Hydrofoil

Abstract

To provide a hydrofoil ship configured so as to be able to easily supply water to a water using device even during sailing.SOLUTION: This hydrofoil ship comprises: a hull; a strut projecting downward from the hull; a hydrofoil horizontally extending from the lower part of the strut; a main flow path passing through the inside of the strut and extending from a water inlet disposed in the lower part of the strut to an injection outlet disposed in the rear part of the hull; a water jet pump having an impeller capable of pressurizing water introduced from the water inlet to the main flow path toward the injection outlet; a sub-flow path branching from the main flow path and extending to a discharge outlet; and a water using device disposed on the sub-flow path.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a hydrofoil vessel that runs on the propulsion force of a water jet pump. [Background technology]

[0002] A hydrofoil vessel travels with its hull on the water at low speeds, and travels with its hull raised by the lifting force acting on hydrofoils arranged below the hull at high speeds (see, for example, Patent Documents 1 and 2). The hull is fitted with a heat exchanger that uses seawater, a fire hydrant to which seawater is supplied for extinguishing fires, and other devices. Seawater from around the hydrofoil vessel is pumped up by a pump through an opening in the hull and supplied to water-using equipment such as the heat exchanger and fire hydrant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 6-25100 [Patent Document 2] Japanese Utility Model Application Publication No. 7-35299 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a hydrofoil vessel runs on its wings, using the lift acting on the hydrofoils to raise the hull, the hull is positioned above the seawater surface and the hull openings do not land on the water, so seawater cannot be pumped up when the vessel runs on its wings.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a configuration for a hydrofoil ship that can easily supply water to water-utilizing equipment even when the foils are moving. [Means for solving the problem]

[0006] A hydrofoil vessel according to one embodiment of the present invention comprises a hull, a strut protruding downward from the hull, a hydrofoil extending laterally from the lower part of the strut, a main flow path passing inside the strut and extending from a water intake located at the lower part of the strut to a jet nozzle located at the rear of the hull, a water jet pump having an impeller capable of pressurizing water introduced into the main flow path from the water intake toward the jet nozzle, at least one secondary flow path branching off from the main flow path and extending to a discharge outlet, and at least one water-utilization device arranged in the at least one secondary flow path.

[0007] With this configuration, water can be easily supplied to the water-using equipment through the sub-flow passage branched off from the main flow passage even during blade flight. Moreover, since water can be supplied to the water-using equipment using the pressure of the main flow passage, the energy consumption required to supply water to the water-using equipment can be reduced. Effect of the Invention

[0008] According to the present invention, even during blade travel, water can be easily supplied to water-using equipment by the sub-flow passage branched off from the main flow passage, and energy consumption can be reduced. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a partially cutaway perspective view of a hydrofoil ship according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram of the water flow system of the hydrofoil vessel of FIG. [Diagram 3] FIG. 3 is a block diagram of a control system for the discharge pump and heater in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment will be described with reference to the drawings.

[0011] Fig. 1 is a partially cutaway perspective view of a hydrofoil boat 1 according to an embodiment. As shown in Fig. 1, the hydrofoil boat 1 comprises a hull 2 ​​having a hull 3 and a deck 4. The hull 3 has a ship bottom surface 3a. A cabin body 5 is provided on the deck 4 so as to protrude upward from the deck 4. A passenger cabin S is provided inside the cabin body 5.

[0012] The hydrofoil vessel 1 comprises a front strut 6, a front hydrofoil 7, a rear strut 8 and a rear hydrofoil 9. The front strut 6 protrudes downward from the bottom of the bow side of the hull 2. The front strut 6 is rotatable around a vertical axis and functions as a rudder. The front hydrofoil 7 is connected to a lower part of the front strut 6 and extends in the left-right direction. The front hydrofoil 7 has a wing body 7a and a flap 7b provided on the rear side of the wing body 7a. The front part of the flap 7b is connected to the wing body 7a so as to be rotatable around an axis extending in the left-right direction, and the flap 7b is configured to be swingable to change the angle of attack.

[0013] The rear strut 8 protrudes downward from the bottom of the stern side of the hull 2. The rear hydrofoil 9 is connected to a lower part of the rear strut 8 and extends in the left-right direction. The rear hydrofoil 9 has a wing body 9a and a flap 9b provided on the rear side of the wing body 9a. The front part of the flap 9b is connected to the wing body 9a so as to be rotatable around an axis extending in the left-right direction, and the flap 9b is configured to be swingable so as to change the angle of elevation. The front strut 6 can swing forward so that the front hydrofoil 7 moves to a retracted position diagonally forward and upward, and the rear strut 8 can swing rearward so that the rear hydrofoil 9 moves to a retracted position diagonally rearward and upward.

[0014] A water intake duct 10 extending in the vertical direction passes through the inside of the rear strut 8. A water intake port 10a of the water intake duct 10 is open to the outside of the rear strut 8 at the lower part of the rear strut 8 and opens forward. The outlet of the water intake duct 10 is connected to the inlet of a water jet pump 11 arranged inside the hull 2. A jet port 12a that opens rearward is provided at the rear end of the water jet pump 11. The water jet pump 11 generates propulsive force by jetting seawater that flows in from the water intake duct 10 from the jet port 12a toward the rear of the hull 2.

[0015] The driving force of a prime mover 14, which is an internal combustion engine or an electric motor, is transmitted to the water jet pump 11 via a reduction gear 15. That is, the water jet pump 11 operates in conjunction with the prime mover 14. In this embodiment, the prime mover 14 is a gas turbine engine, which is a type of internal combustion engine (hereinafter, reference numeral 14 will be referred to as the engine). Exhaust gas from the engine 14 is discharged overboard via an exhaust duct 16.

[0016] At low speeds, the hydrofoil ship 1 runs with the bottom surface 3a of the hull 2 ​​resting on the water (boat running).At high speeds, the hydrofoil ship 1 runs with the bottom surface 3a of the hull 2 ​​raised above the seawater surface by lift acting on the front hydrofoil 7 and the rear hydrofoil 9 arranged below the hull 2 ​​(foil running).

[0017] Fig. 2 is a schematic diagram of a water distribution system of the hydrofoil ship 1 of Fig. 1. As shown in Fig. 2, the water intake duct 10 and the pump casing 12 define a main flow path 30 extending from the water intake port 10a of the water intake duct 10 to the jet port 12a of the pump casing 12. The water jet pump 11 has an impeller 13 capable of pressurizing seawater introduced from the water intake port 10a into the main flow path 30 toward the jet port 12a. The impeller 13 is rotated by a driving force transmitted from the engine 14 via a reduction gear 15.

[0018] A branch port 10b (branch point) is provided in the water intake duct 10 upstream of the impeller 13, and the first pipe 21 branches off from the water intake duct 10 at the branch port 10b. The first pipe 21 defines a first sub-flow passage 31 that branches off from the main flow passage 30 upstream of the impeller 13 and extends to an outlet 31a. In the first sub-flow passage 31, first heat exchangers 46, 53, 54 and a fire hydrant 55 are disposed as first water-using equipment. The outlet 31a is open to the atmosphere. The outlet 31a may be a plurality of outlets provided individually for each of the heat exchangers 46, 53, 54, or may be a common outlet for each of the heat exchangers 46, 53, 54. In addition, a plurality of first water-using equipment are disposed in the first sub-flow passage 31, but only one may be disposed.

[0019] An electric discharge pump 41 is provided in the first sub-flow path 31. The discharge pump 41 is configured to discharge seawater introduced from the main flow path 30 into the first sub-flow path 31 toward the heat exchangers 46, 53, 54 and the fire hydrant 55. The operation and stop of the discharge pump 41, and the rotation speed of the discharge pump 41 during operation are controlled by a controller 70 described later.

[0020] A filter device 42 is provided in the first sub-flow path 31 upstream of the discharge pump 41. The filter device 42 has a filter element 44 that filters seawater by allowing it to pass through, and a filter casing 43 that houses the filter element 44. A maintenance opening 43a through which the filter element 44 can be inserted and removed is provided in the upper part of the filter casing 43. The maintenance opening 43a is closed by a lid 45 so as to be able to be opened and closed.

[0021] The first sub-path 31 branches toward the heat exchangers 46, 53, 54 and the fire hydrant 55 at a branch point 31b downstream of the discharge pump 41. That is, the heat exchangers 46, 53, 54 and the fire hydrant 55 are arranged in parallel with each other in the first sub-path 31. The first heat exchanger 46 is for indirectly exchanging heat with a refrigerant of an air conditioner 59. The first heat exchanger 53 is for exchanging heat with hydraulic oil of a hydraulic device. The first heat exchanger 54 is for exchanging heat with a refrigerant that cools a generator.

[0022] The air conditioner indoor unit 47 is disposed in the passenger cabin S. The air conditioner outdoor unit 48 is disposed within the hull 2 ​​below the deck 4. A refrigerant loop 49 for circulating a refrigerant is provided between the air conditioner indoor unit 47 and the air conditioner outdoor unit 48. A circulation loop 50 for circulating a fluid as a heat medium is provided between the air conditioner outdoor unit 48 and the first heat exchanger 46. The fluid flowing through the circulation loop 50 is, for example, fresh water, but may be another fluid such as a fluorocarbon refrigerant.

[0023] The circulation loop 50 is provided with a circulation pump 51 that circulates the fluid. The circulation loop 50 is provided with a heater 52 that can heat the fluid flowing through the circulation loop 50. The first heat exchanger 46 exchanges heat between the seawater flowing through the first sub-passage 31 and the fluid flowing through the circulation loop 50. An electrically operated shutoff valve 56 is provided in the passage of the first sub-passage 31 downstream of the branch point 31b in which the first heat exchanger 46 is disposed. The ON / OFF of the heater 52 and the opening and closing of the shutoff valve 56 are controlled by a controller 70, which will be described later.

[0024] A pressure sensor 57 is provided as a first sensor in the first sub-passage 31 downstream of the discharge pump 41. The pressure sensor 57 detects the pressure of seawater discharged by the discharge pump 41. A flow rate sensor capable of measuring the flow rate of seawater discharged by the discharge pump 41 may be used as the first sensor instead of or together with the pressure sensor 57. Since the pressure or flow rate of seawater introduced from the intake 10a to the first sub-passage 31 correlates with the ship speed, a ship speed sensor may be used as the first sensor capable of detecting a physical quantity correlated with the pressure or flow rate of seawater discharged by the discharge pump 41.

[0025] A temperature sensor 58A is provided as a second sensor in the circulation loop 50. The temperature sensor 58A detects the temperature of the fluid flowing through the circulation loop 50. As the second sensor that detects a physical quantity correlated with the temperature of the fluid flowing through the circulation loop 50, a temperature sensor that detects the piping temperature of the circulation loop 50 may be used, or a temperature sensor that detects the temperature of the first sub-flow path 31 may be used. Either the first sensor (pressure sensor 57) or the second sensor (temperature sensor 58A) may be omitted.

[0026] A temperature sensor 58B serving as a second sensor is provided on the piping connected to the first heat exchanger 53 to detect the temperature of a heat exchange target (hydraulic oil for hydraulic equipment) of the first heat exchanger 53. A temperature sensor 58C serving as a second sensor is provided on the piping connected to the first heat exchanger 54 to detect the temperature of a heat exchange target (cooling fluid for the generator) of the first heat exchanger 54.

[0027] The height of various equipment arranged inside the hull 2 ​​is determined based on the waterline. The waterline of the hydrofoil ship 1 when the hull 2 ​​is landed on water and anchored is the light waterline L1. Light and the load line L1 Load The light waterline L1 can move up and down between the Light means the waterline when the hydrofoil vessel 1 is floating on the water in an unladen state without passengers, cargo, fuel oil, etc. Loadmeans the waterline when the hydrofoil ship 1 is floating on the water with a full load of people, cargo, etc. The waterline when the hydrofoil ship 1 is traveling at a low speed with the hull 2 ​​ashore is the same as when it is anchored.

[0028] The waterline of the hydrofoil ship 1, which is running with the hull 2 ​​floating above the seawater surface, is the lowest waterline L2 due to the swinging of the flaps 7b, 9b of the hydrofoils 7, 9. Min and maximum waterline L2 Max The flaps 7b, 9b can change the angle of attack by the driving force of an actuator operated by the pilot, thereby changing the lift (and drag) acting on the hydrofoils 7, 9. The lower limit of the swing range of the flaps 7b, 9b is the lowest waterline L2 Min The upper limit of the swing range of the flaps 7b and 9b corresponds to the maximum waterline L2. Max Corresponds to.

[0029] The point where the first sub-channel 31 branches off from the main channel 30 (the branch port 10b) is located at the highest waterline L2 of the hydrofoil ship 1 when the hydrofoil is traveling. Max Specifically, the point where the first sub-passage 31 branches off from the main passage 30 (the branch port 10b) is disposed inside the hull 2. The discharge pump 41 is disposed above the light draft line L1 Light The portion of the first sub-passage 31 upstream of the discharge pump 41 is also located below the light draft line L1 Light The maintenance opening 43a of the filter device 42 is located at a position lower than the light waterline L1. Light The heat exchangers 46, 53, 54 and the fire hydrant 55 are arranged so as to be higher than the load waterline L1. Load The entire first sub-channel 31 is disposed so as to be higher than the lowest waterline L2 of the hydrofoil ship 1 when the hydrofoil is traveling. Min The height of the intake 10a is lower than the height of the intake 10b plus the dynamic pressure head H1 of the intake 10a.

[0030] A branch port 12b is provided in a downstream portion of the impeller 13 of the pump casing 12 of the water jet pump 11, and a second pipe 22 branches off from the pump casing 12 at the branch port 12b. The second pipe 22 defines a second sub-passage 32 that branches off from a downstream portion of the impeller 13 of the main passage 30 and extends to an outlet 32a. A second heat exchanger 61 is disposed in the second sub-passage 32 as a second water-using device. The outlet 32a is open to the atmosphere. Although the first sub-passage 31 and the second sub-passage 32 branch off from the main passage 30, only one of the first sub-passage 31 or the second sub-passage 32 may be provided.

[0031] The second heat exchanger 61 cools the liquid that lubricates or cools the engine 14 and the reducer 15 by exchanging heat between the liquid and seawater flowing through the second sub-passage 32. The liquid is, for example, lubricating oil that lubricates the bearings of the gas turbine engine 14. The engine 14 and the reducer 15 are examples of heat-generating devices that generate heat by operating in conjunction with the water jet pump 11. In the case where the engine 14 is a reciprocating engine, the liquid may be cooling water flowing through a water jacket of the engine 14. Seawater flows through the second sub-passage 32 only due to the pressure downstream of the impeller 13 in the main passage 30. That is, no pump for passing seawater is disposed in the second sub-passage 32.

[0032] The point where the second sub-channel 32 branches off from the main channel 30 (the branch port 12b) is located at the highest waterline L2 of the hydrofoil ship 1 when the hydrofoil is traveling. Max The second heat exchanger 61 is disposed so as to be higher than the load waterline L1. The point where the second sub-flow passage 32 branches off from the main flow passage 30 (branch port 12b) is disposed inside the hull 2. Load The second heat exchanger 61 is disposed so as to be higher than the light draft waterline L1 of the hydrofoil vessel 1 during idling operation. LightThe height H2 of the water jet pump 11 is lower than the height H2 obtained by adding the discharge head of the water jet pump 11 to the height H2 of the water jet pump 11. The idling operation of the hydrofoil vessel 1 means a state in which the water jet pump 11 is operated at the minimum rotation speed at which the engine 14 can operate stably, and a reverser arranged behind the nozzle 12a of the water jet pump 11 redirects part of the jet from the nozzle 12a forward to cancel the propulsive force.

[0033] Fig. 3 is a block diagram of a control system for the discharge pump 41 and heater 52 in Fig. 2. As shown in Fig. 3, the hydrofoil ship 1 is equipped with a controller 70. The controller 70 has a memory in which a predetermined program is stored, a processor that performs calculations according to the program, and an input / output interface. The pressure sensor 57, the temperature sensor 58A, and the air conditioner 59 are electrically connected to the input side of the controller 70. The discharge pump 41, the heater 52, and the shutoff valve 56 are electrically connected to the output side of the controller 70.

[0034] The controller 70 controls the operation and stop of the discharge pump 41 according to the detection signals of the pressure sensor 57 and the temperature sensors 58A-C and the required temperature signal of the air conditioner 59. The controller 70 may operate the discharge pump 41 when it is determined that the detected temperature of any one of the temperature sensors 58A-C is equal to or higher than a predetermined value, and may stop the discharge pump 41 when it is determined that all the detected temperatures of the temperature sensors 58A-C are lower than the predetermined value. The controller 70 may stop the discharge pump 41 when it is determined that the detected pressure (or flow rate) of the pressure sensor 57 is equal to or higher than a predetermined value, and may operate the discharge pump 41 when it is determined that the detected pressure (or flow rate) of the pressure sensor 57 is lower than the predetermined value. The controller 70 may open the shutoff valve 56 when it is determined that the detected temperature of the temperature sensor 58A is equal to or higher than a predetermined value, and may close the shutoff valve 56 when it is determined that the detected temperature of the temperature sensor 58A is lower than the predetermined value.

[0035] In this embodiment, when it is determined that the temperature detected by the temperature sensor 58A is equal to or higher than the target temperature required for the air conditioner 59 to achieve the required temperature, the controller 70 operates the discharge pump 41 with the shutoff valve 56 open. When the discharge pump 41 is operating, the controller 70 reduces the rotation speed of the discharge pump 41 as the deviation between the temperature detected by the temperature sensor 58A and the target temperature decreases. This minimizes the energy consumption when the discharge pump 41 is operating.

[0036] When it is determined that the temperature detected by the temperature sensor 58A is lower than the target temperature and the pressure detected by the pressure sensor 57 is equal to or higher than the lower limit, the controller 70 stops the discharge pump 41. At that time, the shutoff valve 56 may be open or closed. This prevents the fluid in the circulation loop 50 from being excessively cooled, and reduces the operating time of the discharge pump 41, thereby minimizing the energy consumption of the discharge pump 41.

[0037] When it is determined that the temperature detected by the temperature sensor 58A is lower than the target temperature and the pressure detected by the pressure sensor 57 is lower than the lower limit, the controller 70 closes the shutoff valve 56 and operates the discharge pump 41. This prevents the fluid in the circulation loop 50 from being cooled excessively, minimizes the energy consumption of the discharge pump 41, and maintains an appropriate supply of seawater to other water-using equipment (heat exchangers 53, 54) arranged in the first sub-flow path 31.

[0038] The controller 70 may turn on the heater 52 when it is determined that the temperature detected by the temperature sensor 58A is lower than the target temperature with the shutoff valve 56 closed, and may turn off the heater 52 otherwise. In this case, the controller 70 may turn on the heater 52 when it is determined that the deviation between the temperature detected by the temperature sensor 58A and the target temperature is greater than a predetermined value, and may turn off the heater 52 otherwise. This allows the temperature of the fluid in the circulation loop 50 to quickly approach the target temperature. For example, it becomes possible to use the air conditioner 59 for heating even when the seawater temperature is extremely low.

[0039] According to the configuration described above, the first sub-path 31 and the second sub-path 32 branch off from the middle of the main path 30. Therefore, it is not necessary to extend the first sub-path 31 and the second sub-path 32 to the outside of the hull 2, and seawater can be supplied to the first heat exchangers 46, 53, 54, the fire hydrant 55, and the second heat exchanger 61 by utilizing the pressure of the main path 30. Therefore, the configuration required to supply seawater to the water-using equipment in the hull 2 ​​can be simplified and energy consumption can be reduced.

[0040] In addition, the points where the first sub-channel 31 and the second sub-channel 32 branch off from the main channel 30 (branch ports 10b, 12b) are located at the highest waterline L2 Max Since the first sub-passage 31 and the second sub-passage 32 are disposed so as to be higher than the vessel body 2, it is possible to eliminate the need to extend the first sub-passage 31 and the second sub-passage 32 to the outside of the vessel body 2.

[0041] In addition, the pressure in the portion of the main flow path 30 upstream of the impeller 13 is a moderate pressure that includes the dynamic pressure of the seawater introduced from the water intake 10a and is not pressurized by the impeller 13, so that the pressure of the seawater supplied to the first heat exchanger 46, 53, 54 and the fire hydrant 55 can be adjusted by the discharge pump 41 and the energy required for the discharge pump 41 can be reduced.

[0042] The discharge pump 41 is located at the light waterline L1 Light Since the discharge pump 41 is disposed so as to be lower than the load, even when the hydrofoil ship 1 is anchored, water is prevented from dropping from the discharge pump 41 regardless of the loading state, and the discharge pump 41 can be easily restarted.

[0043] In addition, the portion of the first sub-passage 31 upstream of the discharge pump 41 is located at the light draft line L1 Light Since the hydrofoil vessel 1 is arranged to be lower than the discharge pump 41, air is prevented from entering the portion of the first sub-channel 31 upstream of the discharge pump 41 regardless of the loading state even when the hydrofoil vessel 1 is anchored, and the discharge pump 41 can be stably restarted.

[0044] In addition, the maintenance opening 43a of the filter device 42 is located at the light waterline L1 LightSince the lid 45 is positioned higher than the maintenance opening 43a, even if the lid 45 is removed and the maintenance opening 43a is opened when the hydrofoil vessel 1 is anchored in a light load state, water is prevented from overflowing from the maintenance opening 43a, and the task of closing the valve near the filter device 42 in the first secondary passage 31 is eliminated.

[0045] Furthermore, by controlling the discharge pump 41 in accordance with the temperature of the heat exchange target detected by the temperature sensors 58A to 58C (the required degree of achievement of heat exchange), the discharge pump 41 can be operated efficiently to achieve energy saving.

[0046] Furthermore, by controlling the discharge pump 41 in accordance with the pressure and / or flow rate downstream of the discharge pump 41 detected by the pressure sensor 57, the discharge pump 41 can be operated efficiently to achieve energy saving.

[0047] In addition, the circulation loop 50 formed between the first heat exchanger 46 and the air conditioner outdoor unit 48 absorbs the effects of pressure fluctuations in the first secondary flow path 31 on the air conditioner outdoor unit 48, thereby stabilizing the performance of the air conditioner outdoor unit 48.

[0048] In addition, since the heater 52 and the shutoff valve 56 are controlled according to the detection value of the temperature sensor 58A, when the temperature of the seawater taken in from the water intake 10a is lower than required, the heater 52 can heat the fluid flowing through the circulation loop 50, and fluid at an appropriate temperature can be provided to the air conditioning outdoor unit 48.

[0049] In addition, the entire first sub-channel 31 is located below the lowest waterline L2 of the hydrofoil ship 1 when the hydrofoil is traveling. Min Since the discharge pump 41 is arranged so as to be lower than the height H1 obtained by adding the dynamic pressure head of the intake port 10a to the height H1 of the discharge pump 41, seawater can be supplied to the first sub-channel 31 even if the discharge pump 41 is stopped during blade flight.

[0050] In addition, since the second sub-flow passage 32 branches off from a portion of the main flow passage 30 downstream of the impeller 13, seawater can be supplied to the second heat exchanger 61 by utilizing the high pressure downstream of the impeller 13. Therefore, seawater can be supplied to the second heat exchanger 61 provided in the second sub-flow passage 32 without providing a pump in the second sub-flow passage 32.

[0051] In addition, since a second heat exchanger 61 that cools the liquid that needs to be cooled when the engine 14 is operating is disposed in the second sub-flow passage 32, seawater guided to the second sub-flow passage 32 by the water jet pump 11 linked to the engine 14 can be effectively utilized.

[0052] In addition, the second heat exchanger 61 is connected to the hydrofoil vessel 1 at the light waterline L1 during idling operation. Light Since the height H2 of the second heat exchanger 61 is lower than the height H2 obtained by adding the discharge head of the water jet pump 11 to the height H2 of the second heat exchanger 61, when the hydrofoil vessel 1 is in an idling state, seawater is supplied to the second heat exchanger 61, and the second heat exchanger 61 can be effectively utilized.

[0053] In addition, the first heat exchangers 46, 53, 54 and the second heat exchanger 61 are arranged on the load waterline L1 of the hydrofoil ship 1 when the hydrofoil ship 1 is anchored. Load Since the first heat exchangers 46, 53, 54 and the second heat exchanger 61 are disposed so as to be higher than the above, water falls from the first heat exchangers 46, 53, 54 and the second heat exchanger 61 when the ship is anchored, etc., and adhesion of marine organisms to the heat exchangers can be suppressed.

[0054] (Other embodiments) As described above, the above embodiment has been described as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this, and can be applied to embodiments in which modifications, replacements, additions, omissions, etc. are appropriately performed. In addition, it is also possible to combine the components described in the above embodiment to form a new embodiment. In addition, among the components described in the attached drawings and detailed description, not only components essential for solving the problem but also components that are not essential for solving the problem in order to exemplify the technology may be included. Therefore, the fact that these non-essential components are described in the attached drawings and detailed description should not immediately be taken to mean that these non-essential components are essential.

[0055] For example, the first heat exchangers 46, 53, 54 may cool the liquid that lubricates or cools the engine 14 by exchanging heat between the liquid and seawater flowing through the second sub-flow passage 32. A discharge pump for passing seawater may be arranged in the second sub-flow passage 32, and a filter device may be arranged upstream of the discharge pump. The second heat exchanger 61 may be for indirectly exchanging heat with the refrigerant of the air conditioner 59, or for cooling hydraulic oil of a hydraulic device or a coolant of a generator. Furthermore, a fire hydrant may be provided as the second water-using device. Also, a pipe connecting the first sub-flow passage 31 and the second sub-flow passage 32 may be provided, and the discharge pump 41 may be stopped to supply seawater when the water jet pump 11 is operating. [Explanation of symbols]

[0056] 1 hydrofoil 2. Hull 10a Water intake 10b Branch port (branch point) 11 Water jet pump 12a Nozzle 13 Impeller 14 Engine (prime mover) 30 Main channel 31 1st sub-channel 31a Outlet 32 2nd sub-channel 32a Outlet 41 Discharge pump 42 Filter device 43 Filter casing 43a Maintenance opening 44 Filter element 46 1st heat exchanger (1st water usage equipment) 50 Circulation Loop 51 Circulation Pump 52 Heater 53 1st heat exchanger (1st water usage equipment) 54 1st heat exchanger (1st water usage equipment) 55 Fire hydrant (1st water usage equipment) 56 Shut-off valve 57 Pressure sensor (first sensor) 58A~C Temperature sensor (second sensor) 61 2nd heat exchanger (2nd water usage equipment) 70 Controller L1 Load Load line L1 Light Lightweight waterline L2 Max Highest waterline L2 Min Lowest waterline

Claims

1. The hull and A strut protruding downward from the hull; A hydrofoil extending in the left-right direction from a lower portion of the strut; A main flow path passing through the inside of the strut and extending from a water intake located at a lower part of the strut to a water outlet located at the rear of the hull; a water jet pump having an impeller capable of pressurizing water introduced from the water intake into the main flow path toward the water jet outlet; At least one secondary flow path branching off from the primary flow path and extending to an outlet; At least one water-using device disposed in the at least one secondary flow path; A discharge pump; A controller for controlling the discharge pump, The at least one sub-flow passage includes a first sub-flow passage branched off from a portion of the main flow passage upstream of the impeller, The at least one water-using device includes a first water-using device disposed in the first sub-flow path, The discharge pump is configured to discharge water introduced from the main flow path to the first sub-flow path toward the first water-using equipment.

2. 2. The hydrofoil vessel according to claim 1, wherein a point at which the secondary passage branches off from the main passage is arranged to be higher than a maximum waterline of the hydrofoil vessel when the hydrofoil is sailing.

3. 3. A hydrofoil vessel according to claim 1 or 2, wherein the discharge pump is arranged to be lower than the light draft of the hydrofoil vessel when at anchor.

4. 4. The hydrofoil vessel according to claim 1, wherein a portion of the first sub-channel upstream of the discharge pump is positioned below a light draft line of the hydrofoil vessel when at anchor.

5. The filter device further includes a filter casing that houses the filter element and has a maintenance opening formed therein, the filter device is disposed in a portion of the first sub-flow path upstream of the discharge pump, 5. A hydrofoil vessel as claimed in claim 1, wherein the maintenance opening is arranged to be higher than the light draft of the hydrofoil vessel when at anchor.

6. Further comprising a first sensor, The first sensor is capable of detecting a pressure or a flow rate of water supplied from the discharge pump to the first water use equipment, or a physical quantity correlated to the pressure or the flow rate, The hydrofoil vessel according to claim 1 , wherein the controller controls the discharge pump in response to a detection value of the first sensor.

7. Further comprising at least one second sensor; The first water utilization equipment includes at least one first heat exchanger capable of exchanging heat between the water in the first sub-flow path and a heat exchange target, The second sensor is capable of detecting a temperature of the heat exchange target or a physical quantity correlated with the temperature, The hydrofoil vessel according to claim 1 , wherein the controller controls the discharge pump in response to a detection value of the second sensor.

8. the at least one first heat exchanger includes a plurality of first heat exchangers; the at least one second sensor includes a plurality of second sensors; The hydrofoil vessel according to claim 7 , wherein the controller controls the discharge pump based on detection values ​​of the second sensors.

9. a circulation loop formed between the first heat exchanger and an outdoor unit of an air conditioner; A circulation pump provided in the circulation loop, The hydrofoil vessel according to claim 7 or 8, wherein the object of heat exchange is a fluid flowing through the circulation loop.

10. Further comprising a heater provided in the circulation loop, The hydrofoil vessel according to claim 9 , wherein the controller controls the heater in response to a detection value of the second sensor.

11. A vessel body, A strut protruding downward from the hull; A hydrofoil extending in the left-right direction from a lower portion of the strut; A main flow path passing through the inside of the strut and extending from a water intake located at a lower part of the strut to a water outlet located at the rear of the hull; a water jet pump having an impeller capable of pressurizing water introduced from the water intake into the main flow path toward the water jet outlet; At least one secondary flow path branching off from the primary flow path and extending to an outlet; At least one water-using device disposed in the at least one sub-flow path; The at least one sub-flow passage includes a first sub-flow passage branched off from a portion of the main flow passage upstream of the impeller, The at least one water-using device includes a first water-using device disposed in the first sub-flow path, A hydrofoil vessel, wherein the entire first sub-channel is positioned so as to be lower than the height of the minimum waterline of the hydrofoil vessel plus the dynamic pressure head of the intake when the hydrofoil is traveling.

12. The hydrofoil vessel according to claim 1 , wherein the at least one secondary passage includes a second secondary passage branching off from a portion of the main passage downstream of the impeller.

13. The water jet pump further includes a heat generating device that generates heat by operating in conjunction with the water jet pump. The at least one water-using device includes a second water-using device disposed in the second sub-flow path, The hydrofoil vessel according to claim 12, wherein the second water-using equipment is a second heat exchanger that cools a liquid that cools the heat-generating device.

14. The hydrofoil vessel according to claim 13, wherein the second water-using equipment is arranged so as to be lower than a height obtained by adding a discharge head of the water jet pump to a light draft line of the hydrofoil vessel during idling operation.

15. 15. A hydrofoil vessel according to claim 1, wherein the at least one water-utilising device is positioned so as to be higher than the load waterline of the hydrofoil vessel when at anchor.

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