JP6424121B2 - Power distribution equipment - Google Patents

Description

  The present invention relates to a power distribution device such as a circuit breaker and a switch that open and close a circuit by moving a movable electrode to and from a fixed electrode.

  Power distribution equipment such as a circuit breaker and a 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 rotatably supported. The power distribution device causes the movable electrode to contact 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, the power distribution device opens and closes the circuit. The movable electrode has a preset contact position (set input position) with the fixed electrode at the time of input.

  However, the movable electrode may cause a so-called overrun that passes the contact position with the fixed electrode when rotating in the closing direction due to deflection or dimensional error of components or cases of the power distribution device. When the movable electrode overruns, the movable electrode may be damaged by coming into contact with components such as the fixed electrode and the arc extinguishing chamber. Therefore, in order to suppress damage due to this overrun, a power distribution device has been proposed in which a buffer member is provided below a contact blade provided on a fixed electrode (see, for example, Patent Document 1).

JP 2002-208332 A

  By the way, in the power distribution apparatus described in Patent Document 1, when the movable electrode is thrown in vigorously, the portion of the buffer member that contacts the movable electrode may be roughened or cracked. For this reason, when the buffer member is damaged as described above, the movable electrode may come into contact with parts other than the contact portion of the fixed electrode and parts such as the arc extinguishing chamber at the time of loading, thereby damaging each member.

  This invention is made | formed in view of such a situation, The objective is to provide the power distribution apparatus which can suppress the damage of each member by the overrun at the time of injection | throwing-in of a movable electrode.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
A power distribution device that solves the above problems includes a fixed electrode, a movable electrode that is rotatable with respect to the fixed electrode, an arc extinguishing chamber that covers the fixed electrode and has an opening into which the movable electrode can be inserted, A power distribution device that is closed when the movable electrode comes into contact with the fixed electrode, and is opened when the movable electrode is separated from the fixed electrode, and is attached to the arc-extinguishing chamber, the movable electrode The buffer member is provided on an extension line of the movable range, and the buffer member is provided at a position where the movable electrode collides with the movable electrode when at least the contact position where the movable electrode contacts the fixed electrode is exceeded. That is the gist.

  According to the above configuration, the buffer member is attached to the arc extinguishing chamber, and the movable electrode collides with the buffer member when the movable electrode rotates in the closing direction and at least exceeds the contact position. For this reason, even if a so-called overrun occurs where the movable electrode passes through the contact position with the fixed electrode, the movable electrode is prevented from contacting parts other than the contact portion of the fixed electrode or parts such as the arc extinguishing chamber. Can do. Therefore, damage to each member due to overrun when the movable electrode is inserted can be suppressed.

In the power distribution device, it is preferable that the buffer member protrudes to the side away from the arc extinguishing chamber in the rotation direction of the movable electrode.
According to the above configuration, the buffer member protrudes to the side away from the arc extinguishing chamber in the rotation direction of the movable electrode. For this reason, when the movable electrode rotates in the closing direction, it always collides with the buffer member before the arc extinguishing chamber, so that the arc extinguishing chamber can be prevented from being damaged and the impact can be suppressed.

In the power distribution device, it is preferable that a collision surface of the buffer member that collides with the movable electrode is formed in parallel with a collision surface of the movable electrode that collides.
According to the above configuration, since the impact surface of the buffer member is formed in parallel with the impact surface of the movable electrode, the impact at the time of collision between the movable electrode and the buffer member can be absorbed by the surface, and a part of the movable electrode It is possible to suppress the impact on the surface.

About the said power distribution apparatus, it is preferable that the said buffer member is provided with the convex part which covers the part on the extension line | wire of the movable range of the said movable electrode in the opening part of the said arc extinguishing chamber.
According to the above configuration, since the convex portion of the buffer member covers a portion on the extension line of the movable range of the movable electrode at the opening of the arc extinguishing chamber, it is possible to further absorb an impact when the movable electrode collides with the buffer member. it can.

About the said power distribution apparatus, it is preferable that the said buffer member is attached in the state which covered the outer surface of the said arc-extinguishing chamber.
According to the said structure, since a buffer member covers the outer surface of an arc-extinguishing chamber, an arc-extinguishing chamber can be protected.

  In the power distribution device, the buffer member is provided at a collision portion that collides with the movable electrode, a grip portion that extends from both ends of the collision portion, grips the arc extinguishing chamber, and a tip portion of the grip portion. It is preferable to include a fixing portion that is fixed to the arc extinguishing chamber.

  According to the above configuration, since the buffer member is fixed to the arc extinguishing chamber by the fixing portion of the buffer member in a state where the grip portion of the buffer member grips the arc extinguishing chamber, it can be easily attached to the arc extinguishing chamber. . Moreover, the strength of the arc extinguishing chamber can be increased.

About the said power distribution apparatus, it is preferable that a step part is provided in the outer surface of the said arc-extinguishing chamber, and the said buffer member is supported by the said step part.
According to the said structure, since a buffer member is supported by the step provided in the outer surface of an arc extinguishing chamber, positioning of a buffer member is easy. Moreover, the impact when the movable electrode collides with the buffer member can be supported by the step portion of the arc extinguishing chamber.

About the said power distribution apparatus, it is preferable that the said buffer member is provided with the contact part contact | abutted to the support member which supports the said arc-extinguishing chamber.
According to the above configuration, the contact portion of the buffer member is in contact with the support member that supports the arc extinguishing chamber. It can be received and the impact on the arc extinguishing chamber can be reduced.

  In the power distribution device, it is preferable that the movable electrode includes a second buffer member that contacts the buffer member when at least the contact position is exceeded, with the buffer member serving as a first buffer member.

  According to the above configuration, the second buffer member collides with the first buffer member when the movable electrode rotates in the closing direction and at least exceeds the contact position. For this reason, when a so-called overrun occurs where the movable electrode passes the contact position with the fixed electrode, the first buffer member and the second buffer member collide with each other, and the impact can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the damage of each member by the overrun at the time of throwing in a movable electrode can be suppressed.

The internal front view which shows the open state of the switch in 1st Embodiment of a power distribution apparatus. The internal front view which shows the injection state of the switch of the embodiment. The partial cross section figure which shows the fixed electrode and its periphery of the switch of the embodiment. The top view of the buffer member attached to the arc-extinguishing chamber of the switch of the embodiment. The front view which shows the injection | throwing-in state of the switch in 2nd Embodiment of a power distribution apparatus. The right view which shows the open state of the switch of the embodiment. The right view which shows the injection state of the switch of the embodiment. The right view which shows the contact position of the arc extinguishing chamber and buffer member of the switch of the embodiment. The right view which shows the modification of the buffer member attached to the arc-extinguishing chamber. The right view which shows the modification of the buffer member of a switch. (A) (b) is a right view which shows the modification of the buffer member of a switch. (A) (b) is a right view which shows the modification of the buffer member of a switch. (A) (b) is a right view which shows the modification of the buffer member of a switch. The right view which shows the modification of the buffer member of a switch. The internal front view which shows the injection state of the switch of a modification. The internal front view which shows the open state of the switch of a modification.

(First embodiment)
Hereinafter, with reference to FIGS. 1-4, 1st Embodiment which actualized the power distribution apparatus to the switch with a case is described.

  As shown in FIGS. 1 and 2, the switch 11 is housed in a rectangular parallelepiped main body case 12. The switch 11 can be turned on and off for each of the three phases. The power supply-side bushing 13 and the load-side bushing 14 are respectively supported by penetrating through the opposing inner side walls of the main body case 12 while facing each other. 1 and 2 show only one phase.

  A power supply side conductor 15 projects from the inner end of the power supply side bushing 13. An arc extinguishing chamber 30 is provided at the tip of the power supply side conductor 15. A fixed electrode 16 is fixed in the arc extinguishing chamber 30.

  A load-side conductor 19 protrudes from the inner end of the load-side bushing 14. A proximal end portion of the movable electrode 22 is rotatably supported at the distal end portion of the load-side conductor 19 via a shaft 21. The movable electrode 22 is a single blade formed in a V shape (sickle shape) by a single plate.

  A rotating shaft 24 operatively connected to an operation handle (not shown) provided outside the body case 12 via an opening / closing mechanism (not shown) made up of a plurality of links or the like is provided at the lower part in the body case 12. It has been. The rotating shaft 24 is operatively connected to the movable electrode 22 via a lever 25 and a drive link 26. Therefore, when an operation handle (not shown) is operated, the movable electrode 22 is moved to the open position shown in FIG. 1 with the shaft 21 as the rotation center via the opening / closing mechanism, the rotation shaft 24, the lever 25, and the drive link 26. It moves between the input positions shown in FIG.

  As shown in FIG. 3, an arc extinguishing chamber 30 is provided at the inner end of the power supply side bushing 13. The arc extinguishing chamber 30 includes an arc extinguishing chamber main body 31 provided so as to cover the fixed electrode 16 and a bottom cover 34 covering the lower part of the arc extinguishing chamber main body 31. An arc extinguishing chamber fixing bracket 34a is fixed to the lower portion of the tip of the power supply side conductor 15 with a bolt 34b. The arc extinguishing chamber main body 31 and the bottom cover 34 are fastened and fixed to the arc extinguishing chamber fixing fitting 34 a by bolts 36 and nuts 37. In other words, the connecting portions provided at both ends of the arc-extinguishing chamber fixing bracket 34a are provided at the upper portions of the fastening portions provided at the lower portions of the opposing walls of the arc-extinguishing chamber main body 31 and the opposing sidewalls of the bottom cover 34. The connecting portion is fastened and fixed with bolts 36 and nuts 37. Thereby, the arc-extinguishing chamber main body 31 and the bottom cover 34 are detachably connected to the arc-extinguishing chamber fixing bracket 34a.

  The arc extinguishing chamber main body 31 includes a box-shaped accommodation portion 32 that covers the power supply side conductor 15 and the fixed electrode 16, and a slit arc extinguishing chamber 33 that is formed obliquely with respect to the upper surface of the accommodation portion 32. ing. The gap arc extinguishing chamber 33 has a narrower gap in the interphase direction than the accommodating portion 32, and a step portion 32 a is formed at the connection portion of the slit arc extinguishing chamber 33 on the upper surface of the accommodating portion 32. The arc extinguishing chamber body 31 is formed of a synthetic resin material having arc extinguishing properties and insulating properties. In the slit arc extinguishing chamber 33, a slit groove 35 is continuously formed in the central portion extending from the upper wall of the housing portion 32 to the side wall on the load side bushing 14 side. The movable electrode 22 can pass through the slit groove 35.

  The fixed electrode 16 provided in the housing portion 32 includes a pair of fixed contacts 17. The two fixed contacts 17 are urged in the pressure-bonding direction with respect to the power source conductor 15 by the leaf springs 18 respectively. In addition, a regulating member 38 formed in a square ring shape is mounted in the accommodating portion 32. The regulating member 38 is made of a metal material. The regulating member 38 constitutes an interlocking member that moves the sandwiching gap between the two fixed contacts 17 within the movement locus of the movable electrode 22 in conjunction with the movement of the movable electrode 22 in the arc extinguishing chamber 30 in the swing direction.

  The arc extinguishing chamber 30 has an opening 39 into which the movable electrode 22 can be inserted. The opening 39 opens in accordance with the rotation range of the movable electrode 22. That is, the opening 39 opens from the upper end surface 33a of the slit arc extinguishing chamber 33 to the front end surface 33b that is the surface on the movable electrode 22 side. An inclined portion 33c is formed at the lower end portion of the front end surface 33b. The inclined portion 33c is inclined downward on the movable electrode 22 side.

  As shown in FIG. 2, a buffer member 40 is attached to the arc extinguishing chamber 30. The buffer member 40 is provided on an extension line of the movable range of the movable electrode 22 (range indicated by dots in the drawing). The buffer member 40 is provided at a position where it collides with the movable electrode 22 when a so-called overrun occurs when the movable electrode 22 exceeds a predetermined contact position where the movable electrode 22 contacts the fixed electrode 16 at the time of charging. The buffer member 40 is formed of an elastic member such as rubber having insulation properties, and absorbs an impact caused by a collision with the movable electrode 22. The “movable range” here refers to a contact position where the movable electrode 22 contacts the fixed electrode 16, and the movable electrode 22 may exceed this contact position when the force in the closing direction is strong. A portion where the movable electrode 22 is positioned when the contact position is exceeded is defined as “on the extension line of the movable range”.

  As shown in FIG. 4, the buffer member 40 is U-shaped when viewed from above, and is attached by gripping the arc extinguishing chamber 30. That is, the buffer member 40 is provided at the collision part 41 that collides with the movable electrode 22, the grip part 42 that extends from both ends of the collision part 41 and grips the arc extinguishing chamber 30, and the tip of the grip part 42. A fixing portion a that is fixed to the arc chamber 30. The fixing portion 42a is configured to tighten the bolts 43 and nuts 44 as fixing members, thereby bringing the gripping portion 42 into contact with the arc extinguishing chamber 30, and engaging the fixing portion 42a with the back surface of the arc extinguishing chamber 30, 40 is fixed to the arc extinguishing chamber 30. Further, the lower end surface of the gripping portion 42 of the buffer member 40 is abutted and supported by a step portion 32 a of the accommodating portion 32 of the arc extinguishing chamber 30 and the slit arc extinguishing chamber 33. Thereby, when the movable electrode 22 collides with the collision part 41 of the buffer member 40, it can prevent that the buffer member 40 slip | deviates from the arc-extinguishing chamber 30, and the step part 32a and the accommodating part 32 can reduce the impact force at the time of a collision. It can be borne on the top surface of.

  As shown in FIG. 2, the collision portion 41 is located on the front end surface 33 b of the arc extinguishing chamber 30 and collides with the abdominal portion 22 a on the proximal end side of the movable electrode 22. The collision surface 41a that collides with the movable electrode 22 of the collision portion 41 of the buffer member 40 is formed in parallel with the collision surface of the abdominal portion 22a with which the movable electrode 22 collides, and is larger than the lateral width of the collision surface of the abdominal portion 22a. Largely formed. The collision surface 41a is formed to be inclined so that the impact force is directed in the vicinity of the bolt 34b for fixing the arc-extinguishing chamber fixing bracket 34a, the bolt 36 for fixing the arc-extinguishing chamber main body 31, and the nut 37. Thereby, the antinode part 22a of the movable electrode 22 can contact | abut in the surface with the collision surface 41a, and the impact force at the time of the movable electrode 22 colliding can be borne by each fixing | fixed part of the arc-extinguishing chamber 30. FIG. . Further, the buffer member 40 protrudes to the side away from the arc extinguishing chamber 30 in the rotating direction of the movable electrode 22. And the collision surface 41a of the buffer member 40 is located above the inclination part 33c of the front-end surface 33b. That is, the front end portion of the buffer member 40 protrudes by a length H1 from the inclined portion 33c of the front end surface 33b of the arc extinguishing chamber 30. Thereby, when the movable electrode 22 rotates in the closing direction, it always collides with the buffer member 40 before the arc extinguishing chamber 30. In particular, the movable electrode 22 does not collide with the inclined portion 33c of the front end surface 33b.

Next, the operation of the switch 11 configured as described above will be described.
As shown in FIG. 1, the movable electrode 22 is separated from the fixed electrode 16 in the open state. When an operation handle (not shown) is operated in the closing direction, the movable electrode 22 moves toward the fixed electrode 16 with the shaft 21 as a rotation center via the opening / closing mechanism, the rotation shaft 24, the lever 25, and the drive link 26. It rotates and the front-end | tip part of the movable electrode 22 moves toward the inside of the arc extinguishing chamber main body 31. FIG.

  As shown in FIG. 2, the tip of the movable electrode 22 enters the arc extinguishing chamber main body 31 through the opening 39 and is rotated toward the fixed electrode 16 about the shaft 21. The tip of the movable electrode 22 contacts the fixed electrode 16 (in a put state).

  At this time, when a so-called overrun occurs in which the movable electrode 22 passes a predetermined contact position with the fixed electrode 16, the abdominal portion 22a of the movable electrode 22 collides with the collision portion 41 of the buffer member 40, and the movable electrode 22 Prevent further rotation. Thereby, it can prevent contacting with parts, such as a part other than the stationary contact 17 of the stationary electrode 16, and the arc extinguishing chamber, by the overrun of the movable electrode 22. In particular, when the switch has an automatic closing mechanism, the effect of the buffer member 40 is significant.

  Here, since the movable electrode 22 collides with the buffer member 40 prior to the arc extinguishing chamber 30, the arc extinguishing chamber 30 can be prevented from being damaged. Since the collision surface 41a of the collision part 41 of the buffer member 40 and the collision surface of the abdomen portion 22a of the movable electrode 22 are parallel, they can receive impacts on the surfaces, and each of the buffer member 40 and the movable electrode 22 is excessive. Generation of excessive stress can be suppressed.

  When an operation handle (not shown) is operated in the opening direction, the movable electrode 22 is separated from the fixed electrode 16 with the shaft 21 as the rotation center via the opening / closing mechanism, the rotation shaft 24, the lever 25, and the drive link 26. The tip of the movable electrode 22 is separated from the fixed electrode 16. At this time, an arc is generated between the fixed electrode 16 and the upper end of the movable electrode 22.

  As shown in FIG. 1, when the movable electrode 22 is rotated about the shaft 21 toward the side away from the fixed electrode 16, the arc extinguishing gas is stored in the arc extinguishing chamber 30 and pressurized, The arc generated between the movable electrode 22 is extinguished. The movable electrode 114 is also separated from the arc extinguishing chamber 30 (open state).

As described above, according to this embodiment, the following effects can be obtained.
(1) The buffer member 40 is attached to the arc extinguishing chamber 30 and collides with the buffer member 40 when the movable electrode 22 rotates in the closing direction and exceeds the contact position. Therefore, even if a so-called overrun occurs where the movable electrode 22 passes the contact position with the fixed electrode 16, the movable electrode 22 is connected to a part other than the fixed contact 17 of the fixed electrode 16 and parts such as the arc extinguishing chamber 30. Contact can be prevented. Therefore, damage to each member due to overrun when the movable electrode 22 is thrown in can be suppressed.

  (2) The buffer member 40 protrudes away from the arc extinguishing chamber 30 in the rotation direction of the movable electrode 22. For this reason, when the movable electrode 22 rotates in the closing direction, it always collides with the buffer member 40 before the arc extinguishing chamber 30, so that the arc extinguishing chamber 30 can be prevented from being damaged and the impact can be suppressed. .

  (3) Since the collision surface 41a of the buffer member 40 is formed in parallel with the collision surface of the movable electrode 22, the impact at the time of the collision between the movable electrode 22 and the buffer member 40 can be absorbed by the surface. The impact applied to a part of 22 can be suppressed.

  (4) Since the buffer member 40 is fixed to the arc-extinguishing chamber 30 by the bolt 43 and the nut 44 of the buffer member 40 in a state where the gripping portion 42 of the buffer member 40 grips the arc-extinguishing chamber 30, It can be easily installed. Further, the strength of the arc extinguishing chamber 30 can be increased.

  (5) Since the buffer member 40 is abutted and supported by the step 32a provided on the outer surface of the arc extinguishing chamber 30, the buffer member 40 can be easily positioned. Further, the impact when the movable electrode 22 collides with the buffer member 40 can be buffered and supported by the step portion 32 a of the arc extinguishing chamber 30.

(Second Embodiment)
Hereinafter, with reference to FIGS. 5 to 8, a second embodiment in which the power distribution device is embodied as a current limiting fuse-equipped switch will be described. The power distribution device of this embodiment is different from the first embodiment in that it does not include a case and a current limiting fuse. Hereinafter, a description will be given focusing on differences from the first embodiment.

  As shown in FIG. 5 and FIG. 6, the air current switch with current limiting fuse is attached to a vertical plate in the switchboard, the fixed electrode 107 is located on the upper side, and the movable electrode 114 is supported on each phase on the lower side. ing.

  The switch includes a mounting base 101 that is bent into a mountain shape. A pair of left-side fixed frame 102 and right-side fixed frame 103 having an L-shaped cross section are fixed to the left and right sides of mounting base 101. On the upward slope of the mountain-shaped portion of the mounting base 101, an upper support insulator 104 is fixed for each phase via a fixing plate. Further, a lower support insulator 105 is fixed to each phase on the downward slope of the mountain-shaped portion of the mounting base 101 so as to form a V shape with respect to the upper support insulator 104.

  A box-shaped arc extinguishing chamber 130 is fixed to the tip of the upper support insulator 104 with screws 138. A fixed electrode 107 is connected and fixed to the power supply side connection terminal 108. The power supply side connection terminal 108 is led out above and outside the arc extinguishing chamber 130. The arc extinguishing chamber 130 is fixed so as to cover the fixed electrode 107 and extends to the side away from the upper support insulator 104. A fixing portion 137 is provided at the proximal end of the arc extinguishing chamber 130 so as to face the distal end surface of the upper support insulator 104. The fixing portion 137 of the arc extinguishing chamber 130 is fixed to the upper support insulator 104 by a screw 138. The arc extinguishing chamber 130 is formed of a synthetic resin material having arc extinguishing properties and insulating properties.

  A fuse support base 109 extending in the vertical direction is integrally formed at the tip of the lower support insulator 105. A central portion of the fuse support 109 is connected to the lower support insulator 105. The lower end portion of the fuse support base 109 is inclined toward the lower support insulator 105 side with respect to the upper end portion of the fuse support base 109.

  An upper fuse clamping metal fitting 110 and a lower fuse clamping metal fitting 111 are fixed to the upper and lower ends of the fuse support base 109. Connected to the lower fuse clamping metal 111 is a load side connection terminal 112 that is led out in a lower outer direction.

  The movable electrode 114 is a single blade formed in a V shape by a single plate. The movable electrode 114 is rotatably supported by the fuse support 109. The lower end portion of the movable electrode 114 is rotatably supported on the fuse support 109 by the rotation shaft 115. The movable electrode 114 is provided so as to be able to contact and separate from the fixed electrode 107. The state where the movable electrode 114 is in contact with the fixed electrode 107 is referred to as a circuit input state, and the state where the movable electrode 114 is separated from the fixed electrode 107 is referred to as an open circuit state.

  A driven lever 117 is rotatably supported at the upper end of the fuse support 109. One end of a connecting rod (not shown) that constitutes a part of the phase loss prevention mechanism is fixed to the upper end of the driven lever 117. A current limiting fuse 119 is connected between the upper fuse holding metal fitting 110 and the lower fuse holding metal fitting 111. The current limiting fuse 119 includes a blown display device from which a display unit (not shown) projects when blown. When the display unit of the fusing display device protrudes, the driven lever 117 is rotated, and the movable electrodes 114 of the respective phases are simultaneously opened through the phase loss prevention mechanism.

In addition, one end of a push-up bar 121 that constitutes a part of the opening / closing mechanism is pivotally attached to the center of the movable electrode 114 so as to be rotatable. The push-up bar 121 is made of an insulating material such as synthetic resin.
An operation shaft 123 is installed between the left fixed frame 102 and the right fixed frame 103 so as to be rotatable. An operation handle 122 is fixed to the right end (one end) of the operation shaft 123. When the operation handle 122 is operated, the movable electrode 114 is rotated via the link mechanism including the push-up bar 121 and is brought into contact with and separated from the fixed electrode 107. Here, the link mechanism including the operation handle 122, the operation shaft 123, and the push-up bar 121 functions as an operation mechanism.

  Then, the movable electrode 114 is opened from the on state via the opening / closing mechanism by the operation of the operation handle 122 or the operation of the phase failure prevention mechanism due to the melting of the current limiting fuse 119 of each phase.

  As shown in FIG. 8, the arc extinguishing chamber 130 has an opening extending from a front surface 131 that is a surface opposite to the surface in contact with the upper support insulator 104 of the arc extinguishing chamber 130 to a lower surface 132 that is a surface on the movable electrode 114 side. A portion 133 is provided. At the lower end of the opening 133, an inclined portion 133c that is inclined downward on the movable electrode 22 side is formed.

  A buffer member 140 is attached to the arc extinguishing chamber 130. The buffer member 140 is provided on an extension line of the movable range (indicated by dots in the drawing) of the movable electrode 114. The buffer member 140 is provided at a position where it collides with the movable electrode 114 when a so-called overrun occurs when the movable electrode 114 exceeds the contact position where the movable electrode 114 contacts the fixed electrode 107 at the time of charging. The buffer member 140 is formed of an elastic member such as an insulating rubber and absorbs an impact caused by a collision with the movable electrode 114. The buffer member 140 covers most of the outer surface of the arc-extinguishing chamber 130, and an opening hole 146 is provided in the center part of the portion facing the side surface 135 of the arc-extinguishing chamber 130 for removing the thickness. Note that the “movable range” here refers to a contact position where the movable electrode 114 contacts the fixed electrode 107, and the movable electrode 114 may exceed the contact position when the force in the closing direction is strong. A portion where the movable electrode 114 is located when the contact position is exceeded is defined as “on the extension line of the movable range”.

  As shown in FIG. 5, the buffer member 140 is U-shaped when viewed from the front, and extends in the extending direction of the arc extinguishing chamber 130. That is, the buffer member 140 is provided at the collision portion 141 that collides with the movable electrode 114, the grip portion 142 that extends from both ends of the collision portion 141 and grips the arc extinguishing chamber 130, and the tip of the grip portion 142. And a fixing portion 142 a that is fixed to the arc chamber 130. The fixing portion 142a has two sets of bolts 143, nuts 144, and cylindrical tubes 145. The cylindrical tube 145 is sandwiched between the distal end portion of the gripping portion 142, the bolt 143 is inserted into the cylindrical tube 145, and the bolt 143 and the nut 144 are tightened to bring the gripping portion 142 into contact with the arc extinguishing chamber 130, thereby buffering. The member 140 is fixed to the arc extinguishing chamber 130.

  As shown in FIG. 8, two sets of bolts 143, nuts 144, and cylindrical tubes 145 are provided on the upper surface 134 side of the arc extinguishing chamber 130. Further, the lower end surface of the buffer member 140 is abutted and supported by four ribs 136 on each side provided on both side surfaces 135 of the arc extinguishing chamber 130. The rib 136 corresponds to a step portion provided on the outer surface of the arc extinguishing chamber 130.

  The collision part 141 is located on the lower surface 132 of the arc extinguishing chamber 130 and collides with the abdominal part 114 a on the proximal end side of the movable electrode 114. The collision surface 141 a that collides with the movable electrode 114 of the collision portion 141 of the buffer member 140 is formed in parallel with the collision surface of the antinode portion 114 a with which the movable electrode 114 collides. The width of the collision surface 141a of the collision part 141 is formed larger than the width of the collision surface of the abdomen portion 114a. The collision surface 141a is formed so as to be inclined so that the impact force is directed to the vicinity of the center of the screw 138 on the movable electrode 114 side for fixing the arc extinguishing chamber 130 and the mounting surface of the arc extinguishing chamber 130 of the upper support insulator 104. Yes. Thereby, the antinode part 114a of the movable electrode 114 can contact | abut with the collision surface 141a, and the impact force at the time of the collision of the movable electrode 114 can be borne by the fixing | fixed part of the arc-extinguishing chamber 130. FIG. Further, the buffer member 140 protrudes to the side away from the arc extinguishing chamber 130 in the rotating direction of the movable electrode 114. The collision surface 141a of the buffer member 140 is located to the left of the inclined portion 133c of the opening 133. That is, the front end portion of the buffer member 140 protrudes by a length H2 from the opening 133 on the lower surface 132 side of the arc extinguishing chamber 130. Thereby, when the movable electrode 114 rotates in the closing direction, it always collides with the buffer member 140 before the arc extinguishing chamber 130. In particular, the movable electrode 114 does not collide with the inclined portion 133 c of the opening 133.

Next, with reference to FIGS. 6-8, operation | movement of the switch comprised as mentioned above is demonstrated.
As shown in FIG. 6, the movable electrode 114 is separated from the fixed electrode 107 in the open state. When the operation handle 122 is operated in the closing direction, the movable electrode 114 rotates to the fixed electrode 107 side about the rotation shaft 115 via the opening / closing mechanism, and the distal end portion of the movable electrode 114 is extinguished. It moves toward the inside of the chamber 130.

  As shown in FIG. 7, when the movable electrode 114 is rotated about the rotation shaft 115 toward the fixed electrode 107, the distal end portion of the movable electrode 114 enters the main body of the arc extinguishing chamber 130 from the opening 133. Thereafter, the movable electrode 114 is rotated toward the fixed electrode 107 about the rotation shaft 115, and the tip end portion of the movable electrode 114 contacts the fixed electrode 107 (in a put state).

  At this time, when a so-called overrun occurs in which the movable electrode 114 passes a predetermined contact position with the fixed electrode 107, the antinode portion 114a of the movable electrode 114 collides with the collision portion 141 of the buffer member 140, and the movable electrode 114 is moved. Prevent further rotation. Thereby, it can prevent contacting with parts, such as the arc extinguishing chamber 130, parts other than the contact part of the fixed electrode 107 by the overrun of the movable electrode 114. FIG. In particular, when the switch has an automatic closing mechanism, the effect of the buffer member 140 is remarkable.

  Here, since the movable electrode 114 collides with the buffer member 140 prior to the arc-extinguishing chamber 130, the arc-extinguishing chamber 130 can be prevented from being damaged. Since the collision surface 141a of the collision part 141 of the buffer member 140 and the collision surface of the abdomen portion 114a of the movable electrode 114 are parallel to each other, they can receive impacts on the surfaces, and the buffer member 140 and the movable electrode 114 are excessively affected. Generation of excessive stress can be suppressed.

  Further, as shown in FIG. 9, the movable electrode 114 is in contact with the fixed electrode 107 in the input state. When the operation handle 122 is operated in the opening direction, the movable electrode 114 rotates to the side away from the fixed electrode 107 with the rotation shaft 115 as the rotation center via the operation mechanism. Is separated from the fixed electrode 107. At this time, an arc is generated between the fixed electrode 107 and the upper end of the movable electrode 114.

  As shown in FIG. 8, when the movable electrode 114 is rotated about the rotation shaft 115 to the side away from the fixed electrode 107, the arc extinguishing gas is stored in the arc extinguishing chamber 130 and pressurized, and the fixed electrode The arc generated between 107 and the movable electrode 114 is extinguished. The movable electrode 114 is also separated from the arc extinguishing chamber 130 (open state).

As described above, according to the present embodiment, the effects (1) to (5) of the first embodiment can be achieved.
In addition, each said embodiment can also be implemented with the following forms which changed this suitably.

  In each of the above embodiments, the collision parts 41 and 141 of the buffer members 40 and 140 are protruded into the openings 39 and 133 of the arc extinguishing chambers 30 and 130 to contact the movable electrodes 22 and 114 beyond the contact position. The range may be expanded. For example, as shown in FIG. 9, the buffer member 140 includes a first convex portion 151 that protrudes from the surface of the collision portion 141 on the arc extinguishing chamber 130 side to the inclined portion 133 c in the opening 133 of the arc extinguishing chamber 130. Thus, by providing the collision part 141 with the first convex part 151, the space between the tip part of the collision part 141 and the tip part of the opening 133 is filled. As a result, when the movable electrode 114 collides with the tip of the collision portion 141, it is also supported by the first convex portion 151, so that the impact can be received even more by surface collision.

  -In the said 2nd Embodiment, as shown in FIG. 10, you may abbreviate | omit the opening hole 146 provided in the holding part 142 of the buffer member 140. FIG. In this way, the strength of the buffer member 140 and the strength of the arc extinguishing chamber 130 can be further increased.

  In each of the above embodiments, the grip portions 42 and 142 of the buffer members 40 and 140 may be extended so as to cover the side surfaces of the arc extinguishing chambers 30 and 130. For example, as shown in FIG. 11A, a second convex portion 152 is provided in which the gripping portion 142 of the buffer member 140 extends to the front surface 131 along the side surface 135 of the arc extinguishing chamber 30. In this way, the strength of the buffer member 140 and the strength of the arc extinguishing chamber 130 can be further increased.

  In the second embodiment, as shown in FIG. 11B, a third convex portion 153 is provided in which the gripping portion 142 of the buffer member 140 is extended to the fixing portion 137 that fixes the arc extinguishing chamber 130. May be. The buffer member 140 is supported by a fixing portion 137 corresponding to the support member. The fixing portion 137 of the arc extinguishing chamber 130 corresponds to a step provided on the outer surface of the arc extinguishing chamber 130, and the third convex portion 153 corresponds to an abutting portion. In this way, the impact when the movable electrode 114 collides with the buffer member 140 can be supported by the screw 138.

  -In the said 2nd Embodiment, as shown to Fig.12 (a), you may provide the 4th convex part 154 which extended the collision part 141 of the buffer member 140 to the upper support insulator 104. As shown in FIG. That is, the buffer member 140 is supported by the front surface of the upper support insulator 104 corresponding to the support member. The front surface of the upper support insulator 104 corresponds to a step portion, and the fourth convex portion 154 corresponds to a contact portion. In this way, the impact when the movable electrode 114 collides with the buffer member 140 can be supported by the upper support insulator 104.

  In the second embodiment, as shown in FIG. 12 (b), a fifth convex portion 155 is provided in which the collision portion 141 and the grip portion 142 of the buffer member 140 are extended to the tip surface of the upper support insulator 104. May be. That is, the buffer member 140 is supported by the front end surface 104a of the upper support insulator 104 corresponding to the support member. In addition, the front end surface 104a of the upper support insulator 104 corresponds to a stepped portion, and the fifth convex portion 155 corresponds to a contact portion. In this way, the impact when the movable electrode 114 collides with the buffer member 140 can be supported by the upper support insulator 104.

  In the second embodiment, as shown in FIG. 13A, the sixth convex portion 156 is formed by extending a part of the center of the grip portion 142 of the cushioning member 140 to the tip surface of the upper support insulator 104. It may be provided. That is, the buffer member 140 is supported by the center of the front end surface of the upper support insulator 104 corresponding to the support member. In addition, the front end surface of the upper support insulator 104 corresponds to a step portion, and the sixth convex portion 156 corresponds to a contact portion. In this way, the impact when the movable electrode 114 collides with the buffer member 140 can be supported by the upper support insulator 104, and attachment / detachment of the screw 138 is not affected.

  In the second embodiment, as shown in FIG. 13B, a seventh convex portion 157 in which a part of the grip portion 142 of the buffer member 140 is extended to the screw 138 may be provided. That is, the seventh convex portion 157 of the buffer member 140 is brought into contact with the head of the screw 138 corresponding to the support member, and the buffer member 140 is supported by the screw 138. The screw 138 corresponds to a step portion, and the seventh convex portion 157 corresponds to a contact portion. Further, the number of the seventh convex portions 157 is not limited to two, and may be four according to the number of screws 138. In this way, the impact when the movable electrode 114 collides with the buffer member 140 can be supported by the upper support insulator 104 through the screw 138 and the screw 138.

  -In the said 2nd Embodiment, as shown in FIG. 14, you may shorten the length of the extension direction of the buffer member 140 to the minimum. In this way, the total weight of the buffer member 140 can be reduced, which can contribute to cost reduction.

  In the second embodiment, the buffer member 140 is fixed to the arc extinguishing chamber 130 by the bolt 143, the nut 144, and the cylindrical tube 145, but may be fastened only by the bolt 143 and the nut 144. At the time of this fastening, the extinguishing chamber 130 may be covered by bending the tip end portion of the gripping portion 142 of the buffer member 140 toward the back side of the arc extinguishing chamber 130.

In the configuration of the second embodiment, the buffer member 140 may be fixed to the arc extinguishing chamber 130 using an assembly bolt for assembling the arc extinguishing chamber 130.
In the second embodiment, the buffer member 140 is supported by the rib 136 of the arc extinguishing chamber 130. However, if the fixing portion is sufficient for fixing, it is not necessary to contact the rib 136.

  In the first embodiment, the abdominal portion 22a of the movable electrode 22 is in contact with the collision surface 41a of the buffer member 40 as the first buffer member. However, as shown in FIG. An abutting member 50 as a second buffer member may be provided on the abdominal portion 22 a of 22. The contact member 50 is made of an elastic member such as rubber having an insulating property, and includes a first contact portion 50a and a fixed portion 50b. The contact surface 50c of the first contact portion 50a is formed in parallel with the collision surface 41a of the buffer member 40, and is formed to be equal to or smaller than the lateral width of the collision surface 41a. When the movable electrode 22 rotates in the closing direction and the movable electrode 22 passes the contact position with the fixed electrode 16, so-called overrun occurs, the contact member 50 collides with the buffer member 40. If it does in this way, while being able to make it collide reliably, the impact force at the time of a collision can be suppressed further. The contact member 50 can also be used in the second embodiment.

  Further, as shown in FIG. 16, the second contact portion 50d may be provided on the opposite side of the first contact portion 50a of the contact member 50, that is, on the back side of the movable electrode 22 in the fixed portion 50b. The second abutting portion 50d is configured such that the second abutting portion 50d collides with a colliding portion protruding inside the barrier fixing member 60 when the movable electrode 22 rotates in the opening direction and exceeds a predetermined stop position. Configure. The barrier fixing member 60 is a fixing member for disposing the insulating barrier 61 at a predetermined position in the main body case 12, and is formed of an elastic member such as rubber having an insulating property. The contact surface of the second contact portion 50d is formed in parallel with the collision surface of the barrier fixing member 60, and is the same as the vertical width and horizontal width of the collision surface, or smaller than the vertical width and horizontal width of the collision surface. Is formed. For this reason, even if a so-called overrun occurs where the movable electrode 22 passes the stop position, the movable electrode 22 can be prevented from coming into contact with components such as the main body case 12 and the insulation barrier 61. Therefore, damage to each member due to overrun when the movable electrode 22 is opened can also be suppressed.

In each of the above embodiments, the movable electrodes 22 and 114 have a single blade, but the movable electrodes 22 and 114 may have two blades.
In each of the above embodiments, when the movable electrodes 22 and 114 exceed the predetermined contact position, they collide with the buffer members 40 and 140. However, when the movable electrodes 22 and 114 reach the predetermined contact position Alternatively, it may collide with the buffer members 40 and 140.

  In each of the above embodiments, the power distribution device is applied to a switch, but may be applied to a power distribution device such as a circuit breaker.

  DESCRIPTION OF SYMBOLS 11 ... Switch, 12 ... Main body case, 13 ... Power supply side bushing, 14 ... Load side bushing, 15 ... Power supply side conductor, 16 ... Fixed electrode, 17 ... Fixed contact, 18 ... Leaf spring, 19 ... Load side conductivity Body, 21 ... shaft, 22 ... movable electrode, 22a ... belly part, 24 ... rotating shaft, 25 ... lever, 26 ... drive link, 30 ... arc extinguishing chamber, 31 ... arc extinguishing chamber main body, 32 ... accommodating portion, 32a ... Step portion, 33 ... Slit arc-extinguishing chamber, 33a ... Top surface, 33b ... Front surface, 33c ... Inclined portion, 34 ... Bottom cover, 34a ... Arcling chamber fixing bracket, 34b ... Bolt, 35 ... Groove, 36 ... Bolt, 37 ... Nut, 38 ... Regulating member, 39 ... Opening part, 40 ... Buffer member, 41 ... Collision part, 41a ... Collision surface, 42 ... Gripping part, 42a ... Fixing part, 43 ... Balto, 44 ... Nut, 50 ... Contact member, 50a ... first contact portion, 50b ... fixed portion, 50c Contact surface, 50d ... second contact portion, 60 ... barrier fixing member, 61 ... insulating barrier, 101 ... mounting base, 102 ... left fixing frame, 103 ... right fixing frame, 104 ... upper support lever, 105 ... lower support Insulator, 107 ... fixed electrode, 108 ... power supply side connection terminal, 109 ... fuse support, 110 ... upper fuse clamping metal fitting, 111 ... lower fuse clamping metal fitting, 112 ... load side connection terminal, 114 ... movable electrode, 114a ... belly part , 115 ... shaft, 117 ... driven lever, 119 ... current limiting fuse, 120 ... fusing display device, 121 ... push-up bar, 122 ... operation handle, 123 ... operation shaft, 130 ... arc extinguishing chamber, 131 ... front, 132 ... bottom surface DESCRIPTION OF SYMBOLS 133 ... Opening part, 133c ... Inclination part, 134 ... Upper surface, 135 ... Side surface, 136 ... Rib, 137 ... Fixing part, 138 ... Screw, 140 ... Buffer part , 141 ... collision part, 141a ... collision surface, 142 ... gripping part, 142a ... fixing part, 143 ... bolt, 144 ... nut, 145 ... cylindrical tube, 146 ... opening hole, 151 ... first convex part, 152 ... second Convex part, 153... Third convex part, 154 ... Fourth convex part, 155 ... Fifth convex part, 156 ... Sixth convex part, 157 ... Seventh convex part.

Claims (9)

A fixed electrode, a movable electrode rotatable with respect to the fixed electrode, and an arc extinguishing chamber that covers the fixed electrode and has an opening into which the movable electrode can be inserted,
A power distribution device that is closed when the movable electrode contacts the fixed electrode, and is opened when the movable electrode is separated from the fixed electrode;
A buffer member attached to the arc extinguishing chamber and provided on an extension of the movable range of the movable electrode;
The said buffer member is provided in the position which collides with the said movable electrode when the said movable electrode at the time of injection | throwing exceeds at least the contact position which contacts the said fixed electrode. The power distribution device according to claim 1, wherein the buffer member protrudes toward a side away from the arc-extinguishing chamber in a rotation direction of the movable electrode. The power distribution device according to claim 1, wherein a collision surface of the buffer member that collides with the movable electrode is formed in parallel with a collision surface of the movable electrode that collides. The power distribution device according to claim 1, wherein the buffer member includes a convex portion that covers a portion on an extension line of a movable range of the movable electrode in the opening of the arc extinguishing chamber. The power distribution device according to claim 1, wherein the buffer member is attached in a state of covering an outer surface of the arc extinguishing chamber. The buffer member includes a collision portion that collides with the movable electrode;
A gripping part extending from both ends of the collision part to grip the arc extinguishing chamber;
The power distribution device according to claim 1, further comprising: a fixing portion that is provided at a distal end portion of the gripping portion and is fixed to the arc extinguishing chamber. A step portion is provided on the outer surface of the arc extinguishing chamber,
The power distribution apparatus according to claim 1, wherein the buffer member is supported by the stepped portion. The power distribution device according to claim 1, wherein the buffer member includes a contact portion that contacts a support member that supports the arc extinguishing chamber. The buffer member as the first buffer member,
The power distribution device according to claim 1, wherein the movable electrode includes a second buffer member that contacts the buffer member when at least the contact position is exceeded.