WO2014087574A1 - Contact device and electromagnetic switch using same - Google Patents

Abstract

Provided are a contact device, which can easily extinguish an arc generated between stationary contacts and a movable contact during opening, and an electromagnetic switch using the same. The contact device is provided with a pair of stationary contacts (111, 112) fixedly disposed with a prescribed gap within an arc extinguishing chamber (102) and a movable contact (130) disposed so as to be able to contact and separate from the pair of stationary contacts within the arc extinguishing chamber. A conductive arc current reversing plate part (133), which reverses, from the movable contact, the current of the foot of an arc generated during opening that creates separation from the pair of stationary contacts, is formed in a position where the movable contact faces the pair of stationary contacts.

Description

Contact device and electromagnetic switch using the same

The present invention relates to a contact device having a pair of fixed contacts arranged at a predetermined interval and a movable contact arranged so as to be able to come into contact with and away from the fixed contacts, and an electromagnetic switch using the contact device.

As a contact device that opens and closes a current path, in an electromagnetic switch such as an electromagnetic relay or an electromagnetic contactor, the current is cut off from a closed state of a contact mechanism in which a stationary contact and a movable contact are in contact with each other. Various contact mechanisms have been proposed that extinguish arcs that are generated at the time of opening to move the movable contact away from the fixed contact in order to achieve a state.
For example, a pair of fixed contacts each having a fixed contact disposed at a predetermined distance away from each other, and a movable contact having a movable contact at left and right ends disposed so as to be able to contact with and separate from the pair of fixed contacts An electromagnetic switching device comprising an electromagnet device for driving the movable contact and an enclosing member for housing the movable contact and the stationary contact, and an arc extinguishing permanent magnet arranged in parallel to the moveable contact on the outside of the enclosing member An apparatus has been proposed (see, for example, Patent Document 1).

JP 2006-19148 A

However, in the conventional example described in Patent Document 1, it is easy to extinguish the arc by stretching the arc by the magnetic force of the permanent magnet, but it is possible to move the movable contact from the input state in which the movable contact is in contact with the fixed contact. The legs of the arc generated at the time of current interruption for separating the child, that is, at the time of opening, move the movable contact of the movable contact to the arc extinguishing space side by the magnetic force of the permanent magnet. There is an unsolved problem that the moved arc leg stays at the corner of the movable contact and the movable contact is consumed by the metal vapor generated from the arc leg.
Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and suppresses the consumption of the movable contact due to the arc generated between the fixed contact and the movable contact at the time of opening. It is an object of the present invention to provide a contact device that can be used and an electromagnetic switch using the contact device.

In order to achieve the above object, a first aspect of the contact device according to the present invention includes a pair of fixed contacts fixedly arranged in the arc extinguishing chamber at a predetermined interval, and the pair of fixed contacts in the arc extinguishing chamber. And a movable contact arranged so as to be able to contact and separate from the contact. Then, a conductive arc rotation that commutates one of the movable contact and the pair of fixed contacts with a leg of an arc generated when the movable contact is separated from the pair of fixed contacts. A flow plate portion is formed.
According to the first aspect, the movable contact is a pair of fixed contacts in the conductive arc commutation plate portion formed at a position facing one of the movable contact and the pair of fixed contacts. The foot of the arc generated when moving away from the movable contact can be commutated from the movable contact to the arc commutation plate portion, and the wear on the side where the arc commutation portion of the movable contact and the pair of fixed contacts is provided is suppressed. can do.

In a second aspect of the contact device according to the present invention, the arc commutation plate portion is formed of a metal plate having a melting temperature higher than that of the movable contact.
According to this second aspect, since the melting temperature of the arc commutation plate portion is higher than the melting temperature of the movable contact, the arc commutation is performed by causing the arc foot to commutate to the arc commutation plate portion. It is possible to suppress the consumption of the movable contact by subscribing at the plate portion.

Further, according to a third aspect of the contact device of the present invention, the arc commutation portion contacts the opposite side of the pair of fixed contacts of the movable contact and faces the pair of fixed contacts. A mounting plate portion having a bending extension portion that bends and extends in a direction away from the pair of fixed contacts, and a pair of contact plates extending from the bending extension portion of the mounting plate portion in contact with the side edge of the movable contact member. It is comprised by the arc commutation side board part.
According to the third aspect, the arc commutation plate can be easily attached to the movable contact by attaching the attachment plate to the surface of the movable contact opposite to the pair of fixed contacts. Moreover, since the side surface of the movable contact is covered by the pair of arc commutation side plates, the consumption of the movable contact can be further reduced.

According to a fourth aspect of the contact device of the present invention, the arc commutation plate portion contacts the surface of the movable contact opposite to the pair of fixed contacts, the attachment plate portion It is comprised with a pair of arc commutation side board part extended in the direction away from a pair of said stationary contact formed in the both-sides edge of the position facing the said pair of stationary contact of a board part.
According to the fourth aspect, the arc commutation plate portion has the pair of arc commutation side plates extending from the movable contact to the opposite side of the pair of fixed contacts. The legs of the arc can be commutated in a direction away from the movable contact.

According to a fifth aspect of the contact device of the present invention, the pair of fixed contacts are formed in a C shape from an upper plate portion, an intermediate plate portion, and a lower plate portion, and the movable contact member is the upper contact portion. An arc commutation plate portion is disposed between the plate portion and the lower plate portion so as to be able to contact with and separate from the lower plate portion, and on the surface opposite to the movable contact of the lower plate portion of the pair of fixed contacts. Is provided.
According to the fifth aspect, since the arc commutation plate portion is formed on the opposite side of the movable contact of the pair of fixed contacts, the arc legs can be moved from the pair of fixed contacts by the arc commutation plate portion. It can be commutated in the direction away from the contact.

A first aspect of the electromagnetic switching device according to the present invention includes the contact device according to the first to fifth aspects described above, wherein the movable contact is connected to a movable iron core of an electromagnet device, and the pair The fixed contact is connected to the external connection terminal.
According to this configuration, it is possible to provide a contact device that can reliably extinguish an arc generated at the time of opening with a simple configuration and improve the breaking performance, and an electromagnetic switch using the contact device.

According to the present invention, when an arc is generated between the movable contact and the pair of fixed contacts when the movable contact is separated from the pair of fixed contacts, one of the movable contact and the pair of fixed contacts is detected. The side of the arc on the side can be quickly commutated to the arc commutation plate portion, and consumption of one of the movable contact and the pair of fixed contacts can be suppressed. For this reason, the lifetime of the movable contact can be extended.
In addition, by applying a contact device having the above effects to an electromagnetic switch, an electromagnetic contactor, an electromagnetic relay, etc. that can extend the life by suppressing the consumption of the movable contact due to an arc generated at the time of opening with a simple configuration. An electromagnetic switch can be provided.

It is sectional drawing which shows 1st Embodiment at the time of applying this invention to an electromagnetic contactor. It is a perspective view which shows the arc commutation board part in 1st Embodiment. It is sectional drawing which shows the arc expansion | extension condition by the arc commutation board part in 1st Embodiment. It is sectional drawing which shows 2nd Embodiment at the time of applying this invention to an electromagnetic contactor. It is a perspective view which shows the arc commutation board part in 2nd Embodiment. It is sectional drawing which shows the arc expansion | extension condition by the arc commutation board part in 2nd Embodiment. It is sectional drawing which shows 3rd Embodiment at the time of applying this invention to an electromagnetic contactor. It is sectional drawing which shows the arc expansion | extension condition by the arc commutation board part in 3rd Embodiment. It is a perspective view which shows the arc commutation board part in 3rd Embodiment. It is a perspective view of the arc commutation board part which shows the modification of 3rd Embodiment. It is a perspective view of the arc commutation board part which shows the other modification of 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a first embodiment when the contact device according to the present invention is applied to an electromagnetic contactor, and FIG. 2 is an exploded perspective view of a contact housing case. 1 and 2, reference numeral 10 denotes an electromagnetic contactor. The electromagnetic contactor 10 includes a contact device 100 having a contact mechanism and an electromagnet unit 200 that drives the contact device 100.
As is apparent from FIGS. 1 and 2, the contact device 100 includes a contact storage case 102 as an arc extinguishing chamber that stores the contact mechanism 101. The contact housing case 102 includes a hook-like body 103 having an insulating property and having an open lower end, and a metal rectangular cylinder 104 joined to the lower end surface of the hook-like body 103. The metal square cylinder 104 has its flange portion 105 sealed and fixed to an upper magnetic yoke 210 of an electromagnet unit 200 described later.

Further, the top plate 103a of the bowl-shaped body 103 is formed with through holes 106 and 107 through which a pair of fixed contacts 111 and 112, which will be described later, are inserted at predetermined intervals at the center.
As shown in FIG. 1, the contact mechanism 101 includes a pair of fixed contacts 111 and 112 that are inserted into and fixed to the through holes 106 and 107 of the top plate 103 a of the contact storage case 102. Each of the fixed contacts 111 and 112 includes a contact support conductor 114 having a flange portion 113 protruding outward at the upper end inserted through the through holes 106 and 107 of the top plate 103a, and the contact support conductor 114. And a contact conductor portion 116 which is connected to the bottom surface of the top plate 103a and has a flat contact portion 115 formed at the inner end thereof.

A movable contact 130 made of copper, for example, is disposed so as to face the contact conductor 116 of the fixed contacts 111 and 112 from below. The movable contact 130 is supported by a connecting shaft 131 fixed to a movable iron core 212 of an electromagnet unit 200 described later. As shown in FIG. 1, the movable contact 130 is formed with a through hole 132 through which the connecting shaft 131 is inserted at the center.
The connecting shaft 131 has a fixed ring 131b that is prevented from coming off by a retaining ring 131a made of a C ring or an E ring that protrudes outward at the upper end, and a movable contact 130 is disposed below the fixed ring 131b.

An arc commutation plate portion 133 is disposed on the lower end surface of the movable contact 130 opposite to the pair of fixed contacts 111 and 112. The arc commutation plate portion 133 is formed of a conductive metal material having a melting temperature higher than that of the movable contact 130, such as iron or stainless steel.
As shown in FIG. 2, the arc commutation plate portion 133 has a mounting plate portion 134 that contacts the lower surface of the movable contact 130 opposite to the pair of fixed contacts 111 and 112. The attachment plate portion 134 includes a central plate portion 135 in which a through hole 135a through which the connecting shaft 131 is inserted is formed in the central portion, and a bent portion 136a that is bent downward and formed at both left and right end portions of the central plate portion 135. , 136b and extension portions 137a, 137b extending outward from the lower ends of the bent portions 136a, 136b in parallel to the central plate portion 135. A pair of arc commutation side plate portions 138 a and 138 b that extend upward on the front and rear side surfaces of the extension portions 137 a and 137 b at both left and right ends and fit on both front and rear side surfaces of the movable contact 130 are integrally formed.

Then, the arc commutation plate portion 133 is attached to the movable contact 130. The arc commutation plate portion 133 is attached by bringing the attachment plate portion 134 into contact with the lower surface of the movable contact 130 opposite to the pair of fixed contacts 111 and 112 and attaching to the through hole 132 of the movable contact 130. This is performed by matching the through holes 135a of the plate portion 134 and fitting the arc commutation side plate portions 138a and 138b to the front and rear side surfaces of the movable contact 130.

Thereafter, the movable contact 130 and the arc commutation plate are disposed in a state in which the contact spring 139 wound around the connecting shaft 131 is disposed on the flange portion 133c formed below the fixed ring 133b of the connecting shaft 131 by a predetermined distance. After the connecting shaft 131 is inserted into the through holes 132 and 135a of the part 133, the fixing ring 133b is fixed by the retaining ring 131a. As a result, the movable contact 130 and the arc commutation plate portion 133 are arranged on the connecting shaft 131 while being pressed against the fixed ring 133b by the contact spring 139.
In the released state, the movable contact 130 is in a state in which the contact portions 130a at both ends and the flat contact portions 115 on the lower plate portion of the contact conductor portions 116 of the fixed contacts 111 and 112 are spaced apart from each other with a predetermined interval. . Further, the movable contact 130 is configured such that the contact portions at both ends are in contact with the flat contact portion 115 at the lower end of the contact conductor portion 116 of the fixed contacts 111 and 112 with a predetermined contact pressure by the contact spring 139 at the closing position. Is set to

Further, as shown in FIG. 3, a pair of movable contacts 130 is formed on the outer peripheral surface facing the opposed portions of the stationary contacts 111, 112 and the movable contacts 130 of the bowl-shaped body 103 of the contact storage case 102 from the front-rear direction. A pair of arc extinguishing permanent magnets 142 and 143 are provided for extending an arc generated when the fixed contacts 111 and 112 are separated from each other.
The pair of arc extinguishing permanent magnets 143 and 144 are magnetized so that their opposing magnetic pole surfaces have the same pole, for example, N pole, in the thickness direction. Further, arc extinguishing spaces 145 and 146 are formed on both outer sides in the front-rear direction of the opposed positions of the pair of fixed contacts 111 and 112 and the movable contact 130 of the bowl 103 as shown in FIG. .
Therefore, the arc 150 generated when the movable contact 130 is separated from the pair of fixed contacts 111 and 112 is arc extinguished by the magnetic flux from the arc extinguishing permanent magnets 143 and 144 as shown in FIG. Is stretched to the arc extinguishing space 145 side on the permanent magnet 143 side.

At this time, in the movable contact 130, the arc commutation side plate portions 138a and 138b of the arc commutation plate portion 133 are fitted to the front and rear end portions of the position facing the pair of fixed contacts 111 and 112. Immediately after the contact 130 is separated from the pair of fixed contacts 111, 112, the legs of the arc are located at the exposed corners 130 b of the front and rear ends of the movable contact 130.
However, at the next moment, the arc commutation plate 133 is commutated to the upper side of the arc commutation side plate portion 138a, and the arc commutation is performed as the legs of the arc 150 are extended by the magnetic flux of the arc extinguishing permanent magnets 143 and 144. It moves to the lower end side of the flow side plate portions 138a and 138b, and finally reaches the connecting portion between the arc commutation side plate portions 138a and 138b and the extension portions 137a and 137b as shown in FIG.

As shown in FIG. 1, the electromagnet unit 200 has a U-shaped magnetic yoke 201 as viewed from the side, and a cylindrical auxiliary yoke 203 is fixed to the center of the bottom plate portion 202 of the magnetic yoke 201. A spool 204 is disposed outside the cylindrical auxiliary yoke 203.
The spool 204 includes a central cylindrical portion 205 that passes through the cylindrical auxiliary yoke 203, a lower flange portion 206 that protrudes radially outward from the lower end portion of the central cylindrical portion 205, and a little more than the upper end of the central cylindrical portion 205. The upper flange portion 207 protrudes radially outward from the lower side. An exciting coil 208 is wound around a storage space formed by the central cylindrical portion 205, the lower flange portion 206, and the upper flange portion 207.

The upper magnetic yoke 210 is fixed between the upper ends of the magnetic yoke 201 serving as the open end. The upper magnetic yoke 210 is formed with a through hole 210a for fitting and supporting the fixed iron core 211 at the center.
A fixed iron core 211 is disposed on the upper side of the central cylindrical portion 205 of the spool 204. A movable iron core 212 is arranged at a predetermined distance away from the lower side of the fixed iron core 211 that faces the fixed iron core 211, and a return spring 214 is disposed between the movable iron core 212 and the fixed iron core 211. A connecting shaft 131 that supports the movable contact 130 is fixed to the movable core 212.

The fixed iron core 211 and the movable iron core 212 are covered with a cap 230 made of a non-magnetic material and formed into a bottomed cylindrical shape, and a flange portion 231 formed by extending outward in the radial direction at the open end of the cap 230. Is sealed to the lower surface of the upper magnetic yoke 210. As a result, the contact housing case 102 and the cap 230 form a sealed container in which the contact mechanism 101, the fixed iron core 211, and the movable iron core 212 are arranged in a sealed space. Then, a gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, SF ₆ , and He is sealed in a sealed container formed by the contact housing case 102 and the cap 230.

Next, the operation of the above embodiment will be described.
Now, it is assumed that the fixed contact 111 is connected to a power supply source that supplies a large current, for example, and the fixed contact 112 is connected to a load.
In this state, it is assumed that the exciting coil 208 in the electromagnet unit 200 is in a non-excited state and the electromagnet unit 200 is in a released state in which no exciting force for lowering the movable core 212 is generated. In this released state, the movable iron core 212 is urged by the return spring 214 in a direction away from the fixed iron core 211.
For this reason, the contact part 130a of the movable contact 130 of the contact mechanism 101 connected to the movable iron core 212 via the connecting shaft 131 is spaced downward from the flat contact part 115 of the fixed contacts 111 and 112 by a predetermined distance. ing. For this reason, the current path between the stationary contacts 111 and 112 is in a disconnected state, and the contact mechanism 101 is in an open state.

In order to supply electric power to the load from this released state, the exciting coil 208 of the electromagnet unit 200 is excited, an exciting force is generated by the electromagnet unit 200, and the movable iron core 212 is attracted by the fixed iron core 211. The iron core 212 is raised against the urging force of the return spring 214. The rising of the movable core 212 is stopped when the upper surface of the movable core 212 contacts the lower surface of the fixed core 211.
As described above, when the movable iron core 212 is raised, the movable contact 130 connected to the movable iron core 212 via the connecting shaft 131 is also raised, and the contact portion 130a is a flat contact of the fixed contacts 111 and 112. The part 115 is brought into contact with the contact pressure of the contact spring 139.
For this reason, a closed state is reached in which a large current of the external power supply source is supplied to the load through the fixed contact 111, the movable contact 130, and the fixed contact 112.

When the current supply to the load is cut off from the closed state of the contact mechanism 101, the excitation of the excitation coil 208 of the electromagnet unit 200 is stopped.
As a result, the exciting force that moves the movable iron core 212 upward by the electromagnet unit 200 disappears, and the movable iron core 212 is lowered by the urging force of the return spring 214.
When the movable iron core 212 is lowered, the movable contact 130 connected via the connecting shaft 131 is lowered. In response to this, the movable contact 130 is in contact with the stationary contacts 111 and 112 while the contact pressure is applied by the contact spring 139. Thereafter, when the contact pressure of the contact spring 139 disappears, the movable contact 130 is in an open state in which it is separated downward from the fixed contacts 111 and 112.

In this open state, an arc is generated between the flat contact portion 115 of the fixed contacts 111 and 112 and the contact portion 130a of the movable contact 130, and the current conduction state is continued by this arc.
At this time, since the opposing magnetic pole surfaces of the arc extinguishing permanent magnets 143 and 144 are N poles and the outside thereof is the S pole, the magnetic flux emitted from the N poles is permanent for each arc extinguishing as seen from the plane. Magnets 143 and 144 The arc generating portion of the contact portion 115 of the fixed contact 111 and the contact portion 130a of the movable contact 130 crosses from the inside to the outside in the longitudinal direction of the movable contact 130 and reaches the S pole to reach the magnetic field. Is formed. Similarly, the arc generating portion of the contact portion 115 of the fixed contact 112 and the contact portion 130a of the movable contact 130 crosses from the inside to the outside in the longitudinal direction of the movable contact 130 and reaches the S pole to form a magnetic field. .

Accordingly, the magnetic fluxes of the arc extinguishing permanent magnets 143 and 144 are both between the contact portion 115 of the fixed contact 111 and the contact portion 130a of the movable contact 130, and between the contact portion 115 of the fixed contact 112 and the contact of the movable contact 130. The portions 130a cross in the opposite directions in the longitudinal direction of the movable contact 130.
For this reason, between the contact part 115 of the fixed contactor 111 and the contact part 130a which becomes the contact part of the movable contactor 130, current flows from the fixed contactor 111 side to the movable contactor 130 side and the direction of the magnetic flux Φ. Is the direction from the inside to the outside. For this reason, according to Fleming's left-hand rule, the arc-extinguishing space 145 is directed to the arc extinguishing space 145 side perpendicular to the longitudinal direction of the movable contact 130 and perpendicular to the opening / closing direction of the contact portion 115 of the fixed contact 111 and the movable contact 130. A large Lorentz force acts.

Due to this Lorentz force, an arc generated between the contact portion 115 of the fixed contact 111 and the contact portion 130a of the movable contact 130 passes through the arc extinguishing space 145 from the side surface of the contact portion 115 of the fixed contact 111. Thus, it is greatly stretched to reach the upper surface side of the movable contact 130 and extinguished.
At this time, the arc is stretched into the outer arc extinguishing space 145, so that in the movable contact 130, the arc foot quickly moves from the corner portion 130 b of the movable contact 130 to the arc commutation side plate of the arc commutation plate portion 133. The portion of the arc commutates to the portion 138a, and the legs of the arc sequentially move to the lower side of the arc commutation side plate portion 138a. Finally, as shown in FIG. 3, the arc 150 is greatly stretched along the inner wall surface of the arc extinguishing space 145.

Therefore, it takes a short time for the arc to stay on the movable contact 130, and the consumption of the movable contact 130 can be suppressed. In addition, the distance between the arcs of the stationary contact 111 and the movable contact 130 is greatly increased, and a reduction in electric field strength due to the influence of metal vapor generated by the arc between the stationary contact 111 and the movable contact 130 is prevented. The electric field strength between the arc legs can be maintained at or above the arc voltage. For this reason, it is possible to reliably prevent a re-occurring arc from occurring between the electrodes in the vicinity of the arc legs of the fixed contact 111 and the movable contact 130, and to improve the interruption performance.

On the other hand, when the electromagnetic contactor 10 is turned on and the positive and negative polarities of the currents flowing through the fixed contacts 111 and 112 are reversed and the release state is set, the movable contact 130 is moved from the fixed contact 112. Since the current flows through the stationary contact 111 side and the direction of the current is reversed, the Lorentz force acts on the arc extinguishing space 146 side, except that the arc is stretched to the arc extinguishing space 146 side. The same arc extinguishing function is exhibited.

As described above, according to the first embodiment, the contact portion 130a of the movable contact 130 is changed from the input state in which the contact portion 130a of the movable contact 130 is in contact with the contact portion 115 of the fixed contacts 111 and 112. An arc is generated between the contact part 130a of the movable contactor 130 and the contact part 115 of the fixed contactor 111 and 112 at the time of opening to separate the contactor 115 from the contact part 115 of the fixed contactor 111 and 112. This arc is stretched to the arc extinguishing space 145 or 146 by the magnetic force of the arc extinguishing permanent magnet 143 or 144.

At this time, the arc commutation side plate portions 138a and 138b of the arc commutation plate portion 133 are fitted to the movable contact 130 on the front and rear side surfaces facing the pair of fixed contacts 111 and 112, respectively. For this reason, after the arc is generated, the arc starts to be stretched to the arc extinguishing space 145 or 146, so that the arc foot on the movable contact 130 side immediately starts from the corner 130 b of the movable contact 130 to the arc commutation side plate 138 a. Alternatively, the commutation to 138b is performed, and then the arc foot moves downward on the arc commutation side plate portion 138a or 138b until the arc is extinguished.

Therefore, the arc foot does not come into contact with the movable contact 130, and the arc commutation plate portion 133 side deals with the damage caused by the arc and suppresses the consumption of the movable contact by the metal vapor generated from the arc foot. be able to. In addition, since the arc commutation plate portion 133 is made of a metal member such as iron or stainless steel having a melting temperature higher than that of the movable contact 130, it is possible to further suppress the amount of arc consumption compared to the movable contact 130. it can.
As a result, the life of the movable contact 130 can be extended, and the reliability of the electromagnetic contactor 10 can be improved.

In addition, in the said 1st Embodiment, although the case where the arc commutation board part 133 had the attachment board part 134 was demonstrated, it is not limited to this, The attachment board part 134 is abbreviate | omitted and arc commutation is carried out The side plate portions 138a and 138b and extension portions 137a and 137b that connect the lower portions of the side plate portions 138a and 137b are formed in a U-shaped cross section, and the center portions in the front-rear direction of the extension portions 137a and 137b A convex portion may be formed, and the convex portion may be fixed to the movable contact 130 by a fixing means such as a screw, brazing, or welding.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the shape of the arc commutation plate portion 133 is turned upside down.
That is, in the second embodiment, the arc commutation plate portion 133 described in the first embodiment is on the opposite side of the pair of fixed contacts 111 and 112 of the movable contact 130 as shown in FIG. An arc commutation side plate portion 302a extending downward to the front and rear end portions on the left and right end portions facing the pair of fixed contacts 111, 112 of the mounting plate portion 301, respectively, in contact with the lower surface. , 302b are provided. Here, the attachment plate portion 301 is formed with a through hole 301 a through which the connecting shaft 131 is inserted at the center.

Then, in the state where the arc commutation plate portion 133 having the above configuration makes the upper surface of the mounting plate portion 301 contact the lower surface of the movable contact 130 and the through hole 301a matches the through hole 132 of the movable contact 130. The connecting shaft 131 is mounted in the same manner as in the first embodiment.
In this way, the mounting plate 301 of the arc commutation plate 133 is brought into contact with the lower surface of the movable contact 130 and attached to the connecting shaft 131, and the movable contact 130 is paired with the pair of fixed contacts 111 as shown in FIG. , 112 are set to face each other.

In this state, as shown in FIG. 6, the arc commutation side plates 302 a and 302 b of the movable contact 130 are arranged on the front and rear side surfaces where the arc is generated at positions facing the pair of fixed contacts 111 and 112 of the movable contact 130. The pair of fixed contacts 111 and 112 protrude downward in the opposite direction from the front and rear ends.
Other configurations are the same as those of the first embodiment described above, and in FIGS. 4 to 6, the same reference numerals are given to the corresponding portions in FIGS. 1 to 3, and detailed description thereof is omitted. To do.
Therefore, in the second embodiment as well, as in the first embodiment described above, the contact point of the movable contact 130 when the movable contact 130 is set in a state of starting to open the electrode in which the movable contact 130 is separated from the fixed contacts 111 and 112 is set. An arc is generated between the portion 130a and the contact portion 115 of the pair of fixed contacts 111 and 112.

This arc foot is generated between the flat contact portion 130a of the movable contact 130 and the contact portion 115 of the pair of fixed contacts 111, 112. As the contact portions 130a and 115 are separated, the pair of fixed feet is formed. The contacts 111 and 112 and the movable contact 130 move outward in the width direction.
When the magnetic flux of the electromagnets 143 and 144 starts to be extended toward the arc extinguishing space 145 or 146, the arc foot of the movable contact 130 moves from the corner portion 130 b of the movable contact 130 down the front and rear side surfaces. Thereafter, commutation from the lower corner portion 130 c of the movable contact 130 to the arc commutation plate portion 133, and the arc foot moves down the arc commutation side plate portions 302 a and 302 b of the arc commutation plate portion 133, Eventually, the arc commutation side plate portions 302a and 302b reach the lower ends of the arc commutation side plates 302a and 302b, and the arc is greatly stretched along the inner wall of the arc extinguishing space 145 or 146 as shown in FIG.

Therefore, according to the second embodiment, when the arc is stretched, the legs of the arc are commutated from the movable contact 130 to the arc commutation plate portion 133, and consumption of the movable contact is suppressed. it can. As a result, the life of the movable contact 130 can be extended, and the reliability of the electromagnetic contactor 10 can be improved.
In the second embodiment as well, the central portion in the longitudinal direction of the attachment plate portion 301 of the arc commutation plate portion 133 is cut and removed to attach the left and right end attachment plate portions 301 and the arc commutation side plate portions 302a and 302b. And two arc commutation plate portions having an inverted U-shaped cross section are formed, and these arc commutation plate portions are individually separated from the pair of fixed contacts 111 and 112 of the movable contact 130 by screws, brazing You may make it fix by fixing means, such as attachment and welding. Even in this case, the same effect as the second embodiment can be obtained.

Further, in the second embodiment, as in the first embodiment described above, an arc that fits to the side surface of the movable contact 130 on the upper surface side corresponding to the arc commutation side plate portions 302a and 302b of the mounting plate portion 301. The commutation side plate portions 138a and 138b may be formed.
Moreover, in the said 1st and 2nd embodiment, although the case where the arc commutation board part was comprised separately from the movable contact 130 was demonstrated, it is not limited to this, An arc commutation side board The parts 138 a and 138 b may be formed integrally with the movable contact 130.

Moreover, in the said 1st and 2nd embodiment, although the case where the electromagnet unit 200 had the fixed iron core 211 and the movable iron core 212 was demonstrated, it is not limited to this, The fixed iron core 211 is abbreviate | omitted, and upper part A magnetic attraction part may be formed between the magnetic yoke 210 and the movable iron core 212.
Further, the electromagnet unit 200 is not limited to the above configuration, and any configuration can be adopted. In short, the movable contact 130 is driven so as to be able to contact with and separate from the pair of fixed contacts 111 and 112. If you can.
In the first and second embodiments, the case where the contact container 102 and the cap 230 constitute a sealed container and gas is sealed in the sealed container has been described. However, the present invention is not limited to this. Alternatively, gas sealing may be omitted when the current to be cut off is low.

Next, a third embodiment of the present invention will be described with reference to FIGS.
In the third embodiment, the arc commutation plate is attached to the fixed contact instead of attaching the arc commutation plate to the movable contact.
That is, in the third embodiment, the electromagnetic contactor 10 is configured as shown in FIG.
The electromagnetic contactor 10 includes a contact device 400 provided with a contact mechanism and an electromagnet unit 500 that drives the contact device 400.
As is apparent from FIGS. 7 and 8, the contact device 400 includes a contact storage case 402 as an arc extinguishing chamber that stores the contact mechanism 401. The contact housing case 402 is composed of a metal rectangular tube 404 having a flange 403 projecting outward at a metal lower end, and a flat ceramic insulating substrate closing the upper end of the metal rectangular tube 404. And a fixed contact supporting insulating substrate 405.
The metal rectangular tube 404 has its flange portion 403 fixed by being bonded to an upper magnetic yoke 510 of an electromagnet unit 500 described later.

Further, through holes 406 and 407 through which a pair of fixed contacts 411 and 412 (to be described later) are inserted in the center are formed in the fixed contact supporting insulating substrate 405 at a predetermined interval. A fixed contact supporting insulating substrate 405 is brazed to the upper surface of the rectangular tube 404.
As shown in FIG. 7, the contact mechanism 401 includes a pair of fixed contacts 411 and 412 that are inserted into and fixed to the through holes 406 and 407 of the fixed contact support insulating substrate 405 of the contact storage case 402. Each of the fixed contacts 411 and 412 includes a support conductor portion 414 having a flange portion 413 protruding outward at an upper end inserted into the through holes 406 and 407 of the fixed contact support insulating substrate 405, and the support conductor portion 414. And a C-shaped portion 415 that is disposed on the lower surface side of the fixed contact supporting insulating substrate 405 and has an inner side open.

The C-shaped portion 415 includes an upper plate portion 416 extending outward along the lower surface of the fixed contact supporting insulating substrate 405, an intermediate plate portion 417 extending downward from the outer end portion of the upper plate portion 416, and the intermediate plate A lower plate portion 418 extending inward from the lower end side of the portion 417 in parallel to the upper plate portion 416, that is, in a facing direction of the fixed contacts 411 and 412, is formed in a C shape.
Here, the support conductor part 414 and the C-shaped part 415 include a pin 414 a formed to protrude from the lower end surface of the support conductor part 414 in the through hole 420 formed in the upper plate part 416 of the C-shaped part 415. For example, it is fixed by brazing in the inserted state. The fixing of the support conductor portion 414 and the C-shaped portion 415 is not limited to brazing, but the pin 414a is fitted into the through hole 420, the male screw is formed on the pin 414a, and the female screw is formed on the through hole 420. The two may be screwed together.

Further, a C-shaped magnetic body plate 419 as viewed from above is mounted so as to cover the inner surface of the intermediate plate portion 417 in the C-shaped portion 415 of the fixed contacts 411 and 412. As described above, by arranging the magnetic plate 419 so as to cover the inner side surface of the intermediate plate portion 417, a magnetic field generated by the current flowing through the intermediate plate portion 417 can be shielded.
The magnetic plate 419 may be formed so as to cover the periphery of the intermediate plate 417 as long as it can shield the magnetic field caused by the current flowing through the intermediate plate 417.

Then, an insulating cover 421 made of a synthetic resin material that restricts the generation of an arc is attached to each of the C-shaped portions 415 of the fixed contacts 411 and 412.
As described above, by attaching the insulating cover 421 to the C-shaped portion 415 of the fixed contacts 411 and 412, only the upper surface side of the lower plate portion 418 is exposed on the inner peripheral surface of the C-shaped portion 415, and the contact is made. Part 418a.

And the movable contact 430 is arrange | positioned so that both ends may be arrange | positioned in the C-shaped part 415 of the stationary contacts 411 and 412. FIG. The movable contact 430 is supported by a connecting shaft 431 fixed to a movable plunger 515 of an electromagnet unit 500 described later. As shown in FIG. 7, the movable contact 430 has a recess 432 that protrudes downward in the vicinity of the connecting shaft 431 at the center, and a through-hole 433 through which the connecting shaft 431 is inserted is formed in the recess 432. Yes.
The connecting shaft 431 is formed with a flange portion 431a protruding outward at the upper end. The connecting shaft 431 is inserted into the contact spring 434 from the lower end side, and then inserted into the through hole 433 of the movable contact 430 so that the upper end of the contact spring 434 is brought into contact with the flange portion 431a. The movable contact 430 is positioned by, for example, a C ring 435 so as to obtain a force.

In the released state, the movable contact 430 is in a state in which the contact portions 430a at both ends and the contact portions 418a of the lower plate portion 418 of the C-shaped portions 415 of the fixed contacts 411 and 412 are spaced apart from each other. . Further, the movable contact 430 is in the closing position, and the contact portions 430a at both ends are applied to the contact portions 418a of the lower plate portion 418 of the C-shaped portions 415 of the fixed contacts 411 and 412 with a predetermined contact pressure by the contact spring 434. It is set to touch.

Further, arc extinguishing permanent magnets 443 and 444 for extending the arc to extinguish the arc as shown in FIG. 8 are arranged on the outer peripheral surface of the rectangular tube 404 of the contact housing case 402 in the front-rear direction.
Further, as shown in FIGS. 7 and 8, an insulating cylinder 440 formed of, for example, a synthetic resin material in a bottomed square cylinder shape is disposed on the inner peripheral surface of the rectangular cylinder 404 of the contact storage case 402. ing. In this insulating cylinder 440, arc extinguishing chambers 445 and 446 are formed at front and rear positions of the facing portions of the contact portions 418a of the fixed contacts 411 and 412 and the contact portions 418 of the movable contact 430, respectively.

Further, an arc commutation plate portion 450 is fixed to the lower plate portion 418 of the fixed contacts 411 and 412 on the lower surface side of the contact portion 418a facing the contact portion 430a of the movable contact 430. The arc commutation plate portion 450 is formed of a conductive metal material having a melting temperature higher than that of the pair of fixed contacts 411 and 412 such as iron or stainless steel.
As shown in FIGS. 8 and 9, the arc commutation plate portion 450 includes an upper plate portion 451 and front and rear side plates extending downward in parallel with the front and rear side surfaces of the lower plate portion 418 at the front and rear end portions of the upper plate portion 451. The portions 452 and 453 are formed in a substantially inverted U shape.

As shown in FIG. 7, the electromagnet unit 500 includes a U-shaped magnetic yoke 501 that is flat when viewed from the side, and a cylindrical auxiliary yoke 503 is fixed to the center of the bottom plate portion 502 of the magnetic yoke 501. Yes. A spool 504 is disposed outside the cylindrical auxiliary yoke 503.
The spool 504 includes a central cylindrical portion 505 that passes through the cylindrical auxiliary yoke 503, a lower flange portion 506 that protrudes radially outward from the lower end portion of the central cylindrical portion 505, and a radial direction from the upper end of the central cylindrical portion 505. The upper flange portion 507 protrudes outward. An exciting coil 508 is wound around a storage space formed by the central cylindrical portion 505, the lower flange portion 506, and the upper flange portion 507.

The upper magnetic yoke 510 is fixed between the upper ends of the magnetic yoke 501 that are the open ends. The upper magnetic yoke 510 is formed with a through hole 510 a facing the central cylindrical portion 505 of the spool 504 at the center.
In the central cylindrical portion 505 of the spool 504, a movable plunger 515 having a return spring 514 disposed between the bottom portion and the bottom plate portion 502 of the magnetic yoke 501 is slidably disposed. The movable plunger 515 is formed with a peripheral flange portion 516 that protrudes radially outward at an upper end portion that protrudes upward from the upper magnetic yoke 510.

Further, on the upper surface of the upper magnetic yoke 510, for example, a permanent magnet 520 formed in an annular shape having a center opening 521 having a square outer shape and a circular shape is fixed so as to surround the peripheral flange portion 516 of the movable plunger 515. The permanent magnet 520 is magnetized in the vertical direction, that is, in the thickness direction so that the upper end side is, for example, an N pole and the lower end side is an S pole. In addition, the shape of the central opening 521 of the permanent magnet 520 can be a shape that matches the shape of the peripheral flange 516, and the shape of the outer peripheral surface can be any shape such as a circle or a rectangle.

An auxiliary yoke 525 having a through hole 524 having the same outer shape as the permanent magnet 520 and having an inner diameter smaller than the outer diameter of the peripheral flange 516 of the movable plunger 515 is fixed to the upper end surface of the permanent magnet 520. The peripheral flange 516 of the movable plunger 515 is in contact with the lower surface of the auxiliary yoke 525.
A connecting shaft 431 that supports the movable contact 430 is screwed to the upper end surface of the movable plunger 515.

The movable plunger 515 is covered with a cap 530 made of a non-magnetic material and having a bottomed cylindrical shape, and a flange portion 531 formed by extending outward in the radial direction at the open end of the cap 530 is an upper magnetic yoke. The lower surface of 510 is sealed and joined. Thus, a sealed container is formed in which the arc extinguishing chamber 402 and the cap 530 are communicated with each other via the through hole 510a of the upper magnetic yoke 510. A sealed container formed by the arc extinguishing chamber 402 and the cap 530 is filled with a gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF ₆ .

According to the third embodiment, the movable plunger 515 is biased upward by the return spring 514 when the exciting coil 508 of the electromagnet unit 500 is in a non-energized state. For this reason, as shown in FIG. 7, the peripheral flange portion 516 of the movable plunger 515 is in contact with the lower surface of the auxiliary yoke 525, and the movable contact 430 is spaced upward from the lower plate portions 418 of the fixed contacts 411 and 412. is doing. For this reason, the current path between the stationary contacts 411 and 412 is in a disconnected state, and the contact mechanism 401 is in an open state.

In this way, in the released state of the electromagnet unit 500, both the urging force by the return spring 514 and the attraction force by the annular permanent magnet 520 are acting on the movable plunger 515, so that the movable plunger 515 is subjected to external vibration and impact. Therefore, it is possible to prevent the malfunction without fail.
When the exciting coil 508 of the electromagnet unit 500 is excited from this released state, an exciting force is generated by the electromagnet unit 500 and the movable plunger 515 is resisted against the biasing force of the return spring 514 and the attractive force of the annular permanent magnet 520. Press down.

The movable plunger 515 quickly descends against the urging force of the return spring 514 and the attractive force of the annular permanent magnet 520. Thereby, the lowering of the movable plunger 515 is stopped when the lower surface of the peripheral flange portion 516 comes into contact with the upper surface of the upper magnetic yoke 510.
As described above, when the movable plunger 515 is lowered, the movable contact 430 connected to the movable plunger 515 via the connection shaft 431 is also lowered, and the contact portion 430a is a contact portion 418a of the fixed contacts 411 and 412. In contact with the contact pressure of the contact spring 434.
Therefore, a closed state is reached in which a large current from the external power supply source is supplied to the load through the fixed contact 411, the movable contact 430, and the fixed contact 412.

When the current supply to the load is cut off from the closed state of the contact mechanism 401, the excitation of the excitation coil 508 of the electromagnet unit 500 is stopped.
As a result, the exciting force that moves the movable plunger 515 downward in the electromagnet unit 500 is eliminated, so that the movable plunger 515 is raised by the urging force of the return spring 514 and the peripheral permanent magnet 516 approaches the auxiliary yoke 525 as an annular permanent magnet. The suction force of 520 increases.

When the movable plunger 515 is raised, the movable contact 430 connected through the connecting shaft 431 is raised. In response to this, the movable contact 430 is in contact with the fixed contacts 411 and 412 while the contact pressure is applied by the contact spring 434. Thereafter, when the contact pressure of the contact spring 434 disappears, the movable contact 430 is in an open state in which it is separated upward from the fixed contacts 411 and 412.

In this open state, an arc is generated between the contact part 418a of the fixed contacts 411 and 412 and the contact part 430a of the movable contact 430, and the current conduction state is continued by this arc. At this time, since the insulating cover 421 covering the upper plate portion 416 and the intermediate plate portion 417 of the C-shaped portion 415 of the fixed contacts 411 and 412 is mounted, the arc is connected to the contact portions 418a of the fixed contacts 411 and 412. It can be generated only between the contact part 430a of the movable contact 430. For this reason, it is possible to reliably prevent the arc from moving on the C-shaped portion 415 of the stationary contacts 411 and 412, stabilize the arc generation state, and improve the arc extinguishing performance. In addition, since both side surfaces of the stationary contacts 411 and 412 are also covered with the insulating cover 421, it is possible to reliably prevent the arc tip from being short-circuited.

Further, since the upper plate portion 416 and the intermediate plate portion 417 of the C-shaped portion 415 are covered with the insulating cover 421, both end portions of the movable contact 430 and the upper plate portion 416 and the intermediate plate portion of the C-shaped portion 415 are covered. An insulating distance can be secured by the insulating cover 421 between 417, and the height of the movable contact 430 in the movable direction can be shortened. Therefore, the contact device 400 can be reduced in size.

Also, the leg of the arc generated between the contact part 418a of the fixed contacts 411 and 412 and the contact part 430a of the movable contact 430 is stretched by the arc extinguishing permanent magnet 444 as shown in FIG. For this reason, it commutates to the upper end side along the side surface on the movable contact 430 side. On the other hand, in the lower plate portion 418 of the fixed contacts 411 and 412, as shown in FIG. 8, the arc foot commutates downward along the side surface, and travels along the side plate portion 453 of the arc commutation plate portion 450 to the lower end. Reach.

As a result, the arc foot does not come into contact with the fixed contacts 411 and 412, and arc damage is contracted on the arc commutation plate 450 side, and the fixed contact is consumed by the metal vapor generated from the arc foot. Can be suppressed. In addition, since the arc commutation plate portion 450 is made of a metal member such as iron or stainless steel having a melting temperature higher than that of the fixed contacts 411 and 412, the amount of consumption due to the arc is higher than that of the fixed contacts 411 and 412. Can be suppressed. Therefore, the lifetime of the stationary contacts 411 and 412 can be extended, and the reliability of the electromagnetic contactor 10 can be improved.
In the third embodiment, the case where the arc commutation plate portion 450 is formed in an inverted U shape has been described. However, the present invention is not limited to this, and is inverted upside down from FIG. You may make it attach to the lower board part 418 as a substantially U shape.

Furthermore, instead of forming the arc commutation plate portion 450 separately, the arc commutation plate portions 461 and 462 may be directly formed on the lower plate portion 418 as shown in FIG.
Further, the electromagnet unit 500 is not limited to the above-described configuration, and any configuration can be adopted. In short, the movable contact 430 is driven so as to be able to contact with and separate from the pair of fixed contacts 411 and 412. If you can.

In the third embodiment, the contact container case 402 and the cap 530 constitute a sealed container and gas is sealed in the sealed container. However, the present invention is not limited to this. When the current to be applied is low, gas filling may be omitted.
In the first to third embodiments, the case where the present invention is applied to an electromagnetic contactor has been described. However, the present invention is not limited to this, and the present invention is also applied to other electromagnetic switches such as an electromagnetic relay. The invention can be applied.

DESCRIPTION OF SYMBOLS 10 ... Electromagnetic contactor, 100 ... Contact device, 101 ... Contact mechanism, 102 ... Contact storage case (arc-extinguishing chamber), 103 ... A bowl-shaped body, 104 ... Metal square cylinder, 111, 112 ... Fixed contact, 114 ... Support conductor part 115 ... Contact part 130 ... Moving contactor 130a ... Contact part 130b, 130c ... Corner part 131 ... Connecting shaft 133 ... Arc commutation plate part 134 ... Mounting plate part 135 ... Center plate Part, 135a ... through hole, 136a, 136b ... bent part, 137a, 137b ... extension part, 138a, 138b ... arc commutation side plate part, 139 ... contact spring, 145, 146 ... arc extinguishing space, 200 ... electromagnet unit , 201 ... magnetic yoke, 203 ... cylindrical auxiliary yoke, 204 ... spool, 208 ... excitation coil, 210 ... upper magnetic yoke, 211 ... fixed iron core, 212 ... movable iron core, DESCRIPTION OF SYMBOLS 14 ... Return spring, 301 ... Mounting plate part, 302a, 302b ... Arc commutation side plate part, 400 ... Contact device, 401 ... Contact mechanism, 402 ... Contact storage case (arc-extinguishing chamber), 403 ... Rod-like body, 404 ... Metal square cylinder, 411, 412 ... fixed contact, 414 ... support conductor part, 415 ... contact part, 430 ... movable contact, 430a ... contact part, 431 ... connecting shaft, 439 ... contact spring, 445, 446 ... arc Arc extinguishing space, 450 ... arc commutation plate, 500 ... electromagnet unit, 501 ... magnetic yoke, 503 ... cylindrical auxiliary yoke, 504 ... spool, 508 ... excitation coil, 510 ... upper magnetic yoke, 511 ... fixed iron core, 512 ... movable iron core, 514 ... return spring

Claims (6)

1. A pair of fixed contacts fixedly arranged in the arc extinguishing chamber at a predetermined interval;
   A movable contact disposed in the arc extinguishing chamber so as to be capable of contacting and separating from the pair of fixed contacts;
   A conductive arc commutation plate that commutates one of the movable contact and the pair of fixed contacts with a leg of an arc generated when the movable contact is separated from the pair of fixed contacts. A contact device characterized by forming a part.
2. The contact device according to claim 1, wherein the arc commutation plate portion is formed of a metal plate having a melting temperature higher than that of the movable contact.
3. The arc commutation plate part contacts the opposite side of the pair of fixed contacts of the movable contact, and bends and extends in a direction away from the pair of fixed contacts to a position facing the pair of fixed contacts. A mounting plate portion having a bent extension portion, and a pair of arc commutation side plate portions extending from the bent extension portion of the mounting plate portion in contact with the side edge of the movable contact. The contact device according to claim 1 or 2.
4. The arc commutation plate portion includes a mounting plate portion that contacts a surface of the movable contact opposite to the pair of fixed contacts, and both sides of the mounting plate portion facing the pair of fixed contacts. 3. The contact device according to claim 1, comprising a pair of arc commutation side plate portions extending in a direction away from the pair of fixed contacts formed on an edge. 4.
5. The pair of fixed contacts are formed in a C shape from an upper plate portion, an intermediate plate portion, and a lower plate portion,
   The movable contact is disposed between the upper plate portion and the lower plate portion so as to be able to contact and separate from the lower plate portion,
   The contact device according to claim 1 or 2, wherein an arc commutation plate portion is provided on a surface of the lower plate portion of the pair of fixed contacts on the side opposite to the movable contact.
6. The contact device according to any one of claims 1 to 5, wherein the movable contact is connected to a movable iron core of an electromagnet device, and the pair of fixed contacts are connected to an external connection terminal. Features an electromagnetic switch.

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