JPH04359821A - Operation link system of switchgear - Google Patents

Abstract

PURPOSE:To make an insulating rod, which causes the size enlargement, unnecessary and make a switchgear compact. CONSTITUTION:A main shaft 2 is installed in the lower part container 1 of a switchgear in the way that it can rotate freely and a driving lever 3, which is attached to and fixed in its extended part is engaged with an operational system 6 through a rod 5. Also, a lever 3 made of an insulating material is fixed in the main shaft 2 through an installation part corresponding to each phase of the switchgear. A long circular hole 8a is then formed in the lower end part of a movable main contactor 10 and the movable main contactor 10 is directly engaged with the tip part of the insulating lever 30. Since the operational system and a main circuit charging part are electrically insulated by the lever fixed in the main shaft, a switchgear which does not need an insulating rod and becomes compact is obtained.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] This invention relates to an operation link mechanism that connects the main contact movable part of a power switch (hereinafter simply referred to as a switch) such as a circuit breaker, switch, or disconnector to an operation mechanism. It is something.

0002

2. Description of the Related Art A conventional operating link mechanism for a switch has a movable main contactor and an operating link mechanism in order to insulate the operating mechanism and the main circuit live parts, as described in, for example, Japanese Patent Application Laid-Open No. 53-117793. It was common to have an insulating member interposed between the mechanisms. That is, conventional switches including the device described in the above-mentioned publication are generally as shown in FIG. A drive lever 3 is fixed to the extension of the main shaft 2 to the outside of the lower container 1, and a drive lever 3 is attached to the main shaft 2 for each phase of the switch so as to rotate together with the main shaft 2 inside the lower container 1. A lever 4 is correspondingly fastened. The drive lever 3 is connected to an operating mechanism 6 via a rod 5. Further, a vertical link 8 is connected to the tip of the lever 4 via a pin 7. This link 8 has a horizontally long oval hole 8a at its lower end, and when the end of the pin 7 inserted into the tip of the lever 4 is engaged with this oval hole 8a, rotation of the lever 4 is prevented. Convert to vertical displacement. Further, the upper end of the link 8 is connected to a movable main contact 10 via an insulating rod 9. That is, the upper and lower ends of the insulating rod 9 are rotatably connected to the movable main contact 10 and the link 8 by the pin 11, respectively, so that the movable main contact 10 can move in the vertical direction together with the link 8. There is. Further, an intermediate container 12 is arranged above the lower container 1, an upper container 13 is arranged above this intermediate container 12, and an upper main circuit terminal 14 is arranged at a position where the upper container 13 and the intermediate container 12 meet. The lower container 1 and the intermediate container 1 are supported via an insulating support member 15.
A lower main circuit terminal 16 is supported via an insulating support member 17 at the alignment position 2. A fixed main contact 18 is connected to the upper main circuit terminal 14, and the upper part of the movable main contact 10 moves in the vertical direction to connect and separate.The lower main circuit terminal 16 is connected to the movable main contact 18. A sliding contact 19 with which the central portion of the child 10 comes into sliding contact is connected. The lower container 1, intermediate container 12, and upper container 13 are combined with each other to form one closed container.

Since the conventional switch operation link mechanism is constructed as described above, the main shaft 2 is moved via the drive lever 3 as the rod 5 moves up and down in response to the operation of the operation mechanism 6.
rotates, and the lever 4 rotates clockwise or counterclockwise about the main shaft 2. As a result, the movable main contact 10 moves vertically via the link 8 and the insulating rod 9, and comes into contact with and separates from the fixed main contact 18. At this time, the insulating rod 9 provides electrical insulation between the link 8 and the movable main contact 10.

0004

[Problems to be Solved by the Invention] In the conventional switch operation link mechanism, an insulating rod is disposed between the link connected to the lever and the movable main contact as described above.
The position of the single pole part placed at the top of the lower container is raised by the dimension required to connect the insulating rod, which increases the height of the switch and increases the size of the entire device that houses this switch. There was a problem with this.

[0005] The present invention was made to solve these problems, and it is an object of the present invention to provide an operation link mechanism that can provide a compact switch.

[0006]

[Means for Solving the Problems] In the operating link mechanism for a switch according to the present invention, a lever fixed to a main shaft of the operating link mechanism is constructed of an insulating material.

[0007] It is advantageous to embed a filler metal in the connection portion of the lever made of an insulating material with other members.

Furthermore, in order to increase the holding stability of the lever, it is preferable to loosely fit the lever onto the main shaft and to hold the lever from both sides by mounting members attached to the main shaft.

Furthermore, in order to facilitate the attachment and detachment of the lever, it is preferable to form a recess at one end of the lever, engage this recess with the main shaft, and hold the lever from both sides by a mounting member attached to the main shaft. .

0010

[Operation] In the present invention, the lever itself fixed to the main shaft is made of an insulating material, and this lever portion electrically insulates between the operating mechanism and the main circuit charging section. the result,
There is no need for insulating rods, etc., and the height of the switch can be lowered.

[0011] Furthermore, by embedding a filler metal in the joint portion of the lever made of an insulating material with other members, the portion to which mechanical impact is applied is strengthened.

Furthermore, since the lever is loosely fitted onto the main shaft and is held from both sides by mounting members attached to the main shaft, the lever can be held stably.

Furthermore, a recess is formed at one end of the lever, and this recess is engaged with the main shaft, and the lever is held from both sides by the mounting member attached to the main shaft, so that the lever can be attached or removed from the side of the main shaft. This makes it easy to replace the lever by partially disassembling it.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing a first embodiment of a switch operation link mechanism according to the present invention. Since the configuration of this switch is basically the same as that of the conventional example shown in FIG. 18 described earlier, the same or corresponding parts are given the same reference numerals in the figure and detailed explanation will be omitted. ,below,
The explanation will focus on points specific to this embodiment.

In this embodiment, insulating levers 30 made of an insulating material are fixed to the main shaft 2 in correspondence with each phase of the switch. The lower part of the movable main contact 10 is formed into a link shape, and the lower end thereof has a horizontally long oblong hole 8.
a is provided, and the movable main contact 10 is directly connected to the insulating lever 30 by engaging the pin 7 inserted into the tip of the insulating lever 30 with the oblong hole 8a.

FIG. 2 is a partial plan view showing a part of the main shaft 2 to which the insulating lever 30 is attached in the switch of the above embodiment, and FIG. 3 is a sectional view taken along the line AA in FIG. Also, Figure 4
is a detailed front view of the insulating lever 30 alone, and FIG. 5 is a side view thereof. The insulating lever 30 has a hole 30a through which the main shaft 2 passes, is loosely fitted onto the main shaft 2, and is welded to the main shaft 2.
It is fixed and held by being connected to a disk-shaped mounting member 2a that is fixed by screwing, caulking, or the like. Therefore, the insulating lever 30 has a
A filler metal 31 provided with a screw hole 31a constituting a joint portion with the mounting member 2a is embedded at several locations. Further, the tip of the insulating lever 30 has a hole 32a for inserting the pin 7.
A filler metal 32 is buried therein. The insulating lever 30 is fixed by inserting a screw 33 from the mounting member 2a side and screwing it into a screw hole 31a of a filler metal 31, as shown in FIG. The portions of the insulating lever 30 to which mechanical impact is applied are strengthened by the fillers 31 and 32. Note that if the outer peripheries of these fillers 31 and 32 are formed into a knurled shape, they can be easily held securely in the insulating material.

This embodiment is constructed as described above, and the main shaft 2 rotates via the drive lever 3 as the rod 5 moves up and down in response to the operation of the operating mechanism 6, and the insulating lever 30 pivots the main shaft 2. Rotate clockwise or counterclockwise. As a result, the movable main contact 10 moves vertically and comes into contact with and separates from the fixed main contact 18. At this time, the insulating lever 30 provides electrical insulation between the main shaft 2 and the movable main contactor 10. Note that the rotation of the insulating lever 30 causes the pin 7 to move slightly in the left-right direction in FIG.
Since it is absorbed as play by the oblong hole 8a at the lower part of 0, the operation of the movable main contact 10 is not affected in any way.

[0018] As a result of the above structure, the height can be suppressed to make the switch compact, and the number of parts can be reduced.

FIG. 6 is a partial plan view showing a part of the main shaft 2 to which an insulating lever 30 according to a modification of the above embodiment is attached. As shown in this figure, a through hole 30b without a screw is provided in the insulating lever 30 in place of the screw hole 31a, and a screw 3
The insulating lever 30 may be coupled to the mounting member 2a by passing through the insulating lever 30 and tightening it with a nut 34, and the same effect can be obtained by doing so.

FIG. 7 is a sectional view showing a second embodiment of the switch operation link mechanism according to the present invention. Since the basic configuration of this switch is the same as that of the conventional example shown in FIG. 18 described above, the same or corresponding parts are given the same reference numerals in the figure and detailed explanations are omitted. death,
Hereinafter, the points specific to this embodiment will be mainly explained.

In this embodiment, an insulating lever 30 made of an insulating material is fixed to the main shaft 2 having a hexagonal cross section in correspondence with each phase of the switch. Also, the lower part of the movable main contact 10 is formed into a link shape, and an oblong hole 8a is provided at the lower end thereof, and when the pin 7 is engaged with the above-mentioned oval hole 8a, the movable main contact 10 is configured to be directly connected to the insulating lever 30.

FIG. 8 is a partial plan view showing a part of the main shaft 2 to which the insulating lever 30 is attached in the switch of the second embodiment, and FIG. 9 is a sectional view taken along the line AA in FIG. Also,
FIG. 10 is a detailed front view of the insulating lever 30 alone,
FIG. 11 is a side view thereof. The insulating lever 30 has a hole 30a through which the main shaft 2 passes, and is loosely fitted onto the main shaft 2.
It is sandwiched and fastened between a pair of disc-shaped mounting members 2a and 2b, which are respectively fixed by welding, screwing, caulking, or the like. The pair of mounting members 2a and 2b each have a hexagonal hole 2c in the center thereof through which the main shaft 2 passes, and one of the mounting members 2b has a screw hole 2c into which a screw 33 is screwed.
d is provided. Further, the insulating lever 30 is embedded at four locations around the insulating lever 30 with filler metals 31 each having a hole 31a that constitutes a connecting portion with the mounting members 2a, 2b. Further, at the tip of the insulating lever 30, there is a hole 32 for inserting the pin 7.
A filler metal 32 is buried therein. insulation lever 30
As shown in FIG. 8, the screws 33 are inserted from the side of one mounting member 2a, passed through the hole 31a of the filler metal 31, and screwed into the screw hole 2d of the other mounting member 2b, and these mounting members 2a , 2b to the main shaft 2.

In the case of this embodiment as well, the movable main contactor 10 similarly moves in the vertical direction in response to the operation of the operating mechanism 6.
It comes into contact with and separates from the fixed main contact 18. Further, the insulating lever 30 provides electrical insulation between the main shaft 2 and the movable main contactor 10. As a result, it is possible to reduce the height and form the switch compactly, and in this embodiment, the insulating lever 30 is held by being sandwiched from both sides by the pair of mounting members 2a and 2b. Therefore, retention stability is improved.

[0024] In this embodiment, one of the mounting members 2b
A screw hole 2d is provided in the hole to screw in the screw 33, but the screw hole 2d is made into a through hole without a screw,
A modification example in which the insulating lever 30 is fastened by tightening with a nut is also possible, and the same effect can be achieved by this modification.

Furthermore, the cross-sectional shape of the main shaft 2 and the mounting member 2
It is also possible to make a modification in which the shape of the hole 2c in the center of the holes 2a and 2b is made into a shape other than a hexagon. In that case, if there is a flat portion on at least one surface, the same effect can be achieved.

FIG. 12 is a sectional view showing a third embodiment of the switch operation link mechanism according to the present invention. Since the basic configuration of this switch is the same as that of the conventional example shown in FIG. 18 described above, the same or corresponding parts are given the same reference numerals in the figure and detailed explanations are omitted. However, the following will mainly explain the points specific to this embodiment.

In the case of this embodiment, insulating levers 30 also made of an insulating material are fixed to the main shaft 2 having a hexagonal cross section in correspondence with each phase of the switch. The lower part of the movable main contact 10 is formed into a link shape, and an oblong hole 8a is provided at the lower end of the movable main contact 10. When the pin 7 is engaged with the oval hole 8a, the movable main contact 10 is moved. It is configured to be directly connected to the insulating lever 30.

FIG. 13 is a partial plan view showing a part of the main shaft 2 to which the insulating lever 30 is attached in the switch of the third embodiment, and FIG. 14 is a sectional view taken along the line A--A in FIG. 13. Further, FIG. 15 is a detailed front view of the insulating lever 30 alone, and FIG. 16 is a sectional view taken along the line BB in FIG. 15. In the case of this embodiment, the insulating lever 30 includes a recess 30b that is engaged with the main shaft 2, and a pair of insulating levers that are fitted into the main shaft 2 and fixed to the main shaft 2 by welding, screwing, caulking, fitting, etc. It is sandwiched and fastened between the disc-shaped mounting members 2a and 2b. The pair of mounting members 2a and 2b each have a hexagonal hole 2c in the center thereof through which the main shaft 2 passes, and one of the mounting members 2b is provided with a screw hole 2d into which a screw 33 is inserted. The insulating lever 30 also has a hole 31 that forms a connecting portion with the mounting members 2a and 2b.
Embedded metal 31 with a shape is buried in three surrounding locations. Further, a filler metal 32 having a hole 32a into which the pin 7 is inserted is embedded in the tip of the insulating lever 30. As shown in FIG. 13, the insulating lever 30 is fastened by inserting a screw 33 from one mounting member 2a side, penetrating the hole 31a of the filler metal 31, and screwing it into the screw hole 2d of the other mounting member 2b. It is fixed to the main shaft 2 via mounting members 2a and 2b.

In the case of this embodiment as well, the movable main contactor 10 similarly moves in the vertical direction in response to the operation of the operating mechanism 6.
It comes into contact with and separates from the fixed main contact 18. Further, the insulating lever 30 provides electrical insulation between the main shaft 2 and the movable main contactor 10. As a result, the height can be suppressed and the switch can be formed compactly, and the pair of mounting members 2a, 2b
Since the insulating lever 30 is held so as to be pinched from both sides, the holding stability is high. In addition, the insulation lever 30
Since the mechanical strength of the insulating lever 30 is lower than that of other members, it may be necessary to replace it during use of the switch. However, if the structure is as in this embodiment, the insulating lever 30
As a result, the insulating lever 30 can be replaced by only partially disassembling the switch, making the replacement work easy.

Note that a modification as shown in FIG. 17 is also possible in this embodiment. That is, the insulating lever 30 can be tightened by making the screw hole 2d provided in one of the mounting members 2b into a through hole without a screw, and tightening it with a nut, and the same effect can also be achieved by doing so.

Also, in the case of this embodiment, it is possible to modify the cross-sectional shape of the main shaft 2 and the shape of the central hole 2c of the mounting members 2a, 2b to a shape other than a hexagon having a flat surface on at least one surface. , and the same effect can be achieved by doing so.

Furthermore, in each of the above embodiments, an example is shown in which the mounting member is shaped like a disk, but the invention is not limited to this, and the lever made of an insulating material can be fastened using the hole as a connecting part. Other polygons such as squares may be used as long as they can be used, and the same effect can be achieved in that case as well.

Furthermore, in each of the above embodiments, the movable main contact is directly connected to the insulating lever via a pin by making the lower part of the movable main contact into a link shape and providing an oblong hole for coupling thereto. However, depending on the case, a separate link portion having an oblong hole may be provided and this link portion may be rotatably connected to the movable contact, and the same effect can also be achieved by this.

[0034]

[Effects of the Invention] As described above, according to the present invention, the lever fixed to the main shaft of the operating link mechanism is made of an insulating material, and the lever electrically insulates between the operating mechanism and the live part of the main circuit. This eliminates the need for insulating rods and provides a compact switch.

[0035] By embedding a filler metal in the joint part of the lever made of an insulating material with other members, the joint part is strengthened.

Furthermore, by holding the lever from both sides by the mounting members, holding stability is increased.

Furthermore, since the lever is provided with a recess so that it can be attached and detached from the side, the lever can be easily replaced.

[Brief explanation of drawings]

[Fig. 1] A first operation link mechanism of a switch according to the present invention.
Cross-sectional view showing an example

[Fig. 2] A partial plan view showing a part of the main shaft with the insulating lever attached.

[Figure 3] Cross-sectional view taken along line A-A in Figure 2

[Figure 4] Detailed front view of the insulating lever alone

[Figure 5] Detailed side view of the insulating lever alone

[Fig. 6] A partial plan view showing a part of the main shaft to which an insulating lever according to the modification is attached.

[Fig. 7] A second operating linkage mechanism of a switch according to the present invention.
Cross-sectional view showing an example

[Fig. 8] A partial plan view showing a part of the main shaft with the insulating lever attached.

[Fig. 9] Cross-sectional view taken along line A-A in Fig. 8

[Figure 10] Detailed front view of the insulating lever alone

[Figure 11]
Detailed side view of the insulating lever alone

FIG. 12 is a sectional view showing a third embodiment of the switch operation link mechanism according to the present invention.

[Fig. 13] A partial plan view showing a part of the main shaft with the insulating lever attached.

[Fig. 14] Cross-sectional view taken along line A-A in Fig. 13

[Figure 15] Detailed front view of the insulating lever alone

[Figure 16]
BB line sectional view in Figure 15

[Fig. 17] A partial plan view showing a part of the main shaft to which an insulating lever according to a modification thereof is attached.

[Figure 18] Cross-sectional view showing a conventional switch

[Explanation of symbols]

1 Lower container 2 Main shaft 2a, 2b Mounting parts 6 Operation mechanism 10　Variable main contactor 12 Intermediate container 13 Upper container 18 Fixed main contact 30 Insulation lever 30b Recessed part 31, 32 Burial money

Claims (4)

[Claims] Claim 1: A fixed main contact and a movable main contact are disposed in a sealed container so as to be able to approach and separate from each other, and
A switch that rotatably supports a main shaft in the container and connects the movable main contact to an external operating mechanism via an operating link mechanism including the main shaft and a lever fixed to the main shaft, the lever An operating link mechanism for a switch, characterized in that the switch is made of an insulating material. 2. The operating link mechanism for a switch according to claim 1, wherein a filler metal is embedded in a connecting portion of the lever made of an insulating material and connected to another member. 3. The operating link mechanism for a switch according to claim 1, wherein a lever made of an insulating material is loosely fitted onto the main shaft, and the lever is held from both sides by mounting members attached to the main shaft. 4. The lever according to claim 1 or 2, wherein a recess is formed at one end of the lever made of an insulating material, the recess is engaged with the main shaft, and the lever is held from both sides by a mounting member attached to the main shaft. operating linkage of the switch.