JPH0350377B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inertial delay device for circuits and breakers.

This inertial delay device does not immediately interrupt the electrical circuit even if a pulsed overcurrent flows through the electrical circuit, and provides a pure response to the electrical circuit. As a conventional inertial delay device of this type,
For example, as shown in FIG. 9, a support stand 101 is provided on the vessel body 100, a mounting hole 102 is formed in the support stand 101, an inertia disk 103 is placed on the support stand 101, and a driving stud 104 is installed. By press-fitting into the mounting hole 102, the inertia disk 103 is rotatably supported, and the engagement rod 10 provided on the inertia disk 103 is
5 is interlocked and engaged with the detection movable part of the electromagnetic detection element,
By purifying the movement of moving parts during pulse overcurrent,
I tried not to respond immediately.

However, this inertial delay device
Since it is fixed by press-fitting into the rivet 104, it is difficult to set the fitting dimensions with the hole 102 of the vessel body 100, and there is a risk that it may come off due to vibration shock or the like. There was a drawback that the press-fitting work of the driving studs 104 was troublesome and difficult.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an inertia delay device for circuit breakers that is easy to assemble and can reliably support an inertia disk.

The present invention includes a container body formed by joining a pair of covers, an electromagnetic detection element built into the container body to detect a short circuit or an overcurrent, and a circular recess formed on the inner surface of the container body. an inertia disk rotatably accommodated in the circular recess and having an engaging portion that interlocks with the detection movable portion of the electromagnetic detection element; and an inertia disk accommodated in the circular recess. The holding body has a holding part that supports the holding part to prevent it from coming off, and a holding plate part that fixes the holding part by being sandwiched between the inner surfaces of the pair of covers by bringing the pair of covers together.
Therefore, there is no press-fitting of conventional driving rivets, and the inertia disk is simply housed, making assembly simple and easy.Moreover, since the inertia disk is held down by the presser held in the vessel, there is no need to disassemble the vessel. As long as the inertia disk does not come off.

A circuit breaker to which an embodiment of the present invention is applied is shown in FIGS. 1 to 8. That is, 1 is a circuit breaker body, which includes a side plate 2a and this side plate 2.
A pair of one-opening covers 2 made up of upper and lower plates 2a, 2c and left and right side plates 2d, 2e formed on the upper, lower, left and right sides of a are joined together facing each other front and back. 3 is a caulking stud that holds the cover 2 together;
It is inserted through holes 4' formed at the four corners of the top, bottom, left and right of the side plate 2a and tightened. Reference numeral 4 denotes a U-shaped mounting bracket for this circuit and disconnector, which has a mounting screw hole 5 in the center and a hole 6 at both ends for inserting a caulking stud 3. The side plate 2a of the cover 2 is fitted into the groove 7 formed in the hole 7, and the side plate 2a of the cover 2 is fitted, and the caulking studs 3 on the upper left and right sides are inserted between this hole 6 and the hole 4' of the cover 2 to attach it. Reference numeral 8 denotes a holding plate installed inside the container body 1, which includes a vertical substrate 8a.
It consists of a side plate 8b formed by bending the front and rear sides of this vertical board 8a to the right, and a horizontal plate 8c formed by bending the lower side of this vertical board 8a to the left, and a protruding piece 8d at the lower end of the side plate 8b. is fitted into a recessed receiving portion 2f formed at the center of the lower end of the side plate 2a of the cover 2, and this side plate 8
Both ends of the handle pin 10, which is inserted through the hole 9 formed at the upper end of the cover 2 and bridges the side plates 8b, are fixed to the container body 1 by fitting into the hole receiving part 2g formed at the center of the upper end of the side plate 2a of the cover 2. It is. Reference numeral 11 denotes a handle, which is centrally supported by the aforementioned handle pin 10, and one end of which is connected to the upper plate 2 of the container body 1 with an operating end 11a.
The other end protruding from the window hole 1a formed in b is a forked cam end 11b. 12 is handle 1
This is a hole through which the handle pin 10 formed in 1 is inserted. Reference numeral 13 designates a trip link whose upper end 13a fits into the cam end 11b of the handle 11, and supports both 13a and 11b with a support shaft 14. 15 is a hole formed in the cam portion 11b of the handle 11 through which the support shaft 14 is inserted, and 16 is a hole formed in the upper end 13a of the trip link 13 through which the support shaft 14 is inserted. Reference numeral 17 denotes a return spring for the handle 11, which holds the handle pin 10 by inserting it into the winding part 17a, hooking one end 17b of the winding part 17a onto the side plate 8b of the holding plate 8, and hooking the other end 17c onto the support shaft 14. Hang it on the handle 11
A counterclockwise spring force is imparted to the . Reference numeral 18 denotes a link, which is composed of front and rear side plates 18a and 18b and a connecting plate 18c that connects the upper right sides of the front and rear side plates 18a and 18b.
18d and 13b are pivoted using rivets 19. 20 is a hole through which a caulking stud 19 formed in the link 18 is inserted; 21 is a trip link 13;
This is a hole through which a caulking stud 19 formed in the hole is inserted. Therefore, the trip link 13 rotates around the rivet rivet 19, and in this rotation, the clockwise rotation is caused by the upper end 13a and the lower end 1 of the trip link 13.
The link 18 is stopped at a position where the stopper piece 13c formed between the link 18 and the connecting plate 18c of the link 18 comes into contact with each other. Reference numeral 22 is a trip lever consisting of a lever part 22a and a shaft part 22b fixed to one end of this lever part 22a, and a notch part 22c with a semicircular shaft cross section is formed in the center of this shaft part 22b. There is. Furthermore, this shaft portion 22b is inserted into the hole 23 formed at the upper left end of the link 18, and the shaft portion 22b is inserted into the hole 23 formed at the upper left end of the link 18.
An E-shaped retaining ring 24 is fitted at the end of the retaining ring 24 to prevent it from coming off. Reference numeral 25 denotes a trip lever spring spring, which has a winding portion 25a through which the shaft portion 22b of the trip lever 22 is inserted and held, one end 25b of the winding portion 25a is hooked onto the side plate 18a of the link 18, and the other end 25c is connected to the trip lever spring 25. 22, and applies a clockwise spring force to the trip lever 22 around the shaft portion 22b. 1
8d is a trip lever 22 formed on the link 18
Triple lever spring spring 2 that also serves as a rotation stopper
This is the hook piece number 5. The lever portion 22a of the trip lever 22 is connected to the hook 1 formed on the link 18.
When it is in contact with 8d, this trip lever 22
The hook piece 13d formed at the left end of the trip link 13 is hooked on the shaft portion 22b of the trip link 13, and the rotation of the trip link 13 about the rivet rivet 19 is stopped in both the clockwise and counterclockwise directions. 22 rotates counterclockwise, the hook piece 13 of the trip link 13
d fits into the notch 22c of the trip lever 22, allowing the trip link 13 to rotate. 26 is a movable contact, 27 is a movable contact 26
is a movable contact plate with a
c, and pivotally support both with rivets 28. 2
9 is a hole formed in the side plates 18a, 18b of the link 18 through which the caulking stud 28 is inserted; 30 is a movable contact plate 2;
This is a hole through which the caulking stud 28 formed at 7 is inserted.
The point of this hole 30 becomes the point of action of the opening/closing operation. 31 is a long hole formed at the left end of the movable contact plate 27, 32 is a support shaft that is inserted through this long hole 31, and both ends of this support shaft 32 are inserted into a hole 33 formed at the lower end of the side plate 8b of the holding plate 8. Insert the movable contact plate 27
is pivotally supported on the holding plate 8. Reference numeral 34 denotes an opening spring, which includes coil spring parts 34a, 34b through which a supporting shaft 32 is inserted between the side plate 8b of the holding plate and the movable contact plate 27, and the coil spring parts 34a, 3.
The acting part 34c hooks on the movable contact plate 27 connecting the opposing ends of the coil spring parts 34a and 34.
The hook pieces 34d, 34e are formed on the other end of the holding plate 8 and are attached to the side plate 8b.
34e is hooked onto a key piece 8e formed by bending the lower ends of the side plates 8b inward to apply a counterclockwise spring force to the movable contact plate 27. The movable contact plate 27 is positioned between the side plates 8b of the holding plate 8 without wobbling by the coil spring portions 34a and 34b of the opening spring 34. 35 is a fixed contact that separates from the movable contact 26; 36 is an inverted L-shaped terminal plate with the fixed contact 35 fixed at one end; Fix it. Reference numeral 38 denotes an armature serving as a detection movable part, which includes a substrate 38a, a suction plate 38b formed by bending the upper side of this substrate 38a to the left, and a balancer plate formed by bending the rear side of this substrate 38a to the right. 38c and an action plate 38d formed by bending the front side of the base plate 38a left and right.The balancer plate 38c and the action plate 38d are fitted into the middle between the side plates 8b of the holding plate 8 and attached to the support shaft 39. The armature 38 of the holding plate 8 is pivotally supported. 40 is amateur 3
8 is a hole through which the support shaft 39 formed on the balancer plate 38c and the action plate 38d is inserted, and 41 is a hole through which the support shaft 39 formed on the side plate 8b of the holding plate 8 is inserted.
Reference numeral 42 denotes an armature spring; a winding portion 42a is inserted between the balancer plate 38c and the action plate 38d by a support shaft 39 and held, and one end 42b is hooked to the lower side of the base plate 38a of the armature 38, and the other end is 42c is hooked onto the side plate 8b of the holding plate 8, and a clockwise spring force about the support shaft 39 is applied to the armature 38. The clockwise rotation of the armature 38 is stopped when the protruding piece 38e formed at the lower end of the balancer plate 38c comes into contact with the holding plate 8. 38f
is an extruded protrusion formed at the lower end of the action plate 38d of the armature 38, and
Separates from 2a. 38g is an engagement notch formed at the tip of the balancer plate 38c, which engages with an engagement rod 54 of an inertia disk 53, which will be described later (FIG. 8). 43 is a coil of the electromagnetic detection element, 44 is a coil frame that holds the coil 43 of the electromagnetic detection element, and 45 is a pot, which is connected to the vertical substrate 8a of the holding plate 8 and the horizontal plate 38c.
The coil frame 44 is placed so as to be in contact with the horizontal plate 8c, and the coil frame 44 and the horizontal plate 8c are inserted through the pots 45 and fixed. The pot 45 has a bottomed cylindrical cylinder 45a with a return spring 45b and a movable iron core 45c installed therein, and the cylinder 45a is closed by a head 45d. Note that brake oil or the like may be put into the cylinder 45a. The head 45d of this pot 45 faces the suction plate 38b of the armature 38. Reference numeral 46 denotes a hole into which the cylinder 45a of the pot 45 formed in the horizontal plate 8c is fitted, and the cylinder 45a is fitted and fixed with solder or adhesive. A braided wire 47 connects one end 43a of the coil 43 and the movable contact plate 27. 48 is a terminal plate to which the other end 43b of the coil 43 is connected, and is fitted into a groove 49 formed at the left end of the lower plate 2c of the container body 1 and fixed therein. 50 is a back plate which closes an alarm switch mounting hole 51 formed in the center of the lower plate 2c of the container body 1. Reference numeral 52 denotes a circular ring (the eighth
), it is integrally formed at the center of the inner surface of the side plate 2a of the cover 2 of the container body 1, on the side slightly closer to the fixed contact plate 36. An inertia disk 53 has a thickness comparable to the height of the circular ring 52 and an outer diameter approximately equal to the inner diameter of the circular ring 52, and is rotatably housed in the circular recess 52a. Reference numeral 54 denotes an engagement rod that is integrally protruded from the surface of the inertial disk 53 at a predetermined distance in the radial direction from the center of rotation. Reference numeral 55 denotes a presser body, which includes a presser portion 55a located on the surface of the inertial disk 53 and a circular ring 5.
2, and a pair of arms 55c, 55d extending at right angles to each other to be held on the cover 2 of the container 1. 5
5e is a circular arc slit formed in the holding portion 55a, and when the circular ring 52 is fitted, the engaging rod 5
4 protrudes from the circular arc slit 55e, and the inertial disk 53 rotates within the arc length range of the circular arc slit 55e.
56 and 57 are holding ribs, which are attached to the inner surface 2a of the cover 2.
The arms 55c, 55d of the presser body 55 hold the mounting plate portions 55c', 55d' at the tip, and the mounting plate portions 55c', 55d' are formed on the upper plate 2b and side plate 2e side.
The height dimension of 55d' is the inner surface 2a of the pair of covers 2.
When the cover 2 is assembled, the cover 2 is held integrally with the container body 1 by matching the facing distance (inner width) of The engagement rod 54 interlocks with the notch 38g of the balancer plate 38c of the armature 38 due to the dimensional relationship.

To explain the operating state of this circuit breaker, FIG. It is pressed against the lower end side. Moreover, this rotation is stopped when the left end of the movable contact plate 27 comes into contact with the base plate 8a of the holding plate 8. Furthermore, the operating end 11a of the handle 11 is tilted to the left, and the cam end 11b pulls up the upper side 13a of the trip link 13, and the lower end 13b of the trip link 13 pulls up the upper end 18d of the link 18.
3c and the connecting plate 18c of the link 18 are in contact with each other, and since the trip lever 22 is applied with a clockwise spring force by the trip lever spring spring 25, the hooking piece 13d of the trip link 13 is attached to the shaft portion 22b of the trip lever 22. It's getting stuck. Further, the armature 38 is applied with a clockwise spring force by the armature spring spring 42, and the stopper piece 38e comes into contact with the holding plate 8 and is stopped.

When the handle 11 is tilted to the right from this off state, the cam portion 11b pushes down the upper end 13a of the trip link 13, thereby causing the trip link 1
The hook piece 13d of No. 3 is attached to the shaft portion 2 of the trip lever 22.
2b, the lower end 13b of the trip link 13 pushes down the upper end 18d of the link 18, and this lower end 18e pushes down the movable contact plate 27 so that the support shaft 3
It will rotate around 2. When the movable contact plate 27 rotates and the movable contact 26 comes into contact with the fixed contact 35, the left end of the movable contact plate 27 is pushed down around the contact point Y, and the support shaft 32 moves within the elongated hole 31, causing the return spring 34 to move. Contact 2 with the spring force of
Contact pressure is applied to contacts 6 and 35. Moreover, at this time, a counterclockwise rotational force is applied to the trip link 13 around the rivet rivet 19, and a clockwise rotational force is applied to the link 18 around the rivet rivet 19, so that the link 18 stops in the ON state as shown in FIG. . That is, the handle pin 10 and the caulking stud 28
The support shaft 14 is on the left side and the rivet rivet 19 is on the right side with respect to the straight line X connecting the two, and the rotation of the handle 11 is also stopped by the rotational force of the trip link 13. In addition, at this time, the extrusion protrusion 38 of the armature 38
The lever portion 22a of the trip lever 22 faces f. Therefore, by closing the contacts 26 and 35, the terminal plate 36 - fixed contact 35 - movable contact 26 -
Current flows through the movable contact plate 27, the braided wire 47, the coil 43, and the terminal plate 48.

Furthermore, when this current becomes an overcurrent such as a short circuit current or an overload overcurrent, the movable core 45c is attracted to the head 45d by the magnetic flux generated in the coil 43, and the attraction force that attracts the attraction plate 38b of the armature 38 of the pot 45. The suction plate 38b of the armature 38 is finally suctioned. When the armature 38 is sucked, the armature 38 is moved to the support shaft 39.
The inertia disk 53 is rotated through the engagement rod 54 by the engagement notch 38g of the balancer plate 38c with the center of rotation at . That is, the armature 38 rotates in a delayed manner with the rotation of the inertia disk 53, and its extrusion projection 3
8f presses the lever part 22a of the trip lever 22 and rotates this shaft part 22b to open the trip link 1.
When the hooking piece 13d of No. 3 is unlatched, the trip link 13 rotates counterclockwise, resulting in a state as shown in FIG. 6. Furthermore, handle spring spring 1
At step 7, the handle 11 is reversed to the left, and the movable contact plate 27 is further rotated in the opening direction by the return spring 34, returning to the state shown in FIG.

Next, when a pulsed overcurrent flows in the electric circuit, the attraction force of the armature 38 generated in the coil is sufficient to move the armature 38, but the inertia disk 5
3, there is no immediate response and rotation, so if it is within the predetermined pulse width, the amateur 38
does not operate, and the trip lever 22 is not operated, so no tripping operation is performed.

Note that the circular recess of the inertia delay device for a circuit or breaker of the present invention is not limited to the case where it is formed by a circular ring as described above, but may be formed directly on the vessel body.

As described above, the inertia delay device for circuit breakers and circuit breakers of the present invention has a circular recess formed in the container body, an inertia disk accommodated in the circular recess, and an inertia delay device held by the container body. Since the plate is supported so that it does not come out, there is no need to press-fit the conventional driving rivets, and the inertia disk can be held and supported by the presser by simply fitting the pair of covers that house the inertia disk and make up the vessel body. This has the advantage that assembly is simple and easy, and the inertia disk does not come off due to vibration or the like unless the vessel is disassembled, so it can be supported reliably.

[Brief explanation of drawings]

Fig. 1 is a perspective view from above on the right side of a circuit breaker to which an embodiment of the present invention is applied, Fig. 2 is an exploded perspective view of Fig. 1, and Fig. 3 is the main part of Fig. 2. The perspective view, FIG. 4 shows the off state, FIG. 5 shows the on state, and FIG. 6 shows the trip state. In FIGS. 4 to 6, a is a front view with the cover removed, and b is the main FIG. 7 is a cutaway perspective view of a cover showing the inertial delay device, FIG. 8 is an exploded perspective view thereof, and FIG. 9 is an exploded perspective view of a conventional example thereof. DESCRIPTION OF SYMBOLS 1... Instrument body, 2... Cover, 38... Armature serving as a detection movable part, 43... Coil of electromagnetic detection element, 52a... Circular recess, 53... Inertial disk,
55... Presser body, 55a... Presser part, 55c', 5
5d'...Mounting plate part, 56, 57...Retaining rib.

Claims (1)

[Claims] 1 A container body formed by joining a pair of covers, an electromagnetic detection element built into the container body to detect short circuits or overcurrents, a circular recess formed on the inner surface of the container body, and an inertia disk rotatably housed in a circular recess and having an engaging portion that interlocks and engages with a detection movable portion of the electromagnetic detection element; and a support that prevents the inertia disk housed in the circular recess from coming off. and a presser body having a mounting plate portion which is sandwiched between the inner surfaces of the pair of covers and fixes the presser portion by fitting the partial covers together. delay device.