CN104718591B - Contact making device and the electromagnetism shutter using the contact making device - Google Patents

Abstract

The present invention, which is provided, a kind of easily by the contact making device of the arc extinction produced during open circuit between fixed contact and movable contact and can use the electromagnetism shutter of the contact making device.Contact making device possesses a pair of fixed contacts (111), (112) and the movable contact (130) that can be contacted and discretely be arranged with above-mentioned a pair of fixed contacts in above-mentioned arc-chutes that predetermined space and fixed configurations are kept in arc-chutes (102), in the position opposed with above-mentioned a pair of fixed contacts of above-mentioned movable contact, the ARC commutating plate portion (133) for the electric conductivity for making the arc root from electric arc produced during the open circuit that above-mentioned a pair of fixed contacts leave be commutated from the movable contact is formed.

Description

Contact device and electromagnetic switch using same

technical field

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

Background technique

As a contact device for opening and closing the current path, in the past, in electromagnetic switches such as electromagnetic relays and electromagnetic contactors, a variety of closed states for extinguishing the contact mechanism from the contact between the fixed contact and the movable contact have been proposed. A contact mechanism that cuts off the arc generated when the current is turned off and the movable contact is separated from the fixed contact.

For example, there has been proposed an electromagnetic switching device including a pair of fixed contacts each having a fixed contact arranged at a predetermined distance apart, and left and right side contacts arranged separately and in contact with the pair of fixed contacts. A movable contact with a movable contact at the end, an electromagnet device for driving the movable contact, and a casing part for accommodating the movable contact and the fixed contact are arranged parallel to the movable contact on the outside of the casing part. A permanent magnet for arc extinguishing is arranged (for example, refer to Patent Document 1).

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2006-19148

Contents of the invention

technical problem

However, in the conventional example described in the above-mentioned Patent Document 1, although the arc is elongated by the magnetic force of the permanent magnet, and the arc is easily extinguished, the movable contact is turned on from the on state where the movable contact contacts the fixed contact. The root of the arc generated when the separated current is interrupted, that is, when the circuit is broken, moves on the movable contact of the movable contact toward the arc extinguishing space side by the magnetic force of the permanent magnet. Since the arc root of the moved arc stays at the corner of the movable contact, there is an unsolved problem that the movable contact is consumed by metal vapor generated from the arc root.

Therefore, the present invention focuses on the unsolved problems of the above-mentioned conventional examples, and an object of the present invention is to provide a contact capable of suppressing consumption of the movable contact due to an arc generated between the fixed contact and the movable contact when the circuit is disconnected. device and an electromagnetic switch using the contact device.

Technical solutions

In order to achieve the above object, the first aspect of the contact device of the present invention includes: a pair of fixed contacts fixedly arranged in the arc extinguishing chamber with a predetermined interval; a movable contact capable of contacting the pair of fixed contacts and Separately arranged in the above-mentioned arc extinguishing chamber. In addition, a conductive arc reversing plate portion for reversing an arc root of an arc generated when the circuit is disconnected is formed on either one of the movable contact and the pair of fixed contacts, Wherein, the short circuit means that the movable contact is separated from the pair of fixed contacts.

According to the first aspect, the movable contact can be moved from one pair to The arc root of the arc generated when the fixed contacts are separated is diverted from the movable contact to the arc reversing plate portion, and consumption of the movable contact and the pair of fixed contacts on the side where the arc reversing portion is provided can be suppressed.

In addition, in a second aspect of the contact device of 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 the second aspect, since the melting temperature of the arc reversing plate portion is higher than the melting temperature of the movable contact, the arc root of the arc can be reversed toward the arc reversing plate portion, and the arc reversing plate portion can be subjected to damage. damage caused by arcs, thereby suppressing the wear of the movable contact.

In addition, according to a third aspect of the contact device of the present invention, the arc reversing portion is composed of a mounting plate portion and a pair of arc reversing side plate portions, and the mounting plate portion and the movable contact are the same as the pair of arc reversing side plates. The opposite sides of the fixed contacts are in contact, and there is a bent extension part bent and extended in a direction away from the pair of fixed contacts at a position opposite to the pair of fixed contacts, and the pair of arc reversing sides The plate portion is extended from the bent extension portion of the mounting plate portion so as to be in contact with the side edge of the movable contact.

According to the third aspect, the arc commutation plate portion can be easily attached to the movable contact by attaching the mounting plate portion to the surface of the movable contact opposite to the pair of fixed contacts. Furthermore, since the pair of arc commutation side plate portions cover the side surfaces of the movable contact, consumption of the movable contact can be further reduced.

In addition, according to a fourth aspect of the contact device of the present invention, the arc reversing plate portion is composed of a mounting plate portion and a pair of arc reversing side plate portions, and the mounting plate portion and the movable contact are the same as the above-mentioned one. In contact with the surface on the opposite side of the fixed contacts, the pair of arc reversing side plate portions are formed on both side edges of the mounting plate portion at positions opposite to the pair of fixed contacts and along the direction from the pair of fixed contacts. The direction in which the contacts leave is extended.

According to the fourth aspect, the arc reversing plate portion has a pair of arc reversing side plate portions extending from the movable contact to the side opposite to the pair of fixed contacts, so that the arc reversing side plate portion can In the middle, the arc root of the arc is reversed in the direction away from the movable contact.

In addition, according to a fifth aspect of the contact device of the present invention, the pair of fixed contacts are formed in a C-shape by an upper plate portion, an intermediate plate portion, and a lower plate portion, and the movable contact can be in contact with the lower plate portion. The arc commutation plate is provided on the surface of the lower plate of the pair of fixed contacts opposite to the movable contact.

According to the fifth aspect, since the arc reversing plate portion is formed on the side opposite to the movable contact of the pair of fixed contacts, it is possible to direct the arc root of the arc toward the direction from the pair of fixed contacts in the arc reversing plate portion. The head is reversed in the direction opposite to where the movable contact leaves.

In addition, a first aspect of the electromagnetic switching device of the present invention is provided with the contact device of the first to fifth aspects, wherein the movable contactor is connected to the movable iron core of the electromagnet device, and the pair of fixed contacts The head is connected to the external connection terminal.

According to this configuration, it is possible to provide a contact device capable of reliably extinguishing an arc generated at the time of circuit breaking with a simple configuration and improving the breaking performance, and an electromagnetic switch using the contact device.

Beneficial effect

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 disconnected from the pair of fixed contacts, one side of the movable contact and the pair of fixed contacts The arc root of the arc is quickly reversed to the arc reversing plate, and the consumption of one of the movable contact and the pair of fixed contacts can be suppressed. Therefore, the life of the movable contact can be extended.

In addition, by applying the contact device having the above-mentioned effects to an electromagnetic switch, it is possible to provide an electromagnetic contactor that can suppress wear of the movable contact due to an arc generated at the time of circuit breaking with a simple structure and prolong its life. Electromagnetic switches, electromagnetic relays, etc.

Description of drawings

FIG. 1 is a cross-sectional view showing a first embodiment in which the present invention is applied to an electromagnetic contactor.

Fig. 2 is a perspective view showing an arc commutation plate portion of the first embodiment.

Fig. 3 is a cross-sectional view showing the state of arc elongation obtained by the arc deflector plate portion of the first embodiment.

4 is a cross-sectional view showing a second embodiment in which the present invention is applied to an electromagnetic contactor.

Fig. 5 is a perspective view showing an arc commutation plate portion according to a second embodiment.

Fig. 6 is a cross-sectional view showing the state of arc elongation obtained by the arc deflector plate portion of the second embodiment.

7 is a cross-sectional view showing a third embodiment in which the present invention is applied to an electromagnetic contactor.

Fig. 8 is a cross-sectional view showing the state of arc elongation obtained by the arc deflector plate portion of the third embodiment.

Fig. 9 is a perspective view showing an arc commutation plate portion according to a third embodiment.

10 is a perspective view showing an arc commutation plate portion according to a modified example of the third embodiment.

Fig. 11 is a perspective view showing an arc commutation plate portion according to another modified example of the third embodiment.

Symbol Description

10…Magnetic contactor,

100...contact device,

101...contact mechanism,

102...Contact housing (interrupter chamber),

103…barrels,

104…Metal square cylinder,

111, 112...fixed contacts,

114 ... support conductor part,

115...Contact part,

130...movable contact, 130a...contact portion, 130b, 130c...corner portion,

131... connecting shaft,

133...Arc commutation plate,

134... Mounting plate part,

135...central plate portion, 135a...through hole,

136a, 136b...Bending parts,

137a, 137b... extension,

138a, 138b... Arc commutation side plate part,

139 ... contact springs,

145, 146... arc extinguishing space,

200…Electromagnet unit,

201…Yoke,

203…cylindrical auxiliary yoke,

204...Spools,

208...excitation coil,

210...upper yoke,

211…fixed iron core,

212...movable iron core,

214…return spring,

301... Mounting plate part,

302a, 302b... Arc commutation side plate,

400…contact device,

401…contact mechanism,

402...Contact housing (interrupter chamber),

403... flange part,

404…Metal square cylinder,

411, 412...fixed contacts,

414... supporting conductor part,

415... contact part,

430...movable contact, 430a...contact portion,

431…connection shaft,

439… contact spring,

445, 446... arc extinguishing space,

450…Arc commutation plate,

500…Electromagnet unit,

501…Yoke,

503…cylindrical auxiliary yoke,

504... bobbins,

508…excitation coil,

510…upper yoke,

511…fixed iron core,

512…movable iron core,

514…Return spring

detailed description

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 is a cross-sectional view of a first embodiment in which a contact device of the present invention is applied to an electromagnetic contactor, and FIG. 2 is a perspective view showing an arc commutation plate portion of the first embodiment. In FIGS. 1 and 2 , 10 is an electromagnetic contactor, and the electromagnetic contactor 10 is composed of a contact device 100 provided with a contact mechanism and an electromagnet unit 200 that drives the contact device 100 .

As shown in FIGS. 1 and 2 , the contact device 100 has a contact housing case 102 serving as an arc extinguishing chamber for housing the contact mechanism 101 . The contact housing case 102 is composed of an insulating barrel-shaped body 103 with an open lower end and a metal square cylinder 104 joined to the lower end surface of the barrel-shaped body 103 . The metal square cylinder 104 is fixed so that its flange portion 105 is in sealing engagement with an upper yoke 210 of an electromagnet unit 200 to be described later.

In addition, through-holes 106 and 107 into which a pair of fixed contacts 111 and 112 to be described later are inserted are formed in the center portion of the top plate 103 a of the barrel 103 at a predetermined interval.

As shown in FIG. 1 , the contact mechanism 101 includes a pair of fixed contacts 111 and 112 inserted into and fixed to through holes 106 and 107 of a top plate 103 a of a contact housing case 102 . These fixed contacts 111 and 112 respectively include a contact support conductor part 114 having a flange part 113 protruding outward at the upper end inserted into the through holes 106 and 107 of the top plate 103a, and a contact support conductor part 114 connected to the contact support conductor part 114. The contact conductor part 116 of the flat contact part 115 is provided in the lower surface side of the top plate 103a, and is formed in the inside end.

Furthermore, the movable contact 130 made of copper, for example, is disposed so as to face the contact conductor portion 116 of the fixed contacts 111 and 112 from below. The movable contactor 130 is supported by a connection shaft 131 fixed to a movable iron core 212 of the electromagnet unit 200 described later. As shown in FIG. 1 , the movable contactor 130 has a through hole 132 formed in the center portion into which the connecting shaft 131 is inserted.

As for the connecting shaft 131, the retaining ring 131a composed of a C-shaped retaining ring or an E-shaped retaining ring protruding outward is used at its upper end to prevent the dislocation of the fixed ring 131b, and a movable contact is arranged on the lower side of the fixed ring 131b. 130.

In addition, 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 contactor 130 , such as iron, stainless steel, or the like.

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 on the opposite side to the pair of fixed contacts 111 and 112 . The mounting plate portion 134 is composed of a central plate portion 135 having a through hole 135a in which the coupling shaft 131 is inserted in the central portion, and downwardly bent bent portions 136a, 136b formed at both left and right end portions of the central plate portion 135. , Extended portions 137a, 137b extending outward from the lower ends of the bent portions 136a, 136b parallel to the central plate portion 135. In addition, a pair of arc reversing side plate parts 138a and 138b are integrally formed on the front and rear side surfaces of the extension parts 137a and 137b at the left and right ends, respectively extending upward and fitting with the front and rear side surfaces of the movable contact 130 .

Then, the arc reversing plate portion 133 is attached to the movable contact 130 . The installation of the arc reversing plate portion 133 can be carried out by bringing the mounting plate portion 134 into contact with the lower surface of the movable contact 130 on the opposite side to the pair of fixed contacts 111 and 112, and making the movable contact The through hole 132 of the contact 130 is aligned with the through hole 135 a of the mounting plate portion 134 , and the arc reversing side plate portions 138 a, 138 b are fitted to the front and rear sides of the movable contact 130 .

Thereafter, the contact spring 139 wound around the connecting shaft 131 is disposed on the flange portion 133c of the connecting shaft 131 located on the lower side with a predetermined distance from the fixed ring 133b. In this state, the movable contactor 130 and the The connecting shaft 131 is inserted into the through-holes 132 and 135a of the arc reversing plate portion 133, and the fixing ring 133b is fixed by the stop ring 131a. Accordingly, the movable contact 130 and the arc commutation plate portion 133 are arranged on the connection shaft 131 in a state of being pressed against the fixed ring 133 b by the contact spring 139 .

When the movable contact 130 is in the disconnected state, the contact portions 130a at both ends contact the flat contact portion 115 of the lower plate portion of the contact conductor portion 116 of the fixed contacts 111 and 112 with a predetermined interval maintained. separate. In addition, the movable contact 130 is set so that the contact portions at both ends are in flat contact with the lower ends of the contact conductor portions 116 of the fixed contacts 111 and 112 by a predetermined contact pressure of the contact spring 139 in the ON position. The point portion 115 is in contact.

In addition, on the outer peripheral surface of the barrel-shaped body 103 of the contact housing case 102 and the opposing portion of the fixed contacts 111, 112 and the movable contact 130 facing from the front and rear direction, as shown in FIG. A pair of permanent magnets 143 and 144 for arc extinguishing that elongate an arc generated when the movable contact 130 separates from the pair of fixed contacts 111 and 112 .

The magnetic pole surfaces of the pair of arc extinguishing permanent magnets 143 and 144 facing each other in the thickness direction are magnetized to the same polarity, for example, N pole. In addition, arc extinguishing spaces 145 and 146 are formed on both outer sides in the front-rear direction of the positions where the pair of fixed contacts 111 and 112 and the movable contact 130 of the barrel 103 face each other, as shown in FIG. 3 .

Therefore, as shown in FIG. 3, the arc 150 generated when the movable contact 130 separates from the pair of fixed contacts 111 and 112 passes through the magnetic flux from the permanent magnets 143 and 144 for arc extinguishing, and is directed toward the permanent magnet 143 side for arc extinguishing. The side of the arc extinguishing space 145 is elongated.

At this time, on the movable contact 130, the arc reversing side plate parts 138a and 138b of the arc reversing plate part 133 are fitted at the front and rear end parts of the positions facing the pair of fixed contacts 111 and 112. Immediately after the movable contact 130 separates from the pair of fixed contacts 111 and 112 , the root of the arc is located at the corner 130 b exposed at the front and rear ends of the movable contact 130 .

However, at the next moment, the direction is reversed toward the upper side of the arc-reversing side plate portion 138a of the arc-reversing plate portion 133, and the arc root of the arc 150 is elongated by the magnetic flux of the permanent magnets 143 and 144 for arc extinguishing, thereby It moves to the lower end side of the arc reversing side plate parts 138a and 138b, and finally, as shown in FIG.

As shown in FIG. 1 , the electromagnet unit 200 has a U-shaped yoke 201 viewed from the side, and a cylindrical auxiliary yoke 203 is fixed to the center of a bottom plate 202 of the yoke 201 . A bobbin 204 is disposed outside the cylindrical auxiliary yoke 203 .

The bobbin 204 is composed of a central cylindrical portion 205 into which the cylindrical auxiliary yoke 203 is inserted, a lower flange portion 206 protruding radially outward from the lower end portion of the central cylindrical portion 205 , and a The slightly lower side of the upper end is constituted by an upper flange portion 207 protruding radially outward. Furthermore, 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 .

Furthermore, an upper yoke 210 is fixed between upper ends which are open ends of the yoke 201 . The upper yoke 210 has a through-hole 210a formed in the center to fit and support the fixed iron core 211 .

In addition, a fixed iron core 211 is disposed on the upper side of the central cylindrical portion 205 of the bobbin 204 . A movable iron core 212 is arranged at a predetermined distance apart from the fixed iron core 211 on the lower side, and a return spring 214 is arranged between the movable iron core 212 and the fixed iron core 211 . Moreover, the connection shaft 131 which supports the movable contactor 130 is being fixed to the movable iron core 212. As shown in FIG.

Furthermore, the fixed iron core 211 and the movable iron core 212 are made of a non-magnetic material and are covered by a bottomed cylindrical cover 230. At the opening end of the cover 230, a flange portion 231 formed to extend radially outward and an upper portion The lower surface of the yoke 210 is in sealing engagement. Thus, a sealed container in which the contact mechanism 101 , the fixed iron core 211 , and the movable iron core 212 are arranged in a closed space is formed by the contact housing case 102 and the cover 230 . In addition, gases such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, SF ₆ , and He are sealed in the airtight container formed by the contact housing case 102 and the cover 230 .

Next, the operation of the above-mentioned embodiment will be described.

Currently, it is assumed that the fixed contact 111 is connected to a power supply source that supplies a large current, and the fixed contact 112 is connected to a load, for example.

In this state, the excitation coil 208 in the electromagnet unit 200 is set to be in a non-excitation state, and the electromagnet unit 200 is in an off state in which an excitation force for lowering the movable iron core 212 is not generated. In this disconnected state, the movable iron core 212 is pressed by the return spring 214 to move downward from the fixed iron core 211 .

Accordingly, the contact portion 130a of the movable contact 130 of the contact mechanism 101 coupled to the movable iron core 212 via the coupling shaft 131 is separated from the flat contact portions 115 of the fixed contacts 111 and 112 by a predetermined distance and located below. Therefore, the current path between the fixed contacts 111 and 112 is cut off, and the contact mechanism 101 is in an open state.

From this OFF state, in order to supply power to the load, the exciting coil 208 of the electromagnet unit 200 is excited, an exciting force is generated in the electromagnet unit 200, and the movable iron core 212 is attracted by the fixed iron core 211, thereby causing the movable iron core 212 to overcome The urging force of the return spring 214 rises. The upward movement of the movable iron core 212 is stopped when the upper surface of the movable iron core 212 abuts against the lower surface of the fixed iron core 211 .

In this way, by raising the movable iron core 212, the movable contact 130 connected to the movable iron core 212 through the connecting shaft 131 also rises, and the contact part 130a of the contact point 130a is flattened by the contact pressure of the contact spring 139 and the fixed contacts 111 and 112. The contact part 115 contacts.

Therefore, a large current, which is an external power supply source, is supplied to the load in the closed state through the fixed contact 111 , the movable contact 130 , and the fixed contact 112 .

When the current supply to the load is interrupted from the closed state of the contact mechanism 101 , the excitation of the exciting coil 208 of the electromagnet unit 200 is stopped.

Accordingly, since the exciting force for moving the movable iron core 212 upward in the electromagnet unit 200 is lost, the movable iron core 212 is lowered by the urging force of the return spring 214 .

As the movable iron core 212 descends, the movable contactor 130 coupled via the coupling shaft 131 descends. Accordingly, the movable contact 130 is in contact with the fixed 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 separated downward from the fixed contacts 111 and 112 in an off state.

When this disconnection state is established, an arc is generated between the flat contact portion 115 of the fixed contacts 111 and 112 and the contact portion 130 a of the movable contact 130 , and the current conduction state is continued by the arc.

At this time, the opposing magnetic pole faces of the permanent magnets 143 and 144 for arc extinguishing are N poles, and the outer sides thereof are S poles. Therefore, the magnetic flux emitted from the N poles flows from the inside in the longitudinal direction of the movable contactor 130 in plan view. The arc generation part crosses the contact part 115 of the fixed contact 111 and the contact part 130a of the movable contact 130 to the outside and reaches the S pole to form a magnetic field. Similarly, in the long side direction of the movable contact 130, it crosses the arc generating part between the contact portion 115 of the fixed contact 112 and the contact portion 130a of the movable contact 130 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. .

Therefore, the magnetic fluxes of the permanent magnets 143 and 144 for arc extinguishing traverse together in the longitudinal direction of the movable contact 130 in directions opposite to each other between the contact portion 115 of the fixed contact 111 and the contact portion 130 a of the movable contact 130 . between the contact portion 115 of the fixed contact 112 and the contact portion 130 a of the movable contact 130 .

Therefore, between the contact portion 115 of the fixed contact 111 and the contact portion 130a as a contact portion of the movable contact 130, current flows from the fixed contact 111 side to the movable contact 130 side, and the magnetic flux Φ The orientation is from the inside to the outside. Therefore, according to Fleming's left-hand law, an arc is generated that is perpendicular to the longitudinal direction of the movable contact 130 and is perpendicular to the opening and closing direction of the contact portion 115 of the fixed contact 111 and the movable contact 130 and faces the arc extinguishing space. Larger Lorentz force on the 145 side.

Due to this Lorentz force, the arc generated between the contact portion 115 of the fixed contact 111 and the contact portion 130 a of the movable contact 130 passes through the arc extinguishing space from the side surface of the contact portion 115 of the fixed contact 111 . 145 and reaching the upper surface side of the movable contact 130 is greatly elongated to be extinguished.

At this time, by elongating the arc in the outer arc extinguishing space 145 , on the movable contact 130 , the arc root of the arc rapidly travels from the corner 130 b of the movable contact 130 to the arc of the arc reversing plate 133 . The commutation side plate portion 138a commutates, and the arc root of the arc moves sequentially to the lower side of the arc reversing side plate portion 138a. Then, finally, as shown in FIG. 3 , the arc 150 is largely elongated along the inner wall surface of the arc extinguishing space 145 .

Therefore, the time during which the root of the arc stays in the movable contact 130 is short, and consumption of the movable contact 130 can be suppressed. In addition, the distance between the root of the arc between the fixed contact 111 and the movable contact 130 is greatly enlarged, and it is possible to prevent the arc from being caused by the metal vapor generated between the fixed contact 111 and the movable contact 130 due to the influence of the arc. The reduction of the electric field strength, so that the electric field strength between the arc roots can be maintained above the arc voltage. Therefore, it is possible to reliably prevent arc re-occurrence between the electrodes in the vicinity of the arc root of the fixed contact 111 and the movable contact 130, and improve the cutting performance.

On the other hand, in the ON state of the electromagnetic contactor 10, in the state where the positive and negative polarities of the current flowing through the fixed contacts 111 and 112 are reversed, and when it becomes the OFF state, the current from the fixed contact 112 When the current flows toward the fixed contact 111 side through the movable contact 130, the direction of the current becomes the opposite direction, so the Lorentz force acts on the arc extinguishing space 146 side, except that the arc is elongated toward the arc extinguishing space 146 side , to play the same arc extinguishing function.

Thus, according to the above-mentioned first embodiment, from the ON state where the contact portion 130a of the movable contact 130 contacts the contact portion 115 of the fixed contacts 111 and 112, the contact portion 130a of the movable contact 130 is moved from When the contact portion 115 of the fixed contacts 111 and 112 is separated, an arc is generated between the contact portion 130 a of the movable contact 130 and the contact portion 115 of the fixed contacts 111 and 112 . The arc is extended 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 reversing side plate portions 138 a , 138 b of the arc reversing plate portion 133 are fitted on the front and rear side faces of the movable contact 130 facing the pair of fixed contacts 111 , 112 . Therefore, after the arc is generated, as the arc starts to elongate toward the arc extinguishing space 145 or 146, the root of the arc on the movable contact 130 side moves from the corner portion 130b of the movable contact 130 to the arc reversing side plate portion 138a immediately. Or 138b commutation, thereafter, the arc root of the arc moves downward on the arc reversing side plate portion 138a or 138b until the arc is extinguished.

Therefore, the root of the arc does not come into contact with the movable contact 130, and the side of the arc reversing plate 133 receives damage caused by the arc, thereby suppressing damage to the movable contact due to metal vapor generated at the root of the arc. consume. In addition, the arc reversing plate portion 133 is made of a metal member such as iron or stainless steel whose melting temperature is higher than that of the movable contact 130 , so that the consumption due to the arc can be suppressed more than the movable contact 130 .

As a result, the life of movable contactor 130 can be extended, and the reliability of electromagnetic contactor 10 can be improved.

It should be noted that, in the above-mentioned first embodiment, the case where the arc commutation plate portion 133 has the mounting plate portion 134 has been described, but the present invention is not limited to this, and the mounting plate portion 134 may be omitted, and the arc commutation side The plate portions 138a, 138b and the extension portions 137a, 137b connecting the lower portions of the two form a member having a U-shaped cross section, and form the center portion in the front-rear direction of the extension portions 137a, 137b and the lower portion of the movable contact 130. The convex portion in surface contact is fixed to the movable contactor 130 by fixing means such as screws, brazing, welding, or the like.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 to 6 .

In this second embodiment, the shape of the arc commutation plate portion 133 is inverted up and down.

That is, in the second embodiment, the arc reversing plate portion 133 described in the first embodiment is configured such that, as shown in FIG. The flat plate-shaped mounting plate portion 301 that is in contact with the lower surface of the side, and the arc commutation arc that extends downward at the front and rear end portions of the left and right end portions of the mounting plate portion 301 facing the pair of fixed contacts 111 and 112, respectively. Side plate portions 302a, 302b. Here, a through-hole 301 a into which the connecting shaft 131 is inserted is formed at a central portion of the mounting plate portion 301 .

In addition, the arc commutation plate having the above-mentioned configuration is configured in a state where the upper surface of the mounting plate portion 301 is in contact with the lower surface of the movable contact 130 and the through hole 301 a is aligned with the through hole 132 of the movable contact 130 . The part 133 is attached to the connection shaft 131 similarly to the above-mentioned 1st Embodiment.

In this way, the mounting plate portion 301 of the arc reversing plate portion 133 is in contact with the lower surface of the movable contact 130 and mounted on the connecting shaft 131. As shown in FIG. 111, 112 opposite state.

In this state, as shown in FIG. 6 , at the positions facing the pair of fixed contacts 111 and 112 of the movable contact 130 , the arc reversing side plate portions 302 a and 302 b are moved from the front and rear sides where the arc is generated. Front and rear end portions of the movable contact 130 protrude downward in a direction facing away from the pair of fixed contacts 111 , 112 .

The other configurations have the same configurations as those of the aforementioned first embodiment, and the corresponding parts in FIGS. 4 to 6 are denoted by the same reference numerals as those in FIGS. 1 to 3 , and detailed description thereof will be omitted.

Therefore, in the above-mentioned second embodiment, similarly to the above-mentioned first embodiment, in the disconnection start state in which the movable contactor 130 is separated from the fixed contacts 111 and 112, the contact point of the movable contactor 130 An arc is generated between the contact portion 130 a and the contact portion 115 of the pair of fixed contacts 111 , 112 .

The arc root of this arc 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 and 112, but as the two contact portions 130a and 115 are separated, The pair of fixed contacts 111 and 112 and the movable contact 130 move outward in the width direction.

Then, when the magnetic flux passing through the electromagnets 143 and 144 starts to elongate toward the arc extinguishing space 145 or 146, the root of the arc of the movable contact 130 moves downward from the corner 130b of the movable contact 130 on the front and rear sides. . Thereafter, from the lower corner portion 130c of the movable contact 130 to the arc reversing plate portion 133, the root of the arc is on the lower side of the arc reversing side plate portions 302a, 302b of the arc reversing plate portion 133. The movement finally reaches the lower ends of the arc reversing side plate portions 302a and 302b, and the arc is greatly elongated along the inner wall of the arc extinguishing space 145 or 146 as shown in FIG. 6 to be extinguished.

Therefore, according to the second embodiment, by elongating the arc, the root of the arc can be reversed from the movable contact 130 to the arc reversing plate portion 133 , and consumption of the movable contact can be suppressed. As a result, the life of movable contactor 130 can be extended, and the reliability of electromagnetic contactor 10 can be improved.

It should be noted that, in the above-mentioned second embodiment, it is also possible to cut and remove the central portion in the longitudinal direction of the mounting plate portion 301 of the arc commutation plate portion 133, and the mounting plate portion 301 at the left and right ends and the arc commutation side plate The sections 302a, 302b form two sets of arc reversing plate parts with an inverted U-shaped cross section, and these arc reversing plate parts are individually fixed to the pair of movable contacts 130 by fixing means such as screws, brazing, welding, etc. The opposite sides of the fixed contacts 111,112. In this case, the same effect as that of the above-mentioned second embodiment can be obtained.

In addition, in the above-mentioned second embodiment, the side surface of the movable contact 130 can be formed on the upper surface side of the mounting plate portion 301 corresponding to the arc commutation side plate portions 302a and 302b similarly to the above-mentioned first embodiment. The mating arc-reversing side plate portions 138a and 138b.

In addition, in the above-mentioned first embodiment and second embodiment, the case where the arc reversing plate portion and the movable contact 130 are separately configured has been described, but it is not limited to this, and the arc reversing side may be The plate portions 138 a and 138 b are integrally formed with the movable contact 130 .

In addition, in the above-mentioned first and second embodiments, the case where the electromagnet unit 200 has the fixed iron core 211 and the movable iron core 212 has been described, but the present invention is not limited to this, and the fixed iron core 211 may be omitted. A magnetic attraction portion is formed between the upper yoke 210 and the movable iron core 212 .

In addition, the electromagnet unit 200 is not limited to the above configuration, and any configuration can be adopted as long as the movable contact 130 can be driven to contact and separate from the pair of fixed contacts 111 and 112 .

In addition, in the above-mentioned first embodiment and second embodiment, the case where the airtight container is constituted by the contact housing case 102 and the cover 230 and gas is enclosed in the airtight container has been described, but the present invention is not limited thereto. Encapsulation of gas can be omitted when the cut-off current is low.

Next, a third embodiment of the present invention will be described with reference to FIGS. 7 to 9 .

In this third embodiment, instead of attaching the arc reversing plate portion to the movable contact, the method of attaching the arc reversing plate portion to the fixed contact is employed.

That is, in the third embodiment, the electromagnetic contactor 10 is configured as shown in FIG. 7 .

The electromagnetic contactor 10 is composed of a contact device 400 in which a contact mechanism is arranged, and an electromagnet unit 500 that drives the contact device 400 .

As shown in FIGS. 7 and 8 , the contact device 400 has a contact housing case 402 serving as an arc extinguishing chamber for housing the contact mechanism 401 . The contact housing case 402 includes a metal square cylinder 404 having a flange 403 protruding outward at its lower end, and a fixed contact made of a flat ceramic insulating substrate closing the upper end of the metal square cylinder 404 . The insulating substrate 405 is point-supported.

The metal square cylinder 404 is fixed in such a manner that the flange portion 403 is in sealing engagement with the upper yoke 510 of the electromagnet unit 500 described later.

In addition, through-holes 406 and 407 into which a pair of fixed contacts 411 and 412 to be described later are inserted are formed at a central portion of the fixed-contact supporting insulating substrate 405 with a predetermined interval. Furthermore, a contact support insulating substrate 405 is fixed by soldering to the upper surface of the square cylinder 404 .

As shown in FIG. 7 , the contact mechanism 401 includes a pair of fixed contacts 411 and 412 inserted into and fixed through holes 406 and 407 of a fixed contact supporting insulating substrate 405 of the contact housing case 402 . These fixed contacts 411 and 412 respectively include 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 connected to the support conductor portion 414. On the other hand, a C-shaped portion 415 is arranged on the lower surface side of the fixed contact supporting insulating substrate 405 and opens inside.

The C-shaped portion 415 is composed of 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 an intermediate plate portion 417 extending downward from the outer end of the upper plate portion 416. The lower end side of 417 is parallel to the upper plate portion 416 and the lower plate portion 418 is formed in a C-shape extending inwardly, that is, toward the direction facing the fixed contacts 411 and 412 .

Here, the support conductor portion 414 and the C-shaped portion 415 are formed by inserting the pin 414a protruding from the lower end surface of the support conductor portion 414 into the through-hole 420 formed on the upper plate portion 416 of the C-shaped portion 415. In this state, it is fixed, for example, by brazing. It should be noted that the fixing of the support conductor portion 414 and the C-shaped portion 415 is not limited to soldering, and the pin 414a may be fitted into the through hole 420, or an external thread may be formed on the pin 414a and an internal thread may be formed on the through hole 420. Make both screw tight.

In addition, a C-shaped magnetic plate 419 in a plan view is attached 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 . Thus, by arranging the magnetic plate 419 to cover the inner surface of the intermediate plate portion 417 , it is possible to shield the magnetic field generated by the current flowing through the intermediate plate portion 417 .

The magnetic plate 419 may be formed to cover the periphery of the intermediate plate portion 417 as long as it can shield the magnetic field generated by the current flowing through the intermediate plate portion 417 .

Further, insulating covers 421 made of a synthetic resin material are attached to the C-shaped portions 415 of the fixed contacts 411 and 412 to control arc generation.

In this way, 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 to form a contact. Section 418a.

Then, the movable contact 430 is arranged such that both end portions are arranged inside the C-shaped portion 415 of the fixed contacts 411 and 412 . The movable contactor 430 is supported by a connection shaft 431 fixed to a movable plunger 515 of an electromagnet unit 500 described later. As shown in FIG. 7 , in this movable contactor 430 , a recess 432 protruding downward is formed in the vicinity of the connection shaft 431 at the center, and a through hole 433 into which the connection shaft 431 is inserted is formed in the recess 432 .

The coupling shaft 431 has a flange portion 431a protruding outward at its upper end. The contact spring 434 is put on the connection shaft 431 from the lower end side, and then inserted into the through hole 433 of the movable contact 430, the upper end of the contact spring 434 is brought into contact with the flange portion 431a, and a predetermined force is obtained by the contact spring 434. The way of pushing force is, for example, fixing the position of the movable contact 430 through the C-shaped retaining ring 435 .

When the movable contact 430 is in the off state, the contact portions 430a at both ends are separated from the contact portion 418a of the lower plate portion 418 of the C-shaped portion 415 of the fixed contacts 411 and 412 at a predetermined distance. In addition, the movable contact 430 is set so that the contact portions 430a at both ends and the lower plate of the C-shaped portion 415 of the fixed contacts 411 and 412 are connected by a predetermined contact pressure generated by the contact spring 434 in the ON position. The contact portion 418a of the portion 418 is in contact.

In addition, permanent magnets 443 and 444 for arc extinguishing which elongate the arc and extinguish the arc are arranged on the outer peripheral surface in the front-rear direction of the rectangular cylinder 404 of the contact housing case 402 as shown in FIG. 8 .

In addition, on the inner peripheral surface of the square cylinder 404 of the contact housing case 402, as shown in FIGS. In the insulating cylinder 440 , arc extinguishing chambers 445 and 446 are respectively formed at front and rear positions where the contact portion 418 a of the fixed contacts 411 and 412 and the contact portion 418 of the movable contact 430 face each other.

In addition, in the lower plate portion 418 of the fixed contacts 411 and 412 , an arc commutation plate portion 450 is fixed to the lower surface side of the contact portion 418 a facing the contact portion 430 a 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, stainless steel, or the like.

As shown in FIGS. 8 and 9 , the arc reversing plate portion 450 is composed of an upper plate portion 451 and front and rear side plate portions 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 . 452 and 453 are formed in a substantially inverted U shape.

As shown in FIG. 7 , the electromagnet unit 500 has a flat U-shaped yoke 501 viewed from the side, and a cylindrical auxiliary yoke 503 is fixed to the center of a bottom plate 502 of the yoke 501 . A bobbin 504 is disposed outside the cylindrical auxiliary yoke 503 .

The bobbin 504 is composed of a central cylindrical portion 505 into which the cylindrical auxiliary yoke 503 is inserted, a lower flange portion 506 protruding radially outward from the lower end portion of the central cylindrical portion 505 , and a flange extending from the central cylindrical portion 505 . An upper flange portion 507 whose upper end protrudes outward in the radial direction is formed. Furthermore, 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 .

Furthermore, an upper yoke 510 is fixed between upper ends serving as opening ends of the yoke 501 . In the upper yoke 510 , a through hole 510 a facing the central cylindrical portion 505 of the bobbin 504 is formed in the central portion.

In addition, in the central cylindrical portion 505 of the bobbin 504, a movable plunger 515 with a return spring 514 installed between the bottom portion and the bottom plate portion 502 of the yoke 501 is disposed, and the movable plunger 515 can be moved up and down. slide. In this movable plunger 515 , a peripheral flange portion 516 protruding radially outward is formed at an upper end portion protruding upward from the upper yoke 510 .

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

Further, an auxiliary yoke 525 having the same outer shape as the permanent magnet 520 and having a through hole 524 having an inner diameter smaller than the outer diameter of the peripheral flange portion 516 of the movable plunger 515 is fixed to the upper end surface of the permanent magnet 520 . The peripheral flange portion 516 of the movable plunger 515 is in contact with the lower surface of the auxiliary yoke 525 .

In addition, a coupling shaft 431 that supports the movable contactor 430 is screwed to the upper end surface of the movable plunger 515 .

Furthermore, the movable plunger 515 is made of a non-magnetic material and is covered by a bottomed cylindrical cover 530 , and at the opening end of the cover 530 , a flange portion 531 formed extending radially outward and the upper yoke 510 The lower surface of the sealing joint. Thus, the arc extinguishing chamber 402 and the cover 530 form a sealed container that communicates through the through hole 510 a of the upper yoke 510 . In addition, gases such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, and SF ₆ are enclosed in the airtight container formed by the arc extinguishing chamber 402 and the cover 530 .

According to the third embodiment, the movable plunger 515 is pushed upward by the return spring 514 while the excitation coil 508 of the electromagnet unit 500 is in a non-energized state. Therefore, as shown in FIG. 7 , the peripheral flange portion 516 of the movable plunger 515 comes into contact with the lower surface of the auxiliary yoke 525 , and the movable contact 430 separates upward from the lower plate portion 418 of the fixed contacts 411 and 412 . Therefore, the circuit between the fixed contacts 411 and 412 is in a cut-off state, and the contact mechanism 401 is in an open-circuit state.

In this way, in the off state of the electromagnet unit 500, since both the biasing force of the return spring 514 and the attractive force of the annular permanent magnet 520 act on the movable plunger 515, the movable plunger 515 will not be Unexpected drop due to external vibration and/or shock, etc., can reliably prevent malfunction.

From this off state, when the excitation coil 508 of the electromagnet unit 500 is excited, an excitation force is generated in the electromagnet unit 500, and the movable plunger 515 overcomes the force of the return spring 514 and the annular permanent magnet 520. Press down on the attractive force.

Also, the movable plunger 515 falls rapidly against the force of the return spring 514 and the attractive force of the annular permanent magnet 520 . Thereby, the descent 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 yoke 510 .

In this way, when the movable plunger 515 is lowered, the movable contact 430 connected to the movable plunger 515 via the connecting shaft 431 is also lowered, and the contact portion 430 a of the contact portion 430 a contacts the fixed contact 411 and the fixed contact 411 by the contact pressure of the contact spring 434 . Contact portion 418a of 412 contacts.

Therefore, a large current serving as an external power supply source is supplied to the load in the closed state 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 exciting coil 508 of the electromagnet unit 500 is stopped.

As a result, since the exciting force for moving the movable plunger 515 downward in the electromagnet unit 500 disappears, the movable plunger 515 rises due to the urging force of the return spring 514, and the peripheral flange portion 516 approaches the auxiliary yoke 525. The attractive force of the ring-shaped permanent magnet 520 increases.

By raising the movable plunger 515 , the movable contact 430 connected via the connecting shaft 431 is raised. Accordingly, 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 separated upward from the fixed contacts 411 and 412 to be in the disconnected state.

When this disconnection state is established, an arc is generated between the contact portion 418 a of the fixed contacts 411 and 412 and the contact portion 430 a of the movable contact 430 , and the current conduction state is continued by the arc. At this time, since the insulating cover 421 covering the upper plate portion 416 and the middle plate portion 417 of the C-shaped portion 415 of the fixed contacts 411 and 412 is installed, it is possible to connect only the contact portion 418a of the fixed contacts 411 and 412 to the contact portion 418a. An arc is generated between the contact portions 430 a of the movable contactor 430 . Therefore, it is possible to reliably prevent the arc from moving on the C-shaped portion 415 of the fixed contacts 411 and 412 , stabilize the generation state of the arc, and improve the arc extinguishing performance. Furthermore, since both side surfaces of the fixed contacts 411 and 412 are also covered by the insulating cover 421, it is also possible to reliably prevent short-circuiting at the tip of the arc.

In addition, since the upper plate portion 416 and the middle plate portion 417 of the C-shaped portion 415 are covered by the insulating cover 421 , the upper plate portion 416 and the middle plate portion of the C-shaped portion 415 pass through both ends of the movable contact 430 . The insulation cover 421 between 417 can ensure the insulation distance, and can shorten the height of the movable contactor 430 in the movable direction. Therefore, the contact device 400 can be miniaturized.

In addition, the root of the arc generated between the contact portion 418a of the fixed contacts 411 and 412 and the contact portion 430a of the movable contact 430 is elongated by the arc extinguishing permanent magnet 444 as shown in FIG. 8 . Therefore, on the movable contactor 430 side, the direction is reversed toward the upper end side along the side surface. On the other hand, in the lower plate portion 418 of the fixed contacts 411 and 412, as shown in FIG. lower end.

As a result, the arc root does not come into contact with the fixed contacts 411 and 412, and the arc reversing plate portion 450 side receives damage caused by the arc, thereby suppressing damage to the fixed contacts due to metal vapor generated by the arc root. consumption. Furthermore, the arc commutation plate portion 450 is made of a metal member such as iron or stainless steel whose melting temperature is higher than that of the fixed contacts 411 and 412 , so that the arc consumption can be suppressed more than the fixed contacts 411 and 412 . Therefore, the lifetime of the fixed contacts 411 and 412 can be extended, and the reliability of the electromagnetic contactor 10 can be improved.

It should be noted that, in the above-mentioned third embodiment, the case where the arc commutation plate portion 450 is formed in an inverted U-shape has been described. It is mounted on the lower plate part 418 in a letter shape.

In addition, as shown in FIG. 11 , instead of forming the arc reversing plate 450 separately, the arc reversing plate 461 and 462 may be directly formed on the lower plate 418 .

In addition, the electromagnet unit 500 is not limited to the above configuration, and any configuration can be adopted as long as the movable contact 430 can be driven so that the movable contact 430 can contact and separate from the pair of fixed contacts 411 and 412 .

In addition, in the above-mentioned third embodiment, the case where the airtight container is constituted by the contact housing case 402 and the cover 530 and gas is enclosed in the airtight container has been described, but the present invention is not limited thereto, and the current cutoff may be When it is low, the filling of gas is omitted.

In addition, in the above-mentioned first to third embodiments, the case where the present invention is applied to an electromagnetic contactor has been described, but the present invention is not limited to this, and other electromagnetic switches such as electromagnetic relays may also be used. Apply the invention.

Claims (3)

1. A contact device, characterized in that, possesses: A pair of fixed contacts are fixedly arranged in the arc extinguishing chamber with a predetermined interval; a movable contact arranged in the arc extinguishing chamber so as to be in contact with and separate from the pair of fixed contacts, In addition, a conductive arc reversing plate portion is formed on the movable contact, and the arc reversing plate portion reverses the root of the arc generated when the circuit is broken, wherein the circuit breaker refers to the arc root of the movable contact. head is separated from the pair of fixed contacts, The arc reversing plate portion is composed of a mounting plate portion and an arc reversing side plate portion, the mounting plate portion is in contact with the side of the movable contact opposite to the pair of fixed contacts, and is in contact with the pair of fixed contacts. The positions where the pair of fixed contacts face each other have bent and extended bending extensions along the direction away from the pair of fixed contacts, and a pair of arcs are respectively formed on each of the bending extensions of the mounting plate portion. Each of the arc reversing side plate portions is extended so as to be in contact with a side edge of the movable contact. 2. The contact device according to claim 1, characterized in that, The arc commutation plate portion is formed of a metal plate having a melting temperature higher than that of the movable contact. 3. An electromagnetic switch, characterized in that, The contact device according to claim 1 or 2 is provided, wherein the movable contact is connected to a movable iron core of the electromagnet device, and the pair of fixed contacts are connected to external connection terminals.