JP4087835B2 - Circuit breaker accessories - Google Patents

Description

  The present invention relates to a circuit breaker, and more particularly, to a remote trip accessory that is selectively attached to a circuit breaker that can reduce the size and manufacturing cost of the circuit breaker.

  In general, a circuit breaker is a device that protects load-side equipment and human life by protecting an electric wire, opening and closing a load, and interrupting a circuit in the event of an overload and short circuit accident.

  Such a circuit breaker is a switchgear that is installed between a power supply side terminal and a load side terminal and performs a circuit interruption action, and a current input from the power supply side terminal, for example, a ground fault current, a short circuit current When an abnormal current such as the above occurs, this is detected, and an abnormal current detection and trip mechanism for providing a driving force to the switchgear, and an arc that is mounted around the switchgear and extinguishes an arc generated during a trip operation. An arc extinguishing part and a handle for returning the tripped circuit breaker to the on or off state after removing the cause of the abnormal current are configured.

  When trying to forcibly trip such a circuit breaker at a remote location, an accessory device called a voltage trip device is selectively attached to the circuit breaker.

  FIG. 9 is a perspective view of a conventional circuit breaker accessory, and FIG. 10 is a cross-sectional view of the conventional circuit breaker accessory.

  As shown in the figure, a conventional circuit breaker accessory is attached to a base frame 102, the base frame 102, and connected to a remote power source and a switch. A coil 104 to be demagnetized, a cylindrical bobbin 106 around which the coil 104 is wound, and a fixed core 108 fixed to one side of the bobbin 106 and magnetized when power is applied to the coil 104 The movable core 110 is disposed on the inner peripheral surface of the bobbin 108 so as to be linearly movable, is opposed to the fixed core 108 and is linearly moved when the fixed core 108 is magnetized, and the outer peripheral surface of the bobbin 106. And a yoke 112 for fixing a part such as a bobbin 106 around which the coil 104 is wound, and between the yoke 112 and the bobbin 106 And a magnetic flux generated when a power source is applied to the coil 104 is prevented from affecting the movable core 110, and a yoke plate 114 that supports the movable core 110 in a linearly movable manner, and the movable core 110. A trip lever 116 that is rotatably disposed forward and rotates by the linear movement of the movable core 110 to press a latch holder of the switchgear to move the switchgear to a trip position; and the trip lever 116 is connected to a return spring 118 that is mounted on one side and returns the trip lever 116 to its original position, and a lead wire 120 connected to a remote power source and switch, and applies or cuts off the power to the coil 104. A micro switch 122 for turning on and off the micro switch 122 And quenching the lever 124, and a.

  As shown in FIG. 11, the micro switch 122 includes a body 130 fixed to the base frame 102, a plurality of terminals 132 attached to one side of the body 130 and connected to the lead wires 120, A button 134 that is mounted on the other side of the body 130 and that is actuated by the switching lever 124 to turn on / off the power. The microswitch 122 has a contact (open / closed by pressing the button 134). (Not shown).

  The switching lever 124 is rotatably connected to the base frame 102 by a hinge 126. One side of the switching lever 124 is bent so that the button 134 can be pressed, and the other side is a movable contact of an opening / closing device. Contact the support shaft. The switching lever 124 presses the button 134 while rotating around the hinge 126 by rotation of the opening / closing device to the trip position of the shaft when the attachment device is operated and the opening / closing device is tripped. The micro switch 122 is turned off. That is, the switching lever 124 protects the coil 104 from being burned by cutting off the power supplied to the coil 104 when the circuit breaker switching device completes the operation to the trip position by the attached device. Means.

  Hereinafter, the operation of the accessory of the conventional circuit breaker configured as described above will be described.

  FIG. 12 is an operation state diagram of a conventional circuit breaker accessory.

  As shown in the figure, when the user tries to forcibly trip the circuit breaker at a remote location, a switch (not shown) is turned on to supply power to the coil 104 through the lead wire 120. At this time, since the microswitch 122 is in an ON state, power can be applied to the coil 104.

  Then, the fixed core 108 is magnetized, and the trip lever coupled to one end of the movable core 110 is pulled while the movable core 110 is sucked to the fixed core 108 side by the magnetic force of the fixed core 108. As a result, the trip lever 116 rotates about the central axis (not shown) in the counterclockwise direction of the drawing to be in the state shown in FIG. While the trip lever 116 is rotated, the latch holder (not shown) of the switchgear is rotated to move the switchgear to the trip position. At this time, one end of the switching lever 124 is pressed upward while the shaft supporting the movable contact rotates. Then, by releasing the button 134 of the micro switch 122 while the other end portion of the switching lever 124 rotates, the micro switch 122 is turned off with its internal contact open, and the current flowing through the coil 104 is Blocked.

  When the current flowing through the coil 104 is interrupted, the movable core 110 is returned to its original position (position far from the fixed core) by the elastic force of the return spring 118, and the trip lever connected to the movable core 110. 116 is also returned to the original position (position shown in FIG. 10).

  Here, using the micro switch 122 that cuts off the power applied to the coil 104 uses the power connected to the power supply terminal of the circuit breaker as the power applied to the coil 104 of the accessory. Without using a separate remote power source. In addition, since the coil used for the accessory is a short-time operation type coil, if a current is applied for a long period of time, an excessive heat is generated and an accident that burns is caused. Requires a switch to shut off.

  However, in such a conventional circuit breaker accessory, a microswitch is used to cut off the current applied to the coil, and the microswitch occupies a considerable part of the total volume of the accessory, The size of the device is increased, which makes it difficult to reduce the size of the circuit breaker, and the cost of manufacturing the attached device and the circuit breaker increases due to the price of the microswitch.

  The present invention has been proposed in order to solve such a conventional problem, and by replacing a conventionally used micro switch, a switch device with a small occupied space is installed, and thus an accessory device and a circuit breaker are provided. The purpose of the present invention is to provide a circuit breaker accessory that can reduce the manufacturing cost of the accessory and the circuit breaker because the device is downsized and a relatively expensive microswitch is not required as compared with the switch device of the present invention. To do.

  An object of the present invention is to provide an opening / closing device for opening / closing a circuit between a power source and a load, a detection device for detecting an abnormality on the circuit and operating the opening / closing device to a trip position, and the opening / closing device by remote control. A circuit breaker comprising: a yoke, a bobbin provided on the yoke and having a hollow portion; and wound around the bobbin and magnetized in response to voltage application or interruption. Or it is connected to a coil that is demagnetized (demagnetized), a switch that supplies or cuts off power at a remote location, and a connect plate that applies or cuts off voltage to the coil, and can be moved vertically by the pressing force of the switchgear When the switchgear is moved to the trip position, the connection plate is moved to a position where the power supply to the coil is cut off. A pressurizing rod that pressurizes so as to operate, a movable core that is installed so as to be linearly movable through the hollow portion of the bobbin, and that moves so that the opening and closing device operates to a trip position according to the magnetization of the coil, This can be achieved by providing a circuit breaker accessory according to the present invention comprising a trip lever connected to the movable core and transmitting to the switchgear a power for operating in a trip position.

  In the circuit breaker accessory according to the present invention, instead of the conventional microswitch that is horizontally arranged and occupies a considerable space and causes cost increase, a switch device (connect plate and The circuit breaker can be reduced in size by providing the pressure rod), and the cost of the accessory and the circuit breaker can be reduced by providing the accessory that unitizes the switch device and the coil assembly. There is.

  Hereinafter, preferred embodiments of a circuit breaker accessory according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a sectional view of a circuit breaker in which an accessory according to the present invention is installed.

  The circuit breaker provided with the accessory according to the present invention includes a switchgear 8 that opens and closes a circuit between a power source and a load, and an abnormality detection instrument that detects an abnormality on the circuit and moves the switchgear 8 to a trip position. 10, an arc extinguishing device that extinguishes the arc generated from the opening / closing device 8 (in FIG. 1, a portion in which a plurality of square members are vertically stacked in front of the movable contact 6), and these devices are built in Case 2 and an accessory 12 for remote trip according to the present invention.

  The opening / closing device includes a movable contact and a fixed contact, which will be described later, and includes parts such as a known link, a spring, and a latch, but a detailed description of the configuration is omitted. In FIG. 1, reference numeral 4 denotes a fixed contact connected to the power supply side terminal, and reference numeral 6 denotes a movable contact that is movable between a position that contacts the fixed contact 4 and a position that is separated from the fixed contact 4. Reference numeral 14 denotes a crossbar which is movable by the movable contact 6 when it is moved to a position where the movable contact 6 is separated from the fixed contact 4, and is movable upward. The handle is connected to the instrument 8 and is manually operated so as to move to a position where the movable contact 6 contacts or separates from the fixed contact 4.

  FIG. 2 is a perspective view of a circuit breaker accessory according to the present invention, and FIGS. 3 and 4 are longitudinal sectional views showing a state where the accessory of FIG.

  Hereinafter, with reference to FIGS. 2-4, the structure of the accessory of the circuit breaker by this invention is demonstrated in detail.

  The circuit breaker accessory 12 according to the present invention is connected to a yoke 44, a bobbin 42 having a hollow portion installed on the yoke 44, and a switch (not shown) for supplying or shutting off power at a remote place, The lead wire 9 connected to the yoke 44, the coil 40 wound around the bobbin 42 and magnetized or demagnetized (demagnetized) depending on the application of voltage, and the coil 40 connected to the lead wire 9 When the switchgear 8 moves to the trip position when the switchgear 8 is moved to the trip position, the connect plate 30 is connected to the coil 40. Depends on the magnetization of the coil 40, which is installed so as to be linearly movable through the pressurizing rod 32 that pressurizes the power supply so that the power supply is cut off and the hollow portion of the bobbin 42 A movable core 24 that moves so that the opening / closing device 8 operates to a trip position, and a trip lever 26 that is connected to the movable core 24 and transmits power for operating to the trip position to the opening / closing device 8. And including. Reference numeral 20 denotes a base frame that supports the coil 40 together with the yoke 44, and the coil assembly 22 includes the coil 40, the bobbin 42, the yoke 44, and the base frame 20. Reference numeral 46 denotes a groove portion on the yoke 44 into which one end portion (right end portion in the drawing) of the movable core 24 is inserted when sucked.

  The circuit breaker accessory 12 further includes a spring 28 for returning the trip lever 26 from the trip position to the original position. Specifically, one end of the spring 28 is connected to the other end of the movable core 24 (in the drawing). And the other end of the spring 28 is fixedly supported on one side of the fixed base frame 20. . The spring 28 provides an elastic biasing force to the trip lever 26 and the movable core 24 coupled thereto in a reset position, that is, a direction in which the trip lever 26 is far from the core assembly 22 (left side in the drawing).

  Here, when the coil 40 is magnetized, the yoke 44 installed so as to surround the bobbin 42 is also magnetized, and the movable core 24 is an iron core and is sucked by the magnetic force of the coil 40 and the yoke 44 (ie, FIG. In the right direction).

  The connect plate 30 is a kind of terminal connected to the lead wire 9 and is made of a conductive material and is provided in a plate spring shape having a predetermined elastic force. The lead wire 9 can be connected to a remote power source and switch to operate the accessory of the present invention remotely to trip the circuit breaker. As shown in FIG. 5, such a connection plate 30 includes a flat portion 50 that is one end connected to a power source and a switch at a remote location via a lead wire 9, and extends flat from the flat portion 50. And a bent portion 52 that provides elastic force in the direction. One end portion of the connect plate 30, that is, the flat portion 50 is a power source connecting portion that is connected to a remote switch and power source, and the other end portion, that is, the bent portion 52 is in contact with the contact terminal 54. The contact terminal 54 is electrically connected to the coil 40 and fixed to the base frame 20.

  The pressure rod 32 is installed below the connect plate 30 so as to face the bent portion 52 of the connect plate 30 and to be movable in the vertical direction.

  The return spring 60 is a spring that is elastically biased so that the pressure rod 32 returns to the original position, that is, the position separated from the connect plate 30 (the position moved downward in FIG. 3), and one end portion thereof. Is fixedly supported by the base frame 20, and the other end is movably supported by the pressure rod 32. As shown in FIG. 6, the pressure rod 32 has a body 62 formed in a bar shape having a certain length, and is formed at the upper end of the body 62 to cut off the voltage supplied to the coil 40. That is, a first operating portion 64 that pressurizes the connect plate 30 in a direction in which the connect plate 30 is separated from the contact terminal 54 and a lower end of the body 62, and the opening / closing device 8, specifically, a part thereof. The second operating portion 66 that receives upward pressing force from the cross bar 14 and a spring seat portion 68 that protrudes from the side surface of the body 62 and supports the return spring 60 are configured.

  The first operating portion 64 is formed as an inclined surface so as to be in surface contact with the connect plate 30, and the second operating portion 66 is easily subjected to a pressing force from the crossbar 14 that is a part of the opening / closing device 8. That is, the cross bar 14 is easy to contact and is formed in a planar shape.

  The operation of the circuit breaker accessory according to the present invention configured as above will be described below.

  When the user feels that it is necessary to cut off the circuit between the power source and the load at a remote location and turns on a switch connected to the remote power source, a current flows through the connector plate 30 via the lead wire 9. As shown in FIG. 3, in the reset state, since the connector plate 30 is in contact with the contact terminal 54 connected to the coil 40, the current supplied from the remote power source is supplied to the coil 40 via the lead wire 9. To flow into.

  Then, the coil 40 and the yoke 44 are magnetized, the movable core 24 is sucked by the magnetic force of the coil 40 and the yoke 44, moved along the hollow portion of the bobbin 42, and the trip lever 26 coupled to the movable core 24 is also provided. It is linearly moved together with the movable core 24 (FIG. 8). As a result, the trip lever 26 presses and rotates, for example, the latch holder (not shown) of the opening / closing device 8 to release the latch (not shown) and fill the spring (not shown). While the elastic energy is radiated, the latch, the link (not shown), and the movable contact 6 are moved to the trip position, and the circuit is cut off (tripped).

  During such operation, as shown in FIG. 1, when the cross bar 14 is pressed upward while the movable contact 6 rotates upward, the second of the pressure rod 32 is moved while the cross bar 14 moves upward. The operating portion 66 is pressed upward, whereby the first operating portion 64 presses the connect plate 30 while the pressure rod 32 moves upward. Then, the power supply to the coil 40 is cut off while the connect plate 30 is separated from the contact terminal 54 (FIG. 7).

  When the power supply to the coil 40 is cut off, the trip lever 26 is moved away from the original position, that is, from the coil assembly 22, as shown in FIG. The movable core 24 connected to the trip lever 26 is also moved in the same direction as the trip lever 26 and returned to the original position.

  Thereafter, when the circuit breaker is to be turned on again, the user turns off the switch at a remote location, comes to the position where the circuit breaker is installed from the remote location, and sets the circuit breaker handle 16 to the on position. Manipulate. Then, the movable contact 6 is moved so as to come into contact with the fixed contact 4, whereby the cross bar 14 is moved downward. As a result, there is no pressure to press the cross bar 14 upward, and the pressure rod 32 is The connect plate 30 is moved downward by the elastic force of the return spring 60, so that the bent portion 52 is flattened by the elastic restoring force so as to be in contact with the contact terminal 54. At this time, no current flows through the connect plate 30 because the remote switch is turned off.

1 is a cross-sectional view of a circuit breaker in which an accessory according to the present invention is installed. 1 is a perspective view of a circuit breaker accessory according to the present invention. FIG. It is a longitudinal cross-sectional view which shows the state which the attachment of FIG. 2 act | operated to the reset position. It is a longitudinal cross-sectional view which shows the state which the attachment of FIG. 2 act | operated to the reset position. FIG. 4 is a perspective view of a connect plate of an accessory according to the present invention. FIG. 3 is a perspective view of a pressure rod of the accessory according to the present invention. It is a longitudinal cross-sectional view which shows the state which the attachment tool of FIG. 2 act | operated to the trip position. It is a longitudinal cross-sectional view which shows the state which the attachment tool of FIG. 2 act | operated to the trip position. It is a perspective view of the accessory of the conventional circuit breaker. It is sectional drawing of the accessory of the conventional circuit breaker. It is a perspective view of the microswitch of the conventional accessory. It is an operation state figure to the trip position of the attachment of the conventional circuit breaker.

Explanation of symbols

2 Case 4 Power supply side terminal 6 Load side terminal 8 Opening / closing device 10 Abnormal current detection part 12 Accessory device 14 Crossbar 16 Handle 20 Base frame 24 Movable core 26 Trip lever 28 Trip spring 30 Connect plate 32 Pressure rod 40 Coil 42 Bobbin 44 Yoke 46 Insertion groove 50 Power supply connection part 52 Terminal contact part 54 Contact terminal 60 Return spring 62 Body 64 First action part 66 Second action part 68 Spring seat part

Claims (1)

A switchgear for opening and closing a circuit between a power source and a load, a detection tool for detecting an abnormality on the circuit and operating the switchgear to a trip position, and an accessory for operating the switchgear to a trip position by remote control A circuit breaker comprising:
York,
A bobbin installed on the yoke and having a hollow portion;
A coil wound around the bobbin and magnetized or demagnetized in response to application or interruption of voltage;
Connected to a switch that supplies or shuts off power at a remote location, and a connect plate that applies or cuts off voltage to the coil;
It is installed so as to be movable in the vertical direction by the pressing force of the switchgear, and when the switchgear is moved to the trip position, the connect plate is moved to a position for cutting off the power supply to the coil. A pressure rod that pressurizes
A movable core that is installed so as to be linearly movable through the hollow portion of the bobbin, and moves so that the opening / closing device operates to a trip position according to the magnetization of the coil;
A trip lever connected to the movable core and transmitting power for operating to a trip position to the switchgear;
A spring for returning the trip lever from the trip position to the original position, and
Here the connect plate is
A plane unit connected to a remote power source and switch;
The extending from the planar portion, possess a bent portion, a for providing elastic force in a direction to become flat, and
The pressure rod is located below the connect plate and is movable in the vertical direction, and the pressure rod is
Body,
A first operating part formed at the upper end of the body and pressurizing the bent part of the connect plate in a direction to cut off a voltage supplied to the coil;
A second actuating part formed at the lower end of the body and receiving upward pressing force from the opening and closing device;
A spring seat portion that protrudes from the side surface of the body and supports a return spring for returning the pressure rod from a position for pressurizing the connect plate to an original position;
The first operating part has an inclined surface so as to be in surface contact with the bent part of the connect plate,
The circuit breaker accessory as set forth in claim 1, wherein the second actuating part is formed in a flat shape so as to easily receive a pressing force from the switchgear .

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