EP0562287B1 - Appareil de commande de puissance - Google Patents

Appareil de commande de puissance Download PDF

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Publication number
EP0562287B1
EP0562287B1 EP93102723A EP93102723A EP0562287B1 EP 0562287 B1 EP0562287 B1 EP 0562287B1 EP 93102723 A EP93102723 A EP 93102723A EP 93102723 A EP93102723 A EP 93102723A EP 0562287 B1 EP0562287 B1 EP 0562287B1
Authority
EP
European Patent Office
Prior art keywords
cam
switching
control apparatus
bimetal
output
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
EP93102723A
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German (de)
English (en)
Other versions
EP0562287A1 (fr
Inventor
Jürgen Quiner
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.)
Haschkamp geb Dreefs Ernestine
Haschkamp Wolfgang Dipl-Kfm
Original Assignee
Haschkamp geb Dreefs Ernestine
Haschkamp Joachim Dipl-Ing
Haschkamp Wolfgang Dipl-Kfm
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 Haschkamp geb Dreefs Ernestine, Haschkamp Joachim Dipl-Ing, Haschkamp Wolfgang Dipl-Kfm filed Critical Haschkamp geb Dreefs Ernestine
Publication of EP0562287A1 publication Critical patent/EP0562287A1/fr
Application granted granted Critical
Publication of EP0562287B1 publication Critical patent/EP0562287B1/fr
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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
    • H01H37/12—Means for adjustment of "on" or "off" operating temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits

Definitions

  • the invention relates to a power control device with pulsed switch-on and switch-off, in which the ratio between switch-on time and switch-off time can be adjusted from a zero value, which determines the switch-off position, to a maximum power value via a control element in that a heated bimetal , which acts on a snap switch, can be lifted out by a control cam seated on an actuating shaft (DE-A-2 422 686).
  • the power to be supplied to the consumer is set here via a control curve, which acts on the bimetal control.
  • Known power control devices of this type control the power from about 7% to full load of 100%.
  • the 7% output was the lowest achievable output level so far, which for example forms the warming level for a hotplate.
  • 7% is often too much to keep warm and that energy is unnecessarily consumed.
  • a lower power level can only be set with a very large adjustment effort or not at all, because the manufacturing tolerances which occur in practice, in particular with the snap switch, make an adjustment difficult or impossible.
  • an expansion rod is used as the expansion member instead of a bimetal, which acts with one end directly on the actuation point of a snap spring of the snap switch and is supported with the other end on a transmission lever, the short expansion rod and the transmission lever being pressed against one another under spring force and against the adjusting element and the snap spring and the bearing of the transmission lever being free of dead travel Bearing is carried out with elimination of elasticities in the working area on the rigid housing.
  • both low and high partial power ranges are to be controlled perfectly. This is also intended to achieve a reproducible association between the set performance value and the resulting partial performance.
  • the object of the invention is to render the switching hysteresis preventing the reduction in power ineffective in the case of switches which have been working with bimetallic elements and to provide a power control device which is capable of reliably and reproducibly controlling small partial powers even in the area of the lowest power.
  • the power control device is used for the controllable supply of electrical power in power pulses to a consumer, in particular to a hotplate.
  • the power control device is designed as a cam switch, which has a switch housing 10 with a cover cap 11 and rotatably supports an actuating shaft 12, on which a hollow camshaft 14 is rotatably mounted, which carries switching cams 16 for the main contacts 18 in a known manner.
  • the camshaft 14 also has a locking cam disk 20, which is provided with a locking recess 22 for the off position, a locking recess 24 for 5% output and a locking recess 26 for 100% output.
  • a spring-loaded locking plunger 28 is located in the locking recesses.
  • a control cam disk 30 On the end of the camshaft 14 opposite the latching cam disk 20 there is a control cam disk 30, on the outer circumference of which a cam follower 32 runs.
  • This cam follower is carried by an arm 34 which is connected to a yoke 36 which is pivotable about an axis 38 mounted in the housing parallel to the actuating shaft 12.
  • Another yoke 40 can be pivoted about the same axis 38 and has a leaf spring and an arm with a stop angle 44 in the manner of a cantilever.
  • a bearing bracket 46 of the arm 34 Above the stop bracket 44 is a bearing bracket 46 of the arm 34, which has an internal thread with an adjusting screw 48.
  • An extension spring 52 is anchored to an extension 50 of the arm 34 and engages the housing with its other end and prestresses the head of the adjusting screw 48 against the stop angle 44.
  • a switching bimetal 54 provided with a heating winding can be pivoted at one end about an axis lying below the axis 38 and extends essentially parallel to the leaf spring 42.
  • a pin 56 fixed to the bimetal 54 bears against the leaf spring 42 with its end.
  • the bimetal 54 acts on the contact spring 58 of the snap spring contacts 60.
  • the radial cam track of the control cam disk 30 has a section 62 with the smallest radius. If the cam follower 32 is located on this section, the switch is in the zero position and the latching follower 28 fixes the rotational position of the actuating shaft by engaging in the middle latching recess 22 of the latching cam disk 20.
  • the section 62 goes on the one hand into a switch cam 64 and on the other hand into one Control cam 66 over.
  • the control cam 68 adjoins the cam 64 with its radially lowest point 70. This is the position for 5% power (position according to FIG. 9). This position, as can be seen from FIG. 10, is locked in that the locking plunger 28 engages in the locking recess 24.
  • the control cam 68 rises from this point 70 to the control cam 66. When the cam follower is raised by this control cam 66, the actuating shaft is fixed by the engagement of the latching follower 28 in the recess 22. This is the 100% performance position.
  • the power controller according to the invention works as follows:
  • the actuating shaft is in the zero position, ie the main contacts 18 are interrupted and the snap spring contact 60 is lifted off its counter contact 72.
  • the locking plunger 28 lies in the central locking recess 22.
  • the cam tappet 32 lies in the section 62 of the control cam disk 30 between the cams 64 and 66.
  • the spring 52 pulls the adjusting screw 48 against the stop angle 44 and the leaf spring 42 presses on the pin 56 on the Bimetal 54, which in turn presses on the contact spring 58 and lifts the contact 60 from the counter-contact 72 against the action of the snap spring. If the actuating shaft is now rotated clockwise, the cam follower 32 runs on the switching cams 64, the main contacts 18 being closed via the switching cams 16 (transition position according to FIGS. 4 and 5).
  • the lifting of the cam follower has the result that the leaf spring 42 releases the bimetal and the snap spring contact 60, 62 with Security closes. From this position, the actuating shaft is pushed via the locking plunger into the locking position 24, in which, according to FIG.
  • the bimetal 54 is provided with a heating winding which is live as long as the contacts 60, 72 are closed. Heating the bimetal causes it to deform and cause the contacts 60, 72 to open.
  • the further the cam follower 32 is raised above the control cam when the actuating shaft continues to rotate, the longer the snap spring contacts 60, 72 remain closed.
  • the cam follower rests on the control cam 66 latching follower 28 is located in the latching recess 26
  • the contacts 60, 72 remain permanently closed.
  • FIG. 3 shows a circuit in which it is necessary that the main contacts 18 have already closed when the bimetal control is at the highest point of the cam 64.
  • a hotplate 74 is provided, which is in series with the main switch contact 18 and the snap switch 60, 72 in voltage.
  • An operating indicator lamp 76 is connected to voltage via a signal contact 78.
  • a safety indicator lamp 80 is also provided, which is energized via a thermal contact 82 when the hotplate or the corresponding ceramic field is at a temperature exceeding a predetermined temperature. So that when the hotplate is switched on, the safety indicator lamp 80 comes on immediately, even if the contact 82 for the hot display in the thermostat is not yet closed, a bridge 84 is provided, by means of which the safety indicator lamp 80 is excited via the main switch contact 18.
  • connection bridge 84 there is no connection bridge 84.
  • main switch contacts 18 and signal contacts 78 should be open in the intermediate position in which the bimetal control is at the highest point of the control cam disk (see FIGS. 7 and 8).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Resistance Heating (AREA)
  • Thermally Actuated Switches (AREA)
  • Control Of Temperature (AREA)

Claims (8)

  1. Appareil de commande de puissance à ouverture et à fermeture pulsée dans lequel le rapport entre la durée de fermeture et la durée d'ouverture peut être réglé par l'intermédiaire d'un élément de réglage (12, 14, 20, 30), depuis une valeur zéro correspondant à la position d'ouverture jusqu'à une valeur maximale en passant par un palier de puissance très faible, grâce à un bilame (42) chauffé qui agit sur un commutateur (58, 60, 72) à coupure brusque et peut être décollé au moyen d'une came (30) de commande montée sur un arbre de réglage (12), caractérisé par le fait qu'une zone avec un palier de puissance qui se situe entre le palier de puissance le plus faible et le palier de puissance le plus élevé est insérée dans la zone de commutation de l'élément de réglage (12, 14, 20, 30), entre la position de coupure et le palier de puissance le plus faible.
  2. Appareil de commande de puissance selon la revendication 1, dans lequel le bilame (42) chauffé peut être décollé par le biais d'un poussoir (32) par la came de commande (30) montée sur l'arbre de réglage (12), caractérisé par le fait que le chemin de la came de commande présente une came de commutation (64) élevée, entre un segment (62) très bas correspondant au point zéro et le point (70) le plus bas de la courbe de commande (68).
  3. Appareil de commande de puissance selon les revendications 1 et 2, comportant un commutateur à came dont l'arbre (14) peut être arrêté dans différentes positions angulaires au moyen d'un doigt d'arrêt (28), caractérisé par le fait que la position du poussoir (32) voisine de la came (64) (plus faible palier de puissance) peut être verrouillée.
  4. Appareil de commande de puissance selon l'une des revendications précédentes, caractérisé par le fait que le palier intermédiaire prévu entre la position zéro et le palier de puissance le plus faible est situé à 30-50 % de la pleine puissance.
  5. Appareil de commande de puissance selon l'une des revendications précédentes, caractérisé par le fait que les contacts principaux (18) sont encore ouverts, lorsque la commande à bilame déclenchée par le poussoir (32) se trouve au point le plus élevé de la came (64) de commutation.
  6. Appareil de commande de puissance selon l'une des revendications précédentes, caractérisé par le fait que les contacts principaux (18) sont déjà fermés, lorsque la commande à bilame déclenchée par le poussoir (32) se trouve au point le plus élevé de la came (64) de commutation.
  7. Appareil de commande de puissance selon la revendication 6, caractérisé par le fait qu'un voyant (80) d'indication de chauffage est mis en service par le contact principal (18) par l'intermédiaire d'un pont (84) qui peut être interrompu par un thermo-contact (82) monté en parallèle avec les contacts principaux (18).
  8. Appareil de commande de puissance selon l'une des revendications précédentes, caractérisé par le fait que le doigt d'arrêt (28) a passé le point le plus haut de l'encoches lorsque la commande à bilame se trouve au point le plus haut de la came de commutation (64).
EP93102723A 1992-03-23 1993-02-20 Appareil de commande de puissance Expired - Lifetime EP0562287B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4209362 1992-03-23
DE4209362A DE4209362A1 (de) 1992-03-23 1992-03-23 Leistungssteuergerät

Publications (2)

Publication Number Publication Date
EP0562287A1 EP0562287A1 (fr) 1993-09-29
EP0562287B1 true EP0562287B1 (fr) 1996-10-23

Family

ID=6454778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93102723A Expired - Lifetime EP0562287B1 (fr) 1992-03-23 1993-02-20 Appareil de commande de puissance

Country Status (2)

Country Link
EP (1) EP0562287B1 (fr)
DE (2) DE4209362A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6365988B1 (en) 1998-12-04 2002-04-02 Dreefs Gmbh Schaltgerate Und Systeme Power controller for setting the power of the electrical loads of an electrical appliance
DE29821663U1 (de) * 1998-12-04 1999-05-20 Dreefs Gmbh Schaltgeraete Leistungssteller zur Leistungseinstellung der elektrischen Verbraucher eines Elektrogerätes

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2310867C3 (de) * 1973-03-05 1981-11-05 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Steuergerät für Elektrokochplatten
DE2422686C3 (de) * 1974-05-10 1978-04-20 Karl 7519 Oberderdingen Fischer Leistungssteuergerät für Elektrokoch- oder -wärmegeräte
DE2650824A1 (de) * 1976-11-06 1978-05-11 Licentia Gmbh Energieregler fuer elektrokochplatten

Also Published As

Publication number Publication date
DE59304235D1 (de) 1996-11-28
DE4209362A1 (de) 1993-09-30
EP0562287A1 (fr) 1993-09-29

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