JP2997417B2 - Drainage amount fluctuation device and liquid purification device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage amount changing device and a liquid purifying device using the same, and more particularly, to a water tank purifying device for purifying water in a water tank for breeding appreciation fish and aquatic plants. It relates to a suitable device structure.

[0002]

2. Description of the Related Art In an aquarium for breeding appreciation fish and aquatic plants, and for appreciating them, the water in the aquarium is continuously purified to maintain a favorable underwater environment and reduce the frequency of water changes. , To facilitate management. A water purifier used in such a water tank is configured to supply water in the water tank to a purifier by a pump and return the water to the water tank again through a filter or the like of the purifier.

[0003] Purifiers include those that are installed in water in a water tank, those that are installed outside a water tank, and those that are installed above the water tank. Each of these has a filtration filter inside and traps solids by passing water through the filtration filter, and ammonia and nitrite, which attach to the filtration filter and harm organisms by microorganisms that live there. Disassemble etc.

[0004] The shape and structure of these purifiers are various. However, no matter the shape and structure of the purifier, an area where the water flow is fast occurs in a part of the purification path, and in another part. An area where water flow stagnates occurs. In this case, due to the variation of the flow velocity of the water flow, the biological filtration action by the microorganisms is not sufficiently performed, or fine solids settle, or pass through without being filtered, and further, in a stagnant region of the water flow. There are problems such as abnormal occurrence of microorganisms and propagation of microorganisms of the type that goes against purification.

[0005] Therefore, conventionally, a drainage amount fluctuation device utilizing a siphon action is provided in a purification path of a purifier, and the amount of water passing through the purifier is temporally increased or decreased by the drainage amount fluctuation device, whereby a water flow in the purification path is reduced. The one configured so as not to generate a stagnation area is used.

For example, as shown in FIG. 10, a purifier 20 is disposed above the water tank 10, and a discharge chamber 22 communicated with a water introduction port 21 b is formed at a stage subsequent to a filtration tank 21 provided in the purifier 20. Is done. A drain pipe 23 penetrating the bottom surface of the discharge chamber 22, having an upper opening 23 a communicating with the discharge chamber 22 at the upper part, and a lower opening 23 b projecting into the water tank 10 at the lower part is provided. Is provided. A part of the drainage pipe 23 existing in the discharge chamber 22 is covered with a coating container 24, and a water passage 24 a communicating the inside and outside of the coating container 24 is formed below the coating container 24.

An intake pipe 25 extends from an upper portion of the coating container 24, and the intake pipe 25 has an intake port 25 a at a lower portion of the discharge chamber 22. When the water level in the filtration tank 21 rises, the water level in the discharge chamber 22 also rises, and during that time, the air in the coating container 24 is discharged from the drain pipe 23. Discharge chamber 2
When the water level of 2 exceeds the upper opening 23a of the drain pipe 23,
The water in the coating container 24 is discharged from the drain pipe 23 to the water tank 10, but since the amount of water is still small, the discharge chamber 22 is discharged.
The water level inside rises further.

On the other hand, the air remaining in the upper part of the coating container 24 is gradually reduced with the water discharged from the drain pipe 23.
Then, the gas is exhausted to zero, and the water level in the coating container 24 gradually rises. When the water level in the coating container 24 rises, the amount of water flowing out of the drainage pipe 23 increases, and the flow velocity increases, so that the air in the coating container 24 is drawn in from the drainage pipe 23 and discharged. Is filled with When the inside of the coating container 24 is filled with water, a siphon is formed by the discharge chamber 22, the coating container 24, and the drain pipe 23, and a large amount of water is drained from the drain pipe 23 into the water tank 10 at a stretch. The water surface 22a in the inside of the filter tank 21 drops rapidly,
a is also reduced.

When the water level 22a in the discharge chamber 22 decreases and approaches the height of the intake port 25a of the intake pipe 25, the coating container 2
Due to the pressure difference between the inside and outside of 4, air is sucked into the coating container 24 from the air inlet 25a, and the siphon action stops. When the siphon action stops, water falls from the water passage portion 24a of the coating container 24 to the discharge chamber 22, where the water returns to the initial state. As described above, the amount of drainage from the discharge chamber 22 periodically fluctuates greatly, and the water level in the filtration tank 21 also moves up and down periodically, so that the water retention area in the filtration tank 21 can be eliminated. .

FIG. 11 shows the same operation as that shown in FIG. 10 described above. In this case, the lower opening 23b of the drain pipe 23 is submerged below the water surface of the water tank 10, but instead, an exhaust port 23c is formed on the water surface of the water tank 10 in the drain pipe 23. Also in this case, when the water level of the filtration tank 21 and the discharge chamber 22 rises, the water is exhausted from the exhaust port 23c, and eventually the siphon action occurs. As a result, the drainage amount increases rapidly, and the water levels of the filtration tank 21 and the discharge chamber 22 rise. When it decreases, air flows in from the intake port 25a of the intake pipe 25, and the siphon action stops.

[0011]

The method of increasing or decreasing the amount of water inside the purifier by using the above-mentioned siphon action is very important in that the water flow stagnation portion easily formed inside the purification path is eliminated and the purification performance is enhanced. It is effective for However, in such a drainage fluctuation device as described above, the occurrence of the siphon action and the repetition of the stoppage are broken by a very trivial cause,
It is easy to cause a malfunction such that the siphon action is not generated or the water is drained at a constant flow rate without fluctuation.

For example, in the structure shown in FIGS. 10 and 11, the filtration tank 21 and the discharge
When the water level of 2 decreases, air is sucked into the coating container 24 from the suction pipe 25 due to the pressure difference between the inside and the outside of the coating container 24. However, if the suction is performed before the water level is sufficiently lowered, the siphon action will occur. The water level in the discharge chamber 22 rises again due to the decrease in the drainage amount, and the water introduction amount and the drainage amount may be balanced at a water level higher than the intake port 25 a of the intake pipe 25.

In the structure shown in FIG.
0 rises and the lower opening 23 of the drain pipe 23
When the pressure reaches b, the air in the coating container 24 cannot be discharged, and the siphon effect cannot be generated. on the other hand,
In the structure shown in FIG. 11, the pressure difference between the inside and outside of the drain pipe 23 fluctuates due to the vertical fluctuation of the water surface 10 a of the water tank 10. By slightly entering the air,
There is a case where the water level fluctuation stops because the water conveyance amount and the drainage amount are balanced.

[0014] Such malfunctions occur more frequently when foreign matter adheres to the intake port or water passage port of the intake pipe while the purifier is being used, and the fluctuation of the water level disappears. However, there is a problem that good purification cannot be performed.

Further, in the structure shown in FIG.
Since the lower opening 23b is above the water surface of the water tank 10, there is a problem that the water surface of the water tank is disturbed by the drainage, the sound of the drainage is loud, and the sound is harsh. On the other hand, in the structure shown in FIG. 11, since the lower opening 23 b of the drain pipe 23 is below the water surface of the water tank 10, the drain noise is reduced, but the exhaust port 23 c is easily clogged and the exhaust from the drain pipe 23 cannot be performed. Is a problem that frequently occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to realize a novel structure of a drainage amount fluctuation device which can surely generate a siphon action and is less likely to malfunction. Accordingly, it is an object of the present invention to obtain a liquid purifying apparatus which has high durability and can obtain a reliable purifying action.

[0017]

Means taken by the present invention to solve the above-mentioned problems are provided above a lower liquid level, a discharge chamber for receiving liquid supply, and a penetrating through the discharge chamber.
A drain pipe having a lower opening disposed above or below the lower liquid surface and extending into the discharge chamber and having an upper opening at an upper end thereof, penetrating the discharge chamber, and forming the drain pipe; A suction pipe having a suction port at a height substantially equal to the upper opening and having a suction port at a lower portion located on the lower liquid level, and the drain pipe and the suction pipe in the discharge chamber from above. And a coating member for coating.

According to this means, when the liquid level in the discharge chamber rises, the air inside the coating member rises while the air inside the coating member is released from the intake pipe, and the liquid level inside the coating member rises. When the liquid reaches the upper opening, the liquid is drained from the drain pipe toward the lower liquid level. At this time, since the liquid suction port of the intake pipe is also below the liquid level, air is not released, but the air is discharged to the outside by being caught in the discharge of the liquid from the drain pipe, and the inside of the covering member becomes liquid. When it is filled with, a siphon action occurs. When the liquid level in the discharge chamber drops due to the siphon action, and the external air pressure applied to the intake port becomes lower than the internal pressure of the covering member below the liquid pressure corresponding to the length of the intake pipe, the intake port of the intake pipe From outside, the outside air is introduced into the inside of the covering member, and the siphon action stops. In this case, the lower opening of the drainage pipe operates in the same manner regardless of whether it is above or below the lower water surface.

In this case, since the intake port of the intake pipe is located outside the discharge chamber, the water level in the discharge chamber rises after a small amount of outside air is sucked in as in the conventional case, and it is difficult for the outside air to enter the inside of the covering member. Since there is no interruption in a sufficient state and the air can be reliably sucked by the difference in pressure between the inside and outside of the covering member, it is possible to prevent a malfunction such that the siphon action is not continued and stopped in an incomplete state. Also, since it operates without trouble even when the lower opening of the drain pipe is immersed below the lower liquid level,
Fluctuation of the lower liquid level and drainage noise can be reduced.

Here, a gas guide structure is provided above the liquid suction port of the suction pipe to guide the gas introduced from the suction port through the suction pipe to the vicinity of the inner upper surface of the covering member without diffusing. Preferably.
According to this means, by providing a gas guide structure, for example, a tubular member extending upward from the liquid suction port to near the inner upper surface of the covering member, bubbles of outside air entering from the liquid suction port expand (to reduce the hydraulic pressure). It often swells due to the drop.)
Intake noise and intake shock (vibration, etc.) can be reduced.

Further, it is preferable that an enlarged diameter portion having a larger opening area than the intake pipe is provided at a lower end portion of the intake pipe. According to this means, by adjusting the height at which the enlarged diameter portion is formed, the substantial height of the intake port of the intake pipe can be adjusted. It is possible to adjust the timing at which the siphon action is stopped (the timing at which the liquid level in the discharge chamber reaches the level at which the siphon action ends). For example, when the height of the enlarged diameter portion is increased, the height of the intake port is increased, and the intake port enters the inside of the covering member, so that the hydraulic pressure that hinders intake can be reduced.

[0022] Further, it is formed on the covering member,
It is preferable to provide a check valve structure configured to release gas from inside to outside of the covering member and not to introduce gas from outside to inside of the covering member. According to this means, since the gas can be exhausted from the inside of the covering member by the check valve structure, the siphon action can be started more reliably.

In this case, it is preferable that the check valve structure comprises an opening provided at the upper part of the covering member and a lid attached to the opening so as to be openable and closable. . According to this means, the check valve structure can be realized with an extremely simple structure, and operation failure due to clogging or the like can be prevented.

Next, as another means according to the present invention, there is provided a discharge chamber which is disposed above the lower liquid level and receives the supply of liquid, and penetrates through the discharge chamber and sinks below the lower liquid level. A drain pipe having a lower opening and extending into the discharge chamber and having an upper opening at an upper end thereof; a coating member for coating the drain pipe and the intake pipe from above in the discharge chamber; An intake pipe led out from an upper part of the member to a lower part of the discharge chamber outside the covering member, and formed at an upper part of the covering member, and discharges gas from inside to outside of the covering member; A check valve structure configured to prevent gas from being introduced from the outside to the inside.

According to this means, since the gas can be exhausted from the inside of the covering member by the check valve structure, the siphon action can be started more reliably. Here, it is preferable that the check valve structure includes an opening provided at an upper portion of the covering member and a lid attached to the opening so as to be freely opened and closed.

Although the tip of the intake pipe may be formed downward, in order to surely stop the siphon action, the intake pipe is formed so as to be lowered once and then slightly upward again. It is preferable that a portion where the intake port is formed, for example, a tip portion is formed in a shape raised above the lowermost portion.

Next, there is a case where a liquid purifying apparatus in which the above-mentioned drainage amount changing apparatus is arranged in a purifying path is constructed. In this case, by arranging the drainage amount variation device in the purification path, the flow rate of the purification device periodically fluctuates. Purification can be performed. Further, such a variation of the drainage amount can be continuously performed for a long time without malfunction.

Here, a sedimentation tank for sedimenting and separating the solid content of the introduced liquid, a filtration tank for filtering the liquid supplied from the sedimentation tank with a filtration filter, and a filtration tank for filtering the liquid supplied from the filtration tank. It is preferable to sequentially provide the drainage amount changing device for changing the drainage amount. According to this means, a large amount of solids is removed to some extent by the sedimentation tank and supplementary biological filtration is performed, and fine solids are removed and the biological filtration is performed by the filtration tank. Can be performed, and clogging and contamination can be prevented in the drainage amount fluctuation device at the subsequent stage.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a drainage amount fluctuation device and a liquid purification device using the same according to the present invention will be described with reference to the accompanying drawings. The embodiment described below is directed to a water purification device of a type attached to an upper part of a water tank for breeding and displaying ornamental fish or ornamental aquatic plants, and a drainage amount variation device (periodic siphon that is incorporated in the water purification device). A device that generates an action). However, the present invention is not limited to the following embodiments, but is limited to a drainage amount variation device for discharging a liquid used for various applications, and to a type arranged at the top of a water tank. Without being limited thereto, the present invention can be widely applied as various purifying devices installed inside and outside a water tank, and as a liquid purifying device for purifying various liquids other than water in a water tank.

(First Embodiment) FIG. 1 is a longitudinal sectional view showing a structure of a first embodiment of a liquid purifying apparatus and a drainage amount varying apparatus according to the present invention. The water purification device 40 according to the first embodiment is configured to be fitted and disposed on the upper part of the water tank 30. A submersible pump (not shown) is housed in the water tank 30.
Then, water is pumped up to the water guiding section 42.

The water pumped up by the water guide section 42 is supplied to an overflow section 42 a provided on a part of the peripheral wall of the water guide section 42.
Through the introduction frame 43 and into the settling tank 44. The introduction frame 43 converts the water supplied from the overflow section 42a into a settling tank 44.
It is intended to be appropriately dispersed and introduced into the inside, a partition wall is provided on the side of the filtration tank 45 described later, and a wire mesh, a resin net, and a large number of perforations having a large number of through holes are provided at the bottom. The formed plate material and the like are attached.

In the settling tank 44, a container 44b made of synthetic resin or the like is mounted so as to be fitted almost exactly, and an adsorbent 48 made of a plurality of short tube-shaped resin materials is filled therein. Have been. As the adsorbent, any material may be used as long as it is small in size so that the surface area is large as a result, and the structure and shape exposed to the outside are complicated, but it has a characteristic of adsorbing contaminants. It is more preferable that the material is made of such a material. The container 44b is formed so that it can be removed and cleaned for cleaning the sedimentation tank 44.

A filtration tank 45 is formed adjacent to the settling tank 44 with an overflow section 44a interposed therebetween. The filtration tank 45 accommodates a sponge-like filtration filter 46. A number of openings 45a are formed below the filtration filter 46, and a water passage 47 is formed below the openings 45a. The water passage 47 communicates with the discharge chamber 51 adjacent to the filtration tank 45.

The drainage amount changing device 50 according to the present embodiment is provided in a discharge chamber 51. The discharge chamber 51 has a drain pipe 52 extending vertically so as to penetrate the bottom surface of the discharge chamber 51, and an intake pipe formed next to the drain pipe 52 and extending vertically so as to penetrate the bottom of the discharge chamber 51. 53, a cover container 54 formed in a cup shape that covers the drain pipe 52 and the intake pipe 53 from above, and a lid 55 attached to fit over the top of the cover container 54 are arranged.

A water passage 54a is formed at the lower end of the coating container 54 so that the discharge chamber 51 communicates with the inside of the coating container 54. Upper opening 52a of drain pipe 52
And the water suction port 53a formed at the upper end of the intake pipe 53 are formed at substantially the same height. The height of the water inlet 53a may be formed slightly above and below the upper opening 52a of the drain pipe 52. The drain pipe 52 is configured such that the lower opening 52b formed at the lower end thereof is located below the water surface 30a of the water tank 30.

The suction pipe 53 is formed to have a smaller diameter than the drain pipe 52, and the lower end of the suction pipe 53 is fitted to an enlarged diameter portion 56 having a larger diameter. Inlet 53b facing enlarged diameter portion 56
Is formed to have a predetermined height in consideration of the operation characteristics of the drainage amount varying device 50 described later. Since the intake pipe 53 and the enlarged-diameter portion 56 are fitted, the height of the intake pipe 53 can be adjusted by adjusting the fitting depth. The intake pipe 53 and the enlarged diameter portion 56 may be connected by screw connection.

In the water purifying device 40, the water guide 4
2 is introduced into the sedimentation tank 44 through the dispersion frame 43 through the overflow section 42a, and the components adhere to the surface of the adsorbent 48 and the solid content precipitates. Purification. This settling tank 44
In, biological filtration may be performed by microorganisms attached to the surface of the adsorbent.

Next, in the filtration tank 45, fine solids are physically removed by the filtration filter 46, and harmful components are chemically purified mainly by the decomposing action of the aerobic microorganisms living in the filter. You. The purified water passes through a number of openings 45 below the filter 46.
From a, it proceeds to the water passage 47 and is finally introduced into the discharge chamber 51.

In the water purifier 40, a settling tank 44, a filtration tank 45, and a discharge chamber 5 are driven by a submersible pump (not shown).
1, the water in the water tank 30 is continuously supplied at a substantially constant flow rate. The operation of the drainage amount changing device 50 in the discharge chamber 51 is as follows.
By periodically increasing and decreasing the amount of drainage, the water level of the discharge chamber 51 and the filtration tank 45 connected to the discharge chamber 51 is periodically changed up and down. In this configuration, the sedimentation tank 44, the filtration tank 45, and the discharge chamber 51 are sequentially formed, so that clogging and contamination at a later stage can be prevented.
Thus, it is possible to prevent clogging and contamination of the drainage amount changing device 50 formed in the first embodiment, thereby reducing malfunction.

The operation of the drainage amount changing device 50 will be described with reference to FIGS.
This will be described below with reference to FIG. First, as shown in FIG.
When the water levels in the filtration tank 45 and the discharge chamber 51 rise from the minimum water level, the water is not drained from the drain pipe 52, and the water level gradually rises according to the supply of water from the submersible pump. At this time, the air in the coating container 54 is discharged from the intake pipe 53 as the water level rises.

Next, as shown in FIG. 3, when the water level in the discharge chamber 51 further rises, the upper opening 52a of the drain pipe 52 and the water intake port 53a of the intake pipe 53 eventually submerge, and the drain pipe 52 and the intake pipe Water is drained from 53. At this time, since the intake pipe 53 has a small diameter, the exhaust cannot be immediately performed. However, since the drain pipe 52 has a large diameter, a part of the air in the coating container 54 is discharged together with the drainage.

As shown in FIG. 4, when the water level further rises, the exhaust capacity of the drain pipe 52 is reduced by the lower opening 52 of the drain pipe 52.
Since b is submerged in the water tank 30 and is slight, the air in the coating container 54 cannot be completely exhausted, and the pressure in the coating container 54 rises. Then, the coating container 54
As shown in FIG. 4, the lid 55 fitted to the upper surface of the cover temporarily rises slightly upward to discharge air. Then, as the water level in the coating container 54 rises, the drain pipe 5
Since the amount of water discharged from 2 increases and the flow velocity also increases at the same time, the small amount of air remaining in the coating container 54 is drawn in and discharged.

When the air in the coating container 54 disappears, the discharge chamber 51 and the inside of the coating container 54 and the drain pipe 52 are filled with water and a siphon action occurs. The water inside is rapidly discharged to the water tank 30.
As a result of this siphon action, the water level in the discharge chamber 51 and the filtration tank 45 drops rapidly as shown in FIG.
The pressure inside 4 and the pressure between the outside air are reversed.

When the pressure inside the coating container 54 becomes higher than the water pressure corresponding to the difference between the height of the water suction port 53a of the suction pipe 53 and the height of the suction port 53b with respect to the outside air, the air flows from the suction port 53b due to the pressure difference. The water is sucked and foamed from the water inlet 53a and enters the coating container 54. Since the air that has entered enters the upper portion of the coating container 54, the siphon action stops. When the siphon action stops, the water pressure difference between the inside and outside of the coating container 54 immediately causes the coating container 54 to stop as shown in FIG.
The water inside is discharged to the outside from the drain pipe 52 and the water passage portion 54a, and returns to the state shown in FIG. 2, and the difference in water level between the inside of the coating container 54 and the discharge chamber 51 disappears.

According to the present embodiment, the suction pipe 53 is provided in the coating container 54, and the suction is performed from the outside of the discharge chamber 51 by the pressure difference between the inside and the outside of the coating container. The repeated operation does not disappear, the siphon action is reliably stopped, and the amount of drainage can be periodically increased or decreased. Drain pipe 5
Since the lower opening 52a is below the water surface of the water tank, the water surface of the water tank does not fluctuate or generate drainage noise, and is particularly preferable when used in a viewing water tank.

Further, the intake pipe 53 can substantially reduce the pressure required for intake by the enlarged diameter portion 56, so that intake can be performed more reliably. Further, by adjusting the height of the enlarged diameter portion 56, the minimum water level of the filtration tank 45 and the discharge chamber 51 can be easily set, and the design of the water purification device becomes easy.

The lid attached to the upper surface of the coating container 54 functions as a check valve (one-way valve) for discharging the air in the coating container 54, so that the siphon action can be more reliably generated. Further, since the lid is simply fitted from above without using a valve structure, the structure is simplified and the probability of failure can be reduced. Further, since the cover 55 is attached so as to cover the entire upper surface of the coating container 54 as in the present embodiment, the surface receiving the internal pressure can be widened, and the internal pressure can be reliably released by operating reliably. For example, when a small check valve having a valve body made of a flexible plate having a part of the periphery fixed to the upper surface of the coating container 54 is attached, the valve body of the check valve gets wet with water and adsorbs to the valve seat. This may make it impossible to release the internal pressure, but such a malfunction does not occur in the above embodiment.

(Second Embodiment) FIG. 8 shows a second embodiment according to the present invention.
It is a longitudinal section showing an embodiment. This embodiment is the same as the first embodiment except for the structure of the drainage amount changing device 50 configured in the discharge chamber 51, and illustration and description thereof are omitted.

In this embodiment, a water inlet 53a is formed in the upper part of the intake pipe 53 by a hole formed in the peripheral surface.
4, a gas guide 53c having an opening at the upper end thereof is formed. This gas guide portion 53c
Does not discharge the air sucked from the suction port 53b through the water suction port 53a, but the uppermost portion of the coating container 54 (the lid 5).
5 just below the inner surface).

As shown in FIG. 6, since the intake pipe 53 sucks the air vigorously due to the pressure difference between the inside and outside of the coating container 54,
Large bubbles are generated at the upper part of the coating container 54, and the bubbles rise and spread to the surroundings and collide with the inner surface of the lid 55, causing a loud noise to be generated.
By forming c, the foam reaches the uppermost portion in the coating container 54 without being violent or spreading around, so that the sound generated at the time of intake can be reduced.

In this embodiment, a hole is formed in the peripheral surface slightly below the upper end of the intake pipe 53 to form the water inlet 53a.
Although the portion above 3a is formed as a gas guide portion 53c, the gas guide portion only needs to be disposed above the water inlet, and for example, a tubular or frame-shaped gas guide portion from the inner surface of the lid 55. May be formed to project downward, and an opening may be formed near the inner surface.

In the present embodiment, the enlarged diameter portion 57 has a truncated conical cross section and is formed so as to gradually increase in diameter as it goes downward, so that the flow of drainage flowing out from the suction port 53b can be made smooth. I have to.

(Third Embodiment) Next, a third embodiment according to the present invention will be described with reference to FIG. In the third embodiment, a drain pipe 52 is provided in a discharge chamber 51.
Only the coating container 54 covers only the coating container 54, and no intake pipe is formed in the coating container 54. Instead, the coating container 5
An intake pipe 58 extends from the upper part of the discharge chamber 4, and extends downward, passes through a U-shaped part 58 c that once drops at the lower part of the discharge chamber 51 and then rises again, and then forms an intake port 58 b at the tip thereof. Have been.

In this embodiment, the intake pipe 58 has the same structure as the conventional example shown in FIG. 10, but the lid 55 is fitted on the upper surface of the covering container 54 as in the first and second embodiments. Since the lid 55 has the same function as the one-way valve, the air in the coating container 54 can be reliably discharged when the water level of the discharge chamber 51 rises, and the siphon action Can be reliably generated.

Further, by providing the U-shaped portion 58c at the lower portion of the intake pipe 58, the intake port 58b is provided at the position where the intake port 58b is once lowered and then raised again. The difference in water level with the mouth 58b can be made large, and incomplete intake unlike the conventional example does not occur, and sufficient intake is performed, so that the siphon action can be reliably stopped.

In this case, it is preferable that the intake pipe 58 is drawn out from a place as close to the top of the coating container 54 as possible. If the intake pipe 58 is formed to a high position in this way, air does not partially stay in the intake pipe 58 in the form of bubbles even when the water level in the coating container 54 rises during exhaust. This is because, at the time of suction, the air is supplied to the uppermost portion of the coating container 54 as it is, so that the suction is performed smoothly and the siphon action is stably stopped. Also, this is because the intake sound is reduced by the smooth intake.

[0057]

As described above, according to the present invention, since the intake port of the intake pipe is outside the discharge chamber, the water level in the discharge chamber rises after a small amount of outside air is sucked in as in the prior art, and Does not stop inadequately when the inside of the covering member enters, and the air can be reliably sucked by the pressure difference between the inside and outside of the covering member, so that the siphon action continues in an incomplete state and does not stop. Operation can be prevented. In addition, even when the lower opening of the drain pipe is immersed below the lower liquid level, the drain pipe operates without any trouble, so that the swing of the lower liquid level and the drainage noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the structure of a first embodiment of a drainage amount variation device and a liquid purification device according to the present invention.

FIG. 2 is an explanatory diagram illustrating a state of a drainage amount varying device according to the first embodiment.

FIG. 3 is an explanatory diagram of a state of the drainage amount varying device in the embodiment.

FIG. 4 is an explanatory diagram of a state of the drainage amount varying device in the embodiment.

FIG. 5 is an explanatory diagram of a state of the drainage amount varying device in the embodiment.

FIG. 6 is an explanatory diagram of a state of the drainage amount varying device in the embodiment.

FIG. 7 is an explanatory diagram of a state of the drainage amount varying device in the embodiment.

FIG. 8 is a longitudinal sectional view showing a structure of a second embodiment according to the present invention.

FIG. 9 is a longitudinal sectional view showing the structure of a third embodiment according to the present invention.

FIG. 10 is a longitudinal sectional view showing an example of the structure of a conventional drainage amount varying device.

FIG. 11 is a longitudinal sectional view showing another example of the structure of the conventional drainage amount varying device.

[Explanation of symbols]

 Reference Signs List 30 water tank 40 water purification device 50 drainage amount fluctuation device 51 discharge chamber 52 drainage pipe 52a upper opening 52b lower opening 53 suction pipe 53a water suction port 53b suction port 53c gas guide portion 54 coating container 54a water flow port 55 lid 56, 57 enlarged diameter portion

Claims (9)

(57) [Claims] A discharge chamber disposed above the lower liquid level and receiving a supply of liquid; and a lower opening penetrating the discharge chamber and disposed above or below the lower liquid level. A drain pipe extending into the chamber and having an upper opening at an upper end thereof, penetrating the drain chamber, having a liquid suction port at a height substantially equal to the upper opening of the drain pipe, and having the lower liquid surface An intake pipe with an intake port at the bottom located at the top,
A drainage amount varying device, comprising: a covering member that covers the drainage pipe and the intake pipe from above in the discharge chamber. 2. The gas according to claim 1, wherein a gas introduced from the suction port through the suction pipe to the vicinity of an upper inner surface of the covering member is provided above the liquid suction port of the suction pipe. A drainage amount fluctuation device characterized by having a guide structure. 3. The drainage amount variation device according to claim 1, wherein an enlarged diameter portion having an opening area larger than the intake pipe is provided at a lower end of the intake pipe. 4. The covering member according to claim 1, wherein the covering member is formed above the covering member so as to release gas from inside to outside of the covering member and not to introduce gas from outside to inside of the covering member. A drainage amount varying device provided with a check valve structure. 5. The check valve structure according to claim 4, wherein:
A drainage amount varying device comprising: an opening provided at an upper portion of the covering member; and a lid attached to the opening so as to be openable and closable. 6. A discharge chamber disposed above the lower liquid level and receiving a supply of liquid, and a lower opening penetrating through the discharge chamber and submerged below the lower liquid level and extending into the discharge chamber. A drain pipe having an upper opening at an upper end thereof, a covering member for covering the drain pipe and the intake pipe from above in the discharge chamber, and the discharging from the top of the covering member to outside the covering member. An intake pipe led out to the lower part of the room and formed on the upper part of the covering member, configured to release gas from the inside to the outside of the covering member and not to introduce gas from the outside to the inside of the covering member. And a check valve structure. 7. The check valve structure according to claim 6, wherein:
A drainage amount varying device comprising: an opening provided at an upper portion of the covering member; and a lid attached to the opening so as to be openable and closable. 8. A liquid purifying apparatus comprising the drainage amount changing device according to claim 1 arranged in a purifying path. 9. The method according to claim 8, wherein a sedimentation tank for sedimenting and separating the solid content of the introduced liquid, a filtration tank for filtering the liquid supplied from the sedimentation tank with a filter, and a supply from the filtration tank. A liquid purifying apparatus sequentially comprising the above-mentioned liquid amount changing device for changing the amount of liquid discharged.