JP2012048868A - Operation mechanism of vacuum circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an operation mechanism of a vacuum circuit breaker which drives a vacuum valve to electrode opening and electrode closing positions associatively with an opening/closing lever so as to reduce control force by making lightweight a support member and a connecting rod, constituting a contact pressurization mechanism of the operation mechanism, and so as to obtain high response characteristics of feeding and separating operations.SOLUTION: In the operation mechanism in which an insulation rod coupled to a movable electrode of the vacuum valve, and the opening/closing lever 11 are linked and coupled to each other through the contact pressurization mechanism comprising an assembly of a support member 9, a compression coil spring 10 for contact pressurization, and a connecting rod 17, and which drives the vacuum valve to the electrode opening and electrode closing positions through rotational operation of the opening/closing lever 11, the contact pressurization mechanism comprises an assembly of a spring seat 18 coupled to the connecting rod 17, a support member 9 which has a pair of connecting plates 20 implanted in the center of a spring seat 19 opposed to the spring seat, and fitted in a guide hole 18a bored in the upper spring seat 18 to be suspended with a connecting pin 12 of the opening/closing lever 11, and the compression coil spring 10 for contact pressurization interposed between the spring seats 18 and 19 while surrounding the connecting plate 20.

Description

  The present invention relates to an operation mechanism of a vacuum circuit breaker, and more particularly to an assembly structure of a contact pressurizing mechanism that presses a contact of a movable electrode against a contact of a fixed electrode at a position where a vacuum valve is turned on.

  First, the configuration of the head vacuum circuit breaker is shown in FIGS. 3 and 4 (see, for example, Patent Document 1). In each figure, 1 is a vacuum valve, 2 is a fixed electrode of the vacuum valve 1, 3 is a movable electrode, 4 is a fixed side terminal connected to the fixed electrode 2 and pulled out behind the vacuum valve 1, 5 is a movable electrode 3 A movable terminal connected via the flexible conductor 6, an insulating rod 7 connected to the movable electrode 3 via the operating shaft 8, a support member 9 connected to the lower side of the insulating rod 7, and an insulating rod 7 A compression coil spring for pressurizing the contact interposed between the support member 9 and the support member 9; 11 is an open / close lever having one end connected to the support member 9 via a connection pin 12; and 13 is a vacuum for U, V and W phases. An opening / closing shaft (cross bar) common to the valve 1, 14 is an opening spring (tensile coil spring), 15 is a tripping latch, and 16 is an operation unit that houses an operation mechanism.

  The vacuum circuit breaker has a manual operation method and an electric operation method. In the manual operation method, the open / close lever 11 is rotated counterclockwise by an operation handle (not shown) arranged on the front surface of the operation unit 16 to store the opening spring 14. When the closing button is pressed in this state, the front end surface of the latch 15 engages with a roller 11a provided on the opening / closing lever 11, and the opening / closing lever 11 is locked in the closing position. In the electric operation method, an electric motor (not shown) built in the operation unit 16 stores the opening spring 14.

  When the tripping operation is performed in the illustrated closed state, the latch 15 that has locked the opening / closing lever 11 in the closing position is released, and the opening / closing lever 11 has a release spring force of the opening spring 14 with the opening / closing shaft 13 as a fulcrum. Is rotated clockwise to open the movable electrode 3 of the vacuum valve 1.

  In the closing operation process for closing the movable electrode 3 of the vacuum valve 1, the compression coil previously described by the counterclockwise rotation of the opening / closing lever 11 after the contact of the movable electrode 3 contacts the contact of the fixed electrode 2. The spring 10 is compressed, and in the applied state, contact pressure is applied between the contact points of the fixed electrode 2 and the movable electrode 3 by receiving the compression spring force.

  Next, the conventional structure of the contact pressurizing mechanism including the support member 9 that links the insulating rod 7 and the opening / closing lever 11 and the compression coil spring 10 for pressurizing the contact that is assembled to the support member 9 will be described. As shown in FIG.

  5 (a) and 5 (b), the support member 9 has a structure in which a steel plate is bent into a U shape, and a guide shaft hole through which a connecting rod 17 described later is passed at the center of the bottom, and a contact pressurizing member. A lower spring seat 9a for receiving the compression coil spring 10 is formed, and is pivotally supported through a connecting pin 12 of the opening / closing lever 11 in a pin hole drilled in the upper end of the fork. On the other hand, a connecting rod 17 is coupled to the insulating rod 7, and the lower end of the connecting rod 17 is inserted into the guide shaft hole of the support member 9 and then drilled on the upper shaft of the connecting rod 17. The connecting pin 12 is loosely fitted in the long hole 17a. Further, a step portion is formed at the middle position of the connecting rod 17 to hold a spring seat 18 of the compression coil spring 10, and between the spring seat 18 and the spring seat 9 a provided at the bottom of the support member 9. The compression coil spring 10 is held in a compressed state.

  With the above-described structure, when the opening / closing lever 11 is turned counterclockwise with the opening / closing shaft 13 as a fulcrum by the closing operation of the vacuum circuit breaker, the support member 9 is pulled upward via the connecting pin 12. Thereby, the movable electrode 3 of the vacuum valve 1 comes into contact with the fixed electrode 2 through the compression coil spring 10, the connecting rod 17, and the insulating rod 7, and when the opening / closing lever 11 further rotates from here, the compression coil spring 10 is moved. When compressed, the spring load presses the movable electrode 3 against the fixed electrode 2 and applies the necessary contact pressure between the contacts.

JP 2007-110823 A

  The vacuum circuit breaker is required to have high responsiveness for the operation and release operation by the operation mechanism. For this purpose, when a trip command is given in a state where the opening spring 14 is stored by manual operation or electric operation, the movable electrode 3 of the vacuum valve 1 is moved to the opening position by the spring force of the opening spring 14. It is necessary to drive at high speed.

  In this regard, in the conventional vacuum circuit breaker described above, the contact pressure mechanism (see FIG. 5) that presses the movable electrode 3 against the fixed electrode 2 at the position where the vacuum valve 1 is turned on holds the compression coil spring 10 from the outer peripheral side. A long U-shaped connecting rod 17 is combined with a wide U-shaped support member 9 to hold the compression coil spring 10 therebetween. For this reason, the size of the component is increased, and the weight of the movable part of the contact pressurizing mechanism is increased.

  In addition, during the tripping operation that opens the vacuum valve 1, the mass of the support member 9, the compression coil spring 10, and the connecting rod 17 is applied to the opening / closing lever 11 as a load load (moment load). When the weight of the mechanism is increased, the opening of the vacuum valve 1 is delayed due to the influence of the inertial mass, and the response of the tripping operation is lowered. If a spring having a high spring constant is employed for the opening spring 14 in order to compensate for this decrease in responsiveness, a large operating force (manual operation, electric operation) is required to store the opening spring 14. .

  The present invention has been made in view of the above points, and an object of the present invention is to provide a support member that constitutes a contact pressure mechanism for an operating mechanism that opens a vacuum valve in conjunction with an open / close lever and drives it to a closed position, An object of the present invention is to provide an improved vacuum circuit breaker operating mechanism that reduces the weight of the connecting rod, reduces the operating force applied to the open / close lever, and provides a high response characteristic of the tripping operation.

In order to achieve the above object, according to the present invention, a movable electrode of a vacuum valve is connected to a connecting rod connected to an insulating rod, a support member guided and supported by the connecting rod, and between the connecting rod and the support member. The movable electrode is linked to the open / close lever via a contact pressurizing mechanism comprising an assembly of compression coil springs for interposing contact pressurization, and the movable electrode is closed by rotating the open / close lever in response to an input / trip command. In the operation mechanism of the vacuum circuit breaker that is driven to the open position,
A pair of connecting plates in an upright position at the center of the upper spring seat coupled to the tip of the connecting rod and the lower spring seat facing the spring seat; A support member in which the upper end of the connection plate is pivotally supported on the connection pin of the open / close lever after the connection plate is inserted into a guide slot formed in the upper spring seat and guided and supported so as to be vertically slidable; The support member is composed of an assembly of a compression coil spring for pressurizing a contact that surrounds the connecting plate of the support member and is interposed between an upper spring seat and a lower spring seat (Claim 1). .

  Further, in the above configuration, in order to prevent the connecting rod from interfering with the connecting pin of the opening / closing lever, an elongated hole is formed on the shaft of the connecting rod coupled to the insulating rod, and the connecting pin of the opening / closing lever is inserted into the elongated hole. Is loosely fitted (claim 2).

  According to the above configuration, the support member and the connecting rod constituting the contact pressure mechanism of the vacuum valve can be reduced in size and weight as compared with the conventional structure, and an operation mechanism excellent in the responsiveness of the tripping operation can be obtained. .

It is the assembly structure of the contact pressure mechanism by the Example of this invention, Comprising: (a) is a front view, (b) is a side view of (a). FIG. 2 is a structural diagram of a connecting rod and an upper spring seat in FIG. 1, (a) is a front view, (b) is a side view, and (c) is an AA cross-sectional view of (b). It is a whole block diagram of the conventional vacuum circuit breaker. FIG. 4 is a plan layout view of vacuum valves and open / close levers for each phase in FIG. 3. It is the conventional structure figure of the contact pressure mechanism in FIG. 3, Comprising: (a), (b) is a front view and a side view, respectively.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 5, and the description is abbreviate | omitted.
The contact pressurizing mechanism of the illustrated embodiment is basically the same as the conventional structure shown in FIG. 5, but a support member that holds the compression coil spring 10 for pressurizing the contact by being suspended on the connecting pin 12 of the open / close lever 11. 9 and the assembly of the connecting rod 17 coupled to the insulating rod 7 (see FIG. 5) and linked to the support member 9 and the upper spring seat 18 are configured as follows.

  That is, the support member 9 in the illustrated embodiment includes a disk-shaped lower spring seat 19 that receives the lower end of the compression coil spring 10, and a left and right that extends upward by connecting the lower end to the central portion of the spring seat 19. A pair of connecting plates 20 is assembled, and a pin hole that is pivotally supported on the opening / closing lever 11 through the connecting pin 12 of the opening / closing lever 11 is drilled at the upper end of the connecting plate 20. On the other hand, the connecting rod 17 is shorter than the conventional structure (see FIG. 5), and a disk-shaped upper spring seat 18 for receiving the upper end of the compression coil spring 10 is directly coupled to the lower end thereof. Here, an elongated hole 17a in the vertical direction is formed in the connecting rod 17 so as to penetrate the side surface of the rod shaft, and the connecting pin that is passed through the elongated hole 17a at the tip of the opening / closing lever 11 at the assembly position in FIG. 12 is loosely fitted. Further, guide groove holes (square holes) 18 a into which the pair of connecting plates 20 are inserted are formed on the plate surface of the spring seat 18 on both the left and right sides of the connecting rod 17.

  In order to assemble the contact pressurizing mechanism using the above-described components, first, the compression coil spring 10 is fitted on the outer peripheral side of the connecting plate 20 and is supported on the lower spring seat 19 and connected in this state. The plate 20 is inserted into the guide slot 17a of the upper spring seat 18 coupled to the connecting rod 17, and is guided and supported so as to be slidable up and down. Next, the assembly of the support member 9 and the connecting rod 17 is aligned with the tip of the opening / closing lever 11, and the pin hole of the connecting plate 20 and the long hole of the connecting rod 17 are maintained while the compression coil spring 10 is compressed at this position. The open / close lever 11 is linked to the open / close lever 11 through the connecting pin 12 of the open / close lever 11. Thereafter, the connecting rod 17 is connected to the movable electrode 3 of the vacuum valve 1 via the insulating rod 7 (see FIG. 3).

  The operation and function of the contact pressurizing mechanism with the above configuration is the same as that of the conventional structure shown in FIG. 5, and the opening / closing lever 11 rotates to close and open the movable electrode 3 of the vacuum valve 1 during the closing and releasing operations. Drive to the pole position. Further, during the closing operation, the compression coil spring 10 is compressed via the connecting plate 20 and the spring seat 19 by the counterclockwise rotation of the opening / closing lever 11, and the upper spring seat is caused by the spring load. 18, the movable electrode 3 of the vacuum valve 1 is pressed against the fixed electrode 2 through the connecting rod 17 and the insulating rod 7, and contact pressure is applied between the contacts of the movable and fixed electrodes. In this case, the support member 9 is guided so that the connecting plate 20 is inserted into the guide groove 18a of the upper spring seat 18 so as to slide up and down.

  Further, in the contact pressing mechanism of the illustrated embodiment, the axial length of the connecting rod 17 to which the upper spring seat 18 is coupled can be reduced to half or less compared to the conventional structure shown in FIG. In addition, the support member 9 that holds the compression coil spring 10 for pressurizing the contact is disposed on the inner side of the compression coil spring 10 and a pair of connection plates 20 that are implanted in the lower spring seat 19, and the connection plate 20. The upper spring seat 18 into which the upper end is fitted is used as a guide member so as to be guided and supported relative to the connecting rod 17 so as to be slidable up and down, and is smaller and more compact than a U-shaped support member having a conventional structure. As a result, the weight of the movable part constituting the contact pressurizing mechanism is light and the inertial mass thereof is small, so that the responsiveness of the tripping operation for opening the vacuum valve 1 is improved and the breaking performance of the vacuum circuit breaker is improved. improves.

DESCRIPTION OF SYMBOLS 1 Vacuum valve 7 Insulating rod 9 Support member 10 Compression coil spring 11 for contact pressurization 11 Opening / closing lever 12 Connecting pin 13 Opening / closing shaft 14 Opening spring 17 Connecting rod 17a Long hole 18 Upper spring receiving seat 18a Guide groove hole 19 Lower side Spring seat 20 connecting plate

Claims (2)

An assembly of a connecting electrode connected to an insulating rod, a support member guided and supported by the connecting rod, and a compression coil spring for pressurizing a contact interposed between the connecting rod and the support member. A vacuum circuit breaker that is linked to an open / close lever via a contact pressurizing mechanism and that drives the movable electrode to a closed or open position by rotating the open / close lever in response to an input / trip command. In the operation mechanism,
A pair of connecting plates in an upright position at the center of the upper spring seat coupled to the tip of the connecting rod and the lower spring seat facing the spring seat; A support member in which the upper end of the connection plate is pivotally supported on the connection pin of the open / close lever after the connection plate is inserted into a guide slot formed in the upper spring seat and guided and supported so as to be vertically slidable; A vacuum circuit breaker comprising an assembly of a compression coil spring for pressurizing a contact which surrounds the connecting plate of the support member and is interposed between an upper spring seat and a lower spring seat. Operating mechanism.   2. The vacuum circuit breaker according to claim 1, wherein a long hole is formed on a shaft of a connecting rod coupled to an insulating rod, and a connecting pin of an opening / closing lever is loosely fitted in the long hole. Operating mechanism.