HK1044069A1 - Arc-suppressing apparatus,switch equipped with this apparatus,and,arc-suppressing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arc-extinguishing apparatus, a switch and a method for arc-extinguishing which are provided with the same which allow reducing the distance between a fixed electrode and a movable electrode. SOLUTION: An arc-extinguishing chamber 31 is fixed and disposed on the side of the fixed electrode 16, where the arc occurs between the fixed electrode 16 and the movable electrode 19, at open circuit times. A movable partition 32 is supported movably in the chamber 31. The movable partition 32 is interconnected operationally to a linking mechanism L to let a partition 61a of the movable partition 32 in the chamber 31 where the arc occurs, by interlocking to the breaking operation of the movable electrode 19. When there is open circuit, the partition 61a advances into the chamber 31 so as to interrupt the arc. Accordingly, the path of the arc is bent so as to detour the partition 61a, and the insulating distance between both electrodes 16, 19 is sufficiently ensured and can be reduced.

Description

Arc extinguishing device, switch with same and arc extinguishing method

Technical Field

The present invention relates to an arc extinguishing device for eliminating an arc generated between electrodes during a circuit break, a switch having the arc extinguishing device, and an arc extinguishing method.

Background

Conventionally, as such an arc extinguishing device, there is one described in, for example, Japanese patent application laid-open No. 63-33460. That is, as shown in fig. 9(a) to 9(c), the arc extinguishing device 91 has a pair of arc extinguishing chambers 92, 93, and arc extinguishing members 94, 95 are supported in the two arc extinguishing chambers 92, 93 to be tiltable relative to each other. The two arc extinguishing members 94, 95 have a tendency to approach each other by the elastic force of a spring 96 disposed between the respective outer surface and the inner surface of the two arc extinguishing chambers 92, 93. The movable electrode 97 can enter between the two arc extinguishing members 94, 95 against the spring force.

In the open state shown in fig. 9(a), the movable electrode 97 is located between the two arc extinguishing members 94, 95 and contacts a fixed electrode (not shown) disposed below the two arc extinguishing chambers 92, 93. When the switch is turned off from the closed state, as shown in fig. 9(b), as the movable electrode 97 is pulled out from between the two arc extinguishing members 94, 95, the two arc extinguishing members 94, 95 move from the fixed electrode side to the space where the movable electrode 97 is sequentially closed by the elastic force of the spring 96. Subsequently, as shown in fig. 9(c), when the movable electrode 97 is completely pulled out from between the two arc extinguishing members 94, 95, the arc generated between the fixed electrode and the movable electrode 97 is cut off by the inner surfaces of the two arc extinguishing members 94, 95 being in close contact with each other.

However, in the conventional arc extinguishing device 91 described above, the inner surfaces of the two arc extinguishing members 94, 95 are not in complete close contact at the time of disconnection, but a gap is formed. Therefore, the arc is not completely cut off, and there is a fear that there is a risk of reignition. Therefore, between the fixed electrode and the movable electrode 97, a certain insulation distance must be provided to maintain insulation between the two electrodes, and thus, the reduction of the interval between the two electrodes is limited.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide an arc extinguishing device capable of shortening a distance between a fixed electrode and a movable electrode, a switch having the arc extinguishing device, and an arc extinguishing method.

The arc extinguishing method of a switch of the invention, extinguish the electric arc produced between fixed electrode and movable electrode in the arc extinguishing chamber fixed on the fixed electrode side during the circuit breaking, characterized by that, have arc extinguishing chamber and partition wall part that is set up rotatably relative to the arc extinguishing chamber that cover the fixed electrode, make the partition wall part enter the electric arc generating part basically perpendicular to the direction that the electric arc is elongated, with the entry of the said partition wall part, form baggy space and opening by arc extinguishing chamber, partition wall part, in the baggy space, the arc extinguishing gas produced by heat of electric arc is discharged from the opening.

An arc extinguishing device according to the present invention is an arc extinguishing device for extinguishing an arc generated between a fixed electrode and a movable electrode at the time of interruption, wherein an arc extinguishing chamber is fixedly provided on the side of the fixed electrode, a partition member is rotatably supported in the arc extinguishing chamber as a generation site of the arc generated at the time of interruption, the partition member is caused to enter the generation site of the arc in the arc extinguishing chamber in conjunction with the interruption operation of the movable electrode, a bag-like space and an opening are formed by the arc extinguishing chamber and the partition member in accordance with the entrance of the partition member, and arc-extinguishing gas generated by heat of the arc is discharged from the opening in the bag-like space.

In a switch of the present invention, a fixed electrode and an arc-extinguishing chamber covering the fixed electrode are fixed to a conductive rod protruded from an inner end of a sleeve penetrating a switch body case, a partition member is pivotally supported on a side surface of an accommodating portion of the arc-extinguishing chamber, a slit into which the partition wall member can enter is formed at the base end of the micro-gap arc-extinguishing chamber of the arc-extinguishing chamber, and on the conductive rod protruded from the inner end of the sleeve of the other side, the contact blade is pivotally supported on the movable electrode so as to be capable of contacting and separating from the fixed electrode, and a support shaft which is pivotally moved in conjunction with an external operation is pivotally moved in conjunction with the contact blade by a link mechanism, the partition member may be inserted into the slit, and a pocket space and an opening portion may be formed by the arc extinguishing chamber and the partition member in accordance with the insertion of the partition member, and arc-extinguishing gas generated by heat of the arc may be discharged from the opening portion in the pocket space.

A first aspect of the present invention is an arc extinguishing method for a switch that extinguishes an arc generated between a fixed electrode and a movable electrode in an arc extinguishing chamber fixed to the fixed electrode side at the time of opening (opening), wherein a partition member is inserted into an arc generating portion substantially perpendicular to a direction in which the arc is elongated.

A second aspect of the present invention is the invention according to the first aspect, wherein the partition member is inserted into the arc generating unit in conjunction with a breaking operation of the movable electrode.

A third aspect of the present invention is an arc extinguishing device for extinguishing an arc generated between a fixed electrode and a movable electrode at the time of interruption, wherein an arc extinguishing chamber is fixedly provided on the fixed electrode side, and a link mechanism is provided for pivotally supporting a partition member on the fixed electrode side and for moving the partition member into an arc extinguishing chamber in which an arc is generated in conjunction with an interruption operation of the movable electrode, when an arc generating portion generated between the fixed electrode and the movable electrode at the time of interruption is provided in the arc extinguishing chamber.

A fourth aspect of the present invention is the invention according to the third aspect, wherein a slit for inserting the partition member is formed by cutting out a portion near the fixed electrode of the arc-extinguishing chamber, and the partition member is provided with a latch for closing the slit from the outside in the open state.

A fifth aspect of the present invention is the invention of the third or fourth aspect, wherein the partition member is formed in an arc plate shape, and a fan-shaped side wall covering both sides of the arc-extinguishing chamber is provided, and a link mechanism capable of operating the movable electrode from the outside while being supported to the fixed electrode side by a bearing portion provided on the side wall is drivingly connected to a support shaft provided on the side wall, and the partition member is allowed to enter an arc-generating portion of the arc-extinguishing chamber at the time of interruption.

A sixth aspect of the present invention is characterized in that a fixed electrode and an arc-extinguishing chamber covering the fixed electrode are fixed to a conductive rod provided projecting from an inner end of one sleeve penetrating a switch case, a partition member is supported on a side surface of a housing portion of the arc-extinguishing chamber, a slit into which the partition member can enter is formed at a base end of a micro-gap arc-extinguishing chamber of the arc-extinguishing chamber, a movable electrode is supported by a contact blade of the conductive rod projecting from an inner end of the other sleeve so as to be able to contact and separate from the fixed electrode, a support shaft rotating in conjunction with an external operation is linked rotatably to the contact blade by a link mechanism, and the partition member can enter the slit by the link mechanism.

A seventh aspect of the present invention is the gist of the present invention according to the sixth aspect, wherein the arc-extinguishing chamber is composed of a holding portion of a fixed electrode fixed to the conductive rod, and a micro-gap arc-extinguishing chamber inclined with respect to a top surface thereof, and a slit into which the partition wall member enters is formed at a base end of the micro-gap arc-extinguishing chamber in the vicinity of the fixed electrode.

An eighth aspect of the present invention is the gist of the invention according to the sixth or seventh aspect, wherein the accommodating portion is constituted by a lower accommodating portion and an upper accommodating portion which are mutually assemblable, and the fixed electrode is accommodated therein.

A ninth aspect of the present invention is the invention according to any one of the sixth to eighth aspects, wherein a support shaft capable of supporting the partition member is provided in the housing portion.

A tenth aspect of the present invention is summarized as the invention according to the eighth or ninth aspect, wherein semi-cylindrical protrusions facing each other are provided on the lower receiving portion and the upper receiving portion, respectively, and a support shaft rotatably supporting the partition member is constituted by the two protrusions when the two portions are assembled.

An eleventh aspect of the present invention is the invention according to any one of the eighth to tenth aspects, wherein the partition member is moved such that a discharge direction of the arc-extinguishing gas generated by the arc heat is away from a locus of the movable electrode.

In the invention described in the first aspect, the partition wall member is caused to enter the arc generating portion substantially perpendicularly to the direction in which the arc is elongated. Therefore, the arc path is curved around the partition member, and the arc path, i.e., the arc lengthening distance, is increased as compared with the straight line. The arc bending ratio increases as the partition wall member enters the arc generating portion.

In the invention according to the second aspect, in addition to the operation of the invention according to the first aspect, the partition member is caused to enter the arc generating portion in conjunction with the opening operation of the movable electrode.

In the invention according to the third aspect, the partition wall member is caused to enter the arc extinguishing chamber in which the arc is generated in conjunction with the opening operation of the movable electrode.

In the invention according to the fourth aspect, in addition to the effect of the invention according to the third aspect, in the disconnection state, the slit is closed from the outside by the latch.

In the invention according to the fifth aspect, in addition to the action of the invention according to the third or fourth aspect, the partition member is caused to enter the arc generating portion of the arc extinguishing chamber in conjunction with the opening operation of the movable electrode.

In the invention according to the sixth aspect, the partition wall member enters the slit in rotational interlock with the movable electrode operated by the outside.

In the invention according to a seventh aspect, in addition to the function of the invention according to the sixth aspect, the partition member enters between the housing portion and the micro-gap interrupting chamber at the time of the interruption, and the arc path is bent so as to bypass the partition member.

In the invention according to the eighth aspect, in addition to the effect of the invention according to the sixth or seventh aspect, the fixed electrode is accommodated in a space formed by the lower accommodating section and the upper accommodating section. The lower receiving portion is fixed to the fixed electrode, and the upper receiving portion is mounted to the fixed lower receiving portion.

In the invention according to a ninth aspect, in addition to the function of the invention according to one of the sixth to eighth aspects, the partition member is supported by the accommodating portion.

In the invention described in the tenth aspect, in addition to the effects of the invention described in the eighth or ninth aspect, when the lower receiving portion and the upper receiving portion are assembled, the cylindrical support shaft is constituted by the semi-cylindrical protrusions provided on the respective receiving portions.

In the invention according to an eleventh aspect, in addition to the operation of the invention according to any one of the eighth to tenth aspects, when the lower housing portion, the arc extinguishing chamber, and the partition wall member are assembled, the inside of the arc extinguishing chamber is formed into a bag shape so that the arc extinguishing gas is discharged in any direction. The discharge direction of the arc-extinguishing gas is away from the trajectory of the movable electrode by the movement of the partition member.

According to the invention described in the first aspect, the flashover distance between the fixed electrode and the movable electrode is extended, and the distance between the fixed electrode and the movable electrode can be shortened.

According to the second aspect and the invention described in any one of the fifth to seventh aspects, the partition member enters the arc generating portion at the timing corresponding to the generation of the arc, and thereby the insulation resistance can be effectively increased.

According to the invention described in the third aspect, the partition member can be interlocked with the opening operation of the movable electrode with a simple structure.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, it is possible to prevent the arc-extinguishing gas generated in the arc-extinguishing chamber during the interruption from leaking through the slit.

According to the invention of the eighth aspect, in addition to the effect of the invention of the sixth or seventh aspect, the accommodating portion can be simply attached to the fixed electrode.

According to the invention described in the ninth aspect, in addition to the effect of the invention described in any one of the sixth to eighth aspects, the partition member can be rotated about the support shaft as a fulcrum.

According to the invention of the tenth aspect, in addition to the effect of the invention of the eighth or ninth aspect, the lower housing portion and the upper housing portion can be more firmly connected by axially supporting the partition member with respect to the support shaft.

According to the invention of the eleventh aspect, in addition to the effect of the invention of the sixth to eighth aspects, by discharging the arc-extinguishing gas in the direction away from the movable electrode track, re-striking is less likely to occur even when arc-extinguishing performance is reduced by arc-extinguishing chamber loss.

Drawings

Fig. 1 is a main sectional view of the switch.

Fig. 2 is a front view of the switch unit in the on state.

Fig. 3 is an exploded perspective view illustrating installation of an arc extinguishing device.

Fig. 4(a) is an exploded front view of the arc extinguishing chamber.

Fig. 4(b) is an exploded side view of the arc chute.

Fig. 5(a) is a front view of the movable partition member.

Fig. 5(b) is a side view of the movable partition member.

Fig. 6 is a front view of the switch section in the open position.

Fig. 7 is a front view of the switch unit in an open state.

Fig. 8(a) is a partial sectional view taken along line 1-1 of fig. 2.

Fig. 8(b) is a partial sectional view taken along line 2-2 of fig. 6.

Fig. 9 is a front view of a switching section of another embodiment.

Fig. 10 is a front view of a switching section of another embodiment.

Fig. 11(a) - (c) are main sectional views of a conventional arc-extinguishing chamber.

Description of the symbols

11-a switch; 12-a switch housing; 13-power supply side bushing; 14-load side bushing; 15-a conductive rod; 16-a fixed electrode; 17-a conductive rod; 19-a movable electrode; 19 a-a contact edge; 30-an arc extinguishing device; 31-arc chute body (arc chute); 32-a movable partition member; 41-an accommodation part; 42-micro-gap arc extinguishing chamber; 43-a lower receptacle; 44-an upper receptacle; 49. 54-a protrusion; 57-sewing; 60-supporting the shaft; 61 a-partition members; 61 b-side wall; 62-a bearing portion; 64-an actuating pin; 65-latch; an L-link mechanism;

Detailed Description

An embodiment of the present invention implemented on a switch is described below with reference to fig. 1 to 8.

As shown in fig. 1, each of three phases (only one phase is shown in fig. 1) of the power source side bushing 13 and the load side bushing 14 is supported through the opposite side walls of the switch case 12 of the switch 11 so as to face each other. A conductor bar 15 is projected on the inner end portion of the power supply side sleeve 13, and a fixed electrode 16 is fixed on the top face of the conductor bar 15 (see fig. 3). A conductor bar 17 is provided projecting on the inner end portion of the load-side bushing 14, and the root of a movable electrode 19 is rotatably supported on the conductor bar 17 through a shaft 18. The movable electrode 19 is constituted by one plate-like contact blade 19 a.

On the other hand, on the bottom inside the switch case 12, a rotating shaft 20 drivingly connected to an operating handle (not shown) outside the switch case 12 is provided through a switch mechanism portion (not shown) composed of a plurality of levers. The lever 21 is integrally rotatably fixed to the rotary shaft 20. One end of the driving lever 22 is rotatably connected to the front end of the lever 21. The other end of the drive lever 22 is rotatably connected to substantially the center of the movable electrode 19. Further, one end of the actuating lever 23 is rotatably connected to the front end of the lever 21.

Therefore, when the operating handle is operated, the movable electrode 19 is moved about the shaft 18 by the switch mechanism portion, the rotating shaft 20, the lever 21, and the drive lever 22 between the input position shown by the solid line in fig. 1 and the open position shown by the two-dot chain line in fig. 1. When the movable electrode 19 can be operated from the outside, the switching mechanism portion, the rotating shaft 20, the lever 21, and the actuating lever 23 constitute a link mechanism L that moves a partition member 61 described later into an arc extinguishing chamber 31 described later that generates an arc.

(arc-extinguishing device)

As shown in fig. 2, an arc extinguishing device 30 is provided on the inner end portion of the power supply side bushing 13. The arc extinguishing device 30 includes an arc extinguishing chamber 31 covering the fixed electrode 16, and a movable partition member 32 provided rotatably with respect to the arc extinguishing chamber 31. The arc-extinguishing chamber 31 and the movable partition member 32 are made of synthetic resin having insulating and arc-extinguishing properties such as polyester, polytetrafluoroethylene, melamine, urea, and nylon.

As shown in fig. 3, arc extinguishing chamber 31 includes accommodating portion 41 covering conductive rod 15 and fixed electrode 16, and micro-gap arc extinguishing chamber 42 inclined with respect to the top surface of accommodating portion 41. The arc extinguishing chamber 31 has an arc generating portion for generating an arc during the breaking. As shown in fig. 3, 4(a) and 4(b), the accommodating portion 41 is composed of a lower accommodating portion 43 and an upper accommodating portion 44 which can be assembled with each other.

As shown in fig. 3, the lower receiving portion 43 has a bottom wall member 45 constituting the bottom wall of the receiving portion 41. On the top surface of the bottom wall member 45, a flat U-shaped frame-shaped connecting portion 46 that opens on the power supply side bushing 13 side is protruded. As shown in fig. 3, 4(a) and 4(b), the power-supply-side bushing 13 side portion is a pair of side wall portions 47 and 47 that constitute both side wall portions of the housing portion 41 from substantially the center of the connecting portion 46.

Semi-cylindrical protrusions 49 are formed on the outer surfaces of both side wall portions 47, respectively, and the power source side sleeve 13 side surfaces of the protrusions 49 are made flat surfaces 49 a. The reverse power supply side bushing 13 of the connecting portion 46 becomes an engagement portion 48 that can enter the upper receiving portion 44. As shown in fig. 3, the lower housing portion 43 is fixed to the bottom surface of the conductive rod 15 by fastening a nut N from below to a bolt B that passes through the fixed electrode 16 and the conductive rod 15 from above.

As shown in fig. 3, the upper receiving portion 44 is box-shaped with an open bottom. On both side walls 51, 51 of the upper housing portion 44, cutouts 52, 52 (only one is shown in fig. 3) are formed, respectively. As shown in fig. 4(a), the cutout 52 is provided in a concavo-convex relationship with the side wall 47 of the lower receiving portion 43. As shown in fig. 3 and 4(b), semi-cylindrical projections 54, 54 are formed on both side wall portions 51, respectively, and the opposite power source side sleeve 13 side of the two projections 54, 54 is made into a flat surface 54 a.

As shown in fig. 2 and 3, the upper receiving portion 44 is fitted from above into the lower receiving portion 43 fixed to the conductor bar 15, and is fixed to the inner end portion of the power source side sleeve 13. As shown in fig. 4(a), the side wall portions 47, 47 of the lower receiving portion 43 and the side wall portions 51, 51 of the upper receiving portion 44 are held in an engaged state with each other. The engagement portion 48 of the lower receiving portion 43 is located in the upper receiving portion 44. The flat surfaces 49a, 54a of the two projections 49, 54 are identical, and the two projections 49, 54 constitute a cylindrical support shaft 60. As shown in fig. 4(b), a groove 55 is continuously formed from the upper wall of the upper housing portion 44 to the central portion of the side wall of the load side bushing 14 side, and the movable electrode 19 can pass through the groove 55.

As shown in fig. 3, 4(a) and 4(b), the micro-gap arc-extinguishing chamber 42 has a pair of micro-gap arc-extinguishing members 56a and 56a facing each other sandwiching the groove 55 of the upper housing portion 44. The two micro-gap arc extinguishing members 56a, 56a are spaced apart to such an extent that the movable electrode 19 can pass therethrough. The two micro-gap arc extinguishing members 56a, 56a are angled with respect to the top surface of the upper receiving portion 44 and extend from the top surface of the upper receiving portion 44 up to the upper center of the side surface on the reverse power supply side bushing 13 side, and the front ends of the two micro-gap arc extinguishing members 56a, 56a are enlarged in the direction of separation.

As shown in fig. 3 and 4(a), arc-shaped slits 57 having a predetermined radius of curvature are formed at the bottom ends of the two micro-gap arc extinguishing members 56a, 56a in the vicinity of the fixed electrode 16. As shown in fig. 3 and 4(a), arc-shaped plate-shaped lower guide portions 58 are provided on the outer surfaces of the two arc-quenching micro-components 56a and 56a so as to protrude along the lower edge portions of the slits 57. On the outer surfaces of the two micro-gap arc extinguishing members 56a, an arc-shaped plate-shaped upper guide portion 59 is projected above the slit 57 at a predetermined distance from the top surface of the lower guide portion 58.

(Movable partition wall Member)

As shown in fig. 2 and 3, the movable partition member 32 has a housing chamber 61 covering a part of the housing portion 41, a side wall of the housing chamber 61 on the load side insulating ceramic pipe 14 side is formed into a circular arc-shaped partition member 61a having a predetermined radius of curvature, and the partition member 61a is formed so as to be able to enter the slit 57.

As shown in fig. 3, 5(a), and 5(b), the accommodation chamber 61 has a pair of fan-shaped side wall portions 61b, 61b facing each other. Semicircular bearing portions 62 are projected from the side walls 61b, 61b on the power supply side bushing 13 side, and through holes 63 are formed in the bearing portions 62. Actuator pins 64 are provided in the vicinity of the centers of the partition members 61a of the two side wall portions 61b, respectively, so as to protrude therefrom.

As shown in fig. 2, the support shaft 60 passes through the through hole 63 of the bearing portion 62, and the movable partition member 32 is rotatably supported with respect to the arc-extinguishing chamber 31. The other end of the actuating lever 23 is rotatably connected to two actuating pins 64. Therefore, the movable partition member 32 moves between the input corresponding position shown in fig. 2 and the open corresponding position shown in fig. 7 with the support shaft 60 as a fulcrum by the switch mechanism (not shown), the rotating shaft 20, the lever 21, the actuation lever 23, and the actuation pin 64 in accordance with the operation of the operating knob.

As shown in fig. 3, 5(a) and 5(b), a pair of circular arc-shaped latches 65 project from the upper portion of the outer surface of the partition member 61a so as to intersect the partition member 61a perpendicularly. The two latch members 65 are separated from each other by a predetermined distance and can enter between the lower guide portion 58 and the upper guide portion 59 and can slide against the outer surfaces of the two micro-gap arc extinguishing members 56a, respectively. In the insertion state shown in fig. 2, the locking member 65 locks the slot 57 from the outside.

As shown in fig. 3, 5(a), and 5(b), circular arc-shaped guided portions 66 are formed on the lower edge portions of the protruding portions of the partition wall members 61a of the two latch members 65 so as to intersect the latch members 65 at right angles. The two guided portions 66 can slide along the top surface of the lower guide portion 58.

Next, the operation of the switch 11 configured as described above when turned off will be described.

In the throw-in state shown in fig. 2, when the handle is operated to perform the disconnecting operation, the movable electrode 19 is rotated rightward around the shaft 18. Subsequently, as shown in fig. 6, when the movable electrode 19 is moved away from the fixed electrode 16, an arc occurs between the two electrodes 16, 19. With the right turn of the movable electrode 19, the movable electrode 19 moves from below to above between the two micro-gap arc extinguishing members 56a, 56 a. That is, the movable electrode 19 is sandwiched between the two arc extinguishing members 56a and 56a, and the arc generated between the two electrodes 16 and 19 is elongated while being subjected to the micro-gap arc extinguishing. The arc-extinguishing gas generated by the arc heat promotes arc extinction. As shown in fig. 8(a), the slit 57 is closed by the latch 65, thereby preventing the arc-extinguishing gas from leaking out through the slit 57, thereby improving the arc-extinguishing performance of the arc-extinguishing device 30.

On the other hand, with the disconnecting operation of the operating handle, the lever 21 is rotated right, and the actuating lever 23 is moved up. The movable partition member 32 is moved upward by an actuating pin 64 and is turned left centering on the support shaft 60. As shown in fig. 6 and 8(b), the partition member 61a smoothly enters the slit 57 while being guided by the lower guide portion 58 by the guide portion 66. That is, the partition member 61a enters the arc generating portion between the two electrodes 16 and 19 in the arc extinguishing chamber 31 substantially perpendicularly to the direction in which the arc is elongated.

In other words, the partition member 61a blocks the linear movement of the arc generating portion of the fixed electrode 16 and the arc generating portion of the movable electrode 19. The partition member 61a blocks the generated arc from being located between the two electrodes 16, 19. Therefore, as shown in fig. 6, the arc path bypasses the curve of the partition member 61a, and the arc path, that is, the arc lengthening distance is increased as compared with the straight line. The curvature of the arc path increases as the partition member 61a enters the slit 57.

When the movable electrode 19 moves to the open position shown in fig. 7, the arc is completely extinguished and the circuit break is completed. At this time, the arc path is bent as shown in fig. 7 to an extent sufficient to secure the insulation distance between the two electrodes 16, 19. That is, after the end of the interruption operation, the partition member 61a functions as an insulating layer between the same phases, and the insulation resistance between the electrodes 16 and 19 is increased. Therefore, the distance between the two electrodes 16, 19 can be shortened. In addition, the reverse operation to the open circuit may be performed when the circuit is closed.

Therefore, according to the present embodiment, the following effects can be obtained.

(1) At the time of the interruption, the partition wall member 61a is caused to enter the arc generation site substantially perpendicularly to the arc elongation direction. Therefore, the arc path is bent around the partition member 61a, and the arc elongation distance is increased as compared with the case of a straight line. Thus, the distance between the fixed electrode 16 and the movable electrode 19 can be shortened.

(2) The arc generating portion entering the partition member 61a is operated in conjunction with the opening operation of the movable electrode 19. That is, the partition member 61a enters the arc generating portion at the time of the generation of the arc, and the insulation resistance between the electrodes 16 and 19 can be effectively increased.

(3) The movable partition member 32 is rotatably supported with respect to the arc-extinguishing chamber 31 fixedly provided on the fixed electrode 16 side. Further, a link mechanism L is provided which rotates the movable partition member 32 in conjunction with the breaking operation of the movable electrode 19 and which causes the partition member 61a to enter the arc-extinguishing chamber 31 where the arc is generated. Therefore, the partition member 61a can be interlocked with the disconnection operation of the movable electrode 19 by a simple structure.

(4) A slit 57 for allowing the partition wall member 61a to enter is formed in the arc extinguishing chamber 31 in a cut-away manner in the vicinity of the fixed electrode 16. In the disconnected state, a latch 65 that closes the slit 57 from the outside is provided on the partition wall member 61 a. Therefore, at the time of disconnection, the arc-extinguishing gas generated in the arc-extinguishing chamber 31 can be prevented from leaking through the slit 57.

(5) The housing portion 41 for housing the fixed electrode 16 is composed of a lower housing portion 43 and an upper housing portion 44 which can be assembled with each other. That is, when the lower housing portion 43 is fixed to the conductive rod 15 by the bolt B and the nut N, the upper housing portion 44 is fitted into the lower housing portion 43 from above. Therefore, the installation of the arc extinguishing chamber 31 into the fixed electrode 16 becomes simple.

(6) The semi-cylindrical protrusions 49, 54 corresponding to each other are provided on the lower receiving portion 43 and the upper receiving portion 44, and a support shaft 60 that rotatably supports the movable partition member 32 is constituted by these two protrusions 49, 54 when the lower receiving portion 43 and the upper receiving portion 44 are assembled, so that by supporting the movable partition member 32 on the support shaft 60, the upper receiving portion 43 and the lower receiving portion 44 are more firmly connected while a stable insertion action of the movable partition member 32 of the arc-extinguishing chamber 31 is obtained.

Further, the above-described embodiment may also be implemented in a modified manner as described below.

The arc extinguishing chamber 31 may also be formed as shown in fig. 9. That is, the discharge hole 31b is formed in the v-shaped link 31a connecting the power-supply-side bushing 13 sides of the two micro-gap arc extinguishing members 56a, 56 a. The discharge hole 31b is formed above the opening 30 a. In this way, as the movable partition member 32 moves, the pressure in the pocket space X formed by the arc extinguishing chamber body 31, the movable partition member 32, and the bottom wall 45 is immediately increased by the thermal energy generated by the arc and the arc-extinguishing gas generated by the thermal decomposition of the arc extinguishing chamber 31 and the like. This is because the area of the discharge port of the arc-extinguishing gas, that is, the opening area of the opening 30a is reduced by the movement of the movable partition member 32. As the pressure in the space X increases, the arc-extinguishing gas is discharged from the opening 30a, and the arc-extinguishing gas discharged from the opening 30a is discharged to the outside of the arc extinguishing device 30 through the discharge hole 31 b. That is, the partition member 61a moves the arc-extinguishing gas discharge direction away from the movable electrode 19 trajectory. In the present embodiment, the arc-extinguishing gas is discharged upward without being discharged toward the movable electrode 19. Generally, since the arc is blocked while extinguishing the arc, diffused electrons are mixed in the arc-extinguishing gas. Therefore, for example, when the arc extinguishing performance is degraded due to consumption of the arc extinguishing chamber 31, if the gas with diffused electrons and degraded arc extinguishing performance is discharged to the movable electrode 19, the movable electrode 19 is in an open state, and even if the arc extinguishing is completed, there is a possibility that the gas is fused with a certain time delay to cause a re-arcing phenomenon. In the present embodiment, the arc-extinguishing gas is discharged upward without being discharged toward the movable electrode 19, and therefore, even if the arc-extinguishing performance is degraded by the consumption of the arc-extinguishing chamber 31 or the like, re-striking is difficult to occur.

Further, as shown in fig. 10, the arc extinguishing chamber 31 may be formed. That is, the upper portion of the v-shaped portion of the connection portion 31a may be omitted. In this way, the arc-extinguishing gas is discharged upward without being discharged to the movable electrode 19, as in the case where the discharge holes 31b are formed in the connection portion 31 a. Therefore, even if the arc extinguishing performance of the arc extinguishing device 30 is reduced, re-arcing can be prevented.

The opening portion formed by the arc extinguishing device 30, the fixed electrode 16, the movable electrode 19, the link mechanism L, and the like shown in fig. 1, 9, and 10 may be arranged upside down. For example, when the device is thrown, the movable electrode 19 is turned left around the shaft 18 and contacts the fixed electrode 17 from below. When opened, the opening 30a is located below fig. 1, 9, and 10, and the arc-extinguishing gas is discharged downward. In this way, the arc-extinguishing gas is not discharged to the movable electrode 19, and re-arcing due to a decrease in arc-extinguishing performance due to consumption of the arc-extinguishing chamber 31 or the like can be prevented.

Although the present invention is applied to the switch 11 having the movable electrode 19 constituted by one plate-like contact blade 19a in the present embodiment, it may be applied to a switch having a movable electrode constituted by two plate-like contact blades. That is, the arc generated between the two contact blades and the fixed electrode is interrupted to allow the partition wall to enter therebetween, thereby shortening the distance between the two electrodes.

Claims (3)

1. An arc extinguishing method for a switch, which extinguishes an arc generated between a fixed electrode and a movable electrode in an arc extinguishing chamber fixed to the fixed electrode side at the time of disconnection,

having an arc chamber arranged to cover the stationary electrode and a partition member rotatably arranged relative to the arc chamber,

the partition wall members are introduced into the arc generating portion substantially perpendicularly to the direction in which the arc is elongated,

the arc-extinguishing chamber and the partition member form a bag-shaped space and an opening with the partition member inserted,

in the pocket space, arc-extinguishing gas generated by the heat of the arc is discharged from the opening portion.

2. An arc extinguishing device for extinguishing an arc generated between a fixed electrode and a movable electrode at the time of disconnection,

the arc extinguishing chamber is fixedly arranged at the fixed electrode side,

the arc-extinguishing chamber is a place where an arc is generated during the disconnection,

the partition member is rotatably supported by the support member,

and the partition wall member is caused to enter the arc generation site in the arc extinguishing chamber in conjunction with the opening operation of the movable electrode,

the arc-extinguishing chamber and the partition member form a bag-shaped space and an opening with the partition member inserted,

in the pocket space, arc-extinguishing gas generated by the heat of the arc is discharged from the opening portion.

3. A kind of switch is disclosed, which is composed of a switch body,

the fixed electrode and the arc-extinguishing chamber covering the fixed electrode are fixed on a conductive rod protruding from the inner end of one sleeve penetrating the switch body case,

the partition member is pivotally supported on the side of the accommodating portion of the arc-extinguishing chamber,

a slit into which the partition wall member can enter is formed on the base end of the micro-gap arc extinguishing chamber of the arc extinguishing chamber,

the contact blade of the conductive rod protruding from the inner end of the other sleeve is pivotally supported to be capable of contacting and separating the movable electrode from the fixed electrode,

a support shaft rotating in conjunction with an external operation is rotatably linked to the contact blade by a link mechanism,

it is possible to let the partition wall members enter the slit,

the arc-extinguishing chamber and the partition member form a bag-shaped space and an opening with the partition member inserted,

in the pocket space, arc-extinguishing gas generated by the heat of the arc is discharged from the opening portion.