WO2023214941A1 - Appareil de protection sur la base d'un fusible doté d'un élément de fusion, l'insertion d'un faux fusible étant empêchée - Google Patents

Appareil de protection sur la base d'un fusible doté d'un élément de fusion, l'insertion d'un faux fusible étant empêchée Download PDF

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Publication number
WO2023214941A1
WO2023214941A1 PCT/SI2022/000007 SI2022000007W WO2023214941A1 WO 2023214941 A1 WO2023214941 A1 WO 2023214941A1 SI 2022000007 W SI2022000007 W SI 2022000007W WO 2023214941 A1 WO2023214941 A1 WO 2023214941A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuse
casing
cover
electric
seat
Prior art date
Application number
PCT/SI2022/000007
Other languages
English (en)
Inventor
Matej KAVSEK
Said BEGANOVIC
Original Assignee
Eti Elektroelement, D.O.O.
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
Priority claimed from SI202200071A external-priority patent/SI26360A/sl
Application filed by Eti Elektroelement, D.O.O. filed Critical Eti Elektroelement, D.O.O.
Publication of WO2023214941A1 publication Critical patent/WO2023214941A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/24—Means for preventing insertion of incorrect fuse
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/54—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
    • H01H85/545—Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers with pivoting fuse carrier

Definitions

  • the invention refers to a protective appliance on the basis of a fuse with a melting member, which is prevented against insertion of a false fuse and consequences, which could result from such action.
  • a protective appliance on the basis of a fuse with a melting member, which is prevented against insertion of a false fuse and consequences, which could result from such action.
  • such invention belongs to electricity, namely to basic electric components, and in particular to protective appliances, in which the current is flowing through a part of melting material, so that the electric circuit, when exposed to overcurrent, is interrupted due to displacement of melted material, wherein the invention in particular refers to casings used in such appliances, and is included in the Class H 01 H 85/165.
  • the purpose of the invention is to prevent insertion of an inappropriate single fuse into a protective appliance, which is adjusted for receiving of a double i.e. a tandem fuse, since such irregularity would lead to essential exceeding of a nominal capacity of the fuse with the possibility of burning of arc due to insufficient contact pressure during insertion thereof, which may be later also followed by unnecessary interruption of the electric current due to insufficient nominal value of the fuse, despite to regular operation of the electric circuit.
  • a protective appliance on the basis of a fuse with a melting member is disclosed in EP 0 718 862 Al and comprises a casing with a cover, into which a suitable fuse with a melting member is insertable.
  • Said casing generally consists of an electric insulating material and is on its rear side furnished with a seat and arresting seat, which are arranged for mounting said casing on a standardized connecting ledge.
  • the casing is opened on its front side and is adjusted for receiving of a cover, which is on the one hand pivotally attached to the casing and on the other hand matches the casing, so that the cover may be either pivoted away from the casing in order to allow access towards to the interior of the casing, or may also be pivoted in opposite direction towards the casing, upon which the casing is closed and the cover matches the casing.
  • two electric conductive connectors are foreseen on the external surface of the casing, via which the protective appliance can be integrated into an electric circuit.
  • Said cover is adapted for receiving of an electric resistance fuse with a melting member, namely a standardized fuse with a cylindrically tubular and electrically insulating ceramic body, which in its both terminal portions closed by means of electric conductive cups, which are electrically interconnected with each other via a melting member, which extends along the interior of said tubular fuse body.
  • a melting member namely a standardized fuse with a cylindrically tubular and electrically insulating ceramic body, which in its both terminal portions closed by means of electric conductive cups, which are electrically interconnected with each other via a melting member, which extends along the interior of said tubular fuse body.
  • Two electrically conductive connectors are available within said casing, between which the fuse is arrestingly insertable in the area of said electric conductive cups thereof, and which are each per se electrically connected with corresponding electrically conductive terminals on the external surface of the casing, and are thus connectable with the electric circuit.
  • Said terminals may be formed of semicircularly bent metallic bands or of a metallic band, which is bent in form of letter U, which is disclosed e.g. in US 6,692,315 Bl, or as a pair of elastically mounted rests, which are deflectable apart from each other as it is disclosed in WO 2007/131868 Al.
  • Said electric resistance fuse is meant as one of standardized fuses pursuant to IEC 60947-1:2004 (E) or 60947-1 :2020 standard, and one of suitable embodiments is also disclosed in WO 2021/101453 Al.
  • a relatively bulky casing is required, which is however foreseen for inserting of a relatively small fuse with correspondingly low nominal capacity.
  • certain amount of heat is generated, which is however practically neglectable and cannot lead to essential increasing of temperature within the interior of the casing, and in particularly not in such extend that overheating could result in structural changes in the material of the casing, which could reduce insulating properties of the casing as such.
  • the lateral walls of the casing can be flat, smooth and can extend parallel with each other, which allows placement of numerous casings adjacent to each other on the same connecting ledge.
  • the width of the casing depends on diameter of the fuse inserted therein, and there is always a tendency on reducing the casing width, since the protective appliance then requires less space on said connecting ledge and more protective appliances and more fuses can then be installed on the same connecting ledge.
  • Such fuses are in parallel electrically connected with each other, so that the nominal capacity of such tandem fuse corresponds to nearly a double nominal capacity of a single fuse, but such tandem fuse can despite to that be inserted into a casing, the width of which corresponds to the width of a casing, which is adjusted to a diameter of a single fuse in said tandem. Consequently, when compared with using of a single fuse, the benefit of using said tandem fuse is placing of a fuse with practically double nominal capacity into a casing of equal width as the width of the casing suitable for using a single fuse.
  • the present invention refers to a protective appliance on the basis of a fuse with a melting member, which is prevented against insertion of a false fuse.
  • Such protective appliance generally comprises a casing, a cover and a fuse.
  • a box-shaped casing is opened on its front side and consists of an electric insulating material, and is moreover on its rear wall furnished with an arresting seat, which is suitable for attachment of said casing onto a connecting ledge or similar mounting means.
  • Lateral walls of said casing are arranged parallel with each other, and two apart from each other spaced electrically conductive terminals are foreseen on the external surface of the casing in the area of said front side thereof, by means of which said protective appliance is connectable with suitable electric conductors and is such enabled to be integrated in an electric circuit.
  • Two electric conductive connecting seats are foreseen within the interior of said casing adjacent to said rear wall, and are adapted for insertion of an electric fuse therebetween, so that a required contact pressure between each of them and said fuse can be established, wherein each of said connecting seats is per se electrically connected with one of said electric conductive terminals on the front side of the casing, via which then also the fuse is also integrated in said electric circuit.
  • Said cover also consists of an electric insulating material and is on the one hand adapted for tightly matched closing of said opened front side of the casing, while on the other hand, said cover is also adapted for receiving of said fuse.
  • Said cover is pivotally attached to the casing in a pivot point, which is arranged on the one terminal area on the front side of the casing, so that the cover is pivotal relatively to the casing at a pre-determined angle, which is sufficient to allow insertion or removal of said fuse, wherein the geometric axis, around which said cover is pivotal relatively to said casing, extends perpendicularly with respect to said parallel with each other arranged lateral walls of the casing.
  • Said cover is on its other terminal area, i.e.
  • said cover is furnished with a seat, which is suitable for placement of the fuse there-into, and which is due to ensuring of required electric insulating properties arranged at a sufficient distance apart from said front surface and simultaneously also at a sufficient distance apart from said pivot point between the cover and the casing, but also in a suitable position in the area sufficiently close to said connecting seats, so that on the one hand, in opened state of the cover, namely when the cover is pivoted around said pivot point in a direction away from the casing, an electric fuse can be either inserted into said seat on the cover, or also removed there-from, while on the other hand, when said cover is closed i.e.
  • Said fuse is generally either a single fuse, comprising a cylindrical tubular body consisting of an electro-thermally insulating material, which is on its both terminal portions closed by two terminally blinded tubular caps, which are electrically connected with each other via a melting member, which extends along the interior of said tubular body and is preferably surrounded with a granulated arcextinguishing material, or a tandem fuse, which consists of two single fuses of equal shape and nominal capacities with regard to each other, which are mechanically and in a non-detachable manner connected with each other in their mutually parallel longitudinal alignment and in position, in which their geometric axles extend parallel with each other, wherein said fuses are electrically in parallel connected with each other.
  • said seat on said cover of the protective appliance is furnished with two chambers and each one of these chambers is adjusted for receiving of a single cylindrical fuse, wherein on the one hand both longitudinal axles of said chambers are arranged parallel with each other, and on the other hand, both of them are arranged within the same central plane between both lateral walls of the casing, so that the first chamber within the cover is located closer to the front side of the casing and the second chamber is located closer to the rear wall of the casing.
  • Such conceived cover is in the area of said chambers capable to receive either a single fuse, the longitudinal geometric axis of which is aligned with a corresponding geometric axis of the one of said chambers, or a tandem fuse, the longitudinal geometric axles of which are aligned with geometric axles of said chambers.
  • Both electrically conductive resting seats are arranged adjacent to the rear wall of the casing and in such manner that each one of said seats is able to stay in contact with a corresponding electric conductive cap of just one fuse, which is placed within the second chamber of the seat in the cover, while each potential electric contact between said electrically conductive resting seats and the fuse, which is placed within the first chamber of the seat closely to the front side of the casing, is physically disabled.
  • a resilient selecting means is mounted within the casing and is arranged on the side oppositely to the pivot point and, when taking into consideration the cover in a closed position thereof, in the area between both chambers of the cover, wherein said selecting means protrudes inside i.e.
  • the first chamber is on its side, which is located closely to the pivot point, furnished with a seat, which is adjusted for receiving of that cap of the fuse, which is to be inserted into the first chamber, which is arranged closely to the front side of the casing.
  • said cover is furnished with a sloped resting support, which is adjusted to the circumferential shape of the fuse cap and is faced towards the interior of the casing, and is therefore by closing the cover capable to support the fuse and press it towards the interior of the casing.
  • Fig. 1 presents a protective appliance according to the invention, with closed cover and with a tandem fuse inserted therein, in isometric view;
  • Fig. 2 is a protective appliance in a cross-section along the plane A - A in Fig. 1;
  • Fig. 3 presents a protective appliance according to Fig. 2 in its state, where the cover is open and inserting of a tandem fuse is performed;
  • Fig. 4 presents a protective appliance according to Figs. 1 - 3, however upon inserting of an inappropriate single fuse and closing the cover;
  • Fig. 5 is a cross-section along the plane B - B in Fig. 4;
  • Fig. 6 similarly like Figs. 4 and 5 presents a protective appliance according to the invention upon inserting of an inappropriate single fuse, but prior to closing the cover.
  • a protective appliance 100 on the basis of a fuse 3, 3' with a melting member generally comprises a casing 1, a cover 2 and a fuse 3, 3’.
  • said appliance 100 is adapted for insertion of a tandem fuse 3 (Figs 2 and 3), which will be in more detail described later-on, and provides for reliable protection against insertion of an inappropriate single fuse 3’ (Figs. 2 - 4).
  • Said casing 1 is box-shaped and is opened on its front side 11 and adapted for receiving a cover 2, which should tightly match said casing 1.
  • the casing 1 consists of an electric insulating material, and is on its rear wall 12 furnished with an arresting seat 120, which is suitable for attachment of said casing 1 onto a connecting ledge or similar mounting means, selected among numerous known and widely used attaching means.
  • Both lateral walls 13, 14 of said casing 1 are arranged parallel with each other, which allows placing of several casings 1 one adjacent to the other onto the same connecting ledge, which in the practice leads to the possibility of systematic and transparent arrangement of several casings 1 of appliances 100 for protection of various circuits by simultaneously rational exploitation of the space, which is fur such purpose available on a disposable switchbox or a switch panel.
  • two electric conductive connecting seats 16, 17 are foreseen in the interior of said casing 1 adjacent to said rear wall 12, and are adapted for insertion of an electric fuse 3, 3’ there-between, wherein also a required contact pressure between each of them and said fuse 3, 3’ needs to be established, so that each of said connecting seats 17, 18 is per se electrically connected with one of said electric conductive terminals 15, 16 on the front side 11 of the casing 1, via which then also the fuse 3, 3’ can be integrated into the belonging electric circuit.
  • Said a cover 2 generally also consists of an electric insulating material and is on the one hand adapted for tightly matched closing of said opened front side 11 of the casing 1, while on the other hand it is also adapted for receiving of said fuse 3, 3’.
  • said cover 2 is attached to the casing 1 pivotally at a pre-determined angle around a pivot point 21, which allows insertion or removal of the fuse 3, 3’.
  • Said pivot point is arranged on the one terminal area on the front side 11 of the casing 1, wherein the geometric axis 210, around which said cover 2 is pivotal relatively to said casing 1, extends perpendicularly with respect to said parallel with each other arranged lateral walls 13, 14 of the casing 1.
  • said cover 2 is on its other terminal area, i.e.
  • each of said casings 1 can be by means of said handling grip 22 pivoted around said geometric axis 210 extending through said pivot point 21 either in a direction away from the casing 1 (Figs 3 and 6) due to insertion or removal of the fuse 3, 3’, or in a direction towards the casing 1 in a position (Figs 1, 2, 4, 6), in which the cover 2 is tightly matching placed over the casing 1, which is herewith closed, so that any access to the electric conducting components within the casing 1 is impossible.
  • said cover 2 is furnished with a seat 23, which is suitable for placement of the fuse 3, 3’ there-into and is due to providing each required electric insulating properties arranged at a sufficient distance apart from said front surface 20 and simultaneously also at a sufficient distance apart from said pivot point 21 between the cover 2 and the casing 1.
  • said seat 23 is also arranged in a suitable position closely to said connecting seats 17, 18, so that on the one hand in opened state of the cover 2, namely when the cover 2 is pivoted around said pivot point 21 away from the casing 1, an electric fuse 3, 3’ can be either inserted into said seat 23 on the cover 2 or also removed there-from.
  • the cover 2 is closed i.e.
  • said fuse 3, 3’ is an electric fuse, in which a base component is a single standardized cylindrical fuse 3’, comprising a cylindrical tubular body 31 , which is made of an electro-thermally insulating material and is on its both terminal portions closed by two terminally blinded tubular caps 32’, 32”, which are electrically connected with each other via a melting member, which extends along the interior of said tubular body 32 and is preferably surrounded with a granulated arc-extinguishing material, in particular silica granulate.
  • a base component is a single standardized cylindrical fuse 3’, comprising a cylindrical tubular body 31 , which is made of an electro-thermally insulating material and is on its both terminal portions closed by two terminally blinded tubular caps 32’, 32”, which are electrically connected with each other via a melting member, which extends along the interior of said tubular body 32 and is preferably surrounded with a granulated arc-extinguishing material, in particular silica granulate.
  • tandem fuse 3 (Figs 2 and 3), which consists of two single fuses 3’, which are however in the area of said caps 32’, 32” mechanically and in a non-detachable manner interconnected with each other in such a position that both fuses 3’ are aligned in the longitudinal direction, so that their overall length in such assembled state remains unchanged and their longitudinal axles 30’, 30” extend parallel with each other, while in the electric context both single fuses 3’ in such established tandem fuse 3 are in parallel electrically connected with each other.
  • the protective appliance 100 excels in that said seat 23 on said cover 2 is furnished with two chambers 23’, 23”, and each one of these chambers 23’, 23” is adjusted for receiving of a single cylindrical fuse 3’, wherein on the one hand both longitudinal axles 230’, 230” of said chambers 23’, 23” are arranged parallel with each other, and on the other hand both of them are arranged within the same central plane between both lateral walls 13, 14 of the casing 1.
  • the first chamber 23’ within the cover 2 is located closer to the front side 11 of the casing 1, while the second chamber 23” is located closer to the rear wall 12 of the casing 1.
  • said cover 2 is in the area of said chambers 23’, 23” capable to receive either a single fuse 3’, the longitudinal geometric axis 30’ of which is aligned with a corresponding geometric axis 230’, 230” of the one of said chambers 23’, 23”, or two single fuses 3’, the longitudinal geometric axles 30’, 30” of which are aligned with corresponding geometric axles 230’, 230” of said chambers 23’, 23”, or a tandem fuse 3, the longitudinal geometric axles 30’, 30” of which are also aligned with geometric axles 230’, 230” of said chambers 23’, 23”.
  • a tandem fuse 3 is planned to be used, and said electric conductive resting seats 17, 18 are arranged adjacent to the rear wall 12 of the casing 1 and in such manner that each one of said seats 17, 18 is able to stay in contact with a corresponding electric conductive cap 32’, 32” of those single fuse 3’ within the tandem, which is placed within the second chamber 23” of the seat 23 in the cover 2, while each potential electric contact between said electrically conductive resting seats 17, 18 and the fuse 3, 3’, which is placed within the first chamber 23’ of the seat 23 closely to the front side 11 of the casing 1, is physically disabled.
  • a resilient selecting means 190 is mounted within the casing 1 and is arranged on the side 19 oppositely to the pivot point 21 and, when taking into consideration the cover 2 in its closed position, in the area between both chambers 23’, 23” of the cover 2, wherein said selecting means 190 protrudes inside i.e. towards the interior of the casing 1.
  • Said selecting means 190 although resilient, is also sufficiently strong, and its resiliency is determined in such a manner, that by closing of said cover 2, when a corresponding cap 32” of a tandem fuse 3, which should regularly occupy both chambers 23’, 23” of said cover 2, abuts the selecting means 190, by which the resilient selecting means 190 is deflected. Consequently, the cap 32” of the fuse 3 in the second chamber 23”, which protrudes towards the resilient selecting means 190, is allowed to enter into the corresponding electric conductive resting seat 18.
  • the first chamber 21’ is on its side, which is located closely to the pivot point 21, furnished with a seat 231, which is adjusted for receiving of that cap 32’, 32” of the fuse 3, 3’, which is to be inserted into the first chamber 23’, which is arranged closely to the front side 11 of the casing 1.
  • the invention further provides that in the area of the first chamber 23’, into which the oppositely to the pivot point 21 located fuse cap 32’, 32” is to be rest, said cover 2 is furnished with a sloped resting support 202, which is adjusted to the circumferential shape of the fuse cap 32’, 32” and is faced towards the interior of the casing 1, and is therefore by closing the cover 2 capable to support the fuse 3’, 3 ’ ’ and press it towards the interior of the casing 1.

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Abstract

L'invention fait référence à un appareil de protection (100) sur la base d'un fusible (3, 3') doté d'un élément de fusion, qui est approprié pour recevoir un fusible en tandem double (3') avec des éléments de fusion. L'objectif de l'invention est d'empêcher l'insertion d'un fusible unique inapproprié (3') dans un appareil de protection (100), ce qui conduirait à un dépassement essentiel d'une capacité nominale du fusible (3, 3') avec la possibilité de brûler un arc en raison d'une pression de contact insuffisante entre les capuchons de fusible (32', 32'') et les sièges de repos électro-conducteurs associés (17, 18) à l'intérieur du boîtier d'appareil (1). À cet effet, un siège (23) est prévu à l'intérieur du couvercle (2), qui est conçu pour recevoir un fusible (3, 3') et comprend deux chambres (23', 23''), qui sont chacune conçues pour recevoir un fusible unique (3'). Lesdits sièges de repos (17, 18) sont agencés de manière adjacente à la paroi arrière (12) du boîtier (1), de sorte que seul le fusible (3, 3'), qui est inséré à l'intérieur de la chambre adjacente (23'') peut être amené en contact électrique avec ceux-ci, mais pas le fusible (3, 3'), qui est inséré à l'intérieur de l'autre chambre (21').
PCT/SI2022/000007 2022-05-06 2022-12-12 Appareil de protection sur la base d'un fusible doté d'un élément de fusion, l'insertion d'un faux fusible étant empêchée WO2023214941A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SI202200071A SI26360A (sl) 2022-05-06 2022-05-06 Zaščitni sklop na osnovi električne uporovne varovalke s talilnim elementom
SIP-202200071 2022-05-06
SIP-202200074 2022-05-10
SI202200074A SI26361A (sl) 2022-05-06 2022-05-10 Proti vstavljanju neustrezne varovalke zavarovan zaščitni sklop na osnovi električne uporovne varovalke s talilnim elementom

Publications (1)

Publication Number Publication Date
WO2023214941A1 true WO2023214941A1 (fr) 2023-11-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SI2022/000007 WO2023214941A1 (fr) 2022-05-06 2022-12-12 Appareil de protection sur la base d'un fusible doté d'un élément de fusion, l'insertion d'un faux fusible étant empêchée

Country Status (1)

Country Link
WO (1) WO2023214941A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5616054A (en) * 1995-10-30 1997-04-01 Gould Electronics Inc. Fuse holder
US20050285710A1 (en) * 2004-06-28 2005-12-29 Wohner Gmbh & Co. Kg Fuse switch
EP2385541A1 (fr) * 2010-05-06 2011-11-09 Wöhner GmbH & Co. KG Elektrotechnische Systeme Dispositif de réception d'une sécurité et commutateur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5616054A (en) * 1995-10-30 1997-04-01 Gould Electronics Inc. Fuse holder
US20050285710A1 (en) * 2004-06-28 2005-12-29 Wohner Gmbh & Co. Kg Fuse switch
EP2385541A1 (fr) * 2010-05-06 2011-11-09 Wöhner GmbH & Co. KG Elektrotechnische Systeme Dispositif de réception d'une sécurité et commutateur

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