JPS6037519Y2 - Drainage system for explosion-proof electrical equipment containers - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drainage system for a pressure-resistant explosion-proof container for electrical equipment used in coal mines and the like.

Water is particularly likely to accumulate in the sealed container of explosion-proof electrical equipment due to heat generation due to operation and shutdown of the electrical equipment, and breathing phenomena associated with cooling.

Therefore, this water needs to be drained frequently to maintain the electrical equipment, and the structure of the electrical equipment must comply with Japanese Industrial Standard 1 Explosion-proof construction for coal mine electrical equipment (JIS C0901), depending on the location where the electrical equipment is installed. Must comply with any of the Industrial Safety Research Institute 1 Factory Electrical Equipment Explosion-proof Guidelines of the Ministry of Labor.

In view of the above, the object of the present invention is to provide a safe drainage device that allows water in a container to be easily drained not only when the electrical equipment is stopped, but also when it is in operation, and which satisfies the above standards. .

An embodiment of the present invention will be described.

In FIG. 1, reference numeral 1 denotes a container housing a pressure-resistant and explosion-proof electric device (not shown), and a cylindrical drainage device A is provided at the corner of the bottom plate 2 of the container 1.

A cylindrical inner surface 3 is formed inside the drainage device A. A water intake port 4 is provided at the bottom of the container 1 in a direction perpendicular to the cylindrical inner surface 3 to communicate the inside of the container and the cylindrical inner surface 3. A drain port 5 is provided in a direction perpendicular to the cylindrical inner surface 3 to communicate the cylindrical inner surface 3 with the atmosphere.

Reference numeral 6 denotes a drain element, which is separated from a cylindrical main body 6a that can be rotated in a tight fit with respect to the cylindrical inner surface 3, a small diameter portion 6b, and a short shaft 6c.

A blind water receiving hole 7 is bored in the cylindrical main body 6a, and the water receiving hole 7 can selectively communicate with the water intake port 4 and the drain port 5.

Fit the drain element 6 into the cylindrical inner surface 3, fit the bracket 9 with the bearing 8 into the small diameter part 6b, fix the bracket 9 to the container 1 with several bolts 10, and then attach the bundle 11 to the short shaft 6c. Install.

Since electrical equipment is built inside the container 1, it is insufficient for the drainage device of such a container to simply have a drainage function, and flames caused by an explosion inside the container 1 may escape to the outside. Functions to prevent this are also essential.

Specifically, in the case of electrical equipment for coal mines, it is regulated by the explosion-proof structure for electrical equipment for coal mines, and in the case of factory electrical equipment, it is regulated by the 1-1 Factory Electrical Equipment Explosion-proof Guidelines.

For both, allowable values for the plow (maximum gap between joint surfaces when no explosive pressure is applied internally) and plow depth (minimum length of the part with the plow) are established to prevent explosion pressure from leaking. For example, if the internal volume of the container is 2000c
When exceeding yj, the former has a plow of 0.3 mm or less (diameter difference), the plow depth is 25 mm or more, and the latter has a plow of 0.3 T.
rr! n or less (explosive class 1) or 0.2 mm or less (explosive class 2), and the depth of the plow is 25rrrIIL or more.

Applying the above standards to the embodiment of the present invention, the plow is d
(difference between the inner diameter of the cylindrical inner surface 3 and the outer diameter of the cylindrical main body 6a), then d≦0.3rIrln or d≦0.2r/r! I
t, 1□≧25kaku, 1゜≧25rIrIIX.

Rotate the ice scoop 6 to move the water receiving hole 7 from the position (I) to the position (II).
) (Figure 2),
The length of the arc from the outer edge of the lower end of the water intake port 4 to the outer edge of the water receiving hole 7 is 13, and the length of the arc from the outer edge of the water receiving hole 7 to the outer edge of the drain port 5 is 1. Then, if 13 is 25wn or less, the water receiving hole 7 located at the position (If) is evaluated to be internal, so 14 must be 25 mm or more.

Further, if 14 is less than 25 mm, water receiving hole 7 located at position (II) is evaluated as being external, so 13 must be 25 mm or more.

13=1. The most severe condition is when 13.
1. must each be 25 mm or more.

Since the present invention has a structure in which the drain element 6 having a cylindrical main body 6a is tightly fitted and slid on the cylindrical inner surface 3 of the drainage device,
By enclosing the bundle, not only can drainage work be carried out easily at any time, but also the length and diameter of the cylindrical main body 6a can be selected to appropriate dimensions to prevent the escape of flames caused by an explosion. The distance (plow depth) can be secured.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1...Container, 3...Cylindrical inner surface, 4...
...Water intake, 5...Drain port, 6...
・Drainer, 6a...Cylindrical main body, 7...
・Water receiving hole, A... Drainage device.

Claims (1)

[Scope of utility model registration request] A drainage device A is provided at the bottom of a container 1 containing electrical equipment,
A cylindrical inner surface 3 is formed inside the drainage device A, a water intake port 4 is provided in the upper part of the drainage device A, and a drainage port 5 is provided in the lower part of the drainage device A.
The cylindrical main body 6a of the drain element 6 is tightly fitted into the cylindrical inner surface 3, and by rotating the drain element 6, the blind water receiving hole 7 provided in the cylindrical main body 6a is connected to the water intake port 4 and the drain port 5. A drainage device for explosion-proof electrical equipment that is configured to selectively communicate with each other and can secure the length necessary to prevent the escape of flames due to an explosion.