JP2005222712A - Operation electromagnet of electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the operation force by widening the insulation distance between an operation electromagnet and a contact part as well as shortening a flux path. <P>SOLUTION: Contact parts are arranged outside an armature 6 astride a pole-contact face 15 formed by a T-shape end face of a gate core 1 through an operating piece of an insulator, and by separating the contact parts from the operation electromagnet 8 with the operating piece 7, an insulation interval between the operation electromagnet 8 and the contact parts set large. A space surrounded by the gate core 1 and the strip-shape armature 6 is to be a coil-winding space alone, so that the magnetic circuit is shortened by shortening leg parts of the gate core 1 and at the same time, a height of the operation electromagnet 8 is reduced to downsize the electromagnetic relay. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to an operation electromagnet mainly used for a thin electromagnetic relay mounted densely on a printed board.

  As the above-described thin electromagnetic relay, one described in Patent Document 1 is known. 5 to 7 show the main part of the electromagnetic relay according to Patent Document 1 again. In FIG. 5, reference numeral 1 denotes a gate-shaped iron core made of a magnetic plate. A coil wire 3 is wound around a bobbin 2 fitted in a body portion thereof to form an electromagnetic coil 5, and both ends of the coil wire 3 are fixed to the bobbin 2. The pair of coil terminals 5 are connected. On the other hand, in FIG. 6, reference numeral 6 denotes an inverted portal armature made of a magnetic plate, and an operating piece 7 made of an insulating material is fitted in the body portion thereof. FIG. 7 is an exploded view of the electromagnetic relay. An armature 6 is arranged along the side surface of the iron core 1 as shown in the figure, and an operation electromagnet 8 is configured.

  In FIG. 7, the iron core 1 is fixed with the insertion portions 1 a (FIG. 5) at both ends of the leg portions being press-fitted into the insertion holes 10 in the insulating substrate 9 of the electromagnetic relay, and the armature 6 has one leg piece 6 a at the insulating substrate. 9 is inserted into the receiving hole 11 and supported rotatably. A movable plate spring 12 and a fixed plate spring 13 are fixed to the insulating substrate 9, and a movable contact 12a and a fixed contact 13a are joined to their opposing surfaces. Thus, when the armature 6 is supported by the insulating substrate 9, the operating piece 7 comes into contact with the movable plate spring 12, and the armature 6 is pushed by the movable plate spring 12 through the operating piece 7 and is separated from the iron core 1. Placed in.

  In such an electromagnetic relay, when the electromagnetic coil 4 is excited, the armature 6 is attracted to the side surface of the iron core 1, and the armature 6 rotated around the leg piece 6 a at this time is moved through the operating piece 7. The spring 12 is bent. As a result, the movable contact 12a contacts the fixed contact 13a and closes the electric circuit. Further, when the electromagnetic coil 4 is demagnetized, the armature 6 is desorbed, the movable leaf spring 12 is elastically restored, the movable contact 12a is separated from the fixed contact 13a, and the armature 6 is separated from the iron core 1. Return.

Japanese Patent Laid-Open No. 1-302631

  In recent years, safety requirements for electrical appliances have increased, and it has been desired to further increase the insulation distance between components. On the other hand, in the operation electromagnet 8 in the above-described prior art, the movable / fixed leaf springs 12 and 13 are arranged in a space surrounded by the portal iron core 1 and the inverted portal armature 6. Therefore, it is difficult to take a sufficient insulation distance between the operation electromagnet 8 and the contact portion (movable / fixed leaf springs 12, 13). Further, since the conventional operating electromagnet 8 is attracted by the side surfaces of the leg portions of the iron core 1 and the armature 6, the magnetic flux has to go around a long magnetic path, and the magnetic resistance of the magnetic path increases. In general, in an electromagnet device, the operating force on the armature is inversely proportional to the length of the magnetic path.

  An object of the present invention is to increase an insulation distance between an operation electromagnet and a contact portion in a thin electromagnetic relay, and to make the operation electromagnet compact to shorten a magnetic path and enhance an operation force.

  In order to solve the above-mentioned problems, the operating electromagnet of the present invention is composed of two portal-shaped magnetic plates whose legs are bent sideways into L-shapes, and these magnetic plates are stacked back to back, and the both legs A coil wire is wound around an iron core that forms an armature surface on the T-shaped end surface of the wire, and a bobbin fitted in the body of the iron core, and both ends of the coil wire are electromagnetically connected to a coil terminal fixed to the bobbin. A coil, an armature formed of a strip-shaped magnetic plate disposed so as to straddle the armature surface of the iron core, and an operating piece of an insulator fixed to the armature, and the armature is excited by excitation of the electromagnetic coil. It is assumed that a movable plate spring that is attracted to the iron core and disposed on the opposite side of the iron core with the armature interposed therebetween is operated via the operating piece.

  In the present invention, since the contact portion (movable / fixed leaf spring) is disposed outside the armature straddling the contact surface of the portal iron core via the insulator operating piece, the contact portion is the operating piece and the operation electromagnet. As a result, the insulation distance between the operation electromagnet and the contact portion can be increased. In addition, the space surrounded by the portal iron core and the rectangular armature is only the winding space of the electromagnetic coil, and the leg portion of the portal iron core is shortened, so that the magnetic path is shortened.

  According to the present invention, a large insulation distance can be secured between the operation electromagnet and the contact portion, the leg portion of the portal iron core is shortened, the magnetic path is shortened, and the height of the operation electromagnet is lowered to reduce the electromagnetic force. The relay can be miniaturized.

  Embodiments of the present invention will be described below with reference to FIGS. In addition, the same code | symbol shall be used for the part corresponding to a prior art example. Here, FIG. 1 is an exploded perspective view of the operating electromagnet, FIG. 2 is a perspective view of the iron core in FIG. 1, FIG. 3 is an exploded perspective view of the substrate portion of the electromagnetic relay, and FIG. 4 is a perspective view of the electromagnetic relay. First, in FIG. 2, the iron core 1 is composed of two portal-shaped magnetic plates 14 in which both leg portions 14 a are bent sideways into L-shapes, and these magnetic plates 14 are stacked back to back, and the T of both leg portions 14 a. A contact surface 15 is formed on the end face of the shape. As will be described later, the magnetic plate 14 is formed with a protrusion 7b and a notch 14c that are fitted to a part of the insulating substrate 9.

  As shown in FIG. 1, a bobbin 2 is fitted into the body of the iron core 1 from the lower side of FIG. 1, and a coil wire 3 is wound around the bobbin 2 to form an electromagnetic coil 4. It is connected to a coil terminal 5 fixed to the bobbin 2 by fitting. In FIG. 1, the armature 6 is formed of a strip-shaped magnetic plate and is disposed so as to straddle the contact surface 15 of the iron core 1 as will be described later. An operating piece 7 made of an insulating material is caulked to the armature 6 via an integrally formed mounting leg 7a. The actuating piece 7 covers the surface and side surface opposite to the iron core 1 of the armature 6 except for the fulcrum end 6b at the right end of the armature 6 in FIG. 14d is formed in a protruding manner.

  On the other hand, in FIG. 3, the insulating substrate 9 includes a box-shaped main body 9-1 and a plate-like cover 9-2 attached to the side surface thereof. The cover 9-2 is attached to the substrate body 9-1 by supporting legs 9a and 9b protruding sideways into the recesses 9c and 9d that open on the side surfaces of the substrate body 9-1. At both ends of the insulating substrate 9 (9-1, 9-2), as will be described later, a pair of notches 9e and protrusions 9f that are fitted to the iron core 1 are formed. Further, a support portion 9g that pivotally supports the fulcrum end portion 6b of the armature 6 is formed at the right end of the substrate body 9-1 in FIG.

  In FIG. 3, the movable leaf spring 12 has the bent end portion of the movable contact terminal 16 joined to the left end support end portion 12b of FIG. 3, and the movable contact 12a joined to the upper surface of the free end. The movable plate spring 12 is fixed by press-fitting a support end 12b into a recess 9h that opens in the side surface of the substrate body 9-1. In addition, the fixed leaf spring 13 in which the fixed contact terminal 17 is integrally formed to be bent in an L shape has a fixed contact 13a bonded to the lower surface, and a mounting piece 13b folded in a U-shape at the bottom is opened on the side surface of the substrate body 9-1. It is fixed by being press-fitted into the recess 9i. In this state, the movable contact 12a and the fixed contact 13a face each other with a predetermined gap.

  In order to assemble the above-described parts, the protrusions 14b and the notches 14c formed on the magnetic plate 14 of the iron core 1 are fitted into the notches 9e and the protrusions 9f of the insulating substrate 9, and the iron core portion of the operation electromagnet 8 (the iron core 1). And the electromagnetic coil 4) is fixed to the insulating substrate 9. At that time, the coil terminal 5 is fitted into the grooves 9j and 9k on the side surface of the substrate body 9-1. Here, when the iron core portion is fixed, the movable / fixed leaf springs 12 and 13 are press-fitted and fixed to the board body 9-1 before the cover 9-2 is attached to the board body 9-1. Is sandwiched between the iron core portion and the substrate main body 9-1, and the fulcrum end 6b is placed on the support 9g. At the same time, the slit 7c cut in the operating portion 7b (FIG. 1) of the operating piece 7 is fitted to the movable plate spring 12, and the operating piece 7 and the movable plate spring 12 are connected. As a result, the armature 6 receives an elastic force from the movable plate spring 12 and is held away from the iron core 1.

  FIG. 4 shows the electromagnetic relay assembled as described above. In this electromagnetic relay, when the electromagnetic coil 4 is excited, the armature 6 is attracted to the contact surface 15 of the iron core 1 and lifts the movable leaf spring 12 through the operating piece 7. As a result, the gap between the movable contact 12a and the fixed contact 13a is closed. When the electromagnetic coil 4 is demagnetized, the movable contact 12a is separated from the fixed contact 13a by the restoring force of the movable leaf spring 12, and at the same time, the armature 6 is returned to a position away from the iron core 1.

  In the illustrated embodiment, a contact portion (movable / fixed leaf springs 12, 13) is disposed on the outside of the armature 6 straddling the contact surface 15 formed by the T-shaped end face of the portal iron core 1 via an insulating operating piece 7. Therefore, the contact portion is separated from the operation electromagnet 8 by the operating piece 7, and the insulation distance between the operation electromagnet 8 and the contact portion can be increased. In addition, the space surrounded by the portal iron core 1 and the strip-shaped armature 6 is only the winding space of the electromagnetic coil 4, and the legs of the portal iron core 1 can be shortened, so that the magnetic path is shortened and the operation electromagnet The height of 8 becomes low, and the electromagnetic relay is reduced in size accordingly.

It is a disassembled perspective view of the operation electromagnet which shows embodiment of this invention. It is a perspective view of the iron core in FIG. It is a disassembled perspective view of the insulated substrate part of the electromagnetic relay in which the operation electromagnet of FIG. 1 is used. It is a perspective view of the electromagnetic relay using the operation electromagnet of FIG. It is a perspective view which shows the iron core part in the conventional operation electromagnet. It is a perspective view which shows the armature part in the conventional operation electromagnet. It is a disassembled perspective view of the conventional electromagnetic relay.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Iron core 2 Bobbin 4 Electromagnetic coil 6 Armature 7 Actuating piece 8 Operating electromagnet 9 Insulating substrate 12 Movable leaf spring 13 Fixed leaf spring 15 Armature surface

Claims (1)

The two leg portions are composed of two gate-shaped magnetic plates bent sideways into an L shape, and these magnetic plates are stacked back to back, and an iron core forming an armature surface on the T-shaped end surfaces of the both leg portions;
A coil wire is wound around a bobbin fitted into the core of the iron core, and both ends of the coil wire are electromagnetic coils connected to coil terminals fixed to the bobbin;
An armature made of a strip-shaped magnetic plate disposed so as to straddle the armature surface of the iron core;
And an insulating working piece fixed to the armature,
Operation of an electromagnetic relay, wherein the armature is attracted to the iron core by excitation of the electromagnetic coil, and a movable leaf spring disposed on the opposite side of the iron core with the armature interposed therebetween is operated via the operating piece. electromagnet.

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