CN116146303A

CN116146303A - Oil supply system of marine diesel engine oil pan, diesel engine and method

Info

Publication number: CN116146303A
Application number: CN202210975073.7A
Authority: CN
Inventors: 张振胜; 张翠云; 周生伟; 张峰; 林淑彦; 房雪梅; 李兆勇; 张田田
Original assignee: China National Petroleum Corp; CNPC Jichai Power Co Ltd
Current assignee: China National Petroleum Corp; CNPC Jichai Power Co Ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2023-05-23

Abstract

The invention relates to the technical field of diesel engines, in particular to an engine oil supply system of an engine oil pan of a marine diesel engine, a diesel engine and a method, comprising the engine oil pan; an oil tank installed outside the diesel engine and higher than the oil pan; the engine oil pump is connected with the oil tank through an oil inlet pipeline and pumps engine oil to each lubricating part of the diesel engine; the oil pump and the oil pump are driven by a crankshaft main gear, are connected with the oil pan, pump the engine oil in the oil pan into the oil tank through an oil return pipeline, and the rated flow of the oil pump is larger than that of the oil pump; the overflow pipeline is connected with the oil tank and the oil pan and used for refluxing excessive engine oil in the oil tank into the oil pan; the pump quantity of the oil pump is always larger than that of the oil pump, and redundant engine oil in the oil tank flows back to the oil pan through the overflow pipeline, so that the whole engine oil system is balanced. The oil pan is internally provided with a certain amount of engine oil, so that the phenomenon of oil shortage of the oil pump can be reduced.

Description

Oil supply system of marine diesel engine oil pan, diesel engine and method

Technical Field

The invention relates to the technical field of diesel engines, in particular to an engine oil supply system of an engine oil pan of a marine diesel engine, a diesel engine and a method.

Background

The larger the ship such as fishing boat, engineering boat, etc. is made at present, the larger the power requirement on the diesel engine is. However, due to the tonnage limit of the ship, special requirements are imposed on the space size of the diesel engine, and the height size cannot be exceeded.

Wet oil pans are a common way of storing oil, typically by providing a reservoir at the bottom of the diesel engine for storing all the oil needed to lubricate the diesel engine. In a wet lubrication system, only one oil pump is provided. The oil pump sucks oil from the bottom of the oil pan and then pumps the oil to the parts of the diesel engine that need lubrication. The lubricated oil drops naturally flow back to the bottom of the diesel engine sump. Due to the self structural limitation of the wet oil pan, the diesel engine adopting the structure is high in gravity center, and the requirement of the ship on the height of the diesel engine is difficult to meet.

Compared with a wet oil pan, the dry oil pan lubrication system needs to add an additional oil pump and an additional oil tank, and the height of the diesel engine is reduced due to the fact that the oil pan at the lower end of the diesel engine only stores a small amount of engine oil (or almost no engine oil exists). The oil pump is used for pumping oil in the oil pan into the oil storage tank, and the oil pump is used for pumping the oil in the oil storage tank into the diesel engine for lubrication. The flow rate of the engine oil pumped by the engine oil pump is changed, and the engine oil flowing into the oil pan after lubrication is more and less, so that the pumping capacity of the oil pump is designed according to the maximum flow rate of the engine oil flowing into the oil pan in order to ensure that the oil pan is oilless or less.

However, when the flow of the engine oil flowing into the oil pan after lubrication is at a lower level, the pumping capacity of the oil pump is not changed, so that the oil pump is in an oil-deficient state, and the damage of the oil pump is easy to cause.

Disclosure of Invention

The invention aims to provide an engine oil supply system of an engine oil pan of a marine diesel engine, the diesel engine and a method, so as to solve the problem of oil shortage of an oil pump caused by less oil storage of a dry type engine oil pan in the prior art. In order to achieve the above object, the present invention solves the following problems by the following technical scheme:

in a first aspect, the present invention provides an oil supply system for a marine diesel oil pan, comprising:

an oil pan;

an oil tank installed outside the diesel engine and higher than the oil pan;

the engine oil pump is connected with the oil tank through an oil inlet pipeline and pumps engine oil to each lubricating part of the diesel engine;

the oil pump and the oil pump are driven by a main gear of a crankshaft, are connected with the oil pan and pump engine oil in the oil pan into the oil tank through an oil return pipeline, and the rated flow of the oil pump is larger than that of the oil pump;

and the overflow pipeline is connected with the oil tank and the oil pan and is used for refluxing excessive engine oil in the oil tank into the oil pan.

As a further technical scheme, the oil inlet pipeline is provided with a butterfly valve.

As a further technical scheme, the height of the set liquid level in the oil tank is equal to the oil inlet of the overflow pipeline.

As a further solution, the overflow line leads from the bottom of the tank.

As a further technical solution, the engine oil pre-pump further comprises a pre-oil supply pump connected with the oil tank and used for pumping engine oil to each lubricating part of the diesel engine in advance.

As a further technical scheme, the upper part of the oil tank is provided with an oil filling port, and the bottom of the oil tank is provided with a slag discharging port.

As a further technical scheme, the oil inlet pipeline, the oil return pipeline and the overflow pipeline are all provided with ball valves.

As a further technical scheme, the connection port of the oil inlet pipeline and the oil tank is positioned at the lower part of the oil inlet pipeline, and the connection port of the oil return pipeline and the oil tank is positioned at the upper part of the oil return pipeline.

In a second aspect, the present invention provides a diesel engine using the oil pan oil supply system as described in the first aspect.

In a third aspect, the present invention provides a method of operating the oil pan engine oil supply system according to the first aspect, comprising:

adding oil into the oil tank until the set liquid level is above, enabling excessive oil above the set liquid level to flow into the oil pan through an overflow pipe line until the oil in the oil pan reaches the set liquid level, and stopping adding oil into the oil tank;

the diesel engine runs, the oil pump and the oil pump are driven to run simultaneously, the oil pump continuously pumps the engine oil in the oil tank to each lubricating part, the oil pump continuously pumps the engine oil in the oil pan back to the oil tank, the excessive engine oil in the oil tank flows back to the oil pan through the overflow pipeline, the liquid level of the oil pan and the liquid level of the oil tank are kept unchanged, and the balance of the oil supply system is achieved.

The beneficial effects of the invention are as follows:

(1) The oil pump and the oil well pump are both arranged on the diesel engine and driven by the main gear 3 of the crankshaft of the diesel engine, and meanwhile, the rated flow of the oil well pump is larger than that of the oil pump, so that the synchronization and the pump difference of the two pumps can be ensured to the greatest extent, the pump quantity of the oil well pump is always larger than that of the oil pump in the range of the full working conditions of the rated rotating speed and the partial rotating speed of the diesel engine, and the excessive engine oil in the oil tank flows back to the oil pan through the overflow pipeline, so that the whole engine oil system is balanced. The oil pan is internally provided with a certain amount of engine oil, so that the phenomenon of oil shortage of the oil pump can be reduced.

(2) The oil pan has a slightly larger engine oil quantity than the engine oil quantity in the traditional dry oil pan through the high-level oil tank and the overflow function, but the oil pan is still small relative to the wet oil pan. The diesel engine lubricating oil system can meet the requirements of the diesel engine lubricating oil system under the working conditions of ship rolling, pitching, rolling and pitching, reduces the height of the diesel engine, meets the requirements of cabin space, and improves the installation adaptability and the operation reliability of the diesel engine.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It should also be understood that the drawings are for simplicity and clarity and have not necessarily been drawn to scale. The invention will now be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

FIG. 1 is a schematic diagram showing the structure of an oil supply system according to an embodiment of the present invention;

fig. 2 shows a schematic diagram of the oil supply system in an embodiment of the invention.

In the figure: 1. an oil pump; 2. an oil pump; 3. a crankshaft main gear; 4. an oil pan; 5. an oil tank; 6. an overflow line; 7. an oil feed line; 8. an oil return line; 9. butterfly valve; 10. a first ball valve; 11. a second ball valve; 12. a third ball valve; 13. a fourth ball valve; 14. a fifth ball valve; 15. a level gauge.

Detailed Description

The technical solutions in the exemplary embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Example 1

As shown in fig. 1 and 2, the present embodiment provides an oil supply system for an oil pan of a marine diesel engine, including:

an oil pan 4;

an oil tank 5 installed outside the diesel engine and higher than the oil pan 4;

the engine oil pump 2 is connected with the oil tank 5 through an oil inlet pipeline 7 and pumps engine oil to each lubricating part of the diesel engine;

the oil pump 1 and the oil pump 2 are driven by a crankshaft main gear 3 and are connected with the oil pan 4, and engine oil in the oil pan 4 is pumped into the oil tank 5 by an oil return pipeline 8, wherein the rated flow of the oil pump 1 is larger than that of the oil pump 2;

and an overflow line 6 connecting the oil tank 5 and the oil pan 4 for returning excess oil in the oil tank 5 to the oil pan 4.

The engine oil pump 2 is arranged on the diesel engine, and the gear is driven by a main gear 3 of a crank shaft of the diesel engine to pump the engine oil in the oil tank 5 to each lubrication part of the diesel engine.

The oil pump 1 is arranged on a diesel engine, the gear is driven by a main gear 3 of a crank shaft of the diesel engine, and engine oil which is lubricated and returns to an oil pan of each part is pumped back to the oil tank.

The oil pan 4 is installed at the bottom surface of the diesel engine body, and is used for collecting the engine oil for lubricating each component and storing a set amount of engine oil. A certain amount of engine oil is always kept in the oil pan, and the phenomenon of oil shortage of the oil pump 1 can be reduced.

The oil pump 2 and the oil well pump 1 are both arranged on the diesel engine and driven by the crankshaft main gear 3 of the diesel engine, meanwhile, the rated flow of the oil well pump 1 is larger than that of the oil pump 2, the synchronization and the pump difference of the two pumps can be guaranteed to the greatest extent, the pump quantity of the oil well pump is always larger than that of the oil pump in the range of the rated rotating speed and the full working condition of partial rotating speed of the diesel engine, and redundant engine oil in the oil tank flows back to the oil pan through an overflow pipeline, so that the whole engine oil system is balanced.

It will be appreciated that the oil pan 4 in this embodiment is slightly larger in oil than in a conventional dry oil pan, but still is small relative to a wet oil pan, by virtue of the overhead tank and the overflow action. The diesel engine lubricating oil system can meet the requirements of the diesel engine lubricating oil system under the working conditions of ship rolling, pitching, rolling and pitching, reduces the height of the diesel engine, meets the requirements of cabin space, and improves the installation adaptability and the operation reliability of the diesel engine.

The liquid level in the oil pan 4 is enough to be over the oil inlet of the oil pump 2, so that the oil pump is ensured not to be deficient in oil.

The oil inlet pipeline 7 is provided with a butterfly valve 9. The oil pump 2 can always have a larger pump quantity than the oil pump 1 in the full rotation speed range of the diesel engine by adjusting the opening of the butterfly valve 9.

The oil tank 5 is arranged at a height which is more than 500mm (the distance between the bottom of the oil tank and the center of the rotating shaft of the oil pump) of the diesel engine, and the distance from the bottom of the oil tank to the front end of the diesel engine is not more than 5m. The oil pump and the oil-well pump are arranged at the front end of the diesel engine and driven by the main gear 3 of the crankshaft, when the oil pump is initially designed, the rated rotation speed and the flow under the rated outlet pressure of the oil pump 2 are larger than those of the oil pump, the rated outlet pressure of the oil pump is generally selected to be 7bar, the rated outlet pressure of the oil pump is generally selected to be 3bar, and the oil pump is 5m larger than the rated flow of the oil pump in the embodiment ³ And/h. The opening of the butterfly valve 9 at the outlet of the oil tank is regulated when the diesel engine is actually used for debugging, so that the pump quantity of the oil pump is always larger than the oil pump in the full working condition range of the rated rotating speed and the partial rotating speed of the diesel engine. The pipe diameter d1 of the oil pump connecting oil return pipeline 8, the pipe diameter d2 of the oil pump connecting oil inlet pipeline 7 and the pipe diameter d3 of the overflow pipeline 6 are determined according to the pumping capacity of the oil pump.

The set liquid level in the oil tank 5 is equal to the oil inlet of the overflow pipeline 6, so that the excessive engine oil in the oil tank 5 can timely flow back to the oil pan 4 through the overflow pipeline 6. In this embodiment, the overflow line 6 leads from the bottom of the tank 5.

The oil pan 4 can be filled with oil via the oil tank 5. The oil pump 2 extracts engine oil from the oil tank 5 for the diesel engine when the diesel engine operates, the oil pump 1 is responsible for pumping the engine oil in the oil pan 4 back to the oil tank 5, the redundant engine oil in the oil tank flows back to the oil pan 4 through the overflow pipeline 6, the whole engine oil system is balanced, and the oil tank liquid level and the oil pan liquid level are basically unchanged (in an instant state, without considering engine oil consumption). In the long-time running process of the diesel engine, the liquid level of the oil pan 4 can be gradually reduced due to the consumption of engine oil, when the liquid level is reduced to the mouth of an oil suction pipe of the oil pump, the pump quantity of the oil pump can be gradually reduced, the liquid level of an oil tank is gradually reduced, and the oil tank needs to be timely replenished with oil after the low liquid level of the oil tank is alarmed.

For monitoring the liquid level, a liquid level meter 15 and a low liquid level alarm sensor are arranged, the range of the liquid level meter 15 covers the oil inlet of the overflow pipe, and the low liquid level alarm sensor is arranged at the position, about 80mm below the oil inlet of the overflow pipe.

The upper part of the oil tank 5 is provided with an oil filling port for filling engine oil, and the bottom of the oil tank 5 is provided with a slag discharging port for discharging oil slag in the oil tank.

The oil inlet line 7, the oil return line 8 and the overflow line 6 are all provided with ball valves. Meanwhile, ball valves are also arranged at the oil filling port and the slag discharging port.

The overflow pipeline 6 is provided with a first ball valve 10, the oil inlet pipeline 7 is provided with a fifth ball valve 14, the oil return pipeline 8 is provided with a fourth ball valve 13, the oil filling port is provided with a third ball valve 12, and the slag discharging port is provided with a second ball valve 11.

In this embodiment, the connection port of the oil inlet line 7 and the oil tank 5 is located at the lower portion thereof, and the connection port of the oil return line 8 and the oil tank 5 is located at the upper portion thereof.

As shown in fig. 2, the engine oil pre-lubrication system further comprises a pre-oil supply pump which is arranged beside the diesel engine, is electrically or pneumatically connected with the oil tank 5, and pumps engine oil to each lubrication part of the diesel engine in advance for pre-lubrication of each part before starting up the diesel engine and post-lubrication after stopping the engine.

The self-cleaning filter for lubricating oil is structurally arranged on a diesel engine in the prior art, and the self-cleaning filter is realized by driving a hydraulic motor to drive an internal valve plate to blow back through the pressure of lubricating oil.

The centrifugal filter is also included: is installed on a diesel engine, and an engine oil fine filter filters impurities and particles through centrifugation.

The lubricating device also comprises a pressure regulating valve and a temperature regulating valve which are arranged on the diesel engine, and the pressure and the temperature of the main oil duct are regulated to ensure good lubrication of the lubricating part. The pressure regulating valve senses the pressure of the main oil duct to regulate the leakage flow so that the pressure of the main oil duct is within a normal range. The temperature regulating valve ensures that the oil temperature is in a required range through the oil quantity flowing to the engine oil cooler.

The engine oil cooler is arranged beside the diesel engine and cools engine oil through fresh water or seawater.

The oil sludge filter is of a structure in the prior art, is arranged beside the diesel engine and is used for collecting dirty oil filtered by the lubricating oil self-cleaning filter, and efficiently filters and then returns to the oil pan.

The oil pump sucks oil from the oil tank, the oil enters the lubricating oil self-cleaning filter through the one-way valve, the pressure regulating valve and the temperature regulating valve after being pumped, a bypass is arranged in front of the one-way valve, the lubricating oil enters the centrifugal filter, the lubricating oil flows back to the oil pan after being filtered, the pressure regulating valve senses the oil pressure of the main oil passage, the pressure of the main oil passage is in a normal range through the movement of the valve core to regulate the leakage flow, an outlet of the temperature regulating valve is connected with the oil cooler through a bypass, and the temperature regulating valve is opened or closed according to a set temperature value to determine whether the lubricating oil flows through the oil cooler; and then the engine oil enters the lubricating oil self-cleaning filter, the filtered clean engine oil directly enters the engine main oil duct, and is further conveyed to each system and friction pair to be lubricated, and dirty oil filtered by the lubricating oil self-cleaning filter flows back to the oil pan after passing through the oil sludge filter.

Example 2

This embodiment provides a diesel engine using the oil supply system of the oil pan of embodiment 1.

Example 3

The present embodiment provides an operation method of the oil pan engine oil supply system according to embodiment 1, including:

adding oil into the oil tank 5 until the set liquid level is above, enabling excessive oil above the set liquid level to flow into the oil pan 4 through the overflow pipeline 6 until the oil in the oil pan 4 reaches the set liquid level, and stopping adding oil into the oil tank 5;

the diesel engine runs, the engine oil pump 2 and the oil well pump 1 are driven to run simultaneously, the engine oil pump 2 continuously pumps engine oil in the oil tank 5 to each lubricating part, the oil well pump 1 continuously pumps engine oil in the oil pan 4 back to the oil tank 5, excessive engine oil in the oil tank 5 flows back to the oil pan 4 through the overflow pipeline 6, the liquid level of the oil pan 4 and the liquid level of the oil tank 5 are kept unchanged, and the balance of an oil supply system is achieved.

Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.

Claims

1. An oil supply system for a marine diesel engine oil pan, comprising:

an oil pan;

an oil tank installed outside the diesel engine and higher than the oil pan;

2. The oil supply system of an oil pan of a marine diesel engine as set forth in claim 1, wherein a butterfly valve is provided on the oil inlet line.

3. The marine diesel sump oil supply system of claim 1, wherein the set level in the oil tank is level with the oil inlet of the overflow line.

4. A marine diesel sump oil supply system as set forth in claim 3 wherein said overflow line leads from the bottom of said tank.

5. The marine diesel sump oil supply system of claim 1, further comprising a pre-feed pump connected to the oil tank and pre-pumping oil to the individual lubrication components of the diesel engine.

6. The oil supply system of an oil pan of a marine diesel engine as set forth in claim 1, wherein the upper portion of the oil tank is provided with an oil filler, and the bottom of the oil tank is provided with a slag drain.

7. The marine diesel sump oil supply system of claim 1, wherein the oil inlet line, the oil return line, and the overflow line are each provided with ball valves.

8. The oil supply system of a marine diesel sump according to claim 1, wherein the connection port of the oil inlet line and the oil tank is located at a lower portion thereof, and the connection port of the oil return line and the oil tank is located at an upper portion thereof.

9. A diesel engine, characterized in that the oil pan engine oil supply system according to any one of claims 1 to 8 is used.

10. The method of operating an oil pan engine oil supply system according to any one of claims 1 to 8, comprising: