JPH08230761A - Equipment for generating micro bubble - Google Patents

Abstract

PURPOSE: To improve the efficiency to generate the bubble-water mixed fluid by providing a whirling flow generating means to be inserted in a fluid transfer pipe provided with a number of pores, and feeding the compressed air from the pores and ejecting it to increase the moving speed of water in the vicinity of the pores to frequently cut the air flow. CONSTITUTION: When a pressurized water feeding system 1 is operated, the sucked sea water, etc., is pressurized to feed the water into a fluid transfer pipe 3, and the flowing water is generated in the fluid transfer pipe 3. The whirling force is given to this flowing fluid by whirling blades 4 to generate bubbles. The bubble-water mixed fluid is transferred to a bubble-water mixture ejecting part 6 to be ejected into the seawater. When a compressed air feeding system 2 is operated, the compressed air is fed into an air plenum part 5a of a gas chamber 5 through a compressed air feed pipe 2a, and ejected into the flowing water from a number of pores 3b. The air flow crosses the whirling flow to generate the phenomenon that the air flow is cut by the whirling flow. As a result, a number of bubbles of small diameter are generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microbubble generator used for reducing the friction of a vehicle.

[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. Increase the amount of bubbles in the mixed fluid. To increase the generation efficiency of bubbly water mixed fluid. To homogenize the bubble density in a mixed fluid. Improving the transferability of the bubbly water mixed fluid. To reduce the bubble diameter in the mixed fluid.

[0006]

In the device for generating microbubbles according to the present invention, a fluid transfer pipe connected to a pressurized water supply means and having a large number of pores formed in its side wall, and an inserted state inside the fluid transfer pipe. A swirl flow generating means for providing a swirl flow to the flowing water, a gas chamber arranged around the fluid transfer pipe and in communication with the pores, and a pressurized gas fed into the gas chamber to send pressurized gas. A technique provided with a pressurized gas supply means for ejecting from the pores is adopted. In addition, as a device for generating microbubbles, a fluid transfer pipe connected to a pressurized water supply means and through which pressurized water is inserted, and a large number of pores that are arranged inside the fluid transfer pipe and are in communication with the hollow portion are formed in the surface. A technique including a hollow propeller that is rotated by the intersection with running water and a pressurized gas supply unit that is connected to the hollow portion of the hollow propeller and sends a pressurized gas is also adopted. When arranging the hollow propeller inside the fluid transfer pipe, the outside of the fluid transfer pipe and the hollow propeller are connected to each other to transmit a rotational force, and a hollow propeller connected to the rotational force transmission system is installed. It is preferable to add a technique including a rotation drive source for forced rotation. In the case of a hollow propeller, the propeller shaft is formed in a hollow state, and a connection housing that allows rotation of the propeller shaft around a connection hole in a connected state with respect to the hollow portion of the propeller shaft is arranged, and is connected to the connection housing. A technique is added to which the pressurized gas supply means is connected. A flexible wire is effective as a rotational force transmission system that connects the outside of the fluid transfer pipe and the hollow propeller. A swivel joint is suitable as a means for supporting the propeller shaft of the hollow propeller.

[0007]

The pressurized water from the pressurized water supply means is sent out to the fluid transfer pipe, and the swirl flow generating means such as swirl vanes is interposed in the middle of the fluid transfer pipe so that swirl force is applied to the running water to form a swirl flow. . On the other hand, the pressurized air from the pressurized gas supply means is sent into the gas chamber and ejected from a large number of pores into flowing water flowing through the fluid transfer pipe. The airflow ejected from the pores into the running water is not only thinned and easily divided, but also is sequentially transferred to the downstream by the running water, and the running water is swirling. The flow rate is constant and the relative velocity between the pores and running water increases, so the air flow is easily broken and subdivided at the time of intersection with the running water, forming bubbles with small diameters and mixing with the running water. After that, the fluid is transferred to a bubbling water jetting portion at a desired position by the fluid transfer pipe and is used for reducing the friction of the running body. The amount and bubble ratio of the bubbles of the bubble-water mixed fluid are set according to the diameter and number of pores, the amount of gas, the flow velocity of the flowing water, the swirling velocity, and the like. Inside the fluid transfer pipe, a hollow propeller is arranged, and when pressurized gas is sent to the hollow portion of the hollow propeller and ejected from a large number of pores, the hollow propeller itself is in a rotatable state, The hollow propeller is rotated by the intersection with the flowing water, and the jet position of the airflow from the pores is changed with the rotation of the hollow propeller. If the pores are evenly arranged in the radial direction of the fluid transfer tube, air will be ejected at various points in the radial direction of the fluid transfer tube, and air bubbles will be generated evenly by cutting the air flow. The density becomes uniform. In addition, the rotation of the hollow propeller increases the relative speed of the pores and the flowing water, and the bubbles are subdivided.
When the hollow propeller is forcibly rotated by transmitting the rotational force to the hollow propeller through the rotational force transmission system by the operation of the rotary drive source, the hollow propeller is set to a desired rotational speed and pressurized air is supplied. By sending it to the hollow part through the connection housing and the hollow hole and ejecting it from the pores, it is possible to further subdivide the bubbles and generate a large amount of bubbles, and in addition, by the rotation of the hollow propeller, A downstream driving force is applied to the bubbly water mixed fluid to improve the transferability.

[0008]

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

FIG. 1 shows a first embodiment of a microbubble generator according to the present invention. Reference numeral 1 is a pressurized water supply system (pressurized water supply means), and 2 is a pressurized air supply system (pressurized gas supply). (Means), 3 is a fluid transfer pipe, 4 is a swirl vane (swirl flow generating means), 5 is a gas chamber, and 6 is a bubble-mixed water jetting section (bubble-water mixed fluid jetting section).

The pressurized water supply system 1 is, for example, a water inlet provided on the submerged surface of a ship, a pump for absorbing seawater (water) to generate pressurized water, a control means for controlling the flow rate / pressure of the pressurized water, and a water supply pressure. A water supply pressure gauge for measuring water, a liquid meter for measuring the water supply, etc. are applied.
It is connected to the fluid transfer pipe 3.

The pressurized air supply system 2 includes a blower for sucking and pressurizing air (atmosphere), a flow rate control means for controlling the amount of air, a supply pressure gauge for measuring the air pressure, and a supply amount. What has a gas meter etc. for measurement is applied, and the gas chamber 5 is provided by the pressurized gas supply pipe 2a.
Connected to.

The fluid transfer pipe 3 is arranged in a connected state between the pressurized water supply system 1 and the bubble-mixed water jetting part 6, and is provided on the side wall 3a surrounded by the gas chamber 5 in the circumferential direction and the longitudinal direction. The one in which a large number of pores 3b are opened at substantially uniform intervals is adopted. The formation range of the large number of pores 3b is set to be near the downstream position of the swirl vane 4.

The swirl vane 4 is formed by inserting a plurality of vanes in a twisted state into the fluid transfer pipe 3.
It is configured by fixing it integrally.

In the gas chamber 5, an air plenum 5a for storing pressurized air is formed by surrounding the fluid transfer pipe 3 at a position where a large number of pores 3b are formed.

The bubble-mixed water jetting section 6 is arranged on the surface of the hull, which is the surface for friction reduction of a running body such as a ship, and mixes air-water in a desired ratio with a sea-water mixture. In (water), for example, one having a slit-shaped or small-hole-shaped ejection port ejecting obliquely rearward is applied.

In the micro-bubble generator of the example shown in FIG. 1 configured as described above, when the pressurized water supply system 1 is operated, the absorbed water such as seawater is pressurized and sent to the fluid transfer pipe 3. Running water is generated inside the fluid transfer pipe 3. The swirl vanes 4 are provided in the middle of the fluid transfer pipe 3 so that swirl force imparting rotation in the direction of the swirl is imparted to this running water, and a swirling flow as indicated by an arrow is provided downstream of the swirling vanes 4. Since the relative speed of the pores and the flowing water increases, bubbles are easily generated. The bubble-water mixed fluid thus generated is transferred to the bubble-mixed water jetting unit 6 and jetted from the bubble-mixed water jetting unit 6 into seawater (water).

When the pressurized air supply system 2 is operated,
The pressurized air is sent to the air plenum portion 5a of the gas chamber 5 via the pressurized gas supply pipe 2a, and the pressurized air is jetted into the running water from the large number of pores 3b.

In this case, if running water is generated inside the fluid transfer pipe 3, the gas flow ejected from the pores 3b and the swirling flow intersect with each other, and the swirling flow moves at a sufficient speed. At this time, a phenomenon occurs in which the gas flow is cut by the swirling flow. For example, when the diameter of the pores 3b is small and the moving speed of water is high, a large number of small bubbles are generated in the running water because the gas flow is frequently cut in the direction of the swirling flow. In the mixed state, the bubble-water mixed fluid is transferred by the fluid transfer pipe 3 to the bubble-mixed water jetting section 6 at a desired position. It should be noted that the bubbles of the bubble-water mixed fluid have pores 3
The bubble diameter, amount, and bubble rate are set by the size and number of b, the amount of gas, the flow speed of the flowing water, the swirling speed, and the like.

FIG. 2 shows a second embodiment of the device for generating microbubbles according to the present invention, in which a hollow propeller 7 is rotatably arranged inside the fluid transfer pipe 3 shown in FIG. Pressurized air is ejected from the hollow propeller 7. The hollow propeller 7 has a hollow portion 7a into which pressurized air is sent, a large number of pores 7b for communicating the hollow portion 7a with the outside and ejecting the pressurized air into running water, rotation support and pressurization. Hollow propeller shaft 7c for supplying air
And a hollow hole 7d formed in the propeller shaft 7c are applied. The above-mentioned pressurized gas supply pipe 2a is arranged in the fluid transfer pipe 3 in an airtight state and in an inside / outside penetrating state by the penetrating portion 11, and is attached to the support bracket 12 which is arranged integrally with the pressurized gas supply pipe 2a. The swivel joint 13 and the bearing 14 are arranged so that the pressurized gas supply pipe 2a and the hollow portion 7a of the hollow propeller 7 are connected by the swivel joint 13 and the hollow hole 7d.

In the second embodiment, running water as shown by an outlined arrow is formed inside the fluid transfer pipe 3, and the pressurized air from the pressurized air supply system 2 is supplied to the pressurized gas supply pipe. When it is sent to the swivel joint 13 via 2a, the pressurized air is taken over from the non-rotating part to the hollow hole 7d of the propeller shaft 7c, which is the rotating part, and is sent to the hollow part 7a. A split air stream is ejected into the running water to generate bubbles. At this time,
Since the hollow propeller 7 is rotatably supported by the swivel joint 13 and the bearing 14, a rotational force is applied by the intersection with the running water. Therefore, as the hollow propeller 7 rotates, the jet position of the airflow from the pores 7b fluctuates in the circumferential direction. For this reason, the relative speed of the pores and the flowing water is increased, and bubbles are easily generated. When the pores 7b are evenly arranged in the radial direction of the fluid transfer pipe 3, the rotation of the hollow propeller 7 causes the air flow to be ejected at various points on the inner cross section of the pressurized gas supply pipe 2a. The bubbles are uniformly generated by the cutting based on the intersection with the running water, and the bubble-water mixed fluid having the uniform bubble density is sent to the downstream of the fluid transfer pipe 3.

Next, FIG. 3 shows a third embodiment of the micro-bubble generator according to the present invention. In the third embodiment, in addition to the technique of FIG. 2, a rotary drive source 21 arranged outside the fluid transfer pipe 3 for forcibly rotating the hollow propeller 7, and the rotary drive source 21. Insert the rotating force transmission system 22 made of a flexible wire for connecting the hollow propeller 7 and transmitting the rotating force, and the pressurized gas supply pipe 2a and the rotating force transmission system 22 in an airtight / liquid-tight state and a rotation-allowed state. The penetrating portion 11, the connecting housing 23 that allows the rotation of the propeller shaft 7c and is connected to the pressurized gas supply pipe 2a, and the hollow hole 7d of the propeller shaft 7c.
To the inside of the connection housing 23.

In the third embodiment, when the rotary drive source 21 is operated, the rotational force is transmitted to the propeller shaft 7c inside the fluid transfer pipe 3 via the rotational force transmission system 22, so that the hollow propeller 7 is desired. The compressed air from the compressed air supply system 2 is rotated at a rotational speed, and the compressed air from the compressed air supply system 2 passes through the connection housing 23, the connection hole 7e, the hollow hole 7d, and the hollow portion 7a,
By being ejected from b as an air flow, the crossing speed (relative speed) of the air flow and running water in the rotation direction increases, and the air bubbles are further subdivided and the air flow rate limit is reduced. A large amount of bubbles can be generated.
In addition, the rotation of the hollow propeller 7 drives the bubble-water mixed fluid in the downstream direction, thereby improving the transferability.

[0023]

The microbubble generating device according to the present invention has the following effects. (1) A fluid transfer tube having a large number of pores on its side wall,
A swirl flow generating means inserted into the fluid transfer pipe and a pressurized gas supply means for feeding and ejecting pressurized gas from the pores are provided, and the swirling state of the running water is provided to generate a swirling state. It is possible to increase the moving speed of water, frequently cut the air flow, and improve the generation efficiency of the bubbly water mixed fluid. (2) By arranging a hollow propeller inside the fluid transfer pipe, feeding a pressurized gas and jetting it into running water,
It is possible to uniformly mix bubbles in the fluid and make the bubble density in the bubble-water mixed fluid uniform. (3) By placing a hollow propeller inside the fluid transfer pipe and forcibly rotating it by a rotary drive source, the speed of the intersection of the air flow and running water is increased, and the air flow is finely cut to a small diameter. It is possible to generate a large amount of bubbles and increase the amount of bubbles in the bubble-water mixed fluid. (4) By transporting the bubbly water mixed fluid downstream by the rotation of the hollow propeller, the transportability of the bubbly water mixed fluid can be improved. (5) Compared with the technique of blowing bubbles alone, by sending the bubble-water mixed fluid to the friction-reduced portion, the energy consumption for blowing the fluid can be reduced and the practicality at the time of friction reduction can be improved. it can.

[Brief description of drawings]

FIG. 1 is a first microbubble generator according to the present invention.
FIG. 3 is a front sectional view with a block diagram showing an embodiment together.

FIG. 2 is a second microbubble generator according to the present invention.
It is the front view which fractured | ruptured a part which shows an Example.

FIG. 3 is a third embodiment of the microbubble generator according to the present invention.
It is the front view which fractured | ruptured a part which shows an Example.

[Explanation of symbols]

 1 Pressurized Water Supply System (Pressurized Water Supply Means) 2 Pressurized Air Supply System (Pressurized Gas Supply Means) 2a Pressurized Gas Supply Pipe 3 Fluid Transfer Pipe 3a Side Wall 3b Pores 4 Swirling Blades (Swirl Flow Generation Means) 5 Gas Chamber 5a Air plenum 6 Bubble mixed water jetting part (bubble water mixed fluid jetting part) 7 Hollow propeller 7a Hollow part 7b Pore 7c Propeller shaft 7d Hollow hole 7e Connection hole 11 Penetration part 12 Support bracket 13 Swivel joint 14 Bearing 21 Rotational drive source 22 torque transmission system 23 connection housing

Front Page Continuation (72) Inventor Yoshiaki Takahashi 2-1-1 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd. Tokyo No. 1 Factory (72) Inventor Osamu Watanabe 1 Shinshinarahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawajima Harima Heavy Industries Ltd. Technical Research Institute (72) Inventor Hideo Mitsutake 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi Kanagawa Ishikawajima Harima Heavy Industries Ltd. Technical Research Institute (72) Inventor Shoichi Maruyama Isogo-ku, Yokohama-shi Kanagawa Prefecture Shin-Nakahara Town No. 1 Ishi Kawashima Harima Heavy Industries Ltd. Technical Research Institute

Claims (4)

[Claims] 1. A fluid transfer pipe (3) for generating a bubbling water mixed fluid, comprising: a fluid transfer pipe (3) connected to a pressurized water supply means (1) and having a large number of pores (3b) formed in a side wall (3a) thereof. A swirl flow generating means (4) which is disposed inside the fluid transfer pipe and which imparts a swirl flow to the flowing water, and a gas chamber (5) which is disposed around the fluid transfer pipe and is in communication with the pores. )
And a pressurized gas supply means (2) which is connected to the gas chamber and which feeds pressurized gas and ejects it from the pores. 2. A device for generating a bubbling water mixed fluid, comprising a fluid transfer pipe (3) which is connected to a pressurized water supply means (1) and through which pressurized water is inserted, and a surface which is arranged inside the fluid transfer pipe. Many pores (7) communicating with the hollow part (7a)
b) A hollow propeller (7) which is opened and is rotated by crossing with running water, and a pressurized gas supply means (2) which is connected to the hollow portion of the hollow propeller and sends a pressurized gas. Micro bubble generator. 3. A rotational force transmission system (2) for transmitting rotational force by connecting the outside of the fluid transfer pipe (3) and the hollow propeller (7).
The device for generating microbubbles according to claim 2, comprising 2) and a rotary drive source (21) connected to a rotational force transmission system to forcibly rotate the hollow propeller. 4. A propeller shaft (7) of a hollow propeller (7).
A hollow hole (7d) is formed in c), and the propeller shaft (7
The connection housing (23) which allows the rotation of the propeller shaft and is connected to the hollow hole is arranged around c), and the pressurized gas supply means (2) is connected to the connection housing. The device for generating microbubbles according to claim 2 or 3.