JP4435807B2 - Contact pressure adjustment mechanism of switch - Google Patents

Description

  The present invention relates to a contact pressure adjusting mechanism that adjusts a contact pressure between a movable contact and a fixed contact of a power switch.

  As a conventional technique for adjusting the contact pressure of the contact of the switch, for example, an insulation operating device for the switch as shown in FIG. 4 is known. As shown in the figure, an insulation operating device for a vacuum switch 21 having a fixed contact 22 and a movable contact 23, and an insulating rod 24 is connected to the movable contact 23 and wiped slidably on its drive side. The metal fitting 25 is connected. A contact pressure spring 26 is inserted between the insulating portion of the insulating rod 24 and the wipe link 25. Further, a rod end 27 is fastened to the drive side of the wipe fitting 25 by a lock nut 28, and a tip end portion of the rod end 27 is attached to a lever 31 fixed to a rotating shaft 30 rotated by an operating device 29. It is connected.

When the closing operation is performed from the open state as shown in the figure, the rotating shaft 30 and the lever 31 are driven counterclockwise, the rod end 27 moves upward by a fixed stroke, and the wipe fitting 25 also moves by the same stroke. Moving. During this operation, the upward movement of the insulating rod 24 is restricted from the time when the movable contact 23 comes into contact with the fixed contact 22, and the contact pressure spring 26 is compressed to a predetermined size while being compressed by the wipe fitting 25. The closing is completed. In the closed state, the contactors 22 and 23 are in contact with each other at a constant contact pressure by the contact pressure spring 26.
The contact pressure is adjusted by loosening the lock nut 28 and rotating the wipe fitting 25 to change the screwing length between the rod end 27 and the wipe fitting 25 and moving the movable contact 23 up and down. (For example, refer to Patent Document 1).

  Also, as a simpler structure, the wipe fitting 25 shown in FIG. 4 is omitted, and the insulating rod is rotated to adjust the screw connection length of either the upper or lower rod connecting portion of the insulating rod. Generally known.

Japanese Patent Laid-Open No. 10-321089 (page 3-4, FIG. 1)

In the conventional insulation operating device for a switch as shown in Patent Document 1, since the contact pressure adjusting mechanism is provided in a part of the movable part, the movable mass of the movable part is increased. If the mass is increased, the operation mechanism is burdened and the speed of the movable contact is reduced, which is disadvantageous for the current interruption performance.
In addition, when adjusting the threaded part of the rod by rotating the insulating rod, it is difficult to finely adjust the compression amount of the contact pressure spring, and it takes a lot of time to adjust. Since it took time, there was a problem that workability was poor.

  The present invention has been made to solve the above-described problems, and can be easily adjusted, and the contact pressure of the switch that improves the current interrupting performance by reducing the weight of the movable part. The purpose is to obtain an adjustment mechanism.

A contact pressure adjusting mechanism for a switch according to the present invention includes a rotating shaft that rotates in response to an operation of closing or closing the switch, a rotating shaft lever that is fixed to the rotating shaft and rotates together with the rotating shaft, A fixed contact for a switch having a connecting link having one end connected to a rotating shaft lever via an intermediate link and the other end pivotally supported by a movable support, an insulating rod, a wipe link and a contact pressure spring. Is arranged on the same axis as the axis of the movable contact and separation direction, one end is connected to the middle part of the connecting link, the other end is connected to the movable contact of the switch, and the driving force from the rotary shaft lever The movable contactor is driven in the contact / separation direction , and a main circuit coupling portion that applies contact pressure to both contacts by a contact pressure spring at the time of closing is provided, and the movable support body is parallel to the contact / separation direction of both contactors. by displacing the main circuit connecting portion connected to the connecting link is both Go to and away direction of the probe, in which the contact pressure is to be adjusted.

  According to the contact pressure adjusting mechanism for a switch according to the present invention, the contact pressure spring is provided at the intermediate portion of the connecting link having one end connected to the rotary shaft lever via the intermediate link and the other end pivotally supported by the movable support. Since the main circuit connecting portion having the main circuit connecting portion is connected and the movable support is displaced so that the contact pressure of both contactors can be adjusted, the main circuit connecting portion which is the movable portion does not have the adjusting portion. It can be easily adjusted. Further, since the movable portion can be simplified and reduced in size and weight, the operation speed of the movable contact can be increased and the current interruption performance can be improved.

Embodiment 1 FIG.
Hereinafter, specific description will be given based on the drawings. 1 and 2 are schematic configuration diagrams of a switch provided with a contact pressure adjusting mechanism for a switch according to Embodiment 1 of the present invention. FIG. 1 shows an open state, and FIG. 2 shows a closed state. It is. FIG. 3 is an explanatory diagram for explaining a case where the contact pressure is insufficient at the time of closing. In the following description, a vacuum switch is taken as an example of a switch.

1 and 2, the vacuum switch 1 includes a fixed contact 2 and a movable contact 3 that are opposed to each other. The lead-out portion 2a led out from the fixed contact is insulated and supported by an insulating frame (not shown), and a fixed-side main circuit conductor (not shown) is connected thereto. The insulating frame is supported by the switch frame 4.
The movable contact 3 is supported by the vacuum switch 1 so as to be movable toward and away from the fixed contact 2, and a lead-out portion 3 a led out to the outside via a flexible conductor (not shown). A movable main circuit conductor (not shown) is connected.

In order to open and close the movable contact 3, the switch frame 4 is provided with an operating device 5, and is rotated according to commands for turning on and off from an operating mechanism (not shown) of the operating device 5. A shaft 6 is provided, and a rotation shaft lever 7 is fixed to the rotation shaft 6. A connecting link 10 is provided, one end of which is connected to the rotating shaft lever 7 via an intermediate link 8 and the other end of which is pivotally supported by a movable bearing 9 which is a movable support.
In the movable bearing 9, an adjustment screw 9a is fixed to a housing portion having a bearing body. The adjustment screw 9a is fixed to the switch frame 4 with a nut 11, and the screwing length of the screw portion can be adjusted by turning the nut 11. It is like that. The moving direction of the screw is parallel to the contact / separation direction of both contacts 2 and 3.
The bearing body may be provided on the side of the connecting link 10 and the portion corresponding to the movable bearing 9 in the figure may be a movable support that supports the bearing.

In order to transmit the driving force from the connecting link 10 side to the movable contact 3, the main circuit connecting portion 15 having the insulating rod 12, the wipe link 13 and the contact pressure spring 14 is arranged in the contact / separation direction of both the contacts 2 and 3. One end is connected to an intermediate point of the connection link 10 and the other end is connected to the movable contact 3 on the same axis as the axis.
The insulating rod 12 includes an insulating portion 12a for insulating the main circuit charging portion and the switch frame 4 side and upper and lower rod portions 12b and 12c.
One end of the wipe link 13 is slidably connected to the upper rod portion 12 b of the insulating rod 12, and the other end is connected to the lead-out portion 3 a of the movable contact 3.
The contact pressure spring 14 is inserted between the wipe link 13 and the insulating portion 12a of the insulating rod 12, and urges the both in a direction of expanding both.
The main circuit connecting portion 15 configured as described above receives the driving force from the rotating shaft lever 7 side to drive the movable contact 3 in the direction in which the movable contact 3 comes in contact with and away from the fixed contact 2 and is in contact with the closed contact. The pressure spring 14 serves to apply contact pressure to both the contacts 2 and 3.

  In the figure, one phase of the switch is shown. However, in the case of a plurality of phases, the vacuum switch 1 is arranged in parallel in the drawing in the direction perpendicular to the paper surface in the figure. The plurality of rotary shaft levers 7 are fixedly attached, and the ends thereof are individually connected to the connecting link 10 and the main circuit connecting portion 15, and the plurality of vacuum switches 1 are collectively driven by the operating device 5. Is done.

Next, the opening / closing operation of the switch will be described first from the closing operation.
FIG. 1 shows an open state. When a closing operation is performed in accordance with a command from the operating device 5 from this state, the rotating shaft 6 rotates counterclockwise. As a result, the rotation shaft lever 7 rotates counterclockwise, and the connection link 10 connected via the intermediate link 8 rotates clockwise around the fulcrum 16 of the movable bearing 9 to connect the main circuit. The part 15 (insulating rod 12, wipe link 13, contact pressure spring 14) moves upward in the figure to move the movable contact 3 to the fixed contact 2 side.
When the movable contact 3 comes into contact with the fixed contact 2, the movement of the movable contact 3 and the wipe link 13 stops, but the insulating rod 12 moves further upward while compressing the contact pressure spring 14. Then, the contact pressure spring 14 is compressed by a predetermined wipe dimension A, and a contact pressure necessary for flowing a prescribed current to both the contacts 2 and 3 is applied to complete the closing operation, as shown in FIG. It becomes a closed state.

Next, the opening operation will be described.
When the closed contact is released by the operating device 5 from the state of FIG. 2, the insulating rod 12, the connecting link 10, the intermediate link 8, the rotating shaft lever 7 and the rotating shaft 6 are first applied by the biasing force of the contact pressure spring 14. Operates in the opposite direction to the closing operation. When the bolt portion at the tip of the upper rod portion 12b of the insulating rod 12 abuts against the wipe link 13 and the urging force of the contact pressure spring 14 disappears, the rotating shaft 6 is urged to the open state. A rotating shaft 6 is rotated clockwise by a spring (not shown), each part operates in a direction opposite to the closing operation, the main circuit connecting part 15 moves downward, and both contacts 2 and 3 are moved. A contact opening state as shown in FIG. 1 is obtained.

Next, the case where the contact pressure of the contactor is adjusted by the contact pressure adjusting mechanism, which is a feature of the present invention, will be described.
In the closed state shown in FIG. 2, the stationary contact 2 and the movable contact 3 are in contact with each other at a predetermined contact pressure in a normal state. If the contact pressure spring 14 is not compressed to an appropriate state due to an error in the size of parts in the switch, it is necessary to adjust the compression amount of the contact pressure spring 14.
FIG. 3 is a diagram showing a case where the contact pressure is insufficient. In the closed state, the wipe dimension A shown in FIG. 2 is not secured, and both the contacts 2 and 3 are not in contact with a predetermined contact pressure. It has become.

  In such a case, the nut 11 of the adjustment screw 9a portion of the movable bearing 9 is rotated to displace the movable bearing 9 upward in the drawing. As a result, the connecting link 10 rotates counterclockwise around the connection point with the intermediate link 8, and the insulating rod 12 connected to the connecting link 10 moves upward to compress the contact pressure spring 14. Go. By appropriately rotating the nut 11 of the adjustment screw 9a, the contact pressure spring 14 is compressed and adjusted to an appropriate state (wiping dimension A is ensured).

  When the contact pressure is excessive, the contact pressure adjustment method is to displace the movable bearing 9 downward by rotating the nut 11 of the adjustment screw 9a. As a result, the connecting link 10 rotates clockwise with the connection point with the intermediate link 8 as a fulcrum, and the insulating rod 12 connected to the connecting link 10 moves downward to release the contact pressure spring 14. Go. By adjusting the nut 11 appropriately, the contact pressure spring 14 is adjusted to be released to an appropriate state.

  In the above description, the main circuit connecting portion 15 is connected from the movable contact 3 side in the order of the wipe link 13, the contact pressure spring 14, and the insulating rod 12. Then, the insulating rod 12, the contact pressure spring 14, and the wipe link 13 may be connected from the movable contact 3 side.

As described above, according to the invention of the present embodiment, the contact pressure spring is provided at the intermediate portion of the connecting link having one end connected to the rotary shaft lever via the intermediate link and the other end pivotally supported by the movable bearing. Since the contact pressure of both contacts can be adjusted by connecting the main circuit connecting part having the movable bearing and displacing the movable bearing, the main circuit connecting part which is the moving part has no adjusting part, so the main circuit side is The contact pressure adjustment work can be performed without operation, and the adjustment work can be easily performed in a short time.
In addition, since the movable part can be simplified and reduced in size and weight, the operation speed of the movable contact can be increased, and the current interruption performance can be improved.

  The movable bearing is fastened to the switch frame on which the switch is supported by an adjustment screw, and the movable bearing can be displaced by adjusting the screwing length of the adjustment screw. It can be easily adjusted. In particular, even in the case of a plurality of phases, each phase can be easily aligned, so that workability is improved.

It is a schematic block diagram of the switch provided with the contact pressure adjustment mechanism of the switch by Embodiment 1 of this invention, and is a figure which shows an open state. It is a schematic block diagram of the switch provided with the contact pressure adjustment mechanism of the switch by Embodiment 1 of this invention, and is a figure which shows a closing state. It is explanatory drawing explaining the case where the contact pressure of a contactor is insufficient in the contact pressure adjustment mechanism of the switch by Embodiment 1 of this invention. It is a schematic block diagram of the switch provided with the conventional contact pressure adjustment mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum valve (switch) 2 Fixed contact 2a Deriving part 3 Movable contactor 3a Deriving part 4 Switch frame 5 Operating device 6 Rotating shaft 7 Rotating shaft lever 8 Intermediate link 9 Movable bearing (movable support) 9a Adjustment Screw 10 Connecting link 11 Nut 12 Insulating rod 12a Insulating portion 12b Upper rod portion 12c Lower rod portion 13 Wipe link 14 Pressure spring 15 Main circuit connecting portion 16 Support point.

Claims (3)

A rotating shaft that rotates in response to the opening or closing operation of the switch;
A rotation axis lever fixed to the rotation axis and rotating together with the rotation axis;
A connecting link having one end connected to the pivot shaft lever via an intermediate link and the other end pivotally supported by the movable support;
It has an insulating rod, wipe link and contact pressure spring, and is arranged on the same axis as the axis of contact and separation of the fixed contact and movable contact of the switch, and one end is connected to the intermediate part of the connecting link. the other end is connected to the front asked moving contacts, contacts the two contacts by the contact pressure spring to the movable contactor by a driving force from the rotation shaft lever closing time with driving the contact and separation direction A main circuit connecting portion for applying pressure,
By displacing the movable support body in a direction parallel to the contact / separation direction of the two contactors, the main circuit connecting portion connected to the connection link moves in the contact / separation direction of the two contactors, and the contact pressure The contact pressure adjustment mechanism for a switch, characterized in that the adjustment of the pressure is possible.   2. The contact pressure adjusting mechanism for a switch according to claim 1, wherein the movable support is a movable bearing.   3. The contact pressure adjusting mechanism for a switch according to claim 2, wherein the movable bearing is fastened by an adjustment screw to a switch frame on which the switch is supported, and the movable screw is adjusted by adjusting a screwing length of the adjustment screw. A contact pressure adjusting mechanism for a switch, wherein the bearing can be displaced.

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