Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/50—Manual reset mechanisms which may be also used for manual release
  • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/50—Manual reset mechanisms which may be also used for manual release
  • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
  • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
  • H01H71/525—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee

Definitions

• the present invention relates to a circuit breaker in which a handle is prevented from moving to an open circuit position when a movable contact and a fixed contact of the circuit breaker are welded.
• FIG. 11 is a cross-sectional view showing a conventional circuit breaker disclosed in, for example, Japanese Utility Model Publication No. 1-242286.
• 1 is a cover
• 2 is a base
• both are made of synthetic resin.
• Reference numeral 3 denotes a housing composed of the cover 1 and the base 2
• reference numeral 4 denotes a fixed contact fixed to the base 2, which has a terminal portion 5 at one end so that an external conductor (not shown) can be connected thereto.
• a fixed contact 6 is provided on the upper surface of the end.
• An arc extinguishing device 13 extinguishes the arc generated between the contacts 6 and 8.
• a plurality of arc extinguishing magnetic plates 15 are arranged inside a pair of arc extinguishing side plates 14.
• 16 is a lower link pivotally supported at one end by a movable contact arm 9 on a shaft 17, and 18 is a shaft 2 at one end at the other end of the lower link 16 and the other end at a cradle 19.
• the upper link is rotatably supported by 0 and 21.
• 2 2 is the lower link
• a toggle link mechanism comprising an upper link 18, an upper link 18 and an axis 20, and the axis 20 is an elbow.
• Reference numeral 23 denotes a handle arm whose one end (not shown) is rotatably supported at a predetermined position with respect to the toggle link mechanism 22.
• Reference numeral 24 denotes one end of the handlebar through a spring hook pin 25.
• 2 7 is a pie metal connected to the movable contact
• 2 8 is a fixed iron core fixed to the pie metal
• 2 7 9 is a movable iron core arranged to face the fixed iron core 28,
• 30 is
• a rotatable trip bar 31 to which the movable iron core 29 is fixed is a rotatable latch, one of which is always locked to the cradle 19 and the other of which is always locked to the tripper 30.
• Reference numeral 2 denotes a cradle shaft that rotatably supports the cradle 19, and 33 denotes a stopper that locks the cradle 19 during tripping, and is engaged with and fixed to the frame 34.
• the frame 34 also supports a fulcrum for positioning the cradle shaft 32 and rotating the latch 31 described above.
• Fig. 12 where the contacts are open, the handle 26 can be moved to the closed position (tilt right) with the cradle 19 locked by the latch 31 and the toggle link fence 2 2 is extended, and the movable contact 8 is brought into contact with the fixed contact 6, and the closed state shown in FIG. 11 is established.
• the toggle link mechanism 22 is bent, and the movable contact 8 is separated from the fixed contact 6, resulting in the open state shown in FIG.
• the noy metal 27 or the movable iron core 29 operates and the engagement between the cradle 19 and the latch 31 is released.
• the cradle 19 is rotated clockwise about the cradle shaft 32 (see FIG. 13). Therefore, the connection point between the cradle 19 and the upper link 18, that is, the point of the shaft 21, forms the action line of the toggle spring 24. As a result, the toggle link mechanism 22 is bent by the spring force of the toggle spring 24, and the movable contacts 8 are separated from the fixed contacts 6 for all the poles by the crossbar 12 in conjunction with each pole. Thus, the trip state shown in FIG. 13 is obtained.
• circuit breaker disclosed in Japanese Patent Publication No. Hei 11-1991 / 76, which uses an open / close lever (corresponding to a handle arm) and a movable contact device when welding is performed between the contacts. Are engaged so that the handle cannot move to the open position.
• the handle when the movable contact is welded in a closed state due to an abnormal current, the handle can be prevented from moving to the open position, but the handle arm is moved to the movable contact device. There is a problem that the handle arm is enlarged because it is directly engaged with the steering wheel.
• the present invention has been made to solve the above-described problem, and when a movable contact and a fixed contact are welded, the handle cannot be moved to an open circuit position, and the handle arm has a relatively small size. It is intended to be compact.
• a fixed contact In the circuit breaker according to the present invention, a fixed contact, a movable contact opposed to and separated from the fixed contact inside the insulated housing composed of the base and the cover, and driving the movable contact
• the toggle link mechanism is provided with a blocking portion that engages with the handle arm when the fixed contact and the movable contact are welded to prevent the handle from moving to the open position. As a result, the handle can be prevented from moving to the open position, and the handle arm can be formed relatively small.
• the blocking portion is provided on the handle side link of the toggle link mechanism, and is a force portion that engages with the handle arm when the fixed contact and the movable contact are welded to prevent the handle from moving to the open position. . This makes it possible to prevent the handle from moving in the direction of the open position, and to make the handle arm relatively small.
• the blocking portion that engages with the handle arm of the handle-side link of the toggle link mechanism is formed by an arc-shaped cam portion centered on the fulcrum of the handle-side link.
• the cam portion engaged with the handle arm of the handle side link is engaged with the handle arm in the first half of this movement process.
• the bending engagement portion of the handle arm engages with the second cam portion of the handle side link, Since the connecting portion between the handle side link and the movable contact side link is bent quickly, the operation of the route is more reliable.
• the movable contact is pulled up by the moment acting in the clockwise direction to open the contacts. Further, by moving and engaging the first cam portion, the handle is prevented from further moving in the open circuit position direction I.
• the cam portion that engages with the handle arm of the handle-side link is formed by the first arc-shaped cam portion centered on the fulcrum of the handle link, and the movable contact side link side from the fulcrum of the handle side link. It is formed by an arc-shaped second force part having a center.
• a fixed contact inside an insulating housing composed of a base and a cover, a movable contact facing and separating from the fixed contact, a crossbar connecting one end of the movable contact, and a movable contact.
• a handle arm rotatably supported at a predetermined position relative to the toggle link mechanism, a handle linked to the handle arm, and a toggle link in response to overcurrent.
• a circuit breaker equipped with a trip device that activates the mechanism a fixed contact between the crosspar and the handle arm When the fixed contact and the movable contact of the movable contact are welded to each other, they are engaged with each other between the crossbar and the handle arm to prevent the handle from moving to the open position.
• the handle can be prevented from moving in the direction of the open position, and the handle arm can be formed relatively small, and the stop can be applied to the strong crossbar, so that a somewhat excessive force is applied. Is strong without breaking even if it works o
• a twist spring is provided for constantly engaging the collar with the handle arm.
• FIG. 1 is a side sectional view showing a circuit breaker according to Embodiment 1 of the present invention, showing a closed state.
• FIG. 2 is a cross-sectional view of a main part when the circuit breaker of FIG. 1 is in an open circuit state.
• FIG. 3 is a side sectional view showing a main part when the circuit breaker of FIG. 1 is in a trip state.
• FIG. 4 is a side sectional view showing a state in which the handle is moved in the direction of the open circuit position in a state where the contacts of the circuit breaker in FIG. 1 are welded.
• FIG. 5 is a side sectional view showing a circuit breaker according to Embodiment 2 of the present invention.
• FIG. 6 is an enlarged side sectional view showing a state where the handle is moved in the direction of the open circuit position in a state where the contacts of the circuit breaker in FIG. 5 are welded.
• FIG. 7 is an enlarged side sectional view showing a state where the toggle link structure has moved from the state of FIG.
• FIG. 8 is a side sectional view showing a circuit breaker according to Embodiment 3 of the present invention, showing a closed state.
• FIG. 9 is a side cross-sectional view showing a state where the handle has been moved toward the open circuit position in a state where the contacts of the circuit breaker in FIG. 8 are welded.
• FIG. 10 is a side sectional view showing a circuit breaker according to Embodiment 4 of the present invention.
• FIG. 11 (1) is a side sectional view showing a conventional circuit breaker, showing a closed state.
• FIG. 12 is a side sectional view showing a conventional circuit breaker, showing an open circuit state.
• FIG. 13 is a side sectional view showing a conventional circuit breaker, showing a trip state.
• FIG. 14 is a side sectional view showing a conventional circuit breaker, showing a state in which the contacts are welded and the handle is moved to the open position.
• FIG. 1 is a side sectional view showing a circuit breaker according to Embodiment 1 of the present invention with a part cut away to show the inside thereof, showing a closed state.
• FIG. 2 is a cross-sectional view of a main part when the circuit breaker of FIG. 1 is in an open circuit state
• FIG. 3 is a cross-sectional view of a main part when the circuit breaker of FIG. 1 is in a trip state.
• 40 is a cover
• 41 is a base
• both are made of synthetic resin.
• Reference numeral 42 denotes a housing composed of the cover 40 and the base 41
• reference numeral 43 denotes a fixed contact fixed to the base 41, which has a fixed contact 43a.
• Reference numeral 4 4 is a movable contact having a movable contact 4 4 a opposed to the fixed contact 4 3 a And is rotatably supported by pivot pins 45.
• Reference numeral 46 denotes a crossbar made of an insulator connecting one end of each of the movable contacts 44 arranged side by side on all poles.
• a contact pressure spring 47 is interposed between the movable contact 44 and the cross bar 46 and constantly urges the movable contact 44 in the direction of the fixed contact 43a.
• Reference numeral 48 denotes a flexible conductor, one end of which is connected to the movable contact 44 and the other end of which is connected to a trip device (not shown).
• An arc extinguishing device 49 extinguishes an arc generated between the two contacts 43a and 44a.
• a plurality of magnetic extinguishing magnetic plates 51 are arranged inside a pair of arc extinguishing side plates 50. I have.
• the upper link 54 is provided with a blocking portion. ing. Specifically, the blocking portion is formed of a half g R arc-shaped cam portion 54 a centered on the center point of the shaft 57 serving as a fulcrum of the upper link 54.
• Reference numeral 58 denotes a toggle link mechanism including a lower link 52, an upper link 54, and a shaft 56, and the shaft 56 serving as an elbow.
• Reference numeral 59 denotes a handle arm, which has a bending engagement portion 59a, is rotatable to a predetermined relation position with respect to the toggle link mechanism 58, and one end 59b serves as a rotation fulcrum, and a frame (not shown) It is pivoted to.
• Reference numeral 60 denotes a toggle spring having one end suspended on the handle arm 59 via the spring retaining pin 61 and the other end suspended on the shaft 56, respectively.
• Reference numeral 62 denotes a handle which can be operated from the outside of the force par 40 and is made of synthetic resin, and is interlocked with the handle arm 59.
• Reference numeral 63 denotes a latch, which has a latch engaging portion 63 a that engages with the cradle 55, a recess 63 b into which the latch support shaft 64 fits, and a bow I removal device (not shown). Engage and rotate about the latch support shaft 64.
• 6 5 is a cradle support shaft pivotally supported by a frame (not shown), 6
• Reference numeral 6 denotes a storage tube for the upper link 54 and the movable contact 44.
• Fig. 4 shows a state in which, for example, a large pulsed current flows in a closed state and the engagement between the cradle 55 and the latch 63 is not released, and between the fixed contact 43a and the movable contact 44a. This shows the case where the welding phenomenon occurs and the movable contact 44a does not separate.
• the toggle link mechanism 58 is held at the closed position, and as shown in FIG. 4, the handle 62 is turned counterclockwise to the open side in order to open the circuit due to the necessity of maintenance and inspection.
• the toggle spring 60 is extended, and the handle arm 59 is also rotated counterclockwise to move in the open circuit direction. However, while the handle 62 is moving in the counterclockwise direction, the bending engagement portion 59 a of the handle arm 59 is maintained in the closed state. It collides with and engages with the cam portion 54a of the upper link 54 of the toggle link mechanism 58, which prevents the handle arm 59 from further moving toward the open circuit position.
• the bending engagement portion 59a of the handle arm 59 may collide with and engage with the lower link of the toggle link mechanism 58 maintained in a closed state.
• the blocking portion, specifically, the cam 54a and the bending engagement portion 59a of the handle arm 59 are collided and engaged with the toggle link mechanism 58, so that the movable contact is made as in the conventional case.
• the handle arm becomes smaller than the slave device and the handle arm colliding and engaging.
• FIG. 5 is a side sectional view showing a circuit breaker according to a second embodiment of the present invention with a part cut away to show the inside thereof.
• the handle In a state where the contacts of the circuit breaker are welded, the handle is moved in the direction of the open circuit position. Shows the state of movement.
• FIG. 6 is an enlarged side sectional view of a main part showing a state where the handle is moved in the direction of the open circuit position * in a state where the contacts of the circuit breaker of FIG. 5 are welded.
• reference numeral 100 denotes an upper link
• the shape of a cam portion which engages with the bending engagement portion 59 a of the handle arm 59 is a half-centered shape about the center point C 1 of the shaft 57.
• An arbitrary position separated from the center point C1 of the first cam portion 100a formed and the center point C1 of the shaft 57 by the dimension L to the lower link 52 side is set as a center point C2, and half of the center point C2.
• the second cam portion 100 b formed with the diameter R 2 is formed.
• the center point C1 and the axis 56 It is set at a position rotated clockwise by about 0 degrees with respect to the dashed line connecting the center point C3.
• the bending engagement portion 59 a of the handle arm 59 is connected to the upper link 1.
• the second opening 110 engages with the second cam portion 100 to bend the connecting portion between the upper link 100 and the lower link 52 quickly, so that the opening operation is more reliable.
• the upper link 100 is rotated in the bending direction, and the first cam portion 100a is engaged with the bent engagement portion 59a of the handle arm 59, whereby the upper link 100 is rotated. Rotates until the movable contact 44 is pulled up, but the handle 62 prevents movement from the position engaged with the cam portion 100a toward the open circuit position.
• FIG. 8 is a side sectional view showing a circuit breaker according to Embodiment 3 of the present invention with a part cut away to show the inside thereof, showing a closed state.
• 1 to 66 are the same as those in the first embodiment, and the description is omitted.
• Reference numeral 70 denotes a stopper, which is rotatably supported by a stud support shaft 65 of a cradle 55, an arm portion 70a is formed at one end, and a bending arm of a handle arm 59 is formed at the other end.
• a stop shaft 71 engaging with the joint portion 59a is fixed.
• FIG. 9 shows a state in which, for example, a large pulsed current flows in a closed state, and the engagement between the cradle 55 and the latch 63 is not released, and between the fixed contact 43a and the movable contact 44a.
• the toggle spring 60 is extended and the handle arm 5 is extended. 9 is also rotated counterclockwise and moved toward the open position (see Fig. 9).
• the shaft 71 which is in contact with the bending engagement portion 59a of the handle arm 59, is rotated in the counterclockwise direction.
• the arm 70a of the tongue 70 rotates counterclockwise to collide with and engage with the projection 46a of the strong crossbar 46 as a structure, and as shown in FIG. 5 to prevent further movement toward the open position.
• the handle arm becomes smaller than the conventional case where the movable contact device and the handle arm collide and engage with each other.
• FIG. 10 is a side view of a circuit breaker showing Embodiment 4 of the present invention
• reference numeral 72 denotes a torsion spring, which engages with the stopper shaft 71 so as to always contact the stopper shaft 71 with the bending engagement portion 59a of the handle arm 59, and the stopper spring 70 Is constantly biased clockwise.
• the urging force of the torsion spring 72 against the stop 70 is the clockwise urging force of the handle arm 59 and the handle 62.

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Priority Applications (6)

Applications Claiming Priority (1)

Publications (1)

Family

ID=14153043

Family Applications (1)

Country Status (6)

Cited By (6)

Families Citing this family (5)

Citations (9)

Family Cites Families (1)

• 1996
  • 1996-03-15 WO PCT/JP1996/000670 patent/WO1997035333A1/ja active IP Right Grant
  • 1996-03-15 EP EP96906042A patent/EP0827173B1/en not_active Expired - Lifetime
  • 1996-03-15 JP JP53332697A patent/JP3814671B2/ja not_active Expired - Lifetime
  • 1996-03-15 DE DE69636639T patent/DE69636639T2/de not_active Expired - Fee Related
  • 1996-03-15 KR KR1019970707836A patent/KR100336946B1/ko not_active IP Right Cessation
  • 1996-06-10 TW TW085106938A patent/TW353756B/zh active

Patent Citations (9)

Non-Patent Citations (1)

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