JP2554609B2 - Gas dissolved liquid manufacturing equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-dissolved liquid producing apparatus for producing a large amount of a liquid in which a gas is efficiently dissolved or bubbles are mixed and dispersed in a liquid.

[0002]

2. Description of the Related Art Conventionally, as a device for dispersing and dissolving a large amount of gas in a liquid, there is a device using a so-called ejector type bubble generator and a bubble column. This is because a liquid jet ejected from a nozzle is once passed through a gas to be mixed, and a gas mixture jet is injected into a bubble column from a throttle provided coaxially with the nozzle and having a diameter substantially equal to the jet, A large amount of gas is dissolved by mixing micro bubbles in the liquid to produce a liquid in which a desired gas is dissolved. On the other hand, there is also one in which gas and liquid are fed into a pressure pump to pressurize the liquid in the pressure pump and dissolve gas from bubbles in the liquid into the liquid.

[0003]

In the case of the above-described conventional generator using the bubble column, the center of the liquid injection nozzle of the ejector and the center of the throttle must be aligned, and the structure of the device is complicated. Manufacturing was difficult, and the mixing ratio and dissolution amount of gas were not sufficient. Further, in the gas dissolution by the bubble column, the rise time until the liquid in which the gas is sufficiently dissolved is obtained is long and the production efficiency is not good. Furthermore, in the case of using the above-mentioned conventional pressure pump, since gas and liquid are sent together into the pressure pump,
Cavitation is likely to occur in the pump, and there is a problem that the material and structure of the pump are limited, and the manufacturing efficiency is not good.

The present invention has been made in view of the above-mentioned problems of the prior art. It has a simple structure and can efficiently dissolve a gas in a liquid, and easily produce a large amount of a gas-dissolved liquid. An object of the present invention is to provide an apparatus for producing a gas solution capable of performing.

[0005]

According to the present invention, there is provided a liquid supply section for sending out a liquid that dissolves gas at a predetermined pressure, and a mixer for mixing the liquid pressure-fed from the liquid supply section with a predetermined gas. Provided in the mixer, a throttle portion such as a Venturi tube or an orifice provided in the liquid flow path, and a gas inlet provided slightly downstream of the throttle portion are formed, and the throttle portion continues from the throttle portion. The gas inflow port, which is formed by gradually widening the pipe line and the liquid in the flow path provided downstream of this widening part and the gas flowing in from the gas inflow port.
At the mixing part that dissolves and mixes under a pressure higher than the static pressure of the gas, and the gas- liquid mixed flow is ejected at the outlet of this mixing part.
And a nozzle portion for precipitating the dissolved gases bubbles in shear to Rutotomoni liquid provided in the mixer, from said gas inlet
If the pressure of the inflowing gas is less than the static pressure at the outlet of the nozzle,
In some cases, the widening at the connection of the gas inlet
From the cross-sectional area of the nozzle,
Set so that the sum is larger and the above gas
From the pressure of the gas flowing in from the inlet,
Low static pressure of the liquid in the spread part at the connection site
So that the total cross-sectional area of the nozzle opening is set to
The gas dissolving solution manufacturing apparatus is provided with a gas supply unit connected to the gas inlet of the mixer, a nozzle unit of the mixer connected to the liquid storage unit, and a liquid in which the gas dissolved in the mixing unit flows.

Further, the present invention isLiquid that dissolves gas
Liquid supply part that sends out the body at a predetermined pressure, and this liquid supply
Mixer for mixing a liquid fed under pressure from a part with a predetermined gas
And a bench installed in the liquid flow path in this mixer.
Throttle pipe, orifice, etc.
And a gas inlet provided on the downstream side of the
In addition, from the above-mentioned narrowing part, the widened part where the pipeline is gradually expanded
And the above-mentioned gas
A mixture that dissolves and mixes with the gas flowing from the body inlet under pressure
A gas-liquid mixed flow is ejected at the junction and the outlet of this mixing section.
Nozzle that causes the dissolved gas to precipitate in the liquid
And a gas supply section at the gas inlet of the mixer.
Connect, the nozzle part of the mixer is connected,
A liquid storage part into which the liquid in which the gas is dissolved flows.
The continuity equation in body mechanics and Bernoulli's theorem
At the connection point of the gas inlet given by
Static pressure P of the liquid in the spreading portion _A IsS_AIs a gas flow
Cross-sectional area of the widened portion at the inlet connection site, S_BIs
Sum of cross-sectional area of nozzle mouth, P₁Is the above gas inlet connection
The total pressure of the widened part in the area, δP, is the gas inflow
From the widened part at the mouth connection part to the nozzle part
Pressure loss at P, P_BIs the static pressure at the outlet of the nozzle
And P_A= (1-S² _B/ S² _A) P₁+ (ΔP + P_B) S² _B/ S² _A And this P_AAnd flows in through the gas inlet (46)
Gas pressure P_GAnd P_A<P_G  It is an apparatus for producing a gas solution that satisfies the above conditions. Also, the above nozzle
A plurality of nozzle openings are formed in the part.
Furthermore, a tube that doubles as the mixing section with the throttle section and the nozzle section.
It was connected by road.

[0007]

The gas-dissolved liquid producing apparatus according to the present invention allows the gas to flow from a gas inlet port slightly downstream of a throttle portion such as a throat portion or an orifice of a venturi tube of a mixer with respect to a liquid pumped from a pump. The mixed gas bubbles are sheared and subdivided due to the turbulence of the flow at the outlet nozzle, which is caused by the inflowing gas being pressure-dissolved in the liquid at the mixing part where the flow slows down and the static pressure increases. In this way, the gas solution is obtained in real time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the apparatus for producing a gas solution of the present invention will be described below with reference to the drawings. 1 and 2 show a gas-dissolved liquid production apparatus according to a first embodiment of the present invention. As shown in FIG. 1, a water tank 10 as a liquid supply unit and a pump 12 for pumping a liquid are provided with a pipe line 14. It is connected and provided by
A mixer 18 is attached to the output side of the pump 12 via a pipe 16. The mixer 18 is attached to the bottom of a water tank 20, which is a liquid storage unit for storing a liquid in which gas is dissolved, with a nozzle portion 24 provided in the mixer 18 being opened. Further, a pipe line 26 for supplying gas to the mixer 18
Is connected to the gas tank 30 via the flow rate adjusting valve 28. Further, a pipeline 34 connected to the water tank 10 via a relief valve 32 is connected to the pipeline 16.

The mixer 18 for mixing a gas into a liquid includes
A Venturi tube 42 having a throat portion 40 forming a narrowed portion in the center is provided. This Venturi tube 42
A gas inlet port 46 for mixing the gas sent from the gas tank 30 into the flow channel is formed in the expanded portion 44 on the downstream side of the gas inlet port slightly downstream of the throat portion 40.
The end of the pipe line 26 is connected to 6. A mixing portion 48 that mixes the gas flowing from the gas inlet 46 with the liquid in the flow path is formed on the downstream side of the spreading portion 44. The outer diameter of the mixing portion 48 can be arbitrarily set according to the degree of pressurization. Here, the mixing portion 48 is formed to have a shape extending from the maximum diameter of the widening portion 44. A nozzle portion 24 having a nozzle opening 50 is attached.

The operation of the gas-dissolved liquid manufacturing apparatus of this embodiment will be described below. The liquid in the water tank 10 is pumped to the mixer 18 by the pump 12, and the liquid flowing into the inlet portion 52 of the mixer 18 is accelerated in the throat portion 40 of the Venturi pipe 42 to temporarily reduce the static pressure, and then the spread portion 44. After that, the flow velocity decreases and the static pressure increases again. At this time, the gas inlet 46 is
Since it is on the slightly downstream side of the throat portion 40 and the static pressure in this portion is relatively negative, gas flows into the flow path. The reason why the gas inlet port 46 is not arranged in the throat portion 40 is the portion where the static pressure is the lowest in the throat portion 40.
This is because when the gas inlet port 46 is provided in the throat portion 40, the gas is not sucked in well and the gas is more likely to flow into the throat portion where the flow path has started to spread.

The gas flowing from the gas inflow port 46 becomes bubbles and flows into the mixing section 48 together with the liquid in the flow path. Since the bubbles become higher than the static pressure throat section 40 of the mixing section 48, they become liquid. Dissolves in. Then, the liquid is ejected together with the bubbles from the mixing section 48 through the nozzle port 50. When passing through the nozzle port 50, the liquid is accelerated again, so that its static pressure becomes low and the gas dissolved in the liquid is deposited as fine bubbles. Further, the bubbles that are not completely dissolved are also fragmented due to the turbulence of the flow when accelerated at the nozzle port 50, and become bubbles with a small diameter to be ejected together with the liquid. The bubbles ejected from the mixer 18 are dispersed in the liquid in the water tank 20 by the jet flow and are formed into fine bubbles, so that they are suspended in the liquid for a long time.

Here, the relief valve 32 is for returning the pressure-fed liquid to the water tank 10 through the conduit 34 when the pressure is equal to or higher than a predetermined pressure in order to make the pressure of the pressure-fed liquid constant. Further, the flow rate adjusting valve 28 is for adjusting the gas flow rate so that fine bubbles are efficiently formed in the liquid. Experimentally, the gas flow rate is 10 to 30 times the liquid flow rate.
%, A large amount of small bubbles were efficiently obtained in the liquid. In the gas-dissolved liquid production apparatus of this embodiment, when it is desired to always disperse air bubbles in the liquid, the water tank 10 and the water tank 20 are commonly used to circulate the liquid. Etc. should be connected.

In the gas-liquid dissolving and mixing apparatus of this embodiment, the expanded portion 44 at the connecting portion of the gas inflow port 46 and the nozzle port 5 are connected.
The relation with the sum of the cross-sectional areas of 0 may satisfy the following formula. P _A <P _G (1) P _G is the pressure of the gas flowing in from the gas inflow port 46. P _A is the static pressure of the liquid at the widened portion 44 at the connection site of the gas inlet 18 given by the following equation according to the equation of continuity in hydrodynamics and Bernoulli's theorem.

P _A = (1-S ² _B / S ² _A ) P ₁ + (δ
P + P _B ) S ² _B / S ² _A (2) Here, S _A is a cross-sectional area of the expanded portion 44 at the connection portion of the gas inlet port 46,
S _B is the total cross-sectional area of the nozzle port 50, P ₁ is the total pressure of the expanded portion 44 at the connection portion of the gas inlet port 46, and δP is the pressure from the expanded portion 44 at the connection portion of the gas inlet port 46 to the nozzle port 50. The loss, P _B, is the static pressure at the outlet of the nozzle port 50.

Therefore, by setting the sizes of the expanding portion 44 and the nozzle port 50 at the connecting portion of the gas inlet port 46 so as to satisfy the above equations (1) and (2), the gas can be efficiently introduced into the liquid. The optimum conditions for mixing and dissolving are obtained. Specifically, the equation (2) is inserted into the equation (1),
Further, if P _G = kP _B (k> 0), the following equation
(3) can be derived. 0> δP · S ² _B / S ² _A + (S ² _B / S ² _A −k) P
^{_{B + (1-S 2 B}} / S 2 A) P 1 = δP · S 2 B / S 2 A + (1-k) P B + (1-S 2 B / S 2 A) · (P 1 - P _B ) ... (3) In this equation (3), the pressure loss δP is a positive value and
The first term is a positive value. Also, normally, from the gas inlet 46
The pressure P _G of the inflowing gas is the static pressure at the outlet of the nozzle port 50.
It is a value less than or equal to P _B , in which case k is 0 <k ≦ 1.
is there. Then, the second term of the above formula (3) is also 0 or more.
Therefore, the third term of equation (3) must be negative,
In that case, the widened portion at the connection portion of the gas inlet port 46
The total pressure P _{1 of} 44 is, of course, the outlet of the nozzle port 50 on the downstream side.
Is larger than the static pressure P _{B of}
(3) the third term of ^{_{(1-S 2 B / S}} 2 A) sounds a negative value
I have to. From the above, S ² _B / S ² _A > 1
Of the expanded portion 44 at the connection portion of the gas inlet port 46.
Sectional area _{S A,} towards the sum _{S B} of the cross-sectional area of the nozzle opening 50
Must be set large. Also, the gas inlet 4
The pressure P _{G of} the gas flowing in from 6 is the outlet of the nozzle port 50.
If the static pressure is larger than P _B (k> 1), the above pressure loss
Considering δP etc., gas as appropriate so as to satisfy equation (3)
The cross-sectional area S of the expanded portion 44 at the connection portion of the inflow port 46
Than _A, decreases towards the sum S _B of the cross-sectional area of the nozzle opening 50
Or vice versa. For the setting of the nozzle port 50, a plurality of types of nozzle portions 24 having a fixed diameter of the nozzle port 50 are prepared and appropriately selected from those, or the nozzle port 50 is processed and formed each time. Alternatively, it goes without saying that the nozzle portion 24 having the variable nozzle port 50 may be used. Further, the mixing section 48 is more preferably one that can obtain a gas-liquid contact time until the gas is dissolved and saturated in the liquid under pressure, and the gas-liquid contact time depends on the volume of the mixing section. The gas dissolves up to the saturation point when the length of the mixing part is longer to some extent. Further, when it is not necessary to dissolve the mixture to the saturated state, the mixing section 48 may be short.

Table 1 shows the results of an experiment in which ozone was dissolved in water using the apparatus for producing a gas solution of this example. Here, the ozone generation amount is 10,000 ppm, and a 0.7 m long stainless steel pipe is used for the mixing portion 48 of the mixer 18.

[0017]

[Table 1]

In Table 1, the starting time is the rising time until the ozone water of a predetermined concentration can be continuously produced after the start of the apparatus, and when the conventional bubble column is used. Compared with the rise time of about 30 minutes, the gas-dissolved liquid production apparatus of this example is capable of efficiently producing gas-dissolved water in an extremely short time.

Next, a second embodiment of the present invention will be described with reference to FIG. Here, the same members as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. The gas-dissolved liquid manufacturing apparatus of this embodiment does not require mixing and dispersion of air bubbles, and the mixer 18 includes a main body portion 54 provided with a venturi tube forming a throttle portion and a nozzle portion 5 having a nozzle opening.
6 and 6 are separated, and both are connected by a conduit 58 which also serves as a mixing section.

The pipe 58 may be a steel pipe or a flexible pipe, and the gas and liquid are mixed more efficiently when the flow becomes turbulent, so that the pipe 58 is set in a spiral shape or The condition may be set such that the Reynolds number of 58 is equal to or more than a value that causes turbulence. Alternatively, a tube may be connected to the tip of the nozzle portion 56 to decelerate the liquid ejected from the nozzle portion 56.

According to the apparatus for producing a gas-dissolved liquid of this embodiment, the position of the nozzle portion 56 can be freely set,
It is also possible to freely move only the nozzle portion 56, the degree of freedom is increased, and it is possible to easily manufacture a large amount of the gas-dissolved liquid.

Next, a third embodiment of the present invention will be described with reference to FIG. Here, the same members as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. The mixer 60 of this embodiment is obtained by extracting a plurality of the conduits 58 of the second embodiment from the main body portion 54. Thereby, it is possible to easily store the gas-dissolved liquid in a large number of water tanks at the same time, and the manufacturing efficiency is extremely good.

The apparatus for producing a gas-dissolved liquid of the present invention can dissolve a gas in a liquid and disperse a large amount of bubbles in the liquid, and the method of using the device is not limited. Further, the throttle portion can be appropriately set such as a venturi tube or a sharply narrowed orifice, and the shape and number of nozzle portions can also be appropriately set in accordance with predetermined conditions. Further, the gas supply unit is not limited to one provided with a pump, and may be any one that sends out a liquid to the mixer, and includes a case where a liquid under pressure such as tap water is supplied.

[0024]

According to the gas-dissolved liquid producing apparatus of the present invention, the gas is introduced into the liquid slightly downstream of the throttle portion provided in the liquid flow path of the mixer, and the expansion portion connected to the throttle portion is connected. Since the gas and the liquid are mixed in the downstream and the gas-liquid mixed flow is ejected from the nozzle portion provided at the outlet, a large-scale and efficient production of the gas-dissolved liquid can be performed by a small-sized manufacturing device with a simple structure. It is possible. Furthermore, compared with the case of using a conventional bubble column, a large amount of gas is dissolved in the liquid by the time it comes out of the nozzle portion, so the time for dissolving the gas in the liquid can be greatly shortened. There is no need for a large bubble column for melting, and the rise time is extremely short.

Further, the apparatus for producing a gas solution according to the present invention is
Since the number and position of the nozzle parts can be set freely, manufacturing becomes easier. Furthermore, by making the nozzle part separate from the mixer body part, the position of the nozzle part can be set more freely. It is possible to manufacture the gas-dissolved liquid in a plurality of tanks at the same time by using a single mixer body, thereby making the manufacture of the gas-dissolved liquid easier and cheaper.

[Brief description of drawings]

FIG. 1 is a pipeline diagram of a first embodiment of a gas dissolved liquid production apparatus of the present invention.

FIG. 2 is a vertical cross-sectional view of a mixer of the apparatus for producing a gas solution according to this embodiment.

FIG. 3 is a pipeline diagram of a second embodiment of the apparatus for producing a gas solution according to the present invention.

FIG. 4 is a schematic front view of a mixer of a third embodiment of the apparatus for producing a gas solution according to the present invention.

[Explanation of symbols]

 10, 20 Water tank 12 Pump 14, 16, 26, 34 Pipe line 18 Mixer 24 Nozzle part 30 Gas tank

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Masakazu Kashiwa, Inventor Masakazu Kashiwa 1-10-40 Mikuni Honcho, Yodogawa-ku, Osaka City, Izumi Electric Co., Ltd. (72) Takayuki Kinoshita 1 Mikuni-honcho, Yodogawa-ku, Osaka, Osaka 10-40 No. Izumi Electric Co., Ltd. (56) Reference Japanese Unexamined Patent Publication No. 2-280822 (JP, A) Actually opened 55-130735 (JP, U) Actually opened 49-122461 (JP, U)

Claims (4)

(57) [Claims] 1. A liquid supply section (10) for sending out a liquid that dissolves gas at a predetermined pressure, and this liquid supply section (10).
A mixer (18) for mixing the liquid pumped from the liquid and a predetermined gas is provided, and the mixer (18) has a throttle portion (40) provided in the liquid flow path and the throttle portion (40). A gas inlet port (46) provided slightly downstream of the pipe, and a widened portion (44) formed by gradually widening the pipe line following the narrowed portion (40) and the widened portion (44).
And the gas inflow port (4
6) with the gas flowing in from the above at the gas inlet (46)
A mixing part (4) for dissolving and mixing under a pressure higher than the static pressure of gas.
8), the nozzle portion (24) and the mixer to precipitate the dissolved gas bubbles ejected gas-liquid mixed flow provided at the outlet of the mixing section (48) in shear to Rutotomoni liquid (1
Gas which is provided in 8) and flows in from the gas inlet (46)
Is less than or equal to the static pressure at the outlet of the nozzle portion (24).
In the case of the above, at the connection part of the gas inlet (46)
From the cross-sectional area of the expanded portion (44), the nozzle portion (24)
Make sure that the total cross-sectional area of the nozzle port (50) is larger
Set to, and flow in from the gas inlet (46)
Depending on the pressure of the gas, the connection of the gas inlet (46)
The static pressure of the liquid at the spreading portion (44)
The total cross-sectional area of the nozzle port (50) should be
Set, connected to the gas inlet (46) of the mixer (18) a gas supply section (30), the nozzle portion of the mixer (18) (24) is connected the mixing section at (48) An apparatus for producing a gas-dissolved liquid, comprising: a liquid container (20) into which a liquid in which a gas is dissolved flows. 2. A liquid supply unit for supplying a liquid for dissolving a gas at a predetermined pressure, and a mixer (18) for mixing the liquid pumped from the liquid supply unit (10) with a predetermined gas, In this mixer (18), a throttle portion (40) provided in the liquid flow path and a gas inlet (46) provided slightly downstream of the throttle portion (40) are formed, and A widening portion (44) which is formed by gradually expanding the pipe line from the narrowing portion (40), a liquid in a flow channel provided downstream of the widening portion (44), and a gas flowing in from the gas inlet port (46). A mixing section (48) for dissolving and mixing under pressure, and a nozzle section (24) provided at the outlet of the mixing section (48) for ejecting a gas-liquid mixed flow and precipitating a gas dissolved in the liquid. Provided in the mixer (18), the gas inflow of the mixer (18) A liquid storage unit (20) in which a gas supply unit (30) is connected to a mouth (46), a nozzle unit (24) of the mixer (18) is connected, and a liquid in which gas is dissolved flows into the mixing unit (18). ), And the static pressure P _A of the liquid at the spread portion (44) at the connection portion of the gas inlet port (46) given by the following equation according to the equation of continuity in hydrodynamics and Bernoulli's theorem, , S _A is the cross-sectional area of the expanded portion (44) at the connection site of the gas inlet port (46), S _B is the total cross-sectional area of the nozzle port (50), P ₁
Is the total pressure of the expanding portion (44) at the connecting portion of the gas inlet port (46), and δP is from the expanding portion (44) at the connecting portion of the gas inlet port (46) to the nozzle portion (24). Pressure loss, P _B is the above nozzle part (2
When the static pressure at the outlet of ^{_{4), P A = (1}} -S 2 B / S 2 A) P 1 + ( a ^{_{δP + P B) S 2 B}} / S 2 A, the _{P A} and the gas inlet ( 46) _A gas dissolved liquid production apparatus in which the pressure P _{G of} the gas flowing in from 46) satisfies P _A <P _G. 3. The gas-dissolved liquid manufacturing apparatus according to claim 1, wherein the nozzle portion (24) is formed with a plurality of nozzle openings (50). 4. The throttle portion (40) and the nozzle portion (24).
The gas-dissolved liquid manufacturing apparatus according to claim 1 or 2, wherein the pipe and the pipe are connected to each other by a pipe line (58) which also serves as a mixing portion (48).