Internal combustion engine system

Abstract

The present invention provides an internal combustion engine system that can suppress damage to components placed in the fuel flow path connecting the storage tank and the dispensing tank. [Solution] The internal combustion engine system 10 includes a storage tank 210 in which fuel is stored, a small discharge tank 220 connected to the internal combustion engine 100, a first flow path 230 which is a fuel flow path connecting the storage tank 210 and the small discharge tank 220, an on-off valve 260 located in the first flow path 230, a check valve 270 located between the storage tank 210 and the on-off valve 260 in the first flow path 230, and a pressure relief valve 290 located in a second flow path 280 which branches off from between the check valve 270 and the on-off valve 260 in the first flow path 230, wherein the second flow path 280 is connected to a position in the first flow path 230 different from the position between the check valve 270 and the on-off valve 260.

Description

Technical Field

[0001] The present invention relates to an internal combustion engine system that supplies fuel to an internal combustion engine.

Background Art

[0002] Patent Document 1 discloses a configuration in which fuel is supplied from a fuel tank in which fuel is stored to an internal combustion engine through a fuel passage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In Patent Document 1 described above, fuel is supplied from a fuel tank to an internal combustion engine. Conventionally, a small outlet tank has been arranged between a fuel tank (hereinafter also referred to as a fuel storage tank) and an internal combustion engine, and after fuel is once stored in the small outlet tank, it is known that the fuel is supplied from the small outlet tank to the internal combustion engine. In this case, the fuel flow path connecting the storage tank and the small outlet tank is arranged outdoors, and when the flow path is exposed to high temperatures in summer or the like, the inside of the flow path may expand and the pressure inside the flow path may rise. When the pressure inside the flow path rises, there is a risk that various members such as valves, pipes, flanges, or other devices arranged in the flow path may be damaged.

[0005] The present invention has been made by the inventors of the present application newly paying attention to the above problems, and an object thereof is to provide an internal combustion engine system capable of suppressing damage to members arranged in a fuel flow path connecting a storage tank and a small outlet tank.

Means for Solving the Problems

[0006] An internal combustion engine system according to one aspect of the present invention comprises a storage tank for storing fuel, a small discharge tank connected to an internal combustion engine, a first flow path which is a fuel flow path connecting the storage tank and the small discharge tank, an on-off valve disposed in the first flow path, a check valve disposed between the storage tank and the on-off valve in the first flow path, and a pressure relief valve disposed in a second flow path branched from between the check valve and the on-off valve in the first flow path, wherein the second flow path is connected to a position in the first flow path different from the position between the check valve and the on-off valve. [Effects of the Invention]

[0007] According to the internal combustion engine system of the present invention, damage to components placed in the fuel flow path connecting the storage tank and the dispensing tank can be suppressed. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram showing the general configuration of an internal combustion engine system according to an embodiment. [Figure 2] Figure 2 is a schematic diagram showing the configuration of an internal combustion engine and its surroundings according to an embodiment. [Figure 3] Figure 3 is a schematic diagram showing the configuration of the first flow path and its surroundings according to the embodiment. [Figure 4] Figure 4 is a schematic diagram showing the configuration of the first flow path and its surroundings when the pressure relief valve according to the embodiment is open. [Figure 5] Figure 5 is a schematic diagram showing the configuration of the first channel and its surroundings according to a modified example 1 of the embodiment. [Figure 6] Figure 6 is a schematic diagram showing the configuration of the first channel and its surroundings according to a modified example 2 of the embodiment. [Figure 7] Figure 7 is a schematic diagram showing the configuration of the first channel and its surroundings according to a modified example 3 of the embodiment. [Figure 8] Figure 8 is a schematic diagram showing the configuration of the first channel and its surroundings according to a modified example 4 of the embodiment. [Figure 9]Figure 9 is a schematic diagram showing the configuration of the first channel and its surroundings according to modified example 5 of the embodiment. [Modes for carrying out the invention]

[0009] An internal combustion engine system according to one aspect of the present invention comprises a storage tank for storing fuel, a small discharge tank connected to an internal combustion engine, a first flow path which is a fuel flow path connecting the storage tank and the small discharge tank, an on-off valve disposed in the first flow path, a check valve disposed between the storage tank and the on-off valve in the first flow path, and a pressure relief valve disposed in a second flow path branched from between the check valve and the on-off valve in the first flow path, wherein the second flow path is connected to a position in the first flow path different from the position between the check valve and the on-off valve.

[0010] According to this, in an internal combustion engine system, a pressure relief valve is positioned in a second flow path that branches off from between the check valve and the on-off valve in the first flow path connecting the storage tank and the discharge tank, and the second flow path is connected to a different position in the first flow path than between the check valve and the on-off valve. As a result, even if the on-off valve closes and the pressure between the on-off valve and the check valve in the first flow path rises, the pressure relief valve can release the pressure from the second flow path to a different position in the first flow path than between the check valve and the on-off valve. Therefore, damage to components such as on-off valves, check valves, piping, flanges, or other equipment located in the first flow path, which is the fuel flow path connecting the storage tank and the discharge tank, can be suppressed.

[0011] Furthermore, the second flow path may be connected between the on-off valve and the small discharge tank in the first flow path.

[0012] According to this, since the second flow path is connected between the on-off valve and the small discharge tank in the first flow path, the pressure between the check valve and the on-off valve in the first flow path can be released to the small discharge tank side of the first flow path. Thereby, the fuel in the second flow path can be sent to the small discharge tank side of the first flow path, which is the fuel advancing direction. Further, a check valve may be arranged at the outlet of the storage tank in the first flow path. In this case, the pressure cannot be released to the storage tank side (downstream of the check valve). Therefore, by connecting the second flow path to the small discharge tank side of the first flow path, the pressure can be released to the small discharge tank side of the first flow path.

[0013] Further, the small discharge tank may be provided with a pressure relief mechanism.

[0014] According to this, since the small discharge tank is provided with a pressure relief mechanism, the pressure that has escaped to the small discharge tank through the second flow path can be released from the small discharge tank by the pressure relief mechanism.

[0015] Further, the first flow path includes a transfer flow path that is a flow path for transferring the fuel from the storage tank to the small discharge tank, and an overflow flow path that is a flow path for returning the fuel that has overflowed from the small discharge tank to the storage tank. The second flow path may be connected to the overflow flow path.

[0016] According to this, the second flow path is connected to an overflow flow path that returns the fuel that has overflowed from the small discharge tank to the storage tank. Thereby, by using the overflow flow path provided in the small discharge tank, the pressure in the first flow path can be released through the second flow path.

[0017] Further, the internal combustion engine system includes at least one of a plurality of the storage tanks and a plurality of the small discharge tanks. The on-off valve and the check valve are arranged in each of the plurality of first flow paths connected to at least one of the plurality of storage tanks and the plurality of small discharge tanks, and the pressure relief valve is arranged in the second flow path branched from each of the first flow paths.

[0018] According to this, since the internal combustion engine system includes at least one of a plurality of storage tanks and a plurality of small discharge tanks, the on-off valve in the first flow path connected to the storage tank or small discharge tank that does not supply fuel by selection will be closed. As a result, although the pressure between the on-off valve and the check valve in the first flow path connected to the storage tank or small discharge tank that does not supply fuel by selection may increase, the pressure relief valve can release the pressure from the second flow path.

[0019] Also, at least a part between the check valve and the on-off valve in the first flow path may be arranged outdoors.

[0020] According to this, since at least a part between the check valve and the on-off valve in the first flow path is arranged outdoors, in summer or the like, the inside of the flow path arranged outdoors may become hot and expand, and the pressure may increase. Therefore, the effect of releasing the pressure between the on-off valve and the check valve in the first flow path from the second flow path by the pressure relief valve is high.

[0021] Also, the internal combustion engine system may further include a transfer pump arranged between the storage tank and the check valve in the first flow path for transferring the fuel.

[0022] According to this, a fuel transfer pump is arranged between the storage tank and the check valve in the first flow path. As a result, there is a risk that the on-off valve may close with the pressure between the check valve and the on-off valve increased by the transfer pump, or that the transfer pump may be driven even after the on-off valve closes and the pressure between the check valve and the on-off valve may increase. Even in such a case, the pressure between the check valve and the on-off valve in the first flow path can be released from the second flow path by the pressure relief valve.

[0023] The following description of an internal combustion engine system according to an embodiment (including its modifications) of the present invention will be given with reference to the drawings. The embodiments described below are all general or specific examples. The numerical values, shapes, materials, components, arrangement and connection configurations of components, processes, and process sequences shown in the following embodiments are examples only and are not intended to limit the present invention. Each figure is a schematic diagram, and dimensions, shapes, etc., are not precisely represented. In each figure, the same or similar components are denoted by the same reference numerals.

[0024] (Embodiment) [1. Overview of the internal combustion engine system 10] First, the general configuration of the internal combustion engine system 10 in this embodiment will be described. Figure 1 is a schematic diagram showing the general configuration of the internal combustion engine system 10 according to this embodiment.

[0025] As shown in Figure 1, the internal combustion engine system 10 is a system that operates the internal combustion engine 100 to drain water from the drainage facility 400. Specifically, the internal combustion engine system 10 supplies starting air (high-pressure air) generated in the air generation unit 310 and stored in the air tank 330 to the internal combustion engine 100 to start the engine. Next, the internal combustion engine system 10 supplies fuel stored in the storage tank 210 to the internal combustion engine 100 via the small discharge tank 220 to maintain the operation of the internal combustion engine 100, and drives the drainage pumps and other equipment of the drainage facility 400 via the reduction gear 120 to drain water. The components of the internal combustion engine system 10 will be described in detail below.

[0026] The internal combustion engine system 10 includes an internal combustion engine 100, a reduction gear 120, a silencer 130, an exhaust passage 131, a storage tank 210, a small discharge tank 220, a first passage 230, a transfer pump 240, a fuel passage 250, an air generation unit 310, an air passage 320, an air tank 330, and a drainage system 400. In addition to the above configuration, the internal combustion engine system 10 may also include a lubricating oil injection mechanism (lubricating oil injection pump, oil cooler, etc.) and a cooling mechanism (cooling water tank, cooling water pump, etc.).

[0027] In this embodiment, the internal combustion engine 100 is a diesel engine that uses heavy oil or light oil as fuel. The internal combustion engine 100 comprises a plurality of combustion chambers 110, which are the main body of the internal combustion engine 100, and a first rotating shaft 111 connected to a reduction gear 120. The first rotating shaft 111 rotates as the plurality of combustion chambers 110 operate. A detailed explanation of the configuration of the internal combustion engine 100 (combustion chambers 110) will be given later.

[0028] The gear reducer 120 is a device that reduces the rotational speed of the first rotating shaft 111 of the internal combustion engine 100. The gear reducer 120 is equipped with a second rotating shaft 121 and reduces the rotational speed of the first rotating shaft 111 of the internal combustion engine 100 according to the rotational speed of the device to be driven (in this embodiment, a drainage pump provided in the drainage equipment 400, etc.), thereby rotating the second rotating shaft 121 at the desired speed. Any known device can be used as the gear reducer 120.

[0029] The silencer 130 is a device that reduces the noise of exhaust gases discharged from the internal combustion engine 100 and passing through the exhaust passage 131. Any known device can be used as the silencer 130. The exhaust passage 131 is a passage through which exhaust gases discharged from the internal combustion engine 100 flow. In this embodiment, the exhaust passage 131 is a pipe (exhaust pipe), but it may also be a passage that does not have a tubular shape. As the exhaust passage 131, a pipe or other structure made of a known material such as carbon steel pipe or stainless steel pipe can be used, depending on the type of exhaust gas.

[0030] The storage tank 210 is a storage tank (tank) in which fuel is stored. In this embodiment, the storage tank 210 stores heavy oil or light oil, etc., which will be used as fuel for a diesel engine. In this embodiment, the storage tank 210 is located in a tank storage facility located underground, but it may also be located above ground. The size, shape, material, etc. of the storage tank 210 can be those of known type as appropriate.

[0031] The storage tank 210 is equipped with a pressure relief mechanism 211. The pressure relief mechanism 211 releases pressure when the pressure inside the storage tank 210 rises excessively. In this embodiment, the pressure relief mechanism 211 is a gas vent pipe that discharges gas when it exceeds a predetermined pressure, but it may be a mechanism other than a gas vent pipe, such as a safety valve. The pressure relief mechanism 211 can be any known mechanism that is appropriate for the pressure to be released.

[0032] The small discharge tank 220 is a fuel discharge tank connected to the storage tank 210 and the internal combustion engine 100, and is positioned in the middle of the flow path that sends the fuel stored in the storage tank 210 to the internal combustion engine 100. The small discharge tank 220 is smaller in size (storage capacity) than the storage tank 210 and temporarily stores the fuel stored in the storage tank 210 before sending it to the internal combustion engine 100. The size, shape, and material of the small discharge tank 220 can be those of known type as appropriate.

[0033] The small discharge tank 220 is equipped with a pressure relief mechanism 221. The pressure relief mechanism 221 releases pressure when the pressure inside the small discharge tank 220 rises excessively. In this embodiment, the pressure relief mechanism 221 is a gas vent pipe that discharges gas when it exceeds a predetermined pressure, but it may be a mechanism other than a gas vent pipe, such as a safety valve. The pressure relief mechanism 221 can be any known mechanism appropriate to the pressure to be released. The small discharge tank 220 is also equipped with a float switch and drain piping, etc., but these are not shown in the illustration and are not described.

[0034] The first flow path 230 is a fuel flow path connecting the storage tank 210 and the dispensing tank 220. The first flow path 230 is a flow path for sending fuel from the storage tank 210 to the dispensing tank 220 and returning fuel from the dispensing tank 220 to the storage tank 210. The first flow path 230 is a pipe (fuel pipe) through which fuel passes. As the first flow path 230, a known pipe such as a carbon steel pipe or a stainless steel pipe can be used, depending on the properties, pressure, temperature, etc. of the fuel flowing through it. The first flow path 230 is equipped with a transfer flow path 231 and an overflow flow path 232.

[0035] The transfer channel 231 is a channel for transferring fuel (fuel F1) from the storage tank 210 to the dispensing tank 220. The transfer channel 231 extends from the lower part of the storage tank 210 to the upper part of the dispensing tank 220 and is a pipe (fuel transfer pipe) that transfers fuel F1 from the storage tank 210 to the upper part of the dispensing tank 220. The overflow channel 232 is a channel for returning fuel (fuel F2) that has overflowed from the dispensing tank 220 back to the storage tank 210. The overflow channel 232 extends from the upper part of the dispensing tank 220 to the upper part of the storage tank 210 and is a pipe (overflow pipe) that returns fuel F2 that has overflowed from the upper part of the dispensing tank 220 back to the storage tank 210. When the amount of fuel in the dispensing tank 220 exceeds a predetermined level, fuel F2 flows out through the overflow channel 232 and is returned to the storage tank 210. The transfer channel 231 and the overflow channel 232 may be made of the same material and have different sizes. A more detailed explanation of the first channel 230 will be given later.

[0036] The transfer pump 240 is located between the storage tank 210 and the dispensing tank 220 in the first flow path 230 and is a pump that transfers fuel. Specifically, the transfer pump 240 is located between the storage tank 210 and the dispensing tank 220 in the transfer flow path 231 and transfers fuel F1. In this embodiment, the storage tank 210 is located below the dispensing tank 220, and the transfer pump 240 pumps up the fuel stored in the storage tank 210 and sends it to the dispensing tank 220 as fuel F1. As the transfer pump 240, any known pump such as a gear pump can be used as appropriate. A backup pump may be located in parallel with the transfer pump 240 in the transfer flow path 231. Furthermore, since the storage tank 210 is located below the dispensing tank 220, there is no pump in the overflow passage 232, and the fuel F2 that overflows from the dispensing tank 220 flows through the overflow passage 232 towards the storage tank 210.

[0037] The fuel passage 250 is a fuel passage connecting the small discharge tank 220 and the internal combustion engine 100. The fuel passage 250 extends from the bottom of the small discharge tank 220 to the internal combustion engine 100 and is a pipe (fuel transfer pipe) that transfers fuel (fuel F3) from the small discharge tank 220 to the internal combustion engine 100. As the fuel passage 250, a known pipe such as a carbon steel pipe or a stainless steel pipe can be used, depending on the properties, pressure, temperature, etc. of the fuel flowing inside. The material and size of the fuel passage 250 may be the same as or different from the first passage 230. In this embodiment, the small discharge tank 220 is located above the internal combustion engine 100, and the fuel F3 discharged from the small discharge tank 220 flows through the fuel passage 250 toward the internal combustion engine 100.

[0038] The air generation unit 310 is a device that generates high-pressure air. Specifically, the air generation unit 310 generates high-pressure air with a pressure of 2 MPa to 3 MPa, which is used as starting air for the internal combustion engine 100. In this embodiment, the air generation unit 310 is an air compressor that compresses air to generate high-pressure air (compressed air). Any known air compressor can be used as the air generation unit 310. The structure of the air generation unit 310 is not particularly limited, as long as it can generate high-pressure air (starting air, etc.).

[0039] The air passage 320 is an air passage connecting the air generation unit 310 and the internal combustion engine 100. The air passage 320 extends from the air generation unit 310 to the internal combustion engine 100 and is a pipe (air pipe) that sends high-pressure air, such as starting air A1, generated in the air generation unit 310 to the internal combustion engine 100. As the air passage 320, a carbon steel pipe or stainless steel pipe or other known pipe can be used as appropriate depending on the pressure, temperature, etc. of the air flowing inside.

[0040] The air tank 330 is an air tank (tank) that stores high-pressure air such as starting air A1 generated in the air generation unit 310. The air tank 330 is located in the middle of the air passage 320 and is provided to send high-pressure air such as starting air A1 generated in the air generation unit 310 to the internal combustion engine 100 via the air passage 320. The size, shape, and material of the air tank 330 can be those of known materials as appropriate. A spare air tank may be located in parallel with the air tank 330 in the air passage 320.

[0041] The drainage system 400 is equipped with a drainage pump (not shown) that pumps up water W and drains it. Specifically, the drainage pump in the drainage system 400 is connected to the second rotating shaft 121 of the reduction gear 120, and is driven (rotates) by the rotation of the second rotating shaft 121. In this embodiment, the drainage system 400 is equipped with a horizontal shaft pump as the drainage pump, but it may also be equipped with a vertical shaft pump.

[0042] [2. Description of the internal combustion engine 100 (combustion chamber 110) and its surrounding components] Next, the configuration of the internal combustion engine 100 (combustion chamber 110) and its surroundings will be described in detail. Figure 2 is a schematic diagram showing the configuration of the internal combustion engine 100 (combustion chamber 110) and its surroundings according to this embodiment. All of the multiple combustion chambers 110 of the internal combustion engine 100 have the same configuration. For this reason, for the sake of explanation, Figure 2 shows the configuration of one of the multiple combustion chambers 110 of the internal combustion engine 100 and its surroundings, and the configuration of one combustion chamber 110 and its surroundings will be described in detail below.

[0043] As shown in Figure 2, the combustion chamber 110 comprises a cylinder 112, a piston 113, a connecting rod 114, and a crankshaft 115. The internal combustion engine system 10 further includes an air supply unit 340 located downstream of the air tank 330 in the air passage 320, and an intake passage 350 which is the passage for intake air (combustion air) to the combustion chamber 110. Since known configurations can be appropriately adopted for the internal combustion engine 100 (combustion chamber 110) and its surroundings, detailed illustrations and explanations of the structure are omitted.

[0044] The upper part of the cylinder 112 is connected to a fuel passage 250 for supplying fuel F3, an air passage 320 for supplying starting air A1, an intake passage 350 for drawing in combustion air A2, and an exhaust passage 131 for exhausting exhaust A3. The combustion chamber 110 operates by repeating a series of processes: an intake process, a compression process, an expansion (ignition) process, and an exhaust process. A known method can be used for this series of processes as appropriate. In the expansion (ignition) process, since the air inside the cylinder 112 becomes hot in the compression process, fuel F3 is injected into the hot air from the fuel passage 250 and ignited (spontaneous ignition) the fuel F3, causing it to burn and expand in the hot air. In the exhaust process, by opening the exhaust valve (not shown) located at the outlet of the cylinder 112 in the exhaust passage 131, the piston 113 rises to top dead center inside the cylinder 112, and the gas (exhaust A3) generated by the combustion of fuel F3 is discharged from inside the cylinder 112 via the exhaust passage 131.

[0045] [3 Detailed description of the configuration of the first channel 230 and its surroundings] Next, the configuration of the first flow path 230 and its surroundings will be described in more detail. Figure 3 is a schematic diagram showing the configuration of the first flow path 230 and its surroundings according to this embodiment. Figure 3 shows the configuration of the first flow path 230 and its surroundings shown in Figure 1 in more detail. Figure 4 is a schematic diagram showing the configuration of the first flow path 230 and its surroundings when the pressure relief valve 290 according to this embodiment is open. Figure 4 shows the configuration when the pressure relief valve 290 is open in the configuration shown in Figure 3.

[0046] As shown in Figure 3, the internal combustion engine system 10 further includes an on-off valve 260, a pair of manual valves 261, a check valve 270, a second flow path 280, and a pressure relief valve 290. Here, the flow path between the storage tank 210 and the check valve 270 in the first flow path 230 (transfer flow path 231) is referred to as the first divided flow path 231a. The flow path between the check valve 270 and the on-off valve 260 in the first flow path 230 (transfer flow path 231) is referred to as the second divided flow path 231b. The flow path between the on-off valve 260 and the small discharge tank 220 in the first flow path 230 (transfer flow path 231) is referred to as the third divided flow path 231c.

[0047] The transfer pump 240 is positioned between the storage tank 210 and the check valve 270 in the first flow path 230 to transfer fuel. In other words, the transfer pump 240 is positioned in the first divided flow path 231a of the transfer flow path 231 of the first flow path 230. In this embodiment, a check valve 212 is positioned at the outlet of the storage tank 210 in the first divided flow path 231a, and the transfer pump 240 is positioned between the check valve 212 and the check valve 270 in the first divided flow path 231a. The check valve 212 allows flow from the storage tank 210 toward the check valve 270 and prevents flow (backflow) from the check valve 270 toward the storage tank 210. Any known check valve can be used as the check valve 212.

[0048] The on-off valve 260 is an on-off valve located in the first flow path 230. Specifically, the on-off valve 260 is located downstream of the transfer pump 240 in the transfer flow path 231 of the first flow path 230 (between the transfer pump 240 and the small discharge tank 220). In this embodiment, the on-off valve 260 is a solenoid valve that opens and closes with the force of an electromagnet. The on-off valve 260 is not limited to a solenoid valve; it may also be an air-operated valve that opens and closes with the force of air, or a control valve that can adjust the flow rate, etc. Any valve that can be opened and closed may be used as the on-off valve 260, and any known valve can be used as appropriate.

[0049] The pair of manual valves 261 are valves (such as gate valves) that can be opened and closed manually (by human power). The pair of manual valves 261 are positioned before and after (upstream and downstream of) the on-off valve 260 in the transfer path 231 of the first flow path 230. The pair of manual valves 261 are used when the on-off valve 260 is being maintained or replaced. Any known type of manual valve 261 can be used as appropriate.

[0050] The check valve 270 is a check valve positioned between the storage tank 210 and the on-off valve 260 in the first flow path 230. Specifically, the check valve 270 is positioned downstream of the transfer pump 240 in the transfer flow path 231 of the first flow path 230, and between the transfer pump 240 and the on-off valve 260 (manual valve 261). The check valve 270 allows flow from the storage tank 210 (transfer pump 240) towards the on-off valve 260 (manual valve 261) and prevents flow (backflow) from the on-off valve 260 (manual valve 261) towards the storage tank 210 (transfer pump 240). Any known check valve can be used as appropriate.

[0051] The second flow path 280 is a flow path that branches off from between the check valve 270 and the on-off valve 260 in the first flow path 230. Specifically, the second flow path 280 branches off from the second divided flow path 231b, which is the flow path between the check valve 270 and the on-off valve 260 in the transfer flow path 231 of the first flow path 230. In this embodiment, the second flow path 280 branches off from the flow path between the check valve 270 and the upstream manual valve 261 in the second divided flow path 231b, but it may also branch off from the flow path between the upstream manual valve 261 and the on-off valve 260 in the second divided flow path 231b. As the second flow path 280, a carbon steel pipe or stainless steel pipe, or any other known piping can be used as appropriate depending on the properties, pressure, temperature, etc. of the fuel flowing inside. The material and size of the second flow path 280 may be the same as or different from those of the first flow path 230.

[0052] The second flow path 280 is connected to a different position in the first flow path 230 than the check valve 270 and the on-off valve 260. In other words, the second flow path 280 is connected to a different position in the transfer flow path 231 of the first flow path 230 than the second divided flow path 231b. Since the second flow path 280 branches off from the second divided flow path 231b, one end of the second flow path 280 is connected to the second divided flow path 231b, and the other end is connected to a different position from the second divided flow path 231b.

[0053] In this embodiment, the second flow path 280 is connected between the on-off valve 260 and the small discharge tank 220 in the first flow path 230. In other words, the second flow path 280 is connected to the third divided flow path 231c in the transfer flow path 231 of the first flow path 230. In this embodiment, the second flow path 280 is connected between the downstream manual valve 261 and the small discharge tank 220 in the third divided flow path 231c, but it may also be connected between the on-off valve 260 and the downstream manual valve 261 in the third divided flow path 231c.

[0054] At least a portion of the section between the check valve 270 and the on-off valve 260 in the first channel 230 is located outdoors. In other words, at least a portion of the second divided channel 231b in the transfer channel 231 of the first channel 230 is located outdoors. For this reason, at least a portion of the second divided channel 231b is formed of outdoor piping (outdoor piping), and is painted with a paint that suppresses ultraviolet degradation or rust-preventive paint, or is fitted with a protective cover, or is made of a material resistant to deterioration and corrosion such as stainless steel pipe. In this embodiment, the entire second divided channel 231b is located outdoors, and the entire second divided channel 231b is formed of outdoor piping (outdoor piping). Other parts of the first channel 230 and the second channel 280 may also be formed of outdoor piping if they are located outdoors, or they may be formed of outdoor piping even if they are not located outdoors.

[0055] The pressure relief valve 290 is located in the second flow path 280, which branches off from between the check valve 270 and the on-off valve 260 in the first flow path 230. In other words, the pressure relief valve 290 is located in the second flow path 280, which branches off from the second divided flow path 231b in the transfer flow path 231 of the first flow path 230. The pressure relief valve 290 is normally closed, and when the pressure upstream (inlet side) rises to a predetermined pressure value or higher, it opens its valve body to release the pressure upstream (inlet side) to the downstream (outlet side), and closes its valve body again when the pressure falls below the predetermined pressure value. This predetermined pressure value is set appropriately according to the allowable pressure of the on-off valve 260, the check valve 270, the piping and flanges in the first flow path 230 (transfer flow path 231, second divided flow path 231b), or other equipment that you want to prevent damage to. In this embodiment, the pressure relief valve 290 has a mechanism to open mechanically (automatically) at a predetermined pressure value. Any known pressure relief valve 290 can be used as appropriate.

[0056] Specifically, as shown in Figure 4, when the on-off valve 260 is closed and the second divided passage 231b, which is the passage between the check valve 270 and the on-off valve 260, becomes a sealed structure, the pressure in the second divided passage 231b may rise due to a rise in temperature or other factors. In particular, since the second divided passage 231b is located outdoors, the temperature in the second divided passage 231b rises during the summer, and the pressure in the second divided passage 231b rises. In this case, the on-off valve 260, the check valve 270, the piping and flanges in the first passage 230 (transfer passage 231, second divided passage 231b), or other equipment may be damaged. For this reason, the pressure relief valve 290 opens when the pressure in the second divided passage 231b (pressure on the inlet side of the pressure relief valve 290) exceeds a predetermined pressure value, and releases the pressure in the second divided passage 231b to the third divided passage 231c via the second passage 280. Specifically, fuel F4, which is part of the fuel in the second divided passage 231b, is sent to the third divided passage 231c via the pressure relief valve 290 and the second passage 280.

[0057] [4. Explanation of Effects] As described above, according to the internal combustion engine system 10 of this embodiment, a pressure relief valve 290 is positioned in a second flow path 280 that branches off from between the check valve 270 and the on-off valve 260 in the first flow path 230 connecting the storage tank 210 and the small discharge tank 220. The second flow path 280 is connected to a position in the first flow path 230 that is different from the position between the check valve 270 and the on-off valve 260. As a result, even if the on-off valve 260 closes and the pressure between the on-off valve 260 and the check valve 270 in the first flow path 230 rises, the pressure relief valve 290 can release the pressure from the second flow path 280 to a position different from the position between the check valve 270 and the on-off valve 260 in the first flow path 230. Therefore, damage to components located in the first flow path 230, which is the fuel flow path connecting the storage tank 210 and the small discharge tank 220, such as the on-off valve 260, the check valve 270, the piping and flanges in the first flow path 230 (transfer flow path 231, second divided flow path 231b), or other equipment, can be suppressed.

[0058] Instead of releasing pressure from the second passage 280 to the outside of the first passage 230, the fuel in the second passage 280 can be returned to the first passage 230 by connecting the second passage 280 to a position different from the check valve 270 and the on-off valve 260 in the first passage 230 and releasing the pressure into the first passage 230. Instead of connecting the second passage 280 to the storage tank 210 and releasing the pressure into the storage tank 210, by connecting the second passage 280 to the first passage 230 and releasing the pressure into the first passage 230, it is unnecessary to modify the storage tank 210, and the pressure can be released with a simple configuration of connecting the second passage 280 to the first passage 230.

[0059] Furthermore, by connecting the second passage 280 between the on-off valve 260 and the small discharge tank 220 in the first passage 230, the pressure between the check valve 270 and the on-off valve 260 in the first passage 230 can be released to the small discharge tank 220 side of the first passage 230. This allows the fuel in the second passage 280 to be sent to the small discharge tank 220 side of the first passage 230, which is the direction of fuel travel. In addition, a check valve 212 is located at the outlet of the storage tank 210 in the first passage 230, preventing pressure from being released to the storage tank 210 side (downstream of the check valve 212). Therefore, by connecting the second passage 280 to the small discharge tank 220 side of the first passage 230, the pressure can be released to the small discharge tank 220 side of the first passage 230.

[0060] Furthermore, since the small discharge tank 220 is equipped with a pressure relief mechanism 221, the pressure that has escaped to the small discharge tank 220 via the second flow path 280 can be released from the small discharge tank 220 by the pressure relief mechanism 221.

[0061] Furthermore, since at least a portion of the section between the check valve 270 and the on-off valve 260 in the first flow path 230 is located outdoors, there is a risk that the flow path located outdoors may become hot and expand during the summer, causing the pressure to rise. For this reason, it is highly effective to release the pressure between the on-off valve 260 and the check valve 270 in the first flow path 230 through the second flow path 280 using the pressure relief valve 290.

[0062] Furthermore, a fuel transfer pump 240 is positioned between the storage tank 210 and the check valve 270 in the first flow path 230. This raises the risk that the check valve 270 and the on-off valve 260 may close while the pressure between them is increased by the transfer pump 240. Additionally, even after the on-off valve 260 has closed, the transfer pump 240 may continue to operate, potentially increasing the pressure between the check valve 270 and the on-off valve 260. In such cases, the pressure between the check valve 270 and the on-off valve 260 in the first flow path 230 can be released through the second flow path 280 by the pressure relief valve 290.

[0063] [5 Explanation of variations] Although the internal combustion engine system 10 according to this embodiment has been described above, the present invention is not limited to the above embodiment. The embodiments disclosed herein are illustrative and not restrictive in all respects, and the scope of the present invention includes all modifications in the sense and scope equivalent to the claims.

[0064] (Modifications 1 and 2) In the above embodiment, the second flow path 280 is connected to the space between the on-off valve 260 and the small discharge tank 220 in the first flow path 230 (the third divided flow path 231c of the transfer flow path 231), but it is not limited to this. The second flow path 280 can be connected to a position in the first flow path 230 that is different from the space between the check valve 270 and the on-off valve 260 (the second divided flow path 231b of the transfer flow path 231). Several cases can be exemplified in this case, but a representative example will be described in detail below.

[0065] Figure 5 is a schematic diagram showing the configuration of the first channel 230 and its surroundings according to Modification 1 of this embodiment. Figure 6 is a schematic diagram showing the configuration of the first channel 230 and its surroundings according to Modification 2 of this embodiment. Figures 5 and 6 are diagrams corresponding to Figure 3, with the connection destination of the second channel 280 in Figure 3 changed.

[0066] As shown in Figure 5, in Modification 1, a second flow path 281 is provided instead of the second flow path 280 in the above embodiment. The second flow path 281 is connected to the overflow flow path 232 of the first flow path 230. That is, one end of the second flow path 281 is connected to the second divided flow path 231b, and the other end is connected to the overflow flow path 232. In Figure 5, the second flow path 281 is connected to a position close to the small discharge tank 220 in the overflow flow path 232, but it may also be connected to a position close to the storage tank 210 in the overflow flow path 232, or it may be connected to the central part of the overflow flow path 232. The other configurations of this Modification are the same as in the above embodiment, so their explanation is omitted.

[0067] In this modified example, the same effects as in the above embodiment can be achieved. In particular, in this modified example, the second flow path 281 is connected to an overflow flow path 232 that returns the fuel overflowing from the small discharge tank 220 to the storage tank 210. As a result, the pressure in the first flow path 230 can be released through the second flow path 281 using the overflow flow path 232 provided in the small discharge tank 220.

[0068] As shown in Figure 6, in Modification 2, a second flow path 282 is provided instead of the second flow path 280 in the above embodiment. The second flow path 282 is connected between the storage tank 210 and the check valve 212 in the first flow path 230. In other words, one end of the second flow path 282 is connected to the second divided flow path 231b, and the other end is connected between the storage tank 210 and the check valve 212 in the first divided flow path 231a of the transfer flow path 231. In order to prevent fuel from flowing from the first divided flow path 231a to the second flow path 282 when the transfer pump 240 is driven, a check valve or the like may be provided before the connection point between the second flow path 282 and the first divided flow path 231a. The other configurations of this Modification are the same as in the above embodiment, so their explanation is omitted.

[0069] In this modified example, the same effects as in the above embodiment can be achieved. In particular, in this modified example, the second flow path 282 is connected between the storage tank 210 and the check valve 212 in the first flow path 230. This allows the pressure in the second divided flow path 231b in the first flow path 230 to be released to the storage tank 210 side via the second flow path 282. Furthermore, since the storage tank 210 is equipped with a pressure relief mechanism 211, the pressure that has escaped to the storage tank 210 via the second flow path 282 can be released from the storage tank 210 by the pressure relief mechanism 211.

[0070] (Variation 3) In the above embodiment, the transfer pump 240 is positioned between the storage tank 210 and the check valve 270 in the first flow path 230, but it is not limited to this. The transfer pump 240 may also be positioned between the on-off valve 260 and the small discharge tank 220 in the first flow path 230. Figure 7 is a schematic diagram showing the configuration of the first flow path 230 and its surroundings according to modification 3 of this embodiment. Figure 7 is a diagram corresponding to Figure 3, with the position of the transfer pump 240 changed from that in Figure 3.

[0071] As shown in Figure 7, in this modified example, the positions of the transfer pump 240 and the check valve 270 in the above embodiment are changed from between the storage tank 210 and the check valve 270 in the first flow path 230 to between the on-off valve 260 and the small discharge tank 220 in the first flow path 230. As a result, the on-off valve 260 and the pair of manual valves 261 are positioned upstream of the transfer pump 240 in the transfer flow path 231 of the first flow path 230 (between the storage tank 210 and the transfer pump 240). The second flow path 280 branches off from between the check valve 212 and the on-off valve 260 in the first flow path 230 and is connected to a different position in the first flow path 230 than between the check valve 212 and the on-off valve 260. In this modified example, at least a portion of the area between the check valve 212 and the on-off valve 260 in the first flow path 230 is located outdoors.

[0072] Specifically, the second flow path 280 is connected between the on-off valve 260 and the transfer pump 240 in the transfer flow path 231 of the first flow path 230. As a result, the second flow path 280 and the pressure relief valve 290 are positioned upstream of the transfer pump 240 in the transfer flow path 231 of the first flow path 230 (between the storage tank 210 and the transfer pump 240). The second flow path 280 may be connected at any position in the first flow path 230 other than between the check valve 212 and the on-off valve 260, and various modifications in the above modified examples 1 and 2 can be applied. Specifically, the second flow path 280 may be connected downstream of the transfer pump 240 in the transfer flow path 231, or connected to the overflow flow path 232, or connected between the storage tank 210 and the check valve 212 in the transfer flow path 231. The other configurations of this modified example are the same as in the above embodiment, so their description is omitted.

[0073] In this modified example, the same effects as in the above embodiment can be achieved. As in this modified example, the positional relationship between the transfer pump 240 and the on-off valve 260 (second flow path 280 and pressure relief valve 290) can be changed, thus improving the flexibility of the equipment configuration.

[0074] (Modifications 4 and 5) In the above embodiment, the internal combustion engine system 10 is provided with one storage tank 210 and one discharge tank 220, but it is not limited to this. The internal combustion engine system 10 may be provided with multiple discharge tanks 220 or multiple storage tanks 210. Figure 8 is a schematic diagram showing the configuration of the first flow path 230 and its surroundings according to modification 4 of this embodiment. Figure 9 is a schematic diagram showing the configuration of the first flow path 230 and its surroundings according to modification 5 of this embodiment. Figures 8 and 9 are diagrams corresponding to Figure 3, with the number of discharge tanks 220 or the number of storage tanks 210 changed from Figure 3.

[0075] As shown in Figure 8, in Modification 4, the internal combustion engine system 10 is equipped with a plurality of small discharge tanks 220, and an on-off valve 260 and a check valve 270 are arranged in each of the plurality of first flow paths 230 connected to the plurality of small discharge tanks 220 (a plurality of first flow paths 230 connecting the storage tank 210 and the plurality of small discharge tanks 220). A pressure relief valve 290 is arranged in the second flow path 280 that branches off from each of the first flow paths 230. Specifically, in this Modification, the internal combustion engine system 10 is equipped with two small discharge tanks 220a and 220b. An on-off valve 260, a pair of manual valves 261, a check valve 270, and a second flow path 280 are arranged in each of the two transfer flow paths 231 connecting one storage tank 210 and the two small discharge tanks 220a and 220b, and a pressure relief valve 290 is arranged in each of the second flow paths 280.

[0076] In this modified example, the two transfer channels 231 merge between the transfer pump 240 and the check valve 270 and are connected to the storage tank 210, but each of the two transfer channels 231 may be connected to the storage tank 210 without merging. In this case, the transfer pump 240 and the check valve 212 are arranged in each of the two transfer channels 231. In this modified example, the two overflow channels 232 merge midway and are connected to the storage tank 210, but each of the two overflow channels 232 may be connected to the storage tank 210 without merging. Various modifications from the above modified examples 1 to 3 may be applied to this modified example. The other configurations of this modified example are the same as those of the above embodiment, so their description is omitted.

[0077] In this modified example, the same effects as in the above embodiment can be achieved. In particular, in this modified example, the internal combustion engine system 10 is equipped with multiple small discharge tanks 220 (220a and 220b), so that the on-off valve 260 of the first flow path 230 connected to the small discharge tank 220 that is not selected to receive fuel (small discharge tank 220a in Figure 8) is closed. Even if small discharge tank 220a is not selected as a fuel supply destination, it is necessary to maintain a situation in which the internal combustion engine 100 connected to small discharge tank 220b can operate. When multiple small discharge tanks 220 are arranged, for example, if the operator selects small discharge tank 220b as the fuel supply destination, the system is controlled to send an open instruction signal to the on-off valve 260 of the first flow path 230 connected to the selected small discharge tank 220b. In this case, a close instruction signal is sent to the on-off valve 260 of the first flow path 230 connected to the unselected small discharge tank 220a, and no fuel is supplied to small discharge tank 220a. As a result, there is a risk that the pressure between the on-off valve 260 and the check valve 270 in the first flow path 230, which is connected to the small discharge tank 220 (220a) that does not receive fuel by selection, may rise, but the pressure can be released from the second flow path 280 by the pressure relief valve 290.

[0078] As shown in Figure 9, in Modification 5, the internal combustion engine system 10 is equipped with a plurality of storage tanks 210, and an on-off valve 260 and a check valve 270 are arranged in each of the plurality of first flow paths 230 connected to the plurality of storage tanks 210 (a plurality of first flow paths 230 connecting the plurality of storage tanks 210 and the small discharge tank 220). A pressure relief valve 290 is arranged in the second flow path 280 that branches off from each of the first flow paths 230. Specifically, in this Modification, the internal combustion engine system 10 is equipped with two storage tanks 210a and 210b. An on-off valve 260, a pair of manual valves 261, a check valve 270, and a second flow path 280 are arranged in each of the two transfer flow paths 231 that connect the two storage tanks 210a and 210b and one small discharge tank 220, and a pressure relief valve 290 is arranged in each of the second flow paths 280.

[0079] In this modified example, the storage tank 210a is an underground tank, similar to the storage tank 210 in the above embodiment, and the storage tank 210b is an above-ground tank. Note that the storage tank 210a may be above ground, or the storage tank 210b may be underground. In this modified example, the two transfer channels 231 merge before the discharge tank 220 and are connected to the discharge tank 220, but the two transfer channels 231 may be connected to the discharge tank 220 separately without merging. In this modified example, the two first channels 230 are provided with a common overflow channel 232. In this modified example, various modifications from the above modified examples 1 to 4 may be applied. The other configurations of this modified example are the same as in the above embodiment, so their description is omitted.

[0080] In this modified example, the same effects as in the above embodiment can be achieved. In particular, in this modified example, the internal combustion engine system 10 is equipped with multiple storage tanks 210 (210a and 210b), so that the on-off valve 260 of the first flow path 230 connected to the storage tank 210 that is not selected to receive fuel (storage tank 210a in Figure 9) is closed. Even if storage tank 210a is not selected as a fuel source, it is necessary to maintain a situation in which the internal combustion engine 100 can operate. When multiple storage tanks 210 are arranged, for example, if the operator selects storage tank 210b as a fuel source, the system is controlled to send an open instruction signal to the on-off valve 260 of the first flow path 230 connected to the selected storage tank 210b. In this case, a close instruction signal is sent to the on-off valve 260 of the first flow path 230 connected to the unselected storage tank 210a, and fuel is not supplied from storage tank 210a. As a result, there is a risk that the pressure between the on-off valve 260 and the check valve 270 in the first flow path 230 connected to the storage tank 210 (210a) that is not supplied with fuel by selection may rise, but the pressure relief valve 290 can release the pressure through the second flow path 280.

[0081] The internal combustion engine system 10 includes both a plurality of storage tanks 210 and a plurality of dispensing tanks 220, and a plurality of first flow paths 230 may be provided for the plurality of storage tanks 210 and the plurality of dispensing tanks 220. In other words, the internal combustion engine system 10 includes at least one of the plurality of storage tanks 210 and the plurality of dispensing tanks 220, and an on-off valve 260 and a check valve 270 are arranged in each of the plurality of first flow paths 230 connected to at least one of the plurality of storage tanks 210 and the plurality of dispensing tanks 220, and a pressure relief valve 290 may be arranged in a second flow path 280 branching from each first flow path 230. As a result, even if the pressure between the on-off valve 260 and the check valve 270 in the first flow path 230 connected to a storage tank 210 or dispensing tank 220 that is not supplied with fuel by selection rises, the pressure relief valve 290 can release the pressure through the second flow path 280.

[0082] (Other variations) In the above embodiment, the internal combustion engine 100 provided in the internal combustion engine system 10 is assumed to be a diesel engine that uses heavy oil or light oil as fuel, but it is not limited to this. The internal combustion engine 100 may be a gasoline engine that uses gasoline as fuel. The internal combustion engine 100 may be a gas engine that uses natural gas, city gas, or a gas obtained by vaporizing liquefied natural gas (LNG) or liquid hydrogen as fuel. The internal combustion engine 100 is not limited to an engine, and may be a gas turbine that burns the above gas to rotate a turbine, or it may be any other known internal combustion engine.

[0083] In the above embodiment, the internal combustion engine system 10 is equipped with a drainage facility 400, and the internal combustion engine 100 drives the drainage pump. However, the internal combustion engine system 10 does not necessarily have to be equipped with a drainage facility 400. In this case, the internal combustion engine system 10 may be equipped with equipment other than the drainage facility 400 (a pump other than the drainage pump, a propeller for a ship, an emergency or regular generator, for example, a generator installed in a data center), and may drive such equipment.

[0084] In the above embodiment, the pressure relief valve 290 is configured to open mechanically (automatically) when the pressure on the inlet side exceeds a predetermined pressure value. However, the invention is not limited to this configuration, and a control unit may be provided to control the opening of the pressure relief valve 290. In other words, the control unit may acquire the pressure in the second divided flow path 231b, determine whether the pressure exceeds a predetermined pressure value, and, if it determines that the pressure exceeds a predetermined pressure value, control the pressure relief valve 290 to open.

[0085] In the above embodiment, the storage tank 210 is provided with a pressure relief mechanism 211, but it is not required to have a pressure relief mechanism 211. The dispensing tank 220 is provided with a pressure relief mechanism 221, but it is not required to have a pressure relief mechanism 221.

[0086] In the above embodiment, the first flow path 230 is provided with an overflow flow path 232, but it is not necessary to provide an overflow flow path 232. In other words, if the size of the small dispensing tank 220 is sufficiently large and there is no risk of overflow, the overflow flow path 232 may not be provided. Alternatively, instead of the overflow flow path 232, a flow path may be provided to send the overflow from the small dispensing tank 220 to a tank other than the storage tank 210.

[0087] In the above embodiment, at least a portion of the section between the check valve 270 and the on-off valve 260 in the first flow path 230 is located outdoors. However, the entire section between the check valve 270 and the on-off valve 260 in the first flow path 230 may be located indoors. For example, if at least a portion of the section between the check valve 270 and the on-off valve 260 in the first flow path 230 is located near a boiler or other heat source, the flow path may become hot, expand, and cause the pressure to rise. Therefore, regardless of whether at least a portion of the section is located outdoors or not, the pressure in the flow path may rise, and in this case, the effect of releasing the pressure with the pressure relief valve 290 is significant.

[0088] In the above embodiment, the transfer pump 240 is positioned between the storage tank 210 and the dispensing tank 220 in the first flow path 230. However, the transfer pump 240 may not be positioned if the storage tank 210 is positioned higher than the dispensing tank 220, for example. In the above embodiment, a pump for transferring fuel may be positioned in the overflow flow path 232 or the fuel flow path 250.

[0089] In the above embodiment, a check valve 212 is not required to be placed at the outlet of the storage tank 210 in the first flow path 230. A pair of manual valves 261 are not required to be placed before and after the on-off valve 260 in the first flow path 230.

[0090] In this embodiment, the air generating unit 310 and the air tank 330 are separate units. However, if the air generated by the air generating unit 310 is low-pressure air, the air generating unit 310 and the air tank 330 may be integrated. Alternatively, the internal combustion engine system 10 does not need to include the air generating unit 310, etc. In other words, the internal combustion engine 100 is not limited to being started by starting air, but may also be started by the power of a motor, etc.

[0091] Forms constructed by combining any of the components in the above embodiments and their variations are also included within the scope of the present invention. [Industrial applicability]

[0092] This invention can be applied to an internal combustion engine system that supplies fuel to an internal combustion engine. [Explanation of Symbols]

[0093] 10 Internal Combustion Engine Systems 100 Internal Combustion Engine 110 Combustion chamber 111 First rotation axis 112 Cylinder 113 Pistons 114 Connecting rod 115 Crank Axle 120 Reducer 121 Second rotation axis 130 Silencer 131 Exhaust passage 210, 210a, 210b storage tanks 211, 221 Pressure relief mechanism 212, 270 Check valve 220, 220a, 220b Dispensing tank 230 First channel 231 Transfer channel 231a First divided channel 231b Second divided channel 231c Third divided channel 232 Overflow channel 240 Transfer pump 250 Fuel passage 260 Shut-off valve 261 Manual valve 280, 281, 282 Second flow path 290 Pressure relief valve 310 Air generation unit 320 Airflow channel 330 Air Tank 340 Air supply unit 350 Intake passage 400 Drainage equipment A1 Starting air A2 Combustion air A3 Exhaust F1, F2, F3, F4 fuel W water

Claims

1. A storage tank where fuel is stored, A small discharge tank connected to an internal combustion engine, A first flow path which is the fuel flow path connecting the storage tank and the small discharge tank, A shut-off valve arranged in the first flow path, A check valve is disposed between the storage tank and the on / off valve in the first flow path, The system includes a pressure relief valve located in a second flow path that branches off from between the check valve and the on / off valve in the first flow path, The second flow path is connected to a position in the first flow path that is different from the position between the check valve and the on / off valve. Internal combustion engine system.

2. The second channel is connected between the on / off valve and the small discharge tank in the first channel. The internal combustion engine system according to claim 1.

3. The aforementioned small dispensing tank is equipped with a pressure relief mechanism. The internal combustion engine system according to claim 2.

4. The first channel is, A transfer channel is a channel for transferring the fuel from the storage tank to the small discharge tank, The system includes an overflow channel which is a channel for returning the fuel that overflows from the small discharge tank back to the storage tank, The second channel is connected to the overflow channel. The internal combustion engine system according to claim 1.

5. The system comprises at least one of the multiple storage tanks and the multiple dispensing tanks, Each of the multiple first flow channels connected to at least one of the multiple storage tanks and the multiple dispensing tanks is equipped with an on-off valve and a check valve, and each of the second flow channels branching off from each of the first flow channels is equipped with a pressure relief valve. An internal combustion engine system according to any one of claims 1 to 4.

6. At least a portion of the first flow path between the check valve and the on / off valve is located outdoors. An internal combustion engine system according to any one of claims 1 to 4.

7. The first flow path is further provided with a transfer pump positioned between the storage tank and the check valve for transferring the fuel. An internal combustion engine system according to any one of claims 1 to 4.

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