JPS6158609B2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention allows the water intake part to move up and down according to changes in the water level of a water storage means such as a reservoir to take in hot water from the surface layer, or to take water from a layer at any depth. This invention relates to a water intake device whose water intake part can be moved up and down.

Conventional technology In the past, water intake devices were used not only to take hot water from the surface of the water storage means, but also to selectively take water from arbitrary depths for draining the turbid water layer of reservoirs, supplying low-temperature water, etc. Sometimes it is done.

By the way, as a water intake device for the purpose of hot water intake from the surface layer of conventional water storage means, for example, an inclined surface water intake gate equipped with a float (Utility Model No. 50-61620) is used.
) and the so-called overflow type water intake gate that is open at the top and has an intake that spreads out in an arc shape (described in the ``16th Hydropower Seminar Textbook'' by the Japan Hydropower Association), etc. .

Of these, the above-mentioned inclined surface water intake gate
No. 50-61620), the outer diameter of the water intake basin is made larger than the outer diameter of the float to eliminate the entrainment of cold water in the lower layer and prevent a drop in the intake water temperature. The mechanism follows the fluctuations in the water level and allows surface warm water to be taken at all times.

On the other hand, the above-mentioned overflow-type water intake gate (described in the 16th Hydropower Seminar Textbook by the Japan Hydropower Association) has an arc-shaped water intake, so if the water intake is close to a wall, the water intake is circular. It is characterized by better water intake hydraulic characteristics than the

Problems to be Solved by the Invention However, the slanted surface water intake gate (Utility Model Application Publication No. 50-61620) focuses on eliminating the entrainment of cold water during surface water intake, and prevents air bubbles during water intake. No consideration was given to entrainment or the generation of vortices, and since the system was equipped with a float that functioned as a float, it was inconvenient that water could not be taken selectively from any depth in the reservoir.

In addition, since the above-mentioned overflow type water intake gate (described in the 16th Hydropower Seminar Textbook by the Japan Hydropower Association) is open above the intake, it may cause air bubbles to be drawn into the intake water. Not only do they have drawbacks such as the tendency to generate vortices, but they also make it impossible to selectively take water at any desired depth of the reservoir.

Furthermore, in both the inclined surface water intake gate and the overflow type water intake gate, no consideration was given at all to the occurrence of vibrations, noise, etc. during the flow of intake water from the water intake into the water intake pipe.

The present invention was devised in view of the above-mentioned problems and to solve the problems, and its purpose is of course to eliminate the entrainment of cold water during surface water intake. In addition to preventing air bubbles from being drawn into the intake water and the generation of vortices,
To provide a water intake device in which the intake part can be raised and lowered, which prevents the occurrence of vibrations, noise, etc. during the flow of intake water from a water intake into a water intake pipe, and also enables selective intake of water from any depth of a reservoir. be.

Means for Solving the Problems In order to achieve the above objects, the present invention includes a telescopic water intake pipe that can be guided vertically along the embankment wall of a water storage means, and a retractable water intake pipe that is connected to the upper end of the water intake pipe via a joint. The water storage means has a water intake section which has a water intake opening into the water and includes a water intake board that extends in an arc shape toward the center of the water storage means and an upper wall covered above the water intake board, and the joint part is A cross section that is substantially perpendicular to the flow path axis from the water intake part to the expandable water intake pipe has a configuration in which the water intake gradually changes from a fan shape with a substantially equal central angle to a circular shape with a substantially same area as it goes from the top to the bottom. It is.

Here, the water intake plate forming the lower surface of the water intake may be horizontally protruded in the shape of an arc having a larger diameter than the water intake toward the center of the water storage means.

Function The present invention having the above configuration works as follows.

In other words, the water intake board acts to prevent cold water from being entrained in the lower layer, and the upper wall installed above the water intake board prevents air from flowing in from above the water intake, thereby preventing the entrainment of air bubbles and vortices. It acts to prevent such occurrences. In addition, by gradually changing the cross section of the joint from a fan shape with a center angle approximately equal to that of the water intake port to a circular shape with approximately the same area as this, the occurrence of vibrations, noise, etc. during intake water flowing from the water intake port to the water intake pipe can be reduced. Act to prevent. Furthermore, the water intake can be raised and lowered to any depth by expanding and contracting the expandable water intake pipe, and the upper wall covered above the intake board prevents water from flowing in from above the intake, allowing the water intake to be adjusted to any depth. Acts to enable selective water withdrawal from

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, rails 3, 3 are provided in the vertical direction on the wall surface of a bank wall 2 of a water storage means 1 such as a reservoir. Along the rails 3, 3, a first water intake pipe 4, a second water intake pipe 5 that telescopically holds the first water intake pipe 4, a third water intake pipe 6 that similarly holds the second water intake pipe 5, Furthermore, water intake pipes such as the fourth water intake pipe 7 provided in the same manner are sequentially installed to the bottom of the water storage means 1, and each water intake pipe 4 to
The wheels 8, 8 attached to both sides of the upper part of the 7th grade are the rails 3,
3, all the intake pipes form an expandable intake pipe A that can be expanded and contracted vertically along the wall surface of the embankment wall 2.

The upper part of the first water intake pipe 4 becomes a joint part 9 bent toward the center of the water storage means 1, and a water intake part 10 is formed at the upper end thereof.
will be established. The water intake section 10 includes a substantially semicircular horizontal water intake board 13 with a sufficiently large diameter whose chord part is on the bank wall 2 side and whose arc 12 is directed toward the center of the water storage means 1; The wall 14 forms a water intake port 15 that opens in an arc shape toward the center. Inside the water intake 15, a plurality of radial rectifying plates 16 are vertically arranged to firmly connect the water intake plate 13 and the upper wall 14 and prevent the water flowing from the water intake 15 into the first water intake pipe 4 from drifting. It is set up.

In addition, in order to prevent the turbulence of the water taken into the first water intake pipe 4 from the semicircular area by the water intake 15 and the rectifying plate 16 and to feed it to the second and subsequent water intake pipes, the joint 9 is , the cross-section substantially perpendicular to the channel axis 17 gradually changes from a semicircular shape to a circular shape with substantially the same cross-sectional area as shown in FIGS. 3, 4, 5, and 6 from above to below. ing.

One end of the cable 18 is attached to the upper end of the first water intake pipe 4, the other end is connected to the drive device 19, and the drive device 1
9 expands and contracts the water intake pipe A, and in the case of hot water intake, the drive device 19 is controlled by a known water surface detection means (not shown), so that the water intake part 10 is always located in the surface layer of hot water and only supplies hot water. Move it to follow the water intake.

Next, the operation of the present invention will be explained particularly in the case of hot water intake.

When the water level of the water storage means 1 is detected by the water surface detection means, the drive device 19 moves the water intake part 10 up and down along the rail 3 to position the water intake part 10 in the upper warm water of the water storage means 1. In such a case, water intake section 10
Surface warm water flows into the water intake port 15 from the water intake port 15 . Since the water intake port 15 opens in a substantially semicircular shape toward the center of the water storage means on the opposite side of the embankment wall 2, even though the water intake portion 10 is close to the embankment wall 2, water intake is carried out through the embankment wall 2. It is carried out without any influence, and there is no uneven flow in the surface warm water. In this case, making the water intake board 13 larger in diameter than the upper wall 14 is effective in preventing the inconvenience of entraining cold water from the lower layer, and the large diameter water intake board 13 allows surface hot water to approach the surface layer due to fluid friction in the boundary layer. It also has the effect of slowing down the flow rate. The upper wall 14 prevents air from being entrained during water intake, and has the function of not causing any inconvenience particularly to fluid machines such as pumps. Furthermore,
Since the cross-sectional area of the joint 9 is gradually changed as described above, the taken water flows in an orderly manner without turbulence, and no drift occurs near the water intake 15.

It goes without saying that in addition to hot water intake, the present invention can also selectively take water from each layer, such as deep cold water from the water storage means 1.
3 need not have a larger diameter than the upper wall 14.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

Effects of the Invention As is clear from the above description, according to the water intake device according to the present invention in which the water intake part can be raised and lowered, it is possible to prevent cold water in the lower layer from being entrained when taking surface warm water. This has the following remarkable effects.

(b) Since the water intake is covered by the upper wall, there is no risk of air being entrained when surface warm water is taken in. Therefore, it is possible to prevent air bubbles from being drawn into the water intake and the formation of vortices. can.

(b) By gradually changing the cross-sectional shape of the joint with approximately the same area, intake water flows orderly from the intake port to the intake pipe, increasing water intake efficiency and preventing the occurrence of vibrations, noise, etc.

(c) The water intake can be lowered to any depth in the reservoir, and since the water intake is covered with an upper wall and closed off from above, it is possible to selectively take water from each layer, allowing for drainage of turbid water layers and It can also be used to draw low-temperature water.

[Brief explanation of the drawing]

The drawings show an embodiment of the water intake device according to the present invention, in which the water intake part can be raised and lowered, in which FIG. 1 is a plan view of the main part, FIG. Figures 3, 4, 5, and 6 are each of Figure 2.
, FIG. 1...Water storage means, 2...Embankment wall, 9...Joint part,
10...Water intake part, 13...Water intake board, 15...Water intake, 17...Flow path axis, A...Extensible water intake pipe.

Claims (1)

[Scope of Claims] 1. An expandable and retractable water intake pipe that can be guided up and down along the embankment wall of the water storage means, and connected to the upper end of the water intake pipe via a joint, expanding in an arc shape toward the center of the water storage means. It has a water intake part with a water intake opening into the water, which includes a water intake board and an upper wall covered above the water intake board,
The cross section of the joint part, which is substantially perpendicular to the flow path axis from the water intake part to the expandable water intake pipe, gradually changes from a fan shape with a center angle substantially equal to that of the water intake port to a circular shape with a substantially same area as the water intake port. A water intake device in which a water intake part is movable up and down. 2. The water intake device according to claim 1, wherein the water intake plate forming the lower surface of the water intake port horizontally projects toward the center of the water storage means in an arc shape with a larger diameter than the water intake port.