A dual fuel dual common rail system engine

Abstract

The application discloses a dual-fuel dual-common-rail system engine, which comprises a diesel oil pump, a plurality of first oil outlets are arranged at one end of the diesel oil pump, a diesel high-pressure common rail pipe, a plurality of first oil inlets are arranged at one end of the diesel high-pressure common rail pipe, the number of the first oil inlets matches the number of the first oil outlets, a first oil inlet and a first oil outlet are connected through a first oil inlet pipe, a plurality of first high-pressure oil outlets are arranged at the other end of the diesel high-pressure common rail pipe, a diesel oil injector is provided with a first high-pressure oil inlet, the number of the diesel oil injectors matches the number of the first high-pressure oil outlets, the first high-pressure oil inlet and the first high-pressure oil outlet are connected through a first high-pressure oil inlet pipe, a methanol oil pump, a plurality of methanol oil injectors, and a methanol oil return common rail pipe, the methanol oil return common rail pipe is provided with a plurality of oil return inlets, and an oil return connecting pipe is arranged between the oil return inlets and the oil return outlets.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of internal combustion engines, and particularly relates to a dual-fuel dual-common-rail system engine. BACKGROUND

[0002] The fuel used by traditional engines is fossil fuel gasoline and diesel, which belongs to non-renewable energy. The engines need to face not only the problem of energy shortage, but also the problem of pollution after burning fossil fuel. The application of clean and renewable alternative fuels for engines is imminent. As a clean and renewable fuel, methanol can be directly used in engines, and is the material with the highest storage density of hydrogen energy so far. However, there are certain problems in the application of engines using pure methanol fuel.

[0003] In order to promote the application of methanol in engines, dual-fuel engines appear. However, the existing methanol-diesel dual-fuel engine is in the form of engine gear driving diesel oil pump and external power driving motor driving methanol oil pump. Since the external power driving methanol oil pump has the problems of large volume, high cost and complex structure, it causes the difficulties in matching application and small market competitiveness.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as admitting that the information constitutes prior art for the present application. SUMMARY

[0005] The present application aims to provide a dual-fuel dual-common-rail system engine, which can reduce the problems of large volume and high cost of the existing external power driving methanol oil pump.

[0006] To achieve the above object, the application provides a dual-fuel dual-common rail system engine, comprising: a diesel oil pump, one end of which is provided with a plurality of first oil outlets; a diesel high-pressure common rail pipe, one end of which is provided with a plurality of first oil inlets, the number of the first oil inlets matching the number of the first oil outlets, each of the first oil inlets and each of the first oil outlets being connected by a first oil inlet pipe, the other end of the diesel high-pressure common rail pipe being provided with a plurality of first high-pressure oil outlets; a plurality of diesel injectors, each of which is provided with a first high-pressure oil inlet, the number of the diesel injectors matching the number of the first high-pressure oil outlets, the first high-pressure oil inlets and the first high-pressure oil outlets being connected by a first high-pressure oil inlet pipe; a methanol oil pump, one end of which is provided with a plurality of second oil outlets; a methanol high-pressure common rail pipe, one end of which is provided with a plurality of second oil inlets, the number of the second oil inlets matching the number of the second oil outlets, each of the second oil inlets and each of the second oil outlets being connected by a second oil inlet pipe, the other end of the diesel high-pressure common rail pipe being provided with a plurality of second high-pressure oil outlets; a plurality of methanol injectors, each of which is provided with a second high-pressure oil inlet, the number of the methanol injectors matching the number of the second high-pressure oil outlets, the second high-pressure oil inlets and the second high-pressure oil outlets being connected by a second high-pressure oil inlet pipe; the methanol injectors being further provided with a return oil outlet; a methanol return oil common rail pipe, provided with a plurality of return oil inlets, the return oil outlet and the return oil inlets being provided with a return oil connecting pipe.

[0007] In an embodiment of the application, one end of the diesel oil pump is connected with a diesel transmission gear, and the diesel oil pump is driven by the diesel transmission gear.

[0008] In an embodiment of the application, one end of the methanol oil pump is connected with a methanol transmission gear, and the methanol oil pump is driven by the methanol transmission gear.

[0009] In an embodiment of the application, the diesel oil pump gear is connected with a crankshaft timing gear through an idle gear.

[0010] In an embodiment of the application, the methanol oil pump gear is connected with a crankshaft timing gear through an idle gear.

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

[0012] In an embodiment of the application, the diesel injectors return oil through a three-way joint.

[0013] In an embodiment of the application, the first oil outlet is two, and the first oil inlet is two.

[0014] In an embodiment of the present application, the second oil outlet is two, and the second oil inlet is two.

[0015] Compared with the prior art, the dual-fuel dual-common rail system engine according to the present application can reduce carbon emissions during engine operation by simultaneously using methanol and diesel as fuel; the methanol return oil uses a common rail pipe, which facilitates the design of a methanol double-layer pipe in a marine engine and prevents methanol leakage; the methanol oil pump is driven by a gear, which reduces the problem of large size and high cost of the existing external power-driven methanol oil pump; the crankshaft timing gear synchronously drives 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 simultaneously pressurized and synchronously supplied with oil, and uneven mixing will not occur. The use of a mechanical structure to drive the methanol oil pump and the diesel oil pump is simple and low in cost. BRIEF DESCRIPTION OF DRAWINGS

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

[0017] MAIN REFERENCE NUMERALS EXPLANATION:

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

[0019] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments.

[0020] Unless otherwise explicitly indicated, throughout the specification and claims, the term "comprise" or its variants such as "comprises" or "comprising" will be understood to encompass the stated element or elements or components, but not to exclude the presence of other elements or components.

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

[0022] Specifically, the first oil inlet 21 is connected with the first oil outlet 11 through the first oil inlet pipe 22. The second oil inlet 51 is connected with the second oil outlet 41 through the second oil inlet pipe 52. The first high-pressure oil outlet 23 is connected with the first high-pressure oil inlet 31 through the first high-pressure oil inlet pipe 32. The second high-pressure oil outlet 53 is connected with the second high-pressure oil inlet 61 through the second high-pressure oil inlet pipe 62. Each oil inlet is connected with one oil outlet through one oil inlet pipe. The diesel oil pump 1 is connected with the diesel oil tank, and can pressurize and pump the diesel oil delivered by the diesel oil tank. The diesel oil pump 1 can deliver the diesel oil to 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 is sprayed out. The methanol oil pump 4 is connected with the methanol tank, and can pressurize and pump the methanol delivered by the methanol tank. The methanol oil pump 4 can deliver the methanol to 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 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 fixing device is arranged between the second high-pressure oil inlet pipe and the return oil connection pipe connected with the same methanol injector, for fixing the second high-pressure oil inlet pipe and the return oil connection pipe, so that the connection between the pipes is more simple.

[0023] As an optional embodiment, the diesel oil pump 1 is connected with the diesel transmission gear 12, and 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 idler gear 8, and the idler 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 can spray out the methanol and the diesel synchronously and rapidly in the use process of the engine, which is beneficial to the uniform mixing and use of the methanol and the diesel. If it is desired to adjust the ratio of the methanol and the diesel, it is only needed 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, and through the different pressurization efficiencies and the control of the oil injection amount of the injector, the methanol and the diesel can be mixed at different ratios, and the operation is simple.

[0025] As an optional embodiment, the methanol oil pump 4 is connected with the methanol transmission gear 42, and 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 size and cost of the oil pump compared to the scheme of external power supply and electric motor to drive the methanol oil pump 4.

[0027] As an optional embodiment, the diesel oil pump 1 gear is connected with the crankshaft timing gear 9 through the idler gear 8.

[0028] Specifically, during engine operation, the crankshaft timing gear 9 drives the idler gear 8, and then the idler gear 8 drives the diesel oil pump 1 gear, which drives the camshaft in the diesel oil pump 1, lifts the plunger, and pumps diesel into the oil rail.

[0029] As an optional embodiment, the methanol oil pump 4 gear is connected with the crankshaft timing gear 9 through the idler gear 8.

[0030] Specifically, an oil pump gear is also provided between the diesel oil pump 1 gear and the idler gear 8. During engine operation, the crankshaft timing gear 9 drives the idler gear 8, and then the idler gear 8 drives the oil pump gear, thereby driving the methanol oil pump 4 gear, and finally driving the camshaft in the methanol oil pump 4 through the methanol oil pump 4 gear, lifting the plunger, and pumping methanol into the oil rail.

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

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

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

[0034] Specifically, one end of each of the plurality of diesel oil injectors 3 is connected with a diesel oil return pipe, the diesel oil return pipes are connected into the same diesel oil return main pipe through a three-way joint, and finally return oil to the diesel oil tank.

[0035] As an optional embodiment, the first oil outlet 11 is two, and the first oil inlet 21 is two.

[0036] As an optional embodiment, the second oil outlet 41 is two, and the second oil inlet 51 is two.

[0037] Specifically, the first oil outlet 11 and the second oil outlet 41 are two, for improving the oil intake.

[0038] With the above technical scheme, a dual-fuel dual common rail system engine is provided, which uses methanol and diesel as fuel, can reduce carbon emissions during engine operation; the methanol return oil uses a common rail pipe, which is convenient for the design of the methanol double-layer pipe in the marine engine and prevents methanol leakage; the methanol oil pump 4 is driven by a gear, which reduces the problem of large size and high cost of the existing external power-driven methanol oil pump 4; the crankshaft timing gear 9 is used to synchronously drive the methanol oil pump 4 transmission gear and the diesel oil pump 1 transmission gear, 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 the uneven mixing situation does not occur. The mechanical structure is used to drive the methanol oil pump 4 and the diesel oil pump 1, which is simple in scheme and low in cost.

[0039] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the application. The exemplary embodiments are chosen and described in order to explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the scope of the application be defined by the claims and their equivalents.

Claims

1. A dual-fuel dual common rail system engine characterized in that, include: A diesel fuel pump, wherein one end of the diesel fuel pump is provided with multiple 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 first oil inlets matching the number of first oil outlets, each first oil inlet and each first oil outlet being connected by 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. Multiple diesel injectors, each diesel injector having a first high-pressure fuel inlet, the number of diesel injectors matching the number of the first high-pressure fuel outlets, the first high-pressure fuel inlet and the first high-pressure fuel outlet being connected by a first high-pressure fuel inlet pipe; A methanol oil pump, wherein one end of the methanol oil pump is provided with multiple second oil outlets; A methanol high-pressure common rail pipe, wherein one end of the methanol high-pressure common rail pipe is provided with multiple second oil inlets, the number of the second oil inlets being matched with the number of the second oil outlets, and each second oil inlet and each second oil outlet being connected by a second oil inlet pipe; and the other end of the diesel high-pressure common rail pipe is provided with multiple second high-pressure oil outlets. Multiple methanol injectors are provided, each methanol injector is provided with a second high-pressure oil inlet, the number of methanol injectors is matched with the number of the second high-pressure oil outlets, the second high-pressure oil inlet and the second high-pressure oil outlet are connected by a second high-pressure oil inlet pipe, and the methanol injector is also provided with a return oil outlet. A methanol return oil common rail pipe is provided, wherein the methanol return oil common rail pipe is provided with multiple return oil inlets, and a return oil connecting pipe is provided between the return oil outlet and the return oil inlets; The methanol oil pump is connected to a methanol drive gear at one end, and the methanol oil pump is driven by the methanol drive gear. The diesel fuel pump gear is connected to the crankshaft timing gear via an idler gear; The methanol oil pump gear is connected to the crankshaft timing gear via an idler gear.

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

3. A dual fuel dual common rail system engine as claimed in claim 1 wherein, The second oil inlet pipe, the second high-pressure oil inlet pipe, and the return oil connection pipe are double-layered pipes.

4. A dual fuel dual common rail system engine as claimed in claim 1 wherein, The diesel injector returns oil through a tee connector.

5. A dual fuel dual common rail system engine as claimed in claim 1 wherein, There are two first oil outlets and two first oil inlets.

6. A dual fuel dual common rail system engine as claimed in claim 1 wherein, There are two second oil outlets and two second oil inlets.

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