JP2003297193A - Switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch in which insulation materials are appropriately arranged without enlarging the size of a case, an arc generated when the switch is turned off is certainly extinguished between a fixed contact and the tip of a movable contact, and resistance to thunder is further improved. <P>SOLUTION: One end of an operating rod 14 is connected to the specified position of the movable contact 12 between a rotation center and a fixed electrode 11 so that the movable contact 12 is linked with the motion of a driver 13. A connection 12a of the movable contact 12 connected to the operating rod 14 is covered with a cover 15 to keep an insulation distance between the connection 12a and the fixed contact 11. This prevents an arc from transferring to the connection 12a from the tip of the fixed contact 11 even if the movable contact 12 is rotated to turn off the switch, and the position of the connection 12a is closer to the fixed contact 11 than the tip of the movable contact 12 and breaks the circuit certainly without retaining the arc. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch, and more particularly to an internal structure capable of preventing continuation of an arc generated during an opening operation in which a movable contact is separated from a fixed contact.

[0002]

2. Description of the Related Art Among switches for opening and closing distribution lines and the like, a blade type or a butt type system has been generally used as a structure for inserting or releasing a movable contact with respect to a fixed contact inside a case. Has been used for. These conventional switches include fixed contacts and movable contacts, as well as connection terminals that are attached to the side wall of the case and electrically connect each contact to an external lead wire, a handle and a drive that actuate the movable contact. It is composed of a mechanism and the like.

In such a conventional switch, an arc is generated between the fixed contact and the movable contact when the switch is turned on and off, which adversely affects each part. Therefore, in order to extinguish the generated arc as early as possible. Various ideas have been made. An example of such a conventional switch is shown in FIG. FIG. 7 is a schematic configuration sectional view of a conventional switch.

In FIG. 7, the conventional switch 100 is
A case 101 made of metal, bushings 102 and 103 penetrating the case 101, a fixed contactor 104 fixedly supported by one bushing 102, and a rotatably supported by the other bushing 103. Movable contact 105 that can be inserted into and released from fixed contact 104
And formed of an insulating material to accommodate the fixed contactor 104,
The arc extinguishing chamber portion 106 supported by the bushing 102 is provided. The movable contactor 105 can be inserted into and removed from the arc-extinguishing chamber 106 through the insertion opening 106a so that the movable contactor 105 can be inserted into and released from the fixed contactor 104.

In the conventional switch 100 having the above structure, when the movable contact 105 rotates in the opening direction with respect to the fixed contact 104, an arc is generated between the fixed contact 104 and the tip of the movable contact 105. To do. When this arc occurs, arc-extinguishing gas is usually generated from the material of the inner wall of the arc-extinguishing chamber 106 due to arc heat, and the arc extinguishes. The pressure may increase, and the arc may blow out of the insertion opening 106a as the gas blows out. Therefore, it is necessary to increase the distance between the fixed contact 104 and the movable contact 105.

[0006]

Since the conventional switch is constructed as described above, when the movable contact 105 is opened, the fixed contact 104 and the tip of the movable contact 105 arc when the contact is opened. Although the conventional switch has a sufficient insulation distance that cannot be maintained, the device design is made in order to make each component arrangement compact in the case 101 in the conventional switch, so that the movable contactor 105 is interlocked with the drive mechanism. Connecting part 105 of movable contactor 105 with operating rod 107
In some cases, a may be arranged relatively close to the fixed contact 104, and the connecting portion 105 is located closer to the fixed contact 104 due to the rotation of the movable contact 105 when opened.
There is a problem that the arc is transferred from the tip of the movable contactor 105 to a, and there is a high risk that the arc continues to exist and cannot be interrupted.

In order to surely extinguish the arc with such a conventional switch, the fixed contact 104 and the movable contact 10
5 It is necessary to secure the space distance between each part, and the case 10
In addition to the increase in the volume of No. 1, the arrangement of each component in the case 101 is limited, and the degree of freedom in device design is limited.

The present invention has been made to solve the above-mentioned problems, and by appropriately disposing an insulating material, it is possible to reliably move an arc generated during an opening operation with a fixed contact without causing an increase in the size of the case. An object is to provide a switch that can be extinguished between the contact tip and the tip.

[0009]

A switch according to the present invention comprises:
In a switch for closing and opening a fixed contact housed in a case with a movable contact housed rotatably in the case, at least in a movable range of the movable contact member from a rotation center position. Also, one end of the movable contact is connected to a predetermined portion of the movable contact that is close to the fixed contact, and the other end is connected to a predetermined drive unit. The movable contact moves while the drive unit operates. An operating rod made of an insulating material for rotating the movable contactor within a predetermined range, and a cover made of an insulating material for shielding the connection part of the movable contactor with the one end of the operating rod from the fixed contactor. is there.

As described above, according to the present invention, the operating rod is arranged such that one end thereof is connected to a predetermined portion closer to the fixed contact than the rotation center position of the movable contact so that the movable contact is interlocked with the movement of the drive unit. In addition to installing a cover that covers the connection part of the movable contact with the one end of the operating rod, this cover ensures a sufficient insulation distance between the connection part of the movable contact and the fixed contact to open and close. Even when the connecting portion of the movable contact is relatively closer to the fixed contact than the movable contact tip due to the rotation of the movable contact when the vessel is opened, the arc is transferred from the movable contact tip to the connecting portion. It is possible to prevent the arc, and to extinguish the arc without making the arc last, so that the circuit can be surely cut off, and in addition to the safety and reliability, the durability of each contact is enhanced. Further, it is possible to surely prevent the arc from continuing and to arrange the facing fixed contact and the movable contact in a compact manner, which can be dealt with without increasing the size of the case.

Further, in the switch according to the present invention, the cover is integrally formed with the one end portion of the operation rod, if necessary. As described above, in the present invention, the cover and the operation rod one end are integrally formed, and the cover can be collectively disposed at the operation rod connection portion of the movable contact, so that the arc connection portion can be obtained without increasing the number of parts. The entire device can be constructed at a lower cost while ensuring the safety. Furthermore, the cover can be attached to and detached from the movable contact efficiently at the same time as the operation rod, and the assembling / maintenance is also improved.

Further, the switch according to the present invention is arranged so as to shield the connecting portion between the operating rod and the drive unit from the fixed contact in the vicinity of the other end of the operating rod, if necessary. , A guard body made of an insulating material that secures a predetermined insulating distance between the fixed contactor and the conductor portion of the drive unit. As described above, in the present invention, the guard body that electrically shields the connecting portion between the operating rod and the driving portion is provided in the vicinity of the other end portion of the operating rod, and between the fixed contactor and the driving portion conductor portion. By always interposing the guard body, it is possible to secure an insulation distance between the fixed contact and the drive portion conductor portion and improve the lightning resistance performance.

Further, the switch according to the present invention is arranged so as to shield the portion near the center of rotation of the movable contact from the fixed contact, as necessary, and the fixed contact and the movable contact are arranged. It is provided with a guard body made of an insulating material that secures a predetermined insulating distance from the portion near the center of rotation of the. As described above, in the present invention, the guard body that electrically shields the portion near the center of rotation of the movable contact is disposed, and the guard body is always provided between the fixed contact and the portion near the center of rotation of the movable contact. With the interposition of, the insulation distance between the fixed contact and the portion near the rotation center of the movable contact can be secured, and the lightning resistance performance can be improved.

Further, in the switch according to the present invention, the guard body is integrally formed with the cover, if necessary. As described above, in the present invention, the guard body is integrally formed with the cover, and the movable contactor and the drive unit can be collectively disposed, whereby the lightning resistance performance can be improved without increasing the number of parts, and the safety can be improved. It is possible to build the entire device at a lower cost while ensuring the above. Furthermore, the guard can be attached to and detached from the drive unit and the movable contact at the same time as the cover, and the assembling / maintenance is also improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment of the Invention) A first embodiment of the present invention will be described below with reference to FIGS. 1 is a front view, a left side view and a right side view of a switch according to the present embodiment, FIG. 2 is an internal schematic configuration diagram of the switch according to the present embodiment, and FIG. 3 is a switch according to the present embodiment. 4 is a schematic view of the handle shaft portion and other handle shaft portions of the switch according to the present embodiment, and FIG. 5 is related to the present embodiment. It is a bottom view of a separator attaching structure explanatory view and a separator holder in a switch.

In each of the drawings, the switch 1 according to the present embodiment has a metal case 10, a fixed contactor 11 housed in the case 10, and a rotatably housed inside the case 10. A movable contactor 12 that makes and releases the fixed contactor 11, a drive unit 13 that applies a driving force for rotating the movable contactor 12, and end portions that are respectively connected to the movable contactor 12 and the drive unit 13. And a connecting portion between the operation rod 14 made of an insulating material that moves the movable contact 12 in conjunction with the movable contact 12 while moving in accordance with the operation of the drive unit 13 and rotates the movable contact 12 by a predetermined range. Cover 15 made of an insulating material that electrically shields the fixed contact 11 from the fixed contact 11
A bushing 16, 17 for connecting a power distribution line to the fixed contact 11 or the movable contact 12, and a handle 18 for manually switching between closing and opening of the movable contact 12; And a configuration including.

The fixed contact 11 and the movable contact 1
2, operating rod 14, cover 15, and bushing 1
6 and 17 are case 1 according to the three-phase distribution line.
Three sets are arranged at 0. The fixed contactor 11 is connected to the bushing 16 and is a known arc extinguishing chamber portion 11a made of an insulating material.
It is configured to be fixedly supported in the case 10 in a state of being housed in.

The movable contact 12 is connected to a bushing 17 and rotatably supported in the case 10. The movable contact 12 can be rotated a predetermined angle so that the tip of the movable contact 12 can be inserted into or released from the fixed contact 11. It is a mechanism that is done. This movable contact 1
A connecting portion 12a with one end of the operation rod 14 is formed to project toward the fixed contact 11 side at a position separated by a predetermined dimension from the center of rotation 2. The drive unit 13 has a known structure that rotates the main shaft 13a and the drive arm 13b by a predetermined angle by the action of a drive mechanism, and a detailed description thereof will be omitted.

The operating rod 14 is a set of two elongated plates made of an insulating material, and in the movable range of the movable contact 12, the movable contact is closer to the fixed contact 11 than the rotation center position. One end portion is connected to the connecting portion 12a of 12 and the other end portion is connected to the tip of the drive arm 13b of the drive portion 13. The cover 15 includes an operation rod 14
It is attached to one end, and is configured to collectively shield the connecting portion 12a of the movable contact 12 and one end of the operating rod 14 from the fixed contact 11.

The bushings 16 and 17 are arranged so as to face each other and penetrate the side wall of the case 10, and a distribution line (not shown) and the fixed contactor 11 or the movable contactor 12 are provided.
This is a known configuration having a central conductor that connects to and, and detailed description thereof will be omitted. The bushings 16 and 17 are fixed to the side walls of the case 10 with insulator pressers 16a and 17a, respectively, and are arranged side by side for three phases.
The gap between 17 is narrowed to reduce the size of the switch as a whole.

The handle 18 is manually operated to drive the drive unit 1.
3 is operated to switch between closing and opening, and the interlocking mechanism with the drive unit 13 has a known structure, and detailed description thereof will be omitted. The case 10 is projected from the center of the handle 18.
As shown in FIG. 4 (A), an O-ring 1 for maintaining airtightness inside the case 10 is provided on the handle shaft portion 18a that penetrates the side wall and connects the handle 18 and each mechanism inside the case 10.
8b is attached, and an O-ring 18c is attached between the outer periphery of the handle shaft portion 18a outside the O-ring 18b and the boss (inner periphery of the hole) on the side wall of the case 10. The O-ring 18c prevents moisture and the like from entering from the outside and prevents the handle shaft portion 18a and the boss from being rusted.
The groove for partially housing the outer O-ring 18c is not limited to the boss side, but may be provided on the outer periphery of the handle shaft portion 18a as shown in FIG. 4B.

In the case 10, the open / close mechanism composed of the fixed contact 11 and the movable contact 12 of each phase is a well-known insulating separator which is a substantially boat-shaped cover for strengthening insulation between each phase and ground. It is a structure covered with 10a. This insulating separator 10a is a separator holder 1
It is configured to be held so as not to move easily at 0b. Separator retainer 10b for retaining the insulating separator 10a
5, has a simple structure in which one of the fixed parts to the case 10 is engaged without using a screw or the like, and when a short circuit occurs in the case 10, the internal pressure of the insulating separator 10a is increased. When pressure is applied, the separator pressing tool 10b is disengaged so that the internal pressure can be smoothly released to the outside of the case 10.

Next, the opening operation state of the switch according to the present embodiment will be described. When the movable contact 12 rotates in the opening direction with respect to the fixed contact 11, an arc is generated between the fixed contact 11 and the tip of the movable contact 12. With the further rotation of the movable contactor 12, the connecting portion 12a comes closer to the fixed contactor 11 than the tip of the movable contactor 12, but since the connecting portion 12a is covered by the cover 15, the movable contactor is moved. The arc does not move from the tip of the child 12 to the connecting portion 12a. Finally, in addition to further increasing the distance between the fixed contact 11 and the tip of the movable contact 12,
The arc is extinguished because the arc extinguishing gas is generated by the melting of the insulating material on the inner wall of the arc extinguishing chamber portion 11a due to the arc.

As described above, in the switch according to the present embodiment, the operating rod 14 for interlocking the movable contact 12 with the movement of the drive portion 13 is provided, and the movable contact 12 is also provided.
The cover 15 is provided to cover the connecting portion 12a of the movable contactor 12 and the fixed contactor 11 of the movable contactor 12.
Since a sufficient insulation distance between the movable contactor 12 and the movable contactor 12 is opened when the switch is opened, the connecting portion 12a of the movable contactor 12 is rotated.
Is relatively closer to the fixed contact 11 than the tip of the movable contact 12, the arc can be prevented from migrating from the tip of the movable contact 12 to the connecting portion 12a, and the arc can be extinguished without continuing. The switch can be opened securely, and in addition to safety and reliability, the durability of each contact can be improved. In addition, it is possible to reliably prevent the arc from continuing and to arrange the fixed contact 11 and the movable contact 12 that face each other in a compact manner, so that the switch 1 can be made small.

(Second Embodiment of the Present Invention) Second Embodiment of the Present Invention
The embodiment will be described with reference to FIG. FIG. 6 is a front view of a main part and a right side view of the operating rod of the switch according to the present embodiment. In the switch according to the present embodiment in FIG. 6, as in the first embodiment, a case 20, a fixed contactor (not shown), a movable contactor 22, and a drive unit 23.
An operating rod 24, a bushing (not shown),
While a handle (not shown) is provided, a different point is that the operation rod 24 has a cover 24a for preventing arc transfer.
It also has a configuration in which the guard bodies 24b and 24c are integrated. Similar to the first embodiment, three sets of fixed contacts, movable contacts 22, operation rods 24, and bushings are provided in the case 20 in accordance with the three-phase power distribution lines.

The operating rod 24 is made of an insulating material and has one end connected to the connecting portion 22a of the movable contact 22 and the other end connected to the tip of the drive arm 23b of the drive portion 23. is there. A substantially plate-shaped cover 24a that electrically shields the connecting portion 22a of the movable contact 22 from the fixed contact is integrally formed at one end of the operation rod 24. On the other hand, at the other end of the operating rod 24, the operating rod 2
A substantially plate-shaped guard body 24b that electrically shields the connection portion between the drive shaft 23 and the drive portion 23 from the fixed contact is integrally formed, and from the intermediate portion to the one end of the operation rod 24,
A substantially plate-shaped guard body 24c that electrically shields the portion of the movable contact 22 near the center of rotation from the fixed contact is integrally formed.

Next, the opening operation state of the switch according to the present embodiment will be described. An arc is generated between the fixed contactor and the tip of the movable contactor 22 which rotates in the opening direction with respect to the fixed contactor (not shown). Along with the further rotation of the movable contact 22, the connecting portion 2 is moved from the tip of the movable contact 22.
Although the position 2a is close to the fixed contactor, the connecting portion 22a is covered by the cover 24a which is integral with the operating rod 24. Therefore, as in the first embodiment, from the tip of the movable contactor 22 to the connecting portion 22a. The arc does not move, and finally the arc is extinguished between the fixed contact and the tip of the movable contact 22. In addition, when the lightning surge enters, the guard bodies 24b and 24c can prevent the lightning from moving from the movable contactor 22 or the like, which is an electrically charging portion, to the case 20 or the like, which is the grounding portion, and the lightning resistance performance is improved. To be made.

As described above, in the switch according to the present embodiment, the guard body 24b is arranged at the other end of the operating rod 24, and the guard body 24c is arranged from the intermediate portion to the one end of the operating rod 24. Since the guard bodies 24b and 24c are respectively provided between the fixed contactor and the drive part 23 conductor part and the part near the rotation center of the movable contact 22, the fixed contactor and the drive part 23 conductor part and the movable part. The insulation distance between the contact 22 and the portion near the center of rotation can be secured, and the safety of the device can be improved. Further, the cover 24a and the guard bodies 24b and 24c are integrally formed with the operation rod 24 so that the cover 24a and the guard bodies 24b and 24c can be collectively disposed on the movable contact 22 and the drive unit 23, so that the insulation distance can be secured without increasing the number of parts. , The whole device can be constructed at a lower cost while improving safety. Further, the cover and guard can be attached / detached simultaneously with the operation rod 24, and the assembling / maintenance is excellent.

In the switch according to the above embodiment, the operating rod 24, the cover 24a, and the guard body 2 are provided.
4b and 24c are integrally formed, however, in addition to this, only the cover and the guard body are integrally formed to operate the operation rod 24.
Alternatively, the cover and the guard body may be collectively attached to a similar operation rod in an existing switch to provide the same effect as the above embodiment.

[0030]

As described above, according to the present invention, one end of the movable contact is connected to a predetermined portion closer to the fixed contact than the center of rotation of the movable contact, and the movable contact is interlocked with the movement of the drive unit. In addition to disposing the operation rod, a cover is provided to cover the connecting portion of the movable contact with one end of the operating rod, and this cover ensures a sufficient insulation distance between the connecting portion of the movable contact and the fixed contact. Thus, when the movable contact is rotated when the switch is opened so that the connecting portion of the movable contact is relatively closer to the fixed contact than the movable contact tip, the arc is moved from the movable contact tip to the connecting portion. Therefore, it is possible to prevent the arc from extinguishing, to extinguish the arc without causing the arc to continue, and to reliably cut off the circuit. In addition to safety and reliability, the durability of each contact is enhanced. Further, it is possible to reliably prevent the arc from continuing and to arrange the facing fixed contact and the movable contact in a compact manner, and to cope with the case without enlarging the case.

Further, according to the present invention, the cover and the one end portion of the operation rod are integrally formed, and the cover can be collectively disposed at the operation rod connecting portion of the movable contact, so that the arc can be formed without increasing the number of parts. The effect of being able to prevent the transition / survival of the connection part to the connecting part and to construct the entire device at a lower cost while ensuring safety. Furthermore, the cover can be attached to and detached from the movable contact efficiently at the same time as the operation rod.
This has the effect of improving assembly / maintenance.

Further, according to the present invention, a guard body is provided near the other end of the operating rod to electrically shield the connecting portion between the operating rod and the driving portion, and the fixed contact and the driving portion conductor portion are provided. Since the guard body is always interposed between the two, there is an effect that the insulation distance between the fixed contact and the drive portion conductor portion can be secured and the lightning resistance performance can be improved.

Further, according to the present invention, the guard body for electrically shielding the portion near the center of rotation of the movable contact is provided, and the guard body is provided between the fixed contact and the portion near the center of rotation of the movable contact. By always interposing the guard body, there is an effect that the insulation distance between the fixed contact piece and the portion in the vicinity of the rotation center of the movable contact piece is secured, and the lightning resistance performance is improved.

Further, according to the present invention, since the guard body is integrally molded with the cover so that the guard body can be collectively disposed on the movable contactor and the driving portion, the lightning resistance performance can be improved without increasing the number of parts. The effect is that the entire device can be constructed at a lower cost while ensuring safety. further,
The guard body can be attached / detached to / from the drive unit or the movable contact at the same time as the cover, and the assembly / maintenance can be improved.

[Brief description of drawings]

FIG. 1 is a front view, a left side view and a right side view of a switch according to a first embodiment of the present invention.

FIG. 2 is an internal schematic configuration diagram of the switch according to the first embodiment of the present invention.

FIG. 3 is a front view of a main part of the switch according to the first embodiment of the present invention and an enlarged view taken along line BB.

FIG. 4 is a schematic configuration diagram of a handle shaft portion and another handle shaft portion in the switch according to the first embodiment of the present invention.

FIG. 5 is a diagram for explaining the separator mounting structure in the switch according to the first embodiment of the present invention and a bottom view of the separator retainer.

FIG. 6 is a front view of a main part of a switch according to a second embodiment of the present invention and a right side view of an operating rod.

FIG. 7 is a schematic configuration sectional view of a conventional switch.

[Explanation of symbols]

1,100 switch 10, 20 cases 10a insulating separator 10b Separator retainer 11, 21 Fixed contact 11a Arc extinguishing chamber section 12, 22 Movable contact 12a, 22a connection part 13, 23 Drive 13a spindle 13b, 23b drive arm 14, 24 Operation rod 15, 24a cover 16,17 bushings 16a, 17a Insulator holder 18 handles 18a Handle shaft 18b, 18c O-ring 24b, 24c Guard body 101 cases 102, 103 bushings 104 Fixed contact 105 Movable contact 105a connection part 106 Extinguishing room 106a insertion opening 107 Operation rod

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[Procedure amendment]

[Submission date] October 24, 2002 (2002.10.
24)

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 7]

[Figure 6]

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Jun Watanabe             1-1, Oitakitamachi, Saga City, Saga Prefecture             Togami Denki Seisakusho F-term (reference) 5G027 AA03 BC02

Claims (5)

[Claims] 1. A switch for closing and opening a fixed contact housed in a case with a movable contact housed rotatably in the case, and at least in a movable range of the movable contact. One end is connected to a predetermined part of the movable contact which is closer to the fixed contact than the rotation center position, and the other end is connected to a predetermined drive part, which moves with the operation of the drive part. And a cover made of an insulating material that shields the fixed contact from the operating rod made of an insulating material that rotates the movable contact in a predetermined range by interlocking the movable contact with the one end of the operating rod of the movable contact. A switch which is provided with. 2. The switch according to claim 1, wherein the cover is integrally formed with one end of the operation rod. 3. The switch according to claim 1, wherein the connecting portion between the operating rod and the drive unit is arranged near the other end of the operating rod so as to shield the fixed contact from the connecting portion. And a guard body made of an insulating material that secures a predetermined insulating distance between the fixed contactor and the conductor portion of the drive unit. 4. The switch according to claim 1, wherein the movable contactor is arranged so as to shield a portion near a rotation center of the movable contactor from the fixed contactor. A switch comprising a guard body made of an insulating material that secures a predetermined insulation distance between the movable contactor and a portion near the center of rotation of the movable contactor. 5. The switch according to claim 3 or 4, wherein the guard body is integrally formed with the cover.