A method and device for start-stop lubrication control of an underwater exhaust engine

Abstract

The application discloses a kind of underwater exhaust engine start-stop lubrication control method and device, and the starting lubrication method is, S1: turning gear starts;With the air entering the engine is discharged from the exhaust port at the end of exhaust pipeline under water;S2: turning gear lubrication;With the engine lubrication system is in working condition when the turning gear starts;S3: high-speed ignition;With the engine is smoothly started in high-speed operation state;While closing the turning gear mechanism;S4: switch lubricating oil pump;When the speed of crankshaft reaches or exceeds the preset idle speed, the auxiliary lubrication mechanism is closed, and at the same time, the lubrication system of the engine is switched on and works;Starting lubrication is completed.The application can supply oil before starting and lubricate moving parts by turning gear, avoid oil high-temperature adhesion after shutdown and supply oil by turning gear, reduce the wear of engine moving parts, and prolong the service life of engine.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underwater exhaust engine, and particularly relates to a start-stop lubrication control method and device for an underwater exhaust engine. BACKGROUND

[0002] Similar to the underwater exhaust engine described in patent numbers JP08246927A, JP3497268B2 and CN109026385B, the air inlet port at the end of the air inlet pipeline of the engine is located above the water surface to suck air, and the exhaust port at the end of the exhaust pipeline is located below the water surface to make the engine exhaust waste gas into the water. The problem is that the exhaust resistance in the water is large, which affects the operation performance of the engine, especially when the engine starts, the low speed of the engine and the exhaust in the water will cause starting difficulty. Secondly, after the engine stops, water will inevitably enter the exhaust pipeline, and even the water in the cylinder of the engine will occur. In addition, the engine has low speed in the start and stop working state, and the oil pump of the engine cannot provide enough oil for the lubrication of the related parts of the engine, and the wear is aggravated. The starting wear of the engine accounts for about 50% of the total wear of the engine, especially when the temperature is low, the viscosity of the oil is large, and the flowability is poor, due to the slow pumping of the oil pump, the starting wear of the moving parts of the engine will be larger after starting and heating for a long time. In addition, when the engine is suddenly stopped during heavy load operation, the oil temperature is high and the viscosity is low, and the moving parts are easily adhered, and the dry friction of the moving parts during the next starting process is easy to cause wear of the moving parts. Correctly controlling the start-stop wear of the engine is the key to prolonging the service life of the engine. SUMMARY

[0003] In order to overcome the deficiencies in the prior art, the application provides a start-stop lubrication control method and device for an underwater exhaust engine, which is designed according to the working characteristics of the underwater exhaust engine, and a turning gear system and a lubrication system are designed. Through turning and auxiliary lubrication without fuel supply during starting and stopping, the engine can be well lubricated during starting and stopping, the reliability is improved, and the service life of the working parts is prolonged.

[0004] To achieve the above application purpose, the application provides a start-up lubrication control method for an underwater exhaust engine; comprising the following steps:

[0005] S1: turning gear starting; before the engine is ignited and started, a turning gear mechanism connected to the outside of the engine is started, and under the condition that the engine has no fuel supply, the turning gear mechanism drives multiple pistons of the engine to reciprocate in the corresponding cylinders according to the ignition sequence; so that the air entering the engine is exhausted from the exhaust port at the end of the exhaust pipeline under the water; and gradually increase the rotation speed of the crankshaft of the engine under the continuous action of the turning gear mechanism;

[0006] S2: Lubrication during cranking; when the cranking mechanism in step S1 is started, the auxiliary lubrication mechanism outside the engine is also started; the auxiliary lubrication mechanism pumps oil into the main oil passage of the engine, so that the engine lubrication system is in working condition when the cranking is started;

[0007] S3: High-speed ignition; the engine crankshaft speed is detected, and when the crankshaft speed is detected to reach or exceed the preset ignition speed, the fuel supply mechanism of the engine is started to provide fuel to the engine, so that the engine is started smoothly in the high-speed operation state; at the same time, the cranking mechanism is stopped;

[0008] S4: Switching of the lubricating oil pump; after step S3, the engine crankshaft speed has exceeded the ignition speed, and when the crankshaft speed reaches or exceeds the preset idle speed, the auxiliary lubrication mechanism is stopped, and at the same time, the engine's own oil pump starts to pump oil into the main oil passage; the engine's own lubrication system is switched to work; the lubrication is completed.

[0009] The working principle includes that before the engine is ignited and started, the piston reciprocates through the cranking mechanism, and the exhaust pipe of the engine exhausts air outward, and the water entering the exhaust pipe is pushed out during the exhaust process; wherein the air entering the engine can at least be the air sucked from the air inlet pipe during the movement of the piston. At the same time, lubrication is provided during the cranking operation stage to provide lubrication protection for moving parts. When the crankshaft speed reaches the ignition speed, the air exhausted from the exhaust pipe is sufficient to overcome the water pressure backflow, and at this time, ignition starting is performed again, overcoming the exhaust resistance. Then, when the engine is successfully ignited and started, the exhaust pipe can still exhaust sufficient exhaust gas, which can also overcome the exhaust resistance to ensure normal operation of the engine. Finally, the lubricating oil pump is switched, and the engine provides lubrication by itself. Therefore, good lubrication protection can be obtained during the entire engine ignition starting process, the reliability of the engine is improved, and the working life is prolonged.

[0010] In order to further improve the reliability, when a starting failure occurs, the cranking starting process is terminated in time, and an alarm signal is sent for maintenance treatment. The step S3 further includes a cranking starting failure processing step S31, which is as follows:

[0011] S31: Start timing with the starting of the cranking mechanism and the auxiliary lubrication mechanism, and after 3-10 seconds, if the speed of the crankshaft does not reach 10-30 rpm, stop the cranking mechanism and the auxiliary lubrication mechanism, and send a cranking starting failure warning.

[0012] The effect is that, generally, 3-10 seconds after the piston opens the movement, the crankshaft speed is sufficient to reach 10-30 revolutions per minute. If the cranking mechanism is started 3-10 seconds later and the crankshaft still does not reach 10-30 revolutions per minute, it indicates that the cranking mechanism is working abnormally, so as to stop in time and repair the cranking mechanism.

[0013] In order to further improve the reliability, when starting failure occurs, the cranking starting process is terminated in time and an alarm signal is sent for maintenance treatment. The step S3 further comprises an ignition starting failure treatment step S32, which is specifically as follows:

[0014] S32: Start timing with the simultaneous starting of the cranking mechanism and the auxiliary lubrication mechanism. After 3-10 seconds, if the speed does not reach 50-80 revolutions per minute, the cranking mechanism and the auxiliary lubrication mechanism are turned off, and an ignition starting failure warning is sent.

[0015] The effect is that, generally, 3-10 seconds after the piston opens the movement, the crankshaft speed is sufficient to reach 50-80 revolutions per minute. If the cranking mechanism is started 3-10 seconds later and the crankshaft still does not reach 50-80 revolutions per minute, it indicates that the cranking mechanism is working abnormally, or the engine ignition starting is abnormal, the engine cannot reach the ignition speed, and fuel cannot be input. At this time, stop in time and repair the cranking mechanism or the engine.

[0016] In order to further improve the reliability, when starting failure occurs, the cranking starting process is terminated in time and an alarm signal is sent for maintenance treatment. The step S4 further comprises an idling failure treatment step S41, which is specifically as follows:

[0017] S41: Start timing with the simultaneous starting of the cranking mechanism and the auxiliary lubrication mechanism. After 3-10 seconds, if the crankshaft speed does not reach 150-300 revolutions per minute, the fuel supply mechanism and the cranking mechanism are turned off, the auxiliary lubrication mechanism continues to work, and an idling failure warning is sent. If the crankshaft speed exceeds 450-600 revolutions per minute after 3-10 seconds, the cranking mechanism and the auxiliary lubrication mechanism are turned off, and the engine works independently to complete the starting lubrication.

[0018] The effect is that, generally, 3-10 seconds after the piston opens the movement, the engine has been ignited and started, and the crankshaft speed is sufficient to reach the idling speed. If the cranking mechanism is started 3-10 seconds later and the crankshaft still does not reach 150-300 revolutions per minute, it indicates that the engine is working abnormally and cannot stabilize the idling speed. Stop in time and repair the engine. If the crankshaft reaches 450-600 revolutions per minute, it indicates that the engine has been started and can stably maintain the idling state, so the cranking and auxiliary lubrication can be exited and the engine can work independently.

[0019] In order to further improve the reliability of the exhaust pipe drainage, a slow cranking phase is included, which is specifically as follows:

[0020] Simultaneously starting timing of the cranking mechanism and the auxiliary lubrication mechanism, maintaining the rotating speed of the crankshaft at 10-30 rpm through the cranking mechanism, and then increasing the rotating speed of the crankshaft through the cranking mechanism.

[0021] The main effect is to prolong the cranking time, so that more time is available for the water drainage operation, and the engine exhaust pipe can be entered more. On the one hand, the water drainage operation can be better completed, and on the other hand, the long-time low-speed lubrication can better protect the moving parts of the engine.

[0022] The application also provides a stopping lubrication control method of the underwater exhaust engine.

[0023] S5: speed reduction lubrication; when the engine receives a stopping control signal, the fuel supply mechanism of the engine is closed to stop providing fuel to the engine, and the engine is reduced in speed; at the same time, the auxiliary lubrication mechanism connected to the engine is also started; under the condition that the engine is not supplied with fuel, the auxiliary lubrication mechanism pumps oil into the main oil way of the lubricating oil of the engine, so that the lubricating system of the engine is in a working state when the engine is reduced in speed;

[0024] S6: cranking restart; detecting the rotating speed of the crankshaft, and when the rotating speed of the crankshaft is detected to be less than 10-30 rpm, starting the cranking mechanism connected to the engine, driving the plurality of pistons of the engine to reciprocate in the corresponding cylinders according to the firing sequence under the condition that the engine is not supplied with fuel, so that the air entering the engine is discharged from the exhaust port at the end of the exhaust pipeline under water; at this time, the auxiliary lubrication mechanism continues to work;

[0025] S7: continuous lubrication; maintaining the rotating speed of the crankshaft at 10-30 rpm through the cranking mechanism; at this time, the auxiliary lubrication mechanism continues to work; the cranking mechanism and the auxiliary lubrication mechanism continue to work for 10-30 seconds, and then step S8 is performed;

[0026] S8: cranking stop; the auxiliary lubrication mechanism is stopped, the cranking mechanism continues to work for 5-10 seconds and is then stopped, the rotating speed of the crankshaft is reduced, and the stopping lubrication is completed when the rotating speed of the crankshaft is reduced to 0 rpm.

[0027] The working principle comprises the following steps: when the engine stops running due to fuel cut-off, especially in an emergency, the engine stops running at high speed, and the lubrication protection is lost quickly; due to inertia, the piston and other moving parts still move at high speed, and the wear is intensified. Therefore, after the engine receives a stop command, the auxiliary lubrication is started to improve the lubrication protection of the engine during the process of the rotation speed of the crankshaft decreasing. When the rotation speed of the crankshaft decreases to the starting rotation speed of the cranking, i.e. 10-30 rpm, the cranking is restarted to avoid the sharp decrease of the exhaust pressure caused by the emergency stop of the engine, and to prevent a large amount of water from flowing into the exhaust pipeline. The cranking lubrication is continued for a period of time to maintain the exhaust state of the exhaust pipeline, which can cool the engine on one hand to avoid the heat accumulation in the engine after the emergency stop, and the heat is discharged through the exhaust; on the other hand, the exhaust pipeline is in a low exhaust pressure state, which can avoid the great change of the pressure after the exhaust is stopped, thereby causing a large amount of water to flow back into the exhaust pipeline. Finally, the cranking is maintained for a period of time after the auxiliary lubrication is stopped to avoid the high-temperature adhesion of the oil, and to promote the oil return to the oil sump.

[0028] The application further provides a start-stop lubrication control device of an underwater exhaust engine, which comprises a water equipment with the underwater exhaust engine, an air inlet port at the end of an air inlet pipeline of the underwater exhaust engine is located above the water surface to suck air, an exhaust port at the end of an exhaust pipeline of the underwater exhaust engine is located below the water surface, the underwater exhaust engine is connected with a cranking mechanism, which is used for driving a plurality of pistons of the engine to reciprocate in corresponding cylinders according to a firing sequence under the condition that the engine is not supplied with fuel through the cranking mechanism, the underwater exhaust engine is connected with an auxiliary lubrication mechanism, which is used for pumping oil into a main oil channel of lubricating oil of the engine through the auxiliary lubrication mechanism under the condition that the engine is not supplied with fuel, the cranking mechanism and the auxiliary lubrication mechanism are installed on the water equipment and are used for working in a non-water environment, and the device further comprises a controller connected with the underwater exhaust engine, the cranking mechanism and the auxiliary lubrication mechanism, which is used for controlling the start and stop of the cranking mechanism and the auxiliary lubrication mechanism according to the working state of the engine.

[0029] It can be seen that the start lubrication and the stop lubrication of the above-mentioned two working conditions can be met through a set of auxiliary lubrication and cranking mechanisms on the water equipment.

[0030] An exemplary turning gear mode, the turning gear is a pneumatic turning gear, the pneumatic turning gear comprises a high-pressure gas tank; the high-pressure gas tank is provided with a gas conveying pipe corresponding to each cylinder of the underwater exhaust engine, the end of the gas conveying pipe is communicated with the cylinder for inputting high-pressure air into the cylinder; a valve is arranged on each gas conveying pipe; the plurality of valves are connected with the controller to control the opening and closing of the valves; one end of the underwater exhaust engine is provided with a timing wheel for corresponding to the position of the piston in the cylinder through the phase of the rotation of the timing wheel; the timing wheel is connected with the controller through a timing belt transmission mechanism, so that when the piston in each cylinder rises to the top dead center position, the corresponding valve of the cylinder is controlled to be opened; the high-pressure gas tank is connected with an air pump for supplementing air into the high-pressure gas tank.

[0031] On the one hand, the piston is driven to move by air pressure, the driving force is soft, and the related parts are prevented from being damaged by impact overload, and on the other hand, not only the air naturally inhaled by the engine is used as exhaust air to push water, but also more air is supplemented in the cylinder, so that more air source can be obtained at a lower crankshaft speed, more air is discharged, and water discharge is more favorable. In addition, by spraying high-pressure air into the cylinder, the accumulated water in the cylinder can be better discharged, and the device is more suitable for the case of water entering the cylinder.

[0032] An exemplary auxiliary lubrication mode, the auxiliary lubrication mechanism comprises an auxiliary oil pump, an oil inlet pipe of the auxiliary oil pump is communicated with an oil pan of the underwater exhaust engine, and an oil outlet pipe of the auxiliary oil pump is communicated with a main oil passage for conveying the oil stored in the oil pan to the main oil passage; the auxiliary oil pump is connected with the controller for controlling the start and stop of the auxiliary oil pump according to the instruction of the controller.

[0033] It can be seen that the auxiliary lubrication mechanism is in parallel connection with the lubrication system of the engine, and both can work independently and be conveniently switched.

[0034] The advantages of the present application over the prior art are that:

[0035] (1) A set of auxiliary lubrication and turning gear mechanism can meet the starting lubrication and shutdown lubrication conditions.

[0036] (2) The underwater exhaust engine can obtain sufficient lubrication protection during starting, normal working and shutdown.

[0037] (3) Delayed shutdown can avoid high-temperature adhesion of oil, promote the return of oil to the oil pan, and provide protection for the next engine start.

[0038] (4) The device has simple structure, low cost and convenient use.

[0039] In summary, the present application can lubricate the moving parts by pre-provision of oil and turning before starting, avoid high temperature adhesion of oil after stopping, reduce the wear of the moving parts and prolong the life of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0040] Fig. 1 The structure diagram of the embodiment of the present application is shown in the figure.

[0041] Fig. 2 The connection structure diagram of the auxiliary lubricating mechanism of the embodiment of the present application is shown in the figure.

[0042] Fig. 3 The connection structure diagram of the turning mechanism of the embodiment of the present application is shown in the figure.

[0043] The relationship between the technical features and the reference signs in the figure is as follows: turning mechanism 1; high-pressure gas tank 11; gas conveying pipe 12; valve 13; underwater exhaust engine 2; air inlet pipe 21; exhaust pipe 22; main oil passage 23; timing wheel 24; timing belt transmission mechanism 25; oil sump 26; cylinder 27; piston 28; auxiliary lubricating mechanism 3; auxiliary oil pump 31; oil inlet pipe 32; oil outlet pipe 33; controller 4; rotating speed sensor 41; underwater equipment 5; water surface 51. DETAILED DESCRIPTION

[0044] The present application will be described in detail below with reference to the accompanying drawings. It should be apparent that the described embodiments are only a part of the preferred embodiments of the present application, but not all the embodiments. Those skilled in the art should understand that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0045] Embodiment 1: please refer to Figs. 1-3 ;

[0046] The application discloses a start-stop lubrication control device for a water exhaust engine, which comprises a water equipment 5 provided with the water exhaust engine 2, an air inlet port of an air inlet pipe 21 of the water exhaust engine 2 is located above the water surface to inhale air, an air outlet port of an air outlet pipe of the water exhaust engine 2 is located below the water surface, the water exhaust engine 2 is connected with a turning gear 1, the turning gear 1 is used for driving a plurality of pistons 28 of the water exhaust engine to reciprocate in corresponding cylinders 27 according to a firing sequence under the condition that the water exhaust engine is not supplied with fuel, the water exhaust engine 2 is connected with an auxiliary lubrication mechanism 3, the auxiliary lubrication mechanism 3 is used for pumping engine oil into a main oil channel 23 of lubricating oil of the water exhaust engine under the condition that the water exhaust engine is not supplied with fuel, the turning gear 1 and the auxiliary lubrication mechanism 3 are installed on the water equipment 5 and are used for working in a non-water environment, and the water exhaust engine 2, the turning gear 1 and the auxiliary lubrication mechanism 3 are all connected with a controller 4, the controller 4 is used for controlling start and stop of the turning gear 1 and the auxiliary lubrication mechanism 3 according to a working state of the water exhaust engine.

[0047] For example, the water equipment 5 can be a diving equipment, so that the air inlet port is located above the water surface after the diving equipment is floated, wherein the diving equipment is provided with a valve 13 on the air inlet port of the water exhaust engine 2, so that the air inlet pipe 21 is closed to prevent water from entering the water exhaust engine when the diving equipment is submerged, and the diving equipment can be a salvage equipment, the air inlet port of the salvage equipment is located above the water surface when the salvage equipment works underwater, so that the salvage equipment can work underwater for a long time.

[0048] In a preferred embodiment, the auxiliary lubrication mechanism 3 comprises an auxiliary oil pump 31, an oil inlet pipe 32 of the auxiliary oil pump 31 is communicated with an oil pan 26 of the water exhaust engine 2, an oil outlet pipe 33 of the auxiliary oil pump 31 is communicated with the main oil channel 23, and the auxiliary oil pump 31 is used for conveying engine oil stored in the oil pan 26 to the main oil channel 23, the auxiliary oil pump 31 is connected with the controller 4, and the controller 4 is used for controlling start and stop of the auxiliary oil pump 31 according to an instruction of the controller 4.

[0049] For the turning, the pinion of the electric motor or compressed air motor can be engaged with the flywheel ring gear of the engine, and the crankshaft is driven to rotate by the motor until the engine ignition speed is reached. However, in a preferred embodiment, the turning mechanism 1 is a pneumatic turning mechanism, which comprises a high-pressure air tank 11; the high-pressure air tank 11 is provided with a gas delivery pipe 12 corresponding to each cylinder 27 of the underwater exhaust engine 2, and the end of the gas delivery pipe 12 communicates with the cylinder 27 for inputting high-pressure air into the cylinder 27; each gas delivery pipe 12 is provided with a valve 13; a plurality of valves 13 are connected with the controller 4 to control the opening and closing of the valves 13; one end of the underwater exhaust engine 2 is provided with a timing wheel 24 for corresponding to the position of the piston 28 in the cylinder 27 through the rotation of the timing wheel; the timing wheel 24 is connected with the controller 4 through a timing belt transmission mechanism 25 for controlling the opening of the corresponding valve 13 when the piston 28 in each cylinder 27 rises to the top dead center position; the high-pressure air tank 11 is connected with an air pump for supplementing air into the high-pressure air tank 11.

[0050] For the turning and draining of the air pressure driven piston 28, reference can also be made to the existing patent disclosed technical solutions, such as the patent with the publication number CN110529248B "Air distribution starting system for high-speed diesel engine".

[0051] In order to detect the rotation speed of the engine crankshaft, one embodiment is as shown in Fig. 2 , the controller 4 cable connected sensor is installed on the engine to obtain the rotation speed of the crankshaft; another embodiment is as shown in Fig. 3 , the rotation speed sensor 41 is arranged in the controller 4, and the rotation speed of the crankshaft is calculated by detecting a belt pulley of the timing belt transmission mechanism 25 connected to the controller 4.

[0052] The exemplary use method when in use includes the following steps:

[0053] S1: turning on; before the engine ignition starts, the turning mechanism 1 connected to the engine is started, and under the condition that the engine has no fuel supply, the pistons 28 of the engine are driven to reciprocate in the corresponding cylinders 27 according to the firing sequence by the turning mechanism 1; so that the air entering the engine is discharged from the exhaust port at the end of the underwater exhaust pipe; and under the continuous action of the turning mechanism 1, the rotation speed of the crankshaft of the engine is gradually increased;

[0054] S2: Lubrication during cranking; when the cranking mechanism 1 in step S1 is started, the auxiliary lubrication mechanism 3 outside the engine is also started; the auxiliary lubrication mechanism 3 pumps oil into the main oil passage 23 of the engine, so that the engine lubrication system is in working condition when the cranking is started;

[0055] S3: High-speed ignition; the engine crankshaft speed is detected, and when it is detected that the crankshaft speed reaches or exceeds the preset ignition speed, the fuel supply mechanism of the engine is started to provide fuel to the engine, so that the engine is started smoothly in the high-speed running state; at the same time, the cranking mechanism 1 is stopped;

[0056] Wherein, during the gradual increase of the crankshaft speed, it is checked in stages to timely find out the starting failure and facilitate maintenance, and the specific method comprises:

[0057] S31: Start timing with the simultaneous starting of the cranking mechanism 1 and the auxiliary lubrication mechanism 3, and after 3-10 seconds, if the crankshaft speed does not reach 10-30 rpm, stop the cranking mechanism 1 and the auxiliary lubrication mechanism 3, and issue a cranking starting failure warning;

[0058] If the cranking mechanism 1 is normal, the crankshaft speed will be further increased, and ignition detection will be performed, which is specifically as follows:

[0059] S32: Start timing with the simultaneous starting of the cranking mechanism 1 and the auxiliary lubrication mechanism 3, and after 3-10 seconds, if the speed does not reach 50-80 rpm, stop the cranking mechanism 1 and the auxiliary lubrication mechanism 3, and issue an ignition starting failure warning;

[0060] If the engine ignition is normal, the crankshaft speed will be further increased, and idle speed detection will be performed, which is specifically as follows:

[0061] S4: Switching of the oil pump; after step S3, specifically, after step S32, the engine crankshaft speed has exceeded the ignition speed, and when the crankshaft speed reaches or exceeds the preset idle speed, the auxiliary lubrication mechanism 3 is stopped, and at the same time, the oil pump of the engine starts to work to pump oil into the main oil passage 23; switching to the working of the lubrication system of the engine itself;

[0062] Wherein, start timing with the simultaneous starting of the cranking mechanism 1 and the auxiliary lubrication mechanism 3, and after 3-10 seconds, if the crankshaft speed does not reach 150-300 rpm, the fuel supply mechanism and the cranking mechanism 1 are stopped, the auxiliary lubrication mechanism 3 continues to work, and an idle speed failure warning is issued; if the crankshaft speed exceeds 450-600 rpm after the 3-10 seconds, the cranking mechanism 1 and the auxiliary lubrication mechanism 3 are stopped; the engine works independently, and the lubrication is completed.

[0063] In another embodiment, before step S3, slow cranking is performed to facilitate drainage, specifically, when the cranking mechanism 1 and the auxiliary lubrication mechanism 3 are started simultaneously, the time is recorded, and the speed of the crankshaft is maintained at 10-30 rpm by the cranking mechanism 1 for 20-80 seconds, and then the speed of the crankshaft is increased by the cranking mechanism 1 until the ignition speed required in step S3 is reached, and steps S3-S4 are performed to complete the start-up.

[0064] After the start-up lubrication is completed, the engine operates autonomously until a shutdown signal is received, and the engine is prepared to be shut down, at which time the following steps are performed:

[0065] S5: Lubrication at a reduced speed; when the engine receives a shutdown control signal, the fuel supply mechanism of the engine is closed to stop providing fuel to the engine, and the engine is slowed down; at the same time, the auxiliary lubrication mechanism 3 connected to the engine is also started; under the condition that the engine has no fuel supply, oil is pumped into the main oil passage 23 of the lubricating oil of the engine by the auxiliary lubrication mechanism 3, so that the engine lubrication system is in working condition when the engine is slowed down;

[0066] S6: Cranking restart; the speed of the crankshaft of the engine is detected, and when the speed of the crankshaft is detected to be less than 10-30 rpm, the cranking mechanism 1 connected to the engine is started, and under the condition that the engine has no fuel supply, the pistons 28 of the engine are driven to reciprocate in the corresponding cylinders 27 according to the firing order by the cranking mechanism 1, so that the air entering the engine is discharged from the exhaust port at the end of the exhaust pipeline under water; at this time, the auxiliary lubrication mechanism 3 continues to work;

[0067] S7: Continuous lubrication; the speed of the crankshaft is maintained at 10-30 rpm by the cranking mechanism 1; at this time, the auxiliary lubrication mechanism 3 continues to work; after the cranking mechanism 1 and the auxiliary lubrication mechanism 3 continue to work for 10-30 seconds, step S8 is performed;

[0068] S8: Cranking stop; the auxiliary lubrication mechanism 3 is turned off, and the cranking mechanism 1 continues to work for 5-10 seconds and then is turned off, and the speed of the crankshaft decreases until the speed of the crankshaft decreases to 0 rpm, and the shutdown lubrication is completed.

[0069] It should be noted that the cranking speed of 10-30 rpm, the ignition speed of 50-80 rpm, the idle speed of 150-300 rpm, and the working speed of 450-600 rpm in the present example are exemplary parameters, which can be adjusted as needed.

[0070] The advantages of the present embodiment are:

[0071] (1) A set of auxiliary lubrication and turning mechanism 1, can meet the starting lubrication and shutdown lubrication two working conditions.

[0072] (2) Underwater exhaust engine 2 can obtain sufficient lubrication protection when starting, normal work and shutdown.

[0073] (3) Delayed shutdown, avoid high temperature oil adhesion, promote oil backflow oil sump 26, provide guarantee for the next engine start.

[0074] In summary, the application can provide pre-oil supply and turning for moving parts before starting, and provide oil supply and turning after shutdown to avoid high temperature oil adhesion, reduce the wear of moving parts of the engine, and prolong the service life of the engine.

[0075] The part of the application not described in detail is the prior art; for those skilled in the art, any combination of the technical features of the above-mentioned embodiments can be made, in order to make the description simple, not all possible combinations of each technical feature in the above-mentioned embodiments are described, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope of the description.

Claims

1. A method of starting lubrication control for an underwater exhaust engine, characterized by, The method comprises the following steps: S1: cranking start; before the engine ignition start, the engine external cranking mechanism (1) is started, and under the condition that the engine has no fuel supply, the pistons (28) of the engine are driven to reciprocate in the corresponding cylinders (27) according to the firing order through the cranking mechanism (1); so that the air entering the engine is discharged from the exhaust port at the end of the underwater exhaust pipeline; and under the continuous action of the cranking mechanism (1), the crankshaft speed of the engine is gradually increased; S2: cranking lubrication; when the cranking mechanism (1) in step S1 is started, the auxiliary lubrication mechanism (3) external to the engine is also started; the oil pump of the auxiliary lubrication mechanism (3) pumps oil into the main oil passage (23) of the engine lubricating oil, so that the engine lubricating system is in working condition during the cranking start; S3: high-speed ignition; the engine crankshaft speed is detected, and when it is detected that the crankshaft speed reaches or exceeds the preset ignition speed, the fuel supply mechanism of the engine is started to provide fuel for the engine, so that the engine is started smoothly in the high-speed operation state; and the cranking mechanism (1) is stopped at the same time; S4: switch the lubricating oil pump; after step S3, the engine crankshaft speed has exceeded the ignition speed, and when the crankshaft speed reaches or exceeds the preset idle speed, the auxiliary lubrication mechanism (3) is stopped, and at the same time, the oil pump of the engine starts to work to pump oil into the main oil passage (23); switch to the working of the lubricating system of the engine; start lubrication; Wherein, the cranking mechanism (1) is a pneumatic cranking mechanism, the pneumatic cranking mechanism comprises a high-pressure gas tank (11); the high-pressure gas tank (11) is provided with a gas conveying pipe (12) corresponding to each cylinder (27) of the underwater exhaust engine (2), the end of the gas conveying pipe (12) communicates with the cylinder (27), and the gas conveying pipe (12) is used for driving the piston (28) in the cylinder (27) to move by inputting high-pressure air into the cylinder (27); each gas conveying pipe (12) is provided with a valve (13); a plurality of valve (13) are connected with the controller (4) to control the opening and closing of the valve (13); one end of the underwater exhaust engine (2) is provided with a timing wheel (24), which is used for corresponding the position of the piston (28) in the cylinder (27) through the phase of the timing wheel (24); the timing wheel (24) and the controller (4) are connected through a timing belt transmission mechanism (25), which is used for controlling the valve (13) corresponding to each cylinder (27) to open when the piston (28) in the cylinder (27) rises to the top dead center position, and controlling the valve (13) corresponding to the cylinder (27) to close when the piston (28) falls to the bottom dead center position; the high-pressure gas tank (11) is connected with an air pump for supplementing air in the high-pressure gas tank (11).

2. A method of starting lubrication control for a water-ventilated engine according to claim 1, characterized by, The step S3 further comprises a cranking start fault handling step S31, which is specifically as follows: S31: Start timing with the starting of the cranking mechanism (1) and the auxiliary lubrication mechanism (3) at the same time, and after 3-10 seconds, if the rotating speed of the crankshaft does not reach 10-30 revolutions per minute, the cranking mechanism (1) and the auxiliary lubrication mechanism (3) are turned off, and a cranking start failure warning is issued.

3. The method of claim 1, wherein, The step S3 further includes a step S32 of ignition start failure processing, which is specifically as follows: S32: Start timing with the starting of the cranking mechanism (1) and the auxiliary lubrication mechanism (3) at the same time, and after 3-10 seconds, if the rotating speed does not reach 50-80 revolutions per minute, the cranking mechanism (1) and the auxiliary lubrication mechanism (3) are turned off, and an ignition start failure warning is issued.

4. The method of claim 1, wherein, The step S4 further includes a step S41 of idling failure processing, which is specifically as follows: S41: Start timing with the starting of the cranking mechanism (1) and the auxiliary lubrication mechanism (3) at the same time, and after 3-10 seconds, if the rotating speed of the crankshaft does not reach 150-300 revolutions per minute, the fuel supply mechanism and the cranking mechanism (1) are turned off, the auxiliary lubrication mechanism (3) continues to work, an idling failure warning is issued, and if the rotating speed of the crankshaft exceeds 450-600 revolutions per minute after the 3-10 seconds, the cranking mechanism (1) and the auxiliary lubrication mechanism (3) are turned off; the engine works autonomously, and the lubrication is completed.

5. The method of claim 1, wherein, The slow cranking phase includes the following steps: Start timing with the starting of the cranking mechanism (1) and the auxiliary lubrication mechanism (3) at the same time, and continue for 20-80 seconds, control the rotating speed of the crankshaft to be maintained at 10-30 revolutions per minute through the cranking mechanism (1), and then control the rotating speed of the crankshaft to be increased through the cranking mechanism (1).

6. A method of shutdown lubrication control for an underwater exhaust engine, characterized by, The step S5 includes the following steps: S5: Slow-speed lubrication; when the engine receives a shutdown control signal, the fuel supply mechanism of the engine is turned off to stop providing fuel to the engine, the engine is slowed down, and at the same time, the auxiliary lubrication mechanism (3) connected to the outside of the engine is started; under the condition that the engine has no fuel supply, the auxiliary lubrication mechanism (3) pumps oil into the main oil passage (23) of the lubricating oil of the engine, so that the engine lubrication system is in working condition when the engine is slowed down; S6: Cranking restart; detect the rotating speed of the crankshaft, and when it is detected that the rotating speed of the crankshaft is less than 10-30 revolutions per minute, start the cranking mechanism (1) connected to the outside of the engine, and under the condition that the engine has no fuel supply, drive the pistons (28) of the engine to reciprocate in the corresponding cylinders (27) according to the firing order through the cranking mechanism (1), so that the air entering the engine is discharged from the exhaust port at the end of the exhaust pipeline under water; at this time, the auxiliary lubrication mechanism (3) continues to work; S7: Continuous lubrication; control the rotating speed of the crankshaft to be maintained at 10-30 revolutions per minute through the cranking mechanism (1); at this time, the auxiliary lubrication mechanism (3) continues to work; after the cranking mechanism (1) and the auxiliary lubrication mechanism (3) continue to work for 10-30 seconds, proceed to step S8; S8: the disc is stopped; the auxiliary lubricating mechanism (3) is stopped, the disc mechanism (1) continues to work for 5-10 seconds and then is stopped, the rotating speed of the crankshaft is reduced until the rotating speed of the crankshaft is reduced to 0 r / min, and the lubrication in the stop state is completed; Wherein, the disc mechanism (1) is a pneumatic disc mechanism, the pneumatic disc mechanism comprises a high-pressure air tank (11); the high-pressure air tank (11) is provided with a gas conveying pipe (12) corresponding to each cylinder (27) of the underwater exhaust engine (2), the tail end of the gas conveying pipe (12) is communicated with the cylinder (27), and the tail end is used for pushing the piston (28) in the cylinder (27) to move by inputting high-pressure air into the cylinder (27); each gas conveying pipe (12) is provided with a valve (13); a plurality of valve (13) are connected with the controller (4) to control the opening and closing of the valve (13); one end of the underwater exhaust engine (2) is provided with a timing wheel (24), which is used for corresponding the position of the piston (28) in the cylinder (27) through the phase of the rotation of the timing wheel (24); the timing wheel (24) is connected with the controller (4) through a timing belt transmission mechanism (25), which is used for controlling the valve (13) corresponding to each cylinder (27) to open when the piston (28) in the cylinder (27) rises to the top dead center position, and controlling the valve (13) corresponding to the cylinder (27) to close when the piston (28) falls to the bottom dead center position; the high-pressure air tank (11) is connected with an air pump, which is used for supplementing air into the high-pressure air tank (11).

7. A start-stop lubrication control device of an underwater exhaust engine, comprising a water device (5) with the underwater exhaust engine (2) according to claim 1 or 6, wherein the air inlet port at the tail end of the air inlet pipeline of the underwater exhaust engine (2) can be located above the water surface to suck air, and the exhaust port at the tail end of the exhaust pipeline is located below the water surface, characterized in that: The underwater exhaust engine (2) is connected with a disc mechanism (1), which is used for driving a plurality of pistons (28) of the engine to reciprocate in corresponding cylinders (27) according to the firing order under the condition that the engine is not supplied with fuel through the disc mechanism (1); The underwater exhaust engine (2) is connected with an auxiliary lubricating mechanism (3), which is used for pumping oil into the main oil way (23) of the lubricating oil of the engine under the condition that the engine is not supplied with fuel through the auxiliary lubricating mechanism (3); The disc mechanism (1) and the auxiliary lubricating mechanism (3) are installed on the water device (5) and are used for working in a waterless environment; Further comprising a controller (4) connected with the underwater exhaust engine (2), the disc mechanism (1) and the auxiliary lubricating mechanism (3), which is used for controlling the start-stop of the disc mechanism (1) and the auxiliary lubricating mechanism (3) according to the working state of the engine.

8. A start-stop lubrication control device for an underwater exhaust engine according to claim 7, characterized by: The auxiliary lubricating mechanism (3) comprises an auxiliary oil pump (31), an oil inlet pipe (32) of the auxiliary oil pump (31) is communicated with an oil pan (26) of the underwater exhaust engine (2), an oil outlet pipe (33) of the auxiliary oil pump (31) is communicated with the main oil passage (23), and the oil outlet pipe (33) is used for conveying engine oil stored in the oil pan (26) to the main oil passage (23); and the auxiliary oil pump (31) is connected with the controller (4) and used for controlling start and stop of the auxiliary oil pump (31) according to an instruction of the controller (4).

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