JP2008034238A - Contact switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a contact switch in which contact wear is reduced by suppressing generation of a contact arc. <P>SOLUTION: In the contact switch, the side faces 9e, 1e which are in parallel with the attracting direction of a movable iron core and which are mutually opposed and not attracted, and contacting pole faces 9d, 9g, 1d, 1g which are mutually attracted perpendicularly or nearly perpendicularly to the attraction direction of the movable iron core are formed in the movable iron core and a fixed iron core. Immediately before movable points 11 at attraction of the movable iron core 9 come into contact with fixed contacts 5, areas and spacings of the opposing side faces 9e, 1e and the contacting pole faces 9d, 9g, 1d, 1g are set so that magnetic resistance between the side faces of the opposing side faces 9e, 1e becomes lower than the magnetic resistances between the contacting pole faces of the contacting pole faces 9d, 9g, 1d, 1g. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a contact switch.

  As an electromagnetic device for a conventional contact switch, an electromagnetic coil, a fixed iron core (nominal iron) that has a suction surface and is excited by the electromagnetic coil, and a fixed iron core that has a facing surface opposite to the suction surface are excited by the electromagnetic coil. And a movable iron core (plunger) that separates the attraction surface and the opposing surface by a return spring when the excitation is released, and the opposing surface is attracted to and attracted to the attraction surface. There is one in which a convex portion is formed on one of the surfaces and a concave portion in which the convex portion is loosely fitted is formed on the other (see, for example, Patent Document 1).

  The conventional electromagnet device can easily obtain an initial attractive force, and at the same time, can suppress an increase in the attractive force immediately before the adsorption of the movable iron core, and can reduce the impact force at the time of adsorption between the movable iron core and the fixed iron core. There is an effect.

Japanese Utility Model Laid-Open No. 5-18055 (pages 6 to 7, FIGS. 1 to 4)

  However, according to the above conventional technique, the impact force at the time of adsorption between the movable iron core and the fixed iron core can be reduced, but the contact bounce of the movable contact of the contact switch operated by the movable iron core cannot be suppressed. . Therefore, there has been a problem that the generation of arc between contacts cannot be suppressed.

  This invention is made in view of the above, Comprising: It aims at obtaining the contact switch which suppresses generation | occurrence | production of the arc between contacts and reduces contact wear.

  In order to solve the above-described problems and achieve the object, the contact switch of the present invention supports the fixed iron core excited by the electromagnetic coil and the other end of the contact spring that supports the movable contact at one end, and A movable iron core that is attracted and adsorbed to the fixed iron core when the iron core is excited and returned by a return spring when de-energized, and a fixed contact that contacts and separates from the movable contact by excitation and non-excitation of the fixed iron core and movable iron core And opening and closing a contact that contacts the movable contact with the fixed contact and compresses the contact spring by a predetermined compression distance to press the movable contact against the fixed contact by exciting the fixed iron core and the movable iron core. A side surface that is parallel to the suction direction of the movable iron core, is opposed to each other and is not attracted, and a contact surface that is attracted to each other perpendicularly or substantially perpendicular to the suction direction of the movable iron core, Immediately before the movable contact comes into contact with the fixed contact, when the movable iron core is attracted to the fixed iron core and the movable iron core, the side-to-side magnetic resistance between the opposing side surfaces is the armature between the armature surfaces. The areas and intervals of the opposing side surfaces and the contact surface are set so as to be less than the inter-surface magnetic resistance.

  According to the present invention, it is possible to obtain a contact switch that suppresses contact bounce by suppressing the speed of the movable contact immediately before the movable contact and the fixed contact contact, and suppresses the generation of arc between the contacts and reduces contact wear. There is an effect.

  Embodiments of a contact switch 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 FIG. 1 is a longitudinal cross-sectional view showing a contact switch according to an embodiment of the present invention when an electromagnetic coil is not energized, and FIG. 2-1 is a movable contact when the electromagnetic coil is energized to attract the movable iron core. FIG. 2-2 is an enlarged view of a part A in FIG. 1 showing a state before contact with the fixed contact, and FIG. 2-2 shows a state before the electromagnetic coil is energized to attract the movable iron core and the movable contact contacts the fixed contact. 1 is an enlarged perspective view of part A of FIG. 1, FIG. 3 is an enlarged perspective view of part A of FIG. 1 showing a state after the movable contact contacts the fixed contact, and FIG. FIG. 5 is a magnetic force characteristic diagram showing the relationship between the resistance of the spring and the repulsive force, and FIG. is there.

  As shown in FIG. 1, the contact switch 100 includes a rear case 3 on which the fixed iron core 1 and the electromagnetic coil 2 are installed, and a front case 4 that houses contacts and covers the rear case 3. Become. In the middle of the front case 4, fixed contacts 5, 5 are fixed to the inner end, and a pair of fixed contacts 7, 7 having terminal screws 6, 6 on the outer end and serving as external connection terminals are separated by a predetermined distance. And fixed.

  A movable contact support 8 is installed between the pair of fixed contacts 7, 7, that is, in the center of the contact switch 100. The outer end of the movable contact support 8 is guided in the guide hole 4a of the front case 4 and can move in the vertical direction in the figure. A movable iron core 9 is attached to the inner end of the movable contact support 8.

  A fixed iron core 1 in which a winding frame 2 a around which an electromagnetic coil 2 is wound is fitted and inserted into the central magnetic pole 1 a is installed in the back side case 3. Between the flange on the front side of the reel 2a and the concave portion of the movable iron core 9, the fixed iron core 1 and the movable iron core 9 are moved away from each other when the electromagnetic coil 2 is not energized (when the fixed iron core 1 is not energized). A return spring 10 wound in a conical shape for returning the iron core 9 is mounted.

  In the rectangular hole 8a of the movable contact support 8 that faces in the left-right direction in the figure, there is an elongated plate-like movable contact 12 provided with movable contacts 11 and 11 that contact and separate from the fixed contacts 5 and 5, respectively. The central portion is inserted and supported so as to be positioned in the square hole 8a. A spring receiver 12a is fixed to the front side of the center of the movable contact 12, and the movable contact 12 is engaged with one end of the contact spring 13 via the spring receiver 12a and supported by the contact spring 13.

  The contact spring 13 is slightly compressed, and the other end is supported on the front surface of the square hole 8a. In this way, the other end of the contact spring 13 and the central portion of the movable contact 12 are supported by the movable contact support 8. In principle, the other end of the contact spring 13 that supports the movable contacts 11, 11 at one end is supported by the movable iron core 9.

  The fixed iron core 1 and the movable iron core 9 are formed in a trifurcated shape, and each have a central magnetic pole 1a, 9a and two side magnetic poles 1b, 1b, 9b, 9b facing each other. Bearer coils 1c and 1c are mounted on the attracting surfaces of the side magnetic poles 1b and 1b of the fixed iron core 1, respectively.

  As shown in FIG. 2A, the attraction surface of the central magnetic pole 1a of the fixed iron core 1 has side surfaces 1e and 1e parallel to the attraction direction (vertical direction in the drawing) of the movable iron core 9, and perpendicular to the side surfaces 1e and 1e ( A concave portion 1f having a bottom surface (contact surface) 1d and edge surfaces (contact surfaces) 1g, 1g, which may be inclined (substantially perpendicular), is formed. Further, on the surface facing the central magnetic pole 9a of the movable iron core 9, side surfaces 9e and 9e parallel to the attracting direction of the movable iron core 9, and end surfaces (contact surfaces) 9d and edges perpendicular (substantially perpendicular) to the side surfaces 9e and 9e. Convex portions 9f having surfaces (contact surfaces) 9g and 9g and loosely fitting into the concave portions 1f are formed.

  As shown in FIG. 1, when the electromagnetic coil 2 is not energized and de-energized, the movable contact 12 is pressed against the back surface of the square hole 8 a by the contact spring 13. Further, the contact surface 8 b of the movable contact support 8 is in contact with the contact surface 4 b of the front case 4 by the return force of the return spring 10.

  In the contact switch 100 according to the embodiment, the distance between the fixed contacts 5 and 5 and the movable contacts 11 and 11 in the non-excited state is 3.3 mm, and the attracting surface (contact surface) of the fixed core 1 1d, 1g, 1g) and the distance between the cores of the opposed surfaces of the movable iron core 9 (contact surface 9d, 9g, 9g) is 4.9 mm, and the depth of the concave portion 1f (= height of the convex portion 9f) Is 5 mm.

  In addition, the electromagnetic coil 2 is energized to excite the fixed iron core 1, the movable iron core 9 is attracted to the fixed iron core 1, and the movable contact support 8 is driven, and the movable contacts 11 and 11 come into contact with the fixed contacts 5 and 5. After that, the compression distance (contact wiping amount) C of the contact spring 13 until the facing surface (contact surface) of the movable core 9 is attracted to the suction surface (contact surface) of the fixed core 1 is 1.6 mm. The side surface distance between the side surface 1e of the concave portion 1f of the fixed iron core and the side surface 9e of the convex portion 9f of the movable iron core 9 is 1.4 mm.

  Next, referring to FIG. 1 to FIG. 5, the operation of the contact switch 100 according to the embodiment formed in the above dimensions and the areas and intervals of the side surfaces 1 e and 9 e, the contact surfaces 1 d, 1 g, 9 d, and 9 g. The setting of will be described.

  When the electromagnetic coil 2 shown in FIG. 1 is changed from a non-energized state to an energized state, the fixed iron core 1 is excited and generates an attractive force of about 3N with respect to the movable iron core 9 as shown in FIG. Since the return force of the return spring 10 is about 2.3 N, the movable iron core 9 is attracted toward the fixed iron core 1 together with the movable contact support 8 against the return spring 10.

  The movable iron core 9 is attracted in the direction of the fixed iron core 1, and the interval between the contact surfaces of the iron core (the interval between the contact surfaces 9d and 9g of the projection 9f and the contact surfaces 1d and 1g of the recess 1f) G is a contact spring. Before the compression distance 13 (wiping amount of the contact) C = 1.6 mm (before the movable contacts 11 and 11 come into contact with the fixed contacts 5 and 5), as shown in FIGS. The side surfaces 1e and 9e and the armature surfaces 1d and 1g so that the inter-side surface magnetic resistance between the side surface 9e of the convex portion 9f of the movable iron core 9 and the side surface 1e of the concave portion 1f of the fixed core is lower than the inter-electrode surface magnetic resistance. , 9d and 9g are set to have an area and interval, and most of the magnetic flux M flows between the side surfaces 1e and 9e and does not work as an attractive force for the movable iron core 9.

  For the above reason, the attraction force between the iron cores, which normally increases in a quadratic function, increases in a region P before the movable contacts 11 and 11 come into contact with the fixed contacts 5 and 5 as shown in FIG. As a result, the drive speed of the movable iron core 9 can be suppressed, which can reduce contact bounce at the time of contact collision, reduce the number of arcs generated by contact bounce, and reduce the amount of contact consumption due to arcs. To do.

  When the movable iron core 9 approaches the fixed iron core 1 and the contact surface spacing G of the iron core is equal to or less than the compression distance of the contact spring 13 (contact wiping amount) C = 1.6 mm or less, the movable contacts 11, 11 become the fixed contact 5, 5, the repulsive force against the attractive force of the movable iron core 9 becomes the repulsive force of the return spring 10 + the repulsive force of the contact spring 13, and rapidly increases as shown in FIG. 4, but as shown in FIG. After the movable contacts 11 and 11 come into contact with the fixed contacts 5 and 5, the area of the side surfaces 1 e and 9 e and the contact surfaces 1 d, 1 g, 9 d, and 9 g is set so that the inter-side magnetic resistance exceeds the inter-contact surface magnetic resistance. As shown in FIG. 3, the magnetic flux M that has been set between the gaps and flows between the side surfaces almost flows between the contact surfaces, so that the attractive force between the iron cores increases rapidly, It becomes larger than the reaction force of the return spring 10 + the reaction force of the contact spring 13, and the movable iron core 9 is fixed. Adsorbed to the core 1.

  As described above, when the contact force that does not require an excessive suction force is suppressed, the suction force is suppressed, and after the contact contact, when the reaction force of the contact spring 13 is applied and the reaction force increases rapidly, ensure a sufficient suction force. Yes.

  In the contact switch 100 according to the embodiment, the concave portion 1 f is formed on the suction surface of the fixed core 1 and the convex portion 9 f is formed on the opposite surface of the movable core 9. However, the convex portion is formed on the suction surface of the fixed core 1. It is also possible to form a recess on the opposing surface of the movable iron core 9.

  As described above, the contact switch according to the present invention reduces the amount of contact consumption due to arc and is useful as a long-life contact switch.

It is a longitudinal cross-sectional view which shows the time of the electromagnetic coil non-energization of embodiment of the contact switch of this invention. FIG. 2 is an enlarged view of a portion A in FIG. 1 showing a state before an electromagnetic coil is energized to attract a movable iron core and a movable contact contacts a fixed contact. FIG. 2 is an enlarged perspective view of a portion A in FIG. 1 showing a state before an electromagnetic coil is energized to attract a movable iron core and a movable contact contacts a fixed contact. It is the A section expansion perspective view of Drawing 1 showing the state after a movable contact contacts a fixed contact. It is an attractive force characteristic diagram which shows the relationship between the attractive force of a movable iron core, and the repulsive force by a spring. It is a magnetoresistive characteristic diagram which shows the relationship between the armature surface gap of an iron core, the magnetoresistance between armature surfaces, and the magnetoresistance between side surfaces.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed iron core 1a Center magnetic pole 1b Side part magnetic pole 1c Bear coil 1d Bottom face (contact surface)
1e Side surface 1f Recessed portion 1g Edge surface (contact surface)
DESCRIPTION OF SYMBOLS 2 Electromagnetic coil 2a Winding frame 3 Back side case 4 Front side case 4a Guide hole 4b Contact surface 5 Fixed contact 6 Terminal screw 7 Fixed contact 8 Movable contact support 8a Square hole 8b Contact surface 9 Movable core 9a Central magnetic pole 9b Side magnetic pole 9d End face (contact surface)
9e Side surface 9f Convex part 9g Edge surface (contact surface)
DESCRIPTION OF SYMBOLS 10 Return spring 11 Movable contact 12 Movable contact 12a Spring receiver 13 Contact spring 100 Contact switch C Contact spring compression distance (contact wiping amount)
G Distance between contact surfaces of the iron core M Magnetic flux P Area before the movable contact contacts the fixed contact

Claims (2)

A fixed iron core excited by an electromagnetic coil;
A movable iron core that supports the other end of the contact spring that supports the movable contact at one end, is attracted and adsorbed to the fixed iron core when the fixed iron core is excited, and is returned by a return spring when de-energized.
A fixed contact that contacts and moves away from the movable contact by excitation and non-excitation of the fixed core and the movable core;
A contact switch for contacting the movable contact with the fixed contact and compressing the contact spring by a predetermined compression distance to press the movable contact against the fixed contact by exciting the fixed iron core and the movable iron core. ,
Side surfaces that are parallel to the suction direction of the movable iron core, are opposed to each other and are not attracted, and contact surfaces that are attracted to each other perpendicularly or substantially perpendicular to the suction direction of the movable iron core are formed on the fixed iron core and the movable iron core. ,
At the time of attracting the movable iron core, just before the movable contact comes into contact with the fixed contact, the side-to-side magnetoresistance between the opposing side surfaces is less than the magnetoresistance between the contact surfaces. 2. A contact switch according to claim 1, wherein an area and a distance between the opposing side surfaces and the contact surface are set.   The said opposing side surface is a side surface of the convex part formed in one of the said movable iron core or a fixed iron core, and the side surface of the recessed part which is formed in the other and loosely fits the said convex part. Contact switch.

Images