JPS6136049Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an arc extinguishing device for a breaker.

Conventional breaker arc extinguishing devices are shown in Figures 13 to 1.
The structure was as shown in Figure 4. That is, an L-shaped arc travel plate 31' is electrically connected to a terminal plate 29 to which a fixed contact 28 is fixed, and an arc supporting a contactor 25 to which a movable contact 26 that comes into contact with the fixed contact 28 is fixed. A running plate 32 is installed opposite to the arc running plate 31', and both arc running plates 3
An arc extinguishing grid 45 was disposed between 1' and 32. The arc traveling plate 31' is fixed to the base 38 by bending the two-pronged piece 57 and connecting the two-pronged piece 57 and the horizontal piece 55.
As shown in FIG. 14, the terminal plate 29 was clamped and fixed between the tips of the terminals. Regarding arc travel, a raised beading portion 91 was formed at the center of the vertical piece 56 in the vertical direction. However, in such a conventional example, the arc traveling is performed by the arc traveling plate 31'.
The center of the beading part 9 is preferable as described above.
1 is provided in the center of the vertical piece 56. The narrower the width of the vertical piece 56, the better; However, since the arc traveling plate 31' moves in the horizontal direction, the positioning of the fixed contact 28 and the electrical connection between the terminal plate 29 and the arc traveling plate 31' become unstable.

The present invention has been proposed in view of the above points, and is designed to securely fix the first arc running plate, stabilize the electrical connection between the first arc running plate and the terminal plate, and quickly terminate the arc. The present invention provides an arc extinguishing device for a breaker, which is intended to make the breaker run smoothly.

The present invention will be explained below in detail based on the illustrated embodiment.This breaker has a trip mechanism in the center, and a tripping element, a contact part, and an arc extinguishing device are arranged on each side of the trip mechanism.The trip mechanism will be explained first. As shown in FIGS. 3, 9, and 11, one end of a link 10 is connected to a handle 3 via a shaft 9, which is supported by a shaft 7 on a frame 6. As shown in FIGS. The other end of this link 10 is connected to one end of the latch lever 3 by a movable shaft 11, and the movable shaft 11
is adapted to move up and down along a groove 12 provided in the frame 6. The trip lever 1, which together with the latch lever 3 constitutes a tripping device, is supported by a shaft 18 on a frame 6 at its approximately central portion in the vertical direction. An engaging protrusion 2 that engages with is provided on one side. The upper part of the trip lever 1 extends to both sides, and has an engagement surface 15 with a bimetal 14 as a thermal tripping element, and a movable iron core 1 of an electromagnetic tripping element whose main component is a coil 18.
A pair of engagement protrusions 17 are provided, respectively. A frame 6 is located below the center of the latch lever 3, which has one end connected to the link 10 by a movable shaft 11 and the other end serving as an engaging portion 4 that engages with the trip lever 1.
A drive frame 24 is disposed, which is inserted through a vertically elongated long hole 23 provided in the drive frame 24 . In the figure, reference numeral 5 denotes a contact pressure spring whose one end is welded to the lower surface of the engaging portion 4 side of the latch lever 3 and whose other end reaches above the movable shaft 11, and is in elastic contact with the upper surface of the central portion of the drive frame 24.
Both ends of the drive frame 24 are located at contact portions, respectively.
The lower surfaces of both ends are brought into contact with the upper surface of the contactor 25 as shown in FIG. As shown in FIG. 10, the contactor 25 has a movable contact 26 on the lower surface of one end, a portion near the other end is supported by a shaft 27, and an electromagnetic tripping element on the upper surface of the other end. A return spring 33 of a conical compression spring type disposed between the lower surface of the yoke 19 and the lower surface of the yoke 19 is in elastic contact. The return spring 33 urges the contact 25 so that one end provided with the movable contact 26 rotates upward. A fixed contact 28 facing the movable contact 26 is provided on a terminal plate 29, and is connected to a terminal portion 30 on the left side in the figure by this terminal plate 29. The electromagnetic trip element includes a yoke 19 surrounding the outer periphery of a coil 18 whose axis is arranged in the vertical direction, and a movable iron core 16 and a fixed iron core 20 in a cylindrical body 21 inside the coil 18, and a return spring 22 between them. The upper end of the movable iron core 16 protrudes above the yoke 19, and the lower end, which passes through the fixed iron core 20, is moved downward by the magnetic attraction force generated by the excitation of the coil 18. Time,
It protrudes below the yoke 19 to press and drive the contact 25. The aforementioned bimetal 14 has its lower end fixed to a fixed piece 34 extending from the yoke 19, and the wires are connected from the terminal portion 35 on the right side of the figure through the coil 18 to the stranded wire 36, the bimetal 14, the stranded wire 37, and the contactor 25. electrically connected to.
Note that the screw 72 screwed into the piece bent from the lower edge of the fixed piece 34 is for preparing the bimetal 14, and by turning this screw 72 whose tip is on the lower surface of the yoke 19, the fixed piece 34 is elastically deformed. By this, the tripping by the bimetal 14 is adjusted. In the figure, 38 is a base, 39 is a cover, 40 is a screw for fixing the frame 6, and 41 is a pin for fixing the base 38 and the cover 39.

The arc extinguishing device includes an arc running plate 31 whose one end is connected to the terminal plate 29, an arc running plate 32 forming an arc horn, and both arc running plates 31, 32.
The arc traveling plate 31 is formed into an L-shape by a horizontal piece 55 and a vertical piece 56 narrower than the width of the horizontal piece 55. A hanging piece 94 is provided that projects downward from both sides of the vertical piece 56, and the width of the vertical piece 56 is equal to the inside dimension of both hanging pieces 94, 94. It is formed. Furthermore, bent pieces 93 are formed at both ends of the tip of the horizontal piece 55 by cutting and bending them slightly diagonally downward. At the center of the vertical piece 56, there is a beading part 91 that bulges inward in the vertical direction.
The width l between the protrusions formed above the vertical piece 56 is the same as the width of the horizontal piece 55. Notches 92 into which the bent pieces 93 are fitted are formed on both sides of the tip of the terminal plate 29 to which the fixed contacts 28 are attached. When the arc travel plate 31 is attached to the base 38, the terminal plate 29 is also fixed. That is, the terminal board 29 has a center bottom piece 50 placed on the recess 60 of the base 38, one end of which is a terminal piece 51 for external connection belonging to the terminal section 30, and the other end of which is U-shaped. It is folded back to form a section. Arc running plate 31
To attach the hanging piece 94 to the base 38,
8, the hanging piece 94 is bent as shown in FIG. , the bottom surface of the tip of the horizontal piece 55 abuts the top piece 52 of the tip of the terminal plate 29 , and the bent pieces 93 on both sides of the horizontal piece 55 touch the notches on both sides of the tip of the terminal plate 29 . Fitting into the portion 92,
The arc traveling plate 31 and the terminal plate 29 are fixed to the base 38. At this time, the tip of the horizontal piece 55 is connected to the terminal plate 2.
The terminal plate 29 is placed on the upper surface of the tip of the upper piece 52 of the terminal plate 9, and the terminal plate 29 is clamped and fixed between the horizontal piece 55 and the base 38. Horizontal positioning of the arc running plate 31 is achieved by fitting the hanging piece 94 into the through hole 48 and by fitting the horizontal piece 55
The vertical positioning of the arc traveling plate 31 is determined by the fitting between the bent piece 93 of the terminal plate 29 and the notch 92 of the terminal plate 29, and the vertical positioning of the arc traveling plate 31 is determined by clamping and fixing the horizontal piece 55 and the hanging piece 94. 31 and terminal board 29
Appropriate contact pressure is maintained by the vertical positioning of the electrical connection. The other arc running plate 3
2 is attached to the base 38 via a yoke 19, and the yoke 19 is composed of a U-shaped member 61 and an I-shaped member 62, as shown in FIG. It is assembled by inserting the rib 63 into the engagement groove 64 of the I-shaped member 62, and the fixing piece 34 is formed to hang down from the I-shaped member 62. Further, the I-shaped member 62 is also provided with a two-pronged piece 65, and this two-pronged piece 65 is attached to the base 38.
The tip of the forked piece 65 is fixed by caulking it through a through hole (not shown) on the lower surface of the base 38. The U-shaped member 61 has a movable iron core 1 attached to the center piece 66.
6 has a through hole 67 protruding from its upper end, and a protrusion 69 is provided at the lower end of the outer surface of one side piece 68. Furthermore, projecting pieces 70, 70 extend outward from the upper portions of both side edges of the side piece 68, respectively. 71
is a hole into which the lower end of the fixed iron core 20 fits. One end of the arc traveling plate 2 to be fixed to the yoke 19 has a downwardly bent hanging piece 59, and a pair of supporting pieces 73, 73 extending from both lower side edges of the hanging piece 59 and facing each other. Each support piece 73 is provided with a shaft 27 for supporting the contactor 25. Further, a fitting hole 74 is provided in the lower part of the hanging piece 59 for positioning the arc travel plate 32 with respect to the yoke 19 by fitting with the protrusion 69 of the yoke 19. Arc running plate 32 and yoke 19
The connection is made by arranging the hanging piece 59 on the outer surface of the side piece 68 and fitting the protrusion 69 into the fitting hole 74, and connecting both protruding pieces 70, 7 with the hanging piece 59 between them.
This is done by caulking and bending the 0.
The contactor 25 supported by a shaft 27 provided between the arc traveling plates 32 has a movable contact 26 fixed to the lower surface of one end, the upper surface of the other end is in elastic contact with the return spring 33, and both side edges of the portion near the other end are fixed. A bearing portion 49 is provided on the lower surface of both side edges by curving the portion upward, and a curved portion 47 provided on the upper surface between the bearing portion 49 and one end on the movable contact 26 side is in contact with the lower surface of the drive frame 24. The arc extinguishing grid 45 is a vertical piece 56 of the arc running plate 31.
The side plate 46 is placed on a receiving portion 77 at the upper end and a receiving portion 79 on the upper shaft of the vertical piece 78 of the arc traveling plate 32.

This breaker configured as described above has the first
4 and 11a, the lower end engaging protrusion 2 of the trip lever 1, which is biased clockwise in the figure by the torsion coil spring 42 attached to the shaft 13, is in the latch lever. 3
is engaged with the engaging portion 4 of the latch lever 3 to prevent the upward movement of one end of the latch lever 3, and the other end of the latch lever 3, that is, the movable shaft 11, is also pressed downward by the input from the handle 8, and is pushed downward to the lower end of the groove 12. The shafts 7, 9 and the movable shaft 11 are latched in position. The contact 25 is connected to the drive frame 2 as the latch lever 3 moves downward.
4 compresses the return spring 33 and pushes it down, bringing the movable contact 26 into contact with the fixed contact 28. The contact pressure is maintained by a contact pressure spring 5 which is in contact with the upper center surface of the drive frame 24 and is deflected when the latch lever 3 is lowered.

Next, to explain the trip operation, the bimetal 1 is heated by overcurrent in the on state.
4 pushes the engagement surface 15 of the trip lever 1 to rotate the trip lever 1, and this rotation causes the engagement protrusion 2 and the engagement portion 4 to disengage, as shown in FIG. 11c. As shown, the engaging portion 4 of the latch lever 3 is moved around the movable shaft 11 by the spring pressure of the return spring 33 applied to the contact 25.
Alternatively, the entire latch lever 3 springs upward, and the force to push down the contact 25 via the drive frame 24 and the contact pressure spring 5 is lost, so the contact 25 rotates under the spring pressure of the return spring 33 and opens. will be done. At this time, the handle 8, link 10, movable shaft 1
Even if 1 does not move, the electrode is opened as shown in FIGS. 5 and 11c, so that a so-called trip-free operation can be obtained. In response to a large current such as a short-circuit current, the magnetic attraction force generated in the coil 18 due to this large current moves the movable iron core 16 downward at high speed, causing the trip lever 1 to move as shown in FIG. 11d.
Push up the engagement protrusion 17 with the trip lever 1.
The lower end of the movable iron core 16 directly pushes down one end of the contactor 25, as shown in FIG. The other end on the contact 26 side is moved upward to forcefully and instantaneously open the pole. The arc generated between the contacts at the time of opening is transferred between the arc horn of the arc running plate 32 and the arc running plate 31 by the electromagnetic driving force obtained by this arc current, and enters the arc extinguishing grid 45. The arc voltage is increased and the arc current is interrupted. FIG. 7 shows the state of the contact block during tripping. Since the handle 8 is biased in the off direction (clockwise in the figure) by the return spring 43, the handle 8 is biased when a trip is made or after a trip-free operation. When the pressure is removed, the handle 8 moves to the off position. At this time, the pressing protrusion 44 provided on the handle 8 comes into contact with the upper surface of the latch lever 3 and pushes down one end of the latch lever 3 on the engaging portion 4 side. Handle 8
When the lever is in the off position, the engaging portion 4 of the latch lever 3 and the engaging protrusion 2 of the trip lever 1 are re-engaged and reset, as shown in FIGS. 6 and 11b. When off, the movable shaft 11 is in the groove 1.
2, the movable shaft 11 of the latch lever 3
Since one end of the side is pulled up, the drive frame 24 is not pushed, and the contact 25 is in an open state in which it is rotated clockwise by the spring pressure of the return spring 33, similar to the trip state shown in FIG. It is becoming. Turn the handle 8 to move the movable shaft 11 through the link 10.
When you press down, the engagement protrusion 2 of the trip lever 1
The latch lever 3, which is engaged at one end at the engaging portion 4, presses the drive frame 24 and the contact 25 via the contact pressure spring 5, and is brought into the closed state and returned to the on state.

The function of the arc traveling plate 31 will be explained below. As shown in FIGS. 10 and 12, the beading portion 9 at the center of the vertical piece 56 of the arc running plate 31
1 is raised and the width of the vertical piece 56 is narrow, so that the arc travel that occurs when the fixed contact 28 and the movable contact 26 are separated is unified in the direction of the beading part 91. Then, the arc between the two arc running plates 31 and 32 is extinguished by the arc extinguishing grid 45 by the arc horn provided above the movable contact 26.

As described above, in the present invention, the first arc traveling plate is formed into a substantially L-shape consisting of a horizontal piece on the fixed contact side and a vertical piece on the arc extinguishing grid side, which is narrower in width than the horizontal piece. A hanging piece that protrudes further and is bent and locked into a recess in the base of the breaker, and a bent piece that protrudes from both sides of the tip of the horizontal piece and fits into a notch provided in a terminal plate having a fixed contact. Compared to the case where the vertical and horizontal pieces have the same width, the arc traveling path can be unified in the longitudinal direction of the vertical piece, and the arc can travel quickly. At the top, a fixed contact is provided by fitting a bent piece formed on the horizontal piece into a notch provided in the terminal plate, and a hanging piece also formed on the horizontal piece is bent and locked in the recessed part of the base. The electrical connection and mechanical connection with the terminal board that has been folded is ensured, and the fixation to the base is also ensured.Furthermore, the bent piece is made from both sides of the tip of the horizontal piece, which is wider than the vertical piece, and the hanging piece is also made horizontally. Since it protrudes from both sides of the piece, in other words, by utilizing the difference in width between the vertical piece and the horizontal piece, the bent piece and the hanging piece can be formed into a horizontal piece. This has the advantage that the shape of the first arc traveling plate is simple and the dimensions of the parts can be stabilized.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention when the cover is cut away, Figs. 2 and 3 are longitudinal sectional views when the cover is on, Fig. 4 is a transverse sectional view, and Fig. 5 is a longitudinal sectional view when the cover is not tripped. , Fig. 6 is a vertical cross-sectional view of the contact block when it is off, Fig. 7 is a longitudinal cross-sectional view showing the contact block when it is tripped or off, Fig. 8 is a perspective view of the contact block when it is off with the cover removed, and Fig. 9 is a trip mechanism. Fig. 10 is an exploded perspective view of the contact block and tripping element, Fig. 11 a, b, c, d, and e are diagrams for explaining the operation of the same, Fig. 12 is the arc traveling plate of the same. Fig. 13 is an exploded perspective view of a conventional arc extinguishing device, and Fig. 14 is a sectional view of main parts showing the same arc traveling plate fixed to the base. , 26 is a movable contact, 28 is a fixed contact,
31 is a first arc traveling plate, 32 is a second arc, 45 is an arc extinguishing grid, 55 is a horizontal piece, 56 is a vertical piece, 92 is a notch, 93 is a bent piece, 94 is a hanging piece, 95 is a Indicates a recess.

Claims (1)

[Scope of utility model registration request] A first arc running plate having one end connected to a terminal plate having a fixed contact, and a second arc running plate having one end electrically connected to a movable contact, between the other ends of both arc running plates. In an arc extinguishing device for a breaker equipped with an arc extinguishing grid, the first arc traveling plate is formed into a substantially L-shape consisting of a horizontal piece on the fixed contact side and a vertical piece on the arc extinguishing grid side that is narrower in width than the horizontal piece. At the same time, a hanging piece that protrudes from both sides of the horizontal piece and is bent and locked in a recess in the base of the breaker, and a notch that is provided in a terminal plate that protrudes from both sides of the tip of the horizontal piece and has a fixed contact point fits into the hanging piece. the first folded piece
An arc extinguishing device for a breaker, characterized in that it is provided on an arc running plate.