JP2001002183A - Condensed water drain structure for diaphragm tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condensed water drain structure for draining condensed water remaining on the upper face of a recess of a diaphragm to the outside of a tank or the lower section of the diaphragm. SOLUTION: A diaphragm tank is provided with a diaphragm 9 so cross spread as to part an air layer section 7A into the upper and the lower and provided in tension on the air layer section 7A above a storage liquid in the tank storing a liquid storing dissolved corrosive gas, and the tank is provided with an opening 11 running through a recess of the diaphragm 9, a pit 12 connected with the lower end of the opening 11 and also a drain pipe 13 running from the pit 12 to the outside of the tank through the inside of a lower air layer 7B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for discharging condensed water staying at an upper portion of a diaphragm stretched so as to vertically separate a gas layer of a tank storing a liquid in which corrosive gas is dissolved. .

[0002]

2. Description of the Related Art A steel or concrete tank for storing a liquid in which corrosive gas is dissolved, for example, tap water in which chlorine gas for sterilization is dissolved, raises and lowers a gas layer above the stored liquid in the tank. Japanese Patent Application No. 11-113145 and Japanese Patent Application No. Hei 11-113145, which are related to the present applicant, relate to a diaphragm tank in which a diaphragm which is transversely expanded so as to be partitioned is stretched.
There is an invention of 1-113148.

As an example of the prior art, the diaphragm tank of Japanese Patent Application No. 11-113145 of the present applicant will be described in detail with reference to FIG. As shown in FIG. 5, the diaphragm tank has a flat bottom wall 21, a cylindrical side wall 22 erected near the periphery thereof, a dome-shaped roof 23 covering the upper part thereof, and a vertically lower inner part. And a diaphragm 29 stretched so as to partition. The diaphragm 29 of the diaphragm tank has its peripheral edge attached to the mounting portion 2 on the inner surface of the tank side wall 22.
8, the gas layer 27 above the storage liquid 26 is divided into an upper gas layer 27A and a lower gas layer 27B.

As described above, the gas layer 27 is partitioned by the diaphragm 29 to prevent corrosive gas and vapor from the stored liquid 26 from entering the upper gas layer 27A, and the inner surfaces of the roof 23 and the side wall 22 are corroded. To prevent corrosion by volatile gases and vapors. The upper air layer 27A has an upper air vent 30A that communicates from the roof 23 to the atmosphere outside the tank.
The lower gas layer 27B is provided with a lower air vent 30B communicating from the side wall 22 to the atmosphere outside the tank, so that a load is not applied to the diaphragm 29 due to a pressure difference between the upper and lower gas layers 27A and 27B. . Reference numeral 24 denotes a roof frame made of a shaped steel material or the like that supports the roof 23, and reference numeral 25 denotes a roof slab made of a steel plate material that covers the upper portion.

[0005]

In the conventional diaphragm tank as shown in FIG. 5, water contained in the atmosphere enters the upper gas layer 27A from the upper air vent 30A, and the water inside the roof 23 and the side wall 22 is removed. There is a possibility that the cooling water is condensed and collected on the wall surface and the upper surface of the diaphragm 29 to form dew water 31 and stay on the upper surface of the concave portion of the diaphragm 29. As described above, the dew condensation water 31 staying on the upper surface of the concave portion of the diaphragm 29 in the upper gas layer portion 27A becomes large in a long period of time because it is blocked by the airtight diaphragm 29 and has no discharge destination. There is a concern that the load applied to the mounting member 29 and its mounting portion 28 may be increased, and the film material and its mounting member may be deteriorated and damaged.

Although the diaphragm 29 shown in FIG. 5 has been described as being extended in a catenary shape with a catenary curve, the flexible diaphragm tank of Japanese Patent Application No. 11-113148 of the present applicant has been described. As described above, in the case of a flexible membrane (not shown) in which the proper place of the diaphragm is supported on the tank roof, the dew condensation water stays in the concave portion formed between the supporting portions and the lowermost position in the same manner as described above. There was a fear.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a structure for discharging condensed water in a diaphragm tank for discharging the dew water remaining on the upper surface of the concave portion of the diaphragm to the outside of the tank or to the lower portion of the diaphragm. Is provided.

[0008]

According to the present invention, there is provided a diaphragm tank draining structure for dew condensation water, wherein a gas layer above a storage liquid of a tank for storing a liquid in which a corrosive gas is dissolved is placed up and down. A diaphragm tank having a diaphragm stretched transversely so as to be partitioned, comprising an opening penetrating through a concave portion of the diaphragm, a pit connected to a lower end of the opening, and passing through the lower gas layer from the pit. A drain pipe extending to the outside of the tank is provided, and the dew water generated in the upper gas layer of the diaphragm is collected in the pit from the opening and discharged to the outside of the tank by the discharge pipe.

Further, the dew condensation water discharging structure for a diaphragm tank according to the present invention is arranged so that a gas layer above a storage liquid of a tank for storing a liquid in which a corrosive gas is dissolved is transversely developed so as to partition the gas layer up and down. A diaphragm tank having a diaphragm stretched therein, comprising an opening penetrating a concave portion of the diaphragm, a pit connected to a lower end of the opening, and a backflow prevention structure communicating from the pit to a lower gas layer portion. Provide a discharge valve,
The condensed water generated in the upper gas layer of the diaphragm is collected in the pit from the opening and discharged from the discharge valve to the lower gas layer.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a structure for discharging condensed water of a diaphragm tank according to the present invention will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the tank body of the diaphragm tank has a bottom wall 1 formed of a circular flat plate material in which thin steel plates are arranged and welded and joined. A steel roof frame 4 is formed by erecting and connecting a cylindrical side wall 2 to an upper end portion of the side wall 2 and formed of a shape steel material or the like.
A dome-shaped roof 3 is provided from a steel sheet roof plate 5 stretched on the roof bone 4 and the storage liquid 6 in the tank.
Gas layer 7 formed above the highest liquid level of
Are laterally expanded so as to partition vertically, and the periphery is joined to a mounting portion 8 fixed to the inner surface of the side wall 2 to form a diaphragm 9 stretched in a catenary shape.

The upper gas layer 7A of the gas layer 7 partitioned by the diaphragm 9 is provided with an upper air vent 1 provided through the roof 3.
It communicates with the outside atmosphere by 0A. In addition, the diaphragm 9
The lower gas layer portion 7B of the gas layer portion 7 partitioned by the above is communicated with the outside atmosphere by a lower air vent 10B provided through the side wall 2.

The components of the diaphragm tank will be described in detail. The diaphragm 9 provided so as to partition the gas layer portion 7 in the tank up and down is formed of a sheet body having airtightness, toughness, and high corrosion resistance, for example, a metal sheet body, or a synthetic resin material such as a vinyl chloride resin. A sheet material of a synthetic resin film material or a cloth film material in which fibers such as polyester fiber and glass fiber are coated with a synthetic resin such as vinyl chloride resin is used.

A portion of the tank main body which is in direct contact with the storage liquid 6 such as tap water, that is, the side wall 2 and the bottom wall 1 below the highest liquid level of the storage liquid 6 are made of stainless steel plate made of corrosion-resistant steel. A portion of the lower gas layer portion 7B which is used and is in contact with corrosive gas such as chlorine gas released from the storage liquid 6 such as tap water, which is partitioned by the diaphragm 9;
In other words, the side wall 2 above the highest liquid level of the storage liquid 6 and below the mounting portion 8 of the side wall 2 to which the diaphragm 9 is connected is made of a stainless steel plate made of a high corrosion resistant steel having further excellent corrosion resistance. .

And is partitioned by the diaphragm 9;
A portion of the upper gas layer 7A where corrosive gas such as chlorine gas released from the storage liquid 6 such as tap water does not come into contact, that is, a portion of the side wall 2 and the roof 3 above the attachment portion 8 to the side wall 2 of the diaphragm 9. Uses ordinary and economical ordinary steel and weather-resistant steel.

In the diaphragm tank shown in FIGS. 1 and 2, the moisture in the atmosphere entering from the upper air vent 10A into the upper gas layer 7A partitioned by the diaphragm 9 is lower than the dew point in the upper gas layer 7A. The condensed water becomes condensed water 31 and collects on the upper surface of the concave portion located at the lowermost portion of the diaphragm 9 and stays. Therefore, in order to prevent the accumulated dew water 31 from deteriorating and damaging the membrane body and the mounting portion thereof, a dew water drain structure described in detail below is provided in the concave portion located at the lowermost portion of the diaphragm 9. Then, the remaining dew condensation water 31 is discharged and removed to the outside of the tank or the lower part of the diaphragm 9.

FIG. 1 shows an embodiment of a condensed water discharge structure according to the present invention, in which an opening 11 penetrates a concave portion located at the lowermost portion of a diaphragm 9 and is connected to a lower portion of the opening 11. And a discharge pipe 13 provided to discharge the condensed water 31 to the outside of the tank from the bottom of the pit 12 to the outside of the tank side wall 2 through the lower gas layer 7B.
And formed from It is not necessary to attach a special valve body or the like to the discharge pipe 13, and for example, a lightweight pipe material having corrosion resistance such as a hard vinyl chloride pipe or a polyethylene pipe is used.

In the condensed water discharge structure shown in FIG. 1, the condensed water 31 condensed in the upper gas layer 7A enters the pit 12 from the opening 11 provided in the lowermost concave portion of the diaphragm 9, and gathers. Drain water is discharged to the outside of the tank by the discharge pipe 13. As described above, the dew condensation water 31 is discharged from the discharge pipe 13.
As a result, the stored liquid 6 such as tap water is not contaminated by the condensed water 31. Since the discharge pipe 13 does not pass through the storage liquid 6, the storage liquid 6 is not contaminated by passing through the discharge pipe 13, and since the storage liquid 6 does not enter the discharge pipe 13, the dew condensation water 31 is not formed. No worry about mixing with
And since this discharge pipe 13 passes through the inside of the lower gas layer part 7B and also receives a heat retaining effect, there is no fear of freezing, and an inspection window for inspection is provided on the side wall 2 of the lower gas layer part 7B. The inspection of the discharge pipe 13 can be easily performed from the viewing window, and the maintenance can be performed by pulling out the discharge pipe 13 from the viewing window.

FIG. 2 shows another embodiment of the condensed water discharge structure of the diaphragm tank according to the present invention. The condensed water discharge structure includes an opening 11 penetrating the diaphragm 9, an opening 11 penetrating the diaphragm 9, a concave portion located at a lowermost portion where the condensed water 31 condensed in the upper upper gas layer portion 7 </ b> A partitioned by the diaphragm 9. 1
A pit 12 connected below the pit 12 is provided, and at the bottom of the pit 12, a discharge valve 14 having a backflow prevention structure for directly discharging the gas to the lower gas layer 7B at the shortest distance is provided.

In the condensed water discharge structure shown in FIG. 2, the condensed water 31 condensed in the upper gas layer portion 7A enters the pit 12 from the opening 11 provided in the concave portion at the lowermost position of the diaphragm 9 and collects. Is discharged from the discharge valve 14 to the lower gas layer 7 </ b> B immediately below and mixed into the stored liquid 6. This discharge valve 14
The corrosive gas contained in the lower gas layer 7B is supplied to the upper gas layer above the diaphragm 9 in a backflow prevention structure of a type in which the dew condensation water 31 flows freely downward but not in the opposite direction. The backflow is prevented from flowing into the section 7A. In addition, this dew-condensed water discharge structure stores a liquid that does not cause a problem even if the dew water 31 is mixed into the stored liquid 6, for example, a stored liquid 6 such as agricultural water containing corrosive gas such as pesticides and insect repellents. Suitable for farm pounds etc.

Referring to FIG. 3, a specific structure of the condensed water discharge structure shown in FIG. 1 will be described. The opening 11 is a circular or polygonal through-hole, and its periphery is reinforced by edging or the like, and a pit 12 is fixed below the opening. This pit 12
For example, a synthetic resin material such as fiber reinforced plastic, or formed in a box shape using stainless steel material, or the same material as the film body, for example, metal, a sheet body such as a vinyl chloride resin, or It is formed in a cylindrical shape with a bottom using a cloth material or the like in which polyvinyl chloride resin is coated on a polyester fiber or the like. A pipe inlet 16 is provided at the bottom of the pit 12,
A discharge pipe 13 is provided from the pipe inlet 16 to the outside of the tank through the lower gas layer portion 7B at a gentle gradient.

The discharge pipe 13 is made of, for example, a synthetic resin material such as hard vinyl chloride or polyethylene, or a hard pipe having corrosion resistance such as lining steel material or stainless steel material. Hanging support. Further, if a flexible tube or a flexible tube having another structure is provided at an appropriate position of the hard tube, the discharge tube 1
3 can cope with a displacement load without restricting the movement of the third member, thereby improving durability. The support member 15 is formed by joining a flat strip tab to the lower surface of the diaphragm 9 by welding or sewing, for example.
Then, for example, a flat band ring is wound, and a flexible connecting member such as a rope or a band is suspended and supported between the tab and the ring.

Since the discharge pipe 13 suspended and supported by the support member 15 does not pass through the storage liquid 6,
Since there is no change in load such as buoyancy and liquid pressure received from the stored liquid 6, a large load is not applied to the mounting portion at the bottom of the pit 12 and no damage is caused. Further, even when the diaphragm 9 moves up and down due to the taking in and out of the storage liquid 6, the discharge pipe 13 suspended and supported by the flexible connecting member can easily follow the displacement.

In the dew water discharge structure formed as described above, the dew water 31 collected in the pit 12 is discharged from the pipe inlet 16.
, Flows down naturally in the discharge pipe 13 by gravity, and is discharged and removed to the outside of the tank as drain water. Therefore, since the dew condensation water 31 does not mix into the storage liquid 6 in the tank, a structure suitable for a storage tank for storing the storage liquid 6 such as tap water in which the mixing of the dew condensation water 31 is not preferable.

When the dry state in the upper gas layer 7A above the diaphragm 9 is to be maintained more satisfactorily or in a gas environment which is not corroded further, the outlet of the discharge pipe 13 is provided with dry air. If a device (not shown) for supplying gas or inert gas is connected and dry air or inert gas is introduced into the upper gas layer 7A, the condensed water is volatilized and the generation of condensed water is prevented. It is also possible to do.

Referring to FIG. 4, the structure for discharging the condensed water shown in FIG. 2 will be described in detail. The bottom of the pit 12 connected to the lower part of the opening 11 of the diaphragm 9 is opened, and a discharge valve 14 in the form of a float check valve is mounted. The discharge valve 14 includes a float 17 that floats by the dew water 31, a cylindrical float chamber 19 that accommodates the float 17 in a loose fit,
Valve inlet 18 opening to pit 12 above float chamber 19
And a valve outlet 20 opened in the lower gas layer below the float chamber 19 and opened and closed by the float 17. A substantially vertical short pipe may be connected to the lower part of the valve outlet 20 (not shown) so as to extend to near the water surface of the stored liquid.

The float 17 is formed into a sphere floating on water using a stainless steel material, a rubber material, or the like, and floats by receiving buoyancy from the dew condensation water 31 inside the float chamber 19 and when there is no dew condensation water 31. The float 17 descends by its own weight, and the valve outlet 20 at the lower part of the float chamber 19 is floated.
To open and close. At the upper end of the valve outlet 20 of the float chamber 19, a packing made of synthetic rubber or the like is provided on a peripheral circular flange, and is formed so as to be tightly sealed with the packing by the pressing force of the float 17 by its own weight. The valve inlet 18 above the float chamber 19 is
The float 17 is formed in a circular or polygonal shape having a size that does not come out, and is provided with a wire net or the like so that coarse dust or the like does not enter the float chamber 19. If the float 17 has a shape in which a rod-shaped guide is provided vertically below the center of the float 17 and the guide is extended into the valve outlet 20, the float 17 is separated from the float chamber 19 when the float 17 floats. Leaving is suppressed, and the float 17 easily returns to the position of the valve outlet 20 after the dew condensation water 31 flows out.

In the above described structure for discharging the condensed water, the condensed water 31 on the diaphragm 9 collects in the pit 12 and stays in the float chamber 19 below the pit 12 to float the float 17 by buoyancy. In order to open 20, the dew water 31 is discharged into the lower gas layer 7 </ b> B below the diaphragm 9 and mixed with the stored liquid. And the condensation water 31
Is discharged, the valve outlet 20 is closed by the weight of the float 17. Since the valve outlet 20 is closed by the weight of the float 17 in this manner, the corrosive gas in the lower gas layer 7B does not flow back into the upper gas layer 7A.

The embodiment shown in FIG. 1 and FIG.
The case where the diaphragm 9 is stretched in the catenary shape of the catenary curve has been described. However, in the case of a flexible membrane body (not shown) in which a suitable place of the diaphragm is suspended and supported on the tank roof (not shown), A suitable number of drain valves having the same dew-water discharge structure as described above, for example, a simple structure as illustrated in FIG. Then, the dew water remaining on the upper surfaces of the plurality of concave portions of the flexible membrane is discharged from each position to the lower gas layer and mixed into the stored liquid. Alternatively, a plurality of concave portions of the diaphragm are opened, and each conduit is connected to a lower portion,
Each of these conduits is collected in a pit provided at the lowest position of the diaphragm, and a dew water discharge structure similar to the above, for example, a discharge pipe leading to the outside of the tank as illustrated in FIG.
The condensed water remaining on the upper surfaces of the plurality of concave portions of the flexible membrane is collected at one location and then discharged to the outside of the tank.

The embodiment shown in the figure is an example of a cylindrical diaphragm tank made of a dome roof type steel. FIG. 1 is suitable for a diaphragm tank for storing a storage liquid 6 such as tap water, and FIG. Although the dew water discharge structure is used, the same dew water discharge structure can be applied to a diaphragm tank storing a liquid in which another corrosive gas such as dilute sulfuric acid is dissolved. Further, the same dew-water discharge structure as described above may be applied to a diaphragm tank having a conical roof shape or a diaphragm tank in which at least a part of a component is formed of another component such as a concrete structure. Can be.

[0031]

As is apparent from the above description, an opening penetrating the concave portion of the diaphragm stretched so as to partition the gas layer above the storage liquid up and down, and a pit connected to the lower end of the opening are provided. In addition, the dew condensation water discharge structure of the diaphragm tank formed by providing a discharge pipe extending from the pit to the outside of the tank through the lower gas layer portion, the dew water generated in the upper gas layer portion of the diaphragm is easily drained by the natural flow of the tank. It can be discharged and removed to the outside. Therefore, while being able to prevent damage to the suspended diaphragm, the upper gas layer in the tank is
As dew condensation water is removed and dry state is kept well,
Corrosion of the roof and the inner wall surface of the side wall can be prevented.

Further, since the dew water is discharged to the outside of the tank and does not mix into the stored liquid in the tank, the stored liquid is not contaminated by the dew water and good quality can be maintained. In addition, since the discharge pipe is not immersed in the storage liquid, the load and discharge of the storage liquid do not cause a load variation in the discharge pipe, and therefore, there is no risk of damaging the mounting portion and the support portion of the discharge pipe.

Further, an opening is formed through the concave portion of the diaphragm, which is stretched so as to partition the gas layer above the stored liquid up and down, and a pit is provided at the lower end of the opening. In the case of the dew condensation water discharge structure of the diaphragm tank formed by providing a backflow prevention structure discharge valve that leads to
Condensed water generated in the upper gas layer of the diaphragm is discharged directly from the discharge valve to the lower gas layer and in the shortest distance into the stored liquid, so that the condensed water can be easily discharged and removed with good responsiveness. . As described above, since the dew condensation water is removed and the dry state is maintained in the upper gas layer in the tank, and there is no backflow of corrosive gas in the lower gas layer, corrosion occurs on the roof and the inner wall surface of the side wall. There is no.

Also, the dew water is discharged from the discharge valve immediately downward without accumulating in the pit in a large amount. This discharge valve is also simple in structure and light in weight, so that the load bearing on the diaphragm and its mounting part is reduced. And there is no fear that the film material and its mounting member are deteriorated and damaged.

[0035]

[Brief description of the drawings]

FIG. 1 is an explanatory side cross-sectional view of an embodiment of a condensed water discharge structure of a diaphragm tank according to the present invention, with a part thereof being omitted;

FIG. 2 is an explanatory side cross-sectional view of another embodiment of a dew condensation water discharge structure for a diaphragm tank according to the present invention, with a part thereof being omitted;

FIG. 3 is an explanatory side cross-sectional view of the dew condensation water discharge structure of FIG.

FIG. 4 is an explanatory side cross-sectional view of the dew condensation water discharge structure of FIG.

FIG. 5 is an explanatory side sectional view showing an example of a conventional diaphragm tank.

[Explanation of symbols]

1 bottom wall 2 side wall 3
Roof 4 Roof bone 5 Roof panel 6
Stored liquid 7 Gas layer 7A Upper gas layer 7
B lower air layer part 8 mounting part 9 diaphragm 10A upper air vent 10B lower air vent 11 opening 12 pit 1
3 Discharge pipe 14 Discharge valve 15 Support material 1
6 Pipe inlet 17 Float 18 Valve inlet 1
9 Float chamber 20 Valve outlet 21 Bottom wall 22 Side wall 2
3 Roof 24 Roof bone 25 Roof 2
6 Stored liquid 27 Gas layer 27A Upper gas layer 2
7B Lower air layer part 28 Attachment part 29 Diaphragm 30A Upper air vent 30B Lower air vent 31 Condensation water

Claims (2)

[Claims] 1. A diaphragm tank comprising a gas layer above a stored liquid of a tank for storing a liquid in which a corrosive gas is dissolved, and a diaphragm which is laterally expanded so as to partition the gas layer vertically. A diaphragm tank provided with an opening penetrating through a concave portion of the diaphragm, a pit connected to a lower end of the opening, and a discharge pipe extending from the pit to the outside of the tank through the lower gas layer portion. Condensate discharge structure. 2. A diaphragm tank in which a gas layer above a stored liquid in a tank for storing a liquid in which a corrosive gas is dissolved is provided with a diaphragm which is laterally expanded so as to partition the gas layer vertically. An opening penetrating the concave portion of the diaphragm, a pit connected to the lower end of the opening is provided, and a discharge valve having a backflow prevention structure communicating from the pit to the lower gas layer is provided. Condensation water discharge structure.