JPS641732Y2 - - Google Patents

Description

[Detailed description of the invention] This invention causes the trip mechanism to trip when a large current such as an overcurrent or short-circuit current flows.
This invention relates to the structure of a breaker that can forcibly open a fixed contact and a movable contact and can be tripped by an external signal.

Figures 1 to 12 show a conventional example. This breaker is for single-phase, two-wire use, and has a trip mechanism in the center, and tripping parts and contact blocks on both sides of the trip mechanism. To explain from the trip mechanism, one end of a link 10 is connected to a handle 8 via a shaft 9 to a handle 8 which is pivotally supported on a frame 6 via a shaft 7, as shown in FIGS. 3 and 9. There is. 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 connected to a groove 1 provided in the frame 6.
It is designed to move up and down along 2. The trip lever 1, which together with the latch lever 3 constitutes a tripping device, is supported by a shaft 13 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 16 of a tripping part that uses electromagnetic force with a coil 18 as its main component. A pair of engaging protrusions 17 are provided. One end is connected to a link 10 by a movable shaft 11, and the other end is a trip lever 1.
A drive frame 24 inserted into a long elongated hole 23 provided in the frame 6 is disposed below the center of the latch lever 3, which serves as an engaging portion 4 that engages with the frame 6.
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 blocks, and the lower surfaces of both ends are brought into contact with the upper surfaces of the contacts 25, as shown in FIG. As shown in FIG. 10, the contactor 25 has a movable contact 26 on the bottom surface of one end, a portion near the other end is supported by a shaft 27, and a yoke of a tripping portion is provided on the top surface of the other end. A return spring 33 of a conical compression spring type disposed between the lower surfaces of 19 ₁ and 19 ₂ 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.
Reference numeral 31' denotes an arc traveling plate, which guides the arc caused by the opening of the fixed contact 28 and the movable contact 26 to the arc extinguishing grid 32, which is an arc extinguishing device. The arc is extinguished.
A pair of tripping parts are interlocked by a trip lever 1, and one tripping part is as shown in Fig. 2 and 1.
It has a configuration as shown in Figure 0. That is, the tripping section on the side that detects a large current such as a short-circuit current of the load current has a coil 18 whose axis is arranged in the vertical direction.
The outer periphery of the movable iron is surrounded by yokes 19 ₁ and 19 ₂ , and the movable iron core 16 and the fixed iron core 20 are arranged in the cylindrical body 21 in the coil 18 and a return spring 22 is arranged between them. The core 16 has its upper end protruding above the yoke ₁₉₁ , and the fixed iron core 2
When the lower end portion passing through the yoke 192 is moved downward by the magnetic attraction force generated by the excitation of the coil 18, it protrudes below the yoke ₁₉₂ and presses the contactor 25. The lower end of the aforementioned bimetal 14 is fixed to a fixed piece 34 extending from the yoke ₁₉₂ .
Further, the end portion of the coil 18 is connected to an L-shaped terminal plate 47 of the terminal portion 35. The lower part of the bimetal 14 and the contactor 25 are connected with the stranded wire 37, and the stranded wire 37
The portion connected to the bimetal 14 protrudes toward the terminal plate 47 and is close to the terminal plate 47. Reference numeral 45 denotes an insulating wall provided to ensure insulation between the stranded wire 37 and the terminal plate 47. The insulating wall 45 is integrally provided with the base 38 and projects upward. They are formed identically. Second
The terminal portion 35 on the right side of the figure is electrically connected to the stranded wire 36, the bimetal 14, the stranded wire 37, and the contactor 25 via the coil 18. In the figure, 39 is a cover, 4
0 is the screw for fixing the frame 6, 41 is the base 38
This is a female pin for fixing the cover 39 to the cover 39.

Figures 11 and 12 show the other tripping section, and the coil 1 through which the load current of one tripping section flows.
A coil 54 different from coil 8 is wound around the outer peripheral surface of the cylindrical body 21. The other components have the same configuration as one of the tripping parts, and the tip of the movable iron core 16 engages with the engagement protrusion 17 of the tripping lever 1. Therefore, no matter which tripping portion operates to drive the movable iron core 16, the trip mechanism is configured to trip. Both ends of the coil 54 are connected to an external terminal 55 provided on the side of the base 38 , and an external signal is input from the outside through the external terminal 55 to generate a magnetic attraction force in the coil 54 , which causes the movable iron core 16 to move. The suction drive causes the trip mechanism to trip,
This is for forcibly separating the fixed contact 28 and the movable contact 26. Also, this tripping section does not have a bimetal 14 etc. like the other tripping section,
The contactor 25 is connected directly from the terminal portion 35 via the stranded wire 36.
It is connected to.

Figures 1 to 4 show the on state, and the shaft 1
The lower end engaging protrusion 2 of the trip lever 1, which is biased clockwise in the figure by a torsion coil spring 42 attached to the lever 3, engages with the engaging portion 4 of the latch lever 3 and prevents the upward movement of one end of the latch lever 3. However, due to the input from the handle 8, the other end of the latch lever 3, that is, the movable shaft 11, is also pressed downward and the groove 12 is pushed downward.
It is located at the lower end of the shaft and is latched by the positional relationship between the shafts 7 and 9 and the movable shaft 11. The contact 25 is pushed down by the lowering of the drive frame 24 as the latch lever 3 moves downward, compressing the return spring 33 and pushing down the movable contact 26.
is brought 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. The drive frame 24 has a convex curved surface 51 at its center upper surface that contacts the contact pressure spring 5, and curved concave surfaces 52 at both end lower surfaces that contact the contacts 25. A convex surface 53 having a curved surface is in contact with it.

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 and rotates the trip lever 1. When the engagement projection 2 and the engagement part 4 are disengaged due to this rotation, the engagement part of the latch lever 3 is disengaged. 4 is moved around the movable shaft 11 by the spring pressure of the return spring 33 applied to the contactor 25, or the latch lever 3
The entire body springs upward, and the force pushing down the contact 25 via the drive frame 24 and the contact pressure spring 5 disappears, so the spring pressure of the return spring 33 causes the contact 25 to be pushed down.
rotates to open the pole. At this time, even if the handle 8, the link 10, and the movable shaft 11 do not move, the poles are opened as shown in FIG. 5, 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 by this large current in the coil 18 moves the movable iron core 16 downward at high speed and engages the engagement protrusion 17 with the trip lever 1.
Press down to set trip lever 1 to latch lever 3.
Then, after a slight delay, the lower end of the movable iron core 16 directly pushes down one end of the contact 25, and the movable contact 26 of the contact 25
Move the other end of the side upward to forcefully and instantly open the electrode. In addition, in the other tripping part,
When an external signal is supplied from the external terminal 55, a magnetic attraction force is generated in the coil 54 to attract and drive the movable iron core 16, and performs a tripping operation similar to that of the one tripping section described above to open the pole. 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,
When the handle 8 is tripped or the pressure applied to the handle 8 is removed after a trip-free operation, the handle 8 moves to the off position. At this time, the pressing protrusion 44 provided on the handle 8
is in contact with the top surface of the latch lever 3, and the latch lever 3
Push down one end of the engaging part 4 side. When the handle 8 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 FIG. When off, the movable shaft 11 is located above the groove 12,
Since one end of the latch lever 3 on the movable shaft 11 side is pulled up, the drive frame 24 is not pushed, and the contact 25 is rotated clockwise by the spring pressure of the return spring 33, as in the tripping state shown in FIG. It is in a rotated open state. When the handle 8 is turned and the movable shaft 11 is pushed down via the link 10, the latch lever 3, which engages the engagement protrusion 2 of the trip lever 1 at the engagement portion 4 at one end, moves to the drive frame via the contact pressure spring 5. 24, and presses the contact 25, which brings it into a closed state and returns it to the on state.

In such a conventional example, although the coil 54 excited by an external signal is wound around the outer peripheral surface of the cylinder 21, there is a problem that the magnetic attraction force is insufficient because the number of turns of the coil 54 cannot be large. be. Further, in FIG. 13, since the distance from the trip lever 1 to the suction position by the movable iron core 16 is short, there is a problem that the suction force stroke is insufficient as a=a'. Furthermore, in the structure of the tripping section, it is composed of a U-shaped yoke 19 ₁ , an L-shaped yoke 19 ₂ , and an arc travel plate 31', which makes assembly difficult, and the contact position of the contactor 25,
There was a problem that the positional accuracy of the arc traveling plate 31' was poor.

The present invention has been proposed in view of the above-mentioned points, and aims to improve the magnetic circuit configuration of the tripping section using an external signal, and improve the tripping attraction force and interrupting ability of the breaker. It provides structure.

Embodiments of the present invention will be described in detail below with reference to the drawings.
Note that the components other than the tripping section that generates a magnetic attraction force in response to an external signal to cause the tripping operation are the same as those of the conventional device, and will therefore be omitted, and only the tripping section that is triggered by the external signal will be explained. FIG. 14 shows an exploded perspective view of the tripping part,
In the figure, 19 is a yoke, and the lower part of the yoke 19 is provided with a vertical piece 61, and this vertical piece 61 is attached to the base 3.
8, and the yoke 19 is fixed. Further, an elongated arc running plate 31 is integrally extended upward from one end of the yoke 19. A pair of shafts 27 are formed at the base of the arc travel plate 31, and the contactor 25 is rotatably supported on the shafts 27.
48 is a coil block that is excited by an external signal, and includes a coil frame 59 having a hollow part in the center, a coil 60 wound around this coil frame 59,
It is composed of an iron core 49 that is inserted into the central cavity of the coil frame 59. A hole 63 is bored in the upper part of the arc traveling plate 31, and the iron core 4 is inserted into this hole 63.
9 ends are fixed. The cross-sectional shape of the coil block 48 is rectangular so as to roughly correspond to the arc running plate 31, so that the coil 60 can be wound more often than in a simple cylindrical shape, and the magnetic attraction force can be increased. It's summery. Reference numeral 50 denotes an elastic L-shaped hinge, and one piece of this hinge 50 is fixed to the upper surface of a horizontal piece 62 at the other end of the yoke 19 by welding. The other piece of the hinge 50 is fixed to the lower end of the movable iron piece 57 by welding,
The U-shaped engagement portion 58 at the top of the movable iron piece 57 is the first
As shown in FIG. 5, it is engaged with one engagement surface 15 of the trip lever 1 constituting the trip mechanism. When the coil 60 is not excited by an external signal, as shown in FIG. 15, the movable iron piece 57 is not attracted to the iron core 49 but engages with the trip lever 1, and the fixed contact 28 and the movable contact 26 are closed. has been completed. When the coil 60 is excited by an external signal, the yoke 19, the arc traveling plate 31, the iron core 49, the movable iron core 57, the hinge 50, and the horizontal piece 6
The movable iron piece 57 is connected to the iron core 4.
9 to be driven by suction. Therefore, the movable iron piece 57 is attracted and driven, and the engaging portion 58 drives the trip lever 1, causing the trip mechanism to perform a tripping operation, thereby separating the fixed contact 28 and the movable contact 26. Further, the arc accompanying the opening is extinguished by the arc extinguishing grid 32 via the arc traveling plate 31. By the way, FIG. 16 shows an explanatory diagram regarding the suction force stroke, and by appropriately setting the dimensions l and l', the moving distance b' of the engaging portion 58 of the movable iron piece 57 can be increased, so that b'>b. I can do it.

As mentioned above, the present invention includes one tripping section of the plurality of tripping sections arranged on a base, a yoke that rotatably supports a contactor to which a movable contact is fixed, and one end of the yoke. A coil block is attached to the arc running plate which is integrally extended in the form of a long and narrow plate, is excited by an external signal, and has a cross-sectional shape that roughly corresponds to the arc running plate, and the arc running plate of the yoke is inserted through the coil block. an elastic hinge that is fixed to the other end of the yoke; and a movable iron core whose lower end is fixed to the hinge and whose upper end is engaged with the trip lever. This has the advantage that the distance from the engaging part at the upper end of the movable iron piece to the suction position of the iron core is longer and the suction force stroke can be stronger, compared to the conventional case where the suction force stroke was insufficient. In addition, compared to conventional cylindrical coil blocks, the cross-sectional shape of the coil block roughly corresponds to the elongated shape of the arc running plate, so the coil block can not only be installed easily, but can also be wound with a large number of coils. The yoke can be rotated to increase the magnetic attraction force, improving the tripping attraction force and the breaking ability.Furthermore, since the yoke also serves as an arc travel plate, the component configuration is simplified. This has the advantage of improving the positional accuracy of the fulcrum position of the contactor and the arc traveling plate.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the conventional cover when broken, 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 trip-free.
FIG. 6 is a vertical cross-sectional view when the switch is off, FIG. 7 is a vertical cross-sectional view showing the contact block when it is tripped or off, and FIG. 8 is a perspective view when the switch is off with the cover removed.
Fig. 9 is an exploded perspective view of the trip mechanism, Fig. 10 is an exploded perspective view of the contact block and tripping part, and Fig. 11 is an exploded perspective view of the trip mechanism.
The figure is a cross-sectional view of the main part of the tripping part as above, FIG. 12 is a plan view of the main part as above, FIG. 13 is an explanatory diagram of the same as above,
FIG. 14 is an exploded perspective view of the tripping portion of the embodiment of the present invention, FIG. 15 is a sectional view of the same, and FIG. 16 is an explanatory diagram of the operation of the same. 1 is the trip lever, 3 is the latch lever, 18
is a coil, 19 is a yoke, 26 is a movable contact, 28
31 is a fixed contact, 31 is an arc traveling plate, 38 is a base, 48 is a coil block, 49 is an iron core, 50 is a hinge, 57 is a movable iron piece, and 58 is an engaging portion.

Claims (1)

[Scope of utility model registration request] A magnetic attraction force is generated by a large current such as a short-circuit current flowing through a coil, and this magnetic attraction force drives a movable iron core to trip a trip mechanism consisting of a trip lever, a latch lever, etc. The fixed contact and the movable contact are forcibly separated by the operation of the tripping part, and the arc caused by the separation of the fixed contact and the movable contact is extinguished by the arc extinguishing device via the arc traveling plate. In the breaker, one of the tripping parts is arranged on the base, and a yoke rotatably supports a contactor to which a movable contact is fixed, and one end of the yoke is made into an elongated shape. A coil block is attached to an integrally extending arc running plate, excited by an external signal, and has a cross-sectional shape that roughly corresponds to the arc running plate, and is inserted through the coil block and fixed to the arc running plate of the yoke. The coil block consists of an iron core, an elastic hinge fixed to the other end of the yoke, and a movable iron piece whose lower end is fixed to the hinge and whose upper end engages with the trip lever. A structure of a breaker characterized in that a movable iron piece is attracted to an iron core by excitation, and a trip lever is driven to perform a trip operation.