JPS5836114Y2 - circuit breaker - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement in circuit breakers.

In conventional circuit breakers, the mechanical part that opens and closes the circuit breaker and the conductive part that allows current to flow are integrally constructed, which makes assembly difficult and increases costs.

The object of this invention is to provide a circuit breaker that can be easily assembled by making it possible to separate the mechanism section that opens and closes the circuit breaker from the conductive section that conducts current.

An embodiment of this invention will be described below with reference to the drawings.

In Fig. 1, 1 is a base molded from an insulating material;
One end of a fixed contact conductive plate 3 that extends toward the center of the base and is fitted into the base 1 is fixed to the surface of one end of the base 1, and an external electric wire (not shown) is attached to this fixed part.
A fixed contact 4 is provided on the other end of the conductive plate 3 at the center of the base, and a terminal for connecting an external electric wire is provided on the other end surface of the base 1. A terminal plate 6 with screws 5 is attached.

Reference numeral 7 denotes an electromagnet with an oil dashpot for automatic trip mounted in the base 1 close to the terminal plate 6 side, and includes a pipe 7a incorporating a fully electromagnetic time-delay trip element, and a pipe 7a attached to the pipe 7a. It is composed of a wound electromagnetic coil 7b and an L-shaped yoke 8 forming a magnetic circuit, and the yoke 8 is designed to be inserted into the base 1, and the The pipe 7a is fixed through the bent portion 8C, and a protrusion 8a extending toward the insertion side into the base 1 is formed at the bent base of the yoke 8, as shown in FIGS. 2 and 3. This protrusion 8a has a square hole 8b.
is bored and one end of the movable contact conductive plate 9 is rotatably engaged with this.

That is, the movable contact conductive plate 9 is shown in FIGS. 4 and 5.
As shown in the figure, it has a short shelf shape, and one end of it has the above-mentioned yoke 8.
An engaging portion 9C is formed to be rotatably inserted into the square hole 8b, and a movable contact 10 that comes into contact with and separates from the fixed contact 4 is fixed to the other end 9a, and a spring is attached to the center portion. A receiving portion 9b is formed, and the movable contact conductive plate 9 is connected to the outlet portion 7C of the electromagnetic coil 7b by a flexible copper wire 11 as shown in FIG.

Further, the other sunrise portion 7d of the electromagnetic coil 7b is connected to the terminal plate 6.

Reference numeral 12 denotes a holding plate mounted in the central portion of the base 1 so as to be slidable in the direction of rotating the movable contact conductive plate 9 (left-right direction in FIG. 1), and this holding plate 12 is made of an insulating material. As shown in FIGS. 6 and 7, window holes 12a, 12b, through which the movable contact conductive plate 9 is inserted, correspond to, for example, a three-pole circuit breaker,
12 C, and protrusions 12 d to 12 f for spring receiving are formed on one end wall surface of each of the window holes 12 a to 12 C, and the window holes 12 a, 12 b, and 12
Notches 12g and 12h for mounting springs are formed on the insertion side end surface located between b and 12c, and guide grooves 12 are formed on both sides of the holding plate 12 located on both sides of the window hole 12b.
i to 121 are formed.

The presser plate 12 configured in this way has a cutout 12
It is slidably attached by engaging the guide grooves 12i to 121 with the guide surfaces 1a and lb of the base 1 as shown in FIG.
A separation spring 13 is inserted between 2g and 12h and the inner wall surface of the base 1 facing them to bias the presser plate 12 in the direction of ejecting from the guide surfaces 1a and 1b. The movable contact conductive plate 9 is rotatably held at 8.
The swinging side of the holding plate 12 is connected to the window hole 12b (window hole 12a).
, 12 C) to connect the conductive plate spring receiving portion 9b and the spring receiving protrusion 1 of the window hole 12b.
A pressure spring 14 is inserted between 26 and 26, and this spring 14 biases the movable contact conductive plate 9 in the counterclockwise direction using the engagement part with the yoke 8 as a fulcrum, and at the same time, the circuit breaker is in the closed state. , the movable contact 10 is pressed against the fixed contact 4.

In FIG. 1, reference numeral 15 is a frame for supporting the opening/closing mechanism installed in the center of the base 1 facing the presser plate 12, and this frame 15 is as shown in FIGS. 8 and 9. It is bent into a U-shape, and a pin hole 15a for supporting the handle is formed in the right side edge of the side plates 15f and 15g, and the side plates 15f and 15g have pin holes 15a for pivoting the handle.
, 15g is formed with an arcuate elongated hole 15b having a desired radius centered on the pin hole 15a, and further formed in the elongated hole 15g.
A horizontal elongated hole 15d is located below the elongated hole 15d, and a side plate 15 on the presser plate 12 side is located in the horizontal direction of this elongated hole 15d.
Pivot pin holes 15C are formed at the extended ends of f and 15g, respectively, and cuts for preventing the presser plate from slipping out and for link escape are formed at the edges of the side plates 15f and 15g, which the end surface of the presser plate 12 comes into contact with. A cutout 15e is formed.

Reference numeral 16 denotes a manual handle, which, as shown in FIGS. 10 and 11, includes an operating portion 16a, a shaft hole 16b drilled in the pivot base,
The manual handle 16 configured in this manner includes a spring housing recess 16d concentric with the shaft hole 16b and a link connection hole 16C drilled in the protruding portion of the pivot base, as shown in FIG. Pin 1 inserted into shaft hole 16b
7, the manual handle 16 is biased in the opening direction (the state shown in FIG. 1) by a torsion spring 18 rotatably attached to the pin hole 15a of the frame 15 and installed in the recess 16d of the pivot base. In addition, the operating portion 16a is made to protrude outward from the opening of the cover 19 fixed to the base 1.

Further, a bent portion 20a at one end of a U-shaped link 20 (see FIGS. 12 and 13) is slidably engaged with the arc-shaped elongated hole 15b of the frame 15, and the new bent portion 20a is It is rotatably connected to the connection hole 16C of the manual handle 16, and the other end bent portion 20b projects into the notch 15e of the frame 15, and is formed on the frame abutting end surface of the presser plate 12. It is engaged with the retaining portion 12m.

21 is a plate 1 holding down the other end bent portion 20b of the link 20.
One end of this lever 21 is connected to the frame 1 by means of a pin 22.
A torsion spring 23 is attached to this pivot portion, and this spring 23 causes the lever 2 to rotate.
1 by applying a counterclockwise force to the link bending portion 20 b
is pressed against the retaining portion 12m of the presser plate 12.

Further, reference numeral 24 denotes a link for automatic tripping which is rotatably pivotally connected to the frame 15 by a pin 25. One end of an engaging piece 26 is connected to the upper end of this link 24, and the other end can be moved horizontally. It is slidably engaged with the elongated hole 15d of the frame 15 and detachably engaged with the swinging end of the lever 21, and furthermore, the lower end of the link 24 is connected to the base pole of the circuit breaker at the same time. A common tripping rod 27 is fixed to the yoke 8, and the upper end of the movable iron piece 28 connected to this tripping rod 27 is connected to the yoke 8.
The movable iron piece 28 is rotatably connected to the electromagnet 7 by a spring 29 so as to be kept apart from the magnetic pole face 7a' of the electromagnet 7 at all times.

Further, 30 is a tea ion arc extinguishing chamber provided in the installation part of the fixed contact 4.

Next, the operation of this device configured as described above will be explained.

In the circuit breaker in the off state as shown in FIG. 1, the holding plate 12 is held at the stop position where it abuts the notch 15e of the frame 15 pressed by the separation spring 13.

Therefore, the movable contact conductive plate 9 is connected to the protrusion 1 of the holding plate 12.
2n, it is rotated to the state shown in FIG. 1, and separated from the fixed contact 4.

Next, when the manual handle 16 is rotated in the direction of arrow A, the bent portion 20a at one end of the link 20 is slid downward along the elongated hole 15b, and at the same time, the bent portion 20a at the other end of the link 20 is slid downward.
While b slides on the lever 21, the holding plate 12 is opened and pushed into the base 1 against the armature 13.

Accordingly, the movable contact conductive plate 9 held by the spring 14 is rotated counterclockwise about the engagement portion with the yoke 8 as a fulcrum, and the manual handle 16 is rotated to the position of the person. Then, the movable contact conductive plate 9 is in the state shown in FIG.
The movable contact 10 is pressed against the fixed contact 4 to close the circuit breaker.

At this time, the design is such that a gap is created between the protrusion 12n of the holding plate 12 and the protrusion 9e of the movable contact conductive plate 9.

Therefore, the contact pressure P between the fixed contact 4 and the movable contact 10 is P-(spring force of the pressure spring 14)×(spring receiving part 9
b and the distance between the engaging portion 9C)/(distance between the end portion 9a and the retaining portion 9C).

Furthermore, the current in the human state in FIG. flows along the route of

On the other hand, if the overcurrent flowing through the electromagnetic coil 7b continues due to overload or the like, the electromagnet 7 with the oil dashpot attracts the movable iron piece 28.

Therefore, as the movable iron piece 28 rotates, the link 24
rotates clockwise, and at the same time, the retaining piece 26 moves in the direction of the arrow in FIG. 14 and is removed from the swinging tip of the lever 21.

Then, the lever 21 moves around the pin 22 as shown in FIG. Rotates clockwise.

As a result, the link 20 comes off from the retaining portion 12m of the holding plate 12, and the holding plate 12 moves from the state shown in FIG. 14 to the state shown in FIG. 1, and the circuit breaker is automatically opened.

As described above, according to the circuit breaker of this invention, the breaker opening/closing operation mechanism attached to the frame 15, the movable contact conductive plate inserted and held through the window hole of the holding plate 12, and the fully electromagnetic type Since the oil dashpot electromagnet part can be completely separated without any caulking or pinning, assembly can be done for each block, which not only simplifies assembly, but also reduces assembly time and assembly costs. It has the effect of significantly reducing

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing the overall structure of the circuit breaker according to this invention, Fig. 2 is a plan view of the yoke according to this invention,
3 is a side view thereof, FIG. 4 is a front view of the movable contact conductive plate according to this invention, FIG. 5 is a side view thereof, and FIG.
Figure 7 is a plan view of the presser plate in this invention, Figure 7 is a side view thereof, Figure 8 is a side view of the frame also in this invention, Figure 9 is a bottom view thereof, and Figure 10 is a manual handle in this invention. The side view, Figure 11 is the bottom view, and Figure 12 is the bottom view.
13 is a front view of the link in this invention, FIG. 13 is a side view thereof, and FIG. 14 is an explanatory diagram showing the operating state of the circuit breaker in this invention. 1...Base, 4...Fixed contact, 7
・・・・・・Electromagnet with oil dashpot, 7b・
...Electromagnetic coil, 8...Yoke, 9...
... Movable contact conductive plate, 10 ... Movable contact, 12 ... Pressing plate, 12 b ... Window hole, 13 ... Opening Spring, 14...Press spring, 15...Frame, 15b...Concave arc-shaped elongated hole, 16...Manual handle, 2o, curve, link, 21... ... Lever, 24 ... Automatic pull link for sushi, 26 ... Engagement piece, 28 ...
...Movable piece of iron.

Claims (1)

[Scope of utility model registration request] a base; a fixed contact mounted on the bottom of the base; an electromagnet with an oil dash pot for automatic pulling that is mounted in the base and has a yoke for forming a magnetic circuit; and the bottom of the base of the yoke. A movable contact whose one end is rotatably engaged with a square hole formed in a side-extending protrusion, has a spring receiving part in the center, and whose other end is removably opposed to the fixed contact. a movable contact conductive plate electrically connected to the electromagnetic coil of the electromagnet; a presser plate having a window hole through which the conductive plate is inserted; and a presser plate slidably disposed within the base; a separation spring that is inserted between the plate and the bottom of the base and urges the holding plate in a direction opposite to the bottom of the base; and a spring receiving part of the movable contact conductive plate and a spring receiving protrusion of the holding plate. a press spring interposed between the movable contact and press the movable contact toward the fixed contact; a frame that supports the presser plate in a removable manner and is fixed to the base; and a frame rotatably pivoted to the frame. a manual handle, one end of which is connected to the manual handle, and the other end of which is separably engaged with the presser plate, converting rotational movement of the manual handle into linear movement to press the presser plate toward the bottom side of the base; a link, a lever that is pivotally connected to the frame and holds the bent portion of the other end of the link in the engaging portion of the presser plate, and one end of the lever is removably engaged with the swinging end of the lever; The automatic pulling is performed by a sushi link, a common tripping rod fixed to the other end of the sushiring link, a movable iron piece engaged with this tripping rod and facing the electromagnetic coil, and a movable A circuit breaker comprising a spring provided between an end of the iron piece and the yoke to urge the movable iron piece in a direction away from the magnetic pole face of the electromagnet.