JP2009101250A - Fine bubble generating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fine bubble generating apparatus capable of stably generating fine bubbles using a comparatively simple structure and at low cost. <P>SOLUTION: The fine bubble generating apparatus 1 comprises a motor 2, a rotary shaft 4 rotated by the motor 2, a rotary disc 5 attached to the tip end of the rotary shaft 4, a cylinder 6 surrounding the outer periphery of the rotary shaft 4 with a space and having a gas introducing port 10a, a flange 9 attached to the tip end of the cylinder 6 and surrounding the outer periphery of the disc 5 with a gap, and a tubular mesh member 11 extended from the flange 9. The disc 5 is rotated in liquid to allow liquid at the lower end of the disc 5 to flow outward by centrifugal force, this liquid flow is used to suck out gas in the cylinder 6 through the gap between the disc 5 and the flange 9 and mix it with the liquid to form a bubble-mixed liquid flow, and this liquid flow is allowed to impinge on the mesh member 11 to atomize bubbles while being passed through the mesh member 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus and method for generating fine bubbles (microbubbles, nanobubbles) such as air, oxygen, and carbon dioxide in a liquid such as tap water and river water. Furthermore, it is related with the apparatus which discharge | releases a fine bubble in tap water and removes the chlorine content in tap water.

  The fine bubble generating device is known as a device for purifying water by mixing fine bubbles in tap water or river water to increase the amount of dissolved oxygen, for example. The fine bubbles are, for example, bubbles having a diameter of 1 mm or less, a large specific surface area, a long residence time in water, and excellent diffusibility in water. It has the potential to be applied to a wide range of areas such as fisheries and fisheries.

  As such an apparatus, for example, there is an apparatus that generates fine bubbles by sending a pressurized gas into a liquid through a porous body such as ceramic. However, since this apparatus pressurizes gas and sends it into the porous body, a high-output compressor or the like is required, which consumes a lot of energy and increases the size of the apparatus, resulting in high cost.

  Therefore, a device has been proposed in which a rotating body is rotated in a liquid to form a negative pressure state in the liquid, and air is taken into the liquid using the negative pressure (see, for example, Patent Document 1). In this apparatus, it is said that fine air bubbles can be generated in the liquid by taking in air through a fine clearance. It also describes that a bubble crushing means such as a pin mill or a bevel gear is provided in order to further refine the bubbles. However, in this apparatus, it is considered that the bubbles are not sufficiently refined. Further, if a bubble crushing means such as a pin mill or a bevel gear is provided, the apparatus configuration becomes complicated.

JP 2000-15068 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a microbubble generator and the like that can stably generate microbubbles with a relatively simple configuration and low cost.

  The fine bubble generating device of the present invention includes a motor, a rotating shaft rotated by the motor, a rotating disk attached to a tip of the rotating shaft, and a gas introduction port surrounding the outer periphery of the rotating shaft with a space. A flange that is attached to the tip of the cylinder and surrounds the outer periphery of the disk with a small gap, and a cylindrical mesh member provided at the tip of the flange. The disk is rotated in the liquid, and the liquid on the lower surface of the disk is caused to flow outward by centrifugal force, and the liquid is mixed with the liquid while sucking out the gas in the cylinder from the gap between the disk and the flange. Then, a bubble mixed liquid flow is formed, and the bubbles are subdivided while passing the liquid flow through the mesh member.

  According to the present invention, a high-speed liquid flow and a negative pressure state are created in the liquid by the centrifugal force of the rotating disk, and the gas is taken into the liquid using this negative pressure to create a bubble mixed liquid flow. This eliminates the need for high-output compressors and other devices such as those used when using, and allows for downsizing and energy saving of the devices. Further, by applying a high-speed bubble mixed liquid flow to the mesh member, the bubbles are subdivided to generate fine bubbles. At this time, since the high-speed bubble mixed liquid flow hits the mesh member and the speed is lowered, vortex is generated in the liquid, and the liquid surface is less likely to rise or be disturbed. For this reason, it is possible to generate fine bubbles that diffuse almost uniformly in all directions and have a relatively long residence time in the liquid.

  As will be described later, these fine bubbles are released from the daily life by removing chlorine dissolved in tap water into the atmosphere to remove chlorine in tap water, producing oxygen-enriched water and carbonated hot spring water, etc. It can be applied to a wide range of fields.

In the present invention, it is preferable that the mesh member is a plurality of mesh nets stacked.
In this case, since the bubbles can be subdivided every time the mesh net is passed, extremely fine bubbles can be generated.

Furthermore, it is preferable that the opening size of the mesh net is 50 to 500 mesh.
If the opening size of the mesh net is too large, the micronization is insufficient, and if it is too small, the bubble mixture liquid flow is difficult to pass. For this reason, it is preferable that opening size is 50-500 mesh, More preferably, it is 100-400 mesh.

  In the method of generating fine bubbles of the present invention, a rotating disk is placed in a liquid, a flow caused by centrifugal force is applied to the liquid that touches the disk, a gas is mixed in the flow to create a bubble mixed liquid flow, and the bubble mixed liquid It is characterized in that the bubbles are subdivided while passing the flow through the mesh member.

  An apparatus for removing chlorine in water according to the present invention includes a motor, a rotating shaft rotated by the motor, a rotating disk attached to a tip of the rotating shaft, and an air introduction surrounding the outer periphery of the rotating shaft with a space. A cylinder having a mouth, a flange attached to the tip of the cylinder and surrounding the outer periphery of the disk with a small gap, and a cylindrical mesh member provided at the end of the flange. The disk is rotated in water, the water on the lower surface of the disk is caused to flow outward by centrifugal force, and the water is mixed with the water while sucking out the air in the cylinder from the gap between the disk and the flange. A bubble mixed liquid stream is created, and the liquid stream is passed through the mesh member to subdivide the bubbles to generate fine bubbles. And removing the.

  When fine air bubbles are mixed in tap water, the chlorine contained in the tap water dissolves in gaseous form in the fine bubbles. And it is thought that the chlorine content in tap water is removed because this bubble gradually rises and is released into the atmosphere. This underwater chlorine content removal device can be used for drinking water and aquarium fish tanks.

  As is apparent from the above description, according to the present invention, it is possible to provide a device that can generate fine bubbles having a relatively simple structure and low cost, good diffusibility, and a long residence time in the liquid.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1A and 1B are diagrams for explaining an example of a configuration of a microbubble generator according to an embodiment of the present invention. FIG. 1A is a cross-sectional view, and FIG. 1B is a partial cross-sectional view.
The microbubble generator 1 includes a motor 2, a rotating shaft 4 rotated by the motor 2, and a rotating disk 5 attached to the tip of the rotating shaft 4. Furthermore, a cylindrical body 6 that surrounds the outer periphery of the rotary shaft 4 with a space, and a cylindrical mesh member 11 provided at the tip of the cylindrical body 6 are provided.

  A rotating shaft 4 is connected to the output shaft 2 a of the motor 2 via a coupling 3. A rotating disk 5 is attached to the tip of the rotating shaft 4. The rotating disk 5 is a thin conical member that tapers toward the tip. The surface of the disk 5 on the motor 2 side is a flat surface, and the peripheral edge is processed to be sharp. The rotating disk 5 is attached to the tip of the rotating shaft 4 by screwing or an adhesive.

  Between the motor 2 and the rotating disk 5, a cylindrical body 6 surrounding the rotating shaft 4 with a space is attached. The cylindrical body 6 is a member having a shaft hole 6a coaxial with the motor rotation shaft 4, and includes a base portion 7 that covers the motor 2, a central portion 8 that extends along the rotation shaft 4, and a distal end flange portion 9 that projects outward. It consists of. Each part may be an assembly of separately manufactured parts, or each part may be integrally manufactured.

A gas inlet 10 is opened at a portion of the central portion 8 near the base (near the motor 2). The outside of the cylinder 6 communicates with the inside of the shaft hole 6a through the gas inlet 10. The front end flange portion 9 is a short cylindrical portion, and is fitted and fixed to the front end of the central portion 8. The front end surface 9a of the flange portion 9 is inclined in a conical shape so that the center is recessed. A space is formed between the front end surface 9 a and the rotating disk 5. Further, as shown in FIG. 1B, a gap d is opened between the outer peripheral edge at the tip of the flange portion 9 and the outer peripheral edge of the rotary disk 5. The width of the gap d is preferably 1 mm or less with a small device. In order to reduce the size of the mixed bubbles, it is preferable that the gap d is small. In addition, in a large sized apparatus, it is preferable that it is as small as possible with about 5-10 mm or less.
Various types of gas sources can be connected to the gas inlet 10.

  A cylindrical mesh member 11 is attached around the flange portion 9 so as to extend beyond the flange portion 9. The cylindrical mesh member 11 includes, for example, cylindrical mesh nets 12a, 12b, and 12c that are stacked in three layers. The preferred opening size of each mesh net is 50 to 500 mesh, more preferably 100 to 400 mesh.

Next, the operation of this fine bubble generator will be described.
FIG. 2 is a diagram for explaining a usage state of the fine bubble generating device.
First, the rotating disk 5 of the apparatus 1 is held so as to be down, and the rotating disk 5 is submerged in water. At this time, the air inlet 10 of the cylinder 6 is on the water surface. Since a small gap d is opened between the rotating disk 3 and the flange portion 9 of the cylinder 6, the liquid enters the shaft hole 6 a of the cylinder 6 from the gap d. Then, the motor 2 is driven to rotate the rotating shaft 4 to rotate the rotating disk 5. Then, the liquid existing in the vicinity of the disk 5 flows outward at a high speed by the centrifugal force of the rotating disk 5. As a result, the space between the disk 5 and the flange front end surface 9a becomes a negative pressure, and if it is further rotated, it seems that there is no water in the shaft hole 6a. As a result, air is continuously drawn from the air inlet 10 of the cylinder 6 into the cylinder shaft hole 6a.

  The air drawn into the shaft hole 6 a flows outward from the gap d between the rotating disk 5 and the flange portion 9. At this time, air is mixed with the high-speed liquid flow to form a bubble mixed liquid flow. The bubble mixed liquid flow passes through the member while hitting the mesh member 11 arranged around the flange portion 9. At this time, the bubble mixed liquid flow hits the mesh member 11 at a considerably high speed by the high-speed rotation of the rotary disk 5. Since the mesh member 11 is made of the three-layer mesh net 12 as described above, the bubbles are subdivided each time they pass from the inner mesh net 12a to the outer mesh net 12c. It becomes a fine bubble. Since the rotating disk 5 rotates at a high speed, the bubble mixed liquid flow generated by the centrifugal force also rotates in a spiral shape at a considerably high speed, but the speed is alleviated each time it hits the mesh member 11. For this reason, turbulence and liquid disturbance such as a rise in the liquid level do not occur, and fine bubbles uniformly diffuse from the mesh member 11 in all directions.

An application example of the apparatus 1 will be described.
A) Tap water Air is introduced into the tap water stored in the tank or water tank from the gas inlet 10 to generate fine air bubbles in the tap water. Then, the chlorine content contained in tap water dissolves in the form of gas in the fine bubbles. Then, the bubbles gradually rise and are released into the atmosphere, so that the chlorine content in the tap water is removed (the effect will be described later in Examples). In this case, it can be used for drinking water or breeding ornamental fish.
B) Drinking water When an oxygen source (or air) is connected to the gas inlet 10 and oxygen is introduced into the drinking water from the outlet, water in which oxygen is dissolved at a high concentration can be provided. By increasing the dissolved oxygen concentration, an effect such as prevention of growth of anaerobic bacteria can be expected.
C) Bathtub Air is introduced into the hot water stored in the bathtub from the gas inlet 10 to generate fine bubbles in the hot water. When the gas inlet 10 is connected to a carbon dioxide gas source, fine carbon dioxide bubbles are generated in the bath liquid (so-called carbonated hot spring). Such carbon dioxide fine bubbles can be expected to enhance the warm bath effect and promote blood circulation.

  In addition, from the viewpoint of improving the water quality of rivers and lakes, it is also effective as a preventive measure against the occurrence of abnormal fungi and red tide plankton.

  The fine bubble generating device 1 is used by changing the size, shape, output, etc. of the device depending on the type and amount of liquid in the field to which it is applied.

An example in which the microbubble generator 1 is used as an underwater chlorine content removing device will be described.
The underwater chlorine content removing device has the same structure as the fine bubble generating device 1 of FIG. The basic configuration of the device is shown below.
Motor 2: output 200 W, rotation speed (maximum) 5,000 to 6,000 rpm,
Rotating disk 5: diameter 38 mm,
Mesh member 11: Three mesh nets 12 having an opening size of 200 mesh are stacked.

  Using this microbubble generator 1, the chlorine removal effect of tap water was examined. A reagent (residual chlorine test orthotridine solution) was used for detection of the chlorine content. This reagent changes the color of the liquid to yellow when chlorine is present in the liquid, and does not change the color of the liquid when no chlorine is present.

  Store 5 liters of untreated tap water in the aquarium. When this tap water is inspected using a reagent, it turns out to be yellow and it is found that chlorine is contained. Next, as shown in FIG. 2, fine bubbles of air were generated in this tap water by the fine bubble generator 1 for 5 minutes. At this time, water such as mist containing extremely fine bubbles spilled out on the surface of the mesh member 11. And the water containing the bubble spread in the water tank so that it might diffuse up and down. This foggy state did not change much for about 3 minutes even when the operation of the apparatus 1 was stopped.

  When the tap water after the operation treatment was inspected using a reagent, it was confirmed that the chlorine content was removed without discoloration. This is considered to be because chlorine in tap water melts into fine bubbles in a gaseous state, and the bubbles gradually rise and are released into the atmosphere, so that chlorine in tap water is removed. In addition, although the mesh member 11 was removed and the apparatus 1 was drive | operated, the bubble size did not become fine and the removal of the chlorine content was inadequate even after the operation for the same time.

  When this apparatus is used for removing chlorine in drinking water, a necessary amount of tap water is once stored in a tank or the like, and the fine bubble generating apparatus is operated for a predetermined time and then used.

It is a figure explaining an example of the composition of the fine bubble generating device concerning an embodiment of the invention, and Drawing 1 (A) is a sectional view and Drawing 1 (B) is a partial sectional view. It is a figure explaining the use condition of a microbubble generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine bubble generator 2 Motor 3 Coupling 4 Rotating shaft 5 Rotating disk 6 Cylindrical body 7 Base part 8 Center part 9 Flange part 10 Gas inlet 11 Mesh member 12 Mesh net | network

The method of generating fine bubbles according to the present invention is to place a rotating disk in a liquid, create an outward flow and a negative pressure state due to centrifugal force in the liquid touching the disk, and take in the gas into the liquid using this negative pressure. A bubble-containing liquid flow is formed by the method, and the bubbles are subdivided while passing the bubble-containing liquid flow through a mesh member.

The present invention, in the liquid, such as tap water or river water, relates to air or oxygen, equipment for generating fine bubbles such as carbon dioxide (microbubbles, nanobubbles).

A motor, a rotating shaft rotated by the motor, a rotating disk attached to a tip of the rotating shaft, a cylinder having a gas introduction port surrounding the outer periphery of the rotating shaft with a space, and the cylinder A flange that is attached to the tip of the disk and surrounds the outer peripheral edge of the disk with a gap therebetween, and a cylindrical mesh member provided so as to extend first from the periphery of the flange. The liquid on the lower surface of the disk is caused to flow outward by centrifugal force, and the liquid is mixed with the liquid while sucking out the gas in the cylinder from the gap between the disk and the flange. A liquid flow is created, and bubbles are subdivided while passing the liquid flow through the mesh member.

The method of generating fine bubbles related to the present invention is to place a rotating disk in a liquid and apply a flow by centrifugal force to the liquid that touches the disk, and mix the gas into the flow to create a bubble-containing liquid flow. It is characterized in that the bubbles are subdivided while passing the mixed liquid flow through the mesh member.

An underwater chlorine content removal device related to the present invention includes a motor, a rotating shaft rotated by the motor, a rotating disk attached to a tip of the rotating shaft, and surroundings an outer periphery of the rotating shaft with a space therebetween, A cylinder having an air inlet, a flange attached to the tip of the cylinder and surrounding the outer periphery of the disk with a small gap, and a cylindrical mesh member provided at the end of the flange; The disk is rotated in water, the water on the lower surface of the disk is caused to flow outward by centrifugal force, and the water and the water are sucked out from the gap between the disk and the flange by this water flow. A bubble mixed liquid stream is made by mixing, and fine bubbles are generated by subdividing the bubbles while passing the liquid stream through the mesh member. It is characterized by removing the element.

Claims (5)

A motor,
A rotating shaft rotated by the motor;
A rotating disk attached to the tip of the rotating shaft;
A cylinder having a gas inlet, surrounding the outer periphery of the rotating shaft with a space;
A flange attached to the tip of the cylindrical body and surrounding the outer periphery of the disk with a small gap;
A cylindrical mesh member provided at the tip of the flange;
Comprising
The disk is rotated in the liquid, the liquid on the lower surface of the disk is caused to flow outward by centrifugal force, and the liquid is mixed with the liquid while sucking out the gas in the cylinder from the gap between the disk and the flange. A fine bubble generating apparatus characterized in that a bubble mixed liquid flow is formed and bubbles are subdivided while passing the liquid flow through the mesh member.   2. The fine bubble generating apparatus according to claim 1, wherein the mesh member is a plurality of mesh nets stacked.   The fine bubble generator according to claim 2, wherein the mesh net has an opening size of 50 to 500 mesh. A rotating disk is placed in the liquid, and a centrifugal force is applied to the liquid that touches the disk.
Gas is mixed in this flow to create a bubble-containing liquid flow,
A method of generating fine bubbles, wherein the bubbles are subdivided while the bubble mixed liquid flow is applied to a mesh member. A motor,
A rotating shaft rotated by the motor;
A rotating disk attached to the tip of the rotating shaft;
A cylinder having an air inlet, surrounding the outer periphery of the rotating shaft with a space;
A flange attached to the tip of the cylindrical body and surrounding the outer periphery of the disk with a small gap;
A cylindrical mesh member provided at the tip of the flange;
Comprising
The disk is rotated in water, the water on the lower surface of the disk is caused to flow outward by centrifugal force, and the water is mixed with the water while sucking out the air in the cylinder from the gap between the disk and the flange. A mixed liquid flow is created, fine bubbles are generated by subdividing the bubbles while passing the liquid flow through the mesh member, and the chlorine content in the water is removed by the fine bubbles. Removal device.

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