CA1190605A - Modular industrial microwave furnace - Google Patents
Modular industrial microwave furnaceInfo
- Publication number
- CA1190605A CA1190605A CA000406026A CA406026A CA1190605A CA 1190605 A CA1190605 A CA 1190605A CA 000406026 A CA000406026 A CA 000406026A CA 406026 A CA406026 A CA 406026A CA 1190605 A CA1190605 A CA 1190605A
- Authority
- CA
- Canada
- Prior art keywords
- microwave
- compartment
- generators
- section
- applicator
- 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
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
- H05B6/78—Arrangements for continuous movement of material
-
- 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
- H05B2206/00—Aspects relating to heating by electric, magnetic, or electromagnetic fields covered by group H05B6/00
- H05B2206/04—Heating using microwaves
- H05B2206/046—Microwave drying of wood, ink, food, ceramic, sintering of ceramic, clothes, hair
Abstract
ABSTRACT OF THE DISCLOSURE:
There is provided an industrial microwave furnace comprising a metal casing subdivided into three adjacent compartments by partitions having each an opening in an upper part thereof. The two outer compartments each include a number of microwave generators and are each pressurized by a flow of cool air from an associated air fan. The micro-wave generators are disposed opposite the openings in the partitions such that warm air resulting from cooling of the microwave generators by the flow of cool air is directed through the openings into the middle compartment which forms a microwave applicator section. The industrial micro-wave furnace further comprises a plurality of waveguides arranged on the walls of the casing and a plurality of radiators for coupling the microwave energy from the micro-wave generators in the waveguides and for coupling the micro-wave energy from the waveguides into the middle applicator compartment. The radiators are evenly distributed along the waveguides so as to create a constant electric field over the cross-section of the middle applicator compartment, thereby to result in a constant heating over the cross-section of the middle applicator compartment and in a maximum microwave energy coupled into the middle applicator compartment.
There is provided an industrial microwave furnace comprising a metal casing subdivided into three adjacent compartments by partitions having each an opening in an upper part thereof. The two outer compartments each include a number of microwave generators and are each pressurized by a flow of cool air from an associated air fan. The micro-wave generators are disposed opposite the openings in the partitions such that warm air resulting from cooling of the microwave generators by the flow of cool air is directed through the openings into the middle compartment which forms a microwave applicator section. The industrial micro-wave furnace further comprises a plurality of waveguides arranged on the walls of the casing and a plurality of radiators for coupling the microwave energy from the micro-wave generators in the waveguides and for coupling the micro-wave energy from the waveguides into the middle applicator compartment. The radiators are evenly distributed along the waveguides so as to create a constant electric field over the cross-section of the middle applicator compartment, thereby to result in a constant heating over the cross-section of the middle applicator compartment and in a maximum microwave energy coupled into the middle applicator compartment.
Description
The presen-t invention relates to a modular in-dustrial microwave furnace for the drying or thermal handl.-ing of products by microwave energy.
The microwave handli.ng of products is a].ready known. For that purpose an installation is currently used which comprises a microwave generator coupled -through an insulator and passive transfer means to a microwave appli-cator in which the product is handled. Such an installation has the following drawbacks:
a) it uses expensive high power generators which require to be protected by means of costly microwave cir-culators, b) the efficiency is usually very low due to the reflected microwave energy.
The object of the invention is to provide a microwave furnace which has the following advantages:
a) effici.ency as high as 30% starting from the energy distribution network, b) continuous and discontinuous operation, c) high accuracy and energy adjustment capability d) modular construc-tion, e) low cost construction.
The above ob~ect is realized in accordance with the present invention by an industrial microwave furnace comprising:
a metal casing subdivided into three adjacent compartments by partitions having each an opening in an upper part thereof, these three compartments including two outer compartments and a middle compartment, the two outer compartments each including a number of microwave genera-tors and being pressurized by a flow of cool air from associated air fan means, the microwave generators being arranged opposite the openings in the partitions such that warm air resulting from cooling of the microwave generators by the flow of cool air is di.rected through the openings " ~
:~ , into the middle compartment which forms a microwave appli cator sec-tlon, a p],urality of waveguide means arranyed on -the walls of the casing;
a plurali.ty of radiator means for coupling -the microwave energy :Erom the microwave generators into the waveguide means and for coupling the microwave energy from the waveguide means into the middle applicator compartment, -the radiator means being evenly distribu-ted along the wave-guide means so as to create a constant electric field over the cross-section of the middle applicator compartment, thereby to result in a constant heating over the cross-section of the middle appll.cator compartment and in a maximum microwave energy being coupled into the middle applicator compartment.
The microwave generators included in the two outer compartments may comprise for example 25 to 50 low-power magnetrons.
The construction according to the invention which includes the microwave generator and applicator in one sole unit, not only enable to use low cost power units but also to avoid the need for costly passive transfer means such as circulators which result in a substantial lowering in efficiency. Further, the modular structure according to the invention makes it possible to sui-t most of the industrial energy utilities in the range from ten to several hundreds of kilowatts.
Other features of the invention will become apparent from the following description of a preEerred embodiment thereof, made with reference -to -the accompanying drawings in which:
Figure 1 schematically illustrates a usual micro-wave installation of the prior art;
Figure 2 is a perspective view of an embodiment of a microwave furnace module according to the invention, 3~i Figure 3 is a schematic sectional view in the embodiment of Figure 2 and is disposed on -the same sheet of drawings as Figure 1.
Reference is Eirst made to Figure 1 which exemplifies a prior art industrial microwave installation.
The numeral reEerence 1 denotes the microwave generator which is coupled through an insulator 2 and passive trans-fer means such as circulators 3 to the microwave applica-tor 4 ln which is placed the product to be handled.
By contrast with this prior art installa-tion, the invention provides a modular unit as exemplified in Figures
The microwave handli.ng of products is a].ready known. For that purpose an installation is currently used which comprises a microwave generator coupled -through an insulator and passive transfer means to a microwave appli-cator in which the product is handled. Such an installation has the following drawbacks:
a) it uses expensive high power generators which require to be protected by means of costly microwave cir-culators, b) the efficiency is usually very low due to the reflected microwave energy.
The object of the invention is to provide a microwave furnace which has the following advantages:
a) effici.ency as high as 30% starting from the energy distribution network, b) continuous and discontinuous operation, c) high accuracy and energy adjustment capability d) modular construc-tion, e) low cost construction.
The above ob~ect is realized in accordance with the present invention by an industrial microwave furnace comprising:
a metal casing subdivided into three adjacent compartments by partitions having each an opening in an upper part thereof, these three compartments including two outer compartments and a middle compartment, the two outer compartments each including a number of microwave genera-tors and being pressurized by a flow of cool air from associated air fan means, the microwave generators being arranged opposite the openings in the partitions such that warm air resulting from cooling of the microwave generators by the flow of cool air is di.rected through the openings " ~
:~ , into the middle compartment which forms a microwave appli cator sec-tlon, a p],urality of waveguide means arranyed on -the walls of the casing;
a plurali.ty of radiator means for coupling -the microwave energy :Erom the microwave generators into the waveguide means and for coupling the microwave energy from the waveguide means into the middle applicator compartment, -the radiator means being evenly distribu-ted along the wave-guide means so as to create a constant electric field over the cross-section of the middle applicator compartment, thereby to result in a constant heating over the cross-section of the middle appll.cator compartment and in a maximum microwave energy being coupled into the middle applicator compartment.
The microwave generators included in the two outer compartments may comprise for example 25 to 50 low-power magnetrons.
The construction according to the invention which includes the microwave generator and applicator in one sole unit, not only enable to use low cost power units but also to avoid the need for costly passive transfer means such as circulators which result in a substantial lowering in efficiency. Further, the modular structure according to the invention makes it possible to sui-t most of the industrial energy utilities in the range from ten to several hundreds of kilowatts.
Other features of the invention will become apparent from the following description of a preEerred embodiment thereof, made with reference -to -the accompanying drawings in which:
Figure 1 schematically illustrates a usual micro-wave installation of the prior art;
Figure 2 is a perspective view of an embodiment of a microwave furnace module according to the invention, 3~i Figure 3 is a schematic sectional view in the embodiment of Figure 2 and is disposed on -the same sheet of drawings as Figure 1.
Reference is Eirst made to Figure 1 which exemplifies a prior art industrial microwave installation.
The numeral reEerence 1 denotes the microwave generator which is coupled through an insulator 2 and passive trans-fer means such as circulators 3 to the microwave applica-tor 4 ln which is placed the product to be handled.
By contrast with this prior art installa-tion, the invention provides a modular unit as exemplified in Figures
2 and 3. The UIlit 10 is comprised of a metal casing 1 sub-divided into three compartment 11, 12 and 13 by partitions 14 and 15. The outer compartments 11 and 13 house the power unit.s including a number of microwave generators or magne-trons 4 and the supply transformers 8; the middle compart-ment 12 constitutes the very applicator in which the produc-t is handled.
The partitions 14 and 15 between the compartments have openings 16 and 17 respectively. The magnetrons 4 are arranged relative to the openings 16 and 17 such that the warm air resulting from the cooling of the magnetrons directly flows into the applicator compartrnent 12. The openings 16 and 17 are each provided with a grating 18.
On top of the casing 1 are mounted a number of waveguides 2. The microwave energy from the magnetrons is coupled into the compartment 12 by means o microwave radiator means 3 which are evenly distributed along each waveguide 2. The position of the waveguides 2 and the radia-tors 3 is chosen such that the coupling between the magne-trons is negligible. In this way, not only the provision or insulators and circulators is avoided, but also the efficiency is significantly increased. The position and dis-tribution oE the radiators 3 over the middle compartment 12 are determined in such a way that the interaction between the magne-trons is prac-tically avoided. By way of example, a prac-tical design of a 36 kW microwave furnace ~18 X 2 magne-trons of lkW) operating at a frequency of 2~50 MHz and intended for drying plastified paper comprises seventy-two radiators distribwted in eighteen rows of four radiators with -the rows spaced apart by approximately twenty-five centimeters and the radiators in each row spaced apart by approximately fifteen centimeters.
The outer compartments 11 and 13 are pressurized under variable pressure by separate air fans 9. Thereby the heat from the cooling of the magnetrons as well as that o the transformers is used in the compartment 12. The exhaust occurs through outlets 5.
In the illustrated embodiments there is shown a transport belt 6 made of a flexible and non-absorbing material, e.y. polyethylen, which runs through the compar-t-ment 12 for the transportation of the product to be handled.
A continuous operation is thereby ensured.
The modular structure as described hereabove makes it possible installations of any power capability to be realized by simply putting the desired number of module units according to the invention in adjacent relation.
_ ~ _
The partitions 14 and 15 between the compartments have openings 16 and 17 respectively. The magnetrons 4 are arranged relative to the openings 16 and 17 such that the warm air resulting from the cooling of the magnetrons directly flows into the applicator compartrnent 12. The openings 16 and 17 are each provided with a grating 18.
On top of the casing 1 are mounted a number of waveguides 2. The microwave energy from the magnetrons is coupled into the compartment 12 by means o microwave radiator means 3 which are evenly distributed along each waveguide 2. The position of the waveguides 2 and the radia-tors 3 is chosen such that the coupling between the magne-trons is negligible. In this way, not only the provision or insulators and circulators is avoided, but also the efficiency is significantly increased. The position and dis-tribution oE the radiators 3 over the middle compartment 12 are determined in such a way that the interaction between the magne-trons is prac-tically avoided. By way of example, a prac-tical design of a 36 kW microwave furnace ~18 X 2 magne-trons of lkW) operating at a frequency of 2~50 MHz and intended for drying plastified paper comprises seventy-two radiators distribwted in eighteen rows of four radiators with -the rows spaced apart by approximately twenty-five centimeters and the radiators in each row spaced apart by approximately fifteen centimeters.
The outer compartments 11 and 13 are pressurized under variable pressure by separate air fans 9. Thereby the heat from the cooling of the magnetrons as well as that o the transformers is used in the compartment 12. The exhaust occurs through outlets 5.
In the illustrated embodiments there is shown a transport belt 6 made of a flexible and non-absorbing material, e.y. polyethylen, which runs through the compar-t-ment 12 for the transportation of the product to be handled.
A continuous operation is thereby ensured.
The modular structure as described hereabove makes it possible installations of any power capability to be realized by simply putting the desired number of module units according to the invention in adjacent relation.
_ ~ _
Claims (2)
1. An industrial microwave furnace comprising:
a metal casing subdivided into three adjacent compartments by partitions having each an opening in an upper part thereof, said three compartments including two outer compartments and a middle compartment, the two outer compartments each including a number of microwave genera-tors and being pressurized by a flow of cool air from associated air fan means, said microwave generators being arranged opposite said openings in the partitions such that warm air resulting from cooling of the microwave generators by said flow of cool air is directed through said openings into the middle compartment which forms a microwave appli-cator section;
a plurality of waveguide means arranged on the walls of the casing;
a plurality of radiator means for coupling the microwave energy from said microwave generators into the waveguide means and for coupling the microwave energy from said waveguide means into the middle applicator compartment, said radiator means being evenly distributed along the waveguide means so as to create a constant electric field over the cross-section of the middle applicator compartment, thereby to result in a constant heating over the cross-section of said middle applicator compartment and in a maximum microwave energy being coupled into the middle applicator compartment.
a metal casing subdivided into three adjacent compartments by partitions having each an opening in an upper part thereof, said three compartments including two outer compartments and a middle compartment, the two outer compartments each including a number of microwave genera-tors and being pressurized by a flow of cool air from associated air fan means, said microwave generators being arranged opposite said openings in the partitions such that warm air resulting from cooling of the microwave generators by said flow of cool air is directed through said openings into the middle compartment which forms a microwave appli-cator section;
a plurality of waveguide means arranged on the walls of the casing;
a plurality of radiator means for coupling the microwave energy from said microwave generators into the waveguide means and for coupling the microwave energy from said waveguide means into the middle applicator compartment, said radiator means being evenly distributed along the waveguide means so as to create a constant electric field over the cross-section of the middle applicator compartment, thereby to result in a constant heating over the cross-section of said middle applicator compartment and in a maximum microwave energy being coupled into the middle applicator compartment.
2. A microwave furnace as claimed in claim 1, further comprising at least one transport belt arranged for running through the middle compartment for transportation of a product to be handled.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8103118A NL8103118A (en) | 1981-06-29 | 1981-06-29 | MODULAR INDUSTRIAL MICROWAVE OVEN FOR THERMAL TREATMENT OF SUBSTANCES. |
| NL8103118 | 1981-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1190605A true CA1190605A (en) | 1985-07-16 |
Family
ID=19837709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000406026A Expired CA1190605A (en) | 1981-06-29 | 1982-06-25 | Modular industrial microwave furnace |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0069105B1 (en) |
| AT (1) | ATE19334T1 (en) |
| CA (1) | CA1190605A (en) |
| DE (1) | DE3270591D1 (en) |
| ES (1) | ES8305176A1 (en) |
| GR (1) | GR75434B (en) |
| IE (1) | IE52949B1 (en) |
| NL (1) | NL8103118A (en) |
| PT (1) | PT75071B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5098665A (en) * | 1987-04-14 | 1992-03-24 | Helmut Katschnig | Device for heating of articles and organisms |
| US7547864B2 (en) | 2005-04-22 | 2009-06-16 | Premark Feg L.L.C. | Microwave oven having plural magnetrons with cooling air flow |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3926363A1 (en) * | 1989-08-10 | 1991-02-14 | Reinhard Schulze | METHOD AND DEVICE FOR THE HEAT TREATMENT OF MIXTURE ORGANIC SUBSTANCES AND RELATED APPLICATION |
| DE4001220A1 (en) * | 1990-01-17 | 1991-07-18 | Reinhard Schulze | Microwave chamber - has internal atmosphere regulated by through-flow device provided with inlet and outlet gas connections in walls of chamber |
| ES2342958B2 (en) * | 2008-09-03 | 2011-07-04 | Emite Ingenieria Slne | ANALYZER OF MULTIPLE INPUTS AND MULTIPLE OUTPUTS. |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3127495A (en) * | 1961-09-05 | 1964-03-31 | Studebaker Corp | Microwave oven |
| CH426051A (en) * | 1965-10-25 | 1966-12-15 | Patelhold Patentverwertung | Microwave treatment tunnel |
| FR2076405A5 (en) * | 1970-01-14 | 1971-10-15 | Materiel Telephonique | |
| US3654417A (en) * | 1970-10-30 | 1972-04-04 | Litton Precision Prod Inc | Microwave oven including air flow system |
| JPS52587B2 (en) * | 1972-04-11 | 1977-01-08 | ||
| FR2227230A1 (en) * | 1973-04-27 | 1974-11-22 | Mauviel Michel | Drying of sludge and town refuse - is effected by high frequency waves without incineration |
| FR2327700A1 (en) * | 1975-10-09 | 1977-05-06 | Meisel Nicolas | MICROWAVE TUNNEL OVEN FOR CONTINUOUS PROCESSING OF FOOD PRODUCTS |
| FR2428369A1 (en) * | 1978-06-08 | 1980-01-04 | Cim Lambda Int Sarl | Microwave heat treatment - maintaining excess pressure in resonator cavities against workpiece tunnel |
| GB2054330A (en) * | 1979-07-17 | 1981-02-11 | Unicorn Ind Ltd | Microwave heat treatment apparatus |
-
1981
- 1981-06-29 NL NL8103118A patent/NL8103118A/en not_active Application Discontinuation
-
1982
- 1982-06-17 PT PT75071A patent/PT75071B/en unknown
- 1982-06-18 DE DE8282870033T patent/DE3270591D1/en not_active Expired
- 1982-06-18 EP EP82870033A patent/EP0069105B1/en not_active Expired
- 1982-06-18 AT AT82870033T patent/ATE19334T1/en not_active IP Right Cessation
- 1982-06-23 GR GR68547A patent/GR75434B/el unknown
- 1982-06-25 CA CA000406026A patent/CA1190605A/en not_active Expired
- 1982-06-25 ES ES513491A patent/ES8305176A1/en not_active Expired
- 1982-06-28 IE IE1545/82A patent/IE52949B1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5098665A (en) * | 1987-04-14 | 1992-03-24 | Helmut Katschnig | Device for heating of articles and organisms |
| US7547864B2 (en) | 2005-04-22 | 2009-06-16 | Premark Feg L.L.C. | Microwave oven having plural magnetrons with cooling air flow |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3270591D1 (en) | 1986-05-22 |
| GR75434B (en) | 1984-07-17 |
| PT75071A (en) | 1982-07-01 |
| EP0069105B1 (en) | 1986-04-16 |
| IE52949B1 (en) | 1988-04-13 |
| IE821545L (en) | 1982-12-29 |
| ES513491A0 (en) | 1983-03-16 |
| ES8305176A1 (en) | 1983-03-16 |
| ATE19334T1 (en) | 1986-05-15 |
| EP0069105A1 (en) | 1983-01-05 |
| PT75071B (en) | 1984-01-04 |
| NL8103118A (en) | 1983-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |