US2650967A - Thermorelay with indirectly heated bimetallic strip - Google Patents

Thermorelay with indirectly heated bimetallic strip Download PDF

Info

Publication number
US2650967A
US2650967A US276720A US27672052A US2650967A US 2650967 A US2650967 A US 2650967A US 276720 A US276720 A US 276720A US 27672052 A US27672052 A US 27672052A US 2650967 A US2650967 A US 2650967A
Authority
US
United States
Prior art keywords
helix
thermorelay
relay
strip
bimetallic strip
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
Application number
US276720A
Other languages
English (en)
Inventor
Viboud Albert
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin 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 Merlin Gerin SA filed Critical Merlin Gerin SA
Application granted granted Critical
Publication of US2650967A publication Critical patent/US2650967A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • H01H71/162—Electrothermal mechanisms with bimetal element with compensation for ambient temperature
    • 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
    • H01H71/161—Electrothermal mechanisms with bimetal element with helically or spirally wound bimetal

Definitions

  • An object of the invention is a development of a thermorelay in which the distribution of the heat supplied by the heating element may readily and precisely be predetermined, viz., the proportion between useful heat transmitted to the bimetallic strip and lost or dispersed heat, and thus the extent to which the bimetallic strip is deflected.
  • a further object of the invention is the overcoming in such apparatus of the difficulty that for a given bimetallic strip the temperature defiection characteristic is fixed and thus the heattime characteristic or the timing of the relay.
  • the inventor now has discovered that it is possible to change the character of this timedefiection relationship, thus to accelerate or to delay any part of the strip deflection and thus, for instance, to provide for a more rapid or for a slower closing or opening of the switch, if so desired.
  • An object of the invention thus is a temperature control device which makes possible the regulation and control at will of the time-temperature characteristic of the relay thus the precise control of the time delay when, as soon as a given current intensity is reached, the relay mechanism is to be released and the velocity with which it is to be released and thereafter to be reset.
  • the convolutions 01' the helix when the bimetallic strip is heated, will lengthen and displace themselves peripherally within the curved surface of the cylinder which envelops the coil, without noticeable change of the diameter of the coil or helix.
  • the free end of the helix, the other end being fixed, will be displaced along a helical line around this cylinder surface.
  • thermorelay with a bimetallic strip wound as a helix
  • the switching means of the relay are coupled with this helix for operating the relay dependent upon the thermic conditions to which the helix is subjected.
  • the relay is provided with the conventional terminals which are to be connected to the electrical circuit in which the relay is operative.
  • the heating element is electrically inserted.
  • the current of the relay circuit thus passes through and heats the heating element which, for its part, is disposed in vicinity to the helix.
  • the heat is thus transmitted to the helix which in this way is indirectly heated by the current of the relay circuit.
  • the heating element may be disposed within the generating cylinder of the helix, axially extended therein, coaxially with the helix, such as in the form of a rod, a wire, or a wire wound as a coil, or in the form of a cylinder, or in any other convenient form or shape.
  • Both bimetallic helix and heating element are enclosed in a casing, preferably cylindrical.
  • a closed casing preferably extended in the vertical direction, allows this casing to function as a kind of flue if there is provided one or more openings through which the heated air may escape from the heated interior of the enclosure,
  • the velocity of the circulation of this air may be controlled by the varia tion of the section of the openings, for instance by means of a register.
  • a rapid return of the bimetallic strip into zero position may thus be achieved and, concomitantly, the possibility of controlling the relay, conformably to a given thermic image closely approximating that of the apparatus to be protected.
  • Fig. l is an elevational view of an embodiment of the thermorelay of the invention.
  • Fig. 2 is a diagrammatic perspective of a switch release mechanism controlled by the thermorelay of Fig. 1;
  • Fig. 3 illustrates, likewise in diagrammatic perspective, a control mechanism of a ventilating device for the bimetallic helix of Fig. 1.
  • I l and I2 are the terminals of the relay. Electrically connected with these terminals is the heating element, in the embodiment of Fig. 1 in the form of an exchangeable rod E3 of any convenient or conventional conductive or semiconductive material.
  • the rod is secured directly to the upper terminal ii and to the lower terminal 12 through the intermediary of an expansion compensator M.
  • the bimetallic strip of conventional material is wound as a helix l5 coaxially with the rod.
  • the upper terminal or head piece ll carries, suspended therefrom, a cylindrical casing 20 of any appropriate material, metal or heat resisting insulating material ever according to the desired working characteristics of the thermorelay.
  • the helix with its one end it is secured to the casing near the upper end thereof and is thus suspended within the cylindrical casing coaxially therewith and also coaxially with the heating element, or rod I3.
  • the cylindrical casing 20 is open at both its ends.
  • the upper end is covered by the terminal or head piece which in this embodiment of the invention is pierced by one or more ventilation ducts iii and i9.
  • These ventilation ducts may open at the upper face of the terminal H, as illustrated, but may also be arranged otherwise such as to open at the side faces of the terminal.
  • the passage through these ducts may be regulated and controlled thus by being opened or closed more or less by an appropriate arrangement, for example by a register 23, the arrangement and function of which will be described later on.
  • the device operates as follows:
  • FIG. 2 An embodiment of such a release mechanism operated by the bimetallic helix is shown in Fig. 2.
  • the switching contacts are and 5
  • the mechanism is so designed that the end I! of the helix l5 may already bear against the pin ii! before the point of overcharge is reached at which the switch is to open.
  • the spring 4d therefore is so designed that the pin All will rock the vane 36 and thus trip contact 5
  • Fig. 3 shows schematically an embodiment of such a governing and control device.
  • This register is provided with. a finger 265 which is engaged by the forked end 2'5 of a reel; lever 28 oscillatorily supported by a rock shaft 30. The other end 29 of rock lever 28 is likewise forked and engages the free end i! of the bimetallic helix.
  • Thermorelay with bimetallic strip and switching means coupled with said strip for operating the relay dependent upon the thermic condition of said strip said relay having terminals adapted to be connected with the electrical circuit in which the relay is operative; a heating element electrically connected to and between said terminals so as to be passed by the current of said circuit and to be heated thereby; a casing disposed at said thermorelay; said bimetallic strip and said heating element being housed in the space of said casing and in vicinity to each other so as for said heating element to transmit heat to said strip for the indirect heating of the same; supplemental regulating mechanism being coupled with said strip so as to be actuated thereby and, dependent upon the deflection of the strip, to modify the thermic condition of the space thus the time-heat characteristics of the relay.
  • said casing comprises ventilation apertures, a register for the control of said apertures; said mechanism being further coupled with said register, thereby, on deflection of said strip, to con- -3 trol the setting of the register and thus the passage of the ventilating air through said ventilation apertures.
  • ventilation apertures are provided in said casing for ventilating the space in said casing and a register is provided at said apertures, said helix having one of its ends fixed and the other end free, control mechanism being coupled with said free end of the helix and with said register thereby, on deflection of said free end of the helix, to control the setting of the register and thus the passage of the ventilating air through said ventilating ducts.

Landscapes

  • Thermally Actuated Switches (AREA)
US276720A 1951-04-04 1952-03-14 Thermorelay with indirectly heated bimetallic strip Expired - Lifetime US2650967A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1035096T 1951-04-04

Publications (1)

Publication Number Publication Date
US2650967A true US2650967A (en) 1953-09-01

Family

ID=9585504

Family Applications (1)

Application Number Title Priority Date Filing Date
US276720A Expired - Lifetime US2650967A (en) 1951-04-04 1952-03-14 Thermorelay with indirectly heated bimetallic strip

Country Status (4)

Country Link
US (1) US2650967A (es)
BE (1) BE509238A (es)
FR (1) FR1035096A (es)
NL (1) NL167067B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057979A (en) * 1960-06-07 1962-10-09 Arthur M Cohen Brushless mechanico-electrical transducer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1089070B (de) * 1958-01-30 1960-09-15 Georges Bloch Thermoelektrisches Relais

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2343461A (en) * 1942-01-10 1944-03-07 Western Electric Co Strand supply apparatus
US2350403A (en) * 1941-02-10 1944-06-06 Eugene R Kulka Two-way flasher and circuit control
US2354529A (en) * 1942-06-03 1944-07-25 Edison Inc Thomas A Control device
US2411352A (en) * 1944-05-23 1946-11-19 Westinghouse Electric Corp Cutout

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2350403A (en) * 1941-02-10 1944-06-06 Eugene R Kulka Two-way flasher and circuit control
US2343461A (en) * 1942-01-10 1944-03-07 Western Electric Co Strand supply apparatus
US2354529A (en) * 1942-06-03 1944-07-25 Edison Inc Thomas A Control device
US2411352A (en) * 1944-05-23 1946-11-19 Westinghouse Electric Corp Cutout

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057979A (en) * 1960-06-07 1962-10-09 Arthur M Cohen Brushless mechanico-electrical transducer

Also Published As

Publication number Publication date
FR1035096A (fr) 1953-08-14
BE509238A (es)
NL167067B (nl)

Similar Documents

Publication Publication Date Title
US3849756A (en) Nitinol activated switch usable as a slow acting relay
US2303153A (en) Carrier current controller
US2574093A (en) Adjustable trip
US2650967A (en) Thermorelay with indirectly heated bimetallic strip
US2182864A (en) Overload protective switch
US1501019A (en) Electric-circuit protective device
US2309207A (en) Electric switch
US2879358A (en) Fluid fuel control apparatus
US2586429A (en) Circuit breaker operating mechanism
US3353128A (en) Thermally and magnetically responsive electrical control device
US2367059A (en) Burner control system
US2351983A (en) Protective device having electrical resetting
US2434186A (en) Combined electromagnetic and thermal protective circuit breaker system
US1942699A (en) Three position switch and reset
US2354162A (en) Circuit breaker
US2141749A (en) Maximum current switch
US2265766A (en) Time delay mechanism for repeating fuses
US1900013A (en) Protective system for fluid cooled tubes
US2753423A (en) Arc suppressors for electric switchgear
US2300901A (en) Thermal overload relay
US1951446A (en) Control system
US1918378A (en) Electric switch and closing and opening means therefor
US2968466A (en) Valve and control system
US1524571A (en) Thermally-operated control device
US2321122A (en) Reclosing circuit breaker