JP2001118450A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device, which allows an increase in an arc voltage generated between contacts and also enables interruption of a high DC voltage. SOLUTION: A contact device of the present invention includes a fixed contactor 21 having a fixed contact 21C; a moving contactor 22 having a moving contact 22A, the moving contact 22A being moved in such a manner that it is in contact with, or separated from the fixed contact 22C; a container receiving the fixed contact 21C and the moving contact 22A; and a driving portion 1 serving to drive the moving contactor 22 such that the moving contactor 22A in contact with, or separated from the fixed contact 21C. The container 25 is formed of an insulating material capable of generating arc-consolidatable gas, and is disposed in the vicinity of the fixed contact 21C and the moving contact 22A. Also, in the container 25, permanent magnets 23 are disposed into which the fixed contact 21C and the moving contact 22A are inserted opposite to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact device suitable for a relay for adding power, an electromagnetic switch, and the like.

[0002]

2. Description of the Related Art Conventionally, as this type of contact device, there is one proposed in, for example, JP-A-8-45411. When an arc is generated between the contacts at the time of opening and closing the electrodes of the switch, the metal scattered from the electrodes, the contacts and the metal in the vicinity thereof by the arc is disposed in the vicinity of the electrodes, the contacts and the metal in the vicinity thereof. The insulating material is made into an insulator by the insulating imparting gas scattered from the gas generating compound.

[0003]

However, in the above-mentioned contact device, since the arc generated between the contacts is not stretched, the rise in the voltage of the arc generated between the contacts is small, and it is difficult to interrupt a high DC voltage. Had the problem that

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to easily increase the voltage of an arc generated between contacts and cut off a high DC voltage. It is to provide a contact device.

[0005]

In order to solve the above-mentioned problems, the present invention provides a fixed contact provided with a fixed contact and a movable contact provided with a movable contact which comes into contact with and separates from the fixed contact. A container that houses the fixed contact and the movable contact, and a drive unit that drives the movable contact to move the movable contact to and away from the fixed contact, a contact device comprising: It has permanent magnets disposed opposite to each other, wherein the container is formed of an insulating material capable of generating an arc-extinguishing gas, and the permanent magnet and the container are disposed near the fixed contact and the movable contact. Features.

Thus, the magnetic action of the permanent magnet causes
The arc is stretched. Further, the arc is cooled by the arc extinguishing gas from the insulating material due to the heat of the arc. Therefore, the arc voltage increases, and it becomes possible to cut off the high DC voltage.

Preferably, a yoke is provided so as to surround the container. Thereby, the magnetic resistance between the two permanent magnets can be reduced, the magnetic flux can be efficiently collected between the contacts, and the size of the permanent magnet can be reduced.

Further, if the yoke is constituted by two yokes each having a substantially L-shaped cross section, the assembling workability is improved.

Further, if the permanent magnets are arranged on the two yokes each having a substantially L-shaped cross section, and the yokes are held by the attraction of the permanent magnets, the assembling workability is further improved.

The insulating material is preferably an unsaturated polyester or a chain compound obtained by adding a metal hydroxide or hydrate. Thus, the withstand voltage degradation characteristics can be improved.

The chain compound is preferably nylon 6 or nylon 66. Thus, the withstand voltage degradation characteristics can be improved.

Preferably, the metal hydroxide is magnesium hydroxide. Thus, the withstand voltage degradation characteristics can be improved.

[0013] Further, in the container, the arc generated between the fixed contact and the movable contact has a slit in a direction in which the arc is extended by the magnetic action of the permanent magnet. The arc length protrudes, the arc voltage increases, and the DC high-voltage breaking performance can be further improved.

[0014] The container may have a metal plate in a portion where the arc generated between the fixed contact and the movable contact is extended by the magnetic action of the permanent magnet. The arc jumps, and the arc voltage increases by the amount of the cathode drop voltage and the anode drop voltage generated in the metal plate, and the DC high voltage cutoff performance can be further improved.

[0015] Further, in the above-mentioned container, if the arc generated between the fixed contact and the movable contact has a projection in a direction in which the arc is extended by the magnetic action of the permanent magnet, the heat of the arc is increased. Since the surface area of the receiving container increases, the amount of the generated arc-extinguishing gas increases, and the DC high-voltage breaking performance can be further improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A contact device according to a first embodiment of the present invention will be described below with reference to FIGS. This contact device includes a drive unit 1, a contact unit 2, and a housing 3.

First, the driving section 1 is configured as follows. This is an electromagnet device having a movable portion 12 which is movable by excitation of a coil 11.
Specifically, the coil 11 is wound around the coil frame 13. The fixed iron core 14 has an insertion hole 13A of the coil frame 13.
At one end is fixed to a yoke 15 surrounding the coil 11. The movable portion 12 is formed in a substantially cylindrical shape, and a drive pin 12A is fixed to one end thereof. When the coil 11 is excited, the movable portion 12 moves toward the fixed iron core 14 along the insertion hole 13A.

The movable portion 12 is provided on the housing body 31.
Is mounted inside. The housing body 31 has an opening 3
1A is formed, and the drive pin 12A is configured to protrude from the opening 31A. A movable contact 22 to be described later is fixed via a holder 16 to an end of the drive pin 12A protruding from the opening 31A.

Next, the contact section 2 will be described. Reference numerals 21 and 21 denote fixed contacts, which are made of copper-based plate material and have terminals 21A and 21A.
And connecting portions 21B, 21B bent and connected substantially at right angles from one ends of the terminals 21A, 21A, and connecting portions 21B, 21B.
The fixed contacts 21D, 21 are bent at substantially right angles from the other end of the
It has contact fixing portions 21C and 21C to which D is fixed, and is formed in a substantially U-shape with the terminal 21A, the connecting portion 21B and the contact fixing portion 21C.

Reference numeral 22 denotes a movable contact, which is formed in a substantially flat plate shape from a copper-based plate material, and has movable contacts 22A, 22A which are spaced from the fixed contacts 21D.
It is fixed to the movable contact 22 by a method such as brazing so as to face 21D.

Reference numerals 23, 23 denote permanent magnets, and the movable contacts 22 are extended so that arcs 24 generated between the contacts when current is interrupted are extended in the direction of both ends of the movable contact 22 (in the direction of → in FIG. 2) by magnetic action. Along the fixed contact 21D and the movable contact 22A along the longitudinal direction of the
The movable contact 22A and the movable contact 22A are disposed in parallel to face each other. For example, as shown in FIG. 3, the N pole and the S pole of the permanent magnets 23 are taken, and the movable contact 22A is fixed to the fixed contact 21D.
When the direction of the current is taken in the direction (→ direction in FIG. 3), the arc 24 is directed to both ends of the movable contact 22 (direction ⇒ in FIG. 3)
Will be stretched.

In this embodiment, the permanent magnet 23 is provided on a surface 25A along a longitudinal direction of a container 25 described later.
Is arranged on the outer surface of the surface 25A, but is not limited to this.
A permanent magnet 23 may be provided instead of A.

Reference numeral 25 denotes a container, which is formed of an insulating material capable of generating an arc-extinguishing gas. The container 25 is arranged near the contact so that the contact is accommodated in the container 25. The container 25 has an opening 25B through which the holder 16 passes and an opening 25C through which the connecting portion 21B of the fixed contact 21 passes. In addition, the container 25 forms a side surface of the container 25 by a surface 25A along the longitudinal direction of the movable contact 22 and a surface 25D substantially perpendicular to the surface 25A.

Here, the insulating material constituting the container 25 is preferably an unsaturated polyester or a chain compound obtained by adding a metal hydroxide or hydrate to a chain compound. As the chain compound, nylon 6 or nylon 66 is preferable. Further, as the metal hydroxide, magnesium hydroxide is preferable. By using the above materials as the insulating material, the withstand voltage deterioration characteristics can be improved.

The housing 3 includes a housing main body 31 and a cover 32. The drive section 1 and the contact section 2 are positioned by pressing the cover 32 against the housing main body 31 so as to cover the contact section 2. The movement amount in the contact contact / separation direction of No. 12 is constant.

Therefore, in the present embodiment, the arc 24 is extended in the direction of both ends of the movable contact 22 (the direction of → in FIG. 2) by the magnetic field of the permanent magnet 23. Further, the arc 24 is cooled by the arc-extinguishing gas from the insulating material due to the heat of the arc 24. As described above, the arc voltage increases, and it becomes possible to cut off the high DC voltage.

In the present embodiment, the container 25
Are arranged so as to surround the contacts, but the present invention is not limited to this, and only the direction in which the arc 24 is elongated (the surface 25D of the container 25) or only the surface 25A may be formed.

Further, although the two permanent magnets 23 are arranged facing each other and parallel to each other, the present invention is not limited to this. All that is required is that they are arranged.

Further, in the present embodiment, the fixed contact 21 is formed in a substantially U-shape. However, the present invention is not limited to this, and at least the fixed contact 21D and the movable contact 22A can be separated from each other. The movable contact 21 may have any shape as long as it has a simple configuration.

[Second Embodiment] A contact device according to a second embodiment of the present invention will be described below with reference to FIG. The contact device according to the present embodiment has a configuration in which the container 25 is surrounded by yokes 26A and 26B having a substantially L-shaped cross section in the contact device according to the first embodiment. Here, the permanent magnets 23 are fixed to the yokes 26A and 26B with a magnetic force, an adhesive, or the like. And the yokes 26A, 26
B is held by the container 25 so as to sandwich the container 25 by the magnetic force of the permanent magnet 23.

With the configuration of this embodiment, in addition to the effects of the first embodiment, the permanent magnets 23 and
The magnetic resistance between the contacts 23 can be reduced, the magnetic flux can be efficiently collected between the contacts, and the size of the permanent magnet 23 can be reduced.

The yokes 26A and 26B are connected to the permanent magnet 2
3 and 23 are attracted to each other by the suction force of each other, so that the yokes 26A and 26B
It does not need to be fixed to the device, and the assembling workability is improved.

In the present embodiment, the section L
Although the container 25 is surrounded by the two Y-shaped yokes 26A and 26B, the present invention is not limited to this, and the container 25 may be surrounded by one yoke. However, if the container 25 is surrounded by the two yokes 26A and 26B, the assembling workability is improved.

In the present embodiment, the permanent magnets 23 are provided on the yokes 26A and 26B. However, the present invention is not limited to this, and the permanent magnets 23 may be provided on the container 25 or the like.

[Third Embodiment] A contact device according to a third embodiment of the present invention will be described below with reference to FIGS. The contact device according to the present embodiment has a configuration in which a plurality of slits 25E are provided on the surface 25D of the container 25 in the contact device according to the first or second embodiment.

With the configuration of the present embodiment, in addition to the effects of the first or second embodiment, the arc 24 protrudes from the plurality of slits 25E as shown in FIG. Accordingly, the arc length is increased, the arc voltage is increased, and the performance of cutting off a high DC voltage can be further improved.

[Fourth Embodiment] A contact device according to a fourth embodiment of the present invention will be described below with reference to FIGS. The contact device according to the present embodiment is the contact device according to any of the first to third embodiments, wherein a plurality of metal plates 25F are provided on the surface 25D of the container 25 by a method such as integral molding. It is.

With the configuration of this embodiment, in addition to the effects of any of the first to third embodiments, the arc 24 jumps to the metal plate 25F as shown in FIG. Then, as shown in FIG. 9, the arc voltage increases by the amount of the cathode drop voltage and the anode drop voltage generated in the metal plate 25F, and the DC high-voltage cutoff performance can be further improved.

[Fifth Embodiment] A contact device according to a fifth embodiment of the present invention will be described below with reference to FIG. The contact device according to this embodiment is the same as the contact device according to any of the first to fourth embodiments, except that
Is provided with a plurality of projections 25G on the surface 25D.

According to the structure of this embodiment, in addition to the effects of any of the first to fourth embodiments, the surface area of the container 25 receiving the heat of the arc 24 increases.
The amount of generated arc-extinguishing gas increases, and the DC high-voltage breaking performance can be further improved.

[0041]

As described above, according to the first aspect of the present invention, there is provided a fixed contact provided with a fixed contact, a movable contact provided with a movable contact which comes into contact with and separates from the fixed contact, and the fixed contact provided with the fixed contact. And a container for housing the movable contact, and a driving unit that drives the movable contact to move the movable contact to and away from the fixed contact, wherein the contact device has the fixed contact and the movable contact interposed therebetween. Since the container is formed of an insulating material capable of generating an arc-extinguishing gas and the permanent magnet and the container are arranged near the fixed contact and the movable contact, the permanent magnet The magnetic action of
The arc is stretched, the arc is cooled by the arc-extinguishing gas from the insulating material due to the heat of the arc, and the voltage of the arc generated between the fixed contact and the movable contact is easily increased, thereby cutting off the DC high voltage. It was possible to provide a contact device capable of performing the above.

According to the second aspect of the present invention, there is provided the first aspect.
In the contact device described above, since the yoke surrounding the container is provided, in addition to the effect of the invention described in claim 1, the magnetic resistance between the two permanent magnets is reduced, and between the fixed contact and the movable contact. The magnetic flux can be efficiently collected, and the size of the permanent magnet can be reduced.

According to the third aspect of the present invention, there is provided the second aspect.
In the contact device described above, the yoke is constituted by two yokes each having a substantially L-shaped cross section, so that the assembling workability is improved in addition to the effect of the invention described in claim 2.

In the invention according to claim 4, claim 3
4. The contact device according to claim 3, wherein the permanent magnet is disposed on the two yokes each having a substantially L-shaped cross section, and the yoke is held by the attraction force of the permanent magnet. In addition, assembling workability is improved.

In the invention according to claim 5, claim 1 is
5. The contact device according to claim 1, wherein the insulating material is an unsaturated polyester.
In addition to the effects of the invention described in any one of claims 4 to 4,
It is possible to improve the withstand voltage degradation characteristics.

In the invention according to claim 6, claim 1 is
The contact device according to any one of claims 1 to 4, wherein the insulating material is obtained by adding a metal hydroxide or a hydrate to a chain compound. In addition to the effects of the described invention, the withstand voltage degradation characteristics can be improved.

In the invention according to claim 7, claim 6
In the contact device described above, the chain compound is nylon 6 or nylon 66, so that in addition to the effect of the invention described in claim 6, it is possible to improve the withstand voltage deterioration characteristics.

In the invention according to claim 8, claim 6
In the contact device described above, since the metal hydroxide is magnesium hydroxide, it is possible to improve the withstand voltage degradation characteristics in addition to the effect of the invention described in claim 6.

According to the ninth aspect of the present invention, there is provided the first aspect.
9. The contact device according to claim 8, wherein the container has a slit in a direction in which an arc generated between the fixed contact and the movable contact is elongated by a magnetic action of the permanent magnet. 10. In addition to the effect of the invention according to any one of claims 1 to 8, the arc protrudes from the slit, the arc length increases, the arc voltage increases, and the DC high voltage breaking performance is further improved. Can be.

According to a tenth aspect of the present invention, in the contact device according to any one of the first to ninth aspects,
The said container has a metal plate in the part where the arc produced between the fixed contact and the movable contact is extended by the magnetic action of the permanent magnet, so that the metal plate is provided.
In addition to the effects of the invention according to any one of claims 9 to 9,
The arc jumps to the metal plate, and the arc voltage rises by the amount of the cathode drop voltage and the anode drop voltage generated in the metal plate, and the DC high voltage cutoff performance can be further improved.

According to the eleventh aspect of the present invention, in the contact device according to any one of the first to tenth aspects, the container has an arc generated between the fixed contact and the movable contact. 2. A projection portion is provided at a portion extending in a direction in which the permanent magnet is stretched by a magnetic action.
In addition to the effects of the invention according to any one of claims 10 to 10, since the surface area of the container receiving the heat of the arc increases, the amount of generated arc-extinguishing gas increases, and the DC high-voltage breaking performance is further improved. Can be enhanced.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a contact device according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the contact portion of the same.

FIG. 3 is an operation explanatory view of a contact portion of the above.

FIG. 4 is a side sectional view of a contact portion according to a second embodiment of the present invention.

FIG. 5 is a partial perspective view of a container according to a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of the operation of the contact portion of the above.

FIG. 7 is a partial perspective view of a container according to a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram of the operation of the contact section of the above.

FIG. 9 is a characteristic diagram of the arc voltage according to the first embodiment;

FIG. 10 is a partial perspective view of a container according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive part 2 Contact part 3 Housing 11 Coil 12 Movable part 12A Drive pin 13 Coil frame 13A Insertion hole 14 Fixed iron core 15 Yoke 16 Holder 21 Fixed contact 21A Terminal 21B Connecting part 21C Contact fixing part 21D Fixed contact 21E Arc traveling plate 22 Movable contact 22A Movable contact 22B Arc running plate 23 Permanent magnet 24 Arc 25 Container 25A surface 25B, 25C Opening 25D surface 25E Slit 25F Metal plate 25G Projection 26A, 26B Yoke

Claims (11)

[Claims] 1. A fixed contact provided with a fixed contact, a movable contact provided with a movable contact that comes into contact with and separated from the fixed contact, a container for storing the fixed contact and the movable contact, and a movable contact provided with the fixed contact. And a drive unit for driving the movable contact so as to contact and separate the movable contact from the contact unit. A contact device formed of an insulating material capable of generating an inert gas, wherein the permanent magnet and the container are arranged near the fixed contact and the movable contact. 2. The contact device according to claim 1, further comprising a yoke surrounding the container. 3. The contact device according to claim 2, wherein said yoke comprises two yokes each having a substantially L-shaped cross section. 4. The contact device according to claim 3, wherein said permanent magnet is disposed on said two yokes each having a substantially L-shaped cross section, and said yoke is held by an attractive force of said permanent magnet. . 5. The contact device according to claim 1, wherein the insulating material is an unsaturated polyester. 6. The contact device according to claim 1, wherein the insulating material is obtained by adding a metal hydroxide or a hydrate to a chain compound. 7. The contact device according to claim 6, wherein the chain compound is nylon 6 or nylon 66. 8. The contact device according to claim 6, wherein the metal hydroxide is magnesium hydroxide. 9. The container according to claim 1, wherein an arc generated between the fixed contact and the movable contact has a slit in a direction in which the arc is elongated by a magnetic action of the permanent magnet. The contact device according to claim 8. 10. The container according to claim 1, wherein an arc generated between the fixed contact and the movable contact has a metal plate in a direction in which the arc is extended by a magnetic action of the permanent magnet. The contact device according to claim 9. 11. The container according to claim 1, wherein an arc generated between the fixed contact and the movable contact has a protrusion at a portion in a direction in which the arc is elongated by a magnetic action of the permanent magnet. The contact device according to claim 10.