Dual-fuel dual-common rail system engine

Abstract

The invention discloses a dual-fuel dual-common-rail system engine which comprises a diesel oil pump, a plurality of common-rail systems, a plurality of common-rail systems and a plurality of fuel tanks, wherein a plurality of first fuel outlets are formed in one end of the diesel oil pump; a plurality of first oil inlets are formed in one end of the diesel high-pressure common rail pipe, the number of the first oil inlets is matched with that of the first oil outlets, and each first oil inlet is connected with each first oil outlet through a first oil inlet pipe; a plurality of first high-pressure oil outlets are formed in the other end of the diesel oil high-pressure common rail pipe; the diesel oil injectors are provided with first high-pressure oil inlets, the number of the diesel oil injectors is matched with that of the first high-pressure oil outlets, and the first high-pressure oil inlets are connected with the first high-pressure oil outlets through first high-pressure oil inlet pipes; a methanol oil pump; a plurality of methanol injectors; and the methanol oil return common rail pipe is provided with a plurality of oil return inlets, and oil return connecting pipes are arranged between the oil return outlets and the oil return inlets.

Description

Technical Field

[0001] The invention relates to the technical field of internal combustion engines, in particular to a dual-fuel dual common rail system engine. Background Art

[0002] Traditional engines use fossil fuels such as gasoline and diesel, which are non-renewable energy sources. They not only face energy shortages, but also face pollution problems caused by the combustion of fossil fuels. The application of clean renewable alternative fuels for engines is urgent. As a clean renewable fuel, methanol can not only be directly used in engines, but is also the material with the highest storage density of hydrogen energy to date. However, engines that use only methanol fuel have certain problems in their application.

[0003] In order to promote the application of methanol in engines, dual-fuel engines have emerged. However, the existing methanol-diesel dual-fuel engines are in the form of engine gear driving diesel oil pump, external power supply driving motor and then driving methanol oil pump. Due to the problems of large size, high cost and complex structure of external power supply driving methanol oil pump, it is difficult to apply supporting equipment and has low market competitiveness.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a dual-fuel dual common rail system engine, which can reduce the problems of large volume and high cost of the existing methanol oil pump driven by an external power source.

[0006] To achieve the above-mentioned object, the present invention provides a dual-fuel dual common rail system engine, comprising: a diesel fuel pump, one end of which is provided with a plurality of first fuel outlets; a diesel high-pressure common rail pipe, one end of which is provided with a plurality of first fuel inlets, the number of which matches the number of which matches the number of which matches the first fuel outlets, each of which is connected to each of which is connected via a first fuel inlet pipe, and the other end of which is provided with a plurality of first high-pressure fuel outlets; a plurality of diesel fuel injectors, each of which is provided with a first high-pressure fuel inlet, the number of which matches the number of which matches the first high-pressure fuel outlets, and the first high-pressure fuel inlet and the first high-pressure fuel outlet are connected via a first high-pressure fuel inlet pipe; a methanol fuel pump, one end of which is provided with a plurality of first Two oil outlets; a methanol high-pressure common rail pipe, wherein one end of the methanol high-pressure common rail pipe is provided with a plurality of second oil inlets, the number of the second oil inlets matches the number of the second oil outlets, each of the second oil inlets and each of the second oil outlets are connected by a second oil inlet pipe, and the other end of the diesel high-pressure common rail pipe is provided with a plurality of second high-pressure oil outlets; a plurality of methanol injectors, wherein the methanol injectors are provided with a second high-pressure oil inlet, the number of the methanol injectors matches the number of the second high-pressure oil outlets, and the second high-pressure oil inlet and the second high-pressure oil outlet are connected by a second high-pressure oil inlet pipe; the methanol injectors are also provided with a return oil outlet; a methanol return oil common rail pipe, wherein the methanol return oil common rail pipe is provided with a plurality of return oil inlets, and a return oil connecting pipe is provided between the return oil outlet and the return oil inlet.

[0007] In one embodiment of the present invention, one end of the diesel oil pump is connected to a diesel transmission gear, and the diesel oil pump is driven by the diesel transmission gear.

[0008] In one embodiment of the present invention, one end of the methanol oil pump is connected to a methanol transmission gear, and the methanol oil pump is driven by the methanol transmission gear.

[0009] In one embodiment of the present invention, the diesel oil pump gear is connected to the crankshaft timing gear through an idler gear.

[0010] In one embodiment of the present invention, the methanol oil pump gear is connected to the crankshaft timing gear through an idler gear.

[0011] In one embodiment of the present invention, the second oil inlet pipe, the second high-pressure oil inlet pipe, and the oil return connecting pipe are double-layer pipes.

[0012] In one embodiment of the present invention, the diesel injector returns oil through a three-way joint.

[0013] In one embodiment of the present invention, the number of the first oil outlets is two, and the number of the first oil inlets is two.

[0014] In one embodiment of the present invention, the number of the second oil outlets is two, and the number of the second oil inlet is two.

[0015] Compared with the prior art, a dual-fuel dual common rail system engine according to the present invention uses methanol and diesel as fuel at the same time, which can reduce carbon emissions during engine operation; the return oil of methanol uses a common rail pipe, which is convenient for the design of a double-layer methanol pipeline in a marine engine to prevent methanol leakage; the methanol oil pump is driven by gears, which reduces the large size and high cost of the existing methanol oil pump driven by an external power source; the crankshaft timing gear is used to synchronously drive the methanol oil pump transmission gear and the diesel oil pump transmission gear, so that the diesel oil pump and the methanol oil pump can be pressurized at the same time and synchronously supply oil without uneven mixing. Using a mechanical structure to drive the methanol oil pump and the diesel oil pump has a simple solution and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a dual-fuel dual common rail system engine according to an embodiment of the present invention;

[0017] Description of main reference numerals:

[0018] 1-diesel fuel pump, 11-first fuel outlet, 12-diesel transmission gear, 2-diesel high-pressure common rail pipe, 21-first fuel inlet, 22-first fuel inlet pipe, 23-first high-pressure fuel outlet, 3-diesel fuel injector, 31-first high-pressure fuel inlet, 32-first high-pressure fuel inlet pipe, 4-methanol fuel pump, 41-second fuel outlet, 42-methanol transmission gear, 5-methanol high-pressure common rail pipe, 51-second fuel inlet, 52-second fuel inlet pipe, 53-second high-pressure fuel outlet, 6-methanol fuel injector, 61-second high-pressure fuel inlet, 62-second high-pressure fuel inlet pipe, 63-return oil outlet, 7-methanol return oil common rail pipe, 71-return oil inlet, 72-return oil connecting pipe, 8-idle gear, 9-crankshaft timing gear. DETAILED DESCRIPTION

[0019] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0020] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0021] like Figure 1As shown, a dual-fuel dual common rail system engine according to a preferred embodiment of the present invention includes: a diesel fuel pump 1, wherein one end of the diesel fuel pump 1 is provided with a plurality of first fuel outlets 11; a diesel high-pressure common rail pipe 2, wherein one end of the diesel high-pressure common rail pipe 2 is provided with a plurality of first fuel inlets 21, wherein the number of the first fuel inlets 21 matches the number of the first fuel outlets 11, and each of the first fuel inlets 21 is connected to each of the first fuel outlets 11 via a first fuel inlet pipe 22, and the other end of the diesel high-pressure common rail pipe 2 is provided with a plurality of first high-pressure fuel outlets 23; a plurality of diesel fuel injectors 3, wherein the diesel fuel injectors 3 are provided with a first high-pressure fuel inlet 31, wherein the number of the diesel fuel injectors 3 matches the number of the first high-pressure fuel outlets 23, and the first high-pressure fuel inlet 31 is connected to the first high-pressure fuel outlet 23 via a first high-pressure fuel inlet pipe 32; and a methanol fuel pump 4, wherein one end of the methanol fuel pump 4 is provided with a plurality of second fuel outlets 41; a methanol high-pressure common rail pipe 5, wherein one end of the methanol high-pressure common rail pipe 5 is provided with a plurality of second oil inlets 51, the number of the second oil inlets 51 matches the number of the second oil outlets 41, each of the second oil inlets 51 is connected to each of the second oil outlets 41 via a second oil inlet pipe 52, and the other end of the diesel high-pressure common rail pipe 2 is provided with a plurality of second high-pressure oil outlets 53; a plurality of methanol injectors 6, wherein the methanol injectors 6 are provided with a second high-pressure oil inlet 61, the number of the methanol injectors 6 matches the number of the second high-pressure oil outlets 53, the second high-pressure oil inlet 61 is connected to the second high-pressure oil outlet 53 via a second high-pressure oil inlet pipe 62; the methanol injectors 6 are also provided with a return oil outlet 63; a methanol return oil common rail pipe 7, wherein the methanol return oil common rail pipe 7 is provided with a plurality of return oil inlets 71, and a return oil connecting pipe 72 is provided between the return oil outlet 63 and the return oil inlet 71.

[0022] Specifically, the plurality of first oil inlets 21 are connected one by one with the plurality of first oil outlets 11 through the first oil inlet pipes 22 equal to the number thereof. The plurality of second oil inlets 51 are connected one by one with the plurality of second oil outlets 41 through the second oil inlet pipes 52 equal to the number thereof. The plurality of first high-pressure oil outlets 23 and the plurality of first high-pressure oil inlets 31 are connected one by one through the plurality of first high-pressure oil inlet pipes 32. The plurality of second high-pressure oil outlets 53 and the plurality of second high-pressure oil inlets 61 are connected one by one through the plurality of second high-pressure oil inlet pipes 62. Each oil inlet is connected to one oil outlet pipe only through one oil inlet pipe. One end of the diesel oil pump 1 is connected to the diesel oil tank, and can pressurize and pump the diesel oil transported by the diesel oil tank. The diesel oil pump 1 can transmit the diesel oil into the diesel high-pressure common rail pipe 2 through the first oil outlet 11, and the diesel oil flows into the diesel injector 3 through the diesel high-pressure common rail pipe 2, and then the diesel oil is sprayed out. One end of the methanol oil pump 4 is connected to the methanol oil tank, and can pressurize and pump the methanol transported by the methanol oil tank. The methanol oil pump 4 can transfer methanol into the methanol high-pressure common rail pipe 5 through the second oil outlet 41, and the methanol flows into the methanol injector 6 through the methanol high-pressure common rail pipe 5, and then the methanol is sprayed out. The methanol accumulated in the methanol injector 6 can be returned to the methanol return oil supply pipe through the return oil outlet 63. As a preferred embodiment, a fixer is provided between the second high-pressure oil inlet pipe and the return oil connecting pipe connected to the same methanol injector, which is used to fix the second high-pressure oil inlet pipe and the return oil connecting pipe, so that the connection between the pipelines is more concise.

[0023] As an optional implementation, one end of the diesel oil pump 1 is connected to a diesel transmission gear 12 , and the diesel oil pump 1 is driven by the diesel transmission gear 12 .

[0024] Specifically, the diesel oil pump 1 is driven by the power transmitted by the diesel transmission gear 12. The crankshaft timing gear 9 drives the idle gear 8, and the idle gear 8 drives the methanol transmission gear 42 and the diesel transmission gear 12 to rotate synchronously, so that the methanol oil pump 4 and the diesel oil pump 1 are pressurized at the same time, and finally, during the use of the engine, the methanol and diesel can be sprayed synchronously and quickly, which is conducive to the uniform mixing and use of methanol and diesel. If you want to adjust the ratio of methanol and diesel, you only need to adjust the radius ratio of the gears on the diesel oil pump 1 and the methanol oil pump 4, so that the two oil pumps can be pressurized at different efficiencies. Through the difference in pressurization efficiency and the control of the injection amount of the injector, diesel and methanol can be mixed in different proportions, and the operation is simple.

[0025] As an optional implementation manner, one end of the methanol oil pump 4 is connected to a methanol transmission gear 42 , and the methanol oil pump 4 is driven by the methanol transmission gear 42 .

[0026] Specifically, the methanol oil pump 4 is driven by the power of the methanol transmission gear 42 , which can greatly reduce the volume and cost of the oil pump compared to a solution in which an external power supply and an electric motor are used to drive the methanol oil pump 4 .

[0027] As an optional implementation, the gear of the diesel oil pump 1 is connected to the crankshaft timing gear 9 via an idler gear 8 .

[0028] Specifically, when the engine is running, the crankshaft timing gear 9 drives the idler gear 8, and then the idler gear 8 drives the diesel oil pump 1 gear, and the diesel oil pump 1 gear drives the camshaft in the diesel oil pump 1 to lift the plunger and pump the diesel into the oil rail.

[0029] As an optional implementation, the gear of the methanol oil pump 4 is connected to the crankshaft timing gear 9 via an idler gear 8 .

[0030] Specifically, an oil pump gear is further provided between the diesel oil pump 1 gear and the idle gear 8. When the engine is running, the crankshaft timing gear 9 drives the idle gear 8, and then the idle gear 8 drives the oil pump gear, thereby driving the methanol oil pump 4 gear, and finally drives the camshaft in the methanol oil pump 4 through the methanol oil pump 4 gear, lifts the plunger, and pumps methanol into the oil rail.

[0031] As an optional implementation, the second oil inlet pipe 52 , the second high-pressure oil inlet pipe 62 , and the oil return connecting pipe 72 are double-layer pipes.

[0032] Specifically, the pipeline through which the methanol flows is a double-layer pipeline, and a leakage sensor is provided inside the outer pipeline. Due to the design of the double-layer pipeline, when methanol leaks from the inner pipeline, the outer pipeline can prevent the methanol from further leaking into the air. At the same time, the leakage sensor in the outer pipeline will sound an alarm to remind maintenance personnel to deal with it in time to prevent the methanol from further leaking from the outer pipeline.

[0033] As an optional implementation, the diesel injector 3 returns oil through a three-way joint.

[0034] Specifically, one end of each of the plurality of diesel fuel injectors 3 is connected to a diesel fuel return pipe, which is connected to the same diesel fuel return main pipe through a three-way joint and finally returns the fuel to the diesel fuel tank.

[0035] As an optional implementation, the number of the first oil outlets 11 is two, and the number of the first oil inlet 21 is two.

[0036] As an optional implementation, the number of the second oil outlets 41 is two, and the number of the second oil inlet 51 is two.

[0037] Specifically, there are two first oil outlets 11 and two second oil outlets 41 for increasing the oil intake.

[0038] By adopting the above technical scheme, a dual-fuel dual common rail system engine is provided, which uses methanol and diesel as fuel at the same time, and can reduce carbon emissions during engine operation; the return oil of methanol uses a common rail pipe, which is convenient for the design of methanol double-layer pipelines in marine engines and prevents methanol leakage; the methanol oil pump 4 is driven by gears, which reduces the large volume and high cost of the existing methanol oil pump 4 driven by an external power source; the crankshaft timing gear 9 is used to synchronously drive the transmission gear of the methanol oil pump 4 and the transmission gear of the diesel oil pump 1, so that the diesel oil pump 1 and the methanol oil pump 4 can be pressurized at the same time and synchronously supply oil, and there will be no uneven mixing. Using a mechanical structure to drive the methanol oil pump 4 and the diesel oil pump 1 is simple and low-cost.

[0039] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A dual-fuel dual common rail system engine, characterized in that: include: A diesel oil pump, wherein one end of the diesel oil pump is provided with a plurality of first oil outlets; A diesel high-pressure common rail pipe, wherein one end of the diesel high-pressure common rail pipe is provided with a plurality of first oil inlets, the number of the first oil inlets matches the number of the first oil outlets, each of the first oil inlets is connected to each of the first oil outlets via a first oil inlet pipe, and the other end of the diesel high-pressure common rail pipe is provided with a plurality of first high-pressure oil outlets; A plurality of diesel fuel injectors, each of which is provided with a first high-pressure fuel inlet, the number of the diesel fuel injectors matches the number of the first high-pressure fuel outlets, and the first high-pressure fuel inlet and the first high-pressure fuel outlet are connected via a first high-pressure fuel inlet pipe; A methanol oil pump, wherein one end of the methanol oil pump is provided with a plurality of second oil outlets; A methanol high-pressure common rail pipe, wherein one end of the methanol high-pressure common rail pipe is provided with a plurality of second oil inlets, the number of the second oil inlets matches the number of the second oil outlets, each of the second oil inlets is connected to each of the second oil outlets via a second oil inlet pipe, and the other end of the diesel high-pressure common rail pipe is provided with a plurality of second high-pressure oil outlets; A plurality of methanol fuel injectors, each of which is provided with a second high-pressure oil inlet, the number of the methanol fuel injectors matches the number of the second high-pressure oil outlets, the second high-pressure oil inlet and the second high-pressure oil outlet are connected via a second high-pressure oil inlet pipe, and the methanol fuel injector is further provided with an oil return outlet; A methanol oil return common rail pipe is provided with a plurality of oil return inlets, and an oil return connecting pipe is provided between the oil return outlet and the oil return inlet.

2. A dual-fuel dual common rail system engine as claimed in claim 1, characterized in that: One end of the diesel oil pump is connected to a diesel transmission gear, and the diesel oil pump is driven by the diesel transmission gear.

3. A dual-fuel dual common rail system engine as claimed in claim 1, characterized in that: One end of the methanol oil pump is connected to a methanol transmission gear, and the methanol oil pump is driven by the methanol transmission gear.

4. A dual-fuel dual common rail system engine as claimed in claim 2, characterized in that: The diesel oil pump gear is connected to the crankshaft timing gear through an idler gear.

5. A dual-fuel dual common rail system engine as claimed in claim 3, characterized in that: The methanol oil pump gear is connected to the crankshaft timing gear through an idler gear.

6. A dual-fuel dual common rail system engine as claimed in claim 1, characterized in that: The second oil inlet pipe, the second high-pressure oil inlet pipe, and the oil return connecting pipe are double-layer pipes.

7. A dual-fuel dual common rail system engine as claimed in claim 1, characterized in that: The diesel fuel injector returns oil through a three-way joint.

8. The dual-fuel dual common rail system engine according to claim 1, characterized in that: The number of the first oil outlets is two, and the number of the first oil inlets is two.

9. A dual-fuel dual common rail system engine as claimed in claim 1, characterized in that: The number of the second oil outlets is two, and the number of the second oil inlets is two.

Images