JP2018163797A - Switch with fuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch with fuse capable of suppressing reduction of arc-extinguishing performance even in the case where molding of an arc-extinguishing device is adverse.SOLUTION: A switch with fuse comprises: a stationary electrode support part 12 to which a stationary electrode is attached; and an arc-extinguishing device 60 for extinguishing an arc that is generated when releasing a movable electrode 20 from the stationary electrode. In a distal end of the stationary electrode support part 12, a stationary electrode housing part 36 which is formed in a bottomed cylindrical shape for housing the stationary electrode therein and including an opening at a side where the movable electrode 20 is inserted is provided. The arc-extinguishing device 60 includes: an attachment part 61 which covers an outer periphery of the stationary electrode housing part 36 and is attached to the stationary electrode housing part 36; a slit part 62 which is provided continuously to the attachment part 61 and extinguishes the arc; and an opening 63 into which the movable electrode 20 is inserted.SELECTED DRAWING: Figure 21

Description

  The present invention relates to a fuse-equipped switch that opens and closes a circuit by moving a movable electrode to and from a fixed electrode.

  The fuse-equipped switch includes a fixed electrode and a movable electrode that is energized by being brought into contact with the fixed electrode. The movable electrode is connected to the current limiting fuse and is rotatably supported. The fuse-equipped switch contacts the movable electrode with the fixed electrode by rotating the movable electrode in the closing direction, and separates the movable electrode from the fixed electrode by rotating the movable electrode in the opening direction. Thereby, a switch with a fuse opens and closes a circuit (for example, refer to patent documents 1).

  The switch with a fuse described in Patent Document 1 includes an arc extinguishing device that extinguishes an arc generated between a fixed electrode and a movable electrode. The fuse-equipped switch includes a fixed electrode support insulator on which the fixed electrode is supported. The arc extinguishing device has a locking projection locked in an engagement hole provided in the fixed electrode support insulator, and is screwed to the fixed electrode support insulator together with a power supply side terminal connected to the fixed electrode.

Japanese Utility Model Publication 1-29-1960

  By the way, in the switch with fuse described in Patent Document 1, when the arc extinguishing device is poorly formed, a gap is formed between the lower surface of the arc extinguishing device and the upper surface of the fixed electrode supporting insulator, and the arc There is a risk that the arc-extinguishing gas generated in the above will escape from the gap. When the arc extinguishing gas is released, the arc extinguishing performance is deteriorated.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a switch with a fuse that can suppress a decrease in arc extinguishing performance even if the arc extinguishing device is poorly molded. is there.

  A fuse-equipped switch that solves the above-mentioned problems is a fuse-equipped switch having a fixed electrode and a movable electrode that is provided so as to be able to contact and separate from the fixed electrode, and a fixed electrode support portion to which the fixed electrode is attached; An arc extinguishing device that extinguishes an arc generated when the movable electrode is released from the fixed electrode, and a tip of the fixed electrode support portion has a bottomed cylindrical shape that accommodates the fixed electrode; A fixed electrode housing portion having an opening on the side where the movable electrode is inserted, and the arc extinguishing device covers an outer periphery of the housing portion and is attached to the fixed electrode housing portion; A slit portion that is continuously provided in the portion and extinguishes the arc, and an opening portion into which the movable electrode is inserted.

  According to the above configuration, since the fixed electrode is surrounded by the bottomed cylindrical fixed electrode housing portion and the outer periphery of the fixed electrode housing portion is covered by the mounting portion, even if the arc extinguishing device is poorly molded, Occurrence of the arc-extinguishing gas can be suppressed by the double wall of the fixed electrode housing portion and the attachment portion. Therefore, even if the arc-extinguishing device is poorly formed, it is possible to suppress the deterioration of the arc-extinguishing performance.

In the above-mentioned switch with fuse, it is preferable that a locking projection is provided outside the fixed electrode housing portion, and a locking hole that locks the locking projection is provided in the mounting portion.
According to the said structure, an arc-extinguishing apparatus can be attached to a fixed electrode support part because the latching hole of the attaching part of an arc-extinguishing apparatus latches to the latching protrusion of a fixed electrode accommodating part.

About the said switch with a fuse, it is preferable that the recessed part fitted to the downward convex part of the said fixed electrode is provided in the bottom part inside the said fixed electrode accommodating part.
According to the said structure, when accommodating a fixed electrode in a fixed electrode accommodating part, it can position by fitting the downward convex part of a fixed electrode to the recessed part of a fixed electrode accommodating part.

  In the switch with fuse, a fixed electrode fixing portion for fixing the fixed electrode by a plate-like nut and a screw is provided at a tip of the fixed electrode housing portion, and the plate-like nut is provided in the fixed electrode fixing portion. It is preferable that a drop suppressing portion for suppressing the falling of the is provided.

  According to the above configuration, when the fixed electrode is fixed to the fixed electrode support portion, the fixed electrode is fixed to the fixed support portion by placing the plate-like nut on the drop suppressing portion provided in the fixed electrode fixing portion and tightening the screw. Can be fixed.

  According to the present invention, even if the arc extinguishing device is poorly molded, it is possible to suppress a decrease in arc extinguishing performance.

The perspective view seen from the upper right which shows schematic structure of the switch with a fuse. The front view which shows schematic structure of the switch with a fuse. The bottom view which shows schematic structure of a switch with a fuse. The right view which shows schematic structure of a switch with a fuse. The left view which shows schematic structure of a switch with a fuse. The bottom view which shows the structure of the switching mechanism of a switch with a fuse. The perspective view seen from the lower left which shows schematic structure of a switch with a fuse. The rear view which shows schematic structure of a switch with a fuse. The rear side perspective view which shows the structure of the operation mechanism of a switch with a fuse. The rear side perspective view which shows the structure of the operation mechanism of a switch with a fuse. The rear side perspective view which shows the structure of the operation mechanism of a switch with a fuse. The right view which shows the structure of the fuse support part of a switch with a fuse. The perspective view seen from the lower left which shows the structure in the open state of a switch with a fuse. The front view which shows the structure of the lower end part of the fuse support part of a switch with a fuse. The right view which shows the structure of the lower end part of the fuse support part of a switch with a fuse. The perspective view seen from the upper left which shows the structure of the fixed electrode of a switch with a fuse, and a movable electrode. The front view which shows the structure of the fixed electrode of a switch with a fuse. The rear view which shows the structure of the fixed electrode of a switch with a fuse, and a power supply side connection terminal. The front view which shows the structure of the stationary electrode accommodating part of a switch with a fuse. The top view which shows the structure of the fixed electrode fixing | fixed part of a switch with a fuse. The perspective view seen from the upper left which shows the structure of the arc-extinguishing apparatus of a switch with a fuse. The front view which shows the structure of the latch mechanism of a switch with a fuse. The perspective view seen from the upper left which shows the structure of the trip mechanism of a switch with a fuse. The front view which shows schematic structure of the operation | movement detection apparatus of a switch with a fuse. The rear view which shows schematic structure of the operation | movement detection apparatus of a switch with a fuse. The perspective view seen from the upper right which shows the structure of the 1st operation | movement detection apparatus in the injection | throwing-in state of the switch with a fuse. The perspective view seen from the upper right which shows the structure of the 1st operation | movement detection apparatus in the open state of a switch with a fuse. The perspective view seen from the upper right which shows the structure of the 2nd operation | movement detection apparatus in the injection | throwing-in state of the switch with a fuse. The perspective view seen from the upper right which shows the structure of the 2nd operation | movement detection apparatus in the open state of a switch with a fuse.

One embodiment of a fuse-equipped switch will be described with reference to FIGS. Hereinafter, “switch with fuse” is abbreviated as “switch”.
As shown in FIGS. 1 to 3, the switch 1 is attached to a vertical plate or the like in a switchboard (not shown) by fixing plates 102 and 103. In the state shown in FIG. 2, the switch 1 is provided with the mounting base 101 extending in the left-right direction. The switch 1 includes a fixed electrode 34 that is positioned above the mounting base 101 and a movable electrode 20 that is in contact with and away from the fixed electrode 34. The movable electrode 20 is provided such that the center line L1 of the movable electrode 20 and the center line L2 of the fixed electrode 34 are on the same line (see FIG. 2). The center line L1 is a straight line that passes through the center of the width of the movable electrode 20 in the left-right direction. The center line L2 is a straight line passing through the center of the width of the fixed electrode 34 in the left-right direction. The fixed electrode 34 and the movable electrode 20 are provided corresponding to each of the three phases. Insulation barriers 110 are installed on the mounting base 101 via mounting brackets 111 between the phases and at both ends. An operation handle 2 for operating the movable electrode 20 is provided at the right end of the mounting base 101.

  As shown in FIGS. 4 and 5, the switch 1 includes a mounting base 101 that is bent into a U-shaped cross section. The U-shape of the mounting base 101 includes a first side surface portion 101A located on the upper side, a second side surface portion 101B provided in parallel with the first side surface portion 101A, a first side surface portion 101A, and a second side surface portion 101B. The third side surface portion 101C is connected. The surface of the third side surface portion 101C is a flat surface. A pair of left-side fixing plate 102 and right-side fixing plate 103 having an L-shaped cross section are fixed to the left and right sides of mounting base 101 (see FIG. 3).

  A support insulator 10 is fixed to the third side surface portion 101 </ b> C of the mounting base 101 for each phase. The support insulator 10 includes a base portion 11 fixed to the third side surface portion 101C of the attachment base 101, a fixed electrode support portion 12 to which the fixed electrode 34 is attached, and a fuse support portion to which the current limiting fuse and the movable electrode 20 are attached. 13 is formed integrally. The fixed electrode support portion 12 extends upward from the base portion 11. The fuse support portion 13 includes a base support portion 14 that extends downward and forward from the base portion 11 and a fuse support base 15 that branches and extends upward and downward and downward and rearward. A base support portion 14 is connected to the central portion 16 of the fuse support base 15. The lower end 18 of the fuse support 15 is positioned closer to the mounting base 101 than the upper end 17 of the fuse support 15. An upper fuse gripping bracket 40 is fixed to the upper end portion 17 of the fuse support 15 by screws 43 and plate nuts 44. A lower fuse gripping metal fitting 50 is fixed to the lower end portion 18 of the fuse support base 15 with a screw 53 and a plate-like nut 54. The upper fuse gripping bracket 40 includes a gripping holder 41 that grips the upper portion of the current limiting fuse and a presser bracket 42 that presses the gripping holder 41. The lower fuse holding metal fitting 50 includes a holding holder 51 that holds the lower part of the current limiting fuse and a holding metal fitting 52 that holds the holding holder 51. Connected to the lower fuse gripping metal 50 is a load side connection terminal 55 led out in the lower outer direction. The upper fuse gripping metal fitting 40 corresponds to the upper fuse gripping portion. The lower fuse holding metal fitting 50 corresponds to a lower fuse holding portion.

  The upper end of the driven lever 45 is rotatably supported on the upper end of the fuse support 15. An open phase opening mechanism is provided at the lower end of the driven lever 45. A current limiting fuse (not shown) is connected between the upper fuse holding metal fitting 40 and the lower fuse holding metal fitting 50. The current limiting fuse includes a fusing display device in which a display unit (not shown) projects when fusing. When the display unit of the fusing display device protrudes, the driven lever 45 is rotated, and the movable electrodes 20 of the respective phases are simultaneously opened through the open phase release mechanism.

  As shown in FIG. 2, the center line L3 of the fuse support portion 13 is displaced in the left-right direction from the center line L1 of the movable electrode 20 and the center line L2 of the fixed electrode 34. The center line L3 is a straight line passing through the center of the width of the fuse support portion 13 in the left-right direction.

  As shown in FIG. 7, the base portion 11 of the support insulator 10 has a fixing portion 11 </ b> A that is fixed to the mounting base 101. The fixing portion 11A is fixed to the third side surface portion 101C of the mounting base 101 by two sets of plate-like nuts 104 and screws 105. Nut accommodating portions 11B for accommodating the plate-like nuts 104 from the side are provided on the left and right sides of the fixing portion 11A. The plate-like nut 104 is positioned and stopped by being housed in the nut housing portion 11B. The screw 105 is inserted from the back side of the mounting base 101 and fastened to the plate nut 104. In FIG. 7, the insulating barrier 110 at the end is omitted so that the opening / closing mechanism can be seen.

  As shown in FIG. 8, a fixing plate 106 that reinforces the attachment base 101 is attached to the back surface of the attachment base 101, in other words, inside. The fixed plate 106 is a metal plate bent into an L shape. The fixing plate 106 is attached along the inner surface of the second side surface portion 101B and the inner surface of the third side surface portion 101C (see FIG. 10). The fixing plate 106 is fixed to the mounting base 101 together with the supporting lever 10 by a screw 105 that fixes the supporting lever 10 to the mounting base 101. The fixed plate 106 is provided with a notch 106A through which the push-up bar 30 is inserted. Two columnar projections 11C are provided on the surface of the fixing portion 11A facing the mounting base 101. The third side surface portion 101C of the mounting base 101 is provided with a through hole 101D into which the protrusion 11C is fitted. The fixing plate 106 is provided with a through hole 106B into which the protrusion 11C is fitted. The base part 11 of the support insulator 10 is positioned by fitting the protrusion 11C of the fixing part 11A into the through hole 101D of the third side face part 101C. The fixing plate 106 is positioned by fitting the projection 11C of the fixing portion 11A into the through hole 106B of the fixing plate 106.

  As shown in FIGS. 4 and 5, the movable electrode 20 is a single blade formed in a V shape by a single plate. The lower end 20A of the movable electrode 20 is rotatably supported by the protrusion 22 of the fuse support 15 by the first screw 21 and the nut 21A (see FIG. 6). The movable electrode 20 is provided so as to be able to contact and separate from the fixed electrode 34. A state where the movable electrode 20 is in contact with the fixed electrode 34 is referred to as a circuit input state, and a state where the movable electrode 20 is separated from the fixed electrode 34 is referred to as an open state of the circuit. 4 and 5, the insulating barrier 110 at the end is omitted so that the opening / closing mechanism can be seen.

  As shown in FIG. 6, the protrusion 22 of the fuse support 15 is provided at the center of the left side surface of the fuse support 15. A bearing fitting 24 that protects the projection 22, a conductive plate 27 connected to the upper fuse gripping fitting 40, and the movable electrode 20 are fastened to the projection 22 by a first screw 21 and a nut 21 </ b> A. The movable electrode 20 can be rotated with respect to the first screw 21.

  The bearing fitting 24 is a U-shaped member that covers the central portion 16 of the fuse support 15. The bearing bracket 24 includes a first side surface portion 24A sandwiched between the projection portion 22 and the movable electrode 20, a second side surface portion 24B facing the side surface opposite to the projection portion 22 of the fuse support portion 13, and a first side surface portion. 24A and the 2nd side part 24B are connected, and it has the fixing | fixed part 24C fixed to the fuse support part 13. As shown in FIG. The first screw 21 passes through the first side surface portion 24 </ b> A and the second side surface portion 24 </ b> B of the bearing bracket 24 together with the fuse support base 15. The fixing portion 24 </ b> C of the bearing metal 24 is fixed to the upper surface 15 </ b> A of the fuse support 15 by two second screws 25 different from the first screws 21.

  The fixing portion 24C of the bearing bracket 24 is provided with an opening restriction portion 24D that restricts the moving range of the movable electrode 20 when the movable electrode 20 moves in the opening direction away from the fixed electrode 34. The opening restricting portion 24D is a plate-like portion extending from the left end of the fixed portion 24C and extending to the rotation range of the movable electrode 20. As shown in FIG. 13, when the movable electrode 20 is opened, the opening restricting portion 24D comes into contact with the back surface of the movable electrode 20.

  The conductive plate 27 is a metal member that is L-shaped in section along the first side surface portion 24 </ b> A and the fixing portion 24 </ b> C of the bearing bracket 24 and extends to the upper fuse gripping bracket 40 along the fuse support base 15. The conductive plate 27 includes a sandwiching portion 27A sandwiched between the first side surface portion 24A and the movable electrode 20, a mounting portion 27B attached to the upper fuse gripping bracket 40, and a connecting portion 27C that connects the sandwiching portion 27A and the mounting portion 27B. And have. The conductive plate 27 is fixed to the fuse support 15 by one of the two screws 25 that fix the bearing bracket 24 to the fuse support 15. The conductive plate 27 may be fixed to the fuse support 15 with the two second screws 25.

  The attachment portion 27 </ b> B of the conductive plate 27 is attached to the upper surface of the upper fuse holding metal fitting 40. On the back surface of the mounting portion 27B of the conductive plate 27, two protrusions 27D that are engaged with the upper fuse holding metal fitting 40 are provided. The protrusion 27 </ b> D protrudes toward the upper fuse gripping metal fitting 40 side of the mounting portion 27 </ b> B and is engaged with the lower end portion of the upper fuse gripping metal fitting 40. The protrusion 27D of the mounting portion 27B is engaged with the lower end portion of the grip holder 41 of the upper fuse gripping bracket 40, whereby the conductive plate 27 can be positioned in the vertical direction with respect to the upper fuse gripping bracket 40.

  As shown in FIG. 12, the second screw 25 is fastened to the fuse support 15 by a plate-like nut 26. That is, the fuse support base 15 is provided with two nut housing portions 16A for housing the plate-like nuts 26 from the right side surface without the projections 22. The plate-like nut 26 is positioned and stopped by being accommodated in the nut accommodating portion 16A. Therefore, after the plate-like nut 26 is accommodated in the nut accommodating portion 16 </ b> A of the fuse support base 15, the bearing fitting 24 is attached to the protrusion 22, whereby the opening of the nut accommodating portion 16 </ b> A becomes the second side surface portion 24 </ b> B of the bearing fitting 24. The plate-like nut 26 is confined by the cover.

  As shown in FIG. 6, the bearing member 24, the conductive plate 27, and the movable electrode 20 are attached to the protrusion 22 in this order from the protrusion 22 side of the fuse support 15. Then, the first screw 21 is inserted into the first side surface portion 24A of the bearing bracket 24, the sandwiching portion 27A of the conductive plate 27, and the lower end portion 20A of the movable electrode 20, and the first side surface portion 24A of the bearing bracket 24 and the conductive plate. The 27 holding portions 27A and the lower end portion 20A of the movable electrode 20 are fastened to the fuse support 15 with nuts 21A.

  As shown in FIG. 7, the movable electrode 20 is operated by the push-up bar 30. One end of the push-up bar 30 is pivotally attached to the central portion 20B of the movable electrode 20 so as to be rotatable. The push-up bar 30 is made of an insulating material such as synthetic resin. The mounting base 101 is provided with a through hole 101E through which the push-up bar 30 passes. The base 11 of the support insulator 10 is provided with a through hole 11D that substantially matches the through hole 101E of the mounting base 101. The push-up bar 30 is provided through the through hole 11D of the base portion 11 and the through hole 101E of the mounting base 101. The notch 106A of the fixing plate 106 is notched to match the through hole 11D of the base 11 and the through hole 101E of the mounting base 101 (see FIG. 8). The through hole 11D corresponds to the through hole.

  As shown in FIG. 8, an operation shaft 31 is installed between the left fixed plate 102 and the right fixed plate 103 so as to be rotatable. The operation shaft 31 is located below the attachment base 101. The operation shaft 31 and the push-up bar 30 are connected via a push-up bar connecting link 32. The push-up bar connecting link 32 is provided for each phase. One end of the push-up bar connecting link 32 is fixed to the operation shaft 31. The other end of the push-up bar connecting link 32 is pivotally attached to the other end of the push-up bar 30 so as to be rotatable. The operation handle 2 is fixed to the right end portion 31 </ b> A of the operation shaft 31. When the operation handle 2 is operated, the movable electrode 20 is rotated via the link mechanism including the push-up bar 30 and is brought into contact with and separated from the fixed electrode 34. Here, the link mechanism including the operation handle 2, the operation shaft 31, and the push-up bar 30 functions as an operation mechanism.

  As shown in FIG. 10, the fixed plate 106 includes an operation restricting portion 106 </ b> C that restricts the movement range of the push-up rod connecting link 32 when the push-up rod 30 moves in the opening direction in which the movable electrode 20 is separated from the fixed electrode 34. I have. The end located inside the second side surface portion 101B of the fixed plate 106 functions as an operation restricting portion 106C by the push-up rod connecting link 32 coming into contact when the push-up rod 30 opens the movable electrode 20. . When the push-up bar connecting link 32 comes into contact with the operation restricting portion 106C, the movement of the push-up bar connecting link 32 is restricted, and damage to the movable electrode 20, the push-up bar 30, and the like can be suppressed.

  As shown in FIG. 14, two protrusions 52 </ b> A are provided on the lower surface of the presser fitting 52 of the lower fuse gripping metal 50 so as to be sandwiched in the left-right direction of the fuse support 15. The interval between the protrusions 52 </ b> A substantially matches the width of the fuse support 15 in the left-right direction. When the lower fuse gripping metal fitting 50 is attached to the fuse support base 15, the lower fuse gripping metal fitting 50 can be positioned in the left-right direction of the fuse support base 15 by the protrusion 52A. On the lower surface of the load side connection terminal 55, two protrusions 55 </ b> A that are engaged with the lower end of the holding holder 51 of the lower fuse holding metal fitting 50 are provided. When the load side connection terminal 55 is attached to the lower fuse holding metal fitting 50, the load side connection terminal 55 can be positioned in the vertical direction of the lower fuse holding metal fitting 50 by the protrusion 55A.

  As shown in FIG. 15, the lower fuse gripping metal fitting 50 and the load side connection terminal 55 are fixed to the lower end portion 18 of the fuse support 15 by a screw 53 and a plate-like nut 54. The lower end portion 18 of the fuse support 15 is provided with a nut accommodating portion 18A that accommodates the plate nut 54 from the right side surface. The plate-shaped nut 54 is positioned and stopped by being accommodated in the nut accommodating portion 18A.

  As shown in FIGS. 16 and 17, a fixed electrode housing portion 36 that houses the fixed electrode 34 is provided at the tip of the fixed electrode support portion 12. The fixed electrode housing portion 36 has a bottomed cylindrical shape and has an opening on the side where the movable electrode 20 is inserted. A power supply side connection terminal 35 is connected to the fixed electrode 34. 16 and 17 are diagrams in which the arc extinguishing device 60 is omitted for explanation.

  As shown in FIG. 18, the fixed electrode 34 and the power supply side connection terminal 35 are welded by rivets. A lower protrusion 34A is formed by a rivet below the fixed electrode 34 to which the power supply side connection terminal 35 is welded. The power supply side connection terminal 35 is provided with a positioning through hole 35A.

  As shown in FIG. 19, a concave portion 36 </ b> A for fitting the lower convex portion 34 </ b> A of the fixed electrode 34 is provided at the bottom inside the fixed electrode housing portion 36. Locking protrusions 36 </ b> B are provided on both side surfaces of the fixed electrode housing portion 36.

  As shown in FIG. 20, a fixed electrode fixing portion 37 that fixes the fixed electrode 34 with a screw 38 and a plate-like nut 39 is provided at the tip of the fixed electrode housing portion 36. At the left end of the fixed electrode fixing portion 37, an interphase pressure-resistant wall 37B extending in the vertical direction is provided. The interphase pressure-resistant wall 37 </ b> B is provided with a drop suppression portion 37 </ b> C that suppresses the drop of the plate nut 39. The drop suppressing portion 37C extends in parallel with the fixed electrode fixing portion 37 from the interphase pressure-resistant wall 37B. The plate-like nut 39 is installed between the fixed electrode fixing part 37 and the drop suppressing part 37C and fastened by a screw 38.

  As shown in FIG. 19, the fixed electrode fixing portion 37 is provided with a protrusion 37 </ b> A for fitting the through hole 35 </ b> A of the power supply side connection terminal 35. The fixed electrode 34 has a lower convex portion 34A fitted into the concave portion 36A of the fixed electrode housing portion 36 and a projection 37A fitted into the through-hole 35A of the power supply side connection terminal 35 so that the fixed electrode housing portion 36 Thus, positioning can be performed in the vertical direction and the horizontal direction. The power supply side connection terminal 35 is fixed to the fixed electrode fixing portion 37 so that the fixed electrode 34 is installed in the fixed electrode housing portion 36.

  As shown in FIG. 21, the fixed electrode housing portion 36 is provided with an arc extinguishing device 60 that extinguishes an arc generated when the movable electrode 20 is released from the fixed electrode 34. The arc extinguishing device 60 is made of a synthetic resin that generates arc extinguishing gas by contact with the arc. The arc extinguishing device 60 has a rectangular tube shape and covers the outer periphery of the fixed electrode housing portion 36. The arc extinguishing device 60 is attached to the fixed electrode housing portion 36, the slit portion 62 that is provided continuously to the mounting portion 61 and extinguishes the arc, and the opening 63 into which the movable electrode 20 is inserted. And have. The mounting portion 61 is provided with a locking hole 61 </ b> A for locking the locking protrusion 36 </ b> B of the fixed electrode housing portion 36. Thus, the sealing degree is high by covering the fixed electrode housing portion 36 with the mounting portion 61 of the arc extinguishing device 60. Further, when arc-extinguishing gas is generated and the internal pressure of the arc-extinguishing device 60 becomes too high, the arc-extinguishing gas is discharged from the power supply side connection terminal 35 side.

As shown in FIGS. 1 and 2, a phase-opening shaft 46 is provided between the left fixing plate 102 and the right fixing plate 103 so as to be rotatable.
As shown in FIG. 10, the phase loss opening shaft 46 is located above the mounting base 101. The phase loss opening shaft 46 and the driven lever 45 are connected via a phase loss connection link 47. The phase loss connection link 47 is provided for each phase. The center of the phase-opening link 47 is fixed to the phase-opening shaft 46. One end of the phase loss connection link 47 is pivotally attached to the other end of the driven lever 45 so as to be rotatable.

  As shown in FIG. 9, the first side surface portion 101 </ b> A of the mounting base 101 is provided with a phase failure restriction portion 101 </ b> F that restricts the movement range of the phase loss connection link 47. The phase-opening restricting portion 101F is a square hole that is installed with the other end of the phase-opening link 47 penetrating therethrough.

  As shown in FIG. 22, the switch 1 includes a latch mechanism 70 that holds the closed state. The latch mechanism 70 includes an engagement link 71 that engages with the locking portion 2 </ b> A of the operation handle 2. The engagement link 71 can be rotated by a rotating shaft 72 extending in the left-right direction. The engaging link 71 includes an engaging portion 71A that engages with the engaging portion 2A, an operation portion 71B that allows the user to change engagement and disengagement between the engaging portion 2A and the engaging portion 71A, and a phase loss. Sometimes a release portion 71C for releasing the engagement between the locking portion 2A and the engagement portion 71A is provided. The engagement link 71 operates the operation unit 71B in a state where the operation handle 2 is in the closing state, and engages the engagement unit 71A with the locking unit 2A.

  As shown in FIG. 23, the switch 1 is provided with a trip mechanism 76 that releases the closed state and changes it to the open state. The trip mechanism 76 includes an opening spring 77 that biases the operation shaft 31 in the opening direction. A holding portion 107 that holds the opening spring 77 is fixed to the right fixing plate 103. A locking portion 33 that locks the opening spring 77 is fixed to the operation shaft 31. The release spring 77 is suspended from the locking portion 33 and the holding portion 107 of the operation shaft 31.

  As shown in FIG. 22, the trip mechanism 76 includes an opening link 78 that releases the engagement link 71. The open link 78 is fixed to the right end portion 46 </ b> A of the phase loss open shaft 46. As the phase loss release shaft 46 rotates, the release link 78 rotates and contacts the release portion 71C, thereby rotating the engagement link 71 around the rotation shaft 72 to engage the engagement portion 71A and the locking portion. The engagement with 2A is released. Further, when the user operates the operation portion 71B of the engagement link 71, the engagement with the locking portion 2A is released. When the engagement with the locking portion 2 </ b> A is released, the operating shaft 31 is rotated in the opening direction by the urging force of the opening spring 77 to be changed to the opened state.

  As shown in FIG. 1, the switch 1 includes a first operation detection device 80 that detects opening and closing of the switch 1 and a second operation detection device 90 that detects blowing of the current limiting fuse. The first motion detection device 80 is fixed to the lower side of the right fixed plate 103. The second motion detection device 90 is fixed on the upper side of the right fixed plate 103.

  As shown in FIGS. 24 and 25, the first motion detection device 80 includes an attachment member 81 attached to the switch 1 and a sliding member 82 that slides relative to the attachment member 81. The attachment member 81 is fixed to the right fixing plate 103 by screws 89. The attachment member 81 is formed with a guide hole 81 </ b> A for guiding the displacement of the sliding member 82. The guide hole 81A is formed in the vertical direction. At the lower end of the guide hole 81A of the mounting member 81, a stopper 81B is fixed which closes the lower end of the guide hole 81A and contacts the sliding member 82.

  Further, the first motion detection device 80 includes a limit switch 83 that outputs a signal when the sliding member 82 abuts, and a connecting link 84 that connects the operating handle 2 that operates when the switch 1 is opened and closed and the sliding member 82. And. The sliding member 82, the limit switch 83, and the connection link 84 are located below the operation handle 2. One end of the connection link 84 is pivotally connected to the substantially center in the longitudinal direction of the operation handle 2. The other end of the connecting link 84 is inserted into a groove 82D formed at the center in the left-right direction of the sliding member 82 and is connected rotatably. The groove 82D extends along the sliding direction.

  The second motion detection device 90 includes an attachment member 91 attached to the switch 1 and a sliding member 92 that slides relative to the attachment member 91. The attachment member 91 is fixed to the right fixing plate 103 by screws 99. The mounting member 91 is formed with a guide hole 91 </ b> A for guiding the displacement of the sliding member 92. The guide hole 91A is formed in the vertical direction. At the upper end of the guide hole 91A of the mounting member 91, a stopper 91B that closes the upper end of the guide hole 91A and abuts against the sliding member 92 is fixed.

  Further, the second motion detection device 90 includes a limit switch 93 that outputs a signal when the sliding member 92 comes into contact, and a connecting link 94 that connects the sliding member 92 and the open link 78 that operates when the current limiting fuse is blown. And. The sliding member 92, the limit switch 93, and the connection link 94 are located above the opening link 78. One end of the connection link 94 is pivotally connected to the connection member 79. The connecting member 79 is a member fixed to the open link 78. The other end of the connecting link 94 is inserted into a groove 92D formed at the center in the left-right direction of the sliding member 92 and is connected to be rotatable. The groove 92D extends along the sliding direction.

  As shown in FIGS. 26 and 27, the sliding member 82 has a sliding portion 82A that slides in a state of being fitted in the guide hole 81A. The sliding portion 82A is provided with a pair of grooves that fit into the edge of the guide hole 81A. The limit switch 83 has a pair of contacts 83 </ b> A that come into contact with the sliding member 82. The sliding member 82 has an inclined surface 82B that contacts the contact 83A of the limit switch 83 and a flat surface 82C. The limit switch 83 is turned off between the position where the contact 83A does not contact the inclined surface 82B and the position until the approximate center of the inclined surface 82B after contacting the inclined surface 82B, and the contact 83A is substantially the same as the inclined surface 82B. The switch is turned on at the position of the flat surface 82C from the center. The limit switch 83 outputs a signal when the switch is on. The limit switch 83 is turned on until the contact 83A contacts the inclined surface 82B from the position where the contact 83A does not contact the inclined surface 82B to the approximate center of the inclined surface 82B, and the contact 83A becomes the inclined surface 82B. The switch may be turned off at the position of the flat surface 82C from the approximate center.

  FIG. 26 shows a closing state in which the operation handle 2 is rotated upward. Since the connecting link 84 is pulled upward by the operation handle 2, the sliding member 82 is positioned at the upper end of the guide hole 81A. The contact 83A of the limit switch 83 is in contact with the flat surface 82C of the sliding member 82. The limit switch 83 outputs a signal. Note that signal lines for outputting signals are not shown.

  FIG. 27 shows an open state in which the operation handle 2 is rotated downward. Since the connecting link 84 is pushed downward by the operation handle 2, the sliding member 82 is positioned below the guide hole 81A. The contact 83A of the limit switch 83 is not in contact with the inclined surface 82B and the flat surface 82C of the sliding member 82. The limit switch 83 does not output a signal. Note that signal lines for outputting signals are not shown.

  As shown in FIGS. 28 and 29, the sliding member 92 has a sliding portion 92A that slides in a state of being fitted in the guide hole 91A. The sliding portion 92A is provided with a pair of grooves that fit into the edge portion of the guide hole 91A. The limit switch 93 has a pair of contacts 93 </ b> A that come into contact with the sliding member 92. The sliding member 92 has an inclined surface 92 </ b> B and a flat surface 92 </ b> C that come into contact with the contact 93 </ b> A of the limit switch 93. The limit switch 93 is turned off until the contact 93A contacts the inclined surface 92B from the position where the contact 93A does not contact the inclined surface 92B to the approximate center of the inclined surface 92B. The switch is turned on at the position of the flat surface 92C from the center. The limit switch 93 outputs a signal when the switch is on. The limit switch 93 is turned on until the contact 93A contacts the inclined surface 92B from the position where the contact 93A does not contact the inclined surface 92B to the approximate center of the inclined surface 92B, and the contact 93A becomes the inclined surface 92B. The switch may be turned off at the position of the flat surface 92C from the approximate center.

  FIG. 28 shows a closing state in which the operation handle 2 is rotated upward. In the input state, the open link 78 is rotated downward. Since the connecting link 94 is pulled downward by the connecting member 79, the sliding member 92 is located at the lower end of the guide hole 91A. The contact 93A of the limit switch 93 is not in contact with the inclined surface 92B and the flat surface 92C of the sliding member 92. The limit switch 93 does not output a signal. Note that signal lines for outputting signals are not shown.

  FIG. 29 shows an open state in which the operation handle 2 is rotated downward. In the open state, the open link 78 is rotated upward. Since the connecting link 94 is pushed upward by the connecting member 79, the sliding member 92 is positioned at the upper end of the guide hole 91A. The contact point 93 </ b> A of the limit switch 93 is in contact with the flat surface 92 </ b> C of the sliding member 92. The limit switch 93 outputs a signal. Note that signal lines for outputting signals are not shown.

Next, operation | movement of the switch 1 comprised as mentioned above is demonstrated.
As shown in FIG. 13, the movable electrode 20 is separated from the fixed electrode 34 in the open state of the switch 1. At this time, as shown in FIG. 27, in the first motion detection device 80, since the operation handle 2 is rotated downward, the sliding member 82 is positioned downward via the connecting link 84, and the limit switch The 83 contact 83A is not in contact with the inclined surface 82B and the flat surface 82C, and the switch is off. Therefore, no signal is output from the limit switch 83. Further, as shown in FIG. 29, in the second motion detection device 90, since the open link 78 is open, the sliding member 92 is positioned upward via the connecting member 79 and the connecting link 94, so that the limit switch 93 contacts 93A are in contact with the flat surface 92C, and the switch is on. Therefore, a signal is output from the limit switch 93.

  Then, when the operation handle 2 is operated in the closing direction in the opened state of the switch 1 shown in FIG. 13, the movable electrode 20 rotates toward the fixed electrode 34 with the first screw 21 as the rotation center via the operation mechanism. Then, the tip of the movable electrode 20 moves toward the opening 63 of the arc extinguishing device 60.

  As shown in FIG. 5, when the movable electrode 20 is rotated to the fixed electrode 34 side with the first screw 21 as a rotation axis, the distal end portion of the movable electrode 20 passes from the opening 63 to the slit portion of the arc extinguishing device 60. Enter 62. Thereafter, the movable electrode 20 is rotated toward the fixed electrode 34 with the first screw 21 as the rotation center, and the distal end portion of the movable electrode 20 comes into contact with the fixed electrode 34 and enters the input state. Then, the operation link 2 is fixed by engaging the release link 78 with the operation handle 2. At this time, as shown in FIG. 26, since the operation handle 2 is rotated upward, the first motion detection device 80 has the sliding member 82 positioned upward via the connecting link 84 and the limit switch. 83 contacts 83A are in contact with the flat surface 82C, and the switch is on. Therefore, a signal is output from the limit switch 83. As shown in FIG. 28, since the open link 78 is closed in the second motion detecting device 90, the sliding member 92 is positioned below via the connecting member 79 and the connecting link 94, and the limit switch 93 is placed. The contact 93A is not in contact with the inclined surface 92B and the flat surface 92C, and the switch is off. Therefore, no signal is output from the limit switch 93.

  As shown in FIG. 5, the movable electrode 20 is in contact with the fixed electrode 34 when the switch 1 is turned on. When the operation handle 2 is operated in the opening direction, the movable electrode 20 rotates to the side away from the fixed electrode 34 with the first screw 21 as the rotation center via the operation mechanism, and the distal end portion of the movable electrode 20 Is separated from the fixed electrode 34. In addition, when any of the three-phase current limiting fuses is blown in the on state, the display unit of the blown display device is protruded and the driven lever 45 is rotated, and the movable electrodes 20 of the respective phases are simultaneously moved through the open phase release mechanism. Is spaced from the fixed electrode 34. At this time, as shown in FIG. 29, since the open link 78 is open, the second motion detecting device 90 has the sliding member 92 positioned upward via the connecting member 79 and the connecting link 94, and the limit The contact 93A of the switch 93 is in contact with the flat surface 92C, and the switch is on. Therefore, a signal is output from the limit switch 93.

  As shown in FIG. 13, an arc is generated between the fixed electrode 34 and the distal end portion of the movable electrode 20 that are separated from each other. The generated arc is extinguished due to the internal pressure in the arc extinguishing device 60 being increased by the arc extinguishing gas generated in the slit portion 62 of the arc extinguishing device 60. And the movable electrode 20 leaves | separates from the arc-extinguishing apparatus 60, and the switch 1 will be in an open state.

As described above, according to this embodiment, the following effects can be obtained.
(1) Since the fixed electrode 34 is surrounded by the bottomed cylindrical fixed electrode housing portion 36 and the outer periphery of the fixed electrode housing portion 36 is covered by the mounting portion 61, the arc extinguishing device 60 is not well formed. Also, the escape of the arc-extinguishing gas can be suppressed by the double wall of the fixed electrode housing portion 36 and the mounting portion 61. Therefore, even if the arc-extinguishing device 60 is poorly formed, it is possible to suppress the deterioration of the arc-extinguishing performance.

(2) The arc-extinguishing device 60 can be attached to the fixed electrode support portion 12 by the locking hole 61 </ b> A of the mounting portion 61 of the arc-extinguishing device 60 engaging with the locking projection 36 </ b> B of the fixed electrode housing portion 36.
(3) When the fixed electrode 34 is accommodated in the fixed electrode accommodating portion 36, positioning can be performed by fitting the lower convex portion 34A of the fixed electrode 34 into the concave portion 36A of the fixed electrode accommodating portion 36.

  (4) When the fixed electrode 34 is fixed to the fixed electrode support portion 12, the plate electrode nut 39 is placed on the drop suppression portion 37 </ b> C provided in the fixed electrode fixing portion 37 and the screw 38 is tightened to tighten the fixed electrode 34. It can be fixed to the fixed electrode support part 12.

In addition, the said embodiment can also be implemented with the following forms which changed this suitably.
In the above configuration, the drop suppression unit 37 </ b> C provided in the fixed electrode fixing unit 37 may be omitted.

In the above configuration, the concave portion 36 </ b> A provided in the bottom portion inside the fixed electrode housing portion 36 may be omitted.
In the above configuration, the locking protrusion 36 </ b> B provided outside the fixed electrode housing portion 36 and the locking hole 61 </ b> A provided in the attachment portion 61 may be omitted.

  DESCRIPTION OF SYMBOLS 1 ... Switch, 2 ... Operation handle, 2A ... Locking part, 10 ... Supporting insulator, 11 ... Base part, 11A ... Fixing part, 11B ... Nut accommodating part, 11C ... Protrusion, 11D ... Through-hole, 12 ... Fixing Electrode support portion, 13 ... fuse support portion, 14 ... stand support portion, 15 ... fuse support stand, 15A ... upper surface, 16 ... center portion, 16A ... nut housing portion, 17 ... upper end portion, 18 ... lower end portion, 18A ... nut Accommodating portion, 20 ... movable electrode, 20A ... lower end portion, 20B ... central portion, 21 ... first screw, 21A ... nut, 22 ... projection, 24 ... bearing fitting, 24A ... first side portion, 24B ... second side surface 24C ... fixing part 24D ... opening restricting part 25 ... second screw 26 ... plate nut 27 ... conductive plate 27A ... clamping part 27B ... attaching part 27C ... connecting part 27D ... projection 30 ... Push-up bar, 31 ... Operating shaft, 31A ... Right end, 3 ... Push-up bar connecting link, 33 ... Locking portion, 34 ... Fixed electrode, 34A ... Lower convex portion, 35 ... Power supply side connection terminal, 35A ... Through hole, 36 ... Fixed electrode housing portion, 36A ... Recessed portion, 36B ... Lock Projection, 37: Fixed electrode fixing part, 37A: Projection part, 37B: Interphase pressure-resistant wall, 37C: Drop suppression part, 38 ... Screw, 39 ... Plate-shaped nut, 40 ... Upper fuse gripping fitting, 41 ... Grasping holder, 42 ······························································································································· 45 52A ... projection, 53 ... screw, 54 ... plate-like nut, 55 ... load side connection terminal, 55A ... projection, 60 ... arc extinguishing device, 61 ... mounting portion, 61A ... locking hole, 62 ... slit portion, 63 ... Opening portion, 70 ... latch mechanism, 71 ... engagement release 71A ... engaging part, 71B ... operating part, 71C ... releasing part, 72 ... rotating shaft, 76 ... trip mechanism, 77 ... opening spring, 78 ... opening link, 79 ... connecting member, 80 ... first motion detecting device 81 ... Mounting member, 81A ... Guide hole, 81B ... Stopper, 82 ... Sliding member, 82A ... Sliding part, 82B ... Inclined surface, 82C ... Flat surface, 82D ... Groove, 83 ... Limit switch, 83A ... Contact, 84 ... Link, 89 ... Screw, 90 ... Second motion detector, 91 ... Mounting member, 91A ... Guide hole, 91B ... Stopper, 92 ... Sliding member, 92A ... Sliding part, 92B ... Inclined surface, 92C ... Flat surface, 92D ... groove, 93 ... limit switch, 93A ... contact, 94 ... connecting link, 99 ... screw, 101 ... mounting base, 101A ... first side surface portion, 101B ... second side surface portion, 101C ... third side surface portion 10 DESCRIPTION OF SYMBOLS 1D ... Through-hole, 101E ... Through-hole, 101F ... Opening phase restricting part, 102 ... Left side fixing plate, 103 ... Right side fixing plate, 104 ... Plate-shaped nut, 105 ... Screw, 106 ... Fixing plate, 106A ... Notch part, 106B ... Through hole, 106C ... Operation restricting portion, 107 ... Holding portion, 110 ... Insulating barrier, 111 ... Mounting bracket, L1, L2, L3 ... Center line.

Claims (4)

A fuse-equipped switch having a fixed electrode and a movable electrode provided so as to be able to contact and separate from the fixed electrode,
A fixed electrode support to which the fixed electrode is attached;
An arc extinguishing device that extinguishes an arc generated when the movable electrode is released from the fixed electrode, and
At the tip of the fixed electrode support portion, a fixed electrode storage portion having a bottomed cylindrical shape for storing the fixed electrode and having an opening on the side where the movable electrode is inserted is provided.
The arc extinguishing device covers an outer periphery of the fixed electrode housing portion, and is attached to the fixed electrode housing portion, and a slit portion that is provided continuously to the mounting portion and extinguishes the arc. An opening into which the movable electrode is inserted; A locking projection is provided outside the fixed electrode housing portion,
The switch with fuse according to claim 1, wherein a locking hole for locking to the locking protrusion is provided in the mounting portion. The switch with a fuse according to claim 1, wherein a concave portion that fits with a lower convex portion of the fixed electrode is provided at a bottom portion inside the fixed electrode housing portion. A fixed electrode fixing portion for fixing the fixed electrode by a plate-like nut and a screw is provided at the tip of the fixed electrode housing portion,
The switch with a fuse according to any one of claims 1 to 3, wherein the fixed electrode fixing portion is provided with a drop suppressing portion that suppresses the drop of the plate nut.

Images