EP0110758B1 - Relais thermique - Google Patents

Relais thermique Download PDF

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Publication number
EP0110758B1
EP0110758B1 EP83402162A EP83402162A EP0110758B1 EP 0110758 B1 EP0110758 B1 EP 0110758B1 EP 83402162 A EP83402162 A EP 83402162A EP 83402162 A EP83402162 A EP 83402162A EP 0110758 B1 EP0110758 B1 EP 0110758B1
Authority
EP
European Patent Office
Prior art keywords
case
switch
link
movement
thermal relay
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
Application number
EP83402162A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0110758A1 (fr
Inventor
Joseph Lebrun
Jacques Landron
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.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
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 La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Priority to AT83402162T priority Critical patent/ATE19324T1/de
Publication of EP0110758A1 publication Critical patent/EP0110758A1/fr
Application granted granted Critical
Publication of EP0110758B1 publication Critical patent/EP0110758B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
    • H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements
    • 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
    • H01H2071/109—Operating or release mechanisms with provisions for selecting between automatic or manual reset
    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings

Definitions

  • the invention relates to a thermal relay comprising a first housing in which are arranged current monitoring bimetals capable of communicating their movements to a strip and a second removable housing associated with the first so that the strip can communicate with a switch normally closed safety switch and placed inside a working position for which this switch is open.
  • relays are widely used in electrical engineering to protect motors in combination with contactors placed between them and the electrical supply network.
  • thermal relays consist of two detachable sub-assemblies, namely a first housing containing bimetallic strips and a second housing containing a safety switch, it is very easy to assemble the same switch housings with different bimetallic housings according to the power of the motor for which the relay is intended.
  • the invention therefore proposes to provide a thermal relay in which two detachable housings are used, and where measures will be taken so that the dimensions are reduced to an order of magnitude close to or less than that of the associated contactor, while maintaining accessibility compatible with series mounting, excellent cooperation between the moving parts of the device, electrical insulation corresponding to that of the contactor and effective protection against the environment.
  • thermal relays whose general constitution corresponds to that which is mentioned above, but where the arrangement of the moving parts does not lend itself to a significant reduction in dimensions, while the presence of a single window for the introduction of these parts makes it difficult to mount them inside the switch housing.
  • all of the adjustment members of the thermal relay are not presented on the same upper face, which indirectly increases the overall dimensions insofar as a space, necessary for their access, must be left empty between the relay. and any neighboring devices.
  • the targeted result is achieved thanks to the fact that this switch, the movement transmission device, the thermal compensation device are arranged in a second housing having a small width measured in the direction of movement of the strip and having on several faces of the access windows which are closed off by partitions belonging to the first housing.
  • a thermal relay 1 performs a protection function of a motor M in the context of a circuit visible in FIG. 7 and using a contactor 90 having an electromagnet coil 93 which controls the closing and opening of power switches 96, 97, 98 to establish a connection with the RST network.
  • An auxiliary contact 95 is also actuated by this electromagnet.
  • the thermal relay has input power terminals 100, 101, 102 connected to corresponding terminals of the contactor and output power terminals 103, 104, 105, connected to the motor, and between which are arranged heaters 3 ′, 4 ', 5' which produce the deformation of the bimetallic strips 3, 4, 5 placed in their vicinity; these heaters can also be part of bimetallic strips.
  • a safety switch 57 normally closed, is opened by the movement of the bimetallic strips when they reach a determined temperature, this temperature being reached at the end of a time interval which is a function of their previous temperature, of the ambient temperature and the intensity of the current flowing in the heaters.
  • the coil of the electromagnet 93 is connected in series with the safety switch 57 and with a commissioning switch 94 between the + and - poles of a source and at l using terminals 92, 91, 70, 71.
  • the auxiliary contact 95 which is connected in parallel to the switch 94 excites the electromagnet when the switch 94 ceases to be actuated.
  • the switch 57 opens and the electromagnet, for lack of excitation, opens the power switches 96, 97 , 98 to interrupt the motor supply.
  • thermal relay 1 The operation of the thermal relay 1, as well as the choice of certain operating modes, the adjustment of the nominal current of the motor, and the adjustment of the relay in the factory are obtained using the parts visible in FIG. 1b, where we note that this relay, which is presented externally in the form of an envelope 2 uses two boxes 2 'and 2 "which are associated.
  • the box 2 "contains the bimetallic strips 3, 4, 5, their heaters, their corresponding terminals 100, 101, 102, 103, 104, 105 and a motion transmission strip 9 which receives the deformations of these bimetallic strips on pushers 6, 7, 8.
  • the housing 2 'contains the safety switch 57, the corresponding terminals 70, 71, as well as a set of members which will be described below.
  • levers 14 and 17 constitute a movement transmission mechanism 77 which transmits the movement of the strip to a device. neutral point 30.
  • a point 24 of the lever 14 must meet a fulcrum 23 belonging to a device for compensating the ambient temperature 19.
  • the fulcrum 23 is represented by the end of a bimetallic strip 22 which is fixed on a frame 20 pivoting around a pivot 21.
  • the neutral passage device 30 comprises a rocking lever 31 which can oscillate around a pivot 32 between a stable rest position R, where a first bearing 59 placed in a region 33 is supported on a stop 58 of the housing 2 ', and one of two working positions T 1 or T 2 , the production and properties of which will be specified below.
  • a spring 34 which is stretched between a first attachment point 34 'of the lever 31 and a second attachment point 34 "placed on one end 16 of the lever 14 provides the neutral effect when the axis 34', 34 "of the spring passes through the axis of the pivot 32.
  • a second bearing 35 of the region 33 can come to bear under the effect of the spring 34 and for each of the positions T i or T 2 against a stop represented by the end 37 of a device for choosing the operating mode 36.
  • This device is for example constituted by a cylindrical rod 38 which can slide and rotate in an opening 39 of the housing 2 'so as to place a stud 43 of the housing 2' in one of the ends of a groove 42 circulating axially and tangentially on the surface of the part 38.
  • the latter is further subjected to the action of a return spring 41, which gives the end 37 a position M while a position A can be given to it by a push and a rotation exerted by the user on a head 40 of this part 38.
  • the lever 31 also has a hammer 44 which for each of the positions T, or T 2 will separate the movable and fixed contacts 48 respectively 49 of the safety switch 57.
  • the hammer 44 is placed opposite a end 46 'of a lever 46, which carries the movable contact 48 and of which another end 46 "is pivoted at a point 47 of the housing 2'.
  • the lever 46 and the contacts 48, 49 constitute a variable resistive torque switch marked with 45.
  • the lever 46 is in fact integral with a first end 50 "of a tension spring 50 having a second end 50 'fixed on a movable portion 51 of a device for adjusting position 78.
  • the adjustment device comprises an elastically deformable U-shaped part 53 having a fixed branch 55 secured to the housing 2 'and a movable branch 52 which carries the movable portion 51, the position of the latter being adjustable using a adjusting screw 54 which is screwed into the branch 52 and which rests on the branch 55. Any movement of the movable portion 51 modifies the torque exerted by the spring 50 on the lever 46.
  • this adjustment device is to make that, when the stop 37 is in position A and the lever 31 in position T 2 (which corresponds to an automatic operation of the closing of the switch), the torque exerted by the spring 50 on the lever 46 is slightly greater than the torque in the opposite direction exerted on the hammer 44 by the spring 34 to give the opening of the switch an unstable character; in this case as soon as the bimetallic strips cool, the lever 31 automatically returns to its rest position R for which the switch 57 is open.
  • a reset or reset of the thermal relay must then be carried out, after sufficient cooling of the bimetallic strips, to close the switch 57 manually.
  • This resetting which can be effected by a separate manual resetting member, can also be effected by an axial thrust, exerted to the left of FIG. 1b, on the button 40.
  • the thermal relay may also include a member 73, for effecting action on the lever 46, the voluntary opening of the switch 57 when a direction displacement B is communicated to it by the user.
  • the physical embodiment of the thermal relay 1 uses a first housing 2 "where we find, in FIG. 8a, the presence of neighboring cells 3a, 4a, 5a in each of which is placed a bimetallic strip 3, respectively 4, respectively 5, cooperating with the strip 9, movable in the plane RR '. Between two parallel walls 74, 76, placed laterally with respect to the cells, a bottom 72 and an external partition 86 is placed a housing 87 of small width "q ( about 11 mm) having a median plane PP 'parallel to the walls and perpendicular to RR'. The wall 76 is elastically deformable in the direction of the width "q".
  • an external face 88 of the housing 2 "giving access to the cells is closed by a cover 89 which also closes a lateral entry 99 of the housing 87.
  • connection terminals 100, 101, 102 which are guided by guns 101a, 102a, 103a, and are placed opposite other connection terminals 103, 104, 105.
  • Two openings 106, respectively 107 are placed in the external partition 86 and situated substantially in the plane PP 'for a purpose defined later, see FIG. 8a.
  • the housing 87 is intended to receive, between two opposite parallel faces 63 and 108 of the partitions 74, 76, the second housing 2 'whose functions have been specified above.
  • the volume 66 communicates with the outside on the one hand, through a lower opening 85 of the bottom 80 of the housing 2 'and, on the other hand, through a side window 83 opening on the side of a bearing face 61, see also FIGS. 4 and 8b, called to cooperate with the face 63 of the wall 74.
  • Volume 67 communicates with the outside on the one hand, through a side window 109 edge on the side of the side face 110 and, on the other hand, with a window 84 which opens on the face 61 of the housing 2 'and which occupies the entire width of the volume 68 opposite which it is placed, see FIGS. 2a, 4 and 5. Furthermore, a window 116 opening onto the face 64 and opposite the window 83 authorizes the movements of the pivoting frame 20.
  • the volume 66 mainly receives the organs of the transmission device 77 and of the thermal compensation device 19; the volume 67 receives mainly the organs of the switch device 45 and part of its adjustment device 78; finally, the volume 68 receives mainly the organs of the device passing through neutral 30 and those of the intensity adjustment device 65.
  • the pivots 18, 32 and 47 are advantageously constituted by U-shaped notches 18a, 18b; 32a, 32b; 47a, 47b, which receive knives from the corresponding moving parts, see in particular FIG. 3, while the frame 20 is pivoted by means of its cheeks 20 'on pins 21a, 21b.
  • This knife pivoting mode provides very low friction and facilitates mounting, while the greater friction which appears on the pins 21a, 21b of axis TT 'are easily overcome by the torque exerted on the cam 28 at the time of adjustment. intensity manual.
  • the axis YY 'of the joint 15 is also parallel to the other axes.
  • the part of the adjustment device 78 of the switch 45 which is not placed in the volume 67, passes through the window 109 and protrudes outside the housing 2 ′ as well as a first conductive part 70a which is fixed on this housing and which carries the terminal 70 to connect the latter to the fixed contact 49 and that a second conductive part 71a which is integral with the U-shaped part 53 and on which the lever 46 of movable contact rests 48 to connect it to terminal 71.
  • the part of the adjuster protruding from the housing 2 ' is one end of the U-shaped part (53) on which the screw (54) is engaged, so that when the removable housing (2') is not yet associated with the housing (2 "), it is extremely easy to carry out the factory adjustment of the torque mentioned above.
  • the conductors 70a and 71a, which run parallel to the bottom 80 will pass through the openings 106 respectively 107 of the partition 86 at the time of the association of the two housings.
  • the intensity adjustment members 29, for choosing the operating mode M or A 40 and for voluntary opening 73 of the switch move along or around parallel axes II ', respectively JJ' respectively KK 'while crossing an upper wall 113 of the housing 2 'which is opposite the bottom 80 and carries an upper adjustment face 79 on which is for example arranged the intensity scale 62.
  • These axes I, J, K are substantially placed in the plane PP '.
  • the conductors 70a and 71a a are beforehand. deprived of the screws of their terminal 70 respectively 71.
  • the cover 89 which is also put in place in the direction F, makes it possible to hold the box 2 ′ in place by pressing on the face 112 thereof (see FIG. 8b) by closing the housing 87 and closing the cells. 3a, 4a, 5a.
  • the reduction in the dimensions of the housing 2 ′ is mainly due to the respective arrangement of the parts in the different volumes and to a reduction in its walls by numerous windows and openings which also facilitate assembly.
  • the electrical isolation of the terminals 70, 71 which is established or completed during the association of the two boxes by one or more partitions 86 of the bimetallic box 2 "is also accompanied by environmental protection which is carried out by d other elements of this housing 2 "such as the walls 86, 76 and 74, the bottom 115 of the housing 87 and the cover 89 which close off all of the openings.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Insulated Conductors (AREA)
  • Surgical Instruments (AREA)
EP83402162A 1982-11-25 1983-11-08 Relais thermique Expired EP0110758B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83402162T ATE19324T1 (de) 1982-11-25 1983-11-08 Thermisches relais.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8219731 1982-11-25
FR8219731A FR2536905A1 (fr) 1982-11-25 1982-11-25 Relais thermique

Publications (2)

Publication Number Publication Date
EP0110758A1 EP0110758A1 (fr) 1984-06-13
EP0110758B1 true EP0110758B1 (fr) 1986-04-16

Family

ID=9279496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83402162A Expired EP0110758B1 (fr) 1982-11-25 1983-11-08 Relais thermique

Country Status (5)

Country Link
EP (1) EP0110758B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS59108230A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) ATE19324T1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE3363092D1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2536905A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4318530A4 (en) * 2021-11-23 2025-03-19 Zhejiang Chint Electrics Co., Ltd. THERMAL OVERLOAD RELAY

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2618019B1 (fr) * 1987-07-08 1989-11-17 Telemecanique Electrique Relais thermique
DE3840063A1 (de) * 1988-11-28 1990-05-31 Kloeckner Moeller Elektrizit Thermisches relais
DE102009043780B4 (de) * 2008-11-12 2011-01-27 Abb Ag Elektrisches Überlastrelais mit einer schwenkbar gelagerten Wippe

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315054A (en) * 1965-06-28 1967-04-18 Fed Pacific Electric Co Overload relay with snap-acting condition responsive switch
US3454917A (en) * 1966-12-28 1969-07-08 Gen Electric Canada Overcurrent protective device for electrical apparatus
GB1399401A (en) * 1972-01-11 1975-07-02 Cutler Hammer Inc Electric switches
GB2096397A (en) * 1981-04-04 1982-10-13 Crabtee Electrical Ind Ltd Electric overload device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4318530A4 (en) * 2021-11-23 2025-03-19 Zhejiang Chint Electrics Co., Ltd. THERMAL OVERLOAD RELAY

Also Published As

Publication number Publication date
FR2536905B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1985-03-22
DE110758T1 (de) 1984-10-25
DE3363092D1 (en) 1986-05-22
EP0110758A1 (fr) 1984-06-13
FR2536905A1 (fr) 1984-06-01
ATE19324T1 (de) 1986-05-15
JPH0367294B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1991-10-22
JPS59108230A (ja) 1984-06-22

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