CN212106043U - Dual-fuel engine - Google Patents

Abstract

The utility model discloses a dual-fuel engine relates to marine power technology equipment field. The dual-fuel engine comprises a rack, a gas system, a fuel system, a lubricating system and a starting air system, wherein the gas system comprises a plurality of gas branch pipes and gas injection devices, each gas branch pipe is connected with one gas injection device, and two adjacent gas branch pipes are detachably connected through a double-wall corrugated pipe; the fuel system comprises a fuel oil return pipeline, the lubricating system comprises a cylinder cover lubricating oil pipeline, and the starting air system comprises a starting air pipeline; the dual-fuel engine further comprises a multi-fluid connector, the multi-fluid connector is mounted on the rack, a first channel, a second channel and a third channel which are mutually independent are arranged in the multi-fluid connector, and the fuel oil return pipeline, the cylinder cover lubricating oil pipeline and the starting air pipeline are respectively communicated with the first channel, the second channel and the third channel. The dual-fuel engine is convenient to maintain and install, and integrates and simplifies multiple pipelines.

Description

Dual-fuel engine

Technical Field

The utility model relates to a marine power technology equipment field, concretely relates to dual-fuel engine.

Background

With the strictness of emission regulations and the increasingly shortage of world energy, high efficiency, energy conservation and environmental protection become the leading direction of the technical development of internal combustion engines, liquefied natural gas ((LNG) has the characteristics of high energy density, low emission, convenience in transportation and the like, and is considered as an engine clean fuel with the greatest development prospect.

The original diesel engine comprises fixed components (a cylinder cover, a cylinder sleeve, a machine body, a machine base and the like), moving components (a piston, a piston pin, a connecting rod, a camshaft, a rocker arm and the like), a fuel system (a fuel tank, a fuel pipeline, a fuel oil return pipeline, a fuel delivery pump, a fuel injector and the like), a starting air system (an air compressor, a distributor, an air pipeline, an air valve and the like), an air inlet and exhaust system (an air inlet and exhaust pipeline, an air inlet and exhaust valve and the like), a lubricating system (a lubricating pipeline, a fuel pump, a fuel injection nozzle and the like) and the like, wherein when the starting air system is used for starting, compressed air is injected into the cylinder sleeve firstly, the compressed air pushes the piston to move so as to realize the starting process of the whole engine, after the starting air system is started, the air, the fuel system sprays atomized diesel oil into the cylinder sleeve and mixes with air to burn so as to push the piston to continuously do work, and meanwhile, the lubricating system continuously lubricates all moving parts, so that mechanical loss is reduced. In order to improve the efficiency of the engine, the engine which is formed by four cylinders, eight cylinders or twelve cylinders in an L shape, single row and straight line or V shape and double row is generally adopted to continuously and alternately provide power.

The existing V-shaped double-row dual-fuel engine is generally added with a fuel gas supply system on the basis of the original diesel engine, the fuel gas supply system comprises a main fuel gas pipeline, a plurality of fuel gas branch pipes and a fuel gas injection device, each fuel gas branch pipe is communicated with one fuel gas injection device to inject fuel gas into a cylinder sleeve, and as the original diesel engine is provided with a plurality of pipe systems such as fuel oil, lubricating oil, starting air, air inlet and exhaust pipes and the like, and the pipe system on the fuel gas supply system is added, the pipe system structure of the dual-fuel engine is more complicated and messy, and the added fuel gas supply system is not convenient to maintain and install.

Accordingly, there is a need for a dual fuel engine that solves the above mentioned problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a dual-fuel engine, be convenient for maintain the installation, and carry out the integration to the multitube way and simplify, improved the holistic aesthetic property of dual-fuel engine and reduced the interference between the multitube way.

To achieve the purpose, the utility model adopts the following technical proposal:

a dual-fuel engine comprises a rack, a gas system, a fuel system, a lubricating system and a starting air system, wherein the gas system comprises a plurality of gas branch pipes and a gas injection device, each gas branch pipe is connected with one gas injection device, two adjacent gas branch pipes are detachably connected through a double-wall corrugated pipe, and the gas injection device is used for injecting gas into a cylinder sleeve;

the fuel system comprises a fuel oil return pipeline, the lubricating system comprises a cylinder cover lubricating oil pipeline, and the starting air system comprises a starting air pipeline; the dual-fuel engine further comprises a multi-fluid connector, the multi-fluid connector is mounted on the frame, a first channel, a second channel and a third channel which are mutually independent are arranged in the multi-fluid connector, and the fuel oil return pipeline, the cylinder cover lubricating oil pipeline and the starting air pipeline are respectively communicated with the first channel, the second channel and the third channel.

Optionally, the gas branch pipe is a tee pipe having three connection ports, each connection port is provided with a connection flange, and each connection flange is connected to the double-wall corrugated pipe or the gas injection device.

Optionally, the dual-fuel engine further includes a cylinder cover and an intake manifold, the cylinder cover is disposed on the cylinder sleeve, the cylinder cover is provided with a fuel gas injection channel communicated with the cylinder sleeve, the intake manifold is communicated with the fuel gas injection channel, and the fuel gas injection device is installed in the intake manifold and communicated with the fuel gas injection channel.

Optionally, the fuel system further comprises a fuel injector, the fuel injector is arranged on the cylinder cover and communicated with the cylinder sleeve, the first channel is provided with a first inlet and a first outlet, the first inlet is communicated with the fuel injector, and the first outlet is communicated with the fuel return pipeline.

Optionally, a lubricating oil cooling channel is further arranged on the cylinder cover, the second channel is provided with a second inlet and a second outlet, the second inlet is communicated with the cylinder cover lubricating oil pipeline, and the second outlet is communicated with the lubricating oil cooling channel.

Optionally, a starting air inlet channel is further arranged on the cylinder cover, a third inlet and a third outlet are arranged on the third channel, the third inlet is communicated with the starting air pipeline, and the third outlet is communicated with the starting air inlet channel.

Optionally, the dual-fuel engine further includes a plurality of spigots, the first channel is further provided with a first manifold, the multiple fluid joints are provided with a plurality of first channels, and the first manifold of one of the first channels is communicated with the first outlet of the other first channel through the spigots in two adjacent first channels in the multiple fluid joints.

Optionally, a second junction port is further disposed on the third channel, and in two of the third channels in two adjacent multi-fluid joints, the second junction port of one of the third channels is communicated with the third inlet of the other third channel through the cannula.

Optionally, the first passage, the insertion tube, the fuel oil return pipeline, the second passage, the cylinder head lubricating oil pipeline, the third passage, the insertion tube and the starting air pipeline are detachably connected.

Optionally, the dual-fuel engine further comprises a ejector rod sleeve and a cam box, the multi-fluid connector is further provided with an ejector rod sleeve insertion hole, one end of the ejector rod sleeve penetrates through the ejector rod sleeve insertion hole to be connected with the cylinder cover, and the other end of the ejector rod sleeve is communicated with the cam box.

The utility model has the advantages that:

the utility model provides a pair of dual fuel engine, through setting up the gas system, the gas system includes a plurality of gas branch pipes and gas injection apparatus, and each gas branch pipe respectively connects a gas injection apparatus and provides the gas for the gas injection apparatus, and the gas injection apparatus is used for spraying the gas in the cylinder liner in order to realize the acting, and can dismantle the connection through the double-walled bellows between two adjacent gas branch pipes to the dismouting, maintenance and the transportation of gas branch pipe of being convenient for; through setting up the multifluid joint and with the multifluid joint installation in the frame, be equipped with mutually independent first passageway, second passageway and third passageway in the multifluid joint, fuel oil return line, cylinder cap lubricating oil pipeline, start air pipeline communicate with first passageway, second passageway and third passageway respectively to integrate, simplify the multitube way through the multifluid joint, reduced the interference between the multitube way and improved the holistic aesthetic property of dual fuel engine.

Drawings

Fig. 1 is a schematic diagram of an overall structure of a dual-fuel engine provided by an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structural diagram of a dual-fuel engine provided by an embodiment of the present invention;

fig. 3 is a first schematic structural diagram of a multi-fluid joint in a dual-fuel engine according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram ii of a multi-fluid joint in a dual-fuel engine according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram three of a multi-fluid joint in a dual-fuel engine provided by an embodiment of the present invention;

fig. 6 is a schematic diagram of an assembly structure of a multi-fluid joint, a frame, a cylinder head, and a cylinder liner in a dual-fuel engine according to an embodiment of the present invention.

In the figure:

1. a frame; 2. a gas system; 21. a gas branch pipe; 211. a connecting flange; 22. a gas injection device; 23. a double-walled bellows; 3. a cylinder liner; 4. a cylinder cover; 41. a gas injection channel; 5. an intake manifold; 6. a fuel return line; 7. starting an air pipeline; 8. a multi-fluid joint; 81. a first channel; 811. a first inlet; 812. a first outlet; 813. a first manifold port; 82. a second channel; 821. a second inlet; 822. a second outlet; 83. a third channel; 831. a third inlet; 832. a third outlet; 833. a second manifold port; 84. a jack of the ejector rod sleeve; 85. mounting holes; 9. inserting a tube; 10. a jack rod sleeve; 11. a cam box.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting 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", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific 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.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1-6, the dual-fuel engine disclosed in this embodiment includes a frame 1, a gas system 2, a fuel system, a lubrication system, a start air system, and a multi-fluid joint 8, where the gas system 2, the fuel system, the lubrication system, the start air system, and the multi-fluid joint 8 are all mounted on the frame 1. The gas system 2 comprises a plurality of gas branch pipes 21 and gas injection devices 22, each gas branch pipe 21 is connected with one gas injection device 22 respectively to continuously provide gas for the gas injection device 22, the gas injection devices 22 are used for injecting gas into the cylinder sleeve 3 to realize work of the dual-fuel engine, and two adjacent gas branch pipes 21 are detachably connected through a double-wall corrugated pipe 23 so as to facilitate the disassembly, assembly, maintenance and transportation of the plurality of gas branch pipes 21. The fuel system comprises a fuel return line 6 for returning spilled fuel via the fuel return line 6 to the fuel tank or the fuel filter. The lubricating system comprises a cylinder cover lubricating oil pipeline to realize the lubricating and cooling of the cylinder cover 4. The starting air system comprises a starting air line 7 to inject compressed air into the cylinder liners 3 for starting the dual fuel engine. The first channel 81, the second channel 82 and the third channel 83 which are mutually independent are arranged in the multi-fluid connector 8, and the fuel oil return pipeline 6, the cylinder cover lubricating oil pipeline and the starting air pipeline 7 are respectively communicated with the first channel 81, the second channel 82 and the third channel 83, so that the multiple pipelines are integrated and simplified through the multi-fluid connector 8, the interference among the multiple pipelines is reduced, and the integral attractiveness of the dual-fuel engine is improved.

As shown in fig. 1 and 2, the frame 1 is used for supporting the whole dual-fuel engine and is convenient to hoist so as to install the dual-fuel engine to a required position, the frame 1 is formed by integral casting, a cylinder sleeve mounting hole is formed in the frame 1, and the cylinder sleeve 3 is installed in the cylinder sleeve mounting hole.

Alternatively, as shown in fig. 1, the gas branch pipe 21 is a tee pipe having three connection ports, each of which is provided with a connection flange 211, and each of the connection flanges 211 is connected to the double-walled bellows 23 or the gas injection device 22. Correspondingly, the double-wall corrugated pipe 23 and the gas injection device 22 are respectively provided with a connecting flange interface, the connecting flange interfaces are matched with the connecting flange 211 for installation, the detachable connection of the gas branch pipe 21, the double-wall corrugated pipe 23 and the gas injection device 22 is realized, and the gas branch pipe 21 can be conveniently disassembled, maintained and replaced.

As shown in fig. 2, the dual-fuel engine further includes a cylinder cover 4, the cylinder cover 4 is covered on the cylinder sleeve 3 to form a combustion chamber of the dual-fuel engine, the cylinder cover 4 is provided with a fuel gas injection passage 41 and a starting air inlet passage which are communicated with the cylinder sleeve 3, and the cylinder cover 4 is further provided with a lubricating oil cooling passage to lubricate and cool the cylinder cover 4.

The dual-fuel engine further comprises an air inlet manifold 5, the air inlet manifold 5 is communicated with the fuel gas injection channel 41, and the fuel gas injection device 22 is installed in the air inlet manifold 5 and communicated with the fuel gas injection channel 41, so that the fuel gas and the air are mixed in the fuel gas injection channel 41, and the mixing uniformity is improved.

Optionally, as shown in fig. 2 to 4, the fuel system further includes a fuel injector, the fuel injector is disposed on the cylinder head 4 and is communicated with the cylinder sleeve 3 to inject atomized fuel into the cylinder sleeve 3, the first channel 81 is provided with a first inlet 811 and a first outlet 812, the first inlet 811 is communicated with the fuel injector, the first outlet 812 is communicated with the fuel return line 6, so that fuel overflowed from the fuel injector flows into the multi-fluid connector 8 through the first inlet 811, flows into the fuel return line 6 through the first outlet 812, and flows back into the fuel tank or the fuel filter through the fuel return line 6.

Alternatively, as shown in fig. 4, the second passage 82 is provided with a second inlet 821 and a second outlet 822, the second inlet 821 is communicated with the cylinder head lubricating oil pipeline, and the second outlet 822 is communicated with the lubricating oil cooling passage, so that the lubricating oil in the cylinder head lubricating oil pipeline flows into the second passage 82 through the second inlet 821 and flows into the lubricating oil cooling passage through the second outlet 822 to lubricate and cool the cylinder head 4.

Alternatively, as shown in fig. 3 and 4, the third passage 83 is provided with a third inlet 831 and a third outlet 832, the third inlet 831 communicating with the start air line 7, and the third outlet 832 communicating with the start air intake passage. Therefore, the compressed air in the starting air pipeline 7 flows into the third channel 83 through the third inlet 831 and flows to the starting air inlet channel through the third outlet 832, the starting air inlet channel is communicated with the cylinder sleeve 3, and the compressed air is injected into the cylinder sleeve 3 by controlling the opening and closing of the starting air valve so as to complete the starting of the dual-fuel engine.

Because the dual-fuel engine in the embodiment is in 12-cylinder double-row V-shaped arrangement, a plurality of multi-fluid connectors 8 are arranged, each cylinder sleeve 3 is respectively provided with one multi-fluid connector 8, the dual-fuel engine further comprises a plurality of insertion pipes 9, two adjacent multi-fluid connectors 8 are communicated through the insertion pipes 9 to reduce pipeline laying, and pipeline integration is further simplified.

Illustratively, as shown in fig. 3-6, the first passages 81 are further provided with first confluence ports 813, and of two first passages 81 in two adjacent multifluid joints 8, the first confluence port 813 of one first passage 81 is communicated with the first outlet 812 of the other first passage 81 through the insertion tube 9, so that the fuel in the plurality of first passages 81 is gathered into the same fuel return line 6 through the insertion tube 9, thereby achieving the purpose of reducing the arrangement of the fuel return line 6. It will be appreciated that the first outlet 812 of the first passageway 81 in the head end multifluid joint 8 communicates with the fuel return line 6, the first outlet 812 of the first passageway 81 in the tail end multifluid joint 8 communicates with the first manifold 813 of the first passageway 81 in the higher multifluid joint 8, and the first passageway 81 in the tail end multifluid joint 8 is not provided with the first manifold 813.

Illustratively, as shown in fig. 3-6, the third channels 83 are further provided with a second junction 833, and in two of the third channels 83 in two adjacent multi-fluid connectors 8, the second junction 833 of one of the third channels 83 is communicated with the third inlet 831 of the other third channel 83 through the cannula 9. To distribute the compressed air in the starting air line 7 through the cannula 9 into the third channels 83, so that a reduced setting of the starting air line 7 is achieved. It will be appreciated that, similarly to the arrangement of the first passage 81, the third inlet 831 of the third passage 83 in the first multi-fluid connection 8 communicates with the start-up air line 7, whereas the third passage 83 in the last multi-fluid connection 8 is not provided with the second confluence 833.

Optionally, the first channel 81 and the insertion tube 9 and the fuel return line 6, the second channel 82 and the cylinder head 4, and the third channel 83 and the insertion tube 9 and the starting air line 7 are detachably connected, so as to facilitate the disassembly, assembly, transportation and maintenance of the multi-fluid connector 8.

Optionally, as shown in fig. 2 and fig. 6, the dual-fuel engine further includes a ejector sleeve 10 and a cam box 11, a ejector sleeve jack 84 is disposed on the multi-fluid connector 8, one end of the ejector sleeve 10 penetrates through the ejector sleeve jack 84 to be connected with the cylinder head 4, and the other end of the ejector sleeve 10 is communicated with the cam box 11, so that lubricating oil leaked from the cylinder head 4 flows back to the cam box 11 through the ejector sleeve 10, and the ejector sleeve jack 84 has a limiting effect on the ejector sleeve 10, thereby ensuring a movement track in a vertical direction thereof.

In order to detachably mount the multi-fluid joint 8 on the frame 1, a plurality of mounting holes 85 are formed in the multi-fluid joint 8, a plurality of insertion holes corresponding to the positions of the mounting holes 85 are formed in the frame 1, and during mounting, a pin shaft or a bolt penetrates through the mounting holes 85 and abuts against the insertion holes to detachably mount and fix the multi-fluid joint 8 and the frame 1.

It should be noted that the dual-fuel engine has many and complicated structures, and other structures which are not described in detail or written in the embodiment are the prior art, and thus are not described herein again.

The utility model provides a dual-fuel engine, two adjacent gas branch pipes 21 can be detachably connected through the double-wall corrugated pipe 23, which is convenient for the disassembly, assembly, maintenance and transportation of each gas branch pipe 21; by arranging the multi-fluid connector 8 and installing the multi-fluid connector 8 on the frame 1, a first channel 81, a second channel 82 and a third channel 83 which are mutually independent are arranged in the multi-fluid connector 8, and the fuel oil return pipeline 6, the cylinder cover lubricating oil pipeline and the starting air pipeline 7 are respectively communicated with the first channel 81, the second channel 82 and the third channel 83, so that the multi-channels are integrated and simplified through the multi-fluid connector 8, the integral attractiveness of the dual-fuel engine is improved, and the interference among the multi-channels is reduced; and the first channel 81 and the third channel 83 between two adjacent multi-fluid connectors 8 are connected through the insertion pipe 9, so that the arrangement of the fuel oil return pipeline 6 and the starting air pipeline 7 is reduced, the pipelines are further integrated and optimized, and the integral attractiveness of the dual-fuel engine is improved.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims (10)

1. A dual-fuel engine comprises a rack (1), a gas system (2), a fuel system, a lubricating system and a starting air system, and is characterized in that the gas system (2) comprises a plurality of gas branch pipes (21) and gas injection devices (22), each gas branch pipe (21) is connected with one gas injection device (22), two adjacent gas branch pipes (21) are detachably connected through double-wall corrugated pipes (23), and the gas injection devices (22) are used for injecting gas into a cylinder sleeve (3);

the fuel system comprises a fuel return pipeline (6), the lubricating system comprises a cylinder cover lubricating oil pipeline, and the starting air system comprises a starting air pipeline (7); the dual-fuel engine further comprises a multi-fluid connector (8), the multi-fluid connector (8) is installed on the rack (1), a first channel (81), a second channel (82) and a third channel (83) which are independent of each other are arranged in the multi-fluid connector (8), and the fuel oil return pipeline (6), the cylinder cover lubricating oil pipeline and the starting air pipeline (7) are communicated with the first channel (81), the second channel (82) and the third channel (83) respectively.

2. The dual fuel engine as claimed in claim 1, characterized in that the gas branch pipe (21) is a tee with three connection ports, each connection port being provided with a connection flange (211), each connection flange (211) being connected to the double wall bellows (23) or the gas injection device (22).

3. The dual-fuel engine of claim 1, further comprising a cylinder head (4) and an air intake manifold (5), wherein the cylinder head (4) is covered on the cylinder sleeve (3), the cylinder head (4) is provided with a fuel gas injection passage (41) communicated with the cylinder sleeve (3), the air intake manifold (5) is communicated with the fuel gas injection passage (41), the fuel gas injection device (22) is installed in the air intake manifold (5), and the fuel gas injection device (22) is communicated with the fuel gas injection passage (41).

4. The dual fuel engine of claim 3, characterized in that the fuel system further comprises a fuel injector disposed in the cylinder head (4) and communicating with the cylinder liner (3), the first channel (81) is provided with a first inlet (811) and a first outlet (812), the first inlet (811) communicates with the fuel injector, and the first outlet (812) communicates with the fuel return line (6).

5. The dual fuel engine of claim 4, characterized in that the cylinder head (4) is further provided with a lubricating oil cooling channel, the second channel (82) is provided with a second inlet (821) and a second outlet (822), the second inlet (821) is communicated with the cylinder head lubricating oil pipeline, and the second outlet (822) is communicated with the lubricating oil cooling channel.

6. The dual fuel engine as claimed in claim 5, characterised in that a starting air inlet channel is also provided on the cylinder head (4), the third channel (83) being provided with a third inlet (831) and a third outlet (832), the third inlet (831) being in communication with the starting air line (7), the third outlet (832) being in communication with the starting air inlet channel.

7. The dual fuel engine as claimed in claim 6, further comprising a plurality of spigots (9), wherein the first passages (81) are further provided with a first manifold port (813), the multi-fluid joint (8) is provided with a plurality of, two of the first passages (81) in two adjacent multi-fluid joints (8), wherein the first manifold port (813) of one of the first passages (81) is communicated with the first outlet (812) of the other one of the first passages (81) through the spigots (9).

8. The dual fuel engine as claimed in claim 7, characterized in that a second confluence (833) is further provided on the third channel (83), and in two of the third channels (83) in two adjacent multi-fluid joints (8), the second confluence (833) of one of the third channels (83) is communicated with the third inlet (831) of the other of the third channels (83) through the spigots (9).

9. The dual fuel engine as claimed in claim 8, characterized in that the first channel (81) is detachably connectable to the spigots (9) and the fuel return line (6), the second channel (82) is detachably connectable to the head lubricating oil line, and the third channel (83) is detachably connectable to the spigots (9) and the start air line (7).

10. The dual-fuel engine of claim 3, further comprising a ejector rod sleeve (10) and a cam box (11), wherein an ejector rod sleeve insertion hole (84) is further formed in the multi-fluid connector (8), one end of the ejector rod sleeve (10) penetrates through the ejector rod sleeve insertion hole (84) to be connected with the cylinder head (4), and the other end of the ejector rod sleeve (10) is communicated with the cam box (11).

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