JP2524071Y2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a circuit breaker that performs a circuit break by an electromagnet device in response to an abnormal current such as an overload current or a short-circuit current.

[Conventional technology]

In general, this type of circuit breaker has a base made of thermosetting synthetic resin, which opens and closes contacts in response to an operation handle, and forcibly closes contacts by driving a trip plate. An opening / closing mechanism and an oil dashpot type electromagnet device that drives an armature in response to an abnormal current such as an overload current or a short-circuit current are inserted into a fitting groove formed in a base, and the opening / closing mechanism and an electromagnet are mounted. By pressing in each fixing piece of the device, the armature is fixed facing the release plate, and a cover made of thermosetting synthetic resin is attached to this base with mounting screws. there were.

[Problems to be solved by the invention]

However, in the above-described circuit breaker, since the switching mechanism and the electromagnet device are press-fitted into the pedestal, the switching mechanism and the electromagnet device are set according to the degree of press-fitting or the fitting depth. And the distance between the armature and the trip plate changes, which may cause variations in operation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a circuit breaker in which a change in a distance between an armature and a tripping plate facing each other is reduced to reduce variations in operation. It is in.

[Means for solving the problem]

In order to solve such a problem, the circuit breaker of the present invention is:
An opening / closing mechanism that opens and closes the contacts in response to the operation handle and forcibly opens the contacts in the closed state by driving the trip plate, and an armature facing the trip plate of the opening / closing mechanism movably vertically. Equipped on one side and fix the oil dash pot with the tip facing the amateur on a horizontal side,
Furthermore, the coil is wound around a coil frame into which the oil dash pot is inserted, and an electromagnet device that drives the armature in response to an abnormal current is mounted on a thermoset synthetic resin base. In a circuit breaker in which a cover made of a thermoplastic synthetic resin is attached with a mounting screw, the opening / closing mechanism and the vertical piece of the electromagnet device are fitted into a groove formed in the base, and the cover is opened and closed by the cover. The mechanism unit and the end of the vertical piece of the electromagnet device are pressed and held.

[Action]

The circuit breaker of the present invention is a thermosetting synthetic resin with little deformation because the opening and closing mechanism and the tip of the vertical piece of the electromagnet device are pressed and positioned by the cover at the determined position of the groove of the base. Can determine the mutual reference position, and can stabilize the mutual position of the opening / closing mechanism and the electromagnet device.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

The circuit breaker body is a base 1 made of a thermosetting synthetic resin such as a phenol resin or a polyester resin.
A cover 2 made of a thermoplastic synthetic resin such as polyethylene terephthalate resin or polybutylene terephthalate resin is attached to the cover 2 with mounting screws (not shown). It is equipped with a terminal 3 for electrical connection with the terminal.

Also, this vessel has already been disclosed by the applicant in Japanese Patent Application Laid-Open No. 1-246740.
The opening / closing mechanism unit 4 and the electromagnet device 5 equivalent to the configuration disclosed in Japanese Patent Application Laid-Open No. H10-205163 are housed.

The structure of the opening / closing mechanism unit 4 is such that a movable contact plate 4c is provided with a movable contact 4b opposed to a fixed contact 4a electrically connected to the terminal 3 on the power supply side, and the movable contact plate 4c is mounted around a shaft 4d. The movable contact frame 4e is pivotally attached to the rotatable movable contact frame 4e by spring, and the contacts 4a and 4b are opened and closed by the rotation of the movable contact frame 4e.

Further, one end of a first link 4f is pivotally connected to the movable contact frame 4e, a second link 4g is pivotally connected to the other end of the first link 4f, and the other end of the second link 4g is connected to a pin 4h. Between a swingable operation handle 4k pivotally attached to a cradle 4j having one end pivotally attached to the fixed frame 4i and projecting an operation portion from the cover 2, and pivot shafts of the first link 4f and the second link 4g. The movable contact frame 4e is opened / closed in accordance with the opening / closing operation of the operation handle 4k, supported by the cradle 4j.

The other end of the cradle 4j is detachably engaged with a locking plate 4n pivotally attached to the fixed frame 4i, and the tip of the locking plate 4n is detached from a tripping plate 4p pivotally attached to the fixed frame 4i. And the locking plate 4n is rotated by the rotation of the tripping plate 4p to rotate the locking plate 4n, and the rotation of the locking plate 4n causes the engagement of the cradle 4j. Open and cradle 4j
To open the cradle 4j to open the contacts 4a and 4b in the closed state.

The opening / closing mechanism 4 fits the fixing piece 4q formed on the fixed frame 4i and the pin 4h pivotally connected to the cradle 4j into the insertion grooves 1a and 1b formed on the base 1, and As a result, the cover 2 comes into contact with the upper surfaces of the fixing pieces 4q and the pins 4h and is fixed.

Further, the configuration of the electromagnet device 5 is such that a coil 5a electrically connected between the movable contact plate 4c and the terminal 3 on the load side is wound around a coil frame 5b, and a plunger 5c and a return spring 5d are wound around the coil frame 5b. The oil dash pot 5g is inserted into the cylinder 5e together with the brake oil and sealed with a magnetic lid 5f, and the center of the oil dash pot 5g is substantially L-shaped fixed yoke.
It is fixed to the horizontal piece 5i of 5h and the vertical piece 5j of the fixed yoke 5h.
An armature 5k facing the magnetic lid 5f of the oil dash pot 5g is rotatably mounted on the oil dash pot 5g.

The armature 5k is mounted by projecting the central piece 5m and the side pieces 5n from the vertical piece 5j, inserting the through hole 5p formed at one end of the armature 5k into the central piece 5m, and folding both ends of the armature 5k at one end. The bent piece 5q is brought into contact with the side surface of the vertical piece 5j to be rotatable, and a tension spring 5s is stretched between the hook piece 5r formed at the other end of the armature 5k and the central piece 5m to form the armature 5k. It is biased in the return direction.

Further, the action piece 5t formed at the other end of the armature 5k is opposed to the tripping plate 4p of the opening / closing mechanism 4, and the tripping plate 4p is driven by the suction operation of the armature 5k.

When an overload current slightly larger than the rated current of the circuit breaker flows through the coil 5a by the electromagnet device 5 using the oil dash pot 5g, the plunger 5c is braked in the direction of the magnetic lid 5f by the magnetic flux generated by the coil 5a. It is gradually moved by the resistance of oil to reduce the magnetic resistance, and
The suction operation of 5k is performed, and the trip plate 4p is driven with a time delay.

If a short-circuit current exceeding the rated current of the circuit breaker flows through the coil 5a, the armature 5k is suctioned without waiting for the plunger 5c to move, and the trip plate is instantaneously released.
Drive 4p.

Thus, this electromagnet device 5 fits both sides 5u of the vertical piece 5j of the fixed yoke 5h into the insertion groove 1c formed in the base 1,
Partition wall with the tip of the horizontal piece 5i of the fixed yoke 5h formed on the base 1
1d, the projection 2a formed on the cover 2 by the attachment of the cover 2 abuts on the upper surface of both side pieces 5n of the vertical piece 5j and is fixed.

Further, the rotation of the armature 5k by the tension spring 5s is stopped by the projection 2b formed on the cover 2, and the position of the armature 5k is determined.

[Effect of the invention]

Thus, the circuit breaker of the present invention has an opening / closing mechanism that opens and closes the contacts in response to the operation handle and forcibly opens the contacts in the closed state by driving the tripping plate. An armature facing the tripping plate is movably mounted on the vertical piece, the oil dash pot with the tip facing the armature is fixed on the horizontal piece, and the coil is wound around the coil frame through which the oil dash pot is inserted. An electromagnet device that drives an armature in response to an electric current is mounted on a base made of a thermosetting synthetic resin, and a cover made of a thermoplastic synthetic resin is attached to the base with a mounting screw, In addition, the opening and closing mechanism and the vertical piece of the electromagnet device are fitted into the groove formed in the base, and the cover presses and holds the opening and closing mechanism and the tip of the vertical piece of the electromagnet device. Since the base made of synthetic resin determines the mutual reference position of the opening / closing mechanism and the electromagnet device, it is possible to stabilize the mutual position of the opening / closing mechanism and the electromagnet device, and elastic deformation occurs. The opening / closing mechanism and the electromagnet device can be firmly fixed by a cover formed of a possible thermoplastic synthetic resin, thereby reducing the variation in the distance between the trip plate of the opening / closing mechanism and the armature of the electromagnet device, thereby reducing the circuit. Variations in the operation of the circuit breaker can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is an enlarged front view of a main part of FIG. 1, FIG. 3 is an enlarged side view of a main part of FIG. The figure is a perspective view of the main part of FIG. Reference numeral 1: Base, 1a: Insertion groove, 1b: Insertion groove, 1c: Insertion groove, 1d ...
Partition wall, 2 ... cover, 2a ... protrusion, 2b ... protrusion, 4 ... opening / closing mechanism, 4a ... fixed contact, 4b ... movable contact, 4h ... pin, 4i ...
Fixed frame, 4k… Operation handle, 4p… Trip plate, 5…
Electromagnet device, 5a… coil, 5g… oil dash pot,
5h: fixed yoke, 5k: armature, 5n: piece on both sides, 5t: working piece, 5u: both sides.

Continuation of the front page (72) Inventor Mitsuru Tomita 1048 Odomo Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References JP-A-62-97226 (JP, A) U) Japanese Utility Model Showa 57-103657 (JP, U) Japanese Utility Model Showa 61-99944 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] An opening / closing mechanism for opening and closing a contact in response to an operation handle and forcibly opening a contact in a closed state by driving a tripping plate, and an armature facing the tripping plate of the opening / closing mechanism. Movably mounted on the vertical piece, the oil dash pot whose tip is opposed to the armature is fixed to the horizontal piece, and the coil is wound around a coil frame through which the oil dash pot is inserted, and the armature responds to abnormal current. And a circuit breaker in which the electromagnet device for driving the device is mounted on a base made of a thermosetting synthetic resin, and a cover made of a thermoplastic synthetic resin is attached to the base with mounting screws. A mechanism and a vertical piece of the electromagnet device are fitted into a groove formed in the base, and the cover presses and holds the opening / closing mechanism and the tip of the vertical piece of the electromagnet device. A circuit breaker, characterized in that: