JPH0563391B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a water storage tank.

(Prior Art) Conventionally, tanks made of iron or synthetic resin have been used as water storage tanks. However, from the viewpoint of hygiene, fire resistance, and earthquake resistance, stainless steel tanks are increasingly being used these days. However, when tap water is supplied into a water storage tank, the sterilizing chlorine contained in the water is liberated and gasified as the water is released, and the chlorine gas is released into the space above the water level in the tank. Floating in the air. On the other hand, dew condensation occurs due to the temperature difference between the inside and outside of the air section in the tank, and therefore the chlorine gas is easily dissolved in the water droplets.

Then, the water droplets evaporate due to a rise in outside temperature, etc., and as water is repeatedly discharged, chlorine gas is continuously dissolved in the water droplets, and the chlorine in the water droplets is gradually concentrated. As a result, the water droplets exhibit an oxidizing effect, and the water storage tank corrodes even though it is made of stainless steel. In particular, in recent years, as the water quality of tap water has deteriorated, the amount of dissolved chlorine for sterilization has increased, so such corrosion has become even more noticeable.

Therefore, in order to prevent corrosion of the tank body itself, it has been proposed that, for example, an auxiliary tank is provided above the tank body, and each tank is provided with a water supply pipe and a water level adjustment device (in practice). Kimiaki
56-17583).

In this water storage tank, water is first supplied from a water supply pipe connected to the tank body. Then, when the water level inside the tank reaches a predetermined level,
A water level adjustment device provided in the tank body is activated to stop the water supply. Subsequently, water is supplied from the water supply pipe connected to the auxiliary tank,
The tank main body is filled with water, and then water is supplied to the auxiliary tank. Then, when the water level in the auxiliary tank reaches a predetermined water level, the water level adjustment device is activated and water supply from the water supply pipe is stopped.

(Problems to be Solved by the Invention) However, in the conventional water storage tank, the water supply pipes connected to the tank body and the auxiliary tank are formed to have approximately the same diameter. In this case, if both water supply pipes are made large in diameter, the amount of water supplied per unit time will increase, and water can be supplied to the tank body in a short time, but water cannot be supplied to the auxiliary tank, which is smaller than the tank body. It is difficult to maintain the water level at a predetermined level. Further, if both water supply pipes are made small in diameter, the amount of water supplied per unit time will be reduced, and although it becomes easier to supply water into the auxiliary tank, there is a problem in that it takes time to supply water into the tank body.

In addition, since the conventional water storage tank has a structure in which the tank main body and the auxiliary tank are each provided with a water supply pipe and a water level adjustment device, each water supply pipe and each water level adjustment device in the tank main body and the auxiliary tank are provided. are far apart from each other,
It is difficult to maintain and inspect them.

Furthermore, since the outlet of the water supply pipe connected to the tank body is always located within the stored water, there is a risk that the water in the tank will flow back into the water supply pipe due to a siphon effect, so measures are required to prevent this backflow. There was a problem in that it had to be provided separately.

Structure of the Invention (Means for Solving the Problems) The present invention has been made in order to solve the above problems, and the water storage tank of the first invention has a smaller size than the upper part of the tank body. The auxiliary tank is formed to communicate with the inside of the tank main body,
An auxiliary water supply pipe is introduced into the auxiliary tank, and the auxiliary water supply pipe is equipped with an upper water level adjustment device that stops water supply when the water level in the auxiliary tank reaches the upper fixed water level, and resumes water supply when the water level in the auxiliary tank reaches the fixed upper water level. At the same time, a main water supply pipe was introduced into the auxiliary tank, and the main water supply pipe was equipped with a lower water level adjustment device that stopped water supply when the water level reached the lower fixed water level and resumed water supply when the water level was lower than that. In a water storage tank, the top plate of the tank body is formed in an oblique shape so that the outer and inner surfaces are higher toward the center,
The auxiliary tank is provided in the center thereof, and
The auxiliary water supply pipe has a small diameter that supplies a small amount of water per unit time, and the main water supply pipe has a large diameter that is introduced into the tank body through the interior of the auxiliary tank and that can supply a large amount of water per unit time. This water storage tank is further characterized in that a main valve for opening and closing the main water supply pipe by the lower water level adjusting device is provided outside the auxiliary tank.

In addition to the structure of the first invention, the second invention includes:
In addition to leading the main water supply pipe introduced into the auxiliary tank to the tank body side, the main water supply pipe inside the auxiliary tank is
A siphon-breaking communication section was installed to communicate the inside of the main water supply pipe with the space above the upper constant water level of the auxiliary tank, and to prevent the water in the tank from flowing back into the main water supply pipe due to siphon development. This is a water storage tank with the following points in mind.

(Function) By employing the above configuration, in the first invention, when the water level in the water storage tank is below the lower constant water level, the lower water level adjustment device is activated, the main valve is opened, and water is supplied from the main water supply pipe. be exposed. At this time, since the main water supply pipe is formed in a large diameter shape that can supply a large amount of water per unit time, it is possible to fill the tank body in a short time. When the water level reaches the lower constant water level, the lower water level adjusting device is activated, the main valve is closed, and water supply from the main water pipe is stopped.

Further, when the water level in the auxiliary tank is higher than the lower constant water level and below the upper constant water level, the upper water level adjustment device is activated and water is supplied from the auxiliary water supply pipe.
At this time, since the auxiliary water supply pipe is formed in a small diameter shape that supplies a small amount of water per unit time, it is possible to efficiently supply water up to the upper constant water level in the auxiliary tank. Then, when the water level reaches the upper constant water level, the upper water level adjustment device is activated and water supply from the sub-water pipe is stopped.

By the way, the main water pipe, the lower water level adjustment device,
Both the auxiliary water supply pipe and the upper water level adjustment device are installed in the auxiliary tank, and the main valve for opening and closing the main water supply pipe is installed outside the main tank, making maintenance and inspection of these easy. It becomes possible to do so. Furthermore, since the top plate is slanted, air pockets do not occur in this area, and corrosion from this area is prevented.

Further, in the second invention, the main water supply pipe in the auxiliary tank is provided with a siphon-breaking communication part that communicates the inside of the main water supply pipe with the space above the upper fixed water level of the auxiliary tank, so that the effect of the first invention is achieved. In addition, the siphon effect prevents water in the tank from flowing back into the main water supply pipe.

(Example) An example embodying the present invention will be described below with reference to the drawings.

The top plate 2 of the tank body 1 in which water is stored is formed in an oblique shape so that the outer and inner surfaces are higher toward the center, and an auxiliary tank 3 smaller than the tank body 1 is provided at the center. ing. The lower part of this auxiliary tank 3 communicates with the inside of the tank body 1.

The upper plate 4 of the auxiliary tank 3 is provided with a vent pipe 5 opening to the outside and a manhole 6 having a lid 6a. Further, a main water supply pipe 7 for supplying water to the inside of the tank body 1 is connected to one side plate of the auxiliary tank 3. This main water supply pipe 7 is formed in a large diameter shape that can supply a large amount of water per unit time. The main water supply pipe 7 is introduced into the auxiliary tank 3, extends parallel to the upper plate 4 of the auxiliary tank 3 to near the opposite side plate, and is bent downward, so that its lower end opening is located inside the tank body 1. The water is guided below the lower constant water level A, which is the lower limit water level.

Furthermore, in the bent portion of the main water supply pipe 7 in the auxiliary tank 3, a plurality of through holes 7a are provided as siphon breaking communication portions in a portion corresponding to the inner surface of the auxiliary tank 3. Therefore, these through holes 7a allow connection between the inside of the main water supply pipe 7 and the auxiliary tank 3.
The tank will communicate with the space above the upper constant water level, which is the upper limit water level of
It is possible to discharge the water that has flowed back through the through hole 7a. Further, when water is supplied from the main water supply pipe 7, the water pressure can cause water to be ejected from the through hole 7a onto the inner surface of the auxiliary tank 3. An overflow pipe 12 is connected to a side plate of the auxiliary tank 3 that faces the side plate to which the main water supply pipe 7 is connected.

The main water supply pipe 7 is provided with a main positioning water level valve 8 as a lower water level adjusting device. This main fixed water level valve 8 includes a main valve 8a installed in the main water supply pipe 7 outside the auxiliary tank 3, a bypass pipe 9 extending from the main valve 8a and introduced into the auxiliary tank 3 from above,
It consists of a child valve 8b provided at the outlet at the inner end of the bypass pipe 9, and a ball tap 8c attached to the child valve 8b. The bypass pipe 9
The discharge port is located above the upper normal water level.

The ball tap 8c is connected to the tank body 1.
If the water level inside is lower than the lower constant water level A, the child valve 8b
and 8a are opened to allow water to be supplied from the bypass pipe 9 and the main water supply pipe 7. Further, when the water level reaches the lower constant water level A, the ball tap 8c closes the child valve 8b to stop the water supply from the bypass pipe 9, and also closes the main valve 8a based on the operation of the small valve 8b to close the main valve 8a. The water supply from the water supply pipe 7 is stopped.

Further, in the main water supply pipe 7, at a position closer to the water source (on the right side in the figure) than the main valve 8a, there is a sub water supply pipe 10 formed in a small diameter shape that supplies less water per unit time than the main water supply pipe 7. is connected. This auxiliary water supply pipe 10 is introduced into the auxiliary tank 3 by detouring above the auxiliary tank 3, and the discharge port at the inner end thereof is opened above the above-mentioned upper constant water level.

A sub-positioning water level valve 11 as an upper water level adjusting device is provided at the outlet of the sub-water supply pipe 10, and a ball tap 11a is attached to the sub-positioning water level valve 11. And the ball tap 11a
When the water level in the auxiliary tank 3 is below the upper fixed water level B, the sub-regular water level valve 11 is opened to supply water from the auxiliary water supply pipe 10, and when the water level reaches the upper fixed water level B, the sub-regular water level valve 11 is opened. 11 is closed to stop water supply from the auxiliary water supply pipe 10.

Next, the operation and effect of this embodiment configured as described above will be explained.

When the water level in the tank body 1 is below the lower constant water level A, the main valve 8a is opened based on the operation of the child valve 8b, and water is supplied from the main water supply pipe 7. Since this main water supply pipe 7 is formed in a large diameter shape that can supply a large amount of water per unit time, it is possible to fill the tank body 1 with water in a short time. The main water supply pipe 7 in the auxiliary tank 3 is provided with a plurality of through holes 7a, so when water is supplied from the main supply pipe 7, the water pressure causes water to flow from the through holes 7a against the inner surface of the auxiliary tank 3. Water gushes out. Therefore, the inner surface of the auxiliary tank 3 is cleaned by this jet of water and corrosion is prevented. Then, the water level is the lower constant water level A
When the water temperature reaches this point, the main valve 8a is closed and the water supply from the main water supply pipe 7 is stopped.

When the water level in the auxiliary tank 3 is higher than the lower constant water level A and below the upper constant water level B, the auxiliary constant water level valve 11 is opened and water is supplied from the auxiliary water supply pipe 10. Since the auxiliary water supply pipe 10 is formed to have a smaller diameter so that the amount of water supplied per unit time is smaller than that of the main water supply pipe 7, water is supplied little by little. and,
When the water level in the auxiliary tank 3 reaches the upper fixed water level B, the auxiliary fixed water level valve 11 is closed and the auxiliary water supply pipe 1
Water supply from 0 is stopped.

By the way, in this embodiment, the main water supply pipe 7 is immersed in the water stored in the tank body 1, so when the water supply is stopped, the stored water flows into the main water pipe 7 due to the siphon phenomenon.
Backflow inside. However, at the bent portion of the main water supply pipe 7 in the auxiliary tank 3, a plurality of transparent lights 7a are provided that communicate the inside of the main water supply pipe 7 with the space above the upper constant water level B of the auxiliary tank 3. Therefore, the water that has flowed back is discharged into the space from these through holes 7a. In addition, since the discharge ports of the sub-water supply pipe 10 and the bypass pipe 9 are constructed so as not to be submerged under the water surface, no backflow occurs in these. Therefore, in this embodiment, there is no need to provide a backflow prevention device such as a backflow prevention valve or a vacuum breaker, unlike in the conventional case.

Further, in the water storage tank of this embodiment, the main water supply pipe 7, the sub water supply pipe 10, the main fixed water level valve 8, and the sub fixed water level valve 11 are provided concentrated in the auxiliary tank 3, and moreover, the main water supply pipe 7 is Since the main valve 8a for opening and closing is provided outside the auxiliary tank 3, these valves are close to each other, making maintenance and inspection easy.

Furthermore, when the main positioning water level valve 8 is used alone, there is a delay of several seconds to several tens of seconds from when the child valve 8b closes until the main valve 8a closes, so overflow may occur. Therefore, in order to avoid the above-mentioned overflow, it is necessary to use a large auxiliary tank in consideration of this, but in this embodiment, it has a two-stage configuration of the main fixed water level valve 8 and the sub fixed water level valve 11. The water level can be easily adjusted, and there is no need to worry about overflow, unlike in the past, and the auxiliary tank 3 can be small. Therefore, the number of parts used per effective amount of water is reduced, making it possible to reduce costs.

In addition, if a water storage tank has a flat top plate, air will accumulate in the tank body due to the condition of the foundation, welding distortion, etc., making this part prone to corrosion, but in this embodiment, the inner surface of the top plate 2 is
Since the air is slanted towards the auxiliary tank 3
It is discharged to the outside from the ventilation pipe 5 through the vent pipe 5. Therefore, no air pockets are generated in the tank body 1, and corrosion of the top plate 2 of the tank body 1 is prevented.

In this embodiment, the outer surface of the top plate 2 is also formed in a slanted shape, so that when this water storage tank is installed outdoors, rainwater can quickly flow downward.

The present invention is not limited to the above-mentioned embodiment, and for example, by providing a ventilation fan to the auxiliary tank 3, the free gasified chlorine gas in the auxiliary tank 3 can be forcibly discharged to the outside of the auxiliary tank. Good too. By doing so, the free gasified chlorine gas that has an adverse effect on the auxiliary tank 3 is quickly discharged to the outside, and further corrosion can be expected to be prevented. At this time, if the chlorine gas is led outdoors through piping or the like, corrosion of other equipment such as a machine room and a pump room arranged together with the water storage tank can be prevented.

Furthermore, although the slope of the top plate 2 was described in the above embodiment as being higher toward the center, the slope is not limited to this, and it may be higher on one side and lower on the other side. If so, you will achieve your goal.

Effects of the Invention As detailed above, according to the first invention, not only can water be efficiently supplied into the tank main body and the auxiliary tank, but also the main water supply pipe, the auxiliary water supply pipe,
Maintenance and inspection of the upper water level adjustment device and the lower water level adjustment device can be easily performed. Furthermore, since the top plate is slanted, there is no formation of air pockets, and corrosion from this part can be prevented.

Further, according to the second invention, in addition to the effects of the first invention, it is possible to prevent the water in the tank from flowing back into the main water supply pipe due to the siphon phenomenon, and there is an effect that there is no need to separately provide a backflow prevention means.

[Brief explanation of drawings]

The figure is a sectional view of an embodiment embodying the present invention. Tank body...1, Auxiliary tank...3, Main water pipe...7, Through hole as siphon breaking communication part...
7a, Main positioning water level valve as lower water level adjustment device...
...8, Main valve...8a, Sub-water supply pipe...10, Sub-positioning water level valve as an upper water level adjustment device...11.

Claims (1)

[Claims] 1. A smaller auxiliary tank is formed in the upper part of the tank body so as to communicate with the inside of the tank body, and an auxiliary water supply pipe is introduced into the auxiliary tank,
The auxiliary water supply pipe is equipped with an upper water level adjustment device that stops water supply when the water level in the auxiliary tank reaches the upper fixed water level, and resumes water supply when the water level is below that level.
In a water storage tank where a main water supply pipe is introduced into the auxiliary tank, and the main water supply pipe is equipped with a lower water level adjustment device that stops water supply when the water level reaches the lower fixed water level and resumes water supply when the water level is lower than that level. , the top plate of the tank body is formed in a slanted shape, the auxiliary tank is provided on the slanted top plate, the auxiliary water supply pipe is made small in diameter with a small amount of water supplied per unit time, and the main water supply pipe is formed as an auxiliary water supply pipe. The main valve is introduced into the tank body through the inside of the tank and has a large diameter that allows for a large amount of water to be supplied per unit time, and the main valve that opens and closes the main water pipe by the lower water level adjustment device is installed outside the auxiliary tank. A water storage tank characterized by being installed in. 2. A smaller auxiliary tank is formed at the top of the tank body so as to communicate with the inside of the tank body, and a sub-water supply pipe is introduced into the auxiliary tank,
The auxiliary water supply pipe is equipped with an upper water level adjustment device that stops water supply when the water level in the auxiliary tank reaches the upper fixed water level, and resumes water supply when the water level is below that level.
In a water storage tank where a main water supply pipe is introduced into the auxiliary tank, and the main water supply pipe is equipped with a lower water level adjustment device that stops water supply when the water level reaches the lower fixed water level and resumes water supply when the water level is lower than that level. , the top plate of the tank body is formed in a slanted shape, the auxiliary tank is provided on the slanted top plate, the auxiliary water supply pipe has a small diameter that allows for a small amount of water to be supplied per unit time, and the main water supply pipe has a small diameter. In addition to using a large diameter valve that allows for a large amount of water to be supplied per hour, a main valve that opens and closes the main water supply pipe using the lower water level adjustment device is installed outside the auxiliary tank, and the main water supply pipe introduced into the auxiliary tank is connected to the tank. In addition to leading to the main body side, the main water supply pipe in the auxiliary tank communicates the inside of the main water supply pipe with the space above the upper constant water level of the auxiliary tank, and the siphon phenomenon causes water in the tank to flow into the main water supply pipe. A water storage tank characterized by having a siphon-breaking communication part for preventing backflow of water. 3. The water storage tank according to claim 2, wherein the siphon-breaking communication portion is a plurality of through holes. 4. The main water supply pipe is introduced from the side of the auxiliary tank, extends parallel to the top plate of the auxiliary tank to near the opposite side, and is bent downward to be guided below the constant water level of the lower part of the tank body. The water storage tank described in Items 2 and 3.