JPS6228392A - Ventilating plug for storage tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a vent plug attached to the ceiling of an aquarium, etc.
In particular, the present invention relates to a storage tank ventilation plug mainly used for panel-assembled water tanks installed outdoors.

[Prior art and issues to be solved]

In recent years, many drinking water tanks installed in buildings are made of FRP, but in order to balance the color with the building, pale cream-colored tanks have become mainstream.

However, especially in aquariums installed on rooftops, sunlight shines directly on them. Such aquariums are generally equipped with a vent plug on the ceiling or the top of the side panel, and this vent plug is used to keep the air pressure inside the tank constant (atmospheric pressure) as water enters and exits the tank. It acts as a regulating valve to take in and take out the water.

Therefore, this vent plug has a structure that is open to the atmosphere, so sunlight is reflected by ceiling panels etc.
Currently, light enters the tank due to repeated diffuse reflections within this vent plug.

According to actual measurements, the illuminance near the ventilation plug in the tank under clear skies was 110 lux or more. However, in general, when the illuminance inside the tank exceeds 50 lux, green algae will grow in the tank due to photosynthesis, which will have an adverse effect on drinking water.

An object of the present invention is to obtain a ventilation plug for a storage tank that prevents reflected light from entering the tank and prevents the growth of green algae by improving the ventilation plug.

[Structure of the invention]

The present invention is a vent plug attached to the ceiling or the upper part of a side plate of a storage tank, and is characterized in that the inner surface of the lid material covering the vent communicating with the inside of the storage tank is made of a light-absorbing dark color.

In this case, the light-absorbing dark color is preferably a black color, but may be a brown color or a blue color depending on the case, and it is further preferable that a matte treatment is applied to prevent diffused reflection.

There are various types of vent plugs, but examples include arm-shaped caps that cover the vent holes, cylindrical ones, etc., which are characterized by having at least the inner surface of these caps have a specific color as described above.

[Embodiments of the invention]

FIG. 1 is a partially cutaway side view showing an example of a vent plug, which is entirely made of synthetic resin material.

A cylindrical lip 2 is formed on the outer periphery of the lower part of the cylindrical vent 1, and this lip 2 is fitted into the play hole 4 of the ceiling panel 3 to serve as a stopper. At the time of this fitting, a packing material is fitted (not shown), and the nut 5 can be seen from inside the tank.
Then, it is screwed into the male screw 6 carved on the outer periphery of the lower end of the rib 2 and fixed.

On the other hand, the upper peripheral end of the vent hole 1 has a slightly thick protruding peripheral part 7, and a male thread 8 is carved on the surface of this peripheral part 7. A disc-shaped frame 9 is screwed onto this.

This frame 9 has double cylinders 10 and 11, which are connected to each other by a bridge (not shown), and a slit-shaped gap 12 is opened between them. A large opening 13 is formed in the center, and a slit-like cavity 12 is covered with a net 14 to prevent dust and small insects from entering the tank.

A male thread 15 is cut into the inner cylindrical body 10, and is screwed into the male thread 8 on the protruding peripheral portion 7 of the vent 1 described above.

Further, on the outer periphery of the cylindrical body 11 of the frame 9, a male thread 17 is carved into which a bowl-shaped lid member 16, which will be described later, is screwed. A female thread 18 is cut into the inner periphery of the lower end of the bowl-shaped lid member 16, and is adapted to be screwed into the male thread 17 described above.

In this vent plug, reflected light from the ceiling panel surface enters the inside of the vent plug through the slit-shaped gap 12 in the frame 9 covered with the lid material 16, and passes through the inner surface 19 of the lid material 16 and the inner surface 20 of the vent hole 1. This causes light to enter the aquarium through complex reflections.

In this example, the inner diameter (L) of the vent l is 60cm, the height H) is 120fi, and the diameter (R) of the lid 16 is 1
001, the width (W) of the slit 12 of the frame 9 is 20*m. The color is light cream. In this case, the illuminance directly under the vent plug in the tank under clear skies is 1 as described above.
There were more than 10 looks.

On the other hand, when the inner surface 19 of the bowl-shaped lid material 16 was made black and treated with a matte finish, the illuminance in the same tank was less than 10 lux, and light was almost completely blocked. I found out.

A porous material such as a foam may be attached to the inside of the bowl-shaped lid member 16 to improve the filtering effect.

FIG. 2 shows another example of a ventilation plug, in which one end of a lid member 16, which is a curved cylindrical body, is screwed into a connecting pipe 21 attached to a ceiling panel 3. In this case as well, it was found that light absorption was almost complete by making one of the inner circumferential parts of the lid material 16 black.

In these examples, it is more preferable not only to make the inner surface 19 of the lid 16 a light-absorbing dark color, but also to make the inner surface 20 of the vent 1 a similar color. It may be colored in the same color.

〔Effect of the invention〕

The present invention has the above configuration and improves the ventilation plug that allows light to pass through the tank, thereby making it possible to block most of the reflected light. Therefore, it is possible to prevent the growth of green algae due to photosynthesis, which has been a concern in the past. , it has excellent effects that can provide an aquarium that is highly desirable from a sanitary perspective.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an example of the vent plug of the present invention, and FIG. 2 is a partially cutaway side view showing another example of the vent plug of the present invention. DESCRIPTION OF SYMBOLS 1...Vent, 2...Rib, 3...Ceiling panel, 7...Protrusion, 9...Frame,
10.11... cylinder body, 12... void,
16... Lid material, 19... Inner surface of the lid material. Agent Patent Attorney Nakajima 1st Figure 9 2nd Figure

Claims (1)

[Claims] (1) A vent plug for a storage tank, which is attached to the ceiling or the upper part of a side plate of a storage tank, and is characterized in that the inner surface of a lid material covering a vent communicating with the inside of the storage tank is made of a light-absorbing dark color.