JP5419928B2 - Magnetic contactor - Google Patents

Description

  The present invention relates to an electromagnetic contactor that opens and closes an electric circuit by ON / OFF of an electromagnet.

  Conventionally, strip-shaped foreign matter inside the gas vent hole formed in the arc-extinguishing partition wall (cover between vertical walls) of the arc-extinguishing chamber cover (arc cover) in parallel with the arc-extinguishing partition wall and at an appropriate interval In a dustproof device for an electromagnetic contactor provided with an intrusion prevention wall, by making a rib around the surface of the foreign object intrusion prevention wall facing the extinguishing partition wall like a bank and making the facing surface with the arc extinguishing partition wall concave In addition, there is disclosed a dustproof device for an electromagnetic contactor that captures foreign matter that has entered through the vent hole in the recess and prevents the foreign matter from sliding off from the periphery of the foreign matter intrusion prevention wall due to opening / closing vibration of the magnetic contactor. (For example, refer to Patent Document 1).

  And an upper portion having a housing having at least two longitudinal walls in the front-rear direction, a terminal disposed at an upper portion between the vertical walls and facing the front of the housing, and a fixed contact disposed near a central portion between the vertical walls. A fixed contact, a lower fixed contact having a terminal disposed at a lower portion between the vertical walls and facing the front of the housing and a fixed contact disposed near a central portion between the vertical walls, and a center between the vertical walls A movable contact having a pair of movable contacts disposed on the upper and lower fixed contacts, a front cover covering between the vertical walls in front of the movable contact, and protruding from the front cover, An arc cover that is inserted between the vertical walls and has a pair of vertical wall covers extending to the center side ends of the respective terminals of the upper and lower fixed contacts, and covers the fixed contact and the movable contact. The magnetic contactor provided A groove for fitting the side portion of the cover between the vertical walls is provided in the vertical wall, and the front end portions of the pair of vertical wall covers are arranged at the back of the center side end portions of the respective terminals of the upper and lower stationary contacts. The upper surface of the cover between the vertical walls is provided with an inclined surface that is inclined downward from the side portion and the front end portion of the cover between the vertical walls toward the center portion of the cover between the vertical walls. When the minute foreign matter falls on the upper surface of the cover between the vertical walls, the minute foreign matter moves to the central portion of the cover between the vertical walls by the inclined surface, and therefore, between the side portion of the cover between the vertical walls and the groove of the vertical wall, and Even if there is a minute gap between the center side end of the terminal and the tip of the cover between the vertical walls, minute foreign matter can enter the electromagnetic contactor through the minute gap due to the opening / closing vibration of the magnetic contactor. There is no electromagnetic contactor with reduced contact continuity and electromagnet malfunction. That (for example, see Patent Document 2).

JP 05-002962 A JP 2006-310184 A

  However, according to the above-described conventional technology, foreign matter that enters from the extinguishing chamber cover (arc cover) can be confined, but foreign matter that enters from the gap between the stationary contact and the housing cannot be confined. For this reason, foreign matter that has entered the inside is diffused by the opening and closing vibration of the magnetic contactor, air convection due to opening and closing, vibrations of other control devices, etc. There is a problem that it is bitten in between and causes poor contact.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the electromagnetic contactor which can confine the foreign material which approached from the clearance gap between a stationary contact and a housing.

  In order to solve the above-described problems and achieve the object, the present invention is an electromagnetic contactor that is installed so that a crossbar holding a movable contact is displaced in a horizontal direction in a normal installation posture, A housing that houses the crossbar and the movable contact in a central portion, and a pair of fixed contacts that are disposed in the housing so as to sandwich the crossbar from above and below, and are fixed with a gap between the housing and the housing And a receiving groove that is formed in a range facing the gap of the cross bar and captures foreign matter falling from the gap.

  According to the present invention, it is possible to confine foreign matter that has entered through a gap between the stationary contact and the housing.

FIG. 1 is a front view showing an embodiment of an electromagnetic contactor according to the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cross-sectional view illustrating a foreign substance drop path in a non-energized state of the electromagnetic contactor according to the embodiment. FIG. 4 is a cross-sectional view illustrating a foreign substance dropping path in an energized state of the electromagnetic contactor according to the embodiment.

  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.

Embodiments.
1 is a front view showing an embodiment of an electromagnetic contactor according to the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is an electromagnetic contact of the embodiment. FIG. 4 is a cross-sectional view showing a foreign substance drop path in a non-energized state of the container, and FIG. 4 is a cross-sectional view showing a foreign substance drop path in an energized state of the electromagnetic contactor of the embodiment.

  As shown in FIGS. 1 to 4, the electromagnetic contactor 90 according to the embodiment includes a housing 10, a circuit opening / closing mechanism 20 accommodated and arranged in a central portion of the housing 10, and a circuit opening / closing mechanism 20 attached to the housing 10. And an electromagnetic actuator (not shown) that is attached to the housing 10 (on the right side in FIGS. 2 to 4) and operates the circuit opening / closing mechanism 20. The housing 10 and the cover 11 are formed of an insulating material reinforced with glass fiber. As shown in FIGS. 2 to 4, the electromagnetic contactor 90 according to the embodiment is installed inside a control panel or the like so that a later-described crossbar 22 is displaced in the horizontal direction as shown in FIGS. 2 to 4.

  The circuit opening / closing mechanism 20 includes a pair of fixed contacts 21, a cross bar 22, and a movable contact 23. The pair of fixed contacts 21 are each formed in a U shape, and are arranged and fixed to the housing 10 so that the opening is directed to the center and the cross bar 22 is sandwiched from above and below. A fixed contact 21c is fixed to the center of one piece 21a of the fixed contact 21, and a terminal screw 21d is attached to the other piece 21b. The electromagnetic contactor 90 according to the embodiment includes four pairs of fixed contacts 21.

  The cross bar 22 is disposed at the center of the housing 10 and is freely displaceable to the left and right in FIG. 2, and is driven by the electromagnetic actuator (not shown) to displace left and right (horizontal direction). The rectangular window 22a of the cross bar 22 has an elongated plate-like movable contact 23 having a pair of movable contacts 23a at both ends that come into contact with and separate from each of the fixed contacts 21c, and a central portion thereof at the bottom of the square window 22a. It is inserted and held so as to be positioned.

  The central portion of the movable contact 23 is engaged with one end of the contact spring 24. The contact spring 24 is slightly compressed, and the other end is engaged with the upper side of the square window 22a. 2 and 3 in which the electromagnetic actuator is not energized (open position), the movable contactor 23 is pressed against the bottom of the rectangular window 22a by the contact spring 24.

  Next, the operation of the electromagnetic contactor 90 will be described. When a current is passed through an exciting coil of an electromagnetic actuator (not shown), the crossbar 22 and the movable contact 23 are displaced to the right in FIG. 2, and the fixed contact 21c and the movable contact 23a are brought into contact as shown in FIG. The closed position is reached, and the electromagnetic contactor 90 is energized.

  When the current of the exciting coil is cut off, the crossbar 22 is displaced to the left by the return spring of the electromagnetic actuator, and as shown in FIG. 3, the fixed contact 21c and the movable contact 23a are disengaged to become an open position. The container 90 is in a non-energized state.

  Next, a characteristic configuration of the electromagnetic contactor 90 according to the embodiment will be described. There is a slight gap 10b between the piece 21a of the stationary contact 21 and the partition wall 10a of the housing 10 (in a mass-produced product such as the electromagnetic contactor 90, the dimensions of the individual parts are all the same. It is difficult to make the gap between the parts zero, and a slight gap 10b is inevitably formed between the resin molded product such as the housing 10 and the metal part such as the stationary contact 21).

  The gap 10b faces the top surface 10c direction of the housing 10 in the regular installation posture of the electromagnetic contactor 90 shown in FIGS. As shown in FIG. 3 and FIG. 4, when the insulating foreign material 30 falls on the top surface 10 c, the foreign material 30 becomes a gap due to opening / closing vibration of the electromagnetic contactor 90, vibration generated by other devices, and the flow of ambient air. 10b may be entered.

  As shown in FIG. 3, when the electromagnetic contactor 90 is in a non-energized state (open position), the foreign matter 30 that has entered the gap 10 b between the housing 10 and the stationary contact 21 falls into the housing 10 due to gravity. Go. As a characteristic configuration of the electromagnetic contactor 90 of the embodiment, the cross bar 22 includes a receiving groove in a range facing the gap 10b regardless of the closed position and the open position of the movable contact 23 and the fixed contact 21. 40 is formed.

  The receiving groove 40 includes a widened portion 40c having inclined surfaces 40a and 40b, and a narrow drop hole 40d formed at the bottom of the widened portion 40c. The widened portion 40c falls on the inclined surface 40b when the electromagnetic contactor 90 is energized (closed position) so that the foreign matter 30 falls on the inclined surface 40a when the electromagnetic contactor 90 is not energized (open position). In this way, the shape and dimensions are set.

  The foreign material 30 dropped into the widened portion 40c moves on the inclined surfaces 40a and 40b, is accommodated in the drop hole 40d, is trapped, and is captured. In the case of a small 10A class electromagnetic contactor 90, the drop hole 40d is formed to have a width of about 1 mm and a depth of about 3 mm, and once the foreign matter 30 falls into the drop hole 40d, the opening / closing vibration of the electromagnetic contactor 90, It does not jump out of the drop hole 40d due to vibration of other equipment.

  Further, during the opening / closing operation of the electromagnetic contactor 90, convection of air occurs inside the housing 10 due to the operation of the cross bar 22 and the movable contact 23, but the convection only passes through the widened portion 40c of the cross bar 22, The drop hole 40d is not affected by convection, and the foreign matter 30 does not jump out by convection.

  Further, the foreign matter 30 confined in the drop hole 40d is smaller than the gap 10b between the housing 10 and the stationary contact 21, and the drop hole 40d is filled with the foreign matter 30 until the life of the electromagnetic contactor 90 is reached. Never become. As described above, the foreign matter 30 entering from the outside is dropped and confined in the hole 40d, so that the probability that the foreign matter 30 adheres to the fixed contact 21c and the movable contact 23a is reduced, and the contact failure of the electromagnetic contactor 90 is reduced. Can be reduced.

DESCRIPTION OF SYMBOLS 10 Housing 10a Partition wall 10b Clearance 10c Top surface 11 Cover 20 Circuit open / close mechanism 21 Fixed contact 21a One piece 21b Other piece 21c Fixed contact 21d Terminal screw 22 Crossbar 22a Square window 23 Movable contact 23a Movable contact 24 Contact spring 30 Foreign object 40 Receiving groove 40a, 40b Inclined surface 40c Widened portion 40d Pit hole 90 Electromagnetic contactor

Claims (2)

In the normal installation posture, an electromagnetic contactor installed so that the crossbar holding the movable contact is displaced in the horizontal direction,
A housing that houses the crossbar and the movable contact in a central portion;
A pair of fixed contacts arranged in the housing so as to sandwich the crossbar from above and below, and fixed with a gap between the housing,
A receiving groove that is formed in a range facing the gap of the crossbar and captures foreign matter falling from the gap;
An electromagnetic contactor comprising:   The receiving groove includes a widened portion widened to face the gap regardless of whether the cross bar is displaced to a closed position or an open position of the movable contact and the fixed contact, and a bottom of the widened portion. The electromagnetic contactor according to claim 1, further comprising a narrow pit formed to confine the foreign matter.

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