JPS6337455B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mounting structure for a tripping element mounting member of a breaker.

Conventional examples are shown in FIGS. 14 to 16. Attach a tripping element such as a bimetal or movable iron core 16 that drives the trip lever 1 that trips the trip mechanism when an overcurrent or short-circuit current flows, or a coil through which a load current flows that causes the movable iron core 16 to be driven by magnetic attraction. The structure for attaching the yoke 19' as a tripping element attaching member to the base 38 was as follows. The yoke 19' is bent into a substantially L shape and one piece thereof is formed as a leg piece 45',
An elongated hole 58' into which the leg piece 45' of this yoke 19' is inserted is bored in the base 38. Since the breaker has two poles, the hole 58' in the base 38 has two poles.
Individually formed. and leg piece 4 of yoke 19'
5' into the hole 58' of the base 38, and then insert the leg piece 45'
The forked tip of the yoke 19' was bent outward to fix the yoke 19'. However, 1 of yoke 19'
Because it is fixed with one leg piece 45', the yoke 1
If 9' is not stable and tilts as shown by the arrow in Figure 15,
Movable iron core 16 disposed on this yoke 19'
There was also a problem that the overcurrent cutoff characteristics became unstable. Note that 20 is a fixed iron core.
That is, as shown in FIG. 16, when the yoke 19' tilts, the movable iron core 16 also tilts, and the engagement protrusion 17 of the trip lever 1 for tripping the trip mechanism with which the tip of the movable iron core 16 is engaged The top surface of
The dimension L ₁ between the tip of the movable iron core 16 is shorter than the dimension L ₂ between the other engaging protrusion 17 and the movable iron core 16 . Therefore, if the above-mentioned dimensions become short in this way, the acceleration of the movable iron core 16 will not be sufficient, and the impact value required for tripping will become small, which will have an adverse effect on the short-circuit interrupting characteristics such that the tripping will not occur. Furthermore, when the movable iron core 16 comes into contact with the trip lever 1, the tripping load increases, the time required to reach the trip becomes longer, and the overcurrent characteristics change.

The present invention has been provided in view of the above-mentioned points, and is intended to provide a method for mounting a tripping element mounting member of a breaker, with the aim of making it possible to mount the tripping element mounting member on a base in a stable state. It provides structure.

The present invention will be described below in detail based on the illustrated embodiment. This breaker has a trip mechanism in the center, and a tripping element and a contact block are respectively arranged on both sides of the trip mechanism. As shown in FIG. 9, one end of a link 10 is connected by a shaft 9 to a handle 8 which is pivotally supported on the frame 6 by a shaft 7. This link 1
The other end of the latch lever 3 is connected to one end of the latch lever 3 by a movable shaft 11, and the movable shaft 11 is configured 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 attached to a frame 6 with a shaft 13.
The latch lever 3 is supported at its substantially central portion in the vertical direction, and an engaging protrusion 2 that engages with the other end engaging portion 4 of the latch lever 3 is provided on one side of its lower end. The upper part of the trip lever 1 extends to both sides, and engages an engagement surface 15 with a bimetal 14 as a thermal tripping element and a movable iron core 16 of an electromagnetic tripping element whose main component is a coil 18. A pair of protrusions 17 are provided respectively. One end of the latch lever 3 is connected to the link 10 by a movable shaft 11, and the other end is an engaging part 4 that engages with the trip lever 1. The latch lever 3 is inserted into a vertically elongated hole 23 provided in the frame 6 at the lower center thereof. A drive frame 24 is arranged. 5 in the figure has one end welded to the lower surface of the engaging part 4 side of the latch lever 3, and the other end is the movable shaft 1.
1 is a contact pressure spring that reaches above the drive frame 24.
It is in elastic contact with the upper surface of the central part of the 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 lower surface of one end, a portion near the other end is supported by a pair of shafts 27 of the yoke 19, which will be described later, and the upper surface of the other end. A return spring 33 of a conical compression spring type disposed between the yoke 19 and the lower surface of the yoke 19 as an electromagnetic tripping element mounting member is in elastic contact with the yoke 19 . 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, and the base side of the arc traveling plate 31 is bent into an L shape, and a notch 48 formed on the end surface of the arc traveling plate 31 and an L-shaped engagement piece 4 of the yoke 19 are connected to each other.
6 is engaged, and the insertion hole 4 of the arc traveling plate 31
The protruding piece 50 of the vertical piece 47 that protrudes upward from the end of the yoke 19 is inserted through the arc traveling plate 31 and the yoke 19 to be fixedly attached. 32 is an arc extinguishing grid. The electromagnetic tripping element connects the outer periphery of the coil 18, whose axis is arranged in the vertical direction, to the arc running plate 3.
1 and a yoke 19, a movable iron core 16, a fixed iron core 20, and a return spring 22 are arranged between the two in a cylindrical body 21 within a coil 18. Place the upper end on the arc traveling plate 3
1, and the lower end portion passing through the fixed iron core 20 is configured to project downward from the yoke 19 and press the contactor 25 when moved downward by the magnetic attraction force generated by the excitation of the coil 18. It's summery.
The bimetal 14 described above is formed into a flat rectangular shape, and an insertion hole 55 is bored in the lower end thereof, into which the fixing piece 34 extending from the yoke 19 is inserted and attached. From the terminal part 35 on the right side of the figure, through the coil 18, the stranded wire 36, the bimetal 14, and the stranded wire 3
7. Electrically connected to the contactor 25. In the figure, 38 is the base, 39 is the cover, and 40 is the frame 6.
The fixing screw 41 is a female pin for fixing the base 38 and the cover 39.

Next, the mounting structure of the yoke 19, which is a tripping element mounting member, which is the gist of the present invention, to the base 38 will be explained with reference to FIGS. 11 to 13. yoke 1
9 is a pair of leg pieces 4 bent into a substantially U-shape and hanging down.
5 and 45 are formed, and the leg piece 45 is formed in a bifurcated shape and is composed of a notch 66 with an open bottom end and fixing pieces 57, 57 on both sides with this notch 56 as a boundary. Here, the flat portion of the yoke 19 is used as a substrate, and the fixing piece 34 provided on one side of the yoke 19 is used as an attachment piece for attaching the bimetal 14, which is a thermally responsive tripping element. Furthermore, the fixing pieces 57, 57 formed on the leg pieces 45 are bifurcated pieces. On the other hand, a rectangular hole 58 into which the yoke 19 is inserted and fixed is bored in the base 38. Note that, as shown in FIG. 11, since this is a two-pole breaker, two holes 58, 58 are provided. Approximately at the center of the opposing inner wall surface of the hole 58 is a protrusion 59 that engages with the notch 56 of the leg piece 45.
are protruding from each. A tripping element such as an arc traveling plate 31, a coil 18, a bimetal 14, etc. is attached to this yoke 19 as shown in FIG.
Insert it along the inner wall surface of 8. At this time, leg piece 4
The protrusion 59 protruding from the inner wall surface of the hole 58 is engaged with the notch 56 of the hole 58, and the fixing piece 57 of the leg piece 45 is fitted into the base 38 in the direction of the arrow shown in FIG. Fixed at 38. Therefore, as shown in FIG. 13B, the outer surfaces of the leg pieces 45, 45 engage with the inner wall surface of the hole 58, thereby preventing the yoke 19 from tilting. Furthermore, when calibrating the inclination of the bimetal 14 for adjusting overcurrent characteristics, the dimension between the leg pieces 45, 45 can be secured, and a large amount of space can be taken up. Incidentally, by inserting a jig in the direction of the arrows shown in FIGS. 12a and 13b, the overcurrent characteristics are calibrated at the part A of the fixing piece 34 shown in FIG. 7.

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, 52 at both end lower surfaces that contact the contact 25.
A curved convex surface 53 provided on the substantially central upper surface of each contactor 25 is in contact with the contactor 25 .

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 in the coil 18 due to this large current 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. FIG. 7 shows the state of the contact block during tripping. The handle 8 is turned off by a return spring 43 (clockwise in the figure).
Because of the bias applied to the handle 8, when the handle 8 is tripped or when the pressure on 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 comes into contact with the upper surface of the latch lever 3 and the engaging portion 4 of the latch lever 3
Press down on one 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. In the off state, the movable shaft 11 is located above the groove 12, and one end of the latch lever 3 on the movable shaft 11 side is pulled up, so that the drive frame 24 is not pushed, and the trip state shown in FIG. 7 is achieved. Similarly, the contact 25 is rotated clockwise due to the spring pressure of the return spring 33 and is in an open state. Turn handle 8 to link 10
When the movable shaft 11 is pushed down through the contact pressure spring 5, the latch lever 3, which is engaged with the engagement protrusion 2 of the trip lever 1 at the engagement part 4, moves the drive frame 24 and the contact 25 through the contact pressure spring 5. It is pressed, becomes a closed state, and is returned to an on state.

As described above, the present invention provides an electromagnetic tripping element that trips a trip mechanism by driving a movable iron core with the magnetic attraction force of a coil through which a load current flows, and an electromagnetic tripping element that bends in response to heat generated by the load current to trip the trip mechanism. In a breaker in which a thermally responsive tripping element for trip operation is attached to a base via a tripping element mounting member, the tripping element mounting portion is used as a magnetic yoke of the electromagnetic tripping element and a hole is drilled in the base for fixing. a substrate positioned in the hole; a mounting piece for the thermally responsive tripping element positioned in a fixing hole provided on one side of the substrate; a pair of leg pieces hanging from both sides adjacent to one side of the substrate; A pair of bifurcated pieces are fitted into fixing holes of the base formed by providing notches at the tips of the pair of legs, and the tripping element mounting member is attached to the inner wall surface of the fixing holes. A pair of protrusions that are inserted into and engaged with each notch are provided protrudingly, and the pair of bifurcated pieces of the tripping element mounting member are bent and fixed to the base by caulking, so that the tripping element is not easily removed. Inserting the bifurcated pieces of the pair of leg pieces of the element mounting member into the fixing hole of the base, and inserting and engaging the protrusions provided on the inner wall surface of the fixing hole into the notches of the bifurcated pieces, respectively; By bending the bifurcated piece inserted and engaged with the protrusion and caulking and fixing it to the base, the tripping element mounting member can be stably mounted and fixed in the fixing hole of the base without tilting, In addition, since the tilt of the movable iron core attached to the trip element mounting member is eliminated, the dimensions of the movable iron core and the engaged trip lever are constant, and the overcurrent characteristics and short circuit breaking characteristics are improved compared to conventional ones. In addition, since the tripping element mounting member is bent into a substantially U-shape, the overcurrent characteristics of the bimetal which is the tripping element attached to the tripping element mounting member are reduced. When calibrating, a large amount of the space surrounded by the U-shape can be used as a calibration space, which has the effect of making the calibration easier.

[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 trip-free. , 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 is an exploded perspective view showing the mounting state of the base and yoke as above, Fig. 12a and b are the same as the above tripping element. A front view and a plan view of the element; FIGS. 13a and 13b are cross-sectional views and longitudinal cross-sectional views of essential parts showing how the yoke and base are attached; FIG. 14 is an exploded perspective view of the conventional example; FIG. 15 16 is an enlarged sectional view of the main part of the same as above, 14 is a bimetal, 16
is a movable iron core, 18 is a coil, 38 is a base, 45
56 is a notch, 58 is a hole, and 59 is a protrusion.

Claims (1)

[Claims] 1. An electromagnetic tripping element that trips the trip mechanism by driving the movable iron core with the magnetic attraction force of the coil through which the load current flows, and a thermal response tripping element that bends in response to heat generated by the load current and trips the trip mechanism. In a breaker in which a tripping element is attached to a base via a tripping element mounting member, the tripping element mounting member serves as a magnetic yoke of the electromagnetic tripping element and a substrate positioned in a fixing hole drilled in the base. , a mounting piece for the thermally responsive tripping element located in a fixing hole provided on one side of the substrate, a pair of legs hanging from both sides adjacent to one side of the substrate, and a pair of legs at the tips of the pair of legs. a pair of bifurcated pieces that are fitted into fixing holes of the base each having a notch, and a pair of bifurcated pieces that are inserted into the notches of the tripping element mounting member on the inner wall surface of the fixing hole. A mounting structure for a tripping element mounting member of a breaker, characterized in that a pair of mating protrusions are provided in a protruding manner, and the pair of bifurcated pieces of the tripping element mounting member are bent and fixed to a base by caulking. .