JPS61233919A - Contact switchgear - 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 [Technical Field] The present invention relates to a contact opening/closing device applied to relays, switches, contactors, etc.

[Background technology]

Conventional contact opening/closing devices of this type often suffer from problems such as arcing due to bounce when the contact is closed or electromagnetic repulsion due to inrush current, and contact material melting and welding due to the accompanying arc.

This is a particularly important problem when used under loads that require welding resistance.

As a countermeasure against this, various materials with high arc resistance have been invented, but these are basically -JC+5
It is a material in which nOzln*0Ji03 or the like is dispersed, and the welding resistance is improved by increasing the melting point. However, most of them exhibit high contact resistance, which causes problems such as temperature rise and poor contact when energizing, which necessitates extremely high contact pressure, which leads to design problems such as increasing the size of equipment. This is a difficult point.

On the other hand, in order to prevent welding from a mechanical point of view, attempts have been made to make both movable and fixed contacts slide relative to each other. Examples include a method in which a leaf spring is bent in a hinge type relay, and a method in which a movable contact is held at an angle in the operating direction with respect to a fixed contact in a two-point cut. However, these methods have limits on the amount of wiping and wiping force, and in practice they have little effect on performance against inrush current, and cleaning the contact surface by sliding helps improve contact stability at a low level. is the current situation.

[Purpose of the invention]

An object of the present invention is to provide a contact opening/closing device that ensures welding resistance and contact stability and can be made smaller and capable of increasing capacity.

[Disclosure of the invention]

The present invention includes a first contact in which an arc contact and a main contact are arranged side by side at a distal end, a second contact in which a main contact facing the arc contact is provided, and a base end of the first contact. a contact holder supported by a rotating shaft; and a contact holder interposed between the contact holder and the tip end side of the second contact to urge the second contact in a direction away from the contact holder. a stopper for positioning the second contact; and a driving means for driving the contact holder so that the first contact and the second contact open and close; The arc contacts are first in contact with each other, the main contacts are in contact with each other in the closed state, and the arc contacts are later separated in the open state.

According to this invention, the first and second contacts are provided with an arc contact and a main contact, respectively, and the arc contacts contact each other first and then separate, thereby preventing damage to the main contact and making contact. Stability can be ensured, current carrying capacity can be increased, and contact pressure can be reduced, making it possible to downsize. In addition, since the arc contact can be made of a high-melting point material, welding resistance can be improved.Moreover, during opening and closing operations, forced wiping can be performed between the arc contact and the main contact, ensuring welding resistance. It can reduce the impact of the machine, lower the input noise, and reduce the operating noise of the equipment.

Embodiment A relay to which an embodiment of the present invention is applied will be described with reference to FIGS. 1 to 3. In FIG. 1, driving means A
is constructed as follows using an electromagnet. That is,
The outer shell 1 is composed of a case 2 and a cover 3. One end of the coil frame 5 is placed in contact with the vertical part 4a of the L-shaped base 4 installed in the case 2, and is arranged parallel to the horizontal part 4b, and the coil 6 is wound around the coil frame 5. The fixed iron core 7 is passed through the yoke 5, and one end thereof is embedded along the base 4, and is attached to the vertical part of an L-shaped yoke (not shown) having the same shape as the base 4. Armature 9 is attached to the horizontal end of this yoke.
is rotatably attached by a known hinge connection means,
An armature 9 faces the fixed it core 7. A card 10 is attached to the tip of the armature 9, and a return spring 1) is stretched between the rear end and the base 4 to bias the armature 9 in a direction away from the fixed iron core 7. A coil terminal 12 is provided protruding from the base 4 and is inserted through the slit 13 of the case 2 to the outside of the case 2.

Contact holder 1 driven by such driving means A
5 is rotatably supported by a fixed shaft 14. The fixed shaft 14 is provided upright on the flange of the nine armatures of the coil frame 5. 1
6 is fitted, and the return torsion coil spring 17 is attached to the fixed shaft 14.
is inserted, and one end is locked to the contact holder 15 and the other end is locked to the flange, thereby urging the contact holder 15 toward the card 10 side. Hole 21 in the middle part of the contact holder 15
A rotating shaft 18 with a head is inserted through the contact holder 15, and the E-ring 19 is attached to the contact holder 15 by engaging with the circumferential groove 20 at the tip.

The first contact 22 has an arc contact 23 and a main contact 24 arranged side by side at the tip thereof by brazing or the like.

The arc contact 23 is made of a material with a high melting point and high arc resistance, such as AgWc, 8g-, or an internal oxide material with a high oxide content, such as Ag5nOzlnz03+Ag5nO.
Consists of 2BI05. The main contact 24 is made of a material with good conductivity and excellent contact stability, such as Heg alloy or Heg alloy, which has a relatively large amount of Ag. The base end of the first contactor 22 has a side plate 25, and a bearing 26 is formed in the side plate 25 as a long hole in the longitudinal direction.

This bearing 26 is passed through the rotating shaft 18, and the first contact 2
A spring 2 is installed between the tip of the contactor holder 15 and the tip of the contactor holder 15.
7 is compressed and the first contact 22 is attached to the contact holder 15.
It is biased in the direction away from the A stopper 34 is provided at the rear end of the first contact 22 so that the first contact 22 is connected to the spring 2.
Position against a spring force of 7. Also, the first contact 2
A wire element 28 is connected to the rear end of the case 2, and connected to a terminal 29 inserted through the slit 3 of the case 2. The second contact 30 integrally forms a terminal 31, is fixed through the slit 13 of the case 2, and has an arc contact 23 at an inner end bent at right angles.
An arc contact 32 and a main contact 24 having the same configuration as the main contact 24 and a main contact 33 having the same configuration are respectively formed between the arc contact 23 and the main contact 24 and the groove 35 between the arc contact 32 and the main contact 33. In order to prevent the consumable powder generated in the process from scattering to the main contact 24°33 side, the surface area of the arc contact 23°32 side is made larger than that of the main contact 24.33 side to increase the wear margin on the arc contact 23.32 side. I'm making it.

This relay is such that when the coil 6 is not energized, the card 10 of the armature 9 is pivoted by the return spring 1) and the contact holder 15 by the torsion coil spring 17 in the direction away from the second contact 30, thus The first contactor 22 is in an open state. When the coil 6 is energized, the fixed iron core 7 is energized, and the armature 9 is activated by the return spring 1).
is attracted against the contact holder 15 by the card 10.
is pressed, and the first contact 22 comes into contact with the second contact 30 due to the rotation of the contact holder 15 .

FIG. 2 shows details of the operating state when the first contact 22 approaches and separates from the second contact 30. Figure 2) shows the coil 6 in an open state where it is not energized, and the first contact 2
2 is supported by a stopper 34 and faces the second contact 30 . In the same figure (bl shows the state in which the coil 6 is energized, the contact holder 15 is pressed by the card IO, the contact holder 15 rotates around the fixed shaft 14, and first the arc contacts 23° 32 Further, as the card 10 presses the contact holder 15, the first contact 22 rotates about the rotating shaft 18 in a direction that compresses the spring 27, and the contact point becomes the arc contact 23. A forced wiping operation is performed from the comrade 32 to the comrades 24 and 33 of the main contacts. In the same figure (C1 is the state after the wiping operation, the arc contacts 23 and 32 are eventually separated and the comrades the main contacts 24 and 32 are separated).
33 comrades are in contact. When the coil 6 is de-energized, the card 10 is separated, so that the opening operation is performed in the opposite manner to the above. In this way, at the time of contact, the arc contact 23
゜32 comrades are in contact, the contact state is main contact 24゜33
Since the arc contacts 23 and 32 will open later, the arc will be received between the arc contacts 23 and 32 at the time of breaking and closing.
The main contacts 24 and 33 are not damaged, wear is reduced, and contact stability can be ensured. Also, arc contact 23
．． Since 32 is made of a material that is resistant to welding, welding can be reliably prevented by the forcibly performed wiping operation.

FIG. 3 (al is time on the horizontal axis, and the first contactor 22
is the displacement characteristic when the vertical axis is the displacement of 15 and the first contactor 22 operate and the arc contact 23 contacts the arc contact 32, from time t1 to time t2 the arc contact 23.32 separates and the main contact 2
4.33, and it usually takes a few seconds from time t0 to time t2 when ON is the final contact position.
It is more than ten mm5ec. Also, displacement up to 1° even when OFF! X represents the amount of gap between the first contact 22 and the second contact 30 at time t.

(7) The amount of overtravel is required from the displacement position to ON, and the distance between OFF and ON is usually a few steps. Figure 3 fb
) indicates the contact signal V between the contacts, and the OFF corresponding to the above
indicates a cutoff state, and ON indicates a conduction state, at time t. This shows that contact bounce P occurs due to the impact when the arc contacts 23 and 32 contact each other. This contact bounce P generates an arc, but by setting time 1)-12 larger than the duration of contact bounce P, it is possible to prevent an arc from occurring between the main contacts 24 and 33. is set by the surface area of the arc contact 23.32 and the wiping action.

In the present invention, the contact holder 15 is urged back by the torsion coil spring 17, but it may also be configured to be connected in conjunction with the card 10, or the contact holder 15 may be configured to rotate by the fixed shaft 14. However, the final contact state of the contacts may be configured to move in parallel.In the above embodiment, only the main contacts 24 and 33 are in contact with each other as shown in C1, but as shown in arc contact 23.
There is no electrical problem even if both the contacts 32 and the main contacts 24 and 33 are in contact with each other.

[Effects of the Invention] According to the present invention, the first and second contacts are provided with an arc contact and a main contact, respectively, and the arc contacts contact each other first and then separate, thereby preventing damage to the main contact. In addition, since the arc contact can be made of a high-melting point material, welding resistance can be improved, and the wiping action between the arc contact and the main contact can be forced during opening/closing operations. Can ensure welding resistance. Therefore, it has the effect of being smaller and having a higher capacity than the conventional one.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a relay to which an embodiment of the present invention is applied, FIG. 2 is an explanatory diagram showing the opening and closing operation of the contacts, and FIG.
The figure is a diagram of displacement characteristics and contact signal characteristics with respect to time. A... Drive means, 14... Fixed shaft, 15... Contact holder, 18... Rotating shaft, 22... First contact, 2゛3゜32... Arc contact , 24.33... Main contact, 26... Bearing, 27... Spring, 30...
・Second contactor, 34...Stock flange, Figure 2, Figure 31)

Claims (2)

[Claims] (1) a first contact in which an arc contact and a main contact are arranged side by side at the tip; a second contact in which an arc contact faces the arc contact and a main contact faces the main contact; A contact holder that supports the base end of the first contact by a rotating shaft, and a contact holder that is interposed between the contact holder and the distal end side of the second contact to bring the second contact into contact. a spring that biases the child holder in a direction away from the child holder; a stopper that positions the second contact; and a stopper that drives the contact holder so that the first contact and the second contact open and close. a driving means, the arc contacts contact each other first when closed, the main contacts contact each other when closed, and the arc contacts later open and separate when opened. Switchgear. (2) The contact holder is rotatably supported on a fixed shaft, and the bearing supported on the rotating shaft of the second contact is a long hole extending in the longitudinal direction of the second contact. A contact switching device according to claim (1).