EP0164816B1 - Elektrischer Wassererhitzer - Google Patents

Elektrischer Wassererhitzer Download PDF

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Publication number
EP0164816B1
EP0164816B1 EP19850301074 EP85301074A EP0164816B1 EP 0164816 B1 EP0164816 B1 EP 0164816B1 EP 19850301074 EP19850301074 EP 19850301074 EP 85301074 A EP85301074 A EP 85301074A EP 0164816 B1 EP0164816 B1 EP 0164816B1
Authority
EP
European Patent Office
Prior art keywords
water
outlet
chamber
electrical
inlet
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
EP19850301074
Other languages
English (en)
French (fr)
Other versions
EP0164816A2 (de
EP0164816A3 (en
Inventor
John David Holland
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.)
STEAMY PRODUCTS (PRIVATE) Ltd
Original Assignee
STEAMY PRODUCTS (PRIVATE) Ltd
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 STEAMY PRODUCTS (PRIVATE) Ltd filed Critical STEAMY PRODUCTS (PRIVATE) Ltd
Priority to AT85301074T priority Critical patent/ATE57758T1/de
Publication of EP0164816A2 publication Critical patent/EP0164816A2/de
Publication of EP0164816A3 publication Critical patent/EP0164816A3/en
Application granted granted Critical
Publication of EP0164816B1 publication Critical patent/EP0164816B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F24H1/102—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 with resistance
    • F24H1/103—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 with resistance with bare resistances in direct contact with the fluid

Definitions

  • This invention relates to an electrically operated water heating device of the kind adapted to give substantially instantaneous hot water without the need for pre-heating and storage. More specifically the invention relates to an electrically operated water heating device comprising a housing having a water inlet and a water outlet, a water heating chamber containing an electrical heating element arranged between the inlet and outlet such that water passing between the inlet and outlet must pass through the chamber in contact with the element and pressure responsive means displaceable in response to water pressure in the chamber to cause contact between fixed and movable electrical contacts to complete an electrical circuit supplying current to the element such that the element is energised to heat water in the chamber only when there is a predetermined water pressure in the chamber.
  • a device of the above kind is known from AU ⁇ B ⁇ 489438.
  • One of the most serious problems associated with water heating devices in which water passes in contact with an electrically energised heating element is the danger of current leakageto the water. In the event of failure of the earthing system such current leakage is potentially lethal, especially in the confines of a shower cubicle.
  • the outlet comprises a nozzle which will limit the volume of water passing through the device and atomise water leaving the outlet, i.e. convert it into an aerosol spray.
  • Figure 1 is a side elevation
  • Figure 2 is a side sectional elevation of a device in accordance with the invention.
  • the device indicated generally at 10 is a water heater with combined shower head.
  • the tubular housing 52 of the device is closed at its top end by a cap assembly 34 and at its lower end terminates in a shower rose head 18.
  • the housing 52 has a lateral water inlet 12 through which water enters a water heating chamber 20. Water leaves the chamber 20 via an outlet nozzle 16 at the upper end of a downwardly directed outlet tube 51 which opens at its lower end to the shower rose 18.
  • the inlet 12 has a restriction 14 related to the restriction represented by the nozzle 16 such that the volume of water entering the heating chamber 20 cannot exceed the volume escaping from it.
  • the nozzle 16 is adapted to atomise the water entering the tube 51, i.e. to turn it into an aerosol spray, before it emerges from a shower rose head 18. This process of atomising the water through nozzle 16 enhances the safety of the device 10 since any current leakage to the water is dissipated almost entirely.
  • a coiled heating element 22 is mounted on a support assembly 24 in the heating chamber 20.
  • the element 22 is a coiled, non-ferrous bare or uninsulated element wound around the support assembly 24, the latter preferably being moulded from a light weight, strong thermoplastics material with a melting point of up to 400 degrees centigrade.
  • the assembly 24 comprises four separate, identical segments which interlock on assembly. The individual segments have holes 26 to enable free passage of water so that the water will come into contact with a high proportion of the surface of the element 22. Because of the design of the assembly 24 combined with use of an uninsulated heating element 22 greater thermal efficiency is achieved thereby allowing the element 22 to be of a relatively low resistance type, resulting in longer life expectancy and lower current consumption.
  • the non-ferrous element 22 is corrosion resistant which should further enhance the life expectancy of this component.
  • An electrical switching mechanism to control the supply of current to the element 22 comprises a pair of movable contacts 28 mounted in a watertight manner by a rigid support washer 30 on a flexible diaphragm 32 which forms the roof of the heating chamber 20.
  • the terminals 28 are connected at their lower ends to the ends of the element 22 and a semi-rigid wire support (not shown) connects the support assembly 24 to the flexible diaphragm 32 in a spaced-apart relation but such that the element 22 on its support 24 moves up and down in sympathy with the diaphragm 32.
  • the cap assembly 34 is secured to the housing 52 by cooperating screw threads 53 during assembly of the device 10.
  • the periphery of the diaphragm 32 is thus clamped between the cap 34 and housing 52 and forms a watertight seal.
  • Mounted on the cap 34 are fixed contacts 36 positioned so that they will touch the respective movable contacts 28 when the latter rise with the diaphragm 32.
  • the device 10 is in an inoperative mode. Under the influence of gravity the element 22 and its support assembly 24 have pulled the diaphragm 32 downward so that the fixed 36 and movable 28 contacts are spaced apart.
  • water is admitted to the heating chamber 20 through the inlet 12 its pressure will raise the diaphragm 32 until the contacts 28 touch the contacts 36 so that the heating element 22 is energised.
  • the upper ends of the fixed contacts or terminals 36 and 38 have respectively connected to them the live, neutral and earth wires of an electric cable (not shown) entering the device 10 through a terminal cover 42 mounted on the cap 34.
  • An inlet duct 54 of the terminal cover is externally threaded to receive a cable gland.
  • the terminal cover 42 is rotatable relative to the cap 34 to provide freedom of cable positioning during installation of the device 10.
  • the duct 54 has a restriction 44 intended to minimise the possibility of water entering the area of the electrical contacts from this source.
  • the cap 34 has a peripheral well or recess 46 in which water can collect to keep it away from the electrical contacts.
  • the removable shower head or rose cap 18 is connected to the housing 52 by a quick-release thread 55 such that it will release from the housing 52 in approximately a quarter turn.
  • the rose cap 18 includes an integrally moulded sealing formation 48 which removes the necessity for a rubber sealing ring or the like which can become detached and lost. Sealing is automatic as the rose head 18 is screwed onto the housing 52.
  • the outlet holes 50 of the rose cap 18 are each tapered similarly to a funnel. It has been found that this allows easy cleaning of the shower rose 18 since dirt lodges in the tapered holes and can be removed merely by releasing the rose 18 from the unit and banging lightly in an inverted position against a firm surface. This arrangement contrasts favourably with conventional roses the holes of which normally have to be cleaned individually e.g. by pushing a pin through the hole.
  • the disclosed switching method although simple is extremely robust and in operation it is expected that the contacts will not need attention during the lifetime of the device. This contrasts favourably with devices using micro switches which do not adequately cope with the 5 to 7 kw current passing through them so that they burn and require early replacement.
  • the device is primarily made from moulded durable plastics material which is of course non-conductive or corrosive.
  • the device of the invention would normally include an earth arrangement in the form of a length of wire bared (i.e. stripped of insulation) at one end and located in the zone of the emergent aerosol spray and taken separately to earth. This arrangement could be advantageous in areas prone to frequent electrical thunder storms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Bathtubs, Showers, And Their Attachments (AREA)
  • Nozzles (AREA)

Claims (8)

1. Ein elektrisch betriebener Wassererhitzer (10) mit einem Gehäuse (52), das einen Wassereinlaß (12) und einen Wasserauslaß (51), eine Wasserheizkammer (20), die ein elektrisches Heizelement (22) aufweist, das zwischen dem Einlaß (12) und dem Auslaß (51) derart angeordnet ist, daß Wasser, das sich zwischen dem Einlaß (12) und dem Auslaß (51) befindet, in Kontakt mit dem Element (22) durch die Kammer (20) fließen muß, und eine auf Druck reagierende Vorrichtung (32) umfaßt, die in Reaktion auf Wasserdruck in der Kammer (20) verschiebbar ist, um einen Kontakt zwischen feststehenden (36) und beweglichen (28) elektrischen Kontakten zu verursachen, um einen elektrischen Stromkreis zu schließen, der das Element (22) mit Strom speist, so daß das Element (22) nur dann zum Aufheizen des Wassers in der Kammer (20) erregt wird, wenn ein vorbestimmter Wasserdruck in der Kammer (20) vorhanden ist, dadurch gekennzeichnet, daß der Auslaß (51) eine Düse (16) aufweist, die das Volumen des durch das Gerät (10) fließenden Wassers begrenzt und das den Auslaß (51) verlassende Wasser zerstäubt.
2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß das Element (22) nicht isoliert ist.
3. Gerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Auslaß als nach unten gerichtetes Auslaßrohr (51) ausgebildet ist, wobei die Düse (16) im Bereich ihres oberen Endes positioniert ist.
4. Gerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein Erdungsdraht (40) vorgesehen ist, der einen blanken bzw. unisolierten Teil aufweist, der in der Zone (40) des den Auslaß (51) verlassenden Aerosol-Sprühnebels herabhängt.
5. Gerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das elektrische Element (22) aus einem Nichteisenmetall hergestellt ist.
6. Gerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das elektrische Element (22) auf einer Stützbaugruppe (24) aus einem Thermoplast-Material mit hohem Schmelzpunkt montiert ist und vier im wesentlichen identische Segmente aufweist, die nach dem Zusammenbauen zum Stützen des Elements (22) auf eine Weise ineinander eingreifen, die es ermöglicht, daß das Wasser mit dem größeren Teil des Oberflächenbereiches des Elements (22) in Kontakt kommt.
7. Gerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein Brausekopf (18) vorgesehen ist, der Wasser von dem Auslaß (51) aufnimmt, wobei der Brausekopf (18) spitz zulaufende Öffnungen (50) aufweist.
8. Gerät nach Anspruch 7, dadurch gekennzeichnet, daß der Brausekopf (18) mit dem Gehäuse (51) durch eine selbstabdichtende Anordnung (40) in Verbindung mit Schnellöse-Gewinden (55) verbunden ist.
EP19850301074 1984-02-20 1985-02-19 Elektrischer Wassererhitzer Expired - Lifetime EP0164816B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85301074T ATE57758T1 (de) 1984-02-20 1985-02-19 Elektrischer wassererhitzer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZW29/84A ZW2984A1 (en) 1984-02-20 1984-02-20 Electrically operated water heating device
ZW2984 1984-02-20

Publications (3)

Publication Number Publication Date
EP0164816A2 EP0164816A2 (de) 1985-12-18
EP0164816A3 EP0164816A3 (en) 1987-10-07
EP0164816B1 true EP0164816B1 (de) 1990-10-24

Family

ID=25590251

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850301074 Expired - Lifetime EP0164816B1 (de) 1984-02-20 1985-02-19 Elektrischer Wassererhitzer

Country Status (10)

Country Link
EP (1) EP0164816B1 (de)
AP (1) AP41A (de)
AT (1) ATE57758T1 (de)
AU (1) AU580578B2 (de)
DE (1) DE3580191D1 (de)
ES (1) ES540515A0 (de)
NZ (1) NZ211161A (de)
PT (1) PT79976B (de)
ZA (1) ZA851153B (de)
ZW (1) ZW2984A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3626955A1 (de) * 1986-08-08 1988-02-18 Bosch Siemens Hausgeraete Durchlauferhitzer
NZ334223A (en) * 1996-08-19 2000-05-26 Joao Carlos Martins Gomes Electric shower head comprising a shell-shaped body
GB2395899B (en) * 2002-12-02 2005-02-09 Michael Weir Instant boiling water tap
BRPI0905319B1 (pt) * 2009-12-04 2020-09-24 Cláudio Lourenço Lorenzetti Aperfeiçoamento em chuveiro elétrico
US9052121B2 (en) 2011-11-30 2015-06-09 Intelligent Energy, Llc Mobile water heating apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU489438B2 (en) * 1975-08-01 1977-02-03 Lorenzetti Lorenzo Water heating device
FR2376702A1 (fr) * 1977-01-10 1978-08-04 Lorenzetti Alexandre Douche a chauffage electrique
IL59790A0 (en) * 1979-04-17 1980-06-30 Kozyheat Ltd Water heater and regulating valve for use therewith

Also Published As

Publication number Publication date
ES8603057A1 (es) 1985-12-01
ATE57758T1 (de) 1990-11-15
DE3580191D1 (de) 1990-11-29
ZW2984A1 (en) 1987-06-24
AP8500007A0 (en) 1985-02-01
ES540515A0 (es) 1985-12-01
AU580578B2 (en) 1989-01-19
PT79976A (en) 1985-03-01
AP41A (en) 1989-05-04
NZ211161A (en) 1989-01-06
AU3871985A (en) 1985-08-29
ZA851153B (en) 1985-09-25
PT79976B (en) 1986-10-28
EP0164816A2 (de) 1985-12-18
EP0164816A3 (en) 1987-10-07

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