JP3143292B2 - Manual tripping mechanism of 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 manual tripping mechanism for an earth leakage breaker capable of mechanically tripping the contacts of the earth leakage breaker from the outside.

[0002]

2. Description of the Related Art FIG. 9 is a cross-sectional view showing a conventional manual tripping device for a circuit breaker disclosed in, for example, Japanese Utility Model Laid-Open No. 2-136953. In the drawing, 1 is a cover, 2 is a trip button attached to the hole 1a of the cover 1, 3 is an arm extending substantially perpendicular to the trip button 2, 4 is a biasing spring of the trip button 2, 5 Is a movable iron piece of the overcurrent electromagnetic device.

Next, the operation will be described. When an accidental current such as an overcurrent occurs in a circuit breaker, the main circuit contacts are automatically opened by an overcurrent electromagnetic device that is an overcurrent detection device provided for each pole. Regardless of the generation of current, for example, to change the wiring or to check the operation of the built-in alarm switch, etc., to provide a trip operation for mechanically opening the main circuit contact, It is a manual trip device. When the trip button 2 provided on the circuit breaker cover 1 is pressed, the movable iron piece 5 of the electromagnetic device is rotated by the arm 3 extended to the trip button 2, and the pull provided inside the circuit breaker is pressed. The latch of the release mechanism is disengaged and the main circuit contact is released.

[0004]

A conventional manual tripping device for a circuit breaker has a trip button 2 and a biasing spring 4 attached to a hole 1a formed in a cover 1 of a circuit breaker shell. Since the arm portion 3 extending to the trip button 2 is incorporated, the assembly becomes complicated, and the movable iron piece 5 which is a part of the electromagnetic device fixed to the base 6 side;
Easily misaligned relationship between trip bar attached to the cover 1 side, and in the case of performing the operation check is only in a state in which a combination of a cover 1 and a base <br/> over scan can not verify the operation timing However, there has been a problem that the manual tripping device must be expensive and unstable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a small-sized manual tripping mechanism for an earth leakage breaker having good assemblability, high operation reliability and small size. I do.

[0006]

According to a first aspect of the present invention, a manual tripping mechanism for an earth leakage breaker includes a cover having a through hole communicating with the inside of the circuit breaker, a button portion sliding in the through hole, and a sliding member. A trip button comprising an arm portion extending substantially perpendicular to the moving direction and a sliding shaft portion extending in the sliding direction, and a trip button partially extending between poles of an adjacently arranged electric circuit. An insulating case fixed to the base and accommodating an electronic circuit or the like therein, fixed to the base and provided at each pole of the electric circuit; A plurality of yokes constituting a magnetic circuit at the time of overcurrent of each of the poles, and at least one yoke of the plurality of yoke pivotally engaged with the inside of the circuit breaker of the trip button. When sliding, the joint is rotated by contacting the sliding arm. At least provided with one movable iron piece, covering the through hole of the performing operation and substantially the same operation at the time of excitation
Around the edge of the circuit breaker.
When the trip button is provided with a recess surrounding the outside of the
The button protrudes from the center of the recess toward the inside of the through hole.
In which it was to be out.

According to a second aspect of the present invention, there is provided a manual tripping mechanism for an earth leakage breaker, wherein a cross section of a sliding shaft of a trip button is rectangular and a cylindrical groove of an insulating case also corresponds to the cross section of the shaft. It is what it was.

According to a third aspect of the present invention, there is provided a manual tripping mechanism for an earth leakage breaker, wherein a projection-shaped flange is provided at a tip end of a slide shaft extending in a direction opposite to a button portion of a trip button. A slit for bending in a direction substantially perpendicular to the sliding direction is provided, and a hole smaller than the diameter of the collar portion into which the collar portion of the trip button is fitted is provided at the bottom of the cylindrical groove portion of the insulating case, Further, an elastic member for constantly urging the trip button outward is provided.

[0009]

According to the first aspect of the present invention, when the earth leakage breaker is turned on, by pressing the button portion of the trip button, the sliding shaft portion overcomes the biasing spring force and breaks along the cylindrical groove. Move inside. At this time, the arm portion of the sliding shaft portion presses at least one movable iron piece, and rotates the movable iron piece around the engaging portion with the yoke. The rotation of the movable iron piece is the same as the operation at the time of suction by the yoke when an overcurrent flows in the electric circuit of the earth leakage breaker, and the contact of each pole is cut off in conjunction with this rotation. Note that the insulating case is a case that houses an electronic circuit or the like of the earth leakage breaker, a part of which extends between the poles of adjacent electric circuits, and separates the pole spaces of the electric circuits. The circular recess of the trip button is assembled
Surrounds the edge around the through hole with an appropriate gap
When the end face of the edge and the bottom face of the circular recess come into contact with each other,
And remove the button from the through hole when pressing the trip button.
Less likely to be.

In the second aspect of the present invention, since the cross section of the sliding shaft of the trip button and the shape of the cylindrical groove of the insulating case are rectangular, the arm of the trip bar must be used when the trip button and the insulating case are combined. The part comes to a position where it comes into contact with a movable iron piece arranged on an adjacent electric circuit, and the direction of assembly is determined.

According to the third aspect of the present invention, the slit of the trip button bends inwardly in a direction substantially perpendicular to the sliding direction when the flange having a slightly larger diameter is fitted into the hole of the insulating case. The fitting can be performed, and after the fitting is completed, the collar portion is returned to the original diameter to prevent the trip button from projecting due to the upward biasing force of the return spring.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 is a plan view in which a part of the earth leakage breaker is broken, FIG. 2 is an exploded perspective view of a main part of the manual tripping device in FIG. 1, and FIG. 3 is a diagram in which the manual tripping device in FIG. FIG. 4 is a cross-sectional view of a main part of the manual trip device,
5 and 6 are operation explanatory views showing a cross section of a main part of the manual tripping device of FIG. 1, and FIGS. 7 and 8 are cross-sectional views showing a sliding shaft portion of a trip button of the manual tripping device of FIG. It is.

In FIG. 1, the outside of the earth leakage breaker is
It comprises a circuit breaker shell cover 6, a circuit breaker shell base 7, a power supply terminal 8, a load terminal 9, and a handle 10. The cover 6 between the handle 10 and the load terminal 9 has a through hole 6a communicating therewith. The button portion 11a of the trip button 11 that slides inside the through hole 6a is incorporated. The trip button 11 is used to manually set a contact of the earth leakage breaker to a trip state from outside the circuit breaker. This is used for confirming the operation such as. Inside the earth leakage breaker, a breaking mechanism for transmitting the movement of the handle 10 and the operation at the time of breaking to each internal element,
A contact portion for connecting and disconnecting an electric circuit, an electromagnet device for detecting overcurrent and short-circuit current, and an arc-extinguishing device are incorporated, and a leakage current generated in the electric circuit is detected and a signal is transmitted to the breaking mechanism. An earth leakage trip device including an electronic circuit or the like for opening an electric circuit is provided.

Next, a manual tripping mechanism of the earth leakage breaker which is a main part of the present invention will be described. In FIG. 2, the trip button 11 includes a cylindrical button portion 11a disposed inside the through hole 6a of the cover 6, and a button portion 11a.
and a sliding shaft portion 11b extending downward in the same direction as the sliding direction, and projecting in a direction substantially perpendicular to the sliding direction from a joint portion between the button portion 11a and the sliding shaft portion 11b, and opposite to each other. Two arm portions 11c extending in the direction are provided. Also, a button portion 11a and two arm portions 11c
And the button portion 11a in the same direction as the sliding direction.
A recess 11d extending downward from the side is formed in a substantially circular shape. Further, a semi-spherical convex part 11e is formed on the surface of the two arms 11c at the end opposite to the button part 11a. A further lower side of the sliding shaft portion 11b extending downward from the button portion 11a is provided with a second sliding shaft portion 11f smaller than the outer diameter of the sliding shaft portion 11b and a second sliding shaft portion 11f. A protruding flange 11g having a diameter slightly larger than the outer diameter of the second sliding shaft 11f and smaller than the outer diameter of the sliding shaft 11b is formed at the tip of the shaft 11f. Further, a slit 11h is formed in the sliding direction from the foremost end of the collar portion 11g, thereby enabling deflection in a direction perpendicular to the sliding direction of the collar portion 11g.

Numeral 12 denotes an insulating case, which is disposed inside the earth leakage breaker adjacent to the load terminal part 9 and has a cylindrical box part 12 for accommodating the electronic circuit part 13 of the earth leakage trip device described above.
a and is fixed to the circuit breaker shell base 7. The insulating case 12 has a cylindrical shape that extends so as to shield a gap between adjacent electric circuits at a position opposite to the load terminal portion 9 and that slides and guides the sliding shaft portion 11b of the trip button 11. A groove 12b is formed. The bottom of the cylindrical groove 12b has a locking surface 12c perpendicular to the sliding direction, and a projection 11g of the trip button 11 is provided substantially at the center of the locking surface 12c. A press-fit hole 12d is formed. And this hole 12d is
The diameter is slightly smaller than the outer diameter of the flange 11g and slightly larger than the outer diameter of the second sliding shaft 11f.
The locking surface 12c of the insulating case 12 and the trip button 1
The second sliding shaft 11f is located between the first sliding shaft 11b and the first sliding shaft 11b.
A return spring 14 is fitted into the device. The return spring 14 always urges the trip button 11 upward, but this urging force is applied to the locking surface 12 of the insulating case 12.
The projection of the trip button 11 upward is prevented by the engagement of the c with the flange 11g of the trip button 11.

A yoke 15 is arranged on both sides of a cylindrical groove 12b extending between the poles of adjacent electric circuits of the insulating case 12, and the yoke 15 is fitted into the groove 7a of the base 7. The bent yoke 15a is formed and the yoke 15 is firmly fixed by pressing the inner surface of the groove 7a.
The lower end of the yoke 15 is bent at a substantially right angle, and a fixed core 16 of the electromagnet device is inserted into a hole 15b formed therein.
Is pierced. The fixed core 16 has a winding 17
Is provided on the outer periphery, and when a short-circuit current or the like flows, the coil becomes an electromagnetic coil, applies a magnetic force to the fixed iron core portion 16, and attracts the movable iron piece 18. This movable iron piece 1
8 is engaged with the upper end of the yoke 15, and the projection 18 a and the bent portion 18 b of the movable iron piece 18 are movably engaged with the yoke 15. That is, the concave portion 18 c of the movable iron piece 18 is movably locked to the concave portion 15 c of the yoke 15. Also,
At one end of the movable iron piece 18, an adsorbing portion 18d to be adsorbed to the fixed iron core portion 16 is formed, and at the other end, a lever portion 18e is formed.

Further, the lever portion 18 of the movable iron piece 18
e and a yoke 15, a tension spring 19 is attached. The tension spring 19 is connected to the lever 1 of the movable iron piece 18.
8e is always in the direction of the yoke 15 centering on the engagement portion (FIG. 5).
(In the counterclockwise direction). A trip bar 20 is provided near the lever portion 18e. The trip bar 20 is interlocked with a latch mechanism for tripping the contact portion. When the trip bar 20 is moved leftward from the position shown in FIG. 5, the contact portion is instantly tripped. .

Next, the operation will be described. In FIG. 5, when the button portion 11a of the trip button 11 inserted into the through hole 6a of the cover 6 is pressed downward (in the direction of arrow A),
The trip button 11 is a cylindrical groove 12b of the insulating case 12.
Move down along. With the movement of the trip button 11, a convex portion 11e formed on the lower surface side of the arm portion 11c.
Presses the movable iron piece 18 to rotate the movable iron piece 18 in the direction of arrow B. At this time, the movable iron piece 18 is
Is turned against the force of Thereby, the movable iron piece 1
8 is in the same state as the state where it is sucked to the upper end of the fixed iron core 16. This state is shown in FIG.

As shown in FIG. 6, when the movable iron piece 18 is rotated and the suction portion 18d comes into contact with the upper end of the fixed iron core portion 16, the lever portion 18e of the movable iron piece 18 moves the release rod 20 in the direction of arrow C. Move. The tripping rod 20 is interlocked with a latch mechanism for instantaneously pulling out the contact portion. When the tripping bar 20 moves in the direction of arrow C, the engaging portion of the latch mechanism is disengaged and the contact portion is instantly pulled off. As a result, the electric circuit is opened.

Next, when the trip button 11 is released,
The trip button 11 is moved outward of the circuit breaker shell by the return spring 14, and the circular recess 11 of the trip button 11 is moved.
The bottom surface of d and the end surface 6c of the edge 6b of the cover 6 come into contact with each other and return to the position shown in FIG. At this time, trip button 1
The one flange 11g and the locking surface 12c of the insulating case 12 come into contact with each other or stop with a slight gap.

At the same time, the movable iron piece 18 also returns to the position shown in FIG. At this time, the earth leakage breaker is configured so that the position of the handle 10 is at an intermediate position between ON and OFF, and has a structure that can confirm from the outside that the contact portion is open.
When turning on the circuit breaker again, turn the handle 10 off.
It is moved to the F position to reset the internal mechanism of the earth leakage breaker to the initial state, and then is turned on to the ON position to close the contact.

As shown in the above embodiment, the trip button 1
As shown in FIG. 7 or FIG. 8, the sectional shape of the insulating case 12 that guides and slides the sliding shaft portion 11b is shown in FIG. When the cylindrical groove portion 12b has a rectangular shape corresponding to the rectangular cross section of the sliding shaft portion 11b, the arm portion 11c of the trip button 11 is always arranged on the adjacent electric circuit when the trip button 11 and the insulating case 12 are combined. Since the position comes into contact with the movable iron piece 18, the direction of assembly is determined and the assemblability is improved.

Further, as shown in the above embodiment, a slit 11h is provided at the lowermost end of the trip button 11, and the flange portion of the trip button 11 having a slightly larger diameter than the hole 12d of the cylindrical groove 12b of the insulating case 12 is provided. When the flange 11g is provided, the collar 11g bends inward in a direction substantially perpendicular to the sliding axis direction when the collar 11g is fitted, so that the fitting becomes easy, and after the fitting is completed, the collar 11g is removed. , The return spring 14 can prevent the trip button 11 from projecting.

Further, as shown in the above embodiment, the circular recess 11d of the trip button 11 is disposed so as to surround the edge 6b of the cover 6 with an appropriate gap, and the edge 6b is If the button portion 11a is extended so as to be sufficiently supported in the sliding direction, the end surface 6c of the protruding edge portion 6b abuts against the bottom surface of the circular concave portion 11d, so that when the trip button 11 is pressed, Thus, the button portion 11a does not easily come off from the through hole 6a.

In the above embodiment, a three-pole circuit breaker has been described. However, a two-pole or four-pole earth leakage breaker may be provided with the tripping mechanism of the present invention between any adjacent poles. By linking with other poles, the same effect as in the above embodiment can be obtained.

[0026]

As described above, according to the present invention, a manual tripping machine utilizing a part of an insulating case for accommodating an electronic circuit is provided.
By constituting the structure and using the manual tripping device to also serve as the inter-electrode shielding wall of the adjacent electric circuit, a more compact earth leakage breaker can be provided.
Furthermore, by combining the essential parts of the manual tripping mechanism so as to be integrated with the insulating case fixed to the base, not only the number of parts can be reduced, but also the assembling can be performed easily and the cover can be removed. It can also facilitate the operation check of the manual trip mechanism portion before completing assembling the breaker without attaching, reliable fault interrupter manual tripping machine
There is an effect that a structure can be obtained. Also, through holes in the cover
Edge extending toward the inside of the circuit breaker, and a through hole
A button part fitted and slid inside, and a button part
So that a circular recess provided in the periphery surrounds the edge
With the configuration, the button part faces the inside of the circuit breaker.
When pressing and sliding, the through hole and the button
And the trip button is
There is no worry about coming off. Also, the edge end face and the trip button
And the bottom of the circular recess
With this, a trip button provided inside the cover through-hole is provided.
From the gap between the button and the button
It prevents dust and dirt from entering, and
Sufficient electrical insulation from internal components
The effect is obtained.

Further, the sliding shaft portion of the trip button and the cylindrical groove portion for guiding the sliding of the insulating case are formed in a rectangular cross section, so that the direction from the power supply terminal portion of the earth leakage breaker to the load terminal portion is reduced. Thus, the effect is obtained that the arm portion of the trip button is always positioned at a right angle, and the trip button is assembled so as to accurately contact the movable iron piece.

Further, a convex flange and a slit are provided at the lowermost end of the trip button, and a hole having a diameter slightly smaller than the diameter of the flange is provided on the bottom surface of the cylindrical groove of the insulating case. By elastically press-fitting, and by fitting a return spring between the bottom surface of the cylindrical groove of the insulating case and the slide shaft of the trip button, the return spring being fitted to the second slide shaft of the trip button. The trip button is held firmly, and the return spring can be prevented from coming off or buckling, thereby providing an effect that a stable manual trip operation can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of an earth leakage breaker showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view of the manual tripping mechanism of FIG.

FIG. 3 is a plan view of a main part of the manual tripping mechanism of FIG. 1;

FIG. 4 is a sectional view of a main part of the manual tripping mechanism of FIG. 1;

FIG. 5 is an operation explanatory view of the manual tripping mechanism of FIG. 1;

FIG. 6 is an operation explanatory view of the manual tripping mechanism of FIG. 1;

FIG. 7 is a cross-sectional view of a sliding shaft portion of a trip button of the manual tripping mechanism of FIG. 1;

FIG. 8 is a cross-sectional view of a slide shaft of a trip button different from FIG. 7;

FIG. 9 is a sectional view of a main part of a conventional manual tripping mechanism .

[Explanation of symbols]

6 Cover 7 Base 11 Trip Button 11a Button 11b Sliding Shaft 11c Arm 12 Insulation Case 12b Cylindrical Groove 14 Return Spring 15 Yoke 16 Fixed Iron 17 Winding 18 Moving Iron 19 Tension Spring 20 Release Rod

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-194826 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 83/02

Claims (3)

(57) [Claims] 1. A cover having a through hole communicating therewith and constituting a circuit breaker shell, a button portion sliding in the through hole, an arm portion projecting in a direction substantially perpendicular to a sliding direction, and the sliding portion. A trip button having a sliding shaft portion extending in the direction opposite to the button portion in the moving direction, an electronic circuit portion, and the like are housed, and a part thereof is extended between the poles of an adjacently disposed electric circuit and extended. An insulating case fixed to a base constituting a circuit breaker outer shell, the insulating case having a cylindrical groove portion for guiding sliding of the trip button in the installation portion, and being provided at each pole of an electric circuit, respectively. A plurality of yoke forming a magnetic circuit at the time of overcurrent of the pole, and at least one yoke of the plurality of yoke is rotatably engaged with the yoke when the trip button slides inside the circuit breaker. Rotate by touching the arm of the trip button to move forward The cover includes at least one movable iron piece that operates substantially the same as the operation when the yoke is excited.
Around the through hole of the breaker
And the recess surrounding the outside of the edge
Button and the button part extends from the center of the recess.
A manual tripping mechanism for an earth leakage breaker, characterized in that it protrudes into the through hole . 2. The leakage breaker according to claim 1, wherein the cross section of the sliding shaft of the trip button is rectangular, and the cylindrical groove of the insulating case is also rectangular corresponding to the cross section of the shaft. Manual tripping mechanism. 3. A protruding flange portion is provided at a tip end of a sliding shaft portion extending in a direction opposite to a button portion of a trip button, and a slit for bending the flange portion in a direction substantially perpendicular to the sliding direction is provided. A hole smaller than the diameter of the collar portion into which the collar portion of the trip button is fitted is provided at the bottom of the cylindrical groove portion of the insulating case, and an elastic member that constantly biases the trip button outward is provided. The manual tripping mechanism for an earth leakage breaker according to claim 1 or 2, wherein: