Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H37/00—Thermally-actuated switches
  • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
  • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
  • H01H37/767—Normally open
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/66—Structural association with built-in electrical component
  • H01R13/68—Structural association with built-in electrical component with built-in fuse
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/66—Structural association with built-in electrical component
  • H01R13/70—Structural association with built-in electrical component with built-in switch
  • H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
  • H01R13/7137—Structural association with built-in electrical component with built-in switch the switch being a safety switch with thermal interrupter

Definitions

• the present invention relates to a thermal monitoring device for electrical installation and more particularly to a device sensitive to heating undergone by a connection.
• the present invention aims to remedy these drawbacks by proposing a thermal monitoring device which is sensitive to heating produced by a defective connection.
• the present invention thus relates to a device for thermal monitoring of a connection of an electrical installation, characterized in that it comprises a first connection element in thermal and electrical relation with a connection to be monitored, a second connection element in electrical connection with the earthing of the installation, electrical connection means which combine the two connecting means, and which are capable of occupying two states, namely a first state or normal operating state in which they are electrically insulating and a second state or rupture state, in which they become electrically conductive when they reach a critical temperature
• the electrical connection means are such that when they reach the critical temperature they irreversibly change from a non-conductive state to a conductive state
• connection means may consist of a conductive piston in electrical connection with the first connection, which is urged by elastic means towards the second connection, against ... retaining means fused capable of melting as soon as the connection to be monitored reaches the critical temperature
• connection means may also consist of an insulating element of heat-shrinkable type, one face of which, called the front, is in contact with the first connection and the second face, called the back, is in contact with the second connection, this element being such that, when the temperature of the connection to be monitored reaches the critical temperature, it retracts thus exposing a contact surface of the first connection with the second
• the thermal monitoring device comprises an elastic and conductive feeler which is electrically connected to a second connecting element and one of which 01/48774
• the thermal monitoring device can be arranged in parallel with the terminals of the connection to be monitored, but also be completely integrated into it.
• the first connecting element will be constituted by a mechanical component of the connection.
• Figure 1 is a longitudinal and cross sectional view of a first embodiment of a thermal monitoring device according to the invention
• Figure 2 is a longitudinal and cross sectional view of a second embodiment work of a thermal monitoring device according to the invention
• FIG. 3 is a view in longitudinal and transverse section of a third embodiment of a thermal monitoring device according to the invention which is integrated into the connection to be monitored
• Figure 4 is a cross-sectional view of a fourth embodiment of a thermal monitoring device according to the invention which is integrated into the connections to be checked from a power outlet
• the thermal monitoring device shown in Figure 1 consists of a housing 1 made of an insulating material such as for example a plastic material, which is pierced at a first end of a cylindrical housing 3 which is extended towards the other end by a cylindrical housing 5 of the same axis and of larger diameter.
• the second end of the housing 1 has a radial boss 7 pierced with a radial orifice 9.
• the housing 3 makes it possible to receive an electric wire 11 whose conductor 12 is thermally and electrically connected with a connection to be controlled located in the immediate vicinity and not shown on the drawing.
• the sheath 13 of the electric wire 11 is removed over a certain length in order to release the conductor 12, which receives a metal lug 14 which is fixed to it by crimping.
• This terminal ends with an end 15 folded transversely.
• the end 15 is pierced with an axial orifice 17 which receives a rod 19 of a piston 21, this piston being provided with a head 23 of larger diameter and with an
• Part 25 is surrounded by a helical compression spring 27 which, on the one hand, is supported on the end part 15 of the terminal 3 and, on the other hand, on the head 23 of the piston 21, so that it exerts on the head of this piston a force in the direction of the arrow F.
• the free end of the rod 19 of the piston 21 is hollowed out with a circular groove 29 in which a rod of fusible material 31 is deposited.
• This fusible material 31 maintains the piston 21 in position against the compression force exerted on the head 23 thereof by the spring 27, so that, as soon as the holding force provided by the rod 31 the piston 21 is expelled in the direction of the arrow F.
• the fusible material constituting the rod 31 is such that at a given temperature, called the critical temperature, the stress exerted by the spring 27 on the piston head 23 is greater than the holding force exerted by the fuse link so that the piston is released
• the second end of the housing 1 receives a metal part 35 of cylindrical shape which comprises an axial housing 37 receiving an electrical conductor 39 which is connected to the installation earthing.
• the element 35 is pierced with a threaded hole receiving a clamping screw 36 qu_. takes place in the recess 9 of the boss 7, and which ensures the connection of the part 35 with the conductor 39
• Maintaining the position of the part 35 is provided on the one hand by a recess 41 at its upper part in a corresponding recess provided in the housing 1 and by elastic bosses 43 provided at the end thereof.
• the operation of the thermal monitoring device is established as described below.
• the connection not shown in the drawing, to which the electrical conductor 12 is connected, the heat thus produced is transmitted by the conductor and the terminal 13 to the hot-melt rod 31
• the rod 31 ensures the maintenance of the piston 21 against spring stress 27 From as this temperature increases and reaches the critical temperature, the fusible ring 31 no longer ensures its holding function, and the spring 27 pushes the piston 21 in the direction of the arrow F to come 01/48774
• the box 44 is made of a non-material conductor and comprises a front cylindrical part 45 and a rear part forming boss 46
• part 45 comprises an axial cylindrical housing 3 which receives one end of an electric wire 11 whose conductor 12 is connected to an electric connection not shown on the drawing and located close to the device
• the end of the electric wire 11 is provided with a terminal 47 which is crimped on 1 end of the conductor 12 of the wire 11
• the terminal 47 has a front and upper end which extends towards 1 inside of the housing 3 and abuts against an internal protuberance 49 of the housing 44
• the terminal 47 is blocked on its rear part by elastic stops 51
• the internal face of the terminal 47 is 01/48774
• a sheet 48 of heat-shrinkable type that is to say a sheet which, when brought to a determined temperature shrinks
• the internal part of the boss 46 is hollowed out with a recess 53 which receives a metal part 55, of complementary shape, which is hollowed out from a longitudinal housing
• connection between the part 55 and the conductor 59 is ensured by a clamping screw 61
• the front and bottom part of the element 55 is hollowed out with a cavity 63 which receives a metallic element elastic 65 which is curved radially in the direction of the terminal 47, so that its free end comes into contact. with the outer face of the heat-shrinkable sheet 48.
• this thermal monitoring device In normal operation, that is to say when the connection to be monitored, not shown in the drawing, is in good condition, and therefore the heat-shrinkable sheet 48 does not become entangled, due to its insulating qualities, prevents contact of the element 65 with the terminal 47
• the heat produced is transmitted by the conductor 12 to the terminal 47 and the latter has the heat-shrinkable sheet 48 which, when the heating temperature reaches the critical temperature, retracts sufficiently so that the free end of the element (.5 01/48774
• connection is connected to the ground causing the current to be cut upstream by the tripping of the difrential circuit breaker
• a thermal monitoring device could be produced. Which is integrated into the connection itself.
• FIG. 80 which comprises at its base a parallelepipedic cavity ⁇ l in which a domino is embedded with elastic support.
• metal 82 of complementary shape which is pierced with an axial housing 84 intended for .
• the body 80 has an upper cavity in which is housed a cylindrical metal lug 85 perc ed housing axial 86 intended to receive a conductor 29 J which is held by a screw 83 J this conductor being connected to the earthing of the installation
• a metal spring leaf 88 is placed at the base of the terminal 85 which is in contact by its free end with the upper face of the domino 82
• the upper face of the latter is covered with a heat-shrinkable sheet 90 which, in normal operation of the connection, provides electrical insulation between the domino 82 and the blade spring 88
• the elastic force of this leaf spring can be improved by LE contact with a stop 94 provided in the body 80 which exerts pressure on this spring Under these conditions, as before, when heating of the domino 82 connections causes heating, the heat-shrinkable film 90 contracts thus leaving free contact with the leaf spring 88 with the upper face of the domino 82, thereby
• FIG. 4 shows an alternative embodiment of the invention in which the thermal monitoring device is integrated into an electrical outlet
• the thermal monitoring device is here integrated into the connection during crimping or cleaning of the elements 66 and 67, and consists of an elastic feeler 10 conductor 70 whose shape and the attachment of the elements 66 keep it in contact on the grounding terminal 64.
• an elastic feeler 10 conductor 70 whose shape and the attachment of the elements 66 keep it in contact on the grounding terminal 64.
• a heat-shrinkable film 77 has been placed or other, so that at normal temperature, it electrically isolates the probe 70 and the grounding terminal 64.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Details Of Connecting Devices For Male And Female Coupling (AREA)
• Fuses (AREA)
• Control Of Resistance Heating (AREA)
• Control Of Combustion (AREA)
• Control Of Temperature (AREA)
• Connections Arranged To Contact A Plurality Of Conductors (AREA)
• Polyesters Or Polycarbonates (AREA)
• Burglar Alarm Systems (AREA)
• Push-Button Switches (AREA)
• Spinning Or Twisting Of Yarns (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9553890

Family Applications (1)

Country Status (11)

Families Citing this family (4)

Family Cites Families (14)

• 1999
  • 1999-12-28 FR FR9916556A patent/FR2803122B1/fr not_active Expired - Fee Related
• 2000
  • 2000-12-26 WO PCT/FR2000/003684 patent/WO2001048774A1/fr active IP Right Grant
  • 2000-12-26 CA CA002395930A patent/CA2395930C/fr not_active Expired - Fee Related
  • 2000-12-26 AT AT00992206T patent/ATE251337T1/de not_active IP Right Cessation
  • 2000-12-26 CN CNB008187401A patent/CN100349239C/zh not_active Expired - Fee Related
  • 2000-12-26 EP EP00992206A patent/EP1243010B1/de not_active Expired - Lifetime
  • 2000-12-26 AU AU28592/01A patent/AU2859201A/en not_active Abandoned
  • 2000-12-26 ES ES00992206T patent/ES2208467T3/es not_active Expired - Lifetime
  • 2000-12-26 US US10/168,992 patent/US6809917B2/en not_active Expired - Lifetime
  • 2000-12-26 DE DE60005713T patent/DE60005713T2/de not_active Expired - Lifetime
  • 2000-12-26 PT PT00992206T patent/PT1243010E/pt unknown

Non-Patent Citations (1)

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