CN210948961U - Hydraulic oil supply device of internal combustion engine and ship with hydraulic oil supply device - Google Patents

Abstract

The utility model provides a hydraulic pressure oil supply unit of internal-combustion engine and have its boats and ships. The hydraulic oil supply device comprises a common rail pipe, a high-pressure oil pump, an oil tank, an electric pump and a mechanical pump; the internal cavity of the common rail pipe is communicated with the first pressure accumulation cavity of the oil injector; the second pressure accumulation cavity of the high-pressure oil pump is communicated with the inner cavity of the common rail pipe, and the high-pressure oil pump is used for increasing the pressure of fuel oil entering from a second oil inlet of the high-pressure oil pump and then conveying the fuel oil to the second pressure accumulation cavity; the internal space of the oil tank is provided with fuel oil, and the internal space of the oil tank is respectively communicated with a first oil return port of the oil injector, a second oil return port of the high-pressure oil pump and a third oil return port of the common rail pipe through an oil return pipeline; a first pump outlet of the electric pump is communicated with the second oil inlet, and a first pump inlet of the electric pump is communicated with the inner space of the oil tank; and a second pump outlet of the mechanical pump is communicated with the second oil inlet, and a second pump inlet of the mechanical pump is communicated with the inner space of the oil tank. Therefore, the common rail pressure can be quickly established in the common rail pipe, and the internal combustion engine can be quickly started.

Description

Hydraulic oil supply device of internal combustion engine and ship with hydraulic oil supply device

Technical Field

The utility model relates to an internal-combustion engine field generally, and more specifically relate to a hydraulic pressure oil supply unit of internal-combustion engine and have its boats and ships.

Background

Nowadays, after a mechanical fuel system of a marine diesel engine is designed and shaped, the injection pressure and the injection timing are fixed and unchanged, and the mechanical fuel system cannot be flexibly adjusted according to the change of the working condition of the diesel engine. The high-pressure common rail fuel injection system is the most advanced fuel injection system at present, and can flexibly control the fuel injection pressure and the fuel injection timing, so that the optimal combination of the oil consumption and the emission of an engine can be realized. In the high-pressure common rail fuel injection system, a high-pressure common rail pipe is used as a main part of the high-pressure common rail fuel injection system and used for storing and delivering high-pressure fuel with stable pressure for an oil injector.

The vehicle high-pressure common rail diesel engine has small pressure fluctuation in the common rail pipe due to small oil injection amount in a single cycle, and the pressure fluctuation can be absorbed by the inner cavity of the common rail pipe. Thus, the pressure fluctuation in the common rail pipe can cause negligible disturbance to the injection of the adjacent cylinder, and the common rail pipe volume of the diesel engine for vehicles can be made small.

The oil injection quantity of the high-power marine diesel engine is tens of times or even hundreds of times of that of the high-pressure common rail diesel engine for the vehicle, so that the pressure fluctuation in the common rail pipe caused by single injection of the high-power marine diesel engine is large, and the amplitude of the pressure fluctuation after being transmitted by the high-pressure oil pipe can still reach +/-250 bar or even higher. In order to reduce the magnitude of the above-mentioned pressure fluctuations of high-power marine diesel engines today, the internal cavity of the common rail is arranged to be large in order to stabilize the pressure fluctuations at the inlet end of the injector, even at the head of the injector while a first pressure accumulation chamber is arranged to stabilize the injection pressure.

Fig. 1 is a schematic diagram of a conventional hydraulic oil supply device for a high-power marine diesel engine. The hydraulic oil supply device of the high-power marine diesel engine comprises an oil injector 10, a common rail pipe 20, a high-pressure oil pump 30, an oil tank 40, an oil return pipeline 50, a mechanical pump 70, an overflow valve 21, a pipeline pressure sensor 22, an electronic control unit 24, a temperature sensor 25, a safety valve 27, a rail pressure sensor 29, a fine filter 31, a coarse filter 32 and the like.

When a conventional high-power marine diesel engine is started, a starter motor drives the crankshaft of the diesel engine to a rotational speed of about 100 rpm. At this time, the rotation speed of the mechanical pump is also about 100 rmp. The mechanical pump has low volumetric efficiency at the rotating speed, low oil supply pressure and small flow. And the fuel oil can be delivered into the common rail pipe and the high-pressure oil pipe only by overcoming the opening pressure (the opening pressure is about 1.3-1.7 bar) of a one-way valve in front of an oil metering valve on the high-pressure oil pump. And then the pressure can be built in the common rail pipe, and the oil injection of the oil injector and the successful starting of the engine can be realized.

1. When the existing hydraulic oil supply device of the high-power marine diesel engine is started, the oil supply pressure of the mechanical pump 70 is very low, and the high-pressure volume (the internal cavity of the common rail pipe, the first pressure storage cavity at the head of the oil injector, the second pressure storage cavity of the high-pressure oil pump and the high-pressure oil pipe) of the high-pressure common rail system cannot be quickly filled, so that the common rail pressure cannot be quickly established, and the diesel engine can be started for too long time or can be started successfully by multiple times.

2. The overflow valve 21 of the hydraulic oil supply device of the existing high-power marine diesel engine comprises an orifice plate and a check valve. Thus, the fuel pressure of the pipe (oil feed pipe) between the mechanical pump 70 and the high-pressure oil pump 30 is adjusted by adjusting the hole diameter of the orifice plate. And overflow bypass of redundant fuel oil of the oil inlet pipeline is realized. The combination of the orifice plate and the one-way valve can not keep the pressure of the oil inlet pipeline unchanged under all working conditions. The pressure of the oil inlet pipeline can be increased along with the increase of the rotating speed of the diesel engine, and the overflow flow of the overflow valve 21 is gradually increased. The pressure of the oil inlet pipeline is also synchronously increased (the maximum pressure is high). The oil inlet pressure (the pressure of fuel oil in an oil inlet pipeline) of the high-pressure oil pump is stable, and the opening degree of an oil mass metering valve in the high-pressure oil pump can be linearly adjusted to accurately control the oil mass entering the high-pressure oil pump. If the oil inlet pressure is unstable or the pressure fluctuation is too large, the oil inlet quantity of the high-pressure oil pump is difficult to accurately control by the oil metering valve (the opening degree of the oil metering valve needs to be continuously adjusted when the pressure is continuously changed), so that the accurate control of the common rail pressure in the inner cavity of the common rail pipe is influenced, and finally, the oil injection pressure is unstable to cause the hunting (unstable rotating speed) of the diesel engine.

3. The existing low-pressure fuel oil pipeline is complex, the positions of a pipeline pressure sensor and a temperature sensor are scattered, the position of an overflow valve is randomly arranged, the system is not compact in arrangement, and the system reliability and the maintainability are poor.

Therefore, there is a need to provide a hydraulic oil supply apparatus of an internal combustion engine and a ship having the same to at least partially solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

In order to solve the above technical problem, according to an aspect of the present invention, there is provided a hydraulic oil supply device for an internal combustion engine, the internal combustion engine including a fuel injector for spraying mist fuel oil to a combustion chamber of the internal combustion engine, the fuel injector comprising: the internal cavity of the common rail pipe is communicated with the first pressure accumulation cavity of the oil injector; the second pressure accumulation cavity of the high-pressure oil pump is communicated with the inner cavity of the common rail pipe, and the high-pressure oil pump is used for increasing the pressure of fuel oil entering from the second oil inlet of the high-pressure oil pump and then conveying the fuel oil to the second pressure accumulation cavity; the fuel oil is arranged in the inner space of the oil tank, and the inner space of the oil tank is respectively communicated with a first oil return port of the oil injector, a second oil return port of the high-pressure oil pump and a third oil return port of the common rail pipe through an oil return pipeline; the first pump inlet of the electric pump is communicated with the inner space of the oil tank; the mechanical pump, the second pump export and the second oil inlet intercommunication of mechanical pump, the interior space intercommunication of the second pump entry and the oil tank of mechanical pump.

According to the utility model discloses a hydraulic pressure oil supply unit of internal-combustion engine, when starting internal-combustion engine, can start the electric pump, in order to fill oil in advance through the electric pump, mechanical pump is in the stop condition this moment, the electric pump carries the fuel in with the oil tank to high-pressure oil pump, high-pressure oil pump carries to second pressure storage chamber after increasing fuel pressure, and like this, when starting internal-combustion engine, carry the fuel to high-pressure oil pump through the electric pump, because the fuel feeding pressure of electric pump is big, consequently, can make the fuel be full of the second pressure storage chamber fast, first pressure storage chamber, the inside cavity of common rail pipe, and high-pressure oil pipe. The common rail pressure can be quickly established in the common rail pipe, the starting of the internal combustion engine is quick, and the method is suitable for the starting requirement of a high-power emergency power station comprising the internal combustion engine.

Optionally, the electric pump is activated to deliver fuel to the first accumulator chamber, the second accumulator chamber, and the common rail when the hydraulic oil supply is activated.

Alternatively, the fuel pressure in the second pressure accumulation chamber is 6bar to 10 bar.

Optionally, when the rotating speed of the crankshaft of the internal combustion engine is more than or equal to 40% of the rated rotating speed, the electric pump stops working, and the mechanical pump starts working.

Optionally, the hydraulic oil supply device further comprises a first check valve, a first valve inlet of the first check valve is communicated with a first pump outlet of the electric pump, and a first valve outlet of the first check valve is communicated with the second oil inlet.

Optionally, the hydraulic oil supply device further comprises a second one-way valve, a second valve inlet of the second one-way valve is communicated with a second pump outlet of the mechanical pump, and a second valve outlet of the second one-way valve is communicated with the second oil inlet.

Optionally, the hydraulic oil supply device further comprises an overflow valve, an overflow inlet of the overflow valve is communicated with the second oil inlet, and an overflow outlet of the overflow valve is communicated with the inner space of the oil tank through an oil return pipeline.

Optionally, the hydraulic oil supply device further comprises a temperature sensor, a pipeline pressure sensor and a connecting module, the temperature sensor, the pipeline pressure sensor and the overflow valve are all arranged on the connecting module, the overflow inlet is communicated with the second pressure storage cavity through a module internal channel of the connecting module, and the temperature sensor and the pipeline pressure sensor are used for measuring the temperature and the pressure of the fuel oil in the module internal channel.

Optionally, the hydraulic oil supply apparatus further includes a coarse filter provided on a tank pipe communicating with a tank outlet of the tank to filter the fuel flowing out of the tank, and a fine filter provided on an oil inlet pipe communicating with the second oil inlet to filter the fuel flowing out of the electric pump or the mechanical pump.

The utility model also provides a boats and ships, boats and ships include: an internal combustion engine; the hydraulic oil supply device is provided.

According to the utility model discloses a ship, ship includes internal-combustion engine and the hydraulic pressure oil supply unit of aforementioned internal-combustion engine, when starting the internal-combustion engine, can start the electric pump, in order to fill oil in advance through the electric pump, mechanical pump is in the stop state this moment, the electric pump carries the fuel in with the oil tank to high pressure oil pump, high pressure oil pump carries to second pressure storage chamber after with fuel pressure increase, thus, when starting the internal-combustion engine, carry the fuel to high pressure oil pump through the electric pump, because the fuel feeding pressure of electric pump is big, consequently, can make the fuel be full of the second pressure storage chamber relatively fast, first pressure storage chamber, the inside cavity of common rail pipe, and high pressure fuel pipe. The common rail pressure can be quickly established in the common rail pipe, the starting of the internal combustion engine is quick, and the method is suitable for the starting requirement of a high-power emergency power station comprising the internal combustion engine.

Drawings

In order that the advantages of the invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings.

Fig. 1 is a schematic view of a conventional hydraulic oil supply device of a high-power marine diesel engine;

fig. 2 is a schematic view of a hydraulic oil supply apparatus of a diesel engine according to a first preferred embodiment of the present invention; and

fig. 3 is a schematic view illustrating a connection block of the hydraulic oil supply apparatus of the diesel engine of fig. 2 and a relief valve connected together.

Description of reference numerals:

10: the fuel injector 20: a common rail pipe;

21: relief valve 22: pipeline pressure sensor

24: the electronic control unit 25: temperature sensor

27: safety valve 29: rail pressure sensor

30: the high-pressure oil pump 31: fine filter

32: the strainer 40: oil tank

50: oil return pipe 70: mechanical pump

110: an oil injector 111: first oil return opening

112: first pressure accumulation chamber 113: first oil inlet

120: common rail pipe 121: third oil outlet

122: internal cavity 123: third oil inlet

124: third oil return port 130: high-pressure oil pump

131: second oil outlet 132: second pressure accumulation cavity

133: second oil inlet 134: second oil return port

140: oil tank 141: oil return port of oil tank

142: a tank outlet 150: oil return pipeline

160: the electric pump 170: mechanical pump

180: first check valve 190: second check valve

210: relief valve 211: overflow inlet

212: overflow oil return port 220: pipeline pressure sensor

230: the connection module 231: temperature interface

232: pressure interface 233: overflow connector

234: first liquid inlet 235: a second liquid inlet

236: module oil outlet 240: electronic control unit

250: temperature sensor 260: oil tank pipeline

270: the safety valve 280: oil inlet pipeline

290: rail pressure sensor 310: fine filter

320: the strainer 330: stop valve

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring embodiments of the present invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

The utility model provides a hydraulic pressure oil supply unit of internal-combustion engine. The hydraulic oil supply device is used for spraying atomized fuel oil to a combustion chamber of the internal combustion engine so as to enable the internal combustion engine to run. The internal combustion engine may be a diesel engine.

In the present embodiment, as shown in fig. 2, the hydraulic oil supply device includes an injector 110 and a tank 140. The fuel injector 110 includes a first pressure accumulation chamber 112 at a head of the fuel injector 110, a fuel injection port at a bottom of the fuel injector 110, a first fuel inlet 113 communicating with the first pressure accumulation chamber 112, and a first fuel return port 111 at a side of the fuel injector 110. The first accumulator chamber 112 is used to store high pressure fuel. The first accumulation chamber 112, the injection port, and the first oil return port 111 are communicated through an injector internal passage of the injector 110. The first oil inlet 113 communicates with a third oil outlet 121 of the common rail 120, hereinafter referred to as a high pressure conduit, so that fuel in the internal cavity 122 of the common rail 120 can enter the first accumulator chamber 112 of the fuel injector 110. The fuel injection port is located in a combustion chamber of the internal combustion engine. Thus, the high-pressure fuel in the first accumulation chamber 112 flows through the injector internal passage to the injection port, and the injection port sprays a mist of fuel into the combustion chamber of the internal combustion engine.

The tank 140 includes an interior space, a tank return port 141 communicating with the interior space, and a tank outlet port 142 communicating with the interior space. The inner space of the fuel tank 140 is provided with fuel. The first oil return port 111 of the injector 110 communicates with a tank oil return port 141 of the tank 140 through an oil return pipe 150. Thus, the fuel in the injector 110 may flow to the inner space of the tank 140 through the return pipe 150. The tank outlet 142 of the tank 140 communicates with a tank conduit 260.

In this embodiment, the hydraulic oil supply device further includes a common rail 120. The common rail 120 may be a high pressure common rail. The common rail 120 includes an internal cavity 122, and a third oil inlet 123, a third oil outlet 121, and a third oil return 124 all communicating with the internal cavity 122. The third oil inlet 123 is communicated with a second oil outlet 131 of the high-pressure oil pump 130 later through a high-pressure pipeline, so that the fuel in the second pressure accumulation chamber 132 of the high-pressure oil pump 130 can enter the internal cavity 122 of the common rail pipe 120. The third oil outlet 121 is communicated with the first oil inlet 113 of the oil injector 110 through a high-pressure pipeline. The third return port 124 communicates with a return line 150 so that the fuel in the internal cavity 122 of the common rail 120 can flow to the internal space of the fuel tank 140 through the return line 150.

Preferably, the hydraulic pressure supply device further includes a relief valve 270. The liquid inlet of the relief valve 270 communicates with the third oil return port 124 of the common rail pipe 120. The liquid outlet of the relief valve 270 is in communication with the return line 150, which prevents the pressure of the fuel in the common rail 120 from exceeding a predetermined value. The preset value is the rated pressure of the relief valve 270.

In the present embodiment, the hydraulic oil supply device further includes a high-pressure oil pump 130. The high-pressure oil pump 130 includes a second pressure accumulation chamber 132, a second oil inlet 133, a second oil outlet 131, and a second oil return port 134. The second pressure accumulation chamber 132 communicates with the second oil return port 134 and the second oil outlet port 131, respectively. The second return port 134 communicates with the return line 150 so that the fuel in the second pressure accumulation chamber 132 of the high-pressure fuel pump 130 can flow to the inner space of the fuel tank 140 through the return line 150. The second oil outlet 131 is communicated with the third oil inlet 123 of the common rail pipe 120 through a high pressure pipe. The second oil inlet 133 communicates with the oil feed pipe 280 so that fuel can be supplied to the high-pressure oil pump 130 through the oil feed pipe 280. The high-pressure oil pump 130 then increases the pressure of the fuel and delivers the fuel into the second pressure accumulation chamber 132.

Preferably, the high pressure oil pump 130 may increase the pressure of the fuel to a range of 6bar to 10 bar. And then stored in the second pressure accumulation chamber 132. Thus, the pressure of the fuel in the second pressure accumulation chamber 132, the first pressure accumulation chamber 112, the internal cavity 122 of the common rail 120, and the high-pressure pipe is 6bar to 10 bar.

In the present embodiment, the hydraulic oil supply device further includes an electric pump 160. The electric pump 160 includes a first pump outlet and a first pump inlet. The first pump outlet is in communication with the oil inlet conduit 280 via a conduit. The first pump inlet communicates with the tank line 260 through a line. In this way, the electric pump 160 can deliver the fuel in the fuel tank 140 to the second inlet port 133 of the high-pressure oil pump 130 through the inlet pipe 280.

In the present embodiment, the hydraulic oil supply device further includes a mechanical pump 170. The mechanical pump 170 may be a gear pump. The mechanical pump 170 includes a second pump outlet and a second pump inlet. The second pump outlet is in communication with the oil inlet conduit 280 via a conduit. The second pump inlet communicates with the tank line 260 via a line. In this way, the mechanical pump 170 can deliver the fuel in the fuel tank 140 to the second oil inlet 133 of the high-pressure oil pump 130 through the oil inlet pipe 280.

In this embodiment, the hydraulic oil supply apparatus further includes a first check valve 180 and a second check valve 190. The first valve inlet of the first check valve 180 communicates with the first pump outlet of the electric pump 160. The first valve outlet of the first check valve 180 communicates with the oil feed pipe 280. Thus, fuel in the fuel inlet line 280 is prevented from flowing backward to the first pump outlet of the electric pump 160. The second valve inlet of the second one-way valve 190 is in communication with the second pump outlet of the mechanical pump 170. The second valve outlet of the second check valve 190 communicates with the oil feed pipe 280. Thereby, fuel in the fuel inlet line 280 is prevented from flowing back to the second pump outlet of the mechanical pump 170. The first check valve 180 and the second check valve 190 can prevent the electric pump 160 and the mechanical pump 170 from interfering with each other.

In this embodiment, when starting the internal combustion engine, the electric pump 160 may be started to prime the oil with the electric pump 160, the mechanical pump 170 may be stopped, the electric pump 160 may supply the fuel in the oil tank 140 to the high-pressure oil pump 130, and the high-pressure oil pump 130 may supply the increased pressure of the fuel to the second pressure accumulation chamber 132. In this way, when the internal combustion engine is started, fuel is supplied to the high-pressure oil pump 130 by the electric pump 160, and the fuel supply pressure of the electric pump 160 is high, so that the second pressure accumulation chamber 132, the first pressure accumulation chamber 112, the internal cavity 122 of the common rail 120, and the high-pressure oil pipe can be filled with fuel relatively quickly. The common rail pressure can be quickly established in the common rail pipe 120, the starting of the internal combustion engine is quick, and the method is suitable for the starting requirement of a high-power emergency power station comprising the internal combustion engine.

In embodiments not shown, a pneumatic pump may also be provided. Thus, when starting the engine, fuel in the tank 140 is delivered to the high pressure oil pump 130 by the pneumatic pump.

In the present embodiment, after the internal combustion engine is successfully started, when the rotation speed of the crankshaft of the internal combustion engine is greater than or equal to 40% of the rated rotation speed, the mechanical pump 170 operates normally, i.e., the common rail pressure in the common rail pipe 120 can be ensured. Thus, when the rotational speed of the crankshaft of the internal combustion engine is equal to or greater than 40% of the rated rotational speed, the operation of the electric pump 160 can be stopped and the operation of the mechanical pump 170 can be started.

In the present embodiment, as shown in fig. 2 and 3, the hydraulic oil supply device further includes a relief valve 210, a temperature sensor 250, a line pressure sensor 220, and a connection module 230. The connection module 230 is provided with a module internal channel, a temperature interface 231, a pressure interface 232, an overflow interface 233, a first liquid inlet 234, a second liquid inlet 235, and a module oil outlet 236. The overflow valve 210 includes an overflow inlet 211 and an overflow return port 212. The first fluid inlet 234 and the second fluid inlet 235 are both in communication with the oil inlet conduit 280. Overflow port 233, first liquid inlet 234, second liquid inlet 235, temperature port 231, and pressure port 232 all communicate with the module internal passages of connection module 230. The temperature sensor 250 is connected to the temperature interface 231 to measure the temperature of the liquid within the module internal channel of the connection module 230. The line pressure sensor 220 is connected to the pressure port 232 to measure the pressure of the liquid within the module internal passage of the connection module 230.

The overflow inlet 211 of the overflow valve 210 is connected to the overflow connection 233, and at this time, the overflow inlet 211 of the overflow valve 210 is communicated to the overflow connection 233, so that the pressure of the liquid in the module internal passage of the connection module 230 is maintained within a preset range. Therefore, the overflow valve 210, the pipeline pressure sensor 220 and the temperature sensor 250 are integrated through the connecting module 230, so that the hydraulic oil supply device is more compact and simple in structure; the overflow valve 210 is convenient to adjust, the hydraulic oil supply device is convenient to maintain, and the reliability of the hydraulic oil supply device is improved. And the module internal passage of the connection module 230 branches the fluid in the oil feed pipe 280 to the pipe pressure sensor 220, the temperature sensor 250, the high pressure oil pump 130, and the overflow inlet 211 of the overflow valve 210.

In the present embodiment, the spill oil return port 212 of the relief valve 210 communicates with the oil return pipe 150. The relief valve 210 may be a straight relief valve 210. By adjusting the overflow valve 210, the pressure of the fuel in the oil inlet pipe 280 can be kept within a preset range, the pressure value of the fuel entering the second oil inlet 133 of the high-pressure oil pump 130 is stable, and the pressure stable adjustment of the oil inlet pipe 280 under the full working condition is realized. Compared with the mode of controlling the fuel pressure in the oil inlet pipeline 280 by using the orifice plate and the check valve, in the embodiment, the pressure of the fuel in the oil inlet pipeline 280 is more stable due to the action of the overflow valve 210, so that the pressure of the fuel in the oil inlet pipeline 280 is not influenced by the engine speed, and the phenomenon of high pressure build-up of the fuel in the oil inlet pipeline 280 is avoided.

In the present embodiment, the hydraulic oil supply device may include an ECU electronic control unit 240. The temperature sensor 250, the line pressure sensor 220, the injector 110, and the high pressure oil pump 130 may be electrically connected to the electronic control unit 240. So that the electronic control unit 240 can acquire the temperature of the fuel in the fuel inlet pipe 280 in real time through the temperature sensor 250. The electronic control unit 240 may acquire the pressure of the fuel in the fuel inlet pipe 280 in real time through the pipe pressure sensor 220. The electronic control unit 240 may control the operation of the high pressure oil pump 130 in real time according to the pressure and temperature of the fuel in the fuel inlet pipe 280. The electronic control unit 240 may control the injector 110 to spray atomized fuel into the combustion chamber of the internal combustion engine. The electronic control unit 240 may also be electrically connected to the electric pump 160 and the mechanical pump 170 to control the operation of the electric pump 160 and the mechanical pump 170, so as to implement the automatic operation of the hydraulic oil supply device.

In the present embodiment, the hydraulic oil supply device further includes a rail pressure sensor 290. The rail pressure sensor 290 may be a pressure sensor. A rail pressure sensor 290 is disposed on the common rail 120 to measure the pressure of the fuel within the internal cavity 122 of the common rail 120. The rail pressure sensor 290 is electrically connected to the electronic control unit 240, so that the electronic control unit 240 can obtain the pressure of the fuel in the internal cavity 122 of the common rail 120 in real time through the rail pressure sensor 290, thereby controlling the operation of the high pressure oil pump 130.

In this embodiment, the hydraulic oil supply device further includes a fine filter 310. A fine filter 310 is provided on the oil inlet line 280 to filter out smaller particulate impurities from the fuel on the oil inlet line 280. In the flow direction of the fuel on the fuel inlet pipe 280, the fine filter 310, the temperature sensor 250, and the pipe pressure sensor 220 are sequentially disposed. That is, the fuel flows out from the first pump outlet of the electric pump 160 or the second pump outlet of the mechanical pump 170, and then flows through the fine filter 310, the temperature sensor 250, and the pipeline pressure sensor 220 in sequence and enters the second oil inlet 133 of the high-pressure oil pump 130.

In this embodiment, the hydraulic oil supply device further includes a strainer 320 and a stop valve 330. A strainer 320 and a shut valve 330 are provided on the tank pipe 260. The strainer 320 thus filters out larger particulate contaminants from the fuel exiting the tank outlet 142. The shutoff valve 330 may close the tank line 260 at any time to prevent fuel in the tank 140 from entering the electric pump 160 and the mechanical pump 170. In this way, the tank line 260 can be closed by closing the shut-off valve 330 in an emergency.

The embodiment also provides a ship. The marine vessel may comprise a generator set comprising an internal combustion engine and the aforementioned hydraulic oil supply.

In this embodiment, the ship may include a generator set including the internal combustion engine and the aforementioned hydraulic oil supply device, and when starting the internal combustion engine, the electric pump 160 may be started to pre-charge the oil by the electric pump 160, and at this time, the mechanical pump 170 is in a stopped state, the electric pump 160 supplies the fuel in the oil tank 140 to the high-pressure oil pump 130, and the high-pressure oil pump 130 supplies the increased pressure of the fuel to the second pressure accumulation chamber 132. In this way, when the internal combustion engine is started, fuel is supplied to the high-pressure oil pump 130 by the electric pump 160, and the fuel supply pressure of the electric pump 160 is high, so that the second pressure accumulation chamber 132, the first pressure accumulation chamber 112, the internal cavity 122 of the common rail 120, and the high-pressure oil pipe can be filled with fuel relatively quickly. The common rail pressure can be quickly established in the common rail pipe 120, the starting of the internal combustion engine is quick, and the method is suitable for the starting requirement of a high-power emergency power station comprising the internal combustion engine.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "component" and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. It will be appreciated by those skilled in the art that many more modifications and variations are possible in light of the above teaching and are intended to be included within the scope of the invention.

Claims (10)

1. A hydraulic fuel supply apparatus for an internal combustion engine including a fuel injector for spraying mist-like fuel into a combustion chamber of the internal combustion engine, characterized by comprising:

the internal cavity of the common rail pipe is communicated with the first pressure accumulation cavity of the oil injector;

the high-pressure oil pump is used for increasing the pressure of fuel oil entering from a second oil inlet of the high-pressure oil pump and then conveying the fuel oil to the second pressure storage cavity;

the internal space of the oil tank is respectively communicated with a first oil return port of the oil sprayer, a second oil return port of the high-pressure oil pump and a third oil return port of the common rail pipe through an oil return pipeline;

the first pump outlet of the electric pump is communicated with the second oil inlet, and the first pump inlet of the electric pump is communicated with the inner space of the oil tank;

and a second pump outlet of the mechanical pump is communicated with the second oil inlet, and a second pump inlet of the mechanical pump is communicated with the inner space of the oil tank.

2. The hydraulic fuel supply of claim 1, wherein upon activation of the hydraulic fuel supply, the electric pump is activated to deliver fuel to the first accumulator chamber, the second accumulator chamber, and the common rail.

3. The hydraulic oil supply apparatus according to claim 2, wherein the fuel pressure in the second accumulator chamber is 6 to 10 bar.

4. The hydraulic oil supply apparatus according to claim 2, wherein when the rotational speed of the crankshaft of the internal combustion engine is equal to or greater than 40% of the rated rotational speed, the electric pump stops operating and the mechanical pump starts operating.

5. The hydraulic oil supply apparatus of claim 1 further comprising a first one-way valve, a first valve inlet of the first one-way valve communicating with a first pump outlet of the electric pump, a first valve outlet of the first one-way valve communicating with the second oil inlet.

6. The hydraulic oil supply apparatus of claim 1 further comprising a second one-way valve having a second valve inlet in communication with the second pump outlet of the mechanical pump and a second valve outlet in communication with the second oil inlet.

7. The hydraulic oil supply apparatus according to claim 1, further comprising an overflow valve, an overflow inlet of which communicates with the second oil inlet, and an overflow outlet of which communicates with the internal space of the oil tank through the oil return pipe.

8. The hydraulic oil supply apparatus according to claim 7, further comprising a temperature sensor, a line pressure sensor, and a connection block, wherein the temperature sensor, the line pressure sensor, and the overflow valve are provided on the connection block, the overflow port communicates with the second pressure accumulation chamber through a block internal passage of the connection block, and the temperature sensor and the line pressure sensor are used to measure the temperature and pressure of the fuel in the block internal passage.

9. The hydraulic oil supply apparatus according to claim 1, further comprising a coarse filter provided on a tank pipe communicating with a tank outlet of the tank to filter the fuel flowing out of the tank, and a fine filter provided on an oil feed pipe communicating with the second oil inlet to filter the fuel flowing out of the electric pump or the mechanical pump.

10. A marine vessel, characterized in that the marine vessel comprises:

an internal combustion engine; and

the hydraulic oil supply apparatus according to any one of claims 1 to 9.

Images