EP0647957B1 - Coupe-circuit thermique avec un mécanisme à déclenchement libre - Google Patents

Coupe-circuit thermique avec un mécanisme à déclenchement libre Download PDF

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Publication number
EP0647957B1
EP0647957B1 EP19930810713 EP93810713A EP0647957B1 EP 0647957 B1 EP0647957 B1 EP 0647957B1 EP 19930810713 EP19930810713 EP 19930810713 EP 93810713 A EP93810713 A EP 93810713A EP 0647957 B1 EP0647957 B1 EP 0647957B1
Authority
EP
European Patent Office
Prior art keywords
rocker
base plate
contact portion
temperature limiter
bar
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
EP19930810713
Other languages
German (de)
English (en)
Other versions
EP0647957A1 (fr
Inventor
Alfred Reifers
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.)
ETHECO EUROPEAN THERMOSTAT COMPANY
Original Assignee
ETHECO European Thermostat 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
Application filed by ETHECO European Thermostat Co filed Critical ETHECO European Thermostat Co
Priority to DE59300293T priority Critical patent/DE59300293D1/de
Priority to EP19930810713 priority patent/EP0647957B1/fr
Publication of EP0647957A1 publication Critical patent/EP0647957A1/fr
Application granted granted Critical
Publication of EP0647957B1 publication Critical patent/EP0647957B1/fr
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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2671—Means to detect leaks in the pressure sensitive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means
    • H01H2037/705—Resetting means wherein the switch cannot be closed when the temperature is above a certain value

Definitions

  • the invention relates to a temperature limiter mentioned in the preamble of claim 1.
  • Temperature limiters can be used to monitor heat generation systems and to switch them off in the event of an excessive temperature rise. A temperature limiter remains blocked after it is switched off until it is switched on again manually. A reset button is usually used for this. Temperature limiters are partly with extended safety functions such as an actuation safety device or breakage safety device. The actuation safety device ensures that the system monitored by the temperature limiter cannot be switched on as long as the reset button is pressed.
  • a temperature limiter according to the preamble of claim 1 is known as RAK series 08 from the data sheet CE1P1147 D from Landis & Gyr from April 1989. With this temperature limiter, the actuation safety function is implemented by means of an additional switch which interrupts the current path each time the reset button is pressed.
  • the invention has for its object to realize a temperature limiter with an actuation safety device without additional parts such as switches.
  • Fig. 1 shows a section of a temperature limiter in the operational ON position
  • the switching mechanism is constructed in a manner known per se on the interaction of a drive element 1, a spring clip 2, a tilting system 3 and a correspondingly designed geometric shape of a base plate 4.
  • the spring clip 2 shows the top view of the spring clip 2, which consists of a U-shaped frame 5 and a beam 6, one end of which, for example, via two spring bars 7 resiliently mounted in the arch of the frame 5 and the other end is free.
  • a cam 8 and a spring terminal contact piece 9 are attached at the free end.
  • the frame 5 contains bores 10a and 10b for fastening the spring clip 2 on the base plate 4 (Fig. 1).
  • FIG. 3 shows the top view of a rocker switch 12 which is designed as a rectangular leaf spring 12a with a tongue 12b punched out along the long side.
  • a rocker contact piece 13 On one narrow side of the leaf spring 12a at the fixed end of the tongue 12b there is a rocker contact piece 13 and on the other narrow side of the leaf spring 12a opposite the free end of the tongue 12b there is a rectangular recess 12c. Between this recess 12c and the free end of the tongue 12b, the leaf spring 12a is provided with a V-shaped embossment across the leaf spring 12a, which serves as the drive point 12d of the tilting system 3 (FIG. 1).
  • the tilting system 3 in FIG. 1 consists of a support 11 arranged rigidly on the base plate 4, which has a first and a second cutting edge bearing 11a or 11b, and of the rocker switch 12a, b, d.
  • the rocker switch 12 (FIG. 3) is suspended with its recess 12c in the first cutter bearing 11a and is supported with the free end of the tongue 12b in the second cutter bearing 11b of the carrier 11 in such a way that the leaf spring 12a is under tension.
  • the bistable tilting system 3 thus formed tilts from one stable state to the other stable state when the leaf spring 12a is pressed from one side of the second cutting edge bearing 11b over the support point of the tongue 12b in the second cutting edge bearing 11b.
  • the spring clamp 2 and the support 11 are fastened to the base plate 4 in such a way that in the operational ON position of the temperature limiter, the spring clamp 2 acts on the drive point 12d of the tilting system 3 via the cams 8 and that the spring clamp contact piece 9 and the rocker contact piece 13 have a closed one make electrical contact.
  • the drive element 1 is installed in the base plate 4 in such a way that it can be displaced along a y-axis 14.
  • a sensor system 15 filled with an expansion material determines the position of the drive element 1 on the y-axis 14 as a function of the temperature.
  • the drive element 1 acts approximately in the middle of the beam 6 (FIG.
  • the actuation safety is based on a mechanism in which a reset button 18 acts when actuated via a first element on the bar 6 with the spring terminal contact piece 9 and via a second element on the switching rocker 12 with the rocker contact piece 13 in such a way that between the rocker contact piece 13 and the spring terminal contact piece 9 a distance arises and the electrical contact between the rocker switch 12 and the spring terminal 2 is interrupted.
  • actuation safety can be achieved inexpensively solely by constructive measures using the spring clamp 2 which is necessary anyway for break safety. It is therefore possible to dispense with an additional switch, which is necessary only for the safety of actuation and which interrupts the current path of the temperature limiter when the reset button 18 is actuated. This simplifies and reduces the cost of manufacturing the temperature limiter.
  • the force of the drive element 1 on the bar 6 of the spring clamp 2 is advantageously reduced, so that the spring clamp 2 relaxes and returns to its rest position.
  • the electrical contact between the spring terminal contact piece 9 and the rocker contact piece 13 opens, the switching rocker 12 being prevented mechanically by the stop element 17 from following the spring terminal contact piece 9 in its rest position. This mechanism ensures that the temperature limiter is unbreakable.
  • the temperature limiter has a cover 21 which can be fastened on the base plate 4 to protect the electrical switching device formed from the spring terminal 2 and the tilting system 3.
  • a particularly advantageous embodiment combines the reset button 18 and the two actuating elements in one part as a plunger with two stepped steps 19, 20.
  • a spring 23 inserted between a stop of the reset button 18 and the cover 21 prevents the reset button 18 from interfering with the tilting system 3 in its movement.
  • the reset button 18 is pressed in against the force of the spring 23, the first step 19 comes to rest on the bar 6 and then the second step 20 on the rocker switch 12.
  • the bar 6 has, for example, two extensions 6a and 6b (FIG. 2), which serve as a contact surface for the reset button 18.
  • the two stages 19 and 20 are formed at a distance a such that the reset button 18 removes the bar 6 from the stop surface 16 before the switching rocker 12 tilts back pushes the OFF position into the ON position so far that even after the rocker switch 12 tilts back into the ON position, a distance remains between the contact pieces 9 and 13 and the electrical contact between the spring terminal 2 and the rocker switch 12 is reliably interrupted ; the reset is actuation-safe, ie each time the reset button 18 is pressed in, the current path of the temperature limiter is interrupted, so that the system monitored with it cannot be operated electrically.
  • the actuation safety function can also be implemented in such a way that the two actuation elements form part of a lever arm which is resiliently attached to the cover 21 and can be actuated via the reset button 18.
  • a particularly robust construction which in any case forces the electrical contact between the contact pieces 9 and 13 to be interrupted when the reset button 18 is actuated, can be realized in that the rocker switch 12 is designed in such a way that it in turn lies advantageously on the stop element 17, when the spring clip contact piece 9 is pushed out of its normal working position, so that the rocker contact piece 13 and the spring clip contact piece 9 are electrically separated.
  • the stop element 17 is designed as part of the base plate 4.
  • the switch of the temperature limiter is advantageously designed as a changeover switch, which consists of the spring terminal contact piece 9 and an OFF contact piece 22 fastened to the base plate 4, and the rocker contact piece 13 is riveted onto the leaf spring 12a in such a way that the rocker contact piece is in the OFF position 13 and the OFF contact piece 22 are electrically short-circuited, so that the position of the rocker switch 12 can be monitored electrically.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermally Actuated Switches (AREA)

Claims (7)

  1. Limiteur de température comportant un élément d'entraînement (1) pour un élément de sonde (15), comportant un bouton de réarmement (18) et un contact de commutation électrique formé d'une pièce de contact de borne à ressort (9) sur la barre (6) d'une borne à ressort (2) et d'une pièce de contact à bascule (13) sur la bascule de commutation (12) d'un système à bascule (3) bistable avec une position MARCHE et une position ARRET, le système à bascule (3) se trouvant en position ARRET et le contact de commutation (9, 13) étant ouvert, après dépassement d'une température limite sur l'élément de sonde (15), caractérisé en ce qu'une plaque de base (4) est prévue pour servir d'élément de fixation pour le système à bascule (3) et pour la borne à ressort (2), en ce que sur la plaque de base (4) est prévu un élément de butée (17) avec une surface d'application (16) pour l'extrémité libre de la barre (6), qui fixe la position normale de la pièce de contact de borne à ressort (9), soulevée par un élément d'entraînement (1) de la plaque de base (4), et de la barre (6), en ce que le mouvement de la bascule de commutation (12) est limité par un moyen (9 ou 17) dans la position MARCHE, en direction de la plaque de base (4), et en ce que le bouton de réarmement (18) présente une position de repos et deux éléments d'actionnement (19 ; 20) pour déplacer la barre (6) et pour actionner la bascule de commutation (12), sachant que pendant l'actionnement du bouton de réarmement (18), afin d'empêcher un contact entre les deux pièces de contact (9 ; 13), le premier élément d'actionnement (19) éloignant l'extrémité libre de la barre (6), de la surface d'application (16), avant qu'au moyen du second élément d'actionnement (20), la bascule de commutation (12) passe de la position ARRET dans la position MARCHE.
  2. Limiteur de température selon la revendication 1, caractérisé en ce que le bouton de réarmement (18) est un poussoir qui comporte comme éléments d'actionnement deux crans (19 ; 20) étagés d'une distance (a) prédéterminée.
  3. Limiteur de température selon les revendications 1 ou 2, caractérisé en ce que le mouvement de la bascule de commutation (12) est limité par la pièce de contact de bascule (13) ou par l'élément de butée (17) dans la position MARCHE, en direction de la plaque de base (4).
  4. Limiteur de température selon l'une des revendications 1 à 3, caractérisé en ce que l'élément de butée (17) fait partie intégrante de la plaque de base (4).
  5. Limiteur de température selon l'une des revendications 1 à 4, caractérisé en ce que dans la position ARRET, le mouvement de la bascule de commutation (12) dans une direction opposée à la plaque de base (4), est limité par une pièce de contact ARRET (22).
  6. Limiteur de température selon la revendication 5, caractérisé en ce que dans la position ARRET, la pièce de contact de bascule (13) de la bascule de commutation (12) et la pièce de contact ARRET (22) forment un contact électrique.
  7. Limiteur de température selon l'une des revendications 1 à 6, caractérisé en ce que le contact électrique entre la pièce de contact de borne à ressort (9) et la pièce de contact de bascule (13) est interrompu, dès qu'à la suite d'une défaillance de la sonde de température (15), l'élément d'entraînement (1) n'exerce aucune force sur la barre (6) et la borne à ressort (2) se détend.
EP19930810713 1993-10-12 1993-10-12 Coupe-circuit thermique avec un mécanisme à déclenchement libre Expired - Lifetime EP0647957B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59300293T DE59300293D1 (de) 1993-10-12 1993-10-12 Sicherheitstemperaturbegrenzer mit Freiauslösemechanismus.
EP19930810713 EP0647957B1 (fr) 1993-10-12 1993-10-12 Coupe-circuit thermique avec un mécanisme à déclenchement libre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19930810713 EP0647957B1 (fr) 1993-10-12 1993-10-12 Coupe-circuit thermique avec un mécanisme à déclenchement libre

Publications (2)

Publication Number Publication Date
EP0647957A1 EP0647957A1 (fr) 1995-04-12
EP0647957B1 true EP0647957B1 (fr) 1995-06-21

Family

ID=8215042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930810713 Expired - Lifetime EP0647957B1 (fr) 1993-10-12 1993-10-12 Coupe-circuit thermique avec un mécanisme à déclenchement libre

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EP (1) EP0647957B1 (fr)
DE (1) DE59300293D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005043255B3 (de) * 2005-09-09 2007-01-04 Simplex Armaturen + Fittings Gmbh & Co. Kg Ventilarmatur für Niedertemperaturheizungen mit einem Rücklauftemperaturbegrenzer
ITMI20060454U1 (it) * 2006-12-21 2008-06-22 T & G Spa Termostato limitatore perfezionato
CN114779852B (zh) * 2022-04-28 2023-10-31 徐州凯特电器设备有限公司 一种可自断电的智能温控器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH345684A (de) * 1956-07-30 1960-04-15 Landis & Gyr Ag Temperaturbegrenzer mit thermisch ausgelöstem Kippschalter
DE1180026B (de) * 1958-04-09 1964-10-22 Licentia Gmbh Waermeschalter mit einem Sprungschaltwerk
DE2605465A1 (de) * 1976-02-12 1977-08-18 Emerson Electric Gmbh Elektrischer schalter mit thermischer sicherheitsausloesung und von hand betaetigtem rueckstellmechanismus
DE3010445A1 (de) * 1979-03-30 1980-10-09 Ego Regeltech Temperaturregler mit einem schnappschalter und einem ausdehnungsglied

Also Published As

Publication number Publication date
DE59300293D1 (de) 1995-07-27
EP0647957A1 (fr) 1995-04-12

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