JP3879076B2 - Emergency water tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an emergency water tank that is used as a water transmission / distribution facility connected to a water supply pipe in normal times and used as an emergency water supply source for drinking water or fire-fighting water in an emergency such as an earthquake disaster.
[0002]
[Prior art]
An emergency water tank that is used as a water transmission / distribution facility in normal times and used as an emergency water supply source in an emergency, does not generate stagnant water called dead water in the tank, and the entire amount of water in the tank is replaced in a relatively short time. The function of storing fresh water is required.
[0003]
As an emergency water tank having this function, there are, for example, the invention of Japanese Patent Application No. 7-194086, the invention described in Japanese Patent Application Laid-Open No. 6-199391, and the idea described in Japanese Utility Model Publication No. 60-20687.
[0004]
Although illustration is omitted, the invention of Japanese Patent Application No. 7-194086 relating to the applicant of the present application is that a plurality of swirling blades are assembled radially from the center on the inner surface of the lower end end plate of the vertical cylindrical tank body. The tip of the inflow pipe disposed in the tank is opened toward the center of the assembled end plate, and water from the inflow pipe collides with the end plate and is guided by the swirl vanes while swirling in the tank. The present invention relates to an emergency water tank which is formed so as to be able to always store fresh water without causing dead water in the vertical cylindrical tank by rising.
[0005]
Although not shown in the drawings, the invention described in Japanese Patent Laid-Open No. Hei 6-199391 has an inflow pipe connected to the center of one end of both ends that seal the horizontal cylindrical tank and is connected to the inner periphery of the tank near the one end. A swirling rib and a discharge port are provided along the outlet, and an outflow pipe is connected to the other end at both ends. The present invention relates to an invention of a water storage tank formed so as not to cause dead water in a cylindrical tank.
[0006]
In addition, the device described in Japanese Utility Model Publication No. 60-20687 is not shown in the figure, but the inflow pipe is attached to the center of the upstream end plate of the horizontal cylindrical tank so as to face the inlet of the inflow pipe. The member is provided through a plurality of ribs, and the inflowing water collides with the current-transforming member, the flow is changed along the surface of the current-transforming member, and it is agitated and becomes turbulent flow through the ribs. The present invention relates to an emergency water storage device that collides with an end plate, is further turbulent, flows downstream in a tank, and is formed so as not to cause dead water in a horizontal cylindrical tank.
[0007]
[Problems to be solved by the invention]
By the way, the invention of the above-mentioned conventional emergency water tank according to the present applicant is an invention applied to a cylindrical tank having a large ratio of the trunk diameter to the trunk length and a relatively slow flow velocity in the tank. When the structure of the invention is applied to a horizontal cylindrical tank in which the ratio of the cylinder diameter to the cylinder length is small and the flow velocity in the tank is relatively fast, the water flow resistance of the inflow pipe or the outflow pipe disposed in the tank That is, there was a concern that the energy loss of pressure loss could not be ignored.
[0008]
The invention of the conventional water storage tank provided with the swirl rib also has a concern about the flowing resistance of the large swirl rib provided along the inner periphery of the tank. Furthermore, there is a problem that it is difficult to install a large swivel rib easily.
[0009]
In addition, the above-mentioned conventional emergency water storage device in which a current-transforming member is provided in the inflow pipe via a rib is not provided with a guide for turning in the flow direction of water in the tank. And I was worried about causing a short pass.
[0010]
The present invention has been made in view of the above-described problems of the prior art, and stagnant water called dead water does not occur in a horizontal cylindrical tank, and fresh tap water flowing in reduces flow resistance. Efficiently swiveling while flowing toward the downstream side, flowing out of the tank in a short time and constantly changing the tap water, water supply as a normal water transmission and distribution facility and water supply as an emergency supply source for emergency drinking water, etc. It provides an emergency water tank that can smoothly perform.
[0011]
[Means for Solving the Problems]
In the invention of this emergency water tank, an inflow pipe is connected to one end plate of both ends of the tank body, and both ends of the horizontal cylindrical body are sealed with semi-elliptical end plates, and the other end plate is discharged to the other end plate. In an emergency water tank with a pipe connected, an inflow pipe is connected to an inflow opening provided in the center of the end plate on one side, and the inner surface of the end plate connected to the inflow pipe is radially centered on the inflow port A plurality of swirling blades are placed on the extension line of radiation from the swiveling center point to the starting point of the swirling shape of each swirling blade so that the swirling end point of the adjacent swirling blade is located, and the side that touches the end plate The side opposite to the horizontal cylinder body is formed in a shape orthogonal to the outer periphery of the horizontal cylinder body and assembled by welding, welding, etc., and high-pressure tap water jetted from the inlet at a high speed can be smoothly counter-flowed. diameter formed was deleted spherical or conical anti flow plate Surface, Rutotomoni is opposed by隔接a distance while maintaining a high speed can flow turning counterclockwise to the extent that the influent water is not affected by the layer to be diffused, the plurality of swirl vanes to the outer peripheral edge of the counter-flow plate which it was provided with a fixed end plate center side, the tap water from the inlet pipe coming flow at high speed collides with the anti-flow plate, changing the flow along the reaction flow plate is guided by the swirl vane in the high speed state It is formed so as not to cause dead water in the horizontal cylindrical tank by flowing counterclockwise while swirling along the end plate and swirling toward the downstream side in the horizontal cylindrical body while decreasing the speed.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of an emergency water tank according to the present invention will be described with reference to FIGS.
In the figure, 1 is an emergency water tank, 1B is the tank body, 2 is an inflow pipe for tap water to the emergency water tank 1, and 3 is an outflow pipe for tap water.
[0013]
The tank body 1B of the emergency water tank 1 is formed of a steel plate or the like in a shape in which both ends of the horizontal cylindrical body 1S are sealed with semi-elliptical end plates 1C and 1C, and the cylindrical body 1S is horizontal and embedded in the ground. ing. High-pressure tap water from the water main (not shown) enters the emergency water tank 1 at high speed from the inflow pipe 2 connected to the end plate 1C on one side of the tank main body 1B, and has a larger cross-sectional area than the inflow pipe 2 In the horizontal cylindrical body 1S, flowing toward the other end panel 1C on the downstream side while decreasing the speed, flowing out from the outflow pipe 3 connected to the other end panel 1C, and returning to the water main (not shown) It is normally used as a water distribution facility that delivers water to the destination.
[0014]
In an emergency such as an earthquake disaster, an emergency shut-off valve (not shown) provided between the emergency water tank 1 and the water main (not shown) is closed and the water stored in the tank body 1B is stored. Water is taken out from the fire hydrant 4, the water hydrant 5, etc., and used as a supply source of emergency water for fire extinguishing or drinking.
[0015]
An inflow port 6 opened as shown in the figure is provided in the center of the semi-elliptical end plate 1C on one side of the emergency water tank 1 used in this way, and the tap water inflow pipe 2 is connected to the inflow port 6. To do. On the inner surface of the end plate 1C to which the inflow pipe 2 is connected, a plurality of swirling blades 7 made of a steel plate or the like that are radially oriented around the inflow port 6 and oriented in the same swiveling direction are shown in FIG. 3 and FIG. Assemble by welding or bonding. In this example, six swirl vanes 7 are assembled and formed, but the number is increased or decreased according to the size of the emergency water tank 1.
[0016]
In addition, when the plurality of swirling blades 7 are formed by positioning a swirling blade swirl end point 7E adjacent to the swirling blade 7 on the same radiation as the swirling blade swirling start point 7S as shown in FIG. That is, it is possible to reduce the unnecessary pressure loss of the inflowing water and to turn the inflowing water efficiently. Further, as shown in FIG. 2, the height of the plurality of swirl vanes 7 assembled on the inner surface of the semi-elliptical end plate 1C is perpendicular to the end side, that is, the flow direction can be changed by the countercurrent plate 8 described later. If it is formed in a height shape along the flow of the inflowing water, excess pressure loss can be reduced and the inflowing water can be efficiently swirled by the plurality of swirling blades 7.
[0017]
Further, as shown in the figure, the countercurrent plate 8 formed in a spherical shape or a conical shape with a steel plate or the like is opposed to the inflow port 6 with the concave surface of the countercurrent plate 8 being opposed to the countercurrent plate 8. Are fixed to the center side of the end plate 1 </ b> C of the plurality of swirling blades 7. In addition, when the shape of the countercurrent plate 8 is formed in a non-spherical shape, the inflow water can be smoothly reversed and guided along the countercurrent plate 8, and when formed in a conical shape, Even if the diameter is increased, there is an advantage that a dead water area is unlikely to occur at the convex portion on the back surface of the countercurrent plate 8.
[0018]
The separation distance between the inlet 6 and the counterflow plate 8 is a range in which a potential core portion that is not affected by the layer in which the inflowing water injected from the inlet 6 is diffused is formed, for example, the inlet 6. The water flowing in from the inlet 6 at a high speed collides with the counterflow plate 8 before the speed is greatly reduced, and the inflowing water whose flow has changed along the counterflow plate 8 The swirl is guided by the swirl vanes 7 while maintaining a high speed, and is formed at a distance capable of swirling countercurrent along the end plate.
[0019]
Moreover, the size of the countercurrent plate 8 is formed to have a diameter that allows at least the high-pressure tap water flowing at high speed from the inlet 6 to smoothly counterflow. The size of the counterflow plate 8 shown in the figure is such that the potential core portion of the inflow water injected from the inlet 6 at high speed can be efficiently counterflowed, and dead water is formed on the convex side of the back surface of the counterflow plate 8. The case is formed in a compact and economical size that does not cause the generation of water, but a small through hole (not shown) is provided on the convex side of the back surface of the countercurrent plate 8 so as not to cause dead water. The counter-flow plate 8 is formed in a size that covers the entire downstream edge of the swirl vane 7 or about half of the downstream edge of the swirl vane 7 to increase the swirling performance of the incoming water by the swirl vane 7. You may form in the magnitude | size of the structure to make.
[0020]
As described above, the inflow port 6 connected to the inflow pipe 2 is provided in the end plate 1C on one side, a plurality of swirl blades 7 are assembled, the counterflow plate 8 is fixed, and the center plate 1C on the other side is fixed. In the state where the outflow pipe 3 is connected, the high-pressure tap water injected from the inlet 6 at high speed is collided with the counterflow plate 8, the flow is changed along the counterflow plate 8, and the high speed is maintained. While being guided and swiveled by a plurality of swirling blades 7 fixed to the counterflow plate 8, it swirls and counterflows along the end plate 1C, and the inside of the horizontal cylindrical body 1S of the tank body 1B having a large cross-sectional area is reduced from a high speed to a low speed. However, it flows while turning toward the downstream, and is formed so as to return to the water main (not shown) through the outflow pipe 3.
[0021]
In this way, the high-pressure tap water jetting and flowing from the inlet 6 at a high speed is transformed by the counterflow plate 8 and swirled by the swirl vanes 7 at a high speed, so the counterflow plate 8 has a size. Even if it is small, the inflowing water can be efficiently transformed, and even if the swirl vane 7 is small in size, the inflowing water can be swirled efficiently. Therefore, the pressure loss due to the flow of high-pressure tap water, that is, the energy loss, is caused by the structure of the conventional emergency water tank in which the piping of the inflow pipe is provided in the tank and the conventional water storage tank in which the turning rib is provided along the inner periphery of the tank. Compared with the above structure, etc., it can be made much smaller, and the tank can be manufactured more easily.
[0022]
The emergency water tank 1 having the structure of the present invention has been confirmed by experiments to replace 95% of the water in the tank in a short time at a flow rate of about 1.7 times the storage tank capacity. It has been confirmed that fresh water can always be stored without causing drift and short paths that cause death.
[0023]
【The invention's effect】
As is apparent from the description, the emergency water tank according to the invention of claim 1 is provided with the inflow pipe connected to the center of the one side end plate and the inflow opening opened, and the inflow pipe connected. A plurality of swirl vanes radially on the inner surface of the end plate with the above inlet as an axis, the swirl end point of the adjacent swirl vane is on the extension line of the radiation from the swivel center point to the start point of the swirl shape of each swirl vane The side located opposite to the side that touches the end plate is formed in a shape that is orthogonal to the outer periphery of the horizontal cylindrical body, and is assembled by welding, welding, etc. The concave surface of a spherical or conical counterflow plate formed to a diameter that can smoothly counterflow tap water is swirled and counterflowed at a high speed within a range that is not affected by the layer where the influent water diffuses. The distance to obtain is separated and confronted, and the outer periphery of the countercurrent plate Since the part is provided fixed to the end plate central side of the plurality of swirl vanes smoothly and efficiently variable flow of high pressure tap water come to bubbler at high speed from the inlet at the anti-flow plate, the end plate in a high speed state the assembly swirl vanes flowed counterclockwise while efficiently turns, flow while swirling to the downstream side while slowing down, to return to the water main through the outlet pipe, fast horizontal flow velocity in comparison with the vertical cylindrical tank it is cylindrical tank, with less extra pressure loss of the flow incoming water, it is possible to efficiently pivots causes no drift and short-path to be a dead water factor in the tank, always fresh water Can be stored.
[0024]
Further, the pressure loss due to the flow of high-pressure water influent, i.e. energy loss as compared with the structure or the like of the conventional emergency water tank provided with a pipe inlet pipe into the tank, it is possible small Kusuru to each stage, the Operation, for example, booster pump operation etc. can be done economically, and its tank can be manufactured more easily , so it is easy to spread and more suitable for normal water supply and distribution facilities and emergency emergency water supply sources Can be provided as an emergency water tank.
[0025]
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional explanatory view showing a part of an embodiment of an emergency water tank according to the present invention in a simplified manner.
FIG. 2 is an explanatory view showing an enlarged main part of FIG. 1;
FIG. 3 is a cross-sectional explanatory view taken along line AA in FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Emergency water tank 1B Tank main body 1S Horizontal cylindrical body 1C End plate 2 Inflow pipe 3 Outflow pipe 4 Fire hydrant 5 Water faucet 6 Inlet 7 Swirling blade 7S Turning start point 7E Turning end point 8 Counterflow plate

Claims (1)

The inflow pipe (2) is connected to the end plate (1C) on one side of the tank body (1B) in which both ends of the horizontal cylindrical body (1S) are sealed with semi-elliptical end plates (1C) and (1C) In the emergency water tank (1) in which the outflow pipe (3) is connected to the end plate (1C) on the side, the inflow pipe (2) is connected to the center of the end plate (1C) on the one side, and the inflow port (6 ) is provided by perforated in, the inlet pipe (2) connecting the end plate (plurality of swirl vanes (7 the inlet (6) radially axis on the inner surface of 1C)), each swirl vane ( 7) Place the swirl end point (7E) of the adjacent swirl vane (7) on the extension line of radiation from the swivel center point to the start point (7S) of the swirl shape, and place it on the end plate (1C) contact the side and the side in the opposite position, when assembled in forming the shape perpendicular to the outer periphery of the horizontal cylindrical barrel welding, welding, or the like DOO The said inlet (6) from the form to the size of the diameter can flow smoothly high-pressure tap water jets entering the anti-fast was deleted spherical or conical counter-flow plate concave (8), the inflow water While maintaining a high speed within a range not affected by the diffusing layer, the distance that can be swirled and counterflowed is opposed to each other, and the outer peripheral edge of the reflow plate (8) is made to face the swirl blades (7). emergency water tank, characterized by comprising fixed end plate (1C) center side.

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