JPS6325649Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is an earth leakage or disconnector (generally referred to as an earth leakage or disconnector dedicated to earth leakage protection) that automatically shuts off the circuit when an earth leakage occurs in the circuit. ) or, in addition to the above functions, an earth leakage or disconnector that automatically shuts off the circuit even when an overcurrent flows through the circuit (generally an earth leakage or disconnector that also serves as overload and short circuit protection). It also relates to the improvement of circuit breakers and cut-off mechanisms, such as wiring cutters and disconnectors, which automatically cut off the circuit when an overcurrent flows.

Conventionally, when a trip bar, which is a tripping member for this type of circuit or disconnector, is to be incorporated into an opening/closing mechanism, holes are drilled in both side plates of the frame that pivotally supports the opening/closing mechanism, and the trip bar is pivotally supported in these holes. was.

In this case, there were disadvantages such as not only complicated frame molding but also extremely troublesome work to assemble the trip bar.

This invention has been made in view of these points, and is intended to provide a circuit and disconnector with a simplified frame shape and in which a trip bar can be installed quickly and easily.

An embodiment of this invention shown in FIGS. 1 to 11 will be described below. That is, in FIG.
Reference numeral 101 denotes an earth leakage/disconnection vessel, which is composed of a base 1 and a cover 2, both of which are molded from synthetic resin. As shown in FIG. 2, parts are assembled into the base 1, which are roughly divided into parts A and B.

First, part A will be explained. Reference numeral 102 denotes a terminal device on the power supply side, which includes a box-shaped terminal fitting 4 onto which a terminal screw 3 is screwed, and a terminal board 5 with one end inserted into the terminal fitting 4.
A fixed contact 6 is caulked to the other end of the terminal plate 5. Terminal board 5 is cover 2
It is fixed by the convex portion 2a of the holder so that it is almost pressed. 7
is a holding plate, one end of which is fixed to the base 1 with a tightening screw 8. Reference numeral 9 denotes a movable element, one end of which is firmly fixed to the holding plate 7 by welding, and a movable contact 10 crimped to the other end at a position opposite to the fixed contact 6. This movable element 9 is made of a thin plate with elasticity and good conductivity, and the opening/closing mechanism section 10 described below
3 is in the open position, the fixed contact 6 and the movable contact 1
0 so that there is a predetermined gap between the movable contact 1 and
It holds 0. This example shows a three-pole wire breaker, and the cross section taken along line CC (left pole) in Figure 1 is shown in Figure 3, and the cross section taken along line D-D (center pole) is shown in Figure 3. A cross-section is shown in Figure 4, and a cross-section taken along the E-E line (right side) is shown in Figure 5.
As shown in FIG. 2, an opening/closing mechanism section 103 is provided approximately at the center of portion A. This opening/closing mechanism section 103 is disassembled and the state of the parts is shown in FIG. 7. Reference numeral 11 is a handle molded from synthetic resin, which is pivotally supported approximately at the center by a handle pin 12.
As shown in FIG. 4, one end thereof protrudes from the window hole 2b of the cover 2 and is used for opening/closing the breaker.
Further, a hole 11a is provided at the other end. 13
is a frame, which includes both side plates 13a and mounting plates 13 each bent into a substantially L-shape from the lower ends of the both side plates.
b, a handle pin 12 is supported, and a handle 11 is installed between both side plates 13a. 13c is a stop portion, 14 is both mounting plates 13b mentioned above.
The base 1 is screwed into the base 1 by fixing screws 25 through screw holes respectively provided in the base 1. 15 is both side plates 13
The elongated hole 16 provided in a is a U-shaped link, and the upper arm 16a is inserted into the hole 11a of the handle 11, and the lower arm 16b is inserted into the elongated hole 15. 1
Reference numeral 7 denotes a lever, which is disposed between both side plates 13a, and whose central hole 17a is pivotally supported by the lower arm 16b of the U-shaped link 16. Reference numeral 18 denotes a plate-shaped link, which is provided with a pair of holes 18a, each of which has an upper arm 16a and a lower arm 16b of the U-shaped link 16.
It serves as mechanical reinforcement for the U-shaped link 16. Therefore, when the handle 11 is rotated left and right, the hole 11a rotates up and down about the handle pin 12, so the lower arm 16b of the U-shaped link 16 supported by the hole 11a rotates through the elongated hole 15. It moves up and down, and the lever 17 also moves up and down accordingly.
Reference numeral 19 denotes a handle spring, which is pivotally supported by the handle pin 12. One leg 19a is hooked on the upper arm 16a of the U-shaped link 16, and the other leg 19b is hooked on the wall 1a of the base 1, so that the handle 11 is always held. It is biased clockwise. Reference numeral 20 denotes a presser plate made of synthetic resin, and left, middle, and right movable elements 9 are arranged in the grooves of 20a, 20b, and 20c, respectively, and the movable elements 9 of each pole are operated simultaneously. This presser plate 20 slides in a vertical groove 1c formed in the partition wall 1b of the base 1, and has a tip 20d which is pressed by the abdomen 17b of the lever 17. 20e is a convex portion located above the groove portion 20c, and has a slope 20f on the load side. This convex portion 20e is related to the operation of an earth leakage member, which will be described later. Also, 20g is the arm part, and the groove part 20 for the right pole.
It is located in an extended position on the c side.

Reference numeral 21 denotes a trip bar which is a tripping member molded from synthetic resin, in which support shafts 21a protruding from both sides of the lower part are pivotally supported by a pair of U grooves 1d provided in the base 1, and both of the above-mentioned Support shaft 21a
It is prevented from coming off by a mounting plate 13b of the frame 13 located above the frame 13. The upper part is plate-shaped with left and right poles, and there are 2 screw holes at the positions corresponding to the left and right poles.
1b is open. Reference numeral 21c denotes a receiver stage located approximately in the center of the trip bar, on which the rear end 17c of the lever 17 rests when the shredder is turned on. Reference numeral 21d denotes a stopper which is stopped at the back of the frame 13 so that the engagement distance between the rear end 17c of the lever and the receiving stage 21c is in a predetermined state when the cutter is turned on. Reference numeral 21e denotes a kicking arm, which is related to tripping in the event of an electrical leak, which will be described later. 21f is a hanging part projecting downward, 22 is a trip bar spring, the shaft 21a is inserted into the spring part, and one end 22a is attached to the side of the hole 1e of the base 1.
The other end 22b is locked to the back of the trip bar 21,
The trip bar 21 is always urged counterclockwise. The trip bar 21 is assembled into the base 1 in the eighth step, and as is clear from the figure, the trip bar 21 is attached to the trip bar spring 22.
Since the upper part is biased counterclockwise around the shaft 21a, the upper part is tilted to the left, the lower part is rotated to the right, and the latching part 21f is latched to the stepped part 1f of the base 1. . Therefore, even if the trip bar 21 is left in this state during assembly, it will not easily fall off, but if the hook part 21f is not present, it will easily fall off. Next, when assembling the frame 13, its back and trip bar 2
The stopper 21d of 1 comes into contact with the trip bar 2
1 is in an almost vertical state, with the hooking part 21f and the step part 1f
becomes free.

Reference numeral 90 denotes a presser spring, which is installed under the presser plate 20 in the base vertical groove 1c located between each pole.
The presser plate 20 is always urged in the opening direction. Note that the right-hand movable element is the movable element 9 as shown in FIG.
A plate spring 23 formed in a substantially Z-shape is installed on the top. The lower arm 23a of this plate spring 23 is caulked together when the movable contact 10 is caulked to the movable element 9, and the middle arm 23b corresponds to the slope 20f of the convex portion 20e of the presser plate 20, and the upper arm 2
3c corresponds to an earth leakage member to be described later. Reference numeral 24 denotes an internal electric wire, one end of which is firmly fixed to the movable element 9 at a position opposite to the contact point by welding. The other end extends to the load side terminal. The above is the opening/closing mechanism for leakage and disconnection.

Next, portion B in FIG. 2 will be explained.
104 is a load side terminal device, which is a power source side terminal device 10.
It has a similar structure to that of No. 2, and consists of a box-shaped terminal fitting 4 onto which a terminal screw 3 is screwed, and a terminal plate 26 with one end inserted into the terminal fitting 4. The internal electric wire 24 described above is fixed to the inner end of each electrode terminal plate 26. 27 is a zero-phase current transformer, and the above-mentioned internal electric wire 24 is passed through a through hole in the center thereof. Reference numeral 28 denotes a secondary output lead wire of the zero-phase current transformer, and when a zero-sequence current flows between the internal wires 24 of each phase during a current leakage, a secondary output is induced in the secondary output lead wire 28. 29
is an amplifier that amplifies the secondary output, and is composed of a large number of electronic circuit components. 30 is an electromagnet device, which is composed of parts as shown in FIG. That is, a bobbin 31 made of synthetic resin, a coil 32 wound around the bobbin, a yoke 33 formed into a substantially U-shape, an iron plunger 34 made from a round bar cut into small pieces, a non-magnetic rod 35, and a rod spring 36. Become. Reference numeral 100 denotes an earth leakage display device, which is composed of a display button 37 and a display spring 38 molded from synthetic resin.
Reference numeral 39 denotes a test switch device for turning on and off the power of the electromagnet device 30, and is composed of a test spring 40 made of a phosphor bronze plate having good elasticity and a test resistor 41. These zero-phase current transformer 27, amplifier 29, electromagnet device 3
0, Earth leakage display device 100 test switch device 39
is installed in a case 42, which is a support body made of synthetic resin, and is configured as one unit.

Next, the operation of this leakage and disconnection will be explained. FIGS. 3 and 4 show an open state. To close the pole, when the handle 11 is rotated counterclockwise in the figure, the hole 11a is also reversed, and the lower arm 16b of the link 16 moves downward within the elongated hole 15 of the frame 13. Along with this, lower arm 1
The lever 17 supported by the lever 6b also moves downward, but first the rear end 17c of the lever 17 is stopped by the receiving step 21c of the trip bar 21, and when the lower arm 16b further descends, the abdomen 17b touches the tip 20d of the presser plate 20. By pressing, the entire holding plate 20 is lowered, and the movable element 9 finally joins the movable contact 10 and the fixed contact 6. At this time, upper arm 1 of link 16
6a is the stop portion 13c of the frame body 13 at a position on the right side of the line connecting the handle pin 12 and the lower arm 16b.
It is then positioned and maintained in a closed state.
To open the circuit from the closed state shown in FIG. 6, flip the handle 11 to the right as shown in FIG. is pulled upward, and the pressing spring 90 moves the presser plate 20 and the mover 9 upward, thereby opening the movable contact 10 and the fixed contact 6.

As described above, this invention has advantages such as simplifying the shape of the frame and making it possible to simply and easily incorporate the trip bar.

[Brief explanation of the drawing]

Figures 1 to 10 show an embodiment of this invention, with Figure 1 being a top view, Figure 2 being a top view with the cover removed, and Figure 3 being the first embodiment showing the open state. 4 is a sectional view taken along line C-C in the figure, FIG. 4 is a sectional view taken along line DD in the same figure showing an open state, FIG. 5 is a sectional view taken along line E-E in the same figure showing an open state, and FIG. 7 is an exploded perspective view of the opening/closing mechanism and the tripping member, FIG. 8 is an explanatory diagram of the assembly of the trip bar and base, which are the tripping members, and FIG.
The figure is an enlarged perspective view of the right pole mover, and FIG. 10 is an exploded perspective view of the electromagnet device and the leakage indicator device. In the figure, 103 is an opening/closing mechanism, 21 is a trip bar, 21a is a support shaft, 1 is a base, 1d is a U axis, 1
3 is a frame, and 13b is a mounting plate. Note that the same reference numerals in the figures indicate the same parts.

Claims (1)

[Scope of utility model registration request] A circuit comprising a fault current detection element, a trippingly operable opening/closing mechanism section that controls energization of the main circuit, and a trip bar that receives the output of the fault current detection element and removably engages with the opening/closing mechanism section. The breaker includes a support shaft protruding from both sides of the trip bar, a base having a locking groove to which the support shaft is pivoted, a frame fixed to the base and supporting the opening/closing mechanism, and the support shaft projecting from both sides of the trip bar. A circuit breaker characterized in that a mounting plate is integrally molded into a frame and prevents the support shaft from coming off.