JPS596459B2 - Overcurrent protection relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overcurrent protection relay, and its purpose is to enable a large contact opening distance, and to prevent overcurrent interruption after the contact is interrupted. To provide an overcurrent protection relay in which a closed state of a contact is not restored unless a display chain is completely returned to its original state.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Reference numeral 1 denotes an electromagnetic overcurrent element, which is composed of an electromagnetic coil 8, an oil dashpot 9, and a yoke 10. When an overcurrent flows through the electromagnetic coil 8 inserted into the load circuit, the oil dashpot 9 is activated. It will operate and attract the armature 2.

The armature 2 is supported by a shaft 13 on a bearing 12 of a frame 11 formed integrally with the yoke 10, and a detachment plate 3, which is biased in the clockwise direction in the figure, is also supported on this shaft 13. ing.

When the lower end of the armature 2 is absorbed by the oil dashpot 9 when an overcurrent occurs, the operating section 14 at the upper end of the armature 2 rotates the tripping plate 3 counterclockwise against the biasing spring force. The movable contact 6 is driven to release the latch engagement between the tripping plate 3 and the rear end of the movable contact 6.

The movable contactor 6 has a contact point 4 at its tip and a latch engagement portion with the pull-out plate 3 at its rear end. The movable contact 6 is supported by a shaft pin 17 which is vertically slidably supported by a shaft pin 17 so as to be movable up and down and seesaw, and furthermore, the movable contact 6 is supported by a compression coil spring at a portion between the shaft support and the latch engaging portion. The lower end of the spring 5 is supported by the upper surface of the yoke 10.

7 is a chain body whose upper part protrudes upward from the upper surface of the housing 18, and this chain body r is biased in the downward retraction direction by a weak coil spring 19, and by the spring 5 of the movable contact 6. The lower end of the chain body 7 is always in contact with the upper surface between the upward biasing part and the shaft support part by the shaft pin 17.The amount of upward protrusion of the chain body 7 is linked to the operating state of the movable contact 6. be.

In the figure, 22 is the lower casing, 23° and 24 are terminal boards, 25.
26 are terminal screws, respectively.

1 shows a normal circuit-on state, in which the rear end of the movable contact 6 is latched and supported by the engagement hole 20 of the removal plate 3, and the spring 5 Since the contact 4 is strongly urged upward, a force in the upward movement direction acts on the tip of the movable contact 6 on the side where the contact 4 is attached, so that the contact 4 comes into pressure contact with the fixed contact 21 and the above-mentioned Spring 5
The contact pressure is given by

At this time, the movable contact 6 is inserted into the engagement hole 20 of the removal plate 3.
Since the position is determined by the contact part of the contact 4 with respect to the fixed contact 21 and the poem is composed, the contact part of the chain I with the movable contact 6 is located below, and the chain 1 is retracted downward. , normal state V is displayed.

Next, when the load current flowing from the terminal plate 23 through the path of the electromagnetic coil 8, the lead wire 27, the movable contact 6, the contact 4, the fixed contact 21, and the terminal plate 24 becomes an overcurrent, the electromagnetic coil 8 is configured. The overcurrent element 1 responds and attracts the lower end of the armature 2, causing the armature 2 to rotate counterclockwise in the figure.

Therefore, the operating portion 14 at the upper end of the armature 2 rotates the tripping plate 3 counterclockwise against the spring bias, and this rotation of the tripping plate 30 causes the engagement hole 20 to
The rear end of the movable contactor 6 is disengaged from the rear end of the movable contactor 6, and the movable contactor 6 rapidly rotates clockwise around the shaft pin 7 supported at the upper end of the vertical hole 16 by the spring force of the spring 5. As shown in the figure, the contact between the contact 4 and the fixed contact 21 is released to break the circuit, and the chain body 7 is pushed upward by the rear upper surface of the movable contact 6 pushed up by the spring force of the spring 5. The chain body 7 largely protrudes from the upper surface of the upper housing 18 to indicate the blocked state.

When re-inserting the contact 4 after this, the chain body γ is pushed down with a finger or the like, and as a result, a downward force acting against the upward force of the spring 5 is first applied to the movable contact 6, and the shaft pin 17 slides downward within the length L16, the entire movable contactor 6 first moves downward.

Next, when the shaft pin 1γ reaches the lower end of the vertical hole 16, the shaft pin 17
is supported at the lower end of the vertically elongated hole 16, and the movable contact 6 starts to rotate counterclockwise in the figure with the shaft pin 17 as the shaft.

Therefore, the rear end of the movable contactor 6 is latched into engagement with the engagement hole 20 of the tripping plate 3 after once pushing the tripping plate 3 backward.

In this state, when the downward pressure on the chain body 7 is released, the movable contact 6 rotates counterclockwise around the latch engagement portion between the rear end of the movable contact 6 and the tripping plate 3. The state shown in FIG. 1 is restored, and the contact 4 and the fixed contact 21 are closed.

The present invention is constructed in a diagonal manner, and includes an electromagnetic overcurrent element, a tripping plate actuated by an armature that responds to the overcurrent element, and one end latched to the tripping plate. , a movable contact having a contact point at the other end, and one end of the movable contact that is normally latched engaged as a fulcrum,
The movable contact is urged in the direction in which the contact contacts the fixed contact,
When the latch is disengaged in the event of an overcurrent, the spring biases the movable contact in the direction in which the contact moves away from the fixed contact, and in conjunction with the opening operation of the movable contact, an operation display is performed and the spring is movable when operated. Since it has a contact and a chain body that recloses, once the contact & m is released, the chain body that indicates the overcurrent cutoff state is completely returned to its original state and latched using one end of the movable contact as a fulcrum. Unless engaged, the force that biases the contact to the closed state does not work, so even if the chain body is touched accidentally, the contact will not be closed, and has the advantage of excellent overcurrent protection function. ,
Also, can the contacts be opened by moving the fulcrum of the movable contact like this? Since this is done, is the contact opening distance independent of the spring's operating stroke? It has the advantage of being large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention when the circuit is closed, FIG. 2 is a sectional view of the main part of the same when the circuit is broken, and FIG. 3 is an enlarged exploded perspective view of the mechanism part of the above. 1 is an overcurrent element, 2 is an armature, 3 is a tripping plate, 4 is a contact, 5 is a spring, 6 is a movable contact, and 7 is a chain body.

Claims (1)

[Claims] 1. An electromagnetic overcurrent element, a tripping plate operated by an armature that responds to the overcurrent element, and a movable contact having one end latched to the tripping plate and having a contact at the other end. Normally, one end of the movable contact that is latched is used as a fulcrum to urge the movable contact in the direction in which the contact comes into contact with the fixed contact, and in the event of an overcurrent, the latch is released and the contact is fixed. A spring that biases the movable contact in the direction away from the contact, and an operation display that is linked to the opening operation of this movable contact? A chain body that recloses the movable contact by being operated at the same time? An overcurrent protection relay characterized by comprising: