JPS6145337B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit or breaker that responds to overcurrents such as overload currents or short circuit currents.

Generally, in this type of circuit breaker, as shown in FIG. A tripping body that moves up and down and is displaced using one end as a fulcrum in accordance with the downward movement of the actuator 15, and whose upper end is constantly biased by a spring force in the direction of the actuator 15 by a biasing spring 26. 23 and the engaging claw 26 at one end of the actuator 15 engage with each other, and the movable body 19 moves downward in conjunction with the other end of the actuator 15. Interlockingly movable contact plate 2 made of spring material
1 moves against the spring force of the return spring 22 acting in the opening direction, and the movable contact 20 contacts the fixed contact 7 and closes. Furthermore, when an overcurrent such as an overload current or a short circuit current flows in the electrical circuit from this closed state, the bimetal touch plate 27 detects this overcurrent and warps, driving the other end of the tripping body 23. to release the engagement between the engaging claw 16 and the engaging piece 25, and move the movable body 19.
is moved upward by the spring force of the return spring 22,
Each closed contact point 7, 20 was opened.

Therefore, in the above case, when the movable contact 20 and the fixed contact 7 come into contact with each other when the tilting handle 12 is tilted down from the open state to the closed state, each contact 7, The contact pressure applied to the movable contact plate 20 is weak and becomes stronger as the elastic deformation of the movable contact plate 21 gradually progresses as the raising/lowering handle 12 and the movable body 19 advance. In other words, there is a time delay until the specified contact pressure is applied, so if an overcurrent phenomenon such as an overload current or short circuit current occurs at the same time as the contact is closed, the contact pressure is still insufficient. The contacts were rough and sometimes welded. Furthermore, an overcurrent flows through the circuit in the closed state, and the engagement between the engagement piece 25 of the tripping body 23 and the engagement claw 16 of the actuator 15 is released, and each of the closed contacts 7 and 20 opens. At the time of polarization, the movable contact plate 21 that was applying contact pressure to each of the contacts 7 and 20 recovers from its elastic deformation due to warping, and then the movable contact 20 opens from the fixed contact 7.
There was a delay in time from the closed state to the open state.

The present invention has been provided in view of the problems of the prior art as described above, and includes providing a pressing spring piece with a spring constant larger than that of the return spring between the actuator and the movable body, and a movable contact plate. By loosely supporting the base end of the movable contact plate so that the movement of the movable contact plate is not accompanied by deflection, when the fixed contact and the movable contact are closed, the spring force for pressing the contact acts all at once, and each contact This ensures sufficient contact pressure to reduce roughness and welding of each contact when the phenomena of closed pole and overcurrent in the circuit overlap at the same time, and also to reduce the occurrence of roughness and welding of each contact when overcurrent flows in the circuit in the closed state. It is an object of the present invention to provide a circuit breaker or disconnector that reduces the time delay from the closed state to the open state.

The present invention will be explained below with reference to FIGS. 1 to 11 showing one embodiment of the present invention. Reference numeral 1 denotes a circuit or disconnector body, which is composed of a body 2 and a cover 3. Reference numeral 4 denotes a terminal device, which is fixed on the left, right, front, and rear sides of the container body 1, and the terminal device 4 on the left side in the figure
The terminal plate 5 is fixed to the body 2 with rivets 6 and has fixed contacts 7. In addition, at the tip of the terminal plate 8 of the terminal device 4 on the right side, there is a touching plate 2 made of bimetal.
7 is erected, and the upper end of this impression board 27 is connected to the braided wire 9. Reference numeral 10 denotes a fixing plate, which is fixed to the center of the body 2 with screws 11. Reference numeral 12 denotes a lifting handle, which is pivotally supported on the fixed plate 10 by a pin 13. 14 is the tilting handle 1
A spring attached to 2 has one end hooked on the fixed plate 10 and the other end hooked on the tilting handle 12 to bias the tilting handle 12 in a clockwise direction in the opening direction.

Reference numeral 15 denotes an actuator, which has an engaging pawl 16 at one end, is connected to one end of the tilting handle 12 by a U-shaped link 17, and moves up and down as the tilting handle 12 is raised. The configuration in this respect is the same as the conventional example. Furthermore, in the present invention,
A pressure spring piece 18 is arranged in parallel below the actuator 15, and one end of the press spring piece 18 is welded and fixed to the lower surface of the actuator 15 on the engaging claw 16 side. The other end and the other end of the actuator 15 are spaced apart from each other so that a resilient force is generated that compresses the space between them. Note that the actuator may be formed of a spring material, and one end of the actuator may be bent downward into a hairpin shape on the engaging claw side, so that the pressing spring piece is formed integrally with the actuator side. Thus, this pressing spring piece 18 is compressed by one end 17a of the U-shaped link 17. Reference numeral 19 denotes a movable body which abuts the lower surface of the other end of the pressing spring piece 18 and moves up and down in response to the other end of the actuator 15. 20 is a movable contact corresponding to the fixed contact 7; 21 is a movable contact plate having the movable contact 20 fixed to one end thereof, and is interlocked with the movable body 19; 22
is a return spring, which is compressed between the body 2 and the movable contact plate 21, and always acts in the direction of opening the fixed contact 7 and the movable contact 20. Further, this movable contact plate 21 is formed of a rigid metal material or a slightly elastic metal material, and at least does not actively utilize the elastic deformation of this movable contact plate 21 itself. is bent into a substantially Z-shape, and the bent portion 21a of the base of the movable contact plate 21 is inserted into the engagement insertion hole 28 of the body 2 and loosely engaged with the engagement ceiling portion of the engagement insertion hole 28. The bent portion 21a of the base of the movable contact plate 21 can be freely engaged with the movable contact plate 29, so that when the movable contact plate 21 is pushed down by the movable body 19, the engagement ceiling portion 29 and the bent portion 21a are engaged with each other. The movable contact plate 21 rotates using the engaging portion as a pivot point. Reference numeral 23 denotes a tripping body, which is attached to the fixed plate 10 with one end pivotally supported by a shaft 24, and is displaced around the shaft 24, and has an engaging piece 25 in the center that engages with the engaging claw 16 of the actuator 15. has. Reference numeral 26 denotes a biasing spring, one end of which is hooked onto the fixed plate 10 and the other end of which is attached to the tripping body 23.
The tripping body 23 is always spring-biased in the direction of the actuator 15. Reference numeral 27 denotes a contact plate made of bimetal, one end of which is fixed to the body 2 with a screw 30 together with the tip of the terminal plate 8 as described above, and a braided wire 9 is connected to the side surface of the upper movable contact plate 21. The other end of the wire 9 is connected to the movable contact plate 21, and is bent and deformed by the heat generated by overcurrent such as overload current or short circuit current in the electric circuit, so that the other end of the touch plate 27 becomes a tripping body. 2
Drive the other end of 3.

To explain the operation, FIGS. 8a and 9a and 9b are in an open state, and the return spring 22 acts in the direction of opening the movable contact plate 21, and the movable contact plate 21 is not engaged. It rotates clockwise in the figure using the engagement portion between the mating ceiling portion 29 and the bent portion 21a as a pivot point, the movable contact 20 and the fixed contact 7 are opened, and the movable body 19 is pushed upward and fixed. It is locked with a plate 10. Further, the tilting handle 12 is tilted in the opening direction by the spring 14 and is locked by the cover 3, and the locking of the tilting handle 12 locks the actuator 15 at the upper part, and the actuator 15 is integrated with the actuator 15. The other end of the pressing spring piece 18 has a reaction force against the other end of the actuator 15 in the direction of separating them from each other, and the engagement claw 16 at one end of the actuator 15 and the engagement piece 25 of the tripping body 23 is far away.

Furthermore, when making the pole closed state, from the above state, raise and lower the handle 1 as shown in Fig. 8b and Fig. 10a, b.
2 to the opposite side, and as the raising/lowering handle 12 is reversed, the actuator 15 moves downward, and the engagement claw 16 of the actuator 15 and the engagement piece 2 of the tripping body 23 move downward.
5 engages with each other, and the movable body 19 moves downward in response to the other end of the actuator 15. In response to this movement, the return spring 22 contracts and the movable contact 20 and the fixed contact 7 come into contact with each other. Further, when the contacts 20 and 7 come into contact with each other, the pressing spring piece 1
The other end of the actuator 8 contracts toward the other end of the actuator 15, and this contraction generates contact pressure applied to each contact point of the movable contact 20 and the fixed contact 7, and the return spring 22
Due to the reaction force, the movable body 19, actuator 15, tripping body 23, and raising/lowering handle 12 are kept in balance and locked. Furthermore, since the base end of the movable contact plate 21 is loosely supported, there is almost no deflection, as shown in FIG. 10a. FIG. 7 is an explanatory diagram showing how the contact pressure rises when the contacts 20 and 7 are connected. Conventionally, as shown in FIG. 7B, the contact pressure gradually increased over time. On the other hand, since the present invention has the above-described configuration and operation, a rapid increase in contact pressure as shown in Fig. It is reduced to

Subsequently, in the ON state shown in FIG. 8b and FIGS. 10a and 10b, an overcurrent flows from the terminal plate 5 through the fixed contact 7, the movable contact 20, the movable contact plate 21, the braided wire 9, and the moving plate 27. When flowing to the terminal board 8, the impression board 27
is deformed and drives the tripping body 23 to release the engagement between the engagement piece 25 of the tripping body 23 and the engagement pawl 16 of the actuator 15. Therefore, the movable body 19 and the actuator 1
5, the tripping body 23, and the tilting handle 12, the fixed contact 7 and the movable contact 20 are opened by the return spring 22, as shown in FIG. 8c and FIGS. 11a and 11b. state. Thereafter, the spring 14 attached to the lifting/lowering handle 12 reverses the lifting/lowering handle 12, and the actuator 15 moves upward to reach the open state shown in FIG. 8a and FIGS. 9a and 9b.

As described above, in the present invention, a pressing spring piece having a larger spring constant than the return spring that biases the movable contact plate in the opening direction is interposed between the actuator and the movable body, For this reason, even at the initial stage when the fixed contact and the movable contact come into contact when changing from the open state to the closed state, the spring force of the pressing spring piece is already working, and each contact between the fixed contact and the movable contact Even if sufficient contact pressure is ensured and overcurrent phenomena such as overload current or short circuit current occur simultaneously with closing, roughness and welding of each contact is reduced compared to conventional ones. However, when an overcurrent flows in the circuit in the closed state and the engagement piece of the tripping body and the engagement claw of the actuator are disengaged and opened, contact pressure is applied to each contact. The spring force of the pressing spring piece between the actuator and the tripping body disappears at once when the engagement between the engagement piece and the engagement claw is released, so the return spring acting in the closing direction causes the fixed contact to move. The contacts open quickly, and the time delay between the contacts becoming open compared to the closed state is reduced, and the arc between the contacts that occurs when the contacts open can be reduced, and the arc between each contact due to this arc is reduced. It has the effect of reducing roughness and welding, and since the movable contact plate base is loosely engaged with the engagement insertion hole on the bottom of the body, the movable contact plate base is fixed, unlike the conventional example in which the movable contact plate base is fixed. The movable contact plate does not cause the contacts to open and close due to bending deformation, and therefore, when the movable contact plate opens and closes the contacts, the contact pressure increases more rapidly and the time required for the contacts to open is further shortened. It is something.

[Brief explanation of the drawing]

Drawings 1 to 11 show one embodiment of the circuit breakers tripping device of the present invention, FIG. 1 is a top view of the circuit breakers, FIG. 2 is a front view, and FIG. The figure is a top view with the cover removed, Figure 4 is an enlarged sectional view taken along A-A, Figure 5 is an enlarged sectional view taken along B-B, Figure 6 is an exploded reduced perspective view, and Figure 7 is an explanation of the contact pressure rising state. figure,
Figures 8a, b, and c are mechanical views of the main parts in the open state, closed state, and tripping state, respectively; Figures 9a, b are the overall diagram and sectional view of the main parts of the tripping device in the open state, respectively; 10th
Figures a and b are an overall view and a cross-sectional view of the essential parts of the tripping device in the closed state, respectively; Figures 11a and b are respectively an overall view and a cross-sectional view of the essential parts of the tripping device in the tripping state;
The figure is a sectional view of a conventional circuit breaker. 7... Fixed contact, 15... Actuator, 16... Engaging claw, 17... U-shaped link, 18... Pressing spring piece, 19... Movable body, 20... Movable contact, 21...
...Movable contact plate, 21a...Bending portion, 22...Return spring, 23...Tripping body, 25...Engagement piece, 27
. . . Impression board, 28 . . . Engagement insertion hole.

Claims (1)

[Claims] 1. A centrally supported tilting handle, an actuator that is linked to the tilting handle and moves up and down in accordance with the tilting of the tilting handle and has an engaging pawl at one end, and an actuator that responds to the other end of the actuator. a movable body that moves up and down, a movable contact interlocked with the movable body, a return spring that acts in a direction to open the movable contact from the fixed contact, and an engagement piece that engages with the engagement claw of the actuator. a tripping body that is displaced with one end as a fulcrum and is constantly biased with a spring force in the direction of the actuator; In a circuit breaker and a moving plate, which releases the engagement between the engagement claw and the engagement piece and opens the closed contact, the actuator and the movable body are connected to each other. A pressing spring piece with a spring constant larger than that of the return spring is interposed between the two, and the base end of the movable contact plate, which has a movable contact at the tip and is driven by a movable body, is inserted into the engagement insert provided on the bottom of the body. A circuit breaker or breaker that is supported loosely by holes.