JPS5813573Y2 - circuit breaker - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a circuit breaker.

In a conventional circuit breaker, especially a two-pole circuit breaker for A and B phases, there is a conductive part between the poles of the A and B phases, as shown in Japanese Utility Model Publication No. 49-15742, for example. If there is a mechanism that opens and closes the contact, an insulating space is required between the mechanism and the pole, which makes it difficult to provide a sufficient insulation distance, and the structure becomes bulky.

In view of the above-mentioned drawbacks of the conventional technology, this idea installed the mechanical part in a place with sufficient insulation space to obtain a sufficient insulation distance between the poles of the A and B phases. This prevents arc gas from flowing into the mechanism or other poles even if the button is pressed when the breaker is shut off.

This idea will be explained below with reference to the drawings.

FIG. 1 is a side sectional view showing an embodiment of the circuit breaker according to the invention.

FIG. 2 is a front sectional view showing an embodiment in which the circuit breaker according to the invention is a two-pole circuit breaker.

Corresponding parts in each figure are designated by corresponding reference numerals.

In the configuration shown in FIGS. 1 and 2, the respective components of the conductive part through which current flows and the mechanical part which opens and closes the contacts of the conductive part are attached to the base 1.

Details of the base 1 are shown in FIG.

FIG. 3a is a plan view showing one embodiment of the base 1, and FIG. 3a is a sectional view taken along line bb in FIG. 3a.

The terminal screw 2 is attached to the portion 1-2 shown in FIG. 3 of the base 1, and fixes one end of the fixed contact conductive plate 3 attached to the portion 1-3 of FIG. ) and the fixed contact conductive plate 3 are connected.

A fixed contact 4 is attached to the other end of the fixed contact conductive plate 3.

A circuit breaker rONJ is installed at one end of the movable contactor conductive plate 5.
A movable contact 6 that presses against the fixed contact 4 in the state is attached to the button, and a flexible copper wire 7 is attached near the other end.

A part of the yoke 8 that forms a well-known fully electromagnetic electromagnetic circuit is bent, a square hole 8affi is formed in this bent part, and the other end of the movable contact conductive plate 5 is inserted into the square hole 8a. The movable contact conductive plate 5 is supported so as to be rotatable clockwise or counterclockwise in FIG. 1 around the square hole 8affi.

The cross spar 9 is made of an insulating material common to the two poles of the A and B phases, and a square hole 9a is provided for each pole of the cross spar 9, and the movable contact conductive plate 5 is inserted through the square hole 9a. There is.

Details of the cross spar 9 are shown in FIG.

FIG. 4a is a front view showing one embodiment of the crossbar 9, FIG. 4A is a sectional view taken along line bb in FIG. 4A, and FIG. FIG.

The portion 9-1 of the cross spar 9 slides in the vertical direction along the portion 1-9 of the base 1.

A coiled contact pressure spring 10 is installed in a square hole 9a, and one end is fixed to a projection 9-10 shown in FIG. 4, and the other end is attached to a movable contact conductive plate 5, so that the movable contact conductive plate 5
Since pressure is applied to the base 1 side, the movable contact conductive plate 5 tries to rotate counterclockwise with the center of the square hole 8affi of the yoke 8 toward the center of FIG. 9
a and the square hole 8a of the yoke 8.

Therefore, the separation distance between the movable contact 6 and the fixed contact 4 is maintained at the rOFFJ state of the circuit breaker.

FIG. 1 shows the state just before entering the rONJ state.

The coiled separation spring 11 has one end fixed to a large part 1-11 of the base 1 shown in FIG. 3, and the other end fixed to a protrusion 9p in a large part 9-11 of the cross spar 9 shown in FIG. , has a function of constantly separating the movable contact conductive plate 5 inserted into the square hole 9a of the crossbar 9 from the fixed contact conductive plate 3.

As is well known, the de-ion arc extinguishing chamber 12 extinguishes the arc generated when the fixed contact 4 and the movable contact 6 are separated from each other.

The fixing fitting 13 consisting of a screw is attached to the base 10 shown in FIG.
Attach cover 14 to base 1 by buttoning section 1-13.

Details of the cover 14 are shown in FIG. Figure 5a is cover 1
4), FIG. 5 is a back view showing one embodiment of FIG.
It is a sectional view taken along line bb of .

In FIG. 5, the fixing fitting 13 shown in FIG. 1 is screwed into the fixing screw portion 14-13 to attach the cover 14 to the base 1.

Mechanism unit 15 that opens and closes the fixed contact 4 and the movable contact 6
and a frame 16 that connects the components of this mechanism section 15.
The details are shown in FIGS. 6 and 7.

FIG. 6a is a side view showing one embodiment of the mechanism section 15,
FIG. 6 is a bottom view of FIG. 6a.

FIG. 7a is a side view showing one embodiment of the frame 16, and FIG. 7 is a bottom view of FIG. Ta.

In FIG. Tah and FIG. It is composed of two parallel parts having elongated holes 16-20, etc., and an inner wall connecting the two parallel parts.

As shown in FIGS. 1, 2, 6, and 7, the link 17 is constructed by making a round bar into a U-shape, and one of the parallel parts of the link 17 is connected to the elongated hole 16 of the frame 16 shown in FIG. -17, and converts the rotational movement of the manual handle 18 into a linear movement, and the link 1 at the engaging portion 9-17 shown in FIG.
7 engages with the cross spar 9 and presses the cross spar 9 downward as shown in FIG.

As shown in FIG. 1, the contact portion between the button and link 17 and the cross par 9 is offset from the center of the cross par 9 toward the lever 19 side.

Therefore, when the manual handle 18 is rotated counterclockwise as shown in FIGS. 1 and 6a, the other parallel portion of the link 17 slides on the engagement surface with the lever 19, and Press down.

The engaging piece 20 is made of a round bar in a U-shape, and one of its parallel parts engages with a well-known fully electromagnetic release lever 21, and the other parallel part engages with a frame shown in FIG. 1
6 and engaged with the free end of lever 19.

Therefore, the completely electromagnetic release lever 21 is connected to the engagement piece 20.
When the lever 19 is slid in the pulling direction, the engagement piece 20 and the lever 19 are disengaged.

The manual handle 18 is inserted into the groove 14 of the cover 14 shown in FIG.
-22 and the handle pin 22 inserted into the hole 16-22 of the frame 16 shown in FIG. The side opposite to the manual operation section is inserted into the long holes 16-17 of the frame 16 shown in FIG.
is engaged with one of the parallel parts of.

First, the manual handle 18 transmits the opening/closing operation to the link 17 by levering around the handle pin 22.

A feature of the way in which the link 17 and the manual handle 18 are engaged is that, as shown in FIGS. 1 and 6a, the rotation point of the link 17 is a certain distance beyond the tip of the manual handle. It's something I've forgotten.

The handle spring 23 is wound around the handle pin 22, and has one end fixed to the portion 16-23 of the frame 16 shown in FIG. 7, and the other free end engaged with the link 17.

This handle spring 23 is connected to the link 17 and the manual knob 18 by spring force when the circuit breaker automatically disconnects the circuit breaker.
It has a function to automatically return to the OFFJ state.

The lever pin 24 is inserted into the hole 16- of the frame 16 shown in FIG.
24, and rotatably supports the lever 19.

The lever spring 25 is wound around the lever pin 24, and one end is connected to the seventh
It is fixed to the portion 16-25 of the frame 16 shown, and its other free end engages the lever 19.

This lever spring 25 is connected to the lever 1 as shown in FIG. 6a.
Since a counterclockwise rotational force is applied to the lever 9 around the lever pin 24, the lever 19f has a function of automatically returning when the circuit breaker is cut off. 16-1 is the third
The part 16-9 of the frame 16 is fitted into the groove part 1-16 of the base 1 shown in the figure, and the part 16-9 of the frame 16 has the function of a sliding stop to stop the sliding movement when the cross spar 9 is opened. -20' has a function of positioning the securing piece 20.

The inner wall 14 made of an insulating material of the cover 14 shown in FIG.
The mechanism section 15 is housed in a portion surrounded by the inner wall 14h and the cross spar 9.

Next, the operation of the circuit breaker according to this invention will be explained.

Now, when the button is turned to the rOFFJ state of the circuit breaker and the manual handle 18 is rotated counterclockwise as shown in FIG. He overcomes this and pushes down the cross par 9.

When the engagement portion between the link 17 and the manual handle 18 is completely moved at the lower end 1 of the elongated hole 1617 of the frame 16,
The movable contact 6 attached to the tip of the movable contact conductive plate 5 inserted through the square hole 9a of the crossbar 9 comes into pressure contact with the fixed contact 4, an electric circuit is established, and current flows through the circuit breaker. The circuit breaker is in the rQNJ state.

Next, when an overcurrent flows through the circuit breaker, the well-known fully electromagnetic type tripping lever 21 moves the engagement piece 20 in the direction of tripping, so the engagement between the lever 19 and the engagement piece 20 is disengaged, and the lever 19 is rotated clockwise about the lever pin 24 by the force of the crossbar 9 pushed up by the force of the separation spring 11.

Due to the rotation, the engagement between the cross par 9 and the link 17 is disengaged, the retaining portion 9-17 of the cross par 9 becomes free, and the cross par 9 is moved to the base 10 portion 1 by the force of the separation spring 11.
-9.

When the cross spar 9 slides in the opening direction, the movable contact conductive plate 5 inserted into the square hole 9a of the cross spar 90 also moves at the same time.
The movable contact 6 is separated from the fixed contact 4 by rotating around the square hole 8a.

In this case, as described above, the link 17 is a round bar formed into a U-shape, and the rotation point of the link 17 is shifted by a certain dimension from the tip of the manual handle 18. The contact portion between the cross par 9 and the cross par 9 is shifted from the center of the cross par 9 toward the lever 19 side, so that the inner wall of the frame 16 and the cross par 9 can be provided close to each other. 14, the frame 16, and the cross spar 9 can block the entrance of the arc extinguishing chamber 12.

Therefore, the arc gas generated between the movable contactor 6 and the fixed contactor 4 at the time of shutoff becomes difficult to flow into the mechanical parts and the like.

When the button, link 1T and crossbar 9 are disengaged,
Since the link 17 and the manual handle 18 are rotated clockwise around the handle pin 22 by the handle spring 23,
The manual handle 18 automatically enters the rOFFJ state.

As described above, according to this invention, the manual handle 18, the link 17, and the handle spring 23 of the mechanism section 15 are installed between the A and B phase poles of the movable contact 6. Since it is located between the crossbar 9 made of an insulator and the cover 14, a sufficient insulation distance can be obtained as shown in FIG.

Furthermore, since the entrance of the arc extinguishing chamber 120 is blocked by the cover 14, frame 16, and crossbar 9,
The arc gas generated between the contacts at the time of shutoff becomes difficult to flow into the mechanical parts and the like.

Therefore, the mechanical parts etc. are effectively protected from arc gas.

Further, by providing the cover 14 with the inner wall 14h made of an insulating material, there is an effect that arc scum will not flow into other poles even if the button is pressed when the circuit breaker is turned off.

[Brief explanation of drawings]

FIG. 1 is a partial side sectional view showing an embodiment of the circuit breaker according to the invention. FIG. 2 is a front sectional view of FIG. 1. FIG. 3a is a plan view showing one embodiment of the base;
The figure is a sectional view taken along line bb in FIG. 3a. FIG. 4a is a front view showing an embodiment of the crossbar,
Figure 4 is a sectional view taken along line b-b in Figure 4a;
FIG. 4C is a top view of FIG. 4a. FIG. 5a is a back view showing one embodiment of the cover, and FIG.
The figure is a sectional view taken along line bb in FIG. 5a. FIG. 6a is a side view showing one embodiment of the mechanism part, and FIG.
The figure is a bottom view of FIG. 6a. FIG. 7a is a side sectional view showing one embodiment of the frame;
FIG. 7 is a bottom view of FIG. 7a. 1 is a base, 4 is a fixed contact, 6 is a movable contact, 9 is a crossbar, 114 is a cover, and 14h is a cover. Inner wall, 15 is a mechanism part, 16 is a frame, 17 is a link,
18 is a manual handle, 22 is a handle pin, and 23 is a bundle spring.

Claims (1)

[Claims for Utility Model Registration] A manual handle that opens and closes a circuit through rotational motion; a link that converts the rotational motion of the manual handle into linear motion; a frame that holds the manual handle and the link; A crossbar made of an insulator that slides due to the linear motion of the link to open and close the contacts of the conductive parts, an arc extinguishing chamber that extinguishes the arc gas generated from the contacts when the circuit is interrupted, and a crossbar that prevents the conductive parts from being exposed. A cover made of an insulating material that prevents
In this type of circuit breaker, the link is formed by making a round bar into a U-shape, and the manual handle has a distal end portion such that a portion of the link does not protrude from the distal end portion. A pivot point is provided at a point that is inward by a certain distance, one end of the link is inserted into the pivot point, and the contact portion between the other end of the link and the crossbar is connected to the crossbar. The cover has an inner wall made of an insulating material extending in the length direction of the cover, and the frame has two parallel walls. The two horizontal parts of the link include a button and a handle bin, and the manual handle, a bearing part of the handle, and a vertical part of the link are housed between the two parallel parts. are located between the frame and the inner wall of the cover, the manual handle is located approximately in the center of the cover, and the frame is located above one of the contacts. A circuit characterized in that the cover, the frame, and the crossbar block the entrance of the arc extinguishing chamber, and the link is surrounded by the crossbar and the inner wall of the cover. Breaker.