JP4230266B2 - Switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an outdoor switch that opens and closes an electric circuit of a power distribution system in which an opening / closing part is housed in an airtight container.
[0002]
[Prior art]
In a switch that opens and closes an electrical circuit of a power distribution system in which a switch is housed in a container, when an arc is generated due to a short circuit accident or the like, a rapid pressure increase is generated by the arc energy. When the internal pressure becomes abnormally high due to arc energy due to a short-circuit current at the time of an accident, it is assumed that the container that houses the opening / closing part is ruptured and the housed parts are scattered around.
The structure of the switch is such that the internal pressure is released without rupturing the container against the pressure increase at the time of the internal accident so that the internal parts are not scattered at the time of the accident.
[0003]
The structure of a conventional pole switch is shown, for example, in FIG. In this configuration, the opening / closing part is housed inside the container, and a cover is provided on one surface of the container to release the pressure when the internal pressure increases. FIG. 2 shows the state of the pressure release operation of the cover part when the internal pressure is released.
In this configuration, the cover closes the opening of the container under normal use, and when an explosion such as an internal short circuit occurs in the pole switch, the cover closes the opening of the container. The part is configured to open and release the internal pressure.
[0004]
[Patent Document 1]
Microfilm of Japanese Utility Model No. 59-18375 (Japanese Utility Model Application No. 60-131937)
[0005]
[Problems to be solved by the invention]
The conventional pole switch has a structure in which the opening of the container is closed by a cover as described above, and when the internal pressure rises due to an internal accident of the pole switch, the cover floats up. Although it is configured to release pressure and avoid an abnormal increase in internal pressure, the part where the packing of the opening of the container is loaded is a welded structure, and the packing presser that holds the packing of the cover is also a welded structure. This structure is complicated and requires time for processing. In addition, there is a problem that a leakage test of the welded portion is necessary and the production cost becomes high.
Further, the outer peripheral side of the packing is exposed to the outside air, and there is a problem that the packing is likely to deteriorate.
[0006]
The present invention has been made in order to solve the above-mentioned problems, and has an object to provide a switch having a structure in which the welded portion of the container is eliminated and the manufacturing cost is reduced, and the packing portion is not exposed to wind and rain. To do.
[0007]
[Means for Solving the Problems]
The switch according to the present invention has an upper container and a lower container , both of which are made of press-molded products , facing the structure of the container. The upper container is formed in a bowl shape with the opening side facing downward, and the edge on the opening side is formed. A packing surface is formed by bending the outer peripheral side at a right angle to form a cylindrical packing guard by bending downward from the outer peripheral portion of the packing surface, and a flange is formed by bending the lower end edge of the packing guard in the outer peripheral direction. The lower container is formed in a bowl shape, with the opening facing upward so as to face the opening side of the upper container, and the edge on the opening side of the outer periphery so as to face the packing surface of the upper container Folded in the direction to form a packing surface, bent downward from the outer periphery of the packing surface so as to enter the inside of the packing guard of the upper container to form a cylindrical packing guard, and the lower end edge of the packing guard was Bending is formed in a circumferential direction, the upper container and the lower container have packing surfaces facing each other, and packing is loaded between the packing surfaces of the upper container and the lower container, and each of the upper container and the lower container The fastening parts of the upper container and the lower container are not deformed by the pressure of the insulating medium filled in the switch, and the gap between the two fastening members is not changed in the switch. When a short circuit accident occurs and the internal pressure rises, the gap is set such that a gap is generated between the packing joint surfaces of the upper and lower containers .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a perspective view showing the overall configuration of a switch that is an object of the present invention, and FIG. 2 is a sectional view of a container portion of the switch. This switch has a configuration in which the opening side of the upper container 2 and the lower container 3 formed in a bowl shape is opposed to each other, and a three-phase bushing 6 is attached to both opposing sides of the upper container 2, In the configuration, the opening / closing part 1 is accommodated. An opening / closing operation handle 4 is provided on the side of the upper container 2. The external connection conductor 7 connected to the external electric circuit is configured to be crimped to the center conductor inside the bushing.
[0009]
As shown in FIG. 2, the upper container 2 and the lower container 3 are formed in a bowl shape, the openings of the upper container 2 and the lower container 3 are opposed to each other, the upper container 2 has the opening side facing downward, and the edge of the opening side Is folded in the direction perpendicular to the outer peripheral side to form a packing surface 2a, bent downward from the outer peripheral portion of the packing surface 2a to form a cylindrical packing guard 2b, and the lower end edge of the packing guard 2b is bent in the outer peripheral direction. The lower container 3 is formed in a bowl shape with the opening facing upward so as to face the opening side of the upper container 2, and the opening is formed so as to face the packing surface 2 a of the upper container 2. The side edge is bent in the outer circumferential direction to form a packing surface 3a, and the cylindrical packing guard 3b is formed by bending downward from the outer peripheral portion of the packing surface 3a so as to enter the inside of the packing guard 2b of the upper container 2. This The bottom edge of the packing guard 3b is bent in the outer circumferential direction to form a flange 3c. The upper container 2 and the lower container 3 have the packing surfaces 2a and 3a facing each other, and the packing surface 2a of the upper container 2 and the lower container 3 The packing 5 is loaded between the packing surfaces 3a, and the flanges 2c and 3c of the upper container 2 and the lower container 3 are fastened by fastening members 8 at appropriate intervals.
[0010]
If the upper container 2 and the lower container 3 are configured in such a shape, they can be formed by pressing a thin steel plate, and a complicated process such as welding is eliminated, and a lightweight and highly workable container can be configured.
[0011]
The interval between the fastening members 8 is based on the relationship between the rigidity of the upper container 2 and the lower container 3 and the internal pressure at the time of short circuit, and there is no gap in the normal use state. The interval to be set is set.
In the switch configured as described above, when a short circuit accident occurs, the internal pressure increases, and as shown in FIG. 3, the upper container 2 and the lower container 3 are deformed to form a gap in the portion of the packing 5, and the internal pressure is increased. The upper container 2 and the lower container 3 are combined and the internal components are not discharged from the container to the surroundings.
[0012]
The part of the packing guard 2b of the upper container 2 guards the packing 5 arranged on the packing surface 2a of the upper container 2, and the packing 5 is in a state of being combined with the packing guard 3b of the lower container 3. Protects from surrounding UV rays and suppresses deterioration of packing. Furthermore, even if the pressure in the container rises and there is a gap in the portion of the packing 5, it does not open greatly, and components inside the container are not released to the outside.
[0013]
When the upper container 2 and the lower container 3 are configured as shown in FIG. 2, the rigidity in the vicinity of the packing surface is increased by the packing guards 2 b and 3 b, and the pressure release operation is performed with respect to the pressure in the upper container 2 and the lower container 3. The pressure can be easily set.
[0014]
【The invention's effect】
The switch according to the present invention is formed by pressing the upper and lower containers constituting the container by pressing a thin plate. Even if the switch is formed of a thin plate, it has appropriate rigidity in a normal use state, and the internal pressure is low. A container that can be easily deformed when the height is increased can be configured, the packing is protected from ultraviolet rays, and the weight of the container can be reduced, so that the container can be manufactured at a low cost.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall structure of a switch that is an object of the present invention.
FIG. 2 is a cross-sectional view of a container portion of a switch that is an object of the present invention.
FIG. 3 is a cross-sectional view showing a deformation state of the container when a short circuit accident occurs in the switch.
[Explanation of symbols]
1 Opening / closing part, 2 Upper container, 3 Lower container, 5 Packing, 6 Bushing, 8 Fastening bolt.

Claims (1)

In a switch in which an opening / closing part is accommodated in a container, the container is opposed to an upper container and a lower container made of a press-molded product, and the upper container is formed in a bowl shape with the opening side facing downward, Side edge is bent in the direction perpendicular to the outer peripheral side to form a packing surface, bent downward from the outer periphery of the packing surface to form a cylindrical packing guard, and the lower end edge of the packing guard is bent in the outer peripheral direction. The lower container is formed in the shape of a bowl and has an opening on the opening side so as to face the opening side of the upper container, and on the opening side so as to face the packing surface of the upper container. The packing portion is bent in the outer peripheral direction to form a packing surface, and is bent downward from the outer peripheral portion of the packing surface to enter the packing guard of the upper container to form a cylindrical packing guard. The lower end edge of the guard is bent in the outer circumferential direction to form a ridge, the upper container and the lower container face the packing surface, the packing is loaded between the packing surfaces of the upper container and the lower container, The respective flange portions of the container and the lower container are fastened by fastening members, and the deformation of the packing joint surfaces of the upper container and the lower container is deformed between the fastening members by the pressure of the insulating medium filled in the switch. The switch is characterized in that it is set at an interval that creates a gap in the packing joint surfaces of the upper and lower containers when a short circuit accident occurs in the switch and the internal pressure rises .

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