JPS5848309A - Contact mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact mechanism of a contact device such as a switch or a relay.

Conventionally, when the current flowing through the contact tR of a switch, relay, or relay used to control electrical equipment is alternating current, the current phase at the time of interruption is random, so the current is interrupted at zero phase. There is almost no chance of arcing occurring. As a result, there is a lot of wear and tear on the contacts, and since the wear and tear is taken into consideration when designing, the volume of the contacts becomes large and costs are high! It had become. Also, due to the heat generated by the arc,
There is also the risk of gas generation from the case and other resins and deterioration of the insulation.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide a contact mechanism that can perform contact 8 separation when the 1kfiL phase flowing through the contact is zero, and can suppress the generation of arc when the contact opens. That is.

Hereinafter, one embodiment of the present invention will be described based on the t-tV plane. In FIGS. 1 to 8, the movable contact piece 4 is rotatably supported by a rotating shaft 6 attached to its center, and is supported by a return spring 12° 18 in the direction of rotation, that is, in the second direction. In FIG. 8, it is biased in the clockwise direction. Movable contacts 10 and 11 are attached to both ends of the movable contact piece 4, respectively, on the opposite side to the above-mentioned biasing direction, that is, on the counterclockwise (b) counterclockwise direction. 10. Identification contacts 8.
9 is provided on the fixing piece 6.7. Furthermore, the movable contact piece 4
On both sides symmetrically with respect to the rotating shaft 5, a movable iron piece 2.8 is fitted on the surface on the biasing direction side, that is, on the clockwise direction side. This movable iron piece 2.8 is made of a U-shaped magnetic material, so that the movable contact piece 4 is located inside the U-shaped opening, that is, the opening is directed in the opposite direction to the biasing direction, that is, counterclockwise. The movable contact piece 4 is attached to the movable contact piece 4 so as to face in the direction shown in FIG. The movable iron piece 2.8 and the movable contact piece 4 are arranged in a clockwise direction 111 (1! Direction I opposite to the biasing direction
I) A fixed iron piece 1 made of a magnetic material is fixed nearby.

Next, the operation will be explained. First, when no external force is applied to the movable contact piece 4, the movable contact piece 4Fi is biased clockwise by the return spring 12, 18 as shown in FIG. 8, and the contact 8. between 10 and contact 9
．． They are separated for 10 minutes. As shown in FIG. 4, time t,
The return spring 12.18 is biased in the opposite direction (
When an external force F (see Fig. 2) greater than the biasing force of the return spring 12.18 is applied in the counterclockwise direction, the movable contact piece 4#
i Rotate in the counterclockwise direction and close the contact 8 as shown in Figure 2.
．． 10 and contact 9°11r#! J comes into contact, and the movable iron piece 2.8 hits the fixed iron piece 1 i. Then, a load current flows through this movable contact piece 4. At this time, since the opening of the movable iron piece 2°8 is closed by the fixed iron piece 1, the magnetic flux generated by tR flowing through the movable contact piece 4 flows through the magnetic circuit formed by the fixed iron piece 1 and the movable iron pieces 2 and 8. street,
The fourth force is used to attract the movable iron piece 2.8 to the fixed iron piece l.
It works as shown in the figure. Therefore, this movable contact piece 4
As shown in FIG. 4, the attractive force acting on the entire body is the sum of the external force F and the force due to this load current.

Assuming that the external force F ceases to act at time t2, the load %
The only force of attraction is the current. Therefore, as shown in the fourth example, if the temporary value of the load current is one phase at time t2, then this load current 1! The magnetic flux generated by the IK acts as an attractive force, and the movable iron piece 2.8 becomes 1 constant iron piece 1.
The state in which the contacts 8 and 10 and the contacts 9 and 11 are kept in contact with each other without opening is maintained.

Then, the phase advances, the instantaneous value of the load current decreases, and the attraction force also decreases, and the attraction force of the runner is increased by the return spring 12.1.
When the biasing force at 8 becomes smaller, the movable contact piece 4 begins to rotate clockwise (clockwise) and contacts 8 and 10 and contacts 9 and 11 open. At this time, the instantaneous value of the load current is extremely large. Since it is small in size, arcs hardly occur between the contacts, and therefore, roughness of the contacts due to the heat of the arc is suppressed as much as possible.

Also, since there is almost no wear and tear on the contacts, there is no need to increase the size of the contacts in anticipation of wear and tear.

In addition, in the above embodiment, the movable iron piece 2.8 has the = shape Kll.
A fixed iron piece IYt was made into a flat plate, but a movable iron piece 2.8t-
Fixed iron piece 1f in flat plate shape: It can also be made into a U-shape.

As explained above with reference to the embodiments, according to the present invention,
Since the movable contact piece has a balanced I11 configuration with a symmetrical Km point and a movable iron piece with respect to the rotational axis in the center,
It is possible to realize a horizontal pipe of a contact machine in which there is almost no occurrence of 1IIIJJ operation of the contacts due to external vibrations or shocks, the reliability is improved, and arc generation can be suppressed when the contacts are separated.

[Brief explanation of the drawing]

Fig. 1 is a @ perspective view of an embodiment of the present invention, JI Fig. 2 and Fig. 8.
The figure is a front view of the same embodiment, and FIG. 4 is a time chart for explaining the operation. 1...Fixed iron piece, 2.8...Movable iron piece, 4
... Possible contact piece, 6... Cell rotation axis, 8.9.1
0.11...Contact, 12.18...Return spring. Applicant: Tateishi Electric Co., Ltd. Agent: Yusuke Sato, patent attorney

Claims (1)

[Scope of Claims] (1) A movable contact piece that is pivotably supported in a central portion, a return spring that biases the movable contact piece in one rotation direction, and a movable vibrator as described in 1IiI. Movable contacts mounted opposite to the biasing direction at both ends of the piece, fixed contacts arranged to face these movable contacts, and both sides symmetrical with respect to the center of the movable contact piece. A movable iron piece made of a pair of magnetic materials each fixed on the biasing direction side, and one movable contact piece is attached to each of these movable iron pieces so as to face each other across the Kojiki movable contact piece assembly. A contact mechanism consisting of a fixed iron piece made of magnetic material placed near the side opposite to the direction of force. 12) The pair of movable iron pieces described if J are each formed in a U-shape with a narrow opening opening on the side facing the constant iron piece, and the movable contact piece is K-shaped so as to be surrounded by this U-shaped opening. The contact mechanism according to claim 1, wherein the movable contact piece is defined as 1*molten. (3) The fixed iron pieces arranged to face each of the pair of movable iron pieces are each formed in a U-shape with an opening opening on the side facing the movable iron pieces.
2. The contact mechanism according to claim 1, wherein the movable contact piece that has moved in a direction KCl opposite to the biasing direction is configured to enter inside the U-shaped portion.