EP3113204B1 - Electromagnetic relay - Google Patents
Electromagnetic relay Download PDFInfo
- Publication number
- EP3113204B1 EP3113204B1 EP14841353.7A EP14841353A EP3113204B1 EP 3113204 B1 EP3113204 B1 EP 3113204B1 EP 14841353 A EP14841353 A EP 14841353A EP 3113204 B1 EP3113204 B1 EP 3113204B1
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- EP
- European Patent Office
- Prior art keywords
- movable
- plate
- contacts
- movable contact
- stationary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 45
- 229910052742 iron Inorganic materials 0.000 description 21
- 230000001105 regulatory effect Effects 0.000 description 17
- 210000002105 tongue Anatomy 0.000 description 11
- 238000005192 partition Methods 0.000 description 10
- 230000020169 heat generation Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
Images
Classifications
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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
- H01H50/56—Contact spring sets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
- H01H1/26—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/64—Protective enclosures, baffle plates, or screens for contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/541—Auxiliary contact devices
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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
- H01H50/642—Driving arrangements between movable part of magnetic circuit and contact intermediate part performing a rectilinear movement intermediate part being generally a slide plate, e.g. a card
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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
- H01H9/38—Auxiliary contacts on to which the arc is transferred from the main contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
- H01H2050/028—Means to improve the overall withstanding voltage, e.g. creepage distances
Definitions
- the present invention relates to an electromagnetic relay and, more particularly, to an electromagnetic relay having a twin contact structure.
- a two contact electromagnetic relay has a spring assembly 33 with a pair of divided portions extending in parallel and a pair of contact buttons 37 mounted on the divided spring portions.
- the spring assembly 33 is moved by an actuator 22 which reciprocates in response to the changes of a direction of flow of electric current applied to a coil assembly 12, making and breaking the connections between the contact buttons 37 of the spring assembly 33 and the associated contact buttons 34 mounted on the terminal 31.
- Patent Document 1 US Patent No. 7659800
- the contact buttons 37 are unlikely to make simultaneous contacts with the associated contact buttons 34 of the spring assembly 33, namely, a connection and disconnection between one contact button 37 and the associated one contact button 34 can occur earlier than that between the other contact button 37 and the associated the other contact button 34 due to variations in manufacturing and/or assembling thereof.
- the same problem occurs due to the repetition of the connection and disconnection over a long period of time. This may result in an unwanted adhesion of wearing particles generated at the previously connected and disconnected contact buttons to the subsequently connected and disconnected contact buttons, increasing contact resistance and the resultant heat generation of the subsequently connected and disconnected contact buttons.
- the document " EP 0 286 432 A2" discloses an electromagnetic relay according to the preamble of claim 1.
- an object of the invention is to provide an electromagnetic relay capable of preventing the heat generation due to the wearing particles which can cause at the connection and disconnection of the contacts.
- an electromagnetic relay for reciprocatingly moving an actuator plate by electrically energizing an electromagnetic unit, causing a plurality of neighboring movable contacts to make and break contacts with a plurality of neighboring stationary contacts opposing the movable contacts, comprising a shield plate provided between one pair of the opposing movable and stationary contacts and the other pair of opposing movable and stationary contacts.
- the shield plate prevents the wearing particles generated by the connection and disconnection of one pair of movable and stationary contacts from scattering and adhering to the other pair of movable and stationary contacts, which in turn prevents an increase of contact resistance and a resultant heat generation.
- the electromagnetic relay comprises a movable contact plate which is divided at one end thereof into two pieces, wherein the movable contacts are mounted on the divided pieces.
- the shield plate is disposed in a first slit formed between the divided pieces. According to this aspect of the invention, the shield plate prevents the wearing particles from scattering and adhering to the movable and stationary contacts, which in turn prevents an increase of contact resistance and a resultant heat generation.
- one of the movable contacts may be used as an opening/closing movable contact which makes contacts with one of the stationary contacts
- the other movable contact may be used as a conducting movable contact which makes contacts with the other stationary contact, the contacts of the opening/closing movable contact with the one stationary contact being made earlier than the contacts of the conducting movable contact with the other stationary contact.
- the shield plate prevents the wearing particles generated by the connection and disconnection of the opening/closing movable contact from scattering and adhering to the conducting movable and stationary contacts, which in turn prevents an increase of contact resistance and a resultant heat generation of the conducting movable and stationary contacts.
- the electromagnetic relay comprises a stationary contact terminal supporting the opening/closing stationary contact and the conducting stationary contact, the stationary contact terminal having a second slit partitioning the opening/closing stationary contact and the conducting stationary contact.
- the shield plate can be positioned in a precise manner between the opening/closing and conducting stationary contacts, which reliably prevents the wearing particles from scattering and adhering to the contacts, which in turn prevents an increase of contact resistance and a resultant heat generation of the contacts.
- the shield plate may be inserted through an insertion hole of a housing accommodating the stationary contacts.
- the shield plate can be mounted to the housing through the insertion hole, easing the assembling of the relay.
- the shield plate may be formed integrally with the actuator plate.
- the number of components and the assembling processes are reduced, which eventually increases the productivity of the relay.
- the shield plate may be formed of an insulating material.
- the insulating property increases significantly.
- At least one of surfaces of the shield plate opposing the opening/closing movable contact has convex and concave portions formed therein.
- an increase of the surface area of the shield plate allows the plate to catch a large amount of generated wearing particles, which considerably increases the insulating distance and the insulating property.
- the convex and concave portions are a plurality of parallel grooves.
- the generated wearing particles can be caught by the grooves, which prevents the wearing particles from scattering and adhering for a long time and increases the insulating property.
- the electromagnetic relay generally includes a base 10, an electromagnetic unit 20, a stationary contact terminal 30, a movable contact terminal 40, a movable contact plate assembly 50 securely fixed to the movable contact terminal 40, a rotatable actuator 60, an actuator plate 70, a position regulating plate 80, and a cover 90.
- the base 10 which is shaped in the form of rectangular box, has a partition wall 11 protruding from a bottom surface thereof and an engagement recess 11a formed on an upper portion of an inwardly-faced surface of the partition wall 11 as shown in Fig. 2 . Also, the base 10 has a pair of terminal slits 12a and 12b formed on peripheral walls partially defining one of internal spaces partitioned by the partition wall 11. A press fitting groove 13 for press fitting one end of the movable contact terminal 40 which will be described below is formed in one of the internal spaces.
- the base 10 is provided with a positioning projection 14 and a positioning rib (not shown) for positioning the electromagnetic unit 20 which will be described below, in the other internal space separated from the one internal space by the partition wall 11.
- the positioning projection 14 and the positioning rib have positioning holes 14a provided on upper end surfaces thereof, respectively.
- the base 10 has mounting holes 16 provided at diagonally opposing corners thereof and has engaging projections 17 provided on respective outer peripheral surfaces of the base 10.
- the base has an insertion hole 18 defined in a peripheral side wall adjacent the peripheral side walls having terminal slits 12a and 12b defined therein, so that an insulating shield plate 85 described below can be inserted in the insertion hole 18 ( Fig. 3 ).
- the electromagnetic unit 20 has a spool 21 with flanges 21a and 21b provided on opposite sides thereof, an iron core 23 inserted in a through-hole defined in the spool 21, a coil wound around the spool 21, and substantially L-shaped yokes 24 and 25 fixed to the opposite ends of the iron core 23 protruding from the spool 21.
- Three coil terminals 26a, 26b, and 26c are press fitted in an edge portion of the flange 21b.
- the electromagnetic unit 20 is assembled in the base 10 as it is positioned by the partition wall 11, the positioning projection 14 and the positioning rib (not shown).
- the stationary contact terminal 30 has an opening/closing stationary contact 31 and a conducting stationary contact 32 fixed to one end thereof. The other end thereof is served as a terminal portion 33.
- the opening/closing stationary contact 31 is made of a metallic material with a high conductivity such as silver.
- the opening/closing stationary contact 31 and the conducting stationary contact 32 are configured so that a height of opening/closing stationary contact 31 from the stationary contact terminal 30 is greater than that of the conducting stationary contact 32.
- the opening/closing stationary contact 31 has a greater diameter than the conducting stationary contact 32. A thickness of a silver material covering a surface of the opening/closing stationary contact 31 is greater than that of the conducting stationary contact 32.
- the stationary contact terminal 30 has a second slit 34 defined between the opening/closing and conducting stationary contacts 31 and 32.
- the movable contact plate assembly 50 is fixed to the movable contact terminal 40 through a fixing projection 41 provided on one end thereof ( Fig. 6B ). The other end thereof is served as a terminal portion 42.
- the movable contact terminal 40 has a third slit 43 defined in a line extending along a lower edge of the terminal portion 42.
- the movable contact plate assembly 50 has stacked, first, second, third and fourth movable contact plates 51, 52, 53 and 54 of which one ends are fixed to the fixing projection 41 of the movable contact terminal 40.
- an opening/closing movable contact 57 and a conducting movable contact 58 are fixed to the distal ends of first and second divided plate portions 55 and 56 divided to extend in parallel in its longitudinal direction, respectively, as shown in Fig. 4 .
- the opening/closing movable contact 57 is formed by a metallic material with a high conductivity such as silver.
- the opening/closing movable contact 57 and the conducting movable contact 58 are configured so that a height of opening/closing movable contact 57 from the movable contact plate assembly 50 is greater than that of the conducting movable contact 58.
- the opening/closing movable contact 57 has a greater diameter than the conducting movable contact 58.
- a thickness of a silver material covering a surface of the opening/closing movable contact 57 is greater than that of the conducting movable contact 58.
- first and second divided plate portions 55 and 56 have fold portions 55a and 56a formed at proximal portions thereof to have a substantially U-shaped configuration.
- the movable contact plate assembly 50 has a cutout 50b formed at a corner of the proximal end thereof.
- the present invention is not restricted to the above embodiment.
- at least one of the opening/closing stationary contact 31 and the opening/closing movable contact 57 may have a greater height than the conducting stationary contact 32 and the conducting movable contact 58.
- the opening/closing stationary and movable contacts 31 and 57 have the same configuration. Also, the conducting stationary and movable contacts 32 and 58 have the same configuration.
- the movable contact plate assembly 50 may be formed by at least two movable contact plates.
- the first movable contact plate 51 has two pieces 51a and 51b divided to extend in parallel in its longitudinal direction.
- the divided plates 51a and 51b have substantially U-shaped fold portions 51c formed at proximal portions thereof.
- the first movable contact plate 51 has a plurality of fixing holes 51d arranged in parallel on the proximal end and a cutout 51e formed at the proximal end corner thereof.
- the divided plates 51a and 51b have a semicircular aperture 51f provided adjacent at distal ends thereof and around a portion in which the opening/closing movable contact 57 and the conducting movable contact 58 are provided. Aplate portion outside the aperture 51f is bent to form an elastically deformable bent portion 51g.
- the substantially U-shaped aperture 51f is provided to surround the region in which the opening/closing movable contact 57 and the conducting movable contact 58 are disposed, and the plate portion outside of the aperture 51f is bent to form the elastically deformable bent portion 51g. This allows a contact pressure to be controlled by adjusting a shape and size of the aperture 51f and an angle of the bent portion 51g.
- the aperture 51f is not limited to be semicircular, and it may be made of at least one straight line.
- the second movable contact plate 52 has two pieces 52a and 52b divided to extend in parallel in its longitudinal direction.
- the divided plates 52a and 52b have substantially U-shaped fold portions 52c formed at proximal portions thereof.
- the second movable contact plate 52 has a plurality of fixing holes 52d arranged in parallel on the proximal end and a cutout 52e formed at the proximal end corner thereof.
- the third movable contact plate 53 has two pieces 53a and 53b divided to extend in parallel in its longitudinal direction.
- the divided plates 53a and 53b have substantially U-shaped fold portions 53c formed at proximal portions thereof.
- the second movable contact plate 53 has a plurality of fixing holes 53d arranged in parallel on the proximal end and a cutout 53e formed at the proximal end corner thereof.
- the second movable contact plate 54 has two pieces 54a and 54b extending in parallel in its longitudinal direction.
- the divided plates 54a and 54b have substantially U-shaped fold portions 54c formed at proximal portions thereof.
- the second movable contact plate 54 has a plurality of fixing holes 54d arranged in parallel on the proximal end and a cutout 54e formed at the proximal end corner thereof. Press-fitting projections 54f are formed by stamping at the proximal end of the plate 54.
- Upper and lower distal end portions of the divided plate 54a are bent in a direction to form a pair of upper and lower position regulating tongues 54g and 54g for engagement with an arm 72 of an actuator plate 70 described below.
- a distal end of the divided plate 54b is bent in a direction to form a pair of upper and lower position regulating tongues 54h for engagement with the arm 72 of the actuator plate 70 described below.
- One of the position regulating tongue 54h is bent at opposite ends to form positioning ribs 54i for the positioning of the arm 72 in the widthwise direction of the tongue.
- the movable contact terminal 40 with the movable contact plate assembly 50 fixed thereto is press fitted into the press fitting groove 13 of the base 10.
- the lower end of the movable contact terminal 40 is inserted in the press fitting groove 13 of the base 10 from above.
- a thickness of the lower end of the movable contact terminal 40 including the fixing projection 41 is smaller than a width of the press fitting groove 13, ensuring a smooth assembling without causing any scraping debris. Also, because of the cutout 50b provided at one side corner of the movable contact plate assembly 50, a press fitting can be performed more easily.
- a substantial resistive force is obtained at the insertion of the lower end of the movable contact terminal 40 into the press fitting groove 13 because a thickness of the movable contact terminal 40 including the press fitting projection 54f is greater than or equal to the width of the press fitting groove 13.
- a further pressing of the movable contact terminal 40 into the press fitting groove 13 causes the lower edge of the movable contact terminal to be forcedly engaged with the stepped portion (not shown) formed on the inside surface of the press fitting groove 13 and thereby held immovably.
- the present invention is not limited thereto.
- at least one press fitting projection 54f may be sufficient.
- two press fitting projections 54f may be provided on upper and lower ends of the fourth movable contact plate 54, namely, four fitting projections may be provided in total.
- the rotatable actuator 60 has first and second iron plates 61 and 62 integrally assembled therewith and holding a permanent magnet therebetween.
- the actuator 60 further has rotating shafts 63 and 64 protruding coaxially from the upper and lower surfaces and an operation arm 65 protruding from a side surface thereof.
- the actuator 60 is mounted in the base 10 with the rotating shaft 63 inserted in the bearing recess (not shown) formed in the bottom surface of the base 10 so that one ends of the first and second iron plates 61 and 62 move to the magnetic poles 24a and 25a and the other ends of the first and second iron plates 61 and 62 move away from the magnetic poles 24a and 25a, and vice versa, alternately ( Fig. 8 ).
- the actuator plate 70 has an engaging hole 71 formed on one end thereof.
- the rectangular engaging hole 71 is configured to engage with the operation arm 65 of the rotatable actuator 60.
- the actuator plate 70 further has an upwardly extending engaging arm 72 integrally formed therewith on the other end thereof to define an engaging slot 73 therebetween.
- the engaging arm 72 has two positioning projections 74 formed at lower side thereof.
- the operation arm 65 of the rotatable actuator 60 is engaged in the engaging hole 71 of the actuator plate 70.
- the distal end of the movable contact plate assembly 50 is engaged in the engaging slot 73.
- the engaging arm 72 is engaged with the position regulating tongues 54g of the divided plate 54a of the fourth movable contact plate 54 and the position regulating tongues 54h of the divided plate 54b.
- position regulating rib 54i of the position regulating tongue 54h are positioned between the pair of position regulating projections 74 of the engaging arm 72, preventing a displacement of the movable contact plate assembly 50 in a vertical or widthwise direction thereof, which ensures a reliable operating characteristic of the electromagnetic relay.
- the position regulating plate 80 has a planar configuration to extend between the positioning projection 14 and the positioning rib (not shown) .
- the plate 80 has positioning projections 81 and 82 provided at opposite ends of its lower surface, which are configured so that they can fit in the positioning holes 14a and 15a of the positioning projection 14 and the positioning rib (not shown), respectively.
- the plate 80 further has a through hole 83 provided on a central portion thereof so that the rotation shaft 64 of the rotatable actuator 60 can be engaged in the hole.
- the insulating shield plate 85 is configured so that it can be inserted from the insertion hole 18 of the base 10 and has a position regulating rib 86 formed integrally at one end thereof. As shown in Fig. 6B , the insulating shield plate 85 is inserted into the insertion hole 18 of the base 10 so that it extends through the second slit 34 of the stationary contact terminal 30 and the first slit 50a of the movable contact plate assembly 50 to reach the third slit 43 of the movable contact terminal 40.
- the insulating shield plate 85 is positioned in the second slit 34, the first slit 50a and the third slit 43 to partition between the opening/closing stationary and movable contacts 31, 57 and the conducting stationary and movable contacts 32, 58.
- the insulating shield plate 85 has a plurality of grooves 87 formed in parallel on a surface opposing at least the opening/closing stationary contact 31 and the opening/closing movable contact 57, increasing its surface area and its insulating property.
- a cover 90 takes a planar configuration such that it covers the opening of the base 10 and has at respective diagonally opposing corners thereof cylindrical connecting portions 91 formed with through-holes 91a.
- the cover 90 has elastic engaging portion 92s formed in respective positions of the outer peripheral edges, corresponding to the engaging projections 17 of the base 10.
- the cover 90 has a projection 93 formed on a ceiling thereof which engages with the corresponding engagement recess 11a of the partition wall 11 of the base 10.
- the cover 90 is mounted from above on the base 10 supporting the above described components already mounted thereon.
- the cylinder portions 91 of the cover 90 are engaged in the holes 16 on the base 10, and the elastic engaging portions 92 of the cover 90 are engaged with the engaging projection 17 of the base 10, which completes the assembling of the base and the cover.
- the larger diameter opening/closing movable contact 57 is disposed adjacent the opening of the base 10, which advantageously ensures a reliable inspection and adjustment at the assembling and an enhanced productivity of the relay.
- Figs. 8A and 8B show the electromagnetic relay in operation. The descriptions about its operation will start from the condition in which one end 61a of the first movable iron plate 61 and the other end 62b of the second movable iron plate 62 are magnetically attracted to the magnetic poles 24a and 25a of the yokes 24 and 25 by a magnetic force of the permanent magnet, respectively.
- the rotatable actuator 60 rotates against the magnetic force of the permanent magnet, causing that one end 61a of the first movable iron plate 61 and the other end 62b of the second movable iron plate 62 are disconnected from the magnetic poles 24a and 25a of the yokes 24 and 25 and the other end 61b of the first movable iron plate 61 and one end 62a of the second movable iron plate 62 attract the magnetic poles 25a and 24a of the yokes 25 and 24, respectively.
- the operation arm 65 of the rotated rotatable actuator 60 slidingly moves the actuator plate 70 so that the inside surface of the engaging slot 73 of the actuator plate 70 simultaneously forces the bent portions 51g of the first movable contact plate 51.
- This in turn causes that the opening/closing movable contact 57 and the conducting movable contact 58 move around fixing projections 41 where the movable contact plates are fixed to the movable contact terminal 40.
- the opening/closing movable contact 57 makes a contact with the opening/closing stationary contact 31 ( Fig. 6B ) and then the conducting movable contact 58 comes in contact with the conducting stationary contact 32.
- the actuator plate 70 forces the bent portions 51g of the movable contact plate assembly 50.
- the bent portion 51g of the divided plate 51b with the conducting movable contact 58 is shorter than and has a greater spring constant than the bent portion 51g of the dividedplate 51a. This ensures that, even a small amount of movement of the conducting movable contact 58 relative to the opening/closing movable contact 57 eventually allows the opening/closing movable contact 57 and the conducting movable contact 58 to contact the opening/closing stationary contact 31 and the conducting stationary contact 32 with a uniform contact pressure, respectively.
- the rotatable actuator 60 rotates in the opposite direction, causing the operation arm 65 to move the actuator plate 70 and also the engaging arm 72 of the actuator plate 70 to move the distal end of the movable contact plate assembly 50 back into their original positions, respectively.
- the relay is unlikely to be damaged by arcing which may occur between the opening/closing movable contact 57 and the opening/closing stationary contact 31. Also, the arcing is less-likely to occur between the conducting movable contact 58 and the conducting stationary contact 32.
- this prevents shortening of the contact life which would otherwise be caused by the contact wear and ensures a reliable conducting characteristic in the relay.
- the insulating shield plate 85 partitions the opening/closing movable and stationary contacts 57, 31 and the conducting stationary and movable contact 32, 58. Then, even if the arcing occurs between the opening/closing movable contact 57 and the opening/closing stationary contact 31, the arcing particles do not adhere to the conducting stationary contact 32 or the conducting movable contact 58 which would otherwise cause an increase of the contact resistance and heating thereof.
- the distal end portion of the insulating shield plate 85 is inserted to reach the third slit 43 of the movable contact terminal 40 and the insulating shield plate 85 is supported at opposite ends, which results in various advantages that the positioning precision increases and it is unlikely to drop off.
- the electromagnetic relay according to the second embodiment is substantially the same as the first embodiment, as shown in Figs. 9A to 16B , except that the insulating shield plate 85 is integrally formed with the actuator plate 70, which reduces the number of components and/or the manufacturing processes and thereby increases the productivity of the relay. It should be noted that, since the insulating shield plate 85 is integrally formed with the actuator plate 70, no insertion hole needs to be made in the base 10.
- the actuator plate 70 has a pair of engaging arms 75 and 76 formed at one end thereof so that they protrude laterally in parallel to form engaging slots 73 therebetween.
- the engaging slots 73 are configured so that the first and second divided plate portions 55 and 56 of the movable contact plate assembly 50 can engage.
- the insulating shield plate 85 has a plurality of parallel grooves 87 formed on at least one of its front and rear surfaces of the insertion portion, opposing the opening/closing stationary contact 31, to increase a surface area and then the insulating property thereof.
- the stationary contact terminal 30, movable contact terminal 40 and movable contact plate assembly 50 have a second slit 34, third slit 43 and first slit 50a, respectively, for insertion of the insulating shield plate 85 in the same manner as in the first embodiment.
- the movable contact terminal 40 has a through hole 44 for insertion of the actuator plate 70 which will be described below, increasing a greater mechanical strength of the movable contact terminal 40 than the first embodiment.
- the movable contact plate assembly 50 is substantially the same as that in the first embodiment as shown in Fig. 12 , except that the distal end of one divided plate 54a has at its distal end a pair of position regulating tongues 54g by bending it in the same direction so as to engage upper and lower portions of the engaging arm 75 and the distal end of the other divided plate 54b has at its distal end a pair of position regulating tongues 54h by bending it in the same direction so as to engage upper and lower portions of the engaging arm 75.
- Figs. 16A and 16B show the electromagnetic relay in operation. The descriptions about its operation will start from the condition in which one end 61a of the first movable iron plate 61 and the other end 62b of the second movable iron plate 62 are magnetically attracted to the magnetic poles 24a and 25a of the yokes 24 and 25 by a magnetic force of the permanent magnet, respectively.
- the rotatable actuator 60 rotates against the magnetic force of the permanent magnet, causing that one end 61a of the first movable iron plate 61 and the other end 62b of the second movable iron plate 62 are disconnected from the magnetic poles 24a and 25a of the yokes 24 and 25 and the other end 61b of the first movable iron plate 61 and one end 62a of the second movable iron plate 62 attract the magnetic poles 25a and 24a of the yokes 25 and 24, respectively.
- the operation arm 65 of the rotated rotatable actuator 60 slidingly moves the actuator plate 70 so that the inside surface of the engaging slot 73 of the actuator plate 70 simultaneously forces the bent portions 51g of the first movable contact plate 51.
- This in turn causes that the opening/closing movable contact 57 and the conducting movable contact 58 move around fixing projections 41 where the movable contact plates are fixed to the movable contact terminal 40.
- the opening/closing movable contact 57 makes a contact with the opening/closing stationary contact 31 ( Fig. 16B ) and then the conducting movable contact 58 comes in contact with the conducting stationary contact 32.
- the actuator plate 70 forces the bent portions 51g of the movable contact plate assembly 50. This causes that the opening/closing movable contact 57 and the conducting movable contact 58 make contacts with the opening/closing stationary contact 31 and the conducting stationary contact 32, respectively.
- the rotatable actuator 60 rotates in the opposite direction, causing the operation arm 65 to move the actuator plate 70 and also the engaging arm 72 of the actuator plate 70 to move the distal end of the movable contact plate assembly 50 back into their original positions, respectively.
- the relay is unlikely to be damaged by arcing which may occur between the opening/closing movable contact 57 and the opening/closing stationary contact 31. Also, the arcing is less-likely to occur between the conducting movable contact 58 and the conducting stationary contact 32.
- this prevents shortening of the contact life which would otherwise be caused by the contact wear and ensures a reliable conducting characteristic in the relay.
- the insulating shield plate 85 partitions the opening/closing movable and stationary contacts 57, 31 and the conducting stationary and movable contacts 32, 58. Then, even if the arcing occurs between the opening/closing movable contact 57 and the opening/closing stationary contact 31, the arcing particles do not adhere to the conducting stationary contact 32 or the conducting movable contact 58 which would otherwise cause an increase of the contact resistance and heating thereof.
- the electromagnetic relay according to the invention is not limited to that described above, and the invention can be applied to various electromagnetic relays and electronic devices.
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- Relay Circuits (AREA)
- Manufacture Of Switches (AREA)
- Switches With Compound Operations (AREA)
Description
- The present invention relates to an electromagnetic relay and, more particularly, to an electromagnetic relay having a twin contact structure.
- Conventionally, there has been disclosed in, for example, a patent document 1 a two contact electromagnetic relay. The relay has a
spring assembly 33 with a pair of divided portions extending in parallel and a pair of contact buttons 37 mounted on the divided spring portions. In this relay, thespring assembly 33 is moved by an actuator 22 which reciprocates in response to the changes of a direction of flow of electric current applied to a coil assembly 12, making and breaking the connections between the contact buttons 37 of thespring assembly 33 and the associatedcontact buttons 34 mounted on theterminal 31. - Patent Document 1:
US Patent No. 7659800 - In the electromagnetic relay, the contact buttons 37 are unlikely to make simultaneous contacts with the associated
contact buttons 34 of thespring assembly 33, namely, a connection and disconnection between one contact button 37 and the associated onecontact button 34 can occur earlier than that between the other contact button 37 and the associated theother contact button 34 due to variations in manufacturing and/or assembling thereof. The same problem occurs due to the repetition of the connection and disconnection over a long period of time. This may result in an unwanted adhesion of wearing particles generated at the previously connected and disconnected contact buttons to the subsequently connected and disconnected contact buttons, increasing contact resistance and the resultant heat generation of the subsequently connected and disconnected contact buttons. The document "EP 0 286 432 A2 - Considering the above described drawbacks, an object of the invention is to provide an electromagnetic relay capable of preventing the heat generation due to the wearing particles which can cause at the connection and disconnection of the contacts.
- This object is achieved by the subject-matter of the independent claim 1. Further advantageous embodiments are the subject-matter of the dependent claims. Aspects of the invention are set out below.
- According to the present invention, an electromagnetic relay for reciprocatingly moving an actuator plate by electrically energizing an electromagnetic unit is provided, causing a plurality of neighboring movable contacts to make and break contacts with a plurality of neighboring stationary contacts opposing the movable contacts, comprising a shield plate provided between one pair of the opposing movable and stationary contacts and the other pair of opposing movable and stationary contacts.
- According to the invention, the shield plate prevents the wearing particles generated by the connection and disconnection of one pair of movable and stationary contacts from scattering and adhering to the other pair of movable and stationary contacts, which in turn prevents
an increase of contact resistance and a resultant heat generation. - In the invention, the electromagnetic relay comprises a movable contact plate which is divided at one end thereof into two pieces, wherein the movable contacts are mounted on the divided pieces. In particular, the shield plate is disposed in a first slit formed between the divided pieces. According to this aspect of the invention, the shield plate prevents the wearing particles from scattering and adhering to
the movable and stationary contacts, which in turn prevents an increase of contact resistance and a resultant heat generation. - In a preferred aspect of the invention, one of the movable contacts may be used as an opening/closing movable contact which makes contacts with one of the stationary contacts, and the other movable contact may be used as a conducting movable contact which makes contacts with the other stationary contact, the contacts of the opening/closing movable contact with the one stationary contact being made earlier than the contacts of the conducting movable contact with the other stationary contact.
- According to this preferred aspect of the invention, the shield plate prevents the wearing particles generated by the connection and disconnection of the opening/closing movable contact from scattering and adhering to the conducting movable and stationary contacts, which in turn prevents an increase of contact resistance and a resultant heat generation of the conducting movable and stationary contacts.
- In the invention, the electromagnetic relay comprises a stationary contact terminal supporting the opening/closing stationary contact and the conducting stationary contact, the stationary contact terminal having a second slit partitioning the opening/closing stationary contact and the conducting stationary contact.
- According to this aspect of the invention, the shield plate can be positioned in a precise manner between the opening/closing and conducting stationary contacts, which reliably prevents the wearing particles from scattering and adhering to the contacts, which in turn prevents an increase of contact resistance and a resultant heat generation of the contacts.
- In a preferred aspect of the invention, the shield plate may be inserted through an insertion hole of a housing accommodating the stationary contacts.
- According to this preferred aspect of the invention, the shield plate can be mounted to the housing through the insertion hole, easing the assembling of the relay.
- In another preferred aspect of the invention, the shield plate may be formed integrally with the actuator plate.
- According to this aspect of the invention, the number of components and the assembling processes are reduced, which eventually increases the productivity of the relay.
- In another preferred aspect of the invention, the shield plate may be formed of an insulating material.
- According to this aspect of the invention, the insulating property increases significantly.
- In the invention, at least one of surfaces of the shield plate opposing the opening/closing movable contact has convex and concave portions formed therein.
- According to this aspect of the invention, an increase of the surface area of the shield plate allows the plate to catch a large amount of generated wearing particles, which considerably increases the insulating distance and the insulating property.
- In the invention, the convex and concave portions are a plurality of parallel grooves.
- According to this aspect of the invention, the generated wearing particles can be caught by the grooves, which prevents the wearing particles from scattering and adhering for a long time and increases the insulating property.
-
-
Figs. 1A and 1B are a perspective view showing a first embodiment of an electromagnetic relay according to the present invention and a perspective view showing a state in which a cover is removed. -
Fig. 2 is an exploded perspective view showing the electromagnetic relay illustrated inFig. 1A . -
Fig. 3 is an exploded perspective view showing the electromagnetic relay illustrated inFig. 1A as seen at a different angle. -
Figs. 4A and 4B are exploded perspective views showing a movable contact terminal and a movable contact plate assembly illustrated inFig. 2 . -
Figs. 5A and 5B are perspective views showing only a contact mechanism illustrated inFig. 1B as seen at a different angle. -
Fig. 6A is a front view showing the contact mechanism illustrated inFig. 5 ,Fig. 6B is a partial sectional view taken along B - B lines ofFig. 6A, and Fig. 6C is a partial bottom view showing the portion inFIG. 6A . -
Fig. 7A is a perspective view showing an insulating shield plate andFig. 7B is a view showing a variant of the insulating shield plate. -
Fig. 8A is a partial plan view showing a state in the middle of an operation andFig. 8B is a schematic partial plan view showing the portion ofFig. 8A . -
Figs. 9A and 9B are a perspective view showing a second embodiment of an electromagnetic relay according to the present invention and a perspective view showing a state in which a cover is removed. -
Fig. 10 is an exploded perspective view showing the electromagnetic relay illustrated inFig. 9A . -
Fig. 11 is an exploded perspective view showing the electromagnetic relay illustrated inFig. 9A as seen at a different angle. -
Figs. 12A and 12B are exploded perspective views showing a movable contact terminal and a movable contact plate assembly illustrated inFig. 10 . -
Figs. 13A and 13B are perspective views showing only a contact mechanism illustrated inFig. 9B as seen at a different angle. -
Fig. 14A is a front view showing the contact mechanism illustrated inFig. 13 ,Fig. 14B is a partial sectional view taken along B - B lines ofFig. 14A, and Fig. 14C is a partial bottom view showing the portion inFIG. 14A . -
Fig. 15A is a perspective view showing an actuator plate including an insulating shield plate andFig. 15B is a view showing a variant of the actuator plate. -
Fig. 16A is a partial plan view showing a state in the middle of an operation andFig. 16B is a schematic partial plan view showing the portion ofFig. 16A . - With reference to
Figs. 1A-16B , various embodiments of an electromagnetic relay according to the present invention will be described. - As shown in
Figs. 1A to 8B , the electromagnetic relay according to the embodiment of the present invention generally includes abase 10, an electromagnetic unit 20, astationary contact terminal 30, amovable contact terminal 40, a movablecontact plate assembly 50 securely fixed to themovable contact terminal 40, arotatable actuator 60, anactuator plate 70, aposition regulating plate 80, and acover 90. - The
base 10, which is shaped in the form of rectangular box, has apartition wall 11 protruding from a bottom surface thereof and anengagement recess 11a formed on an upper portion of an inwardly-faced surface of thepartition wall 11 as shown inFig. 2 . Also, thebase 10 has a pair ofterminal slits partition wall 11. Apress fitting groove 13 for press fitting one end of themovable contact terminal 40 which will be described below is formed in one of the internal spaces. Thebase 10 is provided with apositioning projection 14 and a positioning rib (not shown) for positioning the electromagnetic unit 20 which will be described below, in the other internal space separated from the one internal space by thepartition wall 11. Thepositioning projection 14 and the positioning rib havepositioning holes 14a provided on upper end surfaces thereof, respectively. In addition, thebase 10 has mountingholes 16 provided at diagonally opposing corners thereof and has engagingprojections 17 provided on respective outer peripheral surfaces of thebase 10. The base has aninsertion hole 18 defined in a peripheral side wall adjacent the peripheral side walls havingterminal slits shield plate 85 described below can be inserted in the insertion hole 18 (Fig. 3 ). - As shown in
Figs. 2 and3 , the electromagnetic unit 20 has aspool 21 withflanges iron core 23 inserted in a through-hole defined in thespool 21, a coil wound around thespool 21, and substantially L-shapedyokes iron core 23 protruding from thespool 21. Threecoil terminals flange 21b. As shown inFig. 2 , the electromagnetic unit 20 is assembled in the base 10 as it is positioned by thepartition wall 11, thepositioning projection 14 and the positioning rib (not shown). - As shown in
Fig. 2 , thestationary contact terminal 30 has an opening/closingstationary contact 31 and a conductingstationary contact 32 fixed to one end thereof. The other end thereof is served as aterminal portion 33. The opening/closingstationary contact 31 is made of a metallic material with a high conductivity such as silver. The opening/closingstationary contact 31 and the conductingstationary contact 32 are configured so that a height of opening/closingstationary contact 31 from thestationary contact terminal 30 is greater than that of the conductingstationary contact 32. Also, the opening/closingstationary contact 31 has a greater diameter than the conductingstationary contact 32. A thickness of a silver material covering a surface of the opening/closingstationary contact 31 is greater than that of the conductingstationary contact 32. Thestationary contact terminal 30 has asecond slit 34 defined between the opening/closing and conductingstationary contacts - One end of the movable
contact plate assembly 50 is fixed to themovable contact terminal 40 through a fixingprojection 41 provided on one end thereof (Fig. 6B ). The other end thereof is served as aterminal portion 42. Themovable contact terminal 40 has athird slit 43 defined in a line extending along a lower edge of theterminal portion 42. - As shown in
Fig.4 , the movablecontact plate assembly 50 has stacked, first, second, third and fourthmovable contact plates projection 41 of themovable contact terminal 40. In the movablecontact plate assembly 50, as shown inFig. 3 , an opening/closingmovable contact 57 and a conductingmovable contact 58 are fixed to the distal ends of first and second dividedplate portions Fig. 4 . - The opening/closing
movable contact 57 is formed by a metallic material with a high conductivity such as silver. The opening/closingmovable contact 57 and the conductingmovable contact 58 are configured so that a height of opening/closingmovable contact 57 from the movablecontact plate assembly 50 is greater than that of the conductingmovable contact 58. Also, the opening/closingmovable contact 57 has a greater diameter than the conductingmovable contact 58. A thickness of a silver material covering a surface of the opening/closingmovable contact 57 is greater than that of the conductingmovable contact 58. Furthermore, the first and second dividedplate portions fold portions contact plate assembly 50 has acutout 50b formed at a corner of the proximal end thereof. - Although the descriptions have been made to the embodiment in which the opening/closing
stationary contact 31 and the opening/closingmovable contact 57 have greater heights than the conductingstationary contact 32 and the conductingmovable contact 58, respectively, the present invention is not restricted to the above embodiment. For example, at least one of the opening/closingstationary contact 31 and the opening/closingmovable contact 57 may have a greater height than the conductingstationary contact 32 and the conductingmovable contact 58. - The opening/closing stationary and
movable contacts movable contacts - Of course, the movable
contact plate assembly 50 may be formed by at least two movable contact plates. - As shown in
Fig. 4 , the firstmovable contact plate 51 has twopieces plates U-shaped fold portions 51c formed at proximal portions thereof. Also, the firstmovable contact plate 51 has a plurality of fixingholes 51d arranged in parallel on the proximal end and acutout 51e formed at the proximal end corner thereof. The dividedplates semicircular aperture 51f provided adjacent at distal ends thereof and around a portion in which the opening/closingmovable contact 57 and the conductingmovable contact 58 are provided. Aplate portion outside theaperture 51f is bent to form an elastically deformablebent portion 51g. - According to this embodiment, the substantially
U-shaped aperture 51f is provided to surround the region in which the opening/closingmovable contact 57 and the conductingmovable contact 58 are disposed, and the plate portion outside of theaperture 51f is bent to form the elastically deformablebent portion 51g. This allows a contact pressure to be controlled by adjusting a shape and size of theaperture 51f and an angle of thebent portion 51g. - The
aperture 51f is not limited to be semicircular, and it may be made of at least one straight line. - As shown in
Fig. 4 , the secondmovable contact plate 52 has twopieces plates U-shaped fold portions 52c formed at proximal portions thereof. Also, the secondmovable contact plate 52 has a plurality of fixingholes 52d arranged in parallel on the proximal end and acutout 52e formed at the proximal end corner thereof. - As shown in
Fig. 4 , the thirdmovable contact plate 53 has twopieces plates U-shaped fold portions 53c formed at proximal portions thereof. Also, the secondmovable contact plate 53 has a plurality of fixingholes 53d arranged in parallel on the proximal end and acutout 53e formed at the proximal end corner thereof. - As shown in
Figs. 6A and 6B , the secondmovable contact plate 54 has twopieces plates U-shaped fold portions 54c formed at proximal portions thereof. Also, the secondmovable contact plate 54 has a plurality of fixingholes 54d arranged in parallel on the proximal end and acutout 54e formed at the proximal end corner thereof. Press-fitting projections 54f are formed by stamping at the proximal end of theplate 54. - Upper and lower distal end portions of the divided
plate 54a are bent in a direction to form a pair of upper and lowerposition regulating tongues arm 72 of anactuator plate 70 described below. - Likerwise, a distal end of the divided
plate 54b is bent in a direction to form a pair of upper and lowerposition regulating tongues 54h for engagement with thearm 72 of theactuator plate 70 described below. One of theposition regulating tongue 54h is bent at opposite ends to form positioning ribs 54i for the positioning of thearm 72 in the widthwise direction of the tongue. - The
movable contact terminal 40 with the movablecontact plate assembly 50 fixed thereto is press fitted into thepress fitting groove 13 of thebase 10. In this operation, the lower end of themovable contact terminal 40 is inserted in thepress fitting groove 13 of the base 10 from above. A thickness of the lower end of themovable contact terminal 40 including the fixingprojection 41 is smaller than a width of thepress fitting groove 13, ensuring a smooth assembling without causing any scraping debris. Also, because of thecutout 50b provided at one side corner of the movablecontact plate assembly 50, a press fitting can be performed more easily. - A substantial resistive force is obtained at the insertion of the lower end of the
movable contact terminal 40 into thepress fitting groove 13 because a thickness of themovable contact terminal 40 including the pressfitting projection 54f is greater than or equal to the width of thepress fitting groove 13. A further pressing of themovable contact terminal 40 into thepress fitting groove 13 causes the lower edge of the movable contact terminal to be forcedly engaged with the stepped portion (not shown) formed on the inside surface of thepress fitting groove 13 and thereby held immovably. - Although the descriptions have been made to the embodiment in which the two press
fitting projections 54f are formed on the fourthmovable contact plate 54 of the movablecontact plate assembly 50, the present invention is not limited thereto. For example, at least one pressfitting projection 54f may be sufficient. Alternatively, two pressfitting projections 54f may be provided on upper and lower ends of the fourthmovable contact plate 54, namely, four fitting projections may be provided in total. - As shown in
Figs. 2 and3 , therotatable actuator 60 has first andsecond iron plates actuator 60 further has rotatingshafts operation arm 65 protruding from a side surface thereof. - The
actuator 60 is mounted in the base 10 with the rotatingshaft 63 inserted in the bearing recess (not shown) formed in the bottom surface of the base 10 so that one ends of the first andsecond iron plates magnetic poles second iron plates magnetic poles Fig. 8 ). - As shown in
Figs. 2 and3 , theactuator plate 70 has an engaginghole 71 formed on one end thereof. The rectangularengaging hole 71 is configured to engage with theoperation arm 65 of therotatable actuator 60. Theactuator plate 70 further has an upwardly extendingengaging arm 72 integrally formed therewith on the other end thereof to define an engagingslot 73 therebetween. The engagingarm 72 has twopositioning projections 74 formed at lower side thereof. - The
operation arm 65 of therotatable actuator 60 is engaged in the engaginghole 71 of theactuator plate 70. The distal end of the movablecontact plate assembly 50 is engaged in the engagingslot 73. The engagingarm 72 is engaged with theposition regulating tongues 54g of the dividedplate 54a of the fourthmovable contact plate 54 and theposition regulating tongues 54h of the dividedplate 54b. - Further, the position regulating rib 54i of the
position regulating tongue 54h are positioned between the pair ofposition regulating projections 74 of theengaging arm 72, preventing a displacement of the movablecontact plate assembly 50 in a vertical or widthwise direction thereof, which ensures a reliable operating characteristic of the electromagnetic relay. - As shown in
Figs. 2 and3 , theposition regulating plate 80 has a planar configuration to extend between the positioningprojection 14 and the positioning rib (not shown) . Theplate 80 haspositioning projections positioning holes 14a and 15a of thepositioning projection 14 and the positioning rib (not shown), respectively. Theplate 80 further has a throughhole 83 provided on a central portion thereof so that therotation shaft 64 of therotatable actuator 60 can be engaged in the hole. - As shown in
Fig. 3 , the insulatingshield plate 85 is configured so that it can be inserted from theinsertion hole 18 of thebase 10 and has aposition regulating rib 86 formed integrally at one end thereof. As shown inFig. 6B , the insulatingshield plate 85 is inserted into theinsertion hole 18 of the base 10 so that it extends through thesecond slit 34 of thestationary contact terminal 30 and thefirst slit 50a of the movablecontact plate assembly 50 to reach thethird slit 43 of themovable contact terminal 40. Consequently, the insulatingshield plate 85 is positioned in thesecond slit 34, thefirst slit 50a and thethird slit 43 to partition between the opening/closing stationary andmovable contacts movable contacts - As shown in
Fig. 7B , the insulatingshield plate 85 has a plurality ofgrooves 87 formed in parallel on a surface opposing at least the opening/closingstationary contact 31 and the opening/closingmovable contact 57, increasing its surface area and its insulating property. - As shown in
Figs. 2 and3 , acover 90 takes a planar configuration such that it covers the opening of thebase 10 and has at respective diagonally opposing corners thereof cylindrical connectingportions 91 formed with through-holes 91a. Thecover 90 has elastic engaging portion 92s formed in respective positions of the outer peripheral edges, corresponding to the engagingprojections 17 of thebase 10. Thecover 90 has aprojection 93 formed on a ceiling thereof which engages with thecorresponding engagement recess 11a of thepartition wall 11 of thebase 10. - The
cover 90 is mounted from above on the base 10 supporting the above described components already mounted thereon. Thecylinder portions 91 of thecover 90 are engaged in theholes 16 on thebase 10, and the elastic engagingportions 92 of thecover 90 are engaged with the engagingprojection 17 of thebase 10, which completes the assembling of the base and the cover. - According to the embodiment, the larger diameter opening/closing
movable contact 57 is disposed adjacent the opening of thebase 10, which advantageously ensures a reliable inspection and adjustment at the assembling and an enhanced productivity of the relay. -
Figs. 8A and 8B show the electromagnetic relay in operation. The descriptions about its operation will start from the condition in which oneend 61a of the firstmovable iron plate 61 and theother end 62b of the secondmovable iron plate 62 are magnetically attracted to themagnetic poles yokes - From this condition, when the one
end 61a of the firstmovable iron plate 61 and theother end 62b of the secondmovable iron plate 62 are attracted to themagnetic poles yokes actuator plate 70 engaging with theoperation arm 65 of therotatable actuator 60 takes a return position. Then, the opening/closing and conductingmovable contacts stationary contacts stationary contact 31 and the opening/closingmovable contact 57 is shorter than an opposed distance between the conductingstationary contact 32 and the conductingmovable contact 58. - When a voltage is applied to the coil 22 in a manner such that it energizes to cancel the magnetic force of the permanent magnet, the
rotatable actuator 60 rotates against the magnetic force of the permanent magnet, causing that oneend 61a of the firstmovable iron plate 61 and theother end 62b of the secondmovable iron plate 62 are disconnected from themagnetic poles yokes other end 61b of the firstmovable iron plate 61 and oneend 62a of the secondmovable iron plate 62 attract themagnetic poles yokes operation arm 65 of the rotatedrotatable actuator 60 slidingly moves theactuator plate 70 so that the inside surface of the engagingslot 73 of theactuator plate 70 simultaneously forces thebent portions 51g of the firstmovable contact plate 51. This in turn causes that the opening/closingmovable contact 57 and the conductingmovable contact 58 move around fixingprojections 41 where the movable contact plates are fixed to themovable contact terminal 40. This results in that the opening/closingmovable contact 57 makes a contact with the opening/closing stationary contact 31 (Fig. 6B ) and then the conductingmovable contact 58 comes in contact with the conductingstationary contact 32. Further, theactuator plate 70 forces thebent portions 51g of the movablecontact plate assembly 50. It should be noted that, thebent portion 51g of the dividedplate 51b with the conductingmovable contact 58 is shorter than and has a greater spring constant than thebent portion 51g of thedividedplate 51a. This ensures that, even a small amount of movement of the conductingmovable contact 58 relative to the opening/closingmovable contact 57 eventually allows the opening/closingmovable contact 57 and the conductingmovable contact 58 to contact the opening/closingstationary contact 31 and the conductingstationary contact 32 with a uniform contact pressure, respectively. - The application of the voltage to the coil 22 is halted subsequently, in which the
rotatable actuator 60 is held in the same position by the magnetic force of the permanent magnet. - Subsequently, when a voltage is applied to the coil 22 in a manner such that it energizes to cancel the magnetic force of the permanent magnet, the
rotatable actuator 60 rotates in the opposite direction, causing theoperation arm 65 to move theactuator plate 70 and also theengaging arm 72 of theactuator plate 70 to move the distal end of the movablecontact plate assembly 50 back into their original positions, respectively. - According to the present embodiment, the relay is unlikely to be damaged by arcing which may occur between the opening/closing
movable contact 57 and the opening/closingstationary contact 31. Also, the arcing is less-likely to occur between the conductingmovable contact 58 and the conductingstationary contact 32. Advantageously, this prevents shortening of the contact life which would otherwise be caused by the contact wear and ensures a reliable conducting characteristic in the relay. - The insulating
shield plate 85 partitions the opening/closing movable andstationary contacts movable contact movable contact 57 and the opening/closingstationary contact 31, the arcing particles do not adhere to the conductingstationary contact 32 or the conductingmovable contact 58 which would otherwise cause an increase of the contact resistance and heating thereof. - Furthermore, the distal end portion of the insulating
shield plate 85 is inserted to reach thethird slit 43 of themovable contact terminal 40 and the insulatingshield plate 85 is supported at opposite ends, which results in various advantages that the positioning precision increases and it is unlikely to drop off. - The electromagnetic relay according to the second embodiment is substantially the same as the first embodiment, as shown in
Figs. 9A to 16B , except that the insulatingshield plate 85 is integrally formed with theactuator plate 70, which reduces the number of components and/or the manufacturing processes and thereby increases the productivity of the relay. It should be noted that, since the insulatingshield plate 85 is integrally formed with theactuator plate 70, no insertion hole needs to be made in thebase 10. - As shown in
Fig. 15A , theactuator plate 70 has a pair of engagingarms slots 73 therebetween. The engagingslots 73 are configured so that the first and second dividedplate portions contact plate assembly 50 can engage. - As shown in
Fig. 15B , the insulatingshield plate 85 has a plurality ofparallel grooves 87 formed on at least one of its front and rear surfaces of the insertion portion, opposing the opening/closingstationary contact 31, to increase a surface area and then the insulating property thereof. - In the second embodiment, as shown in
Figs. 10 and11 , thestationary contact terminal 30,movable contact terminal 40 and movablecontact plate assembly 50 have asecond slit 34,third slit 43 andfirst slit 50a, respectively, for insertion of the insulatingshield plate 85 in the same manner as in the first embodiment. Themovable contact terminal 40 has a throughhole 44 for insertion of theactuator plate 70 which will be described below, increasing a greater mechanical strength of themovable contact terminal 40 than the first embodiment. - The movable
contact plate assembly 50 is substantially the same as that in the first embodiment as shown inFig. 12 , except that the distal end of one dividedplate 54a has at its distal end a pair ofposition regulating tongues 54g by bending it in the same direction so as to engage upper and lower portions of theengaging arm 75 and the distal end of the other dividedplate 54b has at its distal end a pair ofposition regulating tongues 54h by bending it in the same direction so as to engage upper and lower portions of theengaging arm 75. - Because other structures are substantially the same as the corresponding structures of the first embodiment, like parts are designated by like reference numerals and duplicate descriptions are eliminated.
-
Figs. 16A and 16B show the electromagnetic relay in operation. The descriptions about its operation will start from the condition in which oneend 61a of the firstmovable iron plate 61 and theother end 62b of the secondmovable iron plate 62 are magnetically attracted to themagnetic poles yokes - From this condition, when the one
end 61a of the firstmovable iron plate 61 and theother end 62b of the secondmovable iron plate 62 are attracted to themagnetic poles yokes actuator plate 70 engaging with theoperation arm 65 of therotatable actuator 60 takes a return position. Then, the opening/closing and conductingmovable contacts stationary contacts stationary contact 31 and the opening/closingmovable contact 57 is shorter than an opposed distance between the conductingstationary contact 32 and the conductingmovable contact 58. - When a voltage is applied to the coil 22 in a manner such that it energizes to cancel the magnetic force of the permanent magnet, the
rotatable actuator 60 rotates against the magnetic force of the permanent magnet, causing that oneend 61a of the firstmovable iron plate 61 and theother end 62b of the secondmovable iron plate 62 are disconnected from themagnetic poles yokes other end 61b of the firstmovable iron plate 61 and oneend 62a of the secondmovable iron plate 62 attract themagnetic poles yokes operation arm 65 of the rotatedrotatable actuator 60 slidingly moves theactuator plate 70 so that the inside surface of the engagingslot 73 of theactuator plate 70 simultaneously forces thebent portions 51g of the firstmovable contact plate 51. This in turn causes that the opening/closingmovable contact 57 and the conductingmovable contact 58 move around fixingprojections 41 where the movable contact plates are fixed to themovable contact terminal 40. This results in that the opening/closingmovable contact 57 makes a contact with the opening/closing stationary contact 31 (Fig. 16B ) and then the conductingmovable contact 58 comes in contact with the conductingstationary contact 32. Further, theactuator plate 70 forces thebent portions 51g of the movablecontact plate assembly 50. This causes that the opening/closingmovable contact 57 and the conductingmovable contact 58 make contacts with the opening/closingstationary contact 31 and the conductingstationary contact 32, respectively. - The application of the voltage to the coil 22 is halted subsequently, in which the
rotatable actuator 60 is held in the same position by the magnetic force of the permanent magnet. - Subsequently, when a voltage is applied to the coil 22 in a manner such that it energizes to cancel the magnetic force of the permanent magnet, the
rotatable actuator 60 rotates in the opposite direction, causing theoperation arm 65 to move theactuator plate 70 and also theengaging arm 72 of theactuator plate 70 to move the distal end of the movablecontact plate assembly 50 back into their original positions, respectively. - According to the present embodiment, the relay is unlikely to be damaged by arcing which may occur between the opening/closing
movable contact 57 and the opening/closingstationary contact 31. Also, the arcing is less-likely to occur between the conductingmovable contact 58 and the conductingstationary contact 32. Advantageously, this prevents shortening of the contact life which would otherwise be caused by the contact wear and ensures a reliable conducting characteristic in the relay. - The insulating
shield plate 85 partitions the opening/closing movable andstationary contacts movable contacts movable contact 57 and the opening/closingstationary contact 31, the arcing particles do not adhere to the conductingstationary contact 32 or the conductingmovable contact 58 which would otherwise cause an increase of the contact resistance and heating thereof. - The electromagnetic relay according to the invention is not limited to that described above, and the invention can be applied to various electromagnetic relays and electronic devices.
-
- 10
- base
- 11
- partition wall
- 12a,
- 12b terminal slit
- 13
- fitting groove
- 18
- insertion hole
- 20
- electromagnetic unit
- 21
- spool
- 22
- coil
- 23
- iron core
- 24
- yoke
- 24a
- magnetic pole
- 25
- yoke
- 25a
- magnetic pole
- 30
- stationary contact terminal
- 31
- opening/closing stationary contact
- 32
- conducting stationary contact
- 33
- terminal portion
- 34
- second slit
- 40
- movable contact terminal
- 41
- fixing projection
- 42
- terminal portion
- 43
- third slit
- 50
- movable contact plate assembly
- 50a
- first slit
- 50b
- cutout
- 51
- first movable contact plate
- 51f
- aperture
- 51g
- bent portion
- 52
- second movable contact plate
- 53
- third movable contact plate
- 54
- fourth movable contact plate
- 54f
- press fitting projection
- 54g
- position regulating tongue
- 54h
- position regulating tongue
- 55
- first divided plate portion
- 56a
- fold
- 57
- opening/closing movable contact
- 58
- conducting movable contact
- 60
- rotatable actuator
- 61
- first movable iron plate
- 62
- second movable iron plate
- 63
- rotating shaft
- 64
- rotating shaft
- 65
- operation arm
- 70
- actuator plate
- 71
- engaging hole
- 72
- engaging arm
- 73
- engaging slot
- 74
- positioning projection
- 75
- engaging arm
- 76
- engaging arm
- 80
- position regulating plate
- 85
- insulating shield plate
- 86
- position regulating rib
- 87
- groove
- 90
- cover
Claims (4)
- An electromagnetic relay for moving, in a reciprocating manner, an actuator plate (70) by electrically energizing an electromagnetic unit (20), causing a pair of neighboring first and second movable contacts (57, 58) to make and break contacts with a pair of neighboring first and second stationary contacts (31, 32) opposing the movable contacts (57, 58), said electromagnetic relay comprisinga movable contact plate assembly (50) including a pair of first and second plate portions (55, 56) extending in parallel to each other and separated by a first slit (50a) defined between the first and second plate portions (55, 56) ;said pair of first and second movable contacts (57, 58) mounted on the first and second plate portions (55, 56), respectively;said pair of first and second stationary contacts (31, 32) fixed to oppose to the first and second movable contacts (57, 58), respectively;a shield plate (85) disposed in the first slit (50a) between the first movable and stationary contacts (57, 31) and the second movable and stationary contacts (58, 32),the shield plate (85) having
a first major surface adjacent to the first movable and stationary contacts (57, 31) and a second major surface adjacent to the second movable and stationary contacts (58, 32), characterised in that at least one of the first and second major surfaces includes parallel grooves (87) so that an insulation distance between the first movable and stationary contacts (57, 31) and the second movable and stationary contacts (58, 32) is increased and particles generated by contacts of the first movable and stationary contacts (57, 31) and contacts of the second movable and stationary contacts (58, 32) are captured by the parallel grooves (87); anda stationary contact terminal (30) supporting the first and second stationary contacts (31, 32),
the stationary contact terminal (30) including a second slit (34), wherein the shield plate (85) is positioned in the second slit (34) of the stationary contact terminal (30) between the first movable and stationary contacts (57, 31) and the second movable and stationary contacts (58, 32). - The electromagnetic relay of claim 1, further comprising a housing (10) accommodating the first and second stationary contacts (31, 32), the housing (10) including an insertion hole (18) in which the shield plate (85) is inserted.
- The electromagnetic relay of claim 1, further comprising
said actuator plate (70) for moving the movable contact plate assembly (50), the shield plate (85) being integrally formed with the actuator plate (70). - The electromagnetic relay according to any of claims 1 to 3, wherein the shield plate (85) is formed of an insulating material.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014032940A JP5773006B1 (en) | 2014-02-24 | 2014-02-24 | Electromagnetic relay |
PCT/JP2014/070765 WO2015125319A1 (en) | 2014-02-24 | 2014-08-06 | Electromagnetic relay |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3113204A1 EP3113204A1 (en) | 2017-01-04 |
EP3113204A4 EP3113204A4 (en) | 2017-09-27 |
EP3113204B1 true EP3113204B1 (en) | 2019-10-16 |
Family
ID=53877850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP14841353.7A Active EP3113204B1 (en) | 2014-02-24 | 2014-08-06 | Electromagnetic relay |
Country Status (7)
Country | Link |
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EP (1) | EP3113204B1 (en) |
JP (1) | JP5773006B1 (en) |
CN (1) | CN105050675B (en) |
BR (1) | BR112015004482A2 (en) |
MX (1) | MX2015003171A (en) |
RU (1) | RU2015107867A (en) |
WO (1) | WO2015125319A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6414019B2 (en) | 2015-10-29 | 2018-10-31 | オムロン株式会社 | relay |
JP6458705B2 (en) | 2015-10-29 | 2019-01-30 | オムロン株式会社 | relay |
JP6471678B2 (en) * | 2015-10-29 | 2019-02-20 | オムロン株式会社 | Contact piece unit and relay |
JP6624384B2 (en) * | 2016-02-05 | 2019-12-25 | パナソニックIpマネジメント株式会社 | Electromagnetic relay |
US11887797B2 (en) * | 2016-10-07 | 2024-01-30 | Te Connectivity Germany Gmbh | Electrical switching element comprising a direct armature coupling |
JP6959728B2 (en) * | 2016-11-04 | 2021-11-05 | 富士通コンポーネント株式会社 | Electromagnetic relay |
JP6376231B1 (en) * | 2017-02-28 | 2018-08-22 | オムロン株式会社 | Electromagnetic relay and smart meter |
JP6948613B2 (en) | 2017-04-14 | 2021-10-13 | パナソニックIpマネジメント株式会社 | Contact devices and electromagnetic relays |
BR102020008025A2 (en) * | 2019-04-24 | 2020-11-03 | Xiamen Hongfa Electric Power Controls Co., Ltd. | MAGNETIC LOCKING RELAY |
CN110085487B (en) * | 2019-05-21 | 2021-04-30 | 桂林电子科技大学 | Novel permanent-magnet electromagnetic relay |
JP7036885B1 (en) | 2020-10-30 | 2022-03-15 | 松川精密股▲ふん▼有限公司 | Relay structure |
MX2023006995A (en) * | 2020-12-15 | 2023-06-26 | Xiamen Hongfa Electric Power Controls Co Ltd | Relay movable spring capable of reducing temperature rise and relay. |
CN114743835B (en) * | 2021-01-07 | 2023-12-01 | 厦门台松精密电子有限公司 | Contact spring plate structure of electromagnetic relay |
JP7359914B1 (en) | 2022-07-28 | 2023-10-11 | 大崎電気工業株式会社 | Electronic electricity meter switch |
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FR1431326A (en) * | 1964-03-26 | 1966-03-11 | Stotz Kontakt Gmbh | Switch and in particular air contactor for extra-closing currents |
JPS567322A (en) * | 1979-06-29 | 1981-01-26 | Matsushita Electric Works Ltd | Electromagnetic relay |
JPS5871918U (en) * | 1981-10-27 | 1983-05-16 | オムロン株式会社 | contact device |
GB2203288B (en) * | 1987-04-09 | 1991-10-09 | Ped Ltd | Improvements in and relating to relays |
DE9404775U1 (en) * | 1994-03-22 | 1994-06-09 | W. Gruner Gmbh Relaisfabrik, 78564 Wehingen | Contact system with tungsten flow contact for switching relays for high inrush current peaks |
JP2005166431A (en) * | 2003-12-02 | 2005-06-23 | Omron Corp | Electromagnetic relay |
JP4424260B2 (en) * | 2005-06-07 | 2010-03-03 | オムロン株式会社 | Electromagnetic relay |
CH698492B1 (en) * | 2006-03-20 | 2009-08-31 | Elesta Relays Gmbh | Relay. |
US7659800B2 (en) * | 2007-08-01 | 2010-02-09 | Philipp Gruner | Electromagnetic relay assembly |
JP2010123545A (en) * | 2008-11-21 | 2010-06-03 | Panasonic Electric Works Co Ltd | Electromagnetic relay |
JP5624431B2 (en) * | 2010-11-08 | 2014-11-12 | パナソニック株式会社 | Electromagnetic relay |
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2014
- 2014-02-24 JP JP2014032940A patent/JP5773006B1/en active Active
- 2014-08-06 CN CN201480001971.6A patent/CN105050675B/en active Active
- 2014-08-06 RU RU2015107867A patent/RU2015107867A/en unknown
- 2014-08-06 BR BR112015004482A patent/BR112015004482A2/en not_active IP Right Cessation
- 2014-08-06 MX MX2015003171A patent/MX2015003171A/en unknown
- 2014-08-06 EP EP14841353.7A patent/EP3113204B1/en active Active
- 2014-08-06 WO PCT/JP2014/070765 patent/WO2015125319A1/en active Application Filing
Non-Patent Citations (1)
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Also Published As
Publication number | Publication date |
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WO2015125319A1 (en) | 2015-08-27 |
CN105050675B (en) | 2017-06-20 |
EP3113204A1 (en) | 2017-01-04 |
MX2015003171A (en) | 2016-01-11 |
BR112015004482A2 (en) | 2017-07-04 |
JP5773006B1 (en) | 2015-09-02 |
CN105050675A (en) | 2015-11-11 |
RU2015107867A3 (en) | 2018-03-29 |
JP2015159025A (en) | 2015-09-03 |
EP3113204A4 (en) | 2017-09-27 |
RU2015107867A (en) | 2018-03-29 |
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