EP2438364B1 - Electrical heating device - Google Patents

Electrical heating device Download PDF

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Publication number
EP2438364B1
EP2438364B1 EP10705275.5A EP10705275A EP2438364B1 EP 2438364 B1 EP2438364 B1 EP 2438364B1 EP 10705275 A EP10705275 A EP 10705275A EP 2438364 B1 EP2438364 B1 EP 2438364B1
Authority
EP
European Patent Office
Prior art keywords
heating
heating element
electrical
support plate
thermostat
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
EP10705275.5A
Other languages
German (de)
French (fr)
Other versions
EP2438364A2 (en
Inventor
Christopher William Ragg
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.)
Munster Simms Engineering Ltd
Original Assignee
Munster Simms Engineering Ltd
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Filing date
Publication date
Application filed by Munster Simms Engineering Ltd filed Critical Munster Simms Engineering Ltd
Publication of EP2438364A2 publication Critical patent/EP2438364A2/en
Application granted granted Critical
Publication of EP2438364B1 publication Critical patent/EP2438364B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F24H9/2021—Storage 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
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/128—Preventing overheating
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/25—Temperature of the heat-generating means in the heater
    • 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
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/355—Control of heat-generating means in heaters
    • F24H15/37—Control of heat-generating means in heaters of electric 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
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based

Definitions

  • This invention relates to an electrical heating device for heating water and in particular to a dual element electrical heating device having a common thermostat.
  • the or each heating element is typically associated with a thermostat arranged to cut off power to the heating element should the temperature of the heating element exceed safe levels.
  • a separate thermostat is typically required for each heating element, resulting in increased cost and complexity.
  • Each heating element may comprise an elongate member having electrical connectors on opposite ends thereof, at least a portion of the elongate member of each heating element being in thermal contact with said thermostat.
  • the support plate may define at least part of a wall of a vessel for containing water to be heated by the heating elements.
  • Each heating element may pass through the support plate to define an elongate internal portion that extends into at least part of the vessel interior and an external portion provided with said electrical connectors for connecting the heating elements to a power supply.
  • each heating element extends in a loop.
  • a portion of the loop of each heating element preferably a distal end of the loop, engages the support plate at a common location, preferably spaced from or adjacent to said electrical connectors.
  • all of the heating elements engage the support plate at said common location on said support plate, whereby the thermostat may be mounted on an outer side of the support plate adjacent said common location such that the thermostat is simultaneously in thermal contact with all of the heating elements.
  • the heating device comprises two heating elements.
  • each heating element preferably comprises a first portion extending from the support plate in a direction substantially perpendicular to the support plate and a distal portion extending parallel to said first portion, towards said support plate, such that the heating element is effectively folded back on itself, whereby a looped end of the distal portion each heating element contacts the inner surface of the support plate to be in thermal contact with the thermostat.
  • the thermostat may comprise material which undergoes physical changes in response to changes in the temperature. In response to this physical change, thermostat may open a switch that deactivates the heating elements.
  • the thermostat may comprise an electronic control unit and a temperature sensor that transmits signals to the control unit indicative of the temperature of the heating elements.
  • an electrical heating device 10 comprising dual heating elements 20,30 for heating water within a vessel, comprising a first heating element 20 and a second heating element 30 arranged substantially parallel to each other in nested or overlapping relationship, each heating element 20,30 being adapted to be in thermal contact with a single overheat prevention thermostat 40, as will be described below in more detail.
  • the heating elements 20,30 are mounted a common support plate 50, the support plate 50 being adapted to form part of the wall of a water vessel or tank for holding water to be heated.
  • Each heating element 20,30 comprises an elongate element comprising a stainless steel tubular outer sheath 100 having an electrical resistance heating wire 102 disposed therein.
  • the ends of each heating element 20,30 extend through the support plate 50 and electrical connectors 104, 106, 108 are provided on the terminal ends thereof for connection to a power supply whereby each heating element 20,30 can be independently heated.
  • Each heating element 20,30 extends from an inner surface of the support plate in a loop, each element having first and second sides extending from the respective ends of the heating element in parallel relationship the first and second sides being joined by a distal loop 60,70.
  • the first and second sides of each heating element 20,30 are bent or folded through 180° such that the distal loop 60,70 thereof is located adjacent and vertically spaced from the terminal ends of the heating element 20,30, whereby the distal loops 60,70 are in contact with the inner surface of the support plate 50 at a location spaced from the terminal ends of the heating element.
  • each heating element 20,30 extend through the support plate 50 at respective locations spaced from one another diagonally on the support plate 50 (see Figure 2 ) such that the heating elements 20,30 are arranged in nested or overlapping parallel relationship with the distal loops 60,70 of the heating element 20,30 being in contact with the inner face of the support plate 50 alongside one another at a common location.
  • the thermostat 40 is mounted on the outer face of the support plate 50 adjacent said common location, whereby the thermostat 40 is in thermal contact with the distal loop 60,70 of both the first and second heating elements 20,30, through said common location on the support plate 50.
  • the distal loops 60,70 of the heating elements 20,30 may be joined to the support plate by brazing or welding to enhance thermal contact between the heating elements and the thermostat and to increase the strength of the heating device.

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)
  • Computer Hardware Design (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Description

  • This invention relates to an electrical heating device for heating water and in particular to a dual element electrical heating device having a common thermostat.
  • Electrical resistance heating elements are commonly used to heat water. Dual element heating devices are often used where different rates of heating are required, for example to suit the flow rate and/or temperature of the water to be heated. Such arrangement of dual heating elements is often provided in an electric shower to compensate for variation in the temperature of the water supply to the shower while providing a substantially constant flow rate through the water heater.
  • In order to prevent damage to the heating element(s) and/or the risk of fire due to overheating, for example when the heating element is heated while not fully submerged in water, the or each heating element is typically associated with a thermostat arranged to cut off power to the heating element should the temperature of the heating element exceed safe levels. Where dual heating elements are provided, a separate thermostat is typically required for each heating element, resulting in increased cost and complexity.
  • DE19545155 and WO97/12182 are examples of known electrical heating devices.
  • Document DE19545155 discloses the preamble of claim 1.
  • According to the present invention there is provided an electrical heating device for heating water, said heating device comprising a plurality of heating elements operable to heat water stored within a vessel, wherein said plurality of heating elements are all arranged to be in thermal contact with a single thermostat adapted to cut of the supply of electrical power to said plurality of heating elements when the temperature of the thermostat exceeds a predetermined maximum temperature, indicating overheating of at least one of said heating elements, wherein the heating elements are mounted on a common support plate, said thermostat being mounted on said common support plate, at least a portion of each heating element remote from the ends of the heating element being in contact with the support plate adjacent the thermostat.
  • By placing all of the heating elements in thermal contact with a single thermostat, the need for a separate thermostat for each heating element is avoided, reducing the cost and complexity of the heating device.
  • Each heating element may comprise an elongate member having electrical connectors on opposite ends thereof, at least a portion of the elongate member of each heating element being in thermal contact with said thermostat.
  • Each electrical heating element may comprise an electrical resistance heating element disposed within an outer sheath and connected to the electrical connectors at opposite ends thereof. In one embodiment the outer sheath may comprise a stainless steel tube.
  • The support plate may define at least part of a wall of a vessel for containing water to be heated by the heating elements. Each heating element may pass through the support plate to define an elongate internal portion that extends into at least part of the vessel interior and an external portion provided with said electrical connectors for connecting the heating elements to a power supply.
  • Preferably the internal portion of each heating element extends in a loop. Preferably a portion of the loop of each heating element, preferably a distal end of the loop, engages the support plate at a common location, preferably spaced from or adjacent to said electrical connectors. Preferably all of the heating elements engage the support plate at said common location on said support plate, whereby the thermostat may be mounted on an outer side of the support plate adjacent said common location such that the thermostat is simultaneously in thermal contact with all of the heating elements.
  • In a preferred embodiment the heating device comprises two heating elements.
  • The internal portion of each heating element preferably comprises a first portion extending from the support plate in a direction substantially perpendicular to the support plate and a distal portion extending parallel to said first portion, towards said support plate, such that the heating element is effectively folded back on itself, whereby a looped end of the distal portion each heating element contacts the inner surface of the support plate to be in thermal contact with the thermostat.
  • Preferably the heating device comprises dual heating elements, a second heating element being arranged substantially parallel to and diagonally offset from a first heating element to be in nested or overlapping relationship therewith.
  • The thermostat may comprise material which undergoes physical changes in response to changes in the temperature. In response to this physical change, thermostat may open a switch that deactivates the heating elements. Alternatively the thermostat may comprise an electronic control unit and a temperature sensor that transmits signals to the control unit indicative of the temperature of the heating elements.
  • An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
    • Figure 1 is a plan view of an electrical heating device according to an embodiment of the present invention;
    • Figure 2 is an end view of the heating device of Figure 1; and
    • Figure 3 is a sectional view of the heating device of Figure 1 along line A-A.
  • A shown in the drawings, an electrical heating device 10 according to an embodiment of the present invention comprising dual heating elements 20,30 for heating water within a vessel, comprising a first heating element 20 and a second heating element 30 arranged substantially parallel to each other in nested or overlapping relationship, each heating element 20,30 being adapted to be in thermal contact with a single overheat prevention thermostat 40, as will be described below in more detail.
  • The heating elements 20,30 are mounted a common support plate 50, the support plate 50 being adapted to form part of the wall of a water vessel or tank for holding water to be heated.
  • Each heating element 20,30 comprises an elongate element comprising a stainless steel tubular outer sheath 100 having an electrical resistance heating wire 102 disposed therein. The ends of each heating element 20,30 extend through the support plate 50 and electrical connectors 104, 106, 108 are provided on the terminal ends thereof for connection to a power supply whereby each heating element 20,30 can be independently heated.
  • A first end of each heating element 20,30 is provided with a respective electrical connector 104,106 for connection to a respective positive terminal of a power source and a second end of each heating element 20,30 is connected to a common electrical connector 108 for connection to an earth point or negative terminal of the power supply.
  • Each heating element 20,30 extends from an inner surface of the support plate in a loop, each element having first and second sides extending from the respective ends of the heating element in parallel relationship the first and second sides being joined by a distal loop 60,70. Approximately half way along their length, the first and second sides of each heating element 20,30 are bent or folded through 180° such that the distal loop 60,70 thereof is located adjacent and vertically spaced from the terminal ends of the heating element 20,30, whereby the distal loops 60,70 are in contact with the inner surface of the support plate 50 at a location spaced from the terminal ends of the heating element.
  • The terminal ends of each heating element 20,30 extend through the support plate 50 at respective locations spaced from one another diagonally on the support plate 50 (see Figure 2) such that the heating elements 20,30 are arranged in nested or overlapping parallel relationship with the distal loops 60,70 of the heating element 20,30 being in contact with the inner face of the support plate 50 alongside one another at a common location. The thermostat 40 is mounted on the outer face of the support plate 50 adjacent said common location, whereby the thermostat 40 is in thermal contact with the distal loop 60,70 of both the first and second heating elements 20,30, through said common location on the support plate 50.
  • The distal loops 60,70 of the heating elements 20,30 may be joined to the support plate by brazing or welding to enhance thermal contact between the heating elements and the thermostat and to increase the strength of the heating device.
  • While a dual element heating device is described, it is envisaged that three or more heating elements may be provided, all in thermal communication with a single overheat prevention thermostat arranged to cut off power to the heating elements should one or more of the heating elements overheat.
  • The invention is not limited to the embodiment(s) described herein but can be amended or modified without departing from the scope of the present invention as defined in the appended claims.

Claims (14)

  1. An electrical heating device (10) for heating water, said heating device comprising a plurality of heating elements (20,30) operable to heat water stored within a vessel, wherein said plurality of heating elements (20,30) are all arranged to be in thermal contact with a single thermostat (40) adapted to cut of the supply of electrical power to said plurality of heating elements when the temperature of the thermostat exceeds a predetermined maximum temperature, indicating overheating of at least one of said heating elements, said plurality of heating elements (20,30) being mounted on a common support plate (50), said thermostat (40) being mounted on said common support plate (50), characterised in that at least a portion of each heating element (20,30) remote from the ends of the heating element is in contact with the support plate (50) adjacent the thermostat (40).
  2. An electrical heating device as claimed in claim 1, wherein each heating element (20,30) of said plurality of heating lements comprises an elongated member having electrical connectors (104,106,108) on opposite ends thereof, at least a portion of the elongate member of each heating element being in thermal contact with said thermostat (40).
  3. An electrical heating element as claimed in claim 2, wherein each of said heating elements (20,30) comprises an electrical resistance heating element disposed within an outer sheath and connected to the electrical connectors (104,106,108) at opposite ends thereof.
  4. An electrical heating device as claimed in claim 3, wherein said outer sheath of each heating element (20,30) comprises a stainless steel tube.
  5. An electrical heating device as claimed in any preceding claim, wherein the support plate (50) defines at least part of a wall of a vessel for containing water to be heated by the heating elements (20, 30).
  6. An electrical heating device as claimed in claim 5, wherein each heating element (20,30) passes through the support plate (50) to define an elongated internal portion that extends into at least part of the vessel interior and an external portion provided with said electrical connectors for connecting the heating elements (20,30) to a power supply.
  7. An electrical heating device as claimed in any preceding claim, wherein the internal portion of each heating element extends in a loop (60,70), wherein a portion of the loop (60,70) of each heating element (20,30) engages the support plate (50) at a common location adjacent the thermostat (40).
  8. An electrical heating device as claimed in claim 7, wherein said portion of the loop (60,70) of each heating element (20,30) engaging the support plate (50) comprises a distal end thereof.
  9. An electrical heating element as claimed in any preceding claim, wherein an internal portion of each heating element (20,30) comprises a first portion extending from the support plate in a direction substantially perpendicular to the support plate and a distal portion extending parallel to said first portion, towards said support plate, such that the heating element is effectively folded back on itself, whereby a looped end (60,70) of the distal portion of each heating element contacts x the inner surface of the support plate (50) to be in thermal contact with the thermostat (40).
  10. An electrical heating device as claimed in claim 9, wherein the heating device comprises dual heating elements (20,30), a second heating element (30) being arranged substantially parallel to and diagonally offset from a first heating element (20) to be in nested or overlapping relationship therewith.
  11. An electrical heating device as claimed in any preceding claim, wherein the thermostat (40) comprises a material which undergoes physical changes in response to changes in the temperature.
  12. An electrical heating device as claimed in claim 11, wherein the thermostat (40) opens a switch that deactivates the heating elements (20,30) in response to such physical change.
  13. An electrical heating device as claimed in any of claims 1 to 10, wherein the thermostat (40) comprises an electronic control unit and a temperature sensor that transmits signals to the control unit indicative of the temperature of the heating elements (20,30).
  14. An electrical heating device as claimed in any preceding claim comprising two heating elements (20,30) to provide two heat settings.
EP10705275.5A 2009-02-16 2010-02-09 Electrical heating device Active EP2438364B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0902533.9A GB0902533D0 (en) 2009-02-16 2009-02-16 Electrical heating device
PCT/EP2010/000786 WO2010091836A2 (en) 2009-02-16 2010-02-09 Electrical heating device

Publications (2)

Publication Number Publication Date
EP2438364A2 EP2438364A2 (en) 2012-04-11
EP2438364B1 true EP2438364B1 (en) 2014-01-08

Family

ID=40548246

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10705275.5A Active EP2438364B1 (en) 2009-02-16 2010-02-09 Electrical heating device

Country Status (5)

Country Link
EP (1) EP2438364B1 (en)
AU (1) AU2010213125B2 (en)
GB (1) GB0902533D0 (en)
NZ (1) NZ595169A (en)
WO (1) WO2010091836A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4510777A4 (en) * 2022-04-14 2026-04-29 Niterra Co Ltd LIQUID HEATING DEVICE

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATA225694A (en) * 1994-12-05 2001-01-15 Glanz Gerhard HEATER CARTRIDGE
AUPN560795A0 (en) * 1995-09-25 1995-10-19 Stokes (Australasia) Limited Heating element assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4510777A4 (en) * 2022-04-14 2026-04-29 Niterra Co Ltd LIQUID HEATING DEVICE

Also Published As

Publication number Publication date
WO2010091836A2 (en) 2010-08-19
WO2010091836A3 (en) 2012-03-01
NZ595169A (en) 2014-02-28
EP2438364A2 (en) 2012-04-11
AU2010213125A1 (en) 2011-10-13
GB0902533D0 (en) 2009-04-01
AU2010213125B2 (en) 2016-02-04

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