JPH01111695A - Water storage tank - Google Patents

Abstract

PURPOSE:To prevent the corrosion of a tank, by obliquely forming the under surface of the top plate of a tank main body toward an auxiliary tank and providing a lower water level control device and an upper water level control device in the auxiliary tank and providing a plurality of through-holes injecting water by water pressure to the main water feed pipe in the auxiliary tank. CONSTITUTION:Since a main water feed pipe 7, an auxiliary water feed pipe 10, a main normal water level valve 8 and an auxiliary normal water level valve 11 are provided to a small-sized auxiliary tank 3 in a conc. state, they come close to each other, and maintenance and inspection become easy. Since the main water feed pipe 7 is immersed in the water stored in a tank main body 1, the stored water rises through said main water feed pipe 7 by a siphon phenomenon but, since a plurality of through-holes 7a are provided to the bent part of the main water feed pipe 7 in the auxiliary tank 7, the rising water is discharged from said through-holes 7a. Since the emitting parts of the auxilia ry water feed pipe 10 and bypass pipe 9 have a structure not sunk under the surface of the water, no back flow is generated therein. Since the under surface of a top plate 2 is inclined toward the auxiliary tank 3, air is discharged to the outside from an air vent pipe 5 through the auxiliary tank 3.

Description

[Detailed description of the invention] purpose of invention (Industrial application field) This 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 space inside the tank, so that the chlorine gas is easily dissolved in the water droplets.

Then, as the outside temperature rises, the water droplets evaporate, and as water is deformed and released, chlorine gas is continuously dissolved in the water droplets, and the chlorine in the water droplets is gradually -a-condensed. As a result, the water droplets exhibit an oxidizing effect and corrode the water storage tank 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, making the above-mentioned corrosion phenomenon even more pronounced.

Therefore, in order to eliminate the corrosion phenomenon of the tank body itself, it has been proposed that, for example, an auxiliary tank is installed above the tank body, and a water supply pipe and a water level adjustment device are installed in the tank body and the auxiliary tank, respectively. (Jikko 5)
No. 6-17583).

This water storage tank was designed so that the main body of the tank was always filled with stored water, and the water level in the auxiliary tank was always maintained.

(Problems to be Solved by the Invention) However, since the conventional water storage tank is configured such that the tank main body and the auxiliary tank are each provided with a water supply pipe and a water level adjustment device, the tank main body and the auxiliary tank are Each water supply pipe and each water level adjustment device are separated from each other by a large distance, making it difficult to maintain and inspect them.

In particular, since the discharge port of the water supply pipe connected to the tank body is always located within the stored water, there is a risk that the stored water will flow back through the water supply pipe. Therefore, not only is it difficult to maintain and inspect this water supply pipe, but it is also necessary to separately install backflow prevention means such as a backflow prevention valve or vacuum breaker, which complicates the bone structure. There's a problem.

In addition, in conventional water storage tanks, the bottom surface of the top plate of the tank body is formed flat, so defects in the foundation, welding distortion, etc. when installing the water storage tank can cause the bottom surface of the top plate and the stored water to overlap. There was a problem in that air could accumulate between the two, making the lower surface of the top plate susceptible to corrosion.

Furthermore, although the conventional water storage tank structure can prevent corrosion of the tank body, there is no means to prevent corrosion of the auxiliary tank, so every time the auxiliary tank corrodes, it must be replaced with a new one. There was also the problem of not being able to do so.

Structure of the Invention (Means for Solving the Problems) This invention has been made to solve the above problems, and the first invention is to provide an auxiliary tank smaller than the tank body to the top plate of the tank body. The lower surface of the top plate of the tank body is formed in a diagonal direction toward the auxiliary tank, and the auxiliary tank has a main water supply pipe and a water level in the tank body that reaches a predetermined level. A lower water level adjustment device that stops the water supply to the main water supply pipe is provided, and an upper water level adjustment device that stops the water supply to the auxiliary water supply pipe when the water level in the auxiliary water pipe and the auxiliary tank reaches a predetermined amount. The gist of the project is a water storage tank.

In addition to the structure of the first invention, the gist of the second invention is a water storage tank in which the main water supply pipe in the auxiliary tank is provided with a plurality of through holes through which water is jetted out by water pressure. It is.

(Function) By employing the above configuration, in the first invention, when the water level in the tank body reaches a predetermined amount during water supply, the lower water level adjustment device first operates to stop the water supply from the main water supply pipe. Then, when the water level in the auxiliary tank reaches a predetermined level, the upper water level adjustment device operates to stop the water supply from the auxiliary water pipe. In this way, water is always present in the auxiliary tank.

By the way, since the main water supply pipe, the lower water level adjustment device, the auxiliary water supply pipe, and the upper water level adjustment device are centrally provided in this auxiliary tank, they are located close to each other, making maintenance and inspection easy.

In addition, since the lower surface of the top plate of the tank body is formed slanted toward the auxiliary tank, even if there is a defect in the foundation, welding distortion, etc. when installing the water storage tank, the lower surface of the top plate and the stored water Air does not accumulate between the two, and this air moves along the top plate into the auxiliary tank. Therefore, corrosion of the lower surface portion of the top plate is prevented.

Furthermore, in the second invention, in addition to the effect of the first invention, when water is supplied to the auxiliary tank from the main water supply pipe, water is ejected from the plurality of through holes of the main water supply pipe due to the water pressure, so that the auxiliary tank The inside surface is cleaned. Furthermore, when the water supply from the main water supply pipe is stopped, the stored water rises up the main water supply pipe due to a siphon effect, but this water is discharged from the through hole. Therefore, there is no need to provide a backflow prevention means such as a backflow prevention valve or a vacuum breaker.

(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

The tank body 1 has a top plate 2 formed in an oblique manner such that both upper and lower surfaces thereof are raised upward at the center, and an auxiliary tank 3 whose lower part communicates with the tank body 1 is provided at the center. This auxiliary tank 3 is formed smaller than the tank main body 1.

The upper plate 4 of the auxiliary tank 3 is provided with a manhole 6 having a vent pipe 5 and a lid 6a that open to the outside, and a main water supply pipe 7 and an overflow pipe 12 are further connected to the side plate. The main water supply pipe 7 in the auxiliary tank 3 is directed downward L.
The tank body 1 extends in a shape such that its lower end opening is always immersed in the water stored in the tank body 1. Furthermore, a plurality of through holes 7a are provided in the bent part of the main water supply pipe 7 in the auxiliary tank 3, and when water is supplied, the water pressure is applied to the through holes 7a from the inside surface of the auxiliary tank 3. Water is sprayed out to clean the area.

The main water supply pipe 7 is provided with a main positioning water level valve 8 as a lower water level adjusting device. The main fixed water level valve 8 is composed of a main valve 8a provided outside the auxiliary tank 3 and a subsidiary valve 8b provided inside the auxiliary tank 3 via a bypass pipe 9. It is placed above the surface. And the main positioning water level valve 8
When the ball tap 8C of the child valve 8b detects that the water level in the tank body 1 has reached the position indicated by line A in the figure, it operates to stop the water supply to the bypass pipe 9, and based on the operation of the child valve 8b, the main valve 8a is adapted to stop the water supply from the main water supply pipe 7.

Furthermore, a sub-water supply pipe 10 having a flow rate lower than that of the main water supply pipe 7 is provided in the auxiliary tank 3 . This auxiliary water supply pipe 10 is connected to the main water supply pipe 7 on the water source side rather than the main valve 8a, and the discharge port that is always opened above the water surface in the auxiliary tank 3 has an upper water level adjustment device. A secondary positioning water level valve 11 is provided. The auxiliary water level valve 11 is configured to stop the water supply from the auxiliary water supply pipe 10 when its ball tap lla detects that the water level in the auxiliary tank 3 has reached a predetermined position.

The water storage tank configured as described above is different from a conventional water storage tank in which the tank main body and the auxiliary tank are each provided with a water supply pipe and a water level adjustment device. Since the pipe 10, the main positioning water level valve 8, and the sub-positioning water level valve 11 are provided in a concentrated manner, they are close to each other, making maintenance and inspection easy.

Furthermore, in this embodiment, since the main water supply pipe 7 is immersed in the stored water in the tank body 1, the stored water rises inside this main water supply pipe 7 due to the siphon phenomenon, but the main water supply pipe 7 inside the auxiliary tank 3 Since a plurality of through holes 7a are provided in the bent portion of , the rising water is discharged from these through holes 7a. Further, 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.

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 to accommodate the feces. However, in this embodiment, since 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 unlike before, there is no worry about overflow, and the auxiliary tank 3 is small. That's fine. Therefore, the number of members used for the effective amount of water is reduced, and costs can be reduced.

Further, in this embodiment, a through hole 7a is provided in the main water supply pipe 7 in the auxiliary tank 3, so that water is ejected from the through hole 7a against the inner surface of the auxiliary tank 3 due to the water pressure during water supply. Therefore, this water spout causes the auxiliary tank 3
Since the inner surface of the pipe is cleaned, corrosion is prevented.

In addition, if the top plate of a water storage tank is flat, 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 bottom surface of the top plate 2 Air is discharged to the outside from the ventilation pipe 5 via the auxiliary tank 3. 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 upper 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 embodiments, but for example, by providing a ventilation fan to the auxiliary tank 3,
The free gasified chlorine gas in the auxiliary tank 3 may be forcibly discharged to the outside of the auxiliary tank 3. 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. Note that 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.

Further, in the above embodiment, the main water supply pipe 7 was attached to the side plate of the auxiliary tank 3, but it may be attached to the upper plate 2 instead (in addition, the bypass pipe 9 and the auxiliary water supply pipe 1O are attached to the upper plate 2). Alternatively, it may be attached to the side plate.

Effects of the Invention As detailed above, according to the water storage tank of the first invention, the main water supply pipe, the auxiliary water supply pipe, the upper water level adjustment device, and the lower water level adjustment device are concentrated in the auxiliary tank. maintenance and inspection can be carried out easily. In addition, since the bottom surface of the top plate of the tank body is formed in a slanted shape toward the auxiliary tank, air will not accumulate on the bottom surface of the top plate (
Corrosion of the same area can be prevented.

In addition, according to the second invention, in addition to the effects of the first invention, there is no need to separately provide a device for preventing backflow in the main water supply pipe, and when water is supplied, water is assisted by the water jetting out from the through hole. The inner surface of the tank can be cleaned,
As a result, corrosion of the inner surface of the auxiliary tank can be prevented.

[Brief explanation of the drawing]

The figure is a sectional view of an embodiment embodying the invention. Tank body 1, top plate 2, auxiliary tank 3, main water supply pipe 7, through hole 7a, main fixed water level valve 8 as a lower water level adjustment device, sub water supply pipe 10, sub fixed water level valve 1 as an upper water level adjustment device
1゜゛

Claims (1)

[Scope of Claims] 1. An auxiliary tank smaller than the tank body is formed in communication with the top plate of the tank body, and the bottom surface of the top plate of the tank body is formed obliquely toward the auxiliary tank. , the auxiliary tank is provided with a main water supply pipe and a lower water level adjustment device that stops water supply from the main water pipe when the water level in the tank body reaches a predetermined level, and the water level in the auxiliary water pipe and the auxiliary tank is A water storage tank characterized in that it is provided with an upper water level adjustment device that stops water supply from the auxiliary water supply pipe when a predetermined amount is reached. 2. An auxiliary tank smaller than the tank body is formed in communication with the top plate of the tank body, the bottom surface of the top plate of the tank body is formed in an oblique shape toward the auxiliary tank, and the auxiliary tank has a A lower water level adjustment device is provided that stops water supply from the main water pipe when the water level in the main water pipe and the tank body reaches a predetermined level, and when the water level in the sub water pipe and the auxiliary tank reaches a predetermined level. A water storage tank comprising: an upper water level adjustment device for stopping water supply to the auxiliary water supply pipe; and further comprising a plurality of through holes in the main water supply pipe in the auxiliary tank through which water is spouted out by water pressure.