JPS64761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an indoor lighting device for an indoor sewage treatment plant, particularly an indoor sewage treatment plant having a structure having a plurality of intermediate chambers.

(Prior Art) Conventionally, there are large manholes in underground sewage treatment facilities, such as indoor sewage treatment plants, which have a plurality of landings and a plurality of intermediate chambers. In order to brighten each intermediate chamber in this manhole structure, electric wires are brought in from outside the manhole and electric lights are attached to the ceiling of each chamber.

(Problem to be solved by the invention) However, during heavy rain, the water level inside the manhole rises abnormally, and water easily enters the room through the gap in the manhole opening. There is also a high risk of electric shock.

The present invention solves the above problems and eliminates accidents caused by electric shock indoors by guiding ground light into the interior of a sewage treatment plant without using electrical energy.

(Means for Solving the Problems) The lighting device of the present invention that achieves the above object is provided with a plurality of focusing lenses that focus light rays from a light source outdoors on the ground, and receives the focused light at one end of an optical fiber. The other end of the optical fiber is placed on the ceiling of each room in the sewage treatment plant so that the light can be used for illuminating the indoor sewage treatment plant.

In order to guide more light indoors, the number of focusing lenses can be increased to widen the light-receiving area. The light source for the focusing lens is, in principle, direct light or reflected light from the sun during the day, and at night, outside lights, moonlight, or other light sources can be used as appropriate. The number of optical fiber cores is the same as the number of focusing lenses.

The optical fiber of the present invention can be of either a single mode type or a multimode type. In particular, when a band-like type of optical fiber bundled with a large number of optical fibers is used, it is possible to use the optical fiber in an underground sewer. When the wiring is routed deep into the processing equipment, it can be configured to be distributed from an appropriate height position in each intermediate room to each ceiling.

As the material of the optical fiber, silica glass, multi-component glass, plastic, halogen compound crystal fiber, etc. can be used as long as it has high light guiding properties. In recent years, advances in material refining technology have made it possible to obtain materials with less optical loss during transmission, making optical fibers optimal as short-distance optical transmission means in indoor sewage treatment plants.

In order to illuminate the entire room as much as possible with the light emitted from the optical fiber, the other end of the optical fiber core should be formed into a spherical curved surface and a diffuser lens should be essentially attached to it, or a diffuser lens should be attached in front of the other end of the core. A convex lens or a concave lens is arranged as a diffusing lens to actively diffuse the light in multiple directions. The other end of the optical fiber core shall be fitted with a lighting cover, generally transparent or colored. If the illumination light is colored, it can also function as an emergency marker light.

(Function) With the above configuration, light rays from a light source such as the sun outside the indoor sewage treatment facility are condensed to a high density by the focusing lens, and this light enters one end face of the optical fiber. This incident light passes through the optical fiber and spreads out from the other end, illuminating the entire interior of the sewage treatment facility. Even if a sewage treatment facility has a plurality of intermediate rooms, illumination light can be easily guided into each room by simply providing a corresponding number of optical fibers.

Therefore, by using the lighting device of the present invention, illumination light can be freely sent to each room of an indoor sewage treatment plant using optical fibers, and there is no need to run any electric wires indoors. As a result, methane, butane,
There is no fear of personal injury due to electric shock, even in sewer manholes where gases such as hydrogen sulfide are generated, or during rainy weather when a large amount of water enters the room from the manhole opening.

(Example) An example of the present invention will be described below based on the drawings. In Fig. 1, 1 is for a large indoor sewage treatment plant with a width W (diameter if circular) of 15 m to 30 m or more. This is a manhole, and a sewer system runs through the deep part (not shown) of the manhole. A plurality of landings 2 are installed in a manhole 1, and stairs 3 with handrails are provided between vertically adjacent landings 2. The worker can descend the ladder-like lifting device 4 from the entrance 1a of the manhole 1 to reach the top landing 2, then descend the stairs 3 and move to the landing 2 below.

5 is a band-shaped optical fiber wired outside the manhole 1, 6 is a light beam 9 from the sun 7 and an outdoor light 8.
The light focused by the lenses 6 is made incident on each core 5a of the optical fiber 5 by a plurality of focusing lenses. multiple focusing lenses 6
is fixed to the panel 10 so as to receive the light beam 9 at approximately right angles, as shown in FIG.

The lower end of the optical fiber 5 is detachably connected to an optical fiber 12 by an optical connector 11 provided near the entrance/exit 1a. The optical fiber 12 penetrates the landing 2 of the manhole 1 and is routed deep into the manhole 1 along the inner surface of the side wall 1b.
A portion of the core 2 is branched as appropriate, and the output end of each core is disposed at each ceiling.

Therefore, during the day, light 9 from the sun 7 is focused by the focusing lens 6, enters the optical fiber 5, exits from the output end of the optical fiber 12, and enters each chamber 13 of the manhole 1.
It becomes the illumination light. Similarly, at night, the light 9 from the outside light 8 is guided to the optical fibers 5 and 12 to provide illumination light for each room 13. Note that 14 is a lamp cover.

In order to uniformly brighten the inside of each room 13 as a whole, it is preferable to emit light from each core of the optical fiber 12 so as to spread in as many directions as possible. For this purpose, the output end of the core 12a may be formed into a spherical shape as shown in FIG. 3, or a diffusing lens 15 may be provided in front of the core 12a as shown in FIG. In addition, as shown in Fig. 5, multiple cores 1
2a may be placed in an annular colored lamp cover 16.

When not in use, the optical fibers 5 and 12 in the optical connector 11 may be disconnected.

FIG. 6 shows another example of wiring the optical fiber 12, in which the output ends of the optical fiber 12 are arranged at a plurality of locations above the stairs 3. In this case, the output end of the optical fiber 12 may also be arranged above the entrance/exit 2a of each landing 2. In the embodiment, a park or the like can be provided above the manhole 1 to effectively utilize the space.

(Effects of the Invention) The lighting device of the present invention having the above configuration has the following effects.

○B. By using optical fiber, it is possible to provide indoor lighting for sewage treatment plants without using electricity, which will definitely eliminate the conventional explosion accidents caused by sparks from power switches indoors (or outdoors).

○B Conventionally, it was necessary to construct electrical cords and indoor walls with a heavy corrosion-proof structure to prevent them from being attacked by gases generated from underground, and indoor moisture-proofing equipment became a large-scale installation. This eliminates the need for explosion-proof measures and periodic inspections, which is extremely advantageous in terms of construction and maintenance.

○C Water leakage from the outside tends to occur indoors in sewage treatment plants, and conventionally, indoor wiring for lighting optical fibers can be arbitrarily performed even on the inner walls of manholes, which are prone to water leakage, so there is greater freedom in the design of lighting equipment. The indoor working environment and safety are significantly improved.

○D In some cases, conventionally, generators had to be installed indoors or outdoors to power lighting, but the present invention uses sunlight or outdoor lights, so indoor sewage treatment plants can be used in areas where electricity is not available. However, it is a lighting device that does not require the installation of a generator, eliminates energy costs, and has extremely high practical value.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view showing an embodiment of the present invention;
FIG. 2 is a perspective view showing the installation method of the focusing lens; FIGS. 3, 4, and 5 are views each showing an example of the configuration of the output end of the optical fiber; FIG. 6 is another embodiment of the present invention. FIG. 1... Manhole, 5, 12... Optical fiber, 6... Focusing lens, 11... Optical connector, 1
3... Chamber, 15... Diffusion lens.

Claims (1)

[Claims] 1. Equipped with a plurality of focusing lenses that focus the light beams outside the indoor sewage treatment plant, an optical fiber that receives the focused light from the focusing lenses, and an optical connector that is detachably connected to the outdoor and indoor optical fibers,
A lighting device for an indoor sewage treatment plant, characterized in that the output end of the optical fiber is disposed on the indoor ceiling of the sewage treatment plant, and the optical connector is provided near a manhole entrance/exit of the indoor sewage treatment plant.