JP2012057436A - Water storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water storage tank capable of effectively replacing water in the storage tank by optimizing water flow inside the storage tank to prevent stagnation of supplied water.SOLUTION: A water storage tank of the present invention comprises: a tank main body 2 having a cylinder section 3 with an approximate shape of a cylinder, and a first panel board section 4 as well as a second panel section 5 to seal both ends of the cylinder section; and an inflow pipe 6 as well as an outflow pipe 7 which are attached to the tank main body 2. An end section of the inflow pipe 6 inside a tank is arranged opposite to the first panel board section 4 and the end section of the outflow pipe 7 inside the tank is arranged opposite to the second panel board section 5. The end section 8 of the inflow pipe 6 inside the tank is provided with a distributor 10 as flow regulating means to radially discharge supplied water toward an internal surface of the first panel board section 4 of the tank main body 2. A conical water collection section 9 is provided at the end section of the outflow pipe 7 inside the tank.

Description

  The present invention relates to a water tank. In particular, the present invention relates to a water storage tank capable of maintaining the quality of water stored therein.

  In recent years, water tanks with earthquake resistance have been installed in various places. By installing a water tank having earthquake resistance, for example, even when a water pipe is damaged due to a disaster such as an earthquake and the water is shut off for a long time, drinking water can be supplied to the victim. In addition, it is possible to secure a water source for initial fire extinguishing in the event of a fire due to a secondary disaster such as an earthquake.

  In order to use the water in the water reservoir as drinking water in the event of a disaster, it is necessary to always maintain the water stored in the water reservoir in a water quality suitable for drinking. Therefore, there is a technology that places the water tank on or near the water main path, connects the water main and the water tank with two pipes, an inflow pipe and an outflow pipe, and constantly supplies tap water to the water tank. Are known. The tap water supplied from the water main to the water storage tank via the inflow pipe passes through the water storage tank, and finally flows out from the outflow pipe to the water main. In such a water tank, since fresh tap water always passes through the inside of the water tank, it is considered that it is easy to maintain the water quality without performing any special management work.

  In order to maintain the water quality of the water tank connected to the water main, it is particularly important to prevent the supplied tap water from staying. If there is even a part of the water storage area where water stays, the concentration of chlorine in the water decreases in that area, so that germs can propagate and the water quality deteriorates, making it unsuitable for drinking. Therefore, various attempts have been made to optimize the water flow in the water tank to prevent stagnation and to ensure that all water in the water tank is replaced with new tap water. Patent Document 1 discloses a technique for forming a tip portion of an outflow pipe in a conical shape. By forming the tip of the outflow pipe in a conical shape, an effect of improving the flow downstream of the water storage tank is expected.

JP 2000-129735 A

  Water tanks for supplying drinking water at the time of a disaster need to always store sanitary and drinking water. In particular, in an always-replaceable storage tank that is connected to the water main and is constantly supplied and discharged, the supplied tap water is surely replaced with new tap water without staying inside the storage tank. Therefore, technology to optimize the water flow in the water tank is required.

  The present invention has been made in view of the above circumstances, and prevents a stagnation of water supplied by optimizing the flow of internal water, and a water tank in which water in the water tank is efficiently replaced. It is intended to provide.

  The present invention relates to a water tank. The water storage tank of the present invention includes a tank main body having a substantially cylindrical tubular portion and first and second end plate portions that seal both ends of the tubular portion, an inflow pipe and an outflow attached to the tank main body. A tube. The water storage tank of the present invention is arranged such that the tank inner end of the inflow pipe faces the first end plate, and the tank inner end of the outflow pipe faces the second end plate. Yes. The tank inner end of the inflow pipe is provided with rectifying means for discharging water introduced into the tank main body through the inflow pipe in a radial direction in the tank main body. A conical water collecting portion is provided at the inner end portion.

  The rectifying means provided in the inflow pipe of the water storage tank of the present invention is disposed in the vicinity of the first end plate portion of the cylindrical tank body, and the water discharged from the rectifying means is the peripheral portion of the end plate portion of the tank. To reach. Since the peripheral edge portion of the end plate portion is a curved surface, water moves smoothly along the curved surface and reaches the cylindrical portion. Further, the water flows in parallel to the cylindrical portion and flows to the outflow pipe side, and finally flows out efficiently from the water collection portion of the outflow pipe.

  Preferably, the rectifying means arranged at the inner end of the tank of the water storage tank of the present invention is constituted by a cylindrical box type distributor. The distributor has a cylindrical peripheral wall portion that surrounds the inflow pipe and has a plurality of openings. The tap water that has flowed into the distributor from the inner end of the tank of the inflow pipe is directed in the radial direction of the tank body by a plurality of openings formed in the peripheral wall portion, and forms a preferable radial flow.

  More preferably, the distributor of the present invention partitions the peripheral wall portion, the annular plate portion connecting the peripheral wall portion and the inflow pipe, the disc portion closing the end portion of the peripheral wall portion, and the inside of the peripheral wall portion at equal intervals. A plurality of support plates.

  In addition, the distributor of the present invention includes a peripheral wall portion, a cylindrical inner wall portion that is formed concentrically with the peripheral wall portion, in which a plurality of openings are formed, and the peripheral wall portion and the inner wall portion. It can comprise so that the annular plate part which connects a pipe | tube, and the disc part connected so that the terminal part of a surrounding wall part and an inner wall part may be closed. By further providing the inner wall portion inside the peripheral wall portion, it becomes possible to flow out the tap water supplied from the inflow pipe around the distributor in a further controlled state.

  The first and second end plate portions of the water storage tank of the present invention each have a curved inner surface. The rectifying means and the conical water collecting portion of the water storage tank of the present invention are arranged on the central axis of the cylindrical portion of the tank body connecting the center of the curved inner surface of the first end plate portion and the center of the curved inner surface of the second end plate portion. It is preferable to arrange | position so that it may be located in. Furthermore, it is preferable that the opening of the distributor of the present invention is opposed to the curved inner surface of the first end plate portion.

  The water storage tank of the present invention is a constantly-replaceable water storage system installed in the middle of the water main path by connecting the tank outer end of the inflow pipe and the tank outer end of the outflow pipe to the water main. A tank is preferred.

  The water storage tank of the present invention is arranged such that the tank inner end of the inflow pipe faces the first end plate of the tank main body, and water is supplied to the tank inner end of the inflow pipe in the tank main body. By providing rectifying means for discharging radially in the radial direction, the flow in the tank body of the supplied water is optimized. As a result, the supplied water smoothly moves and passes through the inside of the tank main body without staying in the tank main body, and efficiently flows out from the outflow pipe.

  In the water storage tank of the present invention, since the water collecting part is provided in the outflow pipe, the water flow around the second end plate part becomes smoother, and the supplied water passes through the tank body more quickly. Leaked.

  The distributor, which is a rectifying means provided in the inflow pipe of the water storage tank of the present invention, can direct the water supplied to the tank body in a preferred direction. It is possible to efficiently move and pass through the inside of the tank body without generating a jet flow or a swirl flow due to a collision.

FIG. 1 is a longitudinal sectional view of an earthquake-resistant water tank 1 according to a first embodiment of the present invention. 2A is a top view of the distributor (rectifying means) 10 connected to the tank inner end 8 of the inflow pipe 6, and FIG. 2B is connected to the tank inner end 8 of the inflow pipe 6. It is a side view of the distributor 10 used. FIG. 3 is a longitudinal sectional view of the distributor 20 according to the second embodiment of the present invention. FIG. 4 is a diagram schematically showing the direction of flow in a steady state inside the tank body 2 based on the result of fluid analysis for the water storage tank 1 of the first embodiment. FIG. 5 is a diagram illustrating a result of the diffusion analysis of the tap water W in the tank body 2 of the water storage tank 1 according to the first embodiment. FIG. 6 is a diagram schematically showing the direction of flow in a steady state inside the tank body 2 based on the result of fluid analysis for the water storage tank of the comparative example. FIG. 7 is a diagram showing the degree of water replacement in the water tank 1 of Example 1 and the water tank of the comparative example.

  Hereinafter, as an embodiment for carrying out the present invention, an embodiment in which the water storage tank of the present invention is applied to a ground-installed drinking water and earthquake-resistant water storage tank formed of stainless steel will be described. In the following embodiments, the water storage tank of the present invention is connected on a water main route, and can be always supplied with tap water.

  Hereinafter, the configuration and operation of the water storage tank of the present embodiment will be described in detail with reference to the drawings. The longitudinal cross-sectional view of the water storage tank 1 of a present Example is shown in FIG. The water tank 1 of the present embodiment includes a tank body 2, an inflow pipe 6, and an outflow pipe 7. The water tank 1 is installed and fixed on the ground by two legs 31. In addition to this, the water storage tank 1 is provided with a water supply pipe 35 provided at the lower portion of the tank main body 2 in order to supply water inside the tank main body 2 to the outside. The water storage tank 1 installed on the ground does not need to dig a hole for embedding and is easier to construct such as piping than a conventional earthquake-resistant water tank buried underground. It is possible to install them at a low cost. Moreover, since the installation location is easily recognized by local residents, it is possible to increase the chances of being used as drinking water at the time of a disaster and water for initial fire fighting.

  The tank body 2 in the present embodiment includes a substantially cylindrical tubular portion 3, a first end plate portion 4, and a second end plate portion 5. The end plate portions 4 and 5 are semi-elliptical end plates (curved end plates having a semi-elliptical cross section) that are molded so that the inner diameter of the flange portion matches the inner diameter of the cylindrical portion 3. The tubular portion 3 and the end plate portions 4 and 5 are all made of stainless steel, and are integrated by welding to constitute a tank body 2 having high water tightness.

  The tank body 2 of this embodiment formed by welding stainless steel has sufficient strength and is excellent in earthquake resistance. In addition, since the cylindrical portion 3 and the end plate portions 4 and 5 of the tank body 2 are both formed of stainless steel without a coating film, the tank body 2 as a whole is hardly deteriorated over time, and the earthquake resistance is certified. It is possible to maintain a sufficient strength for a long time. Further, the tank body 2 does not require maintenance work such as painting.

  The tank body 2 is provided with an inflow pipe 6 and an outflow pipe 7 made of stainless steel. The inflow pipe 6 and the outflow pipe 7 are fixed to the cylindrical portion 3 by welding in a state of passing through the upper portion of the cylindrical portion 3. A repair valve 32 is provided at the end of the tank outer end portion 16 of the inflow pipe 6 projecting outside the tank body 2. The repair valve 32 is connected to the quick air valve 42. The tank outer end 16 of the inflow pipe 6 is connected to the water main 40 before the repair valve 32, and tap water W is always supplied from the water main to the inflow pipe 6. If the water main 40 is damaged at the time of a disaster such as an earthquake, there is a possibility that the tap water W inside the tank body 2 will gradually flow backward due to the siphon phenomenon and flow out. In order to cope with such outflow of tap water W, air is supplied to the inside of the water main pipe 40 via the tank outer end 16 of the inflow pipe 6, and the outflow of water stored in the tank body 2 is discharged. Functions to prevent.

  On the other hand, a repair valve 32 connected to the quick air valve 42 is also provided at the tank outer end 17 of the outflow pipe 7 protruding outside the tank body 2. The tank outer end 17 of the outflow pipe 7 is connected to the water main pipe 41 before the repair valve 32. The water main 41 connected to the outflow pipe 7 is located downstream of the water main 40 connected to the inflow pipe 6, and the tap water W supplied from the inflow pipe 6 passes through the tank body 2. Finally, it flows out from the outflow pipe 7 to the water main pipe 41. The quick air valve 42 connected to the outflow pipe 7 via the repair valve 32 is also connected to the water supply via the tank outer end 17 of the outflow pipe 7 when the water main pipe 41 is damaged during a disaster such as an earthquake. It functions to supply air into the main pipe 41 and prevent the water stored in the tank body 2 from flowing out.

  A conical water collecting portion 9 is disposed at the inner end of the tank, which is the end of the outflow pipe 7 disposed within the tank body 2. The water collecting portion 9 of the present embodiment is a conical (trumpet-shaped) member made of stainless steel so that its diameter gradually increases as it approaches the peripheral portion, and the tank inner end of the outflow pipe 7 It is fixed by welding. The water collecting portion 9 has a central axis that coincides with the central axis C of the cylindrical portion 3 that connects the center of the curved inner surface of the first end plate portion 4 and the center of the curved inner surface of the second end plate portion. The opening provided in the terminal part of the water collection part 9 and the 2nd end plate part 5 are arrange | positioned so that it may oppose. The water collecting part 9 of the present embodiment is arranged so that the distance from the peripheral edge of the water collecting part 9 to the inner surface of the second end plate part 5 is uniform, and the tap water W passes through this space. Can do.

  A cylindrical box-shaped distributor 10 serving as a rectifying means is welded to the inner end 8 of the tank, which is the end of the inflow pipe 6 disposed inside the tank body 2, so as to face the first end plate 4. Being connected. FIG. 2A shows a top view of the distributor (rectifying means) 10, and FIG. 2B shows a side view of the distributor 10 connected to the tank inner end 8 of the inflow pipe 6. The distributor 10 includes a cylindrical peripheral wall portion 11 disposed so as to surround the tank inner end portion 8 of the inflow pipe 6, and an annular plate portion that connects between the peripheral wall portion 11 and the tank inner end portion 8 of the inflow pipe 6. 12, a disc portion 13 that closes the end portion of the peripheral wall portion 11, and one or more support plates 15 that partition the inside of the peripheral wall portion 11 at equal intervals. Distributor 10 is made of stainless steel, so that it does not rust even when used in water for a long period of time, and has excellent durability. The peripheral wall portion 11 of the distributor 10 in this embodiment is formed by processing a punching metal having a plurality of circular openings 14 formed at uniform intervals into a cylindrical shape.

  In the distributor 10 of this embodiment, the cylindrical axis 3 of the cylindrical peripheral wall portion 11 connects the center of the curved inner surface of the first end plate portion 4 and the center of the curved inner surface of the second end plate portion. It is connected to the inflow pipe 6 so as to coincide with the central axis C, and the opening 14 provided in the peripheral wall portion 11 is arranged at a position facing the inner surface of the first end plate portion 4. That is, the distributor 10 in the present embodiment is disposed inside the tank body 2 so that the distance from the peripheral edge of the disc portion 13 to the inner surface of the first end plate portion 4 is uniform.

  In the following, the flow of water inside the tank body 2 controlled by the distributor 10 connected to the inflow pipe 6 and the water collecting part 9 connected to the outflow pipe 7 will be described. The tap water W supplied from the water main 40 reaches the distributor 10 via the inflow pipe 6. The supplied tap water W is uniformly supplied to the entire inner side of the peripheral wall portion 11 by the support plate 15 inside the distributor 10. The tap water W is directed by the opening 14 provided in the peripheral wall portion 11 and is discharged radially at a uniform flow rate in the radial direction of the peripheral wall portion 11. The discharged tap water W collides with the first end plate portion 4 of the tank body 2. Since the first end plate portion 4 has a semi-ellipsoidal shape and has a curved surface as a whole, the tap water W that has collided with the first end plate portion 4 moves in a smoothly changing direction along the curved surface. .

  Most of the tap water W discharged from the distributor 10 and colliding with the first end plate part 4 of the tank body 2 moves into the cylindrical part 3 and is parallel to the cylindrical part 3 as indicated by an arrow 51. The flow moves to the second end plate portion 5 side. Then, the tap water W that has moved inside the cylindrical portion 3 enters the second end plate portion 5. The flow of the tap water W that has moved around the center line (C) of the tubular portion 3 changes the direction of the flow so as to wrap around the conical back surface of the water collecting portion 9 as shown by an arrow 53, Finally, it flows from the water collecting section 9 into the outflow pipe 7. The flow of the tap water W moved along the inner wall of the cylindrical part 3 flows along the wall surface of the second end plate part 5 connected to the cylindrical part 3 as shown by an arrow 54, and finally finally It flows into the outflow pipe 7 from the water collecting section 9. Since the water collection part 9 is arrange | positioned on the central axis of the water tank 1, and the distance between the water collection part 9 and the 2nd end plate part 5 is uniform, the tap water W is the periphery of the water collection part 9. The speed when arriving at is constant. For this reason, the tap water W in the vicinity of the water collecting section 9 efficiently flows into the outflow pipe 7 from the water collecting section 9 without generating a pulsating flow or the like.

  As described above, the water tank 1 of the present embodiment supplies the tap water W to the inside of the tank body 2 from the distributor 10 connected to the tank inner end 7 of the inflow pipe 6. The flow of the tap water W is optimized, and the tap water W moves very smoothly in the tank body 2. As a result, the water storage tank 1 of the present embodiment can cause the tap water W to reach the water collecting part 9 without being retained, and can flow out from the outflow part 7 to the outside. Below, the result of having verified the flow of the tap water W inside the tank main body 2 by the fluid analysis (simulation) and experiment about the water storage tank 1 of a present Example is demonstrated in detail.

  FIG. 4 schematically shows the flow direction of the tap water W by arrows based on the result of analyzing the steady flow field inside the tank body 2 by performing steady analysis, which is one method of fluid analysis. FIG. The analysis of the steady flow field here means that the tank body at the time when a sufficient amount of time has passed since the supply of the tap water W has started and the physical quantity of the flow of the tap water W no longer changes with time. It is the result of having calculated | required the flow velocity and flow direction of the tap water W of 2 inside by numerical calculation. The water supplied from the distributor 10 generates a slight swirling flow in the vicinity of the first end plate 4 and around the inflow pipe 6. However, in the downstream of the swirl flow, a water flow that moves from the lower part of the cylindrical part 3 to the upper part is generated and the flow is not disturbed, and in the region from the central part of the downstream cylindrical part 3 to the second end plate 5, It smoothly flows toward the water collecting section 9. Further, the flow velocity of the tap water W inside the tank body 2 at this time is slightly faster around the first end plate portion 4 and the inflow pipe 6, while between the cylindrical portion 3 and the second end plate portion 5. It becomes almost constant. The accuracy of the simulation results relating to the flow direction and flow velocity has been verified by experiments using the tank body 2, and it has been confirmed that the flow inside the water storage tank 1 of Example 1 is an extruded flow. ing.

  In FIG. 5, based on the analysis result of the above-mentioned steady flow field, the water diffusion analysis in the tank body 2 of the present embodiment is performed, and the tank when a certain time has elapsed from the start of the supply of tap water W The result of having analyzed the exchange situation of the water inside the main body 2 is shown. In FIG. 5, the scalar variable used as an indicator of the replacement status inside the tank body 2 is that the tap water previously filled in the tank body 2 is replaced with newly supplied tap water W after a certain period of time has passed. It is a value indicating the ratio. The closer the numerical value is to 1, the higher the ratio of replacement. According to the result of this diffusion analysis, the scalar variable shows a value larger than 0 in all areas inside the tank body 2 in this embodiment, and there is no portion where the tap water stays. confirmed. Further, in the tank main body 2 of the present embodiment, the proportion of the newly supplied tap water W is higher as the distance to the distributor 10 is closer, and the proportion of the new tap water W becomes lower as the water collecting unit 9 is approached. It was confirmed, and this also revealed that the flow was optimized in the tank body 2 of this example.

  Furthermore, based on the result of the diffusion analysis, the accumulated amount (volume) of the tap water W newly supplied from the start of the analysis and the newly supplied tap water W included in the water flowing out from the outlet. The relationship with the volume% of concentration was calculated | required and this was made into the replacement | exchange degree of the water of a water tank. In FIG. 7, the analysis result of the replacement degree of the water of the water tank 1 of Example 1 is shown. Here, the replacement magnification shown on the horizontal axis of FIG. 7 is a ratio of the integrated amount of the tap water W newly supplied to the capacity of the tank body. As shown in FIG. 7, from the start of supply of new tap water W until the replacement magnification becomes 0.4, the tap water is newly supplied into the tap water flowing out from the outlet 7 of the water tank 1 of the first embodiment. Tap water W is not included. However, after that, the ratio of the newly supplied tap water W contained in the water flowing out from the outlet 7 increases rapidly, and the new supply flowing out from the outlet 7 when the replacement ratio becomes 2.72. The proportion of the tap water W is 99%. That is, when new tap water W corresponding to 2.72 times the capacity of the tank body 2 is supplied, the replacement of the tap water 1 in the tank body 2 is almost completed. The accuracy of the result of the replacement degree was also confirmed by an experiment using the tank body 2.

  From the results of all the above fluid analysis and verification by experiment, in the water tank 1 of the present embodiment, an optimized extrusion flow is formed such that the supplied tap water W pushes out the previously stored water. The tap water W supplied to the tank body 2 moves inside the tank body 2 without flowing out and flows out from the outlet 7 so that the tap water W inside the tank 2 is quickly replaced. It became clear.

  A distributor 20 having a structure different from that of the distributor 10 of the first embodiment is arranged in the water storage tank of the present embodiment. About another structure and arrangement | positioning of the distributor 20 in a water tank, it is the same as 1st Example, attaches | subjects the same code | symbol and omits duplication description.

  FIG. 3 shows a longitudinal sectional view of the distributor 20. The distributor 20 includes a cylindrical peripheral wall portion 21 disposed so as to surround the tank inner end portion 8 of the inflow pipe 6, an inner wall portion 25 disposed concentrically inside the peripheral wall portion 21, a peripheral wall portion 21, and An annular plate portion 22 that connects between the inner wall portion 25 and the tank inner end portion 8, and a disc portion 23 that closes the peripheral wall portion 21 and the end portions of the inner wall portion 25 are provided. All members of the distributor 20 are made of stainless steel. The peripheral wall portion 21 is formed by processing a punching metal having a plurality of openings 24 formed at uniform intervals into a cylindrical shape. Similarly, the inner wall portion 25 is formed by processing a punching metal having a plurality of openings 26 formed at uniform intervals into a cylindrical shape.

  Although the same punching metal can be used for the peripheral wall portion 21 and the inner wall portion 25, the opening is made so that the tap water W discharged from the opening 26 of the inner wall portion 25 collides with the inner surface of the peripheral wall portion 21. Preferably, the arrangement of 26 is adjusted. Since the tap water W supplied from the inflow pipe 6 collides with the peripheral wall portion 21 immediately after flowing out from the opening 26 of the inner wall portion 25, the tap water W is once mixed and stirred inside the peripheral wall portion 21 and the flow velocity becomes uniform. Thereafter, the tap water W flows out from the opening 24 of the peripheral wall portion 21 around the distributor 20 in a state where the flow direction and the flow velocity are further controlled.

(Comparative example)
As a comparative example, a water collecting part is provided at the inner end of the tank of the outflow pipe, but the internal flow is verified by fluid analysis and experiment for a water tank without a distributor at the inner end of the tank of the inflow pipe. The results are shown below. The inflow pipe of the water tank of the comparative example is introduced into the tank while maintaining the same diameter from the connection position of the water main, and its end is arranged to face the first end plate part. Yes. The water tank of the comparative example and the water tank 1 of Example 1 have the greatest difference in the configuration with or without a distributor, and the effect of the distributor becomes clear by comparing the two.

  FIG. 6 schematically shows the direction of the flow of tap water W by arrows based on the result of analyzing the steady flow field inside the tank body 2 by performing steady analysis, which is one method of fluid analysis. FIG. As shown in FIG. 6, in the comparative example, the tap water supplied from the inflow pipe flows in various directions in the vicinity of the first end plate 4 and around the inflow pipe 6, and the flow is disturbed. Form. Thereafter, the flow is parallel to the cylindrical portion at the lower portion of the cylindrical portion, while the flow from the vicinity of the center line of the cylindrical portion to the upper portion is not a constant flow, and the generation of vortices is recognized. Such disturbance of the upper flow also occurs around the water collecting portion and the second end plate facing the water collecting portion, and as a result, a smooth flow is only observed at the lower portion of the tank body. In addition, the flow rate of the tap water W in a steady state is faster between the cylindrical part and the second end plate part, while it is slower in the upper part from the vicinity of the center line of the cylindrical part and the second end plate part, It has been confirmed that the flow velocity is uneven.

  About the water tank of the comparative example, the diffusion analysis similar to the water tank 1 of Example 1 was performed. And based on the result, the water replacement degree of the water tank of the comparative example was analyzed. In FIG. 7, the water replacement degree of the water tank of a comparative example is shown with the water tank 1 of Example 1. FIG. In the water tank of the comparative example, about 10% of the newly supplied tap water W is included in the tap water flowing out from the outlet immediately after the start of the supply of the new tap water W. The rate of increase of the newly supplied tap water W contained in the tap water flowing out from the outlet with respect to the amount of water increases only slowly. In the comparative example, when the replacement magnification becomes 10.75, the ratio of the newly supplied tap water W flowing out from the outlet 7 is 99%. That is, in the comparative example, when new tap water W corresponding to 10.72 times the capacity of the tank body is supplied, the replacement in the water storage tank is almost completed. The result of the degree of change was also verified by an experiment using a comparative water tank. From the above results, in order to replace the tap water in the water tank of the comparative example, it is necessary to supply about four times as much tap water W as the water tank 1 of the first embodiment, and the time required for the replacement also becomes longer. Became clear.

  From the results of the above fluid analysis and experiment, in the case of the comparative water tank without a distributor at the inner end of the tank of the inflow pipe, the supplied tap water W has different flow rates at the lower and upper parts of the water tank. Since a mixed flow indicating the direction of flow is formed and the flow of tap water W in the tank is not optimized, a large amount of water is required before the tap water W is replaced as compared with the water storage tank of the first embodiment. It became clear that it was necessary to supply water W, and that it took a very long time, and the effect of providing the distributor 10 at the tank inner end 16 of the inflow pipe 6 became clear.

  As mentioned above, although the specific example of this invention was described in detail in the Example, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. For example, in the embodiment, the first and second end plate portions 4 and 5 are semi-elliptical end plates, but the end plate portion has a curved inner surface facing the rectifying means and the water collecting portion. A dish-shaped end plate, a full hemispherical end plate, or the like can be used. In the embodiment, the connection method between the distributor 10 and the inflow pipe 6 is welding. However, the distributor 10 can be fixed to the inflow pipe 6 by screwing or other metal connection methods.

1 Reservoir 2 Tank body
DESCRIPTION OF SYMBOLS 3 Cylindrical part 4 1st end plate part 5 2nd end plate part 6 Inflow pipe 7 Outflow pipe 8 Tank inner end part 9 of inflow pipe Catchment parts 10 and 20 Distributors 11 and 21 Circumferential wall parts 14, 24 and 26 Opening 25 Inner wall

Claims (6)

A water tank comprising a substantially cylindrical tubular portion, a tank body having first and second end plate portions for sealing both ends of the tubular portion, and an inflow pipe and an outflow pipe attached to the tank body. Because
A tank inner end of the inflow pipe is arranged to face the first end plate part, and a tank inner end of the outflow pipe is arranged to face the second end plate part;
In the tank inner end of the inflow pipe is provided with rectifying means for discharging water introduced into the tank main body through the inflow pipe in a radial direction in the tank main body,
A water storage tank, wherein a conical water collecting portion is provided at an inner end portion of the tank of the outflow pipe.   The said rectification | straightening means is a cylindrical box type distributor, This distributor has the cylindrical surrounding wall part in which the said inflow pipe was surrounded and several opening was formed, The said 1st aspect is characterized by the above-mentioned. The described water tank. The distributor
The peripheral wall;
An annular plate portion connecting the peripheral wall portion and the inflow pipe;
A disc portion for closing a terminal portion of the peripheral wall portion;
The water storage tank according to claim 2, comprising a plurality of support plates that divide the inside of the peripheral wall portion at equal intervals. The distributor
The peripheral wall;
A plurality of openings are formed, and a cylindrical inner wall portion formed concentrically with the peripheral wall portion inside the peripheral wall portion,
An annular plate portion connecting the peripheral wall portion and the inner wall portion, and the inflow pipe;
The water storage tank according to claim 2, comprising a disk portion connected so as to close the end portions of the peripheral wall portion and the inner wall portion. The first and second end plate portions each have a curved inner surface,
The distributor and the conical shape are positioned on a central axis (C) of the cylindrical portion of the tank body connecting the center of the curved inner surface of the first end plate portion and the center of the curved inner surface of the second end plate portion. There is a water collection section,
The water storage tank according to any one of claims 2 to 4, wherein the opening formed in the peripheral wall portion of the distributor is opposed to a curved inner surface of the first end plate portion.   The water storage tank is a constantly-replaceable water storage system installed in the middle of the water main path by connecting the outer end of the tank of the inflow pipe and the outer end of the tank of the outflow pipe to the main water pipe. It is a tank, The water storage tank of any one of Claims 1 thru | or 5 characterized by the above-mentioned.