JP2009184679A - Water receiving tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably prevent corrosion of a top plate, a side plate or the like facing a vapor phase part of a water receiving tank body by rapidly and reliably exhausting chlorine gas separated from water during the water discharge or freed from stored water and accumulated in the vapor phase part of the water receiving tank body, and to prevent any increase in the cost of the water receiving tank. <P>SOLUTION: The water receiving tank body 1 is formed of a stainless steel having a lower corrosion resistance against chlorine gas, compared with that specified as SUS329J4L, and a vent pipe 7 having a vent pipe body and a hood is provided on a side plate 1b opposing the water receiving tank body 1 so as to communicate with a vapor phase part 6 above the highest water levels H.L of the water W to be stored. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a water receiving tank capable of preventing corrosion of a top plate and a side plate facing a gas phase portion of a water receiving tank main body.

  Conventionally, water tanks were made of synthetic resin such as iron or FRP, but sanitary aspects such as generation of algae in water tanks installed outdoors, fireproof and seismic strength viewpoints, recyclability viewpoints, Furthermore, recently, stainless steel ones are often used because of their low price due to widespread use and their long-term use and low running costs. Thus, an example of a conventional stainless steel water receiving tank is shown in FIG.

  In the figure, reference numeral 1 denotes a water tank body made of stainless steel and a rectangular parallelepiped, and 2 is arranged on the upper part of the water tank body 1 so that the lower end penetrates the top plate 1a and is positioned slightly below the top plate 1a. A water supply pipe 3 for supplying tap water W to the water tank main body 1 by a pump not shown is connected to the lower part of the side plate 1b of the water tank main body 1 and uses the water W received by the water tank main body 1 The intake pipe 4 for feeding to the location is received in the water receiving tank body 1 and the highest water level H. An overflow pipe installed vertically in the water receiving tank main body 1 to discharge the water W that has reached above L to the outside, 5 is a vent pipe with a hood provided on the top plate 1a of the water receiving tank main body 1 , 6 is a gas phase part in which a gas such as air or chlorine gas stays in the upper part of the water surface in the water receiving tank body 1. The vent pipe 5 is for exhausting and supplying air when the water surface height of the water receiving tank main body 1 changes due to the supply or intake of water W, so as to keep the pressure of the gas phase section 6 constant. Although not shown in the figure, the liquid level of the water W in the water receiving tank body 1 is the lowest water level H.V. When it reaches L, water supply is started and the highest water level H. A liquid level detecting means is provided so that the water supply can be stopped when the temperature reaches H.

  In the water receiving tank, the water W supplied from the water supply pipe 2 into the water receiving tank main body 1 has the highest water level H.P. Although it is stored until it reaches L, as the water W is released from the water supply pipe 2, the chlorine gas separated and generated from the water W is redissolved in the condensed water in the gas phase portion 6 in the water receiving tank body 1. As a result, the chloride ions are concentrated and the pH is lowered, and corrosion may occur on the bottom surface of the top plate 1a, the inner surface of the side plate 1b, the joint welded portion, etc. of the water receiving tank body 1 facing the gas phase portion 6.

  Further, especially in the summer, the dissolved chlorine in the feed water is liberated, and the chlorine concentration in the gas phase part 6 at the upper part of the water receiving tank body 1 becomes abnormally high. Corrosion of the plate 1a and the side plate 1b cannot be prevented.

  For this reason, conventionally, the water receiving tank main body 1 has the highest water level H.V. In order to avoid corrosion of the portion slightly above and below L, stainless steel SUS329J4L having high corrosion resistance to chlorine gas is used in this portion. In addition, the stainless steel which comprises the water-receiving tank main body 1 is SUS444 whose corrosion resistance with respect to chlorine gas is lower than SUS329J4L except the location which uses SUS329J4L. SUS329J4L and SUS444 are both defined in the JIS standard.

As a prior art document of a water receiving tank, there exist patent documents 1-4, for example. Thus, in Patent Document 1, a partition pipe is provided so as to surround the water supply pipe in the tank body, and the volume of the water discharge space exposed to chlorine gas is reduced by reducing the volume of the water discharge space. In Patent Document 2, two slide tubes that are slidable in the vertical direction are provided, an exhaust port and a float member are provided at the lower part of one set of the slide tubes, and the float member is floated on a water storage surface to exhaust air from the exhaust port. The water tank is not corroded even when chemicals that generate corrosive gas are used. In Patent Document 3, an overflow pipe of a tank installed outdoors is used as an aeration pipe, and when the overflow pipe functions as an aeration pipe, an intruder removal filter attached to the inner end of the tank or In order to prevent clogging of the net body due to wind and rain or contamination of the water storage by dust or the like, the filter or net body and the float are accommodated one after another in close contact with the inner periphery of the cylindrical body. . In Patent Document 4, a small-capacity auxiliary tank in which the water level is always located at the upper part of the main tank is provided, and chlorine gas liberated from water is retained in the auxiliary tank to prevent corrosion of the main tank. .
JP 2001-301883 A JP 2003-20698 A Japanese Utility Model Publication No. 4-132092 Japanese Utility Model Publication No. 61-73591

  However, as described above, in the water receiving tank of FIG. In order to avoid corrosion of the upper part from a slightly lower side than L, SUS329J4L having high corrosion resistance is used for this part as a stainless steel plate. However, when the water receiving tank is large, water W is used at the peak when water is used. Is the lowest water level. From L to full water again, the highest water level It takes several hours to reach L, and during that time, the part not using SUS329J4L may be corroded by being exposed to an atmosphere such as chlorine gas. However, if the stainless steel plate of these parts is SUS329J4L, the amount of use increases and the price becomes expensive.

  The vent pipe 5 is provided as an air vent so that the air pressure in the gas phase section 6 in the water receiving tank body 1 does not fluctuate and interfere with water receiving or water intake during water receiving or water intake. It currently does not work for removal or dilution.

  In patent document 1, especially in the summer, dissolved chlorine in the water supply is liberated, and the chlorine concentration in the space above the tank main body becomes abnormally high. Therefore, the tank main body is prevented from corroding only by surrounding the water supply pipe with a partition pipe. I can't.

  In Patent Document 2, the exhaust port slides up and down through the slide tube together with the float member so as to be always located near the water surface, but the slide mechanism needs to be frequently maintained. However, a normal general water receiving tank is required to be maintenance-free, and the system of Patent Document 2 is not practical.

  In Patent Document 3, since the overflow pipe is long, the ventilation resistance is increased. Also, since the overflow pipe is paired with the water supply pipe, a plurality of overflow pipes are not provided. For this reason, it is difficult to exhaust the chlorine gas in the tank sufficiently.

  In Patent Document 4, the capacity of the main tank is determined in consideration of the amount of water used. However, especially when there is a cafeteria facility in a hospital or school facility, water is used intensively at the time of preparation. By the time, the amount of water in the main tank becomes less than half and the water level drops. In order to avoid this, it is conceivable to increase the water supply from the mains more than the amount used, but the maximum water supply is determined in consideration of the usage rate from the viewpoint of water charges, etc. When used, it is inevitable that the water supply will not catch up and the water level in the main tank will drop.

  Further, as described above, in order to keep the maximum water supply amount to the minimum necessary, it takes several hours for the main tank to become full. At this time, the wall surface of the main tank is exposed to chlorine gas. Especially in summer, the water is at a temperature at which chlorine gas in the water is easily liberated and corrosive. For this reason, it is conceivable to use SUS329J4L, which has high corrosion resistance for the entire main tank as stainless steel, but this leads to an increase in cost.

  In view of the above-described circumstances, the present invention is capable of easily and quickly exhausting chlorine gas that is separated from water at the time of water discharge or is released from stored water and stays in the gas phase portion of the water receiving tank body. Thus, it is possible to reliably prevent corrosion of the top plate and the side plate facing the gas phase portion of the water receiving tank main body, to prevent the cost of the water receiving tank from rising, and to make the water receiving tank main body maintenance-free. It was made for the purpose of providing a water receiving tank.

  The water receiving tank according to claim 1 of the present invention has a gas phase in the water receiving tank body above the highest water level stored on the side plate of the water receiving tank body made of stainless steel having lower corrosion resistance to chlorine gas than SUS329J4L. A vent pipe is provided so that the portion communicates with the outside of the water receiving tank body.

  In the water receiving tank of claim 2 of the present invention, the vent pipes are respectively provided on opposing side plates of the water receiving tank main body, and in the water receiving tank of claim 3, the vent pipe is connected to the side plates. The hood having a vent pipe main body and a hood connected to the tip of the vent pipe main body and having an opening formed on the bottom side thereof is provided. In the water receiving tank of claim 4, an insect repellent net is provided at the opening of the hood. In the water receiving tank of claim 5, the vent pipe main body is formed in a downward slope toward the side away from the side plate of the water receiving tank main body.

  In the water receiving tank of claim 6, a water return plate is fixed in the middle of the axial direction in the vent pipe main body so as to be positioned on the bottom side of the vent pipe main body. In the water receiving tank of claim 7, On the bottom side of the vent pipe, drain holes are provided on both sides of the water return plate. In the water receiving tank of claim 8, an insect net is provided in the drain hole. In the water receiving tank of item 9, the insect repellent net provided in the drain hole is formed in a recessed concave shape, and a string-like object is suspended from the bottom of the concave part. The peripheral edge of the insect screen is fixed to the outer peripheral edge of the vent pipe body so that the insect screen provided in the drain hole is positioned below the drain hole. One side plate side provided with a vent pipe inside and another vent different from the vent pipe. A partition plate is provided inside so as to partition the other side plate side provided with the pipe, and the liquid level in the two water receiving tank main bodies in which the partitioned internal parts of the water receiving tank main body are separated from each other are divided. A communication pipe is provided so as to be at the same level, and the top plate of the water receiving tank main body is different from each of the vent pipes so that each gas phase section partitioned by the partition plate communicates with the outside of the water receiving tank main body. A separate vent pipe is provided.

  According to the water receiving tank described in claims 1 to 11 of the present invention, the outside air that has flowed into the gas phase part of the water receiving tank main body from the vent pipe provided on the side plate is accompanied by chlorine gas staying in the gas phase part. Because the air is exhausted to the outside from the ventilation pipe provided on the side plate or the ventilation pipe provided on the ceiling, ventilation is easy, quick and reliable, and corrosion of the top plate and the side plate in contact with the gas phase is good. As a result, stainless steel having a lower corrosion resistance than SUS329J4L can be used for the water receiving tank body, resulting in a lower manufacturing cost and water drops etc. from the vent pipe entering the water receiving tank body. Therefore, it is possible to store cleanly without contaminating the water in the water receiving tank body. Further, according to claim 9, the water droplets falling from the drain hole remove the string-like body from the insect repellent net. Because it is transmitted and dropped and discharged, Furthermore, according to the tenth aspect of the present invention, it is possible to reliably prevent the dust adhering to the peripheral portion of the insect screen from entering the water receiving tank main body. The water inside can be stored even more cleanly, the problem of dust being caught in the vent pipe can be avoided, and the insect screen can be easily cleaned and replaced.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 4 show a first example of an embodiment of the present invention. In the figure, the same reference numerals as those shown in FIG. 7 denote the same components. In the figure, 7 is a vent pipe, which is the highest water level H.V. It is connected to the upper part of the opposite side plates 1b of the water receiving tank body 1 so that the gas phase part 6 communicates with the outside of the water receiving tank body 1 at a position above L. Thus, a plurality of the vent pipes 7 are arranged along the surface of each side plate 1b in a direction orthogonal to the paper surface of FIG. Further, the water receiving tank main body 1 including the vent pipe 7 is all formed of SUS444 which is lower than SUS329J4L in corrosion resistance to chlorine gas.

  As shown in FIG. 2, the vent pipe 7 has a side plate 1 b side end portion that passes through the side plate 1 b and is slightly inserted into the water receiving tank main body 1, and is approximately 1/10 of the direction away from the side plate 1 b. A vent pipe main body 7a arranged in a downward slope is provided, and the top of the vent pipe main body 7a opposite to the side plate 1b is formed in an arc shape in a side view and an opening is formed in the bottom of the bottom. The hood 7b is flange-connected.

  A half-moon-shaped water return plate 7c whose top is horizontal when viewed from the front is fixed to the bottom surface of the vent pipe main body 7a in the middle of the axial direction, and there is a front and rear of the water return plate 7c at the bottom of the vent pipe main body 7a. Water drain holes 8a and 8b are formed.

  Flat insect repellent nets 9a and 9b are installed on the lower surfaces of the drain holes 8a and 8b, and an insect repellent net 10 bent in an arc along the outer periphery of the vent pipe main body 7a is formed in the lower opening of the hood 7b. is set up. The outer peripheral edge portions of the insect screens 9a and 9b are fixed to the outer peripheral lower surface of the vent pipe main body 7a, and the whole is located on the outer peripheral lower surface of the vent pipe main body 7a. The material of the insect screens 9a, 9b, 10 is also SUS444.

Next, the operation of the above embodiment will be described.
In the illustrated example, water W is supplied through a water supply pipe 2 by a water supply pump (not shown). At this time, chlorine gas is separated and generated from the water W discharged from the water supply pipe 2. In addition, a large amount of chlorine gas is released from the stored water W, particularly in the summer. For this reason, chlorine gas stays in the gas phase section 6 in the water receiving tank body 1.

  However, in this example of illustration, since the aeration pipe 7 is provided in the upper part of the water receiving tank body 1 so that the gas phase part 6 of the water receiving tank body 1 and the outside of the water receiving tank body 1 communicate with each other at all times. 1 The outside air is introduced into the gas phase portion 6 of the water receiving tank main body 1 from the ventilation pipe 7 provided on one side plate 1b, using the airflow that collides with the side plate 1b, such as the external wind. Thus, the outside air introduced into the gas phase section 6 is exhausted to the outside through the vent pipe 7 provided on the other side plate 1b accompanied by the chlorine gas staying in the gas phase section 6, and is ventilated. The air flow in the gas phase section 6 may be further exhausted from the existing hooded ventilation pipe 5 to increase the wind flow. Therefore, the gas phase section 6 of the water receiving tank body 1 is ventilated easily, quickly and reliably, and the chlorine gas in the gas phase section 6 can be diluted. Corrosion of the top plate 1a, the side plate 1b and the like can be satisfactorily prevented.

  For this reason, as a result of being able to manufacture the whole water-receiving tank main body 1 by SUS444 with a corrosion resistance with respect to chlorine gas lower than SUS329J4L as stainless steel, manufacturing cost becomes low. The overflow pipe 4 and the vent pipes 5 and 7 also use SUS444.

  Since the vent pipe body 7a of the vent pipe 7 is formed in a downward slope in the direction away from the side plate 1b, water droplets such as condensed water accumulated in the vent pipe body 7a of the vent pipe 7 are water return plates 7c. It flows to the side, is discharged to the outside through the drain hole 8a, and does not return into the water receiving tank body 1. The vent pipe 7 is provided with a hood 7b that is open only at the bottom, and a water return plate 7c is provided in the vent pipe main body 7a. Therefore, even if the outside is strong wind, the rain pipes the vent pipe 7 from the hood 7b side. The water that does not enter the interior of the water receiving tank body 1 through the water and enters the ventilation pipe body 7a is stopped by the water return plate 7c, and is quickly discharged to the outside from the drain hole 8b. The inclined portion formed in a downward slope toward the direction away from the side plate 1b on the inner peripheral side of the vent pipe main body 7a is not only the drainage of condensed water generated inside the water receiving tank main body 1 or the vent pipe main body 7a, It also has a function of quickly draining rain or the like that has entered the outside portion of the water return plate 7c in the vent pipe body 7a and trapped in the inclined portion. As a result, the water W in the water receiving tank body 1 can be stored cleanly without being contaminated. Moreover, since the insect repellent nets 9a and 9b are entirely located on the outer peripheral lower surface of the vent pipe main body 7a, it is possible to prevent dust accompanying the air flow from being caught in the vent pipe main body 7a. 9a and 9b can be easily cleaned and replaced.

  FIG. 5 is a second example of an embodiment for carrying out the present invention. The difference from the illustrated example is that the inner central part of the water receiving tank main body 1 is partitioned by the partition plate 11 and the water receiving tank main body 1 is left and right. In addition to being divided into two compartments, a point where the ventilation pipe 7 provided on the opposite side plate 1b is separated into two right and left compartments and a communication pipe 12 for communicating the divided right and left water receiving tank bodies 1 are provided. It is a point. The material of the water tank main body 1 and the vent pipe 7 as well as the material of the partition plate 11 and the communication pipe 12 are SUS444.

  In the illustrated example, the liquid level of the water W stored in the left and right water receiving tank main bodies 1 by the water supply from the water supply pipe 2 is at the same level because the communication pipe 12 is provided. In addition, according to the illustrated example, the outside air that has flowed into the gas phase portion 6 of the water receiving tank body 1 from the vent pipe 7 is exhausted to the outside through the vent pipe 5 along with the chlorine gas remaining in the gas phase section 6. . Thus, in the illustrated example as well, the inside of the gas phase part 6 can be ventilated easily, quickly and reliably and the chlorine gas can be exhausted. Corrosion of the top plate 1a, the side plate 1b, etc. of the water tank main body 1 can be satisfactorily prevented, and the entire water receiving tank main body 1 can be manufactured by SUS444 having a lower corrosion resistance than SUS329J4L, resulting in low manufacturing costs. Furthermore, since water droplets and the like do not enter the water receiving tank body 1 from the vent pipes 5 and 7, the water W in the water receiving tank body 1 can be stored cleanly without being contaminated.

  FIG. 6 shows another example of the insect net used in the drain holes 8a and 8b used by the vent pipe 7. The insect net 13 formed with a depression is fixed to the lower surface of the outer peripheral surface of the vent pipe main body 7a. A thin chain 14 is suspended from the center of the insect net 13. With such a configuration, the water droplets dropped from the drain holes 8a and 8b are dropped and discharged through the chain 14 from the insect screen 13 and can be drained more reliably. Further, since the entire insect screen 13 is located below the outer periphery of the vent pipe main body 7a, the dust accompanying the air current is caught in the vent pipe main body 7a as in the case shown in FIGS. In addition, the insect screen 13 can be easily cleaned and replaced. The material of the insect screen 13 and the chain 14 is also SUS444.

  The water receiving tank of the present invention is not limited to the above-described embodiment. For example, the hood 7b connected to the end of the vent pipe body 7a opposite to the side plate 1b is not a flange connection. A pipe welded with a joint may be welded to the vent pipe main body 7a, and the vent pipe main body 7a and the hood 7b may be screwed together, and the scope not departing from the gist of the present invention. Of course, various changes can be made.

It is a longitudinal cross-sectional view which shows the 1st example of embodiment of the water receiving tank of this invention. It is the II section expanded sectional view of FIG. It is a III-III direction arrow directional view of FIG. It is the IV section enlarged view of FIG. It is a longitudinal cross-sectional view which shows the 2nd example of embodiment of the water receiving tank of this invention. In the water receiving tank of this invention, it is an expanded sectional view which shows the other example of the insect net attached to the drain hole of a vent pipe main body. It is a longitudinal cross-sectional view which shows an example of the conventional water receiving tank.

Explanation of symbols

1 Water tank body 1a Top plate 1b Side plate 5 Vent pipe (another vent pipe)
6 Gas-phase part 7 Vent pipe 7a Vent pipe main body 7b Hood 7c Water return plate 8a Drain hole 8b Drain hole 9a Insect net 9b Insect net 10 Insect net 11 Partition plate 12 Communication pipe 13 Insect net 14 Chain (string)
W water H. L High water level

Claims (11)

  The gas phase part in the water receiving tank main body and the outside of the water receiving tank main body communicate with the side plate of the water receiving tank main body constituted by stainless steel having a lower corrosion resistance to chlorine gas than SUS329J4L above the maximum water level of the stored water. A water receiving tank provided with a vent pipe.   The said aeration pipe is a water receiving tank of Claim 1 provided in the side plate which a water receiving tank main body opposes, respectively.   3. The water receiving tank according to claim 1, wherein the vent pipe includes a vent pipe main body connected to a side plate, and a hood connected to a distal end of the vent pipe main body and having an opening formed on a bottom surface side.   The water receiving tank according to claim 3, wherein an insect screen is provided at an opening of the hood.   The said aeration pipe main body is a water receiving tank of Claim 3 currently formed in the downward slope toward the side which leaves | separates from the side plate of a water receiving tank main body.   The water receiving tank according to any one of claims 3 to 5, wherein a water return plate is fixed to an intermediate portion in the axial direction in the vent pipe main body so as to be positioned on the bottom side of the vent pipe main body.   The water receiving tank according to claim 6, wherein drain holes are provided on both sides of the water return plate on the bottom side of the vent pipe.   The water receiving tank according to claim 7, wherein an insect screen is provided in the drain hole.   The water receiving tank according to claim 8, wherein the insect repellent net provided in the drain hole is formed in a recessed concave shape, and a string-like object is suspended from the bottom of the concave portion.   The water receiving tank according to claim 8 or 9, wherein a peripheral part of the insect screen is fixed to an outer peripheral part of the main body of the vent pipe so that the insect screen provided in the drain hole is located at a lower part of the drain hole.   The water receiving tank body is provided with a partition plate inside so as to partition one side plate side provided with a vent pipe inside and the other side plate side provided with another vent pipe different from the vent pipe, In addition, a communication pipe is provided so that the liquid level in the two water receiving tank main bodies in which the partitioned interior of the water receiving tank main body communicates with each other is at the same level, and the top plate of the water receiving tank main body has a partition The water receiving tank according to any one of claims 1 to 10, further comprising another vent pipe different from each of the vent pipes so that each gas phase section partitioned by a plate communicates with the outside of the receiving tank main body.

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