EP0419512A1 - Induction heater - Google Patents
Induction heaterInfo
- Publication number
- EP0419512A1 EP0419512A1 EP19890906410 EP89906410A EP0419512A1 EP 0419512 A1 EP0419512 A1 EP 0419512A1 EP 19890906410 EP19890906410 EP 19890906410 EP 89906410 A EP89906410 A EP 89906410A EP 0419512 A1 EP0419512 A1 EP 0419512A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- chamber
- induction heater
- heating
- spiral
- 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.)
- Ceased
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
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
- H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
-
- 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
Definitions
- the induction heater 1 is adapted to be connected to a fluid conduit (not shown) via inlet and outlet ports 2 and 3. Further, the induction heater is adapted to be easily disconnected from the fluid conduit and the end plates 5 and 6 easily removable to allow access to the inside of the cylindrical section 4. Spiral support member 10 may also be easily removable to allow the retrieval and disposal of the spiral portion 8 of mesh during routine cleaning operations.
Abstract
Les pièces descriptives de la présente invention se rapportent à un four à induction (1) pour le chauffage de fluides, lequel comprend une chambre (4), constituée par exemple par un tube, à travers laquelle passe le fluide pendant l'utilisation, un enroulement primaire (7) enroulé autour de la chambre et un enroulement secondaire fermé (8) disposé à l'intérieur de la chambre et comportant une partie pour le chauffage du fluide présentant une configuration hélicoïdale. Un tel four à induction permet un chauffage uniforme du fluide.The descriptive parts of the present invention relate to an induction furnace (1) for heating fluids, which comprises a chamber (4), constituted for example by a tube, through which the fluid passes during use, a primary winding (7) wound around the chamber and a closed secondary winding (8) disposed inside the chamber and having a portion for heating the fluid having a helical configuration. Such an induction furnace allows uniform heating of the fluid.
Description
INDUCTION HEATER
The present invention relates to induction heaters and in particular to induction heaters adapted to heat fluids.
Induction heaters which comprise a primary winding wound around a pipe, the pipe itself acting as the secondary, suffer from the disadvantage that temperature distribution is uneven across the cross section of the fluid in the pipe. In particular, overheating of the fluid may occur in the static laminar boundary layer adjacent to the wall. This problem may be particularly severe for some fluids, for instance highly viscous fluids. In additon, fluids susceptible to shear thinning and multiphase materials may also suffer from such problems.
A known solution to overcoming the problem of uneven heat distribution exemplified by overheating at the boundary layer is to provide a static mixing element made up of an arrangement of angled blades. The blades result in transverse fluid flow being superimposed on the axial laminar flow and, consequently, provide for the continuous renewal of material in the boundary layer. Such blade mixing elements are not, however, utilised in induction heated arrangements but normally only in unheated conduits.
It is an object of the present invention to provide an induction heater which provides even heating of fluid.
In accordance with the present invention, an induction heater for heating fluid comprises a chamber, through which fluid passes in use, a primary winding wound around the chamber and a closed secondary arranged inside the chamber and having a
portion for heating the fluid configured as a spiral. Conventiently, the chamber may be cylindrical and the spiral substantially co-axial with the chamber and of a uniformly increasing curvature. By providing an internal heating element of such a shape, an induction heater is provided which both heats and mixes thus providing the even heating of the fluid.
In a preferred embodiment, the portion of the secondary is either a spiral wire or a sheet of expanded wire mesh. The flow of fluid across such a sheet is not axial laminer but instead comprises significant transverse components which provide for the continuous replacement of fluid in the boundary layer, adjacent to the chamber walls, as well as continuous radial mixing, throughout the cross-section of the pipe.
An embodiment of the invention will now be described with reference to the accompanying drawing which depicts an induction heater exemplifying the present invention.
Referring now to Figures 1 and 2, an induction heater, indicated generally at 1, comprises a cylindrical pipe section 4 defining a chamber closed by end plates 5 and 6. Fluid is fed into the cylindrical section 4 through an inlet port 2 in the end plate 4 and passes from the chamber via outlet port 3 in the end plate 6. The primary winding 7 of the induction heater is wound around the cylindrical section 4 and is connected to an appropriate power supply source (not shown) .
The secondary of the induction heater is arranged inside the chamber and comprises a spiral portion 8 of uniformly increasing curvature substantially co-axial with the cylindral section 4. A return portion 9 of the secondary connects
the outermost and innermost sections of the spiral portion 8 to render the secondary closed. The return portion 9 comprises a cylindrical rod, co-axial with the spiral portion, to which is connected the innermost section of spiral portion 8. A further section of the return portion is connected to the rod 12 and to the outermost section of spiral portion 8. The spiral portion 8 is supported in position in the chamber by a pair of support members 10 and 11 which each comprise a circular plate with a spiral channel into which the edge of the spiral portion 8 may be inserted. The spiral portion 8 of the secondary is preferably a sheet of expanded wire mesh. The structure of such a mesh disrupts the axial laminar flow of fluid and imparts transverse movement to the fluid. It will be appreciated that an appropriately positioned heating element configured as a spiral acts as a uniform heat source across substantially the whole diameter of the cylindrical section 4.
The induction heater 1 is adapted to be connected to a fluid conduit (not shown) via inlet and outlet ports 2 and 3. Further, the induction heater is adapted to be easily disconnected from the fluid conduit and the end plates 5 and 6 easily removable to allow access to the inside of the cylindrical section 4. Spiral support member 10 may also be easily removable to allow the retrieval and disposal of the spiral portion 8 of mesh during routine cleaning operations.
Claims
1. An induction heater for heating fluid comprising a chamber through which fluid passes in use, a primary winding wound around the chamber and a closed secondary arranged inside the chamber and having a portion for heating the fluid configured as a spiral.
2. An induction heater as claimed in Claim 1 wherein the chamber is cylindrical and the spiral portion of the secondary is substantially co-axial with the chamber and of a uniformly increasing curvature.
3. An induction heater as claimed in Claim 2 wherein the diameter of the spiral portion is sufficient to provide in use substantially even heating of the viscous fluid.
4. An induction heater as claimed in any preceding claim wherein the portion for heating the fluid is a spiral wire.
5. An induction heater as clained in any of preceding claims 1-3 wherein the portion for heating the fluid is a sheet of expanded wire mesh.
6. An induction heater as claimed in any preceding claim wherein the secondary is shaped to impart transverse flow to fluid passing through the chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8813437A GB2219715B (en) | 1988-06-07 | 1988-06-07 | Induction heater |
| GB8813437 | 1988-06-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0419512A1 true EP0419512A1 (en) | 1991-04-03 |
Family
ID=10638207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19890906410 Ceased EP0419512A1 (en) | 1988-06-07 | 1989-06-07 | Induction heater |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0419512A1 (en) |
| GB (1) | GB2219715B (en) |
| WO (1) | WO1989012204A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ233841A (en) * | 1990-05-29 | 1993-01-27 | Transflux Holdings Ltd | Continuous flow transformer water heater |
| WO1997034445A1 (en) * | 1996-03-15 | 1997-09-18 | Bbmr Limited | An inductive fluid heater |
| DE69837419T2 (en) * | 1997-06-11 | 2007-12-20 | Matsushita Electric Industrial Co., Ltd., Kadoma | Device for inductive heating of liquids |
| WO2005053826A2 (en) * | 2003-12-04 | 2005-06-16 | Ickinger Georg M | Method for heating static mixers |
| US8071914B2 (en) * | 2007-12-26 | 2011-12-06 | Noboru Oshima | Heating apparatus |
| DE102014105808A1 (en) * | 2014-04-24 | 2015-10-29 | Olympus Winter & Ibe Gmbh | Device for heating a liquid to be supplied to the human body |
| CN105444141B (en) * | 2014-09-19 | 2019-08-06 | 特电株式会社 | Fluid heater |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503305A (en) * | 1979-12-17 | 1985-03-05 | Virgin George C | Electromagnetic induction air heater |
| SE442696B (en) * | 1981-09-24 | 1986-01-20 | Asea Ab | DEVICE FOR HEATING OF GAS OR LIQUID MEDIA |
-
1988
- 1988-06-07 GB GB8813437A patent/GB2219715B/en not_active Expired - Fee Related
-
1989
- 1989-06-07 EP EP19890906410 patent/EP0419512A1/en not_active Ceased
- 1989-06-07 WO PCT/GB1989/000629 patent/WO1989012204A1/en not_active Application Discontinuation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8912204A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2219715A (en) | 1989-12-13 |
| GB2219715B (en) | 1992-05-06 |
| GB8813437D0 (en) | 1988-07-13 |
| WO1989012204A1 (en) | 1989-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0610897B1 (en) | Heat exchanging apparatus | |
| FI90730B (en) | Apparatus for the preparation of putty and the like | |
| US6205292B1 (en) | Fluid heater | |
| US5400432A (en) | Apparatus for heating or cooling of fluid including heating or cooling elements in a pair of counterflow fluid flow passages | |
| EP0419512A1 (en) | Induction heater | |
| US2582134A (en) | Indirect heater for fluids | |
| US7190894B2 (en) | Energy efficient electric water heater system that provides immediate hot water at a point of use and a method therefor | |
| US4122801A (en) | Waste energy hot water heater | |
| US3127200A (en) | Sayag | |
| US4191648A (en) | Filtration device for filtering temperature controlled fluids | |
| US2814279A (en) | Dual water heating systems | |
| US11892198B2 (en) | Hot water tank and flow through heating assembly | |
| US2737374A (en) | Fluid cooled injection heater | |
| US20040131346A1 (en) | Energy efficient electric water heater system that provides immediate hot water at a point of use and a method therefor | |
| US4387766A (en) | Hot oil heater with helical coil baffle | |
| US2299197A (en) | Catalytic unit | |
| US3622748A (en) | Electric heating system for asphalt equipment | |
| US2861169A (en) | Electric water heater | |
| US2683592A (en) | Heated conduit system | |
| NL9101227A (en) | DEVICE FOR HEATING A SUBSTANCE IN FLOW. | |
| NL1001915C2 (en) | Expansion vessel. | |
| US2245332A (en) | Water heater | |
| US2287181A (en) | Water heater | |
| EP3358271A1 (en) | Water heater and a pipe coil for a heat exchanger, in particular an exchanger intended for that specific water heater | |
| US453855A (en) | Water-heater for stoves |
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 |
|
| 17P | Request for examination filed |
Effective date: 19901205 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| 17Q | First examination report despatched |
Effective date: 19920122 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: EASTERN ELECTRICITY PLC |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
| 18R | Application refused |
Effective date: 19930308 |