the second intake valve block 3112 and can abut against the end of the second intake valve block 3112 to isolate the gas supply cavity 30 from the storage cavity 101.

[0035] When it is necessary to supply gas into the cylinder, the intake control valve 32 controls the intake connection valve 31 to open. Specifically, hydraulic oil enters the oil chamber. As the hydraulic oil increases, the thrust of the hydraulic oil on the piston assembly 3121 and the valve stem 3122 gradually increases. The valve core assembly 312 moves along its own axis direction towards the direction of extending into the storage chamber 101. The elastic member 313 is compressed, and the other end of the valve stem 3122 disengages from the intake valve block 311. The gas in the gas supply chamber 30 enters the gas supply chamber 30 and finally flows into the cylinder from the air outlet 102, achieving the purpose of supplying gas in the gas supply chamber 30 to the cylinder. When the cylinder no longer needs gas, the intake control valve 32 controls the gas connection valve to close. Specifically, the hydraulic oil in the oil chamber flows back. As the hydraulic oil decreases, when the thrust of the elastic member 313 on the valve core assembly 312 is greater than the thrust of the hydraulic oil on the piston assembly 3121 and the valve stem 3122, the valve core assembly 312 moves along its own axis direction towards the direction away from the storage chamber 101. The other end of the valve stem 3122 abuts against the intake valve block 311, isolating the gas supply chamber 30 from the storage chamber 101. The response speed of the intake connection valve 31 is relatively fast, and the gas in the gas supply chamber 30 cannot continue to enter the gas supply chamber 30, achieving the purpose of stopping the gas supply to the cylinder.

[0036] As Figure 2 shown, the storage part 1 of this embodiment is provided with a connected purge port 103 and a connection channel 104. The connection channel 104 is respectively connected to the storage chamber 101 and each gas supply chamber 30. A purge valve assembly 4 is provided on the connection channel 104. When the purge valve assembly 4 is opened, the purge port 103 is respectively connected to the gas supply chamber 30 and the storage chamber 101 through the connection channel 104. By introducing purge gas into the connection channel 104 through the purge port 103, the gas supply chamber 30 and the storage chamber 101 can be purged. The purge gas can be an inert gas. When the purge valve assembly 4 is closed, the connection channel 104 is in a disconnected state. At this time, neither the gas supply chamber 30 nor the storage chamber 101 is connected to the purge port 103.

[0037] Specifically, as Figure 2 shown, the connection channel 104 includes a first connection channel 1041 and a second connection channel 1042. The first connection channel 1041 is respectively connected to the purge port 103 and each gas supply chamber 30. One end of the second connection channel 1042 is connected to the first connection channel 1041, and the other end is connected to the storage chamber 101. As Figure 2 shown, the purge valve assembly 4 of this embodiment includes a purge control valve 41 and a purge connection valve. The purge control valve 41 is used to control the opening or closing of the purge connection valve, so that the gas supply chamber 30 or the storage chamber 101 is connected or disconnected from the purge port 103. Specifically, as Figure 2As shown, the number of purge connection valves is two. The two purge connection valves are the first purge connection valve 421 and the second purge connection valve 422 respectively. The first purge connection valve 421 and the second purge connection valve 422 are arranged in sequence along the flow direction of the purge gas. The first purge connection valve 421 is arranged at the intersection of the first connection channel 1041 and the second connection channel 1042, and the second purge connection valve 422 is arranged on the first connection channel 1041.

[0038] Further, when purging the gas supply chamber 30 and the storage chamber 101 is required, the purge control valve 41 controls the opening of the first purge connection valve 421 and the second purge connection valve 422, and the intake valve assembly 2 is opened. At this time, the gas supply chamber 30 is connected to the purge port 103 through the first connection channel 1041, and the storage chamber 101 is connected to the purge port 103 through the second connection channel 1042 and the first connection channel 1041. At this time, purge gas is blown in, and the gas in the storage chamber 101 can be discharged outward through the intake valve assembly 2, and the gas in the gas supply chamber 30 can be directly discharged from the air outlet 102. Before the integrated fuel rail structure starts working and after it stops working, it is necessary to perform safety cleaning work on the four gas supply chambers 30 and one storage chamber 101 to ensure the safety of the integrated fuel rail structure.

[0039] Preferably, the integrated fuel rail structure of this embodiment further includes a controller (not shown in the figure). The controller is electrically connected to the intake control valve 32 and the purge control valve 41 respectively. The controller can be a centralized or distributed controller. For example, the controller can be a single microcontroller or composed of multiple distributed microcontrollers. A control program can run in the microcontroller to control the intake control valve 32 and the purge control valve 41 to realize their functions.

[0040] It should be noted that the intake control valve 32 of this embodiment is a valve that can receive the signal of the controller and control the intake connection valve 31 to be connected or disconnected. The purge control valve 41 is a valve that can receive the signal of the controller and control the purge connection valve to be connected or disconnected. The intake control valve 32, the purge control valve 41 and the purge connection valve can all be obtained through external purchase, and will not be elaborated here.

[0041] When using the integrated fuel rail structure of this embodiment to supply fuel to the cylinder, the specific operation steps are as follows:

[0042] Step 1, the purge control valve 41 controls the opening of the first purge connection valve 421 and the second purge connection valve 422, and at the same time opens the intake valve assembly 2 to blow purge gas into the purge port 103. The purge gas purges the gas supply chamber 30 and the storage chamber 101. The gas in the gas supply chamber 30 is discharged from the air outlet 102, and the gas in the storage chamber 101 is discharged outward through the intake valve assembly 2;

[0043] Step 2: After the purging is completed, the purging control valve 41 controls the closing of the first purging connection valve 421 and the second purging connection valve 422, and at the same time, the intake valve assembly 2 is closed.

[0044] Step 3: The intake valve assembly 2 is opened again to introduce fuel gas into the storage chamber 101.

[0045] Step 4: After a period of time, the intake valve assembly 2 is closed.

[0046] Step 5: The intake control valve 32 controls the opening of the intake connection valve 31. The valve core assembly 312 moves in the direction of extending into the storage chamber 101 along its own axis. The elastic member 313 is compressed, and the other end of the valve stem 3122 disengages from the intake valve block 311. The fuel gas in the gas supply chamber 30 enters the gas supply chamber 30 and finally flows out from the air outlet 102 to the cylinder.

[0047] Step 6: After a period of time, the intake control valve 32 controls the closing of the intake connection valve 31. The elastic member 313 resets the valve core assembly 312, isolating the gas supply chamber 30 from the storage chamber 101.

[0048] Step 7: The purging control valve 41 controls the opening of the first purging connection valve 421 and the second purging connection valve 422. At the same time, the intake valve assembly 2 is opened to blow purging gas into the purging port 103 again. The purging gas purges the gas supply chamber 30 and the storage chamber 101. The gas in the gas supply chamber 30 is discharged from the air outlet 102, and the gas in the storage chamber 101 is discharged outward through the intake valve assembly 2.

[0049] Step 8: After the purging is completed, the purging control valve 41 controls the closing of the first purging connection valve 421 and the second purging connection valve 422, and at the same time, the intake valve assembly 2 is closed.

[0050] This embodiment also provides an engine, which includes four cylinders and the integrated fuel gas common rail structure described in this embodiment. Each cylinder is connected to a gas supply chamber 30.

[0051] The engine provided in this embodiment can supply fuel gas to four cylinders simultaneously. Compared with the existing engines, this engine has the advantages of simple structure, small volume and high safety.

[0052] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An integrated gas common rail structure, characterized in that, Comprising: A storage part (1), a storage cavity (101) being defined inside the storage part (1); An intake valve assembly (2), arranged at one end of the storage part (1) and capable of introducing fuel gas into the storage cavity (101) when the intake valve assembly (2) is opened; At least two gas supply valve assemblies (3), distributed along the length direction of the storage part (1) and a gas supply cavity (30) being defined inside the gas supply valve assembly (3), the gas supply cavity (30) communicating with the storage cavity (101) and a cylinder when the gas supply valve assembly (3) is opened; A purging valve assembly (4), arranged at the other end of the storage part (1) and capable of purging the storage cavity (101) and the gas supply cavity (30) when the purging valve assembly (4) is opened; At least two gas outlet ports (102) are provided on the storage part (1), each gas outlet port (102) communicating with one gas supply cavity (30) respectively, each gas supply valve assembly (3) includes an intake connection valve (31), when the intake connection valve (31) is opened, the gas outlet port (102) communicates with the storage cavity (101) through the gas supply cavity (30), and when the intake connection valve (31) is closed, the gas outlet port (102) is isolated from the storage cavity (101); A purging port (103) and a connection channel (104) which are connected are provided on the storage part (1), the connection channel (104) communicates with the storage cavity (101) and each gas supply cavity (30) respectively, and the purging valve assembly (4) is provided on the connection channel (104); The connection channel (104) includes a first connection channel (1041) and a second connection channel (1042), the first connection channel (1041) communicates with the purging port (103) and each gas supply cavity (30) respectively, one end of the second connection channel (1042) is connected to the first connection channel (1041), and the other end is connected to the storage cavity (101); The purging valve assembly (4) includes a purging control valve (41) and a purging connection valve, the purging control valve (41) is used to control the opening or closing of the purging connection valve, so that the gas supply cavity (30) or the storage cavity (101) communicates with or disconnects from the purging port (103); The number of the purging connection valves is two, the two purging connection valves are a first purging connection valve (421) and a second purging connection valve (422) respectively, the first purging connection valve (421) is arranged at the intersection of the first connection channel (1041) and the second connection channel (1042), and the second purging connection valve (422) is arranged on the first connection channel (1041); 2. The integrated gas common rail structure according to claim 1, characterized in that, Each gas supply valve assembly (3) further includes an intake control valve (32), the intake control valve (32) is used to control the opening and closing of the intake connection valve (31), and the intake connection valve (31) includes: An intake valve block (311), arranged on the storage part (1), an installation cavity and the gas supply cavity (30) being provided on the intake valve block (311); A spool valve assembly (312), one end of the spool valve assembly (312) is located in the installation cavity and forms an oil chamber with the intake valve block (311), the other end of the spool valve assembly (312) is located outside the intake valve block (311) and can abut against the end of the intake valve block (311) to isolate the air supply chamber (30) from the storage chamber (101). When the intake control valve (32) controls the opening of the intake connection valve (31), the hydraulic oil entering the oil chamber can push the spool valve assembly (312) to move in a direction away from the oil chamber, and the storage chamber (101) is communicated with the air supply chamber (30); An elastic member (313), the elastic member (313) is sleeved on the spool valve assembly (312), one end of the elastic member (313) is connected to the spool valve assembly (312), and the other end is connected to the intake valve block (311). When the intake control valve (32) controls the closing of the intake connection valve (31), the hydraulic oil in the oil chamber flows out, and the elastic member (313) resets the spool valve assembly (312), and the air supply chamber (30) is isolated from the storage chamber (101).

3. The integrated gas common rail structure according to claim 2, characterized in that, The spool valve assembly (312) includes a piston assembly (3121) and a valve stem (3122), the piston assembly (3121) is fixedly arranged at one end of the valve stem (3122) and is in sealed sliding connection with the intake valve block (311), and the elastic member (313) is sleeved on the valve stem (3122).

4. The integrated gas common rail structure according to claim 1, characterized in that, The first purge connection valve (421) and the second purge connection valve (422) are distributed in sequence along the flow direction of the purge gas.

5. An engine, characterized in that, It includes at least two cylinders and the integrated gas common rail structure according to any one of claims 1 to 4, and each cylinder is communicated with one air supply chamber (30).

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