US3544941A - Thermal relay - Google Patents

Thermal relay Download PDF

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Publication number
US3544941A
US3544941A US779016A US77901668A US3544941A US 3544941 A US3544941 A US 3544941A US 779016 A US779016 A US 779016A US 77901668 A US77901668 A US 77901668A US 3544941 A US3544941 A US 3544941A
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US
United States
Prior art keywords
sliding surface
spring
movable
sliding
slide
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
US779016A
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English (en)
Inventor
Otto Deissler
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.)
Starkstrom Schaltgeraetefabriken Sprindler Deissler and Co GmbH
Original Assignee
Starkstrom Schaltgeraetefabriken Sprindler Deissler and Co GmbH
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 Starkstrom Schaltgeraetefabriken Sprindler Deissler and Co GmbH filed Critical Starkstrom Schaltgeraetefabriken Sprindler Deissler and Co GmbH
Application granted granted Critical
Publication of US3544941A publication Critical patent/US3544941A/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
    • 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

Definitions

  • This sliding surface lies upon a projection, in turn, of a retaining member in which the sliding movable members are slidable.
  • a contact actuating link with a U-shaped portion is arranged relative to the sliding surface so that the U-shaped portion becomes contacted by the spring portion after sliding off the sliding surface.
  • the present invention resides in a thermal relay with one, two or more phases associated with actuating elements. These elements grip a slider Which actuates electrical operating contacts through motion along a predetermined path, depending upon the operating current.
  • Thermal relays of the preceding species are known in the art. These conventional relays, however, are exceptionally complex in design and construction, and are not reliable in operation.
  • each movable member is constructed with a spring portion associated with a sliding surface along a path corresponding to the operating current.
  • a movable element is arranged on the sliding surface so that the spring portion of each movable member strikes the electrical operating contact with this element after leaving the sliding surface.
  • An advantageous design of the present invention resides in the design of a spring portion of the movable member, so that this spring portion presses upon the movable element as a result of the force of the cool operating element during its return motion. This pressure exerted by the spring portion takes place until this spring portion reaches again its normal position upon the sliding surface, after sudden and sharp release from the movable element.
  • This design saves the use of springs or similar auxiliary means.
  • relays have required such spring parts, and these had to be pre-stressed during the operation.
  • the bimetallic strips were consequently subjected to considerable forces which caused them to become insensitive and operate with poor precision.
  • the movable members operate parallel to each other and are all movable within a slide.
  • the slide is provided with a recess into which the outer free end of a displaceable tongue expands for the purpose of regulating the setable region. In this manner, it is possible to achieve through simple construction, regulation of the setable region.
  • the slide and thereby the sliding surface of the projection of the slide become shifted or moved, and the operation takes place earlier or later, as desired.
  • each movable element is in the formof a U-shaped head member which grasps with play, the portion containing the sliding surface.
  • the spring portion of each movable member has an arch terminating in a projection parallel to the sliding surface, and including a reinforcing or supporting member.
  • the thermal relay with provision for space compensation. This may be achieved in a very simple manner from the constructional viewpoint, by providing that the operating elements as well as the tongue are of bimetallic strips which serve to compensate for spatial or dimensional variations.
  • the present invention provides further that the movable members and/or their spring portions of the relay are made of insulating material.
  • the design can be such that the springs are of metallic substance covered with insulating material.
  • the forces of the associated operational elements of bimetallic substance are applied only in conjunction with the operation.
  • these forces are not required to stress any springs or similar such elements during the operational process.
  • more than a single contact may be actuated by the movable element.
  • a thermal relay with one or more operating coil phases.
  • Each operating coil phase has an actuating member cooperating with a slidable or movable member.
  • An electrical signal contact becomes actuated through the sliding or movable memberin the path of motion of the latter.
  • Each sliding or movable member is provided with a spring portion terminating in a projection slidable upon a surface which projects from a slide. The slide with its sliding surface is positioned as a function of the current through the operating coil.
  • a movable U-shaped member actuates the electrical contact when the spring portion slides off the sliding surface on the slide.
  • FIG. 1 is a plane view of the thermal relay, in accordance with the present invention, when in the normal inoperative state;
  • FIG. 2 is a sectional view taken along the line 11-11 in FIG. 1;
  • FIG. 3 is a partial operational view of a portion of the relay in FIG. 1, when in the operated state.
  • a base plate 1 is provided with a simple and fixed guide block 2.
  • a slide 3 is held by the guide block and is movable to the left or right in relation to the fixed guide block.
  • the slide 3 has three longitudinal channels 30, 3b and 3c in which movable rods or bars 4, 5 and 6 are lengthwise retained. Through openings 7a, 8a and 9a, the individual movable rods or bars are contacted with actuating elements in the form of bimetallic strips 7, 8 and 9, respectively. These bimetallic strips are provided with coils 10, 11 and 12 corresponding to the desired phases.
  • a spring 13 lies at the right end of the slide 3 and abuts the plate 14.
  • a projection 3d and 3e At the left end of the slide 3 is a projection 3d and 3e.
  • the projection portion 3e has at its upper side a gliding or sliding surface 3f. Between the two projections lies a recess into which the foot 15c projects. This foot is part of a head portion to be described below.
  • Each movable bar or member 4, 5 or 6 is provided with a spring portion 4a in the form of an arch terminating in a projecting portion 4b Which is parallel to the gliding surface 3
  • the spring portion 4a furthermore, is provided with a cross or incline supporting member 4c.
  • the element 32 of the projection 3d of the slide has, for example, ane L-shape when viewed from the top.
  • a U- shaped head member 15a with feet 15b and 15c grasps the element 3e with play therebetween.
  • the head portion 15a with feet 15b and 15c are part of the movable member 15.
  • the movable member 15 is vertically slidable within the guiding bears 16, and is pressed upward in the normal or inoperative state, by a spring 18.
  • one or more additional contacts may be actuated, in operation, as for example the contact 23 which may be used to advantage as a signal contact.
  • the region of the right end of the slide 3 is provided with a recessed portion 24.
  • the outer free end of an adjustable tongue 25 reaches into the recessed portion 24.
  • the tongue is secured to a rotatable setting arrangement 26 which may be moved or adjusted in either clockwise direction or counterclockwise direction. As a result of this possible displacement of the arrangement 26, the tongue 25 may be displaced either to the left or to the right within the limits designated by the broken lines in drawing.
  • the tongue 25 serves the purpose of regulating the setting or adjustment region as to be described subsequently.
  • the tongue 25 as well as the operational members 7, 8 and 9 may be constructed of bimetallic strips.
  • All essential elements of the thermal relay, in accordance with the present invention, which are not directly operative with the contacts, are made of insulating material. This applies particularly to the slide 3, the movable rodes or bars 4, 5 and 6, and their spring elements 4a, 4b and 4c.
  • the aforementioned strip portions can also be constructed of spring metal with insulating covering.
  • the movable members 4 and 5 return or retrace their path, with their spring portion 4a as well as the projection 4b. In this motion, the projection 4b slides or glides on the left upper edge of the sliding surface 3 until the projection 4b is again on top of the sliding surface 3
  • the operational states of the relay may be determined from a comparison of FIGS. 1 and 3.
  • the reinforcing or supporting c-ross member 4c bears steadily on the upper surface of the foot 150, and thereby retains the movable member 15 in its lower or depressed position. This condition prevails even though the projection 4b has left contact with the foot 15b.
  • the cross member 40 is associated with a pressure or force amplification. At the instant, however, when the projection 4b reaches over the sliding surface 3 the projection slides upon the sliding surface to the right and towards its original position.
  • the thermal relay of the present invention provides for a simple configuration in which a dependable and sensitive differential protection is effectively achieved.
  • the relay takes this condition also into account in the following manner.
  • the thermal relay in accordance with the present invention, may be regulated over a wide setable region to take into account various factors.
  • the upper end of the tongue 25 extends into the recess 24 with a substantial amount of play between these two parts. If the tongue is rotated in the clockwise direction, the upper end of the tongue becomes displaced somewhat to the right. With a predetermined bending of the bimetallic strips, it will be understood that the right edge of the recess 24 will strike or come in contact with the upper end of the tongue 25. When the upper end of the tongue thus strikes or abuts against the inner wall of the recess 24, the slide 3 is held stationary, and accordingly the action described above occurs correspondingly in time.
  • the tongue 25 is rotated or displaced in the counterclockwise direction, the upper end of the tongue is moved or displaced to the left.
  • the slide is thereby first held stationary by the tongue after a larger sliding motion to the left.
  • the movable members 4, 5 and 6 can first incur a relative motion With respect to the slide, either individually or together, when a corresponding larger current prevails, as described above for the current loading.
  • the tongue 25 may be constructed of bimetallic strips. With this construction the bimetallatic strip is subjected to the same variation as the bimetallic strips 7, 8 and 9, which result from variations in the temperature of the space. By resorting to this type of construction, space temperature compensation is achieved.
  • the present invention is not limited to the embodiment described in the drawing.
  • the present invention may also be extended and used in conjunction with the principles that have hereinbefore described, so that the present intion may be adapted to different factors and conditions, as well as the associated constructions.
  • a thermal relay comprising, in combination, at least one operating coil means; actuating means in proximity of said operating coil means and operatively coupled with said coil means so that heat transmitted by said coil means impinges uponsaid actuating means; sliding means displaced by said actuating means; spring means secured to said sliding means; sliding surface means displaceable relative to said spring means, said spring means being movable on said sliding surface means; displacement means for displacing said sliding surface means; a movable member arranged relative to said sliding surface means and displaced by said spring means after sliding off said sliding surface means; and contact means actuated by said movable member when displaced by said spring means secured to said sliding means.
  • said sliding means comprises a plurality of slidable movable members arranged parallel to each other.
  • the thermal relay as defined in claim 2 including a slide retaining member for retaining said slidably movable members, said slidably movable members being slidable within said slide retaining member.
  • said spring means comprises an arch-shaped portion with a projecting portion parallel to said sliding surface means; and a supporting portion secured to said arch portion.
  • thermo relay as defined in claim 1 including electrically insulating means on said spring means.
  • a thermal relay comprising, in combination, at least one operating coil means; actuating means in proximity of said operating coil means and operatively coupled with said coil means so that heat transmitted by said coil means impinges upon said actuating means; sliding means displaced by said actuating means; a slide retaining member for retaining said sliding means; spring means on said sliding means; sliding surface means displaceable relative to said spring means, said spring means being movable on said sliding surface means; a movable member arranged relative to said sliding surface means and displaced by said spring means after sliding off said sliding surface means; and contact means actuated by said movable member when displaced by said spring means on said sliding means, said sliding surface means comprising a projecting portion on said slide retaining member.
  • a thermal relay comprising, in combination, at least one operating coil means; actuating means in proximity of said operating coil means and operatively coupled with said coil means so that heat transmitted by said coil means impinges upon said actuating means; sliding means displaced by said actuating means; spring means on said sliding means; sliding surface means displaceable relative to said spring means, said spring means being movable on said sliding surface means; a movable member arranged relative to said sliding surface means and displaced by said spring means after sliding off said sliding surface means; contact means actuated by said movable member when displaced by said spring means secured to said sliding means, said sliding means comprising a plurality of slidable movable members arranged parallel to each other; a slide retaining member for retaining said slidably movable members, said slidably movable members being slidable within said slide retaining member; and a displaceable tongue member having a free end extending into a recess of said slide retaining member.
  • thermo relay as defined in claim 11 wherein said actuating means and said tongue member comprise bimetallic strips for compensating against dimensional changes resulting from thermal effects.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Control Of Temperature (AREA)
US779016A 1967-11-27 1968-11-26 Thermal relay Expired - Lifetime US3544941A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1614743 1967-11-27

Publications (1)

Publication Number Publication Date
US3544941A true US3544941A (en) 1970-12-01

Family

ID=5682033

Family Applications (1)

Application Number Title Priority Date Filing Date
US779016A Expired - Lifetime US3544941A (en) 1967-11-27 1968-11-26 Thermal relay

Country Status (4)

Country Link
US (1) US3544941A (enrdf_load_stackoverflow)
DE (2) DE1614743B1 (enrdf_load_stackoverflow)
FR (1) FR1599862A (enrdf_load_stackoverflow)
GB (1) GB1227618A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4837455A (en) * 1987-05-20 1989-06-06 Sleator Michael G Interrupt controlled switching device
FR2814276A1 (fr) * 2000-09-18 2002-03-22 Fuji Electric Co Ltd Disjoncteur
CN103489720A (zh) * 2013-09-24 2014-01-01 国家电网公司 一种高灵敏度热继电器
CN103489719A (zh) * 2013-09-11 2014-01-01 国家电网公司 一种热继电器
CN104282504A (zh) * 2014-10-10 2015-01-14 成都锐奕信息技术有限公司 具有增加控制灵敏度功能的继电器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE625121C (de) * 1930-10-18 1936-02-04 Siemens Schuckertwerke Akt Ges UEberstromwaermezeitausloeser mit Raumtemperatur-Kompensation
US2199477A (en) * 1937-08-20 1940-05-07 Besag Ernst Releasing device for electric switches
GB994436A (en) * 1960-11-09 1965-06-10 Normacem Sa Thermal relay for polyphase currents

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1056714B (de) * 1958-07-03 1959-05-06 Schiele Industriewerke K G Thermisches Relais zum Schutz gegen UEberstrom und Einphasenbetrieb

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE625121C (de) * 1930-10-18 1936-02-04 Siemens Schuckertwerke Akt Ges UEberstromwaermezeitausloeser mit Raumtemperatur-Kompensation
US2199477A (en) * 1937-08-20 1940-05-07 Besag Ernst Releasing device for electric switches
GB994436A (en) * 1960-11-09 1965-06-10 Normacem Sa Thermal relay for polyphase currents

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4837455A (en) * 1987-05-20 1989-06-06 Sleator Michael G Interrupt controlled switching device
FR2814276A1 (fr) * 2000-09-18 2002-03-22 Fuji Electric Co Ltd Disjoncteur
CN103489719A (zh) * 2013-09-11 2014-01-01 国家电网公司 一种热继电器
CN103489719B (zh) * 2013-09-11 2016-09-21 国家电网公司 一种热继电器
CN103489720A (zh) * 2013-09-24 2014-01-01 国家电网公司 一种高灵敏度热继电器
CN104282504A (zh) * 2014-10-10 2015-01-14 成都锐奕信息技术有限公司 具有增加控制灵敏度功能的继电器

Also Published As

Publication number Publication date
DE1614743B1 (de) 1970-09-24
GB1227618A (enrdf_load_stackoverflow) 1971-04-07
DE6602774U (de) 1969-06-19
FR1599862A (enrdf_load_stackoverflow) 1970-07-20

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