JPH0511283U - Multi-pole circuit breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] A multi-pole circuit breaker that prevents the contact arm's support shaft from contacting the base bulkhead to secure an insulation distance by the support shaft between poles and improve insulation performance. provide. [Structure] Circuit breaker case 1 having multiple poles and mechanism pole 1A having an opening / closing operation mechanism 23 arranged in the case 1
And another pole 1B having no opening / closing operation mechanism, which is also arranged in the case 1, and a crossbar 1 arranged penetrating each pole.
5, the first contact arm 10a of each pole held by the crossbar 15, the first contact arm 10a and the support shafts 12A and 12B, and the poles are rotatably supported by the case 1 at each pole. Second contact arm 10b and each second contact arm 10b
And the movable contactors 7 respectively supported by the shafts 12A and 12B, and the support shafts 12A and 12B of the respective poles are prevented from contacting from both sides of the partition wall 16.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an improvement of a multi-pole circuit breaker.

[0002]

[Prior Art]

 3 to 8 are views showing a conventional multi-pole circuit breaker disclosed, for example, in Japanese Utility Model Laid-Open No. 63-182449. FIG. 3 is a front view and FIG. 4 is a line IV-IV of FIG. FIG. 5 is a sectional view, FIG. 5 is a main portion view of FIG. 4 showing an off state, FIG. 6 is the same view as FIG. 5 showing a trip state, FIG. 7 is a main portion sectional view of line VII-VII of FIG. 3, and FIG. 7 is a partially exploded view of FIG.

In the figure, reference numeral 1 is a circuit breaker case composed of a base 1a and a cover 1b, and has a mechanical pole 1A having an opening / closing operation mechanism and adjacent poles 1B, 1B having no opening / closing operation mechanism. Reference numeral 2 is a fixed conductor on the power source side fixed to the base 1a, 3 is a fixed contact fixed to the fixed conductor 2, 4 is an automatic tripping device, and although not shown, for example, a thermal electromagnetic or electronic mechanism is arranged. . 5 is a fixed conductor on the load side connected to the automatic tripping device 4, 6 is a movable contact, 7 is a movable contactor to which the movable contact 6 is fixed, 8 is an automatic tripping device from the movable contactor 7 via the connecting conductor 9. A flexible conductor 10 for connecting to 4 is a contact arm that holds the movable contact 7, and the movable contact 7 and the first contact arm 10a to which an opening / closing operation mechanism described later is connected are connected by the first pin 11. It is divided into a second contact arm 10b that is rotatably supported. Reference numerals 12a and 12b denote support shafts that rotatably support the first contact arm 10a and the second contact arm 10b, respectively. The support shaft 12a of the mechanical pole 1A has both end portions in the respective support holes 13a of the mechanical frame 13. Both ends of the supporting shaft 12b of the adjacent pole 1B are held in the bearing holes 14a of the bearing member 14. Reference numeral 15 is a crossbar that connects the first contact arms 10a of the respective poles, and is inserted into the hole 16a of the partition wall 16 of the base 1a. Reference numeral 17 is a guide hole provided in the first contact arm 10a and extending in the opening / closing direction, and 18 is a long hole provided in the second contact arm 10b, which extends in a direction intersecting with the guide hole 17. Reference numeral 19 is a second pin that extends over the guide hole 17 and the long hole 18, and 20 is a tension spring provided between the first pin 11 and the second pin 19. Energize. Reference numeral 21 is a contact pressure spring provided between the movable contact 7 and the second contact arm 10b.

Reference numeral 22 is an operation handle of the circuit breaker, and 23 is an opening / closing operation mechanism of the circuit breaker, which includes a cradle 23a, an upper link 23b, a lower link 23c, and the like. Reference numeral 24 is a stopper pin provided on the cradle 23a, 25 is a connecting pin for connecting the lower link 23c to the first contact arm 10a, 26 is a clasp for engaging the cradle 23a and positioning the cradle 23a, 27 Is a latch center axis of the rake 26, 28 is a latch lever that engages the rake 26 and stops the rake 26 from being rotated by the cradle 23a, 29 is a center axis of the latch lever 28, and 30 is a latch lever 28. A trip bar that engages with the latch lever 28 to prevent the latch lever 28 from disengaging from the scraper 26, the central axis of rotation of the trip bar 30, and 32, the trip rod of the automatic trip device 4, which extends when tripping. Rotate the -30 against the double torsion spring (not shown).

Next, the operation will be described. In the ON state shown in FIGS. 3 and 4, the fixed conductor 2 on the power supply side → the fixed contact 3 → the movable contact 6 → the movable contact 7 → the flexible conductor 8 → the connecting conductor 9 → the automatic tripping device 4 → the fixed conductor 5 on the load side Current flows in the direction. When the operation handle 22 is turned off (in the direction of arrow 33 in FIG. 4), the contact arm 10 is lifted by the opening / closing operation mechanism 23, and the movable contact 7 and the movable contact 6 are fixed contact as shown in FIG. Open by 3. At this time, since the second pin 19 is fitted in the concave portion 17a of the guide hole 17 by the pulling spring 20, the second contact arm 10b is integrated with the first contact arm 10a and the opening / closing operation mechanism 23 is formed. It is lifted by and is stopped by colliding with the stopper pin 24 with the support shaft 12a as a fulcrum. In the ON state of FIG. 4 and the OFF state of FIG. 5, since the trip rod 32 of the automatic trip device 4 does not extend, the cradle 23a is fixed by the trip relay mechanism.

Next, when an overcurrent flows in the ON state shown in FIGS. 3 and 4, the automatic trip device 4 operates and the trip rod 32 extends, so that the trip bar 30 resists the double torsion spring. When it is rotated clockwise and released from the latch lever 25, the latch lever 25 can be rotated clockwise and the flipping force of the cradle 20a causes the blade 26 to rotate clockwise against the double torsion spring. At this time, the latch lever 28 is also rotated clockwise by the blade 26 against the double torsion bar. Since the opening / closing operation mechanism 23 is operated by the rotation of the cradle 20a, the contact arm 10 is lifted and the movable contact 6 is opened as shown in FIG. 6 to interrupt the overload current. This is a so-called trip state. At this time as well, the second pin 19 is fitted in the recess 17a of the guide hole 17 by the pulling spring 20 as in the OFF state of FIG. 5, so that the second contact arm 10b is integrated with the first contact arm 10a. Then, it is lifted up by the opening / closing operation mechanism 23 and collides with the stopper pin 24 about the support shaft 12a as a fulcrum to stop.

[0007]

[Problems to be solved by the device]

 In the conventional multi-pole circuit breaker as described above, in the mechanical pole 1A, the support shaft 12a is inserted and held in each support hole 13a of the mechanism frame 13, and in the adjacent pole 1B, the support shaft 12b is provided in each bearing member 14. Since the support shafts 12a, 12b slide axially and come into contact with the partition wall 16 as shown in FIG. 7, since they are inserted and held in the bearing hole 14a, the gap between the mechanical pole 1A and the adjacent pole 1B is reduced. The creepage insulation distance is indicated by the arrow 34, and a sufficient insulation distance cannot be secured, resulting in a problem of lack of reliability.

The present invention has been made in order to solve such a problem, and prevents the contact arm from contacting the support arm support shaft with the base partition wall, thereby ensuring an insulation distance by the support shaft between the poles. It is an object of the present invention to obtain a multi-pole circuit breaker capable of improving

[0009]

[Means for Solving the Problems]

 A multi-pole circuit breaker according to the present invention includes a circuit breaker case having multi-poles, a mechanism pole having an opening / closing operation mechanism arranged in the case, and a switch pole having no opening / closing operation mechanism also arranged in the case. Poles, crossbars penetrating the poles, first contact arms of the poles held by the crossbars, first contact arms, and poles of the poles. In the mechanical pole, there are second contact arms rotatably supported by the case and movable contacts respectively supported by the second contact arms. Are inserted and retained in the support holes of the mechanism frames on both sides, and both ends should not touch the partition walls of the case when the mechanism frame is attached to the circuit breaker case. In addition, at the other pole, both ends of the support shaft are inserted and retained in the bearing holes of the bearing members on both sides, and the end of the support shaft on the mechanism pole side does not contact the partition wall. It is the one.

[0010]

[Action]

 In this invention, since the support shaft of each pole does not contact from both sides of the partition wall, the insulation distance through the partition hole can be secured.

[0011]

【Example】

 An embodiment of this invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a main part showing a supporting shaft portion, and FIG. 2 is a partially exploded view of FIG. In the figure, 12A is a spindle of the mechanical pole 1A, and has thin shaft portions 12c at both ends. 12B is a support shaft of the adjacent pole 1B, and has a large diameter portion 12d at one end.

When the support shaft 12A is inserted between the mechanism frames 13 and the thin shaft portions 12c at both ends are fitted in the respective support holes 13a, when the mechanism frame 13 is attached to the base 1a, as shown in FIG. The end of the shaft 12A does not contact the partition wall 16. When the support shaft 12B is inserted from the outside of the bearing member 14 and the large diameter portion 12d is engaged with the outside of the bearing member 14, the bearing member 14 is attached to the base 1a as shown in FIG. The end of the shaft 12B does not contact the partition wall 16. Since the support shafts 12A and 12B of the respective poles do not come into contact with each other from both sides of the partition wall 16 in this assembled state, the insulation distance through the hole 16a of the partition wall 16 can be secured.

[0013]

[Effect of the device]

 As described above, according to the present invention, it is possible to improve the insulation performance by preventing the contact arm from contacting the support arm spindle with the base partition wall, thereby ensuring the insulation distance between the poles. .

[Submission date] December 19, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

Next, when an overcurrent flows in the ON state shown in FIGS. 3 and 4, the automatic trip device 4 operates and the trip rod 32 extends, so that the trip bar 30 resists the double torsion spring. Te when the outer being from the latch lever 28 is rotated in the clockwise direction, rotates in the clockwise direction against clasp 26 is a double torsion spring latch lever 28 by the sounds up force of cradle 20a is rotatable in a clockwise direction At this time, the latch lever 28 is also rotated clockwise by the blade 26 against the double torsion bar. Since the opening / closing operation mechanism 23 is operated by the rotation of the cradle 20a, the contact arm 10 is lifted and the movable contact 6 is opened as shown in FIG. 6 to interrupt the overload current. This is a so-called trip state. At this time as well, the second pin 19 is fitted into the recess 17a of the guide hole 17 by the pulling spring 20 as in the off state of FIG. 5, so that the second contact arm 10b is integrated with the first contact arm 10a. Then, it is lifted up by the opening / closing operation mechanism 23 and collides with the stopper pin 24 about the support shaft 12a as a fulcrum to stop.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a partially exploded view of FIG.

FIG. 3 is a front view showing a conventional one.

4 is a cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a main part diagram of FIG. 4 showing an off state.

FIG. 6 is the same view as FIG. 5 showing a trip state.

7 is a cross-sectional view of the main part taken along the line VII-VII of FIG.

FIG. 8 is a partially exploded view of FIG.

[Explanation of symbols]

 1 Circuit Breaker Case 1A Mechanism Pole 1B Other Pole 4 Automatic Tripping Device 7 Moving Contact 10a First Contact Arm 10b Second Contact Arm 12A, 12B Spindle 13 Mechanism Frame 13a Support Hole 14 Bearing Member 14a Bearing Hole 15 Crossbar 16 Partition 23 Opening / closing operation mechanism

Claims (1)

Claims for utility model registration: 1. A circuit breaker case having multiple poles, a mechanism pole having an opening / closing operation mechanism arranged in the case, and an opening / closing operation mechanism also arranged in the case. A crossbar disposed through the poles, a first contact arm of each pole held by the crossbar, and a first contact arm of each crossbar. A second contact arm rotatably supported by the case at each pole by a support shaft and a movable contactor supported by each second contact arm are provided. By using the first and second contact arms, the movable contact is separated from each other by the electromagnetic repulsive force due to the large-current energization at each pole, regardless of the interruption operation by the automatic tripping device, and the current limiting is achieved. In the mechanical pole, the both ends of the support shaft are inserted into and held in the respective support holes of the mechanism frames on both sides, and the both ends of the mechanical frame serve as the circuit breaker. In the state where it is attached to the case, it does not come into contact with the respective partition walls of the case, and at the other pole, both ends of the support shaft are inserted and held in the bearing holes of the bearing members on both sides, respectively. A multi-pole circuit breaker, characterized in that an end of the support shaft on the side of the mechanical pole is prevented from coming into contact with the partition wall.