JPS6212619B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tripping device for an earth leakage breaker.

Conventionally, a tripping device for an earth leakage breaker has been proposed that has a link mechanism and has an operating knob that rotates back and forth. However, this device has a large number of parts, has a complicated structure, and requires complicated assembly work.

The present invention has been made in view of these drawbacks, and its purpose is to provide a trip device for an earth leakage breaker that has a simple configuration with a small number of parts, is easy to assemble, and has little variation in operation. be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in accordance with an embodiment of the present invention with reference to the accompanying drawings.

1 to 4 show an earth leakage breaker equipped with a tripping device 10 according to the present invention.

This trip device 10 is composed of an electromagnetic device 11, an operating button 15, an operating lever 20, and a coiled contact spring 25. Operation button 15
As shown in FIGS. 7 to 9, the cutout hole 1
6, a stopper 17, and arc barriers 18, 18, which are provided in the hole 2 of the case 1 so as to be movable up and down, and the upper end protrudes from the upper surface of the case 1. Furthermore, by fitting the opening edge 64a of the operation rubber 63 into the annular groove 19 formed on the upper part of the operation button 15, the inside of the case 1 is made waterproof and dustproof. It is sufficiently flexible so as not to prevent the vertical movement of the operation button 15.
It has resilience. Further, the upper part of the operation button 15 is colored in a different color from the operation rubber 63 to facilitate identification of the vertical movement position. As shown in FIGS. 10 and 11, the operating lever 20 is
A support shaft 21 is provided approximately in the center, and shaft portions 22, 22 are provided slightly on the rear end side of the support shaft 21. By loosely fitting the support shaft 21 into the notch hole 16 of the operation button 15, the support shaft can be opened. It is mounted so as to be swingable about 21 as a fulcrum. The contact spring 25 has an upper end connected to the electromagnet device 1.
1 frame 12, and the lower end is attached to the operating lever 2.
0 shaft portions 22, 22, ie, one each on both sides of the operating lever 20. Further, the rear end stepped portion 23 of the operating lever 20 can engage with the lower end of the movable iron piece 13 of the electromagnet device 11, and the tip operating portion 24 is connected to the tips of movable pieces 37a and 37b having main movable contacts 36a and 36b. It can be contacted from below.

The opening/closing mechanism 30 has a pair of main fixed contacts 31a and 31b.
and main movable contacts 36a, 36b, and the main fixed contacts 31a, 31b are fixed pieces 32a, 32b shown in FIGS.
゜Used by changing the installation angle) holes 33a, 33
The fixing pieces 32a and 32b are fixed to the case 1 with screws 35. The main movable contacts 36a, 36b are caulked into the holes 38 of the movable pieces 37a, 37b shown in FIGS. 39b and is supported in a cantilever manner.

The main circuit includes a load terminal 42a shown in FIGS. 18 to 21 in the center hole 41 of a well-known zero-phase current transformer 40,
It is constructed by inserting the bent piece 43 of 42b,
The lower ends of the bent pieces 43 are soldered to the holes 34a, 34b of the fixed pieces 32a, 32b. Also,
A printed circuit board 46 equipped with a control circuit is connected to the terminals 42 on the load terminals 42a and 42b as shown in FIG.
The 25th
As shown in the figure, the control circuit 48 includes the electromagnet device 11,
It is connected to a zero-phase current transformer 40 and load terminals 42a and 42b. Then, the control circuit 48 and the load terminal 4
Connections with 2a and 42b are made by soldering the protrusion 44 to the printed circuit. Furthermore, the protrusion 3 protruding from the ceiling of the case 1 passes through the hole 47 of the printed circuit board 46 to the load terminal 42a,
42b, and prevents external impact from directly reaching the printed circuit board 46. Further, the area around the zero-phase current transformer 40 is a printed circuit board 46 and a load terminal 4.
2a and 42b are resin molded.

As shown in FIGS. 3 and 4, the auxiliary contact 50 is
It is fixed to the tip of the auxiliary contact piece 51, located below the main movable contact 36a, and forms a normally open contact with the contact 36a. The auxiliary contact piece 51 has a rear end fixed to the case 1 in a cantilever manner, and the rear end is connected to a coil of a buzzer device 52 (consisting of an electromagnetic device) with a lead wire (not shown), and other than the coil. The end is connected to a power supply terminal 39b by a lead wire (not shown).

On the other hand, the power terminals 39a, 39b and the terminal portions 45a, 45b of the load terminals 42a, 42b are arranged on the same plane and in parallel at the lower position when the earth leakage breaker is installed, as shown in FIG. . These power terminals 39a, 39b and load terminal parts 45a, 4
5b is partitioned by a barrier 6 provided on the base 5, covered with a terminal cover 8, and has independent wiring introduction holes 9, 9 formed therein.

The test mechanism 55 is provided on the top surface of the case 1 as shown in FIGS. 1 and 3, and is composed of a test piece 56, a copper wire 58, and a resistor 59.
The rear end is fixed to the case 1 in a cantilever manner, and the bent portion 57 at the tip and the copper wire 58 constitute a normally open contact.
The resistor 59 is installed in the recess 4 formed on the top surface of the case 1, the leg 60 is soldered to the rear end of the test piece 56, and the other leg 61 passes through the case 1 and is soldered to the load terminal 42b. . The copper wire 58 passes through the case 1 and is soldered to the load terminal 42a (see FIG. 25). Moreover, this test mechanism 55 is covered with an operating rubber 63 shown in FIGS. 22 to 24, and by pressing an operating part 66 whose peripheral part 67 has flexibility and restorability,
The bent end portion 57 of the test piece 56 comes into contact with the copper wire 58 . As mentioned above, this operation rubber 63 is designed to prevent water and dust from entering the case 1 from the operation button 15, as well as from the test mechanism 55, and has a protrusion 6 formed on the bottom surface.
8, the end 58a of the copper wire 58 is pressed to prevent the end 58a from lifting up. Further, the operating rubber 63 is held by a nameplate 70 attached to the top surface of the case 1, and parts 69a and 69b of the operating rubber 63 are attached to the test piece 5.
6. The resistor 59 and the nameplate 70 are insulated.
Necessary displays are made on the nameplate 70, and portions corresponding to the operation buttons 15 and the test operation section 66 are opened.

Next, the operation of the earth leakage breaker having the above configuration will be explained.

First, as shown in FIG. 5, in the tripping device 10, when the operation button 15 is in the upward movement position, the operation lever 20 is a locking portion of the contact spring 25 with respect to the support shaft 21, which is a swing fulcrum. Since the shaft portion 22 is slightly displaced toward the rear end, it is biased counterclockwise by the spring force of the contact spring 25, and the tip operation portion 24
is in contact with the floor surface 5a of the base 5 to determine the swing angle. At this time, the main movable contacts 36a,
36b is separated from the main fixed contacts 31a and 31b,
The main movable contact 36a closes the auxiliary contact 50.

Now, when the operation button 15 is pressed down, the operation lever 20 moves downward and the tip operation section 24 moves to the floor surface 5a.
The rear end step portion 23 engages with the lower end of the movable iron piece 13 of the electromagnet device 11 (see FIG. 6). Furthermore, operation button 15
When the pressing force is released, the operating lever 20 swings clockwise due to the spring force of the contact spring 25 and moves slightly upward because the rear end step 23 is engaged with the lower end of the movable iron piece 13. However, the tip operation section 24 is connected to the movable piece 3.
Push up the tips of 7a and 37b to release the main movable contact 36.
a is separated from the auxiliary contact 50, and the main movable contact 36a,
36b closes the main fixed contacts 31a and 31b (see FIG. 3). At this time, the operating lever 20 is kept in a substantially horizontal state with the front and rear abutting against the movable pieces 37a, 37b and the movable iron piece 13, and the operating button 15 is held at the sixth position.
It has returned to a slightly higher position than the pushed-in position shown in the figure.

This earth leakage breaker is used in this state, and the 25th
The current from the power supply circuit 71 shown in the figure is supplied to the power supply terminal 3.
9a, 39b, movable pieces 37a, 37b, contact 36
a, 36b, 31a, 31b, fixed piece 32a, 3
2b, and is supplied to the load circuit 72 via load terminals 42a and 42b.

A leakage occurs in the load circuit 72 and the load terminal 42
Abnormal current occurs in a, 42b, zero phase current transformer 40
When the movable iron piece 13 operates, the detection signal is input from the control circuit 48 to the electromagnet device 11, and the movable iron piece 13
It rotates counterclockwise in the figure to release the engagement with the rear end step portion 23 of the operating lever 20. By this release, the operating lever 20 swings counterclockwise and moves upward together with the operating button 15 (see FIG. 5), and the tip operating section 24 releases the push-up against the movable piece 37, and the main movable contact 36a, 36b is separated from the main fixed contacts 31a and 31b, and the main movable contact 36
a closes the auxiliary contact 50. That is, the current to the load circuit 72 is cut off, and the buzzer device 52 is energized to generate an alarm sound.

Furthermore, even if the operation button 15 is pressed in the position shown in FIG. 3 and fixed so that it does not move upward, if an abnormal current flows through the load terminals 42a and 42b, the electromagnet device 11 will switch to zero phase as described above. Operated by the detection signal from the current transformer 40, the operating lever 20
is disengaged from the movable iron piece 13 and swings counterclockwise, and the main movable contacts 36a, 3
6b opens the main fixed contacts 31a and 31b, cutting off the current to the load circuit 72 (free to trip).

On the other hand, when the test mechanism 55 presses the operating part 66 of the operating rubber 63, the tip bent part 57 of the test piece 56 contacts the copper wire 58, and current flows to the load terminals 42a and 42b via the resistor 59. Load circuit 72
This causes the same situation as when an electric leak occurs.

In addition, the main contacts 31a, 31b, 36a, 3
6b may have a two-pole contact configuration for single-phase applications, but for three-phase applications, it is necessary to have three-pole contact configurations arranged in parallel.

As is clear from the above explanation, the present invention consists of a small number of parts such as an electromagnetic device, an operating button, an operating lever, and a contact spring, and of course has fewer parts than a conventional tripping device with a link mechanism. The structure is simple and assembly work is easy. Moreover, since the contact spring is locked slightly to the rear end side of the shaft support of the operating lever, and a rocking force is applied to the operating lever in the direction of engagement with the movable iron piece of the electromagnet device, one contact spring can be used to control the operating button. The return force, swinging force of the operating lever, and contact pressure can be obtained, which greatly contributes to reducing the number of parts and simplifying the configuration.

In addition, since the movable piece is cantilever-supported by the case, the wiring (lead wire) to the movable piece can be done independently of the operating lever, so it does not interfere with the operation of the operating lever, and contact pressure can be easily managed. be. Furthermore, since the operation button and the contact spring are attached to the support shaft and the shaft portion of the operation lever, respectively, the three are accurately positioned and variations in operation are reduced.

[Brief explanation of the drawing]

The drawings show an earth leakage breaker equipped with a tripping device according to the present invention and its parts, FIG. 1 is a plan view with the operating rubber removed, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 1 is a sectional view taken along line 1, FIG. 4 is a bottom view with the base removed, and FIGS. 5 and 6 are explanatory views of the operation of the tripping device. FIG. 7, FIG. 8, and FIG. 9 are a front view, a side view, and a plan view of the operation button. Fig. 10 is a plan view of the operating lever, Fig. 11 is a front view thereof, and Fig. 12 is a plan view of the operating lever.
FIG. 13 is a sectional view taken along the line ---, --- of FIG. 10. Figure 14 is a plan view of the fixing piece, with the first
5 is a side view thereof, FIG. 16 is a plan view of the movable piece, and FIG. 17 is a front view thereof. Figures 18 and 20 are front views of the load terminals, and Figures 19 and 21 are front views of the load terminals.
The figure is its bottom view. Fig. 22 is a plan view of the operating rubber, Fig. 23 is a cross-sectional view taken along the - line, and Fig. 24
The figure is a bottom view of FIG. 22. FIG. 25 is a circuit diagram. 10...Tripping device, 11...Electromagnetic device, 1
3... Movable iron piece, 15... Operating button, 20... Operating lever, 21... Support shaft, 22... Shaft part, 23... Rear end step part, 24... Tip operating part, 25... Contact spring, 30...
Contact mechanism, 31a, 31b, 36a, 36b...main contact, 37a, 37b...movable piece, 40...zero phase current transformer.

Claims (1)

[Claims] 1. An electromagnetic device that operates based on a detection signal from a zero-phase current transformer, an operation button that is movable up and down, and an operation that is swingably supported by a support shaft provided approximately in the center of the operation button. Consists of a lever and a contact spring that urges the operating lever and operating button upward by locking one end to a shaft portion provided slightly rearward of the supporting shaft of the operating lever, and presses the operating button downward. When the electromagnet device is in a non-operating state, the rear end of the operating lever engages the movable iron piece of the electromagnet device and pushes up the movable piece of the opening/closing mechanism whose tip is cantilevered on the case to close the main contact. A tripping device for an earth leakage breaker, characterized in that: