JP2020004560A - Circuit breaker - Google Patents

Abstract

To provide a circuit breaker capable of simplifying the structure of a link member enabling transmission of power from a handle to a separator.SOLUTION: A circuit breaker 10 includes a separator 60, a handle 70, and a link member 80. The link member displaces the separator 60 by transmitting the control force of the handle 70 to the separator 60. The link member 80 has a tabular coupling plate 81, a first coupling pin 82, and a second coupling pin 83. The first coupling pin 82 is provided at one end of the coupling plate 81, and has arm parts 820, 821. The second coupling pin is provided at the other end of the coupling plate, and has arm parts 830, 831. The handle 70 has an insertion part 72 into which the arm parts 820, 821 of the first coupling pin 82 are inserted. The separator 60 is in contact with the arm parts 830, 831 of the second coupling pin 83.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to circuit breakers.

  A conventional circuit breaker is operated by a user, including a plurality of fixed contacts, a plurality of movable contacts provided corresponding to each of the plurality of fixed contacts, a separator holding the plurality of movable contacts, and a user. With a handle. The handle is connected to the separator via a link member. More specifically, one end of the link member is connected to the handle. The other end of the link member is in contact with the separator. In this circuit breaker, when the handle is operated to the ON position, the operating force is applied to the separator via the link member, whereby the separator is displaced from the first position to the second position, and the movable contact is moved. Press. As a result, the movable contact contacts the fixed contact, and the circuit breaker is turned on. When the handle is operated to the off position, the operation force applied to the separator from the handle via the link member is released, and the separator returns from the second position to the first position. As a result, the movable contact is separated from the fixed contact, and the circuit breaker is turned off.

  On the other hand, as the above link member, for example, there is a link member described in Patent Document 1 below. The link member described in Patent Literature 1 includes a pair of plate members, and a first pin and a second pin that connect the pair of plate members at predetermined intervals. A handle is connected to the first pin. The second pin is in contact with the separator. The link member described in Patent Literature 1 has a structure in which a second pin of the link member presses the separator based on operation of a handle.

JP-A-9-102261

  By the way, when a link member as described in Patent Literature 1 is used, a pair of plate members is required, so that the material yield may be deteriorated. In addition, when connecting a pair of plate members with the first pin and the second pin, it is necessary to control the parallelism of each plate member, the dimension of the width formed between the pair of plate members, and the like. There is a possibility that adverse effects such as deterioration and complicating quality control may occur.

  The present disclosure has been made in view of such circumstances, and an object thereof is to provide a circuit breaker that can simplify the structure of a link member that enables transmission of power from a handle to a separator. It is in.

  A circuit breaker that solves the above problem can connect and disconnect an electric path between a power supply side terminal and a load side terminal by contact and separation of a fixed contact and a movable contact housed inside a housing. A circuit breaker including a handle, a separator, and a link member. The handle is operable in an on position and an off position. The separator holds the movable contact in a state separated from the fixed contact by being located at the holding position when the handle is operated to the off position, while the separator is operated when the handle is operated from the off position to the on position. The movable contact is displaced from the holding position to the pressing position to press the movable contact, thereby bringing the movable contact into contact with the fixed contact. The link member displaces the separator to the holding position and the pressing position by transmitting the operating force of the handle to the separator. The link member has a plate-shaped connecting plate, a first connecting pin, and a second connecting pin. The first connecting pin is provided at one end of the connecting plate, and is provided so as to protrude from one side surface of the connecting plate. It has a second arm portion provided so as to protrude. The second connecting pin is provided at the other end of the connecting plate, and is provided with a third arm portion provided to protrude from one side surface of the connecting plate, and the other side surface of the connecting plate coaxially arranged with the third arm portion. And a fourth arm portion provided so as to protrude therefrom. The handle has an insertion portion into which the first arm portion and the second arm portion of the first connection pin are inserted. The separator is in contact with the third arm portion and the fourth arm portion of the second connecting pin.

  According to this configuration, if the first connection pin and the second connection pin are provided at both ends of the connection plate, the handle is connected to the first connection pin, and the second connection pin is brought into contact with the separator. Power can be transmitted from the handle to the separator via the link member. Further, since only one plate member needs to be used as the connecting plate of the link member, it is not necessary to use a pair of plate members unlike a conventional circuit breaker. Therefore, the structure of the link member can be simplified.

  In the above circuit breaker, the handle is provided so as to separate the insertion portion into the first insertion portion and the second insertion portion, and further has a handle notch portion into which one end of the connection plate is inserted, It is preferable that the first arm portion is rotatably inserted into the one insertion portion, and the second arm portion is rotatably inserted into the second insertion portion.

According to this configuration, the link member can be rotatably supported by the handle.
In the above circuit breaker, the separator preferably has a separator notch for avoiding interference with the other end of the connecting plate.

According to this configuration, it is possible to prevent the operation of the link member from being hindered by the separator.
It is preferable that the circuit breaker further includes a latch piece that is displaced when an overcurrent flows in the electric circuit, and a trip arm that is displaced based on the displacement of the latch piece. The trip arm is arranged close to the separator when overcurrent does not flow through the electric circuit, thereby restricting the movement of the second connection pin. Based on the displacement, the force applied to the separator from the link member is released by releasing the restriction of the movement of the second connection pin by displacing the separator from the separator. When the force applied to the separator from the link member is released, the movable contact is separated from the fixed contact by the displacement of the separator from the pressing position to the holding position. The trip arm has a trip arm notch for avoiding interference with the other end of the connecting plate.

  According to this configuration, it is possible to prevent the operation of the link member from being hindered by the trip arm.

  According to the present disclosure, it is possible to provide a circuit breaker that can simplify the structure of a link member that enables transmission of power from a handle to a separator.

FIG. 1 is a cross-sectional view illustrating a cross-sectional structure of the circuit breaker according to the embodiment. FIG. 2 is a cross-sectional view illustrating an operation example of the circuit breaker according to the embodiment. FIG. 3 is a perspective view illustrating a perspective structure of the link member according to the embodiment. FIG. 4 is a perspective view showing a partial perspective structure of the circuit breaker of the embodiment.

Hereinafter, an embodiment of a circuit breaker will be described with reference to the drawings. To facilitate understanding of the description, the same components are denoted by the same reference numerals as much as possible in each drawing, and redundant description will be omitted.
The circuit breaker 10 of the present embodiment shown in FIG. 1 is a circuit breaker arranged on a single-phase three-phase electric circuit or the like. As shown in FIG. 1, the circuit breaker 10 of the present embodiment includes a power supply side terminal 31 provided to be exposed to the outside on a left side wall 21 of a housing 20, and an external terminal on a right side wall 22 of the housing 20. And a load-side terminal 41 provided to be exposed. In FIG. 1, the illustration of the upper lid of the housing 20 is omitted. The power supply side terminal 31 is connected to a power supply side wiring. The load side wiring is connected to the load side terminal 41. The circuit breaker 10 switches between a state in which the power supply side terminal 31 and the load side terminal 41 are electrically connected and a state in which the connection is cut off, so that the power supply side wiring and the load side wiring can be connected. Is a device that can switch the electrical connection state of the device.

  The circuit breaker 10 includes a fixed contact 30 provided with a power supply terminal 31 at one end, a load terminal fitting 40 provided with a load terminal 41 at one end, and a movable contact 50 provided inside the housing 20. , A separator 60 for holding the movable contact 50, and a handle 70 provided to protrude from the upper surface of the upper cover of the housing 20.

  The fixed contact 30 is made of a conductive metal member. The fixed contact 30 is disposed so as to extend from the power supply terminal 31 to the inside of the housing 20, and is fixed to the housing 20. A fixed contact 32 is provided at an end of the fixed contact 30 extending into the housing 20 so as to face the movable contact 51 of the movable contact 50.

  The movable contact 50 is made of a flat metal member having conductivity. A movable contact 51 is provided at the tip of the movable contact 50. The movable contact 50 is arranged such that its upper surface is in contact with the inner wall surface of the insertion hole 61 formed in the separator 60. A protrusion 53 into which one end of the coil spring 52 is inserted is formed on the bottom surface of the movable contact 50. The other end of the coil spring 52 is inserted into an insertion portion formed inside the housing 20. The coil spring 52 is inserted between the insertion portion of the housing 20 and the movable contact 50 in a compressed state. The coil spring 52 presses the movable contact 50 against the inner wall surface of the separator 60. As a result, the movable contact 50 is held in a state of being in contact with the inner wall surface of the separator 60.

  The movable contact 50 is electrically connected to the lower end of the electromagnetic coil 91 through a wiring (not shown). One end of the load-side terminal fitting 40 is electrically connected to the upper end of the electromagnetic coil 91. That is, the movable contact 50 is electrically connected to the load-side terminal fitting 40 via the electromagnetic coil 91.

  The handle 70 has a rotating shaft 71 fixed to the housing 20. The handle 70 is swingably supported about an axis of rotation 71 at an OFF position shown in FIG. 1 and an ON position shown in FIG. That is, the handle 70 is operable between an off position shown in FIG. 1 and an on position shown in FIG. A cylindrical insertion part 72 is formed at one end of the handle 70 inserted into the housing 20. A link member 80 is connected to the insertion section 72.

Specifically, as shown in FIG. 3, the link member 80 includes a flat connecting plate 81 made of a single plate, a first connecting pin 82 provided at one end of the connecting plate 81, and a connecting plate 81. And a second connection pin 83 provided at the other end of the second connection pin.
The first connection pin 82 is formed in a column shape around the axis m <b> 1, and is inserted into a through hole 810 formed at one end of the connection plate 81. The first connection pin 82 having such a structure is provided with an arm 820 provided to protrude from one side of the connection plate 81, and is disposed coaxially with the arm 820 and protrudes from the other side of the connection plate 81. Arm portion 821 provided as described above. In the present embodiment, the arm 820 corresponds to a first arm, and the arm 821 corresponds to a second arm.

  The second connection pin 83 is formed in a column shape around the axis m <b> 2, and is inserted into a through hole 811 formed at the other end of the connection plate 81. The second connection pin 83 having such a structure is provided with an arm 830 provided to protrude from one side of the connection plate 81, and arranged coaxially with the arm 830 to protrude from the other side of the connection plate 81. Arm portion 831 provided as described above. In the present embodiment, the arm 830 corresponds to a third arm, and the arm 831 corresponds to a fourth arm.

  As shown in FIG. 4, a notch 73 into which one end of the connection plate 81 is inserted is formed at a central portion in the axial direction of the insertion portion 72. In the present embodiment, the notch 73 corresponds to a handle notch. The insertion portion 72 is separated into a first insertion portion 720 and a second insertion portion 721 by the notch portion 73. The arm portion 820 of the link member 80 is rotatably inserted into the first insertion portion 720. The arm portion 821 of the link member 80 is rotatably inserted into the second insertion portion 721. One end of the link member 80 is rotatably connected to the handle 70 by the connection between the insertion portion 72 and the first connection pin 82 of the link member 80.

One end of the first connection pin 82 is inserted into a guide groove 121 formed in the frame 120. The frame 120 is fixed to the housing 20. The guide groove 121 guides the movement of the first connecting pin 82 when the link member 80 is displaced with the swing of the handle 70.
As shown in FIG. 1, the second connection pin 83 provided at the other end of the link member 80 is in contact with the upper end face 62 of the separator 60. More specifically, as shown in FIG. 4, the arm portions 830 and 831 of the second connection pin 83 are in contact with the one end surface 62 of the separator 60. The link member 80 transmits the operating force transmitted from the handle 70 via the first connection pin 82 to the separator 60 via the second connection pin 83, thereby moving the separator 60 from the holding position shown in FIG. Is displaced to the pressing position shown in FIG.

  The separator 60 is formed of an insulating material such as a resin. As shown in FIG. 4, the separator 60 is formed in a substantially rectangular parallelepiped shape. An insertion hole 61 through which the movable contact 50 is inserted is formed in the separator 60. As shown in FIG. 1, an insertion portion 63 into which the second connection pin 83 is inserted is formed on one end surface 62 of the separator 60 where the second connection pin 83 of the link member 80 contacts. The insertion portion 63 is formed such that the cross-sectional shape orthogonal to the one end surface 62 of the separator 60 has a substantially concave shape.

As shown in FIG. 4, a notch 66 is formed in the side wall 64 of the separator 60 in the X1 direction to avoid interference with the connecting plate 81 of the link member 80. In the present embodiment, the notch 66 corresponds to the separator notch.
As shown in FIG. 1, a trip arm 110 is arranged close to the side wall portion 65 of the separator 60 in the X2 direction. The trip arm 110 is disposed so as to close an opening of the insertion portion 63 of the separator 60 on the X2 direction side. The contact of the second connecting pin 83 of the link member 80 with the trip arm 110 prevents the second connecting pin 83 from dropping from the insertion portion 63 of the separator 60. That is, the trip arm 110 regulates the movement of the second connecting pin 83. The trip arm 110 is connected to a rotation shaft 71 of the handle 70, and is supported so as to be rotatable about the rotation shaft 71. As shown in FIG. 4, a notch 111 is formed in the trip arm 110 to avoid interference with the connecting plate 81 of the link member 80. In the present embodiment, the notch 111 corresponds to a trip arm notch.

  In the circuit breaker 10, when the handle 70 is operated from the off position shown in FIG. 1 to the on position shown in FIG. 2, the operating force of the handle 70 is applied to one end face of the separator 60 via the link member 80. By being given to 62, separator 60 is displaced downward. The movable contact 50 is pressed downward by the displacement of the separator 60. When the handle is operated to the ON position shown in FIG. 2, the handle 70, the link member 80, and the separator 60 are held at the positions shown in FIG. As a result, the movable contact 51 of the movable contact 50 is kept in contact with the fixed contact 32 of the fixed contact 30. That is, the electric circuit between the power supply terminal 31 and the load terminal 41 is connected. The contact pressure between the movable contact 51 of the movable contact 50 and the fixed contact 32 of the fixed contact 30 is secured by the urging force applied to the movable contact 50 from the coil spring 52. That is, the coil spring 52 functions as a contact pressure spring.

  When the handle is operated from the on position shown in FIG. 2 to the off position shown in FIG. 1, the handle 70 returns to the position shown in FIG. At this time, the movable contact 50, the separator 60, and the link member 80 return to the positions shown in FIG. Thereby, the movable contact 51 of the movable contact 50 is separated from the fixed contact 32 of the fixed contact 30, so that the electric path between the power supply terminal 31 and the load terminal 41 is cut off.

  As shown in FIG. 1, the circuit breaker 10 further includes a magnetic trip device 90 housed inside the housing 20. The magnetic trip device 90 separates the movable contact 50 from the fixed contact 30 when an overcurrent flows through the circuit breaker 10 in a state where the handle 70 is operated to the ON position. This is a device for performing a so-called trip operation for interrupting an electric circuit between the load terminal 31 and the load-side terminal 41. The magnetic trip device 90 includes an electromagnetic coil 91, a movable magnetic piece 92, an oil dash pot 93, and a yoke 94.

The electromagnetic coil 91 is arranged on the outer periphery of the oil dash pot 93. The electromagnetic coil 91 forms magnetism based on a current flowing therethrough, that is, a current flowing from the movable contact 50 toward the load terminal 41.
The movable magnetic piece 92 is formed in the shape of a letter “H”. One side 920 of the movable magnetic piece 92 faces the upper surface 930 of the oil dash pot 93. The other side 921 of the movable magnetic piece 92 faces the latch piece 100. The movable magnetic piece 92 is rotatably supported at a corner 922 which is a connection portion between one side 920 and the other side 921. Also, the movable magnetic piece 92 is separated from the upper surface 930 of the oil dash pot 93 by the biasing force applied from a coil spring (not shown) at the position shown in FIG. It is held at a position that is separated from 100.

  The yoke 94 is formed in a substantially L-shape. An oil dash pot 93 is fixedly attached to one end of the yoke 94. The other end of the yoke 94 is fixed to the housing 20. That is, the oil dash pot 93 is fixed to the housing 20 via the yoke 94.

  The latch piece 100 is formed in a substantially L shape. A rotation shaft 102 fixed to the housing 20 is provided at a corner of the latch piece 100. The latch piece 100 is supported so as to be rotatable about the rotation shaft 102. A columnar engaging portion 101 is formed at one end of the latch piece 100. The other end of the latch piece 100 is in contact with the trip arm 110.

  As shown in FIG. 2, when the circuit breaker 10 is in the ON state, the magnetic trip device 90 may overload the load to which power is supplied from the load-side terminal 41, The trip operation is performed when an overcurrent occurs due to a short circuit of the wiring connected to the terminal 41 or the like.

  Specifically, when a load to which power is supplied from the load-side terminal 41 is in an overload state, or when a wire connected to the load-side terminal 41 is short-circuited, an overcurrent is applied to the electromagnetic coil 91. Flows. When an overcurrent flows through the electromagnetic coil 91, the magnetic field formed by the electromagnetic coil 91 increases. Thereby, the iron core accommodated in the oil dash pot 93 moves upward from below with the passage of time, and the magnetic field formed by the electromagnetic coil 91 further increases. Due to such a change in the magnetic field, the magnetic force generated on the upper surface 930 of the oil dash pot 93 becomes stronger, so that one side 920 of the movable magnetic piece 92 is attracted toward the upper surface 930 of the oil dash pot 93. Thereby, the movable magnetic piece 92 rotates around the corner 922. When the movable magnetic piece 92 rotates to a position where one side 920 of the movable magnetic piece 92 contacts the upper surface 930 of the oil dash pot 93, the other side 921 of the movable magnetic piece 92 presses the engaging portion 101 of the latch piece 100. Thus, when the latch piece 100 rotates about the rotation shaft 102 in the direction indicated by the arrow C, the latch piece 100 rotates about the rotation shaft 71 in a direction away from the trip arm 110. Therefore, the trip arm 110 is separated from the side wall 65 of the separator 60, and a gap is formed between the side wall 65 of the separator 60 and the trip arm 110. When the second connection pin 83 moves into this gap, the force applied to the separator 60 from the link member 80 is released, and the separator 60 is moved upward by the urging force of the coil spring 52, that is, from the pressed position to the holding position. Displaced toward. As a result, the movable contact 51 of the movable contact 50 is separated from the fixed contact 32 of the fixed contact 30, so that the power supply side terminal 31 and the load side terminal 41 even when the handle 70 is operated to the ON position. The electric circuit between is interrupted.

According to the circuit breaker 10 of the present embodiment described above, the following functions and effects (1) to (5) can be obtained.
(1) The link member 80 has a plate-shaped connecting plate 81, a first connecting pin 82 provided at one end of the connecting plate 81, and a second connecting pin 83 provided at the other end of the connecting plate 81. . The handle 70 has an insertion portion 72 into which the arm portions 820 and 821 of the first connection pin 82 are inserted. The separator 60 is in contact with the arm portions 830 and 831 of the second connecting pin 83. According to such a configuration, power can be transmitted from the handle 70 to the separator 60 via the link member 80. In addition, since only one plate member needs to be used as the connection plate 81 of the link member 80, there is no need to use a pair of plate members unlike a conventional link member. Therefore, the structure of the link member 80 can be simplified, and the material yield of the link member 80 can be improved. In addition, component costs and manufacturing costs can be reduced.

  (2) When a pair of plate members is used as in a conventional link member, it is necessary to control their parallelism and width. This causes the productivity of the circuit breaker to deteriorate and the quality inspection to be complicated. In this regard, in the circuit breaker 10 of the present embodiment, since the connecting plate 81 of the link member 80 is formed of a single plate, it is not necessary to manage the parallelism and the width. Therefore, productivity can be improved and quality inspection can be simplified.

  (3) The handle 70 has a notch 73 provided to separate the insertion portion 72 into a first insertion portion 720 and a second insertion portion 721. One end of the connection plate 81 is inserted into the notch 73. The arm portion 820 of the link member 80 is rotatably inserted into the first insertion portion 720. The arm portion 821 of the link member 80 is rotatably inserted into the second insertion portion 721. According to such a configuration, the link member 80 can be rotatably supported on the handle 70.

(4) The separator 60 has a notch 66 for avoiding interference with the other end of the connecting plate 81. This can prevent the operation of the link member 80 from being hindered by the separator 60.
(5) The trip arm 110 has a notch 111 for avoiding interference with the other end of the connecting plate 81. This can prevent the operation of the link member 80 from being hindered by the trip arm 110.

Note that the above embodiment can also be implemented in the following forms.
-The shape of the separator 60, the handle 70, and the trip arm 110 can be changed suitably.
-The present disclosure is not limited to the above specific examples. The above-described specific examples in which a person skilled in the art appropriately changes the design are also included in the scope of the present disclosure as long as they have the features of the present disclosure. The components included in each of the specific examples described above, and their arrangement, conditions, shapes, and the like are not limited to those illustrated, but can be appropriately changed. The elements included in each of the specific examples described above can be appropriately changed in combination as long as there is no technical contradiction.

10: Circuit breaker 20: Housing 30: Fixed contact 31: Power supply terminal 41: Load side terminal 50: Movable contact 60: Separator 66: Notch (separator notch)
70: Handle 72: Insertion part 73: Notch (handle notch)
80: Link member 81: Connecting plate 82: First connecting pin 83: Second connecting pin 100: Latch piece 110: Trip arm 111: Notch (trip arm notch)
820: arm part (first arm part)
821: arm part (second arm part)
830: arm part (third arm part)
831: arm part (fourth arm part)

Claims (4)

A circuit breaker capable of connecting and disconnecting an electric circuit between a power supply side terminal and a load side terminal by contact and separation of a fixed contact and a movable contact housed inside a housing,
A handle operable to an on position and an off position,
The handle is operated from the off position to the on position while the movable contact is held in a state separated from the fixed contact by being located at the holding position when the handle is operated to the off position. A separator that is displaced from the holding position to a pressing position to contact the fixed contact by pressing the movable contact,
A link member for displacing the separator to the holding position and the pressing position by transmitting an operating force of the handle to the separator,
The link member,
A plate-like connecting plate,
A first arm portion provided at one end of the connection plate and provided so as to protrude from one side surface of the connection plate; and a first arm portion disposed coaxially with the first arm portion and protruding from the other side surface of the connection plate. A first connecting pin having a second arm portion provided as follows;
A third arm provided at the other end of the connection plate and protruding from one side of the connection plate; and a third arm disposed coaxially with the third arm and protruding from the other side of the connection plate. A second connecting pin having a fourth arm portion provided to
The handle has an insertion portion into which the first arm portion and the second arm portion of the first connection pin are inserted,
The circuit breaker, wherein the separator is in contact with the third arm portion and the fourth arm portion of the second connection pin. The handle is provided so as to separate the insertion portion into a first insertion portion and a second insertion portion, and further has a handle notch portion into which one end of the connection plate is inserted,
The first arm portion is rotatably inserted into the first insertion portion,
The circuit breaker according to claim 1, wherein the second arm portion is rotatably inserted into the second insertion portion. The circuit breaker according to claim 1, wherein the separator has a separator notch for avoiding interference with the other end of the connection plate. A latch piece that is displaced when an overcurrent flows in the electric circuit,
A trip arm that is displaced based on the displacement of the latch piece,
The trip arm,
When an overcurrent does not flow through the electric circuit, by being disposed close to the separator, the movement of the second connecting pin is regulated,
When an overcurrent flows in the electric circuit, the link member is displaced so as to be separated from the separator based on the displacement of the latch piece, and the displacement of the second connection pin is released by the displacement, whereby the link member is released. Release the force applied to the separator from
When the force applied to the separator from the link member is released, by displacing the separator from the pressing position to the holding position, the movable contact is separated from the fixed contact,
The circuit breaker according to any one of claims 1 to 3, wherein the trip arm has a trip arm notch for avoiding interference with the other end of the connection plate.

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