JPS6326903Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a return prevention device for a movable element in an electromagnetic contactor.

[Conventional technology]

An electromagnetic contactor generally consists of a casing made of an insulator, a terminal plate fixed to the casing and provided with a fixed contact at one end, a movable contact that opens and closes the fixed contact of the terminal plate, and a movable contact that holds the movable contact. A movable element to be moved, a movable iron core to which the movable element is moved, a fixed iron core that attracts the movable iron core, a coil frame around which an excitation coil that excites the fixed iron core is wound, and a connection between the coil frame and the movable element. A repulsion spring is interposed between the movable contact and the fixed contact to urge the movable element in a direction in which the movable contact opens more than the fixed contact when not energized, and the movable element is provided with a b contact that closes when not energized. There is.

FIG. 2 shows an example. In FIG. 2, the casing 5 has an auxiliary b fixed contact terminal 7.
and an auxiliary fixed contact terminal 10 are provided,
The auxiliary b movable contact 6 and the auxiliary a which come into contact with and separate from the auxiliary b fixed contact terminal 7 and the auxiliary a fixed contact terminal 10
A movable contactor 9 is attached to the armature 1 with the intervention of pressure springs 8 and 8'.

[Problem that the invention attempts to solve]

In an electromagnetic contactor equipped with this b contact (auxiliary b movable contact 6), when the excitation coil is demagnetized from the closed state of the movable contact to the open state, the movable element 1 suddenly moves due to the restoring force of the repulsion spring. The movable element rises and collides with the inner upper wall surface of the casing 5, and the movable element returns due to the reaction force. Due to this return, the above-mentioned b contact jumps, and there is a possibility that the b contact that once made contact may open once.

The present invention solves such conventional problems by forming a taper on the collision surface between the casing and the movable element, and the tapered surface collides with the movable element before colliding with the inner upper wall surface of the casing. The purpose of this is to eliminate the return of the movable element and prevent the jump of the b contact.

[Means for solving problems]

In order to achieve this objective, the mover return prevention device in the electromagnetic contactor of the present invention is driven in the vertical direction by the movable core of the electromagnet housed in the electromagnetic contactor casing, and A movable element that brings a movable contact into contact with a fixed contact when the movable iron core is attracted, and separates the movable contact from the fixed contact with the restoring force of a repulsion spring due to demagnetization of the fixed iron and closes the B contact. In the electromagnetic contactor, a tapered stopper is formed on the inner surface of the casing with which the movable element collides during demagnetization, and the tapered stopper is inclined with respect to the moving direction of the movable element, and the movable element has an inner upper wall surface of the casing. The present invention is characterized in that a tapered portion is formed that slides into contact with the tapered surface of the tapered stopper before colliding with the tapered stopper.

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

FIG. 1 is a sectional view showing the overall configuration of an embodiment of an electromagnetic contactor equipped with a mover return prevention device according to the present invention. FIG. 2 is a side sectional view of the portion of the auxiliary b movable contact 6 in FIG. 1. In these figures, 1 is a movable element made of an insulating material, and 2 is a movable iron core. The movable element 1 and the movable iron core 2 are connected by a connecting pin 3 with a spring 4 interposed therebetween. 5 is a casing made of an insulating material. As shown in FIG. 2, an auxiliary B movable contact 6 and an auxiliary A movable contact 9 are attached to the movable element 1 via pressing springs 8 and 8', respectively. On the casing 5 side, an auxiliary b movable contact 6 and an auxiliary a
An auxiliary B fixed contact terminal 7 and an auxiliary A fixed contact terminal 10 are provided to move toward and away from the movable contact 9, respectively.

Returning to FIG. 1, a movable contact 11 is provided on the upper part of the movable element 1 so as to move toward and away from a terminal plate 12. A fixed iron core 13 that performs a magnetic attraction action on the movable iron core 2 is provided below inside the casing 5.
And an excitation coil 14 that excites the fixed iron core 13 is arranged. The fixed core 13 is connected via a fixing pin 20 to a core receiving box 17 that is fixed by welding or the like to a base plate 16 that covers the bottom of the casing 5 . A spacer 18 and a cushioning rubber seat 19 are interposed between the core receiving box 17 and the bottom of the fixed core 13 to absorb the impact when the movable core 2 is attracted. The thickness or number of spacers 18 is adjusted so that the degree of buffering is optimized.

The excitation coil 14 is wound around a coil frame 22, and is movably attached via a coil spring 23 to a coil spring seat 21 which also serves to prevent the connecting pin 20 from coming off.
Furthermore, a repulsion spring 15 is provided at the upper part of the coil frame 22 to provide a repulsion force to the movable element 1 when it is separated. In the figure, 24 is a voltage display plate made of thermoplastic resin.

In the present invention, as shown in FIG. 1, a tapered stopper 5b is provided on one side surface connected to the inner upper wall surface 5a of the casing 5, which is the left side surface in this embodiment, and a tapered stopper 5b is provided on one shoulder of the movable element 1. In this embodiment, a tapered portion 1e is formed on the left shoulder portion so as to come into sliding contact with the tapered stopper 5b. Therefore, when the excitation coil 14 is demagnetized, the movable element 1 rises rapidly due to the restoring force of the repulsion spring 15 and collides with the inner upper wall surface 5a of the casing 6, but prior to this collision, The tapered portion 1e formed on the movable element 1 first comes into contact with the tapered stopper 5b. At this time, the other shoulder, ie, the right shoulder, of the movable element 1 still rises and rotates using the contact shoulder, ie, the left shoulder, as a fulcrum, and the left shoulder also slides obliquely upward along the tapered surface. Therefore, in the collision at this stage, a considerable portion of the separation momentum caused by the biasing of the repulsion spring 15 of the movable element 1 remains, and the consumed momentum is suppressed. Moreover, since the remaining momentum is gradually consumed by the frictional resistance of sliding on the tapered surface, the impact that the movable element 1 receives at one time can be suppressed to a low level. Furthermore, the tapered surface divides the vertical force of the impact force into a horizontal direction, thereby making the vertical impact even smaller. At this stage, the rising speed of the mover 1 is considerably reduced. Next, the left shoulder portion slides on the tapered portion 1e, the right shoulder portion rotates and moves upward, and the right shoulder portion collides with the casing upper wall surface 5c. At this time, the left shoulder still continues to slide along the tapered surface, and the right shoulder slides horizontally along the casing upper wall surface 5c. The impact caused by the collision of the right shoulder is small because the rising speed of the mover 1 is decreasing and the upward movement due to the sliding of the left shoulder continues, so the amount of momentum consumed is small and the impact is small. . In this way, the sliding movement along the tapered surface of the left shoulder continues, and the mover 1 moves toward the right in FIG. However, the right side of the mover 1 finally collides with the side of the casing 5, leaving a slight gap between the upper surface of the left shoulder and the inner upper wall surface 5c of the casing 5, and the mover 1 moves. It stops tilting slightly counterclockwise and enters a stable open state. At this time,
The right shoulder receives no upward impact force only in the horizontal direction, and the left shoulder is also tapered and receives only the upward component of the impact force.Moreover, the moving speed of the mover 1 is also small, so the impact force is reduced. The whole is kept extremely low,
The impact force that the mover 1 receives is small. In this way, after colliding with the casing 5 in multiple stages, it is settled in a stable position, so that the impact is not concentrated all at once but is dispersed over time, so that the peak value of the impact can be significantly reduced.

In addition, a step 5c is provided on the other side of the internal upper wall surface 5a of the casing 5, and the step 5c is located below the internal upper wall surface 5a, and the mover 1 is temporarily received here.
If the impact is buffered by the taper portion after the movable element 1 is tilted, the impact can be further absorbed.

[Effect of idea]

As described above, according to the present invention, the impact on the upper wall surface inside the casing of the mover when the excitation coil is demagnetized is temporarily absorbed by the taper formed on both sides, and both shoulders of the mover are prevented from shifting over time. When it collides with the casing, one shoulder first collides with the taper stopper surface, and then repeats small collisions while sliding on that surface, gradually reducing the momentum and dispersing the impact in multiple stages. is alleviated. As a result, the conventional problem that the b contact opens once it contacts can be solved, and the operation of the electromagnetic contactor can be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the electromagnetic contactor according to the present invention, and FIG. 2 is a partially cutaway side view showing an embodiment of the electromagnetic contactor equipped with an auxiliary contactor. 1: Movable element, 2: Movable iron core, 5: Casing,
1e: Tapered part, 5a: Upper wall surface inside the casing,
5b: Tapered stopper, 5c: Step, 6: Auxiliary b movable contact, 7: Auxiliary b fixed contact terminal.

Claims (1)

[Scope of utility model registration request] The movable core of the electromagnet housed in the electromagnetic contactor casing drives the movable core vertically, and when the movable core is attracted by the excitation of the fixed core, the movable contact is brought into contact with the fixed contact, and the movable contact is brought into contact with the fixed contact by demagnetization of the fixed core. In an electromagnetic contactor equipped with a movable element that separates the movable contact from the fixed contact and closes the B contact using the restoring force of a repulsion spring,
A tapered stopper that is inclined with respect to the moving direction of the movable element is formed on the inner side of the casing that the movable element collides with during degaussing, and the movable element has a stopper that is inclined with respect to the moving direction of the movable element. A return prevention device for a movable element in an electromagnetic contactor, characterized in that a tapered portion is formed in sliding contact with a tapered surface of the tapered stopper.