JP6925612B2 - Gas replacement unit - Google Patents

Description

The present invention relates to a gas replacement unit, and more particularly to a gas replacement unit capable of efficiently reusing the gas recovered from the defoaming device.

A gas replacement device that produces dissolved water by replacing a gas dissolved in raw water (for example, water or seawater) (for example, replacing nitrogen with oxygen) and a gas replacement device that defoams the dissolved water sent from the gas replacement device. A gas replacement unit including a defoaming device for removing (removing and recovering air bubbles contained in dissolved water) is known.

For example, in Patent Document 1, a raw water tank for storing raw water, raw water is supplied from the raw water tank, and the gas dissolved in the raw water is replaced with oxygen to dissolve water (dissolved water in which oxygen is dissolved). A gas that is equipped with an oxygen melting device that produces a gas and a cyclone-type defoaming device for defoaming the dissolved water sent from the oxygen-dissolving device, and the cyclone-type defoaming device and the raw water tank are connected by an aeration pipe. The replacement unit is disclosed.

According to this gas replacement unit, the oxygen recovered from the cyclone type defoaming device is returned to the raw water tank via the aeration pipe. Since the oxygen returned to the raw water tank is dissolved in the raw water by aeration, the oxygen recovered by the cyclone type defoaming device can be reused.

Japanese Unexamined Patent Publication No. 2014-188458 (for example, paragraph 0028, FIG. 1)

However, in the above-mentioned conventional technique, the gas recovered from the defoaming device is dissolved in the raw water by aeration, and the raw water is supplied to the gas replacement device. That is, the gas that is not dissolved in the raw water stays in the raw water tank or is discharged from the raw water tank to the outside, so that it is not returned to the gas replacement device. Therefore, there is a problem that the gas recovered from the defoaming device cannot be efficiently reused.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a gas replacement unit capable of efficiently reusing the gas recovered from the defoaming device.

Means for Solving Problems and Effects of Invention

According to the gas replacement unit according to claim 1, it has a suction port and a discharge port, is connected to a compressor formed as a compressor for compressing gas, and is connected to a second pipe, and buffers the pulsation of the pump. An air chamber formed as a shock absorber and a fourth pipe having one end connected to the discharge port of the compressor and the other end connected to the air chamber are provided, and the third pipe has the other end of the compressor. Since it is connected to the suction port , the gas recovered from the defoaming device is supplied to the air chamber via the third pipe, the compressor and the fourth pipe. That is, since the gas recovered from the defoaming device is filled in the air chamber in a pressurized state by the compressor, the gas is gradually dissolved in the raw water in the air chamber (raw water flowing through the second pipe). Thus, the gas recovered from antifoaming device because it is sent returned to the gas body replacement device, there is an effect that it is possible to reuse the recovered gas from the antifoaming device efficiently. Further, there is an effect that the gas collected by the defoaming device can be used as a compressed gas in the air chamber, dissolved in the raw water in the air chamber, and supplied to the gas replacement device.

According to the gas substitution unit according to claim 2, in addition to the effects of the gas replacement unit according to claim 1 Symbol placement, antifoaming device, the convex cross-sectional shape of the ceiling surface of the interior protrudes on the upper side in the vertical direction Since one end of the third pipe is connected to the protruding tip of the ceiling surface, it is possible to prevent the dissolved water stored inside the defoaming device from being sucked into the compressor via the third pipe. .. Therefore, it is possible to prevent the dissolved water generated by the gas replacement device from being returned to the gas replacement device again, so that the effect of being able to efficiently generate the dissolved water (replacement treatment for raw water) by the gas replacement device is possible. There is.

According to the gas substitution unit according to claim 3, in addition to the effects of the gas replacement unit according to claim 2, wherein a water level sensor for detecting the water level inside the antifoaming device, while being disposed in the third pipe, An on-off valve formed as a valve for opening and closing the communication state of the third pipe, and when the water level sensor detects a water level higher than a predetermined threshold, the on-off valve is closed to close the third pipe. Since the closing means is provided, it is possible to more reliably prevent the dissolved water stored inside the defoaming device from being sucked into the compressor via the third pipe. Therefore, it is possible to more reliably prevent the dissolved water generated by the gas replacement device from being returned to the gas replacement device again, so that the generation of dissolved water (replacement treatment for raw water) by the gas replacement device can be performed more efficiently. It has the effect of being able to.

It is a front view of the gas substitution unit in the reference example of this invention. (A) is a cross-sectional view of the defoaming device, and (b) is a cross-sectional view of the defoaming device in line IIb-IIb of FIG. 2 (a). It is a partially enlarged sectional view of a gas substitution unit. It is a flowchart which shows the solenoid valve control processing. It is a front view of the gas substitution unit in one Embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, with reference to FIG. 1, the overall configuration of the gas substitution unit 1 in the reference example of the present invention will be described. FIG. 1 is a front view of the gas replacement unit 1 in the reference example of the present invention. In FIG. 1, the gas substitution unit 1 is schematically shown in order to simplify the drawing.

As shown in FIG. 1, one end of the gas replacement unit 1 is connected to a purified water area (raw water tank) (not shown), and an intake pipe for taking raw water (polluted water) from the purified water area. 10, a pump 20 connected to the other end of the intake pipe 10, an inflow pipe 30 having one end connected to the pump 20, and an inflow pipe 30 connected to the other end of the inflow pipe 30, and water is taken by the pump 20. A gas replacement device 40 for generating dissolved water from raw water, a defoaming device 50 for defoaming the dissolved water sent from the gas replacement device 40 while being connected to the gas replacement device 40, and a defoaming device 50 thereof. A return pipe 60, one end of which is connected to the defoaming device 50 and the other end of which is connected to the intake pipe 10, is provided.

The water intake pipe 10 is a pipe for connecting the purified water area (raw water tank) and the pump 20. The pump 20 is a pump that includes a suction port 21 for sucking raw water and a discharge port 22 for discharging the raw water, and pumps a liquid (or gas) by the action of pressure.

The inflow pipe 30 is a pipe for flowing the raw water pumped by the pump 20 into the gas replacement device 40, and the other end is connected to the upper part (upper side of FIG. 1) of the gas replacement device 40.

The gas replacement device 40 is made of a material having corrosion resistance such as stainless steel or a hard synthetic resin (for example, FRP), and is not damaged even if the internal pressure is increased to atmospheric pressure or higher. A container body having pressure resistance is provided inside.

At the upper part (upper side of FIG. 1) of the gas replacement device 40, an oxygen supply pipe 41 for supplying oxygen from the oxygen supply source to the inside of the container body and an exhaust pipe 42 for exhausting the gas inside the container body. And are connected.

The oxygen supply pipe 41 and the exhaust pipe 42 are provided with an oxygen supply valve 41a and an exhaust valve 42a, respectively, which are composed of solenoid valves. It is controlled by the control device 43 provided.

Oxygen is supplied into the container by adjusting the opening degree of the oxygen supply valve 41a with the exhaust valve 42a closed, and by opening the exhaust valve 42a with the oxygen supply valve 41a closed, the gas replacement device 40 The gas (nitrogen in this reference example ) generated by the replacement process is discharged to the outside.

The gas replacement device 40 replaces the gas dissolved in the raw water taken from the purified water area such as a river or a lake (in this reference example , replaces nitrogen with oxygen), and the dissolved water (oxygen) obtained is obtained. It is a device for supplying (outflow, water supply) to the purified water area again (dissolved oxygen-dissolved water). The container of the gas replacement device 40 is filled with oxygen in a pressurized state (0.05 MPa in this reference example ), and the raw water flowing into the container comes into contact with oxygen and dissolves in the raw water. Nitrogen is replaced with oxygen.

When the dissolved water treated by the gas replacement device 40 is supplied to the purified water area, the amount of dissolved oxygen (DO) in the purified water area increases, and the microorganisms in the purified water area are activated. As a result, the decomposition of organic matter in the purified water area is promoted, and the water quality of the purified water area can be improved.

One end of a delivery pipe 44 that communicates the inside and the outside of the gas replacement device 40 (container body) is connected to the lower side surface (lower side surface of FIG. 1) of the gas replacement device 40. The delivery pipe 44 is a pipe for connecting the gas replacement device 40 and the defoaming device 50, and the other end is connected to the lower side surface of the defoaming device 50.

The defoaming device 50 is a device for removing bubbles (oxygen) of the dissolved water generated by the gas replacing device 40, and the pressure inside the defoaming device 50 is the same as the atmospheric pressure (from the pressure inside the gas replacing device 40). Also low) is set.

Here, in the gas replacement device 40, dissolved water is generated by being dissolved in raw water in a state where oxygen is pressurized. Therefore, when the dissolved water is returned to the atmospheric pressure state, it is dissolved in the dissolved water. Oxygen may be released as bubbles (for example, oxygen having a concentration of 30 ppm is reduced to 20 ppm, and the difference of 10 ppm of oxygen is released as bubbles). In particular, when the processing capacity of the gas replacement device 40 (efficiency of dissolving oxygen in raw water) is high, the amount of oxygen released as bubbles from the dissolved water increases. The oxygen bubbles are collected by the defoaming device 50.

Next, the detailed configuration of the defoaming device 50 will be described with reference to FIG. FIG. 2A is a cross-sectional view of the defoaming device 50, and FIG. 2B is a cross-sectional view of the defoaming device 50 in line IIb-IIb of FIG. 2A. The arrows A to C in FIG. 2A represent the movement paths of the dissolved water in the defoaming device 50, respectively. Further, in FIG. 2B, the illustration of the control device 55 is omitted.

As shown in FIG. 2, the defoaming device 50 is a tubular container having a circular cross section, and has a ceiling surface 51 forming a ceiling in the container and a vertical direction with the ceiling surface 51 (FIG. 2 (a)). ) In the vertical direction), and the partition 52 arranged at a predetermined interval, and the outflow formed as a pipe connected to the lower side surface of the defoaming device 50 and arranged to face the delivery pipe 44 with the partition 52 in between. A pipe 53, a water level sensor 54 for detecting the water level inside the defoaming device 50, and a control device 55 for controlling the solenoid valve 61 based on the water level of the water level sensor 54 are provided.

The height dimension of the internal space of the defoaming device 50 (the distance between the bottom surface inside the defoaming device 50 and the apex of the ceiling surface 51) is set to 1100 mm, and the distance between the ceiling surface 51 and the upper end of the partition wall 52 is set. Is set to 200 mm.

The ceiling surface 51 is formed in a curved shape (that is, as a hemispherical ceiling surface) whose cross section projects upward in the vertical direction of the defoaming device 50, and the return pipe 60 is connected to the apex portion thereof. The return pipe 60 is a pipe for recovering oxygen bubbles collected on the ceiling surface 51 side.

The partition wall 52 is a flat plate-shaped wall extending from the bottom surface of the defoaming device 50 to the ceiling surface 51 side, and the partition wall 52 is on the side where the delivery pipe 44 in the internal region of the defoaming device 50 is arranged. The region and the region on the side where the outflow pipe 53 is arranged are separated.

Therefore, the dissolved water flowing into the inside of the defoaming device 50 from the delivery pipe 44 rises along the partition wall 52 in the region on the delivery pipe 44 side in the internal region of the defoaming device 50 (movement path A) and dissolves the region. Oxygen bubbles mixed in water also rise toward the ceiling surface 51 (along the flow of dissolved water).

The communication state of the return pipe 60 connected to the ceiling surface 51 is opened or closed by the solenoid valve 61 provided in the return pipe 60, and the opening / closing operation of the solenoid valve 61 is arranged in the defoaming device 50. It is controlled by the control device 55. When the communication state of the return pipe 60 is open, the air bubbles collected inside the defoaming device 50 are collected by the return pipe 60. In this case, one end of the return pipe 60 is connected to the defoaming device 50, and the other end is connected to the water intake pipe 10 (the suction port 21 side of the pump 20) (see FIG. 1). The collected oxygen bubbles are sucked by the suction force of the pump 20 through the return pipe 60 and discharged (pressure-fed) to the inflow pipe 30.

That is, since the oxygen bubbles recovered from the defoaming device 50 via the return pipe 60 are directly returned to the gas replacement device 40 by the pump 20, all the oxygen recovered from the defoaming device 50 is returned to the gas replacement device 40. Can be supplied to. Therefore, the oxygen recovered from the defoaming device 50 can be efficiently reused.

Here, for example, when the return pipe 60 is directly connected to the inflow pipe 30, the raw water pumped by the pump 20 flows into the return pipe 60 and flows back to the defoaming device 50 side. That is, in order to directly connect the return pipe 60 to the inflow pipe 30 and supply oxygen, it is necessary to pressurize the oxygen and supply the oxygen from the return pipe 60 to the inflow pipe 30. For example, a compressor) is required separately.

On the other hand, according to the gas replacement unit 1 of this reference example , since the return pipe 60 is connected to the intake pipe 10, the oxygen recovered from the defoaming device 50 is returned to the gas replacement device 40 by the pump 20. Can be done. Therefore, for example, as compared with the case where the return pipe 60 is connected to the inflow pipe 30, the device for pressurizing oxygen and supplying it to the inflow pipe 30 can be omitted, so that the product cost of the gas replacement unit 1 can be reduced.

Here, the connection portion between the intake pipe 10 and the return pipe 60 will be described with reference to FIG. FIG. 3 is a partially enlarged cross-sectional view of the gas replacement unit 1 showing the connection portion between the intake pipe 10 and the return pipe 60. In FIG. 3, the internal structure of the pump 20 is not shown, and its cross section is shown by hatching. Further, the arrow D in FIG. 3 represents the movement path of oxygen discharged from the return pipe 60.

As shown in FIG. 3, the return pipe 60 is inserted into the water intake pipe 10 so as to penetrate the side surface of the water intake pipe 10. The end (other end) of the return pipe 60 inserted into the water intake pipe 10 is formed by bending in the pumping direction (right side in FIG. 3) of the pump 20, and the opening 62 at the end is the suction port of the pump 20. It is arranged in a posture facing the 21 side. As a result, oxygen is discharged from the opening 62 of the return pipe 60 toward the suction port 21 of the pump 20 (movement path D), so that the oxygen discharged from the return pipe 60 can be easily sucked by the pump 20. ..

That is, for example, the opening 62 of the return pipe 60 is bent in a posture opposite to the pumping direction of the pump 20 (left side in FIG. 3), and the opening 62 of the return pipe 60 is the pumping direction of the pump 20. In the case of a configuration in which the return pipe 60 is arranged in a vertical direction (upper or lower side in FIG. 3) (a configuration in which the return pipe 60 penetrates the outer peripheral surface of the intake pipe 10 without bending), the water flows through the intake pipe 10. Raw water may flow back through the return pipe 60, hindering the pump 20 from pumping oxygen to the gas replacement device 40.

On the other hand, according to the gas replacement unit 1 of this reference example , the opening 62 of the return pipe 60 is arranged so as to face the pump 20 in the pumping direction, so that the raw water flowing through the intake pipe 10 passes through the return pipe 60. Backflow can be suppressed. Therefore, the oxygen recovered from the defoaming device 50 can be reliably pumped to the gas replacing device 40 by the pump 20.

Here, "the other end of the third pipe (return pipe 60) is connected to the first pipe (intake pipe 10)" in claim 1 is discharged from at least the return pipe 60 (third pipe). It is a requirement that oxygen (gas) is directly sucked by the pump 20, and if the configuration is such that the oxygen discharged from the return pipe 60 is directly sucked by the pump 20, the return pipe is as shown in this reference example. The 60 may be arranged so as to be separated from the suction port 21 of the pump 20, or the return pipe 60 may be directly connected to the suction port 21 of the pump 20.

It will be described back to FIG. As described above, the internal region of the defoaming device 50 is divided by the partition wall 52, and the dissolved water rises along the partition wall 52 (movement path A) in the region on the delivery pipe 44 side thereof, and the oxygen bubbles are similarly (dissolved). It rises to the ceiling surface 51 side (along the flow of water). Therefore, since the oxygen bubbles can be easily moved to the ceiling surface 51 side, the oxygen bubbles can be efficiently recovered from the return pipe 60 connected to the ceiling surface 51.

In this case, the height dimension of the internal space of the defoaming device 50 is set to 1100 mm, and the distance dimension between the ceiling surface 51 and the upper end of the partition wall 52 is set to 200 mm. That is, since the upper end of the partition wall 52 is located above the center of the internal space of the defoaming device 50 in the vertical direction, the flow of dissolved water rising inside the defoaming device 50 is formed to a position close to the ceiling surface 51. can do. Therefore, since the oxygen bubbles mixed in the dissolved water can be more reliably guided to the ceiling surface 51 side, the oxygen bubbles can be efficiently recovered from the return pipe 60 connected to the ceiling surface 51.

Further, since the cross section of the ceiling surface 51 is formed in a curved shape protruding upward in the vertical direction of the defoaming device 50, oxygen rising inside the defoaming device 50 is accumulated in the protruding tip portion of the ceiling surface 51. In this case, according to the gas replacement unit 1 of this reference example , the return pipe 60 is connected to the protruding tip portion of the ceiling surface 51, so that the oxygen accumulated in the protruding tip portion of the ceiling surface 51 can be efficiently removed from the return pipe 60. It can be recovered.

Further, in this reference example , the cross-sectional area of the delivery pipe 44 is compared with the cross-sectional area of the internal region on the delivery pipe 44 side (the flow path of the dissolved water rising from the delivery pipe 44 to the inside of the defoaming device 50) divided by the partition wall 52. The cross-sectional area is formed small. Therefore, the flow velocity of the dissolved water rising from the delivery pipe 44 to the inside of the defoaming device 50 is slowed down as compared with the flow velocity of the dissolved water flowing through the delivery pipe 44. As a result, bubbles mixed in the dissolved water are prevented from passing over the partition wall 52 together with the flow of the dissolved water and flowing down to the region on the outflow pipe 53 side (that is, oxygen flows out to the outside of the defoaming device 50). can. Therefore, oxygen bubbles can be efficiently recovered by the return pipe 60.

The dissolved water that passes over the partition wall 52 and flows down to the region on the outflow pipe 53 side (movement path B) is discharged from the outflow pipe 53 to the outside of the defoaming device 50 (moving path C), while the dissolved water flows out to the defoaming device 50. The water level is detected by the water level sensor 54.

In this case, since the outflow pipe 53 is arranged with the inner end of the defoaming device 50 (that is, the opening of the outflow pipe 53) of the outflow pipe 53 facing downward, for example, dissolved water. Even if the oxygen bubbles mixed in the above flow over the partition wall 52 and flow down to the outflow pipe 53 side, it is possible to prevent the oxygen bubbles from flowing into the outflow pipe 53. That is, since it is possible to suppress the outflow of oxygen to the outside of the defoaming device 50, the oxygen bubbles can be efficiently recovered by the return pipe 60.

The water level sensor 54 is a water level sensor that includes a sensor unit and a float unit that is formed so as to float on the surface of the dissolved water, and the water level is detected by the sensor unit when the float unit rises or falls. The water level sensor 54 is arranged at a height located above the upper end of the partition wall 52 in the vertical direction of the defoaming device 50 and below the ceiling surface 51, and is electromagnetically generated based on the detection state of the water level sensor 54. The opening / closing operation of the valve 61 is controlled.

Next, with reference to FIG. 4, the process executed by the control device 55 of the defoaming device 50 will be described. FIG. 4 is a flowchart showing the solenoid valve control process. This solenoid valve control process is executed periodically (for example, every 100 ms) by the control device 55. In the solenoid valve control process, the solenoid valve 61 is controlled based on a first threshold value for defining the upper limit of the water level and a second threshold value for defining the lower limit of the water level.

As shown in FIG. 4, in the control device 55, is the water level in the defoaming device 50 detected by the water level sensor 54 exceeding the first threshold value (the distance from the ceiling surface 51 to the water surface is, for example, 50 mm or more). Is also short)? (S1). In the treatment of S1, when the water level exceeds the first threshold value (S1: Yes), the water surface of the dissolved water may fluctuate and come into contact with the ceiling surface 51. Therefore, the solenoid valve 61 of the return pipe 60 Closes (S2) to end a series of processes. By the treatment of S2, it is possible to prevent the dissolved water stored in the defoaming device 50 from being sucked into the pump 20 via the return pipe 60.

In this case, the cross section of the ceiling surface 51 is formed in a curved shape protruding upward in the vertical direction of the defoaming device 50, and the return pipe 60 is connected to the apex portion of the defoaming device 50. It is possible to more reliably prevent water from being sucked into the pump 20 via the return pipe 60. In this way, by suppressing the dissolved water from being sucked into the pump 20 and being returned to the gas replacement device 40 again, the gas replacement device 40 can efficiently generate the dissolved water (replacement treatment for the raw water). (When the dissolved water is returned to the gas replacement device 40 again, the amount of raw water supplied to the gas replacement device 40 is reduced by that amount, so that the processing amount of the replacement treatment for the raw water is reduced).

On the other hand, in the process of S1, when the water level does not exceed the first threshold value (S1: No), is the water level in the defoaming device 50 detected by the water level sensor 54 below the second threshold value (ceiling surface)? It is confirmed whether or not the distance from 51 to the water surface is longer than, for example, 150 mm (S3). In the process of S3, when the water level is below the second threshold value (S3: Yes), the solenoid valve 61 of the return pipe 60 is opened (S4), and the series of processes is completed. On the other hand, in the process of S3, when the water level does not fall below the second threshold value (S3: No), a series of processes is terminated. In this way, by giving a range to the upper and lower thresholds of the water level of the defoaming device 50, it is possible to prevent the solenoid valve 61 from opening and closing excessively.

Next, a preferred embodiment of the present invention will be described with reference to FIG. In the above reference example , the case where the return pipe 60 is connected to the intake pipe 10 has been described, but in the present embodiment, the first return pipe 260 and the second return pipe 280 are connected to the inflow pipe 30 (air chamber 290). The case where it is done will be described. The same parts as those in the above-mentioned reference example are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 5 is a front view of the gas replacement unit 201 according to the embodiment of the present invention. In FIG. 5, the gas replacement unit 201 is schematically shown in order to simplify the drawing. As shown in FIG. 5, the gas replacement unit 201 is connected to a first return pipe 260 whose one end is connected to the upper part (upper side of FIG. 5) of the defoaming device 50 and the other end of the first return pipe 260. At the same time, a compressor 270 formed as a compressor for compressing gas, a second return pipe 280 having one end connected to the compressor 270, and a pump 20 connected to the other end of the second return pipe 280. Includes an air chamber 290, which is formed as a shock absorber for buffering the pulsation of the gas.

The first return pipe 260 is a pipe for recovering oxygen collected by the defoaming device 50, and the other end is connected to the suction port 271 of the compressor 270, and the second return pipe is connected to the discharge port 272 of the compressor 270. 280 is connected.

The second return pipe 280 is a pipe for returning oxygen compressed by the compressor 270 to the air chamber 290. A space filled with oxygen is formed inside the air chamber 290, and the internal space is filled with oxygen in a pressurized state. The internal space of the air chamber 290 communicates with the inside of the inflow pipe 30, and the internal space of the air chamber 290 is filled with oxygen in a pressurized state, so that the pulsation of the pump 20 is buffered. , Damage to the intake pipe 10, the pump 20, and the inflow pipe 30 due to the pulsation can be suppressed. Therefore, the durability of the gas replacement unit 201 is improved.

Further, when the inside of the air chamber 290 is filled with oxygen in a pressurized state, oxygen is gradually dissolved in the raw water (raw water flowing through the inflow pipe 30) inside the air chamber 290, and the oxygen is released. The dissolved raw water is supplied to the gas replacement device 40.

That is, while using the oxygen recovered from the defoaming device 50 as the compressed gas in the air chamber 290, it is dissolved in the raw water inside the air chamber 290 (raw water flowing through the inflow pipe 30) and supplied to the gas replacement device 40. be able to. Therefore, the oxygen recovered from the defoaming device 50 can be efficiently reused.

Having described the present invention based on reference examples and embodiments, the present invention is not in any way limited to the Reference Examples and embodiments described above, various improvements without departing from the scope of the present invention It is easy to infer that changes are possible.

In the above reference example and the embodiment, the case where the gas filled in the container body of the gas replacement device 40 (that is, the gas recovered from the defoaming device 50) is oxygen has been described, but it is not necessarily limited to this. is not it. For example, the gas filled in the container of the gas replacement device 40 may be ozone, nitrogen, hydrogen or carbon dioxide.

In the above reference example and the embodiment, the case where the raw water treated by the gas substitution unit 1,201 is polluted water has been described, but the present invention is not necessarily limited to this. For example, the liquid to be replaced by the gas replacement device 40 may be seawater. In this case, since salt is originally dissolved in seawater, the amount of oxygen that can be dissolved is also reduced as compared with water (raw water in which salt is not dissolved). That is, when dissolved water is generated from seawater by the gas replacement device 40, when the dissolved water is returned to the atmospheric pressure state, the amount of oxygen released as bubbles from the dissolved water increases (the gas replacement device 40 increases the amount of oxygen released from the water). Increased compared to when dissolved water is produced). Therefore, for example, the configuration of the gas replacement unit 1,201 is applied to a fish farm (for example, shrimp) (seawater is taken from the farm from the water pipe 10 and oxygen is dissolved from the outflow pipe 53. To the farm) is preferred. As a result, oxygen can be used more efficiently.

In the above reference example and the embodiment, the case where the cross section of the ceiling surface 51 is formed in a curved shape protruding upward in the vertical direction of the defoaming device 50 has been described, but the present invention is not necessarily limited to this, and the ceiling surface 51 is not necessarily limited to this. The cross section of the above may be polygonal. That is, at least the cross-sectional shape of the ceiling surface 51 may be formed into a convex shape protruding upward in the vertical direction of the defoaming device 50, and the return pipe 60 may be connected to the protruding tip portion. As a result, it is possible to prevent the dissolved water stored inside the defoaming device 50 from being sucked into the pump 20 (compressor 270) via the return pipe 60 (first return pipe 260).

In the above reference example and the embodiment, the solenoid valve 61 is exemplified as a valve for opening and closing the communication state of the return pipe 60 and the first return pipe 260, but the present invention is not necessarily limited to this, and for example, the solenoid valve 61 is manually operated. It may be composed of a valve, an electric valve, or a cylinder valve.

In the reference example, return tube 60 is connected to the intake pipe 10, in the above embodiment has been described a case where the first return pipe 260 and the second return pipe 280 is connected to the inlet pipe 30 (air chamber 290) However, it is not always limited to this. For example, the configuration of the above embodiment may be combined with the configuration in which the return pipe 60 is connected to the intake pipe 10 (the configuration of the reference example). In this case, the return pipe 60 and the first return pipe 260 may be connected to two places on the ceiling surface 51 of the defoaming device 50, respectively.

Here, since the amount of oxygen dissolved in the raw water in the air chamber 290 within the predetermined time is smaller than the amount of oxygen recovered from the defoaming device 50 within the predetermined time, the oxygen recovered from the defoaming device 50. The amount of oxygen becomes excessive. On the other hand, by combining the configuration of the above embodiment with the configuration in which the return pipe 60 is connected to the intake pipe 10, the excess oxygen can be directly returned to the gas replacement device 40. Therefore, the pulsation of the pump 20 can be suppressed by the oxygen recovered from the defoaming device 50, and the oxygen recovered from the defoaming device 50 can be efficiently reused.

1,201 Gas replacement unit 10 Intake pipe (first pipe)
20 Pump 21 Pump suction port 22 Pump discharge port 30 Inflow pipe (second pipe)
40 Gas replacement device 50 Defoaming device 51 Ceiling surface 54 Water level sensor 60 Return pipe (third pipe)
61 Solenoid valve (on-off valve)
62 Opening 260 1st return pipe (3rd pipe)
270 Compressor 271 Compressor suction port 272 Compressor discharge port 280 2nd return pipe (4th pipe)
290 Air chamber S2 Closing means

Claims (3)

A first pipe formed as a pipe having one end connected to a region where raw water is stored, a pump having a suction port and a discharge port, and the other end of the first pipe connected to the suction port, and a pump thereof. A second pipe formed as a pipe having one end connected to the discharge port of the pump and the other end of the second pipe are connected to allow the raw water to flow in and replace the gas dissolved in the raw water. A gas replacement device for generating dissolved water, a defoaming device for defoaming the dissolved water sent from the gas substituting device while being connected to the gas substituting device, and one end of the defoaming device. In a gas replacement unit including a third pipe for recovering gas from the defoaming device and returning the gas to the gas replacement device, as well as being formed as a pipe to which the gas is connected.
A compressor that has a suction port and a discharge port and is formed as a compressor for compressing a gas.
An air chamber connected to the second pipe and formed as a buffer device for buffering the pulsation of the pump.
One end is connected to the discharge port of the compressor, and the other end is provided with a fourth pipe connected to the air chamber.
The third pipe is a gas replacement unit characterized in that the other end is connected to the suction port of the compressor. The defoaming device has a convex shape in which the cross-sectional shape of the ceiling surface inside the defoaming device projects upward in the vertical direction.
The third pipe, the gas replacement unit according to claim 1 Symbol mounting, characterized in that one end connected to the protruding end portion of the ceiling surface. A water level sensor that detects the water level inside the defoaming device,
An on-off valve that is arranged in the third pipe and is formed as a valve that opens and closes the communication state of the third pipe.
2. The invention according to claim 2 , further comprising a closing means for closing the third pipe by closing the on-off valve when the water level sensor detects a water level higher than a predetermined threshold value. Gas replacement unit.

Images