JP2007117799A - Microbubble generator and microbubble generating apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbubble generator used for generating bubbles with a diameter of <1 mm (i.e., microbubbles) in water, wherein the microbubbles can be easily and inexpensively generated. <P>SOLUTION: In the barrel part 5 of a water jet nozzle 3, water is passed through water permeable holes 9, 9a obliquely running with respect to the duct line thereof, thus swirling force is applied thereto, the tip of the water jet nozzle 3 is inserted into a water inlet port 13 of a tubular body 4, and flowing water is vigorously jetted in the vicinity of the water inlet port 13 provided with an air suction gap 4, thus air is taken into the flowing water. In this way, air bubbles are generated, and the air bubbles are destroyed with the shearing force of the swirling flowing water, thus smaller microbubbles are generated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a microbubble generator used to generate bubbles (so-called microbubbles) having a diameter of less than 1 mm in water.

Conventionally, this type of microbubble has been widely used for water purification in rivers and lakes, hydroponic cultivation of agricultural products, aquaculture, and washing of various items.
The fine bubble generator includes a fluid transfer pipe connected to the pressurized water supply means and provided with a communication portion on the side wall for communicating inside and outside, and a state surrounding the communication portion arranged around the fluid transfer pipe. And a pressurized gas supply means that is connected to the gas chamber and sends pressurized gas to the fluid transfer pipe through the communicating portion, and a porous layer is provided at the communicating portion. (See, for example, Patent Document 1).
In addition, some of the configuration of Patent Document 1 is changed, and a plurality of pores are spirally formed on the side wall of the fluid transfer pipe, and pressurized gas is ejected into the fluid transfer pipe through the pores. (See, for example, Patent Document 2).
Furthermore, it has a pressurized liquid and gas introducing part and a cylindrical bubble generating space, and a pressurized liquid introducing hole and a gas introducing hole that open to the bubble generating space are formed in the introducing part, and A pressure liquid introduction hole is opened at the end face of the introduction part, the gas introduction hole is opened at a side surface of the introduction part, and an adjustment valve for adjusting a gas introduction amount is provided in a gas introduction pipe communicating with the gas introduction hole. A thing can be seen (for example, refer patent document 3).

JP-A-8-225094 (Claim 1, FIG. 1) JP-A-8-230760 (Claim 1, FIG. 1) JP 2001-58142 A (Claim 1, FIG. 1)

  However, all of the devices described in Patent Documents 1 to 3 are complicated in structure and costly, and those described in Patent Documents 1 and 2 require pressurization for both gas and liquid, resulting in energy consumption. Was very uneconomical.

  In view of the above problems, the present invention provides a swirl force to running water by passing water through a water-permeable hole that runs obliquely with respect to the pipe line in the body of the fountain nozzle, and the tip of the fountain nozzle is connected to the water inlet of the pipe body By blowing the flowing water vigorously in the vicinity of the water inlet provided with an air suction gap, air is taken into the flowing water, thereby generating large bubbles, and ruptured by the shearing force of the flowing water swirling the large bubbles To produce even smaller microbubbles.

In short, the present invention provides a water blocking wall that crosses the pipeline in the body of the fountain nozzle that passes the supply water without pumping the supply water with a pump or the like, and has a water permeable hole in the thickness direction of the water blocking wall. Since the pipes are pierced, the flow rate can be increased and the water flow rate can be increased, and a plurality of permeation holes are provided along the perimeter of the water stop wall, and the inflow and outflow phases of each permeation hole are shifted and stopped. Since it is inclined with respect to the thickness direction of the water wall, it is possible to eject the flowing water from each of the water-permeable holes at an angle and impart a turning force to the flowing water.
Also, the inner diameter of the water inlet of the tube body is made larger than the outer diameter of the front end side of the conical nozzle provided in the fountain nozzle, and the front end side of the conical nozzle is inserted into such a water inlet, Since the air suction gap is formed between the air inlet and the inner surface of the water inlet, the air drawn from the air suction gap is discharged into the flowing water by spouting the flowing water into the pipe body while sucking it by connecting a pump downstream of the pipe body. When taken in, large bubbles with a diameter of 1 mm or more are generated.
Then, since the jet water is a swirling flow, the large bubbles are immediately ruptured by the shearing force, and fine bubbles having a diameter of less than 1 mm are generated.
As described above, since the gas and liquid are sucked by one pump in the present invention, the device configuration can be simplified and the initial cost can be reduced, and the air is drawn from the air suction gap opened to the atmosphere, so the pump suction force is low. Good running costs can be kept low.

  Immediately joining the water that has flowed obliquely from each water-permeable hole may cause the turning force to be canceled due to the collision due to the flow rate, etc. Since the rods are protruding, the running water does not immediately merge, but each swirls around the guide rod and then merges. Therefore, even if various conditions such as flow rate and flow velocity change, swirling the flowing water reliably, bubbles The generated water can be supplied stably.

  The fountain nozzle and the pipe body are housed and fixed in the case body, the upstream end of the fountain nozzle and the downstream end of the pipe body are communicated to the outside of the case body, an air introduction hole is provided in the case body, and the air suction gap Since the fountain nozzle is connected to the atmosphere, the fountain nozzle and the pipe body are unitized to facilitate installation and replacement, and to reduce the maintenance cost.

  The conical nozzle provided on the fountain nozzle is tapered, and one or both of the fountain nozzle and the pipe body can be moved forwards and backwards. By changing the amount of insertion, it is possible to adjust the width of the air suction gap and change the amount of suction air to avoid a reduction in the amount of generated bubbles.

  The water inlet of the tube is formed in a funnel shape with a narrower downstream side and a slant than the conical nozzle. Therefore, the adjustment width of the air suction gap should be increased to stabilize the amount of bubbles generated more reliably. I can do it.

The downstream end of the water supply path for sending water from the water supply means is connected to the connection means of the fountain nozzle of the fine bubble generator according to any one of claims 1 to 5, and the bubble water supply is connected to the connection means of the tubular body of the fine bubble generator. Connect the upstream end of the transport path, connect the downstream end of the bubble water transport path to the suction port of the pump, connect the upstream end of the transport path to the discharge port of the pump, and connect the downstream end of the transport path to the tank The bubble water supply port is provided in the lower part of the tank, so that even if there are residual large bubbles in the bubble generation water, the large bubbles and fine bubbles are separated in the tank, and higher quality fine bubble generation water can be obtained. Can be provided.
In addition, if an ultrasonic oscillator is attached to the tank, the practical effect is very large, such as microbubbles can be ruptured and ultrafine bubbles (so-called nanobubbles) having a diameter of less than 1 μm can be generated.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic longitudinal sectional view of a fine bubble generator according to the present invention, and FIG. 2 is a plan view.
As shown in FIGS. 1 and 2, the fine bubble generator 1 according to the present invention includes a fountain nozzle 3 connected to the downstream end of the water supply path 2 and a pipe body 4 disposed downstream of the fountain nozzle 3. .
The fountain nozzle 3 is provided with a connecting means 6 for connection with the water supply path 2 at the upstream end of the circular tubular body 5, while a tapered conical nozzle 7 is formed at the downstream end, and the pipe 5 is crossed in the body 5. A disc-shaped water blocking wall 8 is provided.

  The water blocking wall 8 is provided with a plurality of water-permeable holes 9, 9 a... In the thickness direction along the circumference of the water blocking wall, and the water-permeable holes 9, 9 a. A cylindrical guide rod 12 projects from the center of the surface of the water stop wall 8 on the outlet 11 side (surface on the downstream side). .

  On the other hand, the pipe body 4 is formed in a funnel shape in which the inner diameter of the water inlet 13 is larger than the outer diameter of the tip end side of the conical nozzle 7, the downstream side is narrower, and the slant is more inclined than the conical nozzle 7.

  Then, the tip of the conical nozzle 7 is inserted into the water inlet 13, the air suction gap 14 is formed between the tip of the conical nozzle 7 and the inner surface of the water inlet 13, and connecting means provided at the downstream end of the tube 4. 15 is connected to the upstream end of the bubble water transport path 16.

  It is preferable that one or both of the fountain nozzle 3 and the pipe body 4 are movable forward and backward with respect to the other. In this embodiment, a screw portion is provided on the outer peripheral surface of the fountain nozzle 3 and the pipe body 4. The connection means 6 and 15 are provided, and screw portions are provided on the inner peripheral surfaces of the water supply path 2 and the bubble water transport path 16 so that they can be moved forward and backward by being screwed together.

  Further, as shown in FIG. 3, the fountain nozzle 3 and the pipe body 4 are housed and fixed in the case body 17, and the upstream end of the fountain nozzle 3 and the downstream end of the pipe body 4 are communicated with the outside of the case body 17. The whole may be unitized. In this case, an air introduction hole 18 may be provided in the case body 17 so that the air suction gap 14 communicates with the atmosphere.

Next, an example of the fine bubble production | generation apparatus using the fine bubble generator of this invention is shown.
As shown in FIG. 4, the fine bubble generating apparatus connects the downstream end of the water supply path 2 for sending water from the water supply means 19 to the upstream end of the fine bubble generator 1 (the connection means 6 of the fountain nozzle 3). The upstream end of the bubble water transport path 16 is connected to the downstream end of the bubble generator 1 (connecting means 15 of the tube 4), and the downstream end of the bubble water transport path 16 is connected to the suction port 21 of the pump 20. The upstream end of the transfer path 23 is connected to the discharge port 22 of the pump 20, the downstream end of the transfer path 23 is communicated with the tank 24, and the bubbly water supply is supplied to the bubbly water supply port 25 provided at the lower part of the tank 24. A path 26 is connected, and a return water port 27 is provided in the upper part of the tank 24, and the return water port 27 and the air introduction hole 18 of the fine bubble generator 1 are communicated with each other through a return water path 28.

  As the water supply means 19, for example, a water supply pump or a water pipe may be used to pump the supply water. However, since the fine bubble generator of the present invention does not require a large pressurization to the supply water, The water supply means 19 may be used as the tank, and the water supply path 2 may be connected to the water storage tank to supply water by natural flow, and the return port 27 and the return water path 28 are not necessarily required and may be omitted.

Next, the operation of the fine bubble generator and the fine bubble generator will be described.
The water sent to the fine bubble generator 1 passes through the body portion 5 of the fountain nozzle 3, and a part of the water directly collides with the water blocking wall 8 and then passes through the water-permeable holes 9, 9 a.
At this time, since the cross section of the flow path is abruptly narrowed, the water flow speed is increased, and the water flow holes 9, 9 a... The water flowing out obliquely flows around the guide rod 12 because the guide rod 12 protrudes from the water-permeable holes 9, 9 a. After swirling, they merge to form a swirling flow, pass through the conical nozzle 7, and spray from the tip to the water inlet 13 of the tube body 4.

On the other hand, on the tube body 4 side, a pump 20 is connected to the downstream end of the tube body 4 and suction is performed by the pump 20, so that the air pressure in the tube body 4 decreases and air is drawn from the air suction gap 14.
Then, since the water spouted from the conical nozzle 7 is swirling, the surface of the flowing water is not smooth and uneven, and a lot of air is taken into the water by this unevenness, and the air taken into the water Some become fine bubbles with a diameter of less than 1 mm as they are, and large bubbles with a diameter of 1 mm or more are ruptured by the shearing force of the swirling flow and become fine bubbles with a diameter of less than 1 mm.

  Incidentally, as shown in FIG. 3, the bubble generation amount can be adjusted by changing the insertion amount of the conical nozzle 7 into the water inlet 13 to adjust the width of the air suction gap 14 and changing the amount of air to be sucked. .

Also, since the fine bubbles are very small and buoyancy does not work, they do not rise and float freely in the water and are evenly dispersed, while large bubbles rise by buoyancy and collect on the water surface. Once the tank 24 is connected and once stored in the tank 24, the large bubbles remaining in the bubble generation water rise in the tank 24, so if taken out from the bubble water supply port 25 at the bottom of the tank 24, only the fine bubbles are included. High quality fine bubble-generating water is obtained.
The water containing a large amount of large bubbles in the upper part of the tank 24 passes through the return water port 27, passes through the return water path 28, and is returned to the fine bubble generator 1 from the air introduction hole 18.

It is a schematic longitudinal cross-sectional view of the fine bubble generator which concerns on this invention. It is a top view of a microbubble generator same as the above. It is a schematic longitudinal cross-sectional view of the unitized microbubble generator. It is the schematic of the fine bubble generator apparatus using a fine bubble generator same as the above.

Explanation of symbols

2 Water supply path 3 Fountain nozzle 4 Tube 5 Body 6 Connection means 7 Conical nozzle 8 Water blocking wall 9, 9a ... Water-permeable hole
10 Inlet
11 Outlet
12 Guide bar
13 Water inlet
14 Air suction gap
15 Connection method
16 Bubble water transport route
17 Case body
18 Air introduction hole
19 Water supply means
20 Pump
21 Suction port
22 Discharge port
23 Transfer route
24 tanks
25 Bubble water supply port

Claims (6)

  A fountain nozzle connected to the downstream end of the water supply path, and a tube disposed downstream of the fountain nozzle, the fountain nozzle is provided with means for connecting to the water supply path at the upstream end of the circular tubular body, A tapered conical nozzle is formed at the downstream end, and a water blocking wall is provided in the body portion so as to cross the pipeline. The water blocking wall has a plurality of rows of permeation holes along the circumference of the water blocking wall. Each water-permeable hole is inserted obliquely with respect to the wall thickness direction of the water blocking wall with a phase shifted at the inlet and outlet, and the inner diameter of the water inlet of the tubular body is the outer diameter of the tip side of the conical nozzle. The tip of the conical nozzle is inserted into such a water inlet, the air suction gap is formed between the tip of the conical nozzle and the inner surface of the water inlet, and a bubble water transport route is formed at the downstream end of the tube. A fine bubble generator characterized in that it is provided with means for connecting to the upstream end of the microbubble generator.   The fine bubble generator according to claim 1, wherein a guide rod protrudes in the center of the surface of the water blocking wall on the outlet side.   The fountain nozzle and the pipe body are housed and fixed in the case body, the upstream end of the fountain nozzle and the downstream end of the pipe body are communicated to the outside of the case body, an air introduction hole is provided in the case body, and the air suction gap The fine bubble generator according to claim 1 or 2, wherein the air bubble is communicated with the atmosphere.   4. The fine bubble generator according to claim 1, 2, or 3, wherein one or both of the fountain nozzle and the pipe body are movable forward and backward.   The fine bubble generator according to claim 1, 2, 3, or 4, wherein the water inlet of the tube body is formed in a funnel shape that is narrower on the downstream side and is gentler than the conical nozzle.   The downstream end of the water supply path for sending water from the water supply means is connected to the connection means of the fountain nozzle of the fine bubble generator according to any one of claims 1 to 5, and the bubble water supply is connected to the connection means of the tubular body of the fine bubble generator. Connect the upstream end of the transport path, connect the downstream end of the bubble water transport path to the suction port of the pump, connect the upstream end of the transport path to the discharge port of the pump, and connect the downstream end of the transport path to the tank And a bubble water supply port at the bottom of the tank.

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