JP2882570B2 - Electromagnetic contactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor, and more particularly to a drive mechanism for a movable contact.

[0002]

2. Description of the Related Art In a conventional electromagnetic contactor, an electromagnet which moves up and down linearly to drive a movable contact is used as a driving source. In this method, a current is applied to a coil wound below a pair of upper and lower cores to magnetize the core, and the movable contact is driven by the attraction force.

[0003]

However, in the conventional electromagnetic contactor, the impact sound at the time of collision between the movable iron core and the fixed iron core is large, and particularly, a large electromagnetic contactor may generate noise. In order to solve this, conventionally, means for soundproofing and vibrationproofing have been taken, but this has not led to an essential reduction in sound. The problem to be solved by the present invention is to significantly reduce the impact noise when opening and closing the electromagnetic contactor.

[0004]

According to another aspect of the present invention, there is provided an electromagnetic contactor in which the movable contact comes into contact with or separates from the fixed contact by a linear movement of the movable contact. A rotary solenoid is used as a drive source for closing the contacts, and a power transmission mechanism for converting a rotary motion of the rotary solenoid into a linear motion of the movable contact is provided. A cam can be used for a power transmission mechanism between the rotary solenoid and the movable contact. Further, the means for returning the rotary shaft of the rotary solenoid to the open position of the electromagnetic contactor can be an elastic body.

[0005]

When a drive voltage is applied to the rotary solenoid at the time of closing, the rotary shaft of the rotary solenoid rotates, and this rotational motion is converted into linear motion of the movable contact via a power transmission mechanism such as a cam. The main circuit is closed by contact with the fixed contact. At the time of opening, when the drive voltage of the rotary solenoid is turned off, the torque of the rotary shaft disappears, and the main circuit is opened by the repulsive force of the elastic body and the main contact spring incorporated in the rotary solenoid.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings. FIG. 1 is a sectional view of a main body of an embodiment according to the present invention. In the figure, 1 is a movable contact, 2 is a fixed contact,
3 is a rotary axis of a rotary solenoid, 4 is a cam, 5 is a cam receiver, 6 is a connecting portion, 7 is a vertical seat, 8 is a main contact spring, 9 is a rotary solenoid, 10 is a magnetic contactor body case, and 11 is a repulsion spring. , 12 are rotating bearings, 13
Is a through hole, and 14 is a repulsion spring storage portion.

The rotary solenoid 9 is fixed to an electromagnetic contactor main body case 10. A cam 4 is fixed to the rotary shaft 3 of the rotary solenoid, and a cam receiver 5 penetrates the cam 4, and the cam receiver 5 is fixed to a connecting portion 6. The connecting portion 6 is connected to the upper and lower seats 7, and the movable contact 1 is attached to the upper and lower seats 7. The movable contact 1 moves up and down between the movable contact 1 and the fixed contact 2 to open and close the main circuit. Do.

FIG. 2 is a view of the rotary solenoid 9 as viewed from the back, and a spring-like repulsion spring 11 is attached to the rotary shaft 3 of the rotary solenoid inside the repulsion spring housing 14.

FIG. 3 is a structural view of the cam 4 used in FIG.
The cam 4 is provided with a rotary bearing 12 for fixing the rotary shaft 3 of the rotary solenoid and a curved through hole 13 for passing the cam receiver 5.

FIG. 4 shows the movement of the connecting portion 6 accompanying the rotation of the cam 4, and FIG.
(B) shows the state when the main circuit is turned on. FIG.
The operation will be described with reference to FIG.

<When the main circuit is turned on> When the main circuit is opened (FIG. 4)
From (a)) to the closed state (FIG. 4 (b)), when a drive voltage is applied to the rotary solenoid 9, the rotary shaft 3 of the rotary solenoid rotates by a certain angle, and the cam 4 fixed thereto rotates. When the cam 4 rotates, the cam receiver 5 passed through the through hole 13 moves along the curved shape of the through hole 13. In response to this movement, the connecting portion 6 connected to the cam receiver 5 simultaneously moves downward to close the main circuit. 4 (a) and FIG. 4 (b), the portion indicated by L is the displacement amount at which the movable contact 1 finally moves.

<When main circuit is open> Rotary solenoid 9
When the drive voltage of the rotary solenoid is turned off, the rotary shaft 3 of the rotary solenoid
Is no longer rotating and becomes free. The rotary shaft 3 of the rotary solenoid is rotated in a direction opposite to that at the time of closing by a repulsion spring 11 (see FIG. 2) mounted in a repulsion spring storage portion 14. By this rotation, the cam 4 also rotates in the opposite direction, the cam receiver 5 is pushed up, and the connecting portion 6
Moves upward and instantaneously opens the main circuit.

As described above, the electromagnetic contactor using the rotary solenoid and the cam does not have any colliding parts as compared with the conventional one using the iron core, so there is almost no sound generated from the electromagnet, and the contact noise of the main contact. Only.

[0014]

As described above, according to the present invention, the following effects can be obtained.

Since the rotary solenoid is used as a drive source of the movable contactor of the electromagnetic contactor, the opening / closing impact sound of the electromagnetic contactor can be limited to only the contact sound of the main circuit contact, resulting in a remarkable silent effect. Conventionally, when the electromagnetic contactor is turned on and opened, almost the same impact noise is generated, but in the present invention, both cases can be made quiet.

Conventionally, there has been mechanical repulsion when the iron cores collide with each other during suction. However, in the present invention, the movement of the movable contact is limited to only the movement along the through-hole of the cam. There is no rebound, and the effect on vibration isolation is high.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main body of an embodiment according to the present invention.

FIG. 2 is a rear view of the rotary solenoid.

FIG. 3 is a structural view of a cam used in FIG.

FIG. 4 shows a series of operations accompanying the rotation of the cam.
(A) is a front view showing a state when the main circuit is opened, and (b) is a front view showing a state when the main circuit is turned on.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Movable contact, 2 Fixed contact, 3 Rotary axis of rotary solenoid, 4 Cam, 5 Cam receiver, 6 Connecting part, 7 Upper and lower seat, 8 Main contact spring, 9 Rotary solenoid, 10 Electromagnetic contactor case, 11 Repulsion Spring, 12 rotating bearing, 13 through hole, 14 rebound spring storage, L displacement

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01H 50/00-50/92

Claims (3)

(57) [Claims] 1. An electromagnetic contactor in which a movable contact comes into contact with and separates from a fixed contact by a linear movement of the movable contact, wherein a rotary solenoid is used as a drive source for closing the movable contact, and An electromagnetic contactor comprising a power transmission mechanism for converting a rotary motion into a linear motion of the movable contact. 2. The electromagnetic contactor according to claim 1, wherein a cam is used for a power transmission mechanism between the rotary solenoid and the movable contact. 3. The electromagnetic contactor according to claim 1, wherein the means for returning the rotary shaft of the rotary solenoid to the open position of the electromagnetic contactor is an elastic body.