EP0328309A1 - Wassererhitzer - Google Patents

Wassererhitzer Download PDF

Info

Publication number
EP0328309A1
EP0328309A1 EP89301040A EP89301040A EP0328309A1 EP 0328309 A1 EP0328309 A1 EP 0328309A1 EP 89301040 A EP89301040 A EP 89301040A EP 89301040 A EP89301040 A EP 89301040A EP 0328309 A1 EP0328309 A1 EP 0328309A1
Authority
EP
European Patent Office
Prior art keywords
water
gas
valve
heat exchanger
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.)
Withdrawn
Application number
EP89301040A
Other languages
English (en)
French (fr)
Inventor
Anthony Lawrence Alfred Pompe
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.)
Cannon Industries Ltd
Original Assignee
Cannon Industries 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 Cannon Industries Ltd filed Critical Cannon Industries Ltd
Publication of EP0328309A1 publication Critical patent/EP0328309A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • 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
    • F24H15/212—Temperature of the water
    • F24H15/219—Temperature of the water after heating
    • 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
    • F24H15/238—Flow rate
    • 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
    • F24H15/242—Pressure
    • 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
    • F24H15/305—Control of valves
    • F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
    • 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
    • F24H15/335—Control of pumps, e.g. on-off control
    • 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
    • F24H15/36—Control of heat-generating means in heaters of burners

Definitions

  • This invention relates to water heaters fuelled by gas.
  • a water heater comprises a heat exchanger into which water is arranged to be fed from an inlet pipe, a gas burner capable of heating the heat exchanger, a gas pipe capable of supplying gas to said burner, a valve adapted to control the supply of gas through said pipe and monitoring means capable of detecting a predetermined value of the flow rate of water into said inlet pipe and causing said valve to be closed when the flow rate lies below said predetermined value.
  • the valve is preferably an electrically operated valve, such as a solenoid valve, and the monitoring means in such a case is conveniently a flow switch operative to interrupt the electrical supply to the valve and cause it to be closed when the flow rate of water does not reach or falls below the predetermined value.
  • the flow switch is conveniently of the paddle type.
  • Such a heater can function at very low operating water pressures (less than 35 g/cm2).
  • the solenoid valve also has in series with it, and with the flow switch, a further switch arranged to close when a tap controlling the flow of water through the heat exchanger is opened.
  • This switch may be a microswitch operated directly by the operation of the tap, or a pressure switch mounted on the water supply pipe.
  • the burner will turn off when the flow of water falls below the minimum value, ensuring a continued flow of cold water through the heat exchanger for a short while after the burner flames have been extinguished.
  • a thermostat is preferably also fitted to the outlet from the heat exchanger and is operative to cause the gas valve to close if the outlet water temperature exceeds a predetermined maximum.
  • a low temperature fused link is arranged to cause the gas supply to the heater to be cut off should the temperature of the water heater become unacceptably high.
  • the water may be fed to the heat exchanger from an external supply, or may be pumped from an associated reservoir tank by means of an electrically driven pump.
  • a In a typical heat exchanger (a) 5 litres of water per minute are heated through 30°C. The heat input is 11.13 kW. The heat exchanger is heated by a gas burner (b). A permanent pilot (c) for the burner (b) is lit from a piezo ignitor (d), the piezo ignitor being built into and operated by a gas control tap (e). Flame safety protection is provided by a thermocouple (f), operating in conjunction with a thermo-magnetic valve (g) within the body of the gas control tap (e).
  • the gas supply to the burner (b) is controlled by a gas solenoid valve (h).
  • a hot water tap (i) controls the water supply passing through the heat exchanger (a).
  • a switch is connected in series with the solenoid of the valve (h) and in the case of a low pressure system this may take the form of a microswitch within the head of the tap (i) or alternatively, in the case of higher pressure systems it may be a pressure switch in the water supply pipe, the switch contacts in either case being arranged to close when the tap (i) is opened.
  • water is supplied to the heat exchanger (a) from a reservoir (r) by means of a pump, this being energised directly by closure of the microswitch or pressure switch as the case may be.
  • the solenoid valve is not opened initially by closure of the switch, as the solenoid has in series with it a further switch (j) in the form of a flow switch fitted to the water inlet supply pipe and arranged to close at a minimum water flow rate of 1.2 litres per minute.
  • This system permits a flow of cold water through the heat exchanger before the gas burner is activated, both before and after ignition, eliminating the risk of high water temperatures.
  • a high limit thermostat (k) is also fitted to the pipe on the outlet side of the heat exchanger and is operative to cut off the current to the solenoid valve (h) and cause the latter to close if the outlet water temperature reaches a predetermined high temperature.
  • the whole assembly is enclosed in a suitable metal outer case with a single flue outlet.
  • the water inlet supply pipe may have an adjustable flow control tap or restrictor for high water pressure use. This is in the form of a simple restrictor orifice which is adjustable in two basic positions and is attached to the inlet hose connector in place of a submersible pump. With the pump leads disconnected, the alternative inlet pipe is connected to the inlet of the flow control valve (j).
  • the gas control tap has four positions: 'Off' 'Ignition/pilot' only, 'Full-on' and 'Shower'.
  • the control tap On igniting the pilot burner (b), the control tap is turned to either 'Full-open' or 'Shower' as required.
  • the heated water temperature may be varied from 30°C to 70°C by adjusting the water flow rate.
  • the high limit thermostat (k) closes off the gas, and the water pump remains operative until the tap is closed, thereby cooling down the water temperature.
  • the water temperature can rise to up to 90°C which is generally considered too high.
  • the heated water temperatures are dependent on the input cold water temperature.
  • a low temperature fused link (l) is fitted to the side of the heat exchanger.
  • the fused link is formed of a material which will melt before the solder connections within the water heater are damaged, and will interrupt the electrical supply from the thermocouple interrupter resulting in the shutting off of the gas supply to the heater.
  • the water heater is suitable for attachment to a common flue duct system, such as that claimed in a co-pending patent application.
  • the heater is designed for mobile caravans using butane or propane gas, it could also be used as a domestic natural gas water heater.
  • the water heater would be provided with a room-sealed outer casing, providing an air intake and flue outlet to outside air.

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)
  • Fluid Mechanics (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Resistance Heating (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Cookers (AREA)
EP89301040A 1988-02-10 1989-02-03 Wassererhitzer Withdrawn EP0328309A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8803047 1988-02-10
GB888803047A GB8803047D0 (en) 1988-02-10 1988-02-10 Water heaters

Publications (1)

Publication Number Publication Date
EP0328309A1 true EP0328309A1 (de) 1989-08-16

Family

ID=10631441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89301040A Withdrawn EP0328309A1 (de) 1988-02-10 1989-02-03 Wassererhitzer

Country Status (7)

Country Link
EP (1) EP0328309A1 (de)
JP (1) JPH01247951A (de)
AU (1) AU2953789A (de)
DK (1) DK49589A (de)
FI (1) FI890632A (de)
GB (2) GB8803047D0 (de)
NO (1) NO890555L (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2171137A1 (es) * 2000-12-05 2002-08-16 Puzol Ind S A Dispositivo de control y funcionamiento de calentadores de gas a baja tension.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE531309A (de) *
CH376630A (de) * 1958-11-13 1964-04-15 Radiation Ltd Gasbeheizter Wassererhitzer
FR2415269A1 (fr) * 1978-01-20 1979-08-17 Leblanc Sa E L M Perfectionnements apportes aux generateurs de calories fonctionnant au gaz, notamment aux chauffe-eau
JPS59158932A (ja) * 1983-03-02 1984-09-08 Matsushita Electric Ind Co Ltd 冷房付ヒ−トポンプ給湯装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH501880A (fr) * 1968-09-02 1971-01-15 Henri Tauzin Jean Chauffe-eau instantané à chauffage au mazout
GB1285545A (en) * 1970-07-07 1972-08-16 Raypak Thermonics Canada Ltd A fluid heater
US3806026A (en) * 1973-03-26 1974-04-23 U Trotter Control means for liquid heater
GB1507995A (en) * 1976-06-25 1978-04-19 British Gas Corp Gas-fired instantaneous water heaters for domestic supply and central heating

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE531309A (de) *
CH376630A (de) * 1958-11-13 1964-04-15 Radiation Ltd Gasbeheizter Wassererhitzer
FR2415269A1 (fr) * 1978-01-20 1979-08-17 Leblanc Sa E L M Perfectionnements apportes aux generateurs de calories fonctionnant au gaz, notamment aux chauffe-eau
JPS59158932A (ja) * 1983-03-02 1984-09-08 Matsushita Electric Ind Co Ltd 冷房付ヒ−トポンプ給湯装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 11 (M-351)[1734], 18th January 1985, page 31 M 351; & JP-A-59 158 932 (MATSUSHITA DENKI SANGYO K.K.) 08-09-1984 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2171137A1 (es) * 2000-12-05 2002-08-16 Puzol Ind S A Dispositivo de control y funcionamiento de calentadores de gas a baja tension.

Also Published As

Publication number Publication date
GB8803047D0 (en) 1988-03-09
GB8902403D0 (en) 1989-03-22
DK49589A (da) 1989-08-11
DK49589D0 (da) 1989-02-02
NO890555L (no) 1989-08-11
GB2215824A (en) 1989-09-27
FI890632A (fi) 1989-08-11
AU2953789A (en) 1989-08-10
JPH01247951A (ja) 1989-10-03
FI890632A0 (fi) 1989-02-09
NO890555D0 (no) 1989-02-09

Similar Documents

Publication Publication Date Title
US5020721A (en) Rapid recovery gas hot water heater
EP0039579B1 (de) Heizvorrichtung
US4204833A (en) Safety control for furnace burner
US8276548B2 (en) Low cost tankless portable water heater
US4373897A (en) Open draft hood furnace control using induced draft blower and exhaust stack flow rate sensing
US5322216A (en) System and method for controlling outlet water temperature of an instantaneous water heater
US4436506A (en) Control system for a gas heated water or air heater
US4171771A (en) Central heating systems
US5092519A (en) Control system for water heaters
US3681566A (en) Heating system for asphalt equipment
US6981650B2 (en) Pool/spa heater
EP0328309A1 (de) Wassererhitzer
US10428972B2 (en) Water heater gas valve
US3989188A (en) Fuel control system and method of operating the same and diverter valve therefor
JP2001235144A (ja) 燃焼装置
US4206874A (en) Heating
US9618205B2 (en) Gas flow controller for use in gas fired apparatus
EP0275568A1 (de) Gas-gefeuerte Warmwassereinrichtung und mit einem Luftversorgungsventilator und einer Gas/Luft modulierenden Steuerung ausgerüstet
US2806455A (en) Apparatus for preventing overheating of a hot water boiler
EP0240390B1 (de) Gasbrennersicherheitsvorrichtung vom mechanisch kontrollierbaren Belüftungstyp
US4060192A (en) Fuel control system and method of operating the same and diverter valve therefor
US3905747A (en) Fuel control system and method of operating the same
JPS6144110Y2 (de)
JP2003194357A (ja) 給湯器用湯水混合ユニット
JPH08210700A (ja) 給湯器

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19900219