JP2002084607A - Switch and its insulating barrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch and its insulating barrier capable of preventing relative movement between insulating barriers provided for each phase. SOLUTION: A switch is designed to insulate between phases and the ground by passing and supporting bushings corresponding to each phase into both sides walls of a unit casing, by providing a fixed electrode on the inside edge of one bushing and a movable electrode, which is enable to contact or detach from the fixed electrode, on the inside edge of the other bushing in such a way as to be rotatable, and by covering both electrodes with insulating barriers. In this switch, recessed fitting parts 44 are formed on the one side 41a of the insulating barriers 41, and protruding fitting parts 45, which can be fitted into the recessed parts 44, on the other side 41b. Therefore, the fitting of the neighboring insulating barriers 41 into each other can prevent relative movement between each insulating barrier 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch for insulating between phases and ground by covering both electrodes and an insulation barrier for the switch.

[0002]

2. Description of the Related Art Conventionally, a fixed electrode and a movable electrode provided at the inner end of a bushing, which are opposed to each phase and supported on both side walls of a main body case, are covered for each phase so that the phases and the ground are covered. A switch which performs insulation between the switches and an insulation barrier thereof are known.

[0003]

However, in the above-described conventional switch and its insulation barrier, the connection between the insulation barriers has not been sufficiently established. For this reason, at the time of opening, there was a problem that the installation positions of the insulating barriers were relatively displaced by the violent movement of the movable electrode and the opening / closing mechanism for rotating the movable electrode.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a switch capable of preventing relative movement between insulating barriers provided for each phase and a switch therefor. It is to provide an insulating barrier.

[0005]

According to a first aspect of the present invention, bushings opposed to each other for each phase are penetrated and supported on both side walls of a main body case, and a fixed electrode is provided at an inner end of one of the bushings. At the inner end of the other bushing, a movable electrode corresponding to the fixed electrode is rotatably provided so as to be able to contact and separate from the fixed electrode, and insulation between phases and ground is performed by covering both electrodes for each phase. In the insulation barrier of the switch,
The gist of the present invention is to provide an engaging means for preventing relative movement between insulating barriers adjacent to each other.

According to a second aspect of the present invention, in the first aspect of the present invention, the engaging means are formed on both side surfaces of the insulating barrier facing each other in a direction between different phases, and can be engaged with each other. The gist of the present invention is that it is a concave portion or a convex portion.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the gist includes a connecting member for connecting the insulating barriers to each other. According to a fourth aspect of the present invention, in the third aspect of the present invention, the connecting member is formed in a long shape by using a synthetic resin material having an insulating property.
The gist is that a plurality of convex portions or concave portions that can be fitted to concave portions or convex portions respectively formed on the upper surface or the lower surface of each insulating barrier are arranged and formed along the longitudinal direction.

According to a fifth aspect of the present invention, opposed bushings for each phase are penetrated and supported on both side walls of the main body case, and a fixed electrode is provided at the inner end of one bushing and the other bushing is provided with a fixed electrode. At the end, a movable electrode corresponding to the fixed electrode is rotatably provided so as to be able to contact and separate from the fixed electrode, and by covering both electrodes with an insulating barrier, the switch is designed to insulate between phases and ground. The gist is that a protrusion or a recess is provided on one side surface of the insulating barrier, and a recess or a protrusion is provided on the other side surface so as to be engageable with the protrusion or the recess. (Operation) In the invention described in claim 1, the insulating barriers adjacent to each other engage with each other.

According to a second aspect of the present invention, in addition to the operation of the first aspect, in the insulating barriers adjacent to each other in the direction between different phases, a concave portion or a convex portion on one side surface and a facing portion thereof are provided. The protrusions or recesses on the other side face of the adjacent insulating barrier that engages with each other engage.

According to a third aspect of the present invention, in addition to the operation of the first or second aspect, the insulating barriers are connected to each other. In the invention described in claim 4, in addition to the effect of the invention described in claim 3, a plurality of protrusions or recesses of the connecting member are respectively provided with respect to the recesses or protrusions on the upper surface or the lower surface of each insulation barrier. Mated.

[0011] In the fifth aspect of the present invention, the convex or concave portion on one side surface of the insulating barrier engages with the convex or concave portion on the other side surface of the adjacent insulating barrier.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a switch and its insulating barrier will be described below with reference to FIGS. (Overall Configuration) As shown in FIG. 1, the case of the switch 11 includes a box-shaped main body case 12 having an open lower part, and a box-shaped bottom case 13 having an open upper part.
The lower opening of the main body case 12 is closed by a bottom case 13. That is, the fastening piece 14 provided on the opening side edge of the bottom case 13 is fastened to the connecting piece 15 provided on the opening side edge of the main body case 12 with the bolt 16 and the nut 17, so that the bottom case 13 Is the body case 12
Are connected detachably. A packing 18 is interposed between the main body case 12 and the bottom case 13, thereby maintaining the airtightness of the switch 11.

A power supply side bushing 21 and a load side bushing 22 are provided on both side walls of the main body case 12 facing each other.
Are supported so as to face each other in each of the three phases (only one phase is shown in FIG. 1). A rod-shaped fixed electrode 23 is fixed to the inner end of the power supply side bushing 21. A support member 24 is provided at the inner end of the load side bushing 22.
Is fixed, and the base end of the movable electrode 26 is rotatably supported by the support member 24 via a shaft 25. The movable electrode 26 is composed of a pair of contact blades arranged in parallel (only one contact blade is shown in FIG. 1).

On the other hand, a rotating shaft operatively connected to an operation handle (not shown) outside the main body case 12 via an opening / closing mechanism (not shown) comprising a plurality of links and the like is provided at an upper portion in the main body case 12. A lever 28 is fixed to the rotating shaft 27 so as to be integrally rotatable. Lever 2
One end of a drive link 29 is rotatably connected to the distal end of 8, and the other end of the drive link 29 is rotatably connected near the center of the movable electrode 26. Therefore, when the operation handle is operated, the movable electrode 26 is opened and closed by the opening and closing mechanism,
1 through a rotary shaft 27, a lever 28 and a drive link 29, between a closing position indicated by a solid line in FIG. 1 and an open position indicated by a two-dot chain line in FIG. (Interior Component Support) As shown in FIGS. 2 and 3, an interior component support (hereinafter, referred to as “support”) 31 is attached to each bushing penetration portion 12 a of the main body case 12. The support member 31 is integrally formed of an insulating and elastic synthetic resin material such as EPDM, and includes a cylindrical support portion 31a, a seal portion 31b, and an urging portion 31c. The outer diameter of the support portion 31a is the bushing penetration portion 1.
The inner diameter of the bushings 21 and 22 is larger than that of the flanges 21a and 22a. Seal part 31
“b” protrudes from the outer periphery of one end of the support portion 31a so as to form an annular shape. The urging portion 31c is provided so as to protrude so as to form a truncated cone on the inner end side of the seal portion 31b on the outer periphery of the support portion 31a. The seal portion 31b and the urging portion 31c are separated by a distance corresponding to the thickness of the side wall of the main body case 12, and the outer peripheral portion of the support portion 31a, the sealing portion 31b and the urging portion 31c constitute an attachment recess 32. Have been.

As shown in FIG. 3, an opening edge of the bushing penetrating portion 12a in the main body case 12 is interposed in the mounting concave portion 32. That is, the opening edge (inner edge) of the bushing penetration portion 12a is covered with an insulating synthetic resin material such as EPDM. Each of the bushings 21 and 22 includes a support 31 attached to the bushing penetrating portion 12a.
Is inserted through the support portion 31a. As shown in FIG.
A plurality of bolts 33 are provided upright on the outer surface of the side wall of the main body case 12 near the bushing penetration portion 12a. A flange presser fitting 34 that covers the flanges 21 a and 22 a of the bushings 21 and 22 is inserted into each bolt 33, and the bushings 21 and 22 are fixed to the main body case 12 by tightening nuts 35 from the outside. Have been.

As shown in FIGS. 2 and 3, the seal portion 31b of the support member 31 is provided with a flange 2 of each bushing 21, 22.
It is sandwiched between 1a, 22a and the outer surface of the side wall of the main body case 12, whereby the airtightness inside and outside the main body case 12 is maintained. A zero-phase current transformer 36 in a case is fitted on the inner end of the power supply-side bushing 21, and a cut-off relay 37 is fitted on the inner end of the load-side bushing 22. That is, the cased zero-phase current transformer 36 and the cut-off relay 37 have bushing insertion holes 36 corresponding to the three-phase power supply side and load side bushings 21 and 22, respectively.
a and 37a (only one phase is shown in FIGS. 2 and 3). The power supply side and load side bushings 21 are inserted into both bushing insertion holes 36a, 37a.
The inner end side of the support 22 and the inner end side of the biasing portion 31c of the support portion 31a are inserted.

As shown in FIG. 1, an insulating barrier 41, which will be described later, is disposed between the cased zero-phase current transformer 36 and the cutoff relay 37. Zero-phase current transformer with case 3
6 and the cut-off relay 37 are pressed toward the urging portion 31c by a pair of side walls opposed to each other in the in-phase direction of the insulating barrier 41, respectively.
Is always urged inward of the main body case 12. That is, in the cased zero-phase current transformer 36 and the cut-off relay 37, the insulating barrier 41 is
2, the bushings 21 and 22 are held at the inner ends of the bushings 21 and 22 at a predetermined holding pressure. In other words, the cased zero-phase current transformer 36 and the cut-off relay 37 are each positioned by the insulating barrier 41. (Insulation Barrier) As shown in FIG. 1 and FIG. 4, an insulation barrier 41 as a support means is independently disposed in the main body case 12 for each phase (only one phase is shown in FIG. 1). ing. The insulating barrier 41 is formed by injection molding a synthetic resin having an insulating property such as an unsaturated polyester resin. As shown in FIGS.
The insulating barrier 41 is formed in a box shape with a bottom covering the electrodes 23 and 26 from below, and has an upper surface opened and a pair of side walls 41a and 41b facing each other in a different phase direction extending upward. I have. Further, a pair of side walls 41c facing each other in a direction orthogonal to the interphase direction,
Recesses 42 and 43 are formed in the upper part of 41d along the outer peripheral surfaces of both bushings 21 and 22, respectively.
The insulating barrier 41 is arranged so that the bushings 21, 22 and the electrodes 23, 26 for each phase are located between the side walls 41a, 41b, and the lower surfaces of the bushings 21, 22 are engaged with the recesses 42, 43. I agree.

(Engaging Means) As shown in FIG. 5, in a pair of side walls 41a and 41b facing each other in a direction between different phases of the insulating barrier 41, three engaging recesses 44 are formed in one side wall 41a in an inverted triangular shape. It is arranged and formed. As shown in FIG. 6, three engaging projections 45 are formed in the other side wall 41b in an inverted triangular shape. As shown in FIG. 4, each insulating barrier 4 in the main body case 12 is formed.
In the installation state of No. 1, the side walls 41a, 4 adjacent to each other
The engaging concave portion 44 and the engaging convex portion 45 of 1b are engaged with each other. That is, as shown in FIG. 7, the engagement convex portion 45 is located in the engagement concave portion 44, so that each of the insulating barriers 4.
The movement in the direction along the side walls 41a and 41b of the first side is prevented.

(Connecting Member) As shown in FIGS. 4 and 8,
Each of the insulating barriers 41 has a cylindrical fitting portion 46 protruding from the outer surface of the bottom wall. As shown in FIGS. 1 and 4,
Each insulating barrier 41 has a connecting member 4
7 are connected to each other by being mounted. That is, the connecting member 47 is formed in an elongated shape with a synthetic resin having an insulating property, and the connecting member 47 has three fitting holes 4.
7a is each fitting portion 4 in each insulating barrier 41 in the installed state.
6 are arranged and formed so as to have the same interval as the interval between different phases. Then, each fitting portion 4 is inserted into each fitting hole 47a.
The insulating barriers 41 of each phase are connected to each other by fitting the respective 6. The thickness of the connecting member 47 is smaller than the height of the fitting portion 46 protruding from the outer surface of the bottom wall of the insulating barrier 41, and each fitting portion 46 protrudes from the lower surface of the mounted connecting member 47. The engaging recess 4
4, the engagement convex portion 45, each fitting portion 46, and the connecting member 47
An engaging means for preventing relative movement between the insulating barriers 41 adjacent to each other is constituted.

(Interference Prevention Member) As shown in FIGS. 1 and 4, an interference prevention member 48 is attached to a protruding portion of each fitting portion 46 from the lower surface of the connecting member 47. That is, the interference prevention member 48 is made of a rubber material having insulating properties and elasticity, and has a side section L.
It is formed in a letter shape and is formed so as to have an uneven relationship with the connecting member 47. Further, the through hole 48a is formed in the interference preventing member 48 at the same interval as each fitting hole 47a. Projecting portions of the respective fitting portions 46 from the lower surface of the connecting member 47 are fitted into the respective through holes 48a. When the interference prevention member 48 is attached,
6 is located inside each through hole 48a. The bottom surface of the interference prevention member 48 is in contact with the inner surface of the bottom case 13 so that each insulating barrier 41 and the bottom case 13
Interference with the inner surface of the vehicle is prevented.

(Peeping Window) As shown in FIGS. 1 and 8, a circular viewing window 49 is formed at a lower portion of the side wall of the insulating barrier 41 on the load side bushing 22 side. This viewing window 49
The formation position, size (diameter), shape, and the like are set so that the electrode structure and the like inside the insulating barrier 41 can be checked from the outside while the insulating barrier 41 is installed in or inside the main body case 12. Have been. In addition, the viewing window 49
Also serves as a mounting portion for a cushion 52 described later.

(Blind Member) As shown in FIGS. 1 and 8, a blind member 51 is attached to the viewing window 49, and the viewing window 49 is closed. The blind member 51 includes a cushion 52 as a buffer member and a puffer member, and a support cylinder 53 as a transmission member.

(Cushion) As shown in FIG. 9, the cushion 52 is made of an insulating and elastic synthetic resin material such as EPR or the like and is formed in a cylindrical shape having an open outer end. An annular mounting groove 54 is formed on the outer periphery of the outer end of the cushion 52, and the opening edge of the viewing window 49 in the insulating barrier 41 is interposed in the mounting groove 54. An air outlet 55 is formed at the center of the inner wall surface of the cushion 52. On the inner periphery of the outer end of the cushion 52, a tapered surface 56 expanding toward the outside and a large-diameter portion 57 larger than the inner diameter of the inner end are formed so as to be continuous.

As shown in FIG. 10, when the circuit is open, the movable electrode 2
When the inertial force causes an overrun in the opening direction, that is, when the movable electrode 6 is rotated beyond a predetermined open position indicated by a two-dot chain line in FIG. The length, diameter, and mounting position of the cushion 52, that is, the formation position of the viewing window 49, and the like are set so as to collide with the portion. When the rear surface of the movable electrode 26 collides with the inner end of the cushion 52, the cushion 52 is crushed.

(Support Cylinder) As shown in FIG. 9, the support cylinder 53 is formed of an insulating synthetic resin material such as polyethylene and has a cylindrical shape with an open outer end. Support tube 5
3 has a frusto-conical sealing portion 58 whose diameter increases toward the outer end portion. The maximum diameter of the sealing portion 58 is slightly larger than the large diameter portion 57 of the cushion 52. Diameter. A flange portion 59 is formed near the center of the outer periphery of the support cylinder 53, and a flat surface is formed on the side of the flange portion 59 on the cushion 52 side.

As shown in FIG. 10, the inner end side of the flange portion 59 of the support cylinder 53 is fitted into the hollow portion of the cushion 52 attached to the viewing window 49 from the outside. Support tube 5
The inward movement of the insulating barrier 41 is restricted by the flat surface of the flange portion 59 of the support cylinder 53 engaging with the opening end of the cushion 52. An elastic force inwardly acting on the cushion 52 acts on the outer periphery of the sealed portion 58 of the support cylinder 53, and the tapered surface 56 of the sealed portion 58 and the cushion 52 acts.
And are in close contact. That is, the opening at the outer end of the cushion 52 is sealed by the support cylinder 53. For this reason, when the back surface of the movable electrode 26 collides with the inner end of the cushion 52 and the cushion 52 is crushed at the time of opening,
The air inside is compressed and pushed out to the outside through the blow holes 55. Further, the back surface of the support cylinder 53, that is, the open end is in contact with the inner surface of the bottom case 13, and when the movable electrode 26 collides with the inner end of the cushion 52, an impact is generated.
And, it is transmitted to the main body case 12 via the bottom case 13.

(Cable binding member) As shown in FIG.
A plurality of binding members 61 are protrudingly provided on the peripheral edge of the bottom wall of the insulating barrier 41. As shown in FIG. 11A, an insertion hole 61 a through which a binding band 62 can be inserted is formed in the binding member 61.
Is formed. As shown in FIG. 11B, various cables 63 such as control lines are bundled along the bottom side of each insulating barrier 41, and are wound by a binding band 62 inserted into the insertion hole 61a. It is fixed to the insulating barrier 41. (Function and Effect of Embodiment) Next, the function and effect of the insulating barrier configured as described above will be described.

(1) In the pair of side walls 41a and 41b facing each other in the direction between different phases of the insulating barrier 41,
A plurality of engaging concave portions 44 are formed on one side wall 41a, and a plurality of engaging convex portions 45 are formed on the other side wall 41b. When the insulating barriers 41 are installed in the main body case 12, the engaging concave portions 44 and the engaging convex portions 45 of the side walls 41a and 41b adjacent to each other are engaged with each other. For this reason, the side walls 41a, 41b of each insulating barrier 41
Relative movement in a direction along the direction can be prevented.

(2) By fitting the fitting hole 47a of the connecting member 47 into the fitting portion 46 of each insulating barrier 41,
Each insulating barrier 41 was connected to each other. For this reason, not only the relative movement in the direction along the side walls 41a and 41b of each insulating barrier 41 but also the movement in the direction between different phases can be prevented. Therefore, at the time of opening, the installation positions of the insulating barriers do not relatively shift due to the violent movement of the movable electrode and the opening / closing mechanism for rotating the movable electrode.

(3) By connecting the engaging concave portion 44 and the engaging convex portion 45 and attaching the connecting member 47 to the fitting portion 46, the insulating barriers 41 of each phase are connected to each other. I made it. Therefore, it is easy to fix the insulating barriers 41 to each other.

The above embodiment may be modified as follows. In the present embodiment, one side wall 41a of the insulating barrier 41
Has an engaging recess 44 formed on the other side wall 41b and an engaging protrusion 45 formed on the other side wall 41b.
5 may be formed, and the engaging recess 44 may be formed on the other side wall 41b. Even in this case, the main body case 1
In the installation state of each insulating barrier 41 in the inside 2, the engaging concave portion 44 and the engaging convex portion 45 of the side walls 41 a and 41 b adjacent to each other engage with each other, and the side wall 4 of each insulating barrier 41 is formed.
Relative movement in the direction along 1a, 41b can be prevented.

In the present embodiment, the insulating barrier 41 of each phase
Into a fitting hole 47 of a connecting member 47 in each fitting portion 46.
are connected by fitting a with each other.
The fitting hole 47a is formed on the side of the
6 is formed. Then, both 47a and 46 may be fitted. Even in this case, each insulating barrier 4
1 can be connected.

Next, technical ideas other than the claimed invention which can be grasped from the embodiment will be described below together with their effects. The switch or the insulation barrier of the switch according to any one of claims 1 to 5, wherein a plurality of cable bundling members 71 are provided on an outer periphery of the insulation barrier. In this case, cables such as control lines can be easily bound and put together.

[0034]

According to the present invention, the relative movement between the insulating barriers provided for each phase can be prevented by engaging the adjacent insulating barriers with each other.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a switch.

FIG. 2 is an exploded front view of a bushing mounting portion.

FIG. 3 is a front sectional view of a main part of a bushing mounting portion.

FIG. 4 is a side view showing an engaged state of insulating barriers for three phases.

FIG. 5 is a perspective view of an insulating barrier.

FIG. 6 is a perspective view of an insulating barrier.

FIG. 7 is an enlarged sectional view of a main part showing an engagement state between an engagement concave portion and an engagement convex portion.

FIG. 8 is a perspective view of an insulating barrier.

FIG. 9 is an exploded front sectional view showing attachment of the cushion and the support cylinder.

FIG. 10 is a front sectional view showing the attachment between the cushion and the support cylinder.

FIG. 11A is a schematic perspective view illustrating attachment of a binding band to a binding member, and FIG. 11B is a perspective view illustrating a state in which various cables such as control lines are laid.

[Explanation of symbols]

11: switch, 12: body case, 13: bottom case,
21: power supply side bushing, 22: load side bushing, 2
3 fixed electrode, 26 movable electrode, 41 insulating barrier, 4
1a, 41b ... side wall, 44 ... engaging concave part forming engaging means, 45 ... engaging convex part forming engaging means, 46 ... fitting part forming engaging means, 47 ... forming engaging means A connecting member to be connected, 49 ... a viewing window.

Claims (5)

[Claims] A bushing opposed to each phase is supported on both side walls of a main body case. A fixed electrode is provided at an inner end of one bushing, and a fixed electrode is provided at an inner end of the other bushing with respect to the fixed electrode. In the insulation barrier of a switch, the movable electrodes corresponding to the movable electrodes are rotatably provided so as to be rotatable, and the electrodes are covered for each phase so as to provide insulation between phases and ground. An insulating barrier for a switch provided with an engagement means for preventing relative movement in the switch. 2. The switch according to claim 1, wherein the engaging means is a concave or convex portion formed on both side surfaces of the insulating barrier facing each other in the different phase direction and capable of engaging with each other. Insulation barrier. 3. The insulation barrier of a switch according to claim 1, wherein the engagement means includes a connecting member for connecting the insulation barriers to each other. 4. The connecting member is formed in a long shape from a synthetic resin material having an insulating property, and the connecting member has a concave portion or a convex portion formed on an upper surface or a lower surface of each insulating barrier. 4. The insulating barrier for a switch according to claim 3, wherein a plurality of protrusions or recesses that can be fitted to each other are arranged and formed along the longitudinal direction. 5. A bushing opposed to each phase is supported on both side walls of the main body case. A fixed electrode is provided at an inner end of one bushing, and the fixed electrode is provided at an inner end of the other bushing. A movable electrode that is rotatably provided so as to be capable of coming and going with respect to the switch is provided so as to be rotatable, and by covering both electrodes with an insulating barrier, the insulation between the phases and the ground is performed. Is a switch provided with a convex portion or a concave portion, and a concave portion or a convex portion which is engageable with the convex portion or the concave portion on the other side surface.