JP2013052719A - Thrust enhancement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust enhancement device for enhancing thrust of a fountain propulsion device.SOLUTION: The thrust enhancement device 1 includes a gas discharge port 40 and a gas introduction device 50. One or more gas discharge ports 40 are disposed in a region where an axial high-speed water current flows in the fountain propulsion device 30. The gas introduction device 50 includes at least one gas introduction tube 51. An air intake 52 at an upper end of the gas introduction tube 51 is disposed at a predetermined position of a hull, and a lower step portion of the gas introduction tube 51 leads to the gas discharge port 40. The pressure near the gas discharge port 40 promptly decreases by Bernoulli's theorem to be the negative pressure when the high-speed water current in the fountain propulsion device 30 flows through the gas discharge port 40. The gas is sucked from an air intake 52.

Description

  The present invention relates to a thrust enhancer, and more particularly to a thrust enhancer that enhances the thrust of a fountain propulsion device by introducing gas.

  As a method of increasing the thrust of the conventional fountain propulsion device, there is a method of increasing the work rate of the screw or adjusting the shape of the screw, the angle between the screw and the horizontal line, or the transmission system as necessary.

  FIG. 1 is a schematic diagram showing the structure of a conventional fountain propulsion device 10 for a hull 20. The fountain propulsion device 10 includes an engine 11, a water conduit 12, a screw 13, a nozzle 14, and a guide nozzle 15.

  FIG. 2 is a schematic diagram showing a state in which the water flow of the fountain propulsion device 10 flows through the nozzle 14. Since the pure water flow discharged from the nozzle 14 cannot supply a stronger reaction force to increase the thrust, there is room for improvement.

In order to improve the above-mentioned problems, it is not possible to easily make a complicated configuration or change the configuration of the screw, and the cost is considerably high. Therefore, how to reduce the cost, improve the propulsion efficiency of the fountain propulsion device by increasing the thrust of the screw, and reduce the fuel consumption will be solved by the fountain propulsion device manufacturer or academic research organization. It has become an issue.
The main object of the present invention is to provide a thrust booster that enhances the thrust of the fountain propulsion device.

In order to achieve the above-described object, a thrust booster that enhances the thrust of a fountain propulsion device according to the present invention includes a gas discharge port and a gas introduction device.
The fountain propulsion device is mounted at a predetermined position on the hull. The fountain propulsion device includes an engine that drives a screw, a water conduit that stores the screw, and a nozzle that is disposed in an opening of the water conduit. The screw acts in water to generate an axial high-speed water flow in the water conduit. The nozzle has an outlet pipe with a gradually decreasing inner diameter.

One or more gas discharge ports are arranged in an area in the fountain propulsion apparatus where an axial high-speed water flow flows.
The gas introduction device has at least one gas introduction pipe. The intake port at the upper end of the gas introduction pipe is located at a predetermined position of the hull, and the lower part of the gas introduction pipe communicates with the gas discharge port.

When the high-speed water flow in the fountain propulsion device flows through the gas discharge port, the pressure in the vicinity of the gas discharge port rapidly decreases and becomes negative pressure by Bernoulli's theorem, so that gas is sucked from the intake port.
The gas sucked by the negative pressure flows through the gas discharge port via the gas introduction pipe, is discharged from the gas discharge port, and after mixing with water, a large number of bubbles are generated.

  Due to the gas compression function of the outlet pipe, the inner diameter of the nozzle gradually decreases, when the bubbles are compressed in a small volume and released from the nozzle, the bubbles are instantly expanded by the pressure difference between the inside and outside, increasing the reaction force and the thrust of the fountain propulsion device To improve.

Further, the gas discharge port is formed on the wall surface of the water conduit so as to communicate with the gas introduction pipe.
The gas discharge port is formed on the wall surface of the nozzle in order to communicate with the gas introduction pipe.
The nozzle has a guiding nozzle at the end. The gas discharge port is formed on the wall surface of the induction nozzle in order to communicate with the gas introduction pipe.

  The screw has an axial hollow tube. The hollow tube body has an inner end connected to the gas introduction tube, and a gas discharge port formed at the outer end to connect to the surface of the screw.

  The gas introduction device uses a method for assisting gas introduction. The system for assisting gas introduction is a system in which low-pressure gas such as exhaust gas, engine exhaust gas or steam turbine exhaust gas is introduced into the gas introduction pipe.

  The gas introducing device has a pressurizing device. The pressurizing device is constituted by any one of a pneumatic device, a blower, an engine, a steam turbine, and a turbine intensifier of a hull, and introduces gas into the gas introduction pipe by a pressurization method.

  In order to effectively apply Bernoulli's theorem, gas compressibility, and the gas compression function of a blow-out pipe whose inner diameter on the nozzle is gradually reduced, the gas introduction device and the suction force of negative pressure By introducing bubbles, not only can thrust be improved, but also the energy saving effect can be improved.

  The thrust booster according to the present invention introduces gas by using a negative pressure according to Bernoulli's theorem, in which a gas discharge port is arranged in the area where the axial high-speed water flow flows in the fountain propulsion device without changing the original configuration. By doing so, there is an effect of thrust increase.

It is a schematic diagram which shows the conventional fountain propulsion apparatus. It is a schematic diagram which shows the pure water flow of the conventional fountain propulsion apparatus. It is a schematic diagram which shows the state which produces | generates the gas bubble of the thrust increase apparatus by one Embodiment of this invention. It is a mimetic diagram showing the gas introducing device of the thrust booster by one embodiment of the present invention. FIG. 5 is a sectional view taken along line 5-5 in FIG. It is a schematic diagram which shows the state which generates a gas bubble in the negative pressure area of the thrust increase apparatus by one Embodiment of this invention.

  Hereinafter, a thrust booster according to the present invention will be described with reference to the drawings. Of these, not only are the types of ships different, but their shapes and configurations are different, so this embodiment will give a relatively good example, proceed with the explanation, and omit duplicate explanations for the same technical means employed. To do.

(One embodiment)
3 to 5 show an embodiment of the present invention. FIG. 3 is a schematic view showing a state in which the water flow in the present embodiment flows through the nozzle, and is used for comparison with the pure water flow 141 of the nozzle of the conventional fountain propulsion apparatus shown in FIG. 4 and 5 are schematic views showing an embodiment of the present invention. As shown in FIGS. 4 and 5, the thrust booster 1 includes a gas discharge port 40 and a gas introduction device 50.

  The hull 20 has a fountain propulsion device 30 mounted at a predetermined position. The type or shape of the hull 20 is not limited. The fountain propulsion device 30 includes an engine 31 that drives a screw 32, a water conduit 33 that stores the screw 32, and a nozzle 34 that is disposed in an opening of the water conduit 33. As the screw 32 acts in water, an axial high-speed water flow F is generated in the water conduit 33. As shown in FIGS. 5 and 6, the nozzle 34 has an outlet pipe 341 whose inner diameter is gradually reduced. In a relatively good embodiment, the nozzle 34 has a guide nozzle 35 disposed at the outlet 342. The above is the description of the basic structure of the fountain propulsion device 30.

  One or more gas discharge ports 40 are provided in the area where the axial high-speed water flow F flows in the fountain propulsion device 30. For example, at least one gas discharge port 40 is provided at any one of the water conduit 33, the nozzle 34, and the induction nozzle 35. The screw 32 has an axial hollow tube body 321. The hollow tube body 321 has a gas discharge port 40 formed such that the inner end 322 is connected to the gas introduction pipe 51 and the outer end is connected to the surface of the screw 32. As shown in FIGS. 5 and 6, the four parts described above have the gas discharge port 40 on the wall surface, but the present invention is not limited to this. That is, the gas discharge port 40 may be formed in any one part. In the most preferred embodiment, the gas outlet 40 is located close to the outlet 342 in the nozzle 34, that is, at a relatively fast position of the water flow in the nozzle 34. In the present embodiment, the gas discharge port 40 has a circular hole shape, but is not limited thereto, and may have another shape. In the present embodiment, it is relatively preferable that the gas discharge port 40 has a backward inclined shape, but the present invention is not limited thereto. Further, it has been found from experimental results that the gas discharge port 40 can be arranged vertically on the pipe wall surface, that is, a negative suction force can be generated at the gas discharge port 40 by a high-speed water flow.

  The gas introduction device 50 has at least one gas introduction pipe 51. As shown in FIG. 4, the intake port 52 at the upper end of the gas introduction pipe 51 is positioned at a predetermined location of the hull 20, for example, in the hull 20 or at a location higher than the water line WL. The lower part of the gas introduction pipe 51 communicates with the gas discharge port 40 on the wall surface of the water conduit 33 or / and the nozzle 34 or / and the induction nozzle 35 or is connected to the hollow tube body 321 in the axial direction of the screw 32. May be. This part may be arranged according to the shape of the ship and as required.

  When a high-speed water flow in the fountain propulsion device flows through the gas discharge port 40, the pressure in the vicinity of the gas discharge port 40 is rapidly reduced to a negative pressure by Bernoulli's theorem, so that gas is sucked from the intake port 52. . Since the high-speed water flow F in the axial direction generated when the screw 32 rotates has a very high speed, a very large negative pressure suction force can be generated at the gas discharge port 40. Such a gas introduction method has a very energy saving effect because the gas can be introduced only by rotation of the screw 13 without having to rely on power.

  The gas sucked by the negative pressure flows through the gas discharge port 40 via the gas introduction pipe 51, is discharged from the gas discharge port 40, and after mixing with water, a large amount of bubbles 60 are generated.

  Based on the compressibility of the gas, the gas compression function of the blow-out pipe 341 whose inner diameter on the nozzle 34 is gradually reduced reduces the volume of the bubble 60 and discharges the bubble 60 having a reduced volume from the nozzle 34. The bubble 60 is instantaneously expanded by the pressure difference between the two, and the thrust of the fountain propulsion device 30 is increased.

  More specifically, when the axial high-speed water flow F generated from the screw 32 flows through the outlet pipe 341 having a gradually reduced inner diameter on the nozzle 34, the flow rate of water increases and the pressure of the nozzle 34 increases. The gas bubbles sucked from the outlet 40 are compressed by the pressure and the volume is reduced. When the compressed gas bubbles flow through the outlet 342 together with the water flow, the surrounding water pressure is reduced, whereas the volume of the compressed bubble 60 is instantaneously expanded as shown in FIG. By increasing the reaction force, the thrust of the fountain propulsion device 30 can be increased. That is, in order to improve the above-described effects, the technical means presented by the present embodiment effectively adopts the following method.

1. By using Bernoulli's theorem, a high-speed fluid is used to generate a negative pressure around it.
2. According to the compressibility of gas and Boyle's law, the volume of compressible gas is inversely proportional to the pressure. Expressed by the equation, P ₁ V ₁ = P ₂ V ₂ . Increasing the pressure decreases the volume, and decreasing the pressure increases the volume. For example, 2P ₁ 1V ₁ = 1P ₂ 2V ₂ is shown by the equation.
3. Based on the characteristics of the gas compressor, if the incompressible water contains bubbles, it will change into a compressible form, and the blower pipe 341 whose inner diameter on the nozzle 34 gradually decreases will compress the bubbles 60 flowing through it. Fulfills the function.

  The thrust booster 1 of this embodiment, when introducing gas bubbles by the above-described technical means, it is only necessary to form the gas discharge port 40 in the high-speed water flow area in the fountain propulsion device 30 without having to rely on power. Cost reduction can be achieved reliably. Moreover, when it is necessary to introduce gas by applying pressure, several times the power effect can be obtained with a small amount of power.

  As shown in FIG. 4, the gas introduction device 50 can use a method for further assisting gas introduction. The system for assisting gas introduction is a system in which low-pressure gas such as exhaust gas, engine exhaust gas or steam turbine exhaust gas is introduced into the gas introduction pipe 51, which not only recycles resources but also resources. And without increasing the cost. Moreover, this embodiment can utilize the existing resource in the hull 20 when it is necessary to introduce gas by applying pressure. For example, first, the pressurization device 70 and the control valve 71 are arranged in the gas introduction pipe 51 of the gas introduction device 50. The pressurizing device 70 may be configured by any one of existing pneumatic equipment, a blower, an engine, a steam turbine, or a turbine intensifier in the hull 20. Subsequently, when a high pressure gas is introduced into the gas introduction pipe 51 by a pressurization method and the high pressure gas is discharged from the gas discharge port 40, higher propulsive power can be obtained. That is, several times the power effect can be obtained with a small amount of power.

  In order to effectively apply Bernoulli's theorem, gas compressibility, and the function of a gas compressor composed of a discharge pipe whose inner diameter on the nozzle is gradually reduced, Not only can thrust be increased by introducing gas bubbles with the suction force of the apparatus and negative pressure, but also the energy saving effect can be enhanced.

1 ... Thrust enhancing device,
20 ... hull,
30: Fountain propulsion device,
31 ・ ・ ・ Engine,
32 ... screw,
33 ... water conduit,
34 ・ ・ ・ Nozzle,
35 ... induction nozzle,
40: Gas outlet,
50 ... Gas introduction device,
51... Gas introduction pipe,
52 ・ ・ ・ Inlet,
60 ・ ・ ・ Bubbles,
70 ・ ・ ・ Pressurizing device,
71 ・ ・ ・ Control valve,
F: Axial water flow 141: Pure water flow,
321 ... Axial hollow tube,
322 ... inner end,
341 ... Blowout pipe whose inner diameter gradually decreases,
342 ... Air outlet,

Claims (8)

An engine that is mounted at a predetermined position of the hull and drives the screw; a water conduit that stores the screw; and a nozzle that is disposed at an opening of the water conduit; A thrust increasing device for generating a high-speed water flow in an axial direction in a water conduit, and the nozzle is configured to increase the thrust of a fountain propulsion device having a blow-out pipe having a gradually reduced inner diameter;
At least one gas discharge port disposed in an area in which the axial high-speed water flow flows in the fountain propulsion device;
A gas introduction device having at least one gas introduction pipe, wherein an inlet port at an upper end of the gas introduction pipe is positioned at a predetermined position of the hull, and a lower stage portion of the gas introduction pipe communicates with the gas discharge port; Prepared,
When a high-speed water flow in the fountain propulsion device flows through the gas discharge port, the pressure in the vicinity of the gas discharge port is rapidly reduced to a negative pressure by Bernoulli's theorem, so that gas is sucked from the intake port,
The gas sucked by the negative pressure flows through the gas discharge port via the gas introduction pipe, is discharged from the gas discharge port, and after mixing with water, a large amount of bubbles are generated,
Due to the gas compression function of the outlet pipe in which the inner diameter of the nozzle is gradually reduced, the bubbles are compressed in a small volume and, when discharged from the nozzle, are instantly expanded by the pressure difference between the inside and outside, increasing the reaction force, A thrust enhancer characterized by increasing the thrust of the fountain propulsion device.   The thrust enhancement device according to claim 1, wherein the gas discharge port is formed on a wall surface of the water conduit.   The thrust enhancement device according to claim 1, wherein the gas discharge port is formed on a wall surface of the nozzle. The nozzle has an induction nozzle at its end;
The thrust enhancement device according to claim 1, wherein the gas discharge port is formed on a wall surface of the guide nozzle. The screw has an axial hollow tube;
2. The gas discharge port according to claim 1, wherein the hollow tube body has an inner end connected to the gas introduction pipe and an outer end formed with the gas discharge port so as to connect to the surface of the screw. Thrust booster.   The thrust enhancement device according to claim 1, wherein the intake port at the upper end of the gas introduction pipe is located in a ship body or at a position higher than a water line.   7. The gas introduction apparatus uses a method for assisting gas introduction in which low-pressure gas such as exhaust gas, engine exhaust gas, or steam turbine exhaust gas is introduced into a gas introduction pipe. The described thrust booster.   The gas introduction device further includes a pressurization device including any one of a pneumatic device of a hull, a blower, an engine, a steam turbine, or a turbine intensifier. The thrust booster according to claim 7, wherein high-pressure gas is introduced.

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