阅读说明：本技术 一种船用双燃料柴油机的低压油增压系统 (Low-pressure oil pressurization system of marine dual-fuel diesel engine ) 是由 沈豪帅 于 2021-06-16 设计创作，主要内容包括：一种船用双燃料柴油机的低压油增压系统,包括括透气罐、循环泵、透气装置、循环泵出口阀、透气罐节流孔板、排气阀驱动执行器、燃气适配块、液压油总管、透气管和液压油管；液压油进入透气罐,从液压油中分离出空气,空气经过透气罐节流孔板进入透气管,透气后的液压油一部分通过单向阀进入液压油总管,另一部分进入循环泵进行加压,之后经过透气装置再次进行油气分离,分离出的空气进入透气管,与来自透气罐的空气一起进入船用双燃料柴油机的内部；透气装置中经过透气的液压油通过循环泵出口阀进入液压油总管,与来自透气罐的液压油会合,进入排气阀驱动执行器和燃气适配块,完成整个系统工作。本发明油气分离效果好,占用空间小,广泛适用采用双燃料的船用低速柴油机。(A low-pressure oil pressurization system of a marine dual-fuel diesel engine comprises a gas permeable tank, a circulating pump, a gas permeable device, a circulating pump outlet valve, a gas permeable tank throttling orifice plate, an exhaust valve driving actuator, a gas adapting block, a hydraulic oil main pipe, a gas permeable pipe and a hydraulic oil pipe; hydraulic oil enters the air permeable tank, air is separated from the hydraulic oil, the air enters the air permeable pipe through the throttling hole plate of the air permeable tank, one part of the ventilated hydraulic oil enters the hydraulic oil main pipe through the one-way valve, the other part of the ventilated hydraulic oil enters the circulating pump for pressurization, then oil-gas separation is carried out again through the air permeable device, and the separated air enters the air permeable pipe and enters the interior of the marine dual-fuel diesel engine together with the air from the air permeable tank; and the hydraulic oil which passes through the ventilation in the ventilation device enters a hydraulic oil main pipe through a circulating pump outlet valve, is converged with the hydraulic oil from the ventilation tank, enters an exhaust valve to drive an actuator and a fuel gas adapting block, and finishes the work of the whole system. The invention has good oil-gas separation effect and small occupied space, and is widely suitable for the marine low-speed diesel engine adopting dual fuels.)

1. A low-pressure oil pressurization system of a marine dual-fuel diesel engine is connected with a main engine lubricating oil system of the marine dual-fuel diesel engine, and is characterized in that: the low-pressure oil pressurization system comprises a gas permeable tank, a circulating pump, a gas permeable device, a circulating pump outlet valve, a gas permeable tank throttling orifice plate, an exhaust valve driving actuator, a gas adapter block, a hydraulic oil main pipe, a gas permeable pipe and a hydraulic oil pipe;

the air permeable tank is connected with the main engine lubricating oil system and used for separating air from hydraulic oil, one end of the air permeable tank is connected into the hydraulic oil main pipe through a one-way valve, the other end of the air permeable tank is connected into the air permeable pipe through the air permeable tank throttling orifice plate, and the one-way valve is used for preventing hydraulic oil from flowing back to the air permeable tank;

the throttling orifice plate of the air permeable tank is a hydraulic oil air permeable throttling device and is used for removing air in hydraulic oil and reducing pressure loss;

the circulating pump provides power for system circulation and pressurization of hydraulic oil, the upstream of the circulating pump is connected with the gas permeable tank through a circulating pump oil inlet valve and a hydraulic oil pipe, the downstream of the circulating pump is connected with the circulating pump outlet valve, and the circulating pump oil inlet valve is a cut-off device for hydraulic oil entering the circulating pump;

the air permeable device is used for separating air from the hydraulic oil again and comprises a cyclone air permeable tank inlet valve, a cyclone air permeable tank outlet valve and a cyclone air permeable tank air permeable valve; the cyclone breathable tank inlet valve, the cyclone breathable tank and the cyclone breathable tank outlet valve are sequentially connected, the cyclone breathable tank inlet valve is connected with the downstream of the circulating pump, the cyclone breathable tank is used for separating air in hydraulic oil, one end of the cyclone breathable tank breathable valve is connected with the cyclone breathable tank, and the other end of the cyclone breathable tank breathable valve is connected into the breathable pipe and used for controlling the opening and closing of a breathable pipeline of the cyclone breathable tank;

the outlet valve of the circulating pump is a switching device of pressurized hydraulic oil, the upstream of the outlet valve of the circulating pump is respectively connected with the downstream of the circulating pump and the outlet valve of the cyclone breathable tank of the breathable device, and the downstream of the outlet valve of the circulating pump is connected to the hydraulic oil main pipe;

the air permeable pipe is an air permeable pipeline, one end of the air permeable pipe is connected with the inside of the marine dual-fuel diesel engine and is used for discharging air in hydraulic oil;

the hydraulic oil main pipe is a hydraulic oil pipeline, the upstream of the hydraulic oil main pipe is connected with the outlet valve of the circulating pump, the hydraulic oil main pipe is connected with the gas permeable tank through the one-way valve, and the downstream of the hydraulic oil main pipe is connected with the exhaust valve driving actuator and the gas adapting block;

the exhaust valve driving actuator controls the opening and closing of the exhaust valve through hydraulic oil;

the gas adaptation piece is pressure control assembly, controls opening and closing of gas injection valve through hydraulic oil.

Hydraulic oil of the main engine lubricating oil system enters the air permeable tank for ventilation, air is separated from the hydraulic oil, the air enters the air permeable pipe through the air permeable tank throttling orifice plate, one part of the hydraulic oil from the air permeable tank directly enters the hydraulic oil header pipe through the one-way valve, and the other part of the hydraulic oil enters the circulating pump through the circulating pump oil inlet valve; the hydraulic oil pressurized by the circulating pump enters the ventilation device, the air is separated from the hydraulic oil again in the cyclone ventilation tank, and the separated air enters the ventilation pipe through the ventilation valve of the cyclone ventilation tank and enters the inside of the marine dual-fuel diesel engine together with the air from the ventilation tank; and the ventilated hydraulic oil in the cyclone ventilating tank enters the hydraulic oil main pipe through the outlet valve of the circulating pump, meets the ventilated hydraulic oil passing through the ventilating tank, enters the exhaust valve driving actuator to control the opening and closing of the exhaust valve, and simultaneously enters the gas adapting block to control the opening and closing of the gas injection valve, so that the work of the whole system is completed.

2. The low pressure oil pressurization system of marine dual fuel diesel engine as set forth in claim 1, characterized in that: the low-pressure oil pressurization system further comprises a hydraulic oil main pipe orifice plate which is a hydraulic oil ventilation throttling device and is used for performing gas-liquid separation on hydraulic oil in the hydraulic oil main pipe again and reducing pressure loss, one end of the hydraulic oil main pipe orifice plate is connected with the hydraulic oil main pipe, and the other end of the hydraulic oil main pipe orifice plate is connected with the ventilation pipe.

3. The low pressure oil pressurization system of marine dual fuel diesel engine as set forth in claim 1, characterized in that: a pump front pressure sensor for detecting a hydraulic oil pump front pressure value and a pressure switch for closing the circulating pump are arranged between the circulating pump and the circulating pump oil inlet valve, a pump rear pressure sensor for detecting a hydraulic oil pump rear pressure value and a pressure gauge for observing the hydraulic oil pump rear pressure value are arranged between the circulating pump and the cyclone breathable tank inlet valve, and the pump front pressure sensor, the pump rear pressure sensor, the pressure gauge and the pressure switch are connected with a host remote control system; when the pressure value before the hydraulic oil pump is less than 0.5bar, the pressure switch closes the circulating pump and gives an alarm to prevent the circulating pump from being abraded due to lack of lubrication.

4. The low pressure oil pressurization system of the marine dual fuel diesel engine according to claim 1 or 3, characterized in that: the circulating pump provides 4-7 bar of pressure.

5. The low pressure oil pressurization system of marine dual fuel diesel engine as set forth in claim 1, characterized in that: the number of the ventilating devices is two.

6. The low pressure oil pressurization system of marine dual fuel diesel engine as set forth in claim 5, characterized in that: the two groups of ventilation devices are connected in parallel.

Technical Field

The invention relates to a lubricating oil system of a marine diesel engine, in particular to a low-pressure oil pressurization system of a marine dual-fuel diesel engine, and belongs to the technical field of diesel engines.

Background

At present, the emission requirements of the marine low-speed diesel engine are more and more strict, and the marine low-speed diesel engine is developed into a gas-fuel dual-fuel mode from a traditional mode of taking diesel oil as fuel. In the gas operating mode, the marine diesel engine does not have the same demand for hydraulic oil as in the conventional fuel mode. Therefore, a hydraulic oil pipeline system is required to be added separately to drive a gas injection valve on the main machine and supplement the hydraulic oil under pressure.

Disclosure of Invention

The invention aims to solve the arrangement problem of a low-pressure oil pressurization system of a marine low-speed diesel engine in a dual-fuel mode, provides the low-pressure oil pressurization system of the marine dual-fuel diesel engine, gives consideration to the requirements of using two fuels, and achieves the effects of small occupied space and wide application range.

The purpose of the invention is realized by the following technical scheme:

a low-pressure oil pressurization system of a marine dual-fuel diesel engine is connected with a main engine lubricating oil system of the marine dual-fuel diesel engine, and is characterized in that: the low-pressure oil pressurization system comprises a gas permeable tank, a circulating pump, a gas permeable device, a circulating pump outlet valve, a gas permeable tank throttling orifice plate, an exhaust valve driving actuator, a gas adapter block, a hydraulic oil main pipe, a gas permeable pipe and a hydraulic oil pipe;

the air permeable tank is connected with the main engine lubricating oil system and used for separating air from hydraulic oil, one end of the air permeable tank is connected into the hydraulic oil main pipe through a one-way valve, the other end of the air permeable tank is connected into the air permeable pipe through the air permeable tank throttling orifice plate, and the one-way valve is used for preventing hydraulic oil from flowing back to the air permeable tank;

the throttling orifice plate of the air permeable tank is a hydraulic oil air permeable throttling device and is used for removing air in hydraulic oil and reducing pressure loss;

the circulating pump provides power for system circulation and pressurization of hydraulic oil, the upstream of the circulating pump is connected with the gas permeable tank through a circulating pump oil inlet valve and a hydraulic oil pipe, the downstream of the circulating pump is connected with the circulating pump outlet valve, and the circulating pump oil inlet valve is a cut-off device for hydraulic oil entering the circulating pump;

the air permeable device is used for separating air from the hydraulic oil again and comprises a cyclone air permeable tank inlet valve, a cyclone air permeable tank outlet valve and a cyclone air permeable tank air permeable valve; the cyclone breathable tank inlet valve, the cyclone breathable tank and the cyclone breathable tank outlet valve are sequentially connected, the cyclone breathable tank inlet valve is connected with the downstream of the circulating pump, the cyclone breathable tank is used for separating air in hydraulic oil, one end of the cyclone breathable tank breathable valve is connected with the cyclone breathable tank, and the other end of the cyclone breathable tank breathable valve is connected into the breathable pipe and used for controlling the opening and closing of a breathable pipeline of the cyclone breathable tank;

the outlet valve of the circulating pump is a switching device of pressurized hydraulic oil, the upstream of the outlet valve of the circulating pump is respectively connected with the downstream of the circulating pump and the outlet valve of the cyclone breathable tank of the breathable device, and the downstream of the outlet valve of the circulating pump is connected to the hydraulic oil main pipe;

the air permeable pipe is an air permeable pipeline, one end of the air permeable pipe is connected with the inside of the marine dual-fuel diesel engine and is used for discharging air in hydraulic oil;

the hydraulic oil main pipe is a hydraulic oil pipeline, the upstream of the hydraulic oil main pipe is connected with the outlet valve of the circulating pump, the hydraulic oil main pipe is connected with the gas permeable tank through the one-way valve, and the downstream of the hydraulic oil main pipe is connected with the exhaust valve driving actuator and the gas adapting block;

the exhaust valve driving actuator controls the opening and closing of the exhaust valve through hydraulic oil;

the gas adaptation piece is pressure control assembly, controls opening and closing of gas injection valve through hydraulic oil.

Hydraulic oil of the main engine lubricating oil system enters the air permeable tank for ventilation, air is separated from the hydraulic oil, the air enters the air permeable pipe through the air permeable tank throttling orifice plate, one part of the hydraulic oil from the air permeable tank directly enters the hydraulic oil header pipe through the one-way valve, and the other part of the hydraulic oil enters the circulating pump through the circulating pump oil inlet valve; the hydraulic oil pressurized by the circulating pump enters the ventilation device, the air is separated from the hydraulic oil again in the cyclone ventilation tank, and the separated air enters the ventilation pipe through the ventilation valve of the cyclone ventilation tank and enters the inside of the marine dual-fuel diesel engine together with the air from the ventilation tank; and the ventilated hydraulic oil in the cyclone ventilating tank enters the hydraulic oil main pipe through the outlet valve of the circulating pump, meets the ventilated hydraulic oil passing through the ventilating tank, enters the exhaust valve driving actuator to control the opening and closing of the exhaust valve, and simultaneously enters the gas adapting block to control the opening and closing of the gas injection valve, so that the work of the whole system is completed.

As a further improvement, the low-pressure oil pressurization system further comprises a hydraulic oil main pipe orifice plate, the hydraulic oil main pipe orifice plate is a hydraulic oil ventilation throttling device and is used for performing gas-liquid separation on hydraulic oil in the hydraulic oil main pipe again and reducing pressure loss, one end of the hydraulic oil main pipe orifice plate is connected with the hydraulic oil main pipe, and the other end of the hydraulic oil main pipe orifice plate is connected with the ventilation pipe.

As a further improvement, a pump front pressure sensor for detecting a hydraulic oil pump front pressure value and a pressure switch for closing the circulating pump are arranged between the circulating pump and the circulating pump oil inlet valve, a pump rear pressure sensor for detecting a hydraulic oil pump rear pressure value and a pressure gauge for observing the hydraulic oil pump rear pressure value are arranged between the circulating pump and the cyclone breathable tank inlet valve, and the pump front pressure sensor, the pump rear pressure sensor, the pressure gauge and the pressure switch are connected with a host remote control system; when the pressure value before the hydraulic oil pump is less than 0.5bar, the pressure switch closes the circulating pump and gives an alarm to prevent the circulating pump from being abraded due to lack of lubrication.

As a further improvement, the circulating pump provides a pressure of 4-7 bar.

As a further improvement, the number of the ventilating devices is two.

As a further improvement, the two sets of ventilation devices are connected in parallel.

Compared with the traditional hydraulic oil system of the marine low-speed diesel engine, the hydraulic oil system has the beneficial effects that:

1) the arrangement space is small, the device is integrated on the host, the control of the host is convenient, and the arrangement space of the cabin equipment is greatly reduced.

2) The application range is wide, for the dual-fuel host, the system can be adopted in a fuel mode or a gas mode, and the system has the advantage of wide application range.

3) The oil-gas separation effect is good, the invention is provided with the gas permeable tank, the gas permeable device and the hydraulic oil main pipe throttling orifice plate, and the gas permeable treatment of three times of oil-gas separation is carried out on the hydraulic oil in sequence, so that the gas permeable effect is greatly improved.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention.

In the figure, the position of the upper end of the main shaft,

1-ventilating tank, 2-circulating pump inlet valve, 3-circulating pump, 4-whirlwind ventilating tank inlet valve, 5-whirlwind ventilating tank, 6-whirlwind ventilating tank outlet valve, 7-whirlwind ventilating tank ventilating valve, 8-check valve, 9-circulating pump outlet valve, 10-hydraulic oil main throttle orifice plate, 11-ventilating tank throttle orifice plate, 12-exhaust valve driving actuator, 13-gas adaptation block, 14-ventilating pipe, 15-hydraulic oil pipe, 16-pressure sensor before the pump, 17-pressure sensor after the pump, 18-manometer, 19-pressure switch.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided for clear understanding of the structure and operation of the present invention, and is not intended to limit the scope of the present invention.

Referring to fig. 1, the low-pressure oil pressurization system of the marine dual-fuel diesel engine includes a gas permeable tank 1, a circulating pump oil inlet valve 2, a circulating pump 3, a cyclone gas permeable tank inlet valve 4, a cyclone gas permeable tank 5, a cyclone gas permeable tank outlet valve 6, a cyclone gas permeable tank vent valve 7, a check valve 8, a circulating pump outlet valve 9, a hydraulic oil main pipe orifice plate 10, a gas permeable tank orifice plate 11, an exhaust valve driving actuator 12, a gas adapting block 13, a gas permeable pipe 14, a hydraulic oil pipe 15, a pre-pump pressure sensor 16, a post-pump pressure sensor 17, a pressure gauge 18, and a pressure switch 19.

The air permeable tank 1 is an air permeable safety control device of a low-pressure oil system of the diesel engine, and is respectively connected with the air permeable pipe 14 and the hydraulic oil pipe 15 to separate air in hydraulic oil in the air permeable tank.

The circulating pump oil inlet valve 2 is connected with the hydraulic oil pipe 15 and the pressure sensor 16 in front of the pump, and is used for opening and closing an inlet of hydraulic oil, so that subsequent work such as maintenance is facilitated.

The circulating pump 3 is used for quickly supplementing pressure to the hydraulic oil in the whole system and is connected with the pressure switch 19 and the pressure gauge 18.

The cyclone gas permeable tank inlet valve 4 is connected to the cyclone gas permeable tank 5 and the pump rear pressure sensor 17 and used for controlling hydraulic oil to enter the cyclone gas permeable tank 5, so that subsequent work such as maintenance is facilitated.

The cyclone air-permeable tank 5 is connected with the cyclone air-permeable tank inlet valve 4 and the cyclone air-permeable tank outlet valve 6, air is removed for hydraulic oil entering the diesel engine, effective operation of hydraulic parts of the diesel engine is guaranteed, and the cyclone air-permeable valve 5 adopts two groups of structures, so that air can be removed more effectively.

The cyclone breathable tank outlet valve 6 is connected with the circulating pump outlet valve 9 and the cyclone breathable tank 5 and used for controlling hydraulic oil to flow out of the cyclone breathable tank 5, so that subsequent work such as maintenance is facilitated.

The cyclone gas permeable tank ventilation valve 7 is connected with the cyclone gas permeable tank 5 and the inside of the diesel engine to control the opening and closing of the ventilation pipeline of the cyclone gas permeable tank 5.

The one-way valve 8 is connected with the air permeable tank 1 and the exhaust valve driving actuator 12, so that hydraulic oil is ensured to enter the exhaust valve for driving, and is prevented from flowing back into the air permeable tank.

And the circulating pump outlet valve 9 is connected with the circulating pump 3, the exhaust valve driving actuator 12 and the gas adapting block 13, so that the hydraulic oil is controlled to enter and exit, and the disassembly, assembly and maintenance work is facilitated.

The hydraulic oil main pipe orifice plate 10 is connected with the vent pipe 14 and the hydraulic oil pipe 15, so that air in hydraulic oil is removed, and pressure loss is reduced.

The air permeable tank throttling pore plate 11 is connected with the air permeable pipe 14 and the air permeable tank 1, so that air in hydraulic oil is removed, and pressure loss is reduced.

The exhaust valve driving actuator 12 is connected with the hydraulic oil pipe 15 and controls the opening and closing of the exhaust valve through hydraulic oil.

The gas adapter block 13 is connected with the hydraulic oil pipe 15 and continuously props against a gas injection valve switch through hydraulic oil.

The vent pipe 14 is connected with the inside of the diesel engine and the hydraulic oil pipe, and air is discharged from hydraulic oil through the vent pipe.

The hydraulic oil pipe 15 is connected with the gas permeable tank 1 and the circulating pump oil inlet valve 2, and hydraulic oil enters the system through a pipeline.

The pre-pump pressure sensor 16 and the post-pump pressure sensor 17 are connected to the circulating pump 3 to detect the pressure conditions before and after the pump.

The pressure gauge 18 is connected with the circulating pump 3 and used for observing the pressure value after the pump.

The pressure switch 19 is connected with the circulating pump 3 and the hydraulic oil pipe 15, and when the pressure entering the circulating pump 3 is less than 0.5bar, an alarm is given and the circulating pump 3 is closed, so that the circulating pump 3 is prevented from being abraded due to lack of lubrication.

The working principle of the low-pressure oil pressurization system of the marine dual-fuel diesel engine is as follows:

hydraulic oil is introduced from a main engine lubricating oil system, ventilation is carried out through the air permeable tank 1, air is separated from the hydraulic oil, and the air enters the diesel engine through the air permeable tank throttling pore plate 11 and the air permeable pipe 14. The throttling orifice plate 11 of the air permeable tank can prevent pressure from being seriously lost and plays a throttling role. After the hydraulic oil comes out of the air-permeable tank 1, a part of the hydraulic oil directly enters the exhaust valve through the hydraulic oil pipe 15 and the one-way valve 8 to drive the actuator 12, so as to control the opening and closing of the exhaust valve; hydraulic pressure oil pipe 15 and circulating pump inlet valve 2 are passed through to another part, and circulating pump inlet valve 2 is normally opened, makes hydraulic oil get into circulating pump 3, and circulating pump 3 provides 4 ~ 7bar pressure, arranges preceding pressure sensor 16 of pump and pressure switch 19 between circulating pump 3 and the circulating pump inlet valve 2, and when pressure is less than 0.5bar, pressure switch 19 is opened, and circulating pump 3 stops, prevents that circulating pump 3 from playing the effect of protection circulating pump owing to lack lubricated wearing and tearing. The pressure condition of the hydraulic oil is monitored by the hydraulic oil pressurized by the circulating pump 3 through a pressure gauge 18 and a post-pump pressure sensor 17; the pressurized hydraulic oil enters two sets of ventilating devices to separate air from the hydraulic oil again, and the two sets of separating devices respectively consist of a cyclone ventilating tank inlet valve 4, a cyclone ventilating tank 5, a cyclone ventilating tank outlet valve 6, a cyclone ventilating tank ventilating valve 7 and a ventilating pipe 14, so that the air is effectively removed, a double-safety effect is achieved, and the air in the hydraulic oil is avoided. After the ventilated hydraulic oil meets a part of hydraulic oil passing through the ventilation tank 1, the hydraulic oil is exhausted again through the hydraulic oil main pipe throttling orifice plate 10 and the ventilation pipe 14 on the main pipe, and then the hydraulic oil enters the exhaust valve driving actuator 12 and the gas adapting block 13 together to control the operation of the exhaust valve and the gas injection valve. After the fuel gas distribution block 13 enters the fuel gas injection valve, certain hydraulic oil needs to be consumed, and the device mainly functions to quickly supplement the hydraulic oil to the fuel gas injection valve so that the main machine can continuously and stably operate.

The specific working process of the invention is as follows:

when the diesel engine runs, hydraulic oil is introduced from a main engine lubricating oil system, ventilation is carried out through the air permeable tank 1, air is separated from the hydraulic oil, and the air enters the diesel engine through the air permeable tank throttling orifice plate 11 and the air permeable pipe 14. After the hydraulic oil comes out of the air-permeable tank 1, a part of the hydraulic oil directly enters the exhaust valve through the hydraulic oil pipe 15 and the one-way valve 8 to drive the actuator 12, so as to control the opening and closing of the exhaust valve; the other part is normally opened through a hydraulic oil pipe 15 and a circulating pump oil inlet valve 2, so that hydraulic oil enters a circulating pump 3. The pressure sensor 16 before the pump, the pressure sensor 17 after the pump, the pressure gauge 18 and the pressure switch 19 are connected with a host remote control system to protect the normal operation of the circulating pump 3. After the circulating pump 3 is pressurized, the cyclone gas permeable tank inlet valve 4, the cyclone gas permeable tank outlet valve 6 and the cyclone gas permeable tank vent valve 7 are all opened, hydraulic oil enters the cyclone gas permeable tank vent valve 7, the circulating pump outlet valve 9 is opened, the ventilated hydraulic oil and the ventilated hydraulic oil flowing into the main pipe converge, then the hydraulic oil enters the gas adapting block 13 and the exhaust valve driving actuator 12 after being ventilated through the hydraulic oil main pipe throttling pore plate 10, and the exhaust valve is opened or closed, so that the whole system works.

The above description is only a preferred embodiment of the present invention, and it should be noted that various equivalent modifications, changes and adaptations made by those skilled in the art according to the present application shall be considered to be the scope of the present invention.