JPH076298B2 - Circulating water tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used as a circulating pool for swimming training, athlete training training guidance, or for testing hydrodynamic phenomena related to ships and marine structures. , A circular water tank for observing and measuring with a scale model.

[Prior Art] In recent years, the practice method of swimming has also come to adopt a scientific and efficient method, and a water flow generator for circulating water in a circulation channel having an observation part is provided, A part of the circulating water tank has been put to practical use so that swimming exercises and training can be performed at the observation section.

[Problems to be Solved by the Invention] However, the conventional circulation type water tank described above has a large size. In other words, this is because various turbulence occurs due to water being circulated in the water tank body, so in order to make the flow uniform in the observation part and to remove bubbles generated in the observation part. , Take a large size of the tank body,
This is because it was necessary to provide a sufficient rectifying section and a bubble removal space.

In view of the above situation, the present invention is to provide a swirling water tank that is small in size and good in performance by making ingenuity in the rectification section and the bubble removal section.

[Means for Solving Problems] The present invention configures a vertical circulation type water tank main body from upper and lower water channels and front and rear curved water channels that connect the upper and lower water channels.
The upper water channel and the bottom surface are flat with no steps over the entire length,
The upper wall of the rear curved water channel is made a gentle upward slope, the observation section with the upper opening is provided in the upper water channel, and the rear wall of the opening edge flange forming the upper opening of the observation section is upstream of the observation section. Side down to provide a wave-dissipating structure on the overhanging portion, a plurality of water flow generating impellers are arranged in parallel in the lower water channel, the front and rear curved water channels, the gap from the inside to the outside. The flow guide plates are arranged so as to be wide, and the flow guide plates in the curved water channel are set to have a length from the front curved water channel inlet to the outlet, and the outermost flow guide plate of the flow guide plates in the rear curved water channel is The upstream end is arranged so as to extend downward from the contact point of the water surface with respect to the upper wall surface of the rear curved water channel, and the downstream end of the outermost guide plate is brought close to the rear wall surface of the rear curved water channel. The stagnation part of the water flow is formed on the outer side of the outermost diversion plate by forming the throttle part. And the bubble discharge port provided in the starch viewed portion above the rear curved water path walls, further between the said curved canals and the upper water passage has a configuration in which established the rectifier.

[Operation] A water flow is generated by the rotation of the impeller, the generated water flow flows from the lower water channel to the upper water channel through the front curved water channel, and is further sucked and circulated by the impeller through the rear curved water channel.
At this time, the water flow is rectified by the flow guide plate and the rectifying device in the front curved water channel, respectively, and moreover, since the bottom surface of the upper water channel is a flat surface without steps, it is a uniform flow without standing waves to the upper water channel. Sent. The water flow sent to the upper canal is
Even if the water surface undulates due to the movement of the swimmer in the observation unit and collides against the rear wall of the opening edge flange to break the waves, the wave-eliminating structure eliminates the bubbles at the time of collision and attenuates the rebounding force. Further, the water surface of the water flow flowing into the rear curved water channel from the observation part smoothly flows along the upper wall surface of the rear curved water channel. Further, the bubbles generated in the observation section pass through the outside of the outermost peripheral flow guide plate to reach the stagnation portion, where they are naturally degassed from the bubble discharge port.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1 and FIG. 2, 1 is a vertical circulating flow type circulating water tank main body installed via a base 2, and connects the upper water channel 3 and the lower water channel 4 with the upper and lower water channels 3 and 4. It is mainly composed of a front curved water channel 5 and a rear curved water channel 6, and the bottom surface 3'of the upper water channel 3 is a flat plane parallel to the upper surface 4'of the lower water channel 4 and the bottom surface 3 ' The curved water passages 5 and 6 between the upper surface 4'and the upper surface 4'are continuously formed by arcuate guide portions 5'and 6 '.

The upper water channel 3 has an observation window 7 on the side wall portion of the water tank body 1, and an upper portion is opened to form a free water surface. Also, the rear wall portion of the opening edge flange 9 (the downstream side wall portion 9 ′ is projected downward to the upstream side, which forms the upper opening of the observation portion 8, and the wave-dissipating structure is provided in the width direction of the water tank body 1 on the protruding portion. A plurality of extending wave-dissipating ridges 10 are provided.

In the lower water channel 4, a plurality of (three in the figure) water flow generating impellers 11 are provided at the upstream end portion, that is, the rear curved water channel 6 side end position.
Are provided so that they can be rotationally driven by a drive device 12 installed outside the water tank body 1, and a diffuser 13 for changing the cross section from a circle to a corner is arranged at the downstream portion of each impeller 11.

In the front and rear curved water channels 5 and 6, respectively, the curved-shaped flow guide plates 14 and 1 are arranged so that the distance between them gradually increases from the inside to the outside of the channel.
5 is installed, and a uniform mesh rectifying honeycomb board 16 is provided at the boundary between the front curved water channel 5 and the upper water channel 3.
Further, the flow guide plate 14 in the front curved water channel 5 has a length extending from the inlet of the front curved water channel 5 to the outlet thereof. When the height of the outlet of the water channel 5 is H (= water depth) and the height of the inlet of the water channel 5 is D, the distance between the flow guide plates 14 in the front curved water channel 5 is, for example, a = 0.4H, b = 0.28H, c = 0.18H, d = 0.14
H, a '= 0.36D, b' = 0.29D, c '= 0.19D, d' = 0.
It is as 16D.

Further, the outermost flow guide plate 15 'of the flow guide plates 15 installed in the rear curved water channel 6 is located at a position where the upstream surface of the water guide plate 15' is in contact with the water tank body upper wall surface 1a of the rear curved water channel 6. (contact
20) is arranged so as to extend upstream by a dimension X and downward from the horizontal, while the downstream end position is appropriately brought close to the water tank body rear wall surface 1b of the rear curved water channel 6 to form the throttle portion 17. By forming the narrowed portion 17, a stagnation portion 19 of the water flow is formed outside the outermost flow guide plate 15 ′, and a bubble discharge port for discharging bubbles present in the stagnation portion 19 18
Is bored in the water tank body upper wall surface 1a of the rear curved water channel 6. In addition, the upper wall surface of the aquarium body of the rear curved water channel 6 in contact with the water surface
1a has an upward slope of 3 to 5% toward the observation unit 8 so as to reduce the generation of bubbles at the contact point 20 with the water surface.
The narrowed portion 17 has a gap of about 1 / 8H with respect to the water depth H of the observation portion 8.

With such a configuration, a water flow is generated by rotationally driving each impeller 11 by the drive device 12, and the generated water flow is accelerated in the lower water channel 4 via the diffuser 13,
The accelerated water flow is the front curved water channel 5 and the straightening honeycomb board.
It is sent to the upper water channel 3 through 16 and further passed through the rear curved water channel 6 to be absorbed by each impeller 11 and thus the water flow circulates.

In the above description, since three impellers 11 are arranged in parallel in the width direction of the water tank body 1, the total height of the water tank body 1 can be made lower than that of a conventional circulation type water tank in which only one impeller is normally installed. Further, each impeller 11 has a diffuser 13
When the divergence angle of the diffuser 13 is the same as that of the conventional one, the length of the diffuser 13 becomes short and the total length of the water tank body 1 becomes short.

Further, the water flow flowing from the lower water channel 4 into the front curved water channel 5 is sent as a uniform flow into the upper water channel 3 through between the flow guide plates 14. That is, it is generally known that the flow velocity distribution of the fluid flowing around the arc is fast on the inner side and slow on the outer side, but in the present invention, it is arranged in the front curved water channel 5 and the interval between the curved water guiding plates 14 is set. , The inner side is set densely and the outer side is set sparse, and moreover, since the water guide plate 14 has a length extending from the inlet to the outlet of the water channel 5, each water guide plate 14 is regarded as one independent water channel, and Various losses (friction loss,
(Loss due to bending) can be made equal, and the flow velocity distribution can be approximated uniformly. Moreover, by installing the rectifying honeycomb board 16 having a uniform mesh, such an effect can be further enhanced.

Further, in the upper water channel 3, since the bottom surface 3'is formed as a flat surface over the entire length so that the water depth does not change, a standing wave is not generated on the free water surface in the observation unit 8 and the observation unit The flow uniformity at 8 can be further improved. Further, since the upstream end of the bottom surface 3'of the upper water channel 3 and the upper surface 4'of the lower water channel 4 are connected by the arcuate guide portions 5'and 6 ', flow separation does not occur.

By the way, in the observation section 8, swimming exercises or a hydrodynamic test using a model of a ship are carried out. At this time, the water surface undulates, and this collides with the rear wall 9'of the opening edge flange 9 and breaks waves. In this case, air bubbles are generated or bounce off and overflow to the outside of the water tank. However, in the present invention, since the wave-dissipating ridge 10 is provided on the overhanging portion of the rear wall portion 9 ', the air bubbles are erased and the bounce force is increased. Is dampened, and the inclusion of bubbles in the rear curved water channel 6 and the overflow of water out of the water tank are prevented. Therefore, the observation section 8
Therefore, it is possible to prevent the occurrence of standing waves in the observation unit 8 due to the decrease in the amount of water without hindering the uniformity of the flow in the flow.

Therefore, the water flow flowing through the upper water channel 3 is stable, and the observation by the observation unit 8 can be performed accurately and stably.

Further, the water flow that has passed through the observation unit 8 is guided to the rear curved water channel 6, and the water flow of the water surface portion collides with the water tank body upper wall surface 1a of the rear curved water channel 6. However, in the present invention, since the water tank body upper wall surface 1a has an upward slope of 3 to 5% with respect to the water surface, the collision force of the water flow is buffered, and the water flow contacts the water tank body upper wall surface 1a so as to slide in an extremely acute angle. Then, the flow is followed, and it is possible to generate almost no bubbles in this portion. On the other hand, in the observation unit 8, bubbles are generated due to the practice of swimming and the movement of the boat model itself. Thus, in the bubbles generated in the observation section 8, the upstream end of the outermost flow guide plate 15 'in the rear curved water channel 6 extends upstream from the water flow contact 20 of the water tank body upper wall surface 1a, and Since it is arranged downward, it passes through the outside of the outermost flow guide plate 15 'and enters the rear curved water channel 6. On the outside of the outermost flow guide plate 15 ', a throttle portion 17 is formed between the downstream end of the outermost flow guide plate 15' and the rear wall surface 1b of the water tank main body to reduce the flow velocity of the water flow. Since the stagnation part 19 is formed, the stagnation part 19
The air bubbles in the water flow that has flowed into the air are naturally exhausted from the air bubble outlet 18 without using a vacuum pump. The water flow after deaeration passes through the throttle portion 17 and is returned to the lower water channel 4 side.

As described above, by reducing the flow velocity of the water flow containing bubbles, the bubble removal section can be shortened and the length of the water tank body 1 can be shortened.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the circulating water tank of the present invention, the following excellent effects can be obtained.

(I) Since the plurality of impellers for water flow generation are arranged in parallel, the height of the water tank body can be reduced.

(Ii) In the front curved water channel, a flow guide plate is arranged so that the distance from the inlet to the outlet of the water channel is widened from the inner side to the outer side, and rectification is performed at the boundary between the front curved water channel and the upper water channel. Since the device is provided, the uniformity of the flow in the observation section can be ensured in a short rectification section, and the head loss can be reduced.

(Iii) Since the bottom surface of the upper water channel is a flat surface without steps over the entire length, it is possible to suppress the generation of standing waves and further improve the uniformity of flow.

(Iv) The rear wall of the opening edge flange that forms the upper opening of the observation section is projected downward to the upstream side of the observation section, and the wave-dissipating structure is provided on the overhanging section. Even if the water surface undulates due to movement or the like and collides with it, it is possible to eliminate the bubbles generated at this time and attenuate the rebounding force, and to prevent the inclusion of bubbles in the rear curved water channel and the overflow of water outside the tank, It is possible to prevent the flow uniformity in the observation section from being hindered and the promotion of standing wave generation.

(V) Since the upper wall surface of the rear curved water channel has a gentle upward slope at the contact point with the water surface, it is possible to almost completely eliminate the generation of bubbles in this portion.

(Vi) Of the guide plates arranged in the rear curved channel, the upstream end of the outermost guide plate is arranged downward so that
The bubbles generated in the observation section can be guided to the outside of the outermost flow guide plate without being circulated.

(Vii) Since a restriction can be formed between the rear wall surface of the rear curved channel and the downstream end of the outermost guide plate to form a stagnation part having a small flow velocity outside the outermost guide plate. The residence time of the bubbles that have flowed into the stagnation portion can be made long, and the bubbles can be efficiently naturally discharged without using a vacuum pump.

(Viii) The bubble removal section can be shortened from the above items (iv) to (vii).

(Ix) Therefore, it is possible to perform the observation in the observation section with high accuracy and to reduce the size of the entire water tank.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional side view showing the whole circulation type water tank of the present invention, and FIG. 2 is a II-II arrow view of FIG. 1 is an aquarium body, 1a is an upper wall surface, 1b is a rear wall surface, 3 is an upper water channel, 3'is a bottom surface, 4 is a lower water channel, 5 is a front curved water channel, 6
Is a rear curved channel, 8 is an observation part, 9 is an opening edge flange,
Reference numeral 9'is a rear wall portion, 10 is a wave-dissipating ridge, 11 is an impeller, 12 is a drive device, 14 and 15 are flow guide plates, 15 'is an outermost flow guide plate, 16 is a rectifying honeycomb plate, 17 is a throttle part. , 18 is a bubble discharge port, 19 is a stagnation part, and 20 is a contact point.

Claims (1)

[Claims] 1. A vertical circulation type water tank main body is composed of upper and lower water channels and front and rear curved water channels that connect the upper and lower water channels, and the upper water channel and the bottom surface are flat with no step over the entire length, and the rear curve is curved. The upper wall surface of the water channel is made a gentle upward slope, the observation section with the upper opening is provided in the upper water channel, and the rear wall of the opening edge flange that forms the upper opening of the observation section is located upstream of the observation section. A wave-dissipating structure is provided on the projecting portion by projecting downward, a plurality of water flow generating impellers are arranged in parallel in the lower water channel, and the front and rear curved water channels are widened from the inner side toward the outer side. Each of the flow guide plates is arranged such that the flow guide plate in the curved water channel has a length from the front curved water channel inlet to the outlet, and the upstream side of the outermost flow guide plate of the flow guide plates in the rear curved water channel. The end is upstream from the contact point of the water surface with respect to the upper wall surface of the rear curved waterway. Is arranged so as to extend downward to the outermost guide plate, and the downstream end of the outermost guide plate is brought closer to the rear wall surface of the rear curved water channel to form a constricted portion, thereby forming a stagnation part of the water flow on the outer side of the outermost guide plate. And a bubble outlet is provided at a position above the stagnation portion of the upper wall of the rear curved water channel, and a rectifying device is installed between the curved water channel and the upper water channel.