EP0005191B1 - Temperaturregler mit einem Schnappschalter und einem Ausdehnungsglied - Google Patents

Temperaturregler mit einem Schnappschalter und einem Ausdehnungsglied Download PDF

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Publication number
EP0005191B1
EP0005191B1 EP79101100A EP79101100A EP0005191B1 EP 0005191 B1 EP0005191 B1 EP 0005191B1 EP 79101100 A EP79101100 A EP 79101100A EP 79101100 A EP79101100 A EP 79101100A EP 0005191 B1 EP0005191 B1 EP 0005191B1
Authority
EP
European Patent Office
Prior art keywords
spring
snap spring
snap
thermostat according
expansion
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
EP79101100A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0005191A1 (de
Inventor
Robert Kicherer
Manfred Schwarze
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.)
Cessione ego Elektrogeraete AG
Original Assignee
EGO Regeltechnik 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 EGO Regeltechnik GmbH filed Critical EGO Regeltechnik GmbH
Publication of EP0005191A1 publication Critical patent/EP0005191A1/de
Application granted granted Critical
Publication of EP0005191B1 publication Critical patent/EP0005191B1/de
Expired 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
    • H01H37/04—Bases; Housings; Mountings

Definitions

  • the invention relates to a temperature controller with a snap switch containing a snap spring, on which an expansion element of a thermal expansion system and an adjusting element act, the snap switch containing a contact bridge which is arranged on the snap spring but is electrically insulated therefrom and which is connected to the contacts formed as fixed contacts. and output contacts cooperates.
  • a temperature controller according to the preamble of claim 1 has become known, which features a snap switch mechanism consisting of several pivotably mounted plates and levers and has a double contact bridge, which enables switching off even if one of the contact bridges e.g. does not open by welding the contacts.
  • the construction of this controller is very complicated and is made up of several levers and springs.
  • the actuation system consists of an expansion box that is mechanically connected in series with the setting element. As a result, the expansion box must always move with the setting element and therefore requires a movable bearing which can cause inaccurate switching.
  • the action on the switches by the combined actuation system is also indirect and thus does not allow the production of a very precise controller that enables precisely reproducible switching.
  • the object of the invention is to provide a temperature controller with a simple and robust structure, which enables a very precise and reproducible temperature control under all switching conditions.
  • bearings of the snap spring are provided on a leaf spring-like, one-sidedly fixed to the housing, resiliently movable snap spring carrier which runs approximately parallel to the snap spring, is supported on the adjusting member and is movable by it, and that Expansion member presses directly on the actuation pressure point of the snap spring lying between the bearings of the snap spring.
  • the snap spring carrier is thus brought into the desired position by the setting member against which it is resiliently pressed and normally remains in this position during the entire control process.
  • the expansion member on the other hand, only presses against the snap spring, namely between the two cutting edge bearings, so that it only shifts them almost parallel by minimal amounts, so that no transverse movements occur.
  • the expansion socket with its capillary tube can be fixed to the housing.
  • the switch structure is not only particularly simple and, apart from the connection block and an insulating piece on the snap spring, can only consist of sheet metal parts, but also leads to a compact design that makes it possible to have a full-fledged temperature controller with a width and height of its switch body of less than 20 mm.
  • the temperature controller can additionally have a switch-off switch which can be actuated by the expansion member when it is extremely contracted as a result of damage in the expansion system and which is designed to engage the end of the snap spring carrying the contact bridge.
  • a switch of a different type such a device has already been proposed in US Pat. No. 3,924,142.
  • the switch-off device is a double-armed lever which is supported with one arm under spring force on the expansion member and carries on the other arm a preferably adjustable engagement part which can be brought into engagement with an insulating piece carrying the contact bridge.
  • a device is created which is relatively rigid and acts directly on the insulating piece which is actually to be prevented from switching.
  • the temperature controller 11 shown in Figures 1 to 3 has a snap switch 12 with a snap spring 13 and is designed as a single-pole on / off switch. However, it is also possible to use a multi-pole temperature controller gene switch or a switch.
  • the snap spring 13 consists of a strip-shaped base spring part 14 made of thin spring material, from which a spring tongue 15 is cut out by a U-shaped incision. Their free end and one end of the base spring part are supported in cutting edge bearings 16, 17 which are provided on a lever 18 arranged essentially parallel to the snap spring.
  • the cutting edge bearing 17 at the end of the base spring part extends through a slot 19 in it, so that the cutting edges point in the opposite direction and thus hold the base spring part.
  • An actuation pressure point 20 in the form of an expression of the base spring part is provided between the two cutting edge bearings 16, 17.
  • an insulating piece 21 is riveted, which has on its underside a contact bridge 22 which is fixed by a T-shaped rivet 23 with a slight play on the insulating piece 21. It extends transversely to the extension of the snap spring and is insulated from it.
  • the contact bridge 22 works with two fixed contacts 25 arranged side by side in an insulating body 24 and bridges them only when the snap spring is in its (lower) switched-on position.
  • connection contact parts 26 are each attached to one end of connection contact parts 26, each of which is formed from a sheet metal strip which projects through slots in the rectangular insulating body and forms a tab for electrical connection at its end protruding from the insulating body and the temperature controller.
  • the insulating body 24 is clamped between two side parts 27, 28 made of sheet metal parts by means of a screw 29.
  • the side part 27 has the shape of an essentially flat sheet metal strip which has bevels 30 in the edge region and on which the L-shaped fastening tab 31 is cut out and bent, which carries a fastening thread 32 in a grommet drawn from the sheet metal.
  • a thread 33 is arranged, into which an adjusting screw 34 is screwed, which is connected to the rivet 23 to determine the contact distance, i.e. the possibility of movement of the snap switch cooperates when switching.
  • an adjustment thread 35 is provided, into which an adjustment shaft 36, once designed in its lower region as a screw spindle, is screwed.
  • This hollow setting shaft has a flattened portion in the part protruding vertically from the temperature controller to prevent rotation of a setting button.
  • a stop part 37 is fixed, which interacts with a stop in the form of a bent-out sheet metal tab 38 on the side part 27.
  • the adjusting shaft 36 also has an internal thread into which an adjusting screw 39 is screwed for temperature adjustment.
  • the end of the adjusting screw 39 presses on the lever 18 in its free area, which supports the support bearings 16, 17.
  • This lever is clamped between the side part 27 and the insulating body 24 by means of the screw 29 and is resiliently elastic in its end adjoining the clamping, while it is stiffened in the rest of the region by an edge fold.
  • the lever 18 is pressed in the manner of a leaf spring in the direction of the adjusting screw 39 and is pivoted by the latter during its movement and in particular during the movement of the adjusting shaft 36.
  • the position of the snap spring in the region of its support bearing and its actuation point 20 is changed in accordance with the temperature adjustment and setting.
  • the operating side of the temperature controller 11 is covered by the side part 27.
  • the opposite side is covered by the side part 28, which is also designed in the form of a sheet metal plate stiffened by edge folds, but which is bent in an L-shape at its end opposite the connection or insulating body 24 and thus covers the end face opposite the connection side.
  • This L-leg 40 is connected at its free end to the side part 27 by twisted metal tabs 41 which are inserted through slots in the side part.
  • the side part 28 has an inwardly bowl-shaped shape 42 with a central bore, through which a connecting part 43 of a hydraulic expansion socket 44 projects and is fixed thereon by means of a spring-loaded ring 49 pushed over it.
  • the expansion box 44 consists, in a known manner, of two cup-shaped sheet metal shells, one inside the other and welded tightly to one another in the edge area, which cause expansion in the central area due to their elasticity supported by corrugations.
  • the connection part 43 On the inside of its cup-shaped shape, the connection part 43 is attached, which in turn is fixed on the side part 28, while on the opposite side a pressure piece 45 is fastened by means of spot welding.
  • a capillary tube 46 which connects the expansion socket with a sensor shown schematically, projects into the connecting piece 43 and is soldered there.
  • the capillary tube runs along the outside of the side part 28 and is fastened to the L-leg 40 for strain relief by means of a shaped sheet metal tab 47.
  • the housing or frame carrying the individual parts of the temperature controller is small and compact and consists predominantly of simple sheet metal stampings. There are only two simply designed, made of a ceramic material like Insulated parts made of steatite available.
  • the controller is reliable and easy to adjust.
  • the snap spring, on the actuation pressure point 20 of the pressure piece 45, is not at risk of overpressure because it is suspended in two cutting edge bearings.
  • the two long sides, which extend between the side parts 27 and 28, that is to say the sides lying in front of and behind the plane of the drawing in FIG. 1 but parallel to this, can be covered by plates 50 made of a thin insulating material, which are separated from the edges of the edges Side parts 27, 28 are held.
  • the snap spring Due to the advantageous design of the snap spring, it can be built with very little hysteresis, so that temperature differences of a few degrees and the resulting actuation paths at the pressure point 20 in the order of magnitude of hundredths of a millimeter are sufficient to cause switching on and off.
  • a preferably short and strong bimetal possibly in a bridge construction with two supported ends and a central power take-off
  • the controller is to be arranged directly in the area to be sensed.
  • a cam disc mounted on a side part could also be provided if, for example, a non-linear setting characteristic is desired.
  • the screw spindle makes it possible to place the middle pressure piece of the expansion socket, the actuation point and the point of application of the screw spindle practically on one axis, without the need for translations. In the case of an adjustment curve, a translation could be carried out by appropriate arrangement or extension of the lever 18.
  • An embodiment is particularly advantageous in which the insulating piece 21 carrying the contact bridge 22 is made of creep-current-resistant plastic with which the snap spring is extrusion-coated at its end. It has a low weight so that the snap spring can switch faster due to low inertial forces.
  • FIG. 4 shows a temperature controller which, apart from the deviations mentioned below, corresponds to that according to FIGS. 1 to 3.
  • the same parts have the same reference numerals.
  • the expansion box 44 has a pressure piece 45 'with a collar on which a fork-shaped arm 51 of a double-armed lever about an axis 54 of a switch-off device is supported under the force acting on the other arm 55 of the lever spring 56.
  • an engagement part 57 in the form of a leaf spring is attached, which can be spread out by means of an adjusting screw 58 from the arm 55 of the lever.
  • the insulating piece 21 'carrying the contact bridge 22 is made of creep-current-resistant plastic with which the snap spring 13 is extrusion-coated at its free end. It has a lower weight so that the snap spring can switch faster due to lower inertia forces.
  • the switch-off device 53 is arranged in such a way that the engagement part 57 engages on the insulating piece 21 'and, despite the snap spring loaded in the switching-on direction, can keep the contacts open if the expansion socket contracts extremely widely as a result of a leak in the expansion system (hydraulic sensor, capillary tube or expansion socket), as in Fig. Is shown. The switch is therefore protected against damage to the expansion system (intrinsically safe).
  • the switch-off device 53 represents a device which is independent of the snap spring and is actuated directly by the expansion socket and which forms a stop for keeping the contacts open.
  • the insulating piece 53 or the stop part attached to it is opposite a counter stop 60, but at such a large distance that the snap spring, when it springs into its off position by expanding the expansion box 44, rests against the counter stop 60 and by contracting the Expansion socket is not to be brought back into its switch-on position.
  • the snap spring then jumped out of its snap area.
  • the counter-stop 60 is moved towards the snap spring for reclosing.
  • the counter-stop projecting through a hole in the snap spring support 18 and the side part 27 is mushroom-shaped and projects with its shaft out of the temperature controller.
  • a one-armed spring lever 61 fastened in the region of the insulating body 24 can be used with its Press the central region onto the shaft of the counter-stop 60 when its free end, which extends around the adjusting shaft in a forked manner, is pressed down by the collar 62 of an adjusting button 63, which can be moved axially against the force of a spring 64 axially on the adjusting shaft.
  • 4 is not only intrinsically safe, but also provided with a limiter function that prevents automatic restart. However, the limiter temperature is adjustable.
  • the intrinsic safety feature and the dial limiter function can also be used independently.
  • the spring lever 61 can also be omitted, the restart being carried out by pressing the shaft of the counter-stop 60.
  • the housing must then be opened, for example, which may be desirable in order to ensure that an error is rectified which has led to the overtemperature displayed.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Greenhouses (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP79101100A 1978-04-13 1979-04-10 Temperaturregler mit einem Schnappschalter und einem Ausdehnungsglied Expired EP0005191B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2815987 1978-04-13
DE2815987A DE2815987C2 (de) 1978-04-13 1978-04-13 Temperaturregler

Publications (2)

Publication Number Publication Date
EP0005191A1 EP0005191A1 (de) 1979-11-14
EP0005191B1 true EP0005191B1 (de) 1982-05-05

Family

ID=6036872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79101100A Expired EP0005191B1 (de) 1978-04-13 1979-04-10 Temperaturregler mit einem Schnappschalter und einem Ausdehnungsglied

Country Status (14)

Country Link
US (1) US4260977A (pt)
EP (1) EP0005191B1 (pt)
JP (1) JPS5510791A (pt)
AT (1) AT376060B (pt)
AU (1) AU523467B2 (pt)
BR (1) BR7902256A (pt)
DE (1) DE2815987C2 (pt)
ES (1) ES479494A1 (pt)
GR (1) GR64829B (pt)
HK (1) HK43184A (pt)
NO (1) NO153385C (pt)
PL (1) PL214783A1 (pt)
YU (1) YU42179B (pt)
ZA (1) ZA791579B (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19706248A1 (de) * 1997-02-18 1998-08-20 Ego Elektro Geraetebau Gmbh Elektrisches Leistungssteuergerät, insbesondere für Elektrowärmegeräte

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
IT209816Z2 (it) * 1987-01-09 1988-11-04 Prodigy Italiana Srl Termostato per il controllo del funzionamento di apparecchiature in genere.
EP0425752B1 (en) * 1989-11-03 1994-06-08 C.A.E.M. S.R.L. An electric adjustable thermostat with temperature compensation
JPH04194392A (ja) * 1990-11-27 1992-07-14 Mitsubishi Heavy Ind Ltd コントロールバルブの取付構造
EP0647956B1 (de) * 1993-10-12 1995-06-28 ETHECO European Thermostat Company Temperaturgesteuerte Schalteinrichtung mit einem Kippsystem
DE19704575C1 (de) * 1997-02-07 1998-08-06 Emerson Electric Gmbh Schaltgerät
DE19824871A1 (de) * 1998-06-04 1999-12-09 Ego Elektro Geraetebau Gmbh Temperaturschalter, insbesondere einstellbarer Temperaturregler
US7479868B2 (en) * 2005-06-08 2009-01-20 Therm-O-Disc, Incorporated Trip-free manual reset thermostat
DE102017223290A1 (de) 2017-12-19 2019-06-19 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Verändern eines Arbeitsfluids in einem Ausdehnungssystem und Ausdehnungssystem
DE102018203099A1 (de) * 2018-03-01 2019-09-05 E.G.O. Elektro-Gerätebau GmbH Temperaturgesteuerte Vorrichtung zum Abschalten einer Heizeinrichtung
DE102018203097A1 (de) * 2018-03-01 2019-09-05 E.G.O. Elektro-Gerätebau GmbH Temperaturgesteuerte Vorrichtung zum Abschalten einer Heizeinrichtung
DE102021200991B4 (de) 2021-02-03 2022-05-19 E.G.O. Elektro-Gerätebau GmbH Ausdehnungssystem mit einem Arbeitsfluid

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US2180018A (en) * 1936-05-14 1939-11-14 Automatic Control Corp Diaphragm-actuated transmission means
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19706248A1 (de) * 1997-02-18 1998-08-20 Ego Elektro Geraetebau Gmbh Elektrisches Leistungssteuergerät, insbesondere für Elektrowärmegeräte

Also Published As

Publication number Publication date
US4260977A (en) 1981-04-07
NO153385C (no) 1986-03-05
PL214783A1 (pt) 1980-01-02
NO791231L (no) 1979-10-16
JPS6245656B2 (pt) 1987-09-28
GR64829B (en) 1980-06-03
DE2815987C2 (de) 1986-02-06
AT376060B (de) 1984-10-10
BR7902256A (pt) 1979-12-11
HK43184A (en) 1984-05-25
YU87179A (en) 1983-01-21
ZA791579B (en) 1980-04-30
AU523467B2 (en) 1982-07-29
DE2815987A1 (de) 1979-10-18
AU4585179A (en) 1979-10-18
YU42179B (en) 1988-06-30
ATA239979A (de) 1984-02-15
EP0005191A1 (de) 1979-11-14
NO153385B (no) 1985-11-25
ES479494A1 (es) 1980-01-01
JPS5510791A (en) 1980-01-25

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