JP5575092B2 - Micro bubble generator - Google Patents

Description

  The present invention relates to a microbubble generator that generates microbubbles in a liquid fluid.

  Conventionally, there is a microbubble generator that generates fine bubbles (hereinafter referred to as microbubbles) in a liquid fluid.

  As such, “a casing having a flow path through which liquid fluid can pass from one end to the other, acceleration means for accelerating the liquid fluid toward the other end of the flow path, and introducing gas into the casing A microbubble generator comprising gas-liquid mixing means, wherein the accelerating means introduces the liquid fluid into a flow path of the casing from a direction intersecting an axial flow direction through which the liquid fluid passes through the casing. An inlet, a cone-shaped portion formed with a throat portion that narrows the cross-sectional area of the flow path from one end to the other end of the casing; and the throat portion provided in the throat portion so as to be displaceable in the axial direction. A valve body that regulates the liquid fluid that passes through the nozzle, and a divergent nozzle portion that is connected to the cone-shaped portion and that increases in cross-sectional area of the flow path toward the other end of the casing. Kurobaburu generator "has been proposed (see Patent Document 1).

  In addition, “a micro bubble generating part is provided at the end of the valve, and a liquid whose primary inflow amount is changed in accordance with the valve opening degree of the valve is caused to flow into the micro bubble generating part, thereby generating micro bubbles. There has been proposed a “microbubble generator” in which the amount of air taken in is changed in accordance with the increase or decrease of the negative pressure in the section so that either or both the bubble diameter and the bubble amount are adjusted appropriately (Patent Document 2). reference).

  These microbubble generators have means for generating a microbubble by taking a gas (air) into a liquid to form a liquid fluid, and in particular, by opening and closing a valve body molded near the discharge port, I always get bubbles. The technique described in Patent Document 1 uses a valve body in a liquid fluid to open and close the valve body to obtain arbitrary microbubbles. The technique described in Patent Document 2 obtains microbubbles by forcibly injecting air into a liquid fluid with an external pump.

Japanese Patent Laying-Open No. 2008-023435 (FIG. 1 etc.) JP 2010-000420 A (Brother 1 figure etc.)

  Each of the techniques described in Patent Document 1 and Patent Document 2 always attempts to obtain microbubbles having a certain diameter, and is a manual response. In other words, it can be said to be a manual microbubble generator for obtaining a necessary bubble diameter in advance. In other words, even if the diameter of the microbubble fluctuates due to some disturbance, the opening / closing degree of the valve element and the pump flow rate cannot be adjusted unless the user intends to make the adjustment.

  Thus, conventionally, it is a structure for constantly obtaining microbubbles having a constant diameter, and it was impossible to detect the state of microbubbles as a physical numerical value regardless of contact or non-contact. . That is, conventionally, most of the means for obtaining microbubbles having a constant diameter have been adjusted by the visual judgment of the user and the manual operation of the user.

  Therefore, unless the user intends to make adjustments, the diameter of the microbubbles cannot be adjusted (not implemented), and the microbubbles were emitted in a state where the microbubbles were not ideal. . In other words, the adjustment of the diameter of the microbubble is dependent on the user, and if the state of the microbubble is to be brought into an ideal state, the user must continuously monitor and adjust the diameter. Therefore, the burden on the user has increased greatly. In addition, depending on the opening of the valve body, the water flow may be affected, and there may be a quality problem such as the necessary water flow not being obtained or the part of the device itself being crushed. Sometimes it happened.

  The present invention has been made to solve the above problems, and provides a microbubble generator in which the diameter of microbubbles is automatically adjusted.

A microbubble generator according to the present invention includes a bubble generating structure that takes in a liquid and a gas and swirls a liquid fluid that mixes them, and discharges fine bubbles from a tip portion of the bubble generating structure. In the microbubble generating device, a sensor unit that is installed at the outer peripheral portion on the front end side of the bubble generating structure and detects vibration generated by the fine bubbles, and the bubble generating structure according to the vibration detected by the sensor unit A control unit that adjusts the amount of gas supplied to the gas and changes the diameter of the fine bubbles to be generated, and the bubble generating structure is configured such that the flow path cross-section is reduced in diameter toward the downstream side, The swirl chamber is configured to be swirled at high speed, and the inclined flow surface is located upstream of the swirl chamber and is inclined at an arbitrary inclination angle. And water inlet is connected to the said water inlet, said provided so as to penetrate the傾流surface is for ejecting a water jet to the傾流surface.

  According to the microbubble generator according to the present invention, the diameter of the microbubble can be automatically adjusted. Therefore, according to the microbubble generator according to the present invention, microbubbles having a desired diameter can be generated.

It is a partial cross section figure which shows typically the structure of the microbubble generator which concerns on Embodiment 1 of this invention. It is a figure which shows the example of a frequency characteristic which performed the FFT process by the control part on the signal detected by the sensor part of the microbubble generator which concerns on Embodiment 1 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a partial cross-sectional structure diagram schematically showing a configuration of a microbubble generator 100 according to Embodiment 1 of the present invention. FIG. 2 is a diagram illustrating an example of frequency characteristics in which a signal detected by the sensor unit 7 of the microbubble generator 100 is subjected to FFT processing by the control unit 9. Based on FIG.1 and FIG.2, the microbubble generator 100 is demonstrated. In addition, in the following drawings including FIG. 1, the relationship of the size of each component may be different from the actual one.

  The microbubble generator 100 automatically adjusts the diameter of the microbubble to generate a microbubble having a desired bubble diameter. The microbubble generator 100 includes a bubble generating structure 1, a water inlet 5, an air inlet 6, a sensor part 7, an external valve part 8, a control part 9, and a switch (selection means) 50. ,have.

  The bubble generating structure 1 has a cylindrical swirl chamber 2 formed therein. On the side surface (the side surface on the left side of the paper surface) located on the upstream side of the swirl chamber 2, the inclined flow surface 3 that is inclined at an arbitrary inclination angle is installed. The inclined flow surface 3 collides a fluid (hereinafter referred to as a liquid fluid) in a state where water and air radiated from a water flow radiation port 11 described later are mixed, and the liquid fluid flows in the axial direction of the swirl chamber 2. To change. The inclined flow surface 3 may be configured by inclining the inner wall surface of the bubble generating structure 1 or may be configured by attaching a member different from the bubble generating structure 1. Moreover, although the case where a liquid is water and a gas is air is demonstrated to an example, a liquid and gas are not specifically limited.

  The swirl chamber 2 is inclined so that the diameter of the flow passage cross section gradually decreases from the upstream side (tilting surface 3 side) to the downstream side, and is narrowed so that the diameter becomes the smallest at the minimum opening 10. Yes. That is, the swirl chamber 2 is formed in a tapered shape. A shear chamber 4 is formed on the downstream side of the minimum opening 10 of the swirl chamber 2. That is, the inlet diameter of the shear chamber 4 and the opening diameter of the minimum opening 10 are equivalent. And the shear chamber 4 is formed so that a diameter may be gradually expanded as the cross section of a flow path goes downstream.

  The most downstream portion (shear chamber 4) of the bubble generating structure 1 is configured such that the diameter of the end side surface (the wall surface of the shear chamber 4) increases toward the downstream side. It has a “mortar shape” having an arbitrary opening area A in which the opening area gradually increases. Here, a state in which the bubble generating structure 1, the swirl chamber 2, and the shear chamber 4 are integrally formed is shown as an example. However, they may be formed by combining the bubble generating structure 1, the swirl chamber 2, and the shear chamber 4 as separate bodies.

  The water flow inlet 5 passes through the bubble generating structure 1 (the bubble generating structure 1 including the inclined flow surface 3) and is provided at an arbitrary position on the inclined flow surface 3. The water inlet 5 supplies liquid such as water to the swirl chamber 2. The water flow inlet 5 becomes narrower as it approaches the inclined flow surface 3, and has a shape that is most narrowed down at the portion that merges with the inclined flow surface 3. That is, the water flow inlet 5 has a flow passage cross-sectional area that decreases toward the downstream, and the flow passage cross-sectional area becomes the smallest at the portion that merges with the inclined flow surface 3, that is, through the inclined flow surface 3. ing. The most narrowed portion is the water flow radiation port 11, and has an injection opening surface 12 for ejecting a water flow to the inclined flow surface 3.

  In addition, an air inlet 6 for taking air from the outside naturally or forcibly is connected to an arbitrary position of the water inlet 5 outside the bubble generating structure 1. That is, the water inlet 5 supplies the liquid to the swirl chamber 2 in a state where the air flowing in via the air inlet 6 is mixed. Furthermore, an external valve portion 8 for controlling the intake amount of air is installed at an arbitrary position upstream of the air inlet 6. That is, the amount of air taken into the air inlet 6 is adjusted by controlling the opening degree (including opening and closing) of the external valve portion 8.

  The valve opening / closing means of the external valve unit 8 is not particularly limited. For example, the flow rate of air flowing through the air inlet 6 may be controlled by a stepping motor drive type, and the flow rate of air flowing through the air inlet 6 with a two-way valve or a three-way valve whose opening degree can be adjusted including opening and closing. You may control.

  Next, the microbubble generation operation of the microbubble generator 100 will be briefly described. When the liquid (water) is pressurized using the rotational force of a pump (not shown), guided to the water inlet 5, and the liquid is sent out, the water flow with pressure applied by the action of the pump is generated inside the water inlet 5. It has occurred. Furthermore, air is taken into the water inlet 5 from the air inlet 6, and water and air are mixed at the water inlet 5. The liquid fluid in a state where water and air are mixed is radiated from the injection opening surface 12 of the water flow inlet 5 to the inclined flow surface 3 while maintaining a high pressure.

  The liquid fluid radiated to the inclined surface 3 collides with the inclined surface 3 and is changed to a flow directed in the axial direction of the swirl chamber 2. The liquid fluid radiated to the swirl chamber 2 proceeds toward the minimum opening 10 while rotating in the swirl chamber 2. In the minimum opening 10, the liquid fluid rotates at the highest speed and is radiated simultaneously with pressure to the next shear chamber 4. At this time, air is torn off from the water and microbubbles are formed. The microbubbles are radiated outward from the opening at the tip of the bubble generating structure 1 (the opening on the downstream side of the shear chamber 4).

  The bubble diameter of the microbubbles generated at this time is determined in combination with the amount of air taken in from the air inlet 6 installed on the upstream side of the bubble generating structure 1. Therefore, in order to adjust the amount of air taken in from the air inlet 6, the following structure (sensor unit 7, vibration waveguide unit 15) is attached to the microbubble generator 100. Further, the microbubble generator 100 is provided with a control unit 9 that controls the opening degree of the external valve unit 8 based on a signal transmitted via the sensor unit 7. The control unit 9 is provided with a frequency analysis unit (FFT unit: fast Fourier transform unit) (not shown) as one component.

  A sensor unit 7 is installed on the outer peripheral surface of the bubble generating structure 1. The sensor unit 7 may be any one that can handle any one of speed, acceleration, displacement, or all three types of form signals. A vibration waveguide unit 15 is connected to the sensor unit 7. The vibration waveguide unit 15 is installed so as to be paired with the sensor unit 7. The vibration waveguide unit 15 is mounted in the vicinity of the minimum opening 10 of the bubble generating structure 1. For example, the vibration waveguide 15 may be mounted so as to be buried inside the side wall of the bubble generating structure 1. The vibration waveguide unit 15 detects “bubble vibration” generated when the microbubbles are generated when the air is pulled by water and the generated microbubbles collide with the minimum opening 10 and the wall surface of the shear chamber 4. Is.

  “Bubble vibration” detected by the vibration waveguide unit 15 is used as a physical quantity necessary for the control described below. That is, “bubble vibration” detected by the vibration waveguide unit 15 is converted into a signal (time-voltage signal) by the sensor unit 7 and sent to the control unit 9 described below as a physical quantity necessary for control. It is used.

  The “bubble vibration” detected by the vibration waveguide unit 15 is transmitted as a time-voltage signal to the control unit 9 via the sensor unit 7. The control unit 9 performs frequency analysis on the received time-voltage signal by the frequency analysis unit. An example of the result of frequency analysis is shown in FIG. In FIG. 2, the vertical axis represents the vibration level and the horizontal axis represents the frequency (Hz).

  When the amount of air contained in the bubble is large, the bubble diameter increases. “Bubble vibration” generated at that time is detected as a frequency component (F1) having a peak in a low frequency band. Conversely, when the amount of air contained in the bubble is small or when the air is strongly compressed, the bubble diameter becomes small. “Bubble vibration” generated at that time is detected as a frequency component (F2) having a peak in a frequency band higher than F1. That is, the size of the microbubble diameter can be analyzed / confirmed by using the peak nature of the detected frequency component. It should be noted that a predetermined frequency component serving as a reference is set in advance, and the high and low frequencies are analyzed by comparison with the reference frequency component.

  And the control part 9 can monitor the frequency of the analyzed peak property, and can change freely the bubble diameter containing the microbubble to obtain by controlling the opening degree of the external valve part 8. FIG. . For example, microbubbles having a desired bubble diameter can be created by the following control.

(1) Bubble diameter constant control The bubble diameter including microbubbles generated in the bubble generating structure 1 may change depending on the amount of water introduced to the water inlet 5 and the external environment (for example, water temperature). . Depending on fluctuations in the external environment, it may be possible that a desired microbubble cannot be obtained. By analyzing “bubble vibration” corresponding to the bubble diameter detected by the sensor unit 7, the bubble generation state can be confirmed as described above.

  A frequency component having a peak characteristic of ideal “bubble vibration” generated according to the diameter of the microbubble generated in the bubble generating structure 1 molded in an arbitrary size or the bubble itself is stored as “positive” in advance. Keep it. Then, when a frequency component different from the frequency component caused by “bubble vibration” as “positive” is detected due to some environmental factor, it is possible to analyze that a desired bubble diameter is not obtained. If the control unit 9 determines that the numerical value is different from “positive”, the control unit 9 performs feedback control processing based on the comparison determination result, and adjusts the opening degree of the external valve unit 8. By doing so, it is possible to obtain microbubbles having a desired bubble diameter. The external valve unit 8 may be manually controlled as necessary.

(2) Bubble diameter real-time control (control that can change the bubble diameter in real time according to the user's request)
Microbubbles are effective for the expression of a warm bath effect by promoting blood flow, for example, washing and sterilization of bathtub tabs and bathtub piping. In addition, a bubble diameter larger than that of the microbubble can make the inside of the bathtub cloudy, for example, and exhibits effects such as “healing” coming from the appearance. Furthermore, for example, when a bubble having a larger diameter is generated when immersed in a bathtub, a bioactive effect such as “skinning” the entire body due to vibration caused by the bubble can be expected. Therefore, in the microbubble generator 100, it is possible to select the bubble diameter desired by the user in accordance with the application.

  The microbubble generator 100 is provided with a switch 50 that receives an instruction from the user. The switch 50 is electrically connected to the control unit 9. That is, the user can arbitrarily select a desired bubble diameter via the switch 50. When it is desired to generate a desired bubble diameter or to change the bubble diameter, the user may select an arbitrary bubble diameter via the switch 50. Since the bubble diameter generation state is detected by the sensor unit 7, the external valve unit 8 can be controlled in real time while the control unit 9 performs frequency analysis.

  In this way, the control operation is performed so that the state of the opening of the external valve portion 8 is always maintained at the time when the desired bubble diameter selected by the user is detected while checking the bubble generation state in real time. The desired bubble diameter selected by the user can be obtained with certainty. Note that the switch 50 is not particularly limited as long as it can receive an instruction from the user.

  As described above, according to the microbubble generating device 100, even if the liquid fluid flowing through the bubble generating structure 1 is subjected to disturbance such as a change in water temperature and the bubble diameter of the microbubbles varies, the variation factor is detected as the vibration frequency. When it is analyzed that the frequency has changed to a frequency at which the required bubble diameter cannot be obtained, the opening degree of the external valve portion 8 is automatically controlled so that the required bubble diameter is obtained, and the required bubble diameter is obtained. Can be obtained instantly.

  Also, according to the microbubble generating device 100, when the user selects an arbitrary bubble diameter in the installation environment, it is necessary to change the bubble diameter to be generated according to the selected bubble diameter. By adjusting the opening degree of the external valve portion 8 according to the bubble diameter, the bubble diameter selected by the user can be obtained instantaneously stably and automatically. That is, when the frequency component having the necessary vibration characteristics is detected, the state of the opening degree of the external valve portion 8 is maintained, and the bubble diameter selected by the user can be created. In addition, by always measuring / analyzing (monitoring) “bubble vibration”, it is possible to always obtain a stable bubble diameter by feeding back to the opening degree control of the external valve portion 8.

  For the sensor unit 7 shown in the embodiment, any signal such as the speed, acceleration, and displacement of “bubble vibration” may be detected, or some of them may be detected. In addition, the constituent material of the sensor unit 7 does not need to be specially selected such as a piezoelectric material or a piezoelectric material. In the first embodiment, the contact type sensor has been described as an example. However, the present invention is not limited to this, and a non-contact sensor using light or sound can exhibit the same effect.

  Moreover, the numerical value of the peak frequency accompanying the bubble diameter shown in FIG. However, the peak frequency value itself associated with the size of the bubble diameter is not interchanged, and there is no change in the peak frequency value occurring in the lower frequency band when the bubble diameter is larger than when the bubble diameter is small. .

DESCRIPTION OF SYMBOLS 1 Bubble generating structure, 2 swirl chamber, 3 inclined surface, 4 shear chamber, 4A shear chamber, 5 water inlet, 6 air inlet (gas inlet), 7 sensor part, 8 external valve part, 9 control part 10 minimum opening, 11 water flow emission port, 12 jetting opening surface, 15 vibration waveguide,
100 Microbubble generator.

Claims (5)

In a microbubble generator that includes a bubble generating structure that takes in liquid and gas and swirls a liquid fluid mixed with these at high speed inside, and discharges fine bubbles from the tip of the bubble generating structure.
A sensor unit that is installed on the outer peripheral portion on the front end side of the bubble generating structure and detects vibration generated by the fine bubbles;
A controller that adjusts the amount of gas supplied to the bubble generating structure in accordance with the vibration detected by the sensor unit and changes the diameter of the fine bubbles to be generated ;
The bubble generating structure is
A swirl chamber in which the cross section of the flow path is reduced in diameter toward the downstream side, and the liquid fluid is swirled at a high speed;
An inclined flow surface that is located upstream of the swirl chamber and is inclined at an arbitrary inclination angle;
The swirl chamber is connected to a water inlet for taking in liquid from the outside,
The water inlet is
Provided to penetrate the inclined surface,
A microbubble generator characterized by ejecting a water flow to the inclined flow surface . The bubble generating structure is
Located downstream of the pre-Symbol swirl chamber, and the most minimum diameter is small opening,
Said minimum opening communicating with said swirl chamber through the flow path cross-section has a, a shearing chamber whose diameter increases toward the downstream,
The inlet before Symbol water is connected a gas inlet for introducing gas from outside,
The gas inlet is provided with an external valve for controlling the amount of gas taken in,
The controller is
The microbubble generator according to claim 1, wherein an amount of gas supplied to the bubble generating structure is adjusted by controlling an opening degree of the external valve portion. The sensor unit is
The microbubble generator according to claim 1 or 2 , wherein at least one of speed, acceleration, and displacement of vibration generated by the fine bubbles is detected. Provide a selection means that can select the diameter of the fine bubbles,
The controller is
While controlling the opening degree of the external valve portion according to the signal from the selection means, it is confirmed whether the generated fine bubbles have a diameter selected by the selection means, based on the result, The opening degree of an external valve part is further controlled. The microbubble generator as described in any one of Claims 1-3 characterized by the above-mentioned. The controller is
The signal detected by the said sensor part carries out an FFT analysis. The microbubble generator as described in any one of Claims 1-4 characterized by the above-mentioned.

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