JP2004026252A - Water storage tank having mechanism for controlling protective water for canopy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water storage tank which has a submersible type and floating type canopy and enables redundant water of a protective water layer to be efficiently discharged at a low cost by a simple structure. <P>SOLUTION: A part or the whole of the floating type canopy of the water storage tank 1 is composed of an impermeable flexible sheet 2, and the protective water layer is formed of the protective water 5 above the sheet 2. A counterweight 3 is provided in a prescribed position on the sheet 2, and a float 6, which floats on the water surface of the protective water 5, is connected to the counterweight 3 by a coupling material 8 such as a cord. When the quantity of the protective water 5 is increased by a rainfall and the like, the float 6 is pulled into the protective water 5 while the counterweight 3 is sunk down; the redundant water is discharged through an exhaust port 7 and a drain hose 9, which are provided in the float 6; and the quantity of the protective water 5 on the sheet 2 is maintained. Thus, a reduction in stored water 4 is prevented. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The invention of the present application is a submersible type in which a protective water layer is formed on the upper part of the floating type canopy to prevent deterioration of the canopy due to ultraviolet rays or the like and to prevent obstruction of the surface of the floating type canopy from rising and falling due to freezing in cold weather. The present invention relates to improvement of a water storage tank having a floating canopy.
[0002]
[Prior art]
According to the Nihon Agricultural Newspaper issued on May 10, 2002, a water tank equipped with a floating canopy developed by the inventors of the present application has a non-permeable flexible between the canopy body and the side wall of the water tank. By connecting with a canopy sheet and forming a protective water layer above the floating canopy, it prevents garbage from entering the water storage tank and prevents the occurrence of watercress and aquatic plants, and the protective water layer prevents material deterioration of the canopy A submersible water tank is described.
[0003]
[Problems to be solved by the invention]
The above-mentioned floating canopy is less costly than a conventional rigid canopy installed on the side wall of a water tank, and has no load on the water tank body, so it can be applied to existing water tanks. Has advantages.
[0004]
However, in the above-mentioned article, the problem to be solved is as follows: "If rain continues, the amount of water on the sheet will increase and the storage capacity will decrease, so work such as drainage will be required. Remains.
[0005]
In other words, if there is a protective water layer to prevent the canopy from deteriorating, if surplus water is generated in the protective water layer due to rainfall, etc. This will reduce the amount of water that can be stored.
[0006]
As a simple structure, it is conceivable to attach a pipe to a predetermined position of a canopy and connect it to a spillway position. However, it is difficult to discharge only surplus water in a protection water tank in relation to stored water. This is because the stored water and the water in the protective water layer are only separated by the sheet constituting the floating canopy, and the water pressure on the upper side of the sheet and the water pressure on the lower side are the same. In addition, it is difficult to adjust the water level of the protective water layer because of this.
[0007]
The invention of the present application is intended to solve the above-described problem when a submerged floating canopy is used, and for a water storage tank having a submerged floating canopy, the surplus water in the protective water layer can be simply reduced. It is an object of the present invention to provide a water tank that can be efficiently drained at a low cost with a structure.
[0008]
[Means for Solving the Problems]
The water storage tank according to claim 1 of the present application is configured such that a part or all of a floating type canopy which covers the stored water and can float on the stored water is formed of a non-permeable flexible sheet, and a canopy is provided above the floating type canopy. A protective water layer for protecting the sheet is formed, and a weight is provided at a predetermined position of the sheet so that tension is generated in the sheet in a state where the water is filled in the water storage tank, and By connecting the weight and the float provided with the drain with a connecting member of a predetermined length, and when the amount of water in the protective water layer increases more than a predetermined amount, the weight draws the float into the protective water layer. The surplus water in the protective water layer is discharged through a drain port of the float.
[0009]
The material of the sheet is not particularly limited as long as it is impermeable to water, and a synthetic resin material, a rubber material, or the like can be used. In short, it is only necessary that the floating canopy has a flexibility that is compatible with the vertical movement, and it may be flat or may be bent in a bellows shape.
[0010]
The weight is not particularly limited, but as a simple one, for example, an iron material such as an iron piece can be used. The connecting material for connecting the float with the drainage port to the weight is not particularly limited, but a string or a rope made of synthetic fiber or the like is sufficient if it has a necessary tensile strength, and a flexible and easy-to-handle material is desirable. .
[0011]
According to the first aspect of the present invention, when the amount of water in the protective water layer increases due to rain or the like while the required amount of water is stored in the water storage tank, the weight pulling the floating canopy downwards further lowers the weight. The float connected by the connecting material is drawn into the protective water layer while sinking in the water.
[0012]
At this time, tension associated with the sedimentation of the weight acts on the sheet of the floating canopy sandwiched between the stored water and the protective water layer, and the drain port provided on the float is connected to the spillway position with a hose or the like. By doing so, it is possible to efficiently discharge the surplus water of the protective water layer flowing into the drain of the float without reducing the stored water.
[0013]
In addition, when the water storage amount is constant, since the position of the weight is determined by the water amount of the protective water layer, the water level of the protective water layer can be set by setting the length of the connecting member, and particularly without using a monitoring device or the like. However, when excess water is generated due to rainfall or the like, the position of the weight at the bottom of the seat falls below a certain limit, so that the excess water can be automatically drained through the drain port of the float.
[0014]
Claim 2 is the water storage tank according to claim 1, wherein the floating canopy is formed of a water-impermeable canopy sheet provided with a float, and an outer peripheral portion of the canopy sheet is attached to a side wall of the water storage tank. Is limited.
[0015]
When the entire floating canopy is made of a water-impermeable sheet, for example, as described in the section of the prior art, a water tank described in the Nihon Agricultural Newspaper issued on May 10, 2002 may be used. In some cases, a non-permeable flexible sheet provided with a weight is attached to the upper end of a side wall of the water tank body, and a float is provided on the flexible sheet.
[0016]
Claim 3 is the water tank according to claim 1, wherein the floating type canopy is provided with a float or a canopy body itself constituting a float, an outer peripheral portion of the canopy main body, and an inner peripheral portion of a side wall of the reservoir. This is limited to the case of a water-impermeable canopy sheet that connects the sheets.
[0017]
In the case where a part of the floating canopy is formed of a non-permeable sheet, for example, as in a water storage tank described in JP-A-2002-12291, the main body part of the floating canopy is placed below the water surface in the water storage tank. In addition, there is an arrangement in which the side wall of the water storage tank and the canopy main body are connected by a flexible sheet while being arranged so as to be able to move up and down with the fluctuation of the water level.
[0018]
The water storage tank according to claim 4 of the present application is configured such that a part or all of a floating canopy that covers the stored water and can float on the stored water is formed of a non-permeable flexible sheet, and a canopy is provided above the floating canopy. A protective water layer for protecting the sheet is formed, and a heavy line is provided at a predetermined position of the sheet so that tension is generated in the sheet in a state where the storage water is filled in the water storage tank, and the sheet is protected. A float is floated on an aqueous layer and connected to the weight by a connecting member having a predetermined length. When the amount of water in the protective water layer increases to a predetermined value or more, a force acts on the weight to draw the float into the protective water layer. In this case, the drainage device provided in the protective water layer is activated, and the surplus water of the protective water is discharged through the drain port for the protective water.
[0019]
While the reservoir according to claim 1 does not particularly require a monitoring device or the like, it is also possible to detect the force for pulling the float as in claim 4 and to operate a drain pump or other drain device accordingly. Yes, the protection water can be automatically controlled with a relatively simple mechanism at low cost.
[0020]
The water reservoir according to claim 5, wherein a part or all of a floating type canopy that covers the stored water and can float on the stored water is formed of a non-permeable flexible sheet, and protects the canopy above the floating type canopy. A protective water layer is formed at the predetermined position of the sheet, and a tension is generated in the sheet in a state where the storage water is filled in the water storage tank. Judgment of whether the position of the weight is above or below the appropriate amount of water by detecting the rise and fall of the amount of protection water by electrical detection, optical detection (laser beam, etc.) or an electromagnetic sensor. As a criterion, there is provided a device for removing the protected water when the protected water is excessive, and for injecting the protected water when the protected water is insufficient.
[0021]
While claim 4 detects the pulling force, claim 5 performs the automatic control of the protection water by detecting the position of the weight.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a case in which the entire floating type canopy is formed of a flexible sheet 2 (corresponding to claim 2) as an embodiment of the present invention, but a part of the canopy is made of synthetic resin or rubber. The basic structure is the same when the outer peripheral portion and the side wall 1a of the water tank 1 are connected by a flexible sheet (corresponding to claim 3).
[0023]
FIG. 1A shows a process of pouring water into the water storage tank 1, that is, a state in which the amount of the stored water 4 is still insufficient, in which the sheet 2 is bent. Note that this example is a case where a predetermined amount of the protection water 5 is injected onto the sheet 2 before the storage of the storage water 4 is started.
[0024]
In the drawing, reference numeral 3 denotes a weight attached to a required position of the sheet, and when the storage water 4 is filled, the weight 3 faces downward on the sheet 2 as a canopy as shown in FIGS. 1 (b) and 1 (c). Give tension.
[0025]
Reference numeral 6 denotes a float having a drain port 7 on the upper portion, which is connected to the weight 3 by a connecting member 8 (a required tensile strength is sufficient, and a simple string-shaped one or the like may be used). At the other end of 7 is attached a drainage hose 9 for guiding the excess protection water 5 to the excess discharge position.
[0026]
FIG. 1B shows a normal state in which the water tank 1 is filled with water. When the position of the weight 4 and the amount of protection water 5 are balanced, the float 6 is positioned on the water surface of the protection water layer. are doing. In this state, the protection water 5 is not drained. The figure shows a state in which the amount of the protection water 5 is almost the maximum value in the normal state in the design, and the connecting member 8 is in a state of being completely extended. May be provided.
[0027]
FIG. 1C shows a state in which surplus water has been generated in the protective water layer due to rainfall or the like. When the protective water 5 increases, the weight 3 sinks downward and the float 6 protects the float 6. Pull in 5. In this state, surplus water flows into the drain port 7 provided in the float 6, and only the protection water 5 is efficiently drained through the drain hose 9.
[0028]
In addition, since the protection water 5 originally decreases due to transpiration and the like, it is not always necessary to rapidly drain surplus water, and the number and diameter of the drainage ports 7 may be designed according to a desired drainage speed.
[0029]
As the surplus water is drained, the float 6 gradually approaches the water surface due to the decrease of the protection water 5 and the rise of the weight 3, and returns to the state of FIG. 1 (b).
[0030]
FIG. 2 shows the results of a simulation of the water amount of the protective water layer and the deformation state of the floating canopy made of a flexible sheet with a weight, using a water tank model (30 cm in diameter). The sheet shape in a full state was plotted on the assumption that the average water depth of the protection water was 7 mm, 12 mm, and 17 mm in a state where the sheet was bent and positioned on the inner surface of the water storage tank.
[0031]
It should be noted that the position of the weight at the bottom of the seat is lowered as the amount of protection water is increased, and the present invention focuses on this point, and the position of the weight at the bottom of the seat is reduced to some extent. When this happens, the protection water is automatically drained. In addition, in the attached drawings, a water inlet, a water intake, a drain, etc. on the storage water side are omitted, but various forms used in conventional water storage tanks can be used. Is not particularly limited.
[0032]
【The invention's effect】
In the invention according to claim 1, when the amount of protection water of the submersible floating canopy increases due to rainfall or the like, the float with the drain connected to the weight is drawn into the protection water, thereby reducing the float. Only the surplus protection water is efficiently discharged from the drain, and the reduction of the stored water as in the past can be avoided.
[0033]
The amount of protection water can be easily adjusted by the arrangement of the weight and the float, the length of the connecting member, etc., and it is economical because no special monitoring equipment or drainage device is required.
[0034]
In addition, the mechanism is not only simple, but is basically maintenance-free, and in that respect, cost can be reduced.
[0035]
The invention according to claims 4 and 5 uses simple monitoring equipment and a drainage device as compared with the invention according to claim 1, but controls the amount of protection water efficiently with a relatively simple mechanism. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state in which a floating canopy is entirely formed of a flexible sheet as an embodiment of the present invention, and FIG. () Is a cross-sectional view in a normal state when the water tank is full, and (c) is a cross-sectional view showing a state of drainage when surplus water is generated in the protective water layer.
FIG. 2 is a diagram illustrating a simulation result of a relationship between a water amount of a protective water layer and a deformed state of a floating canopy formed of a flexible sheet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Reservoir main body, 1a ... Side wall, 2 ... Canopy, 3 ... Weight, 4 ... Reservoir, 5 ... Protective water, 6 ... Float, 7 ... Drain outlet, 8 ... Connecting material, 9 ... Drain hose

Claims (5)

Part or all of the floating canopy that covers the stored water and can float above the stored water is formed of a non-permeable flexible sheet, and a protective water layer for protecting the canopy is formed on the upper part of the floating canopy. Along with providing a weight at a predetermined position of the sheet, a tension is generated in the sheet in a state where the water is filled in the water storage tank, and the weight and a float having a drain port are provided. By connecting with a connecting member of a predetermined length, when the amount of water in the protective water layer is increased to a predetermined value or more, the weight pulls the float into the protective water layer, so that excess water in the protective water layer is removed from the float. A water tank characterized by being discharged through a drain. The water tank according to claim 1, wherein the floating canopy is made of a water-impermeable flexible canopy sheet provided with a float, and an outer peripheral portion of the canopy sheet is attached to a side wall of the water tank. The floating canopy comprises a canopy body provided with a float or itself constituting a float, and a water-impermeable flexible canopy sheet connecting an outer peripheral portion of the canopy main body and an inner peripheral portion of a side wall of the reservoir. The water tank according to 1. Part or all of the floating canopy that covers the stored water and can float above the stored water is formed of a non-permeable flexible sheet, and a protective water layer for protecting the canopy is formed on the upper part of the floating canopy. At the same time, a weight is provided at a predetermined position of the sheet so that tension is generated in the sheet in a state where the water is filled in the water storage tank, and a float floats on the protective water layer and the weight is fixed to the weight. When the water volume of the protective water layer increases more than a predetermined amount, the weight detects the force generated by the force of drawing the float into the protective water layer, and the protective water layer A water storage tank, wherein a drainage device provided in the inside of the storage tank works so that surplus water of the protection water is discharged through a drain port for the protection water. Part or all of the floating canopy that covers the stored water and can float above the stored water is formed of a non-permeable flexible sheet, and a protective water layer for protecting the canopy is formed on the upper part of the floating canopy. In addition, by providing a weight at a predetermined position of the sheet, tension is generated in the sheet in a state where the storage water is filled in the water storage tank, and the weight is moved up and down by the increase and decrease of the protection water amount. By using electrical, optical or electromagnetic sensors to determine whether the position of the weight is above or below the appropriate amount of water, it is used as a criterion. A water tank characterized by being equipped with a device for removing and injecting protection water when protection water is insufficient.

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