JPH0685190U - The hull resistance is reduced by the jet of gas, and the propulsion unit is placed in a duct. - Google Patents

Abstract

(57) [Abstract] [Objective] The present invention is an economically efficient engine that has already been developed and has a proven track record, and the hull inundation surface is covered with gas to reduce resistance, and gas is mixed into the propulsion device. In order to prevent this, a propulsion device is provided in a duct inside the hull, and it is a device that seeks high speed and economy by combining these. [Structure] The outside of the hull is straight, and the gas is jetted from multiple points so that it covers the entire inundation surface from the bow to the stern. A duct is provided from the opening of the bow to the center bottom of the hull or the bottoms of both strings, and a propulsion device is provided inside the duct. From the opening of the bow to the upper part of the entrance of the duct, the same part is equipped with a device for letting air sucked together with water to escape to the upper part and attenuating the force of the wave, and it is also possible to use the air compressed by the wave.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is intended to obtain relatively high speed power by using a diesel engine which is already sufficiently developed and has a low fuel consumption rate and is unlikely to allow other engines to follow for the time being. In order to reduce the friction resistance due to the gas ejected along the outer surface of the hull and to prevent the thruster from being hindered by the gas, the central bottom part inside the hull, Alternatively, the bottoms of both sides are used as ducts, and the propulsion device is rotated in the ducts to obtain high-speed power and low fuel consumption rate.

[0002]

[Prior art]

 It is generally said that the fuel consumption of a ship is proportional to the cube of speed. Therefore, in the conventional hull form, if an attempt was made to increase speed, an increase in fuel consumption was unavoidable, so speed could not be remarkably increased except for special ships that do not consider fuel consumption. Moreover, even if a high speed force could be obtained with a special hull, a special engine and a special propulsion device were required.

[0003]

[Problems to be solved by the device]

 Currently, most large oceangoing vessels use low-speed two-cycle engines with excellent fuel consumption, high reliability, easy handling, and low fuel consumption. However, it is considered that this type of engine is hardly applicable to the next-generation high-speed vessels that have recently been considered because of their hull shape. The present invention intends to use this excellent low speed two-cycle engine and obtain relatively high speed power.

[0004]

[Means for solving the problem]

 (1) In order to use an existing low-speed two-cycle engine and a propulsion device to obtain high speed, a duct is installed from the duct inlet on the bow to the bottom of the center of the hull or the bottom of both chords to make a straight line outside the hull and jet from the outer plate Make sure that the entire surface of the water is covered with gas. (2) Since a propeller combined with an existing engine is used, propellant is propelled in the duct to prevent gas from being sucked into the propeller through the propeller shaft and passing through the duct to prevent cavitation. The vessel is rotated and seawater sucked from the bow is ejected to the stern to obtain thrust.

[0005]

[Action]

 The operation of the present invention will be described. (1) The duct at the center of the hull or at the bottom of both chords rectifies the flow of water flowing into the propeller to increase the propeller efficiency. (2) Of the ship resistance, the bow wave, which is the largest wave-making resistance at high speed, can be dissipated in the duct bow inlet. (3) It is possible to reduce the capacity of the compressor by introducing the air compressed in the wave-eliminating part of the bow to the suction side of the compressor. (4) Since the flooded surface of the hull except the duct is covered with gas, the frictional resistance of the hull is reduced. (5) In designing the ship, restrictions on the propulsion device due to the shape of the ship are reduced. (6) Since the outside of the hull is straight and changes little in shape and is covered with gas, wave resistance and friction resistance are reduced.

[0006]

【Example】

 Although there is no actual ship example, it has been theoretically verified that the efficiency of propeller in duct and laminar flow is increased. The difference in frictional resistance between liquid and solid and gas and solid is also theoretically recognized.

[0007]

[Effect of device]

 (1) Technologies that have already been recognized for their economic efficiency can be used for engines and thrusters. (2) Since there is no protrusion on the bottom of the ship as compared to the floating type ship, it is only necessary to consider a draft similar to that of an ordinary ship, so it is possible to enter a conventional port. (3) Theoretically, the width of the ship is independent of speed. (4) Compared to other high-speed vessels such as the floating type, the upper part of the waterline does not rise, so it is unlikely to be affected by the weather at sea. (5) A self-reversing type engine, whose performance has already been demonstrated, can be used, which is advantageous in terms of maneuvering without requiring a special mechanism for switching between forward and reverse. (6) Even when it is necessary to stop urgently, if the engine is stopped at the same time as the gas jetting device, the resistance suddenly increases due to the shape of the hull, and sufficient speed is required until the engine reverses and obtains reverse output. Can be reduced. (7) If a branch pipe is attached to the duct, the power required for cooling water can be saved. (8) Since the existing engine can be used regardless of the size of the ship, the type of the ship, or the purpose of use, it is economical because it is not necessary to develop an engine for obtaining high speed power. (9) Implementation of the device If the duct is installed at the center bottom, it is a monoaxial ship, or if it is installed on the bottoms of both strings, it is a biaxial ship, and if the ducts at the bottom of both strings are combined at the stern, two ducts are used. It can be used as a single shaft, and the duct and propulsion shaft can be arranged according to the ship's application and cargo. (10) For ships such as tankers that require double hulls, ducts can be passed through the parts that are not used for loading.

[Brief description of drawings]

[Fig. 1] Side view of a central duct

FIG. 2 is a plan view of a central duct

FIG. 3 is a front view of a central duct

FIG. 4 is a plan view of a double-sided duct with two axes.

FIG. 5 is an example of a single axis in a plan view of a port-side duct

FIG. 6 is a front view of a port-side duct

[Explanation of symbols]

1 is a hull 2 is an engine 3 is a jet of air 4 is a duct 5 is a propulsion device 6 is a layer of air jetted from a jet of air 3 Numeral 7 is an air vent pipe provided on the bow of the bow, which removes the air contained in the water sucked into the bow to weaken the wave energy,
Prevent air from getting into the water.

[Procedure amendment]

[Submission date] December 10, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

Claims (1)

[Scope of utility model registration request] A ship shape with a straight outer port, which combines a reduction in hull resistance due to the ejection of gas and a propulsion duct at the center of the hull or at the bottom of both sides.