JP5257586B2 - Swivel type micro bubble generator - Google Patents

Description

  The present invention is used in a microbubble generator for generating microbubbles, accepts a gas-liquid mixed fluid, and refines the gas contained in the gas-liquid mixed fluid so that the diameter of the bubbles becomes nano level. The present invention relates to a swirl type fine bubble generator.

  Conventionally, as a microbubble generator, for example, as described in JP-A-2003-117368, air is introduced into a pump for supplying liquid together with liquid, and a gas-liquid mixed fluid containing bubbles in the pump It is known that this gas-liquid mixed fluid is introduced into a cylindrical swirling fine bubble generator, swirled in the generator and then discharged to make the bubbles finer Yes.

  In that case, an inlet for the gas-liquid mixed fluid is provided near one end wall of the cylindrical swirling fine bubble generator, the gas-liquid mixed fluid is introduced into the generator through the inlet, and the introduced gas-liquid mixed fluid is introduced. Are moved in the axial direction toward the other end wall while swirling in the generator, and discharged from a discharge port provided in the other end wall, so that the bubbles are made finer.

  As another swirling microbubble generator, a gas-liquid mixed fluid introduction port is provided in the axial middle portion of the cylindrical swirling microbubble generator, and the gas-liquid mixed fluid is introduced into the generator through the inlet. The introduced gas mixture fluid is divided into two in the generator and moved toward the both end walls while being swung, and discharged to the outside from the respective discharge ports provided on both end walls. Thus, there is also disclosed one in which bubbles are made finer.

JP 2003-117368 A

Problems to be solved by the invention

  However, in the above-described swirling type fine bubble generator, all of the bubbles contained in the fluid are refined by generating a swirling flow in the gas-liquid mixed fluid. The current situation is that the gas contained in the fluid has not been miniaturized efficiently so that the diameter of the bubbles is at the nano level.

  Accordingly, the present invention can efficiently generate bubbles at the nano level by speeding up the swirling flow of the gas-liquid mixed fluid by devising the shape of the internal space in the cylindrical member that receives the gas-liquid mixed fluid. An object of the present invention is to provide a swirling fine bubble generator that can be used.

Means for solving the problem

In order to solve the above-mentioned problem, the invention described in claim 1 of the present application is a swirling fine bubble generator for receiving a gas-liquid mixed fluid and miniaturizing a gas contained in the gas-liquid mixed fluid. The first side of the first inner peripheral surface with a predetermined length and the maximum inner diameter provided at a position approximately one third of the length in the longitudinal direction and one end of the first inner peripheral surface are continuous. a second inner peripheral surface of the 截 head conical, and a third inner peripheral surface of the short-sized side 截 head conical progressively decreasing diameter enough to lead to continuous and the other end forward to the other end of the inner first peripheral surface A cylindrical member having a first end wall that closes the open end of the second inner peripheral surface, and a second end wall that closes the open end of the third inner peripheral surface. A fluid introduction port for introducing the mixed fluid from the tangential direction is provided, and a fluid discharge port penetrating the second end wall is provided on the central axis of the cylindrical member. It is characterized in that is.

  Further, the invention according to claim 2 of the present application is the configuration according to claim 1, wherein the second and third inner peripheral surfaces are respectively provided on the first inner peripheral surface side of the second inner peripheral surface and the third inner peripheral surface. Spiral grooves that guide the gas-liquid mixed fluid introduced into the cylindrical member toward the first end wall and the second end wall while swirling are formed at approximately half the length. And

Effect of the invention

According to the present invention, the configuration described above, the gas-liquid mixed fluid introduced into the cylindrical inner member from the fluid inlet port, by chromatography tapered surface of the second inner peripheral surface of many of elongated side 截 head conical The swirl flow is advanced while increasing the speed toward the first end wall that is throttled and has no discharge port, and is reversed toward the center of the cylindrical member in the radial direction by the first end wall to further increase the swirl speed. However, it passes through the central part of the cylindrical member toward the second end wall and is discharged from the fluid discharge port to the outside. In particular, when the gas-liquid mixed fluid inverted by the first end wall passes through the central part of the cylindrical member toward the second end wall, the turning radius of the gas-liquid mixed fluid is larger than when the gas-liquid mixed fluid moves toward the first end wall. Since it becomes smaller, the flow velocity becomes higher and the swivel moves. And, many gas-liquid mixture the swirling flow velocity is faster, short-sized side 截 head conical third inner peripheral surface swirl flow while increasing speed toward the second end wall is squeezed by the tapered surface of Since the remaining gas-liquid mixed fluid that has progressed and merged and discharged to the outside from the liquid discharge port, the gas-liquid mixed fluid has a larger mixing force of the gas contained in the liquid, and its fragmentation Effectively, nanovalves can be generated efficiently.

  In addition, the gas and liquid introduced into the cylindrical member at approximately half the length of each of the second and third inner peripheral surfaces on the first inner peripheral surface side of the second inner peripheral surface and the third inner peripheral surface, respectively. If the spiral grooves that guide the fluid mixture to turn toward the first end wall and the second end wall are formed, respectively, the spiral grooves provided on the tapered surfaces of the second and third inner peripheral surfaces The gas-liquid mixed fluid introduced from the fluid introduction port into the cylindrical member is smoothly and well swirled with respect to the second inner peripheral surface and the third inner peripheral surface to the first end wall and the second end wall. It is possible to guide the vehicle to head, and the flow velocity can be further increased. As a result, the mixing force of the gas contained in the liquid is increased, and the fragmentation is further effectively performed, and the nanovalve can be generated more efficiently.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view of a fine bubble generator to which a swirl type fine bubble generator according to the present invention is applied. This fine bubble generator 1 is a mixture of a gas such as air and a liquid such as water. A liquid mixture tank 2 for storing a gas-liquid mixed fluid, a first pump 3 for sucking air and sending the air to the liquid mixture tank 2, and for sucking and circulating the gas-liquid mixed fluid in the liquid mixture tank 2 The second pump 4 and the swirl type fine for receiving the gas-liquid mixed fluid discharged by the second pump 4 and miniaturizing the gas contained in the gas-liquid mixed fluid so that the diameter of the bubbles becomes nano level. A bubble generator 5 is provided.

  The first pump 3 is connected to a first pipe 6 having a tip opened in the mixed liquid tank 1 and sending gas into the liquid or gas-liquid mixed fluid. The second pump 4 is connected to a second pipe 7 having one end opened in the mixed liquid tank 1 for sucking the gas-liquid mixed fluid, and between the second pump 4 and the swirling fine bubble generator 5. A third pipe 8 is connected to supply the gas-liquid mixed fluid discharged from the second pump 4 to the swirling fine bubble generator 5. Further, the swirl type fine bubble generator 5 is disposed in the gas-liquid mixed fluid of the mixed liquid tank 2.

Then, as shown in FIGS. 2 and 3, the swirl type fine bubble generator includes a first inner peripheral surface 51 having a predetermined length and a maximum inner diameter provided at a position approximately one third of the length direction, a second inner peripheral surface 52 of the continuous and becomes increasingly small extent reach the one end side front elongated side 截 head conical end of the peripheral surface 51, a continuous and the other end to the other end of the first inner peripheral surface 51 a tubular member 50 and a third inner peripheral surface 53 of the part length side 截 head conical progressively decreasing diameter enough to reach the side front, a first end wall 54 closing the open end of the second inner peripheral surface 52, And a second end wall 55 that closes the open end of the third inner peripheral surface 53. Further, a fluid introduction port 56 for introducing the gas-liquid mixed fluid from the tangential direction is provided in the first inner peripheral surface 51 portion, and penetrates the second end wall 55 on the central axis a of the cylindrical member 50. A fluid outlet 57 is provided.

  In addition, the length of the second inner peripheral surface 52 is approximately 2 to 1 with respect to the length of the third inner peripheral surface 53, and both tapers of the second inner peripheral surface 52 and the third inner peripheral surface 53 are provided. The second and third inner peripheral surfaces 52, 52 are formed on the first inner peripheral surface 51 side of the second inner peripheral surface 52 and the third inner peripheral surface 53, respectively. While the gas-liquid mixed fluid introduced into the cylindrical member 50 is swirled in a balanced and smooth manner with respect to the second inner peripheral surface 52 and the third inner peripheral surface 53 at a position approximately half the length of the first end 53. Spiral grooves 58 and 59 are formed to guide the wall 54 and the second end wall 55, respectively.

  Note that the motor speed of the first pump 3 is variable, and the amount of air fed into the liquid mixture tank 1 is adjusted by changing the motor speed.

  Next, the operation of the fine bubble generator 1 to which the above-described swirling fine bubble generator 5 is applied will be described.

  First, a gas such as air is sent from the first pump 3 to a liquid such as water stored in the liquid mixture tank 2, and the liquid and gas are preliminarily mixed in the liquid mixture tank 2 in advance. A liquid mixed fluid is created.

  Next, the gas-liquid mixed fluid in the mixed liquid tank 2 is sucked by the second pump 4 and discharged from the discharge port of the pump 4, so that the gas-liquid mixed fluid passes through the third pipe 8 and turns finely. It is press-fitted into the bubble generator 5. In the swirling fine bubble generator 5, the press-fitted fluid is mixed and turned into a swirling flow, which is ejected from the fluid discharge port 57 into the liquid in the liquid mixture tank 2.

In that case, pivoting the gas-liquid mixed fluid introduced from the fluid inlet 56 of the micro-bubble generator 5 to the tubular member 50 has many of elongated side 截 head conical taper of the second inner peripheral surface 52 It progresses as a swirl flow while increasing the speed toward the first end wall 54 that is squeezed by the surface and has no discharge port, and reverses while being directed toward the radial center of the cylindrical member 50 by the first end wall 54, While further increasing the turning speed, it passes through the central portion of the cylindrical member 50 toward the second end wall 55 and is discharged from the fluid discharge port 57 to the outside. In particular, when going to the second end wall 55 through the center of the cylindrical member 50, the swirl rotation radius of the gas-liquid mixed fluid becomes smaller than when going to the first end wall 54, so that the flow velocity is even higher. It becomes. On the other hand, it travels a remaining gas-liquid mixture fluid even short-sized side 截 head conical swirl flow while increasing speed throttled toward the second end wall 55 by the tapered surface of the third inner peripheral surface 53, the second The end wall 55 is directed toward the center of the cylindrical member 50 in the radial direction, and merges with a large amount of gas-liquid mixed fluid that passes through the center of the cylindrical member 50 and travels toward the liquid discharge port 57. Is discharged.

  As described above, the gas-liquid mixed fluid introduced from the fluid introduction port 56 into the cylindrical member 50 is throttled by the tapered surfaces of the second inner peripheral surface 52 and the third inner peripheral surface 53 to be first end. The wall 54 and the second end wall 55 advance in a swirl flow while actively increasing the speed, and then move toward the second end wall 55 while increasing the swirl speed through the center of the cylindrical member 50. The remaining gas-liquid mixed fluid directly toward the second end wall 55 joins the gas-liquid mixed fluid and is discharged to the outside from the fluid discharge port 57, so that the gas-liquid mixed fluid is included in the liquid. The mixing force of the gas increases, and the fragmentation is more effectively performed to efficiently generate nanovalves.

  In addition, the angles of both tapered surfaces of the second inner peripheral surface 52 and the third inner peripheral surface 53 are formed to be substantially the same, and the first inner periphery of each of the second inner peripheral surface 52 and the third inner peripheral surface 53 is provided. The first end wall while actively swirling the gas-liquid mixed fluid fed into the cylindrical member 50 at a position approximately half the length of each of the second and third inner peripheral surfaces 52 and 53 on the surface 51 side. 54 and the spiral groove portions 58 and 59 that are guided toward the second end wall 55 are formed, respectively, and the combination of the tapered surface structure of the second and third inner peripheral surfaces and the spiral groove portions 58 and 59 is in phase. The first end wall while the gas-liquid mixed fluid introduced into the cylindrical member 50 from the fluid introduction port 56 is swirled in a balanced and smooth manner with respect to the second inner peripheral surface 52 and the third inner peripheral surface 53. 54 and the second end wall 55 can be guided, and the flow velocity is further increased. It can be. As a result, the mixing force of the gas contained in the liquid is increased, and the fragmentation is performed more effectively, and the nanovalve can be generated more efficiently.

  4 and 5 show another embodiment, and a second swirl type fine bubble generator is further provided between the second pump 4 and the swirl type fine bubble generator 5 of the above-described embodiment. 5A is attached. Thereby, by passing the gas-liquid mixed fluid discharged from the second pump 4 through the plurality of swirling fine bubble generators 5 and 5A, the gas mixing contained in the liquid is doubled, and the bubbles at the nano level Is generated more efficiently.

  In this case, the structure and action of the second swirling fine bubble generator 5A are the same as those of the swirling fine bubble generator 5 as shown in FIG. Only the reference numerals of the portions are given, and the detailed description thereof is omitted. In FIG. 4, a second swirling fine bubble generator 5 </ b> A that is larger than the swiveling fine bubble generator 5 is used.

  According to such a configuration, the gas-liquid mixed fluid discharged from the discharge port of the second pump 4 is first press-fitted into the second swirling fine bubble generator 5A, and the previous fluid is generated in the generator 5A. As with the swirling fine bubble generator 5, swirling and mixing is performed at a high speed, thereby forming bubbles at the nano level. Next, the gas-liquid mixed fluid discharged from the fluid discharge port 57 </ b> A after being bubbled at the nano level is further press-fitted into the first swirling fine bubble generator 5, and again in the generator 5. By swirling and mixing at a high speed, the gas mixing contained in the liquid is doubled. Then, the gas-liquid mixed fluid that has been bubbled again at the nano level in this manner is ejected from the fluid discharge port 57 to the mixed liquid tank 2.

  In the above-described embodiment, the description has been made on the case where water is used as the liquid and air is used as the gas. However, it is needless to say that the present invention can be applied to liquids other than water and gases other than air.

Further, in the swirling fine bubble generator shown in FIG. 2, the inner diameter d of the first inner peripheral surface 51 is formed slightly longer than the length L of the second inner peripheral surface, and each taper surface angle θ is set to about 30 °. Although set by a mixed ratio of liquids or gases, for example, the inner diameter d ₁ of the first inner peripheral surface and set slightly shorter than the length L ₁ of the second inner peripheral surface, or both tapered surface angle theta 20 The taper surface angle θ may be set to a slightly different angle. If the taper surface angle θ is increased and the inner diameter (circumference) of the smallest part of the second and third inner peripheral surfaces is made smaller than the inner diameter (circumference) of the first inner peripheral surface, the swirl flow speed is further increased. Will be able to.

  It is a schematic explanatory drawing of the fine bubble generator provided with the turning type fine bubble generator which concerns on this invention.   It is a longitudinal cross-sectional view of a turning type fine bubble generator.   It is the same side view.   It is a schematic explanatory drawing of the fine bubble generator provided with two turning type fine bubble generators.   It is a longitudinal cross-sectional view of a 2nd turning type | formula fine bubble generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine bubble generator 5 Swivel type | formula fine bubble generator 50 Cylindrical member 51 1st inner peripheral surface 52 2nd inner peripheral surface 53 3rd inner peripheral surface 54 1st end wall 55 2nd end wall 56 Fluid inlet 57 Fluid Discharge port 58 Spiral groove 59 Spiral groove

Claims (1)

A swirl type fine bubble generator for receiving a gas-liquid mixed fluid and refining a gas contained in the gas-liquid mixed fluid, and is a maximum at a predetermined length provided at a position approximately one third of the length direction. a first inner peripheral surface of the inner diameter, continuous and with progressively smaller diameter to become elongated side 截 head the second inner peripheral surface of the conical enough to reach the one end forward, within the first peripheral surface of one end of the inner first peripheral surface the closing and the cylindrical member having the other end to the continuous and becomes increasingly small extent reach the other end the front part length side 截 head third inner peripheral surface of the conical, the open end of the inner second peripheral surface A first end wall and a second end wall that closes the open end of the third inner peripheral surface are provided, and a fluid inlet for introducing the gas-liquid mixed fluid from the tangential direction is provided in the first inner peripheral surface portion. In addition, a fluid discharge port penetrating the second end wall is provided on the central axis of the cylindrical member.

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