KR102009875B1 - DC Bi-Directional Contact Device - Google Patents

Abstract

The present invention relates to a DC bi-directional contact device having an arc extinction function of a DC power source, capable of blocking and controlling all currents in the forward direction and the reverse direction when charging and discharging a battery. The DC bi-directional contact device comprises: a pair of fixing contacts including a first fixing contact and a second fixing contact to apply a DC power source; a movable contact capable of moving to come in contact with the pair of fixing contacts; two pairs of permanent magnets arranged on the outside of the pair of fixing contacts for arc extinction; and a ceramic chamber having a space in which the fixing contact and the movable contact are arranged inside.

Description

DC Bi-Directional Contact Device

The present invention relates to a direct current bidirectional contact device having an arc extinguishing function of a direct current power source. More specifically, the present invention relates to a switch for controlling the power of a secondary battery, such as a lithium battery, which can be controlled regardless of the direction of the direct current at the time of charging and discharging.

Bidirectional switch contact devices can be used in direct current transport systems such as solar power generation, energy storage devices, rapid charging devices, uninterruptible power systems (UPS), and the like.

The UPS and the energy storage device receive electric current from the commercial power source to charge the battery, and the charged energy can supply the commercial power through the bidirectional inverter or power the load when the battery is used. .

A bidirectional switch device can be used between the battery and the inverter to act as an isolation switch or to cut off the fault current. In a circuit in which the battery is frequently charged and discharged, the direct current flows to the switch device in a direction opposite to the forward direction. As such, since the bidirectional switch device is used in both charging and discharging modes, a switch capable of blocking both forward and reverse currents is required.

KR 10-1649703 B1

An object of the present invention is to provide a bidirectional switch contact device capable of blocking and controlling both forward and reverse currents during charging and discharging of a battery.

In addition, the present invention, by arranging the arc arc permanent magnet outside the ceramic chamber of the airtight contact box, the arc is absorbed by the permanent magnet which is a problem due to the internal arrangement of the fixed contact used in the conventional apparatus, the problem of breaking the insulation. It is an object of the present invention to provide a switch contact device which can prevent the arc extinguishing power from being reduced by arranging the arc extinguishing permanent magnet in close proximity to the fixed contact while ensuring an insulation distance from the arc.

In addition, the present invention prevents dielectric breakdown that may occur when the current in both directions is interrupted, and the arc extinguishing permanent magnet is disposed outside the airtight contact box, thereby effectively utilizing the arc extinguishing space between the movable contact and the fixed contact. It is an object to provide a miniaturized bidirectional switch contact device.

In addition, an object of the present invention is to supply power to the coil of the switch contact device to move the movable contact to safely energize and cut off the load current between the power and the load connected to the fixed contact.

In addition, an object of the present invention is to implement a bidirectional current blocking device that does not cause a problem in the current blocking and control even if the direction of the current changes in the device having a state of charge and discharge, such as energy storage devices such as ESS.

The technical problems of the present invention are not limited to the above-mentioned contents, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

In one embodiment of the present invention, a DC bidirectional contact device having an arc extinguishing function of a DC power supply, comprising: a pair of fixed contacts including a first fixed contact and a second fixed contact for applying a DC power source; A movable contact moveable to be in contact with the pair of fixed contacts; Two pairs of permanent magnets disposed outside said pair of fixed contacts for arc extinguishing; And a ceramic chamber configured to have a space in which the fixed contact point and the movable contact point can be disposed.

Here, both pairs of permanent magnets may be disposed outside the ceramic chamber with respect to the pair of fixed contacts.

In addition, the two pairs of permanent magnets may be arranged side by side in a direction parallel to the longitudinal direction of the movable contact, respectively.

Further, a first pair of permanent magnets of the two pairs of permanent magnets is disposed opposite to both sides with respect to the first fixed contact, and a second pair of permanent magnets of the two pairs of permanent magnets is the second fixed magnet. It may be arranged opposite to both sides about the contact point.

Further, the first pair of permanent magnets and the second pair of permanent magnets may be disposed in the forward and reverse directions, respectively, to have opposite polarities.

In addition, the DC bidirectional contact device may further include a pair of permanent magnet holders for fixing each pair of permanent magnets of the two pairs of permanent magnets and preventing magnetic leakage to the outside. Here, the pair of permanent magnet holders may include a first permanent magnet holder for fixing the first pair of permanent magnets and a second permanent magnet for fixing the second pair of permanent magnets.

Here, each of the two pairs of permanent magnets may include a groove on at least one surface to secure the fitting portion of the bobbin together with the permanent magnet holder.

In addition, the pair of permanent magnets may be arranged such that the direction of magnetic flux by the two pairs of permanent magnets is perpendicular to the direction of the arc current when the arc is generated between the movable contact and the fixed contact.

In addition, the DC bidirectional contact device further includes a fixed contact insulator coupled to the fixed contact, the fixed contact insulator may be in the form of a ring. Here, the fixed contact includes a concave portion recessed to form an edge and an inclined portion having an inclination so as to decrease in diameter downward toward the lower portion of the concave portion, and the fixed contact insulator is fitted with the concave portion of the fixed contact. It may include a protrusion that can be swollen.

According to the present invention, it is possible to provide a bidirectional switch contact device capable of blocking and controlling both forward and reverse currents during charging and discharging of a battery.

According to the present invention, it is possible to provide a switch contact device capable of preventing the arc extinguishing power from being reduced by extending the arc drive in the same direction by arranging the arc extinguishing permanent magnets in the forward and reverse directions with respect to the fixed contact, respectively. have.

In addition, according to the present invention, it is possible to prevent the dielectric breakdown phenomenon that may occur when the current in both directions is interrupted, and the polarization arrangement of the pair of permanent magnets in the direction of the current entering and exiting the arc arc permanent magnet to the fixed contact. Through this, it is possible to provide a miniaturized bidirectional switch contact device that can efficiently utilize space while guiding in the same direction to increase magnetic flux density.

In addition, according to the present invention, by supplying power to the coil of the switch contact device to move the movable contact it is possible to safely energize and cut off the load current between the power source and the load connected to the fixed contact.

In addition, according to the present invention, it is possible to implement a bidirectional current blocking device that does not cause a problem in the current blocking and control even if the direction of the current changes in the device having a charged state and a discharge state, such as an energy storage device such as an ESS.

Effects of the present invention are not limited to the above-mentioned matters, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a view for explaining the configuration of a bidirectional switch contact device according to the prior art.
2 is a cross-sectional view for explaining the configuration and operation of a bidirectional switch contact device according to an embodiment of the present invention.
3 is a view for explaining a configuration in which the fixed contact, the movable contact and the arc arc permanent magnet of the bidirectional switch contact device according to an embodiment of the present invention.
4 is a view for explaining the arrangement and role of the arc arc permanent magnet according to an embodiment of the present invention.
5 is a view for explaining the shape of the arc arc permanent magnet according to an embodiment of the present invention.
6 is a view for explaining the coupling relationship of the detailed components of the bidirectional switch contact device according to an embodiment of the present invention.
7A and 7B illustrate a coupling structure of a fixed contact and a fixed contact insulator according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase.

As used herein, "comprises", "comprising" refers to the presence of one or more other components, steps, operations and / or elements, or Does not exclude additional

In addition, terms including ordinal numbers such as first and second used in the present invention may be used to describe components, but the components should not be limited by the terms. These terms are only used to distinguish one component from another. In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, the components shown in the embodiments of the present invention are shown independently to represent different characteristic functions, and do not mean that each component is made of a separate structural unit. That is, each component is described by listing each component for convenience of description, and at least two of the components may be combined to form one component, or one component may be divided into a plurality of components to perform a function. The integrated and separated embodiments of each of these components are also included within the scope of the present invention without departing from the spirit of the invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The construction of the present invention and the effects thereof will be clearly understood through the following detailed description.

1 is a view for explaining the configuration of a bidirectional switch contact device according to the prior art.

In the conventional bidirectional switch device, as shown in FIG. 1, the arc extinguishing magnet 10, which is a permanent magnet for arc extinguishing, is disposed outside both ends of the movable contact 07, and the arc cover 11 located at the upper part of the figure. The arc arc magnet 10 was fixedly arranged inside.

When power is applied to the coil 01, the movable iron core 02, the fixed iron core 03, the yoke 04, and the yoke plate 05 that are movable by the current of the coil 01 are excited, and the movable iron core 02. Moves toward the yoke plate 05. At this time, the movable shaft 06 mechanically connected with the movable iron core 02 moves together, and the movable contact 07 which is connected to the movable shaft 06 and is movable is in contact with the fixed contact 08 located at the upper portion. It is possible. Here, the contact spring 09 serves to apply a contact pressure at the moment when the fixed contact 08 and the movable contact 07 are in contact with each other.

On the other hand, when the power is turned off to the coil 01, the movable iron core 02, the fixed iron core 03, the yoke 04, and the yoke plate 05 are elements, and the movable iron core 02 is a return spring ( It returns to the original state by the force of 12, and the movable contact 07 and the fixed contact 08 are mechanically separated.

When current is flowing through the fixed contact 08 and the movable contact 07, when the fixed contact 08 and the movable contact 07 are separated, an electric arc is generated therebetween. At this time, the electric arc can be extinguished by moving by the arc extinguishing permanent magnet 10.

However, in the conventional bidirectional switch device shown in FIG. 1, since a pair of arc extinguishing permanent magnets 10 are disposed externally in the longitudinal direction of the movable contact 07, respectively, between the two arc extinguishing permanent magnets 10 There is a problem that the arc extinguishing power is reduced because of the distance. In addition, the distance between the fixed contacts 08 is so close that structural problems such as insulation breakdown occur.

2 is a cross-sectional view for explaining the configuration and operation of a bidirectional switch contact device according to an embodiment of the present invention.

Referring to the operation of the bi-directional switch contact device according to the present invention, when the power is applied or turned on the excitation coil 101, the magnetic flux is generated in the movable iron core 102 by the current of the excitation coil 101 fixed iron core Moving toward 103, the movable iron core 102 is mechanically in close contact with the fixed iron core 103 at this time. Accordingly, the movable iron core 102 is connected to the moving shaft 106 to move upward. At this time, the movable contact 106 is made of a contact pressure spring 109 for contact pressure and an insulator on the movable shaft 106 and inserted into a movable contact holder fixed with an insert, and the fixed movable contact 107 moves upward to fix the pair. Both ends of the contact 108 are mechanically connected, and the fixed contact 108 and the movable contact 107 can be electrically connected because they are conductors.

On the other hand, when the current flowing in the excitation coil 101 is removed or turned off to cut off the load current, the movable iron core 102 is demagnetized and operated by the force of the contact spring 109 and the return spring 112. The iron core 102 and the movable contact 107 are returned to the bottom to generate an insulation space between the movable contact 107 and the fixed contact 108. In this case, the movable contact 107 may have a bar shape or a bar shape.

At this time, when the fixed contact 108 and the movable contact 107 are separated from each other, an electric blocking arc occurs between the fixed contact 108 and the movable contact 107, and the arc generated at this moment is a fixed contact ( The arc may be rapidly moved and extinguished by the arc extinguishing permanent magnet 110 existing outside the ceramic chamber 100 where the 108 is disposed. When the arc is rapidly moved by the arc extinguishing permanent magnet 110, the arc is elongated, extinguished, and extinguished, insulation can be restored between the fixed contact 108 and the movable contact 107. More specific arrangement structure and role of the arc arc permanent magnet 110 will be described later with reference to FIGS. 3 and 4.

Referring to FIG. 1, in the bidirectional switch contact device according to an embodiment of the present invention, the arc extinguishing permanent magnet 110 is disposed outside the ceramic chambers on the left and right sides of the fixed contacts 108 (the cross-sectional view of FIG. 1). Only one direction is shown), so that the direction of the magnetic flux is orthogonal to the direction of the arc current, so that the arcs meet each other by inducing the arc by walking the magnetic field of the permanent magnet in the direction of the current and the direction of the current. The arc extinguishing unit can be configured so as not to. In addition, when the current direction is changed, the direction of the arc current is changed so that the device is simplified and miniaturized so that the bidirectional current is blocked in the DC switch device.

In addition, as shown in Figure 1, the bi-directional switch contact device of the present invention by placing the arc extinguishing permanent magnet 110 outside or outside the ceramic chamber 100, which is a hermetic contact box, the inside of the fixed contact used in the conventional apparatus It solves the problem that the arc is absorbed by the permanent magnet, which is a problem caused by the arrangement, to destroy the insulation, and the arc extinguishing force is reduced by arranging the arc extinguishing permanent magnet in close proximity to the fixed contact while ensuring the insulation distance from the arc. You can prevent it. In addition, by arranging the arc extinguishing permanent magnet 110 outside the ceramic chamber 100, a miniaturized bidirectional switch contact device capable of efficiently utilizing the arc extinguishing space between the fixed contact 108 and the movable contact 107 can be provided. Can be.

3 is a view for explaining a configuration in which the fixed contact 108, the movable contact 107 and the arc arc permanent magnet 110 of the bidirectional switch contact device according to an embodiment of the present invention.

Referring to FIG. 3, two pairs of arc extinguishing permanent magnets 110a, 110b, 110c and 110d are disposed outside the ceramic chamber 100 (not shown) with a center between the pair of fixed contacts 108a and 108b. It can have an arrangement structure that not only improves arc extinguishing function, but also efficiently utilizes the limited space of the small switching device.

The two pairs of arc extinguishing permanent magnets 110a, 110b, 110c, and 110d are not disposed on both sides in the longitudinal direction of the movable contact 107, but are arranged side by side in a direction parallel to the longitudinal direction of the movable contact 107, respectively. That is, each pair of permanent magnets 110a, 110b, 110c, and 110d are arranged opposite to each other with respect to each of the fixed contacts 108a and 108b, so that each pair of permanent magnets 110 is connected to both fixed contacts ( Arranged in close proximity to 108 can prevent the arc extinguishing power from being reduced.

4 is a view for explaining the arrangement and role of the arc arc permanent magnet according to an embodiment of the present invention.

Referring to FIG. 4, two pairs of arc extinguishing permanent magnets 110a, 110b, 110c, and 110d are disposed outside the fixed contacts 108a and 108b around a pair of fixed contacts 108a and 108b. The first pair of permanent magnets 110a and 110b are disposed opposite to both sides about the first fixed contact 108a and the second pair of permanent magnets 110c and 110d connect the second fixed contact 108b. It may be disposed opposite to both sides as a center.

At this time, the first pair of permanent magnets (110a, 110b) and the second pair of permanent magnets (110c, 110d) may be disposed in the forward and reverse directions, respectively, to have the opposite polarity, as shown in Figure 4 The permanent magnets 110a and 110b have polarities opposite to each other so that the polarities of the faces shown in the drawings all have N poles, and the second pair of permanent magnets 110c and 110d have polarities opposite to each other such that the polarities of the faces shown in the drawings all have S poles. It can be arranged as. The magnetic flux and the current by the arc extinguishing permanent magnet 110 arranged as described above are determined to determine a path in which the arc moves.

According to the present embodiment, as shown in FIG. 4, the force of F1 and the force of F2, which occur when the load current I and the magnetic flux by the two pairs of arc-extinguishing permanent magnets 110 cross each other, always act in the same direction, causing The currents do not meet each other so that a short circuit does not occur between the electric arcs. Due to the structure of the opposite polarity arrangement of the arc extinguishing permanent magnet 110, the magnetic flux is maintained in the same direction, so that the direction of movement of the electric arc changes when the direction of the load current I is changed, but the direction of movement of the arc at each contact point. By keeping these in the same direction, no problem arises in the arc extinguishing function.

In addition, this configuration causes the arc current to change when the direction of the current is changed, and further simplifies and miniaturizes the bidirectional switch contact device by arranging the arc arc permanent magnet to cut off the bidirectional current in the DC switch device. Can be.

As described above, in the bidirectional switch contact device according to the exemplary embodiment of the present invention, the arc arc permanent magnet 110 is disposed in the forward direction on the outside of the contact airtight box of the ceramic chamber 100 and the reverse direction on the other side, so that the arc direction is the same. Can be directed in a direction. In addition, the high temperature due to the arc without any insulation other than the insulating cover for insulating the fixed contact 109 in the upper layer toward the fixed contact 109 around the movable contact 107 inside the contact airtight box of the ceramic chamber 100. Eliminates elements of dielectric breakdown due to breakdown of insulation or ignition of insulation due to arcs, obstructs arc extinguishment caused by other materials in the area where the arc is induced, eliminates the re-ignition of sparks in the arc, It is possible to secure a quick arc space of direction and arc.

5 is a view for explaining the shape of the arc arc permanent magnet according to an embodiment of the present invention.

Since the arc arc permanent magnets 110 are arranged one by one on the left and right sides of the fixed contact 108 and the other is arranged in the opposite polarity, the arc arc permanent magnets 110 are not separated from the outside. In order to prevent the leakage of the magnetic force of the permanent magnet closed circuit holder (111, see Fig. 6) can be adsorbed and fixed. At this time, each of the arc arc permanent magnets 110 may include a groove on at least one surface for fixing with the permanent magnet holder 111, the fitting portion or the protrusion portion in the bobbin 115 (see Fig. 6) of the excitation coil 101. By forming the polarity of the arc arc permanent magnet 110 can be fixedly arranged. For example, as shown in FIG. 5, a groove is formed at one side of the bottom surface of the arc extinguishing permanent magnet 110 to be fitted to the fitting portion of the bobbin 115 to accurately assemble the polarity to serve as a fixing part.

6 is a view for explaining the coupling relationship of the detailed components of the bidirectional switch contact device according to an embodiment of the present invention.

According to the present invention, as shown in FIG. 6, a metal cup is formed on the lower side of the ceramic chamber 100 through which the ceramic chamber 100 into which the airtight contact mechanism part can be placed and the metal layer on the ceramic is fixed to the airtight joint 108, and the lower side of the ceramic chamber 100. Hermetically weld welds 114 to the hermetic seal, insert the fixed contact 108 into the fixed contact insulator 116, insert the movable contact assembly and arc base 113, and seal the yoke plate 105 shield cup 114 to airtight. The contact device can be manufactured by welding. The coupling structure of the fixed contact 108 and the fixed contact insulator 116 will be described later with reference to FIG. 7.

The yoke 104 of the metal material, the fixed iron core 103 constituting the magnetic circuit, the exciting coil 101, the movable iron core 102, the yoke plate 105, the movable shaft 106, the movable contact 107, fixed Contact 108, contact spring 109, arc arc permanent magnet 110, excitation coil 101, return spring 112, insulated arc base 113, shield cup 114, bobbin 115, permanent Magnet holder 111 or the like.

Here, the arc extinguishing permanent magnet 110 and the permanent magnet holder 111 may be fixed by being fitted to the fitting portion of the bobbin 115 by a groove formed in at least one surface, for example, the bottom surface.

The fixed iron core 103 is positioned on the yoke plate 105, the movable iron core 102 is positioned on the same axis as the fixed iron core 103, and the yoke plate 105 is positioned at the upper end thereof. An insulating arc base 113 for insulation is disposed above the yoke plate 105.

The arc extinguishing permanent magnets 110 are arranged one by one on both sides of the fixed contact 108 and the other is arranged in pairs opposite in polarity. The arc arc permanent magnet 110 may be fixed by the permanent magnet holder 111 for the permanent magnet closed circuit in order to prevent the arc arc permanent magnet 110 from being detached and preventing leakage of magnetic force to the outside. The permanent magnet holder 111 is configurable as a pair as shown, and includes a first permanent magnet holder for holding the first pair of permanent magnets and a second permanent magnet for fixing the second pair of permanent magnets. Wherein the first pair of permanent magnets and the second pair of permanent magnets are arranged in opposite polarities to each other to have opposite polarities.

Referring to the switch operation, when a current flows in the exciting coil 101, a magnetic force is formed in the yoke 104, which moves the movable movable core 102 to the fixed iron core 103, and the yoke plate 105 and the yoke A closed circuit is constructed around the movable iron core 102 and the fixed iron core 103, and the movable shaft 106 mechanically connected to the movable iron core 102 moves through the bushing 119, and The pressure spring 109 for contact pressure may be fitted to the protrusion of the pressure spring base 118 made of an insulator on the top. Next, the movable contact 107 is positioned on the contact spring 109 and the projection at the center of the movable contact 107 is fitted to the contact spring 109 made in a circular shape, and is received by the bottom of the movable contact holder 117. As the movable iron core 102 moves, the movable contact 107 comes into contact with the fixed contact 108.

On the contrary, when the applied current is turned off to the exciting coil 101, all of them are demagnetized, and the movable iron core 102 is driven by the restoring force of the return spring 112 between the movable iron core 102 and the fixed iron core 103. It is dropped from the fixed iron core 103 and the movable contact 107 is separated from the fixed contact 108.

As described above, when the load current is flowing through the fixed contact 108 and the movable contact 107, the movable contact 107 and the fixed contact 108 are separated if the movable contact 107 is separated from the fixed contact 108. An electrical arc occurs in between, and the arc may be arc extinguished in the same direction by an arc extinguishing permanent magnet 110 disposed outside the ceramic chamber 115.

In addition, the upper end of the bidirectional switch contact device may be sealed with a ceramic, and sealing may be formed through welding with the airtight yoke plate 105.

7 is a view for explaining a coupling structure of the fixed contact 108 and the fixed contact insulator 116 according to an embodiment of the present invention.

7A shows a cross-sectional view of the fixed contact 108 and the fixed contact insulator 116 prior to mating. The fixed contact 108 may include a recess 108a recessed in a portion below the center in the vertical length direction to form an edge. The lower portion of the recess 108a may include an inclined portion 108b having a gentle inclination so that the diameter thereof becomes smaller toward the downward direction. The fixed contact 108 is configured to be coupled to the fixed contact insulator 116 through a structure of the recess 108a and the inclined portion 108b.

The fixed contact insulator 116 is made of an insulating material, for example, may be made of a material such as teflon. In addition, the fixed contact insulator 116 may have a ring shape, and the fixed contact 108 may be inserted into and coupled to the fixed contact insulator 116, thereby having a structure for stably fixing the fixed contact 108. In particular, the fixed contact insulator 116 includes a protrusion 116a at the bottom thereof, so that the protrusions (not shown) are formed in the recess 108a of the fixed contact 108 after all the inclined portions 108b of the fixed contact 108 are inserted. The 116a is fitted to allow the fixed contact 108 to be fixed to the fixed contact insulator 116a.

FIG. 7B is a view illustrating the fixed contact 108 coupled to the fixed contact insulator 116 in an interference fit manner. As shown in FIG. 7B, the recess 108a of the fixed contact 108 is fitted into the protrusion 116a of the fixed contact insulator 116, whereby the fixed contact 108 and the fixed contact insulator 116 are stably coupled. Can be fixed.

Embodiments disclosed in the specification of the present invention are merely examples, and the present invention is not limited thereto. The scope of the present invention should be construed by the claims below, and all techniques within the scope equivalent thereto will be construed as being included in the scope of the present invention.

100: ceramic chamber 101: excitation coil
102: movable iron core 103: fixed iron core
104: yoke 105: yoke plate
106: movable shaft 107: movable contact
108: fixed contact 109: contact spring
110: arc lo permanent magnet 111: permanent magnet holder
112: return spring 113: arc base
114: shield cup 115: coil bobbin
116: fixed contact insulator 117: movable contact holder
118: pressure spring base 119: bushing

Claims (8)

In a direct current bidirectional contact device having an arc extinguishing function of a direct current power source,
A pair of fixed contacts including a first fixed contact and a second fixed contact for applying a DC power source;
A movable contact moveable to be in contact with the pair of fixed contacts;
Two pairs of permanent magnets disposed outside said pair of fixed contacts for arc extinguishing;
A ceramic chamber configured to have a space in which the fixed contact point and the movable contact point can be disposed; And
Fixed contact insulator which can be combined with the fixed contact
Including,
The fixed contact insulator is in the form of a ring and consists of an insulating material,
The fixed contact may include a concave portion recessed to form an edge, and an inclined portion having an inclination such that a diameter thereof becomes smaller toward the bottom of the concave portion, and the fixed contact insulator may be fitted with the concave portion of the fixed contact. DC bidirectional contact device comprising a projection.
The method of claim 1, wherein the two pairs of permanent magnets are disposed between the movable contact and the fixed contact so that the direction of magnetic flux by the two pairs of permanent magnets is perpendicular to the direction of the arc current when the arc is generated. The pair of permanent magnets are all disposed outside the ceramic chamber around the pair of fixed contacts, direct current bidirectional contact device.
The method of claim 1, wherein the two pairs of permanent magnets are each arranged side by side in a direction parallel to the longitudinal direction of the movable contact,
A first pair of permanent magnets of the two pairs of permanent magnets is disposed opposite to both sides with respect to the first fixed contact, and a second pair of permanent magnets of the two pairs of permanent magnets is configured to DC bidirectional contact device that is disposed opposite to both sides in the center.
4. The direct current bidirectional contact device as claimed in claim 3, wherein the first pair of permanent magnets and the second pair of permanent magnets are arranged to have opposite polarities to each other.
4. The apparatus of claim 3, further comprising a pair of permanent magnet holders for securing each pair of permanent magnets of the two pairs of permanent magnets and for preventing magnetic leakage to the outside.
And the pair of permanent magnet holders include a first permanent magnet holder for fixing the first pair of permanent magnets and a second permanent magnet for fixing the second pair of permanent magnets.
The direct current bidirectional contact device as set forth in claim 5, wherein each of the two pairs of permanent magnets includes a groove on at least one surface to secure the fitting portion of the bobbin together with the permanent magnet holder.
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