JP3771231B2 - Aeration equipment for fish tanks - Google Patents

Description

  The present invention relates to an aeration apparatus for a fish tank. Particularly, the present invention relates to an aeration apparatus for a fish tank for circulating water between a filtration tank located at an upper part.

  In a fish tank for fish and shellfish, especially goldfish and tropical fish, it is necessary to use a filtration device because the water quality deteriorates due to ammonia generation from seafood excrement. Furthermore, (2) in order to supplement the amount of oxygen in the water consumed by the respiration of seafood, it is also necessary to mix air into the water in the aquarium using an air pump. In view of the above two requirements, an aeration apparatus that combines a filtration device and an air pump has been conventionally used for a fish tank. The aeration apparatus is generally called an aeration apparatus or an aeration system.

FIG. 15 shows a conventional so-called upper filtration tank type aeration apparatus.
First, based on FIG. 15, the structure of the conventional upper filtration tank type air mixing apparatus is demonstrated.
The water tank 10 is covered with a water tank lid 11, and a filtration tank 20 is integrally installed on the water tank lid 11. The filtration tank 20 is divided into a filter medium chamber 20a and a water purification chamber 20b, both of which are connected by a purified water discharge port 25. The filter medium chamber 20 a is loaded with a filter medium 21 such as a wool mat, while the water purification chamber 20 b stores water filtered in the filter medium chamber 20 a (hereinafter referred to as “purified water”) and falls from the falling water pipe 26. It has become. Further, an air feed pipe 41 led from the air pump 40 passes through the water tank lid 11 in the water purification chamber 20 b and is connected to an air stone 42 located at the bottom of the water tank 10. Further, a pumping pump 30 is attached on the water tank lid 11 at a position away from the filtration tank 20.

Next, the water circulation and air mixing path in FIG. 15 will be described.
The arrows in FIG. 15 indicate the direction of water flow. Water in the water tank 10 passes through the pumping pump chamber 30 c via the strainer 31, and is poured from above into the filter medium chamber 20 a from the discharge port of the water supply pipe 33. The water filtered through the filter medium 21 passes through the saw 22 and then passes through the purified water discharge port 25 provided at the bottom of the filter medium chamber 20a and is stored in the purified water chamber 20b. Thereafter, the purified water that has reached the water level at the upper end of the falling water pipe 26 passes through the falling water pipe 26 and returns to the water tank 10 while entraining nearby air. In that case, air mixes in the water in the water tank 10, and supply of dissolved oxygen is performed.

However, only the amount of air mixed by the falling water pipe 26 is usually insufficient to compensate for the amount of dissolved oxygen consumed by the respiration of seafood in the aquarium 10.
For this reason, it is a common practice to mix fresh outside air into the water in the water tank 10 using the air pump 40 in conjunction with air mixing by the falling water pipe 26. Specifically, the outside air taken in by the air pump 40 is sent to the air stone 42 through the air feed pipe 41 and mixed into the water in the water tank 10. The air stone 42 is usually obtained by processing fine sand into a pumice shape, and has a function of releasing fine air bubbles into water. In FIG. 15, the shape of the air stone 42 is depicted as a sphere, but there are actually various shapes such as a cylindrical shape.

  In the above-described conventional upper filtration tank type aeration apparatus, it is necessary to take an AC power source through the power cord 40a and keep the air pump 40 operating all day. However, in the vibrator type air pump which is generally used, since the air is compressed and sent by vibrating a rubber called a diaphragm with an electromagnet, the vibration noise is intense and the noise source is much larger than that of the pump 30. Become. Especially at night, this vibration noise is worrisome and it can be uncomfortable not only for seafood but also for humans. Furthermore, there is a problem that the electricity bill is increased.

A device for forcibly mixing air into the water in the water tank 10 without using the air pump 40 as a noise source is disclosed in Patent Documents 1 and 2 and the like. However, all of the devices adopt a method in which a branch portion is provided on the discharge side of the pumping pump chamber 30c and air is mixed into the discharge water from the pumping pump chamber 30c.
As a representative example, an embodiment of Patent Document 2 is shown in FIG. The outside air taken in from the valve unit 62 passes through the bubble mixing nozzle 43 and is discharged from the water supply pipe 33 as water mixed with bubbles having a fine particle diameter (hereinafter referred to as “bubble water”).

Further, in the filtration tank 20 in the conventional upper filtration tank type aeration apparatus shown in FIG. 15, generally, water sent to the filter medium chamber 20 a is poured from the upper part of the filtration tank 20. The water continues to pass downward through a so-called horizontal filter medium chamber 20a formed by laminating a plurality of flat filter media 21 in the vertical direction, and is stored in the water purification chamber 20b.
5-64476 JP 7-31326 A

  The conventional upper filtration tank type aeration apparatus shown in FIG. 15 causes water to fall on the surface of the water immediately below the falling pipe 26, so that the water in the tank is swirled with a bash bash and turbulent flow occurs around the falling point. Formed, the seafood in the aquarium cannot settle. Of course, among the upper filtration type aeration devices, there is a type in which the lower end portion of the falling water pipe 26 is positioned slightly below the liquid surface of the water. The problem of turbulent flow still exists.

Further, problems such as noise caused by the air pump 40 used in combination with the falling water pipe 26 can be solved by the devices described in Patent Documents 1 and 2, etc., but in the device, the mechanism for mixing air is the pump 30. Therefore, there is a problem that the position of the discharge port of the bubbling water is restricted by the position of the pump 30. Moreover, since it is the structure which branches the discharge port of one pumping pump 30 to two thru | or more, there also exists a problem that pumping efficiency falls. In this case, since the water flow circulating in the aquarium 10 is not sufficiently formed, the water in the aquarium 10 is stagnated, leading to deterioration of the environment for fish and shellfish.
Further, since the filter media 21 of the conventional upper filtration tank type aeration apparatus shown in FIG. 15 are stacked in the vertical direction, when clogging starts, the filter media in the upper layer compresses the filter media in the lower layer, and the filter media are increasingly clogged. There is also a problem that is accelerated.
The present invention was devised as a solution to the above-described problems, and the problem to be solved by the present invention is to easily create a bubbly water flow using siphon action and to provide sufficient dissolved oxygen for fish and shellfish. Is to provide a comfortable aquarium environment.

In order to solve the above problems, the present invention takes the following means.
First, the aeration apparatus for a seafood tank according to the first invention takes the following means. That is, a water tank that can store water inside, a filtration tank that is installed at a position higher than the liquid level of the water in the water tank, and a water pumping device that pumps the water in the water tank to the filtration tank, It consists of a return device that returns the water filtered by the filtration tank back to the water tank. The water in the water tank is circulated between the filtration tank and filtered, and dissolved oxygen is supplied when the water is returned from the filtration tank to the water tank. In the fish and fish tank, the return device has a flow path configuration in which water is dropped by a siphon action, and external air is sucked into a part of the flow path by the siphon action. The air intake path that takes in and forms a bubbly water flow is connected to the flow path. Here, the “aquarium” is a container made of glass or resin for containing seafood in the water, and if it is for appreciating seafood, its side surface is preferably made of a transparent material. The “filter tank” is a container for filtering water having a filter medium such as a wool mat or an activated carbon filter inside. Although the material of the container of a filtration tank may be glass or resin, in order to promote the activity of filtration bacteria, a transparent material is good for the lid and the side surface. A “pumping device” is a pump that can take in water from a suction port at a low position and drain it from a discharge port at a high position, usually using pressure obtained by rotation of a motor, and is composed of, for example, a centrifugal pump. This applies to the pumping pump. The “return device” is a device that drops the water filtered by the filtration tank, that is, purified water, and returns it to the water tank, and corresponds to, for example, a pump having a discharge port for discharging purified water.
According to the first aspect of the present invention, it is possible to forcibly guide the bubbly water flow into the water tank by the siphon action and supply sufficient dissolved oxygen to the water in the water tank without using a separate air pump.

  Next, the aeration apparatus for a fish tank according to the second invention takes the following means. That is, the aeration apparatus for a fish tank according to the first aspect of the present invention, wherein the flow path structure of the return device is formed by a pipe, and the pipe is located at a position below the surface of the water in the tank Return holes are formed in at least two places, a relatively high position near the liquid level and a relatively low position near the bottom of the water tank.

According to the second aspect of the present invention, the effects described in detail below can be obtained.
At the position below the liquid level of the water tank, water pressure is applied to the return hole by the water in the water tank, and the water pressure becomes higher as it is closer to the bottom surface of the water tank. Since this water pressure acts as a resistance to the water flow discharged from the return hole, in order to obtain a sufficient bubble water flow due to the siphon action even at the bottom surface, it is usually necessary to increase the difference between the water tank and the filtration tank. . However, if there are return holes in at least two positions, a relatively high position close to the liquid level and a relatively low position close to the bottom of the water tank to the extent that siphon action can be easily established, the drop needs to be increased. Disappear. That is, the siphon action first establishes a sufficient water flow to form a bubbly water flow in the relatively high return hole, and then the water flow becomes priming water and is sufficient in the relatively low return hole. Water flow is established.
Therefore, it is possible to easily establish a water flow sufficient to form a bubbly water flow even at a relatively low position near the bottom surface of the aquarium, leading to a bubbly water flow in which sufficient air is mixed even near the bottom surface of the aquarium. It becomes possible.

The aeration apparatus for a fish tank according to the third aspect of the present invention takes the following means. That is, in the aquarium apparatus for fishery products according to the second or third aspect of the invention, the air intake path is formed in a tubular shape with a closed end, and the end of the tubular shape is An air intake hole is formed on the circumference, and the suction sound when air is taken into the tube shape is weakened.
According to the third aspect of the invention, since the wind noise of the air sucked in from the air intake hole is weakened, the problem of noise is avoided.

The aeration apparatus for a seafood tank according to the fourth aspect of the present invention takes the following means. That is, in the fish tank aeration apparatus according to any one of the first to third inventions described above, the filtration tank is configured so that the thickness direction of the flat filter medium coincides with the horizontal direction. It is a structure in which a plurality of filters are arranged in parallel, and has a flow path configuration in which water is filtered while traversing the plurality of filter media arranged in parallel substantially horizontally.
According to the fourth aspect of the invention, the layered structure of the filter media is a so-called vertical type, and even when clogging starts, the pressure of the filter media in the other layers above is not applied, so that the filter media is hardly compressed.

The present invention can obtain the following effects by taking the above-described means.
First, according to the first invention, since the siphon action is applied to the flow of water from the filtration tank to the water tank, the inside of the water tank is compulsorily used without using a return device with an electric motor such as a pump with a motor. You can drain the water back into it. Furthermore, since air from the outside can be mixed into the water flow to guide the bubbly water flow into the water tank, the present invention alone can supply sufficient dissolved oxygen to the water in the water tank.

  Moreover, according to 2nd invention, a bubble water flow can be easily guide | induced to a water tank also in the position close | similar to the bottom face of a water tank where the water pressure by the water in a water tank is high. Thereby, the effect similar to the air mixing from the bottom surface by the air stone in the conventional upper filtration tank type air mixing device can be obtained without an air pump.

  Furthermore, according to the third aspect of the invention, wind noise generated by forcibly taking in air from an air intake having a small diameter is weakened. Thereby, it becomes possible to use this invention continuously without the discomfort of a noise.

  Finally, according to the fourth invention, the filter medium is less likely to be compressed, and the filth adhering to the filter medium becomes fine particles due to the decomposition force of the filter bacteria and settles to the lower part, so that the filter medium is not easily clogged. Become. This has the advantage of reducing the number of cleanings.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an aeration device for a fish tank according to the present invention will be described below with reference to the drawings. In this case, the fish tank for seafood is assumed to be an aquarium for ornamental fish made of glass or transparent resin used in general households.

The first embodiment is shown in FIG. FIG. 1 is a perspective view of the entire aeration apparatus according to the present embodiment, partially broken away. In addition, the same number is attached | subjected about the same member as the member shown in FIG. 15 mentioned above.
As shown in FIG. 1, the aeration apparatus of the present embodiment is grouped into a single casing 12 that can be mounted on a lid at the top of the water tank. The housing 12 is made of a resin such as an acrylic resin plate, and is formed by integrally bonding plate materials.

  First, the housing 12 is roughly divided into three areas. From the left in FIG. 1, there are a pumping area 12a, an aeration area 12b, and a filtration area 12c. Although the housing 12 can be covered with a lid, the area including the air intake hole 61a is open to the outside air for the convenience of taking outside air from the air intake hole 61a and for the convenience of air cooling of the pump 32 for the pump. Need to be.

  In addition, although the pumping area 12a and the air mixing area 12b are arrange | positioned adjacently in a present Example, you may make the pumping area 12a adjoin the filtration area 12c. By changing the arrangement of the pumping area 12a and the aeration area 12b, the position of the strainer 31 that is the water suction port and the position of the return hole 53 that is the discharge port in the water tank 10 are changed, so that the water flow direction in the water tank 10 is changed. It is possible to have a certain width. In this embodiment, the discharge water from the return hole 53 is made to flow in the direction of water flow that is circulated once along the inner side wall in the water tank 10 and then sucked into the strainer.

  Next, the configuration of each of the three areas will be described. In addition, components such as a flange joint for joining the housing 12 and pipes penetrating the housing 12 are not shown. Moreover, the material of pipes is a hard resin material generally used as a member constituting a fish tank such as a vinyl chloride resin.

(1) First, the pumping area 12a will be described.
A motor shaft 30b and a water supply pipe 33 of the pumping pump 30 pass through the bottom surface of the pumping area 12a. The water sucked from the strainer 31 is pulled up to the pumping pump chamber 30c through the water absorption pipe 32, and is sent to the filtration area 12c through the water supply pipe 33. Here, the pump 30 is a centrifugal pump that pumps water in the axial direction and discharges it in the radial direction, and is configured to be driven by the pump 30a for pumping pump via the motor shaft 30b. The reason why the strainer 31 is attached to the water inlet of the water absorption pipe 32 is to prevent the appreciation fish from being sucked by the pump 30. In this embodiment, the strainer 31 is treated as the same part as the water inlet of the water absorption pipe 32.

(2) Second, the aeration area 12b will be described.
An overflow pipe 70 and a return pipe 52 pass through the bottom surface of the aeration area 12b. In the overflow pipe 70, the water in the aeration area 12 b overflows from the aeration area 12 b and the filtration area 12 c without returning from the return pipe 52 into the water tank 10 due to problems such as clogging of the return pipe 52. Is provided to avoid. That is, it is provided for emergency use.

  Here, based on FIGS. 2 and 3, the vicinity of the return pipe 52 and the siphon cap 51 installed at the upper end of the return pipe 52 will be described. FIG. 2 is a side sectional view of the aeration part, and FIG. 3 is a plan view thereof. In FIG. 2, for convenience of illustration, the joint pipe 63 bent and used in FIG. 1 is drawn in a straight line.

  The air amount adjusting valve unit 62 is integrally configured around a valve 62c that can adjust the flow rate of air by a cock 62d, and has a valve inlet 62a at one end and a valve outlet 62b at the other end. . The valve inlet 62a penetrates the side surface of the housing 12 and is exposed to the outside air. The valve 62c only needs to be able to adjust the flow rate of air, and its type is arbitrary. In this embodiment, a ball type valve provided with a rod-shaped cock 62d is used. Further, when the air flow rate is adjusted by the valve 62c, the size of the bubble particles in the bubble water discharged from the return hole 53 also changes, so that the valve 62c substantially has a bubble particle size adjusting function. In this case, when the air flow rate is increased, the bubble particle size is increased, and when the air flow rate is decreased, the bubble particle size is decreased.

  A rubber or resin air intake cap 61 having a tubular shape with one end closed is fitted into the valve inlet 62a. Several pinhole-shaped air intake holes 61 a are formed on the side surface circumference of the air intake cap 61. On the other hand, an air discharge pipe 64 is attached to the valve outlet 62b by a flexible joint pipe 63 made of rubber or resin. The air discharge pipe 64 extends from the joint pipe 63 and is bent vertically downward. The air discharge pipe 64 passes through the closed end side of the tube-shaped siphon cap 51 whose upper end is a closed end, and slightly passes to the upper open end 52a of the return pipe 52. Its tip extends to the position where it enters. The siphon cap 51 is provided with a screw hole so that the mounting screw 54 can be screwed from the side. The siphon cap 51 is fixed to the return pipe 52 by mounting screws 54 from three directions.

  The front end of the air discharge pipe 64 has a closed tube shape, and several pinhole-shaped air discharge holes 65 are arranged in the circumferential direction on the side surface of the air discharge pipe 64. Although the number of the air discharge holes 65 is arbitrary, the larger the number, the smaller the bubble particle size in the bubble water from the return hole 53, and the bubble water containing many bubble particles can be obtained. Therefore, when the air discharge hole 65 is made of a sponge-like porous material, a large number of bubble particles are mixed in the water, and dissolved oxygen is easily obtained. Note that the positional relationship between the air discharge hole 65 and the upper open end 52a of the return pipe 52 greatly affects the amount of air mixed in, but this positional relationship uses the mounting screw 54 to determine the relative position of the siphon cap 51 and the return pipe 52. Decide by fine-tuning. Further, as shown well in FIG. 2, when the cross-sectional shape in the longitudinal direction of the upper open end 52 a of the return pipe 52 is made acute, water easily enters the return pipe 52.

  The return pipe 52 extends through the bottom of the housing 12 and the water tank lid 11 into the water tank 10, and has an opening on the side surface at a position about 20 to 30 mm below the liquid level of water in the water tank 10. A return hole 53a is formed. The lowermost portion of the return pipe 52 is bent into an L shape, and the return hole 53b serving as the lower open end faces the same direction as the return hole 53a. In addition, although the direction of the return hole 53a and the return hole 53b may differ, in the present Example, in order to form a uniform water flow in the whole water tank 10, it arranges in the same direction.

  Further, the return pipe 52 is provided with an air vent hole 55 at a position above the liquid level of water in the water tank 10 and exposed to air. This is because the water level rises in the aeration area 12 b and reaches the lower end of the siphon cap 51 and flows into the return pipe 52 in the initial stage of circulating water to the aeration apparatus according to the present embodiment. This is provided when water is difficult to flow into the return pipe 52 due to air trapped in the system composed of the siphon cap 51 and the return pipe 52. Therefore, when the air accumulated in the system escapes from the return hole 53a, for example, it is not necessary to provide it. The diameter of the air vent hole 55 is extremely small, and the amount of water leaking from here is negligible compared to the amount of water discharged from the return holes 53a and 53b.

(3) Third, the filtration area 12c will be described.
As well shown in FIG. 1, the filtration area 12c is a rectangular parallelepiped container, and is divided into five equal parts in the longitudinal direction and the vertical direction. Each divided portion is partitioned by a claw-shaped filter medium partition plate 23 protruding from the bottom surface of the filtration area 12c, and the three middle divided portions are the filter medium chamber 20a. As for the remaining two divided portions at the end, the divided portion immediately below the discharge port of the water supply pipe 33 extending from the pumping area 12a is the water supply chamber 24, and the divided portion at the symmetrical position is the water purification chamber 20b. In the filter medium chamber 20a, a flat filter medium 21 is supported by the filter medium partition plate 23 and inserted from above so that a book stands on a so-called book end. The filter medium partition plate 23 does not need to have a protruding claw shape, and in order to facilitate the insertion and support of the filter medium 21, a mesh plate-like partition plate through which water can pass is provided in the entire longitudinal direction of the filter medium chamber 20a. You may stand up to cross.

  Water from the water tank 10 is poured from the water supply pipe 33 and stored in the water supply chamber 24. After passing through the filter medium 21 in the filter medium chamber 20a substantially horizontally and filtered, it is stored in the water purification chamber 20b. . The water further overflows from the purified water discharge port 25 formed by a notch in the upper part of the partition plate 12e separating the water purification chamber 20b and the air mixing area 12b, and is stored in the air mixing area 12b.

  The description of each of the three areas is completed as described above. Next, the water circulation and the air mixing path in this embodiment will be described with reference to FIGS. 4 and 5. 4 is a side cross-sectional view of the aeration apparatus according to the present embodiment, and FIG. 5 is a VV cross-sectional view of FIG. The arrows in the figure indicate the flow of water. For convenience of description, illustration of members such as the overflow pipe 70 or the mounting screw 54 that are not directly related to the water circulation and the air mixing path, which are features of this embodiment, is omitted.

  In FIG. 4, the water in the water tank 10 passes through the pumping pump chamber 30 c via the strainer 31, and is poured from above into the filtration area 12 c from the discharge port of the water supply pipe 33. As shown in FIG. 5, the water in the filtration area 12c is first stored in the water supply chamber 24, and then passes so as to cross the filter medium 21 in the filter medium chamber 20a substantially horizontally, and enters the water purification chamber 20b. Store. The water stored in the purified water chamber 20b overflows from the purified water discharge port 25 provided by cutting out the upper part of the partition plate 12e, and is stored in the aeration area 12b.

  Returning to FIG. 4 again, the water overflowing the filtration area 12c and stored in the aeration area 12b flows through the gap between the siphon cap 51 and the return pipe 52 and flows into the return pipe 52 from the upper open end 52a of the return pipe 52. . At this time, the outside air taken in from the air intake hole 61a is taken in from the air discharge hole 65 to become bubble water, and is discharged into the water tank 10 from the return holes 53a and 53b.

  Next, based on FIGS. 6-9, the state until the water in the aeration area 12b turns into bubble water and is discharged from the return hole 53 is explained in full detail below. In the figure, black arrows indicate the flow of water (including bubble water), and white arrows indicate the flow of air. For convenience of illustration, FIGS. 6 to 9 are drawn in a simplified configuration. Therefore, members such as the mounting screw 54 or the air amount adjusting valve unit 62 are not shown.

(1) As shown in FIG. 6, the water level in the aeration area 12 b rises and compresses air from the gap between the siphon cap 51 and the return pipe 52. At this time, the air is pushed out from the air vent hole 55.
(2) As shown in FIG. 7, the liquid level continues to rise, water flows into the return pipe 52 through the gap, and the liquid level in the return pipe 52 rises. At this time, a downward water flow is generated in the return pipe 52 due to the rising liquid level drop. Note that a small amount of water in the return pipe 52 leaks into the water tank 10 from the air vent hole 55.

  (3) As shown in FIG. 8, the water further flows into the gap and fills the siphon cap 51 with water. At this time, since the inside of the system composed of the siphon cap 51 and the return pipe 52 reaches a degree of vacuum sufficient to obtain the siphon action, the siphon action is caused between the water in the aeration area 12 b and the water in the water tank 10. A water stream is formed. Further, since the water pressure applied to the air vent hole 55 is weakened with the formation of the water flow, the water force leaking from the air vent hole 55 is weakened.

  In the vicinity of the return hole 53a in the return pipe 52, the water pressure due to the water in the water tank 10 is low, so water starts to be discharged from the return hole 53a first. Furthermore, on the same principle that an aspirator (water flow pump) exhausts, the water flow entrains air from the air discharge pipe 64 to form a bubble water flow. As a result, bubble water is discharged from the return hole 53a. However, in the vicinity of the return hole 53b at this time, the water pressure in the water tank 10 is high, and a water flow enough to entrain air is not yet obtained, so the discharge of bubble water from the return hole 53b is small.

  When air is forcibly discharged from the air discharge pipe 64 by siphon action, the air intake cap 61 is removed, that is, the air is directly sucked from the inlet of the air discharge pipe 64. Makes a loud wind noise when air passes through the inlet. This is a so-called straight pipe resonance phenomenon that occurs because a large amount of air passes through the opening at the end of the straight pipe at one time. However, in the present embodiment, since the air intake holes 61a formed in the air intake cap 61 have a structure in which air is distributed and taken in from the plurality of holes on the side surface of the pipe, the wind noise is much higher. Is kept small.

  (4) As shown in FIG. 9, shortly after the water flow by the siphon action begins to discharge from the return hole 53a, the water flow becomes priming water and the amount of water discharged from the return hole 53b also forms the bubble water flow. Reach enough. Here, the discharge of the bubble water from both the return holes 53a and 53b is established. In addition, the water leaking from the air vent hole 55 hardly comes out at the time of establishment.

As a conclusion of the present embodiment, the water flow formed in the water tank 10 will be described with reference to FIG. In FIG. 10, the water flow formed in the water tank 10 is indicated by arrows. In the figure, the black arrow indicates the direction of the water flow discharged from the return hole 53a, the white arrow indicates the direction of the water flow discharged from the return hole 53b, and the width of the arrow indicates the strength of the water flow.
The water flow from the return hole 53a and the water flow from the return hole 53b flow substantially in parallel, and together with the water flow sucked into the strainer 31, a uniform main water flow 100 flowing in one direction along the inner wall of the water tank 10 is obtained. Form. On the other hand, in the central part of the aquarium 10, the branch water stream 101 branched from the main water stream 100 flows gently. For appreciation fish, resting in the branch water stream 101 or exercising in the main water stream 100. A way of life is possible. Moreover, since the water flow circulating in the aquarium 10 can be sufficiently formed, there is no stagnation of water that leads to environmental deterioration for fish and shellfish. Further, the main water flow 100 flowing along the inner wall of the aquarium 10 has an advantage that adhesion of moss to the inner wall is prevented.

  The second embodiment is shown in FIG. 11 and FIG. FIG. 11 is a side cross-sectional view of the air mixing portion of the air mixing apparatus according to the present embodiment, and FIG. 12 is a plan view of the air mixing portion. In addition, the same code | symbol is attached | subjected to the member corresponding to the member shown in FIG.2 and FIG.3 in Example 1. FIG.

  There are two differences between the present embodiment and the first embodiment. First, (1) the air intake cap 61 and the air amount adjustment valve unit 62 in the first embodiment are combined into one air amount adjustment valve unit 62 ′, and second, (2) the first embodiment. The fixing method of the siphon cap 51 is changed.

The configuration of this embodiment divided into the above two points will be described below.
(1) The air amount adjustment valve unit 62 ′ of the present embodiment is a valve unit integrally formed in a T shape having openings in three directions, and two openings at T-shaped line symmetrical positions. Is the air intake hole 61a. Each of the two air intake holes 61a is provided with a cock 62d for adjusting the air amount, and the outside air taken in from the cock 62d is connected to an opening at the lower end position of the T-shaped center line. Through the air discharge pipe 64 and discharged from the air discharge hole 65.

  Unlike the case of the first embodiment, there are only two air intake holes 61, but the generation of wind noise is suppressed. This is because the outside air taken in from the air intake hole 61a is bent 90 degrees in the air amount adjusting valve unit 62 'and flows into the air discharge pipe 64, so that so-called straight pipe resonance does not occur.

  (2) A stand 56 is used to fix the siphon cap 51 in this embodiment. The stand 56 has three legs made of metal or resin as a support, and an annular pedestal 56a for fixing the support of the three legs is provided at the lower end of the stand 56. An annular stopper 56 b is used to fix the stand 56 and the siphon cap 51. The stopper 56b is fitted from the upper part of the stand 56 and fastened. At this time, the positional relationship between the air discharge hole 65 and the upper open end 52a of the return pipe 52 is adjusted. As the stopper 56b, for example, a rubber band may be used to secure the strap 56b.

The third embodiment is shown in FIG. FIG. 13 is a perspective view of the aeration apparatus according to the present embodiment, partially broken away. In addition, the same code | symbol is attached | subjected to the member corresponding to the member shown in FIG.
The present embodiment has a structure in which the aeration area 12b in the first embodiment is installed in the filtration area 12c. The aeration area 12b is formed in a cylindrical shape so as to be accommodated in the water purification chamber 20b in the filtration area 12c, and its lower end is integrally bonded to the bottom surface of the water purification chamber 20b. On the other hand, the upper end of the purified water stored in the purified water chamber 20b is high enough to flow into the aeration area 12b as indicated by the arrow in FIG. In the present embodiment, since the installation space for the overflow pipe 70 cannot be obtained in the aeration area 12b, it is necessary to install the overflow pipe 70 at a location outside the aeration area 12b in the water purification chamber 20b. Further, the upper end of the overflow pipe 70 is higher than the upper end of the aeration area 12b in terms of its function already described in the first embodiment.
The air amount adjusting valve unit 62 is supported by an air amount adjusting valve unit support lid 66 that covers the filter medium chamber 20a and the water purification chamber 20b in the filtration area 12c.

The fourth embodiment is shown in FIG. FIG. 14 is a side sectional view of the aeration apparatus according to the present embodiment. In addition, the same code | symbol is attached | subjected to the member corresponding to the member shown in FIG.
In this embodiment, the water flow path constituted by the siphon cap 51 and the return pipe 52 in the first embodiment is replaced with an inverted U-shaped siphon tube 67. An air discharge pipe 64 passes through the apex of the siphon tube 67, and water passing through the siphon tube 67 entrains air from the air discharge hole 65. In the present embodiment, fine adjustment of the position of the air discharge hole 65 is performed by pulling out the air discharge pipe 64 from the siphon tube 67 or pushing it into the siphon tube 67.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view showing an aeration apparatus according to Embodiment 1 of the present invention. FIG. 3 is a side cross-sectional view of the aeration part of the first embodiment. FIG. 3 is a plan view of an aeration part of the first embodiment. It is side surface sectional drawing of the aeration apparatus of Example 1. FIG. It is VV sectional drawing of FIG. It is an expanded sectional view before water enters into the aeration part of Example 1. It is an expanded sectional view while water has entered the aeration part of Example 1. It is an expanded sectional view when water enters the aeration part of Example 1 and bubble water begins to be discharged. It is an expanded sectional view after water entered the aeration part of Example 1, and discharge of bubble water was established. It is a perspective view which shows the water flow in the water tank of Example 1. FIG. It is side surface sectional drawing of the air mixing part of the air mixing apparatus which concerns on Example 2 of this invention. 6 is a plan view of an aeration part of Example 2. FIG. It is a perspective view which partially fractures and shows the aeration apparatus concerning Example 3 of the present invention. It is side surface sectional drawing of the air mixing apparatus which concerns on Example 4 of this invention. It is side surface sectional drawing of the conventional aeration apparatus. It is side surface sectional drawing of the aeration apparatus shown by patent document 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water tank 11 Water tank lid 12 Case 12a Pumping area 12b Air mixing area 12c Filtration area 12d, 12e Partition plate 20 Filtration tank 20a Filter medium chamber 20b Water purification chamber 21 Filter medium 23 Filter medium partition plate 24 Water supply chamber 25 Purified water discharge port 26 Pumping water 30 Pump 30a Pump for pumping pump 30b Motor shaft 30c Pumping pump chamber 30d Power cord for pumping pump 31 Strainer 32 Water intake pipe 33 Water supply pipe 40 Air pump 40a Air pump power cord 41 Air feed pipe 42 Air stone 43 Bubble mixing nozzle 51 Siphon cap 52 Return pipe 52a Upper open end 53 Return hole 54 Mounting screw 55 Air vent hole 56 Stand 56a Ring base 56b Stopper 61 Air intake cap 61a Air intake hole 62 Air amount adjustment valve unit 6 a valve inlet 62b the valve outlet 62d cocks 62c valves 62, 62 'air control valve unit 63 joint pipe 64 air discharge pipe 65 the air discharge hole 66 the air control valve unit support lid 67 siphon tube 70 overflow pipe 100 main water stream 101 branches flow

Claims (4)

A water tank that can store water therein, a filtration tank that is installed at a position higher than the liquid level of the water in the water tank, and has a water filtering means, a pumping device that pumps water from the water tank to the filtration tank, and a filtration tank The return device returns the water filtered by the water tank to the water tank so that the water can be circulated between the filter tank and filtered, and dissolved oxygen is supplied when the water is returned from the filter tank to the water tank. A fish tank for seafood,
The return device has a flow path configuration in which water is dropped by a siphon action, and an air intake path that sucks and takes in external air to the part of the flow path by the siphon action to form a bubbly water flow. An aeration apparatus for a fish tank characterized by being connected to a flow path. An aeration apparatus for a fish tank according to claim 1,
The flow path configuration of the return device is formed of a pipe, and the pipe has at least two of a relatively high position near the liquid level and a relatively low position near the bottom of the water tank at a position below the water level of the water tank. An air mixing device for a fish tank, wherein a return hole is formed at a location. An aeration apparatus for a fish tank according to claim 1 or 2,
The air intake passage is formed in a tube shape with a closed end, an air intake hole is formed on the circumference of the tube-shaped end portion, and suction when air is taken into the tube shape An aeration apparatus for a fish tank characterized by weakening the sound. An aeration apparatus for a fish tank according to any one of claims 1 to 3,
The filtration tank has a structure in which a plurality of plate-shaped filter media are arranged in parallel so that the thickness direction thereof coincides with the horizontal direction, and the flow path configuration is such that water is filtered while the plurality of parallel filter media are traversed substantially horizontally. An aeration apparatus for a fish tank characterized by the above.

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