JPH0136275Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an overcurrent trip device for circuit breakers,
It also relates to electromagnetic devices used in delay relay devices and the like.

2. Description of the Related Art Conventionally, electromagnetic devices used, for example, in overcurrent tripping devices for circuits and breakers are constructed as shown in FIGS. 1 to 4.

In FIG. 1, 1 is a container made of non-magnetic material, and inside this container 1 are a plunger 2 that is movable in the axial direction (vertical direction) of the container, and a brake oil 3.
and a compression spring 4 are loaded, and the upper end serving as a loading port is sealed with an iron piece 5. The compression spring 4 is interposed between the plunger 2 and the iron piece 5, and the plunger 2 is made of a magnetic material. The outer periphery of the plunger 2 forms a gap between the inner periphery of the container 1 and the braking oil.

Reference numeral 6 denotes an excitation coil wound around the container 1, and constitutes a part of the energizing circuit of a circuit breaker (not shown). 7 is an L-shaped yoke.
As shown in FIG. 2, the horizontal part 7a of the yoke 7 is provided with a first through hole 7b, the vertical part 7c is provided with a second through hole 7d, and both sides of the upper end part 7e are provided with a first through hole 7b. Projection pieces 7f, 7f are formed. As shown in FIG. 1, the container 1 is located in the first through hole 7b.
The outer periphery of is fitted and fixed.

Further, in FIG. 1, 8 is a movable iron piece facing the iron piece 5, and its proximal end 8a has a long output piece 8b and a short stopper piece 8c as shown in FIG. is bent, and a third through hole 8d is bored between the output piece 8b and the stopper piece 8c. The movable iron piece 8 engages with the protrusion pieces 7f, 7f of the yoke 7 in the recesses 8e, 8e formed on both sides of the base, and its position is regulated in the left, right, front and rear directions, and the movable iron piece 8 is rotated at the upper end 7e between the protrusion pieces 7f, 7f. Supported for free movement. The lower end of the output piece 8b is arranged so as to come into contact with a trip bar (not shown) connected to a circuit breaker opening/closing mechanism (not shown).

In addition, in FIG. 1, 9 is a tension spring,
As shown in FIG. 3, it is stretched between the second and third through holes 7d and 8d, and urges the movable iron piece 8 in the direction of separating from the iron piece 5. In FIG. 1, the stopper piece 8c of the movable iron piece 8 is connected to the vertical part 7c of the yoke 7.
The movable iron piece 8 is held in a predetermined open position by contacting the movable iron piece 8.

Next, the operation of the above configuration will be explained.

In the state shown in FIG. 1, when an overcurrent flows through the excitation coil 6, the iron piece 5 and the plunger 2 are magnetized due to an increase in leakage magnetic flux, and the plunger 2 is moved toward the iron piece 5 against the brake oil 3 and the compression spring 4. The magnetic force of the iron piece 5 increases. When the plunger 2 reaches a predetermined position, the movable iron piece 8 is attracted to the iron piece 5 against the tension spring 9 (see FIG. 4).
At this time, the output piece 8b of the movable iron piece 8 opens the current-carrying contacts of the circuit and disconnector via the trip bar and the opening/closing mechanism.

When the excitation coil 6 becomes non-excited due to the opening of the circuit breakers and disconnectors, the movable iron piece 8 is separated from the iron piece 5 by the tensile force of the tension spring 9, and the plunger 2 is moved by the tension force of the compression spring 4. Return to original state.

On the other hand, when a large current such as a short circuit current occurs in the exciting coil 6
, the movable iron piece 8 is attracted to the iron piece 5 against the tension spring 9 without straddling the movement of the plunger 2 due to a sudden increase in leakage magnetic flux.
At this time, a strong arc is generated between the opened circuit and the energizing contacts of the disconnector. Since this arc is accompanied by the generation of high-temperature gas, this high-temperature gas acts on surrounding mechanical parts and generates molten metal particles of the component parts, and the molten metal particles are carried away from the direction of arrow D in Fig. 1. It is injected towards the tension spring 9.

Here, as can be seen from FIG. 3, the tension spring 9 is completely exposed in the injection direction of the high-temperature gas, and therefore the high-temperature gas and molten metal particles are directly injected onto the tension spring 9. . In this case, the tension spring 9 is heated by the high-temperature gas, and the molten metal particles adhere to the tension spring 9, causing thermal deterioration of the tension spring 9, resulting in a reduction in operating characteristics, damage, and cutting accidents.

Furthermore, the above is true, for example, in 1983-
The electromagnetic devices disclosed in Japanese Utility Model Publication No. 20919, Japanese Utility Model Application Publication No. 49-122368, and Japanese Utility Model Publication No. 43-13571 also have similar drawbacks.

This idea was made to eliminate the above-mentioned drawbacks, and in order to cope with the jetting of high-temperature gas and molten metal particles caused by the occurrence of arcs in circuits and breakers, a tension spring for separating the movable iron piece was created from this jetting. The purpose is to provide electromagnetic equipment that protects

Hereinafter, embodiments of this invention will be described based on the drawings.

Fig. 5 is a partially cutaway side view of an electromagnetic device according to an embodiment of this invention, Fig. 6 is a view taken along line B-B in Fig. 5, and Fig. 7 is a perspective view of the yoke and movable iron piece. be.
In these figures, parts having the same functions as those shown in FIGS. 1 to 4 are designated by the same reference numerals, and therefore their explanations will be omitted.

The difference between this invention and the conventional example is that an output piece 8 protrudes downward from the base end 8a of the movable iron piece 8 on the vertical outer surface 7g side of the yoke 7, as shown in FIGS. 5 and 6.
b and the vertical portion 7c of the yoke 7, and a tension spring 9 is stretched between the vertical portion 7c of the yoke 7 and the movable iron piece 8. Specifically, as shown in FIG. 7, the movable iron piece 8 is placed near the base of the output piece 8b.
Fourth through holes 8h, 8h are provided in the same plane part 8g as the iron piece suction part 8f, and the fourth through hole 8 of the movable iron piece 8 is provided inside the output piece 8b.
A tension spring 9 is tensioned between h and the second through hole 7d of the yoke 7, and the second through hole 7d of the yoke 7
The contact between the tension spring 9 and the yoke 7 is broken by the elongated hole 7h provided on the top d, and the other configurations are the same as the conventional one.

In addition, to attach the tension spring 9, first, one end of the tension spring 9 is locked to the spring locking portion 8i between the fourth through holes 8h, 8h (see FIG. 7), and then,
Connect the recesses 8e, 8e of the movable iron piece 8 to the protruding piece 7 of the yoke 7.
f, 7f, and then the other end of the tension spring 9 is locked in the second through hole 7d.

Next, the effect will be explained.

In FIG. 5, when a large current such as a short-circuit current flows through the excitation coil 6, a sudden increase in leakage magnetic flux causes the iron piece 5 to resist the tensile force of the tension spring 9 without straddling the movement of the plunger 2. The movable iron piece 8 is attracted, and the output piece 8b opens the current-carrying contacts of the circuit and disconnector as in the conventional case. At this time, a strong arc is generated due to the interruption of the large current, and the generation of this arc causes high temperature gas to act on surrounding mechanical parts, generating molten metal particles of the component parts. The high-temperature gas is then injected toward the tension spring 9 in the direction of arrow D in FIG. 5 along with the molten metal particles. However, since the tension spring 9 is hidden by the output piece 8b as shown in FIG. 6 from the injection in the direction of the arrow D, the tension spring 9 is not directly exposed to the injection of the high temperature gas and molten metal particles. In other words, deterioration in operating characteristics, damage, and cutting accidents due to thermal deterioration of the tension spring 9 are prevented.

As shown in FIGS. 8 and 9, the entire locking end 9a of the tension spring 9 enters into the upper part of the spring locking portion 8j between the through holes 8h and 8h provided in the movable iron piece 8. When the groove 8k is provided, the tension spring 9 is completely hidden from the injection of the high-temperature gas and molten metal particles, which is even more effective.

In the above embodiments, the electromagnet was described as having a configuration in which the plunger 2 moves within the container 1 loaded with the brake oil 3 and the tension spring 9 and operates with a delay, but the electromagnet according to this invention is limited to this. Plunger 2
may be an iron core that does not move. Even in this case, it goes without saying that the portion corresponding to the iron piece 5 forms the magnetic pole surface of the electromagnet.

As can be seen from the above explanation, the electromagnetic device of this invention can deal with the injection of high temperature gas and molten metal particles caused by the generation of arcs in circuits and breakers, and from this injection can be used to separate the movable iron piece. This provides the effect of protecting the tension spring.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a conventional electromagnetic device, Fig. 2 is a perspective view of the yoke and movable iron piece, Fig. 3 is a view taken along the line A-A in Fig. 1, and Fig. 4 is a side view of a conventional electromagnetic device. FIG. 5 is a partially cutaway side view of an electromagnetic device according to an embodiment of the invention, and FIG.
7 is a perspective view of a yoke and a movable iron piece, FIG. 8 is a perspective view of a movable iron piece according to another embodiment of this invention, and FIG. 9 is a line C-C of Fig. 8. It is a line enlarged sectional view. 1... Container, 2... Plunger, 3... Braking oil, 4... Compression spring, 5... Iron piece, 6... Excitation coil, 7... Yoke, 7a... Horizontal part, 7c... Vertical part , 7e...Top end, 7g...Vertical outer surface, 8
...Movable iron piece, 8b...Output piece, 9...Tension spring. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] An electromagnet having an excitation coil wound thereon and having a magnetic pole face formed at one end; and an electromagnet having one end fixed to the other end of the electromagnet and the other end extending near the magnetic pole face of the electromagnet. an L-shaped yoke, a movable iron piece rotatably supported by the other end of the yoke, and one end of which is attracted to the magnetic pole surface of the electromagnet; An output piece that activates the opening mechanism of the circuit breaker or disconnector during operation, and a spring force that is stretched between the movable iron piece and the yoke to move one end of the movable iron piece away from the magnetic pole face of the electromagnet. In an electromagnetic device equipped with a tension spring that biases the yoke, the output piece extends along the tension spring to at least a locking portion between the tension spring and the yoke, even though the output piece is wider than the outer diameter of the spring; An electromagnetic device characterized in that the tension spring is installed in an opposing space formed by the output piece and the yoke.