JP2009072664A - Microbubble sprayer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microbubble sprayer capable of spraying microbubbles uniformly from individual nozzle holes. <P>SOLUTION: The shower head 4 is composed of a shower head body 4A into which a pressurized liquid pressure-dissolving a gas is introduced, a fixed iris diaphragm 4a (the first restrictor) arranged in the connected part of the hose of the shower head body 4A and allowing a gas to generate by decompressing the pressurized liquid introduced so as to produce microbubbles and two or more nozzle holes 42 (the second restrictor) arranged in the head portion 4B at the tip of the shower head and spraying, out of the shower head, a liquid introduced from the fixed iris diaphragm 4a and containing microbubbles. The effective cross-section s<SB>1</SB>of the fixed iris diaphragm 4a is smaller than the total effective area s<SB>2</SB>of the spraying holes 42. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fine bubble ejector that ejects a liquid containing fine bubbles, and more particularly to a fine bubble ejector that can eject fine bubbles from each nozzle hole evenly.

  Conventionally, a fine bubble injector that injects fine bubbles into a liquid has been used. For example, as shown in FIGS. 1 and 3 of the publication, a fine bubble injector (redistribution device) shown in Japanese Patent Publication No. 6-93991 is provided with a pipe line to which a liquid in which bubbles are mixed or dissolved is supplied. And a venturi pipe connected to the pipe line, a nozzle section provided on the downstream side of the venturi pipe, having a duct, and a plurality of nozzle holes formed in the end face of the nozzle section.

In the conventional apparatus, when the liquid in which bubbles are mixed or dissolved is supplied to the venturi through the conduit, the liquid is accelerated at the throat of the venturi and flows into the duct. It is mixed with the liquid and ejected from each nozzle hole. When the liquid passes through each nozzle hole, the pressure is reduced by accelerating the liquid again, so that the gas dissolved in the liquid precipitates in the liquid as fine bubbles and dissolves in the liquid in the duct. The bubbles that have not been broken are subdivided when passing through the nozzle holes, and are ejected as small bubbles.
Japanese Patent Publication No. 6-93991 (see FIG. 1 and FIG. 3)

  In the conventional apparatus, as described in paragraph [0010] of the publication, the sectional area of the throat portion of the venturi pipe is about 1.5 times the total sectional area of the nozzle holes.

  In this way, when the cross-sectional area of the throat portion on the upstream side of the nozzle hole is made larger than the total cross-sectional area of the nozzle hole, the liquid supplied to the venturi pipe is each nozzle on the downstream side of the throat portion of the venturi pipe. The pressure is greatly reduced at the hole. In this case, it is not easy to uniformly depressurize each nozzle hole having a different formation position so as to deposit gas evenly from each nozzle hole.

  The problem to be solved by the present invention is to provide a fine bubble injector capable of ejecting fine bubbles uniformly from each nozzle hole.

  The invention of claim 1 is a fine bubble injector for injecting a liquid containing fine bubbles, an injector main body into which a pressurized liquid in which a gas is dissolved under pressure is introduced, and an upstream end side of the injector main body The first throttle for reducing the pressure of the introduced pressurized liquid to generate gas and generating fine bubbles and the downstream of the injector body are introduced from the first throttle. And a second diaphragm composed of a plurality of nozzle holes for ejecting the liquid containing fine bubbles to the outside of the injector body, and the effective sectional area of the first diaphragm is the effective cutoff of the second diaphragm. It is smaller than the area.

  In the invention of claim 1, since the effective sectional area of the first throttle on the upstream end side of the injector main body is made smaller than the effective sectional area of the second throttle on the downstream end side, it is introduced into the injector main body. The pressurized liquid is greatly depressurized by the first throttle, and as a result, gas is precipitated inside the injector body to generate fine bubbles, and the fine bubbles are uniformly dispersed inside the injector body. Bubble water containing these fine bubbles moves to the downstream side inside the injector body.

  Thereby, the liquid which contains this fine bubble equally is ejected from each nozzle hole of the downstream end side of an injector main body.

In the second aspect of the present invention, when the effective sectional area of the first diaphragm is s ₁ and the effective sectional area of the second diaphragm is s ₂ , the ratio of the effective sectional areas is s _1. / s ₂ satisfies s ₁ / s ₂ ≦ 1/2.

  Thereby, sudden pressure reduction can be performed with the first throttle, and as a result, a large amount of fine bubbles can be uniformly generated inside the injector body.

  According to a third aspect of the present invention, in the first or second aspect, the fine bubble injector is a shower head, and the first throttle is provided between the shower head and a connecting portion of a hose connected thereto. And the 2nd aperture_diaphragm | restriction is comprised by the several ejection hole formed in the head part of the shower head.

  In this case, it is only necessary to provide the first throttle at the hose connection portion of the shower head, so that the fine bubble injector can be realized easily.

  As described above, according to the fine bubble injector according to the present invention, the first throttle is provided on the upstream end side of the injector main body, and the second nozzle composed of the plurality of nozzle holes on the downstream end side of the injector main body. Since the diaphragm is provided and the effective sectional area of the first diaphragm is made smaller than the effective sectional area of the second diaphragm, after the liquid passes through the first diaphragm, fine bubbles are generated inside the injector body. The fine bubbles can be uniformly dispersed inside the main body of the injector, whereby the fine bubbles can be uniformly ejected from the nozzle holes of the main body of the injector.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 to FIG. 3 are diagrams for explaining a fine bubble injector according to an embodiment of the present invention. FIG. 1 shows the entire apparatus for producing fine bubbles having a shower head as a fine bubble injector according to this embodiment. FIG. 2 is an internal structural diagram for explaining the operation of the gas-liquid pressure-dissolution mixer constituting the fine bubble producing apparatus, and FIG. 3 is a sectional structural diagram of the shower head.

  As shown in FIG. 1, the microbubble manufacturing apparatus 1 includes an air-mixing pump 2 that sucks a liquid (here, water) and a gas (here, air) and discharges these mixed flows, and an air-mixing pump 2. Gas-liquid pressure dissolution mixer (mixing box) that introduces a mixed flow of discharged water and air and dissolves and mixes air in water by generating bubble nuclei of microbubbles in water ) 3 and a shower head (fine bubble ejector) 4 connected to the gas-liquid pressure-dissolution mixer 3.

  A pipe 20 for sucking water and a pipe 21 for sucking air are connected to the suction side of the air-mixing pump 2 via a connector 22. A strainer 20 a is connected to the tip of the pipe 20. As the strainer 20a, from the viewpoint of maintainability, a strainer such as a disk strainer that can be easily cleaned from the outside without disassembling the pipe is preferable. The strainer 20a is immersed in a pet washing tank such as a dog bath or a bathtub. A filter 21a, a check valve 21b, and a throttle 21c are connected to the pipe 21 in order from the tip side. Here, the check valve 21b is provided to prevent the fluid from flowing back to the filter 21a side when the air-fuel mixture pump 2 is stopped. The restrictor 21c is provided to limit the amount of air that flows in.

  The gas-liquid pressure-dissolution mixer 3 is disposed in the horizontal direction and is opposed to the upper passage 3A and the lower passage 3B that are opposed to each other with an interval in the vertical direction, and falls from the rear end of the upper passage 3A. The lower passage 3C has a falling passage 3C that connects the upper and lower passages 3A and 3B, and a passage 3D that extends shortly upward at the tip of the lower passage 3B.

  Since the gas-liquid pressurization-dissolution mixer 3 is formed in a substantially U-shape, the entire apparatus can be reduced in size by arranging the air-mixing pump 2 in the space on the side of the gas-liquid pressurization-dissolution mixer 3. At this time, the space 3S formed between the upper passage 3A, the lower passage 3B, and the falling passage 3C of the gas-liquid pressurization and dissolution mixer 3 is effectively used as a space for piping, thereby further increasing the entire apparatus. Can be downsized.

Between the tip of the upper passage 3A and the discharge side of the air-mixing pump 2, a pipe 23 for guiding the mixed flow of water and air discharged from the air-mixing pump 2 to the upper passage 3A is disposed. A nozzle 23a is connected to the tip of the upper passage 3A. Nozzle 23a, the water and mixed flow a predetermined flow rate of air (preferably 5 to 15 m / s) is provided in order to flow into the upper channel 3A as jet (jet stream) W _A (see FIG. 2) .

  At the tip of the lower passage 3B of the gas-liquid pressure-dissolution mixer 3, there is a connector 30a for piping 30 for flowing out pressurized water that has been processed in the gas-liquid pressure-dissolution mixer 3 and in which air is pressure-dissolved. (See FIG. 2). A shower head 4 is connected to the pipe 30. A drain pipe 31 is connected to the lower portion of the lower passage 3B via a connector 31a. The pipe 31 is for draining water remaining in the gas-liquid pressure-dissolution mixer 3 when the apparatus is not used. A pipe 32 is connected to the upper portion of the lower passage 3B through an air vent valve 32a for discharging surplus gas (excess air) in the gas-liquid pressurized dissolution mixer 3.

  An exhaust pipe 33 is connected to the upper part of the upper passage 3A of the gas-liquid pressure-dissolution mixer 3 via a connector 33c (see FIG. 2). This pipe 33 is for extracting the gas expanded inside the gas-liquid pressurization and dissolution mixer 3 when the microbubble production apparatus 1 is stopped, and a silencer 33 a is connected to the tip of the pipe 33. . An electromagnetic valve 33 b is provided in the middle of the pipe 33. As shown in the figure, the electromagnetic valve 33b is, for example, a 2-port 2-position switching valve. In this case, when the power is turned on, the pipe is opened and the exhaust to the silencer 33a is performed. . Further, the “open” operation of the electromagnetic valve 33b is preferably interlocked with the OFF operation of the air-mixing pump 2. In other words, when the air-mixing pump 2 is turned on, the electromagnetic valve 33b is “closed” and the pipe line is closed.

As shown in FIG. 2, the mounting position of the nozzle 23a to the upper passage 3A of the gas-liquid pressure dissolution mixer 3, water jet W _A ejected from the nozzle 23a is the position interfering the water surface W _L in the upper channel 3A preferable. Thereby, gas-liquid dissolution and generation of bubble nuclei are performed efficiently.

Horizontal length L of the upper channel 3A is preferably the length of the jet water flow W _A from the nozzle 23a is not stall. The length L, the flow rate of the water jet W _A and u, when the mounting height of the nozzle 23a is h, calculated by the following equation.
L <0.45u√h

The horizontal length L ′ of the lower passage 3B is long enough that a large bubble that sinks to the bottom at the entrance (right end in FIG. 2) of the lower passage 3B can rise while moving to the left in the lower passage 3B. It only has to have. This length L ′ is obtained by the following equation, where w is the flow velocity in the lower passage 3B, v is the rising speed of the bubbles, and k is the height of the lower passage 3B.
L '> kw / v

  Since it has been experimentally confirmed that the vertical length of the falling passage 3C has little influence on the generation of bubbles, it may be any length. However, by providing the falling passage 3C, it is possible to shorten the welding length when the gas-liquid pressurization / dissolution mixer 3 is manufactured. That is, the gas-liquid pressure-dissolution mixer 3 is configured by joining, for example, square pipes by welding. At this time, when the falling passage 3C is provided, each of the square pipes constituting each passage is provided. It is only necessary to weld the end portion, but when the falling passage 3C is not provided, it is necessary to weld the lower surface of the upper passage and the upper surface of the lower passage along the longitudinal direction, and the welding length becomes very long.

  As shown in FIGS. 1 and 2, the exhaust pipe 33 is connected to the highest position of the gas-liquid pressurization / dissolution mixer 3 because the air is easily extracted from above. If the pipe 33 is connected to a low position, the water inside the gas-liquid pressurization and dissolution mixer 3 continues to flow to the outside by the siphon principle after the apparatus is stopped depending on the installation state of the apparatus. It is to do.

  As shown in FIG. 3, the shower head 4 has a shower head main body 4 </ b> A and a head 4 </ b> B provided at the tip thereof. The shower head main body 4 </ b> A is fixed by screws to a connection fitting 41 fixed to the tip of the pipe 30. A fixed diaphragm (first diaphragm) 4a is interposed between the end of the shower head body 4A and the connection fitting 41. The fixed aperture 4a is configured by an orifice having a small hole 40 formed in the center of the disc. A plurality of small holes 40 may be formed. In addition, a large number of nozzle holes 42 are formed through the head portion 4 </ b> B, and these nozzle holes 42 constitute a second diaphragm. Each nozzle hole 42 preferably has a smaller diameter than the small hole 40.

Here, when the effective sectional area of the small hole 40 is s ₁ and the total effective sectional area of each nozzle hole 42 is s ₂ , s ₁ / s ₂ that is the ratio of the effective sectional areas is s ₁ / s _2. <1 (ie s ₁ <s ₂ )
Is satisfied, and s ₁ / s ₂ ≦ 1/2
Is preferably satisfied. This is to cause a sudden pressure reduction by the fixed throttle 4a.

  Next, the operation of the fine bubble manufacturing apparatus 1 configured as described above will be described.

  Water and air sucked from the pipes 20 and 21 merge at the connector 22 and flow into the air-mixing pump 2. The water and air that have flowed into the air-fuel mixture pump 2 are pressurized by the air-fuel mixture pump 2 and are jetted into the gas-liquid pressurization / dissolution mixer 3 through the pipe 23 and the nozzle 23a. At this time, the flow velocity of the jetted water and air mixed flow is preferably set to 5 to 15 m / s.

  Inside the upper passage 3A of the gas-liquid pressure-dissolution mixer 3, air is gradually dissolved in water under pressure and gas-liquid dissolution occurs. At this time, bubble nuclei (microbubbles having a particle size of 1 μm or less) that are the basis of the precipitated bubbles are formed. The water containing bubble nuclei falls downward through the falling passage 3C and flows into the lower passage 3B.

  In the lower passage 3B, the surplus gas 35 that could not be dissolved in water moves upward through the passage 3D, so that the pressurized water containing the bubble nuclei in which the air is dissolved under pressure is separated from the surplus gas.

  The pressurized water is extracted from the connector 30 a through the pipe 30 to the outside of the gas-liquid pressurizing / dissolving mixer 3 and introduced into the shower head 4. The pressurized water is rapidly depressurized when passing through the fixed restrictor 4a of the shower head 4, and as a result, the gas that has been oversaturated is precipitated, so that the particle size in the shower head main body 4A is several μ to several μs. Ten micro-bubbles (microbubbles) are generated, and bubble water in which these fine bubbles are uniformly dispersed in water is generated. The bubble water flows in the shower head main body 4A toward the downstream side, and is ejected from a number of nozzle holes 42 of the head portion 4B of the shower head 4.

  At this time, since each nozzle hole 42 of the head portion 4B has a smaller diameter than the small hole 40 of the fixed aperture 4a, bubbles that have grown inside the shower head 4 pass through each nozzle hole 42 of the head portion 4B. It is pulverized by turbulent flow, and thereby bubble water containing fine bubbles is ejected from the head portion 4B. The fixed throttle 4a is incorporated in the shower head 4, so that the pressurized state in the upstream side of the fixed throttle 4a, that is, in the gas-liquid pressurizing / dissolving mixer 3, is maintained.

  On the other hand, the surplus gas 35 that has moved upward through the passage 3D of the gas-liquid pressurized dissolution mixer 3 is discharged to the outside through the air vent valve 32a.

  In this case, bubbly water containing a large amount of fine bubbles is released from the shower head 4, so that the dirt on the body surface is removed together with the fine bubbles by bathing such bubbly water on the body. At this time, since the particle size of the fine bubbles is smaller than that of the pores, the fine bubbles can penetrate into the pores and the inside of the pores can be cleaned.

  Moreover, if the shower head 4 is used by being submerged in the hot water of the bathtub, the fine bubbles are filled in the bathtub and the hot water of the bathtub becomes cloudy. The same effect as the case can be obtained. In this case, if the shower head 4 is submerged in hot water of a dog bath (a washing tank for washing dogs, cats, etc.), a large amount of fine bubbles will adhere to the dog's body and the hair will rise. As a result, fine bubbles penetrate to the skin surface and the fine bubbles are repelled, thereby removing fat and oil from the body. Moreover, the dirt adhering to the hair is removed by repelling the fine bubbles adhering to the dog's hair.

  Thus, since it can wash | clean only with a lot of fine bubbles, the usage-amount of detergents, such as a shampoo, can be reduced, or detergents, such as a shampoo, can be used at all. Thereby, environmental pollution by waste water can be prevented, and as a result, an environment-friendly (that is, eco-friendly) device can be realized. Also, by not using detergent, it can be used to treat dog skin diseases.

  Furthermore, if the bubbly water is sprayed onto, for example, a vegetable garden or a farm, it is possible to perform pollination using the energy when fine bubbles in the bubbling water repel.

  Moreover, by making each nozzle hole 42 of the shower head 4 into a smaller diameter hole, the bubble water having fine bubbles is further finely separated, and the fine bubbles are repelled in each of the separated bubble waters. Mist can be generated.

  Furthermore, when configuring the shower head 4 as a fine bubble injector, it is only necessary to provide the fixed throttle 4a between the shower head main body 4A and the connection fitting 41, so that the shower head as a fine bubble injector can be simplified. Can be realized.

  As described above, according to the present embodiment, the fixed throttle (first throttle) 4 a is provided on the upstream end side of the shower head 4, and the plurality of nozzle holes (second throttle) 42 are provided on the downstream end side of the shower head 4. Since the effective cross-sectional area of the fixed throttle 4a is made smaller than the total effective cross-sectional area of each nozzle hole, fine bubbles are uniformly generated inside the shower head main body 4A after the pressurized water passes through the fixed throttle 4a. As a result, fine bubbles can be ejected from each nozzle hole 42 of the shower head 4 evenly.

It is a schematic block diagram of the whole fine bubble manufacturing apparatus which has a shower head as a fine bubble ejector by one Example of this invention. It is an internal structure figure for demonstrating the action | operation of the gas-liquid pressurization dissolution mixer which comprises the said microbubble manufacturing apparatus (FIG. 1). It is sectional structure drawing of the said shower head (FIG. 1).

Explanation of symbols

1: Microbubble production equipment

3: Gas-liquid pressure dissolution mixer

4: Shower head (fine bubble jet)
4a: Fixed aperture (first aperture)
42: Nozzle hole (second aperture)

Claims (3)

A fine bubble injector for jetting a liquid containing fine bubbles,
An injector body into which a pressurized liquid in which a gas is dissolved under pressure is introduced;
A first throttle for generating fine bubbles by precipitating a gas by depressurizing the introduced pressurized liquid, provided on the upstream end side of the injector body;
A second throttle comprising a plurality of nozzle holes provided on the downstream end side of the injector main body and for ejecting liquid containing fine bubbles introduced from the first throttle to the outside of the injector main body; Prepared,
The effective area of the first aperture is smaller than the effective area of the second aperture;
A fine bubble injector characterized by that. In claim 1,
When the effective sectional area of the first diaphragm is s ₁ and the effective sectional area of the second diaphragm is s ₂ , the ratio of effective sectional areas s ₁ / s ₂ is
s ₁ / s ₂ ≦ 1/2
Are satisfied,
A fine bubble injector characterized by that. In claim 1 or 2,
The fine bubble ejector is a shower head, the first throttle is provided between the shower head and a connecting portion of a hose connected thereto, and the second throttle is the shower It is composed of a plurality of ejection holes formed in the head portion of the head.
A fine bubble injector characterized by that.

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