JP2016034605A - Microbubble-mixed fluid generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently generate microbubble-mixed fluid by means of structure which is simple, small-sized and is excellent in maintainability.SOLUTION: A micro air bubble-mixed fluid generation device includes: a stationary side fluid shear members 15, 19 forming a plurality of stationary side fluid shear surfaces 15a, 19a which have different diameters and are superimposed in the radial direction and in the axial direction; a rotation side fluid shear member 27 which forms a plurality of movable side fluid shear surfaces 27a, 27b opposite to respective surfaces of the plurality of stationary side fluid shear surfaces 15a, 19a; a plurality of fluid shear spaces 31, 32 which are formed between respective shear surfaces 15a, 19a, 27a, 27b, have different diameters, are superimposed in the radial direction and in the axial direction and are successively communicated with each other; rugged fluid shear shapes of the respective shear surfaces; a rotationally driving member which rotationally drives the rotation side fluid shear member 27; a gas mixing part which mixes gas to fluid; a fluid inlet part 36 causing fluid to which gas is mixed to flow into the fluid shear spaces 31, 32 on an upstream side; and a fluid outlet part 37 which causes the fluid to flow out from the fluid shear spaces 31, 32 on a downstream side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a microbubble mixed fluid generating apparatus that stirs a fluid such as water mixed with a gas to make the mixed gas into microbubbles.

  Microbubbles called ultrafine bubbles, nanobubbles, etc. are extremely small bubbles with a diameter of 1 micron or less that cannot be seen with the naked eye. For example, water mixed with such microbubbles is less than normal water. High detergency, high oxygen content, easy chemical treatment and post-treatment, industrial products and food cleaning, wastewater treatment, beauty, aquaculture, hydroponics Widely used in fields.

  The microbubbles can be generated by physically stirring and shearing a fluid in which a gas is mixed in advance, and the conventional technology includes, for example, a microbubble generating device described in Patent Document 1.

  As shown in FIG. 2 and FIG. 3 of the same document, the microbubble generating device of Patent Document 1 is such that a rotor 42 is pivotally supported by a shaft 44a inside a cylinder 41 installed vertically, and the rotor 42 The outer circumferential surface 42a and the surface 43a of the stator 43 fixed to the inner side of the cylindrical body 41 are provided with rib-shaped irregularities extending in the axial direction, respectively. An inflow port 41 a through which fluid flows is provided near the upper end of the cylinder 41, and an outflow port 41 b through which fluid flows out is provided near the upper end of the cylinder 41. The rotor 42 is driven to rotate by a motor 44 installed on the upper portion of the cylinder 41.

  In this microbubble generating device, when the rotor 42 is rotationally driven by the motor 44 while a fluid such as water in which a gas such as hydrogen or air is premixed in a relatively large bubble shape is introduced from the inlet 41a, the outer circumference of the rotor 42 is increased. The irregular shapes formed on the surface 42a and the surface 43a of the stator 43 pass each other, so that the fluid is agitated and sheared, and the gas mixed in the fluid becomes microbubbles that cannot be seen, and a microbubble mixed fluid is generated. Is done. A fan 47 that promotes fluid flow in the cylinder 41 is provided below the rotor 42 so as to rotate integrally with the rotor 42.

Japanese Patent No. 5475273

  In the microbubble generating device of Patent Document 1, the capability (efficiency) of generating microbubbles can be increased as the area of the uneven fluid shear shape formed between the rotor 42 and the stator 43 is increased. However, for that purpose, the axial length and diameter of the rotor 42 and the stator 43 must be increased, which necessitates an increase in the size of the apparatus. Further, since the weight of the rotor 42 is increased and the rotational moment of inertia is increased, the motor 44 that rotationally drives the rotor 42 needs to have a large output, leading to an increase in power consumption and manufacturing cost.

  Furthermore, since the microbubble generating device of Patent Document 1 needs to support a solid and heavy rotor 42 at both ends, a shaft 44 a that supports the rotor 42 is supported at the upper end thereof by a support base for the motor 44. The lower end is pivotally supported by the floor member 46. For this reason, when attaching and detaching the rotor 42 and the stator 43 for maintenance and adjustment of the apparatus, the entire apparatus needs to be disassembled, and the maintainability is extremely poor.

  Further, in order to promote the flow of the fluid in the cylinder 41, additional components such as the fan 47 must be provided, and the structure is complicated.

  The present invention has been made in view of these circumstances, and provides a microbubble mixed fluid generating apparatus capable of efficiently generating a microbubble mixed fluid with a simple, small, and maintainable structure. With the goal.

In order to solve the above problems, the present invention employs the following means.
That is, the microbubble mixed fluid generating apparatus according to the present invention is a fixed-side fluid that is formed around a common central axis, has different diameters, and forms a plurality of fixed-side fluid shear surfaces that overlap in the radial direction and the axial direction. A shearing member, a rotation-side fluid shearing member pivotally supported around the central axis and forming a plurality of movable-side fluid shearing surfaces facing each of the plurality of stationary-side fluid shearing surfaces; and the plurality of fixings A plurality of fluid shearing spaces formed between the side fluid shearing surface and the plurality of movable side fluid shearing surfaces, having different diameters, overlapping in the radial direction and the axial direction and sequentially communicating with each other; In each of the spaces, an uneven fluid shear shape formed on at least one of the fixed-side fluid shear surface and the movable-side fluid shear surface, a rotation drive member that rotationally drives the rotation-side fluid shear member, and the fluid A fluid supply unit that supplies fluid to the cut space, a gas mixing unit that mixes gas with the fluid, and a fluid inlet unit that allows the fluid mixed with gas by the gas mixing unit to flow into the fluid shear space on the upstream side And a fluid outlet for allowing the fluid to flow out of the fluid shear space on the downstream side.

According to the microbubble mixed fluid generation device having the above-described configuration, a plurality of fluids are provided between the plurality of fixed-side fluid shearing surfaces of the fixed-side fluid shearing member and the plurality of movable-side fluid shearing surfaces of the rotation-side fluid shearing member. A shear space is formed overlapping in the radial direction and the axial direction.
A gas-liquid mixed fluid is generated by mixing the gas supplied from the fluid supply unit with the gas in the gas mixing unit, and this gas-liquid mixed fluid flows into the fluid shear space on the upstream side from the fluid inlet. And flows out from the fluid outlet provided in the fluid shear space on the downstream side.
During this time, the rotation-side fluid shearing member is rotationally driven by the rotation driving member, so that the fluid is sheared by the fluid shearing shape inside each fluid shearing space, and the gas mixed in the fluid becomes fine microbubbles. A microbubble mixed fluid is generated.

  In this microbubble mixed fluid generating device, as described above, since the plurality of fluid shearing spaces are formed overlapping in the radial direction and the axial direction, the axial lengths of the stationary fluid shearing member and the rotating fluid shearing member are the same. Without increasing the thickness and diameter, the area of the fluid shear shape of the fluid shear space can be increased, and the microbubble mixed fluid can be efficiently generated.

Moreover, since the movable fluid shearing surface is also formed inside the rotational fluid shearing member, the rotational fluid shearing member is hollow. For this reason, the weight of the rotation-side fluid shearing member can be reduced while increasing the total area of the movable-side fluid shearing surface.
As a result, the rotational moment of inertia of the rotation-side fluid shearing member can be greatly reduced, and the rotational driving member such as a motor for rotationally driving the rotational fluidic member can be reduced in size, and the manufacturing cost and power consumption can be reduced.

  In the microbubble mixed fluid generation device having the above-described configuration, the fluid inlet portion supplies the fluid from the rotation center portion of the rotation-side fluid shearing member to the fluid shearing space that is radially inward of the plurality of fluid shearing spaces. It is preferable that the fluid outlet portion is provided so as to allow the fluid to flow out from the fluid shearing space on the radially outer side.

  According to the above configuration, the fluid shear space on the radially inner side becomes the upstream side, and the fluid shear space on the radially outer side becomes the downstream side, and flows in from the fluid inlet portion provided at the rotation center portion of the rotation-side fluid shear member. The fluid flows from the fluid shear space on the radially inner side (upstream side) and flows out from the fluid shear space on the radially outer side (downstream side).

  During the rotation of the rotation-side fluid shear member, a larger centrifugal force is applied to the fluid shear space on the radially outer side (downstream side) than the fluid shear space on the radially inner side (upstream side). For this reason, the fluid that has flowed into the fluid shear space radially inward from the fluid inlet provided in the rotation center of the rotating side fluid shearing member is discharged from the fluid outlet by centrifugal force in the same manner as the action of the centrifugal pump. In order to supplement the fluid in the outer fluid shear space, the fluid flows from the radially inner side toward the outer fluid shear space. For this reason, the fluid always flows in from the fluid inlet portion and is discharged from the fluid outlet portion, and an additive such as a fan for promoting the circulation of the fluid becomes unnecessary. Therefore, the configuration of the microbubble mixed fluid generating device can be simplified.

  In the microbubble mixed fluid generating apparatus having the above-described configuration, it is preferable that the rotating-side fluid shearing member is pivotally supported in a cantilever shape and is detachable toward the free end in the axial direction.

  According to the above configuration, the rotation-side fluid cutoff member can be easily attached and detached, so that the maintainability of the microbubble mixed fluid generation device can be improved.

  In the microbubble mixed fluid generation device having the above-described configuration, the stationary fluid shearing member, the rotation fluid shearing member, and the rotation driving member are installed such that the central axis is vertically oriented, and the rotation driving member It is preferable that the fixed-side fluid shearing member and the rotation-side fluid shearing member are detachably installed on the top.

  According to the said structure, since the cylindrical rotation side fluid cutoff member standing upright is removed upwards, a rotation side fluid cutoff member can be attached or detached still more easily.

  When the rotation side fluid shearing member is pivotally supported in a cantilever manner as described above, at least one of the bearings that pivotally support the rotation side fluid shearing member is an axially intermediate portion of the rotation side fluid shearing member. It is preferable to arrange in the part.

  According to the above configuration, it is possible to reduce the amount of overhang from the bearing of the drive shaft of the rotating side fluid shearing member that is pivotally supported in a cantilevered manner. The microbubble mixed fluid can be efficiently generated by increasing the rigidity with respect to and rotating with high accuracy.

  As described above, according to the micro-bubble mixed fluid generating apparatus according to the present invention, the micro-bubble mixed fluid can be efficiently generated with a simple, small-sized, and maintainable structure.

It is an apparatus block diagram of the microbubble mixed fluid production | generation apparatus which concerns on this invention. It is a longitudinal cross-sectional view of the fluid shearing part which shows 1st Embodiment of this invention. FIG. 3 is a transverse sectional view taken along line III-III in FIG. 2. It is a longitudinal cross-sectional view of the fluid shearing part which shows 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the fluid shearing part which shows 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the fluid shearing part which shows 4th Embodiment of this invention.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an apparatus configuration diagram of a microbubble mixed fluid generating apparatus according to the present invention. This micro-bubble mixed fluid generating apparatus 1 mixes micro-bubbles of gas (exemplifies air in this embodiment) such as air, oxygen, carbon dioxide, and nitrogen into a fluid (exemplifies water in this embodiment). Thus, a microbubble mixed fluid is generated. When the fluid is water, super fine bubble water (nano bubble water) is generated.

  The microbubble mixed fluid generating apparatus 1 includes a box-shaped unit case 2, and the inside of the unit case 2 is partitioned into a motor chamber 4 and a pump chamber 5 with a partition wall 3 as a boundary. In the motor chamber 4, an inverter motor 6 (rotation drive member) is installed vertically with its main shaft 7 facing vertically upward, and the pump chamber 5 accommodates devices such as a pump 45 and an ejector 49 described later. ing. In addition, a cylindrical fluid shearing portion 8 is installed in the upper portion of the motor chamber 4. The fluid shearing portion 8 is configured as follows.

  First, as shown in FIG. 2, a partition plate 11 formed of a thick steel plate or the like that forms the top plate of the motor chamber 4 is fastened to the upper surface of the unit case 2 with a plurality of bolts 12, and passes through the partition plate 11. A cylindrical bearing holder 13 is fixed along the vertical direction. Further, an outer casing 15 (fixed-side fluid shearing member) having a cylindrical container shape larger in diameter than the bearing holder 13 and closed at the top is detachably fixed to the upper surface of the partition plate 11 with a plurality of bolts 16 ( (See also FIG. 1). A partition between the partition plate 11 and the outer casing 15 is liquid-tightly sealed with an O-ring 17.

  Further, as shown in FIG. 3, a cylindrical inner casing 19 (fixed-side fluid shearing member) is detachably fixed to the outer peripheral surface of the bearing holder 13. The main shaft 7, the bearing holder 13, the outer casing 15, the inner casing 19, and the inner rotor 27 described later are arranged in a straight line along a common vertical central axis C. As shown in FIGS. 2 and 3, the inner peripheral surface of the outer casing 15 is a fixed-side fluid shear surface 15a, and the outer peripheral surface of the inner casing 19 is a fixed-side fluid shear surface 19a. These fixed-side fluid shear surfaces 15a and 19a are formed around a common central axis C, have different diameters, and overlap in the radial direction and the axial direction. The fixed-side fluid shear surfaces 15a and 19a are uneven as will be described later.

  As shown in FIG. 2, a vertical drive shaft 23 is rotatably supported around a central axis C by a pair of upper and lower bearings 21 and 22 (bearings) press-fitted into both upper and lower ends of the bearing holder 13. Is connected to the main shaft 7 of the inverter motor 6 through a joint 24. A columnar inner rotor 27 (rotation-side fluid shearing member) covering the inner casing 19 is fixed to the upper portion of the drive shaft 23 by, for example, a plurality of bolts 28 so as to be detachable from the drive shaft 23. ing. That is, the inner rotor 27 is pivotally supported from below by the bearings 21 and 22 and the drive shaft 23, and if the outer casing 15 is removed, the bolt 28 is removed to remove the axially free end side ( Here, it can be removed toward the upper side).

  The inner rotor 27 is driven to rotate by the inverter motor 6 and rotates inside the outer casing 15. Here, of the bearings 21 and 22 that pivotally support the inner rotor 27, the upper bearing 22 is disposed at an intermediate portion in the axial direction of the inner rotor 27. That is, the bearing 22 is disposed at a height between the lower end portion 27 c and the upper end portion 27 d of the inner rotor 27. A mechanical seal 30 is provided on the bearing holder 13 to prevent the drive shaft 23 from coming off and waterproof.

  As shown in FIGS. 2 and 3, the outer peripheral surface of the inner rotor 27 is opposed to the movable fluid shear surface 27 a facing the fixed fluid shear surface 15 a of the outer casing 15 with an interval of, for example, 2 to 3 mm. It has become. Further, the inner peripheral surface of the inner rotor 27 is a movable fluid shear surface 27b that is opposed to the fixed fluid shear surface 19a of the inner casing 19 with an interval of, for example, 2 to 3 mm. The fluid shear spaces 31 and 32 are disposed between the stationary fluid shear surfaces 15a and 19a of the outer casing 15 and the inner casing 19 and the movable fluid shear surfaces 27a and 27b of the inner rotor 27 facing the outer casing 15 and the inner casing 19, respectively. Is formed. These fluid shear spaces 31 and 32 have different diameters, overlap in the radial direction and the axial direction, and communicate with each other. That is, the fluid shear space 32 has a diameter smaller than that of the fluid shear space 31 and overlaps with the inner peripheral side of the fluid shear space 31, and the communication space 33 is formed between the inner rotor 27 and the partition plate 11. Communicate.

In each of these fluid shear spaces 31 and 32, at least one of the fixed-side fluid shear surfaces 15a and 19a and the movable-side fluid shear surfaces 27a and 27b has an uneven fluid shear shape. For example, in the fluid shear space 31, both the fixed fluid shear surface 15a and the movable fluid shear surface 27a are provided with an uneven fluid shear shape so that the cross section perpendicular to the central axis C is a gear shape. (It is described in a simplified manner in FIG. 3).
Further, in the fluid shear space 32, the same uneven (gear-like) fluid shear shape is given to both the fixed-side fluid shear surface 19a and the movable-side fluid shear surface 27b. (In FIG. 3, the description is simplified)
The fixed-side fluid shearing surface 19 a has a large number of slit holes extending in the axial direction over the entire circumference of the cylindrical inner casing 19. By closely fitting, the cross-sectional shape at the position of the slit hole is formed into an uneven shape.

  As shown in FIGS. 1 and 2, a fluid inlet portion 36 is provided at the center of the upper surface of the outer casing 15, and a fluid outlet portion 37 is provided at the upper outer peripheral surface of the outer casing 15. The fluid inlet 36 flows water, which is mixed with gas such as air and oxygen by a pump 45 and an ejector 49, which will be described later, into the fluid shear space 32 on the upstream side in the radial direction from the center of rotation of the inner rotor 27. It is provided to let you. Further, the fluid outlet portion 37 is provided so as to allow water to flow out from the downstream fluid shear space 31 on the radially outer side.

  Specifically, the fluid inlet 36 is a tube fixed to the center of the upper surface of the outer casing 15 along the central axis C, for example, and is a shaft formed along the axis from the upper end of the drive shaft 23. It communicates with the heart inflow passage 40. Since the drive shaft 23 (axial inflow passage 40) rotates relative to the fluid inlet portion 36, the relative rotation between both members 36, 40 is possible between the fluid inlet portion 36 and the axial inflow passage 40. On the other hand, a seal member (not shown) that prevents water from flowing into the fluid shear space 31 on the downstream side from the fluid inlet 36 is interposed.

  As shown in FIG. 2, the drive shaft 23 is formed with a plurality of horizontal passages 41 extending horizontally from the lower end portion of the axial inflow passage 40, and these horizontal passages 41 are respectively formed inside the inner rotor 27. The vertical passages 42 communicate with the fluid shear space 32. For this reason, the water flowing in from the fluid inlet 36 is supplied to the fluid shear space 32 via the axial inflow passage 40, the horizontal passage 41 and the vertical passage 42.

On the other hand, the fluid outlet portion 37 has a pipe shape extending horizontally in a tangential direction with respect to the outer peripheral contour of the outer casing 15 in a plan view, and communicates with the uppermost portion of the fluid shear space 31 as shown in FIG. ing. As the inner rotor 27 rotates, water in the downstream fluid shear space 31 flows out from the fluid outlet portion 37.
The fluid shearing portion 8 is configured as described above.

As shown in FIG. 1, a pump 45 (fluid supply unit) is installed in the pump chamber 5 of the unit case 2, and a water supply pipe 46 for supplying water from the outside is connected to the suction port 45 a of the pump 45. Has been. The water supply pipe 46 is provided with a check valve 47.
On the other hand, a gas mixing pipe 48 is connected to the discharge port 45 b of the pump 45, and an ejector 49 (gas mixing part) is connected to an intermediate part of the gas mixing pipe 48. A pressure gauge 50 for measuring the discharge pressure of water at the discharge port 45b is provided.

  Further, a gas-liquid mixing pipe 52 is connected to the downstream side of the ejector 49 via a check valve 51, and a relief pipe 53 branched from between the ejector 49 and the discharge port 45b is a flow-regulated (manual) relief valve. The water supply pipe 46 is joined via 54.

  A gas supply pipe 55a using a pressure-resistant tube is connected to the ejector 49 via a check valve (not shown). The other end of the gas supply pipe 55 a is connected to one end of a gas flow meter 56 provided on the outer surface of the unit case 2, and the gas supply pipe 55 b connected to the other end of the gas flow meter 56 is also connected to the unit case 2. Is connected to a gas supply port 57 provided on the outer surface. The gas flow meter 56 is provided with a flow rate adjusting knob 56a. The gas supply port 57 is connected to a compressor and an air tank (not shown) that supply air. In addition, when using gas other than air, the cylinder, the gas generator, etc. with which the gas was compression-filled are connected.

The gas-liquid mixing tube 52 projects from the unit case 2 from the pump 45, and the tip thereof is connected to the fluid inlet 36 of the fluid shearing section 8 (outer casing 15).
A discharge pipe 58 is connected to the fluid outlet 37 of the fluid shearing section 8. An air vent valve 59 and a flow meter 60 capable of visually confirming the flow rate are connected to an intermediate portion of the discharge pipe 58. The air vent valve 59 is installed at a height equal to or higher than that of the fluid outlet portion 37.

The microbubble mixed fluid generating apparatus 1 configured as described above operates as follows.
That is, the pump 45 is operated while supplying water from the water supply pipe 46 shown in FIG. 1 to the suction port 45a of the pump 45. Thereby, the water discharged from the discharge port 45 b of the pump 45 flows through the gas mixing pipe 48. At this time, while viewing the pressure gauge 50, the opening degree of the relief valve 54 is adjusted so that a predetermined pump pressure is obtained.

  Further, while looking at the gas flow meter 56, the opening degree of the flow rate adjusting knob 56a is adjusted so that a predetermined air flow rate is obtained. Thereby, the air supplied from the gas supply port 57 is supplied to the ejector 49 through the gas supply pipe 55b, the gas flow meter 56, the gas supply pipe 55a, and the check valve (not shown), and the gas is mixed from the ejector 49. Mixed with the water flowing through the pipe 48, gas-liquid mixed water is generated. The gas-liquid mixed water is supplied to the gas-liquid mixing pipe 52 through the check valve 51 and supplied to the fluid inlet 36 of the fluid shearing unit 8.

  The gas-liquid mixed water supplied to the fluid inlet portion 36 of the fluid shearing portion 8 is, as indicated by arrows in FIG. 2, the axial inflow passage 40 and the horizontal passage 41 of the drive shaft 23, and the vertical passage of the inner rotor 27. 42 and the fluid shear space 32. In the fluid shearing space 32, the gas-liquid mixed water flows downward from above, while the concave and convex fixed side fluid shearing surface 19 a of the inner casing 19 that is fixed and the concave and convex movable side of the rotating inner rotor 27. The gas is stirred and sheared with the fluid shearing surface 27b, and the gas contained in the gas-liquid mixed water is subdivided into fine bubbles.

  Next, the gas-liquid mixed water containing fine bubbles flows from the fluid shear space 32 to the fluid shear space 31 via the communication path 33, and flows through the fluid shear space 31 from the lower side to the upper side while being fixed. Stirring and shearing more intensely between the uneven fixed side fluid shear surface 15a of the casing 15 and the uneven movable side fluid shear surface 27a of the rotating inner rotor 27 is included in the gas-liquid mixed water. Gas is subdivided into finer bubbles. Thus, the gas-liquid mixed water becomes microbubble mixed water (microbubble mixed fluid), is discharged through the fluid outlet 37 and the discharge pipe 58, and is supplied to the demand section. The discharge amount of the microbubble mixed water can be confirmed by the flow meter 60 connected to the discharge pipe 58.

  The microbubble mixed fluid generating apparatus 1 configured as described above includes, in the fluid shearing portion 8, two uneven fixed-side fluid shearing surfaces 15a and 19a of the outer casing 15 and the inner casing 19, and an inner rotor 27. Two fluid shear spaces 31 and 32 are formed overlapping in the radial direction and the axial direction between the two concave and convex movable fluid shear surfaces 27a and 27b. For this reason, without increasing the axial length and diameter of the outer casing 15 and the inner rotor 27, the fluid shearing shapes (the fixed-side fluid shearing surfaces 15a and 19a and the movable-side fluid shearing) of the fluid shearing spaces 31 and 32 are provided. A large area of the surfaces 27a and 27b) is ensured, and the microbubble mixed water can be efficiently generated by this wide fluid shearing shape.

Moreover, since the movable fluid shearing surface 27b is also formed inside the inner rotor 27, the inner rotor 27 is hollow. For this reason, it is possible to reduce the weight of the inner rotor 27 while increasing the total area of the movable fluid shear surfaces 27a and 27b.
Thereby, the rotational moment of inertia of the inner rotor 27 can be greatly reduced, and the inverter motor 6 for rotationally driving the inner rotor 27 can be reduced in size, and the manufacturing cost and power consumption can be reduced.

  A fluid inlet 36 for supplying gas / liquid mixed water to the fluid shearing section 8 is provided so as to supply gas / liquid mixed water from the center of rotation of the inner rotor 27 to the fluid shearing space 32 radially inward. . On the other hand, the fluid outlet portion 37 is provided so as to allow gas-liquid mixed water (microbubble mixed water) to flow out from the fluid shearing space 31 on the radially outer side. For this reason, the gas-liquid mixed water that has flowed into the fluid shearing portion 8 from the fluid inlet portion 36 easily flows from the fluid shearing space 32 to the fluid shearing space 31.

That is, since the fluid shear space 32 on the radially inner side becomes the upstream side and the fluid shear space 31 on the radially outer side becomes the downstream side, when the inner rotor 27 rotates, the fluid shear space on the radially inner side (upstream side). A large centrifugal force is applied to the fluid shear space 31 on the radially outer side (downstream side) than 32.
For this reason, the fluid that has flowed into the fluid shear space 32 on the radially inner side from the fluid inlet portion 36 provided at the rotation center portion of the inner rotor 27 is discharged from the fluid outlet portion 37 by centrifugal force, similarly to the action of the centrifugal pump. In order to supplement the fluid in the radially outer fluid shear space 31, the fluid flows from the radially inner fluid shear space 32 toward the radially outer fluid shear space 31.
Accordingly, the fluid always flows in from the fluid inlet portion 36 and is discharged from the fluid outlet portion 37. Therefore, it is not necessary to provide an additive such as a fan for promoting the flow of the gas-liquid mixed water inside the fluid shearing section 8, and the configuration of the microbubble mixed fluid generating apparatus 1 can be simplified.

  Further, in the microbubble mixed fluid generating apparatus 1, the inner rotor 27 is pivotally supported in a cantilevered manner, and the inner rotor 27 is detachable toward the free end side in the axial direction. For this reason, the inner rotor 27 can be easily attached and detached, and thereby the maintainability of the microbubble mixed fluid generating apparatus 1 can be improved.

  Further, the microbubble mixed fluid generating apparatus 1 includes an outer casing 15 and an inner casing 19 that are fixed-side fluid shear members, an inner rotor 27 that is a rotation-side fluid shear member, and an inverter motor 6 having a central axis C Are installed so that the outer casing 15, the inner casing 19, and the inner rotor 27 are detachably mounted on the inverter motor 6.

  As described above, the fluid shearing portion 8 (the outer casing 15, the inner rotor 27, etc.) is arranged in the microbubble mixed fluid generating device 1 in a vertically standing posture, and the drive shaft 23 of the inner rotor 27 is positioned downward. Since the outer casing 15 and the inner rotor 27 are removed upward, the outer casing 15 and the inner rotor 27 can be detached and attached very easily. Therefore, the maintainability of the microbubble mixed fluid generating apparatus 1 can be further improved.

  In addition, as shown in FIG. 2, the microbubble mixed fluid generating apparatus 1 includes one of two bearings 21 and 22 that pivotally support the inner rotor 27 (for example, the upper bearing 22). It is arrange | positioned in the axial direction intermediate part. For this reason, the amount of overhang from the bearing 22 of the drive shaft 23 of the inner rotor 27 supported in a cantilevered manner can be shortened, thereby increasing the rigidity against the deflection of the inner rotor 27 in the radial direction. It can be rotated with high accuracy and can contribute to the efficient generation of microbubble mixed water.

[Second Embodiment]
FIG. 4 is a longitudinal sectional view of a fluid shearing portion showing a second embodiment of the present invention.
Similar to the fluid shearing unit 8 of the first embodiment, the fluid shearing unit 61 includes a fixed outer casing 62 (fixed-side fluid shearing member) and an inner rotor 64 (rotation-side fluid shearing) that is rotationally driven by the drive shaft 63. Member).

  The outer casing 62 and the inner rotor 64 are provided with a plurality of fixed-side fluid shearing members 62a and movable-side fluid shearing surfaces 64a that mesh with each other in close proximity, and the inner surfaces of these shearing members 62a and 64a are arranged in the first embodiment. A gear-like fluid shearing shape (not shown) having a similar shape in plan view is provided. In addition, a fluid inlet 65 is provided at the center of the fluid shearing portion 61 and a fluid outlet 66 is provided at the outer periphery.

  When the inner rotor 64 is rotated while supplying gas-liquid mixed water from the fluid inlet 65, gas-liquid mixing is performed between the fixed stationary fluid shearing member 62a and the rotating movable fluid shearing surface 64a. The fluid is agitated and sheared, the gas contained in the gas-liquid mixed water is subdivided into fine bubbles, and the gas-liquid mixed water becomes microbubble mixed water (microbubble mixed fluid), which is discharged from the fluid outlet 66. The

  According to the fluid shearing portion 61, the surface areas of the fixed-side fluid shearing members 62a and the movable-side fluid shearing surface 64a that are provided in multiple can be increased, and therefore more efficiently than the fluid shearing portion 8 of the first embodiment. Microbubble mixed water can be generated.

[Third Embodiment]
FIG. 5 is a longitudinal sectional view of a fluid shearing part showing a third embodiment of the present invention.
In this fluid shearing portion 71, two fluid shearing portions 61 in the second embodiment (see FIG. 4) are vertically stacked, and the respective inner rotors 64 are rotationally driven by a common drive shaft 72. The gas-liquid mixed water flows in from the fluid inlet 73 provided at the center of the upper fluid shearing portion 61 and is discharged from the fluid outlet 74 provided at the outer peripheral portion of the lower fluid shearing portion 61. According to the fluid shearing unit 71, the microbubble mixed water can be generated more efficiently than the configuration of the second embodiment. In particular, since the microbubble mixed water generated in the upper fluid shearing section 61 is passed through the lower fluid shearing section 61 and stirred and sheared again, the bubble concentration of the microbubble mixing water is increased. can do.

[Fourth Embodiment]
FIG. 6 is a longitudinal sectional view of a fluid shearing part showing a fourth embodiment of the present invention.
The fluid shearing portion 81 has substantially the same configuration as the fluid shearing portion 71 in the above-described third embodiment (see FIG. 5). However, in the third embodiment, the upper and lower fluid shearing portions 61 communicate with each other, whereas in the fourth embodiment, the upper and lower fluid shearing portions 61 are independent, and each fluid shearing portion 61 has a fluid inlet portion. The gas-liquid mixed water is individually supplied from 73 and the micro-bubble mixed water generated in each fluid shearing portion 61 is individually discharged from the fluid outlet portion 74 provided in each fluid shearing portion 61. It has become.

  According to this configuration, although the bubble concentration of the generated fine bubble mixed water is lower than that of the fluid shearing unit 71 in the third embodiment, the amount of generated fine bubble mixed water can be increased.

  As described above, according to the micro-bubble mixed fluid generating apparatus according to the present embodiment, the micro-bubble mixed water can be efficiently generated with a simple, small, and maintainable structure.

  It should be noted that the present invention is not limited to the configuration of the above-described embodiment, and can be appropriately modified or improved within a scope not departing from the gist of the present invention. Are also included in the scope of rights of the present invention.

  For example, in each of the above embodiments, an example in which water is used as a fluid and air is used as a gas has been described. However, other types of fluids and gases may be used.

1 Microbubble mixed fluid generator 6 Inverter motor (rotary drive member)
7 Main shaft of inverter motor 8 Fluid shearing part 15 Outer casing (fixed-side fluid shearing member)
15a Fixed side fluid shearing surface 19 Inner casing (fixed side fluid shearing member)
19a Fixed-side fluid shear surface 21, 22 Bearing (bearing)
23 Drive shaft 27 Inner rotor (rotational fluid shear member)
27a, 27b Movable fluid shearing surfaces 31, 32 Fluid shearing space 36 Fluid inlet portion 37 Fluid outlet portion 45 Pump (fluid supply portion)
49 Ejector (Gas supply part)
C Center axis

Claims (5)

A stationary fluid shearing member formed around a common central axis and having different diameters and forming a plurality of stationary fluid shearing surfaces overlapping in the radial and axial directions;
A rotation-side fluid shearing member that is rotatably supported around the central axis and forms a plurality of movable-side fluid shearing surfaces facing each of the plurality of fixed-side fluid shearing surfaces;
A plurality of fluid shear spaces formed between the plurality of fixed-side fluid shear surfaces and the plurality of movable-side fluid shear surfaces, having different diameters, overlapping in the radial direction and the axial direction and sequentially communicating with each other;
In each of the plurality of fluid shear spaces, an uneven fluid shear shape formed on at least one of the fixed-side fluid shear surface and the movable-side fluid shear surface;
A rotational drive member for rotationally driving the rotational fluid shear member;
A fluid supply for supplying fluid to the fluid shear space;
A gas mixing section for mixing a gas with the fluid;
A fluid inlet for allowing the fluid mixed with the gas to flow into the fluid shear space on the upstream side;
And a fluid outlet portion for allowing the fluid to flow out from the fluid shear space on the downstream side.   The fluid inlet portion is provided so as to supply the fluid from the rotation center portion of the rotation-side fluid shear member to the fluid shear space that is radially inward of the plurality of fluid shear spaces, and the fluid outlet portion is The microbubble mixed fluid generating device according to claim 1, wherein the fluid is provided so as to flow out from the fluid shear space located radially outside.   3. The microbubble mixed fluid generating device according to claim 1, wherein the rotation-side fluid shearing member is pivotally supported in a cantilever shape and is detachable toward a free end in the axial direction thereof.   The fixed-side fluid shear member, the rotation-side fluid shear member, and the rotation drive member are installed such that the central axis is in a vertical direction, and the fixed-side fluid shear member and the rotation drive member are placed on the rotation drive member. 4. The microbubble mixed fluid generating device according to claim 3, wherein the rotating side fluid shearing member is detachably installed.   5. The microbubble mixed fluid generation according to claim 3, wherein at least one of the bearings that pivotally support the rotation-side fluid shearing member is disposed at an intermediate portion in the axial direction of the rotation-side fluid shearing member. apparatus.

Images