JPS6136061Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an earth leakage device that displays an earth leakage display by moving a display button when an earth leakage trip is performed, and automatically cancels the earth leakage display by turning the handle. This is related to the earth leakage display mechanism in disconnectors, and there is no erroneous display, and the sequence from earth leakage tripping to contact opening and display can be reliably regulated, and even if an external force is applied to the display button from the outside, the earth leakage tripping operation will not be hindered. The purpose is to obtain an electric leakage and disconnection that can be performed without any problems.

First, the current leakage and disconnection circuit according to the present invention will be explained, starting with the circuit breakage mechanism centered on the trip link for opening and closing the main circuit.

Fig. 5 is an enlarged side view of the main part, and Fig. 6 is a side view of the main part seen from the opposite side. and a plunger 22 which is attracted and driven by the magnetomotive force of the coil 21. One end of the plunger 22 faces one end of the trip link 13 pivotally supported by the frame 6 through a small gap. The other end is a movable contact 10
is engaged in. 12 is a bimetal as an overcurrent detection device, one end of which is fixed to the frame 6 and disposed above the solenoid 11, and the free end of the bimetal 12 is located below one piece of the tripping link 13 to detect temperature rise. At times, it is displaced upward and rotates the tripping link 13 against the return spring 33 for the tripping link. Reference numeral 15 designates a latch link which is pivotally supported by the frame 6 and has a locking hole 16 that engages with the locking protrusion 14 of the tripping link 13, and has a vertically elongated hole 17 provided approximately directly below the pivot point. The trip link is composed of four links 3, 4, 5, and 7, and the movable shaft 19 attached to one end of the intermediate link 4 is connected to the vertical hole 17 of the latch link 15.
It engages with a horizontally elongated hole 18 provided in the frame 6. A link shaft 2 is attached to the other end of the intermediate link 4, and one end of each of the links 7 and 3 is connected by this link shaft 2. The other end of the contactor link 3 is connected to the center of the movable contactor 10 by a contactor shaft 20,
The other end of the intermediate link 7 is a handle link 5 that rotates integrally with a handle 25 that is pivotally supported on the frame 6.
is connected to. The movable contact 10 has a movable contact 29 at the lower end and a contact shaft 20 at the center, and has a long groove 24 at its upper end that engages with a pivot shaft 23 fixed to the frame 6. Support shaft 23
The spring pressure of the contact pressure spring 30 is applied to the portion between. Further, the plunger 22 is engaged between the contact shaft 20 and the movable contact 29. In the figure, 1 is a return spring for the operating handle 25, and this return spring 1
is formed from a torsion spring, and as shown in FIG. extends upward in a straight line, and this extended portion constitutes an arm piece 1a, which is slidably and resiliently contacted with the link shaft 2. 36 is an arc travel plate extending from the frame 6, 38 is an arc extinguishing block placed in the arc extinguishing chamber 37, and the load current is transmitted through the fixed contact 39.
From movable contact 29, movable contactor 10, braided copper wire 4
0, bimetal 12, and coil 21.

1, 4, 5, and 10 show the on state, in which the trip link 13 and the latch link 15 engage to latch the movable shaft 19, and the shaft of the handle 25 is Due to the positional relationship between the fulcrum and the link shaft 2 and the connection point between both links 5 and 7, the trip link presses the movable contact 10 to the right in the figure against the contact pressure spring 30, and fixes the movable contact 29. It is brought into contact with the contact point 39. Further, the contact pressure point is maintained by the rotational moment applied from the contact pressure spring 30 around the contact shaft 20. Next, handle 25
If you tilt it to the left from the state in Figure 4, you will get Figures 6 and 11.
As shown in the figure, the intermediate link 7 is pulled up and the link shaft 2 is moved upward around the movable shaft 19, and the movable contact 10 is also moved to the left by the spring pressure of the contact pressure spring 30, causing the movable contact 29 to move upward. open. At this time, the link shaft 2 moves while slidingly contacting the arm piece 1a of the return spring 1, but the link shaft 2 moves upward without any load being applied to the arm piece 1a. In this off state, the return spring 1 applies a load in the direction of resetting the latch device. Next, when the handle 25 is tilted from the OFF state to the ON state, the movable contact 29 of the movable contact 10 is closed by an operation in the opposite direction to the above-described operation from the ON state to the OFF state. At this time, the link shaft 2 moves from the upper position to the lower position, but no load is applied to the return spring 1 in the same way as when transitioning from the on state to the off state. It will be reset. Next, when an overcurrent flows in the ON state, the bimetal 12 is displaced upward due to its own heat generation, causing the tripping link 13 to rotate. As a result, the locking protrusion 14 that was blocking the rotation of the latch link 15 comes off from the latch link 15, so the movable shaft 19 cannot be restrained against the contact pressure spring 30, and the movable shaft is moved by the spring pressure of the contact pressure spring 30. 19 is moved to the left along the horizontally long hole 18, and the link shaft 2 is moved to the left. The trip link thus unlatched is tripped by the spring pressure of the contact pressure spring 30, opening the movable contact 10. Also, if a current several times higher than the rated value, such as a short circuit current, flows, the solenoid 11 is actuated and one end of the plunger 22 first drives the trip link 13 to unlatch the latch link 15, and then the movable contact 10
be forcibly removed. After this, the trip link performs the same operation as at the time of overcurrent trip to complete the opening operation.

Next, the earth leakage display mechanism according to the present invention will be explained. This part is the zero-phase current transformer 6 when a leakage occurs.
It consists of an electromagnetic tripping device for accepting a zero detection signal as an input signal by a switching element and tripping the shearing mechanism, and a display device for displaying the tripping at that time. This tripping electromagnet 41
As shown in FIGS. 8 and 9, the magnetic path is a magnetic body consisting of a yoke 42 and a plunger 43, and a coil block 44 fitted on the yoke 42.
The plunger 43, the plunger spring 45, and the clutch piece 46, which are inserted into the air core from above and below and are caulked together, become movable parts, so that when a magnetomotive force is applied to the coil block 44, the plunger 43 is attracted upward. It's getting old. Further, an earth leakage display lever 47 is rotatably connected to the yoke 42 by a rivet 48, and similarly, a rivet 50 is attached to the yoke 42.
It is held by a leakage indicator stopper 49 having spring properties which is caulked to the yoke 42. That is, the hemispherical convex portion 51 provided on the earth leakage indicator stopper 49 is connected to the notch 52 of the earth leakage indicator lever 47.
, and prevents the earth leakage display lever 47 from rotating clockwise. In addition, the earth leakage display lever 47
The notch 53 at the other end has a connecting wire 5 coupled to the contact shaft 20 of the shriveling mechanism.
The L-shaped portion 54a at the tip of No. 4 is engaged with the L-shaped portion 54a. Furthermore, the tip 47 of the earth leakage display lever 47
A display button 55 is provided on the upper surface of a and is biased downward by a display button spring 56. In addition, 57 is a cover, 58 is a stopper for the display button 55, and 5
9 is the base.

Next, the operation will be explained. FIG. 11 shows the off state. At this time, the plunger 43 is not operating, the earth leakage display lever 47 is also held by the convex portion 51 of the earth leakage display stopper 49, and the display button 55 is in a depressed state by the display button spring 56. ing. FIG. 10 shows the on state, and when the handle 25 is turned on, the movable contact 10 moves, and as the contact 10 moves, the connecting wire 54 connected thereto is moved in the C direction. . FIG. 12 shows a state in which the plunger 43 begins to operate due to a current leakage occurring in this state. That is, when the plunger 43 is sucked in the D direction, the clutch piece 46 coupled to it kicks up the trip link 13 in the E direction, thereby releasing the latch engaging portion of the shearing mechanism, that is, the trip link 13. The engagement portion between the latch link 15 and the latch link 15 is disengaged in the F direction, and the shearing mechanism begins to lose its balance. Furthermore, the plunger 43 is sucked in the D direction, and FIG.
After the engaging portion 46a of the clutch lever 46a kicks up the tripping link 13 and releases the latch, the cutout step portion 46b of the clutch piece 46, which is the second driving portion, kicks up the tip 47a of the leakage indicator lever 47. At this time, the earth leakage indicator lever 47 was held by the convex part 51 of the earth leakage indicator stopper 49, but since the earth leakage indicator stopper 49 has spring properties, the earth leakage indicator lever 47 climbed over the convex part 51 and moved to the convex part 51.
1, and is now held at this position by the convex portion 51 in the same way. In addition, the connecting line 54
is engaged with the earth leakage indicator lever 47, but the movable contact 10 is turned off due to the latch tripping, and the G
By moving in the direction, movement of the earth leakage indicating lever 47 after being raised is not hindered. Further, when the earth leakage display lever 47 is kicked up, its tip pushes up the display button 55 in the H direction and projects it. Thereafter, the handle 25 is returned in direction I by the return spring 1 of the handle, and the latch engagement is reset as shown in J. FIG. 14 shows this state. That is,
Although the plunger 43 is also reset, the earth leakage indicator lever 47 is held by the convex portion 51 of the earth leakage indicator stopper 49, and remains raised with the indicator button 55 protruding.

Next, in a state where no leakage current is occurring again, the handle 25 is turned in the on direction, i.e., in the K direction, and the display button 5
15 shows the state in which the movable contact 10 is pushed down in the L direction and reset. That is, when the handle 25 is turned on, the movable contact 10 is turned on and the connecting wire 54 moves in the M direction in conjunction with the contact shaft 20. Since the L-shaped portion 54a at the tip of the connecting wire 54 is engaged with the notch 53 of the earth leakage display lever 47, the movement of the connecting wire 54 rotates the earth leakage display lever 47 in the N direction. At this time, the earth leakage display lever 47 also rotates in the N direction.
7 overcomes the spring force of the leakage current indicating stopper 49, overcomes the protrusion 51, and is reset to the initial position.

Through the above operations, the earth leakage is tripped and the display and display are automatically reset.
By adopting such a configuration, the handle 25
In the on state, there is no erroneous display such as the display button 55 protruding due to some impact other than electric leakage. This is because as long as the movable contactor 10 is in the on position, the position of the earth leakage indicating lever 47 is restricted by the connecting line 54, so that the lever cannot operate by itself. Furthermore, the order of earth leakage tripping, contact opening, and display button protrusion is reliably followed. Furthermore, even if the display button 55 is forcibly pressed from the outside and the earth leakage trip is performed, the tripping function of the cut-off mechanism section will not be hindered, and the device will operate safely and reliably as a trip-free mechanism.

As mentioned above, due to the presence of the connecting line, the current leakage indication will not occur unless the trip link is actually unlatched and the trip link is not tripped or disconnected. The earth leakage display is automatically canceled by resetting the trip link when the power is turned on.
In addition, the presence of the stopper ensures that the display state is maintained until a reset operation is performed, and the display in the event of electrical leakage or disconnection is reliable and does not display incorrectly, and is driven by a tripping electromagnet. In order to unlatch the trip link and drive the indicator button via the earth leakage indicator lever, the clutch piece responds to the plunger, which unlatches the trip link at the beginning of the operating stroke of the clutch piece and at the end of the operating stroke. In order to drive the display button, the connection line does not interfere with the operation of the display button when a current leakage display should be performed, and there is no possibility that an external force is applied to the display button and prevents the current leakage display operation. There are advantages such as the earth leakage tripping operation being carried out without any problem even if the

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a partially cutaway side view, Figure 2 is a top view with the cover removed, and Figure 3 is a partially cutaway side view when there is an electrical leakage or disconnection.
Figure 4 is a partially cutaway side view seen from the opposite side, Figure 5 is an enlarged side view of the main part, Figure 6 is a side view of the main part seen from the opposite side, and Figure 7 a and b are the frame and return. Enlarged exploded perspective view and enlarged sectional view showing the relationship with the spring, No. 8
The figure is an exploded perspective view of the earth leakage display mechanism, Figure 9 is a perspective view of the same assembled state, and Figures 10 to 15.
The figure is an explanatory diagram of the operation. In the figure, 10 is a movable contact, 13 is a tripping link, 41 is a tripping electromagnet, 42 is a yoke, 43 is a plunger, 44 is a coil block, 46 is a clutch piece, and 46a is an engaging part as a first drive part. , 4
Reference numeral 6b indicates a notched stepped portion as a second drive unit, 47 indicates an earth leakage indicator lever, 49 indicates a stopper, 54 indicates a connecting line, and 5
5 is a display button.

Claims (1)

[Scope of utility model registration request] A tripping electromagnet equipped with a coil block and a yoke, a plunger driven by the tripping electromagnet operated by leakage current, a clutch piece that responds to the plunger, and a clutch piece that can freely rotate over an elastic stopper. The earth leakage indicator lever is connected to the earth leakage indicator lever, which is equipped with a display button drive unit, and a movable contact driven by a trip link for opening/closing the main circuit, and the earth leakage indicator lever is connected. The clutch piece has a first drive section for driving the trip link that unlatches the trip link at the beginning of the operation stroke to perform a tripping or disconnection operation, and a connecting line for regulating rotation. and a second drive unit that drives an indicator button via the earth leakage indicator lever in the latter half of the stroke.