JP3190823B2 - Emergency water tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency water storage tank installed in the middle of a water pipe, and more particularly to a water storage tank that can always keep tap water fresh in a water storage tank and store water in a disaster such as a large earthquake. The present invention relates to an emergency water storage tank in which tap water in the tank can be used as drinking water.

[0002]

2. Description of the Related Art As an example of this type of conventional water storage tank, there is a water storage tank described in Japanese Patent Application Laid-Open No. 57-133881 shown in FIG. In this water storage tank, a T-shaped pipe 52 for converting the direction of water Q into a circumferential direction is provided at the end of an inlet conduit 51 on one end side of a tank 53, and the water Q
A perforated plate 54 for equalizing the flow of water in the longitudinal direction of the tank 53 is provided in the vicinity of the inflow of the tank 53, while a taper pipe 55 extending in the water flow direction is provided in the vicinity of the outflow of water at the other end of the tank 53, The outlet pipe 56 is connected to the tapered pipe 55.

In this water storage tank, a T-shaped pipe 5
5B, the inflowing water flows around the tank to form a jet as shown by the arrow in FIG. 5B, and mixes with the surrounding water, and is rectified by the perforated plate 54 to uniformly flow out.
1, there is no danger of a so-called stagnant water basin and the taper pipe 55
Since the flow is also generated at the other end corner, there is no possibility that a stagnation area is generated even near the outlet conduit 56.

As another example, Japanese Utility Model Application Publication No.
-64693.
This water storage tank is configured such that both ends of a tank 63 are conical 63a, 63
b, and an inlet pipe 61 and an outlet pipe 66 are provided at its ends.

[0005] In this water storage tank, since the inlet side has a conical shape 63a, the inflow water Q diffuses and spreads over the entire area of the tank 63, and the outlet side has a conical shape 6a.
3b, the flow gradually converges and flows out, a flow occurs in the entire area of the tank 63, and no stagnation area is generated.

[0006]

However, in the water storage tank shown in FIG. 5, the water Q is guided by the divergent tapered pipe 55, and after the flow velocity is increased, the water Q flows into the tapered pipe 55 by suddenly reversing. Since the resistance increases and the pressure loss increases, and the perforated plate 54 partitions the inside of the tank 53, it is difficult to inspect the inner coating film and the like. There is a problem that the production cost becomes high.

Further, in the water storage tank shown in FIG. 6, the inflow water Q does not diffuse smoothly along the conical surface from the beginning of the inflow, and as shown by the arrow in FIG. In many cases, the flow stays without smooth flow. Conical 6
If the length of the tank 3a is increased, the tank 63 can be eliminated.
Becomes longer.

An object of the present invention is to eliminate the stagnation area at low cost without causing a large pressure loss.

[0009]

In order to solve the above problems SUMMARY OF THE INVENTION This invention is in the shape of closed end faces of the cylindrical body, provided in the middle of the water pipe, the water supply to one end of the tubular body
In the above-mentioned well-known emergency water storage tank in which the inflow pipe from the pipe and the outflow pipe to the water pipe are connected to the other end, and water flows from one end of the tubular main body to the other end, the inflow pipe is cylindrical. reached approximately on the axis of the body, the opening is branched into those faces which faces the one end surface and other end surface of the cylindrical body, one end side wall inner surface of the tubular body from the opening of the one end face Water is spouted toward the other end side wall of the cylindrical body from the opening on the other end side.
The structure is such that water is discharged toward the inner surface of the (1).

As described above, when a part of the inflowing water is jetted to one end face of the tank opposite to the flowing direction of the water in the water storage tank, the jetted water hits one end face and diffuses around the same, and the surrounding water is diffused. After mixing with, it reaches the inner surface of the cylindrical body,
It goes to the other end side of the water tank, that is, the outflow pipe. Due to the diffusion and mixing of the jet water, the stagnation at one end of the water storage tank is eliminated, while the water discharged from the other end side opening spreads around, and the water that has reached the inner surface of the cylindrical main body from the jet water. Mix and direct to drain.

At this time, it is preferable that the opening area on the other end side is larger than the opening area on the one end side, for example, 2 to 30 times. With this configuration, the generation of a stagnation area near the one end surface due to the amount of the jetted water to the one end surface being too small, or the generation of a stagnant area around the cylindrical body at the other end side due to the amount of the jetted water being too large. The generation of a stagnation area can be prevented.

In order to discharge water from the opening on the other end surface side to the inner surface of the cylindrical main body, the opening is formed in a trumpet shape whose diameter increases toward the other end surface of the cylindrical main body. It is assumed to be provided (claim 4).

Preferably, the opening on one end face side is a nozzle whose diameter decreases toward one end face of the cylindrical body. By doing so, the momentum of the jet water increases, and the diffusion and mixing actions are promoted.

Further, it is preferable that the inner surfaces of both end walls of the cylindrical main body have a curved surface which bulges outward with the cylindrical axis as a center axis, and the outlet of the outlet pipe is formed at the center of the inner surface of the other end wall. (Claim 6).

As described above, when the inner surface of the one end wall of the cylindrical body is a curved surface, the water colliding with the inner surface smoothly changes the flow direction along the curved surface, and also has the diffusion and mixing effects. Will be more smooth. If the inner surface of the other end wall is a curved surface, the outflow water is converged along the curved surface, and flows out smoothly from the outflow pipe at the center of the converging.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a preferred embodiment of the present invention, and FIG. 2 is a partially enlarged view of FIG.

In the drawing, reference numeral 1 denotes a cylindrical body whose both end surfaces are closed by walls 2 and 3, 4 denotes an inflow pipe provided at one end of the cylindrical body 1, and 5 denotes the other end at the center of the end wall 3. Outflow pipe provided in

The inflow pipe 4 penetrates the cylindrical main body 1 from above, and the T-shaped portion 6 at the end thereof is located substantially on the axis of the cylindrical main body 1. Reference numeral 7 denotes an enlarged-diameter portion having a perforated plate 8 at the tip, which is connected to the T-shaped portion 6. Reference numeral 9 denotes a reduced diameter portion having a nozzle hole 10 at the tip, which is connected to the T-shaped portion 6. Reference numeral 11 denotes a plurality of through holes arranged in the perforated plate. The through hole 11 faces the outflow pipe 5 side, and the nozzle hole 1
0 points to the opposite side. Numeral 12 denotes an inspection hole. The opening area of the perforated plate 8 is set to be 2 to 30 times the opening area of the nozzle hole 10.

The operation of this embodiment is as described above. To explain the operation, the inflow pipe 4 is connected to a water pipe (not shown), and tap water Q flows into the cylindrical main body 1 from the inflow pipe 4. I do. This tap water Q is branched by a T-shaped portion 6 located substantially on the axis of the cylindrical main body 1, and a large amount of tap water Q flows from a plurality of through holes 11 arranged in the perforated plate 8 to the outflow pipe 5 side. The tap water Q is discharged toward the one end wall 2 from the nozzle hole 10.

The tap water Q discharged from the through hole 11 of the perforated plate 8 toward the outflow pipe 5 has a reduced speed, and gradually spreads from the substantially axis of the cylindrical main body 1 toward the side wall 1a. An attempt is made to proceed substantially at the center toward the outflow pipe 5. Further, the tap water Q spouted from the nozzle hole 10 toward the one end wall 2 collides with the end wall 2 and then diffuses radially.
While flowing toward the outflow pipe 5 along the side wall part 1a, it also tends to gradually move toward the substantially axial center of the tubular main body 1.

At this time, the tap water Q discharged from the through hole 11 of the perforated plate 8 flows from the central portion (near the axis) of the tubular main body 1 while gradually spreading to the side wall portion 1a. The removed part, that is, the rear side (one end wall 2 side) of the inflow pipe 4 and the side wall part 1a slightly on the front side tend to be a so-called stagnation area. Further, since the flow velocity is relatively large in the central portion and the flow velocity is small in the side wall portion 1a, a so-called stagnation region is easily generated in the side wall portion 1a.

However, the tap water Q spouted from the nozzle hole 10 collides with the one end wall 2 and then diffuses radially and proceeds along the side wall 1a to the outflow pipe 5 side. The stagnation area does not occur in the side wall 1a slightly on the front side or the like.

Further, as described above, the tap water Q flowing in the central portion (near the axis) tends to spread to the side wall 1a, and the tap water Q flowing in the side wall 1a tends to the central portion. There is no danger of stagnation. As a result, the tap water Q in the tubular main body 1 can always be kept fresh. Tap water Q discharged from the outflow pipe 5
Is returned to the water pipe. The flow of the tap water Q is indicated by arrows in FIG.

The water pipe and the emergency water storage tank are connected via a gate valve, an emergency shutoff valve, and the like. When a disaster such as a large earthquake occurs, the emergency shutoff valve causes the water pipe and the emergency water storage tank to be connected. The tank is divided, and the water in the water tank is pumped up by a water supply system such as a pump and used as drinking water.

FIGS. 3A to 3D show another embodiment, which shows a modified example of the outflow pipe 4. FIG. FIG. 3 (A)
2, one end of the T-shaped portion 6 at the end of the inflow pipe 4 is formed as a plate-shaped water stopping member 20 and the nozzle hole 1 is provided at the center thereof.
0a is provided.

FIG. 3B shows a case where the end of the inflow pipe 4 is a curved pipe part 21 of 90 °, and the curved pipe part 21 is provided with a nozzle hole 10b.

FIG. 3C shows an inflow pipe 4 penetrating one end wall 2, and a straight pipe portion 22 having an inner diameter slightly larger than the outer diameter of the inflow pipe 4 at the tip of the inflow pipe 4, and a perforated plate 8. A cap 24 having an enlarged diameter portion 23 provided with a screw is fixed in a loosely fitted state, and a nozzle hole 10 c is provided between the inflow pipe 4 and the straight pipe section 22.
Is formed.

FIG. 3D shows a case where a small-diameter curved pipe 25 is provided in the inflow pipe 4 penetrating the one end wall 2.
The opening 5 becomes the nozzle hole 10d.

In any case, most of the tap water Q in the inflow pipe 4 is discharged toward the outflow pipe 5, and part of the tap water Q is partially discharged from the one end wall 2.
There is no change in the structure that is ejected to the side.
Then, as in the case described above, the tap water Q discharged toward the outflow pipe 5 mainly gradually covers the substantially central portion of the side wall portion 1.
The tap water Q which flows toward the outflow pipe 5 while spreading to a, and is jetted from the nozzle holes 10a toward the one end wall 2 collides with the one end wall 2 and then flows out along the side wall portion 1a. It flows towards the tube 5. For this reason, there is no possibility that a stagnation area is generated, and the tap water Q in the tubular main body 1 can always be kept fresh.

[0030]

EXAMPLES In order to confirm the effect of the present invention, the flow rate of a water tank was 3 m, the length was 15 m, the capacity was 125 m ³ , and the inner diameter of a water pipe and an inflow pipe was 200 mm.
Assuming 0,1450,3000 m ³ / day, a 1/10 scale model was made, and a number of experiments were conducted to investigate the flow state and the stagnation state.

The flow condition was determined by filling the water tank with fresh water and supplying water colored with a fluorescent dye. In addition, the state of the stagnation is as follows: while filling the water tank with colored water and supplying fresh water, water is collected at predetermined time intervals from sampling points P1 to P9 in the water tank shown in FIG. The dye concentration was analyzed using a fluorimeter. From this result, the cumulative flow rate and the replacement magnification (the cumulative amount divided by the volume of the water tank) when the dye concentration becomes 1% or less of the initial value are obtained, and the freshness of the tap water Q in the water tank is determined. did.

As an example, the inflow pipe 4 having the shape shown in FIG.
Table 1 shows the results of the experiment using. In this experiment,
By changing the diameter of the nozzle hole 10, the ratio (opening ratio: T1 / T2) of the opening area T1 on the other end wall side to the opening area T2 on the one end wall side is set to 3
It is changing as the street. In Example 3, the reduced diameter portion 9 was eliminated, and the diameter of the nozzle hole 10 was the same as that of the T-shaped portion 6.

[0033]

[Table 1]

In this experiment, the dye concentration was initially 1%.
In the first embodiment, the accumulated flow rate until becomes approximately 300 m ³ ,
In Example 2, it was confirmed that the flow rate was about 270 m ³ and was not significantly affected by the flow rate. On the other hand, in Example 3, the flow rate was 1
When the flow rate is as high as 450,3000 m ³ / day, the accumulated flow is about 2
40 m ^{3, which} is a better value than Examples 1 and 2, but when the flow rate is as small as 100 m ³ / day, the accumulated flow rate is about 420
m ³ , which was worse than those of Examples 1 and 2.

In all of Examples 1 to 3, it was confirmed that the dye concentration was 1% of the initial value, and that no so-called stagnation region was generated. Considering the usage condition where the flow rate is small,
The results are better in the order of Examples 2, 1, and 3.

In the case of the first and second embodiments, most of the tap water Q flows from the perforated plate 8 through the substantially central portion of the tubular main body 1 while gradually spreading to the side wall 1a. 5, the remaining tap water Q was ejected from the nozzle hole 10, hit the one end wall 2, was diffused radially, and flowed along the side wall 1a. In the case of the third embodiment, since the amount of tap water Q spouted from the nozzle hole 10 is large, the tap water Q spouted from here and the tap water Q discharged toward the outflow pipe 5 are integrated. And tended to flow to the outflow pipe 5 side. Because of this, after the tap water Q ejected from the nozzle hole 10 hits the one end wall 2 and flows along the side wall 1a, it is possible to prevent the generation of a stagnation area in the side wall 1a. The ratio between the tap water Q spouted from the hole 10 and the tap water Q discharged toward the outflow pipe 5 is important. Therefore, the aperture ratio is 2
It is preferably 30 times, and more preferably 5 times or more.

[0037]

The present invention has been a problem in the prior art because the present invention is configured as described above, and the inflow water is branched in two opposite directions so as to flow evenly over the entire storage tank. There is no so-called stagnation area on the side wall of the tubular main body 1, and the tap water in the storage tank can always be kept fresh.

Further, since there is no obstacle in the cylindrical main body, the maintenance is easy, and the structure such as the opening of the inflow pipe is simple, so that the production cost is low.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an embodiment of the present invention.

FIG. 2 shows an opening of an inflow pipe of the embodiment, (A) is a cut front view, and (B) is a right side view.

FIG. 3 is a cut-away front view showing each example of an opening of an inflow pipe.

FIG. 4 is an operation explanatory view of the embodiment.

FIG. 5 is a schematic view of a conventional example, (A) is a front view,
(B) is a side view

FIG. 6 is a schematic front view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical main body 2 Cylindrical main body one end wall 3 Cylindrical main body other end wall 4 Inflow pipe 5 Outflow pipe 6 T-shaped part 7 Large diameter part 8 Perforated plate 9 Reduced diameter part 10, 10a, 10b, 10c, 10d Nozzle hole 11 Through hole 21 Curved pipe part 22 Straight pipe part 23 Large diameter part 24 Cap 25 Curved pipe Q Tap water

Claims (6)

(57) [Claims] 1. A water pipe having a shape in which both end surfaces of a cylindrical body are closed and provided in the middle of a water pipe, and one end of the cylindrical body being provided with the water pipe.
In an emergency water storage tank that connects an inflow pipe from the other end to an outflow pipe to a water pipe to allow water to flow from one end to the other end of the tubular body, the inflow pipe is substantially a shaft inside the tubular body. It reaches the heart, and its opening is branched into one that faces one end of the tubular body and one that faces the other end, and water is spouted from the opening on one end side toward the inner surface of one side wall of the cylindrical body. An emergency water storage tank characterized in that water is discharged from the other end surface side opening toward the inner surface of the cylindrical body in the direction of the other end wall . 2. The emergency water storage tank according to claim 1, wherein the opening area on the other end side of the inflow pipe is larger than the opening area on the one end side. 3. The emergency water storage tank according to claim 2, wherein the opening area on the other end side is set to be 2 to 30 times the opening area on the one end side. 4. The opening on the other end surface side has a trumpet shape whose diameter increases toward the other end surface of the cylindrical main body, and a perforated plate is provided in the opening to discharge water to the inner surface of the cylindrical main body. The emergency water storage tank according to any one of claims 1 to 3, wherein: 5. The opening on the one end surface side is a nozzle whose diameter is reduced toward one end surface of the cylindrical main body, and water is jetted from the nozzle to the inner surface of one end side wall of the cylindrical main body. The emergency water tank according to any one of claims 1 to 4, characterized in that: 6. An inner surface of both end walls of the cylindrical main body is formed into a curved surface which bulges outward with the cylindrical axis as a center axis, and an outlet of the outlet pipe is formed at the center of the inner surface of the other end wall. The emergency water tank according to any one of claims 1 to 5, characterized in that: