JPH0218122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention basically provides a completely new method for removing air bubbles that is particularly effective in removing air bubbles from a liquid flowing at high speed, and the method. The present invention relates to the development of a bubble removal device suitable for carrying out the test, and more specifically, to the development of a circulating water tank for high flow rate flow tests using the bubble removal device.

[Conventional technology]

For example, towing water tanks (stationary storage In recent years, instead of the method of moving the test object itself underwater, the equipment cost and operating cost are low, the test can be performed easily and in a short time, and if desired, it can be performed continuously for any length of time. Circulation water tanks (a method in which water is circulated around the test object in a fixed position), which allow testing to be carried out in a controlled manner, are becoming more widely used, and have achieved great results. ing.

By the way, this recirculation water tank for hydrodynamic testing is as follows:
For example, in a cavitation tank, pressurized water is filled in a circulating flow path consisting only of a tubular closed flow path, and the blockage measurement is performed without a free water surface formed in a part of the circulating flow path. / Except for special types of tests in which a propeller or the like is placed in the observation section, in general, a horizontal groove-like open channel section forming the measurement/observation section has a tubular closed channel section and a free water surface. A type having a so-called open measurement/observation part in which a flow velocity generating device for circulating water in the circulation flow path is provided in the middle of the tubular closed flow path section. It's normal.

Therefore, since water is forced to circulate in such a recirculation water tank for flow force testing, it is particularly important to avoid damage to the boundary between the open measurement/observation section and the tubular closed flow path section downstream of the test object. Air bubbles tend to get mixed into the circulating water around the area, and these air bubbles are a major obstacle to improving test accuracy.

Therefore, such a circulation water tank for flow force testing is designed to at least not cause flow rate disturbance to the circulating water flowing into the so-called open measurement/observation section, and to prevent air bubbles contained in the circulating water flowing into the measurement/observation section. As shown in Fig. 11, in order to minimize the
Bubbles floating spaces b, b and floating bubble suction devices c, c are provided on the upstream and downstream sides of the measurement/observation section a, or a large number of bubble adhesion plates d... and adhered bubble suction devices are provided on the downstream side of the measurement/observation section a. The method used was to provide e.

[Problem that the invention seeks to solve]

However, in the conventional bubble removal device as described above, the flow rate of the circulating water is 2 to 3 m/sec.
However, if the flow rate of the circulating water becomes higher than that, the floating force and adhesion force of the bubbles will be overcome by the sweeping force due to the flow rate, and the bubble removal function will be reduced. becomes extremely low. Therefore, as the flow rate of the circulating water increases, the length of the flow path from the boundary between the measurement/observation section a and the downstream tubular closed flow path section f to the downstream bubble floating space b, Alternatively, the length of the air bubble adhesion plate d must be made extremely long, resulting in an extremely large size of the recirculating water tank for flow test, which in turn leads to a significant increase in manufacturing costs and running costs. becomes.

Due to these circumstances, the flow rate of circulating water has become difficult from both the practical and research sides.
Although the realization of a recirculation water tank for high-velocity flow tests of approximately 10 m/sec is currently highly desired, this goal has not yet been achieved.

The present invention has been made in view of such conventional circumstances, and its purpose is to be able to effectively remove bubbles from a high-speed flowing liquid even when the object is a high-speed flowing liquid. To develop a bubble removal method, and to develop a relatively simple and compact bubble removal device that is suitable for carrying out the bubble removal method and does not require a special power source, and further, By effectively utilizing the air bubble removal device, the object of the present invention is to achieve the realization of a recirculation water tank for high flow rate flow tests, which was previously thought to be practically impossible.

[Means for solving problems]

In order to achieve the above object, the method for removing air bubbles from a flowing liquid according to the first invention includes the following steps: A flowing liquid containing air bubbles is introduced into the cylindrical container from the outside of a cylindrical container that is set substantially vertically. is introduced from the horizontal tangential direction substantially along the inner surface of the cylindrical container, and the flowing liquid containing the bubbles is horizontally rotated by itself within the cylindrical container, thereby reducing the specific gravity difference between the liquid and the gas. Utilizing the basic principle of centrifugation, air bubbles in the flowing liquid are collected in the center of the cylindrical container, and the liquid from which air bubbles have been removed is collected in the periphery of the cylindrical container. Bubbles and a liquid containing a large amount of bubbles collected in the center of the container, and a liquid from which air bubbles have been removed and collected in the periphery of the cylindrical container are separately led out of the cylindrical container. It is distinctive in that it adopts the following method.

Furthermore, the device for removing air bubbles from a flowing liquid according to the second invention is configured to:
A channel for introducing a flowing liquid containing bubbles into the cylindrical container from the horizontal tangential direction substantially along the inner surface of the cylindrical container is introduced from outside the cylindrical container, and is connected to the upper part of the cylindrical container. is provided with an opening for leading out of the cylindrical container air bubbles that are collected in the center of the cylindrical container and rise by themselves due to buoyancy, and that the air bubbles are removed from the center of the bottom of the cylindrical container. Connecting and guiding a flow path for leading out of the cylindrical container the liquid containing a large amount of bubbles collected in the center of the cylindrical container, and further connecting and leading out the liquid containing a large amount of bubbles collected in the center of the cylindrical container, The cylindrical container has a feature in that a flow path is connected to lead out the liquid from which air bubbles collected around the periphery of the cylindrical container have been removed to the outside of the cylindrical container.

Furthermore, the circulation water tank for high flow rate flow tests according to the third invention includes a circulation flow path comprising a tubular closed flow path portion and a horizontal groove-like open flow path portion forming a measurement/observation portion having a free water surface. A recirculation water tank for high flow rate flow testing, in which a high flow rate generation device for circulating water at high speed is installed in the middle of the tubular closed channel portion, and the horizontal groove forming the measurement/observation section between the tubular open channel portion and the tubular closed channel portion downstream thereof,
interposing at least one cylindrical container arranged substantially vertically to direct the flowing liquid containing air bubbles from the horizontal groove-like open channel portion forming the measurement/observation section into the cylindrical container; By introducing the fluid from the horizontal tangential direction substantially along the inner surface of the cylindrical container, the flowing liquid containing the bubbles is caused to rotate horizontally by itself within the cylindrical container, resulting in centrifugation based on the difference in specific gravity between the liquid and the gas. Utilizing the principle of separation, the air bubbles in the flowing liquid are collected in the central part of the cylindrical container, and the liquid from which air bubbles have been removed is collected in the peripheral part of the cylindrical container, and , an opening is provided in the upper part of the cylindrical container for guiding out of the cylindrical container air bubbles that are collected in the center of the cylindrical container and rise by themselves due to buoyancy, and further,
A flow path is connected and led out from the center of the bottom surface of the cylindrical container to lead out of the cylindrical container a liquid containing a large amount of bubbles collected in the center of the cylindrical container, and From the bottom periphery or side of the cylindrical container, the liquid collected on the cylindrical container from which air bubbles have been removed is transferred to the horizontal groove-shaped open channel portion forming the measurement/observation section. It is characterized in that it is configured to lead out to the tubular closed flow path portion on the downstream side.

[Effect]

The effects achieved due to this characteristic configuration are as follows.

That is, according to the method for removing air bubbles from a flowing liquid according to the first invention, a flowing liquid containing air bubbles is introduced into a vertically erected cylindrical container to release its own flowing energy. By utilizing the principle of centrifugal separation based on the difference in specific gravity between liquid and gas, the bubbles and the liquid containing a large amount of bubbles are transferred to the cylindrical container by horizontal rotation of the liquid. On the other hand, the liquid from which air bubbles have been removed will be collected at the periphery of the cylindrical container. The bubbles are removed from the flowing liquid containing bubbles very easily and reliably, without requiring any special power source, and the bubbles are drawn out separately from the cylindrical container. It is possible to effectively separate and take out a liquid that no longer contains any or almost no . The bubble removal effect is more reliably and effectively achieved when the flowing liquid containing bubbles has a large flow energy, that is, when its flow velocity is high. It is particularly effective for high-flowing liquids that cannot be subjected to bubble removal methods.

In addition, the device for removing air bubbles from a flowing liquid according to the second invention uses a simple cylindrical container that is not equipped with a special power source, and collects air bubbles in the center of the container and rises by itself due to buoyancy. In addition to providing an opening for leading out of the cylindrical container, a channel for introducing a flowing liquid containing bubbles into the cylindrical container, and a center in the cylindrical container. A flow path for leading a liquid containing a large amount of air bubbles collected around the cylindrical container to the outside of the cylindrical container, and a flow path for leading the liquid containing a large amount of air bubbles collected around the periphery of the cylindrical container to the outside of the cylindrical container. It is possible to suitably carry out the method of the first invention, which exhibits the above-mentioned excellent bubble removal effect, even though it has a very simple and compact configuration in which the method is connected to a flow path for leading out to the air. it is obvious.

The recirculation water tank for high flow rate flow tests according to the third invention also has the above-mentioned structure between the horizontal groove-shaped open channel part forming the open measurement/observation section and the tubular closed channel part on the downstream side thereof. As such, it has a very simple and compact configuration, and because it uses the second invention device that can exhibit excellent bubble removal effects, the length of the flow path on the downstream side of the measurement/observation section can be extremely shortened. The measurement/observation section can be made extremely compact by shortening the length of the device, while still being able to operate the measurement/observation section even when circulating water at a high flow rate of about 10 m/sec, which was previously thought to be practically impossible. The structure was able to sufficiently reduce the number of bubbles contained in the circulating water flowing into the tank.

[Example] Hereinafter, specific examples of the present invention will be described based on the drawings.

FIGS. 1A and 1B are a longitudinal sectional side view and a lateral plan view for explaining the basic principle of the method for removing air bubbles from a flowing liquid according to the first invention, and as shown in the figures, substantially A cylindrical container 1 with an open top is vertically installed in the cylindrical container 1, and a flowing liquid FA containing bubbles is directed from a horizontal tangential direction substantially along the inner surface of the cylindrical container 1, as shown by an arrow X. , by introducing the fluid liquid FA containing air bubbles from the outside to the inside of the cylindrical container 1 and causing it to horizontally rotate on its own as shown by the arrow Y within the cylindrical container 1, thereby reducing the specific gravity between the liquid and the gas. Utilizing the principle of centrifugation based on difference, the air bubbles A in the flowing liquid FA are collected in the center of the cylindrical container 1, and the liquid from which the air bubbles have been removed is collected in the periphery of the cylindrical container 1. F is collected, and the cylindrical container 1
The bubbles A that are collected in the center of the container and rise by themselves due to buoyancy are released into the atmosphere from the upper opening 1a of the cylindrical container 1 as shown by arrow Z1, and
The liquid FA' containing a large amount of air bubbles collected in the center of the cylindrical container 1 is led out of the cylindrical container 1 from the center of the bottom surface of the cylindrical container 1, as shown by arrow Z2, and further , the liquid F from which air bubbles collected around the periphery of the cylindrical container 1 have been removed is shown by the arrow Z
As shown in 3..., air bubbles were completely or almost completely removed from the flowing liquid FA containing air bubbles by the method of leading out of the cylindrical container 1 from the bottom circumference of the cylindrical container 1. The liquid F is separated and taken out.

In addition, as shown by arrows Z3' in FIG. It may also be led out of the container 1.

Further, as shown in FIG. 3, the cylindrical container 1
The liquid FA' containing a large amount of bubbles is collected in the center of the cylindrical container 1 and then led out of the cylindrical container 1. For example, by a small pump P, the liquid FA' is returned to the cylindrical container 1 and is pumped into the cylindrical container 1. The liquid containing a large amount of bubbles is returned from the tangential direction along the inner surface of the container 1.
It is preferable to remove air bubbles from FA' again, since the liquid will not be wasted.

Furthermore, as shown in FIG. 4, the flow velocity of the liquid FA' containing a large amount of air bubbles, which is collected in the center of the cylindrical container 1 and then led out of the cylindrical container 1, becomes extremely low. By taking advantage of the fact that the air bubbles are present in the liquid, for example, a liquid containing a large amount of air bubbles can be removed using a conventional natural floating type or adhesion type simple air bubble removal mechanism Q.
Bubbles A are removed from FA' as shown by arrow Z4, and liquid F is obtained as shown by arrow Z5.
may be configured such that air bubbles led out from the bottom circumference or side of the cylindrical container 1 as indicated by the arrow Z3 or Z3' are made to join the removed liquid F.

5A and 5B are a longitudinal sectional side view and a lateral plan view showing the basic configuration of an apparatus for removing air bubbles from a flowing liquid according to the second invention for suitably carrying out the method of the first invention, and FIG. As shown in the figure, a fluid liquid FA containing air bubbles is introduced into a cylindrical container 1 that is set substantially vertically from a horizontal tangential direction substantially along the inner surface of the cylindrical container 1. By introducing and connecting the tubular flow path 2 for the purpose from the outside of the cylindrical container 1, and causing the fluid liquid FA containing bubbles to horizontally rotate on its own as shown by arrow Y within the cylindrical container 1, Utilizing the principle of centrifugation based on the difference in specific gravity between liquid and gas, the bubbles A in the flowing liquid FA are collected in the center of the cylindrical container 1, and are transferred to the periphery of the cylindrical container 1. configured to collect liquid F from which air bubbles have been removed;
At the top of the cylindrical container 1, the cylindrical container 1
An opening 1 through which air bubbles A, which are collected in the center of the interior and rise by themselves due to buoyancy, can be released to the outside of the cylindrical container 1.
A liquid containing a large amount of bubbles is collected from the center of the bottom of the cylindrical container 1 to the center of the cylindrical container 1.
A tubular flow path 3 for guiding FA' out of the cylindrical container 1 is connected and led out, and furthermore, from a large number of small holes 1b bored in the bottom circumference of the cylindrical container 1,
A liquid F from which air bubbles collected around the periphery of the cylindrical container 1 have been removed is guided out of the cylindrical container 1 through a chamber 1B formed below the cylindrical container 1. A tubular flow path 4 is connected and led out. In the figure, 3A and 4A denote a flow path 3 for leading out the liquid FA' containing a large amount of air bubbles to the outside of the cylindrical container 1, and a flow path 3 for guiding the liquid F from which the air bubbles have been removed to the cylindrical container 1. This is a flow rate control valve interposed in the flow path 4 for leading out.

In addition, in order to lead out the liquid F from which air bubbles collected around the periphery of the cylindrical container 1 have been removed into the chamber 1B formed below the cylindrical container 1, the inside of the cylindrical container 1 is Instead of drilling a large number of small holes 1b... around the bottom of the container, a large number of bypass channels are led out from the side of the cylindrical container 1, as shown by dotted lines 1c... in Fig. 5A. It may be configured as follows. Furthermore, as shown in FIG. 6, instead of the large number of small holes 1b, a plurality of slits 1d may be formed around the bottom of the cylindrical container 1.

Further, as shown in FIGS. 7 and 8, a channel 2 for introducing the fluid liquid FA containing bubbles into the cylindrical container 1 is connected to the cylindrical container 1. If, instead of the tubular one, an open top groove channel is constructed in which the flowing liquid FA containing air bubbles can form a free surface s, the top open channel channel 2 will also have a certain amount of space in advance. Spontaneous release of bubbles can be expected.

Furthermore, as shown in FIG. 7, the cylindrical container 1
A flow path 3 is introduced into the cylindrical container 1 by a small pump P, for example, for leading out the liquid FA' containing a large amount of bubbles, which is connected and led out from the center of the bottom surface of the cylindrical container 1. By returning the connected flowing liquid FA containing air bubbles to the channel 2 for introducing it into the cylindrical container 1, the liquid FA' containing a large amount of air bubbles is guided back into the cylindrical container 1. It is preferable to remove the bubbles again from the liquid FA' containing a large amount of bubbles, since the liquid will not be wasted.

Furthermore, as shown in FIG. 8, the flow velocity of the liquid FA' containing a large amount of bubbles, which is collected in the center of the cylindrical container 1 and then led out of the cylindrical container 1, becomes extremely low. Taking advantage of this fact, for example, a conventional natural floating type or adhering type simple bubble removing mechanism Q is interposed in the middle of the flow path 3, and the simple bubble removing mechanism Q removes a large amount of the bubbles. Obtain liquid F by removing air bubbles A from liquid FA′ contained in
The liquid F may be configured to join the liquid F flowing out from the bottom periphery (or side) of the cylindrical container 1 from which air bubbles have been removed.

In the apparatus shown in FIG. 8, a suction pump 5 is attached to the gas release opening 1a formed in the upper lid 1A of the cylindrical container 1 to create a negative pressure inside the cylindrical container 1. This not only promotes the release of gas A from the liquid, but also actively releases the gas A into the atmosphere.

In addition, in the apparatus shown in FIG. 8, the bottom surface of the cylindrical container 1 having the small holes 1b for deriving the liquid F is inclined to one side, and the bottom surface of the cylindrical container 1 is inclined from the highest part in the chamber 1B below. A communicating pipe 6 is led out which reaches near the upper end of the cylindrical container 1. Thereby, even if a small amount of gas should remain in the liquid F in the chamber 1B, the remaining gas can be released into the atmosphere through the communication pipe 6. Furthermore, if the communicating tube 6 is made of a transparent material, it is convenient because the liquid level inside the cylindrical container 1 can also be known.

FIGS. 9A, 9B, and 9C show a recirculation water tank for high flow rate flow tests according to the third invention, which is constructed by applying the second invention apparatus described above.

That is, as shown in FIG. 9A, a tubular closed channel portion 7 and a free water surface S are placed on a base 6 erected on the ground G.
A circulation channel C comprising a horizontal groove-like open channel portion 2A forming a measurement/observation section M is placed in the vertical direction, and water is fed into the circulation channel C at high speed (the maximum circulation flow velocity is A high flow rate generating device 8 consisting of an impeller for circulating the flow at a rate of about 10 m/sec),
It is provided in the middle of the tubular closed flow path portion 7 to constitute a so-called vertical circulation type recirculation water tank for high flow rate flow test.

Between the horizontal groove-shaped open channel portion 2A forming the measurement/observation section M and the tubular closed channel portion 7 on the downstream side thereof, a structure as shown in FIGS. 9B and 9C is provided. A bubble removing device K is interposed. That is,
A pair of cylindrical containers 1, 1 installed substantially vertically between the horizontal groove-shaped open flow path portion 2A and the tubular closed flow path portion 7 on the downstream side thereof are connected to the horizontal groove-shaped open flow path portion 2A. The two cylindrical containers 1 and 2A are arranged symmetrically with respect to the channel portion 2A, and the fluid liquid FA containing bubbles flowing at high speed from the horizontal groove-like open channel portion 2A is contained in the two cylindrical containers 1 and 2A.
1 from a horizontal tangential direction substantially along the inner surface of each cylindrical container 1, the fluid liquid FA containing bubbles is horizontally rotated by itself as shown by arrow Y within each cylindrical container 1. Let it flow, liquid-
Utilizing the principle of centrifugation based on the difference in specific gravity between gases, the bubbles A in the flowing liquid FA are collected in the center of each cylindrical container 1, and are also transferred to the periphery of each cylindrical container 1. The liquid F from which air bubbles have been removed is collected, and the upper part of each cylindrical container 1 contains air bubbles A that are collected in the center of each cylindrical container 1 and rise by themselves due to buoyancy. An opening 1a is provided for leading out of each cylindrical container 1, and further, from the center of the bottom inside each cylindrical container 1,
A flow path 3 for leading out the liquid FA' containing a large amount of air bubbles collected in the center of each cylindrical container 1 to the outside of each cylindrical container 1 is connected and led out. From the large number of small holes 1b formed on the bottom circumference (or side) of each cylindrical container 1, the liquid F from which air bubbles collected at the circumference of each cylindrical container 1 have been removed is transferred to both cylindrical containers 1. It is configured to lead out to the tubular closed flow path section 7 on the downstream side of each cylindrical container 1 via a common pre-throttled duct 4A for the containers 1,1.

Furthermore, the flow path 3 for leading out the liquid FA' containing a large amount of air bubbles connected and led out from the center of the bottom of each cylindrical container 1 is a single natural floating type or adhesive type. It is introduced and connected to the tubular closed flow path portion 7 on the downstream side of the cylindrical container 1 through a simple air bubble removing mechanism Q of the formula, and the simple air bubble removing mechanism Q allows the container to contain a large amount of air bubbles. Liquid F obtained by removing bubbles A from liquid FA′ is
It is configured to be returned to the tubular closed flow path section 7.

Further, in the figure, reference numeral 9 indicates the introduction of the flowing liquid FA containing bubbles from the horizontal groove-shaped open channel portion 2A forming the measurement/observation section M into both the cylindrical containers 1, 1 in a substantially equal manner. 10 is a corner vane, 11, 11 is a naturally floating bubble suction/removal mechanism, 12, 12 is an observation window provided around the measurement/observation section M, and 13 is the measurement/observation section M.
and 14 includes an electromagnetic opening/closing valve V that automatically opens and closes based on the water level detection result of the water level detector 13 to maintain the water level in the measurement/observation section M at a predetermined value. This is the make-up water flow path.

As shown in FIG. 10, a pair of left and right impellers serving as the high flow rate generating device 8 are provided, and the two cylindrical containers 1, 1 and a bifurcated tubular closed flow path portion 7' housing the two impellers are provided. 7′ and
They may also be configured to be connected via special tip drawing ducts 4B, 4B.

〔Effect of the invention〕

As is clear from the detailed description above, according to the method of the first invention, a flowing liquid containing bubbles is introduced into a vertically erected cylindrical container to release its own flowing energy. By utilizing the cylindrical container and causing it to flow horizontally under its own power,
Based on the principle of centrifugation based on the difference in specific gravity between liquid and gas, bubbles and a liquid containing a large amount of bubbles are collected in the center of the cylindrical container, while the liquid from which air bubbles have been removed is collected around the periphery of the cylindrical container. The bubbles and the liquid containing a large amount of bubbles and the liquid from which the bubbles have been removed are separately drawn out from within the cylindrical container, without requiring a special power source. , it is possible to very easily and reliably separate and extract a liquid from which air bubbles have been removed and which no longer contains any or almost no air bubbles from a flowing liquid containing air bubbles. The bubble removal effect is effective when the flowing liquid containing bubbles has a large flow energy, that is,
Since the method is more reliable and effective when the flow rate is high, the method of the present invention is particularly effective for high-flow rate flowing liquids that cannot be treated with conventional bubble removal methods.

Further, according to the second invention device, air bubbles that are collected in the center of a simple cylindrical container that is not equipped with a special power source and rise by themselves due to buoyancy are guided out of the cylindrical container. In addition to providing an opening in the cylindrical container, a channel is provided for introducing a flowing liquid containing target bubbles into the cylindrical container, and a flow path is provided for introducing the flowing liquid containing bubbles into the cylindrical container, and a channel for introducing the bubbles collected into the center of the cylindrical container. A flow path for leading a large amount of liquid out of the cylindrical container, and a flow path for leading out of the cylindrical container liquid from which air bubbles collected around the cylindrical container have been removed. is connected to
Although the method has a very simple and compact structure, the method of the first invention that exhibits the above-mentioned excellent bubble removal effect can be suitably implemented.

According to the circulating water tank for high flow rate flow tests according to the third aspect of the present invention, between the horizontal groove-shaped open channel portion forming the open measurement/observation section and the tubular closed channel portion on the downstream side thereof, As mentioned above, it has a very simple and compact configuration, and because it uses the second invention device that can exhibit excellent bubble removal effects, The length of the flow path leading to the channel section can be made extremely short, making the entire device extremely compact, while still achieving a speed of 10 m/sec, which was previously considered practically impossible.
Even when water is being circulated at extremely high flow rates, it has become possible to sufficiently reduce the amount of air bubbles contained in the circulating water flowing into the measurement/observation section.

As described above, the present invention provides a bubble removal method that can effectively remove bubbles from a high-speed flowing liquid even when the target is a high-speed flowing liquid, and the bubble removal method. It is possible to develop a simple and compact air bubble removal device that is suitable for This has been achieved by creating a recirculation water tank for high-velocity flow tests that can be constructed relatively simply, compactly, and inexpensively, which has long been desired from both sides.

[Brief explanation of drawings]

1 to 4 show an embodiment of the method for removing air bubbles from a flowing liquid according to the first invention,
Figures 1A and 1B are a schematic vertical side view and a schematic cross-sectional plan view for explaining the procedure of the basic embodiment, respectively;
2 to 4 are schematic longitudinal sectional side views for explaining the procedures of different embodiments. Moreover, FIGS. 5 to 8 show specific embodiments of the device for removing air bubbles from flowing liquid according to the second invention, and FIG. 5A is a longitudinal sectional side view of the basic embodiment;
FIG. 5B is a view taken along the line - in FIG. 5A, FIG. 6 is a cross-sectional plan view of another embodiment, and FIG. 7 and FIG. be. Moreover, FIGS. 9 and 10 show a specific embodiment of the recirculation water tank for high velocity flow test according to the third invention, and FIG. 9A is a partial cross-sectional overall schematic front view of the basic embodiment; Figure 9B is a view taken from the - line arrow in Figure 9A;
Figure 9C is a - line arrow view of Figure 9B, and
FIG. 10 is a side view of the main parts of another embodiment. FIG. 11 is a partially cross-sectional overall schematic front view for explaining the prior art. FA...Flowing liquid containing bubbles, A...Bubbles, F
...Liquid from which air bubbles have been removed, FA'...Liquid containing a large amount of air bubbles, 1...Cylindrical container, 1a...Bubble A
an opening for leading out of the cylindrical container 1, 2...
A channel for introducing a fluid liquid FA containing bubbles into the cylindrical container 1, 3...a liquid containing a large amount of bubbles
a flow path for leading FA' out of the cylindrical container 1, 4
. . . Channel for leading the liquid F from which air bubbles have been removed out of the cylindrical container 1, 2A . . . Horizontal groove-shaped open channel portion, 7 . . . Tubular closed channel portion, 9 . , s...Free surface, Q...Simplified bubble removal mechanism of natural floating type or adhesion type, S...Free water surface, M
...Measurement/observation section, C...Circulation channel.

Claims (1)

[Scope of Claims] 1. A flowing liquid containing air bubbles is introduced into the cylindrical container 1 from the outside of the cylindrical container 1 which is set up substantially vertically.
The FA is introduced from a horizontal tangential direction substantially along the inner surface of the cylindrical container 1, and the flowing liquid FA containing bubbles is horizontally rotated by itself within the cylindrical container 1, thereby creating a liquid-gas gap. Using the principle of centrifugation based on the difference in specific gravity, the cylindrical container 1
Bubbles A in the flowing liquid FA are collected in the center of the cylindrical container 1, and liquid F from which air bubbles have been removed is collected in the periphery of the cylindrical container 1. It is characterized in that the bubbles A, the liquid FA' containing a large amount of bubbles, and the liquid F from which the bubbles collected around the periphery of the cylindrical container 1 have been removed are separately led out of the cylindrical container 1. A method for removing air bubbles from a flowing liquid. 2 The bubbles A that are collected in the center of the cylindrical container 1 and rise by themselves due to buoyancy are released into the atmosphere from the upper part of the cylindrical container 1, and
A liquid containing a large amount of air bubbles that is collected in the center of the liquid.
FA' is led out of the cylindrical container 1 from the center of the bottom surface of the cylindrical container 1, and the liquid F from which air bubbles collected around the periphery of the cylindrical container 1 have been removed is transferred to the cylindrical container 1. 1. A method for removing air bubbles from a flowing liquid according to claim 1, wherein the bubbles are led out of the cylindrical container 1 from the bottom periphery or side of the cylindrical container 1. 3. The liquid FA' containing a large amount of air bubbles, which has been collected in the center of the cylindrical container 1 and then led out of the cylindrical container 1, is transferred back into the cylindrical container 1, substantially in the cylindrical shape. A method for removing air bubbles from a flowing liquid according to claim 1 or 2, wherein air bubbles are returned from a tangential direction along the inner surface of the container. 4 A flow path 2 is provided for introducing the fluid liquid FA containing bubbles into the cylindrical container 1 that is substantially vertically installed from a horizontal tangential direction substantially along the inner surface of the cylindrical container 1. , is introduced from the outside of the cylindrical container 1, and at the same time, the air bubbles A, which are collected in the center of the cylindrical container 1 and rise by themselves due to buoyancy, are connected to the cylindrical container 1 from the outside. An opening 1a is provided for leading out, and
A flow path 3 is provided from the center of the bottom of the cylindrical container 1 for leading out of the cylindrical container 1 the liquid FA' containing a large amount of bubbles collected in the center of the cylindrical container 1. Further, from the bottom periphery or side portion of the cylindrical container 1, the liquid F from which air bubbles collected on the periphery of the cylindrical container 1 have been removed is directed outside the cylindrical container 1. Channel 4 for deriving
A device for removing air bubbles from a flowing liquid, characterized in that the device is connected to and led out from a flowing liquid. 5. A patent in which the flow path 2 for introducing the fluid liquid FA containing air bubbles into the cylindrical container 1 is a top-open groove-like flow path in which the fluid liquid FA containing air bubbles can form a free surface s. An apparatus for removing air bubbles from a flowing liquid according to claim 4. 6. A flow path 3 for leading the liquid FA' containing a large amount of air bubbles from the center of the bottom of the cylindrical container 1 to the outside of the cylindrical container 1, and a flow path 3 for leading the liquid FA' containing a large amount of air bubbles to the outside of the cylindrical container 1. A device for removing air bubbles from a flowing liquid according to claim 4 or 5, wherein the bubbles are returned to the flow path 2 for introduction into the flowing liquid. 7. Simple air bubbles of a natural floating type or an attached type are installed in the middle of the flow path 3 for leading the liquid FA' containing a large amount of air bubbles from the center of the bottom of the cylindrical container 1 to the outside of the cylindrical container 1. An apparatus for removing air bubbles from a flowing liquid according to any one of claims 4 to 6, which is provided with a removal mechanism Q. 8 Horizontal groove-shaped open channel portion 2A forming a measurement/observation section M having a tubular closed channel portion 7 and a free water surface S
A high flow rate generation device 9 for circulating water at high speed in a circulation flow path C comprising and at least one cylindrical container standing substantially vertically between the horizontal groove-shaped open channel portion 2A forming the measurement/observation section M and the tubular closed channel portion 7 on the downstream side thereof. 1, the fluid liquid FA containing air bubbles from the horizontal groove-like open channel portion 2A forming the measurement/observation section M is introduced into the cylindrical container 1, and substantially the inside of the cylindrical container 1 is By introducing the liquid FA from the horizontal tangential direction along the inner surface, the liquid FA containing bubbles is caused to rotate horizontally by itself within the cylindrical container 1, and utilizes the principle of centrifugal separation based on the difference in specific gravity between liquid and gas. and collect the bubbles A in the flowing liquid FA to the center of the cylindrical container 1,
The structure is such that the liquid F from which air bubbles have been removed is collected around the periphery of the cylindrical container 1, and the upper part of the cylindrical container 1 has a buoyant force so that the liquid F is collected at the center of the cylindrical container 1. An opening 1a is provided to guide the air bubbles A that rise by themselves to the outside of the cylindrical container 1, and furthermore, the air bubbles A are collected from the center of the bottom surface of the cylindrical container 1 to the center of the cylindrical container 1. A flow path 3 is connected to lead out the liquid FA' containing a large amount of bubbles to the outside of the cylindrical container 1, and from the bottom circumference or side of the cylindrical container 1,
It is characterized in that the liquid F from which air bubbles collected around the periphery of the cylindrical container 1 have been removed is led out to the tubular closed flow path section 7 on the downstream side of the cylindrical container 1. Circulation water tank for high flow rate tests. 9 The cylindrical container 1 is provided in pairs on the left and right sides symmetrically with respect to the horizontal groove-shaped open channel portion 2A forming the measurement/observation section M. Circulation water tank. 10 The flow path 3 for leading out the liquid FA' containing a large amount of air bubbles from the center of the bottom of the cylindrical container 1 to the outside of the cylindrical container 1 is connected to a simple air bubble removal mechanism of a natural floating type or an adhesion type. The recirculation water tank for high flow rate flow tests according to claim 8 or 9, which is connected to the tubular closed flow path section 7 on the downstream side of the cylindrical container 1 via the cylindrical container 1.