JP2010272445A - Vacuum circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum circuit breaker for suppressing chattering while containing heat generation with a simple structure. <P>SOLUTION: In the vacuum circuit breaker, a housing fixed conductor 20 in which a movable side conductive shaft 13 and a fixed side conductive shaft 18 are arranged in nearly identical axial line is fixed to an upper end lid 2 by a bolt; and a shock absorbing weight 21 which is arranged on nearly identical axial line as the amovable side conductive shaft 13 and the fixed side conductive shaft 18 and moves in the operation direction of a movable electrode 12 and a shock absorbing elastic body 22 interposed between the shock absorbing weight 21 and the upper end lid 2, and a return spring 23 which holds the shock absorbing weight 21 at a regular position on a connecting end face 19 side are housed in a housing space formed in the housing fixed conductor 20. While the housing fixed conductor 20 does not cause a positive slide and movement that make electric connection unstable, even if a shock is received in closing the circuit, the shock absorbing weight 21 makes repulsive movement to the upper end lid 2 side, and absorbs and attenuates the shock energy in closing the circuit as a kinetic energy. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vacuum circuit breaker having fixed and movable electrodes in butt contact.

  The vacuum circuit breaker is configured to open the gap between the fixed electrode and the movable electrode in a vacuum container that keeps the vacuum state, and cuts off the current. The fixed electrode and the movable electrode are in butt contact. It is known that chattering sometimes occurs when the movable electrode repeats rebounding. If this chattering is large, the electrode is consumed and damaged, so it is necessary to suppress chattering as much as possible.

  In the conventional vacuum circuit breaker, in order to prevent the chattering described above, an intermediate conductor that can move by receiving the impact force at the time of closing from the movable electrode side to the rear part of the fixed side conductive shaft to which the fixed electrode is joined, and A return spring that urges the intermediate conductor toward the fixed conductive shaft side is disposed, and the intermediate conductor is moved against the return spring in response to the impact force transmitted from the movable electrode at the time of closing. A device that absorbs collision energy that causes a rebounding operation at the time of closing is known (see, for example, Patent Document 1).

JP 2005-339934 A

  However, in the conventional vacuum circuit breaker, the intermediate conductor that moves by receiving the impact force transmitted from the movable electrode at the time of closing also forms a current-carrying portion that electrically connects the fixed electrode and one terminal. For this reason, a sliding contact structure is required for maintaining an electrical connection even when the intermediate conductor is moved. Therefore, this intermediate conductor must satisfy the function of moving when receiving an impact force from the movable electrode at the time of closing and the function of maintaining an electrical sliding contact state during this movement. The structure becomes complicated and the heat generation in the same part becomes large.

  An object of the present invention is to provide a vacuum circuit breaker having a simple structure and capable of suppressing chattering while suppressing heat generation.

  In order to achieve the above object, the present invention provides a vacuum vessel that is joined to a fixed electrode joined to a fixed-side conductive shaft, a movable conductive shaft arranged on substantially the same axis as the fixed-side conductive shaft, and the vacuum vessel. A movable electrode that is openable and closable while maintaining a degree of vacuum inside, and is arranged so as to electrically connect the fixed electrode and the fixed side conductive shaft to a terminal on one side, and the movable electrode and the movable side In a vacuum circuit breaker in which the conductive shaft is electrically connected to the other side terminal, the conductive shaft is located on the opposite side of the fixed side conductive shaft and electrically connected between the fixed side conductive shaft and the one side terminal. And a storage fixed conductor for receiving an impact transmitted from the movable electrode to the storage fixed conductor through the fixed electrode and the fixed-side conductive shaft when the circuit is closed. Support fixed And a shock absorbing weight that is provided on the opposite side of the fixed conductive shaft of the storage fixed conductor and absorbs the shock received by the storage fixed conductor as kinetic energy due to repulsive movement. Features.

  According to a second aspect of the present invention, in the vacuum circuit breaker according to the first aspect of the present invention, an impact-absorbing elastic body that acts to suppress repulsive movement of the shock-absorbing weight due to the impact is provided. It is characterized by.

  According to the vacuum circuit breaker according to the present invention, an impact is transmitted from the movable electrode to the fixed electrode and the fixed conductive shaft side at the time of closing. The impact energy at this time is absorbed or attenuated as the kinetic energy of the shock absorbing weight. Therefore, chattering in which the movable electrode bounces back and forth is suppressed. In addition, the storage fixed conductor that forms the energization path that electrically connects the fixed-side conductive shaft and the one-side terminal has a structure in which the position is fixed by the support fixing means without being actively moved. When configured to move the storage fixed conductor as in the prior art, a complicated sliding contact structure is required to maintain the electrical connection relationship, whereas the structure becomes complicated. The fixed conductor for storage that does not form a sliding contact part can keep the electrical connection between the fixed-side conductive shaft and the terminal on the one side in good condition at all times. Can be easy.

  According to the vacuum circuit breaker of the present invention as set forth in claim 2, in order to absorb or attenuate the impact energy at the time of closing as kinetic energy, the shock absorbing weight and the shock absorbing elastic body are housed fixed conductors. Since it can be easily housed and arranged in a housing space formed on the opposite side of the fixed-side conductive shaft, the apparent configuration can be simplified. In addition, the kinetic energy consumed by the movement of the shock absorbing weight can be easily adjusted by the mass of the shock absorbing weight, the elastic force of the shock absorbing elastic body, etc., regardless of the electrical energization section.

FIG. 1 is a longitudinal sectional view showing an open state of an insulator vacuum circuit breaker according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part at the time of closing in the insulator type vacuum circuit breaker shown in FIG.

FIG. 1 is a longitudinal sectional view of an insulator-type vacuum circuit breaker according to an embodiment of the present invention.
The upper and lower ends of the soot tube 1 are hermetically sealed by the upper end lid 2 and the lower end lid 3 to form a hermetic container. An insulating medium is enclosed in the hermetic container and the vacuum valve 4 is accommodated. An upper terminal 5 is attached to the upper end lid 2, and a lower terminal 6 is attached to the lower end lid 3. The soot tube 1 containing the vacuum valve is fixed on the supporting soot tube 7 established on the attached surface and is electrically insulated from the ground, and the vacuum valve is opened and closed by an operating device (not shown) arranged on the ground side. It is configured.

  The vacuum valve hermetically seals both ends of the insulating cylinder 8 with an upper end lid 9 and a lower end lid 10, and forms a vacuum container whose interior is kept in a vacuum using a bellows (not shown), and is fixed in the vacuum container. An electrode 11 and a movable electrode 12 are disposed. The movable electrode 12 is fixed to the movable conductive shaft 13, one end of the bellows described above is airtightly connected to the movable conductive shaft 13, and the other end of the bellows is airtightly connected to the lower end lid 10, and the bellows The movable side conductive shaft 13 is driven in the axial direction while maintaining the vacuum state of the inside, and the movable electrode 12 is opened and closed.

  Further, an insulating operation rod 15 is connected to the movable conductive shaft 13 at a position led out of the vacuum vessel through a pressure contact spring 14. The lower end side of the insulating operating rod 15 is connected to an operating device (not shown). When the operating rod 15 is driven downward by the operating device, the movable electrode 12 is opened downward via the movable conductive shaft 13. Can be driven in the direction. On the other hand, when the insulating operating rod 15 is driven upward in the figure by the operating device, the movable electrode 12 can be driven in the upper closing direction via the movable conductive shaft 13.

  The movable side conductive shaft 13 and the insulating operation rod 15 are connected with some play in the axial direction, and the pressure contact spring 14 is arranged by using this connection having play. That is, when the insulating operating rod 15 is driven to a predetermined closing position by the operating device and the movable electrode 12 comes into contact with the fixed electrode 11, the pressure contact spring 14 is urged to the movable electrode 12 via the movable conductive shaft 13. It acts so as to push up the movable electrode 12 and apply a contact pressure to the fixed electrode 11. Further, a current collector 16 is always in contact with the movable conductive shaft 13 at a position led out of the vacuum vessel, and the movable conductive shaft 13 and the lower portion are connected via the current collector 16, the cylindrical conductor 17, and the lower end lid 3. The side terminals 6 are electrically connected.

  On the other hand, the fixed electrode 11 is joined to a fixed-side conductive shaft 18 disposed substantially on the same axis as the movable-side conductive shaft 13. The fixed-side conductive shaft 18 is led out of the vacuum vessel while maintaining airtightness, and a connection end face 19 is formed at the lead-out end. The connecting end face 19 is coupled with a storage fixed conductor 20 arranged on the same axis as the movable conductive shaft 13 and the fixed conductive shaft 18 by bolts. The storage fixed conductor 20 is fixed to the lower surface side of the upper end lid 2 with bolts. A storage empty portion is formed in the storage fixed conductor 20, and the storage empty portion is disposed on substantially the same axis as the movable conductive shaft 13 and the fixed conductive shaft 18, and the movable electrode 12 An impact absorbing weight 21 movably movable in the direction of the operation axis, an impact absorbing elastic body 22 composed of rubber or a spring interposed between the impact absorbing weight 21 and the upper end cover 2, and an impact absorbing weight 21 are provided. A return spring 23 is housed which is held at a steady position on the connection end face 19 side.

  In this manner, the fixed electrode 11 and the upper terminal 5 are always electrically connected through the upper end lid 2 and the storage fixed conductor 20 integrated by a connection structure using bolts. In other words, there is no sliding portion or sliding contact portion in the electrical current-carrying portion existing between the fixed electrode 11 and the upper side terminal 5, and a stable electrical connection is established between the fixed electrode 11 and the upper side terminal 5 by the connection structure using bolts. Is connected and energized.

  As described above, in the vacuum valve, since both the electrodes 11 and 12 are in butt contact, chattering is likely to occur that the movable electrode 12 repeats rebound after the movable electrode 12 contacts the fixed electrode 11. Next, an operation for suppressing chattering will be described.

  In the vacuum circuit breaker having the above-described configuration, when the movable electrode 12 is driven upward and comes into contact with the fixed electrode 11, an impact is transmitted to the fixed electrode 11 from the movable electrode 12 side. 11 is transmitted to a fixed conductive shaft 18 disposed on the same axis as the movable conductive shaft 13. Further, since the storage fixed conductor 20 fixed to the upper end lid 2 is disposed on the same axis as the movable conductive shaft 13 described above, the impact is transmitted to the storage fixed conductor 20.

  Since the fixed conductor for storage 20 is supported and fixed to the upper end lid 2 by a bolt, even if it receives an impact, it does not actively slide and move so as to make the electrical connection unstable. However, the impact force transmitted to the storage fixed conductor 20 at this time is on the back side of the storage fixed conductor 20, that is, the upper end cover, on the same axis as the axes of the movable conductive shaft 13 and the fixed conductive shaft 18. As a result, the shock absorbing elastic body 22 and the return spring 23 hold the shock absorbing weight 21 on the fixed electrode 11 side in the housing fixed conductor 20 as shown in FIG. The shock absorbing weight 21 is repelled and moved to the upper end lid 2 side. At this time, the shock absorbing elastic body 22 acts so as to resist the movement of the shock absorbing weight 21. Thus, depending on the mass of the shock absorbing weight 21 and the spring coefficient of the shock absorbing elastic body 22, the impact energy at the time of closing is absorbed or attenuated as the kinetic energy of the shock absorbing weight 21. Thereafter, the shock absorbing weight 21 is held at a steady position by the return spring 23.

  According to such a vacuum circuit breaker, the impact energy transmitted from the movable electrode 12 to the fixed electrode 11 side at the time of closing is absorbed or attenuated as the kinetic energy of the shock absorbing weight 21, so that the movable electrode 12 rebounds. Chattering that repeats is suppressed. In addition, while the shock absorbing weight 21 moves repulsively, the storage fixed conductor 20 that forms a current-carrying path that electrically connects the fixed electrode 11 and the upper end lid 2 receives an impact during closing. Therefore, positive sliding does not occur in the electrical energization portion formed between the fixed electrode 11 and the upper terminal 5, and the electrical current in the energization portion does not move. The connection relationship can always be kept good.

  If it is attempted to absorb an impact at the time of closing by positive movement or sliding of the storage fixed conductor 20, the storage fixed conductor that forms an electrical current path even when the movement occurs. 20 requires a complicated sliding contact structure in order to maintain an electrical connection relationship, and the structure becomes complicated. However, as described above, it is the shock absorbing weight 21 that does not form an electrical conduction path that moves in order to absorb the shock at the time of closing, and the electrical connection between the fixed electrode 11 and the upper terminal 5 is performed. Since the storage fixed conductor 20 forming a part of the current conducting path does not move positively to absorb the impact, the electrical connection structure can be simplified.

  Further, according to the vacuum circuit breaker described above, the shock absorbing weight 21 and the shock absorbing elastic body 22 are arranged to absorb or attenuate the shock energy at the time of closing as kinetic energy. The absorbing weight 21 and the shock absorbing elastic body 22 can be easily housed and disposed in a housing space formed on the opposite side of the stationary conductor 20 to the stationary conductive shaft 18. Since the shock absorbing weight 21 and the shock absorbing elastic body 22 are concealed in the storage fixed conductor 20 in appearance, the apparent configuration can be simplified. Furthermore, the kinetic energy consumed by the movement of the shock absorbing weight 21 can be easily adjusted by the mass of the shock absorbing weight 21 or the elastic force of the shock absorbing elastic body 22.

  The above-described vacuum circuit breaker has been described as an insulator-type vacuum circuit breaker in which the vacuum valve 4 is housed in the soot tube 1 fixed at the upper position by the supporting soot tube 7. A tank-type vacuum circuit breaker configured by arranging valves may also be used. In this case, an insulating support having one end fixed in the sealed tank may be provided, and the storage fixed conductor 20 shown in FIG. 1 may be supported and fixed on the other end of the insulating support. In addition, a conductor corresponding to the upper end cover 2 is supported and fixed by an insulating support, and the storage fixed conductor 20 is fixed to the conductor with a bolt, or is manufactured integrally with a conductor corresponding to the upper end cover 2 by an insulating support. The stored stationary conductor 20 may be directly fixed.

  Regardless of which method is employed, when the present invention is implemented, the storage tube 1 shown in FIG. 1 or the like can be prevented from moving due to an impact when the movable electrode 12 is closed. It is necessary to provide support and fixing means by an insulating cylinder or an insulating support corresponding to the above, and to support and fix the storage fixed conductor 20 by this support and fixing means. The storage fixed conductor 20 supported and fixed in this manner by the support fixing means is used for shock absorption that absorbs or attenuates the shock at the time of closing by kinetic energy on the back surface side located on the axis of the fixed conductive shaft 18. By arranging the weight 21, substantially the same effect can be achieved.

  The vacuum circuit breaker according to the present invention is not limited to the structure shown in FIG. 1, but can be applied to vacuum circuit breakers having other structures.

DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Upper end cover 3 Lower end cover 4 Vacuum valve 5 Upper side terminal 6 Lower side terminal 7 Support side pipe 8 Insulation cylinder 9 Upper end cover 10 Lower end cover 11 Fixed electrode 12 Movable electrode 13 Movable side conductive shaft 14 Pressure contact spring 15 Insulating operation rod 16 Current collector 17 Cylindrical conductor 18 Fixed side conductive shaft 19 End face for connection 20 Fixed conductor for storage 21 Weight for shock absorption 22 Elastic body for shock absorption 23 Return spring

Claims (2)

  In a vacuum vessel, it can be opened and closed while being joined to a fixed electrode joined to a fixed-side conductive shaft and a movable conductive shaft arranged almost on the same axis as the fixed-side conductive shaft and maintaining the degree of vacuum in the vacuum vessel. The fixed electrode and the fixed conductive axis are electrically connected to one terminal, and the movable electrode and the movable conductive axis are electrically connected to the other terminal. In the connected vacuum circuit breaker, the housing fixed conductor is located on the side opposite to the fixed electrode of the fixed side conductive shaft and electrically connects the fixed side conductive shaft and the one side terminal to form an energization path; A support and fixing means for supporting and fixing the storage fixed conductor so as to receive an impact transmitted from the movable electrode to the storage fixed conductor through the fixed electrode and the fixed-side conductive shaft when the circuit is closed; Said fixed conductor for Provided on the opposite side of the Jogawa conductive shaft, the vacuum circuit breaker is characterized by providing an impact-absorbing weights for absorbing shocks the accommodating stationary conductor has received as kinetic energy by the rebound movement.   2. The vacuum circuit breaker according to claim 1, further comprising an impact-absorbing elastic body that acts to suppress repulsion movement of the shock-absorbing weight due to the impact.

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