JP2015028906A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily transfer heat due to an arc generated at a contact or connection point to a draw-removal frame.SOLUTION: It is presupposed that a circuit breaker includes a terminal connected to a cable way, and a stator piece and a mover piece connected to the terminal and also includes driving means of making a contact atop of the mover piece contact and leave a contact atop of the stator piece to achieve making and breaking, and the driving means includes a movable frame and a draw-removal frame successive in an instrument frame lengthwise direction and a snap mechanism above the center of an instrument frame. The circuit breaker is so configured that a base end of a bimetal is fixed nearby a connection position between the stator piece and the terminal; the bimetal is raised along both lateral directional sides of the draw-removal frame; the draw-removal frame is rotated in a direction in which the contacts are broken by utilizing displacement of a tip part accompanying temperature deformation of the bimetal so as to break the contacts which are opened; and a permanent magnet piece for arc scattering is fitted in a heat insulation case of the bimetal provided on both the lateral directional sides of the draw-removal frame.

Description

  The present invention relates to a circuit breaker for breaking a circuit when an abnormal current or an arc is generated.

  FIG. 4 is a longitudinal sectional view of a contact position when the circuit breaker according to the prior art (Japanese Patent Laid-Open No. 2011-119155) of the present invention is opened.

  A pair of terminals 50a and 50b are provided on both sides in the short direction of one end of the instrument frame 100 in the longitudinal direction, and terminals 51a and 51b are provided on both sides of the other end. Movable pieces 52a and 52b extending from the terminals 50a and 50b to the vicinity of the terminals 51a and 51b in the longitudinal direction of the casing 100 are provided. The movable element pieces 52a and 52b are locked to the movable frame 53 at the longitudinal center of the device frame 100, and the movable frame 53 is biased upward so that the distal ends (movable contact points Pa of the movable element pieces 52a and 52b). ) Is pushed upward and pulled away from the fixed contact described later.

  On the other hand, stator pieces 53a, 53b are extended in the vicinity of the terminals 51a, 51b provided at the other end in the longitudinal direction of the container frame to a position overlapping the tips (movable contacts) of the mover pieces 52a, 52b, A fixed contact Pb corresponding to the movable contact is formed at the tip.

  A tripping frame 54 is provided on the movable frame 53 so as to face the longitudinal direction of the instrument frame, and the knob 56 of the snap mechanism is tilted to the ON side for the link plate 55 passed to the movable frame 53 and the tripping frame 54. Thus, the movable frame 53 is pushed down to press the movable contact against the fixed contact.

  The tear-off frame 54 is provided at a longitudinally inner position of the terminals 50a and 50b on the side of the mover pieces 52a and 52b, and is fixed to the mover pieces 52a and 52b on both sides in the short direction of the tear-off frame 54. It is driven by the transition of the bimetal 60.

  Further, permanent magnet pieces 61a and 61b are embedded in the stator pieces 53a and 53b near the contacts in order to scatter arcs generated at the contacts.

  As a result, the contact position generates heat due to the abnormal current, and the tip of the bimetal 60 is displaced due to overheating of the mover pieces 52a and 52b or the stator pieces 53a and 53b, and the tripping frame 54 is pushed in the OFF direction to To come off. Also, when there is poor contact between the terminal and the electric circuit, heat is generated and the tip of the bimetal is displaced.

JP2011-119155A

  When the contact position is close to the terminal position on the stator piece side as described above, the bimetal position fixed near the terminal on the mover piece side is far from the contact position, and the heat generated at the contact position is the bimetal 60. There is a drawback that it takes time to transmit to, and it takes time to pull it off. Further, it is necessary to newly provide a region for embedding the permanent magnets 61a and 61b near the terminal on the stator one side, so that there is a disadvantage that the casing becomes larger.

  In order to solve the above problems, the present invention employs the following means.

  First, the present invention includes a terminal connected to an electric circuit, a stator piece and a mover piece connected to the terminal, and the contact at the tip of the mover piece is in contact with and separated from the contact at the tip of the stator piece. And a driving means that closes the pole. The driving means is premised on a circuit breaker having a movable frame in the longitudinal direction of the device frame, a tripping frame, and a snap mechanism at the center upper portion of the device frame.

  In the circuit breaker, the base end of the bimetal is fixed in the vicinity of the connection position between the stator piece and the terminal, the bimetal is pulled off and raised along both sides in the short direction of the frame, and the bimetal is subjected to temperature deformation. Using the accompanying transition of the tip, the tripping frame is rotated in the direction in which the contact opens, thereby opening the closed contact and blocking the bimetal provided on both sides of the tripping frame in the short direction. A permanent magnet piece for arc scattering is fitted in the heat case.

  A circuit cutoff temperature setting member for adjusting a separation distance between the trip frame and the bimetal before deformation is provided on the trip frame side or the bimetal side.

  When the bimetal is fixed to one side of the stator as described above, the distance between the contact position and the bimetal becomes relatively short, and the time until the heat generated at the contact position is transmitted to the bimetal is shortened. Moreover, by arranging the permanent magnet piece for scattering the arc in the heat shielding case, both sides of the tripping frame can be used as a space for fitting the permanent magnet piece, and the instrument frame can be made small. .

FIG. 1 is a perspective view of the present invention. FIG. 2 is a central longitudinal section of FIG. FIG. 3 is a longitudinal sectional view of the electrode position of FIG. FIG. 4 is a longitudinal sectional view of a conventional contact position.

  FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a central longitudinal sectional view of FIG. 1, and FIG. 3 is a longitudinal sectional view at an electrode position in FIG.

  As in the conventional case, two terminals 10a and 10b in the short direction are provided at one end in the longitudinal direction of the device frame 1, and two terminals 11a and 11b are provided at the other end in the same manner, and are connected to the electric circuit. Yes. Stator pieces 12a and 12b are arranged at the bottom of the casing 1 from the position of one of the terminals 10a and 10b toward the center in the longitudinal direction, and movable from the other terminals 11a and 11b toward the center in the longitudinal direction. Child pieces 13a and 13b are arranged. The tips of the mover pieces 13a and 13b are overlapped at the positions of the top ends of the stator pieces 12a and 12b.

  The contact P is configured to contact and separate by a driving means described below.

  That is, the center part in the longitudinal direction of the mover pieces 13a and 13b is locked to the movable frame 14 standing in the short direction of the instrument frame and upright from the instrument frame, and the movable frame 14 is urged from below by the spring 15. At the time of OFF, the contact points of the movable piece 13a, 13b are separated from the contact point Pa of the stator pieces 12a, 12b.

  On the other hand, a tear-off frame 16 is pivotally attached to a lower shaft 17 at a position facing the movable frame 14 in the longitudinal direction of the instrument frame (on the stator side) and is not shown by a spring (not shown). It is biased to return to the upright position.

  Further, the link plate 19 is bridged across the upper end of the movable frame 14 and the upper end of the tripping frame 16, and the link plate 19 is pressed from above by a snap mechanism.

  That is, when the knob 18 that rotates about the shaft 20 in the short direction is turned from the OFF position to the ON position, the link plate 19 is pushed through the link shaft 21 that is eccentrically attached to the knob 18. The link plate 19 is pressed against the movable frame 14 and the release frame 16. Thereby, the movable frame 14 is pushed down against the spring 15 together with the movable piece 13a, 13b. When the contact Pb at the tip of the movable piece 13a, 13b is pressed against the contact at the tip of the stator piece, the knob 18 rotates to an angle beyond the dead center position, and the contacts are pressed. Stop while keeping the status.

  The base ends of the bimetals 30a and 30b are fixed inside the longitudinal direction in the vicinity of the terminals 10a and 10b on the side of the stator pieces 12a and 12b, and the distal ends of the bimetals 30a and 30b are in the longitudinal direction of the upper end of the tripping frame 16 It is configured to be located on the inside with a predetermined distance from the tripping frame 16.

  The attachment positions of the bimetals 30a and 30b are close to the positions of the terminals 10a and 10b, and are raised along both sides of the tear-off frame 16 in the short direction. Since the thickness of the tear-off frame 16 is considerably larger than the thickness of the bimetals 30a and 30b, both sides in the short direction of the tear-off frame 16 have a margin other than the thickness portions of the bimetals 30a and 30b. The permanent magnet pieces 31a and 31b are fitted into the margin portions so that the arc generated at the contact is scattered.

  Note that the heat generated at the contact point P needs to be transmitted only through the stator pieces 12a and 12b to the bimetals 30a and 30b (in order not to be affected by the ambient temperature). It is contained in the heat shielding cases 40a and 40b. On the other hand, as in the conventional case, the arc generated at the contact point P needs to be scattered as much as possible. For this purpose, permanent magnet pieces 31a and 31b are used as in the conventional case.

  Here, in the present invention, the permanent magnet pieces 31a and 31b are accommodated inside the heat shield cases 40a and 40b (contact side). The heat shield cases 40a and 40b are provided on both sides of the tripping frame 16 in the short direction, and the permanent magnet pieces 31a and 31b are accommodated in the heat shield cases 40a and 40b, and the bimetals 30a and 30b. It will be placed at a position from the center in the longitudinal direction.

  As a result, the permanent magnet can be embedded using the heat shield cases 40a and 40b without providing a region for embedding the permanent magnet in the vicinity of the contact as in the prior art.

  The distance between the tripping frame 16 and the bimetals 30a and 30b can be adjusted by a screw 32 (circuit cutoff temperature adjusting member) attached to the tripping frame 16, so that the timing of tripping can be adjusted. Become.

  With the above-described configuration, the positions of the bimetals 30a and 30b and the contact point P are close to each other, and quick response to heat generation at the contact point position can be ensured. Further, the position of the permanent magnet piece can be accommodated in the bimetallic heat shielding cases 40a and 40b, and the container frame can be made small. Further, as in the prior art, even if heat is generated due to poor contact with the track at the contact position, the blocking effect by the bimetal is not impaired.

  As described above, since the present invention has a bimetal attached to the stator piece side, it can respond immediately to the occurrence of an arc, and the magnet piece can be housed in a bimetal heat shield case, thus reducing the size of the instrument frame. Can be used for DC distribution systems.

10a, 10b, 11a ", 11b Terminals 12a, 12b Stator piece 13a, 13b Movable piece 14 Movable frame 16 Tripping frame 31a, 31b Magnet piece 30a, 30b Bimetal 40a, 40b Thermal insulation case

Claims (2)

A drive having a terminal connected to the electric circuit, a stator piece and a mover piece connected to the terminal, and a contact at the tip of the mover piece is opened and closed by contacting and separating from a contact at the tip of the stator piece A circuit breaker comprising a movable frame in the longitudinal direction of the casing, a tear-off frame, and a snap mechanism at the upper center of the casing,
The base end of the bimetal is fixed in the vicinity of the connection position between the terminal and the stator piece, the bimetal is pulled off and raised along both sides in the short side direction of the frame, and the tip portion is changed due to temperature deformation of the bimetal. The tripping frame is rotated in the direction in which the contact opens, and the closed contact is opened. In addition, the bimetal heat shield case provided on both sides of the tripping frame in the short direction is used for arc scattering. A circuit breaker characterized by having a permanent magnet piece fitted therein. The circuit according to claim 1, wherein a circuit cutoff temperature setting member for adjusting a separation distance between the trip frame and the bimetal before deformation is provided on the trip frame side or the bimetal side. Circuit breaker.

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