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WO1992006572A1 - Appareil de chauffage electromagnetique - Google Patents

Appareil de chauffage electromagnetique Download PDF

Info

Publication number
WO1992006572A1
WO1992006572A1 PCT/GB1991/001719 GB9101719W WO9206572A1 WO 1992006572 A1 WO1992006572 A1 WO 1992006572A1 GB 9101719 W GB9101719 W GB 9101719W WO 9206572 A1 WO9206572 A1 WO 9206572A1
Authority
WO
WIPO (PCT)
Prior art keywords
electromagnetic
bed
heating apparatus
heating
electromagnetic heating
Prior art date
Application number
PCT/GB1991/001719
Other languages
English (en)
Inventor
Steven Thomas Gribby
Original Assignee
Steven Thomas Gribby
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 Steven Thomas Gribby filed Critical Steven Thomas Gribby
Publication of WO1992006572A1 publication Critical patent/WO1992006572A1/fr

Links

Classifications

    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/80—Apparatus for specific applications
    • H05B6/802—Apparatus for specific applications for heating fluids
    • H05B6/804—Water heaters, water boilers
    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves

Definitions

  • This invention relates to apparatus for heating a liquid (which will almost invariably comprise water) by means of electromagnetic energy, usually (but not exclusively) by means of microwave energy.
  • Known water heating devices generate heat by combustion of a fuel such as gas or oil, or from electrical energy. Electrical heating has the advantage that it is clean and can be made readily available in most locations.
  • US 3 816 689 discloses liquid heating apparatus which utilises microwave energy.
  • the liquid to be heated passes through a large coil embedded in a matrix which absorbs the microwave energy.
  • GB 1 585 356 it is proposed to pass the liquid to be heated through tubing arranged in the form of a parabola, and microwave energy is emitted at the focus of the parabola.
  • both of these proposals are considered to be relatively inefficient, they would take up a considerable amount of space, and they would also be costly to manufacture.
  • An object of the present invention may be viewed as being to provide inexpensive microwave heating apparatus which is capable of operating at improved efficiency.
  • the present invention proposes electromagnetic heating apparatus which is distinguished by the fact that the liquid is heated in bed which contains the liquid in a sheet-like layer.
  • the bed may be curved but is preferably substantially flat to reduce the volume of the apparatus and for ease of manufacture.
  • the bed may include internal dividing walls which increase the length of the flow path through the bed.
  • the means of generating the electromagnetic energy will usually comprise a microwave energy generating device such as a magnetron.
  • FIG. 1 is a diagrammatic sectional view of microwave water heating apparatus of the invention
  • Figure 2 is a side view of the heating bed which is at the heart of the apparatus, the lower half of the bed being sectioned on line II-II of Fig. 4,
  • Figure 3 is an end view of the heating bed
  • Figure 4 is a plan view of one of the two mouldings which form the bed.
  • the device includes a housing 1 which is internally divided to form a compartment 2 and a separate heating chamber 3.
  • the heating chamber 3 has steel-lined walls to internally reflect microwave energy and is provided with water inlet and outlet connections 4 and 5 respectively.
  • the heating chamber also contains a flat heating bed 6 which is coupled to the inlet 4 and outlet 5 and is supported in a substantially horizontal position by brackets or other suitable means (not shown) .
  • the compartment 2 contains three magnetrons 10, 11 and 12 which generate microwave energy.
  • the microwave region of the electromagnetic spectrum extends from about 400 to 20,000 MHz, but frequencies around 2,450 MHz are preferred since energy in this region is well absorbed by water and is also reflected by steel.
  • the microwave energy emitted by the magnetrons 10 - 12 is conducted to the heating chamber 3 via respective waveguides 14, 15 and 16 which terminate above the heating bed 6 .
  • the heating bed is shown in more detail in Fig.s 2 to 4 and comprises a pair of substantially identical polypropylene top and bottom mouldings 18 and 19 measuring about 450mm by 250mm.
  • Each moulding comprises a substantially flat and rectangular top/bottom wall 20 surrounded by a short peripheral side wall 21, and includes an integral tubular connector 22, 23 which form inlet and outlet connections to the bed.
  • each connector 22, 23 is offset in two directions from the central axis A of the bed.
  • the two mouldings are heat welded together around the free edges of the side walls 21 to form a thin flat enclosed space of about 5mm in thickness.
  • each moulding includes an arrangement of internal dividing walls 26 which project from the top/bottom wall 20.
  • the dividing walls 26 are symmetrical about the central axis A so that when the two mouldings are joined together the dividing walls meet to divide the internal space of the bed into an elongate flow path extending between the two connectors 22 and 23.
  • the inlet and outlet couplings 4 and 5 conduct water to and from the heating bed 6 via the respective connectors 22 and 23.
  • a temperature sensor 28 (Fig. 1) is mounted on the outlet coupling 5, and this sensor is arranged to switch off one or more of the magnetrons 10 - 12 when the temperature of water flowing through the outlet coupling exceeds a predetermined operating temperature. Thus, once a working temperature has been attained the power consumption of the apparatus is automatically reduced.
  • the mouldings 18 and 19 do not appreciably absorb, and are not heated by, microwave energy.
  • the microwave energy emitted by the magnetrons 10 - 12 and fed to the chamber 3 via the waveguides 14 - 16 causes water flowing through the bed 6 to be heated.
  • Tests have shown that the use of a flat bed of the kind described produces more efficient heating of water than other configurations of bed.
  • the bed described is also lightweight, inexpensive to manufacture, and can also result in a relatively compact form of water heater.
  • magnetron only one magnetron may be necessary in some applications. In other applications a greater number of magnetrons may be required.
  • the bed 6 could be of various shapes other than those shown, e.g. circular, whilst still maintaining a thin bed.
  • the bed may also be formed entirely of glass or a combination of glass and plastics, in one or more pieces.
  • the device may be used as an in-line water heater for supplying hot water to a shower head or a tap for example.
  • the device may also be suitable for use as a "boiler" for a central heating system of the kind in which water is recirculated through a number of radiator devices by a pumped or gravity feed arrangement.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

Appareil comprenant un boîtier (1) comportant des raccordements d'orifices d'entrée et de sortie de l'eau (4 et 5) reliés à un lit chauffant (6) monté dans ledit boîtier. Ce lit (6) est formé d'une paire de moulages plastiques identiques qui sont soudés ensemble à chaud et qui définissent une voie d'écoulement plate semblable à une feuille. Des magnétrons (10-12) sont disposés de manière à chauffer par micro-ondes l'eau passant à travers le lit (6).
PCT/GB1991/001719 1990-10-05 1991-10-04 Appareil de chauffage electromagnetique WO1992006572A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909021707A GB9021707D0 (en) 1990-10-05 1990-10-05 Water heaters
GB9021707.6 1990-10-05

Publications (1)

Publication Number Publication Date
WO1992006572A1 true WO1992006572A1 (fr) 1992-04-16

Family

ID=10683302

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001719 WO1992006572A1 (fr) 1990-10-05 1991-10-04 Appareil de chauffage electromagnetique

Country Status (3)

Country Link
AU (1) AU8636091A (fr)
GB (1) GB9021707D0 (fr)
WO (1) WO1992006572A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994002422A1 (fr) * 1992-07-27 1994-02-03 Forskningscenter Risø Procede et appareil pour modifier l'eau ou une substance liquide contenant de l'eau
DE10005375B4 (de) * 2000-02-07 2005-03-17 Reinhard Ehnle Heizen mit Mikrowelle, Takt und Boilersystem
WO2025078987A1 (fr) * 2023-10-12 2025-04-17 Tu.Ro.Co Srl Dispositif compact de chauffage de fluides

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236056A (en) * 1979-01-29 1980-11-25 Allen Donald D Microwave heater
GB2076619A (en) * 1980-05-23 1981-12-02 Jung Gmbh Microwave apparatus for heating circulable media
US4310738A (en) * 1980-02-08 1982-01-12 Michael Moretti Microwave fluid heating system
US4310739A (en) * 1980-05-19 1982-01-12 Hatem John P Fluid heater powered by microwave energy
US4313798A (en) * 1980-06-17 1982-02-02 Lakehurst Galleries, Ltd. Micro-wave powered distillation unit
FR2531190A1 (fr) * 1982-07-29 1984-02-03 Lajat Herve Chaudiere de chauffage central a micro-ondes avec possibilite de production d'eau chaude
DE3706336C1 (de) * 1987-02-27 1988-04-28 Linn Horst Verfahren und Vorrichtung zur Erzeugung hoher Temperaturen
US4874915A (en) * 1988-12-30 1989-10-17 Lifeblood Advanced Blood Bank Systems, Inc. Apparatus for the rapid microwave thawing of cryopreserved blood, blood components, and tissue
US4956534A (en) * 1988-04-29 1990-09-11 Martin William A Inverted frustum shaped microwave heat exchanger and applications thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4236056A (en) * 1979-01-29 1980-11-25 Allen Donald D Microwave heater
US4310738A (en) * 1980-02-08 1982-01-12 Michael Moretti Microwave fluid heating system
US4310739A (en) * 1980-05-19 1982-01-12 Hatem John P Fluid heater powered by microwave energy
GB2076619A (en) * 1980-05-23 1981-12-02 Jung Gmbh Microwave apparatus for heating circulable media
US4313798A (en) * 1980-06-17 1982-02-02 Lakehurst Galleries, Ltd. Micro-wave powered distillation unit
FR2531190A1 (fr) * 1982-07-29 1984-02-03 Lajat Herve Chaudiere de chauffage central a micro-ondes avec possibilite de production d'eau chaude
DE3706336C1 (de) * 1987-02-27 1988-04-28 Linn Horst Verfahren und Vorrichtung zur Erzeugung hoher Temperaturen
US4956534A (en) * 1988-04-29 1990-09-11 Martin William A Inverted frustum shaped microwave heat exchanger and applications thereof
US4874915A (en) * 1988-12-30 1989-10-17 Lifeblood Advanced Blood Bank Systems, Inc. Apparatus for the rapid microwave thawing of cryopreserved blood, blood components, and tissue

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994002422A1 (fr) * 1992-07-27 1994-02-03 Forskningscenter Risø Procede et appareil pour modifier l'eau ou une substance liquide contenant de l'eau
DE10005375B4 (de) * 2000-02-07 2005-03-17 Reinhard Ehnle Heizen mit Mikrowelle, Takt und Boilersystem
WO2025078987A1 (fr) * 2023-10-12 2025-04-17 Tu.Ro.Co Srl Dispositif compact de chauffage de fluides

Also Published As

Publication number Publication date
GB9021707D0 (en) 1990-11-21
AU8636091A (en) 1992-04-28

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