US2051380A - Thermal relay - Google Patents

Thermal relay Download PDF

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Publication number
US2051380A
US2051380A US759719A US75971934A US2051380A US 2051380 A US2051380 A US 2051380A US 759719 A US759719 A US 759719A US 75971934 A US75971934 A US 75971934A US 2051380 A US2051380 A US 2051380A
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US
United States
Prior art keywords
container
relay
thermal
core
oil
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
US759719A
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English (en)
Inventor
Benjamin W Jones
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.)
General Electric Co
Original Assignee
General Electric Co
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 to US450298D priority Critical patent/USB450298I5/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to US759719A priority patent/US2051380A/en
Application granted granted Critical
Publication of US2051380A publication Critical patent/US2051380A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H71/164—Heating elements

Definitions

  • thermal overload relays The operation of thermal overload relays is to a large extent dependent upon the thermal propertics of the medium surrounding the thermal working parts of the relay, and serious operating difficulties are encountered, therefore, in the design of thermal relays for oil immersed operation.
  • the required Watt input to operate a thermal relay in air is increased by approximately 400% when the relay is immersed in a large body of oil.
  • This large watt input is of course unsatisfactory, and may be offset by thermally isolating the working parts of the relay from the large bcdy of oil. Resort may be had, for this purpose,
  • relay requires that the thermal parts of theyrelay be subjected at all times to the same ambient medium, and it will be apparent that if the sealed container develops a leak before the relay is immersed, or if the relay is removed from its oil bath after the leak occurs, the oil within the container will drain out and the operation of the relay will be considerably affected by the air which enters the container.
  • I l5v provide a container for the thermal operating parts of the relay comprising walls of thermal insulating material, at least one of the Walls having an aperture therein for the admission of oil when the device is immersed in a body of oil.
  • a 20 device is described and broadly claimed in a copendlng application of Charles H. Chapman, Serial No. 43,741 led October 5, 1935, entitled Temperature overload relay, which application i is assigned to the same assignee as the present invention.
  • the present invention is an improvement of the invention disclosed in the above ap'- -plication, which invention was madeby the said Charles H.
  • I provide a thermal insulat- ⁇ ing container within which is supported a. ⁇ core having an axially extending slot therein, a'heat- 45 ing winding surrounding the core and a bimetallic element disposed in the slot with an end thereof adjacent a movable member which extends through an aperture in the container wall to control the external contactsg-
  • the core is formed of magnetizable material and the heat-A ing winding comprises a closed circuited second.- ⁇ iuy inductively. related to a primary Winding
  • thepreferred embodiment of my invention shown comprises a base I0 of thermal insulating material having a pair of intersecting recesses II and I2 respectively formed therein.
  • a core member I3 secured to the base Ill as by the screw I4 and provided with an axially extending slot I5 in which a bimetallic element I6 is disposed, with one end thereof secured to a heating member comprising a cylindrical conductor I1 closely surrounding the portion of the core I3 which extends outwardly from the base I0.
  • the outermost end of the core I3 is threaded as shown at I8 and is engaged by a cap I9 of thermal insulating material one face of which is provided with a groove 20 to form shoulders for positioning a cylindrical member 2l of thermal insulating material which surrounds the cylindrical conductor I1, with its opposite end abutting against a face of the base I0 which is provided with a positioning shoulder 22.
  • the cap I9, the cylinder '2l and the base I0 comprise the walls of a nonairtight 4container for the thermal working parts of the relay, no sealing means being provided between the walls, the intersecting recesses II and I2 forming an aperture in one of the walls. It is highly important that the walls of the container be arranged in a non-airtight manner so as to allow the escape of air therefrom when the relay is ⁇ immersed in oil, and in some cases it may be desirable to provide a second aperture inthe container.
  • the bimetallic element I6 and the core I3 which are arranged to occupy a minimum of space, with a substantial portion of the bimetallic element enclosed on three sides by the core which is formed of heat storage material and on the fourth side by the heating member I1 to provide a high degree of heat transfer to the bimetallic element.
  • the free end of the bimetallic element I6 is adjacent the intersection of the recesses II and I2 and engages one end of a movable member comprising a floating plunger 23 of insulating material arranged in the recess I2, sufficient clearance being provided between the plunger and the walls of the recess to permit oil to iiow ltherethrough into the container.
  • a' portion ofv the plunger. 23 is broken away more clearly to show the arrangement of the circuit controlling contacts.
  • the thermal working parts of-the relay comprise the heating memberv II,I
  • any-'suitable means may be employed for producing a flow of current through the heating member I1 to heat the thermal Working parts of the relay in accordance with the heating conditions in the circuit to be protected, I prefer, in order electrically to insulate the thermal working parts of the relay from the circuit to be protected, to form the core member I3 of magnetizable material and to arrange the heating member I1 as a closed circuited secondary winding which is inductively related to a primary winding 33 supported on an insulating spool 34 surrounding the insulating cylinder 2l.
  • I Surrounding the primary winding 33, I provide an insulating cylinder 35 arranged concentrically with the insulating cylinder 2
  • the cylinder 35 which maybe omitted Without greatly aecting the operation of the relay, is provided with a pair of apertures 38 and 39 through which suitable connecting leads may extend from the primary Winding 33 to the circuit to be protected. Itwill be apparent that the apertures 38 and 39 also permit the escape of air from the cylinders 2D and 35, and the dow of oil thereinto.
  • this embodiment of my invention is in eilect, a combination of a current transformer and a thermal relay. Accordingly, the relay is very flexible in its application and may bc applied to the protectionof apparatus designed to operate at any value of voltage within practi- 'cal limits simply by employing a properly wound primary winding.
  • the heat generated in the heating member I'I is conducted therefrom to the bimetallic element, to the core member I3 and to the oil contained in the slot I5, and upon the occurrence of an overload of sunlcient magnitude and duration to endanger the apparatus to be protected, there will be suiiicient heat transferred to the bimetalllc element I6 to cause the bimetallic element to flex.
  • the plunger 23 is moved upwardly in the recess I2 to engage the spring'arm 21 and open the contacts 24 and 25.
  • a thermal relay comprising a core having a slot extending axially thereof, a heating member adapted to be heated'by current ow therein comprising a conductor body closely surrounding said core and a thermo-responsive device disposed in said slot to be inuenced by said heating member.
  • a thermal relay comprising a core having an axially extending slot therein, a heating winding closely surrounding said core, a bimetallic element disposed in said slot to be inuenced by said heating winding, and relatively movable contacts controlled by said bimetallic element.
  • a thermal relay comprising a magnetizable core having an axially extending slot therein, a closed circuited winding surrounding said core,
  • thermo-responsive device disposed in said slot to be thermally iniluenced by said closed circuited Winding.
  • a thermal relay comprising a magnetizable core having ⁇ an axially extending slot therein, n single-turn closed circuited winding comprising a conductor body surrounding said core, means for producing a magnetic iiux in said core to induce a heating current in said conductor body, a bimetallic element disposed in said slot to be thermally influenced by said conductor body, and relatively movable contacts controlled by said bimetallic element.
  • a thermal relay comprising a primary winding, a magnetiaable core disposed within and spaced from said winding, said core having a slot extending axially thereof, a closed circulted heating winding surrounding said core in inductive relation with said primary Winding and a thermorwponsive device disposed. in solo: slot to be thermolly lnuenceol by said closed clrcuited Winsl-v 6.
  • a thermal relay comprising e. primary Windable contacts controlled by said bimetallic ele-- ment.
  • thermo relay comprising walls oi thermal insulating material arranged to form a container, one of said walls having an aperture therein, relatively movable contacts supported externally of said container, means including a movable member extending through said aperture for controlling said contacts, a movable. thermo-responsive element within said container having a portion ,engaging said movable member, and means within said container for heating said thermo-responsive element tol operate said movable member.
  • a thermal relay comprising walls of thermal insulating material arranged to form a container, one of said walls having Aan aperture therein, relatively movable contacts supported externally of said container, means including a e movable member extending through said aperture for controlling said contacts, a heating member adapted to be heated by current ow therein comprising a cylindrical conductor within said container and a bimetallic element having a portion extending within said cylindrical conductor to be thermally inuenced thereby and another portion arranged to operate said movable member.
  • a thermal relay comprising walls of thermal insulating material arranged to form a container
  • one of Said walls having an aperture therein, relatively movable contacts supported externally of said container, means including a movable member extending through said aperture for controlling said contacts, a bimetallic element within said container arranged to operate said ymovable member, a closed circuited heating winding within said container thermally associated with said bimetalllc element, and means disposed externally oi said container for inducing aheating current in said closed circuited winding to influence i said bimetallic element.
  • a thermal relay comprising walls of thermal insulating material arranged to form a container, one oi said ⁇ tvalls having an aperture therein' a core within said container having a slot extending axially thereof, a heating winding surrounding said core, a movable thermo-responsive element disposed in said slot to be influenced by said heating, ⁇ winding, a movable member extending through said aperture arranged to be operated by said thermo-responsive element and relatively movable contacts supported externally ot; said container controlled by said movable member.
  • a thermal relay comprising walls of thermal insulating material arranged to form a connosed in said slot to be thermally inuenced by --said winding, e, movable lmember extending through said aperture arranged to be operated by said bimetallic element and relatively movable contacts supported externally of said container controlled by said movable member.
  • a thermal relay comprising walls oi thermal insulating material arranged toform a container, one of said ⁇ Walls having an aperture therein, a magnetizalole core within said container having a slot extending axially thereof, a single-turn secondary winding comprising a cons doctor body closely surrounding said core, means including a primary winding surrounding said container for producing a iiux in said core to induce a heating current in said conductor body,
  • a bimetallic element disposed in said slot to loe thermally influenced by said conductor body, va movable member extending through said aperture arranged to be operated by said bimetallic element and relatively movable contacts supported externally of said container controlled by said movable member.
  • a thermal relay comprising walls of thermal insulating material arranged to form a container, one of said Walls having an aperture therein, a magnetizable core Within said container having a slot extending axially thereof, a heating member comprising a cylindrical conductor surrounding said core, means'including a primary winding surrounding said container for producing a ux in said core to induce a heating current in said cylindrical conductor, a bimetallic element disposed in said slot having one end secured to said cylindrical conductor, a movable member extending through said aperture arranged to be operated by said bimetallic element and relatively movable contacts supported externally of said container controlled by said movable member.
  • a thermal relay comprising a base of insulatingv material having a pair of intersecting recesses therein, Walls of thermal insulating material cooperating with said base to form a container enclosing one of said recesses, a bimetallic element supported in said container with a movable portion thereof extending into said one recess, a movable member disposed in said other recess to be operated by said bimetallic element,
  • a thermal relay comprising a base of thermal insulating material having a pair of intersecting recesses therein, a core supported in one of said recesses and extending outwardly from said base, said core having a slot extending axially thereof, a movable thermo-responsive element arranged in said slot with a portion thereof adjacent the intersection or' said recesses, a movable member disposed in said other recess to be operated by said thermo-responsive element, relatively movable contacts supported on said base to be controlled by said movable member, Walls of thermal insulating material cooperating with said base to enclose said core and said therino-responsive element, and means Within said enclosing walls for heating said thermo-responsive element to operate said movable member.
  • a thermal relay comprising a base or" insulatingl material having a pair of intersecting recesses therein, a magnetizable core supported in one of said recesses and extending outwardly from said base, said core having a slot extending axially thereof, a, bimetallic element disposed in said slot with a movable portion thereof vadjacent the intersection of said recesses, a movable inember disposed in said other recess to be operated by said bimetallic element,- relatively movable contacts supported on said base to be controlled by said movable member, Walls of insulating material cooperating with said base to enclose saidcoreand said bimetallic element, agclosed circuited winding surrounding said core'vvithin said enclosing walls, and means disposed externally of said enclosing Walls for producinga nur: in .said magnetizable 'core to induce a heating current in said closed circuited Winding whereby saidbimetallic element is heated to able
  • a thermal relay comprising a base of thermal insulating material having a pair of interseating recesses therein, a magnetizable core supported in one of said recesses and extending out- Wardly from said base, a pair of spaced concentric cylinders of insulating material surrounding v said core and having their adjacent ends abutting said base, a cap member of thermal insulating material threadedly supported on the extendcore abutting the opposite adjacent ends of said spaced cylinders, said cap and l said base being provided with concentric shoulders for positioning said spaced cylinders to form a container having inner and outer spaced Walls, a primary winding disposedybetween said spaced walls surrounding said inner Wall, a heating member comprising a cylindrical conductor disposed Within said inner wall in inductive relation with said primary winding surrounding said magnetizable core, a bimetallic element disposed in said slot having one end directly secured to said heat- ⁇ ing member, said bimetallic element having its free end adjacentv the intersection of said rece
  • a relay having a movable member, a movable contact biased toward said member, a second movable contact engaging said rst contact and biased in the opposite direction, the biasing force on said second contact predominatihg whereby the resultant biasing force urges said engaging contacts away from said movable member, and means including an adjustable stop member associated with said second contact for positioning said engaging contacts relative to said movable member, said movable member being arranged when operated to move said first contact tacts.
  • a thermal relay comprising a member. movable in accordance with the thermal condition of .arm predominating whereby said engaging con-y 'tacts' are biased away from said movable memy ber, and means including an adjustable stop eni against ⁇ the bias thereon to disengage said cona heating current in said closed circuited windgaging said second spring arm for positioning said engaging contacts relative to said movable member, said movable member being arranged to engage said rst spring arm to open said contacts upon the occurrence of a thermal condition predetermined by the adjustment of said stop.
  • a thermal relay adapted for oil immersed operation comprising walls of thermal insulating material arranged to form a perforate container, the degree of perforation being such as to permit said container substantially to fill with oil when said container is immersed in a body of oil, the relatively small body of oil within said container being thermally insulated from the main body of oil, a thermo-responsive device disposed within said container, a closed circuited heating winding within said container thermally related to said thermo-responsive device, and means arranged externally of said container for inducing ing to iniluence said thermo-responsive device.
  • a thermal relay adapted for oil immersed operation comprising walls of thermal insulating,
  • a perforate container material arranged toform a perforate container, the degree of perforation being such as to permit said container substantially to ll with oil when said container is immersed in a body of oil, the relatively small body of oil within said container being thermally insulated from the main. body of oil, a bimetallic element disposed within said container, a closed circuited winding thermally related to said bimetallic element within said container, and means including a primary winding surrounding said container for inducing a heating current in said closed circuited winding thermally to influence said bimetallic element.

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US759719A 1934-12-29 1934-12-29 Thermal relay Expired - Lifetime US2051380A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US450298D USB450298I5 (pt) 1934-12-29
US759719A US2051380A (en) 1934-12-29 1934-12-29 Thermal relay

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Application Number Priority Date Filing Date Title
US759719A US2051380A (en) 1934-12-29 1934-12-29 Thermal relay

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US2051380A true US2051380A (en) 1936-08-18

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US759719A Expired - Lifetime US2051380A (en) 1934-12-29 1934-12-29 Thermal relay

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824922A (en) * 1953-05-11 1958-02-25 Westinghouse Electric Corp Circuit control device
US2831943A (en) * 1955-04-06 1958-04-22 Westinghouse Electric Corp Overload relay
US3126500A (en) * 1959-05-12 1964-03-24 Westinghouse Electric Corp Thermally responsive device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824922A (en) * 1953-05-11 1958-02-25 Westinghouse Electric Corp Circuit control device
US2831943A (en) * 1955-04-06 1958-04-22 Westinghouse Electric Corp Overload relay
US3126500A (en) * 1959-05-12 1964-03-24 Westinghouse Electric Corp Thermally responsive device

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