JP2014220191A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic contactor which can eliminate the difference in distance between a plurality of movable contacts and fixed contacts caused by the inclination of a crossbar in operation.SOLUTION: An electromagnetic contactor comprises: a plurality of pairs of fixed contact pieces having fixed contacts and fixed to a housing with a predetermined distance therebetween; a plurality of movable contact pieces each having, on both ends, a pair of movable contacts which move closer to or away from each of the fixed contacts; a compression spring which is engaged, on its one end, with a center portion of each of the movable contact pieces so as to press the movable contact pieces against the fixed contact pieces; a crossbar which supports the other end of the compression spring and the center portion of each of the movable contact pieces, and which has, at its proximal end, a base with a movable iron core fixed thereto; an electromagnetic actuator arranged in the housing, which has a fixed iron core arranged to face the movable iron core and displaces the crossbar so as to move the movable contact pieces closer to or away from the fixed contact pieces; and a positioning guide arranged in the housing and having a gap between itself and the crossbar which becomes narrower as the movable iron core comes closer to the fixed iron core.

Description

  The present invention relates to an electromagnetic contactor.

  Conventionally, an electromagnetic coil that supports a hollow part of a winding frame in a horizontal direction, a fixed iron core whose armature surface is supported perpendicular to the horizontal center line of the hollow part, and a movable frame provided with a movable contact. In an electromagnetic contactor including a movable iron core that is freely connected and is inserted into the reel hollow portion and is attracted to the fixed iron core by the bias of the electromagnetic coil, at least a part of the lower surface of the reel hollow portion Is provided with a projecting surface that comes into contact with the lower surface of the movable core in the hollow portion, and an electromagnetic device of an electromagnetic contactor in which the armature surface of the movable core is perpendicular to the horizontal center line of the hollow portion. It is disclosed (for example, see Patent Document 1).

  Also, the movable contact is held on the movable insulation base connected to the electromagnet movable core, and comes into contact with the fixed stopper surface immediately before the movable insulation base is charged and released. An electromagnetic contactor provided with a sliding piece that generates force is disclosed (for example, see Patent Document 2).

JP 63-239749 A JP 63-228545 A

  However, according to the conventional technique described in Patent Document 1, when the movable iron core is attracted to the fixed iron core by the excitation of the fixed iron core, the lower side surface of the movable iron core contacts the protruding surface on the lower surface of the hollow part of the reel. In contact with each other, a frictional force is generated between the movable iron core and the projecting surface, so that there is a problem that the attraction force of the electromagnetic coil has to be increased and the power consumption increases. Further, when the fixed iron core is demagnetized and the movable iron core returns, a large force is required, and there is a problem that the spring constant of the coil spring must be increased.

  Further, according to the conventional technique described in Patent Document 2, even if a sliding piece that abuts against the fixed stopper surface and generates a frictional force by relative movement with the movable insulating base is provided, the movable insulating base and the housing There is a problem in that it is impossible to correct the inclination of the movable insulating stand caused by a gap between the movable contact and the distance between the plurality of movable contacts and the fixed contacts.

  The present invention has been made in view of the above, and is capable of eliminating the difference in distance between the plurality of movable contacts and the fixed contact caused by the inclination of the operating crossbar, and the crossbar and the housing. An object of the present invention is to obtain an electromagnetic contactor that does not require high dimensional accuracy and does not increase the power consumption of the exciting coil.

  In order to solve the above-described problems and achieve the object, the present invention provides a plurality of pairs of fixed contacts that have fixed contacts and are fixed to a housing at a predetermined distance, and contact the fixed contacts at both ends. A plurality of movable contacts having a pair of spaced apart movable contacts, a push spring that engages the central portion of the movable contact at one end and presses the movable contact against the fixed contact, and other than the push spring A crossbar that supports the end and the central portion of the movable contact and has a movable core fixed to a pedestal provided at the base end, and is disposed in the housing and disposed to face the movable core. An electromagnetic actuator that includes a fixed iron core and displaces the cross bar to bring the movable contact into and out of contact with the fixed contact; and the cross bar as the movable iron approaches the fixed core, and is disposed within the housing. When A positioning guide gap is narrowed between, characterized in that it comprises a.

  According to the present invention, the difference in distance between the plurality of movable contacts and the fixed contact caused by the inclination of the crossbar during operation is eliminated, and the damage of the contact due to the arc generated between the movable contact and the fixed contact is made uniform. The contact life can be extended.

FIG. 1 is a front cross-sectional view showing a contact open state of Embodiment 1 of an electromagnetic contactor according to the present invention. FIG. 2 is a top view of the electromagnetic contactor according to the first embodiment. FIG. 3 is a front cross-sectional view illustrating the electromagnetic contactor according to the first embodiment when the contact is closed. FIG. 4 is a side cross-sectional view showing the contactor of Embodiment 2 of the electromagnetic contactor according to the present invention.

  Embodiments of an electromagnetic contactor according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a front sectional view showing a contact opening state of an electromagnetic contactor according to Embodiment 1 of the present invention, FIG. 2 is a top view of the electromagnetic contactor of Embodiment 1, and FIG. FIG. 3 is a front cross-sectional view showing when the contact of the electromagnetic contactor according to the first embodiment is closed.

  The housing of the electromagnetic contactor 91 according to the first embodiment includes a lower housing 1 that accommodates the electromagnetic actuator 10 and the like, and an upper housing 2 that accommodates a contact and the like and covers the lower housing 1. In the middle of the upper housing 2, three pairs (see FIG. 2) of fixed contactors 3, which have external contacts 5 having an inner end having a fixed contact 4 and an outer end having a terminal screw 3 a, are separated by a predetermined distance. Is fixed. The external connection terminals 5 are connected to the power supply line and the load line, respectively.

  A cross bar 6 is disposed between the three pairs of fixed contacts 3, that is, in the center of the electromagnetic contactor 91. The upper end of the cross bar 6 is guided by the guide hole 2a of the upper housing 2, and can be displaced in the vertical direction of FIG. An E-shaped movable iron core 11 is fixed to the base 6 a at the base end of the cross bar 6. Further, an E-shaped fixed iron core 14 around which the exciting coil 12 is wound around the center pole is fixed to the bottom of the lower housing 1. Between the exciting coil 12 and the concave portion of the movable iron core 11, a return spring 15 wound in a conical shape for separating the fixed iron core 14 and the movable iron core 11 when the exciting coil 12 is not energized is disposed. The exciting coil 12, the fixed iron core 14, and the return spring 15 constitute the electromagnetic actuator 10.

  Three rectangular windows 6b of the crossbar 6 facing in the left-right direction in FIG. 1 are provided with three elongated flat plate-like movable contacts 8 provided with movable contacts 7 that contact and separate from the fixed contacts 4, respectively. The center portion is inserted and supported so as to be positioned in the square window 6b. The upper surface side of the center portion of each movable contact 8 is engaged with one end of the push spring 9. The pressing spring 9 is slightly compressed, and the other end is supported on the upper side of the square window 6b. That is, the other end of the push spring 9 and the central portion of the movable contact 8 are supported by the cross bar 6. In the state of FIG. 1 in which the exciting coil 12 is not energized, each movable contact 8 is pressed against the lower side of the square window 6b by a pressing spring 9.

  A positioning guide 16 is disposed inside the upper side wall of the lower housing 1 so that the gap between the cross bar 6 and the pedestal 6a gradually narrows as the movable iron core 11 approaches the fixed iron core 14. The positioning guide 16 has an inclined surface 16a in which the gap between the cross bar 6 and the pedestal 6a gradually narrows as the movable iron core 11 approaches the fixed iron core 14, and a vertical surface 16b in which the gap between the pedestal 6a is constant. ing. The positioning guide 16 or the pedestal 6a may be formed of an elastic material such as a spring material. Further, it is preferable that the area of the side surface 6b of the pedestal 6a is increased so that the cross bar 6 is likely to be vertical when the side surface 6c of the pedestal 6a facing the vertical surface 16b of the positioning guide 16 comes into contact with the vertical surface 16b. (See FIG. 3).

  Next, operation | movement of the electromagnetic contactor 91 of the above-mentioned Embodiment 1 is demonstrated. When the exciting coil 12 shown in FIG. 1 is energized from a non-energized state, the fixed iron core 14 is excited. The movable iron core 11 is attracted to the fixed iron core 14 together with the cross bar 6 against the return spring 15 and displaced downward. When the cross bar 6 is displaced downward, the positioning guide 16 corrects the inclination of the cross bar 6 so that the movable iron core 11 and the fixed iron core 14 become parallel, and the three movable contacts 8 and the three pairs of fixed contacts 3 Become parallel.

  By forming the positioning guide 16 or the pedestal 6a with an elastic material such as a spring material, it is possible to reduce the impact when the pedestal 6a collides with the positioning guide 16.

  When the three movable contacts 8 and the three pairs of fixed contacts 3 are parallel, the six movable contacts 7 and the fixed contacts 4 abut at the same time, and the power supply line and the load line connected to the fixed contacts 3 are connected. Conduction is made through the movable contact 3.

  On the other hand, when the energization to the exciting coil 12 is cut off, the fixed iron core 14 and the movable iron core 11 are demagnetized, and the movable iron core 11, the cross bar 6 and the movable contact 8 are displaced upward by the spring force of the return spring 15. The fixed iron core 14 and the movable iron core 11 are separated. When the movable iron core 11 is displaced upward, there is a gap between the pedestal 6a and the positioning guide 16. Therefore, the cross bar 6 fixed to the movable iron core 11 is smoothly displaced upward, and the movable contact 8 is also moved upward. Displace. When the movable contact 8 is displaced upward, the fixed contact 4 and the movable contact 7 are separated to return to the state of FIG. 1, and the electromagnetic contactor 91 is in a non-energized state.

  In the electromagnetic contactor 91 according to the first embodiment, the inclination of the movable contact 8 is corrected by guiding the pedestal 6a with the positioning guide 16. However, instead of the pedestal 6a, the movable iron core 11 is provided. Even if the positioning guide 16 is used for guiding, the same effect can be obtained.

  According to the electromagnetic contactor 91 of the first embodiment configured as described above, the exciting coil 12 is energized, the fixed iron core 14 is excited to attract the movable iron core 11, and the movable contact 7 and the fixed contact 4 are in contact with each other. When the movable iron core 11 approaches the fixed iron core 14 while the inclination of the cross bar 6 is corrected by the positioning guide 16 provided in the lower housing 1, the three rows of the movable contacts 8 and the fixed contact 3 are parallel to each other. Is maintained, and the six movable contacts 7 and the fixed contacts 4 are in contact with each other simultaneously.

  When the distances between the movable contacts 7 and the fixed contacts 4 arranged at a plurality of locations are equal, arcs generated by opening and closing the movable contacts 7 and the fixed contacts 4 are also uniform. As a result, the consumption of the movable contact 7 and the fixed contact 4 by the arc becomes uniform, and the contact life can be extended.

  Further, since there is a gap between the pedestal 6a and the positioning guide 16, no frictional force is generated between the pedestal 6a and the positioning guide 16, and it is not necessary to increase the spring force of the return spring 15, and the exciting coil 12 There is no need to increase the power supplied to Furthermore, if the positioning guide 16 is formed of an elastic body such as a spring material, even if the pedestal 6a collides with the positioning guide 16, damage to the pedestal 6a can be prevented.

Embodiment 2. FIG.
FIG. 4 is a side cross-sectional view showing the contactor of Embodiment 2 of the electromagnetic contactor according to the present invention. As shown in FIG. 4, the electromagnetic contactor 92 according to the second embodiment has an inclined surface on the inner side wall of the upper housing 2 where the gap with the cross bar 6 gradually narrows as the movable iron core 11 approaches the fixed iron core 14. A positioning guide 26 having 26a is arranged.

  A convex portion 6d is provided on the middle side surface of the cross bar 6 located in the upper housing 2, and the convex portion provided on the side surface of the cross bar 6 when the movable iron core 11 is sucked and the movable contact 7 and the fixed contact 4 come into contact with each other. By guiding the portion 6c with the positioning guide 26, the same effect as that of the electromagnetic contactor 91 of the first embodiment can be obtained.

  DESCRIPTION OF SYMBOLS 1 Lower housing, 2 Upper housing, 2a Guide hole, 3 Fixed contact, 3a Terminal screw, 4 Fixed contact, 5 External connection terminal, 6 Crossbar, 6a Base, 6b Square window, 6c Side surface, 6d Convex part, 7 Movable Contact, 8 Movable contact, 9 Push spring, 10 Electromagnetic actuator, 11 Movable iron core, 12 Exciting coil, 14 Fixed iron core, 15 Return spring, 16 Positioning guide, 16a Inclined surface, 16b Vertical surface, 26 Positioning guide, 26a Inclined Surface, 91, 92 Magnetic contactor.

Claims (3)

A plurality of pairs of fixed contacts having fixed contacts and fixed to the housing at a predetermined distance apart;
A plurality of movable contacts having a pair of movable contacts that contact / separate each of the fixed contacts at both ends;
A push spring that engages with the center of the movable contact at one end and presses the movable contact against the fixed contact;
A cross bar that supports the other end of the push spring and the central portion of the movable contact and has a movable iron core fixed to a pedestal provided at the base end;
An electromagnetic actuator that is disposed in the housing and includes a fixed core disposed so as to face the movable core, and displaces the cross bar to bring the movable contact into contact with and away from the fixed contact;
A positioning guide disposed in the housing, wherein the gap between the movable bar and the crossbar or the movable core becomes narrower as the movable core approaches the fixed core;
An electromagnetic contactor comprising:   2. The positioning guide according to claim 1, wherein the positioning guide has a gap between the cross bar and the movable iron core even when the distance between the cross bar and the movable iron core is the narrowest. Magnetic contactor.   The electromagnetic contactor according to claim 1, wherein the positioning guide or the crossbar base is formed of an elastic material.

Images