JPH10241528A - Relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relay of which a contact is prevented from being heated to high temperature by an arc at the time of shutting a circuit and of which the shutting performance is improved. SOLUTION: A holding mechanism is composed of a permanent magnet 68 attached to and fixed in a second terminal part 43 adjacently to a main fixed contact 50 and a conductive plate 69 made of an electromagnetic member causing a magnetic attraction force between the permanent magnet 68 and itself. A pair of main contact points 45, 50 are kept in the contacting state by the magnetic attraction force between the permanent magnet 68 and the conductive plate 69 by the holding mechanism until at least a pair of arc contacts are opened at the time of opening operation. Consequently, since electric current is shut between the main contact pair 45, 50 made of a material with low contact resistance (a low melting point metal material), the contact temperature of the main contact pair 45, 50 does not rise and an arc is reliably cut. As a result, no shutting failure occurs and shutting property is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay having a contact for switching a load having a large inrush current such as a motor or a lamp.

[0002]

2. Description of the Related Art Conventionally, as a relay of this type, there is a relay filed by the present applicant as Japanese Patent Application No. Hei 7-21645. This is configured by combining an electromagnet block 1 and a separate contact block 2 as shown in FIGS. The electromagnet block 1 is configured such that the movable frame 3 is attracted and sucked by the iron core 4 so that the electromagnet block 1 is moved toward and away from the permanent magnet 22.
The electromagnet device 5 self-held by the electromagnet base 6
The contact block 2 is configured by incorporating a contact device 8 into a contact base 7 separate from the electromagnet base 6. The electromagnet block 1 and the contact block 2 separate from the electromagnet base 6 are connected to each other. In the combined state, the contact of the contact device 8 is switched by driving the movable frame 3 of the electromagnet device 5.

The electromagnet base 6 has a rectangular cylindrical shape, and a flat rectangular cylindrical auxiliary outer shell portion 10 is integrally formed on one part of an outer shell main body portion 9 having a bottomed square cylindrical shape. is there. The opening end side of one end of the rectangular magnet-shaped electromagnet base 6 is a square tubular fitting part 12 for fitting a square tubular fitting part 11 of the contact block 2 described later. ing. Fitting part 1
2, an engagement hole 13 is formed. Guide grooves 14 are respectively provided above and below the inner surfaces of two opposing pieces of the outer shell main body 9 having a rectangular cylindrical shape. Further, two opposing pieces of the outer shell main body 9 are provided with protrusions 1 provided on a coil bobbin 15 described later.
6 is formed with a hole 17 for fitting. A notch 19 for inserting a manual lever 18 to be described later is provided at one end on the opening end side of the outer shell main body 9 and the auxiliary outer shell 10 at positions vertically opposed to each other.

The electromagnet device 1 includes a coil bobbin 15, an iron core 4, a yoke 20, an armature 21, a permanent magnet 22, a movable frame 3, a silent damper 23, and the like. York 2
Reference numeral 0 denotes a main yoke 24 constituting a main body and a pair of side yokes 25 having a magnetic pole surface facing the armature 21. A pair of arm portions 2 of a movable frame 3 to be described later are respectively provided on outer surfaces of both of the U-shaped opposed pieces of the main yoke 24.
A shaft portion 28 for rotatably supporting the bearing portion 27 of No. 6 is provided. Comb-shaped engaging portions 29 are formed on both sides of the distal end surface portion of each of the U-shaped opposing pieces of the main yoke 24, and engaged portions engaged with the engaging portions 29 are formed on the side yoke 25. A side yoke 25 is attached to both sides of the distal end of the U-shaped main yoke 24 by engaging the engaged portion 30 with the engaging portion 29.

The iron core 4 is simultaneously molded and inserted into the coil bobbin 15 when the coil bobbin 15 is integrally molded with a synthetic resin, and both ends of the iron core 4 protrude from the coil bobbin 15. A collar 31 is provided on both sides of the coil bobbin 15.
The coil terminal 32 is fitted and attached to the flange 31, and the winding 33 is wound around the coil bobbin 15. Further, the flange portion 31 of the coil bobbin 15 is provided with a projection 16 for fitting the hole 17 provided in the electromagnet base 6. Both ends of the iron core 4 protrude from the coil bobbin 15, and a silent damper 23 is attached to one protruding portion 34 of the iron core 4.

The movable frame 3 has a substantially U-shape with two arms 26 projecting from a central piece 35. A bearing 27 is provided at the tip of both arms 26, and the bearing 27 is Yoke 24
Is rotatably supported on the shaft portion 28. A fitting recess (not shown) is formed in the central piece 35 of the movable frame 3.
The distal end of a block in which a permanent magnet 22 is interposed between the distal ends of a pair of armatures 21 is fitted into the fitting recess and is fixed with an adhesive. A first protrusion 36 and a second protrusion 37 project from the central piece 35 of the movable frame 1 in the direction opposite to the direction in which the arm 26 projects.

As described above, the coil bobbin 15, the iron core 4,
The electromagnet device 5 constructed by assembling the yoke 20, the armature 21, the permanent magnet 22, the movable frame 3, the silent damper 23 and the like is fitted inside the opening of the outer shell main body 9 of the electromagnet base 6 and is housed therein. When the electromagnet device 5 is fitted and attached to the electromagnet base 6, the manual lever portion 18 is inserted through the cutout portion 19, and the tip of the manual lever portion 18 projects outside. By operating the manual lever portion 18 from outside, the electromagnet device 5 can be operated from outside. An auxiliary contact block 38 is fitted into the auxiliary outer shell 10 of the electromagnet base 6 through an opening, and is incorporated therein.
The auxiliary contact 40 of the auxiliary contact block 38 can be operated by the auxiliary contact operating section 39 of the manual lever section 18. In other words, when the movable frame 3 rotates, the auxiliary contact operation unit 39 is driven by the manual lever unit 18 to turn on and off the auxiliary contact 40.

[0008] The contact block 2 is configured by mounting a contact device 8 inside a contact base 7 having a rectangular cylindrical shape. A fitting portion 11 is formed at one end of the contact base 7 for fitting with a fitting portion 12 at one end of the electromagnet base 6. The other end of the contact base 7 has a contact base 7 of another contact block 2.
A fitting portion 12 'is provided so that the fitting portion 11 can be fitted with the fitting portion 11. The inside of the contact base 7 is partitioned by a partition plate 41. The contact device 8 includes a first terminal portion 42 and a second terminal portion 4.
3. The first terminal portion 42 is the first terminal body 4
4, a main movable spring 46 provided with a main movable contact 45.
And an arc movable spring 48 provided with an arc movable contact 47. The second terminal 43 is connected to the second terminal body 49 by a main fixed contact 50 facing the main movable contact 45, and an arc movable spring 48. An arc fixed contact 51 facing the contact 47 is provided. Partition plate 4 for contact base 7
A first terminal portion 42 is provided in one of the compartments partitioned by 1,
A second terminal portion 43 is provided in the other chamber. The portion of the main fixed contact 50 of the second terminal 43 or the arc fixed contact 51
Is projected from the hole 52 of the partition plate 41 into the other chamber. The main movable contact 45 and the main fixed contact 50 face each other, and the arc movable contact 47 and the arc fixed contact 51 face each other. The arc movable contact 47 and the arc fixed contact 51 are both formed of a material having a high welding resistance (high melting point metal) such as tungsten. Also,
Both the main movable contact 45 and the main fixed contact 50 are formed of a material (low melting point metal) having low contact resistance.

A card 55 is rotatably mounted in one of the chambers of the contact base 7 partitioned by the partition plate 41. The card 55 has a shaft portion 56 protruding from the partition plate 41 and a hole 57 at one end of the card 55 rotatably attached thereto. A mating portion 11 of another contact base 7 is fitted to a mating portion 12 ′ of the contact base 7.
The contact blocks 2 are detachably joined by fitting. An insulating plate 58 is interposed between the contact bases 7 of the adjacent contact blocks 2 and joined. The card 55 is provided with a pin hole 59, and the cards 55 of the adjacent contact blocks 2 are interlocked with the pins 60 having both ends fitted into the pin holes 59. The partition plate 41 and the insulating plate 58 are provided with pins 60.
Are provided.

When the contact base 7 is connected to the electromagnet base 6, the movable frame 3 provided on the electromagnet block 1 and the card 55 provided on the contact block 2 are mechanically connected. That is, as described above, the center piece 35 of the movable frame 3 has the first
The protrusion 36 and the second protrusion 37 are provided so as to protrude, and the card 5
5 includes a first acting portion 63 acted by the first projecting portion 36 and a second acting portion 6 acted by the second projecting portion 37.
4 are provided. Here, the arc contact portion 53 of the contact block 2 is switched from on to off when the first operation portion 63 operates by the first projection portion 36, and the operation of the first operation portion 63 by the first projection portion 36 is released. It is set to be turned on in the state, and the main contact portion 54 is
Is set so as to be switched from off to on when acting on the second action portion 64 and to be off when the action of the second projection portion 37 on the second action portion 64 is released. The timing of switching the portion 54 from OFF to ON is delayed from the timing of switching the arc contact portion 53 from OFF to ON, and the timing of switching the arc contact portion 53 from ON to OFF is set to the main contact portion 5.
4 is set to be later than the timing of switching from ON to OFF.

The movable frame 3 attracts and repels the armature 21 magnetically coupled to the permanent magnet 22 to and from the side yoke 25 by exciting and reversely exciting the winding 33 of the electromagnet device 5 to rotate the movable frame 3. The contact block 2 is driven by rotating the card 55 by the movement of the movable frame 3, and the auxiliary contacts 40 of the auxiliary contact block 38 are driven by the rotation of the movable frame 3. After the rotation, the winding 3
Even if the magnet 3 is not excited, the movable frame 3 is held by the permanent magnet 22 as described above. That is, this relay functions as a latching relay.

First, the closing (closing) operation of the relay is shown in FIG.
It will be described based on. That is, FIG. 24A shows that the arc movable contact 47 is separated from the arc fixed contact 51 and the main movable contact 45 is separated from the main fixed contact 50 so that the arc contact pairs 47 and 51 and the main contact pairs 45 and 50 are separated.
Are off. In the state shown in FIG. 24A, the first operating portion 63 is pushed by the first projection 36 of the movable frame 3, and the arc movable spring 48 is pushed by the pushing portion 66 of the card 55, and the arc movable contact 47 is formed. The arc fixed contact 51 is separated and the pressing of the movable frame 3 by the second projection 37 on the second action portion 64 is released, and the main movable spring 46 is moved by the elastic force of the main movable spring 45 and the main fixed contact 50. Are separated.

In the state shown in FIG.
When the movable frame 3 is rotated as shown in FIG. 24B by excitation of the movable frame 3, the first projection 36 moves with the rotation of the movable frame 1, so that the first projection 36 is attached to the card 55. The pressing is released, and the arc movable spring 48 is elastically restored, and the arc movable contact 47 and the arc fixed contact 51 are brought into contact with each other and turned on. It rotates to the position of (b). At the time of FIG. 24 (b), the arc movable contact 47
Contacts the arc fixed contact 51 and is turned on,
The main movable contact 45 is separated from the main fixed contact 50 and is in an off state.

When the movable frame 3 is further rotated from the state shown in FIG. 24B as shown in FIG.
As a result, the second action portion 64 is pushed to rotate the card 55 and the main movable spring 46 supported by the support portion 67 of the card 55.
Is pressed, and the main movable contact 45 contacts the main fixed contact 50 to be turned on. In the state shown in FIG.
Since the projection 36 does not press the first action portion 63 and the pressing portion 66 is separated from the arc movable spring 48, the state where the arc movable contact 47 is in contact with the arc fixed contact 51, that is, the ON state is maintained. You. First, like this
After the arc contact pairs 47 and 51 having good welding resistance are closed, the main contact pairs 45 and 45 having low contact resistance after a certain period of time.
By closing 50, the danger of closing the main contact pairs 45 and 50 having a low contact resistance when an inrush current flows is extremely reduced, and contact welding hardly occurs.

Next, the opening (cutting) operation of the relay will be described with reference to FIG. FIG. 25A shows the same state as FIG. 24C, that is, the main contact pairs 45 and 50 and the arc contact pairs 47 and 51 are all in the contact state (ON state).
In the state of FIG. 25 (a), when the winding 33 is reversely excited and the movable frame 3 rotates as shown in FIG. 25 (b), the second protrusion 37 is rotated with the rotation of the movable frame 3. Is moved, the card 55 pressed by the second protrusion 37 is pushed by the restoring spring force of the main movable spring 46 to rotate, and the main movable spring 46 moves in the return direction by the restoring spring force. The main movable contact 45 is separated from the main fixed contact 50 and turned off. In the state of FIG. 25 (b), this is the moment when the first projection 36 hits the first operating portion 63 (at this time, the second projection 37 is moved to the second operating portion 64).
At this time, the moment when the push portion 66 hits the arc movable spring 48, and the arc movable contact 47 contacts the arc fixed contact 51 and is turned on.

When the movable frame 3 further rotates as shown in FIG. 25C from the state shown in FIG. 25B, the first protrusion 36
Pushes the first action portion 63, the push portion 66 pushes the arc movable spring 48, and the arc movable contact 47 moves to the arc fixed contact 51.
It is separated from and turned off. In the state shown in FIG. 25C, the state in which the main movable contact 45 is separated from the main fixed contact 50 continues to be in the off state. As described above, first, the main contact pairs 45 and 50 having low contact resistance are opened and turned off, and after a certain time, the arc contact pairs 47 and 51 having good welding resistance are opened and turned off, and the main contact pairs are turned off. It is possible to suppress the occurrence of an arc at the time of the opening (off) operation of 45, 50.

[0017]

In the above relay, when a low power factor load (an inductive load such as a motor) is cut off, a main contact formed of a contact material having a low contact resistance (a low melting point metal material) is used. After separation, an arc is generated at an arc contact formed of a contact material (high melting point metal material) having excellent welding resistance, and the arc is maintained until the current becomes zero. The contact material of the arc contact has a very high melting point, and the energy of the breaking arc causes the temperature of the arc contact to rise, making it easier for electrons to be emitted from the surface. If the temperature is too high, the Fermi level rises, leading to electron emission at a low voltage. (For example, in the case of tungsten, the work function is very high at room temperature,
Although it is a material that does not easily emit electrons,
It emits electrons as easily as a fluorescent lamp filament.
This means that the Fermi level increases with an increase in the temperature of tungsten, and electrons are easily emitted. )]. Thereafter, the current flow is temporarily interrupted at the current zero position. However, since the load has a low power factor, the re-motive voltage is high. (This is because the energy stored in the inductance component is released because it is an inductive load, and the voltage at the time of current zero crossing due to the low power factor is high.) Due to the voltage, electrons are emitted from the contact surface, and the arc is continued again, which leads to a failure in breaking, causing troubles such as burning.

In the case of a normal relay, a contact made of an Ag-based contact material is mounted, and the contact surface temperature rises due to a breaking arc, but does not reach the temperature at which electrons are emitted because the melting point of the contact material is low. [Low-melting point materials have a low work function and tend to emit electrons even at low voltage. Does not lead to electron emission.] Therefore, even if a high re-start voltage is applied, no transition to an arc occurs, so that re-ignition (interruption failure) does not occur.

The present invention has been made in view of the above description, and the contact does not become high in temperature with respect to the arc at the time of interruption.
An object of the present invention is to provide a relay capable of improving the breaking performance.

[0020]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides an arc contact pair having excellent welding resistance and a main contact pair having a low contact resistance, which are connected in parallel with each other, and a respective contact pair. A movable member for driving the movable side of the contact, and an electromagnet device for driving the movable member, at least one of the two contact pairs so as to separate the main contact pair in a state where the arc contact pair is separated during the opening operation. Is provided with a holding mechanism that holds the contact in a contact state by the magnetic attraction of a permanent magnet.The arc at the time of closing operation is generated at the arc contact pair with excellent welding resistance, so it has excellent welding resistance. The arc contact pair does not cause any welding trouble, and the current is interrupted by the main contact pair with low melting point and low contact resistance during opening operation, so that interruption failure does not occur and the interruption performance is improved. A.

According to a second aspect of the present invention, at least one of the movable main contact terminal portion provided with the movable main contact and the fixed main contact terminal portion provided with the fixed main contact has a permanent magnet. Are arranged respectively,
If a holding mechanism is provided to hold the main contact pair in a contact state by a magnetic attraction force acting between the two electromagnetic members at least until the arc contact pair is separated during the opening operation, the main contact is provided by the magnetic attraction force acting between the two electromagnetic members. The contact pressure of the pair is increased, and the contact reliability at the time of closing is improved.

According to a third aspect of the present invention, a movable arc contact terminal portion provided with a movable-side arc contact and urged in a direction in which the pair of arc contacts is separated from each other is provided. And a movable member that is driven in the contact direction, at least one of which is provided with an electromagnetic member that is a permanent magnet,
If a holding mechanism is provided to hold the pair of arc contacts in contact with the magnetic attraction force acting between the two electromagnetic members at least until the main contact pair contacts at the time of the closing operation, the arc contact is provided by the magnetic attraction force acting between the two electromagnetic members. The contact pressure of the pair is increased, and the bounce of the arc contact pair during the closing operation is reduced.

Further, when the electromagnetic member having at least one of a permanent magnet is disposed on each of the movable arc contact terminal portion and the second movable member interlocking with the movable member, the opening operation is performed. Even if magnetic attraction is applied between the second movable member and the two electromagnetic members disposed on the movable arc contact terminal portion, the movable member drives the movable-side arc contact in the separating direction. The contact pair does not come into contact again during the opening operation.

According to a fifth aspect of the present invention, at least one of the arc contact pairs is formed by adding an additive such as Ag, C, Cu, In, or Cd to a material having excellent durability such as tungsten. Then, the temperature rise of the arc contact pair is suppressed, and re-ignition due to thermionic emission can be prevented.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) The basic configuration of the present embodiment is the same as that of the above-described conventional example, so that illustration and description of common parts are omitted, and only the features that are the features of the present embodiment will be described. In the present embodiment, as shown in FIGS. 1 and 2, the permanent magnet 68 is fixed to the second terminal 43 to which the main fixed contact 50 is fixed so as to be adjacent to the main fixed contact 50.
And a conductive plate 69 which is attached to the main movable spring 46 and is made of an electromagnetic member capable of exerting a magnetic attraction between the permanent magnet 68 and the permanent magnet 68. At the time of the opening operation, at least the arc contact pairs 47 and 51 are separated. Up to the main contact pair 45, by magnetic attraction acting between the permanent magnet 68 and the conductive plate 69.
The main feature is that a holding mechanism for holding the contact 50 is provided. As shown in FIG. 2, an electromagnetic iron piece 70 magnetically coupled to the permanent magnet 68 is fixed to the second terminal portion 43.

The tip of the main movable spring 46 is shown in FIG.
As shown in the figure, the card 55 is disposed between a first pressing portion 72 and a second pressing portion 73 which are protruded from the free end side end portion of the card 55 so as to face each other. That is, in the closing operation, when the card 55 is rotated by the electromagnet device 5, the main movable spring 46 is pushed and driven by the first pressing portion 72, and the main movable contact 45 contacts the main fixed contact 50 to turn on. Become. Although not shown in FIG. 1, the arc movable spring 48 to which the arc movable contact 47 is fixed is a normal lift-off spring, and the card 55
When not being pushed by the pushing portion 66, the arc movable contact 47 is brought into contact with the arc fixed contact 51 to be turned on. Thus, during the closing operation, the first pressing portion 7
2, the main movable spring 46 is pressed and the main contact pair 4
The pressing force of the pressing portion 66 is released before the contact of the arc movable contact 47 with the arc fixed contact 51 by the restoring force of the arc movable spring 48, so that the arc movable contact 47 contacts the arc fixed contact 51 before the main contact pair 45, 50. The arc contact pairs 47 and 51 are turned on, and even if an arc is generated at the arc contact pairs 47 and 51 due to contact bounce or the like, there is no possibility of contact welding.

It should be noted that Ag, C, Cu, In,
It is also preferable to use a contact containing an additive such as Cd. When this additive is included, even if it is included as an alloy, Ag, C, Cu, In,
A metal portion such as Cd may be formed. In this case, the arc contact pairs 47 and 51 having excellent welding resistance generate heat when becoming an anode (+ pole) at the time of interruption, reverse polarity at the time of current zero crossing, become a cathode and emit electrons to re-ignite. Ag, C,
The structure including additives such as Cu, In, and Cd has an advantage that the temperature rise is suppressed and restriking is suppressed.

On the other hand, at the time of the opening operation, the card 55 rotates in the direction opposite to that at the time of the closing operation, and the pressing applied by the first pressing portion 72 to the main movable spring 46 is released.
In this embodiment, since the magnetic attraction force acts between the permanent magnet 68 and the conductive plate 69, the main fixed contact 50 and the main movable contact 45 are kept in contact. Then, the card 55 further rotates, and the second pressing portion 73 abuts on the main movable spring 46, and the main movable contact 45 is fixed to the main movable contact 45 by the pressing force applied from the second pressing portion 73 with the rotation of the card 55. The contact 50 is opened. As the card 55 rotates, the pressing portion 66 applies a pressing force to the arc movable spring 48, so that the arc contact pairs 47 and 51 are separated from each other. Since the contact mechanism is held by the holding mechanism of the permanent magnet 68 and the conductive plate 69, the arc contact pairs 47 and 51 are already opened when the main contact pairs 45 and 50 are opened.

That is, at the time of the opening operation, the arc contact pairs 47 and 51 formed of a material having a high resistance to welding (a high melting point metal material) such as tungsten are first opened, and then A
g, the main contact pairs 45 and 50 formed of a material having a low contact resistance (low-melting metal material) are cut off to cut off the current, so that the main contact pair 45 formed of a low-melting metal material is used. , 50 can be reliably cut without increasing the contact temperature. As a result, a disconnection failure as in the related art does not occur, and the disconnection performance as a relay can be improved. When the main contact pairs 45 and 50 come into contact with each other, there is an advantage that the contact pressure increases due to the magnetic attraction acting between the permanent magnet 43 and the conductive plate 69, thereby improving the contact reliability.

(Embodiment 2) FIG. 3 shows Embodiment 2 of the present invention.
It is a top view which shows the principal part of. In the present embodiment, the card 55
A permanent magnet 74a is fixed to the tip of a projecting piece 74 protruding from the free end side tip portion toward the arc movable spring 48, and an electromagnetic force is applied to the tip portion of the arc movable spring 48 to which the arc movable contact 47 is fixed. It is characterized in that a suction plate 75 made of a member is fixed, and other basic configurations and operations are common to the conventional example and the first embodiment. Therefore, illustration and description of common parts are omitted.

FIG. 3 shows the relay in the off state (main contact pair 4
5, 50 and the arc contact pairs 47, 51 are off)
However, the main movable spring 46 whose leading end is supported by the support portion 67 of the card 55 holds the main movable contact 45 and the main fixed contact 50 separated from each other by its own spring force. On the other hand, in this state, since the distance between the permanent magnet 74a at the tip of the protruding piece 74 protruding from the card 55 and the attraction plate 75 fixed to the arc movable spring 48 is small, the magnetic attractive force acting between the two. As a result, the arc movable spring 48 is pulled in the contact direction of the arc contact pairs 47 and 51, and the contact of the arc contact springs 47 and 51 is prevented by contacting the pressing portion 66 of the card 55 with the arc movable spring 48. ing.

At the time of the closing operation, the position of the pushing portion 66 also moves with the rotation of the card 55, so that the arc movable spring 48 pulled by the magnetic attraction force of the permanent magnet 74a as shown in FIG. The contact is bent in the contact direction of the pair 47, 51, and eventually, as shown in FIG.
Contact. Here, in the state of FIG.
The contacts 5 and 50 are also pressed by the support portion 67 with the rotation of the card 55 and come into contact, but come into contact after the arc contact pairs 47 and 51. When the card 55 is further rotated, the permanent magnet 7
The distance between 4a and the suction plate 75 fixed to the arc movable spring 48 increases, and the magnetic attraction does not work. As a result, in the final ON state (closed state) of the relay shown in FIG. 6, the arc movable spring 48 released from the magnetic attraction force separates the arc contact pairs 47 and 51 by its own returning force. That is, FIG.
As shown in FIG. 3D, the relay shifts from the OFF state to the ON state through the states shown in FIGS. 3 to 6. Since the contacts 47 and 51 are brought into contact first, there is no risk of contact welding even if an arc is generated at the arc contact pairs 47 and 51 due to contact bounce or the like.

On the other hand, in the opening operation, the return speed of the main movable spring 46 causes the rotation speed of the card 55 to be faster than that in the closing operation, so that the magnetic movable spring of the projection 74 uses the magnetic attraction of the permanent magnet 74a. The pushing portion 66 of the card 55 comes into contact with the arc movable spring 48 before the 48 is pulled,
The state shown in FIG. 6 shifts to the state shown in FIG. 4 without passing through the state shown in FIG. 5, and the main contact pairs 45 and 50 are separated without the arc contact pairs 47 and 51 coming into contact.

That is, also in the present embodiment, during the opening operation, the Ag contacts 47 and 51 formed of a material having a high resistance to welding (a high melting point metal material) such as tungsten are opened and Ag is opened. Contact 4 made of a material having a low contact resistance (a low melting point metal material) such as
Since the currents are cut off due to the disconnection of the electrodes 5, 50, the contact temperature of the main contact pairs 45, 50 formed of a low melting point metal material does not increase, and the arc can be reliably cut off. Such interruption failure does not occur, and the interruption performance as a relay can be improved. Moreover, during the closing operation, the contact pressure of the arc contact pairs 47 and 51 increases due to the magnetic attraction acting between the permanent magnet 74a and the attraction plate 75, and the contact bounce at the time of contact is reduced to suppress the occurrence of arc. be able to.

(Embodiment 3) FIG. 8 shows Embodiment 3 of the present invention.
FIG. In this embodiment, a permanent magnet 77 is fixed to the tip portion, and the second card 76 is slidably disposed on the contact base 7, and is fixed to the tip portion of an arc movable spring 48 formed in a flat plate by an electromagnetic member. Suction plate 7
5 is provided, and the other basic configuration and operation are common to the conventional example and the first and second embodiments. Therefore, illustration and description of common parts are omitted.

The second card 76 has a first card near the rear end portion and the center portion opposite to the front end portion to which the permanent magnet 77 is fixed.
The projection 78 and the second projection 79 project in the same direction. As shown in FIGS. 9 and 10, these first and second protrusions 78, 79 of the card 55 are inserted into a gap formed between a wall 80 provided in the contact base 7 and an inner surface of the contact base 7. It is slidably arranged toward the direction. The wall 80 is provided with a pair of projections 80 a for pinching, and these projections 80 a are in contact with the side surface of the second card 76. Further, a tip 55 a of the card 55 is disposed between the first projection 78 and the second projection 79.
Therefore, when the card 55 is rotated by the electromagnet device 5,
The tip 55a contacts the first projection 78 and the second projection 79, and the second card 76 is pushed.

FIG. 10 shows an OFF state of the relay (a state where both the main contact pairs 45 and 50 and the arc contact pairs 47 and 51 are OFF).
The main movable spring 46 supported by 7 maintains an open state between the main movable contact 45 and the main fixed contact 50 by its own spring force. On the other hand, in this state, the card 55
Of the second card 76 presses the first projection 78 of the second card 76, and the permanent magnet 77 fixed to the tip of the second card 76 and the suction plate 7 fixed to the arc movable spring 48.
Since the distance between the arc contact spring 4 and the arc contact spring 4 is small due to the magnetic attraction acting between the two.
The arc contact springs 47 and 51 are pulled in the contact direction of the arc contacts 7 and 51, but the contact portions of the arc contacts 47 and 51 are prevented from coming into contact by bringing the pushing portion 66 of the card 55 into contact with the arc movable spring 48. In addition, the arc movable spring 48 is in the natural state,
In the off state shown in FIG. 10, the card 7 is pushed by the pushing portion 66 of the card 55 to be outside the natural state (in a direction in which the arc contact pairs 47 and 51 are separated). It is being spread.

At the time of the closing operation, the position of the pushing portion 66 also moves with the rotation of the card 55, and therefore, as shown in FIG. The movable spring 48 is the arc contact pair 4
The contact points 7 and 51 are bent in the contact direction, and the arc contact pairs 47 and 51 come into contact with each other as shown in FIG. Here, in the state of FIG. 12, the main contact pairs 45 and 50 are also pressed by the support portion 67 as the card 55 rotates and come into contact with the main contact pairs 45 and 50, but come into contact after the arc contact pairs 47 and 51. (See FIG. 14). When the card 55 further rotates, the second
The tip 76 a of the card 76 abuts on the second protrusion 79 to push the second card 76, so that the permanent magnet 77 fixed to the tip of the second card 76 and the arc movable spring 48 are fixed. The magnetic attraction force does not work because the distance between the attraction plate 75 and the attraction plate 75 is large. As a result, in the final ON state (closed state) of the relay shown in FIG. 13, the arc movable spring released from the magnetic attraction force. 48 returns to its natural position by its own restoring force, and the arc contact pair 4
7, 51 are separated. That is, FIG.
As shown in (d), the relay shifts from the off state to the on state through each state of FIGS.
As in the first and second embodiments, the arc contact pairs 47 and 51 are brought into contact earlier than the main contact pairs 45 and 50. Therefore, even if an arc is generated at the arc contact pairs 47 and 51 due to contact bounce or the like, contact welding is performed. There is no danger of occurrence.

On the other hand, at the time of the opening operation, FIG.
As shown in (d), since the main movable spring 46 returns to the natural position by its own return force with the rotation of the card 55, the main contact pairs 45 and 50 are opened to cut off the current. At this time, the tip 55a of the card 55, which has been in contact with the second protrusion 79, is rotated by the rotation of the second card 76 to the first position.
Until the protrusion 78 is pressed against the projection 78, the state shown in FIG. Then, the tip 5 of the card 55
When the first protrusion 5a starts to drive the first protrusion 78, the pressing portion 66 of the card 55 is in contact with the arc movable spring 48. Even if the distance therebetween is reduced, the movement of the arc movable spring 48 is regulated by the pushing portion 66, and the contact between the arc contact pairs 47 and 51 is prevented.

That is, also in this embodiment, during the opening operation, when the arc contact pairs 47 and 51 made of a material having a high resistance to welding (a high melting point metal material) such as tungsten are opened, Ag is opened. Contact 4 made of a material having a low contact resistance (a low melting point metal material) such as
Since the currents are cut off and the currents are cut off (see FIG. 17), the main contact pairs 45, made of a low melting point metal material are used.
The arc can be reliably turned off without increasing the contact temperature of the contact 50, and a breaking failure unlike the related art does not occur, and the breaking performance as a relay can be improved. In addition, during the closing operation, the permanent magnet 7 of the second card 76 is
The contact pressure of the pair of arc contacts 47 and 51 increases due to the magnetic attraction acting between the suction plate 7 and the suction plate 75, and the bounce of the contact at the time of contact can be reduced to suppress the occurrence of arc.

Further, in the case of the second embodiment, when the distance between the permanent magnet 74a of the card 55 and the suction plate 75 of the arc movable spring 48 is reduced during the closing operation, the arc contact pairs 47 and 51 come into contact. According to the present embodiment, the permanent magnet 77 is provided on the second card 76 that is slid by the card 55, as shown in FIGS. 16C and 16D. During the opening operation, the second card 76 returns to the original position after the card 55 rotates to a position where the arc contact pairs 47 and 51 do not come into contact, so that the arc contact pairs 47 and 51 come into contact during the opening operation. There is an advantage that the breaking performance can be improved without turning on.

As shown in FIG. 18, the second card 7
6 is provided with a pair of slide grooves 81 on both sides thereof, and both ends of a leaf spring 82 curving outward are inserted into and fixed to the slide grooves 81, and the leaf spring 82 is fixed to the inner surface or wall of the contact base 7. The second card 76 may be held on the reset side by contacting the side surface of the second card 80 with the pressing force of the leaf spring 82.

[0043]

As described above, the present invention drives an arc contact pair having excellent welding resistance and a main contact pair having a low contact resistance, which are connected in parallel with each other, and a movable contact of each contact pair. A movable member, and an electromagnet device for driving the movable member, wherein at least one of the two contact pairs is separated by a magnetic attraction force of a permanent magnet so that the main contact pair is separated in a state where the arc contact pair is separated during the opening operation. The arc contact during the closing operation is generated at the arc contact pair with excellent welding resistance because the holding mechanism that maintains the contact state is provided, so the arc contact pair with excellent welding resistance does not cause welding trouble. In addition, at the time of the opening operation, the current is interrupted by the main contact pair having a low melting point and a low contact resistance, so that an interruption failure does not occur and the interruption performance is improved.

According to a second aspect of the present invention, at least one of a movable main contact terminal portion provided with a movable main contact and a fixed main contact terminal portion provided with a fixed main contact is a permanent magnet. Each member is disposed, and a holding mechanism for holding the main contact pair in a contact state by magnetic attraction force acting between the two electromagnetic members until at least the arc contact pair is opened at the time of the opening operation, so that between the two electromagnetic members, The working magnetic attraction force increases the contact pressure of the main contact pair, which has the effect of improving the contact reliability at the time of closing.

According to a third aspect of the present invention, there is provided a movable arc contact terminal portion provided with a movable-side arc contact and urged in a direction in which the arc contact pair is separated, and a movable arc contact terminal portion which is connected to the contact direction of the arc contact pair. And a movable member to be driven at least one of which is a permanent magnet, and an arc contact pair is brought into contact by a magnetic attraction force acting between the two electromagnetic members at least during the closing operation until the main contact pair contacts. The contact pressure of the pair of arc contacts increases due to the magnetic attraction that acts between the two electromagnetic members,
There is an effect that the bounce of the arc contact pair during the closing operation is reduced.

According to a fourth aspect of the present invention, since the movable arc contact terminal portion and the second movable member interlocking with the movable member are each provided with an electromagnetic member at least one of which is a permanent magnet, the second member is opened during the opening operation. Even if a magnetic attraction force acts between the movable member and the electromagnetic member disposed at the movable arc contact terminal portion, the movable member drives the movable-side arc contact in the separating direction. There is an effect that the contact does not occur again during the opening operation.

According to the fifth aspect of the present invention, at least one of the arc contact pairs is formed by adding an additive such as Ag, C, Cu, In, or Cd to a material having excellent durability such as tungsten. This has the effect of suppressing the temperature rise of the arc contact pair and preventing re-ignition due to thermionic emission.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a main part showing a first embodiment.

FIG. 2 is a partially omitted perspective view showing a main part of the above.

FIG. 3 is a plan view of a main part of a second embodiment in a closed state.

FIG. 4 is an explanatory diagram for explaining the operation of the above.

FIG. 5 is an explanatory diagram for explaining the operation of the above.

FIG. 6 is an explanatory diagram for explaining the operation of the above.

FIGS. 7A to 7D are explanatory views for explaining a closing operation of the above.

FIG. 8 is an exploded perspective view showing a third embodiment.

FIG. 9 is a partially omitted plan view showing a main part of the above.

FIG. 10 is an explanatory diagram for explaining the operation of the above.

FIG. 11 is an explanatory diagram for explaining the above operation.

FIG. 12 is an explanatory diagram for explaining the operation of the above.

FIG. 13 is an explanatory diagram for explaining the above operation.

FIG. 14 is an explanatory diagram for explaining a closing operation of the above.

FIGS. 15A to 15D are explanatory diagrams for explaining a closing operation of the above.

FIGS. 16 (a) to (d) are explanatory diagrams for explaining the opening operation of the above.

FIG. 17 is an explanatory diagram for explaining the opening operation of the above.

FIG. 18 is an exploded perspective view showing another configuration of the second card in the above.

FIG. 19 is an exploded perspective view showing a conventional example.

FIG. 20 is a perspective view further disassembled when viewed from a different direction from FIG. 12;

FIG. 21 is a front view of the same assembled state.

22A and 22B show an assembled state of the electromagnet block, wherein FIG. 22A is a cross-sectional view as viewed from the front, FIG.
(C) is a right side view, and (d) is a cross-sectional view seen from a plane.

FIG. 23 shows an assembled state of the above contact block;
(A) is a front view, (b) is a side view, (c) is a rear view,
(D) is a plan view, and (e) is a bottom view.

FIGS. 24A to 24C are explanatory diagrams illustrating a closing operation according to the first embodiment.

FIGS. 25A to 25C are explanatory diagrams illustrating the opening operation of the above.

[Explanation of symbols]

 43 Second Terminal 45 Main Movable Contact 46 Main Movable Spring 50 Main Fixed Contact 55 Card 68 Permanent Magnet 69 Conductive Plate 72 First Pressing Part 73 Second Pressing Part

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 14, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 5

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

According to a fifth aspect of the present invention, at least one of the arc contact pairs is formed by adding an additive such as Ag, C, Cu, In, or Cd to a material having excellent welding resistance such as tungsten. Then, the temperature rise of the arc contact pair is suppressed, and re-ignition due to thermionic emission can be prevented.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction contents]

According to the fifth aspect of the present invention, at least one of the arc contact pairs is formed by adding an additive such as Ag, C, Cu, In, or Cd to a material having excellent welding resistance such as tungsten. This has the effect of suppressing the temperature rise of the arc contact pair and preventing re-ignition due to thermionic emission.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Kutsuna 1048 Kazumasa Kadoma, Osaka Pref.Matsushita Electric Works, Ltd.

Claims (5)

[Claims] 1. An arc contact pair having excellent welding resistance and a main contact pair having low contact resistance, which are connected in parallel with each other, a movable member for driving a movable contact of each of the contact pairs, and a movable member for driving the movable member. A holding mechanism that holds at least one of the two contact pairs in a contact state by a magnetic attraction force of a permanent magnet so that the main contact pair is separated in a state where the arc contact pair is separated during the opening operation. A relay characterized by being provided. 2. An electromagnetic member, at least one of which is a permanent magnet, is provided at each of a movable main contact terminal portion provided with a movable main contact and a fixed main contact terminal portion provided with a fixed main contact. 2. The relay according to claim 1, further comprising a holding mechanism for holding the main contact pair in a contact state by a magnetic attractive force acting between the two electromagnetic members at least until the arc contact pair is separated during the opening operation. 3. A movable arc contact terminal portion provided with a movable arc contact and urged in a direction in which the arc contact pair is separated, and a movable member for driving the movable arc contact terminal portion in a contact direction of the arc contact pair. And a holding mechanism for holding an arc contact pair in a contact state by a magnetic attraction force acting between the two electromagnetic members at least during the closing operation until the main contact pair comes into contact with each other. The relay according to claim 1, further comprising: 4. An electromagnetic member, at least one of which is a permanent magnet, is disposed on each of a movable arc contact terminal portion and a second movable member interlocking with the movable member.
The described relay. 5. A method in which at least one of the arc contact pairs is made of Ag, C, C, etc.
The relay according to any one of claims 1 to 4, wherein the relay is formed including an additive such as u, In, and Cd.