JP2895474B1 - Vacuum valve operation mechanism - Google Patents

Abstract

An object of the present invention is to provide a vacuum valve operating mechanism that can be reduced in size by reducing its width. According to the present invention, a contact pressure supply spring (13) is provided at the tip of an insulating rod (10) extending in the axial direction of a movable electrode rod (4) to open and close a movable contact (8) to a fixed contact (9) in a vacuum vessel (5). A built-in case 11 is provided, and the tip of the lever 2 is connected to the tip of the case 11 in a state of swinging in the axial direction,
In a vacuum valve operating mechanism in which a torsion coil spring 22 is arranged along the side surface of the lever 2, the lever 2 is formed in a plate shape, and a pair of slits 16 for inserting the tip of the lever 2 is formed at the tip of the case 11. A connecting pin 18 for supporting the contact pressure supply spring 13 is provided at the portion where the lever 2 is housed in the slits 16, and the tip of the lever 2 is housed in both slits 16.
The lever 2 is provided so as to intersect with the longitudinal direction and the axial direction, and both ends of the connecting pin 18 are bridged between opposing portions of the front end of the case 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve operating mechanism used for a vacuum valve type switching switch of a load tap changer which is a component of a transformer or a voltage regulator. The present invention relates to a vacuum valve operating mechanism for reciprocating a movable electrode rod with respect to a fixed electrode rod in a vacuum vessel.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, a vacuum valve operating mechanism changes the rotational movement of a plate cam 81 into a swinging movement of a lever 82 in a vertical direction, which is converted into a contact pressure supply spring 83.
The movable electrode rod 85 is changed to a vertical movement through a case 84 in which a movable electrode 86 and a fixed electrode rod 8 are fixed.
7 for opening and closing the fixed contact 88. Further, in order to supply a desired current to both electrode rods, the vacuum valve 89 ensures that the fixed contact and the movable contact are in surface contact with each other in the closed state, and presses the movable contact against the fixed contact with a constant pressure. It is necessary to be. The pressing pressure is performed by the above-described contact pressure supply spring, and the surface contact of the contact is ensured by accurately moving the movable electrode bar up and down in the axial direction of the fixed electrode bar.

[0003] Accurate vertical movement of the movable electrode bar requires swinging the case up and down while holding the case so as not to move in the front and rear and left and right directions. For this reason, conventionally, FIG.
And as shown in FIG. 9, the case is held between the forked pieces 90 branched from the middle part to the front part of the lever so as to sandwich the case, thereby restraining the shake of the case in the left-right direction.
Connect both ends of the connecting pin 91 erected in the lateral direction of the case,
By connecting to each of the above-mentioned forked portions, the shake of the case in the front-back direction is restrained. A torsion coil spring 92 is provided on the side surface of the lever to make contact with the cam and to operate effectively when the electrode is opened.

[0004]

When the transformer or the voltage regulator is mounted on a utility pole, it is desirable that the transformer and the voltage regulator have a compact structure in order to secure a stable mounting state. For this reason, the present inventor worked on downsizing of the vacuum valve operating mechanism, and in order to reduce the horizontal width shown in FIG. 8, the shape of the lever, the degree of connection between the lever and the case, and further, the torsion coil spring We considered a structure to prevent the winding tube part from protruding to the side of the case. Thus, an object of the present invention is to provide a vacuum valve operating mechanism that can be downsized by reducing the width.

[0005] In addition, a three-phase three-wire system is generally used as a power transmission system in Japan, and a vacuum valve switching switch requires at least three vacuum valves per phase. For this reason, as shown in FIG. 8, the vacuum valve type switching switch is provided with vacuum valves arranged in parallel at intervals and each vacuum valve is provided with the operating mechanism. If the diameter (width) of the vacuum valve is smaller than the width of the operating mechanism,
The distance between the valves is determined by the width of the operating mechanism. SUMMARY OF THE INVENTION An object of the present invention is to reduce the lateral width of an operation mechanism, thereby greatly reducing the lateral width as a switching switch when a vacuum valve having a small diameter is used.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a tip of an insulating rod extending in the axial direction of a movable electrode rod for opening and closing the movable contact of the movable electrode rod in a fixed contact of the fixed electrode rod in a vacuum vessel. The case has a built-in contact pressure supply spring, and the tip of the lever is connected to the tip of the case in a state where the tip swings in the axial direction. In a vacuum valve operating mechanism along which a coil spring is arranged, a lever is formed in a plate shape, and a pair of slits for inserting the tip of the lever are provided opposite to the tip of the case, and the tip of the lever is provided in both slits. And a connecting pin for supporting the contact pressure supply spring is provided at a portion where the lever is housed in such a manner as to intersect the longitudinal direction of the lever and the axial direction. Between the opposite parts of the The features.

The lever is used in a state where the thickness direction is parallel to the connecting pin. When the thickness width direction is the horizontal direction, the thickness portion of the lever is within the width of the case. Similarly, the torsion coil spring is arranged along the side surface of the lever, so that at least a part of the winding width portion is within the width of the case. Further, in the vacuum valve operating mechanism of the present invention, the tip of the lever is inserted into the slit of the case, and furthermore, both ends of the connecting pin provided at the portion inserted into the slit are bridged over the case. The case can be moved up and down in a state in which the case does not move in the front-rear and left-right directions. As a result, the movable electrode rod can be moved up and down accurately, and thus, when the fixed contact and the movable contact are in a closed state, they are brought into surface contact. be able to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vacuum valve operating mechanism 10 according to the present invention.
Numeral 0 changes the rotational movement of the plate cam 1 into a swinging movement of the lever 2 in the vertical direction as shown in FIG. 1, and changes it into a vertical movement of the movable electrode rod 4 of the vacuum valve 3.

The vacuum valve 3 is provided so as to hang down from the frame F. The upper part of the movable electrode rod 4 protrudes into the lower part of the vacuum container 5, and the upper part of the vacuum container 5 has the fixed electrode rod 6.
The bellows 7 is fixed to the upper part of the movable electrode rod 4 and the other end is fixed to the inner surface of the bottom of the vacuum vessel 5. The vacuum valve 3 includes a movable contact 8 provided at the upper end of the movable electrode rod 4 and a fixed contact provided at the lower end of the fixed electrode rod 6 by moving the movable electrode rod 4 up and down along the axial direction of the fixed electrode rod 6. 9 is opened and closed. Further, an insulating rod 10 is extended downward from the lower end of the movable electrode rod 4, and a case 11 connected to the lever 2 is fixed to the lower end of the insulating rod 10 in a suspended state. The ring-shaped guide 12 fixed to the outer surface of the bottom of the vacuum vessel 5
Is for inserting and guiding the upper part of the movable electrode rod 4 inside. The above structure is the same as the conventional one.

As shown in FIG. 2, the case 11 has a built-in supply spring 13 for applying a contact pressure to the movable contact 8 to the fixed contact 9, and has a downwardly open topped cylindrical shape. The connection between the case 11 and the insulating rod 10 is such that the lower end of the insulating rod 10, which is slightly narrower than the upper side, protrudes into the inside from the top wall 14 of the case, and the nut 15 is screwed into the protruding portion to be fixed. is there. The connection between the case 11 and the lever 2 is as follows. Slits 16 that open downward are provided in the front and rear opposing portions of the lower portion of the case 11 (see FIGS. 3 and 4).
By inserting the tip of the case 11, the case 11 is held in such a manner that it hardly shakes in the left-right direction. As shown in FIGS. 1 and 4, a hole 17 is formed in the lower part of the case 11 at a location facing the direction perpendicular to the longitudinal direction of the lever 2 (lateral direction).
, Respectively, while, as shown in FIGS. 2 and 3,
The case 11 is held in the middle of the connecting pin 18 provided between the two holes 17 by penetrating one part of the portion of the lever 2 housed in the case, so that the case 11 hardly moves in the front-rear direction. . The slit 16 and the hole 17 are formed to have a lateral width in which the lever 2 and the connecting pin 18 can be fitted almost without looseness, and the hole 17 is formed to be long in the vertical direction. In order to prevent the connecting pin 18 from falling out of the lever 2, a split pin or the like is inserted at the ends of both ends so that both split pins come into contact with the side surface of the case 11.

The supply spring 13 is accommodated between the top wall 14 and the connecting pin 18 in a compressed state.
As shown in the figure, the case 11 is formed in such a size that there is almost no deviation in the front-rear and left-right directions, and the bottom side thereof is two points on the connecting pin 18, that is, the bottom is equally divided into two sides. So, they are well-balanced.

The lever 2 has a plate shape and is used in a state where it is raised in the vertical direction. The lever 2 is inserted into a fixed shaft 19 extending in a direction parallel to the connecting pin 18 from the frame F, and an intermediate portion thereof is inserted. By holding immovable to
It is swingably supported. The portion supported by the fixed shaft 19 is formed to be thicker than the other portions, but the thickness is set so as to fit within the width of the case when the tip of the lever 2 is used through the slit 16. Is set to As shown in FIGS. 1 and 4, the lever 2 rotatably supports a roller 20 abutting on the plate cam 1 via a support shaft 21 at a base end thereof, and a torsion coil spring on the fixed shaft 19. 22 is provided so that the coil spring 22 extends along one side surface of the lever 2.
Are hooked on horizontal locking pins 24 provided above the lever 2 and below the front end of the lever 2, respectively.
, The roller 20 is pressed against the plate cam 1. The roller 20 is supported so as to fit within a width connecting both ends of the connecting pin 18. The locking pin 24 provided above the lever 2 projects from the frame F. Also, the force of the coil spring 22 is
When the electrode is changed from the closed state to the open state, it is a force to pull the movable electrode rod 4 downward. Further, when the lever 2 is swung up and down, the upper side of the distal end of the lever 2 is moved so that the upper side of the distal end of the lever 2 does not contact the bottom surface of the supply spring 13 except for the connection pin 18. , Formed low.

The plate cam 1 rotates about a pivot 25 parallel to the fixed shaft 19. The plate cam 1 pulls down the movable electrode rod 4 at a portion having a short outer diameter and pushes up the movable electrode bar 4 at a portion having a long outer diameter.

In the above-described vacuum valve operating mechanism, the connecting pin 18 is constantly pressed downward by the force of the torsion coil spring 22, and when the fixed contact 9 and the movable contact 8 are in the open state, as shown in FIG. The position of the connecting pin 18 is the hole 17
5 when both contacts 8 and 9 are closed.
As shown in the figure, the contact pressure is applied to both contacts 8 and 9 by the supply spring 13 above the hole 17. The vacuum valve operating mechanism holds the upper part of the movable electrode rod 4 immovably in the front-rear and left-right directions by the guide 12, and the case 11, which can be said to be the lower part of the movable electrode rod 4, is moved back and forth by the connecting pin 18 and the lever 2. Since the movable electrode rod 4 is held immovably in the left-right direction, the movable electrode rod 4 can be moved up and down accurately along the axial direction of the fixed electrode rod 6. The vacuum valve operating mechanism 1
As shown in FIG. 3, three reference numerals 00 are provided in parallel on a fixed shaft 19 provided between left and right frames F with a space therebetween, thereby forming a switching portion of a switching switch. .

[0015]

According to the vacuum valve operating mechanism of the present invention, the tip of the plate-like lever is housed in the slit of the case.
A part of the width of the torsion coil spring along the side of the lever is within the case width, while the conventional mechanism is
Since the torsion coil spring is arranged along the side of the lever that protrudes from the width of the case, both sides of the case are sandwiched between the levers, the present invention is compared with the conventional mechanism by these synergistic effects. The width becomes much smaller, and as a result, it becomes compact. In addition, since the width of the vacuum valve operating mechanism is reduced, the width of the switching switch provided with at least three vacuum valves in parallel per phase is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a vacuum valve operating mechanism of the present invention.

FIG. 2 is a partially cut-away enlarged side view showing a connection state between a case and a lever in FIG. 1;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a side view showing a position of a connecting pin when the vacuum valve operating mechanism is in a closed state.

FIG. 6 is a side view showing a conventional vacuum valve operating mechanism.

FIG. 7 is a partially cut-away enlarged side view showing a connection state between a case and a lever in FIG. 6;

FIG. 8 is a front view of FIG. 6;

FIG. 9 is a sectional view taken along line BB of FIG. 8;

[Explanation of symbols]

 2 Lever 4 Movable electrode rod 5 Vacuum container 6 Fixed electrode rod 8 Movable contact 9 Fixed contact 10 Insulating rod 11 Case 13 Contact pressure supply spring 16 Slit 18 Connection pin 22 Torsion coil spring

Claims (1)

(57) [Claims] 1. A fixed contact (9) of a fixed electrode rod (6) and a movable contact (8) of a movable electrode rod (4) in a vacuum vessel (5).
A contact pressure supply spring (1) is attached to the tip of an insulating rod (10) extending in the axial direction of the movable electrode rod (4) to open and close the movable electrode.
A case (11) having a built-in 3) is provided.
The tip of the lever (2) is connected to the tip of the lever (2) so that the tip swings in the axial direction, and a torsion coil spring (22) is arranged along the side surface of the lever (2). In the vacuum valve operating mechanism, the lever (2) is formed in a plate shape, and a pair of slits (16) for inserting the tip of the lever (2) is provided at the tip of the case (11) so as to face each other. The connecting pin (18) supporting the contact pressure supply spring (13) is attached to the portion of the lever (2) in which the tip of the lever (2) is stored in the lever (2). A vacuum valve operating mechanism, wherein the connecting pin (18) is provided so as to intersect with the direction and the axial direction, and both ends of the connecting pin (18) are bridged between opposed portions at the front end of the case (11).