阅读说明：本技术 一种二冲程柴油机低负荷吸入空气的压力调节系统及船舶 (Pressure regulating system for low-load air suction of two-stroke diesel engine and ship ) 是由 吕佳 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种二冲程柴油机低负荷吸入空气的压力调节系统及船舶。该二冲程柴油机低负荷吸入空气的压力调节系统,扫气箱与柴油机主机连接,废气进管和废气出管分别与增压器连接,舱内空气进管、舱内空气出管均与增压器连接,舱内空气出管通过第一阀门与扫气箱连通,舱内空气经过舱内空气进管进入增压器,从增压器依次经过舱内空气出管和第一阀门进入扫气箱,空气压缩机的进气端与舱外空气进管连接,空气压缩机的出气端与稳压罐连接,稳压罐与连接管道连通,连接管道通过第二阀门与扫气箱连通。该二冲程柴油机低负荷吸入空气的压力调节系统能保证柴油机主机吸入的气体的压力足够大,减少柴油机的油耗。(The invention discloses a pressure regulating system for low-load air suction of a two-stroke diesel engine and a ship. This pressure governing system of two-stroke diesel engine low-load inhaled air, the scavenging box is connected with the diesel engine host computer, waste gas advances the pipe and the waste gas exit tube is connected with the booster respectively, the under-deck air advances the pipe, the under-deck air exit tube all is connected with the booster, the under-deck air goes out the pipe and communicates through first valve and scavenging box, the under-deck air advances the pipe through the under-deck air and gets into the booster, from the booster in proper order through under-deck air exit tube and first valve entering scavenging box, air compressor's inlet end and the outboard air advance union coupling, air compressor's the end of giving vent to anger is connected with surge tank, surge tank and connecting tube intercommunication, the connecting tube passes through second valve and scavenging box intercommunication. The pressure regulating system for the two-stroke diesel engine low-load air suction can ensure that the pressure of air sucked by the main engine of the diesel engine is large enough, and the oil consumption of the diesel engine is reduced.)

1. A two-stroke diesel engine low load intake air pressure regulation system comprising:

a diesel engine main unit (1);

the scavenging box (2), the scavenging box (2) is connected with the diesel engine main engine (1);

the exhaust gas purification device comprises a supercharger (3), and an exhaust gas inlet pipe (15) and an exhaust gas outlet pipe (16) which are respectively connected with the supercharger (3), wherein the exhaust gas enters the supercharger (3) through the exhaust gas inlet pipe (15) and is discharged from the supercharger (3) through the exhaust gas outlet pipe (16);

the device comprises an indoor air inlet pipe (17), an indoor air outlet pipe (18) and a first valve (6), wherein the indoor air inlet pipe (17) and the indoor air outlet pipe (18) are connected with the supercharger (3), the indoor air outlet pipe (18) is communicated with the scavenging box (2) through the first valve (6), indoor air enters the supercharger (3) through the indoor air inlet pipe (17), and enters the scavenging box (2) from the supercharger (3) through the indoor air outlet pipe (18) and the first valve (6) in sequence;

the device comprises an outboard air inlet pipe (19), a connecting pipeline (20), an air compressor (4), a surge tank (5) and a second valve (7), wherein the air inlet end of the air compressor (4) is connected with the outboard air inlet pipe (19), the air outlet end of the air compressor (4) is connected with the surge tank (5), the surge tank (5) is communicated with the connecting pipeline (20), and the connecting pipeline (20) is communicated with the scavenging box (2) through the second valve (7).

2. A pressure regulating system for low load intake air of a two-stroke diesel engine according to claim 1, characterized in that it further comprises a pressure regulating valve (8), said pressure regulating valve (8) being arranged in said connecting duct (20).

3. The system for pressure regulation of intake air with low load of two-stroke diesel engine according to claim 2, characterized in that it further comprises a first pressure sensor (12), said first pressure sensor (12) being arranged in said connecting duct (20) and between said pressure regulating valve (8) and said second valve (7).

4. A pressure regulating system for low load intake air of a two-stroke diesel engine as claimed in claim 1, characterized by further comprising a first bypass valve (9), said exhaust gas inlet duct (15) communicating with said exhaust gas outlet duct (16) through said first bypass valve (9).

5. A pressure regulating system for low load intake air of a two-stroke diesel engine according to claim 1, characterized in that it further comprises a second bypass valve (10), said cabin air inlet duct (17) communicating with said cabin air outlet duct (18) through said second bypass valve (10).

6. The system for pressure regulation of intake air with low load of a two-stroke diesel engine according to claim 5, characterized in that it further comprises a second pressure sensor (11), said second pressure sensor (11) being arranged at said cabin air outlet duct (18) and between the connection of said cabin air outlet duct (18) and said second bypass valve (10) and said first valve (6).

7. A pressure regulation system for low load intake air of a two-stroke diesel engine according to claim 1, characterized by further comprising a third pressure sensor (13), said third pressure sensor (13) being arranged at said surge tank (5).

8. A pressure regulation system for low load intake air of a two-stroke diesel engine according to claim 1, characterized in that it further comprises a fourth pressure sensor (14), said fourth pressure sensor (14) being arranged at said scavenging air box (2).

9. A pressure regulating system for low load intake air of a two-stroke diesel engine according to claim 1, characterized in that said first valve (6) and said second valve (7) are electrically operated butterfly valves.

10. A marine vessel comprising a two-stroke diesel low load intake air pressure regulation system as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of ships, in particular to a pressure regulating system for low-load air suction of a two-stroke diesel engine and a ship.

Background

In order to achieve the purpose of fully utilizing the energy of exhaust gas, the heat of the exhaust gas can be used for providing energy for an exhaust gas turbocharger of a general two-stroke diesel engine, the exhaust gas turbocharger boosts the air, then conveys the air to a scavenging box, and then is sucked by a main engine of the diesel engine through the scavenging box. When the load of the diesel engine is too low, the heat of the generated waste gas is too low, so that the efficiency of the waste gas turbocharger is too low, and the pressure of the air entering the scavenging box cannot reach the ideal scavenging pressure.

Disclosure of Invention

The invention aims to provide a pressure regulating system for low-load air suction of a two-stroke diesel engine and a ship, and aims to solve the problems that the pressure of air sucked into a main engine of the diesel engine is insufficient and the oil consumption is increased when the main engine of the diesel engine is low-load because an air blower is adopted to pressurize the air entering the main engine of the diesel engine.

In order to achieve the purpose, the invention adopts the following technical scheme:

a two-stroke diesel engine low load intake air pressure regulation system comprising:

a diesel engine host;

the scavenging box is connected with the diesel engine main machine;

the exhaust gas enters the supercharger through the exhaust gas inlet pipe and is discharged from the supercharger through the exhaust gas outlet pipe;

the device comprises an indoor air inlet pipe, an indoor air outlet pipe and a first valve, wherein the indoor air inlet pipe and the indoor air outlet pipe are connected with a supercharger, the indoor air outlet pipe is communicated with the scavenging box through the first valve, indoor air enters the supercharger through the indoor air inlet pipe, and enters the scavenging box from the supercharger through the indoor air outlet pipe and the first valve in sequence;

the air-conditioning system comprises an outdoor air inlet pipe, a connecting pipeline, an air compressor, a pressure stabilizing tank and a second valve, wherein the air inlet end of the air compressor is connected with the outdoor air inlet pipe, the air outlet end of the air compressor is connected with the pressure stabilizing tank, the pressure stabilizing tank is communicated with the connecting pipeline, and the connecting pipeline is communicated with the scavenging box through the second valve.

As a preferable scheme of the pressure regulating system for low-load intake air of the two-stroke diesel engine, the system further comprises a pressure regulating valve, and the pressure regulating valve is arranged on the connecting pipeline.

As a preferable scheme of the pressure regulating system for low-load intake air of the two-stroke diesel engine, the system further comprises a first pressure sensor, and the first pressure sensor is arranged on the connecting pipeline and is positioned between the pressure regulating valve and the second valve.

As a preferable scheme of the pressure regulating system for low-load intake air of the two-stroke diesel engine, the system further comprises a first bypass valve, and the exhaust gas inlet pipe is communicated with the exhaust gas outlet pipe through the first bypass valve.

As a preferable mode of the pressure regulating system for low-load intake air of the two-stroke diesel engine, the system further comprises a second bypass valve, and the cabin air inlet pipe is communicated with the cabin air outlet pipe through the second bypass valve.

As a preferable scheme of the pressure regulating system for low-load intake air of the two-stroke diesel engine, the system further comprises a second pressure sensor, and the second pressure sensor is arranged on the cabin air outlet pipe and is located between the connection position of the cabin air outlet pipe and the second bypass valve and the first valve.

As a preferable scheme of the pressure regulating system for low-load intake air of the two-stroke diesel engine, the system further comprises a third pressure sensor, and the third pressure sensor is arranged on the surge tank.

As a preferable scheme of the pressure regulating system for low-load intake air of the two-stroke diesel engine, the system further comprises a fourth pressure sensor, and the fourth pressure sensor is arranged in the scavenging box.

As a preferable mode of the pressure regulating system for low load intake air of the two-stroke diesel engine, the first valve and the second valve are electric butterfly valves.

A ship comprises the two-stroke diesel engine low-load air suction pressure regulating system.

The invention has the beneficial effects that: the invention provides a pressure regulating system for low-load air suction of a two-stroke diesel engine and a ship. When the load of the diesel engine is too low, the exhaust gas quantity of the diesel engine is small, the exhaust gas heat is low, when enough energy cannot be provided for the supercharger, the efficiency of the supercharger is too low, the pressure of air sucked by the diesel engine host is too low, at the moment, the first valve is closed, the second valve is opened, the gas in the pressure stabilizing tank enters the diesel engine host through the connecting pipeline, the gas in the pressure stabilizing tank is air pressurized by the air compressor, the pressure of the gas sucked by the diesel engine host can be ensured to be large enough, the large enough compression pressure and combustion pressure are obtained, and the oil consumption of the diesel engine is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a pressure regulation system for low load intake air of a two-stroke diesel engine according to an embodiment of the present invention.

In the figure:

1. a diesel engine host; 2. a scavenging air box; 3. a supercharger; 4. an air compressor; 5. a surge tank; 6. a first valve; 7. a second valve; 8. a pressure regulating valve; 9. a first bypass valve; 10. a second bypass valve; 11. a second pressure sensor; 12. a first pressure sensor; 13. a third pressure sensor; 14. a fourth pressure sensor; 15. an exhaust gas inlet pipe; 16. an exhaust gas outlet pipe; 17. an air inlet pipe in the cabin; 18. an air outlet pipe in the cabin; 19. an outboard air intake duct; 20. and connecting the pipelines.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The invention provides a pressure regulating system for low-load air suction of a two-stroke diesel engine and a ship.

As shown in fig. 1, the pressure regulating system for low-load intake air of a two-stroke diesel engine comprises a diesel engine main body 1, a scavenging tank 2, a supercharger 3, an exhaust gas inlet pipe 15, an exhaust gas outlet pipe 16, an in-cabin air inlet pipe 17, an in-cabin air outlet pipe 18, a first valve 6, an out-cabin air inlet pipe 19, a connecting pipeline 20, an air compressor 4, a surge tank 5 and a second valve 7, wherein the scavenging tank 2 is connected with the diesel engine main body 1, the exhaust gas inlet pipe 15 and the exhaust gas outlet pipe 16 are respectively connected with the supercharger 3, exhaust gas of the diesel engine enters the supercharger 3 through the exhaust gas inlet pipe 15 and is discharged out of a cabin from the supercharger 3 through the exhaust gas outlet pipe 16, and heat of the exhaust gas of the diesel engine provides energy for the operation of the supercharger 3. The air inlet pipe 17 in the cabin and the air outlet pipe 18 in the cabin are both connected with the supercharger 3, the air outlet pipe 18 in the cabin is communicated with the scavenging box 2 through the first valve 6, air in the cabin enters the supercharger 3 through the air inlet pipe 17 in the cabin, the supercharger 3 pressurizes the air and then enters the scavenging box 2 through the air outlet pipe 18 in the cabin and the first valve 6, and the first valve 6 can control whether the air outlet pipe 18 in the cabin is communicated with the scavenging box 2. The air inlet end of the air compressor 4 is connected with an outdoor air inlet pipe 19, the air outlet end of the air compressor 4 is connected with a pressure stabilizing tank 5, the pressure stabilizing tank 5 is communicated with a connecting pipeline 20, the connecting pipeline 20 is communicated with the scavenging tank 2 through a second valve 7, and the second valve 7 can control whether the connecting pipeline 20 is communicated with the scavenging tank 2. Air outside the cabin is sucked by the air compressor 4, then is pressurized, is conveyed into the pressure stabilizing tank 5 and is stored in the pressure stabilizing tank 5, and when the second valve 7 is opened, the air in the pressure stabilizing tank 5 enters the scavenging box 2 through the connecting pipeline 20. When the load of the diesel engine is too low, the exhaust gas quantity of the diesel engine is small, the exhaust gas heat quantity is low, and sufficient energy cannot be provided for the supercharger 3, the efficiency of the supercharger 3 is too low, the pressure of air sucked by the diesel engine main unit 1 is too low, at the moment, the first valve 6 is closed, the second valve 7 is opened, the gas in the surge tank 5 enters the diesel engine main unit 1 through the connecting pipeline 20, the gas in the surge tank 5 is air pressurized by the air compressor 4, the pressure of the gas sucked by the diesel engine main unit 1 can be ensured to be sufficiently large, sufficiently large compression pressure and combustion pressure are obtained, and the oil consumption of the diesel engine is reduced.

Optionally, a pressure regulating valve 8 is further included, and the pressure regulating valve 8 is disposed in the connecting pipe 20. The pressure regulating valve 8 is positioned between the surge tank 5 and the second valve 7, and the pressure regulating valve 8 can regulate the pressure of the gas entering the scavenging tank 2, so that the pressure of the air sucked by the diesel engine main unit 1 meets the requirement.

Optionally, a first pressure sensor 12 is further included, the first pressure sensor 12 being disposed in the connecting pipe 20 and between the pressure regulating valve 8 and the second valve 7. The first pressure sensor 12 can monitor the pressure of the gas that is about to enter the scavenging gas box 2, and if the gas pressure is not satisfactory, the gas pressure can be adjusted to an appropriate pressure value by the pressure regulating valve 8.

Optionally, a first bypass valve 9 is further included, and the waste gas inlet pipe 15 is communicated with the waste gas outlet pipe 16 through the first bypass valve 9. When the first valve 6 is opened and the second valve 7 is closed, the first bypass valve 9 is in a closed state, and the exhaust gas passes through the supercharger 3; when the first valve 6 is closed and the second valve 7 is opened, the first bypass valve 9 is opened, and the exhaust gas directly enters the exhaust gas outlet pipe 16 from the exhaust gas inlet pipe 15 without passing through the supercharger 3. At this time, the gas sucked into the diesel engine main unit 1 is the gas output from the surge tank 5, and the exhaust gas does not pass through the supercharger 3, so that the energy loss of the supercharger 3 is not caused.

Optionally, a second bypass valve 10 is further included, and an in-cabin air inlet duct 17 communicates with an in-cabin air outlet duct 18 through the second bypass valve 10. When the first valve 6 is closed, the state that the second valve 7 is opened is switched to the state that the first valve 6 is opened, and before the state that the second valve 7 is closed, the second bypass valve 10 is opened to adjust the pressure of the gas to enter the diesel engine main machine 1, so that the pressure of the gas entering the diesel engine main machine 1 is stable before and after the switching of the opening and closing states of the first valve 6 and the second valve 7, and the stable work of the diesel engine main machine 1 is ensured. At other times, the second bypass valve 10 is in the closed state.

Optionally, a second pressure sensor 11 is further included, and the second pressure sensor 11 is disposed at the cabin air outlet pipe 18 and between the first valve 6 and the junction of the cabin air outlet pipe 18 and the second bypass valve 10. The second pressure sensor 11 can monitor the pressure of the gas to be introduced into the diesel engine main unit 1 from the cabin air outlet pipe 18, and if the gas pressure does not meet the requirement, the gas pressure value can be adjusted by the second bypass valve 10.

Optionally, a third pressure sensor 13 is further included, and the third pressure sensor 13 is provided to the surge tank 5. The third pressure sensor 13 can monitor the pressure in the surge tank 5, and when the pressure in the surge tank 5 is insufficient, the air compressor 4 is started to perform pressurization. The surge tank 5 stores compressed air at about 5 bar.

Optionally, a fourth pressure sensor 14 is further included, and the fourth pressure sensor 14 is disposed on the scavenging air box 2. The fourth pressure sensor 14 is able to monitor the pressure in the scavenging air box 2.

Optionally, the first valve 6 and the second valve 7 are electrically operated butterfly valves. Optionally, the first and second bypass valves 9, 10 are electrically operated butterfly valves.

The invention also provides a ship which comprises the pressure regulating system for low-load air suction of the two-stroke diesel engine.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.