JPH0740391U - Vessel with bubble generator - Google Patents

Abstract

(57) [Summary] [Objective] To provide an energy-saving and economical bubble generator-equipped hull that covers the hull in flight with fine bubbles to reduce the resistance during navigation. [Structure] Seawater introduction pipe 08 that opens to the seawater immersion surface of the bow
The external seawater is introduced by a pump via the, and the downstream of the seawater introduction pipe containing innumerable bubbles generated by the bubble generator 030 inserted in the middle part is branched into a plurality of branch pipes, and the small diameter downstream opening end 010 is In a ship with a bubble generator, which is formed by opening the outer plate of the seawater immersion surface of the bow portion at an appropriate vertical interval, a plurality of small holes of the same diameter are used as the bubble generator.
2 is a variable speed motor 017 having a central shaft 015 coaxially projecting at a rear end of a flat cylindrical container 011 having a relatively large diameter, the front end of which is closed by a cover plate 013 vertically and horizontally provided.
Submersible rotating body that rotates by an external air tank 020
And an air supply means for supplying compressed air to the cylindrical container 011 through the center hole of the rotary shaft 015 of the rotating body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a ship with a bubble generating device.

[0002]

[Prior art]

 As shown in the side view of Fig. 9 (A), the structure of a ship is known that reduces the resistance of the hull to water during navigation by covering the submerged surface of the hull with minute bubbles. ing. However, in the conventional structure of this type, only a fine mesh is installed at the air outlet on the surface of the hull.

[0003]

[Problems to be solved by the device]

 That is, in the sectional view taken along the arrow (B) in the figure, 01 is a hull, 02 is a water surface, 03 is an air supply source such as a compressor, 04 is an air guide pipe, 05 is an air discharge hole, 06 is a fine mesh mesh, and 07 is It is the generated bubbles. The diameter of the bubbles generated in such a structure is quite different from the size of the mesh and becomes large. For this reason, the air bubbles have a large buoyancy and immediately float up, so that the surface of the hull cannot be covered, and the expected reduction effect of hull resistance has not been obtained. According to the research by the present inventor, in order to obtain fine bubbles, it is important to reduce the size of the mesh and the flow velocity of water flowing therethrough. Therefore, by attaching a mesh to the rotating disk to generate a high relative flow velocity and enabling the generation of fine bubbles, seawater containing fine bubbles was previously created onboard the vessel and discharged to the surface of the hull. Then, we considered covering the hull with minute bubbles to reduce the resistance.

The present invention has been proposed in view of such circumstances, and provides an energy-saving and economical bubble generator-equipped hull that covers the hull with fine bubbles to reduce the resistance during navigation. The purpose is to do.

[0005]

[Means for Solving the Problems]

 Therefore, the invention of claim 1 introduces external seawater through the seawater introduction pipe from the large-diameter seawater introduction port opened in front of the seawater immersion surface of the bow, through the seawater introduction pipe, and at the middle portion of the seawater introduction pipe. The downstream of the seawater inlet pipe containing innumerable bubbles generated by the bubble generator inserted into the vessel is branched into a plurality of branch pipes, and the small-diameter downstream open end of each of the above branch pipes is placed outside the seawater immersion surface of the bow. In a ship with a bubble generator that is opened in the plate at appropriate intervals in the vertical direction, as a bubble generator, a small number of small holes with the same diameter were drilled vertically and horizontally, and the front open end was closed. A relatively large-diameter flat cylindrical container is rotated at its rear end by a variable speed motor around a central shaft that is coaxially projected, and compressed air is supplied from an external air tank to the rotary shaft of the rotary member. Supply to the above cylindrical container through the center hole of Bubble generating device with vessels, characterized in that it comprises the A supply means.

Further, the invention of claim 2 is characterized in that, in claim 1, a seawater introducing pump is inserted into the seawater introducing pipe.

[0007]

[Action]

 According to such a configuration, seawater containing fine bubbles is prepared in advance on the ship and is discharged to the surface of the hull. As a device for producing seawater with fine bubbles inside the ship, it is equipped with a rotating disk type microbubble generator, which takes in seawater from the outside of the vessel and passes it through the bubble generator to contain the fine bubbles, and then the surface of the hull again. To release. As the bubble generating device, “Japanese Patent Application No. 2-304486” filed previously by the applicant company is suitable.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an overall side view showing the first embodiment, Fig. 2 is a vertical sectional view showing a bubble generating device 030 of Fig. 1, and Fig. 3 is a part III of Fig. 2. FIG. 4 is an enlarged view, FIG. 4 is a longitudinal sectional view showing a modification of the bubble generating device of FIG. 2, FIG. 5 is an overall side view showing the second embodiment, and FIGS. 6 and 7 are 〓 and VII of FIG. 5, respectively. A horizontal sectional view taken along the arrow, and FIG. 8 is a side view showing the modification of FIG.

First, in FIGS. 1 and 2, the same reference numerals as those in FIG. 9 denote the same members, devices, etc. as shown in FIG. 9, where 07 is a group of fine bubbles, 08 is a seawater inlet pipe, 09 is a seawater discharge pipe, Reference numeral 010 is a seawater discharge port, and reference numeral 030 is a bubble diameter adjusting type underwater bubble generator according to Japanese Patent Application No. 2-304486 filed previously by the applicant company. Seawater is taken into the ship from the seawater introduction pipe 08. , Flows into the bubble generating device 030 shown in FIGS.

To explain the structure of the bubble generating device 030, first, in the longitudinal sectional view of FIG. 2 and the partially enlarged view of FIG. 3, 011 is a horizontal type relatively large-diameter and flat cylindrical container placed in water. The front end opening is closed by a bubble discharge plate 013 having innumerable bubble discharge holes 012 vertically and horizontally formed, and the rear end is closed by a rear end close plate 014. A rotary shaft 015 has a front end projecting from the center of the rear end closing plate 014 of the cylindrical container 011 and a large gear 016 fitted on the rear end, and is rotatably supported by a bearing (not shown). Reference numeral 017 denotes a variable speed motor directly connected to a small gear 018 meshing with the large gear 016, and 019 has a rear end connected to the air tank 020, an intermediate portion penetrating the center hole of the rotary shaft 015, and a front end portion rearward. A ventilation channel that penetrates the end blocking plate 014 and communicates with the cylindrical container 011; 021 is a bubble that is discharged from the bubble discharge plate 013 and floats; 021a is a relative flow velocity.

In such a device, by supplying pressurized air from the air tank 020 to the cylindrical container 011 through the ventilation channel 019 or the like, it is possible to discharge innumerable air bubbles 021 from the air bubble emitting plate 013. The cylindrical container 011 is rotated via the speed change motor 017 and the like. Then, as shown in FIG. 3, a relative flow velocity 021a is generated, which acts as a shearing force on the bubble 021 that has passed through the bubble discharge hole 012 and regulates the size of the bubble 021. The size of the bubble 021 can be adjusted to an arbitrary size by controlling the motor 017 with a motor 017.

As shown in FIG. 4, the front and rear ends of the cylindrical container are closed by front end closing plates 023 and rear end closing plates 027, respectively, and innumerable foam discharge holes 025 are vertically and horizontally formed in the side wall plate 024. You can also use it. Even in such a modified example of the cylindrical container, substantially the same action and effect as the structure of FIG. 2 can be obtained, and the distance of the bubble discharge hole 025 from which the bubble 021 is discharged from the rotation shaft 015 is constant. Therefore, the shearing force acting on each bubble 021 becomes constant, and therefore the diameter of the bubble 021 is uniform, and the test accuracy is improved.

Next, the second embodiment shown in FIG. 5 is different in that a water pump 031 is inserted into the seawater introduction pipe 08 of the first embodiment, but in other respects, it is different from that of FIG. It is substantially the same as the structure. This is because when the ship speed is high, the total pressure of P + P ₀ + (ρ / 2) · v ² is applied to the front end opening of the seawater inlet pipe 08, as shown in FIG. As shown in FIG. 7, since the total pressure of P _s + P ₀ + C _p · (ρ / 2) · v ² is applied to the ship-side opening, ΔP = (1-C _p ) (ρ / 2) · v ² forms a seawater flow path that flows in from the seawater introduction pipe 08, flows through the bubble generation device 030, and flows out from the seawater discharge pipe 09.

However, in the first embodiment, when the boat speed is low, the differential pressure ΔP becomes very small, and therefore it is not possible to utilize the establishment of this seawater flow path generated based on the boat speed. Therefore, in the second embodiment, this point is improved by inserting the water pump 031 into the seawater introduction pipe 08. Here, as shown in FIG. 8, if the seawater introduction pipe 08 is provided inside the spherical bow, the water pump effectively sucks in the seawater with little dust, and discharges it through the bubble generator 030. Discharge from the outlet 010. Note that the seawater discharge port 010 cannot cover the entire hull with only the seawater discharge port provided near the bottom of the ship because the rising speed of the seawater discharge port 010 becomes very small when the bubbles are small. Therefore, it is important to arrange multiple seawater discharge ports in the vertical direction and / or the front-back direction.

According to the apparatus of these Examples and Modifications, an arbitrary shearing force is applied to the bubbles discharged from the bubble discharge plate of the cylindrical container by changing the rotation speed of the cylindrical container by the variable speed motor. Since it is possible to adjust the size of the bubbles, it is possible to always generate an optimum bubble group. In this way, the fine bubbles are mixed in the seawater taken in from the seawater introduction pipe 08, and are discharged from the seawater discharge port 010 to the surface of the hull through the seawater discharge pipe 09. As a result, the submerged surface of the hull during navigation is covered with fine bubbles, and the resistance that the hull receives from water is reduced.

[0016]

[Effect of device]

 According to such a device, seawater containing fine bubbles of a desired size is discharged to the surface of the hull in advance, so the bubbles do not rise due to buoyancy and the seawater-immersed surface of the hull can be covered with the bubbles. it can. This makes it possible to reduce the resistance.

In short, according to the first aspect of the invention, external seawater is introduced through the seawater introduction pipe from the large-diameter seawater introduction port that is opened in front of the seawater immersion surface of the bow, and the seawater introduction pipe is introduced. The downstream of the seawater introduction pipe containing innumerable bubbles generated by the bubble generator inserted in the middle of the inlet pipe is branched into multiple branch pipes, and the small-diameter downstream open end of each branch pipe is immersed in seawater at the bow. In a ship with a bubble generator that opens on both sides of the surface of the ship at appropriate intervals in the vertical direction, the bubble generator uses a lid plate with a plurality of small holes of the same diameter vertically and horizontally. A relatively large-diameter flat cylindrical container with its open end closed, and a submerged rotating body that is rotated by a variable-speed motor on a central shaft that is coaxially projecting at its rear end, and compressed air from an external air tank. Through the center hole of the rotating shaft of the rotating body A hull with an energy-saving, economical bubble generator that aims to cover the hull with minute bubbles by utilizing the ship's speed to reduce the resistance when navigating by using the air supply means for supplying the container. Therefore, the present invention is extremely useful industrially.

Further, according to the invention of claim 2, in claim 1, the seawater introduction pump is inserted into the seawater introduction pipe, so that the hull is covered with fine bubbles even at low speed navigation, and the navigation is performed. The present invention is extremely useful industrially, since an energy-saving and economical hull with a bubble generator for reducing the resistance to time is obtained.

[Brief description of drawings]

FIG. 1 is an overall side view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a bubble generating device 030 of FIG.

FIG. 3 is an enlarged view showing a part III in FIG.

FIG. 4 is a vertical sectional view showing a modified example of the bubble generating device of FIG.

FIG. 5 is an overall side view showing a second embodiment of the present invention.

6 is a horizontal cross-sectional view taken along the arrow 〓-〓 of FIG.

FIG. 7 is a horizontal sectional view taken along the line VII-VII in FIG.

FIG. 8 is a side view of the modification of FIG.

FIG. 9 shows a conventional ship with a bubble generating device, FIG. 9 (A) is an overall side view thereof, and FIG. 9 (B) is a sectional view taken along the line BB of FIG.

[Explanation of symbols]

 01 Hull 02 Water surface 03 Air supply source 04 Air guide pipe 05 Air discharge hole 06 Fine mesh 07 Generated bubble 08 Seawater introduction pipe 09 Seawater discharge pipe 010 Seawater discharge port 011 Cylindrical container 012 Bubble discharge hole 013 Bubble discharge plate 014 Rear end blockage Plate 015 Rotating shaft 016 Large gear 017 Variable speed motor 018 Small gear 019 Ventilation flow path 020 Air tank 021 Air bubble 021a Relative flow velocity 023 Front end blocking plate 024 Side wall plate 025 Bubble discharge hole 027 Rear end blocking plate 030 Bubble generator 031 Water pump

Claims (2)

[Scope of utility model registration request] 1. External seawater is introduced through a seawater introduction pipe from a large-diameter seawater introduction port opened in front of the seawater immersion surface of the bow, and is inserted into the middle portion of the seawater introduction pipe. The seawater introduction pipe containing innumerable bubbles generated by the bubble generator is branched downstream into a plurality of branch pipes, and the small-diameter downstream open ends of the branch pipes are vertically arranged on both sides of the seawater immersion surface of the bow. In a vessel with a bubble generator that is opened at appropriate intervals, as the bubble generator, a relatively large diameter with a front opening end closed by a lid plate in which a plurality of small holes of the same diameter are vertically and horizontally provided. A flat cylindrical container is rotated by a variable speed motor with a central shaft coaxially projecting from its rear end and a submersible rotating body, and compressed air from an external air tank is passed through the center hole of the rotating shaft of the rotating body. An air supply means for supplying the cylindrical container A ship with an air bubble generator characterized in that 2. A ship with a bubble generator according to claim 1, wherein a seawater introduction pump is inserted into the seawater introduction pipe.