EP0282974A2 - Temperature sensitive actuating element for switch - Google Patents

Temperature sensitive actuating element for switch Download PDF

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Publication number
EP0282974A2
EP0282974A2 EP88104110A EP88104110A EP0282974A2 EP 0282974 A2 EP0282974 A2 EP 0282974A2 EP 88104110 A EP88104110 A EP 88104110A EP 88104110 A EP88104110 A EP 88104110A EP 0282974 A2 EP0282974 A2 EP 0282974A2
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EP
European Patent Office
Prior art keywords
actuating element
temperature
capillary tube
plastic
membrane
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.)
Withdrawn
Application number
EP88104110A
Other languages
German (de)
French (fr)
Other versions
EP0282974A3 (en
Inventor
Bernd Recke
Horst Weber
Ullrich Ehme
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.)
VEB ELEKTROGERAETE POSERNA
Original Assignee
Veb Elektrogerate Poserna
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Publication date
Application filed by Veb Elektrogerate Poserna filed Critical Veb Elektrogerate Poserna
Publication of EP0282974A2 publication Critical patent/EP0282974A2/en
Publication of EP0282974A3 publication Critical patent/EP0282974A3/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/36—Thermally-sensitive members actuated due to expansion or contraction of a fluid with or without vaporisation
    • 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
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm

Definitions

  • the one side of the pressure chamber serving as a membrane which is designed as a capsule, is made of precipitation-hardened, stainless steel or precipitation-hardened beryllium copper or phosphate bronze as an elastic disk.
  • Such pressure chamber systems of the aforementioned type require considerable technological effort since the intended effects can only be guaranteed by a complicated adjustment due to the thermal stress on the membrane caused by the ring-shaped soldering or welding.

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

Abstract

The invention relates to a temperature sensitive actuating element for switches used for temperature control, monitoring and limiting in domestic electrical apparatuses and other apparatuses with electrical heating elements, in which the overall system of the individual elements, consisting of an insertion opening (2) for the capillary tube (7), a slot (5), trough-like depressions (3) and a plastic or plastic film membrane (6) is an integral component of a plastic injection part (1) which itself is used as a grip or housing part, as a result of which the installed height of the actuating element is significantly reduced and more economical production is ensured with a low wastage rate. <IMAGE>

Description



Die Erfindung betrifft ein temperaturabhängiges Betä­tigungselement für Schalter zur Temperaturregelung, -überwachung und -begrenzung bei elektrischen Haushalts­geräten sowie anderen Geräten mit elektrischen Heiz­elementen.The invention relates to a temperature-dependent actuating element for switches for temperature control, monitoring and limitation in electrical household appliances and other devices with electrical heating elements.

Bekannt sind eine Vielzahl temperaturabhängiger Betä­tigungselemente zur Betätigung eines Schalters, insbeson­dere Schnappschalters, die sich dadurch auszeichnen, daß eine Meßdose über ein Kapillarrohr mit einer Druckkammer fest verbunden ist (DE-OS 1 964 723). Weiterhin ist aus der US-PS 3 135 849 eine Vorrichtung bekannt, bei der eine Membrandose mit einem mit Ausdehnungsflüssigkeit gefüllten Fühlerrohr verbunden ist. Bei dieser bekannten Vorrich­tung weist das Ausdehnungsgefäß eine seitlich hochgezogene Wand auf. Mit einer derartig hochgezogenen Wand ist auch die Membran ausgebildet. Diese hochgezogenen Wände müssen unter Verwendung eines besonderen Werkzeuges mittels Dicht­schweißung verbunden werden. Auch können bei den in der Nähe des Kapillarrohres ausgeführten Lötverbindungen die Rohrenden durch Lot leicht verstopft werden. Ein weiterer Nachteil besteht darin, daß die Bauhöhe der Membran zu groß ist.
Aus der DE-PS 2 608 675 ist eine Vorrichtung bekannt, in der die Ausdehnungsmembran aus zwei parallel zueinander­liegenden Scheiben gebildet wird, die konzentrisch gewölbt sind und somit eine Minimierung der Bauhöhe ermöglichen. Das dichte Schließen des zu bildenden Hohlraumes wird hier z.B durch Widerstandsschweißen erreicht. Das Kapil­larrohr wird mit Weichlot gelötet, was eine Verstopfung weitestgehend ausschließt.
Bekannt ist weiterhin (DE-OS 2 532 231), daß das Druck­system und der Schalter auf einem als Baueinheit in das Gehause einsetzbaren Träger angeordnet sind.
Aus DE-OS 3 226 251 ist auch bekannt, daß die als Membran dienende eine Seite der Druckkammer, die als Kapsel aus­gebildet ist, als elastische Scheibe aus ausscheidungsge­härtetem, rostfreiem Stahl oder ausscheidungsgehärtetem Berylliumkupfer oder Phosphatbronze besteht.
Solche Druckkammersysteme der vorgenannten Art erfordern einen erheblichen technologischen Aufwand, da durch die thermische Belastung der Membran, hervorgerufen durch das ringförmige Löten oder Schweißen die vorgesehenen Effekte nur durch eine komplizierte Justierung gewährleistet wer­den können.A large number of temperature-dependent actuating elements for actuating a switch, in particular snap switches, are known, which are characterized in that a load cell is firmly connected to a pressure chamber via a capillary tube (DE-OS 1 964 723). Furthermore, a device is known from US Pat. No. 3,135,849 in which a membrane box is connected to a sensor tube filled with expansion fluid. In this known device, the expansion vessel has a laterally raised wall. The membrane is also formed with such a raised wall. These raised walls must be connected using a special tool by means of seal welding. Also, with the solder connections made in the vicinity of the capillary tube, the tube ends can be easily blocked by solder. Another disadvantage is that the height of the membrane is too large.
From DE-PS 2 608 675 a device is known in which the expansion membrane is formed from two disks lying parallel to one another, which are arched concentrically and thus enable the overall height to be minimized. The tight closing of the cavity to be formed is achieved here, for example, by resistance welding. The capillary tube is soldered with soft solder, which largely prevents clogging.
It is also known (DE-OS 2 532 231) that the printing system and the switch are arranged on a carrier which can be used as a structural unit in the housing.
From DE-OS 3 226 251 it is also known that the one side of the pressure chamber serving as a membrane, which is designed as a capsule, is made of precipitation-hardened, stainless steel or precipitation-hardened beryllium copper or phosphate bronze as an elastic disk.
Such pressure chamber systems of the aforementioned type require considerable technological effort since the intended effects can only be guaranteed by a complicated adjustment due to the thermal stress on the membrane caused by the ring-shaped soldering or welding.

Der Erfindung liegt die Aufgabe zugrunde, ein universell einsetzbares, temperaturabhängiges Betätigungselement mit geringer Bauhöhe für Schalter zu entwickeln, das sich ge­genüber bekannten Ausführungsformen durch eine geringere Ausschußquote, reduzierte Material- und Montagekosten aus­zeichnet und insgesamt mit einem veringerten technolo­gischen Aufwand rationeller herstellbar ist.
Die Aufgabe wurde erfindungsgemäß dadurch gelöst, daß ein Plastspritzteil mit einer Einführungsöffnung für das Ka­pillarrohr, weiterhin im Verhältnis zur Ausdehungsmembran mit einer konvexen, muldenartigen Ausprägung sowie einer konvexen, nutartigen Ausprägung, deren innerer Querschnitt dem des Kapillarrohres adäquat ist, versehen ist. Die im Plastspritzteil angeordneten Vertiefungen sowie die Ein­führungsöffnung für das Kapillarrohr werden durch eine runde Plast- oder Plastfolienmembran dicht verschweißt, wobei die Auflagefläche so gestaltet ist, daß nur die Randflächen der Membran aufliegen und durch Hochfrequenz- oder Ultraschallschweißung miteinander dicht verbunden werden. Dadurch wird erreicht, daß sich sowohl die Bau­höhe wesentlich verringert als auch durch die Integra­tion des gesamten Systems in einem Plastspritzteil, wel­ches selbst als Griff- oder Gehäuseteil verwendet wird, keine zusätzlichen Plastspritzteile bzw. andere selbstän­dige Elemente benötigt werden.The invention has for its object to develop a universally applicable, temperature-dependent actuating element with a low overall height for switches, which is distinguished from known embodiments by a lower reject rate, reduced material and assembly costs and can be produced more rationally with a reduced technological effort.
The object was achieved in that a plastic injection molded part with an insertion opening for the capillary tube, in relation to the expansion membrane with a convex, trough-like shape and a convex, groove-like shape, the internal cross section of which is adequate to that of the capillary tube. The depressions arranged in the plastic injection molded part and the insertion opening for the capillary tube are sealed by a round plastic or plastic film membrane, the bearing surface being designed such that only the edge surfaces of the membrane rest and are tightly connected to one another by high-frequency or ultrasonic welding. It is thereby achieved that both the overall height is significantly reduced and no additional plastic injection parts or other independent elements are required due to the integration of the entire system in a plastic injection molded part, which is itself used as a handle or housing part.

In der Zeichnung ist ein Ausführungsbeispiel eines tempe­raturabhängigen Betätigungselementes für Schalter gemäß der Erfindung schematisch dargestellt.
Die Zeichnung zeigt ein als Griffteil ausgebildetes Plast­spritzteil 1, in dem die Einführungsöffnung 2 für das Ka­pillarrohr 7 und die muldenartige Vertiefung 3 sowie die diese verbindende Nut 5 angeordnet sind. Die Einführungs­öffnung 2, die Nut 5 und die muldenartige Vertiefung 3 sind innerhalb des Griffteiles 1 in einer Ebene angeordnet und werden durch eine Plastfolienmembran 6, die auf der Auflagefläche 4 im Griffteil nur mit den Randflächen 8 aufliegt, ringförmig dicht verschweißt.In the drawing, an embodiment of a temperature-dependent actuating element for switches according to the invention is shown schematically.
The drawing shows a plastic molded part 1 designed as a grip part, in which the insertion opening 2 for the capillary tube 7 and the trough-like recess 3 and the groove 5 connecting them are arranged. The insertion opening 2, the groove 5 and the trough-like recess 3 are arranged in one plane within the handle part 1 and are welded in an annular tight manner by a plastic film membrane 6, which rests on the support surface 4 in the handle part only with the edge surfaces 8.

Claims (4)

1. Temperaturabhängiges Betätigungselement für Schalter zur Temperaturregelung, -überwachung und -begrenzung, dadurch gekennzeichnet, daß die gesamten Elemente, be­stehend aus einer Einführungsöffnung (2) für das Ka­pillarrohr (7), einer im Verhältnis zur Ausdehnungs­membran konvexen, muldenartigen sowie einer konvexen, nutartigen Vertiefung, in einem Plastspritzteil (1) integriert, wobei die Nut (5) die Einführungsöffnung (2) für das Kapillarrohr (7) mit der muldenartigen Ver­tiefung (3) verbindet und mit einer Plast- oder Fo­lienmembran (6) dicht verschweißt sind.1. Temperature-dependent actuating element for switches for temperature control, monitoring and limitation, characterized in that the entire elements, consisting of an insertion opening (2) for the capillary tube (7), a convex, trough-like and a convex, groove-like in relation to the expansion membrane Recess, integrated in a plastic injection-molded part (1), the groove (5) connecting the insertion opening (2) for the capillary tube (7) with the trough-like depression (3) and being tightly welded to a plastic or film membrane (6). 2. Temperaturabhängiges Betätigungselement für Schalter nach Anspruch 1, dadurch gekennzeichnet, daß der Quer­schnitt der Nut (5) dem des Kapillarrohres (7) adäquat ist.2. Temperature-dependent actuating element for switches according to claim 1, characterized in that the cross section of the groove (5) is that of the capillary tube (7) adequate. 3. Temperaturabhängiges Betätigungselement für Schalter nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Auflagefläche (4) im Plastspritzteil (1) so gestaltet ist, daß nur die Randflächen (8) der Membran (6) auf­liegen und ringförmig dicht verschweißt sind.3. Temperature-dependent actuating element for switches according to claim 1 and 2, characterized in that the bearing surface (4) in the plastic injection part (1) is designed such that only the edge surfaces (8) of the membrane (6) rest and are welded in an annular seal. 4. Temperaturabhängiges Betätigungselement für Schalter nach den Ansprüchen 1 - 3, dadurch gekennzeichnet, daß das Plastspritzteil (1) als Griff- oder Gehäuseteil ausgebildet ist.4. Temperature-dependent actuating element for switches according to claims 1-3, characterized in that the plastic injection molded part (1) is designed as a handle or housing part.
EP88104110A 1987-03-16 1988-03-15 Temperature sensitive actuating element for switch Withdrawn EP0282974A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD300820 1987-03-16
DD30082087 1987-03-16

Publications (2)

Publication Number Publication Date
EP0282974A2 true EP0282974A2 (en) 1988-09-21
EP0282974A3 EP0282974A3 (en) 1990-07-11

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EP88104110A Withdrawn EP0282974A3 (en) 1987-03-16 1988-03-15 Temperature sensitive actuating element for switch

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0529419A2 (en) * 1991-08-22 1993-03-03 E.G.O. Elektro-Geräte Blanc und Fischer GmbH &amp; Co. KG Capillary tube conduction system as well as the manufacture and device for manufacturing a capillary tube conduction system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1149780B (en) * 1961-08-10 1963-06-06 Funke Huster Elektrizitaets From a print medium, e.g. B. pressurized water, controllable electrical switch
US3135849A (en) * 1962-02-28 1964-06-02 Cutler Hammer Inc Thermostatic control switches for refrigerators and the like
DE1939186U (en) * 1966-02-15 1966-05-26 Patinvest Patent Und Invest A SNAP SWITCHES, IN PARTICULAR FOR WASHING MACHINES OD. DGL.
DE1964723A1 (en) * 1969-12-23 1971-07-01 Karl Fischer Expansion box and method of making it
FR2343235A1 (en) * 1976-03-03 1977-09-30 Inter Control Koehler Hermann DEFORMABLE MEMBRANE TEMPERATURE PROBE
EP0089525A1 (en) * 1982-03-08 1983-09-28 The Singer Company Pressure switch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1149780B (en) * 1961-08-10 1963-06-06 Funke Huster Elektrizitaets From a print medium, e.g. B. pressurized water, controllable electrical switch
US3135849A (en) * 1962-02-28 1964-06-02 Cutler Hammer Inc Thermostatic control switches for refrigerators and the like
DE1939186U (en) * 1966-02-15 1966-05-26 Patinvest Patent Und Invest A SNAP SWITCHES, IN PARTICULAR FOR WASHING MACHINES OD. DGL.
DE1964723A1 (en) * 1969-12-23 1971-07-01 Karl Fischer Expansion box and method of making it
FR2343235A1 (en) * 1976-03-03 1977-09-30 Inter Control Koehler Hermann DEFORMABLE MEMBRANE TEMPERATURE PROBE
EP0089525A1 (en) * 1982-03-08 1983-09-28 The Singer Company Pressure switch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0529419A2 (en) * 1991-08-22 1993-03-03 E.G.O. Elektro-Geräte Blanc und Fischer GmbH &amp; Co. KG Capillary tube conduction system as well as the manufacture and device for manufacturing a capillary tube conduction system
EP0529419A3 (en) * 1991-08-22 1993-06-16 E.G.O. Elektro-Geraete Blanc U. Fischer Capillary tube conduction system as well as the manufacture and device for manufacturing a capillary tube conduction system
US5358288A (en) * 1991-08-22 1994-10-25 E.G.O. Elektro-Gerate Blanc U. Fischer Capillary duct system and process and apparatus for producing a capillary duct system
TR26449A (en) * 1991-08-22 1995-03-15 Ego Elektro Blanc & Fischer KILCAL PIPE-TRANSMISSION SYSTEM AND KILCAL PIPE-TRANSMISSION SYSTEM METHOD AND EQUIPMENT
AU662158B2 (en) * 1991-08-22 1995-08-24 E.G.O. Elektro-Geratebau Gmbh Capillary duct system and process and apparatus for producing a capillary duct system

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EP0282974A3 (en) 1990-07-11

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