JPH0257277A - Round current type water tank - Google Patents

Abstract

PURPOSE:To prevent water flow from exfoliation and enable the uniform distribution of flow speed to be made in an upper water path by disposing, in a front turning water path, bent water guide plates having length extending from an inlet to an outlet of said front turning water path such that gaps between the water guide plates is small in the inside, large in the outside, the inlet is wider then the outlet and the intermediate portions are wider than the inlet and outlet. CONSTITUTION:When an impeller 9 provided in a lower water path 4 lower than an upper water path is rotated by a drive unit 10, water in the lower water path 4 is sent to a front turning water path 5 to flow into flow paths 51, 52, 53, 54 partitioned by respective water guide plated 111, 112, 113. The respective flow paths 51, 52, 53, 54 have dimensions expanded little by little larger than those of respective inlets a1, a2, a3, a4, to the maximum in portions c1, c2, c3, c4 crossing a straight line of y=-ax and narrowed gradually to the dimensions of outlets b1, b2, b3, b4 of the respective water paths 51, 52, 53, 54 so that water flows having uniform head losses flow out of the respective outlets to form flows having uniform flow speed in the upper water path 3.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be used as a circulating pool for swimming practice, training and guidance for athletes, or for testing hydrodynamic phenomena related to ships, marine structures, etc. This relates to a circulating water tank for observation and measurement using a scale model.

[Prior Art] In recent years, swimming practice methods have become more scientific and efficient, and a water flow generator is installed to circulate water in a vertical circulation channel with an observation section. Therefore, circulation-type aquariums have been put into practical use in some areas where swimming practice and training can be conducted in the observation areas.

FIG. 4 shows an example of a conventional recirculation type aquarium, in which 1 is a vertical recirculation type aquarium body installed via a base 2,
It mainly consists of an upper channel 3, a lower channel 4, and a front diverting channel 5 and a rear diverting channel 6 that connect the upper and lower channels 3 and 4.

An observation window 7 is provided in the upper channel portion of the side wall of the circulating water tank main body 1, and the upper part is opened to form a free water surface, thereby forming an observation section 8.

In addition, the lower waterway 4 has an upstream end position, that is, a rear variable opening waterway 6.
An impeller 9 for generating water flow is disposed at the side end position so that it can be rotated and driven by a drive device 10 installed outside the circulating water tank body.

Furthermore, water guide plates 11 called guide vanes are provided in the front and rear direction changing channels 5 and 6 to change the direction of water flow.

By rotationally driving the impeller 9 by the driving device 10, a water flow is generated, and the generated water flow flows into the lower water channel 4.
is accelerated, the front diverting waterway 5 changes direction, and the upper waterway 3
The water flow is then sent to the rear diversion channel 6 and sucked in again by the impeller 9, thereby circulating the water flow.

[Problems to be Solved by the Invention] However, in such a conventional circulating water tank, two bent portions are formed in the front diversion channel 5 that changes the direction of the water flow sent from the impeller 9. Since short water guide plates 11 are provided at equal intervals in this bent portion, the water flow is biased outward due to centrifugal force. In order to make this deflected water flow look like - in the M1 section 8, conventionally, a pressure chamber 12 having a three-dimensional curved shape is formed at the upstream end of the upper water channel 3, and the pressure chamber 12 is suctioned by a vacuum pump 13. The free water surface within 12 is eliminated.

On the other hand, since the observation part 8 is a flow having a free water surface and is in contact with the atmosphere, there is a pressure discontinuity with respect to the pressure chamber 12. This discontinuity in pressure causes standing waves to be generated in the observation section 8, and standing waves are a fatal drawback for circulating water tanks. Therefore, in order to reduce standing waves, observation section 8'-
A wave-dissipating plate 14 is provided at the end. However, pressure chamber 12
A boundary layer develops due to the nozzle-shaped upper surface and the wave-absorbing plate 14, and the flow velocity at the observation section 8 decreases by nearly 20%.

Therefore, a surface accelerator 15 is provided between the pressure chamber 12 and the wave-dissipating plate 14 to compensate for the decrease in flow velocity.

As described above, in the conventional circulation type aquarium, in order to reduce standing waves in the observation section 8 and ensure uniformity of the flow, it is necessary to provide a complicated shape and various devices.

The present invention was made in view of these circumstances.

[Means for Solving the Problems] The present invention provides a vertical circulation flow from an upper water channel that has a U1 section, a lower water channel that is equipped with a water flow generator, and a front and rear diversion channel that connects the upper and lower water channels. In the circulation type aquarium that constitutes the main body of the type aquarium, the height of the lower water channel is made smaller than the height of the upper water channel, the front diverting channel is formed into a curved shape, and the front diverting channel is provided with a A curved water guide plate with a length extending from the inlet to the outlet of the front diversion waterway is dense on the inside and sparse on the outside.
In addition, the outlet is wider than the population, and the middle part is wider than either the inlet or the outlet.

[Function] The water flowing from the lower water channel to the front diversion channel by the drive of the water flow generating device passes between each water guide plate, prevents separation of the water flow, and is sent into the upper water channel in a -like flow.

[Example] Hereinafter, the present invention will be explained in detail based on the drawings.

1 to 3 show one embodiment of the present invention, and in the figures, parts given the same reference numerals as in FIG. 4 represent the same parts.

For example, if the upper water channel 3 is about 2 m wide and about 1 m deep (height) for swimming, and the lower water channel 4 is about 2 m wide and 1/3 of the width, or about 66 B+na+, then three impellers 9 This allows you to drive more efficiently.

A front curved plate 16 having an arcuate cross section forming the front diversion waterway 5
The second quadrant is formed by the line (y-axis) connecting the center of curvature 04 of the front diversion waterway 5 and the population, and the boundary center line (y-axis) of the upper waterway 3 and the lower waterway 4. be located at A straight line connecting the center of curvature 04 and the y-axis and the intersection (origin) of the y-axes is expressed as y--ax (where x<0).

A water guide plate IL having an arcuate cross section is provided in the curved front diverting waterway 5.
1. LL2, 113 is arranged at the required position.

That is, at the inlet and outlet portions of each water guide plate 1.11, 112.113, the distance between the outer water guide plate and the inner water guide plate is set to be larger than the distance with the inner water guide plate. , 112, 113 center of curvature 01°o2.
o, , are located on the straight line connecting the origin represented by y--ax and 04.

Furthermore, the inlet and outlet portions of each water guide plate Ill, 112, 113 are made horizontal within a required range to improve the linearity of the flow.

Specifically, the vertical circulation type water tank body l has the dimensions shown in Figure 3.
Each water guide plate Ill, 1 is installed inside the side plate of the front diversion waterway section.
Arcs 12 and 113 are marked, and water guide plates 111, 112, and 113 made of metal plates such as stainless steel are fixed by welding or the like.

With the configuration as described above, the impeller 9 installed in the lower water channel 4, which is smaller in height than the upper water channel 3, is connected to the drive device lO.
When the water is rotated by
and flows into channels 51, 52, 53° 54 partitioned by water guide plates 111, 112, 113.

Each flow path 51, 52, 53, 54 has each population al+a2+
a3. Slightly wider than the dimension of A4, y --ax
The parts that intersect the straight line CI + C2, C3.

It widens to the maximum with C4, and then gradually gets sandwiched between each channel 51,
52, 53, 54 exit b1. b2. b3. It is narrowed to the size of b4.

Therefore, the inlet dimension a1. a2. a'3. The water flow entering each channel 51, 52, 53.54 from a, + is in expansion zone I
In step 7, as the flow path expands, the speed decreases very slightly and separation of the water flow occurs, or in the throttle zone 18, as the flow paths 51, 52, 53, and 54 contract, the water flow is compressed and separation is eliminated. A water flow with a uniform head loss flows out from each outlet, and a flow with a uniform velocity is formed in the upper water channel 3.

Note that the circulating water tank of the present invention is not limited to the above-described embodiments, and various changes may be made without departing from the gist of the present invention, such as the number of water guiding plates may be one or more. Of course you can get it.

[Effects of the Invention] As explained above, according to the circulating water tank of the present invention, the front diverting water channel is curved, and a water guide plate having an arcuate cross section is disposed inside the front diverting water channel in a dense manner. The outer part of each water guide plate is sparse, and the outlet of each water guide plate is wider than the inlet, and the middle part is wider than either the inlet or the outlet, so that the flow path partitioned by each water guide plate is gradually Since it is expanded and then contracted again at the outlet, separation of the water flow in the front diversion channel is prevented, and a similar flow velocity distribution can be created in the upper channel. Since the height of the lower water channel can be made lower than that of the upper water channel, the impeller can be downsized, the drive device can also be downsized, and operating costs can be significantly reduced. Furthermore, the entire apparatus can be made more compact by eliminating the need for conventional pressure chambers, vacuum pumps, wave-dissipating plates, surface accelerators, etc., and reducing the overall height of the water tank body.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of the circulating water tank of the present invention;
The figure is a detailed view of the water guiding plate in FIG. 1, FIG. 3 is an explanatory diagram of a specific example of mounting the water guiding plate shown in FIG. 2, and FIG. 4 is a diagram showing an example of a conventional circulating water tank. ■ is the vertical circulation water tank body, 3 is the upper waterway, 4 is the lower waterway, 5 is the front diversion waterway, 11. l11.1.12113 indicates a water guide plate.

Claims (1)

[Claims] 1) In a recirculation type aquarium in which a vertical recirculation type aquarium body is composed of an upper waterway having an observation section, a lower waterway having a water flow generating device, and a front and rear diversion waterway connecting the upper and lower waterways, the lower waterway is smaller than the height of the upper waterway, the front diversion waterway has a curved shape, and within the front diversion waterway, there is a length extending from the inlet to the outlet of the front diversion waterway. A circulating water tank characterized in that the curved water guide plates are arranged so that the inside is dense and the outside is sparse, the outlet is wider than the inlet, and the middle part is wider than both the inlet and the outlet. .