JPS6013151Y2 - AC relay - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an electromagnet for an AC relay equipped with a corner coil.

For example, in an AC relay that operates using alternating current at the commercial power frequency as an excitation input, the magnetic flux path between the armature and the iron core is formed into a serpentine branch, and a copper ring (called a corner coil) is attached to one of the magnetic poles of the serpentine branch. ) to shift the phases of the branched magnetic fluxes from each other to reduce fluctuations in the magnetic flux due to alternating current in order to stabilize the operation.

The present invention has been made to improve the structure of the corner coil, which is essential to the electromagnet of such an AC relay, and to obtain a stable operating function against temperature changes caused by the operation of the relay or otherwise.

FIG. 1 shows only the essential parts of the electromagnet of a relay having such a conventional structure.

Note that the armature of the relay and related contact portions are not shown.

In the figure, 1 is an excitation coil, and this is a winding frame 2 made of an insulator.
An insulated wire is wound around it.

Reference numeral 3 denotes an iron core having, for example, a circular cross section, and a half-moon shaped corner coil 4 (see FIG. 2) is fitted into the upper end surface of this core as shown in the figure.

5 is a yoke which is connected to the iron core 3 by tightening or the like in the lower part of the figure.

A movable armature 6 is movably engaged with the yoke 5, and together with the iron core 3 forms an excitation magnetic circuit for the coil 1.

FIG. 2 shows an enlarged perspective view of the cornered coil and the core magnetic pole to which the coil is attached.

As is clear from FIG. 2, the corner coil 4 is inserted into one of the two magnetic poles branched by the slotted groove 8 provided in the axial direction of the magnetic pole surface, and is inserted into one of the two magnetic poles to prevent it from being pulled out. It is attached to the center surface of the flange of the winding frame 2 in a tightened state.

In such a conventional mounting structure of the cornered coil 4,
When displacement occurs due to thermal expansion of the winding frame 2 due to a temperature rise accompanying the operation of the relay coil 1 or during operation in a high temperature state, the edges of the winding frame may sometimes be distorted because both ends are restricted. There is a risk of contact with the armature, deformation of the corner fill, change of the constricted portion of the yoke 5 and iron core 3, or tilting of the iron core.

As a result, a minute gap is created between the iron core 3 and the armature 6,
This is a serious inconvenience as it causes various types of malfunctions such as humming.

The object of the present invention is to provide an AC relay that is stable at temperatures where such phenomena do not occur.

The feature is that a corner coil part that is fitted into one of the magnetic poles, which includes a groove that branches the magnetic pole tip at the upper end of the core, and a cylindrical part that surrounds the core and have a part cut off, are integrated. The corner coil portion and the cylindrical body portion of the copper ring are fitted into each of the magnetic poles, and the upper end of the copper ring is prevented from protruding from the upper end of the iron core. The AC relay is configured as follows.

The corner coil of the present invention will be explained below with reference to FIGS. 3 to 5.

Figure 3 is a perspective view of the cornered coil of the present invention, and Figure 4 is a perspective view of the corner coil of the present invention.
FIG. 5 is a sectional view of the main part of the coil shown in the figure attached to the iron core of the relay electromagnet, and FIG. 5 is a perspective view showing only the main part of the electromagnet part of the relay according to the present invention.

Note that the armature of the relay and related contact parts are not shown.

FIG. 3 shows a ring body 9 having a two-stage structure as shown in the figure, which is formed from a copper pipe instead of the conventional punching and forming of a suitable shape from a copper plate (see 4 in FIG. 2).

That is, the upper side is a corner coil forming a half-moon-shaped copper ring, and the lower side is a cylinder 11 cut by an axial slit 10.

Figure 4 shows the above-mentioned ring body 9 placed on the winding frame 2 and attached to the iron core 3, with the ring body 9 placed on the winding frame 2 and attached to the iron core 3, and the surface perpendicular to the slot 8 of the iron core 3 (Fig. 3 A).
-A' (a plane parallel to the slit 10), the groove 12 provided on the upper surface of the winding frame 2 is shown.

The groove 12 is formed by the iron core 3 and the ring 9.
The dimensions are set to fit the outer diameter of the

Note that the coil 1 is omitted from the drawing.

In the above configuration, the upper stage side of the ring body 9 is fitted into one of the two magnetic poles branched by the split groove 8 on the upper end surface of the iron core 3 so as to function as a corner coil.
In the lower cylindrical portion, the cylindrical portions 11 on both sides of the slit 10 elastically fit and engage with the inner diameter of the groove 12 of the winding frame 2.

Therefore, when the winding frame 2 expands in the axial direction due to an increase in the temperature of the coil 1 due to energization or a high temperature state, the winding frame 2 contacts the ring body 9 with the entire circumference of the concave groove 12, and the winding frame 2 receives a substantially uniform force over the entire ring body 9.
move.

Further, the ring body 9 also moves while receiving a substantially uniform force from the winding frame 2 over the entire circumference of the iron core 3.

Therefore, abnormalities such as deformation of the corner coil, deformation (warpage) of the winding frame, inclination of the iron core, etc., which occur in the case of the conventional structure in which the winding frame and the corner coil contact each other in a biased manner, are reduced.

Of course, in the above state, the upper end of the ring body 9 is set so as not to come into contact with the upper end of the iron core 3 or the flange surface of the winding frame 2 with the armature.

Furthermore, the winding frame 2 is fixed to the lower surface of the yoke 5 by means not shown.

Although the embodiments used in the above explanation have been explained using an iron core having a circular cross section, it is of course applicable to a core having a rectangular cross section without changing the gist of the present invention.

As is clear from the above description, the present invention has great practical effects in that it enables stable operation of AC relays over a wide temperature range and increases its reliability.

[Brief explanation of drawings]

Figure 1 shows a conventional corner-cut coil in an electromagnet for an AC relay; Figure 2 is an enlarged perspective view of the corner-cut coil in Figure 1;
Figure 3 is a perspective view of the cornered coil of the present invention, Figures 4 and 5.
The figures are a cross-sectional view and a perspective view of the cornered coil of FIG. 3 mounted on an electromagnetic winding frame. In the figure, 1... Coil, 2... Winding frame, 3
... Iron core, 4 ... Corner coil, 6.
... Armature, end ... Magnetic pole split groove, 9...
...Two-stage ring body according to the present invention, 10...
...Slit, 12...A recessed portion provided in the winding frame 2 to become a recessed groove.

Claims (1)

[Scope of utility model registration request] A two-stage structure in which a corner coil part that is fitted into one of the magnetic poles, which includes a groove part that branches the magnetic pole end part at the upper end of the iron core, and a cylindrical body part that surrounds the iron core and have a part thereof cut off, are integrally formed. An alternating current relay comprising a copper ring, the cornered coil part and the cylindrical body part of the copper ring are fitted into each of the magnetic poles, and the upper end of the copper ring is provided so as not to protrude from the upper end of the iron core. .