JP3680670B2 - Microbubble generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fine bubble generator that generates fine bubbles in a storage tank by taking out the liquid in the storage tank, dissolving air in the liquid, and returning the liquid to the storage tank. Examples of the storage tank include a bathtub, a pool, and a water tank such as a pond.
[0002]
[Prior art]
Conventionally, the fine bubble generating device has been used to remove suspended matters in water by the adhesion and floating action of fine bubbles, or to make bath water milky white with fine bubbles to enhance a feeling of bathing.
[0003]
FIG. 9 shows the configuration of a conventional fine bubble generator. In the figure, 80 is a fine bubble generator, and 90 is a bathtub. The microbubble generator 80 connects a circulation passage 81 to a bath water outlet 91 and a return port 92 provided in the bathtub 90, and a circulation pump 82 is disposed in the circulation passage 81. The venturi 83 is disposed upstream of the position of the circulation pump 82, and the ejection nozzle 84 is disposed at the connection portion with the return port 92 in the circulation passage 81.
[0004]
The venturi 83 is generally well-known, but the inside of the venturi 83 is brought into a negative pressure state along with the passage of bath water, and the outside air that is atmospheric pressure is sucked from the air introduction pipe 85. is there. The amount of air sucked by the venturi 83 is adjusted by the passage speed of the bathtub water and the opening degree of the motor-operated valve 86 provided at the end of the air introduction pipe 85.
[0005]
Here, the operation of the microbubble generator 80 will be described. That is, the bathtub water in the bathtub 90 is taken out by the circulation pump 82, external air is mixed into the bathtub water by the venturi 83, and the air is dissolved in the bathtub water by the pressurizing force of the circulation pump 82. The fine bubbles 100 are generated in the bathtub 90 by being ejected vigorously into the bathtub 90 through 84. That is, when the bathtub water mixed with air by the venturi 83 is pressurized by the circulation pump 82 to dissolve the air and then returned to the bathtub 90, the pressure applied to the bathtub water is blown in the bathtub 90 at once. The air dissolved in the bath water precipitates and becomes the fine bubbles 100.
[0006]
Here, when the floating substance 101 exists in the bathtub water in the bathtub 90, the floating substance 101 adheres to the fine bubbles 100 generated in the bathtub 90 as described above, and the surface of the bathtub water. Therefore, the water is discharged through the overflow drain port 93 and the drain pipe 94 provided in the bathtub 90.
[0007]
[Problems to be solved by the invention]
In the above conventional example, air is sucked into the bath water by the venturi 83 arranged upstream of the circulation pump 82, so that relatively large bubbles are easily mixed in the bath water, There is a concern that the circulation pump 82 is likely to be air-locked because there is a possibility that it will grow together and grow. For this reason, conventionally, it has been necessary to use an expensive pump excellent in air lock resistance as the circulation pump 82.
[0008]
In view of such circumstances, it is an object of the present invention to efficiently generate fine bubbles by enabling air to be efficiently dissolved in a liquid without using an expensive circulation pump in the fine bubble generator.
[0009]
[Means for Solving the Problems]
The first microbubble generator of the present invention is a device that takes out the liquid in the storage tank, dissolves air in this liquid, and then returns the liquid into the storage tank to generate microbubbles in the storage tank. A circulation passage connected to a liquid outlet and a return opening provided in the storage tank, a circulation pump disposed in the middle of the circulation passage to circulate the liquid in the storage tank so that the liquid is taken out and returned; It is inserted downstream of the circulation pump, connected to the circulation passage so that the liquid is introduced from the upper side and flows out from the lower side to the storage tank side, and the internal stored air is entrained in the liquid pressurized and introduced by the circulation pump. The gas-liquid mixing tank that is allowed to dissolve and then pass through while storing a part thereof, the injection nozzle provided in the liquid introduction part connected to the gas-liquid mixing tank, and the return port are connected to the gas-liquid mixing tank Liquid led And a jet nozzle which is set to a large hydraulic resistance than flow resistance of the injection nozzle provided in the section, it is characterized in that.
[0011]
The present invention second fine-bubble generating device, the first gas-liquid mixing tank above SL, porous member is provided which separates the internal space in the vertical, and characterized in that.
[0012]
Third fine-bubble generating device according to the present invention, the first gas-liquid mixing tank above SL, along with a partition plate is provided for partitioning the interior space into two liquid introduction side and the liquid outflow side, the partition A cylindrical body for receiving the liquid introduced on the surface of the liquid introduction side in the plate is provided, and further, the foreign material can flow out by communicating the two partitioned spaces with the outer peripheral area of the cylindrical body in the partition plate. It is characterized in that a through hole is provided.
[0013]
The fourth microbubble generator according to the present invention is characterized in that a water drainage part is provided in the third cylindrical body for allowing the liquid received therein to flow out to the through hole side when operation is stopped. Yes.
[0014]
In short, in the present invention, the gas-liquid mixing tank is arranged downstream of the circulation pump, and the liquid pressurized by the circulation pump is vigorously supplied into the gas-liquid mixing tank, and the internal stored air is entrained and dissolved. I have to. As a result, liquid containing bubbles does not flow into the circulation pump as in the prior art, so that it is not necessary to use an expensive circulation pump excellent in air lock resistance.
[0015]
In addition, when the fine bubble generating apparatus of the present invention is used, a large amount of fine bubbles can be generated at a low cost, so that purification can be performed efficiently and if the storage tank is a bathtub, bathing is performed. It is possible to enhance the feeling.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The details of the present invention will be described based on embodiments shown in the drawings.
[0017]
1 to 3 show Embodiment 1 of the present invention. 1 is a circuit diagram of a bathtub system, FIG. 2 is a longitudinal sectional view of a gas-liquid mixing tank in FIG. 1, and FIG. 3 is a longitudinal sectional view of the gas-liquid mixing tank during operation.
[0018]
In the figure, 10 is a bathtub and 20 is a fine bubble generator.
[0019]
The bathtub 10 is provided with a bath water outlet 11 and a return port 12, and an overflow drain port 13 is provided at a required height position on one side wall of the bathtub 10. A drain pipe 14 is connected to the overflow drain port 13, and an electric valve 15 is provided at an end of the drain pipe 14.
[0020]
The fine bubble generating device 20 generates the fine bubbles in the bathtub 10 by taking out the bathtub water in the bathtub 10 and dissolving the air in the bathtub water and then returning it to the bathtub 10. A passage 21, a circulation pump 22, a gas-liquid mixing tank 23, and a controller 24 are provided.
[0021]
The circulation passage 21 is connected to the take-out port 11 and the return port 12 of the bathtub 10 so that the bath water can be taken out from the bathtub 10 and returned. In the circulation passage 21, a jet nozzle 25 is attached to the return port 12 of the bathtub 10 to expel the bathtub water that has passed through the circulation passage 21 into the bathtub 10.
[0022]
The circulation pump 22 is disposed in the middle of the circulation passage 21 and circulates bathtub water between the bathtub 10 and the circulation passage 21.
[0023]
The gas-liquid mixing tank 23 is interposed downstream of the circulation pump 22 in the circulation passage 21. A part of the gas-liquid mixing tank 23 is stored after the internal stored air is brought into and dissolved in the bath water pressurized and introduced by the circulation pump 22. While passing.
[0024]
As shown in FIG. 2, the gas-liquid mixing tank 23 is connected to the circulation passage 21 so as to introduce bathtub water from the ceiling surface and to flow out bathtub water from the bottom surface to the bathtub 10 side. In addition, an injection nozzle 26 with a narrowed diameter is attached to the bathtub water introduction part connected to the gas-liquid mixing tank 23 in the circulation passage 21.
[0025]
An air valve 27 is provided on the ceiling surface of the gas-liquid mixing tank 23 so that the gas-liquid mixing tank 23 can be opened to the atmosphere. The air valve 27 is of a normally closed type, and is energized and opened when it is necessary to open the gas-liquid mixing tank 23 to the atmosphere.
[0026]
The controller 24 controls the operation of each component of the fine bubble generating device 20 and executes the following operation.
[0027]
In addition, the circulation pump 22 and the gas-liquid mixing tank 23 are installed in the position higher than the upper limit water level L (one-dot chain line) of the bathtub water in the bathtub 10. As will be described later, such installation is performed in order to facilitate the air introduction operation to the gas-liquid mixing tank 23.
[0028]
Further, the jet nozzle 25 connected to the bathtub 10 is set to have a water flow resistance larger than the water flow resistance of the spray nozzle 26 in the gas-liquid mixing tank 23. In addition to providing a pressure-reducing body having a diameter of the water passage smaller than that of the water passage of the injection nozzle 26, a baffle that provides water resistance may be provided. Thus, by setting the water flow resistance of the ejection nozzle 25 to be larger than the water flow resistance of the injection nozzle 26, the inside of the gas-liquid mixing tank 23 can be maintained in a pressurized state.
[0029]
Next, the operation of the fine bubble generator 20 will be described. That is, when an operation switch (not shown) is turned on, the circulation pump 22 is driven, and the bath water is drawn from the bathtub 10 into the circulation passage 21 and introduced into the gas-liquid mixing tank 23.
[0030]
At this time, the bath water is pressurized by the circulation pump 22 and vigorously introduced by the injection nozzle 26 with respect to the gas-liquid mixing tank 23. On the other hand, it is made to collide violently and entrains the stored air in the gas-liquid mixing tank 23. As the required time elapses, it flows out from the bottom of the gas-liquid mixing tank 23 to the circulation passage 21 side, but is gradually stored in the gas-liquid mixing tank 23 due to the balance between the amount of bath water introduced and the amount of outflow. become. When bathtub water is stored in this manner, this time, the bathtub water introduced from the injection nozzle 26 collides with the stored bathtub water, and the air in the gas-liquid mixing tank 23 is entrained. In this case, a large amount of air is dissolved in the stored bath water.
[0031]
In this way, a large amount of air is dissolved in the bathtub water in the gas-liquid mixing tank 23, but the bathtub water that has flowed out of the gas-liquid mixing tank 23 is jetted into the bathtub 10 from the jet nozzle 25. The pressure is reduced. When the bathtub water is returned to the bathtub 10 in this way, the pressure applied to the bathtub water is released at once in the bathtub 10, so that the dissolved air is precipitated in the bathtub water and a large number of fine bubbles 16 are deposited. Will occur.
[0032]
By the way, since the air in the gas-liquid mixing tank 23 is gradually dissolved in the bath water as the operation time elapses, the stored air in the gas-liquid mixing tank 23 disappears. Therefore, in this embodiment, the air that supplies air into the gas-liquid mixing tank 23 when the gas-liquid mixing tank 23 is almost full of bath water or when the amount of stored water in the bath water becomes more than necessary. The introduction process is executed.
[0033]
This air introduction process will be described. For example, when it is directly detected by a water level sensor (not shown) that the amount of water stored in the bathtub water in the gas-liquid mixing tank 23 exceeds the required amount or indirectly by measuring the operation duration time, the circulation pump 22 Is stopped and the air valve 27 is opened for a required time. When the driving of the circulation pump 22 is stopped and the air valve 27 is opened as described above, the gas-liquid mixing tank 23 is installed at a position higher than the upper limit water level L of the bathtub water in the bathtub 10 as described above. The bathtub water stored in the gas-liquid mixing tank 23 naturally flows out from the circulation passage 21 to the bathtub 10 side, and air is supplied from the air valve 27 into the gas-liquid mixing tank 23 as the water level decreases. It will be inhaled efficiently. Thereafter, the fact that the amount of water stored in the bathtub in the gas-liquid mixing tank 23 has fallen below the required level is detected directly by various water level sensors (not shown) or indirectly by measuring the opening time of the air valve 27. If detected, the air valve 27 is closed and the circulation pump 22 is re-driven.
[0034]
As described above, in the fine bubble generating device 20 in the first embodiment, the gas-liquid mixing tank 23 is disposed downstream of the circulation pump 22, and the bath water pressurized by the circulation pump 22 is stored in the gas-liquid mixing tank 23. It is made into the form which is made to inject | pour vigorously and dissolves it by entraining internal stored air. Thereby, since it is possible to avoid the bath water containing bubbles from flowing into the circulation pump 22 as in the prior art, it is not necessary to make the circulation pump 22 excellent in air lock resistance and expensive as in the prior art. This can contribute to the reduction of equipment costs. And since it is set as the form which dissolves air efficiently with respect to bathtub water in the gas-liquid mixing tank 23, many microbubbles 16 can be generated in the bathtub 10. FIG.
[0035]
By the way, the air dissolving ability with respect to the bath water in the gas-liquid mixing tank 23 of the fine bubble generating apparatus 20 was examined by experiment, and will be described. First, regarding the experimental conditions, the diameter of the injection nozzle 26 was 6 mmφ, the gas-liquid mixing tank 23 was a cylindrical container, the diameter was 75 mmφ, the height was 700 mm, and the passage flow rate was 8.0 L / min. The water temperature is 37 ° C., and the water quality is ion-exchanged water. As a result, as shown in FIG. 4, the amount of dissolved oxygen in ion-exchanged water is 14.3 mg / L after about 30 seconds from the start of operation, and maintains a substantially constant value for a certain period of time (about 5 to 7 minutes). After that, it decreases due to a decrease in the amount of air in the gas-liquid mixing tank 23. Therefore, it is possible to perform an air melting operation for generating continuous fine bubbles for a certain period of time, and to perform the operation again for a certain period of time by sucking air into the gas-liquid mixing tank 23 after a certain period of time has elapsed. Become.
[0036]
FIG. 5 is a circuit diagram of a bathtub system according to Embodiment 2 of the present invention.
[0037]
In the second embodiment, the configuration different from the first embodiment is to open the gas-liquid mixing tank 23 to the atmosphere after the operation is completed, etc., and drain the bathtub water in the gas-liquid mixing tank 23 to the outside instead of the bathtub 10 side. Is added.
[0038]
Specifically, a two-way valve 28 is interposed between the circulation pump 22 and the gas-liquid mixing tank 23 in the circulation passage 21, and a three-way valve 29 is interposed at a downstream position of the gas-liquid mixing tank 23. A drain pipe 30 is connected to the pipe. After the operation is completed, the controller 24 remains in the gas-liquid mixing tank 23 by closing the two-way valve 28 while opening the air valve 27 and switching the three-way valve 29 to the drain pipe 30 side. A process of draining the bathtub water to the outside is executed.
[0039]
In the second embodiment, since the gas-liquid mixing tank 23 is emptied after the operation is completed, the bath water remains in the gas-liquid mixing tank 23 and decays when left without restarting the operation for a long time. Such a phenomenon can be surely avoided, and if the operation is restarted, it is advantageous in that the time from the start of the operation to the air introduction process can be increased. However, even if such drainage treatment is not performed, if the operation is resumed, the bathtub water remaining in the gas-liquid mixing tank 23 is caused to flow out to the bathtub 10 side by introduction of new bathtub water. There is no problem as long as the operation is stopped.
[0040]
In addition, this invention is not limited only to the said embodiment, Various application and deformation | transformation can be considered.
[0041]
In the gas-liquid mixing tank 23 described in the first and second embodiments, relatively large bubbles are mixed in the process of dissolving the air in the bath water, and the bath water containing the bubbles is mixed with the gas-liquid mixing tank 23. May flow out from the bottom outlet.
[0042]
Considering such a phenomenon, it is desirable to avoid the outflow of relatively large bubbles by adopting the configuration shown in FIGS. 6 to 8, for example.
[0043]
FIG. 6 discloses a configuration in which a porous plate 40 is attached to the bottom side of the gas-liquid mixing tank 23 so as to separate the internal space into two parts, a bath water introduction space and a bath water outflow space. Here, the porous plate 40 has a plurality of micropores (reference numerals omitted) that allow only the bathtub water in which air is dissolved from the upper space of the gas-liquid mixing tank 23 to the lower space to pass and prevent the passage of relatively large bubbles. For example, ceramics or sintered metal.
[0044]
FIG. 7 discloses a configuration in which a partition plate 41 that divides the internal space into two upper and lower parts is attached to the bottom side of the gas-liquid mixing tank 23 and a cylindrical or square cylindrical body 42 is attached to the upper surface thereof. Has been. As the partition plate 41 here, in addition to a non-porous synthetic resin plate or metal plate, the above-described porous plate can be used. A through hole 41a having a size that penetrates vertically and allows foreign substances to flow out is provided. In this case, the bathtub water introduced into the gas-liquid mixing tank 23 is once stirred so that air is dissolved inside the cylindrical body 42, and detours from the upper opening of the cylindrical body 42 to the outer peripheral space. The bath water that has flowed out flows out from the through hole 41 a of the partition plate 41 through the outlet of the gas-liquid mixing tank 23.
[0045]
FIG. 8 discloses a configuration in which a drainage notch 42a is provided at least at one circumferential position on the lower end of the peripheral wall of the cylindrical body 42 in the configuration of FIG. In this case, after the operation is stopped, the bathtub water in the cylindrical body 42 gradually flows out to the through hole 41a of the partition plate 41 through the drainage notch 42a, so that the cylindrical body 42 can be emptied.
[0046]
In the example shown in FIG. 6, there is a concern that the porous plate 40 may be clogged over time due to foreign matters such as human hair and dirt mixed in the bath water. However, in the example shown in FIG. 7, since the partition plate 41 is provided with a relatively large through hole 41a, foreign matter such as human hair and dirt described above can easily flow out. This is advantageous in that it is maintenance-free.
[0047]
However, in the example shown in FIG. 7, when the bathtub water in the gas-liquid mixing tank 23 is drained naturally or forcibly after the operation of the fine bubble generator 20 is stopped, the bathtub water remains in the cylindrical body 42. Will do. This is because there is no problem because it is caused to flow out to the bathtub 10 side by the introduction of new bath water as the operation is restarted. However, in the case where the operation is left without restarting for a long time, it remains in the cylindrical body 42. There is a risk that the bathtub water to rot. On the other hand, as shown in the example shown in FIG. 8, if the drainage cutout 42a is provided in the cylindrical body 42, the bathtub water in the cylindrical body 42 can be drained after the operation is stopped. The trouble that was done is avoided.
[0048]
【The invention's effect】
In the fine bubble generating apparatus of the present invention, a gas-liquid mixing tank is disposed downstream of the circulation pump, and the liquid pressurized by the circulation pump is vigorously supplied into the gas-liquid mixing tank, and the internal stored air is entrained and dissolved. Since it is in such a form, the liquid containing bubbles does not flow into the circulation pump as in the conventional case, and there is no need to use an expensive circulation pump with excellent air lock resistance. In addition to having melting capacity, it can contribute to reduction of equipment cost.
[0049]
In addition, when the microbubble generator of the present invention is used, a large amount of microbubbles can be generated at a low cost, so that purification can be performed efficiently, and a feeling of bathing can be achieved if the storage tank is a bathtub. Can be increased.
[Brief description of the drawings]
1 is a configuration diagram showing a bathtub system according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the gas-liquid mixing tank in FIG. 1. FIG. 3 is a longitudinal sectional view of the gas-liquid mixing tank during operation. 4 is a diagram showing the results of examining the air dissolving ability of the gas-liquid mixing tank of FIG. 2. FIG. 5 is a block diagram showing a bathtub system according to Embodiment 2 of the present invention. FIG. 7 is a modified example of the mixing tank and corresponds to FIG. 2. FIG. 7 is a modified example of the gas-liquid mixing tank of the first and second embodiments, and corresponds to FIG. FIG. 9 is a modification of the gas-liquid mixing tank and corresponds to FIG. 3. FIG. 9 is a block diagram showing a conventional bathtub system.
DESCRIPTION OF SYMBOLS 10 Bath 20 Fine bubble generator 21 Circulation path 22 Circulation pump 23 Gas-liquid mixing tank

Claims (4)

A fine bubble generator for generating fine bubbles in the storage tank by taking out the liquid in the storage tank, dissolving the air in the liquid, and returning it to the storage tank,
A circulation passage connected to the liquid outlet and return port provided in the storage tank;
A circulation pump which is arranged in the middle of the circulation passage and circulates to take out and return the liquid in the storage tank;
The circulation passage is interposed downstream of the circulation pump, connected to the circulation passage so as to introduce the liquid from above and to flow out from the lower side to the storage tank side, and inside the liquid pressurized and introduced by the circulation pump. A gas-liquid mixing tank that entrains and dissolves the stored air and then passes while storing a part of the stored air;
An injection nozzle provided in a liquid inlet connected to the gas-liquid mixing tank;
And a spray nozzle set at a water flow resistance larger than the water flow resistance of the spray nozzle provided at the liquid introduction portion disposed at the return port and connected to the gas-liquid mixing tank. Bubble generator. In the fine bubble generator of Claim 1,
The gas-liquid mixing tank is provided with a porous member that separates the internal space from above and below. In the fine bubble generator of Claim 1,
The gas-liquid mixing tank is provided with a partition plate that divides the internal space into two parts, a liquid introduction side and a liquid outflow side, and receives liquid introduced on the surface of the liquid introduction side in the partition plate. A fine body characterized in that a cylindrical body is provided, and further, a through hole is provided in the outer peripheral area of the cylindrical body in the partition plate to allow the two partitioned spaces to communicate with each other to allow foreign matter to flow out. Bubble generator. In the fine bubble generator of Claim 3,
A fine bubble generating device, wherein the cylindrical body is provided with a drainage portion for allowing the liquid received therein to flow out to the through hole side when operation is stopped.

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