JPH10252916A - Mechanism for draining water from case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for draining water from a case which has a simple structure and can be easily fitted to the case and can prevent the debris from invasion at ordinary time and can drain the water automatically and promptly when the water is accumulated. SOLUTION: A case drain hole 16 is formed penetratingly at a bottom section 10, an outer container 12 is provided so as to cover the whole case drain hole 16 on the outer side face of its bottom section. A drain hole 20 is provided at the lowest section or near by of this outer container 12. A float valve 14 is stored in the space in the outer container 12, and this float valve 14 blocks the drain hole at an ordinary case when no water outflow from the case drain hole 16 into the outer container 12, at a case when the water outflows, it opens the drain hole 20 and drains the water by floating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water drainage mechanism in a case, and more particularly to a mechanism for automatically draining water in a case where accumulation of liquid such as water may cause various problems.

[0002]

2. Description of the Related Art Cases where it is necessary to prevent continuous accumulation of water inside, for example, outdoor high-pressure bus ducts used to hold and protect electric trunk lines for power transmission,
Alternatively, in an outdoor transformer box or the like for connecting a transformer and an electric trunk to protect the surroundings, it is necessary to prevent water pooling by completely sealing or to effectively drain the pooled water.

[0003] This is because if water accumulates inside the case as described above, the insulating support (insulator or the like) may be moistened, causing an unexpected short circuit or ground fault. For this purpose, it is necessary to maintain the hermeticity of the case as much as possible to prevent the accumulation of water, or to effectively perform drainage after the fact. In particular, in the latter case, it was necessary to add a drainage structure to the case.

[0004]

In such a case, it is very difficult to complete the hermeticity of a liquid such as water. For example, when a metal plate (steel plate) is used as a structure, rainwater infiltrates through a joint or a screw hole for fixing, and the use of equipment.
There is a possibility that water will accumulate on the bottom surface inside the case due to dew condensation inside due to the temperature difference due to non-use.

[0005] Further, the addition of a configuration for effectively draining accumulated water afterwards increases the complexity of case manufacture and increases the manufacturing cost. It is also conceivable to provide a drain hole in the case itself in order to always allow drainage. However, there is a possibility that foreign matter such as dust and dirt may enter through the hole that is always open, which is not preferable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has a simple structure and can be easily attached to a case.
It is an object of the present invention to provide an in-case water drainage mechanism that can automatically drain water when water accumulates in the case.

[0007]

According to a first aspect of the present invention, there is provided a water draining mechanism in a case, wherein a case drainage hole is formed through a bottom of a case, and the entire case drainage hole is formed on an outer surface of the bottom. Provide an external container to cover. A drain hole is provided at or near the lowermost portion of the outer container.
In the space inside the outer container, a float valve is housed. The float valve closes the drain hole in a normal state where there is no outflow of water from the case drain hole into the outer container. In a state where there is, it floats and opens the drainage hole.

[0008] As described above, with a very simple structure, in a normal state (normal state) in which no water accumulates in the case, the drainage hole of the external container communicating the inside of the case and the outside is closed, and the accumulated water is closed. In the generated state, the water collected from the drain hole can be discharged.

The drainage mechanism in the case according to a second aspect of the present invention is characterized in that the position regulating means for regulating the position of the float valve in the outer container so that the float valve properly closes the drainage hole in the normal state. Provided. Accordingly, it is possible to reliably avoid a situation in which the float valve floats and shifts position due to the accumulated water, and a situation in which the water drain hole cannot be properly closed after the water drain operation is generated. That is, it is possible to prevent the float valve from moving to a position other than the position of the drain hole.

According to a third aspect of the present invention, in the case water drainage mechanism, a plurality of rod-shaped members are provided around the float valve as the position restricting means for restricting a floating operation range of the float valve from outside. Thereby, the float valve performs a floating operation inside the plurality of rod-shaped members. That is, the floating operation range of the float valve is restricted from the outside, and the float valve is reliably prevented from moving to a position where the drain hole cannot be closed.

According to a fourth aspect of the present invention, in the case water drainage mechanism, the position restricting means is provided with a through hole in the float valve, and a rod-like member for restricting the floating operation of the float valve from inside is formed in the through hole. It is configured by inserting. Accordingly, the float valve performs a floating operation around the rod-shaped member in a range of a gap (margin) between the outer surface of the rod-shaped member and the inner surface of the through hole. That is, the floating operation range of the float valve is restricted from the inside by the rod-shaped member, and it is reliably prevented that the float valve is moved to a position where the drain hole cannot be closed.

According to a fifth aspect of the present invention, in the case water draining mechanism, the position regulating means is formed such that the inner shape of the outer container gradually decreases in diameter toward the bottom, and the drain hole is formed at the bottom of the bottom. And the float valve is positioned directly above the drain hole in the normal state.

[0013] This achieves the configuration of the position regulating means without providing a separate member on the main body of the outer container. That is, in the normal state, the float valve is always located immediately above the water drain hole formed at the bottom of the bottom portion due to the internal shape of the outer container whose inner diameter decreases toward the bottom side.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the first embodiment, which is an example applied to an outdoor high-pressure bus duct. FIG. 1 shows a bottom 10 a of a case 10, an external container 12 attached to an outer surface of the case 10, a float valve 14 housed in the inside, and the like.

As shown in FIG.
a is provided with three case drain holes 16 for discharging accumulated water, and three screw holes 18 for fixing the external container 12 attached to the outside of the case bottom 10a. The insides of these screw holes 18 are threaded.

The outer container 12 has a size such that the upper opening 12a covers the entire three drain holes 16 provided in the case bottom 10a. The internal shape has a mortar shape or a bowl shape whose diameter gradually decreases toward the bottom portion 12b,
A drain hole 20 is formed in the arc-shaped bottom portion 12b. An outwardly extending flange 12c is formed integrally with the peripheral edge of the upper end, and a screw component insertion hole 22 is formed in the flange 12c at a position corresponding to the screw hole 18 provided in the case bottom 10a.

Inside the outer container 12, a float valve 14 for automatically closing and opening the drainage hole 20 provided at the lowermost portion of the container is accommodated. The float valve 14 has a spherical configuration having a specific gravity smaller than that of water, and floats in the space inside the outer container 12. Therefore, in a normal state where no water is present, the float valve 14 is located just above the drainage hole 20 at the bottom and bottom of the external container 12 without floating, and closes the same. On the other hand, in a state where water is present, the float valve 14 floats and rises from the bottom 12b, and the water drain hole 20
Is released.

The size of the float valve 14 is
It is a size that can be closed by being located on the upper side, and is located on the bottom portion 12b in a normal state where there is no water in the outer container 12, and the drainage hole 20 can be closed.

In the figure, three screw members 24 are used.
Is for attaching the outer container 12 to the bottom 10a of the case 10, and the three washers 26 are attached when these screw members are fastened.

Next, the operation of the first embodiment having the above configuration will be described with reference to FIGS. FIG.
FIG. 3 shows a state when there is no accumulated water at the case bottom 10a, and FIG. 3 shows a state when there is accumulated water (water is not shown). As shown in FIG. 2, in a normal state in which water does not accumulate in the case 10, the float valve 14 is located at the lowermost part of the outer container 12, and keeps the drainage hole 20 in a closed state. Prevents dust and moisture from entering the case.

As shown in FIG. 3, when water accumulates at the bottom of the case accidentally due to rain or dew condensation, the water flows into the outer container 12 through the drain holes 16 of the case. The float valve 14, which is lighter than water, automatically floats. As a result, the drainage hole 20 of the external container 12 that has been closed is opened, and water is drained to the outside through the drainage hole 20.

Further, with the completion of drainage, the float valve is automatically lowered, and is located in the state shown in the drawing, that is, at the lowermost part of the outer container 12 which is in a normal state, and closes the drainage hole 20 so that the outside is closed. To prevent dust and moisture from entering the case. In the present embodiment, since the shape of the external container 12 is mortar-shaped or bowl-shaped as described above, the position of the float valve 14 in the normal state is always the lowest position of the stable bottom portion 12b. Become. Therefore, the closed state of the drain hole 20 is stably secured.

Next, a second embodiment will be described with reference to FIG. FIG. 1 shows a bottom portion 10a of a case 10, an external container 30 attached to an outer surface thereof, a float valve 14 housed in the inside, and the like. In the following description, the same components as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals.

As shown in the figure, three drain holes 16 for discharging the accumulated water are formed in the bottom 10a of the case such as an outdoor high-pressure bus duct where the water accumulates, similarly to the first embodiment. Three screw holes 18 are provided for fixing an external container 30 attached to the outside of the case bottom 10a.

The outer container 30 has three drain holes 16 and screw holes 18 provided in the case bottom 10a with an upper opening 30a.
It has a cylindrical shape large enough to cover the whole, and has three drain members at positions corresponding to the drain holes 20 at substantially the center of the lowermost bottom portion 30b and the screw holes 18 provided at the case bottom portion 10a. It has an insertion hole 32.

A drain hole 20 is provided inside the outer container 30.
There is provided a float valve 14 for automatically closing / opening the water drainage hole depending on the presence / absence of water. The closing / opening operation of the drainage hole 20 by the float valve 14 is the same as in the first embodiment.

This embodiment is characterized in that three screw members 3 inserted through the screw member insertion holes 32 and the screw holes 18 are provided.
4 is to regulate the range of the floating operation of the float valve 14 from outside. That is, the three screw members 34 are arranged around the float valve 14, and the float valve 14 performs a floating operation inside the float valve 14.

Next, the operation of the second embodiment having the above configuration will be described with reference to FIGS. FIG. 5 shows a state in which there is no accumulated water in the case bottom 10a, FIG. 6 shows a state in which there is accumulated water, and FIG. 7 shows AA in FIG.
FIG. 8 is a sectional view taken along arrow BB in FIG. 6.

As shown in FIGS. 5 and 7, in a normal state where no water is accumulated in the case 10, the float valve 14
Does not shift laterally beyond the allowance due to the position restriction of the screw member 34 arranged with a margin around it. Therefore, the drainage hole 20 is located almost at the center of the lowermost portion of the outer container 12, and the drainage hole 20 is kept in a closed state, so that dust and moisture from the outside are prevented from entering the case.

As shown in FIGS. 6 and 8, when water accumulates at the bottom 10a in the case 10 due to rain or dew condensation, the float valve 14 is turned off as in the first embodiment. Floats and opens the drain hole 20. The range of the floating operation of the float valve 14 in the present embodiment is regulated by the three screw members 34, and there is no possibility that the float valve 14 is shifted to a position shifted from the drain hole 20. The operation associated with the end of the drainage operation is the same as in the first embodiment, and closes the drainage hole 20 inside the screw member 34.

Next, a third embodiment will be described with reference to FIG. FIG. 1 shows a bottom 10 a of a case 10, an external container 40 attached to an outer surface thereof, a float valve 50 housed in the inside, and the like.

As shown in the figure, a case bottom 10a for collecting water, such as an outdoor high-pressure bus duct, is provided with four case drainage holes 16 for discharging the pooled water. Is provided with one screw hole 18 having an internally threaded portion for fixing the external container 40 on the outer surface of the case bottom 10a.

The outer container 50 has a substantially cylindrical shape with an open top as in the second embodiment, and has four drain holes 42 at the bottom portion 40b and a screw member substantially at the center thereof. An insertion hole 44 is provided. 40a is an external container 50
It is the upper open part of the.

A feature of the present embodiment is that the floating operation range of the float valve 50 is restricted from inside the float valve 50. As a configuration for this, a through hole 52 is provided substantially at the center of the float valve 50 as shown, and
No. 0 fixing screw member 46 is inserted. That is, the screw member 46 is inserted into the screw member insertion hole 44 formed substantially at the center of the bottom 40 b of the outer container 40 and the through hole 52 of the float valve 50, and is fastened at the screw hole 18. . As a result, the float valve 50 is
The floating operation is possible only within the range of the allowance for the second screw member 46.

The float valve 5 according to the present embodiment
0 has a substantially columnar shape, and the upper surface portion is attached to the outer surface of the case bottom portion 10a when moved to the uppermost portion, so that the upper surface portion does not descend even after the outflow of water is completed. In order to effectively prevent this, irregularities are formed as shown.

Next, based on FIG. 10 and FIG.
The operation of the embodiment will be described. FIG. 10 shows a state when there is no accumulated water in the case bottom 10a, and FIG. 11 shows a state when there is accumulated water. FIG.
However, in a normal state where water does not accumulate in the case, the float valve 50 does not shift laterally due to the position regulation of the screw member 46 arranged at the center thereof, and is located at the lowermost portion of the outer container 40. The drain hole 42 is kept closed to prevent dust and moisture from entering the case.

As shown in FIG. 11, if water accumulates at the bottom of the case accidentally due to rain or dew condensation, the water flows into the outer container 40 through the case drain hole 16 and
Thus, the float valve 50 is automatically lifted up using the screw member 46 as a guide, and opens the drainage holes 42 of the closed external container 50. This causes the accumulated water to flow out. The operation after the end of the spill is
This is the same as the above embodiment.

Next, a fourth embodiment will be described with reference to FIG. FIG. 1 shows a bottom portion 10 a of the case 10, an external container 60 attached to an outer surface thereof, a float valve 70 housed in the inside, and the like.

As shown in the figure, four case drain holes 16 for discharging the accumulated water are provided in the case bottom 10a where water is collected, such as an outdoor high-pressure bus duct, as in the third embodiment. At a substantially central position of the case drain holes 16, a single screw hole 18 having an internally threaded portion for fixing the external container 40 is provided on the outer surface of the case bottom 10 a.

The outer container 60 has a substantially cylindrical portion 60b having an upper open portion 60a and a slope 60c continuous below the portion 60b with a smaller diameter.
Four drain holes 62 are provided at the portion c. The screw member insertion hole 6 is provided substantially at the center of the bottom portion 60d.
4 are provided.

On the other hand, the float valve 70 is
0 has a shape corresponding to the internal shape. That is, it is composed of an upper columnar portion 70a and an inclined portion 70b which is continuous with the upper columnar portion 70a so as to reduce the diameter. A through hole 72 is provided in the central portion in the axial direction.

Next, the operation of the fourth embodiment will be described with reference to FIGS. FIG. 13 shows a state where there is no accumulated water on the lower surface of the case, and FIG. 4 shows a state where there is accumulated water. In the present embodiment, the fact that the external container 60 is fixed by the screw member 46 and the floating operation range of the float valve 70 is restricted from inside is the same as in the third embodiment. The function of flowing out from the drain hole 62 and the function of closing the same are basically the same as those of the above-described embodiments.

A feature of this embodiment is that the drainage hole 6 is formed in the slope 60 c of the outer container 60.
2 is provided, which is closed at the inclined portion 70b of the float valve 70, whereby the closing operation of the drainage hole 62 in the normal state is more reliably performed. That is, since the diameter of the float valve 70 in the direction of gravity is reduced, the adhesion between the float valve 70 and the external container 60 is further improved. Note that the float valve 70
The shape of the upper end surface can be made uneven as in the third embodiment.

It should be noted that the present invention is not limited to the configurations of the above embodiments, and various modifications can be made within the scope of the invention. For example, the shapes of the float valve and the external container in the third and fourth embodiments are not limited to the above-described cylindrical or columnar shapes, but may be polygonal.

[0045]

As described above, the water drainage mechanism in the case according to the present invention automatically and promptly drains water when water accumulates in a case where it is not preferable that the state where water accumulates continues. Water can be drained through an external container provided outside of the case, and in a state where water does not accumulate, the communication passage between the case and the outside is closed to effectively prevent foreign matter from entering the case. can do.

As a result, the liquid such as water accumulated in the case is not left for a long time, and the occurrence of various problems due to the presence of the liquid can be avoided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a case bottom, an external container, and a float valve according to a first embodiment.

FIG. 2 is an explanatory diagram of a normal state in which water does not accumulate in the first embodiment.

FIG. 3 is an explanatory diagram of a state in which water accumulates in the first embodiment.

FIG. 4 is a configuration diagram of a case bottom, an external container, and a float valve according to a second embodiment.

FIG. 5 is an explanatory diagram of a normal state in which water does not accumulate in the second embodiment.

FIG. 6 is an explanatory diagram of a state in which water is accumulated according to the second embodiment.

FIG. 7 is a sectional view taken along the line AA of FIG. 5;

FIG. 8 is a sectional view taken along the line BB of FIG. 6;

FIG. 9 is a configuration diagram of a case bottom, an external container, and a float valve according to a third embodiment.

FIG. 10 is an explanatory view of a normal state in which water does not accumulate in the third embodiment.

FIG. 11 is an explanatory diagram of a state in which water accumulates in the third embodiment.

FIG. 12 is a configuration diagram of a case bottom, an external container, and a float valve according to a fourth embodiment.

FIG. 13 is an explanatory diagram of a normal state in which water does not accumulate in the fourth embodiment.

FIG. 14 is an explanatory diagram of a state in which water has accumulated in the fourth embodiment.

[Explanation of symbols]

 10 Case 12, 30, 40, 60 External container 14, 50, 70 Float valve 16 Case drain hole 18 Screw hole 20, 42, 62 Drain hole 32, 44, 64 Screw member insertion hole 34, 46 Screw member 52, 72 Through hole

Claims (5)

[Claims] A case drain hole formed through the bottom of the case; and an outer container provided on the outer surface of the case bottom so as to cover the entire case drain hole, and having a drain hole at the lowermost portion or in the vicinity thereof. The drainage hole is housed in the space inside the external container, closes the drainage hole in a normal state in which water does not flow out of the case drainage hole into the external container, and floats in a state in which water flows out, and floats in the drainage hole. And a float valve that opens the drain valve. 2. The apparatus according to claim 1, further comprising a position regulating means for regulating the position of the float valve in the outer container so that the float valve properly closes the drain hole in the normal state. Item 2. A water drainage mechanism in a case according to Item 1. 3. The case according to claim 2, wherein the position restricting means comprises a plurality of rod-shaped members provided around the float valve for restricting a floating operation range of the float valve from outside. Internal water drainage mechanism. 4. The position regulating means includes: a through hole provided in the float valve; and a rod-shaped member inserted into the through hole and restricting a floating operation of the float valve from inside. The water drainage mechanism in a case according to claim 2. 5. The position restricting means, wherein the inner shape of the outer container is shaped such that the diameter gradually decreases toward the bottom, and the drain hole is formed at the bottom of the bottom. The drainage mechanism in a case according to claim 2, wherein the float valve is located right above the drainage hole.