JP3756746B2 - Switch, arc extinguishing device and arc extinguishing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch for extinguishing an arc generated between electrodes when opened, an arc extinguishing device, and an arc extinguishing method.
[0002]
[Prior art]
  Figure18As shown in the figure, bushings 93 and 94 facing each phase are penetrated and supported on both side walls of the main body case 92 of the switch 91. A fixed electrode 95 is provided at the inner end of one bushing 93, and a movable electrode 96 is provided on the other bushing 94 so as to be rotatable about a shaft 97. An arc extinguishing member 98 extends downward from the fixed electrode 95 so as to cover it. The movable electrode 96 can be inserted into the arc extinguishing chamber 98b through an insertion port 98a formed at the lower end of the arc extinguishing member 98. An opening / closing shaft 99 is rotatably supported on the upper portion of the main body case 92, and the opening / closing shaft 99 is connected to the movable electrode 96 of each phase via a lever 100 and a link 101. One end of the opening / closing shaft 99 is connected to an opening / closing mechanism section (not shown) composed of a plurality of links and the like. As the opening / closing mechanism section is driven, the movable electrode 96 moves the opening / closing shaft 99, the lever 100 and the link 101. To and from the fixed electrode 95. When the switch 91 is opened, an arc generated between the tip of the fixed electrode 95 and the tip of the movable electrode 96 is confined in the arc extinguishing chamber 98b of the arc extinguishing member 98 and arc extinguishing gas and slits are generated. The arc is extinguished by the effect.
[0003]
[Problems to be solved by the invention]
However, at the time of opening, it is necessary to provide a certain insulation distance between the fixed electrode 95 and the movable electrode 96 in order to maintain insulation between the electrodes 95 and 96. For this reason, there is a limit to shortening the insulation distance between the electrodes 95 and 96, and there is a problem that it is difficult to reduce the size of the switch 91 in the in-phase direction.
[0004]
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a switch, an arc extinguishing device and an arc extinguishing method capable of shortening the insulation distance between the fixed electrode and the movable electrode. Is to provide.
[0005]
[Means for Solving the Problems]
  According to a first aspect of the present invention, in the arc extinguishing method of the switch, the movable electrode is spaced from the fixed electrode, and the arc generated and stretched between the two electrodes is extinguished in the arc extinguishing chamber. Attached part that is attached in a movable manner and a movable electrodeArc with rotationThe arc extinguishing part for arc extinguishing the slit and a partition member for extending the arc by entering the arc generating part with the movement at the time of opening the circuit, and the arc extinguishing chamber formed integrally with these parts are externally operated. Linked to an open / close mechanism that transmits an open / close operation to the movable electrode via an operation link, and is configured to be rotatable in the direction opposite to the rotation direction of the movable electrode in conjunction with an external operation. When the circuit is opened, the arc extinguishing part of the arc extinguishing chamber follows the movable electrode synchronously and moves in a direction including the component of the arc stretching direction generated between the two electrodes, so that the arc is drawn while being extinguished by the slit. When the movable electrode and the arc extinguishing chamber are further rotated, the bulkhead member enters the arc generation site and increases the arc stretching distance.
[0006]
  According to the second aspect of the present invention, a pair of bushings penetratingly supported so as to be opposed to each phase on both side walls of the main body case, a fixed electrode provided at an inner end of one bushing, and a bushing of the other bushing A movable electrode is provided at the inner end so as to be rotatable and can be moved toward and away from the fixed electrode, and an inner end of the one bushing is provided so as to cover the fixed electrode, and the movable electrode is separated from the fixed electrode. In the switch provided with an arc extinguishing chamber that extinguishes the arc generated between both electrodes, the arc extinguishing chamber is pivotally mounted on the fixed electrode side so as to be pivotable, and is movable electrodeArc with rotationAn arc extinguishing part for arc extinguishing the slit, and a partition member for extending the arc by entering the arc generating part in accordance with the movement at the time of opening, and these are integrally formed, and the arc extinguishing chamber is provided with the opening / closing mechanism. The gist of the invention is that it is configured to be operatively connected to the part via an operating link and to be rotatable in the direction opposite to the rotating direction of the movable electrode in conjunction with an external operation.
[0007]
  According to a third aspect of the present invention, there is provided a pair of bushings penetratingly supported on both side walls of the main body case so as to face each phase, a fixed electrode provided at an inner end of one bushing, and a bushing of the other bushing. Opening and closing provided with a movable electrode that is pivotally provided at the inner end and that can be brought into and out of contact with the fixed electrode, and an opening and closing mechanism that transmits an opening and closing operation to the movable electrode in conjunction with an external operation. In the arc extinguishing device for a switch that extinguishes an arc generated between the two electrodes when the movable electrode is separated from the fixed electrode, the arc extinguishing device is provided on one bushing. An arc extinguishing chamber provided rotatably about an axis, the arc extinguishing chamber comprising a shaft attachment portion pivotally attached to the fixed electrode side, and a movable electrodeArc with rotationAn arc extinguishing part for arc extinguishing the slit, and a partition member for extending the arc by entering the arc generating part in accordance with the movement at the time of opening, and these are integrally formed, and the arc extinguishing chamber is provided with the opening / closing mechanism. The gist of the invention is that it is configured to be operatively connected to the part via an operating link and to be rotatable in the direction opposite to the rotating direction of the movable electrode in conjunction with an external operation.
[0008]
  The invention according to claim 4In the invention according to claim 3, the arc-extinguishing chamber moves along with the movement of the arc-extinguishing chamber, and this movement causes air in the arc-extinguishing chamber to move between the fixed electrode and the movable electrode when the circuit is opened. Provided a blower member that pushes out to blow against the generated arcThis is the gist.
[0009]
  The invention described in claim 5Claim 3 or claim 4In the invention described inA creeping distance increasing means for increasing the creeping distance between the movable electrode and the fixed electrode is provided at a portion facing the locus when the movable electrode is opened and closed in the arc extinguishing chamber.This is the gist.
[0010]
  The invention described in claim 6Claim 5In the described invention,The creeping distance increasing means is a continuous adhesion preventing means for preventing a product generated along with the arc from continuously adhering to the inner surface of the arc extinguishing chamber when the circuit is opened.This is the gist.
[0011]
  The invention described in claim 7Claim 6In the described invention,The creeping distance increasing means is a plurality of grooves formed so as to extend in a crossing direction with respect to the movement trajectory of the movable electrode.This is the gist.
[0015]
  In the invention described in claim 2,The arc extinguishing chamber moves so as to follow the arc generated between the two electrodes when the circuit is opened. In addition, the partition member enters the arc generation site with the synchronous follow-up movement of the arc extinguishing chamber. For this reason, the stretch distance of the arc is increased.
[0016]
  In invention of Claim 3,The arc extinguishing chamber rotates about an axis provided on one of the bushings, and the common part of the arc trajectory moving trajectory and the moving trajectory of the movable electrode is an extension of the arc generated between the two electrodes when the circuit is opened. It becomes a part. In addition, when the circuit is opened, the arc-extinguishing chamber moves in a direction substantially coinciding with the extending direction of the arc generated between both electrodes in conjunction with an external operation. For this reason, the arc is enclosed by the arc extinguishing chamber.
[0017]
  In the invention according to claim 4,In addition to the action of the invention described in claim 3, the blower member moves with the movement of the arc extinguishing chamber, and as a result, the air in the arc extinguishing chamber is generated between the fixed electrode and the movable electrode when the circuit is opened. It is pushed out to blow against the arc.
[0018]
  In the invention according to claim 5,In addition to the action of the invention according to claim 3 or 4, the creepage distance between the movable electrode and the fixed electrode is increased, and the withstand voltage between both electrodes is improved.
[0019]
  In the invention according to claim 6,Claim 5In addition to the functions of the described invention,When the circuit is opened, the product generated along with the arc is prevented from continuously adhering to the inner surface of the arc extinguishing chamber. For this reason, the fall of the insulation resistance of a creeping surface by a product adhering to the inner surface of an arc-extinguishing chamber is relieved.
[0020]
  In the invention according to claim 7,Claim 6In addition to the functions of the described invention,Since the plurality of grooves are provided on the inner surface of the arc extinguishing chamber in the direction intersecting the movement trajectory of the movable electrode, the creeping distance between the movable electrode and the fixed electrode is increased. For this reason, the withstand voltage between both electrodes is improved despite the simple configuration.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in an air switch will be described with reference to FIGS.
(Whole switch)
As shown in FIGS. 1 and 2, a power supply side bushing 13 and a load side bushing 14 are provided on each side wall of the body case 12 of the switch 11 opposite to each other for each of the three phases (in FIG. 1, only one phase is shown). )) So as to face each other. A rod-like fixed electrode 15 protrudes from the inner end of the power supply side bushing 13. A conductive rod 16 projects from the inner end portion of the load side bushing 14, and a base end portion of the movable electrode 18 is rotatably supported by the conductive rod 16 via a shaft 17. The movable electrode 18 includes a pair of contact blades 18a and 18b arranged in parallel.
[0024]
On the other hand, a rotating shaft 19 operatively connected to an operation handle (not shown) outside the body case 12 is provided at an upper portion in the body case 12 via a link mechanism (not shown) including a plurality of links. A lever 20 is fixed to the rotation shaft 19 so as to be integrally rotatable. One end of a drive link 21 is rotatably connected to the tip of the lever 20, and the other end of the drive link 21 is rotatably connected to the vicinity of the center of the movable electrode 18. Further, one end of an operating link 22 is rotatably connected to the tip of the lever 20.
[0025]
Therefore, when the operation handle is operated, the movable electrode 18 is moved to the closing position A shown in FIG. 1 by the solid line with respect to the shaft 17 via the link mechanism, the rotating shaft 19, the lever 20 and the drive link 21 and to the position shown in FIG. It moves between the open position B indicated by the two-dot chain line. The link mechanism, the rotating shaft 19, the lever 20, and the drive link 21 constitute an opening / closing mechanism section 23.
[0026]
On the inner wall of the main body case 12, a ground barrier V having an L-shaped cross section is fixed below the power supply side bushing 13 via a plurality of support members K. This ground-to-ground barrier V is formed of an insulating synthetic resin such as polytetrafluoroethylene, nylon, and polypropylene, and extends along the inner wall of the main body case 12 from the lower portion of the power supply side bushing 13 to the vicinity of the center of the main body case 12. So that it extends.
(Arc extinguishing member)
An arc extinguishing device 30 is provided at the inner end of the power supply side bushing 13 so as to cover the fixed electrode 15. The arc extinguishing device 30 includes a support base 31 fixed to the inner end portion of the power supply side bushing 13, and a movable arc extinguishing chamber 32 as an arc extinguishing chamber supported rotatably with respect to the support base 31. Yes. The support base 31 and the movable arc-extinguishing chamber 32 are integrally formed of a synthetic resin having insulating properties and arc-extinguishing properties such as polyacetal, polytetrafluoroethylene, melamine, urea and nylon.
[0027]
(Support stand)
As shown in FIGS. 2 and 3, the support base 31 includes a cylindrical insertion portion 33 into which the inner end portion of the power supply side bushing 13 is inserted. A pair of shafts 34 project from the outer periphery of the insertion portion 33 on the bushing insertion side so as to be positioned on opposite sides. A rectangular plate-like restricting member 35 is provided on the side opposite to the bushing insertion side of the insertion portion 33, and an insertion hole 36 through which the fixed electrode 15 can be inserted is formed at the center of the restricting member 35.
[0028]
On the front surface of the regulating member 35 on the load side bushing 14 side, a rectangular tube-shaped insertion guide member 37 projects from the periphery of the insertion hole 36, and a pair of side walls of the insertion guide member 37 facing each other are respectively provided. A notch 38 is formed. At the center of the lower side wall of the insertion guide member 37, a fan-shaped guide member 39 as a fixed insertion member projects. The arc portion of the guide member 39 faces the load side bushing 14 side. Further, one linear portion of the guide member 39 extends in the axial direction of the insertion portion 33, and the other linear portion extends downward along the regulating member 35 so as to be orthogonal to the one linear portion.
[0029]
As shown in FIG. 2, the inner end of the power supply side bushing 13 inserted into the insertion portion 33 is in contact with the restriction member 35, thereby restricting the movement of the support base 31 toward the outer end of the power supply side bushing 13. Has been. The fixed electrode 15 passes through the insertion hole 36 and the insertion guide member 37 and protrudes toward the load side bushing 14. The support base 31 is fixed to the fixed electrode 15 by screwing a set screw (not shown) into a female screw portion 15 a formed on the outer periphery of the fixed electrode 15 through a notch 38.
[0030]
(Movable arc extinguishing chamber)
As shown in FIGS. 4 and 7, the movable arc-extinguishing chamber 32 is provided so as to extend along the first housing portion 41 where the inner end portion of the power supply side bushing 13 is located and the outer peripheral center of the first housing portion 41. And a second housing portion 42 in which the distal end portion of the fixed electrode 15 is located, and the interiors of the housing portions 41 and 42 communicate with each other. A side surface on the load-side bushing 14 side of the first accommodating portion 41 is a first arc surface 41a having a predetermined radius of curvature. A side surface on the load side bushing 14 side of the second accommodating portion 42 is a second arc surface 42a having a predetermined radius of curvature.
[0031]
(First housing part)
As shown in FIGS. 3 and 4, the first housing portion 41 includes a pair of side walls 41 b and 41 b that face each other. A semicircular shaft mounting portion 43 as a shaft mounting portion protrudes from the both side walls 41b, 41b on the power supply side bushing 13 side, and an insertion hole 44 is formed in the coaxial mounting portion 43. In addition, an operating pin 45 is provided in the vicinity of the center of both side walls 41b and 41b near the first arc surface 41a. As shown in FIG. 2, the other end of the operation link 22 is rotatably connected to the operation pins 45, respectively.
[0032]
(Second housing part)
As shown in FIGS. 4-9, the 2nd accommodating part 42 is equipped with a pair of side wall 51a, 51a which mutually opposes, and the to-be-guided member 52 as a partition member which connects both side wall 51a, 51a. The guided member 52 is extended to the middle of the base end portions of the side walls 51a, 51a, that is, to the position of line XX in FIG. The outer surface of the guided member 52 is the second arc surface 42a, and the inner surface is a guided surface 42b. Outer slit walls 53 project outwardly from the base end portions of the side walls 51a and 51a, respectively. On the base end side of the guided member 52, a central slit wall 54 as a sandwiching member is provided so as to be positioned in the middle of both outer slit walls 53. A slit arc extinguishing portion 55 into which the movable electrode 18 can be inserted is constituted by the outer slit wall 53 and the central slit wall 54.
[0033]
In the second accommodating portion 42, a blow chamber 42c is formed by the first arc surface 41a, the second arc surface 42a, both side walls 51a, 51a, and a blocking wall 51b as a blowing member. As shown in FIGS. 8 and 9, the opening 42d of the chamber 42c is disposed so as to face the direction opposite to the rotation direction of the movable electrode 18 (the vertical direction in FIG. 8) during the opening operation. The guided member 52 and the blocking wall 51b constitute blocking promoting means for urging blocking of an arc generated between the fixed electrode 15 and the movable electrode 18 when the circuit is opened.
[0034]
As shown in FIG. 2, the distance between the outer slit wall 53 and the central slit wall 54 is slightly larger than the thickness of the contact blades 18a and 18b. Further, the shaft 34 of the support base 31 is inserted into the insertion holes 44 of the both shaft attaching portions 43, and the movable arc extinguishing chamber 32 is rotatable about the shaft 34. Therefore, when the operation handle (not shown) is operated, the movable arc extinguishing chamber 32 is shown in FIG. 7 via the link mechanism (not shown), the rotating shaft 19, the lever 20, the operating link 22, and the operating pin 45. It moves between the loading corresponding position C and the opening corresponding position D shown in FIG.
[0035]
The radius of curvature of the inner surface of the first accommodating portion 41, that is, the inner surface of the first arc surface 41a is such that when the movable arc extinguishing chamber 32 moves from the loading corresponding position C to the opening corresponding position D, the restricting member 35 It is set as the grade which does not contact the inner surface of the 1st accommodating part 41. FIG. Further, the radius of curvature of the inner surface of the second accommodating portion 42, that is, the guided surface 42 b is approximately the same as the radius of curvature of the arc portion of the guide member 39, and the movable arc extinguishing chamber 32 is moved from the loading corresponding position C. When moving to the opening corresponding position D, the tip of the fixed electrode 15 is set so as not to contact the inner surface of the second housing portion 42.
(Operation of the embodiment)
Next, the operation at the time of opening of the switch 11 configured as described above will be described with reference to FIGS.
[0036]
In the closing state shown in FIG. 7, when the operation handle (not shown) is operated to open, the lever 20 rotates to the left via the rotation shaft 19. Along with this, the drive link 21 is moved downward, and the movable electrode 18 rotates left about the shaft 17. When the movable electrode 18 is separated from the fixed electrode 15, an arc is generated between the electrodes 15 and 18.
[0037]
On the other hand, as the lever 20 rotates to the left, the operation link 22 is moved downward. Then, the movable arc-extinguishing chamber 32 is moved downward via the operating pin 45 and rotates right about the shaft 34. That is, the movable arc-extinguishing chamber 32 follows the left rotation of the movable electrode 18 and moves in a direction that includes an arc stretching direction component or a direction that substantially coincides with the arc stretching direction. As the movable electrode 18 rotates to the left, the guide member 39 of the support base 31 relatively enters between the contact blades 18a and 18b. Therefore, the contact blades 18a, 18b are sandwiched between the side walls 51a, 51a and the side walls of the guide member 39, and the arc generated between the electrodes 15, 18 is stretched while being extinguished by the slits.
[0038]
As shown in FIG. 8, when the lever 20 is further rotated leftward, the movable arc-extinguishing chamber 32 rotates rightward while the guided surface 42 b of the guided member 52 is guided by the arc portion of the guide member 39. To do. Along with this, the guided member 52 enters between the electrodes 15 and 18, that is, the arc generating portion so as to block the arc. Further, the central slit wall 54 enters between the contact blades 18a and 18b in place of the guide member 39. For this reason, the contact blades 18a and 18b are sandwiched between the outer slit wall 53 and the central slit wall 54, respectively, and the arc generated between the electrodes 15 and 18 is further stretched while being slit extinguished. And arc extinguished.
[0039]
When the two contact blades 18a and 18b of the movable electrode 18 pass between the outer slit wall 53 and the central slit wall 54, the guided member 52 is connected to the arc generating portion of the fixed electrode 15 and the movable electrode 18. It moves so as to block the line segment connecting the arc generation part of the line with a straight line. For this reason, as shown by a chain line in FIG. 9, the arc path is bent so as to bypass the guided member 52, and the arc path, that is, the extension distance of the arc becomes larger than that of a straight line. The bending degree of the arc path increases as the movable arc-extinguishing chamber 32 rotates to the right.
[0040]
When the movable electrode 18 moves to the open position B shown in FIG. 9, the arc is completely extinguished and the circuit opening operation ends. At this time, the arc path is bent to such an extent that the insulation distance between the electrodes 15 and 18 is sufficiently secured, as shown by the chain line in FIG. That is, after completion of the circuit opening, the guided member 52 functions as an in-phase insulation barrier, and the dielectric strength between the electrodes 15 and 18 is improved. For this reason, the distance between the electrodes 15 and 18 can be shortened.
[0041]
Further, at the time of opening the circuit, the common part of the movement trajectory of the movable arc-extinguishing chamber 32 and the movement trajectory of the movable electrode 18 becomes a space for arc extinction of the arc. The position of the inner surface of the slit arc extinguishing portion 55 in contact is sequentially displaced from the left side to the right side in FIG. 8 to suppress partial wear.
[0042]
Further, as the movable arc-extinguishing chamber 32 rotates, the air in the air-blowing chamber 42 c is moved by the movement of the closing wall 51 b of the air-blowing chamber 42 c provided in the movable arc-extinguishing chamber 32. The arc is blown to the arc generated between the two and the arc, and the arc is extended and diffused in the air blowing chamber 42c toward the opening 42d side. For this reason, the arc extinguishing action at the slit arc extinguishing portion 55 is promoted.
[0043]
In addition, the decomposition gas containing carbide or the like generated at the time of arc generation is quickly discharged from the movable arc-extinguishing chamber 32 through the opening 42d in the opposite direction to the movable electrode 18, and the inside of the movable arc-extinguishing chamber 32 and the movable electrode 18 are discharged. The cracked gas does not exist in the vicinity. Although the decomposition gas is released toward the inner wall of the main body case 12 on the power supply side bushing 13 side, it is blocked by the ground barrier V and does not contact the inner wall of the main body case 12.
[0044]
When the circuit is closed, the common part of the movement locus of the movable arc extinguishing chamber 32 and the movement locus of the movable electrode 18 becomes an arc extension space. When the circuit is closed, an operation opposite to that of the above-described circuit is performed.
[0045]
Therefore, according to the present embodiment, the following effects can be obtained.
(1) The movable arc-extinguishing chamber 32 is configured to be movable in a direction including an arc stretching direction component so as to follow in synchronization with the stretching of the arc. For this reason, the movable arc-extinguishing chamber 32 moves so as to wrap the arc, and the movable arc-extinguishing chamber 32 is interposed between the fixed electrode 15 and the movable electrode 18. Therefore, the arc can be efficiently confined in the movable arc extinguishing chamber 32. Further, the movable arc-extinguishing chamber 32 functions as an insulating barrier between the electrodes 15 and 18, and the distance between the electrodes 15 and 18 can be shortened. As a result, the length of the switch 11 in the in-phase direction can be shortened.
[0046]
(2) Since the blower chamber 42c is provided in the movable arc-extinguishing chamber 32, the arc is extended and diffused in the blower chamber 42c toward the opening 42d. Accordingly, it is possible to increase the arc extinguishing ability by providing a further cooling effect. In addition, the decomposition gas containing carbide or the like generated when the arc is generated is quickly discharged from the movable arc-extinguishing chamber 32 through the opening 42d in the direction opposite to the movable electrode 18, and the movable arc-extinguishing chamber 32 and the movable electrode By preventing the cracked gas from being present around 18, re-ignition can be prevented.
[0047]
(3) In the movable arc-extinguishing chamber 32, the guided member 52 that enters the arc generation site so as to block the arc generated between the electrodes 15 and 18 as the movable arc-extinguishing chamber 32 rotates when the circuit is opened. Formed. For this reason, the arc path becomes long due to the insulating barrier effect of the guided member 52. Therefore, although the distance between the electrodes 15 and 18 can be shortened despite the simple configuration, a sufficient insulation distance can be secured.
[0048]
(4) The common part of the movement trajectory of the movable arc extinguishing chamber 32 and the movement trajectory of the movable electrode 18 is a space for extending an arc generated between the electrodes 15 and 18 when the circuit is opened. For this reason, unlike the case where the arc-extinguishing chamber is fixed as in the prior art, it is not necessary to form the movable arc-extinguishing chamber 32 along the rotation trajectory of the movable electrode 18. Therefore, the entire movable arc extinguishing chamber 32 can be reduced in size.
[0049]
(5) Each part of the movable arc extinguishing chamber 32, that is, the shaft attachment part 43, the arc extinguishing part, and the guided member 52 are integrally formed of a synthetic resin having insulation properties. For this reason, the movable arc extinguishing chamber 32 can be easily formed by injection molding or the like, and the manufacturing efficiency can be improved.
[0050]
(6) A central slit wall 54 is formed in the movable arc extinguishing chamber 32, and a guide member 39 is formed in the support base 31, and when the circuit is opened, the central slit wall 54 and the guide member 39 are both movable contact blades 18a, 18b. I tried to enter in between. For this reason, the contact blades 18a and 18b are continuously sandwiched between the both side walls of the guide member 39 and the outer slit wall 53, and the central slit wall 54 and the outer slit wall 53, respectively. Therefore, the arc extinguishing capability of the movable arc extinguishing chamber 32 is improved, and the arc generated between the electrodes 15 and 18 is effectively extinguished by the slit.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment differs from the first embodiment in that the movable electrode 18 is configured to be capable of reciprocating linear movement. Therefore, the same reference numerals are given to the same member configurations as those in the first embodiment, and the duplicate description thereof is omitted.
[0051]
As shown in FIG. 12, one end of a drive link 71 is connected to the rotary shaft 19 so as to be integrally rotatable. A first long hole 72 is formed at the other end of the drive link 71 along the axis of the drive link 71. A connecting shaft 73 that connects the contact blades 18a and 18b is inserted through the first elongated hole 72. The connecting shaft 73 is movable relative to the drive link 71 between the upper end and the lower end of the first long hole 72.
[0052]
A straight second elongated hole 74 is formed at the base end of both contact blades 18a, 18b of the movable electrode 18. The shaft 17 is inserted into the second long hole 74, and the coaxial 17 is movable between the right end and the left end of the second long hole 74 relative to the contact blades 18 a and 18 b. . The movable arc-extinguishing chamber 32 is configured so that the guided member 52 and the movable electrode 18 do not interfere during the opening operation.
[0053]
Now, in the closing state shown in FIG. 10, when the operation handle (not shown) is operated to open, the drive link 71 rotates left about the rotation shaft 19. Then, the connecting shaft 73 moves relative to the drive link 71 from the upper end to the lower end of the first long hole 72 and moves to the right in FIG. As a result, both the contact blades 18a and 18b are also moved in the right direction in FIG. 10, and accordingly, the shaft 17 is moved relative to the both contact blades 18a and 18b from the right end to the left end of the second long hole 74. . When the movable electrode 18 is separated from the fixed electrode 15, an arc is generated between the electrodes 15 and 18.
[0054]
On the other hand, as in the first embodiment, the movable arc extinguishing chamber 32 follows the movement of the movable electrode 18 in the right direction and enters between the electrodes 15 and 18 in accordance with the opening operation of the operation handle. To the right about the shaft 34. When the arc generated between the electrodes 15 and 18 passes between the outer slit wall 53 and the central slit wall 54, the arc is extinguished. Then, when the movable electrode 18 moves to the open position B shown in FIG. 11, the opening operation is finished.
[0055]
At this time, as shown in FIG. 11, the connecting shaft 73 is engaged with the lower end of the first long hole 72, and the shaft 17 is engaged with the left end of the second long hole 74. Further, the movable arc-extinguishing chamber 32 is in the open corresponding position D shown in FIG. 13, and the guided member 52 of the movable arc-extinguishing chamber 32 is interposed between the fixed electrode 15 and the movable electrode 18. For this reason, the dielectric strength between the electrodes 15 and 18 is improved by the barrier effect of the guided member 52.
[0056]
Therefore, according to the present embodiment, the guided member 52 of the movable arc-extinguishing chamber 32 is located between the electrodes 15 and 18 in the open circuit state as in the first embodiment. For this reason, the dielectric strength between the electrodes 15 and 18 is improved by the barrier effect of the guided member 52. Therefore, even in the switch 11 in which the movement locus of the movable electrode 18 is linear, the distance between the electrodes 15 and 18 can be shortened.
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is different from the first embodiment in that the movable electrode 18 is composed of a single contact blade. Therefore, the same reference numerals are given to the same member configurations as those in the first embodiment, and the duplicate description thereof is omitted.
[0057]
As shown in FIGS. 12 and 13, the movable electrode 18 is composed of a single movable contact blade 81, and the movable contact blade 81 is supported so as to be rotatable about a shaft 17. Further, a conductive rod 82 projects from the inner end of the power supply side bushing 13, and a fixed electrode 83 is fixed to the conductive rod 82. The fixed electrode 83 is composed of a pair of fixed contact blades 83a and 83b, and the movable contact blade 81 can be clamped by the fixed contact blades 83a and 83b.
[0058]
As shown in FIG. 14, a pair of outer slit walls 84 are formed on the load-side bushing 14 side of the movable arc-extinguishing chamber 32 provided at the inner end of the power-source-side bushing 13. The distance between 84 is slightly larger than the thickness of the movable contact blade 81. As shown in FIG. 15, in the support base 31 fixed to the inner end of the power supply side bushing 13, a pair of fan-shaped guide members 85 project from the lower portion of the insertion guide member 37. The distance between the two guide members 85 is slightly larger than the thickness of the movable contact blade 81. The movable contact blade 81 can pass between the outer slit wall portions 84 and between the guide members 85.
[0059]
Therefore, according to the present embodiment, the guided member 52 of the movable arc-extinguishing chamber 32 is located between the electrodes 83 and 18 in the open circuit state, as in the first embodiment. For this reason, the dielectric strength between the electrodes 83 and 18 is improved by the barrier effect of the guided member 52. Therefore, even in the switch 11 including the movable electrode composed of the single movable contact blade 81 and the fixed electrode 83 composed of the pair of fixed contact blades 82a and 82b, the distance between the electrodes 83 and 18 is also included. And the length of the switch 11 in the in-phase direction can be shortened.
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
[0060]
As shown in FIGS. 16 and 17, a plurality of grooves 88 and 89 are formed on the inner surface of the movable arc extinguishing chamber 32 and the both side surfaces of the guide member 39 so as to be orthogonal to or intersect with the movement locus of the movable electrode 18, respectively. Extending in parallel. That is, the inner surface of the movable arc extinguishing chamber 32 (the inner surfaces of the first and second accommodating portions 41 and 42, the inner surfaces of the outer slit walls 53 and 53, and the outer slit walls 53 and 53 of the central slit wall 54). The grooves 88 are formed so as to be parallel to the blocking wall 51b on the opposing surfaces and the fixed electrode 15 side surface of the central slit wall 54). Further, the grooves 89 are formed on both side surfaces of the guide member 39 so as to be orthogonal to the regulating member 35. The grooves 88 and 89 are creeping distance increasing means for increasing the creeping distance between the electrodes 18 and 15, and continuous adhesion preventing means for preventing the product from continuously adhering to the inner surface of the arc extinguishing chamber 32. Configure.
[0061]
Now, when opened, gaseous products such as arc extinguishing gas, carbide and metal vapor are generated by the heat of the arc generated between the electrodes 15 and 18. This product adheres to the inner surface of the movable arc-extinguishing chamber 32, both side surfaces of the guide member 39, and the grooves 88 and 89 so as to follow the rotational trajectory of the movable electrode 18. That is, since the product is dispersed and adhered in the grooves 88 and 89, the product does not continuously adhere to the inner surface of the movable arc extinguishing chamber 32 and both side surfaces of the guide member 39, and the continuous fouling surface. Is not formed.
[0062]
A decrease in creeping insulation resistance due to the product adhering to the inner surface of the movable arc extinguishing chamber 32 and both side surfaces of the guide member 39 is compensated by increasing the creeping distance by the grooves 88 and 89. Even when the movable electrode 18 is opened while the inner surface of the movable arc-extinguishing chamber 32 and both side surfaces of the guide member 39 are soiled by the product, the inner surface of the movable arc-extinguishing chamber 32 and the both side surfaces of the guide member 39 are removed. Thus, no current is passed between the electrodes 15 and 18. That is, the insulation performance between the same phases in the switch 11 is improved. Therefore, according to the present embodiment, the dielectric strength of the inner surface of the movable arc extinguishing chamber 32 and the both side surfaces of the guide member 39 is maintained, and the withstand voltage characteristics can be satisfactorily maintained for a long time.
[0063]
The above embodiments may be modified as follows.
-You may abbreviate | omit the guide members 39 and 85 in the said 2nd and 3rd embodiment. Even in this case, the movable electrode 18 is sandwiched between the outer slit wall 53 and the central slit wall 54, and the arc generated between the electrodes 15 and 18 can be extinguished.
[0064]
  Next, technical ideas other than the claimed invention that can be grasped from the embodiment will be described below together with their effects.
  The fixed electrode (15) is rod-shaped, and the movable electrode (18) is composed of a pair of plate-shaped movable contact blades (18a, 18b), and both the movable contact blades (18a, 18b) are fixed electrodes (15). Is inserted into the arc extinguishing chamber (32) so as to enter between the movable contactors (18a, 18b) when the circuit is opened, and a pinching member for arc extinguishing the slit as a slit ( 54).3~ Claim7An arc extinguishing device for a switch according to any one of the above. Even in this case, the arc extinguishing ability can be improved.
[0065]
  A fixed sandwiching member (39) that cooperates with the sandwiching member (54) and enters between the movable contact blades (18a, 18b) at the time of opening to extinguish the arc as a fixed electrode (15) Claims provided on the side4An arc extinguishing device for a switch according to claim 1. Even in this case, the arc extinguishing ability can be improved.
[0066]
【The invention's effect】
  Therefore, according to the first aspect of the present invention, the arc extinguishing chamber is interposed between the fixed electrode and the movable electrode, and the distance between the two electrodes is shortened by increasing the flashing distance between the two electrodes. can do.In addition, the arc extinguishing capability is improved by opening the arc extinguishing chamber to promote the interruption of the arc path.
[0068]
  Claim2According to the invention described in (1), the distance between the two electrodes can be further shortened by providing the partition member.
  Claim2 or claim 3According to the invention described inThe shaft attachment part, the arc extinguishing part, and the partition member are integrally formed.With the configuration in which the arc extinguishing chamber is rotatably provided, the distance between the two electrodes can be shortened.
[0069]
  Claim 4According to the invention described inClaim 3In addition to the effects of the described invention, the arc extinguishing ability of the arc can be improved.
[0071]
  Claim6In the invention described in claim 1,5In addition to the effects of the invention described in (1), the product generated along with the generation of the arc does not continuously adhere to the inner surface of the arc extinguishing chamber, and the decrease in the insulation resistance along the surface can be mitigated.
[0072]
  Claim7In the invention described in claim 1,6In addition to the effects of the invention described in (1), the withstand voltage between both electrodes can be improved despite the simple configuration.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a switch according to an embodiment.
FIG. 2 is a plan view of a main part of a switch according to the present embodiment.
FIG. 3 is a perspective view showing attachment of a movable arc extinguishing member in the present embodiment.
FIG. 4 is a perspective view of a movable arc extinguishing member in the present embodiment.
FIG. 5 is a perspective view of a movable arc extinguishing member in the present embodiment.
FIG. 6 is a right side view of the movable arc extinguishing member in the present embodiment.
FIG. 7 is a front view of a main part of a switch according to the present embodiment.
FIG. 8 is a front view of a main part of a switch according to the present embodiment.
FIG. 9 is a front view of a main part of a switch according to the present embodiment.
FIG. 10 is a front view of an essential part of a switch according to another embodiment.
FIG. 11 is a front view of an essential part of a switch according to another embodiment.
FIG. 12 is a front view of a main part of a switch according to another embodiment.
FIG. 13 is a side sectional view of an essential part of an electrode part in another embodiment.
FIG. 14 is a side view of a movable arc-extinguishing member according to another embodiment.
FIG. 15 is a side view of a support base in another embodiment.
FIG. 16 is a perspective view of a movable arc-extinguishing member according to another embodiment.
FIG. 17 is a front view of an essential part of a switch according to another embodiment.
FIG. 18 is a front sectional view of a conventional switch.
[Explanation of symbols]
11 ... switch, 12 ... main body case, 13 ... power supply side bushing,
14 ... load side bushing, 15 ... fixed electrode, 18 ... movable electrode,
18a, 18b, 81 ... movable contact blade, 20 ... lever, 21 ... drive link,
22 ... Actuation link, 23 ... Opening / closing mechanism part, 30 ... Arc-extinguishing member, 31 ... Support stand,
32 ... movable arc-extinguishing chamber (arc-extinguishing chamber), 34 ... shaft, 39, 85 ... guide member (fixed clamping member), 43 ... shaft attachment portion, 52 ... guided member (partition wall member),
53, 84 ... outer slit wall, 54 ... central slit wall (insertion member), 55 ... arc extinguishing part,
83a, 83b ... fixed contact blades,
88, 89 ... grooves constituting creeping distance increasing means and continuous adhesion preventing means.

Claims (7)

The movable electrode (18) is separated from the fixed electrode (15), and the extinguishing of the switch (11) that extinguishes the arc generated and stretched between the electrodes (15, 18) in the arc extinguishing chamber (32). In the arc method,
A shaft attachment part (43) pivotally attached to the fixed electrode (15) side, an arc extinguishing part (55) that extinguishes the arc as the movable electrode (18) rotates, and an open circuit A partition member (52) that enters an arc generation site with the movement of the arc and extends the arc, and the arc extinguishing chamber (32) in which these are integrally formed is linked to an external operation, and the movable electrode ( 18) An open / close mechanism (23) for transmitting an open / close operation to the open / close mechanism is operatively connected to the open / close mechanism via an operating link (22) and rotated in the direction opposite to the rotational direction of the movable electrode (18) in conjunction with an external operation. The arc extinguishing part (55) of the arc extinguishing chamber (32) follows the movable electrode (18) synchronously when the circuit is opened, and the direction of stretching of the arc generated between the electrodes (15, 18) is configured. By moving in the direction including the component, the arc is not extinguished by the slit. When the movable electrode (18) and the arc extinguishing chamber (32) are further rotated, the partition wall member (52) enters the arc generation site to increase the arc extension distance. How to extinguish arcing switches. A pair of bushings (13, 14) penetrating and supported on both side walls of the body case (12) so as to face each phase;
A fixed electrode (15) provided at the inner end of one bushing (13);
A movable electrode (18) rotatably provided at the inner end of the other bushing (14) and corresponding to the fixed electrode (15);
It is provided at the inner end of the one bushing (13) so as to cover the fixed electrode (15). When the movable electrode (18) is separated from the fixed electrode (15), it is generated between both electrodes (15, 18). In a switch (11) having an arc extinguishing chamber (32) for extinguishing an arc to be
The arc extinguishing chamber (32) includes a shaft attachment part (43) that is pivotally attached to the fixed electrode (15) side, and an arc extinguishing part that arc-extinguishes the slit as the movable electrode (18) rotates. An arc part (55) and a partition member (52) that enters the arc generation part and moves the arc along with the movement at the time of opening the circuit, and these are integrally formed,
The arc extinguishing chamber (32) is operatively connected to the opening / closing mechanism (23) via an operating link (22) and rotated in the direction opposite to the rotational direction of the movable electrode (18) in conjunction with an external operation. A switch that can be operated dynamically. A pair of bushings (13, 14) penetrating and supported on both side walls of the body case (12) so as to face each phase;
A fixed electrode (15) provided at the inner end of one bushing (13);
A movable electrode (18) rotatably provided at the inner end of the other bushing (14) and corresponding to the fixed electrode (15);
In conjunction with an external operation, provided in a switch (11) provided with an open / close mechanism (23) that transmits an open / close operation to the movable electrode (18),
In the arc extinguishing device (30) of the switch (11) for extinguishing the arc generated between the electrodes (15, 18) when the movable electrode (18) is separated from the fixed electrode (15),
The arc extinguishing device (30) includes an arc extinguishing chamber (32) provided so as to be rotatable about a shaft (34) provided in one bushing (13),
The arc-extinguishing chamber (32) includes a shaft-attached part (43) that is pivotally mounted on the fixed electrode (15) side, and an arc-extinguishing unit that arc-extinguishes the slit as the movable electrode (18) rotates. An arc part (55) and a partition member (52) that enters the arc generation part and moves the arc along with the movement at the time of opening the circuit, and these are integrally formed,
The arc extinguishing chamber (32) is operatively connected to the opening / closing mechanism (23) via an operating link (22) and rotated in the direction opposite to the rotational direction of the movable electrode (18) in conjunction with an external operation. An arc extinguishing device for a switch that can be operated dynamically. The arc-extinguishing chamber (32) moves with the movement of the arc-extinguishing chamber (32), and this movement causes the air in the arc-extinguishing chamber (32) to move between the fixed electrode (15) and the movable electrode when the circuit is opened. (1 The arc extinguishing device for a switch according to claim 3, further comprising a blower member (51b) for extruding the arc generated between the first and second arcs. A creeping distance increasing means for increasing the creeping distance between the movable electrode (18) and the fixed electrode (15) at a portion facing the locus when the movable electrode (18) is opened and closed in the arc extinguishing chamber (32). The arc-extinguishing apparatus according to claim 3 or claim 4, wherein The arc extinguishing apparatus according to claim 5, wherein the creeping distance increasing means is a continuous adhesion preventing means for preventing a product generated together with the arc from continuously adhering to the inner surface of the arc extinguishing chamber (32) when the circuit is opened. . The arc extinguishing apparatus according to claim 6, wherein the creeping distance increasing means is a plurality of grooves (88) formed so as to extend in a crossing direction with respect to a movement locus of the movable electrode (18).

Images