JPH04163823A - Leakage tripper for leakage breaker - Google Patents

Abstract

PURPOSE:To prevent any erroneous operation due to a shock or vibration by applying, to driving pieces, rotating force in the latch tripping direction by the tip end of a plunger at the time of tripping while applying, to pressing pieces, rotating force in the reverse direction by the energization of a spring at the time of a normal operation. CONSTITUTION:When a solenoid 101 is excited upon detection of a leak current, a plunger 107 is drawn in to be moved so that a hook pin 107b at the tip end presses a driving piece 103e of a connecting link 103, thus turning the link 103 clockwise. With this turning, the lower end of a tripping driver 103f pressingly moves a pressing piece of a latch engagement plate to thus release a latched state. Consequently, a contact switching mechanism is tripped, thereby opening a contact. Meanwhile, the plunger 107 is usually energized by a spring, to apply, to bridging pieces 103c, 103d, rotating force in the direction reverse to that in the tripping operation. Therefore, the link cannot be turned in the latch tripping direction, thereby preventing any erroneous operation due to a shock or vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an earth leakage tripping device used in an earth leakage breaker.

[Prior art] Fig. 13 shows a schematic configuration of an earth leakage tripping device.
In the illustrated earth leakage tripping device, when the coil 105 of the electromagnetic solenoid 101 is excited by the output of the earth leakage detection circuit (not shown), the plunger 107 is pulled in, and as the plunger 107 is pulled in, the L-shaped tip of the first plunger 107 is linked. 3 to rotate the link 120 around the rotation shaft 119, and in conjunction with this rotation, the latch release member 117 of the trip mechanism of the earth leakage breaker is driven to trip the trip mechanism. There is. Such devices were usually numerous.

[Problems to be Solved by the Invention] However, in the configuration shown in FIG. There was a risk that it would rotate.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide an earth leakage tripping device for an earth leakage breaker that has excellent vibration resistance and shock resistance.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes an electromagnetic solenoid that is excited by the detection output of an earth leakage detection circuit, and an electromagnetic solenoid whose rear part is inserted into the center hole of the coil of the electromagnetic solenoid. One rungear is pulled backward into the coil and moved when the solenoid is energized, and is spring-biased toward the tip when not energized, and the other is rotatably supported on the breaker body and is pushed and driven by the tip of the plunger when the plunger is retracted. The latch release part H of the breaker trip mechanism
and a connecting link that drives the latch in the latch pulling direction, and the connecting link has a driving piece that is pushed and driven by the tip of the plunger when the seven plungers are retracted, and is given a rotational force in the latch pulling direction. and a pressing piece that is pressed by the tip of the spring-biased plunger and applies a rotational force in the opposite direction to the rotational force applied to the drive piece in normal operation. According to the present invention, the connecting link includes a drive piece that is pushed and driven by the plunger tip when the granger is retracted to apply rotational force in the latch removal direction, and a drive piece that is pushed by the tip of the plunger that is normally biased by a spring. Since it is equipped with a pressing piece that applies a rotational force in the opposite direction to the rotational force applied to the drive piece, shocks, vibrations, etc. are applied, and the same force is applied to the connecting link in the direction of latch removal. Even if the tip of the plunger is spring-biased, the pressing piece is pushed and the latch is pulled out. This prevents the earth leakage breaker from malfunctioning due to shock, vibration, etc.

On the other hand, when the seventh langeer is retracted when an earth leakage is detected, rotational force can be applied to the connecting link in the latch removal direction, and the latch removal operation is not affected by the above-mentioned malfunction prevention mechanism.

[Example] The present invention will be explained below with reference to Examples.

FIG. 1 shows an exploded perspective view of this embodiment, in which an earth leakage tripping device is constructed from an earth leakage tripping block C in which an electromagnetic solenoid 101 and an earth leakage display mechanism are integrated, and a connecting link 103. .

The electromagnetic solenoid 101 of the Weiden pull-out device is operated by the output of the detection circuit described in Section 5. As shown in FIG. 2, it has a holding frame 104 made of synthetic resin. A coil 105 is wound around one end of the coil. The holding frame 104 has a carp/L・l (both magnetic poles 1 of 1B)
Two yokes 106 are hidden so as to straddle the m. 1゛,wo-; 10 (,
A plunger 3.07 made of a magnetic material is connected to the coil 1 through
It is inserted into 05. One end of the plunger 107 protrudes from the holding frame 104 so as to move forward and backward, and the plunger 107 is biased in the direction of protruding from the holding frame 104 by a return spring 109 disposed within the holding frame 104. Holding frame 104
A display button 108 is inserted into the interior of the plunger 107 so as to be movable perpendicular to the forward and backward direction of the plunger 107.
08 is urged upward in FIG. 1 by a return spring 110.

1. The 1 langeer 107 has a tip bent in the shape of .I2, and has a notch 107a at the lower edge. , put the bow 1 hanging bottle 107 b in the fS minute G section! I7 is there.゛Notch l f"1"7' of Laranshi 607; (Between the left end and the left end, the vertical width of the base side is the tip u'141") is also small. A stepped portion 107c is formed on the edge 2, =-1 knee portion 1.0'7 c and r'+17.' return spring 1
In addition, the plunger 107 has a lower width behind the notch I LJ 'ia, and the lower width of the base source is wide.・?・
As shown, the stepped portion 107d is 6.
, Jinkonishiki 108 is displayed at the top of the flf layer 'x') 5
a, and 61 i''' in the middle part in the 1-↑゛ direction;
A super hole 108b is formed into which the plunger 107 is inserted. Additionally, an L-shaped hook piece 108 is provided on the side of the display button 108.
C is provided. A spring seat protrusion (not shown) is provided on the upper edge of the through hole 108b, and the return spring 110 is
It is held between the holding frame 104, the yoke 106, and the spring seat protrusion.

A test switch 111 is formed in the holding frame 104, and a test button 15 projects from the upper surface of the container body 10 at a position corresponding to the test switch 111.

This test switch 111 establishes conduction between the electric circuits via an appropriate resistance, and is provided for the purpose of creating a pseudo current leakage state and confirming the operation of the earth leakage tripping device.

When the opening/closing contact mechanism of the earth leakage breaker is closed, the display button 108 engages a hooking piece 108C provided on the side with a driver 60c provided on the side of the handle 60, which will be described later, and the opening/closing contact mechanism is opened. The engagement with the driving body 60c is released when the driving body 60c is in the extreme position.

As shown in FIG. 3, the connecting link 103 has a rotating shaft 103b integrally projecting from the outer surface of the tip of both sides of the U-shaped link body 10:3a. It is rotatably supported on the body 23. Also, bridging pieces 103c and 103d are integrally bridged between the tips of both side pieces, and are arranged in parallel so that they are located front and back and above and below, and between these bridging pieces 1'03c and 103d, The wedge-shaped tip of the plunger 107 is inserted through the plunger 107, and the lower bridging piece 103C located on the tip side of the plunger 107 is inserted into the plunger 107 which is biased by a spring.
constitutes a pressing piece that is pushed and driven by the plunger 10.
A driving piece 103e that is pushed by a hook pin 107b when the plunger 107 is pulled in is provided at one end base of the upper bridging piece 103d, which is located on the side where the bridging piece 7 is pulled into the coil 105 by the electromagnetic solenoid 101 and moved.

Further, on the outer surface of the other end of the bridging piece 103d, a tripping drive body 1 is provided for tripping and driving a latch engagement plate 53, which is a latch tripping member of a tripping mechanism of an earth leakage breaker, which will be described later.
03f is provided integrally.

Figures 4 to 12 show an earth leakage breaker that incorporates the earth leakage tripping device of the present invention and can be controlled remotely, and this earth leakage breaker includes an electromagnet block A for remote control and is controlled by the electromagnet block A. It consists of a contact opening/closing mechanism part B. Additionally, this breaker has a three-pole structure for three phases.

This electromagnet block A is constructed as shown in FIG. 5(b). In other words, a storage recess 2 is formed in a box-shaped mounting base 1 that is open at the top and made of an insulating material.
An electromagnet section 3 is housed inside. The electromagnet section 3 includes a coil 5 wound around the outer periphery of a coil bobbin 4, a fixed iron core 6, a movable iron core 7 that is attracted to the fixed iron core 6 by the magnetic attraction force of the coil 5, and the like. The fixed core 6 is formed in a substantially U-shape, and the core portions 6a on both sides are inserted into the through hole 4a of the coil bobbin 4 such that the end surface of the core portion 6a slightly protrudes toward the opening surface. The movable core 7 is fixed within a U-shaped fixed plate 9, and the movable core 7 is disposed with a spring 10 interposed between the movable core 7 and the coil bobbin 4. The spring 10 is mounted on a protrusion 4b protruding from the side surface of the coil bobbin 4. The conversion shaft 11 formed in a substantially U-shape converts the horizontal movement of the movable iron core 7 into the vertical direction, and the shaft 13 is inserted into a shaft hole 11a bored in the axial direction. This shaft 13 is pivotally supported at both ends within the stepped portion 14 of the mounting base 1, and the conversion shaft 11
is rotatable.

Hole 1 of central protrusion 12 protruding from the center of conversion shaft 11
2a and the hole 17 of the connecting piece 17 formed in the fixed plate 9.
The 0-shaped pin 16 is inserted into a.

The conversion shaft 11 is rotatably connected to the movable iron core 7 side by the 0-shape 716. Further, one ends 18a of the connecting pins 18 shown in FIG. 5(a) are inserted through holes 15a of the side pieces 15 formed on both sides of the conversion shaft 11 to be connected. However, as shown in FIG. 6(b), the electromagnet portion 3 configured in this way is placed in the storage recess 2 of the mounting base l.
A damper 19 is provided on the side surface of the fixed iron core 6 and is housed therein. Also, the mounting on the opposite side where the electromagnet part 3 is arranged is an expansion recess 8a connected to the side of the storage recess 2 of the base 1.
As shown in FIG. 7, there is a zero-phase current transformer 112 for the earth-leakage detection circuit, and a leakage current for amplifying the detection signal of the zero-phase current transformer 112 and generating an excitation current for driving the electromagnetic solenoid 101. A circuit block 113 mounted with a detection circuit is housed and arranged.

Next, the contact opening/closing mechanism section B will be explained. The upper surface of the body 23 made of an insulating material is provided with a mechanism housing section 2 through a partition wall 24.
Three 5's are formed. As shown in Figure 5(a), 3
The interlocking plate 26, which interlocks the poles and is made of an insulating material, has three holes 26a.
The movable contact 27 is inserted into the hole 26a. Further, a contact pressure spring 28 is installed in this hole 26a to apply appropriate contact pressure to the movable contactor 27. A recess 26c is formed in the lower surface of the interlocking plate 26, and an opening spring 2 is inserted into the recess 26c to bias the interlocking plate 26 upward.
9 is attached, and the two opening springs are attached as shown in Fig. 9 (a).
As shown in >, it is housed in a recess 30 formed in the body 23.

The interlocking plate 26 is inserted into the slit 31 of the partition wall 24 of the body 23 and is arranged so as to span each mechanism storage section 25. A sensor for detecting overcurrent and short-circuit current is arranged in the mechanism storage part 25, and a short-circuit coil 33 is provided in a yoke 32 bent into a substantially U-shape. A driving pin 34 that can protrude from the upper and lower surfaces of the yoke 32 is mounted inside. A movable contact 36 is provided on the lower surface of the tip of the movable contact 27 .

L-shaped mounting pieces 37 are integrally formed from both sides of the lower part of the yoke 32, which forms a magnetic circuit with the short-circuiting coil 33, and a six-piece 37b is bored in each of the five mounting pieces 37. A tongue piece 27b is integrally formed approximately at the center of the movable contactor 27, and this tongue piece 27
A hole 27c is bored in b. The movable contact 27 is positioned between both mounting pieces 37, and a pin 86 is inserted through each hole 27c, 37b, so that the movable contact 27 is pivotally supported on the yoke 32 side. At this time, the movable contact 27 is connected to the hole 2 of the interlocking plate 26.
6a, the movable contact 27 receives a force in the clockwise direction around the pin 86 as shown in FIG. receive. Further, an arc horn 38 having a zero-shaped tip is provided from one end of the yoke 32, and three bimetals for detecting overcurrent are provided at the other end.

A current adjustment screw 40 is screwed onto the tip of the bimetal 39.

The frame 41, which is formed in a substantially U-shape, is shown in FIG. 9(a).
It is fixed to the body 23 by screws 42 from the bottom surface of the body 23, as shown in FIG. An arc-shaped long hole 44 is bored in both side plates 43 of the frame 41, and a U-shaped latch plate 48 and a substantially H-shaped link 45 are formed on the outer surface of the long hole 44.
The leg portion 46 is located, and the hole 46a of the leg portion 46, the notch hole 49a opening at the tip side of the latch plate 48, and the frame 41
A rotating shaft 50 is inserted through the elongated hole 44, and the link 45 and the latch plate 48 are rotatably connected to the frame 41 by the rotating shaft 50. On the other hand, a hole 48b is bored in the side piece 48a of the latch plate 48, and a shaft 41b provided on the frame 41 is inserted into the hole 48b, so that the latch plate 48 can freely rotate around the shaft 41b as a fulcrum. It will be pivotally supported by the frame 41.

A shaft support 53 formed in the center of the latch engagement plate 53
a is located between the protruding pieces 54 formed on the rear side of the frame 41, and the pin 55 is located between the hole 54a of the protruding piece 54 and the latch engagement plate 53.
The latch engagement plate 53 is inserted into the hole 53b of the shaft support 53a.
is rotatably supported around a pin 55 inserted through a projecting piece 54 of the frame 41. Three engaging portions 56 are protruded from the front side of the latch engaging plate 53.
is the head 34 of the drive bin 34 as shown in FIG. 10(a).
a and engages with the head 34a. Further, an engagement piece 57 whose tip is L-shaped from the lower surface of the latch engagement plate 53
is provided in a protruding manner, and this engagement piece 57 engages with an engagement recess 58 formed in the center piece 48c of the latch plate 48, so that the latch engagement plate 53 and the latch plate 48 are engaged with each other.

A driving piece 89 is attached by a pin 90 between the L-shaped attachment pieces 88 on both sides of the yoke 87, and the protruding piece 87a of the yoke 87
and the projecting piece 41c of the frame 41 are attached to each other with a corresponding pin (not shown).

A spring 91 is interposed between the lower protrusion 41d of the protrusion 41c and the tongue piece 87b of the yoke 87, thereby regulating the positioning of the yoke 87. A drive piece 89 attached to the yoke 87 is positioned on the back side of the latch engagement plate 53. Further, an adjustment plate 92 is integrally provided upward from the yoke 87, and by adjusting the inclination of the adjustment plate 92 with an adjustment screw 93 whose axis is eccentric from above, the inclination of the entire yoke 87 can be adjusted. The level of overcurrent that causes a trip operation can be adjusted by adjusting the slope. Further, a spring 9 is formed between the protrusion 41e of the frame 41 and the concave portion 53d formed on the upper surface of the latch engagement plate 53.
4 is inserted to bias the latch engagement plate 53 in the direction of latching it with the latch plate 48.

An arm piece 59 is formed on the front side of the frame 41, and a hole 59a is bored at the tip of the arm piece 59. This arm piece 59
The lower part of the handle 60 is located between them, and the handle shaft 61 is inserted into the hole 60a drilled in the handle 60 through the hole 59a of the arm piece 59, so that the handle 60 can freely rotate around the handle shaft 61 in the frame 41. It will be installed. handle 6
A protrusion 60b is protruded from the side surface of 0, and this protrusion 6
One end of a reversing spring 62 that positions the off position and on position of the handle 60 beyond the dead center is locked to 0b. The handle 60 also has a link 4 when the handle 60 is placed in the off position as shown in FIG. 9(C).
A pressing piece 68 is formed to press the link 45 downward in order to set the link 45 to the initial position. The latch plate 48, the latch engagement plate 53, etc. constitute a trip mechanism, and the link 45, the conversion shaft 11, the interlocking plate 26, etc. constitute a link mechanism.

As shown in FIG. 5(a), one end of the spring 95 is locked in the hole 96 of the window 41f of the frame 41, and the other end is locked in the hole 96 of the window 41f of the frame 41.
As shown in Figure (a), the latch plate 48 is locked in the hole 48g in the front part of the latch plate 48, and when the latch is released by the spring 95, the latch plate 48 is urged in the clockwise direction.
The latch is released quickly. The handle shaft 61 is inserted through the insertion hole 97a of the arc-shaped display piece 97 and is disposed on the side of the handle 60. As shown in FIG. 9(c), the locking portion 97C of the display piece 97 and the link 4
5 are connected by a connecting bottle 98, and by changing the rotational position of the display piece 97 by the operation of the link 45 and the connecting bottle 98, a display portion 97b written on the surface of the display piece 97 is displayed from the display window 80a of the cover 80. I try to do that.

A limit switch 99 driven by a protrusion 60e of the handle 60 is arranged, and by operating the handle 60, the protrusion 60e drives an actuator 99a of the limit switch 99 to open and close internal contacts. It looks like this.

Further, a limit switch 100 for alarm notification is provided, and in the trip state, the protrusion 48d of the latch plate 48 drives the actuator 100a of the limit switch 100 to issue an alarm. Furthermore, link 4
Recesses 45a are formed on both sides of 5, and as shown in FIG.
As shown in FIG. 2, the link 45 is located at the top of the interlocking plate 26, and the recessed part 45a of the link 45 is located below the protrusion 26d which is protruded from the inside of the upper part of the interlocking plate 26, and the protrusion 26d The links 45 are arranged so as to sandwich the link 45 between them. With this protrusion 26d, even if the interlocking plate 26 does not move upward due to contact welding or the like even with the return force of the opening spring 29, the upward movement of the link 45 allows the protrusion 26d of the interlocking plate 26 to be moved in the recess 45a. By lifting it up, the interlocking plate 26 is forcibly moved upward to open and separate the contacts.

Therefore, when the movable iron core 7 is turned off, the interlocking plate 26
is pulled up with an impact, so contact welding is less likely to occur. Further, as shown in FIG. 5(b), a limit switch 122 is provided, and this limit switch 1
22 is for self-holding the electromagnet part 3 when the main contact is closed.

The electromagnet block A and the contact opening/closing mechanism section B are connected as follows. That is, the bottom surface of the body 23 is bored with a through part that penetrates the body 23 from top to bottom,
The connecting bottle 18 is vertically inserted into this penetrating portion, and one end 18a of the connecting bottle 18 is inserted into the hole 15a of the conversion shaft 11.
The other end 18b of the connecting pin 18 is inserted into the hole 47a of the arm piece 47 of the link 45, and the connecting pin 18 connects the conversion shaft 11 and the link 45. With these connection configurations, the horizontal movement of the electromagnet part 3 is converted into a vertical movement by the connecting pin 18, and the movement of the electromagnet part 3 is transmitted to the link 45. A terminal portion 70 on the load side is provided at one end of the mechanism housing portion 25 . The terminal portion 70 is composed of a terminal screw 70a, a clamping plate 70b, a terminal plate 70c, and the like. The tip of the terminal plate 70c and the short circuit coil 33
The other end of the short termination coil 33 and the upper end of the bimetal 39 are connected by an edit line 71, and the lower part of the bimetal 39 is connected to the movable contact 27 via an edit line 72. connected to the base.

Now, the earth leakage tripping device of the present invention is housed in the expansion storage section 20 on the side of the body 23 located above the expansion base 8.

That is, the above-mentioned earth leakage tripping block C is stored in the expansion storage part 20, and the coil 105 and the text switch 1 are
A circuit block 113 in which 11 circuits are housed below.
connected to. Further, bearings 11 are provided at the upper ends of both sides of one end of the expansion storage portion 20 in the distal direction of the plunger 107.
4, the rotation shaft 103b of the connecting link 103 is rotatably supported, and the lower end of the tripping drive body 103f is disposed opposite to the upper surface of the pushing piece 53c provided at one end of the latch engagement plate 53. In addition to connecting with the bridging piece 103c,
Insert the tip of one langeer 107 between 103d. In addition, the hooking piece 108c of the display button 108 of the above-mentioned earth leakage tripping block]C is a driver 60 that can protrude from the side of the handle 60.
It is arranged below the tip of the handle 60 and is connected to the rotation of the handle 60.

As shown in FIG. 5(b), a terminal portion 73 on the power supply side is provided on one side of the mechanism storage portion 25. The terminal portion 73 includes a terminal screw 73a, a clamping plate 73b, a terminal plate 73c, and the like. An arc horn 74 is provided on the upper surface of the terminal plate 73c.
is provided.

Further, a fixed contact 75 facing the movable contact 36 is fixed on the end of the terminal plate 73c. The arc extinguishing device 76 includes 2
It is composed of two side plates 77, a plurality of grid plates 78 arranged in parallel between the two side plates 77, insulating plates 121 located on the outside of the side plates 77, an insulating box 79 covering these, etc. . Here, both arc horns 38.74 are shown in Fig. 10 (
As shown in a), it is arranged in parallel with the grid plate 78 within the insulating box 79.

A cover 80 covering the upper surface of the body 23 is made of an insulating material,
A window hole 81 is bored approximately in the center of the handle 60 so that the operating portion 60d of the handle 60 protrudes from the top surface. Also, window hole 8
A display window 80a for displaying a display section 97b of the display piece 97 is provided on the side of the display panel 1. This display section 97b displays the on state, off state, tri-tube state, etc. of the main circuit. Further, on the cover 80 located above the expansion storage section 20, a display section 108 of a display button 108 labeled F is provided.
A hole 115 is provided into which the hole 115 is inserted so that it can be freely retracted and retracted. Further, a push button 118 is attached to the cover 80 so as to be freely pushable so as to correspond to the text switch 111 on the holding frame 104 of the earth leakage tripping block 102.

Further, notches 83 are formed at both ends of the cover 80, and each terminal portion 70.degree. 73 is positioned within the notches 83 as shown in FIG. Further, the mounting base 1, which houses the electromagnet block A and the like and connects the expansion base 8, is attached to the lower surface of the body 23 with assembly screws 84 as shown in FIG. It is fixed to the top surface with assembly screws 85. Here, the top surface of the electromagnet block A is insulated by the bottom of the body 23 made of an insulating material, but the connecting bottle 18 is connected to the body 23g from the electromagnet block A through the penetrating part of the body 23! It stands out □.

FIG. 8 shows an electric circuit diagram in which a series circuit including a shorting coil 33, a bimetal 39, a contact 36, 75, etc. is inserted between the terminal portions 70, 73. In addition, auxiliary terminal 2
A series circuit including a limit switch 99 that is not interlocked with the handle 60 and a limit switch 100 for alarm notification is connected between the auxiliary terminals 22 and 222. There is a warning lamp 1
23 are connected. In addition, auxiliary terminals 22+, 22
A limit switch 122 for self-holding is connected between
Lamps 125 for on-indication are connected to the auxiliary terminals 226, respectively. Furthermore, a switch SW for on operation is provided between the auxiliary terminals 22° and 226.

However, switches SW for OFF operation are connected between the auxiliary terminals 222 and 224, respectively. The features of this breaker are:
Even if the handle 60 is turned on, unless the operator operates the switch SW3, the contact 36.75 will not be turned on and the main circuit will not be energized. Then, when the switch SW is turned off or the handle 60 is turned off to turn off the limit switch 122, the power is cut off to the coil 5 of the electromagnet section 3 and the contact 36.
75 is opened and the main circuit is cut off. Further, the earth leakage detection circuit 116 is a circuit for amplifying the output of the zero-phase current transformer 112 and causing an excitation current to flow through the coil 105 of the electromagnetic solenoid 101, and is connected so that the operating power source is obtained from the load side.

Next, the operation of this breaker will be explained.

Figure 9 shows the AA sectional view of Figure 4, and Figure 10 shows the 3rd
A cross-sectional view taken along line BB in the figure is shown. Figures 9(a) and 10
Figure <a) shows the off state, Figure 9(b) and Figure 10(
b) shows the off state when the handle 60 is on and the electromagnet part 3 is off, FIGS. 9(c) and 10(c) show the on state, and FIGS. 9(d) and 10(c) show the on state. Figure 10<d) shows the toll knob condition.

First, in the OFF state shown in FIGS. 9 and 10 (a), the pressing piece 68 of the handle 60 presses the upper surface of the link 45 downward, and the protrusion 60e pushes the limit switch. 99 actuator 99a is pressed to turn off the nine contact points of the limit switch. By turning off this contact, the power to the electromagnet section 3 is cut off. A rotating shaft 50 that pivotally supports the link 45 and the latch plate 48 is located below the long hole 44 of the frame 41. Further, the contacts 36.75 of the main circuit are open. Next, Figure 9 (a
) from the off state to the handle 6 as shown in FIG. 9(c).
0 is turned on, the protrusion 60e of the handle 60 separates from the actuator 99a of the limit switch 99,
Limit switch 99 is turned on. Therefore, as shown in FIG. 6, power is applied to the lamp 124 to indicate that the handle 60 is on and the electromagnet 3 is off. Then, the switch S shown in FIG.
Turn on W3 to excite the coils of the electromagnet section 3. At the same time, the limit switch 122 is driven to switch internal contacts and perform self-holding. Therefore, even if the switch SW is released, the coil 5 continues to be excited. At this time, the lamp 125 lights up to indicate that it is in the on state. 9 and 10 by energizing the coil 5.
As shown in (c) of the figure, the movable core 7 is attracted to the fixed core 6. When the movable iron core 7 is attracted, the conversion shaft j1, which is connected to the movable iron core 7 and the U-shaped bottle 6, rotates clockwise about the shaft 13. It moves downward as it rotates. When the connecting bin 18 moves downward, the link 45 connected to the connecting bin 18 rotates counterclockwise about the rotating shaft 50.

Therefore, the interlocking plate 26 disposed below the link 45 is moved down in conjunction with the link 45 against the return force of the opening spring 29. When the interlocking plate 26 moves downward, since the movable contact 27 is located in the hole 26a of the interlocking plate 26 as shown in FIG. 10(c), the iJ moving contact f2-1 is moved downward and the movable contact The movable contact 36 of the child 27 and the fixed contact 75 are in contact with each other,
The main circuit will be energized. Here, contact pressure spring 28
Bilateral? i, 3 (l.

Appropriate contact pressure is applied between 75 and 1'L, 5. Now, if you turn off the electromagnetic section by operating switch SW, (b > t(-1
, O, L, the movable iron core returns to the left side of the diagram due to the return force of the subring 10. 6, 2, 1, 1, 8
Due to the movement of λ.1].'7, the conversion shaft 11 rotates clockwise at the center 44 of the shaft 13E, i-1. This counterclockwise rotation of the conversion shaft 11 moves the connecting bin 18 upward, causing the link 45 to rotate clockwise about the rotation shaft 50. Therefore, the interlocking plate 26 whose urging force by the link 45 has been released is moved upward by the return force of the opening spring 29, and the movable contact 27 is also moved upward, and the contacts 36.75 are opened and separated.

Next, when the handle 60 is turned off from the on position, the protrusion 60e of the handle 60 engages the actuator 9 of the limit switch 99, as shown in FIGS.
9a to turn off the internal contact. Therefore, when the limit switch 99 is turned off, the power supply to the electromagnet section 3 is completely cut off, and the electromagnet section 3 returns to the initial position in the same manner as described above.

In addition, when off, Fig. 10 (a> and Fig. 6 (a)
As shown in >, the interlocking plate 26, which is urged upward by the opening spring 29, hits the lower surface of the yoke 32 and stops;
After this, the electromagnet part 3 returns to its original state, and the link 45 further rotates via the connecting pin 18. After that, the link 45 contacts the projection part 26d of the interlocking plate 26, and from then on, the link 45 rotates around the vicinity of the contact point. Link 45 rotates. By rotating the latch plate 48 via the rotation shaft 50 by the rotation of the link 45, the engagement recess 58 of the latch plate 48 is moved into the latch engagement plate 5.
The latch engagement with the engaging piece 57 of No. 3 can be performed more reliably, and therefore, a recess throat margin can be reliably secured, mis-trips can be eliminated, and operational reliability can be improved.

Here, the link 45 that drives the 5 interlocking plate 26 is the latch plate 4.
8 and the rotating shaft 50, and this latch plate 48
Since the end opposite to the connecting pin 8 is connected to the electromagnet part 3 side, the latch part (the engaging piece) between the latch plate 48 and the latch engagement plate 53 is 57 and the engagement recess 58 do not move, stable operation without mistrips can be obtained.In other words, since the latch does not come off when the latch is in the on/off state, if an abnormal condition occurs, , the tripping operation can be performed reliably.Furthermore, since all the members attached to the frame 41 are connected via a bottle during on/off, a long life can be expected.

Next, the case of tri-tub state will be explained. First, the case where the main circuit is short-circuited will be explained. When the main circuit is short-circuited, a large current flows, so that an electromagnetic force is generated in the short-circuit coil 33, causing a trip operation.

Here, in a normal state before a short circuit occurs, the ninth
As shown in FIG. 4C, the rotating shaft 50 that pivotally supports the link 45 and the latch plate 48 is located at the lower part of the elongated hole 44 of the frame 41. The latch plate 48 is engaged with the engagement piece 57 of the latch engagement plate 53. Further, the engagement portion 56 of the latch engagement plate 53 is connected to the drive bin 3 as shown in FIG. 10(c).
The head portion 34a of No. 4 is engaged with the head portion 34a of No. 4.

As shown in FIGS. 9 and 10 (d), when a short circuit occurs, the electromagnetic force generated in the short circuit coil 33 causes the drive bin 3 to
4 is sucked and driven downward. This downward movement of the drive bin 34 presses the engagement portion 56, and the latch engagement plate 53 rotates counterclockwise about the bin 55. Then, the latch plate 48 becomes free due to the disengagement between the engagement piece 57 of the latch engagement plate 53 and the engagement recess 58 of the latch plate 48, and the link 45 is moved to the interlocking plate 26 by the return force of the opening spring 29.
The rotating shaft 50 of the link 45 moves to the upper end of the elongated hole 44 of the frame 41.

At this time, the latch plate 48 rotates clockwise around the shaft 41b as a fulcrum due to the return force of the spring 95, and the protrusion 4
8d is the actuator 100 of the limit switch 100
A is pressed to switch the contacts, light up the alarm lamp 123 to indicate the trip state, and cut off the power to the coil 5 of the electromagnet section 3. Therefore, when the downward urging force of the interlocking plate 26 is released, the movable contact 27 also moves upward, and the contacts 36.75 are opened and separated.

Further, at the time of tripping, since the notch hole 49a of the latch plate 48 connected to the link 45 is opened at the end side, the opening operation of the link 45 is accelerated. That is,
When the periphery of the notch hole 49a is closed, the four links and the latch plate 48 move in conjunction with each other until the opening is completed, so that the opening behavior of the interlocking plate 26 is also restricted, and the mechanical The delay time will be longer. However, since the end of the notch hole 49a on the link 45 side is open as described above, the link 45 and the latch plate 48 interlock with each other halfway during tripping, but at a certain point the rotating shaft 50 latches. Since the link 45 protrudes from the cutout hole 49a of the plate 48 and moves separated from the latch plate 48, the movement of the link 45 becomes faster, thereby reducing the mechanical delay time and improving the opening characteristics. It is something.

In addition, at the time of tripping, the power supply to the coil 5 is cut off, so the movable core 7 also tries to return, but when the movable core 7 returns a little, the connecting bin 18 tries to move upward by the conversion shaft 11, but the link Contact piece 47 protruding from the tip of 45
b is the wall surface 23b of the protrusion 23a formed on the body 23
When this happens, upward movement of the connecting bin 18 is prevented.

In other words, in normal on/off state, the link 45 is connected to the rotating shaft 5.
Since it rotates around 0, the wall surface 2 of the protrusion 23a
3b, but in the tripped state, the link 45 receives a return force from the electromagnet 3, and the link 45 is moved between the rotating shaft 50 on one side and the side edge of the elongated hole 44 on the frame 41, and the other The link 45 is held between a part of the link 45 and the wall surface 23b of the protrusion 23a, and the upward movement of the link 45 is prevented. Therefore, one end of the link 45, which is prevented from moving upward, is moved to the lower end of the elongated hole 44 by the push contact piece 68 of the handle 60, and the setting can only be performed by manual operation of the handle 60. , it is safe because remote reset by only the electromagnet part 3 can be reliably prevented.

Also, when an overcurrent flows, the bimetal 39 bends,
As shown in FIGS. 9 and 10 (d), the screw 40 attached to the tip of the bimetal 39 presses against the back surface of the drive piece 89 and rotates it, and the rotation of the drive piece 89 causes the latch engagement plate 53 to be rotated. is rotated counterclockwise about the shaft 41b to release the engagement of the retaining piece 57 with the latch plate 48. As a result of this release, the link 45 moves upward as in the previous case, the biasing force on the interlocking plate 26 is released, and the contact point 36.75 moves to rI.
It will be extremely difficult.

Next, after the trip operation, when the handle 60 is in the on position, look at the display on the display section 97b of the display piece 97, and then
0 as shown in FIGS. 9 and 10 (a), position the link 45 etc. downward with the push piece 68 of the handle 60, and rotate the latch plate 48 counterclockwise. Then, the engagement recess 58 of the latch plate 48 and the engagement piece 57 of the latch engagement plate 53 can be engaged and reset.

Therefore, by providing the pressing piece 68 on the handle 60, manual reset can be easily performed.

The display piece 97 rotates around the handle shaft 61 independently of the handle 60, and the position of the display portion 97b is varied depending on the inclination of the link 45. That is, as shown in FIGS. 9 and 10, since the inclination of the link 45 differs depending on the on state, off state, trip state, etc., the link 45 is rotated by the connecting bin 98 according to the inclination, and the display window 80a
It is now more visible.

By the way, the operation of the earth leakage tripping device is as follows.

First, when the contact opening/closing mechanism part B is closed, the first
As shown in FIG. 1(a), the plunger 107 of the earth leakage tripping block 102 is urged by the return spring 109 and moves toward the tip as shown in FIG. 11(b). As shown in g(c), press the bridging piece 103d of the connecting link 103 forward, and
In FIG. It is in contact with the hanging wall.

In this state, the driver 50c of the handle 60 and the display button 1
At this time, the upper surface of the display section 108a formed at the upper end of the display button 108 is in contact with the upper surface of the cover 80 and the road surface.

Now, even if the connecting link 103 tries to rotate clockwise due to vibration or impact in this contact open state, the clockwise rotation of the connecting link 103 is restricted by the pressing force of the plunger 107 against the bridging piece 103d. Ru.

Next, when a leakage current is detected by the leakage detection circuit 116 and the coil 105 of the electromagnetic solenoid 101 is excited, the plunger 107 is pulled in and moved to the right as shown in FIG. 12(b), and the tip of the plunger 107 is caught. Bin 107b
pushes and drives the driving piece 103e of the connecting link 103 as shown in FIG. 12(c), and pulls it out by rotation to rotate the connecting link 103 clockwise as shown in FIG. 12(a). The lower end of the driver 103f pushes the pushing piece 53c of the latch engagement plate 53, releases the latch state of the latch engagement plate 53, trips the contact opening/closing mechanism part B in the same way as the tripping operation described above, and opens the contact. I do. On the other hand, as the plunger 107 moves, the notch 107a formed at the lower edge of the plunger 107 is cut into the through hole 1 of the display button 108.
08b, the display button 108 is moved upward by the spring force of the return spring 110, and the through hole 1 of the display button 108 is moved upward by the spring force of the return spring 110.
The periphery of the notch 107a is held in contact with the periphery of the notch 107a, and the upward movement of the display button 108 is maintained to expose the display portion 108a outside the cover 80 to perform S-electronic display.

When the contact is opened, no excitation current flows to the coil 105, but the plunger 107 is held in a retracted state by being engaged with the display button 108 described above.

When the handle 60 is reset from this state to the contact closed state, the driver 60c provided on the handle 60 engages with the hook 108c and pushes down, and when the display button 108 is moved downward, the plunger 107 When the engagement between the notch 107a and the periphery of the through hole 108b of the display button 108 is released, the spring force of the return spring 109 causes the plunger 107 to return to its original state as shown in FIG.

[Effects of the Invention] As described above, the present invention includes an electromagnetic solenoid that is excited by the detection output of an earth leakage detection circuit, and a rear part of the electromagnetic solenoid that is inserted into the center through hole of the coil so that the rear part of the electromagnetic solenoid is inserted into the coil when the electromagnetic solenoid is excited. The 7-lunger is pulled in and moved and is spring-biased toward the tip when not energized, and is rotatably supported on the breaker body. A connecting link that drives the latch removal member of the trip mechanism in the latch removal direction,
The connecting link includes a drive piece that is pushed and driven by the tip of the plunger when the plunger is retracted to apply rotational force in the latch removal direction, and a drive piece that is pushed by the tip of the plunger that is normally biased by a spring to apply rotational force to the drive piece. I11! Even if a rotational force is applied to the connecting link in the latch removal direction due to vibration, the tip of the spring-biased plunger pushes the pressing piece, and the rotational force is applied in the anti-latch removal direction. Because of this, the connecting link does not rotate in the latch release direction, which prevents the earth leakage breaker from malfunctioning due to shock, vibration, etc. Furthermore, when the 1 lange is retracted when detecting an earth leakage, the connecting link does not rotate in the latch release direction. A rotational force can be applied to the latch in the latch removal direction, and the latch removal operation is not affected by the above-mentioned malfunction prevention mechanism.

[Brief explanation of the drawing]

Section 1 is an exploded perspective view of the embodiment of the present invention, FIG. 2 is an exploded perspective view of the earth leakage tripping block as above, FIG. 3 is an explanatory diagram of the relationship between the plunger and the connecting link as above, and FIG. 4 is as above. 5(a) is a reduced exploded perspective view of the breaker used in the above, FIG. 5(b) is a reduced exploded perspective view of the breaker used in the above, and FIG. 6(a) is a reduced exploded perspective view of the breaker used in the above. FIG. 6(b) is an exploded perspective view of the breaker, FIG. 7 is a cross-sectional view of the main parts of the breaker, FIG. 8 is an electric circuit diagram of the breaker, and FIG. 9 is an exploded perspective view of the breaker. 4 is a reduced cross-sectional view of FIG. 4 of the embodiment of the invention, where (a) is a cross-sectional view in the OFF state, and <b) is a cross-sectional view when the electromagnet section is in the OFF state. (C) is a cross-sectional view of the on state;
d) is a sectional view of the tripped state, FIG. 10 is a reduced sectional view taken along line A-A in FIG. 11 and 12 are explanatory diagrams of the earth leakage tripping operation, FIG. 13 is an explanatory diagram of a conventional example. 101 is an electromagnetic solenoid, 103 is a connecting link, 103
a is the link body, 103b is the rotation axis, 103c, 103
d is a bridge piece, 103e is a drive piece, 103f is a tripping drive body, 104 is a holding frame, 105 is a coil, 106 is a yoke, 107 is a plunger, 108 is a display button, 109.11
0 is a return spring, and C is an earth leakage tripping block. Agent Patent Attorney Ishi 1) Long 7 103 is the connecting link 103a, the link body 103b is the rotating shaft 103c, 103d is the bridging piece 103e, the driving piece 103f is the tripping drive body, Fig. 3, Fig. 6, Fig. 11 (C ) Weighing: = Shikin =) Figure 12 (C)

Claims (1)

[Claims] (1) An electromagnetic solenoid is excited by the detection output of the earth leakage detection circuit, and its rear part is inserted into the center through hole of the coil of the electromagnetic solenoid, and when the electromagnetic solenoid is energized, it is drawn backward into the coil and moves, and when it is not energized, it moves. The plunger is biased toward the tip by a spring, and when the plunger is rotatably supported on the breaker body, when the plunger is pulled in, it is pushed and driven by the tip of the plunger and rotates to latch and pull the latch release member of the breaker trip mechanism. A connecting link that is driven in the latch releasing direction, and the connecting link includes a driving piece that is pushed and driven by the tip of the plunger when the plunger is retracted to apply rotational force in the latch removing direction, and a spring that normally acts. 1. An earth leakage tripping device for an earth leakage breaker, comprising a pressing piece that is pushed by the tip of an energized plunger to apply a rotational force in the opposite direction to the rotational force applied to the drive piece.