Marine engine fuel injection valve

Abstract

The present invention discloses a fuel injection valve for a marine engine, comprising a valve body, a lift limit screw, a spring, and a valve stem; the valve body is provided with a fuel inlet, a fuel chamber, and a spray hole that are connected in sequence; the valve stem is slidably arranged inside the valve body; the spring is arranged inside the valve housing, and the spring causes the valve stem to have a tendency to slide rightward, causing the right portion of the valve stem to block the spray hole, thereby disconnecting the fuel chamber from the spray hole; the valve body is further provided with a control oil circuit, and by introducing control oil into the control oil circuit, the valve stem can overcome the elastic force of the spring and move leftward, thereby connecting the fuel chamber to the spray hole; the lift limit screw is arranged on the left side of the valve stem in a manner that can adjust its position in the left and right directions. The present invention can change the injection amount of fuel and can meet the different injection amount requirements of different fuels.

Description

Technical Field

[0001] The invention relates to a fuel injection system for a ship dual-fuel engine, and in particular to a fuel injection valve for a ship engine. Background Art

[0002] As domestic and international emission regulations become increasingly stringent, new regulations define extremely strict limits for NOx, SOx, and particulate matter in exhaust gases. With the market's strong pursuit of clean power, the marine engine industry is vigorously developing multi-fuel engine technologies, allowing for the selection of gaseous (e.g., natural gas) or liquid (e.g., diesel or methanol) fuels. To achieve greater fuel flexibility, improvements to fuel injection valves are necessary. Due to the varying calorific values of various fuels, the flow rate range for fuel injection needs to be increased severalfold. Therefore, a marine engine fuel injection valve with a wide flow adjustment range is required to achieve multi-fuel compatibility.

[0003] CN203130313U discloses a dual fuel injection valve for diesel engines and gas engines with a pumping function nozzle, comprising: a fuel valve block, which has a flow path formed inside for injecting the same or different fuels for the first and second times through a high-pressure pipe; a cylinder needle valve, which rises with the pressure difference of the second fuel injected through the flow path formed in the fuel valve block and injects the first fuel through the pilot nozzle; a main needle valve, which pressurizes the cylinder needle valve to inject the first fuel, and then rises with the pressure difference of the second fuel flowing in through the connected flow path, thereby injecting the first fuel through the main nozzle. Undoubtedly, the technical solution disclosed in the above patent document is a beneficial attempt in the relevant technical field. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a ship engine fuel injection valve that can change the injection amount of fuel, can meet the different requirements of different fuels for injection amount, can be applicable to various types of fuels such as natural gas, diesel, methanol, etc., can meet the different requirements of different fuels for injection amount, and can be used for both gas and liquid.

[0005] A marine engine fuel injection valve in the present invention comprises a valve body, a lift limit screw, a spring and a valve stem;

[0006] The valve body is provided with a fuel inlet, a fuel cavity and a spray hole which are connected in sequence;

[0007] The valve stem is slidably arranged inside the valve body;

[0008] The spring is arranged inside the valve body, and the spring causes the valve stem to have a tendency to slide rightward, so that the right part of the valve stem blocks the spray hole, so that the fuel chamber is not connected to the spray hole;

[0009] The valve body is further provided with a control oil circuit, and by introducing control oil into the control oil circuit, the valve stem can be moved leftward against the elastic force of the spring, so that the fuel chamber is connected to the spray hole;

[0010] The lift limit screw is arranged on the left side of the valve stem in a manner that the position can be adjusted along the left and right directions, and there is a lift gap between the right end of the lift limit screw and the left end of the valve stem. By changing the position of the lift limit screw, the communication area when the fuel chamber and the nozzle are connected can be changed.

[0011] Furthermore, the spray hole is in the shape of a water droplet with a larger left side and a smaller right side.

[0012] Furthermore, the penetration direction of the spray hole is along the radial direction of the valve stem.

[0013] Furthermore, the valve body includes a main shell, a guide sleeve and a nozzle connected in sequence from left to right; the interior of the main shell is provided with a central hole that passes through in the left and right directions, the central hole includes a threaded section and an installation section arranged on the right side of the threaded section, the lift limit screw is connected to the threaded section, and the right part of the lift limit screw and the spring are both located in the installation section.

[0014] Furthermore, the valve stem is slidably arranged inside the guide sleeve; a control oil chamber is provided in the guide sleeve, and the valve stem includes a hydraulic control section, a first blocking section, a connecting section and a second blocking section arranged in sequence from left to right; the hydraulic control section is arranged in the control oil chamber, the left end of the hydraulic control section abuts against the right end of the spring, and the oil outlet of the control oil circuit faces the right end of the hydraulic control section.

[0015] Furthermore, the fuel chamber includes a first fuel chamber arranged in the guide sleeve and a second fuel chamber arranged in the nozzle; the left part of the first blocking section is slidably connected to the guide sleeve in a slidable manner, and the right part of the first blocking section is located in the first fuel chamber; when the fuel chamber is not connected to the nozzle hole, the right end of the first blocking section abuts against the right end of the first fuel chamber to prevent the first fuel chamber from being connected to the second fuel chamber; when the fuel chamber is connected to the nozzle hole, the right end of the first blocking section is separated from the right end of the first fuel chamber to connect the first fuel chamber to the second fuel chamber.

[0016] Furthermore, the outer diameter of the connecting section is smaller than the outer diameter of the first sealing section and the inner diameter of the second fuel cavity. A fuel through-hole and a fuel through-hole are provided inside the second sealing section. The left end of the fuel through-hole is connected to the second fuel cavity outside the connecting section through the fuel through-hole, and the right end of the fuel through-hole is provided with an opening; the outer wall of the second sealing section is in contact with the inner wall of the second fuel cavity, and the outer wall of the second sealing section can be used to seal the spray hole; when the valve stem is moved to the left by introducing control oil into the control oil circuit, the outer wall of the second sealing section exposes the spray hole, and the fuel inlet, the first fuel cavity, the second fuel cavity outside the connecting section, the fuel through-hole, the fuel through-hole, the second fuel cavity on the right side of the second sealing section, and the spray hole are connected in sequence.

[0017] Furthermore, the left end of the lift limiting screw extends out of the main housing, and a rotation force application groove is provided on the left end of the lift limiting screw.

[0018] Furthermore, a locking nut is included. The outside of the left end of the lift limiting screw is provided with an external thread, and the locking nut is connected to the left end of the lift limiting screw.

[0019] Furthermore, a sealing oil circuit is provided in the valve body, and an oil outlet of the sealing oil circuit leads to the gap between the guide sleeve and the first blocking section.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention is applicable to various types of fuels such as natural gas, diesel, methanol, etc., and can meet the different requirements of different fuels for injection volume. It can be used for both gas and liquid;

[0022] 2. By changing the position of the lift limit screw, the present invention can change the communication area between the fuel chamber and the spray hole. At the same time, the timing of fuel injection can be changed by changing the time when the control oil is introduced into the control oil circuit. By changing the injection time and the communication area, the fuel injection amount can be changed, which can meet the different injection amount requirements of different fuels.

[0023] 3. The valve stem of the present invention can block the spray hole. At the same time, the right end of the first blocking section abuts against the right end of the first fuel chamber, so that the first fuel chamber and the second fuel chamber are not connected, forming a double blockage, further ensuring that there will be no leakage when fuel injection is not required.

[0024] 4. The present invention has a long service life and the position adjustment of the lift limit screw is precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 for Figure 1 AA cross-section diagram;

[0028] Figure 3 Schematic diagram of the structure of the nozzle of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the valve body of the present invention;

[0030] Figure 5 This is a comparison diagram of the valve stem opening positions for liquid and gas according to the present invention (the ship engine fuel injection valve on the upper side is for liquid, and the ship engine fuel injection valve on the lower side is for gas).

[0031] The following are marked in the accompanying drawings:

[0032] 1-valve body, 11-fuel inlet, 12-fuel chamber, 121-first fuel chamber, 122-second fuel chamber, 13-spray hole, 14-control oil circuit, 15-main housing, 152-mounting section, 16-guide sleeve, 161-control oil chamber, 17-nozzle, 18-sealing oil circuit;

[0033] 2-lift limit screw, 21-rotation force groove;

[0034] 3- Spring;

[0035] 4-valve stem, 41-hydraulic control section, 42-first blocking section, 43-connecting section, 44-second blocking section, 441-fuel through hole, 442-fuel through cavity;

[0036] 5- Lock nut. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0038] like Figure 1-Figure 5 As shown, a fuel injection valve for a marine engine in this embodiment includes a valve body 1, a lift limit screw 2, a spring 3 and a valve stem 4;

[0039] The valve body 1 is provided with a fuel inlet 11, a fuel cavity 12 and a spray hole 13 which are connected in sequence;

[0040] The valve stem 4 is slidably arranged inside the valve body 1;

[0041] The spring 3 is disposed inside the valve body 1 , and the spring 3 causes the valve stem 4 to slide rightward, so that the right portion of the valve stem 4 blocks the spray hole 13 , thereby preventing the fuel chamber 12 from communicating with the spray hole 13 .

[0042] The valve body 1 is further provided with a control oil passage 14. By introducing control oil into the control oil passage 14, the valve stem 4 can overcome the elastic force of the spring 3 and move leftward, thereby connecting the fuel chamber 12 with the spray hole 13.

[0043] The lift limit screw 2 is arranged on the left side of the valve stem 4 in a manner that the position can be adjusted along the left and right directions, and there is a lift gap between the right end of the lift limit screw 2 and the left end of the valve stem 4. By changing the position of the lift limit screw 2, the communication area when the fuel chamber 12 and the nozzle hole 13 are connected can be changed.

[0044] The marine engine fuel injection valve of this embodiment can be applied to a variety of fuel types such as natural gas, diesel, methanol, etc., and can meet the different requirements of different fuels for injection quantity. It can be used for both gas and liquid. When the marine engine fuel injection valve is applied to an engine using natural gas as fuel, the position of the lift limit screw 2 satisfies the following conditions: when the left end of the valve stem 4 abuts against the right end of the lift limit screw 2, the valve stem 4 does not block the spray hole 13, that is, the spray hole 13 is completely exposed. Figure 5 When the ship engine fuel injection valve is used in an engine using diesel as fuel, the position of the lift limit screw 2 satisfies the following conditions: when the left end of the valve stem 4 abuts against the right end of the lift limit screw 2, the area blocked by the valve stem 4 accounts for two-thirds of the total area of the spray hole 13, that is, one-third of the spray hole 13 is exposed, as shown in FIG. Figure 5 As shown in the upper side of the ship engine fuel injection valve; when the ship engine fuel injection valve is applied to an engine using methanol as fuel, the position of the lift limit screw 2 satisfies: when the left end of the valve stem 4 abuts against the right end of the lift limit screw 2, the area blocked by the valve stem 4 accounts for half of the total area of the spray hole 13, that is, half of the spray hole 13 is exposed.

[0045] When no control oil is introduced into the control oil circuit 14, the control oil causes the valve stem 4 to move to the left, and the spring 3 is compressed until the left end of the valve stem 4 abuts against the right end of the lift limit screw 2. The valve stem 4 stops moving, so that the fuel chamber 12 is connected to the spray hole 13, so that fuel can be sprayed into the cylinder through the spray hole 13; after the injection is completed, the control oil is stopped from being introduced into the control oil circuit 14. At this time, the spring 3 recovers its shape, and the spring 3 drives the valve stem 4 to move to the right, so that the valve stem 4 blocks the spray hole 13 again, thereby stopping the oil supply. Among them, the lift clearance is the allowable displacement of the valve stem 4 to the left when injecting fuel. Therefore, the position of the lift limit screw 2 determines the position of the valve stem 4 when injecting fuel, and this position determines the communication area when the fuel chamber 12 and the spray hole 13 are connected. Therefore, by changing the position of the lift limit screw 2, the communication area when the fuel chamber 12 and the spray hole 13 are connected can be changed. At the same time, the time of fuel injection can be changed by changing the time when the control oil is introduced into the control oil circuit 14. By changing the injection time and the communication area, the injection amount of fuel can be changed, which can meet the different requirements of different fuels for the injection amount.

[0046] In this embodiment, the spray hole 13 is in the shape of a water droplet with a larger left side and a smaller right side. The water droplet shape includes a semicircle and a pointed cone on the right side of the semicircle. The pointed cone gradually appears from left to right, and the valve stem 4 also moves in the left and right directions. This water droplet shape makes the spray hole 13 longer in the left and right directions, so that the valve stem 4 can have more position options when blocking the spray hole 13, so that the connecting area has more rotation and adjustment is more convenient.

[0047] In this embodiment, the spray hole 13 extends in a radial direction of the valve stem 4. The axis of the valve stem 4 extends in the left-right direction. By moving the valve stem 4 in the left-right direction, the valve stem 4 can block or expose the spray hole 13. A plurality of spray holes 13, for example, two, can be provided at equal intervals along the circumference. The equal intervals of the spray holes 13 along the circumference can balance the pressure in all directions on the valve stem 4, avoid friction between the valve stem 4 and the nozzle 17, and increase the service life of the valve stem 4 and the nozzle 17.

[0048] In this embodiment, the valve body 1 includes a main housing 15, a guide sleeve 16, and a nozzle 17, which are connected in sequence from left to right. A central hole extending horizontally through the main housing 15 is provided within the main housing 15. The central hole includes a threaded section and a mounting section 152 disposed to the right of the threaded section. The lift-limiting screw 2 is connected to the threaded section, and the right portion of the lift-limiting screw 2 and the spring 3 are both located within the mounting section 152. The threaded section cooperates with the threads of the lift-limiting screw 2, and the lift-limiting screw 2 can be rotated to move the lift-limiting screw 2 left and right, thereby changing its position.

[0049] In this embodiment, the valve stem 4 is slidably disposed within the guide sleeve 16. A control oil chamber 161 is provided within the guide sleeve 16. The valve stem 4 includes, from left to right, a hydraulic control section 41, a first blocking section 42, a connecting section 43, and a second blocking section 44. The hydraulic control section 41 is disposed within the control oil chamber 161, with the left end of the hydraulic control section 41 abutting against the right end of the spring 3. The oil outlet of the control oil circuit 14 faces the right end of the hydraulic control section 41. When no control oil is introduced into the control oil circuit 14, control oil enters the control oil chamber 161 at the right end of the hydraulic control section 41, pushing the hydraulic control section 41 leftward, thereby causing the valve stem 4 to move leftward as a whole. After injection is completed, the supply of control oil to the control oil circuit 14 is stopped, and the spring 3 returns to its original shape, pushing the hydraulic control section 41 rightward, thereby causing the valve stem 4 to move rightward as a whole. At this point, the control oil flows from the control oil chamber 161 back into the control oil circuit 14.

[0050] In this embodiment, the fuel chamber 12 includes a first fuel chamber 121 arranged in the guide sleeve 16 and a second fuel chamber 122 arranged in the nozzle 17; the left part of the first sealing section 42 is slidably connected to the guide sleeve 16 in a slidable manner, and the right part of the first sealing section 42 is located in the first fuel chamber 121; when the fuel chamber 12 is not connected to the nozzle hole 13, the right end of the first sealing section 42 abuts against the right end of the first fuel chamber 121, so that the first fuel chamber 121 and the second fuel chamber 122 are not connected; when the fuel chamber 12 is connected to the nozzle hole 13, the right end of the first sealing section 42 is separated from the right end of the first fuel chamber 121, so that the first fuel chamber 121 and the second fuel chamber 122 are connected. After the injection is completed, the control oil is stopped from flowing into the control oil passage 14. At this time, the spring 3 recovers its shape, and the spring 3 drives the valve stem 4 to move rightward, so that the valve stem 4 blocks the spray hole 13 again. At the same time, the right end of the first blocking section 42 abuts against the right end of the first fuel chamber 121, so that the first fuel chamber 121 is not connected with the second fuel chamber 122, forming a Figure 2 The two seals shown further ensure that no leakage occurs when fuel injection is not required.

[0051] In this embodiment, the outer diameter of the connecting section 43 is smaller than the outer diameter of the first blocking section 42 and the inner diameter of the second fuel cavity 122. The interior of the second blocking section 44 is provided with a fuel through hole 441 and a fuel through cavity 442. The left end of the fuel through cavity 442 is connected to the second fuel cavity 122 located outside the connecting section 43 through the fuel through hole 441, and the right end of the fuel through cavity 442 is provided with an opening; the outer wall of the second blocking section 44 is connected to the inner wall of the second fuel cavity 122. The outer wall of the second sealing section 44 can be used to seal the spray hole 13; when the valve stem 4 is moved to the left by introducing control oil into the control oil circuit 14, the outer wall of the second sealing section 44 exposes the spray hole 13, and the fuel inlet 11, the first fuel cavity 121, the second fuel cavity 122 outside the connecting section 43, the fuel through hole 441, the fuel through cavity 442, the second fuel cavity 122 on the right side of the second sealing section 44 and the spray hole 13 are connected in sequence.

[0052] In this embodiment, the left end of the lift limit screw 2 extends out of the main housing 15, and a rotation force application groove 21 is provided on the left end of the lift limit screw 2. In this embodiment, a locking nut 5 is also included, and the exterior of the left end of the lift limit screw 2 is provided with an external thread, and the locking nut 5 is connected to the left end of the lift limit screw 2. The rotation force application groove 21 is preferably a hexagonal groove. When adjusting, the locking nut 5 is first removed, and then a hexagonal wrench is inserted into the rotation force application groove 21 to adjust the position of the lift limit screw. After the adjustment is completed, the locking nut 5 is installed and screwed to a position close to the valve body 1 to prevent the position of the lift limit screw 2 from changing.

[0053] In this embodiment, a sealing oil passage 18 is further provided within the valve body 1. The oil outlet of the sealing oil passage 18 leads to the gap between the guide sleeve 16 and the first blocking section 42. Sealing oil is introduced into the sealing oil passage 18 from the outside, thereby introducing the sealing oil into the gap between the guide sleeve 16 and the first blocking section 42, thereby achieving sealing and lubrication, and preventing fuel leakage within the first fuel chamber 121.

[0054] In summary, before the marine engine fuel injection valve in this embodiment is assembled to the engine, the position of the lift limit screw 2 is first adjusted according to the fuel type of the engine. The selection of the position has been illustrated and will not be repeated here. After the marine engine fuel injection valve is assembled to the engine, when in use, when no control oil is introduced into the control oil circuit 14, the control oil causes the valve stem 4 to move to the left, and the spring 3 is compressed until the left end of the valve stem 4 abuts against the right end of the lift limit screw 2, and the valve stem 4 stops moving. At this time, the fuel passes through the fuel inlet 11, the first fuel chamber 121, the second fuel chamber located outside the connecting section 43 in sequence. cavity 122, the fuel through hole 441, the fuel through cavity 442, the second fuel cavity 122 located on the right side of the second blocking section 44 and the nozzle 13, and finally inject fuel into the cylinder; after the injection is completed, the control oil is stopped from entering the control oil circuit 14. At this time, the spring 3 restores its shape, and the spring 3 drives the valve stem 4 to move to the right, so that the valve stem 4 blocks the nozzle 13 again, thereby stopping the injection of fuel. At the same time, the right end of the first blocking section 42 abuts against the right end of the first fuel cavity 121, so that the first fuel cavity 121 and the second fuel cavity 122 are not connected, forming two blocks, further ensuring that no leakage occurs when fuel injection is not required.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fuel injection valve for a marine engine, comprising a valve body (1), characterized in that: It also includes a lift limit screw (2), a spring (3) and a valve stem (4); The valve body (1) is provided with a fuel inlet (11), a fuel cavity (12) and a spray hole (13) which are connected in sequence; The valve stem (4) is slidably arranged inside the valve body (1); The spring (3) is arranged inside the valve body (1), and the spring (3) causes the valve stem (4) to have a tendency to slide rightward, so that the right part of the valve stem (4) blocks the spray hole (13), so that the fuel chamber (12) and the spray hole (13) are not connected; A control oil circuit (14) is further provided in the valve body (1). By introducing control oil into the control oil circuit (14), the valve stem (4) can be moved to the left against the elastic force of the spring (3), thereby connecting the fuel chamber (12) with the spray hole (13). The lift limiting screw (2) is arranged on the left side of the valve stem (4) in a manner that allows the position to be adjusted in the left-right direction, and a lift gap is provided between the right end of the lift limiting screw (2) and the left end of the valve stem (4). By changing the position of the lift limiting screw (2), the communication area between the fuel chamber (12) and the spray hole (13) can be changed.

2. The marine engine fuel injection valve according to claim 1, characterized in that: The spray hole (13) is in the shape of a water droplet with a larger left side and a smaller right side.

3. The marine engine fuel injection valve according to claim 1, characterized in that: The penetration direction of the spray hole (13) is along the radial direction of the valve stem (4).

4. The marine engine fuel injection valve according to claim 1, characterized in that: The valve body (1) includes a main shell (15), a guide sleeve (16) and a nozzle (17) connected in sequence from left to right; a central hole is provided inside the main shell (15) and passes through in the left-right direction, the central hole includes a threaded section and a mounting section (152) provided on the right side of the threaded section, the lift limit screw (2) is connected to the threaded section, and the right part of the lift limit screw (2) and the spring (3) are both located in the mounting section (152).

5. The marine engine fuel injection valve according to claim 4, characterized in that: The valve stem (4) is slidably arranged inside the guide sleeve (16); a control oil chamber (161) is arranged inside the guide sleeve (16); the valve stem (4) comprises a hydraulic control section (41), a first blocking section (42), a connecting section (43), and a second blocking section (44) arranged in sequence from left to right; the hydraulic control section (41) is arranged in the control oil chamber (161), the left end of the hydraulic control section (41) abuts against the right end of the spring (3), and the oil outlet of the control oil circuit (14) faces the right end of the hydraulic control section (41).

6. The marine engine fuel injection valve according to claim 5, characterized in that: The fuel chamber (12) includes a first fuel chamber (121) arranged in the guide sleeve (16) and a second fuel chamber (122) arranged in the nozzle (17); the left portion of the first blocking section (42) is slidably connected to the guide sleeve (16), and the right portion of the first blocking section (42) is located in the first fuel chamber (121); when the fuel chamber (12) is not connected to the nozzle hole (13), the right end of the first blocking section (42) abuts against the right end of the first fuel chamber (121) so that the first fuel chamber (121) and the second fuel chamber (122) are not connected; when the fuel chamber (12) is connected to the nozzle hole (13), the right end of the first blocking section (42) is separated from the right end of the first fuel chamber (121) so that the first fuel chamber (121) and the second fuel chamber (122) are connected.

7. The marine engine fuel injection valve according to claim 6, characterized in that: The outer diameter of the connecting section (43) is smaller than the outer diameter of the first blocking section (42) and the inner diameter of the second fuel cavity (122); a fuel through hole (441) and a fuel through cavity (442) are provided inside the second blocking section (44); the left end of the fuel through cavity (442) is connected to the second fuel cavity (122) located outside the connecting section (43) through the fuel through hole (441); the right end of the fuel through cavity (442) is provided with an opening; the outer wall of the second blocking section (44) is in contact with the inner wall of the second fuel cavity (122); The outer wall of the second blocking section (44) can be used to block the spray hole (13); when the valve stem (4) moves to the left by introducing control oil into the control oil circuit (14), the outer wall of the second blocking section (44) exposes the spray hole (13), and the fuel inlet (11), the first fuel cavity (121), the second fuel cavity (122) located outside the connecting section (43), the fuel through hole (441), the fuel through cavity (442), the second fuel cavity (122) located on the right side of the second blocking section (44), and the spray hole (13) are connected in sequence.

8. The marine engine fuel injection valve according to claim 4, characterized in that: The left end of the lift-limiting screw (2) extends out of the main housing (15), and a rotation force application groove (21) is provided on the left end of the lift-limiting screw (2).

9. The marine engine fuel injection valve according to claim 8, characterized in that: It also includes a locking nut (5), the left end of the lift-limiting screw (2) is provided with an external thread on the outside, and the locking nut (5) is connected to the left end of the lift-limiting screw (2).

10. The marine engine fuel injection valve according to claim 5, characterized in that: A sealing oil circuit (18) is also provided in the valve body (1), and an oil outlet of the sealing oil circuit (18) leads to the gap between the guide sleeve (16) and the first blocking section (42).

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