JP2765865B2 - Electromagnetic trip device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electromagnetic trip device with a magnetic locking device,
More particularly, it relates to a ground leakage switch or circuit breaker.

2. Description of the Related Art An electromagnetic trip device is a rotating blade that presses the magnetic pole surface at a set position of a trip device in which the ends of two branch portions form two magnetic pole surfaces forming a common plane. A rotating blade for closing a magnetic circuit formed by the poles and the blade, a permanent magnet for polarizing the magnetic circuit, and a trip coil surrounding the magnetic circuit, wherein the blade is provided on the surface of the magnetic pole. It is adapted to pivot along one outer end.

In sensitive electromagnetic trip devices of the type described above, it is important to prevent small dispersions and to perform a reliable action. Care must be taken in manufacturing such a sensitive electromagnetic trip device, especially with respect to the articulation of the pole surface and the pivoting blade. Modern trip devices include a rotating blade having a notch provided as a knife blade that forms the articulation of the blade.

(Problems to be Solved by the Invention) In order to prevent the magnetic pole surfaces from moving relative to each other due to the rotating action of the blade and rubbing each other, the end of the knife blade is connected to the outer end of the magnetic pole surface of the armature and the joint joint side It is important that they be formed to match. The notch forming the knife blade is close to the pole surface, and it is inevitable that the pole surface will be damaged when removing burrs in forming the notch.

Further, when selecting a blade material, a magnetic material is selected, but generally, this magnetic material does not have sufficient hardness to constitute a connecting blade. The treatments applied to the pole surfaces, especially electropolishing, degrade the properties of the knife blade and make it impossible to make a perfect connection which is essential for the correct operation of the trip device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-sensitivity trip device in which the treatment of the blade, in particular the treatment of the pole surface, can be performed independently of the coupling action of the rotating blade.

[Configuration of the invention]

(Means for Solving the Problems) In the electromagnetic trip device according to the present invention, the rotation line of the blade is defined by a knife blade, and the knife blade belongs to an independent holding member firmly attached to the blade, and the holding member Has a stopper and a protruding end which serves as a bracket surrounding the blade from the side, the stopper cooperating with the knife blade with an abutment surface firmly fixed to the armature to extend in the longitudinal direction of the blade. Determine the position,
Regulates longitudinal movement of the blade relative to the armature, prevents wear and dispersion of the armature and blade due to this movement, and the end of the bracket is inclined to form a knife blade as an articulation with the blade. It is characterized by that.

(Operation) By making the knife blade as an articulation part a member independent of the blade, the material of the blade and the material of the articulation part can be different, and a material having the required characteristics can be selected. it can. For example, the retaining member may be made of steel, while the blade may be formed of an iron-nickel alloy having suitable magnetic properties. The holding member consists of a platelet and is attached to the blade by soldering at the end of the manufacturing process, especially after finishing the treatment of the pole surface of the blade. The blade is biased to a disengaged position by a spring disposed to hold the knife blade on the abutment surface. As the knife blade moves away from the abutment surface, the longitudinal movement of the blade
The holding member connected to the blade is regulated by a stopper provided to face the knife blade. The abutment surface for the articulation of the knife blade is provided on a plate rigidly mounted on the armature. Also shown are two projections that are inserted between the knife blade and the stopper formed by the holding member and protrude from the magnetic pole surface of the armature. The material of this plate can be selected to form an articulation joint together with the knife blade, so that a material having low friction and high operation reliability can be obtained.

Other advantages and features will become apparent from the embodiments described below.

(Embodiment) In the drawing, the circuit of the high-sensitivity electromagnetic trip device includes a U-shaped armature 10 and a rotating blade 12. Armature
The ends of the two bifurcated sections 14, 16 of 10 are provided as pole surfaces 18, 20, which are arranged on the same plane. In the setting position of the trip device, the blade 12 abuts against this surface.

The branch 14 of the armature 10 holds the coil 22, and the permanent magnet 24 that polarizes the armature 10 is a branch.
It is inserted between 14 and 16.

The blade 12 is rotatable about an axis coinciding with the outer end 26 of the pole surface 20 and is biased by a spring 28 toward a disengaged position. These devices are housed in a case 30, through which control pins
32 are provided.

Electronic trip devices of this kind are known and include a blade 12.
Suffice to be held in the pressed position on the armature 10 by the permanent magnet against the return force of the spring 28. The blade 12 is released by the excitation of the coil 22, and the blade 12 rotates to the trip position by the action of the spring 28.

According to the invention, the blade 12 is formed by a rectangular plate longer than the distance between the branches 14,16 and extends on the connection side 26 with the return spring 28 to be mounted. This plate
12 is selected from a suitable magnetic material, is heat treated, is sufficiently polished, and forms as good a pole surface as possible.

The blade 12 has a retaining member 34 in the articulation area. The holding member 34 protrudes outward from the side of the blade 12 and the branch portion 16 of the armature 10.

The small plate-shaped holding member 34 is made of, for example, a steel plate, pressed against the upper surface of the blade 12 opposite to the magnetic pole surface, and soldered.
It is rigidly attached to this blade 12, for example by two soldering points 36.

The two projecting ends of the holding member 34 are bent to form brackets 38, 40 surrounding the blade 12 from the side. Has formed.

The outer end of the branch 16 of the armature 10 has a plate 44,
The ends of 44 are two protrusions 46 and 48 protruding from the magnetic pole surface 20 of the armature 10.

These two projections 46, 48 are arranged opposite the folding brackets 38, 40, and the knife blade 42 abuts these projections 46, 48 forming the support surface of the articulation. The return spring 28 is slightly inclined so that the contact portion of the knife blade 42 acts on the projections 46 and 48. The projections 46, 48 are inserted between the knife blade 42 and the holding stoppers 50, 52. The held stoppers 50 and 52 regulate the movement of the blade 12 in the longitudinal direction.

In the magnetic position of the blade 12 shown in FIG. 2, the articulation of the knife blade 42 defines the blade 12 in one longitudinal direction. In this case, the blade is completely freely pressed onto the pole surface.

The knife blade 42 is aligned with the outer end 26 of the pole surface 20 that forms the pivot axis of the blade 12. When a trip occurs, the blade 12 pivots, guided by the knife blade 42 and the end 26. As a result, relative frictional movement between the magnetic pole surface of the armature 10 and the magnetic pole surface of the blade 12 can be prevented.

The guiding function will be performed by the holding member 34 as a whole, and the blade 12 will only perform the opening and closing operation of the magnetic field of the electromagnetic trip device circuit. Obviously, the retaining members 34 can be provided differently and may be constituted by machined parts and attached to the blade 12.

The invention is of course not limited to the embodiments described here.

[Brief description of the drawings]

1 is a schematic sectional view of an electromagnetic trip device according to the present invention, FIG. 2 is a detailed view of the blade of FIG. 1 in a magnetic force position, and FIG. 3 is a plan view of the blade in FIG. 10 ... armature, 12 ... blade, 14, 16 ... branch, 18,
20: Magnetic pole surface, 22: Trip coil, 24: Permanent magnet, 42: Knife blade, 46, 48: Projection, 50, 52: Stopper.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H01H 73/36 H01H 83/02 H01H 71/32

Claims (4)

(57) [Claims] 1. A U-shaped armature (10) forming two magnetic pole surfaces (18, 20) having ends of two branch portions (14, 16) forming a common plane, and at a set position of a trip device. A rotating blade (12) which presses the magnetic pole surfaces (18, 20) to close a magnetic circuit formed by the armature and the blade;
And a permanent magnet (24) for polarizing the magnetic circuit
And a trip coil (22) surrounding the magnetic circuit, wherein the blade (12) is a ground leak switch or circuit with a magnetic force locking device pivoted along the outer edge of one of the pole surfaces (20). In an electromagnetic trip device for a circuit breaker, a rotation line of the blade (12) is defined by a knife blade (42), and the knife blade (42) is an independent holding member (34) firmly attached to the blade (12). Wherein the holding member (34) has a stopper (50, 52) and a protruding end portion serving as a bracket (38, 40) surrounding the blade (12) from the side, and the stopper (50, 52) With the knife blade (42), the contact surfaces (46, 4) firmly fixed to the armature (10)
In cooperation with 8), the longitudinal position of the blade (12) is determined, the longitudinal movement of the blade (12) relative to the armature (10) is regulated, and the armature (10) and the blade ( 12) to prevent wear and dispersal, the ends of said brackets (38, 40) being inclined to form a knife blade (42) as an articulation with the blade (12). Electromagnetic trip device. 2. A plate (44) at the outer end of the armature (10) having two projections (46, 48) projecting from the associated pole surface (20) and laterally surrounding the blade (12).
The two projections (46, 48) are inserted into the gap between the knife blade (42) and the stopper (50, 52) to define the longitudinal position of the blade. The electromagnetic trip device according to claim 1, wherein 3. A knife blade (4) is provided on said contact surface (46, 48).
By applying the pressing force from 2), the spring (2
Electromagnetic trip device according to any of the preceding claims, characterized in that (8) biases the blade (12) to a separate trip position. 4. The holding member (34) is made of a small steel plate mounted on the surface opposite to the magnetic pole side surface in the articulation region of the blade, and is firmly mounted on the blade (12) by soldering. And said holding member has two lateral extensions forming brackets (38, 40), the ends of said brackets (38, 40) forming knife blades (42). Claims 1 to 3
The electromagnetic trip device according to any one of the above.