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EP0624891B1 - Dispositif commutateur pour anode réactive - Google Patents

Dispositif commutateur pour anode réactive Download PDF

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Publication number
EP0624891B1
EP0624891B1 EP94107212A EP94107212A EP0624891B1 EP 0624891 B1 EP0624891 B1 EP 0624891B1 EP 94107212 A EP94107212 A EP 94107212A EP 94107212 A EP94107212 A EP 94107212A EP 0624891 B1 EP0624891 B1 EP 0624891B1
Authority
EP
European Patent Office
Prior art keywords
membrane
sealing body
contact
fact
sacrificial anode
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
EP94107212A
Other languages
German (de)
English (en)
Other versions
EP0624891A3 (fr
EP0624891A2 (fr
Inventor
Lutz Seyfarth
Karl-Christian Blumenthal
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.)
Stiebel Eltron GmbH and Co KG
Original Assignee
Stiebel Eltron GmbH and Co KG
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 Stiebel Eltron GmbH and Co KG filed Critical Stiebel Eltron GmbH and Co KG
Publication of EP0624891A2 publication Critical patent/EP0624891A2/fr
Publication of EP0624891A3 publication Critical patent/EP0624891A3/fr
Application granted granted Critical
Publication of EP0624891B1 publication Critical patent/EP0624891B1/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
    • 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 invention relates to an electrical switching device for displaying the consumption of a sacrificial anode in a water heater, wherein a membrane is arranged in a measuring space connected to an interior of the sacrificial anode, which seals the measuring space from a contact chamber in which switching contacts located in a display circuit are arranged are connectable by means of a contact body movable with the membrane in a switching stroke.
  • Such a switching device is described in DE-GM 79 32 910.
  • the sacrificial anode used to protect the water tank from corrosion in the water heater can be used up. Water can then enter the interior of the sacrificial anode, causing the membrane to bend under the action of the water pressure. This triggers a display signal that is an indication of the consumption of the sacrificial anode.
  • Such a display can only be expected after a long time, for example after a few years of operation of the water heater. It cannot be ruled out with certainty that the membrane has become leaky after such a long time, for example due to embrittlement. If this is done, then water can get into the contact chamber in the switching device according to DE-GM 79 32 910. On the one hand, this makes the membrane jumping around unsafe and, on the other hand, arises via the water an electrical connection between one of the live switch contacts and the water tank. The possibility of such a state does not meet safety requirements and can endanger the user. Otherwise, the water tank may also corrode in such a case if the water heater continues to operate due to the lack of a display signal.
  • a simple contact bridge is provided as the contact body, which in the case of a display contacts the switch contacts. Such contacting appears in particular to be unreliable because, over time, oxide layers can form on the switching contacts and / or the contact body, which impair the necessary electrical contacting in an emergency.
  • a two-point support of the contact bridge is provided on the switch contacts. If the contact bridge is displaced or tilted, contact may become unsafe.
  • the object of the invention is to propose an electrical switching device of the type mentioned, the function of which is ensured even after a long time.
  • the above object is achieved in a switching device of the type mentioned at the outset in that a sealing body is seated on the movable section of the membrane and carries the contact body, the Sealing body seals the contact chamber against the membrane.
  • the sealing body still seals the contact chamber from the measuring chamber when the sacrificial anode is consumed. So even with a leaky membrane, no water can get into the contact chamber, so that no undesired electrical short circuits can occur there.
  • the membrane of the sacrificial anode is so far leaky that it no longer jumps under the water pressure that then occurs, then the further sealing body is displaced by the water pressure in such a way that it moves the contact body against the switching contacts, as a result of which the desired consumption is displayed.
  • the further sealing body can be stuck to the membrane.
  • the sealing body sits loosely on the membrane, so that when the membrane is so far leaky that it no longer bounces under the water pressure, it is rather moved under the water pressure and thereby moves the contact body to the switching contacts without the membrane having to take it with them.
  • the further sealing body can consist of a pressure plate and at least one sealing sleeve arranged on it or at least one sealing ring arranged on it.
  • the sealing body forms the pressure plate and the sealing sleeve in one piece.
  • the sealing collar is arranged so that water breaking in through the membrane supports its sealing effect.
  • the figure shows a switching device for the display the consumption of a sacrificial anode schematically on average.
  • An electric water heater has an enamelled water container in which a sacrificial anode is arranged. In this there is an interior into which a connecting piece is screwed. The sacrificial anode is held on the water tank by means of the connecting piece.
  • an electrical switching device (1) is screwed onto the connecting piece by means of an internal thread (2).
  • a sealing ring (3) is provided for sealing.
  • the internal thread (2) is formed on a first housing part (4) of the switching device (1).
  • An elastic membrane (6) made of plastic is clamped watertight between the first housing part (4) and a second housing part (5) of the switching device (1).
  • the two housing parts (4, 5) are held together by means of a U-shaped ring (7).
  • a measuring chamber (8) is formed in the first housing part (4) and is connected to the interior of the sacrificial anode via a channel (9).
  • sealing body (10) On the middle, movable section of the membrane (6) sits a sealing body (10), which consists in one piece of a pressure plate (11) and a sleeve (12). It would also be possible to form the sealing body (10) in two pieces, the pressure plate (11) and the sleeve (12) each representing a separate component.
  • the outer circumference of the cuff (12) lies sealingly against the second housing part (5). It is movable in this.
  • the sleeve (12) is arranged such that water entering the intermediate chamber (13) via the membrane (6) causes the sleeve (12) presses outwards on the second housing part (5) and thus increases their sealing effect.
  • a contact disk (14) is fastened centrally to the sealing body (10) and is loaded by a compression spring (15) supported in the housing part (5).
  • the contact disk (14) can carry a soft layer of tin.
  • the housing part (5) there is a contact chamber (16) between the sealing body (10) or the contact disk (14) and the housing part (5).
  • Two switching contacts (17, 18) are arranged on the second housing part (5) and protrude into the contact chamber (16) with tips (19).
  • the housing part (5) consists of an electrically non-conductive plastic.
  • the tips (19) lie in a plane essentially parallel to the contact disk (14), so that the contact disk (14), especially its tin layer, when the membrane (6) jumps over in its switching stroke (H) on the two switching contacts (17, 18) stops. If a three-point support is to be designed instead of this two-point support, then a stop lug can be formed on the housing part (5) in addition to the two tips (19).
  • the membrane (6) If the membrane (6) is still watertight when water enters the measuring chamber (8), then it jumps under the water pressure. It moves the sealing body (10) and thus the contact disk (14) so that it meets the switch contacts (17, 18), whereby the switch contacts (17, 18) are electrically connected. A signal lamp, not shown, now lights up. This is an indication of the need to exchange the Sacrificial anode.
  • the sealing body (10) becomes as described under the pressure of the water entering the intermediate chamber (13) postponed. He does not need to take the membrane (6) with him when he sits loosely on it.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Examining Or Testing Airtightness (AREA)

Claims (6)

  1. Mécanisme de couplage électrique destiné à l'affichage de la consommation d'une anode réactive de chauffe-eau, une chambre de mesure reliée à un espace intérieur de l'anode réactive contenant une membrane, qui assure l'isolation de la chambre de mesure par rapport à une chambre de contact dans laquelle sont agencés des contacts de couplage, qui peuvent être relies grâce à un corps de contact pouvant être déplacé avec la membrane dans une course de couplage,
    caractérisé en ce
    qu'un corps d'étanchéité (10) supportant le corps de contact (14) est disposé sur la membrane (6), le corps d'étanchéité (10) permettant d'isoler la chambre de contact (16) par rapport à la membrane (6).
  2. Mécanisme de couplage selon la revendication 1,
    caractérisé en ce que
    le corps d'étanchéité (10) est positionné de façon mobile sur la membrane (6).
  3. Mécanisme de couplage selon la revendication 1 ou 2,
    caractérisé en ce
    qu'une chambre intermédiaire (13) existe entre une manchette (12) du corps d'étanchéité (10) et la membrane (6), l'eau qui pénètre dans la membrane (6) lorsque celle-ci n'est pas étanche permettant de déplacer le corps d'étanchéité (10) de telle sorte, que le corps de contact (14) touche les contacts de couplage (17,18).
  4. Mécanisme de couplage selon l'une des revendications précédentes,
    caractérisé en ce que
    le corps d'étanchéité (10) présente un plateau de pression (11) et une manchette (12).
  5. Mécanisme de couplage selon la revendication 4,
    caractérisé en ce que
    le corps d'étanchéité (10) est formé d'une seule pièce.
  6. Mécanisme de couplage selon l'une des revendications précédentes,
    caractérisé en ce que
    la manchette (12) est agencée de telle sorte que l'eau faisant irruption soutient son effet d'étanchéité.
EP94107212A 1993-05-13 1994-05-09 Dispositif commutateur pour anode réactive Expired - Lifetime EP0624891B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4316016A DE4316016C2 (de) 1993-05-13 1993-05-13 Elektrische Schalteinrichtung bei einer Opferanode
DE4316016 1993-05-13

Publications (3)

Publication Number Publication Date
EP0624891A2 EP0624891A2 (fr) 1994-11-17
EP0624891A3 EP0624891A3 (fr) 1995-05-10
EP0624891B1 true EP0624891B1 (fr) 1997-10-01

Family

ID=6487995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94107212A Expired - Lifetime EP0624891B1 (fr) 1993-05-13 1994-05-09 Dispositif commutateur pour anode réactive

Country Status (3)

Country Link
EP (1) EP0624891B1 (fr)
AT (1) ATE158893T1 (fr)
DE (1) DE4316016C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105042867B (zh) * 2013-06-05 2018-09-07 广东光晟物联股份有限公司 立式水流开关控制的快热式ptc加热的电热水器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7932910U1 (de) * 1980-03-06 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Flüssigkeitsbehälter der Haustechnik mit einer Opferanode
DE1014629B (de) * 1955-12-20 1957-08-29 Carl Prawitz Druckabhaengiger elektrischer Schalter, insbesondere Bremslichtschalter
DE1870864U (de) * 1963-02-16 1963-04-25 Carl Prawitz Membrandruckschalter.
US4038506A (en) * 1975-07-17 1977-07-26 I.C.S. Ignition Control Systems Ltd. Oil pressure switch having improved diaphragm seal
DE4240591A1 (de) * 1992-12-03 1994-06-09 Stiebel Eltron Gmbh & Co Kg Elektrische Schalteinrichtung für eine Opferanode

Also Published As

Publication number Publication date
DE4316016A1 (de) 1994-11-17
EP0624891A3 (fr) 1995-05-10
ATE158893T1 (de) 1997-10-15
EP0624891A2 (fr) 1994-11-17
DE4316016C2 (de) 1997-02-13

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