JP4279478B2 - Insulation barrier structure of switch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulating barrier structure for a switch.
[0002]
[Prior art]
As an insulating barrier structure of a switch, for example, as shown in Japanese Utility Model Publication No. 6-74008, a side insulating barrier is sandwiched between an upper insulating barrier and a bottom insulating barrier fixed to a main body case. There is. When attaching each insulation barrier to the main body case of the switch, first, the lower insulation barrier is fixed to the inner bottom surface of the main body case with bolts, and then the engagement protrusions formed on the upper surface of the lower insulation barrier. Insert the lower edge of the side insulating barrier into the engaging groove. Next, the upper insulating barrier is fixed to the fixing portion of the main body case with the bolt in a state where the engaging groove of the upper insulating barrier is engaged with the engaging protrusion formed on the upper side of the side insulating barrier.
[0003]
[Problems to be solved by the invention]
However, the insulation barrier structure of the conventional switch has the following problems. That is, the side insulating barrier is disposed so as to be orthogonal to the upper surface of the bottom insulating barrier. For this reason, a gap may be formed between the side insulating barrier and the bottom insulating barrier due to the straightness tolerance of the lower edge of the side insulating barrier and the flatness tolerance of the upper surface of the bottom barrier. And if a gap is formed between the interphase barrier and the bottom barrier, insulation between the ground and between the different phases cannot be ensured, and there is a possibility that discharge occurs. This becomes conspicuous with downsizing.
[0004]
Further, the bottom insulating barrier and the upper insulating barrier are directly fixed to the main body case with bolts or the like. For this reason, there has been a problem that the assembling work of the insulation barrier becomes complicated and the assembling work efficiency is lowered.
[0005]
The present invention has been made to solve the above problems, and a first object thereof is to provide a barrier structure of a switch that can secure insulation between the ground and different phases even if it is downsized. There is to do.
[0006]
A second object of the present invention is to provide a barrier structure for a switch that can improve the assembly work efficiency.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, in contrast to the bottom-to-ground insulation barrier formed in a U shape so as to cover the inner bottom surface of the main body case, the side-to-ground insulation barrier and the different phase formed in a plate shape respectively. In the insulation barrier structure of a switch to which an insulation barrier is attached, the mounting correspondence positions of the side-to-ground insulation barrier and the inter-phase insulation barrier in the bottom-to-ground insulation barrier formed in the U shape are respectively And a creeping distance increasing structure for increasing the creeping distance between different phases, and the creeping distance increasing structure extends in the same phase direction along the inner peripheral surface of the bottom-to-ground insulating barrier formed in the U-shape. A plurality of formed partition walls, and each partition wall is formed over the entire length of the partition wall and a groove formed so that the lower end edge of the side-to-ground insulation barrier and the inter-phase insulation barrier can be respectively inserted. Preparation It and its gist.
[0008]
According to a second aspect of the present invention, in the first aspect of the invention, the power supply side bushing and the load side bushing facing each phase are penetrated and supported on the inner wall of the main body case, and the bottom-to-ground insulation barrier is provided. The power supply side engaging recess and the load side engaging recess are formed on both side edges in the in-phase direction so as to engage the power supply side bushing and the load side bushing facing each phase. And
[0009]
( Function)
In the first aspect of the present invention, the creepage distance between the ground and the different phases increases. That is, even if the entire switch is downsized, the decrease in the insulation performance due to the shortening of the insulation distance between the ground and the different phases is compensated by the increase of the creeping distance between the ground and the different phases. Further, the side-to-ground insulating barrier and the inter-phase insulating barrier are fixed to the bottom-to-ground insulating barrier only by inserting the lower end edges of the side-to-ground insulating barrier and the different-phase insulating barrier into the grooves of the respective partition walls.
[0010]
In the invention according to claim 2, in addition to the action of the invention according to claim 1, the upward movement of the bottom-to-ground insulation barrier is restricted in the main body case.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in an insulating barrier structure of a switch will be described with reference to FIGS.
[0013]
(overall structure)
As shown in FIGS. 1 and 2, the main body case 12 of the switch 11 includes a bottomed box-shaped bottom case 12 a having an open top and a covered box-shaped top case 12 b having an open bottom. The upper opening of the bottom case 12a is closed by the upper case 12b. A packing 14 is interposed between the bottom case 12a and the upper case 12b, and thereby the airtightness of the switch 11 is secured.
[0014]
On both side walls of the bottom case 12a facing each other, a power supply side bushing 21 and a load side bushing 22 are penetrated and supported so as to face each other for each of the three phases (only one phase is shown in FIG. 1).
[0015]
A fixed electrode 24 is fixed to an inner end portion of the power supply side bushing 21 via a power supply side conductive rod 23, and an arc extinguishing member 25 made of synthetic resin is provided so as to cover the fixed electrode 24. A support member 26 having an L-shaped cross section is fixed to the inner end portion of the power supply side bushing 21 in a state of being inserted through the power supply side conductive rod 23. The base end portion of the side arc electrode 27 is screwed.
[0016]
A movable electrode support member 29 is fixed to the inner end portion of the load side bushing 22 by a bolt via a load side conductive rod 28, and a movable electrode 31 is connected to the distal end side of the movable electrode support member 29 via a shaft 30. The base end part of is supported so that rotation is possible. The movable electrode 31 is composed of a single sickle-shaped contact blade. A load-side arc electrode 32 is fastened and fixed to the upper surface of the load-side conductive rod 28 with the movable electrode support member 29 and the bolt. In FIG. 2, the position of the load side arc electrode 32 is indicated by hatching for only one phase (the rightmost phase in FIG. 2).
[0017]
On the other hand, in the main body case 12, a rotating shaft 43 operatively connected to an operation handle 42 outside the main body case 12 is provided above the inner end of the load side bushing 22 via an opening / closing mechanism 41 composed of a plurality of links. Is provided. The rotating shaft 43 is operatively connected to the movable electrode 31 through a lever 44, a drive link 45, and a connecting member 46. Accordingly, by operating the operation handle 42, the movable electrode 31 moves between a closing position indicated by a solid line and an open position indicated by a two-dot chain line in FIG.
[0018]
(Arrester mounting member)
As shown in FIGS. 1 and 2, an arrester mounting member 51 is disposed above the inner end of the power supply side bushing 21 in the main body case 12. The arrester mounting member 51 is fixed to the inner surface of the main body case 12 via a fixing member 52. The arrester mounting member 51 is formed with an inclined surface 53 inclined downward by a predetermined angle, and a base end portion of a lightning arrester 54 is fixed to the inclined surface 53 for each phase with a bolt. The tip charging portion of the lightning arrester 54 is connected to the upper surface of the support member 26 via a conductive member 55.
[0019]
(Splashing prevention member)
As shown in FIGS. 1 and 2, a scattered matter preventing member 61 is disposed between the inner surface of the upper case 12 b and the arrester mounting member 51. The scattered matter preventing member 61 is formed in a helmet shape that covers the entire inner surface of the upper case 12b, and is fixed to the arrester mounting member 51 with bolts. That is, the scattered matter preventing member 61 is fixed to the main body case 12 via the arrester mounting member 51.
[0020]
(Insulation barrier)
As shown in FIGS. 1 and 2, an insulating barrier 71 is disposed in the body case 12, and the insulating barrier 71 includes a bottom-to-ground insulating barrier 72, two side-to-ground insulating barriers 73, and Two interphase insulating barriers 74 are provided. The insulating barrier 71 is made of a synthetic resin material having insulating properties and flame retardancy, such as unsaturated polyester, polypropylene, and polyamide.
[0021]
(Bottom-to-ground insulation barrier)
As shown in FIGS. 1 and 3, the bottom-to-ground insulation barrier 72 is formed in a U shape along the inner bottom surface of the bottom case 12a. That is, both side edges in the in-phase direction of the bottom-to-ground insulating barrier 72 extend upward along the inner surfaces of both bushing fixing walls of the bottom case 12a.
[0022]
As shown in FIG. 6, three arc-shaped power-side engagement recesses 75 and load-side engagement recesses 76 are formed on both side edges of the bottom-to-ground insulation barrier 72 in the in-phase direction. Each power supply side engagement recess 75 and each load side engagement recess 76 correspond to the power supply side bushing 21 and the load side bushing 22 of each phase, respectively, and the power supply side bushing 21 and the load side bushing 22. It is formed along the outer peripheral surface.
[0023]
(Creepage distance increasing structure)
As shown in FIGS. 4 and 5, the side-to-ground insulation barriers 73 are located at the mounting corresponding positions of the side-to-ground insulation barriers 73 and 73 and the two-phase insulation barriers 74 and 74 in the bottom-to-ground insulation barrier 72. 73 and both-phase insulating barriers 74, 74 are attached. In the present embodiment, the attachment corresponding positions of the side-to-ground insulating barriers 73 and 73 are both side edges of the bottom-to-ground insulating barrier 72 in the different phase direction. The mounting corresponding positions of the two-phase insulation barriers 74 and 74 are the same between the load-side engagement recesses 76 and 76 in the bottom-to-ground insulation barrier 72 as in the center between the two power-side engagement recesses 75 and 75 adjacent to each other. This is a portion including a line segment that connects the center of the bottom and the top surface of the bottom-to-ground insulation barrier 72.
[0024]
On the top surface of the bottom-to-ground insulation barrier 72, a partition wall 77 having a predetermined height and a predetermined width is formed at each of the attachment corresponding positions so as to extend in the in-phase direction. In the center of the line end surface of the partition wall 77, a groove 78 that allows the lower end edges of the both-side insulating barriers 73, 73 and the lower end edges of both-phase insulating barriers 74, 74 to be fitted respectively extends over the entire length of the partition wall 77. Is formed. Even if a gap is formed between the lower end edge of the side-to-ground insulating barrier 73 and the lower end edge of the bottom-to-ground insulating barrier 72 and the innermost part of the groove 78, the insulation between the ground and different phases is not caused. The width of the partition wall 77, the height of the partition wall 77 from the top surface of the insulation barrier 72 between the ground, and the depth of the groove 78 are set to such an extent that they are secured.
[0025]
As shown in FIGS. 4 and 5, the groove 78 is formed in a tapered shape that expands toward the distal end surface of the partition wall 77, that is, in a V-shaped cross section. On the front end face of the partition wall 77, the width of the groove 78 is slightly larger than the thickness of the side-to-ground insulating barrier 73 and the thickness of the inter-phase insulating barrier 74. The width at the innermost portion of the groove 78 is slightly smaller than the thickness of the side-to-ground insulating barrier 73 and the thickness of the inter-phase insulating barrier 74.
[0026]
As shown in FIGS. 3 and 5, hemispherical support protrusions 79 are formed at the four corners of the bottom surface of the bottom-to-ground insulating barrier 72, respectively. Therefore, when the insulating barrier 71 is placed in the bottom case 12a, a gap corresponding to the height of each support protrusion 79 is formed between the inner bottom surface of the bottom case 12a and the bottom surface of the insulating barrier 71. .
[0027]
(Side-to-ground insulation barrier / different-phase insulation barrier)
As shown in FIG. 6, the side-to-ground insulation barrier 73 and the inter-phase insulation barrier 74 are each formed in a plate shape, and are inserted into the grooves 78 of the partition walls 77 from above the bottom-to-ground insulation barrier 72. ing. The corners of the lower edges of the side-to-ground insulation barrier 73 and the out-of-phase insulation barrier 74 are each formed in an arc shape, whereby the side-to-ground insulation barrier 73 and the out-of-phase insulation barrier 74 are formed in the groove 78. It can be inserted. Further, a U-shaped recess 73 a is formed on the upper edge load side of the side-to-ground insulation barrier 73. In a state where the insulating barrier 71 is disposed in the bottom case 12a, the rotating shaft 43 is positioned in a non-contact state in the recess 73a.
[0028]
(Disposition state)
As shown in FIGS. 1 and 2, the insulation barrier 71 is configured such that the lower surfaces of the power supply side bushings 21 and the load side bushings 22 engage with the power supply side engagement recesses 75 and the load side engagement recesses 76, respectively. Is disposed in the bottom case 12a. In addition, between the side-to-ground insulating barrier 73 and the adjacent inter-phase insulating barrier 74 and between the different-phase insulating barriers 74, the power supply side bushing 21 inner end portion and the load side bushing 22 inner end portion of each phase, respectively. The insulating barrier 71 is disposed in the bottom case 12a so that the fixed electrode 24 and the movable electrode 31 are positioned.
[0029]
Each partition wall 77 constitutes a creeping distance increasing structure that increases the creeping distance between the ground and between different phases. The groove 78 constitutes a fitting structure that allows the partition wall 77, the side-to-ground insulating barrier 73, and the inter-phase insulating barrier 74 to be fitted to each other.
[0030]
(Insulation barrier assembly procedure)
Next, a procedure for assembling the insulating barrier 71 will be described.
First, the bottom-to-ground insulation barrier 72 is placed in the bottom case 12a. Then, the power-side bushing 21 and the load-side bushing 22 on which the power-side conductive rod 23 and the load-side conductive rod 28 are projected are respectively supported by being penetrated into the bottom case 12a. The power supply side bushing 21 and the load side bushing 22 have an inner end lower surface through a packing (not shown) made of a rubber material in close contact with the circumference of each bushing 21, 22. The side engagement recess 75 and the load side engagement recess 76 are engaged. This restricts the upward movement of the bottom-to-ground insulation barrier 72 in the main body case 12.
[0031]
Next, the support member 26, the fixed electrode 24, the arc extinguishing member 25, and the like are assembled to the power supply side conductive rod 23. Further, the load side arc electrode 32, the movable electrode support member 29, the movable electrode 31, etc. are assembled to the load side conductive rod 28. A connecting member 46 is assembled in advance to the movable electrode 31.
[0032]
Next, both side-to-ground insulation barriers 73 and 73 and both-phase insulation barriers 74 and 74 are respectively inserted into the grooves 78 of the partition walls 77 from above. As a result, both side-to-ground insulating barriers 73 and 73 and both-phase insulating barriers 74 and 74 are fixed to the bottom-to-ground insulating barrier 72, respectively. The creepage distance between the ground and between different phases is increased by the plurality of partition walls 77 and the grooves 78 of the partition walls 77. For this reason, it is slightly between the lower end edge of the both-sides insulation barriers 73 and 73 and the inner bottom surface of the groove 78, and between the lower edge of both-phase insulation barriers 74 and 74 and the inner bottom surface of the groove 78, respectively. Even when the gap is formed, insulation between the ground and between different phases is ensured. Therefore, in the main body case 12, the insulation performance between the ground and different phases is improved.
[0033]
Next, the arrester mounting member 51 to which the lightning arrester 54 is fixed is fixed to the bottom case 12 a via the fixing member 52. Then, one end of the conductive member 55 is fixed to the front charging portion of the lightning arrester 54 with a bolt (not shown), and the other end of the conductive member 55 is screwed to the upper surface of the support member 26 and the base end portion of the power-side arc electrode 27 is screwed. Fix by joining.
[0034]
Next, via a bearing member (not shown) fixed to the inner surface of the bottom case 12a, the rotary shaft 43, to which the lever 44 is fixed so as to be integrally rotatable, can be rotated to the upper part in the bottom case 12a. To support. Then, the driving link 45 connects the tip of the lever 44 and the tip of the connecting member 46. Finally, the scattered matter preventing member 61 is fixed to the arrester mounting member 51 with bolts, and the upper case 12b is fixed to the bottom case 12a via the packing 14. Thus, the assembly work inside the switch 11 is completed.
[0035]
(Effect of embodiment)
Therefore, according to the present embodiment, the following effects can be obtained.
(1) The creeping distance increasing structure for increasing the creeping distance between the ground and between the different phases is provided at the mounting corresponding position of the side-to-ground insulating barrier 73 and the different-phase insulating barrier 74 in the bottom-to-ground insulating barrier 72, respectively. Then, the side-to-ground insulating barrier 73 and the inter-phase insulating barrier 74 are attached to each creeping distance increasing structure. For this reason, the decrease in the insulation performance due to the shortening of the insulation distance between the ground and the different phases with the miniaturization of the entire switch is compensated by the increase of the creeping distance between the ground and the different phases. Therefore, even if the entire switch is downsized, it is possible to ensure insulation between the ground and between different phases.
[0036]
(2) The partition walls 77 are formed at the positions corresponding to the side-to-ground insulation barrier 73 and the inter-phase insulation barrier 74 in the bottom-to-ground insulation barrier 72 so as to extend in the in-phase direction. Then, a groove 78 in which the side-to-ground insulating barrier 73 and the inter-phase insulating barrier 74 can be inserted is formed at the center of the front end surface of the partition wall 77. Therefore, the side-to-ground insulation barrier 73 and the out-of-phase insulation barrier 74 are simply inserted into the groove 78, respectively, so that the side-to-ground insulation barrier 73 and the bottom-to-ground insulation barrier 74 are provided with the bottom-to-ground insulation barrier 72. Fixed against. Therefore, the assembling work of the insulating barrier 71 is simplified. As a result, the assembly work efficiency of the insulation barrier 71 is improved. Further, even if a gap is formed between the lower edge of the side-to-ground insulating barrier 73 and the lower edge of the bottom-to-ground insulating barrier 72 and the innermost part of the groove 78, insulation between the ground and between different phases is ensured. The occurrence of discharge is prevented.
[0037]
(3) The groove 78 of the partition wall 77 is formed to have a tapered shape that expands toward the front end surface of the partition wall 77. For this reason, for example, compared with the case where the width of the groove 78 is constant, the side-to-ground insulating barrier 73 and the inter-phase insulating barrier 74 can be easily inserted into the groove 78. Therefore, the assembly work efficiency of the insulation barrier 71 can be improved.
[0038]
(Another example)
In addition, you may implement the said embodiment as follows.
In the present embodiment, the groove 78 is formed in the partition wall 77, and the side-to-ground insulation barrier 73 and the inter-phase insulation barrier 74 are fitted into the groove 78. The concavo-convex relationship between the lower end edge of the inter-layer insulating barrier 73 and the lower end edge of the inter-phase insulating barrier 74 may be reversed. That is, grooves are formed in the lower end edge of the side-to-ground insulation barrier 73 and the lower end edge of the inter-phase insulation barrier 74 so that the partition wall 77 can be inserted from above. The groove formed in the lower end edge of the side-to-ground insulating barrier 73 and the lower end edge of the inter-phase insulating barrier 74 enables the partition wall 77 and the side-to-ground insulating barrier 73 and the out-of-phase insulating barrier 74 to be fitted to each other. Configure the fitting structure. The groove 78 can be omitted.
[0039]
In the present embodiment, the groove 78 is formed in a V-shaped cross section, but may be formed in an arbitrary shape such as a rectangular cross section.
Even if a gap is formed between the lower end edge of the side-to-ground insulating barrier 73 and the lower end edge of the bottom-to-ground insulating barrier 72 and the innermost part of the groove 78, insulation between the ground and different phases is ensured. If necessary, the width of the partition wall 77, the height of the partition wall 77 from the top surface of the bottom-to-ground insulating barrier 72, and the depth of the groove 78 may be arbitrarily changed.
[0040]
The thicknesses of the side-to-ground insulation barrier 73 and the inter-phase insulation barrier 74 may be arbitrarily changed. The width of the partition wall 77 and the width of the groove 78 are changed so as to correspond to the change in the thickness of the side-to-ground insulation barrier 73 and the out-of-phase insulation barrier 74.
[0041]
(Appendix)
Next, a technical idea that can be grasped from the embodiment and another example will be added below.
・ Bushings facing each phase are penetrated and supported on both side walls of the main body case. A fixed electrode is provided at the inner end of one bushing, and the fixed electrode is attached to and separated from the inner end of the other bushing. In a switch configured to provide movable electrodes corresponding to each other in a rotatable manner, and to cover both electrodes with an insulating barrier so as to insulate between the ground and different phases, the insulating barrier has an inner bottom surface of the main body case. A bottom-to-ground insulating barrier, a side-to-ground insulating barrier that can be attached to the bottom-to-ground insulating barrier, and a different-phase insulating barrier; and a side-to-ground insulation in the bottom-to-ground insulating barrier. A creepage distance increasing structure that increases the creepage distance between the ground and between the different phases is provided at the mounting corresponding positions of the barrier and the different phase insulation barrier, and the side-to-ground insulation is provided for each creepage distance increasing structure. Switch that rear and heterophase insulating barrier to attach respectively.
[0042]
- formed in said partition wall groove, the insulating barrier structure of the switch according to claim 1 which is tapered to expanding toward the distal end surface of the partition wall.
[0043]
【The invention's effect】
According to the first aspect of the present invention, by increasing the creeping distance between the ground and between the different phases, insulation between the ground and between the different phases can be ensured even if the entire switch is downsized. Further, since the lower end edges of the side-to-ground insulating barrier and the inter-phase insulating barrier are merely inserted into the grooves of the respective partition walls, the assembling work efficiency can be improved.
[0044]
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the upward movement of the bottom-to-ground insulation barrier is restricted in the main body case.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a switch according to an embodiment.
FIG. 2 is a side sectional view of a switch according to the present embodiment.
FIG. 3 is a front view of a bottom-to-ground insulation barrier in the present embodiment.
4 is a sectional view taken along line 1-1 in FIG. 3;
FIG. 5 is a plan view of a bottom-to-ground insulation barrier in the present embodiment.
FIG. 6 is an exploded perspective view of an insulating barrier in the present embodiment.
[Explanation of symbols]
11 ... Switch, 12 ... Body case, 71 ... Insulation barrier,
72 ... Bottom-to-ground insulation barrier, 73 ... Side-to-ground insulation barrier,
74 ... Insulation barrier between different phases, 77 ... Partitions constituting the creeping distance increasing structure,
78 ... Grooves constituting the fitting structure.

Claims (2)

A switch to which side-to-ground insulation barriers and inter-phase insulation barriers each formed in a plate shape are attached to a bottom-to-ground insulation barrier formed in a U shape so as to cover the inner bottom surface of the main body case. In the insulation barrier structure of
In the U-shaped bottom-to-ground insulation barrier, a side-to-ground insulation barrier and a different-phase insulation barrier are installed at positions corresponding to the side-to-ground insulation barrier and a different creepage distance increasing structure for increasing the creepage distance between the ground and the different phases, respectively. ,
The creeping distance increasing structure includes a plurality of partitions formed to extend in an in-phase direction along an inner peripheral surface of the bottom-to-ground insulating barrier formed in the U shape, and each partition includes An insulating barrier structure for a switch, comprising a groove formed over the entire length and formed so that the lower end edges of the side-to-ground insulating barrier and the inter-phase insulating barrier can be respectively inserted thereinto. The power supply side bushing and the load side bushing that are opposed to each phase are penetrated and supported on the inner wall of the main body case, and the opposite side edges in the in-phase direction of the bottom-to-ground insulation barrier are on the power supply side that is opposed to each phase. The insulating barrier structure for a switch according to claim 1 , wherein a power supply side engaging recess and a load side engaging recess are formed so as to engage the bushing and the load side bushing, respectively .

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