JP4923770B2 - Circuit breaker and puffer type gas circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker and a puffer type gas circuit breaker, and more particularly to a contact opening drive structure capable of improving the recovery rate of dielectric strength.

  The conventional puffer-type gas circuit breaker is designed to extinguish arcs in the puffer chamber by driving the puffer cylinder integrally with the movable contact when the opening command is issued, and gradually reducing the volume of the puffer chamber. The gas was compressed by the piston. And by such a structure, by blowing the arc extinguishing gas compressed in the puffer chamber against the arc generated when the stationary contact and the movable contact are separated, the arc is cooled, The current interruption performance was improved. (For example, see Patent Document 1)

JP 60-212923 A

  In the puffer-type gas circuit breaker according to Patent Document 1, the driving force of the movable contactor and the puffer cylinder after the opening command and the compression reaction force of the puffer chamber depend only on the driving force of the driving device. Therefore, in order to ensure the breaking performance in a situation where high voltage and large current are required for the circuit breaker, the size of the puffer chamber is increased to increase the amount of gas sprayed, and the insulation recovery speed between the breaker poles Therefore, there is a problem in that the separation speed is required to be improved, and the size of the apparatus is increased due to the improvement of the performance of the drive device (up of the drive force).

  The present invention has been made to solve the above-described problems, and does not cause an increase in the size and cost of the apparatus, while ensuring a breaking performance and realizing a high voltage and a large current. And a puffer-type gas circuit breaker.

Circuit breaker according to the present invention, the fixed-side contact having a contact, to the stationary contactor, are detachably arranged, movable contact having a contact corresponding to the contact of the stationary contactor ,
Wherein the movable contact and the fixed contact has an engagement portion engaged with each other at the time of closing,
Opening operation lifting, pulling means for applying a tensile force the a stationary contactor in the opening direction opposite to the direction, when the opening operation is started from the closed state, the movable contact and the fixed-side contact both driven in the opening direction, at a desired position of the middle opening operation, with the engaging opening means for opening the engagement of the movable contactor and the stationary contactor, the engaging portion is, The fixed contact and the movable contact are constituted by protrusions or grooves provided at positions corresponding to each other, and the engagement releasing means is in sliding contact with the movable contact, and the movable contact As the opening driving distance increases with the guide member that guides the driving of the movable member, the movable-side contactor floats in a direction in which the engagement of the engaging portion is released by sliding contact with the guide member. , Formed on a part of the surface of the movable contact that is in sliding contact with the guide member By having a tapered portion, and is characterized in that the engagement of the engaging portion by the driving force applied to the movable contactor is configured to be opened.
The puffer-type gas circuit breaker according to the present invention has a contact corresponding to the contact of the stationary contact, the stationary contact having a contact, the stationary contact being arranged so as to be able to contact and separate, When opening drive is started from the closed state, the movable contact that is driven in the opening direction together with the fixed contact, and the arc extinguishing property that is driven integrally with the movable contact at the time of opening drive A movable side puffer chamber having a gas outlet, a movable side piston slidably supported in the movable side puffer chamber, and the fixed side contactor in the movable side contactor from the outlet of the movable side puffer chamber; An insulating nozzle that extends to the contact point of the arc and forms a flow path for the arc extinguishing gas, an engaging portion that engages the fixed side contactor and the movable side contactor when closed, and opens from the closed state When pole driving is started, the stationary contact is opened in the direction opposite to the opening direction. Tensioning means for applying a tensile force that increases as the driving distance increases, and during the opening drive, the engagement of the engaging portion is released by the driving force applied to the movable contactor and the tensile force of the tensioning means. The engagement release means comprises a protrusion or a groove provided at a position corresponding to each other in the fixed contact and the movable contact, and the engagement release means includes the engagement release means, The engagement of the engaging portion is released by sliding contact with the guide member and the guide member that slides on the movable contact and guides driving of the movable contact, and the opening driving distance increases. A driving force applied to the movable contact, having a tapered portion formed on a part of the surface of the movable contact that is in sliding contact with the guide member so that the movable contact is lifted in a direction The engagement portion is released by It is characterized in that it is configured to be.
In addition, the fixed side contact having a contact and the fixed side contact are arranged so as to be able to come in contact with and away from each other. The movable side contactor driven in the opening direction together with the fixed side contactor, and the movable side having an arc-extinguishing gas outlet that is driven integrally with the movable side contactor during opening opening. A puffer chamber, a movable side piston slidably supported in the movable side puffer chamber, and extending from a jet port of the movable side puffer chamber to a contact point of the movable side contactor with the fixed side contactor. Insulating nozzle that forms a flow path of arc gas, when closing, an engaging portion that engages the stationary contact and the movable contact with each other, and when opening driving is started from a closed state, Increases as the driving distance increases in the direction opposite to the opening direction of the stationary contact. A tensioning means for applying a tensile force, a driving force for applying the engagement of the engaging portion to the movable contact during the opening drive, and an engagement releasing means for releasing by the tensile force of the tensioning means; A fixed-side puffer chamber formed with a fixed-side contactor as one surface, one end joined to the pulling means, and a fixed-side piston supported slidably in the fixed-side puffer chamber, the fixed-side puffer chamber A first check valve for sucking gas into the fixed puffer chamber and the first check valve in the fixed puffer chamber are formed on the surface formed by the fixed side contactor. A second check valve is provided on a surface other than the surface for blowing gas out of the fixed puffer chamber.

According to the circuit breaker and the puffer type gas circuit breaker according to the present invention, the recovery speed of the dielectric strength can be improved.

Embodiment 1 FIG.
Fig.1 (a) is sectional drawing which shows the closing state of the interruption | blocking site | part of the puffer type gas circuit breaker in Embodiment 1 for implementing this invention. In FIG. 1A, reference numeral 1 denotes a fixed side terminal, which is supported by the fixed side support 1 a while being insulated from the tank 50. Reference numeral 2 denotes a movable-side terminal, which is supported by the movable-side support base 2a while being insulated from the tank 50. Reference numeral 3 denotes a fixed-side contact formed in a cylindrical shape in conduction with the fixed-side terminal 1 via the fixed-side guide 5. The stationary contact 3 is supported by a support plate 4 of a stationary contact formed in a disk shape. The support plate 4 is engaged and supported so as to be slidable in a drive shaft direction of a puffer-type gas circuit breaker (hereinafter referred to as a circuit breaker) with respect to a fixed guide 5 formed in a cylindrical shape.

  Reference numeral 6 denotes tension means interposed between the fixed terminal 1 and the support plate 4. In the first embodiment, the tension means is designed to be longer than the natural length by a predetermined length in the closed state of the circuit breaker. The coil spring expands and contracts in the direction of the drive axis of the circuit breaker. That is, a rib-like stopper 5a is continuously provided over the entire inner surface of the fixed side guide 5, and when the support plate 4 is in contact with the stopper 5a, the coil spring 6 has a predetermined length from the natural length. Since the length is longer, a predetermined urging force is applied to the support plate 4.

  The tension means 6 is not limited to a coil spring, and may be, for example, a disc spring, a rubber member, or a drive device (hydraulic type or the like). Moreover, the stopper 5a is not limited to a configuration in which the stopper 5a is continuously provided over the entire circumference on the inner surface side of the fixed side guide 5, and may be a configuration in which, for example, four locations are provided at 90 ° intervals. That is, the stopper 5a only needs to have a stopping function when the support plate 4 is pulled back by the coil spring 6.

  Reference numeral 7 denotes a movable contact formed in a cylindrical shape. A movable puffer cylinder 8 is formed in a cylindrical shape so as to cover the outer peripheral surface of the movable contact 7 and supports the movable contact 7. Therefore, when an opening or closing command is issued, the movable contact 12 and the movable puffer cylinder 8 are integrally driven in the direction of the drive shaft of the circuit breaker by the movable rod 12. 2b is a movable main contact formed in a cylindrical shape, and the movable contact 7 is in conduction with the movable terminal 2 via the movable puffer cylinder 8 and the movable main contact 2b. The movable rod 12 drives the movable contact 7 in the opening direction and the closing direction by a hydraulic pump mechanism.

  The movable puffer cylinder 8 forms a movable puffer chamber 9 together with the movable contact 7 and the movable piston 10. The movable piston 10 is formed in a cylindrical shape so as to cover the outer peripheral surface of the movable contact 7 and is supported by the movable contact 7 and the movable puffer chamber 9 so as to be slidable in the drive shaft direction of the circuit breaker. Has been. The movable puffer chamber 9 is filled with an arc extinguishing gas. 11 is formed in a cylindrical shape so as to cover the outer peripheral surface of the movable contact 7, and extends from the vicinity of the arc-extinguishing gas outlet 9 a provided in the movable puffer chamber 9 to the vicinity of the tip of the movable contact 7. This is an insulating nozzle for forming the arc extinguishing gas flow path 13.

  In addition, the jet nozzle 9a is provided in multiple places on the outer periphery of the movable contact 7, and the portion where the jet 9a is not provided is joined to the movable contact 7, and is movable with the fixed terminal 1 in the closed state. A part of the conduction path between the side terminals 2 is formed. That is, in the closed state, the fixed terminal 1 and the movable terminal 2 are connected via the coil spring 6, the support plate 4, the fixed contact 3, the movable contact 7, the movable puffer cylinder 8, and the movable main contact 2b. It is in a conductive state. The flow path 13 is formed over the entire outer periphery of the movable contact 7. In the first embodiment, the connection between the fixed terminal 1 and the support plate 4 is performed via the coil spring 6, but the present invention is not limited to this. For example, a configuration in which electrical connection is made via an elastic conductive member may be used.

  The stationary contact 3 has a protrusion 3a at the tip, and similarly the movable contact 7 has a protrusion 7a at the tip. FIG. 1B is an enlarged view of the protrusion 3a. FIG. 1C is an enlarged view of the protrusion 7a. As shown in FIG. 1A, in the closed state, the protrusion 3a and the protrusion 7a are engaged with each other and become conductive. At this time, since the fixed contact 3 is given a predetermined biasing force by the coil spring 6 via the support plate 4, the protrusion 3a and the protrusion 7a are engaged with each other with a predetermined contact pressure. .

  Hereinafter, the shape of the protrusion 3a and the protrusion 7a will be described with reference to FIGS. 1B and 1C. As shown in FIG. 1B, the protrusion 3a is formed in a curved surface, and the gradient of the inclined surface 31 on the side where the protrusion 7a of the movable contact 7 is engaged during the closing operation is as follows. Designed to be small and devised to suppress frictional resistance during engagement. On the other hand, during the opening operation, the gradient of the inclined surface 32 on the side where the protrusion 7a of the movable contact 7 is separated is designed to be larger than the gradient of the inclined surface 31 on the side where the protrusion 7a is engaged. Thus, the protrusion 3a and the protrusion 7a are devised so as to have a function as an invitation part at the time of separation while ensuring a desired engagement force.

  As shown in FIG. 1C, the protrusion 7a is also formed in a curved surface, and the gradient of the inclined surface 71 on the side that engages with the protrusion 3a of the stationary contact 3 during the closing operation is as follows. Designed to be small and devised to suppress frictional resistance during engagement. On the other hand, during the opening operation, the slope of the inclined surface 72 that is separated from the protrusion 3a of the fixed contact 3 is designed to be larger than the gradient of the inclined surface 71 that is engaged with the protrusion 3a. The protrusion 3a and the protrusion 7a are devised so as to have a function as an invitation part at the time of separation while ensuring a desired engagement force.

  The surface shapes of the protrusion 3a and the protrusion 7a are not limited to the shapes shown in the first embodiment described above. For example, in the protrusion 3a, the gradient of the inclined surface 31 on the side where the protrusion 7a is engaged may be the same as the gradient of the inclined surface 32 on the side where the protrusion 7a is separated. The same applies to the protrusion 7a. Further, the protrusion 3a and the protrusion 7a suppress the frictional resistance when the protrusion 7a is engaged with the protrusion 3a during the closing operation, and the protrusion 3a and the protrusion 7a during the opening operation ensure a desired engagement force. However, it suffices to have a surface having a function as an invitation part at the time of separation.

  As described above, the fixed-side contact 3 and the movable-side contact 7 are engaged with each other by the engaging portion formed of the protrusions 3a and 7a so that they can be separated from each other. 32 and 72, the movable rod 12 has a function as an engagement release means for releasing the engagement of the engagement portion during the opening operation. In the first embodiment, as a part of the engagement portion and the engagement release means, the protrusion 3a and the protrusion 7a provided at the distal ends of the fixed contact 3 and the movable contact 7, respectively, are used. However, it is not limited to this. For example, a protrusion may be formed on one of the fixed contact 3 and the movable contact 7 and a groove may be formed on the other. Further, the inclined surface as the invitation portion may be provided only on one of the protrusions (or groove portions) provided at the distal ends of the fixed contact 3 and the movable contact 7.

  However, as shown in the first embodiment, the configuration in which the guiding portion is provided at both the protruding portion (or the groove portion) provided at the tip of the fixed side contact 3 and the movable side contact 7 has a fixed side. Since the effect of reducing the driving force required for contact and separation between the contact 3 and the movable contact 7 is increased, the effect that it is not necessary to increase the size of the movable rod 12 is also increased.

  FIG. 2 is a cross-sectional view showing a main part in a state immediately before the breaking part of the circuit breaker according to the first embodiment for carrying out the present invention is opened. FIG. 3 is a cross-sectional view showing a main part in a state where an arc is generated immediately after the breaking part of the circuit breaker in Embodiment 1 for carrying out the present invention is opened. 2 and 3 show only the upper part with respect to the central axis P of the circuit breaker.

  Hereinafter, operation | movement of the circuit breaker in this Embodiment 1 is demonstrated using FIGS. 1-3. First, the conduction path in the closed state shown in FIG. In the closed state, the fixed side terminal 1 and the movable side terminal 2 are in a conductive state. That is, in a state where the protrusion 3a of the fixed contact 3 and the protrusion 7a of the movable contact 7 are engaged, the protrusion 3a and the protrusion 7a are in contact with each other and constitute a part of the conduction path. Therefore, the fixed side terminal 1 and the movable side terminal 2 are brought into conduction through the coil spring 6, the support plate 4, the fixed side contactor 3, the movable side contactor 7, the movable puffer cylinder 8, and the movable side main contactor 2b. is there. Further, since the coil spring 6 is designed to be longer than the natural length by a predetermined length in the closed state, the protrusion 3a and the protrusion 7a are engaged with each other with a predetermined contact pressure, and contact reliability is ensured. Is secured.

  Next, when an opening command is issued in the closed state shown in FIG. 1A, the movable contact 7 is driven in the direction of arrow A by the movable rod 12. At this time, since the protrusion 7 a of the movable contact 7 and the protrusion 3 a of the fixed contact 3 are engaged, the fixed contact 3 is pulled by the movable contact 7 and is the same as the movable contact 7. To the direction of arrow A. That is, both the movable contact 7 and the fixed contact 3 are driven in the direction of the arrow A shown in FIG. 1A while resisting the tensile force of the coil spring 6.

  At this time, since the movable puffer cylinder 8 is driven integrally with the movable contactor 7 in the direction of the arrow A, the volume of the movable puffer chamber 9 is gradually reduced by the movable piston 10 and the arc extinguishing gas is compressed. Is done. In the first embodiment, the gap between the tip portion 11a of the insulating nozzle 11 and the stationary contact 3 is the minimum at which contact between the tip 11a and the stationary contact 3 does not occur during opening and closing operations. Is set to a gap. Therefore, the arc extinguishing gas filled in the movable-side puffer chamber 9 is ejected from the ejection port 9a due to the resistance in the gap, and the flow rate flowing through the flow path 13 is suppressed.

  As both the movable contact 7 and the fixed contact 3 are driven in the direction of the arrow A, the coil spring 6 expands and the tensile force, that is, the spring reaction force increases, so the inclined surface 32 of the protrusion 3a. As shown in FIG. 2, the inclined surface 72 of the protrusion 7a begins to produce a relative displacement, and the protrusion 7a floats while the movable contact 7 is bent. The movable contact 7 is formed in a cylindrical shape, but a slit (not shown) is provided on the side that engages with the fixed contact 3. Thereby, it becomes possible to give elasticity to the engaging part with the fixed side contact 3 in the movable side contact 7, and it is devised so that it may bend easily. The slit (not shown) is a cut that forms a minimum gap, and suppresses leakage of the arc extinguishing gas filled in the movable side puffer chamber 9.

  After the protrusion 7a floats while the movable contactor 7 is bent, and further driven in the direction of arrow A, the protrusion 7a gets over the protrusion 3a, and the engagement between the protrusion 3a and the protrusion 7a is released as shown in FIG. Is done. That is, when the tensile force of the coil spring 6, that is, the combined force of the spring reaction force and the engaging force of the protrusion 3a and the protrusion 7a exceeds the driving force of the movable rod 12, the engagement of the protrusion 3a and the protrusion 7a is released. .

  At the moment when the stationary contact 3 and the movable contact 7 are separated, the current between the poles is ignited between the stationary contact 3 and the movable contact 7 and an arc 14 is generated. At this time, as shown in FIG. 3, immediately after the breaker is opened, the lower side of the tip 11a of the insulating nozzle 11 is opened, so that the movable side puffer chamber compressed by the movable side piston 10 and having a high pressure is used. The arc extinguishing gas in 9 flows through the flow path 13 from the jet outlet 9a at a desired flow velocity, and is blown to the arc 14 to cool the arc 14. Further, at the moment when the stationary contact 3 and the movable contact 7 are separated, the stationary contact 3 is pulled back in the direction opposite to the arrow A by the coil spring 6, and the position shown in FIG. The plate 4 returns to the position where it abuts against the stopper 5a.

  In the first embodiment, when the engagement between the protrusion 3a and the protrusion 7a is released, the movable contact 7 is bent, and the protrusion 7a is floated in a direction in which the engagement with the protrusion 3a is released. However, the present invention is not limited to this, and by providing a slit in the fixed contact 3, the fixed contact 3 may be bent and the protrusion 3 a may be sunk in a direction in which the engagement with the protrusion 7 a is released. Alternatively, a composite structure in which slits are provided in both the movable contact 7 and the fixed contact 3 and both are bent may be employed.

  In the first embodiment, when the tensile force of the coil spring 6, that is, the combined force of the spring reaction force and the engaging force of the protrusion 3a and the protrusion 7a exceeds the driving force of the movable rod 12, the protrusion 3a and the protrusion Although the engagement of 7a is configured to be released, the present invention is not limited to this. For example, in addition to the engagement force between the protrusion 3a and the protrusion 7a, there is also provided a mechanical engagement means for applying an engagement force separately. The tensile force of the coil spring 6, the engagement force between the protrusion 3a and the protrusion 7a, and the mechanical relationship. The engagement of the protrusion 3a and the protrusion 7a may be released when the total force of the engagement force by the combination means exceeds the driving force of the movable rod 12. Further, a configuration may be provided that additionally includes mechanical engagement release means for releasing the engagement between the protrusion 3a and the protrusion 7a when the difference between the tensile force of the coil spring 6 and the driving force of the movable rod 12 reaches a predetermined value. .

  With the configuration and operation described above, the arc 14 generated at the moment when the stationary contact 3 and the movable contact 7 are separated is cooled by the arc extinguishing gas. At the same time, the stationary contact 3 is pulled back in the direction opposite to the arrow A by the coil spring 6. Therefore, the separation speed of the stationary contact 3 and the movable contact 7 immediately after the separation, that is, the breaking speed of the circuit breaker is not only the driving force of the movable rod 12 but also the tensile force of the coil spring 6, that is, Because the spring reaction force is also used, it increases. As a result, the recovery rate of the dielectric strength can be improved, and as a result, the breaking performance can be ensured without increasing the size of the movable-side puffer chamber 9 and the movable rod 12, and high voltage and large current can be realized.

  In the first embodiment, the fixed-side contactor is designed by designing the spring constant of the coil spring 6 and the shapes of the protrusion 3a and the protrusion 7a according to the size of the movable-side puffer chamber 9 and the driving force of the movable rod 12. 3 and the open position of the movable contact 7 can be set optimally.

  In the first embodiment, the puffer type gas circuit breaker is used. However, the present invention is not limited to this. For example, in a relatively small voltage and small current circuit breaker, the movable side puffer chamber 9, the jet nozzle 9a, Even if no components such as the movable side piston 10 and the insulating nozzle 11 are provided, the stationary side contact 3 is pulled back in the direction opposite to the arrow A by the coil spring 6, so that the stationary side contact 3 and the movable side contact immediately after the opening are separated. The breaking speed of the child 7 can be increased, and the dielectric strength can be secured.

Embodiment 2. FIG.
Fig.4 (a) is sectional drawing which shows the principal part of the closing state of the interruption | blocking part of the circuit breaker in Embodiment 2 for implementing this invention. FIG. 4B is an enlarged view of the protrusion 3c shown in FIG. FIG. 4C is an enlarged view of the protrusion 7c shown in FIG. FIG. 5 is a cross-sectional view showing a main part in a state immediately before the breaking of the breaking part of the circuit breaker in the second embodiment for carrying out the present invention. FIG. 6 is a cross-sectional view showing a main part in a state where an arc is generated immediately after the breaker of the breaker in Embodiment 2 for carrying out the present invention is opened. 4 to 6 show only the upper part with respect to the central axis P of the circuit breaker. 4 to 6, the same components as those in FIGS. 1 to 3 in the first embodiment are denoted by the same reference numerals, and description of the configuration and functions is omitted.

  First, the same or different points of the protrusion 3c and the protrusion 7c in the second embodiment from the protrusion 3a and the protrusion 7a in the first embodiment will be described. The protrusion 3c and the protrusion 7c have a function as an engaging portion between the fixed side contactor 3 and the movable side contactor 7 as in the case of the protrusion 3a and the protrusion 7a in the first embodiment, but are different in shape. Hereinafter, the shape of the protrusion 3c and the protrusion 7c will be described with reference to FIGS. 4B and 4C. As shown in FIG. 4B, the protrusion 3c is formed in a substantially curved surface, and the gradient of the inclined surface 33 on the side to which the protrusion 7c of the movable contact 7 is engaged during the closing operation. Is designed to be small and devised to suppress frictional resistance during engagement. On the other hand, during the opening operation, the slope of the inclined surface 34 on the side where the protrusion 7c of the movable contact 7 is separated is designed to be reverse, and the protrusion 3c and the protrusion 7c are the same as those in the first embodiment. It is devised to ensure a larger engagement force than the protrusion 3a and the protrusion 7a.

  As shown in FIG. 4C, the protrusion 7c is formed in a curved surface, and the gradient of the inclined surface 73 on the side that engages with the protrusion 3c of the stationary contact 3 during the closing operation is as follows. Designed to be small and devised to suppress frictional resistance during engagement. On the other hand, during the opening operation, the gradient of the inclined surface 74 that is separated from the protrusion 3c of the stationary contact 3 is designed to be larger than the gradient of the inclined surface 73 that is engaged with the protrusion 3c. The protrusion 3c and the protrusion 7c are devised so as to have a function as an invitation part at the time of separation while ensuring a desired engagement force.

  Reference numeral 15 denotes a guide member formed in a cylindrical shape for guiding the driving of the movable contact 7. The movable contact 7 has a tapered portion 7 b formed in a tapered shape on a surface that is in sliding contact with the guide member 15. The taper portion 7b is inclined in the direction of the central axis P from a desired position of the movable contactor 7 toward a position where the protrusion 7c is provided. In the second embodiment, a bearing (not shown) is interposed between the guide member 15 and the taper portion 7b to reduce the frictional resistance of the sliding contact surface during the opening and closing operations. ing. Needless to say, this is true even without bearings.

  When the opening command is issued in the closed state shown in FIG. 4, the movable contact 7 and the fixed contact 3 are moved in the direction of arrow A by the movable rod (not shown) as in the first embodiment. Driven by. At this time, since the surface having the taper portion 7b of the movable contact 7 is slid with respect to the guide member 15, the movable contact 7 is moved by the taper portion 7b in sliding contact with the guide member 15 as it is driven. The protrusion 7c and the protrusion 3c are bent in a direction to release the engagement. As in the first embodiment, the movable contact 7 is formed in a cylindrical shape, but a slit (not shown) is provided on the side that engages with the fixed contact 3. Thereby, it becomes possible to give elasticity to the engaging part with the fixed side contact 3 in the movable side contact 7, and it is devised so that it may bend easily. That is, the taper portion 7b and the movable rod 12 function as an engagement release means for releasing the engagement of the engagement portion composed of the protrusion 3c and the protrusion 7c.

  Reference numeral 16 denotes a fixed-side puffer chamber formed in a cylindrical shape so as to cover the outer peripheral surface of the fixed-side contact 3. The fixed-side contact 3 forms an inner ring side surface, and the other side is a fixed puffer cylinder 17. The fixed piston 18 is used. The fixed-side puffer chamber 16 has an arc-extinguishing gas suction port 16a on the surface formed by the fixed-side contact 3, and an arc-extinguishing gas blowing port 16b on the opposite surface. The first check valve 19a and the outlet 16b that form a flow path only in the direction from the outside to the inside of the fixed-side puffer chamber 16 have a flow path only in the direction from the inside to the outside of the fixed-side puffer chamber 16. A second check valve 19b to be formed is provided. The fixed piston 18 supports the fixed contact 3 and a coil spring 6 is interposed between the fixed piston 18 and the fixed terminal 1. The fixed piston 18 is supported by the fixed puffer cylinder 17 so as to be slidable in the drive shaft direction of the circuit breaker.

  In the second embodiment, as shown in the closed state shown in FIG. 4A, the fixed side terminal (not shown) and the movable side terminal (not shown) are fixed puffer cylinder 17, fixed side piston 18, It is in a conductive state via the stationary contact 3, the movable contact 7, the movable puffer cylinder 8, and the movable main contact (not shown).

  As in the first embodiment, in the closed state, the coil spring 6 is designed to be longer than the natural length by a predetermined length, so that the protrusion 3c and the protrusion 7c have a predetermined contact pressure. It is engaged in the state and contact reliability is ensured. Therefore, the stationary contact 3 and the movable contact 7 are electrically connected to each other with a predetermined contact pressure due to the engagement between the protrusion 3c and the protrusion 7c.

Hereinafter, the operation of the circuit breaker according to the second embodiment will be described with reference to FIGS.
When the opening command is issued in the closed state shown in FIG. 4A, the movable contact 7 is moved to the protrusion 3c and the protrusion 7c by the movable rod (not shown) as in the first embodiment. The fixed side contactor 3 engaged with the coil spring 6 is driven in the direction of the arrow A shown in FIG.

  At this time, since the movable puffer cylinder 8 is also driven in the direction of the arrow A together with the movable contactor 7, the volume of the movable puffer chamber 9 is gradually reduced by the movable piston 10, and the arc extinguishing gas is compressed. Is done. Similarly, the volume of the fixed-side puffer chamber 16 is gradually reduced by the fixed-side piston 18 that is driven integrally with the fixed-side contact 3 in the direction of arrow A. At this time, since the gas in the fixed puffer chamber 16 is blown out from the second check valve 19b, the internal pressure of the fixed puffer chamber 16 does not increase, and the driving force of the movable rod (not shown) is hindered. Nor.

  As both the movable contact 7 and the fixed contact 3 are driven in the direction of the arrow A, the coil spring 6 expands and the tensile force, that is, the spring reaction force increases. Therefore, as shown in FIG. The sliding contact between the member 15 and the tapered portion 7b causes the movable contact 7 to bend in a direction in which the engagement between the protrusion 7c and the protrusion 3c is released. That is, the protrusion 7c floats in the direction in which the engagement between the protrusions 3c and 7c is released. Thereafter, as shown in FIG. 6, the protrusions 3c and 7c are opened at a desired position during the opening operation. At the moment when the stationary contact 3 and the movable contact 7 are separated, the current flowing between the electrodes is ignited between the stationary contact 3 and the movable contact 7 and an arc 14 is generated. To do.

  As shown in FIG. 6, since the lower side of the tip 11a of the insulating nozzle 11 is opened at the moment when the stationary contact 3 and the movable contact 7 are separated, they are compressed by the movable piston 10 and are pressurized. The arc extinguishing gas in the movable puffer chamber 9 that has been obtained obtains a desired flow velocity, flows through the flow path 13 from the ejection port 9a, is blown to the arc 14, and cools the arc 14. Further, at the moment when the stationary contact 3 and the movable contact 7 are separated, the stationary contact 3 is pulled back in the direction opposite to the arrow A by the coil spring 6, and the position shown in FIG. The plate 4 returns to the position where it abuts against the stopper 17a. The stopper 17a has the same function, shape, etc. as the stoper 5a in the first embodiment.

  Further, at the moment when the stationary contact 3 and the movable contact 7 are separated, the stationary contact 3 is instantaneously pulled back by the coil spring 6, so that the inside of the stationary puffer chamber 16 becomes negative pressure. As shown in FIG. 6, the arc-extinguishing gas that is blown to 14 and absorbs the heat of the arc 14 to become a high temperature passes between the fixed contacts 3 formed in a cylindrical shape, as shown by an arrow B, The first check valve 19 a is sucked into the fixed side puffer chamber 16.

  With the configuration and operation described above, in addition to the effects shown in the first embodiment, the arc-extinguishing gas that has absorbed the heat of the arc 14 and has reached a high temperature is sucked into the fixed-side puffer chamber 16 to increase the temperature. Since the arc extinguishing gas can be prevented from staying between the electrodes, the time until the arc 14 is extinguished can be shortened. Therefore, the recovery rate of the dielectric strength can be improved. Further, since the protrusion 7c is lifted by sliding between the guide member 15 and the tapered portion 7b, the wear of the protrusion 3c and the protrusion 7c is suppressed as compared with the first embodiment, and the reliability of the circuit breaker is improved. To do.

  Furthermore, in the second embodiment, the spring constant of the coil spring 6, the shape of the protrusion 3c and the protrusion 7c, and the shape of the taper portion 7b are designed according to the size of the movable-side puffer chamber 9 and the driving force of the movable rod 12. Thus, the separation position between the stationary contact 3 and the movable contact 7 can be set optimally. In particular, as compared with the first embodiment, since a part of the engagement release means is configured by the tapered portion 7b, the engagement force between the protrusion 3c and the protrusion 7c can be increased, and reliability at the time of closing the pole is achieved. Improves. Further, the fixed side contactor 3 and the movable side contactor 7 are separated from each other by the hooking allowance of the projections 3c and the projections 7c and the taper portion shape (gradient height) without depending on the surface shapes of the projections 3c and 7c. The position can be set, and the design can be simplified.

Embodiment 3 FIG.
FIG. 7 is a cross-sectional view showing a main part in a closed state of the breaker of the circuit breaker according to Embodiment 3 for carrying out the present invention. FIG. 7 shows only the upper part with respect to the central axis P of the circuit breaker. 7, the same components as those in FIGS. 1 to 3 showing the first embodiment and FIGS. 4 to 6 showing the second embodiment are denoted by the same reference numerals, and the description of the configuration and functions is omitted. To do. The difference from the second embodiment is that the installation position of the coil spring 6 is different.

  That is, in the first embodiment, the coil spring 6 is interposed between the fixed terminal 1 and the fixed piston 18. Therefore, the coil spring 6 functions as a tension spring. On the other hand, in the first embodiment, the coil spring 6 is interposed between the fixed puffer cylinder 17 and the fixed side piston 18. Therefore, the coil spring 6 functions as a compression spring. In the third embodiment, similarly to the first and second embodiments, the coil spring 6 is designed to be longer than the natural length by a predetermined amount in the closed state. Therefore, as described above, since the protrusion 3c and the protrusion 7c are engaged with each other with a predetermined contact pressure, contact reliability is ensured. In the third embodiment, a guide portion (not shown) is provided for preventing the coil spring as the coil spring 6 from buckling during the process of compressing the coil spring 6 during the opening operation. If the tension means 6 is a disc spring, buckling can be prevented even with a configuration in which the guide portion is not provided.

  With the configuration and operation described above, the same effect as that of the second embodiment can be obtained.

(A) is sectional drawing which shows the closing state of the interruption | blocking site | part of the puffer type gas circuit breaker in Embodiment 1 for implementing this invention. (B) is an enlarged view of the protrusion 3a. (C) is an enlarged view of the protrusion 7a. It is sectional drawing which shows the principal part of the state just before separation of the interruption | blocking site | part of the circuit breaker in Embodiment 1 for implementing this invention. It is sectional drawing which shows the principal part of the state which the arc immediately after the breaking of the interruption | blocking site | part of the circuit breaker in Embodiment 1 for implementing this invention generate | occur | produced. It is sectional drawing which shows the principal part of the closing state of the interruption | blocking part of the circuit breaker in Embodiment 2 for implementing this invention. It is sectional drawing which shows the principal part of the state just before isolation | separation of the breaking part of the circuit breaker in Embodiment 2 for implementing this invention. It is sectional drawing which shows the principal part of the state which the arc generate | occur | produced immediately after separation of the interruption | blocking site | part of the circuit breaker in Embodiment 2 for implementing this invention. It is sectional drawing which shows the principal part of the closing state of the interruption | blocking part of the circuit breaker in Embodiment 3 for implementing this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed side terminal 2 Movable side terminal 3 Fixed side contactor 3a, 3c Protrusion part 6 Coil spring (tensile means)
DESCRIPTION OF SYMBOLS 7 Movable side contactor 7a, 7c Protrusion part 7b Tapered part 9 Movable side puffer chamber 9a Spout 10 Movable side piston 11 Insulation nozzle 13 Flow path 15 Guide member 16 Fixed side puffer chamber 18 Fixed side piston 19a First check valve 19b Second check valve 31, 32, 33 Guide part (inclined surface)
71, 72, 73, 74 Invitation part (inclined surface)

Claims (7)

Fixed contact with contacts,
When the opening contact driving is started from a closed state, the contact with the fixed side contactor is opened. Movable contactor driven in the polar direction,
An engaging portion that engages the stationary contact and the movable contact with each other when the pole is closed,
When opening driving is started from the closed state, a tension means that applies a tensile force that increases as the opening driving distance increases to the stationary contact in the direction opposite to the opening direction,
In the middle of the opening drive, provided with an engagement releasing means for releasing the engagement by the driving force for applying the engagement of the engaging portion to the movable contactor and the tensile force of the pulling means ,
The engaging portion is composed of a protrusion or a groove provided at a position corresponding to each other in the fixed contact and the movable contact,
The engagement releasing means is in sliding contact with the movable contact and guides the drive of the movable contact, and as the opening driving distance increases, the engagement is released by sliding contact with the guide member. A taper portion formed on a part of the surface of the movable contact that is in sliding contact with the guide member so that the movable contact floats in a direction in which the engagement of the portion is released, and the movable The engagement portion is disengaged by a driving force applied to the side contact.
A circuit breaker characterized by that. The tension means, closing time, breaker according to claim 1, wherein applying a predetermined tensile force in the opening direction opposite to the stationary contact. Fixed contact with contacts,
When the opening contact driving is started from a closed state, the contact with the fixed side contactor is opened. Movable contactor driven in the polar direction,
A movable-side puffer chamber having an arc-extinguishing gas ejection port that is driven integrally with the movable-side contactor during opening driving;
A movable piston slidably supported in the movable puffer chamber;
Extending the contact between the fixed-side contact in said movable side contact from the ejection port of the movable puffer chamber, the insulating nozzle to form a flow path of the arc extinguishing gas,
An engaging portion that engages the stationary contact and the movable contact with each other when the pole is closed,
When opening driving is started from the closed state, a tension means that applies a tensile force that increases as the opening driving distance increases to the stationary contact in the direction opposite to the opening direction,
In the middle of the opening drive, provided with an engagement releasing means for releasing the engagement by the driving force for applying the engagement of the engaging portion to the movable contactor and the tensile force of the pulling means ,
The engaging portion is composed of a protrusion or a groove provided at a position corresponding to each other in the fixed contact and the movable contact,
The engagement releasing means is in sliding contact with the movable contact and guides the drive of the movable contact, and as the opening driving distance increases, the engagement is released by sliding contact with the guide member. A taper portion formed on a part of the surface of the movable contact that is in sliding contact with the guide member so that the movable contact floats in a direction in which the engagement of the portion is released, and the movable The engagement portion is disengaged by a driving force applied to the side contact.
A puffer type gas circuit breaker. Fixed contact with contacts,
When the opening contact driving is started from a closed state, the contact with the fixed side contactor is opened. Movable contactor driven in the polar direction,
A movable-side puffer chamber having an arc-extinguishing gas ejection port that is driven integrally with the movable-side contactor during opening driving;
A movable piston slidably supported in the movable puffer chamber;
An insulating nozzle that extends from a jet port of the movable side puffer chamber to a contact point of the movable side contactor with the fixed side contactor, and forms a flow path of the arc extinguishing gas;
An engaging portion that engages the stationary contact and the movable contact with each other when the pole is closed,
When opening driving is started from the closed state, a tension means that applies a tensile force that increases as the opening driving distance increases to the stationary contact in the direction opposite to the opening direction,
Engagement release means for releasing the engagement by the driving force for applying the engagement of the engagement portion to the movable contactor and the tensile force of the tension means during the opening drive,
The stationary puffer chamber formed a stationary side contact as one faces,
One end of which is joined to the pulling means, slidably supported stationary piston to said stationary puffer chamber,
A first check valve disposed on a surface formed by the fixed-side contactor of the fixed-side puffer chamber, for sucking gas into the fixed puffer chamber;
The fixing said first check valve in the side puffer chamber is arranged on a surface other than the surface formed, Pas Ffa series gas having a second check valve for blowing the gas to the outside of the stationary puffer chamber Circuit breaker. The engaging portion is constituted by a protrusion or groove respectively provided on corresponding positions with each other in the movable contactor and the stationary contactor,
The engagement release means includes an invitation portion formed at the time of the separation of the stationary contact and the movable contact formed in at least one protrusion or groove of the stationary contact and the movable contact. The puffer-type gas circuit breaker according to claim 4 , wherein the puffer-type gas circuit breaker has a configuration in which engagement of the engagement portion is released by a driving force applied to the movable contact. The engaging portion is constituted by a protrusion or groove respectively provided on corresponding positions with each other in the movable contactor and the stationary contactor,
It said engaging opening means, said contact movable contact sliding, a guide member for guiding the driving of the movable contact, as the opening driving distance is increased by sliding contact with the guide member, the engagement A taper portion formed on a part of the surface of the movable contact that is in sliding contact with the guide member so that the movable contact floats in a direction in which the engagement of the portion is released, and the movable The puffer-type gas circuit breaker according to claim 4 , wherein the engagement of the engaging portion is released by a driving force applied to the side contact. The tension means, closing time, puffer type gas according to any one of claims 3 to 6, characterized in applying a predetermined tensile force in the opening direction opposite to the fixed side contact Circuit breaker.

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