EP0593796B1 - Dispositif de commutation à commande thermique - Google Patents

Dispositif de commutation à commande thermique Download PDF

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Publication number
EP0593796B1
EP0593796B1 EP19920117774 EP92117774A EP0593796B1 EP 0593796 B1 EP0593796 B1 EP 0593796B1 EP 19920117774 EP19920117774 EP 19920117774 EP 92117774 A EP92117774 A EP 92117774A EP 0593796 B1 EP0593796 B1 EP 0593796B1
Authority
EP
European Patent Office
Prior art keywords
temperature
switching device
controlled switching
adjustment
spring element
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
EP19920117774
Other languages
German (de)
English (en)
Other versions
EP0593796A1 (fr
Inventor
Theodor Walter
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 Co SpA
Electrowatt Technology Innovation AG
Original Assignee
Landis and Gyr Bussiness Support 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 Landis and Gyr Bussiness Support AG filed Critical Landis and Gyr Bussiness Support AG
Priority to DE59208407T priority Critical patent/DE59208407D1/de
Priority to EP19920117774 priority patent/EP0593796B1/fr
Publication of EP0593796A1 publication Critical patent/EP0593796A1/fr
Application granted granted Critical
Publication of EP0593796B1 publication Critical patent/EP0593796B1/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
    • H01H37/12—Means for adjustment of "on" or "off" operating temperature

Definitions

  • the invention relates to a temperature-controlled switching device according to the preamble of claim 1.
  • Temperature-controlled switching devices are used as temperature monitors and limiters for monitoring heat generation systems and for switching them off in the event of an excessive temperature rise. While a temperature monitor switches itself on again after it has been switched off and the temperature has dropped sufficiently low, a temperature limiter remains blocked until it is switched on again manually. Depending on the type of system, temperature monitors or temperature limiters are used.
  • switching devices are designed so that after installation in a system, they can only be adjusted in the direction of greater security, i.e. only in the direction of a lower switching temperature.
  • a temperature-controlled switching device which is equipped with a setpoint adjustment that can only be adjusted according to lower switching temperatures.
  • This switching device uses a latching device which is designed as a disk connected to an adjusting threaded bolt with recesses for the lateral engagement of a latching spring.
  • the disadvantage of this arrangement is that the force of the detent spring presses laterally on the axis of the adjusting screw, and thus interferes with the sensitive switching point setting of the switching device.
  • the object of the invention is to provide a temperature-controlled switching device with a setpoint adjustment, which has a latching device which only allows setpoint adjustments after lower switching temperatures and in which the forces of the latching device do not exert any lateral pressure on the axis of the adjusting screw bolt.
  • the solution uses a number of axially deflectable spring elements which are arranged uniformly over the circumference of a circle surrounding the axis of the adjusting screw bolt.
  • the advantage of the invention is that the switching point stability of the switching device is improved.
  • Another advantage of the invention is that when using several spring elements, additional functional reliability is achieved, since an adjustment of the locking device in the direction of higher switching temperatures is blocked by the multiple engagement of the spring elements in the locking profile.
  • a temperature-controlled switching device 1 is shown in FIG. This contains a temperature-dependent displacement sensor 2, an electrical switch 3 controlled by the latter, a setpoint sensor with an adjusting threaded bolt 4 adjustable about an axis D for changing the switching temperature (nominal value adjustment) electrical switch 3 and an effective locking device between the adjusting screw 4 and the temperature-controlled switching device 1.
  • a temperature probe and a capillary tube which are connected to the temperature-dependent displacement sensor 2, are not shown.
  • the task of the temperature probe, capillary tube and displacement sensor 2 is to convert the current temperature in the heat generation system into a heat-dependent expansion (displacement).
  • the locking device consists essentially of an adjusting threaded bolt 4, on which a disc 5 is placed, an adjusting button 6, which is placed on the disc 5, a spring element disc 7 with spring elements 8 and one via the adjusting knob 6 and the spring element disc 7 on Housing 9 scale scale 10.
  • the adjusting screw is guided by a left-hand thread 11.
  • the disc 5 (see also FIG. 7) has parts of its edge with a toothing 12 and thus engages in an internal toothing 13 of the adjusting knob 6 plugged onto the disc 5, which is attached to the entire circumference thereof. In this way, the adjusting knob 6 and the disc 5 are connected to one another in a non-rotatable manner.
  • the adjustment knob 6 is preferably made of a suitable plastic material and also has a recess 14 on its edge resting on the housing 9 (see also FIG.
  • the adjustment button 6 also has driver lugs 17 which serve to prevent rotation of the spring element disc 7 with respect to the adjusting knob 6.
  • a setting mark, for example in the form of an arrow 18, is also attached to the part of the adjusting knob 6 which is visible from the outside in the assembled state (see also FIGS. 6 and 8).
  • the spring element disk 7 (see FIGS. 2 and 3) is placed on the adjusting button 6. Because of the driving lug 17, the spring element disc 7 is non-rotatably connected to the adjustment button 6.
  • the spring element disc 7 has a number of spring elements 8 which are arranged uniformly over the circumference of a circle surrounding the axis D.
  • the embodiment shown has three spring elements 8.
  • the scale pot 10 is placed on the adjustment button 6 and the spring element disk 7.
  • the scale pot 10 has a locking profile 19 on its inside.
  • the spring elements 8 engage in the latching profile 19 in such a way that the deflection of the individual spring elements 8 always takes place axially, that is to say essentially parallel to the axis D of the adjusting threaded bolt 4 (see also FIG. 9).
  • the scale pot 10 is provided with a number of elastic fastening tongues 20 (see also FIG. 5) which latch into recesses 21 of the housing 9 provided for this purpose and thereby connect the scale pot non-rotatably to the housing 9.
  • the scale pot 10 holds the spring element disk 7 and the adjustment button 6 in their mounting positions. No additional fasteners are therefore necessary. Adjustment marks 28, 29, 30 are also attached to the scale pot 10 (see FIG. 8).
  • the spring element disc 7 with the spring elements 8 is shown in detail.
  • the individual spring elements 8 are designed as axially bent circular arc parts. Preferably three spring elements 8 are used, although it can be both more and less. Three spring elements 8 result in a symmetrical distribution of forces with good manufacturability.
  • FIG. 4 shows the adjustment button 6, which has an internal toothing 13 on its entire inner circumference, which is slightly beveled downwards and outwards in the lower part, so that the adjustment button 6 can be better plugged onto the disk 5.
  • the recess 14 extends from a first edge 24 to a second edge 25.
  • the angular distance between the groove 15, which marks the calibration temperature, and the first edge 24 is just large enough to correspond to the difference between the calibration temperature and the maximum adjustable switching temperature .
  • the second edge 25 corresponds to the minimum adjustable switching temperature of the temperature-controlled switching device.
  • the characteristic of the change in switching temperature as a function of the angle of rotation of the adjusting screw 4 is known since both the characteristic of the temperature-dependent displacement sensor 2 and the thread pitch of the adjusting screw 4 are known.
  • the scale pot 10 with its fastening tongues 20 is shown in FIG. 5. Since the scale pot 10 is also preferred is made of plastic, it is sufficient if a slot 26 is provided on each side of each fastening tongue 20 so that the fastening tongues receive the necessary elasticity that is needed to be able to latch the scale pot 10 into the recesses 21 of the housing 9.
  • the scale pot 10 shown has four of these fastening tongues 20, but it can also be more or less.
  • the scale pot 10 has in its interior the locking profile 19 (not shown here, see Figures 8 and 9).
  • FIG. 6 shows the adjustment button 6 with the spring element disk 7 placed on it.
  • the arrow 18 on the adjustment button 6 points in the direction of the first edge 24 of the recess 14.
  • FIG. 7 shows the disk 5 and the adjustment knob 6 attached in a partial sectional view along the line BB in FIG. 1.
  • the toothing 12 of the disk 5 engages in the internal toothing 13 of the adjustment button 6 and thus brings about the non-rotatable connection between the two.
  • the adjustment button 6 is placed so that the groove 15 coincides with the cam 16. Then the arrow 18 on the adjustment button 6 points precisely to the temperature marking on the scale pot 10 which corresponds to the calibration temperature.
  • FIG. 8 shows the adjustment button 6 with the scale pot 10 in the position that corresponds to the maximum possible setting temperature of the switching device 1.
  • This is the basic setting in which the temperature-controlled switching device 1 is delivered so that there is an irreversible setting option for lower switching temperatures over the entire setting range.
  • the arrow 18 on the adjustment button 6 points to a first setting mark 28.
  • a second setting mark 29 denotes the calibration temperature, while a third setting mark 30 denotes the minimum possible setting temperature.
  • the latching profile 19 is inside the scale pot 10.
  • the latching profile 19 is formed such that a single latching step lies between the setting markings 28 and 29 or between the setting markings 29 and 30 . It is of course readily possible to choose the number of setting marks and also the number of latching steps between the setting marks differently.
  • the locking profile 19 is shown in FIG. 9 in a partial section along the line CC in FIG. 8.
  • the spring element 8 is bent axially in the direction of arrow D 'and rests in the locking profile 19.
  • the adjustment button 6 is connected to the spring element disk 7 in a non-rotatable manner, they can only move in one direction relative to the scale pot 10, namely by turning the adjustment button 6 to the left, from grid to grid. This means that the adjustment can only be made in the direction of lower switching temperatures.
  • each rotational position of the adjusting screw 4 or the adjusting button 6 corresponds to a defined switching temperature.
  • the calibration is carried out at a certain temperature.
  • the arrow 18 on the adjustment button 6 points to the corresponding temperature marking on the (mounted) scale pot 10.
  • the switching point is set in the direction of a lower switching temperature by turning the adjustment button 6 to the left, for example with the aid of a screwdriver that fits into a slot 22 of the adjustment button .
  • the adjusting threaded bolt 4 Since the adjusting threaded bolt 4 is guided through the left-hand thread 11 and is supported on the temperature-dependent displacement sensor 2, the adjusting threaded bolt 4 and thus also the temperature-dependent displacement sensor 2, which in turn is supported with its lower part on a movable contact spring 3a of the electrical switch 3, downward.
  • the movable contact spring 3a When the lower part of the temperature-dependent displacement sensor 2 moves far enough towards the movable contact spring 3a - which is caused either by expansion of the temperature-dependent displacement sensor 2 as a result of increasing probe temperature or by the adjustment of the adjusting screw 8 described - the movable contact spring 3a switches with the assistance of a contact spring part 3b suddenly and opens the electrical connection between the movable contact spring 3a and a fixed contact spring 3c.
  • the switching point of the electrical switch 3 is reached earlier, that is, at a lower temperature, since a smaller thermal expansion (displacement) of the temperature-dependent displacement sensor 2 is now sufficient. to actuate the movable contact spring 3a of the electrical switch 3.
  • the construction and the Operation of the electrical switch 3 are known per se. Because of the locking profile 19 and the spring elements 8 engaging in the locking profile 19, a clockwise rotation of the adjusting knob 6 is completely prevented, so that the switching point can only be adjusted to lower temperatures.
  • Temperature-controlled switching devices 1 for heat generating systems preferably have an adjustment range from 95 ° C to 120 ° C. If temperature-controlled switching devices 1 are equipped with locking devices of this type, they must be delivered with the maximum temperature setting so that the entire temperature range is accessible. The temperature-controlled switching devices 1 can also be calibrated below the maximum temperature. This means that the setting to the maximum switching temperature is only made after calibration.
  • the calibration and the subsequent adjustment to the maximum switching temperature are carried out as follows:
  • the temperature-controlled switching device 1 is calibrated to a temperature below the maximum switching temperature, for example to 110 ° C.
  • the disc 5 is then in any position relative to the housing 9.
  • the adjusting button 6 with the spring element disc 7 is then placed on the disc 5 in the manner described earlier, in such a way that the groove 15 on the cams 16 on the housing 9 shows.
  • the arrow 18 on the adjustment button 6 then points in the direction of the second setting mark 29 on the scale pot 10 (which however, you cannot see it yet, since the scale pot 10 has not yet been put on).
  • the adjustment button 6 can be placed on the disc 5 in any position and because the adjustment characteristic of the temperature-dependent displacement sensor 2, ie the angle of rotation of the adjustment screw 4 depending on the switching temperature, is known. Thereupon, the adjusting knob 6 is turned to the right until it abuts the cam 16 with the first edge 24 of the recess 14. This is the setting to the maximum possible switching temperature, for example at 120 ° C, because the arrow 18 on the adjusting button 6 then points in the direction of the first setting mark 28 on the scale pot 10. Only then is the scale pot 10 placed and latched in, specifically so that the arrow 18 on the adjustment button points to the first setting mark 28. The scale pot 10 then only needs to be secured to the housing 9.
  • the latching device of the type shown has the advantage that it does not create any moments acting on the disk 5 or the adjusting screw 4, since the spring elements 8 can be deflected in the axial direction and therefore only act back on the adjusting button in the axial direction, and moreover from the same A complete compensation of the torques generated in the individual spring elements 8 results over the circumference of the arrangement. Axial forces are also not transmitted from the adjusting knob 6 to the washer 5 and the adjusting threaded bolt 4, since the adjusting knob 6 is supported on the housing 9 and is axially displaceable relative to the washer 5. Forces exerted on the adjusting screw 4 act temperature-controlled switching device 1, could significantly affect the switching point stability or the nominal value tolerance. This is avoided by the arrangement shown.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Control Of Temperature (AREA)

Claims (8)

  1. Mécanisme de commutation (1) à commande thermique possédant un capteur de déplacement (2) dépendant de la température et un commutateur électrique (3) commandé par ce dernier, un émetteur de valeur de consigne comprenant un boulon fileté de réglage (4) apte à se déplacer autour d'un axe (D) pour modifier la température de commutation du commutateur électrique (3) et un dispositif à encoches qui développe son activité entre le boulon fileté de réglage (4) et un boîtier (9) du mécanisme de commutation (1) à commande thermique pour régler de manière irréversible la valeur de consigne de l'émetteur de valeur de consigne, possédant un profil à encoches (19) et au moins un élément de ressort (8) venant s'insérer dans le profil à encoches (19), caractérisé en ce qu'un certain nombre d'éléments de ressort (8) aptes à effectuer une sortie en direction axiale sont disposés uniformément sur l'étendue d'un cercle entourant l'axe (D).
  2. Mécanisme de commutation (1) à commande thermique selon la revendication 1, caractérisé en ce que le ou lesdits éléments de ressort (8) sont reliés en antirotation avec le boulon fileté de réglage (4) apte à se déplacer autour de l'axe (D) et en ce que le profil à encoches (19) est relié en antirotation avec le mécanisme de commutation (1) à commande thermique.
  3. Mécanisme de commutation (1) à commande thermique selon la revendication 1 ou 2, caractérisé en ce que le ou lesdits éléments de ressort (8) sont reliés en antirotation avec une tête de réglage (6) bloquée en rotation par rapport au boulon fileté de réglage (4).
  4. Mécanisme de commutation (1) à commande thermique selon la revendication 3, caractérisé en ce que, sur le boulon fileté de réglage (4), est appliqué un élément de couplage bloqué en rotation par rapport à ce dernier et en ce que l'élément de couplage et la tête de réglage (6) peuvent être couplés l'un à l'autre en direction axiale à un endroit librement sélectionnable par enfichage de la tête de réglage (6) sur l'élément de couplage.
  5. Mécanisme de commutation (1) à commande thermique selon la revendication 4, caractérisé en ce que l'élément de couplage est réalisé en forme de disque (5).
  6. Mécanisme de commutation (1) à commande thermique selon la revendication 5, caractérisé en ce que le disque (5) présente, sur son bord, au moins partiellement, une denture (12) et en ce que la tête de réglage (6) présente, sur toute son étendue, une denture interne (13) correspondant à la denture (12).
  7. Mécanisme de commutation (1) à commande thermique selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les éléments de ressort (8) sont réalisés sous forme d'éléments en arcs de cercle cintrés en direction axiale.
  8. Mécanisme de commutation (1) à commande thermique selon la revendication 3, caractérisé en ce que la tête de réglage (6) s'appuie sur le boîtier (9) du mécanisme de commutation (1) à commande thermique.
EP19920117774 1992-10-17 1992-10-17 Dispositif de commutation à commande thermique Expired - Lifetime EP0593796B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59208407T DE59208407D1 (de) 1992-10-17 1992-10-17 Temperaturgesteuerte Schalteinrichtung
EP19920117774 EP0593796B1 (fr) 1992-10-17 1992-10-17 Dispositif de commutation à commande thermique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19920117774 EP0593796B1 (fr) 1992-10-17 1992-10-17 Dispositif de commutation à commande thermique

Publications (2)

Publication Number Publication Date
EP0593796A1 EP0593796A1 (fr) 1994-04-27
EP0593796B1 true EP0593796B1 (fr) 1997-04-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920117774 Expired - Lifetime EP0593796B1 (fr) 1992-10-17 1992-10-17 Dispositif de commutation à commande thermique

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EP (1) EP0593796B1 (fr)
DE (1) DE59208407D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19604949C2 (de) * 1996-02-10 1998-12-24 Thermostat & Schaltgeraetebau Thermische Schalteinrichtung
IT1404222B1 (it) * 2011-01-24 2013-11-15 Bitron Spa Dispositivo interruttore

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR351719A (fr) * 1905-02-24 1905-07-24 A Granoux & Cie Soc Nouvel interrupteur de courant électrique
CH634170A5 (en) * 1978-10-13 1983-01-14 Landis & Gyr Ag Temperature-controlled switching device having the capability to change its setting and function in a variable manner, independently of one another
DE3504135A1 (de) * 1985-02-07 1986-08-07 Emerson Electric Gmbh, 7050 Waiblingen Temperaturregler fuer elektrische geraete, insbesondere wasch- und geschirrspuelmaschinen

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Publication number Publication date
DE59208407D1 (de) 1997-05-28
EP0593796A1 (fr) 1994-04-27

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