JPH0521290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to vibration prevention of a movable iron core when turning on an electromagnetic contactor, particularly an electromagnetic contactor with an additional auxiliary contact unit.

[Conventional technology]

Figure 5 is a partially cutaway side view of a conventional electromagnetic contactor. 3 is a fixed core made of laminated silicon steel plates, 4 is an operating coil wound around the center leg of the fixed core 3, and 5 is provided with a predetermined gap from the fixed core 3 by a tripping spring (not shown). 6 is an insulating crossbar connected to the movable core 5 via a pin 7, and 8 is a movable core disposed in a holding hole 62 provided in the head 61 of the crossbar 6. The contact element 9 is a contact spring that pressurizes the movable contact element 8 via the spring receiver 10, and the reference numeral 11 is a fixed contact element mounted on the base 2 facing the movable contact element 8. The gap between the movable core 5 and the fixed contact 11 is smaller than the gap between the movable core 5 and the fixed core 3.

In the electromagnetic contactor configured as described above, by applying a driving voltage to the operating coil 4 and energizing it, the movable core 5 is attracted to the fixed core 3, and at the same time, the crossbar 6 connected to the movable core 5 is also drawn to the fixed core 3 side. Move to. Due to this movement of the crossbar 6, the movable contact 8 comes into contact with the fixed contact 11, and a predetermined contact pressure is applied by the contact spring 9.

When the drive voltage applied to the operating coil 4 is removed, the movable core 5 moves in the opposite direction to the fixed core 3 due to the force of the tripped spring, and the movable contact 8 also separates from the fixed contact 11.

When using the electromagnetic contactor constructed as described above, the normal mounting state is such that the movable contactor 8 faces vertically, as shown in the explanatory view of FIG.

In the conventional electromagnetic contactor, in the open state shown in FIG. 6, the upper contact surface 21 and lower contact surface 22 of the base 2, which the side surface 63 of the cross bar 6 contacts, are on the same vertical plane. The cross bar 6 is horizontal, and the head 61 and movable iron core 64 of the cross bar 6 are located at the receiving surface 23 on the lower side of the base 2, respectively.
24 is a sliding surface. Note that 12 is a tripping spring, and 14 is a buffer rubber.

From this state, when the movable core 5 begins to be attracted to the fixed core 3 by excitation of the operating coil 4 as shown in FIG. The movable core 5 rotates clockwise due to friction with the side receiving surface 24. For this reason, the movable iron core 5 collides with the fixed iron core 3 in an inclined state, resulting in uneven contact between the two iron cores, causing uneven wear of both iron cores, and shortening the life of the iron core.

Further, when the cross bar 6 is opened, the impact caused by the side surface 63 of the cross bar 6 hitting the upper and lower contact surfaces of the base 2 causes the b contact of the auxiliary contact to rebound.

To solve this problem with conventional electromagnetic contactors, during suction, the movable core side of the crossbar slides on the receiving surface of the base on the gravity direction side, and the head side of the crossbar slides on the receiving surface of the base on the side opposite to the gravity direction. By sliding on the surface, the crossbar and movable iron core are moved horizontally, and by providing steps on the upper and lower contact surfaces of the base that the side surfaces of the crossbar contact when opened, the crossbar moves counterclockwise when opened. It is known to rotate and stand still to buffer the impact when opening.

8 and 9 are explanatory diagrams of the operation of the electromagnetic contactor according to the above proposal, and the same reference numerals as in the above conventional example indicate the same parts.

25 is the head 6 of the crossbar 6 in the suction state
1 is the receiving surface of the sliding base, A is the crossbar 6
The side surface 63 shows a step between the upper abutting surface 21 and the lower abutting surface 22 of the base that come into contact when the base is opened, and the lower abutting surface 22 protrudes from the upper abutting surface 21 by the dimension A.

In the open state of the electromagnetic contactor, as shown in FIG. 8, the side surface 63 of the cross bar 6 contacts the upper contact surface 21 and lower contact surface 22 of the base, and the cross bar 6 and the movable iron core 5 are tilted from the horizontal. is in a state of

When voltage is applied to the operation coil 4 and the movable core 5 is attracted to the fixed core 3, the crossbar 6 starts to move from the above-mentioned tilted state, and the movable core portion 64 of the crossbar 6 and the receiving surface 24 of the base Due to friction, gravity, etc. acting on the movable iron core 5, the cross bar 6
rotates clockwise during suction, and slides on the receiving surface 24 of the base of the movable core 64 of the cross bar 6 in the gravity direction, as shown in FIG. 9, and the head 61 of the cross bar 6 rotates in the gravity direction. The crossbar 6 and movable core 5 are moved horizontally by sliding on the opposite base receiving surface 25. Therefore, the movable core 5 is parallel to the fixed core 3 to prevent uneven contact.

In addition, when opening, as shown in FIG. 8, the side surface 63 of the cross bar 6 first hits the lower contact surface 22 of the base, and then the cross bar 6 rotates counterclockwise.
It rests against the upper contact surface 21 of the base. This rotation of the crossbar 6 can provide complete buffering during opening, and prevent the b contact from bouncing back.

[Problem that the invention seeks to solve]

In the electromagnetic contactor configured as described above, as shown in the schematic diagram of FIG.
When an additional auxiliary contact unit having an auxiliary movable contact 71 and an auxiliary fixed contact 72 is connected, the head 61 of the crossbar 6 becomes heavy, so the crossbar 6 must be completely horizontal before the contacts start to make contact during suction. Move in a tilted position.

Since contact pressure is generated between the contacts, a force is applied to the auxiliary crossbar 70 in the direction opposite to the direction of the fixed iron core 3, and the connecting portion 15 between the auxiliary crossbar 70 and the crossbar 6 is fixed in that state, and the crossbar 6
moves in a tilted position with the movable core side facing upward.

For this reason, as shown in FIG. 11, the lower contact surface of the movable core 5 hits the lower contact surface of the fixed core 3 first, creating a gap between the upper contact surfaces, and the movable core 5 is either held as it is or remains in place for a long time. There is a problem in that time oscillations occur and chatter noise is generated.

Furthermore, since the movable iron core 5 and the fixed iron core 3 touch unevenly, a problem arises in that uneven wear of the iron core occurs.

The present invention was made to solve these problems, and an object of the present invention is to provide an electromagnetic contactor that has a simple structure and can prevent vibrations during suction and uneven wear of the iron core.

[Means for solving problems]

In the electromagnetic contactor according to the present invention, a step is provided on the surface of the mounting base that holds the fixed core, and the upper surface is higher than the lower surface with respect to the direction of gravity in the normally installed state, and the cushioning rubber is mounted on the higher surface of the upper surface. The fixed iron core is held through it.

[Effect]

In this invention, when the lower armature surface of the movable core comes into contact with the lower contact surface of the fixed core, the fixed core rotates around the fulcrum formed by the step of the mounting base, so that the movable core and the fixed core are immediately connected to each other. Both the upper and lower electrode surfaces of the electrode are in close contact with each other.

〔Example〕

FIG. 1 is a partial cross-sectional view showing one embodiment of the present invention, and in the figure, 1, 3, 4, and 14 indicate the same parts as in the conventional example. Reference numeral 15 denotes a protrusion that constitutes a step provided on the surface of the mounting base 1 that holds the fixed core 3. The protrusion 15 is used when the electromagnetic contactor is normally mounted, that is, when the electromagnetic contactor is mounted on an upright mounting plate (not shown). It is provided on the upper surface in the direction of gravity when the contactor is attached. This protrusion 15 and the operating coil 4
The fixed core 3 is attached to the protrusion 1 via the buffer rubber 14.
It is rotatably held using the corner of 5 as a fulcrum.
Further, 80 is a fixed core abutting surface of the operating coil 4 on the opposite side from the mounting base 1 of the fixed core 3. The protrusion 15 of the mounting base 1 is located above the fixed core abutting surface of the operating coil 4.

The operation of the electromagnetic contactor configured as described above is
This will be explained based on the operation explanatory diagrams shown in FIGS. When voltage is applied to the operating coil 4, the movable core 5 is attracted to the fixed core 3 in an inclined state as shown in FIG. The movable iron core 5 and the lower armature surfaces of the fixed iron core 3 collide with each other. Due to this collision of the lower armature, the fixed core 3 rotates counterclockwise around the corner fulcrum 16 of the protrusion 15 of the mounting base 1, as shown in FIG. 3, and the lower side of the fixed core 3 escapes, causing the lower part The impact on the armature surfaces is buffered, and both the upper and lower armature surfaces of the movable iron core 5 and the fixed iron core 3 are in close contact with each other.

In this state in which both the armature surfaces are in close contact with each other, the movable iron core 5 and the fixed iron core 3 are placed in a horizontal state as shown in FIG. 4 due to the reaction force caused by the rotation of the upper and lower fixed iron cores 3.

The time from when the lower armature surface of the movable core 5 collides with the lower armature surface of the fixed core 3 until both the upper and lower armature surfaces come into close contact is very short, making it possible to prevent the vibration of the movable core 3. It is also possible to prevent the occurrence of crackling noise.

〔Effect of the invention〕

As explained above, this invention is provided on the surface of the mounting base that holds the fixed core when the lower armature surface of the movable core hits the lower armature surface of the fixed core in the normal installation state. When the fixed core is properly installed, the fixed core rotates around the corner of the step where the upper side is higher than the lower side in the direction of gravity, so the impact force when the movable core is attracted to the fixed core is reduced. It can buffer and prevent uneven wear of the iron core due to uneven contact.

Furthermore, since it only requires a step on the mounting base,
The production cost is low and assembly is easy.
Since the fixed core rotates using the corner of the step as a fulcrum, the wear of the corner, which is a linear support, is slower than in conventional single-point support, resulting in a longer service life.

Furthermore, by rotating the fixed iron core, both the upper and lower armature surfaces of the movable iron core and the fixed iron core can be brought into close contact immediately, so vibration of the movable iron core can be prevented, and chattering noise when the iron is turned on can be prevented. It also has the effect of If the protrusion of the mount is located above the fixed core abutting surface of the operating coil, the effect will be enhanced.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the present invention;
Figures 2, 3, and 4 are explanatory diagrams of the operation of the above embodiment, Figure 5 is a partially cutaway side view of a conventional electromagnetic contactor, and Figures 6 and 7 are 8 and 9 are explanatory diagrams of the operation of a conventional electromagnetic contactor, respectively, and FIGS.
Figure 0 is a schematic configuration diagram of the electromagnetic contactor, Figure 11 is the first
FIG. 2 is an explanatory diagram of the operation of the electromagnetic contactor shown in FIG. 1...Mounting base, 3...Fixed core, 4...Operation coil, 5...Movable core, 14...Buffer rubber, 15
...Protruding part of the mounting base. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. Steps are provided on the upper and lower contact surfaces of the base against which the side surfaces of the crossbar come into contact when the crossbar is opened in the normally installed state, so that the crossbar rotates and stands still when the crossbar is opened, and the head of the crossbar is In an electromagnetic contactor to which an auxiliary crossbar can be connected, one side of the mount that holds the fixed core is attached to the surface of the mounting base that holds the fixed core, from the bottom to the top in the direction of gravity in the above-mentioned normal installation state. An electromagnetic contactor characterized in that a step with a raised surface is used, and a fixed iron core is rotatably held by the step and an operating coil via a buffer rubber using a corner of the step as a fulcrum. 2 The upper step that holds the fixed core of the mounting base is
The electromagnetic contactor according to claim 1, wherein the electromagnetic contactor is located above the contact surface of the fixed core of the operating coil.