JP6080811B2 - Fish farming system - Google Patents

Description

  This invention uses a constant temperature water tank that uses underground heat to increase the amount of dissolved oxygen by directly mixing a large number of mist-like water droplets in which oxygen is dissolved without using bubbles or the like into fresh water or seawater. Cooling and heating fresh water or seawater in the aquaculture tank at low cost, and using an air lift pump that uses bubbles that do not generate noise from the bottom of the tank, the fresh water or seawater is easily pumped at low cost and supplied to the aquaculture tank for circulation. It relates to a fish farming system.

In a fish farming system, it is necessary to supply oxygen necessary for fish farming to fresh water or seawater in a fish tank. In general, oxygen is supplied to freshwater or seawater by using a pump from the air in the atmosphere or an oxygen cylinder to the bottom of the water tank through a hose. The air or oxygen sent by the hose becomes bubbles from the tip of the hose and rises in fresh water or seawater from the bottom of the water tank, and some of the bubbles dissolve in the fresh water or seawater. Or it is supplied through increasing dissolved oxygen in seawater.
Moreover, in the fish culture system, it is necessary to keep the water temperature of the aquaculture tank constant according to the type of fish to be cultivated. For example, when the temperature is maintained at around 20 degrees C., depending on the season, since the outside air temperature and the water temperature are high in the summer, cooling is necessary. On the other hand, in winter, the outside air temperature and water temperature are low, so heating is required.
As a countermeasure, digging a constant temperature water tank in the ground, putting fresh water or seawater in the constant temperature water tank, and using the fact that the underground heat is around 18-20 degrees C throughout the year, It is conceivable to set the seawater around 18 to 20 degrees C.

JP 2006-169880 A

However, when the air or oxygen in the atmosphere is forcibly sent to the bottom of the water tank through a hose or the like using a pump, the air or oxygen that is sent becomes bubbles from the tip of the hose into fresh water or seawater from the bottom of the water tank. While rising up, only some of the bubbles dissolve in fresh water or sea water, and most of them are bubbled and discharged from the surface of the fresh water or sea water to the outside. Moreover, it is known that bubbles generated in freshwater or seawater give a great deal of stress to the fish being cultured. In particular, if the bubbles are made fine in order to increase the dissolution rate of air or oxygen in fresh water or seawater, the problem arises that the freshwater or seawater becomes cloudy and further stresses the fish.
Moreover, when maintaining the water temperature of an aquaculture tank constant, using a cooling device and a heating device requires a great energy cost, and it leads directly to the cost increase of cultured fish. When digging a thermostatic water tank in the ground and using it, it is easy to be affected by atmospheric temperature unless the thermostatic water tank is dug deeply. However, on the other hand, if the constant temperature water tank is dug deeply, a large pump is required to draw fresh water or seawater from the bottom. Large pumps are expensive, increase energy costs, increase noise during use, and put a lot of stress on the farmed fish. In order to avoid this, there are other problems such as the need to install it away from the aquaculture tank.

  In view of the above-mentioned problems, the present invention has been devised to solve the problems, and the object of the present invention is a large number of fine mists in which oxygen is dissolved without depending on bubbles or the like. Water droplets are mixed directly into fresh water or seawater to increase the amount of dissolved oxygen, and the freshwater or seawater in the aquaculture tank is cooled and heated at low cost using a thermostatic water tank that uses underground heat. It is an object of the present invention to provide a fish culture system that can draw fresh water or seawater easily and at low cost by using an air lift pump that uses bubbles that do not occur and circulate and supply it to a culture tank.

In order to achieve the above object, the present invention connects the upstream side of the air introduction passage to the atmosphere introduction port, provides a compressor in the middle of the air introduction passage, cools the air, and removes moisture contained in the air. Air-cooled water droplets appearing oxygen dissolution device that makes oxygen in the air come into contact with and dissolves in fine mist-like water droplets whose surface area is much larger than the volume of water droplets. A constant temperature water tank is constructed in which the peripheral surface and bottom surface are surrounded by the ground in order to use the underground heat maintained at a constant room temperature through which circulating water consisting of fresh water or seawater flows in and out. Recirculate the circulating water in the constant temperature water tank on the downstream side of the air introduction passage, connect the downstream end to the air cooling water droplet appearing oxygen dissolving device, and create the density difference between the inside and outside of the circulating water on the bottom side by bubbles. Air riff to pump The pump is arranged vertically inside the thermostatic water tank, the suction port is provided at the lower end side of the air lift pump, the bubble removing unit is provided at the upper end side, and the upstream end side is connected to the air cooling water droplet appearing oxygen dissolving device. The upward discharge port of the gas-liquid mixed fluid introduction passage faces the downward suction port of the lower end of the air lift pump in the thermostatic water tank, and there is an aquaculture tank for fish farming. A fish culture system in which a water tank circulation passage with a filter provided in the middle is provided between the upper part of the fish tank, and the circulating water consisting of fresh water or sea water circulated and discharged from the culture water tank and filtered in the middle Flowing into the thermostatic water tank and using the underground heat around the thermostatic water tank, the circulating water in the thermostatic water tank is cooled in the summer and warmed in the winter, and is heated through the air inlet by driving the compressor. The The air is cooled with circulating water in the thermostatic water tank while flowing down the air introduction passage, and the cooled air is cooled with an air-cooled water droplet appearing oxygen dissolving device, and the moisture contained in the air is mist-like. A large number of fine water droplets appear, and each water droplet is dissolved by bringing oxygen in the air into contact therewith. A mist of fine water droplets in which oxygen is dissolved in the circulating water that is flowing into the air lift pump together with the circulating water at the bottom of the constant temperature water tank from the discharge port of the liquid mixed fluid introduction passage through the suction port. Is mixed with air bubbles and nitrogen and air bubbles are mixed to create a density difference in the circulating water inside and outside the air lift pump due to the internal bubbles, and oxygen inside the air lift pump is added and the density is low. It is characterized by pumping up circulating water, circulating and supplying it to the aquaculture tank, and supplying oxygen to fresh water or seawater in the tank.

According to the fish culture system according to the present invention comprising means for solving the problems, the following excellent effects can be achieved.
When cooling the air in the atmosphere, use the constant temperature water tank that keeps the water temperature at a constant temperature according to the underground temperature that is kept constant throughout the year. Cooling energy costs can be reduced. In addition, when oxygen is dissolved in fresh water or seawater in the aquaculture tank, when the air is cooled, the moisture contained in the air appears as mist-like fine water droplets. By utilizing the fact that part of the oxygen in the air dissolves in the water droplets, it is possible to generate mist-like fine water droplets in which oxygen is dissolved.
The mist-like fine water droplets are discharged into the thermostatic water tank, mixed with the circulating water in the thermostatic water tank, supplied to the culture water tank via the air lift pump, and become a supply source of oxygen. The device for forcibly sending oxygen or air into fresh water or seawater can be omitted, and when oxygen is dissolved in fresh water or seawater, it is mixed in the form of mist-like fine water droplets. There is no generation of bubbles that would be stressful for fish.
In addition, when the air is cooled, the oxygen in the air that did not dissolve in the mist-like fine water droplets, unlike oxygen dissolved in the mist-like fine water droplets, is removed from the air lift installed in the constant temperature water tank. It rises as bubbles together with fresh water or seawater in the pump, and is discharged into the atmosphere from the upper end side where the air lift pump opens. This released nitrogen is a gas that is a problem in fish farming, but it is prevented from being released into the atmosphere from the air lift pump as air bubbles just before being sent to the fish tank. Can do. Furthermore, since the air lift pump does not generate any driving noise such as motor noise, it does not cause stress on the cultured fish due to noise.
Bubbles contained in the circulating water are released and removed from the upper end to the outside air when the air lift pump passes through the air lift pump, so that the circulating water returned to the aquaculture tank is again bubbled. Is not included and does not cause stress to the cultured fish due to bubbles.
Fine impurities contained in the circulating water rising in the air lift pump can be removed by adhering to the surface of the bubbles due to the aeration effect of the bubbles rising in the same way in the circulating water, improving the filtration function In addition, since the contaminated water containing impurities does not recirculate, the function of purifying the water in the aquaculture tank can be enhanced, and the fish culture environment can be enhanced.
Circulating water consisting of fresh water or seawater that is recirculated to the aquaculture tank is dissolved with mist-like fine water droplets that dissolve oxygen evenly ascending inside the airlift pump without noise. Circulating water rich in oxygen is circulated and supplied to the aquaculture tank, so there is no stress on the fish. In addition, when oxygen is dissolved in the circulating water, oxygen and air are not forcibly sent using a pump or the like, so there is no generation of bubbles and no noise. It is not given to. Furthermore, since the abundant dissolved oxygen suppresses the growth of bacteria, the aquaculture tank is not contaminated and fish odor can be prevented.
In conventional aquaculture tanks, a separate cooling device is required to maintain the water temperature constant. In the present invention, a constant temperature water tank is used that maintains the water temperature at a constant temperature through the underground temperature that is maintained constant throughout the year. Therefore, a cooling device can be dispensed with. In addition, the air lift pump can pull water from a deep place by using water and bubbles having a low temperature when generating mist-like fine water droplets in which oxygen is dissolved, and at that time the temperature is low Since water is used, there is also an effect of lowering the water temperature, which can further contribute to making the cooling device unnecessary by enhancing the cooperation effect with the constant temperature water tank.

It is a fish culture system figure showing a form for carrying out this invention.

  Hereinafter, the present invention will be described more specifically based on embodiments for carrying out the invention described in the drawings.

  In the figure, a fish culture system 1 includes an air inlet 2, a compressor 3, an air introduction passage 4, an air cooling water droplet appearing oxygen dissolving device 5, a constant temperature water tank 6, an air lift pump 7, a gas-liquid mixed fluid introduction passage 8, an aquaculture. Consisting mainly of aquarium 9, etc., a large number of mist-like water droplets d in which oxygen is dissolved without any bubbles are directly mixed into fresh water or seawater to increase the amount of dissolved oxygen and use the heat in the ground The fresh water or seawater in the aquaculture tank 9 is cooled and heated at a low cost by using the constant temperature water tank 6, and the fresh water or seawater is easily lowered by using an air lift pump 7 that uses bubbles that do not generate noise from the bottom. It has the feature that it can be pumped at a cost and circulated and supplied to the aquaculture tank.

  The air introduction port 2 is a suction port for taking in air, that is, air a. The air contains oxygen and the air contains moisture, and has the property of forming mist-like fine water droplets when cooled. Furthermore, oxygen has the property of dissolving in mist-like fine water droplets. The air introduction port 2 has a wide opening, and the tip of the air introduction passage 4 is connected to the center on the back side. The air inlet 2 is attached at a position slightly higher than the ground in order to prevent the air a heated by the heat of the ground from flowing in the summer.

  A moisture evaporator 21 is attached to the lower part of the inlet of the air inlet 2 as necessary, and water is put in the moisture evaporator 21. The moisture evaporator 21 is used when it is desired to obtain many mist-like fine water droplets or when the air a is dry and the humidity is low, such as in winter. This is because when the air-cooled water droplet appearing oxygen dissolving device 5 produces fine mist-like water droplets from the air a, it is necessary to obtain many mist-like fine water droplets, Used when mist-like fine water droplets cannot be secured.

  The compressor 3 is used as power when the air a is forcibly sucked from the air inlet 2 described above. When the output of the compressor 3 is increased, the inflow amount of the air a from the atmosphere introduction port 2 increases. The compressor 3 is provided in the middle of the air introduction passage 4 immediately downstream of the air introduction port 2. Since the compressor 3 generates noise, the compressor 3 is installed at a location slightly away from the aquaculture tank 9.

  The amount of air a sucked in by the compressor 3 affects the ability of the air lift pump 7 to pump the circulating water e from the bottom of the thermostatic water tank 6 and the amount of oxygen supplied into the aquaculture tank 9. . When the inflow amount of air a increases, the pumping capacity increases and the supply amount of oxygen increases. That is, by controlling the output of the compressor 3, it is possible to control the pumping capacity of the circulating water e from the bottom of the constant temperature water tank 6 and the supply amount of oxygen into the aquaculture tank 9.

  The air introduction passage 4 is a passage for sending the air a flowing in from the air introduction port 2 to the air cooling water droplet appearing oxygen dissolving device 5, and the air a flows down inside the air cooling water drop appearing oxygen dissolving device. 5 is pumped. The upstream side of the air introduction passage 4 is connected to the atmosphere introduction port 2 as described above, and a compressor 3 is attached in the middle of the air introduction passage 4 immediately adjacent to the atmosphere introduction port 2.

  The downstream end side of the air introduction passage 4 is connected to an air cooling water droplet appearing oxygen dissolving device 5. The air introduction passage 4 on the downstream side of the compressor 3 passes through the fresh water or the seawater inside the constant temperature water tank 6 and then is connected to the air cooling water droplet appearing oxygen dissolving device 5. For example, a plastic pipe is used for the air introduction passage 4.

  The air-cooled water droplet appearing oxygen dissolving device 5 cools the air a that is forcibly sucked from the air inlet 2 so that the moisture contained in the air appears and appears as a large number of mist-like water droplets. It is a device that dissolves oxygen in the air into a large number of mist-like water droplets. Oxygen has the property of dissolving in mist-like fine water droplets d. Since the mist-like fine water droplets d have a small volume, the surface area is relatively large, the contact area with the air containing oxygen is increased, and oxygen is easily dissolved from the surface. The size of the mist-like water droplets d is at most 100 μm or less, generally about 20 μm.

  A large number of mist-like water droplets d in which oxygen is dissolved are fed into the air lift pump 7 together with nitrogen and air c, and mixed into the circulating water e made up of fresh water or sea water while rising in the air lift pump 7. It will be supplied into the aquaculture tank 9. Note that nitrogen that adversely affects the growth of fish does not easily dissolve in mist-like fine water droplets, so there is no fear that circulating water e consisting of fresh water or seawater containing nitrogen is supplied into the aquaculture tank 9.

  The air-cooled water droplet appearing oxygen dissolving device 5 has a structure in which the inside is cooled, and for example, a metal air cooling pipe 51 that easily transmits cooling heat to the inside to be cooled increases the distance. It is arranged in a wave shape. The air a flowing into the metal air cooling pipe 51 from the atmosphere introduction port 2 passes through the inside.

  For example, a cooling device is used as the air cooling water droplet appearing oxygen dissolving device 5. The air-cooled water droplet appearing oxygen dissolving device 5 is a temperature at which a large number of mist-like fine water droplets d dissolving oxygen appearing from the air a flowing through the air cooling pipe 51 are not frozen, for example, around 1 to 5 degrees C. Is set.

  While the air a flowing inside the air cooling pipe 51 of the air cooling water droplet appearing oxygen dissolving apparatus 5 is flowing down, the moisture contained in the air a appears as a large number of mist-like water droplets, A part of oxygen in the air a is dissolved in a large number of mist-like water droplets d. In this way, the inflowing air a changes into a gas-liquid mixed fluid consisting of nitrogen and air c and a large number of mist-like water droplets d in which oxygen is dissolved while flowing down between them. 6 is sent out to the air lift pump 7 in the inside.

  The constant temperature water tank 6 is a vertical hole dug in the ground, and the side peripheral surface and the bottom surface are surrounded by the ground and are in direct contact with each other, and the circulating water e made up of fresh water or seawater put in the inside is submerged. It functions to maintain around 18-20 degrees C throughout the year using heat. By using this constant temperature water tank 6, the water temperature of the circulating water e can be maintained at around 18 to 20 degrees C. Therefore, in the summer when the water temperature is high, there is no need to cool the water temperature using a cooling device. In winter when the water temperature is low, it is not necessary to warm the water temperature by using a heating device, and there is an advantage that the energy cost used for temperature adjustment of the water temperature can be suppressed as much as possible.

  The inner peripheral side surface and the bottom surface of the constant temperature water tank 6 are constructed of concrete, stone, or the like so that surrounding sand and the like do not enter the internal circulating water e. A lid or the like is appropriately attached to the open upper end of the thermostatic water tank 6 so that foreign matter does not enter. The constant temperature water tank 6 has a deep hole of about 10 to 20 m, for example, so that the internal circulating water e is not affected by the atmospheric temperature as much as possible.

  In the fresh water or seawater contained in the constant temperature water tank 6, a part of the air introduction passage 4 is immersed in a state of extending to the vicinity of the bottom and reciprocatingly detouring. The heated air b pumped inside the air introduction passage 4 is appropriately cooled while reciprocating through the fresh water or seawater inside the constant temperature water tank 6, and the air cooling water droplet expression on the downstream end side. It is sent to the oxygen exit dissolving device 5. There is an advantage that cost and time for cooling can be saved by appropriately cooling the temperature of the air b heated before being sent to the air cooling water droplet appearing oxygen dissolving device 5.

  The air lift pump 7 is a pump that pumps the circulating water e from the bottom side of the constant temperature water tank 6, and is arranged vertically inside the constant temperature water tank 6. The air lift pump 7 has a structure in which the circulating water e on the lower bottom side is pumped up using bubbles of nitrogen and air c in the gas-liquid mixed fluid sent from the air cooling water droplet appearing oxygen dissolving device 5. . Since the air lift pump 7 does not use a motor, a propeller, or the like, the air lift pump 7 has a feature that hardly generates noise. It has the advantage that it can be used even near aquariums where fish that are sensitive to noise and stress are cultivated.

  The principle of the air lift pump 7 will be described later in detail, but the density of the fresh water or sea water inside the gas-liquid mixed fluid and the density of the fresh water or sea water inside the constant temperature water tank 6 by the bubbles of nitrogen and air c are controlled. By making it smaller than the density, the structure is such that the circulating water e consisting of fresh water or seawater at the bottom of the constant temperature water tank 6 is pumped up to the upper part of the constant temperature water tank 6.

  That is, when the bubbles of nitrogen and air c in the gas-liquid mixed fluid flow from the lower end of the air lift pump 7, the density of the fresh water or sea water inside is higher than the density of the fresh water or sea water inside the constant temperature water tank 6 outside. It becomes smaller and is pushed up sequentially by high-density fresh water or seawater in the constant temperature water tank 6 flowing from the lower end. On the other hand, high-density fresh water or seawater in the thermostatic water tank 6 that flows in from the lower end of the air lift pump 7 is gradually reduced in density due to the presence of bubbles flowing in from the lower end. .

  A suction port 71 is formed at the lower end of the air lift pump 7 so as to open downward. The suction port 71 communicates the inside of the air lift pump 7 with the external constant temperature water tank 6. Circulating water e made of fresh water or seawater at the bottom of the thermostatic water tank 6 is sucked from the suction port 71 mixed with mist-like fine water droplets d in which bubbles and oxygen are dissolved.

  A bubble removing unit 72 is provided at the upper end of the air lift pump 7. The bubble removing unit 72 opens toward the atmosphere. The bubble removing unit 72 discharges bubbles made of nitrogen and air c mixed in the circulating water e made of fresh water or seawater pumped from the bottom of the thermostatic water tank 6 to the atmosphere, and circulated water e circulated and supplied to the aquaculture tank 9 It functions to prevent air bubbles from being mixed in the air.

  A discharge passage 73 is provided on the side surface on the upper end side of the air lift pump 7. The discharge passage 73 is a passage through which the circulating water e pumped up in the air lift pump 7 is discharged to the outside. The discharge passage 73 is provided above the constant temperature water tank 6. The discharge passage 73 extends laterally from the side surface on the upper end side of the air lift pump 7, and the tip end side is bent downward and is immersed in the aquaculture tank 9. Circulating water e in which oxygen is dissolved while the air lift pump 7 is being pumped and fine foreign matters are removed by bubbles is returned to the aquaculture tank 9 through the discharge passage 73.

  By the way, when the front end side of the discharge passage 73 of the air lift pump 7 is submerged in fresh water or seawater of the aquaculture tank 9, the fresh water or seawater in the aquaculture tank 9 is kept at a constant temperature through the air lift pump 7 according to the principle of siphon. It flows backward to the water tank 6 side. The bubble removing unit 72 opened to the atmosphere provided on the upper end side of the air lift pump 7 also functions to prevent this backflow due to the siphon principle.

  The gas-liquid mixed fluid introduction passage 8 is a fluid that has been changed from air a to nitrogen-air c and mist-like fine water droplets d in which oxygen is dissolved in the air-cooled water droplet appearing oxygen dissolving device 5. The gas-liquid mixed fluid flows down this interior and is sent out toward the suction port 71 of the air lift pump 7. The upstream end side of the gas-liquid mixed fluid introduction passage 8 is connected to the downstream end side of the air cooling pipe 51 of the air cooling water droplet appearing oxygen dissolving device 5.

  The downstream side of the gas-liquid mixed fluid introduction passage 8 extends to the bottom side inside the thermostatic water tank 6, and a discharge port 81 is provided at the downstream end thereof. The discharge port 81 is arranged upward, and the upward discharge port 81 of the gas-liquid mixed fluid introduction passage 8 is a downward suction port of the lower end of the air lift pump 7 disposed in the constant temperature water tank 6 in the vertical direction. It is facing 71. The gas-liquid mixed fluid discharged from the discharge port 81 flows into the air lift pump 7 from the suction port 71.

  The gas-liquid mixed fluid introduction passage 8 is covered with a heat insulating material, and is cooled to a predetermined temperature at which mist-like fine water droplets are not frozen to prevent the gas-liquid mixed fluid passing through the inside from being warmed. Yes. That is, when the gas-liquid mixed fluid passes through the passage 8 and is warmed by the outside air and fresh water or seawater inside the thermostatic water tank 6, the atomized fine water droplets d in which oxygen is dissolved evaporate, and only the air again It is preventing to return to the state of. For example, a plastic pipe is used for the gas-liquid mixed fluid introduction passage 8.

  The aquaculture tank 9 is a tank for cultivating various fish. Fresh water or seawater is placed in the aquarium, and various cultured fish are bred in the freshwater or seawater. A water tank discharge port 91 for circulating and discharging old fresh water or seawater is provided at the center bottom of the aquaculture water tank 9. The water tank discharge port 91 is provided with a water tank waste extraction cylinder 92 for taking out the waste f contained in the discharged fresh water or seawater.

The upstream end of the water tank circulation passage 93 is connected to the water tank discharge port 91. The downstream side of the water tank circulation passage 93 is connected to the side surface side of the upper water surface of the constant temperature water tank 6. Further, in the middle of the water tank circulation passage 93, a filter 94 is provided for filtering and removing dirt, impurities, foreign matter g, etc. contained in the circulating water e made of fresh water or sea water discharged from the water tank outlet 91. Yes.

Next, the operation based on the configuration of the embodiment for carrying out the invention will be described below.
When the compressor 3 constituting a part of the fish culture system 1 is started, the air a is forcibly sucked from the atmosphere through the atmosphere inlet 2 by the action of the compressor 3. The sucked air a is pressurized by the compressor 3 at the time of suction, and the air temperature is also heated by being pressurized.

  The heated air b is sent to the constant temperature water tank 6 through the inside of the air introduction passage 4 connected to the compressor 3. The upstream side of the air introduction passage 4 is connected to the compressor 3, the downstream side is connected to an air cooling water droplet appearing oxygen dissolving device 5, and an intermediate part thereof is circulated in fresh water or seawater in the constant temperature bath 6. ing. For this reason, the heated air b in the air introduction passage 4 is cooled by fresh water or seawater while passing through the constant temperature water tank 6.

  The temperature of the heated air b is lowered to about room temperature, which is the temperature of fresh water or seawater in the thermostatic water tank 6. The constant temperature water tank 6 is provided by being dug from the ground toward the ground, and is surrounded by the ground except for the upper end surface where the constant temperature water tank 6 opens. For this reason, the temperature of the fresh water or seawater in the thermostatic water tank 6 is maintained at a room temperature, that is, a room temperature of around 18 to 20 degrees C throughout the year.

  The normal temperature of fresh water or seawater in the thermostatic water tank 6 is slightly higher in the summer than in the winter. Moreover, it is slightly different depending on the region where the constant temperature water tank 6 is installed. For example, when the outside air temperature in summer is 35 degrees C., the temperature of the air a just before flowing into the air cooling water droplet appearing oxygen dissolving apparatus 5 is cooled by fresh water or seawater in the constant temperature water tank 6, so that it is around 20 degrees C. Go down.

  The air a, which has been lowered to about room temperature while passing through the air introduction passage 4 provided in the constant temperature water tank 6, is atomized by the next air cooling water droplet appearing oxygen dissolving device 5 provided downstream thereof. It is cooled to a predetermined temperature such that very fine water droplets do not freeze, for example, around 1 to 5 degrees C. That is, the air-cooled water droplet appearing oxygen dissolving device 5 is cooled by lowering the temperature of the air a, but the temperature is controlled so as not to cool the mist-like minute water droplets that appear. The temperature control of the air-cooled water droplet appearing oxygen dissolving device 5 is different between the summer season when the outside air temperature is high and the winter season when it is low.

  When the air a is cooled to a predetermined temperature by the air-cooled water droplet appearing oxygen dissolving device 5, a part of the water in the air a appears as mist-like fine water droplets d. A part of the oxygen in the air a dissolves in the mist-like fine water droplets that appear. At this time, nitrogen in the air a does not dissolve in the appearing mist-like minute water droplets. While passing through the air-cooled water droplet appearing oxygen dissolving device 5, the air a is changed to a gas-liquid mixed fluid composed of nebulized fine water droplets d in which oxygen in the air a is dissolved, nitrogen and air c. To do.

  The gas-liquid mixed fluid changed from the air a in the air cooling water droplet appearing oxygen dissolving device 5 is sent out through the gas-liquid mixed fluid introduction passage 8 toward the bottom side inside the constant temperature water tank 6, and the discharge port 81 at the downstream end thereof. Discharged from. The discharged gas-liquid mixed fluid is sucked from the suction port 71 at the lower end of the air lift pump 7 and is mixed with the circulating water e made of fresh water or seawater and rises in the air lift pump 7.

  The circulating water e rising in the air lift pump 7 is mixed with mist-like fine water droplets d in which oxygen of the gas-liquid mixed fluid is dissolved, so that a large amount of oxygen is contained in the rising circulating water e. It will be dissolved and included. Similarly, nitrogen and air c in the gas-liquid mixed fluid become bubbles and rise in the air lift pump 7 together with the circulating water e. While the bubbles are rising together with the circulating water e, oxygen is added to the rising circulating water e composed of fresh water or seawater in order to appropriately stir the circulating water e and the mist-like fine water droplets d dissolving oxygen. Is uniformly dissolved.

  The upper pressure increase of the circulating water e in the air lift pump 7 is brought about by the atmospheric suction force by the compressor 3. When the pressure of the compressor 3 is high, the amount of bubbles of nitrogen and air c in the gas-liquid mixed fluid discharged from the discharge port 81 of the gas-liquid mixed fluid introduction passage 8 increases. The increased amount of nitrogen and air bubbles of air c flows from the suction port 71 of the air lift pump 7 and rises inside thereof to increase the suction force of the air lift pump 7.

The principle of the suction force of the air lift pump 7 is as follows.
As the bubbles of fresh water or seawater inside the air lift pump 7 increase, the average density of the fresh water or sea water inside the air lift pump 7 becomes smaller than the average density of fresh water or sea water in the external constant temperature water tank 6. The fluid has the property of moving from the higher density to the lower density. The inside and outside of the air lift pump 7 communicate with each other through a suction port 71 at the lower end of the air lift pump 7.

  For this reason, fresh water or seawater with a high density in the external constant temperature water tank 6 flows into the low density air lift pump 7 through the suction port 71 of the air lift pump 7, that is, is sucked. The sucked fresh water or seawater with a high density is reduced in density by mixing bubbles continuously discharged from the gas-liquid mixed fluid introduction passage. Since fresh water or seawater with high density continues to flow in from the suction port 71 at the lower end of the pump, the fresh water or seawater with reduced density rises in the inside so as to be pushed up, and is discharged from the upper end side to raise fish. It is circulated in the system 1.

By the way, the average density of fresh water or seawater inside the air lift pump 7 is τ ₁ , and the height from the suction port 71 at the lower end of the air lift pump 7 to the fresh water surface or sea water level inside the air lift pump 7 is h ₁ . To do. Further, the average density of fresh water or seawater in the constant temperature water tank 6 outside the air lift pump 7 is τ, and from the suction port 71 at the lower end of the air lift pump 7 to the fresh water surface or sea water surface of the constant temperature water tank 6 outside the air lift pump 7. Let the height be h.
At this time, since the inside of the air lift pump 7 and the outside of the periphery communicate with each other through the suction port 71 at the lower end,
τ ₁ · h ₁ = τ · h
Is established. If this equation is transformed,
h ₁ = (τ / τ ₁ ) · h
It becomes.
Moreover, since the average density τ ₁ of fresh water or seawater inside the air lift pump 7 is smaller than the average density τ of fresh water or sea water in the constant temperature water tank 6 outside the air lift pump 7, τ ₁ <τ. That is, since (τ / τ ₁ )> 1,
h ₁ = (τ / τ ₁ ) · h> 1 · h
That is, h ₁ > h
From this, it can be seen that the fresh water surface or sea water surface with a low density inside the air lift pump 7 has a higher water level than the fresh water surface or sea water surface within the constant temperature water tank 6 with a high density outside. This is easily understood if you think of the ice floating in the water. The top surface of ice is slightly higher than the water surface, but ice has a lower density than water. In this manner, the air lift pump 7 can pump the circulating water e made of fresh water or seawater at the bottom of the constant temperature water tank 6 to the upper side from the constant temperature water tank 6.

And the water level difference between the fresh water surface or sea water surface inside the air lift pump 7 and the constant temperature water tank 6 outside thereof can be controlled by adjusting the average density τ ₁ of the fresh water or sea water inside the air lift pump 7. I understand. That is, the amount of bubbles discharged from the discharge port 81 of the gas-liquid mixed fluid introduction passage 8 can be adjusted. The discharge amount of the bubbles is controlled by the atmospheric suction force by the compressor 3 described above.

  Further, the bubbles of nitrogen and air c in the gas-liquid mixed fluid discharged from the discharge port 81 of the gas-liquid mixed fluid introduction passage 8 differ depending on the air-cooled water droplet appearing oxygen dissolving device 5 in summer and winter. It has been cooled to around -10 degrees C. While these rise in the air lift pump 7, they are warmed by fresh water or seawater maintained at a room temperature of about 18 to 20 degrees C inside the thermostatic water tank 6. The bubbles of warmed nitrogen and air c are expanded in volume, so that they become lighter and increase in raising force, and work to increase the rising pressure by reducing the density of the surrounding circulating water e.

  In addition to this, the circulating water e consisting of fresh water or seawater rising inside the air lift pump 7 is aerated by the rising bubbles of nitrogen and air c. That is, it is removed by adhering fine foreign substances contained in the circulating water e to the surface of the bubbles. The air lift pump 7 also performs a filtration function and increases the filtration of the circulating water e.

  A large amount of bubbles of nitrogen and air c that have pushed up circulating water e made of fresh water or seawater to the upper end side of the air lift pump 7 are provided at the upper end of the air lift pump 7 and open to the atmosphere. From the atmosphere.

  In addition, fine foreign matter removed from the rising circulating water e due to the aeration action of the bubbles floats on the fresh water surface or the sea water surface of the bubble removing unit 72. Is done.

  Furthermore, the bubble removing unit 72 opened to the atmosphere provided on the upper end side of the air lift pump 7 causes the fresh water or seawater in the aquaculture tank 9 to flow back into the constant temperature water tank 6 through the air lift pump 7 according to the principle of siphon. Is preventing.

  Circulating water e consisting of fresh water or seawater that has risen to the upper end side of the air lift pump 7 and from which bubbles have been removed is discharged to the outside of the air lift pump 7 from a discharge passage 73 provided on the side surface on the upper end side, and from there Although it is recirculated and supplied to the aquaculture tank 9, foreign matters are removed and filtered during the circulation and air bubbles are removed, so that the fish is not stressed by air bubbles.

  While circulating water e consisting of fresh water or seawater recirculated and supplied from the discharge passage 73 to the aquaculture tank 9 circulates in the constant temperature water tank 6, the temperature of the fresh water or seawater in the constant temperature water tank 6 is in the ground. Since it is cooled to room temperature, for example, around 18 to 20 degrees C throughout the year, a dedicated cooling device can be dispensed with.

  Circulating water e made up of fresh water or seawater supplied by recirculation to the aquaculture tank 9 has a large number of mist-like water droplets d in which oxygen is dissolved while ascending inside the air lift pump 7. In addition, since the circulating water e rich in dissolved oxygen is circulated and supplied to the aquaculture tank 9, no stress is given to the fish.

  Moreover, when oxygen is dissolved in the circulating water e, oxygen or air is not forcibly sent using a pump or the like, so that no bubbles are generated and stress due to the bubbles is not given to the fish. Furthermore, since the abundant dissolved oxygen suppresses the growth of bacteria, the aquaculture tank 9 is not contaminated and fish odor can be prevented.

  In the aquaculture tank 9, new circulating water e is supplied, while old fresh water or seawater in the tank is appropriately discharged from the tank discharge port 91 to the tank circulation passage 93 and filtered by a filter 94 in the middle. Then, it is circulated and discharged from the upper side of the constant temperature water tank 6 to the inside thereof. The circulating water e discharged from the upper side into the constant temperature water tank 6 is cooled while sinking toward the bottom of the constant temperature water tank 6, and is sucked from the suction port 71 of the air lift pump 7 from the bottom side. Oxygen is supplied through mist-like fine water droplets d in which oxygen is dissolved during ascending, and the same circulation as described above is repeated thereafter.

  The present invention is not limited to the embodiment for carrying out the invention, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Fish culture system 2 Air inlet 21 Moisture evaporator 3 Compressor 4 Air introduction passage 5 Air cooling water drop appearing oxygen dissolution apparatus 51 Air cooling pipe 6 Thermostatic water tank 7 Air lift pump 71 Intake port 72 Bubble removal part 73 Exhaust passage 8 Air Liquid mixed fluid introduction passage 81 Discharge port 9 Aquaculture tank 91 Aquarium discharge port 92 Aquarium garbage extraction tube 93 Aquarium circulation passage 94 Filter a Air b Heated air c Nitrogen and air d Oxygen dissolved fine water droplets e Circulating water consisting of fresh water or seawater f Garbage contained in fresh water or seawater g Dirt, impurities, foreign matter contained in circulating water

Claims (2)

Connect the upstream side of the air introduction passage to the atmosphere introduction port, provide a compressor in the middle of the air introduction passage, cool the air, and make the moisture contained in the air appear as mist-like fine water droplets and compare with the volume An air-cooled water drop appearing oxygen dissolving device that dissolves oxygen in the air in contact with mist-like fine water droplets whose surface area has become remarkably wide has been established to maintain heat at a constant temperature throughout the year. A constant temperature water tank is constructed in which the side peripheral surface and bottom surface are surrounded by the ground to be used and circulating water consisting of fresh water or seawater flows in and out, and the downstream side of the air introduction passage is connected to the circulating water in the constant temperature water tank. The air lift pump that pumps the circulating water on the bottom side by creating a density difference between inside and outside due to bubbles is arranged vertically inside the constant temperature water tank. Shi A suction port is provided on the lower end side of the air lift pump, a bubble removing part is provided on the upper end side thereof, and an upward discharge port of the gas-liquid mixed fluid introduction passage connected to the air cooling water droplet appearing oxygen dissolving device on the upstream end side is provided. , Facing the downward inlet of the lower end of the air lift pump in the thermostatic water tank, installing an aquaculture tank for fish culture, and installing a filter in the middle between the aquarium water outlet and the upper part of the thermostatic tank A fish aquaculture system provided with an aquarium circulation passage,
Circulating water consisting of fresh water or seawater that is circulated and discharged from the aquaculture tank and filtered in the middle flows into the constant temperature water tank from above, and uses the underground heat around the constant temperature water tank to circulate the water in the constant temperature water tank. The air is cooled in the summer and warmed in the winter. The warmed air introduced through the air inlet by the drive of the compressor is cooled down with the circulating water in the constant temperature water bath while flowing down the air introduction passage, and the cooled air is cooled by air cooling water droplets. Oxygen dissolved in the air by dissolving the air in the air-dissolving device to cause the water contained in the air to appear as a large number of mist-like water droplets. A gas-liquid mixed fluid consisting of a large number of mist-like water droplets and the remaining nitrogen and air is allowed to flow into the air lift pump together with the circulating water at the bottom of the thermostatic water tank from the discharge port of the gas-liquid mixed fluid introduction passage through the suction port. ,air The water inside the lift pump is mixed with mist-like fine water droplets with dissolved oxygen in the circulating water that is rising, oxygen is added, and air bubbles of nitrogen and air are mixed. A difference in density is created in the circulating water, and oxygen in the air lift pump is added, pumping up the circulating water with a low density, circulatingly supplying it to the aquaculture tank, and supplying oxygen to fresh water or seawater in the tank Fish farming system. The fish culture system according to claim 1, wherein the gas-liquid mixed fluid introduction passage is covered with a heat insulating material that prevents the gas-liquid mixed fluid passing through the gas-liquid mixed fluid passage from being warmed.

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