KR100773037B1 - Supplying device for a liquid containing a gas - Google Patents

Abstract

(Problem) Provide a gas-liquid supply device having a sufficient structure of supplying dissolved oxygen and an air lift effect with a simple structure.

(Solution means) The gas-liquid supply device includes a suction pipe 1, a discharge pipe 2, an enlarged pipe 3, a supply pipe 4, an intake pipe 5, an intake air amount control valve 6, a pump 7, It is an apparatus comprised from the spherical plate 8, the screw 9, the throttle valve 10, etc., and a stirring member is provided in the expansion pipe 3 etc. as needed.

(Effect) The gas-liquid fluid is flowed by a pump, the air is collected at the center side with a screw, and it is uniformly supplied to the opening plate, and it is rapidly expanded and divided by the expansion tube, and the time for air dissolution in the expansion tube and the supply tube is set. Pressure is controlled with a throttle valve to change the solubility by pressurization.The combined action of these is to greatly improve the solubility of air into the water, supply a gas-liquid fluid containing high dissolved oxygen, or microbubble to lift the air. A gas-liquid fluid that exerts an effect can be supplied.

Gas-liquid fluid, flow path, gas supply system, pump, opening plate, pivot member, flow path section reduction means, stirring member. Turning wing.

Description

Gas-liquid supply device {SUPPLYING DEVICE FOR A LIQUID CONTAINING A GAS}

1 is an explanatory diagram showing an example of the entire structure of a gas-liquid supply device to which the present invention is applied.

2 is a side view including a partial cross section showing an example of an actual piping state after the discharge pipe of the apparatus.

3 is a sectional view showing one example of a pump usable in the apparatus.

4 is a plan view showing an example of an aperture plate usable in the apparatus.

Fig. 5 is a sectional view showing a structural example when the stirring member is provided in the apparatus.

6 (a) and 6 (b) are perspective views showing the wing portion of the stirring member, wherein (b) is a view for clarifying the structure of (a).

7 is an explanatory diagram showing another structural example of the air supply portion.

8 is an explanatory view of the flow state of the gas-liquid fluid in the stirring member.

9 is an explanatory diagram showing an appearance state of a gas-liquid fluid discharged from a supply pipe.

It is a figure which shows the state at the time of raising pressure in the said explanatory drawing.

It is a figure which shows the state at the time of raising pressure in the said explanatory drawing.

It is a figure which shows the state at the time of raising pressure in the said explanatory drawing.

(Explanation of symbols for the main parts of the drawing)                 

One; Suction pipe (tubular flow path) 2; Discharge tube (tubular flow path)

3; Expanding tube (tubular flow path) 4; Supply pipe (tubular flow path)

5; Intake pipe (gas supply system) 6; Intake air volume adjustment valve (gas supply system)

7; Pumps (pumps, pumps of constant capacity) 8; Opening Plate (Opening Plate, Perforated Plate)

9; Screw (turning member)

10; Throttle valve (Euro section reducing means, Channel section adjusting means)

11; Stirring member 12; Priority Wings (1st Wings)

13; Left turning wing (second turning wing) 12a, 12b; Both ends of the first turning wing

13b, 13a; Both ends 20 of the corresponding second turning vanes; Compressor (Gas Supply System)

21; Inlet pipe (gas supply system)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid supply device for adding gas to a liquid and supplying it as a gas-liquid fluid, and is particularly suitably used as a technique for regenerating water bodies deteriorated by an air lift action and an oxygen supply action.

As a technique for dissolving gas in a liquid, for example, a self-priming pump pumps water from a pond and simultaneously draws air into a mixing tank, sucks water from the pond, and saturates the pond and air. An oxygen supply device for aquaculture ponds, which is fed into a tank, pressurized by the discharge pressure of a self-priming pump, is saturated, and discharged into the pond has been proposed (see Japanese Patent Application Laid-Open No. 2-78064 and the drawings). . In this apparatus, the pressure value therein is varied by adjusting the amount of water discharged from the oxygen saturation tank, so that the pressure is saturated.

However, in such an apparatus, it is not easy to reach the aqueous solution near the saturation state because the inhaled water and oxygen are simply mixed with a pump and put into a tank. There is a problem that it takes a long time.

The present invention solves the above problems in the prior art, a gas-liquid supply device capable of supplying the gas and the air lift action in the water to be treated by dissolving the gas in a high concentration in the liquid in a short time or uniformly present as micro bubbles. It is a subject to offer.

In the present invention, in order to solve the above problems, the invention of claim 1 is a gas-liquid supply device for supplying a gas to the liquid as a gas-liquid fluid,

A tubular flow path through which the liquid and the gas-liquid fluid flow, a gas supply system connected to an upstream position of the flow path to apply the gas to the liquid, and a constant flow path to supply the liquid and the gas-liquid fluid. A pump provided at the position, an opening plate provided on the downstream side of the upstream position or any one of the downstream positions of the constant position so as to rapidly change the cross-sectional area of the flow path, and the upstream side in the vicinity of the opening plate. And a swing member provided to pivot the gas-liquid fluid, and a flow path cross-section reduction means provided at the flow path to reduce the cross-sectional area of the flow path at intervals such that the gas-liquid fluid flows over time from the opening plate. do.

According to a second aspect of the present invention, there is provided a gas-liquid supply apparatus for supplying gas to a liquid and supplying it as a gas-liquid fluid.

A tubular flow path through which the liquid and the gas-liquid fluid flow, a gas supply system connected to an upstream position of the flow path to apply the gas to the liquid, and a constant flow path to supply the liquid and the gas-liquid fluid. A pump provided in the position, an opening plate provided on the downstream side of any one of the upstream side positions or the predetermined position on the downstream side so as to rapidly change the cross-sectional area of the flow path, and the first pivoting in the first rotational direction. A stirring member in which a plurality of second turning blades turning in a direction opposite to the first turning direction and the first turning direction are alternately formed, and both ends of the second turning blades corresponding to both ends of the first turning blade are pivot members. The stirring member formed in the state which shifted phase on the phase, and provided in the said flow path of the downstream side of the said opening plate, and the said base plate from the said opening plate. Fluid is allowed to flow at a distance which takes time, is provided in the flow path characterized by having a flow path cross-section reduction means capable of reducing the cross-sectional area of the flow path.

In addition to the features of the invention of claim 1, the invention of claim 3 includes a plurality of alternating a plurality of first turning vanes turning in a first rotational direction and a plurality of second turning vanes turning in a direction opposite to the first rotational direction. As a member, both ends of the second swinging blades corresponding to both ends of the first swinging blade are formed in a state in which the phases are shifted on the swinging members, and have a stirring member provided in the flow path downstream of the opening plate. It is characterized by.

In addition to the features of the invention of any one of claims 1 to 3, the invention of claim 4 is characterized in that the opening plate is a porous plate having at least three holes.

The invention of claim 5 is characterized in that, in addition to the features of the invention of any one of claims 1 to 4, the flow path cross-sectional reduction means is a flow path cross-section adjusting means for changing the cross-sectional area.

In addition to the features of the invention of any one of claims 1 to 5, the invention of claim 6 is characterized in that the pump is a volumetric pump with little variation in flow rate with respect to pressure.

(Embodiment of invention)

Fig. 1 shows an example of the overall configuration of a gas-liquid supply device to which the present invention is applied, and Fig. 2 shows an example of the actual device structure downstream from the discharge pipe.

This apparatus is a device for supplying air, which is a gas-liquid fluid, to air mixed water and air-dissolved water by adding gas, which is liquid, to water, which is a tubular flow path through which water and gas-liquid fluid flow, and a discharge tube ( 2), the expansion pipe 3 and the supply pipe 4, the intake pipe 5 as a gas supply system, the intake air amount adjustment valve 6, the pump 7, the opening plate 8, the screw 9 as the pivot member, And a throttle valve 10 and the like which are flow path cross-section reduction means in this example.

The absorption tube 1 and the discharge tube 2 are the tubes of the diameter suitable for the capacity of the pump 7 normally. The water supplied to the absorption tube 1 is determined according to the use of the gas-liquid supplying device, and is, for example, the water of the lake when used to decompose and remove the dirty material of the lake. Since the suction pipe 5 is coupled to the absorption pipe 1, only water flows upstream of the coupling point A, and gas-liquid fluid flows downstream. The discharge tube 2 is also a tube having the same diameter as the discharge port of the pump 7 and is a tube for installing the opening plate 8 therebetween. However, it is also possible to mount the opening plate 8 directly to the pump 7, or to mount the opening plate 8 at the inlet of the expansion tube 3, as shown in FIG. Gas-liquid fluid flows through this tube.

The enlarged tube 3 is a tube having a larger diameter than the suction tube 1 and the discharge tube 2 so that the passage cross-sectional area can be suddenly changed by the opening plate 8 and the residence time when the gas-liquid fluid flows is obtained. It is preferable. The expansion pipe 3 is provided with a valve 3a for bleeding out as necessary for the purpose of initial adjustment. The valve 3a may be a float type automatic valve, manual cock, or the like. The reduction tube 4 is used for the purpose of further setting the residence time of the gas-liquid fluid, reducing the diameter, making it easier to tighten the throttle valve 9, or adjusting the flow of the gas-liquid fluid discharged as necessary. Is installed. However, it is also possible to shorten or omit this part sufficiently.

The intake pipe 5 is connected to the coupling point A of the absorption pipe 1 as described above in the upstream position of the flow path so as to apply air to the water. Inhale air in the open air. In this case, if the pump 7 is a fixed-capacity screw pump, the pump itself has a sufficient self-absorption capacity, and thus it is not necessary to additionally equip the vacuum pump or the like, and the device configuration is simplified. In addition, as shown by the dashed-dotted line in a figure, you may provide the blower 51 and to actively send air. As the intake air amount regulating valve 6, a mechanical side manual valve is usually used. However, it is also possible to use a remote manual valve or an automatic control valve if necessary.

The pump 7 is provided between the suction pipe 1 and the discharge pipe 2 as a fixed position of the flow path so that water and gas-liquid fluid can be supplied. The flow rate of the pump 7 is determined to suit the conditions of use of the apparatus. The discharge pressure is generally about 5 x 10 ⁵ Pa (0.5 Mpag) at the gauge pressure (the same as below), but at a high pressure when pumping water or when the pipeline to the place of use of the gas-liquid fluid is long. If necessary, a booster pump may be installed.

The pump 7 may be formed to be capable of stably delivering water at the above pressure, and a volumetric pump, a high head centrifugal pump, or the like is used. In particular, a volumetric pump with a small change in flow rate and direct change in pressure is preferable. Thus, as a pump, for example, as shown in FIG. 3, the synthetic rubber stator which forms the space of an elliptical cross-section with the screw of the cross-sectional circular rotor 71 which consists of a single screw of a single eccentric eccentric screw made of metal ( A specially designed rotary displacement monoaxial eccentric screw pump, which rotates within 72) to continuously feed gas-liquid fluids, is suitably used. Of course, other types of volumetric pumps, such as screw pumps and gear pumps of ordinary structure, may be used.

The opening plate 8 is located on the downstream side of the position of the pump 7 which is the position on the upstream side or the position of any downstream side of the intake position of the point A of the absorption pipe 1, which is a constant position. It is installed downstream of 7). By providing the opening plate 8 at such a position, the gas-liquid fluid can flow through the opening plate 8.

4 shows seven types of aperture plates used in the experiments described later. The opening plate 8 is provided with one or a plurality of holes 8a. As shown in the figure, the opening plate 8 is provided so as to rapidly change the cross-sectional area of the flow path and divide the water flow into a large number according to the numerical aperture. The size of the hole 8a is 1/20 to 1/10 of the enlarged pipe 3 in the orifice having one hole. The diameter of the hole 8a is about 1/5 to 1/3 of the discharge pipe 2. It is about the size. In a porous plate, it is set as opening area rate similar to this. Moreover, it is also possible to use the thing outside the said range. The number of holes 8a is determined by the conditions under which the apparatus is actually used. However, since the dissolved amount of gas varies depending on the number of holes as described below, when the amount of dissolved gas in raw water is small, For example, a perforated plate of seven holes is used. The number of holes 8a may be larger than this.

The screw 9 is provided so as to pivot the gas-liquid fluid in the discharge pipe 2 on the upstream side in the vicinity of the opening plate 8. As the screw 9, what cut | disconnected the screw of a screw conveyor by 1-2 pitches, for example can be used.

The throttle valve 10 is provided in the supply pipe 4 in this example which is a flow path at intervals such that the gas-liquid fluid flows over time in the opening plate 8, and the cross-sectional area of the flow path can be reduced and changed. do. Thereby, from this position, the pressure of the gas liquid fluid in the upstream part of the supply pipe 4 and the expansion pipe 3 can be maintained at the target pressure. In addition, for example, when the gas-liquid supply device is diverted to a specific facility for supplying air to a fish tank, the throttle state needs to be constant, so that a constant throttle mechanism such as an orifice is used instead of the throttle valve. Also good.

5 and 6 show another example of the gas-liquid supply device of the present invention. 5 shows the overall structure before and after the enlarged tube, and FIG. 6 shows the structure of a part of the stirring member.

In the apparatus of this example, the stirring member 11 is provided in the expansion tube 3 of the apparatus of FIG. The stirring member 11 is a right turning blade 12 and a first turning blade which rotate in a clockwise direction as seen from the left side (right side at the bottom) in the enlarged tube 3 at the upper end in the drawing in the first rotation direction. It is a member in which a plurality of left rotating blades 13 as second rotating blades that rotate in the counterclockwise direction opposite to the rotation direction of 1 are formed alternately. In addition, both ends 12a and 12b of the right turning wing 12 and both ends 13a and 13b of the left turning wing 13 are 180 ° in the upper and lower positions in the example seen from the circle AA position in the drawing, which is a turning member. It is formed in the state which shifted the phase.

These left and right rotary vanes 12 and 13 are divided in half pitches in this example and integrally formed with the bosses 14, and are assembled on the shaft 15, respectively. As the stirring member formed in this way, similarly to the screw 9, it is produced using the conveyor screw of the right rotation and the left rotation. Therefore, like the screw 9, it is inexpensive with an extremely simple structure. It goes without saying that such a stirring member can be manufactured by any other suitable method. The stirring member 11 is equipped with the gas-liquid supply apparatus of FIG. 1 as needed, and can be attached also to the apparatus which abbreviate | omitted the screw 9 in FIG. Moreover, it can also be provided in the supply pipe 4 with an expansion pipe instead of this. When installed in the discharge tube 4, the flow velocity of the gas-liquid fluid is increased, so that the resistance is increased, but the gas-liquid mixture is further promoted, so that the gas can be dissolved in the liquid even faster.

7 shows another example of the gas supply portion of the gas-liquid supply device.

In this example, instead of the intake pipe 5 of the apparatus of FIG. 1, the compressor 20 and the air pipe to send air to the B position of the discharge pipe 2 which is the discharge side of the pump 7 as the upstream position of the flow path. 21 is provided, and the intake air amount adjustment valve 6 is provided at the air intake end of the compressor 20. In addition, the air supply pipe 21 may be provided with a pressure regulating valve or a pressure reducing valve so as to make the air supply pressure constant. In this apparatus, only water flows through the absorption pipe 1, and the gas-liquid fluid flows from the position B or later, which is the connection point of the air supply pipe 21, without the air passing through the pump 7.

When the pressure of the compressor 20 or the pressure reducing valve is provided, the outlet pressure thereof is equal to the pressure of the pump 7. In addition, the intake air amount adjusting valve 6 may be provided on the discharge side of the compressor 20 as shown by the dashed-dotted line in the drawing to adjust the intake air amount by discharging the discharged air. According to such an intake system, the power ratio at the time of device cost and operation becomes rather high, but since the pump 7 sucks and discharges only water, cavitation does not occur in the pump at all, and the operation state is made more stable. can do. In addition, there is an effect of increasing the degree of freedom in selecting the type of pump 7 and the material of the water-receiving member.                     

The gas-liquid supply device as described above is designed to improve the water quality of the sea, lakes and swamps, reservoirs, rivers, etc., to remove suspended solids and oil from the plant drainage, and to supply air to fish tanks. It is widely applied to various applications by using the floating and oxygen supply of materials by water. The operation method and the effect of applying the device to the above applications will be described below.

This apparatus is, for example, in a closed water body such as a reservoir close to a dead state in which harmful phytoplankton, such as pollutants, organic matter, seaweeds, etc., floats or precipitates in the water or the water, and generates a unique smell. It is suitably used for regeneration. At this time, the apparatus is first installed in the vicinity of the reservoir, and the absorption pipe 1 is guided to the inside of the reservoir so that the water can be collected. In this case, a strainer such as a net is provided at the absorption end. In addition, the supply pipe 4 is guided to the required depth position of the reservoir. In the intake and drainage of such water, a flexible hose or the like suitable for the suction pipe 1 and the supply pipe 4 is connected.

While operating the pump 7 in this state, the opening degree of the intake air amount adjustment valve 6 and the throttle valve 10 is adjusted. As operation of this apparatus, since only this operation is satisfied, it becomes extremely simple and can be performed easily by a normal worker.

When the pump 7 is operated and the intake adjustment valve 6 and the throttle valve 9 are properly opened, the pump 7 inhales and discharges the quantity Q corresponding to the head, and together with the amount of air ( Inhale and discharge q). This air amount q is adjusted to an amount suitable for the amount of dissolved oxygen (hereinafter may be referred to as "Do") in the raw water sucked by the pump, the use of the gas-liquid fluid, or the like. That is, for example, when the Do value of the raw water is high, q is decreased. In addition, when producing the dissolved air-containing water in which the amount of air close to the solubility or the amount exceeding this is dissolved or mixed with micro bubbles, q required for it is increased. As described above, the amount of air supplied q varies depending on various conditions. For example, the amount of air supplied is added to the amount corresponding to the solubility of the atmosphere in water, so that the volume ratio is about 2% of Q. In addition, gas-liquid suction is performed without a problem by the sufficient self-sorption capacity of negative number m which the screw pump 7 has.

The sucked water and air become a gas-liquid fluid in a state of a relatively large mass of air and water, and are discharged from the pump 7 to reach the opening plate 8. Here, when the screw 9 is provided in the discharge pipe 2, the gas-liquid fluid turns to the opening plate 8 while turning. Then, water having a large specific gravity is collected on the outer circumferential side of the discharge pipe 2, and the air is collected in the center direction and continuously passes through the hole 8a in a uniformly stable state. As a result, the air in the gas-liquid fluid clumps upwards in front of the opening plate 8 of the discharge tube 2 to form a large mass, so that an unstable phenomenon such as intermittent inflow into the hole 8a does not occur. This makes the hole passage state stable, thereby facilitating the finer bubbles, and also preventing the occurrence of driving noise and vibration.

The degree of tightening of the throttle valve 9 varies depending on the purpose of use of the device, such as increasing Do or obtaining turbid water having a large air lift effect. The pressure in front of the spherical plate 8 is set to any pressure in the range of about 0.1 to 0.4 MPa. In addition, even when the pump 7 inhales and compresses air in this manner, if the pump 7 is a screw pump, a sudden pressure change does not occur in the pump. Cavitation such as erosion or vibration of the pump material does not occur. In centrifugal pumps and the like, a material having corrosion resistance on the blade is used as necessary.

The gas-liquid fluid which is sent to the pump 7 and the air flow is uniform by the screw 9 is compressed and flowed greatly in the holes 8a of the opening plate 8, and is classified according to the number of holes. It enters into the expansion tube 3 which has a larger diameter than the discharge tube 2 and expands rapidly. At this time, the bubbles in the gas-liquid fluid are finely divided at the end surface when passing through the opening plate, and deformed and separated by the reduced pressure expansion when the cross section is rapidly enlarged, and into the expansion tube 3 as the water flows. It diffuses and becomes a small bubble and exists uniformly.

The gas-liquid fluid in the expansion tube 3 is reduced in pressure by the opening plate 8, and then recovers the pressure. The throttle valve 9 maintains the pressure in the range of atmospheric pressure to about 0.3 MPag in accordance with the intended use. . As a result, it is possible to supply the adjusted gas-liquid fluid of air solubility corresponding to the pressure in accordance with the intended use. In addition, according to the position where the throttle valve 9 is provided in this way, a part of the expansion pipe 3 and the supply pipe 4 is maintained at this pressure, and only the residence time necessary for the gas-liquid fluid under pressure is allowed to flow.

As a result, a sufficient contact time between the air and water uniformly present throughout the water stream as a small bubble as described above is obtained, and the air is in a state of supersaturation which exceeds this to some extent from the degree of solubility of the pressure. Until dissolved in water.                     

When the stirring member 11 is provided in the expansion pipe 3, gas-liquid fluid is fully stirred by this, and the solubility of air becomes further larger. That is, as shown in FIG. 8, the gas-liquid fluid first enters the right turn blade 12 as shown by lines A ₁ and A ₂ on its front side and back face side, and then on the left turn blade 13. , Flows as shown by lines B ₁ and B ₂ , sorting, joining, classifying and inverting, joining, classifying, and inverting at locations near the illustrated points P ₁ , P ₂ , P ₃ , and P ₄ , respectively. do.

Moreover, the flow path is wider at the intermediate position of each blade near the point Q, and the flow path is narrow near the combination position of the left and right wings near the point Q ', and the flow is expanded and reduced. After that, the same flow condition is repeated to become extremely turbulent, so that the liquid-liquid fluid is sufficiently stirred, the bubbles are deformed and partly contacted, and the surface area in contact with water is further enlarged, and the air is dissolved into the water. .

In addition, as a device for stirring the fluid in the pipeline, a special mixer that stirs the fluid by arranging the plate-shaped body 180 ° twisted element in the pipe so that both ends intersect, and repeats the dividing and reversal of the flow is well known In this apparatus, since the turbulent state of the fluid is insufficient, the degree of dissolution of the gas into the liquid is not largely improved.

When it is necessary to change the solubility of air during operation, the discharge pressure of the pump 7 is changed. At this time, if the pump 7 is a constant volume screw pump, the discharge amount of the pump can be maintained at a small fluctuation amount of up to about 20%. As a result, the gas-liquid ratio can be maintained in the allowable range even when the intake air amount adjustment valve 6 adjusted once is operated in the state as it is. Moreover, even when this valve is readjusted, the adjustment is easy.

Moreover, in this invention, since the container part which melt | dissolves air with water is comprised in the tubular thing with flows, such as the expansion pipe 3, it becomes the gas-liquid two-layer state in which air was completely separated from water like the case of using a tank. There is no work. Air is present in the tube in the form of particles, and the contact area between air and water is large. As a result, air is easy to dissolve in water, and the gas-liquid fluid can be quickly reached high solubility.

The gas-liquid fluid which has the air dissolved in water and the air mixed into microbubbles as needed and mixed uniformly is sent out from the throttle valve 9 to the supply pipe 4, and discharged to the place aimed for a reservoir. . In this case, when the gas-liquid fluid comes out of the throttle valve 9, the pressure drops to atmospheric pressure, so that the supersaturated portion of the dissolved air is formed into micro bubbles. That is, the amount of air dissolved in water decreases and the microbubbles in the mixed state increase. Since such microbubbles are generated from air that has been dissolved, they exist extremely uniformly in water.

In the case of purifying the reservoir, etc., the first step of removing the harmful to-be-processed object mainly uses the air lift action of the gas-liquid supply device, and the second step of reactivating the natural purification action of the reservoir is performed by the oxygen supply action by air. I use it. Therefore, in the first step, the amount of air supplied to the intake air amount adjustment valve 6 is increased, and the pressure in the pipe is increased by the throttle valve 9. As a result, the amount of air dissolved in the enlarged tube 3 is increased, and after exiting the throttle valve 9, the amount of mixed air as a micro bubble uniformly present can be increased. As a result, when this gas-liquid fluid is ejected from a location of a suitable depth in the water of the reservoir, a large amount of microbubbles uniformly present are formed of contaminants present in the water, harmful phytoplankton such as organic matter and seaweeds, and the like. It adheres to a to-be-processed object, and it can catch and float them satisfactorily without leaking them by air lift action. In this way, the to-be-processed object which floats and accumulates in the water phase is easily removed from the reservoir by, for example, a vacuum apparatus.

When the removal of the object is finished, the oxygen supply action by air of the gas-liquid supply device is used. That is, the amount of air supplied to the intake air amount adjustment valve 6 is made small and the pressure clamped by the throttle valve 9 is made low. As a result, the mixing amount and the dissolution amount of the microbubbles are reduced in the portion of the expansion tube 3, but after exiting the throttle valve 9, most of the sucked air is kept in the dissolved air state and the mixed micro Bubbles are small and have small dimensions. As a result, when this gas-liquid fluid is ejected from the bottom of the reservoir, the water containing the dissolved air is present in the water bottom for a long time without the microbubbles of small and small dimensions acting as an air lift. Dissolved oxygen is given to water and useful microorganisms to activate the condition of the water surface. By continuing such operation with respect to the whole reservoir, the natural purification action can be restored, the odor emission, etc. can be completely eliminated, and the reservoir can be regenerated in a clean state.

In addition, in the above, the example which applied this apparatus to reservoir regeneration was demonstrated, This apparatus is used for various uses which use an air lift action and an oxygen supply action. Moreover, since this apparatus has the oxygen supply function which is more reliable and more efficient than an air bubbling apparatus, it is applicable suitably also to the breeding tank of fish and shellfish.

The present inventors conducted various experiments as follows using the gas-liquid supply apparatus as mentioned above.

[Experiment 1: Observation of Air Dissolved State]

The apparatus of the structure shown in FIG. 1 and FIG. 2 which has the following specifications was tested and the mixed dissolution test of the air in the gas-liquid fluid discharged in water was done, and the result of Table 1 was obtained.

[Device specification]

Rated flow rate x discharge pressure of the pump; 11㎥ / h × 0.6Mpa

Inlet / outlet pipe diameter; 80 mm

Diameter of supply pipe; 40 mm

Diameter of the expansion tube x length; 300mm X approximately 1.5m

Hole diameter of orifice as opening plate; 25.5 mm

[Experimental Results]-Table 1                     

In Table 1, the degree of "cloudiness" of the bubble state at the time of the water discharge is as shown in Figs. 9 to 12 with respect to the experimental states (1), (3), (5) and (7). The air dissolved once is supersaturated by opening to the atmosphere from the hose 4a connected to the discharge pipe 4, which means that the supersaturated powder is in a milky white mixed state as shown in the figure. In addition, in experimental state (1), (2), the air clumped above the expansion pipe 3, and the quantity was not stabilized, and it operated by opening the air vent valve 3a a little and bleeding air. .

According to this experiment, by adjusting the amount of air supplied by the air volume control valve and by adjusting the melt pressure of the air by the throttle valve, the amount and particle size of the mixed bubbles are added and subtracted, and the air lift action and the oxygen supply action are optionally selected. It became clear that

[Experiment 2; Confirmation of the effect of the presence of a screw]

In the apparatus of Experiment 1, the opening plate 8 was made into a porous plate having seven holes having a total area of 309.3 mm ² with a diameter of 7.5 mm, and the case where the screw 9 was mounted in front of the porous plate and when it was removed. An experiment was carried out and the results of Table 2 were obtained. The Do value of jetting water sampled the gas-liquid fluid after exiting the throttle valve 10, and measured it with the Do meter.

[Experimental Results]-Table 2

According to this experiment, as a value corresponding to the air dissolution performance, the difference in Do value or solubility difference between the river water, which is the raw water sucked by the pump, and the water discharge after treatment with the device of the present example, 1.9 is 2.2 in 10 minutes after the air injection. Up to about 16%, up to 25.2% up to 28.4%, up to about 13%, even in 20 minutes after air injection, up to about 2.2% up to 2.4, up 29.2% up to 31.4%, up about 7.6% It was confirmed that the air dissolution characteristics were considerably good when equipped with. In addition, according to the visual inspection, bubbles were irregularly infiltrated into the opening plate before the screw was mounted, but after the screw was mounted, the particles were constantly in a good state, and therefore, a better effect than the above experimental value is expected to be obtained.

[Experiment 3; Confirmation of Effect of Stirring Member]

In the apparatus of Experiment 2, a comparative experiment was conducted with and without the screw 9, and the case where the stirring member 11 shown in Figs. .

[Experimental Results]-Table 3                     

According to this experiment, as a value corresponding to the air dissolution performance, the difference or Do solubility difference between the Do water of the river water, which is raw water sucked by the pump, and the water discharge after treatment with the apparatus of this example is the average value of 2 data at 10 minutes after the air injection. In comparison with, 1.3 increased by about 50% to 1.95, and 17.5% increased by about 52% to 26.6%, and even in 20 minutes after air injection, 1.25 rose by about 80% to 2.25, and 16.7% increased by 30.7%. It was up to about 84%, and when equipped with a stirring member 11, it was confirmed that the air dissolution characteristics were particularly good.

[Experiment 4; Confirmation of effect of hole number of opening plate]

In the screw attaching apparatus of Experiment 2, comparative experiments were carried out by sequentially changing the holes 8a of the opening plate 8 from one to seven shown in FIG. 4, and the effects of Table 4 were obtained.

[Experimental Results]-Table 4

According to this experiment, it became clear from the numerical values of the Do difference and the solubility difference that the effect of increasing the number of holes was more than three, and that the effect was more effective at seven or more.

As described above, according to the present invention, in the invention of claim 1, since the gas-liquid supply device is mainly composed of a tubular flow path through which liquid and gas-liquid fluid flow, the structure of the entire apparatus is simplified and the gas-liquid fluid is always Since it is in a flow state, it always maintains the small bubbles of the gas uniformly dispersed in water in such a state without expanding the liquid phase and the gas phase like a tank, expands the gas-liquid contact area, and accelerates the dissolution rate of the gas into the liquid. can do. In addition, since the gas supply system is connected to the upstream position of the flow path so as to apply gas to the liquid, the gas to be dissolved and mixed can be supplied.

Moreover, since the pump which can supply a liquid and a gas-liquid fluid is provided, it can make it possible to blow in gas, to supply into these flow paths, and to supply to the intended use place. Furthermore, since the opening plate is provided so as to rapidly change the cross-sectional area of the flow path at a predetermined position on the downstream side, the gas is finely cut and separated in the process of expanding from the reduction of the flow-path cross-sectional area, and uniformly dispersed in the liquid as small bubbles according to the flow of the liquid. Can be. As a result, the dissolution reaction of the gas into the liquid can be promoted. In this case, since the pivot member which turns the gas-liquid fluid from the vicinity of the opening plate to the upstream side is provided, when a liquid having a large specific gravity is collected on the outer circumferential side and gas is collected at the center side, the gas-liquid fluid is introduced into the opening plate. By stabilizing the passage state of the gas, it is possible to more completely prevent the uniform granulation of bubbles and the generation of noise and vibration during operation.

Furthermore, since the flow path cross-sectional reduction means are provided at intervals so that the gas-liquid fluid flows over time, the gas present as a uniformly dispersed small bubble is pressurized to increase the pressure, and the solubility of the gas is increased to dissolve many gases. At the same time, the gas remaining in the mixed state can be dispersed more uniformly. In addition, by allowing time to flow, the gas-liquid fluid can be reliably attained substantially solubility. In this case, even if time is taken, in the present invention, since the optimum conditions for gas-liquid contact are provided as described above, many gases can be dissolved in the liquid more quickly.

As described above, the invention of claim 1 has a low cost that is easy to operate with a simple configuration by adopting a tubular flow path structure, a pump, a pivoting member, a flow path section rapid variable step, and a flow path section reduction means. Under the device, it is possible to quickly supply a gas-liquid fluid which can optionally achieve either the action of air lift or oxygen supply.

In the invention of claim 2, since a stirring member is formed in a state in which a plurality of first turning vanes and second turning vanes whose rotation directions are opposite to each other are alternately phased on the pivot members in a flow path downstream of the opening plate, The solubility can be greatly improved in the liquid of the gas together with or instead of the swinging member of the invention of claim 1. That is, since both ends of the first and second turning blades are formed out of phase, when the gas-liquid fluid moves between them, the flow direction is reversed, and the flow rate changes by dividing, merging and expanding the flow path. And the gas becomes extremely turbulent, the gas-liquid fluid is sufficiently agitated, the bubbles are deformed and broken, and the surface area in contact with the water is further enlarged, and the dissolution of air into the water is greatly promoted. Such a large acceleration effect of gas solubility cannot be obtained with a conventional fluid mixer.

The invention of claim 3 combines the effects of the invention of claims 1 and 2.

In the invention of claim 4, since the opening plate is a porous plate having at least three holes, in addition to the effect of the invention of claims 1 to 3, gas-liquid solubility can be further improved. In other words, when the number of holes of the opening plate is three or more, the gas-liquid distribution becomes good and the gas-liquid solubility is improved by the effect of dividing the gas-liquid fluid and uniformizing the flow state after exiting the hole. do.

In the invention of claim 5, since the flow path cross-sectional reduction means is a flow path cross-section adjusting means for changing the cross-sectional area, it is possible to adjust the particle size of the bubbles more easily. As a result, the production of the gas-liquid fluid corresponding to the intended use can be further facilitated.

In the invention of claim 6, in the above invention, the pump is a volumetric pump with a small fluctuation in flow rate with respect to pressure. Therefore, if the gas supply amount is adjusted to a certain amount, the gas-liquid ratio of the gas-liquid fluid to be supplied can always be approximately constant. have. The particle size of the gas present in the gas-liquid fluid in the mixed state becomes larger and smaller when the supply gas is large, and when the amount is equivalent to the solubility, the mixed gas in the particulate state becomes extremely micronized and hardly exists. Since a constant volume pump can maintain the gas-liquid ratio at a constant value for the purpose, by adjusting this value, the size of the bubbles in the mixed state in the gas-liquid fluid can be adjusted to the desired size. As a result, for example, the air lift effect is increased by increasing the number of large micro bubbles to some extent, or the oxygen supply effect to the water floor is increased by making the air near or slightly supersaturated. You can make the right gaseous fluid.

Moreover, since the fixed volume pump itself has a large self-absorption capacity, it does not need to be a self-suction pump with a vacuum pump or the like, and the structure is simple and the operation is simple. Moreover, even if there is no booster machine such as a compressor, the gas can be supplied by suctioning from the suction side of the pump, so that the device configuration can be made simple and low cost.

Claims (6)

In the gas-liquid supply device which adds gas to liquid and supplies it as a gas-liquid fluid, A tubular flow path through which the liquid and the gas-liquid fluid flow, a gas supply system connected to an upstream position of the flow path to apply the gas to the liquid, and a constant flow path to supply the liquid and the gas-liquid fluid. A pump provided at a position, an opening plate provided on the downstream side of any one of the upstream side positions or the predetermined position so as to rapidly change the cross-sectional area of the flow path, and the gas-liquid solution from the vicinity of the opening plate to the upstream side. A gas-liquid supply comprising: a pivot member provided to pivot the fluid; and a flow path cross-sectional reduction means provided in the flow path at intervals such that the gas-liquid fluid flows over time from the opening plate, thereby reducing the cross-sectional area of the flow path. Device. In the gas-liquid supply device which adds gas to liquid and supplies it as a gas-liquid fluid, A tubular flow path through which the liquid and the gas-liquid fluid flow, a gas supply system connected to an upstream position of the flow path to apply the gas to the liquid, and a constant flow path to supply the liquid and the gas-liquid fluid. A pump provided in the position, an opening plate provided on the downstream side of any one of the upstream side positions or the predetermined position on the downstream side so as to rapidly change the cross-sectional area of the flow path, and the first pivoting in the first rotational direction. A stirring member in which a plurality of second turning blades turning in a direction opposite to the first turning direction and the first rotation direction are formed alternately, and both ends of the second turning blades corresponding to both ends of the first turning blade are pivot members. The stirring member formed in the state which shifted phase on the phase, and provided in the said flow path of the downstream side of the said opening plate, and the said base plate from the said opening plate. A gas-liquid supplying device, characterized in that it has flow path cross-section reduction means provided in said flow path at intervals so that a liquid fluid flows over time, and can reduce the cross-sectional area of this flow path. 2. A stirring member according to claim 1, wherein a plurality of first turning vanes turning in a first rotational direction and second turning vanes turning in a direction opposite to the first rotational direction are formed as a plurality of stirring members. A gas-liquid supply device, characterized in that both ends of the second turning blade corresponding to both ends are formed in a state in which the phases are shifted on the turning member, and have a stirring member provided in the flow path on the downstream side of the opening plate. The gas-liquid supply device according to any one of claims 1 to 3, wherein the opening plate is a porous plate having at least three holes. The gas-liquid supply device according to any one of claims 1 to 3, wherein the flow path cross-sectional reduction means is a flow path cross-section adjusting means for changing the cross-sectional area. The gas-liquid supply device according to any one of claims 1 to 3, wherein the pump is a volumetric pump having a small variation in flow rate with respect to pressure.

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