WO2013051263A1 - 接点装置及びこれを使用した電磁接触器 - Google Patents
接点装置及びこれを使用した電磁接触器 Download PDFInfo
- Publication number
- WO2013051263A1 WO2013051263A1 PCT/JP2012/006358 JP2012006358W WO2013051263A1 WO 2013051263 A1 WO2013051263 A1 WO 2013051263A1 JP 2012006358 W JP2012006358 W JP 2012006358W WO 2013051263 A1 WO2013051263 A1 WO 2013051263A1
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- WIPO (PCT)
- Prior art keywords
- contact
- movable
- plate portion
- fixed
- movable contact
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
- H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/546—Contact arrangements for contactors having bridging contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
- H01H50/641—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rectilinear movement
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
- H01H51/22—Polarised relays
- H01H51/2209—Polarised relays with rectilinearly movable armature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
- H01H9/443—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
- H01H50/023—Details concerning sealing, e.g. sealing casing with resin
- H01H2050/025—Details concerning sealing, e.g. sealing casing with resin containing inert or dielectric gasses, e.g. SF6, for arc prevention or arc extinction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
- H01H51/28—Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
- H01H51/284—Polarised relays
Definitions
- the present invention relates to a contact device including a fixed contact and a movable contact inserted in a current path and an electromagnetic contactor using the contact device, and to an electromagnetic repulsive force that separates the movable contact from the fixed contact during energization. It is designed to generate a Lorentz force to resist.
- a contact mechanism for opening and closing a current path for example, a fixed contact as a fixed contact applied to a switch in which an arc is generated in a container when current is interrupted, such as a circuit breaker, a current limiter, and an electromagnetic contactor.
- a switch has been proposed in which a child is folded back into a U shape when viewed from the side, a fixed contact is formed at the folded portion, and the movable contact of the movable contact is disposed on the fixed contact so as to be able to contact and separate.
- the opening speed is increased by increasing the electromagnetic repulsive force acting on the movable contact when a large current is interrupted, and the arc is rapidly stretched (see, for example, Patent Document 1).
- the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and suppresses the electromagnetic repulsive force that opens the movable contact when energized without increasing the overall configuration. It is an object of the present invention to provide a contact device that can be used and an electromagnetic contactor using the contact device.
- a first aspect of a contact device includes a pair of fixed contacts arranged at a predetermined distance, and arranged so as to be able to contact with and separate from the pair of fixed contacts. And a contact mechanism including a movable contact.
- the movable contact has a conductive plate portion extending in a direction intersecting the movable direction in the contact housing case.
- Each of the pair of fixed contacts generates a Lorentz force that resists an electromagnetic repulsive force in the opening direction generated between the fixed contact and the movable contact during energization between the inner conductor plate portion and the outer conductor plate portion.
- An L-shaped conductor portion is formed.
- One end of the inner conductor plate portion faces one end portion of the conductive plate portion of the movable contact, and the other end portion extends outside the contact housing case in parallel with the conductive plate portion.
- the outer conductor plate portion is connected to an outer end portion of the contact housing case of the inner conductor plate portion and extends at least in the separating direction of the movable contact.
- the shape of the stationary contact is, for example, L-shaped or U-shaped, and a Lorentz force is generated that resists the electromagnetic repulsion force in the opening direction generated between the stationary contact and the movable contact during energization. Therefore, the opening of the movable contact during energization with a large current can be suppressed.
- the contact storage case has only the inner conductor plate portion and the movable contact of the fixed contact, and no other conductor, so that it is possible to stabilize the generation of an arc when the current is interrupted.
- a second aspect of the contact device includes a side plate portion in which the outer conductor plate portion is connected to the inner conductor plate portion and extends to the top plate portion of the contact storage case, and the side plate portion A fixed plate portion extending along the outer surface of the top plate portion of the contact housing case is formed in an L shape, and a connection terminal is connected to the fixed plate portion.
- the 3rd aspect of the contact apparatus which concerns on this invention WHEREIN:
- the said contact storage case is comprised with the insulating material.
- a shutoff gas is sealed in the contact storage case. According to this configuration, since the shut-off gas is sealed in the contact housing case, it is possible to effectively extinguish the arc generated when the current is shut off.
- the electromagnetic contactor which concerns on 1 aspect of this invention is equipped with the contact apparatus of any one aspect of the said 1st thru
- the spring of the contact spring that makes the movable contact contact the fixed contact by generating a Lorentz force against the electromagnetic repulsion force that opens the gap between the movable contact and the fixed contact when the electromagnetic contactor is energized.
- the power can be reduced.
- the thrust of the electromagnet that drives the movable contact can also be reduced, and a small electromagnetic contactor can be provided.
- an electromagnetic repulsion force in the opening direction generated in the stator contact and the movable contact when a large current is supplied to the contact mechanism having the fixed contact and the movable contact inserted in the energization path is resisted.
- Lorentz force can be generated. For this reason, it is possible to reliably prevent the opening of the movable contact when energizing a large current without using a mechanical pressing force.
- FIG. 1 is a cross-sectional view showing an embodiment in which the contact device according to the present invention is applied to an electromagnetic contactor.
- 1 is a main body case made of, for example, a synthetic resin.
- the main body case 1 has a two-part structure of an upper case 1a and a lower case 1b as contact storage cases.
- the upper case 1a is equipped with a contact device CD.
- the contact device CD includes a pair of fixed contacts 2 fixedly disposed on the upper case 1a, and a movable contact 3 disposed so as to be able to contact with and separate from the fixed contacts 2.
- an operation electromagnet 4 for driving the movable contact 3 is disposed.
- the electromagnet 4 for operation has a stationary iron core 5 formed of an E-shaped laminated steel plate and a movable iron core 6 formed of an E-shaped laminated steel plate facing each other.
- An electromagnetic coil 8 supplied with a single-phase alternating current wound around a coil holder 7 is fixed to the central leg 5a of the fixed iron core 5.
- a return spring 9 is provided between the upper surface of the coil holder 7 and the root of the central leg 6 a of the movable iron core 6 to urge the movable iron core 6 in a direction away from the fixed iron core 5.
- a shading coil 10 is embedded in the upper end surface of the outer leg portion of the fixed iron core 5.
- the shading coil 10 can suppress fluctuations in electromagnetic attraction, noise, and vibration due to changes in alternating magnetic flux in the single-phase AC electromagnet.
- a contact holder 11 is connected to the upper end of the movable iron core 6. The contact holder 11 is pressed downward into an insertion hole 11a formed in a direction perpendicular to the axis on the upper end side thereof so that the movable contact 3 obtains a predetermined contact pressure against the fixed contact 2 by the contact spring 12. Being held. As shown in an enlarged view in FIG.
- the movable contact 3 is composed of an elongated plate-like conductive plate portion 3a extending in a direction orthogonal to the movable direction pressed by the contact spring 12, and this conductive plate Movable contact portions 3b and 3c are formed on the lower surfaces of both ends of the portion 3a.
- the fixed contact 2 supports a pair of fixed contact portions 2a and 2b opposed to the movable contact portion 3b of the movable contact 3 from below, and the other end is conductive.
- Inner conductor plate portions 2c and 2d extending outwardly of the upper case 1a in parallel with the plate portion 3a and extending from the other end outside the upper case 1a of the inner conductor plate portions 2c and 2d along the upper case 1a L-shaped conductive plate portions 2g and 2h formed by outer conductor plate portions 2e and 2f extending upward, that is, in the direction of separation of the movable contact 3, are provided.
- external connection terminals 2i and 2j extending outward in the left-right direction are connected to the upper ends of these L-shaped conductive plate portions 2g and 2h.
- the movable contact 3 In the state where the movable iron core 6 is in the current interruption position, the movable contact 3 is in contact with the bottom of the insertion hole 11a of the contact holder 11 by the contact spring 12, as shown in FIG. In this state, the movable contact portions 3b and 3c formed on both ends of the conductive plate portion 3a of the movable contact 3 are spaced upward from the fixed contact portions 2a and 2b of the fixed contact 2, and the contact device CD is Current interruption state.
- a large current of, for example, several hundred to several hundreds of A input from the external connection terminal 2i of the fixed contact 2 connected to a DC power source (not shown) is applied to the outer conductor plate portion 2e.
- a DC power source (not shown)
- the large current supplied to the movable contact portion 3b is supplied to the fixed contact portion 2b through the conductive plate portion 3a and the movable contact portion 3c.
- the large current supplied to the fixed contact portion 2b is supplied to the inner conductor plate portion 2d, the outer conductor plate portion 2f, and the external connection terminal 2j to form an energization path that is supplied to an external load.
- the fixed contact 2 has the L-shaped conductive plate portions 2g and 2h formed by the inner conductive plate portions 2c and 2d and the outer conductive plate portions 2e and 2f.
- the magnetic flux due to the current flowing through the outer conductor plate portions 2e and 2f is added to the magnetic flux on the upper side of the movable contact 3 as compared with the case where only the movable contact 3 exists, and the magnetic flux density is increased. To increase.
- the movable contact 3 faces the inner conductor plate portions 2c and 2d of the fixed contact 2, and the outer conductor plate portions 2e and 2f of the fixed contact 2 are different from the upper case 1a.
- the side plates are opposed to each other. For this reason, since there is no conductor plate portion in the direction away from the inner conductor plate portions 2c and 2d of the fixed contact 2 of the movable contact 3, the arc generated when the current is interrupted is caused by the inner conductor plate of the fixed contact 2.
- the electromagnetic contactor itself can be downsized. That is, in the second embodiment, the electromagnetic contactor is configured as shown in FIG. In FIG. 3, reference numeral 50 denotes an electromagnetic contactor, and this electromagnetic contactor 50 includes an exterior insulating container 51 made of, for example, a synthetic resin.
- the exterior insulating container 51 is composed of a lower case 52 constituted by a bottomed cylinder whose upper end surface is opened, and a bottomed cylinder opened by a lower end attached to the upper end surface of the lower case 52.
- An upper case 53 is included.
- a contact device 100 in which a contact mechanism is arranged and an electromagnet unit 200 that drives the contact device 100 are accommodated in a relationship in which the electromagnet unit 200 is arranged on the bottom plate of the lower case 52.
- the contact device 100 has a contact storage case 102 for storing the contact mechanism 101, as is apparent with reference to FIG.
- the contact housing case 102 is formed into a bowl-shaped body by integrally molding a rectangular tube portion 102a and a top plate portion 102b that closes the upper end of the rectangular tube portion 102a, for example, using ceramic or a synthetic resin material.
- a metal foil is formed on the open end face side of the bowl to form a metal foil, and a metal connection member 304 is sealed and joined to the metal foil to constitute the contact housing case 102.
- a connection member 304 of the contact housing case 102 is sealed and joined to an upper magnetic yoke 210 described later.
- the contact mechanism 101 includes a pair of fixed contacts 111 and 112 fixedly disposed on the left and right side plate portions of the contact storage case 102, and the fixed contacts 111 and 112 are arranged so as to be freely contacted and separated from above. And a movable contact 130 provided.
- Each of the pair of fixed contacts 111 and 112 includes an inner conductor plate portion 117 fixed through the left and right side plate portions of the rectangular tube portion 102 a of the contact storage case 102, and the contact storage case 102 of the inner conductor plate portion 117.
- An L-shaped conductor portion 119 is formed by an outer conductor plate portion 118 that is connected to an end portion on the outer peripheral surface side and extends at least in the separating direction of the movable contact.
- the upper end portion of the outer conductor plate portion 118 of the L-shaped conductor portion 119 is extended to the top plate portion 102b of the contact housing case 102, and the upper end portion of the outer conductor plate portion 118 is bent along the top plate portion 102b.
- a fixed conductor 120 facing the movable contact 130 is formed.
- An external connection terminal 121 is formed at the inner end of the fixed conductor portion 120. Therefore, the pair of fixed contacts 111 and 112 is a C-shape that surrounds the extended end portion of the movable contact 130 with the L-shaped conductor portion 119 and the fixed conductor portion 120 connected to the upper end of the outer conductor plate portion 118. Configured.
- the inner conductor plate portion 117 and the outer conductor plate portion 118 are fixed by brazing, for example.
- the fixing of the inner conductor plate portion 117 and the outer conductor plate portion 118 is not limited to brazing, and may be welded.
- a contact portion 117 a is formed in which the inner end portions of the inner conductor plate portions 117 of the fixed contacts 111 and 112 are opposed to the end portions in the extension direction of the movable contact 130 from the lower side.
- the movable contact 130 is disposed so as to face the contact portion 117a of the fixed contacts 111 and 112 from above.
- the movable contact 130 is formed of a conductive plate portion extending in a direction intersecting the movable direction.
- the movable contact 130 is supported by a connecting shaft 131 fixed to a movable plunger 215 of an electromagnet unit 200 described later.
- the movable contact 130 is formed with a recess 132 that protrudes downward in the vicinity of the central connection shaft 131, and a through-hole 133 through which the connection shaft 131 is inserted is formed in the recess 132.
- the connecting shaft 131 has a flange 131a protruding outward at the upper end.
- the connecting shaft 131 is inserted into the contact spring 134 from the lower end side, and then inserted into the through hole 133 of the movable contact 130 so that the upper end of the contact spring 134 is brought into contact with the flange portion 131a.
- the movable contact 130 is positioned by, for example, a C-ring 135 so as to obtain a force.
- the movable contact 130 is in a released state, and the contact portions at both ends and the contact portions 117a of the inner conductor plate portion 117 of the L-shaped conductor portions 119 of the fixed contacts 111 and 112 are spaced apart from each other by a predetermined distance. Become. Further, the movable contact 130 has a predetermined contact pressure by the contact spring 134 at the closing position, with contact portions at both ends being applied to the contact portion 117a of the inner conductor plate portion 117 of the L-shaped conductor portion 119 of the fixed contacts 111 and 112. Is set to touch.
- magnet housing cylinders 141 and 142 are formed on the inner peripheral surface of the contact housing case 102 at positions facing the side surfaces of the movable contact 130.
- arc extinguishing permanent magnets 143 and 144 are inserted and fixed.
- These arc extinguishing permanent magnets 143 and 144 are magnetized so that their opposing magnetic pole faces become N poles in the thickness direction.
- the arc extinguishing permanent magnets 143 and 144 are opposed to the contact portions 117a of the fixed contacts 111 and 112 and the contact portions 130a of the movable contact 130, as shown in FIG. It is set to be slightly inside the position.
- Arc extinguishing spaces 146 and 147 are formed outside the magnet housing cylinders 141 and 142 in the left-right direction, respectively.
- movable contact guide members 148 and 149 that slide in contact with the movable contact 130 and restrict the rotation of the movable contact 130 on the side edges of the magnet housing cylinders 141 and 142 near both ends of the movable contact 130 are formed to protrude.
- the arc extinguishing permanent magnets 143 and 144 can be brought close to the movable contact 130.
- the magnetic flux ⁇ generated from the N pole side of both arc extinguishing permanent magnets 143 and 144 causes the facing portion between the contact portion 117a of the stationary contactors 111 and 112 and the contact portion 130a of the movable contactor 130 in the left-right direction. Crossing from inside to outside with a large magnetic flux density.
- the electromagnet unit 200 has a U-shaped magnetic yoke 201 that is flat when 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. Yes.
- 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 210 a facing the central cylindrical portion 205 of the spool 204 at the central portion.
- a movable plunger 215 having a return spring 214 disposed between the bottom portion and the bottom plate portion 202 of the magnetic yoke 201 is slidably disposed.
- the movable plunger 215 is formed with a peripheral flange portion 216 protruding outward in the radial direction at an upper end portion protruding upward from the upper magnetic yoke 210.
- the movable plunger 215 is covered with a cap 230 made of a non-magnetic material and formed in 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 has an upper magnetic portion. Sealed to the lower surface of the yoke 210.
- a sealed container is formed in which the contact housing case 102 and the cap 230 are communicated with each other via the through hole 210 a of the upper magnetic yoke 210.
- a sealed container formed by the contact housing case 102 and the cap 230 is filled with an arc extinguishing gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF 6 .
- annularly formed permanent magnet 220 is fixed on the upper surface of the upper magnetic yoke 210 so as to surround the peripheral flange portion 216 of the movable plunger 215.
- the permanent magnet 220 is magnetized so that the upper end side is an N pole and the lower end side is an S pole in the vertical direction, that is, the thickness direction.
- An auxiliary yoke 225 having a through hole 224 having the same outer shape as the permanent magnet 220 and having an inner diameter smaller than the outer diameter of the peripheral flange portion 216 of the movable plunger 215 is fixed to the upper end surface of the permanent magnet 220.
- the peripheral flange 216 of the movable plunger 215 is in contact with the lower surface of the auxiliary yoke 225.
- the shape of the permanent magnet 220 is not limited to the above, and can be formed in an annular shape. In short, if the inner peripheral surface is a cylindrical surface, the outer shape can be an arbitrary shape.
- a connecting shaft 131 that supports the movable contact 130 is screwed to the upper end surface of the movable plunger 215.
- the movable plunger 215 is urged upward by the return spring 214, so that the upper surface of the peripheral flange portion 216 is in the released position where it abuts the lower surface of the auxiliary yoke 225.
- the contact part 130a of the movable contactor 130 is separated upward from the contact part 117a of the fixed contactors 111 and 112, and the current is interrupted.
- the external connection terminal plate 151 is connected to a power supply source that supplies a large current, for example, and the external connection terminal plate 152 is connected to a load.
- the exciting coil 208 in the electromagnet unit 200 is in a non-energized state and the electromagnet unit 200 is in a released state in which no exciting force for lowering the movable plunger 215 is generated.
- the movable plunger 215 is urged upward by the return spring 214 away from the upper magnetic yoke 210.
- the attractive force due to the magnetic force of the permanent magnet 220 is applied to the auxiliary yoke 225, and the peripheral flange 216 of the movable plunger 215 is attracted. For this reason, the upper surface of the peripheral flange 216 of the movable plunger 215 is in contact with the lower surface of the auxiliary yoke 225.
- the contact part 130a of the movable contact 130 of the contact mechanism 101 connected to the movable plunger 215 via the connecting shaft 131 is spaced apart from the contact part 117a of the fixed contacts 111 and 112 upward by a predetermined distance. .
- the current path between the stationary contacts 111 and 112 is in an interrupted state, and the contact mechanism 101 is in an open state.
- both the urging force of the return spring 214 and the attractive force of the annular permanent magnet 220 are acting on the movable plunger 215, so that the movable plunger 215 is inadvertently lowered due to vibration from the outside. And malfunction can be reliably prevented.
- the fixed contacts 111 and 112 have the C-shaped portion 122 formed by the fixed conductor portion 120, the outer conductor plate portion 118, and the inner conductor plate portion 117. And the inner conductor plate portion 117 and the movable contact 130 in contact therewith, a current in the reverse direction flows.
- the magnetic field and the movable contact formed by the fixed conductor portion 120 of the fixed contacts 111 and 112 are movable.
- a larger Lorentz force can be generated by pressing the movable contact 130 against the contact portions 117a of the fixed contacts 111 and 112 according to the Fleming left-hand rule from the relationship of the current flowing through the child 130.
- the movable contact 130 connected via the connecting shaft 131 rises.
- the movable contact 130 is in contact with the stationary contacts 111 and 112 while the contact pressure is applied by the contact spring 134.
- the contact pressure of the contact spring 134 disappears, the movable contact 130 is in a state of opening opening in which the movable contact 130 is separated upward from the fixed contacts 111 and 112.
- 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 used as the arc extinguishing permanent magnets 143 and 144.
- a magnetic field is formed by crossing the arc generation part of the contact part 117a of the fixed contactor 111 and the contact part 130a of the movable contactor 130 from the inside to the outside in the longitudinal direction of the movable contactor 130 to reach the S pole. .
- the arc generation part of the contact part 117a of the fixed contactor 112 and the contact part 130a of the movable contactor 130 crosses from the inside to the outside in the longitudinal direction of the movable contactor 130 and reaches the S pole to form a magnetic field.
- the magnetic fluxes of the arc extinguishing permanent magnets 143 and 144 are both between the contact portion 117a of the fixed contact 111 and the contact portion 130a of the movable contact 130, and between the contact portion 117a 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. Therefore, between the contact portion 117a of the fixed contact 111 and the contact portion 130a of the movable contact 130, the current I flows from the fixed contact 111 side to the movable contact 130 side, and the direction of the magnetic flux ⁇ is from the inside. The direction is toward the outside.
- the arc extinguishing space 145 is directed to the arc extinguishing space 145 side orthogonal to the longitudinal direction of the movable contact 130 and orthogonal to the opening / closing direction of the contact portion 117a of the fixed contact 111 and the movable contact 130.
- a large Lorentz force acts.
- the arc stretched to the arc extinguishing space 145 by the tilted magnetic flux is further stretched in the direction of the corner of the arc extinguishing space 145, the arc length can be increased, and good interruption performance can be obtained. .
- the arc extinguishing space 145 is directed to the arc extinguishing space 145 side orthogonal to the longitudinal direction of the movable contact 130 and orthogonal to the movable direction of the contact portion 117a of the fixed contact 112 and the movable contact 130.
- a large Lorentz force acts.
- an arc generated between the contact portion 117a of the fixed contact 112 and the movable contact 130 passes through the arc extinguishing space 145 from the upper surface side of the movable contact 130 and the side surface of the fixed contact 112. It is greatly stretched to reach the side and extinguished. Further, in the arc extinguishing space 145, as described above, on the lower side and the upper side, on the lower side with respect to the direction of the magnetic flux between the contact part 117a of the stationary contact 112 and the contact part 130a of the movable contact 130, and The magnetic flux is inclined upward.
- the arc stretched to the arc extinguishing space 145 by the tilted magnetic flux is further stretched in the direction of the corner of the arc extinguishing space 145, the arc length can be increased, and good interruption performance can be obtained. .
- the insulating cylindrical body 140 can cover and insulate the inner peripheral surface of the metal contact housing case 102, there is no short circuit of the arc at the time of current interruption, and current interruption can be surely performed. Furthermore, since the insulating function, the positioning function of the arc extinguishing permanent magnets 143 and 144 and the arc extinguishing permanent magnets 143 and 144 can be protected from the arc by one insulating cylinder 140, the manufacturing cost can be reduced. Can be reduced.
- the outer conductor plate portion 118 and the fixed conductor portion 120 of the C-shaped portion 122 of the fixed contacts 111 and 112 are external to the contact housing case 102. Therefore, the height and width of the contact storage case 102 can be reduced and the size can be reduced.
- the arc extinguishing permanent magnets 143 and 144 are arranged on the inner peripheral surface of the insulating cylinder 140 constituting the contact housing case 102 facing the side edge of the movable contact 130, the arc extinguishing permanent magnet 143 and 144 can be brought close to the contact surface between the pair of fixed contacts 111 and 112 and the movable contact 130. Therefore, it is possible to increase the magnetic flux density of the magnetic flux from the inner side to the outer side in the extending direction of the movable contact 130, and to reduce the magnetic force of the arc extinguishing permanent magnets 143 and 144 for obtaining the required magnetic flux density. The cost of the arc extinguishing magnet can be reduced.
- the distance between the side edge of the movable contact 130 and the inner peripheral surface of the insulating cylinder 140 can be increased by the thickness of the arc extinguishing permanent magnets 143 and 144, a sufficient arc extinguishing space 1456 is obtained. And 146 can be provided, and the arc can be surely extinguished.
- movable contact guide members 148 and 149 that slide in contact with the side edges of the movable contact protrude at positions facing the movable contact 130 of the magnet housing cylinders 141 and 142 that house the arc extinguishing permanent magnets 143 and 144. Since it is formed, the rotation of the movable contact 130 can be reliably prevented.
- the contact device CD according to the present invention is applied to an electromagnetic contactor has been described.
- the present invention is not limited to this, and the contact device CD is not limited to a switch, a DC relay, or the like. It can be applied to equipment.
- a contact device that can suppress an electromagnetic repulsion force that opens a movable contact during energization without enlarging the entire configuration, and an electromagnetic contactor using the contact device.
- Electromagnetic contactor 100 ... Contact Device 101 ... Contact mechanism 102 ... Contact storage case 102a ... Square tube portion 102b ... Top plate portion 111,112 ... Fixed contactor 117 ... Inner conductor plate portion 118 ... Outer conductor plate portion 119 ... L Character-shaped conductor part, 120 ... fixed conductor part, DESCRIPTION OF SYMBOLS 21 ... External connection terminal, 122 ... C-shaped part, 130 ... Movable contact, 130a ... Contact part, 131 ... Connecting shaft, 132 ... Recessed part, 134 ... Contact spring, 135 ... C-ring, 140 ...
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- Electromagnetism (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
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Abstract
Description
そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、全体の構成を大型化することなく通電時に可動接触子を開極させる電磁反発力を抑制することができる接点装置及びこれを使用した電磁接触器を提供することを目的としている。
この構成によると、固定接触子の外側導体板部に固定導体板部を連結してL字状に形成したので、固定導体板部に流れる電流とこれに接点収納ケースを挟んで対向する可動接触子との間でもローレンツ力を発生させることができる。
この構成によると、接点収納ケースが絶縁材で構成されているので、固定接触子の外側導体板部や固定導体板部の絶縁を考慮する必要がない。
また、本発明に係る接点装置の第4の態様は、前記接点収納ケースに遮断ガスが封入されている。
この構成によると、接点収納ケースに遮断ガスが封入されているので、電流遮断時に発生するアークを効率よく消弧することができる。
この構成によると、電磁接触器の通電時に可動接触子及び固定接触子間を開極させる電磁反発力に抗するローレンツ力を発生させて、可動接触子を固定接触子に接触させる接触スプリングのバネ力を小さくすることができる。これに応じて、可動接触子を駆動する電磁石の推力も小さくすることができ、小型な電磁接触器を提供することができる。
図1は本発明に係る接点装置を電磁接触器に適用した場合の一実施形態を示す断面図である。
図1において、1は例えば合成樹脂製の本体ケースである。この本体ケース1は、接点収納ケースとしての上部ケース1aと下部ケース1bの2分割構造を有する。上部ケース1aには、接点装置CDが内装されている。この接点装置CDは、上部ケース1aに固定配置された一対の固定接触子2と、この固定接触子2に接離自在に配設された可動接触子3とを備えている。
固定鉄心5の中央脚部5aにはコイルホルダ7に巻装された単相交流が供給される電磁コイル8が固定されている。また、コイルホルダ7の上面と可動鉄心6の中央脚6aの付け根との間に可動鉄心6を固定鉄心5から離れる方向に付勢する復帰スプリング9が配設されている。
そして、可動鉄心6の上端に接触子ホルダ11が連結されている。この接触子ホルダ11にはその上端側に軸直角方向に形成された挿通孔11aに、可動接触子3が接触スプリング12によって固定接触子2に対して所定の接触圧を得るように下方に押圧されて保持されている。
この可動接触子3は、図2に拡大図示するように、中央部が接触スプリング12によって押圧された可動方向と直交する方向に延長する細長い板状の導電板部3aで構成され、この導電板部3aの両端側の下面に可動接点部3b,3cがそれぞれ形成されている。
今、操作用電磁石4の電磁コイル8が非通電状態である状態では、固定鉄心5及び可動鉄心6間に電磁吸引力が生じることはなく、復帰スプリング9によって、可動鉄心6が固定鉄心5から上方に離れる方向に付勢され、この可動鉄心6の上端がストッパ13に当接することにより電流遮断位置に保持される。
しかしながら、固定接触子2は、図2に示すように、内側導体板部2c,2d及び外側導体板部2e,2fによってL字状導電板部2g,2hが形成されているので、上述した電流路が形成されることにより、可動接触子3の上側の磁束が可動接触子3のみが存在する場合に比較して外側導体板部2e,2fを流れる電流による磁束が追加されて、磁束密度が増加する。このため、フレミングの左手の法則により、可動接触子3の導電板部3aに可動接点部3b,3cを固定接点部2a,2b側に押し付ける開極方向の電磁反発力に抗するローレンツ力を作用させることができる。
この第2の実施形態では、電磁接触器自体を小型化することができる構成としたものである。
すなわち、第2の実施形態では、電磁接触器が図3に示すように構成されている。この図3において、50は電磁接触器であって、この電磁接触器50は、例えば合成樹脂製の外装絶縁容器51を有する。
外装絶縁容器51内には、接点機構を配置した接点装置100と、この接点装置100を駆動する電磁石ユニット200とが電磁石ユニット200を下部ケース52の底板上に配置した関係で収納されている。
一対の固定接触子111及び112のそれぞれは、接点収納ケース102の角筒部102aの左右側板部を貫通して固定された内側導体板部117と、この内側導体板部117の接点収納ケース102の外周面側の端部に連結されて可動接触子の離間方向に少なくとも延長する外側導体板部118とでL字状導体部119が形成されている。
したがって、一対の固定接触子111及び112は、L字状導体部119と、その外側導体板部118の上端に接続された固定導体部120とで可動接触子130の延長端部を囲むC字状に構成されている。
そして、固定接触子111及び112の内側導体板部117の内側端部が可動接触子130の延長方向端部に下側から対向する接点部117aが形成されている。
これらアーク消弧用永久磁石143及び144は、厚み方向に互いの対向磁極面がN極となるように着磁されている。また、アーク消弧用永久磁石143及び144は、左右方向の両端部がそれぞれ、図4に示すように、固定接触子111及び112の接点部117aと可動接触子130の接点部130aとの対向位置より僅かに内側となるよう設定されている。そして、磁石収納筒体141及び142の左右方向の外側にそれぞれアーク消弧空間146及び147が形成されている。
このように、アーク消弧用永久磁石143及び144を絶縁筒体140の内周面側に配置することにより、アーク消弧用永久磁石143及び144を可動接触子130に近接させることができる。このため、両アーク消弧用永久磁石143及び144のN極側から出る磁束φが、固定接触子111及び112の接点部117aと可動接触子130の接点部130aとの対向部を左右方向に内側から外側に大きな磁束密度で横切ることになる。
このスプール204は、円筒状補助ヨーク203を挿通する中央円筒部205と、この中央円筒部205の下端部から半径方向外方に突出する下フランジ部206と、中央円筒部205の上端より僅かに下側から半径方向外方に突出する上フランジ部207とで構成されている。そして、中央円筒部205、下フランジ部206及び上フランジ部207で構成される収納空間に励磁コイル208が巻装されている。
そして、スプール204の中央円筒部205内に、底部と磁気ヨーク201の底板部202との間に復帰スプリング214を配設した可動プランジャ215が上下に摺動可能に配設されている。この可動プランジャ215には、上部磁気ヨーク210から上方に突出する上端部に半径方向外方に突出する周鍔部216が形成されている。
そして、永久磁石220の上端面に、永久磁石220と同一外形で可動プランジャ215の周鍔部216の外径より小さい内径の貫通孔224を有する補助ヨーク225が固定されている。この補助ヨーク225の下面に可動プランジャ215の周鍔部216が当接されている。
また、可動プランジャ215の上端面には可動接触子130を支持する連結軸131が螺着されている。
そして、釈放状態では、可動プランジャ215が復帰スプリング214によって上方に付勢されて、周鍔部216の上面が補助ヨーク225の下面に当接する釈放位置となる。この状態で、可動接触子130の接点部130aが固定接触子111及び112の接点部117aから上方に離間して、電流遮断状態となっている。
今、外部接続端子板151が例えば大電流を供給する電力供給源に接続し、外部接続端子板152が負荷に接続されているものとする。
この状態で、電磁石ユニット200における励磁コイル208が非通電状態にあって、電磁石ユニット200で可動プランジャ215を下降させる励磁力を発生していない釈放状態にあるものとする。この釈放状態では、可動プランジャ215が復帰スプリング214によって、上部磁気ヨーク210から離れる上方向に付勢される。これと同時に、永久磁石220の磁力による吸引力が補助ヨーク225に作用されて、可動プランジャ215の周鍔部216が吸引される。このため、可動プランジャ215の周鍔部216の上面が補助ヨーク225の下面に当接している。
このように、釈放状態では、可動プランジャ215に復帰スプリング214による付勢力と環状永久磁石220による吸引力との双方が作用しているので、可動プランジャ215が外部からの振動によって不用意に下降することがなく、誤動作を確実に防止することができる。
このとき、可動プランジャ215が復帰スプリング214の付勢力及び環状永久磁石220の吸引力に抗して速やかに下降する。これにより、可動プランジャ215の下降が、周鍔部216の下面が上部磁気ヨーク210の上面に当接することにより停止される。
このため、外部電力供給源の大電流iが外部接続端子121、固定接触子111、可動接触子130、固定接触子112及び外部接続端子121を通じて負荷に供給される閉局状態となる。
このとき、固定接触子111及び112と可動接触子130との間に可動接触子130を開極させる方向の電磁反発力が発生する。
これによって、電磁石ユニット200で可動プランジャ215を下方に移動させる励磁力がなくなることにより、可動プランジャ215が復帰スプリング214の付勢力によって上昇し、周鍔部216が補助ヨーク225に近づくに従って環状永久磁石220の吸引力が増加する。
このため、固定接触子111の接点部117aと可動接触子130の接点部130aとの間では、電流Iが固定接触子111側から可動接触子130側に流れるとともに、磁束Φの向きが内側から外側に向かう方向となる。このため、フレミングの左手の法則によって、可動接触子130の長手方向と直交し且つ固定接触子111の接点部117aと可動接触子130との開閉方向と直交してアーク消弧空間145側に向かう大きなローレンツ力が作用する。
また、アーク消弧空間145では、その下方側及び上方側で、固定接触子111の接点部117a及び可動接触子130の接点部130a間の磁束の向きに対して下方側に及び上方側に磁束が傾くことになる。このため、傾いた磁束によってアーク消弧空間145に引き伸ばされたアークがアーク消弧空間145の隅の方向へさらに引き伸ばされ、アーク長を長くすることができ、良好な遮断性能を得ることができる。
また、アーク消弧空間145では、上述したように、その下方側及び上方側で、固定接触子112の接点部117a及び可動接触子130の接点部130a間の磁束の向きに対して下方側及び上方側に磁束が傾くことになる。このため、傾いた磁束によってアーク消弧空間145に引き伸ばされたアークがアーク消弧空間145の隅の方向へさらに引き伸ばされ、アーク長を長くすることができ、良好な遮断性能を得ることができる。
このとき、アーク消弧用永久磁石143及び144は絶縁筒体140に形成された磁石収納筒体141及び142内に配置されているので、アークが直接アーク消弧用永久磁石143及び144に接触することがない。このため、アーク消弧用永久磁石143及び144の磁気特性を安定して維持することができ、遮断性能を安定化させることができる。
さらに、絶縁機能、アーク消弧用永久磁石143及び144の位置決め機能及びアーク消弧用永久磁石143及び144のアークからの保護機能を1つの絶縁筒体140で行うことができるので、製造コストを低減させることができる。
このように、上記第2の実施形態によると、接点装置100では、固定接触子111及び112のC字状部122のうち外側導体板部118と固定導体部120とが接点収納ケース102の外部に配置されているので、接点収納ケース102の高さ及び幅を小さくして小型化することができる。
なお、上記実施形態においては、本発明に係る接点装置CDを電磁接触器に適用した場合について説明したが、これに限定されるものではなく、接点装置CDを開閉器、直流リレー等の任意の機器に適用することができる。
Claims (5)
- 所定距離を保って配置された一対の固定接触子と、該一対の固定接触子に対して接離可能に配置された可動接触子とを備えた接点機構を備え、
前記可動接触子は、接点収納ケース内に可動方向と交差する方向に延長する導電板部を有し、
前記一対の固定接触子のそれぞれは、一端が前記可動接触子の前記導電板部の一方の端部に対向し、他方の端部が当該導電板部と平行に前記接点収納ケースの外部に延長する内側導体板部と、該内側導体板部の前記接点収納ケースの外部の端部に連結されて前記可動接触子の離間方向に少なくとも延長する外側導体板部とで、通電時に前記固定接触子及び前記可動接触子間に発生する開極方向の電磁反発力に抗するローレンツ力を発生するL字状導体部が形成されていることを特徴とする接点装置。 - 前記外側導体板部は、前記内側導体板部に連結されて前記接点収納ケースの天板部まで延長する側板部と、該側板部の前記接点収納ケースの天板部外面に沿って延長する固定板部とでL字状に形成され、前記固定板部に接続端子が接続されていることを特徴とする請求項1に記載の接点装置。
- 前記接点収納ケースは絶縁材で構成されていることを特徴とする請求項1又は2に記載の接点装置。
- 前記接点収納ケースは遮断ガスが封入されていることを特徴とする請求項1乃至3の何れか1項に記載の接点装置。
- 前記請求項1乃至4の何れか1項に記載の接点装置を備え、前記可動接触子が操作用電磁石の可動鉄心に連結されていることを特徴とする電磁接触器。
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- 2012-10-03 KR KR1020147008799A patent/KR101890848B1/ko active IP Right Grant
- 2012-10-03 US US14/344,821 patent/US9378914B2/en not_active Expired - Fee Related
- 2012-10-03 EP EP12838528.3A patent/EP2765586B1/en not_active Not-in-force
- 2012-10-03 CN CN201280049701.3A patent/CN103875052B/zh active Active
- 2012-10-03 WO PCT/JP2012/006358 patent/WO2013051263A1/ja active Application Filing
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020039619A1 (ja) * | 2018-08-21 | 2020-02-27 | オムロン株式会社 | リレー |
JP2020030911A (ja) * | 2018-08-21 | 2020-02-27 | オムロン株式会社 | リレー |
JP7115137B2 (ja) | 2018-08-21 | 2022-08-09 | オムロン株式会社 | リレー |
US11621136B2 (en) | 2018-08-21 | 2023-04-04 | Omron Corporation | Relay |
WO2022158145A1 (ja) * | 2021-01-22 | 2022-07-28 | 富士電機機器制御株式会社 | 密閉型電磁接触器 |
Also Published As
Publication number | Publication date |
---|---|
CN103875052A (zh) | 2014-06-18 |
US20150048908A1 (en) | 2015-02-19 |
US9378914B2 (en) | 2016-06-28 |
EP2765586A1 (en) | 2014-08-13 |
KR20140074916A (ko) | 2014-06-18 |
JP2013084425A (ja) | 2013-05-09 |
JP5856426B2 (ja) | 2016-02-09 |
CN103875052B (zh) | 2017-05-10 |
EP2765586A4 (en) | 2015-07-08 |
KR101890848B1 (ko) | 2018-08-22 |
EP2765586B1 (en) | 2016-04-20 |
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