EP3635765B1 - Improved thermomagnetic actuator in a security electric switch - Google Patents

Improved thermomagnetic actuator in a security electric switch Download PDF

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Publication number
EP3635765B1
EP3635765B1 EP18733703.5A EP18733703A EP3635765B1 EP 3635765 B1 EP3635765 B1 EP 3635765B1 EP 18733703 A EP18733703 A EP 18733703A EP 3635765 B1 EP3635765 B1 EP 3635765B1
Authority
EP
European Patent Office
Prior art keywords
casing
yoke
anchor
thermal insulating
needle
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.)
Active
Application number
EP18733703.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3635765A1 (en
Inventor
Lucjan STREHAR
Domen Janc
Admir BAJRIC
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nela Razvojni Center za Elektroindustrijo in Elektroniko doo
Original Assignee
Nela Razvojni Center za Elektroindustrijo in Elektroniko doo
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nela Razvojni Center za Elektroindustrijo in Elektroniko doo filed Critical Nela Razvojni Center za Elektroindustrijo in Elektroniko doo
Priority to PL18733703T priority Critical patent/PL3635765T3/pl
Priority to RS20210754A priority patent/RS61978B1/sr
Publication of EP3635765A1 publication Critical patent/EP3635765A1/en
Application granted granted Critical
Publication of EP3635765B1 publication Critical patent/EP3635765B1/en
Priority to HRP20210886TT priority patent/HRP20210886T1/hr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H01H2071/407—Combined electrothermal and electromagnetic mechanisms the thermal element being heated by the coil of the electromagnetic mechanism
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Definitions

  • the invention refers to electricity, in particular to basic electric components, namely to switches and construction details related to switches, which are controlled by means of a suitable lever, and in particular to switches which are used in protection against electric overloads.
  • the aim of the invention is to create such thermomagnetic actuator for use in a security electric switch, which should upon integration thereof into each electric circuit be able to react much more accurate and quicker than known actuators in the state of the art switches, either to thermal overloads or also to a short circuit current occurred within said electric circuit.
  • thermomagnetic actuator As disclosed in DE 36 37 275 A1 , interruption of an electric circuit, when a current overload occurs, can be achieved by means of a thermomagnetic actuator with a bimetallic disc, which is placed on an actuating needle, which is axially displaceable and inserted within a tubular casing, from which then said needle protrudes in a direction towards an interrupting assembly, which serves for interrupting of said circuit.
  • a thermomagnetic actuator has been created and used in protecting switches, which are as such disclosed in EP 2 545 576 B1 and in EP 2 837 014 B1 .
  • the electric circuit extends through a coil, which is wound around said casing and is intended for intensifying of the magnetic field every time, when a sufficiently high current overload would occur.
  • An anchor is firmly connected with said actuating needle and is exposed to said magnetic field.
  • Said anchor is furnished with an one-side blinded axial passage, which is opened in a direction towards a yoke, which is also mounted within said casing on that side, which is faced towards said interrupting assembly, and said axially to and fro displaceable actuating needle is inserted therein.
  • a spring is inserted within said blinded passage and protrudes from said passage towards the yoke.
  • time delay prior to interruption of the electric circuit is often quite problematic and is extremely difficultly maintained within still acceptable limits.
  • Said time delay by interrupting of the electric circuit could be generally reduced by intensifying of heat generating, e.g. by increasing the resistance in coil windings, which would however lead to permanently increasing of electric losses, which is quite inacceptable from the commercial point of view.
  • Thermomagnetic actuators are also disclosed in US 5 565 828 and EP 1 083 586 A2 .
  • the present invention refers to an improved thermomagnetic actuator in a security electric switch.
  • a security electric switch which comprises a tubular casing, which is closed on its one end portion and which is widened on its open end portion and is in the area of said open end portion adapted to receive a cover.
  • an actuating needle is inserted within said casing, which is centrally arranged and displaceable to and fro along said casing and which moreover in the area of said cover protrudes outside of said casing towards each disposable interrupting mechanism, which serves for establishing or interrupting of the electric circuit extending throughout said switch.
  • Said needle is placed at certain distance apart from the closed end portion of said casing.
  • An immovable yoke and a displaceable anchor are inserted within said casing, wherein that said yoke is located adjacent to said widened open end portion of the casing and the needle is extending through it with the possibility of its previously mentioned to and fro displacement, and wherein said anchor is arranged in the area of said closed end portion of the casing adjacent to said needle and can be displaced to and fro within said casing towards the yoke or away from it.
  • a compression spring is inserted within said casing between said yoke and said anchor and is intended to depress the anchor apart from the yoke.
  • a cavity is adapted to receive a portion of said spring, which is faced towards the anchor, but not also that portion of the spring, which is faced towards the yoke.
  • a bimetallic disc is inserted within said casing, through which said actuating needle is extending and is by means of said bimetallic disc axially displaceable in a direction towards said interrupting assembly of the switch.
  • an electromagnetic coil is wound around said casing and is electrically connectable into each electric circuit, which is established throughout said security electric switch, in which said thermomagnetic actuator is integrated.
  • the present invention proposes that said yoke is along its complete circumference spaced apart from the internal surface of the casing and is surrounded with an thermal insulating ring, which is uninterrupted along its complete circumference and is on the one hand rest on the internal surface of the casing and on the other hand on said yoke.
  • said anchor is, at least on its side which is faced towards the closed end portion of the casing, furnished with a centrally arranged axial through-passage, and on its opposite side, which is faced towards the yoke, with a centrally arranged cavity, wherein said passage in the anchor is adapted to receive a thermal insulating guide, which is inserted between the anchor and the casing.
  • a thermal insulating bush is inserted between said bimetallic disc and said actuating needle and is displaceable arranged on said actuating needle and guided therewith, wherein its displacement is limited on the one hand by a thickened area on the actuating needle and on the other hand by said bimetallic disc.
  • the invention further provides that said thermal insulating guide of the anchor, said thermal insulating bush and said thermal insulating ring all consist of a non-ferromagnetic thermal insulating material, in particular of plastic.
  • thermomagnetic actuator in a security electric switch is together with each belonging interrupting assembly mountable within the casing of a security electric switch, which is as such disclosed in EP 2 545 576 B1 and EP 2837014 B1 .
  • thermomagnetic actuator comprises a tubular casing 1, which preferably consists of aluminium and is closed on its one end portion 1" and is moreover widened on its open end portion 1', and is in the area of said open end portion 1' adapted to receive a cover 8.
  • Said cover 8 consists of a non-ferromagnetic material, e.g. of plastics, and is in this shown embodiment mechanically pressed onto said casing 1 and furnished with a through-passage, so that an actuating needle 5 extends there-through, which is centrally arranged within the casing 1 and protrudes outside of the casing 1.
  • Said actuating needle is axially displaceable to and fro along said casing 1 and protrudes outside of said casing 1 towards each disposable interrupting mechanism, which serves for establishing or interrupting of the electric circuit extending throughout said switch.
  • said needle 5 is placed at certain distance apart from the closed end portion 1" of said casing 1.
  • an immovable yoke 6 and a displaceable anchor 2 are inserted within said casing 1, so that said yoke 6 is located adjacent to said widened open end portion 1' of the casing 1 and the needle 5 is extending through it with the possibility of its previously mentioned to and fro displacement, while the anchor 2 is arranged in the area of said closed end portion 1" of the casing 1 adjacent to said needle 5 and can be displaced to and fro within said casing 1 towards the yoke 6 or away from it.
  • a compression spring 3 is also inserted within said casing 1 between said yoke 6 and said anchor 2 and is intended to depress the anchor 2 apart from the yoke 6.
  • a bimetallic disc 7 is inserted within said casing 1 in the area of its widened end portion 1', through which said actuating needle 5 is extending, wherein by means of said bimetallic disc (7) said needle 5 is axially displaceable in a direction towards said interrupting assembly of the switch.
  • an electromagnetic coil 4 is wound around said casing 1, which is electrically connectable into each electric circuit, which is established throughout said security electric switch, in which said thermomagnetic actuator is integrated.
  • Said yoke 6 is along its complete circumference spaced apart from the internal surface of the casing 1 and is surrounded with an thermal insulating ring 10, which is uninterrupted along its complete circumference and is on the one hand rest on the internal surface of the casing 1 and on the other hand on said yoke 6.
  • said thermal insulating ring 10 is made of a non-ferromagnetic thermal insulating material, optionally of plastics, and is tightly inserted between the yoke 6 and the casing 1.
  • a thermal insulating bush 11 is inserted between said bimetallic disc 7 and said actuating needle 5, wherein said bush 11 is displaceable arranged on said actuating needle 5 and is guided therewith, wherein its displacement is limited on the one hand by a thickened area 5' on the actuating needle 5 and on the other hand by said bimetallic disc 7.
  • the anchor 2 is at least on its side, which is faced towards the closed end portion 1" of the casing 1, furnished with a centrally arranged axial through-passage 2', and on its opposite side, which is faced towards the yoke 6, with a centrally arranged cavity 2", wherein said passage 2' within the anchor 2 is adapted to receive a thermal insulating guide 9, which is in this case made of plastics and is inserted between the anchor 2 and the casing 1, while said cavity 2" is adapted to receive a portion of said spring 3, which is faced towards the anchor 2, but not also that portion of the spring 3, which is faced towards the yoke 6.
  • thermomagnetic actuator according to the invention is functioning quite similar like the known actuator, which is disclosed in EP 2 545 576 B1 and EP 2 837 014 B1 .
  • the actuator according to the invention excels in essentially improved heat transfer from the source i.e. the coil 4 towards said bimetallic disc 7.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermally Actuated Switches (AREA)
  • Push-Button Switches (AREA)
  • Electromagnets (AREA)
  • Fuses (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP18733703.5A 2017-06-06 2018-05-10 Improved thermomagnetic actuator in a security electric switch Active EP3635765B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL18733703T PL3635765T3 (pl) 2017-06-06 2018-05-10 Udoskonalone termomagnetyczne urządzenie uruchamiające w elektrycznym przełączniku zabezpieczającym
RS20210754A RS61978B1 (sr) 2017-06-06 2018-05-10 Poboljšani termomagnetni aktuator u sigurnosnom električnom prekidaču
HRP20210886TT HRP20210886T1 (hr) 2017-06-06 2021-06-04 Poboljšani termomagnetski aktuator pogodan za upotrebu u sigurnosnom električnom prekidaču

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SI201700157A SI25460B (sl) 2017-06-06 2017-06-06 Izpopolnjen termično-magnetni prožilnik varnostnega električnega stikala
PCT/SI2018/000008 WO2018226165A1 (en) 2017-06-06 2018-05-10 Improved thermomagnetic actuator in a security electric switch

Publications (2)

Publication Number Publication Date
EP3635765A1 EP3635765A1 (en) 2020-04-15
EP3635765B1 true EP3635765B1 (en) 2021-04-28

Family

ID=62713061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18733703.5A Active EP3635765B1 (en) 2017-06-06 2018-05-10 Improved thermomagnetic actuator in a security electric switch

Country Status (7)

Country Link
EP (1) EP3635765B1 (ru)
HR (1) HRP20210886T1 (ru)
PL (1) PL3635765T3 (ru)
RS (1) RS61978B1 (ru)
RU (1) RU2766444C2 (ru)
SI (1) SI25460B (ru)
WO (1) WO2018226165A1 (ru)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3637275C1 (en) * 1986-11-03 1988-05-05 Flohr Peter Overcurrent trip device for protection switching apparatuses
FR2689308B1 (fr) * 1992-03-31 1994-05-20 Merlin Gerin Mecanisme de commande a palonnier pour disjoncteur electrique a phase et neutre.
DE4406670C3 (de) * 1994-03-01 1999-09-09 Kopp Heinrich Ag Leitungsschutzschalter
DE19847155A1 (de) * 1998-10-13 2000-04-20 Kopp Heinrich Ag Überstromauslöser
DE19942694C2 (de) * 1999-09-07 2002-06-27 Eti Elektroelement Dd Auslöser für elektrische Schutzschalter
ITMI20072330A1 (it) * 2007-12-13 2009-06-14 Bticino Spa Dispositivo di manovra ad accumulo di energia elettrica per interruttori o sezionatori
ITMI20090009A1 (it) * 2009-01-08 2010-07-09 Abb Spa Meccanismo di comando per un dispositivo di interruzione e dispositivo di interruzione comprendente tale meccanismo.
ITMI20090425U1 (it) * 2009-12-23 2011-06-24 Abb Spa Dispositivo di commutazione elettrica per circuiti di bassa tensione.
ITMI20100058U1 (it) * 2010-03-01 2011-09-02 Abb Spa Meccanismo di comando per dispositivi di commutazione elettrica e relativo dispositivo

Also Published As

Publication number Publication date
EP3635765A1 (en) 2020-04-15
PL3635765T3 (pl) 2021-09-27
WO2018226165A1 (en) 2018-12-13
SI25460B (sl) 2021-11-30
HRP20210886T1 (hr) 2021-07-23
RS61978B1 (sr) 2021-07-30
SI25460A (sl) 2018-12-31
RU2019144202A3 (ru) 2021-08-16
RU2019144202A (ru) 2021-07-09
RU2766444C2 (ru) 2022-03-15

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