JP3489307B2 - Control device of movable plate for earth leakage test in earth leakage breaker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for restricting a movable plate for an earth leakage test, for testing and confirming that an electric circuit is surely operated by an earth leakage accident on a load side of the earth leakage breaker. .

[0002]

2. Description of the Related Art FIG. 11 shows an internal electric circuit diagram of a current-operated type earth leakage breaker. The current-operated type earth leakage breaker includes a differential current transformer a between a power source s and a load f. When a ground fault occurs and a difference occurs in the current of each line, a voltage is generated on the secondary side of the differential current transformer a, and a ground fault detector connected between the lines on the load f side. This is detected by b, and the detected current flows in the trip coil c, whereby the electric circuit k of the main circuit between the power source side s and the load f is cut off to prevent a leakage accident. It is a thing. The earth leakage test button t is connected in series to a resistor r whose one end is connected to the power supply s side and is connected to one end of the ground fault detector b.

A front view of the internal mechanism of the earth leakage breaker is shown in FIG. A housing 1 (see FIG. 2) including a body 2 in which an internal mechanism of an earth leakage breaker is laterally fitted and a cover 3 that closes an opening of the body 2 is configured, and a button t for an earth leakage test is provided from the housing 1. The portion is projected and is held in a state of being sandwiched between the body 2 and the cover 3, and the base end side (fixed end side) of the leakage test button t is located inside the body 2. At the same time, the tip side (free end) is held in a state of protruding from the opening B of the body 2.

By pressing the earth leakage test button t, the earth leakage test movable plate 4 comes into contact with the fixed contact 5 for the earth leakage test circuit in the housing 1.
A pseudo leak current is passed through the trip coil c to test and confirm whether or not the electric circuit k of the main circuit is surely cut off. In the above-described earth leakage breaker, the free end x of the earth leakage test movable plate 4 is left to the bending amount of the earth leakage test movable plate 4 by pressing the earth leakage test button t.
Is held in contact with the opening edge of the body 2,
After the internal mechanism is housed in the housing 1, the button t for the leakage test is attached, and the body 2 is covered with the cover 3
Conventionally, as shown in the schematic sectional view of FIG. 10, the free end x of the earth leakage test movable plate 4 is attached to the cover 3 (see FIG. 9).
There is a possibility that the movable board 4 for earth leakage test may be broken due to this. Note that FIG. 10 shows a schematic cross-sectional view in a state where the cover 3 is removed in FIG. 9.

[0005]

In the above-mentioned conventional earth leakage breaker, the free end x of the earth leakage test movable plate 4 is caught on the cover 3 when the body 2 is covered with the cover 3. As a result, the free end x of the leakage test movable plate 4 may be broken. In addition, mounting the button t for the leakage test after housing the internal mechanism in the housing 1 has a problem that it is difficult to attach the cover 3 to the housing 1.

In view of such a problem, the regulating device for the movable plate for the leakage test in the leakage breaker according to the present invention includes the invention of claim 1, the invention of claim 2, and the invention of claim 3, respectively. After installing the internal mechanism of the earth leakage breaker in the housing, when installing the button for earth leakage test,
The purpose of the present invention is to prevent the movable plate for earth leakage test from being broken and to easily and surely attach the cover to the housing. Particularly, in the inventions of claim 2 and 3, the earth leakage test movable plate is further movable. The amount of flexure of the plate is reduced, the purpose is to prevent breakage of the movable plate for earth leakage test, and the invention according to claim 3 is for the purpose of facilitating storage of the printed circuit board in the housing. There is.

[0007]

In order to achieve the above-mentioned object, a device for restricting a movable plate for an earth leakage test in an earth leakage breaker according to the present invention is characterized in that, in the invention of claim 1, the internal mechanism of the earth leakage breaker is laterally fitted. A housing that consists of a body and a cover that closes the opening of the body is configured, and the leakage test button is partly projected from the housing and is held while being sandwiched between the body and the cover. , The base side of the leakage test button is located inside the body, and the tip side is held protruding from the opening of the body. The movable board for earth leakage test attached to the board contacts the fixed contact for the earth leakage test circuit mounted on the printed board to send a pseudo-leakage current to the trip coil, In the earth leakage breaker, which tests and confirms whether or not the road is reliably cut off, a protrusion with a straight surface is provided on the inner wall of the housing body, and the leakage is left to the flexure of the earth leakage test movable plate. The vicinity of the free end of the test movable plate is supported on the upper corner of the straight surface of the protrusion, and the protrusion is retained even when the cover is attached to the body.
The upper corner of the straight surface regulates the position of the movable plate for earth leakage testing.
It is characterized by doing.

According to the second aspect of the present invention, the housing includes a body in which the internal mechanism of the earth leakage breaker is laterally fitted and a cover that closes the opening of the body, and the button for the earth leakage test is part of the housing. Along with
It is held in a state of being sandwiched between the body and the cover, and the base end side of the leakage test button is located inside the body and the tip end side is held protruding from the body opening. When the earth leakage test button is pressed, the earth leakage test movable plate attached to the printed circuit board comes into contact with the fixed contact for the earth leakage test circuit mounted on the printed circuit board, resulting in pseudo leakage to the trip coil. In the earth leakage circuit breaker, in which a current is passed to test whether the electric circuit is reliably cut off or not, a protrusion having an inclined surface is provided on the inner wall of the housing body, and the earth leakage test movable plate is It is installed along the slope of the protrusion evenly from its base end , and the cover is attached to the body.
Even in the state where the
The feature is that the position is regulated .

According to the third aspect of the present invention, a housing including a body in which the internal mechanism of the earth leakage breaker is laterally fitted and a cover that closes the opening of the body is formed, and the earth leakage test button is partly formed from the housing. Along with
It is held in a state of being sandwiched between the body and cover, and the base end side of the leakage test button is located inside the body and the tip end side is held protruding from the opening of the body. When the earth leakage test button is pressed, the earth leakage test movable plate attached to the printed circuit board comes into contact with the fixed contact for the earth leakage test circuit mounted on the printed circuit board, resulting in pseudo leakage to the trip coil. Apply a current to test whether or not the circuit is surely interrupted, and confirm it.In an earth leakage breaker, a pin is provided on the side opposite to the fixed contact with the movable board for earth leakage test of the printed circuit board sandwiched between them. The free end of the earth leakage test movable plate is supported by the pin depending on the bending amount of the test movable plate, and the pin is supported even when the cover is attached to the body.
Is characterized in that the position of the movable plate for the leakage test is regulated .

The device for restricting the movable plate for earth leakage test in the earth leakage circuit breaker according to the present invention is constructed as described above. In the invention of claim 1, the projection having the straight surface on the inner wall of the body of the housing. The upper corner of the straight surface of the projection is supported near the free end of the leakage test movable plate, so that the upper corner of the straight surface of the projection when the cover is attached to the body. The position of the earth leakage test movable plate is regulated, the free end of the earth leakage test movable plate is not caught by the cover, and the earth leakage test movable plate is prevented from being broken.

According to the second aspect of the present invention, a protrusion having an inclined surface is formed on the inner wall of the body of the housing, and the earth leakage test movable plate is mounted on the inclined surface of the protrusion uniformly from near the base end thereof. As a result, the amount of bending of the leakage test movable plate is reduced, and the leakage test movable plate is prevented from being broken. According to the invention of claim 3, a pin is provided on the opposite side of the fixed contact with the movable board for the leakage test on the printed circuit board, and the pin is left in the vicinity of the free end of the movable board for the leakage test depending on the bending amount of the movable board for the leakage test. However, since the movable contact plate is supported by the pin, the movable contact plate is prevented from catching on the body when the printed circuit board is assembled, and the printed circuit board is housed in the housing. It is easy to do.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the invention of claim 1 of a device for restricting a movable plate for an earth leakage test in an earth leakage breaker according to the present invention, showing an external perspective view of the earth leakage breaker. FIG. 3 is a schematic cross-sectional view taken along line XX ′ of FIG. 2.

A housing 1 (see FIG. 2) is constituted by a body 2 in which the internal mechanism of the earth leakage breaker is laterally fitted, and a cover 3 for closing the opening of the body 2.
FIG. 3 is a schematic cross-sectional view of FIG. 1 with the cover 3 removed. The leakage test button t is partly projected from the housing 1 and is held in a state of being sandwiched between the body 2 and the cover 3. The leakage test button t has a base end side (fixed end side). ) Is located on the inner side of the body 2, and the tip side (free end) is held in a state of protruding from the opening b of the body 2.

A protrusion (or rib) 6 having a straight surface 6'is provided on the inner wall of the body 2 of the housing 1, and the deflection amount of the leakage test movable plate 4 depends on the amount of bending of the leakage test movable plate 4. Near the free end x, the straight surface 6'of the projection 6
It is to be brought into contact with the upper corner portion 7 (see FIG. 3). Since the protrusion 6 supports the vicinity of the free end x of the leakage test movable plate 4, the upper corner portion 7 of the straight surface 6'of the protrusion 6 is subjected to the leakage test even when the body 2 is covered with the cover 3. The position of the movable plate 4 for electric leakage is regulated so that the free end x of the movable plate 4 for electric leakage test is not caught on the cover 3, and therefore the movable plate 4 for electric leakage test is prevented from being broken.

The earth leakage test movable plate 4 is bent inwardly of the housing 1 by the pressing operation of the earth leakage test button t, and by contacting the fixed contact 5 for the earth leakage test circuit in the housing 1. , It is tested and confirmed whether or not the electric circuit k of the main circuit is surely interrupted by applying a pseudo leakage current to the trip coil c of the internal electric circuit of the current operation type earth leakage breaker shown in FIG. To do.

FIG. 4 is a schematic cross-sectional view showing an embodiment of the invention of claim 2 of the device for controlling a movable plate for earth leakage test in an earth leakage breaker according to the present invention, and FIG. 5 shows a cover 3 in FIG. FIG. 4 is a schematic cross-sectional view of a state in which is removed, corresponding to FIGS. 1 and 3 described above, respectively, and in FIGS. 4 and 5, parts corresponding to FIGS. Therefore, the description thereof is omitted.

In the second embodiment, the above-mentioned first
The difference from the embodiment is that the protrusion (or rib) 6 provided on the inner wall of the body 2 of the housing 1 is formed with an inclined surface 6 ″, and the movable plate 4 for earth leakage test has its base. That is, the protrusions (or ribs) are mounted evenly along the inclined surface 6 ″ of the protrusion 6 from near the end. Therefore, the amount of bending of the leakage test movable plate 4 with respect to the protrusion (or rib) 6 can be reduced, and the leakage test movable plate 4 is prevented from being broken.

FIG. 6 is a schematic sectional view showing an embodiment of the invention of claim 3 of a device for regulating a movable plate for an earth leakage test in an earth leakage breaker according to the present invention, and FIG. 7 shows a cover 3 in FIG. FIG. 6 is a schematic cross-sectional view of a state in which is removed, corresponding to FIGS. 1 and 3 described above, respectively, and in FIGS. 6 and 7, parts corresponding to FIGS. Therefore, the description thereof is omitted.

In the third embodiment, the above-mentioned first
The difference from the embodiment is that a pin m is provided on the side opposite to the fixed contact (not shown) with the movable board 4 for leakage test sandwiched between the printed circuit boards, and the amount of deflection of the movable board 4 for leakage test is left to the user. That is, the vicinity of the free end of the earth leakage test movable plate 4 is supported by the pin m. Therefore, it is possible to reduce the amount of bending of the leakage test movable plate 4 with respect to the pin m.
Similarly to the invention described above, the movable plate 4 for leakage test is prevented from being broken.

In FIG. 8, reference numeral 8 is an opening / closing section of the electric circuit k of the main circuit shown in FIG. 11, and 9 in FIGS. 1 to 10 is an opening / closing handle of the electric circuit k of the main circuit.

[0021]

EFFECTS OF THE INVENTION According to the present invention, the device for regulating the movable plate for the leakage test in the leakage breaker has the following effects. According to the invention of claim 1, a protrusion having a straight surface is provided on the inner wall of the body of the housing, and the vicinity of the free end of the leakage test movable plate is supported at the upper corner of the straight surface of the protrusion. When the cover is attached to the cover, the upper corner of the straight surface of the protrusion regulates the position of the leakage test movable plate so that the free end of the leakage test movable plate does not get caught in the cover, and the leakage test movable It prevents the plate from breaking.

According to a second aspect of the present invention, a protrusion having an inclined surface is provided on the inner wall of the housing body, and the earth leakage test movable plate is mounted from near the base end of the movable plate evenly along the inclined surface of the protrusion. Therefore, the amount of bending of the leakage test movable plate with respect to the protrusion can be reduced, and the leakage test movable plate can be more reliably prevented from being broken. According to a third aspect of the present invention, a pin is provided on the opposite side of the fixed contact with the leakage test movable plate sandwiched between the printed circuit boards, and a pin is provided near the free end of the leakage test movable plate depending on the bending amount of the leakage test movable plate. However, since the movable contact plate is supported by the pins, the movable contact plate is prevented from being caught by the body when the printed circuit board is assembled, and the movable plate for earth leakage test is broken as in the invention of claim 2. And prevents the printed circuit board from being housed in the housing.

[Brief description of drawings]

FIG. 1 shows a device for restricting a movable plate for an earth leakage test in an earth leakage breaker according to the invention of claim 1, which is indicated by X in FIG.
It is a schematic sectional drawing in the line -X '.

FIG. 2 is an external perspective view of an earth leakage breaker.

FIG. 3 is a schematic cross-sectional view of FIG. 1 with a cover removed.

FIG. 4 is a schematic cross-sectional view showing a device for restricting a movable plate for an earth leakage test in an earth leakage breaker according to the invention of claim 2.

5 is a schematic cross-sectional view of FIG. 4 with a cover removed.

FIG. 6 is a schematic sectional view of a device for restricting a movable plate for an earth leakage test in an earth leakage breaker according to a third aspect of the invention.

7 is a schematic cross-sectional view of FIG. 6 with a cover removed.

FIG. 8 is a front view showing an internal mechanism of the earth leakage breaker.

FIG. 9 is a schematic cross-sectional view of a conventional earth leakage breaker.

FIG. 10 is a schematic cross-sectional view of the same as above with the cover removed.

FIG. 11 is an internal electric circuit diagram of a current-operated type earth leakage breaker.

[Explanation of symbols] 1 housing 2 body 3 cover 4 Movable plate for earth leakage test 5 Fixed contact for earth leakage test circuit 6 protrusions Straight surface of 6'projection 7 Upper corner of straight surface x Free end of movable plate for earth leakage test t Button for earth leakage test A body opening a Differential current transformer

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasushi Matsui 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-6-52786 (JP, A) JP-A-53-84179 ( (58) Fields investigated (Int.Cl. ⁷ , DB name) H01H 83/04 H01H 73/06

Claims (3)

(57) [Claims] 1. A housing comprising a body in which an internal mechanism of an earth leakage breaker is laterally fitted and a cover closing an opening of the body, and a button for earth leakage test has a part protruding from the housing, It is held in a state of being sandwiched between the body and the cover, and the base end side of the leakage test button is located inside the body and the tip end side is held protruding from the body opening. And
When the earth leakage test movable plate attached to the printed circuit board comes into contact with the fixed contact for the earth leakage test circuit mounted on the printed circuit board by pressing the button for the earth leakage test, a pseudo leakage current is generated in the trip coil. In order to confirm whether or not the electric circuit is surely interrupted, the leakage breaker is provided with a protrusion with a straight surface on the inner wall of the housing body, and it is left to the amount of deflection of the leakage test movable plate. its leakage free end near the test movable plate Te is, are supported on the upper corner of the straight surfaces of the projections, the cover body
The upper corner of the straight surface of the projection is
A device for restricting a movable plate for an earth leakage test in an earth leakage breaker, characterized in that the position of the movable plate for a strike is restricted. 2. A housing comprising a body in which an internal mechanism of an earth leakage breaker is laterally fitted and a cover which closes an opening of the body is constituted, and a button for earth leakage test has a part protruding from the housing, It is held in a state of being sandwiched between the body and the cover, and the base end side of the leakage test button is located inside the body and the tip end side is held protruding from the body opening. And
When the earth leakage test movable plate attached to the printed circuit board comes into contact with the fixed contact for the earth leakage test circuit mounted on the printed circuit board by pressing the button for the earth leakage test, a pseudo leakage current is generated in the trip coil. In order to confirm whether or not the electric circuit is surely interrupted, the leakage breaker is provided with a protrusion with an inclined surface on the inner wall of the housing body. It is installed evenly along the slope of the protrusion from near the edge , and even if the cover is attached to the body, the protrusion
The sloping surface regulates the position of the movable plate for the leakage test, and is a device for regulating the movable plate for the leakage test in the leakage breaker. 3. A housing comprising a body in which an internal mechanism of an earth leakage breaker is laterally fitted and a cover closing an opening portion of the body, and a button for earth leakage test is configured such that a part thereof protrudes from the housing and It is held in a state of being sandwiched between the body and the cover, and the base end side of the leakage test button is located inside the body and the tip end side is held protruding from the body opening. And
When the earth leakage test movable plate attached to the printed circuit board comes into contact with the fixed contact for the earth leakage test circuit mounted on the printed circuit board by pressing the button for the earth leakage test, a pseudo leakage current is generated in the trip coil. In order to confirm whether or not the electric circuit is surely interrupted, the leakage breaker is provided with a pin on the side opposite to the fixed contact with the movable board for leakage test of the printed circuit board in between. the free end near the earth leakage test movable plate left to deflection amount of use the movable plate are supported on the pin, body
The pins can be used for earth leakage test even when the cover is attached to
A device for regulating a movable plate for an earth leakage test in an earth leakage breaker, which is characterized in that a position of a moving plate is regulated.