EP0017813B1 - Release mechanism for a thermal protection relay - Google Patents

Release mechanism for a thermal protection relay Download PDF

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Publication number
EP0017813B1
EP0017813B1 EP80101602A EP80101602A EP0017813B1 EP 0017813 B1 EP0017813 B1 EP 0017813B1 EP 80101602 A EP80101602 A EP 80101602A EP 80101602 A EP80101602 A EP 80101602A EP 0017813 B1 EP0017813 B1 EP 0017813B1
Authority
EP
European Patent Office
Prior art keywords
bearing bracket
protective relay
bearing
tripping lever
lever
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
EP80101602A
Other languages
German (de)
French (fr)
Other versions
EP0017813A1 (en
Inventor
Albert Warnest
Friedrich Ebnet
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0017813A1 publication Critical patent/EP0017813A1/en
Application granted granted Critical
Publication of EP0017813B1 publication Critical patent/EP0017813B1/en
Expired 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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H71/7445—Poly-phase adjustment
    • 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

  • the invention relates to a trigger for a thermal protection relay with a pivotally mounted, U-shaped bearing bracket for an adjustable via an adjusting cam, a contact set acting release lever which is connected to a temperature compensation strip.
  • the mounting and holding of the bearing bracket is simplified if the bearing bracket on the web has an elastic tongue bent out towards the legs, which engages behind an undercut of the bearing pin.
  • a compact unit that can be accommodated in the smallest space is obtained if the release lever and temperature compensation strips are fastened next to one another in the longitudinal direction of the bearing bracket. With relatively little effort without significant frictional losses can be used if the release lever is an angle lever and the direction of action of the thermal sensor on the lever is substantially parallel to the longitudinal direction of the leg of the bearing bracket.
  • the protective relay shown in FIG. 1 consists of the housing 1, in the lower part of which the bimetallic strips 2, which represent the sensors, are fastened and act on differential trigger slides 3.
  • the differential trigger slide 3 are operatively connected to the trigger lever 5 via the differential lever 4 (FIG. 3).
  • the release lever 5 is designed as an angle lever and is pivotably mounted on the pin 6 in the U-shaped bearing bracket 7.
  • the direction of action of the differential lever 4 on the arm 8 of the release lever 5 runs practically parallel to the connection point of the longitudinal axis of the pin 6 and the longitudinal axis of the bearing pin 9 for the U-shaped bearing bracket 7.
  • the bearing points are located in the legs 10 of the bearing bracket, whereas on Web 11 of the bracket 7, the end 12 of the U-shaped bent temperature compensation strip 13 is welded.
  • the end 14 of the temperature compensation strip is supported on the cams 15 of the adjusting eccentric 16 at least when the bistable 2 is deflected.
  • the bearing bracket 7 is in the most extended position possible and the trigger lever comes into engagement with the arm 17 with the dead center spring 18 for the contact arrangement 19.
  • a sheet metal bracket 21 is adjustably arranged on the arm 17 via an adjusting screw 20.
  • Another adjusting screw 22 is used to adjust the position for the dead center spring 18.
  • temperature compensation strips 13 and release lever 5 lie next to one another in the web direction of the bearing bracket.
  • the bearing pin 9 for the bearing bracket 7 can be seen with an undercut 23, behind which a punched-out tongue 24 snaps onto the web 11 of the bearing bracket 10 after the bearing bracket has been fitted, so that no further holding means for the bearing bracket 7 are required.
  • the trigger mechanism can be inserted as a prefabricated unit into the housing 1, which furthermore particularly affects the manufacturing process Simplified in terms of automation.
  • the drawing shows that in the subject of the invention without the use of additional springs, the end 14 of the temperature compensation strip 13 is in contact with the adjusting cam 15, provided that the differential slides 3 move in the direction of tripping.
  • the fact that the temperature compensation strip 13 is U-shaped and encompasses both bearing points 6 and 9 results in a compact design, so that the protective relay can be accommodated in a relatively small housing.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)

Description

Die Erfindung bezieht sich auf einen Auslöser für ein thermisches Schutzrelais mit einem schwenkbar gelagerten, U-förmigen Lagerbügel für einen über einen Einstellnocken einstellbaren, einen Kontaktsatz beaufschlagenden Auslösehebel, der mit einem Temperaturausgleichsstreifen in Verbindung steht.The invention relates to a trigger for a thermal protection relay with a pivotally mounted, U-shaped bearing bracket for an adjustable via an adjusting cam, a contact set acting release lever which is connected to a temperature compensation strip.

Bei einem aus der Siemens-Zeitschrift 47 (1973), Heft 4, S 275-278 bekannten Schutzrelais der obengenannten Art ist ein sich über die ganze Länge des Relais erstreckender, U-förmiger Bügel vorhanden, der an den Schenkeln zwei voneinander getrennte Doppelansätze hat, in denen die Lagerstellen einerseits für den Lagerbügel selbst und andererseits für den Temperaturausgleichsstreifen vorgesehen sind. Die Lagerung des Lagerbügels selbst erfolgt am Ende desselben ; im Mittelteil ist der Temperaturausgleichsstreifen, der einerseits von den Fühlern beaufschlagt wird und andererseits die Kontaktanordnung beaufschlagt, schwenkbar gelagert. Das andere freie Ende des Lagerbügels liegt am Einstellnocken des Schutzrelais an. Hierzu dient eine gesonderte Feder. Durch die Erfindung soll die bekannte Schutzrelaisausführung dahingehend verbessert werden, daß der Aufwand hinsichtlich Montage und auch Baugröße weiter verkleinert wird. Dies wird dadurch erreicht, daß der Lagerbügel an den Schenkeln in Längsrichtung derselben vom Steg ausgehend hintereinanderliegende Lagerstellen für den Lagerbügel selbst und den Auslösehebel hat, wobei am Steg des Lagerbügels der U-förmig um beide Lagerstellen gebogene Temperaturausgleichsstreifen mit einem Ende starr befestigt ist, dessen anderes Ende am Einstellnocken anliegt. Hierdurch ergibt sich der Vorteil, daß sich bei entsprechender Wahl der Lagerstellen und Kraftverhältnisse der Aussgleichsstreifen am Nocken bei Anlage der Bimetallstreifen am Auslösehebel von selbst anlegt, d.h. es kann hier auf eine zusätzliche Andruckfeder verzichtet werden. Auch hinsichtlich der Grundeinstellung des Schutzrelais ergeben sich Vorteile, wenn der Auslösehebel als Kunststoffteil mit einem über eine Schraube justierbaren Blechwinkel versehen ist. Das Aufsetzen und Halten des Lagerbügels wird wereinfacht, wenn der Lagerbügel am Steg eine zu den Schenkeln hin ausgebogene elastische Zunge hat, die hinter eine Hinterschneidung des Lagerbolzens greift. Eine kompakte, auf geringstem Raum unterbringbare Baueinheit ergibt sich, wenn Auslöse hebel und Temperaturausgleichsstreifen in Steglängsrichtung des Lagerbügels nebeneinander befestigt sind. Mit relativ geringem Kraftaufwand ohne erhebliche Reibungsverluste kann ausgekommen werden, wenn der Auslösehebel ein Winkelhebel ist und die Wirkrichtung vom thermischen Fühler auf den Hebel im wesentlichen parallel zur Schenkellängsrichtung des Lagerbügels liegt.In a protective relay of the aforementioned type known from Siemens magazine 47 (1973), number 4, S 275-278, there is a U-shaped bracket which extends over the entire length of the relay and has two separate lugs on the legs , in which the bearings are provided on the one hand for the bearing bracket itself and on the other hand for the temperature compensation strip. The bearing bracket itself is stored at the end of the bracket; In the middle part, the temperature compensation strip, which is acted upon by the sensors on the one hand and acts on the contact arrangement on the other hand, is pivotably mounted. The other free end of the bracket is against the setting cam of the protective relay. A separate spring is used for this. The invention is intended to improve the known protective relay design in such a way that the outlay in terms of assembly and size is further reduced. This is achieved in that the bearing bracket on the legs in the longitudinal direction of the same, starting from the web, has consecutive bearing points for the bearing bracket itself and the release lever, the U-shaped temperature compensation strip bent rigidly around both bearing locations having one end rigidly attached to the web of the bearing bracket the other end rests on the adjustment cam. This has the advantage that, if the bearing points and force ratios are selected appropriately, the compensating strips on the cam when the bimetal strips are in contact with the release lever automatically attaches, i.e. an additional pressure spring can be dispensed with here. There are also advantages with regard to the basic setting of the protective relay if the release lever is provided as a plastic part with a sheet metal angle that can be adjusted using a screw. The mounting and holding of the bearing bracket is simplified if the bearing bracket on the web has an elastic tongue bent out towards the legs, which engages behind an undercut of the bearing pin. A compact unit that can be accommodated in the smallest space is obtained if the release lever and temperature compensation strips are fastened next to one another in the longitudinal direction of the bearing bracket. With relatively little effort without significant frictional losses can be used if the release lever is an angle lever and the direction of action of the thermal sensor on the lever is substantially parallel to the longitudinal direction of the leg of the bearing bracket.

Anhand der Zeichnung wird ein Ausführungsbeispiel gemäß der Erfindung beschrieben und die Wirkungsweise näher erläutert.An exemplary embodiment according to the invention is described with reference to the drawing and the mode of operation is explained in more detail.

Es zeigen

  • Figur 1 das Schutzrelais bei entfernter Abdeckung, d.h. geöffnetem Zustand in Vorderansicht,
  • Figur 2 eine Schnittdarstellung durch die Ausführung nach Fig 1 gemäß der Linie 11-11 nach Fig.1,
  • Figur 3 eine Schnittdarstellung im Bereich der Auslöseschieber gemäß der Linie III-III nach Fig.1,
  • Figuren 4 und 5 Seitenansicht und Draufsicht auf die als Baueinheit zusammengefügte Auslösemechanik und
  • Figuren 6 und 7 Draufsicht und Seitenansicht auf den gemäß der Erfindung ausgebildeten Lagerbügel mit angeschweißtem Temperaturausgleichsstreifen.
Show it
  • FIG. 1 shows the protective relay with the cover removed, ie in the open state, in a front view,
  • FIG. 2 shows a sectional illustration through the embodiment according to FIG. 1 along the line 11-11 according to FIG. 1,
  • FIG. 3 shows a sectional illustration in the region of the trigger slide according to the line III-III according to FIG. 1,
  • Figures 4 and 5 side view and top view of the trigger mechanism assembled as a structural unit and
  • Figures 6 and 7 plan view and side view of the bearing bracket designed according to the invention with welded temperature compensation strips.

Das aus der Fig. 1 ersichtliche Schutzrelais besteht aus dem Gehäuse 1, in dessen Unterteil die die Fühler darstellenden Bimetallstreifen 2 befestigt sind, die auf Differentialauslöseschieber3 einwirken. Die Differentialauslöseschieber3 stehen über den Differentialhebel4 (Fig.3) mit dem Auslösehebel 5 in Wirkverbindung. Der Auslösehebel 5 ist als Winkelhebel ausgebildet und ist über den Bolzen 6 im U-förmig ausgebildeten Lagerbügel7 schwenkbar gelagert. Die Wirkrichtung des Differentialhebels 4 auf den Arm 8 des Auslösehebels 5 verläuft praktisch parallel zu der Verbindungsstelle der Längsachse des Bolzens 6 und der Längsachse des Lagerzapfens 9 für den U-förmigen Lagerbügel 7. Die Lagerstellen befinden sich in den Schenkeln 10 des Lagerbügels, wohingegen am Steg 11 des Lagerbügels 7 das Ende 12 des U-förmig gebogenen Temperaturausgleichsstreifens 13 angeschweißt ist. Das Ende 14 des Temperaturausgleichsstreifens stützt sich zumindest bei Auslenkung der Bistreifen 2 an den Nocken 15 des Einstellexzenters 16 ab. Hierbei stellt sich der Lagerbügel7 in möglichst gestreckte Lage und der Auslösehebel kommt mit dem Arm 17 mit der Totpunktfeder 18 für die Kontaktanordnung 19 in Eingriff. Zur Einstellung des Auslösepunktes ist an dem Arm 17 über eine Einstellschraube 20 ein Blechwinkel 21 verstellbar angeordnet. Eine weitere Justierschraube 22 dient der Einstellung der Lage für die Totpunktfeder 18. Wie die Fig. 4 zeigt, liegen Temperaturausgleichsstreifen 13 und Auslösehebel 5 in Stegrichtung des Lagerbügels nebeneinander. Der Lagerzapfen 9 für den Lagerbügel 7 ist mit einer Hinterschneidung 23 zu sehen, hinter die eine ausgestanzte Zunge 24 am Steg 11 des Lagerbügels 10 nach Aufsetzen des Lagerbügels einschnappt, so daß keine weiteren Halterungsmittel für den Lagerbügel 7 erforderlich sind. Wie die Fig. 4 und 5 zeigen, kann die Auslösemechanik als Baueinheit vorgefertigt in das Gehäuse 1 eingebracht werden, was den Fertigungsvorgang weiterhin insbesondere im Hinblick auf eine Automatisierung vereinfacht. Die Zeichnung zeigt, daß beim Gegenstand der Erfindung ohne Verwendung von zusätzlichen Federn eine Anlage des Endes 14 des Temperaturausgleichsstreifens 13 am Einstellnocken 15 erfolgt, sofern sich die Differentialschieber 3 in Richtung Auslösung verschieben. Dadurch, daß der Temperaturausgleichsstreifen 13 U-förmig ausgebildet ist und beide Lagerstellen 6 und 9 umgreift, ergibt sich eine kompakte Bauform, so daß das Schutzrelais in einem relativ kleinen Gehäuse untergebracht werden kann.The protective relay shown in FIG. 1 consists of the housing 1, in the lower part of which the bimetallic strips 2, which represent the sensors, are fastened and act on differential trigger slides 3. The differential trigger slide 3 are operatively connected to the trigger lever 5 via the differential lever 4 (FIG. 3). The release lever 5 is designed as an angle lever and is pivotably mounted on the pin 6 in the U-shaped bearing bracket 7. The direction of action of the differential lever 4 on the arm 8 of the release lever 5 runs practically parallel to the connection point of the longitudinal axis of the pin 6 and the longitudinal axis of the bearing pin 9 for the U-shaped bearing bracket 7. The bearing points are located in the legs 10 of the bearing bracket, whereas on Web 11 of the bracket 7, the end 12 of the U-shaped bent temperature compensation strip 13 is welded. The end 14 of the temperature compensation strip is supported on the cams 15 of the adjusting eccentric 16 at least when the bistable 2 is deflected. In this case, the bearing bracket 7 is in the most extended position possible and the trigger lever comes into engagement with the arm 17 with the dead center spring 18 for the contact arrangement 19. To set the trigger point, a sheet metal bracket 21 is adjustably arranged on the arm 17 via an adjusting screw 20. Another adjusting screw 22 is used to adjust the position for the dead center spring 18. As shown in FIG. 4, temperature compensation strips 13 and release lever 5 lie next to one another in the web direction of the bearing bracket. The bearing pin 9 for the bearing bracket 7 can be seen with an undercut 23, behind which a punched-out tongue 24 snaps onto the web 11 of the bearing bracket 10 after the bearing bracket has been fitted, so that no further holding means for the bearing bracket 7 are required. As shown in FIGS. 4 and 5, the trigger mechanism can be inserted as a prefabricated unit into the housing 1, which furthermore particularly affects the manufacturing process Simplified in terms of automation. The drawing shows that in the subject of the invention without the use of additional springs, the end 14 of the temperature compensation strip 13 is in contact with the adjusting cam 15, provided that the differential slides 3 move in the direction of tripping. The fact that the temperature compensation strip 13 is U-shaped and encompasses both bearing points 6 and 9 results in a compact design, so that the protective relay can be accommodated in a relatively small housing.

Claims (5)

1. A tripping device for a thermal protective relay comprising a pivotally mounted, U-shaped bearing bracket (7) for a tripping lever (5) which is adjustable via an adjusting cam and triggers a set of contacts, and connected to a temperature balance strip (13) and to the thermal sensors (2), preferably bimetal strips, characterised in that commencing from the cross-piece (11), the bearing bracket (7) possesses consecutively arranged bearing points for the bearing bracket (7) itself and the tripping lever (5) on the legs (10) in the longitudinal direction thereof, the U-shaped temperature balance strip (13) bent around the two bearing points in U-shaped fashion being rigidly secured to the crosspiece (11) of the bearing bracket (7) by one end (12), and the other end (14) of the temperature balance strip being adjacent to the adjusting cam (15).
2. A protective relay as claimed in Claim 1, characterised in that the tripping lever (5) is a plastic member provided with a sheet-metal elbow (21) adjustable by means of a screw (20).
3. A protective relay as claimed in Claim 1 or 2, characterised in that on the cross-piece (11) the bearing bracket (7) possesses a flexible tongue (24) bent out towards the legs (10) and engaging behind an undercut (23) of the bearing pin (9).
4. A protective relay as claimed in Claim 1, 2 or 3, characterised in that the tripping lever (5) and the temperature balance strip (13) are fixed beside one another in the longitudinal direction of the cross-piece of the bearing bracket (7).
5. A protective relay as claimed in one or more of the preceding Claims, characterised in that the tripping lever (5) is an angle lever and the direction of action of the sensor (2) on the tripping lever (5) is essentially parallel to the longitudinal direction of the legs of the bearing bracket (7).
EP80101602A 1979-04-11 1980-03-26 Release mechanism for a thermal protection relay Expired EP0017813B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2914776A DE2914776C2 (en) 1979-04-11 1979-04-11 Trigger for a thermal protection relay
DE2914776 1979-04-11

Publications (2)

Publication Number Publication Date
EP0017813A1 EP0017813A1 (en) 1980-10-29
EP0017813B1 true EP0017813B1 (en) 1983-01-26

Family

ID=6068130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80101602A Expired EP0017813B1 (en) 1979-04-11 1980-03-26 Release mechanism for a thermal protection relay

Country Status (8)

Country Link
US (1) US4321573A (en)
EP (1) EP0017813B1 (en)
JP (1) JPS5929939B2 (en)
AR (1) AR218199A1 (en)
BR (1) BR8002178A (en)
DE (1) DE2914776C2 (en)
ES (1) ES8101316A1 (en)
IN (1) IN153469B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19904539C1 (en) * 1999-02-04 2000-03-09 Siemens Ag Dead-centre switch arrangement

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56100853U (en) * 1979-12-29 1981-08-08
EP0097344B1 (en) * 1982-06-22 1991-04-17 Licentia Patent-Verwaltungs-GmbH Excess current thermal relay
JPS61121133U (en) * 1985-01-14 1986-07-30
JPH0316509Y2 (en) * 1985-05-23 1991-04-09
US4806897A (en) * 1987-12-17 1989-02-21 Eaton Corporation Overload relay having adaptive differential mechanism
JPH03106951U (en) * 1990-02-19 1991-11-05
DE29615688U1 (en) * 1996-09-09 1996-10-31 Siemens Ag Insertable snap mechanism
KR100550732B1 (en) * 1999-04-02 2006-02-08 후지 덴키 가부시끼가이샤 Thermal Overload Tripping Device for Circuit Breaker
KR100400779B1 (en) * 2001-11-12 2003-10-08 엘지산전 주식회사 structure for preventing malfunction of Thermal Overload Relay
JP5152102B2 (en) * 2009-03-27 2013-02-27 富士電機機器制御株式会社 Thermal overload relay
JP4798243B2 (en) * 2009-03-27 2011-10-19 富士電機機器制御株式会社 Thermal overload relay
JP4978681B2 (en) * 2009-10-23 2012-07-18 富士電機機器制御株式会社 Thermal overload relay

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Publication number Priority date Publication date Assignee Title
GB543189A (en) * 1940-08-12 1942-02-13 Crabtree & Co Ltd J A Improvements in and connected with contact mechanism for automatic circuit breakers and similar electrical switchgear
FR1354107A (en) * 1961-03-07 1964-03-06 Improvements to thermal differential relays for electrical protection
FR1370075A (en) * 1963-07-08 1964-08-21 Comp Generale Electricite Differential relay
GB1399401A (en) * 1972-01-11 1975-07-02 Cutler Hammer Inc Electric switches
US4047140A (en) * 1975-12-23 1977-09-06 Westinghouse Electric Corporation Thermal overload relay
US4147999A (en) * 1977-12-19 1979-04-03 Westinghouse Electric Corp. Circuit breaker
JPS5942927B2 (en) * 1977-12-29 1984-10-18 富士電機株式会社 Thermal overload relay

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19904539C1 (en) * 1999-02-04 2000-03-09 Siemens Ag Dead-centre switch arrangement
DE19904539C2 (en) * 1999-02-04 2002-02-07 Siemens Ag dead center

Also Published As

Publication number Publication date
JPS55146833A (en) 1980-11-15
JPS5929939B2 (en) 1984-07-24
IN153469B (en) 1984-07-21
AR218199A1 (en) 1980-05-15
ES490434A0 (en) 1980-12-01
US4321573A (en) 1982-03-23
ES8101316A1 (en) 1980-12-01
DE2914776C2 (en) 1981-07-02
BR8002178A (en) 1980-11-25
DE2914776B1 (en) 1980-07-17
EP0017813A1 (en) 1980-10-29

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