EP3571446B1 - Security device for the emergency deactivation of an electric flow heater - Google Patents

Security device for the emergency deactivation of an electric flow heater Download PDF

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Publication number
EP3571446B1
EP3571446B1 EP18704402.9A EP18704402A EP3571446B1 EP 3571446 B1 EP3571446 B1 EP 3571446B1 EP 18704402 A EP18704402 A EP 18704402A EP 3571446 B1 EP3571446 B1 EP 3571446B1
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EP
European Patent Office
Prior art keywords
contact
safety device
countercontact
silver
water heater
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.)
Active
Application number
EP18704402.9A
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German (de)
French (fr)
Other versions
EP3571446A1 (en
Inventor
Christoph Lakemeyer
Michael Grobe
Olaf Diederich
Christian Arnemann
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
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Application filed by Stiebel Eltron GmbH and Co KG filed Critical Stiebel Eltron GmbH and Co KG
Priority to PL18704402T priority Critical patent/PL3571446T3/en
Publication of EP3571446A1 publication Critical patent/EP3571446A1/en
Application granted granted Critical
Publication of EP3571446B1 publication Critical patent/EP3571446B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/08—Terminals; Connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/101—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium using electric energy supply
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems
    • E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
    • E03B7/071—Arrangement of safety devices in domestic pipe systems, e.g. devices for automatic shut-off
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
    • F24H9/2028—Continuous-flow heaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/28—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
    • 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
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0275—Heating of spaces, e.g. rooms, wardrobes
    • H05B1/0283—For heating of fluids, e.g. water heaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/023—Composite material having a noble metal as the basic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/04—Co-operating contacts of different material
    • 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
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H2037/526—Materials for bimetals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/024—Material precious
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2203/00—Form of contacts
    • H01H2203/004—Rivet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00—Connections
    • H01H2207/02—Solder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms

Description

Die Erfindung betrifft eine Sicherheitsvorrichtung zum Notabschalten eines elektrischen Durchlauferhitzers, die Verwendung eines Kontaktniets als Kontakt in der Sicherheitsvorrichtung und einen Durchlauferhitzer mit der Sicherheitsvorrichtung.The invention relates to a safety device for emergency shutdown of an electrical water heater, the use of a contact rivet as a contact in the safety device and a water heater with the safety device.

Im bisherigen Stand der Technik ist bekannt, Sicherheitsvorrichtungen zum Abschalten von Durchlauferhitzern direkt auf die Leiterplatine für die elektrische Steuerung und Versorgung des Durchlauferhitzers anzubringen. Dazu werden die Sicherheitsvorrichtungen mittels Kontaktträgern, die auf die Leiterplatine gelötet bzw. geschweißt sind, mit den Leiterbahnen der Leiterplatine kontaktiert. Bei einer solchen Ausführungsform wird beispielsweise ein Kontaktniet in die Mitte des Kontaktträgers angeordnet und bildet so mit einem Gegenkontakt, der an der Sicherheitsvorrichtung angeordnet ist, eine leitfähige Verbindung.In the prior art it is known to attach safety devices for switching off water heaters directly on the printed circuit board for the electrical control and supply of the water heater. For this purpose, the safety devices are contacted with the conductor tracks of the circuit board by means of contact carriers that are soldered or welded onto the circuit board. In such an embodiment, for example, a contact rivet is arranged in the center of the contact carrier and thus forms a conductive connection with a mating contact that is arranged on the safety device.

Fig. 1 zeigt eine solche Ausführungsform des Standes der Technik, wobei auf eine Platine 21 ein Kontaktträger 22 aufgelötet ist und der Kontaktträger 22 einen Kontaktniet 23 aufweist. Bei dieser Ausführungsform des Stands der Technik ist einerseits die Montage sehr aufwändig, da jeder Kontaktträger einzeln an zwei Stellen angelötet werden muss und andererseits kommt es aufgrund des oft nur schlecht leitenden Kontaktträgers bei den bei Durchlauferhitzern üblichen hohen Stromdurchflüssen zu einer erhöhten Temperaturentwicklung im Umfeld der Kontakte, weshalb oft zusätzliche Maßnahmen erforderlich sind, um die entwickelte Temperatur von den Kontakten
wegzuleiten. In Dokument DE 101 04 438 A1 ist eine Vorrichtung mit den Merkmalen des Oberbegriffs des Anspruchs 1 offenbart. Fig. 1 shows such an embodiment of the prior art, wherein a contact carrier 22 is soldered onto a circuit board 21 and the contact carrier 22 has a contact rivet 23. In this embodiment of the prior art, on the one hand, the assembly is very complex, since each contact carrier has to be soldered individually at two points and, on the other hand, due to the often poorly conductive contact carrier with the high current flows usual with instantaneous water heaters, there is an increased temperature development in the vicinity of the contacts , which is why additional measures are often required to keep the temperature developed by the contacts
to divert. In document DE 101 04 438 A1 an apparatus having the features of the preamble of claim 1 is disclosed.

Es ist daher die Aufgabe der vorliegenden Erfindung, eine verbesserte Sicherheitsvorrichtung für einen Durchlauferhitzer bereitzustellen.It is therefore the object of the present invention to provide an improved safety device for a flow heater.

Diese Aufgabe wird durch eine Sicherheitsvorrichtung zur Notabschaltung eines elektrischen Warmwasserbereiters, insbesondere eines Durchlauferhitzers, oder einer Wärmepumpe gelöst, wobei die Sicherheitsvorrichtung einen Kontakt und einen Gegenkontakt aufweist, die dazu eingerichtet sind, in einem kontaktierten Zustand den Strom zur Versorgung des Durchlauferhitzers zu leiten und in einem geöffneten Zustand die Stromversorgung des Durchlauferhitzers zu unterbrechen. Weiter weist die Sicherheitsvorrichtung eine Haltevorrichtung zum Halten des Gegenkontaktes an einem Zuganker auf, wobei der Zuganker dazu eingerichtet ist, die Haltevorrichtung und den Gegenkontakt von dem Kontakt zu lösen, um eine Stromversorgung des Gerätes zu unterbrechen, wobei die Sicherheitsvorrichtung dadurch gekennzeichnet ist, dass der Kontakt als Kontaktniet ausgestaltet ist, der direkt in die Platine integriert ist.This object is achieved by a safety device for the emergency shutdown of an electric water heater, in particular a water heater, or a heat pump, the safety device having a contact and a mating contact which are designed to conduct the current for supplying the water heater in a contacted state and in to interrupt the power supply of the water heater in an open state. The safety device also has a holding device for holding the mating contact on a tie rod, the tie rod being configured to release the holding device and the mating contact from the contact in order to interrupt a power supply to the device, the safety device being characterized in that the Contact is designed as a contact rivet that is integrated directly into the board.

Im bisherigen Stand der Technik verwendete Kontaktträger, wie zum Beispiel in Fig. 1 gezeigt, bilden bei Kontaktierung des Kontaktes mit dem Gegenkontakt, und somit bei einem Stromfluss durch den Durchlauferhitzer, einen Übergangswiderstand zwischen dem Kontakt und dem auf der Platine befindlichen Kontaktträger. Dieser Übergangswiderstand führt zu einer erhöhten Temperaturentwicklung, so dass zusätzliche Maßnahmen getroffen werden müssen, die Temperaturen von der Platine fernzuhalten, und aus dem Gerät abzuleiten. Durch Ausgestaltung des Kontaktes der Sicherheitsvorrichtung als Kontaktniet, der direkt in die Platine integriert ist, ergibt sich durch den fehlenden Kontaktträger kein Übergangswiderstand zwischen Kontaktträger und Kontaktniet und es ist eine verminderte Temperaturentwicklung zu erwarten.Contact carriers used in the prior art, for example in Fig. 1 shown, when the contact is contacted with the mating contact, and thus when a current flows through the water heater, a transition resistance between the contact and the contact carrier located on the circuit board is formed. This contact resistance leads to an increased temperature development, so that additional measures must be taken to keep the temperatures away from the circuit board and to derive them from the device. By designing the contact of the safety device as a contact rivet that is integrated directly into the board, there is no contact resistance between the contact carrier and the contact rivet due to the lack of a contact carrier and a reduced temperature development is to be expected.

Bei einer direkten Integration des Kontaktniets in die Platine wird der Kontaktniet in eine Öffnung in der Platine eingebracht, insbesondere darin vernietet oder verlötet oder beides, sodass nur ein Teil des Kontaktniets sich oberhalb der Platine befindet. In einer bevorzugten Ausführungsform besteht der Kontaktniet aus einem Kontaktkopf und einem Kontaktschaft, wobei beim direkten Integrieren des Kontaktniets der Kontaktschaft in die Öffnung in der Platine eingebracht wird und der Kontaktkopf sich auf der Platine befindet.In the case of direct integration of the contact rivet into the board, the contact rivet is introduced into an opening in the board, in particular riveted or soldered therein, or both, so that only part of the contact rivet is located above the board. In a preferred embodiment, the contact rivet consists of a contact head and a contact shaft, with the contact shaft being introduced into the opening in the board when the contact rivet is directly integrated and the contact head is located on the board.

Nach einer weiteren bevorzugten Ausführungsform besteht der Kontakt, das heißt der Kontaktniet, aus Vollsilber, Feinkornsilber, insbesondere AgNi 0,15, einem Bimetall oder einem Trimetall. Nach einer weiteren bevorzugten Ausführungsform besteht der Kontakt, das heißt der Kontaktniet, aus einem ersten Kontaktteil und einem zweiten Kontaktteil, wobei der erste Kontaktteil mit dem Gegenkontakt kontaktiert. Insbesondere besteht in dieser Ausführungsform der Kontaktkopf des Kontaktniets aus dem ersten Kontaktteil und dem zweiten Kontaktteil. In einer weiteren bevorzugten Ausführungsform besteht der erste Kontaktteil aus Silber oder Feinkornsilber AgNi 0,15 und der zweite Kontaktteil aus Kupfer. In einer weiteren Ausführungsform sind der erste und der zweite Kontaktteil mit Silber oder Feinkornsilber, insbesondere AgNi 0,15 überzogen, um eine gute Lötbarkeit zu gewährleisten. In einer weiteren Ausführungsform ist nur der zweite Kontaktteil mit Silber oder Feinkornsilber, insbesondere AgNi 0,15 überzogen, um den Anteil von Silber in der Vorrichtung zu verringern und dennoch eine gute Lötbarkeit zu erreichen.According to a further preferred embodiment, the contact, that is to say the contact rivet, consists of solid silver, fine-grain silver, in particular AgNi 0.15, a bimetal or a tri-metal. According to a further preferred embodiment, there is contact that is, the contact rivet, comprising a first contact part and a second contact part, the first contact part making contact with the mating contact. In particular, in this embodiment, the contact head of the contact rivet consists of the first contact part and the second contact part. In a further preferred embodiment, the first contact part consists of silver or fine-grain silver AgNi 0.15 and the second contact part consists of copper. In a further embodiment, the first and the second contact part are coated with silver or fine-grain silver, in particular AgNi 0.15, in order to ensure good solderability. In a further embodiment, only the second contact part is coated with silver or fine-grain silver, in particular AgNi 0.15, in order to reduce the proportion of silver in the device and still achieve good solderability.

In die Platine direkt integriert heißt insbesondere, dass der Kontaktniet mit der Platine vernietet, verlötet oder beides ist.Integrated directly into the circuit board means in particular that the contact rivet is riveted, soldered or both to the circuit board.

In einer Ausführungsform ist der Kontakt, insbesondere der Nietkontakt, dazu eingerichtet, mit der Platine verlötet zu werden, beispielsweise im Anschluss an das Nieten.In one embodiment, the contact, in particular the rivet contact, is set up to be soldered to the circuit board, for example following the riveting.

In einer weiteren bevorzugten Ausführungsform besteht der Gegenkontakt aus Vollsilber, Feinkornsilber AgNi 0,15. einem Bimetall oder einem Trimetall. Weiter bevorzugt ist, dass der Gegenkontakt aus einem ersten Gegenkontaktteil und einem zweiten Gegenkontaktteil besteht, wobei der erste Teil mit dem Kontakt kontaktiert. Es ist weiter bevorzugt, dass der erste Gegenkontaktteil aus Silber oder Feinkornsilber AgNi 0,15 besteht, und der zweite Gegenkontaktteil aus Kupfer besteht. In einer weiteren Ausführungsform ist der erste Gegenkontaktteil und der zweite Gegenkontaktteil oder nur der zweite Gegenkontaktteil mit Silber oder Feinkornsilber AgNi 0,15 umhüllt, um einer gute Lötbarkeit herzustellen.In a further preferred embodiment, the mating contact consists of full silver, fine-grain silver AgNi 0.15. a bimetal or a tri-metal. It is further preferred that the mating contact consists of a first mating contact part and a second mating contact part, the first part making contact with the contact. It is further preferred that the first mating contact part consists of silver or fine-grain silver AgNi 0.15, and the second mating contact part consists of copper. In a further embodiment, the first mating contact part and the second mating contact part or only the second mating contact part are coated with silver or fine-grain silver AgNi 0.15 in order to produce good solderability.

In einer weiter bevorzugten Ausführungsform weist die Haltevorrichtung eine Kontaktbrücke und eine Feder auf und der Gegenkontakt ist auf der Kontaktbrücke angeordnet. Bei dieser Ausführungsform ist weiter bevorzugt, dass die Kontaktbrücke U-förmig ist und die U-förmige Kontaktbrücke in einer Mitte der Kontaktbrücke mit einer Feder verbunden ist, die die Kontaktbrücke mit der Kontaktaufnahme verbindet.In a further preferred embodiment, the holding device has a contact bridge and a spring and the mating contact is arranged on the contact bridge. In this embodiment it is further preferred that the contact bridge is U-shaped and the U-shaped contact bridge is connected in a center of the contact bridge with a spring which connects the contact bridge with the contact receptacle.

Weiter wird die Aufgabe durch eine Verwendung eines Nietkontaktes als Kontakt in einer Sicherheitsvorrichtung nach einer der obigen Ausführungsformen gelöst, wobei der Nietkontakt direkt in die Platine integriert ist. Des Weiteren wird die Aufgabe auch durch einen Durchlauferhitzer mit einer Sicherheitsvorrichtung nach einer der obigen Ausführungsformen gelöst.The object is also achieved by using a rivet contact as a contact in a safety device according to one of the above embodiments, the rivet contact being integrated directly into the circuit board. Furthermore, the task is also carried out by solved a water heater with a safety device according to one of the above embodiments.

Weitere vorteilhafte Ausgestaltungen und Ausführungsformen werden im Folgenden mit Verweis auf die beigefügten Figuren beschrieben, wobei:

Fig. 1
eine schematische Darstellung einer Sicherheitsvorrichtung nach dem bisherigen Stand der Technik,
Fig.2
eine schematische Darstellung einer Sicherheitsvorrichtung gemäß einem Ausführungsbeispiel der Erfindung,
Fig. 3
eine schematische Darstellung eines Kontaktes und eines Gegenkontaktes gemäß einem Ausführungsbeispiel der Erfindung und
Fig. 4
eine weitere schematische Darstellung eines Kontaktes und eines Gegenkontaktes gemäß einem Ausführungsbeispiel der Erfindung zeigt.
Further advantageous configurations and embodiments are described below with reference to the accompanying figures, wherein:
Fig. 1
a schematic representation of a safety device according to the prior art,
Fig. 2
a schematic representation of a safety device according to an embodiment of the invention,
Fig. 3
a schematic representation of a contact and a mating contact according to an embodiment of the invention and
Fig. 4
shows a further schematic representation of a contact and a mating contact according to an embodiment of the invention.

Figur 2 zeigt eine schematische Darstellung der Sicherheitsvorrichtung 1 gemäß einem Ausführungsbeispiel der Erfindung. Dabei weist die Sicherheitsvorrichtung 1 in diesem Ausführungsbeispiel einen Kontakt 3 und einen Gegenkontakt 4 auf. Weiter weist die Sicherheitsvorrichtung 1 eine Haltevorrichtung auf, die wiederum eine U-förmige Kontaktbrücke 10 mit einer Verbreiterung 11 am Ende jedes der Schenkel aufweist. Die Kontaktbrücke 10 ist mittels einer Kontaktfeder 8 mit einer Kontaktaufnahme 6 der Sicherheitsvorrichtung 1 verbunden. Weiter weist die Sicherheitsvorrichtung 1 Trennfedern 5, einen Zuganker 7 und eine Spule 9 auf, deren Funktion weiter unten beschrieben wird. Figure 2 shows a schematic representation of the safety device 1 according to an embodiment of the invention. In this embodiment, the safety device 1 has a contact 3 and a mating contact 4. The safety device 1 also has a holding device, which in turn has a U-shaped contact bridge 10 with a widening 11 at the end of each of the legs. The contact bridge 10 is connected to a contact receptacle 6 of the safety device 1 by means of a contact spring 8. The safety device 1 also has separating springs 5, a tie rod 7 and a coil 9, the function of which is described below.

Der Kontakt 3 ist in einer erfindungsgemäßen Ausführungsform als Kontaktniet ausgeführt und direkt mit einer Leiterplatine 2 verbunden, insbesondere vernietet, alternativ verlötet. Desweiteren kann der Kontaktniet durch eine Kombination aus Vernieten und Löten mit der Leiterplatte 2 verbunden werden. Somit steht der Kontakt 3 im direkten Kontakt mit den zum Steuern und Betreiben des Durchlauferhitzers verwendeten elektrischen Leitungswegen auf der Leiterplatine 2.In one embodiment according to the invention, the contact 3 is designed as a contact rivet and is connected directly to a printed circuit board 2, in particular riveted or alternatively soldered. Furthermore, the contact rivet can be connected to the circuit board 2 by a combination of riveting and soldering. The contact 3 is thus in direct contact with the electrical conduction paths on the printed circuit board 2 used to control and operate the water heater.

Eine bevorzugte Ausführungsform des Kontaktes 3 und des Gegenkontaktes 4 werden im Folgenden anhand von Fig. 3 näher erläutert. Fig. 3 zeigt eine schematische Darstellung eines Kontaktes 3 und eines Gegenkontaktes 4 gemäß einem Ausführungsbeispiel der Erfindung. Der Kontakt 3 ist nach einer erfindungsgemäßen Ausführungsform als Kontaktniet ausgebildet und weist einen Kontaktkopf 33 und einen Kontaktschaft 34 auf. Zum direkten Integrieren des Kontaktes 3 wird der Kontaktschaft 34 des Kontaktes 3 in eine Öffnung der Leiterplatine 2 eingebracht, sodass nur der Kontaktkopf 33 des Kontaktes 3 über die Leiterplatine 2 hinausragt. In einer bevorzugten Ausführungsform wird der Kontakt 3 in der Leiterplatine 2 vernietet. Alternativ oder zusätzlich kann vor dem Einbringen ein Lötmittel 36 in der Öffnung bereitgestellt werden. Der Kontakt 3 kann dann mit der Leiterplatine 2 verlötet werden. Weiter weist der Kontakt 3 in einer bevorzugten Ausführungsform einen ersten Kontaktteil 31 und einen zweiten Kontaktteil 32 auf. Der erste Kontaktteil besteht in einer bevorzugten Ausführungsform aus Silber oder Feinkornsilber AgNi 0,15 und der zweite Kontaktteil 32 des Kontaktes 3 besteht aus Kupfer. Zum Schutz gegen Oxidation und zur besseren Lötfähigkeit ist der komplette Kontakt 3 mit Silber oder Feinkornsilber AgNi 0,15 umhüllt.A preferred embodiment of the contact 3 and the mating contact 4 are described below with reference to FIG Fig. 3 explained in more detail. Fig. 3 shows a schematic representation a contact 3 and a mating contact 4 according to an embodiment of the invention. According to an embodiment of the invention, the contact 3 is designed as a contact rivet and has a contact head 33 and a contact shaft 34. For the direct integration of the contact 3, the contact shaft 34 of the contact 3 is introduced into an opening in the circuit board 2, so that only the contact head 33 of the contact 3 protrudes beyond the circuit board 2. In a preferred embodiment, the contact 3 is riveted in the printed circuit board 2. Alternatively or in addition, a solder 36 can be provided in the opening prior to the introduction. The contact 3 can then be soldered to the printed circuit board 2. Furthermore, in a preferred embodiment, the contact 3 has a first contact part 31 and a second contact part 32. In a preferred embodiment, the first contact part consists of silver or fine-grain silver AgNi 0.15 and the second contact part 32 of the contact 3 consists of copper. To protect against oxidation and for better solderability, the entire contact 3 is coated with silver or fine-grain silver AgNi 0.15.

Der Kontakt 3 ist so ausgebildet, dass er bei normalem Betrieb des Durchlauferhitzers den Gegenkontakt 4 kontaktiert. Der Gegenkontakt 4 ist auf der Verbreiterung 11 der U-förmigen Kontaktbrücke 10 der Haltevorrichtung angeordnet und als Gegenkontaktniet ausgebildet. In einer bevorzugten Ausführungsform weist auch der Gegenkontakt 4 einen ersten Gegenkontaktteil 41 und einen zweiten Gegenkontaktteil 42 auf. Dabei wird der erste Gegenkontaktteil 41 bevorzugt ebenfalls aus Silber oder Feinkornsilber AgNi 0,15 und der zweite Gegenkontaktteil 42 aus Kupfer gebildet. Der Gegenkontakt ist dann ebenfalls mit Silber oder Feinkornsilber AgNi 0,15 umhüllt.The contact 3 is designed in such a way that it makes contact with the mating contact 4 during normal operation of the flow heater. The mating contact 4 is arranged on the widening 11 of the U-shaped contact bridge 10 of the holding device and is designed as a mating contact rivet. In a preferred embodiment, the mating contact 4 also has a first mating contact part 41 and a second mating contact part 42. The first mating contact part 41 is preferably also formed from silver or fine-grain silver AgNi 0.15 and the second mating contact part 42 is formed from copper. The mating contact is then also coated with silver or fine-grain silver AgNi 0.15.

Fig. 4 zeigt eine andere Ausführungsform des Gegenkontaktes 4. In dieser Ausführungsform ist die Verbreiterung 11 hinterprägt und bildet eine Ausformung 44. Der Gegenkontakt wird von einem Silberdraht abgeschnitten und über die Ausformung 44 plattiert. Damit bildet der plattierte Silberdraht eine Kontaktschicht 43. Diese Ausführungsform hat den Vorteil, dass der Silberanteil an den Kontakten verringert werden kann und eine Behinderung der Trennungsmechanik durch überstehende Teile auf der dem Gegenkontakt 4 gegenüberliegenden Seite der Verbreiterung 11 vermieden werden kann. Fig. 4 shows another embodiment of the mating contact 4. In this embodiment, the widening 11 is embossed and forms a recess 44. The mating contact is cut off from a silver wire and plated over the recess 44. The plated silver wire thus forms a contact layer 43. This embodiment has the advantage that the silver content of the contacts can be reduced and an obstruction of the separation mechanism by protruding parts on the side of the widening 11 opposite the counter contact 4 can be avoided.

Im Folgenden wird die erfindungsgemäße Funktionsweise der Sicherheitsvorrichtung 1 anhand von Fig. 2 beschrieben. Im normalen Betrieb des Durchlauferhitzers befindet sich der Zuganker 7 in einer so arretierten Position, dass er die Kontaktaufnahme 6 gegen die Federkräfte der Trennfedern 5 nach unten drückt und damit über die Kontaktfedern 8 auch die Haltevorrichtung mit der Kontaktbrücke 10 nach unten drückt. Dadurch wird der Gegenkontakt 4, der sich an der Kontaktbrücke 10 befindet, gegen den direkt auf der Platine befindlichen Kontakt 3 gedrückt. Der den Durchlauferhitzer versorgende Strom fließt somit über die Sicherheitsvorrichtung 1 durch den Gegenkontakt 4 in den Kontakt 3 und wird von Kontakt 3 auf die entsprechenden Leitungen der Leiterplatine 2 übertragen. Da der Kontakt 3 direkt in die Leiterplatine 2 integriert ist, das heißt, im direkten Kontakt mit den auf der Leiterplatine 2 aufgebrachten Leitungen zur Versorgung des Durchlauferhitzers steht, kann der Widerstand zwischen Kontakt und den Leiterbahnen in der Leiterplatine gering gehalten werden und es kommt zu einer verminderten Wärmeentwicklung, selbst bei großen Strömen, die zum Betreiben eines Durchlauferhitzers benötigt werden.The mode of operation of the safety device 1 according to the invention is described below with reference to FIG Fig. 2 described. During normal operation of the instantaneous water heater, the tie rod 7 is in a locked position such that it presses the contact receptacle 6 downward against the spring forces of the separating springs 5 and thus over the contact springs 8 also presses the holding device with the contact bridge 10 downwards. As a result, the mating contact 4, which is located on the contact bridge 10, is pressed against the contact 3 located directly on the board. The current supplying the water heater thus flows via the safety device 1 through the mating contact 4 into the contact 3 and is transmitted from the contact 3 to the corresponding lines on the printed circuit board 2. Since the contact 3 is integrated directly into the printed circuit board 2, that is, in direct contact with the lines applied to the printed circuit board 2 for supplying the water heater, the resistance between the contact and the conductor tracks in the printed circuit board can be kept low and it comes to a reduced heat development, even with large currents that are required to operate a continuous flow heater.

Tritt ein Fehler beim Betreiben des Durchlauferhitzers auf, wird die Arretierung des Zugankers 7 mittels der Spule 9, die als Aktor wirkt, entfernt und die Kontaktaufnahme 6 wird durch die Federkraft der Trennfedern 5 nach oben bewegt. Dadurch wird der Kontakt zwischen Gegenkontakt 4 und Kontakt 3 unterbrochen und ein Stromfluss in den Durchlauferhitzer ist erst wieder möglich, wenn ein Nutzer manuell die Kontaktaufnahme 6 in die untere Endstellung bringt, wodurch diese wieder durch eine in der Spule integrierte Feder über den Zuganker 7 arretiert wird. Dadurch wird ein sicherer Gebrauch des Durchlauferhitzers gewährleistet.If an error occurs when operating the water heater, the locking of the tie rod 7 is removed by means of the coil 9, which acts as an actuator, and the contact 6 is moved upwards by the spring force of the separating springs 5. This interrupts the contact between mating contact 4 and contact 3 and a current flow into the water heater is only possible again when a user manually brings the contact receptacle 6 into the lower end position, whereby it is locked again by a spring integrated in the coil over the tie rod 7 becomes. This ensures safe use of the instantaneous water heater.

Obwohl in der oben beschriebenen Ausführungsform die Haltevorrichtung eine U-förmige Kontaktbrücke 10 aufweist, kann in einer anderen Ausführungsform die Haltevorrichtung auch eine anders geformte Kontaktbrücke, zum Beispiel eine V-förmig geformte Kontaktbrücke, aufweisen, oder die Haltevorrichtung könnte so ausgebildet sein, dass die Kontaktbrücke 10 direkt mit der Kontaktfeder 8 verbunden ist.Although in the embodiment described above, the holding device has a U-shaped contact bridge 10, in another embodiment the holding device can also have a differently shaped contact bridge, for example a V-shaped contact bridge, or the holding device could be designed so that the Contact bridge 10 is connected directly to contact spring 8.

Obwohl in der obigen Ausführungsform die Kontaktbrücke 10 Verbreiterungen 11 zum Anbringen des Gegenkontakts 4 aufweist, kann in einer anderen Ausführungsform die Anbringung der Gegenkontakte 4 an die Kontaktbrücke 10 anders ausgestaltet sein und insbesondere keine Verbreiterung aufweisen.Although in the above embodiment the contact bridge 10 has widenings 11 for attaching the mating contact 4, in another embodiment the attachment of the mating contacts 4 to the contact bridge 10 can be configured differently and in particular have no widening.

Obwohl in dem oben beschriebenen Ausführungsbeispiel der Kontakt 3 und der Gegenkontakt 4 als Bimetall mit einem Feinkornsilberteil und einem Kupferteil ausgebildet sind, kann in einer anderen Ausführungsform der Kontakt 3 und der Gegenkontakt 4 auch aus einem einzigen leitenden Material bestehen oder mehr als zwei Teile aus verschiedenen Metallen aufweisen. Außerdem könnten der erste und der zweite Teil des Kontakts und/oder Gegenkontakts aus anderen Metallen als oben beschrieben bestehen.Although in the embodiment described above the contact 3 and the mating contact 4 are designed as a bimetal with a fine-grain silver part and a copper part, in another embodiment the contact 3 and the mating contact 4 can also consist of a single conductive material or more than two parts of different Have metals. In addition, the first and the second part of the contact and / or mating contact could consist of other metals than described above.

Claims (11)

  1. A safety device (1) for the emergency shutdown of an electric water heater, in particular an instantaneous water heater, or a heat pump, the safety device (1) including:
    a contact (3) and a countercontact (4), which are arranged, in a conducting state, to conduct the power for supplying the instantaneous water heater, and, in an opened state, to interrupt the power supply of the instantaneous water heater,
    a retaining device for retaining the countercontact (4) on a tension rod (7), wherein the tension rod (7) is arranged to disengage the retaining device and the countercontact (4) from the contact (3) to interrupt a power supply of the instantaneous water heater,
    wherein the safety device (1) is characterised in that the contact (3) is configured as a contact rivet directly integrated in a printed circuit board (2).
  2. The safety device (1) according to claim 1, wherein the contact (3) and/or the countercontact (4) consist of solid silver, fine-grain silver, in particular AgNi 0.15, a bimetal or a trimetal.
  3. The safety device (1) according to one of the preceding claims, wherein the contact (3) consists of a first contact part (31) and a second contact part (32), wherein the first contact part (31) makes contact with the countercontact (4).
  4. The safety device (1) according to claim 3, wherein the first contact part (31) consists of silver or fine-grain silver, in particular AgNi 0.15, and the second contact part (32) consists of copper.
  5. The safety device (1) according to one of the preceding claims, wherein the contact rivet (3) is arranged to be soldered with the printed circuit board (2).
  6. The safety device (1) according to one of the preceding claims, wherein the countercontact (4) consists of a first countercontact part (41) and a second countercontact part (42), wherein the first countercontact part (41) makes contact with the contact (3), wherein the first countercontact part (41) consists in particular of silver or fine-grain silver AgNi 0.15, and/or the second countercontact part (42) consists in particular of copper.
  7. The safety device (1) according to one of the preceding claims, wherein the contact (3) and/or the countercontact (4) is coated with a layer consisting of silver or fine-grain silver, in particular AgNi 0.15.
  8. The safety device (1) according to one of the preceding claims, wherein the retaining device includes a contact bridge (10) and a spring (5), and the countercontact (4) is disposed on the contact bridge (10).
  9. The safety device (1) according to claim 8, wherein the contact bridge (10) is U-shaped, and the U-shaped contact bridge (10) is connected, in a centre of the contact bridge (10), to a spring (8) connecting the contact bridge (10) to the contact support (6).
  10. Use of a rivet contact as a contact (3) in a safety device (1) according to one of claims 1 to 9, wherein the rivet contact is directly integrated in the printed circuit board (2).
  11. An instantaneous water heater comprising a safety device (1) according to one of claims 1 to 9.
EP18704402.9A 2017-01-19 2018-01-10 Security device for the emergency deactivation of an electric flow heater Active EP3571446B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18704402T PL3571446T3 (en) 2017-01-19 2018-01-10 Security device for the emergency deactivation of an electric flow heater

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017000438.2A DE102017000438A1 (en) 2017-01-19 2017-01-19 Safety device for emergency shutdown of an electric instantaneous water heater
PCT/EP2018/050508 WO2018134092A1 (en) 2017-01-19 2018-01-10 Security device for the emergency deactivation of an electric flow heater

Publications (2)

Publication Number Publication Date
EP3571446A1 EP3571446A1 (en) 2019-11-27
EP3571446B1 true EP3571446B1 (en) 2021-05-12

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EP18704402.9A Active EP3571446B1 (en) 2017-01-19 2018-01-10 Security device for the emergency deactivation of an electric flow heater

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US (1) US11152177B2 (en)
EP (1) EP3571446B1 (en)
CN (1) CN110249188B (en)
DE (1) DE102017000438A1 (en)
PL (1) PL3571446T3 (en)
PT (1) PT3571446T (en)
WO (1) WO2018134092A1 (en)

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DE102020111516A1 (en) 2020-04-28 2021-10-28 Stiebel Eltron Gmbh & Co. Kg Safety device for electrical equipment

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Also Published As

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CN110249188B (en) 2021-06-01
DE102017000438A1 (en) 2018-07-19
WO2018134092A1 (en) 2018-07-26
US11152177B2 (en) 2021-10-19
EP3571446A1 (en) 2019-11-27
CN110249188A (en) 2019-09-17
US20190341212A1 (en) 2019-11-07
PT3571446T (en) 2021-07-05
PL3571446T3 (en) 2021-11-22

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