JPS5921140B2 - Circuit breakers and disconnection devices - Google Patents

Description

Detailed Description of the Invention (Field of Application) The present invention Vi relates to a circuit breaker tripping device that responds to overcurrents such as overload currents or short circuit currents.

(Problems with the Prior Art) Generally, as shown in Fig. 10, this type of circuit breaker tripping device consists of a centrally supported handle and an actuator connected by a U-shaped linkage. The actuator C moves up and down as it is raised and lowered, and in response to the downward movement of the actuator C, it is displaced using one end as a fulcrum and is constantly biased by a spring force in the direction of the actuator C. The engaging claw at one end of the actuator C engages with the engaging piece of the removal body E, and the movable body Q moves downward in conjunction with the other end of the actuator C.
In conjunction with this movable body Q, the movable contact plate S moves against the spring acting in the direction of opening, and the movable contact L comes into contact with the fixed contact O to close it.

Furthermore, if an overcurrent such as an overload current or short circuit current flows in the electrical circuit from this closed state, the bimetal touch plate detects this overcurrent and warps and drives the other end of the tripping body. There was a method that released the engagement between the engagement claw and the engagement piece, moved the movable body upward by a spring, and opened the closed contacts L and O.

In the case of the above-mentioned problem, when the electric circuit changes from an open state to a closed state...when the movable contact and the fixed contact O come into contact with each other when the electric circuit is brought down, each contact The contact pressure applied to the contact plate is weak, and becomes stronger due to the warping of the movable contact plate as the handle and the movable body move forward, resulting in a time delay until the predetermined contact pressure is applied. When an overcurrent phenomenon such as an overload current or a short circuit current occurs simultaneously with closing, the contact pressure is still insufficient, and the contact may be roughened and welded.

Furthermore, an overcurrent flows through the circuit in the closed state, causing the engagement piece of the tripping body E to disengage from the engagement claw T of the actuator C, and each of the closed contacts L and O open. When connecting each contact point,
After the warpage of the movable contact plate that was applying contact pressure to O has recovered, the movable contact L opens from the fixed contact O, resulting in a time delay from the closed state to the open state. .

(Object of the present invention) In view of the above points, the present invention provides a spring that is compressed between the actuator and the movable body and compresses with a force greater than the reaction force of the spring when each contact comes into contact with the spring. As a result, when the fixed contact and the movable contact are closed, the spring force acts all at once, and each contact secures sufficient contact pressure to prevent the contact from closing when the phenomenon of closing and overcurrent in the circuit overlaps at the same time. The purpose is to reduce roughness and welding, and to reduce the time delay from the closed state to the open state when an overcurrent flows in the electrical circuit in the closed state.

(Example) The following drawings 1 to 9 show the present invention as an example.
To explain based on the drawings, reference numeral 1 denotes a circuit breaker body, which is composed of a body 2 and a cover 3.

Reference numeral 4 denotes a terminal device which is fixed to the left and right front and back sides of the container body 1, and the terminal plate 5 of the left terminal device 4 is fixed to the body 2 with rivets 6 and has a fixed contact T.

Note that the terminal plate 8 of the right terminal device 4 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 handle, which is centrally supported by a pin 13 and fixed to the fixing plate 10.

Reference numeral 14 denotes a spring spring installed in the bundle 12, one end of which is hooked to the fixing plate 10, and the other end of which is hooked to the bundle 12, which acts in the opening direction when the bundle 12 is rotated clockwise. .

Reference numeral 15 denotes an actuator, which has an engaging claw 16 at one end, is connected to one end of the bundle 12 by a U-shaped link 1T, and moves up and down as the bundle 12 is raised and lowered.

Reference numeral 18 denotes a spring, and one end 18a is connected to the engaging claw 1 of the actuator 15.
The other end 18b is elastic with respect to the other end of the actuator 15, and the one end 17 of the U-shaped link 17 is fixed to the 6 side by welding.
It is condensed by a.

Reference numeral 19 denotes a movable body that comes into contact with the other end 18b of the leaf spring 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;

A spring 22 is compressed between the body 2 and the movable contact plate 21, and always acts in a direction to open the fixed contact I and the movable contact 20.

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 spring; one end is hooked on the fixed plate 10, and the other end is hooked on the tripping body 23, so that the spring 26 is always aligned, and the spring 23 is connected to the actuator 1.
The spring force is applied in the direction of 5.

27 is a bimetal touch plate, one end of which is connected to the movable contact plate 2.
It is fixed to the body 2 by a screw 28 together with the other end of the wire 1, and a braided wire 9 is connected to the center to prevent the other end from warping and tripping due to heat generated by an overcurrent such as an overload current or a short circuit current in the electric circuit. The other end of the body 23 is driven.

To explain the operation, FIGS. 7a and 7b are in an open state, in which the spring 22 acts in the direction of opening the movable contact plate 21, and the movable contact 20 and the fixed contact 1 are opened. The movable body 19 is pushed upward and is locked by the fixed plate 10.

Furthermore, the bundle 12 is tilted in the opening direction by the spring spring 14 and is locked by the cover 3.
When the actuator 15 is engaged at the upper part, the other end 18b of the spring 18 has a reaction force in the direction of extension against the other end of the actuator 15, and the engaging claw at one end of the actuator 15 16 and the engagement piece 25 of the tripping body 23 are separated.

Furthermore, when changing to the closed state, see Figure 8 a and b from the above state.
As shown in Figure 1, turn the handle 12 to the opposite side,
As the bundle 120 is reversed, the actuating element 15 moves downward, and the engaging claw 16 of the actuating element 15 and the engaging piece 25 of the tripping body engage with each other. 19
moves downward, and in response to this movement, the spring 22 contracts, causing the movable contact 20 and the fixed contact 7 to come into contact.

When the contacts 20 and 7 further come into contact with each other, the other end 18b of the spring 18 contracts toward the other end of the actuator 15 as the handle 12 reverses, and this contraction causes the movable contact 20 and the fixed contact 7 to ! Contact pressure is generated on the r contact, and the reaction force of the spring 220 causes the movable body 19, the actuator 15, the tripping body 23, and the handle 12 to maintain symmetry and lock.

Next, in the ON state shown in FIGS. 8a and 8b, an overcurrent flows through the contact plate 5, the fixed contact 7, the movable contact 20, the movable contact plate 21, the impression plate 27, and the braided wire 9, and the impression plate 27. warps and drives the tripping body 23 to release the engagement between the engagement piece 25 of the tripping body 23 and the engagement claw 16 of the actuator 15, and the movable body 19
The fixed contact I and the movable contact 20 are moved by the spring 22 by destroying the symmetry of the actuator 15, the tripping body 23, and the handle 12.
are opened, resulting in the states shown in FIGS. 9a and 9b.

Furthermore, the handle 12 is reversed by a spring spring 14 built into the handle 12, and the actuator 15 moves upward to reach the open state shown in Figs. γ, a and b.

(Effects) As described above, the present invention is provided with a spring that is contracted between the actuator and the movable body and compresses with a force larger than the reaction force of the spring when each contact comes into contact with each other. Even at the initial stage when the fixed contact and the movable contact come into contact when the contact is closed, a reaction force is already acting on the spring, so that sufficient contact pressure is applied to each contact between the fixed contact and the movable contact. As a result, even if an overcurrent phenomenon such as overload current or short circuit current is superimposed at the same time as closing, it is possible to reduce roughness and welding of each contact compared to conventional ones, and also to maintain close contact. When the electric circuit is in a polar state and an overcurrent flows and the engagement piece of the tripping body and the engagement claw of the actuator are released and the contact is opened, the actuator and the tripping element that were applying contact pressure to each contact point. Since the reaction force of the spring between the body and the body disappears at once when the engagement between the engagement piece and the engagement claw is released, the movable contact quickly opens from the fixed contact due to the spring acting in the opening direction.
The time delay from the closed state to the open state is reduced, so the arc between the contacts that occurs when the contacts open can be reduced, and the roughness and welding of the contacts caused by this arc can be reduced. be.

[Brief explanation of drawings]

Figures 1 to 9 show an embodiment of the circuit breaker tripping device of the present invention, with Figure 1 being a top view of the circuit breaker, Figure 2 being a front view, and Figure 3 with the cover removed. The removed top view, Figure 4 is a sectional view taken along A-A, Figure 5 is a sectional view taken along B-B, Figure 6 is an exploded perspective view, Figure 1 is an open state, Figure 8 is a closed state, and Figure 8 is a closed state. FIG. 9 shows the tripping state, a of FIGS. 7 to 9 is an overall view of the tripping device, b is a cross-sectional view of the main part, and FIG. 10 is a cross-sectional view of the main part of the conventional circuit breaker tripping device. It is. 1... Vessel, 2... Body, 3...
...Cover, 4...Terminal device, 5...
・Terminal board, 6... Stud, 7... Fixed contact, 8... Terminal board, 9... Braided wire, 10
...Fixing plate, 11...Screw, 12...
...No-ndoru, 13...Pin, 14...
... Spring spring, 15 ... Actuator, 1
6... Engaging claw, 11... U-shaped link, 17a... Single shaft, 18... Spring, 1
8a...One end, 18b...Other end, 19
...Movable body, 20...Movable contact, 21
・・・・・・Movable contact plate, 22 ・・・・Spring, 23
...Tripping body, 24...Shaft, 25...
...Engagement piece, 26...Spring, 2T...
...Emotional board.

Claims (1)

[Claims] 1. An actuator that is linked to the centrally supported raising/lowering handle and moves up and down in response to the lifting and falling of the handle and has an engaging pawl at one end, and an actuator that moves up and down in response to the other end of the actuator. a movable body interlocked with the movable body, a spring that acts in a direction to open the movable contact from the fixed contact, and a retaining piece that engages with the engaging pawl of the actuator, and has one end. A tripping body is always biased with a spring force in the direction of the actuator by a Yoshii V that is displaced around a fulcrum, and a tripping body that is activated in response to an overcurrent such as an overload current or a short circuit current in the electric circuit. In the circuit breaker tripping device, the circuit breaker tripping device comprises a moving plate that drives the other end to release the engagement between the engaging claw and the retaining piece and open each of the closed contacts. A circuit breaker tripping device having a spring that is contracted between the child and the movable body and compresses with a force larger than the reaction force of the spring when each of the contacts abuts.