Fuel oil control mechanism of marine medium-speed four-stroke diesel engine

Abstract

The utility model belongs to the field of marine diesel engines, and particularly relates to a fuel oil control mechanism of a marine medium-speed four-stroke diesel engine, which comprises an electromagnetic valve, an oil quantity control valve below the electromagnetic valve and an oil limiting rocker arm below the oil quantity control valve, and the electromagnetic valve is communicated with the oil quantity control valve through a gas circuit pipe. According to the fuel oil control mechanism, the ejector rod of the oil quantity control valve is controlled by the electromagnetic valve to abut against the oil limiting rocker arm below, the maximum oil supply quantity of the diesel engine can be controlled at the initial stage of starting of the diesel engine, and black smoke caused by incomplete combustion due to excessive oil supply quantity is prevented; moreover, the fuel oil control mechanism is simple in structure, strong in generality, low in failure rate, suitable for diesel engines of different specifications, simple in field debugging after being loaded on a ship, and capable of reducing burdens of workers.

Description

Technical Field

[0001] The utility model belongs to the field of marine diesel engines, in particular to a fuel control mechanism for a marine medium-speed four-stroke diesel engine. Background Art

[0002] When a marine diesel engine is started or the gearbox is engaged, the load suddenly increases and the speed changes rapidly. During this process, the fuel supply is large, the ratio of air and fuel is not appropriate, resulting in poor combustion and insufficient output power, causing a short-term overload and even black smoke. Utility Model Content

[0003] In view of the various deficiencies in the prior art, the inventor has designed a fuel control mechanism for a medium-speed four-stroke marine diesel engine through long-term practice. The maximum fuel supply of the diesel engine is controlled by an oil quantity control valve, which can effectively solve the problem of black smoke caused by incomplete combustion of the diesel engine.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A fuel control mechanism for a medium-speed four-stroke marine diesel engine comprises a solenoid valve, an oil quantity control valve below the solenoid valve and an oil limiting rocker arm below the oil quantity control valve. The solenoid valve and the oil quantity control valve are connected through an air line pipe.

[0006] The oil quantity control valve comprises a valve body and an end straight pipe joint fixed to the top of the valve body, and the gas line pipe passes through the central hole of the end straight pipe joint and communicates with the piston inside the oil quantity control valve. A blind cover is provided between the end straight pipe joint and the valve body. A cavity is provided inside the valve body, the piston is provided above the cavity, and a push rod is provided below the piston.

[0007] The push rod is in a "T" shape, and both sides of the upper end of the push rod are in contact with the inner wall of the cavity. The push rod slides up and down along the inner wall of the cavity, and the lower end of the push rod passes through the lower end of the cavity and extends out of the valve body.

[0008] Furthermore, a front baffle is provided at the rear side of the oil quantity control valve, the front baffle is fixed on the diesel engine, and the oil quantity control valve is fixed on the front baffle.

[0009] Furthermore, the oil quantity control valve is fixed to the front end baffle through a fixing member.

[0010] Furthermore, a bolt hole is provided on the fixing member, and a bolt and a gasket are inserted into the bolt hole to fix the fixing member and the oil quantity control valve together on the front baffle.

[0011] Furthermore, the external thread of the end straight-through pipe joint is threadedly fixed to the internal thread of the blind cover, and the external thread of the blind cover is threadedly fixed to the internal thread of the top of the valve body.

[0012] Furthermore, a first gasket is provided between the end straight-through pipe joint and the blind cover, and a second gasket is provided between the blind cover and the top of the valve body.

[0013] Furthermore, the valve body is provided with an air hole near the bottom of the cavity.

[0014] Furthermore, an oil regulating shaft is provided at the bottom of the oil limiting rocker arm, and the oil regulating shaft is fixed to the front end baffle through a bearing.

[0015] Furthermore, a through hole is provided at one end of the oil limiting rocker arm, a hollow screw is inserted into the through hole, and the screw is fixed to the oil limiting rocker arm by an adjusting bolt and a locking nut.

[0016] The beneficial effects of the utility model are:

[0017] By controlling the top rod of the oil quantity control valve through the solenoid valve to hold the oil limiting rocker arm below, the maximum fuel supply of the diesel engine can be controlled at the initial start-up of the diesel engine to prevent the emission of black smoke caused by incomplete combustion due to excessive fuel supply. In addition, the fuel control mechanism of the utility model has a simple structure, strong versatility, and a low failure rate. It can be applied to diesel engines of different specifications. After loading on board, on-site debugging is also simple, reducing the burden on staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a cross-sectional view of the oil quantity control valve of the utility model;

[0020] Figure 3 It is a half-section schematic diagram of the practical oil quantity control valve.

[0021] In the attached figure:

[0022] 10-front baffle;

[0023] 20- solenoid valve, 21- gas pipe;

[0024] 30- oil quantity control valve, 31- valve body, 32- piston, 33- push rod, 34- end straight pipe joint, 35- cover, 36- first gasket, 37- second gasket, 38- cavity, 39- vent hole;

[0025] 40-oil limiting rocker arm, 41-adjusting bolt, 42-locking nut, 43-screw;

[0026] 50-oil adjustment shaft, 60-fixing part. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional words used are used to illustrate rather than limit the creation of the present invention.

[0028] The utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0029] See also Figure 1-Figure 3 The utility model is a fuel control mechanism for a medium-speed four-stroke marine diesel engine, comprising a solenoid valve 20, a fuel quantity control valve 30 below the solenoid valve 20, and a fuel limiting rocker arm 40 below the fuel quantity control valve 30. The solenoid valve 20 is connected to the fuel quantity control valve 30 through an air line pipe 21.

[0030] A front baffle plate 10 is provided at the rear side of the oil quantity control valve 30, the front baffle plate 10 is fixed to the diesel engine, and the oil quantity control valve 30 is fixed to the front baffle plate 10. Specifically, the oil quantity control valve 30 is fixed to the front baffle plate 10 by a fixing member 60. In this embodiment, a bolt hole is provided on the fixing member 60, and a bolt and a gasket are inserted into the bolt hole to fix the fixing member 60 and the oil quantity control valve 30 to the front baffle plate 10 together.

[0031] See also Figure 2 and Figure 3 The oil quantity control valve 30 includes a valve body 31 and an end straight pipe joint 34 fixed to the top of the valve body 31. The gas line pipe 21 passes through the center hole of the end straight pipe joint 34 and communicates with the piston 32 inside the oil quantity control valve 30. A blind cover 35 is provided between the end straight pipe joint 34 and the valve body 31, and the external thread of the end straight pipe joint 34 is screwed and fixed to the internal thread of the blind cover 35, and the external thread of the blind cover 35 is screwed and fixed to the internal thread at the top of the valve body 31.

[0032] A first gasket 36 is provided between the end straight pipe joint 34 and the cover 35 to play a sealing role and prevent air leakage. A second gasket 37 is provided between the cover 35 and the top of the valve body 31 to also play a sealing role and prevent air leakage.

[0033] In this embodiment, a cavity 38 is provided inside the valve body 31, a piston 32 is provided above the cavity, and a push rod 33 is provided below the piston 32. The push rod 33 is in a "T" shape, and the two sides of the upper end of the push rod 33 are in contact with the inner wall of the cavity 38, and the push rod 33 can slide up and down along the inner wall of the cavity 38, and the lower end of the push rod 33 passes through the lower end of the cavity 38 and extends out of the valve body 31.

[0034] A vent hole 39 is provided near the bottom of the cavity 38 of the valve body 31 to connect the space below the push rod 33 with the outside air. The push rod 33 will not run slowly due to changes in the air pressure below, ensuring that the push rod 33 moves up and down smoothly.

[0035] In this embodiment, an oil regulating shaft 50 is provided at the bottom of the oil limiting rocker arm 40, and the oil regulating shaft 50 is fixed on the front baffle 10 through a bearing, and the oil regulating shaft 50 is also fixedly connected to each bearing seat (not shown in the figure) on the diesel engine. The rotation of the oil regulating shaft 50 drives the rotation of the oil limiting rocker arm 40 to adjust the oil supply change of the diesel engine. A through hole is provided at one end of the oil limiting rocker arm 40, and a hollow screw 43 is inserted into the through hole. The screw 43 is fixed to the oil limiting rocker arm 40 by an adjusting bolt 41 and a locking nut 42. The lower end of the screw 43 is connected and fixed to the oil pipe (not shown in the figure) on the diesel engine. By rotating the adjusting bolt 41, the screw 43 can be driven to move up and down, thereby driving the oil pipe to move up and down, thereby adjusting the oil output.

[0036] When the utility model is used, the staff first adjusts the adjustment bolt 41 and the locking nut 42 to fine-tune the rotation range of the oil-limiting rocker arm 40. After the adjustment, the diesel engine is started, the diesel engine's security system controls the solenoid valve 20 to be energized, and the compressed gas enters the cavity 38 of the oil quantity control valve 30 through the solenoid valve 20. The piston 32 pushes the push rod 33, and the push rod 33 is subjected to the downward force from the compressed air, and moves downward to support the oil-limiting rocker arm 40, limiting the rotation range of the oil-limiting rocker arm 40, thereby achieving the purpose of limiting the maximum fuel supply. When the diesel engine speed reaches the operating speed, the security system controls the solenoid valve 20 to lose power, and the compressed gas in the oil quantity control valve 30 is discharged through the solenoid valve 20. The air under the cavity 38 and the push rod 33 is connected to the ambient air, and the pressure is the same. The push rod 33 is not subjected to the downward force of the compressed air, and the gravity of the push rod 33 itself is not enough to limit the rotation range of the oil-limiting rocker arm 40, and the restriction on the oil-limiting rocker arm 40 is released, that is, the restriction on the maximum fuel supply of the diesel engine is released.

[0037] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A fuel control mechanism for a medium-speed four-stroke marine diesel engine, characterized in that: It comprises a solenoid valve (20), an oil quantity control valve (30) below the solenoid valve (20), and an oil limiting rocker arm (40) below the oil quantity control valve (30), wherein the solenoid valve (20) and the oil quantity control valve (30) are connected via an air line pipe (21); The oil quantity control valve (30) comprises a valve body (31) and an end straight pipe joint (34) fixed to the top of the valve body (31); the gas line pipe (21) passes through the central hole of the end straight pipe joint (34) and communicates with the piston (32) inside the oil quantity control valve (30); A blind cover (35) is provided between the end straight-through pipe joint (34) and the valve body (31); A cavity (38) is provided inside the valve body (31), the piston (32) is provided above the cavity, and a push rod (33) is provided below the piston (32); The push rod (33) is in a "T" shape, and the two sides of the upper end of the push rod (33) are in contact with the inner wall of the cavity (38). The push rod (33) slides up and down along the inner wall of the cavity (38), and the lower end of the push rod (33) passes through the lower end of the cavity (38) and extends out of the valve body (31).

2. A fuel control mechanism for a medium-speed four-stroke marine diesel engine according to claim 1, characterized in that: A front baffle (10) is provided at the rear side of the oil quantity control valve (30); the front baffle (10) is fixed on the diesel engine, and the oil quantity control valve (30) is fixed on the front baffle (10).

3. A fuel control mechanism for a medium-speed four-stroke marine diesel engine according to claim 2, characterized in that: The oil quantity control valve (30) is fixed to the front end baffle (10) via a fixing member (60).

4. A fuel control mechanism for a medium-speed four-stroke marine diesel engine according to claim 3, characterized in that: The fixing member (60) is provided with a bolt hole, into which a bolt and a gasket are inserted, so that the fixing member (60) and the oil quantity control valve (30) are fixed together on the front baffle (10).

5. A fuel control mechanism for a medium-speed four-stroke marine diesel engine according to claim 1, characterized in that: The external thread of the end straight-through pipe joint (34) is threadedly fixed to the internal thread of the blind cover (35), and the external thread of the blind cover (35) is threadedly fixed to the internal thread at the top of the valve body (31).

6. A fuel control mechanism for a medium-speed four-stroke marine diesel engine according to claim 5, characterized in that: A first gasket (36) is provided between the end straight-through pipe joint (34) and the blind cover (35), and a second gasket (37) is provided between the blind cover (35) and the top of the valve body (31).

7. A fuel control mechanism for a medium-speed four-stroke marine diesel engine according to claim 1, characterized in that: The valve body (31) is provided with an air hole (39) near the bottom of the cavity (38).

8. A fuel control mechanism for a medium-speed four-stroke marine diesel engine according to claim 3, characterized in that: An oil regulating shaft (50) is provided at the bottom of the oil limiting rocker arm (40), and the oil regulating shaft (50) is fixed to the front end baffle (10) via a bearing.

9. A fuel control mechanism for a medium-speed four-stroke marine diesel engine according to claim 8, characterized in that: A through hole is formed at one end of the oil limiting rocker arm (40), a hollow screw rod (43) is inserted into the through hole, and the screw rod (43) is fixed to the oil limiting rocker arm (40) via an adjusting bolt (41) and a locking nut (42).

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