JP5700256B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker, and more particularly, to a circuit breaker that can be rotated only within an appropriate range when rotating a hook, has a small number of parts, is inexpensive, has good assemblability, and is highly reliable.

  A circuit breaker is a switch for automatically shutting off a circuit when a short circuit failure occurs in a transmission / distribution line, a substation bus, or a device.

A structural diagram of a conventional circuit breaker is shown in FIG.
The circuit breaker includes a main circuit, an opening / closing trip mechanism 8 ′, a trip device 9 ′, and the like.

  The main circuit includes a power supply side fixed contact base 1 ′, a fixed contact 2 ′, a movable contact 3 ′ opposite to it, a movable contact base 4 ′, a load side fixed contact base 5 ′, and the like.

  The movable contact base 4 ′ is held by a contact shaft 6 ′ via a contact spring 7 ′. The contact shaft 6 ′ is connected to the open / close trip mechanism 8 ′ and rotates to rotate the contact of the main circuit. It is structured to open and close.

  The tripping device 9 'is interlocked with the opening / closing tripping mechanism 8', and when the tripping device 9 'is operated, the main circuit is tripped. When the tripping device 9 'operates, its mechanical output pulls the latch of the opening / closing tripping mechanism portion 8', operates the opening / closing tripping mechanism portion 8 ', moves the movable contact base 4', and moves the main circuit. Is immediately opened.

  The main circuit element and the main circuit opening / closing element are housed in the main body case 10 ′ and the main body cover 11 ′, and constitute a circuit breaker.

The internal configuration of the opening / closing trip mechanism 8 ′ will be described with reference to FIG.
The opening / closing trip mechanism 8 'includes a fixed frame 13', a handle link 14 ', a hook 15', a hook pin 16 ', a link up / down pin 17', an upper link 18 ', a lower link 19', a trip fitting 20 ', and a trip fitting. It comprises a pin 21, a trip spring 22, a trip link 23 ', a trip link shaft 24', and a trip link pin 25 '.

  The operation handle 12 ′ is coupled to the handle link 14 ′, and the handle link 14 ′ rotates around one point of the fixed frame 13 ′.

  The lower link 19 ′ is connected to the movable contact base 4, the lower link 19 ′ and the upper link 18 ′ are connected by a link up / down pin 17 ′, and the link up / down pin 17 ′ and the handle link 14 ′ are connected to a drive spring 25. Since they are connected by ', the upper link 18', the lower link 19 ', and the drive spring 25' are interlocked with each other through the link upper and lower pins 17 '.

  The hook 15 ′ is connected to the fixed frame 13 ′ by a hook pin 16 ′, and rotates around the hook pin 16 ′.

  The upper link 18 ′ is connected to the hook upper hitting portion 27 ′, and rotates about the hook upper hitting portion 27.

  Since the trip fitting 20 'is connected to the fixed frame 13' by the trip fitting pin 21 'together with the trip spring 22', the trip fitting 20 'rotates around the trip fitting pin 21'. And the trip metal fitting 20 acts on the load side by the trip spring 22 '.

  Since the trip link 23 'is connected to the fixed frame 13' by the trip link pin 25 ', the trip link 23' rotates around the trip link pin 25 '.

  The hook 15 ′ is lifted upward by the drive spring 25 ′ via the upper link 18 ′, and tries to rotate in the direction of the power supply about the hook pin 16 ′. , The rotation of the hook 15 'is stopped. Further, the trip fitting 20 'tries to disengage the hook 15' by the trip spring 22 ', but the rotation is stopped by the trip link 23'.

  In this mechanism, when the trip link 23 'is rotated by the trip device 9', the trip link 23 'and the trip fitting 20' are unlatched, the trip fitting 20 'rotates, and the trip fitting 20' and the hook The latch 15 'was released and the hook 15' rotated, and the movable contact base 4 'was moved accordingly, and the main circuit was opened.

Japanese Patent Application No. 8-62449 Japanese Patent Application No. 8-246170

  However, the above prior art does not take into account the arrangement of the hooks 15 ′, the upper links 18 ′, the lower links 19 ′ and the fixed frame 13 ′ and the stoppers of the hooks 15 ′ and the lower links 19 ′. It is difficult to stop 'and the lower link 19' at a predetermined position, and it is necessary to prepare new parts. According to the present invention, it is possible to easily stop the rotation of the hook and the lower link at a predetermined position without using a new part, and to effectively use the space.

  The present invention relates to a circuit breaker having a hook and a lower link with appropriate rotation angles, a small number of parts, a low cost, good assemblability, and high reliability.

The above object can be achieved by the present invention.
The present invention includes a main circuit having a power source side fixed contact block, an opposing contact, a movable contact block, an overcurrent relay unit and a load side fixed contact block, a fixed frame, a hook, an upper link connected to the hook, and the An open / close trip mechanism that opens and closes circuit contacts by rotating the movable contact base; an operating handle; and a lower link that connects the upper link and the movable contact base. A circuit breaker having a drive spring that is moved by the operation of the operation handle, and a tripping device that operates the open / close trip mechanism, wherein the fixed frame is a frame having a substantially rectangular cross section. The hook, the upper link, and the lower link are respectively mounted in the frame of the fixed frame, and the hook is interposed between the fixed frame and the upper link. Is location, further, is formed in a U-shape, the tip portions of both sides of該Koji is rotatably supported pivot on the frame of each of the fixed frame, engaging the portion Gath lip bracket connecting the two sides of the U is configured to further placing the hook between the upper link and the stationary frame, to form a bent portion on said fixed frame, by using as a hook stopper during tripping The circuit breaker is configured to stop the hook and the upper link connected to the hook by bringing the hook into contact with the bent portion .

  As described above, according to the present invention, it is possible to prevent the rotating hook and the lower link from being stopped at a predetermined position and rotating at an angle beyond that without using new parts. The circuit breaker can be effectively used, is inexpensive, has good assemblability, and is highly reliable.

The perspective view of one Example of the circuit breaker of this invention. Explanatory drawing of one Example of the circuit breaker of this invention. Explanatory drawing of an example of the switching trip mechanism part in the circuit breaker of this invention. An explanatory view of an example of arrangement of a fixed frame etc. in a circuit breaker of the present invention. Explanatory drawing of the circuit breaker of a prior art. Explanatory drawing of the switching trip mechanism part in the circuit breaker of a prior art.

The best mode for carrying out the present invention will be described.
An embodiment of the circuit breaker of the present invention will be described with reference to FIGS.
1 is a perspective view of an embodiment of a circuit breaker according to the present invention, FIG. 2 is an explanatory view of an embodiment of the circuit breaker according to the present invention, and FIG. 3 is an opening / closing trip mechanism part in the circuit breaker of the present embodiment. FIG. 4 is an explanatory view of an arrangement example of a fixed frame and the like in the circuit breaker of the present embodiment.
The present invention relates to a main circuit composed of a power source side fixed contact block, opposing contacts, a movable contact block, an overcurrent relay unit, and a load side fixed contact block, a fixed frame, a hook and an upper link connected to the hook. A circuit breaker having an opening / closing trip mechanism that opens and closes a circuit contact by rotating a movable contact base, and a tripping device that operates the opening / closing trip mechanism. A circuit breaker disposed between the fixed frame and the upper link.
In the present invention, the fixed frame is a circuit breaker having a hook stopper.
The present invention also has a lower link, and the lower link is a circuit breaker disposed between the fixed frame and the upper link.
Furthermore, the present invention is a circuit breaker in which the fixed frame has a lower link stopper formed by stamping.

  The circuit breaker of this embodiment is a three-pole circuit breaker, and each pole is a power-side fixed contact base 1 electrically connected to the power-side terminal and a load-side fixed electrically connected to the load-side terminal. A load-side fixed contact base 5 as a conductor is provided at a substantially point-symmetrical position with respect to the rotation center of the movable contact base 4 as a movable conductor held rotatably. The load side fixed contact base 5 and the movable contact base 4 form a main circuit.

  The power-side fixed contact base 1 has a power-side fixed contact 2 at a position facing the power-side movable contact 3, and the load-side fixed contact base 5 has a load-side fixed contact 2 at a position facing the load-side movable contact 3. Have.

  The movable contact base 4 has a power-side movable contact and a load-side movable contact 3 at point-symmetrical positions with respect to the rotation center thereof, and is held by a contact shaft 6 via a contact spring 7, and the contact shaft 6 is The contact of the main circuit is opened and closed by connecting and rotating with the opening / closing trip mechanism 8.

  The movable contact base 4 is mechanically connected to an open / close trip mechanism section 8 as an open / close trip mechanism, and when the open / close trip mechanism section 8 is turned on, the power source side fixed contact base 1 and the load side fixed contact base 5 are connected. And rotate to the position where it is electrically connected.

  This main circuit is housed in a main circuit case formed of an insulator. In a state where the main circuit is housed in the main circuit case, the power supply side terminal portion of the power supply side fixed contact block 1 and the load side terminal portion of the load side fixed contact block 5 protrude from the main circuit case, but the other portions are the main portions. Located in the circuit case and electrically insulated from the outside. The holding member that rotatably holds the movable contact base 4 in the main circuit case is also formed of an insulating material.

  An arc chute (arc extinguishing device) is provided near the contacts of the power supply side fixed contact base 1, the load side fixed contact base 5 and the movable contact base 4 in the main circuit case to attract and cool an arc generated at the time of interruption. Further, in this embodiment, an arc discharge port for discharging the cooled arc gas is provided in the main circuit case.

  The main circuit cases are arranged in parallel for three poles, and holding members are connected so that the movable contact bases 4 of the respective poles can be opened and closed substantially simultaneously.

  In this embodiment, the opening / closing trip mechanism 8 is mounted on the outer upper part of the main circuit case of the central pole, and is connected to an insulating rotating arm connected coaxially to the rotating shaft of the holding member. As a result, the opening / closing trip mechanism 8 is provided outside the main circuit case and connected to the movable contact base 4 via the insulator, so that the opening / closing trip mechanism 8 even when a voltage is applied to the main circuit. No voltage is applied to.

  The open / close trip mechanism 8 is manually operated to turn on and off the main circuit by the operation handle 12, and when the current of the main circuit exceeds a predetermined value, the trip device 9 performs the shut-off operation of the main circuit. Is called.

  The tripping device 9 includes a fixed core disposed in the vicinity of the load-side fixed contact base 5, a magnetic circuit that is rotatably held at one end and substantially closed together with the fixed core at a position facing the fixed core. And a transmission lever for transmitting the operation of the movable core to the opening / closing trip mechanism unit 8.

  When the current of the main circuit increases and exceeds a preset value (about 10 to 20 times the rated current), the magnetic flux generated around the conductor of the load side fixed contact block 5 increases and the movable core is fixed. The transmission lever is brought into contact with the trip link shaft 24 to rotate, trip link 23 is rotated, and the main circuit is opened by the trip operation of the opening / closing trip mechanism 8. As a result, the circuit is cut off and a large overcurrent can be prevented from flowing to the load side.

  In this embodiment, a current transformer for detecting a current flowing through the main circuit is provided in a portion from the main circuit case of the load side fixed contact block 5 of the main circuit to the load side terminal, and the output of this current transformer is a current transformer. Is supplied to an overcurrent detection circuit provided above the device.

  The overcurrent detection circuit generates an output based on a predetermined time limit characteristic in a range of about 1.1 times to about 20 times the rated current. The output of the overcurrent detection circuit is supplied to a magnetic trip device (not shown) that releases the movable core attracted by the permanent magnet by reverse excitation. As such a magnetic tripping device, for example, the one described in Patent Document 1 can be used.

  When released, the movable core of the magnetic trip device contacts the trip link shaft 24 to rotate the trip link 23 and opens the main circuit by the trip operation of the open / close trip mechanism 8. As a result, the circuit is interrupted and overcurrent can be prevented from flowing to the load side.

  The main circuit case, the open / close trip mechanism 8, the trip device 9, the current transformer, the overcurrent detection circuit, and the magnetic trip device are housed in a housing having a main body case 10 and a main body cover 11, and are opened and closed. The knob portion of the operation handle 12 mounted on the mechanism unit 8, the power supply side terminal, and the load side terminal are exposed outside the housing.

  In this embodiment, the main circuit is formed by the power source side fixed contact base 1, the load side fixed contact base 5 and the movable contact base 4, but the power source side fixed contact base and the load side used in the prior art, The main circuit formed by the movable contact base connected to the side may be opened / closed by an opening / closing trip mechanism.

An example of the structure and the like of the opening / closing trip mechanism 8 will be described with reference to FIG.
The opening / closing trip mechanism 8 includes a hook stopper 13A formed by bending, a lower link stopper 13B formed by punching and a fixed frame 13 provided with a projection 28, a handle link 14, a hook 15, a hook pin 16, The link upper and lower pins 17, the upper link 18, the lower link 19, the trip fitting 20, the trip fitting pin 21, the trip spring 22, the trip link 23, the trip link shaft 24, and the trip link pin 25 are configured.

  The operation handle 12 is coupled to the handle link 14, and the handle link 14 rotates around one point of the fixed frame 13.

  The fixed frame 13 has a U-shaped part and a flat-shaped part, and both U-shaped tips are caulked to a flat part to form a substantially rectangular cross-section frame. Formed in the body.

  A hook 15, an upper link 18, and a lower link 19 are mounted in the frame of the fixed frame 13.

  The hook 15 is formed in a U-shape, the tip portions of both sides of the U-shape are rotatably supported by the frame body of the fixed frame 13, and the portion connecting both sides of the U-shape is engaged with the trip fitting 20. Protrusions that pivotably lock the upper link 18 are formed on the inner sides of the substantially central portions of both sides of the U-shape.

  The hook 15 is rotatably connected to the fixed frame 13 by a protrusion 28, and the protrusion 28 is the center of hook rotation.

  The upper link 18 is rotatably connected to the hook upper launching portion 27 and rotates around the hook upper launching portion 27.

  The lower link 19 is connected to the movable contact base 4, and the lower link 19 and the upper link 18 are connected by a link up / down pin 17, and the link up / down pin 17 and the handle link 14 are connected by a drive spring 25. The upper link 18, the lower link 19, and the drive spring 25 are interlocked with each other via the link up / down pins 17.

  The upper link 18 and the lower link 19 are each formed in a substantially U shape, and the vicinity of the bottom side of the U shape is bent by approximately 90 degrees to have a U-shaped cross section.

  The upper link 18 and the lower link 19 are rotatably connected in the vicinity of the bottom portion of the U-shape so that the bent portions face in opposite directions. The upper link 18 and the lower link 19 of the present embodiment may be manufactured by a method of combining the upper link 18 and the lower link 19 in the pressing process described in Patent Document 2.

  The upper link 18 and the lower link 19 are combined so that the upper link 18 is on the inner side and the lower link 19 is on the outer side, and both sides of the U-shape of the upper link 18 are freely rotatable on the protrusions formed on the hook 15 inside the hook 15. Engage with.

  Both sides of the U-shape of the lower link 19 are rotatably locked to an insulating rotating arm connected to the holding member of the movable contact base of the main circuit. Accordingly, the positional relationship of the upper link 18, the lower link 19, and the hook 15 with respect to the fixed frame 13 is such that the upper link 18 is the innermost side, the lower link 19 and the hook 15 are positioned on the outer side, and the fixed frame 13 is the outermost side. Become.

  Since the trip fitting 20 is connected to the fixed frame 13 by the trip fitting pin 21 together with the trip spring 22, the trip fitting 20 rotates around the trip fitting pin 21. A force that rotates to the load side by the trip spring 22 is applied to the trip fitting 20.

  Since the trip link 23 is rotatably connected to the fixed frame 13 by the trip link pin 25, the trip link 23 rotates around the trip link pin 25.

  The hook 15 is lifted upward by the drive spring 25 via the upper link 18 and tries to rotate in the power supply direction around the protrusion 28, but the tip of the hook 15 is engaged with the trip fitting 20. The rotation of the hook 15 is stopped. Further, the trip fitting 20 tries to disengage the hook 15 by the trip spring 22, but the rotation is stopped by the trip link 23.

  By rotating the trip link 23 by the tripping device 9, the trip link 23 and the trip fitting 20 are unlatched and the trip fitting 20 is rotated, and the trip fitting 20 and the hook 15 are unlatched and the hook 15 is rotated. Accordingly, the movable contact base 4 is moved to open the main circuit.

  The fixed frame 13 has a hook stopper 13A formed by bending processing, a lower link stopper 13B formed by punching processing, and a protrusion 28 serving as a rotation center of the hook 15 inside the frame body. The hook stopper 13A and the lower link stopper 13B are on the opposite side with respect to the protrusion 28, and the protruding dimension of the hook stopper 13A into the frame is formed to be larger than the protruding dimension of the lower link stopper 13B into the frame.

  An example of the arrangement of the fixed frame 13, the hook 15, the upper link 18 and the lower link 19 in the circuit breaker of the present embodiment will be described with reference to FIGS. 4a and 4b.

  The hook 15 is disposed and connected between the fixed frame 13 and the upper link 18. Since there is a gap below the hook 15, the lower link 19 is disposed there.

  Since the hook 15 is disposed between the fixed frame 13 and the upper link 18, if a bent portion is formed in the fixed frame 13, it can be used as a hook stopper 13 </ b> A, and the lower link is inserted into the gap below the hook 15. Since 19 can be arranged, the space is effectively used. Then, if the punching process is used, a protrusion can be easily formed on the fixed frame 13, and the protrusion can be used as the stopper 13B of the lower link 19, so that it is not necessary to prepare another part, and the hook 15 The lower link 19 can be stopped at a predetermined position.

  Further, since the stopper 13A of the hook 15 is formed by bending, it is possible to easily set the thickness in the direction in which a force is received when the hook 15 abuts, and a sufficient strength as a stopper of the hook 15 can be obtained.

  Since the hook 15 and the lower link 19 are provided adjacent to the fixed frame 13 and at a short distance from the frame 13, when the stoppers 13A and 13B of the hook 15 and the lower link 19 are viewed as cantilever beams, the contact position is a fulcrum. Therefore, the amount of deformation (amount of deflection) at the time of contact is small, metal fatigue is reduced, and the life can be extended.

  As described above, the present embodiment reduces the number of parts, reduces costs, improves assemblability, and improves reliability.

  In addition, although the formation method of the protrusion was a punching process in the present embodiment, it is not limited to this, and a member to be the protrusion is separately formed, and plastic deformation such as caulking, screw or rivet fastening, resistance welding, etc. It may be fixed to the fixed frame by welding, adhesion, or a combination thereof.

DESCRIPTION OF SYMBOLS 1 Power supply side fixed contact stand 2 Fixed contact 3 Movable contact 4 Movable contact stand 5 Load side fixed contact stand 6 Contact shaft 7 Contact spring 8 Opening-closing trip mechanism part 9 Tripping device 10 Body case 11 Body cover 12 Operation handle 13 Fixed frame 13A hook stopper 13B lower link stopper 14 handle link 15 hook 16 hook pin 17 link up / down pin 18 upper link 19 lower link 20 trip bracket 21 trip bracket pin 22 trip spring 23 trip link 24 trip link shaft 25 trip link pin 26 drive spring 27 hook Upper launch part 28 Projection

Claims (1)

A main circuit having a power supply side fixed contact block, an opposing contact, a movable contact block, an overcurrent relay unit and a load side fixed contact block;
Opening and closing having a fixed frame, a hook, an upper link connected to the hook, and a lower link connecting the upper link and the movable contact base, and opening and closing circuit contacts by rotating the movable contact base A tripping mechanism,
In a circuit breaker comprising an operation handle and a tripping device connected to the lower link and having a drive spring that is moved by operation of the operation handle, and a tripping device that operates the opening / closing trip mechanism.
The fixed frame is formed in a frame having a substantially rectangular cross section, and the hook, the upper link, and the lower link are mounted in the frame of the fixed frame,
The hook is disposed between the fixed frame and the upper link, and is further formed in a U shape, and tip portions on both sides of the U shape are rotatably supported by the frame body of the fixed frame, It is configured to engage a portion Gath lip bracket connecting the two sides of the U, further placing the hook between the upper link and the stationary frame, to form a bent portion to said fixed frame When used as a hook stopper, the hook and the upper link connected to the hook are stopped by bringing the hook into contact with the bent portion during a tripping operation. Circuit breaker to do.

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