JPH08243368A - Micro bubble ejection device - Google Patents

Abstract

(57) [Abstract] [Purpose] This is related to a micro-bubble jetting device, which enhances the attachability and applicability to the target range of friction reduction in a navigation vehicle, and makes effective the kinetic energy when jetting a bubbling water mixed fluid. To effectively reduce energy consumption during operation of the vehicle. A channel structure body that is supported on the outside of a hull and that transfers the bubbly water mixed fluid, a fluid ejection port that is connected to the channel structure body and that ejects the bubbly water mixed fluid, and the fluid ejection port And a fluid guide plate which is integrally arranged at the front edge portion of and guides the jet direction of the bubble-water mixed fluid backward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jetting device for microbubbles which is used when reducing the friction of a vehicle by utilizing a fluid mixture of bubbles and water.

[0002]

2. Description of the Related Art In order to reduce the friction of a ship or the like, a method has been proposed in which a bubble or an air layer is interposed on the surface of the hull. Techniques for ejecting bubbles into water include (1) JP-A-50-83992 and (2) JP-A-53-13628.
No. 9, (3) JP-A-60-139586, (4) JP-A-61-71290, (5) Jitsukai 61-39691.
No. 6, (6) Japanese Utility Model Publication No. 61-128185 is proposed.

In these techniques, as a method of ejecting bubbles, pressurized air generated by an air pump is ejected into water through a plurality of holes or perforated plates.

[0004]

However, with the method of ejecting only pressurized air from a plurality of holes, it is difficult to obtain fine bubbles, and the bubbles easily separate from the hull due to the lifting force based on buoyancy. In the technology that reduces the frictional resistance reduction range and blows out fine bubbles from the porous plate, the energy consumption based on the pressure loss when bubbles are blown out on the porous plate becomes large, and the energy saving by reducing the frictional resistance is more important than the energy saving. There is a drawback that the energy consumption for blowing out is increased and the practicality is impaired. In reality, none of the above-mentioned technologies (1) to (6) have been put to practical use. is there.

The present invention has been made in view of these circumstances, and has the following objects. To improve the mountability and applicability to the target range of friction reduction in a vehicle. Effectively pumping bubbly water mixed fluids along the surface of the spacecraft. To effectively use the kinetic energy when jetting a bubbling water mixed fluid to effectively reduce the energy consumption during operation of the vehicle. To facilitate the setting of the jetting angle of the bubbly water mixed fluid, which is effective in reducing friction, according to the jetting amount and the transfer speed of the bubbly water mixed fluid. Protect the jet of bubbly water mixed fluid.

[0006]

A microbubble jetting device according to the present invention is a device for jetting a bubbly water mixed fluid, and is a flow path forming member which is supported on the outside of a hull and transfers the bubbly water mixed fluid. And a fluid ejection port, which is arranged in a connected state to the flow path forming body and ejects the bubbly water mixed fluid, and is integrally arranged at a front edge portion of the fluid ejection port, and guides the ejection direction of the bubbly water mixed fluid backward. A technique including a fluid guide plate is adopted.
As the fluid guide plate, a technique is adopted in which a part of the outer wall of the flow path forming member is punched to be arranged at the front edge portion of the opened fluid ejection port. The channel structure is preferably supported by a support structure attached to the outside of the hull, and the material of the channel structure is preferably a stainless steel plate or the like. A shoulder with the opening widened is formed at the rear of the rear edge of the opening.
The shoulder has a vertical cross-section formed in an arc shape, and the relationship between the radius of curvature R of the shoulder and the width S of the flow path in the vertical cross section is R ≧ 50S.
Is set to A fluid guide plate is rotatably arranged at the front edge portion of the fluid ejection port, and an opening / closing drive mechanism such as an actuator for driving the fluid ejection port to open / close is provided on the fluid guide plate.
The angle of the fluid guide plate is set in order to adjust the ejection angle of the bubbly water mixed fluid in accordance with the ejection speed and ejection amount of the bubbly water mixed fluid.

[0007]

The bubbly water mixed fluid generated by the bubbly water mixed fluid generating means is transferred to various places along the hull by the flow passage structure. This bubbly water mixed fluid is jetted toward the rear of the hull from the fluid jet port by utilizing static pressure and its own kinetic energy. When the bubbly water mixed fluid is ejected from the fluid ejection port, the bubbles are present along the submerged surface of the submerged state, and the effect of reducing friction during cruising is produced, and the ejection of the bubbly water mixed fluid is also produced. Driving force is generated in the opposite direction to the forward direction of the hull. The jet direction of the bubbly water mixed fluid is changed to the rear by the fluid guide plate, and the kinetic energy at the time of jetting the bubbly water mixed fluid is effectively utilized. When the shoulder is formed at the trailing edge of the fluid ejection port, the bubbly water mixed fluid guided rearward by the fluid guide plate is guided from the trailing edge of the fluid ejection port to the submerged surface. That is, the jetting direction of the bubbly water mixed fluid due to the static pressure based on the opening cross section near the fluid guide plate and the jetting direction based on the kinetic energy of the bubbling water mixed fluid are substantially coincident with each other, and the jetting direction is set rearward or obliquely backward To be done. Further, the vertical cross-sectional shape of the shoulder portion is formed in an arc shape, and the relationship between the radius of curvature R and the width S of the flow path is R.
By setting ≧ 50S, the flow direction of the bubbly water mixed fluid in the shoulder portion gradually changes, and the loss of the kinetic energy of the bubbly water mixed fluid becomes smaller. The fluid guide plate is
It is opened and closed by the opening / closing drive mechanism, and when the bubbling water mixed fluid is jetted, the jetting angle of the bubbling water mixed fluid is set, and at the time of mooring, etc., the fluid jet port is closed by closing the fluid jet port. Protects the fluid composition.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a microbubble ejection device according to the present invention will be described below with reference to the drawings.

[First Embodiment] FIGS. 1 and 2 show a first embodiment of a micro-bubble jetting device according to the present invention. Reference A is a micro-bubble jetting device and Y is a friction-reducing cruise. Body, E is the friction reduction target range (blowing area), 1
Is a hull, 2 is a bubble-water mixed fluid generating means, 3 is a fluid ejection port, 4 is a submerged surface (ship surface), 5 is a propeller, 6 is a rudder,
Reference numeral 7 indicates an air intake port, and 8 indicates a water intake port.

At a suitable position of the hull 1 in the friction-reducing vehicle Y, a bubble-water mixed fluid generating means 2 to be described later is mounted, and the bubble-water mixed fluid generating means 2 has an air intake port 7 and a water intake port 8. It is connected to supply air and water at a desired ratio and has a function of generating a bubbling water mixed fluid before ejecting the fluid from the fluid ejection port 3 of the ejection device A.

The details of the micro-bubble ejection device A will be described below. As shown in FIG. 2, the ejection device A includes a supporting structure 11 such as a shape steel attached to the outside of the hull 10 of the hull 1, A flow path forming body 12 supported by the support structure 11, a fluid ejection port 3 arranged in the flow path forming body 12, and a fluid guide plate 13 arranged at a front edge portion of the fluid ejection port 3. It is equipped with.

The flow path structure 12 is attached to the support structure 11 by welding or the like, and includes a base plate 14 and
An outer wall supporting plate 15 integrally attached to the base plate 14 in an orthogonal state, an outer wall 16 forming a submerged surface 4 integrally arranged outside the outer wall supporting plate 15, and a space between the base plate 14 and the outer wall 16. Flow path 17 formed in
And have. The base plate 14, the outer wall support plate 15, and the outer wall 16 are made of stainless steel plate or the like.

The flow passage 17 is arranged along the front-rear direction of the hull 1 and is connected to the bubbly water mixed fluid generating means 2, and both sides of the flow passage 17 are sealed by outer wall support plates 15. .

The fluid outlet 3 and the fluid guide plate 13 will be supplementarily described. The fluid guide plate 13 is formed by punching the outer wall 16 to leave a tongue piece, and a portion opened at the time of punching. A fluid ejection port 3 is formed in the. The base of the fluid guide plate 13 is integrally supported on the front edge of the fluid ejection port 3, and the tip of the fluid guide plate 13 is directed obliquely rearward away from the submerged surface 4.

In the micro-bubble jetting device A thus constructed, when the bubble-water mixed fluid generating means 2 is actuated, as described above, the bubble-water mixed fluid in which air and water are mixed at a desired ratio. Then, the bubbly water mixed fluid is transferred to the fluid ejection port 3 at a desired position along the hull 10 by the flow passage 17 of the flow passage forming body 12. The bubbly water mixed fluid is jetted to the submerged surface 4 by static pressure and its own kinetic energy in the vicinity of the fluid jet port 3. At this time, since the opening surface is set by the trailing edge of the fluid ejection port 3 and the tip of the fluid guide plate 13, the ejection direction of the bubbly water mixed fluid due to the static pressure is almost parallel to the submerged surface 4, and Thus, the jetting direction of the bubbly water mixed fluid due to the kinetic energy is the guiding direction of the fluid guiding plate 13, that is, the obliquely rearward direction. Therefore, the directions of both vector sums are almost along the submerged surface 4, and many bubbles (micro bubbles) with a small diameter are present in the vicinity of the submerged surface 4 without expanding the jetting direction of the bubbly water mixed fluid. Can be present.

Further, the bubbling water mixed fluid is jetted out along the submerged surface 4 to act as a propulsive force in the opposite direction. This propulsive force is applied to the hull 1 via the support structure 11.
Is transmitted to the hull 10 and serves as a driving force to the front of the hull 1. In this case, since the mass difference between air and water is three orders of magnitude, the generation of the propulsive force due to the jetting of the bubbling water mixed fluid is mainly based on the kinetic energy of water.

[Second Embodiment] Next, a second embodiment of the ejection device A will be described with reference to FIG. In this figure, 20 is an opening, 21 is a shoulder, and 22 is a flow channel plenum. In the ejection device A according to the second embodiment, a part of the hull 10 (in the vicinity of the submerged surface 4) is used as the flow path forming body 12, and the flow path 17 in a penetrating state is formed obliquely rearward. At the same time, the flow path 17 is connected to the fluid ejection port 3 formed on the submerged surface 4. In addition, in a part of the flow path 17,
A flow passage plenum portion 22 having an enlarged flow passage cross section is formed near the fluid ejection port 3.

The fluid ejection port 3 has an opening 20 formed on the outer surface of the hull 10 and connected to the flow path 17, and the opening 20.
Fluid guide plate 13 attached to the front edge of the
Shoulder 2 formed with a rear opening at the rear edge
1 and. The angle of the shoulder 21 with respect to the downstream direction of the submerged surface 4 is set to be smaller along the submerged surface 4 as compared with the angle in the penetrating direction of the flow path 17.
Then, the fluid guide plate 13 is directed rearward so as to be flush with the submerged surface 4 with the front edge of the opening 20 as a base.

In the jetting device A having the above-described structure, the bubbling water mixed fluid is transferred along the flow path 17 and the flow area is increased at the flow path plenum portion 22 due to its large cross-sectional area. After being reduced, the liquid is ejected from the gap between the tip of the fluid guide plate 13 and the shoulder 21. The jetting direction of the bubbly water mixed fluid due to the static pressure at this time is determined by the shoulder 21
And the tip of the fluid guide plate 13 and the direction orthogonal to the opening surface, so that it is almost parallel to the submerged surface 4 and, in addition, ejection of the bubbly water mixed fluid based on the kinetic energy of the bubbly water mixed fluid. The direction is the guiding direction by the fluid guide plate 13 and the shoulder 21, that is, the obliquely rearward direction. Therefore, the directions of both vector sums are substantially along the submerged surface 4, as in the first embodiment.

If it is assumed that the jetting direction of the bubble-water mixed fluid is set only by the penetrating direction of the flow passage 17 without disposing the fluid guide plate 13 and the shoulder portion 21, the flow passage 1
7 must be formed at an acute angle to the submerged surface 4. However, the sharper the direction of the flow path 17 is, the more difficult it is to perforate the submerged surface 4, and there is a manufacturing limit. In this respect, in the above-described embodiment, the direction of the flow path 17 is within the processing allowable range, the workability is excellent, and the jetting direction of the bubbly water mixed fluid along the submerged surface 4 can be obtained.

[Third Embodiment] Next, a third embodiment of the jetting apparatus A will be described with reference to FIG. 4. The difference from the second embodiment is that the shoulder 21 of the opening 20 has a vertical sectional shape. Is a point formed in an arc shape. When this shoulder portion 21 is adopted, the jetting direction of the bubbly water mixed fluid along the submerged surface 4 can be obtained, and the shoulder portion 21 is formed in an arc shape as in the third embodiment, so that the bubble The flow direction of the water-mixed fluid gradually changes, and the loss of the kinetic energy of the bubbly water-mixed fluid is smaller than that in the second embodiment.

By setting the relationship between the radius of curvature R of the shoulder portion 21 and the width S of the flow path 17 in the longitudinal section to be R ≧ 50S, the loss of the kinetic energy of the bubble-water mixed fluid in the shoulder portion 21 is reduced. It can be further reduced.

[Fourth Embodiment] FIG. 5 shows a fourth embodiment of the ejection device A.
In the embodiment, reference numeral 23 is an opening / closing drive mechanism (actuator). In the fourth embodiment, the fluid ejection port 3
A fluid guide plate 13 is rotatably attached to a support shaft 13a at the front edge of the fluid guide plate 13.
An actuator 23 is connected to.

In the example of FIG. 5, the jet direction of the bubbly water mixed fluid due to static pressure is determined by the opening surface between the tip of the fluid guide plate 13 and the rear edge of the fluid jet port 3, and the submerged surface 4 is substantially parallel to 4 and, in addition, the jet direction of the bubbly water mixed fluid due to kinetic energy is the guiding direction of the fluid guide plate 13, that is, the obliquely rearward direction. Therefore, the directions of both vector sums are substantially along the submerged surface 4.
The guide direction of the fluid guide plate 13 is the actuator 23.
It can be freely adjusted by driving, and the ejection direction of the bubbly water mixed fluid can be changed at the same time. In addition, at the time of berthing or the like, the fluid guide plate 13 is rotationally driven to close the fluid ejection port 3 to prevent the invasion of marine animals and plants and protect the fluid ejection port 3 and the flow path structure 12. Is possible.

On the other hand, FIG. 6 shows a bubble-water mixed fluid generating means 2
This is an example of the structure of the water suction port 8 and the pressurized water supply means 2
4, and a large number of pores 25 that are formed in a part of the side wall (tube wall) of the flow path constituting body 12 in the longitudinal direction with a substantially uniform interval in the circumferential direction and the longitudinal direction. And a gas chamber 26 that surrounds the pores 25.
And a pressurized air supply means 27 connected to the internal space of the gas chamber 26.

When the bubbly water mixed fluid is generated by the bubbly water mixed fluid generating means 2, the pump of the pressurized water supply means 24 is operated to send seawater (water) into the flow path forming body 12, and Pressurized air supply means 27
By operating the blower, the pressurized air is sent into the internal space of the gas chamber 26 and ejected from the large number of pores 25 to generate a bubble-water mixed fluid in which bubbles are mixed. is there.

[0027]

The microbubble ejection device according to the present invention has the following effects. (1) By attaching the flow passage structure to the hull via the support structure, the attachability and applicability to the friction reduction target range of the hull can be enhanced. (2) Since the fluid guide plate is attached to the front edge of the opening at the fluid ejection port, the bubbling water mixed fluid is guided and the ejection direction is changed to the rear, so that the kinetic energy of the ejection of the bubbling water mixing fluid is changed. It is possible to effectively use the hull as a driving force for propelling the hull forward, and to effectively reduce energy consumption during operation of the vehicle. (3) By forming a shoulder with an opening widened rearward at the trailing edge of the fluid ejection port, the bubbly water mixed fluid is guided along the shoulder so that the ejection direction is substantially parallel to the submerged surface, The bubbly water mixed fluid can be effectively sent along the surface of the spacecraft. (4) By providing a rotatable fluid guide plate at the fluid ejection port and opening and closing it by the opening / closing drive mechanism, the angle of the fluid guide plate is adjusted to change the ejection direction of the bubbly water mixed fluid. It is possible to perform the ejection direction of the bubbly water mixed fluid, which is effective in reducing friction, in accordance with the ejection amount, the transfer speed, and the like. (5) At the time of mooring, etc., the fluid guide plate is driven to close the fluid ejection port, so that the fluid ejection port and the flow path can be protected.

[Brief description of drawings]

FIG. 1 is a partially omitted front view showing an example of a ship to which a microbubble ejection device according to the present invention is applied.

FIG. 2 is a first of a micro-bubble ejection device according to the present invention.
FIG. 3 is a front sectional view and a right sectional view with a part omitted showing an embodiment.

FIG. 3 is a second microbubble ejection device according to the present invention.
FIG. 4 is a front sectional view with a part omitted showing an embodiment.

FIG. 4 is a third embodiment of the microbubble ejection device according to the present invention.
FIG. 4 is a front sectional view with a part omitted showing an embodiment.

FIG. 5 is a fourth embodiment of a microbubble ejection device according to the present invention.
FIG. 4 is a front sectional view with a part omitted showing an embodiment.

FIG. 6 is a front sectional view together with a block diagram showing an example of a bubble-water mixed fluid generating means applied to a microbubble jetting device according to the present invention.

[Explanation of symbols]

 A jetting device (microbubble jetting device) E Friction reduction target range (blowing region) Y Friction-reducing vehicle 1 Hull 2 Bubble water mixed fluid generating means 3 Fluid jet 4 Submerged surface (hull surface) 7 Air intake 8 Water Suction Port 10 Hull 11 Support Structure 12 Flow Path Constituent 13 Fluid Guide Plate 14 Base Plate 15 Outer Wall Support Plate 16 Outer Wall 17 Flow Path 20 Opening 21 Shoulder 23 Actuator (Opening / Closing Drive Mechanism) 26 Gas Chamber R Shoulder Curvature Radius S Flow width

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoshiaki Takahashi, Yoshiaki Takahashi, 2-1-1 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries, Ltd. Tokyo No. 1 factory (72) Osamu Watanabe Shinchu, Isogo-ku, Yokohama-shi, Kanagawa Haramachi No. 1 Ishikawajima-Harima Heavy Industries Co., Ltd. Technical Research Institute (72) Inventor Hideo Mitsutake No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima Harima Heavy Industries Co., Ltd. Technical Research Institute (72) Inventor Shoichi Maruyama Yokohama, Kanagawa No. 1 Shin-Nakahara-cho, Isogo-ku, Ishi Ishikawajima Harima Heavy Industries Ltd. Technical Research Institute

Claims (4)

[Claims] 1. A device (A) for ejecting a bubbling water mixed fluid.
And a flow path component (12) supported outside the hull (10) for transferring the bubbly water mixed fluid, and a fluid jet arranged in a connected state to the flow path component to eject the bubbly water mixed fluid. Exit (3),
A device for ejecting micro-bubbles, comprising: a fluid guide plate (13) which is integrally arranged at the front edge of the fluid ejection port and guides the ejection direction of the bubble-water mixed fluid backward. 2. A fluid guide plate (13) is a flow path forming body (1).
2. The microbubble ejection device according to claim 1, wherein the outer wall (16) of (2) is disposed at the front edge of the fluid ejection port (3) which is opened by punching. 3. The microbubble ejection device according to claim 1, wherein a shoulder portion (21) is formed at the rear edge of the opening (20) with the opening widened rearward. 4. A fluid guide plate (13) is rotatably arranged at the front edge of the fluid jet port (3), and an opening / closing drive mechanism (23) for driving the fluid jet port to open and close is provided on the fluid guide plate. The microbubble ejection device according to claim 1 or 3, wherein.