阅读说明：本技术 一种甲醇/柴油双燃料发动机喷油泵 (Methanol/diesel dual-fuel engine fuel injection pump ) 是由 朱建军 张步勇 左振宇 于 2020-05-14 设计创作，主要内容包括：本发明属于发动机喷油泵领域,具体是一种甲醇/柴油双燃料发动机喷油泵。解决如何将同时给发动机泵甲醇与柴油的问题,包括柴油燃料油轨、强制润滑控制阀、甲醇燃料油轨、甲醇喷油器、柴油喷油器、柴油燃料箱、甲醇燃料箱和喷油泵总体,喷油泵总体的柴油泵油部的柴油燃料出油口与柴油燃料油轨的进油口连通,柴油燃料油轨的回油口与柴油燃料箱连通,柴油燃料箱接柴油泵油部的柴油燃料进油口；喷油泵总体的甲醇泵油部中甲醇柱塞的环状楔形槽、甲醇燃料出油口和甲醇燃料进油口分别与强制润滑控制阀的出油口、甲醇燃料油轨的的进油口和甲醇燃料箱连通,强制润滑控制阀进油口与柴油燃料油轨的出油口连通,甲醇燃料油轨的回油口与甲醇燃料箱连通。(The invention belongs to the field of engine fuel injection pumps, and particularly relates to a methanol/diesel dual-fuel engine fuel injection pump. The problem of how to pump methanol and diesel oil to an engine at the same time is solved, and the problem comprises a diesel fuel rail, a forced lubrication control valve, the methanol fuel rail, a methanol injector, a diesel fuel tank, the methanol fuel tank and a fuel injection pump assembly, wherein a diesel fuel oil outlet of a diesel pump oil part of the fuel injection pump assembly is communicated with an oil inlet of the diesel fuel rail, an oil return port of the diesel fuel rail is communicated with the diesel fuel tank, and the diesel fuel tank is connected with a diesel fuel oil inlet of the diesel pump oil part; the annular wedge-shaped groove, the methanol fuel oil outlet and the methanol fuel oil inlet of a methanol plunger in the oil part of the methanol pump of the fuel injection pump are respectively communicated with the oil outlet of a forced lubrication control valve, the oil inlet of a methanol fuel oil rail and a methanol fuel tank, the oil inlet of the forced lubrication control valve is communicated with the oil outlet of a diesel fuel oil rail, and the oil return port of the methanol fuel oil rail is communicated with the methanol fuel tank.)

1. An injection pump assembly, comprising: including the oil spout pump body (18) and injection pump lid (23), install on the oil spout pump body (18) injection pump lid (23), injection pump lid (23) and the inside cavity A and the cavity B that is formed with jointly of the oil spout pump body (18), be provided with diesel pump oil portion (11) and methyl alcohol pump oil portion (10) in cavity A and the cavity B respectively, injection pump lid (23) both sides set up and are provided with diesel fuel oil inlet (A1) and methyl alcohol fuel oil inlet (A4) respectively, diesel fuel oil inlet (A1) and the diesel oil plunger matching parts cavity A intercommunication of placing diesel pump oil portion (11), methyl alcohol fuel oil inlet (A4) and the methyl alcohol plunger matching parts cavity B intercommunication of placing methyl alcohol pump oil portion (10), install on injection pump camshaft (9) diesel oil pump oil portion (11) and methyl alcohol pump oil portion (10) bottom.

2. The fuel injection pump assembly of claim 1, wherein: the methanol pump oil part (10) comprises a sealing washer B (30), an oil outlet valve fastening seat B (27), an oil outlet valve spring B (26), an oil outlet valve seat B (29), an oil outlet valve B (28), a methanol plunger sleeve (32), a methanol plunger (31), a plunger spring B (33), a lower plunger spring seat B (34), an oil supply timing adjusting screw B (35), an oil supply timing screw locking nut B (36) and a tappet B (37), the methanol plunger sleeve (32) is arranged in the cavity B, the methanol plunger (31) is arranged in the methanol plunger sleeve (32), a plunger cavity formed by the methanol plunger sleeve (32) and the methanol plunger (31) is communicated with a methanol fuel oil inlet (A4), the bottom of the methanol plunger (31) is connected with the lower plunger B (34), the lower part of the lower plunger spring seat B (34) is connected with the oil supply timing adjusting screw B (35), and the lower part of the oil supply timing adjusting screw B (35) is sequentially screwed into the oil supply timing locking nut B (36) and the tappet B (37) (37) The bottom of the tappet B (37) is connected with a cam shaft (9) of the fuel injection pump; the oil outlet valve B (28) is connected at methanol plunger (31) top, install on oil outlet valve seat B (29) oil outlet valve B (28), oil outlet valve seat B (29) upper portion sets up the tight seat B (27) of oil outlet valve, oil outlet valve seat B (29) sets up seal ring B (30) with the tight seat B (27) hookup location of oil outlet valve, the tight seat B (27) inside cavity of oil outlet valve sets up oil outlet valve spring B (26), oil outlet valve spring B (26) bottom sets up on oil outlet valve B (28), the tight seat B (27) inside of oil outlet valve is supported at oil outlet valve spring B (26) top, the tight seat B (27) top of oil outlet valve is provided with methanol fuel oil-out (A3).

3. The fuel injection pump assembly of claim 2, wherein: an annular wedge-shaped groove (A5) is formed in the inner wall of the methanol plunger sleeve (32), the diameter of the annular wedge-shaped groove (A5) is large when the annular wedge-shaped groove is close to the top of the methanol plunger (31), and the diameter of the annular wedge-shaped groove is small when the annular wedge-shaped groove is far away from the top of the methanol plunger (31).

4. The fuel injection pump assembly of claim 3, wherein: the lubricating oil spraying pump is characterized in that a forced lubricating oil hole (A6) is formed in the oil spraying pump cover (23), a self-lubricating pipe joint (39) is arranged in the forced lubricating oil hole (A6), the self-lubricating pipe joint (39) is fastened through a locking nut (38), and the self-lubricating pipe joint (39) penetrates through a cavity between a methanol plunger sleeve (32) and a methanol plunger (31) to be communicated.

5. The fuel injection pump assembly of claim 4, wherein: the diesel pump oil part (11) comprises a sealing washer A (20), an oil outlet valve fastening seat A (24), an oil outlet valve spring A (25), an oil outlet valve seat A (21), an oil outlet valve A (22), a diesel plunger sleeve (19), a diesel plunger (17), a plunger spring A (16), a lower plunger spring seat A (15), an oil supply timing adjusting screw A (14), an oil supply timing screw locking nut A (13) and a tappet A (12), the diesel plunger sleeve (19) is arranged in the cavity A, the diesel plunger (17) is arranged in the diesel plunger sleeve (19), a plunger cavity formed by the diesel plunger sleeve (19) and the diesel plunger (17) is communicated with a diesel fuel oil inlet (A1), the bottom of the diesel plunger (17) is connected with the lower plunger A (15), the lower part of the lower plunger spring seat A (15) is connected with the oil supply timing adjusting screw A (14), and the lower part of the oil supply timing adjusting screw A (14) is sequentially screwed into the oil supply timing locking nut A (13) and the tappet A (13) (12) The bottom of the tappet A (12) is connected with a cam shaft (9) of an oil injection pump; an oil outlet valve A (22) is connected to the top of a diesel plunger (17), the oil outlet valve A (22) is installed on an oil outlet valve seat A (21), an oil outlet valve tight seat A (24) is arranged on the upper portion of the oil outlet valve seat A (21), a sealing gasket A (20) is arranged at the connection position of the oil outlet valve seat A (21) and the oil outlet valve tight seat A (24), an oil outlet valve spring A (25) is arranged in a cavity inside the oil outlet valve tight seat A (24), the bottom of the oil outlet valve spring A (25) is arranged on the oil outlet valve A (22), the top of the oil outlet valve spring A (25) supports the inside of the oil outlet valve tight seat A (24), and a diesel fuel oil outlet port (A2) is arranged at the top of the oil outlet valve tight seat.

6. A methanol-diesel oil dual injection engine fuel injection pump is characterized in that: the methanol fuel injection system comprises a diesel fuel rail (1), a forced lubrication control valve (2), a methanol fuel rail (3), a methanol fuel injector (4), a diesel fuel injector (5), a diesel fuel tank (6), a methanol fuel tank (7) and the fuel injection pump assembly (8) of claim 5, wherein a diesel fuel outlet (A2) in a diesel pump oil part (11) of the fuel injection pump assembly (8) is communicated with an oil inlet of the diesel fuel rail (1), an oil return port of the diesel fuel rail (1) is communicated with the diesel fuel tank (6), and the diesel fuel tank (6) is connected with a diesel fuel inlet (A1) of the diesel pump oil part (11); an annular wedge-shaped groove (A5), a methanol fuel oil outlet (A3) and a methanol fuel oil inlet (A4) of a methanol plunger sleeve (32) in a methanol pump oil part (10) of an oil injection pump body (8) are respectively communicated with an oil outlet (A11) of a forced lubrication control valve (2), an oil inlet of a methanol fuel oil rail (3) and a methanol fuel tank (7), an oil inlet (A8) of the forced lubrication control valve (2) is communicated with an oil outlet of a diesel fuel oil rail (1), and an oil return port of the methanol fuel oil rail (3) is communicated with the methanol fuel tank (7).

7. The methanol-diesel dual injection engine injection pump of claim 6, wherein: the forced lubrication control valve (2) comprises a valve core spring (40), a valve core (41), a sealing ring I (42), an upper end cover (43), a spring seat (44), an adjusting screw (45), a sealing ring II (46), a plunger spring (47), a plunger (48), a valve body (49), a lower end cover (50) and a valve body joint (51), wherein the valve body (49) is of a three-way structure, the lower end cover (50) is arranged at a port at the lower end of the valve body (49), the upper end cover (43) is arranged at a port at the upper end of the valve body (49), the plunger (48) is arranged in a through hole formed in the upper part and the lower part of the valve body (49), an oil return port (A7) and an oil inlet (A8) communicated with the through hole are arranged on the valve body (49), the lower end of the plunger (48) is in contact connection with the lower end cover (50, a sealing ring II (46) is arranged between the spring seat (44) and the valve body (49), the upper portion of the spring seat (44) is connected with an adjusting screw (45), the adjusting screw (45) is screwed on the upper end cover (43), a valve body joint (51) is inserted into an oil outlet channel (A10) on the left side of the valve body (49), an oil outlet (A11) is arranged on the left side of the valve body joint (51), a valve core (41) is arranged in the valve body joint (51), a valve core spring (40) is arranged between the valve core (41) and the valve body joint (51), and a sealing ring I (42) is arranged on the.

8. The methanol-diesel dual injection engine injection pump of claim 7, wherein: an oil inlet (A8) on the forced lubrication control valve (2) is close to the lower end cover (50), an oil return port (A7) is close to the upper end cover (43), a pressure balance oil duct (A9) is further arranged on the forced lubrication control valve (2), the pressure balance oil duct (A9) is a small hole parallel to the plunger cavity and is located right below the oil outlet duct (A10), the upper end of the pressure balance oil duct (A9) is communicated with the oil outlet duct (A10), and the lower end of the pressure balance oil duct (A9) is communicated with the bottom cavity of the plunger (48).

Technical Field

The invention belongs to the field of engine fuel injection pumps, and particularly relates to a methanol/diesel dual-fuel engine fuel injection pump.

Background

The conventional engine uses fossil fuel gasoline and diesel oil, which are non-renewable energy sources, and thus faces the problem of energy shortage and the problem of pollution caused by burning of fossil fuel. The application of clean and renewable alternative fuels of engines is urgent, and currently, methanol as a clean and renewable fuel can be directly applied to the engines, is a material with the highest storage density of hydrogen energy so far, is known as 'liquid sunlight', and is certainly to become the middle and hard power of future energy.

Research on the clean renewable fuel methanol as a fuel for internal combustion engines instead of the fossil fuels gasoline and diesel has been numerous and has achieved some success. However, the application of pure methanol fuel to an engine has certain problems, the boiling point of the methanol is low, and the methanol is easy to evaporate on an oil pipe or an air inlet channel to form air resistance; the methanol has high vaporization latent heat, large heat absorption capacity during vaporization and difficult low-temperature start; the viscosity of the methanol is low, so that an oil supply pump and a plunger of the diesel engine cannot be well lubricated, the plunger and barrel assembly is quickly abraded, the gap between the plunger and barrel assembly is increased, and the methanol in a plunger cavity can be leaked to a camshaft box body along the gap to dilute lubricating oil and further aggravate the abrasion of other moving parts.

In order to promote the application of methanol to engines, dual-fuel engines have come along, wherein the dual-fuel homogeneous compression ignition engine using diesel to ignite methanol is easy to implement, does not need to greatly modify the structure of the engine, and is easy to operate. However, because methanol has low viscosity and is corrosive, the fuel injection pump of the methanol/diesel dual-fuel engine is particularly important.

Disclosure of Invention

The invention provides a methanol/diesel dual-fuel engine fuel injection pump, which aims to solve the problems of how to simultaneously pump methanol fuel and diesel fuel to an engine, how to stably lubricate a methanol plunger and barrel assembly by using diesel pumped by the fuel injection pump, and how to realize a high-viscosity fuel self-lubricating low-viscosity fuel plunger and barrel assembly of the fuel injection pump of the dual-fuel engine.

The invention adopts the following technical scheme: the utility model provides a fuel injection pump totality, including the fuel injection pump body and fuel injection pump lid, the fuel injection pump lid is installed on the fuel injection pump body, fuel injection pump lid and inside cavity A and the cavity B of being formed with jointly of fuel injection pump body, be provided with diesel pump oil portion and methyl alcohol pump oil portion in cavity A and the cavity B respectively, fuel injection pump lid both sides set up and are provided with diesel fuel oil inlet and methyl alcohol fuel oil inlet respectively, diesel fuel oil inlet and the cavity A intercommunication of placing diesel pump oil portion, methyl alcohol fuel oil inlet and the cavity B intercommunication of placing methyl alcohol pump oil portion, install on the fuel injection pump camshaft diesel oil portion and methyl alcohol pump oil portion bottom.

Further, the methanol pump oil part comprises a sealing washer B, an oil outlet valve fastening seat B, an oil outlet valve spring B, an oil outlet valve seat B, an oil outlet valve B, a methanol plunger sleeve, a methanol plunger, a plunger spring B, a lower plunger spring seat B, an oil supply timing adjusting screw B, an oil supply timing screw locking nut B and a tappet B, wherein the methanol plunger sleeve is arranged in the cavity B; the outlet valve B is connected at the top of the methanol plunger, the outlet valve B is installed on the outlet valve seat B, the upper part of the outlet valve seat B is provided with an outlet valve tight seat B, the connecting position of the outlet valve seat B and the outlet valve tight seat B is provided with a sealing gasket B, the cavity inside the outlet valve tight seat B is provided with an outlet valve spring B, the bottom of the outlet valve spring B is arranged on the outlet valve B, the top of the outlet valve spring B supports the inside of the outlet valve tight seat B, and the top of the outlet valve tight seat B is provided with a methanol fuel oil outlet.

Furthermore, an annular wedge-shaped groove is formed in the inner wall of the methanol plunger sleeve, the diameter of the annular wedge-shaped groove is large when the annular wedge-shaped groove is close to the top of the methanol plunger, and the diameter of the annular wedge-shaped groove is small when the annular wedge-shaped groove is far away from the top of the methanol plunger.

Further, be provided with the compulsory lubricating oil hole on the injection pump lid, be provided with self-lubricating pipe joint in the compulsory lubricating oil hole, self-lubricating pipe joint passes through lock nut fastening, and self-lubricating pipe joint is inside to pass the cavity intercommunication between methyl alcohol plunger bushing and the methyl alcohol plunger.

Further, the oil pump part of the diesel engine comprises a sealing washer A, an oil outlet valve fastening seat A, an oil outlet valve spring A, an oil outlet valve seat A, an oil outlet valve A, a diesel plunger sleeve, a diesel plunger, a plunger spring A, a lower plunger spring seat A, an oil supply timing adjusting screw A, an oil supply timing screw locking nut A and a tappet A, wherein the diesel plunger sleeve is arranged in the cavity A; the oil outlet valve A is connected at the top of the diesel oil plunger, the oil outlet valve A is installed on the oil outlet valve seat A, the oil outlet valve seat A upper portion is provided with the oil outlet valve tight seat A, the oil outlet valve seat A and the oil outlet valve tight seat A are connected at the position to be provided with the sealing gasket A, the cavity inside the oil outlet valve tight seat A is provided with the oil outlet valve spring A, the bottom of the oil outlet valve spring A is arranged on the oil outlet valve A, the top of the oil outlet valve spring A supports the inside of the oil outlet valve tight seat A, and the top of the oil outlet valve tight seat A.

A methanol-diesel oil dual injection engine fuel injection pump comprises a diesel oil fuel rail, a forced lubrication control valve, a methanol fuel rail, a methanol oil injector, a diesel oil fuel tank, a methanol fuel tank and a fuel injection pump assembly, wherein a diesel oil fuel outlet of a diesel oil pump oil part of the fuel injection pump assembly is communicated with an oil inlet of the diesel oil fuel rail, an oil return port of the diesel oil fuel rail is communicated with the diesel oil fuel tank, and the diesel oil fuel tank is connected with a diesel oil fuel inlet of the diesel oil pump oil part; the annular wedge-shaped groove, the methanol fuel oil outlet and the methanol fuel oil inlet of a methanol plunger in the oil part of the methanol pump of the fuel injection pump are respectively communicated with the oil outlet of a forced lubrication control valve, the oil inlet of a methanol fuel oil rail and a methanol fuel tank, the oil inlet of the forced lubrication control valve is communicated with the oil outlet of a diesel fuel oil rail, and the oil return port of the methanol fuel oil rail is communicated with the methanol fuel tank.

Furthermore, an oil inlet on the forced lubrication control valve is close to the lower end cover, an oil return opening is close to the upper end cover, a pressure balance oil duct is further arranged on the forced lubrication control valve, the pressure balance oil duct is a small hole parallel to the plunger cavity and is located right below the oil outlet duct, the upper end of the pressure balance oil duct is communicated with the oil outlet duct, and the lower end of the pressure balance oil duct is communicated with the cavity at the bottom of the plunger.

Furthermore, an oil inlet on the forced lubrication control valve is close to the lower end cover, and an oil return opening is close to the upper end cover, namely, the oil return opening is positioned above the oil inlet. The pressure balance oil duct on the forced lubrication control valve is a small hole parallel to the plunger cavity and is positioned right below the oil outlet duct, the upper end of the pressure balance oil duct is communicated with the oil outlet duct, and the lower end of the pressure balance oil duct is communicated with the plunger bottom cavity.

Compared with the prior art, the invention has the following beneficial effects:

1. the forced lubrication adopts diesel oil as lubricating oil, and the fuel injection pump can pump the diesel oil and the methanol simultaneously, so that a separate design mechanism is not needed for pressurizing the diesel oil, and the energy can be fully utilized.

2. Because the forced lubrication adopts diesel oil as lubricating oil, diesel oil power lubrication is formed at the annular wedge-shaped groove of the methanol plunger matching part, the pressure of the diesel oil in the forced lubrication is slightly greater than the oil injection pressure of the methanol, when the methanol plunger matching part compresses the methanol, the methanol cannot leak out along the gap of the plunger matching part to break the liquid sealing ring of the diesel oil downwards, a small amount of diesel oil possibly leaks into the methanol plunger matching part to mix the methanol, and the engine is originally methanol/diesel oil dual-fuel, so that the diesel oil leakage upwards and downwards almost has no influence on the operation of the engine.

3. When the methanol plunger piston moves downwards at a high speed relative to the methanol plunger sleeve, because the section of the annular wedge-shaped groove is wide at the top and narrow at the bottom, diesel oil power lubrication is formed at the methanol plunger and barrel assembly, a pressure oil film is established, and the plunger and barrel assembly can be prevented from being corroded by methanol.

4. The forced lubrication control valve can control the pressure of the forced lubrication diesel oil and can prevent the diesel oil at the lubrication position from flowing back to a diesel oil fuel rail and a diesel oil fuel tank due to the pressure.

Drawings

FIG. 1 is a schematic diagram of a fuel injection system of a methanol/diesel dual-fuel engine according to the present invention;

FIG. 2 is a schematic structural view of a main portion of the fuel injection pump of the present invention;

FIG. 3 is a schematic diagram of the methanol plunger and barrel assembly of FIG. 2 taken at section B-B;

FIG. 4 is a schematic view of the annular wedge groove at the methanol plunger assembly at C of FIG. 3, enlarged in part;

FIG. 5 is a schematic view of a forced lubrication control valve;

in the figure: 1-a diesel fuel rail, 2-a forced lubrication control valve, 3-a methanol fuel rail, 4-a methanol injector, 5-a diesel injector, 6-a diesel fuel tank, 7-a methanol fuel tank, 8-a fuel injection pump overall, 9-a fuel injection pump camshaft, 10-a methanol pump oil portion, 11-a diesel pump oil portion, 12-a tappet a, 13-a fuel feeding timing screw locking nut a, 14-a fuel feeding timing adjusting screw a, 15-a lower plunger spring seat a, 16-a plunger spring a, 17-a diesel plunger a, 18-a fuel injection pump body, 19-a diesel plunger sleeve, 20-a sealing washer a, 21-a fuel outlet valve seat a, 22-a fuel outlet valve a, 23-a fuel injection pump cover, 24-a fuel outlet valve seat a, 25-a fuel outlet valve spring a, 26-a fuel outlet valve spring B, 27-a fuel outlet valve seat B, 28-a fuel outlet valve B, 29-a fuel outlet valve seat B, 30-B, 31-a methanol plunger, 32-methanol plunger sleeve, 33-plunger spring B, 34-lower plunger spring seat B, 35-oil supply timing adjusting screw B, 36-oil supply timing screw locking nut B, 37-tappet B, 38-locking nut, 39-self-lubricating pipe joint, 40-valve core spring, 41-valve core, 42-sealing ring I, 43-upper end cover, 44-spring seat, 45-adjusting screw, 46-sealing ring II, 47-plunger spring, 48-plunger, 49-valve body, 50-lower end cover, 51-valve body joint, A1-diesel fuel inlet, A2-diesel fuel outlet, A3-methanol fuel outlet, A4-methanol fuel inlet, A5-wedge-shaped groove, A6-forced lubricating oil hole, A7-oil return port, A8-oil inlet, A9-pressure balance oil passage, A10-oil outlet passage, A11-oil outlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below, it is obvious that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 5, an embodiment of the invention provides a methanol/diesel dual-fuel engine fuel injection pump, which includes a fuel injection pump body 12, a diesel pump oil portion 11, a methanol pump oil portion 10, and a forced lubrication control valve 2. The fuel injection pump body 12.

A diesel fuel oil inlet A1 and a methanol fuel oil inlet A4 are machined; an annular wedge-shaped groove A5 is processed on the inner wall of the methanol plunger sleeve 32 in the methanol pump oil part 10; the forced lubrication control valve 2 is provided with a lubricating diesel direction control valve core 41 and a pressure reducing plunger 48. The valve core 41 determines the opening oil pressure of the valve core 41 by matching with the valve core spring 40 and the valve body joint 51; the plunger 48 reduces the oil pressure at the oil outlet passage a10 by the plunger spring 47, the adjusting screw 45, and the clearance inside the valve body 49.

Specifically, as shown in fig. 1-2, an injection pump assembly includes an injection pump body 18 and an injection pump cover 23, the injection pump cover 23 is installed on the injection pump body 18, a cavity a and a cavity B are formed inside the injection pump cover 23 and the injection pump body 18, a methanol pump oil portion 10 and a diesel pump oil portion 11 are respectively provided in the cavity a and the cavity B, a diesel fuel oil inlet a1 and a methanol fuel oil inlet a4 are respectively provided on two sides of the injection pump cover 23, the diesel fuel oil inlet a1 is communicated with the cavity a in which the diesel pump oil portion 11 is placed, the methanol fuel oil inlet a4 is communicated with the cavity B in which the methanol pump oil portion 10 is placed, and the bottoms of the diesel pump oil portion 11 and the methanol pump oil portion 10 are installed on an injection pump camshaft 9.

The left side of the oil injection pump body 18 is of a pump diesel fuel structure, the diesel pump oil part 11 comprises a sealing washer A20, an oil outlet valve fastening seat A24, an oil outlet valve spring A26, an oil outlet valve seat A21, an oil outlet valve A22, a diesel plunger sleeve 19, a diesel plunger 17, a plunger spring A16, a lower plunger spring seat A15, an oil supply timing adjusting screw A14, an oil supply timing screw locking nut A13 and a tappet A12, the diesel plunger sleeve 19 is arranged in a cavity A, the diesel plunger 17 is arranged in the diesel plunger sleeve 19, a plunger cavity formed by the diesel plunger sleeve 19 and the diesel plunger 17 is communicated with a diesel fuel oil inlet A1, the bottom of the diesel plunger 17 is connected with a lower plunger spring seat A15, the lower part of the lower plunger spring seat A15 is connected with an oil supply timing adjusting screw A14, the lower part of the oil supply timing adjusting screw A14 is sequentially screwed into the oil supply timing screw locking nut A13 and the tappet A12, and; the top of diesel oil plunger 17 is connected oil valve A22, oil valve A22 is installed on oil valve seat A21, oil valve seat A21 upper portion sets up tight seat A24 of oil outlet valve, oil valve seat A21 sets up sealing washer A20 with tight seat A24 hookup location of oil outlet valve, the inside cavity of tight seat A24 of oil outlet valve sets up oil valve spring A25, oil valve spring A25 bottom sets up on oil valve A22, oil valve spring A25 top supports the inside of tight seat A24 of oil outlet valve, tight seat A24 top of oil outlet valve is provided with methanol fuel oil-out A3.

The low-pressure diesel fuel is sucked into a plunger cavity formed by the diesel plunger sleeve 19 and the diesel plunger 17 from a diesel fuel oil inlet A1, the camshaft 9 of the fuel injection pump rotates to jack the tappet A12 to move upwards to drive the oil supply timing adjusting screw A14 which is in threaded connection with the tappet A12 to push the diesel plunger 17 to move upwards to compress the diesel fuel, the higher diesel pressure overcomes the elastic force of the oil outlet valve spring A25 to push the oil outlet valve A22 to enable the oil outlet valve A22 and the oil outlet valve seat A21 to form a gap, so that the diesel fuel flows to a diesel fuel oil outlet A2 of the oil outlet valve fastening seat A24 along the gap, and the high-pressure diesel fuel enters the diesel fuel rail 1 along an oil pipe. When the pressure of diesel fuel in the diesel plunger cavity is not enough to overcome the elastic force of the oil outlet valve spring A25, the oil outlet valve A22 falls down to stop pumping oil; when the diesel plunger 17 moves to the highest point, the lower plunger spring seat A15 is pushed to move downwards by the elasticity of the plunger spring A16, so that the diesel plunger 17 is driven to move downwards. The process is alternately repeated, so that oil is continuously pumped into the diesel fuel rail 1, and the frequency of the oil pumping changes along with the change of the rotating speed of the camshaft 9 of the oil injection pump.

Specifically, as shown in fig. 1-2, the right side of the fuel injection pump body 18 is a pump methanol fuel structure. The methanol pump oil part 10 comprises a sealing gasket B30, an oil outlet valve fastening seat B27, an oil outlet valve spring B26, an oil outlet valve seat B29, an oil outlet valve B28, a methanol plunger sleeve 32, a methanol plunger 31, a plunger spring B33, a lower plunger spring seat B34, an oil supply timing adjusting screw B35, an oil supply timing screw locking nut B36 and a tappet B37, wherein the methanol plunger sleeve 32 is arranged in a cavity B, the methanol plunger 31 is arranged in the methanol plunger sleeve 32, a plunger cavity formed by the methanol plunger sleeve 32 and the methanol plunger 31 is communicated with a methanol fuel oil inlet A4, the bottom of the methanol plunger 31 is connected with the lower plunger spring seat B34, the lower part of the lower plunger spring seat B34 is connected with the oil supply timing adjusting screw B35, the lower part of the oil supply timing adjusting screw B35 is sequentially screwed into the oil supply timing screw locking nut B36 and the tappet B37, and the bottom of the tappet B37 is connected with; oil valve B28 is connected at methyl alcohol plunger 31 top, oil valve B28 is installed on oil valve seat B29, the tight seat B27 of oil valve is set up on oil valve seat B29 upper portion, oil valve seat B29 sets up sealing washer B30 with the tight seat B27 hookup location of oil valve, the inside cavity of the tight seat B27 of oil valve sets up oil valve spring B26, oil valve spring B26 bottom sets up on oil valve B28, the inside of the tight seat B27 of oil valve is supported at oil valve spring B26 top, the tight seat B27 top of oil valve is provided with methyl alcohol fuel oil-out port A3. An annular wedge-shaped groove A5 is formed in the inner wall of the methanol plunger sleeve 32, the diameter of the annular wedge-shaped groove A5 is large when the annular wedge-shaped groove is close to the top of the methanol plunger 31, and the diameter of the annular wedge-shaped groove A5 is small when the annular wedge-shaped groove is far away from the top of the methanol plunger 31. The oil spraying pump cover 23 is provided with a forced lubricating oil hole A6, a self-lubricating pipe joint 39 is arranged in the forced lubricating oil hole A6, the self-lubricating pipe joint 39 is fastened through a locking nut 38, and the self-lubricating pipe joint 39 penetrates through a cavity between the methanol plunger sleeve 32 and the methanol plunger 31.

The low-pressure methanol fuel is sucked into a plunger cavity formed by the methanol plunger sleeve 32 and the methanol plunger 31 from a methanol fuel inlet A4, the camshaft 9 of the fuel injection pump rotates to jack the tappet B37 to move upwards to drive the fuel supply timing adjusting screw B35 which is in threaded connection with the tappet B37 to push the methanol plunger 31 to move upwards to compress the diesel fuel, the higher diesel pressure overcomes the elastic force of the fuel outlet valve spring B26 to push the fuel outlet valve B28 to enable the fuel outlet valve B28 and the fuel outlet valve seat B29 to form a gap, so that the methanol fuel flows to a methanol fuel outlet A3 of the fuel outlet valve seat B27 along the gap, and the high-pressure methanol fuel enters the methanol fuel rail 3 along the fuel pipe. When the pressure of the methanol fuel in the methanol plunger cavity is not enough to overcome the elastic force of the oil outlet valve spring B26, the oil outlet valve B28 falls down to stop pumping oil; when the methanol plunger 31 moves to the highest point, the lower plunger spring seat B34 is pushed to move downwards by the elasticity of the plunger spring B33, so that the methanol plunger 31 is driven to move downwards. The process is alternately repeated, so that oil is continuously pumped into the methanol fuel oil rail 3, and the frequency of the oil pumping changes along with the change of the rotating speed of the camshaft 9 of the oil injection pump.

Specifically, as shown in fig. 5, high-pressure diesel oil from the diesel fuel rail 1 enters the forced lubrication control valve 2 through the oil inlet A8, flows down to the oil outlet passage a10 along the pressure balance oil passage a9 along the gap between the plunger 48 and the inner hole of the valve body 49, and enters the bottom end of the plunger 48, at this time, the plunger 48 will move upward due to the fact that the diesel oil pressure in the oil outlet passage a10 is too high, and at this time, the opening between the plunger 48 and the valve body 49 will become small, until the hydraulic pressure on the plunger 48 is balanced with the spring force of the plunger spring 47, at this time, the diesel oil pressure in the oil outlet passage a10 is substantially maintained at the setting value we need. The adjustment is adjusted by adjusting the adjustment screw 45. When the pressure of the diesel oil at the oil outlet passage a10 overcomes the spring force of the valve core spring 48 acting on the valve core 41 and the hydraulic pressure of the diesel oil at the oil outlet port a11 acting on the valve core 41 (which is not present when the fuel injection pump is operated for the first time), the valve core 41 is pushed to move leftward, so that the diesel oil at the oil outlet passage a10 flows out from the oil outlet port a11 through the oil holes in the valve core 41. When the pressure of diesel oil at oil outlet channel a11 is not sufficient to overcome the spring force of valve spool spring 40 acting on valve spool 41 and the hydraulic pressure of diesel oil at oil outlet port a11 acting on valve spool 41, diesel oil (which may contain a small amount of methanol) from oil outlet port a11 does not flow back through valve spool 41 to contaminate the diesel fuel. During operation of the plunger 48, a small amount of diesel oil may leak upward through the clearance between the plunger 48 and the valve body 49 and may flow back to the diesel fuel tank 6 through the return opening a 7.

Wherein, the oil outlet A11 is connected with the right end of the forced lubrication threaded pipe, and the oil inlet A8 is connected with the diesel fuel oil rail 1.

Specifically, as shown in fig. 3 to 4, diesel oil from an oil outlet a11 enters an annular wedge-shaped groove a5 on the methanol plunger sleeve 32 through a forced lubricating oil hole a6 in a self-lubricating pipe joint 39, and an effective pressure oil film is established at the annular wedge-shaped groove a5 on the methanol plunger sleeve 32 by means of the high-speed movement of the methanol plunger 31 to isolate the corrosion of methanol to a methanol plunger matching part; the diesel oil at the annular wedge-shaped groove A5 has certain pressure, so that the methanol fuel in the methanol plunger cavity can be isolated from leaking downwards to the camshaft box of the injection pump to dilute the lubricating oil.

The working process of the invention is as follows: when the engine runs, a crankshaft of the engine drives the oil injection pump camshaft 9 to rotate through gear transmission, the cam on the oil injection pump camshaft 9 jacks up and down reciprocating motion of the diesel oil plunger 17 and the methanol plunger 31 respectively, so that diesel oil is pumped into the diesel oil fuel rail 1, methanol fuel is pumped into the methanol fuel rail 3, meanwhile, high-pressure diesel oil in the diesel oil fuel rail 1 enters the oil inlet A8 through the oil pipe and passes through the pressure reduction of the forced lubrication control valve 2 and the effect of fixing the flow direction of the diesel oil, diesel oil with a set value is obtained at the oil outlet A11, the diesel oil is conveyed into a forced lubrication oil hole A6 in the self-lubrication pipe joint 39 through the oil pipe, and finally enters the annular wedge-shaped groove A5 on the methanol plunger sleeve 32 to perform forced self-lubrication on a methanol plunger. Since the fuel injection pump is used for a dual-fuel engine with diesel fuel for igniting methanol for combustion, the diesel fuel is injected earlier than the methanol when the engine is running, namely the diesel fuel plunger 17 has a motion advance angle relative to the methanol plunger 31, so that the diesel fuel which is forcibly lubricated reaches the annular wedge-shaped groove A5 on the methanol plunger sleeve 32 when the methanol plunger 31 works.

Finally, it should be noted that: the foregoing is a more detailed description of the invention, taken in conjunction with specific preferred embodiments thereof, and is not intended to limit the invention solely to these descriptions; while the invention has been described in detail and with reference to the foregoing embodiments, those skilled in the art will appreciate that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equally exchanged; and the modified rings are replaced by other modified rings, so that the essence of the corresponding technical scheme does not depart from the technical scheme of each embodiment of the invention.