EP0967841A2 - Portable microwave drying apparatus - Google Patents
Portable microwave drying apparatus Download PDFInfo
- Publication number
- EP0967841A2 EP0967841A2 EP99660105A EP99660105A EP0967841A2 EP 0967841 A2 EP0967841 A2 EP 0967841A2 EP 99660105 A EP99660105 A EP 99660105A EP 99660105 A EP99660105 A EP 99660105A EP 0967841 A2 EP0967841 A2 EP 0967841A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- application chamber
- housing
- partition
- wave tube
- set forth
- 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.)
- Granted
Links
Images
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
- H05B6/6402—Aspects relating to the microwave cavity
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/70—Drying or keeping dry, e.g. by air vents
- E04B1/7007—Drying or keeping dry, e.g. by air vents by using electricity, e.g. electro-osmosis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/003—Small self-contained devices, e.g. portable
-
- 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
- H05B6/76—Prevention of microwave leakage, e.g. door sealings
-
- 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
-
- 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
Definitions
- the present invention relates to a portable drying apparatus for drying structures by means of microwaves, said apparatus comprising a housing divided by a partition into two compartments, the first compartment thereof housing a magnetron and the second compartment constituting an application chamber for radiation, which is confined by said partition and metal side walls on five flanks, the sixth flank being permeable to radiation for the transmission of radiated power from the application chamber to a structure to be dried.
- This type of drying apparatus is disclosed in the Applicant's patent publication EP 555,257.
- An object of the invention is to provide a cost-efficient drying apparatus, wherein the matching of power transmission and uniformity of field are improved while avoiding the reflection of energy back to the magnetron.
- a substantially cubic-shaped housing 1 is made of metal sheets and the housing dimensions can be e.g. 40 cm x 40 cm x 40 cm.
- the housing is divided by a partition 13 into two compartments, the first housing a magnetron 4 functioning as a radiation-generating power source and the second compartment constituting an application chamber 2, functioning as a radiation transmission antenna and confined by the partition 13 and metal side walls 3 on five flanks.
- the application chamber 2 has a sixth flank which is permeable to radiation for the transmission of radiated power from the chamber 2 to a structure to be dried.
- the apparatus employs a conventional technical unit of a home microwave oven, comprising the magnetron 4 provided with a drive circuit, an operating switch 5, and a wave tube 7.
- the housing element of a home microwave oven or at least part of its housing element is removed in order to fit the unit as a power source in the housing 1.
- the magnetron-fitted power source 4 is positioned in such a way that a transmission aperture 8 of the wave tube 7 coincides with an aperture present in the partition 13.
- the application chamber 2 is provided with a metal reflector cone, supported by a dielectric plate 10 and having its apex pointing towards the transmission aperture 8 of the wave tube 7.
- a plane wave propagating directly down from the aperture 8 reflects from the surface of a cone 9 by way of the walls of the application chamber 2 downwards in a more uniformly distributed fashion.
- the dielectric plate 10, placed at a proper height and having a proper thickness, contributes to a uniform distribution of the field and at the same time constitutes a support for the cone 9.
- the plate 10 is distanced from a plane defined by the edges of the open flank of the chamber 2 by a spacing S which is within the range of 60 -100 mm.
- the plate 10 has a thickness which is e.g.
- the plate thickness is e.g. about 20 mm, if the microwave has a frequency of 2,4 GHz.
- the reflector cone 9 has a base diameter of e.g. 100 mm and a height of about 100 mm, as well.
- the cone 9 can be adapted to be vertically movable, if it is desirable to further enhance the uniformity of field.
- the described arrangement is also effective in eliminating the hazardous situation, wherein the power is not able to get out of the chamber 2 e.g. to a dry wall structure but, instead, endeavours to work its way back to the magnetron by way of the wave tube 7. Such a path for back reflection does not exist and, hence, a possible back reflection remains highly insignificant.
- the wall of the wave tube 7 opposite to a radiation source 6 of the magnetron is set an angle of either 90° or 45° relative to the partition 13. Tests have indicated that good results are obtained with both wall directions. Furthermore, in view of diminishing back reflection and providing a more uniform field, it is beneficial that between the radiation source 6 and the application chamber 2 be fitted a wall of the wave tube 7 for blocking the transmission of radiated power from the radiation source 6 directly into the application chamber 2 and vice versa.
- the application chamber 2 has the edges of its open flank fitted with microswitches 11, which operate as limit switches and which both must be pressed in before the magnetron 4 starts up. This makes sure that radiation cannot be accidentally directed out of the apparatus until the apparatus is set against a surface to be dried, which is capable of absorbing radiation energy.
- the housing 1 has two opposite walls 3 thereof provided with sliding wall sections 12 which, in an extended condition, constitute triangular extensions for the stationary box walls 3.
- the application chamber 2 can be fitted tightly against a corner defined by walls or by a wall and a floor.
- the housing 1 is further provided with a handle 14 for carrying the apparatus along.
- An apparatus of the invention can be used for drying, directly from the surface of a structure without damaging the structures, e.g. extemal and partition walls of buildings, pillars, balconies, sub-floors, underground passages, floors, basement structures, and roofs in new construction as well as at renovation sites. For example, wet and damaged bathroom wall and floor coverings are removed. Wet floats and cements are dressed and milled down to the neat concrete or brick surface, followed by drying the wall and floor structures by means of an apparatus of the invention. This speeds up renovation work.
- structures e.g. extemal and partition walls of buildings, pillars, balconies, sub-floors, underground passages, floors, basement structures, and roofs in new construction as well as at renovation sites.
- wet and damaged bathroom wall and floor coverings are removed.
- Wet floats and cements are dressed and milled down to the neat concrete or brick surface, followed by drying the wall and floor structures by means of an apparatus of the invention. This speeds up renovation work.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Microbiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Health & Medical Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Water Supply & Treatment (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
- The present invention relates to a portable drying apparatus for drying structures by means of microwaves, said apparatus comprising a housing divided by a partition into two compartments, the first compartment thereof housing a magnetron and the second compartment constituting an application chamber for radiation, which is confined by said partition and metal side walls on five flanks, the sixth flank being permeable to radiation for the transmission of radiated power from the application chamber to a structure to be dried. This type of drying apparatus is disclosed in the Applicant's patent publication EP 555,257.
- An object of the invention is to provide a cost-efficient drying apparatus, wherein the matching of power transmission and uniformity of field are improved while avoiding the reflection of energy back to the magnetron.
- This object is achieved on the basis of the characterizing features set forth in the appended
claim 1. The non-independent claims disclose preferred embodiments of the invention for optimizing the fulfilment of the above objective. - One exemplary embodiment of the invention will now be described in more detail with reference made to the accompanying drawing, which shows a drying apparatus of the invention in a lateral view and partially cut away as far as an
application chamber 2 is concemed. - A substantially cubic-
shaped housing 1 is made of metal sheets and the housing dimensions can be e.g. 40 cm x 40 cm x 40 cm. The housing is divided by apartition 13 into two compartments, the first housing amagnetron 4 functioning as a radiation-generating power source and the second compartment constituting anapplication chamber 2, functioning as a radiation transmission antenna and confined by thepartition 13 andmetal side walls 3 on five flanks. Theapplication chamber 2 has a sixth flank which is permeable to radiation for the transmission of radiated power from thechamber 2 to a structure to be dried. - As its power source, the apparatus employs a conventional technical unit of a home microwave oven, comprising the
magnetron 4 provided with a drive circuit, anoperating switch 5, and awave tube 7. The housing element of a home microwave oven or at least part of its housing element is removed in order to fit the unit as a power source in thehousing 1. The magnetron-fittedpower source 4 is positioned in such a way that atransmission aperture 8 of thewave tube 7 coincides with an aperture present in thepartition 13. - The
application chamber 2 is provided with a metal reflector cone, supported by adielectric plate 10 and having its apex pointing towards thetransmission aperture 8 of thewave tube 7. A plane wave propagating directly down from theaperture 8 reflects from the surface of a cone 9 by way of the walls of theapplication chamber 2 downwards in a more uniformly distributed fashion. Thedielectric plate 10, placed at a proper height and having a proper thickness, contributes to a uniform distribution of the field and at the same time constitutes a support for the cone 9. Preferably, theplate 10 is distanced from a plane defined by the edges of the open flank of thechamber 2 by a spacing S which is within the range of 60 -100 mm. Theplate 10 has a thickness which is e.g. about 114 of the length of an applied wave as the wave propagates in a dielectric material constituting theplate 10. The plate thickness is e.g. about 20 mm, if the microwave has a frequency of 2,4 GHz. The reflector cone 9 has a base diameter of e.g. 100 mm and a height of about 100 mm, as well. The cone 9 can be adapted to be vertically movable, if it is desirable to further enhance the uniformity of field. - The described arrangement is also effective in eliminating the hazardous situation, wherein the power is not able to get out of the
chamber 2 e.g. to a dry wall structure but, instead, endeavours to work its way back to the magnetron by way of thewave tube 7. Such a path for back reflection does not exist and, hence, a possible back reflection remains highly insignificant. - The wall of the
wave tube 7 opposite to aradiation source 6 of the magnetron is set an angle of either 90° or 45° relative to thepartition 13. Tests have indicated that good results are obtained with both wall directions. Furthermore, in view of diminishing back reflection and providing a more uniform field, it is beneficial that between theradiation source 6 and theapplication chamber 2 be fitted a wall of thewave tube 7 for blocking the transmission of radiated power from theradiation source 6 directly into theapplication chamber 2 and vice versa. - The
application chamber 2 has the edges of its open flank fitted withmicroswitches 11, which operate as limit switches and which both must be pressed in before themagnetron 4 starts up. This makes sure that radiation cannot be accidentally directed out of the apparatus until the apparatus is set against a surface to be dried, which is capable of absorbing radiation energy. - The
housing 1 has twoopposite walls 3 thereof provided withsliding wall sections 12 which, in an extended condition, constitute triangular extensions for thestationary box walls 3. When thewalls 12 are in an extended condition, theapplication chamber 2 can be fitted tightly against a corner defined by walls or by a wall and a floor. - The
housing 1 is further provided with ahandle 14 for carrying the apparatus along. - An apparatus of the invention can be used for drying, directly from the surface of a structure without damaging the structures, e.g. extemal and partition walls of buildings, pillars, balconies, sub-floors, underground passages, floors, basement structures, and roofs in new construction as well as at renovation sites. For example, wet and damaged bathroom wall and floor coverings are removed. Wet floats and cements are dressed and milled down to the neat concrete or brick surface, followed by drying the wall and floor structures by means of an apparatus of the invention. This speeds up renovation work.
Claims (7)
- A portable drying apparatus for drying structures by means of microwaves, said apparatus comprising a housing (1) divided by a partition (13) into two compartments, the first compartment thereof housing a magnetron (4) and the second compartment constituting an application chamber (2) for radiation, which is confined by said partition (13) and metal side walls (3) on five flanks, the sixth flank being permeable to radiation for the transmission of radiated power from the application chamber (2) to a structure to be dried, characterized in that the magnetron (4), along with a drive circuit, an operating switch (5), and a wave tube (7) therefor, is picked up from a home microwave oven and positioned in such a way that a transmission aperture (8) of the wave tube (7) coincides with an aperture present in the partition (13), and that the application chamber (2) houses a metal reflector cone (9), supported by a dielectric plate (10) and having its apex pointing towards the transmission aperture (8) of the wave tube (7).
- An apparatus as set forth in claim 1, characterized in that the dielectric plate (10) is distanced by a spacing (S) of 60-100 mm from a plane defined by edges (11) of the open flank of the application chamber (2).
- An apparatus as set forth in claim 1 or 2, characterized in that the housing (1) has dimensions which in centimeters are about 40x40x40, and that the partition (13) divides the housing into substantially equal compartments.
- An apparatus as set forth in any of claims 1-3, characterized in that the dielectric plate (10) has a thickness which is about 1/4 of the length of an applied wave as the wave propagates in a dielectric material constituting said plate.
- An apparatus as set forth in any of claims 1-4, characterized in that the wall of the wave tube (7) located opposite to a radiation source (6) of the magnetron (4) is positioned at an angle of either 90° or 45° relative to the partition (13).
- An apparatus as set forth in any of claims 1-5, characterized in that between the radiation source (6) and the application chamber (2) is a wall of the wave tube (7) for blocking the transmission of radiated power from the radiation source (6) directly into the application chamber (2).
- An apparatus as set forth in any of claims 1-6, characterized in that the housing (1) has two opposite walls (3) thereof provided with sliding wall sections (12) which, in an extended condition, constitute triangular extensions for the stationary box walls (3) for fitting the application chamber (2) tightly against a comer defined by structures to be dried, such as walls or a wall and a floor.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI981463 | 1998-06-25 | ||
FI981463A FI103917B1 (en) | 1998-06-25 | 1998-06-25 | Portable microwave dryer |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0967841A2 true EP0967841A2 (en) | 1999-12-29 |
EP0967841A3 EP0967841A3 (en) | 2000-05-03 |
EP0967841B1 EP0967841B1 (en) | 2006-09-13 |
Family
ID=8552071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99660105A Expired - Lifetime EP0967841B1 (en) | 1998-06-25 | 1999-06-08 | Portable microwave drying apparatus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0967841B1 (en) |
AT (1) | ATE339870T1 (en) |
DE (1) | DE69933170T2 (en) |
FI (1) | FI103917B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2812166A1 (en) * | 2000-07-21 | 2002-01-25 | Commissariat Energie Atomique | Microwave guide and applicator includes two reflector surfaces bringing microwaves to focus to crumble and erode concrete surface |
EP1196010A1 (en) * | 1999-05-28 | 2002-04-10 | Shunichi Yagi | Heating apparatus and method of heating objects |
FR2832022A1 (en) * | 2001-11-06 | 2003-05-09 | Christian Lincot | High frequency electromagnetic wave generator includes magnetron in container with cooling system and waveguide for application to target |
WO2005079116A2 (en) * | 2004-02-11 | 2005-08-25 | Micro Heat Limited | Mehod and apparatus for heating a fluidic load using radio frequency energy |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0555257A1 (en) | 1990-11-05 | 1993-08-18 | Miraku Oy | Drying procedure and apparatus. |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1082801A (en) * | 1977-03-08 | 1980-07-29 | Michael A. Hamid | Fog clearing by microwave power |
DK86888A (en) * | 1988-02-19 | 1989-08-20 | Winterthur Borgen A S | PROCEDURE FOR TREATING BUILDING CONSTRUCTIONS INFECTED WITH HARMFUL ORGANISMS TO DAMAGE THEM |
-
1998
- 1998-06-25 FI FI981463A patent/FI103917B1/en not_active IP Right Cessation
-
1999
- 1999-06-08 AT AT99660105T patent/ATE339870T1/en active
- 1999-06-08 DE DE69933170T patent/DE69933170T2/en not_active Expired - Lifetime
- 1999-06-08 EP EP99660105A patent/EP0967841B1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0555257A1 (en) | 1990-11-05 | 1993-08-18 | Miraku Oy | Drying procedure and apparatus. |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1196010A1 (en) * | 1999-05-28 | 2002-04-10 | Shunichi Yagi | Heating apparatus and method of heating objects |
FR2812166A1 (en) * | 2000-07-21 | 2002-01-25 | Commissariat Energie Atomique | Microwave guide and applicator includes two reflector surfaces bringing microwaves to focus to crumble and erode concrete surface |
WO2002009477A1 (en) * | 2000-07-21 | 2002-01-31 | Commissariat A L'energie Atomique | Focusing microwave applicator |
US6583395B2 (en) | 2000-07-21 | 2003-06-24 | Commissariat A L'energie Atomique | Focusing microwave applicator |
FR2832022A1 (en) * | 2001-11-06 | 2003-05-09 | Christian Lincot | High frequency electromagnetic wave generator includes magnetron in container with cooling system and waveguide for application to target |
WO2005079116A2 (en) * | 2004-02-11 | 2005-08-25 | Micro Heat Limited | Mehod and apparatus for heating a fluidic load using radio frequency energy |
WO2005079116A3 (en) * | 2004-02-11 | 2005-10-27 | Micro Heat Ltd | Mehod and apparatus for heating a fluidic load using radio frequency energy |
Also Published As
Publication number | Publication date |
---|---|
EP0967841B1 (en) | 2006-09-13 |
FI981463A (en) | 1999-10-15 |
DE69933170D1 (en) | 2006-10-26 |
ATE339870T1 (en) | 2006-10-15 |
FI103917B (en) | 1999-10-15 |
FI103917B1 (en) | 1999-10-15 |
FI981463A0 (en) | 1998-06-25 |
DE69933170T2 (en) | 2007-09-06 |
EP0967841A3 (en) | 2000-05-03 |
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