JP2010232032A - Operation mechanism for gas-blast circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker, capable of materializing a long service life by preventing a component force from generating in a direction normal to the axial line of an insulating operation rod, and by preventing the guide surface to guide a part of a link mechanism from abnormally wearing, when movable portions at both circuit-breaking units are operated by the common insulating operation rod. <P>SOLUTION: A slide 15, in a planar contact with a guide surface 14a formed by a guide long groove 14, is mounted at a connecting pin 6 to connect the insulating operation rod 5 to both linking mechanisms. When driven along the axial line of the insulating operation rod 5, the slide 15 is brought into planar contact with the guide surface 14a, even if the component force is generated in the direction normal to the axial line. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an operating mechanism for a gas circuit breaker, and more particularly to an operating mechanism for a large capacity gas circuit breaker having a large operating force.

  In a large-capacity gas circuit breaker configured to open and close the two shut-off parts with a common operating device, each of the shut-off part movable parts is arranged oppositely, and a link mechanism connected to each of the shut-off part movable parts is provided. There is known a configuration in which a common operating device provided on the ground side is connected to both link mechanisms via a common insulating operating rod (see, for example, Patent Document 1). In the case of such a configuration, the insulating operating rod is driven in the axial direction by the operating device, and the both movable parts of the blocking part are driven to open and close via both link mechanisms. In addition, an increase in weight associated with an increase in the size of the blocking portion results in an operating device that generates a larger operating force, and an operation mechanism that connects the insulating operating rod and the moving portion of the blocking portion needs to be configured more firmly.

JP-A-5-314872

  By the way, in a link mechanism or the like, a guide pin is configured by engaging a connecting pin in a slidable relationship in a guide long groove that guides the operation direction, or by providing a rotatable guide roller on the connecting pin. It is conceivable to employ this guide mechanism in the operation mechanism for the large capacity gas circuit breaker described above. However, when the above-described guide mechanism is adopted as the operation mechanism for the large-capacity gas circuit breaker, the outer periphery of the guide roller is in point contact with the guide surface of the guide long groove. In reality, even if the movable parts and the link mechanism of both shut-off parts are manufactured identically, deviations occur due to manufacturing errors, etc., and the operating force is driven by driving a common insulating operating rod in the axial direction. It is found that even if the transmission is transmitted, a component force is generated in a direction perpendicular to the axis of the insulating operation rod, and the guide surface in point contact with the guide roller is abnormally worn.

  An object of the present invention is to provide an operating mechanism for a gas circuit breaker that prevents abnormal wear of a sliding portion in a guide mechanism and extends its life.

  In order to achieve the above-mentioned object, the present invention provides a bracket that supports two movable portions to be opened and closed, a common insulating operation rod that is driven in the axial direction by an operating device connected to one end thereof, A guide having a link mechanism that connects the other end side of the insulating operation rod and the movable portions of the blocking portions, and a common connection pin for connecting the link mechanism and the insulating operation rod is formed on the bracket. In the gas circuit breaker operating mechanism configured to guide along the surface, a slider attached to the connecting pin is provided, and the slider is configured to have a flat surface slidably in contact with the guide surface. It is characterized by that.

  According to the operating mechanism for a gas circuit breaker of the present invention, the slider is provided so as to slidably come into surface contact with the guide surface. Therefore, even if a component force in a direction perpendicular to the operation axis of the insulating operating rod is generated, the slider Surface contact with the guide surface and the surface pressure can be kept below the allowable value, reducing abnormal wear of the guide surface and extending its life, and suppressing the generation of metal powder from the sliding part Therefore, it can be prevented that the metal powder has an adverse effect on the insulating gas holding the insulation between the power application section and the sealed tank and the dielectric strength is reduced.

FIG. 1 is a front view showing a gas circuit breaker operating mechanism according to an embodiment of the present invention. It is the front view which carried out a cross section of a part of operation mechanism for gas circuit breakers shown in FIG. It is the perspective view which expanded the principal part of the operation mechanism for gas circuit breakers shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 is a front view showing the main part of the operating mechanism for a gas circuit breaker according to one embodiment of the present invention. In a closed tank (not shown) filled with an insulating gas, there is a bracket 2 that is electrically insulated from the closed tank by an insulating support cylinder 1 and supported and fixed. is doing. For example, in the puffer type shut-off part, the piston 4 that slidably supports the puffer cylinder 3 that is the shut-off part movable part is fixed to constitute a two-point cut. An operating device (not shown) is disposed outside the closed tank, and a common insulating operating rod 5 having one end connected to the operating device is provided in the middle of an operating system that transmits the operating force from the operating device while keeping the airtightness of the closed tank. It is arranged. The other end of the insulating operation rod 5 is located in the vicinity of the bracket 2, and a blocking portion movable part, for example, a puffer cylinder 3 is connected to the other end via a link mechanism which will be described in detail later. The insulating operation rod 5 transmits an operating force from the operating device to the blocking portion movable portion while maintaining electrical insulation between the operating device and the closed tank and the blocking portion movable portion.

  The bracket 2 can adopt various shapes and structures, but here, for example, a pair of plate-like members arranged opposite to each other with a predetermined distance are coupled at an appropriate position, so Both link mechanisms are accommodated. The link mechanism incorporates a rotation shaft of a lever, and the rotation shaft is rotatably supported between a pair of plate-like members of the bracket 2.

  This figure shows a two-point gas circuit breaker, and since the link mechanism from the insulation operating rod 5 to the puffer cylinder 3 is almost the same configuration for the left and right objects as well as the configuration of the cutoff portion, here one of the Only the link mechanism will be described. One end of the link 7 is connected to the upper end of the insulating operation rod 5 using a common connecting pin 6, and the other end of the link 7 is connected to a triangular lever 9 for direction change using a connecting pin 8. . The other link mechanism whose detailed explanation is omitted is also connected to the insulating operation rod 5 using the common connecting pin 6 described above. The triangular lever 9 is rotatably supported on the bracket 2 by a rotating shaft 10. Further, one end of a link 12 is connected to the triangular lever 9 using a connecting pin 11, and the shaft of the puffer cylinder 3 is connected to the other end of the link 12 using a connecting pin 13.

  From the state shown in FIG. 2, when the insulating operating rod 5 is driven in the lower blocking direction along its axis by an operating device (not shown), the triangular lever 9 is rotated clockwise about the rotating shaft 10 via the link 7. And the puffer cylinder 3 is driven to the right in the horizontal direction via the link 12. In the puffer type shut-off portion, the insulating gas in the space called the puffer chamber formed by the piston 4 is compressed by the movement of the puffer cylinder 3 to the right, and this gas is compressed between the fixed contact and the movable contact (not shown). The current generated is interrupted by blowing off the arc generated by the break and extinguishing the arc.

  When performing such a shut-off operation, it is necessary for the operating device to drive the shut-off portion movable portion at high speed with a large operating force in order to cut off a large energy current. In particular, since the puffer type gas circuit breaker is configured to compress and blow the insulating gas in the puffer chamber when the current is cut off, an operating device that has a large initial acceleration and outputs a large operating force is used. In order to accurately transmit a large operating force at high speed to the interrupting part movable part, in particular, vibration is also applied to the link mechanism that mechanically connects the insulating operation rod 5 and the interrupting part movable part, and this constitutes the link mechanism. In order not to adversely affect each component, a guide mechanism for guiding a part of the operation system is provided. Next, this guide mechanism will be described.

FIG. 3 is a perspective view showing a part of the guide mechanism configured by using the connecting pin 6 connected to the upper end of the insulating operation rod 5.
A common connecting pin 6 is inserted into the upper end portion of the insulating operation rod 5, and one end of each link 7 a arranged on both sides of the insulating operating rod 5 is mechanically connected by this connecting pin 6. The other ends of the pair of links 7a are also mechanically connected by another connecting pin 8a, and the triangular lever 9a is connected between the pair of links 7a by using the connecting pin 8a. Similarly to the link 7a, links 7b are arranged on both sides of the insulating operation rod 5, and one end of the pair of links 7b is connected by the same connecting pin 6. The other end of the pair of links 7b The space is mechanically connected by a connecting pin 8b, and the connecting lever 8b is used to connect the triangular lever 9b so as to be sandwiched between the pair of links 7b. The triangular lever 9a is connected to the left blocking part movable part in FIG. 1, while the triangular lever 9b is connected to the right blocking part movable part in FIG. Sliders 15, which will be described in detail later, are attached to both ends of the connecting pin 6 that are common to the left and right blocking part movable parts.

FIG. 1 shows the bracket 2 containing the above-described link mechanism without a cross section.
On the side of the bracket 2, a guide long groove 14 extending in the vertical direction is formed at a position corresponding to the common connecting pin 6 connecting the insulating operating rod 5 and the link 7 shown in FIGS. 2 and 3. A pair of guide surfaces 14a is formed. A slider 15 connected to the connecting pin 6 is disposed in the guide long groove 14, and the slider 15 slides in surface contact along the guide surface 14a to constitute a guide mechanism.

  The axial length of the guide long groove 14 corresponds to the operating range when the slider 15 connected to the connecting pin 6 is cut off and when it is turned on. When the slider 15 is fitted in the guide long groove 14 and the operation direction of the connecting pin 6 that connects the insulating operation rod 5 and the link 7 is restricted along the guide surface 14a, the insulating operation rod 5 is moved by an operator (not shown). When driving in the axial direction, at least the upper end portion of the insulating operation rod 5 is guided to drive on the axis.

  Specifically, the connecting pin 6 is positioned above the guide long groove 14 in the inserted state of the blocking portion shown in FIGS. 1 and 2. When the insulation operating rod 5 is driven in the downward blocking direction on its axis from this throwing state, the slider 15 slides downward while contacting both side surfaces with the guide surface 14a of the bracket 2 forming the guide long groove 14. Move. In this blocking operation, the operating force from the insulating operating rod 5 is converted into the horizontal direction via the respective link mechanisms configured symmetrically and transmitted to the blocking section movable section. If the right and left target link mechanisms are completely symmetrical and the loads generated in the blocking portions are exactly the same, no horizontal component force is generated in the common connecting pin 6. However, a horizontal component force is generated due to a manufacturing tolerance or a shift in the shut-off operation timing. At this time, even if the slider 15 receives the horizontal component force, its side surface is pressed against one of the guide surfaces 14a and moves while contacting the surface. .

  Unlike the roller, the slider 15 has a cubic shape in the illustrated example, and has at least both side surfaces that are in surface contact with the guide surface 14a. Even if this occurs, the surface pressure can be kept below an allowable value by surface contact, and wear of the guide surface 14a is reduced.

  As described above, conventionally, a circular guide roller is rotatably attached to the connecting pin 6 so that the guide roller moves while rotating on the guide surface 14a of the guide long groove 14, that is, the starting frictional resistance is reduced by point contact. In the guide roller, the contact with the guide surface 14a of the guide long groove 14 is a point contact, and when the horizontal partial pressure described above is generated, the guide surface 14a is significantly worn. For this reason, there is a problem that the smoothness of the operation is lacking, and further, metal powder is generated in the case of abnormal wear and the dielectric strength is lowered.

  However, since the guide roller is the slider 15 having at least the slidable both side surfaces on the guide surface 14a as described above, when the insulating operation rod 5 is driven in the axial direction, the guide roller is orthogonal to the coaxial direction. Even if a component force is generated in the direction, the slider 15 comes into surface contact with the guide surface 14a, and the surface pressure can be suppressed to an allowable value or less. For this reason, the abnormal wear of the guide surface 14a is reduced, the generation of metal powder from the sliding portion is suppressed, and this metal powder is used as an insulating gas that maintains insulation between the charging section and the sealed tank. On the other hand, it is possible to prevent the dielectric strength from being lowered due to adverse effects.

  In the gas circuit breaker operating mechanism described above, the pair of guide surfaces 14a is obtained by forming the guide long grooves 14 penetrating the plate-like member of the bracket 2. However, the guide surfaces 14a are formed by a configuration other than the grooves. The same effect can be obtained.

  The operating mechanism for a gas circuit breaker according to the present invention is not limited to the link mechanism shown in FIG.

DESCRIPTION OF SYMBOLS 1 Insulation support cylinder 2 Bracket 3 Puffer cylinder 4 Piston 5 Insulation operation rod 6 Connection pin 7 Link 8 Connection pin 9 Triangle lever 10 Rotating shaft 11 Connection pin 12 Link 13 Connection pin 14 Guide long groove 14a Guide surface 15 Slider

Claims (1)

  A bracket that supports two movable portions to be opened and closed, a common insulating rod that is driven in the axial direction by an operating device connected to one end thereof, the other end of the insulating operating rod, A link mechanism that connects each of the movable portions of the shut-off portion and a gas that is configured to guide a common connection pin that connects the link mechanisms and the insulating operation rod along a guide surface formed on the bracket. An operating mechanism for a circuit breaker according to claim 1, wherein a slider attached to the connecting pin is provided, and the slider has a flat surface slidably in contact with the guide surface.

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