WO2023162183A1 - Gas replacement device - Google Patents

Abstract

Flow rectifying plates 4a are tilted downward toward a first direction side, and flow rectifying plates 4b are tilted downward toward a second direction side that is opposite from the first direction. These flow rectifying plates 4a, 4b are vertically arranged in an alternating manner, and thus polluted water that flows down the rectifying plates 4a, 4b meanders while flowing downward toward a bottom section of a vessel 3. Consequently, in comparison to previous technologies in which polluted water is made to flow downward in a helical manner around a ventilation passage, resistance to the downward flow of the polluted water is not readily produced, and additionally, retention within the vessel 3 of polluted sludge (sludge) that is included in the polluted water can be suppressed. The flow rate of the polluted water can therefore be increased, and thus the processing capability of a gas replacement device 1 can be increased.

Description

Gas replacement device

The present invention relates to a gas replacement device, and more particularly to a gas replacement device capable of improving processing capacity.

Water is a compound of hydrogen and oxygen, and two hydrogen atoms and one oxygen atom form a water molecule by combining electrons. The bond angle between the oxygen atom and the hydrogen atom is 104.5 degrees, and the electrons of the hydrogen atom are heavier (larger in electronegativity) than the hydrogen atom, so the hydrogen atom side is positive. , the oxygen atom side is negatively charged. As a result, water molecules have a weak positive and negative electric attraction (dipole moment). Due to this electric attraction, when water is in a liquid state, it is thought that water molecules bind to each other in the form of hydrogen bonds to form clusters.

This cluster is predicted to be an assembly of 5-6 water molecules or a structure of 15-20 water molecules. In the state of forming clusters, one water molecule is considered to have a regular tetrahedral structure in contact with four water molecules, that is, a structure with large gaps close to the molecular structure of ice. For this reason, water has gaps in about 62% of its volume, and it is considered that "a state in which gas is dissolved in water" is formed by enclosing gas in these gaps.

This can also be explained from the fact that the saturated dissolved oxygen amount increases as the water temperature decreases, as shown in "Table 32.1 Saturated dissolved oxygen amount in water (1013 hPa)" of JIS K0102 (2016 version). That is, when the water temperature drops, the molecular structure of water approaches the molecular structure of ice (regular tetrahedral structure with large gaps), and the gas contracts due to the drop in water temperature. For this reason, as the water temperature approaches 0° C., it is believed that more gas is likely to be included in the gaps in the water, increasing the saturated dissolved oxygen amount.

As a technology related to gas dissolution in water, there is an aeration method that sends air into water. Aeration is a technique aimed at dissolving oxygen in water by air being forced into the water.

A common aeration method is aeration in fish tanks, and as is well known, the existence of air bubbles floating in the water can be confirmed in this aeration. The presence of air bubbles clearly indicates that most of the air bubbles (gases) are not dissolved in the water. In addition, as a recent technology of the aeration method, the use of nanobubbles has been attracting attention. Very little.

In other words, these aeration methods simply pass air through water, and it is difficult to dissolve a large amount of oxygen in water. It is considered that this is because the gas contained in the gaps of the water and the air supplied to the water have almost the same pressure, and it is difficult for these gases to be replaced.

The aeration tank for wastewater treatment is designed with this kind of pressure in mind. For example, an aeration tank using the activated sludge method is generally designed to have a depth of about 3 to 5 m. It is thought that the reason for designing for such a deep water depth is that we have learned from experience that air (oxygen) can be efficiently dissolved in water by using the pressure (water pressure) at that depth. The water pressure at the water depth of 3 to 5 m is 0.03 to 0.05 MPa.

Based on the above findings by the inventor of the present application, Michio Morita, the applicant of the present application has already developed a gas replacement device that utilizes a completely opposite idea from the aeration method described above (for example, Patent Document 1, etc.). This gas replacement device pressurizes the inside of the container above the atmospheric pressure by filling the container with a gas (for example, oxygen) to be dissolved, and allows water to pass through the pressurized container.

In this gas replacement device, the gas contracts due to pressurization (Henry's law), making it easier for water to enter the gaps. The pressure of the gas inside the container is higher than the pressure of the gas inside the container. Therefore, when the water comes into contact with the gas in the container, the gas (e.g., nitrogen) originally included in the gaps of the water is instantly replaced with the gas (e.g., oxygen) filled in the container. .

The gas released from the gaps in the water due to this replacement is discharged out of the container through the ventilation channel in order to reduce the purity of the gas in the container (the concentration of the gas intended for dissolution). This makes it possible to maintain the purity of the gas in the container, and to generate gas-dissolved water in which the gas in the container is dissolved at a high concentration.

In this way, by pressurizing the inside of the container above the atmospheric pressure, the same effect as deepening the water depth (using water pressure) as in the above aeration tank can be obtained. That is, for example, by pressurizing the inside of the container of the gas replacement device with oxygen by 0.03 to 0.05 MPa higher than the atmospheric pressure, it is possible to reproduce the water depth pressure of 3 to 5 m. Both (for example, even in shallow water of less than 3 m) enable the dissolution of the necessary dissolved oxygen.

In addition, the gas-dissolved water produced by the above-mentioned gas replacement device is in a state close to no bubbles (non-bubbles), and unlike the conventional aeration method in which the presence of bubbles can be confirmed, the target gas is almost completely removed (100 %) becomes dissolved. The dissolution capacity of this gas replacement device is considered to be nearly 100 times as high as that of the conventional aeration system. Now, we will examine the specific concentration of the state in which the gas is almost completely dissolved based on the above theory of gaps in water.

As shown in the JIS standard above, the saturated dissolved oxygen content of water under atmospheric pressure (in the natural world) is 14.62 ppm when the water temperature is 0°C. ”. The composition of air (atmosphere) is 78.08% nitrogen, 20.95% oxygen, 0.93% argon, and other gases. Therefore, when all the air dissolved in the water under the atmospheric pressure (natural world) is replaced with oxygen, that is, the amount of oxygen included in the gaps in the water changes from 20.95% to 100%. In this case, the amount of dissolved oxygen in water is 14.62 ppm×(100/20.95)%=about 69.8 ppm.

It has been confirmed that when oxygen-dissolved water is generated by the above gas replacement device, the amount of dissolved oxygen is about the same as the above approximately 69.8 ppm. High-concentration oxygen-dissolved water, for example, activates microorganisms in water, and is therefore suitable for improving the environment of polluted water areas (rivers, lakes, aquaculture farms, etc.).

In the case of such environmental improvement, oxygen is dissolved in the water sucked up from the polluted bottom of the water by the above gas replacement device and returned to the bottom of the water. As a result, the high-concentration oxygen-dissolved water stays at the bottom of the water, so that the amount of dissolved oxygen at the bottom of the water can be increased. Since aerobic microorganisms at the bottom of the water are activated by an increase in the amount of dissolved oxygen, elution of nutrients from sludge at the bottom of the water into the water can be suppressed, and offensive odors caused by the generation (rottenness) of blue-green algae can be suppressed. That is, the abundant dissolved oxygen at the bottom of the water promotes the activity of microorganisms in the water, and organic contaminants are absorbed from the microorganisms to protozoa and the like, and then to fish and the like, thereby improving the environment.

It is impossible to improve the amount of dissolved oxygen at the bottom of the water with the aeration method described above. This is because, as described above, in the aeration method, air bubbles (oxygen) float to the surface without remaining at the bottom of the water, and the amount of oxygen dissolved in water is small in the first place. Furthermore, for example, when pure oxygen is supplied into water by an aeration method, microorganisms in direct contact with air bubbles (pure oxygen) may be adversely affected. On the other hand, the oxygen-dissolved water produced by the above gas replacement device is in a state close to bubble-free (that is, oxygen is included in the water, and oxygen is difficult to come into direct contact with microorganisms), and has an adverse effect on microorganisms. Nor.

Another advantage of being bubble-free is that it can safely dissolve ozone gas. That is, since the ozone-dissolved water generated by the above gas replacement device is bubble-free, it can be used safely with very little release of dangerous ozone gas into the atmosphere. This ozone-dissolved water can be used, for example, for wastewater treatment.

In addition to ozone, the above gas replacement device can dissolve various gases such as nitrogen, carbon dioxide, hydrogen, and argon in water. It is possible to generate gas-dissolved water for various applications.
For example, oxygen-depleted water can be produced by dissolving nitrogen in water at a concentration close to 100%. Oxygen-removed water has the advantage that it does not rust even when metals such as iron come into contact with it, and the advantage that fish are less likely to rot (easier to maintain freshness) if they are preserved in ice obtained by freezing the oxygen-removed water. In addition, if water in which carbon dioxide is dissolved is given to plants such as algae and crops, photosynthesis can be promoted, and thus the growth of plants is promoted.

Furthermore, the gas replacement device described above can also generate microbubbles by adjusting the pressure of the gas in the container. When generating microbubbles, the inside of the container is pressurized at a pressure higher than the pressure at which the gas dissolves 100% in water, and the gas is dissolved in supersaturated water to produce gas-dissolved water. When the gas-dissolved water in which the gas is supersaturated and dissolved is released to the outside, fine bubbles (micro or nanobubbles) are generated from the gas-dissolved water due to the pressure difference when returning from the pressurized state to the atmospheric pressure. This microbubble can be used, for example, in the pressurized flotation method. Since the generation of microbubbles by the above-described gas replacement device can be achieved by simply discharging the gas-dissolved water out of the container, special devices such as providing a nozzle for generating microbubbles at the discharge port, for example, can be used. No equipment required.

WO 2017/191678 (for example, paragraphs 0056-0058, Figure 1)

However, in the above-described conventional technology, the treated water spirally flows down the rectifying plate provided around the ventilation path in the container. easily occur. In addition, for example, when the treated water is contaminated water, if the flow path is complicated as described above, the sludge contained in the contaminated water tends to stay in the container, and the accumulation of this sludge also hinders the flow of treated water. do. In other words, the conventional technique described above has a problem that it is difficult to increase the flow rate of the treated water, and the processing capacity of the gas replacement device cannot be sufficiently improved.

The present invention has been made to solve the above-mentioned problems, and aims to provide a gas replacement device capable of improving the processing capacity.

To achieve this object, the gas replacement apparatus of the present invention comprises gas supply means for supplying gas, and a cylindrical container whose interior is pressurized to a pressure higher than the atmospheric pressure by the gas supplied from the gas supply means. , a plurality of rectifying plates fixed inside the container, and a treated water supply means for taking in the treated water flowed down by the plurality of rectifying plates from a water source and supplying the treated water to the container, and dissolving in the treated water The rectifying plate includes a first rectifying plate inclined downward toward the first direction and a a second flow straightening vane inclined downward toward the second direction side, the first straightening vanes and the second straightening vanes are arranged alternately in the vertical direction, and the treated water flows through the first straightening vanes and the second straightening vanes; It flows down while meandering through the second rectifying plate.

According to the gas replacement device of claim 1, the straightening plate includes the first straightening plate inclined downward in the first direction and the straightening plate downwardly inclined in the second direction opposite to the first straightening plate. Since the first straightening vanes and the second straightening vanes are arranged alternately in the vertical direction, the treated water flows down while meandering through the first straightening vanes and the second straightening vanes. . Compared to the conventional technology in which the treated water flows down spirally around the ventilation path, such a flow path of the treated water makes it difficult for the treated water to flow down. In some cases, it becomes difficult for sludge to stay in the container. Therefore, since the flow rate of the treated water can be increased, there is an effect that the processing capacity of the gas replacement device can be improved.

According to the gas replacement device of claim 2, in addition to the effects of the gas replacement device of claim 1, the following effects are achieved. Since the protrusions or recesses are formed at the downstream ends of the first straightening plate and the second straightening plate, the surface area of the treated water flowing down the protrusions or recesses can be increased. As a result, the contact area between the gas in the container and the treated water can be increased, so that the gas dissolved in the treated water can be efficiently replaced with the gas in the container (gas supplied from the gas supply means). be.

According to the gas replacement device of claim 3, in addition to the effects of the gas replacement device of claim 2, the following effects are achieved. Since the concave portion of the shape along the convex portion of the first straightening plate is formed in the second straightening plate, by cutting the plate along the convex portion of the first straightening plate (the concave portion of the second straightening plate), the second straightening plate can be cut. The protrusions and recesses of the first straightening plate and the second straightening plate can be formed at the same time. Therefore, there is an effect that the number of man-hours for molding the first rectifying plate and the second rectifying plate can be reduced.

According to the gas replacement device of claim 4, in addition to the effects of the gas replacement device of claim 3, the following effects are achieved. When the first straightening plate and the second straightening plate are butted against each other so that the convex portion is fitted in the concave portion, the outer edges of the first straightening plate and the second straightening plate become circular. As a result, by cutting one disk along the shape of the projections (recesses), the first straightening plate and the second straightening plate having the projections and recesses can be formed at the same time. As a result, there is an effect that the material cost of the first rectifying plate and the second rectifying plate can be reduced.

According to the gas replacement device of claim 5, in addition to the effects of the gas replacement device of claim 4, the following effects are achieved. Since the inclination angle of the first straightening vanes and the second straightening vanes with respect to the plane perpendicular to the axial direction of the container is 5° or less, the semicircular outer edges of the inclined first straightening vanes and the second straightening vanes and the cylindrical shape It is possible to suppress the occurrence of an excessive gap between the container and the inner peripheral surface of the container. Thereby, there is an effect that the outer edge of each rectifying plate and the inner peripheral surface of the container can be properly joined.

According to the gas replacement device according to claim 6, in addition to the effects of the gas replacement device according to any one of claims 1 to 5, the following effects are achieved. Since the drainage port for discharging the treated water to the outside of the container is formed on the bottom inside the container, for example, when the treated water is polluted water, the sludge contained in the polluted water flows toward the drainage port. becomes easier. As a result, it is possible to suppress the sludge from remaining in the container, and the flow rate of the treated water can be increased, so that there is an effect that the treatment capacity of the gas replacement device can be improved.

According to the gas replacement device of claim 7, in addition to the effects of the gas replacement device of claim 6, the following effects are achieved. Since the bottom surface inside the container is inclined downward from the inner peripheral surface side of the container toward the drain port side, the sludge that has flowed down to the bottom surface side inside the container easily flows toward the drain port. As a result, it is possible to suppress the sludge from remaining on the bottom surface of the container, and the flow rate of the treated water can be increased, so that there is an effect that the treatment capacity of the gas replacement device can be improved.

According to the gas replacement device of claim 8, in addition to the effects of the gas replacement device of claim 6 or 7, the following effects are achieved. The drain pipes connected to the drain port comprise a first drain pipe for returning treated water to the water source and a second drain pipe for draining the treated water to a location different from the water source. Accordingly, by adjusting the flow rate of the treated water (gas-dissolved water) discharged from the second drain pipe, it is possible to easily adjust the amount of treated water returned to the water source from the first drain pipe.

According to the gas replacement device of claim 9, in addition to the effects of the gas replacement device of any one of claims 1 to 8, the following effects are achieved. The container comprises a container body whose upper end side is open, a cylindrical body configured to be insertable from the upper end of the container body and fixed to the inner peripheral side of the container body, and the container body and the cylindrical body closing the upper end sides. A lid body is provided, and the first rectifying plate and the second rectifying plate are fixed to the inner peripheral surface of the cylindrical body. Thus, after inserting and fixing the cylindrical body to which the first straightening vanes and the second straightening vanes are fixed into the container main body, the upper end sides of the container main body and the tubular body are closed with the lid, whereby the first straightening vanes and the second straightening vanes are closed. A second baffle can be arranged inside the container.

That is, the first rectifying plate and the second rectifying plate can be fixed in advance (before being inserted into the container body) to a cylinder whose vertical dimension is smaller than that of the container body. As a result, compared with the case where the first straightening vane and the second straightening vane are fixed to the container body, for example, there is an effect that the workability of the fixing work can be improved.

According to the gas replacement device of claim 10, in addition to the effects of the gas replacement device of claim 9, the following effects are obtained. The cylindrical body has a flange projecting radially outward from its upper end side, and the outer diameter of the flange is larger than the inner diameter of the container body. It can be hung on the body. Thereby, the upper end sides of the container body and the cylinder can be closed with the lid while the relative position of the cylinder with respect to the container body is determined. Therefore, there is an effect that the workability of attaching the lid can be improved.

1 is a cross-sectional view of a gas replacement device in one embodiment of the present invention; FIG. (a) is a top view of a rectifying plate, and (b) is a top view of a disc that is a material of the rectifying plate. (a) is a cross-sectional view of a cylindrical body showing a state in which straightening plates are welded, and (b) is a partially enlarged cross-sectional view of the gas replacement device showing how a container is assembled.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. First, the configuration of the gas replacement device 1 will be described with reference to FIG. FIG. 1 is a cross-sectional view of a gas replacement device 1 according to one embodiment of the present invention. In addition, FIG. 1 shows a cross section taken along a plane including the axis of the cylindrical container 3 .

As shown in FIG. 1, the gas replacement device 1 replaces gas (for example, nitrogen) originally dissolved in polluted water taken from a water area (water source) to be purified, such as a river or lake, with oxygen. It is a device for returning oxygen-dissolved water in which is dissolved in a high concentration to the water area to be purified. By returning the oxygen-dissolved water to the water area to be purified, the amount of dissolved oxygen (DO) in the water area to be purified increases, and microorganisms in the water area to be purified are activated. As a result, the decomposition of organic matter in the water area to be purified is promoted, and the water quality of the water area to be purified is improved.

The gas replacement device 1 is equipped with a water intake pipe 2 for taking in polluted water from the water area to be purified, and the polluted water taken in by this water intake pipe 2 is supplied to the inside of the container 3 . The water intake pipe 2 is connected to a pump (not shown) for sucking up polluted water from the water area to be purified. It constitutes a supply means.

The container 3 includes a cylindrical container body 30 to which the water intake pipe 2 is connected on the side surface, a cylindrical body 31 inserted into the inner peripheral side of the container body 30, and a lid body 32 covering the upper part of the cylindrical body 31. Prepare.

A plurality of rectifying plates 4a and 4b are fixed to the inner peripheral surface of the cylindrical body 31, and the polluted water supplied from the water intake pipe 2 is rectified by these rectifying plates 4a and 4b and flows to the bottom of the container body 30. flow down toward A supply pipe 5 for supplying oxygen to the inside of the container 3 is connected to the lid 32 , and a compressor (not shown) for filling the container 3 with oxygen is connected to the supply pipe 5 . The supply pipe 5 and the compressor constitute gas supply means for supplying oxygen to the container 3 .

Since the inside of the container 3 is pressurized to a pressure slightly higher than the atmospheric pressure (for example, 0.01 to 0.1 MPa higher) by oxygen supplied from the supply pipe 5, the gas dissolved in the polluted water (For example, nitrogen) is replaced with oxygen when the polluted water flows down the rectifying plates 4a and 4b. As a result, oxygen-dissolved water in which oxygen is dissolved at a high concentration is obtained.

A plurality of straightening plates 4a and 4b (in this embodiment, two each) are arranged side by side in the vertical direction (vertical direction). Contaminated water from the water intake pipe 2 flows into the current plate 4a.

The straightening plate 4a is inclined downward toward the right side (first direction side) in FIG. 1, while the straightening plate 4b is inclined downward toward the left side (second direction side). The upper surfaces of the straightening plates 4a and 4b are flat, and the straightening plates 4a and 4b are alternately arranged vertically. Therefore, the polluted water flowing down the rectifying plates 4a and 4b meanders down toward the bottom of the container 3 (see flow path A). As a result, compared to the conventional technology in which the polluted water spirals down around the ventilation path, resistance against the polluted water flowing down is less likely to occur, and the sludge contained in the polluted water stays inside the container 3. can be suppressed. Therefore, the flow rate of polluted water can be increased, and the processing capacity of the gas replacement device 1 can be improved.

When the gas dissolved in the polluted water is replaced with oxygen, the gas originally dissolved in the polluted water (for example, nitrogen) is released inside the container 3 . An exhaust pipe 6 for exhausting the released gas is connected to the lid 32 of the container 3 . Exhaust from the exhaust pipe 6 can be controlled by a known configuration, so a detailed description will be omitted. A configuration for controlling the opening and closing of the on-off valve of the pipe 6 is exemplified (for example, International Publication No. 2017/191678). In addition, opening and closing of the opening and closing valve of the exhaust pipe 6 may be performed by a timer, or may be performed manually.

In this way, the oxygen in the container 3 can be maintained at an appropriate concentration by appropriately exhausting the gas released from the polluted water through the exhaust pipe 6 when the dissolved gas is replaced. As a result, the oxygen body-dissolved water in which oxygen is dissolved at a high concentration can always be obtained.

Although the detailed configuration of the rectifying plates 4a and 4b will be described later, a convex portion 40a (see FIG. 2) that protrudes in the downstream direction of the polluted water is formed at the tip (downstream end) of the rectifying plate 4a. On the other hand, a recessed portion 40b (see FIG. 2) is formed at the tip of the rectifying plate 4b so as to be recessed on the side opposite to the flowing direction of the polluted water. This makes it possible to increase the surface area of the polluted water flowing down the projections 40a and the recesses 40b, compared to the case where the straightening vanes 4a and 4b have straight ends. As a result, the contact area between the oxygen and the polluted water can be increased, so that the gas dissolved in the polluted water can be efficiently replaced with oxygen. Furthermore, by forming the convex portion 40a, a long distance to the tip of the rectifying plate 4a can be secured, and the polluted water flowing down the rectifying plate 4a tends to form a thin water film. gas can be efficiently replaced with oxygen.

A predetermined amount of the oxygen-dissolved water that has flowed down the current plates 4 a and 4 b is stored on the bottom side of the container body 30 . This amount of storage is adjusted by a float-type water level sensor (not shown) floating on the liquid surface L of the oxygen-dissolved water, or the like. Therefore, detailed description is omitted.

A water level gauge 7 having both ends connected to the bottom of the container body 30 and the lid 32 is fixed to the container 3 . The water level gauge 7 is formed using a light-transmitting material such as glass or resin, and the storage amount of polluted water in the container 3 (the level of the liquid level L) can be calculated from the liquid level in the water level gauge 7. I can confirm.

A drain port 30b for discharging the oxygen-dissolved water to the outside is formed on the bottom surface 30a inside the container body 30, and a drain pipe 8 is connected to the drain port 30b. Note that the container body 30 (container 3 ) is supported by a plurality of legs 9 so as to be separated from the installation surface in order to provide the drain pipe 8 below the container body 30 .

By forming the drain port 30b on the bottom surface 30a of the container body 30, for example, compared to the case where the drain port 30b is formed on the inner peripheral surface 30c of the container 3, sludge contained in the polluted water is removed from the drain port 30b. be easily expelled from As a result, it is possible to suppress the sludge from remaining in the container 3, so that the flow rate of polluted water (oxygen-dissolved water) can be increased. Therefore, the processing capacity of the gas replacement device 1 can be improved.

Further, when the contaminated water flows down toward the bottom of the container body 30, the nitrogen originally dissolved in the contaminated water and the air bubbles such as oxygen filled in the container 3 are removed together with the contaminated water (oxygen-dissolved water). It may flow down to the bottom side of the body 30 . In such a case, air bubbles are mixed in the polluted water stored in the bottom portion of the container body 30 .

On the other hand, by forming the drain port 30b on the bottom surface 30a of the container body 30 as described above, compared to the case where the drain port is formed on the inner peripheral surface 30c of the container body 30, air bubbles mixed in the polluted water are discharged. A long distance can be secured until reaching the port 30b. As a result, the air bubbles contained in the polluted water can be floated to the liquid surface L side before reaching the drain port 30b, so that the polluted water containing air bubbles can be suppressed from flowing out from the drain port 30b into the water area to be purified. . That is, non-bubble oxygen-dissolved water can be returned to the water area to be purified.

Since the bottom surface 30a of the container body 30 is inclined downward from the inner peripheral surface 30c of the container body 30 toward the drain port 30b, the sludge flowing down to the bottom surface 30a side of the container body 30 easily flows toward the drain port 30b. Become. This also prevents the sludge from staying on the bottom surface 30a inside the container 3. As shown in FIG.

The drain pipe 8 connected to the drain port 30b branches into a first drain pipe 80 and a second drain pipe 81, and these first drain pipe 80 and second drain pipe 81 are opened and closed by an on-off valve (not shown). configured as possible.

Since the first drain pipe 80 connects the drain port 30b to the water area to be purified, the oxygen-dissolved water returned from the first drain pipe 80 to the water area to be purified can purify the water area. On the other hand, the second drain pipe 81 connects the drain port 30b to, for example, a drain channel at a location different from the water area to be purified. As a result, polluted water can be drained in a state in which oxygen is dissolved without being discharged directly to the outside of the water area to be purified, thereby suppressing contamination of the outside of the water area to be purified. Further, by adjusting the flow rate of the oxygen-dissolved water discharged from the second drain pipe 81, the amount of the oxygen-dissolved water returned from the first drain pipe 80 to the water area to be purified can be adjusted.

Thus, if the first drain pipe 80 and the second drain pipe 81 are provided in advance in the gas replacement device 1, the user separately prepares a means (such as a pipe) for dividing the oxygen-dissolved water. No need. That is, by simply connecting the first drain pipe 80 and the second drain pipe 81 to desired supply destinations, the oxygen-dissolved water can be diverted and the amount of supply to the diverted destinations can be adjusted. The convenience of the device 1 is improved.

Here, the rectifying plates 4a and 4b can be fixed directly to the inner peripheral surface 30c of the container body 30, but with such a configuration, the container body 30 is relatively small in the vertical direction (axial direction). Since they are formed long, fixing (for example, welding) the rectifying plates 4a and 4b to the container body 30 requires time and effort. Therefore, in this embodiment, after fixing the cylindrical body 31 to which the straightening plates 4 a and 4 b are welded to the container body 30 , the upper end portion thereof is covered with the lid body 32 . This configuration will be described with reference to FIGS. 2 and 3. FIG.

FIG. 2(a) is a top view of the straightening vanes 4a and 4b, and FIG. 2(b) is a top view of a disc 100 that is the material of the straightening vanes 4a and 4b. FIG. 3(a) is a cross-sectional view of a cylindrical body 31 showing a state in which the current plates 4a and 4b are welded, and FIG. 3(b) is a partially enlarged cross-sectional view of the gas replacement device 1 showing how the container 3 is assembled. is. In addition, in FIG. 3, the cross section which cut|disconnected in the position corresponding to FIG. 1 is illustrated.

When assembling the gas replacement device 1, first, as shown in FIG. As described above, the projections 40a and the recesses 40b are formed at the tips of the straightening plates 4a and 4b.

The outer edge of the straightening plate 4a excluding the convex portion 40a and the linear portion 41a is formed as a semicircular arc portion 42a, and the linear portion 41a extends in the normal direction of the arc portion 42a. Further, the outer edge of the current plate 4b excluding the concave portion 40b and the linear portion 41b is configured as a semicircular arc portion 42b, and the linear portion 41b extends in the normal direction of the arc portion 42b.

The concave portion 40b of the straightening plate 4b has a shape along the convex portion 40a of the straightening plate 4a. The outer edge along the arc portions 42a and 42b of 4b is circular. As a result, as shown in FIG. 2(b), if one metal disk 100 is cut along a cutting line 101 along the shape of the convex portion 40a and the straight portion 41a of the straightening plate 4a, the convex The rectifying plates 4a and 4b having the portion 40a and the concave portion 40b can be molded. As a result, it is possible to reduce the number of man-hours for forming the rectifying plates 4a and 4b, and reduce the material cost of the rectifying plates 4a and 4b.

In addition, since the convex portion 40a is formed at one point of the tip of the rectifying plate 4a, compared to the case where a plurality of concave and convex portions are formed at the tips of the rectifying plates 4a and 4b, for example, a semicircular shape having the convex portion 40a and the concave portion 40b is formed. can be easily formed from a single disk.

Furthermore, the tip of the convex portion 40a has a curved shape that is convex in the direction away from the arc portion 42a, and the connecting portion between the base end of the convex portion 40a and the straight portion 41a has a curved shape that is convex toward the arc portion 42a. It has become. That is, the projections 40a and the recesses 40b at the tips of the rectifying plates 4a and 4b are formed in smoothly curving waveforms. As a result, the semicircular rectifying plates 4a and 4b having the convex portions 40a and the concave portions 40b can be easily formed from a single disk 100, compared to the case where the convex portions 40a and the concave portions 40b are saw-toothed (square mountain shapes), for example. can be formed to

As shown in FIG. 3(a), after forming the rectifying plates 4a and 4b, arc portions 42a and 42b of the rectifying plates 4a and 4b are welded to the inner peripheral surface of the cylindrical body 31. As shown in FIG. At this time, welding is performed in a state in which the current plates 4a and 4b are inclined with respect to a plane perpendicular to the axis of the cylindrical body 31 (horizontal direction in FIG. 3(a)). If the angle exceeds 5.degree. The current plates 4a and 4b are formed by cutting one disk 100 (see FIG. 2). (curvature of the inner peripheral surface of the cylinder 31).

Therefore, the straightening plates 4a and 4b are arranged such that the angle of inclination (angle of downward inclination) of the straightening plates 4a and 4b with respect to a plane orthogonal to the axis of the cylindrical body 31 is 5° or less (3° in this embodiment). is preferably welded to the cylinder 31 . The angle of 5° or less is the angle of the straightening vanes 4a and 4b with respect to the horizontal direction after the gas replacement device 1 is assembled. By welding the rectifying plates 4a and 4b to the cylindrical body 31 at such an angle, it is possible to avoid the occurrence of excessive gaps between the arc portions 42a and 42b of the rectifying plates 4a and 4b and the inner peripheral surface of the cylindrical body 31. can be suppressed. As a result, the current plates 4a and 4b can be easily welded to the cylinder 31, and the occurrence of a gap between the current plates 4a and 4b and the inner peripheral surface of the cylinder 31 after welding can be suppressed. . That is, the straightening plates 4a and 4b and the inner peripheral surface of the cylindrical body 31 can be appropriately welded.

As shown in FIG. 3(b), after welding the current plates 4a and 4b to the cylindrical body 31, the cylindrical body 31 is fixed to the container body 30. The container body 30 is formed in a cylindrical shape with an open upper end, and the outer diameter of the cylindrical body 31 is slightly smaller than the inner diameter of the container body 30 . Therefore, when fixing the cylindrical body 31 to the container main body 30 , the cylindrical body 31 is inserted from the open portion of the upper end of the container 3 .

When the cylindrical body 31 is inserted, the intake port 30d passing through the side surface of the container body 30 and the through hole 31a passing through the side surface of the cylindrical body 31 are brought into communication. The water intake port 30d and the through hole 31a are portions to which the above-described water intake pipe 2 (see FIG. 1) is connected.

A flange 30e projecting radially outward is formed at the upper end of the container body 30, and a flange 31b projecting radially outward is formed at the upper end of the cylindrical body 31 as well. Since the outer diameter of the flange 31b of the cylindrical body 31 is larger than the inner diameter of the container body 30, when the cylindrical body 31 is inserted into the container body 30, the flange 31b of the cylindrical body 31 is hooked on the flange 30e of the container body 30. be able to. As a result, the fixing of the cylindrical body 31 to the container body 30 and the fixing of the lid body 32 to the upper end side of the container body 30 and the cylindrical body 31 are performed in a state in which the relative position of the cylindrical body 31 to the container body 30 is determined. be able to. Therefore, workability of the fixing work can be improved.

After inserting the cylindrical body 31 into the container main body 30 , the open portion on the upper end side of the cylindrical body 31 is covered with the lid body 32 . The lid body 32 is formed in a substantially hemispherical shape with an open bottom, and a flange 32a protrudes radially outward from the lower end of the lid body 32 . Therefore, the assembly of the container 3 is completed by tightening the flanges 30e, 31b, and 32a of the container body 30, the cylinder 31, and the lid 32 together with bolts and nuts (not shown).

As described above, the container 3 of this embodiment includes a container body 30 whose upper end side is open, and a cylindrical body 31 which is configured so as to be insertable from the upper end of the container body 30 and fixed to the inner peripheral side of the container body 30. , and a lid 32 that closes the upper ends of the container body 30 and the cylindrical body 31 . By fixing them, the rectifying plates 4a and 4b can be arranged on the inner peripheral side of the container body 30. As shown in FIG. That is, since it is sufficient to fix the rectifying plates 4a and 4b to the cylindrical body 31 having a smaller vertical (axial) dimension than the container body 30, workability of the fixing work can be improved.

Further, the cylindrical body 31 has a flange 31b projecting radially outward from its upper end side, and the outer diameter of the flange 31b is larger than the inner diameter of the container body 30, so that the cylindrical body 31 can be inserted into the container body 30. Thus, the flange 31b of the cylindrical body 31 can be hooked to the container body 30. As shown in FIG. Thereby, the workability of fixing the cover 32 to the upper end side of the cylinder 31 and the container main body 30 can be improved.

Although the present invention has been described based on the above embodiments, the present invention is by no means limited to the above embodiments, and it will be easily understood that various modifications and improvements are possible without departing from the scope of the present invention. It can be inferred. For example, it is naturally possible to apply the configuration related to the gas replacement device described in the background art above to the gas replacement device 1 of the above embodiment.

In the above-described embodiment, the intake pipe 2 is connected to the side surface of the container 3 (container main body 30), so that polluted water flows in along the extending direction of the current plate 4a (horizontal direction in FIG. 1). However, it is not necessarily limited to this. For example, by connecting the water intake pipe 2 to the upper surface (cover 32) of the container 3, the contaminated water may flow (fall) substantially vertically toward the upper surface of the current plate 4a (projections 40a). With this configuration, the rectifying plate 4a (convex portion 40a) can receive the polluted water flowing down from the water intake pipe 2, so the rectifying plate 4a (convex portion 40a) reliably functions to turn the polluted water into a thin water film. can be exhibited.

In the above embodiment, the case where the wavy convex portion 40a and the wavy concave portion 40b are formed at one point at the tip of the current plate 4a, 4b has been described, but the present invention is not necessarily limited to this. For example, a plurality of protrusions 40a and recesses 40b may be formed at the tips of the straightening plates 4a and 4b, or the protrusions 40a and recesses 40b may be formed in a sawtooth shape. Alternatively, the convex portion 40a or the concave portion 40b may be formed only on one of the rectifying plates 4a and 4b, or the convex portion 40a and the concave portion 40b of the rectifying plates 4a and 4b may be omitted, and the tips of the rectifying plates 4a and 4b may be straight. It may be composed only of the portions 41a and 41b.

In the above embodiment, the convex portion 40a of the straightening plate 4a has a shape along the concave portion 40b of the straightening plate 4b, and the straightening plates 4a and 4b are formed from a single disk 100. However, this is not necessarily the case. It is not something that can be done. For example, each of the rectifying plates 4a and 4b may be formed with a convex portion 40a (a concave portion 40b) having the same shape. In addition, it is also possible to adopt a configuration in which the rectifying plates 4a and 4b do not form a single disk when the ends of the rectifying plates 4a and 4b are brought into contact with each other so that the uneven portions are fitted to each other. Configuration is fine. That is, the present invention is not limited to the configuration in which the rectifying plates 4a and 4b are formed using one disc 100 as a material.

Further, instead of forming the rectifiers 4a and 4b from a single disk 100, the rectifiers 4a and 4b may be cut out from a metal plate larger than the disk 100. Even in this configuration, it is preferable that at least the convex portions 40a of the straightening plates 4a and 4b have a shape along the concave portions 40b. Accordingly, by cutting the metal plate along the shape of the convex portions 40a (concave portions 40b), the convex portions 40a and the concave portions 40b of the straightening plates 4a and 4b can be formed at the same time. man-hours can be reduced.

In the above embodiment, the inclination angle of each of the straightening vanes 4a and 4b with respect to the horizontal direction is 3° (5° or less), but it is not necessarily limited to this. For example, the straightening vanes 4a and 4b may have an angle of more than 5° with respect to the horizontal direction, or may be parallel to the horizontal direction. Further, the angle of the rectifying plate 4a with respect to the horizontal direction may be larger (smaller) than the angle of the rectifying plate 4b.

In the above embodiment, the current plates 4a and 4b are welded to the inner peripheral surface of the cylindrical body 31, but the present invention is not necessarily limited to this. For example, the rectifying plates 4a and 4b may be joined to the inner peripheral surface of the cylindrical body 31 by known fixing means such as bolts and rivets. It is preferable to set the inclination angle of 4b to 3° (5° or less). As a result, it is possible to suppress the formation of gaps between the cylindrical body 31 and the rectifying plates 4a and 4b, so that they can be properly joined (the jointed cylindrical body 31 and the rectifying plates 4a and 4b can be properly joined together). It is possible to suppress the occurrence of gaps between them).

In the above embodiment, the container 3 is composed of the container body 30, the cylinder 31, and the lid 32, and the rectifying plates 4a and 4b are fixed to the inner peripheral surface of the cylinder 31. However, this is not necessarily the case. It is not limited. For example, the cylinder 31 may be omitted and the rectifying plates 4a and 4b may be directly fixed to the inner peripheral surface 30c of the container body 30, or the cylinder 31 and the lid 32 may be integrated.

In the above embodiment, the flanges 30e, 31b, and 32a of the container body 30, cylinder 31, and lid 32 are fastened together with bolts and nuts, but the invention is not necessarily limited to this. For example, the flange 31b of the cylindrical body 31 may be omitted, and a metal fitting for hooking the cylindrical body 31 may be provided on the inner peripheral surface 30c of the container body 30. FIG. Alternatively, the tubular body 31 may be welded to the inner peripheral surface 30c of the container body 30 without using such a fitting for hooking the tubular body 31 . In other words, as long as the cylindrical body 31 can be fixed to the inner peripheral side of the container body 30, the fixing method is not limited to the above embodiment.

In the above embodiment, the bottom surface 30a of the container body 30 is formed with the drain port 30b, and the bottom surface 30a is inclined downward from the inner peripheral surface 30c of the container body 30 toward the drain port 30b. is not limited to For example, the drain port 30b may be formed on the inner peripheral surface 30c (side surface) of the container body 30, or the bottom surface 30a of the container body 30 may be parallel to the horizontal direction.

In the above embodiment, the gas supplied from the supply pipe 5 (gas supply means) to the container 3 is oxygen, but it is not necessarily limited to this. For example, other gases such as nitrogen, carbon dioxide, hydrogen, ozone, or argon may be supplied through supply pipe 5 .

In the above embodiment, the drain pipe 8 includes the first drain pipe 80 for returning the oxygen-dissolved water to the water area to be purified, and the second drain pipe 80 for discharging the oxygen-dissolved water to a place (drainage channel) different from the water area to be purified. Although the case of having two drain pipes 81 has been described, it is not necessarily limited to this. For example, the drain pipe 8 may be composed only of the first drain pipe 80, or may be configured to provide another drain pipe in addition to the drain pipes 80 and 81.

1 gas replacement device 2 water intake pipe (treated water supply means)
3 Container 30 Container main body 30a Bottom surface 30b Drain port 30c Inner circumferential surface 31 Cylindrical body 31b Flange 32 Lid 4a Straightening plate (first straightening plate)
40a convex portion 4b rectifying plate (second rectifying plate)
40b recess 5 supply pipe (gas supply means)
8 drain pipe 80 first drain pipe 81 second drain pipe

Claims (10)

1. a gas supply means for supplying gas; a cylindrical container whose interior is pressurized to atmospheric pressure or higher by the gas supplied from the gas supply means; and a plurality of rectifying plates fixed inside the container; a treated water supply means for supplying the treated water flowing down by the plurality of rectifying plates from a water source to the container, wherein the gas dissolved in the treated water is supplied from the gas supply means. In the gas replacement device to replace
   The rectifying plate includes a first rectifying plate that slopes downward in a first direction, and a second straightening plate that slopes downward in a second direction opposite to the first direction,
   The gas replacement, wherein the first straightening vanes and the second straightening vanes are arranged alternately in a vertical direction, and the treated water flows down while meandering through the first straightening vanes and the second straightening vanes. Device.
2. The gas replacement device according to claim 1, wherein the first rectifying plate and the second rectifying plate are provided with a convex portion or a concave portion formed at their downstream end portions.
3. The first straightening plate includes the convex portion,
   3. The gas replacement device according to claim 2, wherein the second rectifying plate has the concave portion having a shape along the convex portion.
4. The outer edges of the first straightening plate and the second straightening plate are circular when the first straightening plate and the second straightening plate are butted against each other such that the convex portion is fitted in the concave portion. The gas replacement device according to claim 3.
5. 5. The gas replacement device according to claim 4, wherein the inclination angle of the first rectifying plate and the second rectifying plate with respect to a plane perpendicular to the axial direction of the container is 5° or less.
6. 6. The gas replacement device according to any one of claims 1 to 5, further comprising a drain port formed on the bottom surface inside the container for discharging the treated water to the outside of the container.
7. The gas replacement device according to claim 6, wherein the bottom surface inside the container is inclined downward from the inner peripheral surface side of the container toward the drain port side.
8. A drain pipe connected to the drain outlet,
   4. The drain pipe comprises a first drain pipe for returning the treated water to the water source, and a second drain pipe for draining the treated water to a location different from the water source. 8. The gas replacement device according to 6 or 7.
9. The container comprises a container body whose upper end side is open, a cylindrical body configured so as to be insertable from the upper end of the container body and fixed to the inner peripheral side of the container body, and upper end sides of the container body and the cylindrical body. and a closing lid,
   The first straightening plate and the second straightening plate are fixed to the inner peripheral surface of the cylindrical body,
   9. The gas replacement device according to any one of claims 1 to 8, wherein the vertical dimension of the cylindrical body is smaller than that of the container body.
10. The cylindrical body has a flange projecting radially outward from its upper end side,
    10. The gas replacement device according to claim 9, wherein the outer diameter of said flange is larger than the inner diameter of said container body.

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