JP2007307450A - Bubble generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bubble generating device which generates fine bubbles efficiently with a low cost. <P>SOLUTION: The bubble generating device is provided with a pump, a liquid supply hose 12 and a bubble generating vessel 13. The liquid 22 sent out by the pump is introduced to the bubble generating vessel 13 with the liquid supply hose. In the bubble generating vessel 13, an opening part 31a, an approximately conical liquid introduction part 31, a liquid acceleration part 32, a first swelling part 33, a second swelling part 34 and a third swelling part 41 are formed. The section area of the liquid acceleration part 32 is smaller than those of the opening part 31a and the first swelling part 33. In the bubble generation vessel 13, a gas passage 35 for supplying air into the liquid acceleration part 32 is formed. The gas passage 35 is formed with an inclined state against the liquid acceleration part 32. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bubble generating device that generates fine bubbles in water.

  Conventionally, an apparatus for generating fine bubbles in water has been proposed for breeding aquatic organisms or purifying sewage.

For example, in an ejector structure in a water treatment device or the like described in Patent Document 1, a scattering cylinder having a diameter larger than that of the nozzle body is fixed to the tip of the nozzle body. Moreover, the air hose is connected with the scattering cylinder. In such a configuration, the water ejected from the nozzles is scattered in the scattering cylinder, and air is sent into the scattering cylinder, thereby generating bubbles in the water.
JP-A-5-345193

  By the way, in the structure of patent document 1, it is thought that the air in an air hose is attracted | sucked in a scattering cylinder by the flow of the water in a scattering cylinder. However, a sufficient negative pressure cannot be generated in the scattering cylinder by only the flow of water, and a sufficient amount of air cannot be fed into the scattering cylinder.

  So, in the water treatment apparatus of patent document 1, the air blower is connected to the end of the air hose, and air is forced in into the scattering cylinder. However, in this case, problems such as securing a space for installing the blower and increasing costs due to the installation of the blower occur. Moreover, in the structure of patent document 1, the bubble which generate | occur | produced in water cannot fully be refined | miniaturized.

  An object of the present invention is to provide a bubble generating device that can efficiently generate fine bubbles at low cost.

  (1) A bubble generation device according to the present invention is a bubble generation device that generates bubbles in a liquid, and includes a main body portion having an inflow port through which the liquid flows in and an outflow port through which the liquid flows out. In addition to having a liquid channel that communicates from the inlet to the outlet, it also has a gas channel that guides gas to the liquid channel. The liquid channel flows from the inlet to the liquid introduction part, the liquid acceleration part, and the expansion part. The liquid acceleration part has a smaller cross-sectional area than the expansion part in a direction perpendicular to the liquid traveling direction, and the liquid acceleration part and the expansion part have a cross-sectional area in the perpendicular direction in the direction perpendicular to the liquid traveling direction. It expands discontinuously from the part to the expansion part, and the end of the gas channel communicates with the liquid acceleration part.

  In the bubble generating device, the liquid that has flowed into the main body from the inflow port sequentially passes through the liquid introduction unit, the liquid acceleration unit, and the expansion unit, and then flows out from the outflow port. The liquid acceleration part communicates with the end of the gas flow path. In the direction perpendicular to the liquid traveling direction, the cross-sectional area of the liquid acceleration part is smaller than the cross-sectional area of the expansion part.

  In this case, the flow rate of the liquid in the liquid acceleration part can be made higher than the flow rate of the liquid in the liquid expansion part. Thereby, the gas in the gas flow path can be efficiently sucked into the liquid accelerating portion by the ejector effect.

  Further, since the cross-sectional area of the liquid accelerating portion is smaller than that of the expanding portion, the pressure of the liquid in the liquid accelerating portion can be made lower than the pressure of the liquid in the liquid expanding portion. Thereby, the inside of a liquid acceleration part becomes a negative pressure, and the gas in a gas flow path can be sucked into a liquid acceleration part more efficiently.

  As a result, the gas can be efficiently sucked into the main body without using a separate device. Thereby, bubbles can be efficiently generated in the liquid in the liquid accelerating portion.

  Moreover, the cross-sectional areas in the vertical direction of the liquid acceleration part and the expansion part discontinuously increase from the liquid acceleration part to the expansion part. That is, the cross-sectional area in the perpendicular direction increases rapidly from the liquid acceleration part to the expansion part. In this case, shock waves and resonance occur in the liquid at the boundary between the liquid acceleration part and the expansion part. Thereby, the bubbles generated in the liquid in the liquid accelerating portion can be further miniaturized.

  As a result, fine bubbles can be generated efficiently at low cost.

  (2) The cross-sectional area in the vertical direction of the liquid acceleration unit may be smaller than the area of the inflow port.

  In this case, the flow rate of the liquid in the liquid accelerating unit can be made higher than the flow rate of the liquid when flowing into the liquid channel from the inflow port. Further, the pressure of the liquid in the liquid accelerating portion can be made lower than the pressure of the liquid when flowing into the liquid flow path from the inflow port. As a result, the gas can be reliably sucked into the liquid acceleration part.

  (3) The bubble generating device may further include an introduction pipe that guides the liquid to the inflow port, and a cross-sectional area in the vertical direction of the liquid acceleration unit may be smaller than a cross-sectional area of the introduction pipe.

  In this case, the flow rate of the liquid in the liquid acceleration unit can be made higher than the flow rate of the liquid in the introduction tube. Further, the pressure of the liquid in the liquid accelerating portion can be made lower than the pressure of the liquid in the introduction pipe. As a result, the gas can be more reliably sucked into the liquid acceleration unit.

  (4) In the joining part of the liquid acceleration part and the gas flow path, the angle between the liquid acceleration part and the gas flow path on the upstream side of the joining part may be less than 90 degrees.

  In this case, in the vicinity of the junction, the gas in the gas flow path moves in a direction from the upstream side to the downstream side of the liquid acceleration unit. Thereby, the gas in the gas channel can be efficiently moved into the liquid accelerating portion along the flow of the liquid. As a result, fine bubbles can be generated more efficiently.

  (5) The cross-sectional area of the inflating part in the vertical direction may increase stepwise toward the downstream side.

  In this case, shock waves and resonance can be continuously generated in the liquid in the expansion portion. Thereby, the bubbles generated in the liquid in the liquid accelerating portion can be efficiently miniaturized.

  (6) The inflating portion has a first cylindrical space having a first inner diameter, a second cylindrical space having a second inner diameter larger than the first inner diameter, and a second larger than the second inner diameter. And a third cylindrical space having an inner diameter of three.

  In this case, shock waves and resonance can be generated in the liquid at the boundary between the first cylindrical space and the second cylindrical space and at the boundary between the second cylindrical space and the third cylindrical space. Thereby, bubbles generated in the liquid in the liquid accelerating portion can be further miniaturized.

  (7) The area of the outflow port may be smaller than the cross-sectional area in the perpendicular direction of the downstream end of the expansion portion.

  In this case, the flow rate of the liquid can be increased at the outflow port, and the flow rate of the liquid can be drastically decreased when the liquid flows out from the outflow port. As a result, the bubbles can be sufficiently miniaturized.

  (8) The bubble generation device may further include a sphere provided in the expansion portion.

  In this case, the pressure and flow velocity of the liquid in the inflating portion change depending on the sphere. Thereby, a shock wave and resonance are generated in the liquid in the inflating portion. As a result, the bubbles can be further miniaturized more efficiently.

  (9) The bubble generating device may further include a pump for sending the liquid to the introduction pipe.

  In this case, the flow rate and pressure of the liquid in the introduction pipe can be increased by the pump. Thereby, the flow velocity of the liquid in the liquid accelerating portion can be further increased, and the inside of the liquid accelerating portion can be reliably set to a negative pressure. As a result, fine bubbles can be generated more reliably.

  Further, the liquid can be stably supplied into the introduction pipe by the pump. Thereby, fine bubbles can be generated stably.

  According to the present invention, the flow rate of the liquid in the liquid acceleration unit can be increased. Thereby, the gas in the gas channel can be efficiently sucked into the liquid accelerating portion.

  Further, the pressure of the liquid in the liquid accelerating portion can be lowered. Thereby, the inside of a liquid acceleration part becomes a negative pressure, and the gas in a gas flow path can be sucked into a liquid acceleration part more efficiently.

  In addition, shock waves and resonance occur in the liquid at the boundary between the liquid acceleration part and the expansion part. Thereby, the bubbles generated in the liquid in the liquid accelerating portion can be further miniaturized.

  As a result, fine bubbles can be generated efficiently at low cost.

  Hereinafter, a bubble generating apparatus according to an embodiment of the present invention will be described with reference to the drawings.

(1) 1st Embodiment (a) Structure of bubble generator FIG. 1: is a schematic diagram which shows the bubble generator which concerns on the 1st Embodiment of this invention. As shown in FIG. 1, the bubble generation device 10 according to the present embodiment includes a pump 11, a liquid supply hose 12, a bubble generator 13, a gas supply hose 14, and a liquid suction hose 15.

  The bubble generator 13 is arranged in the lower part in the storage tank 21. A liquid 22 is stored in the storage tank 21. The liquid 22 is, for example, seawater, lake water, sewage, sewage, or the like.

  One end of the liquid suction hose 15 is connected to a liquid supply source (not shown), and the other end is connected to the suction port of the pump 11. One end of the liquid supply hose 12 is connected to the discharge port of the pump 11, and the other end is connected to the bubble generator 13. One end of the gas supply hose 14 is connected to the bubble generator 13, and the other end is opened in the atmosphere.

  By operating the pump 11, the liquid 22 delivered from the pump 11 is injected into the storage tank 21 via the liquid supply hose 12 and the bubble generator 13. Here, air is supplied into the bubble generator 13 via the gas supply hose 14. At this time, fine bubbles are generated in the liquid 22 in the bubble generator 13. Therefore, the liquid 22 supplied into the storage tank 21 contains fine bubbles. Hereinafter, the bubble generator 13 will be described in detail with reference to the drawings.

(B) Configuration of Bubble Generator FIG. 2 is a cross-sectional view of the bubble generator 13 of FIG.

  As shown in FIG. 2, the bubble generator 13 includes a cylindrical first bubble generation unit 30 and a cylindrical second bubble generation unit 40.

  One end side of the first bubble generating unit 30 is connected to the liquid supply hose 12. Further, the other end side of the first bubble generating unit 30 is fitted into one end side of the second bubble generating unit 40.

  On one end side in the first bubble generating section 30, a substantially conical liquid introduction section 31 having a gradually decreasing diameter toward the other end side is formed. One end of the liquid introduction part 31 forms a circular opening 31 a at one end of the first bubble generation part 30.

  In the first bubble generating unit 30, the other end side of the liquid introducing unit 31 has a cylindrical liquid accelerating unit 32 having a circular cross section having a smaller diameter than the opening 31 a and a circular cross section having a larger diameter than the liquid accelerating unit 32. A cylindrical first inflatable portion 33 and a cylindrical second inflatable portion 34 having a circular cross section having a larger diameter than that of the first inflatable portion 33 are sequentially formed.

  In addition, a gas flow path 35 for supplying air into the liquid accelerating unit 32 is formed in the first bubble generating unit 30. One end of the gas flow path 35 opens at the outer peripheral portion of the first bubble generation unit 30 and is connected to the gas supply hose 14. The gas flow path 35 is formed to be inclined with respect to the liquid acceleration unit 32 in the first bubble generation unit 30. In the example of FIG. 2, the gas flow path 35 is formed so as to be inclined 60 degrees toward the liquid introduction part 31 with respect to the direction perpendicular to the axial direction of the liquid acceleration part 32.

  A cylindrical third inflating portion 41 having a circular cross section larger in diameter than the second inflating portion 34 is formed in the second bubble generating portion 40. In addition, the other end side of the second bubble generation unit 40 is connected to the third expansion unit 41 and the outside of the second bubble generation unit 40 and has a circular cross section having a smaller diameter than the third expansion unit 41. A communication hole 42 is formed. One end of the communication hole 42 forms a liquid discharge port 43 on the other end side of the second bubble generating unit 40.

(C) Effect of this Embodiment With the above configuration, the liquid 22 flowing from the liquid supply hose 12 into the bubble generator 13 is provided with the opening 31a, the liquid acceleration unit 32, and the first to third expansion units 33 and 34. , 41 and the communication hole 42 are ejected from the liquid discharge port 43 into the storage tank 21 (FIG. 1). In addition, the air in the gas flow path 35 is sucked into the liquid acceleration unit 32 by the ejector effect.

  Here, the opening 31a, the liquid introduction part 31, the liquid acceleration part 32, and the first to third expansion parts 33, 34, and 41 are collectively referred to as a liquid flow path. In this case, the cross-sectional area of the liquid accelerating unit 32 is smaller than the cross-sectional area of the other part of the liquid channel. Therefore, the flow velocity of the liquid 22 in the liquid accelerating unit 32 is highest in the liquid flow path. In this case, the air in the gas flow path 35 is efficiently sucked into the liquid acceleration unit 32 along the flow of the liquid 22.

  Further, since the cross-sectional area of the liquid accelerating unit 32 is smaller than the cross-sectional area of the other part of the liquid channel, the pressure of the liquid 22 in the liquid accelerating unit 32 is the lowest in the liquid channel. Thereby, the inside of the liquid acceleration part 32 becomes a negative pressure, and air is sucked into the liquid acceleration part 32 through the gas supply hose 14 and the gas flow path 35 more efficiently.

  Further, the cross-sectional area of the liquid acceleration unit 32 is smaller than the cross-sectional area of the liquid supply hose 12. In this case, the flow rate of the liquid 22 in the liquid acceleration unit 32 is higher than the flow rate of the liquid 22 in the liquid supply hose 12. In addition, the pressure of the liquid 22 in the liquid acceleration unit 32 is lower than the pressure of the liquid 22 in the liquid supply hose 12. As a result, the air in the gas flow path 35 can be reliably sucked into the liquid acceleration unit 32.

  In addition, the gas flow path 35 is connected to the liquid accelerating unit 32 so that the traveling direction of air in the gas flow path 35 is the direction from one end side to the other end side of the bubble generator 13, similarly to the liquid 22. In contrast, it is inclined. In this case, the air in the gas flow path 35 can be efficiently moved into the liquid acceleration unit 32 along the flow of the liquid 22.

  In the bubble generator 13, first to third inflating portions 33, 34, and 41 are formed so that the cross-sectional area gradually increases. In this case, shock waves and resonance are continuously generated in the liquid 22 in the first to third inflating portions 33, 34, and 41. Thereby, the bubbles generated in the liquid 22 in the liquid acceleration unit 32 can be further refined.

  As a result, there is no need to separately provide a device for sending air into the liquid accelerating unit 32, so that fine bubbles can be generated efficiently at low cost.

  Further, since air is sucked without generating a special flow (for example, a swirl flow) in the liquid 22 in the liquid accelerating unit 32, it is possible to prevent the generation of airflow sound.

  In addition, since air is sucked in the liquid accelerating unit 32 having a high negative pressure, the air can be sufficiently sucked even when the bubble generating device 10 is installed at a position where the water depth is deep.

  Moreover, in the bubble generator 13, the liquid 22 and air are flowing toward one direction. In this case, it is possible to prevent the bubble generator 13 from being clogged with foreign matter contained in the liquid 22. Thereby, the flow rate of the liquid 22 and the flow rate of air can be stabilized. As a result, fine bubbles can be generated stably.

  Further, the communication hole 42 and the liquid discharge port 43 have a circular cross section having a smaller diameter than the third inflating portion 41. In this case, the flow rate of the liquid 22 can be increased at the liquid discharge port 43, and the flow rate of the liquid 22 can be rapidly decreased when the liquid 22 is discharged into the storage tank 21. As a result, the bubbles in the liquid 22 can be further refined.

  In addition, when the bubble generating device 10 according to the present embodiment is used for raising seafood, the fine bubbles can be stably supplied without generating noise, so that the growth of the seafood is sufficiently promoted. be able to.

  Further, even under adverse conditions such as during transportation, fine bubbles containing oxygen can be stably supplied with high efficiency, so that the mortality rate can be reduced.

  Moreover, the active state of fish and shellfish can be maintained even at high and low water temperatures.

  In addition, when a surfactant is added to the liquid 22, fine bubbles can be generated more efficiently.

(2) 2nd Embodiment FIG. 3: is sectional drawing which shows the bubble generator 13 of the bubble generator which concerns on 2nd Embodiment. The bubble generator according to the present embodiment is different from the bubble generator according to the first embodiment in the following points.

  As shown in FIG. 3, in the present embodiment, a sphere 51 is provided in the third expansion portion 41. The spherical body 51 is fixed to the second bubble generating unit 40 by rod-like support members 52 and 53.

  In this case, the pressure and the flow velocity of the liquid 22 in the third inflating portion 41 are changed by the sphere 51. Thereby, a shock wave and resonance are generated in the liquid 22 in the third inflating portion 41. As a result, the bubbles can be further miniaturized more efficiently.

  Note that the sphere 51 may be provided in the first inflating portion 33 or the second inflating portion 34.

(3) Other Embodiments In the above embodiment, the case where the bubble generator 13 includes the first bubble generation unit 30 and the second bubble generation unit 40 has been described. The part 40 may not be provided. Also in this case, the air can be efficiently fed into the liquid accelerating unit 32 without separately providing a device for feeding the air into the liquid accelerating unit 32. In addition, shock waves and resonances are continuously generated in the liquid 22 in the first and second inflating portions 33 and 34. Thereby, bubbles generated in the liquid 22 in the liquid accelerating unit 32 can be efficiently miniaturized.

  Moreover, in the said embodiment, although the substantially conical liquid introduction part 31 is provided, you may provide the cylindrical liquid introduction part 31 which has a cross section of the same diameter as the opening part 31a. In this case, the flow rate of the liquid 22 flowing in the liquid acceleration unit 32 is higher than the flow rate of the liquid 22 flowing in the liquid supply hose 12 and the liquid introduction unit 31. In addition, the pressure of the liquid 22 in the liquid acceleration unit 32 is lower than the pressure of the liquid 22 in the liquid supply hose 12 and the liquid introduction unit 31. Therefore, the liquid accelerating unit 32 has a negative pressure, and air is efficiently sucked into the liquid accelerating unit 32 through the gas supply hose 14 and the gas flow path 35. Thereby, fine bubbles can be generated efficiently.

  One end of the liquid suction hose may be disposed in the storage tank 21. In this case, the liquid in the storage tank 21 can be circulated by the pump 11.

(4) Correspondence between each constituent element of claim and each part of the embodiment Hereinafter, an example of correspondence between each constituent element of the claim and each part of the embodiment will be described, but the present invention is limited to the following example. Not.

  In the above embodiment, the opening 31a corresponds to the inflow port, the opening on the other end side of the first bubble generation unit 30 or the liquid discharge port 43 corresponds to the outflow port, and the bubble generator 13 corresponds to the main body. The first expansion part 33 corresponds to the first cylindrical space, the second expansion part 34 corresponds to the second cylindrical space, and the third expansion part 41 corresponds to the third cylindrical space. The liquid supply hose 12 corresponds to the introduction pipe.

  The present invention can be effectively used for breeding aquatic organisms and purifying sewage.

It is a schematic diagram which shows the bubble generator which concerns on 1st Embodiment. It is sectional drawing of the bubble generator of FIG. It is sectional drawing which shows the bubble generator of the bubble generator which concerns on 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bubble generator 11 Pump 12 Liquid supply hose 13 Bubble generator 14 Gas supply hose 15 Liquid suction hose 21 Reservoir 22 Liquid 30 First bubble generation part 31 Liquid introduction part 31a Opening part 32 Liquid acceleration part 33 First expansion Part 34 Second expansion part 35 Gas flow path 40 Second bubble generation part 41 Third expansion part 42 Communication hole 43 Liquid discharge port

Claims (9)

A bubble generator for generating bubbles in a liquid,
A main body having an inlet through which liquid flows in and an outlet through which liquid flows out;
The main body has a liquid flow path communicating from the inlet to the outlet and a gas flow path for guiding gas to the liquid flow path,
The liquid flow path has a liquid introduction part, a liquid acceleration part, and an expansion part in order from the inlet to the outlet,
The liquid acceleration part has a smaller cross-sectional area than the expansion part in a direction perpendicular to the traveling direction of the liquid,
The cross-sectional area in the perpendicular direction of the liquid acceleration part and the expansion part is discontinuously expanded from the liquid acceleration part to the expansion part,
An end of the gas flow path communicates with the liquid acceleration unit. The bubble generating apparatus according to claim 1, wherein a cross-sectional area in the vertical direction of the liquid accelerating unit is smaller than an area of the inflow port. The bubble generating device according to claim 1, further comprising an introduction pipe for introducing a liquid to the inflow port, wherein a cross-sectional area in the vertical direction of the liquid accelerating unit is smaller than a cross-sectional area of the introduction pipe. . The angle between the liquid acceleration part and the gas flow path upstream of the merge part is less than 90 degrees in the merge part of the liquid acceleration part and the gas flow path. The bubble generator in any one of -3. The bubble generating device according to any one of claims 1 to 4, wherein a cross-sectional area of the expanding portion in the vertical direction increases stepwise toward the downstream side. The inflating portion includes a first cylindrical space having a first inner diameter, a second cylindrical space having a second inner diameter larger than the first inner diameter, and a second larger than the second inner diameter. The bubble generating device according to claim 1, further comprising a third cylindrical space having an inner diameter of three. The bubble generating device according to claim 1, wherein an area of the outlet is smaller than a cross-sectional area in the vertical direction of the downstream end of the expansion portion. The bubble generating apparatus according to claim 1, further comprising a sphere provided in the inflating portion. The bubble generating apparatus according to any one of claims 1 to 8, further comprising a pump for feeding liquid to the introduction pipe.

Images