JPS63252334A - Relay tripping apparatus for circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a relay tripping device for a circuit breaker, and more specifically, when an overcurrent detection coil detects an overcurrent, This invention relates to something suitable for smoothly operating an armature that performs a suction operation.

[Conventional technology]

In the conventional circuit breaker, as shown in Fig. 19,
An overcurrent detector 1, a retaining plate 2 attached to the overcurrent detector 1, an armature 3 rotatably held by the retaining plate 2, and an armature mounted between the armature 3 and the retaining plate 2. and a return spring 4, constituting a relay tripping device.

When the main contact 5 is closed and the detector 1 detects an overcurrent, one end of the armature 3 is rotated against the spring force of the return spring 4 and attracted to the detector 1.
When the other end hits the interlocking shaft 61 of the relay mechanism 6 and the relay mechanism 6 is tripped, the movable contact part 51 of the main contact 5 rotates in the clockwise direction Z around the mounting pin 51a. It is designed to trip like this.

The retaining plate 2. Armature 3. Return spring 4 is main contact 5
The return spring 4 is disposed at a position facing the tripping direction 2 of the movable contact portion 51, and in particular, the return spring 4 is open in the tripping direction Z.

Incidentally, related devices of this type include, for example, Japanese Patent Application No. 58-39211 and Japanese Patent Application No. 59-264648.

[Problem that the invention seeks to solve]

By the way, in the prior art shown in FIG. 19, since the return spring 4 is opened in the tripping direction Z of the main contact 5, when the main contact 5 is tripped due to detection of an overcurrent, the main contact 5 is The molten material scatters from the contact part along the trip operation direction Z and adheres to the return spring 4, causing melting and deformation of the return spring 4. Therefore, even if the armature 3 is reset, the armature 3 will not function properly during subsequent trip operations. I have a problem with it not working.

In addition, in order to solve the above problem, it is easy to consider covering the return spring 4 with a tube 4a as shown in FIG. 20, but in that case, even the tube 4a has some rigidity. However, there is a problem that the function of the return spring 4 is impaired due to the rigidity of the tube 4a, and there is also a problem that the number of parts increases accordingly.

In view of the problems of the prior art, an object of the present invention is to prevent the scattered melt from the main contact from adhering to the return spring,
An object of the present invention is to provide a relay tripping device for a circuit breaker that can maintain smooth tripping operation of an armature.

[Means for solving problems]

In the present invention, the holding plate has a shielding wall that can shield the return spring from the main contact.

[Effect]

When the overcurrent detector detects an overcurrent, the armature rotates and is attracted to the detector, and the rotation of the armature contacts the relay mechanism, causing the relay mechanism to trip and open the main contact. .

At that time, the main contact trips clockwise, and the molten material from the main contact is scattered in the direction of the tripping action, so there is a risk that the molten material may adhere to the return spring located at a position facing the tripping direction. .

However, since the holding plate has a shielding wall that can shield the return spring from the tripping direction of the main contact, the shielding wall can reliably prevent the scattered melt from adhering to the return spring. That is, since the scattered molten material adheres to the shielding wall, the molten material does not adhere to the return spring.

As a result, the return spring does not have any scattered molten matter attached to it, so that the return spring can function normally without being fused or deformed due to the attachment of the molten matter.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 18. Fig. 1 is a perspective view of essential parts showing the first embodiment of the present invention, Fig. 2 is an explanatory plan view showing the relationship between the holding plate and the relay mechanism, and Fig. 3 is a sectional view of the overcurrent detector. , FIG. 4 to FIG. 6 are perspective views showing respective modifications of the holding plate.

The circuit breaker relay tripping device of the embodiment includes an overcurrent detector (hereinafter abbreviated as a detector) 1, a retaining plate attached to the detector and disposed at a position facing the main contact 5. , rotatably held by the holding plate, and the detector 1
The detector 1 includes an armature 3 that is attracted to the detector 1 when the detector 1 detects an overcurrent, and a return spring 4 that is mounted between the armature 3 and the holding plate 2.

Specifically, as shown in FIG.
is a coil 11 and a cylinder 1 through which the coil 11 is inserted.
2, a head 13 that closes off the upper part of the cylinder 12, a plunger 14 built into the cylinder 12, and an oil 15. When an overcurrent flows, the coil 11 attracts the plunger 14 in the cylinder 12 against the spring force of the coil spring 16, and the plunger 14
is moved in the direction of the head 13.

' The holding plate 2 is in contact with the coil 11 and the cylinder 12
When the detector 1 detects an overcurrent, the coil 11. It is composed of a magnetic plate such as a yoke so as to form a magnetic circuit together with the plunger 14.

The armature 3 has a suction plate 31 provided at one end extending to the head 13, and grooves that engage with support portions 21 provided on both sides of the other end and formed on both sides of the upper part of the holding plate 2. and a posture control plate 33, 33' extending downward between the arm 32 at the other end,
Both arms 32 are rotatably supported by engaging with the support portion 21 of the holding plate 2.

The return spring 4 has one end hooked to a hook portion 34 provided at the center of the other end of the armature 3, and the other end hooked to a lower portion of the holding plate 2.

When an overcurrent flows through the coil 11 of the detector 1, the coil 11 attracts the plunger 14 in the cylinder 12, and the attraction force causes the plunger 14 to move into the cylinder 1.
2 to the upper end and hold the cylinder 12° holding plate 2. By forming a magnetic circuit between the armatures 3, the attracted plate 31 of the armature 3 is attracted to the cylinder 12 against the spring force of the return spring 4, thus detecting an overcurrent.

Note that the main contact 5 is a movable contact part 5 that is rotatably installed.
1 and a fixing part 52. (See Figure 19).

This embodiment is different from the conventional example in that the holding plate 2 has a shielding wall 23 that can shield the return spring 4 from the main contact 5.

That is, as shown in FIGS. 1 and 2, the shielding wall 23 is returned to the center of the holding plate 2, and the side plate 23a, which has approximately the same height as the length of the spring 4, faces toward the interlocking shaft 61 of the link mechanism. The shield plate 23 is bent at right angles to the side plate 22a to cover the spring 4 and then returned to the tip of the side plate 23a.
b is extended, and the return spring 4 is shielded from the main contact 5 by the shielding plate 23b.

In that case, in order to increase the strength, the shielding wall 23 is formed by cutting out the center part of the holding plate 2, as shown in FIG.
The strength may be increased by straddling both sides of the holding plate 2.

In addition, in this embodiment of the holding plate 2, the supporting parts 21 formed on both sides of the upper part are simply in the form of a straight flat plate, but as shown in FIGS. 5 and 6, both arms 32 of the armature 3 It is also possible to use surrounding support parts 21' and 21' that can surround the support parts 21' and 21'.

In the embodiments described above, the shielding plate 23 is bent so that the holding plate 2
Although it is formed integrally with the holding plate 2, the present invention is not limited thereto, and the holding plate 2 may be formed as a separate part and fixed to the retaining plate 2 by welding, caulking, or the like.

Since the circuit breaker relay tripping mechanism of the embodiment is constructed as described above, its operation will be described below.

When the detector 1 detects an overcurrent, the head 1 of the detector 1
2, the attracted plate 31 of the armature 3 rotates and is attracted, and the rotation of the armature 3 causes the interlocking shaft 6 of the relay mechanism 6 to
1 is bruised and the relay mechanism 6 is tripped, causing the main contact 5 to open (see FIG. 19).

At that time, the movable contact portion 51 of the main contact 5 trips clockwise, and the molten material from the main contact 5 is scattered in the tripping direction 2, so the return spring 4 provided at a position facing the main contact 5 There is a risk that molten matter may adhere to the

However, since the holding plate 2 is formed with a shielding wall 23 that can shield the return spring 4 from the main contact 5, the shielding wall 23
3, it is possible to reliably prevent the scattered melt from adhering to the return spring 4. That is, the scattered molten material adheres to the shielding wall 23, and the return spring 4 does not receive molten material.

As a result, the return spring 4 does not have any scattered molten matter attached to it, so that the return spring 4 can function normally without being fused or deformed due to the attachment of the molten matter.

Further, since the shielding wall 23 is formed by bending the retaining plate 2 and there is no need to use the tube 8 as in the conventional example, the number of parts does not increase.

Furthermore, as shown in FIG. 2, the shielding wall 23 protrudes from the main body of the holding plate 2 to the side of the interlocking shaft 51 of the relay mechanism 5;
Since its protrusion can be made to the same degree as the armature 3, a narrow space such as a small circuit breaker can be effectively utilized.

Furthermore, in FIGS. 5 and 6, since the surrounding support plate parts 21' and 21" are formed on the holding plate 2, the rotation fulcrum part of the armature 3 is supported by the surrounding support parts 21' and 21". As a result, the operation of the armature 3 is not adversely affected.

7 to 9 show a second embodiment of the invention.

In this embodiment, the operation of the detector 1 is stabilized in order to prevent the detector 1 from malfunctioning due to the inrush current value of a motor or the like.

That is, in this embodiment, the coil 1 is arranged so that the dimension between the head 13 of the detector 1 and the coil 11 can be made as large as possible.
1 is placed downward. On the other hand, a cylindrical portion 24 for cylinder insertion extending upward is formed in the holding plate 2 at a portion through which the cylinder 12 of the detector 1 is inserted, and upon detection of an overcurrent, the plunge + 14 is moved to the head 13 by the attraction force of the coil 11. When the bottom of the plunger 14 is on the retaining plate 2
It is arranged so that it is positioned above the bottom plate 22 at a certain distance B.

Therefore, the position of the bottom plate 22 of the holding plate 2 is lowered.

In this way, by lowering the position of the coil 11 of the detector 1 and by forming the cylindrical portion 24 for inserting the cylinder in the holding plate 2, when an overcurrent is detected, the attraction force of the coil 11 to the plunger 14 is reduced to the cylindrical portion 24. The instantaneous trip current value can be increased because the distance between the coil 11 and the head 13 is made as large as possible. As a result, coil 1
Coil 1 relative to plunger 14 due to misalignment of coil 1, etc.
It is possible to prevent the attraction characteristics of No. 1 from changing, obtain stable attraction characteristics, and increase the instantaneous trip current value, so even in cases where the rush current value is large, such as in a motor, It is possible to eliminate the possibility that the armature 3 will be sucked in due to a malfunction of the detector 1, and the operation of the detector 1 can be stabilized.

Incidentally, FIG. 9 shows the ratio (%) of the current drawn by the armature 3 to the rated current. From this figure, coil 1
When compared with the conventional example in which the dimension F is smaller than that of the embodiment, it is clear that the proportion of current attracted by the armature can be increased.

10 to 14 show a third embodiment of the present invention.

In this case, without changing the configuration of the detector 1, by adding a special mechanism to the armature 3 that is attracted by it, the attraction operation of the armature 3 can be adjusted, and the inrush current value of the motor etc. can be adjusted. I am trying to prevent it from malfunctioning.

That is, in this embodiment, the circuit breaker casing 7A,
7B is provided with an adjustment knob 8 for adjusting the power from the outside. The adjustment knob 8 is attached by fitting into a groove 71 provided in the casings 7a + 7b, and an adjustment groove 81 is provided on the top surface of the adjustment knob 8 so that it can be rotated with a tool such as a screwdriver from the outside of the casings 7A, 7B. It is being

Further, the adjustment knob 8 is provided with a magnetic piece 82 arranged near the attracted plate 31 of the armature 3 inside the casings 7A, 7B.

The magnetic piece 82 is a plate provided on the adjustment knob 8 via a connecting part 85, and has a bending claw 83 formed at one end facing toward the armature 3, and a bent claw 83 formed at the other end. It has an extension claw 84 that extends to a position near the holding plate 2.

Then, the adjustment knob 8 is rotated from the outside of the casings 7A, 7B to adjust the distance between the bending claw 83 of the magnetic piece 82 of the adjustment knob 8 and the armature 3, and the distance between the extension claw 84 and the holding plate 2. When overcurrent is detected, the detectors 1 and 1 are adjusted appropriately. Holding plate 2. Due to leakage of magnetic flux in the magnetic circuit formed between the armatures 3 in accordance with the distance, the armature 3 is connected to the head 13 of the detector 1.
The suction power is reduced.

Therefore, according to this embodiment, the attraction force to the armature 3 can be changed by the adjustment knob 8, so that the armature 3 is adjusted to the dotted line Y' with respect to the inrush current X of the motor, etc., as shown in FIG. If the armature 3 malfunctions at the position shown in , the armature 3 can be adjusted to prevent the malfunction as shown by the solid line Y in response to the inrush current X. In addition, since the magnetic piece 82 of the adjustment knob 8 and the armature 3 are not in contact with each other,
It is possible to prevent the magnetic piece 82 from being worn out or damaged.

15 to 17 show a fourth embodiment of the present invention.

In this embodiment, the third embodiment has the adjustment knob 8.
The distance between the adjustment knob 8 and the armature 3 can be adjusted by moving in a straight line, whereas the distance between the adjustment knob 8 and the armature 3 can be adjusted by rotating the adjustment knob 8 and its magnetic piece 82. As shown in FIG. 17, the shape is such that the distance to the armature 3 can be changed when moving in a straight line, but it is basically the same as the third embodiment.

FIG. 18 shows still another embodiment of the present invention.

In this embodiment, the bending claw 83' of the magnetic piece 82 in the adjustment knob 8 is arranged near the holding plate 2, and by moving the adjustment knob 8 in the direction of the arrow, the bending claw 83' of the magnetic piece 82
and the holding plate 2 can be adjusted, and basically the distance between the third. The same effects as in the fourth embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, since the holding plate has a shielding wall that can shield the return spring from the main contact,
Since the shielding wall can reliably prevent the scattered melt from adhering to the return spring, it is possible to maintain a smooth tripping operation of the armature.

[Brief explanation of drawings]

Fig. 1 is a perspective view of essential parts showing the first embodiment of the present invention, Fig. 2 is an explanatory plan view showing the relationship between the holding plate and the relay mechanism, and Fig. 3 is a sectional view of the overcurrent detector. , FIG. 4 is a perspective view of a modified example of the retaining plate, FIGS. 5 and 6 are perspective views showing still other modified examples of the retaining plate, and FIG. 7 is a perspective view showing a second embodiment of the present invention. FIG. 8 is an explanatory cross-sectional view of the current detector, FIG. 8 is a perspective view of the holding plate, FIG. 9 is an explanatory diagram showing the ratio of the armature's suction current to the rated current, and FIG. 10 is a third embodiment of the present invention. A plan view of the circuit breaker, FIG. 11 is a side view of the main part broken away, FIGS. 12(a) and (b) are perspective views of the adjustment knob and the area around it, and FIG. 13 is a side view of the main part broken. FIG. 14 is an exploded perspective view of the casing, FIG. 14 is a diagram of the operating characteristics of the armature, FIG. 15 is a plan view of the main parts of a circuit breaker showing the fourth embodiment of the present invention, and FIG. 16 is a cross-sectional side view of the main parts. 17(a) and (b) are a plan view and a side view showing the adjustment knob, and FIGS. 18(a) and (b) are a front view and a main part showing still another embodiment of the present invention. cross-sectional side view,
FIG. 19 is a perspective view of a circuit breaker equipped with a conventional relay tripping device, and FIG. 20 is a perspective view of a conventional relay tripping device. l... Overcurrent detector, 2... Holding plate, 23... Shielding wall, 3... Armature, 4... Return spring, 5...
...Main contact. Agent Patent Attorney Tadashi Akiki Fig. 1 1--41t, Detector 2-Yukiyuki Hashi 3-111 Armade λA 4---J+Rne Fig. 3 S1--- Itsuden Roku no Fumibanjima 2-・- Sonmachi Kei 5th figure 2-・-! 7L special plate No. 6 Figure 3...Complete-
Figure 7 Figure 9 Figure 4 8 10.5 14 East p-ri Figure 10 +2 rIA (a) (b) Figure 13 Oniku Figure 15 Figure 17 (a) Figure 18 (a) (b) Figure 20

Claims (1)

[Claims] 1. An overcurrent detector provided inside a circuit breaker equipped with a main contact for opening and closing an electric circuit and detecting overcurrent in the electric circuit, and an overcurrent detector attached to the overcurrent detector at a position facing the main contact. A holding plate arranged, an armature rotatably held by the holding plate and attracted by the overcurrent detector when the overcurrent detector detects an overcurrent, and a space between the armature and the holding plate. A circuit breaker relay tripping device having a return spring mounted on the circuit, wherein the holding plate has a shielding wall capable of shielding the return spring from the main contact. Circuit breaker relay tripping device.