JPS5850589Y2 - Recessed circuit breaker - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a recessed circuit breaker.

Conventionally, circuit breakers have been unconstitutionally mounted on walls, and the power supply and load cords are connected using terminal screws, or a plug protruding from the circuit breaker body is inserted into a power outlet to connect the load to the wall. Types with plugs and outlets that can be connected by inserting a plug are available.

The former type allows for reliable wall mounting, but the cord connection process is troublesome, while the latter type allows for easy electrical connection, but the breaker body may fall off from the power outlet. It has the disadvantage of being easy.

Therefore, it is conceivable to embed the circuit breaker body into the unconstitutional outlet installation opening and provide an insertion hole in the front part for inserting the load plug, but in this case, the outlet installation opening is When the circuit breaker body is stored, there is almost no remaining space, and the power cord connected to the power terminal comes into contact with the metal box fitted inside the outlet installation opening, causing the insulation to deteriorate. There was a problem.

In addition, power terminals of circuit breakers have recently been provided with fixed contacts for opening and closing the main circuit, but when the fixed contact and the movable contact are opened, that is, when the circuit is In order to prevent contacts from welding, an extremely large pulling force was required, and the power terminal had to be firmly fixed to the casing.

The present invention was created in view of the above problems, and allows the power terminal and power cord to be easily connected even in a small space.
It is an object of the present invention to provide an embedded circuit breaker which has good insulation properties and whose power supply terminal does not rattle even after a large number of tripping operations.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

The drawing shows an embedded earth leakage breaker, in which 1 is a case made of synthetic resin, 5 is a plate made of synthetic resin with a cover part 6 integrally provided, and this plate 5 has a rectangular long hole 7 and a circular hole. 8, a plug insertion hole 9, and a mounting screw insertion hole 10.10.

The case 1 and the plate 5 are fitted together to form a casing, and a tripping mechanism, an electromagnet 42, a zero-phase current transformer 47, etc. are housed inside the casing.

The tripping mechanism is composed of a closing operation knob 13, a metal frame 17, a U-shaped arm 20, and a protrusion 44 of an armature 43 below a lever 21.

The operating knob 13 has a support shaft 14 rotatably attached to a frame 17, and is biased by a return spring 15 in the direction around the support shaft 14 in FIG. 3.

One end of an arm 20 is rotatably inserted into the eccentric position of the operating knob 13, and the other end of the arm 20 is movable along the elongated hole 18 of the frame 17, and a lever 21 is attached to the other end. It is pivotally supported so that it can swing freely.

Note that the knob portion 16 of the operating knob 13 protrudes from the elongated hole 7 of the plate 5.

23 is a sliding plate made of an insulating material that can move up and down along the vertical groove 2 provided in the case 1, and has a notch 24 in the center that is open at the bottom, and square holes 25 and 25 in both sides. have.

A return spring 26 is loosely fitted into the notch 24, and the sliding plate 2
3 is pushed upward in FIG. 3 by the return spring 26, and the upper limit position is regulated by the projection 19 of the frame 17.

A notch 28 of a movable piece 27 is fitted into the square hole 25 of the sliding plate 23 so as to be movable up and down, and a contact spring 29 is interposed between the upper surface of the movable piece 27 and the upper end of the square hole 25 so that the movable piece 27 is movable. Piece 27 is sliding plate 2
It is attached to 3.

The movable piece 27 has a movable contact 30 on the lower surface of the tip, a main circuit conductor 31 is connected to the base end of one movable piece 27, and a main circuit conductor 31 is connected to the base end of the other movable piece 27. 31 and a test circuit lead wire 32 are connected.

34. 34 is a substantially U-shaped power terminal that is fitted into the terminal mounting portion 3 of the case 1 from the left side in FIG. It is partitioned off by a barrier 3a protruding from 3.

A fixed contact 35 is provided at one end of the power supply terminal 34, and the movable contact 30 of the movable piece 27 contacts and separates from the fixed contact 35 to open and close the main circuit.

Further, the other end of the power terminal 34 is exposed on the back side of the case 1, and a power cord 51 (see FIG. 6) is connected to this other end with a terminal screw 36.

Note that 37 is a nut embedded in the terminal mounting portion 3, and is adapted to be screwed into the terminal screw 36 described above.

39. 39 is a load terminal which also serves as a plug blade holder, and is installed by fitting into the recesses 4, 4 of the case 1, and the load plug 52 (see Fig. 6) is inserted into the insertion 'JL9 of the plate 5. This makes it possible to electrically connect to the load terminal 39.

Note that the main circuit conducting wire 31 is connected to one load terminal 39, and the main circuit conducting wire 31 and a control circuit lead wire (not shown) are connected to the other load terminal 39.

The electromagnet 42 is fixed to the frame 17 and the armature 43
is rotatably supported by the frame 17, and biased in the direction around the window in FIG. 3 by a return spring (not shown).

A triangular projection 44 is provided on the back surface of the armature 43, and this projection 44 can be engaged with one end of the lever 21.

Reference numeral 46 denotes a control circuit configured by mounting suitable transformers, diodes, capacitors, etc. on a printed circuit board (not shown), which detects a sudden change in the magnetic field of the zero-phase current transformer 47, amplifies it, and excites the electromagnet 42. It looks like this.

Reference numeral 48 denotes a test circuit contact, which is closed by pressing a test button 49 protruding from the circular hole 8 of the plate 5, and excites the electromagnet 42 via the control circuit 46.

Here, a method for installing the earth leakage breaker having the above configuration will be explained.

First, as shown in FIG. 6, a box 54 is embedded in a recess 53 for installing an outlet provided in an unconstitutional wall, and a power cord 51 is introduced into the box 54.

Next, the power cord 54 is connected to the power terminal 34, an earth leakage breaker is embedded in the box 54, and the recess 53 is closed with the plate 5.

When connecting the power cord 54 to the power terminal 34, since the other end of the power terminal 34 having the terminal screw 36 is provided along the back surface of the case 1, the cord 54 also connects to the case 1.
There is little fear that the cord 54 will come into contact with the box 54, and the cord 54 will not be forcibly bent.

Then, attach the mounting screws 55 and 55 to the insertion hole 1 of the plate 5.
0.10 screws to both ends of the box 54,
Complete the earth leakage breaker installation work.

Although FIG. 6 shows a method of installing an earth leakage breaker on a concrete wall or earthen wall using the box 54, the plate 5 can also be attached to a panel wall in the case of a so-called panel wall that does not use the box 54. It can be installed similarly by

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

First, press the operating knob 13 in the state shown in FIG.
When the lever 21.5 is rotated counterclockwise against the arm 20, the lever 21. is pushed down.

Along with this, the sliding plate 23 that engages with the lever 21 is also pushed down, and the movable piece 27 descends together with the sliding plate 23.

The movable contact 30 of the movable piece 27 abuts the fixed contact 35 and the contact spring 29 is compressed, so that only the sliding plate 23 descends, and one end of the lever 21 touches the protrusion 44 of the armature 43.
It engages with the holder to stop its descent and is held in that position.

In this state, the main circuit is closed and the load circuit is energized (
(See Figures 4 and 5).

When a current leak occurs in the load circuit, the electromagnet 42 is excited by the action of the zero-phase current transformer 470, and the armature 43 is attracted to the iron core and rotates in the clockwise direction in FIG.

As a result, the lever 21 is disengaged from the protrusion 44 of the armature 43, and until then the sliding plate 2 is moved against the return spring 26.
In order to release the pressing force that was pushing down the sliding plate 23
moves upward, and at the same time the movable piece 27 also moves upward, contact 30.35
opens and the main circuit is instantly cut off.

When the cutoff current is large, a large upward pulling force acts on the power supply terminal 34, but since the power supply terminal 34 has a U-shape and is fitted onto the upper and lower surfaces of the terminal mounting portion 3, the power supply terminal 34 is No rattling and prevents contact welding.

Thereafter, the operating knob 13 is rotated clockwise by the return spring 15, and the lever 21 is raised via the arm 20, resulting in the state shown in FIG.

The embedded circuit breaker according to the present invention is not limited to an earth leakage breaker, but may also be a molded circuit breaker that detects an overload or short circuit and automatically interrupts an electric circuit.

Further, the plate is not limited to being integrated with the cover constituting the casing, and may be provided separately, for example, as a metal plate.

However, if it is integrated, it is easy to assemble, and the fixation strength in the embedded state is also high.

Further, in the above embodiment, a nut is embedded in the case and the terminal screw is screwed into the nut, but instead of the nut, for example, the power terminal may be directly burred to provide a female thread.

As is clear from the above explanation, according to the present invention, the case is provided with a terminal mounting part with an opening on the side, a U-shaped power supply terminal is externally fitted into this terminal mounting part, and the back surface of this terminal is attached to the protrusion of the plate. Since the power terminal is supported and fixed with one piece, the power terminal can be easily fixed without providing a separate fixing means, and the terminal is positioned vertically in the terminal mounting part so that it does not wobble even when removed many times. Never.

In addition, the other end of the power terminal extends along the outer surface of the case, so even if the space between the inner surface of the embedded box and the outer surface of the circuit breaker is small, the power cord can be accommodated compactly and insulation is maintained. In addition to being able to secure the power supply, it also becomes easy to connect the power cord and the power terminal.

Further, since the opening of the terminal mounting portion is closed with a protrusion, complete insulation is ensured between the power cord and the inside of the circuit breaker.

[Brief explanation of the drawing]

The drawing shows an example of the embedded circuit breaker according to the present invention,
Fig. 1 is a schematic exploded perspective view of the case, plate, and power terminal, Fig. 2 is a plan view with the plate removed when the main circuit is open, Fig. 3 is a sectional view taken along line A-A in Fig. 2, Figure 4 is a sectional view taken along line A-A in Figure 2 when the main circuit is closed;
The figure is a partial perspective view when the main circuit is closed, and FIG. 6 is a sectional view of the device in use. 1... Case, 3... Terminal mounting part, 5
...Plate, 6...Part of the cover, 9.
...Plug insertion hole, 10...Mounting screw insertion hole, 11...Protrusion piece, 13...Operation knob, 27... Movable piece, 30...Movable contact, 34...Power terminal, 35...Fixed contact, 36...Terminal screw, 39...
Load terminal, 42... Electromagnet, 47...
Zero-phase current transformer, 53...Recess for installing outlet (
Aperture).

Claims (1)

[Scope of utility model registration request] A plate that is larger than the outline of the casing and that exposes the input operating member and the plug insertion hole leading to the load terminal is provided on the front side of the casing that houses the tripping mechanism, opening/closing mechanism, etc. In a recessed type circuit breaker which is embedded in an opening for installing an outlet provided in the casing and is configured to close the opening with the plate, a terminal installation part with a side opening is formed in the side part of the casing, and this A roughly U-shaped power terminal is fitted from the side into the terminal mounting part, a terminal screw is provided at one end of the power terminal that is exposed on the back side of the casing, and a fixed contact is provided at the other end that protrudes into the casing. , an embedded circuit breaker in which the back side of the power terminal is supported and fixed by a protrusion protruding from a plate to close the opening of the terminal mounting part.