EP0871194B1 - Bilame usinée - Google Patents
Bilame usinée Download PDFInfo
- Publication number
- EP0871194B1 EP0871194B1 EP97440034A EP97440034A EP0871194B1 EP 0871194 B1 EP0871194 B1 EP 0871194B1 EP 97440034 A EP97440034 A EP 97440034A EP 97440034 A EP97440034 A EP 97440034A EP 0871194 B1 EP0871194 B1 EP 0871194B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bimetallic strip
- fact
- section
- bimetallic
- previous
- 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.)
- Expired - Lifetime
Links
Images
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
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H2037/525—Details of manufacturing of the bimetals, e.g. connection to non bimetallic elements or insulating coatings
Definitions
- the present invention mainly relates to a bimetallic strip high efficiency thermal, in particular usable in applications in which the mechanical effect resulting from the temperature increase is not enough with bimetallic strips traditional crossings by a given current.
- the thermal effect causing the use bimetal strips does not in fact come from variations in the room temperature, but is caused artificially, mainly by the Joule effect.
- This can be direct, like mentioned above, or indirect, obtained using an element resistive heater electrically isolated from the bimetallic strip and transmitting it additional heat. These additional resistive elements are precisely used when the mechanical effect due to the direct Joule effect is not enough.
- bimetallic strip of the invention is by nature usable in all current applications of bimetallic strips, we will refer in the continuation of the description of their use in circuit breakers, as preferential example and to support the discussion.
- the aforementioned bimetallic elements cause the so-called thermal tripping of the circuit breaker in the event of an overload in the protected line.
- the bimetallic strip is integrated into the circuit, crossing the circuit breaker, and acts, by its deformation, on a mechanism trigger which controls the opening of the movable contact, and by following, the opening of the electrical circuit crossing the circuit breaker and the line it protected.
- the bimetallic strip is therefore traversed by the current passing through the circuit breaker, and is a resistive element that the heat resulting from the Joule effect contributes mainly to distort.
- the overload reaches a higher value at the rated current for which the circuit breaker is designed, the heat energy from the Joule effect becomes sufficient for the mechanical energy obtained by the deformation of the bimetal strip is enough to cause tripping, from the displacement of its free end.
- the bimetallic strip After a first contact with the trigger mechanism, the bimetallic strip actually stores energy until it can rotate the trigger.
- the effort required to trigger is not very high, but it assumes, however, a certain stiffness of the bimetallic element. A problem arises, however, when the instrument's intensity calibration is low, in practice approximately below 10 A.
- the bimetallic element is then dimensioned to guarantee a stiffness sufficient, and it is heated to the required temperature thanks to the supply of heat provided by said independent resistive element, electrically isolated from the bimetallic strip.
- the solution proposed by the present invention allows operation with currents below 10 A, without additional resistive heating, the proposed bimetallic strip having however a sufficient stiffness to ensure by example the tripping of the circuit breaker.
- one of the objectives of the bimetallic strips of the invention is guarantee a mechanical effect comparable to that obtained conventionally with bimetallic strips of substantially identical dimensions, despite a lower nominal operating current.
- Another objective of the invention is to simplify the construction of circuit breakers or other devices hitherto provided with resistive devices additional, and therefore to harmonize the construction of the ranges.
- Another objective is to reduce the costs of these devices by eliminating said resistive device and thereby eliminating the problem of coupling thermal.
- This calorific power causes, more or less quickly, a deformation of the bimetal strip which brings it into contact with the triggering mechanism, firstly, then an imbalance of the internal tensions, secondly, the result of which is opposed to the resistance to unlocking of this mechanism, up to exceeding it and causing unlocking.
- bimetallic strips which are the subject of the present invention have the particularity offer, at equivalent cross-section, a significantly higher moment of inertia than that obtained with a rectangular section, while limiting the thickness in order to maintain good deformability under the Joule effect.
- Said bimetallic strips are conventionally produced from two strips of metals with a substantially rectangular section, having coefficients of different linear dilations joined together according to a joint plane whose surface looks parallel to the sides of the bimetallic strip having the largest area, and are characterized in that one of said long sides has in section at least one cut developing in the direction of said joint plane.
- the bimetallic strip has at least one recess practiced in one of its long flat sides, necessarily dug in direction of the bonding surface of two metals forming the element bimetallic.
- said cut corresponds to a removal of material practiced longitudinally over all or part of the length of the bimetallic strip, so as to form a groove.
- said removal of material is carried out by machining on one of the large faces of the bimetallic strip.
- the bimetallic strip has only one cut of substantially rectangular section, practiced centered with respect to the axis of a of said long sides, so that the section of the bimetallic strip has a U-shaped configuration.
- a variant consists in making parallel cuts, giving a crenellated configuration in the bimetal section. Said parallel cuts longitudinal can be practiced at the outer edges, and do not leave only a central rib parallel to the main axis of the bimetallic strip.
- the bimetallic strips of the invention can also equip multiple devices controlled by bimetallic elements and hitherto limited to one lower threshold of nominal current, or requiring a resistive member additional for lower currents.
- the bimetallic strip of the invention when the bimetallic strip of the invention is integrated into the thermal sub-assembly of a circuit breaker, it is placed centrally in said sub-assembly, comprising a conductive sheet of arc guide connected to one of its ends, which is also connected to a circuit breaker connection terminal, the other end of the bimetallic strip being connected to the movable contact of said circuit breaker by means of a braid flexible conductive.
- the bimetallic strips of the invention are very easy to manufacture, and their cost is approximately equivalent that of the bimetallic strips previously known.
- Figure 1 shows a preferred configuration of a bimetallic strip (1) according to the invention, with an axial prismatic groove (2) leaving two axial edges (3 and 4) at the lateral ends of the bimetallic strip (1).
- the section of figure 2 takes again the configuration of figure 1, the section showing the two blades joined together according to a joint plane (5) parallel to the large faces of the bimetallic strip.
- the groove (2) is preferably made by removing material, by example by machining.
- machining By way of nonlimiting examples, milling or rectification are possible machining techniques.
- FIG. 3 shows a possible variant of the form of FIGS. 1 and 2, comprising a crenellation with intermediate beams (3 ', 4') defining new lateral grooves (2 ', 2 ").
- Figures 3bis and 3ter show other variants, with a rib central longitudinal in 3bis, and a pseudo-symmetrical configuration in figure 3ter, the references (2 ', 3', 4 ') corresponding on the lower blade to references (2, 3, 4) of the upper blade.
- FIG. 4 shows the integration of a bimetallic strip (1) according to the invention to a particular circuit breaker (D). Not being the subject of the invention, said circuit breaker does not will of course not be described in detail in the context of this description.
- the bimetallic strip (1) is connected via a braid conductive (10) to a connection terminal (11) of the circuit breaker (D).
- a screw (14) accessible from the outside of the housing allows adjustment of the bimetallic strip (1). This is connected to the level of its other end at the movable contact (15), also via a braid conductive (16).
- a function (17) has the function of actuating the trigger (18) in the event overload in the circuit protected by the circuit breaker (D). It slides for this purpose parallel to the base when it is driven by the bimetallic strip (1).
- This coach (17) has two end fingers in contact first with the bimetallic strip (1), then also the trigger (18) when an overload occurs.
- Figures 5 and 6 show the shape of the travel of a bimetallic strip, as well as the pace of the force exerted, as a function of time in both cases.
- point A corresponds to the entry into contact of the bimetallic strip (1) with the coach (17), the latter being in contact with the trigger (18).
- C represents the travel to disjunction, the time required being referenced t1.
- said bimetallic strip (1) stores energy up to ability to rotate trigger (18). The latter pivots and causes the circuit breaker (D).
- the value of the unlocking force Fd corresponds to the point culminating in the curve, when the tangent is horizontal and the slope reverses.
Landscapes
- Thermally Actuated Switches (AREA)
- Breakers (AREA)
- Surgical Instruments (AREA)
Description
- La figure 1 est une vue en perspective d'une bilame selon l'invention ;
- La figure 2 est une coupe de ladite bilame ;
- Les figures 3, 3bis et 3ter représentent, toujours en coupe, des variantes possibles ;
- La figure 4 montre une bilame intégrée à un disjoncteur ;
- La figure 5 représente un diagramme donnant la course de déverrouillage en fonction du temps ; et
- La figure 6 représente un diagramme donnant la force de déverrouillage, également en fonction du temps.
Claims (8)
- Bilame thermique (1) réalisée à partir de deux bandes de métaux à section sensiblement rectangulaire, présentant des coefficients de dilatation linéiques différents et accolées suivant un plan de joint (5, 6) dont la surface est d'allure parallèle aux côtés de la bilame (1) de la plus grande surface, caractérisée en ce que l'un desdits grands côtés comporte en section au moins une découpe (2) se développant en direction dudit plan de joint (5, 6).
- Bilame thermique (1) selon la revendication 1, caractérisée en ce que ladite découpe (2) correspond à un enlèvement de matière pratiqué longitudinalement sur toute ou partie de la longueur de la bilame de manière à former une gorge.
- Bilame thermique (1) selon la revendication précédente, caractérisée en ce que ledit enlèvement de matière est réalisé par usinage axial de l'un des grands côtés de la bilame.
- Bilame thermique (1) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle ne comporte qu'une seule découpe (2) de section sensiblement rectangulaire, pratiquée centrée par rapport à l'axe d'un desdits grands côtés, de sorte que la section de la bilame (1) présente une configuration en U.
- Bilame thermique (1) selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'elle comporte des découpes parallèles (2, 2', 2"), donnant une configuration crénelée à la section de la bilame (1).
- Bilame thermique (1) selon la revendication précédente, caractérisée en ce qu'elle comporte des découpes parallèles (2, 2') longitudinales externes laissant subsister au moins une nervure centrale parallèle à l'axe principal de la bilame.
- Bilame thermique (1) selon l'une quelconque des revendications 1 à 3 et 5 à 6, caractérisée en ce qu'elle comporte au moins une découpe sur chacune des lames formant la bilame (1).
- Bilame thermique (1) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle est intégrée au sous-ensemble thermique d'un disjoncteur D, ledit sous-ensemble comportant une tôle (12) conductrice de guidage d'arc connectée à l'une des extrémités de ladite bilame (1), ladite extrémité étant également reliée à une borne de connexion (11) du disjoncteur D, l'autre extrémité de la bilame (1) étant reliée au contact mobile (15) dudit disjoncteur D au moyen d'une tresse conductrice souple (16).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT97440034T ATE182717T1 (de) | 1997-04-09 | 1997-04-09 | Bearbeitetes bimetall |
DE69700359T DE69700359D1 (de) | 1997-04-09 | 1997-04-09 | Bearbeitetes Bimetall |
EP97440034A EP0871194B1 (fr) | 1997-04-09 | 1997-04-09 | Bilame usinée |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97440034A EP0871194B1 (fr) | 1997-04-09 | 1997-04-09 | Bilame usinée |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0871194A1 EP0871194A1 (fr) | 1998-10-14 |
EP0871194B1 true EP0871194B1 (fr) | 1999-07-28 |
Family
ID=8229977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97440034A Expired - Lifetime EP0871194B1 (fr) | 1997-04-09 | 1997-04-09 | Bilame usinée |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0871194B1 (fr) |
AT (1) | ATE182717T1 (fr) |
DE (1) | DE69700359D1 (fr) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE612598C (de) * | 1935-04-29 | Siemens Schuckertwerke Akt Ges | Durch unmittelbaren Stromdurchfluss beheizter Bimetallstreifen, insbesondere fuer thermisch gesteuerte Schalter |
-
1997
- 1997-04-09 DE DE69700359T patent/DE69700359D1/de not_active Expired - Lifetime
- 1997-04-09 AT AT97440034T patent/ATE182717T1/de not_active IP Right Cessation
- 1997-04-09 EP EP97440034A patent/EP0871194B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0871194A1 (fr) | 1998-10-14 |
DE69700359D1 (de) | 1999-09-02 |
ATE182717T1 (de) | 1999-08-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2750793A1 (fr) | Dispositif de protection thermique pour moteurs electriques | |
FR2803686A1 (fr) | Pole pour disjoncteur electrique, muni d'une chambre d'extinction d'arc a ecrans dielectriques | |
FR2604026A1 (fr) | Disjoncteur possedant une structure perfectionnee d'extinction d'arc | |
CH639306A5 (fr) | Outil de soudage. | |
FR2777111A1 (fr) | Disjoncteur | |
FR2537774A1 (fr) | Fusibles electriques a extinction magnetique de l'arc | |
EP0871194B1 (fr) | Bilame usinée | |
EP2411995B1 (fr) | Déclencheur magnétothermique | |
EP2553705A1 (fr) | Fusible et interrupteur combiné comprenant un tel fusible | |
EP0831510B1 (fr) | Dispositif de déclenchement thermique pour appareil de protection | |
EP0635859B1 (fr) | Disjoncteur pourvu d'un mécanisme de commande à accrochage piloté par un propulseur électromagnétique | |
EP0996959B1 (fr) | Appareil de coupure electrique pour installation electrique a basse tension alternative | |
EP3161850B1 (fr) | Déclencheur magnétothermique | |
EP0080393B1 (fr) | Dispositif de bilame placé en série avec une chaufferette | |
EP3185275B1 (fr) | Dispositif d'assemblage d'un bilame et d'une pièce formant support de ce bilame et appareil de protection électrique le comportant | |
EP1505619B1 (fr) | Mécanisme de serrure amélioré pour disjoncteur et disjoncteur incorporant un tel mécanisme de serrure | |
EP1282146B1 (fr) | Dispositif pour l'extinction d'un arc électrique | |
EP1850361B1 (fr) | Actionneur sensible à une surintensité électrique et à déclenchement rapitde, et application | |
FR2553928A1 (fr) | Bilame a chauffage mixte pour declencheur thermique d'un appareil de coupure | |
FR2669144A1 (fr) | Assemblage d'un bilame pour appareil de coupure de courant et d'une piece servant de support au bilame. | |
EP2065913B1 (fr) | Dispositif de déclenchement thermique pour appareil électrique de protection de ligne | |
FR2679318A1 (fr) | Appareil de chauffage d'eau, notamment bouilloire, comportant un dispositif de regulation et de rupture d'alimentation. | |
FR2779582A1 (fr) | Dispositif de protection de ligne a coupure integree | |
FR2722609A1 (fr) | Disjoncteur electrique a actionneur electromagnetique pour calibres eleves | |
FR2608833A1 (fr) | Procede pour relier des parties conductrices d'un composant electrique d'interrupteur |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19970422 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB IT LI NL PT SE |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
17Q | First examination report despatched |
Effective date: 19990114 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AKX | Designation fees paid |
Free format text: AT BE CH DE ES FR GB IT LI NL PT SE |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES FR GB IT LI NL PT SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19990728 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19990728 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 19990728 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19990728 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19990728 |
|
REF | Corresponds to: |
Ref document number: 182717 Country of ref document: AT Date of ref document: 19990815 Kind code of ref document: T |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REF | Corresponds to: |
Ref document number: 69700359 Country of ref document: DE Date of ref document: 19990902 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19990824 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19991029 |
|
REG | Reference to a national code |
Ref country code: PT Ref legal event code: SC4A Free format text: AVAILABILITY OF NATIONAL TRANSLATION Effective date: 19990811 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000430 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
BERE | Be: lapsed |
Owner name: S.A. HAGER ELECTRO Effective date: 20000430 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20001031 |
|
REG | Reference to a national code |
Ref country code: PT Ref legal event code: MM4A Free format text: LAPSE DUE TO NON-PAYMENT OF FEES Effective date: 20001031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010409 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010508 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010508 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20010409 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20160330 Year of fee payment: 20 |