JP3620797B2 - Microbubble generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus and system for generating a gas-liquid mixture by dissolving a gas in a liquid and generating ultrafine bubbles.
[0002]
[Prior art]
Patent Document 1 discloses a configuration in which air is dissolved in bathtub water taken out by a gas-liquid mixing tank and then returned to the bathtub.
In Patent Document 2, a pump for introducing a gas into a liquid introduction pipe to generate a gas-liquid mixture and a stationary mixer on the downstream side of the pump are provided, and the gas-liquid mixture generated by the pump is stirred and mixed. Thus, a bubble generating apparatus that generates ultrafine bubbles is disclosed.
[0003]
[Patent Document 1]
JP 2001-179241 A [Patent Document 2]
Japanese Patent Laid-Open No. 2002-85949
[Problems to be solved by the invention]
The present applicant has also developed a technique for generating finer bubbles by compressing air with a compressor and mixing it with a liquid.
However, the above-mentioned fine bubble generating device has a large volume of the entire device and a high noise level, and has left a problem in installing in a closed space, particularly a narrow space such as a bathroom.
[0005]
Therefore, the present invention provides a device that can be downsized to such an extent that it can be installed in a narrow space such as a bathroom and that stably generates finer bubbles continuously.
[0006]
[Means for Solving the Problems]
Fine bubble generating device of the present invention comprises a vortex pump for dissolving gas in a liquid fluid and the gas to be subjected feed mixture and stirring to, mixed and dissolved further gas a gas mixture and dissolving liquid discharged from the vortex flow pump a gas-liquid mixing means for separating a gas that is not dissolved is contained causes the discharge gas dissolved solution discharged from the gas-liquid mixture separating means and depressurizing to a discharge means for generating fine bubbles, discharging means And a discharge pipe that communicates with the gas-liquid mixing and separation means, and a discharge pipe cover that houses the distal end portion of the discharge pipe, and the discharge pipe has a plurality of pressurizing means disposed through the mesh body at the distal end portion thereof. The discharge pipe cover is attached so as to cover the discharge port of the mixed liquid in the discharge pipe, and the gas-liquid mixed liquid is discharged from the discharge pipe into the cover, and an ejection hole is formed in the cover wall surface.
The liquid in which gas is dissolved by the gas-liquid mixing / separating means repeatedly pressurizes and depressurizes a plurality of times at the tip of the discharge pipe to generate fine bubbles in the gas solution, and further, the gas-liquid mixture discharged into the cover The liquid bubbles collide with the wall surface in the cover and are further micronized by swirling flow / turbulent flow, and discharged from the ejection holes of the ejection surface .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a microbubble generator according to the present invention will be described with reference to the drawings.
FIG. 1 shows an example in which a fine bubble generator according to the present invention is applied to an apparatus for generating fine bubbles by mixing and dissolving a gas in pumped-up bathtub water and refluxing it in the bathtub.
The fine bubble generating apparatus 10 mixes and stirs gas in a liquid by a vortex pump 13 housed in the housing 11 and separates the gas that is not dissolved by the gas-liquid mixing / separation device 17. It is configured to generate ultrafine bubbles. That is, the gas (air) is mixed and dissolved in the liquid (water) in the bathtub 100 supplied from the supply pipe 1 connected to the bathtub 100, and is returned to the bathtub through the discharge pipe 7. Is generated.
[0009]
The casing 11 of the microbubble generator 10 is sealed, and the supply pipe 1 and the discharge pipe 7 and the casing are in a confidential state by a sealing mechanism, and are provided with a waterproof / soundproof mechanism.
In the housing 11, a vortex pump 13 driven by an electric motor 14, a gas-liquid mixing / separating device 17, and the like are connected by hot water feeding pipes 2 and 5. The hot water feed pipe 2 is connected to the supply pipe 1 to guide the water pumped from the bathtub 100 to the vortex pump 13, and the hot water feed pipe 5 sends the gas mixture / dissolved liquid discharged from the vortex pump 13 to the gas-liquid mixing separator 17. Lead.
[0010]
The vortex pump 13 is connected to a hot water feed pipe 2 and an air supply pipe 4 that supplies air to the vortex pump 13 through an intake air adjustment valve 15. Then, the air whose air amount is adjusted by the intake air adjusting valve 15 is directly supplied. The air supply pipe 4 communicates with the air suction portion 16, and a water backflow prevention valve 19 is disposed between the intake air adjustment valve 15 and the air suction portion 16. The intake air adjustment valve 15 adjusts the amount of air sucked into the vortex pump 13 by adjusting the valve so that the discharge pressure of the air solution discharged from the discharge pipe 7 to the bathtub becomes 3.5 to 4 atm. ing.
[0011]
The hot water feed pipe 2 that connects the bathtub 100 and the vortex pump 13 has a bellows portion 3 that has a bellows-shaped pipe surface and a large surface area on the upstream side of the inlet to the vortex pump 13. A hot water feed pipe 5 to the gas-liquid mixing / separating device 17 is connected to the downstream side of the vortex pump 13 and opens to the gas-liquid mixing / separating device 17. The hot water feed pipe 5 that connects the vortex pump 13 and the gas-liquid mixing / separating device 17 has a bellows portion 6 that has a bellows-shaped pipe surface and a large surface area on the upstream side of the gas-liquid mixing / separating device 17.
The gas-liquid mixer / separator 17 is provided with a communication port to the air discharge valve 18 in the upper part, and a discharge pipe 7 to the bathtub is connected to the downstream side.
[0012]
A case 170 for accommodating ceramic particles is disposed in the gas-liquid mixing separator 17. The case 170 is filled with ceramic grains 175, and the ceramic grains 175 are, for example, granules having a diameter of about 120 mm. The upper portion of the case 170 communicates with the hot water feeding pipe 5, and the lower end of the case 170 is connected to the discharge pipe 7.
The discharge pipe 7 communicates with the discharge unit 20 that opens in the bathtub 100.
[0013]
The discharge unit 20 includes a discharge pipe 21 and a discharge cover 23 that houses the discharge pipe 21.
The discharge pipe 21 is provided with a pressurizing means at the tip. The pressurizing means includes a first orifice 210 and a second orifice 212. Two mesh bodies 213 are stretched between the first orifice 210 and the second orifice 212. Further, three mesh bodies 217 are stretched at the tip of the second orifice 212.
The discharge cover 23 covers the discharge pipe 21 and forms an ejection surface 230 parallel to the water discharge direction. The ejection surface 230 is configured to perforate ejection holes 231 on the entire surface or a part thereof.
[0014]
FIG. 2 shows a housing internal mechanism of the microbubble generator 10.
The casing 11 is made of a thin metal plate having a high thermal conductivity and has good heat dissipation efficiency, and has a sealed structure. The electric motor 14 that drives the vortex pump 13 rotates the stirring propeller of the vortex pump 13 by about 3000 revolutions with a capacity of about 500 W. The electric motor 14 is installed on the bottom plate 110 of the housing 11 via an anti-vibration rubber 141 or the like. The vortex pump 13 connected to the hot water feed pipe 2 connected to the bathtub 100 is rotatably provided with a stirring propeller (not shown), and the air supply pipe 4 is connected to the upper part. The air supply pipe 4 is connected to a pump priming water inlet 41 and a water backflow prevention valve 19 disposed on the ceiling plate 112 of the housing 11. When the pump priming water injection port 41 injects priming water from the pump priming water injection port 41 when the apparatus 10 is started, the suction of water from the bathtub is started smoothly. The water backflow prevention valve 19 adjusts the internal pressure by opening the valve so that the water in the pump does not flow into the air supply pipe 4 when the apparatus 10 is stopped. The intake air adjusting valve 15 adjusts the inflow amount of air from the air supply pipe 4 to the vortex pump 13 so that the discharge pressure of water from a discharge portion (nozzle) to be described later becomes 3.5 to 4 atm.
[0015]
The gas-liquid mixing separator 17 connects the hot water feed pipe 5 to the upper part, and connects the discharge pipe 7 to the lower part. An air vent valve 18 is connected to the ceiling of the gas-liquid mixing separator 17. And the excess bubble contained in the air solution which flows into the gas-liquid mixing separator 17 accumulates in the upper part of the gas-liquid mixing separator 17, and when it becomes constant pressure, the air vent valve 18 opens and discharges air. ing.
The gas-liquid mixing / separating device 17 is provided with a case 170 filled with ceramic particles 175, water from the hot water feeding pipe 5 flows into the case 170, flows down between the ceramic particles 175, and is discharged from the discharge pipe 7. It becomes the structure discharged in the bathtub 100 via a discharge part.
[0016]
The operation of the fine bubble generating apparatus 10 configured as described above will be described.
Before starting, a small amount of water is injected into the vortex pump 13 from the priming water inlet 41. Next, the switch 9 is turned on to activate the electric motor 14 and the vortex pump 13. Water in the bathtub 100 is smoothly sucked from the suction pipe 1. Further, due to the negative pressure generated when the vortex pump 13 is started, the intake air adjustment valve 15 is opened and air is taken into the vortex pump 13. Since the intake air adjustment valve 15 is adjusted so that the discharge pressure becomes predetermined, an appropriate amount of air flows into the vortex pump 13.
[0017]
Water from the bathtub 100 flows into the vortex pump 13 through the hot water feed pipe 2. And heat exchange is carried out while passing the bellows part 3 with a large surface area. That is, the temperature in the housing 11 rises due to the operation of the electric motor 14, but this heat is heat-exchanged by water passing through the bellows portion 3 and the bellows portion 6, so that the temperature in the housing is kept almost constant. For example, when the water from the bathtub is 40 ° C., the water absorbs heat from the electric motor 14 and keeps the room temperature in the housing 11 at about 50 ° C.
[0018]
The water that has flowed into the vortex pump 13 from the hot water feed pipe 2 is mixed with the air that flows from the air supply pipe 4 and stirred by an impeller of about 3000 rotations, and the air and water become a gas-liquid mixture containing bubbles. At this time, a filter is installed at the air inlet 16 of the air supply pipe 4 to remove dust and dust contained in the sucked air and to purify it. In addition, when the apparatus 10 is stopped, when the motor 14 stops and the rotation of the pump 13 stops, the water backflow prevention valve 19 may cause water to flow back into the air supply pipe 4 when the water level in the pump 13 is high. . At this time, the water backflow prevention valve 19 seals the passage to prevent water backflow. The water that has been mixed and stirred in the vortex pump 13 to mix the gas and liquid and further dissolves the air flows into the gas-liquid mixing separator 17 from the hot water feed pipe 5.
[0019]
The water pressure inside the gas-liquid mixing / separating device 17 is adjusted to about 3.5 to 4.0 kg / cm ² . The high-pressure water that flows in falls inside the gas-liquid mixing separator 17. At this time, the air-mixing / air-dissolving solution collides with the ceramic particles 175 in the ceramic case 170 and is further mixed and stirred. Further, the water collides with the wall surface of the case 170 and becomes a swirling flow or a turbulent flow in the case 170. The water and air increase the mixing efficiency, and the gas is dissolved in water to the limit and efficiently becomes a saturated solution. The time required for dissolution in the gas-liquid mixing / separation unit 17 by collision with ceramic particles, swirling flow, and turbulent flow is about 4 to 6 seconds, during which time the air is dissolved to the limit.
[0020]
In addition, the air that is contained in the inflowing water but does not dissolve and becomes the bubbles 30 floats above the gas-liquid mixing separator 17. And when it accumulates on the upper part of the container and becomes a certain amount, the air discharge valve 18 is pushed up and discharged out of the machine from the air discharge pipe 8. The air exhaust pipe 8 is provided with a discharge air silencer 81 to prevent the operating sound of the valve 18 from leaking out of the machine.
[0021]
The discharge pipe 7 is connected to a discharge part 20 that opens into the bathtub 100.
The solution flowing from the discharge pipe 7 into the discharge section 20 is pressurized when passing through the passage hole 25 of the first orifice 210 of the discharge pipe 21, and when discharged from the passage hole 25, the solution is decompressed to remove fine bubbles. Occur. Further, when passing through the two mesh bodies 213, the fine bubbles are further refined. Then, when passing through the passage hole 26 of the second two orifices 212, the pressure is increased, and when discharged from the passage hole 26, the pressure is reduced to generate fine bubbles. Further, when passing through the three mesh bodies 217, the fine bubbles are further refined and discharged into the discharge pipe cover 23. In the discharge pipe cover 23, water becomes fine bubbles due to collision, swirl flow, and turbulent flow on the cover wall surface, and is discharged into the bathtub 100 from the ejection holes 231 drilled in the ejection surface 230. The discharge pressure at this time is about 3.5 to 4 atmospheres.
[0022]
Further, a water leak detector (safety device) 50 may be disposed in the housing 11.
In the example shown in the drawing, the water leakage detector 50 is installed on the bottom plate 141 of the device 10 below the vortex pump 13.
The water leakage detector 50 includes an operating shaft 53 that operates by movement of the float 55, an operating shaft holding portion 52 that engages and holds the operating shaft 53, and a trigger 54 that restricts rotation of the operating shaft holding portion 52.
The trigger 54 can rotate around the rotation shaft 540. A float support rod 51 to which a float 55 is attached is attached to the trigger 54.
And when the inside of the housing | casing 11 of the microbubble generator 10 has a water leak by some malfunction, the water which accumulated on the baseplate 110 pushes up the float 55. FIG. As the float 55 moves, the trigger 51 rotates about the rotation shaft 540 as a rotation axis. The operating shaft holding part 52 regulated by the trigger 51 is rotated and disengaged from the operating shaft 53. The operating shaft 53 rises and presses the switch 60 to cut the breaker.
[0023]
In this way, even if water leaks from the hot water supply pipe or pump, the breaker is dropped by the water leak detector (safety device) 50 and the device can be stopped, so there is a risk of overheating due to overcurrent. There is no.
[0024]
Since the fine bubble generating apparatus 10 described above does not include devices such as a compressor and a mixing machine, the generator can be small. The vertical width W = 46 cm, the horizontal width = 22 cm, and the height H = The size can be reduced to 37 cm. Moreover, even if the miniaturized microbubble generator 10 is installed in a narrow space such as a bathroom, it does not get in the way. In addition, the noise level is low because a device with high power consumption such as a compressor is not used.
[0025]
Furthermore, the adjustment of the discharge pressure of the gas solution is determined by the amount of air supplied to the vortex pump, but this adjustment can be made by adjusting the intake air adjustment valve 15 and the adjustment of the discharge pressure becomes simple. Since the discharge pressure is constant, bubbles having an average of about 2 μm can be stably generated.
[0026]
【The invention's effect】
As described above, the present invention can achieve downsizing so that the apparatus can be installed in a narrow space such as a bathroom. In addition, since a plurality of gas-liquid mixing and agitation mechanisms are disposed in the liquid flow path, finer bubbles can be generated stably and continuously.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a configuration of a fine bubble generating device. FIG. 2 is an explanatory diagram of a configuration of a fine bubble generating device in a casing. FIG. 3 is an explanatory diagram of a configuration of a discharge unit. Explanation of]
DESCRIPTION OF SYMBOLS 1 Supply pipe 2, 5 Hot water supply pipe 3, 6 Bellows part 7 Discharge pipe 10 Fine bubble generator 11 Case 13 Eddy current pump 14 Generator 15 Adjustment valve 17 Gas-liquid mixing separator 170 Case 175 Ceramics particle 20 Discharge part 21 Discharge Pipes 210 and 212 Orifice 213 and 215 Mesh body 23 Cover 30 Air bubble 50 Water leakage detector 55 Float 60 Switch 100 Bathtub

Claims (2)

The vortex pump that mixes and stirs the supplied liquid and gas to dissolve the gas in the liquid, and the gas mixture and solution discharged from the vortex pump further mixes and dissolves the gas and separates the undissolved gas that is contained Gas-liquid mixing / separating means, and discharging means for discharging / depressurizing the gas solution discharged from the gas-liquid mixing / separating means to generate fine bubbles,
The discharge means has a discharge pipe that communicates with the gas-liquid mixing and separation means, and a discharge pipe cover that houses the tip of the discharge pipe,
The discharge pipe is provided with a plurality of pressurizing means via a mesh body at the tip portion thereof,
The discharge pipe cover is attached so as to cover the discharge port of the liquid mixture of the discharge pipe, and the gas-liquid mixed liquid is discharged from the discharge pipe into the cover, and a discharge hole is formed on the wall surface of the discharge pipe.
The liquid in which gas is dissolved by the gas-liquid mixing / separating means is repeatedly pressurized and depressurized at the tip of the discharge pipe a plurality of times to generate fine bubbles in the gas solution, and further the gas-liquid discharged into the discharge pipe cover A device for generating fine bubbles in which bubbles of a mixed liquid collide with a wall surface of a discharge pipe cover, are further made into fine bubbles by swirling / turbulent flow, and are discharged from an ejection hole on the wall surface of the discharge pipe cover . 2. The fine bubble generating apparatus according to claim 1, wherein fine bubbles discharged from the discharge holes of the discharge pipe cover are bubbles having an average of about 2 [mu] m .

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