JP2009264098A - Emergency water storage tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent retention of water in a water storage tank to the utmost without making difficult the maintenance and inspection of the water storage tank or increasing a manufacturing cost in an emergency water storage tank interposed at a water pipe or another fresh water supply pipe to allow the use of stored fresh water in an emergency. <P>SOLUTION: An inflow port 21 of fresh water to the water storage tank provided with end plates 12, 13 of circular arc shape at both ends is opened toward the inflow side end plate 12 on the centerline (a) of a cylindrical drum 11, and an outflow port of fresh water from the water storage tank is opened onto the center line (a) close to the rear side of the inflow port 21. A discoid shielding disk 4 leaving an annular communicating opening 42 between itself and the cylindrical drum is provided between the inflow port 21 and the outflow port. The inflow port 21, the outflow port and the shielding disk 4 are preferably located close to the outflow side end plate 13. Further, the tip part 22 of an inflow pipe 2 is formed as a guide pipe 23 enlarged toward the inflow side end plate 12 on the centerline of the cylindrical drum. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an emergency water tank provided in the middle of a water pipe or other fresh water supply pipe. Normally, fresh water is supplied via the water tank and stored in the water tank in the event of an emergency such as an earthquake. The present invention relates to an emergency water tank that can use fresh water.

  Emergency water storage tanks (hereinafter simply referred to as “water storage tanks”) installed in water pipes and other fresh water supply pipes are generally buried underground and supply water such as inflow pipes and faucets that lead to water supply sources. An outflow pipe connected to the mouth is connected. In normal times, water flowing in from the inflow pipe passes through the water storage tank and is sent from the outflow pipe to the water supply port. When water supply pipes are damaged due to an earthquake or the like and water supply is stopped, fresh water stored in the water tank is used as emergency water.

  In order to guarantee the quality of the water supplied from the water pipe provided with such a water storage tank, it is necessary that the water in the water storage tank is constantly replaced by the incoming water. If water stays in a part of the water storage tank, there is a concern about the deterioration of the water in that part, and it becomes impossible to guarantee the quality of the water not only in an emergency but also in a normal time. The water storage tank has a cylindrical shape with end plates at both ends, and conventionally, an inflow pipe is connected to the center of one end plate and an outflow pipe is connected to the center of the other end plate. However, in this structure, a small swirling flow occurs in the corner part that becomes the connection part around the cylindrical body and the end plate due to the main flow flowing in the axial direction in the cylindrical body, and it becomes difficult for the water in this corner part to flow to the outflow pipe, There is a problem that water tends to stay in this corner.

  In order to solve this problem, various proposals have been made in the past, including a structure in which the end plate is conical and an inflow pipe and an outflow pipe are connected to the top of the cone (Patent Document 1, Patent Document 2, etc.). . For example, in Patent Document 3, in a water storage tank that is buried under the ground, the tip of the inflow pipe passes through the center of the inflow side end plate and protrudes inside the water storage tank, and faces the outlet of the inflow pipe. Thus, there has been proposed a water storage tank having a structure in which a current changing plate is provided and a discharge port of a large number of branch pipes is provided in the outflow side end plate so that water flowing through the branch pipes merges into one outflow pipe.

  Further, in Patent Document 4, a T-shaped pipe that makes the outflow direction of water a circumferential direction is provided at the tip of the inflow pipe that protrudes into the water storage tank from the circumference immediately adjacent to the inflow side end plate of the horizontally installed water storage tank. In addition, a perforated plate for equalizing the flow of water in the longitudinal direction of the water storage tank is provided, and a taper pipe that extends toward the connecting portion between the end plate on the other end of the water storage tank and the cylindrical body is provided. The structure which connected the exit pipe line to the part which becomes is proposed.

  Patent Document 5 discloses a water storage tank in which an opening of an inflow pipe is branched back and forth, one of which is a nozzle facing the center of the inflow side end plate, and the other is an enlarged diameter portion having a perforated plate attached to the outlet end. Proposed. The flowing water from the nozzle diffuses along the curved surface of the end plate and mixes with the surrounding water, and then moves toward the outflow pipe along the peripheral wall of the water storage tank. On the other hand, the flowing water from the enlarged diameter portion spreads to the periphery, mixes with the flow from the nozzle along the peripheral wall, and goes to the outflow pipe. On the outflow side, the flow is converged and flows out by a circular curved end plate.

  Further, in Patent Document 6, in a cylindrical water tank provided with circular curved end plates at both ends, a spherical flow rectifying plate is provided opposite to an inflow port opened at the center of the inflow side end plate, and the center of the outflow side end plate is provided. There has been proposed a water storage tank having a structure in which a flat rectifying plate is provided to face an open outlet. The inflowing water collides with the spherical rectifying plate and changes direction, hits the inflow side end plate, changes direction along the circular curved surface, and goes toward the outflow side along the inner surface of the cylindrical body. On the outlet side, the water that hits the flat rectifying plate diffuses around the flat rectifying plate, thereby preventing water from staying in the corner of the water storage tank.

Japanese Utility Model Publication No. 63-64693 Japanese Utility Model Publication No. 3-29421 Japanese Utility Model Publication No. 58-103253 JP 57-133881 A JP-A-9-323790 JP-A-10-102553

  However, the structures of Patent Documents 1 and 2 have a problem that the length of the water storage tank becomes long if the corner portions are to be effectively prevented from staying. In addition, as in Patent Document 3, when a large number of outlets and inlets are provided on the end plate, there is a problem that the piping structure becomes complicated and the water storage tank becomes expensive. Moreover, although patent document 4 is considered that the retention prevention of the water of a water storage tank corner is considered to be performed effectively, since flowing water resistance increases and a pressure loss is large, and a perforated plate partitions the inside of a water storage tank. In addition, there are problems such as difficulty in inspecting the inner surface coating film and increasing the production cost of the water storage tank. This problem is common to water tanks having a structure in which a partition plate is provided inside the water tank to regulate the water flow inside the water tank.

  The structure of Patent Document 5 does not cause retention of water at the connection portion between the inflow side end plate and the cylindrical body, but cannot effectively prevent retention of water at the connection portion between the outflow side end plate and the cylindrical body. In addition, as in Patent Document 6, in a structure in which a shielding disk that changes the flow direction to the circumferential direction is opposed to both the inflow port and the outflow port, the flow is long in the axial direction of the water tank at the center of the cylindrical body. As a result, a swirling flow is generated, and a new problem occurs in which the stagnation occurs in the central portion of the water storage tank.

  The present invention provides a technical means for preventing water from staying in the water tank as much as possible without making maintenance and inspection inside the water tank difficult and increasing the manufacturing cost of the water tank. It is an issue.

  In the water storage tank having a structure in which arc-shaped end plates 12 and 13 having concave surfaces facing inward are provided at both ends of the cylindrical body 11, the fresh water inlet 21 to the water storage tank is connected to the center line a of the cylindrical body 11. Opening toward one end plate (inflow side end plate) 12 on the upper side, and providing an outlet 31 of fresh water from the water storage tank so as to open on the center line a close to the back of the inlet 21, The above problems are solved. Furthermore, the water storage tank of the present invention is a disc-shaped shield that leaves an annular communication opening 42 between the inlet 21 and the outlet 31 provided as described above and the inner peripheral surface 16 of the cylindrical body. A disc 4 is provided.

  With the above-described structure, in the water storage tank of the present invention, two axial swirl flows 25 and 35 on the inflow side and the outflow side are generated in the water storage tank, and pass through the annular communication opening 42 from the outer peripheral portion of the inflow side swirl flow 25. Thus, the water merges into the outflow side swirl flow 35 and flows out from the outlet 31 that opens to a position that becomes the end of the outflow side swirl flow 35. Most of the water in the inflow-side swirl flow 25 flows to the outflow side through the communication opening 42, but a part of the water becomes an inward flow (flow toward the center line a) along the shielding disk 4. 4 is prevented from staying along the surface 4. Further, most of the water in the outflow side swirling flow 35 flows out from the outflow port 31, but a part of the water becomes an outward flow (flow toward the radial direction) along the shielding disk 4 and stays along the surface of the shielding disk 4. Is prevented. This part of the circulating water merges with the next water and flows to the communication opening 42 and the outlet 31. Therefore, the ratio of the water that is repeatedly circulated is small, and there is a portion where the water stays in the reservoir body. Since there is nothing, it is possible to prevent the quality of water flowing out of the water tank from deteriorating.

  In addition to the basic structure described above, the water storage tank of the present invention is further provided with the inlet 21, the outlet 31, and the shielding disk 4 positioned closer to the outflow side end plate 13, so that the inlet 21 is further at the tip. The tip portion 22 of the inflow pipe 2 that is open is a guide pipe 23 that expands toward the inflow side end plate 12 on the center line of the cylindrical body, so that the water replacement rate in the water tank (filled with old water) The value obtained by dividing the amount of old water that flows out when the amount of new water equal to the volume thereof flows into the storage tank is divided by the volume.

  The water tank usually needs to be provided with a manhole 14 (the same applies to 14a and 14b) for internal inspection and maintenance, and the manhole is provided at the upper part of the horizontal cylindrical water tank body. In the water storage tank according to the invention of the present application, the old water in the water storage tank main body is quickly replaced with new water (water that newly flows in) by the circulation of the water in the water storage tank main body described above. However, since the manhole 14 is often provided in a shape protruding from the upper portion of the water tank main body, if water stays in this portion, there is a possibility that the replacement rate of water is lowered.

  This problem can be solved by introducing the inflow pipe 2 or the outflow pipe 3 into the tank through the manhole 14 and providing the auxiliary inflow hole 27 or the auxiliary outflow hole 37 in a portion of these pipes passing through the manhole 14. Of course, both the auxiliary inflow hole 27 and the auxiliary outflow hole 37 may be provided. By providing the auxiliary inflow hole 27, the water that is about to stay in the manhole 14 is pushed out to the side of the water tank main body and flows out on the circulating flow of the water tank main body. Further, by providing the auxiliary outflow hole 37, the water in the manhole 14 portion is sucked out and new water flows into the manhole 14 portion from the water storage tank main body side.

  Further, when the shielding disk 4 is fixed to and supported by the outflow pipe 3 (or the inflow pipe 2) and the inner diameter of the manhole 14 provided in the water tank main body is larger than the outer diameter of the shielding disk 4, the inflow By attaching all of the pipe 2, the outflow pipe 3 and the shielding disk 4 to the lid plate 15 of the manhole and fixing the lid plate to the manhole port, the water storage tank of the present invention can be obtained, which is extremely easy to manufacture. At the same time, the existing water tank can be easily used as the water tank having the structure of the present invention.

  According to the structure of the present invention described above, it is possible to prevent the stagnation of water in the water tank interposed in the water supply pipe with a very simple structure, and the water in the water tank is constantly replaced and You can ensure that fresh water is always stored.

  In particular, a manhole larger than the diameter of the shielding disk 4 is provided in the water storage tank so that the inflow pipe 2 and the outflow pipe 3 are supported by the lid of the manhole, and the shielding disk 4 is fixed to the back surface of the inflow pipe 2 or the outflow pipe 3. If the structure to support is adopted, the inlet 21, the outlet 31 and the shielding disk 4 can be arranged in the reservoir through the manhole after the reservoir body is manufactured, and manufacturing and construction are very easy. There is an effect of becoming.

Side view showing the first embodiment Side view showing the second embodiment Side view showing the third embodiment Plan view of the water tank in FIG. 3 is a perspective view of the water tank of FIG. The perspective view which shows the principal part of 4th Example Side view showing essential parts of the fifth embodiment The perspective view which cut and showed the water storage tank of the 6th example vertically The perspective view which looked at the water tank of Drawing 8 from the other direction The graph which shows the result of having tested the degree of the stay of water about the water tank of the 1st-3rd Example About the water tank of the third embodiment, a graph showing the number of replacements when there is a temperature difference between the inflowing water and the water in the water tank The graph which shows the result of having tested the degree of the retention of water when the temperature of the inflowing water is lower than the temperature of the water in the water tank for the water tanks of the third to fifth embodiments.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing the first embodiment, FIG. 2 is a side view showing the second embodiment, FIG. 3 is a side view showing the third embodiment, and FIG. 4 is a plan view of the third embodiment. 5 is a perspective view showing the third embodiment cut vertically, FIG. 6 is a perspective view showing the main part of the fourth example, FIG. 7 is a side view showing the main part of the fifth example, 8 and 9 are perspective views of the sixth embodiment cut vertically.

  In these drawings, 1 is a water tank main body, 11 is its cylindrical body, 12 is an inflow side end plate, 13 is an outflow side end plate, and both end plates 12 and 13 are arc-shaped end plates with concave inner surfaces. 1 to 7 and 14a and 14b in FIGS. 8 and 9 are manholes provided in the water tank main body, and 15 and 15a and 15b are manhole cover plates. Reference numeral 2 denotes an inflow pipe, 21 denotes an inlet at the tip thereof, 3 denotes an outlet pipe, 31 denotes an outlet at the tip thereof, and 4 denotes a shielding disk. Reference numeral 42 denotes an annular communication opening formed between the outer peripheral edge 41 of the shielding disc 4 and the inner peripheral surface 16 of the cylindrical body 11.

  In the structure of FIGS. 1 to 7, the inflow pipe 2 and the outflow pipe 3 extending into the water tank main body 1 are supported by welding their base ends to a manhole cover plate 15 via a joint such as a socket. The shield disc 4 is fixed by welding the center to the tip of the outflow pipe 3 bent toward the inflow side end plate 12. The outflow port 31 in the structure of FIGS.

  As a configuration common to all of these embodiments, the distal end portion 22 of the inflow pipe 2 is bent toward the center of the inflow side end plate 12, and the inflow port 21 at the distal end thereof is on the center line a of the cylindrical body 11. , The opening side end plate 12 is open toward the center. The shielding disk 4 has an annular communication opening 42 having a predetermined width between the outer peripheral edge 41 and the inner peripheral surface 16 of the cylindrical cylinder 11 with the center of the circle being coincident with the center line a of the cylindrical cylinder. Is in place. The outflow pipe 3 is provided with its outlet 31 on the center line a of the cylindrical body. In the example of FIGS. 1 to 7, the outlet 31 is open on the side surface of the outflow pipe tip 32 bent toward the inflow side end plate 12 on the center line a. Since they are provided symmetrically around the line a, the center of the outlet 31 combining them is on the center line a. In addition, since the front-end | tip part 32 of an outflow pipe is sufficiently thin compared with the cylindrical trunk | drum 11, even when it is a case where the outflow port 31 is provided only in the one side, the outflow port 31 is provided on the centerline a. Included in the structure.

  In the first embodiment shown in FIG. 1, the shielding disk 4 is provided at the center position of the axial length of the water storage tank, and the inlet 21 and the outlet 31 are close to the front and back surfaces of the shielding plate. And are open. In the second embodiment shown in FIG. 2, the shielding disc 4 is offset in the axial direction from the center of the cylindrical body 11 and is provided at a position close to the outflow side end plate 13, and is close to the shielding disc 4. The inflow port 21 and the outflow port 31 are also opened at positions close to the outflow side end plate 13.

  In the water storage tank according to the present invention, as shown in FIG. 2, by the momentum of the water flowing in from the inflow port 21, the center of the water storage tank is directed toward the center of the inflow side end plate 12 and is inverted along the inflow side end plate 12. An inflow-side swirling flow 25 that flows in the reverse direction is generated at the peripheral edge of the cylindrical body. Then, the flow at the peripheral edge of the inflow side swirl flow 25 passes through the communication opening 42 and becomes an inward flow along the outflow side end plate 13, and the flow from all directions collides and reverses at the center of the outflow side end plate 13 to block the shielding circle. By flowing toward the center of the plate 4, an outflow side swirl flow 35 is generated. And the water of the outflow side turning flow 35 flows out from the outflow port 31 opened at the terminal part of the turning flow. A part of the water of the inflow side swirl flow 25 and the outflow side swirl flow 35 becomes an inward flow 26 and an outward flow 36 along the surface of the shielding disk 4 and merges with the subsequent swirl flow water.

  The structure of FIGS. 2 to 9 is a structure in which the axial length of the inflow side swirl flow 25 is longer than the axial length of the outflow side swirl flow 35. As will be described later, the structure of the second to sixth embodiments in which the shielding disc 4 is provided at a position close to the outflow side end plate 13 and the axial length of the inflow side swirl flow 25 is lengthened. It is superior to the structure of the first embodiment installed in This is because the inflow speed from the inflow port 21 is faster than the speed of the water flow through the communication opening 42 and the direction thereof is stable, so that the inflow side swirl flow 25 is more stable than the outflow side swirl flow 35. Therefore, if the flow path of the inflow side swirl flow is made longer than the outflow side swirl flow 35 where the flow is unstable (and therefore new and old water are likely to be mixed together), the swirl is repeatedly swirled as a whole. This is probably because the amount of water can be reduced.

  In the third embodiment shown in FIGS. 3 to 5, the shielding disk 4 is provided at a position close to the outflow side end plate 13, and a loosely tapered guide tube 23 whose inflow port 21 side is widened at the tip of the inflow tube 2. This is the structure provided. This guide tube is a conical tube provided on the center line a of the cylindrical body and having a taper angle (inclination angle of the peripheral surface) of 2 to 10 degrees, preferably 2 to 5 degrees. Something is used. As will be described later, by providing the inlet 21 at the widened tip of the guide tube 23, the water replacement rate in the water storage tank can be significantly improved. This is considered to be because by providing such a guide tube 23, the inflow-side swirl flow 25 can be further stabilized and the ratio of the inward flow 26 can be reduced. If the taper angle of the guide tube 23 is too large, the water that flows out of the inlet 21 while diffusing will collide with the flow in the opposite direction of the peripheral edge to inhibit a stable flow. it is conceivable that.

  In the structure of FIGS. 1 to 5, a manhole 14 larger than the diameter of the shielding disk 4 is provided in the water tank main body 1, and the base ends of the inflow pipe 2 and the outflow pipe 3 are connected to the manhole cover plate 15 via a joint (not shown). The shielding disk 4 is welded to the outflow pipe 3. Therefore, the inlet 21, the outlet 31, and the shielding disc 4 can be installed at predetermined positions by installing the cover plate 15 in the manhole 14 without performing any processing on the water tank main body 1. Accordingly, this structure makes it extremely easy to manufacture the water tank of the present invention, and it is also possible to easily improve the existing water tank to the water tank of the present invention.

  FIG. 10 shows the structure of each of the embodiments described above. A small water tank is manufactured, and the old water that has been filled in the water tank when new water of the capacity of the water tank (number of replacements) is introduced. It is the graph which showed the result of having tested how much it remains in the water tank. The vertical axis is the ratio of the old water remaining in the water tank, and the horizontal axis is the number of replacements (the number of newly introduced water divided by the capacity of the water tank). The line O shown as “ideal” is a line when all the water in the water tank is replaced with new water just by flowing the same amount of water as the capacity of the water tank. A water tank cannot be manufactured. The line A shown as “inflow / outflow center (with disk)” is the line B shown as “inflow / outflow end (with disk)” of the water storage tank of the first embodiment. Line C shown as “inflow / outflow end portion (with taper tube, with disk)” of each of the water storage tanks is a test result for each of the water storage tanks of the third embodiment. As shown in the figure, all of the water storage tanks of the first to third embodiments are improved from the line E shown as “prior art product”, and the performance improvement of the water storage tank of the third embodiment is particularly remarkable. is there. In addition, the test result of the structure of the first embodiment with the shielding disk 4 removed is shown by a line D shown as “inflow / outflow center (no disk)” for reference, and the shielding disk 4 is not provided. In the structure, it is suggested that the performance may be lower than that of the prior art product. In addition, the prior art product used for the test has a structure in which an inflow port and an outflow port are provided at the peripheral edge portions of both end plates.

  As shown in FIG. 10, the water storage tank of the present invention has less water retention in the water storage tank, and in particular, in the structure of the third embodiment, the water retention in the tank is significantly reduced. However, in the subsequent test conducted by the inventors of the present application, a phenomenon was observed in which the retention of water in the water storage tank increased when the temperature of the water supply decreased rapidly. FIG. 11 shows the case where the temperature of the water supply is equal to the temperature of the water in the water tank (temperature difference 0 ° C.), the case where the temperature of the water supply is 3 ° C. higher than the temperature of the water in the water tank (temperature difference + 3 ° C.) When the temperature of water is 3 ° C. lower than the temperature of the water in the water tank (temperature difference −3 ° C.), the volume ratio A of old water in the water tank A = 1.0% (the old water in the water tank is 1. It is a figure which shows the result of having measured the replacement number R which shows how many times the volume of a water tank must be supplied by the time it becomes 0 volume% remaining state. As shown in the figure, the replacement number when there is no temperature difference between the fresh water and the old water is 3.91, and when the temperature difference is + 3 ° C. (the temperature of the new water is high), it is 4.17. While it was almost consistent with the test results, it was 6.64 when the temperature difference was −3 ° C. (the temperature of fresh water was low), and it was recognized that the number of replacements increased significantly. As a result of investigating this cause, since the manhole 14 is provided at the upper part of the water tank main body, when the temperature of the fresh water is low, the old water which is warm and therefore light in specific gravity stays in the manhole 14 portion, and the number of replacements is large. It was found that there was a significant increase.

  Accordingly, the inventors of the present application, as shown in FIG. 6, in the water tank of the third embodiment, a fourth embodiment in which an auxiliary inflow hole 27 is provided immediately below the manhole cover plate 15 of the inflow pipe 2, As shown in FIG. 7, with respect to the fifth embodiment in which the auxiliary outflow hole 37 is provided at a position immediately below the cover plate 15 of the manhole of the outflow pipe 3, the replacement number R when the temperature difference Δt = −3 ° C. and The volume ratio A of the old water was measured, and the result of FIG. 12 was obtained. Here, the basic structure is the structure of the third embodiment, the improvement 1 is the structure of the fourth embodiment, and the improvement 2 is the structure of the fifth embodiment. FIG. 12 also shows the test results when there is no temperature difference between the fresh water and the old water in the structure of the third embodiment for reference.

  As is clear from FIG. 12, the auxiliary inflow hole 27 is provided in the inflow pipe 2 or the auxiliary outflow hole 37 is provided in the outflow pipe 3 at a position immediately below the manhole cover plate 15. Even when there is a temperature difference between the water and the new water to be supplied, the replacement rate is improved to the same extent as when there is no temperature difference. In particular, the structure in which the auxiliary outflow hole 37 is provided in the outflow pipe 3 is effective in preventing the replacement rate from being lowered due to the temperature difference between the new water and the old water.

  6 and 7, the base ends of these pipes are welded to the manhole cover plate 15 via joints 28 and 38 provided at the base ends of the inflow pipe 2 and the outflow pipe 3. The auxiliary inflow hole 27 and the auxiliary outflow hole 37 are provided in the joints 28 and 38. This structure takes into account the ease of manufacture, but it is easy to perform tests in which the diameter and direction of the auxiliary inflow hole 27 and the auxiliary outflow hole 37 are changed, and maintenance points such as replacement of the piping in the tank. It can be said that it is excellent.

  In the test leading to the result of FIG. 12, the ratio of the diameters of the auxiliary inflow hole 27 and the auxiliary outflow hole 37 to the diameters of the inflow pipe 2 and the outflow pipe 3 is about 1/3. Since it is considered that the optimum value varies depending on the structure, the thickness of the pipe, the volume of the cylindrical body 11 and the manhole 14, etc., it is preferable to determine by performing a test.

  FIGS. 8 and 9 are views showing a sixth embodiment of the present invention. Only the manhole structure and the support structure of the shielding disk 4 are different from the third embodiment. In the sixth embodiment, two manholes 14a and 14b having a small diameter are provided, and the base end of the inflow pipe 2 is welded to the cover plate 15a of one manhole, and the manhole 14a and 14b flows out to the cover plate 15b of the other manhole. The proximal end of the tube 3 is welded. The outflow pipe 3 has a distal end bent toward the inflow side end plate 12 side on the center line a of the cylindrical body, and the outflow port 31 opens toward the center of the shielding disc 4. The shielding disk 4 is supported by three stays 43 erected on the inner wall of the cylindrical body 11.

  8 and 9, 45 is an inflow side water supply pipe, 46 is an outflow side water supply pipe, and 47 is a riser pipe for use in outdoor sprinkling. The riser pipe 47 has an opening at its base end at the bottom of the water tank so that the sediment in the water tank can be discharged if necessary, such as during maintenance of the water tank. It is. In case of emergency when the water supply is stopped, the water in the water storage tank is pumped up from a socket 48 (see FIG. 4) provided on the manhole cover plate by a pump or the like.

  Although the thing of this 6th Example does not change in performance from the thing of 3rd Example, the shielding disc 4 must be installed in the water tank beforehand. Since the two manholes 14a and 14b are provided so as to be connected to the inflow side and outflow side spaces partitioned by the shielding disc 4, the shielding disc 4 does not cause any trouble in maintenance and inspection inside the water tank.

2 Inflow pipe 4 Shielding disk
11 Cylindrical body
12 Inlet side panel
13 Outlet end panel
14 Manhole
15 Cover plate
21 Inlet
23 Guide tube
27 Auxiliary inlet
31 Outlet
37 Auxiliary outflow hole
42 Flowing water gap
45,16 Water supply pipe a Center line

Claims (6)

An emergency water tank installed in a water pipe or other water supply pipe (45, 46), which is normally supplied via the water tank so that the water stored in the water tank can be used in an emergency. In the emergency water tank
The cylindrical cylinder (11) is provided with arc-shaped inflow and outflow end panels (12, 13) with concave surfaces facing inward at both ends, and the fresh water inlet (21) to the water storage tank is the center of the cylindrical cylinder Opened on the line (a) toward the inflow side end plate (12), the fresh water outlet (31) from the water reservoir opens on the center line (a) close to the back of the inlet (21) The shielding disk (4) is disposed between the inlet (21) and the outlet (31), leaving an annular communication opening (42) between the inner peripheral surface of the cylindrical body. ), An emergency water tank.   2. The emergency according to claim 1, wherein the inlet (21), the outlet (31), and the shielding circular plate (4) are arranged at positions close to the outflow side end plate (13) of the water tank main body. Water tank.   A guide tube (in which the inlet (21) side toward the center of the inflow side end plate (12) extends on the center line (a) at the tip of the inflow tube (2) where the inflow port (21) is open at the tip ( The emergency water tank according to claim 1 or 2, wherein 23) is provided.   The inflow pipe (2) is guided into the water tank body through the manhole (14, 14a) provided in the water tank body, and the part of the inflow pipe passing through the manhole (14, 14a) passes through the inside of the inflow pipe. The emergency water storage tank according to claim 1, 2 or 3, further comprising an auxiliary inflow hole (27) through which a part of the flowing water flows into the manhole (14, 14a).   The outflow pipe (3) is led into the water tank body through the manhole (14, 14b) provided in the water tank body, and the part of the outflow pipe passing through the manhole (14, 14b) is inserted into the outflow pipe. The emergency water storage tank according to claim 1, 2 or 3, wherein an auxiliary outflow hole (37) for sucking water in a manhole (14, 14b) portion is provided.   The manhole (14) of the water tank main body has an inner diameter larger than the outer diameter of the shielding disk (4), the inlet pipe (2) having the inlet (21) open at the tip, and the outlet ( 31) is open and the outflow pipe (3) is supported by fixing its base end to the manhole cover plate (15), and the shielding disk is fixed and supported by the inflow pipe or outflow pipe. The inflow port, the outflow port, and the shielding disk are arranged at predetermined positions in the water storage tank by fixing the lid plate to a manhole, according to any one of claims 1 to 5. Emergency water tank.

Images